2 * This file is part of UBIFS.
4 * Copyright (C) 2006-2008 Nokia Corporation.
6 * SPDX-License-Identifier: GPL-2.0+
8 * Authors: Artem Bityutskiy (Битюцкий Артём)
13 * This file implements UBIFS initialization and VFS superblock operations. Some
14 * initialization stuff which is rather large and complex is placed at
15 * corresponding subsystems, but most of it is here.
19 #include <linux/init.h>
20 #include <linux/slab.h>
21 #include <linux/module.h>
22 #include <linux/ctype.h>
23 #include <linux/kthread.h>
24 #include <linux/parser.h>
25 #include <linux/seq_file.h>
26 #include <linux/mount.h>
27 #include <linux/math64.h>
28 #include <linux/writeback.h>
31 #include <linux/compat.h>
32 #include <linux/stat.h>
33 #include <linux/err.h>
35 #include <ubi_uboot.h>
36 #include <mtd/ubi-user.h>
44 #define INODE_LOCKED_MAX 64
46 struct super_block *ubifs_sb;
47 LIST_HEAD(super_blocks);
49 static struct inode *inodes_locked_down[INODE_LOCKED_MAX];
51 int set_anon_super(struct super_block *s, void *data)
56 struct inode *iget_locked(struct super_block *sb, unsigned long ino)
60 inode = (struct inode *)malloc(sizeof(struct ubifs_inode));
64 list_add(&inode->i_sb_list, &sb->s_inodes);
65 inode->i_state = I_LOCK | I_NEW;
71 void iget_failed(struct inode *inode)
75 int ubifs_iput(struct inode *inode)
77 list_del_init(&inode->i_sb_list);
84 * Lock (save) inode in inode array for readback after recovery
86 void iput(struct inode *inode)
94 for (i = 0; i < INODE_LOCKED_MAX; i++) {
95 if (inodes_locked_down[i] == NULL)
99 if (i >= INODE_LOCKED_MAX) {
100 ubifs_err("Error, can't lock (save) more inodes while recovery!!!");
105 * Allocate and use new inode
107 ino = (struct inode *)malloc(sizeof(struct ubifs_inode));
108 memcpy(ino, inode, sizeof(struct ubifs_inode));
111 * Finally save inode in array
113 inodes_locked_down[i] = ino;
116 /* from fs/inode.c */
118 * clear_nlink - directly zero an inode's link count
121 * This is a low-level filesystem helper to replace any
122 * direct filesystem manipulation of i_nlink. See
123 * drop_nlink() for why we care about i_nlink hitting zero.
125 void clear_nlink(struct inode *inode)
127 if (inode->i_nlink) {
128 inode->__i_nlink = 0;
129 atomic_long_inc(&inode->i_sb->s_remove_count);
132 EXPORT_SYMBOL(clear_nlink);
135 * set_nlink - directly set an inode's link count
137 * @nlink: new nlink (should be non-zero)
139 * This is a low-level filesystem helper to replace any
140 * direct filesystem manipulation of i_nlink.
142 void set_nlink(struct inode *inode, unsigned int nlink)
147 /* Yes, some filesystems do change nlink from zero to one */
148 if (inode->i_nlink == 0)
149 atomic_long_dec(&inode->i_sb->s_remove_count);
151 inode->__i_nlink = nlink;
154 EXPORT_SYMBOL(set_nlink);
156 /* from include/linux/fs.h */
157 static inline void i_uid_write(struct inode *inode, uid_t uid)
159 inode->i_uid.val = uid;
162 static inline void i_gid_write(struct inode *inode, gid_t gid)
164 inode->i_gid.val = gid;
167 void unlock_new_inode(struct inode *inode)
174 * Maximum amount of memory we may 'kmalloc()' without worrying that we are
175 * allocating too much.
177 #define UBIFS_KMALLOC_OK (128*1024)
179 /* Slab cache for UBIFS inodes */
180 struct kmem_cache *ubifs_inode_slab;
183 /* UBIFS TNC shrinker description */
184 static struct shrinker ubifs_shrinker_info = {
185 .scan_objects = ubifs_shrink_scan,
186 .count_objects = ubifs_shrink_count,
187 .seeks = DEFAULT_SEEKS,
192 * validate_inode - validate inode.
193 * @c: UBIFS file-system description object
194 * @inode: the inode to validate
196 * This is a helper function for 'ubifs_iget()' which validates various fields
197 * of a newly built inode to make sure they contain sane values and prevent
198 * possible vulnerabilities. Returns zero if the inode is all right and
199 * a non-zero error code if not.
201 static int validate_inode(struct ubifs_info *c, const struct inode *inode)
204 const struct ubifs_inode *ui = ubifs_inode(inode);
206 if (inode->i_size > c->max_inode_sz) {
207 ubifs_err("inode is too large (%lld)",
208 (long long)inode->i_size);
212 if (ui->compr_type < 0 || ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
213 ubifs_err("unknown compression type %d", ui->compr_type);
217 if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX)
220 if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA)
223 if (ui->xattr && !S_ISREG(inode->i_mode))
226 if (!ubifs_compr_present(ui->compr_type)) {
227 ubifs_warn("inode %lu uses '%s' compression, but it was not compiled in",
228 inode->i_ino, ubifs_compr_name(ui->compr_type));
231 err = dbg_check_dir(c, inode);
235 struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
239 struct ubifs_ino_node *ino;
240 struct ubifs_info *c = sb->s_fs_info;
242 struct ubifs_inode *ui;
247 dbg_gen("inode %lu", inum);
251 * U-Boot special handling of locked down inodes via recovery
252 * e.g. ubifs_recover_size()
254 for (i = 0; i < INODE_LOCKED_MAX; i++) {
256 * Exit on last entry (NULL), inode not found in list
258 if (inodes_locked_down[i] == NULL)
261 if (inodes_locked_down[i]->i_ino == inum) {
263 * We found the locked down inode in our array,
264 * so just return this pointer instead of creating
267 return inodes_locked_down[i];
272 inode = iget_locked(sb, inum);
274 return ERR_PTR(-ENOMEM);
275 if (!(inode->i_state & I_NEW))
277 ui = ubifs_inode(inode);
279 ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
285 ino_key_init(c, &key, inode->i_ino);
287 err = ubifs_tnc_lookup(c, &key, ino);
291 inode->i_flags |= (S_NOCMTIME | S_NOATIME);
292 set_nlink(inode, le32_to_cpu(ino->nlink));
293 i_uid_write(inode, le32_to_cpu(ino->uid));
294 i_gid_write(inode, le32_to_cpu(ino->gid));
295 inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec);
296 inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec);
297 inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec);
298 inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec);
299 inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec);
300 inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec);
301 inode->i_mode = le32_to_cpu(ino->mode);
302 inode->i_size = le64_to_cpu(ino->size);
304 ui->data_len = le32_to_cpu(ino->data_len);
305 ui->flags = le32_to_cpu(ino->flags);
306 ui->compr_type = le16_to_cpu(ino->compr_type);
307 ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
308 ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
309 ui->xattr_size = le32_to_cpu(ino->xattr_size);
310 ui->xattr_names = le32_to_cpu(ino->xattr_names);
311 ui->synced_i_size = ui->ui_size = inode->i_size;
313 ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0;
315 err = validate_inode(c, inode);
320 /* Disable read-ahead */
321 inode->i_mapping->backing_dev_info = &c->bdi;
323 switch (inode->i_mode & S_IFMT) {
325 inode->i_mapping->a_ops = &ubifs_file_address_operations;
326 inode->i_op = &ubifs_file_inode_operations;
327 inode->i_fop = &ubifs_file_operations;
329 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
