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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110019#include "xfs_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "xfs_types.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110022#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include "xfs_trans.h"
24#include "xfs_sb.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include "xfs_dir2.h"
26#include "xfs_dmapi.h"
27#include "xfs_mount.h"
Nathan Scotta844f452005-11-02 14:38:42 +110028#include "xfs_da_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include "xfs_bmap_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "xfs_dir2_sf.h"
Nathan Scotta844f452005-11-02 14:38:42 +110031#include "xfs_attr_sf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include "xfs_dinode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110034#include "xfs_inode_item.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include "xfs_bmap.h"
36#include "xfs_error.h"
37#include "xfs_quota.h"
38#include "xfs_refcache.h"
39#include "xfs_utils.h"
40#include "xfs_trans_space.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42
43/*
44 * Given an array of up to 4 inode pointers, unlock the pointed to inodes.
45 * If there are fewer than 4 entries in the array, the empty entries will
46 * be at the end and will have NULL pointers in them.
47 */
48STATIC void
49xfs_rename_unlock4(
50 xfs_inode_t **i_tab,
51 uint lock_mode)
52{
53 int i;
54
55 xfs_iunlock(i_tab[0], lock_mode);
56 for (i = 1; i < 4; i++) {
57 if (i_tab[i] == NULL) {
58 break;
59 }
60 /*
61 * Watch out for duplicate entries in the table.
62 */
63 if (i_tab[i] != i_tab[i-1]) {
64 xfs_iunlock(i_tab[i], lock_mode);
65 }
66 }
67}
68
69#ifdef DEBUG
70int xfs_rename_skip, xfs_rename_nskip;
71#endif
72
73/*
74 * The following routine will acquire the locks required for a rename
75 * operation. The code understands the semantics of renames and will
76 * validate that name1 exists under dp1 & that name2 may or may not
77 * exist under dp2.
78 *
79 * We are renaming dp1/name1 to dp2/name2.
80 *
81 * Return ENOENT if dp1 does not exist, other lookup errors, or 0 for success.
82 */
83STATIC int
84xfs_lock_for_rename(
85 xfs_inode_t *dp1, /* old (source) directory inode */
86 xfs_inode_t *dp2, /* new (target) directory inode */
Nathan Scott8285fb52006-06-09 17:07:12 +100087 bhv_vname_t *vname1,/* old entry name */
88 bhv_vname_t *vname2,/* new entry name */
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 xfs_inode_t **ipp1, /* inode of old entry */
90 xfs_inode_t **ipp2, /* inode of new entry, if it
91 already exists, NULL otherwise. */
92 xfs_inode_t **i_tab,/* array of inode returned, sorted */
93 int *num_inodes) /* number of inodes in array */
94{
95 xfs_inode_t *ip1, *ip2, *temp;
96 xfs_ino_t inum1, inum2;
97 int error;
98 int i, j;
99 uint lock_mode;
100 int diff_dirs = (dp1 != dp2);
101
102 ip2 = NULL;
103
104 /*
105 * First, find out the current inums of the entries so that we
106 * can determine the initial locking order. We'll have to
107 * sanity check stuff after all the locks have been acquired
108 * to see if we still have the right inodes, directories, etc.
109 */
110 lock_mode = xfs_ilock_map_shared(dp1);
111 error = xfs_get_dir_entry(vname1, &ip1);
112 if (error) {
113 xfs_iunlock_map_shared(dp1, lock_mode);
114 return error;
115 }
116
117 inum1 = ip1->i_ino;
118
119 ASSERT(ip1);
120 ITRACE(ip1);
121
122 /*
123 * Unlock dp1 and lock dp2 if they are different.
124 */
125
126 if (diff_dirs) {
127 xfs_iunlock_map_shared(dp1, lock_mode);
128 lock_mode = xfs_ilock_map_shared(dp2);
129 }
130
131 error = xfs_dir_lookup_int(XFS_ITOBHV(dp2), lock_mode,
132 vname2, &inum2, &ip2);
133 if (error == ENOENT) { /* target does not need to exist. */
134 inum2 = 0;
135 } else if (error) {
136 /*
137 * If dp2 and dp1 are the same, the next line unlocks dp1.
