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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"
David Chinnerda353b02007-08-28 14:00:13 +100025#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "xfs_dir2.h"
27#include "xfs_dmapi.h"
28#include "xfs_mount.h"
Nathan Scotta844f452005-11-02 14:38:42 +110029#include "xfs_da_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "xfs_bmap_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include "xfs_dir2_sf.h"
Nathan Scotta844f452005-11-02 14:38:42 +110032#include "xfs_attr_sf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "xfs_dinode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110035#include "xfs_inode_item.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "xfs_bmap.h"
37#include "xfs_error.h"
38#include "xfs_quota.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include "xfs_utils.h"
40#include "xfs_trans_space.h"
David Chinnera8272ce2007-11-23 16:28:09 +110041#include "xfs_vnodeops.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43
44/*
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100045 * Enter all inodes for a rename transaction into a sorted array.
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100047STATIC void
48xfs_sort_for_rename(
Barry Naujok556b8b12008-04-10 12:22:07 +100049 xfs_inode_t *dp1, /* in: old (source) directory inode */
50 xfs_inode_t *dp2, /* in: new (target) directory inode */
51 xfs_inode_t *ip1, /* in: inode of old entry */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100052 xfs_inode_t *ip2, /* in: inode of new entry, if it
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 already exists, NULL otherwise. */
Barry Naujok556b8b12008-04-10 12:22:07 +100054 xfs_inode_t **i_tab,/* out: array of inode returned, sorted */
55 int *num_inodes) /* out: number of inodes in array */
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Barry Naujok556b8b12008-04-10 12:22:07 +100057 xfs_inode_t *temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 int i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60 /*
61 * i_tab contains a list of pointers to inodes. We initialize
62 * the table here & we'll sort it. We will then use it to
63 * order the acquisition of the inode locks.
64 *
65 * Note that the table may contain duplicates. e.g., dp1 == dp2.
66 */
67 i_tab[0] = dp1;
68 i_tab[1] = dp2;
69 i_tab[2] = ip1;
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100070 if (ip2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 *num_inodes = 4;
72 i_tab[3] = ip2;
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100073 } else {
74 *num_inodes = 3;
75 i_tab[3] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 }
77
78 /*
79 * Sort the elements via bubble sort. (Remember, there are at
80 * most 4 elements to sort, so this is adequate.)
81 */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100082 for (i = 0; i < *num_inodes; i++) {
83 for (j = 1; j < *num_inodes; j++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
85 temp = i_tab[j];
86 i_tab[j] = i_tab[j-1];
87 i_tab[j-1] = temp;
88 }
89 }
90 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070091}
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093/*
94 * xfs_rename
95 */
96int
97xfs_rename(
Christoph Hellwig993386c2007-08-28 16:12:30 +100098 xfs_inode_t *src_dp,
Barry Naujok556b8b12008-04-10 12:22:07 +100099 struct xfs_name *src_name,
100 xfs_inode_t *src_ip,
Christoph Hellwig3937be52008-03-06 13:46:19 +1100101 xfs_inode_t *target_dp,
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000102 struct xfs_name *target_name,
103 xfs_inode_t *target_ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000105 xfs_trans_t *tp = NULL;
Christoph Hellwig993386c2007-08-28 16:12:30 +1000106 xfs_mount_t *mp = src_dp->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 int new_parent; /* moving to a new dir */
108 int src_is_directory; /* src_name is a directory */
109 int error;
110 xfs_bmap_free_t free_list;
111 xfs_fsblock_t first_block;
112 int cancel_flags;
113 int committed;
114 xfs_inode_t *inodes[4];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 int spaceres;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 int num_inodes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Lachlan McIlroycf441ee2008-02-07 16:42:19 +1100118 xfs_itrace_entry(src_dp);
Christoph Hellwig3937be52008-03-06 13:46:19 +1100119 xfs_itrace_entry(target_dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Christoph Hellwigeb9df392007-08-16 18:42:07 +1000121 if (DM_EVENT_ENABLED(src_dp, DM_EVENT_RENAME) ||
122 DM_EVENT_ENABLED(target_dp, DM_EVENT_RENAME)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 error = XFS_SEND_NAMESP(mp, DM_EVENT_RENAME,
Christoph Hellwigbc4ac742008-03-06 13:45:58 +1100124 src_dp, DM_RIGHT_NULL,
125 target_dp, DM_RIGHT_NULL,
Barry Naujok556b8b12008-04-10 12:22:07 +1000126 src_name->name, target_name->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 0, 0, 0);
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000128 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 }
131 /* Return through std_return after this point. */