334 memcpy(ui->data, ino->data, ui->data_len);
335 ((char *)ui->data)[ui->data_len] = '\0';
336 } else if (ui->data_len != 0) {
342 inode->i_op = &ubifs_dir_inode_operations;
343 inode->i_fop = &ubifs_dir_operations;
344 if (ui->data_len != 0) {
350 inode->i_op = &ubifs_symlink_inode_operations;
351 if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
355 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
360 memcpy(ui->data, ino->data, ui->data_len);
361 ((char *)ui->data)[ui->data_len] = '\0';
367 union ubifs_dev_desc *dev;
369 ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
375 dev = (union ubifs_dev_desc *)ino->data;
376 if (ui->data_len == sizeof(dev->new))
377 rdev = new_decode_dev(le32_to_cpu(dev->new));
378 else if (ui->data_len == sizeof(dev->huge))
379 rdev = huge_decode_dev(le64_to_cpu(dev->huge));
384 memcpy(ui->data, ino->data, ui->data_len);
385 inode->i_op = &ubifs_file_inode_operations;
386 init_special_inode(inode, inode->i_mode, rdev);
391 inode->i_op = &ubifs_file_inode_operations;
392 init_special_inode(inode, inode->i_mode, 0);
393 if (ui->data_len != 0) {
403 if ((inode->i_mode & S_IFMT) == S_IFLNK) {
404 if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
408 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
413 memcpy(ui->data, ino->data, ui->data_len);
414 ((char *)ui->data)[ui->data_len] = '\0';
420 ubifs_set_inode_flags(inode);
422 unlock_new_inode(inode);
426 ubifs_err("inode %lu validation failed, error %d", inode->i_ino, err);
427 ubifs_dump_node(c, ino);
428 ubifs_dump_inode(c, inode);
433 ubifs_err("failed to read inode %lu, error %d", inode->i_ino, err);
438 static struct inode *ubifs_alloc_inode(struct super_block *sb)
440 struct ubifs_inode *ui;
442 ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS);
446 memset((void *)ui + sizeof(struct inode), 0,
447 sizeof(struct ubifs_inode) - sizeof(struct inode));
448 mutex_init(&ui->ui_mutex);
449 spin_lock_init(&ui->ui_lock);
450 return &ui->vfs_inode;
454 static void ubifs_i_callback(struct rcu_head *head)
456 struct inode *inode = container_of(head, struct inode, i_rcu);
457 struct ubifs_inode *ui = ubifs_inode(inode);
458 kmem_cache_free(ubifs_inode_slab, ui);
461 static void ubifs_destroy_inode(struct inode *inode)
463 struct ubifs_inode *ui = ubifs_inode(inode);
466 call_rcu(&inode->i_rcu, ubifs_i_callback);
470 * Note, Linux write-back code calls this without 'i_mutex'.
472 static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
475 struct ubifs_info *c = inode->i_sb->s_fs_info;
476 struct ubifs_inode *ui = ubifs_inode(inode);
478 ubifs_assert(!ui->xattr);
479 if (is_bad_inode(inode))
482 mutex_lock(&ui->ui_mutex);
484 * Due to races between write-back forced by budgeting
485 * (see 'sync_some_inodes()') and background write-back, the inode may
486 * have already been synchronized, do not do this again. This might
487 * also happen if it was synchronized in an VFS operation, e.g.
491 mutex_unlock(&ui->ui_mutex);
496 * As an optimization, do not write orphan inodes to the media just
497 * because this is not needed.
499 dbg_gen("inode %lu, mode %#x, nlink %u",
500 inode->i_ino, (int)inode->i_mode, inode->i_nlink);
501 if (inode->i_nlink) {
502 err = ubifs_jnl_write_inode(c, inode);
504 ubifs_err("can't write inode %lu, error %d",
507 err = dbg_check_inode_size(c, inode, ui->ui_size);
511 mutex_unlock(&ui->ui_mutex);
512 ubifs_release_dirty_inode_budget(c, ui);
516 static void ubifs_evict_inode(struct inode *inode)
519 struct ubifs_info *c = inode->i_sb->s_fs_info;
520 struct ubifs_inode *ui = ubifs_inode(inode);
524 * Extended attribute inode deletions are fully handled in
525 * 'ubifs_removexattr()'. These inodes are special and have
526 * limited usage, so there is nothing to do here.
530 dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
531 ubifs_assert(!atomic_read(&inode->i_count));
533 truncate_inode_pages_final(&inode->i_data);
538 if (is_bad_inode(inode))
541 ui->ui_size = inode->i_size = 0;
542 err = ubifs_jnl_delete_inode(c, inode);
545 * Worst case we have a lost orphan inode wasting space, so a
546 * simple error message is OK here.
548 ubifs_err("can't delete inode %lu, error %d",
553 ubifs_release_dirty_inode_budget(c, ui);
555 /* We've deleted something - clean the "no space" flags */
556 c->bi.nospace = c->bi.nospace_rp = 0;
564 static void ubifs_dirty_inode(struct inode *inode, int flags)
566 struct ubifs_inode *ui = ubifs_inode(inode);
568 ubifs_assert(mutex_is_locked(&ui->ui_mutex));
571 dbg_gen("inode %lu", inode->i_ino);
576 static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
578 struct ubifs_info *c = dentry->d_sb->s_fs_info;
579 unsigned long long free;
580 __le32 *uuid = (__le32 *)c->uuid;
582 free = ubifs_get_free_space(c);
583 dbg_gen("free space %lld bytes (%lld blocks)",
584 free, free >> UBIFS_BLOCK_SHIFT);
586 buf->f_type = UBIFS_SUPER_MAGIC;
587 buf->f_bsize = UBIFS_BLOCK_SIZE;
588 buf->f_blocks = c->block_cnt;
589 buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
590 if (free > c->report_rp_size)
591 buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
596 buf->f_namelen = UBIFS_MAX_NLEN;
597 buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
598 buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
599 ubifs_assert(buf->f_bfree <= c->block_cnt);
603 static int ubifs_show_options(struct seq_file *s, struct dentry *root)
605 struct ubifs_info *c = root->d_sb->s_fs_info;
607 if (c->mount_opts.unmount_mode == 2)
608 seq_printf(s, ",fast_unmount");
609 else if (c->mount_opts.unmount_mode == 1)
610 seq_printf(s, ",norm_unmount");
612 if (c->mount_opts.bulk_read == 2)
613 seq_printf(s, ",bulk_read");
614 else if (c->mount_opts.bulk_read == 1)
615 seq_printf(s, ",no_bulk_read");
617 if (c->mount_opts.chk_data_crc == 2)
618 seq_printf(s, ",chk_data_crc");
619 else if (c->mount_opts.chk_data_crc == 1)
620 seq_printf(s, ",no_chk_data_crc");
622 if (c->mount_opts.override_compr) {
623 seq_printf(s, ",compr=%s",
624 ubifs_compr_name(c->mount_opts.compr_type));
630 static int ubifs_sync_fs(struct super_block *sb, int wait)
633 struct ubifs_info *c = sb->s_fs_info;
636 * Zero @wait is just an advisory thing to help the file system shove
637 * lots of data into the queues, and there will be the second
638 * '->sync_fs()' call, with non-zero @wait.
644 * Synchronize write buffers, because 'ubifs_run_commit()' does not
645 * do this if it waits for an already running commit.
647 for (i = 0; i < c->jhead_cnt; i++) {
648 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
654 * Strictly speaking, it is not necessary to commit the journal here,
655 * synchronizing write-buffers would be enough. But committing makes
656 * UBIFS free space predictions much more accurate, so we want to let
657 * the user be able to get more accurate results of 'statfs()' after
658 * they synchronize the file system.
660 err = ubifs_run_commit(c);
664 return ubi_sync(c->vi.ubi_num);
669 * init_constants_early - initialize UBIFS constants.
