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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 (f2fs_may_encrypt(dir, inode))
 79                 f2fs_set_encrypted_inode(inode);
 80 
 81         if (f2fs_sb_has_extra_attr(sbi)) {
 82                 set_inode_flag(inode, FI_EXTRA_ATTR);
 83                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
 84         }
 85 
 86         if (test_opt(sbi, INLINE_XATTR))
 87                 set_inode_flag(inode, FI_INLINE_XATTR);
 88 
 89         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
 90                 set_inode_flag(inode, FI_INLINE_DATA);
 91         if (f2fs_may_inline_dentry(inode))
 92                 set_inode_flag(inode, FI_INLINE_DENTRY);
 93 
 94         if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
 95                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
 96                 if (f2fs_has_inline_xattr(inode))
 97                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
 98                 /* Otherwise, will be 0 */
 99         } else if (f2fs_has_inline_xattr(inode) ||
100                                 f2fs_has_inline_dentry(inode)) {
101                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
102         }
103         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
104 
105         f2fs_init_extent_tree(inode, NULL);
106 
107         stat_inc_inline_xattr(inode);
108         stat_inc_inline_inode(inode);
109         stat_inc_inline_dir(inode);
110 
111         F2FS_I(inode)->i_flags =
112                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
113 
114         if (S_ISDIR(inode->i_mode))
115                 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
116 
117         if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
118                 set_inode_flag(inode, FI_PROJ_INHERIT);
119 
120         if (f2fs_sb_has_compression(sbi)) {
121                 /* Inherit the compression flag in directory */
122                 if ((F2FS_I(dir)->i_flags & F2FS_COMPR_FL) &&
123                                         f2fs_may_compress(inode))
124                         set_compress_context(inode);
125         }
126 
127         f2fs_set_inode_flags(inode);
128 
129         trace_f2fs_new_inode(inode, 0);
130         return inode;
131 
132 fail:
133         trace_f2fs_new_inode(inode, err);
134         make_bad_inode(inode);
135         if (nid_free)
136                 set_inode_flag(inode, FI_FREE_NID);
137         iput(inode);
138         return ERR_PTR(err);
139 fail_drop:
140         trace_f2fs_new_inode(inode, err);
141         dquot_drop(inode);
142         inode->i_flags |= S_NOQUOTA;
143         if (nid_free)
144                 set_inode_flag(inode, FI_FREE_NID);
145         clear_nlink(inode);
146         unlock_new_inode(inode);
147         iput(inode);
148         return ERR_PTR(err);
149 }
150 
151 static inline int is_extension_exist(const unsigned char *s, const char *sub)
152 {
153         size_t slen = strlen(s);
154         size_t sublen = strlen(sub);
155         int i;
156 
157         if (sublen == 1 && *sub == '*')
158                 return 1;
159 
160         /*
161          * filename format of multimedia file should be defined as:
162          * "filename + '.' + extension + (optional: '.' + temp extension)".
163          */
164         if (slen < sublen + 2)
165                 return 0;
166 
167         for (i = 1; i < slen - sublen; i++) {
168                 if (s[i] != '.')
169                         continue;
170                 if (!strncasecmp(s + i + 1, sub, sublen))
171                         return 1;
172         }
173 
174         return 0;
175 }
176 
177 /*
178  * Set file's temperature for hot/cold data separation
179  */
180 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
181                 const unsigned char *name)
182 {
183         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
184         int i, cold_count, hot_count;
185 
186         down_read(&sbi->sb_lock);
187 
188         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
189         hot_count = sbi->raw_super->hot_ext_count;
190 
191         for (i = 0; i < cold_count + hot_count; i++) {
192                 if (is_extension_exist(name, extlist[i]))
193                         break;
194         }
195 
196         up_read(&sbi->sb_lock);
197 
198         if (i == cold_count + hot_count)
199                 return;
200 
201         if (i < cold_count)
202                 file_set_cold(inode);
203         else
204                 file_set_hot(inode);
205 }
206 
207 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
208                                                         bool hot, bool set)
209 {
210         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
211         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
212         int hot_count = sbi->raw_super->hot_ext_count;
213         int total_count = cold_count + hot_count;
214         int start, count;
215         int i;
216 
217         if (set) {
218                 if (total_count == F2FS_MAX_EXTENSION)
219                         return -EINVAL;
220         } else {
221                 if (!hot && !cold_count)
222                         return -EINVAL;
223                 if (hot && !hot_count)
224                         return -EINVAL;
225         }
226 
227         if (hot) {
228                 start = cold_count;
