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.
20 #include <linux/init.h>
21 #include <linux/slab.h>
22 #include <linux/module.h>
23 #include <linux/ctype.h>
24 #include <linux/kthread.h>
25 #include <linux/parser.h>
26 #include <linux/seq_file.h>
27 #include <linux/mount.h>
28 #include <linux/math64.h>
29 #include <linux/writeback.h>
32 #include <linux/compat.h>
33 #include <linux/stat.h>
34 #include <linux/err.h>
36 #include <ubi_uboot.h>
37 #include <mtd/ubi-user.h>
45 #define INODE_LOCKED_MAX 64
47 struct super_block
*ubifs_sb
;
48 LIST_HEAD(super_blocks
);
50 static struct inode
*inodes_locked_down
[INODE_LOCKED_MAX
];
52 int set_anon_super(struct super_block
*s
, void *data
)
57 struct inode
*iget_locked(struct super_block
*sb
, unsigned long ino
)
61 inode
= (struct inode
*)malloc(sizeof(struct ubifs_inode
));
65 list_add(&inode
->i_sb_list
, &sb
->s_inodes
);
66 inode
->i_state
= I_LOCK
| I_NEW
;
72 void iget_failed(struct inode
*inode
)
76 int ubifs_iput(struct inode
*inode
)
78 list_del_init(&inode
->i_sb_list
);
85 * Lock (save) inode in inode array for readback after recovery
87 void iput(struct inode
*inode
)
95 for (i
= 0; i
< INODE_LOCKED_MAX
; i
++) {
96 if (inodes_locked_down
[i
] == NULL
)
100 if (i
>= INODE_LOCKED_MAX
) {
101 ubifs_err("Error, can't lock (save) more inodes while recovery!!!");
106 * Allocate and use new inode
108 ino
= (struct inode
*)malloc(sizeof(struct ubifs_inode
));
109 memcpy(ino
, inode
, sizeof(struct ubifs_inode
));
112 * Finally save inode in array
114 inodes_locked_down
[i
] = ino
;
117 /* from fs/inode.c */
119 * clear_nlink - directly zero an inode's link count
122 * This is a low-level filesystem helper to replace any
123 * direct filesystem manipulation of i_nlink. See
124 * drop_nlink() for why we care about i_nlink hitting zero.
126 void clear_nlink(struct inode
*inode
)
128 if (inode
->i_nlink
) {
129 inode
->__i_nlink
= 0;
130 atomic_long_inc(&inode
->i_sb
->s_remove_count
);
133 EXPORT_SYMBOL(clear_nlink
);
136 * set_nlink - directly set an inode's link count
138 * @nlink: new nlink (should be non-zero)
140 * This is a low-level filesystem helper to replace any
141 * direct filesystem manipulation of i_nlink.
143 void set_nlink(struct inode
*inode
, unsigned int nlink
)
148 /* Yes, some filesystems do change nlink from zero to one */
149 if (inode
->i_nlink
== 0)
150 atomic_long_dec(&inode
->i_sb
->s_remove_count
);
152 inode
->__i_nlink
= nlink
;
155 EXPORT_SYMBOL(set_nlink
);
157 /* from include/linux/fs.h */
158 static inline void i_uid_write(struct inode
*inode
, uid_t uid
)
160 inode
->i_uid
.val
= uid
;
163 static inline void i_gid_write(struct inode
*inode
, gid_t gid
)
165 inode
->i_gid
.val
= gid
;
168 void unlock_new_inode(struct inode
*inode
)
175 * Maximum amount of memory we may 'kmalloc()' without worrying that we are
176 * allocating too much.
178 #define UBIFS_KMALLOC_OK (128*1024)
180 /* Slab cache for UBIFS inodes */
181 struct kmem_cache
*ubifs_inode_slab
;
184 /* UBIFS TNC shrinker description */
185 static struct shrinker ubifs_shrinker_info
= {
186 .scan_objects
= ubifs_shrink_scan
,
187 .count_objects
= ubifs_shrink_count
,
188 .seeks
= DEFAULT_SEEKS
,
193 * validate_inode - validate inode.
194 * @c: UBIFS file-system description object
195 * @inode: the inode to validate
197 * This is a helper function for 'ubifs_iget()' which validates various fields
198 * of a newly built inode to make sure they contain sane values and prevent
199 * possible vulnerabilities. Returns zero if the inode is all right and
200 * a non-zero error code if not.
202 static int validate_inode(struct ubifs_info
*c
, const struct inode
*inode
)
205 const struct ubifs_inode
*ui
= ubifs_inode(inode
);
207 if (inode
->i_size
> c
->max_inode_sz
) {
208 ubifs_err("inode is too large (%lld)",
209 (long long)inode
->i_size
);
213 if (ui
->compr_type
< 0 || ui
->compr_type
>= UBIFS_COMPR_TYPES_CNT
) {
214 ubifs_err("unknown compression type %d", ui
->compr_type
);
218 if (ui
->xattr_names
+ ui
->xattr_cnt
> XATTR_LIST_MAX
)
221 if (ui
->data_len
< 0 || ui
->data_len
> UBIFS_MAX_INO_DATA
)
224 if (ui
->xattr
&& !S_ISREG(inode
->i_mode
))
227 if (!ubifs_compr_present(ui
->compr_type
)) {
228 ubifs_warn("inode %lu uses '%s' compression, but it was not compiled in",
229 inode
->i_ino
, ubifs_compr_name(ui
->compr_type
));
232 err
= dbg_check_dir(c
, inode
);
236 struct inode
*ubifs_iget(struct super_block
*sb
, unsigned long inum
)
240 struct ubifs_ino_node
*ino
;
241 struct ubifs_info
*c
= sb
->s_fs_info
;
243 struct ubifs_inode
*ui
;
248 dbg_gen("inode %lu", inum
);
252 * U-Boot special handling of locked down inodes via recovery
253 * e.g. ubifs_recover_size()
255 for (i
= 0; i
< INODE_LOCKED_MAX
; i
++) {
257 * Exit on last entry (NULL), inode not found in list
259 if (inodes_locked_down
[i
] == NULL
)
262 if (inodes_locked_down
[i
]->i_ino
== inum
) {
264 * We found the locked down inode in our array,
265 * so just return this pointer instead of creating
268 return inodes_locked_down
[i
];
273 inode
= iget_locked(sb
, inum
);
275 return ERR_PTR(-ENOMEM
);
276 if (!(inode
->i_state
& I_NEW
))
278 ui
= ubifs_inode(inode
);
280 ino
= kmalloc(UBIFS_MAX_INO_NODE_SZ
, GFP_NOFS
);
286 ino_key_init(c
, &key
, inode
->i_ino
);
288 err
= ubifs_tnc_lookup(c
, &key
, ino
);
292 inode
->i_flags
|= (S_NOCMTIME
| S_NOATIME
);
293 set_nlink(inode
, le32_to_cpu(ino
->nlink
));
294 i_uid_write(inode
, le32_to_cpu(ino
->uid
));
295 i_gid_write(inode
, le32_to_cpu(ino
->gid
));
296 inode
->i_atime
.tv_sec
= (int64_t)le64_to_cpu(ino
->atime_sec
);
297 inode
->i_atime
.tv_nsec
= le32_to_cpu(ino
->atime_nsec
);
298 inode
->i_mtime
.tv_sec
= (int64_t)le64_to_cpu(ino
->mtime_sec
);
299 inode
->i_mtime
.tv_nsec
= le32_to_cpu(ino
->mtime_nsec
);
300 inode
->i_ctime
.tv_sec
= (int64_t)le64_to_cpu(ino
->ctime_sec
);
301 inode
->i_ctime
.tv_nsec
= le32_to_cpu(ino
->ctime_nsec
);
302 inode
->i_mode
= le32_to_cpu(ino
->mode
);
303 inode
->i_size
= le64_to_cpu(ino
->size
);
305 ui
->data_len
= le32_to_cpu(ino
->data_len
);
306 ui
->flags
= le32_to_cpu(ino
->flags
);
307 ui
->compr_type
= le16_to_cpu(ino
->compr_type
);
308 ui
->creat_sqnum
= le64_to_cpu(ino
->creat_sqnum
);
309 ui
->xattr_cnt
= le32_to_cpu(ino
->xattr_cnt
);
310 ui
->xattr_size
= le32_to_cpu(ino
->xattr_size
);
311 ui
->xattr_names
= le32_to_cpu(ino
->xattr_names
);
312 ui
->synced_i_size
= ui
->ui_size
= inode
->i_size
;
314 ui
->xattr
= (ui
->flags
& UBIFS_XATTR_FL
) ? 1 : 0;
316 err
= validate_inode(c
, inode
);
321 /* Disable read-ahead */
322 inode
->i_mapping
->backing_dev_info
= &c
->bdi
;
324 switch (inode
->i_mode
& S_IFMT
) {
326 inode
->i_mapping
->a_ops
= &ubifs_file_address_operations
;
327 inode
->i_op
