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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 | ||
70 | ino = nilfs_inode_by_name(dir, dentry); | |
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; | |
84 | struct dentry dotdot; | |
85 | ||
86 | dotdot.d_name.name = ".."; | |
87 | dotdot.d_name.len = 2; | |
88 | ||
89 | ino = nilfs_inode_by_name(child->d_inode, &dotdot); | |
90 | if (!ino) | |
91 | return ERR_PTR(-ENOENT); | |
92 | ||
93 | inode = nilfs_iget(child->d_inode->i_sb, ino); | |
94 | if (IS_ERR(inode)) | |
95 | return ERR_CAST(inode); | |
96 | return d_obtain_alias(inode); | |
97 | } | |
98 | ||
99 | /* | |
100 | * By the time this is called, we already have created | |
101 | * the directory cache entry for the new file, but it | |
102 | * is so far negative - it has no inode. | |
103 | * | |
104 | * If the create succeeds, we fill in the inode information | |
105 | * with d_instantiate(). | |
106 | */ | |
107 | static int nilfs_create(struct inode *dir, struct dentry *dentry, int mode, | |
108 | struct nameidata *nd) | |
109 | { | |
110 | struct inode *inode; | |
111 | struct nilfs_transaction_info ti; | |
47420c79 | 112 | int err; |
d2500652 RK |
113 | |
114 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
115 | if (err) | |
116 | return err; | |
117 | inode = nilfs_new_inode(dir, mode); | |
118 | err = PTR_ERR(inode); | |
119 | if (!IS_ERR(inode)) { | |
120 | inode->i_op = &nilfs_file_inode_operations; | |
121 | inode->i_fop = &nilfs_file_operations; | |
122 | inode->i_mapping->a_ops = &nilfs_aops; | |
123 | mark_inode_dirty(inode); | |
124 | err = nilfs_add_nondir(dentry, inode); | |
125 | } | |
47420c79 RK |
126 | if (!err) |
127 | err = nilfs_transaction_commit(dir->i_sb); | |
128 | else | |
129 | nilfs_transaction_abort(dir->i_sb); | |
130 | ||
131 | return err; | |
d2500652 RK |
132 | } |
133 | ||
134 | static int | |
135 | nilfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) | |
136 | { | |
137 | struct inode *inode; | |
138 | struct nilfs_transaction_info ti; | |
47420c79 | 139 | int err; |
d2500652 RK |
140 | |
141 | if (!new_valid_dev(rdev)) | |
142 | return -EINVAL; | |
143 | ||
144 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
145 | if (err) | |
146 | return err; | |
147 | inode = nilfs_new_inode(dir, mode); | |
148 | err = PTR_ERR(inode); | |
149 | if (!IS_ERR(inode)) { | |
150 | init_special_inode(inode, inode->i_mode, rdev); | |
151 | mark_inode_dirty(inode); | |
152 | err = nilfs_add_nondir(dentry, inode); | |
153 | } | |
47420c79 RK |
154 | if (!err) |
155 | err = nilfs_transaction_commit(dir->i_sb); | |
156 | else | |
157 | nilfs_transaction_abort(dir->i_sb); | |
158 | ||
159 | return err; | |
d2500652 RK |
160 | } |
161 | ||
162 | static int nilfs_symlink(struct inode *dir, struct dentry *dentry, | |
163 | const char *symname) | |
164 | { | |
165 | struct nilfs_transaction_info ti; | |
166 | struct super_block *sb = dir->i_sb; | |
167 | unsigned l = strlen(symname)+1; | |
168 | struct inode *inode; | |
47420c79 | 169 | int err; |
d2500652 RK |
170 | |
171 | if (l > sb->s_blocksize) | |
172 | return -ENAMETOOLONG; | |
173 | ||
174 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
175 | if (err) | |
176 | return err; | |
177 | ||
