1 /* * This file is part of UBIFS.
3 * Copyright (C) 2006-2008 Nokia Corporation.
4 * Copyright (C) 2006, 2007 University of Szeged, Hungary
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Authors: Artem Bityutskiy (Битюцкий Артём)
25 * This file implements directory operations.
27 * All FS operations in this file allocate budget before writing anything to the
28 * media. If they fail to allocate it, the error is returned. The only
29 * exceptions are 'ubifs_unlink()' and 'ubifs_rmdir()' which keep working even
30 * if they unable to allocate the budget, because deletion %-ENOSPC failure is
31 * not what users are usually ready to get. UBIFS budgeting subsystem has some
32 * space reserved for these purposes.
34 * All operations in this file write all inodes which they change straight
35 * away, instead of marking them dirty. For example, 'ubifs_link()' changes
36 * @i_size of the parent inode and writes the parent inode together with the
37 * target inode. This was done to simplify file-system recovery which would
38 * otherwise be very difficult to do. The only exception is rename which marks
39 * the re-named inode dirty (because its @i_ctime is updated) but does not
40 * write it, but just marks it as dirty.
46 * inherit_flags - inherit flags of the parent inode.
48 * @mode: new inode mode flags
50 * This is a helper function for 'ubifs_new_inode()' which inherits flag of the
51 * parent directory inode @dir. UBIFS inodes inherit the following flags:
52 * o %UBIFS_COMPR_FL, which is useful to switch compression on/of on
53 * sub-directory basis;
54 * o %UBIFS_SYNC_FL - useful for the same reasons;
55 * o %UBIFS_DIRSYNC_FL - similar, but relevant only to directories.
57 * This function returns the inherited flags.
59 static int inherit_flags(const struct inode *dir, umode_t mode)
62 const struct ubifs_inode *ui = ubifs_inode(dir);
64 if (!S_ISDIR(dir->i_mode))
66 * The parent is not a directory, which means that an extended
67 * attribute inode is being created. No flags.
71 flags = ui->flags & (UBIFS_COMPR_FL | UBIFS_SYNC_FL | UBIFS_DIRSYNC_FL);
73 /* The "DIRSYNC" flag only applies to directories */
74 flags &= ~UBIFS_DIRSYNC_FL;
79 * ubifs_new_inode - allocate new UBIFS inode object.
80 * @c: UBIFS file-system description object
81 * @dir: parent directory inode
82 * @mode: inode mode flags
84 * This function finds an unused inode number, allocates new inode and
85 * initializes it. Returns new inode in case of success and an error code in
88 struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir,
93 struct ubifs_inode *ui;
94 bool encrypted = false;
96 if (ubifs_crypt_is_encrypted(dir)) {
97 err = fscrypt_get_encryption_info(dir);
99 ubifs_err(c, "fscrypt_get_encryption_info failed: %i", err);
103 if (!fscrypt_has_encryption_key(dir))
104 return ERR_PTR(-EPERM);
109 inode = new_inode(c->vfs_sb);
110 ui = ubifs_inode(inode);
112 return ERR_PTR(-ENOMEM);
115 * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and
116 * marking them dirty in file write path (see 'file_update_time()').
117 * UBIFS has to fully control "clean <-> dirty" transitions of inodes
118 * to make budgeting work.
120 inode->i_flags |= S_NOCMTIME;
122 inode_init_owner(inode, dir, mode);
123 inode->i_mtime = inode->i_atime = inode->i_ctime =
124 ubifs_current_time(inode);
125 inode->i_mapping->nrpages = 0;
127 switch (mode & S_IFMT) {
129 inode->i_mapping->a_ops = &ubifs_file_address_operations;
130 inode->i_op = &ubifs_file_inode_operations;
131 inode->i_fop = &ubifs_file_operations;
134 inode->i_op = &ubifs_dir_inode_operations;
135 inode->i_fop = &ubifs_dir_operations;
136 inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ;
139 inode->i_op = &ubifs_symlink_inode_operations;
145 inode->i_op = &ubifs_file_inode_operations;
151 ui->flags = inherit_flags(dir, mode);
152 ubifs_set_inode_flags(inode);
154 ui->compr_type = c->default_compr;
156 ui->compr_type = UBIFS_COMPR_NONE;
157 ui->synced_i_size = 0;
159 spin_lock(&c->cnt_lock);
160 /* Inode number overflow is currently not supported */
161 if (c->highest_inum >= INUM_WARN_WATERMARK) {
162 if (c->highest_inum >= INUM_WATERMARK) {
163 spin_unlock(&c->cnt_lock);
164 ubifs_err(c, "out of inode numbers");
165 make_bad_inode(inode);
167 return ERR_PTR(-EINVAL);
169 ubifs_warn(c, "running out of inode numbers (current %lu, max %u)",
170 (unsigned long)c->highest_inum, INUM_WATERMARK);
173 inode->i_ino = ++c->highest_inum;
175 * The creation sequence number remains with this inode for its
176 * lifetime. All nodes for this inode have a greater sequence number,
177 * and so it is possible to distinguish obsolete nodes belonging to a
178 * previous incarnation of the same inode number - for example, for the
179 * purpose of rebuilding the index.
