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

Version: ~ [ linux-5.2 ] ~ [ linux-5.1.16 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.57 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.132 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.184 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.184 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.69 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #include <linux/dcache.h>
 17 #include <linux/namei.h>
 18 
 19 #include "f2fs.h"
 20 #include "node.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 err;
 32 
 33         inode = new_inode(dir->i_sb);
 34         if (!inode)
 35                 return ERR_PTR(-ENOMEM);
 36 
 37         f2fs_lock_op(sbi);
 38         if (!alloc_nid(sbi, &ino)) {
 39                 f2fs_unlock_op(sbi);
 40                 err = -ENOSPC;
 41                 goto fail;
 42         }
 43         f2fs_unlock_op(sbi);
 44 
 45         inode_init_owner(inode, dir, mode);
 46 
 47         inode->i_ino = ino;
 48         inode->i_blocks = 0;
 49         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 50         inode->i_generation = sbi->s_next_generation++;
 51 
 52         err = insert_inode_locked(inode);
 53         if (err) {
 54                 err = -EINVAL;
 55                 nid_free = true;
 56                 goto out;
 57         }
 58 
 59         if (f2fs_may_inline(inode))
 60                 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 61         if (test_opt(sbi, INLINE_DENTRY) && S_ISDIR(inode->i_mode))
 62                 set_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY);
 63 
 64         trace_f2fs_new_inode(inode, 0);
 65         mark_inode_dirty(inode);
 66         return inode;
 67 
 68 out:
 69         clear_nlink(inode);
 70         unlock_new_inode(inode);
 71 fail:
 72         trace_f2fs_new_inode(inode, err);
 73         make_bad_inode(inode);
 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 {
 82         size_t slen = strlen(s);
 83         size_t sublen = strlen(sub);
 84 
 85         if (sublen > slen)
 86                 return 0;
 87 
 88         return !strncasecmp(s + slen - sublen, sub, sublen);
 89 }
 90 
 91 /*
 92  * Set multimedia files as cold files for hot/cold data separation
 93  */
 94 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
 95                 const unsigned char *name)
 96 {
 97         int i;
 98         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
 99 
100         int count = le32_to_cpu(sbi->raw_super->extension_count);
101         for (i = 0; i < count; i++) {
102                 if (is_multimedia_file(name, extlist[i])) {
103                         file_set_cold(inode);
104                         break;
105                 }
106         }
107 }
108 
109 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
110                                                 bool excl)
111 {
112         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
113         struct inode *inode;
114         nid_t ino = 0;
115         int err;
116 
117         f2fs_balance_fs(sbi);
118 
119         inode = f2fs_new_inode(dir, mode);
120         if (IS_ERR(inode))
121                 return PTR_ERR(inode);
122 
123         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
124                 set_cold_files(sbi, inode, dentry->d_name.name);
125 
126         inode->i_op = &f2fs_file_inode_operations;
127         inode->i_fop = &f2fs_file_operations;
128         inode->i_mapping->a_ops = &f2fs_dblock_aops;
129         ino = inode->i_ino;
130 
131         f2fs_lock_op(sbi);
132         err = f2fs_add_link(dentry, inode);
133         if (err)
134                 goto out;
135         f2fs_unlock_op(sbi);
136 
137         alloc_nid_done(sbi, ino);
138 
139         stat_inc_inline_inode(inode);
140         d_instantiate(dentry, inode);
141         unlock_new_inode(inode);
142 
143         if (IS_DIRSYNC(dir))
144                 f2fs_sync_fs(sbi->sb, 1);
145         return 0;
146 out:
147         handle_failed_inode(inode);
148         return err;
149 }
150 
151 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
152                 struct dentry *dentry)
153 {
154         struct inode *inode = d_inode(old_dentry);
155         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
156         int err;
157 
158         f2fs_balance_fs(sbi);
159 
160         inode->i_ctime = CURRENT_TIME;
161         ihold(inode);
162 
163         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
164         f2fs_lock_op(sbi);
165         err = f2fs_add_link(dentry, inode);
166         if (err)
167                 goto out;
168         f2fs_unlock_op(sbi);
169 
170         d_instantiate(dentry, inode);
171 
172         if (IS_DIRSYNC(dir))
173                 f2fs_sync_fs(sbi->sb, 1);
174         return 0;
175 out:
176         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
177         iput(inode);
178         f2fs_unlock_op(sbi);
179         return err;
180 }
181 
182 struct dentry *f2fs_get_parent(struct dentry *child)
183 {
184         struct qstr dotdot = QSTR_INIT("..", 2);
185         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot);
186         if (!ino)
187                 return ERR_PTR(-ENOENT);
