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
72 * This function finds an unused inode number, allocates new inode and
73 * initializes it. Returns new inode in case of success and an error code in
76 struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir,
81 struct ubifs_inode *ui;
82 bool encrypted = false;
84 inode = new_inode(c->vfs_sb);
85 ui = ubifs_inode(inode);
87 return ERR_PTR(-ENOMEM);
90 * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and
91 * marking them dirty in file write path (see 'file_update_time()').
92 * UBIFS has to fully control "clean <-> dirty" transitions of inodes
93 * to make budgeting work.
95 inode->i_flags |= S_NOCMTIME;
97 inode_init_owner(&init_user_ns, inode, dir, mode);
98 inode->i_mtime = inode->i_atime = inode->i_ctime =
100 inode->i_mapping->nrpages = 0;
102 err = fscrypt_prepare_new_inode(dir, inode, &encrypted);
104 ubifs_err(c, "fscrypt_prepare_new_inode failed: %i", err);
108 switch (mode & S_IFMT) {
110 inode->i_mapping->a_ops = &ubifs_file_address_operations;
111 inode->i_op = &ubifs_file_inode_operations;
112 inode->i_fop = &ubifs_file_operations;
115 inode->i_op = &ubifs_dir_inode_operations;
116 inode->i_fop = &ubifs_dir_operations;
117 inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ;
120 inode->i_op = &ubifs_symlink_inode_operations;
126 inode->i_op = &ubifs_file_inode_operations;
132 ui->flags = inherit_flags(dir, mode);
133 ubifs_set_inode_flags(inode);
135 ui->compr_type = c->default_compr;
137 ui->compr_type = UBIFS_COMPR_NONE;
138 ui->synced_i_size = 0;
140 spin_lock(&c->cnt_lock);
141 /* Inode number overflow is currently not supported */
142 if (c->highest_inum >= INUM_WARN_WATERMARK) {
143 if (c->highest_inum >= INUM_WATERMARK) {
144 spin_unlock(&c->cnt_lock);
145 ubifs_err(c, "out of inode numbers");
149 ubifs_warn(c, "running out of inode numbers (current %lu, max %u)",
150 (unsigned long)c->highest_inum, INUM_WATERMARK);
153 inode->i_ino = ++c->highest_inum;
155 * The creation sequence number remains with this inode for its
156 * lifetime. All nodes for this inode have a greater sequence number,
157 * and so it is possible to distinguish obsolete nodes belonging to a
158 * previous incarnation of the same inode number - for example, for the
159 * purpose of rebuilding the index.
161 ui->creat_sqnum = ++c->max_sqnum;
162 spin_unlock(&c->cnt_lock);
165 err = fscrypt_set_context(inode, NULL);
167 ubifs_err(c, "fscrypt_set_context failed: %i", err);
175 make_bad_inode(inode);
180 static int dbg_check_name(const struct ubifs_info *c,
181 const struct ubifs_dent_node *dent,
182 const struct fscrypt_name *nm)
184 if (!dbg_is_chk_gen(c))
186 if (le16_to_cpu(dent->nlen) != fname_len(nm))
188 if (memcmp(dent->name, fname_name(nm), fname_len(nm)))
193 static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
198 struct inode *inode = NULL;
199 struct ubifs_dent_node *dent = NULL;
200 struct ubifs_info *c = dir->i_sb->s_fs_info;
201 struct fscrypt_name nm;
203 dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
205 err = fscrypt_prepare_lookup(dir, dentry, &nm);
206 generic_set_encrypted_ci_d_ops(dentry);
208 return d_splice_alias(NULL, dentry);
212 if (fname_len(&nm) > UBIFS_MAX_NLEN) {
213 inode = ERR_PTR(-ENAMETOOLONG);
217 dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
219 inode = ERR_PTR(-ENOMEM);
223 if (fname_name(&nm) == NULL) {
224 if (nm.hash & ~UBIFS_S_KEY_HASH_MASK)
225 goto done; /* ENOENT */
226 dent_key_init_hash(c, &key, dir->i_ino, nm.hash);
227 err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash);
229 dent_key_init(c, &key, dir->i_ino, &nm);
230 err = ubifs_tnc_lookup_nm(c, &key, dent, &nm);
235 dbg_gen("not found");
237 inode = ERR_PTR(err);
241 if (dbg_check_name(c, dent, &nm)) {
242 inode = ERR_PTR(-EINVAL);
246 inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
249 * This should not happen. Probably the file-system needs
252 err = PTR_ERR(inode);
253 ubifs_err(c, "dead directory entry '%pd', error %d",
255 ubifs_ro_mode(c, err);
259 if (IS_ENCRYPTED(dir) &&
260 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
261 !fscrypt_has_permitted_context(dir, inode)) {
262 ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu",
263 dir->i_ino, inode->i_ino);
265 inode = ERR_PTR(-EPERM);
270 fscrypt_free_filename(&nm);
271 return d_splice_alias(inode, dentry);
274 static int ubifs_prepare_create(struct inode *dir, struct dentry *dentry,
275 struct fscrypt_name *nm)
277 if (fscrypt_is_nokey_name(dentry))
280 return fscrypt_setup_filename(dir, &dentry->d_name, 0, nm);
283 static int ubifs_create(struct user_namespace *mnt_userns, struct inode *dir,
284 struct dentry *dentry, umode_t mode, bool excl)
287 struct ubifs_info *c = dir->i_sb->s_fs_info;
288 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
290 struct ubifs_inode *dir_ui = ubifs_inode(dir);
291 struct fscrypt_name nm;
295 * Budget request settings: new inode, new direntry, changing the
296 * parent directory inode.
