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   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * namei.c
   5  *
   6  * Create and rename file, directory, symlinks
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  *  Portions of this code from linux/fs/ext3/dir.c
  11  *
  12  *  Copyright (C) 1992, 1993, 1994, 1995
  13  *  Remy Card (card@masi.ibp.fr)
  14  *  Laboratoire MASI - Institut Blaise pascal
  15  *  Universite Pierre et Marie Curie (Paris VI)
  16  *
  17  *   from
  18  *
  19  *   linux/fs/minix/dir.c
  20  *
  21  *   Copyright (C) 1991, 1992 Linux Torvalds
  22  *
  23  * This program is free software; you can redistribute it and/or
  24  * modify it under the terms of the GNU General Public
  25  * License as published by the Free Software Foundation; either
  26  * version 2 of the License, or (at your option) any later version.
  27  *
  28  * This program is distributed in the hope that it will be useful,
  29  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  30  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  31  * General Public License for more details.
  32  *
  33  * You should have received a copy of the GNU General Public
  34  * License along with this program; if not, write to the
  35  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  36  * Boston, MA 021110-1307, USA.
  37  */
  38
  39 #include <linux/fs.h>
  40 #include <linux/types.h>
  41 #include <linux/slab.h>
  42 #include <linux/highmem.h>
  43
  44 #define MLOG_MASK_PREFIX ML_NAMEI
  45 #include <cluster/masklog.h>
  46
  47 #include "ocfs2.h"
  48
  49 #include "alloc.h"
  50 #include "dcache.h"
  51 #include "dir.h"
  52 #include "dlmglue.h"
  53 #include "extent_map.h"
  54 #include "file.h"
  55 #include "inode.h"
  56 #include "journal.h"
  57 #include "namei.h"
  58 #include "suballoc.h"
  59 #include "super.h"
  60 #include "symlink.h"
  61 #include "sysfile.h"
  62 #include "uptodate.h"
  63 #include "vote.h"
  64
  65 #include "buffer_head_io.h"
  66
  67 #define NAMEI_RA_CHUNKS  2
  68 #define NAMEI_RA_BLOCKS  4
  69 #define NAMEI_RA_SIZE        (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
  70 #define NAMEI_RA_INDEX(c,b)  (((c) * NAMEI_RA_BLOCKS) + (b))
  71
  72 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
  73                                         struct inode *dir,
  74                                         const char *name, int namelen,
  75                                         unsigned long offset,
  76                                         struct ocfs2_dir_entry **res_dir);
  77
  78 static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle,
  79                               struct inode *dir,
  80                               struct ocfs2_dir_entry *de_del,
  81                               struct buffer_head *bh);
  82
  83 static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle,
  84                              struct inode *dir,
  85                              const char *name, int namelen,
  86                              struct inode *inode, u64 blkno,
  87                              struct buffer_head *parent_fe_bh,
  88                              struct buffer_head *insert_bh);
  89
  90 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
  91                               struct inode *dir,
  92                               struct dentry *dentry, int mode,
  93                               dev_t dev,
  94                               struct buffer_head **new_fe_bh,
  95                               struct buffer_head *parent_fe_bh,
  96                               struct ocfs2_journal_handle *handle,
  97                               struct inode **ret_inode,
  98                               struct ocfs2_alloc_context *inode_ac);
  99
 100 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
 101                               struct ocfs2_journal_handle *handle,
 102                               struct inode *parent,
 103                               struct inode *inode,
 104                               struct buffer_head *fe_bh,
 105                               struct ocfs2_alloc_context *data_ac);
 106
 107 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
 108                                     struct inode **ret_orphan_dir,
 109                                     struct inode *inode,
 110                                     char *name,
 111                                     struct buffer_head **de_bh);
 112
 113 static int ocfs2_orphan_add(struct ocfs2_super *osb,
 114                             struct ocfs2_journal_handle *handle,
 115                             struct inode *inode,
 116                             struct ocfs2_dinode *fe,
 117                             char *name,
 118                             struct buffer_head *de_bh,
 119                             struct inode *orphan_dir_inode);
 120
 121 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
 122                                      struct ocfs2_journal_handle *handle,
 123                                      struct inode *inode,
 124                                      const char *symname);
 125
 126 static inline int ocfs2_add_entry(struct ocfs2_journal_handle *handle,
 127                                   struct dentry *dentry,
 128                                   struct inode *inode, u64 blkno,
 129                                   struct buffer_head *parent_fe_bh,
 130                                   struct buffer_head *insert_bh)
 131 {
 132         return __ocfs2_add_entry(handle, dentry->d_parent->d_inode,
 133                                  dentry->d_name.name, dentry->d_name.len,
 134                                  inode, blkno, parent_fe_bh, insert_bh);
 135 }
 136
 137 /* An orphan dir name is an 8 byte value, printed as a hex string */
 138 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
 139
 140 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
 141                                    struct nameidata *nd)
 142 {
 143         int status;
 144         u64 blkno;
 145         struct buffer_head *dirent_bh = NULL;
 146         struct inode *inode = NULL;
 147         struct dentry *ret;
 148         struct ocfs2_dir_entry *dirent;
 149         struct ocfs2_inode_info *oi;
 150
 151         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 152                    dentry->d_name.len, dentry->d_name.name);
 153
 154         if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
 155                 ret = ERR_PTR(-ENAMETOOLONG);
 156                 goto bail;
 157         }
 158
 159         mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len,
 160              dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno);
 161
 162         status = ocfs2_meta_lock(dir, NULL, 0);
 163         if (status < 0) {
 164                 if (status != -ENOENT)
 165                         mlog_errno(status);
 166                 ret = ERR_PTR(status);
 167                 goto bail;
 168         }
 169
 170         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 171                                           dentry->d_name.len, &blkno,
 172                                           dir, &dirent_bh, &dirent);
 173         if (status < 0)
 174                 goto bail_add;
 175
 176         inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0);
 177         if (IS_ERR(inode)) {
 178                 mlog(ML_ERROR, "Unable to create inode %llu\n",
 179                      (unsigned long long)blkno);
 180                 ret = ERR_PTR(-EACCES);
 181                 goto bail_unlock;
 182         }
 183
 184         oi = OCFS2_I(inode);
 185         /* Clear any orphaned state... If we were able to look up the
 186          * inode from a directory, it certainly can't be orphaned. We
 187          * might have the bad state from a node which intended to
 188          * orphan this inode but crashed before it could commit the
 189          * unlink. */
 190         spin_lock(&oi->ip_lock);
 191         oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
 192         oi->ip_orphaned_slot = OCFS2_INVALID_SLOT;
 193         spin_unlock(&oi->ip_lock);
 194
 195 bail_add:
 196         dentry->d_op = &ocfs2_dentry_ops;
 197         ret = d_splice_alias(inode, dentry);
 198
 199         if (inode) {
 200                 /*
 201                  * If d_splice_alias() finds a DCACHE_DISCONNECTED
 202                  * dentry, it will d_move() it on top of ourse. The
 203                  * return value will indicate this however, so in
 204                  * those cases, we switch them around for the locking
 205                  * code.