188         return d_obtain_alias(f2fs_iget(d_inode(child)->i_sb, ino));
189 }
190 
191 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
192 {
193         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
194         struct qstr dot = QSTR_INIT(".", 1);
195         struct qstr dotdot = QSTR_INIT("..", 2);
196         struct f2fs_dir_entry *de;
197         struct page *page;
198         int err = 0;
199 
200         f2fs_lock_op(sbi);
201 
202         de = f2fs_find_entry(dir, &dot, &page);
203         if (de) {
204                 f2fs_dentry_kunmap(dir, page);
205                 f2fs_put_page(page, 0);
206         } else {
207                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
208                 if (err)
209                         goto out;
210         }
211 
212         de = f2fs_find_entry(dir, &dotdot, &page);
213         if (de) {
214                 f2fs_dentry_kunmap(dir, page);
215                 f2fs_put_page(page, 0);
216         } else {
217                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
218         }
219 out:
220         if (!err) {
221                 clear_inode_flag(F2FS_I(dir), FI_INLINE_DOTS);
222                 mark_inode_dirty(dir);
223         }
224 
225         f2fs_unlock_op(sbi);
226         return err;
227 }
228 
229 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
230                 unsigned int flags)
231 {
232         struct inode *inode = NULL;
233         struct f2fs_dir_entry *de;
234         struct page *page;
235 
236         if (dentry->d_name.len > F2FS_NAME_LEN)
237                 return ERR_PTR(-ENAMETOOLONG);
238 
239         de = f2fs_find_entry(dir, &dentry->d_name, &page);
240         if (de) {
241                 nid_t ino = le32_to_cpu(de->ino);
242                 f2fs_dentry_kunmap(dir, page);
243                 f2fs_put_page(page, 0);
244 
245                 inode = f2fs_iget(dir->i_sb, ino);
246                 if (IS_ERR(inode))
247                         return ERR_CAST(inode);
248 
249                 if (f2fs_has_inline_dots(inode)) {
250                         int err;
251 
252                         err = __recover_dot_dentries(inode, dir->i_ino);
253                         if (err) {
254                                 iget_failed(inode);
255                                 return ERR_PTR(err);
256                         }
257                 }
258         }
259 
260         return d_splice_alias(inode, dentry);
261 }
262 
263 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
264 {
265         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
266         struct inode *inode = d_inode(dentry);
267         struct f2fs_dir_entry *de;
268         struct page *page;
269         int err = -ENOENT;
270 
271         trace_f2fs_unlink_enter(dir, dentry);
272         f2fs_balance_fs(sbi);
273 
274         de = f2fs_find_entry(dir, &dentry->d_name, &page);
275         if (!de)
276                 goto fail;
277 
278         f2fs_lock_op(sbi);
279         err = acquire_orphan_inode(sbi);
280         if (err) {
281                 f2fs_unlock_op(sbi);
282                 f2fs_dentry_kunmap(dir, page);
283                 f2fs_put_page(page, 0);
284                 goto fail;
285         }
286         f2fs_delete_entry(de, page, dir, inode);
287         f2fs_unlock_op(sbi);
288 
289         /* In order to evict this inode, we set it dirty */
290         mark_inode_dirty(inode);
291 
292         if (IS_DIRSYNC(dir))
293                 f2fs_sync_fs(sbi->sb, 1);
294 fail:
295         trace_f2fs_unlink_exit(inode, err);
296         return err;
297 }
298 
299 static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd)
300 {
301         struct page *page = page_follow_link_light(dentry, nd);
302 
303         if (IS_ERR_OR_NULL(page))
304                 return page;
305 
306         /* this is broken symlink case */
307         if (*nd_get_link(nd) == 0) {
308                 page_put_link(dentry, nd, page);
309                 return ERR_PTR(-ENOENT);
310         }
311         return page;
312 }
313 
314 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
315                                         const char *symname)
316 {
317         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
318         struct inode *inode;
319         size_t symlen = strlen(symname) + 1;
320         int err;
321 
322         f2fs_balance_fs(sbi);
323 
324         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
325         if (IS_ERR(inode))
326                 return PTR_ERR(inode);
327 
328         inode->i_op = &f2fs_symlink_inode_operations;
329         inode->i_mapping->a_ops = &f2fs_dblock_aops;
330 
331         f2fs_lock_op(sbi);
332         err = f2fs_add_link(dentry, inode);
333         if (err)
334                 goto out;
335         f2fs_unlock_op(sbi);
336 
337         err = page_symlink(inode, symname, symlen);
338         alloc_nid_done(sbi, inode->i_ino);
339 
340         d_instantiate(dentry, inode);
341         unlock_new_inode(inode);
342 
343         /*
344          * Let's flush symlink data in order to avoid broken symlink as much as
345          * possible. Nevertheless, fsyncing is the best way, but there is no
346          * way to get a file descriptor in order to flush that.
