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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) { | |
4d8d9293 | 73 | inode = nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino); |
d2500652 RK |
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 | ||
4d8d9293 RK |
90 | inode = nilfs_iget(child->d_inode->i_sb, |
91 | NILFS_I(child->d_inode)->i_root, ino); | |
d2500652 RK |
92 | if (IS_ERR(inode)) |
93 | return ERR_CAST(inode); | |
94 | return d_obtain_alias(inode); | |
95 | } | |
96 | ||
97 | /* | |
98 | * By the time this is called, we already have created | |
99 | * the directory cache entry for the new file, but it | |
100 | * is so far negative - it has no inode. | |
101 | * | |
102 | * If the create succeeds, we fill in the inode information | |
103 | * with d_instantiate(). | |
104 | */ | |
105 | static int nilfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
106 | struct nameidata *nd) | |
107 | { | |
108 | struct inode *inode; | |
109 | struct nilfs_transaction_info ti; | |
47420c79 | 110 | int err; |
d2500652 RK |
111 | |
112 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
113 | if (err) | |
114 | return err; | |
115 | inode = nilfs_new_inode(dir, mode); | |
116 | err = PTR_ERR(inode); | |
117 | if (!IS_ERR(inode)) { | |
118 | inode->i_op = &nilfs_file_inode_operations; | |
119 | inode->i_fop = &nilfs_file_operations; | |
120 | inode->i_mapping->a_ops = &nilfs_aops; | |
abdb318b | 121 | nilfs_mark_inode_dirty(inode); |
d2500652 RK |
122 | err = nilfs_add_nondir(dentry, inode); |
123 | } | |
47420c79 RK |
124 | if (!err) |
125 | err = nilfs_transaction_commit(dir->i_sb); | |
126 | else | |
127 | nilfs_transaction_abort(dir->i_sb); | |
128 | ||
129 | return err; | |
d2500652 RK |
130 | } |
131 | ||
132 | static int | |
133 | nilfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
134 | { | |
135 | struct inode *inode; | |
136 | struct nilfs_transaction_info ti; | |
47420c79 | 137 | int err; |
d2500652 RK |
138 | |
139 | if (!new_valid_dev(rdev)) | |
140 | return -EINVAL; | |
141 | ||
142 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
143 | if (err) | |
144 | return err; | |
145 | inode = nilfs_new_inode(dir, mode); | |
146 | err = PTR_ERR(inode); | |
147 | if (!IS_ERR(inode)) { | |
148 | init_special_inode(inode, inode->i_mode, rdev); | |
abdb318b | 149 | nilfs_mark_inode_dirty(inode); |
d2500652 RK |
150 | err = nilfs_add_nondir(dentry, inode); |
151 | } | |
47420c79 RK |
152 | if (!err) |
153 | err = nilfs_transaction_commit(dir->i_sb); | |
154 | else | |
155 | nilfs_transaction_abort(dir->i_sb); | |
156 | ||
157 | return err; | |
d2500652 RK |
158 | } |
159 | ||
160 | static int nilfs_symlink(struct inode *dir, struct dentry *dentry, | |
161 | const char *symname) | |
162 | { | |
163 | struct nilfs_transaction_info ti; | |
164 | struct super_block *sb = dir->i_sb; | |
165 | unsigned l = strlen(symname)+1; | |
166 | struct inode *inode; | |
47420c79 | 167 | int err; |
d2500652 RK |
168 | |
169 | if (l > sb->s_blocksize) | |
170 | return -ENAMETOOLONG; | |
171 | ||
172 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
173 | if (err) | |
174 | return err; | |
175 | ||
176 | inode = nilfs_new_inode(dir, S_IFLNK | S_IRWXUGO); | |
177 | err = PTR_ERR(inode); | |
178 | if (IS_ERR(inode)) | |
179 | goto out; | |
180 | ||
181 | /* slow symlink */ | |
182 | inode->i_op = &nilfs_symlink_inode_operations; | |
