fs/xfs/xfs_rename.c

   1 /*
   2  * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 #include "xfs.h"
  34 #include "xfs_macros.h"
  35 #include "xfs_types.h"
  36 #include "xfs_inum.h"
  37 #include "xfs_log.h"
  38 #include "xfs_trans.h"
  39 #include "xfs_sb.h"
  40 #include "xfs_dir.h"
  41 #include "xfs_dir2.h"
  42 #include "xfs_dmapi.h"
  43 #include "xfs_mount.h"
  44 #include "xfs_bmap_btree.h"
  45 #include "xfs_attr_sf.h"
  46 #include "xfs_dir_sf.h"
  47 #include "xfs_dir2_sf.h"
  48 #include "xfs_dinode.h"
  49 #include "xfs_inode_item.h"
  50 #include "xfs_inode.h"
  51 #include "xfs_bmap.h"
  52 #include "xfs_error.h"
  53 #include "xfs_quota.h"
  54 #include "xfs_refcache.h"
  55 #include "xfs_utils.h"
  56 #include "xfs_trans_space.h"
  57 #include "xfs_da_btree.h"
  58 #include "xfs_dir_leaf.h"
  59
  60
  61 /*
  62  * Given an array of up to 4 inode pointers, unlock the pointed to inodes.
  63  * If there are fewer than 4 entries in the array, the empty entries will
  64  * be at the end and will have NULL pointers in them.
  65  */
  66 STATIC void
  67 xfs_rename_unlock4(
  68         xfs_inode_t     **i_tab,
  69         uint            lock_mode)
  70 {
  71         int     i;
  72
  73         xfs_iunlock(i_tab[0], lock_mode);
  74         for (i = 1; i < 4; i++) {
  75                 if (i_tab[i] == NULL) {
  76                         break;
  77                 }
  78                 /*
  79                  * Watch out for duplicate entries in the table.
  80                  */
  81                 if (i_tab[i] != i_tab[i-1]) {
  82                         xfs_iunlock(i_tab[i], lock_mode);
  83                 }
  84         }
  85 }
  86
  87 #ifdef DEBUG
  88 int xfs_rename_skip, xfs_rename_nskip;
  89 #endif
  90
  91 /*
  92  * The following routine will acquire the locks required for a rename
  93  * operation. The code understands the semantics of renames and will
  94  * validate that name1 exists under dp1 & that name2 may or may not
  95  * exist under dp2.
  96  *
  97  * We are renaming dp1/name1 to dp2/name2.
  98  *
  99  * Return ENOENT if dp1 does not exist, other lookup errors, or 0 for success.
 100  */
 101 STATIC int
 102 xfs_lock_for_rename(
 103         xfs_inode_t     *dp1,   /* old (source) directory inode */
 104         xfs_inode_t     *dp2,   /* new (target) directory inode */
 105         vname_t         *vname1,/* old entry name */
 106         vname_t         *vname2,/* new entry name */
 107         xfs_inode_t     **ipp1, /* inode of old entry */
 108         xfs_inode_t     **ipp2, /* inode of new entry, if it
 109                                    already exists, NULL otherwise. */
 110         xfs_inode_t     **i_tab,/* array of inode returned, sorted */
 111         int             *num_inodes)  /* number of inodes in array */
 112 {
 113         xfs_inode_t             *ip1, *ip2, *temp;
 114         xfs_ino_t               inum1, inum2;
 115         int                     error;
 116         int                     i, j;
 117         uint                    lock_mode;
 118         int                     diff_dirs = (dp1 != dp2);
 119
 120         ip2 = NULL;
 121
 122         /*
 123          * First, find out the current inums of the entries so that we
 124          * can determine the initial locking order.  We'll have to
 125          * sanity check stuff after all the locks have been acquired
 126          * to see if we still have the right inodes, directories, etc.
