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 %llu\n", dentry->d_name.len,
 165              dentry->d_name.name, (unsigned long long)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 %llu\n",
 184                      (unsigned long long)blkno);
 185                 ret = ERR_PTR(-EACCES);
 186                 goto bail_unlock;
 187         }
 188
 189         oi = OCFS2_I(inode);
 190         /* Clear any orphaned state... If we were able to look up the
 191          * inode from a directory, it certainly can't be orphaned. We
 192          * might have the bad state from a node which intended to
 193          * orphan this inode but crashed before it could commit the
 194          * unlink. */
 195         spin_lock(&oi->ip_lock);
 196         oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
 197         oi->ip_orphaned_slot = OCFS2_INVALID_SLOT;
 198         spin_unlock(&oi->ip_lock);
 199
 200 bail_add:
 201
 202         dentry->d_op = &ocfs2_dentry_ops;
 203         ret = d_splice_alias(inode, dentry);
 204
 205 bail_unlock:
 206         /* Don't drop the cluster lock until *after* the d_add --
 207          * unlink on another node will message us to remove that
 208          * dentry under this lock so otherwise we can race this with
 209          * the vote thread and have a stale dentry. */
 210         ocfs2_meta_unlock(dir, 0);
 211
 212 bail:
 213         if (dirent_bh)
 214                 brelse(dirent_bh);
 215
 216         mlog_exit_ptr(ret);
 217
 218         return ret;
 219 }
 220
 221 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
 222                               struct ocfs2_journal_handle *handle,
 223                               struct inode *parent,
 224                               struct inode *inode,
 225                               struct buffer_head *fe_bh,
 226                               struct ocfs2_alloc_context *data_ac)
 227 {
 228         int status;
 229         struct buffer_head *new_bh = NULL;
 230         struct ocfs2_dir_entry *de = NULL;
 231
 232         mlog_entry_void();
 233
 234         status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
 235                                      data_ac, NULL, &new_bh);
 236         if (status < 0) {
 237                 mlog_errno(status);
 238                 goto bail;
 239         }
 240
 241         ocfs2_set_new_buffer_uptodate(inode, new_bh);
 242
 243         status = ocfs2_journal_access(handle, inode, new_bh,
 244                                       OCFS2_JOURNAL_ACCESS_CREATE);
 245         if (status < 0) {
 246                 mlog_errno(status);
 247                 goto bail;
 248         }
 249         memset(new_bh->b_data, 0, osb->sb->s_blocksize);
 250
 251         de = (struct ocfs2_dir_entry *) new_bh->b_data;
 252         de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
 253         de->name_len = 1;
 254         de->rec_len =
 255                 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
 256         strcpy(de->name, ".");
 257         ocfs2_set_de_type(de, S_IFDIR);
 258         de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
 259         de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
 260         de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize -
 261                                   OCFS2_DIR_REC_LEN(1));
 262         de->name_len = 2;
 263         strcpy(de->name, "..");
 264         ocfs2_set_de_type(de, S_IFDIR);
 265
 266         status = ocfs2_journal_dirty(handle, new_bh);
 267         if (status < 0) {
 268                 mlog_errno(status);
 269                 goto bail;
 270         }
 271
 272         i_size_write(inode, inode->i_sb->s_blocksize);
 273         inode->i_nlink = 2;
 274         inode->i_blocks = ocfs2_align_bytes_to_sectors(inode->i_sb->s_blocksize);
 275         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 276         if (status < 0) {
 277                 mlog_errno(status);
 278                 goto bail;
 279         }
 280
 281         status = 0;
 282 bail:
 283         if (new_bh)
 284                 brelse(new_bh);
 285
 286         mlog_exit(status);
 287         return status;
 288 }
 289
 290 static int ocfs2_mknod(struct inode *dir,
 291                        struct dentry *dentry,
 292                        int mode,
 293                        dev_t dev)
 294 {
 295         int status = 0;
 296         struct buffer_head *parent_fe_bh = NULL;
 297         struct ocfs2_journal_handle *handle = NULL;
 298         struct ocfs2_super *osb;
 299         struct ocfs2_dinode *dirfe;
 300         struct buffer_head *new_fe_bh = NULL;
 301         struct buffer_head *de_bh = NULL;
 302         struct inode *inode = NULL;
 303         struct ocfs2_alloc_context *inode_ac = NULL;
 304         struct ocfs2_alloc_context *data_ac = NULL;
 305
 306         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 307                    (unsigned long)dev, dentry->d_name.len,
 308                    dentry->d_name.name);
 309
 310         /* get our super block */
 311         osb = OCFS2_SB(dir->i_sb);
 312
 313         if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
 314                 mlog(ML_ERROR, "inode %llu has i_nlink of %u\n",
 315                      (unsigned long long)OCFS2_I(dir)->ip_blkno, dir->i_nlink);
 316                 status = -EMLINK;
 317                 goto leave;
 318         }
 319
 320         handle = ocfs2_alloc_handle(osb);
 321         if (handle == NULL) {
 322                 status = -ENOMEM;
 323                 mlog_errno(status);
 324                 goto leave;
 325         }
 326
 327         status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
 328         if (status < 0) {
 329                 if (status != -ENOENT)
 330                         mlog_errno(status);
 331                 goto leave;
 332         }
 333
 334         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
 335         if (!dirfe->i_links_count) {
 336                 /* can't make a file in a deleted directory. */
 337                 status = -ENOENT;
 338                 goto leave;
 339         }
 340
 341         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 342                                            dentry->d_name.len);
 343         if (status)
 344                 goto leave;
 345
 346         /* get a spot inside the dir. */
 347         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 348                                               dentry->d_name.name,
 349                                               dentry->d_name.len, &de_bh);
 350         if (status < 0) {
 351                 mlog_errno(status);
 352                 goto leave;
 353         }
 354
 355         /* reserve an inode spot */
 356         status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
 357         if (status < 0) {
 358                 if (status != -ENOSPC)
 359                         mlog_errno(status);
 360                 goto leave;
 361         }
 362
 363         /* are we making a directory? If so, reserve a cluster for his
 364          * 1st extent. */
 365         if (S_ISDIR(mode)) {
 366                 status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
 367                 if (status < 0) {
 368                         if (status != -ENOSPC)
 369                                 mlog_errno(status);
 370                         goto leave;
 371                 }
 372         }
 373
 374         handle = ocfs2_start_trans(osb, handle, OCFS2_MKNOD_CREDITS);
 375         if (IS_ERR(handle)) {
 376                 status = PTR_ERR(handle);
 377                 handle = NULL;
 378                 mlog_errno(status);
 379                 goto leave;
 380         }
 381
 382         /* do the real work now. */
 383         status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
 384                                     &new_fe_bh, parent_fe_bh, handle,
 385                                     &inode, inode_ac);
 386         if (status < 0) {
 387                 mlog_errno(status);
 388                 goto leave;
 389         }
 390
 391         if (S_ISDIR(mode)) {
 392                 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
 393                                             new_fe_bh, data_ac);
 394                 if (status < 0) {
 395                         mlog_errno(status);
 396                         goto leave;
 397                 }
 398
 399                 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
 400                                               OCFS2_JOURNAL_ACCESS_WRITE);
 401                 if (status < 0) {
 402                         mlog_errno(status);
 403                         goto leave;
 404                 }
 405                 le16_add_cpu(&dirfe->i_links_count, 1);
 406                 status = ocfs2_journal_dirty(handle, parent_fe_bh);
 407                 if (status < 0) {
 408                         mlog_errno(status);
 409                         goto leave;
 410                 }
 411                 dir->i_nlink++;
 412         }
 413
 414         status = ocfs2_add_entry(handle, dentry, inode,
 415                                  OCFS2_I(inode)->ip_blkno, parent_fe_bh,
 416                                  de_bh);
 417         if (status < 0) {
 418                 mlog_errno(status);
 419                 goto leave;