183 | inode->i_mapping->a_ops = &nilfs_aops; | |
184 | err = page_symlink(inode, symname, l); | |
185 | if (err) | |
186 | goto out_fail; | |
187 | ||
188 | /* mark_inode_dirty(inode); */ | |
9ca941d4 | 189 | /* page_symlink() do this */ |
d2500652 RK |
190 | |
191 | err = nilfs_add_nondir(dentry, inode); | |
192 | out: | |
47420c79 RK |
193 | if (!err) |
194 | err = nilfs_transaction_commit(dir->i_sb); | |
195 | else | |
196 | nilfs_transaction_abort(dir->i_sb); | |
197 | ||
198 | return err; | |
d2500652 RK |
199 | |
200 | out_fail: | |
565de406 | 201 | drop_nlink(inode); |
abdb318b | 202 | nilfs_mark_inode_dirty(inode); |
d2500652 RK |
203 | iput(inode); |
204 | goto out; | |
205 | } | |
206 | ||
207 | static int nilfs_link(struct dentry *old_dentry, struct inode *dir, | |
208 | struct dentry *dentry) | |
209 | { | |
210 | struct inode *inode = old_dentry->d_inode; | |
211 | struct nilfs_transaction_info ti; | |
47420c79 | 212 | int err; |
d2500652 RK |
213 | |
214 | if (inode->i_nlink >= NILFS_LINK_MAX) | |
215 | return -EMLINK; | |
216 | ||
217 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
218 | if (err) | |
219 | return err; | |
220 | ||
221 | inode->i_ctime = CURRENT_TIME; | |
222 | inode_inc_link_count(inode); | |
223 | atomic_inc(&inode->i_count); | |
224 | ||
225 | err = nilfs_add_nondir(dentry, inode); | |
47420c79 RK |
226 | if (!err) |
227 | err = nilfs_transaction_commit(dir->i_sb); | |
228 | else | |
229 | nilfs_transaction_abort(dir->i_sb); | |
230 | ||
231 | return err; | |
d2500652 RK |
232 | } |
233 | ||
234 | static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
235 | { | |
236 | struct inode *inode; | |
237 | struct nilfs_transaction_info ti; | |
47420c79 | 238 | int err; |
d2500652 RK |
239 | |
240 | if (dir->i_nlink >= NILFS_LINK_MAX) | |
241 | return -EMLINK; | |
242 | ||
243 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
244 | if (err) | |
245 | return err; | |
246 | ||
565de406 | 247 | inc_nlink(dir); |
d2500652 RK |
248 | |
249 | inode = nilfs_new_inode(dir, S_IFDIR | mode); | |
250 | err = PTR_ERR(inode); | |
251 | if (IS_ERR(inode)) | |
252 | goto out_dir; | |
253 | ||
254 | inode->i_op = &nilfs_dir_inode_operations; | |
255 | inode->i_fop = &nilfs_dir_operations; | |
256 | inode->i_mapping->a_ops = &nilfs_aops; | |
257 | ||
565de406 | 258 | inc_nlink(inode); |
d2500652 RK |
259 | |
260 | err = nilfs_make_empty(inode, dir); | |
261 | if (err) | |
262 | goto out_fail; | |
263 | ||
264 | err = nilfs_add_link(dentry, inode); | |
265 | if (err) | |
266 | goto out_fail; | |
267 | ||
abdb318b | 268 | nilfs_mark_inode_dirty(inode); |
d2500652 RK |
269 | d_instantiate(dentry, inode); |
270 | out: | |
47420c79 RK |
271 | if (!err) |
272 | err = nilfs_transaction_commit(dir->i_sb); | |
273 | else | |
274 | nilfs_transaction_abort(dir->i_sb); | |
275 | ||
276 | return err; | |
d2500652 RK |
277 | |
278 | out_fail: | |
565de406 | 279 | drop_nlink(inode); |
565de406 | 280 | drop_nlink(inode); |
abdb318b | 281 | nilfs_mark_inode_dirty(inode); |
d2500652 RK |
282 | iput(inode); |
283 | out_dir: | |
565de406 | 284 | drop_nlink(dir); |
abdb318b | 285 | nilfs_mark_inode_dirty(dir); |
d2500652 RK |
286 | goto out; |
287 | } | |
288 | ||
4cd76c3c | 289 | static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry) |
d2500652 RK |
290 | { |
291 | struct inode *inode; | |
