1 // SPDX-License-Identifier: GPL-2.0-only
2 /* * This file is part of UBIFS.
4 * Copyright (C) 2006-2008 Nokia Corporation.
5 * Copyright (C) 2006, 2007 University of Szeged, Hungary
7 * Authors: Artem Bityutskiy (Битюцкий Артём)
13 * This file implements directory operations.
15 * All FS operations in this file allocate budget before writing anything to the
16 * media. If they fail to allocate it, the error is returned. The only
17 * exceptions are 'ubifs_unlink()' and 'ubifs_rmdir()' which keep working even
18 * if they unable to allocate the budget, because deletion %-ENOSPC failure is
19 * not what users are usually ready to get. UBIFS budgeting subsystem has some
20 * space reserved for these purposes.
22 * All operations in this file write all inodes which they change straight
23 * away, instead of marking them dirty. For example, 'ubifs_link()' changes
24 * @i_size of the parent inode and writes the parent inode together with the
25 * target inode. This was done to simplify file-system recovery which would
26 * otherwise be very difficult to do. The only exception is rename which marks
27 * the re-named inode dirty (because its @i_ctime is updated) but does not
28 * write it, but just marks it as dirty.
34 * inherit_flags - inherit flags of the parent inode.
36 * @mode: new inode mode flags
38 * This is a helper function for 'ubifs_new_inode()' which inherits flag of the
39 * parent directory inode @dir. UBIFS inodes inherit the following flags:
40 * o %UBIFS_COMPR_FL, which is useful to switch compression on/of on
41 * sub-directory basis;
42 * o %UBIFS_SYNC_FL - useful for the same reasons;
43 * o %UBIFS_DIRSYNC_FL - similar, but relevant only to directories.
45 * This function returns the inherited flags.
47 static int inherit_flags(const struct inode *dir, umode_t mode)
50 const struct ubifs_inode *ui = ubifs_inode(dir);
52 if (!S_ISDIR(dir->i_mode))
54 * The parent is not a directory, which means that an extended
55 * attribute inode is being created. No flags.
59 flags = ui->flags & (UBIFS_COMPR_FL | UBIFS_SYNC_FL | UBIFS_DIRSYNC_FL);
61 /* The "DIRSYNC" flag only applies to directories */
62 flags &= ~UBIFS_DIRSYNC_FL;
67 * ubifs_new_inode - allocate new UBIFS inode object.
68 * @c: UBIFS file-system description object
69 * @dir: parent directory inode
70 * @mode: inode mode flags
71 * @is_xattr: whether the inode is xattr inode
73 * This function finds an unused inode number, allocates new inode and
74 * initializes it. Non-xattr new inode may be written with xattrs(selinux/
75 * encryption) before writing dentry, which could cause inconsistent problem
76 * when powercut happens between two operations. To deal with it, non-xattr
77 * new inode is initialized with zero-nlink and added into orphan list, caller
78 * should make sure that inode is relinked later, and make sure that orphan
79 * removing and journal writing into an committing atomic operation. Returns
80 * new inode in case of success and an error code in case of failure.
82 struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir,
83 umode_t mode, bool is_xattr)
87 struct ubifs_inode *ui;
88 bool encrypted = false;
90 inode = new_inode(c->vfs_sb);
91 ui = ubifs_inode(inode);
93 return ERR_PTR(-ENOMEM);
96 * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and
97 * marking them dirty in file write path (see 'file_update_time()').
98 * UBIFS has to fully control "clean <-> dirty" transitions of inodes
99 * to make budgeting work.
101 inode->i_flags |= S_NOCMTIME;
103 inode_init_owner(&nop_mnt_idmap, inode, dir, mode);
104 simple_inode_init_ts(inode);
105 inode->i_mapping->nrpages = 0;
108 err = fscrypt_prepare_new_inode(dir, inode, &encrypted);
110 ubifs_err(c, "fscrypt_prepare_new_inode failed: %i", err);
115 switch (mode & S_IFMT) {
117 inode->i_mapping->a_ops = &ubifs_file_address_operations;
118 inode->i_op = &ubifs_file_inode_operations;
119 inode->i_fop = &ubifs_file_operations;
122 inode->i_op = &ubifs_dir_inode_operations;
123 inode->i_fop = &ubifs_dir_operations;
124 inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ;
127 inode->i_op = &ubifs_symlink_inode_operations;
133 inode->i_op = &ubifs_file_inode_operations;
139 ui->flags = inherit_flags(dir, mode);
140 ubifs_set_inode_flags(inode);
142 ui->compr_type = c->default_compr;
144 ui->compr_type = UBIFS_COMPR_NONE;
145 ui->synced_i_size = 0;
147 spin_lock(&c->cnt_lock);
148 /* Inode number overflow is currently not supported */
149 if (c->highest_inum >= INUM_WARN_WATERMARK) {
150 if (c->highest_inum >= INUM_WATERMARK) {
151 spin_unlock(&c->cnt_lock);
152 ubifs_err(c, "out of inode numbers");
156 ubifs_warn(c, "running out of inode numbers (current %lu, max %u)",
157 (unsigned long)c->highest_inum, INUM_WATERMARK);
160 inode->i_ino = ++c->highest_inum;
162 * The creation sequence number remains with this inode for its
163 * lifetime. All nodes for this inode have a greater sequence number,
164 * and so it is possible to distinguish obsolete nodes belonging to a
165 * previous incarnation of the same inode number - for example, for the
166 * purpose of rebuilding the index.
