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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"
22#include "xfs_trans.h"
23#include "xfs_sb.h"
David Chinnerda353b02007-08-28 14:00:13 +100024#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include "xfs_dir2.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "xfs_mount.h"
Nathan Scotta844f452005-11-02 14:38:42 +110027#include "xfs_da_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include "xfs_bmap_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include "xfs_dinode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110031#include "xfs_inode_item.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include "xfs_bmap.h"
33#include "xfs_error.h"
34#include "xfs_quota.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include "xfs_utils.h"
36#include "xfs_trans_space.h"
David Chinnera8272ce2007-11-23 16:28:09 +110037#include "xfs_vnodeops.h"
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000038#include "xfs_trace.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40
41/*
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100042 * Enter all inodes for a rename transaction into a sorted array.
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100044STATIC void
45xfs_sort_for_rename(
Barry Naujok556b8b12008-04-10 12:22:07 +100046 xfs_inode_t *dp1, /* in: old (source) directory inode */
47 xfs_inode_t *dp2, /* in: new (target) directory inode */
48 xfs_inode_t *ip1, /* in: inode of old entry */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100049 xfs_inode_t *ip2, /* in: inode of new entry, if it
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 already exists, NULL otherwise. */
Barry Naujok556b8b12008-04-10 12:22:07 +100051 xfs_inode_t **i_tab,/* out: array of inode returned, sorted */
52 int *num_inodes) /* out: number of inodes in array */
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
Barry Naujok556b8b12008-04-10 12:22:07 +100054 xfs_inode_t *temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 int i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57 /*
58 * i_tab contains a list of pointers to inodes. We initialize
59 * the table here & we'll sort it. We will then use it to
60 * order the acquisition of the inode locks.
61 *
62 * Note that the table may contain duplicates. e.g., dp1 == dp2.
63 */
64 i_tab[0] = dp1;
65 i_tab[1] = dp2;
66 i_tab[2] = ip1;
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100067 if (ip2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 *num_inodes = 4;
69 i_tab[3] = ip2;
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100070 } else {
71 *num_inodes = 3;
72 i_tab[3] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 }
74
75 /*
76 * Sort the elements via bubble sort. (Remember, there are at
77 * most 4 elements to sort, so this is adequate.)
78 */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100079 for (i = 0; i < *num_inodes; i++) {
80 for (j = 1; j < *num_inodes; j++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
82 temp = i_tab[j];
83 i_tab[j] = i_tab[j-1];
84 i_tab[j-1] = temp;
85 }
86 }
87 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090/*
91 * xfs_rename
92 */
93int
94xfs_rename(
Christoph Hellwig993386c2007-08-28 16:12:30 +100095 xfs_inode_t *src_dp,
Barry Naujok556b8b12008-04-10 12:22:07 +100096 struct xfs_name *src_name,
97 xfs_inode_t *src_ip,
Christoph Hellwig3937be52008-03-06 13:46:19 +110098 xfs_inode_t *target_dp,
Christoph Hellwigcfa853e2008-04-22 17:34:06 +100099 struct xfs_name *target_name,
100 xfs_inode_t *target_ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000102 xfs_trans_t *tp = NULL;
Christoph Hellwig993386c2007-08-28 16:12:30 +1000103 xfs_mount_t *mp = src_dp->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 int new_parent; /* moving to a new dir */
105 int src_is_directory; /* src_name is a directory */
106 int error;
107 xfs_bmap_free_t free_list;
108 xfs_fsblock_t first_block;
109 int cancel_flags;
110 int committed;
111 xfs_inode_t *inodes[4];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 int spaceres;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 int num_inodes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Christoph Hellwigcca28fb2010-06-24 11:57:09 +1000115 trace_xfs_rename(src_dp, target_dp, src_name, target_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 new_parent = (src_dp != target_dp);
Al Viroabbede12011-07-26 02:31:30 -0400118 src_is_directory = S_ISDIR(src_ip->i_d.di_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000120 xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
121 inodes, &num_inodes);
122
Eric Sandeen9d87c312009-01-14 23:22:07 -0600123 xfs_bmap_init(&free_list, &first_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
125 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
Barry Naujok556b8b12008-04-10 12:22:07 +1000126 spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
