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, const struct inode *dir,
92 struct ubifs_inode *ui;
94 inode = new_inode(c->vfs_sb);
95 ui = ubifs_inode(inode);
97 return ERR_PTR(-ENOMEM);
100 * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and
101 * marking them dirty in file write path (see 'file_update_time()').
102 * UBIFS has to fully control "clean <-> dirty" transitions of inodes
103 * to make budgeting work.
105 inode->i_flags |= S_NOCMTIME;
107 inode_init_owner(inode, dir, mode);
108 inode->i_mtime = inode->i_atime = inode->i_ctime =
109 ubifs_current_time(inode);
110 inode->i_mapping->nrpages = 0;
112 switch (mode & S_IFMT) {
114 inode->i_mapping->a_ops = &ubifs_file_address_operations;
115 inode->i_op = &ubifs_file_inode_operations;
116 inode->i_fop = &ubifs_file_operations;
119 inode->i_op = &ubifs_dir_inode_operations;
120 inode->i_fop = &ubifs_dir_operations;
121 inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ;
124 inode->i_op = &ubifs_symlink_inode_operations;
130 inode->i_op = &ubifs_file_inode_operations;
136 ui->flags = inherit_flags(dir, mode);
137 ubifs_set_inode_flags(inode);
139 ui->compr_type = c->default_compr;
141 ui->compr_type = UBIFS_COMPR_NONE;
142 ui->synced_i_size = 0;
144 spin_lock(&c->cnt_lock);
145 /* Inode number overflow is currently not supported */
146 if (c->highest_inum >= INUM_WARN_WATERMARK) {
147 if (c->highest_inum >= INUM_WATERMARK) {
148 spin_unlock(&c->cnt_lock);
149 ubifs_err(c, "out of inode numbers");
150 make_bad_inode(inode);
152 return ERR_PTR(-EINVAL);
154 ubifs_warn(c, "running out of inode numbers (current %lu, max %u)",
155 (unsigned long)c->highest_inum, INUM_WATERMARK);
158 inode->i_ino = ++c->highest_inum;
160 * The creation sequence number remains with this inode for its
161 * lifetime. All nodes for this inode have a greater sequence number,
162 * and so it is possible to distinguish obsolete nodes belonging to a
163 * previous incarnation of the same inode number - for example, for the
164 * purpose of rebuilding the index.
166 ui->creat_sqnum = ++c->max_sqnum;
167 spin_unlock(&c->cnt_lock);
171 static int dbg_check_name(const struct ubifs_info *c,
172 const struct ubifs_dent_node *dent,
173 const struct qstr *nm)
175 if (!dbg_is_chk_gen(c))
177 if (le16_to_cpu(dent->nlen) != nm->len)
179 if (memcmp(dent->name, nm->name, nm->len))
184 static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
189 struct inode *inode = NULL;
190 struct ubifs_dent_node *dent;
191 struct ubifs_info *c = dir->i_sb->s_fs_info;
193 dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
195 if (dentry->d_name.len > UBIFS_MAX_NLEN)
196 return ERR_PTR(-ENAMETOOLONG);
198 dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
200 return ERR_PTR(-ENOMEM);
202 dent_key_init(c, &key, dir->i_ino, &dentry->d_name);
204 err = ubifs_tnc_lookup_nm(c, &key, dent, &dentry->d_name);
206 if (err == -ENOENT) {
207 dbg_gen("not found");
213 if (dbg_check_name(c, dent, &dentry->d_name)) {
218 inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
221 * This should not happen. Probably the file-system needs
224 err = PTR_ERR(inode);
225 ubifs_err(c, "dead directory entry '%pd', error %d",
227 ubifs_ro_mode(c, err);
234 * Note, d_splice_alias() would be required instead if we supported
237 d_add(dentry, inode);
245 static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
249 struct ubifs_info *c = dir->i_sb->s_fs_info;
250 int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
251 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
253 struct ubifs_inode *dir_ui = ubifs_inode(dir);
256 * Budget request settings: new inode, new direntry, changing the
257 * parent directory inode.
