2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * 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.
14 * 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
20 #include "xfs_types.h"
23 #include "xfs_trans.h"
27 #include "xfs_dmapi.h"
28 #include "xfs_mount.h"
29 #include "xfs_da_btree.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_dir2_sf.h"
32 #include "xfs_attr_sf.h"
33 #include "xfs_dinode.h"
34 #include "xfs_inode.h"
35 #include "xfs_inode_item.h"
37 #include "xfs_error.h"
38 #include "xfs_quota.h"
39 #include "xfs_utils.h"
40 #include "xfs_trans_space.h"
41 #include "xfs_vnodeops.h"
45 * Given an array of up to 4 inode pointers, unlock the pointed to inodes.
46 * If there are fewer than 4 entries in the array, the empty entries will
47 * be at the end and will have NULL pointers in them.
56 xfs_iunlock(i_tab[0], lock_mode);
57 for (i = 1; i < 4; i++) {
62 * Watch out for duplicate entries in the table.
64 if (i_tab[i] != i_tab[i-1])
65 xfs_iunlock(i_tab[i], lock_mode);
70 * Enter all inodes for a rename transaction into a sorted array.
74 xfs_inode_t *dp1, /* in: old (source) directory inode */
75 xfs_inode_t *dp2, /* in: new (target) directory inode */
76 xfs_inode_t *ip1, /* in: inode of old entry */
77 xfs_inode_t *ip2, /* in: inode of new entry, if it
78 already exists, NULL otherwise. */
79 xfs_inode_t **i_tab,/* out: array of inode returned, sorted */
80 int *num_inodes) /* out: number of inodes in array */
86 * i_tab contains a list of pointers to inodes. We initialize
87 * the table here & we'll sort it. We will then use it to
88 * order the acquisition of the inode locks.
90 * Note that the table may contain duplicates. e.g., dp1 == dp2.
104 * Sort the elements via bubble sort. (Remember, there are at
105 * most 4 elements to sort, so this is adequate.)
107 for (i = 0; i < *num_inodes; i++) {
108 for (j = 1; j < *num_inodes; j++) {
109 if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
111 i_tab[j] = i_tab[j-1];
124 struct xfs_name *src_name,
126 xfs_inode_t *target_dp,
127 struct xfs_name *target_name,
128 xfs_inode_t *target_ip)
130 xfs_trans_t *tp = NULL;
131 xfs_mount_t *mp = src_dp->i_mount;
132 int new_parent; /* moving to a new dir */
133 int src_is_directory; /* src_name is a directory */
135 xfs_bmap_free_t free_list;
136 xfs_fsblock_t first_block;
139 xfs_inode_t *inodes[4];
140 int target_ip_dropped = 0; /* dropped target_ip link? */
142 int target_link_zero = 0;
145 xfs_itrace_entry(src_dp);
146 xfs_itrace_entry(target_dp);
148 if (DM_EVENT_ENABLED(src_dp, DM_EVENT_RENAME) ||
149 DM_EVENT_ENABLED(target_dp, DM_EVENT_RENAME)) {
150 error = XFS_SEND_NAMESP(mp, DM_EVENT_RENAME,
151 src_dp, DM_RIGHT_NULL,
152 target_dp, DM_RIGHT_NULL,
153 src_name->name, target_name->name,
158 /* Return through std_return after this point. */
160 new_parent = (src_dp != target_dp);
161 src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR);
163 if (src_is_directory) {
165 * Check for link count overflow on target_dp
167 if (target_ip == NULL && new_parent &&
168 target_dp->i_d.di_nlink >= XFS_MAXLINK) {
169 error = XFS_ERROR(EMLINK);
174 xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
175 inodes, &num_inodes);
181 XFS_BMAP_INIT(&free_list, &first_block);
182 tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
183 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
184 spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
185 error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
186 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
187 if (error == ENOSPC) {
189 error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
190 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
193 xfs_trans_cancel(tp, 0);
198 * Attach the dquots to the inodes
200 if ((error = XFS_QM_DQVOPRENAME(mp, inodes))) {
201 xfs_trans_cancel(tp, cancel_flags);
206 * Lock all the participating inodes. Depending upon whether
207 * the target_name exists in the target directory, and
208 * whether the target directory is the same as the source
209 * directory, we can lock from 2 to 4 inodes.
211 xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
214 * If we are using project inheritance, we only allow renames
215 * into our tree when the project IDs are the same; else the
216 * tree quota mechanism would be circumvented.
218 if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
219 (target_dp->i_d.di_projid != src_ip->i_d.di_projid))) {
220 error = XFS_ERROR(EXDEV);
221 xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED);
222 xfs_trans_cancel(tp, cancel_flags);
227 * Join all the inodes to the transaction. From this point on,
228 * we can rely on either trans_commit or trans_cancel to unlock
229 * them. Note that we need to add a vnode reference to the
230 * directories since trans_commit & trans_cancel will decrement
231 * them when they unlock the inodes. Also, we need to be careful
232 * not to add an inode to the transaction more than once.
