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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"
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000042#include "xfs_trace.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44
45/*
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100046 * Enter all inodes for a rename transaction into a sorted array.
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100048STATIC void
49xfs_sort_for_rename(
Barry Naujok556b8b12008-04-10 12:22:07 +100050 xfs_inode_t *dp1, /* in: old (source) directory inode */
51 xfs_inode_t *dp2, /* in: new (target) directory inode */
52 xfs_inode_t *ip1, /* in: inode of old entry */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100053 xfs_inode_t *ip2, /* in: inode of new entry, if it
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 already exists, NULL otherwise. */
Barry Naujok556b8b12008-04-10 12:22:07 +100055 xfs_inode_t **i_tab,/* out: array of inode returned, sorted */
56 int *num_inodes) /* out: number of inodes in array */
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
Barry Naujok556b8b12008-04-10 12:22:07 +100058 xfs_inode_t *temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 int i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61 /*
62 * i_tab contains a list of pointers to inodes. We initialize
63 * the table here & we'll sort it. We will then use it to
64 * order the acquisition of the inode locks.
65 *
66 * Note that the table may contain duplicates. e.g., dp1 == dp2.
67 */
68 i_tab[0] = dp1;
69 i_tab[1] = dp2;
70 i_tab[2] = ip1;
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100071 if (ip2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 *num_inodes = 4;
73 i_tab[3] = ip2;
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100074 } else {
75 *num_inodes = 3;
76 i_tab[3] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 }
78
79 /*
80 * Sort the elements via bubble sort. (Remember, there are at
81 * most 4 elements to sort, so this is adequate.)
82 */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100083 for (i = 0; i < *num_inodes; i++) {
84 for (j = 1; j < *num_inodes; j++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
86 temp = i_tab[j];
87 i_tab[j] = i_tab[j-1];
88 i_tab[j-1] = temp;
89 }
90 }
91 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094/*
95 * xfs_rename
96 */
97int
98xfs_rename(
Christoph Hellwig993386c2007-08-28 16:12:30 +100099 xfs_inode_t *src_dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000100 struct xfs_name *src_name,
101 xfs_inode_t *src_ip,
Christoph Hellwig3937be52008-03-06 13:46:19 +1100102 xfs_inode_t *target_dp,
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000103 struct xfs_name *target_name,
104 xfs_inode_t *target_ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000106 xfs_trans_t *tp = NULL;
Christoph Hellwig993386c2007-08-28 16:12:30 +1000107 xfs_mount_t *mp = src_dp->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 int new_parent; /* moving to a new dir */
109 int src_is_directory; /* src_name is a directory */
110 int error;
111 xfs_bmap_free_t free_list;
112 xfs_fsblock_t first_block;
113 int cancel_flags;
114 int committed;
115 xfs_inode_t *inodes[4];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 int spaceres;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 int num_inodes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Lachlan McIlroycf441ee2008-02-07 16:42:19 +1100119 xfs_itrace_entry(src_dp);
Christoph Hellwig3937be52008-03-06 13:46:19 +1100120 xfs_itrace_entry(target_dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Christoph Hellwigeb9df392007-08-16 18:42:07 +1000122 if (DM_EVENT_ENABLED(src_dp, DM_EVENT_RENAME) ||
123 DM_EVENT_ENABLED(target_dp, DM_EVENT_RENAME)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 error = XFS_SEND_NAMESP(mp, DM_EVENT_RENAME,
Christoph Hellwigbc4ac742008-03-06 13:45:58 +1100125 src_dp, DM_RIGHT_NULL,
126 target_dp, DM_RIGHT_NULL,
Barry Naujok556b8b12008-04-10 12:22:07 +1000127 src_name->name, target_name->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 0, 0, 0);
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000129 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 }
132 /* Return through std_return after this point. */
133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 new_parent = (src_dp != target_dp);
135 src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR);
136
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000137 if (src_is_directory) {
138 /*
139 * Check for link count overflow on target_dp
140 */
141 if (target_ip == NULL && new_parent &&
142 target_dp->i_d.di_nlink >= XFS_MAXLINK) {
143 error = XFS_ERROR(EMLINK);
144 goto std_return;
145 }
146 }
147
148 xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
149 inodes, &num_inodes);
150
Eric Sandeen9d87c312009-01-14 23:22:07 -0600151 xfs_bmap_init(&free_list, &first_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