181 ui->creat_sqnum = ++c->max_sqnum;
182 spin_unlock(&c->cnt_lock);
185 err = fscrypt_inherit_context(dir, inode, &encrypted, true);
187 ubifs_err(c, "fscrypt_inherit_context failed: %i", err);
188 make_bad_inode(inode);
197 static int dbg_check_name(const struct ubifs_info *c,
198 const struct ubifs_dent_node *dent,
199 const struct fscrypt_name *nm)
201 if (!dbg_is_chk_gen(c))
203 if (le16_to_cpu(dent->nlen) != fname_len(nm))
205 if (memcmp(dent->name, fname_name(nm), fname_len(nm)))
210 static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
215 struct inode *inode = NULL;
216 struct ubifs_dent_node *dent;
217 struct ubifs_info *c = dir->i_sb->s_fs_info;
218 struct fscrypt_name nm;
220 dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
222 if (ubifs_crypt_is_encrypted(dir)) {
223 err = fscrypt_get_encryption_info(dir);
226 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
227 * created while the directory was encrypted and we
228 * have access to the key.
230 if (fscrypt_has_encryption_key(dir))
231 fscrypt_set_encrypted_dentry(dentry);
232 fscrypt_set_d_op(dentry);
233 if (err && err != -ENOKEY)
237 err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
241 if (fname_len(&nm) > UBIFS_MAX_NLEN) {
246 dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
253 ubifs_assert(fname_len(&nm) == 0);
254 ubifs_assert(fname_name(&nm) == NULL);
255 dent_key_init_hash(c, &key, dir->i_ino, nm.hash);
256 err = ubifs_tnc_lookup(c, &key, dent);
258 dent_key_init(c, &key, dir->i_ino, &nm);
259 err = ubifs_tnc_lookup_nm(c, &key, dent, &nm);
263 if (err == -ENOENT) {
264 dbg_gen("not found");
270 if (dbg_check_name(c, dent, &nm)) {
275 inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
278 * This should not happen. Probably the file-system needs
281 err = PTR_ERR(inode);
282 ubifs_err(c, "dead directory entry '%pd', error %d",
284 ubifs_ro_mode(c, err);
290 fscrypt_free_filename(&nm);
292 * Note, d_splice_alias() would be required instead if we supported
295 d_add(dentry, inode);
301 fscrypt_free_filename(&nm);
305 static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
309 struct ubifs_info *c = dir->i_sb->s_fs_info;
310 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
312 struct ubifs_inode *dir_ui = ubifs_inode(dir);
313 struct fscrypt_name nm;
317 * Budget request settings: new inode, new direntry, changing the
318 * parent directory inode.
321 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
322 dentry, mode, dir->i_ino);
324 err = ubifs_budget_space(c, &req);
328 err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
332 sz_change = CALC_DENT_SIZE(fname_len(&nm));
334 inode = ubifs_new_inode(c, dir, mode);
336 err = PTR_ERR(inode);
340 err = ubifs_init_security(dir, inode, &dentry->d_name);
344 mutex_lock(&dir_ui->ui_mutex);
345 dir->i_size += sz_change;
346 dir_ui->ui_size = dir->i_size;
347 dir->i_mtime = dir->i_ctime = inode->i_ctime;
348 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
351 mutex_unlock(&dir_ui->ui_mutex);
353 ubifs_release_budget(c, &req);
354 fscrypt_free_filename(&nm);
355 insert_inode_hash(inode);
356 d_instantiate(dentry, inode);
360 dir->i_size -= sz_change;
361 dir_ui->ui_size = dir->i_size;
362 mutex_unlock(&dir_ui->ui_mutex);
364 make_bad_inode(inode);
367 fscrypt_free_filename(&nm);
369 ubifs_release_budget(c, &req);
370 ubifs_err(c, "cannot create regular file, error %d", err);
374 static int do_tmpfile(struct inode *dir, struct dentry *dentry,
375 umode_t mode, struct inode **whiteout)
378 struct ubifs_info *c = dir->i_sb->s_fs_info;
379 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1};
380 struct ubifs_budget_req ino_req = { .dirtied_ino = 1 };
381 struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir);
382 int err, instantiated = 0;
383 struct fscrypt_name nm;
386 * Budget request settings: new dirty inode, new direntry,
387 * budget for dirtied inode will be released via writeback.
390 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
391 dentry, mode, dir->i_ino);
393 if (ubifs_crypt_is_encrypted(dir)) {
394 err = fscrypt_get_encryption_info(dir);
398 if (!fscrypt_has_encryption_key(dir)) {
403 err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
407 err = ubifs_budget_space(c, &req);
409 fscrypt_free_filename(&nm);
413 err = ubifs_budget_space(c, &ino_req);
415 ubifs_release_budget(c, &req);
416 fscrypt_free_filename(&nm);
420 inode = ubifs_new_inode(c, dir, mode);
422 err = PTR_ERR(inode);
425 ui = ubifs_inode(inode);
428 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
429 ubifs_assert(inode->i_op == &ubifs_file_inode_operations);
432 err = ubifs_init_security(dir, inode, &dentry->d_name);
436 mutex_lock(&ui->ui_mutex);
437 insert_inode_hash(inode);
440 mark_inode_dirty(inode);
444 d_tmpfile(dentry, inode);
446 ubifs_assert(ui->dirty);
449 mutex_unlock(&ui->ui_mutex);
451 mutex_lock(&dir_ui->ui_mutex);
452 err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
455 mutex_unlock(&dir_ui->ui_mutex);
457 ubifs_release_budget(c, &req);
462 mutex_unlock(&dir_ui->ui_mutex);
464 make_bad_inode(inode);
468 ubifs_release_budget(c, &req);
470 ubifs_release_budget(c, &ino_req);
471 fscrypt_free_filename(&nm);
472 ubifs_err(c, "cannot create temporary file, error %d", err);
476 static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry,
479 return do_tmpfile(dir, dentry, mode, NULL);
483 * vfs_dent_type - get VFS directory entry type.
