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d2500652 RK |
1 | /* |
2 | * namei.c - NILFS pathname lookup operations. | |
3 | * | |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Modified for NILFS by Amagai Yoshiji <amagai@osrg.net>, | |
21 | * Ryusuke Konishi <ryusuke@osrg.net> | |
22 | */ | |
23 | /* | |
24 | * linux/fs/ext2/namei.c | |
25 | * | |
26 | * Copyright (C) 1992, 1993, 1994, 1995 | |
27 | * Remy Card (card@masi.ibp.fr) | |
28 | * Laboratoire MASI - Institut Blaise Pascal | |
29 | * Universite Pierre et Marie Curie (Paris VI) | |
30 | * | |
31 | * from | |
32 | * | |
33 | * linux/fs/minix/namei.c | |
34 | * | |
35 | * Copyright (C) 1991, 1992 Linus Torvalds | |
36 | * | |
37 | * Big-endian to little-endian byte-swapping/bitmaps by | |
38 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
39 | */ | |
40 | ||
41 | #include <linux/pagemap.h> | |
42 | #include "nilfs.h" | |
43 | ||
44 | ||
45 | static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode) | |
46 | { | |
47 | int err = nilfs_add_link(dentry, inode); | |
48 | if (!err) { | |
49 | d_instantiate(dentry, inode); | |
50 | return 0; | |
51 | } | |
52 | inode_dec_link_count(inode); | |
53 | iput(inode); | |
54 | return err; | |
55 | } | |
56 | ||
57 | /* | |
58 | * Methods themselves. | |
59 | */ | |
60 | ||
61 | static struct dentry * | |
62 | nilfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
63 | { | |
64 | struct inode *inode; | |
65 | ino_t ino; | |
66 | ||
67 | if (dentry->d_name.len > NILFS_NAME_LEN) | |
68 | return ERR_PTR(-ENAMETOOLONG); | |
69 | ||
0319003d | 70 | ino = nilfs_inode_by_name(dir, &dentry->d_name); |
d2500652 RK |
71 | inode = NULL; |
72 | if (ino) { | |
73 | inode = nilfs_iget(dir->i_sb, ino); | |
74 | if (IS_ERR(inode)) | |
75 | return ERR_CAST(inode); | |
76 | } | |
77 | return d_splice_alias(inode, dentry); | |
78 | } | |
79 | ||
80 | struct dentry *nilfs_get_parent(struct dentry *child) | |
81 | { | |
82 | unsigned long ino; | |
83 | struct inode *inode; | |
0319003d | 84 | struct qstr dotdot = {.name = "..", .len = 2}; |
d2500652 RK |
85 | |
86 | ino = nilfs_inode_by_name(child->d_inode, &dotdot); | |
87 | if (!ino) | |
88 | return ERR_PTR(-ENOENT); | |
89 | ||
90 | inode = nilfs_iget(child->d_inode->i_sb, ino); | |
91 | if (IS_ERR(inode)) | |
92 | return ERR_CAST(inode); | |
93 | return d_obtain_alias(inode); | |
94 | } | |
95 | ||
96 | /* | |
97 | * By the time this is called, we already have created | |
98 | * the directory cache entry for the new file, but it | |
99 | * is so far negative - it has no inode. | |
100 | * | |
101 | * If the create succeeds, we fill in the inode information | |
102 | * with d_instantiate(). | |
103 | */ | |
104 | static int nilfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
105 | struct nameidata *nd) | |
106 | { | |
107 | struct inode *inode; | |
108 | struct nilfs_transaction_info ti; | |
47420c79 | 109 | int err; |
d2500652 RK |
110 | |
111 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
112 | if (err) | |
113 | return err; | |
114 | inode = nilfs_new_inode(dir, mode); | |