299 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
300 dentry, mode, dir->i_ino);
302 err = ubifs_budget_space(c, &req);
306 err = ubifs_prepare_create(dir, dentry, &nm);
310 sz_change = CALC_DENT_SIZE(fname_len(&nm));
312 inode = ubifs_new_inode(c, dir, mode);
314 err = PTR_ERR(inode);
318 err = ubifs_init_security(dir, inode, &dentry->d_name);
322 mutex_lock(&dir_ui->ui_mutex);
323 dir->i_size += sz_change;
324 dir_ui->ui_size = dir->i_size;
325 dir->i_mtime = dir->i_ctime = inode->i_ctime;
326 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
329 mutex_unlock(&dir_ui->ui_mutex);
331 ubifs_release_budget(c, &req);
332 fscrypt_free_filename(&nm);
333 insert_inode_hash(inode);
334 d_instantiate(dentry, inode);
338 dir->i_size -= sz_change;
339 dir_ui->ui_size = dir->i_size;
340 mutex_unlock(&dir_ui->ui_mutex);
342 make_bad_inode(inode);
345 fscrypt_free_filename(&nm);
347 ubifs_release_budget(c, &req);
348 ubifs_err(c, "cannot create regular file, error %d", err);
352 static struct inode *create_whiteout(struct inode *dir, struct dentry *dentry)
355 umode_t mode = S_IFCHR | WHITEOUT_MODE;
357 struct ubifs_info *c = dir->i_sb->s_fs_info;
358 struct fscrypt_name nm;
361 * Create an inode('nlink = 1') for whiteout without updating journal,
362 * let ubifs_jnl_rename() store it on flash to complete rename whiteout
366 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
367 dentry, mode, dir->i_ino);
369 err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
373 inode = ubifs_new_inode(c, dir, mode);
375 err = PTR_ERR(inode);
379 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
380 ubifs_assert(c, inode->i_op == &ubifs_file_inode_operations);
382 err = ubifs_init_security(dir, inode, &dentry->d_name);
386 /* The dir size is updated by do_rename. */
387 insert_inode_hash(inode);
392 make_bad_inode(inode);
395 fscrypt_free_filename(&nm);
396 ubifs_err(c, "cannot create whiteout file, error %d", err);
401 * lock_2_inodes - a wrapper for locking two UBIFS inodes.
402 * @inode1: first inode
403 * @inode2: second inode
405 * We do not implement any tricks to guarantee strict lock ordering, because
406 * VFS has already done it for us on the @i_mutex. So this is just a simple
409 static void lock_2_inodes(struct inode *inode1, struct inode *inode2)
411 mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
412 mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
416 * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes.
417 * @inode1: first inode
418 * @inode2: second inode
420 static void unlock_2_inodes(struct inode *inode1, struct inode *inode2)
422 mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
423 mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
426 static int ubifs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
427 struct file *file, umode_t mode)
429 struct dentry *dentry = file->f_path.dentry;
431 struct ubifs_info *c = dir->i_sb->s_fs_info;
432 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
434 struct ubifs_budget_req ino_req = { .dirtied_ino = 1 };
435 struct ubifs_inode *ui;
436 int err, instantiated = 0;
437 struct fscrypt_name nm;
440 * Budget request settings: new inode, new direntry, changing the
441 * parent directory inode.
442 * Allocate budget separately for new dirtied inode, the budget will
443 * be released via writeback.
446 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
447 dentry, mode, dir->i_ino);
449 err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
453 err = ubifs_budget_space(c, &req);
455 fscrypt_free_filename(&nm);
459 err = ubifs_budget_space(c, &ino_req);
461 ubifs_release_budget(c, &req);
462 fscrypt_free_filename(&nm);
466 inode = ubifs_new_inode(c, dir, mode);
468 err = PTR_ERR(inode);
471 ui = ubifs_inode(inode);
473 err = ubifs_init_security(dir, inode, &dentry->d_name);
477 mutex_lock(&ui->ui_mutex);
478 insert_inode_hash(inode);
479 d_tmpfile(file, inode);
480 ubifs_assert(c, ui->dirty);
483 mutex_unlock(&ui->ui_mutex);
485 lock_2_inodes(dir, inode);
486 err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
489 unlock_2_inodes(dir, inode);
491 ubifs_release_budget(c, &req);
493 return finish_open_simple(file, 0);
496 unlock_2_inodes(dir, inode);
498 make_bad_inode(inode);
502 ubifs_release_budget(c, &req);
504 ubifs_release_budget(c, &ino_req);
505 fscrypt_free_filename(&nm);
506 ubifs_err(c, "cannot create temporary file, error %d", err);
511 * vfs_dent_type - get VFS directory entry type.
