fs/ocfs2/xattr.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * xattr.c
   5  *
   6  * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
   7  *
   8  * CREDITS:
   9  * Lots of code in this file is copy from linux/fs/ext3/xattr.c.
  10  * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public
  14  * License version 2 as published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  */
  21
  22 #include <linux/capability.h>
  23 #include <linux/fs.h>
  24 #include <linux/types.h>
  25 #include <linux/slab.h>
  26 #include <linux/highmem.h>
  27 #include <linux/pagemap.h>
  28 #include <linux/uio.h>
  29 #include <linux/sched.h>
  30 #include <linux/splice.h>
  31 #include <linux/mount.h>
  32 #include <linux/writeback.h>
  33 #include <linux/falloc.h>
  34 #include <linux/sort.h>
  35 #include <linux/init.h>
  36 #include <linux/module.h>
  37 #include <linux/string.h>
  38 #include <linux/security.h>
  39
  40 #include <cluster/masklog.h>
  41
  42 #include "ocfs2.h"
  43 #include "alloc.h"
  44 #include "blockcheck.h"
  45 #include "dlmglue.h"
  46 #include "file.h"
  47 #include "symlink.h"
  48 #include "sysfile.h"
  49 #include "inode.h"
  50 #include "journal.h"
  51 #include "ocfs2_fs.h"
  52 #include "suballoc.h"
  53 #include "uptodate.h"
  54 #include "buffer_head_io.h"
  55 #include "super.h"
  56 #include "xattr.h"
  57 #include "refcounttree.h"
  58 #include "acl.h"
  59 #include "ocfs2_trace.h"
  60
  61 struct ocfs2_xattr_def_value_root {
  62         struct ocfs2_xattr_value_root   xv;
  63         struct ocfs2_extent_rec         er;
  64 };
  65
  66 struct ocfs2_xattr_bucket {
  67         /* The inode these xattrs are associated with */
  68         struct inode *bu_inode;
  69
  70         /* The actual buffers that make up the bucket */
  71         struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
  72
  73         /* How many blocks make up one bucket for this filesystem */
  74         int bu_blocks;
  75 };
  76
  77 struct ocfs2_xattr_set_ctxt {
  78         handle_t *handle;
  79         struct ocfs2_alloc_context *meta_ac;
  80         struct ocfs2_alloc_context *data_ac;
  81         struct ocfs2_cached_dealloc_ctxt dealloc;
  82         int set_abort;
  83 };
  84
  85 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
  86 #define OCFS2_XATTR_INLINE_SIZE 80
  87 #define OCFS2_XATTR_HEADER_GAP  4
  88 #define OCFS2_XATTR_FREE_IN_IBODY       (OCFS2_MIN_XATTR_INLINE_SIZE \
  89                                          - sizeof(struct ocfs2_xattr_header) \
  90                                          - OCFS2_XATTR_HEADER_GAP)
  91 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr)  ((ptr)->i_sb->s_blocksize \
  92                                          - sizeof(struct ocfs2_xattr_block) \
  93                                          - sizeof(struct ocfs2_xattr_header) \
  94                                          - OCFS2_XATTR_HEADER_GAP)
  95
  96 static struct ocfs2_xattr_def_value_root def_xv = {
  97         .xv.xr_list.l_count = cpu_to_le16(1),
  98 };
  99
 100 const struct xattr_handler *ocfs2_xattr_handlers[] = {
 101         &ocfs2_xattr_user_handler,
 102         &ocfs2_xattr_acl_access_handler,
 103         &ocfs2_xattr_acl_default_handler,
 104         &ocfs2_xattr_trusted_handler,
 105         &ocfs2_xattr_security_handler,
 106         NULL
 107 };
 108
 109 static const struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
 110         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
 111         [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
 112                                         = &ocfs2_xattr_acl_access_handler,
 113         [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
 114                                         = &ocfs2_xattr_acl_default_handler,
 115         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
 116         [OCFS2_XATTR_INDEX_SECURITY]    = &ocfs2_xattr_security_handler,
 117 };
 118
 119 struct ocfs2_xattr_info {
 120         int             xi_name_index;
 121         const char      *xi_name;
 122         int             xi_name_len;
 123         const void      *xi_value;
 124         size_t          xi_value_len;
 125 };
 126
 127 struct ocfs2_xattr_search {
 128         struct buffer_head *inode_bh;
 129         /*
 130          * xattr_bh point to the block buffer head which has extended attribute
 131          * when extended attribute in inode, xattr_bh is equal to inode_bh.
 132          */
 133         struct buffer_head *xattr_bh;
 134         struct ocfs2_xattr_header *header;
 135         struct ocfs2_xattr_bucket *bucket;
 136         void *base;
 137         void *end;
 138         struct ocfs2_xattr_entry *here;
 139         int not_found;
 140 };
 141
 142 /* Operations on struct ocfs2_xa_entry */
 143 struct ocfs2_xa_loc;
 144 struct ocfs2_xa_loc_operations {
 145         /*
 146          * Journal functions
 147          */
 148         int (*xlo_journal_access)(handle_t *handle, struct ocfs2_xa_loc *loc,
 149                                   int type);
 150         void (*xlo_journal_dirty)(handle_t *handle, struct ocfs2_xa_loc *loc);
 151
 152         /*
 153          * Return a pointer to the appropriate buffer in loc->xl_storage
 154          * at the given offset from loc->xl_header.
 155          */
 156         void *(*xlo_offset_pointer)(struct ocfs2_xa_loc *loc, int offset);
 157
 158         /* Can we reuse the existing entry for the new value? */
 159         int (*xlo_can_reuse)(struct ocfs2_xa_loc *loc,
 160                              struct ocfs2_xattr_info *xi);
 161
 162         /* How much space is needed for the new value? */
 163         int (*xlo_check_space)(struct ocfs2_xa_loc *loc,
 164                                struct ocfs2_xattr_info *xi);
 165
 166         /*
 167          * Return the offset of the first name+value pair.  This is
 168          * the start of our downward-filling free space.
 169          */
 170         int (*xlo_get_free_start)(struct ocfs2_xa_loc *loc);
 171
 172         /*
 173          * Remove the name+value at this location.  Do whatever is
 174          * appropriate with the remaining name+value pairs.
 175          */
 176         void (*xlo_wipe_namevalue)(struct ocfs2_xa_loc *loc);
 177
 178         /* Fill xl_entry with a new entry */
 179         void (*xlo_add_entry)(struct ocfs2_xa_loc *loc, u32 name_hash);
 180
 181         /* Add name+value storage to an entry */
 182         void (*xlo_add_namevalue)(struct ocfs2_xa_loc *loc, int size);
 183
 184         /*
 185          * Initialize the value buf's access and bh fields for this entry.
 186          * ocfs2_xa_fill_value_buf() will handle the xv pointer.
 187          */
 188         void (*xlo_fill_value_buf)(struct ocfs2_xa_loc *loc,
 189                                    struct ocfs2_xattr_value_buf *vb);
 190 };
 191
 192 /*
 193  * Describes an xattr entry location.  This is a memory structure
 194  * tracking the on-disk structure.
 195  */
 196 struct ocfs2_xa_loc {
 197         /* This xattr belongs to this inode */
 198         struct inode *xl_inode;
 199
 200         /* The ocfs2_xattr_header inside the on-disk storage. Not NULL. */
 201         struct ocfs2_xattr_header *xl_header;
 202
 203         /* Bytes from xl_header to the end of the storage */
 204         int xl_size;
 205
 206         /*
 207          * The ocfs2_xattr_entry this location describes.  If this is
 208          * NULL, this location describes the on-disk structure where it
 209          * would have been.
 210          */
 211         struct ocfs2_xattr_entry *xl_entry;
 212
 213         /*
 214          * Internal housekeeping
 215          */
 216
 217         /* Buffer(s) containing this entry */
 218         void *xl_storage;
 219
 220         /* Operations on the storage backing this location */
 221         const struct ocfs2_xa_loc_operations *xl_ops;
 222 };
 223
 224 /*
 225  * Convenience functions to calculate how much space is needed for a
 226  * given name+value pair
 227  */
 228 static int namevalue_size(int name_len, uint64_t value_len)
 229 {
 230         if (value_len > OCFS2_XATTR_INLINE_SIZE)
 231                 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
 232         else
 233                 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
 234 }
 235
 236 static int namevalue_size_xi(struct ocfs2_xattr_info *xi)
 237 {
 238         return namevalue_size(xi->xi_name_len, xi->xi_value_len);
 239 }
 240
 241 static int namevalue_size_xe(struct ocfs2_xattr_entry *xe)
 242 {
 243         u64 value_len = le64_to_cpu(xe->xe_value_size);
 244
 245         BUG_ON((value_len > OCFS2_XATTR_INLINE_SIZE) &&
 246                ocfs2_xattr_is_local(xe));
 247         return namevalue_size(xe->xe_name_len, value_len);
 248 }
 249
 250
 251 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
 252                                              struct ocfs2_xattr_header *xh,
 253                                              int index,
 254                                              int *block_off,
 255                                              int *new_offset);
 256
 257 static int ocfs2_xattr_block_find(struct inode *inode,
 258                                   int name_index,
 259                                   const char *name,
 260                                   struct ocfs2_xattr_search *xs);
 261 static int ocfs2_xattr_index_block_find(struct inode *inode,
 262                                         struct buffer_head *root_bh,
 263                                         int name_index,
 264                                         const char *name,
 265                                         struct ocfs2_xattr_search *xs);
 266
 267 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
 268                                         struct buffer_head *blk_bh,
 269                                         char *buffer,
 270                                         size_t buffer_size);
 271
 272 static int ocfs2_xattr_create_index_block(struct inode *inode,
 273                                           struct ocfs2_xattr_search *xs,
 274                                           struct ocfs2_xattr_set_ctxt *ctxt);
 275
 276 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
 277                                              struct ocfs2_xattr_info *xi,
 278                                              struct ocfs2_xattr_search *xs,
 279                                              struct ocfs2_xattr_set_ctxt *ctxt);
 280
 281 typedef int (xattr_tree_rec_func)(struct inode *inode,
 282                                   struct buffer_head *root_bh,
 283                                   u64 blkno, u32 cpos, u32 len, void *para);
 284 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
 285                                            struct buffer_head *root_bh,
 286                                            xattr_tree_rec_func *rec_func,
 287                                            void *para);
 288 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
 289                                         struct ocfs2_xattr_bucket *bucket,
 290                                         void *para);
 291 static int ocfs2_rm_xattr_cluster(struct inode *inode,
 292                                   struct buffer_head *root_bh,
 293                                   u64 blkno,
 294                                   u32 cpos,
 295                                   u32 len,
 296                                   void *para);
 297
 298 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
 299                                   u64 src_blk, u64 last_blk, u64 to_blk,
 300                                   unsigned int start_bucket,
 301                                   u32 *first_hash);
 302 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
 303                                         struct ocfs2_dinode *di,
 304                                         struct ocfs2_xattr_info *xi,
 305                                         struct ocfs2_xattr_search *xis,
 306                                         struct ocfs2_xattr_search *xbs,
 307                                         struct ocfs2_refcount_tree **ref_tree,
 308                                         int *meta_need,
 309                                         int *credits);
 310 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
 311                                            struct ocfs2_xattr_bucket *bucket,
 312                                            int offset,
 313                                            struct ocfs2_xattr_value_root **xv,
 314                                            struct buffer_head **bh);
 315
 316 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
 317 {
 318         return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
 319 }
 320
 321 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
 322 {
 323         return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
 324 }
 325
 326 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
 327 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
 328 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
 329
 330 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
 331 {
 332         struct ocfs2_xattr_bucket *bucket;
 333         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
 334
 335         BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
 336
 337         bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
 338         if (bucket) {
 339                 bucket->bu_inode = inode;
 340                 bucket->bu_blocks = blks;
 341         }
 342
 343         return bucket;
 344 }
 345
 346 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
 347 {
 348         int i;
 349
 350         for (i = 0; i < bucket->bu_blocks; i++) {
 351                 brelse(bucket->bu_bhs[i]);
 352                 bucket->bu_bhs[i] = NULL;
 353         }
 354 }
 355
 356 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
 357 {
 358         if (bucket) {
 359                 ocfs2_xattr_bucket_relse(bucket);
 360                 bucket->bu_inode = NULL;
 361                 kfree(bucket);
 362         }
 363 }
 364
 365 /*
 366  * A bucket that has never been written to disk doesn't need to be
 367  * read.  We just need the buffer_heads.  Don't call this for
 368  * buckets that are already on disk.  ocfs2_read_xattr_bucket() initializes
 369  * them fully.
 370  */
 371 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 372                                    u64 xb_blkno)
 373 {
 374         int i, rc = 0;
 375
 376         for (i = 0; i < bucket->bu_blocks; i++) {
 377                 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
 378                                               xb_blkno + i);
 379                 if (!bucket->bu_bhs[i]) {
 380                         rc = -EIO;
 381                         mlog_errno(rc);
 382                         break;
 383                 }
 384
 385                 if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
 386                                            bucket->bu_bhs[i]))
 387                         ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
 388                                                       bucket->bu_bhs[i]);
 389         }
 390
 391         if (rc)
 392                 ocfs2_xattr_bucket_relse(bucket);
 393         return rc;
 394 }
 395
 396 /* Read the xattr bucket at xb_blkno */
 397 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 398                                    u64 xb_blkno)
 399 {
 400         int rc;
 401
 402         rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
 403                                bucket->bu_blocks, bucket->bu_bhs, 0,
 404                                NULL);
 405         if (!rc) {
 406                 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 407                 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
 408                                                  bucket->bu_bhs,
 409                                                  bucket->bu_blocks,
 410                                                  &bucket_xh(bucket)->xh_check);
 411                 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 412                 if (rc)
 413                         mlog_errno(rc);
 414         }
 415
 416         if (rc)
 417                 ocfs2_xattr_bucket_relse(bucket);
 418         return rc;
 419 }
 420
 421 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
 422                                              struct ocfs2_xattr_bucket *bucket,
 423                                              int type)
 424 {
 425         int i, rc = 0;
 426
 427         for (i = 0; i < bucket->bu_blocks; i++) {
 428                 rc = ocfs2_journal_access(handle,
 429                                           INODE_CACHE(bucket->bu_inode),
 430                                           bucket->bu_bhs[i], type);
 431                 if (rc) {
 432                         mlog_errno(rc);
 433                         break;
 434                 }
 435         }
 436
 437         return rc;
 438 }
 439
 440 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
 441                                              struct ocfs2_xattr_bucket *bucket)
 442 {
 443         int i;
 444
 445         spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 446         ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
 447                                    bucket->bu_bhs, bucket->bu_blocks,
 448                                    &bucket_xh(bucket)->xh_check);
 449         spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 450
 451         for (i = 0; i < bucket->bu_blocks; i++)
 452                 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
 453 }
 454
 455 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
 456                                          struct ocfs2_xattr_bucket *src)
 457 {
 458         int i;
 459         int blocksize = src->bu_inode->i_sb->s_blocksize;
 460
 461         BUG_ON(dest->bu_blocks != src->bu_blocks);
 462         BUG_ON(dest->bu_inode != src->bu_inode);
 463
 464         for (i = 0; i < src->bu_blocks; i++) {
 465                 memcpy(bucket_block(dest, i), bucket_block(src, i),
 466                        blocksize);
 467         }
 468 }
 469
 470 static int ocfs2_validate_xattr_block(struct super_block *sb,
 471                                       struct buffer_head *bh)
 472 {
 473         int rc;
 474         struct ocfs2_xattr_block *xb =
 475                 (struct ocfs2_xattr_block *)bh->b_data;
 476
 477         trace_ocfs2_validate_xattr_block((unsigned long long)bh->b_blocknr);
 478
 479         BUG_ON(!buffer_uptodate(bh));
 480
 481         /*
 482          * If the ecc fails, we return the error but otherwise
 483          * leave the filesystem running.  We know any error is
 484          * local to this block.
 485          */
 486         rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
 487         if (rc)
 488                 return rc;
 489
 490         /*
 491          * Errors after here are fatal
 492          */
 493
 494         if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
 495                 ocfs2_error(sb,
 496                             "Extended attribute block #%llu has bad "
 497                             "signature %.*s",
 498                             (unsigned long long)bh->b_blocknr, 7,
 499                             xb->xb_signature);
 500                 return -EINVAL;
 501         }
 502
 503         if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
 504                 ocfs2_error(sb,
 505                             "Extended attribute block #%llu has an "
 506                             "invalid xb_blkno of %llu",
 507                             (unsigned long long)bh->b_blocknr,
 508                             (unsigned long long)le64_to_cpu(xb->xb_blkno));
 509                 return -EINVAL;
 510         }
 511
 512         if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
 513                 ocfs2_error(sb,
 514                             "Extended attribute block #%llu has an invalid "
 515                             "xb_fs_generation of #%u",
 516                             (unsigned long long)bh->b_blocknr,
 517                             le32_to_cpu(xb->xb_fs_generation));
 518                 return -EINVAL;
 519         }
 520
 521         return 0;
 522 }
 523
 524 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
 525                                   struct buffer_head **bh)
 526 {
 527         int rc;
 528         struct buffer_head *tmp = *bh;
 529
 530         rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
 531                               ocfs2_validate_xattr_block);
 532
 533         /* If ocfs2_read_block() got us a new bh, pass it up. */
 534         if (!rc && !*bh)
 535                 *bh = tmp;
 536
 537         return rc;
 538 }
 539
 540 static inline const char *ocfs2_xattr_prefix(int name_index)
 541 {
 542         const struct xattr_handler *handler = NULL;
 543
 544         if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
 545                 handler = ocfs2_xattr_handler_map[name_index];
 546
 547         return handler ? handler->prefix : NULL;
 548 }
 549
 550 static u32 ocfs2_xattr_name_hash(struct inode *inode,
 551                                  const char *name,
 552                                  int name_len)
 553 {
 554         /* Get hash value of uuid from super block */
 555         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
 556         int i;
 557
 558         /* hash extended attribute name */
 559         for (i = 0; i < name_len; i++) {
 560                 hash = (hash << OCFS2_HASH_SHIFT) ^
 561                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
 562                        *name++;
 563         }
 564
 565         return hash;
 566 }
 567
 568 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
 569 {
 570         return namevalue_size(name_len, value_len) +
 571                 sizeof(struct ocfs2_xattr_entry);
 572 }
 573
 574 static int ocfs2_xi_entry_usage(struct ocfs2_xattr_info *xi)
 575 {
 576         return namevalue_size_xi(xi) +
 577                 sizeof(struct ocfs2_xattr_entry);
 578 }
 579
 580 static int ocfs2_xe_entry_usage(struct ocfs2_xattr_entry *xe)
 581 {
 582         return namevalue_size_xe(xe) +
 583                 sizeof(struct ocfs2_xattr_entry);
 584 }
 585
 586 int ocfs2_calc_security_init(struct inode *dir,
 587                              struct ocfs2_security_xattr_info *si,
 588                              int *want_clusters,
 589                              int *xattr_credits,
 590                              struct ocfs2_alloc_context **xattr_ac)
 591 {
 592         int ret = 0;
 593         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 594         int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
 595                                                  si->value_len);
 596
 597         /*
 598          * The max space of security xattr taken inline is
 599          * 256(name) + 80(value) + 16(entry) = 352 bytes,
 600          * So reserve one metadata block for it is ok.
 601          */
 602         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 603             s_size > OCFS2_XATTR_FREE_IN_IBODY) {
 604                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
 605                 if (ret) {
 606                         mlog_errno(ret);
 607                         return ret;
 608                 }
 609                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 610         }
 611
 612         /* reserve clusters for xattr value which will be set in B tree*/
 613         if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
 614                 int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
 615                                                             si->value_len);
 616
 617                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 618                                                            new_clusters);
 619                 *want_clusters += new_clusters;
 620         }
 621         return ret;
 622 }
 623
 624 int ocfs2_calc_xattr_init(struct inode *dir,
 625                           struct buffer_head *dir_bh,
 626                           int mode,
 627                           struct ocfs2_security_xattr_info *si,
 628                           int *want_clusters,
 629                           int *xattr_credits,
 630                           int *want_meta)
 631 {
 632         int ret = 0;
 633         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 634         int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
 635
 636         if (si->enable)
 637                 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
 638                                                      si->value_len);
 639
 640         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
 641                 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
 642                                         OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
 643                                         "", NULL, 0);
 644                 if (acl_len > 0) {
 645                         a_size = ocfs2_xattr_entry_real_size(0, acl_len);
 646                         if (S_ISDIR(mode))
 647                                 a_size <<= 1;
 648                 } else if (acl_len != 0 && acl_len != -ENODATA) {
 649                         mlog_errno(ret);
 650                         return ret;
 651                 }
 652         }
 653
 654         if (!(s_size + a_size))
 655                 return ret;
 656
 657         /*
 658          * The max space of security xattr taken inline is
 659          * 256(name) + 80(value) + 16(entry) = 352 bytes,
 660          * The max space of acl xattr taken inline is
 661          * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
 662          * when blocksize = 512, may reserve one more cluser for
 663          * xattr bucket, otherwise reserve one metadata block
 664          * for them is ok.
 665          * If this is a new directory with inline data,
 666          * we choose to reserve the entire inline area for
 667          * directory contents and force an external xattr block.
 668          */
 669         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 670             (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
 671             (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
 672                 *want_meta = *want_meta + 1;
 673                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 674         }
 675
 676         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
 677             (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
 678                 *want_clusters += 1;
 679                 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
 680         }
 681
 682         /*
 683          * reserve credits and clusters for xattrs which has large value
 684          * and have to be set outside
 685          */
 686         if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
 687                 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
 688                                                         si->value_len);
 689                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 690                                                            new_clusters);
 691                 *want_clusters += new_clusters;
 692         }
 693         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
 694             acl_len > OCFS2_XATTR_INLINE_SIZE) {
 695                 /* for directory, it has DEFAULT and ACCESS two types of acls */
 696                 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
 697                                 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
 698                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 699                                                            new_clusters);
 700                 *want_clusters += new_clusters;
 701         }
 702
 703         return ret;
 704 }
 705
 706 static int ocfs2_xattr_extend_allocation(struct inode *inode,
 707                                          u32 clusters_to_add,
 708                                          struct ocfs2_xattr_value_buf *vb,
 709                                          struct ocfs2_xattr_set_ctxt *ctxt)
 710 {
 711         int status = 0, credits;
 712         handle_t *handle = ctxt->handle;
 713         enum ocfs2_alloc_restarted why;
 714         u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
 715         struct ocfs2_extent_tree et;
 716
 717         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
 718
 719         while (clusters_to_add) {
 720                 trace_ocfs2_xattr_extend_allocation(clusters_to_add);
 721
 722                 status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
 723                                        OCFS2_JOURNAL_ACCESS_WRITE);
 724                 if (status < 0) {
 725                         mlog_errno(status);
 726                         break;
 727                 }
 728
 729                 prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
 730                 status = ocfs2_add_clusters_in_btree(handle,
 731                                                      &et,
 732                                                      &logical_start,
 733                                                      clusters_to_add,
 734                                                      0,
 735                                                      ctxt->data_ac,
 736                                                      ctxt->meta_ac,
 737                                                      &why);
 738                 if ((status < 0) && (status != -EAGAIN)) {
 739                         if (status != -ENOSPC)
 740                                 mlog_errno(status);
 741                         break;
 742                 }
 743
 744                 ocfs2_journal_dirty(handle, vb->vb_bh);
 745
 746                 clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) -
 747                                          prev_clusters;
 748
 749                 if (why != RESTART_NONE && clusters_to_add) {
 750                         /*
 751                          * We can only fail in case the alloc file doesn't give
 752                          * up enough clusters.