168 ui->creat_sqnum = ++c->max_sqnum;
169 spin_unlock(&c->cnt_lock);
173 err = ubifs_add_orphan(c, inode->i_ino);
175 ubifs_err(c, "ubifs_add_orphan failed: %i", err);
178 down_read(&c->commit_sem);
179 ui->del_cmtno = c->cmt_no;
180 up_read(&c->commit_sem);
184 err = fscrypt_set_context(inode, NULL);
188 ubifs_delete_orphan(c, inode->i_ino);
190 ubifs_err(c, "fscrypt_set_context failed: %i", err);
198 make_bad_inode(inode);
203 static int dbg_check_name(const struct ubifs_info *c,
204 const struct ubifs_dent_node *dent,
205 const struct fscrypt_name *nm)
207 if (!dbg_is_chk_gen(c))
209 if (le16_to_cpu(dent->nlen) != fname_len(nm))
211 if (memcmp(dent->name, fname_name(nm), fname_len(nm)))
216 static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
221 struct inode *inode = NULL;
222 struct ubifs_dent_node *dent = NULL;
223 struct ubifs_info *c = dir->i_sb->s_fs_info;
224 struct fscrypt_name nm;
226 dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
228 err = fscrypt_prepare_lookup(dir, dentry, &nm);
230 return d_splice_alias(NULL, dentry);
234 if (fname_len(&nm) > UBIFS_MAX_NLEN) {
235 inode = ERR_PTR(-ENAMETOOLONG);
239 dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
241 inode = ERR_PTR(-ENOMEM);
245 if (fname_name(&nm) == NULL) {
246 if (nm.hash & ~UBIFS_S_KEY_HASH_MASK)
247 goto done; /* ENOENT */
248 dent_key_init_hash(c, &key, dir->i_ino, nm.hash);
249 err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash);
251 dent_key_init(c, &key, dir->i_ino, &nm);
252 err = ubifs_tnc_lookup_nm(c, &key, dent, &nm);
257 dbg_gen("not found");
259 inode = ERR_PTR(err);
263 if (dbg_check_name(c, dent, &nm)) {
264 inode = ERR_PTR(-EINVAL);
268 inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
271 * This should not happen. Probably the file-system needs
274 err = PTR_ERR(inode);
275 ubifs_err(c, "dead directory entry '%pd', error %d",
277 ubifs_ro_mode(c, err);
281 if (IS_ENCRYPTED(dir) &&
282 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
283 !fscrypt_has_permitted_context(dir, inode)) {
284 ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu",
285 dir->i_ino, inode->i_ino);
287 inode = ERR_PTR(-EPERM);
292 fscrypt_free_filename(&nm);
293 return d_splice_alias(inode, dentry);
296 static int ubifs_prepare_create(struct inode *dir, struct dentry *dentry,
297 struct fscrypt_name *nm)
299 if (fscrypt_is_nokey_name(dentry))
302 return fscrypt_setup_filename(dir, &dentry->d_name, 0, nm);
305 static int ubifs_create(struct mnt_idmap *idmap, struct inode *dir,
306 struct dentry *dentry, umode_t mode, bool excl)
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 = ubifs_prepare_create(dir, dentry, &nm);
332 sz_change = CALC_DENT_SIZE(fname_len(&nm));
334 inode = ubifs_new_inode(c, dir, mode, false);
336 err = PTR_ERR(inode);
340 err = ubifs_init_security(dir, inode, &dentry->d_name);
345 mutex_lock(&dir_ui->ui_mutex);
346 dir->i_size += sz_change;
347 dir_ui->ui_size = dir->i_size;
348 inode_set_mtime_to_ts(dir,
349 inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
350 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0, 1);
353 mutex_unlock(&dir_ui->ui_mutex);
355 ubifs_release_budget(c, &req);
356 fscrypt_free_filename(&nm);
357 insert_inode_hash(inode);
358 d_instantiate(dentry, inode);
362 dir->i_size -= sz_change;
363 dir_ui->ui_size = dir->i_size;
364 mutex_unlock(&dir_ui->ui_mutex);
369 fscrypt_free_filename(&nm);
371 ubifs_release_budget(c, &req);
372 ubifs_err(c, "cannot create regular file, error %d", err);
376 static struct inode *create_whiteout(struct inode *dir, struct dentry *dentry)
379 umode_t mode = S_IFCHR | WHITEOUT_MODE;
381 struct ubifs_info *c = dir->i_sb->s_fs_info;
384 * Create an inode('nlink = 1') for whiteout without updating journal,
385 * let ubifs_jnl_rename() store it on flash to complete rename whiteout
389 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
390 dentry, mode, dir->i_ino);
392 inode = ubifs_new_inode(c, dir, mode, false);
394 err = PTR_ERR(inode);
398 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
399 ubifs_assert(c, inode->i_op == &ubifs_file_inode_operations);
401 err = ubifs_init_security(dir, inode, &dentry->d_name);
405 /* The dir size is updated by do_rename. */
406 insert_inode_hash(inode);
413 ubifs_err(c, "cannot create whiteout file, error %d", err);
418 * lock_2_inodes - a wrapper for locking two UBIFS inodes.
419 * @inode1: first inode
420 * @inode2: second inode
422 * We do not implement any tricks to guarantee strict lock ordering, because
423 * VFS has already done it for us on the @i_mutex. So this is just a simple
426 static void lock_2_inodes(struct inode *inode1, struct inode *inode2)
428 mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
429 mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
433 * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes.