229                 count = total_count;
230         } else {
231                 start = 0;
232                 count = cold_count;
233         }
234 
235         for (i = start; i < count; i++) {
236                 if (strcmp(name, extlist[i]))
237                         continue;
238 
239                 if (set)
240                         return -EINVAL;
241 
242                 memcpy(extlist[i], extlist[i + 1],
243                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
244                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
245                 if (hot)
246                         sbi->raw_super->hot_ext_count = hot_count - 1;
247                 else
248                         sbi->raw_super->extension_count =
249                                                 cpu_to_le32(cold_count - 1);
250                 return 0;
251         }
252 
253         if (!set)
254                 return -EINVAL;
255 
256         if (hot) {
257                 memcpy(extlist[count], name, strlen(name));
258                 sbi->raw_super->hot_ext_count = hot_count + 1;
259         } else {
260                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
261 
262                 memcpy(buf, &extlist[cold_count],
263                                 F2FS_EXTENSION_LEN * hot_count);
264                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
265                 memcpy(extlist[cold_count], name, strlen(name));
266                 memcpy(&extlist[cold_count + 1], buf,
267                                 F2FS_EXTENSION_LEN * hot_count);
268                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
269         }
270         return 0;
271 }
272 
273 static void set_compress_inode(struct f2fs_sb_info *sbi, struct inode *inode,
274                                                 const unsigned char *name)
275 {
276         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
277         unsigned char (*ext)[F2FS_EXTENSION_LEN];
278         unsigned int ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
279         int i, cold_count, hot_count;
280 
281         if (!f2fs_sb_has_compression(sbi) ||
282                         is_inode_flag_set(inode, FI_COMPRESSED_FILE) ||
283                         F2FS_I(inode)->i_flags & F2FS_NOCOMP_FL ||
284                         !f2fs_may_compress(inode))
285                 return;
286 
287         down_read(&sbi->sb_lock);
288 
289         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
290         hot_count = sbi->raw_super->hot_ext_count;
291 
292         for (i = cold_count; i < cold_count + hot_count; i++) {
293                 if (is_extension_exist(name, extlist[i])) {
294                         up_read(&sbi->sb_lock);
295                         return;
296                 }
297         }
298 
299         up_read(&sbi->sb_lock);
300 
301         ext = F2FS_OPTION(sbi).extensions;
302 
303         for (i = 0; i < ext_cnt; i++) {
304                 if (!is_extension_exist(name, ext[i]))
305                         continue;
306 
307                 set_compress_context(inode);
308                 return;
309         }
310 }
311 
312 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
313                                                 bool excl)
314 {
315         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
316         struct inode *inode;
317         nid_t ino = 0;
318         int err;
319 
320         if (unlikely(f2fs_cp_error(sbi)))
321                 return -EIO;
322         if (!f2fs_is_checkpoint_ready(sbi))
323                 return -ENOSPC;
324 
325         err = dquot_initialize(dir);
326         if (err)
327                 return err;
328 
329         inode = f2fs_new_inode(dir, mode);
330         if (IS_ERR(inode))
331                 return PTR_ERR(inode);
332 
333         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
334                 set_file_temperature(sbi, inode, dentry->d_name.name);
335 
336         set_compress_inode(sbi, inode, dentry->d_name.name);
337 
338         inode->i_op = &f2fs_file_inode_operations;
339         inode->i_fop = &f2fs_file_operations;
340         inode->i_mapping->a_ops = &f2fs_dblock_aops;
341         ino = inode->i_ino;
342 
343         f2fs_lock_op(sbi);
344         err = f2fs_add_link(dentry, inode);
345         if (err)
346                 goto out;
347         f2fs_unlock_op(sbi);
348 
349         f2fs_alloc_nid_done(sbi, ino);
350 
351         d_instantiate_new(dentry, inode);
352 
353         if (IS_DIRSYNC(dir))
354                 f2fs_sync_fs(sbi->sb, 1);
355 
356         f2fs_balance_fs(sbi, true);
357         return 0;
358 out:
359         f2fs_handle_failed_inode(inode);
360         return err;
361 }
362 
363 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
364                 struct dentry *dentry)
365 {
366         struct inode *inode = d_inode(old_dentry);
367         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
368         int err;
369 
370         if (unlikely(f2fs_cp_error(sbi)))
371                 return -EIO;
372         if (!f2fs_is_checkpoint_ready(sbi))
373                 return -ENOSPC;
374 
375         err = fscrypt_prepare_link(old_dentry, dir, dentry);
376         if (err)
377                 return err;
378 
379         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
380                         (!projid_eq(F2FS_I(dir)->i_projid,
