Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
1da177e4 | 21 | #include "xfs_log.h" |
a844f451 | 22 | #include "xfs_inum.h" |
1da177e4 LT |
23 | #include "xfs_trans.h" |
24 | #include "xfs_sb.h" | |
da353b0d | 25 | #include "xfs_ag.h" |
1da177e4 | 26 | #include "xfs_dir2.h" |
1da177e4 | 27 | #include "xfs_mount.h" |
a844f451 | 28 | #include "xfs_da_btree.h" |
1da177e4 | 29 | #include "xfs_bmap_btree.h" |
1da177e4 | 30 | #include "xfs_dinode.h" |
1da177e4 | 31 | #include "xfs_inode.h" |
a844f451 | 32 | #include "xfs_inode_item.h" |
1da177e4 LT |
33 | #include "xfs_bmap.h" |
34 | #include "xfs_error.h" | |
35 | #include "xfs_quota.h" | |
1da177e4 LT |
36 | #include "xfs_utils.h" |
37 | #include "xfs_trans_space.h" | |
a8272ce0 | 38 | #include "xfs_vnodeops.h" |
0b1b213f | 39 | #include "xfs_trace.h" |
1da177e4 LT |
40 | |
41 | ||
1da177e4 | 42 | /* |
cfa853e4 | 43 | * Enter all inodes for a rename transaction into a sorted array. |
1da177e4 | 44 | */ |
cfa853e4 CH |
45 | STATIC void |
46 | xfs_sort_for_rename( | |
556b8b16 BN |
47 | 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 */ | |
cfa853e4 | 50 | xfs_inode_t *ip2, /* in: inode of new entry, if it |
1da177e4 | 51 | already exists, NULL otherwise. */ |
556b8b16 BN |
52 | xfs_inode_t **i_tab,/* out: array of inode returned, sorted */ |
53 | int *num_inodes) /* out: number of inodes in array */ | |
1da177e4 | 54 | { |
556b8b16 | 55 | xfs_inode_t *temp; |
1da177e4 | 56 | int i, j; |
1da177e4 LT |
57 | |
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; | |
cfa853e4 | 68 | if (ip2) { |
1da177e4 LT |
69 | *num_inodes = 4; |
70 | i_tab[3] = ip2; | |
cfa853e4 CH |
71 | } else { |
72 | *num_inodes = 3; | |
73 | i_tab[3] = NULL; | |
1da177e4 LT |
74 | } |
75 | ||
76 | /* | |
77 | * Sort the elements via bubble sort. (Remember, there are at | |
78 | * most 4 elements to sort, so this is adequate.) | |
79 | */ | |
cfa853e4 CH |
80 | for (i = 0; i < *num_inodes; i++) { |
81 | for (j = 1; j < *num_inodes; j++) { | |
1da177e4 LT |
82 | 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 | } | |
1da177e4 LT |
89 | } |
90 | ||
1da177e4 LT |
91 | /* |
92 | * xfs_rename | |
93 | */ | |
94 | int | |
95 | xfs_rename( | |
993386c1 | 96 | xfs_inode_t *src_dp, |
556b8b16 BN |
97 | struct xfs_name *src_name, |
98 | xfs_inode_t *src_ip, | |
3937be5b | 99 | xfs_inode_t *target_dp, |
cfa853e4 CH |
100 | struct xfs_name *target_name, |
101 | xfs_inode_t *target_ip) | |
1da177e4 | 102 | { |
cfa853e4 | 103 | xfs_trans_t *tp = NULL; |
993386c1 | 104 | xfs_mount_t *mp = src_dp->i_mount; |
1da177e4 LT |
105 | 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]; | |
1da177e4 | 113 | int spaceres; |
1da177e4 | 114 | int num_inodes; |
1da177e4 | 115 | |
cf441eeb | 116 | xfs_itrace_entry(src_dp); |
3937be5b | 117 | xfs_itrace_entry(target_dp); |
1da177e4 | 118 | |
cfa853e4 CH |
119 | new_parent = (src_dp != target_dp); |
120 | src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR); | |
1da177e4 | 121 | |
cfa853e4 | 122 | if (src_is_directory) { |
1da177e4 LT |
123 | /* |
124 | * Check for link count overflow on target_dp | |
125 | */ | |
cfa853e4 | 126 | if (target_ip == NULL && new_parent && |
1da177e4 | 127 | target_dp->i_d.di_nlink >= XFS_MAXLINK) { |
1da177e4 | 128 | error = XFS_ERROR(EMLINK); |
cfa853e4 | 129 | goto std_return; |
1da177e4 LT |
130 | } |
131 | } | |
132 | ||
cfa853e4 CH |
133 | xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip, |
134 | inodes, &num_inodes); | |
1da177e4 | 135 | |
9d87c319 | 136 | xfs_bmap_init(&free_list, &first_block); |
1da177e4 LT |
137 | tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME); |
138 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
556b8b16 | 139 | spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len); |
1da177e4 LT |
140 | error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0, |
141 | XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT); | |
142 | if (error == ENOSPC) { | |
143 | spaceres = 0; | |
144 | error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0, | |
145 | XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT); | |
146 | } | |
147 | if (error) { | |
1da177e4 | 148 | xfs_trans_cancel(tp, 0); |
