fs/ocfs2/namei.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * namei.c
   5  *
   6  * Create and rename file, directory, symlinks
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  *  Portions of this code from linux/fs/ext3/dir.c
  11  *
  12  *  Copyright (C) 1992, 1993, 1994, 1995
  13  *  Remy Card (card@masi.ibp.fr)
  14  *  Laboratoire MASI - Institut Blaise pascal
  15  *  Universite Pierre et Marie Curie (Paris VI)
  16  *
  17  *   from
  18  *
  19  *   linux/fs/minix/dir.c
  20  *
  21  *   Copyright (C) 1991, 1992 Linux Torvalds
  22  *
  23  * This program is free software; you can redistribute it and/or
  24  * modify it under the terms of the GNU General Public
  25  * License as published by the Free Software Foundation; either
  26  * version 2 of the License, or (at your option) any later version.
  27  *
  28  * This program is distributed in the hope that it will be useful,
  29  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  30  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  31  * General Public License for more details.
  32  *
  33  * You should have received a copy of the GNU General Public
  34  * License along with this program; if not, write to the
  35  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  36  * Boston, MA 021110-1307, USA.
  37  */
  38
  39 #include <linux/fs.h>
  40 #include <linux/types.h>
  41 #include <linux/slab.h>
  42 #include <linux/highmem.h>
  43
  44 #define MLOG_MASK_PREFIX ML_NAMEI
  45 #include <cluster/masklog.h>
  46
  47 #include "ocfs2.h"
  48
  49 #include "alloc.h"
  50 #include "dcache.h"
  51 #include "dir.h"
  52 #include "dlmglue.h"
  53 #include "extent_map.h"
  54 #include "file.h"
  55 #include "inode.h"
  56 #include "journal.h"
  57 #include "namei.h"
  58 #include "suballoc.h"
  59 #include "super.h"
  60 #include "symlink.h"
  61 #include "sysfile.h"
  62 #include "uptodate.h"
  63 #include "vote.h"
  64
  65 #include "buffer_head_io.h"
  66
  67 #define NAMEI_RA_CHUNKS  2
  68 #define NAMEI_RA_BLOCKS  4
  69 #define NAMEI_RA_SIZE        (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
  70 #define NAMEI_RA_INDEX(c,b)  (((c) * NAMEI_RA_BLOCKS) + (b))
  71
  72 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
  73                                         struct inode *dir,
  74                                         const char *name, int namelen,
  75                                         unsigned long offset,
  76                                         struct ocfs2_dir_entry **res_dir);
  77
  78 static int ocfs2_delete_entry(handle_t *handle,
  79                               struct inode *dir,
  80                               struct ocfs2_dir_entry *de_del,
  81                               struct buffer_head *bh);
  82
  83 static int __ocfs2_add_entry(handle_t *handle,
  84                              struct inode *dir,
  85                              const char *name, int namelen,
  86                              struct inode *inode, u64 blkno,
  87                              struct buffer_head *parent_fe_bh,
  88                              struct buffer_head *insert_bh);
  89
  90 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
  91                               struct inode *dir,
  92                               struct dentry *dentry, int mode,
  93                               dev_t dev,
  94                               struct buffer_head **new_fe_bh,
  95                               struct buffer_head *parent_fe_bh,
  96                               handle_t *handle,
  97                               struct inode **ret_inode,
  98                               struct ocfs2_alloc_context *inode_ac);
  99
 100 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
 101                               handle_t *handle,
 102                               struct inode *parent,
 103                               struct inode *inode,
 104                               struct buffer_head *fe_bh,
 105                               struct ocfs2_alloc_context *data_ac);
 106
 107 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
 108                                     struct inode **ret_orphan_dir,
 109                                     struct inode *inode,
 110                                     char *name,
 111                                     struct buffer_head **de_bh);
 112
 113 static int ocfs2_orphan_add(struct ocfs2_super *osb,
 114                             handle_t *handle,
 115                             struct inode *inode,
 116                             struct ocfs2_dinode *fe,
 117                             char *name,
 118                             struct buffer_head *de_bh,
 119                             struct inode *orphan_dir_inode);
 120
 121 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
 122                                      handle_t *handle,
 123                                      struct inode *inode,
 124                                      const char *symname);
 125
 126 static inline int ocfs2_add_entry(handle_t *handle,
 127                                   struct dentry *dentry,
 128                                   struct inode *inode, u64 blkno,
 129                                   struct buffer_head *parent_fe_bh,
 130                                   struct buffer_head *insert_bh)
 131 {
 132         return __ocfs2_add_entry(handle, dentry->d_parent->d_inode,
 133                                  dentry->d_name.name, dentry->d_name.len,
 134                                  inode, blkno, parent_fe_bh, insert_bh);
 135 }
 136
 137 /* An orphan dir name is an 8 byte value, printed as a hex string */
 138 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
 139
 140 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
 141                                    struct nameidata *nd)
 142 {
 143         int status;
 144         u64 blkno;
 145         struct buffer_head *dirent_bh = NULL;
 146         struct inode *inode = NULL;
 147         struct dentry *ret;
 148         struct ocfs2_dir_entry *dirent;
 149         struct ocfs2_inode_info *oi;
 150
 151         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 152                    dentry->d_name.len, dentry->d_name.name);
 153
 154         if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
 155                 ret = ERR_PTR(-ENAMETOOLONG);
 156                 goto bail;
 157         }
 158
 159         mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len,
 160              dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno);
 161
 162         status = ocfs2_meta_lock(dir, NULL, 0);
 163         if (status < 0) {
 164                 if (status != -ENOENT)
 165                         mlog_errno(status);
 166                 ret = ERR_PTR(status);
 167                 goto bail;
 168         }
 169
 170         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 171                                           dentry->d_name.len, &blkno,
 172                                           dir, &dirent_bh, &dirent);
 173         if (status < 0)
 174                 goto bail_add;
 175
 176         inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0);
 177         if (IS_ERR(inode)) {
 178                 mlog(ML_ERROR, "Unable to create inode %llu\n",
 179                      (unsigned long long)blkno);
 180                 ret = ERR_PTR(-EACCES);
 181                 goto bail_unlock;
 182         }
 183
 184         oi = OCFS2_I(inode);
 185         /* Clear any orphaned state... If we were able to look up the
 186          * inode from a directory, it certainly can't be orphaned. We
 187          * might have the bad state from a node which intended to
 188          * orphan this inode but crashed before it could commit the
 189          * unlink. */
 190         spin_lock(&oi->ip_lock);
 191         oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
 192         oi->ip_orphaned_slot = OCFS2_INVALID_SLOT;
 193         spin_unlock(&oi->ip_lock);
 194
 195 bail_add:
 196         dentry->d_op = &ocfs2_dentry_ops;
 197         ret = d_splice_alias(inode, dentry);
 198
 199         if (inode) {
 200                 /*
 201                  * If d_splice_alias() finds a DCACHE_DISCONNECTED
 202                  * dentry, it will d_move() it on top of ourse. The
 203                  * return value will indicate this however, so in
 204                  * those cases, we switch them around for the locking
 205                  * code.
