2 * This file is part of UBIFS.
4 * Copyright (C) 2006-2008 Nokia Corporation.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Authors: Artem Bityutskiy (Битюцкий Артём)
24 * This file implements UBIFS initialization and VFS superblock operations. Some
25 * initialization stuff which is rather large and complex is placed at
26 * corresponding subsystems, but most of it is here.
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/module.h>
32 #include <linux/ctype.h>
33 #include <linux/kthread.h>
34 #include <linux/parser.h>
35 #include <linux/seq_file.h>
36 #include <linux/mount.h>
37 #include <linux/math64.h>
38 #include <linux/writeback.h>
42 * Maximum amount of memory we may 'kmalloc()' without worrying that we are
43 * allocating too much.
45 #define UBIFS_KMALLOC_OK (128*1024)
47 /* Slab cache for UBIFS inodes */
48 static struct kmem_cache
*ubifs_inode_slab
;
50 /* UBIFS TNC shrinker description */
51 static struct shrinker ubifs_shrinker_info
= {
52 .scan_objects
= ubifs_shrink_scan
,
53 .count_objects
= ubifs_shrink_count
,
54 .seeks
= DEFAULT_SEEKS
,
58 * validate_inode - validate inode.
59 * @c: UBIFS file-system description object
60 * @inode: the inode to validate
62 * This is a helper function for 'ubifs_iget()' which validates various fields
63 * of a newly built inode to make sure they contain sane values and prevent
64 * possible vulnerabilities. Returns zero if the inode is all right and
65 * a non-zero error code if not.
67 static int validate_inode(struct ubifs_info
*c
, const struct inode
*inode
)
70 const struct ubifs_inode
*ui
= ubifs_inode(inode
);
72 if (inode
->i_size
> c
->max_inode_sz
) {
73 ubifs_err(c
, "inode is too large (%lld)",
74 (long long)inode
->i_size
);
78 if (ui
->compr_type
>= UBIFS_COMPR_TYPES_CNT
) {
79 ubifs_err(c
, "unknown compression type %d", ui
->compr_type
);
83 if (ui
->xattr_names
+ ui
->xattr_cnt
> XATTR_LIST_MAX
)
86 if (ui
->data_len
< 0 || ui
->data_len
> UBIFS_MAX_INO_DATA
)
89 if (ui
->xattr
&& !S_ISREG(inode
->i_mode
))
92 if (!ubifs_compr_present(c
, ui
->compr_type
)) {
93 ubifs_warn(c
, "inode %lu uses '%s' compression, but it was not compiled in",
94 inode
->i_ino
, ubifs_compr_name(c
, ui
->compr_type
));
97 err
= dbg_check_dir(c
, inode
);
101 struct inode
*ubifs_iget(struct super_block
*sb
, unsigned long inum
)
105 struct ubifs_ino_node
*ino
;
106 struct ubifs_info
*c
= sb
->s_fs_info
;
108 struct ubifs_inode
*ui
;
110 dbg_gen("inode %lu", inum
);
112 inode
= iget_locked(sb
, inum
);
114 return ERR_PTR(-ENOMEM
);
115 if (!(inode
->i_state
& I_NEW
))
117 ui
= ubifs_inode(inode
);
119 ino
= kmalloc(UBIFS_MAX_INO_NODE_SZ
, GFP_NOFS
);
125 ino_key_init(c
, &key
, inode
->i_ino
);
127 err
= ubifs_tnc_lookup(c
, &key
, ino
);
131 inode
->i_flags
|= S_NOCMTIME
;
132 #ifndef CONFIG_UBIFS_ATIME_SUPPORT
133 inode
->i_flags
|= S_NOATIME
;
135 set_nlink(inode
, le32_to_cpu(ino
->nlink
));
136 i_uid_write(inode
, le32_to_cpu(ino
->uid
));
137 i_gid_write(inode
, le32_to_cpu(ino
->gid
));
138 inode
->i_atime
.tv_sec
= (int64_t)le64_to_cpu(ino
->atime_sec
);
139 inode
->i_atime
.tv_nsec
= le32_to_cpu(ino
->atime_nsec
);
140 inode
->i_mtime
.tv_sec
= (int64_t)le64_to_cpu(ino
->mtime_sec
);
141 inode
->i_mtime
.tv_nsec
= le32_to_cpu(ino
->mtime_nsec
);
142 inode
->i_ctime
.tv_sec
= (int64_t)le64_to_cpu(ino
->ctime_sec
);
143 inode
->i_ctime
.tv_nsec
= le32_to_cpu(ino
->ctime_nsec
);
144 inode
->i_mode
= le32_to_cpu(ino
->mode
);
145 inode
->i_size
= le64_to_cpu(ino
->size
);
147 ui
->data_len
= le32_to_cpu(ino
->data_len
);
148 ui
->flags
= le32_to_cpu(ino
->flags
);
149 ui
->compr_type
= le16_to_cpu(ino
->compr_type
);
150 ui
->creat_sqnum
= le64_to_cpu(ino
->creat_sqnum
);
151 ui
->xattr_cnt
= le32_to_cpu(ino
->xattr_cnt
);
152 ui
->xattr_size
= le32_to_cpu(ino
->xattr_size
);
153 ui
->xattr_names
= le32_to_cpu(ino
->xattr_names
);
154 ui
->synced_i_size
= ui
->ui_size
= inode
->i_size
;
156 ui
->xattr
= (ui
->flags
& UBIFS_XATTR_FL
) ? 1 : 0;
158 err
= validate_inode(c
, inode
);
162 switch (inode
->i_mode
& S_IFMT
) {
164 inode
->i_mapping
->a_ops
= &ubifs_file_address_operations
;
165 inode
->i_op
= &ubifs_file_inode_operations
;
166 inode
->i_fop
= &ubifs_file_operations
;
168 ui
->data
= kmalloc(ui
->data_len
+ 1, GFP_NOFS
);
173 memcpy(ui
->data
, ino
->data
, ui
->data_len
);
174 ((char *)ui
->data
)[ui
->data_len
] = '\0';
175 } else if (ui
->data_len
!= 0) {
181 inode
->i_op
= &ubifs_dir_inode_operations
;
182 inode
->i_fop
= &ubifs_dir_operations
;
183 if (ui
->data_len
!= 0) {
189 inode
->i_op
= &ubifs_symlink_inode_operations
;
190 if (ui
->data_len
<= 0 || ui
->data_len
> UBIFS_MAX_INO_DATA
) {
194 ui
->data
= kmalloc(ui
->data_len
+ 1, GFP_NOFS
);
199 memcpy(ui
->data
, ino
->data
, ui
->data_len
);
200 ((char *)ui
->data
)[ui
->data_len
] = '\0';
206 union ubifs_dev_desc
*dev
;
208 ui
->data
= kmalloc(sizeof(union ubifs_dev_desc
), GFP_NOFS
);
214 dev
= (union ubifs_dev_desc
*)ino
->data
;
215 if (ui
->data_len
== sizeof(dev
->new))
216 rdev
= new_decode_dev(le32_to_cpu(dev
->new));
217 else if (ui
->data_len
== sizeof(dev
->huge
))
218 rdev
= huge_decode_dev(le64_to_cpu(dev
->huge
));
223 memcpy(ui
->data
, ino
->data
, ui
->data_len
);
224 inode
->i_op
= &ubifs_file_inode_operations
;
225 init_special_inode(inode
, inode
->i_mode
, rdev
);
230 inode
->i_op
= &ubifs_file_inode_operations
;
231 init_special_inode(inode
, inode
->i_mode
, 0);
232 if (ui
->data_len
!= 0) {
243 ubifs_set_inode_flags(inode
);
244 unlock_new_inode(inode
);
248 ubifs_err(c
, "inode %lu validation failed, error %d", inode
->i_ino
, err
);
249 ubifs_dump_node(c
, ino
);
250 ubifs_dump_inode(c
, inode
);
255 ubifs_err(c
, "failed to read inode %lu, error %d", inode
->i_ino
, err
);
260 static struct inode
*ubifs_alloc_inode(struct super_block
*sb
)
262 struct ubifs_inode
*ui
;
264 ui
= kmem_cache_alloc(ubifs_inode_slab
, GFP_NOFS
);
268 memset((void *)ui
+ sizeof(struct inode
), 0,
269 sizeof(struct ubifs_inode
) - sizeof(struct inode
));
270 mutex_init(&ui
->ui_mutex
);
271 spin_lock_init(&ui
->ui_lock
);
272 return &ui
->vfs_inode
;
275 static void ubifs_free_inode(struct inode
*inode
)
277 struct ubifs_inode
*ui
= ubifs_inode(inode
);
280 fscrypt_free_inode(inode
);
282 kmem_cache_free(ubifs_inode_slab
, ui
);
286 * Note, Linux write-back code calls this without 'i_mutex'.
