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;
60 * validate_inode - validate inode.
61 * @c: UBIFS file-system description object
62 * @inode: the inode to validate
64 * This is a helper function for 'ubifs_iget()' which validates various fields
65 * of a newly built inode to make sure they contain sane values and prevent
66 * possible vulnerabilities. Returns zero if the inode is all right and
67 * a non-zero error code if not.
69 static int validate_inode(struct ubifs_info *c, const struct inode *inode)
72 const struct ubifs_inode *ui = ubifs_inode(inode);
74 if (inode->i_size > c->max_inode_sz) {
75 ubifs_err(c, "inode is too large (%lld)",
76 (long long)inode->i_size);
80 if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
81 ubifs_err(c, "unknown compression type %d", ui->compr_type);
85 if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX)
88 if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA)
91 if (ui->xattr && !S_ISREG(inode->i_mode))
94 if (!ubifs_compr_present(c, ui->compr_type)) {
95 ubifs_warn(c, "inode %lu uses '%s' compression, but it was not compiled in",
96 inode->i_ino, ubifs_compr_name(c, ui->compr_type));
99 err = dbg_check_dir(c, inode);
103 struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
107 struct ubifs_ino_node *ino;
108 struct ubifs_info *c = sb->s_fs_info;
110 struct ubifs_inode *ui;
112 dbg_gen("inode %lu", inum);
114 inode = iget_locked(sb, inum);
116 return ERR_PTR(-ENOMEM);
117 if (!(inode->i_state & I_NEW))
119 ui = ubifs_inode(inode);
121 ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
127 ino_key_init(c, &key, inode->i_ino);
129 err = ubifs_tnc_lookup(c, &key, ino);
133 inode->i_flags |= S_NOCMTIME;
135 if (!IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT))
136 inode->i_flags |= S_NOATIME;
138 set_nlink(inode, le32_to_cpu(ino->nlink));
139 i_uid_write(inode, le32_to_cpu(ino->uid));
140 i_gid_write(inode, le32_to_cpu(ino->gid));
141 inode_set_atime(inode, (int64_t)le64_to_cpu(ino->atime_sec),
142 le32_to_cpu(ino->atime_nsec));
143 inode_set_mtime(inode, (int64_t)le64_to_cpu(ino->mtime_sec),
144 le32_to_cpu(ino->mtime_nsec));
145 inode_set_ctime(inode, (int64_t)le64_to_cpu(ino->ctime_sec),
146 le32_to_cpu(ino->ctime_nsec));
147 inode->i_mode = le32_to_cpu(ino->mode);
148 inode->i_size = le64_to_cpu(ino->size);
150 ui->data_len = le32_to_cpu(ino->data_len);
151 ui->flags = le32_to_cpu(ino->flags);
152 ui->compr_type = le16_to_cpu(ino->compr_type);
153 ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
154 ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
155 ui->xattr_size = le32_to_cpu(ino->xattr_size);
156 ui->xattr_names = le32_to_cpu(ino->xattr_names);
157 ui->synced_i_size = ui->ui_size = inode->i_size;
159 ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0;
161 err = validate_inode(c, inode);
165 switch (inode->i_mode & S_IFMT) {
167 inode->i_mapping->a_ops = &ubifs_file_address_operations;
168 inode->i_op = &ubifs_file_inode_operations;
169 inode->i_fop = &ubifs_file_operations;
171 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
176 memcpy(ui->data, ino->data, ui->data_len);
177 ((char *)ui->data)[ui->data_len] = '\0';
178 } else if (ui->data_len != 0) {
184 inode->i_op = &ubifs_dir_inode_operations;
185 inode->i_fop = &ubifs_dir_operations;
186 if (ui->data_len != 0) {
192 inode->i_op = &ubifs_symlink_inode_operations;
193 if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
197 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
202 memcpy(ui->data, ino->data, ui->data_len);
203 ((char *)ui->data)[ui->data_len] = '\0';
209 union ubifs_dev_desc *dev;
211 ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
217 dev = (union ubifs_dev_desc *)ino->data;
218 if (ui->data_len == sizeof(dev->new))
219 rdev = new_decode_dev(le32_to_cpu(dev->new));
220 else if (ui->data_len == sizeof(dev->huge))
221 rdev = huge_decode_dev(le64_to_cpu(dev->huge));
226 memcpy(ui->data, ino->data, ui->data_len);
227 inode->i_op = &ubifs_file_inode_operations;
228 init_special_inode(inode, inode->i_mode, rdev);
233 inode->i_op = &ubifs_file_inode_operations;
234 init_special_inode(inode, inode->i_mode, 0);
235 if (ui->data_len != 0) {
246 ubifs_set_inode_flags(inode);
247 unlock_new_inode(inode);
251 ubifs_err(c, "inode %lu validation failed, error %d", inode->i_ino, err);
252 ubifs_dump_node(c, ino, UBIFS_MAX_INO_NODE_SZ);
253 ubifs_dump_inode(c, inode);
258 ubifs_err(c, "failed to read inode %lu, error %d", inode->i_ino, err);
263 static struct inode *ubifs_alloc_inode(struct super_block *sb)
265 struct ubifs_inode *ui;
267 ui = alloc_inode_sb(sb, ubifs_inode_slab, GFP_NOFS);
271 memset((void *)ui + sizeof(struct inode), 0,
272 sizeof(struct ubifs_inode) - sizeof(struct inode));
273 mutex_init(&ui->ui_mutex);
274 init_rwsem(&ui->xattr_sem);
275 spin_lock_init(&ui->ui_lock);
276 return &ui->vfs_inode;
279 static void ubifs_free_inode(struct inode *inode)
281 struct ubifs_inode *ui = ubifs_inode(inode);
284 fscrypt_free_inode(inode);
286 kmem_cache_free(ubifs_inode_slab, ui);
290 * Note, Linux write-back code calls this without 'i_mutex'.
292 static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
295 struct ubifs_info *c = inode->i_sb->s_fs_info;
296 struct ubifs_inode *ui = ubifs_inode(inode);
298 ubifs_assert(c, !ui->xattr);
299 if (is_bad_inode(inode))
302 mutex_lock(&ui->ui_mutex);
304 * Due to races between write-back forced by budgeting
305 * (see 'sync_some_inodes()') and background write-back, the inode may
306 * have already been synchronized, do not do this again. This might
307 * also happen if it was synchronized in an VFS operation, e.g.
311 mutex_unlock(&ui->ui_mutex);
316 * As an optimization, do not write orphan inodes to the media just
317 * because this is not needed.
319 dbg_gen("inode %lu, mode %#x, nlink %u",
320 inode->i_ino, (int)inode->i_mode, inode->i_nlink);
321 if (inode->i_nlink) {
322 err = ubifs_jnl_write_inode(c, inode);
324 ubifs_err(c, "can't write inode %lu, error %d",
327 err = dbg_check_inode_size(c, inode, ui->ui_size);
331 mutex_unlock(&ui->ui_mutex);
332 ubifs_release_dirty_inode_budget(c, ui);
336 static int ubifs_drop_inode(struct inode *inode)
338 int drop = generic_drop_inode(inode);
341 drop = fscrypt_drop_inode(inode);
346 static void ubifs_evict_inode(struct inode *inode)
349 struct ubifs_info *c = inode->i_sb->s_fs_info;
350 struct ubifs_inode *ui = ubifs_inode(inode);
354 * Extended attribute inode deletions are fully handled in
355 * 'ubifs_removexattr()'. These inodes are special and have
356 * limited usage, so there is nothing to do here.
360 dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
361 ubifs_assert(c, !atomic_read(&inode->i_count));
363 truncate_inode_pages_final(&inode->i_data);
368 if (is_bad_inode(inode))
371 ui->ui_size = inode->i_size = 0;
372 err = ubifs_jnl_delete_inode(c, inode);
375 * Worst case we have a lost orphan inode wasting space, so a
376 * simple error message is OK here.