115 | err = PTR_ERR(inode); | |
116 | if (!IS_ERR(inode)) { | |
117 | inode->i_op = &nilfs_file_inode_operations; | |
118 | inode->i_fop = &nilfs_file_operations; | |
119 | inode->i_mapping->a_ops = &nilfs_aops; | |
abdb318b | 120 | nilfs_mark_inode_dirty(inode); |
d2500652 RK |
121 | err = nilfs_add_nondir(dentry, inode); |
122 | } | |
47420c79 RK |
123 | if (!err) |
124 | err = nilfs_transaction_commit(dir->i_sb); | |
125 | else | |
126 | nilfs_transaction_abort(dir->i_sb); | |
127 | ||
128 | return err; | |
d2500652 RK |
129 | } |
130 | ||
131 | static int | |
132 | nilfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
133 | { | |
134 | struct inode *inode; | |
135 | struct nilfs_transaction_info ti; | |
47420c79 | 136 | int err; |
d2500652 RK |
137 | |
138 | if (!new_valid_dev(rdev)) | |
139 | return -EINVAL; | |
140 | ||
141 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
142 | if (err) | |
143 | return err; | |
144 | inode = nilfs_new_inode(dir, mode); | |
145 | err = PTR_ERR(inode); | |
146 | if (!IS_ERR(inode)) { | |
147 | init_special_inode(inode, inode->i_mode, rdev); | |
abdb318b | 148 | nilfs_mark_inode_dirty(inode); |
d2500652 RK |
149 | err = nilfs_add_nondir(dentry, inode); |
150 | } | |
47420c79 RK |
151 | if (!err) |
152 | err = nilfs_transaction_commit(dir->i_sb); | |
153 | else | |
154 | nilfs_transaction_abort(dir->i_sb); | |
155 | ||
156 | return err; | |
d2500652 RK |
157 | } |
158 | ||
159 | static int nilfs_symlink(struct inode *dir, struct dentry *dentry, | |
160 | const char *symname) | |
161 | { | |
162 | struct nilfs_transaction_info ti; | |
163 | struct super_block *sb = dir->i_sb; | |
164 | unsigned l = strlen(symname)+1; | |
165 | struct inode *inode; | |
47420c79 | 166 | int err; |
d2500652 RK |
167 | |
168 | if (l > sb->s_blocksize) | |
169 | return -ENAMETOOLONG; | |
170 | ||
171 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
172 | if (err) | |
173 | return err; | |
174 | ||
175 | inode = nilfs_new_inode(dir, S_IFLNK | S_IRWXUGO); | |
176 | err = PTR_ERR(inode); | |
177 | if (IS_ERR(inode)) | |
178 | goto out; | |
179 | ||
180 | /* slow symlink */ | |
181 | inode->i_op = &nilfs_symlink_inode_operations; | |
182 | inode->i_mapping->a_ops = &nilfs_aops; | |
183 | err = page_symlink(inode, symname, l); | |
184 | if (err) | |
185 | goto out_fail; | |
186 | ||
187 | /* mark_inode_dirty(inode); */ | |
9ca941d4 | 188 | /* page_symlink() do this */ |
d2500652 RK |
189 | |
190 | err = nilfs_add_nondir(dentry, inode); | |
191 | out: | |
47420c79 RK |
192 | if (!err) |
193 | err = nilfs_transaction_commit(dir->i_sb); | |
194 | else | |
195 | nilfs_transaction_abort(dir->i_sb); | |
196 | ||
197 | return err; | |
d2500652 RK |
198 | |
199 | out_fail: | |
565de406 | 200 | drop_nlink(inode); |
abdb318b | 201 | nilfs_mark_inode_dirty(inode); |
d2500652 RK |
202 | iput(inode); |
203 | goto out; | |
204 | } | |
205 | ||
206 | static int nilfs_link(struct dentry *old_dentry, struct inode *dir, | |
207 | struct dentry *dentry) | |
208 | { | |
209 | struct inode *inode = old_dentry->d_inode; | |