381                         F2FS_I(old_dentry->d_inode)->i_projid)))
382                 return -EXDEV;
383 
384         err = dquot_initialize(dir);
385         if (err)
386                 return err;
387 
388         f2fs_balance_fs(sbi, true);
389 
390         inode->i_ctime = current_time(inode);
391         ihold(inode);
392 
393         set_inode_flag(inode, FI_INC_LINK);
394         f2fs_lock_op(sbi);
395         err = f2fs_add_link(dentry, inode);
396         if (err)
397                 goto out;
398         f2fs_unlock_op(sbi);
399 
400         d_instantiate(dentry, inode);
401 
402         if (IS_DIRSYNC(dir))
403                 f2fs_sync_fs(sbi->sb, 1);
404         return 0;
405 out:
406         clear_inode_flag(inode, FI_INC_LINK);
407         iput(inode);
408         f2fs_unlock_op(sbi);
409         return err;
410 }
411 
412 struct dentry *f2fs_get_parent(struct dentry *child)
413 {
414         struct qstr dotdot = QSTR_INIT("..", 2);
415         struct page *page;
416         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
417         if (!ino) {
418                 if (IS_ERR(page))
419                         return ERR_CAST(page);
420                 return ERR_PTR(-ENOENT);
421         }
422         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
423 }
424 
425 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
426 {
427         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
428         struct qstr dot = QSTR_INIT(".", 1);
429         struct qstr dotdot = QSTR_INIT("..", 2);
430         struct f2fs_dir_entry *de;
431         struct page *page;
432         int err = 0;
433 
434         if (f2fs_readonly(sbi->sb)) {
435                 f2fs_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint",
436                           dir->i_ino, pino);
437                 return 0;
438         }
439 
440         err = dquot_initialize(dir);
441         if (err)
442                 return err;
443 
444         f2fs_balance_fs(sbi, true);
445 
446         f2fs_lock_op(sbi);
447 
448         de = f2fs_find_entry(dir, &dot, &page);
449         if (de) {
450                 f2fs_put_page(page, 0);
451         } else if (IS_ERR(page)) {
452                 err = PTR_ERR(page);
453                 goto out;
454         } else {
455                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
456                 if (err)
457                         goto out;
458         }
459 
460         de = f2fs_find_entry(dir, &dotdot, &page);
461         if (de)
462                 f2fs_put_page(page, 0);
463         else if (IS_ERR(page))
464                 err = PTR_ERR(page);
465         else
466                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
467 out:
468         if (!err)
469                 clear_inode_flag(dir, FI_INLINE_DOTS);
470 
471         f2fs_unlock_op(sbi);
472         return err;
473 }
474 
475 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
476                 unsigned int flags)
477 {
478         struct inode *inode = NULL;
479         struct f2fs_dir_entry *de;
480         struct page *page;
481         struct dentry *new;
482         nid_t ino = -1;
483         int err = 0;
484         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
485         struct f2fs_filename fname;
486 
487         trace_f2fs_lookup_start(dir, dentry, flags);
488 
489         if (dentry->d_name.len > F2FS_NAME_LEN) {
490                 err = -ENAMETOOLONG;
491                 goto out;
492         }
493 
494         err = f2fs_prepare_lookup(dir, dentry, &fname);
495         if (err == -ENOENT)
496                 goto out_splice;
497         if (err)
498                 goto out;
499         de = __f2fs_find_entry(dir, &fname, &page);
500         f2fs_free_filename(&fname);
501 
502         if (!de) {
503                 if (IS_ERR(page)) {
504                         err = PTR_ERR(page);
505                         goto out;
506                 }
507                 err = -ENOENT;
508                 goto out_splice;
509         }
510 
511         ino = le32_to_cpu(de->ino);
512         f2fs_put_page(page, 0);
513 
514         inode = f2fs_iget(dir->i_sb, ino);
515         if (IS_ERR(inode)) {
516                 err = PTR_ERR(inode);
517                 goto out;
518         }
519 
520         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
521                 err = __recover_dot_dentries(dir, root_ino);
522                 if (err)
523                         goto out_iput;
524         }
525 
526         if (f2fs_has_inline_dots(inode)) {
527                 err = __recover_dot_dentries(inode, dir->i_ino);
528                 if (err)
529                         goto out_iput;
530         }
531         if (IS_ENCRYPTED(dir) &&
532             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
533             !fscrypt_has_permitted_context(dir, inode)) {
534                 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
535                           dir->i_ino, inode->i_ino);
536                 err = -EPERM;
537                 goto out_iput;
538         }
539 out_splice:
540 #ifdef CONFIG_UNICODE
541         if (!inode && IS_CASEFOLDED(dir)) {
542                 /* Eventually we want to call d_add_ci(dentry, NULL)
543                  * for negative dentries in the encoding case as
544                  * well.  For now, prevent the negative dentry
545                  * from being cached.
