git.oblomov.eu Git - linux-2.6/blob - fs/ocfs2/namei.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * namei.c
   5  *
   6  * Create and rename file, directory, symlinks
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  *  Portions of this code from linux/fs/ext3/dir.c
  11  *
  12  *  Copyright (C) 1992, 1993, 1994, 1995
  13  *  Remy Card (card@masi.ibp.fr)
  14  *  Laboratoire MASI - Institut Blaise pascal
  15  *  Universite Pierre et Marie Curie (Paris VI)
  16  *
  17  *   from
  18  *
  19  *   linux/fs/minix/dir.c
  20  *
  21  *   Copyright (C) 1991, 1992 Linux Torvalds
  22  *
  23  * This program is free software; you can redistribute it and/or
  24  * modify it under the terms of the GNU General Public
  25  * License as published by the Free Software Foundation; either
  26  * version 2 of the License, or (at your option) any later version.
  27  *
  28  * This program is distributed in the hope that it will be useful,
  29  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  30  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  31  * General Public License for more details.
  32  *
  33  * You should have received a copy of the GNU General Public
  34  * License along with this program; if not, write to the
  35  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  36  * Boston, MA 021110-1307, USA.
  37  */
  38
  39 #include <linux/fs.h>
  40 #include <linux/types.h>
  41 #include <linux/slab.h>
  42 #include <linux/highmem.h>
  43
  44 #define MLOG_MASK_PREFIX ML_NAMEI
  45 #include <cluster/masklog.h>
  46
  47 #include "ocfs2.h"
  48
  49 #include "alloc.h"
  50 #include "dcache.h"
  51 #include "dir.h"
  52 #include "dlmglue.h"
  53 #include "extent_map.h"
  54 #include "file.h"
  55 #include "inode.h"
  56 #include "journal.h"
  57 #include "namei.h"
  58 #include "suballoc.h"
  59 #include "super.h"
  60 #include "symlink.h"
  61 #include "sysfile.h"
  62 #include "uptodate.h"
  63 #include "vote.h"
  64
  65 #include "buffer_head_io.h"
  66
  67 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
  68                               struct inode *dir,
  69                               struct dentry *dentry, int mode,
  70                               dev_t dev,
  71                               struct buffer_head **new_fe_bh,
  72                               struct buffer_head *parent_fe_bh,
  73                               handle_t *handle,
  74                               struct inode **ret_inode,
  75                               struct ocfs2_alloc_context *inode_ac);
  76
  77 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
  78                                     struct inode **ret_orphan_dir,
  79                                     struct inode *inode,
  80                                     char *name,
  81                                     struct buffer_head **de_bh);
  82
  83 static int ocfs2_orphan_add(struct ocfs2_super *osb,
  84                             handle_t *handle,
  85                             struct inode *inode,
  86                             struct ocfs2_dinode *fe,
  87                             char *name,
  88                             struct buffer_head *de_bh,
  89                             struct inode *orphan_dir_inode);
  90
  91 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
  92                                      handle_t *handle,
  93                                      struct inode *inode,
  94                                      const char *symname);
  95
  96 /* An orphan dir name is an 8 byte value, printed as a hex string */
  97 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
  98
  99 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
 100                                    struct nameidata *nd)
 101 {
 102         int status;
 103         u64 blkno;
 104         struct inode *inode = NULL;
 105         struct dentry *ret;
 106         struct ocfs2_inode_info *oi;
 107
 108         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 109                    dentry->d_name.len, dentry->d_name.name);
 110
 111         if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
 112                 ret = ERR_PTR(-ENAMETOOLONG);
 113                 goto bail;
 114         }
 115
 116         mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len,
 117              dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno);
 118
 119         status = ocfs2_meta_lock(dir, NULL, 0);
 120         if (status < 0) {
 121                 if (status != -ENOENT)
 122                         mlog_errno(status);
 123                 ret = ERR_PTR(status);
 124                 goto bail;
 125         }
 126
 127         status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
 128                                             dentry->d_name.len, &blkno);
 129         if (status < 0)
 130                 goto bail_add;
 131
 132         inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0);
 133         if (IS_ERR(inode)) {
 134                 ret = ERR_PTR(-EACCES);
 135                 goto bail_unlock;
 136         }
 137
 138         oi = OCFS2_I(inode);
 139         /* Clear any orphaned state... If we were able to look up the
 140          * inode from a directory, it certainly can't be orphaned. We
 141          * might have the bad state from a node which intended to
 142          * orphan this inode but crashed before it could commit the
 143          * unlink. */
 144         spin_lock(&oi->ip_lock);
 145         oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
 146         spin_unlock(&oi->ip_lock);
 147
 148 bail_add:
 149         dentry->d_op = &ocfs2_dentry_ops;
 150         ret = d_splice_alias(inode, dentry);
 151
 152         if (inode) {
 153                 /*
 154                  * If d_splice_alias() finds a DCACHE_DISCONNECTED
 155                  * dentry, it will d_move() it on top of ourse. The
 156                  * return value will indicate this however, so in
 157                  * those cases, we switch them around for the locking
 158                  * code.
 159                  *
 160                  * NOTE: This dentry already has ->d_op set from
 161                  * ocfs2_get_parent() and ocfs2_get_dentry()
 162                  */
 163                 if (ret)
 164                         dentry = ret;
 165
 166                 status = ocfs2_dentry_attach_lock(dentry, inode,
 167                                                   OCFS2_I(dir)->ip_blkno);
 168                 if (status) {
 169                         mlog_errno(status);
 170                         ret = ERR_PTR(status);
 171                         goto bail_unlock;
 172                 }
 173         }
 174
 175 bail_unlock:
 176         /* Don't drop the cluster lock until *after* the d_add --
 177          * unlink on another node will message us to remove that
 178          * dentry under this lock so otherwise we can race this with
 179          * the vote thread and have a stale dentry. */
 180         ocfs2_meta_unlock(dir, 0);
 181
 182 bail:
 183
 184         mlog_exit_ptr(ret);
 185
 186         return ret;
 187 }
 188
 189 static int ocfs2_mknod(struct inode *dir,
 190                        struct dentry *dentry,
 191                        int mode,
 192                        dev_t dev)
 193 {
 194         int status = 0;
 195         struct buffer_head *parent_fe_bh = NULL;
 196         handle_t *handle = NULL;
 197         struct ocfs2_super *osb;
 198         struct ocfs2_dinode *dirfe;
 199         struct buffer_head *new_fe_bh = NULL;
 200         struct buffer_head *de_bh = NULL;
 201         struct inode *inode = NULL;
 202         struct ocfs2_alloc_context *inode_ac = NULL;
 203         struct ocfs2_alloc_context *data_ac = NULL;
 204
 205         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 206                    (unsigned long)dev, dentry->d_name.len,
 207                    dentry->d_name.name);
 208
 209         /* get our super block */
 210         osb = OCFS2_SB(dir->i_sb);
 211
 212         status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
 213         if (status < 0) {
 214                 if (status != -ENOENT)
 215                         mlog_errno(status);
 216                 return status;
 217         }
 218
 219         if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
 220                 status = -EMLINK;
 221                 goto leave;
 222         }
 223
 224         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
 225         if (!dirfe->i_links_count) {
 226                 /* can't make a file in a deleted directory. */
 227                 status = -ENOENT;
