1 // SPDX-License-Identifier: GPL-2.0-only
3 * This file is part of UBIFS.
5 * Copyright (C) 2006-2008 Nokia Corporation.
7 * Authors: Artem Bityutskiy (Битюцкий Артём)
12 * This file implements UBIFS initialization and VFS superblock operations. Some
13 * initialization stuff which is rather large and complex is placed at
14 * corresponding subsystems, but most of it is here.
17 #include <linux/init.h>
18 #include <linux/slab.h>
19 #include <linux/module.h>
20 #include <linux/ctype.h>
21 #include <linux/kthread.h>
22 #include <linux/parser.h>
23 #include <linux/seq_file.h>
24 #include <linux/mount.h>
25 #include <linux/math64.h>
26 #include <linux/writeback.h>
29 static int ubifs_default_version_set(const char *val, const struct kernel_param *kp)
33 ret = kstrtoint(val, 10, &n);
34 if (ret != 0 || n < 4 || n > UBIFS_FORMAT_VERSION)
36 return param_set_int(val, kp);
39 static const struct kernel_param_ops ubifs_default_version_ops = {
40 .set = ubifs_default_version_set,
44 int ubifs_default_version = UBIFS_FORMAT_VERSION;
45 module_param_cb(default_version, &ubifs_default_version_ops, &ubifs_default_version, 0600);
48 * Maximum amount of memory we may 'kmalloc()' without worrying that we are
49 * allocating too much.
51 #define UBIFS_KMALLOC_OK (128*1024)
53 /* Slab cache for UBIFS inodes */
54 static struct kmem_cache *ubifs_inode_slab;
56 /* UBIFS TNC shrinker description */
57 static struct shrinker ubifs_shrinker_info = {
58 .scan_objects = ubifs_shrink_scan,
59 .count_objects = ubifs_shrink_count,
60 .seeks = DEFAULT_SEEKS,
64 * validate_inode - validate inode.
65 * @c: UBIFS file-system description object
66 * @inode: the inode to validate
68 * This is a helper function for 'ubifs_iget()' which validates various fields
69 * of a newly built inode to make sure they contain sane values and prevent
70 * possible vulnerabilities. Returns zero if the inode is all right and
71 * a non-zero error code if not.
73 static int validate_inode(struct ubifs_info *c, const struct inode *inode)
76 const struct ubifs_inode *ui = ubifs_inode(inode);
78 if (inode->i_size > c->max_inode_sz) {
79 ubifs_err(c, "inode is too large (%lld)",
80 (long long)inode->i_size);
84 if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
85 ubifs_err(c, "unknown compression type %d", ui->compr_type);
89 if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX)
92 if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA)
95 if (ui->xattr && !S_ISREG(inode->i_mode))
98 if (!ubifs_compr_present(c, ui->compr_type)) {
99 ubifs_warn(c, "inode %lu uses '%s' compression, but it was not compiled in",
100 inode->i_ino, ubifs_compr_name(c, ui->compr_type));
103 err = dbg_check_dir(c, inode);
107 struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
111 struct ubifs_ino_node *ino;
112 struct ubifs_info *c = sb->s_fs_info;
114 struct ubifs_inode *ui;
116 dbg_gen("inode %lu", inum);
118 inode = iget_locked(sb, inum);
120 return ERR_PTR(-ENOMEM);
121 if (!(inode->i_state & I_NEW))
123 ui = ubifs_inode(inode);
125 ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
131 ino_key_init(c, &key, inode->i_ino);
133 err = ubifs_tnc_lookup(c, &key, ino);
137 inode->i_flags |= S_NOCMTIME;
139 if (!IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT))
140 inode->i_flags |= S_NOATIME;
142 set_nlink(inode, le32_to_cpu(ino->nlink));
143 i_uid_write(inode, le32_to_cpu(ino->uid));
144 i_gid_write(inode, le32_to_cpu(ino->gid));
145 inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec);
146 inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec);
147 inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec);
148 inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec);
149 inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec);
150 inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec);
151 inode->i_mode = le32_to_cpu(ino->mode);
152 inode->i_size = le64_to_cpu(ino->size);
154 ui->data_len = le32_to_cpu(ino->data_len);
155 ui->flags = le32_to_cpu(ino->flags);
156 ui->compr_type = le16_to_cpu(ino->compr_type);
157 ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
158 ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
159 ui->xattr_size = le32_to_cpu(ino->xattr_size);
160 ui->xattr_names = le32_to_cpu(ino->xattr_names);
161 ui->synced_i_size = ui->ui_size = inode->i_size;
163 ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0;
165 err = validate_inode(c, inode);
169 switch (inode->i_mode & S_IFMT) {
171 inode->i_mapping->a_ops = &ubifs_file_address_operations;
172 inode->i_op = &ubifs_file_inode_operations;
173 inode->i_fop = &ubifs_file_operations;
175 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
180 memcpy(ui->data, ino->data, ui->data_len);
181 ((char *)ui->data)[ui->data_len] = '\0';
182 } else if (ui->data_len != 0) {
188 inode->i_op = &ubifs_dir_inode_operations;
189 inode->i_fop = &ubifs_dir_operations;
190 if (ui->data_len != 0) {
196 inode->i_op = &ubifs_symlink_inode_operations;
197 if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
201 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
206 memcpy(ui->data, ino->data, ui->data_len);
207 ((char *)ui->data)[ui->data_len] = '\0';
213 union ubifs_dev_desc *dev;
215 ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
221 dev = (union ubifs_dev_desc *)ino->data;
222 if (ui->data_len == sizeof(dev->new))
223 rdev = new_decode_dev(le32_to_cpu(dev->new));
224 else if (ui->data_len == sizeof(dev->huge))
225 rdev = huge_decode_dev(le64_to_cpu(dev->huge));
230 memcpy(ui->data, ino->data, ui->data_len);
231 inode->i_op = &ubifs_file_inode_operations;
232 init_special_inode(inode, inode->i_mode, rdev);
237 inode->i_op = &ubifs_file_inode_operations;
238 init_special_inode(inode, inode->i_mode, 0);
239 if (ui->data_len != 0) {
250 ubifs_set_inode_flags(inode);
251 unlock_new_inode(inode);
255 ubifs_err(c, "inode %lu validation failed, error %d", inode->i_ino, err);
256 ubifs_dump_node(c, ino);
257 ubifs_dump_inode(c, inode);
262 ubifs_err(c, "failed to read inode %lu, error %d", inode->i_ino, err);
267 static struct inode *ubifs_alloc_inode(struct super_block *sb)
269 struct ubifs_inode *ui;
271 ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS);
275 memset((void *)ui + sizeof(struct inode), 0,
276 sizeof(struct ubifs_inode) - sizeof(struct inode));
277 mutex_init(&ui->ui_mutex);
278 spin_lock_init(&ui->ui_lock);
279 return &ui->vfs_inode;
282 static void ubifs_free_inode(struct inode *inode)
284 struct ubifs_inode *ui = ubifs_inode(inode);
287 fscrypt_free_inode(inode);
289 kmem_cache_free(ubifs_inode_slab, ui);
293 * Note, Linux write-back code calls this without 'i_mutex'.
295 static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
298 struct ubifs_info *c = inode->i_sb->s_fs_info;
299 struct ubifs_inode *ui = ubifs_inode(inode);
301 ubifs_assert(c, !ui->xattr);
302 if (is_bad_inode(inode))
305 mutex_lock(&ui->ui_mutex);
307 * Due to races between write-back forced by budgeting
308 * (see 'sync_some_inodes()') and background write-back, the inode may
309 * have already been synchronized, do not do this again. This might
310 * also happen if it was synchronized in an VFS operation, e.g.
314 mutex_unlock(&ui->ui_mutex);
319 * As an optimization, do not write orphan inodes to the media just
320 * because this is not needed.