260 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
261 dentry, mode, dir->i_ino);
263 err = ubifs_budget_space(c, &req);
267 inode = ubifs_new_inode(c, dir, mode);
269 err = PTR_ERR(inode);
273 err = ubifs_init_security(dir, inode, &dentry->d_name);
277 mutex_lock(&dir_ui->ui_mutex);
278 dir->i_size += sz_change;
279 dir_ui->ui_size = dir->i_size;
280 dir->i_mtime = dir->i_ctime = inode->i_ctime;
281 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
284 mutex_unlock(&dir_ui->ui_mutex);
286 ubifs_release_budget(c, &req);
287 insert_inode_hash(inode);
288 d_instantiate(dentry, inode);
292 dir->i_size -= sz_change;
293 dir_ui->ui_size = dir->i_size;
294 mutex_unlock(&dir_ui->ui_mutex);
296 make_bad_inode(inode);
299 ubifs_release_budget(c, &req);
300 ubifs_err(c, "cannot create regular file, error %d", err);
304 static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry,
308 struct ubifs_info *c = dir->i_sb->s_fs_info;
309 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1};
310 struct ubifs_budget_req ino_req = { .dirtied_ino = 1 };
311 struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir);
312 int err, instantiated = 0;
315 * Budget request settings: new dirty inode, new direntry,
316 * budget for dirtied inode will be released via writeback.
319 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
320 dentry, mode, dir->i_ino);
322 err = ubifs_budget_space(c, &req);
326 err = ubifs_budget_space(c, &ino_req);
328 ubifs_release_budget(c, &req);
332 inode = ubifs_new_inode(c, dir, mode);
334 err = PTR_ERR(inode);
337 ui = ubifs_inode(inode);
339 err = ubifs_init_security(dir, inode, &dentry->d_name);
343 mutex_lock(&ui->ui_mutex);
344 insert_inode_hash(inode);
345 d_tmpfile(dentry, inode);
346 ubifs_assert(ui->dirty);
348 mutex_unlock(&ui->ui_mutex);
350 mutex_lock(&dir_ui->ui_mutex);
351 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0);
354 mutex_unlock(&dir_ui->ui_mutex);
356 ubifs_release_budget(c, &req);
361 mutex_unlock(&dir_ui->ui_mutex);
363 make_bad_inode(inode);
367 ubifs_release_budget(c, &req);
369 ubifs_release_budget(c, &ino_req);
370 ubifs_err(c, "cannot create temporary file, error %d", err);
375 * vfs_dent_type - get VFS directory entry type.
376 * @type: UBIFS directory entry type
378 * This function converts UBIFS directory entry type into VFS directory entry
381 static unsigned int vfs_dent_type(uint8_t type)
384 case UBIFS_ITYPE_REG:
386 case UBIFS_ITYPE_DIR:
388 case UBIFS_ITYPE_LNK:
390 case UBIFS_ITYPE_BLK:
392 case UBIFS_ITYPE_CHR:
394 case UBIFS_ITYPE_FIFO:
396 case UBIFS_ITYPE_SOCK:
405 * The classical Unix view for directory is that it is a linear array of
406 * (name, inode number) entries. Linux/VFS assumes this model as well.
407 * Particularly, 'readdir()' call wants us to return a directory entry offset
408 * which later may be used to continue 'readdir()'ing the directory or to
409 * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this
410 * model because directory entries are identified by keys, which may collide.
412 * UBIFS uses directory entry hash value for directory offsets, so
413 * 'seekdir()'/'telldir()' may not always work because of possible key
414 * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work
415 * properly by means of saving full directory entry name in the private field
416 * of the file description object.
418 * This means that UBIFS cannot support NFS which requires full
419 * 'seekdir()'/'telldir()' support.
421 static int ubifs_readdir(struct file *file, struct dir_context *ctx)
426 struct ubifs_dent_node *dent;
427 struct inode *dir = file_inode(file);
428 struct ubifs_info *c = dir->i_sb->s_fs_info;
430 dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos);
432 if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2)
434 * The directory was seek'ed to a senseless position or there
435 * are no more entries.
439 if (file->f_version == 0) {
441 * The file was seek'ed, which means that @file->private_data
442 * is now invalid. This may also be just the first
443 * 'ubifs_readdir()' invocation, in which case
444 * @file->private_data is NULL, and the below code is
447 kfree(file->private_data);
448 file->private_data = NULL;
452 * 'generic_file_llseek()' unconditionally sets @file->f_version to
453 * zero, and we use this for detecting whether the file was seek'ed.
