Commit | Line | Data |
---|---|---|
0a8165d7 | 1 | /* |
57397d86 JK |
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" | |
953a3e27 | 18 | #include "node.h" |
57397d86 JK |
19 | #include "xattr.h" |
20 | #include "acl.h" | |
a2a4a7e4 | 21 | #include <trace/events/f2fs.h> |
57397d86 JK |
22 | |
23 | static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode) | |
24 | { | |
25 | struct super_block *sb = dir->i_sb; | |
26 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
27 | nid_t ino; | |
28 | struct inode *inode; | |
29 | bool nid_free = false; | |
39936837 | 30 | int err, ilock; |
57397d86 JK |
31 | |
32 | inode = new_inode(sb); | |
33 | if (!inode) | |
34 | return ERR_PTR(-ENOMEM); | |
35 | ||
39936837 | 36 | ilock = mutex_lock_op(sbi); |
57397d86 | 37 | if (!alloc_nid(sbi, &ino)) { |
39936837 | 38 | mutex_unlock_op(sbi, ilock); |
57397d86 JK |
39 | err = -ENOSPC; |
40 | goto fail; | |
41 | } | |
39936837 | 42 | mutex_unlock_op(sbi, ilock); |
57397d86 JK |
43 | |
44 | inode->i_uid = current_fsuid(); | |
45 | ||
46 | if (dir->i_mode & S_ISGID) { | |
47 | inode->i_gid = dir->i_gid; | |
48 | if (S_ISDIR(mode)) | |
49 | mode |= S_ISGID; | |
50 | } else { | |
51 | inode->i_gid = current_fsgid(); | |
52 | } | |
53 | ||
54 | inode->i_ino = ino; | |
55 | inode->i_mode = mode; | |
56 | inode->i_blocks = 0; | |
57 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
58 | inode->i_generation = sbi->s_next_generation++; | |
59 | ||
60 | err = insert_inode_locked(inode); | |
61 | if (err) { | |
62 | err = -EINVAL; | |
63 | nid_free = true; | |
64 | goto out; | |
65 | } | |
d70b4f53 | 66 | trace_f2fs_new_inode(inode, 0); |
57397d86 JK |
67 | mark_inode_dirty(inode); |
68 | return inode; | |
69 | ||
70 | out: | |
71 | clear_nlink(inode); | |
72 | unlock_new_inode(inode); | |
73 | fail: | |
d70b4f53 | 74 | trace_f2fs_new_inode(inode, err); |
531ad7d5 | 75 | make_bad_inode(inode); |
57397d86 JK |
76 | iput(inode); |
77 | if (nid_free) | |
78 | alloc_nid_failed(sbi, ino); | |
79 | return ERR_PTR(err); | |
80 | } | |
81 | ||
82 | static int is_multimedia_file(const unsigned char *s, const char *sub) | |
83 | { | |
9836b8b9 LR |
84 | size_t slen = strlen(s); |
85 | size_t sublen = strlen(sub); | |
57397d86 JK |
86 | int ret; |
87 | ||
88 | if (sublen > slen) | |
e66509f0 | 89 | return 0; |
57397d86 JK |
90 | |
91 | ret = memcmp(s + slen - sublen, sub, sublen); | |
92 | if (ret) { /* compare upper case */ | |
93 | int i; | |
94 | char upper_sub[8]; | |
95 | for (i = 0; i < sublen && i < sizeof(upper_sub); i++) | |
96 | upper_sub[i] = toupper(sub[i]); | |
e66509f0 | 97 | return !memcmp(s + slen - sublen, upper_sub, sublen); |
57397d86 JK |
98 | } |
99 | ||
e66509f0 | 100 | return !ret; |
57397d86 JK |
101 | } |
102 | ||
0a8165d7 | 103 | /* |
57397d86 JK |
104 | * Set multimedia files as cold files for hot/cold data separation |
105 | */ | |
953a3e27 | 106 | static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode, |
57397d86 JK |
107 | const unsigned char *name) |
108 | { | |
109 | int i; | |
110 | __u8 (*extlist)[8] = sbi->raw_super->extension_list; | |
111 | ||
112 | int count = le32_to_cpu(sbi->raw_super->extension_count); | |
113 | for (i = 0; i < count; i++) { | |
e66509f0 | 114 | if (is_multimedia_file(name, extlist[i])) { |
354a3399 | 115 | file_set_cold(inode); |
57397d86 JK |
116 | break; |
117 | } | |
118 | } | |
119 | } | |
120 | ||
121 | static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode, | |