347          *
348          * Note that, it needs to do dir->fsync to make this recoverable.
349          * If the symlink path is stored into inline_data, there is no
350          * performance regression.
351          */
352         filemap_write_and_wait_range(inode->i_mapping, 0, symlen - 1);
353 
354         if (IS_DIRSYNC(dir))
355                 f2fs_sync_fs(sbi->sb, 1);
356         return err;
357 out:
358         handle_failed_inode(inode);
359         return err;
360 }
361 
362 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
363 {
364         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
365         struct inode *inode;
366         int err;
367 
368         f2fs_balance_fs(sbi);
369 
370         inode = f2fs_new_inode(dir, S_IFDIR | mode);
371         if (IS_ERR(inode))
372                 return PTR_ERR(inode);
373 
374         inode->i_op = &f2fs_dir_inode_operations;
375         inode->i_fop = &f2fs_dir_operations;
376         inode->i_mapping->a_ops = &f2fs_dblock_aops;
377         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
378 
379         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
380         f2fs_lock_op(sbi);
381         err = f2fs_add_link(dentry, inode);
382         if (err)
383                 goto out_fail;
384         f2fs_unlock_op(sbi);
385 
386         stat_inc_inline_dir(inode);
387         alloc_nid_done(sbi, inode->i_ino);
388 
389         d_instantiate(dentry, inode);
390         unlock_new_inode(inode);
391 
392         if (IS_DIRSYNC(dir))
393                 f2fs_sync_fs(sbi->sb, 1);
394         return 0;
395 
396 out_fail:
397         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
398         handle_failed_inode(inode);
399         return err;
400 }
401 
402 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
403 {
404         struct inode *inode = d_inode(dentry);
405         if (f2fs_empty_dir(inode))
406                 return f2fs_unlink(dir, dentry);
407         return -ENOTEMPTY;
408 }
409 
410 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
411                                 umode_t mode, dev_t rdev)
412 {
413         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
414         struct inode *inode;
415         int err = 0;
416 
417         if (!new_valid_dev(rdev))
418                 return -EINVAL;
419 
420         f2fs_balance_fs(sbi);
421 
422         inode = f2fs_new_inode(dir, mode);
423         if (IS_ERR(inode))
424                 return PTR_ERR(inode);
425 
426         init_special_inode(inode, inode->i_mode, rdev);
427         inode->i_op = &f2fs_special_inode_operations;
428 
429         f2fs_lock_op(sbi);
430         err = f2fs_add_link(dentry, inode);
431         if (err)
432                 goto out;
433         f2fs_unlock_op(sbi);
434 
435         alloc_nid_done(sbi, inode->i_ino);
436 
437         d_instantiate(dentry, inode);
438         unlock_new_inode(inode);
439 
440         if (IS_DIRSYNC(dir))
441                 f2fs_sync_fs(sbi->sb, 1);
442         return 0;
443 out:
444         handle_failed_inode(inode);
445         return err;
446 }
447 
448 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
449                         struct inode *new_dir, struct dentry *new_dentry)
450 {
451         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
452         struct inode *old_inode = d_inode(old_dentry);
453         struct inode *new_inode = d_inode(new_dentry);
454         struct page *old_dir_page;
455         struct page *old_page, *new_page;
456         struct f2fs_dir_entry *old_dir_entry = NULL;
457         struct f2fs_dir_entry *old_entry;
458         struct f2fs_dir_entry *new_entry;
459         int err = -ENOENT;
460 
461         f2fs_balance_fs(sbi);
462 
463         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
464         if (!old_entry)
465                 goto out;
466 
467         if (S_ISDIR(old_inode->i_mode)) {
468                 err = -EIO;
469                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
470                 if (!old_dir_entry)
471                         goto out_old;
472         }
473 
474         if (new_inode) {
475 
476                 err = -ENOTEMPTY;
477                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
478                         goto out_dir;
479 
480                 err = -ENOENT;
481                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
482                                                 &new_page);
483                 if (!new_entry)
484                         goto out_dir;
485 
486                 f2fs_lock_op(sbi);
487 
488                 err = acquire_orphan_inode(sbi);
489                 if (err)
490                         goto put_out_dir;
491 
492                 if (update_dent_inode(old_inode, &new_dentry->d_name)) {
493                         release_orphan_inode(sbi);