434 * @inode1: first inode
435 * @inode2: second inode
437 static void unlock_2_inodes(struct inode *inode1, struct inode *inode2)
439 mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
440 mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
443 static int ubifs_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
444 struct file *file, umode_t mode)
446 struct dentry *dentry = file->f_path.dentry;
448 struct ubifs_info *c = dir->i_sb->s_fs_info;
449 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
451 struct ubifs_budget_req ino_req = { .dirtied_ino = 1 };
452 struct ubifs_inode *ui;
453 int err, instantiated = 0;
454 struct fscrypt_name nm;
457 * Budget request settings: new inode, new direntry, changing the
458 * parent directory inode.
459 * Allocate budget separately for new dirtied inode, the budget will
460 * be released via writeback.
463 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
464 dentry, mode, dir->i_ino);
466 err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
470 err = ubifs_budget_space(c, &req);
472 fscrypt_free_filename(&nm);
476 err = ubifs_budget_space(c, &ino_req);
478 ubifs_release_budget(c, &req);
479 fscrypt_free_filename(&nm);
483 inode = ubifs_new_inode(c, dir, mode, false);
485 err = PTR_ERR(inode);
488 ui = ubifs_inode(inode);
490 err = ubifs_init_security(dir, inode, &dentry->d_name);
495 mutex_lock(&ui->ui_mutex);
496 insert_inode_hash(inode);
497 d_tmpfile(file, inode);
498 ubifs_assert(c, ui->dirty);
501 mutex_unlock(&ui->ui_mutex);
503 lock_2_inodes(dir, inode);
504 err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0, 1);
507 unlock_2_inodes(dir, inode);
509 ubifs_release_budget(c, &req);
510 fscrypt_free_filename(&nm);
512 return finish_open_simple(file, 0);
515 unlock_2_inodes(dir, inode);
520 ubifs_release_budget(c, &req);
522 ubifs_release_budget(c, &ino_req);
523 fscrypt_free_filename(&nm);
524 ubifs_err(c, "cannot create temporary file, error %d", err);
529 * vfs_dent_type - get VFS directory entry type.
530 * @type: UBIFS directory entry type
532 * This function converts UBIFS directory entry type into VFS directory entry
535 static unsigned int vfs_dent_type(uint8_t type)
538 case UBIFS_ITYPE_REG:
540 case UBIFS_ITYPE_DIR:
542 case UBIFS_ITYPE_LNK:
544 case UBIFS_ITYPE_BLK:
546 case UBIFS_ITYPE_CHR:
548 case UBIFS_ITYPE_FIFO:
550 case UBIFS_ITYPE_SOCK:
558 struct ubifs_dir_data {
559 struct ubifs_dent_node *dent;
564 * The classical Unix view for directory is that it is a linear array of
565 * (name, inode number) entries. Linux/VFS assumes this model as well.
566 * Particularly, 'readdir()' call wants us to return a directory entry offset
567 * which later may be used to continue 'readdir()'ing the directory or to
568 * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this
569 * model because directory entries are identified by keys, which may collide.
571 * UBIFS uses directory entry hash value for directory offsets, so
572 * 'seekdir()'/'telldir()' may not always work because of possible key
573 * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work
574 * properly by means of saving full directory entry name in the private field
575 * of the file description object.
577 * This means that UBIFS cannot support NFS which requires full
578 * 'seekdir()'/'telldir()' support.
580 static int ubifs_readdir(struct file *file, struct dir_context *ctx)
582 int fstr_real_len = 0, err = 0;
583 struct fscrypt_name nm;
584 struct fscrypt_str fstr = {0};
586 struct ubifs_dent_node *dent;
587 struct inode *dir = file_inode(file);
588 struct ubifs_info *c = dir->i_sb->s_fs_info;
589 bool encrypted = IS_ENCRYPTED(dir);
590 struct ubifs_dir_data *data = file->private_data;
592 dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos);
594 if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2)
596 * The directory was seek'ed to a senseless position or there
597 * are no more entries.
602 err = fscrypt_prepare_readdir(dir);
606 err = fscrypt_fname_alloc_buffer(UBIFS_MAX_NLEN, &fstr);
610 fstr_real_len = fstr.len;
613 if (data->cookie == 0) {
615 * The file was seek'ed, which means that @data->dent
616 * is now invalid. This may also be just the first
617 * 'ubifs_readdir()' invocation, in which case
618 * @data->dent is NULL, and the below code is
626 * 'ubifs_dir_llseek()' sets @data->cookie to zero, and we use this
627 * for detecting whether the file was seek'ed.
631 /* File positions 0 and 1 correspond to "." and ".." */
633 ubifs_assert(c, !data->dent);
634 if (!dir_emit_dots(file, ctx)) {
636 fscrypt_fname_free_buffer(&fstr);
640 /* Find the first entry in TNC and save it */
641 lowest_dent_key(c, &key, dir->i_ino);
643 dent = ubifs_tnc_next_ent(c, &key, &nm);
649 ctx->pos = key_hash_flash(c, &dent->key);
656 * The directory was seek'ed to and is now readdir'ed.
657 * Find the entry corresponding to @ctx->pos or the closest one.