670 * @c: UBIFS file-system description object
672 * This function initialize UBIFS constants which do not need the superblock to
673 * be read. It also checks that the UBI volume satisfies basic UBIFS
674 * requirements. Returns zero in case of success and a negative error code in
677 static int init_constants_early(struct ubifs_info *c)
679 if (c->vi.corrupted) {
680 ubifs_warn("UBI volume is corrupted - read-only mode");
685 ubifs_msg("read-only UBI device");
689 if (c->vi.vol_type == UBI_STATIC_VOLUME) {
690 ubifs_msg("static UBI volume - read-only mode");
694 c->leb_cnt = c->vi.size;
695 c->leb_size = c->vi.usable_leb_size;
696 c->leb_start = c->di.leb_start;
697 c->half_leb_size = c->leb_size / 2;
698 c->min_io_size = c->di.min_io_size;
699 c->min_io_shift = fls(c->min_io_size) - 1;
700 c->max_write_size = c->di.max_write_size;
701 c->max_write_shift = fls(c->max_write_size) - 1;
703 if (c->leb_size < UBIFS_MIN_LEB_SZ) {
704 ubifs_err("too small LEBs (%d bytes), min. is %d bytes",
705 c->leb_size, UBIFS_MIN_LEB_SZ);
709 if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
710 ubifs_err("too few LEBs (%d), min. is %d",
711 c->leb_cnt, UBIFS_MIN_LEB_CNT);
715 if (!is_power_of_2(c->min_io_size)) {
716 ubifs_err("bad min. I/O size %d", c->min_io_size);
721 * Maximum write size has to be greater or equivalent to min. I/O
722 * size, and be multiple of min. I/O size.
724 if (c->max_write_size < c->min_io_size ||
725 c->max_write_size % c->min_io_size ||
726 !is_power_of_2(c->max_write_size)) {
727 ubifs_err("bad write buffer size %d for %d min. I/O unit",
728 c->max_write_size, c->min_io_size);
733 * UBIFS aligns all node to 8-byte boundary, so to make function in
734 * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
737 if (c->min_io_size < 8) {
740 if (c->max_write_size < c->min_io_size) {
741 c->max_write_size = c->min_io_size;
742 c->max_write_shift = c->min_io_shift;
746 c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
747 c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size);
750 * Initialize node length ranges which are mostly needed for node
753 c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ;
754 c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ;
755 c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ;
756 c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
757 c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
758 c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
760 c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
761 c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
762 c->ranges[UBIFS_ORPH_NODE].min_len =
763 UBIFS_ORPH_NODE_SZ + sizeof(__le64);
764 c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size;
765 c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ;
766 c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ;
767 c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ;
768 c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ;
769 c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ;
770 c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ;
772 * Minimum indexing node size is amended later when superblock is
773 * read and the key length is known.
775 c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ;
777 * Maximum indexing node size is amended later when superblock is
778 * read and the fanout is known.
780 c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX;
783 * Initialize dead and dark LEB space watermarks. See gc.c for comments
784 * about these values.
786 c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
787 c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
790 * Calculate how many bytes would be wasted at the end of LEB if it was
791 * fully filled with data nodes of maximum size. This is used in
792 * calculations when reporting free space.
794 c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
796 /* Buffer size for bulk-reads */
797 c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
798 if (c->max_bu_buf_len > c->leb_size)
799 c->max_bu_buf_len = c->leb_size;
804 * bud_wbuf_callback - bud LEB write-buffer synchronization call-back.
805 * @c: UBIFS file-system description object
806 * @lnum: LEB the write-buffer was synchronized to
807 * @free: how many free bytes left in this LEB
808 * @pad: how many bytes were padded
810 * This is a callback function which is called by the I/O unit when the
811 * write-buffer is synchronized. We need this to correctly maintain space
812 * accounting in bud logical eraseblocks. This function returns zero in case of
813 * success and a negative error code in case of failure.
815 * This function actually belongs to the journal, but we keep it here because
816 * we want to keep it static.
818 static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
820 return ubifs_update_one_lp(c, lnum, free, pad, 0, 0);
824 * init_constants_sb - initialize UBIFS constants.
825 * @c: UBIFS file-system description object
827 * This is a helper function which initializes various UBIFS constants after
828 * the superblock has been read. It also checks various UBIFS parameters and
829 * makes sure they are all right. Returns zero in case of success and a
830 * negative error code in case of failure.
832 static int init_constants_sb(struct ubifs_info *c)
837 c->main_bytes = (long long)c->main_lebs * c->leb_size;
838 c->max_znode_sz = sizeof(struct ubifs_znode) +
839 c->fanout * sizeof(struct ubifs_zbranch);
841 tmp = ubifs_idx_node_sz(c, 1);
842 c->ranges[UBIFS_IDX_NODE].min_len = tmp;
843 c->min_idx_node_sz = ALIGN(tmp, 8);
845 tmp = ubifs_idx_node_sz(c, c->fanout);
846 c->ranges[UBIFS_IDX_NODE].max_len = tmp;
847 c->max_idx_node_sz = ALIGN(tmp, 8);
849 /* Make sure LEB size is large enough to fit full commit */
850 tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt;
851 tmp = ALIGN(tmp, c->min_io_size);
852 if (tmp > c->leb_size) {
853 ubifs_err("too small LEB size %d, at least %d needed",
859 * Make sure that the log is large enough to fit reference nodes for
860 * all buds plus one reserved LEB.
862 tmp64 = c->max_bud_bytes + c->leb_size - 1;
863 c->max_bud_cnt = div_u64(tmp64, c->leb_size);
864 tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
867 if (c->log_lebs < tmp) {
868 ubifs_err("too small log %d LEBs, required min. %d LEBs",
874 * When budgeting we assume worst-case scenarios when the pages are not
875 * be compressed and direntries are of the maximum size.
877 * Note, data, which may be stored in inodes is budgeted separately, so
878 * it is not included into 'c->bi.inode_budget'.
880 c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE;
881 c->bi.inode_budget = UBIFS_INO_NODE_SZ;
882 c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ;
885 * When the amount of flash space used by buds becomes
886 * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit.
887 * The writers are unblocked when the commit is finished. To avoid
888 * writers to be blocked UBIFS initiates background commit in advance,
889 * when number of bud bytes becomes above the limit defined below.
891 c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4;
894 * Ensure minimum journal size. All the bytes in the journal heads are
895 * considered to be used, when calculating the current journal usage.
896 * Consequently, if the journal is too small, UBIFS will treat it as
899 tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
900 if (c->bg_bud_bytes < tmp64)
901 c->bg_bud_bytes = tmp64;
902 if (c->max_bud_bytes < tmp64 + c->leb_size)
903 c->max_bud_bytes = tmp64 + c->leb_size;
905 err = ubifs_calc_lpt_geom(c);
909 /* Initialize effective LEB size used in budgeting calculations */
910 c->idx_leb_size = c->leb_size - c->max_idx_node_sz;
915 * init_constants_master - initialize UBIFS constants.
916 * @c: UBIFS file-system description object
918 * This is a helper function which initializes various UBIFS constants after
919 * the master node has been read. It also checks various UBIFS parameters and
920 * makes sure they are all right.
922 static void init_constants_master(struct ubifs_info *c)
926 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
927 c->report_rp_size = ubifs_reported_space(c, c->rp_size);
930 * Calculate total amount of FS blocks. This number is not used
931 * internally because it does not make much sense for UBIFS, but it is
932 * necessary to report something for the 'statfs()' call.
934 * Subtract the LEB reserved for GC, the LEB which is reserved for
935 * deletions, minimum LEBs for the index, and assume only one journal
938 tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
939 tmp64 *= (long long)c->leb_size - c->leb_overhead;
940 tmp64 = ubifs_reported_space(c, tmp64);
941 c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
945 * take_gc_lnum - reserve GC LEB.
946 * @c: UBIFS file-system description object
948 * This function ensures that the LEB reserved for garbage collection is marked
949 * as "taken" in lprops. We also have to set free space to LEB size and dirty
950 * space to zero, because lprops may contain out-of-date information if the
951 * file-system was un-mounted before it has been committed. This function
952 * returns zero in case of success and a negative error code in case of
955 static int take_gc_lnum(struct ubifs_info *c)
959 if (c->gc_lnum == -1) {
960 ubifs_err("no LEB for GC");
964 /* And we have to tell lprops that this LEB is taken */
965 err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0,
971 * alloc_wbufs - allocate write-buffers.