494                         goto put_out_dir;
495                 }
496 
497                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
498 
499                 new_inode->i_ctime = CURRENT_TIME;
500                 down_write(&F2FS_I(new_inode)->i_sem);
501                 if (old_dir_entry)
502                         drop_nlink(new_inode);
503                 drop_nlink(new_inode);
504                 up_write(&F2FS_I(new_inode)->i_sem);
505 
506                 mark_inode_dirty(new_inode);
507 
508                 if (!new_inode->i_nlink)
509                         add_orphan_inode(sbi, new_inode->i_ino);
510                 else
511                         release_orphan_inode(sbi);
512 
513                 update_inode_page(old_inode);
514                 update_inode_page(new_inode);
515         } else {
516                 f2fs_lock_op(sbi);
517 
518                 err = f2fs_add_link(new_dentry, old_inode);
519                 if (err) {
520                         f2fs_unlock_op(sbi);
521                         goto out_dir;
522                 }
523 
524                 if (old_dir_entry) {
525                         inc_nlink(new_dir);
526                         update_inode_page(new_dir);
527                 }
528         }
529 
530         down_write(&F2FS_I(old_inode)->i_sem);
531         file_lost_pino(old_inode);
532         up_write(&F2FS_I(old_inode)->i_sem);
533 
534         old_inode->i_ctime = CURRENT_TIME;
535         mark_inode_dirty(old_inode);
536 
537         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
538 
539         if (old_dir_entry) {
540                 if (old_dir != new_dir) {
541                         f2fs_set_link(old_inode, old_dir_entry,
542                                                 old_dir_page, new_dir);
543                         update_inode_page(old_inode);
544                 } else {
545                         f2fs_dentry_kunmap(old_inode, old_dir_page);
546                         f2fs_put_page(old_dir_page, 0);
547                 }
548                 drop_nlink(old_dir);
549                 mark_inode_dirty(old_dir);
550                 update_inode_page(old_dir);
551         }
552 
553         f2fs_unlock_op(sbi);
554 
555         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
556                 f2fs_sync_fs(sbi->sb, 1);
557         return 0;
558 
559 put_out_dir:
560         f2fs_unlock_op(sbi);
561         f2fs_dentry_kunmap(new_dir, new_page);
562         f2fs_put_page(new_page, 0);
563 out_dir:
564         if (old_dir_entry) {
565                 f2fs_dentry_kunmap(old_inode, old_dir_page);
566                 f2fs_put_page(old_dir_page, 0);
567         }
568 out_old:
569         f2fs_dentry_kunmap(old_dir, old_page);
570         f2fs_put_page(old_page, 0);
571 out:
572         return err;
573 }
574 
575 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
576                              struct inode *new_dir, struct dentry *new_dentry)
577 {
578         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
579         struct inode *old_inode = d_inode(old_dentry);
580         struct inode *new_inode = d_inode(new_dentry);
581         struct page *old_dir_page, *new_dir_page;
582         struct page *old_page, *new_page;
583         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
584         struct f2fs_dir_entry *old_entry, *new_entry;
585         int old_nlink = 0, new_nlink = 0;
586         int err = -ENOENT;
587 
588         f2fs_balance_fs(sbi);
589 
590         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
591         if (!old_entry)
592                 goto out;
593 
594         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
595         if (!new_entry)
596                 goto out_old;
597 
598         /* prepare for updating ".." directory entry info later */
599         if (old_dir != new_dir) {
600                 if (S_ISDIR(old_inode->i_mode)) {
601                         err = -EIO;
602                         old_dir_entry = f2fs_parent_dir(old_inode,
603                                                         &old_dir_page);
604                         if (!old_dir_entry)
605                                 goto out_new;
606                 }
607 
608                 if (S_ISDIR(new_inode->i_mode)) {
609                         err = -EIO;
610                         new_dir_entry = f2fs_parent_dir(new_inode,
611                                                         &new_dir_page);
612                         if (!new_dir_entry)
613                                 goto out_old_dir;
614                 }
615         }
616 
617         /*
618          * If cross rename between file and directory those are not
619          * in the same directory, we will inc nlink of file's parent
620          * later, so we should check upper boundary of its nlink.