 228                 goto leave;
 229         }
 230
 231         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 232                                            dentry->d_name.len);
 233         if (status)
 234                 goto leave;
 235
 236         /* get a spot inside the dir. */
 237         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 238                                               dentry->d_name.name,
 239                                               dentry->d_name.len, &de_bh);
 240         if (status < 0) {
 241                 mlog_errno(status);
 242                 goto leave;
 243         }
 244
 245         /* reserve an inode spot */
 246         status = ocfs2_reserve_new_inode(osb, &inode_ac);
 247         if (status < 0) {
 248                 if (status != -ENOSPC)
 249                         mlog_errno(status);
 250                 goto leave;
 251         }
 252
 253         /* Reserve a cluster if creating an extent based directory. */
 254         if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
 255                 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
 256                 if (status < 0) {
 257                         if (status != -ENOSPC)
 258                                 mlog_errno(status);
 259                         goto leave;
 260                 }
 261         }
 262
 263         handle = ocfs2_start_trans(osb, OCFS2_MKNOD_CREDITS);
 264         if (IS_ERR(handle)) {
 265                 status = PTR_ERR(handle);
 266                 handle = NULL;
 267                 mlog_errno(status);
 268                 goto leave;
 269         }
 270
 271         /* do the real work now. */
 272         status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
 273                                     &new_fe_bh, parent_fe_bh, handle,
 274                                     &inode, inode_ac);
 275         if (status < 0) {
 276                 mlog_errno(status);
 277                 goto leave;
 278         }
 279
 280         if (S_ISDIR(mode)) {
 281                 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
 282                                             new_fe_bh, data_ac);
 283                 if (status < 0) {
 284                         mlog_errno(status);
 285                         goto leave;
 286                 }
 287
 288                 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
 289                                               OCFS2_JOURNAL_ACCESS_WRITE);
 290                 if (status < 0) {
 291                         mlog_errno(status);
 292                         goto leave;
 293                 }
 294                 le16_add_cpu(&dirfe->i_links_count, 1);
 295                 status = ocfs2_journal_dirty(handle, parent_fe_bh);
 296                 if (status < 0) {
 297                         mlog_errno(status);
 298                         goto leave;
 299                 }
 300                 inc_nlink(dir);
 301         }
 302
 303         status = ocfs2_add_entry(handle, dentry, inode,
 304                                  OCFS2_I(inode)->ip_blkno, parent_fe_bh,
 305                                  de_bh);
 306         if (status < 0) {
 307                 mlog_errno(status);
 308                 goto leave;
 309         }
 310
 311         status = ocfs2_dentry_attach_lock(dentry, inode,
 312                                           OCFS2_I(dir)->ip_blkno);
 313         if (status) {
 314                 mlog_errno(status);
 315                 goto leave;
 316         }
 317
 318         insert_inode_hash(inode);
 319         dentry->d_op = &ocfs2_dentry_ops;
 320         d_instantiate(dentry, inode);
 321         status = 0;
 322 leave:
 323         if (handle)
 324                 ocfs2_commit_trans(osb, handle);
 325
 326         ocfs2_meta_unlock(dir, 1);
 327
 328         if (status == -ENOSPC)
 329                 mlog(0, "Disk is full\n");
 330
 331         if (new_fe_bh)
 332                 brelse(new_fe_bh);
 333
 334         if (de_bh)
 335                 brelse(de_bh);
 336
 337         if (parent_fe_bh)
 338                 brelse(parent_fe_bh);
 339
 340         if ((status < 0) && inode)
 341                 iput(inode);
 342
 343         if (inode_ac)
 344                 ocfs2_free_alloc_context(inode_ac);
 345
 346         if (data_ac)
 347                 ocfs2_free_alloc_context(data_ac);
 348
 349         mlog_exit(status);
 350
 351         return status;
 352 }
 353
 354 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 355                               struct inode *dir,
 356                               struct dentry *dentry, int mode,
 357                               dev_t dev,
 358                               struct buffer_head **new_fe_bh,
 359                               struct buffer_head *parent_fe_bh,
 360                               handle_t *handle,
 361                               struct inode **ret_inode,
 362                               struct ocfs2_alloc_context *inode_ac)
 363 {
 364         int status = 0;
 365         struct ocfs2_dinode *fe = NULL;
 366         struct ocfs2_extent_list *fel;
 367         u64 fe_blkno = 0;
 368         u16 suballoc_bit;
 369         struct inode *inode = NULL;
 370
 371         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 372                    (unsigned long)dev, dentry->d_name.len,
 373                    dentry->d_name.name);
 374
 375         *new_fe_bh = NULL;
 376         *ret_inode = NULL;
 377
 378         status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
 379                                        &fe_blkno);
 380         if (status < 0) {
 381                 mlog_errno(status);
 382                 goto leave;
 383         }
 384
 385         inode = new_inode(dir->i_sb);
 386         if (IS_ERR(inode)) {
 387                 status = PTR_ERR(inode);
 388                 mlog(ML_ERROR, "new_inode failed!\n");
 389                 goto leave;
 390         }
 391
 392         /* populate as many fields early on as possible - many of
 393          * these are used by the support functions here and in
 394          * callers. */
 395         inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
 396         OCFS2_I(inode)->ip_blkno = fe_blkno;
 397         if (S_ISDIR(mode))
 398                 inode->i_nlink = 2;
 399         else
 400                 inode->i_nlink = 1;
 401         inode->i_mode = mode;
 402         spin_lock(&osb->osb_lock);
 403         inode->i_generation = osb->s_next_generation++;
 404         spin_unlock(&osb->osb_lock);
 405
 406         *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
 407         if (!*new_fe_bh) {
 408                 status = -EIO;
 409                 mlog_errno(status);
 410                 goto leave;
 411         }
 412         ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
 413
 414         status = ocfs2_journal_access(handle, inode, *new_fe_bh,
 415                                       OCFS2_JOURNAL_ACCESS_CREATE);
 416         if (status < 0) {
 417                 mlog_errno(status);
 418                 goto leave;
 419         }
 420
 421         fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
 422         memset(fe, 0, osb->sb->s_blocksize);
 423
 424         fe->i_generation = cpu_to_le32(inode->i_generation);
 425         fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
 426         fe->i_blkno = cpu_to_le64(fe_blkno);
 427         fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
 428         fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
 429         fe->i_uid = cpu_to_le32(current->fsuid);
 430         if (dir->i_mode & S_ISGID) {
 431                 fe->i_gid = cpu_to_le32(dir->i_gid);
 432                 if (S_ISDIR(mode))
 433                         mode |= S_ISGID;
 434         } else
 435                 fe->i_gid = cpu_to_le32(current->fsgid);
 436         fe->i_mode = cpu_to_le16(mode);
 437         if (S_ISCHR(mode) || S_ISBLK(mode))
 438                 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
 439
 440         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 441
 442         fe->i_last_eb_blk = 0;
 443         strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
 444         le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
 445         fe->i_atime = fe->i_ctime = fe->i_mtime =
 446                 cpu_to_le64(CURRENT_TIME.tv_sec);
 447         fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
 448                 cpu_to_le32(CURRENT_TIME.tv_nsec);
 449         fe->i_dtime = 0;
 450
 451         /*
 452          * If supported, directories start with inline data.