 753                          */
 754                         BUG_ON(why == RESTART_META);
 755
 756                         credits = ocfs2_calc_extend_credits(inode->i_sb,
 757                                                             &vb->vb_xv->xr_list,
 758                                                             clusters_to_add);
 759                         status = ocfs2_extend_trans(handle, credits);
 760                         if (status < 0) {
 761                                 status = -ENOMEM;
 762                                 mlog_errno(status);
 763                                 break;
 764                         }
 765                 }
 766         }
 767
 768         return status;
 769 }
 770
 771 static int __ocfs2_remove_xattr_range(struct inode *inode,
 772                                       struct ocfs2_xattr_value_buf *vb,
 773                                       u32 cpos, u32 phys_cpos, u32 len,
 774                                       unsigned int ext_flags,
 775                                       struct ocfs2_xattr_set_ctxt *ctxt)
 776 {
 777         int ret;
 778         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 779         handle_t *handle = ctxt->handle;
 780         struct ocfs2_extent_tree et;
 781
 782         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
 783
 784         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
 785                             OCFS2_JOURNAL_ACCESS_WRITE);
 786         if (ret) {
 787                 mlog_errno(ret);
 788                 goto out;
 789         }
 790
 791         ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
 792                                   &ctxt->dealloc);
 793         if (ret) {
 794                 mlog_errno(ret);
 795                 goto out;
 796         }
 797
 798         le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
 799         ocfs2_journal_dirty(handle, vb->vb_bh);
 800
 801         if (ext_flags & OCFS2_EXT_REFCOUNTED)
 802                 ret = ocfs2_decrease_refcount(inode, handle,
 803                                         ocfs2_blocks_to_clusters(inode->i_sb,
 804                                                                  phys_blkno),
 805                                         len, ctxt->meta_ac, &ctxt->dealloc, 1);
 806         else
 807                 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
 808                                                   phys_blkno, len);
 809         if (ret)
 810                 mlog_errno(ret);
 811
 812 out:
 813         return ret;
 814 }
 815
 816 static int ocfs2_xattr_shrink_size(struct inode *inode,
 817                                    u32 old_clusters,
 818                                    u32 new_clusters,
 819                                    struct ocfs2_xattr_value_buf *vb,
 820                                    struct ocfs2_xattr_set_ctxt *ctxt)
 821 {
 822         int ret = 0;
 823         unsigned int ext_flags;
 824         u32 trunc_len, cpos, phys_cpos, alloc_size;
 825         u64 block;
 826
 827         if (old_clusters <= new_clusters)
 828                 return 0;
 829
 830         cpos = new_clusters;
 831         trunc_len = old_clusters - new_clusters;
 832         while (trunc_len) {
 833                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
 834                                                &alloc_size,
 835                                                &vb->vb_xv->xr_list, &ext_flags);
 836                 if (ret) {
 837                         mlog_errno(ret);
 838                         goto out;
 839                 }
 840
 841                 if (alloc_size > trunc_len)
 842                         alloc_size = trunc_len;
 843
 844                 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
 845                                                  phys_cpos, alloc_size,
 846                                                  ext_flags, ctxt);
 847                 if (ret) {
 848                         mlog_errno(ret);
 849                         goto out;
 850                 }
 851
 852                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 853                 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
 854                                                        block, alloc_size);
 855                 cpos += alloc_size;
 856                 trunc_len -= alloc_size;
 857         }
 858
 859 out:
 860         return ret;
 861 }
 862
 863 static int ocfs2_xattr_value_truncate(struct inode *inode,
 864                                       struct ocfs2_xattr_value_buf *vb,
 865                                       int len,
 866                                       struct ocfs2_xattr_set_ctxt *ctxt)
 867 {
 868         int ret;
 869         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
 870         u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
 871
 872         if (new_clusters == old_clusters)
 873                 return 0;
 874
 875         if (new_clusters > old_clusters)
 876                 ret = ocfs2_xattr_extend_allocation(inode,
 877                                                     new_clusters - old_clusters,
 878                                                     vb, ctxt);
 879         else
 880                 ret = ocfs2_xattr_shrink_size(inode,
 881                                               old_clusters, new_clusters,
 882                                               vb, ctxt);
 883
 884         return ret;
 885 }
 886
 887 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
 888                                   size_t *result, const char *prefix,
 889                                   const char *name, int name_len)
 890 {
 891         char *p = buffer + *result;
 892         int prefix_len = strlen(prefix);
 893         int total_len = prefix_len + name_len + 1;
 894
 895         *result += total_len;
 896
 897         /* we are just looking for how big our buffer needs to be */
 898         if (!size)
 899                 return 0;
 900
 901         if (*result > size)
 902                 return -ERANGE;
 903
 904         memcpy(p, prefix, prefix_len);
 905         memcpy(p + prefix_len, name, name_len);
 906         p[prefix_len + name_len] = '\0';
 907
 908         return 0;
 909 }
 910
 911 static int ocfs2_xattr_list_entries(struct inode *inode,
 912                                     struct ocfs2_xattr_header *header,
 913                                     char *buffer, size_t buffer_size)
 914 {
 915         size_t result = 0;
 916         int i, type, ret;
 917         const char *prefix, *name;
 918
 919         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
 920                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
 921                 type = ocfs2_xattr_get_type(entry);
 922                 prefix = ocfs2_xattr_prefix(type);
 923
 924                 if (prefix) {
 925                         name = (const char *)header +
 926                                 le16_to_cpu(entry->xe_name_offset);
 927
 928                         ret = ocfs2_xattr_list_entry(buffer, buffer_size,
 929                                                      &result, prefix, name,
 930                                                      entry->xe_name_len);
 931                         if (ret)
 932                                 return ret;
 933                 }
 934         }
 935
 936         return result;
 937 }
 938
 939 int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
 940                                          struct ocfs2_dinode *di)
 941 {
 942         struct ocfs2_xattr_header *xh;
 943         int i;
 944
 945         xh = (struct ocfs2_xattr_header *)
 946                  ((void *)di + inode->i_sb->s_blocksize -
 947                  le16_to_cpu(di->i_xattr_inline_size));
 948
 949         for (i = 0; i < le16_to_cpu(xh->xh_count); i++)
 950                 if (!ocfs2_xattr_is_local(&xh->xh_entries[i]))
 951                         return 1;
 952
 953         return 0;
 954 }
 955
 956 static int ocfs2_xattr_ibody_list(struct inode *inode,
 957                                   struct ocfs2_dinode *di,
 958                                   char *buffer,
 959                                   size_t buffer_size)
 960 {
 961         struct ocfs2_xattr_header *header = NULL;
 962         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 963         int ret = 0;
 964
 965         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 966                 return ret;
 967
 968         header = (struct ocfs2_xattr_header *)
 969                  ((void *)di + inode->i_sb->s_blocksize -
 970                  le16_to_cpu(di->i_xattr_inline_size));
 971
 972         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
 973
 974         return ret;
 975 }
 976
 977 static int ocfs2_xattr_block_list(struct inode *inode,
 978                                   struct ocfs2_dinode *di,
 979                                   char *buffer,
 980                                   size_t buffer_size)
 981 {
 982         struct buffer_head *blk_bh = NULL;
 983         struct ocfs2_xattr_block *xb;
 984         int ret = 0;
 985
 986         if (!di->i_xattr_loc)
 987                 return ret;
 988
 989         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
 990                                      &blk_bh);
 991         if (ret < 0) {
 992                 mlog_errno(ret);
 993                 return ret;
 994         }
 995
 996         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 997         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 998                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
 999                 ret = ocfs2_xattr_list_entries(inode, header,
1000                                                buffer, buffer_size);
1001         } else
1002                 ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
1003                                                    buffer, buffer_size);
1004
1005         brelse(blk_bh);
1006
1007         return ret;
1008 }
1009
1010 ssize_t ocfs2_listxattr(struct dentry *dentry,
1011                         char *buffer,
1012                         size_t size)
1013 {
1014         int ret = 0, i_ret = 0, b_ret = 0;
1015         struct buffer_head *di_bh = NULL;
1016         struct ocfs2_dinode *di = NULL;
1017         struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
1018
1019         if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
1020                 return -EOPNOTSUPP;
1021
1022         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1023                 return ret;
1024
1025         ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
1026         if (ret < 0) {
1027                 mlog_errno(ret);
1028                 return ret;
1029         }
1030
1031         di = (struct ocfs2_dinode *)di_bh->b_data;
1032
1033         down_read(&oi->ip_xattr_sem);
1034         i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
1035         if (i_ret < 0)
1036                 b_ret = 0;
1037         else {
1038                 if (buffer) {
1039                         buffer += i_ret;
1040                         size -= i_ret;
1041                 }
1042                 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
1043                                                buffer, size);
1044                 if (b_ret < 0)
1045                         i_ret = 0;
1046         }
1047         up_read(&oi->ip_xattr_sem);
1048         ocfs2_inode_unlock(dentry->d_inode, 0);
1049
1050         brelse(di_bh);
1051
1052         return i_ret + b_ret;
1053 }
1054
1055 static int ocfs2_xattr_find_entry(int name_index,
1056                                   const char *name,
1057                                   struct ocfs2_xattr_search *xs)
1058 {
1059         struct ocfs2_xattr_entry *entry;
1060         size_t name_len;
1061         int i, cmp = 1;
1062
1063         if (name == NULL)
1064                 return -EINVAL;
1065
1066         name_len = strlen(name);
1067         entry = xs->here;
1068         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
1069                 cmp = name_index - ocfs2_xattr_get_type(entry);
1070                 if (!cmp)
1071                         cmp = name_len - entry->xe_name_len;
1072                 if (!cmp)
1073                         cmp = memcmp(name, (xs->base +
1074                                      le16_to_cpu(entry->xe_name_offset)),
1075                                      name_len);
1076                 if (cmp == 0)
1077                         break;
1078                 entry += 1;
1079         }
1080         xs->here = entry;
1081
1082         return cmp ? -ENODATA : 0;
1083 }
1084
1085 static int ocfs2_xattr_get_value_outside(struct inode *inode,
1086                                          struct ocfs2_xattr_value_root *xv,
1087                                          void *buffer,
1088                                          size_t len)
1089 {
1090         u32 cpos, p_cluster, num_clusters, bpc, clusters;
1091         u64 blkno;
1092         int i, ret = 0;
1093         size_t cplen, blocksize;
1094         struct buffer_head *bh = NULL;
1095         struct ocfs2_extent_list *el;
1096
1097         el = &xv->xr_list;
1098         clusters = le32_to_cpu(xv->xr_clusters);
1099         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1100         blocksize = inode->i_sb->s_blocksize;
1101
1102         cpos = 0;
1103         while (cpos < clusters) {
1104                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1105                                                &num_clusters, el, NULL);
1106                 if (ret) {
1107                         mlog_errno(ret);
1108                         goto out;
1109                 }
1110
1111                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1112                 /* Copy ocfs2_xattr_value */
1113                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1114                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1115                                                &bh, NULL);
1116                         if (ret) {
1117                                 mlog_errno(ret);
1118                                 goto out;
1119                         }
1120
1121                         cplen = len >= blocksize ? blocksize : len;
1122                         memcpy(buffer, bh->b_data, cplen);
1123                         len -= cplen;
1124                         buffer += cplen;
1125
1126                         brelse(bh);
1127                         bh = NULL;
1128                         if (len == 0)
1129                                 break;
1130                 }
1131                 cpos += num_clusters;
1132         }
1133 out:
1134         return ret;
1135 }
1136
1137 static int ocfs2_xattr_ibody_get(struct inode *inode,
1138                                  int name_index,
1139                                  const char *name,
1140                                  void *buffer,
1141                                  size_t buffer_size,
1142                                  struct ocfs2_xattr_search *xs)
1143 {
1144         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1145         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1146         struct ocfs2_xattr_value_root *xv;
1147         size_t size;
1148         int ret = 0;
1149
1150         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1151                 return -ENODATA;
1152
1153         xs->end = (void *)di + inode->i_sb->s_blocksize;
1154         xs->header = (struct ocfs2_xattr_header *)
1155                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1156         xs->base = (void *)xs->header;
1157         xs->here = xs->header->xh_entries;
1158
1159         ret = ocfs2_xattr_find_entry(name_index, name, xs);
1160         if (ret)
1161                 return ret;
1162         size = le64_to_cpu(xs->here->xe_value_size);
1163         if (buffer) {
1164                 if (size > buffer_size)
1165                         return -ERANGE;
1166                 if (ocfs2_xattr_is_local(xs->here)) {
1167                         memcpy(buffer, (void *)xs->base +
1168                                le16_to_cpu(xs->here->xe_name_offset) +
1169                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1170                 } else {
1171                         xv = (struct ocfs2_xattr_value_root *)
1172                                 (xs->base + le16_to_cpu(
1173                                  xs->here->xe_name_offset) +
1174                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1175                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1176                                                             buffer, size);
1177                         if (ret < 0) {
1178                                 mlog_errno(ret);
1179                                 return ret;
1180                         }
1181                 }
1182         }
1183
1184         return size;
1185 }
1186
1187 static int ocfs2_xattr_block_get(struct inode *inode,
1188                                  int name_index,
1189                                  const char *name,
1190                                  void *buffer,
1191                                  size_t buffer_size,
1192                                  struct ocfs2_xattr_search *xs)
1193 {
1194         struct ocfs2_xattr_block *xb;
1195         struct ocfs2_xattr_value_root *xv;
1196         size_t size;
1197         int ret = -ENODATA, name_offset, name_len, i;
1198         int uninitialized_var(block_off);
1199
1200         xs->bucket = ocfs2_xattr_bucket_new(inode);
1201         if (!xs->bucket) {
1202                 ret = -ENOMEM;
1203                 mlog_errno(ret);
1204                 goto cleanup;
1205         }
1206
1207         ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1208         if (ret) {
1209                 mlog_errno(ret);
1210                 goto cleanup;
1211         }
1212
1213         if (xs->not_found) {
1214                 ret = -ENODATA;
1215                 goto cleanup;
1216         }
1217
1218         xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1219         size = le64_to_cpu(xs->here->xe_value_size);
1220         if (buffer) {
1221                 ret = -ERANGE;
1222                 if (size > buffer_size)
1223                         goto cleanup;
1224
1225                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1226                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1227                 i = xs->here - xs->header->xh_entries;
1228
1229                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1230                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1231                                                                 bucket_xh(xs->bucket),
1232                                                                 i,
1233                                                                 &block_off,
1234                                                                 &name_offset);
1235                         xs->base = bucket_block(xs->bucket, block_off);
1236                 }
1237                 if (ocfs2_xattr_is_local(xs->here)) {
1238                         memcpy(buffer, (void *)xs->base +
1239                                name_offset + name_len, size);
1240                 } else {
1241                         xv = (struct ocfs2_xattr_value_root *)
1242                                 (xs->base + name_offset + name_len);
1243                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1244                                                             buffer, size);
1245                         if (ret < 0) {
1246                                 mlog_errno(ret);
1247                                 goto cleanup;
1248                         }
1249                 }
1250         }
1251         ret = size;
1252 cleanup:
1253         ocfs2_xattr_bucket_free(xs->bucket);
1254
1255         brelse(xs->xattr_bh);
1256         xs->xattr_bh = NULL;
1257         return ret;
1258 }
1259
1260 int ocfs2_xattr_get_nolock(struct inode *inode,
1261                            struct buffer_head *di_bh,
1262                            int name_index,
1263                            const char *name,
1264                            void *buffer,
1265                            size_t buffer_size)
1266 {
1267         int ret;
1268         struct ocfs2_dinode *di = NULL;
1269         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1270         struct ocfs2_xattr_search xis = {
1271                 .not_found = -ENODATA,
1272         };
1273         struct ocfs2_xattr_search xbs = {
1274                 .not_found = -ENODATA,
1275         };
1276
1277         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1278                 return -EOPNOTSUPP;
1279
1280         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1281                 ret = -ENODATA;
1282
1283         xis.inode_bh = xbs.inode_bh = di_bh;
1284         di = (struct ocfs2_dinode *)di_bh->b_data;
1285
1286         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1287                                     buffer_size, &xis);
1288         if (ret == -ENODATA && di->i_xattr_loc)
1289                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1290                                             buffer_size, &xbs);
1291
1292         return ret;
1293 }
1294
1295 /* ocfs2_xattr_get()
1296  *
1297  * Copy an extended attribute into the buffer provided.
1298  * Buffer is NULL to compute the size of buffer required.
1299  */
1300 static int ocfs2_xattr_get(struct inode *inode,
1301                            int name_index,
1302                            const char *name,
1303                            void *buffer,
1304                            size_t buffer_size)
1305 {
1306         int ret;
1307         struct buffer_head *di_bh = NULL;
1308
1309         ret = ocfs2_inode_lock(inode, &di_bh, 0);
1310         if (ret < 0) {
1311                 mlog_errno(ret);
1312                 return ret;
1313         }
1314         down_read(&OCFS2_I(inode)->ip_xattr_sem);
1315         ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1316                                      name, buffer, buffer_size);
1317         up_read(&OCFS2_I(inode)->ip_xattr_sem);
1318
1319         ocfs2_inode_unlock(inode, 0);
1320
1321         brelse(di_bh);
1322
1323         return ret;
1324 }
1325
1326 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1327                                            handle_t *handle,
1328                                            struct ocfs2_xattr_value_buf *vb,
1329                                            const void *value,
1330                                            int value_len)
1331 {
1332         int ret = 0, i, cp_len;
1333         u16 blocksize = inode->i_sb->s_blocksize;
1334         u32 p_cluster, num_clusters;
1335         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1336         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1337         u64 blkno;
1338         struct buffer_head *bh = NULL;
1339         unsigned int ext_flags;
1340         struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1341
1342         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1343
1344         while (cpos < clusters) {
1345                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1346                                                &num_clusters, &xv->xr_list,
1347                                                &ext_flags);
1348                 if (ret) {
1349                         mlog_errno(ret);
1350                         goto out;
1351                 }
1352
1353                 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1354
1355                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1356
1357                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1358                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1359                                                &bh, NULL);
1360                         if (ret) {
1361                                 mlog_errno(ret);
1362                                 goto out;
1363                         }
1364
1365                         ret = ocfs2_journal_access(handle,
1366                                                    INODE_CACHE(inode),
1367                                                    bh,
1368                                                    OCFS2_JOURNAL_ACCESS_WRITE);
1369                         if (ret < 0) {
1370                                 mlog_errno(ret);
1371                                 goto out;
1372                         }
1373
1374                         cp_len = value_len > blocksize ? blocksize : value_len;
1375                         memcpy(bh->b_data, value, cp_len);
1376                         value_len -= cp_len;
1377                         value += cp_len;
1378                         if (cp_len < blocksize)
1379                                 memset(bh->b_data + cp_len, 0,
1380                                        blocksize - cp_len);
1381
1382                         ocfs2_journal_dirty(handle, bh);
1383                         brelse(bh);
1384                         bh = NULL;
1385
1386                         /*
1387                          * XXX: do we need to empty all the following
1388                          * blocks in this cluster?
1389                          */
1390                         if (!value_len)
1391                                 break;
1392                 }
1393                 cpos += num_clusters;
1394         }
1395 out:
1396         brelse(bh);
1397
1398         return ret;
1399 }
1400
1401 static int ocfs2_xa_check_space_helper(int needed_space, int free_start,
1402                                        int num_entries)
1403 {
1404         int free_space;
1405
1406         if (!needed_space)
1407                 return 0;
1408
1409         free_space = free_start -
1410                 sizeof(struct ocfs2_xattr_header) -
1411                 (num_entries * sizeof(struct ocfs2_xattr_entry)) -
1412                 OCFS2_XATTR_HEADER_GAP;
1413         if (free_space < 0)
1414                 return -EIO;
1415         if (free_space < needed_space)
1416                 return -ENOSPC;
1417
1418         return 0;
1419 }
1420
1421 static int ocfs2_xa_journal_access(handle_t *handle, struct ocfs2_xa_loc *loc,
1422                                    int type)
1423 {
1424         return loc->xl_ops->xlo_journal_access(handle, loc, type);
1425 }
1426
1427 static void ocfs2_xa_journal_dirty(handle_t *handle, struct ocfs2_xa_loc *loc)
1428 {
1429         loc->xl_ops->xlo_journal_dirty(handle, loc);
1430 }
1431
1432 /* Give a pointer into the storage for the given offset */
1433 static void *ocfs2_xa_offset_pointer(struct ocfs2_xa_loc *loc, int offset)
1434 {
1435         BUG_ON(offset >= loc->xl_size);
1436         return loc->xl_ops->xlo_offset_pointer(loc, offset);
1437 }
1438
1439 /*
1440  * Wipe the name+value pair and allow the storage to reclaim it.  This
1441  * must be followed by either removal of the entry or a call to
1442  * ocfs2_xa_add_namevalue().
1443  */
1444 static void ocfs2_xa_wipe_namevalue(struct ocfs2_xa_loc *loc)
1445 {
1446         loc->xl_ops->xlo_wipe_namevalue(loc);
1447 }
1448
1449 /*
1450  * Find lowest offset to a name+value pair.  This is the start of our
1451  * downward-growing free space.
1452  */
1453 static int ocfs2_xa_get_free_start(struct ocfs2_xa_loc *loc)
1454 {
1455         return loc->xl_ops->xlo_get_free_start(loc);
1456 }
1457
1458 /* Can we reuse loc->xl_entry for xi? */
1459 static int ocfs2_xa_can_reuse_entry(struct ocfs2_xa_loc *loc,
1460                                     struct ocfs2_xattr_info *xi)
1461 {
1462         return loc->xl_ops->xlo_can_reuse(loc, xi);
1463 }
1464
1465 /* How much free space is needed to set the new value */
1466 static int ocfs2_xa_check_space(struct ocfs2_xa_loc *loc,
1467                                 struct ocfs2_xattr_info *xi)
1468 {
1469         return loc->xl_ops->xlo_check_space(loc, xi);
1470 }
1471
1472 static void ocfs2_xa_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1473 {
1474         loc->xl_ops->xlo_add_entry(loc, name_hash);
1475         loc->xl_entry->xe_name_hash = cpu_to_le32(name_hash);
1476         /*
1477          * We can't leave the new entry's xe_name_offset at zero or
1478          * add_namevalue() will go nuts.  We set it to the size of our
1479          * storage so that it can never be less than any other entry.
1480          */
1481         loc->xl_entry->xe_name_offset = cpu_to_le16(loc->xl_size);
1482 }
1483
1484 static void ocfs2_xa_add_namevalue(struct ocfs2_xa_loc *loc,
1485                                    struct ocfs2_xattr_info *xi)
1486 {
1487         int size = namevalue_size_xi(xi);
1488         int nameval_offset;
1489         char *nameval_buf;
1490
1491         loc->xl_ops->xlo_add_namevalue(loc, size);
1492         loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
1493         loc->xl_entry->xe_name_len = xi->xi_name_len;
1494         ocfs2_xattr_set_type(loc->xl_entry, xi->xi_name_index);
1495         ocfs2_xattr_set_local(loc->xl_entry,
1496                               xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE);
1497
1498         nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1499         nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
1500         memset(nameval_buf, 0, size);
1501         memcpy(nameval_buf, xi->xi_name, xi->xi_name_len);
1502 }
1503
1504 static void ocfs2_xa_fill_value_buf(struct ocfs2_xa_loc *loc,
1505                                     struct ocfs2_xattr_value_buf *vb)
1506 {
1507         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1508         int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
1509
1510         /* Value bufs are for value trees */
1511         BUG_ON(ocfs2_xattr_is_local(loc->xl_entry));
1512         BUG_ON(namevalue_size_xe(loc->xl_entry) !=
1513                (name_size + OCFS2_XATTR_ROOT_SIZE));
1514
1515         loc->xl_ops->xlo_fill_value_buf(loc, vb);
1516         vb->vb_xv =
1517                 (struct ocfs2_xattr_value_root *)ocfs2_xa_offset_pointer(loc,
1518                                                         nameval_offset +
1519                                                         name_size);
1520 }
1521
1522 static int ocfs2_xa_block_journal_access(handle_t *handle,
1523                                          struct ocfs2_xa_loc *loc, int type)
1524 {
1525         struct buffer_head *bh = loc->xl_storage;
1526         ocfs2_journal_access_func access;
1527
1528         if (loc->xl_size == (bh->b_size -
1529                              offsetof(struct ocfs2_xattr_block,
1530                                       xb_attrs.xb_header)))
1531                 access = ocfs2_journal_access_xb;
1532         else
1533                 access = ocfs2_journal_access_di;
1534         return access(handle, INODE_CACHE(loc->xl_inode), bh, type);
1535 }
1536
1537 static void ocfs2_xa_block_journal_dirty(handle_t *handle,
1538                                          struct ocfs2_xa_loc *loc)
1539 {
1540         struct buffer_head *bh = loc->xl_storage;
1541
1542         ocfs2_journal_dirty(handle, bh);
1543 }
1544
1545 static void *ocfs2_xa_block_offset_pointer(struct ocfs2_xa_loc *loc,
1546                                            int offset)
1547 {
1548         return (char *)loc->xl_header + offset;
1549 }
1550
1551 static int ocfs2_xa_block_can_reuse(struct ocfs2_xa_loc *loc,
1552                                     struct ocfs2_xattr_info *xi)
1553 {
1554         /*
1555          * Block storage is strict.  If the sizes aren't exact, we will
1556          * remove the old one and reinsert the new.
1557          */
1558         return namevalue_size_xe(loc->xl_entry) ==
1559                 namevalue_size_xi(xi);
1560 }
1561
1562 static int ocfs2_xa_block_get_free_start(struct ocfs2_xa_loc *loc)
1563 {
1564         struct ocfs2_xattr_header *xh = loc->xl_header;
1565         int i, count = le16_to_cpu(xh->xh_count);
1566         int offset, free_start = loc->xl_size;
1567
1568         for (i = 0; i < count; i++) {
1569                 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1570                 if (offset < free_start)
1571                         free_start = offset;
1572         }
1573
1574         return free_start;
1575 }
1576
1577 static int ocfs2_xa_block_check_space(struct ocfs2_xa_loc *loc,
1578                                       struct ocfs2_xattr_info *xi)
1579 {
1580         int count = le16_to_cpu(loc->xl_header->xh_count);
1581         int free_start = ocfs2_xa_get_free_start(loc);
1582         int needed_space = ocfs2_xi_entry_usage(xi);
1583
1584         /*
1585          * Block storage will reclaim the original entry before inserting
1586          * the new value, so we only need the difference.  If the new
1587          * entry is smaller than the old one, we don't need anything.
1588          */
1589         if (loc->xl_entry) {
1590                 /* Don't need space if we're reusing! */
1591                 if (ocfs2_xa_can_reuse_entry(loc, xi))
1592                         needed_space = 0;
1593                 else
1594                         needed_space -= ocfs2_xe_entry_usage(loc->xl_entry);
1595         }
1596         if (needed_space < 0)
1597                 needed_space = 0;
1598         return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1599 }
1600
1601 /*
1602  * Block storage for xattrs keeps the name+value pairs compacted.  When
1603  * we remove one, we have to shift any that preceded it towards the end.
1604  */
1605 static void ocfs2_xa_block_wipe_namevalue(struct ocfs2_xa_loc *loc)
1606 {
1607         int i, offset;
1608         int namevalue_offset, first_namevalue_offset, namevalue_size;
1609         struct ocfs2_xattr_entry *entry = loc->xl_entry;
1610         struct ocfs2_xattr_header *xh = loc->xl_header;
1611         int count = le16_to_cpu(xh->xh_count);
1612
1613         namevalue_offset = le16_to_cpu(entry->xe_name_offset);
1614         namevalue_size = namevalue_size_xe(entry);
1615         first_namevalue_offset = ocfs2_xa_get_free_start(loc);
1616
1617         /* Shift the name+value pairs */
1618         memmove((char *)xh + first_namevalue_offset + namevalue_size,
1619                 (char *)xh + first_namevalue_offset,
1620                 namevalue_offset - first_namevalue_offset);
1621         memset((char *)xh + first_namevalue_offset, 0, namevalue_size);
1622
1623         /* Now tell xh->xh_entries about it */
1624         for (i = 0; i < count; i++) {
1625                 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1626                 if (offset <= namevalue_offset)
1627                         le16_add_cpu(&xh->xh_entries[i].xe_name_offset,
1628                                      namevalue_size);
1629         }
1630
1631         /*
1632          * Note that we don't update xh_free_start or xh_name_value_len
1633          * because they're not used in block-stored xattrs.
1634          */
1635 }
1636
1637 static void ocfs2_xa_block_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1638 {
1639         int count = le16_to_cpu(loc->xl_header->xh_count);
1640         loc->xl_entry = &(loc->xl_header->xh_entries[count]);
1641         le16_add_cpu(&loc->xl_header->xh_count, 1);
1642         memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1643 }
1644
1645 static void ocfs2_xa_block_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1646 {
1647         int free_start = ocfs2_xa_get_free_start(loc);
1648
1649         loc->xl_entry->xe_name_offset = cpu_to_le16(free_start - size);
1650 }
1651
1652 static void ocfs2_xa_block_fill_value_buf(struct ocfs2_xa_loc *loc,
1653                                           struct ocfs2_xattr_value_buf *vb)
1654 {
1655         struct buffer_head *bh = loc->xl_storage;
1656
1657         if (loc->xl_size == (bh->b_size -
1658                              offsetof(struct ocfs2_xattr_block,
1659                                       xb_attrs.xb_header)))
1660                 vb->vb_access = ocfs2_journal_access_xb;
1661         else
1662                 vb->vb_access = ocfs2_journal_access_di;
1663         vb->vb_bh = bh;
1664 }
1665
1666 /*
1667  * Operations for xattrs stored in blocks.  This includes inline inode
1668  * storage and unindexed ocfs2_xattr_blocks.
1669  */
1670 static const struct ocfs2_xa_loc_operations ocfs2_xa_block_loc_ops = {
1671         .xlo_journal_access     = ocfs2_xa_block_journal_access,
1672         .xlo_journal_dirty      = ocfs2_xa_block_journal_dirty,
1673         .xlo_offset_pointer     = ocfs2_xa_block_offset_pointer,
1674         .xlo_check_space        = ocfs2_xa_block_check_space,
1675         .xlo_can_reuse          = ocfs2_xa_block_can_reuse,
1676         .xlo_get_free_start     = ocfs2_xa_block_get_free_start,
1677         .xlo_wipe_namevalue     = ocfs2_xa_block_wipe_namevalue,
1678         .xlo_add_entry          = ocfs2_xa_block_add_entry,
1679         .xlo_add_namevalue      = ocfs2_xa_block_add_namevalue,
1680         .xlo_fill_value_buf     = ocfs2_xa_block_fill_value_buf,
1681 };
1682
1683 static int ocfs2_xa_bucket_journal_access(handle_t *handle,
1684                                           struct ocfs2_xa_loc *loc, int type)
1685 {
1686         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1687
1688         return ocfs2_xattr_bucket_journal_access(handle, bucket, type);
1689 }
1690
1691 static void ocfs2_xa_bucket_journal_dirty(handle_t *handle,
1692                                           struct ocfs2_xa_loc *loc)
1693 {
1694         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1695
1696         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
1697 }
1698
1699 static void *ocfs2_xa_bucket_offset_pointer(struct ocfs2_xa_loc *loc,
1700                                             int offset)
1701 {
1702         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1703         int block, block_offset;
1704
1705         /* The header is at the front of the bucket */
1706         block = offset >> loc->xl_inode->i_sb->s_blocksize_bits;
1707         block_offset = offset % loc->xl_inode->i_sb->s_blocksize;
1708
1709         return bucket_block(bucket, block) + block_offset;
1710 }
1711
1712 static int ocfs2_xa_bucket_can_reuse(struct ocfs2_xa_loc *loc,
1713                                      struct ocfs2_xattr_info *xi)
1714 {
1715         return namevalue_size_xe(loc->xl_entry) >=
1716                 namevalue_size_xi(xi);
1717 }
1718
1719 static int ocfs2_xa_bucket_get_free_start(struct ocfs2_xa_loc *loc)
1720 {
1721         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1722         return le16_to_cpu(bucket_xh(bucket)->xh_free_start);
1723 }
1724
1725 static int ocfs2_bucket_align_free_start(struct super_block *sb,
1726                                          int free_start, int size)
1727 {
1728         /*
1729          * We need to make sure that the name+value pair fits within
1730          * one block.
1731          */
1732         if (((free_start - size) >> sb->s_blocksize_bits) !=
1733             ((free_start - 1) >> sb->s_blocksize_bits))
1734                 free_start -= free_start % sb->s_blocksize;
1735
1736         return free_start;
1737 }
1738
1739 static int ocfs2_xa_bucket_check_space(struct ocfs2_xa_loc *loc,
1740                                        struct ocfs2_xattr_info *xi)
1741 {
1742         int rc;
1743         int count = le16_to_cpu(loc->xl_header->xh_count);
1744         int free_start = ocfs2_xa_get_free_start(loc);
1745         int needed_space = ocfs2_xi_entry_usage(xi);
1746         int size = namevalue_size_xi(xi);
1747         struct super_block *sb = loc->xl_inode->i_sb;
1748
1749         /*
1750          * Bucket storage does not reclaim name+value pairs it cannot
1751          * reuse.  They live as holes until the bucket fills, and then
1752          * the bucket is defragmented.  However, the bucket can reclaim
1753          * the ocfs2_xattr_entry.
1754          */
1755         if (loc->xl_entry) {
1756                 /* Don't need space if we're reusing! */
1757                 if (ocfs2_xa_can_reuse_entry(loc, xi))
1758                         needed_space = 0;
1759                 else
1760                         needed_space -= sizeof(struct ocfs2_xattr_entry);
1761         }
1762         BUG_ON(needed_space < 0);
1763
1764         if (free_start < size) {
1765                 if (needed_space)
1766                         return -ENOSPC;
1767         } else {
1768                 /*
1769                  * First we check if it would fit in the first place.
1770                  * Below, we align the free start to a block.  This may
1771                  * slide us below the minimum gap.  By checking unaligned
1772                  * first, we avoid that error.
1773                  */
1774                 rc = ocfs2_xa_check_space_helper(needed_space, free_start,
1775                                                  count);
1776                 if (rc)
1777                         return rc;
1778                 free_start = ocfs2_bucket_align_free_start(sb, free_start,
1779                                                            size);
1780         }
1781         return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1782 }
1783
1784 static void ocfs2_xa_bucket_wipe_namevalue(struct ocfs2_xa_loc *loc)
1785 {
1786         le16_add_cpu(&loc->xl_header->xh_name_value_len,
1787                      -namevalue_size_xe(loc->xl_entry));
1788 }
1789
1790 static void ocfs2_xa_bucket_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1791 {
1792         struct ocfs2_xattr_header *xh = loc->xl_header;
1793         int count = le16_to_cpu(xh->xh_count);
1794         int low = 0, high = count - 1, tmp;
1795         struct ocfs2_xattr_entry *tmp_xe;
1796
1797         /*
1798          * We keep buckets sorted by name_hash, so we need to find
1799          * our insert place.
1800          */
1801         while (low <= high && count) {
1802                 tmp = (low + high) / 2;
1803                 tmp_xe = &xh->xh_entries[tmp];
1804
1805                 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
1806                         low = tmp + 1;
1807                 else if (name_hash < le32_to_cpu(tmp_xe->xe_name_hash))
1808                         high = tmp - 1;
1809                 else {
1810                         low = tmp;
1811                         break;
1812                 }
1813         }
1814
1815         if (low != count)
1816                 memmove(&xh->xh_entries[low + 1],
1817                         &xh->xh_entries[low],
1818                         ((count - low) * sizeof(struct ocfs2_xattr_entry)));
1819
1820         le16_add_cpu(&xh->xh_count, 1);
1821         loc->xl_entry = &xh->xh_entries[low];
1822         memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1823 }
1824
1825 static void ocfs2_xa_bucket_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1826 {
1827         int free_start = ocfs2_xa_get_free_start(loc);
1828         struct ocfs2_xattr_header *xh = loc->xl_header;
1829         struct super_block *sb = loc->xl_inode->i_sb;
1830         int nameval_offset;
1831
1832         free_start = ocfs2_bucket_align_free_start(sb, free_start, size);
1833         nameval_offset = free_start - size;
1834         loc->xl_entry->xe_name_offset = cpu_to_le16(nameval_offset);
1835         xh->xh_free_start = cpu_to_le16(nameval_offset);
1836         le16_add_cpu(&xh->xh_name_value_len, size);
1837
1838 }
1839
1840 static void ocfs2_xa_bucket_fill_value_buf(struct ocfs2_xa_loc *loc,
1841                                            struct ocfs2_xattr_value_buf *vb)
1842 {
1843         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1844         struct super_block *sb = loc->xl_inode->i_sb;
1845         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1846         int size = namevalue_size_xe(loc->xl_entry);
1847         int block_offset = nameval_offset >> sb->s_blocksize_bits;
1848
1849         /* Values are not allowed to straddle block boundaries */
1850         BUG_ON(block_offset !=
1851                ((nameval_offset + size - 1) >> sb->s_blocksize_bits));
1852         /* We expect the bucket to be filled in */
1853         BUG_ON(!bucket->bu_bhs[block_offset]);
1854
1855         vb->vb_access = ocfs2_journal_access;
1856         vb->vb_bh = bucket->bu_bhs[block_offset];
1857 }
1858
1859 /* Operations for xattrs stored in buckets. */
1860 static const struct ocfs2_xa_loc_operations ocfs2_xa_bucket_loc_ops = {
1861         .xlo_journal_access     = ocfs2_xa_bucket_journal_access,
1862         .xlo_journal_dirty      = ocfs2_xa_bucket_journal_dirty,
1863         .xlo_offset_pointer     = ocfs2_xa_bucket_offset_pointer,
1864         .xlo_check_space        = ocfs2_xa_bucket_check_space,
1865         .xlo_can_reuse          = ocfs2_xa_bucket_can_reuse,
1866         .xlo_get_free_start     = ocfs2_xa_bucket_get_free_start,
1867         .xlo_wipe_namevalue     = ocfs2_xa_bucket_wipe_namevalue,
1868         .xlo_add_entry          = ocfs2_xa_bucket_add_entry,
1869         .xlo_add_namevalue      = ocfs2_xa_bucket_add_namevalue,
1870         .xlo_fill_value_buf     = ocfs2_xa_bucket_fill_value_buf,
1871 };
1872
1873 static unsigned int ocfs2_xa_value_clusters(struct ocfs2_xa_loc *loc)
1874 {
1875         struct ocfs2_xattr_value_buf vb;
1876
1877         if (ocfs2_xattr_is_local(loc->xl_entry))
1878                 return 0;
1879
1880         ocfs2_xa_fill_value_buf(loc, &vb);
1881         return le32_to_cpu(vb.vb_xv->xr_clusters);
1882 }
1883
1884 static int ocfs2_xa_value_truncate(struct ocfs2_xa_loc *loc, u64 bytes,
1885                                    struct ocfs2_xattr_set_ctxt *ctxt)
1886 {
1887         int trunc_rc, access_rc;
1888         struct ocfs2_xattr_value_buf vb;
1889
1890         ocfs2_xa_fill_value_buf(loc, &vb);
1891         trunc_rc = ocfs2_xattr_value_truncate(loc->xl_inode, &vb, bytes,
1892                                               ctxt);
1893
1894         /*
1895          * The caller of ocfs2_xa_value_truncate() has already called
1896          * ocfs2_xa_journal_access on the loc.  However, The truncate code
1897          * calls ocfs2_extend_trans().  This may commit the previous
1898          * transaction and open a new one.  If this is a bucket, truncate
1899          * could leave only vb->vb_bh set up for journaling.  Meanwhile,
1900          * the caller is expecting to dirty the entire bucket.  So we must
1901          * reset the journal work.  We do this even if truncate has failed,
1902          * as it could have failed after committing the extend.