178 | inode = nilfs_new_inode(dir, S_IFLNK | S_IRWXUGO); | |
179 | err = PTR_ERR(inode); | |
180 | if (IS_ERR(inode)) | |
181 | goto out; | |
182 | ||
183 | /* slow symlink */ | |
184 | inode->i_op = &nilfs_symlink_inode_operations; | |
185 | inode->i_mapping->a_ops = &nilfs_aops; | |
186 | err = page_symlink(inode, symname, l); | |
187 | if (err) | |
188 | goto out_fail; | |
189 | ||
190 | /* mark_inode_dirty(inode); */ | |
9ca941d4 | 191 | /* page_symlink() do this */ |
d2500652 RK |
192 | |
193 | err = nilfs_add_nondir(dentry, inode); | |
194 | out: | |
47420c79 RK |
195 | if (!err) |
196 | err = nilfs_transaction_commit(dir->i_sb); | |
197 | else | |
198 | nilfs_transaction_abort(dir->i_sb); | |
199 | ||
200 | return err; | |
d2500652 RK |
201 | |
202 | out_fail: | |
565de406 JS |
203 | drop_nlink(inode); |
204 | mark_inode_dirty(inode); | |
d2500652 RK |
205 | iput(inode); |
206 | goto out; | |
207 | } | |
208 | ||
209 | static int nilfs_link(struct dentry *old_dentry, struct inode *dir, | |
210 | struct dentry *dentry) | |
211 | { | |
212 | struct inode *inode = old_dentry->d_inode; | |
213 | struct nilfs_transaction_info ti; | |
47420c79 | 214 | int err; |
d2500652 RK |
215 | |
216 | if (inode->i_nlink >= NILFS_LINK_MAX) | |
217 | return -EMLINK; | |
218 | ||
219 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
220 | if (err) | |
221 | return err; | |
222 | ||
223 | inode->i_ctime = CURRENT_TIME; | |
224 | inode_inc_link_count(inode); | |
225 | atomic_inc(&inode->i_count); | |
226 | ||
227 | err = nilfs_add_nondir(dentry, inode); | |
47420c79 RK |
228 | if (!err) |
229 | err = nilfs_transaction_commit(dir->i_sb); | |
230 | else | |
231 | nilfs_transaction_abort(dir->i_sb); | |
232 | ||
233 | return err; | |
d2500652 RK |
234 | } |
235 | ||
236 | static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
237 | { | |
238 | struct inode *inode; | |
239 | struct nilfs_transaction_info ti; | |
47420c79 | 240 | int err; |
d2500652 RK |
241 | |
242 | if (dir->i_nlink >= NILFS_LINK_MAX) | |
243 | return -EMLINK; | |
244 | ||
245 | err = nilfs_transaction_begin(dir->i_sb, &ti, 1); | |
246 | if (err) | |
247 | return err; | |
248 | ||
565de406 | 249 | inc_nlink(dir); |
d2500652 RK |
250 | |
251 | inode = nilfs_new_inode(dir, S_IFDIR | mode); | |
252 | err = PTR_ERR(inode); | |
253 | if (IS_ERR(inode)) | |
254 | goto out_dir; | |
255 | ||
256 | inode->i_op = &nilfs_dir_inode_operations; | |
257 | inode->i_fop = &nilfs_dir_operations; | |
258 | inode->i_mapping->a_ops = &nilfs_aops; | |
259 | ||
565de406 JS |
260 | inc_nlink(inode); |
261 | mark_inode_dirty(inode); | |
d2500652 RK |
262 | |
263 | err = nilfs_make_empty(inode, dir); | |
264 | if (err) | |
265 | goto out_fail; | |
266 | ||
267 | err = nilfs_add_link(dentry, inode); | |
268 | if (err) | |
269 | goto out_fail; | |
270 | ||
271 | d_instantiate(dentry, inode); | |
272 | out: | |
47420c79 RK |
273 | if (!err) |
274 | err = nilfs_transaction_commit(dir->i_sb); | |
275 | else | |
276 | nilfs_transaction_abort(dir->i_sb); | |
277 | ||
278 | return err; | |
d2500652 RK |
279 | |
280 | out_fail: | |
565de406 | 281 | drop_nlink(inode); |
565de406 JS |
282 | drop_nlink(inode); |
283 | mark_inode_dirty(inode); | |
d2500652 RK |
284 | iput(inode); |