484 * @type: UBIFS directory entry type
486 * This function converts UBIFS directory entry type into VFS directory entry
489 static unsigned int vfs_dent_type(uint8_t type)
492 case UBIFS_ITYPE_REG:
494 case UBIFS_ITYPE_DIR:
496 case UBIFS_ITYPE_LNK:
498 case UBIFS_ITYPE_BLK:
500 case UBIFS_ITYPE_CHR:
502 case UBIFS_ITYPE_FIFO:
504 case UBIFS_ITYPE_SOCK:
513 * The classical Unix view for directory is that it is a linear array of
514 * (name, inode number) entries. Linux/VFS assumes this model as well.
515 * Particularly, 'readdir()' call wants us to return a directory entry offset
516 * which later may be used to continue 'readdir()'ing the directory or to
517 * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this
518 * model because directory entries are identified by keys, which may collide.
520 * UBIFS uses directory entry hash value for directory offsets, so
521 * 'seekdir()'/'telldir()' may not always work because of possible key
522 * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work
523 * properly by means of saving full directory entry name in the private field
524 * of the file description object.
526 * This means that UBIFS cannot support NFS which requires full
527 * 'seekdir()'/'telldir()' support.
529 static int ubifs_readdir(struct file *file, struct dir_context *ctx)
531 int fstr_real_len, err = 0;
532 struct fscrypt_name nm;
533 struct fscrypt_str fstr = {0};
535 struct ubifs_dent_node *dent;
536 struct inode *dir = file_inode(file);
537 struct ubifs_info *c = dir->i_sb->s_fs_info;
538 bool encrypted = ubifs_crypt_is_encrypted(dir);
540 dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos);
542 if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2)
544 * The directory was seek'ed to a senseless position or there
545 * are no more entries.
550 err = fscrypt_get_encryption_info(dir);
551 if (err && err != -ENOKEY)
554 err = fscrypt_fname_alloc_buffer(dir, UBIFS_MAX_NLEN, &fstr);
558 fstr_real_len = fstr.len;
561 if (file->f_version == 0) {
563 * The file was seek'ed, which means that @file->private_data
564 * is now invalid. This may also be just the first
565 * 'ubifs_readdir()' invocation, in which case
566 * @file->private_data is NULL, and the below code is
569 kfree(file->private_data);
570 file->private_data = NULL;
574 * 'generic_file_llseek()' unconditionally sets @file->f_version to
575 * zero, and we use this for detecting whether the file was seek'ed.
579 /* File positions 0 and 1 correspond to "." and ".." */
581 ubifs_assert(!file->private_data);
582 if (!dir_emit_dots(file, ctx)) {
584 fscrypt_fname_free_buffer(&fstr);
588 /* Find the first entry in TNC and save it */
589 lowest_dent_key(c, &key, dir->i_ino);
591 dent = ubifs_tnc_next_ent(c, &key, &nm);
597 ctx->pos = key_hash_flash(c, &dent->key);
598 file->private_data = dent;
601 dent = file->private_data;
604 * The directory was seek'ed to and is now readdir'ed.
605 * Find the entry corresponding to @ctx->pos or the closest one.
607 dent_key_init_hash(c, &key, dir->i_ino, ctx->pos);
609 dent = ubifs_tnc_next_ent(c, &key, &nm);
614 ctx->pos = key_hash_flash(c, &dent->key);
615 file->private_data = dent;
619 dbg_gen("feed '%s', ino %llu, new f_pos %#x",
620 dent->name, (unsigned long long)le64_to_cpu(dent->inum),
621 key_hash_flash(c, &dent->key));
622 ubifs_assert(le64_to_cpu(dent->ch.sqnum) >
623 ubifs_inode(dir)->creat_sqnum);
625 fname_len(&nm) = le16_to_cpu(dent->nlen);
626 fname_name(&nm) = dent->name;
629 fstr.len = fstr_real_len;
631 err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c, &dent->key), 0, &nm.disk_name, &fstr);
635 fstr.len = fname_len(&nm);
636 fstr.name = fname_name(&nm);
639 if (!dir_emit(ctx, fstr.name, fstr.len,
640 le64_to_cpu(dent->inum),
641 vfs_dent_type(dent->type))) {
643 fscrypt_fname_free_buffer(&fstr);
647 /* Switch to the next entry */
648 key_read(c, &dent->key, &key);
649 dent = ubifs_tnc_next_ent(c, &key, &nm);
655 kfree(file->private_data);
656 ctx->pos = key_hash_flash(c, &dent->key);
657 file->private_data = dent;
662 kfree(file->private_data);
663 file->private_data = NULL;
666 fscrypt_fname_free_buffer(&fstr);
669 ubifs_err(c, "cannot find next direntry, error %d", err);
672 * -ENOENT is a non-fatal error in this context, the TNC uses
673 * it to indicate that the cursor moved past the current directory
674 * and readdir() has to stop.