1903          */
1904         access_rc = ocfs2_xa_journal_access(ctxt->handle, loc,
1905                                             OCFS2_JOURNAL_ACCESS_WRITE);
1906
1907         /* Errors in truncate take precedence */
1908         return trunc_rc ? trunc_rc : access_rc;
1909 }
1910
1911 static void ocfs2_xa_remove_entry(struct ocfs2_xa_loc *loc)
1912 {
1913         int index, count;
1914         struct ocfs2_xattr_header *xh = loc->xl_header;
1915         struct ocfs2_xattr_entry *entry = loc->xl_entry;
1916
1917         ocfs2_xa_wipe_namevalue(loc);
1918         loc->xl_entry = NULL;
1919
1920         le16_add_cpu(&xh->xh_count, -1);
1921         count = le16_to_cpu(xh->xh_count);
1922
1923         /*
1924          * Only zero out the entry if there are more remaining.  This is
1925          * important for an empty bucket, as it keeps track of the
1926          * bucket's hash value.  It doesn't hurt empty block storage.
1927          */
1928         if (count) {
1929                 index = ((char *)entry - (char *)&xh->xh_entries) /
1930                         sizeof(struct ocfs2_xattr_entry);
1931                 memmove(&xh->xh_entries[index], &xh->xh_entries[index + 1],
1932                         (count - index) * sizeof(struct ocfs2_xattr_entry));
1933                 memset(&xh->xh_entries[count], 0,
1934                        sizeof(struct ocfs2_xattr_entry));
1935         }
1936 }
1937
1938 /*
1939  * If we have a problem adjusting the size of an external value during
1940  * ocfs2_xa_prepare_entry() or ocfs2_xa_remove(), we may have an xattr
1941  * in an intermediate state.  For example, the value may be partially
1942  * truncated.
1943  *
1944  * If the value tree hasn't changed, the extend/truncate went nowhere.
1945  * We have nothing to do.  The caller can treat it as a straight error.
1946  *
1947  * If the value tree got partially truncated, we now have a corrupted
1948  * extended attribute.  We're going to wipe its entry and leak the
1949  * clusters.  Better to leak some storage than leave a corrupt entry.
1950  *
1951  * If the value tree grew, it obviously didn't grow enough for the
1952  * new entry.  We're not going to try and reclaim those clusters either.
1953  * If there was already an external value there (orig_clusters != 0),
1954  * the new clusters are attached safely and we can just leave the old
1955  * value in place.  If there was no external value there, we remove
1956  * the entry.
1957  *
1958  * This way, the xattr block we store in the journal will be consistent.
1959  * If the size change broke because of the journal, no changes will hit
1960  * disk anyway.
1961  */
1962 static void ocfs2_xa_cleanup_value_truncate(struct ocfs2_xa_loc *loc,
1963                                             const char *what,
1964                                             unsigned int orig_clusters)
1965 {
1966         unsigned int new_clusters = ocfs2_xa_value_clusters(loc);
1967         char *nameval_buf = ocfs2_xa_offset_pointer(loc,
1968                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
1969
1970         if (new_clusters < orig_clusters) {
1971                 mlog(ML_ERROR,
1972                      "Partial truncate while %s xattr %.*s.  Leaking "
1973                      "%u clusters and removing the entry\n",
1974                      what, loc->xl_entry->xe_name_len, nameval_buf,
1975                      orig_clusters - new_clusters);
1976                 ocfs2_xa_remove_entry(loc);
1977         } else if (!orig_clusters) {
1978                 mlog(ML_ERROR,
1979                      "Unable to allocate an external value for xattr "
1980                      "%.*s safely.  Leaking %u clusters and removing the "
1981                      "entry\n",
1982                      loc->xl_entry->xe_name_len, nameval_buf,
1983                      new_clusters - orig_clusters);
1984                 ocfs2_xa_remove_entry(loc);
1985         } else if (new_clusters > orig_clusters)
1986                 mlog(ML_ERROR,
1987                      "Unable to grow xattr %.*s safely.  %u new clusters "
1988                      "have been added, but the value will not be "
1989                      "modified\n",
1990                      loc->xl_entry->xe_name_len, nameval_buf,
1991                      new_clusters - orig_clusters);
1992 }
1993
1994 static int ocfs2_xa_remove(struct ocfs2_xa_loc *loc,
1995                            struct ocfs2_xattr_set_ctxt *ctxt)
1996 {
1997         int rc = 0;
1998         unsigned int orig_clusters;
1999
2000         if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2001                 orig_clusters = ocfs2_xa_value_clusters(loc);
2002                 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2003                 if (rc) {
2004                         mlog_errno(rc);
2005                         /*
2006                          * Since this is remove, we can return 0 if
2007                          * ocfs2_xa_cleanup_value_truncate() is going to
2008                          * wipe the entry anyway.  So we check the
2009                          * cluster count as well.
2010                          */
2011                         if (orig_clusters != ocfs2_xa_value_clusters(loc))
2012                                 rc = 0;
2013                         ocfs2_xa_cleanup_value_truncate(loc, "removing",
2014                                                         orig_clusters);
2015                         if (rc)
2016                                 goto out;
2017                 }
2018         }
2019
2020         ocfs2_xa_remove_entry(loc);
2021
2022 out:
2023         return rc;
2024 }
2025
2026 static void ocfs2_xa_install_value_root(struct ocfs2_xa_loc *loc)
2027 {
2028         int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
2029         char *nameval_buf;
2030
2031         nameval_buf = ocfs2_xa_offset_pointer(loc,
2032                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
2033         memcpy(nameval_buf + name_size, &def_xv, OCFS2_XATTR_ROOT_SIZE);
2034 }
2035
2036 /*
2037  * Take an existing entry and make it ready for the new value.  This
2038  * won't allocate space, but it may free space.  It should be ready for
2039  * ocfs2_xa_prepare_entry() to finish the work.
2040  */
2041 static int ocfs2_xa_reuse_entry(struct ocfs2_xa_loc *loc,
2042                                 struct ocfs2_xattr_info *xi,
2043                                 struct ocfs2_xattr_set_ctxt *ctxt)
2044 {
2045         int rc = 0;
2046         int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2047         unsigned int orig_clusters;
2048         char *nameval_buf;
2049         int xe_local = ocfs2_xattr_is_local(loc->xl_entry);
2050         int xi_local = xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE;
2051
2052         BUG_ON(OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len) !=
2053                name_size);
2054
2055         nameval_buf = ocfs2_xa_offset_pointer(loc,
2056                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
2057         if (xe_local) {
2058                 memset(nameval_buf + name_size, 0,
2059                        namevalue_size_xe(loc->xl_entry) - name_size);
2060                 if (!xi_local)
2061                         ocfs2_xa_install_value_root(loc);
2062         } else {
2063                 orig_clusters = ocfs2_xa_value_clusters(loc);
2064                 if (xi_local) {
2065                         rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2066                         if (rc < 0)
2067                                 mlog_errno(rc);
2068                         else
2069                                 memset(nameval_buf + name_size, 0,
2070                                        namevalue_size_xe(loc->xl_entry) -
2071                                        name_size);
2072                 } else if (le64_to_cpu(loc->xl_entry->xe_value_size) >
2073                            xi->xi_value_len) {
2074                         rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len,
2075                                                      ctxt);
2076                         if (rc < 0)
2077                                 mlog_errno(rc);
2078                 }
2079
2080                 if (rc) {
2081                         ocfs2_xa_cleanup_value_truncate(loc, "reusing",
2082                                                         orig_clusters);
2083                         goto out;
2084                 }
2085         }
2086
2087         loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
2088         ocfs2_xattr_set_local(loc->xl_entry, xi_local);
2089
2090 out:
2091         return rc;
2092 }
2093
2094 /*
2095  * Prepares loc->xl_entry to receive the new xattr.  This includes
2096  * properly setting up the name+value pair region.  If loc->xl_entry
2097  * already exists, it will take care of modifying it appropriately.
2098  *
2099  * Note that this modifies the data.  You did journal_access already,
2100  * right?
2101  */
2102 static int ocfs2_xa_prepare_entry(struct ocfs2_xa_loc *loc,
2103                                   struct ocfs2_xattr_info *xi,
2104                                   u32 name_hash,
2105                                   struct ocfs2_xattr_set_ctxt *ctxt)
2106 {
2107         int rc = 0;
2108         unsigned int orig_clusters;
2109         __le64 orig_value_size = 0;
2110
2111         rc = ocfs2_xa_check_space(loc, xi);
2112         if (rc)
2113                 goto out;
2114
2115         if (loc->xl_entry) {
2116                 if (ocfs2_xa_can_reuse_entry(loc, xi)) {
2117                         orig_value_size = loc->xl_entry->xe_value_size;
2118                         rc = ocfs2_xa_reuse_entry(loc, xi, ctxt);
2119                         if (rc)
2120                                 goto out;
2121                         goto alloc_value;
2122                 }
2123
2124                 if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2125                         orig_clusters = ocfs2_xa_value_clusters(loc);
2126                         rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2127                         if (rc) {
2128                                 mlog_errno(rc);
2129                                 ocfs2_xa_cleanup_value_truncate(loc,
2130                                                                 "overwriting",
2131                                                                 orig_clusters);
2132                                 goto out;
2133                         }
2134                 }
2135                 ocfs2_xa_wipe_namevalue(loc);
2136         } else
2137                 ocfs2_xa_add_entry(loc, name_hash);
2138
2139         /*
2140          * If we get here, we have a blank entry.  Fill it.  We grow our
2141          * name+value pair back from the end.
2142          */
2143         ocfs2_xa_add_namevalue(loc, xi);
2144         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
2145                 ocfs2_xa_install_value_root(loc);
2146
2147 alloc_value:
2148         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2149                 orig_clusters = ocfs2_xa_value_clusters(loc);
2150                 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len, ctxt);
2151                 if (rc < 0) {
2152                         ctxt->set_abort = 1;
2153                         ocfs2_xa_cleanup_value_truncate(loc, "growing",
2154                                                         orig_clusters);
2155                         /*
2156                          * If we were growing an existing value,
2157                          * ocfs2_xa_cleanup_value_truncate() won't remove
2158                          * the entry. We need to restore the original value
2159                          * size.
2160                          */
2161                         if (loc->xl_entry) {
2162                                 BUG_ON(!orig_value_size);
2163                                 loc->xl_entry->xe_value_size = orig_value_size;
2164                         }
2165                         mlog_errno(rc);
2166                 }
2167         }
2168
2169 out:
2170         return rc;
2171 }
2172
2173 /*
2174  * Store the value portion of the name+value pair.  This will skip
2175  * values that are stored externally.  Their tree roots were set up
2176  * by ocfs2_xa_prepare_entry().
2177  */
2178 static int ocfs2_xa_store_value(struct ocfs2_xa_loc *loc,
2179                                 struct ocfs2_xattr_info *xi,
2180                                 struct ocfs2_xattr_set_ctxt *ctxt)
2181 {
2182         int rc = 0;
2183         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
2184         int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2185         char *nameval_buf;
2186         struct ocfs2_xattr_value_buf vb;
2187
2188         nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
2189         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2190                 ocfs2_xa_fill_value_buf(loc, &vb);
2191                 rc = __ocfs2_xattr_set_value_outside(loc->xl_inode,
2192                                                      ctxt->handle, &vb,
2193                                                      xi->xi_value,
2194                                                      xi->xi_value_len);
2195         } else
2196                 memcpy(nameval_buf + name_size, xi->xi_value, xi->xi_value_len);
2197
2198         return rc;
2199 }
2200
2201 static int ocfs2_xa_set(struct ocfs2_xa_loc *loc,
2202                         struct ocfs2_xattr_info *xi,
2203                         struct ocfs2_xattr_set_ctxt *ctxt)
2204 {
2205         int ret;
2206         u32 name_hash = ocfs2_xattr_name_hash(loc->xl_inode, xi->xi_name,
2207                                               xi->xi_name_len);
2208
2209         ret = ocfs2_xa_journal_access(ctxt->handle, loc,
2210                                       OCFS2_JOURNAL_ACCESS_WRITE);
2211         if (ret) {
2212                 mlog_errno(ret);
2213                 goto out;
2214         }
2215
2216         /*
2217          * From here on out, everything is going to modify the buffer a
2218          * little.  Errors are going to leave the xattr header in a
2219          * sane state.  Thus, even with errors we dirty the sucker.
2220          */
2221
2222         /* Don't worry, we are never called with !xi_value and !xl_entry */
2223         if (!xi->xi_value) {
2224                 ret = ocfs2_xa_remove(loc, ctxt);
2225                 goto out_dirty;
2226         }
2227
2228         ret = ocfs2_xa_prepare_entry(loc, xi, name_hash, ctxt);
2229         if (ret) {
2230                 if (ret != -ENOSPC)
2231                         mlog_errno(ret);
2232                 goto out_dirty;
2233         }
2234
2235         ret = ocfs2_xa_store_value(loc, xi, ctxt);
2236         if (ret)
2237                 mlog_errno(ret);
2238
2239 out_dirty:
2240         ocfs2_xa_journal_dirty(ctxt->handle, loc);
2241
2242 out:
2243         return ret;
2244 }
2245
2246 static void ocfs2_init_dinode_xa_loc(struct ocfs2_xa_loc *loc,
2247                                      struct inode *inode,
2248                                      struct buffer_head *bh,
2249                                      struct ocfs2_xattr_entry *entry)
2250 {
2251         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2252
2253         BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_XATTR_FL));
2254
2255         loc->xl_inode = inode;
2256         loc->xl_ops = &ocfs2_xa_block_loc_ops;
2257         loc->xl_storage = bh;
2258         loc->xl_entry = entry;
2259         loc->xl_size = le16_to_cpu(di->i_xattr_inline_size);
2260         loc->xl_header =
2261                 (struct ocfs2_xattr_header *)(bh->b_data + bh->b_size -
2262                                               loc->xl_size);
2263 }
2264
2265 static void ocfs2_init_xattr_block_xa_loc(struct ocfs2_xa_loc *loc,
2266                                           struct inode *inode,
2267                                           struct buffer_head *bh,
2268                                           struct ocfs2_xattr_entry *entry)
2269 {
2270         struct ocfs2_xattr_block *xb =
2271                 (struct ocfs2_xattr_block *)bh->b_data;
2272
2273         BUG_ON(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED);
2274
2275         loc->xl_inode = inode;
2276         loc->xl_ops = &ocfs2_xa_block_loc_ops;
2277         loc->xl_storage = bh;
2278         loc->xl_header = &(xb->xb_attrs.xb_header);
2279         loc->xl_entry = entry;
2280         loc->xl_size = bh->b_size - offsetof(struct ocfs2_xattr_block,
2281                                              xb_attrs.xb_header);
2282 }
2283
2284 static void ocfs2_init_xattr_bucket_xa_loc(struct ocfs2_xa_loc *loc,
2285                                            struct ocfs2_xattr_bucket *bucket,
2286                                            struct ocfs2_xattr_entry *entry)
2287 {
2288         loc->xl_inode = bucket->bu_inode;
2289         loc->xl_ops = &ocfs2_xa_bucket_loc_ops;
2290         loc->xl_storage = bucket;
2291         loc->xl_header = bucket_xh(bucket);
2292         loc->xl_entry = entry;
2293         loc->xl_size = OCFS2_XATTR_BUCKET_SIZE;
2294 }
2295
2296 /*
2297  * In xattr remove, if it is stored outside and refcounted, we may have
2298  * the chance to split the refcount tree. So need the allocators.
2299  */
2300 static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
2301                                         struct ocfs2_xattr_value_root *xv,
2302                                         struct ocfs2_caching_info *ref_ci,
2303                                         struct buffer_head *ref_root_bh,
2304                                         struct ocfs2_alloc_context **meta_ac,
2305                                         int *ref_credits)
2306 {
2307         int ret, meta_add = 0;
2308         u32 p_cluster, num_clusters;
2309         unsigned int ext_flags;
2310
2311         *ref_credits = 0;
2312         ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
2313                                        &num_clusters,
2314                                        &xv->xr_list,
2315                                        &ext_flags);
2316         if (ret) {
2317                 mlog_errno(ret);
2318                 goto out;
2319         }
2320
2321         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
2322                 goto out;
2323
2324         ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
2325                                                  ref_root_bh, xv,
2326                                                  &meta_add, ref_credits);
2327         if (ret) {
2328                 mlog_errno(ret);
2329                 goto out;
2330         }
2331
2332         ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2333                                                 meta_add, meta_ac);
2334         if (ret)
2335                 mlog_errno(ret);
2336
2337 out:
2338         return ret;
2339 }
2340
2341 static int ocfs2_remove_value_outside(struct inode*inode,
2342                                       struct ocfs2_xattr_value_buf *vb,
2343                                       struct ocfs2_xattr_header *header,
2344                                       struct ocfs2_caching_info *ref_ci,
2345                                       struct buffer_head *ref_root_bh)
2346 {
2347         int ret = 0, i, ref_credits;
2348         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2349         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2350         void *val;
2351
2352         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
2353
2354         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
2355                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
2356
2357                 if (ocfs2_xattr_is_local(entry))
2358                         continue;
2359
2360                 val = (void *)header +
2361                         le16_to_cpu(entry->xe_name_offset);
2362                 vb->vb_xv = (struct ocfs2_xattr_value_root *)
2363                         (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
2364
2365                 ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
2366                                                          ref_ci, ref_root_bh,
2367                                                          &ctxt.meta_ac,
2368                                                          &ref_credits);
2369
2370                 ctxt.handle = ocfs2_start_trans(osb, ref_credits +
2371                                         ocfs2_remove_extent_credits(osb->sb));
2372                 if (IS_ERR(ctxt.handle)) {
2373                         ret = PTR_ERR(ctxt.handle);
2374                         mlog_errno(ret);
2375                         break;
2376                 }
2377
2378                 ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
2379                 if (ret < 0) {
2380                         mlog_errno(ret);
2381                         break;
2382                 }
2383
2384                 ocfs2_commit_trans(osb, ctxt.handle);
2385                 if (ctxt.meta_ac) {
2386                         ocfs2_free_alloc_context(ctxt.meta_ac);
2387                         ctxt.meta_ac = NULL;
2388                 }
2389         }
2390
2391         if (ctxt.meta_ac)
2392                 ocfs2_free_alloc_context(ctxt.meta_ac);
2393         ocfs2_schedule_truncate_log_flush(osb, 1);
2394         ocfs2_run_deallocs(osb, &ctxt.dealloc);
2395         return ret;
2396 }
2397
2398 static int ocfs2_xattr_ibody_remove(struct inode *inode,
2399                                     struct buffer_head *di_bh,
2400                                     struct ocfs2_caching_info *ref_ci,
2401                                     struct buffer_head *ref_root_bh)
2402 {
2403
2404         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2405         struct ocfs2_xattr_header *header;
2406         int ret;
2407         struct ocfs2_xattr_value_buf vb = {
2408                 .vb_bh = di_bh,
2409                 .vb_access = ocfs2_journal_access_di,
2410         };
2411
2412         header = (struct ocfs2_xattr_header *)
2413                  ((void *)di + inode->i_sb->s_blocksize -
2414                  le16_to_cpu(di->i_xattr_inline_size));
2415
2416         ret = ocfs2_remove_value_outside(inode, &vb, header,
2417                                          ref_ci, ref_root_bh);
2418
2419         return ret;
2420 }
2421
2422 struct ocfs2_rm_xattr_bucket_para {
2423         struct ocfs2_caching_info *ref_ci;
2424         struct buffer_head *ref_root_bh;
2425 };
2426
2427 static int ocfs2_xattr_block_remove(struct inode *inode,
2428                                     struct buffer_head *blk_bh,
2429                                     struct ocfs2_caching_info *ref_ci,
2430                                     struct buffer_head *ref_root_bh)
2431 {
2432         struct ocfs2_xattr_block *xb;
2433         int ret = 0;
2434         struct ocfs2_xattr_value_buf vb = {
2435                 .vb_bh = blk_bh,
2436                 .vb_access = ocfs2_journal_access_xb,
2437         };
2438         struct ocfs2_rm_xattr_bucket_para args = {
2439                 .ref_ci = ref_ci,
2440                 .ref_root_bh = ref_root_bh,
2441         };
2442
2443         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2444         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2445                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2446                 ret = ocfs2_remove_value_outside(inode, &vb, header,
2447                                                  ref_ci, ref_root_bh);
2448         } else
2449                 ret = ocfs2_iterate_xattr_index_block(inode,
2450                                                 blk_bh,
2451                                                 ocfs2_rm_xattr_cluster,
2452                                                 &args);
2453
2454         return ret;
2455 }
2456
2457 static int ocfs2_xattr_free_block(struct inode *inode,
2458                                   u64 block,
2459                                   struct ocfs2_caching_info *ref_ci,
2460                                   struct buffer_head *ref_root_bh)
2461 {
2462         struct inode *xb_alloc_inode;
2463         struct buffer_head *xb_alloc_bh = NULL;
2464         struct buffer_head *blk_bh = NULL;
2465         struct ocfs2_xattr_block *xb;
2466         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2467         handle_t *handle;
2468         int ret = 0;
2469         u64 blk, bg_blkno;
2470         u16 bit;
2471
2472         ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2473         if (ret < 0) {
2474                 mlog_errno(ret);
2475                 goto out;
2476         }
2477
2478         ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2479         if (ret < 0) {
2480                 mlog_errno(ret);
2481                 goto out;
2482         }
2483
2484         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2485         blk = le64_to_cpu(xb->xb_blkno);
2486         bit = le16_to_cpu(xb->xb_suballoc_bit);
2487         if (xb->xb_suballoc_loc)
2488                 bg_blkno = le64_to_cpu(xb->xb_suballoc_loc);
2489         else
2490                 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2491
2492         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2493                                 EXTENT_ALLOC_SYSTEM_INODE,
2494                                 le16_to_cpu(xb->xb_suballoc_slot));
2495         if (!xb_alloc_inode) {
2496                 ret = -ENOMEM;
2497                 mlog_errno(ret);
2498                 goto out;
2499         }
2500         mutex_lock(&xb_alloc_inode->i_mutex);
2501
2502         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2503         if (ret < 0) {
2504                 mlog_errno(ret);
2505                 goto out_mutex;
2506         }
2507
2508         handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2509         if (IS_ERR(handle)) {
2510                 ret = PTR_ERR(handle);
2511                 mlog_errno(ret);
2512                 goto out_unlock;
2513         }
2514
2515         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2516                                        bit, bg_blkno, 1);
2517         if (ret < 0)
2518                 mlog_errno(ret);
2519
2520         ocfs2_commit_trans(osb, handle);
2521 out_unlock:
2522         ocfs2_inode_unlock(xb_alloc_inode, 1);
2523         brelse(xb_alloc_bh);
2524 out_mutex:
2525         mutex_unlock(&xb_alloc_inode->i_mutex);
2526         iput(xb_alloc_inode);
2527 out:
2528         brelse(blk_bh);
2529         return ret;
2530 }
2531
2532 /*
2533  * ocfs2_xattr_remove()
2534  *
2535  * Free extended attribute resources associated with this inode.
2536  */
2537 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2538 {
2539         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2540         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2541         struct ocfs2_refcount_tree *ref_tree = NULL;
2542         struct buffer_head *ref_root_bh = NULL;
2543         struct ocfs2_caching_info *ref_ci = NULL;
2544         handle_t *handle;
2545         int ret;
2546
2547         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2548                 return 0;
2549
2550         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2551                 return 0;
2552
2553         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
2554                 ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2555                                                le64_to_cpu(di->i_refcount_loc),
2556                                                1, &ref_tree, &ref_root_bh);
2557                 if (ret) {
2558                         mlog_errno(ret);
2559                         goto out;
2560                 }
2561                 ref_ci = &ref_tree->rf_ci;
2562
2563         }
2564
2565         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2566                 ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2567                                                ref_ci, ref_root_bh);
2568                 if (ret < 0) {
2569                         mlog_errno(ret);
2570                         goto out;
2571                 }
2572         }
2573
2574         if (di->i_xattr_loc) {
2575                 ret = ocfs2_xattr_free_block(inode,
2576                                              le64_to_cpu(di->i_xattr_loc),
2577                                              ref_ci, ref_root_bh);
2578                 if (ret < 0) {
2579                         mlog_errno(ret);
2580                         goto out;
2581                 }
2582         }
2583
2584         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2585                                    OCFS2_INODE_UPDATE_CREDITS);
2586         if (IS_ERR(handle)) {
2587                 ret = PTR_ERR(handle);
2588                 mlog_errno(ret);
2589                 goto out;
2590         }
2591         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2592                                       OCFS2_JOURNAL_ACCESS_WRITE);
2593         if (ret) {
2594                 mlog_errno(ret);
2595                 goto out_commit;
2596         }
2597
2598         di->i_xattr_loc = 0;
2599
2600         spin_lock(&oi->ip_lock);
2601         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2602         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2603         spin_unlock(&oi->ip_lock);
2604
2605         ocfs2_journal_dirty(handle, di_bh);
2606 out_commit:
2607         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2608 out:
2609         if (ref_tree)
2610                 ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2611         brelse(ref_root_bh);
2612         return ret;
2613 }
2614
2615 static int ocfs2_xattr_has_space_inline(struct inode *inode,
2616                                         struct ocfs2_dinode *di)
2617 {
2618         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2619         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2620         int free;
2621
2622         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2623                 return 0;
2624
2625         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2626                 struct ocfs2_inline_data *idata = &di->id2.i_data;
2627                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2628         } else if (ocfs2_inode_is_fast_symlink(inode)) {
2629                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
2630                         le64_to_cpu(di->i_size);
2631         } else {
2632                 struct ocfs2_extent_list *el = &di->id2.i_list;
2633                 free = (le16_to_cpu(el->l_count) -
2634                         le16_to_cpu(el->l_next_free_rec)) *
2635                         sizeof(struct ocfs2_extent_rec);
2636         }
2637         if (free >= xattrsize)
2638                 return 1;
2639
2640         return 0;
2641 }
2642
2643 /*
2644  * ocfs2_xattr_ibody_find()
2645  *
2646  * Find extended attribute in inode block and
2647  * fill search info into struct ocfs2_xattr_search.
2648  */
2649 static int ocfs2_xattr_ibody_find(struct inode *inode,
2650                                   int name_index,
2651                                   const char *name,
2652                                   struct ocfs2_xattr_search *xs)
2653 {
2654         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2655         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2656         int ret;
2657         int has_space = 0;
2658
2659         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2660                 return 0;
2661
2662         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2663                 down_read(&oi->ip_alloc_sem);
2664                 has_space = ocfs2_xattr_has_space_inline(inode, di);
2665                 up_read(&oi->ip_alloc_sem);
2666                 if (!has_space)
2667                         return 0;
2668         }
2669
2670         xs->xattr_bh = xs->inode_bh;
2671         xs->end = (void *)di + inode->i_sb->s_blocksize;
2672         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2673                 xs->header = (struct ocfs2_xattr_header *)
2674                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2675         else
2676                 xs->header = (struct ocfs2_xattr_header *)
2677                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2678         xs->base = (void *)xs->header;
2679         xs->here = xs->header->xh_entries;
2680
2681         /* Find the named attribute. */
2682         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2683                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2684                 if (ret && ret != -ENODATA)
2685                         return ret;
2686                 xs->not_found = ret;
2687         }
2688
2689         return 0;
2690 }
2691
2692 static int ocfs2_xattr_ibody_init(struct inode *inode,
2693                                   struct buffer_head *di_bh,
2694                                   struct ocfs2_xattr_set_ctxt *ctxt)
2695 {
2696         int ret;
2697         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2698         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2699         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2700         unsigned int xattrsize = osb->s_xattr_inline_size;
2701
2702         if (!ocfs2_xattr_has_space_inline(inode, di)) {
2703                 ret = -ENOSPC;
2704                 goto out;
2705         }
2706
2707         ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode), di_bh,
2708                                       OCFS2_JOURNAL_ACCESS_WRITE);
2709         if (ret) {
2710                 mlog_errno(ret);
2711                 goto out;
2712         }
2713
2714         /*
2715          * Adjust extent record count or inline data size
2716          * to reserve space for extended attribute.
2717          */
2718         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2719                 struct ocfs2_inline_data *idata = &di->id2.i_data;
2720                 le16_add_cpu(&idata->id_count, -xattrsize);
2721         } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
2722                 struct ocfs2_extent_list *el = &di->id2.i_list;
2723                 le16_add_cpu(&el->l_count, -(xattrsize /
2724                                              sizeof(struct ocfs2_extent_rec)));
2725         }
2726         di->i_xattr_inline_size = cpu_to_le16(xattrsize);
2727
2728         spin_lock(&oi->ip_lock);
2729         oi->ip_dyn_features |= OCFS2_INLINE_XATTR_FL|OCFS2_HAS_XATTR_FL;
2730         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2731         spin_unlock(&oi->ip_lock);
2732
2733         ocfs2_journal_dirty(ctxt->handle, di_bh);
2734
2735 out:
2736         return ret;
2737 }
2738
2739 /*
2740  * ocfs2_xattr_ibody_set()
2741  *
2742  * Set, replace or remove an extended attribute into inode block.
