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TOMOYO Linux Cross Reference
Linux/fs/f2fs/namei.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * fs/f2fs/namei.c
  4  *
  5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
  6  *             http://www.samsung.com/
  7  */
  8 #include <linux/fs.h>
  9 #include <linux/f2fs_fs.h>
 10 #include <linux/pagemap.h>
 11 #include <linux/sched.h>
 12 #include <linux/ctype.h>
 13 #include <linux/random.h>
 14 #include <linux/dcache.h>
 15 #include <linux/namei.h>
 16 #include <linux/quotaops.h>
 17 
 18 #include "f2fs.h"
 19 #include "node.h"
 20 #include "segment.h"
 21 #include "xattr.h"
 22 #include "acl.h"
 23 #include <trace/events/f2fs.h>
 24 
 25 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
 26 {
 27         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 28         nid_t ino;
 29         struct inode *inode;
 30         bool nid_free = false;
 31         int xattr_size = 0;
 32         int err;
 33 
 34         inode = new_inode(dir->i_sb);
 35         if (!inode)
 36                 return ERR_PTR(-ENOMEM);
 37 
 38         f2fs_lock_op(sbi);
 39         if (!f2fs_alloc_nid(sbi, &ino)) {
 40                 f2fs_unlock_op(sbi);
 41                 err = -ENOSPC;
 42                 goto fail;
 43         }
 44         f2fs_unlock_op(sbi);
 45 
 46         nid_free = true;
 47 
 48         inode_init_owner(inode, dir, mode);
 49 
 50         inode->i_ino = ino;
 51         inode->i_blocks = 0;
 52         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
 53         F2FS_I(inode)->i_crtime = inode->i_mtime;
 54         inode->i_generation = prandom_u32();
 55 
 56         if (S_ISDIR(inode->i_mode))
 57                 F2FS_I(inode)->i_current_depth = 1;
 58 
 59         err = insert_inode_locked(inode);
 60         if (err) {
 61                 err = -EINVAL;
 62                 goto fail;
 63         }
 64 
 65         if (f2fs_sb_has_project_quota(sbi) &&
 66                 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
 67                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
 68         else
 69                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
 70                                                         F2FS_DEF_PROJID);
 71 
 72         err = dquot_initialize(inode);
 73         if (err)
 74                 goto fail_drop;
 75 
 76         set_inode_flag(inode, FI_NEW_INODE);
 77 
 78         /* If the directory encrypted, then we should encrypt the inode. */
 79         if ((IS_ENCRYPTED(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
 80                                 f2fs_may_encrypt(inode))
 81                 f2fs_set_encrypted_inode(inode);
 82 
 83         if (f2fs_sb_has_extra_attr(sbi)) {
 84                 set_inode_flag(inode, FI_EXTRA_ATTR);
 85                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
 86         }
 87 
 88         if (test_opt(sbi, INLINE_XATTR))
 89                 set_inode_flag(inode, FI_INLINE_XATTR);
 90 
 91         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
 92                 set_inode_flag(inode, FI_INLINE_DATA);
 93         if (f2fs_may_inline_dentry(inode))
 94                 set_inode_flag(inode, FI_INLINE_DENTRY);
 95 
 96         if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
 97                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
 98                 if (f2fs_has_inline_xattr(inode))
 99                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
100                 /* Otherwise, will be 0 */
101         } else if (f2fs_has_inline_xattr(inode) ||
102                                 f2fs_has_inline_dentry(inode)) {
103                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
104         }
105         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
106 
107         f2fs_init_extent_tree(inode, NULL);
108 
109         stat_inc_inline_xattr(inode);
110         stat_inc_inline_inode(inode);
111         stat_inc_inline_dir(inode);
112 
113         F2FS_I(inode)->i_flags =
114                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
115 
116         if (S_ISDIR(inode->i_mode))
117                 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
118 
119         if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
120                 set_inode_flag(inode, FI_PROJ_INHERIT);
121 
122         f2fs_set_inode_flags(inode);
123 
124         trace_f2fs_new_inode(inode, 0);
125         return inode;
126 
127 fail:
128         trace_f2fs_new_inode(inode, err);
129         make_bad_inode(inode);
130         if (nid_free)
131                 set_inode_flag(inode, FI_FREE_NID);
132         iput(inode);
133         return ERR_PTR(err);
134 fail_drop:
135         trace_f2fs_new_inode(inode, err);
136         dquot_drop(inode);
137         inode->i_flags |= S_NOQUOTA;
138         if (nid_free)
139                 set_inode_flag(inode, FI_FREE_NID);
140         clear_nlink(inode);
141         unlock_new_inode(inode);
142         iput(inode);
143         return ERR_PTR(err);
144 }
145 
146 static inline int is_extension_exist(const unsigned char *s, const char *sub)
147 {
148         size_t slen = strlen(s);
149         size_t sublen = strlen(sub);
150         int i;
151 
152         /*
153          * filename format of multimedia file should be defined as:
154          * "filename + '.' + extension + (optional: '.' + temp extension)".