 206                  *
 207                  * NOTE: This dentry already has ->d_op set from
 208                  * ocfs2_get_parent() and ocfs2_get_dentry()
 209                  */
 210                 if (ret)
 211                         dentry = ret;
 212
 213                 status = ocfs2_dentry_attach_lock(dentry, inode,
 214                                                   OCFS2_I(dir)->ip_blkno);
 215                 if (status) {
 216                         mlog_errno(status);
 217                         ret = ERR_PTR(status);
 218                         goto bail_unlock;
 219                 }
 220         }
 221
 222 bail_unlock:
 223         /* Don't drop the cluster lock until *after* the d_add --
 224          * unlink on another node will message us to remove that
 225          * dentry under this lock so otherwise we can race this with
 226          * the vote thread and have a stale dentry. */
 227         ocfs2_meta_unlock(dir, 0);
 228
 229 bail:
 230         if (dirent_bh)
 231                 brelse(dirent_bh);
 232
 233         mlog_exit_ptr(ret);
 234
 235         return ret;
 236 }
 237
 238 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
 239                               handle_t *handle,
 240                               struct inode *parent,
 241                               struct inode *inode,
 242                               struct buffer_head *fe_bh,
 243                               struct ocfs2_alloc_context *data_ac)
 244 {
 245         int status;
 246         struct buffer_head *new_bh = NULL;
 247         struct ocfs2_dir_entry *de = NULL;
 248
 249         mlog_entry_void();
 250
 251         status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
 252                                      data_ac, NULL, &new_bh);
 253         if (status < 0) {
 254                 mlog_errno(status);
 255                 goto bail;
 256         }
 257
 258         ocfs2_set_new_buffer_uptodate(inode, new_bh);
 259
 260         status = ocfs2_journal_access(handle, inode, new_bh,
 261                                       OCFS2_JOURNAL_ACCESS_CREATE);
 262         if (status < 0) {
 263                 mlog_errno(status);
 264                 goto bail;
 265         }
 266         memset(new_bh->b_data, 0, osb->sb->s_blocksize);
 267
 268         de = (struct ocfs2_dir_entry *) new_bh->b_data;
 269         de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
 270         de->name_len = 1;
 271         de->rec_len =
 272                 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
 273         strcpy(de->name, ".");
 274         ocfs2_set_de_type(de, S_IFDIR);
 275         de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
 276         de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
 277         de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize -
 278                                   OCFS2_DIR_REC_LEN(1));
 279         de->name_len = 2;
 280         strcpy(de->name, "..");
 281         ocfs2_set_de_type(de, S_IFDIR);
 282
 283         status = ocfs2_journal_dirty(handle, new_bh);
 284         if (status < 0) {
 285                 mlog_errno(status);
 286                 goto bail;
 287         }
 288
 289         i_size_write(inode, inode->i_sb->s_blocksize);
 290         inode->i_nlink = 2;
 291         inode->i_blocks = ocfs2_align_bytes_to_sectors(inode->i_sb->s_blocksize);
 292         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 293         if (status < 0) {
 294                 mlog_errno(status);
 295                 goto bail;
 296         }
 297
 298         status = 0;
 299 bail:
 300         if (new_bh)
 301                 brelse(new_bh);
 302
 303         mlog_exit(status);
 304         return status;
 305 }
 306
 307 static int ocfs2_mknod(struct inode *dir,
 308                        struct dentry *dentry,
 309                        int mode,
 310                        dev_t dev)
 311 {
 312         int status = 0;
 313         struct buffer_head *parent_fe_bh = NULL;
 314         handle_t *handle = NULL;
 315         struct ocfs2_super *osb;
 316         struct ocfs2_dinode *dirfe;
 317         struct buffer_head *new_fe_bh = NULL;
 318         struct buffer_head *de_bh = NULL;
 319         struct inode *inode = NULL;
 320         struct ocfs2_alloc_context *inode_ac = NULL;
 321         struct ocfs2_alloc_context *data_ac = NULL;
 322
 323         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 324                    (unsigned long)dev, dentry->d_name.len,
 325                    dentry->d_name.name);
 326
 327         /* get our super block */
 328         osb = OCFS2_SB(dir->i_sb);
 329
 330         status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
 331         if (status < 0) {
 332                 if (status != -ENOENT)
 333                         mlog_errno(status);
 334                 return status;
 335         }
 336
 337         if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
 338                 status = -EMLINK;
 339                 goto leave;
 340         }
 341
 342         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
 343         if (!dirfe->i_links_count) {
 344                 /* can't make a file in a deleted directory. */
 345                 status = -ENOENT;
 346                 goto leave;
 347         }
 348
 349         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 350                                            dentry->d_name.len);
 351         if (status)
 352                 goto leave;
 353
 354         /* get a spot inside the dir. */
 355         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 356                                               dentry->d_name.name,
 357                                               dentry->d_name.len, &de_bh);
 358         if (status < 0) {
 359                 mlog_errno(status);
 360                 goto leave;
 361         }
 362
 363         /* reserve an inode spot */
 364         status = ocfs2_reserve_new_inode(osb, &inode_ac);
 365         if (status < 0) {
 366                 if (status != -ENOSPC)
 367                         mlog_errno(status);
 368                 goto leave;
 369         }
 370
 371         /* are we making a directory? If so, reserve a cluster for his
 372          * 1st extent. */
 373         if (S_ISDIR(mode)) {
 374                 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
 375                 if (status < 0) {
 376                         if (status != -ENOSPC)
 377                                 mlog_errno(status);
 378                         goto leave;
 379                 }
 380         }
 381
 382         handle = ocfs2_start_trans(osb, OCFS2_MKNOD_CREDITS);
 383         if (IS_ERR(handle)) {
 384                 status = PTR_ERR(handle);
 385                 handle = NULL;
 386                 mlog_errno(status);
 387                 goto leave;
 388         }
 389
 390         /* do the real work now. */
 391         status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
 392                                     &new_fe_bh, parent_fe_bh, handle,
 393                                     &inode, inode_ac);
 394         if (status < 0) {
 395                 mlog_errno(status);
 396                 goto leave;
 397         }
 398
 399         if (S_ISDIR(mode)) {
 400                 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
 401                                             new_fe_bh, data_ac);
 402                 if (status < 0) {
 403                         mlog_errno(status);
 404                         goto leave;
 405                 }
 406
 407                 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
 408                                               OCFS2_JOURNAL_ACCESS_WRITE);
 409                 if (status < 0) {
 410                         mlog_errno(status);
 411                         goto leave;
 412                 }
 413                 le16_add_cpu(&dirfe->i_links_count, 1);
 414                 status = ocfs2_journal_dirty(handle, parent_fe_bh);
 415                 if (status < 0) {
 416                         mlog_errno(status);
 417                         goto leave;
 418                 }
 419                 inc_nlink(dir);
 420         }
 421
 422         status = ocfs2_add_entry(handle, dentry, inode,
 423                                  OCFS2_I(inode)->ip_blkno, parent_fe_bh,
 424                                  de_bh);
 425         if (status < 0) {
 426                 mlog_errno(status);
 427                 goto leave;
 428         }
 429
 430         status = ocfs2_dentry_attach_lock(dentry, inode,
 431                                           OCFS2_I(dir)->ip_blkno);
 432         if (status) {
 433                 mlog_errno(status);
 434                 goto leave;
 435         }
 436
 437         insert_inode_hash(inode);
 438         dentry->d_op = &ocfs2_dentry_ops;
 439         d_instantiate(dentry, inode);
 440         status = 0;
 441 leave:
 442         if (handle)
 443                 ocfs2_commit_trans(osb, handle);
 444
 445         ocfs2_meta_unlock(dir, 1);
 446
 447         if (status == -ENOSPC)
 448                 mlog(0, "Disk is full\n");
 449
 450         if (new_fe_bh)
 451                 brelse(new_fe_bh);
 452
 453         if (de_bh)
 454                 brelse(de_bh);
 455
 456         if (parent_fe_bh)
 457                 brelse(parent_fe_bh);
 458
 459         if ((status < 0) && inode)
 460                 iput(inode);
 461
 462         if (inode_ac)
 463                 ocfs2_free_alloc_context(inode_ac);
 464
 465         if (data_ac)
 466                 ocfs2_free_alloc_context(data_ac);
 467
 468         mlog_exit(status);
 469
 470         return status;
 471 }
 472
 473 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 474                               struct inode *dir,
 475                               struct dentry *dentry, int mode,
 476                               dev_t dev,
 477                               struct buffer_head **new_fe_bh,
 478                               struct buffer_head *parent_fe_bh,
 479                               handle_t *handle,
 480                               struct inode **ret_inode,
 481                               struct ocfs2_alloc_context *inode_ac)
 482 {
 483         int status = 0;
 484         struct ocfs2_dinode *fe = NULL;
 485         struct ocfs2_extent_list *fel;
 486         u64 fe_blkno = 0;
 487         u16 suballoc_bit;
 488         struct inode *inode = NULL;
 489
 490         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 491                    (unsigned long)dev, dentry->d_name.len,
 492                    dentry->d_name.name);
 493
 494         *new_fe_bh = NULL;
 495         *ret_inode = NULL;
 496
 497         status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
 498                                        &fe_blkno);
 499         if (status < 0) {
 500                 mlog_errno(status);
 501                 goto leave;
 502         }
 503
 504         inode = new_inode(dir->i_sb);
 505         if (IS_ERR(inode)) {
 506                 status = PTR_ERR(inode);
 507                 mlog(ML_ERROR, "new_inode failed!\n");
 508                 goto leave;
 509         }
 510
 511         /* populate as many fields early on as possible - many of
 512          * these are used by the support functions here and in
 513          * callers. */
 514         inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
 515         OCFS2_I(inode)->ip_blkno = fe_blkno;
 516         if (S_ISDIR(mode))