2743  *
2744  */
2745 static int ocfs2_xattr_ibody_set(struct inode *inode,
2746                                  struct ocfs2_xattr_info *xi,
2747                                  struct ocfs2_xattr_search *xs,
2748                                  struct ocfs2_xattr_set_ctxt *ctxt)
2749 {
2750         int ret;
2751         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2752         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2753         struct ocfs2_xa_loc loc;
2754
2755         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2756                 return -ENOSPC;
2757
2758         down_write(&oi->ip_alloc_sem);
2759         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2760                 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2761                         ret = -ENOSPC;
2762                         goto out;
2763                 }
2764         }
2765
2766         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2767                 ret = ocfs2_xattr_ibody_init(inode, xs->inode_bh, ctxt);
2768                 if (ret) {
2769                         if (ret != -ENOSPC)
2770                                 mlog_errno(ret);
2771                         goto out;
2772                 }
2773         }
2774
2775         ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
2776                                  xs->not_found ? NULL : xs->here);
2777         ret = ocfs2_xa_set(&loc, xi, ctxt);
2778         if (ret) {
2779                 if (ret != -ENOSPC)
2780                         mlog_errno(ret);
2781                 goto out;
2782         }
2783         xs->here = loc.xl_entry;
2784
2785 out:
2786         up_write(&oi->ip_alloc_sem);
2787
2788         return ret;
2789 }
2790
2791 /*
2792  * ocfs2_xattr_block_find()
2793  *
2794  * Find extended attribute in external block and
2795  * fill search info into struct ocfs2_xattr_search.
2796  */
2797 static int ocfs2_xattr_block_find(struct inode *inode,
2798                                   int name_index,
2799                                   const char *name,
2800                                   struct ocfs2_xattr_search *xs)
2801 {
2802         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2803         struct buffer_head *blk_bh = NULL;
2804         struct ocfs2_xattr_block *xb;
2805         int ret = 0;
2806
2807         if (!di->i_xattr_loc)
2808                 return ret;
2809
2810         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2811                                      &blk_bh);
2812         if (ret < 0) {
2813                 mlog_errno(ret);
2814                 return ret;
2815         }
2816
2817         xs->xattr_bh = blk_bh;
2818         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2819
2820         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2821                 xs->header = &xb->xb_attrs.xb_header;
2822                 xs->base = (void *)xs->header;
2823                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2824                 xs->here = xs->header->xh_entries;
2825
2826                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2827         } else
2828                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2829                                                    name_index,
2830                                                    name, xs);
2831
2832         if (ret && ret != -ENODATA) {
2833                 xs->xattr_bh = NULL;
2834                 goto cleanup;
2835         }
2836         xs->not_found = ret;
2837         return 0;
2838 cleanup:
2839         brelse(blk_bh);
2840
2841         return ret;
2842 }
2843
2844 static int ocfs2_create_xattr_block(struct inode *inode,
2845                                     struct buffer_head *inode_bh,
2846                                     struct ocfs2_xattr_set_ctxt *ctxt,
2847                                     int indexed,
2848                                     struct buffer_head **ret_bh)
2849 {
2850         int ret;
2851         u16 suballoc_bit_start;
2852         u32 num_got;
2853         u64 suballoc_loc, first_blkno;
2854         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)inode_bh->b_data;
2855         struct buffer_head *new_bh = NULL;
2856         struct ocfs2_xattr_block *xblk;
2857
2858         ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2859                                       inode_bh, OCFS2_JOURNAL_ACCESS_CREATE);
2860         if (ret < 0) {
2861                 mlog_errno(ret);
2862                 goto end;
2863         }
2864
2865         ret = ocfs2_claim_metadata(ctxt->handle, ctxt->meta_ac, 1,
2866                                    &suballoc_loc, &suballoc_bit_start,
2867                                    &num_got, &first_blkno);
2868         if (ret < 0) {
2869                 mlog_errno(ret);
2870                 goto end;
2871         }
2872
2873         new_bh = sb_getblk(inode->i_sb, first_blkno);
2874         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2875
2876         ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),
2877                                       new_bh,
2878                                       OCFS2_JOURNAL_ACCESS_CREATE);
2879         if (ret < 0) {
2880                 mlog_errno(ret);
2881                 goto end;
2882         }
2883
2884         /* Initialize ocfs2_xattr_block */
2885         xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2886         memset(xblk, 0, inode->i_sb->s_blocksize);
2887         strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2888         xblk->xb_suballoc_slot = cpu_to_le16(ctxt->meta_ac->ac_alloc_slot);
2889         xblk->xb_suballoc_loc = cpu_to_le64(suballoc_loc);
2890         xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2891         xblk->xb_fs_generation =
2892                 cpu_to_le32(OCFS2_SB(inode->i_sb)->fs_generation);
2893         xblk->xb_blkno = cpu_to_le64(first_blkno);
2894         if (indexed) {
2895                 struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2896                 xr->xt_clusters = cpu_to_le32(1);
2897                 xr->xt_last_eb_blk = 0;
2898                 xr->xt_list.l_tree_depth = 0;
2899                 xr->xt_list.l_count = cpu_to_le16(
2900                                         ocfs2_xattr_recs_per_xb(inode->i_sb));
2901                 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2902                 xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2903         }
2904         ocfs2_journal_dirty(ctxt->handle, new_bh);
2905
2906         /* Add it to the inode */
2907         di->i_xattr_loc = cpu_to_le64(first_blkno);
2908
2909         spin_lock(&OCFS2_I(inode)->ip_lock);
2910         OCFS2_I(inode)->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
2911         di->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
2912         spin_unlock(&OCFS2_I(inode)->ip_lock);
2913
2914         ocfs2_journal_dirty(ctxt->handle, inode_bh);
2915
2916         *ret_bh = new_bh;
2917         new_bh = NULL;
2918
2919 end:
2920         brelse(new_bh);
2921         return ret;
2922 }
2923
2924 /*
2925  * ocfs2_xattr_block_set()
2926  *
2927  * Set, replace or remove an extended attribute into external block.
2928  *
2929  */
2930 static int ocfs2_xattr_block_set(struct inode *inode,
2931                                  struct ocfs2_xattr_info *xi,
2932                                  struct ocfs2_xattr_search *xs,
2933                                  struct ocfs2_xattr_set_ctxt *ctxt)
2934 {
2935         struct buffer_head *new_bh = NULL;
2936         struct ocfs2_xattr_block *xblk = NULL;
2937         int ret;
2938         struct ocfs2_xa_loc loc;
2939
2940         if (!xs->xattr_bh) {
2941                 ret = ocfs2_create_xattr_block(inode, xs->inode_bh, ctxt,
2942                                                0, &new_bh);
2943                 if (ret) {
2944                         mlog_errno(ret);
2945                         goto end;
2946                 }
2947
2948                 xs->xattr_bh = new_bh;
2949                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2950                 xs->header = &xblk->xb_attrs.xb_header;
2951                 xs->base = (void *)xs->header;
2952                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2953                 xs->here = xs->header->xh_entries;
2954         } else
2955                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2956
2957         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2958                 ocfs2_init_xattr_block_xa_loc(&loc, inode, xs->xattr_bh,
2959                                               xs->not_found ? NULL : xs->here);
2960
2961                 ret = ocfs2_xa_set(&loc, xi, ctxt);
2962                 if (!ret)
2963                         xs->here = loc.xl_entry;
2964                 else if ((ret != -ENOSPC) || ctxt->set_abort)
2965                         goto end;
2966                 else {
2967                         ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2968                         if (ret)
2969                                 goto end;
2970                 }
2971         }
2972
2973         if (le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)
2974                 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2975
2976 end:
2977         return ret;
2978 }
2979
2980 /* Check whether the new xattr can be inserted into the inode. */
2981 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2982                                        struct ocfs2_xattr_info *xi,
2983                                        struct ocfs2_xattr_search *xs)
2984 {
2985         struct ocfs2_xattr_entry *last;
2986         int free, i;
2987         size_t min_offs = xs->end - xs->base;
2988
2989         if (!xs->header)
2990                 return 0;
2991
2992         last = xs->header->xh_entries;
2993
2994         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2995                 size_t offs = le16_to_cpu(last->xe_name_offset);
2996                 if (offs < min_offs)
2997                         min_offs = offs;
2998                 last += 1;
2999         }
3000
3001         free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
3002         if (free < 0)
3003                 return 0;
3004
3005         BUG_ON(!xs->not_found);
3006
3007         if (free >= (sizeof(struct ocfs2_xattr_entry) + namevalue_size_xi(xi)))
3008                 return 1;
3009
3010         return 0;
3011 }
3012
3013 static int ocfs2_calc_xattr_set_need(struct inode *inode,
3014                                      struct ocfs2_dinode *di,
3015                                      struct ocfs2_xattr_info *xi,
3016                                      struct ocfs2_xattr_search *xis,
3017                                      struct ocfs2_xattr_search *xbs,
3018                                      int *clusters_need,
3019                                      int *meta_need,
3020                                      int *credits_need)
3021 {
3022         int ret = 0, old_in_xb = 0;
3023         int clusters_add = 0, meta_add = 0, credits = 0;
3024         struct buffer_head *bh = NULL;
3025         struct ocfs2_xattr_block *xb = NULL;
3026         struct ocfs2_xattr_entry *xe = NULL;
3027         struct ocfs2_xattr_value_root *xv = NULL;
3028         char *base = NULL;
3029         int name_offset, name_len = 0;
3030         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3031                                                     xi->xi_value_len);
3032         u64 value_size;
3033
3034         /*
3035          * Calculate the clusters we need to write.
3036          * No matter whether we replace an old one or add a new one,
3037          * we need this for writing.
3038          */
3039         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
3040                 credits += new_clusters *
3041                            ocfs2_clusters_to_blocks(inode->i_sb, 1);
3042
3043         if (xis->not_found && xbs->not_found) {
3044                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3045
3046                 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3047                         clusters_add += new_clusters;
3048                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3049                                                         &def_xv.xv.xr_list,
3050                                                         new_clusters);
3051                 }
3052
3053                 goto meta_guess;
3054         }
3055
3056         if (!xis->not_found) {
3057                 xe = xis->here;
3058                 name_offset = le16_to_cpu(xe->xe_name_offset);
3059                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3060                 base = xis->base;
3061                 credits += OCFS2_INODE_UPDATE_CREDITS;
3062         } else {
3063                 int i, block_off = 0;
3064                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3065                 xe = xbs->here;
3066                 name_offset = le16_to_cpu(xe->xe_name_offset);
3067                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3068                 i = xbs->here - xbs->header->xh_entries;
3069                 old_in_xb = 1;
3070
3071                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3072                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3073                                                         bucket_xh(xbs->bucket),
3074                                                         i, &block_off,
3075                                                         &name_offset);
3076                         base = bucket_block(xbs->bucket, block_off);
3077                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3078                 } else {
3079                         base = xbs->base;
3080                         credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
3081                 }
3082         }
3083
3084         /*
3085          * delete a xattr doesn't need metadata and cluster allocation.
3086          * so just calculate the credits and return.
3087          *
3088          * The credits for removing the value tree will be extended
3089          * by ocfs2_remove_extent itself.
3090          */
3091         if (!xi->xi_value) {
3092                 if (!ocfs2_xattr_is_local(xe))
3093                         credits += ocfs2_remove_extent_credits(inode->i_sb);
3094
3095                 goto out;
3096         }
3097
3098         /* do cluster allocation guess first. */
3099         value_size = le64_to_cpu(xe->xe_value_size);
3100
3101         if (old_in_xb) {
3102                 /*
3103                  * In xattr set, we always try to set the xe in inode first,
3104                  * so if it can be inserted into inode successfully, the old
3105                  * one will be removed from the xattr block, and this xattr
3106                  * will be inserted into inode as a new xattr in inode.
3107                  */
3108                 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
3109                         clusters_add += new_clusters;
3110                         credits += ocfs2_remove_extent_credits(inode->i_sb) +
3111                                     OCFS2_INODE_UPDATE_CREDITS;
3112                         if (!ocfs2_xattr_is_local(xe))
3113                                 credits += ocfs2_calc_extend_credits(
3114                                                         inode->i_sb,
3115                                                         &def_xv.xv.xr_list,
3116                                                         new_clusters);
3117                         goto out;
3118                 }
3119         }
3120
3121         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3122                 /* the new values will be stored outside. */
3123                 u32 old_clusters = 0;
3124
3125                 if (!ocfs2_xattr_is_local(xe)) {
3126                         old_clusters =  ocfs2_clusters_for_bytes(inode->i_sb,
3127                                                                  value_size);
3128                         xv = (struct ocfs2_xattr_value_root *)
3129                              (base + name_offset + name_len);
3130                         value_size = OCFS2_XATTR_ROOT_SIZE;
3131                 } else
3132                         xv = &def_xv.xv;
3133
3134                 if (old_clusters >= new_clusters) {
3135                         credits += ocfs2_remove_extent_credits(inode->i_sb);
3136                         goto out;
3137                 } else {
3138                         meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
3139                         clusters_add += new_clusters - old_clusters;
3140                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3141                                                              &xv->xr_list,
3142                                                              new_clusters -
3143                                                              old_clusters);
3144                         if (value_size >= OCFS2_XATTR_ROOT_SIZE)
3145                                 goto out;
3146                 }
3147         } else {
3148                 /*
3149                  * Now the new value will be stored inside. So if the new
3150                  * value is smaller than the size of value root or the old
3151                  * value, we don't need any allocation, otherwise we have
3152                  * to guess metadata allocation.
3153                  */
3154                 if ((ocfs2_xattr_is_local(xe) &&
3155                      (value_size >= xi->xi_value_len)) ||
3156                     (!ocfs2_xattr_is_local(xe) &&
3157                      OCFS2_XATTR_ROOT_SIZE >= xi->xi_value_len))
3158                         goto out;
3159         }
3160
3161 meta_guess:
3162         /* calculate metadata allocation. */
3163         if (di->i_xattr_loc) {
3164                 if (!xbs->xattr_bh) {
3165                         ret = ocfs2_read_xattr_block(inode,
3166                                                      le64_to_cpu(di->i_xattr_loc),
3167                                                      &bh);
3168                         if (ret) {
3169                                 mlog_errno(ret);
3170                                 goto out;
3171                         }
3172
3173                         xb = (struct ocfs2_xattr_block *)bh->b_data;
3174                 } else
3175                         xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3176
3177                 /*
3178                  * If there is already an xattr tree, good, we can calculate
3179                  * like other b-trees. Otherwise we may have the chance of
3180                  * create a tree, the credit calculation is borrowed from
3181                  * ocfs2_calc_extend_credits with root_el = NULL. And the
3182                  * new tree will be cluster based, so no meta is needed.
3183                  */
3184                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3185                         struct ocfs2_extent_list *el =
3186                                  &xb->xb_attrs.xb_root.xt_list;
3187                         meta_add += ocfs2_extend_meta_needed(el);
3188                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3189                                                              el, 1);
3190                 } else
3191                         credits += OCFS2_SUBALLOC_ALLOC + 1;
3192
3193                 /*
3194                  * This cluster will be used either for new bucket or for
3195                  * new xattr block.
3196                  * If the cluster size is the same as the bucket size, one
3197                  * more is needed since we may need to extend the bucket
3198                  * also.
3199                  */
3200                 clusters_add += 1;
3201                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3202                 if (OCFS2_XATTR_BUCKET_SIZE ==
3203                         OCFS2_SB(inode->i_sb)->s_clustersize) {
3204                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3205                         clusters_add += 1;
3206                 }
3207         } else {
3208                 meta_add += 1;
3209                 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
3210         }
3211 out:
3212         if (clusters_need)
3213                 *clusters_need = clusters_add;
3214         if (meta_need)
3215                 *meta_need = meta_add;
3216         if (credits_need)
3217                 *credits_need = credits;
3218         brelse(bh);
3219         return ret;
3220 }
3221
3222 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
3223                                      struct ocfs2_dinode *di,
3224                                      struct ocfs2_xattr_info *xi,
3225                                      struct ocfs2_xattr_search *xis,
3226                                      struct ocfs2_xattr_search *xbs,
3227                                      struct ocfs2_xattr_set_ctxt *ctxt,
3228                                      int extra_meta,
3229                                      int *credits)
3230 {
3231         int clusters_add, meta_add, ret;
3232         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3233
3234         memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
3235
3236         ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
3237
3238         ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
3239                                         &clusters_add, &meta_add, credits);
3240         if (ret) {
3241                 mlog_errno(ret);
3242                 return ret;
3243         }
3244
3245         meta_add += extra_meta;
3246         trace_ocfs2_init_xattr_set_ctxt(xi->xi_name, meta_add,
3247                                         clusters_add, *credits);
3248
3249         if (meta_add) {
3250                 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
3251                                                         &ctxt->meta_ac);
3252                 if (ret) {
3253                         mlog_errno(ret);
3254                         goto out;
3255                 }
3256         }
3257
3258         if (clusters_add) {
3259                 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
3260                 if (ret)
3261                         mlog_errno(ret);
3262         }
3263 out:
3264         if (ret) {
3265                 if (ctxt->meta_ac) {
3266                         ocfs2_free_alloc_context(ctxt->meta_ac);
3267                         ctxt->meta_ac = NULL;
3268                 }
3269
3270                 /*
3271                  * We cannot have an error and a non null ctxt->data_ac.
3272                  */
3273         }
3274
3275         return ret;
3276 }
3277
3278 static int __ocfs2_xattr_set_handle(struct inode *inode,
3279                                     struct ocfs2_dinode *di,
3280                                     struct ocfs2_xattr_info *xi,
3281                                     struct ocfs2_xattr_search *xis,
3282                                     struct ocfs2_xattr_search *xbs,
3283                                     struct ocfs2_xattr_set_ctxt *ctxt)
3284 {
3285         int ret = 0, credits, old_found;
3286
3287         if (!xi->xi_value) {
3288                 /* Remove existing extended attribute */
3289                 if (!xis->not_found)
3290                         ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3291                 else if (!xbs->not_found)
3292                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3293         } else {
3294                 /* We always try to set extended attribute into inode first*/
3295                 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3296                 if (!ret && !xbs->not_found) {
3297                         /*
3298                          * If succeed and that extended attribute existing in
3299                          * external block, then we will remove it.
3300                          */
3301                         xi->xi_value = NULL;
3302                         xi->xi_value_len = 0;
3303
3304                         old_found = xis->not_found;
3305                         xis->not_found = -ENODATA;
3306                         ret = ocfs2_calc_xattr_set_need(inode,
3307                                                         di,
3308                                                         xi,
3309                                                         xis,
3310                                                         xbs,
3311                                                         NULL,
3312                                                         NULL,
3313                                                         &credits);
3314                         xis->not_found = old_found;
3315                         if (ret) {
3316                                 mlog_errno(ret);
3317                                 goto out;
3318                         }
3319
3320                         ret = ocfs2_extend_trans(ctxt->handle, credits);
3321                         if (ret) {
3322                                 mlog_errno(ret);
3323                                 goto out;
3324                         }
3325                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3326                 } else if ((ret == -ENOSPC) && !ctxt->set_abort) {
3327                         if (di->i_xattr_loc && !xbs->xattr_bh) {
3328                                 ret = ocfs2_xattr_block_find(inode,
3329                                                              xi->xi_name_index,
3330                                                              xi->xi_name, xbs);
3331                                 if (ret)
3332                                         goto out;
3333
3334                                 old_found = xis->not_found;
3335                                 xis->not_found = -ENODATA;
3336                                 ret = ocfs2_calc_xattr_set_need(inode,
3337                                                                 di,
3338                                                                 xi,
3339                                                                 xis,
3340                                                                 xbs,
3341                                                                 NULL,
3342                                                                 NULL,
3343                                                                 &credits);
3344                                 xis->not_found = old_found;
3345                                 if (ret) {
3346                                         mlog_errno(ret);
3347                                         goto out;
3348                                 }
3349
3350                                 ret = ocfs2_extend_trans(ctxt->handle, credits);
3351                                 if (ret) {
3352                                         mlog_errno(ret);
3353                                         goto out;
3354                                 }
3355                         }
3356                         /*
3357                          * If no space in inode, we will set extended attribute
3358                          * into external block.
3359                          */
3360                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3361                         if (ret)
3362                                 goto out;
3363                         if (!xis->not_found) {
3364                                 /*
3365                                  * If succeed and that extended attribute
3366                                  * existing in inode, we will remove it.
3367                                  */
3368                                 xi->xi_value = NULL;
3369                                 xi->xi_value_len = 0;
3370                                 xbs->not_found = -ENODATA;
3371                                 ret = ocfs2_calc_xattr_set_need(inode,
3372                                                                 di,
3373                                                                 xi,
3374                                                                 xis,
3375                                                                 xbs,
3376                                                                 NULL,
3377                                                                 NULL,
3378                                                                 &credits);
3379                                 if (ret) {
3380                                         mlog_errno(ret);
3381                                         goto out;
3382                                 }
3383
3384                                 ret = ocfs2_extend_trans(ctxt->handle, credits);
3385                                 if (ret) {
3386                                         mlog_errno(ret);
3387                                         goto out;
3388                                 }
3389                                 ret = ocfs2_xattr_ibody_set(inode, xi,
3390                                                             xis, ctxt);
3391                         }
3392                 }
3393         }
3394
3395         if (!ret) {
3396                 /* Update inode ctime. */
3397                 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3398                                               xis->inode_bh,
3399                                               OCFS2_JOURNAL_ACCESS_WRITE);
3400                 if (ret) {
3401                         mlog_errno(ret);
3402                         goto out;
3403                 }
3404
3405                 inode->i_ctime = CURRENT_TIME;
3406                 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3407                 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3408                 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3409         }
3410 out:
3411         return ret;
3412 }
3413
3414 /*
3415  * This function only called duing creating inode
3416  * for init security/acl xattrs of the new inode.
3417  * All transanction credits have been reserved in mknod.
3418  */
3419 int ocfs2_xattr_set_handle(handle_t *handle,
3420                            struct inode *inode,
3421                            struct buffer_head *di_bh,
3422                            int name_index,
3423                            const char *name,
3424                            const void *value,
3425                            size_t value_len,
3426                            int flags,
3427                            struct ocfs2_alloc_context *meta_ac,
3428                            struct ocfs2_alloc_context *data_ac)
3429 {
3430         struct ocfs2_dinode *di;
3431         int ret;
3432
3433         struct ocfs2_xattr_info xi = {
3434                 .xi_name_index = name_index,
3435                 .xi_name = name,
3436                 .xi_name_len = strlen(name),
3437                 .xi_value = value,
3438                 .xi_value_len = value_len,
3439         };
3440
3441         struct ocfs2_xattr_search xis = {
3442                 .not_found = -ENODATA,
3443         };
3444
3445         struct ocfs2_xattr_search xbs = {
3446                 .not_found = -ENODATA,
3447         };
3448
3449         struct ocfs2_xattr_set_ctxt ctxt = {
3450                 .handle = handle,
3451                 .meta_ac = meta_ac,
3452                 .data_ac = data_ac,
3453         };
3454
3455         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3456                 return -EOPNOTSUPP;
3457
3458         /*
3459          * In extreme situation, may need xattr bucket when
3460          * block size is too small. And we have already reserved
3461          * the credits for bucket in mknod.
3462          */
3463         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3464                 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3465                 if (!xbs.bucket) {
3466                         mlog_errno(-ENOMEM);
3467                         return -ENOMEM;
3468                 }
3469         }
3470
3471         xis.inode_bh = xbs.inode_bh = di_bh;
3472         di = (struct ocfs2_dinode *)di_bh->b_data;
3473
3474         down_write(&OCFS2_I(inode)->ip_xattr_sem);
3475
3476         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3477         if (ret)
3478                 goto cleanup;
3479         if (xis.not_found) {
3480                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3481                 if (ret)
3482                         goto cleanup;
3483         }
3484
3485         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3486
3487 cleanup:
3488         up_write(&OCFS2_I(inode)->ip_xattr_sem);
3489         brelse(xbs.xattr_bh);
3490         ocfs2_xattr_bucket_free(xbs.bucket);
3491
3492         return ret;
3493 }
3494
3495 /*
3496  * ocfs2_xattr_set()
3497  *
3498  * Set, replace or remove an extended attribute for this inode.
3499  * value is NULL to remove an existing extended attribute, else either
3500  * create or replace an extended attribute.
3501  */
3502 int ocfs2_xattr_set(struct inode *inode,
3503                     int name_index,
3504                     const char *name,
3505                     const void *value,
3506                     size_t value_len,
3507                     int flags)
3508 {
3509         struct buffer_head *di_bh = NULL;
3510         struct ocfs2_dinode *di;
3511         int ret, credits, ref_meta = 0, ref_credits = 0;
3512         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3513         struct inode *tl_inode = osb->osb_tl_inode;
3514         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
3515         struct ocfs2_refcount_tree *ref_tree = NULL;
3516
3517         struct ocfs2_xattr_info xi = {
3518                 .xi_name_index = name_index,
3519                 .xi_name = name,
3520                 .xi_name_len = strlen(name),
3521                 .xi_value = value,
3522                 .xi_value_len = value_len,
3523         };
3524
3525         struct ocfs2_xattr_search xis = {
3526                 .not_found = -ENODATA,
3527         };
3528
3529         struct ocfs2_xattr_search xbs = {
3530                 .not_found = -ENODATA,
3531         };
3532
3533         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3534                 return -EOPNOTSUPP;
3535
3536         /*
3537          * Only xbs will be used on indexed trees.  xis doesn't need a
3538          * bucket.
3539          */
3540         xbs.bucket = ocfs2_xattr_bucket_new(inode);
3541         if (!xbs.bucket) {
3542                 mlog_errno(-ENOMEM);
3543                 return -ENOMEM;
3544         }
3545
3546         ret = ocfs2_inode_lock(inode, &di_bh, 1);
3547         if (ret < 0) {
3548                 mlog_errno(ret);
3549                 goto cleanup_nolock;
3550         }
3551         xis.inode_bh = xbs.inode_bh = di_bh;
3552         di = (struct ocfs2_dinode *)di_bh->b_data;
3553
3554         down_write(&OCFS2_I(inode)->ip_xattr_sem);
3555         /*
3556          * Scan inode and external block to find the same name
3557          * extended attribute and collect search infomation.
3558          */
3559         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3560         if (ret)
3561                 goto cleanup;
3562         if (xis.not_found) {
3563                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3564                 if (ret)
3565                         goto cleanup;
3566         }
3567
3568         if (xis.not_found && xbs.not_found) {
3569                 ret = -ENODATA;
3570                 if (flags & XATTR_REPLACE)
3571                         goto cleanup;
3572                 ret = 0;
3573                 if (!value)
3574                         goto cleanup;
3575         } else {
3576                 ret = -EEXIST;
3577                 if (flags & XATTR_CREATE)
3578                         goto cleanup;
3579         }
3580
3581         /* Check whether the value is refcounted and do some prepartion. */
3582         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
3583             (!xis.not_found || !xbs.not_found)) {
3584                 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3585                                                    &xis, &xbs, &ref_tree,
3586                                                    &ref_meta, &ref_credits);
3587                 if (ret) {
3588                         mlog_errno(ret);
3589                         goto cleanup;
3590                 }
3591         }
3592
3593         mutex_lock(&tl_inode->i_mutex);
3594
3595         if (ocfs2_truncate_log_needs_flush(osb)) {
3596                 ret = __ocfs2_flush_truncate_log(osb);
3597                 if (ret < 0) {
3598                         mutex_unlock(&tl_inode->i_mutex);
3599                         mlog_errno(ret);
3600                         goto cleanup;
3601                 }
3602         }
3603         mutex_unlock(&tl_inode->i_mutex);
3604
3605         ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3606                                         &xbs, &ctxt, ref_meta, &credits);
3607         if (ret) {
3608                 mlog_errno(ret);
3609                 goto cleanup;
3610         }
3611
3612         /* we need to update inode's ctime field, so add credit for it. */
3613         credits += OCFS2_INODE_UPDATE_CREDITS;
3614         ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3615         if (IS_ERR(ctxt.handle)) {
3616                 ret = PTR_ERR(ctxt.handle);
3617                 mlog_errno(ret);
3618                 goto cleanup;
3619         }
3620
3621         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3622
3623         ocfs2_commit_trans(osb, ctxt.handle);
3624
3625         if (ctxt.data_ac)
3626                 ocfs2_free_alloc_context(ctxt.data_ac);
3627         if (ctxt.meta_ac)
3628                 ocfs2_free_alloc_context(ctxt.meta_ac);
3629         if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3630                 ocfs2_schedule_truncate_log_flush(osb, 1);
3631         ocfs2_run_deallocs(osb, &ctxt.dealloc);
3632
3633 cleanup:
3634         if (ref_tree)
3635                 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3636         up_write(&OCFS2_I(inode)->ip_xattr_sem);
3637         if (!value && !ret) {
3638                 ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3639                 if (ret)
3640                         mlog_errno(ret);
3641         }
3642         ocfs2_inode_unlock(inode, 1);
3643 cleanup_nolock:
3644         brelse(di_bh);
3645         brelse(xbs.xattr_bh);
3646         ocfs2_xattr_bucket_free(xbs.bucket);
3647
3648         return ret;
3649 }
3650
3651 /*
3652  * Find the xattr extent rec which may contains name_hash.
3653  * e_cpos will be the first name hash of the xattr rec.
3654  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3655  */
3656 static int ocfs2_xattr_get_rec(struct inode *inode,
3657                                u32 name_hash,
3658                                u64 *p_blkno,
3659                                u32 *e_cpos,
3660                                u32 *num_clusters,
3661                                struct ocfs2_extent_list *el)
3662 {
3663         int ret = 0, i;
3664         struct buffer_head *eb_bh = NULL;
3665         struct ocfs2_extent_block *eb;
3666         struct ocfs2_extent_rec *rec = NULL;
3667         u64 e_blkno = 0;
3668
3669         if (el->l_tree_depth) {
3670                 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3671                                       &eb_bh);
3672                 if (ret) {
3673                         mlog_errno(ret);
3674                         goto out;
3675                 }
3676
3677                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3678                 el = &eb->h_list;
3679
3680                 if (el->l_tree_depth) {
3681                         ocfs2_error(inode->i_sb,
3682                                     "Inode %lu has non zero tree depth in "
3683                                     "xattr tree block %llu\n", inode->i_ino,
3684                                     (unsigned long long)eb_bh->b_blocknr);
3685                         ret = -EROFS;
3686                         goto out;
3687                 }
3688         }
3689
3690         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3691                 rec = &el->l_recs[i];
3692
3693                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3694                         e_blkno = le64_to_cpu(rec->e_blkno);
3695                         break;
3696                 }
3697         }
3698
3699         if (!e_blkno) {
3700                 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
3701                             "record (%u, %u, 0) in xattr", inode->i_ino,
3702                             le32_to_cpu(rec->e_cpos),
3703                             ocfs2_rec_clusters(el, rec));
3704                 ret = -EROFS;
3705                 goto out;
3706         }
3707
3708         *p_blkno = le64_to_cpu(rec->e_blkno);
3709         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3710         if (e_cpos)
3711                 *e_cpos = le32_to_cpu(rec->e_cpos);
3712 out:
3713         brelse(eb_bh);
3714         return ret;
3715 }
3716
3717 typedef int (xattr_bucket_func)(struct inode *inode,
3718                                 struct ocfs2_xattr_bucket *bucket,
3719                                 void *para);
3720
3721 static int ocfs2_find_xe_in_bucket(struct inode *inode,
3722                                    struct ocfs2_xattr_bucket *bucket,
3723                                    int name_index,
3724                                    const char *name,
3725                                    u32 name_hash,
3726                                    u16 *xe_index,
3727                                    int *found)
3728 {
3729         int i, ret = 0, cmp = 1, block_off, new_offset;
3730         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3731         size_t name_len = strlen(name);
3732         struct ocfs2_xattr_entry *xe = NULL;
3733         char *xe_name;
3734
3735         /*
3736          * We don't use binary search in the bucket because there
3737          * may be multiple entries with the same name hash.
