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 "symlink.h"
  60 #include "sysfile.h"
  61 #include "uptodate.h"
  62 #include "vote.h"
  63
  64 #include "buffer_head_io.h"
  65
  66 #define NAMEI_RA_CHUNKS  2
  67 #define NAMEI_RA_BLOCKS  4
  68 #define NAMEI_RA_SIZE        (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
  69 #define NAMEI_RA_INDEX(c,b)  (((c) * NAMEI_RA_BLOCKS) + (b))
  70
  71 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
  72                                         struct inode *dir,
  73                                         const char *name, int namelen,
  74                                         unsigned long offset,
  75                                         struct ocfs2_dir_entry **res_dir);
  76
  77 static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle,
  78                               struct inode *dir,
  79                               struct ocfs2_dir_entry *de_del,
  80                               struct buffer_head *bh);
  81
  82 static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle,
  83                              struct inode *dir,
  84                              const char *name, int namelen,
  85                              struct inode *inode, u64 blkno,
  86                              struct buffer_head *parent_fe_bh,
  87                              struct buffer_head *insert_bh);
  88
  89 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
  90                               struct inode *dir,
  91                               struct dentry *dentry, int mode,
  92                               dev_t dev,
  93                               struct buffer_head **new_fe_bh,
  94                               struct buffer_head *parent_fe_bh,
  95                               struct ocfs2_journal_handle *handle,
  96                               struct inode **ret_inode,
  97                               struct ocfs2_alloc_context *inode_ac);
  98
  99 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
 100                               struct ocfs2_journal_handle *handle,
 101                               struct inode *parent,
 102                               struct inode *inode,
 103                               struct buffer_head *fe_bh,
 104                               struct ocfs2_alloc_context *data_ac);
 105
 106 static int ocfs2_double_lock(struct ocfs2_super *osb,
 107                              struct ocfs2_journal_handle *handle,
 108                              struct buffer_head **bh1,
 109                              struct inode *inode1,
 110                              struct buffer_head **bh2,
 111                              struct inode *inode2);
 112
 113 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
 114                                     struct ocfs2_journal_handle *handle,
 115                                     struct inode *inode,
 116                                     char *name,
 117                                     struct buffer_head **de_bh);
 118
 119 static int ocfs2_orphan_add(struct ocfs2_super *osb,
 120                             struct ocfs2_journal_handle *handle,
 121                             struct inode *inode,
 122                             struct ocfs2_dinode *fe,
 123                             char *name,
 124                             struct buffer_head *de_bh);
 125
 126 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
 127                                      struct ocfs2_journal_handle *handle,
 128                                      struct inode *inode,
 129                                      const char *symname);
 130
 131 static inline int ocfs2_add_entry(struct ocfs2_journal_handle *handle,
 132                                   struct dentry *dentry,
 133                                   struct inode *inode, u64 blkno,
 134                                   struct buffer_head *parent_fe_bh,
 135                                   struct buffer_head *insert_bh)
 136 {
 137         return __ocfs2_add_entry(handle, dentry->d_parent->d_inode,
 138                                  dentry->d_name.name, dentry->d_name.len,
 139                                  inode, blkno, parent_fe_bh, insert_bh);
 140 }
 141
 142 /* An orphan dir name is an 8 byte value, printed as a hex string */
 143 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
 144
 145 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
 146                                    struct nameidata *nd)
 147 {
 148         int status;
 149         u64 blkno;
 150         struct buffer_head *dirent_bh = NULL;
 151         struct inode *inode = NULL;
 152         struct dentry *ret;
 153         struct ocfs2_dir_entry *dirent;
 154         struct ocfs2_inode_info *oi;
 155
 156         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 157                    dentry->d_name.len, dentry->d_name.name);
 158
 159         if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
 160                 ret = ERR_PTR(-ENAMETOOLONG);
 161                 goto bail;
 162         }
 163
 164         mlog(0, "find name %.*s in directory %"MLFu64"\n", dentry->d_name.len,
 165              dentry->d_name.name, OCFS2_I(dir)->ip_blkno);
 166
 167         status = ocfs2_meta_lock(dir, NULL, NULL, 0);
 168         if (status < 0) {
 169                 if (status != -ENOENT)
 170                         mlog_errno(status);
 171                 ret = ERR_PTR(status);
 172                 goto bail;
 173         }
 174
 175         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 176                                           dentry->d_name.len, &blkno,
 177                                           dir, &dirent_bh, &dirent);
 178         if (status < 0)
 179                 goto bail_add;
 180
 181         inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno);
 182         if (IS_ERR(inode)) {
 183                 mlog(ML_ERROR, "Unable to create inode %"MLFu64"\n", blkno);
 184                 ret = ERR_PTR(-EACCES);
 185                 goto bail_unlock;
 186         }
 187
 188         oi = OCFS2_I(inode);
 189         /* Clear any orphaned state... If we were able to look up the
 190          * inode from a directory, it certainly can't be orphaned. We
 191          * might have the bad state from a node which intended to
 192          * orphan this inode but crashed before it could commit the
 193          * unlink. */
 194         spin_lock(&oi->ip_lock);
 195         oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
 196         oi->ip_orphaned_slot = OCFS2_INVALID_SLOT;
 197         spin_unlock(&oi->ip_lock);
 198
 199 bail_add:
 200
 201         dentry->d_op = &ocfs2_dentry_ops;
 202         ret = d_splice_alias(inode, dentry);
 203
 204 bail_unlock:
 205         /* Don't drop the cluster lock until *after* the d_add --
 206          * unlink on another node will message us to remove that
 207          * dentry under this lock so otherwise we can race this with
 208          * the vote thread and have a stale dentry. */
 209         ocfs2_meta_unlock(dir, 0);
 210
 211 bail:
 212         if (dirent_bh)
 213                 brelse(dirent_bh);
 214
 215         mlog_exit_ptr(ret);
 216
 217         return ret;
 218 }
 219
 220 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
 221                               struct ocfs2_journal_handle *handle,
 222                               struct inode *parent,
 223                               struct inode *inode,
 224                               struct buffer_head *fe_bh,
 225                               struct ocfs2_alloc_context *data_ac)
 226 {
 227         int status;
 228         struct buffer_head *new_bh = NULL;
 229         struct ocfs2_dir_entry *de = NULL;
 230
 231         mlog_entry_void();
 232
 233         status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
 234                                      data_ac, NULL, &new_bh);
 235         if (status < 0) {
 236                 mlog_errno(status);
 237                 goto bail;
 238         }
 239
 240         ocfs2_set_new_buffer_uptodate(inode, new_bh);
 241
 242         status = ocfs2_journal_access(handle, inode, new_bh,
 243                                       OCFS2_JOURNAL_ACCESS_CREATE);
 244         if (status < 0) {
 245                 mlog_errno(status);
 246                 goto bail;
 247         }
 248         memset(new_bh->b_data, 0, osb->sb->s_blocksize);
 249
 250         de = (struct ocfs2_dir_entry *) new_bh->b_data;
 251         de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
 252         de->name_len = 1;
 253         de->rec_len =
 254                 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
 255         strcpy(de->name, ".");
 256         ocfs2_set_de_type(de, S_IFDIR);
 257         de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
 258         de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
 259         de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize -
 260                                   OCFS2_DIR_REC_LEN(1));
 261         de->name_len = 2;
 262         strcpy(de->name, "..");
 263         ocfs2_set_de_type(de, S_IFDIR);
 264
 265         status = ocfs2_journal_dirty(handle, new_bh);
 266         if (status < 0) {
 267                 mlog_errno(status);
 268                 goto bail;
 269         }
 270
 271         i_size_write(inode, inode->i_sb->s_blocksize);
 272         inode->i_nlink = 2;
 273         inode->i_blocks = ocfs2_align_bytes_to_sectors(inode->i_sb->s_blocksize);
 274         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 275         if (status < 0) {
 276                 mlog_errno(status);
 277                 goto bail;
 278         }
 279
 280         status = 0;
 281 bail:
 282         if (new_bh)
 283                 brelse(new_bh);
 284
 285         mlog_exit(status);
 286         return status;
 287 }
 288
 289 static int ocfs2_mknod(struct inode *dir,
 290                        struct dentry *dentry,
 291                        int mode,
 292                        dev_t dev)
 293 {
 294         int status = 0;
 295         struct buffer_head *parent_fe_bh = NULL;
 296         struct ocfs2_journal_handle *handle = NULL;
 297         struct ocfs2_super *osb;
 298         struct ocfs2_dinode *dirfe;
 299         struct buffer_head *new_fe_bh = NULL;
 300         struct buffer_head *de_bh = NULL;
 301         struct inode *inode = NULL;
 302         struct ocfs2_alloc_context *inode_ac = NULL;
 303         struct ocfs2_alloc_context *data_ac = NULL;
 304
 305         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 306                    (unsigned long)dev, dentry->d_name.len,
 307                    dentry->d_name.name);
 308
 309         /* get our super block */
 310         osb = OCFS2_SB(dir->i_sb);
 311
 312         if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
 313                 mlog(ML_ERROR, "inode %"MLFu64" has i_nlink of %u\n",
 314                      OCFS2_I(dir)->ip_blkno, dir->i_nlink);
 315                 status = -EMLINK;
 316                 goto leave;
 317         }
 318
 319         handle = ocfs2_alloc_handle(osb);
 320         if (handle == NULL) {
 321                 status = -ENOMEM;