512 * @type: UBIFS directory entry type
514 * This function converts UBIFS directory entry type into VFS directory entry
517 static unsigned int vfs_dent_type(uint8_t type)
520 case UBIFS_ITYPE_REG:
522 case UBIFS_ITYPE_DIR:
524 case UBIFS_ITYPE_LNK:
526 case UBIFS_ITYPE_BLK:
528 case UBIFS_ITYPE_CHR:
530 case UBIFS_ITYPE_FIFO:
532 case UBIFS_ITYPE_SOCK:
541 * The classical Unix view for directory is that it is a linear array of
542 * (name, inode number) entries. Linux/VFS assumes this model as well.
543 * Particularly, 'readdir()' call wants us to return a directory entry offset
544 * which later may be used to continue 'readdir()'ing the directory or to
545 * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this
546 * model because directory entries are identified by keys, which may collide.
548 * UBIFS uses directory entry hash value for directory offsets, so
549 * 'seekdir()'/'telldir()' may not always work because of possible key
550 * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work
551 * properly by means of saving full directory entry name in the private field
552 * of the file description object.
554 * This means that UBIFS cannot support NFS which requires full
555 * 'seekdir()'/'telldir()' support.
557 static int ubifs_readdir(struct file *file, struct dir_context *ctx)
559 int fstr_real_len = 0, err = 0;
560 struct fscrypt_name nm;
561 struct fscrypt_str fstr = {0};
563 struct ubifs_dent_node *dent;
564 struct inode *dir = file_inode(file);
565 struct ubifs_info *c = dir->i_sb->s_fs_info;
566 bool encrypted = IS_ENCRYPTED(dir);
568 dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos);
570 if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2)
572 * The directory was seek'ed to a senseless position or there
573 * are no more entries.
578 err = fscrypt_prepare_readdir(dir);
582 err = fscrypt_fname_alloc_buffer(UBIFS_MAX_NLEN, &fstr);
586 fstr_real_len = fstr.len;
589 if (file->f_version == 0) {
591 * The file was seek'ed, which means that @file->private_data
592 * is now invalid. This may also be just the first
593 * 'ubifs_readdir()' invocation, in which case
594 * @file->private_data is NULL, and the below code is
597 kfree(file->private_data);
598 file->private_data = NULL;
602 * 'generic_file_llseek()' unconditionally sets @file->f_version to
603 * zero, and we use this for detecting whether the file was seek'ed.
607 /* File positions 0 and 1 correspond to "." and ".." */
609 ubifs_assert(c, !file->private_data);
610 if (!dir_emit_dots(file, ctx)) {
612 fscrypt_fname_free_buffer(&fstr);
616 /* Find the first entry in TNC and save it */
617 lowest_dent_key(c, &key, dir->i_ino);
619 dent = ubifs_tnc_next_ent(c, &key, &nm);
625 ctx->pos = key_hash_flash(c, &dent->key);
626 file->private_data = dent;
629 dent = file->private_data;
632 * The directory was seek'ed to and is now readdir'ed.
633 * Find the entry corresponding to @ctx->pos or the closest one.
635 dent_key_init_hash(c, &key, dir->i_ino, ctx->pos);
637 dent = ubifs_tnc_next_ent(c, &key, &nm);
642 ctx->pos = key_hash_flash(c, &dent->key);
643 file->private_data = dent;
647 dbg_gen("ino %llu, new f_pos %#x",
648 (unsigned long long)le64_to_cpu(dent->inum),
649 key_hash_flash(c, &dent->key));
650 ubifs_assert(c, le64_to_cpu(dent->ch.sqnum) >
651 ubifs_inode(dir)->creat_sqnum);
653 fname_len(&nm) = le16_to_cpu(dent->nlen);
654 fname_name(&nm) = dent->name;
657 fstr.len = fstr_real_len;
659 err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c,
661 le32_to_cpu(dent->cookie),
662 &nm.disk_name, &fstr);
666 fstr.len = fname_len(&nm);
667 fstr.name = fname_name(&nm);
670 if (!dir_emit(ctx, fstr.name, fstr.len,
671 le64_to_cpu(dent->inum),
672 vfs_dent_type(dent->type))) {
674 fscrypt_fname_free_buffer(&fstr);
678 /* Switch to the next entry */
679 key_read(c, &dent->key, &key);
680 dent = ubifs_tnc_next_ent(c, &key, &nm);
686 kfree(file->private_data);
687 ctx->pos = key_hash_flash(c, &dent->key);
688 file->private_data = dent;
693 kfree(file->private_data);
694 file->private_data = NULL;
697 fscrypt_fname_free_buffer(&fstr);
700 ubifs_err(c, "cannot find next direntry, error %d", err);
703 * -ENOENT is a non-fatal error in this context, the TNC uses
704 * it to indicate that the cursor moved past the current directory
705 * and readdir() has to stop.