3738          */
3739         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3740                 xe = &xh->xh_entries[i];
3741
3742                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3743                         continue;
3744                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3745                         break;
3746
3747                 cmp = name_index - ocfs2_xattr_get_type(xe);
3748                 if (!cmp)
3749                         cmp = name_len - xe->xe_name_len;
3750                 if (cmp)
3751                         continue;
3752
3753                 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3754                                                         xh,
3755                                                         i,
3756                                                         &block_off,
3757                                                         &new_offset);
3758                 if (ret) {
3759                         mlog_errno(ret);
3760                         break;
3761                 }
3762
3763
3764                 xe_name = bucket_block(bucket, block_off) + new_offset;
3765                 if (!memcmp(name, xe_name, name_len)) {
3766                         *xe_index = i;
3767                         *found = 1;
3768                         ret = 0;
3769                         break;
3770                 }
3771         }
3772
3773         return ret;
3774 }
3775
3776 /*
3777  * Find the specified xattr entry in a series of buckets.
3778  * This series start from p_blkno and last for num_clusters.
3779  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3780  * the num of the valid buckets.
3781  *
3782  * Return the buffer_head this xattr should reside in. And if the xattr's
3783  * hash is in the gap of 2 buckets, return the lower bucket.
3784  */
3785 static int ocfs2_xattr_bucket_find(struct inode *inode,
3786                                    int name_index,
3787                                    const char *name,
3788                                    u32 name_hash,
3789                                    u64 p_blkno,
3790                                    u32 first_hash,
3791                                    u32 num_clusters,
3792                                    struct ocfs2_xattr_search *xs)
3793 {
3794         int ret, found = 0;
3795         struct ocfs2_xattr_header *xh = NULL;
3796         struct ocfs2_xattr_entry *xe = NULL;
3797         u16 index = 0;
3798         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3799         int low_bucket = 0, bucket, high_bucket;
3800         struct ocfs2_xattr_bucket *search;
3801         u32 last_hash;
3802         u64 blkno, lower_blkno = 0;
3803
3804         search = ocfs2_xattr_bucket_new(inode);
3805         if (!search) {
3806                 ret = -ENOMEM;
3807                 mlog_errno(ret);
3808                 goto out;
3809         }
3810
3811         ret = ocfs2_read_xattr_bucket(search, p_blkno);
3812         if (ret) {
3813                 mlog_errno(ret);
3814                 goto out;
3815         }
3816
3817         xh = bucket_xh(search);
3818         high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3819         while (low_bucket <= high_bucket) {
3820                 ocfs2_xattr_bucket_relse(search);
3821
3822                 bucket = (low_bucket + high_bucket) / 2;
3823                 blkno = p_blkno + bucket * blk_per_bucket;
3824                 ret = ocfs2_read_xattr_bucket(search, blkno);
3825                 if (ret) {
3826                         mlog_errno(ret);
3827                         goto out;
3828                 }
3829
3830                 xh = bucket_xh(search);
3831                 xe = &xh->xh_entries[0];
3832                 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3833                         high_bucket = bucket - 1;
3834                         continue;
3835                 }
3836
3837                 /*
3838                  * Check whether the hash of the last entry in our
3839                  * bucket is larger than the search one. for an empty
3840                  * bucket, the last one is also the first one.
3841                  */
3842                 if (xh->xh_count)
3843                         xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3844
3845                 last_hash = le32_to_cpu(xe->xe_name_hash);
3846
3847                 /* record lower_blkno which may be the insert place. */
3848                 lower_blkno = blkno;
3849
3850                 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3851                         low_bucket = bucket + 1;
3852                         continue;
3853                 }
3854
3855                 /* the searched xattr should reside in this bucket if exists. */
3856                 ret = ocfs2_find_xe_in_bucket(inode, search,
3857                                               name_index, name, name_hash,
3858                                               &index, &found);
3859                 if (ret) {
3860                         mlog_errno(ret);
3861                         goto out;
3862                 }
3863                 break;
3864         }
3865
3866         /*
3867          * Record the bucket we have found.
3868          * When the xattr's hash value is in the gap of 2 buckets, we will
3869          * always set it to the previous bucket.
3870          */
3871         if (!lower_blkno)
3872                 lower_blkno = p_blkno;
3873
3874         /* This should be in cache - we just read it during the search */
3875         ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3876         if (ret) {
3877                 mlog_errno(ret);
3878                 goto out;
3879         }
3880
3881         xs->header = bucket_xh(xs->bucket);
3882         xs->base = bucket_block(xs->bucket, 0);
3883         xs->end = xs->base + inode->i_sb->s_blocksize;
3884
3885         if (found) {
3886                 xs->here = &xs->header->xh_entries[index];
3887                 trace_ocfs2_xattr_bucket_find(OCFS2_I(inode)->ip_blkno,
3888                         name, name_index, name_hash,
3889                         (unsigned long long)bucket_blkno(xs->bucket),
3890                         index);
3891         } else
3892                 ret = -ENODATA;
3893
3894 out:
3895         ocfs2_xattr_bucket_free(search);
3896         return ret;
3897 }
3898
3899 static int ocfs2_xattr_index_block_find(struct inode *inode,
3900                                         struct buffer_head *root_bh,
3901                                         int name_index,
3902                                         const char *name,
3903                                         struct ocfs2_xattr_search *xs)
3904 {
3905         int ret;
3906         struct ocfs2_xattr_block *xb =
3907                         (struct ocfs2_xattr_block *)root_bh->b_data;
3908         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3909         struct ocfs2_extent_list *el = &xb_root->xt_list;
3910         u64 p_blkno = 0;
3911         u32 first_hash, num_clusters = 0;
3912         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3913
3914         if (le16_to_cpu(el->l_next_free_rec) == 0)
3915                 return -ENODATA;
3916
3917         trace_ocfs2_xattr_index_block_find(OCFS2_I(inode)->ip_blkno,
3918                                         name, name_index, name_hash,
3919                                         (unsigned long long)root_bh->b_blocknr,
3920                                         -1);
3921
3922         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3923                                   &num_clusters, el);
3924         if (ret) {
3925                 mlog_errno(ret);
3926                 goto out;
3927         }
3928
3929         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3930
3931         trace_ocfs2_xattr_index_block_find_rec(OCFS2_I(inode)->ip_blkno,
3932                                         name, name_index, first_hash,
3933                                         (unsigned long long)p_blkno,
3934                                         num_clusters);
3935
3936         ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3937                                       p_blkno, first_hash, num_clusters, xs);
3938
3939 out:
3940         return ret;
3941 }
3942
3943 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3944                                        u64 blkno,
3945                                        u32 clusters,
3946                                        xattr_bucket_func *func,
3947                                        void *para)
3948 {
3949         int i, ret = 0;
3950         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3951         u32 num_buckets = clusters * bpc;
3952         struct ocfs2_xattr_bucket *bucket;
3953
3954         bucket = ocfs2_xattr_bucket_new(inode);
3955         if (!bucket) {
3956                 mlog_errno(-ENOMEM);
3957                 return -ENOMEM;
3958         }
3959
3960         trace_ocfs2_iterate_xattr_buckets(
3961                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
3962                 (unsigned long long)blkno, clusters);
3963
3964         for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3965                 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3966                 if (ret) {
3967                         mlog_errno(ret);
3968                         break;
3969                 }
3970
3971                 /*
3972                  * The real bucket num in this series of blocks is stored
3973                  * in the 1st bucket.
3974                  */
3975                 if (i == 0)
3976                         num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3977
3978                 trace_ocfs2_iterate_xattr_bucket((unsigned long long)blkno,
3979                      le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3980                 if (func) {
3981                         ret = func(inode, bucket, para);
3982                         if (ret && ret != -ERANGE)
3983                                 mlog_errno(ret);
3984                         /* Fall through to bucket_relse() */
3985                 }
3986
3987                 ocfs2_xattr_bucket_relse(bucket);
3988                 if (ret)
3989                         break;
3990         }
3991
3992         ocfs2_xattr_bucket_free(bucket);
3993         return ret;
3994 }
3995
3996 struct ocfs2_xattr_tree_list {
3997         char *buffer;
3998         size_t buffer_size;
3999         size_t result;
4000 };
4001
4002 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
4003                                              struct ocfs2_xattr_header *xh,
4004                                              int index,
4005                                              int *block_off,
4006                                              int *new_offset)
4007 {
4008         u16 name_offset;
4009
4010         if (index < 0 || index >= le16_to_cpu(xh->xh_count))
4011                 return -EINVAL;
4012
4013         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
4014
4015         *block_off = name_offset >> sb->s_blocksize_bits;
4016         *new_offset = name_offset % sb->s_blocksize;
4017
4018         return 0;
4019 }
4020
4021 static int ocfs2_list_xattr_bucket(struct inode *inode,
4022                                    struct ocfs2_xattr_bucket *bucket,
4023                                    void *para)
4024 {
4025         int ret = 0, type;
4026         struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
4027         int i, block_off, new_offset;
4028         const char *prefix, *name;
4029
4030         for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
4031                 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
4032                 type = ocfs2_xattr_get_type(entry);
4033                 prefix = ocfs2_xattr_prefix(type);
4034
4035                 if (prefix) {
4036                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
4037                                                                 bucket_xh(bucket),
4038                                                                 i,
4039                                                                 &block_off,
4040                                                                 &new_offset);
4041                         if (ret)
4042                                 break;
4043
4044                         name = (const char *)bucket_block(bucket, block_off) +
4045                                 new_offset;
4046                         ret = ocfs2_xattr_list_entry(xl->buffer,
4047                                                      xl->buffer_size,
4048                                                      &xl->result,
4049                                                      prefix, name,
4050                                                      entry->xe_name_len);
4051                         if (ret)
4052                                 break;
4053                 }
4054         }
4055
4056         return ret;
4057 }
4058
4059 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
4060                                            struct buffer_head *blk_bh,
4061                                            xattr_tree_rec_func *rec_func,
4062                                            void *para)
4063 {
4064         struct ocfs2_xattr_block *xb =
4065                         (struct ocfs2_xattr_block *)blk_bh->b_data;
4066         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4067         int ret = 0;
4068         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
4069         u64 p_blkno = 0;
4070
4071         if (!el->l_next_free_rec || !rec_func)
4072                 return 0;
4073
4074         while (name_hash > 0) {
4075                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4076                                           &e_cpos, &num_clusters, el);
4077                 if (ret) {
4078                         mlog_errno(ret);
4079                         break;
4080                 }
4081
4082                 ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
4083                                num_clusters, para);
4084                 if (ret) {
4085                         if (ret != -ERANGE)
4086                                 mlog_errno(ret);
4087                         break;
4088                 }
4089
4090                 if (e_cpos == 0)
4091                         break;
4092
4093                 name_hash = e_cpos - 1;
4094         }
4095
4096         return ret;
4097
4098 }
4099
4100 static int ocfs2_list_xattr_tree_rec(struct inode *inode,
4101                                      struct buffer_head *root_bh,
4102                                      u64 blkno, u32 cpos, u32 len, void *para)
4103 {
4104         return ocfs2_iterate_xattr_buckets(inode, blkno, len,
4105                                            ocfs2_list_xattr_bucket, para);
4106 }
4107
4108 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
4109                                              struct buffer_head *blk_bh,
4110                                              char *buffer,
4111                                              size_t buffer_size)
4112 {
4113         int ret;
4114         struct ocfs2_xattr_tree_list xl = {
4115                 .buffer = buffer,
4116                 .buffer_size = buffer_size,
4117                 .result = 0,
4118         };
4119
4120         ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
4121                                               ocfs2_list_xattr_tree_rec, &xl);
4122         if (ret) {
4123                 mlog_errno(ret);
4124                 goto out;
4125         }
4126
4127         ret = xl.result;
4128 out:
4129         return ret;
4130 }
4131
4132 static int cmp_xe(const void *a, const void *b)
4133 {
4134         const struct ocfs2_xattr_entry *l = a, *r = b;
4135         u32 l_hash = le32_to_cpu(l->xe_name_hash);
4136         u32 r_hash = le32_to_cpu(r->xe_name_hash);
4137
4138         if (l_hash > r_hash)
4139                 return 1;
4140         if (l_hash < r_hash)
4141                 return -1;
4142         return 0;
4143 }
4144
4145 static void swap_xe(void *a, void *b, int size)
4146 {
4147         struct ocfs2_xattr_entry *l = a, *r = b, tmp;
4148
4149         tmp = *l;
4150         memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
4151         memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
4152 }
4153
4154 /*
4155  * When the ocfs2_xattr_block is filled up, new bucket will be created
4156  * and all the xattr entries will be moved to the new bucket.
4157  * The header goes at the start of the bucket, and the names+values are
4158  * filled from the end.  This is why *target starts as the last buffer.
4159  * Note: we need to sort the entries since they are not saved in order
4160  * in the ocfs2_xattr_block.
4161  */
4162 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
4163                                            struct buffer_head *xb_bh,
4164                                            struct ocfs2_xattr_bucket *bucket)
4165 {
4166         int i, blocksize = inode->i_sb->s_blocksize;
4167         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4168         u16 offset, size, off_change;
4169         struct ocfs2_xattr_entry *xe;
4170         struct ocfs2_xattr_block *xb =
4171                                 (struct ocfs2_xattr_block *)xb_bh->b_data;
4172         struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
4173         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4174         u16 count = le16_to_cpu(xb_xh->xh_count);
4175         char *src = xb_bh->b_data;
4176         char *target = bucket_block(bucket, blks - 1);
4177
4178         trace_ocfs2_cp_xattr_block_to_bucket_begin(
4179                                 (unsigned long long)xb_bh->b_blocknr,
4180                                 (unsigned long long)bucket_blkno(bucket));
4181
4182         for (i = 0; i < blks; i++)
4183                 memset(bucket_block(bucket, i), 0, blocksize);
4184
4185         /*
4186          * Since the xe_name_offset is based on ocfs2_xattr_header,
4187          * there is a offset change corresponding to the change of
4188          * ocfs2_xattr_header's position.
4189          */
4190         off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4191         xe = &xb_xh->xh_entries[count - 1];
4192         offset = le16_to_cpu(xe->xe_name_offset) + off_change;
4193         size = blocksize - offset;
4194
4195         /* copy all the names and values. */
4196         memcpy(target + offset, src + offset, size);
4197
4198         /* Init new header now. */
4199         xh->xh_count = xb_xh->xh_count;
4200         xh->xh_num_buckets = cpu_to_le16(1);
4201         xh->xh_name_value_len = cpu_to_le16(size);
4202         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
4203
4204         /* copy all the entries. */
4205         target = bucket_block(bucket, 0);
4206         offset = offsetof(struct ocfs2_xattr_header, xh_entries);
4207         size = count * sizeof(struct ocfs2_xattr_entry);
4208         memcpy(target + offset, (char *)xb_xh + offset, size);
4209
4210         /* Change the xe offset for all the xe because of the move. */
4211         off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
4212                  offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4213         for (i = 0; i < count; i++)
4214                 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
4215
4216         trace_ocfs2_cp_xattr_block_to_bucket_end(offset, size, off_change);
4217
4218         sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
4219              cmp_xe, swap_xe);
4220 }
4221
4222 /*
4223  * After we move xattr from block to index btree, we have to
4224  * update ocfs2_xattr_search to the new xe and base.
4225  *
4226  * When the entry is in xattr block, xattr_bh indicates the storage place.
4227  * While if the entry is in index b-tree, "bucket" indicates the
4228  * real place of the xattr.
4229  */
4230 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
4231                                             struct ocfs2_xattr_search *xs,
4232                                             struct buffer_head *old_bh)
4233 {
4234         char *buf = old_bh->b_data;
4235         struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
4236         struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
4237         int i;
4238
4239         xs->header = bucket_xh(xs->bucket);
4240         xs->base = bucket_block(xs->bucket, 0);
4241         xs->end = xs->base + inode->i_sb->s_blocksize;
4242
4243         if (xs->not_found)
4244                 return;
4245
4246         i = xs->here - old_xh->xh_entries;
4247         xs->here = &xs->header->xh_entries[i];
4248 }
4249
4250 static int ocfs2_xattr_create_index_block(struct inode *inode,
4251                                           struct ocfs2_xattr_search *xs,
4252                                           struct ocfs2_xattr_set_ctxt *ctxt)
4253 {
4254         int ret;
4255         u32 bit_off, len;
4256         u64 blkno;
4257         handle_t *handle = ctxt->handle;
4258         struct ocfs2_inode_info *oi = OCFS2_I(inode);
4259         struct buffer_head *xb_bh = xs->xattr_bh;
4260         struct ocfs2_xattr_block *xb =
4261                         (struct ocfs2_xattr_block *)xb_bh->b_data;
4262         struct ocfs2_xattr_tree_root *xr;
4263         u16 xb_flags = le16_to_cpu(xb->xb_flags);
4264
4265         trace_ocfs2_xattr_create_index_block_begin(
4266                                 (unsigned long long)xb_bh->b_blocknr);
4267
4268         BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
4269         BUG_ON(!xs->bucket);
4270
4271         /*
4272          * XXX:
4273          * We can use this lock for now, and maybe move to a dedicated mutex
4274          * if performance becomes a problem later.
4275          */
4276         down_write(&oi->ip_alloc_sem);
4277
4278         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
4279                                       OCFS2_JOURNAL_ACCESS_WRITE);
4280         if (ret) {
4281                 mlog_errno(ret);
4282                 goto out;
4283         }
4284
4285         ret = __ocfs2_claim_clusters(handle, ctxt->data_ac,
4286                                      1, 1, &bit_off, &len);
4287         if (ret) {
4288                 mlog_errno(ret);
4289                 goto out;
4290         }
4291
4292         /*
4293          * The bucket may spread in many blocks, and
4294          * we will only touch the 1st block and the last block
4295          * in the whole bucket(one for entry and one for data).
4296          */
4297         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
4298
4299         trace_ocfs2_xattr_create_index_block((unsigned long long)blkno);
4300
4301         ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
4302         if (ret) {
4303                 mlog_errno(ret);
4304                 goto out;
4305         }
4306
4307         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4308                                                 OCFS2_JOURNAL_ACCESS_CREATE);
4309         if (ret) {
4310                 mlog_errno(ret);
4311                 goto out;
4312         }
4313
4314         ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
4315         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4316
4317         ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
4318
4319         /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
4320         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
4321                offsetof(struct ocfs2_xattr_block, xb_attrs));
4322
4323         xr = &xb->xb_attrs.xb_root;
4324         xr->xt_clusters = cpu_to_le32(1);
4325         xr->xt_last_eb_blk = 0;
4326         xr->xt_list.l_tree_depth = 0;
4327         xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
4328         xr->xt_list.l_next_free_rec = cpu_to_le16(1);
4329
4330         xr->xt_list.l_recs[0].e_cpos = 0;
4331         xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
4332         xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
4333
4334         xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
4335
4336         ocfs2_journal_dirty(handle, xb_bh);
4337
4338 out:
4339         up_write(&oi->ip_alloc_sem);
4340
4341         return ret;
4342 }
4343
4344 static int cmp_xe_offset(const void *a, const void *b)
4345 {
4346         const struct ocfs2_xattr_entry *l = a, *r = b;
4347         u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
4348         u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
4349
4350         if (l_name_offset < r_name_offset)
4351                 return 1;
4352         if (l_name_offset > r_name_offset)
4353                 return -1;
4354         return 0;
4355 }
4356
4357 /*
4358  * defrag a xattr bucket if we find that the bucket has some
4359  * holes beteen name/value pairs.
4360  * We will move all the name/value pairs to the end of the bucket
4361  * so that we can spare some space for insertion.
4362  */
4363 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
4364                                      handle_t *handle,
4365                                      struct ocfs2_xattr_bucket *bucket)
4366 {
4367         int ret, i;
4368         size_t end, offset, len;
4369         struct ocfs2_xattr_header *xh;
4370         char *entries, *buf, *bucket_buf = NULL;
4371         u64 blkno = bucket_blkno(bucket);
4372         u16 xh_free_start;
4373         size_t blocksize = inode->i_sb->s_blocksize;
4374         struct ocfs2_xattr_entry *xe;
4375
4376         /*
4377          * In order to make the operation more efficient and generic,
4378          * we copy all the blocks into a contiguous memory and do the
4379          * defragment there, so if anything is error, we will not touch
4380          * the real block.
4381          */
4382         bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
4383         if (!bucket_buf) {
4384                 ret = -EIO;
4385                 goto out;
4386         }
4387
4388         buf = bucket_buf;
4389         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4390                 memcpy(buf, bucket_block(bucket, i), blocksize);
4391
4392         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
4393                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4394         if (ret < 0) {
4395                 mlog_errno(ret);
4396                 goto out;
4397         }
4398
4399         xh = (struct ocfs2_xattr_header *)bucket_buf;
4400         entries = (char *)xh->xh_entries;
4401         xh_free_start = le16_to_cpu(xh->xh_free_start);
4402
4403         trace_ocfs2_defrag_xattr_bucket(
4404              (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
4405              xh_free_start, le16_to_cpu(xh->xh_name_value_len));
4406
4407         /*
4408          * sort all the entries by their offset.
4409          * the largest will be the first, so that we can
4410          * move them to the end one by one.
4411          */
4412         sort(entries, le16_to_cpu(xh->xh_count),
4413              sizeof(struct ocfs2_xattr_entry),
4414              cmp_xe_offset, swap_xe);
4415
4416         /* Move all name/values to the end of the bucket. */
4417         xe = xh->xh_entries;
4418         end = OCFS2_XATTR_BUCKET_SIZE;
4419         for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
4420                 offset = le16_to_cpu(xe->xe_name_offset);
4421                 len = namevalue_size_xe(xe);
4422
4423                 /*
4424                  * We must make sure that the name/value pair
4425                  * exist in the same block. So adjust end to
4426                  * the previous block end if needed.
4427                  */
4428                 if (((end - len) / blocksize !=
4429                         (end - 1) / blocksize))
4430                         end = end - end % blocksize;
4431
4432                 if (end > offset + len) {
4433                         memmove(bucket_buf + end - len,
4434                                 bucket_buf + offset, len);
4435                         xe->xe_name_offset = cpu_to_le16(end - len);
4436                 }
4437
4438                 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
4439                                 "bucket %llu\n", (unsigned long long)blkno);
4440
4441                 end -= len;
4442         }
4443
4444         mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
4445                         "bucket %llu\n", (unsigned long long)blkno);
4446
4447         if (xh_free_start == end)
4448                 goto out;
4449
4450         memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
4451         xh->xh_free_start = cpu_to_le16(end);
4452
4453         /* sort the entries by their name_hash. */
4454         sort(entries, le16_to_cpu(xh->xh_count),
4455              sizeof(struct ocfs2_xattr_entry),
4456              cmp_xe, swap_xe);
4457
4458         buf = bucket_buf;
4459         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4460                 memcpy(bucket_block(bucket, i), buf, blocksize);
4461         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
4462
4463 out:
4464         kfree(bucket_buf);
4465         return ret;
4466 }
4467
4468 /*
4469  * prev_blkno points to the start of an existing extent.  new_blkno
4470  * points to a newly allocated extent.  Because we know each of our
4471  * clusters contains more than bucket, we can easily split one cluster
4472  * at a bucket boundary.  So we take the last cluster of the existing
4473  * extent and split it down the middle.  We move the last half of the
4474  * buckets in the last cluster of the existing extent over to the new
4475  * extent.
4476  *
4477  * first_bh is the buffer at prev_blkno so we can update the existing
4478  * extent's bucket count.  header_bh is the bucket were we were hoping
4479  * to insert our xattr.  If the bucket move places the target in the new
4480  * extent, we'll update first_bh and header_bh after modifying the old
4481  * extent.
4482  *
4483  * first_hash will be set as the 1st xe's name_hash in the new extent.
4484  */
4485 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
4486                                                handle_t *handle,
4487                                                struct ocfs2_xattr_bucket *first,
4488                                                struct ocfs2_xattr_bucket *target,
4489                                                u64 new_blkno,
4490                                                u32 num_clusters,
4491                                                u32 *first_hash)
4492 {
4493         int ret;
4494         struct super_block *sb = inode->i_sb;
4495         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
4496         int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
4497         int to_move = num_buckets / 2;
4498         u64 src_blkno;
4499         u64 last_cluster_blkno = bucket_blkno(first) +
4500                 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
4501
4502         BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
4503         BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
4504
4505         trace_ocfs2_mv_xattr_bucket_cross_cluster(
4506                                 (unsigned long long)last_cluster_blkno,
4507                                 (unsigned long long)new_blkno);
4508
4509         ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
4510                                      last_cluster_blkno, new_blkno,
4511                                      to_move, first_hash);
4512         if (ret) {
4513                 mlog_errno(ret);
4514                 goto out;
4515         }
4516
4517         /* This is the first bucket that got moved */
4518         src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
4519
4520         /*
4521          * If the target bucket was part of the moved buckets, we need to
4522          * update first and target.
4523          */
4524         if (bucket_blkno(target) >= src_blkno) {
4525                 /* Find the block for the new target bucket */
4526                 src_blkno = new_blkno +
4527                         (bucket_blkno(target) - src_blkno);
4528
4529                 ocfs2_xattr_bucket_relse(first);
4530                 ocfs2_xattr_bucket_relse(target);
4531
4532                 /*
4533                  * These shouldn't fail - the buffers are in the
4534                  * journal from ocfs2_cp_xattr_bucket().
4535                  */
4536                 ret = ocfs2_read_xattr_bucket(first, new_blkno);
4537                 if (ret) {
4538                         mlog_errno(ret);
4539                         goto out;
4540                 }
4541                 ret = ocfs2_read_xattr_bucket(target, src_blkno);
4542                 if (ret)
4543                         mlog_errno(ret);
4544
4545         }
4546
4547 out:
4548         return ret;
4549 }
4550
4551 /*
4552  * Find the suitable pos when we divide a bucket into 2.
4553  * We have to make sure the xattrs with the same hash value exist
4554  * in the same bucket.
4555  *
4556  * If this ocfs2_xattr_header covers more than one hash value, find a
4557  * place where the hash value changes.  Try to find the most even split.
4558  * The most common case is that all entries have different hash values,
4559  * and the first check we make will find a place to split.
4560  */
4561 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
4562 {
4563         struct ocfs2_xattr_entry *entries = xh->xh_entries;
4564         int count = le16_to_cpu(xh->xh_count);
4565         int delta, middle = count / 2;
4566
4567         /*
4568          * We start at the middle.  Each step gets farther away in both
4569          * directions.  We therefore hit the change in hash value
4570          * nearest to the middle.  Note that this loop does not execute for
4571          * count < 2.
4572          */
4573         for (delta = 0; delta < middle; delta++) {
4574                 /* Let's check delta earlier than middle */
4575                 if (cmp_xe(&entries[middle - delta - 1],
4576                            &entries[middle - delta]))
4577                         return middle - delta;
4578
4579                 /* For even counts, don't walk off the end */
4580                 if ((middle + delta + 1) == count)
4581                         continue;
4582
4583                 /* Now try delta past middle */
4584                 if (cmp_xe(&entries[middle + delta],
4585                            &entries[middle + delta + 1]))
4586                         return middle + delta + 1;
4587         }
4588
4589         /* Every entry had the same hash */
4590         return count;
4591 }
4592
4593 /*
4594  * Move some xattrs in old bucket(blk) to new bucket(new_blk).
4595  * first_hash will record the 1st hash of the new bucket.
4596  *
4597  * Normally half of the xattrs will be moved.  But we have to make
4598  * sure that the xattrs with the same hash value are stored in the
4599  * same bucket. If all the xattrs in this bucket have the same hash
4600  * value, the new bucket will be initialized as an empty one and the
4601  * first_hash will be initialized as (hash_value+1).
4602  */
4603 static int ocfs2_divide_xattr_bucket(struct inode *inode,
4604                                     handle_t *handle,
4605                                     u64 blk,
4606                                     u64 new_blk,
4607                                     u32 *first_hash,
4608                                     int new_bucket_head)
4609 {
4610         int ret, i;
4611         int count, start, len, name_value_len = 0, name_offset = 0;
4612         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4613         struct ocfs2_xattr_header *xh;
4614         struct ocfs2_xattr_entry *xe;
4615         int blocksize = inode->i_sb->s_blocksize;
4616
4617         trace_ocfs2_divide_xattr_bucket_begin((unsigned long long)blk,
4618                                               (unsigned long long)new_blk);
4619
4620         s_bucket = ocfs2_xattr_bucket_new(inode);
4621         t_bucket = ocfs2_xattr_bucket_new(inode);
4622         if (!s_bucket || !t_bucket) {
4623                 ret = -ENOMEM;
4624                 mlog_errno(ret);
4625                 goto out;
4626         }
4627
4628         ret = ocfs2_read_xattr_bucket(s_bucket, blk);
4629         if (ret) {
4630                 mlog_errno(ret);
4631                 goto out;
4632         }
4633
4634         ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
4635                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4636         if (ret) {
4637                 mlog_errno(ret);
4638                 goto out;
4639         }
4640
4641         /*
4642          * Even if !new_bucket_head, we're overwriting t_bucket.  Thus,
4643          * there's no need to read it.
4644          */
4645         ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
4646         if (ret) {
4647                 mlog_errno(ret);
4648                 goto out;
4649         }
4650
4651         /*
4652          * Hey, if we're overwriting t_bucket, what difference does
4653          * ACCESS_CREATE vs ACCESS_WRITE make?  See the comment in the
4654          * same part of ocfs2_cp_xattr_bucket().
4655          */
4656         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4657                                                 new_bucket_head ?
4658                                                 OCFS2_JOURNAL_ACCESS_CREATE :
4659                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4660         if (ret) {
4661                 mlog_errno(ret);
4662                 goto out;
4663         }
4664
4665         xh = bucket_xh(s_bucket);
4666         count = le16_to_cpu(xh->xh_count);
4667         start = ocfs2_xattr_find_divide_pos(xh);
4668
4669         if (start == count) {
4670                 xe = &xh->xh_entries[start-1];
4671
4672                 /*
4673                  * initialized a new empty bucket here.
4674                  * The hash value is set as one larger than
4675                  * that of the last entry in the previous bucket.
4676                  */
4677                 for (i = 0; i < t_bucket->bu_blocks; i++)
4678                         memset(bucket_block(t_bucket, i), 0, blocksize);
4679
4680                 xh = bucket_xh(t_bucket);
4681                 xh->xh_free_start = cpu_to_le16(blocksize);
4682                 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
4683                 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
4684
4685                 goto set_num_buckets;
4686         }
4687
4688         /* copy the whole bucket to the new first. */
4689         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4690
4691         /* update the new bucket. */
4692         xh = bucket_xh(t_bucket);
4693
4694         /*
4695          * Calculate the total name/value len and xh_free_start for
4696          * the old bucket first.