 322                 mlog_errno(status);
 323                 goto leave;
 324         }
 325
 326         status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
 327         if (status < 0) {
 328                 if (status != -ENOENT)
 329                         mlog_errno(status);
 330                 goto leave;
 331         }
 332
 333         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
 334         if (!dirfe->i_links_count) {
 335                 /* can't make a file in a deleted directory. */
 336                 status = -ENOENT;
 337                 goto leave;
 338         }
 339
 340         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 341                                            dentry->d_name.len);
 342         if (status)
 343                 goto leave;
 344
 345         /* get a spot inside the dir. */
 346         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 347                                               dentry->d_name.name,
 348                                               dentry->d_name.len, &de_bh);
 349         if (status < 0) {
 350                 mlog_errno(status);
 351                 goto leave;
 352         }
 353
 354         /* reserve an inode spot */
 355         status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
 356         if (status < 0) {
 357                 if (status != -ENOSPC)
 358                         mlog_errno(status);
 359                 goto leave;
 360         }
 361
 362         /* are we making a directory? If so, reserve a cluster for his
 363          * 1st extent. */
 364         if (S_ISDIR(mode)) {
 365                 status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
 366                 if (status < 0) {
 367                         if (status != -ENOSPC)
 368                                 mlog_errno(status);
 369                         goto leave;
 370                 }
 371         }
 372
 373         handle = ocfs2_start_trans(osb, handle, OCFS2_MKNOD_CREDITS);
 374         if (IS_ERR(handle)) {
 375                 status = PTR_ERR(handle);
 376                 handle = NULL;
 377                 mlog_errno(status);
 378                 goto leave;
 379         }
 380
 381         /* do the real work now. */
 382         status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
 383                                     &new_fe_bh, parent_fe_bh, handle,
 384                                     &inode, inode_ac);
 385         if (status < 0) {
 386                 mlog_errno(status);
 387                 goto leave;
 388         }
 389
 390         if (S_ISDIR(mode)) {
 391                 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
 392                                             new_fe_bh, data_ac);
 393                 if (status < 0) {
 394                         mlog_errno(status);
 395                         goto leave;
 396                 }
 397
 398                 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
 399                                               OCFS2_JOURNAL_ACCESS_WRITE);
 400                 if (status < 0) {
 401                         mlog_errno(status);
 402                         goto leave;
 403                 }
 404                 le16_add_cpu(&dirfe->i_links_count, 1);
 405                 status = ocfs2_journal_dirty(handle, parent_fe_bh);
 406                 if (status < 0) {
 407                         mlog_errno(status);
 408                         goto leave;
 409                 }
 410                 dir->i_nlink++;
 411         }
 412
 413         status = ocfs2_add_entry(handle, dentry, inode,
 414                                  OCFS2_I(inode)->ip_blkno, parent_fe_bh,
 415                                  de_bh);
 416         if (status < 0) {
 417                 mlog_errno(status);
 418                 goto leave;
 419         }
 420
 421         insert_inode_hash(inode);
 422         dentry->d_op = &ocfs2_dentry_ops;
 423         d_instantiate(dentry, inode);
 424         status = 0;
 425 leave:
 426         if (handle)
 427                 ocfs2_commit_trans(handle);
 428
 429         if (status == -ENOSPC)
 430                 mlog(0, "Disk is full\n");
 431
 432         if (new_fe_bh)
 433                 brelse(new_fe_bh);
 434
 435         if (de_bh)
 436                 brelse(de_bh);
 437
 438         if (parent_fe_bh)
 439                 brelse(parent_fe_bh);
 440
 441         if ((status < 0) && inode)
 442                 iput(inode);
 443
 444         if (inode_ac)
 445                 ocfs2_free_alloc_context(inode_ac);
 446
 447         if (data_ac)
 448                 ocfs2_free_alloc_context(data_ac);
 449
 450         mlog_exit(status);
 451
 452         return status;
 453 }
 454
 455 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 456                               struct inode *dir,
 457                               struct dentry *dentry, int mode,
 458                               dev_t dev,
 459                               struct buffer_head **new_fe_bh,
 460                               struct buffer_head *parent_fe_bh,
 461                               struct ocfs2_journal_handle *handle,
 462                               struct inode **ret_inode,
 463                               struct ocfs2_alloc_context *inode_ac)
 464 {
 465         int status = 0;
 466         struct ocfs2_dinode *fe = NULL;
 467         struct ocfs2_extent_list *fel;
 468         u64 fe_blkno = 0;
 469         u16 suballoc_bit;
 470         struct inode *inode = NULL;
 471
 472         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 473                    (unsigned long)dev, dentry->d_name.len,
 474                    dentry->d_name.name);
 475
 476         *new_fe_bh = NULL;
 477         *ret_inode = NULL;
 478
 479         status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
 480                                        &fe_blkno);
 481         if (status < 0) {
 482                 mlog_errno(status);
 483                 goto leave;
 484         }
 485
 486         inode = new_inode(dir->i_sb);
 487         if (IS_ERR(inode)) {
 488                 status = PTR_ERR(inode);
 489                 mlog(ML_ERROR, "new_inode failed!\n");
 490                 goto leave;
 491         }
 492
 493         /* populate as many fields early on as possible - many of
 494          * these are used by the support functions here and in
 495          * callers. */
 496         inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
 497         OCFS2_I(inode)->ip_blkno = fe_blkno;
 498         if (S_ISDIR(mode))
 499                 inode->i_nlink = 2;
 500         else
 501                 inode->i_nlink = 1;
 502         inode->i_mode = mode;
 503         spin_lock(&osb->osb_lock);
 504         inode->i_generation = osb->s_next_generation++;
 505         spin_unlock(&osb->osb_lock);
 506
 507         *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
 508         if (!*new_fe_bh) {
 509                 status = -EIO;
 510                 mlog_errno(status);
 511                 goto leave;
 512         }
 513         ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
 514
 515         status = ocfs2_journal_access(handle, inode, *new_fe_bh,
 516                                       OCFS2_JOURNAL_ACCESS_CREATE);
 517         if (status < 0) {
 518                 mlog_errno(status);
 519                 goto leave;
 520         }
 521
 522         fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
 523         memset(fe, 0, osb->sb->s_blocksize);
 524
 525         fe->i_generation = cpu_to_le32(inode->i_generation);
 526         fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
 527         fe->i_blkno = cpu_to_le64(fe_blkno);
 528         fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
 529         fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
 530         fe->i_uid = cpu_to_le32(current->fsuid);
 531         if (dir->i_mode & S_ISGID) {
 532                 fe->i_gid = cpu_to_le32(dir->i_gid);
 533                 if (S_ISDIR(mode))
 534                         mode |= S_ISGID;
 535         } else
 536                 fe->i_gid = cpu_to_le32(current->fsgid);
 537         fe->i_mode = cpu_to_le16(mode);
 538         if (S_ISCHR(mode) || S_ISBLK(mode))
 539                 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
 540
 541         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 542
 543         fe->i_last_eb_blk = 0;
 544         strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
 545         le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
 546         fe->i_atime = fe->i_ctime = fe->i_mtime =
 547                 cpu_to_le64(CURRENT_TIME.tv_sec);
 548         fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
 549                 cpu_to_le32(CURRENT_TIME.tv_nsec);
 550         fe->i_dtime = 0;
 551
 552         fel = &fe->id2.i_list;
 553         fel->l_tree_depth = 0;
 554         fel->l_next_free_rec = 0;
 555         fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
 556
 557         status = ocfs2_journal_dirty(handle, *new_fe_bh);
 558         if (status < 0) {
 559                 mlog_errno(status);
 560                 goto leave;
 561         }
 562
 563         if (ocfs2_populate_inode(inode, fe, 1) < 0) {
 564                 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
 565                      "i_blkno=%"MLFu64", i_ino=%lu\n",
 566                      (unsigned long long) (*new_fe_bh)->b_blocknr,
 567                      fe->i_blkno, inode->i_ino);
 568                 BUG();
 569         }
 570
 571         ocfs2_inode_set_new(osb, inode);
 572         status = ocfs2_create_new_inode_locks(inode);
 573         if (status < 0)
 574                 mlog_errno(status);
 575
 576         status = 0; /* error in ocfs2_create_new_inode_locks is not
 577                      * critical */
 578
 579         *ret_inode = inode;
 580 leave:
 581         if (status < 0) {
 582                 if (*new_fe_bh) {
 583                         brelse(*new_fe_bh);
 584                         *new_fe_bh = NULL;
 585                 }
 586                 if (inode)
 587                         iput(inode);
 588         }
 589
 590         mlog_exit(status);
 591         return status;
 592 }
 593
 594 static int ocfs2_mkdir(struct inode *dir,
 595                        struct dentry *dentry,
 596                        int mode)
 597 {
 598         int ret;
 599
 600         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 601                    dentry->d_name.len, dentry->d_name.name);
 602         ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
 603         mlog_exit(ret);
 604
 605         return ret;
 606 }
 607
 608 static int ocfs2_create(struct inode *dir,
 609                         struct dentry *dentry,
 610                         int mode,
 611                         struct nameidata *nd)
 612 {
 613         int ret;
 614
 615         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 616                    dentry->d_name.len, dentry->d_name.name);
 617         ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
 618         mlog_exit(ret);
 619
 620         return ret;
 621 }
 622