457 /* File positions 0 and 1 correspond to "." and ".." */
459 ubifs_assert(!file->private_data);
460 if (!dir_emit_dots(file, ctx))
463 /* Find the first entry in TNC and save it */
464 lowest_dent_key(c, &key, dir->i_ino);
466 dent = ubifs_tnc_next_ent(c, &key, &nm);
472 ctx->pos = key_hash_flash(c, &dent->key);
473 file->private_data = dent;
476 dent = file->private_data;
479 * The directory was seek'ed to and is now readdir'ed.
480 * Find the entry corresponding to @ctx->pos or the closest one.
482 dent_key_init_hash(c, &key, dir->i_ino, ctx->pos);
484 dent = ubifs_tnc_next_ent(c, &key, &nm);
489 ctx->pos = key_hash_flash(c, &dent->key);
490 file->private_data = dent;
494 dbg_gen("feed '%s', ino %llu, new f_pos %#x",
495 dent->name, (unsigned long long)le64_to_cpu(dent->inum),
496 key_hash_flash(c, &dent->key));
497 ubifs_assert(le64_to_cpu(dent->ch.sqnum) >
498 ubifs_inode(dir)->creat_sqnum);
500 nm.len = le16_to_cpu(dent->nlen);
501 if (!dir_emit(ctx, dent->name, nm.len,
502 le64_to_cpu(dent->inum),
503 vfs_dent_type(dent->type)))
506 /* Switch to the next entry */
507 key_read(c, &dent->key, &key);
508 nm.name = dent->name;
509 dent = ubifs_tnc_next_ent(c, &key, &nm);
515 kfree(file->private_data);
516 ctx->pos = key_hash_flash(c, &dent->key);
517 file->private_data = dent;
522 kfree(file->private_data);
523 file->private_data = NULL;
525 if (err != -ENOENT) {
526 ubifs_err(c, "cannot find next direntry, error %d", err);
530 /* 2 is a special value indicating that there are no more direntries */
535 /* Free saved readdir() state when the directory is closed */
536 static int ubifs_dir_release(struct inode *dir, struct file *file)
538 kfree(file->private_data);
539 file->private_data = NULL;
544 * lock_2_inodes - a wrapper for locking two UBIFS inodes.
545 * @inode1: first inode
546 * @inode2: second inode
548 * We do not implement any tricks to guarantee strict lock ordering, because
549 * VFS has already done it for us on the @i_mutex. So this is just a simple
552 static void lock_2_inodes(struct inode *inode1, struct inode *inode2)
554 mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
555 mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
559 * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes.
560 * @inode1: first inode
561 * @inode2: second inode
563 static void unlock_2_inodes(struct inode *inode1, struct inode *inode2)
565 mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
566 mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
569 static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
570 struct dentry *dentry)
572 struct ubifs_info *c = dir->i_sb->s_fs_info;
573 struct inode *inode = d_inode(old_dentry);
574 struct ubifs_inode *ui = ubifs_inode(inode);
575 struct ubifs_inode *dir_ui = ubifs_inode(dir);
576 int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
577 struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2,
578 .dirtied_ino_d = ALIGN(ui->data_len, 8) };
581 * Budget request settings: new direntry, changing the target inode,
582 * changing the parent inode.
