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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"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#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_dinode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110032#include "xfs_inode_item.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "xfs_bmap.h"
34#include "xfs_error.h"
35#include "xfs_quota.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "xfs_utils.h"
37#include "xfs_trans_space.h"
David Chinnera8272ce2007-11-23 16:28:09 +110038#include "xfs_vnodeops.h"
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000039#include "xfs_trace.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41
42/*
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100043 * Enter all inodes for a rename transaction into a sorted array.
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100045STATIC void
46xfs_sort_for_rename(
Barry Naujok556b8b12008-04-10 12:22:07 +100047 xfs_inode_t *dp1, /* in: old (source) directory inode */
48 xfs_inode_t *dp2, /* in: new (target) directory inode */
49 xfs_inode_t *ip1, /* in: inode of old entry */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100050 xfs_inode_t *ip2, /* in: inode of new entry, if it
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 already exists, NULL otherwise. */
Barry Naujok556b8b12008-04-10 12:22:07 +100052 xfs_inode_t **i_tab,/* out: array of inode returned, sorted */
53 int *num_inodes) /* out: number of inodes in array */
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
Barry Naujok556b8b12008-04-10 12:22:07 +100055 xfs_inode_t *temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 int i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58 /*
59 * i_tab contains a list of pointers to inodes. We initialize
60 * the table here & we'll sort it. We will then use it to
61 * order the acquisition of the inode locks.
62 *
63 * Note that the table may contain duplicates. e.g., dp1 == dp2.
64 */
65 i_tab[0] = dp1;
66 i_tab[1] = dp2;
67 i_tab[2] = ip1;
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100068 if (ip2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 *num_inodes = 4;
70 i_tab[3] = ip2;
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100071 } else {
72 *num_inodes = 3;
73 i_tab[3] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 }
75
76 /*
77 * Sort the elements via bubble sort. (Remember, there are at
78 * most 4 elements to sort, so this is adequate.)
79 */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100080 for (i = 0; i < *num_inodes; i++) {
81 for (j = 1; j < *num_inodes; j++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
83 temp = i_tab[j];
84 i_tab[j] = i_tab[j-1];
85 i_tab[j-1] = temp;
86 }
87 }
88 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070089}
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091/*
92 * xfs_rename
93 */
94int
95xfs_rename(
Christoph Hellwig993386c2007-08-28 16:12:30 +100096 xfs_inode_t *src_dp,
Barry Naujok556b8b12008-04-10 12:22:07 +100097 struct xfs_name *src_name,
98 xfs_inode_t *src_ip,
Christoph Hellwig3937be52008-03-06 13:46:19 +110099 xfs_inode_t *target_dp,
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000100 struct xfs_name *target_name,
101 xfs_inode_t *target_ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000103 xfs_trans_t *tp = NULL;
Christoph Hellwig993386c2007-08-28 16:12:30 +1000104 xfs_mount_t *mp = src_dp->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 int new_parent; /* moving to a new dir */
106 int src_is_directory; /* src_name is a directory */
107 int error;
108 xfs_bmap_free_t free_list;
109 xfs_fsblock_t first_block;
110 int cancel_flags;
111 int committed;
112 xfs_inode_t *inodes[4];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 int spaceres;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 int num_inodes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Christoph Hellwigcca28fb2010-06-24 11:57:09 +1000116 trace_xfs_rename(src_dp, target_dp, src_name, target_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 new_parent = (src_dp != target_dp);
Al Viroabbede12011-07-26 02:31:30 -0400119 src_is_directory = S_ISDIR(src_ip->i_d.di_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000121 if (src_is_directory) {
122 /*
123 * Check for link count overflow on target_dp
124 */
125 if (target_ip == NULL && new_parent &&
126 target_dp->i_d.di_nlink >= XFS_MAXLINK) {
127 error = XFS_ERROR(EMLINK);
128 goto std_return;
129 }
130 }
131
132 xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
133 inodes, &num_inodes);
134
Eric Sandeen9d87c312009-01-14 23:22:07 -0600135 xfs_bmap_init(&free_list, &first_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
137 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
Barry Naujok556b8b12008-04-10 12:22:07 +1000138 spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