288 static int ubifs_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
291 struct ubifs_info
*c
= inode
->i_sb
->s_fs_info
;
292 struct ubifs_inode
*ui
= ubifs_inode(inode
);
294 ubifs_assert(c
, !ui
->xattr
);
295 if (is_bad_inode(inode
))
298 mutex_lock(&ui
->ui_mutex
);
300 * Due to races between write-back forced by budgeting
301 * (see 'sync_some_inodes()') and background write-back, the inode may
302 * have already been synchronized, do not do this again. This might
303 * also happen if it was synchronized in an VFS operation, e.g.
307 mutex_unlock(&ui
->ui_mutex
);
312 * As an optimization, do not write orphan inodes to the media just
313 * because this is not needed.
315 dbg_gen("inode %lu, mode %#x, nlink %u",
316 inode
->i_ino
, (int)inode
->i_mode
, inode
->i_nlink
);
317 if (inode
->i_nlink
) {
318 err
= ubifs_jnl_write_inode(c
, inode
);
320 ubifs_err(c
, "can't write inode %lu, error %d",
323 err
= dbg_check_inode_size(c
, inode
, ui
->ui_size
);
327 mutex_unlock(&ui
->ui_mutex
);
328 ubifs_release_dirty_inode_budget(c
, ui
);
332 static void ubifs_evict_inode(struct inode
*inode
)
335 struct ubifs_info
*c
= inode
->i_sb
->s_fs_info
;
336 struct ubifs_inode
*ui
= ubifs_inode(inode
);
340 * Extended attribute inode deletions are fully handled in
341 * 'ubifs_removexattr()'. These inodes are special and have
342 * limited usage, so there is nothing to do here.
346 dbg_gen("inode %lu, mode %#x", inode
->i_ino
, (int)inode
->i_mode
);
347 ubifs_assert(c
, !atomic_read(&inode
->i_count
));
349 truncate_inode_pages_final(&inode
->i_data
);
354 if (is_bad_inode(inode
))
357 ui
->ui_size
= inode
->i_size
= 0;
358 err
= ubifs_jnl_delete_inode(c
, inode
);
361 * Worst case we have a lost orphan inode wasting space, so a
362 * simple error message is OK here.
364 ubifs_err(c
, "can't delete inode %lu, error %d",
369 ubifs_release_dirty_inode_budget(c
, ui
);
371 /* We've deleted something - clean the "no space" flags */
372 c
->bi
.nospace
= c
->bi
.nospace_rp
= 0;
377 fscrypt_put_encryption_info(inode
);
380 static void ubifs_dirty_inode(struct inode
*inode
, int flags
)
382 struct ubifs_info
*c
= inode
->i_sb
->s_fs_info
;
383 struct ubifs_inode
*ui
= ubifs_inode(inode
);
385 ubifs_assert(c
, mutex_is_locked(&ui
->ui_mutex
));
388 dbg_gen("inode %lu", inode
->i_ino
);
392 static int ubifs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
394 struct ubifs_info
*c
= dentry
->d_sb
->s_fs_info
;
395 unsigned long long free
;
396 __le32
*uuid
= (__le32
*)c
->uuid
;
398 free
= ubifs_get_free_space(c
);
399 dbg_gen("free space %lld bytes (%lld blocks)",
400 free
, free
>> UBIFS_BLOCK_SHIFT
);
402 buf
->f_type
= UBIFS_SUPER_MAGIC
;
403 buf
->f_bsize
= UBIFS_BLOCK_SIZE
;
404 buf
->f_blocks
= c
->block_cnt
;
405 buf
->f_bfree
= free
>> UBIFS_BLOCK_SHIFT
;
406 if (free
> c
->report_rp_size
)
407 buf
->f_bavail
= (free
- c
->report_rp_size
) >> UBIFS_BLOCK_SHIFT
;
412 buf
->f_namelen
= UBIFS_MAX_NLEN
;
413 buf
->f_fsid
.val
[0] = le32_to_cpu(uuid
[0]) ^ le32_to_cpu(uuid
[2]);
414 buf
->f_fsid
.val
[1] = le32_to_cpu(uuid
[1]) ^ le32_to_cpu(uuid
[3]);
415 ubifs_assert(c
, buf
->f_bfree
<= c
->block_cnt
);
419 static int ubifs_show_options(struct seq_file
*s
, struct dentry
*root
)
421 struct ubifs_info
*c
= root
->d_sb
->s_fs_info
;
423 if (c
->mount_opts
.unmount_mode
== 2)
424 seq_puts(s
, ",fast_unmount");
425 else if (c
->mount_opts
.unmount_mode
== 1)
426 seq_puts(s
, ",norm_unmount");
428 if (c
->mount_opts
.bulk_read
== 2)
429 seq_puts(s
, ",bulk_read");
430 else if (c
->mount_opts
.bulk_read
== 1)
431 seq_puts(s
, ",no_bulk_read");
433 if (c
->mount_opts
.chk_data_crc
== 2)
434 seq_puts(s
, ",chk_data_crc");
435 else if (c
->mount_opts
.chk_data_crc
== 1)
436 seq_puts(s
, ",no_chk_data_crc");
438 if (c
->mount_opts
.override_compr
) {
439 seq_printf(s
, ",compr=%s",
440 ubifs_compr_name(c
, c
->mount_opts
.compr_type
));
443 seq_printf(s
, ",assert=%s", ubifs_assert_action_name(c
));
444 seq_printf(s
, ",ubi=%d,vol=%d", c
->vi
.ubi_num
, c
->vi
.vol_id
);
449 static int ubifs_sync_fs(struct super_block
*sb
, int wait
)
452 struct ubifs_info
*c
= sb
->s_fs_info
;
455 * Zero @wait is just an advisory thing to help the file system shove
456 * lots of data into the queues, and there will be the second
457 * '->sync_fs()' call, with non-zero @wait.
463 * Synchronize write buffers, because 'ubifs_run_commit()' does not
464 * do this if it waits for an already running commit.
466 for (i
= 0; i
< c
->jhead_cnt
; i
++) {
467 err
= ubifs_wbuf_sync(&c
->jheads
[i
].wbuf
);
473 * Strictly speaking, it is not necessary to commit the journal here,
474 * synchronizing write-buffers would be enough. But committing makes
475 * UBIFS free space predictions much more accurate, so we want to let
476 * the user be able to get more accurate results of 'statfs()' after
477 * they synchronize the file system.
479 err
= ubifs_run_commit(c
);
483 return ubi_sync(c
->vi
.ubi_num
);
487 * init_constants_early - initialize UBIFS constants.