710 /* 2 is a special value indicating that there are no more direntries */
715 /* Free saved readdir() state when the directory is closed */
716 static int ubifs_dir_release(struct inode *dir, struct file *file)
718 kfree(file->private_data);
719 file->private_data = NULL;
723 static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
724 struct dentry *dentry)
726 struct ubifs_info *c = dir->i_sb->s_fs_info;
727 struct inode *inode = d_inode(old_dentry);
728 struct ubifs_inode *ui = ubifs_inode(inode);
729 struct ubifs_inode *dir_ui = ubifs_inode(dir);
730 int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
731 struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2,
732 .dirtied_ino_d = ALIGN(ui->data_len, 8) };
733 struct fscrypt_name nm;
736 * Budget request settings: new direntry, changing the target inode,
737 * changing the parent inode.
740 dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu",
741 dentry, inode->i_ino,
742 inode->i_nlink, dir->i_ino);
743 ubifs_assert(c, inode_is_locked(dir));
744 ubifs_assert(c, inode_is_locked(inode));
746 err = fscrypt_prepare_link(old_dentry, dir, dentry);
750 err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
754 err = dbg_check_synced_i_size(c, inode);
758 err = ubifs_budget_space(c, &req);
762 lock_2_inodes(dir, inode);
764 /* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */
765 if (inode->i_nlink == 0)
766 ubifs_delete_orphan(c, inode->i_ino);
770 inode->i_ctime = current_time(inode);
771 dir->i_size += sz_change;
772 dir_ui->ui_size = dir->i_size;
773 dir->i_mtime = dir->i_ctime = inode->i_ctime;
774 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
777 unlock_2_inodes(dir, inode);
779 ubifs_release_budget(c, &req);
780 d_instantiate(dentry, inode);
781 fscrypt_free_filename(&nm);
785 dir->i_size -= sz_change;
786 dir_ui->ui_size = dir->i_size;
788 if (inode->i_nlink == 0)
789 ubifs_add_orphan(c, inode->i_ino);
790 unlock_2_inodes(dir, inode);
791 ubifs_release_budget(c, &req);
794 fscrypt_free_filename(&nm);
798 static int ubifs_unlink(struct inode *dir, struct dentry *dentry)
800 struct ubifs_info *c = dir->i_sb->s_fs_info;
801 struct inode *inode = d_inode(dentry);
802 struct ubifs_inode *dir_ui = ubifs_inode(dir);
803 int err, sz_change, budgeted = 1;
804 struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
805 unsigned int saved_nlink = inode->i_nlink;
806 struct fscrypt_name nm;
809 * Budget request settings: deletion direntry, deletion inode (+1 for
810 * @dirtied_ino), changing the parent directory inode. If budgeting
811 * fails, go ahead anyway because we have extra space reserved for
815 dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu",
816 dentry, inode->i_ino,
817 inode->i_nlink, dir->i_ino);
819 err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
823 err = ubifs_purge_xattrs(inode);
827 sz_change = CALC_DENT_SIZE(fname_len(&nm));
829 ubifs_assert(c, inode_is_locked(dir));
830 ubifs_assert(c, inode_is_locked(inode));
831 err = dbg_check_synced_i_size(c, inode);
835 err = ubifs_budget_space(c, &req);
842 lock_2_inodes(dir, inode);
843 inode->i_ctime = current_time(dir);
845 dir->i_size -= sz_change;
846 dir_ui->ui_size = dir->i_size;
847 dir->i_mtime = dir->i_ctime = inode->i_ctime;
848 err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
851 unlock_2_inodes(dir, inode);
854 ubifs_release_budget(c, &req);
856 /* We've deleted something - clean the "no space" flags */
857 c->bi.nospace = c->bi.nospace_rp = 0;
860 fscrypt_free_filename(&nm);
864 dir->i_size += sz_change;
865 dir_ui->ui_size = dir->i_size;
866 set_nlink(inode, saved_nlink);
867 unlock_2_inodes(dir, inode);
869 ubifs_release_budget(c, &req);
871 fscrypt_free_filename(&nm);
876 * check_dir_empty - check if a directory is empty or not.
877 * @dir: VFS inode object of the directory to check
879 * This function checks if directory @dir is empty. Returns zero if the
880 * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes
883 int ubifs_check_dir_empty(struct inode *dir)
885 struct ubifs_info *c = dir->i_sb->s_fs_info;
886 struct fscrypt_name nm = { 0 };
887 struct ubifs_dent_node *dent;
891 lowest_dent_key(c, &key, dir->i_ino);
892 dent = ubifs_tnc_next_ent(c, &key, &nm);
904 static int ubifs_rmdir(struct inode *dir, struct dentry *dentry)
906 struct ubifs_info *c = dir->i_sb->s_fs_info;
907 struct inode *inode = d_inode(dentry);
908 int err, sz_change, budgeted = 1;
909 struct ubifs_inode *dir_ui = ubifs_inode(dir);
910 struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
911 struct fscrypt_name nm;
914 * Budget request settings: deletion direntry, deletion inode and
915 * changing the parent inode. If budgeting fails, go ahead anyway
916 * because we have extra space reserved for deletions.