122 | bool excl) | |
123 | { | |
124 | struct super_block *sb = dir->i_sb; | |
125 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
126 | struct inode *inode; | |
127 | nid_t ino = 0; | |
39936837 | 128 | int err, ilock; |
57397d86 | 129 | |
1efef832 JK |
130 | f2fs_balance_fs(sbi); |
131 | ||
57397d86 JK |
132 | inode = f2fs_new_inode(dir, mode); |
133 | if (IS_ERR(inode)) | |
134 | return PTR_ERR(inode); | |
135 | ||
136 | if (!test_opt(sbi, DISABLE_EXT_IDENTIFY)) | |
953a3e27 | 137 | set_cold_files(sbi, inode, dentry->d_name.name); |
57397d86 JK |
138 | |
139 | inode->i_op = &f2fs_file_inode_operations; | |
140 | inode->i_fop = &f2fs_file_operations; | |
141 | inode->i_mapping->a_ops = &f2fs_dblock_aops; | |
142 | ino = inode->i_ino; | |
143 | ||
39936837 | 144 | ilock = mutex_lock_op(sbi); |
57397d86 | 145 | err = f2fs_add_link(dentry, inode); |
39936837 | 146 | mutex_unlock_op(sbi, ilock); |
57397d86 JK |
147 | if (err) |
148 | goto out; | |
149 | ||
150 | alloc_nid_done(sbi, ino); | |
151 | ||
0a364af1 | 152 | d_instantiate(dentry, inode); |
57397d86 | 153 | unlock_new_inode(inode); |
57397d86 JK |
154 | return 0; |
155 | out: | |
156 | clear_nlink(inode); | |
157 | unlock_new_inode(inode); | |
531ad7d5 | 158 | make_bad_inode(inode); |
57397d86 JK |
159 | iput(inode); |
160 | alloc_nid_failed(sbi, ino); | |
161 | return err; | |
162 | } | |
163 | ||
164 | static int f2fs_link(struct dentry *old_dentry, struct inode *dir, | |
165 | struct dentry *dentry) | |
166 | { | |
167 | struct inode *inode = old_dentry->d_inode; | |
168 | struct super_block *sb = dir->i_sb; | |
169 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
39936837 | 170 | int err, ilock; |
57397d86 | 171 | |
1efef832 JK |
172 | f2fs_balance_fs(sbi); |
173 | ||
57397d86 | 174 | inode->i_ctime = CURRENT_TIME; |
6f6fd833 | 175 | ihold(inode); |
57397d86 JK |
176 | |
177 | set_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
39936837 | 178 | ilock = mutex_lock_op(sbi); |
57397d86 | 179 | err = f2fs_add_link(dentry, inode); |
39936837 | 180 | mutex_unlock_op(sbi, ilock); |
57397d86 JK |
181 | if (err) |
182 | goto out; | |
183 | ||
184 | d_instantiate(dentry, inode); | |
57397d86 JK |
185 | return 0; |
186 | out: | |
187 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
188 | iput(inode); | |
189 | return err; | |
190 | } | |
191 | ||
192 | struct dentry *f2fs_get_parent(struct dentry *child) | |
193 | { | |
194 | struct qstr dotdot = QSTR_INIT("..", 2); | |
195 | unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot); | |
196 | if (!ino) | |
197 | return ERR_PTR(-ENOENT); | |
198 | return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino)); | |
199 | } | |
200 | ||
201 | static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, | |
202 | unsigned int flags) | |
203 | { | |
204 | struct inode *inode = NULL; | |
205 | struct f2fs_dir_entry *de; | |
206 | struct page *page; | |
207 | ||
5a20d339 | 208 | if (dentry->d_name.len > F2FS_NAME_LEN) |
57397d86 JK |
209 | return ERR_PTR(-ENAMETOOLONG); |
210 | ||
211 | de = f2fs_find_entry(dir, &dentry->d_name, &page); | |
212 | if (de) { | |
213 | nid_t ino = le32_to_cpu(de->ino); | |
214 | kunmap(page); | |
215 | f2fs_put_page(page, 0); | |
216 | ||
217 | inode = f2fs_iget(dir->i_sb, ino); | |
218 | if (IS_ERR(inode)) | |
219 | return ERR_CAST(inode); | |
220 | } | |
221 | ||
222 | return d_splice_alias(inode, dentry); | |
223 | } | |