679 /* 2 is a special value indicating that there are no more direntries */
684 /* Free saved readdir() state when the directory is closed */
685 static int ubifs_dir_release(struct inode *dir, struct file *file)
687 kfree(file->private_data);
688 file->private_data = NULL;
693 * lock_2_inodes - a wrapper for locking two UBIFS inodes.
694 * @inode1: first inode
695 * @inode2: second inode
697 * We do not implement any tricks to guarantee strict lock ordering, because
698 * VFS has already done it for us on the @i_mutex. So this is just a simple
701 static void lock_2_inodes(struct inode *inode1, struct inode *inode2)
703 mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
704 mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
708 * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes.
709 * @inode1: first inode
710 * @inode2: second inode
712 static void unlock_2_inodes(struct inode *inode1, struct inode *inode2)
714 mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
715 mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
718 static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
719 struct dentry *dentry)
721 struct ubifs_info *c = dir->i_sb->s_fs_info;
722 struct inode *inode = d_inode(old_dentry);
723 struct ubifs_inode *ui = ubifs_inode(inode);
724 struct ubifs_inode *dir_ui = ubifs_inode(dir);
725 int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
726 struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2,
727 .dirtied_ino_d = ALIGN(ui->data_len, 8) };
728 struct fscrypt_name nm;
731 * Budget request settings: new direntry, changing the target inode,
732 * changing the parent inode.
735 dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu",
736 dentry, inode->i_ino,
737 inode->i_nlink, dir->i_ino);
738 ubifs_assert(inode_is_locked(dir));
739 ubifs_assert(inode_is_locked(inode));
741 if (ubifs_crypt_is_encrypted(dir)) {
742 if (!fscrypt_has_permitted_context(dir, inode))
745 err = fscrypt_get_encryption_info(inode);
749 if (!fscrypt_has_encryption_key(inode))
753 err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
757 err = dbg_check_synced_i_size(c, inode);
761 err = ubifs_budget_space(c, &req);
765 lock_2_inodes(dir, inode);
768 inode->i_ctime = ubifs_current_time(inode);
769 dir->i_size += sz_change;
770 dir_ui->ui_size = dir->i_size;
771 dir->i_mtime = dir->i_ctime = inode->i_ctime;
772 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
775 unlock_2_inodes(dir, inode);
777 ubifs_release_budget(c, &req);
778 d_instantiate(dentry, inode);
779 fscrypt_free_filename(&nm);
783 dir->i_size -= sz_change;
784 dir_ui->ui_size = dir->i_size;
786 unlock_2_inodes(dir, inode);
787 ubifs_release_budget(c, &req);
790 fscrypt_free_filename(&nm);
794 static int ubifs_unlink(struct inode *dir, struct dentry *dentry)
796 struct ubifs_info *c = dir->i_sb->s_fs_info;
797 struct inode *inode = d_inode(dentry);
798 struct ubifs_inode *dir_ui = ubifs_inode(dir);
799 int err, sz_change, budgeted = 1;
800 struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
801 unsigned int saved_nlink = inode->i_nlink;
802 struct fscrypt_name nm;
805 * Budget request settings: deletion direntry, deletion inode (+1 for
806 * @dirtied_ino), changing the parent directory inode. If budgeting
807 * fails, go ahead anyway because we have extra space reserved for
811 dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu",
812 dentry, inode->i_ino,
813 inode->i_nlink, dir->i_ino);
815 if (ubifs_crypt_is_encrypted(dir)) {
816 err = fscrypt_get_encryption_info(dir);
817 if (err && err != -ENOKEY)
821 err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
825 sz_change = CALC_DENT_SIZE(fname_len(&nm));
827 ubifs_assert(inode_is_locked(dir));
828 ubifs_assert(inode_is_locked(inode));
829 err = dbg_check_synced_i_size(c, inode);
833 err = ubifs_budget_space(c, &req);
840 lock_2_inodes(dir, inode);
841 inode->i_ctime = ubifs_current_time(dir);
843 dir->i_size -= sz_change;
844 dir_ui->ui_size = dir->i_size;
845 dir->i_mtime = dir->i_ctime = inode->i_ctime;
846 err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
849 unlock_2_inodes(dir, inode);
852 ubifs_release_budget(c, &req);
854 /* We've deleted something - clean the "no space" flags */
855 c->bi.nospace = c->bi.nospace_rp = 0;
858 fscrypt_free_filename(&nm);
862 dir->i_size += sz_change;
863 dir_ui->ui_size = dir->i_size;
864 set_nlink(inode, saved_nlink);
865 unlock_2_inodes(dir, inode);
867 ubifs_release_budget(c, &req);
869 fscrypt_free_filename(&nm);
874 * check_dir_empty - check if a directory is empty or not.
875 * @dir: VFS inode object of the directory to check
877 * This function checks if directory @dir is empty. Returns zero if the
878 * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes
879 * in case of of errors.
881 int ubifs_check_dir_empty(struct inode *dir)
883 struct ubifs_info *c = dir->i_sb->s_fs_info;
884 struct fscrypt_name nm = { 0 };
885 struct ubifs_dent_node *dent;
889 lowest_dent_key(c, &key, dir->i_ino);
890 dent = ubifs_tnc_next_ent(c, &key, &nm);
902 static int ubifs_rmdir(struct inode *dir, struct dentry *dentry)
904 struct ubifs_info *c = dir->i_sb->s_fs_info;
905 struct inode *inode = d_inode(dentry);
906 int err, sz_change, budgeted = 1;
907 struct ubifs_inode *dir_ui = ubifs_inode(dir);
908 struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
909 struct fscrypt_name nm;
912 * Budget request settings: deletion direntry, deletion inode and
913 * changing the parent inode. If budgeting fails, go ahead anyway
914 * because we have extra space reserved for deletions.