 420         }
 421
 422         insert_inode_hash(inode);
 423         dentry->d_op = &ocfs2_dentry_ops;
 424         d_instantiate(dentry, inode);
 425         status = 0;
 426 leave:
 427         if (handle)
 428                 ocfs2_commit_trans(handle);
 429
 430         if (status == -ENOSPC)
 431                 mlog(0, "Disk is full\n");
 432
 433         if (new_fe_bh)
 434                 brelse(new_fe_bh);
 435
 436         if (de_bh)
 437                 brelse(de_bh);
 438
 439         if (parent_fe_bh)
 440                 brelse(parent_fe_bh);
 441
 442         if ((status < 0) && inode)
 443                 iput(inode);
 444
 445         if (inode_ac)
 446                 ocfs2_free_alloc_context(inode_ac);
 447
 448         if (data_ac)
 449                 ocfs2_free_alloc_context(data_ac);
 450
 451         mlog_exit(status);
 452
 453         return status;
 454 }
 455
 456 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 457                               struct inode *dir,
 458                               struct dentry *dentry, int mode,
 459                               dev_t dev,
 460                               struct buffer_head **new_fe_bh,
 461                               struct buffer_head *parent_fe_bh,
 462                               struct ocfs2_journal_handle *handle,
 463                               struct inode **ret_inode,
 464                               struct ocfs2_alloc_context *inode_ac)
 465 {
 466         int status = 0;
 467         struct ocfs2_dinode *fe = NULL;
 468         struct ocfs2_extent_list *fel;
 469         u64 fe_blkno = 0;
 470         u16 suballoc_bit;
 471         struct inode *inode = NULL;
 472
 473         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 474                    (unsigned long)dev, dentry->d_name.len,
 475                    dentry->d_name.name);
 476
 477         *new_fe_bh = NULL;
 478         *ret_inode = NULL;
 479
 480         status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
 481                                        &fe_blkno);
 482         if (status < 0) {
 483                 mlog_errno(status);
 484                 goto leave;
 485         }
 486
 487         inode = new_inode(dir->i_sb);
 488         if (IS_ERR(inode)) {
 489                 status = PTR_ERR(inode);
 490                 mlog(ML_ERROR, "new_inode failed!\n");
 491                 goto leave;
 492         }
 493
 494         /* populate as many fields early on as possible - many of
 495          * these are used by the support functions here and in
 496          * callers. */
 497         inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
 498         OCFS2_I(inode)->ip_blkno = fe_blkno;
 499         if (S_ISDIR(mode))
 500                 inode->i_nlink = 2;
 501         else
 502                 inode->i_nlink = 1;
 503         inode->i_mode = mode;
 504         spin_lock(&osb->osb_lock);
 505         inode->i_generation = osb->s_next_generation++;
 506         spin_unlock(&osb->osb_lock);
 507
 508         *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
 509         if (!*new_fe_bh) {
 510                 status = -EIO;
 511                 mlog_errno(status);
 512                 goto leave;
 513         }
 514         ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
 515
 516         status = ocfs2_journal_access(handle, inode, *new_fe_bh,
 517                                       OCFS2_JOURNAL_ACCESS_CREATE);
 518         if (status < 0) {
 519                 mlog_errno(status);
 520                 goto leave;
 521         }
 522
 523         fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
 524         memset(fe, 0, osb->sb->s_blocksize);
 525
 526         fe->i_generation = cpu_to_le32(inode->i_generation);
 527         fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
 528         fe->i_blkno = cpu_to_le64(fe_blkno);
 529         fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
 530         fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
 531         fe->i_uid = cpu_to_le32(current->fsuid);
 532         if (dir->i_mode & S_ISGID) {
 533                 fe->i_gid = cpu_to_le32(dir->i_gid);
 534                 if (S_ISDIR(mode))
 535                         mode |= S_ISGID;
 536         } else
 537                 fe->i_gid = cpu_to_le32(current->fsgid);
 538         fe->i_mode = cpu_to_le16(mode);
 539         if (S_ISCHR(mode) || S_ISBLK(mode))
 540                 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
 541
 542         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 543
 544         fe->i_last_eb_blk = 0;
 545         strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
 546         le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
 547         fe->i_atime = fe->i_ctime = fe->i_mtime =
 548                 cpu_to_le64(CURRENT_TIME.tv_sec);
 549         fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
 550                 cpu_to_le32(CURRENT_TIME.tv_nsec);
 551         fe->i_dtime = 0;
 552
 553         fel = &fe->id2.i_list;
 554         fel->l_tree_depth = 0;
 555         fel->l_next_free_rec = 0;
 556         fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
 557
 558         status = ocfs2_journal_dirty(handle, *new_fe_bh);
 559         if (status < 0) {
 560                 mlog_errno(status);
 561                 goto leave;
 562         }
 563
 564         if (ocfs2_populate_inode(inode, fe, 1) < 0) {
 565                 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
 566                      "i_blkno=%llu, i_ino=%lu\n",
 567                      (unsigned long long) (*new_fe_bh)->b_blocknr,
 568                      (unsigned long long)fe->i_blkno, inode->i_ino);
 569                 BUG();
 570         }
 571
 572         ocfs2_inode_set_new(osb, inode);
 573         status = ocfs2_create_new_inode_locks(inode);
 574         if (status < 0)
 575                 mlog_errno(status);
 576
 577         status = 0; /* error in ocfs2_create_new_inode_locks is not
 578                      * critical */
 579
 580         *ret_inode = inode;
 581 leave:
 582         if (status < 0) {
 583                 if (*new_fe_bh) {
 584                         brelse(*new_fe_bh);
 585                         *new_fe_bh = NULL;
 586                 }
 587                 if (inode)
 588                         iput(inode);
 589         }
 590
 591         mlog_exit(status);
 592         return status;
 593 }
 594
 595 static int ocfs2_mkdir(struct inode *dir,
 596                        struct dentry *dentry,
 597                        int mode)
 598 {
 599         int ret;
 600
 601         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 602                    dentry->d_name.len, dentry->d_name.name);
 603         ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
 604         mlog_exit(ret);
 605
 606         return ret;
 607 }
 608
 609 static int ocfs2_create(struct inode *dir,
 610                         struct dentry *dentry,
 611                         int mode,
 612                         struct nameidata *nd)
 613 {
 614         int ret;
 615
 616         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 617                    dentry->d_name.len, dentry->d_name.name);
 618         ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
 619         mlog_exit(ret);
 620
 621         return ret;
 622 }
 623
 624 static int ocfs2_link(struct dentry *old_dentry,
 625                       struct inode *dir,
 626                       struct dentry *dentry)
 627 {
 628         struct ocfs2_journal_handle *handle = NULL;
 629         struct inode *inode = old_dentry->d_inode;
 630         int err;
 631         struct buffer_head *fe_bh = NULL;
 632         struct buffer_head *parent_fe_bh = NULL;
 633         struct buffer_head *de_bh = NULL;
 634         struct ocfs2_dinode *fe = NULL;
 635         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 636
 637         mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
 638                    old_dentry->d_name.len, old_dentry->d_name.name,
 639                    dentry->d_name.len, dentry->d_name.name);
 640
 641         if (S_ISDIR(inode->i_mode)) {
 642                 err = -EPERM;
 643                 goto bail;
 644         }
 645
 646         if (inode->i_nlink >= OCFS2_LINK_MAX) {
 647                 err = -EMLINK;
 648                 goto bail;
 649         }
 650
 651         handle = ocfs2_alloc_handle(osb);
 652         if (handle == NULL) {
 653                 err = -ENOMEM;
 654                 goto bail;
 655         }
 656
 657         err = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
 658         if (err < 0) {
 659                 if (err != -ENOENT)
 660                         mlog_errno(err);
 661                 goto bail;
 662         }
 663
 664         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 665                                         dentry->d_name.len);
 666         if (err)
 667                 goto bail;
 668
 669         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 670                                            dentry->d_name.name,
 671                                            dentry->d_name.len, &de_bh);
 672         if (err < 0) {
 673                 mlog_errno(err);
 674                 goto bail;
 675         }
 676