 623 static int ocfs2_link(struct dentry *old_dentry,
 624                       struct inode *dir,
 625                       struct dentry *dentry)
 626 {
 627         struct ocfs2_journal_handle *handle = NULL;
 628         struct inode *inode = old_dentry->d_inode;
 629         int err;
 630         struct buffer_head *fe_bh = NULL;
 631         struct buffer_head *parent_fe_bh = NULL;
 632         struct buffer_head *de_bh = NULL;
 633         struct ocfs2_dinode *fe = NULL;
 634         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 635
 636         mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
 637                    old_dentry->d_name.len, old_dentry->d_name.name,
 638                    dentry->d_name.len, dentry->d_name.name);
 639
 640         if (S_ISDIR(inode->i_mode)) {
 641                 err = -EPERM;
 642                 goto bail;
 643         }
 644
 645         if (inode->i_nlink >= OCFS2_LINK_MAX) {
 646                 err = -EMLINK;
 647                 goto bail;
 648         }
 649
 650         handle = ocfs2_alloc_handle(osb);
 651         if (handle == NULL) {
 652                 err = -ENOMEM;
 653                 goto bail;
 654         }
 655
 656         err = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
 657         if (err < 0) {
 658                 if (err != -ENOENT)
 659                         mlog_errno(err);
 660                 goto bail;
 661         }
 662
 663         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 664                                         dentry->d_name.len);
 665         if (err)
 666                 goto bail;
 667
 668         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 669                                            dentry->d_name.name,
 670                                            dentry->d_name.len, &de_bh);
 671         if (err < 0) {
 672                 mlog_errno(err);
 673                 goto bail;
 674         }
 675
 676         err = ocfs2_meta_lock(inode, handle, &fe_bh, 1);
 677         if (err < 0) {
 678                 if (err != -ENOENT)
 679                         mlog_errno(err);
 680                 goto bail;
 681         }
 682
 683         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 684         if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
 685                 err = -EMLINK;
 686                 goto bail;
 687         }
 688
 689         handle = ocfs2_start_trans(osb, handle, OCFS2_LINK_CREDITS);
 690         if (IS_ERR(handle)) {
 691                 err = PTR_ERR(handle);
 692                 handle = NULL;
 693                 mlog_errno(err);
 694                 goto bail;
 695         }
 696
 697         err = ocfs2_journal_access(handle, inode, fe_bh,
 698                                    OCFS2_JOURNAL_ACCESS_WRITE);
 699         if (err < 0) {
 700                 mlog_errno(err);
 701                 goto bail;
 702         }
 703
 704         inode->i_nlink++;
 705         inode->i_ctime = CURRENT_TIME;
 706         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 707         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 708         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 709
 710         err = ocfs2_journal_dirty(handle, fe_bh);
 711         if (err < 0) {
 712                 le16_add_cpu(&fe->i_links_count, -1);
 713                 inode->i_nlink--;
 714                 mlog_errno(err);
 715                 goto bail;
 716         }
 717
 718         err = ocfs2_add_entry(handle, dentry, inode,
 719                               OCFS2_I(inode)->ip_blkno,
 720                               parent_fe_bh, de_bh);
 721         if (err) {
 722                 le16_add_cpu(&fe->i_links_count, -1);
 723                 inode->i_nlink--;
 724                 mlog_errno(err);
 725                 goto bail;
 726         }
 727
 728         atomic_inc(&inode->i_count);
 729         dentry->d_op = &ocfs2_dentry_ops;
 730         d_instantiate(dentry, inode);
 731 bail:
 732         if (handle)
 733                 ocfs2_commit_trans(handle);
 734         if (de_bh)
 735                 brelse(de_bh);
 736         if (fe_bh)
 737                 brelse(fe_bh);
 738         if (parent_fe_bh)
 739                 brelse(parent_fe_bh);
 740
 741         mlog_exit(err);
 742
 743         return err;
 744 }
 745
 746 static int ocfs2_unlink(struct inode *dir,
 747                         struct dentry *dentry)
 748 {
 749         int status;
 750         unsigned int saved_nlink = 0;
 751         struct inode *inode = dentry->d_inode;
 752         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 753         u64 blkno;
 754         struct ocfs2_dinode *fe = NULL;
 755         struct buffer_head *fe_bh = NULL;
 756         struct buffer_head *parent_node_bh = NULL;
 757         struct ocfs2_journal_handle *handle = NULL;
 758         struct ocfs2_dir_entry *dirent = NULL;
 759         struct buffer_head *dirent_bh = NULL;
 760         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
 761         struct buffer_head *orphan_entry_bh = NULL;
 762
 763         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 764                    dentry->d_name.len, dentry->d_name.name);
 765
 766         BUG_ON(dentry->d_parent->d_inode != dir);
 767
 768         mlog(0, "ino = %"MLFu64"\n", OCFS2_I(inode)->ip_blkno);
 769
 770         if (inode == osb->root_inode) {
 771                 mlog(0, "Cannot delete the root directory\n");
 772                 status = -EPERM;
 773                 goto leave;
 774         }
 775
 776         handle = ocfs2_alloc_handle(osb);
 777         if (handle == NULL) {
 778                 status = -ENOMEM;
 779                 mlog_errno(status);
 780                 goto leave;
 781         }
 782
 783         status = ocfs2_meta_lock(dir, handle, &parent_node_bh, 1);
 784         if (status < 0) {
 785                 if (status != -ENOENT)
 786                         mlog_errno(status);
 787                 goto leave;
 788         }
 789
 790         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 791                                           dentry->d_name.len, &blkno,
 792                                           dir, &dirent_bh, &dirent);
 793         if (status < 0) {
 794                 if (status != -ENOENT)
 795                         mlog_errno(status);
 796                 goto leave;
 797         }
 798
 799         if (OCFS2_I(inode)->ip_blkno != blkno) {
 800                 status = -ENOENT;
 801
 802                 mlog(0, "ip_blkno (%"MLFu64") != dirent blkno (%"MLFu64") "
 803                      "ip_flags = %x\n", OCFS2_I(inode)->ip_blkno, blkno,
 804                      OCFS2_I(inode)->ip_flags);
 805                 goto leave;
 806         }
 807
 808         status = ocfs2_meta_lock(inode, handle, &fe_bh, 1);
 809         if (status < 0) {
 810                 if (status != -ENOENT)
 811                         mlog_errno(status);
 812                 goto leave;
 813         }
 814
 815         if (S_ISDIR(inode->i_mode)) {
 816                 if (!ocfs2_empty_dir(inode)) {
 817                         status = -ENOTEMPTY;
 818                         goto leave;
 819                 } else if (inode->i_nlink != 2) {
 820                         status = -ENOTEMPTY;
 821                         goto leave;
 822                 }
 823         }
 824
 825         /* There are still a few steps left until we can consider the
 826          * unlink to have succeeded. Save off nlink here before
 827          * modification so we can set it back in case we hit an issue
 828          * before commit. */
 829         saved_nlink = inode->i_nlink;
 830         if (S_ISDIR(inode->i_mode))
 831                 inode->i_nlink = 0;
 832         else
 833                 inode->i_nlink--;
 834
 835         status = ocfs2_request_unlink_vote(inode, dentry,
 836                                            (unsigned int) inode->i_nlink);
 837         if (status < 0) {
 838                 /* This vote should succeed under all normal
 839                  * circumstances. */
 840                 mlog_errno(status);
 841                 goto leave;
 842         }
 843
 844         if (!inode->i_nlink) {
 845                 status = ocfs2_prepare_orphan_dir(osb, handle, inode,
 846                                                   orphan_name,
 847                                                   &orphan_entry_bh);
 848                 if (status < 0) {
 849                         mlog_errno(status);
 850                         goto leave;
 851                 }
 852         }
 853
 854         handle = ocfs2_start_trans(osb, handle, OCFS2_UNLINK_CREDITS);
 855         if (IS_ERR(handle)) {
 856                 status = PTR_ERR(handle);
 857                 handle = NULL;
 858                 mlog_errno(status);
 859                 goto leave;
 860         }
 861
 862         status = ocfs2_journal_access(handle, inode, fe_bh,
 863                                       OCFS2_JOURNAL_ACCESS_WRITE);
 864         if (status < 0) {
 865                 mlog_errno(status);
 866                 goto leave;
 867         }
 868
 869         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 870
 871         if (!inode->i_nlink) {
 872                 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
 873                                           orphan_entry_bh);
 874                 if (status < 0) {
 875                         mlog_errno(status);
 876                         goto leave;
 877                 }
 878         }
 879
 880         /* delete the name from the parent dir */
 881         status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
 882         if (status < 0) {
 883                 mlog_errno(status);
 884                 goto leave;
 885         }
 886
 887         /* We can set nlink on the dinode now. clear the saved version
 888          * so that it doesn't get set later. */
 889         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 890         saved_nlink = 0;
 891
 892         status = ocfs2_journal_dirty(handle, fe_bh);
 893         if (status < 0) {
 894                 mlog_errno(status);
 895                 goto leave;
 896         }
 897
 898         if (S_ISDIR(inode->i_mode)) {
 899                 dir->i_nlink--;
 900                 status = ocfs2_mark_inode_dirty(handle, dir,
 901                                                 parent_node_bh);
 902                 if (status < 0) {
 903                         mlog_errno(status);
 904                         dir->i_nlink++;
 905                 }
 906         }
 907
 908 leave:
 909         if (status < 0 && saved_nlink)
 910                 inode->i_nlink = saved_nlink;
 911
 912         if (handle)
 913                 ocfs2_commit_trans(handle);
 914
 915         if (fe_bh)
 916                 brelse(fe_bh);
 917
 918         if (dirent_bh)
 919                 brelse(dirent_bh);
 920
 921         if (parent_node_bh)
 922                 brelse(parent_node_bh);
 923
 924         if (orphan_entry_bh)
 925                 brelse(orphan_entry_bh);
 926
 927         mlog_exit(status);
 928
 929         return status;
 930 }
 931
 932 /*
 933  * The only place this should be used is rename!