155          */
156         if (slen < sublen + 2)
157                 return 0;
158 
159         for (i = 1; i < slen - sublen; i++) {
160                 if (s[i] != '.')
161                         continue;
162                 if (!strncasecmp(s + i + 1, sub, sublen))
163                         return 1;
164         }
165 
166         return 0;
167 }
168 
169 /*
170  * Set multimedia files as cold files for hot/cold data separation
171  */
172 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
173                 const unsigned char *name)
174 {
175         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
176         int i, cold_count, hot_count;
177 
178         down_read(&sbi->sb_lock);
179 
180         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
181         hot_count = sbi->raw_super->hot_ext_count;
182 
183         for (i = 0; i < cold_count + hot_count; i++) {
184                 if (is_extension_exist(name, extlist[i]))
185                         break;
186         }
187 
188         up_read(&sbi->sb_lock);
189 
190         if (i == cold_count + hot_count)
191                 return;
192 
193         if (i < cold_count)
194                 file_set_cold(inode);
195         else
196                 file_set_hot(inode);
197 }
198 
199 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
200                                                         bool hot, bool set)
201 {
202         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
203         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
204         int hot_count = sbi->raw_super->hot_ext_count;
205         int total_count = cold_count + hot_count;
206         int start, count;
207         int i;
208 
209         if (set) {
210                 if (total_count == F2FS_MAX_EXTENSION)
211                         return -EINVAL;
212         } else {
213                 if (!hot && !cold_count)
214                         return -EINVAL;
215                 if (hot && !hot_count)
216                         return -EINVAL;
217         }
218 
219         if (hot) {
220                 start = cold_count;
221                 count = total_count;
222         } else {
223                 start = 0;
224                 count = cold_count;
225         }
226 
227         for (i = start; i < count; i++) {
228                 if (strcmp(name, extlist[i]))
229                         continue;
230 
231                 if (set)
232                         return -EINVAL;
233 
234                 memcpy(extlist[i], extlist[i + 1],
235                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
236                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
237                 if (hot)
238                         sbi->raw_super->hot_ext_count = hot_count - 1;
239                 else
240                         sbi->raw_super->extension_count =
241                                                 cpu_to_le32(cold_count - 1);
242                 return 0;
243         }
244 
245         if (!set)
246                 return -EINVAL;
247 
248         if (hot) {
249                 memcpy(extlist[count], name, strlen(name));
250                 sbi->raw_super->hot_ext_count = hot_count + 1;
251         } else {
252                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
253 
254                 memcpy(buf, &extlist[cold_count],
255                                 F2FS_EXTENSION_LEN * hot_count);
256                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
257                 memcpy(extlist[cold_count], name, strlen(name));
258                 memcpy(&extlist[cold_count + 1], buf,
259                                 F2FS_EXTENSION_LEN * hot_count);
260                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
261         }
262         return 0;
263 }
264 
265 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
266                                                 bool excl)
267 {
268         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
269         struct inode *inode;
270         nid_t ino = 0;
271         int err;
272 
273         if (unlikely(f2fs_cp_error(sbi)))
274                 return -EIO;
275         if (!f2fs_is_checkpoint_ready(sbi))
276                 return -ENOSPC;
277 
278         err = dquot_initialize(dir);
279         if (err)
280                 return err;
281 
282         inode = f2fs_new_inode(dir, mode);
283         if (IS_ERR(inode))
284                 return PTR_ERR(inode);
285 
286         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
287                 set_file_temperature(sbi, inode, dentry->d_name.name);
288 
289         inode->i_op = &f2fs_file_inode_operations;
290         inode->i_fop = &f2fs_file_operations;
291         inode->i_mapping->a_ops = &f2fs_dblock_aops;
292         ino = inode->i_ino;
293 
294         f2fs_lock_op(sbi);
295         err = f2fs_add_link(dentry, inode);
296         if (err)
297                 goto out;
298         f2fs_unlock_op(sbi);
299 
300         f2fs_alloc_nid_done(sbi, ino);
301 
302         d_instantiate_new(dentry, inode);
303 
304         if (IS_DIRSYNC(dir))
305                 f2fs_sync_fs(sbi->sb, 1);
306 
307         f2fs_balance_fs(sbi, true);
308         return 0;
309 out:
310         f2fs_handle_failed_inode(inode);
311         return err;
312 }
313 
314 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
315                 struct dentry *dentry)
316 {
317         struct inode *inode = d_inode(old_dentry);
318         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
319         int err;
320 
321         if (unlikely(f2fs_cp_error(sbi)))
322                 return -EIO;
323         if (!f2fs_is_checkpoint_ready(sbi))