322 dbg_gen("inode %lu, mode %#x, nlink %u",
323 inode->i_ino, (int)inode->i_mode, inode->i_nlink);
324 if (inode->i_nlink) {
325 err = ubifs_jnl_write_inode(c, inode);
327 ubifs_err(c, "can't write inode %lu, error %d",
330 err = dbg_check_inode_size(c, inode, ui->ui_size);
334 mutex_unlock(&ui->ui_mutex);
335 ubifs_release_dirty_inode_budget(c, ui);
339 static int ubifs_drop_inode(struct inode *inode)
341 int drop = generic_drop_inode(inode);
344 drop = fscrypt_drop_inode(inode);
349 static void ubifs_evict_inode(struct inode *inode)
352 struct ubifs_info *c = inode->i_sb->s_fs_info;
353 struct ubifs_inode *ui = ubifs_inode(inode);
357 * Extended attribute inode deletions are fully handled in
358 * 'ubifs_removexattr()'. These inodes are special and have
359 * limited usage, so there is nothing to do here.
363 dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
364 ubifs_assert(c, !atomic_read(&inode->i_count));
366 truncate_inode_pages_final(&inode->i_data);
371 if (is_bad_inode(inode))
374 ui->ui_size = inode->i_size = 0;
375 err = ubifs_jnl_delete_inode(c, inode);
378 * Worst case we have a lost orphan inode wasting space, so a
379 * simple error message is OK here.
381 ubifs_err(c, "can't delete inode %lu, error %d",
386 ubifs_release_dirty_inode_budget(c, ui);
388 /* We've deleted something - clean the "no space" flags */
389 c->bi.nospace = c->bi.nospace_rp = 0;
394 fscrypt_put_encryption_info(inode);
397 static void ubifs_dirty_inode(struct inode *inode, int flags)
399 struct ubifs_info *c = inode->i_sb->s_fs_info;
400 struct ubifs_inode *ui = ubifs_inode(inode);
402 ubifs_assert(c, mutex_is_locked(&ui->ui_mutex));
405 dbg_gen("inode %lu", inode->i_ino);
409 static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
411 struct ubifs_info *c = dentry->d_sb->s_fs_info;
412 unsigned long long free;
413 __le32 *uuid = (__le32 *)c->uuid;
415 free = ubifs_get_free_space(c);
416 dbg_gen("free space %lld bytes (%lld blocks)",
417 free, free >> UBIFS_BLOCK_SHIFT);
419 buf->f_type = UBIFS_SUPER_MAGIC;
420 buf->f_bsize = UBIFS_BLOCK_SIZE;
421 buf->f_blocks = c->block_cnt;
422 buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
423 if (free > c->report_rp_size)
424 buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
429 buf->f_namelen = UBIFS_MAX_NLEN;
430 buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
431 buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
432 ubifs_assert(c, buf->f_bfree <= c->block_cnt);
436 static int ubifs_show_options(struct seq_file *s, struct dentry *root)
438 struct ubifs_info *c = root->d_sb->s_fs_info;
440 if (c->mount_opts.unmount_mode == 2)
441 seq_puts(s, ",fast_unmount");
442 else if (c->mount_opts.unmount_mode == 1)
443 seq_puts(s, ",norm_unmount");
445 if (c->mount_opts.bulk_read == 2)
446 seq_puts(s, ",bulk_read");
447 else if (c->mount_opts.bulk_read == 1)
448 seq_puts(s, ",no_bulk_read");
450 if (c->mount_opts.chk_data_crc == 2)
451 seq_puts(s, ",chk_data_crc");
452 else if (c->mount_opts.chk_data_crc == 1)
453 seq_puts(s, ",no_chk_data_crc");
455 if (c->mount_opts.override_compr) {
456 seq_printf(s, ",compr=%s",
457 ubifs_compr_name(c, c->mount_opts.compr_type));
460 seq_printf(s, ",assert=%s", ubifs_assert_action_name(c));
461 seq_printf(s, ",ubi=%d,vol=%d", c->vi.ubi_num, c->vi.vol_id);
466 static int ubifs_sync_fs(struct super_block *sb, int wait)
469 struct ubifs_info *c = sb->s_fs_info;
472 * Zero @wait is just an advisory thing to help the file system shove
473 * lots of data into the queues, and there will be the second
474 * '->sync_fs()' call, with non-zero @wait.
480 * Synchronize write buffers, because 'ubifs_run_commit()' does not
481 * do this if it waits for an already running commit.
483 for (i = 0; i < c->jhead_cnt; i++) {
484 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
490 * Strictly speaking, it is not necessary to commit the journal here,
491 * synchronizing write-buffers would be enough. But committing makes
492 * UBIFS free space predictions much more accurate, so we want to let
493 * the user be able to get more accurate results of 'statfs()' after
494 * they synchronize the file system.
496 err = ubifs_run_commit(c);
500 return ubi_sync(c->vi.ubi_num);
504 * init_constants_early - initialize UBIFS constants.
505 * @c: UBIFS file-system description object
507 * This function initialize UBIFS constants which do not need the superblock to
508 * be read. It also checks that the UBI volume satisfies basic UBIFS
509 * requirements. Returns zero in case of success and a negative error code in
512 static int init_constants_early(struct ubifs_info *c)
514 if (c->vi.corrupted) {
515 ubifs_warn(c, "UBI volume is corrupted - read-only mode");
520 ubifs_msg(c, "read-only UBI device");
524 if (c->vi.vol_type == UBI_STATIC_VOLUME) {
525 ubifs_msg(c, "static UBI volume - read-only mode");
529 c->leb_cnt = c->vi.size;
530 c->leb_size = c->vi.usable_leb_size;
531 c->leb_start = c->di.leb_start;
532 c->half_leb_size = c->leb_size / 2;
533 c->min_io_size = c->di.min_io_size;
534 c->min_io_shift = fls(c->min_io_size) - 1;
535 c->max_write_size = c->di.max_write_size;
536 c->max_write_shift = fls(c->max_write_size) - 1;
538 if (c->leb_size < UBIFS_MIN_LEB_SZ) {
539 ubifs_errc(c, "too small LEBs (%d bytes), min. is %d bytes",
540 c->leb_size, UBIFS_MIN_LEB_SZ);
544 if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
545 ubifs_errc(c, "too few LEBs (%d), min. is %d",
546 c->leb_cnt, UBIFS_MIN_LEB_CNT);
550 if (!is_power_of_2(c->min_io_size)) {
551 ubifs_errc(c, "bad min. I/O size %d", c->min_io_size);
556 * Maximum write size has to be greater or equivalent to min. I/O
557 * size, and be multiple of min. I/O size.
559 if (c->max_write_size < c->min_io_size ||
560 c->max_write_size % c->min_io_size ||
561 !is_power_of_2(c->max_write_size)) {
562 ubifs_errc(c, "bad write buffer size %d for %d min. I/O unit",
563 c->max_write_size, c->min_io_size);
568 * UBIFS aligns all node to 8-byte boundary, so to make function in
569 * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
572 if (c->min_io_size < 8) {
575 if (c->max_write_size < c->min_io_size) {
576 c->max_write_size = c->min_io_size;
577 c->max_write_shift = c->min_io_shift;
581 c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
582 c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size);
585 * Initialize node length ranges which are mostly needed for node
588 c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ;
589 c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ;
590 c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ;
591 c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
592 c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
593 c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
594 c->ranges[UBIFS_AUTH_NODE].min_len = UBIFS_AUTH_NODE_SZ;
595 c->ranges[UBIFS_AUTH_NODE].max_len = UBIFS_AUTH_NODE_SZ +
597 c->ranges[UBIFS_SIG_NODE].min_len = UBIFS_SIG_NODE_SZ;
598 c->ranges[UBIFS_SIG_NODE].max_len = c->leb_size - UBIFS_SB_NODE_SZ;
600 c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
601 c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
602 c->ranges[UBIFS_ORPH_NODE].min_len =
603 UBIFS_ORPH_NODE_SZ + sizeof(__le64);
604 c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size;
605 c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ;
606 c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ;
607 c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ;
608 c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ;
609 c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ;
610 c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ;
612 * Minimum indexing node size is amended later when superblock is
613 * read and the key length is known.