 934  * if they have the same id, then the 1st one is the only one locked.
 935  */
 936 static int ocfs2_double_lock(struct ocfs2_super *osb,
 937                              struct ocfs2_journal_handle *handle,
 938                              struct buffer_head **bh1,
 939                              struct inode *inode1,
 940                              struct buffer_head **bh2,
 941                              struct inode *inode2)
 942 {
 943         int status;
 944         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
 945         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
 946         struct buffer_head **tmpbh;
 947         struct inode *tmpinode;
 948
 949         mlog_entry("(inode1 = %"MLFu64", inode2 = %"MLFu64")\n",
 950                    oi1->ip_blkno, oi2->ip_blkno);
 951
 952         BUG_ON(!handle);
 953
 954         if (*bh1)
 955                 *bh1 = NULL;
 956         if (*bh2)
 957                 *bh2 = NULL;
 958
 959         /* we always want to lock the one with the lower lockid first. */
 960         if (oi1->ip_blkno != oi2->ip_blkno) {
 961                 if (oi1->ip_blkno < oi2->ip_blkno) {
 962                         /* switch id1 and id2 around */
 963                         mlog(0, "switching them around...\n");
 964                         tmpbh = bh2;
 965                         bh2 = bh1;
 966                         bh1 = tmpbh;
 967
 968                         tmpinode = inode2;
 969                         inode2 = inode1;
 970                         inode1 = tmpinode;
 971                 }
 972                 /* lock id2 */
 973                 status = ocfs2_meta_lock(inode2, handle, bh2, 1);
 974                 if (status < 0) {
 975                         if (status != -ENOENT)
 976                                 mlog_errno(status);
 977                         goto bail;
 978                 }
 979         }
 980         /* lock id1 */
 981         status = ocfs2_meta_lock(inode1, handle, bh1, 1);
 982         if (status < 0) {
 983                 if (status != -ENOENT)
 984                         mlog_errno(status);
 985                 goto bail;
 986         }
 987 bail:
 988         mlog_exit(status);
 989         return status;
 990 }
 991
 992 #define PARENT_INO(buffer) \
 993         ((struct ocfs2_dir_entry *) \
 994          ((char *)buffer + \
 995           le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
 996
 997 static int ocfs2_rename(struct inode *old_dir,
 998                         struct dentry *old_dentry,
 999                         struct inode *new_dir,
1000                         struct dentry *new_dentry)
1001 {
1002         int status = 0, rename_lock = 0;
1003         struct inode *old_inode = old_dentry->d_inode;
1004         struct inode *new_inode = new_dentry->d_inode;
1005         struct ocfs2_dinode *newfe = NULL;
1006         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1007         struct buffer_head *orphan_entry_bh = NULL;
1008         struct buffer_head *newfe_bh = NULL;
1009         struct buffer_head *insert_entry_bh = NULL;
1010         struct ocfs2_super *osb = NULL;
1011         u64 newfe_blkno;
1012         struct ocfs2_journal_handle *handle = NULL;
1013         struct buffer_head *old_dir_bh = NULL;
1014         struct buffer_head *new_dir_bh = NULL;
1015         struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry
1016                                                                // and new_dentry
1017         struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
1018         struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
1019                                                     // this is the 1st dirent bh
1020         nlink_t old_dir_nlink = old_dir->i_nlink, new_dir_nlink = new_dir->i_nlink;
1021         unsigned int links_count;
1022
1023         /* At some point it might be nice to break this function up a
1024          * bit. */
1025
1026         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1027                    old_dir, old_dentry, new_dir, new_dentry,
1028                    old_dentry->d_name.len, old_dentry->d_name.name,
1029                    new_dentry->d_name.len, new_dentry->d_name.name);
1030
1031         osb = OCFS2_SB(old_dir->i_sb);
1032
1033         if (new_inode) {
1034                 if (!igrab(new_inode))
1035                         BUG();
1036         }
1037
1038         if (atomic_read(&old_dentry->d_count) > 2) {
1039                 shrink_dcache_parent(old_dentry);
1040                 if (atomic_read(&old_dentry->d_count) > 2) {
1041                         status = -EBUSY;
1042                         goto bail;
1043                 }
1044         }
1045
1046         /* Assume a directory heirarchy thusly:
1047          * a/b/c
1048          * a/d
1049          * a,b,c, and d are all directories.
1050          *
1051          * from cwd of 'a' on both nodes:
1052          * node1: mv b/c d
1053          * node2: mv d   b/c
1054          *
1055          * And that's why, just like the VFS, we need a file system
1056          * rename lock. */
1057         if (old_dentry != new_dentry) {
1058                 status = ocfs2_rename_lock(osb);
1059                 if (status < 0) {
1060                         mlog_errno(status);
1061                         goto bail;
1062                 }
1063                 rename_lock = 1;
1064         }
1065
1066         handle = ocfs2_alloc_handle(osb);
1067         if (handle == NULL) {
1068                 status = -ENOMEM;
1069                 mlog_errno(status);
1070                 goto bail;
1071         }
1072
1073         /* if old and new are the same, this'll just do one lock. */
1074         status = ocfs2_double_lock(osb, handle,
1075                                   &old_dir_bh, old_dir,
1076                                   &new_dir_bh, new_dir);
1077         if (status < 0) {
1078                 mlog_errno(status);
1079                 goto bail;
1080         }
1081
1082         /* make sure both dirs have bhs
1083          * get an extra ref on old_dir_bh if old==new */
1084         if (!new_dir_bh) {
1085                 if (old_dir_bh) {
1086                         new_dir_bh = old_dir_bh;
1087                         get_bh(new_dir_bh);
1088                 } else {
1089                         mlog(ML_ERROR, "no old_dir_bh!\n");
1090                         status = -EIO;
1091                         goto bail;
1092                 }
1093         }
1094
1095         if (S_ISDIR(old_inode->i_mode)) {
1096                 /* Directories actually require metadata updates to
1097                  * the directory info so we can't get away with not
1098                  * doing node locking on it. */
1099                 status = ocfs2_meta_lock(old_inode, handle, NULL, 1);
1100                 if (status < 0) {
1101                         if (status != -ENOENT)
1102                                 mlog_errno(status);
1103                         goto bail;
1104                 }
1105
1106                 status = ocfs2_request_rename_vote(old_inode, old_dentry);
1107                 if (status < 0) {
1108                         mlog_errno(status);
1109                         goto bail;
1110                 }
1111
1112                 status = -EIO;
1113                 old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0);
1114                 if (!old_inode_de_bh)
1115                         goto bail;
1116
1117                 status = -EIO;
1118                 if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) !=
1119                     OCFS2_I(old_dir)->ip_blkno)
1120                         goto bail;
1121                 status = -EMLINK;
1122                 if (!new_inode && new_dir!=old_dir &&
1123                     new_dir->i_nlink >= OCFS2_LINK_MAX)
1124                         goto bail;
1125         } else {
1126                 /* Ah, the simple case - we're a file so just send a
1127                  * message. */
1128                 status = ocfs2_request_rename_vote(old_inode, old_dentry);
1129                 if (status < 0) {
1130                         mlog_errno(status);
1131                         goto bail;
1132                 }
1133         }
1134
1135         status = -ENOENT;
1136         old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1137                                      old_dentry->d_name.len,
1138                                      old_dir, &old_de);
1139         if (!old_de_bh)
1140                 goto bail;
1141
1142         /*
1143          *  Check for inode number is _not_ due to possible IO errors.