 453          */
 454         if (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) {
 455                 u16 feat = le16_to_cpu(fe->i_dyn_features);
 456
 457                 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
 458
 459                 fe->id2.i_data.id_count = cpu_to_le16(ocfs2_max_inline_data(osb->sb));
 460         } else {
 461                 fel = &fe->id2.i_list;
 462                 fel->l_tree_depth = 0;
 463                 fel->l_next_free_rec = 0;
 464                 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
 465         }
 466
 467         status = ocfs2_journal_dirty(handle, *new_fe_bh);
 468         if (status < 0) {
 469                 mlog_errno(status);
 470                 goto leave;
 471         }
 472
 473         if (ocfs2_populate_inode(inode, fe, 1) < 0) {
 474                 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
 475                      "i_blkno=%llu, i_ino=%lu\n",
 476                      (unsigned long long)(*new_fe_bh)->b_blocknr,
 477                      (unsigned long long)le64_to_cpu(fe->i_blkno),
 478                      inode->i_ino);
 479                 BUG();
 480         }
 481
 482         ocfs2_inode_set_new(osb, inode);
 483         if (!ocfs2_mount_local(osb)) {
 484                 status = ocfs2_create_new_inode_locks(inode);
 485                 if (status < 0)
 486                         mlog_errno(status);
 487         }
 488
 489         status = 0; /* error in ocfs2_create_new_inode_locks is not
 490                      * critical */
 491
 492         *ret_inode = inode;
 493 leave:
 494         if (status < 0) {
 495                 if (*new_fe_bh) {
 496                         brelse(*new_fe_bh);
 497                         *new_fe_bh = NULL;
 498                 }
 499                 if (inode)
 500                         iput(inode);
 501         }
 502
 503         mlog_exit(status);
 504         return status;
 505 }
 506
 507 static int ocfs2_mkdir(struct inode *dir,
 508                        struct dentry *dentry,
 509                        int mode)
 510 {
 511         int ret;
 512
 513         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 514                    dentry->d_name.len, dentry->d_name.name);
 515         ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
 516         mlog_exit(ret);
 517
 518         return ret;
 519 }
 520
 521 static int ocfs2_create(struct inode *dir,
 522                         struct dentry *dentry,
 523                         int mode,
 524                         struct nameidata *nd)
 525 {
 526         int ret;
 527
 528         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 529                    dentry->d_name.len, dentry->d_name.name);
 530         ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
 531         mlog_exit(ret);
 532
 533         return ret;
 534 }
 535
 536 static int ocfs2_link(struct dentry *old_dentry,
 537                       struct inode *dir,
 538                       struct dentry *dentry)
 539 {
 540         handle_t *handle;
 541         struct inode *inode = old_dentry->d_inode;
 542         int err;
 543         struct buffer_head *fe_bh = NULL;
 544         struct buffer_head *parent_fe_bh = NULL;
 545         struct buffer_head *de_bh = NULL;
 546         struct ocfs2_dinode *fe = NULL;
 547         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 548
 549         mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
 550                    old_dentry->d_name.len, old_dentry->d_name.name,
 551                    dentry->d_name.len, dentry->d_name.name);
 552
 553         if (S_ISDIR(inode->i_mode))
 554                 return -EPERM;
 555
 556         err = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
 557         if (err < 0) {
 558                 if (err != -ENOENT)
 559                         mlog_errno(err);
 560                 return err;
 561         }
 562
 563         if (!dir->i_nlink) {
 564                 err = -ENOENT;
 565                 goto out;
 566         }
 567
 568         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 569                                         dentry->d_name.len);
 570         if (err)
 571                 goto out;
 572
 573         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 574                                            dentry->d_name.name,
 575                                            dentry->d_name.len, &de_bh);
 576         if (err < 0) {
 577                 mlog_errno(err);
 578                 goto out;
 579         }
 580
 581         err = ocfs2_meta_lock(inode, &fe_bh, 1);
 582         if (err < 0) {
 583                 if (err != -ENOENT)
 584                         mlog_errno(err);
 585                 goto out;
 586         }
 587
 588         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 589         if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
 590                 err = -EMLINK;
 591                 goto out_unlock_inode;
 592         }
 593
 594         handle = ocfs2_start_trans(osb, OCFS2_LINK_CREDITS);
 595         if (IS_ERR(handle)) {
 596                 err = PTR_ERR(handle);
 597                 handle = NULL;
 598                 mlog_errno(err);
 599                 goto out_unlock_inode;
 600         }
 601
 602         err = ocfs2_journal_access(handle, inode, fe_bh,
 603                                    OCFS2_JOURNAL_ACCESS_WRITE);
 604         if (err < 0) {
 605                 mlog_errno(err);
 606                 goto out_commit;
 607         }
 608
 609         inc_nlink(inode);
 610         inode->i_ctime = CURRENT_TIME;
 611         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 612         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 613         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 614
 615         err = ocfs2_journal_dirty(handle, fe_bh);
 616         if (err < 0) {
 617                 le16_add_cpu(&fe->i_links_count, -1);
 618                 drop_nlink(inode);
 619                 mlog_errno(err);
 620                 goto out_commit;
 621         }
 622
 623         err = ocfs2_add_entry(handle, dentry, inode,
 624                               OCFS2_I(inode)->ip_blkno,
 625                               parent_fe_bh, de_bh);
 626         if (err) {
 627                 le16_add_cpu(&fe->i_links_count, -1);
 628                 drop_nlink(inode);
 629                 mlog_errno(err);
 630                 goto out_commit;
 631         }
 632
 633         err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
 634         if (err) {
 635                 mlog_errno(err);
 636                 goto out_commit;
 637         }
 638
 639         atomic_inc(&inode->i_count);
 640         dentry->d_op = &ocfs2_dentry_ops;
 641         d_instantiate(dentry, inode);
 642
 643 out_commit:
 644         ocfs2_commit_trans(osb, handle);
 645 out_unlock_inode:
 646         ocfs2_meta_unlock(inode, 1);
 647
 648 out:
 649         ocfs2_meta_unlock(dir, 1);
 650
 651         if (de_bh)
 652                 brelse(de_bh);
 653         if (fe_bh)
 654                 brelse(fe_bh);
 655         if (parent_fe_bh)
 656                 brelse(parent_fe_bh);
 657
 658         mlog_exit(err);
 659
 660         return err;
 661 }
 662
 663 /*
 664  * Takes and drops an exclusive lock on the given dentry. This will
 665  * force other nodes to drop it.