285 | out_dir: | |
565de406 JS |
286 | drop_nlink(dir); |
287 | mark_inode_dirty(dir); | |
d2500652 RK |
288 | goto out; |
289 | } | |
290 | ||
291 | static int nilfs_unlink(struct inode *dir, struct dentry *dentry) | |
292 | { | |
293 | struct inode *inode; | |
294 | struct nilfs_dir_entry *de; | |
295 | struct page *page; | |
296 | struct nilfs_transaction_info ti; | |
47420c79 | 297 | int err; |
d2500652 RK |
298 | |
299 | err = nilfs_transaction_begin(dir->i_sb, &ti, 0); | |
300 | if (err) | |
301 | return err; | |
302 | ||
303 | err = -ENOENT; | |
304 | de = nilfs_find_entry(dir, dentry, &page); | |
305 | if (!de) | |
306 | goto out; | |
307 | ||
308 | inode = dentry->d_inode; | |
309 | err = -EIO; | |
310 | if (le64_to_cpu(de->inode) != inode->i_ino) | |
311 | goto out; | |
312 | ||
313 | if (!inode->i_nlink) { | |
314 | nilfs_warning(inode->i_sb, __func__, | |
315 | "deleting nonexistent file (%lu), %d\n", | |
316 | inode->i_ino, inode->i_nlink); | |
317 | inode->i_nlink = 1; | |
318 | } | |
319 | err = nilfs_delete_entry(de, page); | |
320 | if (err) | |
321 | goto out; | |
322 | ||
323 | inode->i_ctime = dir->i_ctime; | |
565de406 JS |
324 | drop_nlink(inode); |
325 | mark_inode_dirty(inode); | |
d2500652 RK |
326 | err = 0; |
327 | out: | |
47420c79 RK |
328 | if (!err) |
329 | err = nilfs_transaction_commit(dir->i_sb); | |
330 | else | |
331 | nilfs_transaction_abort(dir->i_sb); | |
332 | ||
333 | return err; | |
d2500652 RK |
334 | } |
335 | ||
336 | static int nilfs_rmdir(struct inode *dir, struct dentry *dentry) | |
337 | { | |
338 | struct inode *inode = dentry->d_inode; | |
339 | struct nilfs_transaction_info ti; | |
47420c79 | 340 | int err; |
d2500652 RK |
341 | |
342 | err = nilfs_transaction_begin(dir->i_sb, &ti, 0); | |
343 | if (err) | |
344 | return err; | |
345 | ||
346 | err = -ENOTEMPTY; | |
347 | if (nilfs_empty_dir(inode)) { | |
348 | err = nilfs_unlink(dir, dentry); | |
349 | if (!err) { | |
350 | inode->i_size = 0; | |
565de406 JS |
351 | drop_nlink(inode); |
352 | mark_inode_dirty(inode); | |
353 | drop_nlink(dir); | |
354 | mark_inode_dirty(dir); | |
d2500652 RK |
355 | } |
356 | } | |
47420c79 RK |
357 | if (!err) |
358 | err = nilfs_transaction_commit(dir->i_sb); | |
359 | else | |
360 | nilfs_transaction_abort(dir->i_sb); | |
361 | ||
362 | return err; | |
d2500652 RK |
363 | } |
364 | ||
365 | static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
366 | struct inode *new_dir, struct dentry *new_dentry) | |
367 | { | |
368 | struct inode *old_inode = old_dentry->d_inode; | |
369 | struct inode *new_inode = new_dentry->d_inode; | |
370 | struct page *dir_page = NULL; | |
371 | struct nilfs_dir_entry *dir_de = NULL; | |
372 | struct page *old_page; | |
373 | struct nilfs_dir_entry *old_de; | |
374 | struct nilfs_transaction_info ti; | |
375 | int err; | |
376 | ||
377 | err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1); | |
378 | if (unlikely(err)) | |
379 | return err; | |
380 | ||
381 | err = -ENOENT; | |
382 | old_de = nilfs_find_entry(old_dir, old_dentry, &old_page); | |
383 | if (!old_de) | |
384 | goto out; | |
385 | ||
386 | if (S_ISDIR(old_inode->i_mode)) { | |
387 | err = -EIO; | |
388 | dir_de = nilfs_dotdot(old_inode, &dir_page); | |
389 | if (!dir_de) | |