1144          *  We might rmdir the source, keep it as pwd of some process
1145          *  and merrily kill the link to whatever was created under the
1146          *  same name. Goodbye sticky bit ;-<
1147          */
1148         if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno)
1149                 goto bail;
1150
1151         /* check if the target already exists (in which case we need
1152          * to delete it */
1153         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1154                                           new_dentry->d_name.len,
1155                                           &newfe_blkno, new_dir, &new_de_bh,
1156                                           &new_de);
1157         /* The only error we allow here is -ENOENT because the new
1158          * file not existing is perfectly valid. */
1159         if ((status < 0) && (status != -ENOENT)) {
1160                 /* If we cannot find the file specified we should just */
1161                 /* return the error... */
1162                 mlog_errno(status);
1163                 goto bail;
1164         }
1165
1166         if (!new_de && new_inode)
1167                 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1168                      "directory!", new_inode->i_ino);
1169
1170         /* In case we need to overwrite an existing file, we blow it
1171          * away first */
1172         if (new_de) {
1173                 /* VFS didn't think there existed an inode here, but
1174                  * someone else in the cluster must have raced our
1175                  * rename to create one. Today we error cleanly, in
1176                  * the future we should consider calling iget to build
1177                  * a new struct inode for this entry. */
1178                 if (!new_inode) {
1179                         status = -EACCES;
1180
1181                         mlog(0, "We found an inode for name %.*s but VFS "
1182                              "didn't give us one.\n", new_dentry->d_name.len,
1183                              new_dentry->d_name.name);
1184                         goto bail;
1185                 }
1186
1187                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1188                         status = -EACCES;
1189
1190                         mlog(0, "Inode blkno (%"MLFu64") and dir (%"MLFu64") "
1191                              "disagree. ip_flags = %x\n",
1192                              OCFS2_I(new_inode)->ip_blkno, newfe_blkno,
1193                              OCFS2_I(new_inode)->ip_flags);
1194                         goto bail;
1195                 }
1196
1197                 status = ocfs2_meta_lock(new_inode, handle, &newfe_bh, 1);
1198                 if (status < 0) {
1199                         if (status != -ENOENT)
1200                                 mlog_errno(status);
1201                         goto bail;
1202                 }
1203
1204                 if (S_ISDIR(new_inode->i_mode))
1205                         links_count = 0;
1206                 else
1207                         links_count = (unsigned int) (new_inode->i_nlink - 1);
1208
1209                 status = ocfs2_request_unlink_vote(new_inode, new_dentry,
1210                                                    links_count);
1211                 if (status < 0) {
1212                         mlog_errno(status);
1213                         goto bail;
1214                 }
1215
1216                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1217
1218                 mlog(0, "aha rename over existing... new_de=%p "
1219                      "new_blkno=%"MLFu64" newfebh=%p bhblocknr=%llu\n",
1220                      new_de, newfe_blkno, newfe_bh, newfe_bh ?
1221                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1222
1223                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1224                         status = ocfs2_prepare_orphan_dir(osb, handle,
1225                                                           new_inode,
1226                                                           orphan_name,
1227                                                           &orphan_entry_bh);
1228                         if (status < 0) {
1229                                 mlog_errno(status);
1230                                 goto bail;
1231                         }
1232                 }
1233         } else {
1234                 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1235
1236                 status = ocfs2_check_dir_for_entry(new_dir,
1237                                                    new_dentry->d_name.name,
1238                                                    new_dentry->d_name.len);
1239                 if (status)
1240                         goto bail;
1241
1242                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1243                                                       new_dentry->d_name.name,
1244                                                       new_dentry->d_name.len,
1245                                                       &insert_entry_bh);
1246                 if (status < 0) {
1247                         mlog_errno(status);
1248                         goto bail;
1249                 }
1250         }
1251
1252         handle = ocfs2_start_trans(osb, handle, OCFS2_RENAME_CREDITS);
1253         if (IS_ERR(handle)) {
1254                 status = PTR_ERR(handle);
1255                 handle = NULL;
1256                 mlog_errno(status);
1257                 goto bail;
1258         }
1259
1260         if (new_de) {
1261                 if (S_ISDIR(new_inode->i_mode)) {
1262                         if (!ocfs2_empty_dir(new_inode) ||
1263                             new_inode->i_nlink != 2) {
1264                                 status = -ENOTEMPTY;
1265                                 goto bail;
1266                         }
1267                 }
1268                 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1269                                               OCFS2_JOURNAL_ACCESS_WRITE);
1270                 if (status < 0) {
1271                         mlog_errno(status);
1272                         goto bail;
1273                 }
1274
1275                 if (S_ISDIR(new_inode->i_mode) ||
1276                     (newfe->i_links_count == cpu_to_le16(1))){
1277                         status = ocfs2_orphan_add(osb, handle, new_inode,
1278                                                   newfe, orphan_name,
1279                                                   orphan_entry_bh);
1280                         if (status < 0) {
1281                                 mlog_errno(status);
1282                                 goto bail;
1283                         }
1284                 }
1285
1286                 /* change the dirent to point to the correct inode */
1287                 status = ocfs2_journal_access(handle, new_dir, new_de_bh,
1288                                               OCFS2_JOURNAL_ACCESS_WRITE);
1289                 if (status < 0) {
1290                         mlog_errno(status);
1291                         goto bail;
1292                 }
1293                 new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno);
1294                 new_de->file_type = old_de->file_type;
1295                 new_dir->i_version++;
1296                 status = ocfs2_journal_dirty(handle, new_de_bh);
1297                 if (status < 0) {
1298                         mlog_errno(status);
1299                         goto bail;
1300                 }
1301
1302                 if (S_ISDIR(new_inode->i_mode))
1303                         newfe->i_links_count = 0;
1304                 else
1305                         le16_add_cpu(&newfe->i_links_count, -1);
1306
1307                 status = ocfs2_journal_dirty(handle, newfe_bh);
1308                 if (status < 0) {
1309                         mlog_errno(status);
1310                         goto bail;
1311                 }
1312         } else {
1313                 /* if the name was not found in new_dir, add it now */
1314                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1315                                          OCFS2_I(old_inode)->ip_blkno,
1316                                          new_dir_bh, insert_entry_bh);
1317         }
1318
1319         old_inode->i_ctime = CURRENT_TIME;
1320         mark_inode_dirty(old_inode);
1321
1322         /* now that the name has been added to new_dir, remove the old name */
1323         status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1324         if (status < 0) {
1325                 mlog_errno(status);
1326                 goto bail;
1327         }
1328
1329         if (new_inode) {
1330                 new_inode->i_nlink--;
1331                 new_inode->i_ctime = CURRENT_TIME;
1332         }
1333         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1334         if (old_inode_de_bh) {
1335                 status = ocfs2_journal_access(handle, old_inode,
1336                                              old_inode_de_bh,
1337                                              OCFS2_JOURNAL_ACCESS_WRITE);
1338                 PARENT_INO(old_inode_de_bh->b_data) =
1339                         cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
1340                 status = ocfs2_journal_dirty(handle, old_inode_de_bh);
1341                 old_dir->i_nlink--;
1342                 if (new_inode) {
1343                         new_inode->i_nlink--;
1344                 } else {
1345                         new_dir->i_nlink++;
1346                         mark_inode_dirty(new_dir);
1347                 }
1348         }
1349         mark_inode_dirty(old_dir);
1350         if (new_inode)
1351                 mark_inode_dirty(new_inode);
1352
1353         if (old_dir != new_dir)
1354                 if (new_dir_nlink != new_dir->i_nlink) {
1355                         if (!new_dir_bh) {
1356                                 mlog(ML_ERROR, "need to change nlink for new "
1357                                      "dir %"MLFu64" from %d to %d but bh is "
1358                                      "NULL\n", OCFS2_I(new_dir)->ip_blkno,
1359                                      (int)new_dir_nlink, new_dir->i_nlink);
1360                         } else {
1361                                 struct ocfs2_dinode *fe;
1362                                 status = ocfs2_journal_access(handle,
1363                                                               new_dir,
1364                                                               new_dir_bh,
1365                                                               OCFS2_JOURNAL_ACCESS_WRITE);
1366                                 fe = (struct ocfs2_dinode *) new_dir_bh->b_data;
1367                                 fe->i_links_count = cpu_to_le16(new_dir->i_nlink);
1368                                 status = ocfs2_journal_dirty(handle, new_dir_bh);
1369                         }
1370                 }
1371
1372         if (old_dir_nlink != old_dir->i_nlink) {
1373                 if (!old_dir_bh) {
1374                         mlog(ML_ERROR, "need to change nlink for old dir "
1375                              "%"MLFu64" from %d to %d but bh is NULL!\n",
1376                              OCFS2_I(old_dir)->ip_blkno,
1377                              (int)old_dir_nlink,
1378                              old_dir->i_nlink);
1379                 } else {
1380                         struct ocfs2_dinode *fe;
1381                         status = ocfs2_journal_access(handle, old_dir,
1382                                                       old_dir_bh,
1383                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1384                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1385                         fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1386                         status = ocfs2_journal_dirty(handle, old_dir_bh);
1387                 }
1388         }
1389
1390         status = 0;
1391 bail:
1392         if (rename_lock)
1393                 ocfs2_rename_unlock(osb);
1394
1395         if (handle)
1396                 ocfs2_commit_trans(handle);
1397
1398         if (new_inode)
1399                 sync_mapping_buffers(old_inode->i_mapping);
1400
1401         if (new_inode)
1402                 iput(new_inode);
1403         if (newfe_bh)
1404                 brelse(newfe_bh);
1405         if (old_dir_bh)
1406                 brelse(old_dir_bh);
1407         if (new_dir_bh)
1408                 brelse(new_dir_bh);
1409         if (new_de_bh)
1410                 brelse(new_de_bh);
1411         if (old_de_bh)
1412                 brelse(old_de_bh);
1413         if (old_inode_de_bh)
1414                 brelse(old_inode_de_bh);
1415         if (orphan_entry_bh)
1416                 brelse(orphan_entry_bh);
1417         if (insert_entry_bh)
1418                 brelse(insert_entry_bh);
1419
1420         mlog_exit(status);
1421
1422         return status;
1423 }
1424
1425 /*
1426  * we expect i_size = strlen(symname). Copy symname into the file
1427  * data, including the null terminator.