4697          */
4698         name_offset = OCFS2_XATTR_BUCKET_SIZE;
4699         name_value_len = 0;
4700         for (i = 0; i < start; i++) {
4701                 xe = &xh->xh_entries[i];
4702                 name_value_len += namevalue_size_xe(xe);
4703                 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
4704                         name_offset = le16_to_cpu(xe->xe_name_offset);
4705         }
4706
4707         /*
4708          * Now begin the modification to the new bucket.
4709          *
4710          * In the new bucket, We just move the xattr entry to the beginning
4711          * and don't touch the name/value. So there will be some holes in the
4712          * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
4713          * called.
4714          */
4715         xe = &xh->xh_entries[start];
4716         len = sizeof(struct ocfs2_xattr_entry) * (count - start);
4717         trace_ocfs2_divide_xattr_bucket_move(len,
4718                         (int)((char *)xe - (char *)xh),
4719                         (int)((char *)xh->xh_entries - (char *)xh));
4720         memmove((char *)xh->xh_entries, (char *)xe, len);
4721         xe = &xh->xh_entries[count - start];
4722         len = sizeof(struct ocfs2_xattr_entry) * start;
4723         memset((char *)xe, 0, len);
4724
4725         le16_add_cpu(&xh->xh_count, -start);
4726         le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
4727
4728         /* Calculate xh_free_start for the new bucket. */
4729         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4730         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4731                 xe = &xh->xh_entries[i];
4732                 if (le16_to_cpu(xe->xe_name_offset) <
4733                     le16_to_cpu(xh->xh_free_start))
4734                         xh->xh_free_start = xe->xe_name_offset;
4735         }
4736
4737 set_num_buckets:
4738         /* set xh->xh_num_buckets for the new xh. */
4739         if (new_bucket_head)
4740                 xh->xh_num_buckets = cpu_to_le16(1);
4741         else
4742                 xh->xh_num_buckets = 0;
4743
4744         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4745
4746         /* store the first_hash of the new bucket. */
4747         if (first_hash)
4748                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4749
4750         /*
4751          * Now only update the 1st block of the old bucket.  If we
4752          * just added a new empty bucket, there is no need to modify
4753          * it.
4754          */
4755         if (start == count)
4756                 goto out;
4757
4758         xh = bucket_xh(s_bucket);
4759         memset(&xh->xh_entries[start], 0,
4760                sizeof(struct ocfs2_xattr_entry) * (count - start));
4761         xh->xh_count = cpu_to_le16(start);
4762         xh->xh_free_start = cpu_to_le16(name_offset);
4763         xh->xh_name_value_len = cpu_to_le16(name_value_len);
4764
4765         ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4766
4767 out:
4768         ocfs2_xattr_bucket_free(s_bucket);
4769         ocfs2_xattr_bucket_free(t_bucket);
4770
4771         return ret;
4772 }
4773
4774 /*
4775  * Copy xattr from one bucket to another bucket.
4776  *
4777  * The caller must make sure that the journal transaction
4778  * has enough space for journaling.
4779  */
4780 static int ocfs2_cp_xattr_bucket(struct inode *inode,
4781                                  handle_t *handle,
4782                                  u64 s_blkno,
4783                                  u64 t_blkno,
4784                                  int t_is_new)
4785 {
4786         int ret;
4787         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4788
4789         BUG_ON(s_blkno == t_blkno);
4790
4791         trace_ocfs2_cp_xattr_bucket((unsigned long long)s_blkno,
4792                                     (unsigned long long)t_blkno,
4793                                     t_is_new);
4794
4795         s_bucket = ocfs2_xattr_bucket_new(inode);
4796         t_bucket = ocfs2_xattr_bucket_new(inode);
4797         if (!s_bucket || !t_bucket) {
4798                 ret = -ENOMEM;
4799                 mlog_errno(ret);
4800                 goto out;
4801         }
4802
4803         ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4804         if (ret)
4805                 goto out;
4806
4807         /*
4808          * Even if !t_is_new, we're overwriting t_bucket.  Thus,
4809          * there's no need to read it.
4810          */
4811         ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
4812         if (ret)
4813                 goto out;
4814
4815         /*
4816          * Hey, if we're overwriting t_bucket, what difference does
4817          * ACCESS_CREATE vs ACCESS_WRITE make?  Well, if we allocated a new
4818          * cluster to fill, we came here from
4819          * ocfs2_mv_xattr_buckets(), and it is really new -
4820          * ACCESS_CREATE is required.  But we also might have moved data
4821          * out of t_bucket before extending back into it.
4822          * ocfs2_add_new_xattr_bucket() can do this - its call to
4823          * ocfs2_add_new_xattr_cluster() may have created a new extent
4824          * and copied out the end of the old extent.  Then it re-extends
4825          * the old extent back to create space for new xattrs.  That's
4826          * how we get here, and the bucket isn't really new.
4827          */
4828         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4829                                                 t_is_new ?
4830                                                 OCFS2_JOURNAL_ACCESS_CREATE :
4831                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4832         if (ret)
4833                 goto out;
4834
4835         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4836         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4837
4838 out:
4839         ocfs2_xattr_bucket_free(t_bucket);
4840         ocfs2_xattr_bucket_free(s_bucket);
4841
4842         return ret;
4843 }
4844
4845 /*
4846  * src_blk points to the start of an existing extent.  last_blk points to
4847  * last cluster in that extent.  to_blk points to a newly allocated
4848  * extent.  We copy the buckets from the cluster at last_blk to the new
4849  * extent.  If start_bucket is non-zero, we skip that many buckets before
4850  * we start copying.  The new extent's xh_num_buckets gets set to the
4851  * number of buckets we copied.  The old extent's xh_num_buckets shrinks
4852  * by the same amount.
4853  */
4854 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4855                                   u64 src_blk, u64 last_blk, u64 to_blk,
4856                                   unsigned int start_bucket,
4857                                   u32 *first_hash)
4858 {
4859         int i, ret, credits;
4860         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4861         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4862         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4863         struct ocfs2_xattr_bucket *old_first, *new_first;
4864
4865         trace_ocfs2_mv_xattr_buckets((unsigned long long)last_blk,
4866                                      (unsigned long long)to_blk);
4867
4868         BUG_ON(start_bucket >= num_buckets);
4869         if (start_bucket) {
4870                 num_buckets -= start_bucket;
4871                 last_blk += (start_bucket * blks_per_bucket);
4872         }
4873
4874         /* The first bucket of the original extent */
4875         old_first = ocfs2_xattr_bucket_new(inode);
4876         /* The first bucket of the new extent */
4877         new_first = ocfs2_xattr_bucket_new(inode);
4878         if (!old_first || !new_first) {
4879                 ret = -ENOMEM;
4880                 mlog_errno(ret);
4881                 goto out;
4882         }
4883
4884         ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4885         if (ret) {
4886                 mlog_errno(ret);
4887                 goto out;
4888         }
4889
4890         /*
4891          * We need to update the first bucket of the old extent and all
4892          * the buckets going to the new extent.
4893          */
4894         credits = ((num_buckets + 1) * blks_per_bucket);
4895         ret = ocfs2_extend_trans(handle, credits);
4896         if (ret) {
4897                 mlog_errno(ret);
4898                 goto out;
4899         }
4900
4901         ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4902                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4903         if (ret) {
4904                 mlog_errno(ret);
4905                 goto out;
4906         }
4907
4908         for (i = 0; i < num_buckets; i++) {
4909                 ret = ocfs2_cp_xattr_bucket(inode, handle,
4910                                             last_blk + (i * blks_per_bucket),
4911                                             to_blk + (i * blks_per_bucket),
4912                                             1);
4913                 if (ret) {
4914                         mlog_errno(ret);
4915                         goto out;
4916                 }
4917         }
4918
4919         /*
4920          * Get the new bucket ready before we dirty anything
4921          * (This actually shouldn't fail, because we already dirtied
4922          * it once in ocfs2_cp_xattr_bucket()).
4923          */
4924         ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4925         if (ret) {
4926                 mlog_errno(ret);
4927                 goto out;
4928         }
4929         ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4930                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4931         if (ret) {
4932                 mlog_errno(ret);
4933                 goto out;
4934         }
4935
4936         /* Now update the headers */
4937         le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4938         ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4939
4940         bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4941         ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4942
4943         if (first_hash)
4944                 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4945
4946 out:
4947         ocfs2_xattr_bucket_free(new_first);
4948         ocfs2_xattr_bucket_free(old_first);
4949         return ret;
4950 }
4951
4952 /*
4953  * Move some xattrs in this cluster to the new cluster.
4954  * This function should only be called when bucket size == cluster size.
4955  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4956  */
4957 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4958                                       handle_t *handle,
4959                                       u64 prev_blk,
4960                                       u64 new_blk,
4961                                       u32 *first_hash)
4962 {
4963         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4964         int ret, credits = 2 * blk_per_bucket;
4965
4966         BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4967
4968         ret = ocfs2_extend_trans(handle, credits);
4969         if (ret) {
4970                 mlog_errno(ret);
4971                 return ret;
4972         }
4973
4974         /* Move half of the xattr in start_blk to the next bucket. */
4975         return  ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4976                                           new_blk, first_hash, 1);
4977 }
4978
4979 /*
4980  * Move some xattrs from the old cluster to the new one since they are not
4981  * contiguous in ocfs2 xattr tree.
4982  *
4983  * new_blk starts a new separate cluster, and we will move some xattrs from
4984  * prev_blk to it. v_start will be set as the first name hash value in this
4985  * new cluster so that it can be used as e_cpos during tree insertion and
4986  * don't collide with our original b-tree operations. first_bh and header_bh
4987  * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4988  * to extend the insert bucket.
4989  *
4990  * The problem is how much xattr should we move to the new one and when should
4991  * we update first_bh and header_bh?
4992  * 1. If cluster size > bucket size, that means the previous cluster has more
4993  *    than 1 bucket, so just move half nums of bucket into the new cluster and
4994  *    update the first_bh and header_bh if the insert bucket has been moved
4995  *    to the new cluster.
4996  * 2. If cluster_size == bucket_size:
4997  *    a) If the previous extent rec has more than one cluster and the insert
4998  *       place isn't in the last cluster, copy the entire last cluster to the
4999  *       new one. This time, we don't need to upate the first_bh and header_bh
5000  *       since they will not be moved into the new cluster.
5001  *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
5002  *       the new one. And we set the extend flag to zero if the insert place is
5003  *       moved into the new allocated cluster since no extend is needed.
5004  */
5005 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
5006                                             handle_t *handle,
5007                                             struct ocfs2_xattr_bucket *first,
5008                                             struct ocfs2_xattr_bucket *target,
5009                                             u64 new_blk,
5010                                             u32 prev_clusters,
5011                                             u32 *v_start,
5012                                             int *extend)
5013 {
5014         int ret;
5015
5016         trace_ocfs2_adjust_xattr_cross_cluster(
5017                         (unsigned long long)bucket_blkno(first),
5018                         (unsigned long long)new_blk, prev_clusters);
5019
5020         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
5021                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
5022                                                           handle,
5023                                                           first, target,
5024                                                           new_blk,
5025                                                           prev_clusters,
5026                                                           v_start);
5027                 if (ret)
5028                         mlog_errno(ret);
5029         } else {
5030                 /* The start of the last cluster in the first extent */
5031                 u64 last_blk = bucket_blkno(first) +
5032                         ((prev_clusters - 1) *
5033                          ocfs2_clusters_to_blocks(inode->i_sb, 1));
5034
5035                 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
5036                         ret = ocfs2_mv_xattr_buckets(inode, handle,
5037                                                      bucket_blkno(first),
5038                                                      last_blk, new_blk, 0,
5039                                                      v_start);
5040                         if (ret)
5041                                 mlog_errno(ret);
5042                 } else {
5043                         ret = ocfs2_divide_xattr_cluster(inode, handle,
5044                                                          last_blk, new_blk,
5045                                                          v_start);
5046                         if (ret)
5047                                 mlog_errno(ret);
5048
5049                         if ((bucket_blkno(target) == last_blk) && extend)
5050                                 *extend = 0;
5051                 }
5052         }
5053
5054         return ret;
5055 }
5056
5057 /*
5058  * Add a new cluster for xattr storage.
5059  *
5060  * If the new cluster is contiguous with the previous one, it will be
5061  * appended to the same extent record, and num_clusters will be updated.
5062  * If not, we will insert a new extent for it and move some xattrs in
5063  * the last cluster into the new allocated one.
5064  * We also need to limit the maximum size of a btree leaf, otherwise we'll
5065  * lose the benefits of hashing because we'll have to search large leaves.
5066  * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
5067  * if it's bigger).
5068  *
5069  * first_bh is the first block of the previous extent rec and header_bh
5070  * indicates the bucket we will insert the new xattrs. They will be updated
5071  * when the header_bh is moved into the new cluster.
5072  */
5073 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
5074                                        struct buffer_head *root_bh,
5075                                        struct ocfs2_xattr_bucket *first,
5076                                        struct ocfs2_xattr_bucket *target,
5077                                        u32 *num_clusters,
5078                                        u32 prev_cpos,
5079                                        int *extend,
5080                                        struct ocfs2_xattr_set_ctxt *ctxt)
5081 {
5082         int ret;
5083         u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
5084         u32 prev_clusters = *num_clusters;
5085         u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
5086         u64 block;
5087         handle_t *handle = ctxt->handle;
5088         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5089         struct ocfs2_extent_tree et;
5090
5091         trace_ocfs2_add_new_xattr_cluster_begin(
5092                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
5093                 (unsigned long long)bucket_blkno(first),
5094                 prev_cpos, prev_clusters);
5095
5096         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5097
5098         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5099                                       OCFS2_JOURNAL_ACCESS_WRITE);
5100         if (ret < 0) {
5101                 mlog_errno(ret);
5102                 goto leave;
5103         }
5104
5105         ret = __ocfs2_claim_clusters(handle, ctxt->data_ac, 1,
5106                                      clusters_to_add, &bit_off, &num_bits);
5107         if (ret < 0) {
5108                 if (ret != -ENOSPC)
5109                         mlog_errno(ret);
5110                 goto leave;
5111         }
5112
5113         BUG_ON(num_bits > clusters_to_add);
5114
5115         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
5116         trace_ocfs2_add_new_xattr_cluster((unsigned long long)block, num_bits);
5117
5118         if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
5119             (prev_clusters + num_bits) << osb->s_clustersize_bits <=
5120              OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
5121                 /*
5122                  * If this cluster is contiguous with the old one and
5123                  * adding this new cluster, we don't surpass the limit of
5124                  * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
5125                  * initialized and used like other buckets in the previous
5126                  * cluster.
5127                  * So add it as a contiguous one. The caller will handle
5128                  * its init process.
5129                  */
5130                 v_start = prev_cpos + prev_clusters;
5131                 *num_clusters = prev_clusters + num_bits;
5132         } else {
5133                 ret = ocfs2_adjust_xattr_cross_cluster(inode,
5134                                                        handle,
5135                                                        first,
5136                                                        target,
5137                                                        block,
5138                                                        prev_clusters,
5139                                                        &v_start,
5140                                                        extend);
5141                 if (ret) {
5142                         mlog_errno(ret);
5143                         goto leave;
5144                 }
5145         }
5146
5147         trace_ocfs2_add_new_xattr_cluster_insert((unsigned long long)block,
5148                                                  v_start, num_bits);
5149         ret = ocfs2_insert_extent(handle, &et, v_start, block,
5150                                   num_bits, 0, ctxt->meta_ac);
5151         if (ret < 0) {
5152                 mlog_errno(ret);
5153                 goto leave;
5154         }
5155
5156         ocfs2_journal_dirty(handle, root_bh);
5157
5158 leave:
5159         return ret;
5160 }
5161
5162 /*
5163  * We are given an extent.  'first' is the bucket at the very front of
5164  * the extent.  The extent has space for an additional bucket past
5165  * bucket_xh(first)->xh_num_buckets.  'target_blkno' is the block number
5166  * of the target bucket.  We wish to shift every bucket past the target
5167  * down one, filling in that additional space.  When we get back to the
5168  * target, we split the target between itself and the now-empty bucket
5169  * at target+1 (aka, target_blkno + blks_per_bucket).
5170  */
5171 static int ocfs2_extend_xattr_bucket(struct inode *inode,
5172                                      handle_t *handle,
5173                                      struct ocfs2_xattr_bucket *first,
5174                                      u64 target_blk,
5175                                      u32 num_clusters)
5176 {
5177         int ret, credits;
5178         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5179         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5180         u64 end_blk;
5181         u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
5182
5183         trace_ocfs2_extend_xattr_bucket((unsigned long long)target_blk,
5184                                         (unsigned long long)bucket_blkno(first),
5185                                         num_clusters, new_bucket);
5186
5187         /* The extent must have room for an additional bucket */
5188         BUG_ON(new_bucket >=
5189                (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
5190
5191         /* end_blk points to the last existing bucket */
5192         end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
5193
5194         /*
5195          * end_blk is the start of the last existing bucket.
5196          * Thus, (end_blk - target_blk) covers the target bucket and
5197          * every bucket after it up to, but not including, the last
5198          * existing bucket.  Then we add the last existing bucket, the
5199          * new bucket, and the first bucket (3 * blk_per_bucket).
5200          */
5201         credits = (end_blk - target_blk) + (3 * blk_per_bucket);
5202         ret = ocfs2_extend_trans(handle, credits);
5203         if (ret) {
5204                 mlog_errno(ret);
5205                 goto out;
5206         }
5207
5208         ret = ocfs2_xattr_bucket_journal_access(handle, first,
5209                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5210         if (ret) {
5211                 mlog_errno(ret);
5212                 goto out;
5213         }
5214
5215         while (end_blk != target_blk) {
5216                 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
5217                                             end_blk + blk_per_bucket, 0);
5218                 if (ret)
5219                         goto out;
5220                 end_blk -= blk_per_bucket;
5221         }
5222
5223         /* Move half of the xattr in target_blkno to the next bucket. */
5224         ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
5225                                         target_blk + blk_per_bucket, NULL, 0);
5226
5227         le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
5228         ocfs2_xattr_bucket_journal_dirty(handle, first);
5229
5230 out:
5231         return ret;
5232 }
5233
5234 /*
5235  * Add new xattr bucket in an extent record and adjust the buckets
5236  * accordingly.  xb_bh is the ocfs2_xattr_block, and target is the
5237  * bucket we want to insert into.
5238  *
5239  * In the easy case, we will move all the buckets after target down by
5240  * one. Half of target's xattrs will be moved to the next bucket.
5241  *
5242  * If current cluster is full, we'll allocate a new one.  This may not
5243  * be contiguous.  The underlying calls will make sure that there is
5244  * space for the insert, shifting buckets around if necessary.
5245  * 'target' may be moved by those calls.
5246  */
5247 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
5248                                       struct buffer_head *xb_bh,
5249                                       struct ocfs2_xattr_bucket *target,
5250                                       struct ocfs2_xattr_set_ctxt *ctxt)
5251 {
5252         struct ocfs2_xattr_block *xb =
5253                         (struct ocfs2_xattr_block *)xb_bh->b_data;
5254         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
5255         struct ocfs2_extent_list *el = &xb_root->xt_list;
5256         u32 name_hash =
5257                 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
5258         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5259         int ret, num_buckets, extend = 1;
5260         u64 p_blkno;
5261         u32 e_cpos, num_clusters;
5262         /* The bucket at the front of the extent */
5263         struct ocfs2_xattr_bucket *first;
5264
5265         trace_ocfs2_add_new_xattr_bucket(
5266                                 (unsigned long long)bucket_blkno(target));
5267
5268         /* The first bucket of the original extent */
5269         first = ocfs2_xattr_bucket_new(inode);
5270         if (!first) {
5271                 ret = -ENOMEM;
5272                 mlog_errno(ret);
5273                 goto out;
5274         }
5275
5276         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
5277                                   &num_clusters, el);
5278         if (ret) {
5279                 mlog_errno(ret);
5280                 goto out;
5281         }
5282
5283         ret = ocfs2_read_xattr_bucket(first, p_blkno);
5284         if (ret) {
5285                 mlog_errno(ret);
5286                 goto out;
5287         }
5288
5289         num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
5290         if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
5291                 /*
5292                  * This can move first+target if the target bucket moves
5293                  * to the new extent.
5294                  */
5295                 ret = ocfs2_add_new_xattr_cluster(inode,
5296                                                   xb_bh,
5297                                                   first,
5298                                                   target,
5299                                                   &num_clusters,
5300                                                   e_cpos,
5301                                                   &extend,
5302                                                   ctxt);
5303                 if (ret) {
5304                         mlog_errno(ret);
5305                         goto out;
5306                 }
5307         }
5308
5309         if (extend) {
5310                 ret = ocfs2_extend_xattr_bucket(inode,
5311                                                 ctxt->handle,
5312                                                 first,
5313                                                 bucket_blkno(target),
5314                                                 num_clusters);
5315                 if (ret)
5316                         mlog_errno(ret);
5317         }
5318
5319 out:
5320         ocfs2_xattr_bucket_free(first);
5321
5322         return ret;
5323 }
5324
5325 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
5326                                         struct ocfs2_xattr_bucket *bucket,
5327                                         int offs)
5328 {
5329         int block_off = offs >> inode->i_sb->s_blocksize_bits;
5330
5331         offs = offs % inode->i_sb->s_blocksize;
5332         return bucket_block(bucket, block_off) + offs;
5333 }
5334
5335 /*
5336  * Truncate the specified xe_off entry in xattr bucket.
5337  * bucket is indicated by header_bh and len is the new length.
5338  * Both the ocfs2_xattr_value_root and the entry will be updated here.
5339  *
5340  * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
5341  */
5342 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
5343                                              struct ocfs2_xattr_bucket *bucket,
5344                                              int xe_off,
5345                                              int len,
5346                                              struct ocfs2_xattr_set_ctxt *ctxt)
5347 {
5348         int ret, offset;
5349         u64 value_blk;
5350         struct ocfs2_xattr_entry *xe;
5351         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5352         size_t blocksize = inode->i_sb->s_blocksize;
5353         struct ocfs2_xattr_value_buf vb = {
5354                 .vb_access = ocfs2_journal_access,
5355         };
5356
5357         xe = &xh->xh_entries[xe_off];
5358
5359         BUG_ON(!xe || ocfs2_xattr_is_local(xe));
5360
5361         offset = le16_to_cpu(xe->xe_name_offset) +
5362                  OCFS2_XATTR_SIZE(xe->xe_name_len);
5363
5364         value_blk = offset / blocksize;
5365
5366         /* We don't allow ocfs2_xattr_value to be stored in different block. */
5367         BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
5368
5369         vb.vb_bh = bucket->bu_bhs[value_blk];
5370         BUG_ON(!vb.vb_bh);
5371
5372         vb.vb_xv = (struct ocfs2_xattr_value_root *)
5373                 (vb.vb_bh->b_data + offset % blocksize);
5374
5375         /*
5376          * From here on out we have to dirty the bucket.  The generic
5377          * value calls only modify one of the bucket's bhs, but we need
5378          * to send the bucket at once.  So if they error, they *could* have
5379          * modified something.  We have to assume they did, and dirty
5380          * the whole bucket.  This leaves us in a consistent state.
5381          */
5382         trace_ocfs2_xattr_bucket_value_truncate(
5383                         (unsigned long long)bucket_blkno(bucket), xe_off, len);
5384         ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
5385         if (ret) {
5386                 mlog_errno(ret);
5387                 goto out;
5388         }
5389
5390         ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
5391                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5392         if (ret) {
5393                 mlog_errno(ret);
5394                 goto out;
5395         }
5396
5397         xe->xe_value_size = cpu_to_le64(len);
5398
5399         ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
5400
5401 out:
5402         return ret;
5403 }
5404
5405 static int ocfs2_rm_xattr_cluster(struct inode *inode,
5406                                   struct buffer_head *root_bh,
5407                                   u64 blkno,
5408                                   u32 cpos,
5409                                   u32 len,
5410                                   void *para)
5411 {
5412         int ret;
5413         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5414         struct inode *tl_inode = osb->osb_tl_inode;
5415         handle_t *handle;
5416         struct ocfs2_xattr_block *xb =
5417                         (struct ocfs2_xattr_block *)root_bh->b_data;
5418         struct ocfs2_alloc_context *meta_ac = NULL;
5419         struct ocfs2_cached_dealloc_ctxt dealloc;
5420         struct ocfs2_extent_tree et;
5421
5422         ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
5423                                           ocfs2_delete_xattr_in_bucket, para);
5424         if (ret) {
5425                 mlog_errno(ret);
5426                 return ret;
5427         }
5428
5429         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5430
5431         ocfs2_init_dealloc_ctxt(&dealloc);
5432
5433         trace_ocfs2_rm_xattr_cluster(
5434                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
5435                         (unsigned long long)blkno, cpos, len);
5436
5437         ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
5438                                                len);
5439
5440         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
5441         if (ret) {
5442                 mlog_errno(ret);
5443                 return ret;
5444         }
5445
5446         mutex_lock(&tl_inode->i_mutex);
5447
5448         if (ocfs2_truncate_log_needs_flush(osb)) {
5449                 ret = __ocfs2_flush_truncate_log(osb);
5450                 if (ret < 0) {
5451                         mlog_errno(ret);
5452                         goto out;
5453                 }
5454         }
5455
5456         handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
5457         if (IS_ERR(handle)) {
5458                 ret = -ENOMEM;
5459                 mlog_errno(ret);
5460                 goto out;
5461         }
5462
5463         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5464                                       OCFS2_JOURNAL_ACCESS_WRITE);
5465         if (ret) {
5466                 mlog_errno(ret);
5467                 goto out_commit;
5468         }
5469
5470         ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5471                                   &dealloc);
5472         if (ret) {
5473                 mlog_errno(ret);
5474                 goto out_commit;
5475         }
5476
5477         le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5478         ocfs2_journal_dirty(handle, root_bh);
5479
5480         ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5481         if (ret)
5482                 mlog_errno(ret);
5483
5484 out_commit:
5485         ocfs2_commit_trans(osb, handle);
5486 out:
5487         ocfs2_schedule_truncate_log_flush(osb, 1);
5488
5489         mutex_unlock(&tl_inode->i_mutex);
5490
5491         if (meta_ac)
5492                 ocfs2_free_alloc_context(meta_ac);
5493
5494         ocfs2_run_deallocs(osb, &dealloc);
5495
5496         return ret;
5497 }
5498
5499 /*
5500  * check whether the xattr bucket is filled up with the same hash value.
5501  * If we want to insert the xattr with the same hash, return -ENOSPC.
5502  * If we want to insert a xattr with different hash value, go ahead
5503  * and ocfs2_divide_xattr_bucket will handle this.
5504  */
5505 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5506                                               struct ocfs2_xattr_bucket *bucket,
5507                                               const char *name)
5508 {
5509         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5510         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5511
5512         if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5513                 return 0;
5514
5515         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5516             xh->xh_entries[0].xe_name_hash) {
5517                 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5518                      "hash = %u\n",
5519                      (unsigned long long)bucket_blkno(bucket),
5520                      le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5521                 return -ENOSPC;
5522         }
5523
5524         return 0;
5525 }
5526
5527 /*
5528  * Try to set the entry in the current bucket.  If we fail, the caller
5529  * will handle getting us another bucket.
5530  */
5531 static int ocfs2_xattr_set_entry_bucket(struct inode *inode,
5532                                         struct ocfs2_xattr_info *xi,
5533                                         struct ocfs2_xattr_search *xs,
5534                                         struct ocfs2_xattr_set_ctxt *ctxt)
5535 {
5536         int ret;
5537         struct ocfs2_xa_loc loc;
5538
5539         trace_ocfs2_xattr_set_entry_bucket(xi->xi_name);
5540
5541         ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
5542                                        xs->not_found ? NULL : xs->here);
5543         ret = ocfs2_xa_set(&loc, xi, ctxt);
5544         if (!ret) {
5545                 xs->here = loc.xl_entry;
5546                 goto out;
5547         }
5548         if (ret != -ENOSPC) {
5549                 mlog_errno(ret);
5550                 goto out;
5551         }
5552
5553         /* Ok, we need space.  Let's try defragmenting the bucket. */
5554         ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5555                                         xs->bucket);
5556         if (ret) {
5557                 mlog_errno(ret);
5558                 goto out;
5559         }
5560
5561         ret = ocfs2_xa_set(&loc, xi, ctxt);
5562         if (!ret) {
5563                 xs->here = loc.xl_entry;
5564                 goto out;
5565         }
5566         if (ret != -ENOSPC)
5567                 mlog_errno(ret);
5568
5569
5570 out:
5571         return ret;
5572 }
5573
5574 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5575                                              struct ocfs2_xattr_info *xi,
5576                                              struct ocfs2_xattr_search *xs,
5577                                              struct ocfs2_xattr_set_ctxt *ctxt)
5578 {
5579         int ret;
5580
5581         trace_ocfs2_xattr_set_entry_index_block(xi->xi_name);
5582
5583         ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5584         if (!ret)
5585                 goto out;
5586         if (ret != -ENOSPC) {
5587                 mlog_errno(ret);
5588                 goto out;
5589         }
5590
5591         /* Ack, need more space.  Let's try to get another bucket! */
5592
5593         /*
5594          * We do not allow for overlapping ranges between buckets. And
5595          * the maximum number of collisions we will allow for then is
5596          * one bucket's worth, so check it here whether we need to
5597          * add a new bucket for the insert.
5598          */
5599         ret = ocfs2_check_xattr_bucket_collision(inode,
5600                                                  xs->bucket,
5601                                                  xi->xi_name);
5602         if (ret) {
5603                 mlog_errno(ret);
5604                 goto out;
5605         }
5606
5607         ret = ocfs2_add_new_xattr_bucket(inode,
5608                                          xs->xattr_bh,
5609                                          xs->bucket,
5610                                          ctxt);
5611         if (ret) {
5612                 mlog_errno(ret);
5613                 goto out;
5614         }
5615
5616         /*
5617          * ocfs2_add_new_xattr_bucket() will have updated
5618          * xs->bucket if it moved, but it will not have updated
5619          * any of the other search fields.  Thus, we drop it and
5620          * re-search.  Everything should be cached, so it'll be
5621          * quick.
