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 LT |
26 | #include "xfs_dir2.h" |
27 | #include "xfs_dmapi.h" | |
28 | #include "xfs_mount.h" | |
a844f451 | 29 | #include "xfs_da_btree.h" |
1da177e4 | 30 | #include "xfs_bmap_btree.h" |
1da177e4 | 31 | #include "xfs_dir2_sf.h" |
a844f451 | 32 | #include "xfs_attr_sf.h" |
1da177e4 | 33 | #include "xfs_dinode.h" |
1da177e4 | 34 | #include "xfs_inode.h" |
a844f451 | 35 | #include "xfs_inode_item.h" |
1da177e4 LT |
36 | #include "xfs_bmap.h" |
37 | #include "xfs_error.h" | |
38 | #include "xfs_quota.h" | |
1da177e4 LT |
39 | #include "xfs_utils.h" |
40 | #include "xfs_trans_space.h" | |
a8272ce0 | 41 | #include "xfs_vnodeops.h" |
0b1b213f | 42 | #include "xfs_trace.h" |
1da177e4 LT |
43 | |
44 | ||
1da177e4 | 45 | /* |
cfa853e4 | 46 | * Enter all inodes for a rename transaction into a sorted array. |
1da177e4 | 47 | */ |
cfa853e4 CH |
48 | STATIC void |
49 | xfs_sort_for_rename( | |
556b8b16 BN |
50 | 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 */ | |
cfa853e4 | 53 | xfs_inode_t *ip2, /* in: inode of new entry, if it |
1da177e4 | 54 | already exists, NULL otherwise. */ |
556b8b16 BN |
55 | xfs_inode_t **i_tab,/* out: array of inode returned, sorted */ |
56 | int *num_inodes) /* out: number of inodes in array */ | |
1da177e4 | 57 | { |
556b8b16 | 58 | xfs_inode_t *temp; |
1da177e4 | 59 | int i, j; |
1da177e4 LT |
60 | |
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; | |
cfa853e4 | 71 | if (ip2) { |
1da177e4 LT |
72 | *num_inodes = 4; |
73 | i_tab[3] = ip2; | |
cfa853e4 CH |
74 | } else { |
75 | *num_inodes = 3; | |
76 | i_tab[3] = NULL; | |
1da177e4 LT |
77 | } |
78 | ||
79 | /* | |
80 | * Sort the elements via bubble sort. (Remember, there are at | |
81 | * most 4 elements to sort, so this is adequate.) | |
82 | */ | |
cfa853e4 CH |
83 | for (i = 0; i < *num_inodes; i++) { |
84 | for (j = 1; j < *num_inodes; j++) { | |
1da177e4 LT |
85 | 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 | } | |
1da177e4 LT |
92 | } |
93 | ||
1da177e4 LT |
94 | /* |
95 | * xfs_rename | |
96 | */ | |
97 | int | |
98 | xfs_rename( | |
993386c1 | 99 | xfs_inode_t *src_dp, |
556b8b16 BN |
100 | struct xfs_name *src_name, |
101 | xfs_inode_t *src_ip, | |
3937be5b | 102 | xfs_inode_t *target_dp, |
cfa853e4 CH |
103 | struct xfs_name *target_name, |
104 | xfs_inode_t *target_ip) | |
1da177e4 | 105 | { |
cfa853e4 | 106 | xfs_trans_t *tp = NULL; |
993386c1 | 107 | xfs_mount_t *mp = src_dp->i_mount; |
1da177e4 LT |
108 | 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]; | |
1da177e4 | 116 | int spaceres; |
1da177e4 | 117 | int num_inodes; |
1da177e4 | 118 | |
cf441eeb | 119 | xfs_itrace_entry(src_dp); |
3937be5b | 120 | xfs_itrace_entry(target_dp); |
1da177e4 | 121 | |
eb9df39d CH |
122 | if (DM_EVENT_ENABLED(src_dp, DM_EVENT_RENAME) || |
123 | DM_EVENT_ENABLED(target_dp, DM_EVENT_RENAME)) { | |
1da177e4 | 124 | error = XFS_SEND_NAMESP(mp, DM_EVENT_RENAME, |
bc4ac74a CH |
125 | src_dp, DM_RIGHT_NULL, |
126 | target_dp, DM_RIGHT_NULL, | |
556b8b16 | 127 | src_name->name, target_name->name, |
1da177e4 | 128 | 0, 0, 0); |
cfa853e4 | 129 | if (error) |
1da177e4 | 130 | return error; |
1da177e4 LT |
131 | } |
132 | /* Return through std_return after this point. */ | |
133 | ||
cfa853e4 CH |
134 | new_parent = (src_dp != target_dp); |