919 dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry,
920 inode->i_ino, dir->i_ino);
921 ubifs_assert(c, inode_is_locked(dir));
922 ubifs_assert(c, inode_is_locked(inode));
923 err = ubifs_check_dir_empty(d_inode(dentry));
927 err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
931 err = ubifs_purge_xattrs(inode);
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 = 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 user_namespace *mnt_userns, struct inode *dir,
980 struct dentry *dentry, umode_t mode)
983 struct ubifs_inode *dir_ui = ubifs_inode(dir);
984 struct ubifs_info *c = dir->i_sb->s_fs_info;
986 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
988 struct fscrypt_name nm;
991 * Budget request settings: new inode, new direntry and changing parent
995 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
996 dentry, mode, dir->i_ino);
998 err = ubifs_budget_space(c, &req);
1002 err = ubifs_prepare_create(dir, dentry, &nm);
1006 sz_change = CALC_DENT_SIZE(fname_len(&nm));
1008 inode = ubifs_new_inode(c, dir, S_IFDIR | mode);
1009 if (IS_ERR(inode)) {
1010 err = PTR_ERR(inode);
1014 err = ubifs_init_security(dir, inode, &dentry->d_name);
1018 mutex_lock(&dir_ui->ui_mutex);
1019 insert_inode_hash(inode);
1022 dir->i_size += sz_change;
1023 dir_ui->ui_size = dir->i_size;
1024 dir->i_mtime = dir->i_ctime = inode->i_ctime;
1025 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
1027 ubifs_err(c, "cannot create directory, error %d", err);
1030 mutex_unlock(&dir_ui->ui_mutex);
1032 ubifs_release_budget(c, &req);
1033 d_instantiate(dentry, inode);
1034 fscrypt_free_filename(&nm);
1038 dir->i_size -= sz_change;
1039 dir_ui->ui_size = dir->i_size;
1041 mutex_unlock(&dir_ui->ui_mutex);
1043 make_bad_inode(inode);
1046 fscrypt_free_filename(&nm);
1048 ubifs_release_budget(c, &req);
1052 static int ubifs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
1053 struct dentry *dentry, umode_t mode, dev_t rdev)
1055 struct inode *inode;
1056 struct ubifs_inode *ui;
1057 struct ubifs_inode *dir_ui = ubifs_inode(dir);
1058 struct ubifs_info *c = dir->i_sb->s_fs_info;
1059 union ubifs_dev_desc *dev = NULL;
1061 int err, devlen = 0;
1062 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
1064 struct fscrypt_name nm;
1067 * Budget request settings: new inode, new direntry and changing parent
1071 dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino);
1073 if (S_ISBLK(mode) || S_ISCHR(mode)) {
1074 dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
1077 devlen = ubifs_encode_dev(dev, rdev);
1080 req.new_ino_d = ALIGN(devlen, 8);
1081 err = ubifs_budget_space(c, &req);
1087 err = ubifs_prepare_create(dir, dentry, &nm);
1093 sz_change = CALC_DENT_SIZE(fname_len(&nm));
1095 inode = ubifs_new_inode(c, dir, mode);
1096 if (IS_ERR(inode)) {
1098 err = PTR_ERR(inode);
1102 init_special_inode(inode, inode->i_mode, rdev);
1103 inode->i_size = ubifs_inode(inode)->ui_size = devlen;
1104 ui = ubifs_inode(inode);
1106 ui->data_len = devlen;
1108 err = ubifs_init_security(dir, inode, &dentry->d_name);
1112 mutex_lock(&dir_ui->ui_mutex);
1113 dir->i_size += sz_change;
1114 dir_ui->ui_size = dir->i_size;
1115 dir->i_mtime = dir->i_ctime = inode->i_ctime;
1116 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
1119 mutex_unlock(&dir_ui->ui_mutex);
1121 ubifs_release_budget(c, &req);
1122 insert_inode_hash(inode);
1123 d_instantiate(dentry, inode);
1124 fscrypt_free_filename(&nm);
1128 dir->i_size -= sz_change;
1129 dir_ui->ui_size = dir->i_size;
1130 mutex_unlock(&dir_ui->ui_mutex);
1132 make_bad_inode(inode);
1135 fscrypt_free_filename(&nm);
1137 ubifs_release_budget(c, &req);
1141 static int ubifs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1142 struct dentry *dentry, const char *symname)
1144 struct inode *inode;
1145 struct ubifs_inode *ui;
1146 struct ubifs_inode *dir_ui = ubifs_inode(dir);
1147 struct ubifs_info *c = dir->i_sb->s_fs_info;
1148 int err, sz_change, len = strlen(symname);
1149 struct fscrypt_str disk_link;
1150 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
1151 .new_ino_d = ALIGN(len, 8),
1153 struct fscrypt_name nm;
1155 dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
1156 symname, dir->i_ino);
1158 err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA,
1164 * Budget request settings: new inode, new direntry and changing parent
1167 err = ubifs_budget_space(c, &req);
1171 err = ubifs_prepare_create(dir, dentry, &nm);
1175 sz_change = CALC_DENT_SIZE(fname_len(&nm));
1177 inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO);
1178 if (IS_ERR(inode)) {
1179 err = PTR_ERR(inode);
1183 ui = ubifs_inode(inode);
1184 ui->data = kmalloc(disk_link.len, GFP_NOFS);
1190 if (IS_ENCRYPTED(inode)) {
1191 disk_link.name = ui->data; /* encrypt directly into ui->data */
1192 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
1196 memcpy(ui->data, disk_link.name, disk_link.len);
1197 inode->i_link = ui->data;
1201 * The terminating zero byte is not written to the flash media and it
1202 * is put just to make later in-memory string processing simpler. Thus,
1203 * data length is @disk_link.len - 1, not @disk_link.len.