 127          */
 128         lock_mode = xfs_ilock_map_shared(dp1);
 129         error = xfs_get_dir_entry(vname1, &ip1);
 130         if (error) {
 131                 xfs_iunlock_map_shared(dp1, lock_mode);
 132                 return error;
 133         }
 134
 135         inum1 = ip1->i_ino;
 136
 137         ASSERT(ip1);
 138         ITRACE(ip1);
 139
 140         /*
 141          * Unlock dp1 and lock dp2 if they are different.
 142          */
 143
 144         if (diff_dirs) {
 145                 xfs_iunlock_map_shared(dp1, lock_mode);
 146                 lock_mode = xfs_ilock_map_shared(dp2);
 147         }
 148
 149         error = xfs_dir_lookup_int(XFS_ITOBHV(dp2), lock_mode,
 150                                    vname2, &inum2, &ip2);
 151         if (error == ENOENT) {          /* target does not need to exist. */
 152                 inum2 = 0;
 153         } else if (error) {
 154                 /*
 155                  * If dp2 and dp1 are the same, the next line unlocks dp1.
 156                  * Got it?
 157                  */
 158                 xfs_iunlock_map_shared(dp2, lock_mode);
 159                 IRELE (ip1);
 160                 return error;
 161         } else {
 162                 ITRACE(ip2);
 163         }
 164
 165         /*
 166          * i_tab contains a list of pointers to inodes.  We initialize
 167          * the table here & we'll sort it.  We will then use it to
 168          * order the acquisition of the inode locks.
 169          *
 170          * Note that the table may contain duplicates.  e.g., dp1 == dp2.
 171          */
 172         i_tab[0] = dp1;
 173         i_tab[1] = dp2;
 174         i_tab[2] = ip1;
 175         if (inum2 == 0) {
 176                 *num_inodes = 3;
 177                 i_tab[3] = NULL;
 178         } else {
 179                 *num_inodes = 4;
 180                 i_tab[3] = ip2;
 181         }
 182
 183         /*
 184          * Sort the elements via bubble sort.  (Remember, there are at
 185          * most 4 elements to sort, so this is adequate.)
 186          */
 187         for (i=0; i < *num_inodes; i++) {
 188                 for (j=1; j < *num_inodes; j++) {
 189                         if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
 190                                 temp = i_tab[j];
 191                                 i_tab[j] = i_tab[j-1];
 192                                 i_tab[j-1] = temp;
 193                         }
 194                 }
 195         }
 196
 197         /*
 198          * We have dp2 locked. If it isn't first, unlock it.
 199          * If it is first, tell xfs_lock_inodes so it can skip it
 200          * when locking. if dp1 == dp2, xfs_lock_inodes will skip both
 201          * since they are equal. xfs_lock_inodes needs all these inodes
 202          * so that it can unlock and retry if there might be a dead-lock
 203          * potential with the log.
 204          */
 205
 206         if (i_tab[0] == dp2 && lock_mode == XFS_ILOCK_SHARED) {
 207 #ifdef DEBUG
 208                 xfs_rename_skip++;
 209 #endif
 210                 xfs_lock_inodes(i_tab, *num_inodes, 1, XFS_ILOCK_SHARED);
 211         } else {
 212 #ifdef DEBUG
 213                 xfs_rename_nskip++;
 214 #endif
 215                 xfs_iunlock_map_shared(dp2, lock_mode);
 216                 xfs_lock_inodes(i_tab, *num_inodes, 0, XFS_ILOCK_SHARED);
 217         }
 218
 219         /*
 220          * Set the return value. Null out any unused entries in i_tab.