135 | src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR); | |
1da177e4 | 136 | |
cfa853e4 | 137 | if (src_is_directory) { |
1da177e4 LT |
138 | /* |
139 | * Check for link count overflow on target_dp | |
140 | */ | |
cfa853e4 | 141 | if (target_ip == NULL && new_parent && |
1da177e4 | 142 | target_dp->i_d.di_nlink >= XFS_MAXLINK) { |
1da177e4 | 143 | error = XFS_ERROR(EMLINK); |
cfa853e4 | 144 | goto std_return; |
1da177e4 LT |
145 | } |
146 | } | |
147 | ||
cfa853e4 CH |
148 | xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip, |
149 | inodes, &num_inodes); | |
1da177e4 | 150 | |
9d87c319 | 151 | xfs_bmap_init(&free_list, &first_block); |
1da177e4 LT |
152 | tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME); |
153 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
556b8b16 | 154 | spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len); |
1da177e4 LT |
155 | 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) { | |
1da177e4 | 163 | xfs_trans_cancel(tp, 0); |
1ac74e01 | 164 | goto std_return; |
1da177e4 LT |
165 | } |
166 | ||
167 | /* | |
168 | * Attach the dquots to the inodes | |
169 | */ | |
7d095257 CH |
170 | error = xfs_qm_vop_rename_dqattach(inodes); |
171 | if (error) { | |
1da177e4 | 172 | xfs_trans_cancel(tp, cancel_flags); |
1ac74e01 | 173 | goto std_return; |
1da177e4 LT |
174 | } |
175 | ||
176 | /* | |
cfa853e4 CH |
177 | * 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. | |
181 | */ | |
182 | xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL); | |
183 | ||
1da177e4 LT |
184 | /* |
185 | * 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 | */ | |
3937be5b | 192 | IHOLD(src_dp); |
1da177e4 | 193 | xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL); |
1ac74e01 | 194 | |
1da177e4 | 195 | if (new_parent) { |
3937be5b | 196 | IHOLD(target_dp); |
1da177e4 LT |
197 | xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL); |
198 | } | |
1ac74e01 CH |
199 | |
200 | IHOLD(src_ip); | |
201 | xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL); | |
202 | ||
203 | if (target_ip) { | |
204 | IHOLD(target_ip); | |
1da177e4 LT |
205 | xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL); |
206 | } | |
207 | ||
2175dd95 CH |
208 | /* |
209 | * 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 | ||
1da177e4 LT |
219 | /* |
220 | * 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 | */ | |
556b8b16 BN |
227 | error = xfs_dir_canenter(tp, target_dp, target_name, spaceres); |
228 | if (error) | |
1da177e4 | 229 | goto error_return; |
1da177e4 LT |
230 | /* |
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 | */ | |
f6c2d1fa | 235 | error = xfs_dir_createname(tp, target_dp, target_name, |
556b8b16 BN |
236 | src_ip->i_ino, &first_block, |
237 | &free_list, spaceres); | |
f6c2d1fa | 238 | if (error == ENOSPC) |
1da177e4 | 239 | goto error_return; |
f6c2d1fa | 240 | if (error) |
1da177e4 | 241 | goto abort_return; |
1da177e4 LT |
242 | 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); | |
f6c2d1fa | 246 | if (error) |
1da177e4 | 247 | goto abort_return; |
1da177e4 LT |
248 | } |
249 | } else { /* target_ip != NULL */ | |
1da177e4 LT |
250 | /* |
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 | */ | |
f6c2d1fa | 259 | if (!(xfs_dir_isempty(target_ip)) || |
1da177e4 LT |