 206                  *
 207                  * NOTE: This dentry already has ->d_op set from
 208                  * ocfs2_get_parent() and ocfs2_get_dentry()
 209                  */
 210                 if (ret)
 211                         dentry = ret;
 212
 213                 status = ocfs2_dentry_attach_lock(dentry, inode,
 214                                                   OCFS2_I(dir)->ip_blkno);
 215                 if (status) {
 216                         mlog_errno(status);
 217                         ret = ERR_PTR(status);
 218                         goto bail_unlock;
 219                 }
 220         }
 221
 222 bail_unlock:
 223         /* Don't drop the cluster lock until *after* the d_add --
 224          * unlink on another node will message us to remove that
 225          * dentry under this lock so otherwise we can race this with
 226          * the vote thread and have a stale dentry. */
 227         ocfs2_meta_unlock(dir, 0);
 228
 229 bail:
 230         if (dirent_bh)
 231                 brelse(dirent_bh);
 232
 233         mlog_exit_ptr(ret);
 234
 235         return ret;
 236 }
 237
 238 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
 239                               struct ocfs2_journal_handle *handle,
 240                               struct inode *parent,
 241                               struct inode *inode,
 242                               struct buffer_head *fe_bh,
 243                               struct ocfs2_alloc_context *data_ac)
 244 {
 245         int status;
 246         struct buffer_head *new_bh = NULL;
 247         struct ocfs2_dir_entry *de = NULL;
 248
 249         mlog_entry_void();
 250
 251         status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
 252                                      data_ac, NULL, &new_bh);
 253         if (status < 0) {
 254                 mlog_errno(status);
 255                 goto bail;
 256         }
 257
 258         ocfs2_set_new_buffer_uptodate(inode, new_bh);
 259
 260         status = ocfs2_journal_access(handle, inode, new_bh,
 261                                       OCFS2_JOURNAL_ACCESS_CREATE);
 262         if (status < 0) {
 263                 mlog_errno(status);
 264                 goto bail;
 265         }
 266         memset(new_bh->b_data, 0, osb->sb->s_blocksize);
 267
 268         de = (struct ocfs2_dir_entry *) new_bh->b_data;
 269         de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
 270         de->name_len = 1;
 271         de->rec_len =
 272                 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
 273         strcpy(de->name, ".");
 274         ocfs2_set_de_type(de, S_IFDIR);
 275         de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
 276         de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
 277         de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize -
 278                                   OCFS2_DIR_REC_LEN(1));
 279         de->name_len = 2;
 280         strcpy(de->name, "..");
 281         ocfs2_set_de_type(de, S_IFDIR);
 282
 283         status = ocfs2_journal_dirty(handle, new_bh);
 284         if (status < 0) {
 285                 mlog_errno(status);
 286                 goto bail;
 287         }
 288
 289         i_size_write(inode, inode->i_sb->s_blocksize);
 290         inode->i_nlink = 2;
 291         inode->i_blocks = ocfs2_align_bytes_to_sectors(inode->i_sb->s_blocksize);
 292         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
 293         if (status < 0) {
 294                 mlog_errno(status);
 295                 goto bail;
 296         }
 297
 298         status = 0;
 299 bail:
 300         if (new_bh)
 301                 brelse(new_bh);
 302
 303         mlog_exit(status);
 304         return status;
 305 }
 306
 307 static int ocfs2_mknod(struct inode *dir,
 308                        struct dentry *dentry,
 309                        int mode,
 310                        dev_t dev)
 311 {
 312         int status = 0;
 313         struct buffer_head *parent_fe_bh = NULL;
 314         struct ocfs2_journal_handle *handle = NULL;
 315         struct ocfs2_super *osb;
 316         struct ocfs2_dinode *dirfe;
 317         struct buffer_head *new_fe_bh = NULL;
 318         struct buffer_head *de_bh = NULL;
 319         struct inode *inode = NULL;
 320         struct ocfs2_alloc_context *inode_ac = NULL;
 321         struct ocfs2_alloc_context *data_ac = NULL;
 322
 323         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 324                    (unsigned long)dev, dentry->d_name.len,
 325                    dentry->d_name.name);
 326
 327         /* get our super block */
 328         osb = OCFS2_SB(dir->i_sb);
 329
 330         status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
 331         if (status < 0) {
 332                 if (status != -ENOENT)
 333                         mlog_errno(status);
 334                 return status;
 335         }
 336
 337         if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
 338                 status = -EMLINK;
 339                 goto leave;
 340         }
 341
 342         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
 343         if (!dirfe->i_links_count) {
 344                 /* can't make a file in a deleted directory. */
 345                 status = -ENOENT;
 346                 goto leave;
 347         }
 348
 349         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 350                                            dentry->d_name.len);
 351         if (status)
 352                 goto leave;
 353
 354         /* get a spot inside the dir. */
 355         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 356                                               dentry->d_name.name,
 357                                               dentry->d_name.len, &de_bh);
 358         if (status < 0) {
 359                 mlog_errno(status);
 360                 goto leave;
 361         }
 362
 363         /* reserve an inode spot */
 364         status = ocfs2_reserve_new_inode(osb, &inode_ac);
 365         if (status < 0) {
 366                 if (status != -ENOSPC)
 367                         mlog_errno(status);
 368                 goto leave;
 369         }
 370
 371         /* are we making a directory? If so, reserve a cluster for his
 372          * 1st extent. */
 373         if (S_ISDIR(mode)) {
 374                 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
 375                 if (status < 0) {
 376                         if (status != -ENOSPC)
 377                                 mlog_errno(status);
 378                         goto leave;
 379                 }
 380         }
 381
 382         handle = ocfs2_start_trans(osb, NULL, OCFS2_MKNOD_CREDITS);
 383         if (IS_ERR(handle)) {
 384                 status = PTR_ERR(handle);
 385                 handle = NULL;
 386                 mlog_errno(status);
 387                 goto leave;
 388         }
 389
 390         /* do the real work now. */
 391         status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
 392                                     &new_fe_bh, parent_fe_bh, handle,
 393                                     &inode, inode_ac);
 394         if (status < 0) {
 395                 mlog_errno(status);
 396                 goto leave;
 397         }
 398
 399         if (S_ISDIR(mode)) {
 400                 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
 401                                             new_fe_bh, data_ac);
 402                 if (status < 0) {
 403                         mlog_errno(status);
 404                         goto leave;
 405                 }
 406
 407                 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
 408                                               OCFS2_JOURNAL_ACCESS_WRITE);
 409                 if (status < 0) {
 410                         mlog_errno(status);
 411                         goto leave;
 412                 }
 413                 le16_add_cpu(&dirfe->i_links_count, 1);
 414                 status = ocfs2_journal_dirty(handle, parent_fe_bh);
 415                 if (status < 0) {
 416                         mlog_errno(status);
 417                         goto leave;
 418                 }
 419                 inc_nlink(dir);
 420         }
 421
 422         status = ocfs2_add_entry(handle, dentry, inode,
 423                                  OCFS2_I(inode)->ip_blkno, parent_fe_bh,
 424                                  de_bh);
 425         if (status < 0) {
 426                 mlog_errno(status);
 427                 goto leave;
 428         }
 429
 430         status = ocfs2_dentry_attach_lock(dentry, inode,
 431                                           OCFS2_I(dir)->ip_blkno);
 432         if (status) {
 433                 mlog_errno(status);
 434                 goto leave;
 435         }
 436
 437         insert_inode_hash(inode);
 438         dentry->d_op = &ocfs2_dentry_ops;
 439         d_instantiate(dentry, inode);
 440         status = 0;
 441 leave:
 442         if (handle)
 443                 ocfs2_commit_trans(handle);
 444
 445         ocfs2_meta_unlock(dir, 1);
 446
 447         if (status == -ENOSPC)
 448                 mlog(0, "Disk is full\n");
 449
 450         if (new_fe_bh)
 451                 brelse(new_fe_bh);
 452
 453         if (de_bh)
 454                 brelse(de_bh);
 455
 456         if (parent_fe_bh)
 457                 brelse(parent_fe_bh);
 458
 459         if ((status < 0) && inode)
 460                 iput(inode);
 461
 462         if (inode_ac)
 463                 ocfs2_free_alloc_context(inode_ac);
 464
 465         if (data_ac)
 466                 ocfs2_free_alloc_context(data_ac);
 467
 468         mlog_exit(status);
 469
 470         return status;
 471 }
 472
 473 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 474                               struct inode *dir,
 475                               struct dentry *dentry, int mode,
 476                               dev_t dev,
 477                               struct buffer_head **new_fe_bh,
 478                               struct buffer_head *parent_fe_bh,
 479                               struct ocfs2_journal_handle *handle,
 480                               struct inode **ret_inode,
 481                               struct ocfs2_alloc_context *inode_ac)
 482 {
 483         int status = 0;
 484         struct ocfs2_dinode *fe = NULL;
 485         struct ocfs2_extent_list *fel;
 486         u64 fe_blkno = 0;
 487         u16 suballoc_bit;
 488         struct inode *inode = NULL;
 489
 490         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 491                    (unsigned long)dev, dentry->d_name.len,
 492                    dentry->d_name.name);
 493
 494         *new_fe_bh = NULL;
 495         *ret_inode = NULL;
 496
 497         status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
 498                                        &fe_blkno);
 499         if (status < 0) {
 500                 mlog_errno(status);
 501                 goto leave;
 502         }
 503
 504         inode = new_inode(dir->i_sb);
 505         if (IS_ERR(inode)) {
 506                 status = PTR_ERR(inode);
 507                 mlog(ML_ERROR, "new_inode failed!\n");
 508                 goto leave;
 509         }
 510
 511         /* populate as many fields early on as possible - many of
 512          * these are used by the support functions here and in
 513          * callers. */
 514         inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
 515         OCFS2_I(inode)->ip_blkno = fe_blkno;