1ac74e01 | 149 | goto std_return; |
1da177e4 LT |
150 | } |
151 | ||
152 | /* | |
153 | * Attach the dquots to the inodes | |
154 | */ | |
7d095257 CH |
155 | error = xfs_qm_vop_rename_dqattach(inodes); |
156 | if (error) { | |
1da177e4 | 157 | xfs_trans_cancel(tp, cancel_flags); |
1ac74e01 | 158 | goto std_return; |
1da177e4 LT |
159 | } |
160 | ||
161 | /* | |
cfa853e4 CH |
162 | * Lock all the participating inodes. Depending upon whether |
163 | * the target_name exists in the target directory, and | |
164 | * whether the target directory is the same as the source | |
165 | * directory, we can lock from 2 to 4 inodes. | |
166 | */ | |
167 | xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL); | |
168 | ||
1da177e4 LT |
169 | /* |
170 | * Join all the inodes to the transaction. From this point on, | |
171 | * we can rely on either trans_commit or trans_cancel to unlock | |
172 | * them. Note that we need to add a vnode reference to the | |
173 | * directories since trans_commit & trans_cancel will decrement | |
174 | * them when they unlock the inodes. Also, we need to be careful | |
175 | * not to add an inode to the transaction more than once. | |
176 | */ | |
3937be5b | 177 | IHOLD(src_dp); |
1da177e4 | 178 | xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL); |
1ac74e01 | 179 | |
1da177e4 | 180 | if (new_parent) { |
3937be5b | 181 | IHOLD(target_dp); |
1da177e4 LT |
182 | xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL); |
183 | } | |
1ac74e01 CH |
184 | |
185 | IHOLD(src_ip); | |
186 | xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL); | |
187 | ||
188 | if (target_ip) { | |
189 | IHOLD(target_ip); | |
1da177e4 LT |
190 | xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL); |
191 | } | |
192 | ||
2175dd95 CH |
193 | /* |
194 | * If we are using project inheritance, we only allow renames | |
195 | * into our tree when the project IDs are the same; else the | |
196 | * tree quota mechanism would be circumvented. | |
197 | */ | |
198 | if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && | |
199 | (target_dp->i_d.di_projid != src_ip->i_d.di_projid))) { | |
200 | error = XFS_ERROR(EXDEV); | |
201 | goto error_return; | |
202 | } | |
203 | ||
1da177e4 LT |
204 | /* |
205 | * Set up the target. | |
206 | */ | |
207 | if (target_ip == NULL) { | |
208 | /* | |
209 | * If there's no space reservation, check the entry will | |
210 | * fit before actually inserting it. | |
211 | */ | |
556b8b16 BN |
212 | error = xfs_dir_canenter(tp, target_dp, target_name, spaceres); |
213 | if (error) | |
1da177e4 | 214 | goto error_return; |
1da177e4 LT |
215 | /* |
216 | * If target does not exist and the rename crosses | |
217 | * directories, adjust the target directory link count | |
218 | * to account for the ".." reference from the new entry. | |
219 | */ | |
f6c2d1fa | 220 | error = xfs_dir_createname(tp, target_dp, target_name, |
556b8b16 BN |
221 | src_ip->i_ino, &first_block, |
222 | &free_list, spaceres); | |
f6c2d1fa | 223 | if (error == ENOSPC) |
1da177e4 | 224 | goto error_return; |
f6c2d1fa | 225 | if (error) |
1da177e4 | 226 | goto abort_return; |
1da177e4 LT |
227 | xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
228 | ||
229 | if (new_parent && src_is_directory) { | |
230 | error = xfs_bumplink(tp, target_dp); | |
f6c2d1fa | 231 | if (error) |
1da177e4 | 232 | goto abort_return; |
1da177e4 LT |
233 | } |
234 | } else { /* target_ip != NULL */ | |
1da177e4 LT |
235 | /* |
236 | * If target exists and it's a directory, check that both | |
237 | * target and source are directories and that target can be | |
238 | * destroyed, or that neither is a directory. | |
239 | */ | |
240 | if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) { | |
241 | /* | |
242 | * Make sure target dir is empty. | |
243 | */ | |
f6c2d1fa | 244 | if (!(xfs_dir_isempty(target_ip)) || |
1da177e4 LT |
245 | (target_ip->i_d.di_nlink > 2)) { |
246 | error = XFS_ERROR(EEXIST); | |
1da177e4 LT |
247 | goto error_return; |
248 | } | |
249 | } | |
250 | ||
251 | /* | |
252 | * Link the source inode under the target name. | |
253 | * If the source inode is a directory and we are moving | |
254 | * it across directories, its ".." entry will be | |