128 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
129 if (error == ENOSPC) {
130 spaceres = 0;
131 error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
132 XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
133 }
134 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 xfs_trans_cancel(tp, 0);
Christoph Hellwig1ac74e02008-04-22 17:34:12 +1000136 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 }
138
139 /*
140 * Attach the dquots to the inodes
141 */
Christoph Hellwig7d095252009-06-08 15:33:32 +0200142 error = xfs_qm_vop_rename_dqattach(inodes);
143 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 xfs_trans_cancel(tp, cancel_flags);
Christoph Hellwig1ac74e02008-04-22 17:34:12 +1000145 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 }
147
148 /*
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000149 * Lock all the participating inodes. Depending upon whether
150 * the target_name exists in the target directory, and
151 * whether the target directory is the same as the source
152 * directory, we can lock from 2 to 4 inodes.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 */
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000154 xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
155
156 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 * Join all the inodes to the transaction. From this point on,
158 * we can rely on either trans_commit or trans_cancel to unlock
Christoph Hellwig898621d2010-06-24 11:36:58 +1000159 * them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 */
Christoph Hellwigddc34152011-09-19 15:00:54 +0000161 xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
Christoph Hellwig898621d2010-06-24 11:36:58 +1000162 if (new_parent)
Christoph Hellwigddc34152011-09-19 15:00:54 +0000163 xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
164 xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
Christoph Hellwig898621d2010-06-24 11:36:58 +1000165 if (target_ip)
Christoph Hellwigddc34152011-09-19 15:00:54 +0000166 xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
168 /*
Christoph Hellwig2175dd92008-12-09 04:47:31 -0500169 * If we are using project inheritance, we only allow renames
170 * into our tree when the project IDs are the same; else the
171 * tree quota mechanism would be circumvented.
172 */
173 if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
Arkadiusz Mi?kiewicz67430992010-09-26 06:10:18 +0000174 (xfs_get_projid(target_dp) != xfs_get_projid(src_ip)))) {
Christoph Hellwig2175dd92008-12-09 04:47:31 -0500175 error = XFS_ERROR(EXDEV);
176 goto error_return;
177 }
178
179 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 * Set up the target.
181 */
182 if (target_ip == NULL) {
183 /*
184 * If there's no space reservation, check the entry will
185 * fit before actually inserting it.
186 */
Barry Naujok556b8b12008-04-10 12:22:07 +1000187 error = xfs_dir_canenter(tp, target_dp, target_name, spaceres);
188 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 goto error_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 /*
191 * If target does not exist and the rename crosses
192 * directories, adjust the target directory link count
193 * to account for the ".." reference from the new entry.
194 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000195 error = xfs_dir_createname(tp, target_dp, target_name,
Barry Naujok556b8b12008-04-10 12:22:07 +1000196 src_ip->i_ino, &first_block,
197 &free_list, spaceres);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000198 if (error == ENOSPC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 goto error_return;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000200 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 goto abort_return;
Dave Chinnerdcd79a12010-09-28 12:27:25 +1000202
203 xfs_trans_ichgtime(tp, target_dp,
204 XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206 if (new_parent && src_is_directory) {
207 error = xfs_bumplink(tp, target_dp);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000208 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 }
211 } else { /* target_ip != NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 /*
213 * If target exists and it's a directory, check that both
214 * target and source are directories and that target can be
215 * destroyed, or that neither is a directory.
216 */
Al Viroabbede12011-07-26 02:31:30 -0400217 if (S_ISDIR(target_ip->i_d.di_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 /*
219 * Make sure target dir is empty.
220 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000221 if (!(xfs_dir_isempty(target_ip)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 (target_ip->i_d.di_nlink > 2)) {
223 error = XFS_ERROR(EEXIST);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 goto error_return;
225 }
226 }
227
228 /*
229 * Link the source inode under the target name.