 516         if (S_ISDIR(mode))
 517                 inode->i_nlink = 2;
 518         else
 519                 inode->i_nlink = 1;
 520         inode->i_mode = mode;
 521         spin_lock(&osb->osb_lock);
 522         inode->i_generation = osb->s_next_generation++;
 523         spin_unlock(&osb->osb_lock);
 524
 525         *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
 526         if (!*new_fe_bh) {
 527                 status = -EIO;
 528                 mlog_errno(status);
 529                 goto leave;
 530         }
 531         ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
 532
 533         status = ocfs2_journal_access(handle, inode, *new_fe_bh,
 534                                       OCFS2_JOURNAL_ACCESS_CREATE);
 535         if (status < 0) {
 536                 mlog_errno(status);
 537                 goto leave;
 538         }
 539
 540         fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
 541         memset(fe, 0, osb->sb->s_blocksize);
 542
 543         fe->i_generation = cpu_to_le32(inode->i_generation);
 544         fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
 545         fe->i_blkno = cpu_to_le64(fe_blkno);
 546         fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
 547         fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
 548         fe->i_uid = cpu_to_le32(current->fsuid);
 549         if (dir->i_mode & S_ISGID) {
 550                 fe->i_gid = cpu_to_le32(dir->i_gid);
 551                 if (S_ISDIR(mode))
 552                         mode |= S_ISGID;
 553         } else
 554                 fe->i_gid = cpu_to_le32(current->fsgid);
 555         fe->i_mode = cpu_to_le16(mode);
 556         if (S_ISCHR(mode) || S_ISBLK(mode))
 557                 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
 558
 559         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 560
 561         fe->i_last_eb_blk = 0;
 562         strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
 563         le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
 564         fe->i_atime = fe->i_ctime = fe->i_mtime =
 565                 cpu_to_le64(CURRENT_TIME.tv_sec);
 566         fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
 567                 cpu_to_le32(CURRENT_TIME.tv_nsec);
 568         fe->i_dtime = 0;
 569
 570         fel = &fe->id2.i_list;
 571         fel->l_tree_depth = 0;
 572         fel->l_next_free_rec = 0;
 573         fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
 574
 575         status = ocfs2_journal_dirty(handle, *new_fe_bh);
 576         if (status < 0) {
 577                 mlog_errno(status);
 578                 goto leave;
 579         }
 580
 581         if (ocfs2_populate_inode(inode, fe, 1) < 0) {
 582                 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
 583                      "i_blkno=%llu, i_ino=%lu\n",
 584                      (unsigned long long) (*new_fe_bh)->b_blocknr,
 585                      (unsigned long long)fe->i_blkno, inode->i_ino);
 586                 BUG();
 587         }
 588
 589         ocfs2_inode_set_new(osb, inode);
 590         status = ocfs2_create_new_inode_locks(inode);
 591         if (status < 0)
 592                 mlog_errno(status);
 593
 594         status = 0; /* error in ocfs2_create_new_inode_locks is not
 595                      * critical */
 596
 597         *ret_inode = inode;
 598 leave:
 599         if (status < 0) {
 600                 if (*new_fe_bh) {
 601                         brelse(*new_fe_bh);
 602                         *new_fe_bh = NULL;
 603                 }
 604                 if (inode)
 605                         iput(inode);
 606         }
 607
 608         mlog_exit(status);
 609         return status;
 610 }
 611
 612 static int ocfs2_mkdir(struct inode *dir,
 613                        struct dentry *dentry,
 614                        int mode)
 615 {
 616         int ret;
 617
 618         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 619                    dentry->d_name.len, dentry->d_name.name);
 620         ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
 621         mlog_exit(ret);
 622
 623         return ret;
 624 }
 625
 626 static int ocfs2_create(struct inode *dir,
 627                         struct dentry *dentry,
 628                         int mode,
 629                         struct nameidata *nd)
 630 {
 631         int ret;
 632
 633         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 634                    dentry->d_name.len, dentry->d_name.name);
 635         ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
 636         mlog_exit(ret);
 637
 638         return ret;
 639 }
 640
 641 static int ocfs2_link(struct dentry *old_dentry,
 642                       struct inode *dir,
 643                       struct dentry *dentry)
 644 {
 645         struct ocfs2_journal_handle *handle;
 646         struct inode *inode = old_dentry->d_inode;
 647         int err;
 648         struct buffer_head *fe_bh = NULL;
 649         struct buffer_head *parent_fe_bh = NULL;
 650         struct buffer_head *de_bh = NULL;
 651         struct ocfs2_dinode *fe = NULL;
 652         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 653
 654         mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
 655                    old_dentry->d_name.len, old_dentry->d_name.name,
 656                    dentry->d_name.len, dentry->d_name.name);
 657
 658         if (S_ISDIR(inode->i_mode))
 659                 return -EPERM;
 660
 661         err = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
 662         if (err < 0) {
 663                 if (err != -ENOENT)
 664                         mlog_errno(err);
 665                 return err;
 666         }
 667
 668         if (!dir->i_nlink) {
 669                 err = -ENOENT;
 670                 goto out;
 671         }
 672
 673         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 674                                         dentry->d_name.len);
 675         if (err)
 676                 goto out;
 677
 678         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 679                                            dentry->d_name.name,
 680                                            dentry->d_name.len, &de_bh);
 681         if (err < 0) {
 682                 mlog_errno(err);
 683                 goto out;
 684         }
 685
 686         err = ocfs2_meta_lock(inode, &fe_bh, 1);
 687         if (err < 0) {
 688                 if (err != -ENOENT)
 689                         mlog_errno(err);
 690                 goto out;
 691         }
 692
 693         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 694         if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
 695                 err = -EMLINK;
 696                 goto out_unlock_inode;
 697         }
 698
 699         handle = ocfs2_start_trans(osb, NULL, OCFS2_LINK_CREDITS);
 700         if (IS_ERR(handle)) {
 701                 err = PTR_ERR(handle);
 702                 handle = NULL;
 703                 mlog_errno(err);
 704                 goto out_unlock_inode;
 705         }
 706
 707         err = ocfs2_journal_access(handle, inode, fe_bh,
 708                                    OCFS2_JOURNAL_ACCESS_WRITE);
 709         if (err < 0) {
 710                 mlog_errno(err);
 711                 goto out_commit;
 712         }
 713
 714         inc_nlink(inode);
 715         inode->i_ctime = CURRENT_TIME;
 716         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 717         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 718         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 719
 720         err = ocfs2_journal_dirty(handle, fe_bh);
 721         if (err < 0) {
 722                 le16_add_cpu(&fe->i_links_count, -1);
 723                 drop_nlink(inode);
 724                 mlog_errno(err);
 725                 goto out_commit;
 726         }
 727
 728         err = ocfs2_add_entry(handle, dentry, inode,
 729                               OCFS2_I(inode)->ip_blkno,
 730                               parent_fe_bh, de_bh);
 731         if (err) {
 732                 le16_add_cpu(&fe->i_links_count, -1);
 733                 drop_nlink(inode);
 734                 mlog_errno(err);
 735                 goto out_commit;
 736         }
 737
 738         err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
 739         if (err) {
 740                 mlog_errno(err);
 741                 goto out_commit;
 742         }
 743
 744         atomic_inc(&inode->i_count);
 745         dentry->d_op = &ocfs2_dentry_ops;
 746         d_instantiate(dentry, inode);
 747
 748 out_commit:
 749         ocfs2_commit_trans(handle);
 750 out_unlock_inode:
 751         ocfs2_meta_unlock(inode, 1);
 752
 753 out:
 754         ocfs2_meta_unlock(dir, 1);
 755
 756         if (de_bh)
 757                 brelse(de_bh);
 758         if (fe_bh)
 759                 brelse(fe_bh);
 760         if (parent_fe_bh)
 761                 brelse(parent_fe_bh);
 762
 763         mlog_exit(err);
 764
 765         return err;
 766 }
 767
 768 /*
 769  * Takes and drops an exclusive lock on the given dentry. This will
 770  * force other nodes to drop it.
 771  */
 772 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
 773 {
 774         int ret;
 775
 776         ret = ocfs2_dentry_lock(dentry, 1);
 777         if (ret)
 778                 mlog_errno(ret);
 779         else
 780                 ocfs2_dentry_unlock(dentry, 1);
 781
 782         return ret;
 783 }
 784
 785 static inline int inode_is_unlinkable(struct inode *inode)
 786 {
 787         if (S_ISDIR(inode->i_mode)) {
 788                 if (inode->i_nlink == 2)
 789                         return 1;
 790                 return 0;
 791         }
 792
 793         if (inode->i_nlink == 1)
 794                 return 1;
 795         return 0;
 796 }
 797
 798 static int ocfs2_unlink(struct inode *dir,
 799                         struct dentry *dentry)
 800 {
 801         int status;
 802         int child_locked = 0;
 803         struct inode *inode = dentry->d_inode;
 804         struct inode *orphan_dir = NULL;
 805         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 806         u64 blkno;
 807         struct ocfs2_dinode *fe = NULL;
 808         struct buffer_head *fe_bh = NULL;
 809         struct buffer_head *parent_node_bh = NULL;
 810         struct ocfs2_journal_handle *handle = NULL;
 811         struct ocfs2_dir_entry *dirent = NULL;
 812         struct buffer_head *dirent_bh = NULL;
 813         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
 814         struct buffer_head *orphan_entry_bh = NULL;
 815
 816         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 817                    dentry->d_name.len, dentry->d_name.name);
 818
 819         BUG_ON(dentry->d_parent->d_inode != dir);
 820
 821         mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
 822
 823         if (inode == osb->root_inode) {
 824                 mlog(0, "Cannot delete the root directory\n");
 825                 return -EPERM;
 826         }
 827
 828         status = ocfs2_meta_lock(dir, &parent_node_bh, 1);
 829         if (status < 0) {
 830                 if (status != -ENOENT)
 831                         mlog_errno(status);
 832                 return status;
 833         }
 834
 835         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 836                                           dentry->d_name.len, &blkno,
 837                                           dir, &dirent_bh, &dirent);