615 c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ;
617 * Maximum indexing node size is amended later when superblock is
618 * read and the fanout is known.
620 c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX;
623 * Initialize dead and dark LEB space watermarks. See gc.c for comments
624 * about these values.
626 c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
627 c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
630 * Calculate how many bytes would be wasted at the end of LEB if it was
631 * fully filled with data nodes of maximum size. This is used in
632 * calculations when reporting free space.
634 c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
636 /* Buffer size for bulk-reads */
637 c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
638 if (c->max_bu_buf_len > c->leb_size)
639 c->max_bu_buf_len = c->leb_size;
641 /* Log is ready, preserve one LEB for commits. */
642 c->min_log_bytes = c->leb_size;
648 * bud_wbuf_callback - bud LEB write-buffer synchronization call-back.
649 * @c: UBIFS file-system description object
650 * @lnum: LEB the write-buffer was synchronized to
651 * @free: how many free bytes left in this LEB
652 * @pad: how many bytes were padded
654 * This is a callback function which is called by the I/O unit when the
655 * write-buffer is synchronized. We need this to correctly maintain space
656 * accounting in bud logical eraseblocks. This function returns zero in case of
657 * success and a negative error code in case of failure.
659 * This function actually belongs to the journal, but we keep it here because
660 * we want to keep it static.
662 static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
664 return ubifs_update_one_lp(c, lnum, free, pad, 0, 0);
668 * init_constants_sb - initialize UBIFS constants.
669 * @c: UBIFS file-system description object
671 * This is a helper function which initializes various UBIFS constants after
672 * the superblock has been read. It also checks various UBIFS parameters and
673 * makes sure they are all right. Returns zero in case of success and a
674 * negative error code in case of failure.
676 static int init_constants_sb(struct ubifs_info *c)
681 c->main_bytes = (long long)c->main_lebs * c->leb_size;
682 c->max_znode_sz = sizeof(struct ubifs_znode) +
683 c->fanout * sizeof(struct ubifs_zbranch);
685 tmp = ubifs_idx_node_sz(c, 1);
686 c->ranges[UBIFS_IDX_NODE].min_len = tmp;
687 c->min_idx_node_sz = ALIGN(tmp, 8);
689 tmp = ubifs_idx_node_sz(c, c->fanout);
690 c->ranges[UBIFS_IDX_NODE].max_len = tmp;
691 c->max_idx_node_sz = ALIGN(tmp, 8);
693 /* Make sure LEB size is large enough to fit full commit */
694 tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt;
695 tmp = ALIGN(tmp, c->min_io_size);
696 if (tmp > c->leb_size) {
697 ubifs_err(c, "too small LEB size %d, at least %d needed",
703 * Make sure that the log is large enough to fit reference nodes for
704 * all buds plus one reserved LEB.
706 tmp64 = c->max_bud_bytes + c->leb_size - 1;
707 c->max_bud_cnt = div_u64(tmp64, c->leb_size);
708 tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
711 if (c->log_lebs < tmp) {
712 ubifs_err(c, "too small log %d LEBs, required min. %d LEBs",
718 * When budgeting we assume worst-case scenarios when the pages are not
719 * be compressed and direntries are of the maximum size.
721 * Note, data, which may be stored in inodes is budgeted separately, so
722 * it is not included into 'c->bi.inode_budget'.
724 c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE;
725 c->bi.inode_budget = UBIFS_INO_NODE_SZ;
726 c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ;
729 * When the amount of flash space used by buds becomes
730 * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit.
731 * The writers are unblocked when the commit is finished. To avoid
732 * writers to be blocked UBIFS initiates background commit in advance,
733 * when number of bud bytes becomes above the limit defined below.
735 c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4;
738 * Ensure minimum journal size. All the bytes in the journal heads are
739 * considered to be used, when calculating the current journal usage.
740 * Consequently, if the journal is too small, UBIFS will treat it as
743 tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
744 if (c->bg_bud_bytes < tmp64)
745 c->bg_bud_bytes = tmp64;
746 if (c->max_bud_bytes < tmp64 + c->leb_size)
747 c->max_bud_bytes = tmp64 + c->leb_size;
749 err = ubifs_calc_lpt_geom(c);
753 /* Initialize effective LEB size used in budgeting calculations */
754 c->idx_leb_size = c->leb_size - c->max_idx_node_sz;
759 * init_constants_master - initialize UBIFS constants.
760 * @c: UBIFS file-system description object
762 * This is a helper function which initializes various UBIFS constants after
763 * the master node has been read. It also checks various UBIFS parameters and
764 * makes sure they are all right.
766 static void init_constants_master(struct ubifs_info *c)
770 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
771 c->report_rp_size = ubifs_reported_space(c, c->rp_size);
774 * Calculate total amount of FS blocks. This number is not used
775 * internally because it does not make much sense for UBIFS, but it is
776 * necessary to report something for the 'statfs()' call.
778 * Subtract the LEB reserved for GC, the LEB which is reserved for
779 * deletions, minimum LEBs for the index, and assume only one journal
782 tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
783 tmp64 *= (long long)c->leb_size - c->leb_overhead;
784 tmp64 = ubifs_reported_space(c, tmp64);
785 c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
789 * take_gc_lnum - reserve GC LEB.
790 * @c: UBIFS file-system description object
792 * This function ensures that the LEB reserved for garbage collection is marked
793 * as "taken" in lprops. We also have to set free space to LEB size and dirty
794 * space to zero, because lprops may contain out-of-date information if the
795 * file-system was un-mounted before it has been committed. This function
796 * returns zero in case of success and a negative error code in case of
799 static int take_gc_lnum(struct ubifs_info *c)
803 if (c->gc_lnum == -1) {
804 ubifs_err(c, "no LEB for GC");
808 /* And we have to tell lprops that this LEB is taken */
809 err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0,
815 * alloc_wbufs - allocate write-buffers.
816 * @c: UBIFS file-system description object
818 * This helper function allocates and initializes UBIFS write-buffers. Returns
819 * zero in case of success and %-ENOMEM in case of failure.
821 static int alloc_wbufs(struct ubifs_info *c)
825 c->jheads = kcalloc(c->jhead_cnt, sizeof(struct ubifs_jhead),
830 /* Initialize journal heads */
831 for (i = 0; i < c->jhead_cnt; i++) {
832 INIT_LIST_HEAD(&c->jheads[i].buds_list);
833 err = ubifs_wbuf_init(c, &c->jheads[i].wbuf);
837 c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback;
838 c->jheads[i].wbuf.jhead = i;
839 c->jheads[i].grouped = 1;
840 c->jheads[i].log_hash = ubifs_hash_get_desc(c);
841 if (IS_ERR(c->jheads[i].log_hash))
846 * Garbage Collector head does not need to be synchronized by timer.
847 * Also GC head nodes are not grouped.
849 c->jheads[GCHD].wbuf.no_timer = 1;
850 c->jheads[GCHD].grouped = 0;
856 kfree(c->jheads[i].log_hash);
862 * free_wbufs - free write-buffers.
863 * @c: UBIFS file-system description object
865 static void free_wbufs(struct ubifs_info *c)
870 for (i = 0; i < c->jhead_cnt; i++) {
871 kfree(c->jheads[i].wbuf.buf);
872 kfree(c->jheads[i].wbuf.inodes);
873 kfree(c->jheads[i].log_hash);
881 * free_orphans - free orphans.