546                  */
547                 trace_f2fs_lookup_end(dir, dentry, ino, err);
548                 return NULL;
549         }
550 #endif
551         new = d_splice_alias(inode, dentry);
552         err = PTR_ERR_OR_ZERO(new);
553         trace_f2fs_lookup_end(dir, dentry, ino, !new ? -ENOENT : err);
554         return new;
555 out_iput:
556         iput(inode);
557 out:
558         trace_f2fs_lookup_end(dir, dentry, ino, err);
559         return ERR_PTR(err);
560 }
561 
562 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
563 {
564         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
565         struct inode *inode = d_inode(dentry);
566         struct f2fs_dir_entry *de;
567         struct page *page;
568         int err;
569 
570         trace_f2fs_unlink_enter(dir, dentry);
571 
572         if (unlikely(f2fs_cp_error(sbi))) {
573                 err = -EIO;
574                 goto fail;
575         }
576 
577         err = dquot_initialize(dir);
578         if (err)
579                 goto fail;
580         err = dquot_initialize(inode);
581         if (err)
582                 goto fail;
583 
584         de = f2fs_find_entry(dir, &dentry->d_name, &page);
585         if (!de) {
586                 if (IS_ERR(page))
587                         err = PTR_ERR(page);
588                 goto fail;
589         }
590 
591         f2fs_balance_fs(sbi, true);
592 
593         f2fs_lock_op(sbi);
594         err = f2fs_acquire_orphan_inode(sbi);
595         if (err) {
596                 f2fs_unlock_op(sbi);
597                 f2fs_put_page(page, 0);
598                 goto fail;
599         }
600         f2fs_delete_entry(de, page, dir, inode);
601 #ifdef CONFIG_UNICODE
602         /* VFS negative dentries are incompatible with Encoding and
603          * Case-insensitiveness. Eventually we'll want avoid
604          * invalidating the dentries here, alongside with returning the
605          * negative dentries at f2fs_lookup(), when it is better
606          * supported by the VFS for the CI case.
607          */
608         if (IS_CASEFOLDED(dir))
609                 d_invalidate(dentry);
610 #endif
611         f2fs_unlock_op(sbi);
612 
613         if (IS_DIRSYNC(dir))
614                 f2fs_sync_fs(sbi->sb, 1);
615 fail:
616         trace_f2fs_unlink_exit(inode, err);
617         return err;
618 }
619 
620 static const char *f2fs_get_link(struct dentry *dentry,
621                                  struct inode *inode,
622                                  struct delayed_call *done)
623 {
624         const char *link = page_get_link(dentry, inode, done);
625         if (!IS_ERR(link) && !*link) {
626                 /* this is broken symlink case */
627                 do_delayed_call(done);
628                 clear_delayed_call(done);
629                 link = ERR_PTR(-ENOENT);
630         }
631         return link;
632 }
633 
634 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
635                                         const char *symname)
636 {
637         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
638         struct inode *inode;
639         size_t len = strlen(symname);
640         struct fscrypt_str disk_link;
641         int err;
642 
643         if (unlikely(f2fs_cp_error(sbi)))
644                 return -EIO;
645         if (!f2fs_is_checkpoint_ready(sbi))
646                 return -ENOSPC;
647 
648         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
649                                       &disk_link);
650         if (err)
651                 return err;
652 
653         err = dquot_initialize(dir);
654         if (err)
655                 return err;
656 
657         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
658         if (IS_ERR(inode))
659                 return PTR_ERR(inode);
660 
661         if (IS_ENCRYPTED(inode))
662                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
663         else
664                 inode->i_op = &f2fs_symlink_inode_operations;
665         inode_nohighmem(inode);
666         inode->i_mapping->a_ops = &f2fs_dblock_aops;
667 
668         f2fs_lock_op(sbi);
669         err = f2fs_add_link(dentry, inode);
670         if (err)
671                 goto out_f2fs_handle_failed_inode;
672         f2fs_unlock_op(sbi);
673         f2fs_alloc_nid_done(sbi, inode->i_ino);
674 
675         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
676         if (err)
677                 goto err_out;
678 
679         err = page_symlink(inode, disk_link.name, disk_link.len);
680 
681 err_out:
682         d_instantiate_new(dentry, inode);
683 
684         /*
685          * Let's flush symlink data in order to avoid broken symlink as much as
686          * possible. Nevertheless, fsyncing is the best way, but there is no
687          * way to get a file descriptor in order to flush that.
688          *
689          * Note that, it needs to do dir->fsync to make this recoverable.
690          * If the symlink path is stored into inline_data, there is no
691          * performance regression.
