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