138 * Got it?
139 */
140 xfs_iunlock_map_shared(dp2, lock_mode);
141 IRELE (ip1);
142 return error;
143 } else {
144 ITRACE(ip2);
145 }
146
147 /*
148 * i_tab contains a list of pointers to inodes. We initialize
149 * the table here & we'll sort it. We will then use it to
150 * order the acquisition of the inode locks.
151 *
152 * Note that the table may contain duplicates. e.g., dp1 == dp2.
153 */
154 i_tab[0] = dp1;
155 i_tab[1] = dp2;
156 i_tab[2] = ip1;
157 if (inum2 == 0) {
158 *num_inodes = 3;
159 i_tab[3] = NULL;
160 } else {
161 *num_inodes = 4;
162 i_tab[3] = ip2;
163 }
164
165 /*
166 * Sort the elements via bubble sort. (Remember, there are at
167 * most 4 elements to sort, so this is adequate.)
168 */
169 for (i=0; i < *num_inodes; i++) {
170 for (j=1; j < *num_inodes; j++) {
171 if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
172 temp = i_tab[j];
173 i_tab[j] = i_tab[j-1];
174 i_tab[j-1] = temp;
175 }
176 }
177 }
178
179 /*
180 * We have dp2 locked. If it isn't first, unlock it.
181 * If it is first, tell xfs_lock_inodes so it can skip it
182 * when locking. if dp1 == dp2, xfs_lock_inodes will skip both
183 * since they are equal. xfs_lock_inodes needs all these inodes
184 * so that it can unlock and retry if there might be a dead-lock
185 * potential with the log.
186 */
187
188 if (i_tab[0] == dp2 && lock_mode == XFS_ILOCK_SHARED) {
189#ifdef DEBUG
190 xfs_rename_skip++;
191#endif
192 xfs_lock_inodes(i_tab, *num_inodes, 1, XFS_ILOCK_SHARED);
193 } else {
194#ifdef DEBUG
195 xfs_rename_nskip++;
196#endif
197 xfs_iunlock_map_shared(dp2, lock_mode);
198 xfs_lock_inodes(i_tab, *num_inodes, 0, XFS_ILOCK_SHARED);
199 }
200
201 /*
202 * Set the return value. Null out any unused entries in i_tab.
203 */
204 *ipp1 = *ipp2 = NULL;
205 for (i=0; i < *num_inodes; i++) {
206 if (i_tab[i]->i_ino == inum1) {
207 *ipp1 = i_tab[i];
208 }
209 if (i_tab[i]->i_ino == inum2) {
210 *ipp2 = i_tab[i];
211 }
212 }
213 for (;i < 4; i++) {
214 i_tab[i] = NULL;
215 }
216 return 0;
217}
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219/*
220 * xfs_rename
221 */
222int
223xfs_rename(
224 bhv_desc_t *src_dir_bdp,
Nathan Scott8285fb52006-06-09 17:07:12 +1000225 bhv_vname_t *src_vname,
Nathan Scott67fcaa72006-06-09 17:00:52 +1000226 bhv_vnode_t *target_dir_vp,
Nathan Scott8285fb52006-06-09 17:07:12 +1000227 bhv_vname_t *target_vname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 cred_t *credp)
229{
230 xfs_trans_t *tp;
231 xfs_inode_t *src_dp, *target_dp, *src_ip, *target_ip;
232 xfs_mount_t *mp;
233 int new_parent; /* moving to a new dir */
234 int src_is_directory; /* src_name is a directory */
235 int error;
236 xfs_bmap_free_t free_list;
237 xfs_fsblock_t first_block;
238 int cancel_flags;
239 int committed;
240 xfs_inode_t *inodes[4];
241 int target_ip_dropped = 0; /* dropped target_ip link? */
Nathan Scott67fcaa72006-06-09 17:00:52 +1000242 bhv_vnode_t *src_dir_vp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 int spaceres;
244 int target_link_zero = 0;
245 int num_inodes;
246 char *src_name = VNAME(src_vname);
247 char *target_name = VNAME(target_vname);
248 int src_namelen = VNAMELEN(src_vname);
249 int target_namelen = VNAMELEN(target_vname);
250
251 src_dir_vp = BHV_TO_VNODE(src_dir_bdp);
252 vn_trace_entry(src_dir_vp, "xfs_rename", (inst_t *)__return_address);
253 vn_trace_entry(target_dir_vp, "xfs_rename", (inst_t *)__return_address);
254
255 /*
256 * Find the XFS behavior descriptor for the target directory
257 * vnode since it was not handed to us.
