Commit | Line | Data |
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57397d86 JK |
1 | /** |
2 | * fs/f2fs/namei.c | |
3 | * | |
4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
5 | * http://www.samsung.com/ | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/fs.h> | |
12 | #include <linux/f2fs_fs.h> | |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/ctype.h> | |
16 | ||
17 | #include "f2fs.h" | |
18 | #include "xattr.h" | |
19 | #include "acl.h" | |
20 | ||
21 | static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode) | |
22 | { | |
23 | struct super_block *sb = dir->i_sb; | |
24 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
25 | nid_t ino; | |
26 | struct inode *inode; | |
27 | bool nid_free = false; | |
28 | int err; | |
29 | ||
30 | inode = new_inode(sb); | |
31 | if (!inode) | |
32 | return ERR_PTR(-ENOMEM); | |
33 | ||
34 | mutex_lock_op(sbi, NODE_NEW); | |
35 | if (!alloc_nid(sbi, &ino)) { | |
36 | mutex_unlock_op(sbi, NODE_NEW); | |
37 | err = -ENOSPC; | |
38 | goto fail; | |
39 | } | |
40 | mutex_unlock_op(sbi, NODE_NEW); | |
41 | ||
42 | inode->i_uid = current_fsuid(); | |
43 | ||
44 | if (dir->i_mode & S_ISGID) { | |
45 | inode->i_gid = dir->i_gid; | |
46 | if (S_ISDIR(mode)) | |
47 | mode |= S_ISGID; | |
48 | } else { | |
49 | inode->i_gid = current_fsgid(); | |
50 | } | |
51 | ||
52 | inode->i_ino = ino; | |
53 | inode->i_mode = mode; | |
54 | inode->i_blocks = 0; | |
55 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
56 | inode->i_generation = sbi->s_next_generation++; | |
57 | ||
58 | err = insert_inode_locked(inode); | |
59 | if (err) { | |
60 | err = -EINVAL; | |
61 | nid_free = true; | |
62 | goto out; | |
63 | } | |
64 | ||
65 | mark_inode_dirty(inode); | |
66 | return inode; | |
67 | ||
68 | out: | |
69 | clear_nlink(inode); | |
70 | unlock_new_inode(inode); | |
71 | fail: | |
72 | iput(inode); | |
73 | if (nid_free) | |
74 | alloc_nid_failed(sbi, ino); | |
75 | return ERR_PTR(err); | |
76 | } | |
77 | ||
78 | static int is_multimedia_file(const unsigned char *s, const char *sub) | |
79 | { | |
80 | int slen = strlen(s); | |
81 | int sublen = strlen(sub); | |
82 | int ret; | |
83 | ||
84 | if (sublen > slen) | |
85 | return 1; | |
86 | ||
87 | ret = memcmp(s + slen - sublen, sub, sublen); | |
88 | if (ret) { /* compare upper case */ | |
89 | int i; | |
90 | char upper_sub[8]; | |
91 | for (i = 0; i < sublen && i < sizeof(upper_sub); i++) | |
92 | upper_sub[i] = toupper(sub[i]); | |
93 | return memcmp(s + slen - sublen, upper_sub, sublen); | |
94 | } | |
95 | ||
96 | return ret; | |
97 | } | |
98 | ||
99 | /** | |
100 | * Set multimedia files as cold files for hot/cold data separation | |
101 | */ | |
102 | static inline void set_cold_file(struct f2fs_sb_info *sbi, struct inode *inode, | |
103 | const unsigned char *name) | |
104 | { | |
105 | int i; | |
106 | __u8 (*extlist)[8] = sbi->raw_super->extension_list; | |
107 | ||
108 | int count = le32_to_cpu(sbi->raw_super->extension_count); | |
109 | for (i = 0; i < count; i++) { | |
110 | if (!is_multimedia_file(name, extlist[i])) { | |
111 | F2FS_I(inode)->i_advise |= FADVISE_COLD_BIT; | |
112 | break; | |
113 | } | |
114 | } | |
115 | } | |
116 | ||
117 | static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode, | |
118 | bool excl) | |
119 | { | |
120 | struct super_block *sb = dir->i_sb; | |
121 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
122 | struct inode *inode; | |
123 | nid_t ino = 0; | |
124 | int err; | |
125 | ||
126 | inode = f2fs_new_inode(dir, mode); | |
127 | if (IS_ERR(inode)) | |
128 | return PTR_ERR(inode); | |
129 | ||
130 | if (!test_opt(sbi, DISABLE_EXT_IDENTIFY)) | |
131 | set_cold_file(sbi, inode, dentry->d_name.name); | |
132 | ||
133 | inode->i_op = &f2fs_file_inode_operations; | |
134 | inode->i_fop = &f2fs_file_operations; | |