585 dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu",
586 dentry, inode->i_ino,
587 inode->i_nlink, dir->i_ino);
588 ubifs_assert(inode_is_locked(dir));
589 ubifs_assert(inode_is_locked(inode));
591 err = dbg_check_synced_i_size(c, inode);
595 err = ubifs_budget_space(c, &req);
599 lock_2_inodes(dir, inode);
602 inode->i_ctime = ubifs_current_time(inode);
603 dir->i_size += sz_change;
604 dir_ui->ui_size = dir->i_size;
605 dir->i_mtime = dir->i_ctime = inode->i_ctime;
606 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
609 unlock_2_inodes(dir, inode);
611 ubifs_release_budget(c, &req);
612 d_instantiate(dentry, inode);
616 dir->i_size -= sz_change;
617 dir_ui->ui_size = dir->i_size;
619 unlock_2_inodes(dir, inode);
620 ubifs_release_budget(c, &req);
625 static int ubifs_unlink(struct inode *dir, struct dentry *dentry)
627 struct ubifs_info *c = dir->i_sb->s_fs_info;
628 struct inode *inode = d_inode(dentry);
629 struct ubifs_inode *dir_ui = ubifs_inode(dir);
630 int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
631 int err, budgeted = 1;
632 struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
633 unsigned int saved_nlink = inode->i_nlink;
636 * Budget request settings: deletion direntry, deletion inode (+1 for
637 * @dirtied_ino), changing the parent directory inode. If budgeting
638 * fails, go ahead anyway because we have extra space reserved for
642 dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu",
643 dentry, inode->i_ino,
644 inode->i_nlink, dir->i_ino);
645 ubifs_assert(inode_is_locked(dir));
646 ubifs_assert(inode_is_locked(inode));
647 err = dbg_check_synced_i_size(c, inode);
651 err = ubifs_budget_space(c, &req);
658 lock_2_inodes(dir, inode);
659 inode->i_ctime = ubifs_current_time(dir);
661 dir->i_size -= sz_change;
662 dir_ui->ui_size = dir->i_size;
663 dir->i_mtime = dir->i_ctime = inode->i_ctime;
664 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0);
667 unlock_2_inodes(dir, inode);
670 ubifs_release_budget(c, &req);
672 /* We've deleted something - clean the "no space" flags */
673 c->bi.nospace = c->bi.nospace_rp = 0;
679 dir->i_size += sz_change;
680 dir_ui->ui_size = dir->i_size;
681 set_nlink(inode, saved_nlink);
682 unlock_2_inodes(dir, inode);
684 ubifs_release_budget(c, &req);
689 * check_dir_empty - check if a directory is empty or not.
690 * @c: UBIFS file-system description object
691 * @dir: VFS inode object of the directory to check
693 * This function checks if directory @dir is empty. Returns zero if the
694 * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes
695 * in case of of errors.
697 static int check_dir_empty(struct ubifs_info *c, struct inode *dir)
699 struct qstr nm = { .name = NULL };
700 struct ubifs_dent_node *dent;
704 lowest_dent_key(c, &key, dir->i_ino);
705 dent = ubifs_tnc_next_ent(c, &key, &nm);
717 static int ubifs_rmdir(struct inode *dir, struct dentry *dentry)
719 struct ubifs_info *c = dir->i_sb->s_fs_info;
720 struct inode *inode = d_inode(dentry);
721 int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
722 int err, budgeted = 1;
723 struct ubifs_inode *dir_ui = ubifs_inode(dir);
724 struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
727 * Budget request settings: deletion direntry, deletion inode and
728 * changing the parent inode. If budgeting fails, go ahead anyway
729 * because we have extra space reserved for deletions.
732 dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry,
733 inode->i_ino, dir->i_ino);
734 ubifs_assert(inode_is_locked(dir));
735 ubifs_assert(inode_is_locked(inode));
736 err = check_dir_empty(c, d_inode(dentry));
740 err = ubifs_budget_space(c, &req);
747 lock_2_inodes(dir, inode);
748 inode->i_ctime = ubifs_current_time(dir);
751 dir->i_size -= sz_change;
752 dir_ui->ui_size = dir->i_size;
753 dir->i_mtime = dir->i_ctime = inode->i_ctime;
754 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0);
757 unlock_2_inodes(dir, inode);
760 ubifs_release_budget(c, &req);
762 /* We've deleted something - clean the "no space" flags */
763 c->bi.nospace = c->bi.nospace_rp = 0;
769 dir->i_size += sz_change;
770 dir_ui->ui_size = dir->i_size;
773 unlock_2_inodes(dir, inode);
775 ubifs_release_budget(c, &req);
779 static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
782 struct ubifs_inode *dir_ui = ubifs_inode(dir);
783 struct ubifs_info *c = dir->i_sb->s_fs_info;