 677         err = ocfs2_meta_lock(inode, handle, &fe_bh, 1);
 678         if (err < 0) {
 679                 if (err != -ENOENT)
 680                         mlog_errno(err);
 681                 goto bail;
 682         }
 683
 684         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 685         if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
 686                 err = -EMLINK;
 687                 goto bail;
 688         }
 689
 690         handle = ocfs2_start_trans(osb, handle, OCFS2_LINK_CREDITS);
 691         if (IS_ERR(handle)) {
 692                 err = PTR_ERR(handle);
 693                 handle = NULL;
 694                 mlog_errno(err);
 695                 goto bail;
 696         }
 697
 698         err = ocfs2_journal_access(handle, inode, fe_bh,
 699                                    OCFS2_JOURNAL_ACCESS_WRITE);
 700         if (err < 0) {
 701                 mlog_errno(err);
 702                 goto bail;
 703         }
 704
 705         inode->i_nlink++;
 706         inode->i_ctime = CURRENT_TIME;
 707         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 708         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 709         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 710
 711         err = ocfs2_journal_dirty(handle, fe_bh);
 712         if (err < 0) {
 713                 le16_add_cpu(&fe->i_links_count, -1);
 714                 inode->i_nlink--;
 715                 mlog_errno(err);
 716                 goto bail;
 717         }
 718
 719         err = ocfs2_add_entry(handle, dentry, inode,
 720                               OCFS2_I(inode)->ip_blkno,
 721                               parent_fe_bh, de_bh);
 722         if (err) {
 723                 le16_add_cpu(&fe->i_links_count, -1);
 724                 inode->i_nlink--;
 725                 mlog_errno(err);
 726                 goto bail;
 727         }
 728
 729         atomic_inc(&inode->i_count);
 730         dentry->d_op = &ocfs2_dentry_ops;
 731         d_instantiate(dentry, inode);
 732 bail:
 733         if (handle)
 734                 ocfs2_commit_trans(handle);
 735         if (de_bh)
 736                 brelse(de_bh);
 737         if (fe_bh)
 738                 brelse(fe_bh);
 739         if (parent_fe_bh)
 740                 brelse(parent_fe_bh);
 741
 742         mlog_exit(err);
 743
 744         return err;
 745 }
 746
 747 static int ocfs2_unlink(struct inode *dir,
 748                         struct dentry *dentry)
 749 {
 750         int status;
 751         unsigned int saved_nlink = 0;
 752         struct inode *inode = dentry->d_inode;
 753         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 754         u64 blkno;
 755         struct ocfs2_dinode *fe = NULL;
 756         struct buffer_head *fe_bh = NULL;
 757         struct buffer_head *parent_node_bh = NULL;
 758         struct ocfs2_journal_handle *handle = NULL;
 759         struct ocfs2_dir_entry *dirent = NULL;
 760         struct buffer_head *dirent_bh = NULL;
 761         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
 762         struct buffer_head *orphan_entry_bh = NULL;
 763
 764         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 765                    dentry->d_name.len, dentry->d_name.name);
 766
 767         BUG_ON(dentry->d_parent->d_inode != dir);
 768
 769         mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
 770
 771         if (inode == osb->root_inode) {
 772                 mlog(0, "Cannot delete the root directory\n");
 773                 status = -EPERM;
 774                 goto leave;
 775         }
 776
 777         handle = ocfs2_alloc_handle(osb);
 778         if (handle == NULL) {
 779                 status = -ENOMEM;
 780                 mlog_errno(status);
 781                 goto leave;
 782         }
 783
 784         status = ocfs2_meta_lock(dir, handle, &parent_node_bh, 1);
 785         if (status < 0) {
 786                 if (status != -ENOENT)
 787                         mlog_errno(status);
 788                 goto leave;
 789         }
 790
 791         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 792                                           dentry->d_name.len, &blkno,
 793                                           dir, &dirent_bh, &dirent);
 794         if (status < 0) {
 795                 if (status != -ENOENT)
 796                         mlog_errno(status);
 797                 goto leave;
 798         }
 799
 800         if (OCFS2_I(inode)->ip_blkno != blkno) {
 801                 status = -ENOENT;
 802
 803                 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
 804                      (unsigned long long)OCFS2_I(inode)->ip_blkno,
 805                      (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
 806                 goto leave;
 807         }
 808
 809         status = ocfs2_meta_lock(inode, handle, &fe_bh, 1);
 810         if (status < 0) {
 811                 if (status != -ENOENT)
 812                         mlog_errno(status);
 813                 goto leave;
 814         }
 815
 816         if (S_ISDIR(inode->i_mode)) {
 817                 if (!ocfs2_empty_dir(inode)) {
 818                         status = -ENOTEMPTY;
 819                         goto leave;
 820                 } else if (inode->i_nlink != 2) {
 821                         status = -ENOTEMPTY;
 822                         goto leave;
 823                 }
 824         }
 825
 826         /* There are still a few steps left until we can consider the
 827          * unlink to have succeeded. Save off nlink here before
 828          * modification so we can set it back in case we hit an issue
 829          * before commit. */
 830         saved_nlink = inode->i_nlink;
 831         if (S_ISDIR(inode->i_mode))
 832                 inode->i_nlink = 0;
 833         else
 834                 inode->i_nlink--;
 835
 836         status = ocfs2_request_unlink_vote(inode, dentry,
 837                                            (unsigned int) inode->i_nlink);
 838         if (status < 0) {
 839                 /* This vote should succeed under all normal
 840                  * circumstances. */
 841                 mlog_errno(status);
 842                 goto leave;
 843         }
 844
 845         if (!inode->i_nlink) {
 846                 status = ocfs2_prepare_orphan_dir(osb, handle, inode,
 847                                                   orphan_name,
 848                                                   &orphan_entry_bh);
 849                 if (status < 0) {
 850                         mlog_errno(status);
 851                         goto leave;
 852                 }
 853         }
 854
 855         handle = ocfs2_start_trans(osb, handle, OCFS2_UNLINK_CREDITS);
 856         if (IS_ERR(handle)) {
 857                 status = PTR_ERR(handle);
 858                 handle = NULL;
 859                 mlog_errno(status);
 860                 goto leave;
 861         }
 862
 863         status = ocfs2_journal_access(handle, inode, fe_bh,
 864                                       OCFS2_JOURNAL_ACCESS_WRITE);
 865         if (status < 0) {
 866                 mlog_errno(status);
 867                 goto leave;
 868         }
 869
 870         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 871
 872         if (!inode->i_nlink) {
 873                 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
 874                                           orphan_entry_bh);
 875                 if (status < 0) {
 876                         mlog_errno(status);
 877                         goto leave;
 878                 }
 879         }
 880
 881         /* delete the name from the parent dir */
 882         status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
 883         if (status < 0) {
 884                 mlog_errno(status);
 885                 goto leave;
 886         }
 887
 888         /* We can set nlink on the dinode now. clear the saved version
 889          * so that it doesn't get set later. */
 890         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 891         saved_nlink = 0;
 892
 893         status = ocfs2_journal_dirty(handle, fe_bh);
 894         if (status < 0) {
 895                 mlog_errno(status);
 896                 goto leave;
 897         }
 898
 899         if (S_ISDIR(inode->i_mode)) {
 900                 dir->i_nlink--;
 901                 status = ocfs2_mark_inode_dirty(handle, dir,
 902                                                 parent_node_bh);
 903                 if (status < 0) {
 904                         mlog_errno(status);
 905                         dir->i_nlink++;
 906                 }
 907         }
 908
 909 leave:
 910         if (status < 0 && saved_nlink)
 911                 inode->i_nlink = saved_nlink;
 912
 913         if (handle)
 914                 ocfs2_commit_trans(handle);
 915
 916         if (fe_bh)
 917                 brelse(fe_bh);
 918
 919         if (dirent_bh)
 920                 brelse(dirent_bh);
 921
 922         if (parent_node_bh)
 923                 brelse(parent_node_bh);
 924
 925         if (orphan_entry_bh)
 926                 brelse(orphan_entry_bh);
 927
 928         mlog_exit(status);
 929
 930         return status;
 931 }
 932
 933 /*
 934  * The only place this should be used is rename!
 935  * if they have the same id, then the 1st one is the only one locked.