135 | inode->i_mapping->a_ops = &f2fs_dblock_aops; | |
136 | ino = inode->i_ino; | |
137 | ||
138 | err = f2fs_add_link(dentry, inode); | |
139 | if (err) | |
140 | goto out; | |
141 | ||
142 | alloc_nid_done(sbi, ino); | |
143 | ||
144 | if (!sbi->por_doing) | |
145 | d_instantiate(dentry, inode); | |
146 | unlock_new_inode(inode); | |
147 | ||
148 | f2fs_balance_fs(sbi); | |
149 | return 0; | |
150 | out: | |
151 | clear_nlink(inode); | |
152 | unlock_new_inode(inode); | |
153 | iput(inode); | |
154 | alloc_nid_failed(sbi, ino); | |
155 | return err; | |
156 | } | |
157 | ||
158 | static int f2fs_link(struct dentry *old_dentry, struct inode *dir, | |
159 | struct dentry *dentry) | |
160 | { | |
161 | struct inode *inode = old_dentry->d_inode; | |
162 | struct super_block *sb = dir->i_sb; | |
163 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
164 | int err; | |
165 | ||
166 | inode->i_ctime = CURRENT_TIME; | |
167 | atomic_inc(&inode->i_count); | |
168 | ||
169 | set_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
170 | err = f2fs_add_link(dentry, inode); | |
171 | if (err) | |
172 | goto out; | |
173 | ||
174 | d_instantiate(dentry, inode); | |
175 | ||
176 | f2fs_balance_fs(sbi); | |
177 | return 0; | |
178 | out: | |
179 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
180 | iput(inode); | |
181 | return err; | |
182 | } | |
183 | ||
184 | struct dentry *f2fs_get_parent(struct dentry *child) | |
185 | { | |
186 | struct qstr dotdot = QSTR_INIT("..", 2); | |
187 | unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot); | |
188 | if (!ino) | |
189 | return ERR_PTR(-ENOENT); | |
190 | return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino)); | |
191 | } | |
192 | ||
193 | static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, | |
194 | unsigned int flags) | |
195 | { | |
196 | struct inode *inode = NULL; | |
197 | struct f2fs_dir_entry *de; | |
198 | struct page *page; | |
199 | ||
200 | if (dentry->d_name.len > F2FS_MAX_NAME_LEN) | |
201 | return ERR_PTR(-ENAMETOOLONG); | |
202 | ||
203 | de = f2fs_find_entry(dir, &dentry->d_name, &page); | |
204 | if (de) { | |
205 | nid_t ino = le32_to_cpu(de->ino); | |
206 | kunmap(page); | |
207 | f2fs_put_page(page, 0); | |
208 | ||
209 | inode = f2fs_iget(dir->i_sb, ino); | |
210 | if (IS_ERR(inode)) | |
211 | return ERR_CAST(inode); | |
212 | } | |
213 | ||
214 | return d_splice_alias(inode, dentry); | |
215 | } | |
216 | ||
217 | static int f2fs_unlink(struct inode *dir, struct dentry *dentry) | |
218 | { | |
219 | struct super_block *sb = dir->i_sb; | |
220 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
221 | struct inode *inode = dentry->d_inode; | |
222 | struct f2fs_dir_entry *de; | |
223 | struct page *page; | |
224 | int err = -ENOENT; | |
225 | ||
226 | de = f2fs_find_entry(dir, &dentry->d_name, &page); | |
227 | if (!de) | |
228 | goto fail; | |
229 | ||
230 | err = check_orphan_space(sbi); | |
231 | if (err) { | |
232 | kunmap(page); | |
233 | f2fs_put_page(page, 0); | |
234 | goto fail; | |
235 | } | |
236 | ||
237 | f2fs_delete_entry(de, page, inode); | |
238 | ||
239 | /* In order to evict this inode, we set it dirty */ | |
240 | mark_inode_dirty(inode); | |
241 | f2fs_balance_fs(sbi); | |
242 | fail: | |
243 | return err; | |
244 | } | |
245 | ||
246 | static int f2fs_symlink(struct inode *dir, struct dentry *dentry, | |
247 | const char *symname) | |
248 | { | |
249 | struct super_block *sb = dir->i_sb; | |
250 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
251 | struct inode *inode; | |
252 | unsigned symlen = strlen(symname) + 1; | |
253 | int err; | |
254 | ||
255 | inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO); | |
256 | if (IS_ERR(inode)) | |
257 | return PTR_ERR(inode); | |
258 | ||
259 | inode->i_op = &f2fs_symlink_inode_operations; | |