= &ubifs_file_inode_operations
;
328 inode
->i_fop
= &ubifs_file_operations
;
330 ui
->data
= kmalloc(ui
->data_len
+ 1, GFP_NOFS
);
335 memcpy(ui
->data
, ino
->data
, ui
->data_len
);
336 ((char *)ui
->data
)[ui
->data_len
] = '\0';
337 } else if (ui
->data_len
!= 0) {
343 inode
->i_op
= &ubifs_dir_inode_operations
;
344 inode
->i_fop
= &ubifs_dir_operations
;
345 if (ui
->data_len
!= 0) {
351 inode
->i_op
= &ubifs_symlink_inode_operations
;
352 if (ui
->data_len
<= 0 || ui
->data_len
> UBIFS_MAX_INO_DATA
) {
356 ui
->data
= kmalloc(ui
->data_len
+ 1, GFP_NOFS
);
361 memcpy(ui
->data
, ino
->data
, ui
->data_len
);
362 ((char *)ui
->data
)[ui
->data_len
] = '\0';
368 union ubifs_dev_desc
*dev
;
370 ui
->data
= kmalloc(sizeof(union ubifs_dev_desc
), GFP_NOFS
);
376 dev
= (union ubifs_dev_desc
*)ino
->data
;
377 if (ui
->data_len
== sizeof(dev
->new))
378 rdev
= new_decode_dev(le32_to_cpu(dev
->new));
379 else if (ui
->data_len
== sizeof(dev
->huge
))
380 rdev
= huge_decode_dev(le64_to_cpu(dev
->huge
));
385 memcpy(ui
->data
, ino
->data
, ui
->data_len
);
386 inode
->i_op
= &ubifs_file_inode_operations
;
387 init_special_inode(inode
, inode
->i_mode
, rdev
);
392 inode
->i_op
= &ubifs_file_inode_operations
;
393 init_special_inode(inode
, inode
->i_mode
, 0);
394 if (ui
->data_len
!= 0) {
404 if ((inode
->i_mode
& S_IFMT
) == S_IFLNK
) {
405 if (ui
->data_len
<= 0 || ui
->data_len
> UBIFS_MAX_INO_DATA
) {
409 ui
->data
= kmalloc(ui
->data_len
+ 1, GFP_NOFS
);
414 memcpy(ui
->data
, ino
->data
, ui
->data_len
);
415 ((char *)ui
->data
)[ui
->data_len
] = '\0';
421 ubifs_set_inode_flags(inode
);
423 unlock_new_inode(inode
);
427 ubifs_err("inode %lu validation failed, error %d", inode
->i_ino
, err
);
428 ubifs_dump_node(c
, ino
);
429 ubifs_dump_inode(c
, inode
);
434 ubifs_err("failed to read inode %lu, error %d", inode
->i_ino
, err
);
439 static struct inode
*ubifs_alloc_inode(struct super_block
*sb
)
441 struct ubifs_inode
*ui
;
443 ui
= kmem_cache_alloc(ubifs_inode_slab
, GFP_NOFS
);
447 memset((void *)ui
+ sizeof(struct inode
), 0,
448 sizeof(struct ubifs_inode
) - sizeof(struct inode
));
449 mutex_init(&ui
->ui_mutex
);
450 spin_lock_init(&ui
->ui_lock
);
451 return &ui
->vfs_inode
;
455 static void ubifs_i_callback(struct rcu_head
*head
)
457 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
458 struct ubifs_inode
*ui
= ubifs_inode(inode
);
459 kmem_cache_free(ubifs_inode_slab
, ui
);
462 static void ubifs_destroy_inode(struct inode
*inode
)
464 struct ubifs_inode
*ui
= ubifs_inode(inode
);
467 call_rcu(&inode
->i_rcu
, ubifs_i_callback
);
471 * Note, Linux write-back code calls this without 'i_mutex'.
473 static int ubifs_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
476 struct ubifs_info
*c
= inode
->i_sb
->s_fs_info
;
477 struct ubifs_inode
*ui
= ubifs_inode(inode
);
479 ubifs_assert(!ui
->xattr
);
480 if (is_bad_inode(inode
))
483 mutex_lock(&ui
->ui_mutex
);
485 * Due to races between write-back forced by budgeting
486 * (see 'sync_some_inodes()') and background write-back, the inode may
487 * have already been synchronized, do not do this again. This might
488 * also happen if it was synchronized in an VFS operation, e.g.
492 mutex_unlock(&ui
->ui_mutex
);
497 * As an optimization, do not write orphan inodes to the media just
498 * because this is not needed.
500 dbg_gen("inode %lu, mode %#x, nlink %u",
501 inode
->i_ino
, (int)inode
->i_mode
, inode
->i_nlink
);
502 if (inode
->i_nlink
) {
503 err
= ubifs_jnl_write_inode(c
, inode
);
505 ubifs_err("can't write inode %lu, error %d",
508 err
= dbg_check_inode_size(c
, inode
, ui
->ui_size
);
512 mutex_unlock(&ui
->ui_mutex
);
513 ubifs_release_dirty_inode_budget(c
, ui
);
517 static void ubifs_evict_inode(struct inode
*inode
)
520 struct ubifs_info
*c
= inode
->i_sb
->s_fs_info
;
521 struct ubifs_inode
*ui
= ubifs_inode(inode
);
525 * Extended attribute inode deletions are fully handled in
526 * 'ubifs_removexattr()'. These inodes are special and have
527 * limited usage, so there is nothing to do here.
531 dbg_gen("inode %lu, mode %#x", inode
->i_ino
, (int)inode
->i_mode
);
532 ubifs_assert(!atomic_read(&inode
->i_count
));
534 truncate_inode_pages(&inode
->i_data
, 0);
539 if (is_bad_inode(inode
))
542 ui
->ui_size
= inode
->i_size
= 0;
543 err
= ubifs_jnl_delete_inode(c
, inode
);
546 * Worst case we have a lost orphan inode wasting space, so a
547 * simple error message is OK here.
549 ubifs_err("can't delete inode %lu, error %d",
554 ubifs_release_dirty_inode_budget(c
, ui
);
556 /* We've deleted something - clean the "no space" flags */
557 c
->bi
.nospace
= c
->bi
.nospace_rp
= 0;
565 static void ubifs_dirty_inode(struct inode
*inode
, int flags
)
567 struct ubifs_inode
*ui
= ubifs_inode(inode
);
569 ubifs_assert(mutex_is_locked(&ui
->ui_mutex
));
572 dbg_gen("inode %lu", inode
->i_ino
);
577 static int ubifs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
579 struct ubifs_info
*c
= dentry
->d_sb
->s_fs_info
;
580 unsigned long long free
;
581 __le32
*uuid
= (__le32
*)c
->uuid
;
583 free
= ubifs_get_free_space(c
);
584 dbg_gen("free space %lld bytes (%lld blocks)",
585 free
, free
>> UBIFS_BLOCK_SHIFT
);
587 buf
->f_type
= UBIFS_SUPER_MAGIC
;
588 buf
->f_bsize
= UBIFS_BLOCK_SIZE
;
589 buf
->f_blocks
= c
->block_cnt
;
590 buf
->f_bfree
= free
>> UBIFS_BLOCK_SHIFT
;
591 if (free
> c
->report_rp_size
)
592 buf
->f_bavail
= (free
- c
->report_rp_size
) >> UBIFS_BLOCK_SHIFT
;
597 buf
->f_namelen
= UBIFS_MAX_NLEN
;
598 buf
->f_fsid
.val
[0] = le32_to_cpu(uuid
[0]) ^ le32_to_cpu(uuid
[2]);
599 buf
->f_fsid
.val
[1] = le32_to_cpu(uuid
[1]) ^ le32_to_cpu(uuid
[3]);
600 ubifs_assert(buf
->f_bfree
<= c
->block_cnt
);
604 static int ubifs_show_options(struct seq_file
*s
, struct dentry
*root
)
606 struct ubifs_info
*c
= root
->d_sb
->s_fs_info
;
608 if (c
->mount_opts
.unmount_mode
== 2)
609 seq_printf(s
, ",fast_unmount");
610 else if (c
->mount_opts
.unmount_mode
== 1)
611 seq_printf(s
, ",norm_unmount");
613 if (c
->mount_opts
.bulk_read
== 2)
614 seq_printf(s
, ",bulk_read");
615 else if (c
->mount_opts
.bulk_read
== 1)
616 seq_printf(s
, ",no_bulk_read");
618 if (c
->mount_opts
.chk_data_crc
== 2)
619 seq_printf(s
, ",chk_data_crc");
620 else if (c
->mount_opts
.chk_data_crc
== 1)
621 seq_printf(s
, ",no_chk_data_crc");
623 if (c
->mount_opts
.override_compr
) {
624 seq_printf(s
, ",compr=%s",
625 ubifs_compr_name(c
->mount_opts
.compr_type
));
631 static int ubifs_sync_fs(struct super_block
*sb
, int wait
)
634 struct ubifs_info
*c
= sb
->s_fs_info
;
637 * Zero @wait is just an advisory thing to help the file system shove
638 * lots of data into the queues, and there will be the second
639 * '->sync_fs()' call, with non-zero @wait.