378 ubifs_err(c, "can't delete inode %lu, error %d",
383 ubifs_release_dirty_inode_budget(c, ui);
385 /* We've deleted something - clean the "no space" flags */
386 c->bi.nospace = c->bi.nospace_rp = 0;
391 fscrypt_put_encryption_info(inode);
394 static void ubifs_dirty_inode(struct inode *inode, int flags)
396 struct ubifs_info *c = inode->i_sb->s_fs_info;
397 struct ubifs_inode *ui = ubifs_inode(inode);
399 ubifs_assert(c, mutex_is_locked(&ui->ui_mutex));
402 dbg_gen("inode %lu", inode->i_ino);
406 static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
408 struct ubifs_info *c = dentry->d_sb->s_fs_info;
409 unsigned long long free;
410 __le32 *uuid = (__le32 *)c->uuid;
412 free = ubifs_get_free_space(c);
413 dbg_gen("free space %lld bytes (%lld blocks)",
414 free, free >> UBIFS_BLOCK_SHIFT);
416 buf->f_type = UBIFS_SUPER_MAGIC;
417 buf->f_bsize = UBIFS_BLOCK_SIZE;
418 buf->f_blocks = c->block_cnt;
419 buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
420 if (free > c->report_rp_size)
421 buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
426 buf->f_namelen = UBIFS_MAX_NLEN;
427 buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
428 buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
429 ubifs_assert(c, buf->f_bfree <= c->block_cnt);
433 static int ubifs_show_options(struct seq_file *s, struct dentry *root)
435 struct ubifs_info *c = root->d_sb->s_fs_info;
437 if (c->mount_opts.unmount_mode == 2)
438 seq_puts(s, ",fast_unmount");
439 else if (c->mount_opts.unmount_mode == 1)
440 seq_puts(s, ",norm_unmount");
442 if (c->mount_opts.bulk_read == 2)
443 seq_puts(s, ",bulk_read");
444 else if (c->mount_opts.bulk_read == 1)
445 seq_puts(s, ",no_bulk_read");
447 if (c->mount_opts.chk_data_crc == 2)
448 seq_puts(s, ",chk_data_crc");
449 else if (c->mount_opts.chk_data_crc == 1)
450 seq_puts(s, ",no_chk_data_crc");
452 if (c->mount_opts.override_compr) {
453 seq_printf(s, ",compr=%s",
454 ubifs_compr_name(c, c->mount_opts.compr_type));
457 seq_printf(s, ",assert=%s", ubifs_assert_action_name(c));
458 seq_printf(s, ",ubi=%d,vol=%d", c->vi.ubi_num, c->vi.vol_id);
463 static int ubifs_sync_fs(struct super_block *sb, int wait)
466 struct ubifs_info *c = sb->s_fs_info;
469 * Zero @wait is just an advisory thing to help the file system shove
470 * lots of data into the queues, and there will be the second
471 * '->sync_fs()' call, with non-zero @wait.
477 * Synchronize write buffers, because 'ubifs_run_commit()' does not
478 * do this if it waits for an already running commit.
480 for (i = 0; i < c->jhead_cnt; i++) {
481 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
487 * Strictly speaking, it is not necessary to commit the journal here,
488 * synchronizing write-buffers would be enough. But committing makes
489 * UBIFS free space predictions much more accurate, so we want to let
490 * the user be able to get more accurate results of 'statfs()' after
491 * they synchronize the file system.
493 err = ubifs_run_commit(c);
497 return ubi_sync(c->vi.ubi_num);
501 * init_constants_early - initialize UBIFS constants.
502 * @c: UBIFS file-system description object
504 * This function initialize UBIFS constants which do not need the superblock to
505 * be read. It also checks that the UBI volume satisfies basic UBIFS
506 * requirements. Returns zero in case of success and a negative error code in
509 static int init_constants_early(struct ubifs_info *c)
511 if (c->vi.corrupted) {
512 ubifs_warn(c, "UBI volume is corrupted - read-only mode");
517 ubifs_msg(c, "read-only UBI device");
521 if (c->vi.vol_type == UBI_STATIC_VOLUME) {
522 ubifs_msg(c, "static UBI volume - read-only mode");
526 c->leb_cnt = c->vi.size;
527 c->leb_size = c->vi.usable_leb_size;
528 c->leb_start = c->di.leb_start;
529 c->half_leb_size = c->leb_size / 2;
530 c->min_io_size = c->di.min_io_size;
531 c->min_io_shift = fls(c->min_io_size) - 1;
532 c->max_write_size = c->di.max_write_size;
533 c->max_write_shift = fls(c->max_write_size) - 1;
535 if (c->leb_size < UBIFS_MIN_LEB_SZ) {
536 ubifs_errc(c, "too small LEBs (%d bytes), min. is %d bytes",
537 c->leb_size, UBIFS_MIN_LEB_SZ);
541 if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
542 ubifs_errc(c, "too few LEBs (%d), min. is %d",
543 c->leb_cnt, UBIFS_MIN_LEB_CNT);
547 if (!is_power_of_2(c->min_io_size)) {
548 ubifs_errc(c, "bad min. I/O size %d", c->min_io_size);
553 * Maximum write size has to be greater or equivalent to min. I/O
554 * size, and be multiple of min. I/O size.
556 if (c->max_write_size < c->min_io_size ||
557 c->max_write_size % c->min_io_size ||
558 !is_power_of_2(c->max_write_size)) {
559 ubifs_errc(c, "bad write buffer size %d for %d min. I/O unit",
560 c->max_write_size, c->min_io_size);
565 * UBIFS aligns all node to 8-byte boundary, so to make function in
566 * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
569 if (c->min_io_size < 8) {
572 if (c->max_write_size < c->min_io_size) {
573 c->max_write_size = c->min_io_size;
574 c->max_write_shift = c->min_io_shift;
578 c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
579 c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size);
582 * Initialize node length ranges which are mostly needed for node
585 c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ;
586 c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ;
587 c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ;
588 c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
589 c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
590 c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
591 c->ranges[UBIFS_AUTH_NODE].min_len = UBIFS_AUTH_NODE_SZ;
592 c->ranges[UBIFS_AUTH_NODE].max_len = UBIFS_AUTH_NODE_SZ +
594 c->ranges[UBIFS_SIG_NODE].min_len = UBIFS_SIG_NODE_SZ;
595 c->ranges[UBIFS_SIG_NODE].max_len = c->leb_size - UBIFS_SB_NODE_SZ;
597 c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
598 c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
599 c->ranges[UBIFS_ORPH_NODE].min_len =
600 UBIFS_ORPH_NODE_SZ + sizeof(__le64);
601 c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size;
602 c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ;
603 c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ;
604 c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ;
605 c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ;
606 c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ;
607 c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ;
609 * Minimum indexing node size is amended later when superblock is
610 * read and the key length is known.
612 c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ;
614 * Maximum indexing node size is amended later when superblock is
615 * read and the fanout is known.
617 c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX;
620 * Initialize dead and dark LEB space watermarks. See gc.c for comments
621 * about these values.
623 c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
624 c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
627 * Calculate how many bytes would be wasted at the end of LEB if it was
628 * fully filled with data nodes of maximum size. This is used in
629 * calculations when reporting free space.
631 c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
633 /* Buffer size for bulk-reads */
634 c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
635 if (c->max_bu_buf_len > c->leb_size)
636 c->max_bu_buf_len = c->leb_size;
638 /* Log is ready, preserve one LEB for commits. */
639 c->min_log_bytes = c->leb_size;
645 * bud_wbuf_callback - bud LEB write-buffer synchronization call-back.
646 * @c: UBIFS file-system description object
647 * @lnum: LEB the write-buffer was synchronized to
648 * @free: how many free bytes left in this LEB
649 * @pad: how many bytes were padded
651 * This is a callback function which is called by the I/O unit when the
652 * write-buffer is synchronized. We need this to correctly maintain space
653 * accounting in bud logical eraseblocks. This function returns zero in case of
654 * success and a negative error code in case of failure.