784 int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
785 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 };
788 * Budget request settings: new inode, new direntry and changing parent
792 dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
793 dentry, mode, dir->i_ino);
795 err = ubifs_budget_space(c, &req);
799 inode = ubifs_new_inode(c, dir, S_IFDIR | mode);
801 err = PTR_ERR(inode);
805 err = ubifs_init_security(dir, inode, &dentry->d_name);
809 mutex_lock(&dir_ui->ui_mutex);
810 insert_inode_hash(inode);
813 dir->i_size += sz_change;
814 dir_ui->ui_size = dir->i_size;
815 dir->i_mtime = dir->i_ctime = inode->i_ctime;
816 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
818 ubifs_err(c, "cannot create directory, error %d", err);
821 mutex_unlock(&dir_ui->ui_mutex);
823 ubifs_release_budget(c, &req);
824 d_instantiate(dentry, inode);
828 dir->i_size -= sz_change;
829 dir_ui->ui_size = dir->i_size;
831 mutex_unlock(&dir_ui->ui_mutex);
833 make_bad_inode(inode);
836 ubifs_release_budget(c, &req);
840 static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
841 umode_t mode, dev_t rdev)
844 struct ubifs_inode *ui;
845 struct ubifs_inode *dir_ui = ubifs_inode(dir);
846 struct ubifs_info *c = dir->i_sb->s_fs_info;
847 union ubifs_dev_desc *dev = NULL;
848 int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
850 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
851 .new_ino_d = ALIGN(devlen, 8),
855 * Budget request settings: new inode, new direntry and changing parent
859 dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino);
861 if (S_ISBLK(mode) || S_ISCHR(mode)) {
862 dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
865 devlen = ubifs_encode_dev(dev, rdev);
868 err = ubifs_budget_space(c, &req);
874 inode = ubifs_new_inode(c, dir, mode);
877 err = PTR_ERR(inode);
881 init_special_inode(inode, inode->i_mode, rdev);
882 inode->i_size = ubifs_inode(inode)->ui_size = devlen;
883 ui = ubifs_inode(inode);
885 ui->data_len = devlen;
887 err = ubifs_init_security(dir, inode, &dentry->d_name);
891 mutex_lock(&dir_ui->ui_mutex);
892 dir->i_size += sz_change;
893 dir_ui->ui_size = dir->i_size;
894 dir->i_mtime = dir->i_ctime = inode->i_ctime;
895 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
898 mutex_unlock(&dir_ui->ui_mutex);
900 ubifs_release_budget(c, &req);
901 insert_inode_hash(inode);
902 d_instantiate(dentry, inode);
906 dir->i_size -= sz_change;
907 dir_ui->ui_size = dir->i_size;
908 mutex_unlock(&dir_ui->ui_mutex);
910 make_bad_inode(inode);
913 ubifs_release_budget(c, &req);
917 static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
921 struct ubifs_inode *ui;
922 struct ubifs_inode *dir_ui = ubifs_inode(dir);
923 struct ubifs_info *c = dir->i_sb->s_fs_info;
924 int err, len = strlen(symname);
925 int sz_change = CALC_DENT_SIZE(dentry->d_name.len);
926 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
927 .new_ino_d = ALIGN(len, 8),
931 * Budget request settings: new inode, new direntry and changing parent
935 dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
936 symname, dir->i_ino);
938 if (len > UBIFS_MAX_INO_DATA)
939 return -ENAMETOOLONG;
941 err = ubifs_budget_space(c, &req);
945 inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO);
947 err = PTR_ERR(inode);
951 ui = ubifs_inode(inode);
952 ui->data = kmalloc(len + 1, GFP_NOFS);
958 memcpy(ui->data, symname, len);
959 ((char *)ui->data)[len] = '\0';
960 inode->i_link = ui->data;
962 * The terminating zero byte is not written to the flash media and it
963 * is put just to make later in-memory string processing simpler. Thus,
964 * data length is @len, not @len + %1.
967 inode->i_size = ubifs_inode(inode)->ui_size = len;
969 err = ubifs_init_security(dir, inode, &dentry->d_name);
973 mutex_lock(&dir_ui->ui_mutex);
974 dir->i_size += sz_change;
975 dir_ui->ui_size = dir->i_size;
976 dir->i_mtime = dir->i_ctime = inode->i_ctime;
977 err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0);
980 mutex_unlock(&dir_ui->ui_mutex);
982 ubifs_release_budget(c, &req);
983 insert_inode_hash(inode);
984 d_instantiate(dentry, inode);
988 dir->i_size -= sz_change;
989 dir_ui->ui_size = dir->i_size;
990 mutex_unlock(&dir_ui->ui_mutex);
992 make_bad_inode(inode);
995 ubifs_release_budget(c, &req);
1000 * lock_3_inodes - a wrapper for locking three UBIFS inodes.