260 | inode->i_mapping->a_ops = &f2fs_dblock_aops; | |
261 | ||
262 | err = f2fs_add_link(dentry, inode); | |
263 | if (err) | |
264 | goto out; | |
265 | ||
266 | err = page_symlink(inode, symname, symlen); | |
267 | alloc_nid_done(sbi, inode->i_ino); | |
268 | ||
269 | d_instantiate(dentry, inode); | |
270 | unlock_new_inode(inode); | |
271 | ||
272 | f2fs_balance_fs(sbi); | |
273 | ||
274 | return err; | |
275 | out: | |
276 | clear_nlink(inode); | |
277 | unlock_new_inode(inode); | |
278 | iput(inode); | |
279 | alloc_nid_failed(sbi, inode->i_ino); | |
280 | return err; | |
281 | } | |
282 | ||
283 | static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) | |
284 | { | |
285 | struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); | |
286 | struct inode *inode; | |
287 | int err; | |
288 | ||
289 | inode = f2fs_new_inode(dir, S_IFDIR | mode); | |
290 | err = PTR_ERR(inode); | |
291 | if (IS_ERR(inode)) | |
292 | return err; | |
293 | ||
294 | inode->i_op = &f2fs_dir_inode_operations; | |
295 | inode->i_fop = &f2fs_dir_operations; | |
296 | inode->i_mapping->a_ops = &f2fs_dblock_aops; | |
297 | mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS | __GFP_ZERO); | |
298 | ||
299 | set_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
300 | err = f2fs_add_link(dentry, inode); | |
301 | if (err) | |
302 | goto out_fail; | |
303 | ||
304 | alloc_nid_done(sbi, inode->i_ino); | |
305 | ||
306 | d_instantiate(dentry, inode); | |
307 | unlock_new_inode(inode); | |
308 | ||
309 | f2fs_balance_fs(sbi); | |
310 | return 0; | |
311 | ||
312 | out_fail: | |
313 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
314 | clear_nlink(inode); | |
315 | unlock_new_inode(inode); | |
316 | iput(inode); | |
317 | alloc_nid_failed(sbi, inode->i_ino); | |
318 | return err; | |
319 | } | |
320 | ||
321 | static int f2fs_rmdir(struct inode *dir, struct dentry *dentry) | |
322 | { | |
323 | struct inode *inode = dentry->d_inode; | |
324 | if (f2fs_empty_dir(inode)) | |
325 | return f2fs_unlink(dir, dentry); | |
326 | return -ENOTEMPTY; | |
327 | } | |
328 | ||
329 | static int f2fs_mknod(struct inode *dir, struct dentry *dentry, | |
330 | umode_t mode, dev_t rdev) | |
331 | { | |
332 | struct super_block *sb = dir->i_sb; | |
333 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
334 | struct inode *inode; | |
335 | int err = 0; | |
336 | ||
337 | if (!new_valid_dev(rdev)) | |
338 | return -EINVAL; | |
339 | ||
340 | inode = f2fs_new_inode(dir, mode); | |
341 | if (IS_ERR(inode)) | |
342 | return PTR_ERR(inode); | |
343 | ||
344 | init_special_inode(inode, inode->i_mode, rdev); | |
345 | inode->i_op = &f2fs_special_inode_operations; | |
346 | ||
347 | err = f2fs_add_link(dentry, inode); | |
348 | if (err) | |
349 | goto out; | |
350 | ||
351 | alloc_nid_done(sbi, inode->i_ino); | |
352 | d_instantiate(dentry, inode); | |
353 | unlock_new_inode(inode); | |
354 | ||
355 | f2fs_balance_fs(sbi); | |
356 | ||
357 | return 0; | |
358 | out: | |
359 | clear_nlink(inode); | |
360 | unlock_new_inode(inode); | |
361 | iput(inode); | |
362 | alloc_nid_failed(sbi, inode->i_ino); | |
363 | return err; | |
364 | } | |
365 | ||
366 | static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
367 | struct inode *new_dir, struct dentry *new_dentry) | |
368 | { | |
369 | struct super_block *sb = old_dir->i_sb; | |
370 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
371 | struct inode *old_inode = old_dentry->d_inode; | |
372 | struct inode *new_inode = new_dentry->d_inode; | |
373 | struct page *old_dir_page; | |
374 | struct page *old_page; | |
375 | struct f2fs_dir_entry *old_dir_entry = NULL; | |
376 | struct f2fs_dir_entry *old_entry; | |
377 | struct f2fs_dir_entry *new_entry; | |
378 | int err = -ENOENT; | |
379 | ||
380 | old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); | |