224 | ||
225 | static int f2fs_unlink(struct inode *dir, struct dentry *dentry) | |
226 | { | |
227 | struct super_block *sb = dir->i_sb; | |
228 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
229 | struct inode *inode = dentry->d_inode; | |
230 | struct f2fs_dir_entry *de; | |
231 | struct page *page; | |
232 | int err = -ENOENT; | |
39936837 | 233 | int ilock; |
57397d86 | 234 | |
a2a4a7e4 | 235 | trace_f2fs_unlink_enter(dir, dentry); |
1efef832 JK |
236 | f2fs_balance_fs(sbi); |
237 | ||
57397d86 JK |
238 | de = f2fs_find_entry(dir, &dentry->d_name, &page); |
239 | if (!de) | |
240 | goto fail; | |
241 | ||
242 | err = check_orphan_space(sbi); | |
243 | if (err) { | |
244 | kunmap(page); | |
245 | f2fs_put_page(page, 0); | |
246 | goto fail; | |
247 | } | |
248 | ||
39936837 | 249 | ilock = mutex_lock_op(sbi); |
57397d86 | 250 | f2fs_delete_entry(de, page, inode); |
39936837 | 251 | mutex_unlock_op(sbi, ilock); |
57397d86 JK |
252 | |
253 | /* In order to evict this inode, we set it dirty */ | |
254 | mark_inode_dirty(inode); | |
57397d86 | 255 | fail: |
a2a4a7e4 | 256 | trace_f2fs_unlink_exit(inode, err); |
57397d86 JK |
257 | return err; |
258 | } | |
259 | ||
260 | static int f2fs_symlink(struct inode *dir, struct dentry *dentry, | |
261 | const char *symname) | |
262 | { | |
263 | struct super_block *sb = dir->i_sb; | |
264 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
265 | struct inode *inode; | |
9836b8b9 | 266 | size_t symlen = strlen(symname) + 1; |
39936837 | 267 | int err, ilock; |
57397d86 | 268 | |
1efef832 JK |
269 | f2fs_balance_fs(sbi); |
270 | ||
57397d86 JK |
271 | inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO); |
272 | if (IS_ERR(inode)) | |
273 | return PTR_ERR(inode); | |
274 | ||
275 | inode->i_op = &f2fs_symlink_inode_operations; | |
276 | inode->i_mapping->a_ops = &f2fs_dblock_aops; | |
277 | ||
39936837 | 278 | ilock = mutex_lock_op(sbi); |
57397d86 | 279 | err = f2fs_add_link(dentry, inode); |
39936837 | 280 | mutex_unlock_op(sbi, ilock); |
57397d86 JK |
281 | if (err) |
282 | goto out; | |
283 | ||
284 | err = page_symlink(inode, symname, symlen); | |
285 | alloc_nid_done(sbi, inode->i_ino); | |
286 | ||
287 | d_instantiate(dentry, inode); | |
288 | unlock_new_inode(inode); | |
57397d86 JK |
289 | return err; |
290 | out: | |
291 | clear_nlink(inode); | |
292 | unlock_new_inode(inode); | |
531ad7d5 | 293 | make_bad_inode(inode); |
57397d86 JK |
294 | iput(inode); |
295 | alloc_nid_failed(sbi, inode->i_ino); | |
296 | return err; | |
297 | } | |
298 | ||
299 | static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) | |
300 | { | |
301 | struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); | |
302 | struct inode *inode; | |
39936837 | 303 | int err, ilock; |
57397d86 | 304 | |
1efef832 JK |
305 | f2fs_balance_fs(sbi); |
306 | ||
57397d86 | 307 | inode = f2fs_new_inode(dir, S_IFDIR | mode); |
57397d86 | 308 | if (IS_ERR(inode)) |
61412b64 | 309 | return PTR_ERR(inode); |
57397d86 JK |
310 | |
311 | inode->i_op = &f2fs_dir_inode_operations; | |
312 | inode->i_fop = &f2fs_dir_operations; | |
313 | inode->i_mapping->a_ops = &f2fs_dblock_aops; | |
a0d42539 | 314 | mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO); |
57397d86 JK |
315 | |
316 | set_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
39936837 | 317 | ilock = mutex_lock_op(sbi); |
57397d86 | 318 | err = f2fs_add_link(dentry, inode); |
39936837 | 319 | mutex_unlock_op(sbi, ilock); |