1428  */
1429 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1430                                      struct ocfs2_journal_handle *handle,
1431                                      struct inode *inode,
1432                                      const char *symname)
1433 {
1434         struct buffer_head **bhs = NULL;
1435         const char *c;
1436         struct super_block *sb = osb->sb;
1437         u64 p_blkno;
1438         int p_blocks;
1439         int virtual, blocks, status, i, bytes_left;
1440
1441         bytes_left = i_size_read(inode) + 1;
1442         /* we can't trust i_blocks because we're actually going to
1443          * write i_size + 1 bytes. */
1444         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1445
1446         mlog_entry("i_blocks = %lu, i_size = %llu, blocks = %d\n",
1447                        inode->i_blocks, i_size_read(inode), blocks);
1448
1449         /* Sanity check -- make sure we're going to fit. */
1450         if (bytes_left >
1451             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1452                 status = -EIO;
1453                 mlog_errno(status);
1454                 goto bail;
1455         }
1456
1457         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1458         if (!bhs) {
1459                 status = -ENOMEM;
1460                 mlog_errno(status);
1461                 goto bail;
1462         }
1463
1464         status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno,
1465                                              &p_blocks);
1466         if (status < 0) {
1467                 mlog_errno(status);
1468                 goto bail;
1469         }
1470
1471         /* links can never be larger than one cluster so we know this
1472          * is all going to be contiguous, but do a sanity check
1473          * anyway. */
1474         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1475                 status = -EIO;
1476                 mlog_errno(status);
1477                 goto bail;
1478         }
1479
1480         virtual = 0;
1481         while(bytes_left > 0) {
1482                 c = &symname[virtual * sb->s_blocksize];
1483
1484                 bhs[virtual] = sb_getblk(sb, p_blkno);
1485                 if (!bhs[virtual]) {
1486                         status = -ENOMEM;
1487                         mlog_errno(status);
1488                         goto bail;
1489                 }
1490                 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1491
1492                 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1493                                               OCFS2_JOURNAL_ACCESS_CREATE);
1494                 if (status < 0) {
1495                         mlog_errno(status);
1496                         goto bail;
1497                 }
1498
1499                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1500
1501                 memcpy(bhs[virtual]->b_data, c,
1502                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1503                        bytes_left);
1504
1505                 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1506                 if (status < 0) {
1507                         mlog_errno(status);
1508                         goto bail;
1509                 }
1510
1511                 virtual++;
1512                 p_blkno++;
1513                 bytes_left -= sb->s_blocksize;
1514         }
1515
1516         status = 0;
1517 bail:
1518
1519         if (bhs) {
1520                 for(i = 0; i < blocks; i++)
1521                         if (bhs[i])
1522                                 brelse(bhs[i]);
1523                 kfree(bhs);
1524         }
1525
1526         mlog_exit(status);
1527         return status;
1528 }
1529
1530 static int ocfs2_symlink(struct inode *dir,
1531                          struct dentry *dentry,
1532                          const char *symname)
1533 {
1534         int status, l, credits;
1535         u64 newsize;
1536         struct ocfs2_super *osb = NULL;
1537         struct inode *inode = NULL;
1538         struct super_block *sb;
1539         struct buffer_head *new_fe_bh = NULL;
1540         struct buffer_head *de_bh = NULL;
1541         struct buffer_head *parent_fe_bh = NULL;
1542         struct ocfs2_dinode *fe = NULL;
1543         struct ocfs2_dinode *dirfe;
1544         struct ocfs2_journal_handle *handle = NULL;
1545         struct ocfs2_alloc_context *inode_ac = NULL;
1546         struct ocfs2_alloc_context *data_ac = NULL;
1547
1548         mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1549                    dentry, symname, dentry->d_name.len, dentry->d_name.name);
1550
1551         sb = dir->i_sb;
1552         osb = OCFS2_SB(sb);
1553
1554         l = strlen(symname) + 1;
1555
1556         credits = ocfs2_calc_symlink_credits(sb);
1557
1558         handle = ocfs2_alloc_handle(osb);
1559         if (handle == NULL) {
1560                 status = -ENOMEM;
1561                 mlog_errno(status);
1562                 goto bail;
1563         }
1564
1565         /* lock the parent directory */
1566         status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
1567         if (status < 0) {
1568                 if (status != -ENOENT)
1569                         mlog_errno(status);
1570                 goto bail;
1571         }
1572
1573         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1574         if (!dirfe->i_links_count) {
1575                 /* can't make a file in a deleted directory. */
1576                 status = -ENOENT;
1577                 goto bail;
1578         }
1579
1580         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1581                                            dentry->d_name.len);
1582         if (status)
1583                 goto bail;
1584
1585         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1586                                               dentry->d_name.name,
1587                                               dentry->d_name.len, &de_bh);
1588         if (status < 0) {
1589                 mlog_errno(status);
1590                 goto bail;
1591         }
1592
1593         status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
1594         if (status < 0) {
1595                 if (status != -ENOSPC)
1596                         mlog_errno(status);
1597                 goto bail;
1598         }
1599
1600         /* don't reserve bitmap space for fast symlinks. */
1601         if (l > ocfs2_fast_symlink_chars(sb)) {
1602                 status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
1603                 if (status < 0) {
1604                         if (status != -ENOSPC)
1605                                 mlog_errno(status);
1606                         goto bail;
1607                 }
1608         }
1609
1610         handle = ocfs2_start_trans(osb, handle, credits);
1611         if (IS_ERR(handle)) {
1612                 status = PTR_ERR(handle);
1613                 handle = NULL;
1614                 mlog_errno(status);
1615                 goto bail;
1616         }
1617
1618         status = ocfs2_mknod_locked(osb, dir, dentry,
1619                                     S_IFLNK | S_IRWXUGO, 0,
1620                                     &new_fe_bh, parent_fe_bh, handle,
1621                                     &inode, inode_ac);
1622         if (status < 0) {
1623                 mlog_errno(status);
1624                 goto bail;
1625         }
1626
1627         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1628         inode->i_rdev = 0;
1629         newsize = l - 1;
1630         if (l > ocfs2_fast_symlink_chars(sb)) {
1631                 inode->i_op = &ocfs2_symlink_inode_operations;
1632                 status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh,
1633                                                     handle, data_ac, NULL,
1634                                                     NULL);
1635                 if (status < 0) {
1636                         if (status != -ENOSPC && status != -EINTR) {
1637                                 mlog(ML_ERROR, "Failed to extend file to "
1638                                                "%"MLFu64"\n",
1639                                      newsize);
1640                                 mlog_errno(status);
1641                                 status = -ENOSPC;
1642                         }
1643                         goto bail;
1644                 }
1645                 i_size_write(inode, newsize);
1646                 inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize);
1647         } else {
1648                 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1649                 memcpy((char *) fe->id2.i_symlink, symname, l);
1650                 i_size_write(inode, newsize);
1651                 inode->i_blocks = 0;
1652         }
1653
1654         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1655         if (status < 0) {
1656                 mlog_errno(status);
1657                 goto bail;
1658         }
1659
1660         if (!ocfs2_inode_is_fast_symlink(inode)) {
1661                 status = ocfs2_create_symlink_data(osb, handle, inode,
1662                                                    symname);
1663                 if (status < 0) {
1664                         mlog_errno(status);
1665                         goto bail;
1666                 }
1667         }
1668
1669         status = ocfs2_add_entry(handle, dentry, inode,
1670                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
1671                                  de_bh);
1672         if (status < 0) {
1673                 mlog_errno(status);
1674                 goto bail;
1675         }
1676
1677         insert_inode_hash(inode);
1678         dentry->d_op = &ocfs2_dentry_ops;
1679         d_instantiate(dentry, inode);
1680 bail:
1681         if (handle)
1682                 ocfs2_commit_trans(handle);
1683         if (new_fe_bh)
1684                 brelse(new_fe_bh);
1685         if (parent_fe_bh)
1686                 brelse(parent_fe_bh);
1687         if (de_bh)
1688                 brelse(de_bh);
1689         if (inode_ac)
1690                 ocfs2_free_alloc_context(inode_ac);
1691         if (data_ac)
1692                 ocfs2_free_alloc_context(data_ac);
1693         if ((status < 0) && inode)
1694                 iput(inode);
1695
1696         mlog_exit(status);
1697
1698         return status;
1699 }
1700
1701 int ocfs2_check_dir_entry(struct inode * dir,
1702                           struct ocfs2_dir_entry * de,
1703                           struct buffer_head * bh,
1704                           unsigned long offset)
1705 {
1706         const char *error_msg = NULL;
1707         const int rlen = le16_to_cpu(de->rec_len);
1708
1709         if (rlen < OCFS2_DIR_REC_LEN(1))
1710                 error_msg = "rec_len is smaller than minimal";
1711         else if (rlen % 4 != 0)
1712                 error_msg = "rec_len % 4 != 0";
1713         else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
1714                 error_msg = "rec_len is too small for name_len";
1715         else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
1716                 error_msg = "directory entry across blocks";
1717
1718         if (error_msg != NULL)
1719                 mlog(ML_ERROR, "bad entry in directory #%"MLFu64": %s - "
1720                      "offset=%lu, inode=%"MLFu64", rec_len=%d, name_len=%d\n",
1721                      OCFS2_I(dir)->ip_blkno, error_msg, offset,
1722                      le64_to_cpu(de->inode), rlen, de->name_len);
1723         return error_msg == NULL ? 1 : 0;
1724 }
1725
1726 /* we don't always have a dentry for what we want to add, so people
1727  * like orphan dir can call this instead.