140 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
141 if (error == ENOSPC) {
142 spaceres = 0;
143 error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
144 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
145 }
146 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 xfs_trans_cancel(tp, 0);
Christoph Hellwig1ac74e02008-04-22 17:34:12 +1000148 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 }
150
151 /*
152 * Attach the dquots to the inodes
153 */
Christoph Hellwig7d095252009-06-08 15:33:32 +0200154 error = xfs_qm_vop_rename_dqattach(inodes);
155 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 xfs_trans_cancel(tp, cancel_flags);
Christoph Hellwig1ac74e02008-04-22 17:34:12 +1000157 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 }
159
160 /*
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000161 * Lock all the participating inodes. Depending upon whether
162 * the target_name exists in the target directory, and
163 * whether the target directory is the same as the source
164 * directory, we can lock from 2 to 4 inodes.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000166 xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
167
168 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 * Join all the inodes to the transaction. From this point on,
170 * we can rely on either trans_commit or trans_cancel to unlock
Christoph Hellwig898621d2010-06-24 11:36:58 +1000171 * them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 */
Christoph Hellwigddc34152011-09-19 15:00:54 +0000173 xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
Christoph Hellwig898621d2010-06-24 11:36:58 +1000174 if (new_parent)
Christoph Hellwigddc34152011-09-19 15:00:54 +0000175 xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
176 xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
Christoph Hellwig898621d2010-06-24 11:36:58 +1000177 if (target_ip)
Christoph Hellwigddc34152011-09-19 15:00:54 +0000178 xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 /*
Christoph Hellwig2175dd92008-12-09 04:47:31 -0500181 * If we are using project inheritance, we only allow renames
182 * into our tree when the project IDs are the same; else the
183 * tree quota mechanism would be circumvented.
184 */
185 if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
Arkadiusz Mi?kiewicz67430992010-09-26 06:10:18 +0000186 (xfs_get_projid(target_dp) != xfs_get_projid(src_ip)))) {
Christoph Hellwig2175dd92008-12-09 04:47:31 -0500187 error = XFS_ERROR(EXDEV);
188 goto error_return;
189 }
190
191 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 * Set up the target.
193 */
194 if (target_ip == NULL) {
195 /*
196 * If there's no space reservation, check the entry will
197 * fit before actually inserting it.
198 */
Barry Naujok556b8b12008-04-10 12:22:07 +1000199 error = xfs_dir_canenter(tp, target_dp, target_name, spaceres);
200 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 goto error_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 /*
203 * If target does not exist and the rename crosses
204 * directories, adjust the target directory link count
205 * to account for the ".." reference from the new entry.
206 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000207 error = xfs_dir_createname(tp, target_dp, target_name,
Barry Naujok556b8b12008-04-10 12:22:07 +1000208 src_ip->i_ino, &first_block,
209 &free_list, spaceres);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000210 if (error == ENOSPC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 goto error_return;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000212 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 goto abort_return;
Dave Chinnerdcd79a12010-09-28 12:27:25 +1000214
215 xfs_trans_ichgtime(tp, target_dp,
216 XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218 if (new_parent && src_is_directory) {
219 error = xfs_bumplink(tp, target_dp);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000220 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 }
223 } else { /* target_ip != NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 /*
225 * If target exists and it's a directory, check that both
226 * target and source are directories and that target can be
227 * destroyed, or that neither is a directory.
228 */
Al Viroabbede12011-07-26 02:31:30 -0400229 if (S_ISDIR(target_ip->i_d.di_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 /*
231 * Make sure target dir is empty.
232 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000233 if (!(xfs_dir_isempty(target_ip)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 (target_ip->i_d.di_nlink > 2)) {
235 error = XFS_ERROR(EEXIST);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 goto error_return;
237 }
238 }
239
240 /*
241 * Link the source inode under the target name.