210 | struct nilfs_transaction_info ti; | |
47420c79 | 211 | int err; |
d2500652 RK |
212 | |
213 | if (inode->i_nlink >= NILFS_LINK_MAX) | |
214 | return -EMLINK; | |
215 | ||
216 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
217 | if (err) | |
218 | return err; | |
219 | ||
220 | inode->i_ctime = CURRENT_TIME; | |
221 | inode_inc_link_count(inode); | |
222 | atomic_inc(&inode->i_count); | |
223 | ||
224 | err = nilfs_add_nondir(dentry, inode); | |
47420c79 RK |
225 | if (!err) |
226 | err = nilfs_transaction_commit(dir->i_sb); | |
227 | else | |
228 | nilfs_transaction_abort(dir->i_sb); | |
229 | ||
230 | return err; | |
d2500652 RK |
231 | } |
232 | ||
233 | static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
234 | { | |
235 | struct inode *inode; | |
236 | struct nilfs_transaction_info ti; | |
47420c79 | 237 | int err; |
d2500652 RK |
238 | |
239 | if (dir->i_nlink >= NILFS_LINK_MAX) | |
240 | return -EMLINK; | |
241 | ||
242 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
243 | if (err) | |
244 | return err; | |
245 | ||
565de406 | 246 | inc_nlink(dir); |
d2500652 RK |
247 | |
248 | inode = nilfs_new_inode(dir, S_IFDIR | mode); | |
249 | err = PTR_ERR(inode); | |
250 | if (IS_ERR(inode)) | |
251 | goto out_dir; | |
252 | ||
253 | inode->i_op = &nilfs_dir_inode_operations; | |
254 | inode->i_fop = &nilfs_dir_operations; | |
255 | inode->i_mapping->a_ops = &nilfs_aops; | |
256 | ||
565de406 | 257 | inc_nlink(inode); |
d2500652 RK |
258 | |
259 | err = nilfs_make_empty(inode, dir); | |
260 | if (err) | |
261 | goto out_fail; | |
262 | ||
263 | err = nilfs_add_link(dentry, inode); | |
264 | if (err) | |
265 | goto out_fail; | |
266 | ||
abdb318b | 267 | nilfs_mark_inode_dirty(inode); |
d2500652 RK |
268 | d_instantiate(dentry, inode); |
269 | out: | |
47420c79 RK |
270 | if (!err) |
271 | err = nilfs_transaction_commit(dir->i_sb); | |
272 | else | |
273 | nilfs_transaction_abort(dir->i_sb); | |
274 | ||
275 | return err; | |
d2500652 RK |
276 | |
277 | out_fail: | |
565de406 | 278 | drop_nlink(inode); |
565de406 | 279 | drop_nlink(inode); |
abdb318b | 280 | nilfs_mark_inode_dirty(inode); |
d2500652 RK |
281 | iput(inode); |
282 | out_dir: | |
565de406 | 283 | drop_nlink(dir); |
abdb318b | 284 | nilfs_mark_inode_dirty(dir); |
d2500652 RK |
285 | goto out; |
286 | } | |
287 | ||
4cd76c3c | 288 | static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry) |
d2500652 RK |
289 | { |
290 | struct inode *inode; | |
291 | struct nilfs_dir_entry *de; | |
292 | struct page *page; | |
47420c79 | 293 | int err; |
d2500652 | 294 | |
d2500652 | 295 | err = -ENOENT; |
0319003d | 296 | de = nilfs_find_entry(dir, &dentry->d_name, &page); |
d2500652 RK |
297 | if (!de) |
298 | goto out; | |
299 | ||
300 | inode = dentry->d_inode; | |
301 | err = -EIO; | |
302 | if (le64_to_cpu(de->inode) != inode->i_ino) | |
303 | goto out; | |
304 | ||
305 | if (!inode->i_nlink) { | |
306 | nilfs_warning(inode->i_sb, __func__, | |
307 | "deleting nonexistent file (%lu), %d\n", | |
308 | inode->i_ino, inode->i_nlink); | |
309 | inode->i_nlink = 1; | |