659 dent_key_init_hash(c, &key, dir->i_ino, ctx->pos);
661 dent = ubifs_tnc_next_ent(c, &key, &nm);
666 ctx->pos = key_hash_flash(c, &dent->key);
671 dbg_gen("ino %llu, new f_pos %#x",
672 (unsigned long long)le64_to_cpu(dent->inum),
673 key_hash_flash(c, &dent->key));
674 ubifs_assert(c, le64_to_cpu(dent->ch.sqnum) >
675 ubifs_inode(dir)->creat_sqnum);
677 fname_len(&nm) = le16_to_cpu(dent->nlen);
678 fname_name(&nm) = dent->name;
681 fstr.len = fstr_real_len;
683 err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c,
685 le32_to_cpu(dent->cookie),
686 &nm.disk_name, &fstr);
690 fstr.len = fname_len(&nm);
691 fstr.name = fname_name(&nm);
694 if (!dir_emit(ctx, fstr.name, fstr.len,
695 le64_to_cpu(dent->inum),
696 vfs_dent_type(dent->type))) {
698 fscrypt_fname_free_buffer(&fstr);
702 /* Switch to the next entry */
703 key_read(c, &dent->key, &key);
704 dent = ubifs_tnc_next_ent(c, &key, &nm);
711 ctx->pos = key_hash_flash(c, &dent->key);
721 fscrypt_fname_free_buffer(&fstr);
724 ubifs_err(c, "cannot find next direntry, error %d", err);
727 * -ENOENT is a non-fatal error in this context, the TNC uses
728 * it to indicate that the cursor moved past the current directory
729 * and readdir() has to stop.
734 /* 2 is a special value indicating that there are no more direntries */
739 /* Free saved readdir() state when the directory is closed */
740 static int ubifs_dir_release(struct inode *dir, struct file *file)
742 struct ubifs_dir_data *data = file->private_data;
746 file->private_data = NULL;
750 static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
751 struct dentry *dentry)
753 struct ubifs_info *c = dir->i_sb->s_fs_info;
754 struct inode *inode = d_inode(old_dentry);
755 struct ubifs_inode *ui = ubifs_inode(inode);
756 struct ubifs_inode *dir_ui = ubifs_inode(dir);
758 struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2,
759 .dirtied_ino_d = ALIGN(ui->data_len, 8) };
760 struct fscrypt_name nm;
763 * Budget request settings: new direntry, changing the target inode,
764 * changing the parent inode.
767 dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu",
768 dentry, inode->i_ino,
769 inode->i_nlink, dir->i_ino);
770 ubifs_assert(c, inode_is_locked(dir));
771 ubifs_assert(c, inode_is_locked(inode));
773 err = fscrypt_prepare_link(old_dentry, dir, dentry);
777 err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
781 sz_change = CALC_DENT_SIZE(fname_len(&nm));
783 err = dbg_check_synced_i_size(c, inode);
787 err = ubifs_budget_space(c, &req);
791 lock_2_inodes(dir, inode);
795 inode_set_ctime_current(inode);
796 dir->i_size += sz_change;
797 dir_ui->ui_size = dir->i_size;
798 inode_set_mtime_to_ts(dir,
799 inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
800 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0, inode->i_nlink == 1);
803 unlock_2_inodes(dir, inode);
805 ubifs_release_budget(c, &req);
806 d_instantiate(dentry, inode);
807 fscrypt_free_filename(&nm);
811 dir->i_size -= sz_change;
812 dir_ui->ui_size = dir->i_size;
814 unlock_2_inodes(dir, inode);
815 ubifs_release_budget(c, &req);
818 fscrypt_free_filename(&nm);
822 static int ubifs_unlink(struct inode *dir, struct dentry *dentry)
824 struct ubifs_info *c = dir->i_sb->s_fs_info;
825 struct inode *inode = d_inode(dentry);
826 struct ubifs_inode *dir_ui = ubifs_inode(dir);
827 int err, sz_change, budgeted = 1;
828 struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
829 unsigned int saved_nlink = inode->i_nlink;
830 struct fscrypt_name nm;
833 * Budget request settings: deletion direntry, deletion inode (+1 for
834 * @dirtied_ino), changing the parent directory inode. If budgeting
835 * fails, go ahead anyway because we have extra space reserved for
839 dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu",
840 dentry, inode->i_ino,
841 inode->i_nlink, dir->i_ino);
843 err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
847 err = ubifs_purge_xattrs(inode);
851 sz_change = CALC_DENT_SIZE(fname_len(&nm));
853 ubifs_assert(c, inode_is_locked(dir));
854 ubifs_assert(c, inode_is_locked(inode));
855 err = dbg_check_synced_i_size(c, inode);
859 err = ubifs_budget_space(c, &req);
866 lock_2_inodes(dir, inode);
867 inode_set_ctime_current(inode);
869 dir->i_size -= sz_change;
870 dir_ui->ui_size = dir->i_size;
871 inode_set_mtime_to_ts(dir,
872 inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
873 err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0, 0);
876 unlock_2_inodes(dir, inode);
879 ubifs_release_budget(c, &req);
881 /* We've deleted something - clean the "no space" flags */
882 c->bi.nospace = c->bi.nospace_rp = 0;
885 fscrypt_free_filename(&nm);
889 dir->i_size += sz_change;
890 dir_ui->ui_size = dir->i_size;
891 set_nlink(inode, saved_nlink);
892 unlock_2_inodes(dir, inode);
894 ubifs_release_budget(c, &req);
896 fscrypt_free_filename(&nm);
901 * ubifs_check_dir_empty - check if a directory is empty or not.
902 * @dir: VFS inode object of the directory to check
904 * This function checks if directory @dir is empty. Returns zero if the
905 * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes
908 int ubifs_check_dir_empty(struct inode *dir)
910 struct ubifs_info *c = dir->i_sb->s_fs_info;
911 struct fscrypt_name nm = { 0 };
912 struct ubifs_dent_node *dent;
916 lowest_dent_key(c, &key, dir->i_ino);
917 dent = ubifs_tnc_next_ent(c, &key, &nm);
929 static int ubifs_rmdir(struct inode *dir, struct dentry *dentry)
931 struct ubifs_info *c = dir->i_sb->s_fs_info;
932 struct inode *inode = d_inode(dentry);
933 int err, sz_change, budgeted = 1;
934 struct ubifs_inode *dir_ui = ubifs_inode(dir);
935 struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
936 struct fscrypt_name nm;
939 * Budget request settings: deletion direntry, deletion inode and
940 * changing the parent inode. If budgeting fails, go ahead anyway
941 * because we have extra space reserved for deletions.