882 * @c: UBIFS file-system description object
884 static void free_orphans(struct ubifs_info *c)
886 struct ubifs_orphan *orph;
888 while (c->orph_dnext) {
889 orph = c->orph_dnext;
890 c->orph_dnext = orph->dnext;
891 list_del(&orph->list);
895 while (!list_empty(&c->orph_list)) {
896 orph = list_entry(c->orph_list.next, struct ubifs_orphan, list);
897 list_del(&orph->list);
899 ubifs_err(c, "orphan list not empty at unmount");
907 * free_buds - free per-bud objects.
908 * @c: UBIFS file-system description object
910 static void free_buds(struct ubifs_info *c)
912 struct ubifs_bud *bud, *n;
914 rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb)
919 * check_volume_empty - check if the UBI volume is empty.
920 * @c: UBIFS file-system description object
922 * This function checks if the UBIFS volume is empty by looking if its LEBs are
923 * mapped or not. The result of checking is stored in the @c->empty variable.
924 * Returns zero in case of success and a negative error code in case of
927 static int check_volume_empty(struct ubifs_info *c)
932 for (lnum = 0; lnum < c->leb_cnt; lnum++) {
933 err = ubifs_is_mapped(c, lnum);
934 if (unlikely(err < 0))
948 * UBIFS mount options.
950 * Opt_fast_unmount: do not run a journal commit before un-mounting
951 * Opt_norm_unmount: run a journal commit before un-mounting
952 * Opt_bulk_read: enable bulk-reads
953 * Opt_no_bulk_read: disable bulk-reads
954 * Opt_chk_data_crc: check CRCs when reading data nodes
955 * Opt_no_chk_data_crc: do not check CRCs when reading data nodes
956 * Opt_override_compr: override default compressor
957 * Opt_assert: set ubifs_assert() action
958 * Opt_auth_key: The key name used for authentication
959 * Opt_auth_hash_name: The hash type used for authentication
960 * Opt_err: just end of array marker
977 static const match_table_t tokens = {
978 {Opt_fast_unmount, "fast_unmount"},
979 {Opt_norm_unmount, "norm_unmount"},
980 {Opt_bulk_read, "bulk_read"},
981 {Opt_no_bulk_read, "no_bulk_read"},
982 {Opt_chk_data_crc, "chk_data_crc"},
983 {Opt_no_chk_data_crc, "no_chk_data_crc"},
984 {Opt_override_compr, "compr=%s"},
985 {Opt_auth_key, "auth_key=%s"},
986 {Opt_auth_hash_name, "auth_hash_name=%s"},
987 {Opt_ignore, "ubi=%s"},
988 {Opt_ignore, "vol=%s"},
989 {Opt_assert, "assert=%s"},
994 * parse_standard_option - parse a standard mount option.
995 * @option: the option to parse
997 * Normally, standard mount options like "sync" are passed to file-systems as
998 * flags. However, when a "rootflags=" kernel boot parameter is used, they may
999 * be present in the options string. This function tries to deal with this
1000 * situation and parse standard options. Returns 0 if the option was not
1001 * recognized, and the corresponding integer flag if it was.
1003 * UBIFS is only interested in the "sync" option, so do not check for anything
1006 static int parse_standard_option(const char *option)
1009 pr_notice("UBIFS: parse %s\n", option);
1010 if (!strcmp(option, "sync"))
1011 return SB_SYNCHRONOUS;
1016 * ubifs_parse_options - parse mount parameters.
1017 * @c: UBIFS file-system description object
1018 * @options: parameters to parse
1019 * @is_remount: non-zero if this is FS re-mount
1021 * This function parses UBIFS mount options and returns zero in case success
1022 * and a negative error code in case of failure.
1024 static int ubifs_parse_options(struct ubifs_info *c, char *options,
1028 substring_t args[MAX_OPT_ARGS];
1033 while ((p = strsep(&options, ","))) {
1039 token = match_token(p, tokens, args);
1042 * %Opt_fast_unmount and %Opt_norm_unmount options are ignored.
1043 * We accept them in order to be backward-compatible. But this
1044 * should be removed at some point.
1046 case Opt_fast_unmount:
1047 c->mount_opts.unmount_mode = 2;
1049 case Opt_norm_unmount:
1050 c->mount_opts.unmount_mode = 1;
1053 c->mount_opts.bulk_read = 2;
1056 case Opt_no_bulk_read:
1057 c->mount_opts.bulk_read = 1;
1060 case Opt_chk_data_crc:
1061 c->mount_opts.chk_data_crc = 2;
1062 c->no_chk_data_crc = 0;
1064 case Opt_no_chk_data_crc:
1065 c->mount_opts.chk_data_crc = 1;
1066 c->no_chk_data_crc = 1;
1068 case Opt_override_compr:
1070 char *name = match_strdup(&args[0]);
1074 if (!strcmp(name, "none"))
1075 c->mount_opts.compr_type = UBIFS_COMPR_NONE;
1076 else if (!strcmp(name, "lzo"))
1077 c->mount_opts.compr_type = UBIFS_COMPR_LZO;
1078 else if (!strcmp(name, "zlib"))
1079 c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
1080 else if (!strcmp(name, "zstd"))
1081 c->mount_opts.compr_type = UBIFS_COMPR_ZSTD;
1083 ubifs_err(c, "unknown compressor \"%s\"", name); //FIXME: is c ready?
1088 c->mount_opts.override_compr = 1;
1089 c->default_compr = c->mount_opts.compr_type;
1094 char *act = match_strdup(&args[0]);
1098 if (!strcmp(act, "report"))
1099 c->assert_action = ASSACT_REPORT;
1100 else if (!strcmp(act, "read-only"))
1101 c->assert_action = ASSACT_RO;
1102 else if (!strcmp(act, "panic"))
1103 c->assert_action = ASSACT_PANIC;
1105 ubifs_err(c, "unknown assert action \"%s\"", act);
1113 c->auth_key_name = kstrdup(args[0].from, GFP_KERNEL);
1114 if (!c->auth_key_name)
1117 case Opt_auth_hash_name:
1118 c->auth_hash_name = kstrdup(args[0].from, GFP_KERNEL);
1119 if (!c->auth_hash_name)
1127 struct super_block *sb = c->vfs_sb;
1129 flag = parse_standard_option(p);
1131 ubifs_err(c, "unrecognized mount option \"%s\" or missing value",
1135 sb->s_flags |= flag;
1145 * destroy_journal - destroy journal data structures.
1146 * @c: UBIFS file-system description object
1148 * This function destroys journal data structures including those that may have
1149 * been created by recovery functions.
1151 static void destroy_journal(struct ubifs_info *c)
1153 while (!list_empty(&c->unclean_leb_list)) {
1154 struct ubifs_unclean_leb *ucleb;
1156 ucleb = list_entry(c->unclean_leb_list.next,
1157 struct ubifs_unclean_leb, list);
1158 list_del(&ucleb->list);
1161 while (!list_empty(&c->old_buds)) {
1162 struct ubifs_bud *bud;
1164 bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
1165 list_del(&bud->list);
1168 ubifs_destroy_idx_gc(c);
1169 ubifs_destroy_size_tree(c);
1175 * bu_init - initialize bulk-read information.
1176 * @c: UBIFS file-system description object
1178 static void bu_init(struct ubifs_info *c)
1180 ubifs_assert(c, c->bulk_read == 1);
1183 return; /* Already initialized */
1186 c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
1188 if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
1189 c->max_bu_buf_len = UBIFS_KMALLOC_OK;
1193 /* Just disable bulk-read */
1194 ubifs_warn(c, "cannot allocate %d bytes of memory for bulk-read, disabling it",
1196 c->mount_opts.bulk_read = 1;
1203 * check_free_space - check if there is enough free space to mount.
1204 * @c: UBIFS file-system description object
1206 * This function makes sure UBIFS has enough free space to be mounted in
1207 * read/write mode. UBIFS must always have some free space to allow deletions.