692          */
693         if (!err) {
694                 filemap_write_and_wait_range(inode->i_mapping, 0,
695                                                         disk_link.len - 1);
696 
697                 if (IS_DIRSYNC(dir))
698                         f2fs_sync_fs(sbi->sb, 1);
699         } else {
700                 f2fs_unlink(dir, dentry);
701         }
702 
703         f2fs_balance_fs(sbi, true);
704         goto out_free_encrypted_link;
705 
706 out_f2fs_handle_failed_inode:
707         f2fs_handle_failed_inode(inode);
708 out_free_encrypted_link:
709         if (disk_link.name != (unsigned char *)symname)
710                 kvfree(disk_link.name);
711         return err;
712 }
713 
714 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
715 {
716         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
717         struct inode *inode;
718         int err;
719 
720         if (unlikely(f2fs_cp_error(sbi)))
721                 return -EIO;
722 
723         err = dquot_initialize(dir);
724         if (err)
725                 return err;
726 
727         inode = f2fs_new_inode(dir, S_IFDIR | mode);
728         if (IS_ERR(inode))
729                 return PTR_ERR(inode);
730 
731         inode->i_op = &f2fs_dir_inode_operations;
732         inode->i_fop = &f2fs_dir_operations;
733         inode->i_mapping->a_ops = &f2fs_dblock_aops;
734         inode_nohighmem(inode);
735 
736         set_inode_flag(inode, FI_INC_LINK);
737         f2fs_lock_op(sbi);
738         err = f2fs_add_link(dentry, inode);
739         if (err)
740                 goto out_fail;
741         f2fs_unlock_op(sbi);
742 
743         f2fs_alloc_nid_done(sbi, inode->i_ino);
744 
745         d_instantiate_new(dentry, inode);
746 
747         if (IS_DIRSYNC(dir))
748                 f2fs_sync_fs(sbi->sb, 1);
749 
750         f2fs_balance_fs(sbi, true);
751         return 0;
752 
753 out_fail:
754         clear_inode_flag(inode, FI_INC_LINK);
755         f2fs_handle_failed_inode(inode);
756         return err;
757 }
758 
759 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
760 {
761         struct inode *inode = d_inode(dentry);
762         if (f2fs_empty_dir(inode))
763                 return f2fs_unlink(dir, dentry);
764         return -ENOTEMPTY;
765 }
766 
767 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
768                                 umode_t mode, dev_t rdev)
769 {
770         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
771         struct inode *inode;
772         int err = 0;
773 
774         if (unlikely(f2fs_cp_error(sbi)))
775                 return -EIO;
776         if (!f2fs_is_checkpoint_ready(sbi))
777                 return -ENOSPC;
778 
779         err = dquot_initialize(dir);
780         if (err)
781                 return err;
782 
783         inode = f2fs_new_inode(dir, mode);
784         if (IS_ERR(inode))
785                 return PTR_ERR(inode);
786 
787         init_special_inode(inode, inode->i_mode, rdev);
788         inode->i_op = &f2fs_special_inode_operations;
789 
790         f2fs_lock_op(sbi);
791         err = f2fs_add_link(dentry, inode);
792         if (err)
793                 goto out;
794         f2fs_unlock_op(sbi);
795 
796         f2fs_alloc_nid_done(sbi, inode->i_ino);
797 
798         d_instantiate_new(dentry, inode);
799 
800         if (IS_DIRSYNC(dir))
801                 f2fs_sync_fs(sbi->sb, 1);
802 
803         f2fs_balance_fs(sbi, true);
804         return 0;
805 out:
806         f2fs_handle_failed_inode(inode);
807         return err;
808 }
809 
810 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
811                                         umode_t mode, struct inode **whiteout)
812 {
813         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
814         struct inode *inode;
815         int err;
816 
817         err = dquot_initialize(dir);
818         if (err)
819                 return err;
820 
821         inode = f2fs_new_inode(dir, mode);
822         if (IS_ERR(inode))
823                 return PTR_ERR(inode);
824 
825         if (whiteout) {
826                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
827                 inode->i_op = &f2fs_special_inode_operations;
828         } else {
829                 inode->i_op = &f2fs_file_inode_operations;
830                 inode->i_fop = &f2fs_file_operations;
831                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
832         }
833 
834         f2fs_lock_op(sbi);
835         err = f2fs_acquire_orphan_inode(sbi);
836         if (err)
837                 goto out;
838 
839         err = f2fs_do_tmpfile(inode, dir);
840         if (err)
841                 goto release_out;
842 
843         /*
844          * add this non-linked tmpfile to orphan list, in this way we could
845          * remove all unused data of tmpfile after abnormal power-off.
846          */
847         f2fs_add_orphan_inode(inode);
848         f2fs_alloc_nid_done(sbi, inode->i_ino);
849 
850         if (whiteout) {
851                 f2fs_i_links_write(inode, false);
852                 inode->i_state |= I_LINKABLE;
853                 *whiteout = inode;
854         } else {
855                 d_tmpfile(dentry, inode);
856         }
857         /* link_count was changed by d_tmpfile as well. */
858         f2fs_unlock_op(sbi);
859         unlock_new_inode(inode);
860 
861         f2fs_balance_fs(sbi, true);
862         return 0;
863 
864 release_out:
865         f2fs_release_orphan_inode(sbi);
866 out:
867         f2fs_handle_failed_inode(inode);
868         return err;
869 }
870 
871 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
872 {
873         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
874 
875         if (unlikely(f2fs_cp_error(sbi)))
876                 return -EIO;
877         if (!f2fs_is_checkpoint_ready(sbi))
878                 return -ENOSPC;
879 
880         return __f2fs_tmpfile(dir, dentry, mode, NULL);
881 }
882 
883 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
884 {
885         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
886                 return -EIO;
887 
888         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
889 }
890 
891 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
892                         struct inode *new_dir, struct dentry *new_dentry,
893                         unsigned int flags)
894 {
895         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
896         struct inode *old_inode = d_inode(old_dentry);
897         struct inode *new_inode = d_inode(new_dentry);
898         struct inode *whiteout = NULL;
899         struct page *old_dir_page = NULL;
900         struct page *old_page, *new_page = NULL;
901         struct f2fs_dir_entry *old_dir_entry = NULL;
902         struct f2fs_dir_entry *old_entry;
903         struct f2fs_dir_entry *new_entry;
904         int err;
905 
906         if (unlikely(f2fs_cp_error(sbi)))
907                 return -EIO;
908         if (!f2fs_is_checkpoint_ready(sbi))
909                 return -ENOSPC;
910 
911         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
912                         (!projid_eq(F2FS_I(new_dir)->i_projid,
913                         F2FS_I(old_dentry->d_inode)->i_projid)))
914                 return -EXDEV;
915 
916         /*
917          * If new_inode is null, the below renaming flow will
918          * add a link in old_dir which can conver inline_dir.