258 */
Christoph Hellwig75e17b32006-01-11 20:58:44 +1100259 target_dp = xfs_vtoi(target_dir_vp);
260 if (target_dp == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 return XFS_ERROR(EXDEV);
262 }
263
264 src_dp = XFS_BHVTOI(src_dir_bdp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 mp = src_dp->i_mount;
266
267 if (DM_EVENT_ENABLED(src_dir_vp->v_vfsp, src_dp, DM_EVENT_RENAME) ||
268 DM_EVENT_ENABLED(target_dir_vp->v_vfsp,
269 target_dp, DM_EVENT_RENAME)) {
270 error = XFS_SEND_NAMESP(mp, DM_EVENT_RENAME,
271 src_dir_vp, DM_RIGHT_NULL,
272 target_dir_vp, DM_RIGHT_NULL,
273 src_name, target_name,
274 0, 0, 0);
275 if (error) {
276 return error;
277 }
278 }
279 /* Return through std_return after this point. */
280
281 /*
282 * Lock all the participating inodes. Depending upon whether
283 * the target_name exists in the target directory, and
284 * whether the target directory is the same as the source
285 * directory, we can lock from 2 to 4 inodes.
286 * xfs_lock_for_rename() will return ENOENT if src_name
287 * does not exist in the source directory.
288 */
289 tp = NULL;
290 error = xfs_lock_for_rename(src_dp, target_dp, src_vname,
291 target_vname, &src_ip, &target_ip, inodes,
292 &num_inodes);
293
294 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 /*
296 * We have nothing locked, no inode references, and
297 * no transaction, so just get out.
298 */
299 goto std_return;
300 }
301
302 ASSERT(src_ip != NULL);
303
304 if ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
305 /*
306 * Check for link count overflow on target_dp
307 */
308 if (target_ip == NULL && (src_dp != target_dp) &&
309 target_dp->i_d.di_nlink >= XFS_MAXLINK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 error = XFS_ERROR(EMLINK);
311 xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED);
312 goto rele_return;
313 }
314 }
315
Nathan Scottb1ecdda2006-05-08 19:51:42 +1000316 /*
317 * If we are using project inheritance, we only allow renames
318 * into our tree when the project IDs are the same; else the
319 * tree quota mechanism would be circumvented.
320 */
321 if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
322 (target_dp->i_d.di_projid != src_ip->i_d.di_projid))) {
323 error = XFS_ERROR(EXDEV);
324 xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED);
325 goto rele_return;
326 }
327
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 new_parent = (src_dp != target_dp);
329 src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR);
330
331 /*
332 * Drop the locks on our inodes so that we can start the transaction.
333 */
334 xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED);
335
336 XFS_BMAP_INIT(&free_list, &first_block);
337 tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
338 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
339 spaceres = XFS_RENAME_SPACE_RES(mp, target_namelen);
340 error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
341 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
342 if (error == ENOSPC) {
343 spaceres = 0;
344 error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
345 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
346 }
347 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 xfs_trans_cancel(tp, 0);
349 goto rele_return;
350 }
351
352 /*
353 * Attach the dquots to the inodes
354 */
355 if ((error = XFS_QM_DQVOPRENAME(mp, inodes))) {
356 xfs_trans_cancel(tp, cancel_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 goto rele_return;
358 }
359
360 /*
361 * Reacquire the inode locks we dropped above.