944 dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry,
945 inode->i_ino, dir->i_ino);
946 ubifs_assert(c, inode_is_locked(dir));
947 ubifs_assert(c, inode_is_locked(inode));
948 err = ubifs_check_dir_empty(d_inode(dentry));
952 err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
956 err = ubifs_purge_xattrs(inode);
960 sz_change = CALC_DENT_SIZE(fname_len(&nm));
962 err = ubifs_budget_space(c, &req);
969 lock_2_inodes(dir, inode);
970 inode_set_ctime_current(inode);
973 dir->i_size -= sz_change;
974 dir_ui->ui_size = dir->i_size;
975 inode_set_mtime_to_ts(dir,
976 inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
977 err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0, 0);
980 unlock_2_inodes(dir, inode);
983 ubifs_release_budget(c, &req);
985 /* We've deleted something - clean the "no space" flags */
986 c->bi.nospace = c->bi.nospace_rp = 0;
989 fscrypt_free_filename(&nm);
993 dir->i_size += sz_change;
994 dir_ui->ui_size = dir->i_size;
997 unlock_2_inodes(dir, inode);
999 ubifs_release_budget(c, &req);
1001 fscrypt_free_filename(&nm);
1005 static int ubifs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
1006 struct dentry *dentry, umode_t mode)
1008 struct inode *inode;
1009 struct ubifs_inode *dir_ui = ubifs_inode(dir);
1010 struct ubifs_info *c = dir->i_sb->s_fs_info;
1012 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
1014 struct fscrypt_name nm;
1017 * Budget request settings: new inode, new direntry and changing parent
1021 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
1022 dentry, mode, dir->i_ino);
1024 err = ubifs_budget_space(c, &req);
1028 err = ubifs_prepare_create(dir, dentry, &nm);
1032 sz_change = CALC_DENT_SIZE(fname_len(&nm));
1034 inode = ubifs_new_inode(c, dir, S_IFDIR | mode, false);
1035 if (IS_ERR(inode)) {
1036 err = PTR_ERR(inode);
1040 err = ubifs_init_security(dir, inode, &dentry->d_name);
1044 set_nlink(inode, 1);
1045 mutex_lock(&dir_ui->ui_mutex);
1046 insert_inode_hash(inode);
1049 dir->i_size += sz_change;
1050 dir_ui->ui_size = dir->i_size;
1051 inode_set_mtime_to_ts(dir,
1052 inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
1053 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0, 1);
1055 ubifs_err(c, "cannot create directory, error %d", err);
1058 mutex_unlock(&dir_ui->ui_mutex);
1060 ubifs_release_budget(c, &req);
1061 d_instantiate(dentry, inode);
1062 fscrypt_free_filename(&nm);
1066 dir->i_size -= sz_change;
1067 dir_ui->ui_size = dir->i_size;
1069 mutex_unlock(&dir_ui->ui_mutex);
1070 set_nlink(inode, 0);
1074 fscrypt_free_filename(&nm);
1076 ubifs_release_budget(c, &req);
1080 static int ubifs_mknod(struct mnt_idmap *idmap, struct inode *dir,
1081 struct dentry *dentry, umode_t mode, dev_t rdev)
1083 struct inode *inode;
1084 struct ubifs_inode *ui;
1085 struct ubifs_inode *dir_ui = ubifs_inode(dir);
1086 struct ubifs_info *c = dir->i_sb->s_fs_info;
1087 union ubifs_dev_desc *dev = NULL;
1089 int err, devlen = 0;
1090 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
1092 struct fscrypt_name nm;
1095 * Budget request settings: new inode, new direntry and changing parent
1099 dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino);
1101 if (S_ISBLK(mode) || S_ISCHR(mode)) {
1102 dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
1105 devlen = ubifs_encode_dev(dev, rdev);
1108 req.new_ino_d = ALIGN(devlen, 8);
1109 err = ubifs_budget_space(c, &req);
1115 err = ubifs_prepare_create(dir, dentry, &nm);
1121 sz_change = CALC_DENT_SIZE(fname_len(&nm));
1123 inode = ubifs_new_inode(c, dir, mode, false);
1124 if (IS_ERR(inode)) {
1126 err = PTR_ERR(inode);
1130 err = ubifs_init_security(dir, inode, &dentry->d_name);
1136 init_special_inode(inode, inode->i_mode, rdev);
1137 inode->i_size = ubifs_inode(inode)->ui_size = devlen;
1138 ui = ubifs_inode(inode);
1140 ui->data_len = devlen;
1141 set_nlink(inode, 1);
1143 mutex_lock(&dir_ui->ui_mutex);
1144 dir->i_size += sz_change;
1145 dir_ui->ui_size = dir->i_size;
1146 inode_set_mtime_to_ts(dir,
1147 inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
1148 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0, 1);
1151 mutex_unlock(&dir_ui->ui_mutex);
1153 ubifs_release_budget(c, &req);
1154 insert_inode_hash(inode);
1155 d_instantiate(dentry, inode);
1156 fscrypt_free_filename(&nm);
1160 dir->i_size -= sz_change;
1161 dir_ui->ui_size = dir->i_size;
1162 mutex_unlock(&dir_ui->ui_mutex);
1163 set_nlink(inode, 0);
1167 fscrypt_free_filename(&nm);
1169 ubifs_release_budget(c, &req);
1173 static int ubifs_symlink(struct mnt_idmap *idmap, struct inode *dir,
1174 struct dentry *dentry, const char *symname)
1176 struct inode *inode;
1177 struct ubifs_inode *ui;
1178 struct ubifs_inode *dir_ui = ubifs_inode(dir);