488 * @c: UBIFS file-system description object
490 * This function initialize UBIFS constants which do not need the superblock to
491 * be read. It also checks that the UBI volume satisfies basic UBIFS
492 * requirements. Returns zero in case of success and a negative error code in
495 static int init_constants_early(struct ubifs_info
*c
)
497 if (c
->vi
.corrupted
) {
498 ubifs_warn(c
, "UBI volume is corrupted - read-only mode");
503 ubifs_msg(c
, "read-only UBI device");
507 if (c
->vi
.vol_type
== UBI_STATIC_VOLUME
) {
508 ubifs_msg(c
, "static UBI volume - read-only mode");
512 c
->leb_cnt
= c
->vi
.size
;
513 c
->leb_size
= c
->vi
.usable_leb_size
;
514 c
->leb_start
= c
->di
.leb_start
;
515 c
->half_leb_size
= c
->leb_size
/ 2;
516 c
->min_io_size
= c
->di
.min_io_size
;
517 c
->min_io_shift
= fls(c
->min_io_size
) - 1;
518 c
->max_write_size
= c
->di
.max_write_size
;
519 c
->max_write_shift
= fls(c
->max_write_size
) - 1;
521 if (c
->leb_size
< UBIFS_MIN_LEB_SZ
) {
522 ubifs_errc(c
, "too small LEBs (%d bytes), min. is %d bytes",
523 c
->leb_size
, UBIFS_MIN_LEB_SZ
);
527 if (c
->leb_cnt
< UBIFS_MIN_LEB_CNT
) {
528 ubifs_errc(c
, "too few LEBs (%d), min. is %d",
529 c
->leb_cnt
, UBIFS_MIN_LEB_CNT
);
533 if (!is_power_of_2(c
->min_io_size
)) {
534 ubifs_errc(c
, "bad min. I/O size %d", c
->min_io_size
);
539 * Maximum write size has to be greater or equivalent to min. I/O
540 * size, and be multiple of min. I/O size.
542 if (c
->max_write_size
< c
->min_io_size
||
543 c
->max_write_size
% c
->min_io_size
||
544 !is_power_of_2(c
->max_write_size
)) {
545 ubifs_errc(c
, "bad write buffer size %d for %d min. I/O unit",
546 c
->max_write_size
, c
->min_io_size
);
551 * UBIFS aligns all node to 8-byte boundary, so to make function in
552 * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
555 if (c
->min_io_size
< 8) {
558 if (c
->max_write_size
< c
->min_io_size
) {
559 c
->max_write_size
= c
->min_io_size
;
560 c
->max_write_shift
= c
->min_io_shift
;
564 c
->ref_node_alsz
= ALIGN(UBIFS_REF_NODE_SZ
, c
->min_io_size
);
565 c
->mst_node_alsz
= ALIGN(UBIFS_MST_NODE_SZ
, c
->min_io_size
);
568 * Initialize node length ranges which are mostly needed for node
571 c
->ranges
[UBIFS_PAD_NODE
].len
= UBIFS_PAD_NODE_SZ
;
572 c
->ranges
[UBIFS_SB_NODE
].len
= UBIFS_SB_NODE_SZ
;
573 c
->ranges
[UBIFS_MST_NODE
].len
= UBIFS_MST_NODE_SZ
;
574 c
->ranges
[UBIFS_REF_NODE
].len
= UBIFS_REF_NODE_SZ
;
575 c
->ranges
[UBIFS_TRUN_NODE
].len
= UBIFS_TRUN_NODE_SZ
;
576 c
->ranges
[UBIFS_CS_NODE
].len
= UBIFS_CS_NODE_SZ
;
577 c
->ranges
[UBIFS_AUTH_NODE
].min_len
= UBIFS_AUTH_NODE_SZ
;
578 c
->ranges
[UBIFS_AUTH_NODE
].max_len
= UBIFS_AUTH_NODE_SZ
+
581 c
->ranges
[UBIFS_INO_NODE
].min_len
= UBIFS_INO_NODE_SZ
;
582 c
->ranges
[UBIFS_INO_NODE
].max_len
= UBIFS_MAX_INO_NODE_SZ
;
583 c
->ranges
[UBIFS_ORPH_NODE
].min_len
=
584 UBIFS_ORPH_NODE_SZ
+ sizeof(__le64
);
585 c
->ranges
[UBIFS_ORPH_NODE
].max_len
= c
->leb_size
;
586 c
->ranges
[UBIFS_DENT_NODE
].min_len
= UBIFS_DENT_NODE_SZ
;
587 c
->ranges
[UBIFS_DENT_NODE
].max_len
= UBIFS_MAX_DENT_NODE_SZ
;
588 c
->ranges
[UBIFS_XENT_NODE
].min_len
= UBIFS_XENT_NODE_SZ
;
589 c
->ranges
[UBIFS_XENT_NODE
].max_len
= UBIFS_MAX_XENT_NODE_SZ
;
590 c
->ranges
[UBIFS_DATA_NODE
].min_len
= UBIFS_DATA_NODE_SZ
;
591 c
->ranges
[UBIFS_DATA_NODE
].max_len
= UBIFS_MAX_DATA_NODE_SZ
;
593 * Minimum indexing node size is amended later when superblock is
594 * read and the key length is known.
596 c
->ranges
[UBIFS_IDX_NODE
].min_len
= UBIFS_IDX_NODE_SZ
+ UBIFS_BRANCH_SZ
;
598 * Maximum indexing node size is amended later when superblock is
599 * read and the fanout is known.
601 c
->ranges
[UBIFS_IDX_NODE
].max_len
= INT_MAX
;
604 * Initialize dead and dark LEB space watermarks. See gc.c for comments
605 * about these values.
607 c
->dead_wm
= ALIGN(MIN_WRITE_SZ
, c
->min_io_size
);
608 c
->dark_wm
= ALIGN(UBIFS_MAX_NODE_SZ
, c
->min_io_size
);
611 * Calculate how many bytes would be wasted at the end of LEB if it was
612 * fully filled with data nodes of maximum size. This is used in
613 * calculations when reporting free space.
615 c
->leb_overhead
= c
->leb_size
% UBIFS_MAX_DATA_NODE_SZ
;
617 /* Buffer size for bulk-reads */
618 c
->max_bu_buf_len
= UBIFS_MAX_BULK_READ
* UBIFS_MAX_DATA_NODE_SZ
;
619 if (c
->max_bu_buf_len
> c
->leb_size
)
620 c
->max_bu_buf_len
= c
->leb_size
;
625 * bud_wbuf_callback - bud LEB write-buffer synchronization call-back.
626 * @c: UBIFS file-system description object
627 * @lnum: LEB the write-buffer was synchronized to
628 * @free: how many free bytes left in this LEB
629 * @pad: how many bytes were padded
631 * This is a callback function which is called by the I/O unit when the
632 * write-buffer is synchronized. We need this to correctly maintain space
633 * accounting in bud logical eraseblocks. This function returns zero in case of
634 * success and a negative error code in case of failure.
636 * This function actually belongs to the journal, but we keep it here because
637 * we want to keep it static.
639 static int bud_wbuf_callback(struct ubifs_info
*c
, int lnum
, int free
, int pad
)
641 return ubifs_update_one_lp(c
, lnum
, free
, pad
, 0, 0);
645 * init_constants_sb - initialize UBIFS constants.
646 * @c: UBIFS file-system description object
648 * This is a helper function which initializes various UBIFS constants after
649 * the superblock has been read. It also checks various UBIFS parameters and
650 * makes sure they are all right. Returns zero in case of success and a
651 * negative error code in case of failure.
653 static int init_constants_sb(struct ubifs_info
*c
)
658 c
->main_bytes
= (long long)c
->main_lebs
* c
->leb_size
;
659 c
->max_znode_sz
= sizeof(struct ubifs_znode
) +
660 c
->fanout
* sizeof(struct ubifs_zbranch
);
662 tmp
= ubifs_idx_node_sz(c
, 1);
663 c
->ranges
[UBIFS_IDX_NODE
].min_len
= tmp
;
664 c
->min_idx_node_sz
= ALIGN(tmp
, 8);
666 tmp
= ubifs_idx_node_sz(c
, c
->fanout
);
667 c
->ranges
[UBIFS_IDX_NODE
].max_len
= tmp
;
668 c
->max_idx_node_sz
= ALIGN(tmp
, 8);
670 /* Make sure LEB size is large enough to fit full commit */
671 tmp
= UBIFS_CS_NODE_SZ
+ UBIFS_REF_NODE_SZ
* c
->jhead_cnt
;
672 tmp
= ALIGN(tmp
, c
->min_io_size
);
673 if (tmp
> c
->leb_size
) {
674 ubifs_err(c
, "too small LEB size %d, at least %d needed",
680 * Make sure that the log is large enough to fit reference nodes for
681 * all buds plus one reserved LEB.