1001 * @inode1: first inode
1002 * @inode2: second inode
1003 * @inode3: third inode
1005 * This function is used for 'ubifs_rename()' and @inode1 may be the same as
1006 * @inode2 whereas @inode3 may be %NULL.
1008 * We do not implement any tricks to guarantee strict lock ordering, because
1009 * VFS has already done it for us on the @i_mutex. So this is just a simple
1012 static void lock_3_inodes(struct inode *inode1, struct inode *inode2,
1013 struct inode *inode3)
1015 mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
1016 if (inode2 != inode1)
1017 mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
1019 mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
1023 * unlock_3_inodes - a wrapper for unlocking three UBIFS inodes for rename.
1024 * @inode1: first inode
1025 * @inode2: second inode
1026 * @inode3: third inode
1028 static void unlock_3_inodes(struct inode *inode1, struct inode *inode2,
1029 struct inode *inode3)
1032 mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
1033 if (inode1 != inode2)
1034 mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
1035 mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
1038 static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
1039 struct inode *new_dir, struct dentry *new_dentry)
1041 struct ubifs_info *c = old_dir->i_sb->s_fs_info;
1042 struct inode *old_inode = d_inode(old_dentry);
1043 struct inode *new_inode = d_inode(new_dentry);
1044 struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
1045 int err, release, sync = 0, move = (new_dir != old_dir);
1046 int is_dir = S_ISDIR(old_inode->i_mode);
1047 int unlink = !!new_inode;
1048 int new_sz = CALC_DENT_SIZE(new_dentry->d_name.len);
1049 int old_sz = CALC_DENT_SIZE(old_dentry->d_name.len);
1050 struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
1052 struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
1053 .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
1054 struct timespec time;
1055 unsigned int uninitialized_var(saved_nlink);
1058 * Budget request settings: deletion direntry, new direntry, removing
1059 * the old inode, and changing old and new parent directory inodes.
1061 * However, this operation also marks the target inode as dirty and
1062 * does not write it, so we allocate budget for the target inode
1066 dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu",
1067 old_dentry, old_inode->i_ino, old_dir->i_ino,
1068 new_dentry, new_dir->i_ino);
1069 ubifs_assert(inode_is_locked(old_dir));
1070 ubifs_assert(inode_is_locked(new_dir));
1072 ubifs_assert(inode_is_locked(new_inode));
1075 if (unlink && is_dir) {
1076 err = check_dir_empty(c, new_inode);
1081 err = ubifs_budget_space(c, &req);
1084 err = ubifs_budget_space(c, &ino_req);
1086 ubifs_release_budget(c, &req);
1090 lock_3_inodes(old_dir, new_dir, new_inode);
1093 * Like most other Unix systems, set the @i_ctime for inodes on a
1096 time = ubifs_current_time(old_dir);
1097 old_inode->i_ctime = time;
1099 /* We must adjust parent link count when renaming directories */
1103 * @old_dir loses a link because we are moving
1104 * @old_inode to a different directory.
1106 drop_nlink(old_dir);
1108 * @new_dir only gains a link if we are not also
1109 * overwriting an existing directory.
1115 * @old_inode is not moving to a different directory,
1116 * but @old_dir still loses a link if we are
1117 * overwriting an existing directory.
1120 drop_nlink(old_dir);
1124 old_dir->i_size -= old_sz;
1125 ubifs_inode(old_dir)->ui_size = old_dir->i_size;
1126 old_dir->i_mtime = old_dir->i_ctime = time;
1127 new_dir->i_mtime = new_dir->i_ctime = time;
1130 * And finally, if we unlinked a direntry which happened to have the
1131 * same name as the moved direntry, we have to decrement @i_nlink of
1132 * the unlinked inode and change its ctime.
1136 * Directories cannot have hard-links, so if this is a
1137 * directory, just clear @i_nlink.