1179 struct ubifs_info *c = dir->i_sb->s_fs_info;
1180 int err, sz_change, len = strlen(symname);
1181 struct fscrypt_str disk_link;
1182 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
1184 struct fscrypt_name nm;
1186 dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
1187 symname, dir->i_ino);
1189 err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA,
1195 * Budget request settings: new inode, new direntry and changing parent
1198 req.new_ino_d = ALIGN(disk_link.len - 1, 8);
1199 err = ubifs_budget_space(c, &req);
1203 err = ubifs_prepare_create(dir, dentry, &nm);
1207 sz_change = CALC_DENT_SIZE(fname_len(&nm));
1209 inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO, false);
1210 if (IS_ERR(inode)) {
1211 err = PTR_ERR(inode);
1215 err = ubifs_init_security(dir, inode, &dentry->d_name);
1219 ui = ubifs_inode(inode);
1220 ui->data = kmalloc(disk_link.len, GFP_NOFS);
1226 if (IS_ENCRYPTED(inode)) {
1227 disk_link.name = ui->data; /* encrypt directly into ui->data */
1228 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
1232 memcpy(ui->data, disk_link.name, disk_link.len);
1233 inode->i_link = ui->data;
1237 * The terminating zero byte is not written to the flash media and it
1238 * is put just to make later in-memory string processing simpler. Thus,
1239 * data length is @disk_link.len - 1, not @disk_link.len.
1241 ui->data_len = disk_link.len - 1;
1242 inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1;
1243 set_nlink(inode, 1);
1245 mutex_lock(&dir_ui->ui_mutex);
1246 dir->i_size += sz_change;
1247 dir_ui->ui_size = dir->i_size;
1248 inode_set_mtime_to_ts(dir,
1249 inode_set_ctime_to_ts(dir, inode_get_ctime(inode)));
1250 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0, 1);
1253 mutex_unlock(&dir_ui->ui_mutex);
1255 insert_inode_hash(inode);
1256 d_instantiate(dentry, inode);
1261 dir->i_size -= sz_change;
1262 dir_ui->ui_size = dir->i_size;
1263 mutex_unlock(&dir_ui->ui_mutex);
1264 set_nlink(inode, 0);
1266 /* Free inode->i_link before inode is marked as bad. */
1267 fscrypt_free_inode(inode);
1270 fscrypt_free_filename(&nm);
1272 ubifs_release_budget(c, &req);
1277 * lock_4_inodes - a wrapper for locking three UBIFS inodes.
1278 * @inode1: first inode
1279 * @inode2: second inode
1280 * @inode3: third inode
1281 * @inode4: fourth inode
1283 * This function is used for 'ubifs_rename()' and @inode1 may be the same as
1284 * @inode2 whereas @inode3 and @inode4 may be %NULL.
1286 * We do not implement any tricks to guarantee strict lock ordering, because
1287 * VFS has already done it for us on the @i_mutex. So this is just a simple
1290 static void lock_4_inodes(struct inode *inode1, struct inode *inode2,
1291 struct inode *inode3, struct inode *inode4)
1293 mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
1294 if (inode2 != inode1)
1295 mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
1297 mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
1299 mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4);
1303 * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename.
1304 * @inode1: first inode
1305 * @inode2: second inode
1306 * @inode3: third inode
1307 * @inode4: fourth inode
1309 static void unlock_4_inodes(struct inode *inode1, struct inode *inode2,
1310 struct inode *inode3, struct inode *inode4)
1313 mutex_unlock(&ubifs_inode(inode4)->ui_mutex);
1315 mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
1316 if (inode1 != inode2)
1317 mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
1318 mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
1321 static int do_rename(struct inode *old_dir, struct dentry *old_dentry,
1322 struct inode *new_dir, struct dentry *new_dentry,
1325 struct ubifs_info *c = old_dir->i_sb->s_fs_info;
1326 struct inode *old_inode = d_inode(old_dentry);
1327 struct inode *new_inode = d_inode(new_dentry);
1328 struct inode *whiteout = NULL;
1329 struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
1330 struct ubifs_inode *whiteout_ui = NULL;
1331 int err, release, sync = 0, move = (new_dir != old_dir);
1332 int is_dir = S_ISDIR(old_inode->i_mode);
1333 int unlink = !!new_inode, new_sz, old_sz;
1334 struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
1336 struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
1337 .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
1338 struct ubifs_budget_req wht_req;
1339 unsigned int saved_nlink;
1340 struct fscrypt_name old_nm, new_nm;
1343 * Budget request settings:
1344 * req: deletion direntry, new direntry, removing the old inode,
1345 * and changing old and new parent directory inodes.
1347 * wht_req: new whiteout inode for RENAME_WHITEOUT.
1349 * ino_req: marks the target inode as dirty and does not write it.