683 tmp64
= c
->max_bud_bytes
+ c
->leb_size
- 1;
684 c
->max_bud_cnt
= div_u64(tmp64
, c
->leb_size
);
685 tmp
= (c
->ref_node_alsz
* c
->max_bud_cnt
+ c
->leb_size
- 1);
688 if (c
->log_lebs
< tmp
) {
689 ubifs_err(c
, "too small log %d LEBs, required min. %d LEBs",
695 * When budgeting we assume worst-case scenarios when the pages are not
696 * be compressed and direntries are of the maximum size.
698 * Note, data, which may be stored in inodes is budgeted separately, so
699 * it is not included into 'c->bi.inode_budget'.
701 c
->bi
.page_budget
= UBIFS_MAX_DATA_NODE_SZ
* UBIFS_BLOCKS_PER_PAGE
;
702 c
->bi
.inode_budget
= UBIFS_INO_NODE_SZ
;
703 c
->bi
.dent_budget
= UBIFS_MAX_DENT_NODE_SZ
;
706 * When the amount of flash space used by buds becomes
707 * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit.
708 * The writers are unblocked when the commit is finished. To avoid
709 * writers to be blocked UBIFS initiates background commit in advance,
710 * when number of bud bytes becomes above the limit defined below.
712 c
->bg_bud_bytes
= (c
->max_bud_bytes
* 13) >> 4;
715 * Ensure minimum journal size. All the bytes in the journal heads are
716 * considered to be used, when calculating the current journal usage.
717 * Consequently, if the journal is too small, UBIFS will treat it as
720 tmp64
= (long long)(c
->jhead_cnt
+ 1) * c
->leb_size
+ 1;
721 if (c
->bg_bud_bytes
< tmp64
)
722 c
->bg_bud_bytes
= tmp64
;
723 if (c
->max_bud_bytes
< tmp64
+ c
->leb_size
)
724 c
->max_bud_bytes
= tmp64
+ c
->leb_size
;
726 err
= ubifs_calc_lpt_geom(c
);
730 /* Initialize effective LEB size used in budgeting calculations */
731 c
->idx_leb_size
= c
->leb_size
- c
->max_idx_node_sz
;
736 * init_constants_master - initialize UBIFS constants.
737 * @c: UBIFS file-system description object
739 * This is a helper function which initializes various UBIFS constants after
740 * the master node has been read. It also checks various UBIFS parameters and
741 * makes sure they are all right.
743 static void init_constants_master(struct ubifs_info
*c
)
747 c
->bi
.min_idx_lebs
= ubifs_calc_min_idx_lebs(c
);
748 c
->report_rp_size
= ubifs_reported_space(c
, c
->rp_size
);
751 * Calculate total amount of FS blocks. This number is not used
752 * internally because it does not make much sense for UBIFS, but it is
753 * necessary to report something for the 'statfs()' call.
755 * Subtract the LEB reserved for GC, the LEB which is reserved for
756 * deletions, minimum LEBs for the index, and assume only one journal
759 tmp64
= c
->main_lebs
- 1 - 1 - MIN_INDEX_LEBS
- c
->jhead_cnt
+ 1;
760 tmp64
*= (long long)c
->leb_size
- c
->leb_overhead
;
761 tmp64
= ubifs_reported_space(c
, tmp64
);
762 c
->block_cnt
= tmp64
>> UBIFS_BLOCK_SHIFT
;
766 * take_gc_lnum - reserve GC LEB.
767 * @c: UBIFS file-system description object
769 * This function ensures that the LEB reserved for garbage collection is marked
770 * as "taken" in lprops. We also have to set free space to LEB size and dirty
771 * space to zero, because lprops may contain out-of-date information if the
772 * file-system was un-mounted before it has been committed. This function
773 * returns zero in case of success and a negative error code in case of
776 static int take_gc_lnum(struct ubifs_info
*c
)
780 if (c
->gc_lnum
== -1) {
781 ubifs_err(c
, "no LEB for GC");
785 /* And we have to tell lprops that this LEB is taken */
786 err
= ubifs_change_one_lp(c
, c
->gc_lnum
, c
->leb_size
, 0,
792 * alloc_wbufs - allocate write-buffers.
793 * @c: UBIFS file-system description object
795 * This helper function allocates and initializes UBIFS write-buffers. Returns
796 * zero in case of success and %-ENOMEM in case of failure.
798 static int alloc_wbufs(struct ubifs_info
*c
)
802 c
->jheads
= kcalloc(c
->jhead_cnt
, sizeof(struct ubifs_jhead
),
807 /* Initialize journal heads */
808 for (i
= 0; i
< c
->jhead_cnt
; i
++) {
809 INIT_LIST_HEAD(&c
->jheads
[i
].buds_list
);
810 err
= ubifs_wbuf_init(c
, &c
->jheads
[i
].wbuf
);
814 c
->jheads
[i
].wbuf
.sync_callback
= &bud_wbuf_callback
;
815 c
->jheads
[i
].wbuf
.jhead
= i
;
816 c
->jheads
[i
].grouped
= 1;
817 c
->jheads
[i
].log_hash
= ubifs_hash_get_desc(c
);
818 if (IS_ERR(c
->jheads
[i
].log_hash
))
823 * Garbage Collector head does not need to be synchronized by timer.
824 * Also GC head nodes are not grouped.
826 c
->jheads
[GCHD
].wbuf
.no_timer
= 1;
827 c
->jheads
[GCHD
].grouped
= 0;
833 kfree(c
->jheads
[i
].log_hash
);
839 * free_wbufs - free write-buffers.
840 * @c: UBIFS file-system description object
842 static void free_wbufs(struct ubifs_info
*c
)
847 for (i
= 0; i
< c
->jhead_cnt
; i
++) {
848 kfree(c
->jheads
[i
].wbuf
.buf
);
849 kfree(c
->jheads
[i
].wbuf
.inodes
);
850 kfree(c
->jheads
[i
].log_hash
);
858 * free_orphans - free orphans.
859 * @c: UBIFS file-system description object
861 static void free_orphans(struct ubifs_info
*c
)
863 struct ubifs_orphan
*orph
;
865 while (c
->orph_dnext
) {
866 orph
= c
->orph_dnext
;
867 c
->orph_dnext
= orph
->dnext
;
868 list_del(&orph
->list
);
872 while (!list_empty(&c
->orph_list
)) {
873 orph
= list_entry(c
->orph_list
.next
, struct ubifs_orphan
, list
);
874 list_del(&orph
->list
);
876 ubifs_err(c
, "orphan list not empty at unmount");
884 * free_buds - free per-bud objects.
885 * @c: UBIFS file-system description object
887 static void free_buds(struct ubifs_info
*c
)
889 struct ubifs_bud
*bud
, *n
;
891 rbtree_postorder_for_each_entry_safe(bud
, n
, &c
->buds
, rb
)
896 * check_volume_empty - check if the UBI volume is empty.
897 * @c: UBIFS file-system description object
899 * This function checks if the UBIFS volume is empty by looking if its LEBs are
900 * mapped or not. The result of checking is stored in the @c->empty variable.
901 * Returns zero in case of success and a negative error code in case of
904 static int check_volume_empty(struct ubifs_info
*c
)
909 for (lnum
= 0; lnum
< c
->leb_cnt
; lnum
++) {
910 err
= ubifs_is_mapped(c
, lnum
);
911 if (unlikely(err
< 0))
925 * UBIFS mount options.