 838         if (status < 0) {
 839                 if (status != -ENOENT)
 840                         mlog_errno(status);
 841                 goto leave;
 842         }
 843
 844         if (OCFS2_I(inode)->ip_blkno != blkno) {
 845                 status = -ENOENT;
 846
 847                 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
 848                      (unsigned long long)OCFS2_I(inode)->ip_blkno,
 849                      (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
 850                 goto leave;
 851         }
 852
 853         status = ocfs2_meta_lock(inode, &fe_bh, 1);
 854         if (status < 0) {
 855                 if (status != -ENOENT)
 856                         mlog_errno(status);
 857                 goto leave;
 858         }
 859         child_locked = 1;
 860
 861         if (S_ISDIR(inode->i_mode)) {
 862                 if (!ocfs2_empty_dir(inode)) {
 863                         status = -ENOTEMPTY;
 864                         goto leave;
 865                 } else if (inode->i_nlink != 2) {
 866                         status = -ENOTEMPTY;
 867                         goto leave;
 868                 }
 869         }
 870
 871         status = ocfs2_remote_dentry_delete(dentry);
 872         if (status < 0) {
 873                 /* This vote should succeed under all normal
 874                  * circumstances. */
 875                 mlog_errno(status);
 876                 goto leave;
 877         }
 878
 879         if (inode_is_unlinkable(inode)) {
 880                 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
 881                                                   orphan_name,
 882                                                   &orphan_entry_bh);
 883                 if (status < 0) {
 884                         mlog_errno(status);
 885                         goto leave;
 886                 }
 887         }
 888
 889         handle = ocfs2_start_trans(osb, NULL, OCFS2_UNLINK_CREDITS);
 890         if (IS_ERR(handle)) {
 891                 status = PTR_ERR(handle);
 892                 handle = NULL;
 893                 mlog_errno(status);
 894                 goto leave;
 895         }
 896
 897         status = ocfs2_journal_access(handle, inode, fe_bh,
 898                                       OCFS2_JOURNAL_ACCESS_WRITE);
 899         if (status < 0) {
 900                 mlog_errno(status);
 901                 goto leave;
 902         }
 903
 904         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 905
 906         if (inode_is_unlinkable(inode)) {
 907                 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
 908                                           orphan_entry_bh, orphan_dir);
 909                 if (status < 0) {
 910                         mlog_errno(status);
 911                         goto leave;
 912                 }
 913         }
 914
 915         /* delete the name from the parent dir */
 916         status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
 917         if (status < 0) {
 918                 mlog_errno(status);
 919                 goto leave;
 920         }
 921
 922         if (S_ISDIR(inode->i_mode))
 923                 drop_nlink(inode);
 924         drop_nlink(inode);
 925         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 926
 927         status = ocfs2_journal_dirty(handle, fe_bh);
 928         if (status < 0) {
 929                 mlog_errno(status);
 930                 goto leave;
 931         }
 932
 933         if (S_ISDIR(inode->i_mode)) {
 934                 drop_nlink(dir);
 935                 status = ocfs2_mark_inode_dirty(handle, dir,
 936                                                 parent_node_bh);
 937                 if (status < 0) {
 938                         mlog_errno(status);
 939                         inc_nlink(dir);
 940                 }
 941         }
 942
 943 leave:
 944         if (handle)
 945                 ocfs2_commit_trans(handle);
 946
 947         if (child_locked)
 948                 ocfs2_meta_unlock(inode, 1);
 949
 950         ocfs2_meta_unlock(dir, 1);
 951
 952         if (orphan_dir) {
 953                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
 954                 ocfs2_meta_unlock(orphan_dir, 1);
 955                 mutex_unlock(&orphan_dir->i_mutex);
 956                 iput(orphan_dir);
 957         }
 958
 959         if (fe_bh)
 960                 brelse(fe_bh);
 961
 962         if (dirent_bh)
 963                 brelse(dirent_bh);
 964
 965         if (parent_node_bh)
 966                 brelse(parent_node_bh);
 967
 968         if (orphan_entry_bh)
 969                 brelse(orphan_entry_bh);
 970
 971         mlog_exit(status);
 972
 973         return status;
 974 }
 975
 976 /*
 977  * The only place this should be used is rename!
 978  * if they have the same id, then the 1st one is the only one locked.
 979  */
 980 static int ocfs2_double_lock(struct ocfs2_super *osb,
 981                              struct buffer_head **bh1,
 982                              struct inode *inode1,
 983                              struct buffer_head **bh2,
 984                              struct inode *inode2)
 985 {
 986         int status;
 987         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
 988         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
 989         struct buffer_head **tmpbh;
 990         struct inode *tmpinode;
 991
 992         mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
 993                    (unsigned long long)oi1->ip_blkno,
 994                    (unsigned long long)oi2->ip_blkno);
 995
 996         if (*bh1)
 997                 *bh1 = NULL;
 998         if (*bh2)
 999                 *bh2 = NULL;
1000
1001         /* we always want to lock the one with the lower lockid first. */
1002         if (oi1->ip_blkno != oi2->ip_blkno) {
1003                 if (oi1->ip_blkno < oi2->ip_blkno) {
1004                         /* switch id1 and id2 around */
1005                         mlog(0, "switching them around...\n");
1006                         tmpbh = bh2;
1007                         bh2 = bh1;
1008                         bh1 = tmpbh;
1009
1010                         tmpinode = inode2;
1011                         inode2 = inode1;
1012                         inode1 = tmpinode;
1013                 }
1014                 /* lock id2 */
1015                 status = ocfs2_meta_lock(inode2, bh2, 1);
1016                 if (status < 0) {
1017                         if (status != -ENOENT)
1018                                 mlog_errno(status);
1019                         goto bail;
1020                 }
1021         }
1022
1023         /* lock id1 */
1024         status = ocfs2_meta_lock(inode1, bh1, 1);
1025         if (status < 0) {
1026                 /*
1027                  * An error return must mean that no cluster locks
1028                  * were held on function exit.
1029                  */
1030                 if (oi1->ip_blkno != oi2->ip_blkno)
1031                         ocfs2_meta_unlock(inode2, 1);
1032
1033                 if (status != -ENOENT)
1034                         mlog_errno(status);
1035         }
1036
1037 bail:
1038         mlog_exit(status);
1039         return status;
1040 }
1041
1042 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1043 {
1044         ocfs2_meta_unlock(inode1, 1);
1045
1046         if (inode1 != inode2)
1047                 ocfs2_meta_unlock(inode2, 1);
1048 }
1049
1050 #define PARENT_INO(buffer) \
1051         ((struct ocfs2_dir_entry *) \
1052          ((char *)buffer + \
1053           le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
1054
1055 static int ocfs2_rename(struct inode *old_dir,
1056                         struct dentry *old_dentry,
1057                         struct inode *new_dir,
1058                         struct dentry *new_dentry)
1059 {
1060         int status = 0, rename_lock = 0, parents_locked = 0;
1061         int old_child_locked = 0, new_child_locked = 0;
1062         struct inode *old_inode = old_dentry->d_inode;
1063         struct inode *new_inode = new_dentry->d_inode;
1064         struct inode *orphan_dir = NULL;
1065         struct ocfs2_dinode *newfe = NULL;
1066         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1067         struct buffer_head *orphan_entry_bh = NULL;
1068         struct buffer_head *newfe_bh = NULL;
1069         struct buffer_head *insert_entry_bh = NULL;
1070         struct ocfs2_super *osb = NULL;
1071         u64 newfe_blkno;
1072         struct ocfs2_journal_handle *handle = NULL;
1073         struct buffer_head *old_dir_bh = NULL;
1074         struct buffer_head *new_dir_bh = NULL;
1075         struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry
1076                                                                // and new_dentry
1077         struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
1078         struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
1079                                                     // this is the 1st dirent bh
1080         nlink_t old_dir_nlink = old_dir->i_nlink, new_dir_nlink = new_dir->i_nlink;
1081
1082         /* At some point it might be nice to break this function up a
1083          * bit. */
1084
1085         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1086                    old_dir, old_dentry, new_dir, new_dentry,
1087                    old_dentry->d_name.len, old_dentry->d_name.name,
1088                    new_dentry->d_name.len, new_dentry->d_name.name);
1089
1090         osb = OCFS2_SB(old_dir->i_sb);
1091
1092         if (new_inode) {
1093                 if (!igrab(new_inode))
1094                         BUG();
1095         }
1096
1097         /* Assume a directory heirarchy thusly:
1098          * a/b/c
1099          * a/d
1100          * a,b,c, and d are all directories.
1101          *
1102          * from cwd of 'a' on both nodes:
1103          * node1: mv b/c d
1104          * node2: mv d   b/c
1105          *
1106          * And that's why, just like the VFS, we need a file system
1107          * rename lock. */
1108         if (old_dentry != new_dentry) {
1109                 status = ocfs2_rename_lock(osb);
1110                 if (status < 0) {
1111                         mlog_errno(status);
1112                         goto bail;
1113                 }
1114                 rename_lock = 1;
1115         }
1116
1117         /* if old and new are the same, this'll just do one lock. */
1118         status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1119                                    &new_dir_bh, new_dir);
1120         if (status < 0) {
1121                 mlog_errno(status);
1122                 goto bail;
1123         }
1124         parents_locked = 1;
1125
1126         /* make sure both dirs have bhs
1127          * get an extra ref on old_dir_bh if old==new */
1128         if (!new_dir_bh) {
1129                 if (old_dir_bh) {
1130                         new_dir_bh = old_dir_bh;
1131                         get_bh(new_dir_bh);
1132                 } else {
1133                         mlog(ML_ERROR, "no old_dir_bh!\n");
1134                         status = -EIO;
1135                         goto bail;
1136                 }
1137         }
1138
1139         /*
1140          * Though we don't require an inode meta data update if
1141          * old_inode is not a directory, we lock anyway here to ensure
1142          * the vote thread on other nodes won't have to concurrently
1143          * downconvert the inode and the dentry locks.