310 | } | |
311 | err = nilfs_delete_entry(de, page); | |
312 | if (err) | |
313 | goto out; | |
314 | ||
315 | inode->i_ctime = dir->i_ctime; | |
565de406 | 316 | drop_nlink(inode); |
d2500652 RK |
317 | err = 0; |
318 | out: | |
4cd76c3c JS |
319 | return err; |
320 | } | |
321 | ||
322 | static int nilfs_unlink(struct inode *dir, struct dentry *dentry) | |
323 | { | |
324 | struct nilfs_transaction_info ti; | |
325 | int err; | |
326 | ||
327 | err = nilfs_transaction_begin(dir->i_sb, &ti, 0); | |
328 | if (err) | |
329 | return err; | |
330 | ||
331 | err = nilfs_do_unlink(dir, dentry); | |
332 | ||
333 | if (!err) { | |
abdb318b JS |
334 | nilfs_mark_inode_dirty(dir); |
335 | nilfs_mark_inode_dirty(dentry->d_inode); | |
47420c79 | 336 | err = nilfs_transaction_commit(dir->i_sb); |
4cd76c3c | 337 | } else |
47420c79 RK |
338 | nilfs_transaction_abort(dir->i_sb); |
339 | ||
340 | return err; | |
d2500652 RK |
341 | } |
342 | ||
343 | static int nilfs_rmdir(struct inode *dir, struct dentry *dentry) | |
344 | { | |
345 | struct inode *inode = dentry->d_inode; | |
346 | struct nilfs_transaction_info ti; | |
47420c79 | 347 | int err; |
d2500652 RK |
348 | |
349 | err = nilfs_transaction_begin(dir->i_sb, &ti, 0); | |
350 | if (err) | |
351 | return err; | |
352 | ||
353 | err = -ENOTEMPTY; | |
354 | if (nilfs_empty_dir(inode)) { | |
4cd76c3c | 355 | err = nilfs_do_unlink(dir, dentry); |
d2500652 RK |
356 | if (!err) { |
357 | inode->i_size = 0; | |
565de406 | 358 | drop_nlink(inode); |
abdb318b | 359 | nilfs_mark_inode_dirty(inode); |
565de406 | 360 | drop_nlink(dir); |
abdb318b | 361 | nilfs_mark_inode_dirty(dir); |
d2500652 RK |
362 | } |
363 | } | |
47420c79 RK |
364 | if (!err) |
365 | err = nilfs_transaction_commit(dir->i_sb); | |
366 | else | |
367 | nilfs_transaction_abort(dir->i_sb); | |
368 | ||
369 | return err; | |
d2500652 RK |
370 | } |
371 | ||
372 | static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
373 | struct inode *new_dir, struct dentry *new_dentry) | |
374 | { | |
375 | struct inode *old_inode = old_dentry->d_inode; | |
376 | struct inode *new_inode = new_dentry->d_inode; | |
377 | struct page *dir_page = NULL; | |
378 | struct nilfs_dir_entry *dir_de = NULL; | |
379 | struct page *old_page; | |
380 | struct nilfs_dir_entry *old_de; | |
381 | struct nilfs_transaction_info ti; | |
382 | int err; | |
383 | ||
384 | err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1); | |
385 | if (unlikely(err)) | |
386 | return err; | |
387 | ||
388 | err = -ENOENT; | |
0319003d | 389 | old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
d2500652 RK |
390 | if (!old_de) |
391 | goto out; | |
392 | ||
393 | if (S_ISDIR(old_inode->i_mode)) { | |
394 | err = -EIO; | |
395 | dir_de = nilfs_dotdot(old_inode, &dir_page); | |
396 | if (!dir_de) | |
397 | goto out_old; | |
398 | } | |
399 | ||
400 | if (new_inode) { | |
401 | struct page *new_page; | |
402 | struct nilfs_dir_entry *new_de; | |
403 | ||
404 | err = -ENOTEMPTY; | |
405 | if (dir_de && !nilfs_empty_dir(new_inode)) | |
406 | goto out_dir; | |