 666  */
 667 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
 668 {
 669         int ret;
 670
 671         ret = ocfs2_dentry_lock(dentry, 1);
 672         if (ret)
 673                 mlog_errno(ret);
 674         else
 675                 ocfs2_dentry_unlock(dentry, 1);
 676
 677         return ret;
 678 }
 679
 680 static inline int inode_is_unlinkable(struct inode *inode)
 681 {
 682         if (S_ISDIR(inode->i_mode)) {
 683                 if (inode->i_nlink == 2)
 684                         return 1;
 685                 return 0;
 686         }
 687
 688         if (inode->i_nlink == 1)
 689                 return 1;
 690         return 0;
 691 }
 692
 693 static int ocfs2_unlink(struct inode *dir,
 694                         struct dentry *dentry)
 695 {
 696         int status;
 697         int child_locked = 0;
 698         struct inode *inode = dentry->d_inode;
 699         struct inode *orphan_dir = NULL;
 700         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 701         u64 blkno;
 702         struct ocfs2_dinode *fe = NULL;
 703         struct buffer_head *fe_bh = NULL;
 704         struct buffer_head *parent_node_bh = NULL;
 705         handle_t *handle = NULL;
 706         struct ocfs2_dir_entry *dirent = NULL;
 707         struct buffer_head *dirent_bh = NULL;
 708         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
 709         struct buffer_head *orphan_entry_bh = NULL;
 710
 711         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 712                    dentry->d_name.len, dentry->d_name.name);
 713
 714         BUG_ON(dentry->d_parent->d_inode != dir);
 715
 716         mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
 717
 718         if (inode == osb->root_inode) {
 719                 mlog(0, "Cannot delete the root directory\n");
 720                 return -EPERM;
 721         }
 722
 723         status = ocfs2_meta_lock(dir, &parent_node_bh, 1);
 724         if (status < 0) {
 725                 if (status != -ENOENT)
 726                         mlog_errno(status);
 727                 return status;
 728         }
 729
 730         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 731                                           dentry->d_name.len, &blkno,
 732                                           dir, &dirent_bh, &dirent);
 733         if (status < 0) {
 734                 if (status != -ENOENT)
 735                         mlog_errno(status);
 736                 goto leave;
 737         }
 738
 739         if (OCFS2_I(inode)->ip_blkno != blkno) {
 740                 status = -ENOENT;
 741
 742                 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
 743                      (unsigned long long)OCFS2_I(inode)->ip_blkno,
 744                      (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
 745                 goto leave;
 746         }
 747
 748         status = ocfs2_meta_lock(inode, &fe_bh, 1);
 749         if (status < 0) {
 750                 if (status != -ENOENT)
 751                         mlog_errno(status);
 752                 goto leave;
 753         }
 754         child_locked = 1;
 755
 756         if (S_ISDIR(inode->i_mode)) {
 757                 if (!ocfs2_empty_dir(inode)) {
 758                         status = -ENOTEMPTY;
 759                         goto leave;
 760                 } else if (inode->i_nlink != 2) {
 761                         status = -ENOTEMPTY;
 762                         goto leave;
 763                 }
 764         }
 765
 766         status = ocfs2_remote_dentry_delete(dentry);
 767         if (status < 0) {
 768                 /* This vote should succeed under all normal
 769                  * circumstances. */
 770                 mlog_errno(status);
 771                 goto leave;
 772         }
 773
 774         if (inode_is_unlinkable(inode)) {
 775                 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
 776                                                   orphan_name,
 777                                                   &orphan_entry_bh);
 778                 if (status < 0) {
 779                         mlog_errno(status);
 780                         goto leave;
 781                 }
 782         }
 783
 784         handle = ocfs2_start_trans(osb, OCFS2_UNLINK_CREDITS);
 785         if (IS_ERR(handle)) {
 786                 status = PTR_ERR(handle);
 787                 handle = NULL;
 788                 mlog_errno(status);
 789                 goto leave;
 790         }
 791
 792         status = ocfs2_journal_access(handle, inode, fe_bh,
 793                                       OCFS2_JOURNAL_ACCESS_WRITE);
 794         if (status < 0) {
 795                 mlog_errno(status);
 796                 goto leave;
 797         }
 798
 799         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 800
 801         if (inode_is_unlinkable(inode)) {
 802                 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
 803                                           orphan_entry_bh, orphan_dir);
 804                 if (status < 0) {
 805                         mlog_errno(status);
 806                         goto leave;
 807                 }
 808         }
 809
 810         /* delete the name from the parent dir */
 811         status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
 812         if (status < 0) {
 813                 mlog_errno(status);
 814                 goto leave;
 815         }
 816
 817         if (S_ISDIR(inode->i_mode))
 818                 drop_nlink(inode);
 819         drop_nlink(inode);
 820         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 821
 822         status = ocfs2_journal_dirty(handle, fe_bh);
 823         if (status < 0) {
 824                 mlog_errno(status);
 825                 goto leave;
 826         }
 827
 828         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 829         if (S_ISDIR(inode->i_mode))
 830                 drop_nlink(dir);
 831
 832         status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
 833         if (status < 0) {
 834                 mlog_errno(status);
 835                 if (S_ISDIR(inode->i_mode))
 836                         inc_nlink(dir);
 837         }
 838
 839 leave:
 840         if (handle)
 841                 ocfs2_commit_trans(osb, handle);
 842
 843         if (child_locked)
 844                 ocfs2_meta_unlock(inode, 1);
 845
 846         ocfs2_meta_unlock(dir, 1);
 847
 848         if (orphan_dir) {
 849                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
 850                 ocfs2_meta_unlock(orphan_dir, 1);
 851                 mutex_unlock(&orphan_dir->i_mutex);
 852                 iput(orphan_dir);
 853         }
 854
 855         if (fe_bh)
 856                 brelse(fe_bh);
 857
 858         if (dirent_bh)
 859                 brelse(dirent_bh);
 860
 861         if (parent_node_bh)
 862                 brelse(parent_node_bh);
 863
 864         if (orphan_entry_bh)
 865                 brelse(orphan_entry_bh);
 866
 867         mlog_exit(status);
 868
 869         return status;
 870 }
 871
 872 /*
 873  * The only place this should be used is rename!
 874  * if they have the same id, then the 1st one is the only one locked.
 875  */
 876 static int ocfs2_double_lock(struct ocfs2_super *osb,
 877                              struct buffer_head **bh1,
 878                              struct inode *inode1,
 879                              struct buffer_head **bh2,
 880                              struct inode *inode2)
 881 {
 882         int status;
 883         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
 884         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
 885         struct buffer_head **tmpbh;
 886         struct inode *tmpinode;
 887
 888         mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
 889                    (unsigned long long)oi1->ip_blkno,
 890                    (unsigned long long)oi2->ip_blkno);
 891
 892         if (*bh1)
 893                 *bh1 = NULL;
 894         if (*bh2)
 895                 *bh2 = NULL;
 896
 897         /* we always want to lock the one with the lower lockid first. */
 898         if (oi1->ip_blkno != oi2->ip_blkno) {
 899                 if (oi1->ip_blkno < oi2->ip_blkno) {
 900                         /* switch id1 and id2 around */
 901                         mlog(0, "switching them around...\n");
 902                         tmpbh = bh2;
 903                         bh2 = bh1;
 904                         bh1 = tmpbh;
 905
 906                         tmpinode = inode2;
 907                         inode2 = inode1;
 908                         inode1 = tmpinode;
 909                 }
 910                 /* lock id2 */
 911                 status = ocfs2_meta_lock(inode2, bh2, 1);
 912                 if (status < 0) {
 913                         if (status != -ENOENT)
 914                                 mlog_errno(status);
 915                         goto bail;
 916                 }
 917         }
 918
 919         /* lock id1 */
 920         status = ocfs2_meta_lock(inode1, bh1, 1);
 921         if (status < 0) {
 922                 /*
 923                  * An error return must mean that no cluster locks
 924                  * were held on function exit.