 517                 inode->i_nlink = 2;
 518         else
 519                 inode->i_nlink = 1;
 520         inode->i_mode = mode;
 521         spin_lock(&osb->osb_lock);
 522         inode->i_generation = osb->s_next_generation++;
 523         spin_unlock(&osb->osb_lock);
 524
 525         *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
 526         if (!*new_fe_bh) {
 527                 status = -EIO;
 528                 mlog_errno(status);
 529                 goto leave;
 530         }
 531         ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
 532
 533         status = ocfs2_journal_access(handle, inode, *new_fe_bh,
 534                                       OCFS2_JOURNAL_ACCESS_CREATE);
 535         if (status < 0) {
 536                 mlog_errno(status);
 537                 goto leave;
 538         }
 539
 540         fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
 541         memset(fe, 0, osb->sb->s_blocksize);
 542
 543         fe->i_generation = cpu_to_le32(inode->i_generation);
 544         fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
 545         fe->i_blkno = cpu_to_le64(fe_blkno);
 546         fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
 547         fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
 548         fe->i_uid = cpu_to_le32(current->fsuid);
 549         if (dir->i_mode & S_ISGID) {
 550                 fe->i_gid = cpu_to_le32(dir->i_gid);
 551                 if (S_ISDIR(mode))
 552                         mode |= S_ISGID;
 553         } else
 554                 fe->i_gid = cpu_to_le32(current->fsgid);
 555         fe->i_mode = cpu_to_le16(mode);
 556         if (S_ISCHR(mode) || S_ISBLK(mode))
 557                 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
 558
 559         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 560
 561         fe->i_last_eb_blk = 0;
 562         strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
 563         le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
 564         fe->i_atime = fe->i_ctime = fe->i_mtime =
 565                 cpu_to_le64(CURRENT_TIME.tv_sec);
 566         fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
 567                 cpu_to_le32(CURRENT_TIME.tv_nsec);
 568         fe->i_dtime = 0;
 569
 570         fel = &fe->id2.i_list;
 571         fel->l_tree_depth = 0;
 572         fel->l_next_free_rec = 0;
 573         fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
 574
 575         status = ocfs2_journal_dirty(handle, *new_fe_bh);
 576         if (status < 0) {
 577                 mlog_errno(status);
 578                 goto leave;
 579         }
 580
 581         if (ocfs2_populate_inode(inode, fe, 1) < 0) {
 582                 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
 583                      "i_blkno=%llu, i_ino=%lu\n",
 584                      (unsigned long long) (*new_fe_bh)->b_blocknr,
 585                      (unsigned long long)fe->i_blkno, inode->i_ino);
 586                 BUG();
 587         }
 588
 589         ocfs2_inode_set_new(osb, inode);
 590         if (!ocfs2_mount_local(osb)) {
 591                 status = ocfs2_create_new_inode_locks(inode);
 592                 if (status < 0)
 593                         mlog_errno(status);
 594         }
 595
 596         status = 0; /* error in ocfs2_create_new_inode_locks is not
 597                      * critical */
 598
 599         *ret_inode = inode;
 600 leave:
 601         if (status < 0) {
 602                 if (*new_fe_bh) {
 603                         brelse(*new_fe_bh);
 604                         *new_fe_bh = NULL;
 605                 }
 606                 if (inode)
 607                         iput(inode);
 608         }
 609
 610         mlog_exit(status);
 611         return status;
 612 }
 613
 614 static int ocfs2_mkdir(struct inode *dir,
 615                        struct dentry *dentry,
 616                        int mode)
 617 {
 618         int ret;
 619
 620         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 621                    dentry->d_name.len, dentry->d_name.name);
 622         ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
 623         mlog_exit(ret);
 624
 625         return ret;
 626 }
 627
 628 static int ocfs2_create(struct inode *dir,
 629                         struct dentry *dentry,
 630                         int mode,
 631                         struct nameidata *nd)
 632 {
 633         int ret;
 634
 635         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 636                    dentry->d_name.len, dentry->d_name.name);
 637         ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
 638         mlog_exit(ret);
 639
 640         return ret;
 641 }
 642
 643 static int ocfs2_link(struct dentry *old_dentry,
 644                       struct inode *dir,
 645                       struct dentry *dentry)
 646 {
 647         handle_t *handle;
 648         struct inode *inode = old_dentry->d_inode;
 649         int err;
 650         struct buffer_head *fe_bh = NULL;
 651         struct buffer_head *parent_fe_bh = NULL;
 652         struct buffer_head *de_bh = NULL;
 653         struct ocfs2_dinode *fe = NULL;
 654         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 655
 656         mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
 657                    old_dentry->d_name.len, old_dentry->d_name.name,
 658                    dentry->d_name.len, dentry->d_name.name);
 659
 660         if (S_ISDIR(inode->i_mode))
 661                 return -EPERM;
 662
 663         err = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
 664         if (err < 0) {
 665                 if (err != -ENOENT)
 666                         mlog_errno(err);
 667                 return err;
 668         }
 669
 670         if (!dir->i_nlink) {
 671                 err = -ENOENT;
 672                 goto out;
 673         }
 674
 675         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 676                                         dentry->d_name.len);
 677         if (err)
 678                 goto out;
 679
 680         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 681                                            dentry->d_name.name,
 682                                            dentry->d_name.len, &de_bh);
 683         if (err < 0) {
 684                 mlog_errno(err);
 685                 goto out;
 686         }
 687
 688         err = ocfs2_meta_lock(inode, &fe_bh, 1);
 689         if (err < 0) {
 690                 if (err != -ENOENT)
 691                         mlog_errno(err);
 692                 goto out;
 693         }
 694
 695         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 696         if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
 697                 err = -EMLINK;
 698                 goto out_unlock_inode;
 699         }
 700
 701         handle = ocfs2_start_trans(osb, OCFS2_LINK_CREDITS);
 702         if (IS_ERR(handle)) {
 703                 err = PTR_ERR(handle);
 704                 handle = NULL;
 705                 mlog_errno(err);
 706                 goto out_unlock_inode;
 707         }
 708
 709         err = ocfs2_journal_access(handle, inode, fe_bh,
 710                                    OCFS2_JOURNAL_ACCESS_WRITE);
 711         if (err < 0) {
 712                 mlog_errno(err);
 713                 goto out_commit;
 714         }
 715
 716         inc_nlink(inode);
 717         inode->i_ctime = CURRENT_TIME;
 718         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 719         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 720         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 721
 722         err = ocfs2_journal_dirty(handle, fe_bh);
 723         if (err < 0) {
 724                 le16_add_cpu(&fe->i_links_count, -1);
 725                 drop_nlink(inode);
 726                 mlog_errno(err);
 727                 goto out_commit;
 728         }
 729
 730         err = ocfs2_add_entry(handle, dentry, inode,
 731                               OCFS2_I(inode)->ip_blkno,
 732                               parent_fe_bh, de_bh);
 733         if (err) {
 734                 le16_add_cpu(&fe->i_links_count, -1);
 735                 drop_nlink(inode);
 736                 mlog_errno(err);
 737                 goto out_commit;
 738         }
 739
 740         err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
 741         if (err) {
 742                 mlog_errno(err);
 743                 goto out_commit;
 744         }
 745
 746         atomic_inc(&inode->i_count);
 747         dentry->d_op = &ocfs2_dentry_ops;
 748         d_instantiate(dentry, inode);
 749
 750 out_commit:
 751         ocfs2_commit_trans(osb, handle);
 752 out_unlock_inode:
 753         ocfs2_meta_unlock(inode, 1);
 754
 755 out:
 756         ocfs2_meta_unlock(dir, 1);
 757
 758         if (de_bh)
 759                 brelse(de_bh);
 760         if (fe_bh)
 761                 brelse(fe_bh);
 762         if (parent_fe_bh)
 763                 brelse(parent_fe_bh);
 764
 765         mlog_exit(err);
 766
 767         return err;
 768 }
 769
 770 /*
 771  * Takes and drops an exclusive lock on the given dentry. This will
 772  * force other nodes to drop it.
 773  */
 774 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
 775 {
 776         int ret;
 777
 778         ret = ocfs2_dentry_lock(dentry, 1);
 779         if (ret)
 780                 mlog_errno(ret);
 781         else
 782                 ocfs2_dentry_unlock(dentry, 1);
 783
 784         return ret;
 785 }
 786
 787 static inline int inode_is_unlinkable(struct inode *inode)
 788 {
 789         if (S_ISDIR(inode->i_mode)) {
 790                 if (inode->i_nlink == 2)
 791                         return 1;
 792                 return 0;
 793         }
 794
 795         if (inode->i_nlink == 1)
 796                 return 1;
 797         return 0;
 798 }
 799
 800 static int ocfs2_unlink(struct inode *dir,
 801                         struct dentry *dentry)
 802 {
 803         int status;
 804         int child_locked = 0;
 805         struct inode *inode = dentry->d_inode;
 806         struct inode *orphan_dir = NULL;
 807         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 808         u64 blkno;
 809         struct ocfs2_dinode *fe = NULL;
 810         struct buffer_head *fe_bh = NULL;
 811         struct buffer_head *parent_node_bh = NULL;
 812         handle_t *handle = NULL;
 813         struct ocfs2_dir_entry *dirent = NULL;
 814         struct buffer_head *dirent_bh = NULL;
 815         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
 816         struct buffer_head *orphan_entry_bh = NULL;
 817
 818         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 819                    dentry->d_name.len, dentry->d_name.name);
 820
 821         BUG_ON(dentry->d_parent->d_inode != dir);
 822
 823         mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
 824
 825         if (inode == osb->root_inode) {
 826                 mlog(0, "Cannot delete the root directory\n");
 827                 return -EPERM;
 828         }
 829
 830         status = ocfs2_meta_lock(dir, &parent_node_bh, 1);
 831         if (status < 0) {
 832                 if (status != -ENOENT)
 833                         mlog_errno(status);
 834                 return status;
 835         }
 836
 837         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 838                                           dentry->d_name.len, &blkno,
 839                                           dir, &dirent_bh, &dirent);