324                 return -ENOSPC;
325 
326         err = fscrypt_prepare_link(old_dentry, dir, dentry);
327         if (err)
328                 return err;
329 
330         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
331                         (!projid_eq(F2FS_I(dir)->i_projid,
332                         F2FS_I(old_dentry->d_inode)->i_projid)))
333                 return -EXDEV;
334 
335         err = dquot_initialize(dir);
336         if (err)
337                 return err;
338 
339         f2fs_balance_fs(sbi, true);
340 
341         inode->i_ctime = current_time(inode);
342         ihold(inode);
343 
344         set_inode_flag(inode, FI_INC_LINK);
345         f2fs_lock_op(sbi);
346         err = f2fs_add_link(dentry, inode);
347         if (err)
348                 goto out;
349         f2fs_unlock_op(sbi);
350 
351         d_instantiate(dentry, inode);
352 
353         if (IS_DIRSYNC(dir))
354                 f2fs_sync_fs(sbi->sb, 1);
355         return 0;
356 out:
357         clear_inode_flag(inode, FI_INC_LINK);
358         iput(inode);
359         f2fs_unlock_op(sbi);
360         return err;
361 }
362 
363 struct dentry *f2fs_get_parent(struct dentry *child)
364 {
365         struct qstr dotdot = QSTR_INIT("..", 2);
366         struct page *page;
367         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
368         if (!ino) {
369                 if (IS_ERR(page))
370                         return ERR_CAST(page);
371                 return ERR_PTR(-ENOENT);
372         }
373         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
374 }
375 
376 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
377 {
378         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
379         struct qstr dot = QSTR_INIT(".", 1);
380         struct qstr dotdot = QSTR_INIT("..", 2);
381         struct f2fs_dir_entry *de;
382         struct page *page;
383         int err = 0;
384 
385         if (f2fs_readonly(sbi->sb)) {
386                 f2fs_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint",
387                           dir->i_ino, pino);
388                 return 0;
389         }
390 
391         err = dquot_initialize(dir);
392         if (err)
393                 return err;
394 
395         f2fs_balance_fs(sbi, true);
396 
397         f2fs_lock_op(sbi);
398 
399         de = f2fs_find_entry(dir, &dot, &page);
400         if (de) {
401                 f2fs_put_page(page, 0);
402         } else if (IS_ERR(page)) {
403                 err = PTR_ERR(page);
404                 goto out;
405         } else {
406                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
407                 if (err)
408                         goto out;
409         }
410 
411         de = f2fs_find_entry(dir, &dotdot, &page);
412         if (de)
413                 f2fs_put_page(page, 0);
414         else if (IS_ERR(page))
415                 err = PTR_ERR(page);
416         else
417                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
418 out:
419         if (!err)
420                 clear_inode_flag(dir, FI_INLINE_DOTS);
421 
422         f2fs_unlock_op(sbi);
423         return err;
424 }
425 
426 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
427                 unsigned int flags)
428 {
429         struct inode *inode = NULL;
430         struct f2fs_dir_entry *de;
431         struct page *page;
432         struct dentry *new;
433         nid_t ino = -1;
434         int err = 0;
435         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
436         struct fscrypt_name fname;
437 
438         trace_f2fs_lookup_start(dir, dentry, flags);
439 
440         if (dentry->d_name.len > F2FS_NAME_LEN) {
441                 err = -ENAMETOOLONG;
442                 goto out;
443         }
444 
445         err = fscrypt_prepare_lookup(dir, dentry, &fname);
446         if (err == -ENOENT)
447                 goto out_splice;
448         if (err)
449                 goto out;
450         de = __f2fs_find_entry(dir, &fname, &page);
451         fscrypt_free_filename(&fname);
452 
453         if (!de) {
454                 if (IS_ERR(page)) {
455                         err = PTR_ERR(page);
456                         goto out;
457                 }
458                 goto out_splice;
459         }
460 
461         ino = le32_to_cpu(de->ino);
462         f2fs_put_page(page, 0);
463 
464         inode = f2fs_iget(dir->i_sb, ino);
465         if (IS_ERR(inode)) {
466                 err = PTR_ERR(inode);
467                 goto out;
468         }
469 
470         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
471                 err = __recover_dot_dentries(dir, root_ino);
472                 if (err)
473                         goto out_iput;
474         }
475 
476         if (f2fs_has_inline_dots(inode)) {
477                 err = __recover_dot_dentries(inode, dir->i_ino);
478                 if (err)
479                         goto out_iput;
480         }
481         if (IS_ENCRYPTED(dir) &&
482             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
483             !fscrypt_has_permitted_context(dir, inode)) {
484                 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
485                           dir->i_ino, inode->i_ino);
486                 err = -EPERM;
487                 goto out_iput;
488         }
489 out_splice:
490 #ifdef CONFIG_UNICODE
491         if (!inode && IS_CASEFOLDED(dir)) {
492                 /* Eventually we want to call d_add_ci(dentry, NULL)
493                  * for negative dentries in the encoding case as
494                  * well.  For now, prevent the negative dentry
495                  * from being cached.
