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1 | /* |
2 | * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. |
4 | * |
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 |
7 | * published by the Free Software Foundation. |
8 | * |
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. |
13 | * |
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 |
17 | */ |
18 | #include "xfs.h" |
19 | #include "xfs_fs.h" |
20 | #include "xfs_types.h" |
21 | #include "xfs_log.h" |
22 | #include "xfs_inum.h" |
23 | #include "xfs_trans.h" |
24 | #include "xfs_sb.h" |
25 | #include "xfs_ag.h" |
26 | #include "xfs_dir2.h" |
27 | #include "xfs_mount.h" |
28 | #include "xfs_da_btree.h" |
29 | #include "xfs_bmap_btree.h" |
30 | #include "xfs_dinode.h" |
31 | #include "xfs_inode.h" |
32 | #include "xfs_inode_item.h" |
33 | #include "xfs_bmap.h" |
34 | #include "xfs_error.h" |
35 | #include "xfs_quota.h" |
36 | #include "xfs_utils.h" |
37 | #include "xfs_trans_space.h" |
38 | #include "xfs_vnodeops.h" |
39 | #include "xfs_trace.h" |
40 | |
41 | |
42 | /* |
43 | * Enter all inodes for a rename transaction into a sorted array. |
44 | */ |
45 | STATIC void |
46 | xfs_sort_for_rename( |
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 */ |
50 | xfs_inode_t *ip2, /* in: inode of new entry, if it |
51 | already exists, NULL otherwise. */ |
52 | xfs_inode_t **i_tab,/* out: array of inode returned, sorted */ |
53 | int *num_inodes) /* out: number of inodes in array */ |
54 | { |
55 | xfs_inode_t *temp; |
56 | int i, j; |
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; |
68 | if (ip2) { |
69 | *num_inodes = 4; |
70 | i_tab[3] = ip2; |
71 | } else { |
72 | *num_inodes = 3; |
73 | i_tab[3] = NULL; |
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 | */ |
80 | for (i = 0; i < *num_inodes; i++) { |
81 | for (j = 1; j < *num_inodes; j++) { |
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 | } |
89 | } |
90 | |
91 | /* |
92 | * xfs_rename |
93 | */ |
94 | int |
95 | xfs_rename( |
96 | xfs_inode_t *src_dp, |
97 | struct xfs_name *src_name, |
98 | xfs_inode_t *src_ip, |
99 | xfs_inode_t *target_dp, |
100 | struct xfs_name *target_name, |
101 | xfs_inode_t *target_ip) |
102 | { |
103 | xfs_trans_t *tp = NULL; |
104 | xfs_mount_t *mp = src_dp->i_mount; |
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]; |
113 | int spaceres; |
114 | int num_inodes; |
115 | |
116 | trace_xfs_rename(src_dp, target_dp, src_name, target_name); |
117 | |
118 | new_parent = (src_dp != target_dp); |
119 | src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR); |
120 | |
121 | 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 | |
135 | xfs_bmap_init(&free_list, &first_block); |
136 | tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME); |
137 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; |
138 | spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len); |
139 | 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) { |
147 | xfs_trans_cancel(tp, 0); |
148 | goto std_return; |
149 | } |
150 | |
151 | /* |
152 | * Attach the dquots to the inodes |
153 | */ |
154 | error = xfs_qm_vop_rename_dqattach(inodes); |
155 | if (error) { |
156 | xfs_trans_cancel(tp, cancel_flags); |
157 | goto std_return; |
158 | } |
159 | |
160 | /* |
161 | * 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. |
165 | */ |
166 | xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL); |
167 | |
168 | /* |
169 | * Join all the inodes to the transaction. From this point on, |
170 | * we can rely on either trans_commit or trans_cancel to unlock |
171 | * them. |
172 | */ |
173 | xfs_trans_ijoin_ref(tp, src_dp, XFS_ILOCK_EXCL); |
174 | if (new_parent) |
175 | xfs_trans_ijoin_ref(tp, target_dp, XFS_ILOCK_EXCL); |
176 | xfs_trans_ijoin_ref(tp, src_ip, XFS_ILOCK_EXCL); |
177 | if (target_ip) |
178 | xfs_trans_ijoin_ref(tp, target_ip, XFS_ILOCK_EXCL); |
179 | |
180 | /* |
181 | * 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) && |