 221          */
 222         *ipp1 = *ipp2 = NULL;
 223         for (i=0; i < *num_inodes; i++) {
 224                 if (i_tab[i]->i_ino == inum1) {
 225                         *ipp1 = i_tab[i];
 226                 }
 227                 if (i_tab[i]->i_ino == inum2) {
 228                         *ipp2 = i_tab[i];
 229                 }
 230         }
 231         for (;i < 4; i++) {
 232                 i_tab[i] = NULL;
 233         }
 234         return 0;
 235 }
 236
 237
 238 int rename_which_error_return = 0;
 239
 240 /*
 241  * xfs_rename
 242  */
 243 int
 244 xfs_rename(
 245         bhv_desc_t      *src_dir_bdp,
 246         vname_t         *src_vname,
 247         vnode_t         *target_dir_vp,
 248         vname_t         *target_vname,
 249         cred_t          *credp)
 250 {
 251         xfs_trans_t     *tp;
 252         xfs_inode_t     *src_dp, *target_dp, *src_ip, *target_ip;
 253         xfs_mount_t     *mp;
 254         int             new_parent;             /* moving to a new dir */
 255         int             src_is_directory;       /* src_name is a directory */
 256         int             error;
 257         xfs_bmap_free_t free_list;
 258         xfs_fsblock_t   first_block;
 259         int             cancel_flags;
 260         int             committed;
 261         xfs_inode_t     *inodes[4];
 262         int             target_ip_dropped = 0;  /* dropped target_ip link? */
 263         vnode_t         *src_dir_vp;
 264         bhv_desc_t      *target_dir_bdp;
 265         int             spaceres;
 266         int             target_link_zero = 0;
 267         int             num_inodes;
 268         char            *src_name = VNAME(src_vname);
 269         char            *target_name = VNAME(target_vname);
 270         int             src_namelen = VNAMELEN(src_vname);
 271         int             target_namelen = VNAMELEN(target_vname);
 272
 273         src_dir_vp = BHV_TO_VNODE(src_dir_bdp);
 274         vn_trace_entry(src_dir_vp, "xfs_rename", (inst_t *)__return_address);
 275         vn_trace_entry(target_dir_vp, "xfs_rename", (inst_t *)__return_address);
 276
 277         /*
 278          * Find the XFS behavior descriptor for the target directory
 279          * vnode since it was not handed to us.
 280          */
 281         target_dir_bdp = vn_bhv_lookup_unlocked(VN_BHV_HEAD(target_dir_vp),
 282                                                 &xfs_vnodeops);
 283         if (target_dir_bdp == NULL) {
 284                 return XFS_ERROR(EXDEV);
 285         }
 286
 287         src_dp = XFS_BHVTOI(src_dir_bdp);
 288         target_dp = XFS_BHVTOI(target_dir_bdp);
 289         mp = src_dp->i_mount;
 290
 291         if (DM_EVENT_ENABLED(src_dir_vp->v_vfsp, src_dp, DM_EVENT_RENAME) ||
 292             DM_EVENT_ENABLED(target_dir_vp->v_vfsp,
 293                                 target_dp, DM_EVENT_RENAME)) {
 294                 error = XFS_SEND_NAMESP(mp, DM_EVENT_RENAME,
 295                                         src_dir_vp, DM_RIGHT_NULL,
 296                                         target_dir_vp, DM_RIGHT_NULL,
 297                                         src_name, target_name,
 298                                         0, 0, 0);
 299                 if (error) {
 300                         return error;
 301                 }
 302         }
 303         /* Return through std_return after this point. */
 304
 305         /*
 306          * Lock all the participating inodes. Depending upon whether
 307          * the target_name exists in the target directory, and
 308          * whether the target directory is the same as the source
 309          * directory, we can lock from 2 to 4 inodes.
 310          * xfs_lock_for_rename() will return ENOENT if src_name
 311          * does not exist in the source directory.
 312          */
 313         tp = NULL;
 314         error = xfs_lock_for_rename(src_dp, target_dp, src_vname,
 315                         target_vname, &src_ip, &target_ip, inodes,
 316                         &num_inodes);
 317
 318         if (error) {
 319                 rename_which_error_return = __LINE__;
 320                 /*
 321                  * We have nothing locked, no inode references, and
 322                  * no transaction, so just get out.