621          */
622         if ((!old_dir_entry || !new_dir_entry) &&
623                                 old_dir_entry != new_dir_entry) {
624                 old_nlink = old_dir_entry ? -1 : 1;
625                 new_nlink = -old_nlink;
626                 err = -EMLINK;
627                 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
628                         (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
629                         goto out_new_dir;
630         }
631 
632         f2fs_lock_op(sbi);
633 
634         err = update_dent_inode(old_inode, &new_dentry->d_name);
635         if (err)
636                 goto out_unlock;
637 
638         err = update_dent_inode(new_inode, &old_dentry->d_name);
639         if (err)
640                 goto out_undo;
641 
642         /* update ".." directory entry info of old dentry */
643         if (old_dir_entry)
644                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
645 
646         /* update ".." directory entry info of new dentry */
647         if (new_dir_entry)
648                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
649 
650         /* update directory entry info of old dir inode */
651         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
652 
653         down_write(&F2FS_I(old_inode)->i_sem);
654         file_lost_pino(old_inode);
655         up_write(&F2FS_I(old_inode)->i_sem);
656 
657         update_inode_page(old_inode);
658 
659         old_dir->i_ctime = CURRENT_TIME;
660         if (old_nlink) {
661                 down_write(&F2FS_I(old_dir)->i_sem);
662                 if (old_nlink < 0)
663                         drop_nlink(old_dir);
664                 else
665                         inc_nlink(old_dir);
666                 up_write(&F2FS_I(old_dir)->i_sem);
667         }
668         mark_inode_dirty(old_dir);
669         update_inode_page(old_dir);
670 
671         /* update directory entry info of new dir inode */
672         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
673 
674         down_write(&F2FS_I(new_inode)->i_sem);
675         file_lost_pino(new_inode);
676         up_write(&F2FS_I(new_inode)->i_sem);
677 
678         update_inode_page(new_inode);
679 
680         new_dir->i_ctime = CURRENT_TIME;
681         if (new_nlink) {
682                 down_write(&F2FS_I(new_dir)->i_sem);
683                 if (new_nlink < 0)
684                         drop_nlink(new_dir);
685                 else
686                         inc_nlink(new_dir);
687                 up_write(&F2FS_I(new_dir)->i_sem);
688         }
689         mark_inode_dirty(new_dir);
690         update_inode_page(new_dir);
691 
692         f2fs_unlock_op(sbi);
693 
694         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
695                 f2fs_sync_fs(sbi->sb, 1);
696         return 0;
697 out_undo:
698         /* Still we may fail to recover name info of f2fs_inode here */
699         update_dent_inode(old_inode, &old_dentry->d_name);
700 out_unlock:
701         f2fs_unlock_op(sbi);
702 out_new_dir:
703         if (new_dir_entry) {
704                 f2fs_dentry_kunmap(new_inode, new_dir_page);
705                 f2fs_put_page(new_dir_page, 0);
706         }
707 out_old_dir:
708         if (old_dir_entry) {
709                 f2fs_dentry_kunmap(old_inode, old_dir_page);
710                 f2fs_put_page(old_dir_page, 0);
711         }
712 out_new:
713         f2fs_dentry_kunmap(new_dir, new_page);
714         f2fs_put_page(new_page, 0);
715 out_old:
716         f2fs_dentry_kunmap(old_dir, old_page);
717         f2fs_put_page(old_page, 0);
718 out:
719         return err;
720 }
721 
722 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
723                         struct inode *new_dir, struct dentry *new_dentry,
724                         unsigned int flags)
725 {