1728  *
1729  * If you pass me insert_bh, I'll skip the search of the other dir
1730  * blocks and put the record in there.
1731  */
1732 static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle,
1733                              struct inode *dir,
1734                              const char *name, int namelen,
1735                              struct inode *inode, u64 blkno,
1736                              struct buffer_head *parent_fe_bh,
1737                              struct buffer_head *insert_bh)
1738 {
1739         unsigned long offset;
1740         unsigned short rec_len;
1741         struct ocfs2_dir_entry *de, *de1;
1742         struct super_block *sb;
1743         int retval, status;
1744
1745         mlog_entry_void();
1746
1747         sb = dir->i_sb;
1748
1749         if (!namelen)
1750                 return -EINVAL;
1751
1752         rec_len = OCFS2_DIR_REC_LEN(namelen);
1753         offset = 0;
1754         de = (struct ocfs2_dir_entry *) insert_bh->b_data;
1755         while (1) {
1756                 BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data);
1757                 /* These checks should've already been passed by the
1758                  * prepare function, but I guess we can leave them
1759                  * here anyway. */
1760                 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
1761                         retval = -ENOENT;
1762                         goto bail;
1763                 }
1764                 if (ocfs2_match(namelen, name, de)) {
1765                         retval = -EEXIST;
1766                         goto bail;
1767                 }
1768                 if (((le64_to_cpu(de->inode) == 0) &&
1769                      (le16_to_cpu(de->rec_len) >= rec_len)) ||
1770                     (le16_to_cpu(de->rec_len) >=
1771                      (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
1772                         status = ocfs2_journal_access(handle, dir, insert_bh,
1773                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1774                         /* By now the buffer is marked for journaling */
1775                         offset += le16_to_cpu(de->rec_len);
1776                         if (le64_to_cpu(de->inode)) {
1777                                 de1 = (struct ocfs2_dir_entry *)((char *) de +
1778                                         OCFS2_DIR_REC_LEN(de->name_len));
1779                                 de1->rec_len =
1780                                         cpu_to_le16(le16_to_cpu(de->rec_len) -
1781                                         OCFS2_DIR_REC_LEN(de->name_len));
1782                                 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1783                                 de = de1;
1784                         }
1785                         de->file_type = OCFS2_FT_UNKNOWN;
1786                         if (blkno) {
1787                                 de->inode = cpu_to_le64(blkno);
1788                                 ocfs2_set_de_type(de, inode->i_mode);
1789                         } else
1790                                 de->inode = 0;
1791                         de->name_len = namelen;
1792                         memcpy(de->name, name, namelen);
1793
1794                         dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1795                         dir->i_version++;
1796                         status = ocfs2_journal_dirty(handle, insert_bh);
1797                         retval = 0;
1798                         goto bail;
1799                 }
1800                 offset += le16_to_cpu(de->rec_len);
1801                 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
1802         }
1803
1804         /* when you think about it, the assert above should prevent us
1805          * from ever getting here. */
1806         retval = -ENOSPC;
1807 bail:
1808
1809         mlog_exit(retval);
1810         return retval;
1811 }
1812
1813
1814 /*
1815  * ocfs2_delete_entry deletes a directory entry by merging it with the
1816  * previous entry
1817  */
1818 static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle,
1819                               struct inode *dir,
1820                               struct ocfs2_dir_entry *de_del,
1821                               struct buffer_head *bh)
1822 {
1823         struct ocfs2_dir_entry *de, *pde;
1824         int i, status = -ENOENT;
1825
1826         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
1827
1828         i = 0;
1829         pde = NULL;
1830         de = (struct ocfs2_dir_entry *) bh->b_data;
1831         while (i < bh->b_size) {
1832                 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
1833                         status = -EIO;
1834                         mlog_errno(status);
1835                         goto bail;
1836                 }
1837                 if (de == de_del)  {
1838                         status = ocfs2_journal_access(handle, dir, bh,
1839                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1840                         if (status < 0) {
1841                                 status = -EIO;
1842                                 mlog_errno(status);
1843                                 goto bail;
1844                         }
1845                         if (pde)
1846                                 pde->rec_len =
1847                                         cpu_to_le16(le16_to_cpu(pde->rec_len) +
1848                                                     le16_to_cpu(de->rec_len));
1849                         else
1850                                 de->inode = 0;
1851                         dir->i_version++;
1852                         status = ocfs2_journal_dirty(handle, bh);
1853                         goto bail;
1854                 }
1855                 i += le16_to_cpu(de->rec_len);
1856                 pde = de;
1857                 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
1858         }
1859 bail:
1860         mlog_exit(status);
1861         return status;
1862 }
1863
1864 /*
1865  * Returns 0 if not found, -1 on failure, and 1 on success
1866  */
1867 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
1868                                         struct inode *dir,
1869                                         const char *name, int namelen,
1870                                         unsigned long offset,
1871                                         struct ocfs2_dir_entry **res_dir)
1872 {
1873         struct ocfs2_dir_entry *de;
1874         char *dlimit, *de_buf;
1875         int de_len;
1876         int ret = 0;
1877
1878         mlog_entry_void();
1879
1880         de_buf = bh->b_data;
1881         dlimit = de_buf + dir->i_sb->s_blocksize;
1882
1883         while (de_buf < dlimit) {
1884                 /* this code is executed quadratically often */
1885                 /* do minimal checking `by hand' */
1886
1887                 de = (struct ocfs2_dir_entry *) de_buf;
1888
1889                 if (de_buf + namelen <= dlimit &&
1890                     ocfs2_match(namelen, name, de)) {
1891                         /* found a match - just to be sure, do a full check */
1892                         if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
1893                                 ret = -1;
1894                                 goto bail;
1895                         }
1896                         *res_dir = de;
1897                         ret = 1;
1898                         goto bail;
1899                 }
1900
1901                 /* prevent looping on a bad block */
1902                 de_len = le16_to_cpu(de->rec_len);
1903                 if (de_len <= 0) {
1904                         ret = -1;
1905                         goto bail;
1906                 }
1907
1908                 de_buf += de_len;
1909                 offset += de_len;
1910         }
1911
1912 bail:
1913         mlog_exit(ret);
1914         return ret;
1915 }
1916
1917 struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
1918                                      struct inode *dir,
1919                                      struct ocfs2_dir_entry **res_dir)
1920 {
1921         struct super_block *sb;
1922         struct buffer_head *bh_use[NAMEI_RA_SIZE];
1923         struct buffer_head *bh, *ret = NULL;
1924         unsigned long start, block, b;
1925         int ra_max = 0;         /* Number of bh's in the readahead
1926                                    buffer, bh_use[] */
1927         int ra_ptr = 0;         /* Current index into readahead
1928                                    buffer */
1929         int num = 0;
1930         int nblocks, i, err;
1931
1932         mlog_entry_void();
1933
1934         *res_dir = NULL;
1935         sb = dir->i_sb;
1936
1937         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
1938         start = OCFS2_I(dir)->ip_dir_start_lookup;
1939         if (start >= nblocks)
1940                 start = 0;
1941         block = start;
1942
1943 restart:
1944         do {
1945                 /*
1946                  * We deal with the read-ahead logic here.
1947                  */
1948                 if (ra_ptr >= ra_max) {
1949                         /* Refill the readahead buffer */
1950                         ra_ptr = 0;
1951                         b = block;
1952                         for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
1953                                 /*
1954                                  * Terminate if we reach the end of the
1955                                  * directory and must wrap, or if our
1956                                  * search has finished at this block.
1957                                  */
1958                                 if (b >= nblocks || (num && block == start)) {
1959                                         bh_use[ra_max] = NULL;
1960                                         break;
1961                                 }
1962                                 num++;
1963
1964                                 /* XXX: questionable readahead stuff here */
1965                                 bh = ocfs2_bread(dir, b++, &err, 1);
1966                                 bh_use[ra_max] = bh;
1967 #if 0           // ???