362 */
363 xfs_lock_inodes(inodes, num_inodes, 0, XFS_ILOCK_EXCL);
364
365 /*
366 * Join all the inodes to the transaction. From this point on,
367 * we can rely on either trans_commit or trans_cancel to unlock
368 * them. Note that we need to add a vnode reference to the
369 * directories since trans_commit & trans_cancel will decrement
370 * them when they unlock the inodes. Also, we need to be careful
371 * not to add an inode to the transaction more than once.
372 */
373 VN_HOLD(src_dir_vp);
374 xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
375 if (new_parent) {
376 VN_HOLD(target_dir_vp);
377 xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
378 }
379 if ((src_ip != src_dp) && (src_ip != target_dp)) {
380 xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
381 }
382 if ((target_ip != NULL) &&
383 (target_ip != src_ip) &&
384 (target_ip != src_dp) &&
385 (target_ip != target_dp)) {
386 xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
387 }
388
389 /*
390 * Set up the target.
391 */
392 if (target_ip == NULL) {
393 /*
394 * If there's no space reservation, check the entry will
395 * fit before actually inserting it.
396 */
397 if (spaceres == 0 &&
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000398 (error = xfs_dir_canenter(tp, target_dp, target_name,
399 target_namelen)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 goto error_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 /*
402 * If target does not exist and the rename crosses
403 * directories, adjust the target directory link count
404 * to account for the ".." reference from the new entry.
405 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000406 error = xfs_dir_createname(tp, target_dp, target_name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 target_namelen, src_ip->i_ino,
408 &first_block, &free_list, spaceres);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000409 if (error == ENOSPC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 goto error_return;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000411 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
414
415 if (new_parent && src_is_directory) {
416 error = xfs_bumplink(tp, target_dp);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000417 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 }
420 } else { /* target_ip != NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 /*
422 * If target exists and it's a directory, check that both
423 * target and source are directories and that target can be
424 * destroyed, or that neither is a directory.
425 */
426 if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
427 /*
428 * Make sure target dir is empty.
429 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000430 if (!(xfs_dir_isempty(target_ip)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 (target_ip->i_d.di_nlink > 2)) {
432 error = XFS_ERROR(EEXIST);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 goto error_return;
434 }
435 }
436
437 /*
438 * Link the source inode under the target name.
439 * If the source inode is a directory and we are moving
440 * it across directories, its ".." entry will be
441 * inconsistent until we replace that down below.
442 *
443 * In case there is already an entry with the same
444 * name at the destination directory, remove it first.
445 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000446 error = xfs_dir_replace(tp, target_dp, target_name,
447 target_namelen, src_ip->i_ino,
448 &first_block, &free_list, spaceres);
449 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
452
453 /*
454 * Decrement the link count on the target since the target
455 * dir no longer points to it.
456 */
457 error = xfs_droplink(tp, target_ip);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000458 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 target_ip_dropped = 1;
461
462 if (src_is_directory) {
463 /*
464 * Drop the link from the old "." entry.
465 */
466 error = xfs_droplink(tp, target_ip);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000467 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 }
470
471 /* Do this test while we still hold the locks */
472 target_link_zero = (target_ip)->i_d.di_nlink==0;
473
474 } /* target_ip != NULL */
475
476 /*
477 * Remove the source.
478 */
479 if (new_parent && src_is_directory) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 /*
481 * Rewrite the ".." entry to point to the new
482 * directory.
483 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000484 error = xfs_dir_replace(tp, src_ip, "..", 2, target_dp->i_ino,
485 &first_block, &free_list, spaceres);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 ASSERT(error != EEXIST);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000487 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 xfs_ichgtime(src_ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
490
491 } else {
492 /*
493 * We always want to hit the ctime on the source inode.
494 * We do it in the if clause above for the 'new_parent &&
495 * src_is_directory' case, and here we get all the other
496 * cases. This isn't strictly required by the standards
497 * since the source inode isn't really being changed,
498 * but old unix file systems did it and some incremental
499 * backup programs won't work without it.