645 * Synchronize write buffers, because 'ubifs_run_commit()' does not
646 * do this if it waits for an already running commit.
648 for (i
= 0; i
< c
->jhead_cnt
; i
++) {
649 err
= ubifs_wbuf_sync(&c
->jheads
[i
].wbuf
);
655 * Strictly speaking, it is not necessary to commit the journal here,
656 * synchronizing write-buffers would be enough. But committing makes
657 * UBIFS free space predictions much more accurate, so we want to let
658 * the user be able to get more accurate results of 'statfs()' after
659 * they synchronize the file system.
661 err
= ubifs_run_commit(c
);
665 return ubi_sync(c
->vi
.ubi_num
);
670 * init_constants_early - initialize UBIFS constants.
671 * @c: UBIFS file-system description object
673 * This function initialize UBIFS constants which do not need the superblock to
674 * be read. It also checks that the UBI volume satisfies basic UBIFS
675 * requirements. Returns zero in case of success and a negative error code in
678 static int init_constants_early(struct ubifs_info
*c
)
680 if (c
->vi
.corrupted
) {
681 ubifs_warn("UBI volume is corrupted - read-only mode");
686 ubifs_msg("read-only UBI device");
690 if (c
->vi
.vol_type
== UBI_STATIC_VOLUME
) {
691 ubifs_msg("static UBI volume - read-only mode");
695 c
->leb_cnt
= c
->vi
.size
;
696 c
->leb_size
= c
->vi
.usable_leb_size
;
697 c
->leb_start
= c
->di
.leb_start
;
698 c
->half_leb_size
= c
->leb_size
/ 2;
699 c
->min_io_size
= c
->di
.min_io_size
;
700 c
->min_io_shift
= fls(c
->min_io_size
) - 1;
701 c
->max_write_size
= c
->di
.max_write_size
;
702 c
->max_write_shift
= fls(c
->max_write_size
) - 1;
704 if (c
->leb_size
< UBIFS_MIN_LEB_SZ
) {
705 ubifs_err("too small LEBs (%d bytes), min. is %d bytes",
706 c
->leb_size
, UBIFS_MIN_LEB_SZ
);
710 if (c
->leb_cnt
< UBIFS_MIN_LEB_CNT
) {
711 ubifs_err("too few LEBs (%d), min. is %d",
712 c
->leb_cnt
, UBIFS_MIN_LEB_CNT
);
716 if (!is_power_of_2(c
->min_io_size
)) {
717 ubifs_err("bad min. I/O size %d", c
->min_io_size
);
722 * Maximum write size has to be greater or equivalent to min. I/O
723 * size, and be multiple of min. I/O size.
725 if (c
->max_write_size
< c
->min_io_size
||
726 c
->max_write_size
% c
->min_io_size
||
727 !is_power_of_2(c
->max_write_size
)) {
728 ubifs_err("bad write buffer size %d for %d min. I/O unit",
729 c
->max_write_size
, c
->min_io_size
);
734 * UBIFS aligns all node to 8-byte boundary, so to make function in
735 * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
738 if (c
->min_io_size
< 8) {
741 if (c
->max_write_size
< c
->min_io_size
) {
742 c
->max_write_size
= c
->min_io_size
;
743 c
->max_write_shift
= c
->min_io_shift
;
747 c
->ref_node_alsz
= ALIGN(UBIFS_REF_NODE_SZ
, c
->min_io_size
);
748 c
->mst_node_alsz
= ALIGN(UBIFS_MST_NODE_SZ
, c
->min_io_size
);
751 * Initialize node length ranges which are mostly needed for node
754 c
->ranges
[UBIFS_PAD_NODE
].len
= UBIFS_PAD_NODE_SZ
;
755 c
->ranges
[UBIFS_SB_NODE
].len
= UBIFS_SB_NODE_SZ
;
756 c
->ranges
[UBIFS_MST_NODE
].len
= UBIFS_MST_NODE_SZ
;
757 c
->ranges
[UBIFS_REF_NODE
].len
= UBIFS_REF_NODE_SZ
;
758 c
->ranges
[UBIFS_TRUN_NODE
].len
= UBIFS_TRUN_NODE_SZ
;
759 c
->ranges
[UBIFS_CS_NODE
].len
= UBIFS_CS_NODE_SZ
;
761 c
->ranges
[UBIFS_INO_NODE
].min_len
= UBIFS_INO_NODE_SZ
;
762 c
->ranges
[UBIFS_INO_NODE
].max_len
= UBIFS_MAX_INO_NODE_SZ
;
763 c
->ranges
[UBIFS_ORPH_NODE
].min_len
=
764 UBIFS_ORPH_NODE_SZ
+ sizeof(__le64
);
765 c
->ranges
[UBIFS_ORPH_NODE
].max_len
= c
->leb_size
;
766 c
->ranges
[UBIFS_DENT_NODE
].min_len
= UBIFS_DENT_NODE_SZ
;
767 c
->ranges
[UBIFS_DENT_NODE
].max_len
= UBIFS_MAX_DENT_NODE_SZ
;
768 c
->ranges
[UBIFS_XENT_NODE
].min_len
= UBIFS_XENT_NODE_SZ
;
769 c
->ranges
[UBIFS_XENT_NODE
].max_len
= UBIFS_MAX_XENT_NODE_SZ
;
770 c
->ranges
[UBIFS_DATA_NODE
].min_len
= UBIFS_DATA_NODE_SZ
;
771 c
->ranges
[UBIFS_DATA_NODE
].max_len
= UBIFS_MAX_DATA_NODE_SZ
;
773 * Minimum indexing node size is amended later when superblock is
774 * read and the key length is known.
776 c
->ranges
[UBIFS_IDX_NODE
].min_len
= UBIFS_IDX_NODE_SZ
+ UBIFS_BRANCH_SZ
;
778 * Maximum indexing node size is amended later when superblock is
779 * read and the fanout is known.
781 c
->ranges
[UBIFS_IDX_NODE
].max_len
= INT_MAX
;
784 * Initialize dead and dark LEB space watermarks. See gc.c for comments
785 * about these values.
787 c
->dead_wm
= ALIGN(MIN_WRITE_SZ
, c
->min_io_size
);
788 c
->dark_wm
= ALIGN(UBIFS_MAX_NODE_SZ
, c
->min_io_size
);
791 * Calculate how many bytes would be wasted at the end of LEB if it was
792 * fully filled with data nodes of maximum size. This is used in
793 * calculations when reporting free space.
795 c
->leb_overhead
= c
->leb_size
% UBIFS_MAX_DATA_NODE_SZ
;
797 /* Buffer size for bulk-reads */
798 c
->max_bu_buf_len
= UBIFS_MAX_BULK_READ
* UBIFS_MAX_DATA_NODE_SZ
;
799 if (c
->max_bu_buf_len
> c
->leb_size
)
800 c
->max_bu_buf_len
= c
->leb_size
;
805 * bud_wbuf_callback - bud LEB write-buffer synchronization call-back.
806 * @c: UBIFS file-system description object
807 * @lnum: LEB the write-buffer was synchronized to
808 * @free: how many free bytes left in this LEB
809 * @pad: how many bytes were padded
811 * This is a callback function which is called by the I/O unit when the
812 * write-buffer is synchronized. We need this to correctly maintain space
813 * accounting in bud logical eraseblocks. This function returns zero in case of
814 * success and a negative error code in case of failure.
816 * This function actually belongs to the journal, but we keep it here because
817 * we want to keep it static.
819 static int bud_wbuf_callback(struct ubifs_info
*c
, int lnum
, int free
, int pad
)
821 return ubifs_update_one_lp(c
, lnum
, free
, pad
, 0, 0);
825 * init_constants_sb - initialize UBIFS constants.