656 * This function actually belongs to the journal, but we keep it here because
657 * we want to keep it static.
659 static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
661 return ubifs_update_one_lp(c, lnum, free, pad, 0, 0);
665 * init_constants_sb - initialize UBIFS constants.
666 * @c: UBIFS file-system description object
668 * This is a helper function which initializes various UBIFS constants after
669 * the superblock has been read. It also checks various UBIFS parameters and
670 * makes sure they are all right. Returns zero in case of success and a
671 * negative error code in case of failure.
673 static int init_constants_sb(struct ubifs_info *c)
678 c->main_bytes = (long long)c->main_lebs * c->leb_size;
679 c->max_znode_sz = sizeof(struct ubifs_znode) +
680 c->fanout * sizeof(struct ubifs_zbranch);
682 tmp = ubifs_idx_node_sz(c, 1);
683 c->ranges[UBIFS_IDX_NODE].min_len = tmp;
684 c->min_idx_node_sz = ALIGN(tmp, 8);
686 tmp = ubifs_idx_node_sz(c, c->fanout);
687 c->ranges[UBIFS_IDX_NODE].max_len = tmp;
688 c->max_idx_node_sz = ALIGN(tmp, 8);
690 /* Make sure LEB size is large enough to fit full commit */
691 tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt;
692 tmp = ALIGN(tmp, c->min_io_size);
693 if (tmp > c->leb_size) {
694 ubifs_err(c, "too small LEB size %d, at least %d needed",
700 * Make sure that the log is large enough to fit reference nodes for
701 * all buds plus one reserved LEB.
703 tmp64 = c->max_bud_bytes + c->leb_size - 1;
704 c->max_bud_cnt = div_u64(tmp64, c->leb_size);
705 tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
708 if (c->log_lebs < tmp) {
709 ubifs_err(c, "too small log %d LEBs, required min. %d LEBs",
715 * When budgeting we assume worst-case scenarios when the pages are not
716 * be compressed and direntries are of the maximum size.
718 * Note, data, which may be stored in inodes is budgeted separately, so
719 * it is not included into 'c->bi.inode_budget'.
721 c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE;
722 c->bi.inode_budget = UBIFS_INO_NODE_SZ;
723 c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ;
726 * When the amount of flash space used by buds becomes
727 * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit.
728 * The writers are unblocked when the commit is finished. To avoid
729 * writers to be blocked UBIFS initiates background commit in advance,
730 * when number of bud bytes becomes above the limit defined below.
732 c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4;
735 * Ensure minimum journal size. All the bytes in the journal heads are
736 * considered to be used, when calculating the current journal usage.
737 * Consequently, if the journal is too small, UBIFS will treat it as
740 tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
741 if (c->bg_bud_bytes < tmp64)
742 c->bg_bud_bytes = tmp64;
743 if (c->max_bud_bytes < tmp64 + c->leb_size)
744 c->max_bud_bytes = tmp64 + c->leb_size;
746 err = ubifs_calc_lpt_geom(c);
750 /* Initialize effective LEB size used in budgeting calculations */
751 c->idx_leb_size = c->leb_size - c->max_idx_node_sz;
756 * init_constants_master - initialize UBIFS constants.
757 * @c: UBIFS file-system description object
759 * This is a helper function which initializes various UBIFS constants after
760 * the master node has been read. It also checks various UBIFS parameters and
761 * makes sure they are all right.
763 static void init_constants_master(struct ubifs_info *c)
767 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
768 c->report_rp_size = ubifs_reported_space(c, c->rp_size);
771 * Calculate total amount of FS blocks. This number is not used
772 * internally because it does not make much sense for UBIFS, but it is
773 * necessary to report something for the 'statfs()' call.
775 * Subtract the LEB reserved for GC, the LEB which is reserved for
776 * deletions, minimum LEBs for the index, and assume only one journal
779 tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
780 tmp64 *= (long long)c->leb_size - c->leb_overhead;
781 tmp64 = ubifs_reported_space(c, tmp64);
782 c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
786 * take_gc_lnum - reserve GC LEB.
787 * @c: UBIFS file-system description object
789 * This function ensures that the LEB reserved for garbage collection is marked
790 * as "taken" in lprops. We also have to set free space to LEB size and dirty
791 * space to zero, because lprops may contain out-of-date information if the
792 * file-system was un-mounted before it has been committed. This function
793 * returns zero in case of success and a negative error code in case of
796 static int take_gc_lnum(struct ubifs_info *c)
800 if (c->gc_lnum == -1) {
801 ubifs_err(c, "no LEB for GC");
805 /* And we have to tell lprops that this LEB is taken */
806 err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0,
812 * alloc_wbufs - allocate write-buffers.
813 * @c: UBIFS file-system description object
815 * This helper function allocates and initializes UBIFS write-buffers. Returns
816 * zero in case of success and %-ENOMEM in case of failure.
818 static int alloc_wbufs(struct ubifs_info *c)
822 c->jheads = kcalloc(c->jhead_cnt, sizeof(struct ubifs_jhead),
827 /* Initialize journal heads */
828 for (i = 0; i < c->jhead_cnt; i++) {
829 INIT_LIST_HEAD(&c->jheads[i].buds_list);
830 err = ubifs_wbuf_init(c, &c->jheads[i].wbuf);
834 c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback;
835 c->jheads[i].wbuf.jhead = i;
836 c->jheads[i].grouped = 1;
837 c->jheads[i].log_hash = ubifs_hash_get_desc(c);
838 if (IS_ERR(c->jheads[i].log_hash)) {
839 err = PTR_ERR(c->jheads[i].log_hash);
845 * Garbage Collector head does not need to be synchronized by timer.
846 * Also GC head nodes are not grouped.
848 c->jheads[GCHD].wbuf.no_timer = 1;
849 c->jheads[GCHD].grouped = 0;
854 kfree(c->jheads[i].wbuf.buf);
855 kfree(c->jheads[i].wbuf.inodes);
859 kfree(c->jheads[i].wbuf.buf);
860 kfree(c->jheads[i].wbuf.inodes);
861 kfree(c->jheads[i].log_hash);
870 * free_wbufs - free write-buffers.
871 * @c: UBIFS file-system description object
873 static void free_wbufs(struct ubifs_info *c)
878 for (i = 0; i < c->jhead_cnt; i++) {
879 kfree(c->jheads[i].wbuf.buf);
880 kfree(c->jheads[i].wbuf.inodes);
881 kfree(c->jheads[i].log_hash);
889 * free_orphans - free orphans.
890 * @c: UBIFS file-system description object
892 static void free_orphans(struct ubifs_info *c)
894 struct ubifs_orphan *orph;
896 while (c->orph_dnext) {
897 orph = c->orph_dnext;
898 c->orph_dnext = orph->dnext;
899 list_del(&orph->list);
903 while (!list_empty(&c->orph_list)) {
904 orph = list_entry(c->orph_list.next, struct ubifs_orphan, list);
905 list_del(&orph->list);
907 ubifs_err(c, "orphan list not empty at unmount");
915 * free_buds - free per-bud objects.
916 * @c: UBIFS file-system description object
918 static void free_buds(struct ubifs_info *c)
920 struct ubifs_bud *bud, *n;
922 rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb) {
923 kfree(bud->log_hash);
929 * check_volume_empty - check if the UBI volume is empty.
930 * @c: UBIFS file-system description object
932 * This function checks if the UBIFS volume is empty by looking if its LEBs are
933 * mapped or not. The result of checking is stored in the @c->empty variable.
934 * Returns zero in case of success and a negative error code in case of
937 static int check_volume_empty(struct ubifs_info *c)
942 for (lnum = 0; lnum < c->leb_cnt; lnum++) {
943 err = ubifs_is_mapped(c, lnum);
944 if (unlikely(err < 0))
958 * UBIFS mount options.