153 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
Barry Naujok556b8b12008-04-10 12:22:07 +1000154 spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
156 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
157 if (error == ENOSPC) {
158 spaceres = 0;
159 error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
160 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
161 }
162 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 xfs_trans_cancel(tp, 0);
Christoph Hellwig1ac74e02008-04-22 17:34:12 +1000164 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 }
166
167 /*
168 * Attach the dquots to the inodes
169 */
Christoph Hellwig7d095252009-06-08 15:33:32 +0200170 error = xfs_qm_vop_rename_dqattach(inodes);
171 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 xfs_trans_cancel(tp, cancel_flags);
Christoph Hellwig1ac74e02008-04-22 17:34:12 +1000173 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 }
175
176 /*
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000177 * Lock all the participating inodes. Depending upon whether
178 * the target_name exists in the target directory, and
179 * whether the target directory is the same as the source
180 * directory, we can lock from 2 to 4 inodes.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000182 xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
183
184 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 * Join all the inodes to the transaction. From this point on,
186 * we can rely on either trans_commit or trans_cancel to unlock
187 * them. Note that we need to add a vnode reference to the
188 * directories since trans_commit & trans_cancel will decrement
189 * them when they unlock the inodes. Also, we need to be careful
190 * not to add an inode to the transaction more than once.
191 */
Christoph Hellwig3937be52008-03-06 13:46:19 +1100192 IHOLD(src_dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
Christoph Hellwig1ac74e02008-04-22 17:34:12 +1000194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 if (new_parent) {
Christoph Hellwig3937be52008-03-06 13:46:19 +1100196 IHOLD(target_dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
198 }
Christoph Hellwig1ac74e02008-04-22 17:34:12 +1000199
200 IHOLD(src_ip);
201 xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
202
203 if (target_ip) {
204 IHOLD(target_ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
206 }
207
208 /*
Christoph Hellwig2175dd92008-12-09 04:47:31 -0500209 * If we are using project inheritance, we only allow renames
210 * into our tree when the project IDs are the same; else the
211 * tree quota mechanism would be circumvented.
212 */
213 if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
214 (target_dp->i_d.di_projid != src_ip->i_d.di_projid))) {
215 error = XFS_ERROR(EXDEV);
216 goto error_return;
217 }
218
219 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 * Set up the target.
221 */
222 if (target_ip == NULL) {
223 /*
224 * If there's no space reservation, check the entry will
225 * fit before actually inserting it.
226 */
Barry Naujok556b8b12008-04-10 12:22:07 +1000227 error = xfs_dir_canenter(tp, target_dp, target_name, spaceres);
228 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 goto error_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 /*
231 * If target does not exist and the rename crosses
232 * directories, adjust the target directory link count
233 * to account for the ".." reference from the new entry.
234 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000235 error = xfs_dir_createname(tp, target_dp, target_name,
Barry Naujok556b8b12008-04-10 12:22:07 +1000236 src_ip->i_ino, &first_block,
237 &free_list, spaceres);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000238 if (error == ENOSPC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 goto error_return;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000240 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
243
244 if (new_parent && src_is_directory) {
245 error = xfs_bumplink(tp, target_dp);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000246 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 }
249 } else { /* target_ip != NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 /*
251 * If target exists and it's a directory, check that both
252 * target and source are directories and that target can be
253 * destroyed, or that neither is a directory.
254 */
255 if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
256 /*
257 * Make sure target dir is empty.
258 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000259 if (!(xfs_dir_isempty(target_ip)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 (target_ip->i_d.di_nlink > 2)) {
261 error = XFS_ERROR(EEXIST);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 goto error_return;
263 }
264 }
265
266 /*
267 * Link the source inode under the target name.