826 * @c: UBIFS file-system description object
828 * This is a helper function which initializes various UBIFS constants after
829 * the superblock has been read. It also checks various UBIFS parameters and
830 * makes sure they are all right. Returns zero in case of success and a
831 * negative error code in case of failure.
833 static int init_constants_sb(struct ubifs_info
*c
)
838 c
->main_bytes
= (long long)c
->main_lebs
* c
->leb_size
;
839 c
->max_znode_sz
= sizeof(struct ubifs_znode
) +
840 c
->fanout
* sizeof(struct ubifs_zbranch
);
842 tmp
= ubifs_idx_node_sz(c
, 1);
843 c
->ranges
[UBIFS_IDX_NODE
].min_len
= tmp
;
844 c
->min_idx_node_sz
= ALIGN(tmp
, 8);
846 tmp
= ubifs_idx_node_sz(c
, c
->fanout
);
847 c
->ranges
[UBIFS_IDX_NODE
].max_len
= tmp
;
848 c
->max_idx_node_sz
= ALIGN(tmp
, 8);
850 /* Make sure LEB size is large enough to fit full commit */
851 tmp
= UBIFS_CS_NODE_SZ
+ UBIFS_REF_NODE_SZ
* c
->jhead_cnt
;
852 tmp
= ALIGN(tmp
, c
->min_io_size
);
853 if (tmp
> c
->leb_size
) {
854 ubifs_err("too small LEB size %d, at least %d needed",
860 * Make sure that the log is large enough to fit reference nodes for
861 * all buds plus one reserved LEB.
863 tmp64
= c
->max_bud_bytes
+ c
->leb_size
- 1;
864 c
->max_bud_cnt
= div_u64(tmp64
, c
->leb_size
);
865 tmp
= (c
->ref_node_alsz
* c
->max_bud_cnt
+ c
->leb_size
- 1);
868 if (c
->log_lebs
< tmp
) {
869 ubifs_err("too small log %d LEBs, required min. %d LEBs",
875 * When budgeting we assume worst-case scenarios when the pages are not
876 * be compressed and direntries are of the maximum size.
878 * Note, data, which may be stored in inodes is budgeted separately, so
879 * it is not included into 'c->bi.inode_budget'.
881 c
->bi
.page_budget
= UBIFS_MAX_DATA_NODE_SZ
* UBIFS_BLOCKS_PER_PAGE
;
882 c
->bi
.inode_budget
= UBIFS_INO_NODE_SZ
;
883 c
->bi
.dent_budget
= UBIFS_MAX_DENT_NODE_SZ
;
886 * When the amount of flash space used by buds becomes
887 * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit.
888 * The writers are unblocked when the commit is finished. To avoid
889 * writers to be blocked UBIFS initiates background commit in advance,
890 * when number of bud bytes becomes above the limit defined below.
892 c
->bg_bud_bytes
= (c
->max_bud_bytes
* 13) >> 4;
895 * Ensure minimum journal size. All the bytes in the journal heads are
896 * considered to be used, when calculating the current journal usage.
897 * Consequently, if the journal is too small, UBIFS will treat it as
900 tmp64
= (long long)(c
->jhead_cnt
+ 1) * c
->leb_size
+ 1;
901 if (c
->bg_bud_bytes
< tmp64
)
902 c
->bg_bud_bytes
= tmp64
;
903 if (c
->max_bud_bytes
< tmp64
+ c
->leb_size
)
904 c
->max_bud_bytes
= tmp64
+ c
->leb_size
;
906 err
= ubifs_calc_lpt_geom(c
);
910 /* Initialize effective LEB size used in budgeting calculations */
911 c
->idx_leb_size
= c
->leb_size
- c
->max_idx_node_sz
;
916 * init_constants_master - initialize UBIFS constants.
917 * @c: UBIFS file-system description object
919 * This is a helper function which initializes various UBIFS constants after
920 * the master node has been read. It also checks various UBIFS parameters and
921 * makes sure they are all right.
923 static void init_constants_master(struct ubifs_info
*c
)
927 c
->bi
.min_idx_lebs
= ubifs_calc_min_idx_lebs(c
);
928 c
->report_rp_size
= ubifs_reported_space(c
, c
->rp_size
);
931 * Calculate total amount of FS blocks. This number is not used
932 * internally because it does not make much sense for UBIFS, but it is
933 * necessary to report something for the 'statfs()' call.
935 * Subtract the LEB reserved for GC, the LEB which is reserved for
936 * deletions, minimum LEBs for the index, and assume only one journal
939 tmp64
= c
->main_lebs
- 1 - 1 - MIN_INDEX_LEBS
- c
->jhead_cnt
+ 1;
940 tmp64
*= (long long)c
->leb_size
- c
->leb_overhead
;
941 tmp64
= ubifs_reported_space(c
, tmp64
);
942 c
->block_cnt
= tmp64
>> UBIFS_BLOCK_SHIFT
;
946 * take_gc_lnum - reserve GC LEB.
947 * @c: UBIFS file-system description object
949 * This function ensures that the LEB reserved for garbage collection is marked
950 * as "taken" in lprops. We also have to set free space to LEB size and dirty
951 * space to zero, because lprops may contain out-of-date information if the
952 * file-system was un-mounted before it has been committed. This function
953 * returns zero in case of success and a negative error code in case of
956 static int take_gc_lnum(struct ubifs_info
*c
)
960 if (c
->gc_lnum
== -1) {
961 ubifs_err("no LEB for GC");
965 /* And we have to tell lprops that this LEB is taken */
966 err
= ubifs_change_one_lp(c
, c
->gc_lnum
, c
->leb_size
, 0,
972 * alloc_wbufs - allocate write-buffers.
973 * @c: UBIFS file-system description object
975 * This helper function allocates and initializes UBIFS write-buffers. Returns
976 * zero in case of success and %-ENOMEM in case of failure.
978 static int alloc_wbufs(struct ubifs_info
*c
)
982 c
->jheads
= kzalloc(c
->jhead_cnt
* sizeof(struct ubifs_jhead
),
987 /* Initialize journal heads */
988 for (i
= 0; i
< c
->jhead_cnt
; i
++) {
989 INIT_LIST_HEAD(&c
->jheads
[i
].buds_list
);
990 err
= ubifs_wbuf_init(c
, &c
->jheads
[i
].wbuf
);
994 c
->jheads
[i
].wbuf
.sync_callback
= &bud_wbuf_callback
;
995 c
->jheads
[i
].wbuf
.jhead
= i
;
996 c
->jheads
[i
].grouped
= 1;
1000 * Garbage Collector head does not need to be synchronized by timer.
1001 * Also GC head nodes are not grouped.
1003 c
->jheads
[GCHD
].wbuf
.no_timer
= 1;
1004 c
->jheads
[GCHD
].grouped
= 0;
1010 * free_wbufs - free write-buffers.
1011 * @c: UBIFS file-system description object
1013 static void free_wbufs(struct ubifs_info
*c
)
1018 for (i
= 0; i
< c
->jhead_cnt
; i
++) {
1019 kfree(c
->jheads
[i
].wbuf
.buf
);
1020 kfree(c
->jheads
[i
].wbuf
.inodes
);
1028 * free_orphans - free orphans.
1029 * @c: UBIFS file-system description object
1031 static void free_orphans(struct ubifs_info
*c
)
1033 struct ubifs_orphan
*orph
;
1035 while (c
->orph_dnext
) {
1036 orph
= c
->orph_dnext
;
1037 c
->orph_dnext
= orph
->dnext
;
1038 list_del(&orph
->list
);
1042 while (!list_empty(&c
->orph_list
)) {
1043 orph
= list_entry(c
->orph_list
.next
, struct ubifs_orphan
, list
);
1044 list_del(&orph
->list
);
1046 ubifs_err("orphan list not empty at unmount");
1055 * free_buds - free per-bud objects.
1056 * @c: UBIFS file-system description object
1058 static void free_buds(struct ubifs_info
*c
)
1060 struct ubifs_bud
*bud
, *n
;
1062 rbtree_postorder_for_each_entry_safe(bud
, n
, &c
->buds
, rb
)
1068 * check_volume_empty - check if the UBI volume is empty.
1069 * @c: UBIFS file-system description object
1071 * This function checks if the UBIFS volume is empty by looking if its LEBs are
1072 * mapped or not. The result of checking is stored in the @c->empty variable.
1073 * Returns zero in case of success and a negative error code in case of
1076 static int check_volume_empty(struct ubifs_info
*c
)
1081 for (lnum
= 0; lnum
< c
->leb_cnt
; lnum
++) {
1082 err
= ubifs_is_mapped(c
, lnum
);
1083 if (unlikely(err
< 0))
1097 * UBIFS mount options.