927 * Opt_fast_unmount: do not run a journal commit before un-mounting
928 * Opt_norm_unmount: run a journal commit before un-mounting
929 * Opt_bulk_read: enable bulk-reads
930 * Opt_no_bulk_read: disable bulk-reads
931 * Opt_chk_data_crc: check CRCs when reading data nodes
932 * Opt_no_chk_data_crc: do not check CRCs when reading data nodes
933 * Opt_override_compr: override default compressor
934 * Opt_assert: set ubifs_assert() action
935 * Opt_auth_key: The key name used for authentication
936 * Opt_auth_hash_name: The hash type used for authentication
937 * Opt_err: just end of array marker
954 static const match_table_t tokens
= {
955 {Opt_fast_unmount
, "fast_unmount"},
956 {Opt_norm_unmount
, "norm_unmount"},
957 {Opt_bulk_read
, "bulk_read"},
958 {Opt_no_bulk_read
, "no_bulk_read"},
959 {Opt_chk_data_crc
, "chk_data_crc"},
960 {Opt_no_chk_data_crc
, "no_chk_data_crc"},
961 {Opt_override_compr
, "compr=%s"},
962 {Opt_auth_key
, "auth_key=%s"},
963 {Opt_auth_hash_name
, "auth_hash_name=%s"},
964 {Opt_ignore
, "ubi=%s"},
965 {Opt_ignore
, "vol=%s"},
966 {Opt_assert
, "assert=%s"},
971 * parse_standard_option - parse a standard mount option.
972 * @option: the option to parse
974 * Normally, standard mount options like "sync" are passed to file-systems as
975 * flags. However, when a "rootflags=" kernel boot parameter is used, they may
976 * be present in the options string. This function tries to deal with this
977 * situation and parse standard options. Returns 0 if the option was not
978 * recognized, and the corresponding integer flag if it was.
980 * UBIFS is only interested in the "sync" option, so do not check for anything
983 static int parse_standard_option(const char *option
)
986 pr_notice("UBIFS: parse %s\n", option
);
987 if (!strcmp(option
, "sync"))
988 return SB_SYNCHRONOUS
;
993 * ubifs_parse_options - parse mount parameters.
994 * @c: UBIFS file-system description object
995 * @options: parameters to parse
996 * @is_remount: non-zero if this is FS re-mount
998 * This function parses UBIFS mount options and returns zero in case success
999 * and a negative error code in case of failure.
1001 static int ubifs_parse_options(struct ubifs_info
*c
, char *options
,
1005 substring_t args
[MAX_OPT_ARGS
];
1010 while ((p
= strsep(&options
, ","))) {
1016 token
= match_token(p
, tokens
, args
);
1019 * %Opt_fast_unmount and %Opt_norm_unmount options are ignored.
1020 * We accept them in order to be backward-compatible. But this
1021 * should be removed at some point.
1023 case Opt_fast_unmount
:
1024 c
->mount_opts
.unmount_mode
= 2;
1026 case Opt_norm_unmount
:
1027 c
->mount_opts
.unmount_mode
= 1;
1030 c
->mount_opts
.bulk_read
= 2;
1033 case Opt_no_bulk_read
:
1034 c
->mount_opts
.bulk_read
= 1;
1037 case Opt_chk_data_crc
:
1038 c
->mount_opts
.chk_data_crc
= 2;
1039 c
->no_chk_data_crc
= 0;
1041 case Opt_no_chk_data_crc
:
1042 c
->mount_opts
.chk_data_crc
= 1;
1043 c
->no_chk_data_crc
= 1;
1045 case Opt_override_compr
:
1047 char *name
= match_strdup(&args
[0]);
1051 if (!strcmp(name
, "none"))
1052 c
->mount_opts
.compr_type
= UBIFS_COMPR_NONE
;
1053 else if (!strcmp(name
, "lzo"))
1054 c
->mount_opts
.compr_type
= UBIFS_COMPR_LZO
;
1055 else if (!strcmp(name
, "zlib"))
1056 c
->mount_opts
.compr_type
= UBIFS_COMPR_ZLIB
;
1058 ubifs_err(c
, "unknown compressor \"%s\"", name
); //FIXME: is c ready?
1063 c
->mount_opts
.override_compr
= 1;
1064 c
->default_compr
= c
->mount_opts
.compr_type
;
1069 char *act
= match_strdup(&args
[0]);
1073 if (!strcmp(act
, "report"))
1074 c
->assert_action
= ASSACT_REPORT
;
1075 else if (!strcmp(act
, "read-only"))
1076 c
->assert_action
= ASSACT_RO
;
1077 else if (!strcmp(act
, "panic"))
1078 c
->assert_action
= ASSACT_PANIC
;
1080 ubifs_err(c
, "unknown assert action \"%s\"", act
);
1088 c
->auth_key_name
= kstrdup(args
[0].from
, GFP_KERNEL
);
1089 if (!c
->auth_key_name
)
1092 case Opt_auth_hash_name
:
1093 c
->auth_hash_name
= kstrdup(args
[0].from
, GFP_KERNEL
);
1094 if (!c
->auth_hash_name
)
1102 struct super_block
*sb
= c
->vfs_sb
;
1104 flag
= parse_standard_option(p
);
1106 ubifs_err(c
, "unrecognized mount option \"%s\" or missing value",
1110 sb
->s_flags
|= flag
;
1120 * destroy_journal - destroy journal data structures.
1121 * @c: UBIFS file-system description object
1123 * This function destroys journal data structures including those that may have
1124 * been created by recovery functions.
1126 static void destroy_journal(struct ubifs_info
*c
)
1128 while (!list_empty(&c
->unclean_leb_list
)) {
1129 struct ubifs_unclean_leb
*ucleb
;
1131 ucleb
= list_entry(c
->unclean_leb_list
.next
,
1132 struct ubifs_unclean_leb
, list
);
1133 list_del(&ucleb
->list
);
1136 while (!list_empty(&c
->old_buds
)) {
1137 struct ubifs_bud
*bud
;
1139 bud
= list_entry(c
->old_buds
.next
, struct ubifs_bud
, list
);
1140 list_del(&bud
->list
);
1143 ubifs_destroy_idx_gc(c
);
1144 ubifs_destroy_size_tree(c
);
1150 * bu_init - initialize bulk-read information.
1151 * @c: UBIFS file-system description object
1153 static void bu_init(struct ubifs_info
*c
)
1155 ubifs_assert(c
, c
->bulk_read
== 1);
1158 return; /* Already initialized */
1161 c
->bu
.buf
= kmalloc(c
->max_bu_buf_len
, GFP_KERNEL
| __GFP_NOWARN
);
1163 if (c
->max_bu_buf_len
> UBIFS_KMALLOC_OK
) {
1164 c
->max_bu_buf_len
= UBIFS_KMALLOC_OK
;
1168 /* Just disable bulk-read */
1169 ubifs_warn(c
, "cannot allocate %d bytes of memory for bulk-read, disabling it",
1171 c
->mount_opts
.bulk_read
= 1;
1178 * check_free_space - check if there is enough free space to mount.
1179 * @c: UBIFS file-system description object
1181 * This function makes sure UBIFS has enough free space to be mounted in
1182 * read/write mode. UBIFS must always have some free space to allow deletions.
1184 static int check_free_space(struct ubifs_info
*c
)
1186 ubifs_assert(c
, c
->dark_wm
> 0);
1187 if (c
->lst
.total_free
+ c
->lst
.total_dirty
< c
->dark_wm
) {
1188 ubifs_err(c
, "insufficient free space to mount in R/W mode");
1189 ubifs_dump_budg(c
, &c
->bi
);
1190 ubifs_dump_lprops(c
);
1197 * mount_ubifs - mount UBIFS file-system.
1198 * @c: UBIFS file-system description object
1200 * This function mounts UBIFS file system. Returns zero in case of success and
1201 * a negative error code in case of failure.