268 * If the source inode is a directory and we are moving
269 * it across directories, its ".." entry will be
270 * inconsistent until we replace that down below.
271 *
272 * In case there is already an entry with the same
273 * name at the destination directory, remove it first.
274 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000275 error = xfs_dir_replace(tp, target_dp, target_name,
Barry Naujok556b8b12008-04-10 12:22:07 +1000276 src_ip->i_ino,
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000277 &first_block, &free_list, spaceres);
278 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
281
282 /*
283 * Decrement the link count on the target since the target
284 * dir no longer points to it.
285 */
286 error = xfs_droplink(tp, target_ip);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000287 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290 if (src_is_directory) {
291 /*
292 * Drop the link from the old "." entry.
293 */
294 error = xfs_droplink(tp, target_ip);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000295 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 } /* target_ip != NULL */
299
300 /*
301 * Remove the source.
302 */
303 if (new_parent && src_is_directory) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 /*
305 * Rewrite the ".." entry to point to the new
306 * directory.
307 */
Barry Naujok556b8b12008-04-10 12:22:07 +1000308 error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
309 target_dp->i_ino,
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000310 &first_block, &free_list, spaceres);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 ASSERT(error != EEXIST);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000312 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 }
315
316 /*
Christoph Hellwig8f8670b2008-06-27 13:34:26 +1000317 * We always want to hit the ctime on the source inode.
318 *
319 * This isn't strictly required by the standards since the source
320 * inode isn't really being changed, but old unix file systems did
321 * it and some incremental backup programs won't work without it.
322 */
323 xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG);
324
325 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 * Adjust the link count on src_dp. This is necessary when
327 * renaming a directory, either within one parent when
328 * the target existed, or across two parent directories.
329 */
330 if (src_is_directory && (new_parent || target_ip != NULL)) {
331
332 /*
333 * Decrement link count on src_directory since the
334 * entry that's moved no longer points to it.
335 */
336 error = xfs_droplink(tp, src_dp);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000337 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 }
340
Barry Naujok556b8b12008-04-10 12:22:07 +1000341 error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
342 &first_block, &free_list, spaceres);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000343 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 goto abort_return;
Dave Chinner26c52952008-11-28 14:23:37 +1100345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
Dave Chinner26c52952008-11-28 14:23:37 +1100348 if (new_parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
351 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 * If this is a synchronous mount, make sure that the
353 * rename transaction goes to disk before returning to
354 * the user.
355 */
356 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
357 xfs_trans_set_sync(tp);
358 }
359
Eric Sandeenf7c99b62007-02-10 18:37:16 +1100360 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 if (error) {
362 xfs_bmap_cancel(&free_list);
363 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
364 XFS_TRANS_ABORT));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 goto std_return;
366 }
367
368 /*
369 * trans_commit will unlock src_ip, target_ip & decrement
370 * the vnode references.
371 */
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000372 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
374 /* Fall through to std_return with error = 0 or errno from
375 * xfs_trans_commit */
376std_return:
Christoph Hellwigeb9df392007-08-16 18:42:07 +1000377 if (DM_EVENT_ENABLED(src_dp, DM_EVENT_POSTRENAME) ||
378 DM_EVENT_ENABLED(target_dp, DM_EVENT_POSTRENAME)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 (void) XFS_SEND_NAMESP (mp, DM_EVENT_POSTRENAME,
Christoph Hellwigbc4ac742008-03-06 13:45:58 +1100380 src_dp, DM_RIGHT_NULL,
381 target_dp, DM_RIGHT_NULL,
Barry Naujok556b8b12008-04-10 12:22:07 +1000382 src_name->name, target_name->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 0, error, 0);
384 }
385 return error;
386
387 abort_return:
388 cancel_flags |= XFS_TRANS_ABORT;
389 /* FALLTHROUGH */
390 error_return:
391 xfs_bmap_cancel(&free_list);
392 xfs_trans_cancel(tp, cancel_flags);
393 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394}