1209 static int check_free_space(struct ubifs_info *c)
1211 ubifs_assert(c, c->dark_wm > 0);
1212 if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {
1213 ubifs_err(c, "insufficient free space to mount in R/W mode");
1214 ubifs_dump_budg(c, &c->bi);
1215 ubifs_dump_lprops(c);
1222 * mount_ubifs - mount UBIFS file-system.
1223 * @c: UBIFS file-system description object
1225 * This function mounts UBIFS file system. Returns zero in case of success and
1226 * a negative error code in case of failure.
1228 static int mount_ubifs(struct ubifs_info *c)
1234 c->ro_mount = !!sb_rdonly(c->vfs_sb);
1235 /* Suppress error messages while probing if SB_SILENT is set */
1236 c->probing = !!(c->vfs_sb->s_flags & SB_SILENT);
1238 err = init_constants_early(c);
1242 err = ubifs_debugging_init(c);
1246 err = check_volume_empty(c);
1250 if (c->empty && (c->ro_mount || c->ro_media)) {
1252 * This UBI volume is empty, and read-only, or the file system
1253 * is mounted read-only - we cannot format it.
1255 ubifs_err(c, "can't format empty UBI volume: read-only %s",
1256 c->ro_media ? "UBI volume" : "mount");
1261 if (c->ro_media && !c->ro_mount) {
1262 ubifs_err(c, "cannot mount read-write - read-only media");
1268 * The requirement for the buffer is that it should fit indexing B-tree
1269 * height amount of integers. We assume the height if the TNC tree will
1273 c->bottom_up_buf = kmalloc_array(BOTTOM_UP_HEIGHT, sizeof(int),
1275 if (!c->bottom_up_buf)
1278 c->sbuf = vmalloc(c->leb_size);
1283 c->ileb_buf = vmalloc(c->leb_size);
1288 if (c->bulk_read == 1)
1292 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \
1293 UBIFS_CIPHER_BLOCK_SIZE,
1295 if (!c->write_reserve_buf)
1301 if (c->auth_key_name) {
1302 if (IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) {
1303 err = ubifs_init_authentication(c);
1307 ubifs_err(c, "auth_key_name, but UBIFS is built without"
1308 " authentication support");
1314 err = ubifs_read_superblock(c);
1321 * Make sure the compressor which is set as default in the superblock
1322 * or overridden by mount options is actually compiled in.
1324 if (!ubifs_compr_present(c, c->default_compr)) {
1325 ubifs_err(c, "'compressor \"%s\" is not compiled in",
1326 ubifs_compr_name(c, c->default_compr));
1331 err = init_constants_sb(c);
1335 sz = ALIGN(c->max_idx_node_sz, c->min_io_size) * 2;
1336 c->cbuf = kmalloc(sz, GFP_NOFS);
1342 err = alloc_wbufs(c);
1346 sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
1348 /* Create background thread */
1349 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1350 if (IS_ERR(c->bgt)) {
1351 err = PTR_ERR(c->bgt);
1353 ubifs_err(c, "cannot spawn \"%s\", error %d",
1357 wake_up_process(c->bgt);
1360 err = ubifs_read_master(c);
1364 init_constants_master(c);
1366 if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
1367 ubifs_msg(c, "recovery needed");
1368 c->need_recovery = 1;
1371 if (c->need_recovery && !c->ro_mount) {
1372 err = ubifs_recover_inl_heads(c, c->sbuf);
1377 err = ubifs_lpt_init(c, 1, !c->ro_mount);
1381 if (!c->ro_mount && c->space_fixup) {
1382 err = ubifs_fixup_free_space(c);
1387 if (!c->ro_mount && !c->need_recovery) {
1389 * Set the "dirty" flag so that if we reboot uncleanly we
1390 * will notice this immediately on the next mount.
1392 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1393 err = ubifs_write_master(c);
1399 * Handle offline signed images: Now that the master node is
1400 * written and its validation no longer depends on the hash
1401 * in the superblock, we can update the offline signed
1402 * superblock with a HMAC version,
1404 if (ubifs_authenticated(c) && ubifs_hmac_zero(c, c->sup_node->hmac)) {
1405 err = ubifs_hmac_wkm(c, c->sup_node->hmac_wkm);
1408 c->superblock_need_write = 1;
1411 if (!c->ro_mount && c->superblock_need_write) {
1412 err = ubifs_write_sb_node(c, c->sup_node);
1415 c->superblock_need_write = 0;
1418 err = dbg_check_idx_size(c, c->bi.old_idx_sz);
1422 err = ubifs_replay_journal(c);
1426 /* Calculate 'min_idx_lebs' after journal replay */
1427 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
1429 err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount);
1436 err = check_free_space(c);
1440 /* Check for enough log space */
1441 lnum = c->lhead_lnum + 1;
1442 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1443 lnum = UBIFS_LOG_LNUM;
1444 if (lnum == c->ltail_lnum) {
1445 err = ubifs_consolidate_log(c);
1450 if (c->need_recovery) {
1451 if (!ubifs_authenticated(c)) {
1452 err = ubifs_recover_size(c, true);
1457 err = ubifs_rcvry_gc_commit(c);
1461 if (ubifs_authenticated(c)) {
1462 err = ubifs_recover_size(c, false);
1467 err = take_gc_lnum(c);
1472 * GC LEB may contain garbage if there was an unclean
1473 * reboot, and it should be un-mapped.
1475 err = ubifs_leb_unmap(c, c->gc_lnum);
1480 err = dbg_check_lprops(c);
1483 } else if (c->need_recovery) {
1484 err = ubifs_recover_size(c, false);
1489 * Even if we mount read-only, we have to set space in GC LEB
1490 * to proper value because this affects UBIFS free space
1491 * reporting. We do not want to have a situation when
1492 * re-mounting from R/O to R/W changes amount of free space.
1494 err = take_gc_lnum(c);
1499 spin_lock(&ubifs_infos_lock);
1500 list_add_tail(&c->infos_list, &ubifs_infos);
1501 spin_unlock(&ubifs_infos_lock);
1503 if (c->need_recovery) {
1505 ubifs_msg(c, "recovery deferred");
1507 c->need_recovery = 0;
1508 ubifs_msg(c, "recovery completed");
1510 * GC LEB has to be empty and taken at this point. But
1511 * the journal head LEBs may also be accounted as
1512 * "empty taken" if they are empty.