1099 * Opt_fast_unmount: do not run a journal commit before un-mounting
1100 * Opt_norm_unmount: run a journal commit before un-mounting
1101 * Opt_bulk_read: enable bulk-reads
1102 * Opt_no_bulk_read: disable bulk-reads
1103 * Opt_chk_data_crc: check CRCs when reading data nodes
1104 * Opt_no_chk_data_crc: do not check CRCs when reading data nodes
1105 * Opt_override_compr: override default compressor
1106 * Opt_err: just end of array marker
1114 Opt_no_chk_data_crc
,
1120 static const match_table_t tokens
= {
1121 {Opt_fast_unmount
, "fast_unmount"},
1122 {Opt_norm_unmount
, "norm_unmount"},
1123 {Opt_bulk_read
, "bulk_read"},
1124 {Opt_no_bulk_read
, "no_bulk_read"},
1125 {Opt_chk_data_crc
, "chk_data_crc"},
1126 {Opt_no_chk_data_crc
, "no_chk_data_crc"},
1127 {Opt_override_compr
, "compr=%s"},
1132 * parse_standard_option - parse a standard mount option.
1133 * @option: the option to parse
1135 * Normally, standard mount options like "sync" are passed to file-systems as
1136 * flags. However, when a "rootflags=" kernel boot parameter is used, they may
1137 * be present in the options string. This function tries to deal with this
1138 * situation and parse standard options. Returns 0 if the option was not
1139 * recognized, and the corresponding integer flag if it was.
1141 * UBIFS is only interested in the "sync" option, so do not check for anything
1144 static int parse_standard_option(const char *option
)
1146 ubifs_msg("parse %s", option
);
1147 if (!strcmp(option
, "sync"))
1148 return MS_SYNCHRONOUS
;
1153 * ubifs_parse_options - parse mount parameters.
1154 * @c: UBIFS file-system description object
1155 * @options: parameters to parse
1156 * @is_remount: non-zero if this is FS re-mount
1158 * This function parses UBIFS mount options and returns zero in case success
1159 * and a negative error code in case of failure.
1161 static int ubifs_parse_options(struct ubifs_info
*c
, char *options
,
1165 substring_t args
[MAX_OPT_ARGS
];
1170 while ((p
= strsep(&options
, ","))) {
1176 token
= match_token(p
, tokens
, args
);
1179 * %Opt_fast_unmount and %Opt_norm_unmount options are ignored.
1180 * We accept them in order to be backward-compatible. But this
1181 * should be removed at some point.
1183 case Opt_fast_unmount
:
1184 c
->mount_opts
.unmount_mode
= 2;
1186 case Opt_norm_unmount
:
1187 c
->mount_opts
.unmount_mode
= 1;
1190 c
->mount_opts
.bulk_read
= 2;
1193 case Opt_no_bulk_read
:
1194 c
->mount_opts
.bulk_read
= 1;
1197 case Opt_chk_data_crc
:
1198 c
->mount_opts
.chk_data_crc
= 2;
1199 c
->no_chk_data_crc
= 0;
1201 case Opt_no_chk_data_crc
:
1202 c
->mount_opts
.chk_data_crc
= 1;
1203 c
->no_chk_data_crc
= 1;
1205 case Opt_override_compr
:
1207 char *name
= match_strdup(&args
[0]);
1211 if (!strcmp(name
, "none"))
1212 c
->mount_opts
.compr_type
= UBIFS_COMPR_NONE
;
1213 else if (!strcmp(name
, "lzo"))
1214 c
->mount_opts
.compr_type
= UBIFS_COMPR_LZO
;
1215 else if (!strcmp(name
, "zlib"))
1216 c
->mount_opts
.compr_type
= UBIFS_COMPR_ZLIB
;
1218 ubifs_err("unknown compressor \"%s\"", name
);
1223 c
->mount_opts
.override_compr
= 1;
1224 c
->default_compr
= c
->mount_opts
.compr_type
;
1230 struct super_block
*sb
= c
->vfs_sb
;
1232 flag
= parse_standard_option(p
);
1234 ubifs_err("unrecognized mount option \"%s\" or missing value",
1238 sb
->s_flags
|= flag
;
1248 * destroy_journal - destroy journal data structures.
1249 * @c: UBIFS file-system description object
1251 * This function destroys journal data structures including those that may have
1252 * been created by recovery functions.
1254 static void destroy_journal(struct ubifs_info
*c
)
1256 while (!list_empty(&c
->unclean_leb_list
)) {
1257 struct ubifs_unclean_leb
*ucleb
;
1259 ucleb
= list_entry(c
->unclean_leb_list
.next
,
1260 struct ubifs_unclean_leb
, list
);
1261 list_del(&ucleb
->list
);
1264 while (!list_empty(&c
->old_buds
)) {
1265 struct ubifs_bud
*bud
;
1267 bud
= list_entry(c
->old_buds
.next
, struct ubifs_bud
, list
);
1268 list_del(&bud
->list
);
1271 ubifs_destroy_idx_gc(c
);
1272 ubifs_destroy_size_tree(c
);
1279 * bu_init - initialize bulk-read information.
1280 * @c: UBIFS file-system description object
1282 static void bu_init(struct ubifs_info
*c
)
1284 ubifs_assert(c
->bulk_read
== 1);
1287 return; /* Already initialized */
1290 c
->bu
.buf
= kmalloc(c
->max_bu_buf_len
, GFP_KERNEL
| __GFP_NOWARN
);
1292 if (c
->max_bu_buf_len
> UBIFS_KMALLOC_OK
) {
1293 c
->max_bu_buf_len
= UBIFS_KMALLOC_OK
;
1297 /* Just disable bulk-read */
1298 ubifs_warn("cannot allocate %d bytes of memory for bulk-read, disabling it",
1300 c
->mount_opts
.bulk_read
= 1;
1308 * check_free_space - check if there is enough free space to mount.
1309 * @c: UBIFS file-system description object
1311 * This function makes sure UBIFS has enough free space to be mounted in
1312 * read/write mode. UBIFS must always have some free space to allow deletions.
1314 static int check_free_space(struct ubifs_info
*c
)
1316 ubifs_assert(c
->dark_wm
> 0);
1317 if (c
->lst
.total_free
+ c
->lst
.total_dirty
< c
->dark_wm
) {
1318 ubifs_err("insufficient free space to mount in R/W mode");
1319 ubifs_dump_budg(c
, &c
->bi
);
1320 ubifs_dump_lprops(c
);
1328 * mount_ubifs - mount UBIFS file-system.
1329 * @c: UBIFS file-system description object
1331 * This function mounts UBIFS file system. Returns zero in case of success and
1332 * a negative error code in case of failure.
1334 static int mount_ubifs(struct ubifs_info
*c
)
1340 c
->ro_mount
= !!(c
->vfs_sb
->s_flags
& MS_RDONLY
);
1343 printf("UBIFS: only ro mode in U-Boot allowed.\n");
1348 err
= init_constants_early(c
);
1352 err
= ubifs_debugging_init(c
);
1356 err
= check_volume_empty(c
);
1360 if (c
->empty
&& (c
->ro_mount
|| c
->ro_media
)) {
1362 * This UBI volume is empty, and read-only, or the file system
1363 * is mounted read-only - we cannot format it.
1365 ubifs_err("can't format empty UBI volume: read-only %s",
1366 c
->ro_media
? "UBI volume" : "mount");
1371 if (c
->ro_media
&& !c
->ro_mount
) {
1372 ubifs_err("cannot mount read-write - read-only media");
1378 * The requirement for the buffer is that it should fit indexing B-tree
1379 * height amount of integers. We assume the height if the TNC tree will
1383 c
->bottom_up_buf
= kmalloc(BOTTOM_UP_HEIGHT
* sizeof(int), GFP_KERNEL
);
1384 if (!c
->bottom_up_buf
)
1387 c
->sbuf
= vmalloc(c
->leb_size
);
1393 c
->ileb_buf
= vmalloc(c
->leb_size
);
1399 if (c
->bulk_read
== 1)
1404 c
->write_reserve_buf
= kmalloc(COMPRESSED_DATA_NODE_BUF_SZ
,
1406 if (!c
->write_reserve_buf
)
1413 err
= ubifs_read_superblock(c
);
1418 * Make sure the compressor which is set as default in the superblock
1419 * or overridden by mount options is actually compiled in.