917 dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry,
918 inode->i_ino, dir->i_ino);
919 ubifs_assert(inode_is_locked(dir));
920 ubifs_assert(inode_is_locked(inode));
921 err = ubifs_check_dir_empty(d_inode(dentry));
925 if (ubifs_crypt_is_encrypted(dir)) {
926 err = fscrypt_get_encryption_info(dir);
927 if (err && err != -ENOKEY)
931 err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
935 sz_change = CALC_DENT_SIZE(fname_len(&nm));
937 err = ubifs_budget_space(c, &req);
944 lock_2_inodes(dir, inode);
945 inode->i_ctime = ubifs_current_time(dir);
948 dir->i_size -= sz_change;
949 dir_ui->ui_size = dir->i_size;
950 dir->i_mtime = dir->i_ctime = inode->i_ctime;
951 err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
954 unlock_2_inodes(dir, inode);
957 ubifs_release_budget(c, &req);
959 /* We've deleted something - clean the "no space" flags */
960 c->bi.nospace = c->bi.nospace_rp = 0;
963 fscrypt_free_filename(&nm);
967 dir->i_size += sz_change;
968 dir_ui->ui_size = dir->i_size;
971 unlock_2_inodes(dir, inode);
973 ubifs_release_budget(c, &req);
975 fscrypt_free_filename(&nm);
979 static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
982 struct ubifs_inode *dir_ui = ubifs_inode(dir);
983 struct ubifs_info *c = dir->i_sb->s_fs_info;
985 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 };
986 struct fscrypt_name nm;
989 * Budget request settings: new inode, new direntry and changing parent
993 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
994 dentry, mode, dir->i_ino);
996 err = ubifs_budget_space(c, &req);
1000 if (ubifs_crypt_is_encrypted(dir)) {
1001 err = fscrypt_get_encryption_info(dir);
1005 if (!fscrypt_has_encryption_key(dir)) {
1011 err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
1015 sz_change = CALC_DENT_SIZE(fname_len(&nm));
1017 inode = ubifs_new_inode(c, dir, S_IFDIR | mode);
1018 if (IS_ERR(inode)) {
1019 err = PTR_ERR(inode);
1023 err = ubifs_init_security(dir, inode, &dentry->d_name);
1027 mutex_lock(&dir_ui->ui_mutex);
1028 insert_inode_hash(inode);
1031 dir->i_size += sz_change;
1032 dir_ui->ui_size = dir->i_size;
1033 dir->i_mtime = dir->i_ctime = inode->i_ctime;
1034 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
1036 ubifs_err(c, "cannot create directory, error %d", err);
1039 mutex_unlock(&dir_ui->ui_mutex);
1041 ubifs_release_budget(c, &req);
1042 d_instantiate(dentry, inode);
1043 fscrypt_free_filename(&nm);
1047 dir->i_size -= sz_change;
1048 dir_ui->ui_size = dir->i_size;
1050 mutex_unlock(&dir_ui->ui_mutex);
1052 make_bad_inode(inode);
1055 fscrypt_free_filename(&nm);
1057 ubifs_release_budget(c, &req);
1061 static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
1062 umode_t mode, dev_t rdev)
1064 struct inode *inode;
1065 struct ubifs_inode *ui;
1066 struct ubifs_inode *dir_ui = ubifs_inode(dir);
1067 struct ubifs_info *c = dir->i_sb->s_fs_info;
1068 union ubifs_dev_desc *dev = NULL;
1070 int err, devlen = 0;
1071 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
1072 .new_ino_d = ALIGN(devlen, 8),
1074 struct fscrypt_name nm;
1077 * Budget request settings: new inode, new direntry and changing parent
1081 dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino);
1083 if (S_ISBLK(mode) || S_ISCHR(mode)) {
1084 dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
1087 devlen = ubifs_encode_dev(dev, rdev);
1090 err = ubifs_budget_space(c, &req);
1096 if (ubifs_crypt_is_encrypted(dir)) {
1097 err = fscrypt_get_encryption_info(dir);
1101 if (!fscrypt_has_encryption_key(dir)) {
1107 err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
1111 sz_change = CALC_DENT_SIZE(fname_len(&nm));
1113 inode = ubifs_new_inode(c, dir, mode);
1114 if (IS_ERR(inode)) {
1116 err = PTR_ERR(inode);
1120 init_special_inode(inode, inode->i_mode, rdev);
1121 inode->i_size = ubifs_inode(inode)->ui_size = devlen;
1122 ui = ubifs_inode(inode);
1124 ui->data_len = devlen;
1126 err = ubifs_init_security(dir, inode, &dentry->d_name);
1130 mutex_lock(&dir_ui->ui_mutex);
1131 dir->i_size += sz_change;
1132 dir_ui->ui_size = dir->i_size;
1133 dir->i_mtime = dir->i_ctime = inode->i_ctime;
1134 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
1137 mutex_unlock(&dir_ui->ui_mutex);
1139 ubifs_release_budget(c, &req);
1140 insert_inode_hash(inode);
1141 d_instantiate(dentry, inode);
1142 fscrypt_free_filename(&nm);
1146 dir->i_size -= sz_change;
1147 dir_ui->ui_size = dir->i_size;
1148 mutex_unlock(&dir_ui->ui_mutex);
1150 make_bad_inode(inode);
1153 fscrypt_free_filename(&nm);
1155 ubifs_release_budget(c, &req);
1159 static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
1160 const char *symname)
1162 struct inode *inode;
1163 struct ubifs_inode *ui;
1164 struct ubifs_inode *dir_ui = ubifs_inode(dir);
1165 struct ubifs_info *c = dir->i_sb->s_fs_info;
1166 int err, len = strlen(symname);
1167 int sz_change = CALC_DENT_SIZE(len);
1168 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