 840         if (status < 0) {
 841                 if (status != -ENOENT)
 842                         mlog_errno(status);
 843                 goto leave;
 844         }
 845
 846         if (OCFS2_I(inode)->ip_blkno != blkno) {
 847                 status = -ENOENT;
 848
 849                 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
 850                      (unsigned long long)OCFS2_I(inode)->ip_blkno,
 851                      (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
 852                 goto leave;
 853         }
 854
 855         status = ocfs2_meta_lock(inode, &fe_bh, 1);
 856         if (status < 0) {
 857                 if (status != -ENOENT)
 858                         mlog_errno(status);
 859                 goto leave;
 860         }
 861         child_locked = 1;
 862
 863         if (S_ISDIR(inode->i_mode)) {
 864                 if (!ocfs2_empty_dir(inode)) {
 865                         status = -ENOTEMPTY;
 866                         goto leave;
 867                 } else if (inode->i_nlink != 2) {
 868                         status = -ENOTEMPTY;
 869                         goto leave;
 870                 }
 871         }
 872
 873         status = ocfs2_remote_dentry_delete(dentry);
 874         if (status < 0) {
 875                 /* This vote should succeed under all normal
 876                  * circumstances. */
 877                 mlog_errno(status);
 878                 goto leave;
 879         }
 880
 881         if (inode_is_unlinkable(inode)) {
 882                 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
 883                                                   orphan_name,
 884                                                   &orphan_entry_bh);
 885                 if (status < 0) {
 886                         mlog_errno(status);
 887                         goto leave;
 888                 }
 889         }
 890
 891         handle = ocfs2_start_trans(osb, OCFS2_UNLINK_CREDITS);
 892         if (IS_ERR(handle)) {
 893                 status = PTR_ERR(handle);
 894                 handle = NULL;
 895                 mlog_errno(status);
 896                 goto leave;
 897         }
 898
 899         status = ocfs2_journal_access(handle, inode, fe_bh,
 900                                       OCFS2_JOURNAL_ACCESS_WRITE);
 901         if (status < 0) {
 902                 mlog_errno(status);
 903                 goto leave;
 904         }
 905
 906         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 907
 908         if (inode_is_unlinkable(inode)) {
 909                 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
 910                                           orphan_entry_bh, orphan_dir);
 911                 if (status < 0) {
 912                         mlog_errno(status);
 913                         goto leave;
 914                 }
 915         }
 916
 917         /* delete the name from the parent dir */
 918         status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
 919         if (status < 0) {
 920                 mlog_errno(status);
 921                 goto leave;
 922         }
 923
 924         if (S_ISDIR(inode->i_mode))
 925                 drop_nlink(inode);
 926         drop_nlink(inode);
 927         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 928
 929         status = ocfs2_journal_dirty(handle, fe_bh);
 930         if (status < 0) {
 931                 mlog_errno(status);
 932                 goto leave;
 933         }
 934
 935         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 936         if (S_ISDIR(inode->i_mode))
 937                 drop_nlink(dir);
 938
 939         status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
 940         if (status < 0) {
 941                 mlog_errno(status);
 942                 if (S_ISDIR(inode->i_mode))
 943                         inc_nlink(dir);
 944         }
 945
 946 leave:
 947         if (handle)
 948                 ocfs2_commit_trans(osb, handle);
 949
 950         if (child_locked)
 951                 ocfs2_meta_unlock(inode, 1);
 952
 953         ocfs2_meta_unlock(dir, 1);
 954
 955         if (orphan_dir) {
 956                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
 957                 ocfs2_meta_unlock(orphan_dir, 1);
 958                 mutex_unlock(&orphan_dir->i_mutex);
 959                 iput(orphan_dir);
 960         }
 961
 962         if (fe_bh)
 963                 brelse(fe_bh);
 964
 965         if (dirent_bh)
 966                 brelse(dirent_bh);
 967
 968         if (parent_node_bh)
 969                 brelse(parent_node_bh);
 970
 971         if (orphan_entry_bh)
 972                 brelse(orphan_entry_bh);
 973
 974         mlog_exit(status);
 975
 976         return status;
 977 }
 978
 979 /*
 980  * The only place this should be used is rename!
 981  * if they have the same id, then the 1st one is the only one locked.
 982  */
 983 static int ocfs2_double_lock(struct ocfs2_super *osb,
 984                              struct buffer_head **bh1,
 985                              struct inode *inode1,
 986                              struct buffer_head **bh2,
 987                              struct inode *inode2)
 988 {
 989         int status;
 990         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
 991         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
 992         struct buffer_head **tmpbh;
 993         struct inode *tmpinode;
 994
 995         mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
 996                    (unsigned long long)oi1->ip_blkno,
 997                    (unsigned long long)oi2->ip_blkno);
 998
 999         if (*bh1)
1000                 *bh1 = NULL;
1001         if (*bh2)
1002                 *bh2 = NULL;
1003
1004         /* we always want to lock the one with the lower lockid first. */
1005         if (oi1->ip_blkno != oi2->ip_blkno) {
1006                 if (oi1->ip_blkno < oi2->ip_blkno) {
1007                         /* switch id1 and id2 around */
1008                         mlog(0, "switching them around...\n");
1009                         tmpbh = bh2;
1010                         bh2 = bh1;
1011                         bh1 = tmpbh;
1012
1013                         tmpinode = inode2;
1014                         inode2 = inode1;
1015                         inode1 = tmpinode;
1016                 }
1017                 /* lock id2 */
1018                 status = ocfs2_meta_lock(inode2, bh2, 1);
1019                 if (status < 0) {
1020                         if (status != -ENOENT)
1021                                 mlog_errno(status);
1022                         goto bail;
1023                 }
1024         }
1025
1026         /* lock id1 */
1027         status = ocfs2_meta_lock(inode1, bh1, 1);
1028         if (status < 0) {
1029                 /*
1030                  * An error return must mean that no cluster locks
1031                  * were held on function exit.
1032                  */
1033                 if (oi1->ip_blkno != oi2->ip_blkno)
1034                         ocfs2_meta_unlock(inode2, 1);
1035
1036                 if (status != -ENOENT)
1037                         mlog_errno(status);
1038         }
1039
1040 bail:
1041         mlog_exit(status);
1042         return status;
1043 }
1044
1045 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1046 {
1047         ocfs2_meta_unlock(inode1, 1);
1048
1049         if (inode1 != inode2)
1050                 ocfs2_meta_unlock(inode2, 1);
1051 }
1052
1053 #define PARENT_INO(buffer) \
1054         ((struct ocfs2_dir_entry *) \
1055          ((char *)buffer + \
1056           le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
1057
1058 static int ocfs2_rename(struct inode *old_dir,
1059                         struct dentry *old_dentry,
1060                         struct inode *new_dir,
1061                         struct dentry *new_dentry)
1062 {
1063         int status = 0, rename_lock = 0, parents_locked = 0;
1064         int old_child_locked = 0, new_child_locked = 0;
1065         struct inode *old_inode = old_dentry->d_inode;
1066         struct inode *new_inode = new_dentry->d_inode;
1067         struct inode *orphan_dir = NULL;
1068         struct ocfs2_dinode *newfe = NULL;
1069         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1070         struct buffer_head *orphan_entry_bh = NULL;
1071         struct buffer_head *newfe_bh = NULL;
1072         struct buffer_head *old_inode_bh = NULL;
1073         struct buffer_head *insert_entry_bh = NULL;
1074         struct ocfs2_super *osb = NULL;
1075         u64 newfe_blkno;
1076         handle_t *handle = NULL;
1077         struct buffer_head *old_dir_bh = NULL;
1078         struct buffer_head *new_dir_bh = NULL;
1079         struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry
1080                                                                // and new_dentry
1081         struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
1082         struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
1083                                                     // this is the 1st dirent bh
1084         nlink_t old_dir_nlink = old_dir->i_nlink;
1085
1086         /* At some point it might be nice to break this function up a
1087          * bit. */
1088
1089         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1090                    old_dir, old_dentry, new_dir, new_dentry,
1091                    old_dentry->d_name.len, old_dentry->d_name.name,
1092                    new_dentry->d_name.len, new_dentry->d_name.name);
1093
1094         osb = OCFS2_SB(old_dir->i_sb);
1095
1096         if (new_inode) {
1097                 if (!igrab(new_inode))
1098                         BUG();
1099         }
1100
1101         /* Assume a directory hierarchy thusly:
1102          * a/b/c
1103          * a/d
1104          * a,b,c, and d are all directories.
1105          *
1106          * from cwd of 'a' on both nodes:
1107          * node1: mv b/c d
1108          * node2: mv d   b/c
1109          *
1110          * And that's why, just like the VFS, we need a file system
1111          * rename lock. */
1112         if (old_dentry != new_dentry) {
1113                 status = ocfs2_rename_lock(osb);
1114                 if (status < 0) {
1115                         mlog_errno(status);
1116                         goto bail;
1117                 }
1118                 rename_lock = 1;
1119         }
1120
1121         /* if old and new are the same, this'll just do one lock. */
1122         status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1123                                    &new_dir_bh, new_dir);
1124         if (status < 0) {
1125                 mlog_errno(status);
1126                 goto bail;
1127         }
1128         parents_locked = 1;
1129
1130         /* make sure both dirs have bhs
1131          * get an extra ref on old_dir_bh if old==new */
1132         if (!new_dir_bh) {
1133                 if (old_dir_bh) {
1134                         new_dir_bh = old_dir_bh;
1135                         get_bh(new_dir_bh);
1136                 } else {
1137                         mlog(ML_ERROR, "no old_dir_bh!\n");
1138                         status = -EIO;
1139                         goto bail;
1140                 }
1141         }
1142
1143         /*
1144          * Aside from allowing a meta data update, the locking here
1145          * also ensures that the vote thread on other nodes won't have
1146          * to concurrently downconvert the inode and the dentry locks.