5622          */
5623         ocfs2_xattr_bucket_relse(xs->bucket);
5624         ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5625                                            xi->xi_name_index,
5626                                            xi->xi_name, xs);
5627         if (ret && ret != -ENODATA)
5628                 goto out;
5629         xs->not_found = ret;
5630
5631         /* Ok, we have a new bucket, let's try again */
5632         ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5633         if (ret && (ret != -ENOSPC))
5634                 mlog_errno(ret);
5635
5636 out:
5637         return ret;
5638 }
5639
5640 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5641                                         struct ocfs2_xattr_bucket *bucket,
5642                                         void *para)
5643 {
5644         int ret = 0, ref_credits;
5645         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5646         u16 i;
5647         struct ocfs2_xattr_entry *xe;
5648         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5649         struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5650         int credits = ocfs2_remove_extent_credits(osb->sb) +
5651                 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5652         struct ocfs2_xattr_value_root *xv;
5653         struct ocfs2_rm_xattr_bucket_para *args =
5654                         (struct ocfs2_rm_xattr_bucket_para *)para;
5655
5656         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5657
5658         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5659                 xe = &xh->xh_entries[i];
5660                 if (ocfs2_xattr_is_local(xe))
5661                         continue;
5662
5663                 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
5664                                                       i, &xv, NULL);
5665
5666                 ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
5667                                                          args->ref_ci,
5668                                                          args->ref_root_bh,
5669                                                          &ctxt.meta_ac,
5670                                                          &ref_credits);
5671
5672                 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
5673                 if (IS_ERR(ctxt.handle)) {
5674                         ret = PTR_ERR(ctxt.handle);
5675                         mlog_errno(ret);
5676                         break;
5677                 }
5678
5679                 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5680                                                         i, 0, &ctxt);
5681
5682                 ocfs2_commit_trans(osb, ctxt.handle);
5683                 if (ctxt.meta_ac) {
5684                         ocfs2_free_alloc_context(ctxt.meta_ac);
5685                         ctxt.meta_ac = NULL;
5686                 }
5687                 if (ret) {
5688                         mlog_errno(ret);
5689                         break;
5690                 }
5691         }
5692
5693         if (ctxt.meta_ac)
5694                 ocfs2_free_alloc_context(ctxt.meta_ac);
5695         ocfs2_schedule_truncate_log_flush(osb, 1);
5696         ocfs2_run_deallocs(osb, &ctxt.dealloc);
5697         return ret;
5698 }
5699
5700 /*
5701  * Whenever we modify a xattr value root in the bucket(e.g, CoW
5702  * or change the extent record flag), we need to recalculate
5703  * the metaecc for the whole bucket. So it is done here.
5704  *
5705  * Note:
5706  * We have to give the extra credits for the caller.
5707  */
5708 static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5709                                             handle_t *handle,
5710                                             void *para)
5711 {
5712         int ret;
5713         struct ocfs2_xattr_bucket *bucket =
5714                         (struct ocfs2_xattr_bucket *)para;
5715
5716         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5717                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5718         if (ret) {
5719                 mlog_errno(ret);
5720                 return ret;
5721         }
5722
5723         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5724
5725         return 0;
5726 }
5727
5728 /*
5729  * Special action we need if the xattr value is refcounted.
5730  *
5731  * 1. If the xattr is refcounted, lock the tree.
5732  * 2. CoW the xattr if we are setting the new value and the value
5733  *    will be stored outside.
5734  * 3. In other case, decrease_refcount will work for us, so just
5735  *    lock the refcount tree, calculate the meta and credits is OK.
5736  *
5737  * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5738  * currently CoW is a completed transaction, while this function
5739  * will also lock the allocators and let us deadlock. So we will
5740  * CoW the whole xattr value.
5741  */
5742 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5743                                         struct ocfs2_dinode *di,
5744                                         struct ocfs2_xattr_info *xi,
5745                                         struct ocfs2_xattr_search *xis,
5746                                         struct ocfs2_xattr_search *xbs,
5747                                         struct ocfs2_refcount_tree **ref_tree,
5748                                         int *meta_add,
5749                                         int *credits)
5750 {
5751         int ret = 0;
5752         struct ocfs2_xattr_block *xb;
5753         struct ocfs2_xattr_entry *xe;
5754         char *base;
5755         u32 p_cluster, num_clusters;
5756         unsigned int ext_flags;
5757         int name_offset, name_len;
5758         struct ocfs2_xattr_value_buf vb;
5759         struct ocfs2_xattr_bucket *bucket = NULL;
5760         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5761         struct ocfs2_post_refcount refcount;
5762         struct ocfs2_post_refcount *p = NULL;
5763         struct buffer_head *ref_root_bh = NULL;
5764
5765         if (!xis->not_found) {
5766                 xe = xis->here;
5767                 name_offset = le16_to_cpu(xe->xe_name_offset);
5768                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5769                 base = xis->base;
5770                 vb.vb_bh = xis->inode_bh;
5771                 vb.vb_access = ocfs2_journal_access_di;
5772         } else {
5773                 int i, block_off = 0;
5774                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5775                 xe = xbs->here;
5776                 name_offset = le16_to_cpu(xe->xe_name_offset);
5777                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5778                 i = xbs->here - xbs->header->xh_entries;
5779
5780                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5781                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5782                                                         bucket_xh(xbs->bucket),
5783                                                         i, &block_off,
5784                                                         &name_offset);
5785                         if (ret) {
5786                                 mlog_errno(ret);
5787                                 goto out;
5788                         }
5789                         base = bucket_block(xbs->bucket, block_off);
5790                         vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5791                         vb.vb_access = ocfs2_journal_access;
5792
5793                         if (ocfs2_meta_ecc(osb)) {
5794                                 /*create parameters for ocfs2_post_refcount. */
5795                                 bucket = xbs->bucket;
5796                                 refcount.credits = bucket->bu_blocks;
5797                                 refcount.para = bucket;
5798                                 refcount.func =
5799                                         ocfs2_xattr_bucket_post_refcount;
5800                                 p = &refcount;
5801                         }
5802                 } else {
5803                         base = xbs->base;
5804                         vb.vb_bh = xbs->xattr_bh;
5805                         vb.vb_access = ocfs2_journal_access_xb;
5806                 }
5807         }
5808
5809         if (ocfs2_xattr_is_local(xe))
5810                 goto out;
5811
5812         vb.vb_xv = (struct ocfs2_xattr_value_root *)
5813                                 (base + name_offset + name_len);
5814
5815         ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5816                                        &num_clusters, &vb.vb_xv->xr_list,
5817                                        &ext_flags);
5818         if (ret) {
5819                 mlog_errno(ret);
5820                 goto out;
5821         }
5822
5823         /*
5824          * We just need to check the 1st extent record, since we always
5825          * CoW the whole xattr. So there shouldn't be a xattr with
5826          * some REFCOUNT extent recs after the 1st one.
5827          */
5828         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5829                 goto out;
5830
5831         ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5832                                        1, ref_tree, &ref_root_bh);
5833         if (ret) {
5834                 mlog_errno(ret);
5835                 goto out;
5836         }
5837
5838         /*
5839          * If we are deleting the xattr or the new size will be stored inside,
5840          * cool, leave it there, the xattr truncate process will remove them
5841          * for us(it still needs the refcount tree lock and the meta, credits).
5842          * And the worse case is that every cluster truncate will split the
5843          * refcount tree, and make the original extent become 3. So we will need
5844          * 2 * cluster more extent recs at most.
5845          */
5846         if (!xi->xi_value || xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE) {
5847
5848                 ret = ocfs2_refcounted_xattr_delete_need(inode,
5849                                                          &(*ref_tree)->rf_ci,
5850                                                          ref_root_bh, vb.vb_xv,
5851                                                          meta_add, credits);
5852                 if (ret)
5853                         mlog_errno(ret);
5854                 goto out;
5855         }
5856
5857         ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5858                                        *ref_tree, ref_root_bh, 0,
5859                                        le32_to_cpu(vb.vb_xv->xr_clusters), p);
5860         if (ret)
5861                 mlog_errno(ret);
5862
5863 out:
5864         brelse(ref_root_bh);
5865         return ret;
5866 }
5867
5868 /*
5869  * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
5870  * The physical clusters will be added to refcount tree.
5871  */
5872 static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
5873                                 struct ocfs2_xattr_value_root *xv,
5874                                 struct ocfs2_extent_tree *value_et,
5875                                 struct ocfs2_caching_info *ref_ci,
5876                                 struct buffer_head *ref_root_bh,
5877                                 struct ocfs2_cached_dealloc_ctxt *dealloc,
5878                                 struct ocfs2_post_refcount *refcount)
5879 {
5880         int ret = 0;
5881         u32 clusters = le32_to_cpu(xv->xr_clusters);
5882         u32 cpos, p_cluster, num_clusters;
5883         struct ocfs2_extent_list *el = &xv->xr_list;
5884         unsigned int ext_flags;
5885
5886         cpos = 0;
5887         while (cpos < clusters) {
5888                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
5889                                                &num_clusters, el, &ext_flags);
5890
5891                 cpos += num_clusters;
5892                 if ((ext_flags & OCFS2_EXT_REFCOUNTED))
5893                         continue;
5894
5895                 BUG_ON(!p_cluster);
5896
5897                 ret = ocfs2_add_refcount_flag(inode, value_et,
5898                                               ref_ci, ref_root_bh,
5899                                               cpos - num_clusters,
5900                                               p_cluster, num_clusters,
5901                                               dealloc, refcount);
5902                 if (ret) {
5903                         mlog_errno(ret);
5904                         break;
5905                 }
5906         }
5907
5908         return ret;
5909 }
5910
5911 /*
5912  * Given a normal ocfs2_xattr_header, refcount all the entries which
5913  * have value stored outside.
5914  * Used for xattrs stored in inode and ocfs2_xattr_block.
5915  */
5916 static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
5917                                 struct ocfs2_xattr_value_buf *vb,
5918                                 struct ocfs2_xattr_header *header,
5919                                 struct ocfs2_caching_info *ref_ci,
5920                                 struct buffer_head *ref_root_bh,
5921                                 struct ocfs2_cached_dealloc_ctxt *dealloc)
5922 {
5923
5924         struct ocfs2_xattr_entry *xe;
5925         struct ocfs2_xattr_value_root *xv;
5926         struct ocfs2_extent_tree et;
5927         int i, ret = 0;
5928
5929         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
5930                 xe = &header->xh_entries[i];
5931
5932                 if (ocfs2_xattr_is_local(xe))
5933                         continue;
5934
5935                 xv = (struct ocfs2_xattr_value_root *)((void *)header +
5936                         le16_to_cpu(xe->xe_name_offset) +
5937                         OCFS2_XATTR_SIZE(xe->xe_name_len));
5938
5939                 vb->vb_xv = xv;
5940                 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
5941
5942                 ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
5943                                                         ref_ci, ref_root_bh,
5944                                                         dealloc, NULL);
5945                 if (ret) {
5946                         mlog_errno(ret);
5947                         break;
5948                 }
5949         }
5950
5951         return ret;
5952 }
5953
5954 static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
5955                                 struct buffer_head *fe_bh,
5956                                 struct ocfs2_caching_info *ref_ci,
5957                                 struct buffer_head *ref_root_bh,
5958                                 struct ocfs2_cached_dealloc_ctxt *dealloc)
5959 {
5960         struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
5961         struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
5962                                 (fe_bh->b_data + inode->i_sb->s_blocksize -
5963                                 le16_to_cpu(di->i_xattr_inline_size));
5964         struct ocfs2_xattr_value_buf vb = {
5965                 .vb_bh = fe_bh,
5966                 .vb_access = ocfs2_journal_access_di,
5967         };
5968
5969         return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
5970                                                   ref_ci, ref_root_bh, dealloc);
5971 }
5972
5973 struct ocfs2_xattr_tree_value_refcount_para {
5974         struct ocfs2_caching_info *ref_ci;
5975         struct buffer_head *ref_root_bh;
5976         struct ocfs2_cached_dealloc_ctxt *dealloc;
5977 };
5978
5979 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
5980                                            struct ocfs2_xattr_bucket *bucket,
5981                                            int offset,
5982                                            struct ocfs2_xattr_value_root **xv,
5983                                            struct buffer_head **bh)
5984 {
5985         int ret, block_off, name_offset;
5986         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5987         struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
5988         void *base;
5989
5990         ret = ocfs2_xattr_bucket_get_name_value(sb,
5991                                                 bucket_xh(bucket),
5992                                                 offset,
5993                                                 &block_off,
5994                                                 &name_offset);
5995         if (ret) {
5996                 mlog_errno(ret);
5997                 goto out;
5998         }
5999
6000         base = bucket_block(bucket, block_off);
6001
6002         *xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
6003                          OCFS2_XATTR_SIZE(xe->xe_name_len));
6004
6005         if (bh)
6006                 *bh = bucket->bu_bhs[block_off];
6007 out:
6008         return ret;
6009 }
6010
6011 /*
6012  * For a given xattr bucket, refcount all the entries which
6013  * have value stored outside.
6014  */
6015 static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
6016                                              struct ocfs2_xattr_bucket *bucket,
6017                                              void *para)
6018 {
6019         int i, ret = 0;
6020         struct ocfs2_extent_tree et;
6021         struct ocfs2_xattr_tree_value_refcount_para *ref =
6022                         (struct ocfs2_xattr_tree_value_refcount_para *)para;
6023         struct ocfs2_xattr_header *xh =
6024                         (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6025         struct ocfs2_xattr_entry *xe;
6026         struct ocfs2_xattr_value_buf vb = {
6027                 .vb_access = ocfs2_journal_access,
6028         };
6029         struct ocfs2_post_refcount refcount = {
6030                 .credits = bucket->bu_blocks,
6031                 .para = bucket,
6032                 .func = ocfs2_xattr_bucket_post_refcount,
6033         };
6034         struct ocfs2_post_refcount *p = NULL;
6035
6036         /* We only need post_refcount if we support metaecc. */
6037         if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
6038                 p = &refcount;
6039
6040         trace_ocfs2_xattr_bucket_value_refcount(
6041                                 (unsigned long long)bucket_blkno(bucket),
6042                                 le16_to_cpu(xh->xh_count));
6043         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6044                 xe = &xh->xh_entries[i];
6045
6046                 if (ocfs2_xattr_is_local(xe))
6047                         continue;
6048
6049                 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
6050                                                       &vb.vb_xv, &vb.vb_bh);
6051                 if (ret) {
6052                         mlog_errno(ret);
6053                         break;
6054                 }
6055
6056                 ocfs2_init_xattr_value_extent_tree(&et,
6057                                                    INODE_CACHE(inode), &vb);
6058
6059                 ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
6060                                                         &et, ref->ref_ci,
6061                                                         ref->ref_root_bh,
6062                                                         ref->dealloc, p);
6063                 if (ret) {
6064                         mlog_errno(ret);
6065                         break;
6066                 }
6067         }
6068
6069         return ret;
6070
6071 }
6072
6073 static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
6074                                      struct buffer_head *root_bh,
6075                                      u64 blkno, u32 cpos, u32 len, void *para)
6076 {
6077         return ocfs2_iterate_xattr_buckets(inode, blkno, len,
6078                                            ocfs2_xattr_bucket_value_refcount,
6079                                            para);
6080 }
6081
6082 static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
6083                                 struct buffer_head *blk_bh,
6084                                 struct ocfs2_caching_info *ref_ci,
6085                                 struct buffer_head *ref_root_bh,
6086                                 struct ocfs2_cached_dealloc_ctxt *dealloc)
6087 {
6088         int ret = 0;
6089         struct ocfs2_xattr_block *xb =
6090                                 (struct ocfs2_xattr_block *)blk_bh->b_data;
6091
6092         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
6093                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
6094                 struct ocfs2_xattr_value_buf vb = {
6095                         .vb_bh = blk_bh,
6096                         .vb_access = ocfs2_journal_access_xb,
6097                 };
6098
6099                 ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
6100                                                          ref_ci, ref_root_bh,
6101                                                          dealloc);
6102         } else {
6103                 struct ocfs2_xattr_tree_value_refcount_para para = {
6104                         .ref_ci = ref_ci,
6105                         .ref_root_bh = ref_root_bh,
6106                         .dealloc = dealloc,
6107                 };
6108
6109                 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
6110                                                 ocfs2_refcount_xattr_tree_rec,
6111                                                 &para);
6112         }
6113
6114         return ret;
6115 }
6116
6117 int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
6118                                      struct buffer_head *fe_bh,
6119                                      struct ocfs2_caching_info *ref_ci,
6120                                      struct buffer_head *ref_root_bh,
6121                                      struct ocfs2_cached_dealloc_ctxt *dealloc)
6122 {
6123         int ret = 0;
6124         struct ocfs2_inode_info *oi = OCFS2_I(inode);
6125         struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
6126         struct buffer_head *blk_bh = NULL;
6127
6128         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
6129                 ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
6130                                                          ref_ci, ref_root_bh,
6131                                                          dealloc);
6132                 if (ret) {
6133                         mlog_errno(ret);
6134                         goto out;
6135                 }
6136         }
6137
6138         if (!di->i_xattr_loc)
6139                 goto out;
6140
6141         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
6142                                      &blk_bh);
6143         if (ret < 0) {
6144                 mlog_errno(ret);
6145                 goto out;
6146         }
6147
6148         ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
6149                                                 ref_root_bh, dealloc);
6150         if (ret)
6151                 mlog_errno(ret);
6152
6153         brelse(blk_bh);
6154 out:
6155
6156         return ret;
6157 }
6158
6159 typedef int (should_xattr_reflinked)(struct ocfs2_xattr_entry *xe);
6160 /*
6161  * Store the information we need in xattr reflink.
6162  * old_bh and new_bh are inode bh for the old and new inode.
6163  */
6164 struct ocfs2_xattr_reflink {
6165         struct inode *old_inode;
6166         struct inode *new_inode;
6167         struct buffer_head *old_bh;
6168         struct buffer_head *new_bh;
6169         struct ocfs2_caching_info *ref_ci;
6170         struct buffer_head *ref_root_bh;
6171         struct ocfs2_cached_dealloc_ctxt *dealloc;
6172         should_xattr_reflinked *xattr_reflinked;
6173 };
6174
6175 /*
6176  * Given a xattr header and xe offset,
6177  * return the proper xv and the corresponding bh.
6178  * xattr in inode, block and xattr tree have different implementaions.
6179  */
6180 typedef int (get_xattr_value_root)(struct super_block *sb,
6181                                    struct buffer_head *bh,
6182                                    struct ocfs2_xattr_header *xh,
6183                                    int offset,
6184                                    struct ocfs2_xattr_value_root **xv,
6185                                    struct buffer_head **ret_bh,
6186                                    void *para);
6187
6188 /*
6189  * Calculate all the xattr value root metadata stored in this xattr header and
6190  * credits we need if we create them from the scratch.
6191  * We use get_xattr_value_root so that all types of xattr container can use it.
6192  */
6193 static int ocfs2_value_metas_in_xattr_header(struct super_block *sb,
6194                                              struct buffer_head *bh,
6195                                              struct ocfs2_xattr_header *xh,
6196                                              int *metas, int *credits,
6197                                              int *num_recs,
6198                                              get_xattr_value_root *func,
6199                                              void *para)
6200 {
6201         int i, ret = 0;
6202         struct ocfs2_xattr_value_root *xv;
6203         struct ocfs2_xattr_entry *xe;
6204
6205         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6206                 xe = &xh->xh_entries[i];
6207                 if (ocfs2_xattr_is_local(xe))
6208                         continue;
6209
6210                 ret = func(sb, bh, xh, i, &xv, NULL, para);
6211                 if (ret) {
6212                         mlog_errno(ret);
6213                         break;
6214                 }
6215
6216                 *metas += le16_to_cpu(xv->xr_list.l_tree_depth) *
6217                           le16_to_cpu(xv->xr_list.l_next_free_rec);
6218
6219                 *credits += ocfs2_calc_extend_credits(sb,
6220                                                 &def_xv.xv.xr_list,
6221                                                 le32_to_cpu(xv->xr_clusters));
6222
6223                 /*
6224                  * If the value is a tree with depth > 1, We don't go deep
6225                  * to the extent block, so just calculate a maximum record num.
6226                  */
6227                 if (!xv->xr_list.l_tree_depth)
6228                         *num_recs += le16_to_cpu(xv->xr_list.l_next_free_rec);
6229                 else
6230                         *num_recs += ocfs2_clusters_for_bytes(sb,
6231                                                               XATTR_SIZE_MAX);
6232         }
6233
6234         return ret;
6235 }
6236
6237 /* Used by xattr inode and block to return the right xv and buffer_head. */
6238 static int ocfs2_get_xattr_value_root(struct super_block *sb,
6239                                       struct buffer_head *bh,
6240                                       struct ocfs2_xattr_header *xh,
6241                                       int offset,
6242                                       struct ocfs2_xattr_value_root **xv,
6243                                       struct buffer_head **ret_bh,
6244                                       void *para)
6245 {
6246         struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6247
6248         *xv = (struct ocfs2_xattr_value_root *)((void *)xh +
6249                 le16_to_cpu(xe->xe_name_offset) +
6250                 OCFS2_XATTR_SIZE(xe->xe_name_len));
6251
6252         if (ret_bh)
6253                 *ret_bh = bh;
6254
6255         return 0;
6256 }
6257
6258 /*
6259  * Lock the meta_ac and caculate how much credits we need for reflink xattrs.
6260  * It is only used for inline xattr and xattr block.
6261  */
6262 static int ocfs2_reflink_lock_xattr_allocators(struct ocfs2_super *osb,
6263                                         struct ocfs2_xattr_header *xh,
6264                                         struct buffer_head *ref_root_bh,
6265                                         int *credits,
6266                                         struct ocfs2_alloc_context **meta_ac)
6267 {
6268         int ret, meta_add = 0, num_recs = 0;
6269         struct ocfs2_refcount_block *rb =
6270                         (struct ocfs2_refcount_block *)ref_root_bh->b_data;
6271
6272         *credits = 0;
6273
6274         ret = ocfs2_value_metas_in_xattr_header(osb->sb, NULL, xh,
6275                                                 &meta_add, credits, &num_recs,
6276                                                 ocfs2_get_xattr_value_root,
6277                                                 NULL);
6278         if (ret) {
6279                 mlog_errno(ret);
6280                 goto out;
6281         }
6282
6283         /*
6284          * We need to add/modify num_recs in refcount tree, so just calculate
6285          * an approximate number we need for refcount tree change.
6286          * Sometimes we need to split the tree, and after split,  half recs
6287          * will be moved to the new block, and a new block can only provide
6288          * half number of recs. So we multiple new blocks by 2.
6289          */
6290         num_recs = num_recs / ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6291         meta_add += num_recs;
6292         *credits += num_recs + num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6293         if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6294                 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6295                             le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6296         else
6297                 *credits += 1;
6298
6299         ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add, meta_ac);
6300         if (ret)
6301                 mlog_errno(ret);
6302
6303 out:
6304         return ret;
6305 }
6306
6307 /*
6308  * Given a xattr header, reflink all the xattrs in this container.
6309  * It can be used for inode, block and bucket.
6310  *
6311  * NOTE:
6312  * Before we call this function, the caller has memcpy the xattr in
6313  * old_xh to the new_xh.
6314  *
6315  * If args.xattr_reflinked is set, call it to decide whether the xe should
6316  * be reflinked or not. If not, remove it from the new xattr header.
6317  */
6318 static int ocfs2_reflink_xattr_header(handle_t *handle,
6319                                       struct ocfs2_xattr_reflink *args,
6320                                       struct buffer_head *old_bh,
6321                                       struct ocfs2_xattr_header *xh,
6322                                       struct buffer_head *new_bh,
6323                                       struct ocfs2_xattr_header *new_xh,
6324                                       struct ocfs2_xattr_value_buf *vb,
6325                                       struct ocfs2_alloc_context *meta_ac,
6326                                       get_xattr_value_root *func,
6327                                       void *para)
6328 {
6329         int ret = 0, i, j;
6330         struct super_block *sb = args->old_inode->i_sb;
6331         struct buffer_head *value_bh;
6332         struct ocfs2_xattr_entry *xe, *last;
6333         struct ocfs2_xattr_value_root *xv, *new_xv;
6334         struct ocfs2_extent_tree data_et;
6335         u32 clusters, cpos, p_cluster, num_clusters;
6336         unsigned int ext_flags = 0;
6337
6338         trace_ocfs2_reflink_xattr_header((unsigned long long)old_bh->b_blocknr,
6339                                          le16_to_cpu(xh->xh_count));
6340
6341         last = &new_xh->xh_entries[le16_to_cpu(new_xh->xh_count)];
6342         for (i = 0, j = 0; i < le16_to_cpu(xh->xh_count); i++, j++) {
6343                 xe = &xh->xh_entries[i];
6344
6345                 if (args->xattr_reflinked && !args->xattr_reflinked(xe)) {
6346                         xe = &new_xh->xh_entries[j];
6347
6348                         le16_add_cpu(&new_xh->xh_count, -1);
6349                         if (new_xh->xh_count) {
6350                                 memmove(xe, xe + 1,
6351                                         (void *)last - (void *)xe);
6352                                 memset(last, 0,
6353                                        sizeof(struct ocfs2_xattr_entry));
6354                         }
6355
6356                         /*
6357                          * We don't want j to increase in the next round since
6358                          * it is already moved ahead.
6359                          */
6360                         j--;
6361                         continue;
6362                 }
6363
6364                 if (ocfs2_xattr_is_local(xe))
6365                         continue;
6366
6367                 ret = func(sb, old_bh, xh, i, &xv, NULL, para);
6368                 if (ret) {
6369                         mlog_errno(ret);
6370                         break;
6371                 }
6372
6373                 ret = func(sb, new_bh, new_xh, j, &new_xv, &value_bh, para);
6374                 if (ret) {
6375                         mlog_errno(ret);
6376                         break;
6377                 }
6378
6379                 /*
6380                  * For the xattr which has l_tree_depth = 0, all the extent
6381                  * recs have already be copied to the new xh with the
6382                  * propriate OCFS2_EXT_REFCOUNTED flag we just need to
6383                  * increase the refount count int the refcount tree.
6384                  *
6385                  * For the xattr which has l_tree_depth > 0, we need
6386                  * to initialize it to the empty default value root,
6387                  * and then insert the extents one by one.
6388                  */
6389                 if (xv->xr_list.l_tree_depth) {
6390                         memcpy(new_xv, &def_xv, sizeof(def_xv));
6391                         vb->vb_xv = new_xv;
6392                         vb->vb_bh = value_bh;
6393                         ocfs2_init_xattr_value_extent_tree(&data_et,
6394                                         INODE_CACHE(args->new_inode), vb);
6395                 }
6396
6397                 clusters = le32_to_cpu(xv->xr_clusters);
6398                 cpos = 0;
6399                 while (cpos < clusters) {
6400                         ret = ocfs2_xattr_get_clusters(args->old_inode,
6401                                                        cpos,
6402                                                        &p_cluster,
6403                                                        &num_clusters,
6404                                                        &xv->xr_list,
6405                                                        &ext_flags);
6406                         if (ret) {
6407                                 mlog_errno(ret);
6408                                 goto out;
6409                         }
6410
6411                         BUG_ON(!p_cluster);
6412
6413                         if (xv->xr_list.l_tree_depth) {
6414                                 ret = ocfs2_insert_extent(handle,
6415                                                 &data_et, cpos,
6416                                                 ocfs2_clusters_to_blocks(
6417                                                         args->old_inode->i_sb,
6418                                                         p_cluster),
6419                                                 num_clusters, ext_flags,
6420                                                 meta_ac);
6421                                 if (ret) {
6422                                         mlog_errno(ret);
6423                                         goto out;
6424                                 }
6425                         }
6426
6427                         ret = ocfs2_increase_refcount(handle, args->ref_ci,
6428                                                       args->ref_root_bh,
6429                                                       p_cluster, num_clusters,
6430                                                       meta_ac, args->dealloc);
6431                         if (ret) {
6432                                 mlog_errno(ret);
6433                                 goto out;
6434                         }
6435
6436                         cpos += num_clusters;
6437                 }
6438         }
6439
6440 out:
6441         return ret;
6442 }
6443
6444 static int ocfs2_reflink_xattr_inline(struct ocfs2_xattr_reflink *args)
6445 {
6446         int ret = 0, credits = 0;
6447         handle_t *handle;
6448         struct ocfs2_super *osb = OCFS2_SB(args->old_inode->i_sb);
6449         struct ocfs2_dinode *di = (struct ocfs2_dinode *)args->old_bh->b_data;
6450         int inline_size = le16_to_cpu(di->i_xattr_inline_size);
6451         int header_off = osb->sb->s_blocksize - inline_size;
6452         struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)
6453                                         (args->old_bh->b_data + header_off);
6454         struct ocfs2_xattr_header *new_xh = (struct ocfs2_xattr_header *)
6455                                         (args->new_bh->b_data + header_off);
6456         struct ocfs2_alloc_context *meta_ac = NULL;
6457         struct ocfs2_inode_info *new_oi;
6458         struct ocfs2_dinode *new_di;
6459         struct ocfs2_xattr_value_buf vb = {
6460                 .vb_bh = args->new_bh,
6461                 .vb_access = ocfs2_journal_access_di,
6462         };
6463
6464         ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6465                                                   &credits, &meta_ac);
6466         if (ret) {
6467                 mlog_errno(ret);
6468                 goto out;
6469         }
6470
6471         handle = ocfs2_start_trans(osb, credits);
6472         if (IS_ERR(handle)) {
6473                 ret = PTR_ERR(handle);
6474                 mlog_errno(ret);
6475                 goto out;
6476         }
6477
6478         ret = ocfs2_journal_access_di(handle, INODE_CACHE(args->new_inode),
6479                                       args->new_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6480         if (ret) {
6481                 mlog_errno(ret);
6482                 goto out_commit;
6483         }
6484
6485         memcpy(args->new_bh->b_data + header_off,
6486                args->old_bh->b_data + header_off, inline_size);
6487
6488         new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6489         new_di->i_xattr_inline_size = cpu_to_le16(inline_size);
6490
6491         ret = ocfs2_reflink_xattr_header(handle, args, args->old_bh, xh,
6492                                          args->new_bh, new_xh, &vb, meta_ac,
6493                                          ocfs2_get_xattr_value_root, NULL);
6494         if (ret) {
6495                 mlog_errno(ret);
6496                 goto out_commit;
6497         }
6498
6499         new_oi = OCFS2_I(args->new_inode);
6500         spin_lock(&new_oi->ip_lock);
6501         new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL | OCFS2_INLINE_XATTR_FL;
6502         new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6503         spin_unlock(&new_oi->ip_lock);
6504
6505         ocfs2_journal_dirty(handle, args->new_bh);
6506
6507 out_commit:
6508         ocfs2_commit_trans(osb, handle);
6509
6510 out:
6511         if (meta_ac)
6512                 ocfs2_free_alloc_context(meta_ac);
6513         return ret;
6514 }
6515
6516 static int ocfs2_create_empty_xattr_block(struct inode *inode,
6517                                           struct buffer_head *fe_bh,
6518                                           struct buffer_head **ret_bh,
6519                                           int indexed)
6520 {
6521         int ret;
6522         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6523         struct ocfs2_xattr_set_ctxt ctxt;
6524
6525         memset(&ctxt, 0, sizeof(ctxt));
6526         ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &ctxt.meta_ac);
6527         if (ret < 0) {
6528                 mlog_errno(ret);
6529                 return ret;
6530         }
6531
6532         ctxt.handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS);
6533         if (IS_ERR(ctxt.handle)) {
6534                 ret = PTR_ERR(ctxt.handle);
6535                 mlog_errno(ret);
6536                 goto out;
6537         }
6538
6539         trace_ocfs2_create_empty_xattr_block(
6540                                 (unsigned long long)fe_bh->b_blocknr, indexed);
6541         ret = ocfs2_create_xattr_block(inode, fe_bh, &ctxt, indexed,
6542                                        ret_bh);
6543         if (ret)
6544                 mlog_errno(ret);
6545
6546         ocfs2_commit_trans(osb, ctxt.handle);
6547 out:
6548         ocfs2_free_alloc_context(ctxt.meta_ac);
6549         return ret;
6550 }
6551
6552 static int ocfs2_reflink_xattr_block(struct ocfs2_xattr_reflink *args,
6553                                      struct buffer_head *blk_bh,
6554                                      struct buffer_head *new_blk_bh)
6555 {
6556         int ret = 0, credits = 0;
6557         handle_t *handle;
6558         struct ocfs2_inode_info *new_oi = OCFS2_I(args->new_inode);
6559         struct ocfs2_dinode *new_di;
6560         struct ocfs2_super *osb = OCFS2_SB(args->new_inode->i_sb);
6561         int header_off = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
6562         struct ocfs2_xattr_block *xb =
6563                         (struct ocfs2_xattr_block *)blk_bh->b_data;
6564         struct ocfs2_xattr_header *xh = &xb->xb_attrs.xb_header;
6565         struct ocfs2_xattr_block *new_xb =
6566                         (struct ocfs2_xattr_block *)new_blk_bh->b_data;
6567         struct ocfs2_xattr_header *new_xh = &new_xb->xb_attrs.xb_header;
6568         struct ocfs2_alloc_context *meta_ac;
6569         struct ocfs2_xattr_value_buf vb = {
6570                 .vb_bh = new_blk_bh,
6571                 .vb_access = ocfs2_journal_access_xb,
6572         };
6573
6574         ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6575                                                   &credits, &meta_ac);
6576         if (ret) {
6577                 mlog_errno(ret);
6578                 return ret;
6579         }
6580
6581         /* One more credits in case we need to add xattr flags in new inode. */
6582         handle = ocfs2_start_trans(osb, credits + 1);
6583         if (IS_ERR(handle)) {
6584                 ret = PTR_ERR(handle);
6585                 mlog_errno(ret);
6586                 goto out;
6587         }
6588
6589         if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6590                 ret = ocfs2_journal_access_di(handle,
6591                                               INODE_CACHE(args->new_inode),
6592                                               args->new_bh,
6593                                               OCFS2_JOURNAL_ACCESS_WRITE);
6594                 if (ret) {
6595                         mlog_errno(ret);
6596                         goto out_commit;
6597                 }
6598         }
6599
6600         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(args->new_inode),
6601                                       new_blk_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6602         if (ret) {
6603                 mlog_errno(ret);
6604                 goto out_commit;
6605         }
6606
6607         memcpy(new_blk_bh->b_data + header_off, blk_bh->b_data + header_off,
6608                osb->sb->s_blocksize - header_off);
6609
6610         ret = ocfs2_reflink_xattr_header(handle, args, blk_bh, xh,
6611                                          new_blk_bh, new_xh, &vb, meta_ac,
6612                                          ocfs2_get_xattr_value_root, NULL);
6613         if (ret) {
6614                 mlog_errno(ret);
6615                 goto out_commit;
6616         }
6617
6618         ocfs2_journal_dirty(handle, new_blk_bh);
6619
6620         if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6621                 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6622                 spin_lock(&new_oi->ip_lock);
6623                 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
6624                 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6625                 spin_unlock(&new_oi->ip_lock);
6626
6627                 ocfs2_journal_dirty(handle, args->new_bh);
6628         }
6629
6630 out_commit:
6631         ocfs2_commit_trans(osb, handle);
6632
6633 out:
6634         ocfs2_free_alloc_context(meta_ac);
6635         return ret;
6636 }
6637
6638 struct ocfs2_reflink_xattr_tree_args {
6639         struct ocfs2_xattr_reflink *reflink;
6640         struct buffer_head *old_blk_bh;
6641         struct buffer_head *new_blk_bh;
6642         struct ocfs2_xattr_bucket *old_bucket;
6643         struct ocfs2_xattr_bucket *new_bucket;
6644 };
6645
6646 /*
6647  * NOTE:
6648  * We have to handle the case that both old bucket and new bucket
6649  * will call this function to get the right ret_bh.