1203 static int mount_ubifs(struct ubifs_info
*c
)
1209 c
->ro_mount
= !!sb_rdonly(c
->vfs_sb
);
1210 /* Suppress error messages while probing if SB_SILENT is set */
1211 c
->probing
= !!(c
->vfs_sb
->s_flags
& SB_SILENT
);
1213 err
= init_constants_early(c
);
1217 err
= ubifs_debugging_init(c
);
1221 err
= check_volume_empty(c
);
1225 if (c
->empty
&& (c
->ro_mount
|| c
->ro_media
)) {
1227 * This UBI volume is empty, and read-only, or the file system
1228 * is mounted read-only - we cannot format it.
1230 ubifs_err(c
, "can't format empty UBI volume: read-only %s",
1231 c
->ro_media
? "UBI volume" : "mount");
1236 if (c
->ro_media
&& !c
->ro_mount
) {
1237 ubifs_err(c
, "cannot mount read-write - read-only media");
1243 * The requirement for the buffer is that it should fit indexing B-tree
1244 * height amount of integers. We assume the height if the TNC tree will
1248 c
->bottom_up_buf
= kmalloc_array(BOTTOM_UP_HEIGHT
, sizeof(int),
1250 if (!c
->bottom_up_buf
)
1253 c
->sbuf
= vmalloc(c
->leb_size
);
1258 c
->ileb_buf
= vmalloc(c
->leb_size
);
1263 if (c
->bulk_read
== 1)
1267 c
->write_reserve_buf
= kmalloc(COMPRESSED_DATA_NODE_BUF_SZ
+ \
1268 UBIFS_CIPHER_BLOCK_SIZE
,
1270 if (!c
->write_reserve_buf
)
1276 if (c
->auth_key_name
) {
1277 if (IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION
)) {
1278 err
= ubifs_init_authentication(c
);
1282 ubifs_err(c
, "auth_key_name, but UBIFS is built without"
1283 " authentication support");
1289 err
= ubifs_read_superblock(c
);
1296 * Make sure the compressor which is set as default in the superblock
1297 * or overridden by mount options is actually compiled in.
1299 if (!ubifs_compr_present(c
, c
->default_compr
)) {
1300 ubifs_err(c
, "'compressor \"%s\" is not compiled in",
1301 ubifs_compr_name(c
, c
->default_compr
));
1306 err
= init_constants_sb(c
);
1310 sz
= ALIGN(c
->max_idx_node_sz
, c
->min_io_size
);
1311 sz
= ALIGN(sz
+ c
->max_idx_node_sz
, c
->min_io_size
);
1312 c
->cbuf
= kmalloc(sz
, GFP_NOFS
);
1318 err
= alloc_wbufs(c
);
1322 sprintf(c
->bgt_name
, BGT_NAME_PATTERN
, c
->vi
.ubi_num
, c
->vi
.vol_id
);
1324 /* Create background thread */
1325 c
->bgt
= kthread_create(ubifs_bg_thread
, c
, "%s", c
->bgt_name
);
1326 if (IS_ERR(c
->bgt
)) {
1327 err
= PTR_ERR(c
->bgt
);
1329 ubifs_err(c
, "cannot spawn \"%s\", error %d",
1333 wake_up_process(c
->bgt
);
1336 err
= ubifs_read_master(c
);
1340 init_constants_master(c
);
1342 if ((c
->mst_node
->flags
& cpu_to_le32(UBIFS_MST_DIRTY
)) != 0) {
1343 ubifs_msg(c
, "recovery needed");
1344 c
->need_recovery
= 1;
1347 if (c
->need_recovery
&& !c
->ro_mount
) {
1348 err
= ubifs_recover_inl_heads(c
, c
->sbuf
);
1353 err
= ubifs_lpt_init(c
, 1, !c
->ro_mount
);
1357 if (!c
->ro_mount
&& c
->space_fixup
) {
1358 err
= ubifs_fixup_free_space(c
);
1363 if (!c
->ro_mount
&& !c
->need_recovery
) {
1365 * Set the "dirty" flag so that if we reboot uncleanly we
1366 * will notice this immediately on the next mount.
1368 c
->mst_node
->flags
|= cpu_to_le32(UBIFS_MST_DIRTY
);
1369 err
= ubifs_write_master(c
);
1374 err
= dbg_check_idx_size(c
, c
->bi
.old_idx_sz
);
1378 err
= ubifs_replay_journal(c
);
1382 /* Calculate 'min_idx_lebs' after journal replay */
1383 c
->bi
.min_idx_lebs
= ubifs_calc_min_idx_lebs(c
);
1385 err
= ubifs_mount_orphans(c
, c
->need_recovery
, c
->ro_mount
);
1392 err
= check_free_space(c
);
1396 /* Check for enough log space */
1397 lnum
= c
->lhead_lnum
+ 1;
1398 if (lnum
>= UBIFS_LOG_LNUM
+ c
->log_lebs
)
1399 lnum
= UBIFS_LOG_LNUM
;
1400 if (lnum
== c
->ltail_lnum
) {
1401 err
= ubifs_consolidate_log(c
);
1406 if (c
->need_recovery
) {
1407 if (!ubifs_authenticated(c
)) {
1408 err
= ubifs_recover_size(c
, true);
1413 err
= ubifs_rcvry_gc_commit(c
);
1417 if (ubifs_authenticated(c
)) {
1418 err
= ubifs_recover_size(c
, false);
1423 err
= take_gc_lnum(c
);
1428 * GC LEB may contain garbage if there was an unclean
1429 * reboot, and it should be un-mapped.
1431 err
= ubifs_leb_unmap(c
, c
->gc_lnum
);
1436 err
= dbg_check_lprops(c
);
1439 } else if (c
->need_recovery
) {
1440 err
= ubifs_recover_size(c
, false);
1445 * Even if we mount read-only, we have to set space in GC LEB
1446 * to proper value because this affects UBIFS free space
1447 * reporting. We do not want to have a situation when
1448 * re-mounting from R/O to R/W changes amount of free space.
1450 err
= take_gc_lnum(c
);
1455 spin_lock(&ubifs_infos_lock
);
1456 list_add_tail(&c
->infos_list
, &ubifs_infos
);
1457 spin_unlock(&ubifs_infos_lock
);
1459 if (c
->need_recovery
) {
1461 ubifs_msg(c
, "recovery deferred");
1463 c
->need_recovery
= 0;
1464 ubifs_msg(c
, "recovery completed");
1466 * GC LEB has to be empty and taken at this point. But
1467 * the journal head LEBs may also be accounted as
1468 * "empty taken" if they are empty.