 936  */
 937 static int ocfs2_double_lock(struct ocfs2_super *osb,
 938                              struct ocfs2_journal_handle *handle,
 939                              struct buffer_head **bh1,
 940                              struct inode *inode1,
 941                              struct buffer_head **bh2,
 942                              struct inode *inode2)
 943 {
 944         int status;
 945         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
 946         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
 947         struct buffer_head **tmpbh;
 948         struct inode *tmpinode;
 949
 950         mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
 951                    (unsigned long long)oi1->ip_blkno,
 952                    (unsigned long long)oi2->ip_blkno);
 953
 954         BUG_ON(!handle);
 955
 956         if (*bh1)
 957                 *bh1 = NULL;
 958         if (*bh2)
 959                 *bh2 = NULL;
 960
 961         /* we always want to lock the one with the lower lockid first. */
 962         if (oi1->ip_blkno != oi2->ip_blkno) {
 963                 if (oi1->ip_blkno < oi2->ip_blkno) {
 964                         /* switch id1 and id2 around */
 965                         mlog(0, "switching them around...\n");
 966                         tmpbh = bh2;
 967                         bh2 = bh1;
 968                         bh1 = tmpbh;
 969
 970                         tmpinode = inode2;
 971                         inode2 = inode1;
 972                         inode1 = tmpinode;
 973                 }
 974                 /* lock id2 */
 975                 status = ocfs2_meta_lock(inode2, handle, bh2, 1);
 976                 if (status < 0) {
 977                         if (status != -ENOENT)
 978                                 mlog_errno(status);
 979                         goto bail;
 980                 }
 981         }
 982         /* lock id1 */
 983         status = ocfs2_meta_lock(inode1, handle, bh1, 1);
 984         if (status < 0) {
 985                 if (status != -ENOENT)
 986                         mlog_errno(status);
 987                 goto bail;
 988         }
 989 bail:
 990         mlog_exit(status);
 991         return status;
 992 }
 993
 994 #define PARENT_INO(buffer) \
 995         ((struct ocfs2_dir_entry *) \
 996          ((char *)buffer + \
 997           le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
 998
 999 static int ocfs2_rename(struct inode *old_dir,
1000                         struct dentry *old_dentry,
1001                         struct inode *new_dir,
1002                         struct dentry *new_dentry)
1003 {
1004         int status = 0, rename_lock = 0;
1005         struct inode *old_inode = old_dentry->d_inode;
1006         struct inode *new_inode = new_dentry->d_inode;
1007         struct ocfs2_dinode *newfe = NULL;
1008         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1009         struct buffer_head *orphan_entry_bh = NULL;
1010         struct buffer_head *newfe_bh = NULL;
1011         struct buffer_head *insert_entry_bh = NULL;
1012         struct ocfs2_super *osb = NULL;
1013         u64 newfe_blkno;
1014         struct ocfs2_journal_handle *handle = NULL;
1015         struct buffer_head *old_dir_bh = NULL;
1016         struct buffer_head *new_dir_bh = NULL;
1017         struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry
1018                                                                // and new_dentry
1019         struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
1020         struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
1021                                                     // this is the 1st dirent bh
1022         nlink_t old_dir_nlink = old_dir->i_nlink, new_dir_nlink = new_dir->i_nlink;
1023         unsigned int links_count;
1024
1025         /* At some point it might be nice to break this function up a
1026          * bit. */
1027
1028         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1029                    old_dir, old_dentry, new_dir, new_dentry,
1030                    old_dentry->d_name.len, old_dentry->d_name.name,
1031                    new_dentry->d_name.len, new_dentry->d_name.name);
1032
1033         osb = OCFS2_SB(old_dir->i_sb);
1034
1035         if (new_inode) {
1036                 if (!igrab(new_inode))
1037                         BUG();
1038         }
1039
1040         if (atomic_read(&old_dentry->d_count) > 2) {
1041                 shrink_dcache_parent(old_dentry);
1042                 if (atomic_read(&old_dentry->d_count) > 2) {
1043                         status = -EBUSY;
1044                         goto bail;
1045                 }
1046         }
1047
1048         /* Assume a directory heirarchy thusly:
1049          * a/b/c
1050          * a/d
1051          * a,b,c, and d are all directories.
1052          *
1053          * from cwd of 'a' on both nodes:
1054          * node1: mv b/c d
1055          * node2: mv d   b/c
1056          *
1057          * And that's why, just like the VFS, we need a file system
1058          * rename lock. */
1059         if (old_dentry != new_dentry) {
1060                 status = ocfs2_rename_lock(osb);
1061                 if (status < 0) {
1062                         mlog_errno(status);
1063                         goto bail;
1064                 }
1065                 rename_lock = 1;
1066         }
1067
1068         handle = ocfs2_alloc_handle(osb);
1069         if (handle == NULL) {
1070                 status = -ENOMEM;
1071                 mlog_errno(status);
1072                 goto bail;
1073         }
1074
1075         /* if old and new are the same, this'll just do one lock. */
1076         status = ocfs2_double_lock(osb, handle,
1077                                   &old_dir_bh, old_dir,
1078                                   &new_dir_bh, new_dir);
1079         if (status < 0) {
1080                 mlog_errno(status);
1081                 goto bail;
1082         }
1083
1084         /* make sure both dirs have bhs
1085          * get an extra ref on old_dir_bh if old==new */
1086         if (!new_dir_bh) {
1087                 if (old_dir_bh) {
1088                         new_dir_bh = old_dir_bh;
1089                         get_bh(new_dir_bh);
1090                 } else {
1091                         mlog(ML_ERROR, "no old_dir_bh!\n");
1092                         status = -EIO;
1093                         goto bail;
1094                 }
1095         }
1096
1097         if (S_ISDIR(old_inode->i_mode)) {
1098                 /* Directories actually require metadata updates to
1099                  * the directory info so we can't get away with not
1100                  * doing node locking on it. */
1101                 status = ocfs2_meta_lock(old_inode, handle, NULL, 1);
1102                 if (status < 0) {
1103                         if (status != -ENOENT)
1104                                 mlog_errno(status);
1105                         goto bail;
1106                 }
1107
1108                 status = ocfs2_request_rename_vote(old_inode, old_dentry);
1109                 if (status < 0) {
1110                         mlog_errno(status);
1111                         goto bail;
1112                 }
1113
1114                 status = -EIO;
1115                 old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0);
1116                 if (!old_inode_de_bh)
1117                         goto bail;
1118
1119                 status = -EIO;
1120                 if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) !=
1121                     OCFS2_I(old_dir)->ip_blkno)
1122                         goto bail;
1123                 status = -EMLINK;
1124                 if (!new_inode && new_dir!=old_dir &&
1125                     new_dir->i_nlink >= OCFS2_LINK_MAX)
1126                         goto bail;
1127         } else {
1128                 /* Ah, the simple case - we're a file so just send a
1129                  * message. */
1130                 status = ocfs2_request_rename_vote(old_inode, old_dentry);
1131                 if (status < 0) {
1132                         mlog_errno(status);
1133                         goto bail;
1134                 }
1135         }
1136
1137         status = -ENOENT;
1138         old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1139                                      old_dentry->d_name.len,
1140                                      old_dir, &old_de);
1141         if (!old_de_bh)
1142                 goto bail;
1143
1144         /*
1145          *  Check for inode number is _not_ due to possible IO errors.