 925                  */
 926                 if (oi1->ip_blkno != oi2->ip_blkno)
 927                         ocfs2_meta_unlock(inode2, 1);
 928
 929                 if (status != -ENOENT)
 930                         mlog_errno(status);
 931         }
 932
 933 bail:
 934         mlog_exit(status);
 935         return status;
 936 }
 937
 938 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
 939 {
 940         ocfs2_meta_unlock(inode1, 1);
 941
 942         if (inode1 != inode2)
 943                 ocfs2_meta_unlock(inode2, 1);
 944 }
 945
 946 static int ocfs2_rename(struct inode *old_dir,
 947                         struct dentry *old_dentry,
 948                         struct inode *new_dir,
 949                         struct dentry *new_dentry)
 950 {
 951         int status = 0, rename_lock = 0, parents_locked = 0;
 952         int old_child_locked = 0, new_child_locked = 0;
 953         struct inode *old_inode = old_dentry->d_inode;
 954         struct inode *new_inode = new_dentry->d_inode;
 955         struct inode *orphan_dir = NULL;
 956         struct ocfs2_dinode *newfe = NULL;
 957         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
 958         struct buffer_head *orphan_entry_bh = NULL;
 959         struct buffer_head *newfe_bh = NULL;
 960         struct buffer_head *old_inode_bh = NULL;
 961         struct buffer_head *insert_entry_bh = NULL;
 962         struct ocfs2_super *osb = NULL;
 963         u64 newfe_blkno, old_de_ino;
 964         handle_t *handle = NULL;
 965         struct buffer_head *old_dir_bh = NULL;
 966         struct buffer_head *new_dir_bh = NULL;
 967         struct ocfs2_dir_entry *old_inode_dot_dot_de = NULL, *old_de = NULL,
 968                 *new_de = NULL;
 969         struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
 970         struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
 971                                                     // this is the 1st dirent bh
 972         nlink_t old_dir_nlink = old_dir->i_nlink;
 973         struct ocfs2_dinode *old_di;
 974
 975         /* At some point it might be nice to break this function up a
 976          * bit. */
 977
 978         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
 979                    old_dir, old_dentry, new_dir, new_dentry,
 980                    old_dentry->d_name.len, old_dentry->d_name.name,
 981                    new_dentry->d_name.len, new_dentry->d_name.name);
 982
 983         osb = OCFS2_SB(old_dir->i_sb);
 984
 985         if (new_inode) {
 986                 if (!igrab(new_inode))
 987                         BUG();
 988         }
 989
 990         /* Assume a directory hierarchy thusly:
 991          * a/b/c
 992          * a/d
 993          * a,b,c, and d are all directories.
 994          *
 995          * from cwd of 'a' on both nodes:
 996          * node1: mv b/c d
 997          * node2: mv d   b/c
 998          *
 999          * And that's why, just like the VFS, we need a file system
1000          * rename lock. */
1001         if (old_dentry != new_dentry) {
1002                 status = ocfs2_rename_lock(osb);
1003                 if (status < 0) {
1004                         mlog_errno(status);
1005                         goto bail;
1006                 }
1007                 rename_lock = 1;
1008         }
1009
1010         /* if old and new are the same, this'll just do one lock. */
1011         status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1012                                    &new_dir_bh, new_dir);
1013         if (status < 0) {
1014                 mlog_errno(status);
1015                 goto bail;
1016         }
1017         parents_locked = 1;
1018
1019         /* make sure both dirs have bhs
1020          * get an extra ref on old_dir_bh if old==new */
1021         if (!new_dir_bh) {
1022                 if (old_dir_bh) {
1023                         new_dir_bh = old_dir_bh;
1024                         get_bh(new_dir_bh);
1025                 } else {
1026                         mlog(ML_ERROR, "no old_dir_bh!\n");
1027                         status = -EIO;
1028                         goto bail;
1029                 }
1030         }
1031
1032         /*
1033          * Aside from allowing a meta data update, the locking here
1034          * also ensures that the vote thread on other nodes won't have
1035          * to concurrently downconvert the inode and the dentry locks.
1036          */
1037         status = ocfs2_meta_lock(old_inode, &old_inode_bh, 1);
1038         if (status < 0) {
1039                 if (status != -ENOENT)
1040                         mlog_errno(status);
1041                 goto bail;
1042         }
1043         old_child_locked = 1;
1044
1045         status = ocfs2_remote_dentry_delete(old_dentry);
1046         if (status < 0) {
1047                 mlog_errno(status);
1048                 goto bail;
1049         }
1050
1051         if (S_ISDIR(old_inode->i_mode)) {
1052                 u64 old_inode_parent;
1053
1054                 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1055                                                   old_inode, &old_inode_de_bh,
1056                                                   &old_inode_dot_dot_de);
1057                 if (status) {
1058                         status = -EIO;
1059                         goto bail;
1060                 }
1061
1062                 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1063                         status = -EIO;
1064                         goto bail;
1065                 }
1066
1067                 if (!new_inode && new_dir != old_dir &&
1068                     new_dir->i_nlink >= OCFS2_LINK_MAX) {
1069                         status = -EMLINK;
1070                         goto bail;
1071                 }
1072         }
1073
1074         status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1075                                             old_dentry->d_name.len,
1076                                             &old_de_ino);
1077         if (status) {
1078                 status = -ENOENT;
1079                 goto bail;
1080         }
1081
1082         /*
1083          *  Check for inode number is _not_ due to possible IO errors.
1084          *  We might rmdir the source, keep it as pwd of some process
1085          *  and merrily kill the link to whatever was created under the
1086          *  same name. Goodbye sticky bit ;-<
1087          */
1088         if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1089                 status = -ENOENT;
1090                 goto bail;
1091         }
1092
1093         /* check if the target already exists (in which case we need
1094          * to delete it */
1095         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1096                                           new_dentry->d_name.len,
1097                                           &newfe_blkno, new_dir, &new_de_bh,
1098                                           &new_de);
1099         /* The only error we allow here is -ENOENT because the new
1100          * file not existing is perfectly valid. */
1101         if ((status < 0) && (status != -ENOENT)) {
1102                 /* If we cannot find the file specified we should just */
1103                 /* return the error... */
1104                 mlog_errno(status);
1105                 goto bail;
1106         }
1107
1108         if (!new_de && new_inode) {
1109                 /*
1110                  * Target was unlinked by another node while we were
1111                  * waiting to get to ocfs2_rename(). There isn't
1112                  * anything we can do here to help the situation, so
1113                  * bubble up the appropriate error.