972 * @c: UBIFS file-system description object
974 * This helper function allocates and initializes UBIFS write-buffers. Returns
975 * zero in case of success and %-ENOMEM in case of failure.
977 static int alloc_wbufs(struct ubifs_info *c)
981 c->jheads = kzalloc(c->jhead_cnt * sizeof(struct ubifs_jhead),
986 /* Initialize journal heads */
987 for (i = 0; i < c->jhead_cnt; i++) {
988 INIT_LIST_HEAD(&c->jheads[i].buds_list);
989 err = ubifs_wbuf_init(c, &c->jheads[i].wbuf);
993 c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback;
994 c->jheads[i].wbuf.jhead = i;
995 c->jheads[i].grouped = 1;
999 * Garbage Collector head does not need to be synchronized by timer.
1000 * Also GC head nodes are not grouped.
1002 c->jheads[GCHD].wbuf.no_timer = 1;
1003 c->jheads[GCHD].grouped = 0;
1009 * free_wbufs - free write-buffers.
1010 * @c: UBIFS file-system description object
1012 static void free_wbufs(struct ubifs_info *c)
1017 for (i = 0; i < c->jhead_cnt; i++) {
1018 kfree(c->jheads[i].wbuf.buf);
1019 kfree(c->jheads[i].wbuf.inodes);
1027 * free_orphans - free orphans.
1028 * @c: UBIFS file-system description object
1030 static void free_orphans(struct ubifs_info *c)
1032 struct ubifs_orphan *orph;
1034 while (c->orph_dnext) {
1035 orph = c->orph_dnext;
1036 c->orph_dnext = orph->dnext;
1037 list_del(&orph->list);
1041 while (!list_empty(&c->orph_list)) {
1042 orph = list_entry(c->orph_list.next, struct ubifs_orphan, list);
1043 list_del(&orph->list);
1045 ubifs_err("orphan list not empty at unmount");
1053 * free_buds - free per-bud objects.
1054 * @c: UBIFS file-system description object
1056 static void free_buds(struct ubifs_info *c)
1058 struct ubifs_bud *bud, *n;
1060 rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb)
1065 * check_volume_empty - check if the UBI volume is empty.
1066 * @c: UBIFS file-system description object
1068 * This function checks if the UBIFS volume is empty by looking if its LEBs are
1069 * mapped or not. The result of checking is stored in the @c->empty variable.
1070 * Returns zero in case of success and a negative error code in case of
1073 static int check_volume_empty(struct ubifs_info *c)
1078 for (lnum = 0; lnum < c->leb_cnt; lnum++) {
1079 err = ubifs_is_mapped(c, lnum);
1080 if (unlikely(err < 0))
1094 * UBIFS mount options.
1096 * Opt_fast_unmount: do not run a journal commit before un-mounting
1097 * Opt_norm_unmount: run a journal commit before un-mounting
1098 * Opt_bulk_read: enable bulk-reads
1099 * Opt_no_bulk_read: disable bulk-reads
1100 * Opt_chk_data_crc: check CRCs when reading data nodes
1101 * Opt_no_chk_data_crc: do not check CRCs when reading data nodes
1102 * Opt_override_compr: override default compressor
1103 * Opt_err: just end of array marker
1111 Opt_no_chk_data_crc,
1117 static const match_table_t tokens = {
1118 {Opt_fast_unmount, "fast_unmount"},
1119 {Opt_norm_unmount, "norm_unmount"},
1120 {Opt_bulk_read, "bulk_read"},
1121 {Opt_no_bulk_read, "no_bulk_read"},
1122 {Opt_chk_data_crc, "chk_data_crc"},
1123 {Opt_no_chk_data_crc, "no_chk_data_crc"},
1124 {Opt_override_compr, "compr=%s"},
1129 * parse_standard_option - parse a standard mount option.
1130 * @option: the option to parse
1132 * Normally, standard mount options like "sync" are passed to file-systems as
1133 * flags. However, when a "rootflags=" kernel boot parameter is used, they may
1134 * be present in the options string. This function tries to deal with this
1135 * situation and parse standard options. Returns 0 if the option was not
1136 * recognized, and the corresponding integer flag if it was.
1138 * UBIFS is only interested in the "sync" option, so do not check for anything
1141 static int parse_standard_option(const char *option)
1143 ubifs_msg("parse %s", option);
1144 if (!strcmp(option, "sync"))
1145 return MS_SYNCHRONOUS;
1150 * ubifs_parse_options - parse mount parameters.
1151 * @c: UBIFS file-system description object
1152 * @options: parameters to parse
1153 * @is_remount: non-zero if this is FS re-mount
1155 * This function parses UBIFS mount options and returns zero in case success
1156 * and a negative error code in case of failure.
1158 static int ubifs_parse_options(struct ubifs_info *c, char *options,
1162 substring_t args[MAX_OPT_ARGS];
1167 while ((p = strsep(&options, ","))) {
1173 token = match_token(p, tokens, args);
1176 * %Opt_fast_unmount and %Opt_norm_unmount options are ignored.
1177 * We accept them in order to be backward-compatible. But this
1178 * should be removed at some point.
1180 case Opt_fast_unmount:
1181 c->mount_opts.unmount_mode = 2;
1183 case Opt_norm_unmount:
1184 c->mount_opts.unmount_mode = 1;
1187 c->mount_opts.bulk_read = 2;
1190 case Opt_no_bulk_read:
1191 c->mount_opts.bulk_read = 1;
1194 case Opt_chk_data_crc:
1195 c->mount_opts.chk_data_crc = 2;
1196 c->no_chk_data_crc = 0;
1198 case Opt_no_chk_data_crc:
1199 c->mount_opts.chk_data_crc = 1;
1200 c->no_chk_data_crc = 1;
1202 case Opt_override_compr:
1204 char *name = match_strdup(&args[0]);
1208 if (!strcmp(name, "none"))
1209 c->mount_opts.compr_type = UBIFS_COMPR_NONE;
1210 else if (!strcmp(name, "lzo"))
1211 c->mount_opts.compr_type = UBIFS_COMPR_LZO;
1212 else if (!strcmp(name, "zlib"))
1213 c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
1215 ubifs_err("unknown compressor \"%s\"", name);
1220 c->mount_opts.override_compr = 1;
1221 c->default_compr = c->mount_opts.compr_type;
1227 struct super_block *sb = c->vfs_sb;
1229 flag = parse_standard_option(p);
1231 ubifs_err("unrecognized mount option \"%s\" or missing value",
1235 sb->s_flags |= flag;
1246 * destroy_journal - destroy journal data structures.
1247 * @c: UBIFS file-system description object
1249 * This function destroys journal data structures including those that may have
1250 * been created by recovery functions.
1252 static void destroy_journal(struct ubifs_info *c)
1254 while (!list_empty(&c->unclean_leb_list)) {
1255 struct ubifs_unclean_leb *ucleb;
1257 ucleb = list_entry(c->unclean_leb_list.next,
1258 struct ubifs_unclean_leb, list);
1259 list_del(&ucleb->list);
1262 while (!list_empty(&c->old_buds)) {
1263 struct ubifs_bud *bud;
1265 bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
1266 list_del(&bud->list);
1269 ubifs_destroy_idx_gc(c);
1270 ubifs_destroy_size_tree(c);
1276 * bu_init - initialize bulk-read information.
1277 * @c: UBIFS file-system description object
1279 static void bu_init(struct ubifs_info *c)
1281 ubifs_assert(c->bulk_read == 1);
1284 return; /* Already initialized */
1287 c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
1289 if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
1290 c->max_bu_buf_len = UBIFS_KMALLOC_OK;
1294 /* Just disable bulk-read */
1295 ubifs_warn("cannot allocate %d bytes of memory for bulk-read, disabling it",
1297 c->mount_opts.bulk_read = 1;
1305 * check_free_space - check if there is enough free space to mount.