235 xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
238 xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
240 if ((src_ip != src_dp) && (src_ip != target_dp)) {
241 xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
243 if ((target_ip != NULL) &&
244 (target_ip != src_ip) &&
245 (target_ip != src_dp) &&
246 (target_ip != target_dp)) {
247 xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
253 if (target_ip == NULL) {
255 * If there's no space reservation, check the entry will
256 * fit before actually inserting it.
258 error = xfs_dir_canenter(tp, target_dp, target_name, spaceres);
262 * If target does not exist and the rename crosses
263 * directories, adjust the target directory link count
264 * to account for the ".." reference from the new entry.
266 error = xfs_dir_createname(tp, target_dp, target_name,
267 src_ip->i_ino, &first_block,
268 &free_list, spaceres);
273 xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
275 if (new_parent && src_is_directory) {
276 error = xfs_bumplink(tp, target_dp);
280 } else { /* target_ip != NULL */
282 * If target exists and it's a directory, check that both
283 * target and source are directories and that target can be
284 * destroyed, or that neither is a directory.
286 if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
288 * Make sure target dir is empty.
290 if (!(xfs_dir_isempty(target_ip)) ||
291 (target_ip->i_d.di_nlink > 2)) {
292 error = XFS_ERROR(EEXIST);
298 * Link the source inode under the target name.
299 * If the source inode is a directory and we are moving
300 * it across directories, its ".." entry will be
301 * inconsistent until we replace that down below.
303 * In case there is already an entry with the same
304 * name at the destination directory, remove it first.
306 error = xfs_dir_replace(tp, target_dp, target_name,
308 &first_block, &free_list, spaceres);
311 xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
314 * Decrement the link count on the target since the target
315 * dir no longer points to it.
317 error = xfs_droplink(tp, target_ip);
320 target_ip_dropped = 1;
322 if (src_is_directory) {
324 * Drop the link from the old "." entry.
326 error = xfs_droplink(tp, target_ip);
331 /* Do this test while we still hold the locks */
332 target_link_zero = (target_ip)->i_d.di_nlink==0;
334 } /* target_ip != NULL */
339 if (new_parent && src_is_directory) {
341 * Rewrite the ".." entry to point to the new
344 error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
346 &first_block, &free_list, spaceres);
347 ASSERT(error != EEXIST);
350 xfs_ichgtime(src_ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
354 * We always want to hit the ctime on the source inode.
355 * We do it in the if clause above for the 'new_parent &&
356 * src_is_directory' case, and here we get all the other
357 * cases. This isn't strictly required by the standards
358 * since the source inode isn't really being changed,
359 * but old unix file systems did it and some incremental
360 * backup programs won't work without it.
362 xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG);
366 * Adjust the link count on src_dp. This is necessary when
367 * renaming a directory, either within one parent when
368 * the target existed, or across two parent directories.
370 if (src_is_directory && (new_parent || target_ip != NULL)) {
373 * Decrement link count on src_directory since the
374 * entry that's moved no longer points to it.
376 error = xfs_droplink(tp, src_dp);
381 error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
382 &first_block, &free_list, spaceres);
385 xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
388 * Update the generation counts on all the directory inodes
389 * that we're modifying.
392 xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
396 xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
400 * If there was a target inode, take an extra reference on
401 * it here so that it doesn't go to xfs_inactive() from
404 if (target_ip != NULL) {
409 * If this is a synchronous mount, make sure that the
410 * rename transaction goes to disk before returning to
413 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
414 xfs_trans_set_sync(tp);
418 * Take refs. for vop_link_removed calls below. No need to worry
419 * about directory refs. because the caller holds them.
421 * Do holds before the xfs_bmap_finish since it might rele them down
425 if (target_ip_dropped)
429 error = xfs_bmap_finish(&tp, &free_list, &committed);
431 xfs_bmap_cancel(&free_list);
432 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
434 if (target_ip != NULL) {
437 if (target_ip_dropped) {
445 * trans_commit will unlock src_ip, target_ip & decrement
446 * the vnode references.
448 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
449 if (target_ip != NULL)
452 * Let interposed file systems know about removed links.
454 if (target_ip_dropped)
459 /* Fall through to std_return with error = 0 or errno from
460 * xfs_trans_commit */
462 if (DM_EVENT_ENABLED(src_dp, DM_EVENT_POSTRENAME) ||
463 DM_EVENT_ENABLED(target_dp, DM_EVENT_POSTRENAME)) {
464 (void) XFS_SEND_NAMESP (mp, DM_EVENT_POSTRENAME,
465 src_dp, DM_RIGHT_NULL,
466 target_dp, DM_RIGHT_NULL,
467 src_name->name, target_name->name,
473 cancel_flags |= XFS_TRANS_ABORT;
476 xfs_bmap_cancel(&free_list);
477 xfs_trans_cancel(tp, cancel_flags);
482 if (target_ip != NULL) {