496                  */
497                 trace_f2fs_lookup_end(dir, dentry, ino, err);
498                 return NULL;
499         }
500 #endif
501         new = d_splice_alias(inode, dentry);
502         err = PTR_ERR_OR_ZERO(new);
503         trace_f2fs_lookup_end(dir, dentry, ino, err);
504         return new;
505 out_iput:
506         iput(inode);
507 out:
508         trace_f2fs_lookup_end(dir, dentry, ino, err);
509         return ERR_PTR(err);
510 }
511 
512 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
513 {
514         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
515         struct inode *inode = d_inode(dentry);
516         struct f2fs_dir_entry *de;
517         struct page *page;
518         int err = -ENOENT;
519 
520         trace_f2fs_unlink_enter(dir, dentry);
521 
522         if (unlikely(f2fs_cp_error(sbi)))
523                 return -EIO;
524 
525         err = dquot_initialize(dir);
526         if (err)
527                 return err;
528         err = dquot_initialize(inode);
529         if (err)
530                 return err;
531 
532         de = f2fs_find_entry(dir, &dentry->d_name, &page);
533         if (!de) {
534                 if (IS_ERR(page))
535                         err = PTR_ERR(page);
536                 goto fail;
537         }
538 
539         f2fs_balance_fs(sbi, true);
540 
541         f2fs_lock_op(sbi);
542         err = f2fs_acquire_orphan_inode(sbi);
543         if (err) {
544                 f2fs_unlock_op(sbi);
545                 f2fs_put_page(page, 0);
546                 goto fail;
547         }
548         f2fs_delete_entry(de, page, dir, inode);
549 #ifdef CONFIG_UNICODE
550         /* VFS negative dentries are incompatible with Encoding and
551          * Case-insensitiveness. Eventually we'll want avoid
552          * invalidating the dentries here, alongside with returning the
553          * negative dentries at f2fs_lookup(), when it is  better
554          * supported by the VFS for the CI case.
555          */
556         if (IS_CASEFOLDED(dir))
557                 d_invalidate(dentry);
558 #endif
559         f2fs_unlock_op(sbi);
560 
561         if (IS_DIRSYNC(dir))
562                 f2fs_sync_fs(sbi->sb, 1);
563 fail:
564         trace_f2fs_unlink_exit(inode, err);
565         return err;
566 }
567 
568 static const char *f2fs_get_link(struct dentry *dentry,
569                                  struct inode *inode,
570                                  struct delayed_call *done)
571 {
572         const char *link = page_get_link(dentry, inode, done);
573         if (!IS_ERR(link) && !*link) {
574                 /* this is broken symlink case */
575                 do_delayed_call(done);
576                 clear_delayed_call(done);
577                 link = ERR_PTR(-ENOENT);
578         }
579         return link;
580 }
581 
582 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
583                                         const char *symname)
584 {
585         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
586         struct inode *inode;
587         size_t len = strlen(symname);
588         struct fscrypt_str disk_link;
589         int err;
590 
591         if (unlikely(f2fs_cp_error(sbi)))
592                 return -EIO;
593         if (!f2fs_is_checkpoint_ready(sbi))
594                 return -ENOSPC;
595 
596         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
597                                       &disk_link);
598         if (err)
599                 return err;
600 
601         err = dquot_initialize(dir);
602         if (err)
603                 return err;
604 
605         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
606         if (IS_ERR(inode))
607                 return PTR_ERR(inode);
608 
609         if (IS_ENCRYPTED(inode))
610                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
611         else
612                 inode->i_op = &f2fs_symlink_inode_operations;
613         inode_nohighmem(inode);
614         inode->i_mapping->a_ops = &f2fs_dblock_aops;
615 
616         f2fs_lock_op(sbi);
617         err = f2fs_add_link(dentry, inode);
618         if (err)
619                 goto out_f2fs_handle_failed_inode;
620         f2fs_unlock_op(sbi);
621         f2fs_alloc_nid_done(sbi, inode->i_ino);
622 
623         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
624         if (err)
625                 goto err_out;
626 
627         err = page_symlink(inode, disk_link.name, disk_link.len);
628 
629 err_out:
630         d_instantiate_new(dentry, inode);
631 
632         /*
633          * Let's flush symlink data in order to avoid broken symlink as much as
634          * possible. Nevertheless, fsyncing is the best way, but there is no
635          * way to get a file descriptor in order to flush that.
636          *
637          * Note that, it needs to do dir->fsync to make this recoverable.
638          * If the symlink path is stored into inline_data, there is no
639          * performance regression.