726         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
727                 return -EINVAL;
728 
729         if (flags & RENAME_EXCHANGE) {
730                 return f2fs_cross_rename(old_dir, old_dentry,
731                                          new_dir, new_dentry);
732         }
733         /*
734          * VFS has already handled the new dentry existence case,
735          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
736          */
737         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry);
738 }
739 
740 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
741 {
742         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
743         struct inode *inode;
744         int err;
745 
746         inode = f2fs_new_inode(dir, mode);
747         if (IS_ERR(inode))
748                 return PTR_ERR(inode);
749 
750         inode->i_op = &f2fs_file_inode_operations;
751         inode->i_fop = &f2fs_file_operations;
752         inode->i_mapping->a_ops = &f2fs_dblock_aops;
753 
754         f2fs_lock_op(sbi);
755         err = acquire_orphan_inode(sbi);
756         if (err)
757                 goto out;
758 
759         err = f2fs_do_tmpfile(inode, dir);
760         if (err)
761                 goto release_out;
762 
763         /*
764          * add this non-linked tmpfile to orphan list, in this way we could
765          * remove all unused data of tmpfile after abnormal power-off.
766          */
767         add_orphan_inode(sbi, inode->i_ino);
768         f2fs_unlock_op(sbi);
769 
770         alloc_nid_done(sbi, inode->i_ino);
771 
772         stat_inc_inline_inode(inode);
773         d_tmpfile(dentry, inode);
774         unlock_new_inode(inode);
775         return 0;
776 
777 release_out:
778         release_orphan_inode(sbi);
779 out:
780         handle_failed_inode(inode);
781         return err;
782 }
783 
784 const struct inode_operations f2fs_dir_inode_operations = {
785         .create         = f2fs_create,
786         .lookup         = f2fs_lookup,
787         .link           = f2fs_link,
788         .unlink         = f2fs_unlink,
789         .symlink        = f2fs_symlink,
790         .mkdir          = f2fs_mkdir,
791         .rmdir          = f2fs_rmdir,
792         .mknod          = f2fs_mknod,
793         .rename2        = f2fs_rename2,
794         .tmpfile        = f2fs_tmpfile,
795         .getattr        = f2fs_getattr,
796         .setattr        = f2fs_setattr,
797         .get_acl        = f2fs_get_acl,
798         .set_acl        = f2fs_set_acl,
799 #ifdef CONFIG_F2FS_FS_XATTR
800         .setxattr       = generic_setxattr,
801         .getxattr       = generic_getxattr,
802         .listxattr      = f2fs_listxattr,
803         .removexattr    = generic_removexattr,
804 #endif
805 };
806 
807 const struct inode_operations f2fs_symlink_inode_operations = {
808         .readlink       = generic_readlink,
809         .follow_link    = f2fs_follow_link,
810         .put_link       = page_put_link,
811         .getattr        = f2fs_getattr,
812         .setattr        = f2fs_setattr,
813 #ifdef CONFIG_F2FS_FS_XATTR
814         .setxattr       = generic_setxattr,
815         .getxattr       = generic_getxattr,
816         .listxattr      = f2fs_listxattr,
817         .removexattr    = generic_removexattr,
818 #endif
819 };
820 
821 const struct inode_operations f2fs_special_inode_operations = {
822         .getattr        = f2fs_getattr,
823         .setattr        = f2fs_setattr,
824         .get_acl        = f2fs_get_acl,
825         .set_acl        = f2fs_set_acl,
826 #ifdef CONFIG_F2FS_FS_XATTR
827         .setxattr       = generic_setxattr,
828         .getxattr       = generic_getxattr,
829         .listxattr      = f2fs_listxattr,
830         .removexattr    = generic_removexattr,
831 #endif
832 };
833 

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