1470 ubifs_assert(c
, c
->lst
.taken_empty_lebs
> 0);
1473 ubifs_assert(c
, c
->lst
.taken_empty_lebs
> 0);
1475 err
= dbg_check_filesystem(c
);
1479 err
= dbg_debugfs_init_fs(c
);
1485 ubifs_msg(c
, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s",
1486 c
->vi
.ubi_num
, c
->vi
.vol_id
, c
->vi
.name
,
1487 c
->ro_mount
? ", R/O mode" : "");
1488 x
= (long long)c
->main_lebs
* c
->leb_size
;
1489 y
= (long long)c
->log_lebs
* c
->leb_size
+ c
->max_bud_bytes
;
1490 ubifs_msg(c
, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
1491 c
->leb_size
, c
->leb_size
>> 10, c
->min_io_size
,
1493 ubifs_msg(c
, "FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)",
1494 x
, x
>> 20, c
->main_lebs
,
1495 y
, y
>> 20, c
->log_lebs
+ c
->max_bud_cnt
);
1496 ubifs_msg(c
, "reserved for root: %llu bytes (%llu KiB)",
1497 c
->report_rp_size
, c
->report_rp_size
>> 10);
1498 ubifs_msg(c
, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
1499 c
->fmt_version
, c
->ro_compat_version
,
1500 UBIFS_FORMAT_VERSION
, UBIFS_RO_COMPAT_VERSION
, c
->uuid
,
1501 c
->big_lpt
? ", big LPT model" : ", small LPT model");
1503 dbg_gen("default compressor: %s", ubifs_compr_name(c
, c
->default_compr
));
1504 dbg_gen("data journal heads: %d",
1505 c
->jhead_cnt
- NONDATA_JHEADS_CNT
);
1506 dbg_gen("log LEBs: %d (%d - %d)",
1507 c
->log_lebs
, UBIFS_LOG_LNUM
, c
->log_last
);
1508 dbg_gen("LPT area LEBs: %d (%d - %d)",
1509 c
->lpt_lebs
, c
->lpt_first
, c
->lpt_last
);
1510 dbg_gen("orphan area LEBs: %d (%d - %d)",
1511 c
->orph_lebs
, c
->orph_first
, c
->orph_last
);
1512 dbg_gen("main area LEBs: %d (%d - %d)",
1513 c
->main_lebs
, c
->main_first
, c
->leb_cnt
- 1);
1514 dbg_gen("index LEBs: %d", c
->lst
.idx_lebs
);
1515 dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)",
1516 c
->bi
.old_idx_sz
, c
->bi
.old_idx_sz
>> 10,
1517 c
->bi
.old_idx_sz
>> 20);
1518 dbg_gen("key hash type: %d", c
->key_hash_type
);
1519 dbg_gen("tree fanout: %d", c
->fanout
);
1520 dbg_gen("reserved GC LEB: %d", c
->gc_lnum
);
1521 dbg_gen("max. znode size %d", c
->max_znode_sz
);
1522 dbg_gen("max. index node size %d", c
->max_idx_node_sz
);
1523 dbg_gen("node sizes: data %zu, inode %zu, dentry %zu",
1524 UBIFS_DATA_NODE_SZ
, UBIFS_INO_NODE_SZ
, UBIFS_DENT_NODE_SZ
);
1525 dbg_gen("node sizes: trun %zu, sb %zu, master %zu",
1526 UBIFS_TRUN_NODE_SZ
, UBIFS_SB_NODE_SZ
, UBIFS_MST_NODE_SZ
);
1527 dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu",
1528 UBIFS_REF_NODE_SZ
, UBIFS_CS_NODE_SZ
, UBIFS_ORPH_NODE_SZ
);
1529 dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
1530 UBIFS_MAX_DATA_NODE_SZ
, UBIFS_MAX_INO_NODE_SZ
,
1531 UBIFS_MAX_DENT_NODE_SZ
, ubifs_idx_node_sz(c
, c
->fanout
));
1532 dbg_gen("dead watermark: %d", c
->dead_wm
);
1533 dbg_gen("dark watermark: %d", c
->dark_wm
);
1534 dbg_gen("LEB overhead: %d", c
->leb_overhead
);
1535 x
= (long long)c
->main_lebs
* c
->dark_wm
;
1536 dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)",
1537 x
, x
>> 10, x
>> 20);
1538 dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
1539 c
->max_bud_bytes
, c
->max_bud_bytes
>> 10,
1540 c
->max_bud_bytes
>> 20);
1541 dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
1542 c
->bg_bud_bytes
, c
->bg_bud_bytes
>> 10,
1543 c
->bg_bud_bytes
>> 20);
1544 dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)",
1545 c
->bud_bytes
, c
->bud_bytes
>> 10, c
->bud_bytes
>> 20);
1546 dbg_gen("max. seq. number: %llu", c
->max_sqnum
);
1547 dbg_gen("commit number: %llu", c
->cmt_no
);
1552 spin_lock(&ubifs_infos_lock
);
1553 list_del(&c
->infos_list
);
1554 spin_unlock(&ubifs_infos_lock
);
1560 ubifs_lpt_free(c
, 0);
1563 kfree(c
->rcvrd_mst_node
);
1565 kthread_stop(c
->bgt
);
1571 kfree(c
->write_reserve_buf
);
1575 kfree(c
->bottom_up_buf
);
1576 ubifs_debugging_exit(c
);
1581 * ubifs_umount - un-mount UBIFS file-system.
1582 * @c: UBIFS file-system description object
1584 * Note, this function is called to free allocated resourced when un-mounting,
1585 * as well as free resources when an error occurred while we were half way
1586 * through mounting (error path cleanup function). So it has to make sure the
1587 * resource was actually allocated before freeing it.
1589 static void ubifs_umount(struct ubifs_info
*c
)
1591 dbg_gen("un-mounting UBI device %d, volume %d", c
->vi
.ubi_num
,
1594 dbg_debugfs_exit_fs(c
);
1595 spin_lock(&ubifs_infos_lock
);
1596 list_del(&c
->infos_list
);
1597 spin_unlock(&ubifs_infos_lock
);
1600 kthread_stop(c
->bgt
);
1605 ubifs_lpt_free(c
, 0);
1606 ubifs_exit_authentication(c
);
1608 kfree(c
->auth_key_name
);
1609 kfree(c
->auth_hash_name
);
1611 kfree(c
->rcvrd_mst_node
);
1613 kfree(c
->write_reserve_buf
);
1617 kfree(c
->bottom_up_buf
);
1618 ubifs_debugging_exit(c
);
1622 * ubifs_remount_rw - re-mount in read-write mode.
1623 * @c: UBIFS file-system description object
1625 * UBIFS avoids allocating many unnecessary resources when mounted in read-only
1626 * mode. This function allocates the needed resources and re-mounts UBIFS in
1629 static int ubifs_remount_rw(struct ubifs_info
*c
)
1633 if (c
->rw_incompat
) {
1634 ubifs_err(c
, "the file-system is not R/W-compatible");
1635 ubifs_msg(c
, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
1636 c
->fmt_version
, c
->ro_compat_version
,
1637 UBIFS_FORMAT_VERSION
, UBIFS_RO_COMPAT_VERSION
);
1641 mutex_lock(&c
->umount_mutex
);
1642 dbg_save_space_info(c
);
1643 c
->remounting_rw
= 1;
1646 if (c
->space_fixup
) {
1647 err
= ubifs_fixup_free_space(c
);
1652 err
= check_free_space(c
);
1656 if (c
->old_leb_cnt
!= c
->leb_cnt
) {
1657 struct ubifs_sb_node
*sup
= c
->sup_node
;
1659 sup
->leb_cnt
= cpu_to_le32(c
->leb_cnt
);
1660 err
= ubifs_write_sb_node(c
, sup
);
1665 if (c
->need_recovery
) {
1666 ubifs_msg(c
, "completing deferred recovery");
1667 err
= ubifs_write_rcvrd_mst_node(c
);
1670 if (!ubifs_authenticated(c
)) {
1671 err
= ubifs_recover_size(c
, true);
1675 err
= ubifs_clean_lebs(c
, c
->sbuf
);
1678 err
= ubifs_recover_inl_heads(c
, c
->sbuf
);
1682 /* A readonly mount is not allowed to have orphans */
1683 ubifs_assert(c
, c
->tot_orphans
== 0);
1684 err
= ubifs_clear_orphans(c
);
1689 if (!(c
->mst_node
->flags
& cpu_to_le32(UBIFS_MST_DIRTY
))) {
1690 c
->mst_node
->flags
|= cpu_to_le32(UBIFS_MST_DIRTY
);
1691 err
= ubifs_write_master(c
);
1696 c
->ileb_buf
= vmalloc(c
->leb_size
);
1702 c
->write_reserve_buf
= kmalloc(COMPRESSED_DATA_NODE_BUF_SZ
+ \
1703 UBIFS_CIPHER_BLOCK_SIZE
, GFP_KERNEL
);
1704 if (!c
->write_reserve_buf
) {
1709 err
= ubifs_lpt_init(c
, 0, 1);
1713 /* Create background thread */
1714 c
->bgt
= kthread_create(ubifs_bg_thread
, c
, "%s", c
->bgt_name
);
1715 if (IS_ERR(c
->bgt
)) {
1716 err
= PTR_ERR(c
->bgt
);
1718 ubifs_err(c
, "cannot spawn \"%s\", error %d",
1722 wake_up_process(c
->bgt
);
1724 c
->orph_buf
= vmalloc(c
->leb_size
);
1730 /* Check for enough log space */
1731 lnum
= c
->lhead_lnum
+ 1;
1732 if (lnum
>= UBIFS_LOG_LNUM
+ c
->log_lebs
)
1733 lnum
= UBIFS_LOG_LNUM
;
1734 if (lnum
== c
->ltail_lnum
) {
1735 err
= ubifs_consolidate_log(c
);
1740 if (c
->need_recovery
) {
1741 err
= ubifs_rcvry_gc_commit(c
);
1745 if (ubifs_authenticated(c
)) {
1746 err
= ubifs_recover_size(c
, false);
1751 err
= ubifs_leb_unmap(c
, c
->gc_lnum
);
1756 dbg_gen("re-mounted read-write");
1757 c
->remounting_rw
= 0;
1759 if (c
->need_recovery
) {
1760 c
->need_recovery
= 0;
1761 ubifs_msg(c
, "deferred recovery completed");
1764 * Do not run the debugging space check if the were doing
1765 * recovery, because when we saved the information we had the
1766 * file-system in a state where the TNC and lprops has been
1767 * modified in memory, but all the I/O operations (including a
1768 * commit) were deferred. So the file-system was in
1769 * "non-committed" state. Now the file-system is in committed
1770 * state, and of course the amount of free space will change
1771 * because, for example, the old index size was imprecise.