1114                  */
1115                 status = -ENOENT;
1116                 goto bail;
1117         }
1118
1119         /* In case we need to overwrite an existing file, we blow it
1120          * away first */
1121         if (new_de) {
1122                 /* VFS didn't think there existed an inode here, but
1123                  * someone else in the cluster must have raced our
1124                  * rename to create one. Today we error cleanly, in
1125                  * the future we should consider calling iget to build
1126                  * a new struct inode for this entry. */
1127                 if (!new_inode) {
1128                         status = -EACCES;
1129
1130                         mlog(0, "We found an inode for name %.*s but VFS "
1131                              "didn't give us one.\n", new_dentry->d_name.len,
1132                              new_dentry->d_name.name);
1133                         goto bail;
1134                 }
1135
1136                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1137                         status = -EACCES;
1138
1139                         mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1140                              (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1141                              (unsigned long long)newfe_blkno,
1142                              OCFS2_I(new_inode)->ip_flags);
1143                         goto bail;
1144                 }
1145
1146                 status = ocfs2_meta_lock(new_inode, &newfe_bh, 1);
1147                 if (status < 0) {
1148                         if (status != -ENOENT)
1149                                 mlog_errno(status);
1150                         goto bail;
1151                 }
1152                 new_child_locked = 1;
1153
1154                 status = ocfs2_remote_dentry_delete(new_dentry);
1155                 if (status < 0) {
1156                         mlog_errno(status);
1157                         goto bail;
1158                 }
1159
1160                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1161
1162                 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1163                      "newfebh=%p bhblocknr=%llu\n", new_de,
1164                      (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1165                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1166
1167                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1168                         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1169                                                           new_inode,
1170                                                           orphan_name,
1171                                                           &orphan_entry_bh);
1172                         if (status < 0) {
1173                                 mlog_errno(status);
1174                                 goto bail;
1175                         }
1176                 }
1177         } else {
1178                 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1179
1180                 status = ocfs2_check_dir_for_entry(new_dir,
1181                                                    new_dentry->d_name.name,
1182                                                    new_dentry->d_name.len);
1183                 if (status)
1184                         goto bail;
1185
1186                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1187                                                       new_dentry->d_name.name,
1188                                                       new_dentry->d_name.len,
1189                                                       &insert_entry_bh);
1190                 if (status < 0) {
1191                         mlog_errno(status);
1192                         goto bail;
1193                 }
1194         }
1195
1196         handle = ocfs2_start_trans(osb, OCFS2_RENAME_CREDITS);
1197         if (IS_ERR(handle)) {
1198                 status = PTR_ERR(handle);
1199                 handle = NULL;
1200                 mlog_errno(status);
1201                 goto bail;
1202         }
1203
1204         if (new_de) {
1205                 if (S_ISDIR(new_inode->i_mode)) {
1206                         if (!ocfs2_empty_dir(new_inode) ||
1207                             new_inode->i_nlink != 2) {
1208                                 status = -ENOTEMPTY;
1209                                 goto bail;
1210                         }
1211                 }
1212                 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1213                                               OCFS2_JOURNAL_ACCESS_WRITE);
1214                 if (status < 0) {
1215                         mlog_errno(status);
1216                         goto bail;
1217                 }
1218
1219                 if (S_ISDIR(new_inode->i_mode) ||
1220                     (newfe->i_links_count == cpu_to_le16(1))){
1221                         status = ocfs2_orphan_add(osb, handle, new_inode,
1222                                                   newfe, orphan_name,
1223                                                   orphan_entry_bh, orphan_dir);
1224                         if (status < 0) {
1225                                 mlog_errno(status);
1226                                 goto bail;
1227                         }
1228                 }
1229
1230                 /* change the dirent to point to the correct inode */
1231                 status = ocfs2_update_entry(new_dir, handle, new_de_bh,
1232                                             new_de, old_inode);
1233                 if (status < 0) {
1234                         mlog_errno(status);
1235                         goto bail;
1236                 }
1237                 new_dir->i_version++;
1238
1239                 if (S_ISDIR(new_inode->i_mode))
1240                         newfe->i_links_count = 0;
1241                 else
1242                         le16_add_cpu(&newfe->i_links_count, -1);
1243
1244                 status = ocfs2_journal_dirty(handle, newfe_bh);
1245                 if (status < 0) {
1246                         mlog_errno(status);
1247                         goto bail;
1248                 }
1249         } else {
1250                 /* if the name was not found in new_dir, add it now */
1251                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1252                                          OCFS2_I(old_inode)->ip_blkno,
1253                                          new_dir_bh, insert_entry_bh);
1254         }
1255
1256         old_inode->i_ctime = CURRENT_TIME;
1257         mark_inode_dirty(old_inode);
1258
1259         status = ocfs2_journal_access(handle, old_inode, old_inode_bh,
1260                                       OCFS2_JOURNAL_ACCESS_WRITE);
1261         if (status >= 0) {
1262                 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1263
1264                 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1265                 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1266
1267                 status = ocfs2_journal_dirty(handle, old_inode_bh);
1268                 if (status < 0)
1269                         mlog_errno(status);
1270         } else
1271                 mlog_errno(status);
1272
1273         /*
1274          * Now that the name has been added to new_dir, remove the old name.
1275          *
1276          * We don't keep any directory entry context around until now
1277          * because the insert might have changed the type of directory
1278          * we're dealing with.
1279          */
1280         old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1281                                      old_dentry->d_name.len,
1282                                      old_dir, &old_de);
1283         if (!old_de_bh) {
1284                 status = -EIO;
1285                 goto bail;
1286         }
1287
1288         status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1289         if (status < 0) {
1290                 mlog_errno(status);
1291                 goto bail;
1292         }
1293
1294         if (new_inode) {
1295                 new_inode->i_nlink--;
1296                 new_inode->i_ctime = CURRENT_TIME;
1297         }
1298         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1299         if (old_inode_de_bh) {
1300                 status = ocfs2_update_entry(old_inode, handle, old_inode_de_bh,
1301                                             old_inode_dot_dot_de, new_dir);
1302                 old_dir->i_nlink--;
1303                 if (new_inode) {
1304                         new_inode->i_nlink--;
1305                 } else {
1306                         inc_nlink(new_dir);
1307                         mark_inode_dirty(new_dir);
1308                 }
1309         }
1310         mark_inode_dirty(old_dir);
1311         ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1312         if (new_inode) {
1313                 mark_inode_dirty(new_inode);
1314                 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1315         }
1316
1317         if (old_dir != new_dir) {
1318                 /* Keep the same times on both directories.*/
1319                 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1320
1321                 /*
1322                  * This will also pick up the i_nlink change from the
1323                  * block above.
1324                  */
1325                 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1326         }
1327
1328         if (old_dir_nlink != old_dir->i_nlink) {
1329                 if (!old_dir_bh) {
1330                         mlog(ML_ERROR, "need to change nlink for old dir "
1331                              "%llu from %d to %d but bh is NULL!\n",
1332                              (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1333                              (int)old_dir_nlink, old_dir->i_nlink);
1334                 } else {
1335                         struct ocfs2_dinode *fe;
1336                         status = ocfs2_journal_access(handle, old_dir,
1337                                                       old_dir_bh,
1338                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1339                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1340                         fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1341                         status = ocfs2_journal_dirty(handle, old_dir_bh);
1342                 }
1343         }
1344
1345         ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1346         status = 0;
1347 bail:
1348         if (rename_lock)
1349                 ocfs2_rename_unlock(osb);
1350
1351         if (handle)
1352                 ocfs2_commit_trans(osb, handle);
1353
1354         if (parents_locked)
1355                 ocfs2_double_unlock(old_dir, new_dir);
1356
1357         if (old_child_locked)
1358                 ocfs2_meta_unlock(old_inode, 1);
1359
1360         if (new_child_locked)
1361                 ocfs2_meta_unlock(new_inode, 1);
1362
1363         if (orphan_dir) {
1364                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1365                 ocfs2_meta_unlock(orphan_dir, 1);
1366                 mutex_unlock(&orphan_dir->i_mutex);
1367                 iput(orphan_dir);
1368         }
1369
1370         if (new_inode)
1371                 sync_mapping_buffers(old_inode->i_mapping);
1372
1373         if (new_inode)
1374                 iput(new_inode);
1375         if (newfe_bh)
1376                 brelse(newfe_bh);
1377         if (old_inode_bh)
1378                 brelse(old_inode_bh);
1379         if (old_dir_bh)
1380                 brelse(old_dir_bh);
1381         if (new_dir_bh)
1382                 brelse(new_dir_bh);
1383         if (new_de_bh)
1384                 brelse(new_de_bh);
1385         if (old_de_bh)
1386                 brelse(old_de_bh);
1387         if (old_inode_de_bh)
1388                 brelse(old_inode_de_bh);
1389         if (orphan_entry_bh)
1390                 brelse(orphan_entry_bh);
1391         if (insert_entry_bh)
1392                 brelse(insert_entry_bh);
1393
1394         mlog_exit(status);
1395
1396         return status;
1397 }
1398
1399 /*
1400  * we expect i_size = strlen(symname). Copy symname into the file
1401  * data, including the null terminator.