1205 ui->data_len = disk_link.len - 1;
1206 inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1;
1208 err = ubifs_init_security(dir, inode, &dentry->d_name);
1212 mutex_lock(&dir_ui->ui_mutex);
1213 dir->i_size += sz_change;
1214 dir_ui->ui_size = dir->i_size;
1215 dir->i_mtime = dir->i_ctime = inode->i_ctime;
1216 err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
1219 mutex_unlock(&dir_ui->ui_mutex);
1221 insert_inode_hash(inode);
1222 d_instantiate(dentry, inode);
1227 dir->i_size -= sz_change;
1228 dir_ui->ui_size = dir->i_size;
1229 mutex_unlock(&dir_ui->ui_mutex);
1231 make_bad_inode(inode);
1234 fscrypt_free_filename(&nm);
1236 ubifs_release_budget(c, &req);
1241 * lock_4_inodes - a wrapper for locking three UBIFS inodes.
1242 * @inode1: first inode
1243 * @inode2: second inode
1244 * @inode3: third inode
1245 * @inode4: fourth inode
1247 * This function is used for 'ubifs_rename()' and @inode1 may be the same as
1248 * @inode2 whereas @inode3 and @inode4 may be %NULL.
1250 * We do not implement any tricks to guarantee strict lock ordering, because
1251 * VFS has already done it for us on the @i_mutex. So this is just a simple
1254 static void lock_4_inodes(struct inode *inode1, struct inode *inode2,
1255 struct inode *inode3, struct inode *inode4)
1257 mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
1258 if (inode2 != inode1)
1259 mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
1261 mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
1263 mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4);
1267 * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename.
1268 * @inode1: first inode
1269 * @inode2: second inode
1270 * @inode3: third inode
1271 * @inode4: fourth inode
1273 static void unlock_4_inodes(struct inode *inode1, struct inode *inode2,
1274 struct inode *inode3, struct inode *inode4)
1277 mutex_unlock(&ubifs_inode(inode4)->ui_mutex);
1279 mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
1280 if (inode1 != inode2)
1281 mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
1282 mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
1285 static int do_rename(struct inode *old_dir, struct dentry *old_dentry,
1286 struct inode *new_dir, struct dentry *new_dentry,
1289 struct ubifs_info *c = old_dir->i_sb->s_fs_info;
1290 struct inode *old_inode = d_inode(old_dentry);
1291 struct inode *new_inode = d_inode(new_dentry);
1292 struct inode *whiteout = NULL;
1293 struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
1294 struct ubifs_inode *whiteout_ui = NULL;
1295 int err, release, sync = 0, move = (new_dir != old_dir);
1296 int is_dir = S_ISDIR(old_inode->i_mode);
1297 int unlink = !!new_inode, new_sz, old_sz;
1298 struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
1300 struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
1301 .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
1302 struct ubifs_budget_req wht_req;
1303 struct timespec64 time;
1304 unsigned int saved_nlink;
1305 struct fscrypt_name old_nm, new_nm;
1308 * Budget request settings:
1309 * req: deletion direntry, new direntry, removing the old inode,
1310 * and changing old and new parent directory inodes.
1312 * wht_req: new whiteout inode for RENAME_WHITEOUT.
1314 * ino_req: marks the target inode as dirty and does not write it.
1317 dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x",
1318 old_dentry, old_inode->i_ino, old_dir->i_ino,
1319 new_dentry, new_dir->i_ino, flags);
1322 ubifs_assert(c, inode_is_locked(new_inode));
1324 err = ubifs_purge_xattrs(new_inode);
1329 if (unlink && is_dir) {
1330 err = ubifs_check_dir_empty(new_inode);
1335 err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm);
1339 err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm);
1341 fscrypt_free_filename(&old_nm);
1345 new_sz = CALC_DENT_SIZE(fname_len(&new_nm));
1346 old_sz = CALC_DENT_SIZE(fname_len(&old_nm));
1348 err = ubifs_budget_space(c, &req);
1350 fscrypt_free_filename(&old_nm);
1351 fscrypt_free_filename(&new_nm);
1354 err = ubifs_budget_space(c, &ino_req);
1356 fscrypt_free_filename(&old_nm);
1357 fscrypt_free_filename(&new_nm);
1358 ubifs_release_budget(c, &req);
1362 if (flags & RENAME_WHITEOUT) {
1363 union ubifs_dev_desc *dev = NULL;
1365 dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
1372 * The whiteout inode without dentry is pinned in memory,
1373 * umount won't happen during rename process because we
1374 * got parent dentry.