 323                  */
 324                 goto std_return;
 325         }
 326
 327         ASSERT(src_ip != NULL);
 328
 329         if ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
 330                 /*
 331                  * Check for link count overflow on target_dp
 332                  */
 333                 if (target_ip == NULL && (src_dp != target_dp) &&
 334                     target_dp->i_d.di_nlink >= XFS_MAXLINK) {
 335                         rename_which_error_return = __LINE__;
 336                         error = XFS_ERROR(EMLINK);
 337                         xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED);
 338                         goto rele_return;
 339                 }
 340         }
 341
 342         new_parent = (src_dp != target_dp);
 343         src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR);
 344
 345         /*
 346          * Drop the locks on our inodes so that we can start the transaction.
 347          */
 348         xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED);
 349
 350         XFS_BMAP_INIT(&free_list, &first_block);
 351         tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
 352         cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
 353         spaceres = XFS_RENAME_SPACE_RES(mp, target_namelen);
 354         error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
 355                         XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
 356         if (error == ENOSPC) {
 357                 spaceres = 0;
 358                 error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
 359                                 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
 360         }
 361         if (error) {
 362                 rename_which_error_return = __LINE__;
 363                 xfs_trans_cancel(tp, 0);
 364                 goto rele_return;
 365         }
 366
 367         /*
 368          * Attach the dquots to the inodes
 369          */
 370         if ((error = XFS_QM_DQVOPRENAME(mp, inodes))) {
 371                 xfs_trans_cancel(tp, cancel_flags);
 372                 rename_which_error_return = __LINE__;
 373                 goto rele_return;
 374         }
 375
 376         /*
 377          * Reacquire the inode locks we dropped above.
 378          */
 379         xfs_lock_inodes(inodes, num_inodes, 0, XFS_ILOCK_EXCL);
 380
 381         /*
 382          * Join all the inodes to the transaction. From this point on,
 383          * we can rely on either trans_commit or trans_cancel to unlock
 384          * them.  Note that we need to add a vnode reference to the
 385          * directories since trans_commit & trans_cancel will decrement
 386          * them when they unlock the inodes.  Also, we need to be careful
 387          * not to add an inode to the transaction more than once.
 388          */
 389         VN_HOLD(src_dir_vp);
 390         xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
 391         if (new_parent) {
 392                 VN_HOLD(target_dir_vp);
 393                 xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
 394         }
 395         if ((src_ip != src_dp) && (src_ip != target_dp)) {
 396                 xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
 397         }
 398         if ((target_ip != NULL) &&
 399             (target_ip != src_ip) &&
 400             (target_ip != src_dp) &&
 401             (target_ip != target_dp)) {
 402                 xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
 403         }
 404
 405         /*
 406          * Set up the target.
 407          */
 408         if (target_ip == NULL) {
 409                 /*
 410                  * If there's no space reservation, check the entry will
 411                  * fit before actually inserting it.
 412                  */
 413                 if (spaceres == 0 &&
 414                     (error = XFS_DIR_CANENTER(mp, tp, target_dp, target_name,
 415                                 target_namelen))) {
 416                         rename_which_error_return = __LINE__;
 417                         goto error_return;
 418                 }
 419                 /*
 420                  * If target does not exist and the rename crosses
 421                  * directories, adjust the target directory link count
 422                  * to account for the ".." reference from the new entry.
 423                  */
 424                 error = XFS_DIR_CREATENAME(mp, tp, target_dp, target_name,
 425                                            target_namelen, src_ip->i_ino,
 426                                            &first_block, &free_list, spaceres);
 427                 if (error == ENOSPC) {
 428                         rename_which_error_return = __LINE__;
 429                         goto error_return;
 430                 }
 431                 if (error) {
 432                         rename_which_error_return = __LINE__;
 433                         goto abort_return;
 434                 }
 435                 xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
 436
 437                 if (new_parent && src_is_directory) {
 438                         error = xfs_bumplink(tp, target_dp);
 439                         if (error) {
 440                                 rename_which_error_return = __LINE__;
 441                                 goto abort_return;
 442                         }
 443                 }
 444         } else { /* target_ip != NULL */
 445
 446                 /*
 447                  * If target exists and it's a directory, check that both
 448                  * target and source are directories and that target can be
 449                  * destroyed, or that neither is a directory.