1352 dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x",
1353 old_dentry, old_inode->i_ino, old_dir->i_ino,
1354 new_dentry, new_dir->i_ino, flags);
1357 ubifs_assert(c, inode_is_locked(new_inode));
1359 /* Budget for old inode's data when its nlink > 1. */
1360 req.dirtied_ino_d = ALIGN(ubifs_inode(new_inode)->data_len, 8);
1361 err = ubifs_purge_xattrs(new_inode);
1366 if (unlink && is_dir) {
1367 err = ubifs_check_dir_empty(new_inode);
1372 err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm);
1376 err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm);
1378 fscrypt_free_filename(&old_nm);
1382 new_sz = CALC_DENT_SIZE(fname_len(&new_nm));
1383 old_sz = CALC_DENT_SIZE(fname_len(&old_nm));
1385 err = ubifs_budget_space(c, &req);
1387 fscrypt_free_filename(&old_nm);
1388 fscrypt_free_filename(&new_nm);
1391 err = ubifs_budget_space(c, &ino_req);
1393 fscrypt_free_filename(&old_nm);
1394 fscrypt_free_filename(&new_nm);
1395 ubifs_release_budget(c, &req);
1399 if (flags & RENAME_WHITEOUT) {
1400 union ubifs_dev_desc *dev = NULL;
1402 dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
1409 * The whiteout inode without dentry is pinned in memory,
1410 * umount won't happen during rename process because we
1411 * got parent dentry.
1413 whiteout = create_whiteout(old_dir, old_dentry);
1414 if (IS_ERR(whiteout)) {
1415 err = PTR_ERR(whiteout);
1420 whiteout_ui = ubifs_inode(whiteout);
1421 whiteout_ui->data = dev;
1422 whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0));
1423 ubifs_assert(c, !whiteout_ui->dirty);
1425 memset(&wht_req, 0, sizeof(struct ubifs_budget_req));
1426 wht_req.new_ino = 1;
1427 wht_req.new_ino_d = ALIGN(whiteout_ui->data_len, 8);
1429 * To avoid deadlock between space budget (holds ui_mutex and
1430 * waits wb work) and writeback work(waits ui_mutex), do space
1431 * budget before ubifs inodes locked.
1433 err = ubifs_budget_space(c, &wht_req);
1438 set_nlink(whiteout, 1);
1440 /* Add the old_dentry size to the old_dir size. */
1441 old_sz -= CALC_DENT_SIZE(fname_len(&old_nm));
1444 lock_4_inodes(old_dir, new_dir, new_inode, whiteout);
1447 * Like most other Unix systems, set the @i_ctime for inodes on a
1450 simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
1452 /* We must adjust parent link count when renaming directories */
1456 * @old_dir loses a link because we are moving
1457 * @old_inode to a different directory.
1459 drop_nlink(old_dir);
1461 * @new_dir only gains a link if we are not also
1462 * overwriting an existing directory.
1468 * @old_inode is not moving to a different directory,
1469 * but @old_dir still loses a link if we are
1470 * overwriting an existing directory.
1473 drop_nlink(old_dir);
1477 old_dir->i_size -= old_sz;
1478 ubifs_inode(old_dir)->ui_size = old_dir->i_size;
1481 * And finally, if we unlinked a direntry which happened to have the
1482 * same name as the moved direntry, we have to decrement @i_nlink of
1483 * the unlinked inode.
1487 * Directories cannot have hard-links, so if this is a
1488 * directory, just clear @i_nlink.
1490 saved_nlink = new_inode->i_nlink;
1492 clear_nlink(new_inode);
1494 drop_nlink(new_inode);
1496 new_dir->i_size += new_sz;
1497 ubifs_inode(new_dir)->ui_size = new_dir->i_size;
1501 * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode
1502 * is dirty, because this will be done later on at the end of
1505 if (IS_SYNC(old_inode)) {
1506 sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
1507 if (unlink && IS_SYNC(new_inode))
1510 * S_SYNC flag of whiteout inherits from the old_dir, and we
1511 * have already checked the old dir inode. So there is no need
1512 * to check whiteout.
1516 err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir,
1517 new_inode, &new_nm, whiteout, sync, !!whiteout);
1521 unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
1522 ubifs_release_budget(c, &req);
1525 ubifs_release_budget(c, &wht_req);
1529 mutex_lock(&old_inode_ui->ui_mutex);
1530 release = old_inode_ui->dirty;
1531 mark_inode_dirty_sync(old_inode);
1532 mutex_unlock(&old_inode_ui->ui_mutex);
1535 ubifs_release_budget(c, &ino_req);
1536 if (IS_SYNC(old_inode))
1538 * Rename finished here. Although old inode cannot be updated
1539 * on flash, old ctime is not a big problem, don't return err
1540 * code to userspace.
1542 old_inode->i_sb->s_op->write_inode(old_inode, NULL);
1544 fscrypt_free_filename(&old_nm);
1545 fscrypt_free_filename(&new_nm);
1550 set_nlink(new_inode, saved_nlink);
1552 new_dir->i_size -= new_sz;
1553 ubifs_inode(new_dir)->ui_size = new_dir->i_size;
1555 old_dir->i_size += old_sz;
1556 ubifs_inode(old_dir)->ui_size = old_dir->i_size;
1561 drop_nlink(new_dir);
1567 unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
1569 ubifs_release_budget(c, &wht_req);
1570 set_nlink(whiteout, 0);
1574 ubifs_release_budget(c, &ino_req);
1575 ubifs_release_budget(c, &req);
1576 fscrypt_free_filename(&old_nm);
1577 fscrypt_free_filename(&new_nm);
1581 static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
1582 struct inode *new_dir, struct dentry *new_dentry)
1584 struct ubifs_info *c = old_dir->i_sb->s_fs_info;
1585 struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
1587 int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
1588 struct inode *fst_inode = d_inode(old_dentry);
1589 struct inode *snd_inode = d_inode(new_dentry);
1591 struct fscrypt_name fst_nm, snd_nm;
1593 ubifs_assert(c, fst_inode && snd_inode);
1596 * Budget request settings: changing two direntries, changing the two
1597 * parent directory inodes.