1169 struct fscrypt_symlink_data *sd = NULL;
1170 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
1171 .new_ino_d = ALIGN(len, 8),
1173 struct fscrypt_name nm;
1175 if (ubifs_crypt_is_encrypted(dir)) {
1176 err = fscrypt_get_encryption_info(dir);
1180 if (!fscrypt_has_encryption_key(dir)) {
1185 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
1186 sizeof(struct fscrypt_symlink_data));
1190 * Budget request settings: new inode, new direntry and changing parent
1194 dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
1195 symname, dir->i_ino);
1197 if (disk_link.len > UBIFS_MAX_INO_DATA)
1198 return -ENAMETOOLONG;
1200 err = ubifs_budget_space(c, &req);
1204 err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
1208 inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO);
1209 if (IS_ERR(inode)) {
1210 err = PTR_ERR(inode);
1214 ui = ubifs_inode(inode);
1215 ui->data = kmalloc(disk_link.len, GFP_NOFS);
1221 if (ubifs_crypt_is_encrypted(dir)) {
1222 struct qstr istr = QSTR_INIT(symname, len);
1223 struct fscrypt_str ostr;
1225 sd = kzalloc(disk_link.len, GFP_NOFS);
1231 err = fscrypt_get_encryption_info(inode);
1237 if (!fscrypt_has_encryption_key(inode)) {
1243 ostr.name = sd->encrypted_path;
1244 ostr.len = disk_link.len;
1246 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
1252 sd->len = cpu_to_le16(ostr.len);
1253 disk_link.name = (char *)sd;
1255 inode->i_link = ui->data;
1258 memcpy(ui->data, disk_link.name, disk_link.len);
1259 ((char *)ui->data)[disk_link.len - 1] = '\0';
1262 * The terminating zero byte is not written to the flash media and it
1263 * is put just to make later in-memory string processing simpler. Thus,
1264 * data length is @len, not @len + %1.
1266 ui->data_len = disk_link.len - 1;
1267 inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1;
1269 err = ubifs_init_security(dir, inode, &dentry->d_name);
1273 mutex_lock(&dir_ui->ui_mutex);
1274 dir->i_size += sz_change;
1275 dir_ui->ui_size = dir->i_size;
1276 dir->i_mtime = dir->i_ctime = inode->i_ctime;
1277 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
1280 mutex_unlock(&dir_ui->ui_mutex);
1282 ubifs_release_budget(c, &req);
1283 insert_inode_hash(inode);
1284 d_instantiate(dentry, inode);
1285 fscrypt_free_filename(&nm);
1289 dir->i_size -= sz_change;
1290 dir_ui->ui_size = dir->i_size;
1291 mutex_unlock(&dir_ui->ui_mutex);
1293 make_bad_inode(inode);
1296 fscrypt_free_filename(&nm);
1298 ubifs_release_budget(c, &req);
1303 * lock_4_inodes - a wrapper for locking three UBIFS inodes.
1304 * @inode1: first inode
1305 * @inode2: second inode
1306 * @inode3: third inode
1307 * @inode4: fouth inode
1309 * This function is used for 'ubifs_rename()' and @inode1 may be the same as
1310 * @inode2 whereas @inode3 and @inode4 may be %NULL.
1312 * We do not implement any tricks to guarantee strict lock ordering, because
1313 * VFS has already done it for us on the @i_mutex. So this is just a simple
1316 static void lock_4_inodes(struct inode *inode1, struct inode *inode2,
1317 struct inode *inode3, struct inode *inode4)
1319 mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
1320 if (inode2 != inode1)
1321 mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
1323 mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
1325 mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4);
1329 * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename.
1330 * @inode1: first inode
1331 * @inode2: second inode
1332 * @inode3: third inode
1333 * @inode4: fouth inode
1335 static void unlock_4_inodes(struct inode *inode1, struct inode *inode2,
1336 struct inode *inode3, struct inode *inode4)
1339 mutex_unlock(&ubifs_inode(inode4)->ui_mutex);
1341 mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
1342 if (inode1 != inode2)
1343 mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
1344 mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
1347 static int do_rename(struct inode *old_dir, struct dentry *old_dentry,
1348 struct inode *new_dir, struct dentry *new_dentry,
1351 struct ubifs_info *c = old_dir->i_sb->s_fs_info;
1352 struct inode *old_inode = d_inode(old_dentry);
1353 struct inode *new_inode = d_inode(new_dentry);
1354 struct inode *whiteout = NULL;
1355 struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
1356 struct ubifs_inode *whiteout_ui = NULL;
1357 int err, release, sync = 0, move = (new_dir != old_dir);
1358 int is_dir = S_ISDIR(old_inode->i_mode);
1359 int unlink = !!new_inode, new_sz, old_sz;
1360 struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
1362 struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
1363 .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
1364 struct timespec time;
1365 unsigned int uninitialized_var(saved_nlink);
1366 struct fscrypt_name old_nm, new_nm;
1368 if (flags & ~RENAME_NOREPLACE)
1372 * Budget request settings: deletion direntry, new direntry, removing
1373 * the old inode, and changing old and new parent directory inodes.