500 */
501 xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG);
502 }
503
504 /*
505 * Adjust the link count on src_dp. This is necessary when
506 * renaming a directory, either within one parent when
507 * the target existed, or across two parent directories.
508 */
509 if (src_is_directory && (new_parent || target_ip != NULL)) {
510
511 /*
512 * Decrement link count on src_directory since the
513 * entry that's moved no longer points to it.
514 */
515 error = xfs_droplink(tp, src_dp);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000516 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 }
519
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000520 error = xfs_dir_removename(tp, src_dp, src_name, src_namelen,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 src_ip->i_ino, &first_block, &free_list, spaceres);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000522 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
525
526 /*
527 * Update the generation counts on all the directory inodes
528 * that we're modifying.
529 */
530 src_dp->i_gen++;
531 xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
532
533 if (new_parent) {
534 target_dp->i_gen++;
535 xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
536 }
537
538 /*
539 * If there was a target inode, take an extra reference on
540 * it here so that it doesn't go to xfs_inactive() from
541 * within the commit.
542 */
543 if (target_ip != NULL) {
544 IHOLD(target_ip);
545 }
546
547 /*
548 * If this is a synchronous mount, make sure that the
549 * rename transaction goes to disk before returning to
550 * the user.
551 */
552 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
553 xfs_trans_set_sync(tp);
554 }
555
556 /*
557 * Take refs. for vop_link_removed calls below. No need to worry
558 * about directory refs. because the caller holds them.
559 *
560 * Do holds before the xfs_bmap_finish since it might rele them down
561 * to zero.
562 */
563
564 if (target_ip_dropped)
565 IHOLD(target_ip);
566 IHOLD(src_ip);
567
568 error = xfs_bmap_finish(&tp, &free_list, first_block, &committed);
569 if (error) {
570 xfs_bmap_cancel(&free_list);
571 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
572 XFS_TRANS_ABORT));
573 if (target_ip != NULL) {
574 IRELE(target_ip);
575 }
576 if (target_ip_dropped) {
577 IRELE(target_ip);
578 }
579 IRELE(src_ip);
580 goto std_return;
581 }
582
583 /*
584 * trans_commit will unlock src_ip, target_ip & decrement
585 * the vnode references.
586 */
587 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
588 if (target_ip != NULL) {
589 xfs_refcache_purge_ip(target_ip);
590 IRELE(target_ip);
591 }
592 /*
593 * Let interposed file systems know about removed links.
594 */
595 if (target_ip_dropped) {
Nathan Scott67fcaa72006-06-09 17:00:52 +1000596 bhv_vop_link_removed(XFS_ITOV(target_ip), target_dir_vp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 target_link_zero);
598 IRELE(target_ip);
599 }
600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 IRELE(src_ip);
602
603 /* Fall through to std_return with error = 0 or errno from
604 * xfs_trans_commit */
605std_return:
606 if (DM_EVENT_ENABLED(src_dir_vp->v_vfsp, src_dp, DM_EVENT_POSTRENAME) ||
607 DM_EVENT_ENABLED(target_dir_vp->v_vfsp,
608 target_dp, DM_EVENT_POSTRENAME)) {
609 (void) XFS_SEND_NAMESP (mp, DM_EVENT_POSTRENAME,
610 src_dir_vp, DM_RIGHT_NULL,
611 target_dir_vp, DM_RIGHT_NULL,
612 src_name, target_name,
613 0, error, 0);
614 }
615 return error;
616
617 abort_return:
618 cancel_flags |= XFS_TRANS_ABORT;
619 /* FALLTHROUGH */
620 error_return:
621 xfs_bmap_cancel(&free_list);
622 xfs_trans_cancel(tp, cancel_flags);
623 goto std_return;
624
625 rele_return:
626 IRELE(src_ip);
627 if (target_ip != NULL) {
628 IRELE(target_ip);
629 }
630 goto std_return;
631}