1514 ubifs_assert(c, c->lst.taken_empty_lebs > 0);
1517 ubifs_assert(c, c->lst.taken_empty_lebs > 0);
1519 err = dbg_check_filesystem(c);
1523 dbg_debugfs_init_fs(c);
1527 ubifs_msg(c, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s",
1528 c->vi.ubi_num, c->vi.vol_id, c->vi.name,
1529 c->ro_mount ? ", R/O mode" : "");
1530 x = (long long)c->main_lebs * c->leb_size;
1531 y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
1532 ubifs_msg(c, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
1533 c->leb_size, c->leb_size >> 10, c->min_io_size,
1535 ubifs_msg(c, "FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)",
1536 x, x >> 20, c->main_lebs,
1537 y, y >> 20, c->log_lebs + c->max_bud_cnt);
1538 ubifs_msg(c, "reserved for root: %llu bytes (%llu KiB)",
1539 c->report_rp_size, c->report_rp_size >> 10);
1540 ubifs_msg(c, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
1541 c->fmt_version, c->ro_compat_version,
1542 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid,
1543 c->big_lpt ? ", big LPT model" : ", small LPT model");
1545 dbg_gen("default compressor: %s", ubifs_compr_name(c, c->default_compr));
1546 dbg_gen("data journal heads: %d",
1547 c->jhead_cnt - NONDATA_JHEADS_CNT);
1548 dbg_gen("log LEBs: %d (%d - %d)",
1549 c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
1550 dbg_gen("LPT area LEBs: %d (%d - %d)",
1551 c->lpt_lebs, c->lpt_first, c->lpt_last);
1552 dbg_gen("orphan area LEBs: %d (%d - %d)",
1553 c->orph_lebs, c->orph_first, c->orph_last);
1554 dbg_gen("main area LEBs: %d (%d - %d)",
1555 c->main_lebs, c->main_first, c->leb_cnt - 1);
1556 dbg_gen("index LEBs: %d", c->lst.idx_lebs);
1557 dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)",
1558 c->bi.old_idx_sz, c->bi.old_idx_sz >> 10,
1559 c->bi.old_idx_sz >> 20);
1560 dbg_gen("key hash type: %d", c->key_hash_type);
1561 dbg_gen("tree fanout: %d", c->fanout);
1562 dbg_gen("reserved GC LEB: %d", c->gc_lnum);
1563 dbg_gen("max. znode size %d", c->max_znode_sz);
1564 dbg_gen("max. index node size %d", c->max_idx_node_sz);
1565 dbg_gen("node sizes: data %zu, inode %zu, dentry %zu",
1566 UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
1567 dbg_gen("node sizes: trun %zu, sb %zu, master %zu",
1568 UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
1569 dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu",
1570 UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
1571 dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
1572 UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
1573 UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout));
1574 dbg_gen("dead watermark: %d", c->dead_wm);
1575 dbg_gen("dark watermark: %d", c->dark_wm);
1576 dbg_gen("LEB overhead: %d", c->leb_overhead);
1577 x = (long long)c->main_lebs * c->dark_wm;
1578 dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)",
1579 x, x >> 10, x >> 20);
1580 dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
1581 c->max_bud_bytes, c->max_bud_bytes >> 10,
1582 c->max_bud_bytes >> 20);
1583 dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
1584 c->bg_bud_bytes, c->bg_bud_bytes >> 10,
1585 c->bg_bud_bytes >> 20);
1586 dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)",
1587 c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
1588 dbg_gen("max. seq. number: %llu", c->max_sqnum);
1589 dbg_gen("commit number: %llu", c->cmt_no);
1590 dbg_gen("max. xattrs per inode: %d", ubifs_xattr_max_cnt(c));
1591 dbg_gen("max orphans: %d", c->max_orphans);
1596 spin_lock(&ubifs_infos_lock);
1597 list_del(&c->infos_list);
1598 spin_unlock(&ubifs_infos_lock);
1604 ubifs_lpt_free(c, 0);
1607 kfree(c->rcvrd_mst_node);
1609 kthread_stop(c->bgt);
1615 kfree(c->write_reserve_buf);
1619 kfree(c->bottom_up_buf);
1621 ubifs_debugging_exit(c);
1626 * ubifs_umount - un-mount UBIFS file-system.
1627 * @c: UBIFS file-system description object
1629 * Note, this function is called to free allocated resourced when un-mounting,
1630 * as well as free resources when an error occurred while we were half way
1631 * through mounting (error path cleanup function). So it has to make sure the
1632 * resource was actually allocated before freeing it.
1634 static void ubifs_umount(struct ubifs_info *c)
1636 dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
1639 dbg_debugfs_exit_fs(c);
1640 spin_lock(&ubifs_infos_lock);
1641 list_del(&c->infos_list);
1642 spin_unlock(&ubifs_infos_lock);
1645 kthread_stop(c->bgt);
1650 ubifs_lpt_free(c, 0);
1651 ubifs_exit_authentication(c);
1653 kfree(c->auth_key_name);
1654 kfree(c->auth_hash_name);
1656 kfree(c->rcvrd_mst_node);
1658 kfree(c->write_reserve_buf);
1662 kfree(c->bottom_up_buf);
1664 ubifs_debugging_exit(c);
1668 * ubifs_remount_rw - re-mount in read-write mode.
1669 * @c: UBIFS file-system description object
1671 * UBIFS avoids allocating many unnecessary resources when mounted in read-only
1672 * mode. This function allocates the needed resources and re-mounts UBIFS in
1675 static int ubifs_remount_rw(struct ubifs_info *c)
1679 if (c->rw_incompat) {
1680 ubifs_err(c, "the file-system is not R/W-compatible");
1681 ubifs_msg(c, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
1682 c->fmt_version, c->ro_compat_version,
1683 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
1687 mutex_lock(&c->umount_mutex);
1688 dbg_save_space_info(c);
1689 c->remounting_rw = 1;
1692 if (c->space_fixup) {
1693 err = ubifs_fixup_free_space(c);
1698 err = check_free_space(c);
1702 if (c->need_recovery) {
1703 ubifs_msg(c, "completing deferred recovery");
1704 err = ubifs_write_rcvrd_mst_node(c);
1707 if (!ubifs_authenticated(c)) {
1708 err = ubifs_recover_size(c, true);
1712 err = ubifs_clean_lebs(c, c->sbuf);
1715 err = ubifs_recover_inl_heads(c, c->sbuf);
1719 /* A readonly mount is not allowed to have orphans */
1720 ubifs_assert(c, c->tot_orphans == 0);
1721 err = ubifs_clear_orphans(c);
1726 if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) {
1727 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1728 err = ubifs_write_master(c);
1733 if (c->superblock_need_write) {
1734 struct ubifs_sb_node *sup = c->sup_node;
1736 err = ubifs_write_sb_node(c, sup);
1740 c->superblock_need_write = 0;
1743 c->ileb_buf = vmalloc(c->leb_size);
1749 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \
1750 UBIFS_CIPHER_BLOCK_SIZE, GFP_KERNEL);
1751 if (!c->write_reserve_buf) {
1756 err = ubifs_lpt_init(c, 0, 1);
1760 /* Create background thread */
1761 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1762 if (IS_ERR(c->bgt)) {
1763 err = PTR_ERR(c->bgt);
1765 ubifs_err(c, "cannot spawn \"%s\", error %d",
1769 wake_up_process(c->bgt);
1771 c->orph_buf = vmalloc(c->leb_size);
1777 /* Check for enough log space */
1778 lnum = c->lhead_lnum + 1;
1779 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1780 lnum = UBIFS_LOG_LNUM;
1781 if (lnum == c->ltail_lnum) {
1782 err = ubifs_consolidate_log(c);
1787 if (c->need_recovery) {
1788 err = ubifs_rcvry_gc_commit(c);
1792 if (ubifs_authenticated(c)) {
1793 err = ubifs_recover_size(c, false);
1798 err = ubifs_leb_unmap(c, c->gc_lnum);
1803 dbg_gen("re-mounted read-write");
1804 c->remounting_rw = 0;
1806 if (c->need_recovery) {
1807 c->need_recovery = 0;
1808 ubifs_msg(c, "deferred recovery completed");
1811 * Do not run the debugging space check if the were doing
1812 * recovery, because when we saved the information we had the
1813 * file-system in a state where the TNC and lprops has been
1814 * modified in memory, but all the I/O operations (including a
1815 * commit) were deferred. So the file-system was in
1816 * "non-committed" state. Now the file-system is in committed
1817 * state, and of course the amount of free space will change
1818 * because, for example, the old index size was imprecise.
1820 err = dbg_check_space_info(c);
1823 mutex_unlock(&c->umount_mutex);
1831 kthread_stop(c->bgt);
1835 kfree(c->write_reserve_buf);
1836 c->write_reserve_buf = NULL;
1839 ubifs_lpt_free(c, 1);
1840 c->remounting_rw = 0;
1841 mutex_unlock(&c->umount_mutex);
1846 * ubifs_remount_ro - re-mount in read-only mode.
1847 * @c: UBIFS file-system description object
1849 * We assume VFS has stopped writing. Possibly the background thread could be
1850 * running a commit, however kthread_stop will wait in that case.