1306 * @c: UBIFS file-system description object
1308 * This function makes sure UBIFS has enough free space to be mounted in
1309 * read/write mode. UBIFS must always have some free space to allow deletions.
1311 static int check_free_space(struct ubifs_info *c)
1313 ubifs_assert(c->dark_wm > 0);
1314 if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {
1315 ubifs_err("insufficient free space to mount in R/W mode");
1316 ubifs_dump_budg(c, &c->bi);
1317 ubifs_dump_lprops(c);
1325 * mount_ubifs - mount UBIFS file-system.
1326 * @c: UBIFS file-system description object
1328 * This function mounts UBIFS file system. Returns zero in case of success and
1329 * a negative error code in case of failure.
1331 static int mount_ubifs(struct ubifs_info *c)
1337 c->ro_mount = !!(c->vfs_sb->s_flags & MS_RDONLY);
1340 printf("UBIFS: only ro mode in U-Boot allowed.\n");
1345 err = init_constants_early(c);
1349 err = ubifs_debugging_init(c);
1353 err = check_volume_empty(c);
1357 if (c->empty && (c->ro_mount || c->ro_media)) {
1359 * This UBI volume is empty, and read-only, or the file system
1360 * is mounted read-only - we cannot format it.
1362 ubifs_err("can't format empty UBI volume: read-only %s",
1363 c->ro_media ? "UBI volume" : "mount");
1368 if (c->ro_media && !c->ro_mount) {
1369 ubifs_err("cannot mount read-write - read-only media");
1375 * The requirement for the buffer is that it should fit indexing B-tree
1376 * height amount of integers. We assume the height if the TNC tree will
1380 c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL);
1381 if (!c->bottom_up_buf)
1384 c->sbuf = vmalloc(c->leb_size);
1390 c->ileb_buf = vmalloc(c->leb_size);
1396 if (c->bulk_read == 1)
1401 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ,
1403 if (!c->write_reserve_buf)
1410 err = ubifs_read_superblock(c);
1415 * Make sure the compressor which is set as default in the superblock
1416 * or overridden by mount options is actually compiled in.
1418 if (!ubifs_compr_present(c->default_compr)) {
1419 ubifs_err("'compressor \"%s\" is not compiled in",
1420 ubifs_compr_name(c->default_compr));
1425 err = init_constants_sb(c);
1429 sz = ALIGN(c->max_idx_node_sz, c->min_io_size);
1430 sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size);
1431 c->cbuf = kmalloc(sz, GFP_NOFS);
1437 err = alloc_wbufs(c);
1441 sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
1444 /* Create background thread */
1445 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1446 if (IS_ERR(c->bgt)) {
1447 err = PTR_ERR(c->bgt);
1449 ubifs_err("cannot spawn \"%s\", error %d",
1453 wake_up_process(c->bgt);
1457 err = ubifs_read_master(c);
1461 init_constants_master(c);
1463 if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
1464 ubifs_msg("recovery needed");
1465 c->need_recovery = 1;
1469 if (c->need_recovery && !c->ro_mount) {
1470 err = ubifs_recover_inl_heads(c, c->sbuf);
1476 err = ubifs_lpt_init(c, 1, !c->ro_mount);
1481 if (!c->ro_mount && c->space_fixup) {
1482 err = ubifs_fixup_free_space(c);
1489 * Set the "dirty" flag so that if we reboot uncleanly we
1490 * will notice this immediately on the next mount.
1492 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1493 err = ubifs_write_master(c);
1499 err = dbg_check_idx_size(c, c->bi.old_idx_sz);
1503 err = ubifs_replay_journal(c);
1507 /* Calculate 'min_idx_lebs' after journal replay */
1508 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
1510 err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount);
1518 err = check_free_space(c);
1522 /* Check for enough log space */
1523 lnum = c->lhead_lnum + 1;
1524 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1525 lnum = UBIFS_LOG_LNUM;
1526 if (lnum == c->ltail_lnum) {
1527 err = ubifs_consolidate_log(c);
1532 if (c->need_recovery) {
1533 err = ubifs_recover_size(c);
1536 err = ubifs_rcvry_gc_commit(c);
1540 err = take_gc_lnum(c);
1545 * GC LEB may contain garbage if there was an unclean
1546 * reboot, and it should be un-mapped.
1548 err = ubifs_leb_unmap(c, c->gc_lnum);
1553 err = dbg_check_lprops(c);
1557 } else if (c->need_recovery) {
1558 err = ubifs_recover_size(c);
1563 * Even if we mount read-only, we have to set space in GC LEB
1564 * to proper value because this affects UBIFS free space
1565 * reporting. We do not want to have a situation when
1566 * re-mounting from R/O to R/W changes amount of free space.
1568 err = take_gc_lnum(c);
1574 spin_lock(&ubifs_infos_lock);
1575 list_add_tail(&c->infos_list, &ubifs_infos);
1576 spin_unlock(&ubifs_infos_lock);
1579 if (c->need_recovery) {
1581 ubifs_msg("recovery deferred");
1583 c->need_recovery = 0;
1584 ubifs_msg("recovery completed");
1586 * GC LEB has to be empty and taken at this point. But
1587 * the journal head LEBs may also be accounted as
1588 * "empty taken" if they are empty.
1590 ubifs_assert(c->lst.taken_empty_lebs > 0);
1593 ubifs_assert(c->lst.taken_empty_lebs > 0);
1595 err = dbg_check_filesystem(c);
1599 err = dbg_debugfs_init_fs(c);
1605 ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"%s",
1606 c->vi.ubi_num, c->vi.vol_id, c->vi.name,
1607 c->ro_mount ? ", R/O mode" : "");
1608 x = (long long)c->main_lebs * c->leb_size;
1609 y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
1610 ubifs_msg("LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
1611 c->leb_size, c->leb_size >> 10, c->min_io_size,
1613 ubifs_msg("FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)",
1614 x, x >> 20, c->main_lebs,
1615 y, y >> 20, c->log_lebs + c->max_bud_cnt);
1616 ubifs_msg("reserved for root: %llu bytes (%llu KiB)",
1617 c->report_rp_size, c->report_rp_size >> 10);
1618 ubifs_msg("media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
1619 c->fmt_version, c->ro_compat_version,
1620 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid,
1621 c->big_lpt ? ", big LPT model" : ", small LPT model");
1623 dbg_gen("default compressor: %s", ubifs_compr_name(c->default_compr));
1624 dbg_gen("data journal heads: %d",
1625 c->jhead_cnt - NONDATA_JHEADS_CNT);
1626 dbg_gen("log LEBs: %d (%d - %d)",
1627 c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
1628 dbg_gen("LPT area LEBs: %d (%d - %d)",
1629 c->lpt_lebs, c->lpt_first, c->lpt_last);
1630 dbg_gen("orphan area LEBs: %d (%d - %d)",
1631 c->orph_lebs, c->orph_first, c->orph_last);
1632 dbg_gen("main area LEBs: %d (%d - %d)",
1633 c->main_lebs, c->main_first, c->leb_cnt - 1);
1634 dbg_gen("index LEBs: %d", c->lst.idx_lebs);
1635 dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)",
1636 c->bi.old_idx_sz, c->bi.old_idx_sz >> 10,
1637 c->bi.old_idx_sz >> 20);
1638 dbg_gen("key hash type: %d", c->key_hash_type);
1639 dbg_gen("tree fanout: %d", c->fanout);
1640 dbg_gen("reserved GC LEB: %d", c->gc_lnum);
1641 dbg_gen("max. znode size %d", c->max_znode_sz);
1642 dbg_gen("max. index node size %d", c->max_idx_node_sz);
1643 dbg_gen("node sizes: data %zu, inode %zu, dentry %zu",
1644 UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
1645 dbg_gen("node sizes: trun %zu, sb %zu, master %zu",
1646 UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
1647 dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu",
1648 UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
1649 dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
1650 UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
1651 UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout));
1652 dbg_gen("dead watermark: %d", c->dead_wm);
1653 dbg_gen("dark watermark: %d", c->dark_wm);
1654 dbg_gen("LEB overhead: %d", c->leb_overhead);
1655 x = (long long)c->main_lebs * c->dark_wm;
1656 dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)",
1657 x, x >> 10, x >> 20);
1658 dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
1659 c->max_bud_bytes, c->max_bud_bytes >> 10,
1660 c->max_bud_bytes >> 20);
1661 dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
1662 c->bg_bud_bytes, c->bg_bud_bytes >> 10,
1663 c->bg_bud_bytes >> 20);
1664 dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)",
1665 c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
1666 dbg_gen("max. seq. number: %llu", c->max_sqnum);
1667 dbg_gen("commit number: %llu", c->cmt_no);
1672 spin_lock(&ubifs_infos_lock);
1673 list_del(&c->infos_list);
1674 spin_unlock(&ubifs_infos_lock);
1680 ubifs_lpt_free(c, 0);
1683 kfree(c->rcvrd_mst_node);
1685 kthread_stop(c->bgt);
1693 kfree(c->write_reserve_buf);
1697 kfree(c->bottom_up_buf);
1698 ubifs_debugging_exit(c);
1703 * ubifs_umount - un-mount UBIFS file-system.