1144          */
1145         status = ocfs2_meta_lock(old_inode, NULL, 1);
1146         if (status < 0) {
1147                 if (status != -ENOENT)
1148                         mlog_errno(status);
1149                 goto bail;
1150         }
1151         old_child_locked = 1;
1152
1153         status = ocfs2_remote_dentry_delete(old_dentry);
1154         if (status < 0) {
1155                 mlog_errno(status);
1156                 goto bail;
1157         }
1158
1159         if (S_ISDIR(old_inode->i_mode)) {
1160                 status = -EIO;
1161                 old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0);
1162                 if (!old_inode_de_bh)
1163                         goto bail;
1164
1165                 status = -EIO;
1166                 if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) !=
1167                     OCFS2_I(old_dir)->ip_blkno)
1168                         goto bail;
1169                 status = -EMLINK;
1170                 if (!new_inode && new_dir!=old_dir &&
1171                     new_dir->i_nlink >= OCFS2_LINK_MAX)
1172                         goto bail;
1173         }
1174
1175         status = -ENOENT;
1176         old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1177                                      old_dentry->d_name.len,
1178                                      old_dir, &old_de);
1179         if (!old_de_bh)
1180                 goto bail;
1181
1182         /*
1183          *  Check for inode number is _not_ due to possible IO errors.
1184          *  We might rmdir the source, keep it as pwd of some process
1185          *  and merrily kill the link to whatever was created under the
1186          *  same name. Goodbye sticky bit ;-<
1187          */
1188         if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno)
1189                 goto bail;
1190
1191         /* check if the target already exists (in which case we need
1192          * to delete it */
1193         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1194                                           new_dentry->d_name.len,
1195                                           &newfe_blkno, new_dir, &new_de_bh,
1196                                           &new_de);
1197         /* The only error we allow here is -ENOENT because the new
1198          * file not existing is perfectly valid. */
1199         if ((status < 0) && (status != -ENOENT)) {
1200                 /* If we cannot find the file specified we should just */
1201                 /* return the error... */
1202                 mlog_errno(status);
1203                 goto bail;
1204         }
1205
1206         if (!new_de && new_inode)
1207                 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1208                      "directory!", new_inode->i_ino);
1209
1210         /* In case we need to overwrite an existing file, we blow it
1211          * away first */
1212         if (new_de) {
1213                 /* VFS didn't think there existed an inode here, but
1214                  * someone else in the cluster must have raced our
1215                  * rename to create one. Today we error cleanly, in
1216                  * the future we should consider calling iget to build
1217                  * a new struct inode for this entry. */
1218                 if (!new_inode) {
1219                         status = -EACCES;
1220
1221                         mlog(0, "We found an inode for name %.*s but VFS "
1222                              "didn't give us one.\n", new_dentry->d_name.len,
1223                              new_dentry->d_name.name);
1224                         goto bail;
1225                 }
1226
1227                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1228                         status = -EACCES;
1229
1230                         mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1231                              (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1232                              (unsigned long long)newfe_blkno,
1233                              OCFS2_I(new_inode)->ip_flags);
1234                         goto bail;
1235                 }
1236
1237                 status = ocfs2_meta_lock(new_inode, &newfe_bh, 1);
1238                 if (status < 0) {
1239                         if (status != -ENOENT)
1240                                 mlog_errno(status);
1241                         goto bail;
1242                 }
1243                 new_child_locked = 1;
1244
1245                 status = ocfs2_remote_dentry_delete(new_dentry);
1246                 if (status < 0) {
1247                         mlog_errno(status);
1248                         goto bail;
1249                 }
1250
1251                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1252
1253                 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1254                      "newfebh=%p bhblocknr=%llu\n", new_de,
1255                      (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1256                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1257
1258                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1259                         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1260                                                           new_inode,
1261                                                           orphan_name,
1262                                                           &orphan_entry_bh);
1263                         if (status < 0) {
1264                                 mlog_errno(status);
1265                                 goto bail;
1266                         }
1267                 }
1268         } else {
1269                 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1270
1271                 status = ocfs2_check_dir_for_entry(new_dir,
1272                                                    new_dentry->d_name.name,
1273                                                    new_dentry->d_name.len);
1274                 if (status)
1275                         goto bail;
1276
1277                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1278                                                       new_dentry->d_name.name,
1279                                                       new_dentry->d_name.len,
1280                                                       &insert_entry_bh);
1281                 if (status < 0) {
1282                         mlog_errno(status);
1283                         goto bail;
1284                 }
1285         }
1286
1287         handle = ocfs2_start_trans(osb, NULL, OCFS2_RENAME_CREDITS);
1288         if (IS_ERR(handle)) {
1289                 status = PTR_ERR(handle);
1290                 handle = NULL;
1291                 mlog_errno(status);
1292                 goto bail;
1293         }
1294
1295         if (new_de) {
1296                 if (S_ISDIR(new_inode->i_mode)) {
1297                         if (!ocfs2_empty_dir(new_inode) ||
1298                             new_inode->i_nlink != 2) {
1299                                 status = -ENOTEMPTY;
1300                                 goto bail;
1301                         }
1302                 }
1303                 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1304                                               OCFS2_JOURNAL_ACCESS_WRITE);
1305                 if (status < 0) {
1306                         mlog_errno(status);
1307                         goto bail;
1308                 }
1309
1310                 if (S_ISDIR(new_inode->i_mode) ||
1311                     (newfe->i_links_count == cpu_to_le16(1))){
1312                         status = ocfs2_orphan_add(osb, handle, new_inode,
1313                                                   newfe, orphan_name,
1314                                                   orphan_entry_bh, orphan_dir);
1315                         if (status < 0) {
1316                                 mlog_errno(status);
1317                                 goto bail;
1318                         }
1319                 }
1320
1321                 /* change the dirent to point to the correct inode */
1322                 status = ocfs2_journal_access(handle, new_dir, new_de_bh,
1323                                               OCFS2_JOURNAL_ACCESS_WRITE);
1324                 if (status < 0) {
1325                         mlog_errno(status);
1326                         goto bail;
1327                 }
1328                 new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno);
1329                 new_de->file_type = old_de->file_type;
1330                 new_dir->i_version++;
1331                 status = ocfs2_journal_dirty(handle, new_de_bh);
1332                 if (status < 0) {
1333                         mlog_errno(status);
1334                         goto bail;
1335                 }
1336
1337                 if (S_ISDIR(new_inode->i_mode))
1338                         newfe->i_links_count = 0;
1339                 else
1340                         le16_add_cpu(&newfe->i_links_count, -1);
1341
1342                 status = ocfs2_journal_dirty(handle, newfe_bh);
1343                 if (status < 0) {
1344                         mlog_errno(status);
1345                         goto bail;
1346                 }
1347         } else {
1348                 /* if the name was not found in new_dir, add it now */
1349                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1350                                          OCFS2_I(old_inode)->ip_blkno,
1351                                          new_dir_bh, insert_entry_bh);
1352         }
1353
1354         old_inode->i_ctime = CURRENT_TIME;
1355         mark_inode_dirty(old_inode);
1356
1357         /* now that the name has been added to new_dir, remove the old name */
1358         status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1359         if (status < 0) {
1360                 mlog_errno(status);
1361                 goto bail;
1362         }
1363
1364         if (new_inode) {
1365                 new_inode->i_nlink--;
1366                 new_inode->i_ctime = CURRENT_TIME;
1367         }
1368         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1369         if (old_inode_de_bh) {
1370                 status = ocfs2_journal_access(handle, old_inode,
1371                                              old_inode_de_bh,
1372                                              OCFS2_JOURNAL_ACCESS_WRITE);
1373                 PARENT_INO(old_inode_de_bh->b_data) =
1374                         cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
1375                 status = ocfs2_journal_dirty(handle, old_inode_de_bh);
1376                 old_dir->i_nlink--;
1377                 if (new_inode) {
1378                         new_inode->i_nlink--;
1379                 } else {
1380                         inc_nlink(new_dir);
1381                         mark_inode_dirty(new_dir);
1382                 }
1383         }
1384         mark_inode_dirty(old_dir);
1385         if (new_inode)
1386                 mark_inode_dirty(new_inode);
1387
1388         if (old_dir != new_dir)
1389                 if (new_dir_nlink != new_dir->i_nlink) {
1390                         if (!new_dir_bh) {
1391                                 mlog(ML_ERROR, "need to change nlink for new "
1392                                      "dir %llu from %d to %d but bh is NULL\n",
1393                                      (unsigned long long)OCFS2_I(new_dir)->ip_blkno,
1394                                      (int)new_dir_nlink, new_dir->i_nlink);
1395                         } else {
1396                                 struct ocfs2_dinode *fe;
1397                                 status = ocfs2_journal_access(handle,
1398                                                               new_dir,
1399                                                               new_dir_bh,
1400                                                               OCFS2_JOURNAL_ACCESS_WRITE);
1401                                 fe = (struct ocfs2_dinode *) new_dir_bh->b_data;
1402                                 fe->i_links_count = cpu_to_le16(new_dir->i_nlink);
1403                                 status = ocfs2_journal_dirty(handle, new_dir_bh);
1404                         }
1405                 }
1406
1407         if (old_dir_nlink != old_dir->i_nlink) {
1408                 if (!old_dir_bh) {
1409                         mlog(ML_ERROR, "need to change nlink for old dir "
1410                              "%llu from %d to %d but bh is NULL!\n",
1411                              (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1412                              (int)old_dir_nlink, old_dir->i_nlink);
1413                 } else {
1414                         struct ocfs2_dinode *fe;
1415                         status = ocfs2_journal_access(handle, old_dir,
1416                                                       old_dir_bh,
1417                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1418                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1419                         fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1420                         status = ocfs2_journal_dirty(handle, old_dir_bh);
1421                 }
1422         }
1423
1424         ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1425         status = 0;
1426 bail:
1427         if (rename_lock)
1428                 ocfs2_rename_unlock(osb);
1429
1430         if (handle)
1431                 ocfs2_commit_trans(handle);
1432
1433         if (parents_locked)
1434                 ocfs2_double_unlock(old_dir, new_dir);
1435
1436         if (old_child_locked)
1437                 ocfs2_meta_unlock(old_inode, 1);
1438
1439         if (new_child_locked)
1440                 ocfs2_meta_unlock(new_inode, 1);
1441
1442         if (orphan_dir) {
1443                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1444                 ocfs2_meta_unlock(orphan_dir, 1);
1445                 mutex_unlock(&orphan_dir->i_mutex);
1446                 iput(orphan_dir);
1447         }
1448
1449         if (new_inode)
1450                 sync_mapping_buffers(old_inode->i_mapping);
1451
1452         if (new_inode)
1453                 iput(new_inode);
1454         if (newfe_bh)
1455                 brelse(newfe_bh);
1456         if (old_dir_bh)
1457                 brelse(old_dir_bh);
1458         if (new_dir_bh)
1459                 brelse(new_dir_bh);
1460         if (new_de_bh)
1461                 brelse(new_de_bh);
1462         if (old_de_bh)
1463                 brelse(old_de_bh);
1464         if (old_inode_de_bh)
1465                 brelse(old_inode_de_bh);
1466         if (orphan_entry_bh)
1467                 brelse(orphan_entry_bh);
1468         if (insert_entry_bh)
1469                 brelse(insert_entry_bh);
1470
1471         mlog_exit(status);
1472
1473         return status;
1474 }
1475
1476 /*
1477  * we expect i_size = strlen(symname). Copy symname into the file
1478  * data, including the null terminator.