960 * Opt_fast_unmount: do not run a journal commit before un-mounting
961 * Opt_norm_unmount: run a journal commit before un-mounting
962 * Opt_bulk_read: enable bulk-reads
963 * Opt_no_bulk_read: disable bulk-reads
964 * Opt_chk_data_crc: check CRCs when reading data nodes
965 * Opt_no_chk_data_crc: do not check CRCs when reading data nodes
966 * Opt_override_compr: override default compressor
967 * Opt_assert: set ubifs_assert() action
968 * Opt_auth_key: The key name used for authentication
969 * Opt_auth_hash_name: The hash type used for authentication
970 * Opt_err: just end of array marker
987 static const match_table_t tokens = {
988 {Opt_fast_unmount, "fast_unmount"},
989 {Opt_norm_unmount, "norm_unmount"},
990 {Opt_bulk_read, "bulk_read"},
991 {Opt_no_bulk_read, "no_bulk_read"},
992 {Opt_chk_data_crc, "chk_data_crc"},
993 {Opt_no_chk_data_crc, "no_chk_data_crc"},
994 {Opt_override_compr, "compr=%s"},
995 {Opt_auth_key, "auth_key=%s"},
996 {Opt_auth_hash_name, "auth_hash_name=%s"},
997 {Opt_ignore, "ubi=%s"},
998 {Opt_ignore, "vol=%s"},
999 {Opt_assert, "assert=%s"},
1004 * parse_standard_option - parse a standard mount option.
1005 * @option: the option to parse
1007 * Normally, standard mount options like "sync" are passed to file-systems as
1008 * flags. However, when a "rootflags=" kernel boot parameter is used, they may
1009 * be present in the options string. This function tries to deal with this
1010 * situation and parse standard options. Returns 0 if the option was not
1011 * recognized, and the corresponding integer flag if it was.
1013 * UBIFS is only interested in the "sync" option, so do not check for anything
1016 static int parse_standard_option(const char *option)
1019 pr_notice("UBIFS: parse %s\n", option);
1020 if (!strcmp(option, "sync"))
1021 return SB_SYNCHRONOUS;
1026 * ubifs_parse_options - parse mount parameters.
1027 * @c: UBIFS file-system description object
1028 * @options: parameters to parse
1029 * @is_remount: non-zero if this is FS re-mount
1031 * This function parses UBIFS mount options and returns zero in case success
1032 * and a negative error code in case of failure.
1034 static int ubifs_parse_options(struct ubifs_info *c, char *options,
1038 substring_t args[MAX_OPT_ARGS];
1043 while ((p = strsep(&options, ","))) {
1049 token = match_token(p, tokens, args);
1052 * %Opt_fast_unmount and %Opt_norm_unmount options are ignored.
1053 * We accept them in order to be backward-compatible. But this
1054 * should be removed at some point.
1056 case Opt_fast_unmount:
1057 c->mount_opts.unmount_mode = 2;
1059 case Opt_norm_unmount:
1060 c->mount_opts.unmount_mode = 1;
1063 c->mount_opts.bulk_read = 2;
1066 case Opt_no_bulk_read:
1067 c->mount_opts.bulk_read = 1;
1070 case Opt_chk_data_crc:
1071 c->mount_opts.chk_data_crc = 2;
1072 c->no_chk_data_crc = 0;
1074 case Opt_no_chk_data_crc:
1075 c->mount_opts.chk_data_crc = 1;
1076 c->no_chk_data_crc = 1;
1078 case Opt_override_compr:
1080 char *name = match_strdup(&args[0]);
1084 if (!strcmp(name, "none"))
1085 c->mount_opts.compr_type = UBIFS_COMPR_NONE;
1086 else if (!strcmp(name, "lzo"))
1087 c->mount_opts.compr_type = UBIFS_COMPR_LZO;
1088 else if (!strcmp(name, "zlib"))
1089 c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
1090 else if (!strcmp(name, "zstd"))
1091 c->mount_opts.compr_type = UBIFS_COMPR_ZSTD;
1093 ubifs_err(c, "unknown compressor \"%s\"", name); //FIXME: is c ready?
1098 c->mount_opts.override_compr = 1;
1099 c->default_compr = c->mount_opts.compr_type;
1104 char *act = match_strdup(&args[0]);
1108 if (!strcmp(act, "report"))
1109 c->assert_action = ASSACT_REPORT;
1110 else if (!strcmp(act, "read-only"))
1111 c->assert_action = ASSACT_RO;
1112 else if (!strcmp(act, "panic"))
1113 c->assert_action = ASSACT_PANIC;
1115 ubifs_err(c, "unknown assert action \"%s\"", act);
1124 c->auth_key_name = kstrdup(args[0].from,
1126 if (!c->auth_key_name)
1130 case Opt_auth_hash_name:
1132 c->auth_hash_name = kstrdup(args[0].from,
1134 if (!c->auth_hash_name)
1143 struct super_block *sb = c->vfs_sb;
1145 flag = parse_standard_option(p);
1147 ubifs_err(c, "unrecognized mount option \"%s\" or missing value",
1151 sb->s_flags |= flag;
1161 * ubifs_release_options - release mount parameters which have been dumped.
1162 * @c: UBIFS file-system description object
1164 static void ubifs_release_options(struct ubifs_info *c)
1166 kfree(c->auth_key_name);
1167 c->auth_key_name = NULL;
1168 kfree(c->auth_hash_name);
1169 c->auth_hash_name = NULL;
1173 * destroy_journal - destroy journal data structures.
1174 * @c: UBIFS file-system description object
1176 * This function destroys journal data structures including those that may have
1177 * been created by recovery functions.
1179 static void destroy_journal(struct ubifs_info *c)
1181 while (!list_empty(&c->unclean_leb_list)) {
1182 struct ubifs_unclean_leb *ucleb;
1184 ucleb = list_entry(c->unclean_leb_list.next,
1185 struct ubifs_unclean_leb, list);
1186 list_del(&ucleb->list);
1189 while (!list_empty(&c->old_buds)) {
1190 struct ubifs_bud *bud;
1192 bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
1193 list_del(&bud->list);
1194 kfree(bud->log_hash);
1197 ubifs_destroy_idx_gc(c);
1198 ubifs_destroy_size_tree(c);
1204 * bu_init - initialize bulk-read information.
1205 * @c: UBIFS file-system description object
1207 static void bu_init(struct ubifs_info *c)
1209 ubifs_assert(c, c->bulk_read == 1);
1212 return; /* Already initialized */
1215 c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
1217 if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
1218 c->max_bu_buf_len = UBIFS_KMALLOC_OK;
1222 /* Just disable bulk-read */
1223 ubifs_warn(c, "cannot allocate %d bytes of memory for bulk-read, disabling it",
1225 c->mount_opts.bulk_read = 1;
1232 * check_free_space - check if there is enough free space to mount.
1233 * @c: UBIFS file-system description object
1235 * This function makes sure UBIFS has enough free space to be mounted in
1236 * read/write mode. UBIFS must always have some free space to allow deletions.
1238 static int check_free_space(struct ubifs_info *c)
1240 ubifs_assert(c, c->dark_wm > 0);
1241 if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {
1242 ubifs_err(c, "insufficient free space to mount in R/W mode");
1243 ubifs_dump_budg(c, &c->bi);
1244 ubifs_dump_lprops(c);
1251 * mount_ubifs - mount UBIFS file-system.
1252 * @c: UBIFS file-system description object
1254 * This function mounts UBIFS file system. Returns zero in case of success and
1255 * a negative error code in case of failure.