1968                                 if (bh)
1969                                         ll_rw_block(READ, 1, &bh);
1970 #endif
1971                         }
1972                 }
1973                 if ((bh = bh_use[ra_ptr++]) == NULL)
1974                         goto next;
1975                 wait_on_buffer(bh);
1976                 if (!buffer_uptodate(bh)) {
1977                         /* read error, skip block & hope for the best */
1978                         brelse(bh);
1979                         goto next;
1980                 }
1981                 i = ocfs2_search_dirblock(bh, dir, name, namelen,
1982                                           block << sb->s_blocksize_bits,
1983                                           res_dir);
1984                 if (i == 1) {
1985                         OCFS2_I(dir)->ip_dir_start_lookup = block;
1986                         ret = bh;
1987                         goto cleanup_and_exit;
1988                 } else {
1989                         brelse(bh);
1990                         if (i < 0)
1991                                 goto cleanup_and_exit;
1992                 }
1993         next:
1994                 if (++block >= nblocks)
1995                         block = 0;
1996         } while (block != start);
1997
1998         /*
1999          * If the directory has grown while we were searching, then
2000          * search the last part of the directory before giving up.
2001          */
2002         block = nblocks;
2003         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2004         if (block < nblocks) {
2005                 start = 0;
2006                 goto restart;
2007         }
2008
2009 cleanup_and_exit:
2010         /* Clean up the read-ahead blocks */
2011         for (; ra_ptr < ra_max; ra_ptr++)
2012                 brelse(bh_use[ra_ptr]);
2013
2014         mlog_exit_ptr(ret);
2015         return ret;
2016 }
2017
2018 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2019 {
2020         int status, namelen;
2021
2022         mlog_entry_void();
2023
2024         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016"MLFx64,
2025                            blkno);
2026         if (namelen <= 0) {
2027                 if (namelen)
2028                         status = namelen;
2029                 else
2030                         status = -EINVAL;
2031                 mlog_errno(status);
2032                 goto bail;
2033         }
2034         if (namelen != OCFS2_ORPHAN_NAMELEN) {
2035                 status = -EINVAL;
2036                 mlog_errno(status);
2037                 goto bail;
2038         }
2039
2040         mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
2041              namelen);
2042
2043         status = 0;
2044 bail:
2045         mlog_exit(status);
2046         return status;
2047 }
2048
2049 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2050                                     struct ocfs2_journal_handle *handle,
2051                                     struct inode *inode,
2052                                     char *name,
2053                                     struct buffer_head **de_bh)
2054 {
2055         struct inode *orphan_dir_inode = NULL;
2056         struct buffer_head *orphan_dir_bh = NULL;
2057         int status = 0;
2058
2059         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2060         if (status < 0) {
2061                 mlog_errno(status);
2062                 goto leave;
2063         }
2064
2065         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2066                                                        ORPHAN_DIR_SYSTEM_INODE,
2067                                                        osb->slot_num);
2068         if (!orphan_dir_inode) {
2069                 status = -ENOENT;
2070                 mlog_errno(status);
2071                 goto leave;
2072         }
2073
2074         ocfs2_handle_add_inode(handle, orphan_dir_inode);
2075         status = ocfs2_meta_lock(orphan_dir_inode, handle, &orphan_dir_bh, 1);
2076         if (status < 0) {
2077                 mlog_errno(status);
2078                 goto leave;
2079         }
2080
2081         status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2082                                               orphan_dir_bh, name,
2083                                               OCFS2_ORPHAN_NAMELEN, de_bh);
2084         if (status < 0) {
2085                 mlog_errno(status);
2086                 goto leave;
2087         }
2088
2089 leave:
2090         if (orphan_dir_inode)
2091                 iput(orphan_dir_inode);
2092
2093         if (orphan_dir_bh)
2094                 brelse(orphan_dir_bh);
2095
2096         mlog_exit(status);
2097         return status;
2098 }
2099
2100 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2101                             struct ocfs2_journal_handle *handle,
2102                             struct inode *inode,
2103                             struct ocfs2_dinode *fe,
2104                             char *name,
2105                             struct buffer_head *de_bh)
2106 {
2107         struct inode *orphan_dir_inode = NULL;
2108         struct buffer_head *orphan_dir_bh = NULL;
2109         int status = 0;
2110         struct ocfs2_dinode *orphan_fe;
2111
2112         mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
2113
2114         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2115                                                        ORPHAN_DIR_SYSTEM_INODE,
2116                                                        osb->slot_num);
2117         if (!orphan_dir_inode) {
2118                 status = -ENOENT;
2119                 mlog_errno(status);
2120                 goto leave;
2121         }
2122
2123         status = ocfs2_read_block(osb,
2124                                   OCFS2_I(orphan_dir_inode)->ip_blkno,
2125                                   &orphan_dir_bh, OCFS2_BH_CACHED,
2126                                   orphan_dir_inode);
2127         if (status < 0) {
2128                 mlog_errno(status);
2129                 goto leave;
2130         }
2131
2132         status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
2133                                       OCFS2_JOURNAL_ACCESS_WRITE);
2134         if (status < 0) {
2135                 mlog_errno(status);
2136                 goto leave;
2137         }
2138
2139         /* we're a cluster, and nlink can change on disk from
2140          * underneath us... */
2141         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2142         if (S_ISDIR(inode->i_mode))
2143                 le16_add_cpu(&orphan_fe->i_links_count, 1);
2144         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2145
2146         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2147         if (status < 0) {
2148                 mlog_errno(status);
2149                 goto leave;
2150         }
2151
2152         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2153                                    OCFS2_ORPHAN_NAMELEN, inode,
2154                                    OCFS2_I(inode)->ip_blkno,
2155                                    orphan_dir_bh, de_bh);
2156         if (status < 0) {
2157                 mlog_errno(status);
2158                 goto leave;
2159         }
2160
2161         le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2162
2163         /* Record which orphan dir our inode now resides
2164          * in. delete_inode will use this to determine which orphan
2165          * dir to lock. */
2166         spin_lock(&OCFS2_I(inode)->ip_lock);
2167         OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num;
2168         spin_unlock(&OCFS2_I(inode)->ip_lock);
2169
2170         mlog(0, "Inode %"MLFu64" orphaned in slot %d\n",
2171              OCFS2_I(inode)->ip_blkno, osb->slot_num);
2172
2173 leave:
2174         if (orphan_dir_inode)
2175                 iput(orphan_dir_inode);
2176
2177         if (orphan_dir_bh)
2178                 brelse(orphan_dir_bh);
2179
2180         mlog_exit(status);
2181         return status;
2182 }
2183
2184 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2185 int ocfs2_orphan_del(struct ocfs2_super *osb,
2186                      struct ocfs2_journal_handle *handle,
2187                      struct inode *orphan_dir_inode,
2188                      struct inode *inode,
2189                      struct buffer_head *orphan_dir_bh)
2190 {
2191         char name[OCFS2_ORPHAN_NAMELEN + 1];
2192         struct ocfs2_dinode *orphan_fe;
2193         int status = 0;
2194         struct buffer_head *target_de_bh = NULL;
2195         struct ocfs2_dir_entry *target_de = NULL;
2196
2197         mlog_entry_void();
2198
2199         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2200         if (status < 0) {
2201                 mlog_errno(status);
2202                 goto leave;
2203         }
2204
2205         mlog(0, "removing '%s' from orphan dir %"MLFu64" (namelen=%d)\n",
2206              name, OCFS2_I(orphan_dir_inode)->ip_blkno, OCFS2_ORPHAN_NAMELEN);
2207
2208         /* find it's spot in the orphan directory */
2209         target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
2210                                         orphan_dir_inode, &target_de);
2211         if (!target_de_bh) {
2212                 status = -ENOENT;
2213                 mlog_errno(status);
2214                 goto leave;
2215         }
2216
2217         /* remove it from the orphan directory */
2218         status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
2219                                     target_de_bh);
2220         if (status < 0) {
2221                 mlog_errno(status);
2222                 goto leave;
2223         }
2224
2225         status = ocfs2_journal_access(handle,orphan_dir_inode,  orphan_dir_bh,
2226                                       OCFS2_JOURNAL_ACCESS_WRITE);
2227         if (status < 0) {
2228                 mlog_errno(status);
2229                 goto leave;
2230         }
2231
2232         /* do the i_nlink dance! :) */
2233         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2234         if (S_ISDIR(inode->i_mode))
2235                 le16_add_cpu(&orphan_fe->i_links_count, -1);
2236         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2237
2238         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2239         if (status < 0) {
2240                 mlog_errno(status);
2241                 goto leave;
2242         }
2243
2244 leave:
2245         if (target_de_bh)
2246                 brelse(target_de_bh);
2247
2248         mlog_exit(status);
2249         return status;
2250 }
2251
2252 struct inode_operations ocfs2_dir_iops = {
2253         .create         = ocfs2_create,
2254         .lookup         = ocfs2_lookup,
2255         .link           = ocfs2_link,
2256         .unlink         = ocfs2_unlink,
2257         .rmdir          = ocfs2_unlink,
2258         .symlink        = ocfs2_symlink,
2259         .mkdir          = ocfs2_mkdir,
2260         .mknod          = ocfs2_mknod,
2261         .rename         = ocfs2_rename,
2262         .setattr        = ocfs2_setattr,
2263         .getattr        = ocfs2_getattr,
2264 };