1704 * @c: UBIFS file-system description object
1706 * Note, this function is called to free allocated resourced when un-mounting,
1707 * as well as free resources when an error occurred while we were half way
1708 * through mounting (error path cleanup function). So it has to make sure the
1709 * resource was actually allocated before freeing it.
1712 static void ubifs_umount(struct ubifs_info *c)
1714 void ubifs_umount(struct ubifs_info *c)
1717 dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
1720 dbg_debugfs_exit_fs(c);
1721 spin_lock(&ubifs_infos_lock);
1722 list_del(&c->infos_list);
1723 spin_unlock(&ubifs_infos_lock);
1727 kthread_stop(c->bgt);
1733 ubifs_lpt_free(c, 0);
1736 kfree(c->rcvrd_mst_node);
1738 kfree(c->write_reserve_buf);
1742 kfree(c->bottom_up_buf);
1743 ubifs_debugging_exit(c);
1745 /* Finally free U-Boot's global copy of superblock */
1746 if (ubifs_sb != NULL) {
1747 free(ubifs_sb->s_fs_info);
1755 * ubifs_remount_rw - re-mount in read-write mode.
1756 * @c: UBIFS file-system description object
1758 * UBIFS avoids allocating many unnecessary resources when mounted in read-only
1759 * mode. This function allocates the needed resources and re-mounts UBIFS in
1762 static int ubifs_remount_rw(struct ubifs_info *c)
1766 if (c->rw_incompat) {
1767 ubifs_err("the file-system is not R/W-compatible");
1768 ubifs_msg("on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
1769 c->fmt_version, c->ro_compat_version,
1770 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
1774 mutex_lock(&c->umount_mutex);
1775 dbg_save_space_info(c);
1776 c->remounting_rw = 1;
1779 if (c->space_fixup) {
1780 err = ubifs_fixup_free_space(c);
1785 err = check_free_space(c);
1789 if (c->old_leb_cnt != c->leb_cnt) {
1790 struct ubifs_sb_node *sup;
1792 sup = ubifs_read_sb_node(c);
1797 sup->leb_cnt = cpu_to_le32(c->leb_cnt);
1798 err = ubifs_write_sb_node(c, sup);
1804 if (c->need_recovery) {
1805 ubifs_msg("completing deferred recovery");
1806 err = ubifs_write_rcvrd_mst_node(c);
1809 err = ubifs_recover_size(c);
1812 err = ubifs_clean_lebs(c, c->sbuf);
1815 err = ubifs_recover_inl_heads(c, c->sbuf);
1819 /* A readonly mount is not allowed to have orphans */
1820 ubifs_assert(c->tot_orphans == 0);
1821 err = ubifs_clear_orphans(c);
1826 if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) {
1827 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1828 err = ubifs_write_master(c);
1833 c->ileb_buf = vmalloc(c->leb_size);
1839 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ, GFP_KERNEL);
1840 if (!c->write_reserve_buf) {
1845 err = ubifs_lpt_init(c, 0, 1);
1849 /* Create background thread */
1850 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1851 if (IS_ERR(c->bgt)) {
1852 err = PTR_ERR(c->bgt);
1854 ubifs_err("cannot spawn \"%s\", error %d",
1858 wake_up_process(c->bgt);
1860 c->orph_buf = vmalloc(c->leb_size);
1866 /* Check for enough log space */
1867 lnum = c->lhead_lnum + 1;
1868 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1869 lnum = UBIFS_LOG_LNUM;
1870 if (lnum == c->ltail_lnum) {
1871 err = ubifs_consolidate_log(c);
1876 if (c->need_recovery)
1877 err = ubifs_rcvry_gc_commit(c);
1879 err = ubifs_leb_unmap(c, c->gc_lnum);
1883 dbg_gen("re-mounted read-write");
1884 c->remounting_rw = 0;
1886 if (c->need_recovery) {
1887 c->need_recovery = 0;
1888 ubifs_msg("deferred recovery completed");
1891 * Do not run the debugging space check if the were doing
1892 * recovery, because when we saved the information we had the
1893 * file-system in a state where the TNC and lprops has been
1894 * modified in memory, but all the I/O operations (including a
1895 * commit) were deferred. So the file-system was in
1896 * "non-committed" state. Now the file-system is in committed
1897 * state, and of course the amount of free space will change
1898 * because, for example, the old index size was imprecise.
1900 err = dbg_check_space_info(c);
1903 mutex_unlock(&c->umount_mutex);
1911 kthread_stop(c->bgt);
1915 kfree(c->write_reserve_buf);
1916 c->write_reserve_buf = NULL;
1919 ubifs_lpt_free(c, 1);
1920 c->remounting_rw = 0;
1921 mutex_unlock(&c->umount_mutex);
1926 * ubifs_remount_ro - re-mount in read-only mode.
1927 * @c: UBIFS file-system description object
1929 * We assume VFS has stopped writing. Possibly the background thread could be
1930 * running a commit, however kthread_stop will wait in that case.
1932 static void ubifs_remount_ro(struct ubifs_info *c)
1936 ubifs_assert(!c->need_recovery);
1937 ubifs_assert(!c->ro_mount);
1939 mutex_lock(&c->umount_mutex);
1941 kthread_stop(c->bgt);
1945 dbg_save_space_info(c);
1947 for (i = 0; i < c->jhead_cnt; i++)
1948 ubifs_wbuf_sync(&c->jheads[i].wbuf);
1950 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1951 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1952 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1953 err = ubifs_write_master(c);
1955 ubifs_ro_mode(c, err);
1959 kfree(c->write_reserve_buf);
1960 c->write_reserve_buf = NULL;
1963 ubifs_lpt_free(c, 1);
1965 err = dbg_check_space_info(c);
1967 ubifs_ro_mode(c, err);
1968 mutex_unlock(&c->umount_mutex);
1971 static void ubifs_put_super(struct super_block *sb)
1974 struct ubifs_info *c = sb->s_fs_info;
1976 ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num,
1980 * The following asserts are only valid if there has not been a failure
1981 * of the media. For example, there will be dirty inodes if we failed
1982 * to write them back because of I/O errors.
1985 ubifs_assert(c->bi.idx_growth == 0);
1986 ubifs_assert(c->bi.dd_growth == 0);
1987 ubifs_assert(c->bi.data_growth == 0);
1991 * The 'c->umount_lock' prevents races between UBIFS memory shrinker
1992 * and file system un-mount. Namely, it prevents the shrinker from
1993 * picking this superblock for shrinking - it will be just skipped if
1994 * the mutex is locked.