1852 static void ubifs_remount_ro(struct ubifs_info *c)
1856 ubifs_assert(c, !c->need_recovery);
1857 ubifs_assert(c, !c->ro_mount);
1859 mutex_lock(&c->umount_mutex);
1861 kthread_stop(c->bgt);
1865 dbg_save_space_info(c);
1867 for (i = 0; i < c->jhead_cnt; i++) {
1868 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
1870 ubifs_ro_mode(c, err);
1873 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1874 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1875 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1876 err = ubifs_write_master(c);
1878 ubifs_ro_mode(c, err);
1882 kfree(c->write_reserve_buf);
1883 c->write_reserve_buf = NULL;
1886 ubifs_lpt_free(c, 1);
1888 err = dbg_check_space_info(c);
1890 ubifs_ro_mode(c, err);
1891 mutex_unlock(&c->umount_mutex);
1894 static void ubifs_put_super(struct super_block *sb)
1897 struct ubifs_info *c = sb->s_fs_info;
1899 ubifs_msg(c, "un-mount UBI device %d", c->vi.ubi_num);
1902 * The following asserts are only valid if there has not been a failure
1903 * of the media. For example, there will be dirty inodes if we failed
1904 * to write them back because of I/O errors.
1907 ubifs_assert(c, c->bi.idx_growth == 0);
1908 ubifs_assert(c, c->bi.dd_growth == 0);
1909 ubifs_assert(c, c->bi.data_growth == 0);
1913 * The 'c->umount_lock' prevents races between UBIFS memory shrinker
1914 * and file system un-mount. Namely, it prevents the shrinker from
1915 * picking this superblock for shrinking - it will be just skipped if
1916 * the mutex is locked.
1918 mutex_lock(&c->umount_mutex);
1921 * First of all kill the background thread to make sure it does
1922 * not interfere with un-mounting and freeing resources.
1925 kthread_stop(c->bgt);
1930 * On fatal errors c->ro_error is set to 1, in which case we do
1931 * not write the master node.
1936 /* Synchronize write-buffers */
1937 for (i = 0; i < c->jhead_cnt; i++) {
1938 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
1940 ubifs_ro_mode(c, err);
1944 * We are being cleanly unmounted which means the
1945 * orphans were killed - indicate this in the master
1946 * node. Also save the reserved GC LEB number.
1948 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1949 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1950 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1951 err = ubifs_write_master(c);
1954 * Recovery will attempt to fix the master area
1955 * next mount, so we just print a message and
1956 * continue to unmount normally.
1958 ubifs_err(c, "failed to write master node, error %d",
1961 for (i = 0; i < c->jhead_cnt; i++)
1962 /* Make sure write-buffer timers are canceled */
1963 hrtimer_cancel(&c->jheads[i].wbuf.timer);
1968 ubi_close_volume(c->ubi);
1969 mutex_unlock(&c->umount_mutex);
1972 static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
1975 struct ubifs_info *c = sb->s_fs_info;
1977 sync_filesystem(sb);
1978 dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags);
1980 err = ubifs_parse_options(c, data, 1);
1982 ubifs_err(c, "invalid or unknown remount parameter");
1986 if (c->ro_mount && !(*flags & SB_RDONLY)) {
1988 ubifs_msg(c, "cannot re-mount R/W due to prior errors");
1992 ubifs_msg(c, "cannot re-mount R/W - UBI volume is R/O");
1995 err = ubifs_remount_rw(c);
1998 } else if (!c->ro_mount && (*flags & SB_RDONLY)) {
2000 ubifs_msg(c, "cannot re-mount R/O due to prior errors");
2003 ubifs_remount_ro(c);
2006 if (c->bulk_read == 1)
2009 dbg_gen("disable bulk-read");
2010 mutex_lock(&c->bu_mutex);
2013 mutex_unlock(&c->bu_mutex);
2016 if (!c->need_recovery)
2017 ubifs_assert(c, c->lst.taken_empty_lebs > 0);
2022 const struct super_operations ubifs_super_operations = {
2023 .alloc_inode = ubifs_alloc_inode,
2024 .free_inode = ubifs_free_inode,
2025 .put_super = ubifs_put_super,
2026 .write_inode = ubifs_write_inode,
2027 .drop_inode = ubifs_drop_inode,
2028 .evict_inode = ubifs_evict_inode,
2029 .statfs = ubifs_statfs,
2030 .dirty_inode = ubifs_dirty_inode,
2031 .remount_fs = ubifs_remount_fs,
2032 .show_options = ubifs_show_options,
2033 .sync_fs = ubifs_sync_fs,
2037 * open_ubi - parse UBI device name string and open the UBI device.
2038 * @name: UBI volume name
2039 * @mode: UBI volume open mode
2041 * The primary method of mounting UBIFS is by specifying the UBI volume
2042 * character device node path. However, UBIFS may also be mounted withoug any
2043 * character device node using one of the following methods:
2045 * o ubiX_Y - mount UBI device number X, volume Y;
2046 * o ubiY - mount UBI device number 0, volume Y;
2047 * o ubiX:NAME - mount UBI device X, volume with name NAME;
2048 * o ubi:NAME - mount UBI device 0, volume with name NAME.
2050 * Alternative '!' separator may be used instead of ':' (because some shells
2051 * like busybox may interpret ':' as an NFS host name separator). This function
2052 * returns UBI volume description object in case of success and a negative
2053 * error code in case of failure.
2055 static struct ubi_volume_desc *open_ubi(const char *name, int mode)
2057 struct ubi_volume_desc *ubi;
2061 if (!name || !*name)
2062 return ERR_PTR(-EINVAL);
2064 /* First, try to open using the device node path method */
2065 ubi = ubi_open_volume_path(name, mode);
2069 /* Try the "nodev" method */
2070 if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
2071 return ERR_PTR(-EINVAL);
2073 /* ubi:NAME method */
2074 if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
2075 return ubi_open_volume_nm(0, name + 4, mode);
2077 if (!isdigit(name[3]))
2078 return ERR_PTR(-EINVAL);
2080 dev = simple_strtoul(name + 3, &endptr, 0);
2083 if (*endptr == '\0')
2084 return ubi_open_volume(0, dev, mode);
2087 if (*endptr == '_' && isdigit(endptr[1])) {
2088 vol = simple_strtoul(endptr + 1, &endptr, 0);
2089 if (*endptr != '\0')
2090 return ERR_PTR(-EINVAL);
2091 return ubi_open_volume(dev, vol, mode);
2094 /* ubiX:NAME method */
2095 if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
2096 return ubi_open_volume_nm(dev, ++endptr, mode);
2098 return ERR_PTR(-EINVAL);
2101 static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
2103 struct ubifs_info *c;
2105 c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
2107 spin_lock_init(&c->cnt_lock);
2108 spin_lock_init(&c->cs_lock);
2109 spin_lock_init(&c->buds_lock);
2110 spin_lock_init(&c->space_lock);
2111 spin_lock_init(&c->orphan_lock);
2112 init_rwsem(&c->commit_sem);
2113 mutex_init(&c->lp_mutex);
2114 mutex_init(&c->tnc_mutex);
2115 mutex_init(&c->log_mutex);
2116 mutex_init(&c->umount_mutex);
2117 mutex_init(&c->bu_mutex);
2118 mutex_init(&c->write_reserve_mutex);
2119 init_waitqueue_head(&c->cmt_wq);
2121 c->old_idx = RB_ROOT;
2122 c->size_tree = RB_ROOT;
2123 c->orph_tree = RB_ROOT;
2124 INIT_LIST_HEAD(&c->infos_list);
2125 INIT_LIST_HEAD(&c->idx_gc);
2126 INIT_LIST_HEAD(&c->replay_list);
2127 INIT_LIST_HEAD(&c->replay_buds);
2128 INIT_LIST_HEAD(&c->uncat_list);
2129 INIT_LIST_HEAD(&c->empty_list);
2130 INIT_LIST_HEAD(&c->freeable_list);
2131 INIT_LIST_HEAD(&c->frdi_idx_list);
2132 INIT_LIST_HEAD(&c->unclean_leb_list);
2133 INIT_LIST_HEAD(&c->old_buds);
2134 INIT_LIST_HEAD(&c->orph_list);
2135 INIT_LIST_HEAD(&c->orph_new);
2136 c->no_chk_data_crc = 1;
2137 c->assert_action = ASSACT_RO;
2139 c->highest_inum = UBIFS_FIRST_INO;
2140 c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
2142 ubi_get_volume_info(ubi, &c->vi);
2143 ubi_get_device_info(c->vi.ubi_num, &c->di);
2148 static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
2150 struct ubifs_info *c = sb->s_fs_info;
2155 /* Re-open the UBI device in read-write mode */
2156 c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
2157 if (IS_ERR(c->ubi)) {
2158 err = PTR_ERR(c->ubi);
2162 err = ubifs_parse_options(c, data, 0);
2167 * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For
2168 * UBIFS, I/O is not deferred, it is done immediately in readpage,
2169 * which means the user would have to wait not just for their own I/O
2170 * but the read-ahead I/O as well i.e. completely pointless.