1421 if (!ubifs_compr_present(c
->default_compr
)) {
1422 ubifs_err("'compressor \"%s\" is not compiled in",
1423 ubifs_compr_name(c
->default_compr
));
1428 err
= init_constants_sb(c
);
1432 sz
= ALIGN(c
->max_idx_node_sz
, c
->min_io_size
);
1433 sz
= ALIGN(sz
+ c
->max_idx_node_sz
, c
->min_io_size
);
1434 c
->cbuf
= kmalloc(sz
, GFP_NOFS
);
1440 err
= alloc_wbufs(c
);
1444 sprintf(c
->bgt_name
, BGT_NAME_PATTERN
, c
->vi
.ubi_num
, c
->vi
.vol_id
);
1447 /* Create background thread */
1448 c
->bgt
= kthread_create(ubifs_bg_thread
, c
, "%s", c
->bgt_name
);
1449 if (IS_ERR(c
->bgt
)) {
1450 err
= PTR_ERR(c
->bgt
);
1452 ubifs_err("cannot spawn \"%s\", error %d",
1456 wake_up_process(c
->bgt
);
1460 err
= ubifs_read_master(c
);
1464 init_constants_master(c
);
1466 if ((c
->mst_node
->flags
& cpu_to_le32(UBIFS_MST_DIRTY
)) != 0) {
1467 ubifs_msg("recovery needed");
1468 c
->need_recovery
= 1;
1472 if (c
->need_recovery
&& !c
->ro_mount
) {
1473 err
= ubifs_recover_inl_heads(c
, c
->sbuf
);
1479 err
= ubifs_lpt_init(c
, 1, !c
->ro_mount
);
1484 if (!c
->ro_mount
&& c
->space_fixup
) {
1485 err
= ubifs_fixup_free_space(c
);
1492 * Set the "dirty" flag so that if we reboot uncleanly we
1493 * will notice this immediately on the next mount.
1495 c
->mst_node
->flags
|= cpu_to_le32(UBIFS_MST_DIRTY
);
1496 err
= ubifs_write_master(c
);
1502 err
= dbg_check_idx_size(c
, c
->bi
.old_idx_sz
);
1507 err
= ubifs_replay_journal(c
);
1512 /* Calculate 'min_idx_lebs' after journal replay */
1513 c
->bi
.min_idx_lebs
= ubifs_calc_min_idx_lebs(c
);
1515 err
= ubifs_mount_orphans(c
, c
->need_recovery
, c
->ro_mount
);
1523 err
= check_free_space(c
);
1527 /* Check for enough log space */
1528 lnum
= c
->lhead_lnum
+ 1;
1529 if (lnum
>= UBIFS_LOG_LNUM
+ c
->log_lebs
)
1530 lnum
= UBIFS_LOG_LNUM
;
1531 if (lnum
== c
->ltail_lnum
) {
1532 err
= ubifs_consolidate_log(c
);
1537 if (c
->need_recovery
) {
1538 err
= ubifs_recover_size(c
);
1541 err
= ubifs_rcvry_gc_commit(c
);
1545 err
= take_gc_lnum(c
);
1550 * GC LEB may contain garbage if there was an unclean
1551 * reboot, and it should be un-mapped.
1553 err
= ubifs_leb_unmap(c
, c
->gc_lnum
);
1558 err
= dbg_check_lprops(c
);
1562 } else if (c
->need_recovery
) {
1563 err
= ubifs_recover_size(c
);
1568 * Even if we mount read-only, we have to set space in GC LEB
1569 * to proper value because this affects UBIFS free space
1570 * reporting. We do not want to have a situation when
1571 * re-mounting from R/O to R/W changes amount of free space.
1573 err
= take_gc_lnum(c
);
1579 spin_lock(&ubifs_infos_lock
);
1580 list_add_tail(&c
->infos_list
, &ubifs_infos
);
1581 spin_unlock(&ubifs_infos_lock
);
1584 if (c
->need_recovery
) {
1586 ubifs_msg("recovery deferred");
1588 c
->need_recovery
= 0;
1589 ubifs_msg("recovery completed");
1591 * GC LEB has to be empty and taken at this point. But
1592 * the journal head LEBs may also be accounted as
1593 * "empty taken" if they are empty.
1595 ubifs_assert(c
->lst
.taken_empty_lebs
> 0);
1598 ubifs_assert(c
->lst
.taken_empty_lebs
> 0);
1600 err
= dbg_check_filesystem(c
);
1604 err
= dbg_debugfs_init_fs(c
);
1610 ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"%s",
1611 c
->vi
.ubi_num
, c
->vi
.vol_id
, c
->vi
.name
,
1612 c
->ro_mount
? ", R/O mode" : "");
1613 x
= (long long)c
->main_lebs
* c
->leb_size
;
1614 y
= (long long)c
->log_lebs
* c
->leb_size
+ c
->max_bud_bytes
;
1615 ubifs_msg("LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
1616 c
->leb_size
, c
->leb_size
>> 10, c
->min_io_size
,
1618 ubifs_msg("FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)",
1619 x
, x
>> 20, c
->main_lebs
,
1620 y
, y
>> 20, c
->log_lebs
+ c
->max_bud_cnt
);
1621 ubifs_msg("reserved for root: %llu bytes (%llu KiB)",
1622 c
->report_rp_size
, c
->report_rp_size
>> 10);
1623 ubifs_msg("media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
1624 c
->fmt_version
, c
->ro_compat_version
,
1625 UBIFS_FORMAT_VERSION
, UBIFS_RO_COMPAT_VERSION
, c
->uuid
,
1626 c
->big_lpt
? ", big LPT model" : ", small LPT model");
1628 dbg_gen("default compressor: %s", ubifs_compr_name(c
->default_compr
));
1629 dbg_gen("data journal heads: %d",
1630 c
->jhead_cnt
- NONDATA_JHEADS_CNT
);
1631 dbg_gen("log LEBs: %d (%d - %d)",
1632 c
->log_lebs
, UBIFS_LOG_LNUM
, c
->log_last
);
1633 dbg_gen("LPT area LEBs: %d (%d - %d)",
1634 c
->lpt_lebs
, c
->lpt_first
, c
->lpt_last
);
1635 dbg_gen("orphan area LEBs: %d (%d - %d)",
1636 c
->orph_lebs
, c
->orph_first
, c
->orph_last
);
1637 dbg_gen("main area LEBs: %d (%d - %d)",
1638 c
->main_lebs
, c
->main_first
, c
->leb_cnt
- 1);
1639 dbg_gen("index LEBs: %d", c
->lst
.idx_lebs
);
1640 dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)",
1641 c
->bi
.old_idx_sz
, c
->bi
.old_idx_sz
>> 10,
1642 c
->bi
.old_idx_sz
>> 20);
1643 dbg_gen("key hash type: %d", c
->key_hash_type
);
1644 dbg_gen("tree fanout: %d", c
->fanout
);
1645 dbg_gen("reserved GC LEB: %d", c
->gc_lnum
);
1646 dbg_gen("max. znode size %d", c
->max_znode_sz
);
1647 dbg_gen("max. index node size %d", c
->max_idx_node_sz
);
1648 dbg_gen("node sizes: data %zu, inode %zu, dentry %zu",
1649 UBIFS_DATA_NODE_SZ
, UBIFS_INO_NODE_SZ
, UBIFS_DENT_NODE_SZ
);
1650 dbg_gen("node sizes: trun %zu, sb %zu, master %zu",
1651 UBIFS_TRUN_NODE_SZ
, UBIFS_SB_NODE_SZ
, UBIFS_MST_NODE_SZ
);
1652 dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu",
1653 UBIFS_REF_NODE_SZ
, UBIFS_CS_NODE_SZ
, UBIFS_ORPH_NODE_SZ
);
1654 dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
1655 UBIFS_MAX_DATA_NODE_SZ
, UBIFS_MAX_INO_NODE_SZ
,
1656 UBIFS_MAX_DENT_NODE_SZ
, ubifs_idx_node_sz(c
, c
->fanout
));
1657 dbg_gen("dead watermark: %d", c
->dead_wm
);
1658 dbg_gen("dark watermark: %d", c
->dark_wm
);
1659 dbg_gen("LEB overhead: %d", c
->leb_overhead
);
1660 x
= (long long)c
->main_lebs
* c
->dark_wm
;
1661 dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)",
1662 x
, x
>> 10, x
>> 20);
1663 dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
1664 c
->max_bud_bytes
, c
->max_bud_bytes
>> 10,
1665 c
->max_bud_bytes
>> 20);
1666 dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
1667 c
->bg_bud_bytes
, c
->bg_bud_bytes
>> 10,
1668 c
->bg_bud_bytes
>> 20);
1669 dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)",
1670 c
->bud_bytes
, c
->bud_bytes
>> 10, c
->bud_bytes
>> 20);
1671 dbg_gen("max. seq. number: %llu", c
->max_sqnum
);
1672 dbg_gen("commit number: %llu", c
->cmt_no
);
1677 spin_lock(&ubifs_infos_lock
);
1678 list_del(&c
->infos_list
);
1679 spin_unlock(&ubifs_infos_lock
);
1687 ubifs_lpt_free(c
, 0);
1690 kfree(c
->rcvrd_mst_node
);
1692 kthread_stop(c
->bgt
);
1700 kfree(c
->write_reserve_buf
);
1704 kfree(c
->bottom_up_buf
);
1705 ubifs_debugging_exit(c
);
1710 * ubifs_umount - un-mount UBIFS file-system.