1600 dbg_gen("dent '%pd' ino %lu in dir ino %lu exchange dent '%pd' ino %lu in dir ino %lu",
1601 old_dentry, fst_inode->i_ino, old_dir->i_ino,
1602 new_dentry, snd_inode->i_ino, new_dir->i_ino);
1604 err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm);
1608 err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm);
1610 fscrypt_free_filename(&fst_nm);
1614 err = ubifs_budget_space(c, &req);
1618 lock_4_inodes(old_dir, new_dir, NULL, NULL);
1620 simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
1622 if (old_dir != new_dir) {
1623 if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) {
1625 drop_nlink(old_dir);
1627 else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) {
1628 drop_nlink(new_dir);
1633 err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir,
1634 snd_inode, &snd_nm, sync);
1636 unlock_4_inodes(old_dir, new_dir, NULL, NULL);
1637 ubifs_release_budget(c, &req);
1640 fscrypt_free_filename(&fst_nm);
1641 fscrypt_free_filename(&snd_nm);
1645 static int ubifs_rename(struct mnt_idmap *idmap,
1646 struct inode *old_dir, struct dentry *old_dentry,
1647 struct inode *new_dir, struct dentry *new_dentry,
1651 struct ubifs_info *c = old_dir->i_sb->s_fs_info;
1653 if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE))
1656 ubifs_assert(c, inode_is_locked(old_dir));
1657 ubifs_assert(c, inode_is_locked(new_dir));
1659 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1664 if (flags & RENAME_EXCHANGE)
1665 return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry);
1667 return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1670 int ubifs_getattr(struct mnt_idmap *idmap, const struct path *path,
1671 struct kstat *stat, u32 request_mask, unsigned int flags)
1674 struct inode *inode = d_inode(path->dentry);
1675 struct ubifs_inode *ui = ubifs_inode(inode);
1677 mutex_lock(&ui->ui_mutex);
1679 if (ui->flags & UBIFS_APPEND_FL)
1680 stat->attributes |= STATX_ATTR_APPEND;
1681 if (ui->flags & UBIFS_COMPR_FL)
1682 stat->attributes |= STATX_ATTR_COMPRESSED;
1683 if (ui->flags & UBIFS_CRYPT_FL)
1684 stat->attributes |= STATX_ATTR_ENCRYPTED;
1685 if (ui->flags & UBIFS_IMMUTABLE_FL)
1686 stat->attributes |= STATX_ATTR_IMMUTABLE;
1688 stat->attributes_mask |= (STATX_ATTR_APPEND |
1689 STATX_ATTR_COMPRESSED |
1690 STATX_ATTR_ENCRYPTED |
1691 STATX_ATTR_IMMUTABLE);
1693 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
1694 stat->blksize = UBIFS_BLOCK_SIZE;
1695 stat->size = ui->ui_size;
1698 * Unfortunately, the 'stat()' system call was designed for block
1699 * device based file systems, and it is not appropriate for UBIFS,
1700 * because UBIFS does not have notion of "block". For example, it is
1701 * difficult to tell how many block a directory takes - it actually
1702 * takes less than 300 bytes, but we have to round it to block size,
1703 * which introduces large mistake. This makes utilities like 'du' to
1704 * report completely senseless numbers. This is the reason why UBIFS
1705 * goes the same way as JFFS2 - it reports zero blocks for everything
1706 * but regular files, which makes more sense than reporting completely
1709 if (S_ISREG(inode->i_mode)) {
1710 size = ui->xattr_size;
1712 size = ALIGN(size, UBIFS_BLOCK_SIZE);
1714 * Note, user-space expects 512-byte blocks count irrespectively
1715 * of what was reported in @stat->size.
1717 stat->blocks = size >> 9;
1720 mutex_unlock(&ui->ui_mutex);
1724 static int ubifs_dir_open(struct inode *inode, struct file *file)
1726 struct ubifs_dir_data *data;
1728 data = kzalloc(sizeof(struct ubifs_dir_data), GFP_KERNEL);
1731 file->private_data = data;
1735 static loff_t ubifs_dir_llseek(struct file *file, loff_t offset, int whence)
1737 struct ubifs_dir_data *data = file->private_data;
1739 return generic_llseek_cookie(file, offset, whence, &data->cookie);
1742 const struct inode_operations ubifs_dir_inode_operations = {
1743 .lookup = ubifs_lookup,
1744 .create = ubifs_create,
1746 .symlink = ubifs_symlink,
1747 .unlink = ubifs_unlink,
1748 .mkdir = ubifs_mkdir,
1749 .rmdir = ubifs_rmdir,
1750 .mknod = ubifs_mknod,
1751 .rename = ubifs_rename,
1752 .setattr = ubifs_setattr,
1753 .getattr = ubifs_getattr,
1754 .listxattr = ubifs_listxattr,
1755 .update_time = ubifs_update_time,
1756 .tmpfile = ubifs_tmpfile,
1757 .fileattr_get = ubifs_fileattr_get,
1758 .fileattr_set = ubifs_fileattr_set,
1761 const struct file_operations ubifs_dir_operations = {
1762 .open = ubifs_dir_open,
1763 .llseek = ubifs_dir_llseek,
1764 .release = ubifs_dir_release,
1765 .read = generic_read_dir,
1766 .iterate_shared = ubifs_readdir,
1767 .fsync = ubifs_fsync,
1768 .unlocked_ioctl = ubifs_ioctl,
1769 #ifdef CONFIG_COMPAT
1770 .compat_ioctl = ubifs_compat_ioctl,