255 | * inconsistent until we replace that down below. | |
256 | * | |
257 | * In case there is already an entry with the same | |
258 | * name at the destination directory, remove it first. | |
259 | */ | |
f6c2d1fa | 260 | error = xfs_dir_replace(tp, target_dp, target_name, |
556b8b16 | 261 | src_ip->i_ino, |
f6c2d1fa NS |
262 | &first_block, &free_list, spaceres); |
263 | if (error) | |
1da177e4 | 264 | goto abort_return; |
1da177e4 LT |
265 | xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
266 | ||
267 | /* | |
268 | * Decrement the link count on the target since the target | |
269 | * dir no longer points to it. | |
270 | */ | |
271 | error = xfs_droplink(tp, target_ip); | |
f6c2d1fa | 272 | if (error) |
1da177e4 | 273 | goto abort_return; |
1da177e4 LT |
274 | |
275 | if (src_is_directory) { | |
276 | /* | |
277 | * Drop the link from the old "." entry. | |
278 | */ | |
279 | error = xfs_droplink(tp, target_ip); | |
f6c2d1fa | 280 | if (error) |
1da177e4 | 281 | goto abort_return; |
1da177e4 | 282 | } |
1da177e4 LT |
283 | } /* target_ip != NULL */ |
284 | ||
285 | /* | |
286 | * Remove the source. | |
287 | */ | |
288 | if (new_parent && src_is_directory) { | |
1da177e4 LT |
289 | /* |
290 | * Rewrite the ".." entry to point to the new | |
291 | * directory. | |
292 | */ | |
556b8b16 BN |
293 | error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot, |
294 | target_dp->i_ino, | |
f6c2d1fa | 295 | &first_block, &free_list, spaceres); |
1da177e4 | 296 | ASSERT(error != EEXIST); |
f6c2d1fa | 297 | if (error) |
1da177e4 | 298 | goto abort_return; |
1da177e4 LT |
299 | } |
300 | ||
8f8670bb CH |
301 | /* |
302 | * We always want to hit the ctime on the source inode. | |
303 | * | |
304 | * This isn't strictly required by the standards since the source | |
305 | * inode isn't really being changed, but old unix file systems did | |
306 | * it and some incremental backup programs won't work without it. | |
307 | */ | |
308 | xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG); | |
309 | ||
1da177e4 LT |
310 | /* |
311 | * Adjust the link count on src_dp. This is necessary when | |
312 | * renaming a directory, either within one parent when | |
313 | * the target existed, or across two parent directories. | |
314 | */ | |
315 | if (src_is_directory && (new_parent || target_ip != NULL)) { | |
316 | ||
317 | /* | |
318 | * Decrement link count on src_directory since the | |
319 | * entry that's moved no longer points to it. | |
320 | */ | |
321 | error = xfs_droplink(tp, src_dp); | |
f6c2d1fa | 322 | if (error) |
1da177e4 | 323 | goto abort_return; |
1da177e4 LT |
324 | } |
325 | ||
556b8b16 BN |
326 | error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino, |
327 | &first_block, &free_list, spaceres); | |
f6c2d1fa | 328 | if (error) |
1da177e4 | 329 | goto abort_return; |
1da177e4 | 330 | |
26c52951 | 331 | xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
1da177e4 | 332 | xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE); |
26c52951 | 333 | if (new_parent) |
1da177e4 | 334 | xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE); |
1da177e4 | 335 | |
1da177e4 LT |
336 | /* |
337 | * If this is a synchronous mount, make sure that the | |
338 | * rename transaction goes to disk before returning to | |
339 | * the user. | |
340 | */ | |
341 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
342 | xfs_trans_set_sync(tp); | |
343 | } | |
344 | ||
f7c99b6f | 345 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
1da177e4 LT |
346 | if (error) { |
347 | xfs_bmap_cancel(&free_list); | |
348 | xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | | |
349 | XFS_TRANS_ABORT)); | |
1da177e4 LT |
350 | goto std_return; |
351 | } | |
352 | ||
353 | /* | |
354 | * trans_commit will unlock src_ip, target_ip & decrement | |
355 | * the vnode references. | |
356 | */ | |
288699fe | 357 | return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
358 | |
359 | abort_return: | |
360 | cancel_flags |= XFS_TRANS_ABORT; | |
1da177e4 LT |
361 | error_return: |
362 | xfs_bmap_cancel(&free_list); | |
363 | xfs_trans_cancel(tp, cancel_flags); | |
288699fe CH |
364 | std_return: |
365 | return error; | |
1da177e4 | 366 | } |