242 * If the source inode is a directory and we are moving
243 * it across directories, its ".." entry will be
244 * inconsistent until we replace that down below.
245 *
246 * In case there is already an entry with the same
247 * name at the destination directory, remove it first.
248 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000249 error = xfs_dir_replace(tp, target_dp, target_name,
Barry Naujok556b8b12008-04-10 12:22:07 +1000250 src_ip->i_ino,
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000251 &first_block, &free_list, spaceres);
252 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 goto abort_return;
Dave Chinnerdcd79a12010-09-28 12:27:25 +1000254
255 xfs_trans_ichgtime(tp, target_dp,
256 XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258 /*
259 * Decrement the link count on the target since the target
260 * dir no longer points to it.
261 */
262 error = xfs_droplink(tp, target_ip);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000263 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266 if (src_is_directory) {
267 /*
268 * Drop the link from the old "." entry.
269 */
270 error = xfs_droplink(tp, target_ip);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000271 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 } /* target_ip != NULL */
275
276 /*
277 * Remove the source.
278 */
279 if (new_parent && src_is_directory) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 /*
281 * Rewrite the ".." entry to point to the new
282 * directory.
283 */
Barry Naujok556b8b12008-04-10 12:22:07 +1000284 error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
285 target_dp->i_ino,
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000286 &first_block, &free_list, spaceres);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 ASSERT(error != EEXIST);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000288 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 }
291
292 /*
Christoph Hellwig8f8670b2008-06-27 13:34:26 +1000293 * We always want to hit the ctime on the source inode.
294 *
295 * This isn't strictly required by the standards since the source
296 * inode isn't really being changed, but old unix file systems did
297 * it and some incremental backup programs won't work without it.
298 */
Dave Chinnerdcd79a12010-09-28 12:27:25 +1000299 xfs_trans_ichgtime(tp, src_ip, XFS_ICHGTIME_CHG);
Christoph Hellwig05340d42010-12-07 10:16:41 +0000300 xfs_trans_log_inode(tp, src_ip, XFS_ILOG_CORE);
Christoph Hellwig8f8670b2008-06-27 13:34:26 +1000301
302 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 * Adjust the link count on src_dp. This is necessary when
304 * renaming a directory, either within one parent when
305 * the target existed, or across two parent directories.
306 */
307 if (src_is_directory && (new_parent || target_ip != NULL)) {
308
309 /*
310 * Decrement link count on src_directory since the
311 * entry that's moved no longer points to it.
312 */
313 error = xfs_droplink(tp, src_dp);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000314 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 }
317
Barry Naujok556b8b12008-04-10 12:22:07 +1000318 error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
319 &first_block, &free_list, spaceres);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000320 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 goto abort_return;
Dave Chinner26c52952008-11-28 14:23:37 +1100322
Dave Chinnerdcd79a12010-09-28 12:27:25 +1000323 xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
Dave Chinner26c52952008-11-28 14:23:37 +1100325 if (new_parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 * If this is a synchronous mount, make sure that the
330 * rename transaction goes to disk before returning to
331 * the user.
332 */
333 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
334 xfs_trans_set_sync(tp);
335 }
336
Eric Sandeenf7c99b62007-02-10 18:37:16 +1100337 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 if (error) {
339 xfs_bmap_cancel(&free_list);
340 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
341 XFS_TRANS_ABORT));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 goto std_return;
343 }
344
345 /*
346 * trans_commit will unlock src_ip, target_ip & decrement
347 * the vnode references.
348 */
Christoph Hellwig288699f2010-06-23 18:11:15 +1000349 return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
351 abort_return:
352 cancel_flags |= XFS_TRANS_ABORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 error_return:
354 xfs_bmap_cancel(&free_list);
355 xfs_trans_cancel(tp, cancel_flags);
Christoph Hellwig288699f2010-06-23 18:11:15 +1000356 std_return:
357 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358}