260 | (target_ip->i_d.di_nlink > 2)) { |
261 | error = XFS_ERROR(EEXIST); | |
1da177e4 LT |
262 | 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 | */ | |
f6c2d1fa | 275 | error = xfs_dir_replace(tp, target_dp, target_name, |
556b8b16 | 276 | src_ip->i_ino, |
f6c2d1fa NS |
277 | &first_block, &free_list, spaceres); |
278 | if (error) | |
1da177e4 | 279 | goto abort_return; |
1da177e4 LT |
280 | 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); | |
f6c2d1fa | 287 | if (error) |
1da177e4 | 288 | goto abort_return; |
1da177e4 LT |
289 | |
290 | if (src_is_directory) { | |
291 | /* | |
292 | * Drop the link from the old "." entry. | |
293 | */ | |
294 | error = xfs_droplink(tp, target_ip); | |
f6c2d1fa | 295 | if (error) |
1da177e4 | 296 | goto abort_return; |
1da177e4 | 297 | } |
1da177e4 LT |
298 | } /* target_ip != NULL */ |
299 | ||
300 | /* | |
301 | * Remove the source. | |
302 | */ | |
303 | if (new_parent && src_is_directory) { | |
1da177e4 LT |
304 | /* |
305 | * Rewrite the ".." entry to point to the new | |
306 | * directory. | |
307 | */ | |
556b8b16 BN |
308 | error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot, |
309 | target_dp->i_ino, | |
f6c2d1fa | 310 | &first_block, &free_list, spaceres); |
1da177e4 | 311 | ASSERT(error != EEXIST); |
f6c2d1fa | 312 | if (error) |
1da177e4 | 313 | goto abort_return; |
1da177e4 LT |
314 | } |
315 | ||
8f8670bb CH |
316 | /* |
317 | * 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 | ||
1da177e4 LT |
325 | /* |
326 | * 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); | |
f6c2d1fa | 337 | if (error) |
1da177e4 | 338 | goto abort_return; |
1da177e4 LT |
339 | } |
340 | ||
556b8b16 BN |
341 | error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino, |
342 | &first_block, &free_list, spaceres); | |
f6c2d1fa | 343 | if (error) |
1da177e4 | 344 | goto abort_return; |
1da177e4 | 345 | |
26c52951 | 346 | xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
1da177e4 | 347 | xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE); |
26c52951 | 348 | if (new_parent) |
1da177e4 | 349 | xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE); |
1da177e4 | 350 | |
1da177e4 LT |
351 | /* |
352 | * 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 | ||
f7c99b6f | 360 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
1da177e4 LT |
361 | if (error) { |
362 | xfs_bmap_cancel(&free_list); | |
363 | xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | | |
364 | XFS_TRANS_ABORT)); | |
1da177e4 LT |
365 | goto std_return; |
366 | } | |
367 | ||
368 | /* | |
369 | * trans_commit will unlock src_ip, target_ip & decrement | |
370 | * the vnode references. | |
371 | */ | |
1c72bf90 | 372 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
1da177e4 LT |
373 | |
374 | /* Fall through to std_return with error = 0 or errno from | |
375 | * xfs_trans_commit */ | |
376 | std_return: | |
eb9df39d CH |
377 | if (DM_EVENT_ENABLED(src_dp, DM_EVENT_POSTRENAME) || |
378 | DM_EVENT_ENABLED(target_dp, DM_EVENT_POSTRENAME)) { | |
1da177e4 | 379 | (void) XFS_SEND_NAMESP (mp, DM_EVENT_POSTRENAME, |
bc4ac74a CH |
380 | src_dp, DM_RIGHT_NULL, |
381 | target_dp, DM_RIGHT_NULL, | |
556b8b16 | 382 | src_name->name, target_name->name, |
1da177e4 LT |
383 | 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; | |
1da177e4 | 394 | } |