1257 static int mount_ubifs(struct ubifs_info *c)
1263 c->ro_mount = !!sb_rdonly(c->vfs_sb);
1264 /* Suppress error messages while probing if SB_SILENT is set */
1265 c->probing = !!(c->vfs_sb->s_flags & SB_SILENT);
1267 err = init_constants_early(c);
1271 err = ubifs_debugging_init(c);
1275 err = ubifs_sysfs_register(c);
1279 err = check_volume_empty(c);
1283 if (c->empty && (c->ro_mount || c->ro_media)) {
1285 * This UBI volume is empty, and read-only, or the file system
1286 * is mounted read-only - we cannot format it.
1288 ubifs_err(c, "can't format empty UBI volume: read-only %s",
1289 c->ro_media ? "UBI volume" : "mount");
1294 if (c->ro_media && !c->ro_mount) {
1295 ubifs_err(c, "cannot mount read-write - read-only media");
1301 * The requirement for the buffer is that it should fit indexing B-tree
1302 * height amount of integers. We assume the height if the TNC tree will
1306 c->bottom_up_buf = kmalloc_array(BOTTOM_UP_HEIGHT, sizeof(int),
1308 if (!c->bottom_up_buf)
1311 c->sbuf = vmalloc(c->leb_size);
1316 c->ileb_buf = vmalloc(c->leb_size);
1321 if (c->bulk_read == 1)
1325 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \
1326 UBIFS_CIPHER_BLOCK_SIZE,
1328 if (!c->write_reserve_buf)
1334 if (c->auth_key_name) {
1335 if (IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) {
1336 err = ubifs_init_authentication(c);
1340 ubifs_err(c, "auth_key_name, but UBIFS is built without"
1341 " authentication support");
1347 err = ubifs_read_superblock(c);
1354 * Make sure the compressor which is set as default in the superblock
1355 * or overridden by mount options is actually compiled in.
1357 if (!ubifs_compr_present(c, c->default_compr)) {
1358 ubifs_err(c, "'compressor \"%s\" is not compiled in",
1359 ubifs_compr_name(c, c->default_compr));
1364 err = init_constants_sb(c);
1368 sz = ALIGN(c->max_idx_node_sz, c->min_io_size) * 2;
1369 c->cbuf = kmalloc(sz, GFP_NOFS);
1375 err = alloc_wbufs(c);
1379 sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
1381 /* Create background thread */
1382 c->bgt = kthread_run(ubifs_bg_thread, c, "%s", c->bgt_name);
1383 if (IS_ERR(c->bgt)) {
1384 err = PTR_ERR(c->bgt);
1386 ubifs_err(c, "cannot spawn \"%s\", error %d",
1392 err = ubifs_read_master(c);
1396 init_constants_master(c);
1398 if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
1399 ubifs_msg(c, "recovery needed");
1400 c->need_recovery = 1;
1403 if (c->need_recovery && !c->ro_mount) {
1404 err = ubifs_recover_inl_heads(c, c->sbuf);
1409 err = ubifs_lpt_init(c, 1, !c->ro_mount);
1413 if (!c->ro_mount && c->space_fixup) {
1414 err = ubifs_fixup_free_space(c);
1419 if (!c->ro_mount && !c->need_recovery) {
1421 * Set the "dirty" flag so that if we reboot uncleanly we
1422 * will notice this immediately on the next mount.
1424 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1425 err = ubifs_write_master(c);
1431 * Handle offline signed images: Now that the master node is
1432 * written and its validation no longer depends on the hash
1433 * in the superblock, we can update the offline signed
1434 * superblock with a HMAC version,
1436 if (ubifs_authenticated(c) && ubifs_hmac_zero(c, c->sup_node->hmac)) {
1437 err = ubifs_hmac_wkm(c, c->sup_node->hmac_wkm);
1440 c->superblock_need_write = 1;
1443 if (!c->ro_mount && c->superblock_need_write) {
1444 err = ubifs_write_sb_node(c, c->sup_node);
1447 c->superblock_need_write = 0;
1450 err = dbg_check_idx_size(c, c->bi.old_idx_sz);
1454 err = ubifs_replay_journal(c);
1458 /* Calculate 'min_idx_lebs' after journal replay */
1459 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
1461 err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount);
1468 err = check_free_space(c);
1472 /* Check for enough log space */
1473 lnum = c->lhead_lnum + 1;
1474 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1475 lnum = UBIFS_LOG_LNUM;
1476 if (lnum == c->ltail_lnum) {
1477 err = ubifs_consolidate_log(c);
1482 if (c->need_recovery) {
1483 if (!ubifs_authenticated(c)) {
1484 err = ubifs_recover_size(c, true);
1489 err = ubifs_rcvry_gc_commit(c);
1493 if (ubifs_authenticated(c)) {
1494 err = ubifs_recover_size(c, false);
1499 err = take_gc_lnum(c);
1504 * GC LEB may contain garbage if there was an unclean
1505 * reboot, and it should be un-mapped.
1507 err = ubifs_leb_unmap(c, c->gc_lnum);
1512 err = dbg_check_lprops(c);
1515 } else if (c->need_recovery) {
1516 err = ubifs_recover_size(c, false);
1521 * Even if we mount read-only, we have to set space in GC LEB
1522 * to proper value because this affects UBIFS free space
1523 * reporting. We do not want to have a situation when
1524 * re-mounting from R/O to R/W changes amount of free space.
1526 err = take_gc_lnum(c);
1531 spin_lock(&ubifs_infos_lock);
1532 list_add_tail(&c->infos_list, &ubifs_infos);
1533 spin_unlock(&ubifs_infos_lock);
1535 if (c->need_recovery) {
1537 ubifs_msg(c, "recovery deferred");
1539 c->need_recovery = 0;
1540 ubifs_msg(c, "recovery completed");
1542 * GC LEB has to be empty and taken at this point. But
1543 * the journal head LEBs may also be accounted as
1544 * "empty taken" if they are empty.