1147          */
1148         status = ocfs2_meta_lock(old_inode, &old_inode_bh, 1);
1149         if (status < 0) {
1150                 if (status != -ENOENT)
1151                         mlog_errno(status);
1152                 goto bail;
1153         }
1154         old_child_locked = 1;
1155
1156         status = ocfs2_remote_dentry_delete(old_dentry);
1157         if (status < 0) {
1158                 mlog_errno(status);
1159                 goto bail;
1160         }
1161
1162         if (S_ISDIR(old_inode->i_mode)) {
1163                 status = -EIO;
1164                 old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0);
1165                 if (!old_inode_de_bh)
1166                         goto bail;
1167
1168                 status = -EIO;
1169                 if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) !=
1170                     OCFS2_I(old_dir)->ip_blkno)
1171                         goto bail;
1172                 status = -EMLINK;
1173                 if (!new_inode && new_dir!=old_dir &&
1174                     new_dir->i_nlink >= OCFS2_LINK_MAX)
1175                         goto bail;
1176         }
1177
1178         status = -ENOENT;
1179         old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1180                                      old_dentry->d_name.len,
1181                                      old_dir, &old_de);
1182         if (!old_de_bh)
1183                 goto bail;
1184
1185         /*
1186          *  Check for inode number is _not_ due to possible IO errors.
1187          *  We might rmdir the source, keep it as pwd of some process
1188          *  and merrily kill the link to whatever was created under the
1189          *  same name. Goodbye sticky bit ;-<
1190          */
1191         if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno)
1192                 goto bail;
1193
1194         /* check if the target already exists (in which case we need
1195          * to delete it */
1196         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1197                                           new_dentry->d_name.len,
1198                                           &newfe_blkno, new_dir, &new_de_bh,
1199                                           &new_de);
1200         /* The only error we allow here is -ENOENT because the new
1201          * file not existing is perfectly valid. */
1202         if ((status < 0) && (status != -ENOENT)) {
1203                 /* If we cannot find the file specified we should just */
1204                 /* return the error... */
1205                 mlog_errno(status);
1206                 goto bail;
1207         }
1208
1209         if (!new_de && new_inode)
1210                 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1211                      "directory!", new_inode->i_ino);
1212
1213         /* In case we need to overwrite an existing file, we blow it
1214          * away first */
1215         if (new_de) {
1216                 /* VFS didn't think there existed an inode here, but
1217                  * someone else in the cluster must have raced our
1218                  * rename to create one. Today we error cleanly, in
1219                  * the future we should consider calling iget to build
1220                  * a new struct inode for this entry. */
1221                 if (!new_inode) {
1222                         status = -EACCES;
1223
1224                         mlog(0, "We found an inode for name %.*s but VFS "
1225                              "didn't give us one.\n", new_dentry->d_name.len,
1226                              new_dentry->d_name.name);
1227                         goto bail;
1228                 }
1229
1230                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1231                         status = -EACCES;
1232
1233                         mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1234                              (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1235                              (unsigned long long)newfe_blkno,
1236                              OCFS2_I(new_inode)->ip_flags);
1237                         goto bail;
1238                 }
1239
1240                 status = ocfs2_meta_lock(new_inode, &newfe_bh, 1);
1241                 if (status < 0) {
1242                         if (status != -ENOENT)
1243                                 mlog_errno(status);
1244                         goto bail;
1245                 }
1246                 new_child_locked = 1;
1247
1248                 status = ocfs2_remote_dentry_delete(new_dentry);
1249                 if (status < 0) {
1250                         mlog_errno(status);
1251                         goto bail;
1252                 }
1253
1254                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1255
1256                 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1257                      "newfebh=%p bhblocknr=%llu\n", new_de,
1258                      (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1259                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1260
1261                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1262                         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1263                                                           new_inode,
1264                                                           orphan_name,
1265                                                           &orphan_entry_bh);
1266                         if (status < 0) {
1267                                 mlog_errno(status);
1268                                 goto bail;
1269                         }
1270                 }
1271         } else {
1272                 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1273
1274                 status = ocfs2_check_dir_for_entry(new_dir,
1275                                                    new_dentry->d_name.name,
1276                                                    new_dentry->d_name.len);
1277                 if (status)
1278                         goto bail;
1279
1280                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1281                                                       new_dentry->d_name.name,
1282                                                       new_dentry->d_name.len,
1283                                                       &insert_entry_bh);
1284                 if (status < 0) {
1285                         mlog_errno(status);
1286                         goto bail;
1287                 }
1288         }
1289
1290         handle = ocfs2_start_trans(osb, OCFS2_RENAME_CREDITS);
1291         if (IS_ERR(handle)) {
1292                 status = PTR_ERR(handle);
1293                 handle = NULL;
1294                 mlog_errno(status);
1295                 goto bail;
1296         }
1297
1298         if (new_de) {
1299                 if (S_ISDIR(new_inode->i_mode)) {
1300                         if (!ocfs2_empty_dir(new_inode) ||
1301                             new_inode->i_nlink != 2) {
1302                                 status = -ENOTEMPTY;
1303                                 goto bail;
1304                         }
1305                 }
1306                 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1307                                               OCFS2_JOURNAL_ACCESS_WRITE);
1308                 if (status < 0) {
1309                         mlog_errno(status);
1310                         goto bail;
1311                 }
1312
1313                 if (S_ISDIR(new_inode->i_mode) ||
1314                     (newfe->i_links_count == cpu_to_le16(1))){
1315                         status = ocfs2_orphan_add(osb, handle, new_inode,
1316                                                   newfe, orphan_name,
1317                                                   orphan_entry_bh, orphan_dir);
1318                         if (status < 0) {
1319                                 mlog_errno(status);
1320                                 goto bail;
1321                         }
1322                 }
1323
1324                 /* change the dirent to point to the correct inode */
1325                 status = ocfs2_journal_access(handle, new_dir, new_de_bh,
1326                                               OCFS2_JOURNAL_ACCESS_WRITE);
1327                 if (status < 0) {
1328                         mlog_errno(status);
1329                         goto bail;
1330                 }
1331                 new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno);
1332                 new_de->file_type = old_de->file_type;
1333                 new_dir->i_version++;
1334                 status = ocfs2_journal_dirty(handle, new_de_bh);
1335                 if (status < 0) {
1336                         mlog_errno(status);
1337                         goto bail;
1338                 }
1339
1340                 if (S_ISDIR(new_inode->i_mode))
1341                         newfe->i_links_count = 0;
1342                 else
1343                         le16_add_cpu(&newfe->i_links_count, -1);
1344
1345                 status = ocfs2_journal_dirty(handle, newfe_bh);
1346                 if (status < 0) {
1347                         mlog_errno(status);
1348                         goto bail;
1349                 }
1350         } else {
1351                 /* if the name was not found in new_dir, add it now */
1352                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1353                                          OCFS2_I(old_inode)->ip_blkno,
1354                                          new_dir_bh, insert_entry_bh);
1355         }
1356
1357         old_inode->i_ctime = CURRENT_TIME;
1358         mark_inode_dirty(old_inode);
1359         ocfs2_mark_inode_dirty(handle, old_inode, old_inode_bh);
1360
1361         /* now that the name has been added to new_dir, remove the old name */
1362         status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1363         if (status < 0) {
1364                 mlog_errno(status);
1365                 goto bail;
1366         }
1367
1368         if (new_inode) {
1369                 new_inode->i_nlink--;
1370                 new_inode->i_ctime = CURRENT_TIME;
1371         }
1372         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1373         if (old_inode_de_bh) {
1374                 status = ocfs2_journal_access(handle, old_inode,
1375                                              old_inode_de_bh,
1376                                              OCFS2_JOURNAL_ACCESS_WRITE);
1377                 PARENT_INO(old_inode_de_bh->b_data) =
1378                         cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
1379                 status = ocfs2_journal_dirty(handle, old_inode_de_bh);
1380                 old_dir->i_nlink--;
1381                 if (new_inode) {
1382                         new_inode->i_nlink--;
1383                 } else {
1384                         inc_nlink(new_dir);
1385                         mark_inode_dirty(new_dir);
1386                 }
1387         }
1388         mark_inode_dirty(old_dir);
1389         ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1390         if (new_inode) {
1391                 mark_inode_dirty(new_inode);
1392                 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1393         }
1394
1395         if (old_dir != new_dir) {
1396                 /* Keep the same times on both directories.*/
1397                 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1398
1399                 /*
1400                  * This will also pick up the i_nlink change from the
1401                  * block above.