640          */
641         if (!err) {
642                 filemap_write_and_wait_range(inode->i_mapping, 0,
643                                                         disk_link.len - 1);
644 
645                 if (IS_DIRSYNC(dir))
646                         f2fs_sync_fs(sbi->sb, 1);
647         } else {
648                 f2fs_unlink(dir, dentry);
649         }
650 
651         f2fs_balance_fs(sbi, true);
652         goto out_free_encrypted_link;
653 
654 out_f2fs_handle_failed_inode:
655         f2fs_handle_failed_inode(inode);
656 out_free_encrypted_link:
657         if (disk_link.name != (unsigned char *)symname)
658                 kvfree(disk_link.name);
659         return err;
660 }
661 
662 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
663 {
664         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
665         struct inode *inode;
666         int err;
667 
668         if (unlikely(f2fs_cp_error(sbi)))
669                 return -EIO;
670 
671         err = dquot_initialize(dir);
672         if (err)
673                 return err;
674 
675         inode = f2fs_new_inode(dir, S_IFDIR | mode);
676         if (IS_ERR(inode))
677                 return PTR_ERR(inode);
678 
679         inode->i_op = &f2fs_dir_inode_operations;
680         inode->i_fop = &f2fs_dir_operations;
681         inode->i_mapping->a_ops = &f2fs_dblock_aops;
682         inode_nohighmem(inode);
683 
684         set_inode_flag(inode, FI_INC_LINK);
685         f2fs_lock_op(sbi);
686         err = f2fs_add_link(dentry, inode);
687         if (err)
688                 goto out_fail;
689         f2fs_unlock_op(sbi);
690 
691         f2fs_alloc_nid_done(sbi, inode->i_ino);
692 
693         d_instantiate_new(dentry, inode);
694 
695         if (IS_DIRSYNC(dir))
696                 f2fs_sync_fs(sbi->sb, 1);
697 
698         f2fs_balance_fs(sbi, true);
699         return 0;
700 
701 out_fail:
702         clear_inode_flag(inode, FI_INC_LINK);
703         f2fs_handle_failed_inode(inode);
704         return err;
705 }
706 
707 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
708 {
709         struct inode *inode = d_inode(dentry);
710         if (f2fs_empty_dir(inode))
711                 return f2fs_unlink(dir, dentry);
712         return -ENOTEMPTY;
713 }
714 
715 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
716                                 umode_t mode, dev_t rdev)
717 {
718         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
719         struct inode *inode;
720         int err = 0;
721 
722         if (unlikely(f2fs_cp_error(sbi)))
723                 return -EIO;
724         if (!f2fs_is_checkpoint_ready(sbi))
725                 return -ENOSPC;
726 
727         err = dquot_initialize(dir);
728         if (err)
729                 return err;
730 
731         inode = f2fs_new_inode(dir, mode);
732         if (IS_ERR(inode))
733                 return PTR_ERR(inode);
734 
735         init_special_inode(inode, inode->i_mode, rdev);
736         inode->i_op = &f2fs_special_inode_operations;
737 
738         f2fs_lock_op(sbi);
739         err = f2fs_add_link(dentry, inode);
740         if (err)
741                 goto out;
742         f2fs_unlock_op(sbi);
743 
744         f2fs_alloc_nid_done(sbi, inode->i_ino);
745 
746         d_instantiate_new(dentry, inode);
747 
748         if (IS_DIRSYNC(dir))
749                 f2fs_sync_fs(sbi->sb, 1);
750 
751         f2fs_balance_fs(sbi, true);
752         return 0;
753 out:
754         f2fs_handle_failed_inode(inode);
755         return err;
756 }
757 
758 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
759                                         umode_t mode, struct inode **whiteout)
760 {
761         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
762         struct inode *inode;
763         int err;
764 
765         err = dquot_initialize(dir);
766         if (err)
767                 return err;
768 
769         inode = f2fs_new_inode(dir, mode);
770         if (IS_ERR(inode))
771                 return PTR_ERR(inode);
772 
773         if (whiteout) {
774                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
775                 inode->i_op = &f2fs_special_inode_operations;
776         } else {
777                 inode->i_op = &f2fs_file_inode_operations;
778                 inode->i_fop = &f2fs_file_operations;
779                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
780         }
781 
782         f2fs_lock_op(sbi);
783         err = f2fs_acquire_orphan_inode(sbi);
784         if (err)
785                 goto out;
786 
787         err = f2fs_do_tmpfile(inode, dir);
788         if (err)
789                 goto release_out;
790 
791         /*
792          * add this non-linked tmpfile to orphan list, in this way we could
793          * remove all unused data of tmpfile after abnormal power-off.