230 * If the source inode is a directory and we are moving
231 * it across directories, its ".." entry will be
232 * inconsistent until we replace that down below.
233 *
234 * In case there is already an entry with the same
235 * name at the destination directory, remove it first.
236 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000237 error = xfs_dir_replace(tp, target_dp, target_name,
Barry Naujok556b8b12008-04-10 12:22:07 +1000238 src_ip->i_ino,
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000239 &first_block, &free_list, spaceres);
240 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 goto abort_return;
Dave Chinnerdcd79a12010-09-28 12:27:25 +1000242
243 xfs_trans_ichgtime(tp, target_dp,
244 XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
246 /*
247 * Decrement the link count on the target since the target
248 * dir no longer points to it.
249 */
250 error = xfs_droplink(tp, target_ip);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000251 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254 if (src_is_directory) {
255 /*
256 * Drop the link from the old "." entry.
257 */
258 error = xfs_droplink(tp, target_ip);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000259 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 } /* target_ip != NULL */
263
264 /*
265 * Remove the source.
266 */
267 if (new_parent && src_is_directory) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 /*
269 * Rewrite the ".." entry to point to the new
270 * directory.
271 */
Barry Naujok556b8b12008-04-10 12:22:07 +1000272 error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
273 target_dp->i_ino,
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000274 &first_block, &free_list, spaceres);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 ASSERT(error != EEXIST);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000276 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 }
279
280 /*
Christoph Hellwig8f8670b2008-06-27 13:34:26 +1000281 * We always want to hit the ctime on the source inode.
282 *
283 * This isn't strictly required by the standards since the source
284 * inode isn't really being changed, but old unix file systems did
285 * it and some incremental backup programs won't work without it.
286 */
Dave Chinnerdcd79a12010-09-28 12:27:25 +1000287 xfs_trans_ichgtime(tp, src_ip, XFS_ICHGTIME_CHG);
Christoph Hellwig05340d42010-12-07 10:16:41 +0000288 xfs_trans_log_inode(tp, src_ip, XFS_ILOG_CORE);
Christoph Hellwig8f8670b2008-06-27 13:34:26 +1000289
290 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 * Adjust the link count on src_dp. This is necessary when
292 * renaming a directory, either within one parent when
293 * the target existed, or across two parent directories.
294 */
295 if (src_is_directory && (new_parent || target_ip != NULL)) {
296
297 /*
298 * Decrement link count on src_directory since the
299 * entry that's moved no longer points to it.
300 */
301 error = xfs_droplink(tp, src_dp);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000302 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 }
305
Barry Naujok556b8b12008-04-10 12:22:07 +1000306 error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
307 &first_block, &free_list, spaceres);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000308 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 goto abort_return;
Dave Chinner26c52952008-11-28 14:23:37 +1100310
Dave Chinnerdcd79a12010-09-28 12:27:25 +1000311 xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
Dave Chinner26c52952008-11-28 14:23:37 +1100313 if (new_parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
316 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 * If this is a synchronous mount, make sure that the
318 * rename transaction goes to disk before returning to
319 * the user.
320 */
321 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
322 xfs_trans_set_sync(tp);
323 }
324
Eric Sandeenf7c99b62007-02-10 18:37:16 +1100325 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 if (error) {
327 xfs_bmap_cancel(&free_list);
328 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
329 XFS_TRANS_ABORT));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 goto std_return;
331 }
332
333 /*
334 * trans_commit will unlock src_ip, target_ip & decrement
335 * the vnode references.
336 */
Christoph Hellwig288699f2010-06-23 18:11:15 +1000337 return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339 abort_return:
340 cancel_flags |= XFS_TRANS_ABORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 error_return:
342 xfs_bmap_cancel(&free_list);
343 xfs_trans_cancel(tp, cancel_flags);
Christoph Hellwig288699f2010-06-23 18:11:15 +1000344 std_return:
345 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346}