1479  */
1480 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1481                                      struct ocfs2_journal_handle *handle,
1482                                      struct inode *inode,
1483                                      const char *symname)
1484 {
1485         struct buffer_head **bhs = NULL;
1486         const char *c;
1487         struct super_block *sb = osb->sb;
1488         u64 p_blkno;
1489         int p_blocks;
1490         int virtual, blocks, status, i, bytes_left;
1491
1492         bytes_left = i_size_read(inode) + 1;
1493         /* we can't trust i_blocks because we're actually going to
1494          * write i_size + 1 bytes. */
1495         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1496
1497         mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1498                         (unsigned long long)inode->i_blocks,
1499                         i_size_read(inode), blocks);
1500
1501         /* Sanity check -- make sure we're going to fit. */
1502         if (bytes_left >
1503             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1504                 status = -EIO;
1505                 mlog_errno(status);
1506                 goto bail;
1507         }
1508
1509         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1510         if (!bhs) {
1511                 status = -ENOMEM;
1512                 mlog_errno(status);
1513                 goto bail;
1514         }
1515
1516         status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno,
1517                                              &p_blocks);
1518         if (status < 0) {
1519                 mlog_errno(status);
1520                 goto bail;
1521         }
1522
1523         /* links can never be larger than one cluster so we know this
1524          * is all going to be contiguous, but do a sanity check
1525          * anyway. */
1526         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1527                 status = -EIO;
1528                 mlog_errno(status);
1529                 goto bail;
1530         }
1531
1532         virtual = 0;
1533         while(bytes_left > 0) {
1534                 c = &symname[virtual * sb->s_blocksize];
1535
1536                 bhs[virtual] = sb_getblk(sb, p_blkno);
1537                 if (!bhs[virtual]) {
1538                         status = -ENOMEM;
1539                         mlog_errno(status);
1540                         goto bail;
1541                 }
1542                 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1543
1544                 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1545                                               OCFS2_JOURNAL_ACCESS_CREATE);
1546                 if (status < 0) {
1547                         mlog_errno(status);
1548                         goto bail;
1549                 }
1550
1551                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1552
1553                 memcpy(bhs[virtual]->b_data, c,
1554                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1555                        bytes_left);
1556
1557                 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1558                 if (status < 0) {
1559                         mlog_errno(status);
1560                         goto bail;
1561                 }
1562
1563                 virtual++;
1564                 p_blkno++;
1565                 bytes_left -= sb->s_blocksize;
1566         }
1567
1568         status = 0;
1569 bail:
1570
1571         if (bhs) {
1572                 for(i = 0; i < blocks; i++)
1573                         if (bhs[i])
1574                                 brelse(bhs[i]);
1575                 kfree(bhs);
1576         }
1577
1578         mlog_exit(status);
1579         return status;
1580 }
1581
1582 static int ocfs2_symlink(struct inode *dir,
1583                          struct dentry *dentry,
1584                          const char *symname)
1585 {
1586         int status, l, credits;
1587         u64 newsize;
1588         struct ocfs2_super *osb = NULL;
1589         struct inode *inode = NULL;
1590         struct super_block *sb;
1591         struct buffer_head *new_fe_bh = NULL;
1592         struct buffer_head *de_bh = NULL;
1593         struct buffer_head *parent_fe_bh = NULL;
1594         struct ocfs2_dinode *fe = NULL;
1595         struct ocfs2_dinode *dirfe;
1596         struct ocfs2_journal_handle *handle = NULL;
1597         struct ocfs2_alloc_context *inode_ac = NULL;
1598         struct ocfs2_alloc_context *data_ac = NULL;
1599
1600         mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1601                    dentry, symname, dentry->d_name.len, dentry->d_name.name);
1602
1603         sb = dir->i_sb;
1604         osb = OCFS2_SB(sb);
1605
1606         l = strlen(symname) + 1;
1607
1608         credits = ocfs2_calc_symlink_credits(sb);
1609
1610         /* lock the parent directory */
1611         status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
1612         if (status < 0) {
1613                 if (status != -ENOENT)
1614                         mlog_errno(status);
1615                 return status;
1616         }
1617
1618         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1619         if (!dirfe->i_links_count) {
1620                 /* can't make a file in a deleted directory. */
1621                 status = -ENOENT;
1622                 goto bail;
1623         }
1624
1625         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1626                                            dentry->d_name.len);
1627         if (status)
1628                 goto bail;
1629
1630         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1631                                               dentry->d_name.name,
1632                                               dentry->d_name.len, &de_bh);
1633         if (status < 0) {
1634                 mlog_errno(status);
1635                 goto bail;
1636         }
1637
1638         status = ocfs2_reserve_new_inode(osb, &inode_ac);
1639         if (status < 0) {
1640                 if (status != -ENOSPC)
1641                         mlog_errno(status);
1642                 goto bail;
1643         }
1644
1645         /* don't reserve bitmap space for fast symlinks. */
1646         if (l > ocfs2_fast_symlink_chars(sb)) {
1647                 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
1648                 if (status < 0) {
1649                         if (status != -ENOSPC)
1650                                 mlog_errno(status);
1651                         goto bail;
1652                 }
1653         }
1654
1655         handle = ocfs2_start_trans(osb, NULL, credits);
1656         if (IS_ERR(handle)) {
1657                 status = PTR_ERR(handle);
1658                 handle = NULL;
1659                 mlog_errno(status);
1660                 goto bail;
1661         }
1662
1663         status = ocfs2_mknod_locked(osb, dir, dentry,
1664                                     S_IFLNK | S_IRWXUGO, 0,
1665                                     &new_fe_bh, parent_fe_bh, handle,
1666                                     &inode, inode_ac);
1667         if (status < 0) {
1668                 mlog_errno(status);
1669                 goto bail;
1670         }
1671
1672         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1673         inode->i_rdev = 0;
1674         newsize = l - 1;
1675         if (l > ocfs2_fast_symlink_chars(sb)) {
1676                 inode->i_op = &ocfs2_symlink_inode_operations;
1677                 status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh,
1678                                                     handle, data_ac, NULL,
1679                                                     NULL);
1680                 if (status < 0) {
1681                         if (status != -ENOSPC && status != -EINTR) {
1682                                 mlog(ML_ERROR,
1683                                      "Failed to extend file to %llu\n",
1684                                      (unsigned long long)newsize);
1685                                 mlog_errno(status);
1686                                 status = -ENOSPC;
1687                         }
1688                         goto bail;
1689                 }
1690                 i_size_write(inode, newsize);
1691                 inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize);
1692         } else {
1693                 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1694                 memcpy((char *) fe->id2.i_symlink, symname, l);
1695                 i_size_write(inode, newsize);
1696                 inode->i_blocks = 0;
1697         }
1698
1699         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1700         if (status < 0) {
1701                 mlog_errno(status);
1702                 goto bail;
1703         }
1704
1705         if (!ocfs2_inode_is_fast_symlink(inode)) {
1706                 status = ocfs2_create_symlink_data(osb, handle, inode,
1707                                                    symname);
1708                 if (status < 0) {
1709                         mlog_errno(status);
1710                         goto bail;
1711                 }
1712         }
1713
1714         status = ocfs2_add_entry(handle, dentry, inode,
1715                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
1716                                  de_bh);
1717         if (status < 0) {
1718                 mlog_errno(status);
1719                 goto bail;
1720         }
1721
1722         status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1723         if (status) {
1724                 mlog_errno(status);
1725                 goto bail;
1726         }
1727
1728         insert_inode_hash(inode);
1729         dentry->d_op = &ocfs2_dentry_ops;
1730         d_instantiate(dentry, inode);
1731 bail:
1732         if (handle)
1733                 ocfs2_commit_trans(handle);
1734
1735         ocfs2_meta_unlock(dir, 1);
1736
1737         if (new_fe_bh)
1738                 brelse(new_fe_bh);
1739         if (parent_fe_bh)
1740                 brelse(parent_fe_bh);
1741         if (de_bh)
1742                 brelse(de_bh);
1743         if (inode_ac)
1744                 ocfs2_free_alloc_context(inode_ac);
1745         if (data_ac)
1746                 ocfs2_free_alloc_context(data_ac);
1747         if ((status < 0) && inode)
1748                 iput(inode);
1749
1750         mlog_exit(status);
1751
1752         return status;
1753 }
1754
1755 int ocfs2_check_dir_entry(struct inode * dir,
1756                           struct ocfs2_dir_entry * de,
1757                           struct buffer_head * bh,
1758                           unsigned long offset)
1759 {
1760         const char *error_msg = NULL;
1761         const int rlen = le16_to_cpu(de->rec_len);
1762
1763         if (rlen < OCFS2_DIR_REC_LEN(1))
1764                 error_msg = "rec_len is smaller than minimal";
1765         else if (rlen % 4 != 0)
1766                 error_msg = "rec_len % 4 != 0";
1767         else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
1768                 error_msg = "rec_len is too small for name_len";
1769         else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
1770                 error_msg = "directory entry across blocks";
1771
1772         if (error_msg != NULL)
1773                 mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
1774                      "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
1775                      (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
1776                      offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
1777                      de->name_len);
1778         return error_msg == NULL ? 1 : 0;
1779 }
1780
1781 /* we don't always have a dentry for what we want to add, so people
1782  * like orphan dir can call this instead.