1402  */
1403 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1404                                      handle_t *handle,
1405                                      struct inode *inode,
1406                                      const char *symname)
1407 {
1408         struct buffer_head **bhs = NULL;
1409         const char *c;
1410         struct super_block *sb = osb->sb;
1411         u64 p_blkno, p_blocks;
1412         int virtual, blocks, status, i, bytes_left;
1413
1414         bytes_left = i_size_read(inode) + 1;
1415         /* we can't trust i_blocks because we're actually going to
1416          * write i_size + 1 bytes. */
1417         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1418
1419         mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1420                         (unsigned long long)inode->i_blocks,
1421                         i_size_read(inode), blocks);
1422
1423         /* Sanity check -- make sure we're going to fit. */
1424         if (bytes_left >
1425             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1426                 status = -EIO;
1427                 mlog_errno(status);
1428                 goto bail;
1429         }
1430
1431         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1432         if (!bhs) {
1433                 status = -ENOMEM;
1434                 mlog_errno(status);
1435                 goto bail;
1436         }
1437
1438         status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1439                                              NULL);
1440         if (status < 0) {
1441                 mlog_errno(status);
1442                 goto bail;
1443         }
1444
1445         /* links can never be larger than one cluster so we know this
1446          * is all going to be contiguous, but do a sanity check
1447          * anyway. */
1448         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1449                 status = -EIO;
1450                 mlog_errno(status);
1451                 goto bail;
1452         }
1453
1454         virtual = 0;
1455         while(bytes_left > 0) {
1456                 c = &symname[virtual * sb->s_blocksize];
1457
1458                 bhs[virtual] = sb_getblk(sb, p_blkno);
1459                 if (!bhs[virtual]) {
1460                         status = -ENOMEM;
1461                         mlog_errno(status);
1462                         goto bail;
1463                 }
1464                 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1465
1466                 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1467                                               OCFS2_JOURNAL_ACCESS_CREATE);
1468                 if (status < 0) {
1469                         mlog_errno(status);
1470                         goto bail;
1471                 }
1472
1473                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1474
1475                 memcpy(bhs[virtual]->b_data, c,
1476                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1477                        bytes_left);
1478
1479                 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1480                 if (status < 0) {
1481                         mlog_errno(status);
1482                         goto bail;
1483                 }
1484
1485                 virtual++;
1486                 p_blkno++;
1487                 bytes_left -= sb->s_blocksize;
1488         }
1489
1490         status = 0;
1491 bail:
1492
1493         if (bhs) {
1494                 for(i = 0; i < blocks; i++)
1495                         if (bhs[i])
1496                                 brelse(bhs[i]);
1497                 kfree(bhs);
1498         }
1499
1500         mlog_exit(status);
1501         return status;
1502 }
1503
1504 static int ocfs2_symlink(struct inode *dir,
1505                          struct dentry *dentry,
1506                          const char *symname)
1507 {
1508         int status, l, credits;
1509         u64 newsize;
1510         struct ocfs2_super *osb = NULL;
1511         struct inode *inode = NULL;
1512         struct super_block *sb;
1513         struct buffer_head *new_fe_bh = NULL;
1514         struct buffer_head *de_bh = NULL;
1515         struct buffer_head *parent_fe_bh = NULL;
1516         struct ocfs2_dinode *fe = NULL;
1517         struct ocfs2_dinode *dirfe;
1518         handle_t *handle = NULL;
1519         struct ocfs2_alloc_context *inode_ac = NULL;
1520         struct ocfs2_alloc_context *data_ac = NULL;
1521
1522         mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1523                    dentry, symname, dentry->d_name.len, dentry->d_name.name);
1524
1525         sb = dir->i_sb;
1526         osb = OCFS2_SB(sb);
1527
1528         l = strlen(symname) + 1;
1529
1530         credits = ocfs2_calc_symlink_credits(sb);
1531
1532         /* lock the parent directory */
1533         status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
1534         if (status < 0) {
1535                 if (status != -ENOENT)
1536                         mlog_errno(status);
1537                 return status;
1538         }
1539
1540         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1541         if (!dirfe->i_links_count) {
1542                 /* can't make a file in a deleted directory. */
1543                 status = -ENOENT;
1544                 goto bail;
1545         }
1546
1547         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1548                                            dentry->d_name.len);
1549         if (status)
1550                 goto bail;
1551
1552         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1553                                               dentry->d_name.name,
1554                                               dentry->d_name.len, &de_bh);
1555         if (status < 0) {
1556                 mlog_errno(status);
1557                 goto bail;
1558         }
1559
1560         status = ocfs2_reserve_new_inode(osb, &inode_ac);
1561         if (status < 0) {
1562                 if (status != -ENOSPC)
1563                         mlog_errno(status);
1564                 goto bail;
1565         }
1566
1567         /* don't reserve bitmap space for fast symlinks. */
1568         if (l > ocfs2_fast_symlink_chars(sb)) {
1569                 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
1570                 if (status < 0) {
1571                         if (status != -ENOSPC)
1572                                 mlog_errno(status);
1573                         goto bail;
1574                 }
1575         }
1576
1577         handle = ocfs2_start_trans(osb, credits);
1578         if (IS_ERR(handle)) {
1579                 status = PTR_ERR(handle);
1580                 handle = NULL;
1581                 mlog_errno(status);
1582                 goto bail;
1583         }
1584
1585         status = ocfs2_mknod_locked(osb, dir, dentry,
1586                                     S_IFLNK | S_IRWXUGO, 0,
1587                                     &new_fe_bh, parent_fe_bh, handle,
1588                                     &inode, inode_ac);
1589         if (status < 0) {
1590                 mlog_errno(status);
1591                 goto bail;
1592         }
1593
1594         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1595         inode->i_rdev = 0;
1596         newsize = l - 1;
1597         if (l > ocfs2_fast_symlink_chars(sb)) {
1598                 u32 offset = 0;
1599
1600                 inode->i_op = &ocfs2_symlink_inode_operations;
1601                 status = ocfs2_do_extend_allocation(osb, inode, &offset, 1, 0,
1602                                                     new_fe_bh,
1603                                                     handle, data_ac, NULL,
1604                                                     NULL);
1605                 if (status < 0) {
1606                         if (status != -ENOSPC && status != -EINTR) {
1607                                 mlog(ML_ERROR,
1608                                      "Failed to extend file to %llu\n",
1609                                      (unsigned long long)newsize);
1610                                 mlog_errno(status);
1611                                 status = -ENOSPC;
1612                         }
1613                         goto bail;
1614                 }
1615                 i_size_write(inode, newsize);
1616                 inode->i_blocks = ocfs2_inode_sector_count(inode);
1617         } else {
1618                 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1619                 memcpy((char *) fe->id2.i_symlink, symname, l);
1620                 i_size_write(inode, newsize);
1621                 inode->i_blocks = 0;
1622         }
1623
1624         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1625         if (status < 0) {
1626                 mlog_errno(status);
1627                 goto bail;
1628         }
1629
1630         if (!ocfs2_inode_is_fast_symlink(inode)) {
1631                 status = ocfs2_create_symlink_data(osb, handle, inode,
1632                                                    symname);
1633                 if (status < 0) {
1634                         mlog_errno(status);
1635                         goto bail;
1636                 }
1637         }
1638
1639         status = ocfs2_add_entry(handle, dentry, inode,
1640                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
1641                                  de_bh);
1642         if (status < 0) {
1643                 mlog_errno(status);
1644                 goto bail;
1645         }
1646
1647         status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1648         if (status) {
1649                 mlog_errno(status);
1650                 goto bail;