57397d86 JK |
320 | if (err) |
321 | goto out_fail; | |
322 | ||
323 | alloc_nid_done(sbi, inode->i_ino); | |
324 | ||
325 | d_instantiate(dentry, inode); | |
326 | unlock_new_inode(inode); | |
327 | ||
57397d86 JK |
328 | return 0; |
329 | ||
330 | out_fail: | |
331 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
332 | clear_nlink(inode); | |
333 | unlock_new_inode(inode); | |
531ad7d5 | 334 | make_bad_inode(inode); |
57397d86 JK |
335 | iput(inode); |
336 | alloc_nid_failed(sbi, inode->i_ino); | |
337 | return err; | |
338 | } | |
339 | ||
340 | static int f2fs_rmdir(struct inode *dir, struct dentry *dentry) | |
341 | { | |
342 | struct inode *inode = dentry->d_inode; | |
343 | if (f2fs_empty_dir(inode)) | |
344 | return f2fs_unlink(dir, dentry); | |
345 | return -ENOTEMPTY; | |
346 | } | |
347 | ||
348 | static int f2fs_mknod(struct inode *dir, struct dentry *dentry, | |
349 | umode_t mode, dev_t rdev) | |
350 | { | |
351 | struct super_block *sb = dir->i_sb; | |
352 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
353 | struct inode *inode; | |
354 | int err = 0; | |
39936837 | 355 | int ilock; |
57397d86 JK |
356 | |
357 | if (!new_valid_dev(rdev)) | |
358 | return -EINVAL; | |
359 | ||
1efef832 JK |
360 | f2fs_balance_fs(sbi); |
361 | ||
57397d86 JK |
362 | inode = f2fs_new_inode(dir, mode); |
363 | if (IS_ERR(inode)) | |
364 | return PTR_ERR(inode); | |
365 | ||
366 | init_special_inode(inode, inode->i_mode, rdev); | |
367 | inode->i_op = &f2fs_special_inode_operations; | |
368 | ||
39936837 | 369 | ilock = mutex_lock_op(sbi); |
57397d86 | 370 | err = f2fs_add_link(dentry, inode); |
39936837 | 371 | mutex_unlock_op(sbi, ilock); |
57397d86 JK |
372 | if (err) |
373 | goto out; | |
374 | ||
375 | alloc_nid_done(sbi, inode->i_ino); | |
376 | d_instantiate(dentry, inode); | |
377 | unlock_new_inode(inode); | |
57397d86 JK |
378 | return 0; |
379 | out: | |
380 | clear_nlink(inode); | |
381 | unlock_new_inode(inode); | |
531ad7d5 | 382 | make_bad_inode(inode); |
57397d86 JK |
383 | iput(inode); |
384 | alloc_nid_failed(sbi, inode->i_ino); | |
385 | return err; | |
386 | } | |
387 | ||
388 | static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
389 | struct inode *new_dir, struct dentry *new_dentry) | |
390 | { | |
391 | struct super_block *sb = old_dir->i_sb; | |
392 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
393 | struct inode *old_inode = old_dentry->d_inode; | |
394 | struct inode *new_inode = new_dentry->d_inode; | |
395 | struct page *old_dir_page; | |
396 | struct page *old_page; | |
397 | struct f2fs_dir_entry *old_dir_entry = NULL; | |
398 | struct f2fs_dir_entry *old_entry; | |
399 | struct f2fs_dir_entry *new_entry; | |
39936837 | 400 | int err = -ENOENT, ilock = -1; |
57397d86 | 401 | |
1efef832 JK |
402 | f2fs_balance_fs(sbi); |
403 | ||
57397d86 JK |
404 | old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
405 | if (!old_entry) | |
406 | goto out; | |
407 | ||
408 | if (S_ISDIR(old_inode->i_mode)) { | |
409 | err = -EIO; | |
410 | old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page); | |
411 | if (!old_dir_entry) | |
412 | goto out_old; | |
413 | } | |
414 | ||
39936837 | 415 | ilock = mutex_lock_op(sbi); |
57397d86 JK |
416 | |
417 | if (new_inode) { | |
418 | struct page *new_page; | |
419 | ||
420 | err = -ENOTEMPTY; | |
421 | if (old_dir_entry && !f2fs_empty_dir(new_inode)) | |
422 | goto out_dir; | |
423 | ||