1996 mutex_lock(&c->umount_mutex);
1999 * First of all kill the background thread to make sure it does
2000 * not interfere with un-mounting and freeing resources.
2003 kthread_stop(c->bgt);
2008 * On fatal errors c->ro_error is set to 1, in which case we do
2009 * not write the master node.
2014 /* Synchronize write-buffers */
2015 for (i = 0; i < c->jhead_cnt; i++)
2016 ubifs_wbuf_sync(&c->jheads[i].wbuf);
2019 * We are being cleanly unmounted which means the
2020 * orphans were killed - indicate this in the master
2021 * node. Also save the reserved GC LEB number.
2023 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
2024 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
2025 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
2026 err = ubifs_write_master(c);
2029 * Recovery will attempt to fix the master area
2030 * next mount, so we just print a message and
2031 * continue to unmount normally.
2033 ubifs_err("failed to write master node, error %d",
2037 for (i = 0; i < c->jhead_cnt; i++)
2038 /* Make sure write-buffer timers are canceled */
2039 hrtimer_cancel(&c->jheads[i].wbuf.timer);
2046 bdi_destroy(&c->bdi);
2048 ubi_close_volume(c->ubi);
2049 mutex_unlock(&c->umount_mutex);
2054 static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
2057 struct ubifs_info *c = sb->s_fs_info;
2059 sync_filesystem(sb);
2060 dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags);
2062 err = ubifs_parse_options(c, data, 1);
2064 ubifs_err("invalid or unknown remount parameter");
2068 if (c->ro_mount && !(*flags & MS_RDONLY)) {
2070 ubifs_msg("cannot re-mount R/W due to prior errors");
2074 ubifs_msg("cannot re-mount R/W - UBI volume is R/O");
2077 err = ubifs_remount_rw(c);
2080 } else if (!c->ro_mount && (*flags & MS_RDONLY)) {
2082 ubifs_msg("cannot re-mount R/O due to prior errors");
2085 ubifs_remount_ro(c);
2088 if (c->bulk_read == 1)
2091 dbg_gen("disable bulk-read");
2096 ubifs_assert(c->lst.taken_empty_lebs > 0);
2101 const struct super_operations ubifs_super_operations = {
2102 .alloc_inode = ubifs_alloc_inode,
2104 .destroy_inode = ubifs_destroy_inode,
2105 .put_super = ubifs_put_super,
2106 .write_inode = ubifs_write_inode,
2107 .evict_inode = ubifs_evict_inode,
2108 .statfs = ubifs_statfs,
2110 .dirty_inode = ubifs_dirty_inode,
2112 .remount_fs = ubifs_remount_fs,
2113 .show_options = ubifs_show_options,
2114 .sync_fs = ubifs_sync_fs,
2119 * open_ubi - parse UBI device name string and open the UBI device.
2120 * @name: UBI volume name
2121 * @mode: UBI volume open mode
2123 * The primary method of mounting UBIFS is by specifying the UBI volume
2124 * character device node path. However, UBIFS may also be mounted withoug any
2125 * character device node using one of the following methods:
2127 * o ubiX_Y - mount UBI device number X, volume Y;
2128 * o ubiY - mount UBI device number 0, volume Y;
2129 * o ubiX:NAME - mount UBI device X, volume with name NAME;
2130 * o ubi:NAME - mount UBI device 0, volume with name NAME.
2132 * Alternative '!' separator may be used instead of ':' (because some shells
2133 * like busybox may interpret ':' as an NFS host name separator). This function
2134 * returns UBI volume description object in case of success and a negative
2135 * error code in case of failure.
2137 static struct ubi_volume_desc *open_ubi(const char *name, int mode)
2140 struct ubi_volume_desc *ubi;
2146 /* First, try to open using the device node path method */
2147 ubi = ubi_open_volume_path(name, mode);
2152 /* Try the "nodev" method */
2153 if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
2154 return ERR_PTR(-EINVAL);
2156 /* ubi:NAME method */
2157 if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
2158 return ubi_open_volume_nm(0, name + 4, mode);
2160 if (!isdigit(name[3]))
2161 return ERR_PTR(-EINVAL);
2163 dev = simple_strtoul(name + 3, &endptr, 0);
2166 if (*endptr == '\0')
2167 return ubi_open_volume(0, dev, mode);
2170 if (*endptr == '_' && isdigit(endptr[1])) {
2171 vol = simple_strtoul(endptr + 1, &endptr, 0);
2172 if (*endptr != '\0')
2173 return ERR_PTR(-EINVAL);
2174 return ubi_open_volume(dev, vol, mode);
2177 /* ubiX:NAME method */
2178 if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
2179 return ubi_open_volume_nm(dev, ++endptr, mode);
2181 return ERR_PTR(-EINVAL);
2184 static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
2186 struct ubifs_info *c;
2188 c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
2190 spin_lock_init(&c->cnt_lock);
2191 spin_lock_init(&c->cs_lock);
2192 spin_lock_init(&c->buds_lock);
2193 spin_lock_init(&c->space_lock);
2194 spin_lock_init(&c->orphan_lock);
2195 init_rwsem(&c->commit_sem);
2196 mutex_init(&c->lp_mutex);
2197 mutex_init(&c->tnc_mutex);
2198 mutex_init(&c->log_mutex);
2199 mutex_init(&c->mst_mutex);
2200 mutex_init(&c->umount_mutex);
2201 mutex_init(&c->bu_mutex);
2202 mutex_init(&c->write_reserve_mutex);
2203 init_waitqueue_head(&c->cmt_wq);
2205 c->old_idx = RB_ROOT;
2206 c->size_tree = RB_ROOT;
2207 c->orph_tree = RB_ROOT;
2208 INIT_LIST_HEAD(&c->infos_list);
2209 INIT_LIST_HEAD(&c->idx_gc);
2210 INIT_LIST_HEAD(&c->replay_list);
2211 INIT_LIST_HEAD(&c->replay_buds);
2212 INIT_LIST_HEAD(&c->uncat_list);
2213 INIT_LIST_HEAD(&c->empty_list);
2214 INIT_LIST_HEAD(&c->freeable_list);
2215 INIT_LIST_HEAD(&c->frdi_idx_list);
2216 INIT_LIST_HEAD(&c->unclean_leb_list);
2217 INIT_LIST_HEAD(&c->old_buds);
2218 INIT_LIST_HEAD(&c->orph_list);
2219 INIT_LIST_HEAD(&c->orph_new);
2220 c->no_chk_data_crc = 1;
2222 c->highest_inum = UBIFS_FIRST_INO;
2223 c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
2225 ubi_get_volume_info(ubi, &c->vi);
2226 ubi_get_device_info(c->vi.ubi_num, &c->di);
2231 static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
2233 struct ubifs_info *c = sb->s_fs_info;
2239 /* Re-open the UBI device in read-write mode */
2240 c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
2242 /* U-Boot read only mode */
2243 c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
2246 if (IS_ERR(c->ubi)) {
2247 err = PTR_ERR(c->ubi);
2253 * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For
2254 * UBIFS, I/O is not deferred, it is done immediately in readpage,
2255 * which means the user would have to wait not just for their own I/O
2256 * but the read-ahead I/O as well i.e. completely pointless.
2258 * Read-ahead will be disabled because @c->bdi.ra_pages is 0.