794          */
795         f2fs_add_orphan_inode(inode);
796         f2fs_alloc_nid_done(sbi, inode->i_ino);
797 
798         if (whiteout) {
799                 f2fs_i_links_write(inode, false);
800                 *whiteout = inode;
801         } else {
802                 d_tmpfile(dentry, inode);
803         }
804         /* link_count was changed by d_tmpfile as well. */
805         f2fs_unlock_op(sbi);
806         unlock_new_inode(inode);
807 
808         f2fs_balance_fs(sbi, true);
809         return 0;
810 
811 release_out:
812         f2fs_release_orphan_inode(sbi);
813 out:
814         f2fs_handle_failed_inode(inode);
815         return err;
816 }
817 
818 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
819 {
820         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
821 
822         if (unlikely(f2fs_cp_error(sbi)))
823                 return -EIO;
824         if (!f2fs_is_checkpoint_ready(sbi))
825                 return -ENOSPC;
826 
827         if (IS_ENCRYPTED(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
828                 int err = fscrypt_get_encryption_info(dir);
829                 if (err)
830                         return err;
831         }
832 
833         return __f2fs_tmpfile(dir, dentry, mode, NULL);
834 }
835 
836 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
837 {
838         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
839                 return -EIO;
840 
841         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
842 }
843 
844 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
845                         struct inode *new_dir, struct dentry *new_dentry,
846                         unsigned int flags)
847 {
848         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
849         struct inode *old_inode = d_inode(old_dentry);
850         struct inode *new_inode = d_inode(new_dentry);
851         struct inode *whiteout = NULL;
852         struct page *old_dir_page;
853         struct page *old_page, *new_page = NULL;
854         struct f2fs_dir_entry *old_dir_entry = NULL;
855         struct f2fs_dir_entry *old_entry;
856         struct f2fs_dir_entry *new_entry;
857         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
858         int err;
859 
860         if (unlikely(f2fs_cp_error(sbi)))
861                 return -EIO;
862         if (!f2fs_is_checkpoint_ready(sbi))
863                 return -ENOSPC;
864 
865         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
866                         (!projid_eq(F2FS_I(new_dir)->i_projid,
867                         F2FS_I(old_dentry->d_inode)->i_projid)))
868                 return -EXDEV;
869 
870         err = dquot_initialize(old_dir);
871         if (err)
872                 goto out;
873 
874         err = dquot_initialize(new_dir);
875         if (err)
876                 goto out;
877 
878         if (new_inode) {
879                 err = dquot_initialize(new_inode);
880                 if (err)
881                         goto out;
882         }
883 
884         err = -ENOENT;
885         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
886         if (!old_entry) {
887                 if (IS_ERR(old_page))
888                         err = PTR_ERR(old_page);
889                 goto out;
890         }
891 
892         if (S_ISDIR(old_inode->i_mode)) {
893                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
894                 if (!old_dir_entry) {
895                         if (IS_ERR(old_dir_page))
896                                 err = PTR_ERR(old_dir_page);
897                         goto out_old;
898                 }
899         }
900 
901         if (flags & RENAME_WHITEOUT) {
902                 err = f2fs_create_whiteout(old_dir, &whiteout);
903                 if (err)
904                         goto out_dir;
905         }
906 
907         if (new_inode) {
908 
909                 err = -ENOTEMPTY;
910                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
911                         goto out_whiteout;
912 
913                 err = -ENOENT;
914                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
915                                                 &new_page);
916                 if (!new_entry) {
917                         if (IS_ERR(new_page))
918                                 err = PTR_ERR(new_page);
919                         goto out_whiteout;
920                 }
921 
922                 f2fs_balance_fs(sbi, true);
923 
924                 f2fs_lock_op(sbi);
925 
926                 err = f2fs_acquire_orphan_inode(sbi);
927                 if (err)
928                         goto put_out_dir;
929 
930                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
931 
932                 new_inode->i_ctime = current_time(new_inode);
933                 down_write(&F2FS_I(new_inode)->i_sem);
934                 if (old_dir_entry)
935                         f2fs_i_links_write(new_inode, false);
936                 f2fs_i_links_write(new_inode, false);
937                 up_write(&F2FS_I(new_inode)->i_sem);
938 
939                 if (!new_inode->i_nlink)
940                         f2fs_add_orphan_inode(new_inode);
941                 else
942                         f2fs_release_orphan_inode(sbi);
943         } else {
944                 f2fs_balance_fs(sbi, true);
945 
946                 f2fs_lock_op(sbi);
947 
948                 err = f2fs_add_link(new_dentry, old_inode);
949                 if (err) {
950                         f2fs_unlock_op(sbi);
951                         goto out_whiteout;
952                 }
953 
954                 if (old_dir_entry)
955                         f2fs_i_links_write(new_dir, true);
956 
957                 /*
958                  * old entry and new entry can locate in the same inline
959                  * dentry in inode, when attaching new entry in inline dentry,
960                  * it could force inline dentry conversion, after that,
961                  * old_entry and old_page will point to wrong address, in
962                  * order to avoid this, let's do the check and update here.