1146          *  We might rmdir the source, keep it as pwd of some process
1147          *  and merrily kill the link to whatever was created under the
1148          *  same name. Goodbye sticky bit ;-<
1149          */
1150         if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno)
1151                 goto bail;
1152
1153         /* check if the target already exists (in which case we need
1154          * to delete it */
1155         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1156                                           new_dentry->d_name.len,
1157                                           &newfe_blkno, new_dir, &new_de_bh,
1158                                           &new_de);
1159         /* The only error we allow here is -ENOENT because the new
1160          * file not existing is perfectly valid. */
1161         if ((status < 0) && (status != -ENOENT)) {
1162                 /* If we cannot find the file specified we should just */
1163                 /* return the error... */
1164                 mlog_errno(status);
1165                 goto bail;
1166         }
1167
1168         if (!new_de && new_inode)
1169                 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1170                      "directory!", new_inode->i_ino);
1171
1172         /* In case we need to overwrite an existing file, we blow it
1173          * away first */
1174         if (new_de) {
1175                 /* VFS didn't think there existed an inode here, but
1176                  * someone else in the cluster must have raced our
1177                  * rename to create one. Today we error cleanly, in
1178                  * the future we should consider calling iget to build
1179                  * a new struct inode for this entry. */
1180                 if (!new_inode) {
1181                         status = -EACCES;
1182
1183                         mlog(0, "We found an inode for name %.*s but VFS "
1184                              "didn't give us one.\n", new_dentry->d_name.len,
1185                              new_dentry->d_name.name);
1186                         goto bail;
1187                 }
1188
1189                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1190                         status = -EACCES;
1191
1192                         mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1193                              (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1194                              (unsigned long long)newfe_blkno,
1195                              OCFS2_I(new_inode)->ip_flags);
1196                         goto bail;
1197                 }
1198
1199                 status = ocfs2_meta_lock(new_inode, handle, &newfe_bh, 1);
1200                 if (status < 0) {
1201                         if (status != -ENOENT)
1202                                 mlog_errno(status);
1203                         goto bail;
1204                 }
1205
1206                 if (S_ISDIR(new_inode->i_mode))
1207                         links_count = 0;
1208                 else
1209                         links_count = (unsigned int) (new_inode->i_nlink - 1);
1210
1211                 status = ocfs2_request_unlink_vote(new_inode, new_dentry,
1212                                                    links_count);
1213                 if (status < 0) {
1214                         mlog_errno(status);
1215                         goto bail;
1216                 }
1217
1218                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1219
1220                 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1221                      "newfebh=%p bhblocknr=%llu\n", new_de,
1222                      (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1223                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1224
1225                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1226                         status = ocfs2_prepare_orphan_dir(osb, handle,
1227                                                           new_inode,
1228                                                           orphan_name,
1229                                                           &orphan_entry_bh);
1230                         if (status < 0) {
1231                                 mlog_errno(status);
1232                                 goto bail;
1233                         }
1234                 }
1235         } else {
1236                 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1237
1238                 status = ocfs2_check_dir_for_entry(new_dir,
1239                                                    new_dentry->d_name.name,
1240                                                    new_dentry->d_name.len);
1241                 if (status)
1242                         goto bail;
1243
1244                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1245                                                       new_dentry->d_name.name,
1246                                                       new_dentry->d_name.len,
1247                                                       &insert_entry_bh);
1248                 if (status < 0) {
1249                         mlog_errno(status);
1250                         goto bail;
1251                 }
1252         }
1253
1254         handle = ocfs2_start_trans(osb, handle, OCFS2_RENAME_CREDITS);
1255         if (IS_ERR(handle)) {
1256                 status = PTR_ERR(handle);
1257                 handle = NULL;
1258                 mlog_errno(status);
1259                 goto bail;
1260         }
1261
1262         if (new_de) {
1263                 if (S_ISDIR(new_inode->i_mode)) {
1264                         if (!ocfs2_empty_dir(new_inode) ||
1265                             new_inode->i_nlink != 2) {
1266                                 status = -ENOTEMPTY;
1267                                 goto bail;
1268                         }
1269                 }
1270                 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1271                                               OCFS2_JOURNAL_ACCESS_WRITE);
1272                 if (status < 0) {
1273                         mlog_errno(status);
1274                         goto bail;
1275                 }
1276
1277                 if (S_ISDIR(new_inode->i_mode) ||
1278                     (newfe->i_links_count == cpu_to_le16(1))){
1279                         status = ocfs2_orphan_add(osb, handle, new_inode,
1280                                                   newfe, orphan_name,
1281                                                   orphan_entry_bh);
1282                         if (status < 0) {
1283                                 mlog_errno(status);
1284                                 goto bail;
1285                         }
1286                 }
1287
1288                 /* change the dirent to point to the correct inode */
1289                 status = ocfs2_journal_access(handle, new_dir, new_de_bh,
1290                                               OCFS2_JOURNAL_ACCESS_WRITE);
1291                 if (status < 0) {
1292                         mlog_errno(status);
1293                         goto bail;
1294                 }
1295                 new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno);
1296                 new_de->file_type = old_de->file_type;
1297                 new_dir->i_version++;
1298                 status = ocfs2_journal_dirty(handle, new_de_bh);
1299                 if (status < 0) {
1300                         mlog_errno(status);
1301                         goto bail;
1302                 }
1303
1304                 if (S_ISDIR(new_inode->i_mode))
1305                         newfe->i_links_count = 0;
1306                 else
1307                         le16_add_cpu(&newfe->i_links_count, -1);
1308
1309                 status = ocfs2_journal_dirty(handle, newfe_bh);
1310                 if (status < 0) {
1311                         mlog_errno(status);
1312                         goto bail;
1313                 }
1314         } else {
1315                 /* if the name was not found in new_dir, add it now */
1316                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1317                                          OCFS2_I(old_inode)->ip_blkno,
1318                                          new_dir_bh, insert_entry_bh);
1319         }
1320
1321         old_inode->i_ctime = CURRENT_TIME;
1322         mark_inode_dirty(old_inode);
1323
1324         /* now that the name has been added to new_dir, remove the old name */
1325         status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1326         if (status < 0) {
1327                 mlog_errno(status);
1328                 goto bail;
1329         }
1330
1331         if (new_inode) {
1332                 new_inode->i_nlink--;
1333                 new_inode->i_ctime = CURRENT_TIME;
1334         }
1335         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1336         if (old_inode_de_bh) {
1337                 status = ocfs2_journal_access(handle, old_inode,
1338                                              old_inode_de_bh,
1339                                              OCFS2_JOURNAL_ACCESS_WRITE);
1340                 PARENT_INO(old_inode_de_bh->b_data) =
1341                         cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
1342                 status = ocfs2_journal_dirty(handle, old_inode_de_bh);
1343                 old_dir->i_nlink--;
1344                 if (new_inode) {
1345                         new_inode->i_nlink--;
1346                 } else {
1347                         new_dir->i_nlink++;
1348                         mark_inode_dirty(new_dir);
1349                 }
1350         }
1351         mark_inode_dirty(old_dir);
1352         if (new_inode)
1353                 mark_inode_dirty(new_inode);
1354
1355         if (old_dir != new_dir)
1356                 if (new_dir_nlink != new_dir->i_nlink) {
1357                         if (!new_dir_bh) {
1358                                 mlog(ML_ERROR, "need to change nlink for new "
1359                                      "dir %llu from %d to %d but bh is NULL\n",
1360                                      (unsigned long long)OCFS2_I(new_dir)->ip_blkno,
1361                                      (int)new_dir_nlink, new_dir->i_nlink);
1362                         } else {
1363                                 struct ocfs2_dinode *fe;
1364                                 status = ocfs2_journal_access(handle,
1365                                                               new_dir,
1366                                                               new_dir_bh,
1367                                                               OCFS2_JOURNAL_ACCESS_WRITE);
1368                                 fe = (struct ocfs2_dinode *) new_dir_bh->b_data;
1369                                 fe->i_links_count = cpu_to_le16(new_dir->i_nlink);
1370                                 status = ocfs2_journal_dirty(handle, new_dir_bh);
1371                         }
1372                 }
1373
1374         if (old_dir_nlink != old_dir->i_nlink) {
1375                 if (!old_dir_bh) {
1376                         mlog(ML_ERROR, "need to change nlink for old dir "
1377                              "%llu from %d to %d but bh is NULL!\n",
1378                              (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1379                              (int)old_dir_nlink, old_dir->i_nlink);
1380                 } else {
1381                         struct ocfs2_dinode *fe;
1382                         status = ocfs2_journal_access(handle, old_dir,
1383                                                       old_dir_bh,
1384                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1385                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1386                         fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1387                         status = ocfs2_journal_dirty(handle, old_dir_bh);
1388                 }
1389         }
1390
1391         status = 0;
1392 bail:
1393         if (rename_lock)
1394                 ocfs2_rename_unlock(osb);
1395
1396         if (handle)
1397                 ocfs2_commit_trans(handle);
1398
1399         if (new_inode)
1400                 sync_mapping_buffers(old_inode->i_mapping);
1401
1402         if (new_inode)
1403                 iput(new_inode);
1404         if (newfe_bh)
1405                 brelse(newfe_bh);
1406         if (old_dir_bh)
1407                 brelse(old_dir_bh);
1408         if (new_dir_bh)
1409                 brelse(new_dir_bh);
1410         if (new_de_bh)
1411                 brelse(new_de_bh);
1412         if (old_de_bh)
1413                 brelse(old_de_bh);
1414         if (old_inode_de_bh)
1415                 brelse(old_inode_de_bh);
1416         if (orphan_entry_bh)
1417                 brelse(orphan_entry_bh);
1418         if (insert_entry_bh)
1419                 brelse(insert_entry_bh);
1420
1421         mlog_exit(status);
1422
1423         return status;
1424 }
1425
1426 /*
1427  * we expect i_size = strlen(symname). Copy symname into the file
1428  * data, including the null terminator.