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 new_parent = (src_dp != target_dp);
134 src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR);
135
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000136 if (src_is_directory) {
137 /*
138 * Check for link count overflow on target_dp
139 */
140 if (target_ip == NULL && new_parent &&
141 target_dp->i_d.di_nlink >= XFS_MAXLINK) {
142 error = XFS_ERROR(EMLINK);
143 goto std_return;
144 }
145 }
146
147 xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
148 inodes, &num_inodes);
149
Eric Sandeen9d87c312009-01-14 23:22:07 -0600150 xfs_bmap_init(&free_list, &first_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
152 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
Barry Naujok556b8b12008-04-10 12:22:07 +1000153 spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
155 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
156 if (error == ENOSPC) {
157 spaceres = 0;
158 error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
159 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
160 }
161 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 xfs_trans_cancel(tp, 0);
Christoph Hellwig1ac74e02008-04-22 17:34:12 +1000163 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
165
166 /*
167 * Attach the dquots to the inodes
168 */
Christoph Hellwig7d095252009-06-08 15:33:32 +0200169 error = xfs_qm_vop_rename_dqattach(inodes);
170 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 xfs_trans_cancel(tp, cancel_flags);
Christoph Hellwig1ac74e02008-04-22 17:34:12 +1000172 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 }
174
175 /*
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000176 * Lock all the participating inodes. Depending upon whether
177 * the target_name exists in the target directory, and
178 * whether the target directory is the same as the source
179 * directory, we can lock from 2 to 4 inodes.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000181 xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
182
183 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 * Join all the inodes to the transaction. From this point on,
185 * we can rely on either trans_commit or trans_cancel to unlock
186 * them. Note that we need to add a vnode reference to the
187 * directories since trans_commit & trans_cancel will decrement
188 * them when they unlock the inodes. Also, we need to be careful
189 * not to add an inode to the transaction more than once.
190 */
Christoph Hellwig3937be52008-03-06 13:46:19 +1100191 IHOLD(src_dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
Christoph Hellwig1ac74e02008-04-22 17:34:12 +1000193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 if (new_parent) {
Christoph Hellwig3937be52008-03-06 13:46:19 +1100195 IHOLD(target_dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
197 }
Christoph Hellwig1ac74e02008-04-22 17:34:12 +1000198
199 IHOLD(src_ip);
200 xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
201
202 if (target_ip) {
203 IHOLD(target_ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
205 }
206
207 /*
Christoph Hellwig2175dd92008-12-09 04:47:31 -0500208 * If we are using project inheritance, we only allow renames
209 * into our tree when the project IDs are the same; else the
210 * tree quota mechanism would be circumvented.
211 */
212 if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
213 (target_dp->i_d.di_projid != src_ip->i_d.di_projid))) {
214 error = XFS_ERROR(EXDEV);
215 goto error_return;
216 }
217
218 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 * Set up the target.
220 */
221 if (target_ip == NULL) {
222 /*
223 * If there's no space reservation, check the entry will
224 * fit before actually inserting it.
225 */
Barry Naujok556b8b12008-04-10 12:22:07 +1000226 error = xfs_dir_canenter(tp, target_dp, target_name, spaceres);
227 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 goto error_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 /*
230 * If target does not exist and the rename crosses
231 * directories, adjust the target directory link count
232 * to account for the ".." reference from the new entry.
233 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000234 error = xfs_dir_createname(tp, target_dp, target_name,
Barry Naujok556b8b12008-04-10 12:22:07 +1000235 src_ip->i_ino, &first_block,
236 &free_list, spaceres);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000237 if (error == ENOSPC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 goto error_return;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000239 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
242
243 if (new_parent && src_is_directory) {
244 error = xfs_bumplink(tp, target_dp);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000245 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 }
248 } else { /* target_ip != NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 /*
250 * If target exists and it's a directory, check that both
251 * target and source are directories and that target can be
252 * destroyed, or that neither is a directory.