424 | err = -ENOENT; | |
425 | new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, | |
426 | &new_page); | |
427 | if (!new_entry) | |
428 | goto out_dir; | |
429 | ||
430 | f2fs_set_link(new_dir, new_entry, new_page, old_inode); | |
431 | ||
432 | new_inode->i_ctime = CURRENT_TIME; | |
433 | if (old_dir_entry) | |
434 | drop_nlink(new_inode); | |
435 | drop_nlink(new_inode); | |
436 | if (!new_inode->i_nlink) | |
437 | add_orphan_inode(sbi, new_inode->i_ino); | |
39936837 | 438 | update_inode_page(new_inode); |
57397d86 JK |
439 | } else { |
440 | err = f2fs_add_link(new_dentry, old_inode); | |
441 | if (err) | |
442 | goto out_dir; | |
443 | ||
444 | if (old_dir_entry) { | |
445 | inc_nlink(new_dir); | |
39936837 | 446 | update_inode_page(new_dir); |
57397d86 JK |
447 | } |
448 | } | |
449 | ||
450 | old_inode->i_ctime = CURRENT_TIME; | |
57397d86 JK |
451 | mark_inode_dirty(old_inode); |
452 | ||
453 | f2fs_delete_entry(old_entry, old_page, NULL); | |
454 | ||
455 | if (old_dir_entry) { | |
456 | if (old_dir != new_dir) { | |
457 | f2fs_set_link(old_inode, old_dir_entry, | |
458 | old_dir_page, new_dir); | |
459 | } else { | |
460 | kunmap(old_dir_page); | |
461 | f2fs_put_page(old_dir_page, 0); | |
462 | } | |
463 | drop_nlink(old_dir); | |
39936837 | 464 | update_inode_page(old_dir); |
57397d86 JK |
465 | } |
466 | ||
39936837 | 467 | mutex_unlock_op(sbi, ilock); |
57397d86 JK |
468 | return 0; |
469 | ||
470 | out_dir: | |
471 | if (old_dir_entry) { | |
472 | kunmap(old_dir_page); | |
473 | f2fs_put_page(old_dir_page, 0); | |
474 | } | |
39936837 | 475 | mutex_unlock_op(sbi, ilock); |
57397d86 JK |
476 | out_old: |
477 | kunmap(old_page); | |
478 | f2fs_put_page(old_page, 0); | |
479 | out: | |
480 | return err; | |
481 | } | |
482 | ||
483 | const struct inode_operations f2fs_dir_inode_operations = { | |
484 | .create = f2fs_create, | |
485 | .lookup = f2fs_lookup, | |
486 | .link = f2fs_link, | |
487 | .unlink = f2fs_unlink, | |
488 | .symlink = f2fs_symlink, | |
489 | .mkdir = f2fs_mkdir, | |
490 | .rmdir = f2fs_rmdir, | |
491 | .mknod = f2fs_mknod, | |
492 | .rename = f2fs_rename, | |
2d4d9fb5 | 493 | .getattr = f2fs_getattr, |
57397d86 JK |
494 | .setattr = f2fs_setattr, |
495 | .get_acl = f2fs_get_acl, | |
496 | #ifdef CONFIG_F2FS_FS_XATTR | |
497 | .setxattr = generic_setxattr, | |
498 | .getxattr = generic_getxattr, | |
499 | .listxattr = f2fs_listxattr, | |
500 | .removexattr = generic_removexattr, | |
501 | #endif | |
502 | }; | |
503 | ||
504 | const struct inode_operations f2fs_symlink_inode_operations = { | |
505 | .readlink = generic_readlink, | |
506 | .follow_link = page_follow_link_light, | |
507 | .put_link = page_put_link, | |
2d4d9fb5 | 508 | .getattr = f2fs_getattr, |
57397d86 JK |
509 | .setattr = f2fs_setattr, |
510 | #ifdef CONFIG_F2FS_FS_XATTR | |
511 | .setxattr = generic_setxattr, | |
512 | .getxattr = generic_getxattr, | |
513 | .listxattr = f2fs_listxattr, | |
514 | .removexattr = generic_removexattr, | |
515 | #endif | |
516 | }; | |
517 | ||
518 | const struct inode_operations f2fs_special_inode_operations = { | |
2d4d9fb5 | 519 | .getattr = f2fs_getattr, |
57397d86 JK |
520 | .setattr = f2fs_setattr, |
521 | .get_acl = f2fs_get_acl, | |
522 | #ifdef CONFIG_F2FS_FS_XATTR | |
523 | .setxattr = generic_setxattr, | |
524 | .getxattr = generic_getxattr, | |
525 | .listxattr = f2fs_listxattr, | |
526 | .removexattr = generic_removexattr, | |
527 | #endif | |
528 | }; |