1429  */
1430 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1431                                      struct ocfs2_journal_handle *handle,
1432                                      struct inode *inode,
1433                                      const char *symname)
1434 {
1435         struct buffer_head **bhs = NULL;
1436         const char *c;
1437         struct super_block *sb = osb->sb;
1438         u64 p_blkno;
1439         int p_blocks;
1440         int virtual, blocks, status, i, bytes_left;
1441
1442         bytes_left = i_size_read(inode) + 1;
1443         /* we can't trust i_blocks because we're actually going to
1444          * write i_size + 1 bytes. */
1445         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1446
1447         mlog_entry("i_blocks = %lu, i_size = %llu, blocks = %d\n",
1448                        inode->i_blocks, i_size_read(inode), blocks);
1449
1450         /* Sanity check -- make sure we're going to fit. */
1451         if (bytes_left >
1452             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1453                 status = -EIO;
1454                 mlog_errno(status);
1455                 goto bail;
1456         }
1457
1458         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1459         if (!bhs) {
1460                 status = -ENOMEM;
1461                 mlog_errno(status);
1462                 goto bail;
1463         }
1464
1465         status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno,
1466                                              &p_blocks);
1467         if (status < 0) {
1468                 mlog_errno(status);
1469                 goto bail;
1470         }
1471
1472         /* links can never be larger than one cluster so we know this
1473          * is all going to be contiguous, but do a sanity check
1474          * anyway. */
1475         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1476                 status = -EIO;
1477                 mlog_errno(status);
1478                 goto bail;
1479         }
1480
1481         virtual = 0;
1482         while(bytes_left > 0) {
1483                 c = &symname[virtual * sb->s_blocksize];
1484
1485                 bhs[virtual] = sb_getblk(sb, p_blkno);
1486                 if (!bhs[virtual]) {
1487                         status = -ENOMEM;
1488                         mlog_errno(status);
1489                         goto bail;
1490                 }
1491                 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1492
1493                 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1494                                               OCFS2_JOURNAL_ACCESS_CREATE);
1495                 if (status < 0) {
1496                         mlog_errno(status);
1497                         goto bail;
1498                 }
1499
1500                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1501
1502                 memcpy(bhs[virtual]->b_data, c,
1503                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1504                        bytes_left);
1505
1506                 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1507                 if (status < 0) {
1508                         mlog_errno(status);
1509                         goto bail;
1510                 }
1511
1512                 virtual++;
1513                 p_blkno++;
1514                 bytes_left -= sb->s_blocksize;
1515         }
1516
1517         status = 0;
1518 bail:
1519
1520         if (bhs) {
1521                 for(i = 0; i < blocks; i++)
1522                         if (bhs[i])
1523                                 brelse(bhs[i]);
1524                 kfree(bhs);
1525         }
1526
1527         mlog_exit(status);
1528         return status;
1529 }
1530
1531 static int ocfs2_symlink(struct inode *dir,
1532                          struct dentry *dentry,
1533                          const char *symname)
1534 {
1535         int status, l, credits;
1536         u64 newsize;
1537         struct ocfs2_super *osb = NULL;
1538         struct inode *inode = NULL;
1539         struct super_block *sb;
1540         struct buffer_head *new_fe_bh = NULL;
1541         struct buffer_head *de_bh = NULL;
1542         struct buffer_head *parent_fe_bh = NULL;
1543         struct ocfs2_dinode *fe = NULL;
1544         struct ocfs2_dinode *dirfe;
1545         struct ocfs2_journal_handle *handle = NULL;
1546         struct ocfs2_alloc_context *inode_ac = NULL;
1547         struct ocfs2_alloc_context *data_ac = NULL;
1548
1549         mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1550                    dentry, symname, dentry->d_name.len, dentry->d_name.name);
1551
1552         sb = dir->i_sb;
1553         osb = OCFS2_SB(sb);
1554
1555         l = strlen(symname) + 1;
1556
1557         credits = ocfs2_calc_symlink_credits(sb);
1558
1559         handle = ocfs2_alloc_handle(osb);
1560         if (handle == NULL) {
1561                 status = -ENOMEM;
1562                 mlog_errno(status);
1563                 goto bail;
1564         }
1565
1566         /* lock the parent directory */
1567         status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
1568         if (status < 0) {
1569                 if (status != -ENOENT)
1570                         mlog_errno(status);
1571                 goto bail;
1572         }
1573
1574         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1575         if (!dirfe->i_links_count) {
1576                 /* can't make a file in a deleted directory. */
1577                 status = -ENOENT;
1578                 goto bail;
1579         }
1580
1581         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1582                                            dentry->d_name.len);
1583         if (status)
1584                 goto bail;
1585
1586         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1587                                               dentry->d_name.name,
1588                                               dentry->d_name.len, &de_bh);
1589         if (status < 0) {
1590                 mlog_errno(status);
1591                 goto bail;
1592         }
1593
1594         status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
1595         if (status < 0) {
1596                 if (status != -ENOSPC)
1597                         mlog_errno(status);
1598                 goto bail;
1599         }
1600
1601         /* don't reserve bitmap space for fast symlinks. */
1602         if (l > ocfs2_fast_symlink_chars(sb)) {
1603                 status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
1604                 if (status < 0) {
1605                         if (status != -ENOSPC)
1606                                 mlog_errno(status);
1607                         goto bail;
1608                 }
1609         }
1610
1611         handle = ocfs2_start_trans(osb, handle, credits);
1612         if (IS_ERR(handle)) {
1613                 status = PTR_ERR(handle);
1614                 handle = NULL;
1615                 mlog_errno(status);
1616                 goto bail;
1617         }
1618
1619         status = ocfs2_mknod_locked(osb, dir, dentry,
1620                                     S_IFLNK | S_IRWXUGO, 0,
1621                                     &new_fe_bh, parent_fe_bh, handle,
1622                                     &inode, inode_ac);
1623         if (status < 0) {
1624                 mlog_errno(status);
1625                 goto bail;
1626         }
1627
1628         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1629         inode->i_rdev = 0;
1630         newsize = l - 1;
1631         if (l > ocfs2_fast_symlink_chars(sb)) {
1632                 inode->i_op = &ocfs2_symlink_inode_operations;
1633                 status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh,
1634                                                     handle, data_ac, NULL,
1635                                                     NULL);
1636                 if (status < 0) {
1637                         if (status != -ENOSPC && status != -EINTR) {
1638                                 mlog(ML_ERROR,
1639                                      "Failed to extend file to %llu\n",
1640                                      (unsigned long long)newsize);
1641                                 mlog_errno(status);
1642                                 status = -ENOSPC;
1643                         }
1644                         goto bail;
1645                 }
1646                 i_size_write(inode, newsize);
1647                 inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize);
1648         } else {
1649                 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1650                 memcpy((char *) fe->id2.i_symlink, symname, l);
1651                 i_size_write(inode, newsize);
1652                 inode->i_blocks = 0;
1653         }
1654
1655         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1656         if (status < 0) {
1657                 mlog_errno(status);
1658                 goto bail;
1659         }
1660
1661         if (!ocfs2_inode_is_fast_symlink(inode)) {
1662                 status = ocfs2_create_symlink_data(osb, handle, inode,
1663                                                    symname);
1664                 if (status < 0) {
1665                         mlog_errno(status);
1666                         goto bail;
1667                 }
1668         }
1669
1670         status = ocfs2_add_entry(handle, dentry, inode,
1671                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
1672                                  de_bh);
1673         if (status < 0) {
1674                 mlog_errno(status);
1675                 goto bail;
1676         }
1677
1678         insert_inode_hash(inode);
1679         dentry->d_op = &ocfs2_dentry_ops;
1680         d_instantiate(dentry, inode);
1681 bail:
1682         if (handle)
1683                 ocfs2_commit_trans(handle);
1684         if (new_fe_bh)
1685                 brelse(new_fe_bh);
1686         if (parent_fe_bh)
1687                 brelse(parent_fe_bh);
1688         if (de_bh)
1689                 brelse(de_bh);
1690         if (inode_ac)
1691                 ocfs2_free_alloc_context(inode_ac);
1692         if (data_ac)
1693                 ocfs2_free_alloc_context(data_ac);
1694         if ((status < 0) && inode)
1695                 iput(inode);
1696
1697         mlog_exit(status);
1698
1699         return status;
1700 }
1701
1702 int ocfs2_check_dir_entry(struct inode * dir,
1703                           struct ocfs2_dir_entry * de,
1704                           struct buffer_head * bh,
1705                           unsigned long offset)
1706 {
1707         const char *error_msg = NULL;
1708         const int rlen = le16_to_cpu(de->rec_len);
1709
1710         if (rlen < OCFS2_DIR_REC_LEN(1))
1711                 error_msg = "rec_len is smaller than minimal";
1712         else if (rlen % 4 != 0)
1713                 error_msg = "rec_len % 4 != 0";
1714         else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
1715                 error_msg = "rec_len is too small for name_len";
1716         else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
1717                 error_msg = "directory entry across blocks";
1718
1719         if (error_msg != NULL)
1720                 mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
1721                      "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
1722                      (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
1723                      offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
1724                      de->name_len);
1725         return error_msg == NULL ? 1 : 0;
1726 }
1727
1728 /* we don't always have a dentry for what we want to add, so people
1729  * like orphan dir can call this instead.
1730  *
1731  * If you pass me insert_bh, I'll skip the search of the other dir
1732  * blocks and put the record in there.