 450                  */
 451                 if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
 452                         /*
 453                          * Make sure target dir is empty.
 454                          */
 455                         if (!(XFS_DIR_ISEMPTY(target_ip->i_mount, target_ip)) ||
 456                             (target_ip->i_d.di_nlink > 2)) {
 457                                 error = XFS_ERROR(EEXIST);
 458                                 rename_which_error_return = __LINE__;
 459                                 goto error_return;
 460                         }
 461                 }
 462
 463                 /*
 464                  * Link the source inode under the target name.
 465                  * If the source inode is a directory and we are moving
 466                  * it across directories, its ".." entry will be
 467                  * inconsistent until we replace that down below.
 468                  *
 469                  * In case there is already an entry with the same
 470                  * name at the destination directory, remove it first.
 471                  */
 472                 error = XFS_DIR_REPLACE(mp, tp, target_dp, target_name,
 473                         target_namelen, src_ip->i_ino, &first_block,
 474                         &free_list, spaceres);
 475                 if (error) {
 476                         rename_which_error_return = __LINE__;
 477                         goto abort_return;
 478                 }
 479                 xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
 480
 481                 /*
 482                  * Decrement the link count on the target since the target
 483                  * dir no longer points to it.
 484                  */
 485                 error = xfs_droplink(tp, target_ip);
 486                 if (error) {
 487                         rename_which_error_return = __LINE__;
 488                         goto abort_return;
 489                 }
 490                 target_ip_dropped = 1;
 491
 492                 if (src_is_directory) {
 493                         /*
 494                          * Drop the link from the old "." entry.
 495                          */
 496                         error = xfs_droplink(tp, target_ip);
 497                         if (error) {
 498                                 rename_which_error_return = __LINE__;
 499                                 goto abort_return;
 500                         }
 501                 }
 502
 503                 /* Do this test while we still hold the locks */
 504                 target_link_zero = (target_ip)->i_d.di_nlink==0;
 505
 506         } /* target_ip != NULL */
 507
 508         /*
 509          * Remove the source.
 510          */
 511         if (new_parent && src_is_directory) {
 512
 513                 /*
 514                  * Rewrite the ".." entry to point to the new
 515                  * directory.
 516                  */
 517                 error = XFS_DIR_REPLACE(mp, tp, src_ip, "..", 2,
 518                                         target_dp->i_ino, &first_block,
 519                                         &free_list, spaceres);
 520                 ASSERT(error != EEXIST);
 521                 if (error) {
 522                         rename_which_error_return = __LINE__;
 523                         goto abort_return;
 524                 }
 525                 xfs_ichgtime(src_ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
 526
 527         } else {
 528                 /*
 529                  * We always want to hit the ctime on the source inode.
 530                  * We do it in the if clause above for the 'new_parent &&
 531                  * src_is_directory' case, and here we get all the other
 532                  * cases.  This isn't strictly required by the standards
 533                  * since the source inode isn't really being changed,
 534                  * but old unix file systems did it and some incremental
 535                  * backup programs won't work without it.
 536                  */
 537                 xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG);
 538         }
 539
 540         /*
 541          * Adjust the link count on src_dp.  This is necessary when
 542          * renaming a directory, either within one parent when
 543          * the target existed, or across two parent directories.
 544          */
 545         if (src_is_directory && (new_parent || target_ip != NULL)) {
 546
 547                 /*
 548                  * Decrement link count on src_directory since the
 549                  * entry that's moved no longer points to it.