292 | struct nilfs_dir_entry *de; | |
293 | struct page *page; | |
47420c79 | 294 | int err; |
d2500652 | 295 | |
d2500652 | 296 | err = -ENOENT; |
0319003d | 297 | de = nilfs_find_entry(dir, &dentry->d_name, &page); |
d2500652 RK |
298 | if (!de) |
299 | goto out; | |
300 | ||
301 | inode = dentry->d_inode; | |
302 | err = -EIO; | |
303 | if (le64_to_cpu(de->inode) != inode->i_ino) | |
304 | goto out; | |
305 | ||
306 | if (!inode->i_nlink) { | |
307 | nilfs_warning(inode->i_sb, __func__, | |
308 | "deleting nonexistent file (%lu), %d\n", | |
309 | inode->i_ino, inode->i_nlink); | |
310 | inode->i_nlink = 1; | |
311 | } | |
312 | err = nilfs_delete_entry(de, page); | |
313 | if (err) | |
314 | goto out; | |
315 | ||
316 | inode->i_ctime = dir->i_ctime; | |
565de406 | 317 | drop_nlink(inode); |
d2500652 RK |
318 | err = 0; |
319 | out: | |
4cd76c3c JS |
320 | return err; |
321 | } | |
322 | ||
323 | static int nilfs_unlink(struct inode *dir, struct dentry *dentry) | |
324 | { | |
325 | struct nilfs_transaction_info ti; | |
326 | int err; | |
327 | ||
328 | err = nilfs_transaction_begin(dir->i_sb, &ti, 0); | |
329 | if (err) | |
330 | return err; | |
331 | ||
332 | err = nilfs_do_unlink(dir, dentry); | |
333 | ||
334 | if (!err) { | |
abdb318b JS |
335 | nilfs_mark_inode_dirty(dir); |
336 | nilfs_mark_inode_dirty(dentry->d_inode); | |
47420c79 | 337 | err = nilfs_transaction_commit(dir->i_sb); |
4cd76c3c | 338 | } else |
47420c79 RK |
339 | nilfs_transaction_abort(dir->i_sb); |
340 | ||
341 | return err; | |
d2500652 RK |
342 | } |
343 | ||
344 | static int nilfs_rmdir(struct inode *dir, struct dentry *dentry) | |
345 | { | |
346 | struct inode *inode = dentry->d_inode; | |
347 | struct nilfs_transaction_info ti; | |
47420c79 | 348 | int err; |
d2500652 RK |
349 | |
350 | err = nilfs_transaction_begin(dir->i_sb, &ti, 0); | |
351 | if (err) | |
352 | return err; | |
353 | ||
354 | err = -ENOTEMPTY; | |
355 | if (nilfs_empty_dir(inode)) { | |
4cd76c3c | 356 | err = nilfs_do_unlink(dir, dentry); |
d2500652 RK |
357 | if (!err) { |
358 | inode->i_size = 0; | |
565de406 | 359 | drop_nlink(inode); |
abdb318b | 360 | nilfs_mark_inode_dirty(inode); |
565de406 | 361 | drop_nlink(dir); |
abdb318b | 362 | nilfs_mark_inode_dirty(dir); |
d2500652 RK |
363 | } |
364 | } | |
47420c79 RK |
365 | if (!err) |
366 | err = nilfs_transaction_commit(dir->i_sb); | |
367 | else | |
368 | nilfs_transaction_abort(dir->i_sb); | |
369 | ||
370 | return err; | |
d2500652 RK |
371 | } |
372 | ||
373 | static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
374 | struct inode *new_dir, struct dentry *new_dentry) | |
375 | { | |
376 | struct inode *old_inode = old_dentry->d_inode; | |
377 | struct inode *new_inode = new_dentry->d_inode; | |
378 | struct page *dir_page = NULL; | |
379 | struct nilfs_dir_entry *dir_de = NULL; | |
380 | struct page *old_page; | |
381 | struct nilfs_dir_entry *old_de; | |
382 | struct nilfs_transaction_info ti; | |
383 | int err; | |
384 | ||
385 | err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1); | |
386 | if (unlikely(err)) | |
387 | return err; | |
388 | ||
389 | err = -ENOENT; | |
0319003d | 390 | old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
d2500652 RK |
391 | if (!old_de) |
392 | goto out; | |
393 | ||
394 | if (S_ISDIR(old_inode->i_mode)) { | |
395 | err = -EIO; | |
396 | dir_de = nilfs_dotdot(old_inode, &dir_page); | |