919          * After then, if we failed to get the entry due to other
920          * reasons like ENOMEM, we had to remove the new entry.
921          * Instead of adding such the error handling routine, let's
922          * simply convert first here.
923          */
924         if (old_dir == new_dir && !new_inode) {
925                 err = f2fs_try_convert_inline_dir(old_dir, new_dentry);
926                 if (err)
927                         return err;
928         }
929 
930         if (flags & RENAME_WHITEOUT) {
931                 err = f2fs_create_whiteout(old_dir, &whiteout);
932                 if (err)
933                         return err;
934         }
935 
936         err = dquot_initialize(old_dir);
937         if (err)
938                 goto out;
939 
940         err = dquot_initialize(new_dir);
941         if (err)
942                 goto out;
943 
944         if (new_inode) {
945                 err = dquot_initialize(new_inode);
946                 if (err)
947                         goto out;
948         }
949 
950         err = -ENOENT;
951         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
952         if (!old_entry) {
953                 if (IS_ERR(old_page))
954                         err = PTR_ERR(old_page);
955                 goto out;
956         }
957 
958         if (S_ISDIR(old_inode->i_mode)) {
959                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
960                 if (!old_dir_entry) {
961                         if (IS_ERR(old_dir_page))
962                                 err = PTR_ERR(old_dir_page);
963                         goto out_old;
964                 }
965         }
966 
967         if (new_inode) {
968 
969                 err = -ENOTEMPTY;
970                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
971                         goto out_dir;
972 
973                 err = -ENOENT;
974                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
975                                                 &new_page);
976                 if (!new_entry) {
977                         if (IS_ERR(new_page))
978                                 err = PTR_ERR(new_page);
979                         goto out_dir;
980                 }
981 
982                 f2fs_balance_fs(sbi, true);
983 
984                 f2fs_lock_op(sbi);
985 
986                 err = f2fs_acquire_orphan_inode(sbi);
987                 if (err)
988                         goto put_out_dir;
989 
990                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
991                 new_page = NULL;
992 
993                 new_inode->i_ctime = current_time(new_inode);
994                 down_write(&F2FS_I(new_inode)->i_sem);
995                 if (old_dir_entry)
996                         f2fs_i_links_write(new_inode, false);
997                 f2fs_i_links_write(new_inode, false);
998                 up_write(&F2FS_I(new_inode)->i_sem);
999 
1000                 if (!new_inode->i_nlink)
1001                         f2fs_add_orphan_inode(new_inode);
1002                 else
1003                         f2fs_release_orphan_inode(sbi);
1004         } else {
1005                 f2fs_balance_fs(sbi, true);
1006 
1007                 f2fs_lock_op(sbi);
1008 
1009                 err = f2fs_add_link(new_dentry, old_inode);
1010                 if (err) {
1011                         f2fs_unlock_op(sbi);
1012                         goto out_dir;
1013                 }
1014 
1015                 if (old_dir_entry)
1016                         f2fs_i_links_write(new_dir, true);
1017         }
1018 
1019         down_write(&F2FS_I(old_inode)->i_sem);
1020         if (!old_dir_entry || whiteout)
1021                 file_lost_pino(old_inode);
1022         else
1023                 /* adjust dir's i_pino to pass fsck check */
1024                 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1025         up_write(&F2FS_I(old_inode)->i_sem);
1026 
1027         old_inode->i_ctime = current_time(old_inode);
1028         f2fs_mark_inode_dirty_sync(old_inode, false);
1029 
1030         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
1031         old_page = NULL;
1032 
1033         if (whiteout) {
1034                 set_inode_flag(whiteout, FI_INC_LINK);
1035                 err = f2fs_add_link(old_dentry, whiteout);
1036                 if (err)
1037                         goto put_out_dir;
1038                 whiteout->i_state &= ~I_LINKABLE;
1039                 iput(whiteout);
1040         }
1041 
1042         if (old_dir_entry) {
1043                 if (old_dir != new_dir && !whiteout)