2260 co>bdi.name = "ubifs",
2261 c->bdi.capabilities = BDI_CAP_MAP_COPY;
2262 err = bdi_init(&c->bdi);
2265 err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d",
2266 c->vi.ubi_num, c->vi.vol_id);
2270 err = ubifs_parse_options(c, data, 0);
2274 sb->s_bdi = &c->bdi;
2277 sb->s_magic = UBIFS_SUPER_MAGIC;
2278 sb->s_blocksize = UBIFS_BLOCK_SIZE;
2279 sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
2280 sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
2281 if (c->max_inode_sz > MAX_LFS_FILESIZE)
2282 sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
2283 sb->s_op = &ubifs_super_operations;
2285 mutex_lock(&c->umount_mutex);
2286 err = mount_ubifs(c);
2288 ubifs_assert(err < 0);
2292 /* Read the root inode */
2293 root = ubifs_iget(sb, UBIFS_ROOT_INO);
2295 err = PTR_ERR(root);
2300 sb->s_root = d_make_root(root);
2309 mutex_unlock(&c->umount_mutex);
2315 mutex_unlock(&c->umount_mutex);
2318 bdi_destroy(&c->bdi);
2321 ubi_close_volume(c->ubi);
2326 static int sb_test(struct super_block *sb, void *data)
2328 struct ubifs_info *c1 = data;
2329 struct ubifs_info *c = sb->s_fs_info;
2331 return c->vi.cdev == c1->vi.cdev;
2334 static int sb_set(struct super_block *sb, void *data)
2336 sb->s_fs_info = data;
2337 return set_anon_super(sb, NULL);
2340 static struct super_block *alloc_super(struct file_system_type *type, int flags)
2342 struct super_block *s;
2345 s = kzalloc(sizeof(struct super_block), GFP_USER);
2348 return ERR_PTR(err);
2351 INIT_HLIST_NODE(&s->s_instances);
2352 INIT_LIST_HEAD(&s->s_inodes);
2353 s->s_time_gran = 1000000000;
2360 * sget - find or create a superblock
2361 * @type: filesystem type superblock should belong to
2362 * @test: comparison callback
2363 * @set: setup callback
2364 * @flags: mount flags
2365 * @data: argument to each of them
2367 struct super_block *sget(struct file_system_type *type,
2368 int (*test)(struct super_block *,void *),
2369 int (*set)(struct super_block *,void *),
2373 struct super_block *s = NULL;
2375 struct super_block *old;
2381 spin_lock(&sb_lock);
2383 hlist_for_each_entry(old, &type->fs_supers, s_instances) {
2384 if (!test(old, data))
2386 if (!grab_super(old))
2389 up_write(&s->s_umount);
2398 spin_unlock(&sb_lock);
2399 s = alloc_super(type, flags);
2401 return ERR_PTR(-ENOMEM);
2410 spin_unlock(&sb_lock);
2411 up_write(&s->s_umount);
2414 return ERR_PTR(err);
2418 strlcpy(s->s_id, type->name, sizeof(s->s_id));
2420 strncpy(s->s_id, type->name, sizeof(s->s_id));
2422 list_add_tail(&s->s_list, &super_blocks);
2423 hlist_add_head(&s->s_instances, &type->fs_supers);
2425 spin_unlock(&sb_lock);
2426 get_filesystem(type);
2427 register_shrinker(&s->s_shrink);
2432 EXPORT_SYMBOL(sget);
2435 static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
2436 const char *name, void *data)
2438 struct ubi_volume_desc *ubi;
2439 struct ubifs_info *c;
2440 struct super_block *sb;
2443 dbg_gen("name %s, flags %#x", name, flags);
2446 * Get UBI device number and volume ID. Mount it read-only so far
2447 * because this might be a new mount point, and UBI allows only one
2448 * read-write user at a time.
2450 ubi = open_ubi(name, UBI_READONLY);
2452 ubifs_err("cannot open \"%s\", error %d",
2453 name, (int)PTR_ERR(ubi));
2454 return ERR_CAST(ubi);
2457 c = alloc_ubifs_info(ubi);
2463 dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
2465 sb = sget(fs_type, sb_test, sb_set, flags, c);
2473 struct ubifs_info *c1 = sb->s_fs_info;
2475 /* A new mount point for already mounted UBIFS */
2476 dbg_gen("this ubi volume is already mounted");
2477 if (!!(flags & MS_RDONLY) != c1->ro_mount) {
2482 err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
2485 /* We do not support atime */
2486 sb->s_flags |= MS_ACTIVE | MS_NOATIME;
2489 /* 'fill_super()' opens ubi again so we must close it here */
2490 ubi_close_volume(ubi);
2496 return dget(sb->s_root);
2501 deactivate_locked_super(sb);
2504 ubi_close_volume(ubi);
2505 return ERR_PTR(err);
2508 static void kill_ubifs_super(struct super_block *s)
2510 struct ubifs_info *c = s->s_fs_info;
2517 static struct file_system_type ubifs_fs_type = {
2519 .owner = THIS_MODULE,
2520 .mount = ubifs_mount,
2521 .kill_sb = kill_ubifs_super,
2524 MODULE_ALIAS_FS("ubifs");
2527 * Inode slab cache constructor.
2529 static void inode_slab_ctor(void *obj)
2531 struct ubifs_inode *ui = obj;
2532 inode_init_once(&ui->vfs_inode);
2535 static int __init ubifs_init(void)
2537 int ubifs_init(void)
2542 BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
2544 /* Make sure node sizes are 8-byte aligned */
2545 BUILD_BUG_ON(UBIFS_CH_SZ & 7);
2546 BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7);
2547 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
2548 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
2549 BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
2550 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
2551 BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7);
2552 BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7);
2553 BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7);
2554 BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7);
2555 BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
2557 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
2558 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
2559 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
2560 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7);
2561 BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7);
2562 BUILD_BUG_ON(MIN_WRITE_SZ & 7);
2564 /* Check min. node size */
2565 BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ);
2566 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
2567 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
2568 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
2570 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2571 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2572 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
2573 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ);
2575 /* Defined node sizes */
2576 BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096);
2577 BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
2578 BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
2579 BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
2582 * We use 2 bit wide bit-fields to store compression type, which should
2583 * be amended if more compressors are added. The bit-fields are:
2584 * @compr_type in 'struct ubifs_inode', @default_compr in
2585 * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'.
2587 BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
2590 * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to
2591 * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
2593 if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) {
2594 ubifs_err("VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes",
2595 (unsigned int)PAGE_CACHE_SIZE);
2600 ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
2601 sizeof(struct ubifs_inode), 0,
2602 SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT,
2604 if (!ubifs_inode_slab)
2607 register_shrinker(&ubifs_shrinker_info);
2610 err = ubifs_compressors_init();
2615 err = dbg_debugfs_init();
2619 err = register_filesystem(&ubifs_fs_type);
2621 ubifs_err("cannot register file system, error %d", err);
2631 ubifs_compressors_exit();
2635 unregister_shrinker(&ubifs_shrinker_info);
2637 kmem_cache_destroy(ubifs_inode_slab);
2640 /* late_initcall to let compressors initialize first */
2641 late_initcall(ubifs_init);
2644 static void __exit ubifs_exit(void)
2646 ubifs_assert(list_empty(&ubifs_infos));
2647 ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0);
2650 ubifs_compressors_exit();
2651 unregister_shrinker(&ubifs_shrinker_info);
2654 * Make sure all delayed rcu free inodes are flushed before we
2658 kmem_cache_destroy(ubifs_inode_slab);
2659 unregister_filesystem(&ubifs_fs_type);
2661 module_exit(ubifs_exit);
2663 MODULE_LICENSE("GPL");
2664 MODULE_VERSION(__stringify(UBIFS_VERSION));
2665 MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2666 MODULE_DESCRIPTION("UBIFS - UBI File System");
2668 int uboot_ubifs_mount(char *vol_name)
2674 * First unmount if allready mounted
2677 ubifs_umount(ubifs_sb->s_fs_info);
2680 * Mount in read-only mode
2683 ret = ubifs_mount(&ubifs_fs_type, flags, vol_name, NULL);
2685 printf("Error reading superblock on volume '%s' " \
2686 "errno=%d!\n", vol_name, (int)PTR_ERR(ret));