186 | (xfs_get_projid(target_dp) != xfs_get_projid(src_ip)))) { |
187 | error = XFS_ERROR(EXDEV); |
188 | goto error_return; |
189 | } |
190 | |
191 | /* |
192 | * 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 | */ |
199 | error = xfs_dir_canenter(tp, target_dp, target_name, spaceres); |
200 | if (error) |
201 | goto error_return; |
202 | /* |
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 | */ |
207 | error = xfs_dir_createname(tp, target_dp, target_name, |
208 | src_ip->i_ino, &first_block, |
209 | &free_list, spaceres); |
210 | if (error == ENOSPC) |
211 | goto error_return; |
212 | if (error) |
213 | goto abort_return; |
214 | |
215 | xfs_trans_ichgtime(tp, target_dp, |
216 | XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
217 | |
218 | if (new_parent && src_is_directory) { |
219 | error = xfs_bumplink(tp, target_dp); |
220 | if (error) |
221 | goto abort_return; |
222 | } |
223 | } else { /* target_ip != NULL */ |
224 | /* |
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 | */ |
229 | if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) { |
230 | /* |
231 | * Make sure target dir is empty. |
232 | */ |
233 | if (!(xfs_dir_isempty(target_ip)) || |
234 | (target_ip->i_d.di_nlink > 2)) { |
235 | error = XFS_ERROR(EEXIST); |
236 | 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 | */ |
249 | error = xfs_dir_replace(tp, target_dp, target_name, |
250 | src_ip->i_ino, |
251 | &first_block, &free_list, spaceres); |
252 | if (error) |
253 | goto abort_return; |
254 | |
255 | xfs_trans_ichgtime(tp, target_dp, |
256 | XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
257 | |
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); |
263 | if (error) |
264 | goto abort_return; |
265 | |
266 | if (src_is_directory) { |
267 | /* |
268 | * Drop the link from the old "." entry. |
269 | */ |
270 | error = xfs_droplink(tp, target_ip); |
271 | if (error) |
272 | goto abort_return; |
273 | } |
274 | } /* target_ip != NULL */ |
275 | |
276 | /* |
277 | * Remove the source. |
278 | */ |
279 | if (new_parent && src_is_directory) { |
280 | /* |
281 | * Rewrite the ".." entry to point to the new |
282 | * directory. |
283 | */ |
284 | error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot, |
285 | target_dp->i_ino, |
286 | &first_block, &free_list, spaceres); |
287 | ASSERT(error != EEXIST); |
288 | if (error) |
289 | goto abort_return; |
290 | } |
291 | |
292 | /* |
293 | * 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 | */ |
299 | xfs_trans_ichgtime(tp, src_ip, XFS_ICHGTIME_CHG); |
300 | xfs_trans_log_inode(tp, src_ip, XFS_ILOG_CORE); |
301 | |
302 | /* |
303 | * 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); |
314 | if (error) |
315 | goto abort_return; |
316 | } |
317 | |
318 | error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino, |
319 | &first_block, &free_list, spaceres); |
320 | if (error) |
321 | goto abort_return; |
322 | |
323 | xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
324 | xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE); |
325 | if (new_parent) |
326 | xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE); |
327 | |
328 | /* |
329 | * 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 | |
337 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
338 | if (error) { |
339 | xfs_bmap_cancel(&free_list); |
340 | xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | |
341 | XFS_TRANS_ABORT)); |
342 | goto std_return; |
343 | } |
344 | |
345 | /* |
346 | * trans_commit will unlock src_ip, target_ip & decrement |
347 | * the vnode references. |
348 | */ |
349 | return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
350 | |
351 | abort_return: |
352 | cancel_flags |= XFS_TRANS_ABORT; |
353 | error_return: |
354 | xfs_bmap_cancel(&free_list); |
355 | xfs_trans_cancel(tp, cancel_flags); |
356 | std_return: |
357 | return error; |
358 | } |
359 |
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