1711 * @c: UBIFS file-system description object
1713 * Note, this function is called to free allocated resourced when un-mounting,
1714 * as well as free resources when an error occurred while we were half way
1715 * through mounting (error path cleanup function). So it has to make sure the
1716 * resource was actually allocated before freeing it.
1719 static void ubifs_umount(struct ubifs_info
*c
)
1721 void ubifs_umount(struct ubifs_info
*c
)
1724 dbg_gen("un-mounting UBI device %d, volume %d", c
->vi
.ubi_num
,
1727 dbg_debugfs_exit_fs(c
);
1728 spin_lock(&ubifs_infos_lock
);
1729 list_del(&c
->infos_list
);
1730 spin_unlock(&ubifs_infos_lock
);
1734 kthread_stop(c
->bgt
);
1740 ubifs_lpt_free(c
, 0);
1743 kfree(c
->rcvrd_mst_node
);
1745 kfree(c
->write_reserve_buf
);
1749 kfree(c
->bottom_up_buf
);
1750 ubifs_debugging_exit(c
);
1752 /* Finally free U-Boot's global copy of superblock */
1753 if (ubifs_sb
!= NULL
) {
1754 free(ubifs_sb
->s_fs_info
);
1762 * ubifs_remount_rw - re-mount in read-write mode.
1763 * @c: UBIFS file-system description object
1765 * UBIFS avoids allocating many unnecessary resources when mounted in read-only
1766 * mode. This function allocates the needed resources and re-mounts UBIFS in
1769 static int ubifs_remount_rw(struct ubifs_info
*c
)
1773 if (c
->rw_incompat
) {
1774 ubifs_err("the file-system is not R/W-compatible");
1775 ubifs_msg("on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
1776 c
->fmt_version
, c
->ro_compat_version
,
1777 UBIFS_FORMAT_VERSION
, UBIFS_RO_COMPAT_VERSION
);
1781 mutex_lock(&c
->umount_mutex
);
1782 dbg_save_space_info(c
);
1783 c
->remounting_rw
= 1;
1786 if (c
->space_fixup
) {
1787 err
= ubifs_fixup_free_space(c
);
1792 err
= check_free_space(c
);
1796 if (c
->old_leb_cnt
!= c
->leb_cnt
) {
1797 struct ubifs_sb_node
*sup
;
1799 sup
= ubifs_read_sb_node(c
);
1804 sup
->leb_cnt
= cpu_to_le32(c
->leb_cnt
);
1805 err
= ubifs_write_sb_node(c
, sup
);
1811 if (c
->need_recovery
) {
1812 ubifs_msg("completing deferred recovery");
1813 err
= ubifs_write_rcvrd_mst_node(c
);
1816 err
= ubifs_recover_size(c
);
1819 err
= ubifs_clean_lebs(c
, c
->sbuf
);
1822 err
= ubifs_recover_inl_heads(c
, c
->sbuf
);
1826 /* A readonly mount is not allowed to have orphans */
1827 ubifs_assert(c
->tot_orphans
== 0);
1828 err
= ubifs_clear_orphans(c
);
1833 if (!(c
->mst_node
->flags
& cpu_to_le32(UBIFS_MST_DIRTY
))) {
1834 c
->mst_node
->flags
|= cpu_to_le32(UBIFS_MST_DIRTY
);
1835 err
= ubifs_write_master(c
);
1840 c
->ileb_buf
= vmalloc(c
->leb_size
);
1846 c
->write_reserve_buf
= kmalloc(COMPRESSED_DATA_NODE_BUF_SZ
, GFP_KERNEL
);
1847 if (!c
->write_reserve_buf
) {
1852 err
= ubifs_lpt_init(c
, 0, 1);
1856 /* Create background thread */
1857 c
->bgt
= kthread_create(ubifs_bg_thread
, c
, "%s", c
->bgt_name
);
1858 if (IS_ERR(c
->bgt
)) {
1859 err
= PTR_ERR(c
->bgt
);
1861 ubifs_err("cannot spawn \"%s\", error %d",
1865 wake_up_process(c
->bgt
);
1867 c
->orph_buf
= vmalloc(c
->leb_size
);
1873 /* Check for enough log space */
1874 lnum
= c
->lhead_lnum
+ 1;
1875 if (lnum
>= UBIFS_LOG_LNUM
+ c
->log_lebs
)
1876 lnum
= UBIFS_LOG_LNUM
;
1877 if (lnum
== c
->ltail_lnum
) {
1878 err
= ubifs_consolidate_log(c
);
1883 if (c
->need_recovery
)
1884 err
= ubifs_rcvry_gc_commit(c
);
1886 err
= ubifs_leb_unmap(c
, c
->gc_lnum
);
1890 dbg_gen("re-mounted read-write");
1891 c
->remounting_rw
= 0;
1893 if (c
->need_recovery
) {
1894 c
->need_recovery
= 0;
1895 ubifs_msg("deferred recovery completed");
1898 * Do not run the debugging space check if the were doing
1899 * recovery, because when we saved the information we had the
1900 * file-system in a state where the TNC and lprops has been
1901 * modified in memory, but all the I/O operations (including a
1902 * commit) were deferred. So the file-system was in
1903 * "non-committed" state. Now the file-system is in committed
1904 * state, and of course the amount of free space will change
1905 * because, for example, the old index size was imprecise.
1907 err
= dbg_check_space_info(c
);
1910 mutex_unlock(&c
->umount_mutex
);
1918 kthread_stop(c
->bgt
);
1922 kfree(c
->write_reserve_buf
);
1923 c
->write_reserve_buf
= NULL
;
1926 ubifs_lpt_free(c
, 1);
1927 c
->remounting_rw
= 0;
1928 mutex_unlock(&c
->umount_mutex
);
1933 * ubifs_remount_ro - re-mount in read-only mode.
1934 * @c: UBIFS file-system description object
1936 * We assume VFS has stopped writing. Possibly the background thread could be
1937 * running a commit, however kthread_stop will wait in that case.
1939 static void ubifs_remount_ro(struct ubifs_info
*c
)
1943 ubifs_assert(!c
->need_recovery
);
1944 ubifs_assert(!c
->ro_mount
);
1946 mutex_lock(&c
->umount_mutex
);
1948 kthread_stop(c
->bgt
);
1952 dbg_save_space_info(c
);
1954 for (i
= 0; i
< c
->jhead_cnt
; i
++)
1955 ubifs_wbuf_sync(&c
->jheads
[i
].wbuf
);
1957 c
->mst_node
->flags
&= ~cpu_to_le32(UBIFS_MST_DIRTY
);
1958 c
->mst_node
->flags
|= cpu_to_le32(UBIFS_MST_NO_ORPHS
);
1959 c
->mst_node
->gc_lnum
= cpu_to_le32(c
->gc_lnum
);
1960 err
= ubifs_write_master(c
);
1962 ubifs_ro_mode(c
, err
);
1966 kfree(c
->write_reserve_buf
);
1967 c
->write_reserve_buf
= NULL
;
1970 ubifs_lpt_free(c
, 1);
1972 err
= dbg_check_space_info(c
);
1974 ubifs_ro_mode(c
, err
);
1975 mutex_unlock(&c
->umount_mutex
);
1978 static void ubifs_put_super(struct super_block
*sb
)
1981 struct ubifs_info
*c
= sb
->s_fs_info
;
1983 ubifs_msg("un-mount UBI device %d, volume %d", c
->vi
.ubi_num
,
1987 * The following asserts are only valid if there has not been a failure
1988 * of the media. For example, there will be dirty inodes if we failed
1989 * to write them back because of I/O errors.
1992 ubifs_assert(c
->bi
.idx_growth
== 0);
1993 ubifs_assert(c
->bi
.dd_growth
== 0);
1994 ubifs_assert(c
->bi
.data_growth
== 0);
1998 * The 'c->umount_lock' prevents races between UBIFS memory shrinker
1999 * and file system un-mount. Namely, it prevents the shrinker from
2000 * picking this superblock for shrinking - it will be just skipped if
2001 * the mutex is locked.