397 | if (!dir_de) | |
398 | goto out_old; | |
399 | } | |
400 | ||
401 | if (new_inode) { | |
402 | struct page *new_page; | |
403 | struct nilfs_dir_entry *new_de; | |
404 | ||
405 | err = -ENOTEMPTY; | |
406 | if (dir_de && !nilfs_empty_dir(new_inode)) | |
407 | goto out_dir; | |
408 | ||
409 | err = -ENOENT; | |
0319003d | 410 | new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page); |
d2500652 RK |
411 | if (!new_de) |
412 | goto out_dir; | |
565de406 | 413 | inc_nlink(old_inode); |
d2500652 | 414 | nilfs_set_link(new_dir, new_de, new_page, old_inode); |
abdb318b | 415 | nilfs_mark_inode_dirty(new_dir); |
d2500652 RK |
416 | new_inode->i_ctime = CURRENT_TIME; |
417 | if (dir_de) | |
418 | drop_nlink(new_inode); | |
565de406 | 419 | drop_nlink(new_inode); |
abdb318b | 420 | nilfs_mark_inode_dirty(new_inode); |
d2500652 RK |
421 | } else { |
422 | if (dir_de) { | |
423 | err = -EMLINK; | |
424 | if (new_dir->i_nlink >= NILFS_LINK_MAX) | |
425 | goto out_dir; | |
426 | } | |
565de406 | 427 | inc_nlink(old_inode); |
d2500652 RK |
428 | err = nilfs_add_link(new_dentry, old_inode); |
429 | if (err) { | |
565de406 | 430 | drop_nlink(old_inode); |
abdb318b | 431 | nilfs_mark_inode_dirty(old_inode); |
d2500652 RK |
432 | goto out_dir; |
433 | } | |
565de406 JS |
434 | if (dir_de) { |
435 | inc_nlink(new_dir); | |
abdb318b | 436 | nilfs_mark_inode_dirty(new_dir); |
565de406 | 437 | } |
d2500652 RK |
438 | } |
439 | ||
440 | /* | |
441 | * Like most other Unix systems, set the ctime for inodes on a | |
442 | * rename. | |
d2500652 RK |
443 | */ |
444 | old_inode->i_ctime = CURRENT_TIME; | |
445 | ||
446 | nilfs_delete_entry(old_de, old_page); | |
43f8bc26 | 447 | drop_nlink(old_inode); |
d2500652 RK |
448 | |
449 | if (dir_de) { | |
450 | nilfs_set_link(old_inode, dir_de, dir_page, new_dir); | |
565de406 | 451 | drop_nlink(old_dir); |
d2500652 | 452 | } |
abdb318b JS |
453 | nilfs_mark_inode_dirty(old_dir); |
454 | nilfs_mark_inode_dirty(old_inode); | |
d2500652 | 455 | |
47420c79 | 456 | err = nilfs_transaction_commit(old_dir->i_sb); |
d2500652 RK |
457 | return err; |
458 | ||
459 | out_dir: | |
460 | if (dir_de) { | |
461 | kunmap(dir_page); | |
462 | page_cache_release(dir_page); | |
463 | } | |
464 | out_old: | |
465 | kunmap(old_page); | |
466 | page_cache_release(old_page); | |
467 | out: | |
47420c79 | 468 | nilfs_transaction_abort(old_dir->i_sb); |
d2500652 RK |
469 | return err; |
470 | } | |
471 | ||
6e1d5dcc | 472 | const struct inode_operations nilfs_dir_inode_operations = { |
d2500652 RK |
473 | .create = nilfs_create, |
474 | .lookup = nilfs_lookup, | |
475 | .link = nilfs_link, | |
476 | .unlink = nilfs_unlink, | |
477 | .symlink = nilfs_symlink, | |
478 | .mkdir = nilfs_mkdir, | |
479 | .rmdir = nilfs_rmdir, | |
480 | .mknod = nilfs_mknod, | |
481 | .rename = nilfs_rename, | |
482 | .setattr = nilfs_setattr, | |
483 | .permission = nilfs_permission, | |
484 | }; | |
485 | ||
6e1d5dcc | 486 | const struct inode_operations nilfs_special_inode_operations = { |
d2500652 RK |
487 | .setattr = nilfs_setattr, |
488 | .permission = nilfs_permission, | |
489 | }; | |
490 | ||
6e1d5dcc | 491 | const struct inode_operations nilfs_symlink_inode_operations = { |
d2500652 RK |
492 | .readlink = generic_readlink, |
493 | .follow_link = page_follow_link_light, | |
494 | .put_link = page_put_link, | |
495 | }; |