1546 ubifs_assert(c, c->lst.taken_empty_lebs > 0);
1549 ubifs_assert(c, c->lst.taken_empty_lebs > 0);
1551 err = dbg_check_filesystem(c);
1555 dbg_debugfs_init_fs(c);
1559 ubifs_msg(c, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s",
1560 c->vi.ubi_num, c->vi.vol_id, c->vi.name,
1561 c->ro_mount ? ", R/O mode" : "");
1562 x = (long long)c->main_lebs * c->leb_size;
1563 y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
1564 ubifs_msg(c, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
1565 c->leb_size, c->leb_size >> 10, c->min_io_size,
1567 ubifs_msg(c, "FS size: %lld bytes (%lld MiB, %d LEBs), max %d LEBs, journal size %lld bytes (%lld MiB, %d LEBs)",
1568 x, x >> 20, c->main_lebs, c->max_leb_cnt,
1569 y, y >> 20, c->log_lebs + c->max_bud_cnt);
1570 ubifs_msg(c, "reserved for root: %llu bytes (%llu KiB)",
1571 c->report_rp_size, c->report_rp_size >> 10);
1572 ubifs_msg(c, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
1573 c->fmt_version, c->ro_compat_version,
1574 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid,
1575 c->big_lpt ? ", big LPT model" : ", small LPT model");
1577 dbg_gen("default compressor: %s", ubifs_compr_name(c, c->default_compr));
1578 dbg_gen("data journal heads: %d",
1579 c->jhead_cnt - NONDATA_JHEADS_CNT);
1580 dbg_gen("log LEBs: %d (%d - %d)",
1581 c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
1582 dbg_gen("LPT area LEBs: %d (%d - %d)",
1583 c->lpt_lebs, c->lpt_first, c->lpt_last);
1584 dbg_gen("orphan area LEBs: %d (%d - %d)",
1585 c->orph_lebs, c->orph_first, c->orph_last);
1586 dbg_gen("main area LEBs: %d (%d - %d)",
1587 c->main_lebs, c->main_first, c->leb_cnt - 1);
1588 dbg_gen("index LEBs: %d", c->lst.idx_lebs);
1589 dbg_gen("total index bytes: %llu (%llu KiB, %llu MiB)",
1590 c->bi.old_idx_sz, c->bi.old_idx_sz >> 10,
1591 c->bi.old_idx_sz >> 20);
1592 dbg_gen("key hash type: %d", c->key_hash_type);
1593 dbg_gen("tree fanout: %d", c->fanout);
1594 dbg_gen("reserved GC LEB: %d", c->gc_lnum);
1595 dbg_gen("max. znode size %d", c->max_znode_sz);
1596 dbg_gen("max. index node size %d", c->max_idx_node_sz);
1597 dbg_gen("node sizes: data %zu, inode %zu, dentry %zu",
1598 UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
1599 dbg_gen("node sizes: trun %zu, sb %zu, master %zu",
1600 UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
1601 dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu",
1602 UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
1603 dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
1604 UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
1605 UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout));
1606 dbg_gen("dead watermark: %d", c->dead_wm);
1607 dbg_gen("dark watermark: %d", c->dark_wm);
1608 dbg_gen("LEB overhead: %d", c->leb_overhead);
1609 x = (long long)c->main_lebs * c->dark_wm;
1610 dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)",
1611 x, x >> 10, x >> 20);
1612 dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
1613 c->max_bud_bytes, c->max_bud_bytes >> 10,
1614 c->max_bud_bytes >> 20);
1615 dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
1616 c->bg_bud_bytes, c->bg_bud_bytes >> 10,
1617 c->bg_bud_bytes >> 20);
1618 dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)",
1619 c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
1620 dbg_gen("max. seq. number: %llu", c->max_sqnum);
1621 dbg_gen("commit number: %llu", c->cmt_no);
1622 dbg_gen("max. xattrs per inode: %d", ubifs_xattr_max_cnt(c));
1623 dbg_gen("max orphans: %d", c->max_orphans);
1628 spin_lock(&ubifs_infos_lock);
1629 list_del(&c->infos_list);
1630 spin_unlock(&ubifs_infos_lock);
1636 ubifs_lpt_free(c, 0);
1639 kfree(c->rcvrd_mst_node);
1641 kthread_stop(c->bgt);
1647 ubifs_exit_authentication(c);
1649 kfree(c->write_reserve_buf);
1653 kfree(c->bottom_up_buf);
1655 ubifs_sysfs_unregister(c);
1657 ubifs_debugging_exit(c);
1662 * ubifs_umount - un-mount UBIFS file-system.
1663 * @c: UBIFS file-system description object
1665 * Note, this function is called to free allocated resourced when un-mounting,
1666 * as well as free resources when an error occurred while we were half way
1667 * through mounting (error path cleanup function). So it has to make sure the
1668 * resource was actually allocated before freeing it.
1670 static void ubifs_umount(struct ubifs_info *c)
1672 dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
1675 dbg_debugfs_exit_fs(c);
1676 spin_lock(&ubifs_infos_lock);
1677 list_del(&c->infos_list);
1678 spin_unlock(&ubifs_infos_lock);
1681 kthread_stop(c->bgt);
1686 ubifs_lpt_free(c, 0);
1687 ubifs_exit_authentication(c);
1689 ubifs_release_options(c);
1691 kfree(c->rcvrd_mst_node);
1693 kfree(c->write_reserve_buf);
1697 kfree(c->bottom_up_buf);
1699 ubifs_debugging_exit(c);
1700 ubifs_sysfs_unregister(c);
1704 * ubifs_remount_rw - re-mount in read-write mode.
1705 * @c: UBIFS file-system description object
1707 * UBIFS avoids allocating many unnecessary resources when mounted in read-only
1708 * mode. This function allocates the needed resources and re-mounts UBIFS in
1711 static int ubifs_remount_rw(struct ubifs_info *c)
1715 if (c->rw_incompat) {
1716 ubifs_err(c, "the file-system is not R/W-compatible");
1717 ubifs_msg(c, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
1718 c->fmt_version, c->ro_compat_version,
1719 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
1723 mutex_lock(&c->umount_mutex);
1724 dbg_save_space_info(c);
1725 c->remounting_rw = 1;
1728 if (c->space_fixup) {
1729 err = ubifs_fixup_free_space(c);
1734 err = check_free_space(c);
1738 if (c->need_recovery) {
1739 ubifs_msg(c, "completing deferred recovery");
1740 err = ubifs_write_rcvrd_mst_node(c);
1743 if (!ubifs_authenticated(c)) {
1744 err = ubifs_recover_size(c, true);
1748 err = ubifs_clean_lebs(c, c->sbuf);
1751 err = ubifs_recover_inl_heads(c, c->sbuf);
1755 /* A readonly mount is not allowed to have orphans */
1756 ubifs_assert(c, c->tot_orphans == 0);
1757 err = ubifs_clear_orphans(c);
1762 if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) {
1763 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1764 err = ubifs_write_master(c);
1769 if (c->superblock_need_write) {
1770 struct ubifs_sb_node *sup = c->sup_node;
1772 err = ubifs_write_sb_node(c, sup);
1776 c->superblock_need_write = 0;
1779 c->ileb_buf = vmalloc(c->leb_size);
1785 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \
1786 UBIFS_CIPHER_BLOCK_SIZE, GFP_KERNEL);
1787 if (!c->write_reserve_buf) {
1792 err = ubifs_lpt_init(c, 0, 1);
1796 /* Create background thread */
1797 c->bgt = kthread_run(ubifs_bg_thread, c, "%s", c->bgt_name);
1798 if (IS_ERR(c->bgt)) {
1799 err = PTR_ERR(c->bgt);
1801 ubifs_err(c, "cannot spawn \"%s\", error %d",
1806 c->orph_buf = vmalloc(c->leb_size);
1812 /* Check for enough log space */
1813 lnum = c->lhead_lnum + 1;
1814 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1815 lnum = UBIFS_LOG_LNUM;
1816 if (lnum == c->ltail_lnum) {
1817 err = ubifs_consolidate_log(c);
1822 if (c->need_recovery) {
1823 err = ubifs_rcvry_gc_commit(c);
1827 if (ubifs_authenticated(c)) {
1828 err = ubifs_recover_size(c, false);
1833 err = ubifs_leb_unmap(c, c->gc_lnum);
1838 dbg_gen("re-mounted read-write");
1839 c->remounting_rw = 0;
1841 if (c->need_recovery) {
1842 c->need_recovery = 0;
1843 ubifs_msg(c, "deferred recovery completed");
1846 * Do not run the debugging space check if the were doing
1847 * recovery, because when we saved the information we had the
1848 * file-system in a state where the TNC and lprops has been
1849 * modified in memory, but all the I/O operations (including a
1850 * commit) were deferred. So the file-system was in
1851 * "non-committed" state. Now the file-system is in committed
1852 * state, and of course the amount of free space will change
1853 * because, for example, the old index size was imprecise.
1855 err = dbg_check_space_info(c);
1858 mutex_unlock(&c->umount_mutex);
1866 kthread_stop(c->bgt);
1869 kfree(c->write_reserve_buf);
1870 c->write_reserve_buf = NULL;
1873 ubifs_lpt_free(c, 1);
1874 c->remounting_rw = 0;
1875 mutex_unlock(&c->umount_mutex);
1880 * ubifs_remount_ro - re-mount in read-only mode.
1881 * @c: UBIFS file-system description object
1883 * We assume VFS has stopped writing. Possibly the background thread could be
1884 * running a commit, however kthread_stop will wait in that case.