1402                  */
1403                 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1404         }
1405
1406         if (old_dir_nlink != old_dir->i_nlink) {
1407                 if (!old_dir_bh) {
1408                         mlog(ML_ERROR, "need to change nlink for old dir "
1409                              "%llu from %d to %d but bh is NULL!\n",
1410                              (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1411                              (int)old_dir_nlink, old_dir->i_nlink);
1412                 } else {
1413                         struct ocfs2_dinode *fe;
1414                         status = ocfs2_journal_access(handle, old_dir,
1415                                                       old_dir_bh,
1416                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1417                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1418                         fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1419                         status = ocfs2_journal_dirty(handle, old_dir_bh);
1420                 }
1421         }
1422
1423         ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1424         status = 0;
1425 bail:
1426         if (rename_lock)
1427                 ocfs2_rename_unlock(osb);
1428
1429         if (handle)
1430                 ocfs2_commit_trans(osb, handle);
1431
1432         if (parents_locked)
1433                 ocfs2_double_unlock(old_dir, new_dir);
1434
1435         if (old_child_locked)
1436                 ocfs2_meta_unlock(old_inode, 1);
1437
1438         if (new_child_locked)
1439                 ocfs2_meta_unlock(new_inode, 1);
1440
1441         if (orphan_dir) {
1442                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1443                 ocfs2_meta_unlock(orphan_dir, 1);
1444                 mutex_unlock(&orphan_dir->i_mutex);
1445                 iput(orphan_dir);
1446         }
1447
1448         if (new_inode)
1449                 sync_mapping_buffers(old_inode->i_mapping);
1450
1451         if (new_inode)
1452                 iput(new_inode);
1453         if (newfe_bh)
1454                 brelse(newfe_bh);
1455         if (old_inode_bh)
1456                 brelse(old_inode_bh);
1457         if (old_dir_bh)
1458                 brelse(old_dir_bh);
1459         if (new_dir_bh)
1460                 brelse(new_dir_bh);
1461         if (new_de_bh)
1462                 brelse(new_de_bh);
1463         if (old_de_bh)
1464                 brelse(old_de_bh);
1465         if (old_inode_de_bh)
1466                 brelse(old_inode_de_bh);
1467         if (orphan_entry_bh)
1468                 brelse(orphan_entry_bh);
1469         if (insert_entry_bh)
1470                 brelse(insert_entry_bh);
1471
1472         mlog_exit(status);
1473
1474         return status;
1475 }
1476
1477 /*
1478  * we expect i_size = strlen(symname). Copy symname into the file
1479  * data, including the null terminator.
1480  */
1481 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1482                                      handle_t *handle,
1483                                      struct inode *inode,
1484                                      const char *symname)
1485 {
1486         struct buffer_head **bhs = NULL;
1487         const char *c;
1488         struct super_block *sb = osb->sb;
1489         u64 p_blkno;
1490         int p_blocks;
1491         int virtual, blocks, status, i, bytes_left;
1492
1493         bytes_left = i_size_read(inode) + 1;
1494         /* we can't trust i_blocks because we're actually going to
1495          * write i_size + 1 bytes. */
1496         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1497
1498         mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1499                         (unsigned long long)inode->i_blocks,
1500                         i_size_read(inode), blocks);
1501
1502         /* Sanity check -- make sure we're going to fit. */
1503         if (bytes_left >
1504             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1505                 status = -EIO;
1506                 mlog_errno(status);
1507                 goto bail;
1508         }
1509
1510         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1511         if (!bhs) {
1512                 status = -ENOMEM;
1513                 mlog_errno(status);
1514                 goto bail;
1515         }
1516
1517         status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno,
1518                                              &p_blocks);
1519         if (status < 0) {
1520                 mlog_errno(status);
1521                 goto bail;
1522         }
1523
1524         /* links can never be larger than one cluster so we know this
1525          * is all going to be contiguous, but do a sanity check
1526          * anyway. */
1527         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1528                 status = -EIO;
1529                 mlog_errno(status);
1530                 goto bail;
1531         }
1532
1533         virtual = 0;
1534         while(bytes_left > 0) {
1535                 c = &symname[virtual * sb->s_blocksize];
1536
1537                 bhs[virtual] = sb_getblk(sb, p_blkno);
1538                 if (!bhs[virtual]) {
1539                         status = -ENOMEM;
1540                         mlog_errno(status);
1541                         goto bail;
1542                 }
1543                 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1544
1545                 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1546                                               OCFS2_JOURNAL_ACCESS_CREATE);
1547                 if (status < 0) {
1548                         mlog_errno(status);
1549                         goto bail;
1550                 }
1551
1552                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1553
1554                 memcpy(bhs[virtual]->b_data, c,
1555                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1556                        bytes_left);
1557
1558                 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1559                 if (status < 0) {
1560                         mlog_errno(status);
1561                         goto bail;
1562                 }
1563
1564                 virtual++;
1565                 p_blkno++;
1566                 bytes_left -= sb->s_blocksize;
1567         }
1568
1569         status = 0;
1570 bail:
1571
1572         if (bhs) {
1573                 for(i = 0; i < blocks; i++)
1574                         if (bhs[i])
1575                                 brelse(bhs[i]);
1576                 kfree(bhs);
1577         }
1578
1579         mlog_exit(status);
1580         return status;
1581 }
1582
1583 static int ocfs2_symlink(struct inode *dir,
1584                          struct dentry *dentry,
1585                          const char *symname)
1586 {
1587         int status, l, credits;
1588         u64 newsize;
1589         struct ocfs2_super *osb = NULL;
1590         struct inode *inode = NULL;
1591         struct super_block *sb;
1592         struct buffer_head *new_fe_bh = NULL;
1593         struct buffer_head *de_bh = NULL;
1594         struct buffer_head *parent_fe_bh = NULL;
1595         struct ocfs2_dinode *fe = NULL;
1596         struct ocfs2_dinode *dirfe;
1597         handle_t *handle = NULL;
1598         struct ocfs2_alloc_context *inode_ac = NULL;
1599         struct ocfs2_alloc_context *data_ac = NULL;
1600
1601         mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1602                    dentry, symname, dentry->d_name.len, dentry->d_name.name);
1603
1604         sb = dir->i_sb;
1605         osb = OCFS2_SB(sb);
1606
1607         l = strlen(symname) + 1;
1608
1609         credits = ocfs2_calc_symlink_credits(sb);
1610
1611         /* lock the parent directory */
1612         status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
1613         if (status < 0) {
1614                 if (status != -ENOENT)
1615                         mlog_errno(status);
1616                 return status;
1617         }
1618
1619         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1620         if (!dirfe->i_links_count) {
1621                 /* can't make a file in a deleted directory. */
1622                 status = -ENOENT;
1623                 goto bail;
1624         }
1625
1626         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1627                                            dentry->d_name.len);
1628         if (status)
1629                 goto bail;
1630
1631         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1632                                               dentry->d_name.name,
1633                                               dentry->d_name.len, &de_bh);
1634         if (status < 0) {
1635                 mlog_errno(status);
1636                 goto bail;
1637         }
1638
1639         status = ocfs2_reserve_new_inode(osb, &inode_ac);
1640         if (status < 0) {
1641                 if (status != -ENOSPC)
1642                         mlog_errno(status);
1643                 goto bail;
1644         }
1645
1646         /* don't reserve bitmap space for fast symlinks. */
1647         if (l > ocfs2_fast_symlink_chars(sb)) {
1648                 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
1649                 if (status < 0) {
1650                         if (status != -ENOSPC)
1651                                 mlog_errno(status);
1652                         goto bail;
1653                 }
1654         }
1655
1656         handle = ocfs2_start_trans(osb, credits);
1657         if (IS_ERR(handle)) {
1658                 status = PTR_ERR(handle);
1659                 handle = NULL;
1660                 mlog_errno(status);
1661                 goto bail;
1662         }
1663
1664         status = ocfs2_mknod_locked(osb, dir, dentry,
1665                                     S_IFLNK | S_IRWXUGO, 0,
1666                                     &new_fe_bh, parent_fe_bh, handle,
1667                                     &inode, inode_ac);
1668         if (status < 0) {
1669                 mlog_errno(status);
1670                 goto bail;
1671         }
1672
1673         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1674         inode->i_rdev = 0;
1675         newsize = l - 1;
1676         if (l > ocfs2_fast_symlink_chars(sb)) {
1677                 inode->i_op = &ocfs2_symlink_inode_operations;
1678                 status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh,
1679                                                     handle, data_ac, NULL,
1680                                                     NULL);
1681                 if (status < 0) {
1682                         if (status != -ENOSPC && status != -EINTR) {
1683                                 mlog(ML_ERROR,
1684                                      "Failed to extend file to %llu\n",
1685                                      (unsigned long long)newsize);
1686                                 mlog_errno(status);
1687                                 status = -ENOSPC;
1688                         }
1689                         goto bail;
1690                 }
1691                 i_size_write(inode, newsize);
1692                 inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize);
1693         } else {
1694                 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1695                 memcpy((char *) fe->id2.i_symlink, symname, l);
1696                 i_size_write(inode, newsize);
1697                 inode->i_blocks = 0;
1698         }
1699
1700         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1701         if (status < 0) {
1702                 mlog_errno(status);
1703                 goto bail;
1704         }
1705
1706         if (!ocfs2_inode_is_fast_symlink(inode)) {
1707                 status = ocfs2_create_symlink_data(osb, handle, inode,
1708                                                    symname);
1709                 if (status < 0) {
1710                         mlog_errno(status);
1711                         goto bail;
1712                 }
1713         }
1714
1715         status = ocfs2_add_entry(handle, dentry, inode,
1716                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
1717                                  de_bh);
1718         if (status < 0) {
1719                 mlog_errno(status);
1720                 goto bail;
1721         }
1722
1723         status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1724         if (status) {
1725                 mlog_errno(status);
1726                 goto bail;
1727         }
1728
1729         insert_inode_hash(inode);
1730         dentry->d_op = &ocfs2_dentry_ops;
1731         d_instantiate(dentry, inode);
1732 bail:
1733         if (handle)
1734                 ocfs2_commit_trans(osb, handle);
1735
1736         ocfs2_meta_unlock(dir, 1);
1737
1738         if (new_fe_bh)
1739                 brelse(new_fe_bh);
1740         if (parent_fe_bh)
1741                 brelse(parent_fe_bh);
1742         if (de_bh)
1743                 brelse(de_bh);
1744         if (inode_ac)
1745                 ocfs2_free_alloc_context(inode_ac);
1746         if (data_ac)
1747                 ocfs2_free_alloc_context(data_ac);
1748         if ((status < 0) && inode)
1749                 iput(inode);
1750
1751         mlog_exit(status);
1752
1753         return status;
1754 }
1755
1756 int ocfs2_check_dir_entry(struct inode * dir,
1757                           struct ocfs2_dir_entry * de,
1758                           struct buffer_head * bh,
1759                           unsigned long offset)
1760 {
1761         const char *error_msg = NULL;
1762         const int rlen = le16_to_cpu(de->rec_len);
1763
1764         if (rlen < OCFS2_DIR_REC_LEN(1))
1765                 error_msg = "rec_len is smaller than minimal";
1766         else if (rlen % 4 != 0)
1767                 error_msg = "rec_len % 4 != 0";
1768         else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
1769                 error_msg = "rec_len is too small for name_len";
1770         else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
1771                 error_msg = "directory entry across blocks";
1772
1773         if (error_msg != NULL)
1774                 mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
1775                      "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
1776                      (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
1777                      offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
1778                      de->name_len);
1779         return error_msg == NULL ? 1 : 0;
1780 }
1781
1782 /* we don't always have a dentry for what we want to add, so people
1783  * like orphan dir can call this instead.