407 | ||
408 | err = -ENOENT; | |
0319003d | 409 | new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page); |
d2500652 RK |
410 | if (!new_de) |
411 | goto out_dir; | |
565de406 | 412 | inc_nlink(old_inode); |
d2500652 | 413 | nilfs_set_link(new_dir, new_de, new_page, old_inode); |
abdb318b | 414 | nilfs_mark_inode_dirty(new_dir); |
d2500652 RK |
415 | new_inode->i_ctime = CURRENT_TIME; |
416 | if (dir_de) | |
417 | drop_nlink(new_inode); | |
565de406 | 418 | drop_nlink(new_inode); |
abdb318b | 419 | nilfs_mark_inode_dirty(new_inode); |
d2500652 RK |
420 | } else { |
421 | if (dir_de) { | |
422 | err = -EMLINK; | |
423 | if (new_dir->i_nlink >= NILFS_LINK_MAX) | |
424 | goto out_dir; | |
425 | } | |
565de406 | 426 | inc_nlink(old_inode); |
d2500652 RK |
427 | err = nilfs_add_link(new_dentry, old_inode); |
428 | if (err) { | |
565de406 | 429 | drop_nlink(old_inode); |
abdb318b | 430 | nilfs_mark_inode_dirty(old_inode); |
d2500652 RK |
431 | goto out_dir; |
432 | } | |
565de406 JS |
433 | if (dir_de) { |
434 | inc_nlink(new_dir); | |
abdb318b | 435 | nilfs_mark_inode_dirty(new_dir); |
565de406 | 436 | } |
d2500652 RK |
437 | } |
438 | ||
439 | /* | |
440 | * Like most other Unix systems, set the ctime for inodes on a | |
441 | * rename. | |
d2500652 RK |
442 | */ |
443 | old_inode->i_ctime = CURRENT_TIME; | |
444 | ||
445 | nilfs_delete_entry(old_de, old_page); | |
43f8bc26 | 446 | drop_nlink(old_inode); |
d2500652 RK |
447 | |
448 | if (dir_de) { | |
449 | nilfs_set_link(old_inode, dir_de, dir_page, new_dir); | |
565de406 | 450 | drop_nlink(old_dir); |
d2500652 | 451 | } |
abdb318b JS |
452 | nilfs_mark_inode_dirty(old_dir); |
453 | nilfs_mark_inode_dirty(old_inode); | |
d2500652 | 454 | |
47420c79 | 455 | err = nilfs_transaction_commit(old_dir->i_sb); |
d2500652 RK |
456 | return err; |
457 | ||
458 | out_dir: | |
459 | if (dir_de) { | |
460 | kunmap(dir_page); | |
461 | page_cache_release(dir_page); | |
462 | } | |
463 | out_old: | |
464 | kunmap(old_page); | |
465 | page_cache_release(old_page); | |
466 | out: | |
47420c79 | 467 | nilfs_transaction_abort(old_dir->i_sb); |
d2500652 RK |
468 | return err; |
469 | } | |
470 | ||
6e1d5dcc | 471 | const struct inode_operations nilfs_dir_inode_operations = { |
d2500652 RK |
472 | .create = nilfs_create, |
473 | .lookup = nilfs_lookup, | |
474 | .link = nilfs_link, | |
475 | .unlink = nilfs_unlink, | |
476 | .symlink = nilfs_symlink, | |
477 | .mkdir = nilfs_mkdir, | |
478 | .rmdir = nilfs_rmdir, | |
479 | .mknod = nilfs_mknod, | |
480 | .rename = nilfs_rename, | |
481 | .setattr = nilfs_setattr, | |
482 | .permission = nilfs_permission, | |
483 | }; | |
484 | ||
6e1d5dcc | 485 | const struct inode_operations nilfs_special_inode_operations = { |
d2500652 RK |
486 | .setattr = nilfs_setattr, |
487 | .permission = nilfs_permission, | |
488 | }; | |
489 | ||
6e1d5dcc | 490 | const struct inode_operations nilfs_symlink_inode_operations = { |
d2500652 RK |
491 | .readlink = generic_readlink, |
492 | .follow_link = page_follow_link_light, | |
493 | .put_link = page_put_link, | |
494 | }; |