1886 static void ubifs_remount_ro(struct ubifs_info *c)
1890 ubifs_assert(c, !c->need_recovery);
1891 ubifs_assert(c, !c->ro_mount);
1893 mutex_lock(&c->umount_mutex);
1895 kthread_stop(c->bgt);
1899 dbg_save_space_info(c);
1901 for (i = 0; i < c->jhead_cnt; i++) {
1902 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
1904 ubifs_ro_mode(c, err);
1907 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1908 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1909 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1910 err = ubifs_write_master(c);
1912 ubifs_ro_mode(c, err);
1916 kfree(c->write_reserve_buf);
1917 c->write_reserve_buf = NULL;
1920 ubifs_lpt_free(c, 1);
1922 err = dbg_check_space_info(c);
1924 ubifs_ro_mode(c, err);
1925 mutex_unlock(&c->umount_mutex);
1928 static void ubifs_put_super(struct super_block *sb)
1931 struct ubifs_info *c = sb->s_fs_info;
1933 ubifs_msg(c, "un-mount UBI device %d", c->vi.ubi_num);
1936 * The following asserts are only valid if there has not been a failure
1937 * of the media. For example, there will be dirty inodes if we failed
1938 * to write them back because of I/O errors.
1941 ubifs_assert(c, c->bi.idx_growth == 0);
1942 ubifs_assert(c, c->bi.dd_growth == 0);
1943 ubifs_assert(c, c->bi.data_growth == 0);
1947 * The 'c->umount_lock' prevents races between UBIFS memory shrinker
1948 * and file system un-mount. Namely, it prevents the shrinker from
1949 * picking this superblock for shrinking - it will be just skipped if
1950 * the mutex is locked.
1952 mutex_lock(&c->umount_mutex);
1955 * First of all kill the background thread to make sure it does
1956 * not interfere with un-mounting and freeing resources.
1959 kthread_stop(c->bgt);
1964 * On fatal errors c->ro_error is set to 1, in which case we do
1965 * not write the master node.
1970 /* Synchronize write-buffers */
1971 for (i = 0; i < c->jhead_cnt; i++) {
1972 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
1974 ubifs_ro_mode(c, err);
1978 * We are being cleanly unmounted which means the
1979 * orphans were killed - indicate this in the master
1980 * node. Also save the reserved GC LEB number.
1982 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1983 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1984 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1985 err = ubifs_write_master(c);
1988 * Recovery will attempt to fix the master area
1989 * next mount, so we just print a message and
1990 * continue to unmount normally.
1992 ubifs_err(c, "failed to write master node, error %d",
1995 for (i = 0; i < c->jhead_cnt; i++)
1996 /* Make sure write-buffer timers are canceled */
1997 hrtimer_cancel(&c->jheads[i].wbuf.timer);
2002 ubi_close_volume(c->ubi);
2003 mutex_unlock(&c->umount_mutex);
2006 static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
2009 struct ubifs_info *c = sb->s_fs_info;
2011 sync_filesystem(sb);
2012 dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags);
2014 err = ubifs_parse_options(c, data, 1);
2016 ubifs_err(c, "invalid or unknown remount parameter");
2020 if (c->ro_mount && !(*flags & SB_RDONLY)) {
2022 ubifs_msg(c, "cannot re-mount R/W due to prior errors");
2026 ubifs_msg(c, "cannot re-mount R/W - UBI volume is R/O");
2029 err = ubifs_remount_rw(c);
2032 } else if (!c->ro_mount && (*flags & SB_RDONLY)) {
2034 ubifs_msg(c, "cannot re-mount R/O due to prior errors");
2037 ubifs_remount_ro(c);
2040 if (c->bulk_read == 1)
2043 dbg_gen("disable bulk-read");
2044 mutex_lock(&c->bu_mutex);
2047 mutex_unlock(&c->bu_mutex);
2050 if (!c->need_recovery)
2051 ubifs_assert(c, c->lst.taken_empty_lebs > 0);
2056 const struct super_operations ubifs_super_operations = {
2057 .alloc_inode = ubifs_alloc_inode,
2058 .free_inode = ubifs_free_inode,
2059 .put_super = ubifs_put_super,
2060 .write_inode = ubifs_write_inode,
2061 .drop_inode = ubifs_drop_inode,
2062 .evict_inode = ubifs_evict_inode,
2063 .statfs = ubifs_statfs,
2064 .dirty_inode = ubifs_dirty_inode,
2065 .remount_fs = ubifs_remount_fs,
2066 .show_options = ubifs_show_options,
2067 .sync_fs = ubifs_sync_fs,
2071 * open_ubi - parse UBI device name string and open the UBI device.
2072 * @name: UBI volume name
2073 * @mode: UBI volume open mode
2075 * The primary method of mounting UBIFS is by specifying the UBI volume
2076 * character device node path. However, UBIFS may also be mounted without any
2077 * character device node using one of the following methods:
2079 * o ubiX_Y - mount UBI device number X, volume Y;
2080 * o ubiY - mount UBI device number 0, volume Y;
2081 * o ubiX:NAME - mount UBI device X, volume with name NAME;
2082 * o ubi:NAME - mount UBI device 0, volume with name NAME.
2084 * Alternative '!' separator may be used instead of ':' (because some shells
2085 * like busybox may interpret ':' as an NFS host name separator). This function
2086 * returns UBI volume description object in case of success and a negative
2087 * error code in case of failure.
2089 static struct ubi_volume_desc *open_ubi(const char *name, int mode)
2091 struct ubi_volume_desc *ubi;
2095 if (!name || !*name)
2096 return ERR_PTR(-EINVAL);
2098 /* First, try to open using the device node path method */
2099 ubi = ubi_open_volume_path(name, mode);
2103 /* Try the "nodev" method */
2104 if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
2105 return ERR_PTR(-EINVAL);
2107 /* ubi:NAME method */
2108 if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
2109 return ubi_open_volume_nm(0, name + 4, mode);
2111 if (!isdigit(name[3]))
2112 return ERR_PTR(-EINVAL);
2114 dev = simple_strtoul(name + 3, &endptr, 0);
2117 if (*endptr == '\0')
2118 return ubi_open_volume(0, dev, mode);
2121 if (*endptr == '_' && isdigit(endptr[1])) {
2122 vol = simple_strtoul(endptr + 1, &endptr, 0);
2123 if (*endptr != '\0')
2124 return ERR_PTR(-EINVAL);
2125 return ubi_open_volume(dev, vol, mode);
2128 /* ubiX:NAME method */
2129 if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
2130 return ubi_open_volume_nm(dev, ++endptr, mode);
2132 return ERR_PTR(-EINVAL);
2135 static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
2137 struct ubifs_info *c;
2139 c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
2141 spin_lock_init(&c->cnt_lock);
2142 spin_lock_init(&c->cs_lock);
2143 spin_lock_init(&c->buds_lock);
2144 spin_lock_init(&c->space_lock);
2145 spin_lock_init(&c->orphan_lock);
2146 init_rwsem(&c->commit_sem);
2147 mutex_init(&c->lp_mutex);
2148 mutex_init(&c->tnc_mutex);
2149 mutex_init(&c->log_mutex);
2150 mutex_init(&c->umount_mutex);
2151 mutex_init(&c->bu_mutex);
2152 mutex_init(&c->write_reserve_mutex);
2153 init_waitqueue_head(&c->cmt_wq);
2155 c->old_idx = RB_ROOT;
2156 c->size_tree = RB_ROOT;
2157 c->orph_tree = RB_ROOT;
2158 INIT_LIST_HEAD(&c->infos_list);
2159 INIT_LIST_HEAD(&c->idx_gc);
2160 INIT_LIST_HEAD(&c->replay_list);
2161 INIT_LIST_HEAD(&c->replay_buds);
2162 INIT_LIST_HEAD(&c->uncat_list);
2163 INIT_LIST_HEAD(&c->empty_list);
2164 INIT_LIST_HEAD(&c->freeable_list);
2165 INIT_LIST_HEAD(&c->frdi_idx_list);
2166 INIT_LIST_HEAD(&c->unclean_leb_list);
2167 INIT_LIST_HEAD(&c->old_buds);
2168 INIT_LIST_HEAD(&c->orph_list);
2169 INIT_LIST_HEAD(&c->orph_new);
2170 c->no_chk_data_crc = 1;
2171 c->assert_action = ASSACT_RO;
2173 c->highest_inum = UBIFS_FIRST_INO;
2174 c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
2176 ubi_get_volume_info(ubi, &c->vi);
2177 ubi_get_device_info(c->vi.ubi_num, &c->di);
2182 static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
2184 struct ubifs_info *c = sb->s_fs_info;
2189 /* Re-open the UBI device in read-write mode */
2190 c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
2191 if (IS_ERR(c->ubi)) {
2192 err = PTR_ERR(c->ubi);
2196 err = ubifs_parse_options(c, data, 0);
2201 * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For
2202 * UBIFS, I/O is not deferred, it is done immediately in read_folio,
2203 * which means the user would have to wait not just for their own I/O
2204 * but the read-ahead I/O as well i.e. completely pointless.