1784  *
1785  * If you pass me insert_bh, I'll skip the search of the other dir
1786  * blocks and put the record in there.
1787  */
1788 static int __ocfs2_add_entry(handle_t *handle,
1789                              struct inode *dir,
1790                              const char *name, int namelen,
1791                              struct inode *inode, u64 blkno,
1792                              struct buffer_head *parent_fe_bh,
1793                              struct buffer_head *insert_bh)
1794 {
1795         unsigned long offset;
1796         unsigned short rec_len;
1797         struct ocfs2_dir_entry *de, *de1;
1798         struct super_block *sb;
1799         int retval, status;
1800
1801         mlog_entry_void();
1802
1803         sb = dir->i_sb;
1804
1805         if (!namelen)
1806                 return -EINVAL;
1807
1808         rec_len = OCFS2_DIR_REC_LEN(namelen);
1809         offset = 0;
1810         de = (struct ocfs2_dir_entry *) insert_bh->b_data;
1811         while (1) {
1812                 BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data);
1813                 /* These checks should've already been passed by the
1814                  * prepare function, but I guess we can leave them
1815                  * here anyway. */
1816                 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
1817                         retval = -ENOENT;
1818                         goto bail;
1819                 }
1820                 if (ocfs2_match(namelen, name, de)) {
1821                         retval = -EEXIST;
1822                         goto bail;
1823                 }
1824                 if (((le64_to_cpu(de->inode) == 0) &&
1825                      (le16_to_cpu(de->rec_len) >= rec_len)) ||
1826                     (le16_to_cpu(de->rec_len) >=
1827                      (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
1828                         dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1829                         retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
1830                         if (retval < 0) {
1831                                 mlog_errno(retval);
1832                                 goto bail;
1833                         }
1834
1835                         status = ocfs2_journal_access(handle, dir, insert_bh,
1836                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1837                         /* By now the buffer is marked for journaling */
1838                         offset += le16_to_cpu(de->rec_len);
1839                         if (le64_to_cpu(de->inode)) {
1840                                 de1 = (struct ocfs2_dir_entry *)((char *) de +
1841                                         OCFS2_DIR_REC_LEN(de->name_len));
1842                                 de1->rec_len =
1843                                         cpu_to_le16(le16_to_cpu(de->rec_len) -
1844                                         OCFS2_DIR_REC_LEN(de->name_len));
1845                                 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1846                                 de = de1;
1847                         }
1848                         de->file_type = OCFS2_FT_UNKNOWN;
1849                         if (blkno) {
1850                                 de->inode = cpu_to_le64(blkno);
1851                                 ocfs2_set_de_type(de, inode->i_mode);
1852                         } else
1853                                 de->inode = 0;
1854                         de->name_len = namelen;
1855                         memcpy(de->name, name, namelen);
1856
1857                         dir->i_version++;
1858                         status = ocfs2_journal_dirty(handle, insert_bh);
1859                         retval = 0;
1860                         goto bail;
1861                 }
1862                 offset += le16_to_cpu(de->rec_len);
1863                 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
1864         }
1865
1866         /* when you think about it, the assert above should prevent us
1867          * from ever getting here. */
1868         retval = -ENOSPC;
1869 bail:
1870
1871         mlog_exit(retval);
1872         return retval;
1873 }
1874
1875
1876 /*
1877  * ocfs2_delete_entry deletes a directory entry by merging it with the
1878  * previous entry
1879  */
1880 static int ocfs2_delete_entry(handle_t *handle,
1881                               struct inode *dir,
1882                               struct ocfs2_dir_entry *de_del,
1883                               struct buffer_head *bh)
1884 {
1885         struct ocfs2_dir_entry *de, *pde;
1886         int i, status = -ENOENT;
1887
1888         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
1889
1890         i = 0;
1891         pde = NULL;
1892         de = (struct ocfs2_dir_entry *) bh->b_data;
1893         while (i < bh->b_size) {
1894                 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
1895                         status = -EIO;
1896                         mlog_errno(status);
1897                         goto bail;
1898                 }
1899                 if (de == de_del)  {
1900                         status = ocfs2_journal_access(handle, dir, bh,
1901                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1902                         if (status < 0) {
1903                                 status = -EIO;
1904                                 mlog_errno(status);
1905                                 goto bail;
1906                         }
1907                         if (pde)
1908                                 pde->rec_len =
1909                                         cpu_to_le16(le16_to_cpu(pde->rec_len) +
1910                                                     le16_to_cpu(de->rec_len));
1911                         else
1912                                 de->inode = 0;
1913                         dir->i_version++;
1914                         status = ocfs2_journal_dirty(handle, bh);
1915                         goto bail;
1916                 }
1917                 i += le16_to_cpu(de->rec_len);
1918                 pde = de;
1919                 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
1920         }
1921 bail:
1922         mlog_exit(status);
1923         return status;
1924 }
1925
1926 /*
1927  * Returns 0 if not found, -1 on failure, and 1 on success
1928  */
1929 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
1930                                         struct inode *dir,
1931                                         const char *name, int namelen,
1932                                         unsigned long offset,
1933                                         struct ocfs2_dir_entry **res_dir)
1934 {
1935         struct ocfs2_dir_entry *de;
1936         char *dlimit, *de_buf;
1937         int de_len;
1938         int ret = 0;
1939
1940         mlog_entry_void();
1941
1942         de_buf = bh->b_data;
1943         dlimit = de_buf + dir->i_sb->s_blocksize;
1944
1945         while (de_buf < dlimit) {
1946                 /* this code is executed quadratically often */
1947                 /* do minimal checking `by hand' */
1948
1949                 de = (struct ocfs2_dir_entry *) de_buf;
1950
1951                 if (de_buf + namelen <= dlimit &&
1952                     ocfs2_match(namelen, name, de)) {
1953                         /* found a match - just to be sure, do a full check */
1954                         if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
1955                                 ret = -1;
1956                                 goto bail;
1957                         }
1958                         *res_dir = de;
1959                         ret = 1;
1960                         goto bail;
1961                 }
1962
1963                 /* prevent looping on a bad block */
1964                 de_len = le16_to_cpu(de->rec_len);
1965                 if (de_len <= 0) {
1966                         ret = -1;
1967                         goto bail;
1968                 }
1969
1970                 de_buf += de_len;
1971                 offset += de_len;
1972         }
1973
1974 bail:
1975         mlog_exit(ret);
1976         return ret;
1977 }
1978
1979 struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
1980                                      struct inode *dir,
1981                                      struct ocfs2_dir_entry **res_dir)
1982 {
1983         struct super_block *sb;
1984         struct buffer_head *bh_use[NAMEI_RA_SIZE];
1985         struct buffer_head *bh, *ret = NULL;
1986         unsigned long start, block, b;
1987         int ra_max = 0;         /* Number of bh's in the readahead
1988                                    buffer, bh_use[] */
1989         int ra_ptr = 0;         /* Current index into readahead
1990                                    buffer */
1991         int num = 0;
1992         int nblocks, i, err;
1993
1994         mlog_entry_void();
1995
1996         *res_dir = NULL;
1997         sb = dir->i_sb;
1998
1999         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2000         start = OCFS2_I(dir)->ip_dir_start_lookup;
2001         if (start >= nblocks)
2002                 start = 0;
2003         block = start;
2004
2005 restart:
2006         do {
2007                 /*
2008                  * We deal with the read-ahead logic here.
2009                  */
2010                 if (ra_ptr >= ra_max) {
2011                         /* Refill the readahead buffer */
2012                         ra_ptr = 0;
2013                         b = block;
2014                         for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
2015                                 /*
2016                                  * Terminate if we reach the end of the
2017                                  * directory and must wrap, or if our
2018                                  * search has finished at this block.