381 | if (!old_entry) | |
382 | goto out; | |
383 | ||
384 | if (S_ISDIR(old_inode->i_mode)) { | |
385 | err = -EIO; | |
386 | old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page); | |
387 | if (!old_dir_entry) | |
388 | goto out_old; | |
389 | } | |
390 | ||
391 | mutex_lock_op(sbi, RENAME); | |
392 | ||
393 | if (new_inode) { | |
394 | struct page *new_page; | |
395 | ||
396 | err = -ENOTEMPTY; | |
397 | if (old_dir_entry && !f2fs_empty_dir(new_inode)) | |
398 | goto out_dir; | |
399 | ||
400 | err = -ENOENT; | |
401 | new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, | |
402 | &new_page); | |
403 | if (!new_entry) | |
404 | goto out_dir; | |
405 | ||
406 | f2fs_set_link(new_dir, new_entry, new_page, old_inode); | |
407 | ||
408 | new_inode->i_ctime = CURRENT_TIME; | |
409 | if (old_dir_entry) | |
410 | drop_nlink(new_inode); | |
411 | drop_nlink(new_inode); | |
412 | if (!new_inode->i_nlink) | |
413 | add_orphan_inode(sbi, new_inode->i_ino); | |
414 | f2fs_write_inode(new_inode, NULL); | |
415 | } else { | |
416 | err = f2fs_add_link(new_dentry, old_inode); | |
417 | if (err) | |
418 | goto out_dir; | |
419 | ||
420 | if (old_dir_entry) { | |
421 | inc_nlink(new_dir); | |
422 | f2fs_write_inode(new_dir, NULL); | |
423 | } | |
424 | } | |
425 | ||
426 | old_inode->i_ctime = CURRENT_TIME; | |
427 | set_inode_flag(F2FS_I(old_inode), FI_NEED_CP); | |
428 | mark_inode_dirty(old_inode); | |
429 | ||
430 | f2fs_delete_entry(old_entry, old_page, NULL); | |
431 | ||
432 | if (old_dir_entry) { | |
433 | if (old_dir != new_dir) { | |
434 | f2fs_set_link(old_inode, old_dir_entry, | |
435 | old_dir_page, new_dir); | |
436 | } else { | |
437 | kunmap(old_dir_page); | |
438 | f2fs_put_page(old_dir_page, 0); | |
439 | } | |
440 | drop_nlink(old_dir); | |
441 | f2fs_write_inode(old_dir, NULL); | |
442 | } | |
443 | ||
444 | mutex_unlock_op(sbi, RENAME); | |
445 | ||
446 | f2fs_balance_fs(sbi); | |
447 | return 0; | |
448 | ||
449 | out_dir: | |
450 | if (old_dir_entry) { | |
451 | kunmap(old_dir_page); | |
452 | f2fs_put_page(old_dir_page, 0); | |
453 | } | |
454 | mutex_unlock_op(sbi, RENAME); | |
455 | out_old: | |
456 | kunmap(old_page); | |
457 | f2fs_put_page(old_page, 0); | |
458 | out: | |
459 | return err; | |
460 | } | |
461 | ||
462 | const struct inode_operations f2fs_dir_inode_operations = { | |
463 | .create = f2fs_create, | |
464 | .lookup = f2fs_lookup, | |
465 | .link = f2fs_link, | |
466 | .unlink = f2fs_unlink, | |
467 | .symlink = f2fs_symlink, | |
468 | .mkdir = f2fs_mkdir, | |
469 | .rmdir = f2fs_rmdir, | |
470 | .mknod = f2fs_mknod, | |
471 | .rename = f2fs_rename, | |
472 | .setattr = f2fs_setattr, | |
473 | .get_acl = f2fs_get_acl, | |
474 | #ifdef CONFIG_F2FS_FS_XATTR | |
475 | .setxattr = generic_setxattr, | |
476 | .getxattr = generic_getxattr, | |
477 | .listxattr = f2fs_listxattr, | |
478 | .removexattr = generic_removexattr, | |
479 | #endif | |
480 | }; | |
481 | ||
482 | const struct inode_operations f2fs_symlink_inode_operations = { | |
483 | .readlink = generic_readlink, | |
484 | .follow_link = page_follow_link_light, | |
485 | .put_link = page_put_link, | |
486 | .setattr = f2fs_setattr, | |
487 | #ifdef CONFIG_F2FS_FS_XATTR | |
488 | .setxattr = generic_setxattr, | |
489 | .getxattr = generic_getxattr, | |
490 | .listxattr = f2fs_listxattr, | |
491 | .removexattr = generic_removexattr, | |
492 | #endif | |
493 | }; | |
494 | ||
495 | const struct inode_operations f2fs_special_inode_operations = { | |
496 | .setattr = f2fs_setattr, | |
497 | .get_acl = f2fs_get_acl, | |
498 | #ifdef CONFIG_F2FS_FS_XATTR | |
499 | .setxattr = generic_setxattr, | |
500 | .getxattr = generic_getxattr, | |
501 | .listxattr = f2fs_listxattr, | |
502 | .removexattr = generic_removexattr, | |
503 | #endif | |
504 | }; |