253 */
254 if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
255 /*
256 * Make sure target dir is empty.
257 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000258 if (!(xfs_dir_isempty(target_ip)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 (target_ip->i_d.di_nlink > 2)) {
260 error = XFS_ERROR(EEXIST);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 goto error_return;
262 }
263 }
264
265 /*
266 * Link the source inode under the target name.
267 * If the source inode is a directory and we are moving
268 * it across directories, its ".." entry will be
269 * inconsistent until we replace that down below.
270 *
271 * In case there is already an entry with the same
272 * name at the destination directory, remove it first.
273 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000274 error = xfs_dir_replace(tp, target_dp, target_name,
Barry Naujok556b8b12008-04-10 12:22:07 +1000275 src_ip->i_ino,
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000276 &first_block, &free_list, spaceres);
277 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
280
281 /*
282 * Decrement the link count on the target since the target
283 * dir no longer points to it.
284 */
285 error = xfs_droplink(tp, target_ip);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000286 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289 if (src_is_directory) {
290 /*
291 * Drop the link from the old "." entry.
292 */
293 error = xfs_droplink(tp, target_ip);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000294 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 } /* target_ip != NULL */
298
299 /*
300 * Remove the source.
301 */
302 if (new_parent && src_is_directory) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 /*
304 * Rewrite the ".." entry to point to the new
305 * directory.
306 */
Barry Naujok556b8b12008-04-10 12:22:07 +1000307 error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
308 target_dp->i_ino,
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000309 &first_block, &free_list, spaceres);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 ASSERT(error != EEXIST);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000311 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 }
314
315 /*
Christoph Hellwig8f8670b2008-06-27 13:34:26 +1000316 * We always want to hit the ctime on the source inode.
317 *
318 * This isn't strictly required by the standards since the source
319 * inode isn't really being changed, but old unix file systems did
320 * it and some incremental backup programs won't work without it.
321 */
322 xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG);
323
324 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 * Adjust the link count on src_dp. This is necessary when
326 * renaming a directory, either within one parent when
327 * the target existed, or across two parent directories.
328 */
329 if (src_is_directory && (new_parent || target_ip != NULL)) {
330
331 /*
332 * Decrement link count on src_directory since the
333 * entry that's moved no longer points to it.
334 */
335 error = xfs_droplink(tp, src_dp);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000336 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 }
339
Barry Naujok556b8b12008-04-10 12:22:07 +1000340 error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
341 &first_block, &free_list, spaceres);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000342 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 goto abort_return;
Dave Chinner26c52952008-11-28 14:23:37 +1100344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
Dave Chinner26c52952008-11-28 14:23:37 +1100347 if (new_parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 * If this is a synchronous mount, make sure that the
352 * rename transaction goes to disk before returning to
353 * the user.
354 */
355 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
356 xfs_trans_set_sync(tp);
357 }
358
Eric Sandeenf7c99b62007-02-10 18:37:16 +1100359 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 if (error) {
361 xfs_bmap_cancel(&free_list);
362 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
363 XFS_TRANS_ABORT));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 goto std_return;
365 }
366
367 /*
368 * trans_commit will unlock src_ip, target_ip & decrement
369 * the vnode references.
370 */
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000371 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
373 /* Fall through to std_return with error = 0 or errno from
374 * xfs_trans_commit */
375std_return:
Christoph Hellwigeb9df392007-08-16 18:42:07 +1000376 if (DM_EVENT_ENABLED(src_dp, DM_EVENT_POSTRENAME) ||
377 DM_EVENT_ENABLED(target_dp, DM_EVENT_POSTRENAME)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 (void) XFS_SEND_NAMESP (mp, DM_EVENT_POSTRENAME,
Christoph Hellwigbc4ac742008-03-06 13:45:58 +1100379 src_dp, DM_RIGHT_NULL,
380 target_dp, DM_RIGHT_NULL,
Barry Naujok556b8b12008-04-10 12:22:07 +1000381 src_name->name, target_name->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 0, error, 0);
383 }
384 return error;
385
386 abort_return:
387 cancel_flags |= XFS_TRANS_ABORT;
388 /* FALLTHROUGH */
389 error_return:
390 xfs_bmap_cancel(&free_list);
391 xfs_trans_cancel(tp, cancel_flags);
392 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393}