963                  */
964                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
965                         f2fs_put_page(old_page, 0);
966                         old_page = NULL;
967 
968                         old_entry = f2fs_find_entry(old_dir,
969                                                 &old_dentry->d_name, &old_page);
970                         if (!old_entry) {
971                                 err = -ENOENT;
972                                 if (IS_ERR(old_page))
973                                         err = PTR_ERR(old_page);
974                                 f2fs_unlock_op(sbi);
975                                 goto out_whiteout;
976                         }
977                 }
978         }
979 
980         down_write(&F2FS_I(old_inode)->i_sem);
981         if (!old_dir_entry || whiteout)
982                 file_lost_pino(old_inode);
983         else
984                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
985         up_write(&F2FS_I(old_inode)->i_sem);
986 
987         old_inode->i_ctime = current_time(old_inode);
988         f2fs_mark_inode_dirty_sync(old_inode, false);
989 
990         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
991 
992         if (whiteout) {
993                 whiteout->i_state |= I_LINKABLE;
994                 set_inode_flag(whiteout, FI_INC_LINK);
995                 err = f2fs_add_link(old_dentry, whiteout);
996                 if (err)
997                         goto put_out_dir;
998                 whiteout->i_state &= ~I_LINKABLE;
999                 iput(whiteout);
1000         }
1001 
1002         if (old_dir_entry) {
1003                 if (old_dir != new_dir && !whiteout)
1004                         f2fs_set_link(old_inode, old_dir_entry,
1005                                                 old_dir_page, new_dir);
1006                 else
1007                         f2fs_put_page(old_dir_page, 0);
1008                 f2fs_i_links_write(old_dir, false);
1009         }
1010         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1011                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1012                 if (S_ISDIR(old_inode->i_mode))
1013                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
1014                                                         TRANS_DIR_INO);
1015         }
1016 
1017         f2fs_unlock_op(sbi);
1018 
1019         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1020                 f2fs_sync_fs(sbi->sb, 1);
1021 
1022         f2fs_update_time(sbi, REQ_TIME);
1023         return 0;
1024 
1025 put_out_dir:
1026         f2fs_unlock_op(sbi);
1027         if (new_page)
1028                 f2fs_put_page(new_page, 0);
1029 out_whiteout:
1030         if (whiteout)
1031                 iput(whiteout);
1032 out_dir:
1033         if (old_dir_entry)
1034                 f2fs_put_page(old_dir_page, 0);
1035 out_old:
1036         f2fs_put_page(old_page, 0);
1037 out:
1038         return err;
1039 }
1040 
1041 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1042                              struct inode *new_dir, struct dentry *new_dentry)
1043 {
1044         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1045         struct inode *old_inode = d_inode(old_dentry);
1046         struct inode *new_inode = d_inode(new_dentry);
1047         struct page *old_dir_page, *new_dir_page;
1048         struct page *old_page, *new_page;
1049         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1050         struct f2fs_dir_entry *old_entry, *new_entry;
1051         int old_nlink = 0, new_nlink = 0;
1052         int err;
1053 
1054         if (unlikely(f2fs_cp_error(sbi)))
1055                 return -EIO;
1056         if (!f2fs_is_checkpoint_ready(sbi))
1057                 return -ENOSPC;
1058 
1059         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1060                         !projid_eq(F2FS_I(new_dir)->i_projid,
1061                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1062             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1063                         !projid_eq(F2FS_I(old_dir)->i_projid,
1064                         F2FS_I(new_dentry->d_inode)->i_projid)))
1065                 return -EXDEV;
1066 
1067         err = dquot_initialize(old_dir);
1068         if (err)
1069                 goto out;
1070 
1071         err = dquot_initialize(new_dir);
1072         if (err)
1073                 goto out;
1074 
1075         err = -ENOENT;
1076         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1077         if (!old_entry) {
1078                 if (IS_ERR(old_page))
1079                         err = PTR_ERR(old_page);
1080                 goto out;
1081         }
1082 
1083         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1084         if (!new_entry) {
1085                 if (IS_ERR(new_page))
1086                         err = PTR_ERR(new_page);
1087                 goto out_old;
1088         }
1089 
1090         /* prepare for updating ".." directory entry info later */
1091         if (old_dir != new_dir) {
1092                 if (S_ISDIR(old_inode->i_mode)) {
1093                         old_dir_entry = f2fs_parent_dir(old_inode,
1094                                                         &old_dir_page);
1095                         if (!old_dir_entry) {
1096                                 if (IS_ERR(old_dir_page))
1097                                         err = PTR_ERR(old_dir_page);
1098                                 goto out_new;
1099                         }
1100                 }
1101 
1102                 if (S_ISDIR(new_inode->i_mode)) {
1103                         new_dir_entry = f2fs_parent_dir(new_inode,
1104                                                         &new_dir_page);
1105                         if (!new_dir_entry) {
1106                                 if (IS_ERR(new_dir_page))
1107                                         err = PTR_ERR(new_dir_page);
1108                                 goto out_old_dir;
1109                         }
1110                 }
1111         }
1112 
1113         /*
1114          * If cross rename between file and directory those are not
1115          * in the same directory, we will inc nlink of file's parent
1116          * later, so we should check upper boundary of its nlink.