1375 * However, this operation also marks the target inode as dirty and
1376 * does not write it, so we allocate budget for the target inode
1380 dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x",
1381 old_dentry, old_inode->i_ino, old_dir->i_ino,
1382 new_dentry, new_dir->i_ino, flags);
1385 ubifs_assert(inode_is_locked(new_inode));
1387 if (old_dir != new_dir) {
1388 if (ubifs_crypt_is_encrypted(new_dir) &&
1389 !fscrypt_has_permitted_context(new_dir, old_inode))
1393 if (unlink && is_dir) {
1394 err = ubifs_check_dir_empty(new_inode);
1399 err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm);
1403 err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm);
1405 fscrypt_free_filename(&old_nm);
1409 new_sz = CALC_DENT_SIZE(fname_len(&new_nm));
1410 old_sz = CALC_DENT_SIZE(fname_len(&old_nm));
1412 err = ubifs_budget_space(c, &req);
1414 fscrypt_free_filename(&old_nm);
1415 fscrypt_free_filename(&new_nm);
1418 err = ubifs_budget_space(c, &ino_req);
1420 fscrypt_free_filename(&old_nm);
1421 fscrypt_free_filename(&new_nm);
1422 ubifs_release_budget(c, &req);
1426 if (flags & RENAME_WHITEOUT) {
1427 union ubifs_dev_desc *dev = NULL;
1429 dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
1431 ubifs_release_budget(c, &req);
1432 ubifs_release_budget(c, &ino_req);
1436 err = do_tmpfile(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE, &whiteout);
1438 ubifs_release_budget(c, &req);
1439 ubifs_release_budget(c, &ino_req);
1444 whiteout->i_state |= I_LINKABLE;
1445 whiteout_ui = ubifs_inode(whiteout);
1446 whiteout_ui->data = dev;
1447 whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0));
1448 ubifs_assert(!whiteout_ui->dirty);
1451 lock_4_inodes(old_dir, new_dir, new_inode, whiteout);
1454 * Like most other Unix systems, set the @i_ctime for inodes on a
1457 time = ubifs_current_time(old_dir);
1458 old_inode->i_ctime = time;
1460 /* We must adjust parent link count when renaming directories */
1464 * @old_dir loses a link because we are moving
1465 * @old_inode to a different directory.
1467 drop_nlink(old_dir);
1469 * @new_dir only gains a link if we are not also
1470 * overwriting an existing directory.
1476 * @old_inode is not moving to a different directory,
1477 * but @old_dir still loses a link if we are
1478 * overwriting an existing directory.
1481 drop_nlink(old_dir);
1485 old_dir->i_size -= old_sz;
1486 ubifs_inode(old_dir)->ui_size = old_dir->i_size;
1487 old_dir->i_mtime = old_dir->i_ctime = time;
1488 new_dir->i_mtime = new_dir->i_ctime = time;
1491 * And finally, if we unlinked a direntry which happened to have the
1492 * same name as the moved direntry, we have to decrement @i_nlink of
1493 * the unlinked inode and change its ctime.
1497 * Directories cannot have hard-links, so if this is a
1498 * directory, just clear @i_nlink.
1500 saved_nlink = new_inode->i_nlink;
1502 clear_nlink(new_inode);
1504 drop_nlink(new_inode);
1505 new_inode->i_ctime = time;
1507 new_dir->i_size += new_sz;
1508 ubifs_inode(new_dir)->ui_size = new_dir->i_size;
1512 * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode
1513 * is dirty, because this will be done later on at the end of
1516 if (IS_SYNC(old_inode)) {
1517 sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
1518 if (unlink && IS_SYNC(new_inode))
1523 struct ubifs_budget_req wht_req = { .dirtied_ino = 1,
1525 ALIGN(ubifs_inode(whiteout)->data_len, 8) };
1527 err = ubifs_budget_space(c, &wht_req);
1529 ubifs_release_budget(c, &req);
1530 ubifs_release_budget(c, &ino_req);
1531 kfree(whiteout_ui->data);
1532 whiteout_ui->data_len = 0;
1537 inc_nlink(whiteout);
1538 mark_inode_dirty(whiteout);
1539 whiteout->i_state &= ~I_LINKABLE;
1543 err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir,
1544 new_inode, &new_nm, whiteout, sync);
1548 unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
1549 ubifs_release_budget(c, &req);
1551 mutex_lock(&old_inode_ui->ui_mutex);
1552 release = old_inode_ui->dirty;
1553 mark_inode_dirty_sync(old_inode);
1554 mutex_unlock(&old_inode_ui->ui_mutex);
1557 ubifs_release_budget(c, &ino_req);
1558 if (IS_SYNC(old_inode))
1559 err = old_inode->i_sb->s_op->write_inode(old_inode, NULL);
1561 fscrypt_free_filename(&old_nm);
1562 fscrypt_free_filename(&new_nm);
1567 set_nlink(new_inode, saved_nlink);
1569 new_dir->i_size -= new_sz;
1570 ubifs_inode(new_dir)->ui_size = new_dir->i_size;
1572 old_dir->i_size += old_sz;
1573 ubifs_inode(old_dir)->ui_size = old_dir->i_size;
1578 drop_nlink(new_dir);
1585 drop_nlink(whiteout);