1376 whiteout = create_whiteout(old_dir, old_dentry);
1377 if (IS_ERR(whiteout)) {
1378 err = PTR_ERR(whiteout);
1383 whiteout_ui = ubifs_inode(whiteout);
1384 whiteout_ui->data = dev;
1385 whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0));
1386 ubifs_assert(c, !whiteout_ui->dirty);
1388 memset(&wht_req, 0, sizeof(struct ubifs_budget_req));
1389 wht_req.new_ino = 1;
1390 wht_req.new_ino_d = ALIGN(whiteout_ui->data_len, 8);
1392 * To avoid deadlock between space budget (holds ui_mutex and
1393 * waits wb work) and writeback work(waits ui_mutex), do space
1394 * budget before ubifs inodes locked.
1396 err = ubifs_budget_space(c, &wht_req);
1399 * Whiteout inode can not be written on flash by
1400 * ubifs_jnl_write_inode(), because it's neither
1401 * dirty nor zero-nlink.
1407 /* Add the old_dentry size to the old_dir size. */
1408 old_sz -= CALC_DENT_SIZE(fname_len(&old_nm));
1411 lock_4_inodes(old_dir, new_dir, new_inode, whiteout);
1414 * Like most other Unix systems, set the @i_ctime for inodes on a
1417 time = current_time(old_dir);
1418 old_inode->i_ctime = time;
1420 /* We must adjust parent link count when renaming directories */
1424 * @old_dir loses a link because we are moving
1425 * @old_inode to a different directory.
1427 drop_nlink(old_dir);
1429 * @new_dir only gains a link if we are not also
1430 * overwriting an existing directory.
1436 * @old_inode is not moving to a different directory,
1437 * but @old_dir still loses a link if we are
1438 * overwriting an existing directory.
1441 drop_nlink(old_dir);
1445 old_dir->i_size -= old_sz;
1446 ubifs_inode(old_dir)->ui_size = old_dir->i_size;
1447 old_dir->i_mtime = old_dir->i_ctime = time;
1448 new_dir->i_mtime = new_dir->i_ctime = time;
1451 * And finally, if we unlinked a direntry which happened to have the
1452 * same name as the moved direntry, we have to decrement @i_nlink of
1453 * the unlinked inode and change its ctime.
1457 * Directories cannot have hard-links, so if this is a
1458 * directory, just clear @i_nlink.
1460 saved_nlink = new_inode->i_nlink;
1462 clear_nlink(new_inode);
1464 drop_nlink(new_inode);
1465 new_inode->i_ctime = time;
1467 new_dir->i_size += new_sz;
1468 ubifs_inode(new_dir)->ui_size = new_dir->i_size;
1472 * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode
1473 * is dirty, because this will be done later on at the end of
1476 if (IS_SYNC(old_inode)) {
1477 sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
1478 if (unlink && IS_SYNC(new_inode))
1481 * S_SYNC flag of whiteout inherits from the old_dir, and we
1482 * have already checked the old dir inode. So there is no need
1483 * to check whiteout.
1487 err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir,
1488 new_inode, &new_nm, whiteout, sync);
1492 unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
1493 ubifs_release_budget(c, &req);
1496 ubifs_release_budget(c, &wht_req);
1500 mutex_lock(&old_inode_ui->ui_mutex);
1501 release = old_inode_ui->dirty;
1502 mark_inode_dirty_sync(old_inode);
1503 mutex_unlock(&old_inode_ui->ui_mutex);
1506 ubifs_release_budget(c, &ino_req);
1507 if (IS_SYNC(old_inode))
1509 * Rename finished here. Although old inode cannot be updated
1510 * on flash, old ctime is not a big problem, don't return err
1511 * code to userspace.