2003 mutex_lock(&c
->umount_mutex
);
2006 * First of all kill the background thread to make sure it does
2007 * not interfere with un-mounting and freeing resources.
2010 kthread_stop(c
->bgt
);
2015 * On fatal errors c->ro_error is set to 1, in which case we do
2016 * not write the master node.
2021 /* Synchronize write-buffers */
2022 for (i
= 0; i
< c
->jhead_cnt
; i
++)
2023 ubifs_wbuf_sync(&c
->jheads
[i
].wbuf
);
2026 * We are being cleanly unmounted which means the
2027 * orphans were killed - indicate this in the master
2028 * node. Also save the reserved GC LEB number.
2030 c
->mst_node
->flags
&= ~cpu_to_le32(UBIFS_MST_DIRTY
);
2031 c
->mst_node
->flags
|= cpu_to_le32(UBIFS_MST_NO_ORPHS
);
2032 c
->mst_node
->gc_lnum
= cpu_to_le32(c
->gc_lnum
);
2033 err
= ubifs_write_master(c
);
2036 * Recovery will attempt to fix the master area
2037 * next mount, so we just print a message and
2038 * continue to unmount normally.
2040 ubifs_err("failed to write master node, error %d",
2044 for (i
= 0; i
< c
->jhead_cnt
; i
++)
2045 /* Make sure write-buffer timers are canceled */
2046 hrtimer_cancel(&c
->jheads
[i
].wbuf
.timer
);
2053 bdi_destroy(&c
->bdi
);
2055 ubi_close_volume(c
->ubi
);
2056 mutex_unlock(&c
->umount_mutex
);
2061 static int ubifs_remount_fs(struct super_block
*sb
, int *flags
, char *data
)
2064 struct ubifs_info
*c
= sb
->s_fs_info
;
2066 dbg_gen("old flags %#lx, new flags %#x", sb
->s_flags
, *flags
);
2068 err
= ubifs_parse_options(c
, data
, 1);
2070 ubifs_err("invalid or unknown remount parameter");
2074 if (c
->ro_mount
&& !(*flags
& MS_RDONLY
)) {
2076 ubifs_msg("cannot re-mount R/W due to prior errors");
2080 ubifs_msg("cannot re-mount R/W - UBI volume is R/O");
2083 err
= ubifs_remount_rw(c
);
2086 } else if (!c
->ro_mount
&& (*flags
& MS_RDONLY
)) {
2088 ubifs_msg("cannot re-mount R/O due to prior errors");
2091 ubifs_remount_ro(c
);
2094 if (c
->bulk_read
== 1)
2097 dbg_gen("disable bulk-read");
2102 ubifs_assert(c
->lst
.taken_empty_lebs
> 0);
2107 const struct super_operations ubifs_super_operations
= {
2108 .alloc_inode
= ubifs_alloc_inode
,
2110 .destroy_inode
= ubifs_destroy_inode
,
2111 .put_super
= ubifs_put_super
,
2112 .write_inode
= ubifs_write_inode
,
2113 .evict_inode
= ubifs_evict_inode
,
2114 .statfs
= ubifs_statfs
,
2116 .dirty_inode
= ubifs_dirty_inode
,
2118 .remount_fs
= ubifs_remount_fs
,
2119 .show_options
= ubifs_show_options
,
2120 .sync_fs
= ubifs_sync_fs
,
2125 * open_ubi - parse UBI device name string and open the UBI device.
2126 * @name: UBI volume name
2127 * @mode: UBI volume open mode
2129 * The primary method of mounting UBIFS is by specifying the UBI volume
2130 * character device node path. However, UBIFS may also be mounted withoug any
2131 * character device node using one of the following methods:
2133 * o ubiX_Y - mount UBI device number X, volume Y;
2134 * o ubiY - mount UBI device number 0, volume Y;
2135 * o ubiX:NAME - mount UBI device X, volume with name NAME;
2136 * o ubi:NAME - mount UBI device 0, volume with name NAME.
2138 * Alternative '!' separator may be used instead of ':' (because some shells
2139 * like busybox may interpret ':' as an NFS host name separator). This function
2140 * returns UBI volume description object in case of success and a negative
2141 * error code in case of failure.
2143 static struct ubi_volume_desc
*open_ubi(const char *name
, int mode
)
2146 struct ubi_volume_desc
*ubi
;
2152 /* First, try to open using the device node path method */
2153 ubi
= ubi_open_volume_path(name
, mode
);
2158 /* Try the "nodev" method */
2159 if (name
[0] != 'u' || name
[1] != 'b' || name
[2] != 'i')
2160 return ERR_PTR(-EINVAL
);
2162 /* ubi:NAME method */
2163 if ((name
[3] == ':' || name
[3] == '!') && name
[4] != '\0')
2164 return ubi_open_volume_nm(0, name
+ 4, mode
);
2166 if (!isdigit(name
[3]))
2167 return ERR_PTR(-EINVAL
);
2169 dev
= simple_strtoul(name
+ 3, &endptr
, 0);
2172 if (*endptr
== '\0')
2173 return ubi_open_volume(0, dev
, mode
);
2176 if (*endptr
== '_' && isdigit(endptr
[1])) {
2177 vol
= simple_strtoul(endptr
+ 1, &endptr
, 0);
2178 if (*endptr
!= '\0')
2179 return ERR_PTR(-EINVAL
);
2180 return ubi_open_volume(dev
, vol
, mode
);
2183 /* ubiX:NAME method */
2184 if ((*endptr
== ':' || *endptr
== '!') && endptr
[1] != '\0')
2185 return ubi_open_volume_nm(dev
, ++endptr
, mode
);
2187 return ERR_PTR(-EINVAL
);
2190 static struct ubifs_info
*alloc_ubifs_info(struct ubi_volume_desc
*ubi
)
2192 struct ubifs_info
*c
;
2194 c
= kzalloc(sizeof(struct ubifs_info
), GFP_KERNEL
);
2196 spin_lock_init(&c
->cnt_lock
);
2197 spin_lock_init(&c
->cs_lock
);
2198 spin_lock_init(&c
->buds_lock
);
2199 spin_lock_init(&c
->space_lock
);
2200 spin_lock_init(&c
->orphan_lock
);
2201 init_rwsem(&c
->commit_sem
);
2202 mutex_init(&c
->lp_mutex
);
2203 mutex_init(&c
->tnc_mutex
);
2204 mutex_init(&c
->log_mutex
);
2205 mutex_init(&c
->mst_mutex
);
2206 mutex_init(&c
->umount_mutex
);
2207 mutex_init(&c
->bu_mutex
);
2208 mutex_init(&c
->write_reserve_mutex
);
2209 init_waitqueue_head(&c
->cmt_wq
);
2211 c
->old_idx
= RB_ROOT
;
2212 c
->size_tree
= RB_ROOT
;
2213 c
->orph_tree
= RB_ROOT
;
2214 INIT_LIST_HEAD(&c
->infos_list
);
2215 INIT_LIST_HEAD(&c
->idx_gc
);
2216 INIT_LIST_HEAD(&c
->replay_list
);
2217 INIT_LIST_HEAD(&c
->replay_buds
);
2218 INIT_LIST_HEAD(&c
->uncat_list
);
2219 INIT_LIST_HEAD(&c
->empty_list
);
2220 INIT_LIST_HEAD(&c
->freeable_list
);
2221 INIT_LIST_HEAD(&c
->frdi_idx_list
);
2222 INIT_LIST_HEAD(&c
->unclean_leb_list
);
2223 INIT_LIST_HEAD(&c
->old_buds
);
2224 INIT_LIST_HEAD(&c
->orph_list
);
2225 INIT_LIST_HEAD(&c
->orph_new
);
2226 c
->no_chk_data_crc
= 1;
2228 c
->highest_inum
= UBIFS_FIRST_INO
;
2229 c
->lhead_lnum
= c
->ltail_lnum
= UBIFS_LOG_LNUM
;
2231 ubi_get_volume_info(ubi
, &c
->vi
);
2232 ubi_get_device_info(c
->vi
.ubi_num
, &c
->di
);
2237 static int ubifs_fill_super(struct super_block
*sb
, void *data
, int silent
)
2239 struct ubifs_info
*c
= sb
->s_fs_info
;
2244 /* Re-open the UBI device in read-write mode */
2245 c
->ubi
= ubi_open_volume(c
->vi
.ubi_num
, c
->vi
.vol_id
, UBI_READWRITE
);
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
));