1588 unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
1589 ubifs_release_budget(c, &ino_req);
1590 ubifs_release_budget(c, &req);
1591 fscrypt_free_filename(&old_nm);
1592 fscrypt_free_filename(&new_nm);
1596 static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
1597 struct inode *new_dir, struct dentry *new_dentry)
1599 struct ubifs_info *c = old_dir->i_sb->s_fs_info;
1600 struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
1602 int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
1603 struct inode *fst_inode = d_inode(old_dentry);
1604 struct inode *snd_inode = d_inode(new_dentry);
1605 struct timespec time;
1607 struct fscrypt_name fst_nm, snd_nm;
1609 ubifs_assert(fst_inode && snd_inode);
1611 if ((ubifs_crypt_is_encrypted(old_dir) ||
1612 ubifs_crypt_is_encrypted(new_dir)) &&
1613 (old_dir != new_dir) &&
1614 (!fscrypt_has_permitted_context(new_dir, fst_inode) ||
1615 !fscrypt_has_permitted_context(old_dir, snd_inode)))
1618 err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm);
1622 err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm);
1624 fscrypt_free_filename(&fst_nm);
1628 lock_4_inodes(old_dir, new_dir, NULL, NULL);
1630 time = ubifs_current_time(old_dir);
1631 fst_inode->i_ctime = time;
1632 snd_inode->i_ctime = time;
1633 old_dir->i_mtime = old_dir->i_ctime = time;
1634 new_dir->i_mtime = new_dir->i_ctime = time;
1636 if (old_dir != new_dir) {
1637 if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) {
1639 drop_nlink(old_dir);
1641 else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) {
1642 drop_nlink(new_dir);
1647 err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir,
1648 snd_inode, &snd_nm, sync);
1650 unlock_4_inodes(old_dir, new_dir, NULL, NULL);
1651 ubifs_release_budget(c, &req);
1653 fscrypt_free_filename(&fst_nm);
1654 fscrypt_free_filename(&snd_nm);
1658 static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
1659 struct inode *new_dir, struct dentry *new_dentry,
1662 if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE))
1665 ubifs_assert(inode_is_locked(old_dir));
1666 ubifs_assert(inode_is_locked(new_dir));
1668 if (flags & RENAME_EXCHANGE)
1669 return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry);
1671 return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1674 int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1678 struct inode *inode = d_inode(dentry);
1679 struct ubifs_inode *ui = ubifs_inode(inode);
1681 mutex_lock(&ui->ui_mutex);
1682 generic_fillattr(inode, stat);
1683 stat->blksize = UBIFS_BLOCK_SIZE;
1684 stat->size = ui->ui_size;
1687 * Unfortunately, the 'stat()' system call was designed for block
1688 * device based file systems, and it is not appropriate for UBIFS,
1689 * because UBIFS does not have notion of "block". For example, it is
1690 * difficult to tell how many block a directory takes - it actually
1691 * takes less than 300 bytes, but we have to round it to block size,
1692 * which introduces large mistake. This makes utilities like 'du' to
1693 * report completely senseless numbers. This is the reason why UBIFS
1694 * goes the same way as JFFS2 - it reports zero blocks for everything
1695 * but regular files, which makes more sense than reporting completely
1698 if (S_ISREG(inode->i_mode)) {
1699 size = ui->xattr_size;
1701 size = ALIGN(size, UBIFS_BLOCK_SIZE);
1703 * Note, user-space expects 512-byte blocks count irrespectively
1704 * of what was reported in @stat->size.
1706 stat->blocks = size >> 9;
1709 mutex_unlock(&ui->ui_mutex);
1713 static int ubifs_dir_open(struct inode *dir, struct file *file)
1715 if (ubifs_crypt_is_encrypted(dir))
1716 return fscrypt_get_encryption_info(dir) ? -EACCES : 0;
1721 const struct inode_operations ubifs_dir_inode_operations = {
1722 .lookup = ubifs_lookup,
1723 .create = ubifs_create,
1725 .symlink = ubifs_symlink,
1726 .unlink = ubifs_unlink,
1727 .mkdir = ubifs_mkdir,
1728 .rmdir = ubifs_rmdir,
1729 .mknod = ubifs_mknod,
1730 .rename = ubifs_rename,
1731 .setattr = ubifs_setattr,
1732 .getattr = ubifs_getattr,
1733 .listxattr = ubifs_listxattr,
1734 #ifdef CONFIG_UBIFS_ATIME_SUPPORT
1735 .update_time = ubifs_update_time,
1737 .tmpfile = ubifs_tmpfile,
1740 const struct file_operations ubifs_dir_operations = {
1741 .llseek = generic_file_llseek,
1742 .release = ubifs_dir_release,
1743 .read = generic_read_dir,
1744 .iterate_shared = ubifs_readdir,
1745 .fsync = ubifs_fsync,
1746 .unlocked_ioctl = ubifs_ioctl,
1747 .open = ubifs_dir_open,
1748 #ifdef CONFIG_COMPAT
1749 .compat_ioctl = ubifs_compat_ioctl,