 550                  */
 551                 error = xfs_droplink(tp, src_dp);
 552                 if (error) {
 553                         rename_which_error_return = __LINE__;
 554                         goto abort_return;
 555                 }
 556         }
 557
 558         error = XFS_DIR_REMOVENAME(mp, tp, src_dp, src_name, src_namelen,
 559                         src_ip->i_ino, &first_block, &free_list, spaceres);
 560         if (error) {
 561                 rename_which_error_return = __LINE__;
 562                 goto abort_return;
 563         }
 564         xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
 565
 566         /*
 567          * Update the generation counts on all the directory inodes
 568          * that we're modifying.
 569          */
 570         src_dp->i_gen++;
 571         xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
 572
 573         if (new_parent) {
 574                 target_dp->i_gen++;
 575                 xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
 576         }
 577
 578         /*
 579          * If there was a target inode, take an extra reference on
 580          * it here so that it doesn't go to xfs_inactive() from
 581          * within the commit.
 582          */
 583         if (target_ip != NULL) {
 584                 IHOLD(target_ip);
 585         }
 586
 587         /*
 588          * If this is a synchronous mount, make sure that the
 589          * rename transaction goes to disk before returning to
 590          * the user.
 591          */
 592         if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
 593                 xfs_trans_set_sync(tp);
 594         }
 595
 596         /*
 597          * Take refs. for vop_link_removed calls below.  No need to worry
 598          * about directory refs. because the caller holds them.
 599          *
 600          * Do holds before the xfs_bmap_finish since it might rele them down
 601          * to zero.
 602          */
 603
 604         if (target_ip_dropped)
 605                 IHOLD(target_ip);
 606         IHOLD(src_ip);
 607
 608         error = xfs_bmap_finish(&tp, &free_list, first_block, &committed);
 609         if (error) {
 610                 xfs_bmap_cancel(&free_list);
 611                 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
 612                                  XFS_TRANS_ABORT));
 613                 if (target_ip != NULL) {
 614                         IRELE(target_ip);
 615                 }
 616                 if (target_ip_dropped) {
 617                         IRELE(target_ip);
 618                 }
 619                 IRELE(src_ip);
 620                 goto std_return;
 621         }
 622
 623         /*
 624          * trans_commit will unlock src_ip, target_ip & decrement
 625          * the vnode references.
 626          */
 627         error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
 628         if (target_ip != NULL) {
 629                 xfs_refcache_purge_ip(target_ip);
 630                 IRELE(target_ip);
 631         }
 632         /*
 633          * Let interposed file systems know about removed links.
 634          */
 635         if (target_ip_dropped) {
 636                 VOP_LINK_REMOVED(XFS_ITOV(target_ip), target_dir_vp,
 637                                         target_link_zero);
 638                 IRELE(target_ip);
 639         }
 640
 641         FSC_NOTIFY_NAME_CHANGED(XFS_ITOV(src_ip));
 642
 643         IRELE(src_ip);
 644
 645         /* Fall through to std_return with error = 0 or errno from
 646          * xfs_trans_commit      */
 647 std_return:
 648         if (DM_EVENT_ENABLED(src_dir_vp->v_vfsp, src_dp, DM_EVENT_POSTRENAME) ||
 649             DM_EVENT_ENABLED(target_dir_vp->v_vfsp,
 650                                 target_dp, DM_EVENT_POSTRENAME)) {
 651                 (void) XFS_SEND_NAMESP (mp, DM_EVENT_POSTRENAME,
 652                                         src_dir_vp, DM_RIGHT_NULL,
 653                                         target_dir_vp, DM_RIGHT_NULL,
 654                                         src_name, target_name,
 655                                         0, error, 0);
 656         }
 657         return error;
 658
 659  abort_return:
 660         cancel_flags |= XFS_TRANS_ABORT;
 661         /* FALLTHROUGH */
 662  error_return:
 663         xfs_bmap_cancel(&free_list);
 664         xfs_trans_cancel(tp, cancel_flags);
 665         goto std_return;
 666
 667  rele_return:
 668         IRELE(src_ip);
 669         if (target_ip != NULL) {
 670                 IRELE(target_ip);
 671         }
 672         goto std_return;
 673 }