1044                         f2fs_set_link(old_inode, old_dir_entry,
1045                                                 old_dir_page, new_dir);
1046                 else
1047                         f2fs_put_page(old_dir_page, 0);
1048                 f2fs_i_links_write(old_dir, false);
1049         }
1050         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1051                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1052                 if (S_ISDIR(old_inode->i_mode))
1053                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
1054                                                         TRANS_DIR_INO);
1055         }
1056 
1057         f2fs_unlock_op(sbi);
1058 
1059         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1060                 f2fs_sync_fs(sbi->sb, 1);
1061 
1062         f2fs_update_time(sbi, REQ_TIME);
1063         return 0;
1064 
1065 put_out_dir:
1066         f2fs_unlock_op(sbi);
1067         f2fs_put_page(new_page, 0);
1068 out_dir:
1069         if (old_dir_entry)
1070                 f2fs_put_page(old_dir_page, 0);
1071 out_old:
1072         f2fs_put_page(old_page, 0);
1073 out:
1074         if (whiteout)
1075                 iput(whiteout);
1076         return err;
1077 }
1078 
1079 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1080                              struct inode *new_dir, struct dentry *new_dentry)
1081 {
1082         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1083         struct inode *old_inode = d_inode(old_dentry);
1084         struct inode *new_inode = d_inode(new_dentry);
1085         struct page *old_dir_page, *new_dir_page;
1086         struct page *old_page, *new_page;
1087         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1088         struct f2fs_dir_entry *old_entry, *new_entry;
1089         int old_nlink = 0, new_nlink = 0;
1090         int err;
1091 
1092         if (unlikely(f2fs_cp_error(sbi)))
1093                 return -EIO;
1094         if (!f2fs_is_checkpoint_ready(sbi))
1095                 return -ENOSPC;
1096 
1097         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1098                         !projid_eq(F2FS_I(new_dir)->i_projid,
1099                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1100             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1101                         !projid_eq(F2FS_I(old_dir)->i_projid,
1102                         F2FS_I(new_dentry->d_inode)->i_projid)))
1103                 return -EXDEV;
1104 
1105         err = dquot_initialize(old_dir);
1106         if (err)
1107                 goto out;
1108 
1109         err = dquot_initialize(new_dir);
1110         if (err)
1111                 goto out;
1112 
1113         err = -ENOENT;
1114         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1115         if (!old_entry) {
1116                 if (IS_ERR(old_page))
1117                         err = PTR_ERR(old_page);
1118                 goto out;
1119         }
1120 
1121         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1122         if (!new_entry) {
1123                 if (IS_ERR(new_page))
1124                         err = PTR_ERR(new_page);
1125                 goto out_old;
1126         }
1127 
1128         /* prepare for updating ".." directory entry info later */
1129         if (old_dir != new_dir) {
1130                 if (S_ISDIR(old_inode->i_mode)) {
1131                         old_dir_entry = f2fs_parent_dir(old_inode,
1132                                                         &old_dir_page);
1133                         if (!old_dir_entry) {
1134                                 if (IS_ERR(old_dir_page))
1135                                         err = PTR_ERR(old_dir_page);
1136                                 goto out_new;
1137                         }
1138                 }
1139 
1140                 if (S_ISDIR(new_inode->i_mode)) {
1141                         new_dir_entry = f2fs_parent_dir(new_inode,
1142                                                         &new_dir_page);
1143                         if (!new_dir_entry) {
1144                                 if (IS_ERR(new_dir_page))
1145                                         err = PTR_ERR(new_dir_page);
1146                                 goto out_old_dir;
1147                         }
1148                 }
1149         }
1150 
1151         /*
1152          * If cross rename between file and directory those are not
1153          * in the same directory, we will inc nlink of file's parent
1154          * later, so we should check upper boundary of its nlink.