2206 * Read-ahead will be disabled because @sb->s_bdi->ra_pages is 0. Also
2207 * @sb->s_bdi->capabilities are initialized to 0 so there won't be any
2208 * writeback happening.
2210 err = super_setup_bdi_name(sb, "ubifs_%d_%d", c->vi.ubi_num,
2214 sb->s_bdi->ra_pages = 0;
2215 sb->s_bdi->io_pages = 0;
2218 sb->s_magic = UBIFS_SUPER_MAGIC;
2219 sb->s_blocksize = UBIFS_BLOCK_SIZE;
2220 sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
2221 sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
2222 if (c->max_inode_sz > MAX_LFS_FILESIZE)
2223 sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
2224 sb->s_op = &ubifs_super_operations;
2225 sb->s_xattr = ubifs_xattr_handlers;
2226 fscrypt_set_ops(sb, &ubifs_crypt_operations);
2228 mutex_lock(&c->umount_mutex);
2229 err = mount_ubifs(c);
2231 ubifs_assert(c, err < 0);
2235 /* Read the root inode */
2236 root = ubifs_iget(sb, UBIFS_ROOT_INO);
2238 err = PTR_ERR(root);
2242 sb->s_root = d_make_root(root);
2248 import_uuid(&sb->s_uuid, c->uuid);
2250 mutex_unlock(&c->umount_mutex);
2256 mutex_unlock(&c->umount_mutex);
2258 ubifs_release_options(c);
2259 ubi_close_volume(c->ubi);
2264 static int sb_test(struct super_block *sb, void *data)
2266 struct ubifs_info *c1 = data;
2267 struct ubifs_info *c = sb->s_fs_info;
2269 return c->vi.cdev == c1->vi.cdev;
2272 static int sb_set(struct super_block *sb, void *data)
2274 sb->s_fs_info = data;
2275 return set_anon_super(sb, NULL);
2278 static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
2279 const char *name, void *data)
2281 struct ubi_volume_desc *ubi;
2282 struct ubifs_info *c;
2283 struct super_block *sb;
2286 dbg_gen("name %s, flags %#x", name, flags);
2289 * Get UBI device number and volume ID. Mount it read-only so far
2290 * because this might be a new mount point, and UBI allows only one
2291 * read-write user at a time.
2293 ubi = open_ubi(name, UBI_READONLY);
2295 if (!(flags & SB_SILENT))
2296 pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d",
2297 current->pid, name, (int)PTR_ERR(ubi));
2298 return ERR_CAST(ubi);
2301 c = alloc_ubifs_info(ubi);
2307 dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
2309 sb = sget(fs_type, sb_test, sb_set, flags, c);
2317 struct ubifs_info *c1 = sb->s_fs_info;
2319 /* A new mount point for already mounted UBIFS */
2320 dbg_gen("this ubi volume is already mounted");
2321 if (!!(flags & SB_RDONLY) != c1->ro_mount) {
2326 err = ubifs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
2329 /* We do not support atime */
2330 sb->s_flags |= SB_ACTIVE;
2331 if (IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT))
2332 ubifs_msg(c, "full atime support is enabled.");
2334 sb->s_flags |= SB_NOATIME;
2337 /* 'fill_super()' opens ubi again so we must close it here */
2338 ubi_close_volume(ubi);
2340 return dget(sb->s_root);
2343 deactivate_locked_super(sb);
2345 ubi_close_volume(ubi);
2346 return ERR_PTR(err);
2349 static void kill_ubifs_super(struct super_block *s)
2351 struct ubifs_info *c = s->s_fs_info;
2356 static struct file_system_type ubifs_fs_type = {
2358 .owner = THIS_MODULE,
2359 .mount = ubifs_mount,
2360 .kill_sb = kill_ubifs_super,
2362 MODULE_ALIAS_FS("ubifs");
2365 * Inode slab cache constructor.
2367 static void inode_slab_ctor(void *obj)
2369 struct ubifs_inode *ui = obj;
2370 inode_init_once(&ui->vfs_inode);
2373 static int __init ubifs_init(void)
2377 BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
2379 /* Make sure node sizes are 8-byte aligned */
2380 BUILD_BUG_ON(UBIFS_CH_SZ & 7);
2381 BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7);
2382 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
2383 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
2384 BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
2385 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
2386 BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7);
2387 BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7);
2388 BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7);
2389 BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7);
2390 BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
2392 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
2393 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
2394 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
2395 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7);
2396 BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7);
2397 BUILD_BUG_ON(MIN_WRITE_SZ & 7);
2399 /* Check min. node size */
2400 BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ);
2401 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
2402 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
2403 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
2405 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2406 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2407 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
2408 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ);
2410 /* Defined node sizes */
2411 BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096);
2412 BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
2413 BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
2414 BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
2417 * We use 2 bit wide bit-fields to store compression type, which should
2418 * be amended if more compressors are added. The bit-fields are:
2419 * @compr_type in 'struct ubifs_inode', @default_compr in
2420 * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'.
2422 BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
2425 * We require that PAGE_SIZE is greater-than-or-equal-to
2426 * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
2428 if (PAGE_SIZE < UBIFS_BLOCK_SIZE) {
2429 pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes",
2430 current->pid, (unsigned int)PAGE_SIZE);
2434 ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
2435 sizeof(struct ubifs_inode), 0,
2436 SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT |
2437 SLAB_ACCOUNT, &inode_slab_ctor);
2438 if (!ubifs_inode_slab)
2441 ubifs_shrinker_info = shrinker_alloc(0, "ubifs-slab");
2442 if (!ubifs_shrinker_info)
2445 ubifs_shrinker_info->count_objects = ubifs_shrink_count;
2446 ubifs_shrinker_info->scan_objects = ubifs_shrink_scan;
2448 shrinker_register(ubifs_shrinker_info);
2450 err = ubifs_compressors_init();
2456 err = ubifs_sysfs_init();
2460 err = register_filesystem(&ubifs_fs_type);
2462 pr_err("UBIFS error (pid %d): cannot register file system, error %d",
2472 ubifs_compressors_exit();
2474 shrinker_free(ubifs_shrinker_info);
2476 kmem_cache_destroy(ubifs_inode_slab);
2479 /* late_initcall to let compressors initialize first */
2480 late_initcall(ubifs_init);
2482 static void __exit ubifs_exit(void)
2484 WARN_ON(!list_empty(&ubifs_infos));
2485 WARN_ON(atomic_long_read(&ubifs_clean_zn_cnt) != 0);
2489 ubifs_compressors_exit();
2490 shrinker_free(ubifs_shrinker_info);
2493 * Make sure all delayed rcu free inodes are flushed before we
2497 kmem_cache_destroy(ubifs_inode_slab);
2498 unregister_filesystem(&ubifs_fs_type);
2500 module_exit(ubifs_exit);
2502 MODULE_LICENSE("GPL");
2503 MODULE_VERSION(__stringify(UBIFS_VERSION));
2504 MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2505 MODULE_DESCRIPTION("UBIFS - UBI File System");