1733  */
1734 static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle,
1735                              struct inode *dir,
1736                              const char *name, int namelen,
1737                              struct inode *inode, u64 blkno,
1738                              struct buffer_head *parent_fe_bh,
1739                              struct buffer_head *insert_bh)
1740 {
1741         unsigned long offset;
1742         unsigned short rec_len;
1743         struct ocfs2_dir_entry *de, *de1;
1744         struct super_block *sb;
1745         int retval, status;
1746
1747         mlog_entry_void();
1748
1749         sb = dir->i_sb;
1750
1751         if (!namelen)
1752                 return -EINVAL;
1753
1754         rec_len = OCFS2_DIR_REC_LEN(namelen);
1755         offset = 0;
1756         de = (struct ocfs2_dir_entry *) insert_bh->b_data;
1757         while (1) {
1758                 BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data);
1759                 /* These checks should've already been passed by the
1760                  * prepare function, but I guess we can leave them
1761                  * here anyway. */
1762                 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
1763                         retval = -ENOENT;
1764                         goto bail;
1765                 }
1766                 if (ocfs2_match(namelen, name, de)) {
1767                         retval = -EEXIST;
1768                         goto bail;
1769                 }
1770                 if (((le64_to_cpu(de->inode) == 0) &&
1771                      (le16_to_cpu(de->rec_len) >= rec_len)) ||
1772                     (le16_to_cpu(de->rec_len) >=
1773                      (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
1774                         status = ocfs2_journal_access(handle, dir, insert_bh,
1775                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1776                         /* By now the buffer is marked for journaling */
1777                         offset += le16_to_cpu(de->rec_len);
1778                         if (le64_to_cpu(de->inode)) {
1779                                 de1 = (struct ocfs2_dir_entry *)((char *) de +
1780                                         OCFS2_DIR_REC_LEN(de->name_len));
1781                                 de1->rec_len =
1782                                         cpu_to_le16(le16_to_cpu(de->rec_len) -
1783                                         OCFS2_DIR_REC_LEN(de->name_len));
1784                                 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1785                                 de = de1;
1786                         }
1787                         de->file_type = OCFS2_FT_UNKNOWN;
1788                         if (blkno) {
1789                                 de->inode = cpu_to_le64(blkno);
1790                                 ocfs2_set_de_type(de, inode->i_mode);
1791                         } else
1792                                 de->inode = 0;
1793                         de->name_len = namelen;
1794                         memcpy(de->name, name, namelen);
1795
1796                         dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1797                         dir->i_version++;
1798                         status = ocfs2_journal_dirty(handle, insert_bh);
1799                         retval = 0;
1800                         goto bail;
1801                 }
1802                 offset += le16_to_cpu(de->rec_len);
1803                 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
1804         }
1805
1806         /* when you think about it, the assert above should prevent us
1807          * from ever getting here. */
1808         retval = -ENOSPC;
1809 bail:
1810
1811         mlog_exit(retval);
1812         return retval;
1813 }
1814
1815
1816 /*
1817  * ocfs2_delete_entry deletes a directory entry by merging it with the
1818  * previous entry
1819  */
1820 static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle,
1821                               struct inode *dir,
1822                               struct ocfs2_dir_entry *de_del,
1823                               struct buffer_head *bh)
1824 {
1825         struct ocfs2_dir_entry *de, *pde;
1826         int i, status = -ENOENT;
1827
1828         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
1829
1830         i = 0;
1831         pde = NULL;
1832         de = (struct ocfs2_dir_entry *) bh->b_data;
1833         while (i < bh->b_size) {
1834                 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
1835                         status = -EIO;
1836                         mlog_errno(status);
1837                         goto bail;
1838                 }
1839                 if (de == de_del)  {
1840                         status = ocfs2_journal_access(handle, dir, bh,
1841                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1842                         if (status < 0) {
1843                                 status = -EIO;
1844                                 mlog_errno(status);
1845                                 goto bail;
1846                         }
1847                         if (pde)
1848                                 pde->rec_len =
1849                                         cpu_to_le16(le16_to_cpu(pde->rec_len) +
1850                                                     le16_to_cpu(de->rec_len));
1851                         else
1852                                 de->inode = 0;
1853                         dir->i_version++;
1854                         status = ocfs2_journal_dirty(handle, bh);
1855                         goto bail;
1856                 }
1857                 i += le16_to_cpu(de->rec_len);
1858                 pde = de;
1859                 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
1860         }
1861 bail:
1862         mlog_exit(status);
1863         return status;
1864 }
1865
1866 /*
1867  * Returns 0 if not found, -1 on failure, and 1 on success
1868  */
1869 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
1870                                         struct inode *dir,
1871                                         const char *name, int namelen,
1872                                         unsigned long offset,
1873                                         struct ocfs2_dir_entry **res_dir)
1874 {
1875         struct ocfs2_dir_entry *de;
1876         char *dlimit, *de_buf;
1877         int de_len;
1878         int ret = 0;
1879
1880         mlog_entry_void();
1881
1882         de_buf = bh->b_data;
1883         dlimit = de_buf + dir->i_sb->s_blocksize;
1884
1885         while (de_buf < dlimit) {
1886                 /* this code is executed quadratically often */
1887                 /* do minimal checking `by hand' */
1888
1889                 de = (struct ocfs2_dir_entry *) de_buf;
1890
1891                 if (de_buf + namelen <= dlimit &&
1892                     ocfs2_match(namelen, name, de)) {
1893                         /* found a match - just to be sure, do a full check */
1894                         if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
1895                                 ret = -1;
1896                                 goto bail;
1897                         }
1898                         *res_dir = de;
1899                         ret = 1;
1900                         goto bail;
1901                 }
1902
1903                 /* prevent looping on a bad block */
1904                 de_len = le16_to_cpu(de->rec_len);
1905                 if (de_len <= 0) {
1906                         ret = -1;
1907                         goto bail;
1908                 }
1909
1910                 de_buf += de_len;
1911                 offset += de_len;
1912         }
1913
1914 bail:
1915         mlog_exit(ret);
1916         return ret;
1917 }
1918
1919 struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
1920                                      struct inode *dir,
1921                                      struct ocfs2_dir_entry **res_dir)
1922 {
1923         struct super_block *sb;
1924         struct buffer_head *bh_use[NAMEI_RA_SIZE];
1925         struct buffer_head *bh, *ret = NULL;
1926         unsigned long start, block, b;
1927         int ra_max = 0;         /* Number of bh's in the readahead
1928                                    buffer, bh_use[] */
1929         int ra_ptr = 0;         /* Current index into readahead
1930                                    buffer */
1931         int num = 0;
1932         int nblocks, i, err;
1933
1934         mlog_entry_void();
1935
1936         *res_dir = NULL;
1937         sb = dir->i_sb;
1938
1939         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
1940         start = OCFS2_I(dir)->ip_dir_start_lookup;
1941         if (start >= nblocks)
1942                 start = 0;
1943         block = start;
1944
1945 restart:
1946         do {
1947                 /*
1948                  * We deal with the read-ahead logic here.
1949                  */
1950                 if (ra_ptr >= ra_max) {
1951                         /* Refill the readahead buffer */
1952                         ra_ptr = 0;
1953                         b = block;
1954                         for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
1955                                 /*
1956                                  * Terminate if we reach the end of the
1957                                  * directory and must wrap, or if our
1958                                  * search has finished at this block.
1959                                  */
1960                                 if (b >= nblocks || (num && block == start)) {
1961                                         bh_use[ra_max] = NULL;
1962                                         break;
1963                                 }
1964                                 num++;
1965
1966                                 /* XXX: questionable readahead stuff here */
1967                                 bh = ocfs2_bread(dir, b++, &err, 1);
1968                                 bh_use[ra_max] = bh;
1969 #if 0           // ???
1970                                 if (bh)
1971                                         ll_rw_block(READ, 1, &bh);
1972 #endif
1973                         }
1974                 }
1975                 if ((bh = bh_use[ra_ptr++]) == NULL)
1976                         goto next;
1977                 wait_on_buffer(bh);
1978                 if (!buffer_uptodate(bh)) {
1979                         /* read error, skip block & hope for the best */
1980                         brelse(bh);
1981                         goto next;
1982                 }
1983                 i = ocfs2_search_dirblock(bh, dir, name, namelen,
1984                                           block << sb->s_blocksize_bits,
1985                                           res_dir);
1986                 if (i == 1) {
1987                         OCFS2_I(dir)->ip_dir_start_lookup = block;
1988                         ret = bh;
1989                         goto cleanup_and_exit;
1990                 } else {
1991                         brelse(bh);
1992                         if (i < 0)
1993                                 goto cleanup_and_exit;
1994                 }
1995         next:
1996                 if (++block >= nblocks)
1997                         block = 0;
1998         } while (block != start);
1999
2000         /*
2001          * If the directory has grown while we were searching, then
2002          * search the last part of the directory before giving up.