1783  *
1784  * If you pass me insert_bh, I'll skip the search of the other dir
1785  * blocks and put the record in there.
1786  */
1787 static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle,
1788                              struct inode *dir,
1789                              const char *name, int namelen,
1790                              struct inode *inode, u64 blkno,
1791                              struct buffer_head *parent_fe_bh,
1792                              struct buffer_head *insert_bh)
1793 {
1794         unsigned long offset;
1795         unsigned short rec_len;
1796         struct ocfs2_dir_entry *de, *de1;
1797         struct super_block *sb;
1798         int retval, status;
1799
1800         mlog_entry_void();
1801
1802         sb = dir->i_sb;
1803
1804         if (!namelen)
1805                 return -EINVAL;
1806
1807         rec_len = OCFS2_DIR_REC_LEN(namelen);
1808         offset = 0;
1809         de = (struct ocfs2_dir_entry *) insert_bh->b_data;
1810         while (1) {
1811                 BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data);
1812                 /* These checks should've already been passed by the
1813                  * prepare function, but I guess we can leave them
1814                  * here anyway. */
1815                 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
1816                         retval = -ENOENT;
1817                         goto bail;
1818                 }
1819                 if (ocfs2_match(namelen, name, de)) {
1820                         retval = -EEXIST;
1821                         goto bail;
1822                 }
1823                 if (((le64_to_cpu(de->inode) == 0) &&
1824                      (le16_to_cpu(de->rec_len) >= rec_len)) ||
1825                     (le16_to_cpu(de->rec_len) >=
1826                      (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
1827                         status = ocfs2_journal_access(handle, dir, insert_bh,
1828                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1829                         /* By now the buffer is marked for journaling */
1830                         offset += le16_to_cpu(de->rec_len);
1831                         if (le64_to_cpu(de->inode)) {
1832                                 de1 = (struct ocfs2_dir_entry *)((char *) de +
1833                                         OCFS2_DIR_REC_LEN(de->name_len));
1834                                 de1->rec_len =
1835                                         cpu_to_le16(le16_to_cpu(de->rec_len) -
1836                                         OCFS2_DIR_REC_LEN(de->name_len));
1837                                 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1838                                 de = de1;
1839                         }
1840                         de->file_type = OCFS2_FT_UNKNOWN;
1841                         if (blkno) {
1842                                 de->inode = cpu_to_le64(blkno);
1843                                 ocfs2_set_de_type(de, inode->i_mode);
1844                         } else
1845                                 de->inode = 0;
1846                         de->name_len = namelen;
1847                         memcpy(de->name, name, namelen);
1848
1849                         dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1850                         dir->i_version++;
1851                         status = ocfs2_journal_dirty(handle, insert_bh);
1852                         retval = 0;
1853                         goto bail;
1854                 }
1855                 offset += le16_to_cpu(de->rec_len);
1856                 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
1857         }
1858
1859         /* when you think about it, the assert above should prevent us
1860          * from ever getting here. */
1861         retval = -ENOSPC;
1862 bail:
1863
1864         mlog_exit(retval);
1865         return retval;
1866 }
1867
1868
1869 /*
1870  * ocfs2_delete_entry deletes a directory entry by merging it with the
1871  * previous entry
1872  */
1873 static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle,
1874                               struct inode *dir,
1875                               struct ocfs2_dir_entry *de_del,
1876                               struct buffer_head *bh)
1877 {
1878         struct ocfs2_dir_entry *de, *pde;
1879         int i, status = -ENOENT;
1880
1881         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
1882
1883         i = 0;
1884         pde = NULL;
1885         de = (struct ocfs2_dir_entry *) bh->b_data;
1886         while (i < bh->b_size) {
1887                 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
1888                         status = -EIO;
1889                         mlog_errno(status);
1890                         goto bail;
1891                 }
1892                 if (de == de_del)  {
1893                         status = ocfs2_journal_access(handle, dir, bh,
1894                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1895                         if (status < 0) {
1896                                 status = -EIO;
1897                                 mlog_errno(status);
1898                                 goto bail;
1899                         }
1900                         if (pde)
1901                                 pde->rec_len =
1902                                         cpu_to_le16(le16_to_cpu(pde->rec_len) +
1903                                                     le16_to_cpu(de->rec_len));
1904                         else
1905                                 de->inode = 0;
1906                         dir->i_version++;
1907                         status = ocfs2_journal_dirty(handle, bh);
1908                         goto bail;
1909                 }
1910                 i += le16_to_cpu(de->rec_len);
1911                 pde = de;
1912                 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
1913         }
1914 bail:
1915         mlog_exit(status);
1916         return status;
1917 }
1918
1919 /*
1920  * Returns 0 if not found, -1 on failure, and 1 on success
1921  */
1922 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
1923                                         struct inode *dir,
1924                                         const char *name, int namelen,
1925                                         unsigned long offset,
1926                                         struct ocfs2_dir_entry **res_dir)
1927 {
1928         struct ocfs2_dir_entry *de;
1929         char *dlimit, *de_buf;
1930         int de_len;
1931         int ret = 0;
1932
1933         mlog_entry_void();
1934
1935         de_buf = bh->b_data;
1936         dlimit = de_buf + dir->i_sb->s_blocksize;
1937
1938         while (de_buf < dlimit) {
1939                 /* this code is executed quadratically often */
1940                 /* do minimal checking `by hand' */
1941
1942                 de = (struct ocfs2_dir_entry *) de_buf;
1943
1944                 if (de_buf + namelen <= dlimit &&
1945                     ocfs2_match(namelen, name, de)) {
1946                         /* found a match - just to be sure, do a full check */
1947                         if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
1948                                 ret = -1;
1949                                 goto bail;
1950                         }
1951                         *res_dir = de;
1952                         ret = 1;
1953                         goto bail;
1954                 }
1955
1956                 /* prevent looping on a bad block */
1957                 de_len = le16_to_cpu(de->rec_len);
1958                 if (de_len <= 0) {
1959                         ret = -1;
1960                         goto bail;
1961                 }
1962
1963                 de_buf += de_len;
1964                 offset += de_len;
1965         }
1966
1967 bail:
1968         mlog_exit(ret);
1969         return ret;
1970 }
1971
1972 struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
1973                                      struct inode *dir,
1974                                      struct ocfs2_dir_entry **res_dir)
1975 {
1976         struct super_block *sb;
1977         struct buffer_head *bh_use[NAMEI_RA_SIZE];
1978         struct buffer_head *bh, *ret = NULL;
1979         unsigned long start, block, b;
1980         int ra_max = 0;         /* Number of bh's in the readahead
1981                                    buffer, bh_use[] */
1982         int ra_ptr = 0;         /* Current index into readahead
1983                                    buffer */
1984         int num = 0;
1985         int nblocks, i, err;
1986
1987         mlog_entry_void();
1988
1989         *res_dir = NULL;
1990         sb = dir->i_sb;
1991
1992         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
1993         start = OCFS2_I(dir)->ip_dir_start_lookup;
1994         if (start >= nblocks)
1995                 start = 0;
1996         block = start;
1997
1998 restart:
1999         do {
2000                 /*
2001                  * We deal with the read-ahead logic here.
2002                  */
2003                 if (ra_ptr >= ra_max) {
2004                         /* Refill the readahead buffer */
2005                         ra_ptr = 0;
2006                         b = block;
2007                         for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
2008                                 /*
2009                                  * Terminate if we reach the end of the
2010                                  * directory and must wrap, or if our
2011                                  * search has finished at this block.