2172 * Read-ahead will be disabled because @sb->s_bdi->ra_pages is 0. Also
2173 * @sb->s_bdi->capabilities are initialized to 0 so there won't be any
2174 * writeback happening.
2176 err = super_setup_bdi_name(sb, "ubifs_%d_%d", c->vi.ubi_num,
2182 sb->s_magic = UBIFS_SUPER_MAGIC;
2183 sb->s_blocksize = UBIFS_BLOCK_SIZE;
2184 sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
2185 sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
2186 if (c->max_inode_sz > MAX_LFS_FILESIZE)
2187 sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
2188 sb->s_op = &ubifs_super_operations;
2189 #ifdef CONFIG_UBIFS_FS_XATTR
2190 sb->s_xattr = ubifs_xattr_handlers;
2192 fscrypt_set_ops(sb, &ubifs_crypt_operations);
2194 mutex_lock(&c->umount_mutex);
2195 err = mount_ubifs(c);
2197 ubifs_assert(c, err < 0);
2201 /* Read the root inode */
2202 root = ubifs_iget(sb, UBIFS_ROOT_INO);
2204 err = PTR_ERR(root);
2208 sb->s_root = d_make_root(root);
2214 mutex_unlock(&c->umount_mutex);
2220 mutex_unlock(&c->umount_mutex);
2222 ubi_close_volume(c->ubi);
2227 static int sb_test(struct super_block *sb, void *data)
2229 struct ubifs_info *c1 = data;
2230 struct ubifs_info *c = sb->s_fs_info;
2232 return c->vi.cdev == c1->vi.cdev;
2235 static int sb_set(struct super_block *sb, void *data)
2237 sb->s_fs_info = data;
2238 return set_anon_super(sb, NULL);
2241 static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
2242 const char *name, void *data)
2244 struct ubi_volume_desc *ubi;
2245 struct ubifs_info *c;
2246 struct super_block *sb;
2249 dbg_gen("name %s, flags %#x", name, flags);
2252 * Get UBI device number and volume ID. Mount it read-only so far
2253 * because this might be a new mount point, and UBI allows only one
2254 * read-write user at a time.
2256 ubi = open_ubi(name, UBI_READONLY);
2258 if (!(flags & SB_SILENT))
2259 pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d",
2260 current->pid, name, (int)PTR_ERR(ubi));
2261 return ERR_CAST(ubi);
2264 c = alloc_ubifs_info(ubi);
2270 dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
2272 sb = sget(fs_type, sb_test, sb_set, flags, c);
2280 struct ubifs_info *c1 = sb->s_fs_info;
2282 /* A new mount point for already mounted UBIFS */
2283 dbg_gen("this ubi volume is already mounted");
2284 if (!!(flags & SB_RDONLY) != c1->ro_mount) {
2289 err = ubifs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
2292 /* We do not support atime */
2293 sb->s_flags |= SB_ACTIVE;
2294 if (IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT))
2295 ubifs_msg(c, "full atime support is enabled.");
2297 sb->s_flags |= SB_NOATIME;
2300 /* 'fill_super()' opens ubi again so we must close it here */
2301 ubi_close_volume(ubi);
2303 return dget(sb->s_root);
2306 deactivate_locked_super(sb);
2308 ubi_close_volume(ubi);
2309 return ERR_PTR(err);
2312 static void kill_ubifs_super(struct super_block *s)
2314 struct ubifs_info *c = s->s_fs_info;
2319 static struct file_system_type ubifs_fs_type = {
2321 .owner = THIS_MODULE,
2322 .mount = ubifs_mount,
2323 .kill_sb = kill_ubifs_super,
2325 MODULE_ALIAS_FS("ubifs");
2328 * Inode slab cache constructor.
2330 static void inode_slab_ctor(void *obj)
2332 struct ubifs_inode *ui = obj;
2333 inode_init_once(&ui->vfs_inode);
2336 static int __init ubifs_init(void)
2340 BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
2342 /* Make sure node sizes are 8-byte aligned */
2343 BUILD_BUG_ON(UBIFS_CH_SZ & 7);
2344 BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7);
2345 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
2346 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
2347 BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
2348 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
2349 BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7);
2350 BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7);
2351 BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7);
2352 BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7);
2353 BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
2355 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
2356 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
2357 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
2358 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7);
2359 BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7);
2360 BUILD_BUG_ON(MIN_WRITE_SZ & 7);
2362 /* Check min. node size */
2363 BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ);
2364 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
2365 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
2366 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
2368 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2369 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2370 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
2371 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ);
2373 /* Defined node sizes */
2374 BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096);
2375 BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
2376 BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
2377 BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
2380 * We use 2 bit wide bit-fields to store compression type, which should
2381 * be amended if more compressors are added. The bit-fields are:
2382 * @compr_type in 'struct ubifs_inode', @default_compr in
2383 * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'.
2385 BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
2388 * We require that PAGE_SIZE is greater-than-or-equal-to
2389 * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
2391 if (PAGE_SIZE < UBIFS_BLOCK_SIZE) {
2392 pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes",
2393 current->pid, (unsigned int)PAGE_SIZE);
2397 ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
2398 sizeof(struct ubifs_inode), 0,
2399 SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT |
2400 SLAB_ACCOUNT, &inode_slab_ctor);
2401 if (!ubifs_inode_slab)
2404 err = register_shrinker(&ubifs_shrinker_info);
2408 err = ubifs_compressors_init();
2414 err = register_filesystem(&ubifs_fs_type);
2416 pr_err("UBIFS error (pid %d): cannot register file system, error %d",
2424 ubifs_compressors_exit();
2426 unregister_shrinker(&ubifs_shrinker_info);
2428 kmem_cache_destroy(ubifs_inode_slab);
2431 /* late_initcall to let compressors initialize first */
2432 late_initcall(ubifs_init);
2434 static void __exit ubifs_exit(void)
2436 WARN_ON(!list_empty(&ubifs_infos));
2437 WARN_ON(atomic_long_read(&ubifs_clean_zn_cnt) != 0);
2440 ubifs_compressors_exit();
2441 unregister_shrinker(&ubifs_shrinker_info);
2444 * Make sure all delayed rcu free inodes are flushed before we
2448 kmem_cache_destroy(ubifs_inode_slab);
2449 unregister_filesystem(&ubifs_fs_type);
2451 module_exit(ubifs_exit);
2453 MODULE_LICENSE("GPL");
2454 MODULE_VERSION(__stringify(UBIFS_VERSION));
2455 MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2456 MODULE_DESCRIPTION("UBIFS - UBI File System");