1117          */
1118         if ((!old_dir_entry || !new_dir_entry) &&
1119                                 old_dir_entry != new_dir_entry) {
1120                 old_nlink = old_dir_entry ? -1 : 1;
1121                 new_nlink = -old_nlink;
1122                 err = -EMLINK;
1123                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1124                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1125                         goto out_new_dir;
1126         }
1127 
1128         f2fs_balance_fs(sbi, true);
1129 
1130         f2fs_lock_op(sbi);
1131 
1132         /* update ".." directory entry info of old dentry */
1133         if (old_dir_entry)
1134                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1135 
1136         /* update ".." directory entry info of new dentry */
1137         if (new_dir_entry)
1138                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1139 
1140         /* update directory entry info of old dir inode */
1141         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1142 
1143         down_write(&F2FS_I(old_inode)->i_sem);
1144         file_lost_pino(old_inode);
1145         up_write(&F2FS_I(old_inode)->i_sem);
1146 
1147         old_dir->i_ctime = current_time(old_dir);
1148         if (old_nlink) {
1149                 down_write(&F2FS_I(old_dir)->i_sem);
1150                 f2fs_i_links_write(old_dir, old_nlink > 0);
1151                 up_write(&F2FS_I(old_dir)->i_sem);
1152         }
1153         f2fs_mark_inode_dirty_sync(old_dir, false);
1154 
1155         /* update directory entry info of new dir inode */
1156         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1157 
1158         down_write(&F2FS_I(new_inode)->i_sem);
1159         file_lost_pino(new_inode);
1160         up_write(&F2FS_I(new_inode)->i_sem);
1161 
1162         new_dir->i_ctime = current_time(new_dir);
1163         if (new_nlink) {
1164                 down_write(&F2FS_I(new_dir)->i_sem);
1165                 f2fs_i_links_write(new_dir, new_nlink > 0);
1166                 up_write(&F2FS_I(new_dir)->i_sem);
1167         }
1168         f2fs_mark_inode_dirty_sync(new_dir, false);
1169 
1170         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1171                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1172                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1173         }
1174 
1175         f2fs_unlock_op(sbi);
1176 
1177         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1178                 f2fs_sync_fs(sbi->sb, 1);
1179 
1180         f2fs_update_time(sbi, REQ_TIME);
1181         return 0;
1182 out_new_dir:
1183         if (new_dir_entry) {
1184                 f2fs_put_page(new_dir_page, 0);
1185         }
1186 out_old_dir:
1187         if (old_dir_entry) {
1188                 f2fs_put_page(old_dir_page, 0);
1189         }
1190 out_new:
1191         f2fs_put_page(new_page, 0);
1192 out_old:
1193         f2fs_put_page(old_page, 0);
1194 out:
1195         return err;
1196 }
1197 
1198 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1199                         struct inode *new_dir, struct dentry *new_dentry,
1200                         unsigned int flags)
1201 {
1202         int err;
1203 
1204         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1205                 return -EINVAL;
1206 
1207         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1208                                      flags);
1209         if (err)
1210                 return err;
1211 
1212         if (flags & RENAME_EXCHANGE) {
1213                 return f2fs_cross_rename(old_dir, old_dentry,
1214                                          new_dir, new_dentry);
1215         }
1216         /*
1217          * VFS has already handled the new dentry existence case,
1218          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1219          */
1220         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1221 }
1222 
1223 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1224                                            struct inode *inode,
1225                                            struct delayed_call *done)
1226 {
1227         struct page *page;
1228         const char *target;
1229 
1230         if (!dentry)
1231                 return ERR_PTR(-ECHILD);
1232 
1233         page = read_mapping_page(inode->i_mapping, 0, NULL);
1234         if (IS_ERR(page))
1235                 return ERR_CAST(page);
1236 
1237         target = fscrypt_get_symlink(inode, page_address(page),
1238                                      inode->i_sb->s_blocksize, done);
1239         put_page(page);
1240         return target;
1241 }
1242 
1243 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1244         .get_link       = f2fs_encrypted_get_link,
1245         .getattr        = f2fs_getattr,
1246         .setattr        = f2fs_setattr,
1247 #ifdef CONFIG_F2FS_FS_XATTR
1248         .listxattr      = f2fs_listxattr,
1249 #endif
1250 };
1251 
1252 const struct inode_operations f2fs_dir_inode_operations = {
1253         .create         = f2fs_create,
1254         .lookup         = f2fs_lookup,
1255         .link           = f2fs_link,
1256         .unlink         = f2fs_unlink,
1257         .symlink        = f2fs_symlink,
1258         .mkdir          = f2fs_mkdir,
1259         .rmdir          = f2fs_rmdir,
1260         .mknod          = f2fs_mknod,
1261         .rename         = f2fs_rename2,
1262         .tmpfile        = f2fs_tmpfile,
1263         .getattr        = f2fs_getattr,
1264         .setattr        = f2fs_setattr,
1265         .get_acl        = f2fs_get_acl,
1266         .set_acl        = f2fs_set_acl,
1267 #ifdef CONFIG_F2FS_FS_XATTR
1268         .listxattr      = f2fs_listxattr,
1269 #endif
1270         .fiemap         = f2fs_fiemap,
1271 };
1272 
1273 const struct inode_operations f2fs_symlink_inode_operations = {
1274         .get_link       = f2fs_get_link,
1275         .getattr        = f2fs_getattr,
1276         .setattr        = f2fs_setattr,
1277 #ifdef CONFIG_F2FS_FS_XATTR
1278         .listxattr      = f2fs_listxattr,
1279 #endif
1280 };
1281 
1282 const struct inode_operations f2fs_special_inode_operations = {
1283         .getattr        = f2fs_getattr,
1284         .setattr        = f2fs_setattr,
1285         .get_acl        = f2fs_get_acl,
1286         .set_acl        = f2fs_set_acl,
1287 #ifdef CONFIG_F2FS_FS_XATTR
1288         .listxattr      = f2fs_listxattr,
1289 #endif
1290 };
1291 

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