1155          */
1156         if ((!old_dir_entry || !new_dir_entry) &&
1157                                 old_dir_entry != new_dir_entry) {
1158                 old_nlink = old_dir_entry ? -1 : 1;
1159                 new_nlink = -old_nlink;
1160                 err = -EMLINK;
1161                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1162                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1163                         goto out_new_dir;
1164         }
1165 
1166         f2fs_balance_fs(sbi, true);
1167 
1168         f2fs_lock_op(sbi);
1169 
1170         /* update ".." directory entry info of old dentry */
1171         if (old_dir_entry)
1172                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1173 
1174         /* update ".." directory entry info of new dentry */
1175         if (new_dir_entry)
1176                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1177 
1178         /* update directory entry info of old dir inode */
1179         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1180 
1181         down_write(&F2FS_I(old_inode)->i_sem);
1182         if (!old_dir_entry)
1183                 file_lost_pino(old_inode);
1184         else
1185                 /* adjust dir's i_pino to pass fsck check */
1186                 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1187         up_write(&F2FS_I(old_inode)->i_sem);
1188 
1189         old_dir->i_ctime = current_time(old_dir);
1190         if (old_nlink) {
1191                 down_write(&F2FS_I(old_dir)->i_sem);
1192                 f2fs_i_links_write(old_dir, old_nlink > 0);
1193                 up_write(&F2FS_I(old_dir)->i_sem);
1194         }
1195         f2fs_mark_inode_dirty_sync(old_dir, false);
1196 
1197         /* update directory entry info of new dir inode */
1198         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1199 
1200         down_write(&F2FS_I(new_inode)->i_sem);
1201         if (!new_dir_entry)
1202                 file_lost_pino(new_inode);
1203         else
1204                 /* adjust dir's i_pino to pass fsck check */
1205                 f2fs_i_pino_write(new_inode, old_dir->i_ino);
1206         up_write(&F2FS_I(new_inode)->i_sem);
1207 
1208         new_dir->i_ctime = current_time(new_dir);
1209         if (new_nlink) {
1210                 down_write(&F2FS_I(new_dir)->i_sem);
1211                 f2fs_i_links_write(new_dir, new_nlink > 0);
1212                 up_write(&F2FS_I(new_dir)->i_sem);
1213         }
1214         f2fs_mark_inode_dirty_sync(new_dir, false);
1215 
1216         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1217                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1218                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1219         }
1220 
1221         f2fs_unlock_op(sbi);
1222 
1223         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1224                 f2fs_sync_fs(sbi->sb, 1);
1225 
1226         f2fs_update_time(sbi, REQ_TIME);
1227         return 0;
1228 out_new_dir:
1229         if (new_dir_entry) {
1230                 f2fs_put_page(new_dir_page, 0);
1231         }
1232 out_old_dir:
1233         if (old_dir_entry) {
1234                 f2fs_put_page(old_dir_page, 0);
1235         }
1236 out_new:
1237         f2fs_put_page(new_page, 0);
1238 out_old:
1239         f2fs_put_page(old_page, 0);
1240 out:
1241         return err;
1242 }
1243 
1244 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1245                         struct inode *new_dir, struct dentry *new_dentry,
1246                         unsigned int flags)
1247 {
1248         int err;
1249 
1250         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1251                 return -EINVAL;
1252 
1253         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1254                                      flags);
1255         if (err)
1256                 return err;
1257 
1258         if (flags & RENAME_EXCHANGE) {
1259                 return f2fs_cross_rename(old_dir, old_dentry,
1260                                          new_dir, new_dentry);
1261         }
1262         /*
1263          * VFS has already handled the new dentry existence case,
1264          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1265          */
1266         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1267 }
1268 
1269 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1270                                            struct inode *inode,
1271                                            struct delayed_call *done)
1272 {
1273         struct page *page;
1274         const char *target;
1275 
1276         if (!dentry)
1277                 return ERR_PTR(-ECHILD);
1278 
1279         page = read_mapping_page(inode->i_mapping, 0, NULL);
1280         if (IS_ERR(page))
1281                 return ERR_CAST(page);
1282 
1283         target = fscrypt_get_symlink(inode, page_address(page),
1284                                      inode->i_sb->s_blocksize, done);
1285         put_page(page);
1286         return target;
1287 }
1288 
1289 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1290         .get_link       = f2fs_encrypted_get_link,
1291         .getattr        = f2fs_getattr,
1292         .setattr        = f2fs_setattr,
1293         .listxattr      = f2fs_listxattr,
1294 };
1295 
1296 const struct inode_operations f2fs_dir_inode_operations = {
1297         .create         = f2fs_create,
1298         .lookup         = f2fs_lookup,
1299         .link           = f2fs_link,
1300         .unlink         = f2fs_unlink,
1301         .symlink        = f2fs_symlink,
1302         .mkdir          = f2fs_mkdir,
1303         .rmdir          = f2fs_rmdir,
1304         .mknod          = f2fs_mknod,
1305         .rename         = f2fs_rename2,
1306         .tmpfile        = f2fs_tmpfile,
1307         .getattr        = f2fs_getattr,
1308         .setattr        = f2fs_setattr,
1309         .get_acl        = f2fs_get_acl,
1310         .set_acl        = f2fs_set_acl,
1311         .listxattr      = f2fs_listxattr,
1312         .fiemap         = f2fs_fiemap,
1313 };
1314 
1315 const struct inode_operations f2fs_symlink_inode_operations = {
1316         .get_link       = f2fs_get_link,
1317         .getattr        = f2fs_getattr,
1318         .setattr        = f2fs_setattr,
1319         .listxattr      = f2fs_listxattr,
1320 };
1321 
1322 const struct inode_operations f2fs_special_inode_operations = {
1323         .getattr        = f2fs_getattr,
1324         .setattr        = f2fs_setattr,
1325         .get_acl        = f2fs_get_acl,
1326         .set_acl        = f2fs_set_acl,
1327         .listxattr      = f2fs_listxattr,
1328 };
1329 

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