1651         }
1652
1653         insert_inode_hash(inode);
1654         dentry->d_op = &ocfs2_dentry_ops;
1655         d_instantiate(dentry, inode);
1656 bail:
1657         if (handle)
1658                 ocfs2_commit_trans(osb, handle);
1659
1660         ocfs2_meta_unlock(dir, 1);
1661
1662         if (new_fe_bh)
1663                 brelse(new_fe_bh);
1664         if (parent_fe_bh)
1665                 brelse(parent_fe_bh);
1666         if (de_bh)
1667                 brelse(de_bh);
1668         if (inode_ac)
1669                 ocfs2_free_alloc_context(inode_ac);
1670         if (data_ac)
1671                 ocfs2_free_alloc_context(data_ac);
1672         if ((status < 0) && inode)
1673                 iput(inode);
1674
1675         mlog_exit(status);
1676
1677         return status;
1678 }
1679
1680 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1681 {
1682         int status, namelen;
1683
1684         mlog_entry_void();
1685
1686         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1687                            (long long)blkno);
1688         if (namelen <= 0) {
1689                 if (namelen)
1690                         status = namelen;
1691                 else
1692                         status = -EINVAL;
1693                 mlog_errno(status);
1694                 goto bail;
1695         }
1696         if (namelen != OCFS2_ORPHAN_NAMELEN) {
1697                 status = -EINVAL;
1698                 mlog_errno(status);
1699                 goto bail;
1700         }
1701
1702         mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
1703              namelen);
1704
1705         status = 0;
1706 bail:
1707         mlog_exit(status);
1708         return status;
1709 }
1710
1711 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1712                                     struct inode **ret_orphan_dir,
1713                                     struct inode *inode,
1714                                     char *name,
1715                                     struct buffer_head **de_bh)
1716 {
1717         struct inode *orphan_dir_inode;
1718         struct buffer_head *orphan_dir_bh = NULL;
1719         int status = 0;
1720
1721         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1722         if (status < 0) {
1723                 mlog_errno(status);
1724                 return status;
1725         }
1726
1727         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1728                                                        ORPHAN_DIR_SYSTEM_INODE,
1729                                                        osb->slot_num);
1730         if (!orphan_dir_inode) {
1731                 status = -ENOENT;
1732                 mlog_errno(status);
1733                 return status;
1734         }
1735
1736         mutex_lock(&orphan_dir_inode->i_mutex);
1737
1738         status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1739         if (status < 0) {
1740                 mlog_errno(status);
1741                 goto leave;
1742         }
1743
1744         status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1745                                               orphan_dir_bh, name,
1746                                               OCFS2_ORPHAN_NAMELEN, de_bh);
1747         if (status < 0) {
1748                 ocfs2_meta_unlock(orphan_dir_inode, 1);
1749
1750                 mlog_errno(status);
1751                 goto leave;
1752         }
1753
1754         *ret_orphan_dir = orphan_dir_inode;
1755
1756 leave:
1757         if (status) {
1758                 mutex_unlock(&orphan_dir_inode->i_mutex);
1759                 iput(orphan_dir_inode);
1760         }
1761
1762         if (orphan_dir_bh)
1763                 brelse(orphan_dir_bh);
1764
1765         mlog_exit(status);
1766         return status;
1767 }
1768
1769 static int ocfs2_orphan_add(struct ocfs2_super *osb,
1770                             handle_t *handle,
1771                             struct inode *inode,
1772                             struct ocfs2_dinode *fe,
1773                             char *name,
1774                             struct buffer_head *de_bh,
1775                             struct inode *orphan_dir_inode)
1776 {
1777         struct buffer_head *orphan_dir_bh = NULL;
1778         int status = 0;
1779         struct ocfs2_dinode *orphan_fe;
1780
1781         mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
1782
1783         status = ocfs2_read_block(osb,
1784                                   OCFS2_I(orphan_dir_inode)->ip_blkno,
1785                                   &orphan_dir_bh, OCFS2_BH_CACHED,
1786                                   orphan_dir_inode);
1787         if (status < 0) {
1788                 mlog_errno(status);
1789                 goto leave;
1790         }
1791
1792         status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
1793                                       OCFS2_JOURNAL_ACCESS_WRITE);
1794         if (status < 0) {
1795                 mlog_errno(status);
1796                 goto leave;
1797         }
1798
1799         /* we're a cluster, and nlink can change on disk from
1800          * underneath us... */
1801         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1802         if (S_ISDIR(inode->i_mode))
1803                 le16_add_cpu(&orphan_fe->i_links_count, 1);
1804         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1805
1806         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1807         if (status < 0) {
1808                 mlog_errno(status);
1809                 goto leave;
1810         }
1811
1812         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
1813                                    OCFS2_ORPHAN_NAMELEN, inode,
1814                                    OCFS2_I(inode)->ip_blkno,
1815                                    orphan_dir_bh, de_bh);
1816         if (status < 0) {
1817                 mlog_errno(status);
1818                 goto leave;
1819         }
1820
1821         le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
1822
1823         /* Record which orphan dir our inode now resides
1824          * in. delete_inode will use this to determine which orphan
1825          * dir to lock. */
1826         fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
1827
1828         mlog(0, "Inode %llu orphaned in slot %d\n",
1829              (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
1830
1831 leave:
1832         if (orphan_dir_bh)
1833                 brelse(orphan_dir_bh);
1834
1835         mlog_exit(status);
1836         return status;
1837 }
1838
1839 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
1840 int ocfs2_orphan_del(struct ocfs2_super *osb,
1841                      handle_t *handle,
1842                      struct inode *orphan_dir_inode,
1843                      struct inode *inode,
1844                      struct buffer_head *orphan_dir_bh)
1845 {
1846         char name[OCFS2_ORPHAN_NAMELEN + 1];
1847         struct ocfs2_dinode *orphan_fe;
1848         int status = 0;
1849         struct buffer_head *target_de_bh = NULL;
1850         struct ocfs2_dir_entry *target_de = NULL;
1851
1852         mlog_entry_void();
1853
1854         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1855         if (status < 0) {
1856                 mlog_errno(status);
1857                 goto leave;
1858         }
1859
1860         mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
1861              name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
1862              OCFS2_ORPHAN_NAMELEN);
1863
1864         /* find it's spot in the orphan directory */
1865         target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
1866                                         orphan_dir_inode, &target_de);
1867         if (!target_de_bh) {
1868                 status = -ENOENT;
1869                 mlog_errno(status);
1870                 goto leave;
1871         }
1872
1873         /* remove it from the orphan directory */
1874         status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
1875                                     target_de_bh);
1876         if (status < 0) {
1877                 mlog_errno(status);
1878                 goto leave;
1879         }
1880
1881         status = ocfs2_journal_access(handle,orphan_dir_inode,  orphan_dir_bh,
1882                                       OCFS2_JOURNAL_ACCESS_WRITE);
1883         if (status < 0) {
1884                 mlog_errno(status);
1885                 goto leave;
1886         }
1887
1888         /* do the i_nlink dance! :) */
1889         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1890         if (S_ISDIR(inode->i_mode))
1891                 le16_add_cpu(&orphan_fe->i_links_count, -1);
1892         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1893
1894         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1895         if (status < 0) {
1896                 mlog_errno(status);
1897                 goto leave;
1898         }
1899
1900 leave:
1901         if (target_de_bh)
1902                 brelse(target_de_bh);
1903
1904         mlog_exit(status);
1905         return status;
1906 }
1907
1908 const struct inode_operations ocfs2_dir_iops = {
1909         .create         = ocfs2_create,
1910         .lookup         = ocfs2_lookup,
1911         .link           = ocfs2_link,
1912         .unlink         = ocfs2_unlink,
1913         .rmdir          = ocfs2_unlink,
1914         .symlink        = ocfs2_symlink,
1915         .mkdir          = ocfs2_mkdir,
1916         .mknod          = ocfs2_mknod,
1917         .rename         = ocfs2_rename,
1918         .setattr        = ocfs2_setattr,
1919         .getattr        = ocfs2_getattr,
1920         .permission     = ocfs2_permission,
1921 };