6650  * So The caller must give us the right bh.
6651  */
6652 static int ocfs2_get_reflink_xattr_value_root(struct super_block *sb,
6653                                         struct buffer_head *bh,
6654                                         struct ocfs2_xattr_header *xh,
6655                                         int offset,
6656                                         struct ocfs2_xattr_value_root **xv,
6657                                         struct buffer_head **ret_bh,
6658                                         void *para)
6659 {
6660         struct ocfs2_reflink_xattr_tree_args *args =
6661                         (struct ocfs2_reflink_xattr_tree_args *)para;
6662         struct ocfs2_xattr_bucket *bucket;
6663
6664         if (bh == args->old_bucket->bu_bhs[0])
6665                 bucket = args->old_bucket;
6666         else
6667                 bucket = args->new_bucket;
6668
6669         return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6670                                                xv, ret_bh);
6671 }
6672
6673 struct ocfs2_value_tree_metas {
6674         int num_metas;
6675         int credits;
6676         int num_recs;
6677 };
6678
6679 static int ocfs2_value_tree_metas_in_bucket(struct super_block *sb,
6680                                         struct buffer_head *bh,
6681                                         struct ocfs2_xattr_header *xh,
6682                                         int offset,
6683                                         struct ocfs2_xattr_value_root **xv,
6684                                         struct buffer_head **ret_bh,
6685                                         void *para)
6686 {
6687         struct ocfs2_xattr_bucket *bucket =
6688                                 (struct ocfs2_xattr_bucket *)para;
6689
6690         return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6691                                                xv, ret_bh);
6692 }
6693
6694 static int ocfs2_calc_value_tree_metas(struct inode *inode,
6695                                       struct ocfs2_xattr_bucket *bucket,
6696                                       void *para)
6697 {
6698         struct ocfs2_value_tree_metas *metas =
6699                         (struct ocfs2_value_tree_metas *)para;
6700         struct ocfs2_xattr_header *xh =
6701                         (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6702
6703         /* Add the credits for this bucket first. */
6704         metas->credits += bucket->bu_blocks;
6705         return ocfs2_value_metas_in_xattr_header(inode->i_sb, bucket->bu_bhs[0],
6706                                         xh, &metas->num_metas,
6707                                         &metas->credits, &metas->num_recs,
6708                                         ocfs2_value_tree_metas_in_bucket,
6709                                         bucket);
6710 }
6711
6712 /*
6713  * Given a xattr extent rec starting from blkno and having len clusters,
6714  * iterate all the buckets calculate how much metadata we need for reflinking
6715  * all the ocfs2_xattr_value_root and lock the allocators accordingly.
6716  */
6717 static int ocfs2_lock_reflink_xattr_rec_allocators(
6718                                 struct ocfs2_reflink_xattr_tree_args *args,
6719                                 struct ocfs2_extent_tree *xt_et,
6720                                 u64 blkno, u32 len, int *credits,
6721                                 struct ocfs2_alloc_context **meta_ac,
6722                                 struct ocfs2_alloc_context **data_ac)
6723 {
6724         int ret, num_free_extents;
6725         struct ocfs2_value_tree_metas metas;
6726         struct ocfs2_super *osb = OCFS2_SB(args->reflink->old_inode->i_sb);
6727         struct ocfs2_refcount_block *rb;
6728
6729         memset(&metas, 0, sizeof(metas));
6730
6731         ret = ocfs2_iterate_xattr_buckets(args->reflink->old_inode, blkno, len,
6732                                           ocfs2_calc_value_tree_metas, &metas);
6733         if (ret) {
6734                 mlog_errno(ret);
6735                 goto out;
6736         }
6737
6738         *credits = metas.credits;
6739
6740         /*
6741          * Calculate we need for refcount tree change.
6742          *
6743          * We need to add/modify num_recs in refcount tree, so just calculate
6744          * an approximate number we need for refcount tree change.
6745          * Sometimes we need to split the tree, and after split,  half recs
6746          * will be moved to the new block, and a new block can only provide
6747          * half number of recs. So we multiple new blocks by 2.
6748          * In the end, we have to add credits for modifying the already
6749          * existed refcount block.
6750          */
6751         rb = (struct ocfs2_refcount_block *)args->reflink->ref_root_bh->b_data;
6752         metas.num_recs =
6753                 (metas.num_recs + ocfs2_refcount_recs_per_rb(osb->sb) - 1) /
6754                  ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6755         metas.num_metas += metas.num_recs;
6756         *credits += metas.num_recs +
6757                     metas.num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6758         if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6759                 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6760                             le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6761         else
6762                 *credits += 1;
6763
6764         /* count in the xattr tree change. */
6765         num_free_extents = ocfs2_num_free_extents(osb, xt_et);
6766         if (num_free_extents < 0) {
6767                 ret = num_free_extents;
6768                 mlog_errno(ret);
6769                 goto out;
6770         }
6771
6772         if (num_free_extents < len)
6773                 metas.num_metas += ocfs2_extend_meta_needed(xt_et->et_root_el);
6774
6775         *credits += ocfs2_calc_extend_credits(osb->sb,
6776                                               xt_et->et_root_el, len);
6777
6778         if (metas.num_metas) {
6779                 ret = ocfs2_reserve_new_metadata_blocks(osb, metas.num_metas,
6780                                                         meta_ac);
6781                 if (ret) {
6782                         mlog_errno(ret);
6783                         goto out;
6784                 }
6785         }
6786
6787         if (len) {
6788                 ret = ocfs2_reserve_clusters(osb, len, data_ac);
6789                 if (ret)
6790                         mlog_errno(ret);
6791         }
6792 out:
6793         if (ret) {
6794                 if (*meta_ac) {
6795                         ocfs2_free_alloc_context(*meta_ac);
6796                         meta_ac = NULL;
6797                 }
6798         }
6799
6800         return ret;
6801 }
6802
6803 static int ocfs2_reflink_xattr_bucket(handle_t *handle,
6804                                 u64 blkno, u64 new_blkno, u32 clusters,
6805                                 u32 *cpos, int num_buckets,
6806                                 struct ocfs2_alloc_context *meta_ac,
6807                                 struct ocfs2_alloc_context *data_ac,
6808                                 struct ocfs2_reflink_xattr_tree_args *args)
6809 {
6810         int i, j, ret = 0;
6811         struct super_block *sb = args->reflink->old_inode->i_sb;
6812         int bpb = args->old_bucket->bu_blocks;
6813         struct ocfs2_xattr_value_buf vb = {
6814                 .vb_access = ocfs2_journal_access,
6815         };
6816
6817         for (i = 0; i < num_buckets; i++, blkno += bpb, new_blkno += bpb) {
6818                 ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6819                 if (ret) {
6820                         mlog_errno(ret);
6821                         break;
6822                 }
6823
6824                 ret = ocfs2_init_xattr_bucket(args->new_bucket, new_blkno);
6825                 if (ret) {
6826                         mlog_errno(ret);
6827                         break;
6828                 }
6829
6830                 ret = ocfs2_xattr_bucket_journal_access(handle,
6831                                                 args->new_bucket,
6832                                                 OCFS2_JOURNAL_ACCESS_CREATE);
6833                 if (ret) {
6834                         mlog_errno(ret);
6835                         break;
6836                 }
6837
6838                 for (j = 0; j < bpb; j++)
6839                         memcpy(bucket_block(args->new_bucket, j),
6840                                bucket_block(args->old_bucket, j),
6841                                sb->s_blocksize);
6842
6843                 /*
6844                  * Record the start cpos so that we can use it to initialize
6845                  * our xattr tree we also set the xh_num_bucket for the new
6846                  * bucket.
6847                  */
6848                 if (i == 0) {
6849                         *cpos = le32_to_cpu(bucket_xh(args->new_bucket)->
6850                                             xh_entries[0].xe_name_hash);
6851                         bucket_xh(args->new_bucket)->xh_num_buckets =
6852                                 cpu_to_le16(num_buckets);
6853                 }
6854
6855                 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6856
6857                 ret = ocfs2_reflink_xattr_header(handle, args->reflink,
6858                                         args->old_bucket->bu_bhs[0],
6859                                         bucket_xh(args->old_bucket),
6860                                         args->new_bucket->bu_bhs[0],
6861                                         bucket_xh(args->new_bucket),
6862                                         &vb, meta_ac,
6863                                         ocfs2_get_reflink_xattr_value_root,
6864                                         args);
6865                 if (ret) {
6866                         mlog_errno(ret);
6867                         break;
6868                 }
6869
6870                 /*
6871                  * Re-access and dirty the bucket to calculate metaecc.
6872                  * Because we may extend the transaction in reflink_xattr_header
6873                  * which will let the already accessed block gone.
6874                  */
6875                 ret = ocfs2_xattr_bucket_journal_access(handle,
6876                                                 args->new_bucket,
6877                                                 OCFS2_JOURNAL_ACCESS_WRITE);
6878                 if (ret) {
6879                         mlog_errno(ret);
6880                         break;
6881                 }
6882
6883                 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6884
6885                 ocfs2_xattr_bucket_relse(args->old_bucket);
6886                 ocfs2_xattr_bucket_relse(args->new_bucket);
6887         }
6888
6889         ocfs2_xattr_bucket_relse(args->old_bucket);
6890         ocfs2_xattr_bucket_relse(args->new_bucket);
6891         return ret;
6892 }
6893
6894 static int ocfs2_reflink_xattr_buckets(handle_t *handle,
6895                                 struct inode *inode,
6896                                 struct ocfs2_reflink_xattr_tree_args *args,
6897                                 struct ocfs2_extent_tree *et,
6898                                 struct ocfs2_alloc_context *meta_ac,
6899                                 struct ocfs2_alloc_context *data_ac,
6900                                 u64 blkno, u32 cpos, u32 len)
6901 {
6902         int ret, first_inserted = 0;
6903         u32 p_cluster, num_clusters, reflink_cpos = 0;
6904         u64 new_blkno;
6905         unsigned int num_buckets, reflink_buckets;
6906         unsigned int bpc =
6907                 ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
6908
6909         ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6910         if (ret) {
6911                 mlog_errno(ret);
6912                 goto out;
6913         }
6914         num_buckets = le16_to_cpu(bucket_xh(args->old_bucket)->xh_num_buckets);
6915         ocfs2_xattr_bucket_relse(args->old_bucket);
6916
6917         while (len && num_buckets) {
6918                 ret = ocfs2_claim_clusters(handle, data_ac,
6919                                            1, &p_cluster, &num_clusters);
6920                 if (ret) {
6921                         mlog_errno(ret);
6922                         goto out;
6923                 }
6924
6925                 new_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
6926                 reflink_buckets = min(num_buckets, bpc * num_clusters);
6927
6928                 ret = ocfs2_reflink_xattr_bucket(handle, blkno,
6929                                                  new_blkno, num_clusters,
6930                                                  &reflink_cpos, reflink_buckets,
6931                                                  meta_ac, data_ac, args);
6932                 if (ret) {
6933                         mlog_errno(ret);
6934                         goto out;
6935                 }
6936
6937                 /*
6938                  * For the 1st allocated cluster, we make it use the same cpos
6939                  * so that the xattr tree looks the same as the original one
6940                  * in the most case.
6941                  */
6942                 if (!first_inserted) {
6943                         reflink_cpos = cpos;
6944                         first_inserted = 1;
6945                 }
6946                 ret = ocfs2_insert_extent(handle, et, reflink_cpos, new_blkno,
6947                                           num_clusters, 0, meta_ac);
6948                 if (ret)
6949                         mlog_errno(ret);
6950
6951                 trace_ocfs2_reflink_xattr_buckets((unsigned long long)new_blkno,
6952                                                   num_clusters, reflink_cpos);
6953
6954                 len -= num_clusters;
6955                 blkno += ocfs2_clusters_to_blocks(inode->i_sb, num_clusters);
6956                 num_buckets -= reflink_buckets;
6957         }
6958 out:
6959         return ret;
6960 }
6961
6962 /*
6963  * Create the same xattr extent record in the new inode's xattr tree.
6964  */
6965 static int ocfs2_reflink_xattr_rec(struct inode *inode,
6966                                    struct buffer_head *root_bh,
6967                                    u64 blkno,
6968                                    u32 cpos,
6969                                    u32 len,
6970                                    void *para)
6971 {
6972         int ret, credits = 0;
6973         handle_t *handle;
6974         struct ocfs2_reflink_xattr_tree_args *args =
6975                         (struct ocfs2_reflink_xattr_tree_args *)para;
6976         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6977         struct ocfs2_alloc_context *meta_ac = NULL;
6978         struct ocfs2_alloc_context *data_ac = NULL;
6979         struct ocfs2_extent_tree et;
6980
6981         trace_ocfs2_reflink_xattr_rec((unsigned long long)blkno, len);
6982
6983         ocfs2_init_xattr_tree_extent_tree(&et,
6984                                           INODE_CACHE(args->reflink->new_inode),
6985                                           args->new_blk_bh);
6986
6987         ret = ocfs2_lock_reflink_xattr_rec_allocators(args, &et, blkno,
6988                                                       len, &credits,
6989                                                       &meta_ac, &data_ac);
6990         if (ret) {
6991                 mlog_errno(ret);
6992                 goto out;
6993         }
6994
6995         handle = ocfs2_start_trans(osb, credits);
6996         if (IS_ERR(handle)) {
6997                 ret = PTR_ERR(handle);
6998                 mlog_errno(ret);
6999                 goto out;
7000         }
7001
7002         ret = ocfs2_reflink_xattr_buckets(handle, inode, args, &et,
7003                                           meta_ac, data_ac,
7004                                           blkno, cpos, len);
7005         if (ret)
7006                 mlog_errno(ret);
7007
7008         ocfs2_commit_trans(osb, handle);
7009
7010 out:
7011         if (meta_ac)
7012                 ocfs2_free_alloc_context(meta_ac);
7013         if (data_ac)
7014                 ocfs2_free_alloc_context(data_ac);
7015         return ret;
7016 }
7017
7018 /*
7019  * Create reflinked xattr buckets.
7020  * We will add bucket one by one, and refcount all the xattrs in the bucket
7021  * if they are stored outside.
7022  */
7023 static int ocfs2_reflink_xattr_tree(struct ocfs2_xattr_reflink *args,
7024                                     struct buffer_head *blk_bh,
7025                                     struct buffer_head *new_blk_bh)
7026 {
7027         int ret;
7028         struct ocfs2_reflink_xattr_tree_args para;
7029
7030         memset(&para, 0, sizeof(para));
7031         para.reflink = args;
7032         para.old_blk_bh = blk_bh;
7033         para.new_blk_bh = new_blk_bh;
7034
7035         para.old_bucket = ocfs2_xattr_bucket_new(args->old_inode);
7036         if (!para.old_bucket) {
7037                 mlog_errno(-ENOMEM);
7038                 return -ENOMEM;
7039         }
7040
7041         para.new_bucket = ocfs2_xattr_bucket_new(args->new_inode);
7042         if (!para.new_bucket) {
7043                 ret = -ENOMEM;
7044                 mlog_errno(ret);
7045                 goto out;
7046         }
7047
7048         ret = ocfs2_iterate_xattr_index_block(args->old_inode, blk_bh,
7049                                               ocfs2_reflink_xattr_rec,
7050                                               &para);
7051         if (ret)
7052                 mlog_errno(ret);
7053
7054 out:
7055         ocfs2_xattr_bucket_free(para.old_bucket);
7056         ocfs2_xattr_bucket_free(para.new_bucket);
7057         return ret;
7058 }
7059
7060 static int ocfs2_reflink_xattr_in_block(struct ocfs2_xattr_reflink *args,
7061                                         struct buffer_head *blk_bh)
7062 {
7063         int ret, indexed = 0;
7064         struct buffer_head *new_blk_bh = NULL;
7065         struct ocfs2_xattr_block *xb =
7066                         (struct ocfs2_xattr_block *)blk_bh->b_data;
7067
7068
7069         if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)
7070                 indexed = 1;
7071
7072         ret = ocfs2_create_empty_xattr_block(args->new_inode, args->new_bh,
7073                                              &new_blk_bh, indexed);
7074         if (ret) {
7075                 mlog_errno(ret);
7076                 goto out;
7077         }
7078
7079         if (!indexed)
7080                 ret = ocfs2_reflink_xattr_block(args, blk_bh, new_blk_bh);
7081         else
7082                 ret = ocfs2_reflink_xattr_tree(args, blk_bh, new_blk_bh);
7083         if (ret)
7084                 mlog_errno(ret);
7085
7086 out:
7087         brelse(new_blk_bh);
7088         return ret;
7089 }
7090
7091 static int ocfs2_reflink_xattr_no_security(struct ocfs2_xattr_entry *xe)
7092 {
7093         int type = ocfs2_xattr_get_type(xe);
7094
7095         return type != OCFS2_XATTR_INDEX_SECURITY &&
7096                type != OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS &&
7097                type != OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
7098 }
7099
7100 int ocfs2_reflink_xattrs(struct inode *old_inode,
7101                          struct buffer_head *old_bh,
7102                          struct inode *new_inode,
7103                          struct buffer_head *new_bh,
7104                          bool preserve_security)
7105 {
7106         int ret;
7107         struct ocfs2_xattr_reflink args;
7108         struct ocfs2_inode_info *oi = OCFS2_I(old_inode);
7109         struct ocfs2_dinode *di = (struct ocfs2_dinode *)old_bh->b_data;
7110         struct buffer_head *blk_bh = NULL;
7111         struct ocfs2_cached_dealloc_ctxt dealloc;
7112         struct ocfs2_refcount_tree *ref_tree;
7113         struct buffer_head *ref_root_bh = NULL;
7114
7115         ret = ocfs2_lock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7116                                        le64_to_cpu(di->i_refcount_loc),
7117                                        1, &ref_tree, &ref_root_bh);
7118         if (ret) {
7119                 mlog_errno(ret);
7120                 goto out;
7121         }
7122
7123         ocfs2_init_dealloc_ctxt(&dealloc);
7124
7125         args.old_inode = old_inode;
7126         args.new_inode = new_inode;
7127         args.old_bh = old_bh;
7128         args.new_bh = new_bh;
7129         args.ref_ci = &ref_tree->rf_ci;
7130         args.ref_root_bh = ref_root_bh;
7131         args.dealloc = &dealloc;
7132         if (preserve_security)
7133                 args.xattr_reflinked = NULL;
7134         else
7135                 args.xattr_reflinked = ocfs2_reflink_xattr_no_security;
7136
7137         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
7138                 ret = ocfs2_reflink_xattr_inline(&args);
7139                 if (ret) {
7140                         mlog_errno(ret);
7141                         goto out_unlock;
7142                 }
7143         }
7144
7145         if (!di->i_xattr_loc)
7146                 goto out_unlock;
7147
7148         ret = ocfs2_read_xattr_block(old_inode, le64_to_cpu(di->i_xattr_loc),
7149                                      &blk_bh);
7150         if (ret < 0) {
7151                 mlog_errno(ret);
7152                 goto out_unlock;
7153         }
7154
7155         ret = ocfs2_reflink_xattr_in_block(&args, blk_bh);
7156         if (ret)
7157                 mlog_errno(ret);
7158
7159         brelse(blk_bh);
7160
7161 out_unlock:
7162         ocfs2_unlock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7163                                    ref_tree, 1);
7164         brelse(ref_root_bh);
7165
7166         if (ocfs2_dealloc_has_cluster(&dealloc)) {
7167                 ocfs2_schedule_truncate_log_flush(OCFS2_SB(old_inode->i_sb), 1);
7168                 ocfs2_run_deallocs(OCFS2_SB(old_inode->i_sb), &dealloc);
7169         }
7170
7171 out:
7172         return ret;
7173 }
7174
7175 /*
7176  * Initialize security and acl for a already created inode.
7177  * Used for reflink a non-preserve-security file.
7178  *
7179  * It uses common api like ocfs2_xattr_set, so the caller
7180  * must not hold any lock expect i_mutex.
7181  */
7182 int ocfs2_init_security_and_acl(struct inode *dir,
7183                                 struct inode *inode,
7184                                 const struct qstr *qstr)
7185 {
7186         int ret = 0;
7187         struct buffer_head *dir_bh = NULL;
7188         struct ocfs2_security_xattr_info si = {
7189                 .enable = 1,
7190         };
7191
7192         ret = ocfs2_init_security_get(inode, dir, qstr, &si);
7193         if (!ret) {
7194                 ret = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
7195                                       si.name, si.value, si.value_len,
7196                                       XATTR_CREATE);
7197                 if (ret) {
7198                         mlog_errno(ret);
7199                         goto leave;
7200                 }
7201         } else if (ret != -EOPNOTSUPP) {
7202                 mlog_errno(ret);
7203                 goto leave;
7204         }
7205
7206         ret = ocfs2_inode_lock(dir, &dir_bh, 0);
7207         if (ret) {
7208                 mlog_errno(ret);
7209                 goto leave;
7210         }
7211
7212         ret = ocfs2_init_acl(NULL, inode, dir, NULL, dir_bh, NULL, NULL);
7213         if (ret)
7214                 mlog_errno(ret);
7215
7216         ocfs2_inode_unlock(dir, 0);
7217         brelse(dir_bh);
7218 leave:
7219         return ret;
7220 }
7221 /*
7222  * 'security' attributes support
7223  */
7224 static size_t ocfs2_xattr_security_list(struct dentry *dentry, char *list,
7225                                         size_t list_size, const char *name,
7226                                         size_t name_len, int type)
7227 {
7228         const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
7229         const size_t total_len = prefix_len + name_len + 1;
7230
7231         if (list && total_len <= list_size) {
7232                 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
7233                 memcpy(list + prefix_len, name, name_len);
7234                 list[prefix_len + name_len] = '\0';
7235         }
7236         return total_len;
7237 }
7238
7239 static int ocfs2_xattr_security_get(struct dentry *dentry, const char *name,
7240                                     void *buffer, size_t size, int type)
7241 {
7242         if (strcmp(name, "") == 0)
7243                 return -EINVAL;
7244         return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7245                                name, buffer, size);
7246 }
7247
7248 static int ocfs2_xattr_security_set(struct dentry *dentry, const char *name,
7249                 const void *value, size_t size, int flags, int type)
7250 {
7251         if (strcmp(name, "") == 0)
7252                 return -EINVAL;
7253
7254         return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7255                                name, value, size, flags);
7256 }
7257
7258 int ocfs2_init_security_get(struct inode *inode,
7259                             struct inode *dir,
7260                             const struct qstr *qstr,
7261                             struct ocfs2_security_xattr_info *si)
7262 {
7263         /* check whether ocfs2 support feature xattr */
7264         if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
7265                 return -EOPNOTSUPP;
7266         return security_inode_init_security(inode, dir, qstr, &si->name,
7267                                             &si->value, &si->value_len);
7268 }
7269
7270 int ocfs2_init_security_set(handle_t *handle,
7271                             struct inode *inode,
7272                             struct buffer_head *di_bh,
7273                             struct ocfs2_security_xattr_info *si,
7274                             struct ocfs2_alloc_context *xattr_ac,
7275                             struct ocfs2_alloc_context *data_ac)
7276 {
7277         return ocfs2_xattr_set_handle(handle, inode, di_bh,
7278                                      OCFS2_XATTR_INDEX_SECURITY,
7279                                      si->name, si->value, si->value_len, 0,
7280                                      xattr_ac, data_ac);
7281 }
7282
7283 const struct xattr_handler ocfs2_xattr_security_handler = {
7284         .prefix = XATTR_SECURITY_PREFIX,
7285         .list   = ocfs2_xattr_security_list,
7286         .get    = ocfs2_xattr_security_get,
7287         .set    = ocfs2_xattr_security_set,
7288 };
7289
7290 /*
7291  * 'trusted' attributes support
7292  */
7293 static size_t ocfs2_xattr_trusted_list(struct dentry *dentry, char *list,
7294                                        size_t list_size, const char *name,
7295                                        size_t name_len, int type)
7296 {
7297         const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
7298         const size_t total_len = prefix_len + name_len + 1;
7299
7300         if (list && total_len <= list_size) {
7301                 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
7302                 memcpy(list + prefix_len, name, name_len);
7303                 list[prefix_len + name_len] = '\0';
7304         }
7305         return total_len;
7306 }
7307
7308 static int ocfs2_xattr_trusted_get(struct dentry *dentry, const char *name,
7309                 void *buffer, size_t size, int type)
7310 {
7311         if (strcmp(name, "") == 0)
7312                 return -EINVAL;
7313         return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7314                                name, buffer, size);
7315 }
7316
7317 static int ocfs2_xattr_trusted_set(struct dentry *dentry, const char *name,
7318                 const void *value, size_t size, int flags, int type)
7319 {
7320         if (strcmp(name, "") == 0)
7321                 return -EINVAL;
7322
7323         return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7324                                name, value, size, flags);
7325 }
7326
7327 const struct xattr_handler ocfs2_xattr_trusted_handler = {
7328         .prefix = XATTR_TRUSTED_PREFIX,
7329         .list   = ocfs2_xattr_trusted_list,
7330         .get    = ocfs2_xattr_trusted_get,
7331         .set    = ocfs2_xattr_trusted_set,
7332 };
7333
7334 /*
7335  * 'user' attributes support
7336  */
7337 static size_t ocfs2_xattr_user_list(struct dentry *dentry, char *list,
7338                                     size_t list_size, const char *name,
7339                                     size_t name_len, int type)
7340 {
7341         const size_t prefix_len = XATTR_USER_PREFIX_LEN;
7342         const size_t total_len = prefix_len + name_len + 1;
7343         struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7344
7345         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7346                 return 0;
7347
7348         if (list && total_len <= list_size) {
7349                 memcpy(list, XATTR_USER_PREFIX, prefix_len);
7350                 memcpy(list + prefix_len, name, name_len);
7351                 list[prefix_len + name_len] = '\0';
7352         }
7353         return total_len;
7354 }
7355
7356 static int ocfs2_xattr_user_get(struct dentry *dentry, const char *name,
7357                 void *buffer, size_t size, int type)
7358 {
7359         struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7360
7361         if (strcmp(name, "") == 0)
7362                 return -EINVAL;
7363         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7364                 return -EOPNOTSUPP;
7365         return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_USER, name,
7366                                buffer, size);
7367 }
7368
7369 static int ocfs2_xattr_user_set(struct dentry *dentry, const char *name,
7370                 const void *value, size_t size, int flags, int type)
7371 {
7372         struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7373
7374         if (strcmp(name, "") == 0)
7375                 return -EINVAL;
7376         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7377                 return -EOPNOTSUPP;
7378
7379         return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_USER,
7380                                name, value, size, flags);
7381 }
7382
7383 const struct xattr_handler ocfs2_xattr_user_handler = {
7384         .prefix = XATTR_USER_PREFIX,
7385         .list   = ocfs2_xattr_user_list,
7386         .get    = ocfs2_xattr_user_get,
7387         .set    = ocfs2_xattr_user_set,
7388 };