2019                                  */
2020                                 if (b >= nblocks || (num && block == start)) {
2021                                         bh_use[ra_max] = NULL;
2022                                         break;
2023                                 }
2024                                 num++;
2025
2026                                 bh = ocfs2_bread(dir, b++, &err, 1);
2027                                 bh_use[ra_max] = bh;
2028                         }
2029                 }
2030                 if ((bh = bh_use[ra_ptr++]) == NULL)
2031                         goto next;
2032                 wait_on_buffer(bh);
2033                 if (!buffer_uptodate(bh)) {
2034                         /* read error, skip block & hope for the best */
2035                         ocfs2_error(dir->i_sb, "reading directory %llu, "
2036                                     "offset %lu\n",
2037                                     (unsigned long long)OCFS2_I(dir)->ip_blkno,
2038                                     block);
2039                         brelse(bh);
2040                         goto next;
2041                 }
2042                 i = ocfs2_search_dirblock(bh, dir, name, namelen,
2043                                           block << sb->s_blocksize_bits,
2044                                           res_dir);
2045                 if (i == 1) {
2046                         OCFS2_I(dir)->ip_dir_start_lookup = block;
2047                         ret = bh;
2048                         goto cleanup_and_exit;
2049                 } else {
2050                         brelse(bh);
2051                         if (i < 0)
2052                                 goto cleanup_and_exit;
2053                 }
2054         next:
2055                 if (++block >= nblocks)
2056                         block = 0;
2057         } while (block != start);
2058
2059         /*
2060          * If the directory has grown while we were searching, then
2061          * search the last part of the directory before giving up.
2062          */
2063         block = nblocks;
2064         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2065         if (block < nblocks) {
2066                 start = 0;
2067                 goto restart;
2068         }
2069
2070 cleanup_and_exit:
2071         /* Clean up the read-ahead blocks */
2072         for (; ra_ptr < ra_max; ra_ptr++)
2073                 brelse(bh_use[ra_ptr]);
2074
2075         mlog_exit_ptr(ret);
2076         return ret;
2077 }
2078
2079 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2080 {
2081         int status, namelen;
2082
2083         mlog_entry_void();
2084
2085         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
2086                            (long long)blkno);
2087         if (namelen <= 0) {
2088                 if (namelen)
2089                         status = namelen;
2090                 else
2091                         status = -EINVAL;
2092                 mlog_errno(status);
2093                 goto bail;
2094         }
2095         if (namelen != OCFS2_ORPHAN_NAMELEN) {
2096                 status = -EINVAL;
2097                 mlog_errno(status);
2098                 goto bail;
2099         }
2100
2101         mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
2102              namelen);
2103
2104         status = 0;
2105 bail:
2106         mlog_exit(status);
2107         return status;
2108 }
2109
2110 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2111                                     struct inode **ret_orphan_dir,
2112                                     struct inode *inode,
2113                                     char *name,
2114                                     struct buffer_head **de_bh)
2115 {
2116         struct inode *orphan_dir_inode;
2117         struct buffer_head *orphan_dir_bh = NULL;
2118         int status = 0;
2119
2120         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2121         if (status < 0) {
2122                 mlog_errno(status);
2123                 return status;
2124         }
2125
2126         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2127                                                        ORPHAN_DIR_SYSTEM_INODE,
2128                                                        osb->slot_num);
2129         if (!orphan_dir_inode) {
2130                 status = -ENOENT;
2131                 mlog_errno(status);
2132                 return status;
2133         }
2134
2135         mutex_lock(&orphan_dir_inode->i_mutex);
2136
2137         status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2138         if (status < 0) {
2139                 mlog_errno(status);
2140                 goto leave;
2141         }
2142
2143         status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2144                                               orphan_dir_bh, name,
2145                                               OCFS2_ORPHAN_NAMELEN, de_bh);
2146         if (status < 0) {
2147                 ocfs2_meta_unlock(orphan_dir_inode, 1);
2148
2149                 mlog_errno(status);
2150                 goto leave;
2151         }
2152
2153         *ret_orphan_dir = orphan_dir_inode;
2154
2155 leave:
2156         if (status) {
2157                 mutex_unlock(&orphan_dir_inode->i_mutex);
2158                 iput(orphan_dir_inode);
2159         }
2160
2161         if (orphan_dir_bh)
2162                 brelse(orphan_dir_bh);
2163
2164         mlog_exit(status);
2165         return status;
2166 }
2167
2168 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2169                             handle_t *handle,
2170                             struct inode *inode,
2171                             struct ocfs2_dinode *fe,
2172                             char *name,
2173                             struct buffer_head *de_bh,
2174                             struct inode *orphan_dir_inode)
2175 {
2176         struct buffer_head *orphan_dir_bh = NULL;
2177         int status = 0;
2178         struct ocfs2_dinode *orphan_fe;
2179
2180         mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
2181
2182         status = ocfs2_read_block(osb,
2183                                   OCFS2_I(orphan_dir_inode)->ip_blkno,
2184                                   &orphan_dir_bh, OCFS2_BH_CACHED,
2185                                   orphan_dir_inode);
2186         if (status < 0) {
2187                 mlog_errno(status);
2188                 goto leave;
2189         }
2190
2191         status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
2192                                       OCFS2_JOURNAL_ACCESS_WRITE);
2193         if (status < 0) {
2194                 mlog_errno(status);
2195                 goto leave;
2196         }
2197
2198         /* we're a cluster, and nlink can change on disk from
2199          * underneath us... */
2200         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2201         if (S_ISDIR(inode->i_mode))
2202                 le16_add_cpu(&orphan_fe->i_links_count, 1);
2203         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2204
2205         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2206         if (status < 0) {
2207                 mlog_errno(status);
2208                 goto leave;
2209         }
2210
2211         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2212                                    OCFS2_ORPHAN_NAMELEN, inode,
2213                                    OCFS2_I(inode)->ip_blkno,
2214                                    orphan_dir_bh, de_bh);
2215         if (status < 0) {
2216                 mlog_errno(status);
2217                 goto leave;
2218         }
2219
2220         le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2221
2222         /* Record which orphan dir our inode now resides
2223          * in. delete_inode will use this to determine which orphan
2224          * dir to lock. */
2225         spin_lock(&OCFS2_I(inode)->ip_lock);
2226         OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num;
2227         spin_unlock(&OCFS2_I(inode)->ip_lock);
2228
2229         mlog(0, "Inode %llu orphaned in slot %d\n",
2230              (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
2231
2232 leave:
2233         if (orphan_dir_bh)
2234                 brelse(orphan_dir_bh);
2235
2236         mlog_exit(status);
2237         return status;
2238 }
2239
2240 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2241 int ocfs2_orphan_del(struct ocfs2_super *osb,
2242                      handle_t *handle,
2243                      struct inode *orphan_dir_inode,
2244                      struct inode *inode,
2245                      struct buffer_head *orphan_dir_bh)
2246 {
2247         char name[OCFS2_ORPHAN_NAMELEN + 1];
2248         struct ocfs2_dinode *orphan_fe;
2249         int status = 0;
2250         struct buffer_head *target_de_bh = NULL;
2251         struct ocfs2_dir_entry *target_de = NULL;
2252
2253         mlog_entry_void();
2254
2255         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2256         if (status < 0) {
2257                 mlog_errno(status);
2258                 goto leave;
2259         }
2260
2261         mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
2262              name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2263              OCFS2_ORPHAN_NAMELEN);
2264
2265         /* find it's spot in the orphan directory */
2266         target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
2267                                         orphan_dir_inode, &target_de);
2268         if (!target_de_bh) {
2269                 status = -ENOENT;
2270                 mlog_errno(status);
2271                 goto leave;
2272         }
2273
2274         /* remove it from the orphan directory */
2275         status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
2276                                     target_de_bh);
2277         if (status < 0) {
2278                 mlog_errno(status);
2279                 goto leave;
2280         }
2281
2282         status = ocfs2_journal_access(handle,orphan_dir_inode,  orphan_dir_bh,
2283                                       OCFS2_JOURNAL_ACCESS_WRITE);
2284         if (status < 0) {
2285                 mlog_errno(status);
2286                 goto leave;
2287         }
2288
2289         /* do the i_nlink dance! :) */
2290         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2291         if (S_ISDIR(inode->i_mode))
2292                 le16_add_cpu(&orphan_fe->i_links_count, -1);
2293         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2294
2295         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2296         if (status < 0) {
2297                 mlog_errno(status);
2298                 goto leave;
2299         }
2300
2301 leave:
2302         if (target_de_bh)
2303                 brelse(target_de_bh);
2304
2305         mlog_exit(status);
2306         return status;
2307 }
2308
2309 const struct inode_operations ocfs2_dir_iops = {
2310         .create         = ocfs2_create,
2311         .lookup         = ocfs2_lookup,
2312         .link           = ocfs2_link,
2313         .unlink         = ocfs2_unlink,
2314         .rmdir          = ocfs2_unlink,
2315         .symlink        = ocfs2_symlink,
2316         .mkdir          = ocfs2_mkdir,
2317         .mknod          = ocfs2_mknod,
2318         .rename         = ocfs2_rename,
2319         .setattr        = ocfs2_setattr,
2320         .getattr        = ocfs2_getattr,
2321         .permission     = ocfs2_permission,
2322 };