1139 saved_nlink = new_inode->i_nlink;
1141 clear_nlink(new_inode);
1143 drop_nlink(new_inode);
1144 new_inode->i_ctime = time;
1146 new_dir->i_size += new_sz;
1147 ubifs_inode(new_dir)->ui_size = new_dir->i_size;
1151 * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode
1152 * is dirty, because this will be done later on at the end of
1155 if (IS_SYNC(old_inode)) {
1156 sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
1157 if (unlink && IS_SYNC(new_inode))
1160 err = ubifs_jnl_rename(c, old_dir, old_dentry, new_dir, new_dentry,
1165 unlock_3_inodes(old_dir, new_dir, new_inode);
1166 ubifs_release_budget(c, &req);
1168 mutex_lock(&old_inode_ui->ui_mutex);
1169 release = old_inode_ui->dirty;
1170 mark_inode_dirty_sync(old_inode);
1171 mutex_unlock(&old_inode_ui->ui_mutex);
1174 ubifs_release_budget(c, &ino_req);
1175 if (IS_SYNC(old_inode))
1176 err = old_inode->i_sb->s_op->write_inode(old_inode, NULL);
1181 set_nlink(new_inode, saved_nlink);
1183 new_dir->i_size -= new_sz;
1184 ubifs_inode(new_dir)->ui_size = new_dir->i_size;
1186 old_dir->i_size += old_sz;
1187 ubifs_inode(old_dir)->ui_size = old_dir->i_size;
1192 drop_nlink(new_dir);
1198 unlock_3_inodes(old_dir, new_dir, new_inode);
1199 ubifs_release_budget(c, &ino_req);
1200 ubifs_release_budget(c, &req);
1204 int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1208 struct inode *inode = d_inode(dentry);
1209 struct ubifs_inode *ui = ubifs_inode(inode);
1211 mutex_lock(&ui->ui_mutex);
1212 generic_fillattr(inode, stat);
1213 stat->blksize = UBIFS_BLOCK_SIZE;
1214 stat->size = ui->ui_size;
1217 * Unfortunately, the 'stat()' system call was designed for block
1218 * device based file systems, and it is not appropriate for UBIFS,
1219 * because UBIFS does not have notion of "block". For example, it is
1220 * difficult to tell how many block a directory takes - it actually
1221 * takes less than 300 bytes, but we have to round it to block size,
1222 * which introduces large mistake. This makes utilities like 'du' to
1223 * report completely senseless numbers. This is the reason why UBIFS
1224 * goes the same way as JFFS2 - it reports zero blocks for everything
1225 * but regular files, which makes more sense than reporting completely
1228 if (S_ISREG(inode->i_mode)) {
1229 size = ui->xattr_size;
1231 size = ALIGN(size, UBIFS_BLOCK_SIZE);
1233 * Note, user-space expects 512-byte blocks count irrespectively
1234 * of what was reported in @stat->size.
1236 stat->blocks = size >> 9;
1239 mutex_unlock(&ui->ui_mutex);
1243 const struct inode_operations ubifs_dir_inode_operations = {
1244 .lookup = ubifs_lookup,
1245 .create = ubifs_create,
1247 .symlink = ubifs_symlink,
1248 .unlink = ubifs_unlink,
1249 .mkdir = ubifs_mkdir,
1250 .rmdir = ubifs_rmdir,
1251 .mknod = ubifs_mknod,
1252 .rename = ubifs_rename,
1253 .setattr = ubifs_setattr,
1254 .getattr = ubifs_getattr,
1255 .setxattr = generic_setxattr,
1256 .getxattr = generic_getxattr,
1257 .listxattr = ubifs_listxattr,
1258 .removexattr = generic_removexattr,
1259 #ifdef CONFIG_UBIFS_ATIME_SUPPORT
1260 .update_time = ubifs_update_time,
1262 .tmpfile = ubifs_tmpfile,
1265 const struct file_operations ubifs_dir_operations = {
1266 .llseek = generic_file_llseek,
1267 .release = ubifs_dir_release,
1268 .read = generic_read_dir,
1269 .iterate_shared = ubifs_readdir,
1270 .fsync = ubifs_fsync,
1271 .unlocked_ioctl = ubifs_ioctl,
1272 #ifdef CONFIG_COMPAT
1273 .compat_ioctl = ubifs_compat_ioctl,