2003          */
2004         block = nblocks;
2005         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2006         if (block < nblocks) {
2007                 start = 0;
2008                 goto restart;
2009         }
2010
2011 cleanup_and_exit:
2012         /* Clean up the read-ahead blocks */
2013         for (; ra_ptr < ra_max; ra_ptr++)
2014                 brelse(bh_use[ra_ptr]);
2015
2016         mlog_exit_ptr(ret);
2017         return ret;
2018 }
2019
2020 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2021 {
2022         int status, namelen;
2023
2024         mlog_entry_void();
2025
2026         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
2027                            (long long)blkno);
2028         if (namelen <= 0) {
2029                 if (namelen)
2030                         status = namelen;
2031                 else
2032                         status = -EINVAL;
2033                 mlog_errno(status);
2034                 goto bail;
2035         }
2036         if (namelen != OCFS2_ORPHAN_NAMELEN) {
2037                 status = -EINVAL;
2038                 mlog_errno(status);
2039                 goto bail;
2040         }
2041
2042         mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
2043              namelen);
2044
2045         status = 0;
2046 bail:
2047         mlog_exit(status);
2048         return status;
2049 }
2050
2051 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2052                                     struct ocfs2_journal_handle *handle,
2053                                     struct inode *inode,
2054                                     char *name,
2055                                     struct buffer_head **de_bh)
2056 {
2057         struct inode *orphan_dir_inode = NULL;
2058         struct buffer_head *orphan_dir_bh = NULL;
2059         int status = 0;
2060
2061         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2062         if (status < 0) {
2063                 mlog_errno(status);
2064                 goto leave;
2065         }
2066
2067         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2068                                                        ORPHAN_DIR_SYSTEM_INODE,
2069                                                        osb->slot_num);
2070         if (!orphan_dir_inode) {
2071                 status = -ENOENT;
2072                 mlog_errno(status);
2073                 goto leave;
2074         }
2075
2076         ocfs2_handle_add_inode(handle, orphan_dir_inode);
2077         status = ocfs2_meta_lock(orphan_dir_inode, handle, &orphan_dir_bh, 1);
2078         if (status < 0) {
2079                 mlog_errno(status);
2080                 goto leave;
2081         }
2082
2083         status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2084                                               orphan_dir_bh, name,
2085                                               OCFS2_ORPHAN_NAMELEN, de_bh);
2086         if (status < 0) {
2087                 mlog_errno(status);
2088                 goto leave;
2089         }
2090
2091 leave:
2092         if (orphan_dir_inode)
2093                 iput(orphan_dir_inode);
2094
2095         if (orphan_dir_bh)
2096                 brelse(orphan_dir_bh);
2097
2098         mlog_exit(status);
2099         return status;
2100 }
2101
2102 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2103                             struct ocfs2_journal_handle *handle,
2104                             struct inode *inode,
2105                             struct ocfs2_dinode *fe,
2106                             char *name,
2107                             struct buffer_head *de_bh)
2108 {
2109         struct inode *orphan_dir_inode = NULL;
2110         struct buffer_head *orphan_dir_bh = NULL;
2111         int status = 0;
2112         struct ocfs2_dinode *orphan_fe;
2113
2114         mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
2115
2116         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2117                                                        ORPHAN_DIR_SYSTEM_INODE,
2118                                                        osb->slot_num);
2119         if (!orphan_dir_inode) {
2120                 status = -ENOENT;
2121                 mlog_errno(status);
2122                 goto leave;
2123         }
2124
2125         status = ocfs2_read_block(osb,
2126                                   OCFS2_I(orphan_dir_inode)->ip_blkno,
2127                                   &orphan_dir_bh, OCFS2_BH_CACHED,
2128                                   orphan_dir_inode);
2129         if (status < 0) {
2130                 mlog_errno(status);
2131                 goto leave;
2132         }
2133
2134         status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
2135                                       OCFS2_JOURNAL_ACCESS_WRITE);
2136         if (status < 0) {
2137                 mlog_errno(status);
2138                 goto leave;
2139         }
2140
2141         /* we're a cluster, and nlink can change on disk from
2142          * underneath us... */
2143         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2144         if (S_ISDIR(inode->i_mode))
2145                 le16_add_cpu(&orphan_fe->i_links_count, 1);
2146         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2147
2148         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2149         if (status < 0) {
2150                 mlog_errno(status);
2151                 goto leave;
2152         }
2153
2154         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2155                                    OCFS2_ORPHAN_NAMELEN, inode,
2156                                    OCFS2_I(inode)->ip_blkno,
2157                                    orphan_dir_bh, de_bh);
2158         if (status < 0) {
2159                 mlog_errno(status);
2160                 goto leave;
2161         }
2162
2163         le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2164
2165         /* Record which orphan dir our inode now resides
2166          * in. delete_inode will use this to determine which orphan
2167          * dir to lock. */
2168         spin_lock(&OCFS2_I(inode)->ip_lock);
2169         OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num;
2170         spin_unlock(&OCFS2_I(inode)->ip_lock);
2171
2172         mlog(0, "Inode %llu orphaned in slot %d\n",
2173              (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
2174
2175 leave:
2176         if (orphan_dir_inode)
2177                 iput(orphan_dir_inode);
2178
2179         if (orphan_dir_bh)
2180                 brelse(orphan_dir_bh);
2181
2182         mlog_exit(status);
2183         return status;
2184 }
2185
2186 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2187 int ocfs2_orphan_del(struct ocfs2_super *osb,
2188                      struct ocfs2_journal_handle *handle,
2189                      struct inode *orphan_dir_inode,
2190                      struct inode *inode,
2191                      struct buffer_head *orphan_dir_bh)
2192 {
2193         char name[OCFS2_ORPHAN_NAMELEN + 1];
2194         struct ocfs2_dinode *orphan_fe;
2195         int status = 0;
2196         struct buffer_head *target_de_bh = NULL;
2197         struct ocfs2_dir_entry *target_de = NULL;
2198
2199         mlog_entry_void();
2200
2201         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2202         if (status < 0) {
2203                 mlog_errno(status);
2204                 goto leave;
2205         }
2206
2207         mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
2208              name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2209              OCFS2_ORPHAN_NAMELEN);
2210
2211         /* find it's spot in the orphan directory */
2212         target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
2213                                         orphan_dir_inode, &target_de);
2214         if (!target_de_bh) {
2215                 status = -ENOENT;
2216                 mlog_errno(status);
2217                 goto leave;
2218         }
2219
2220         /* remove it from the orphan directory */
2221         status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
2222                                     target_de_bh);
2223         if (status < 0) {
2224                 mlog_errno(status);
2225                 goto leave;
2226         }
2227
2228         status = ocfs2_journal_access(handle,orphan_dir_inode,  orphan_dir_bh,
2229                                       OCFS2_JOURNAL_ACCESS_WRITE);
2230         if (status < 0) {
2231                 mlog_errno(status);
2232                 goto leave;
2233         }
2234
2235         /* do the i_nlink dance! :) */
2236         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2237         if (S_ISDIR(inode->i_mode))
2238                 le16_add_cpu(&orphan_fe->i_links_count, -1);
2239         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2240
2241         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2242         if (status < 0) {
2243                 mlog_errno(status);
2244                 goto leave;
2245         }
2246
2247 leave:
2248         if (target_de_bh)
2249                 brelse(target_de_bh);
2250
2251         mlog_exit(status);
2252         return status;
2253 }
2254
2255 struct inode_operations ocfs2_dir_iops = {
2256         .create         = ocfs2_create,
2257         .lookup         = ocfs2_lookup,
2258         .link           = ocfs2_link,
2259         .unlink         = ocfs2_unlink,
2260         .rmdir          = ocfs2_unlink,
2261         .symlink        = ocfs2_symlink,
2262         .mkdir          = ocfs2_mkdir,
2263         .mknod          = ocfs2_mknod,
2264         .rename         = ocfs2_rename,
2265         .setattr        = ocfs2_setattr,
2266         .getattr        = ocfs2_getattr,
2267 };