1513 old_inode->i_sb->s_op->write_inode(old_inode, NULL);
1515 fscrypt_free_filename(&old_nm);
1516 fscrypt_free_filename(&new_nm);
1521 set_nlink(new_inode, saved_nlink);
1523 new_dir->i_size -= new_sz;
1524 ubifs_inode(new_dir)->ui_size = new_dir->i_size;
1526 old_dir->i_size += old_sz;
1527 ubifs_inode(old_dir)->ui_size = old_dir->i_size;
1532 drop_nlink(new_dir);
1538 unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
1540 ubifs_release_budget(c, &wht_req);
1544 ubifs_release_budget(c, &ino_req);
1545 ubifs_release_budget(c, &req);
1546 fscrypt_free_filename(&old_nm);
1547 fscrypt_free_filename(&new_nm);
1551 static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
1552 struct inode *new_dir, struct dentry *new_dentry)
1554 struct ubifs_info *c = old_dir->i_sb->s_fs_info;
1555 struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
1557 int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
1558 struct inode *fst_inode = d_inode(old_dentry);
1559 struct inode *snd_inode = d_inode(new_dentry);
1560 struct timespec64 time;
1562 struct fscrypt_name fst_nm, snd_nm;
1564 ubifs_assert(c, fst_inode && snd_inode);
1566 err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm);
1570 err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm);
1572 fscrypt_free_filename(&fst_nm);
1576 lock_4_inodes(old_dir, new_dir, NULL, NULL);
1578 time = current_time(old_dir);
1579 fst_inode->i_ctime = time;
1580 snd_inode->i_ctime = time;
1581 old_dir->i_mtime = old_dir->i_ctime = time;
1582 new_dir->i_mtime = new_dir->i_ctime = time;
1584 if (old_dir != new_dir) {
1585 if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) {
1587 drop_nlink(old_dir);
1589 else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) {
1590 drop_nlink(new_dir);
1595 err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir,
1596 snd_inode, &snd_nm, sync);
1598 unlock_4_inodes(old_dir, new_dir, NULL, NULL);
1599 ubifs_release_budget(c, &req);
1601 fscrypt_free_filename(&fst_nm);
1602 fscrypt_free_filename(&snd_nm);
1606 static int ubifs_rename(struct user_namespace *mnt_userns,
1607 struct inode *old_dir, struct dentry *old_dentry,
1608 struct inode *new_dir, struct dentry *new_dentry,
1612 struct ubifs_info *c = old_dir->i_sb->s_fs_info;
1614 if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE))
1617 ubifs_assert(c, inode_is_locked(old_dir));
1618 ubifs_assert(c, inode_is_locked(new_dir));
1620 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1625 if (flags & RENAME_EXCHANGE)
1626 return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry);
1628 return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1631 int ubifs_getattr(struct user_namespace *mnt_userns, const struct path *path,
1632 struct kstat *stat, u32 request_mask, unsigned int flags)
1635 struct inode *inode = d_inode(path->dentry);
1636 struct ubifs_inode *ui = ubifs_inode(inode);
1638 mutex_lock(&ui->ui_mutex);
1640 if (ui->flags & UBIFS_APPEND_FL)
1641 stat->attributes |= STATX_ATTR_APPEND;
1642 if (ui->flags & UBIFS_COMPR_FL)
1643 stat->attributes |= STATX_ATTR_COMPRESSED;
1644 if (ui->flags & UBIFS_CRYPT_FL)
1645 stat->attributes |= STATX_ATTR_ENCRYPTED;
1646 if (ui->flags & UBIFS_IMMUTABLE_FL)
1647 stat->attributes |= STATX_ATTR_IMMUTABLE;
1649 stat->attributes_mask |= (STATX_ATTR_APPEND |
1650 STATX_ATTR_COMPRESSED |
1651 STATX_ATTR_ENCRYPTED |
1652 STATX_ATTR_IMMUTABLE);
1654 generic_fillattr(&init_user_ns, inode, stat);
1655 stat->blksize = UBIFS_BLOCK_SIZE;
1656 stat->size = ui->ui_size;
1659 * Unfortunately, the 'stat()' system call was designed for block
1660 * device based file systems, and it is not appropriate for UBIFS,
1661 * because UBIFS does not have notion of "block". For example, it is
1662 * difficult to tell how many block a directory takes - it actually
1663 * takes less than 300 bytes, but we have to round it to block size,
1664 * which introduces large mistake. This makes utilities like 'du' to
1665 * report completely senseless numbers. This is the reason why UBIFS
1666 * goes the same way as JFFS2 - it reports zero blocks for everything
1667 * but regular files, which makes more sense than reporting completely
1670 if (S_ISREG(inode->i_mode)) {
1671 size = ui->xattr_size;
1673 size = ALIGN(size, UBIFS_BLOCK_SIZE);
1675 * Note, user-space expects 512-byte blocks count irrespectively
1676 * of what was reported in @stat->size.
1678 stat->blocks = size >> 9;
1681 mutex_unlock(&ui->ui_mutex);
1685 const struct inode_operations ubifs_dir_inode_operations = {
1686 .lookup = ubifs_lookup,
1687 .create = ubifs_create,
1689 .symlink = ubifs_symlink,
1690 .unlink = ubifs_unlink,
1691 .mkdir = ubifs_mkdir,
1692 .rmdir = ubifs_rmdir,
1693 .mknod = ubifs_mknod,
1694 .rename = ubifs_rename,
1695 .setattr = ubifs_setattr,
1696 .getattr = ubifs_getattr,
1697 .listxattr = ubifs_listxattr,
1698 .update_time = ubifs_update_time,
1699 .tmpfile = ubifs_tmpfile,
1700 .fileattr_get = ubifs_fileattr_get,
1701 .fileattr_set = ubifs_fileattr_set,
1704 const struct file_operations ubifs_dir_operations = {
1705 .llseek = generic_file_llseek,
1706 .release = ubifs_dir_release,
1707 .read = generic_read_dir,
1708 .iterate_shared = ubifs_readdir,
1709 .fsync = ubifs_fsync,
1710 .unlocked_ioctl = ubifs_ioctl,
1711 #ifdef CONFIG_COMPAT
1712 .compat_ioctl = ubifs_compat_ioctl,