390 | goto out_old; | |
391 | } | |
392 | ||
393 | if (new_inode) { | |
394 | struct page *new_page; | |
395 | struct nilfs_dir_entry *new_de; | |
396 | ||
397 | err = -ENOTEMPTY; | |
398 | if (dir_de && !nilfs_empty_dir(new_inode)) | |
399 | goto out_dir; | |
400 | ||
401 | err = -ENOENT; | |
402 | new_de = nilfs_find_entry(new_dir, new_dentry, &new_page); | |
403 | if (!new_de) | |
404 | goto out_dir; | |
565de406 | 405 | inc_nlink(old_inode); |
d2500652 | 406 | nilfs_set_link(new_dir, new_de, new_page, old_inode); |
43f8bc26 | 407 | mark_inode_dirty(new_dir); |
d2500652 RK |
408 | new_inode->i_ctime = CURRENT_TIME; |
409 | if (dir_de) | |
410 | drop_nlink(new_inode); | |
565de406 JS |
411 | drop_nlink(new_inode); |
412 | mark_inode_dirty(new_inode); | |
d2500652 RK |
413 | } else { |
414 | if (dir_de) { | |
415 | err = -EMLINK; | |
416 | if (new_dir->i_nlink >= NILFS_LINK_MAX) | |
417 | goto out_dir; | |
418 | } | |
565de406 | 419 | inc_nlink(old_inode); |
d2500652 RK |
420 | err = nilfs_add_link(new_dentry, old_inode); |
421 | if (err) { | |
565de406 JS |
422 | drop_nlink(old_inode); |
423 | mark_inode_dirty(old_inode); | |
d2500652 RK |
424 | goto out_dir; |
425 | } | |
565de406 JS |
426 | if (dir_de) { |
427 | inc_nlink(new_dir); | |
428 | mark_inode_dirty(new_dir); | |
429 | } | |
d2500652 RK |
430 | } |
431 | ||
432 | /* | |
433 | * Like most other Unix systems, set the ctime for inodes on a | |
434 | * rename. | |
d2500652 RK |
435 | */ |
436 | old_inode->i_ctime = CURRENT_TIME; | |
437 | ||
438 | nilfs_delete_entry(old_de, old_page); | |
43f8bc26 | 439 | drop_nlink(old_inode); |
d2500652 RK |
440 | |
441 | if (dir_de) { | |
442 | nilfs_set_link(old_inode, dir_de, dir_page, new_dir); | |
565de406 JS |
443 | drop_nlink(old_dir); |
444 | mark_inode_dirty(old_dir); | |
d2500652 | 445 | } |
43f8bc26 | 446 | mark_inode_dirty(old_inode); |
d2500652 | 447 | |
47420c79 | 448 | err = nilfs_transaction_commit(old_dir->i_sb); |
d2500652 RK |
449 | return err; |
450 | ||
451 | out_dir: | |
452 | if (dir_de) { | |
453 | kunmap(dir_page); | |
454 | page_cache_release(dir_page); | |
455 | } | |
456 | out_old: | |
457 | kunmap(old_page); | |
458 | page_cache_release(old_page); | |
459 | out: | |
47420c79 | 460 | nilfs_transaction_abort(old_dir->i_sb); |
d2500652 RK |
461 | return err; |
462 | } | |
463 | ||
6e1d5dcc | 464 | const struct inode_operations nilfs_dir_inode_operations = { |
d2500652 RK |
465 | .create = nilfs_create, |
466 | .lookup = nilfs_lookup, | |
467 | .link = nilfs_link, | |
468 | .unlink = nilfs_unlink, | |
469 | .symlink = nilfs_symlink, | |
470 | .mkdir = nilfs_mkdir, | |
471 | .rmdir = nilfs_rmdir, | |
472 | .mknod = nilfs_mknod, | |
473 | .rename = nilfs_rename, | |
474 | .setattr = nilfs_setattr, | |
475 | .permission = nilfs_permission, | |
476 | }; | |
477 | ||
6e1d5dcc | 478 | const struct inode_operations nilfs_special_inode_operations = { |
d2500652 RK |
479 | .setattr = nilfs_setattr, |
480 | .permission = nilfs_permission, | |
481 | }; | |
482 | ||
6e1d5dcc | 483 | const struct inode_operations nilfs_symlink_inode_operations = { |
d2500652 RK |
484 | .readlink = generic_readlink, |
485 | .follow_link = page_follow_link_light, | |
486 | .put_link = page_put_link, | |
487 | }; |