2012                                  */
2013                                 if (b >= nblocks || (num && block == start)) {
2014                                         bh_use[ra_max] = NULL;
2015                                         break;
2016                                 }
2017                                 num++;
2018
2019                                 bh = ocfs2_bread(dir, b++, &err, 1);
2020                                 bh_use[ra_max] = bh;
2021                         }
2022                 }
2023                 if ((bh = bh_use[ra_ptr++]) == NULL)
2024                         goto next;
2025                 wait_on_buffer(bh);
2026                 if (!buffer_uptodate(bh)) {
2027                         /* read error, skip block & hope for the best */
2028                         ocfs2_error(dir->i_sb, "reading directory %llu, "
2029                                     "offset %lu\n",
2030                                     (unsigned long long)OCFS2_I(dir)->ip_blkno,
2031                                     block);
2032                         brelse(bh);
2033                         goto next;
2034                 }
2035                 i = ocfs2_search_dirblock(bh, dir, name, namelen,
2036                                           block << sb->s_blocksize_bits,
2037                                           res_dir);
2038                 if (i == 1) {
2039                         OCFS2_I(dir)->ip_dir_start_lookup = block;
2040                         ret = bh;
2041                         goto cleanup_and_exit;
2042                 } else {
2043                         brelse(bh);
2044                         if (i < 0)
2045                                 goto cleanup_and_exit;
2046                 }
2047         next:
2048                 if (++block >= nblocks)
2049                         block = 0;
2050         } while (block != start);
2051
2052         /*
2053          * If the directory has grown while we were searching, then
2054          * search the last part of the directory before giving up.
2055          */
2056         block = nblocks;
2057         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2058         if (block < nblocks) {
2059                 start = 0;
2060                 goto restart;
2061         }
2062
2063 cleanup_and_exit:
2064         /* Clean up the read-ahead blocks */
2065         for (; ra_ptr < ra_max; ra_ptr++)
2066                 brelse(bh_use[ra_ptr]);
2067
2068         mlog_exit_ptr(ret);
2069         return ret;
2070 }
2071
2072 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2073 {
2074         int status, namelen;
2075
2076         mlog_entry_void();
2077
2078         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
2079                            (long long)blkno);
2080         if (namelen <= 0) {
2081                 if (namelen)
2082                         status = namelen;
2083                 else
2084                         status = -EINVAL;
2085                 mlog_errno(status);
2086                 goto bail;
2087         }
2088         if (namelen != OCFS2_ORPHAN_NAMELEN) {
2089                 status = -EINVAL;
2090                 mlog_errno(status);
2091                 goto bail;
2092         }
2093
2094         mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
2095              namelen);
2096
2097         status = 0;
2098 bail:
2099         mlog_exit(status);
2100         return status;
2101 }
2102
2103 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2104                                     struct inode **ret_orphan_dir,
2105                                     struct inode *inode,
2106                                     char *name,
2107                                     struct buffer_head **de_bh)
2108 {
2109         struct inode *orphan_dir_inode;
2110         struct buffer_head *orphan_dir_bh = NULL;
2111         int status = 0;
2112
2113         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2114         if (status < 0) {
2115                 mlog_errno(status);
2116                 return status;
2117         }
2118
2119         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2120                                                        ORPHAN_DIR_SYSTEM_INODE,
2121                                                        osb->slot_num);
2122         if (!orphan_dir_inode) {
2123                 status = -ENOENT;
2124                 mlog_errno(status);
2125                 return status;
2126         }
2127
2128         mutex_lock(&orphan_dir_inode->i_mutex);
2129
2130         status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2131         if (status < 0) {
2132                 mlog_errno(status);
2133                 goto leave;
2134         }
2135
2136         status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2137                                               orphan_dir_bh, name,
2138                                               OCFS2_ORPHAN_NAMELEN, de_bh);
2139         if (status < 0) {
2140                 ocfs2_meta_unlock(orphan_dir_inode, 1);
2141
2142                 mlog_errno(status);
2143                 goto leave;
2144         }
2145
2146         *ret_orphan_dir = orphan_dir_inode;
2147
2148 leave:
2149         if (status) {
2150                 mutex_unlock(&orphan_dir_inode->i_mutex);
2151                 iput(orphan_dir_inode);
2152         }
2153
2154         if (orphan_dir_bh)
2155                 brelse(orphan_dir_bh);
2156
2157         mlog_exit(status);
2158         return status;
2159 }
2160
2161 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2162                             struct ocfs2_journal_handle *handle,
2163                             struct inode *inode,
2164                             struct ocfs2_dinode *fe,
2165                             char *name,
2166                             struct buffer_head *de_bh,
2167                             struct inode *orphan_dir_inode)
2168 {
2169         struct buffer_head *orphan_dir_bh = NULL;
2170         int status = 0;
2171         struct ocfs2_dinode *orphan_fe;
2172
2173         mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
2174
2175         status = ocfs2_read_block(osb,
2176                                   OCFS2_I(orphan_dir_inode)->ip_blkno,
2177                                   &orphan_dir_bh, OCFS2_BH_CACHED,
2178                                   orphan_dir_inode);
2179         if (status < 0) {
2180                 mlog_errno(status);
2181                 goto leave;
2182         }
2183
2184         status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
2185                                       OCFS2_JOURNAL_ACCESS_WRITE);
2186         if (status < 0) {
2187                 mlog_errno(status);
2188                 goto leave;
2189         }
2190
2191         /* we're a cluster, and nlink can change on disk from
2192          * underneath us... */
2193         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2194         if (S_ISDIR(inode->i_mode))
2195                 le16_add_cpu(&orphan_fe->i_links_count, 1);
2196         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2197
2198         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2199         if (status < 0) {
2200                 mlog_errno(status);
2201                 goto leave;
2202         }
2203
2204         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2205                                    OCFS2_ORPHAN_NAMELEN, inode,
2206                                    OCFS2_I(inode)->ip_blkno,
2207                                    orphan_dir_bh, de_bh);
2208         if (status < 0) {
2209                 mlog_errno(status);
2210                 goto leave;
2211         }
2212
2213         le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2214
2215         /* Record which orphan dir our inode now resides
2216          * in. delete_inode will use this to determine which orphan
2217          * dir to lock. */
2218         spin_lock(&OCFS2_I(inode)->ip_lock);
2219         OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num;
2220         spin_unlock(&OCFS2_I(inode)->ip_lock);
2221
2222         mlog(0, "Inode %llu orphaned in slot %d\n",
2223              (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
2224
2225 leave:
2226         if (orphan_dir_bh)
2227                 brelse(orphan_dir_bh);
2228
2229         mlog_exit(status);
2230         return status;
2231 }
2232
2233 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2234 int ocfs2_orphan_del(struct ocfs2_super *osb,
2235                      struct ocfs2_journal_handle *handle,
2236                      struct inode *orphan_dir_inode,
2237                      struct inode *inode,
2238                      struct buffer_head *orphan_dir_bh)
2239 {
2240         char name[OCFS2_ORPHAN_NAMELEN + 1];
2241         struct ocfs2_dinode *orphan_fe;
2242         int status = 0;
2243         struct buffer_head *target_de_bh = NULL;
2244         struct ocfs2_dir_entry *target_de = NULL;
2245
2246         mlog_entry_void();
2247
2248         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2249         if (status < 0) {
2250                 mlog_errno(status);
2251                 goto leave;
2252         }
2253
2254         mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
2255              name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2256              OCFS2_ORPHAN_NAMELEN);
2257
2258         /* find it's spot in the orphan directory */
2259         target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
2260                                         orphan_dir_inode, &target_de);
2261         if (!target_de_bh) {
2262                 status = -ENOENT;
2263                 mlog_errno(status);
2264                 goto leave;
2265         }
2266
2267         /* remove it from the orphan directory */
2268         status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
2269                                     target_de_bh);
2270         if (status < 0) {
2271                 mlog_errno(status);
2272                 goto leave;
2273         }
2274
2275         status = ocfs2_journal_access(handle,orphan_dir_inode,  orphan_dir_bh,
2276                                       OCFS2_JOURNAL_ACCESS_WRITE);
2277         if (status < 0) {
2278                 mlog_errno(status);
2279                 goto leave;
2280         }
2281
2282         /* do the i_nlink dance! :) */
2283         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2284         if (S_ISDIR(inode->i_mode))
2285                 le16_add_cpu(&orphan_fe->i_links_count, -1);
2286         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2287
2288         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2289         if (status < 0) {
2290                 mlog_errno(status);
2291                 goto leave;
2292         }
2293
2294 leave:
2295         if (target_de_bh)
2296                 brelse(target_de_bh);
2297
2298         mlog_exit(status);
2299         return status;
2300 }
2301
2302 struct inode_operations ocfs2_dir_iops = {
2303         .create         = ocfs2_create,
2304         .lookup         = ocfs2_lookup,
2305         .link           = ocfs2_link,
2306         .unlink         = ocfs2_unlink,
2307         .rmdir          = ocfs2_unlink,
2308         .symlink        = ocfs2_symlink,
2309         .mkdir          = ocfs2_mkdir,
2310         .mknod          = ocfs2_mknod,
2311         .rename         = ocfs2_rename,
2312         .setattr        = ocfs2_setattr,
2313         .getattr        = ocfs2_getattr,
2314 };