1773 err
= dbg_check_space_info(c
);
1776 mutex_unlock(&c
->umount_mutex
);
1784 kthread_stop(c
->bgt
);
1788 kfree(c
->write_reserve_buf
);
1789 c
->write_reserve_buf
= NULL
;
1792 ubifs_lpt_free(c
, 1);
1793 c
->remounting_rw
= 0;
1794 mutex_unlock(&c
->umount_mutex
);
1799 * ubifs_remount_ro - re-mount in read-only mode.
1800 * @c: UBIFS file-system description object
1802 * We assume VFS has stopped writing. Possibly the background thread could be
1803 * running a commit, however kthread_stop will wait in that case.
1805 static void ubifs_remount_ro(struct ubifs_info
*c
)
1809 ubifs_assert(c
, !c
->need_recovery
);
1810 ubifs_assert(c
, !c
->ro_mount
);
1812 mutex_lock(&c
->umount_mutex
);
1814 kthread_stop(c
->bgt
);
1818 dbg_save_space_info(c
);
1820 for (i
= 0; i
< c
->jhead_cnt
; i
++) {
1821 err
= ubifs_wbuf_sync(&c
->jheads
[i
].wbuf
);
1823 ubifs_ro_mode(c
, err
);
1826 c
->mst_node
->flags
&= ~cpu_to_le32(UBIFS_MST_DIRTY
);
1827 c
->mst_node
->flags
|= cpu_to_le32(UBIFS_MST_NO_ORPHS
);
1828 c
->mst_node
->gc_lnum
= cpu_to_le32(c
->gc_lnum
);
1829 err
= ubifs_write_master(c
);
1831 ubifs_ro_mode(c
, err
);
1835 kfree(c
->write_reserve_buf
);
1836 c
->write_reserve_buf
= NULL
;
1839 ubifs_lpt_free(c
, 1);
1841 err
= dbg_check_space_info(c
);
1843 ubifs_ro_mode(c
, err
);
1844 mutex_unlock(&c
->umount_mutex
);
1847 static void ubifs_put_super(struct super_block
*sb
)
1850 struct ubifs_info
*c
= sb
->s_fs_info
;
1852 ubifs_msg(c
, "un-mount UBI device %d", c
->vi
.ubi_num
);
1855 * The following asserts are only valid if there has not been a failure
1856 * of the media. For example, there will be dirty inodes if we failed
1857 * to write them back because of I/O errors.
1860 ubifs_assert(c
, c
->bi
.idx_growth
== 0);
1861 ubifs_assert(c
, c
->bi
.dd_growth
== 0);
1862 ubifs_assert(c
, c
->bi
.data_growth
== 0);
1866 * The 'c->umount_lock' prevents races between UBIFS memory shrinker
1867 * and file system un-mount. Namely, it prevents the shrinker from
1868 * picking this superblock for shrinking - it will be just skipped if
1869 * the mutex is locked.
1871 mutex_lock(&c
->umount_mutex
);
1874 * First of all kill the background thread to make sure it does
1875 * not interfere with un-mounting and freeing resources.
1878 kthread_stop(c
->bgt
);
1883 * On fatal errors c->ro_error is set to 1, in which case we do
1884 * not write the master node.
1889 /* Synchronize write-buffers */
1890 for (i
= 0; i
< c
->jhead_cnt
; i
++) {
1891 err
= ubifs_wbuf_sync(&c
->jheads
[i
].wbuf
);
1893 ubifs_ro_mode(c
, err
);
1897 * We are being cleanly unmounted which means the
1898 * orphans were killed - indicate this in the master
1899 * node. Also save the reserved GC LEB number.
1901 c
->mst_node
->flags
&= ~cpu_to_le32(UBIFS_MST_DIRTY
);
1902 c
->mst_node
->flags
|= cpu_to_le32(UBIFS_MST_NO_ORPHS
);
1903 c
->mst_node
->gc_lnum
= cpu_to_le32(c
->gc_lnum
);
1904 err
= ubifs_write_master(c
);
1907 * Recovery will attempt to fix the master area
1908 * next mount, so we just print a message and
1909 * continue to unmount normally.
1911 ubifs_err(c
, "failed to write master node, error %d",
1914 for (i
= 0; i
< c
->jhead_cnt
; i
++)
1915 /* Make sure write-buffer timers are canceled */
1916 hrtimer_cancel(&c
->jheads
[i
].wbuf
.timer
);
1921 ubi_close_volume(c
->ubi
);
1922 mutex_unlock(&c
->umount_mutex
);
1925 static int ubifs_remount_fs(struct super_block
*sb
, int *flags
, char *data
)
1928 struct ubifs_info
*c
= sb
->s_fs_info
;
1930 sync_filesystem(sb
);
1931 dbg_gen("old flags %#lx, new flags %#x", sb
->s_flags
, *flags
);
1933 err
= ubifs_parse_options(c
, data
, 1);
1935 ubifs_err(c
, "invalid or unknown remount parameter");
1939 if (c
->ro_mount
&& !(*flags
& SB_RDONLY
)) {
1941 ubifs_msg(c
, "cannot re-mount R/W due to prior errors");
1945 ubifs_msg(c
, "cannot re-mount R/W - UBI volume is R/O");
1948 err
= ubifs_remount_rw(c
);
1951 } else if (!c
->ro_mount
&& (*flags
& SB_RDONLY
)) {
1953 ubifs_msg(c
, "cannot re-mount R/O due to prior errors");
1956 ubifs_remount_ro(c
);
1959 if (c
->bulk_read
== 1)
1962 dbg_gen("disable bulk-read");
1963 mutex_lock(&c
->bu_mutex
);
1966 mutex_unlock(&c
->bu_mutex
);
1969 if (!c
->need_recovery
)
1970 ubifs_assert(c
, c
->lst
.taken_empty_lebs
> 0);
1975 const struct super_operations ubifs_super_operations
= {
1976 .alloc_inode
= ubifs_alloc_inode
,
1977 .free_inode
= ubifs_free_inode
,
1978 .put_super
= ubifs_put_super
,
1979 .write_inode
= ubifs_write_inode
,
1980 .evict_inode
= ubifs_evict_inode
,
1981 .statfs
= ubifs_statfs
,
1982 .dirty_inode
= ubifs_dirty_inode
,
1983 .remount_fs
= ubifs_remount_fs
,
1984 .show_options
= ubifs_show_options
,
1985 .sync_fs
= ubifs_sync_fs
,
1989 * open_ubi - parse UBI device name string and open the UBI device.
1990 * @name: UBI volume name
1991 * @mode: UBI volume open mode
1993 * The primary method of mounting UBIFS is by specifying the UBI volume
1994 * character device node path. However, UBIFS may also be mounted withoug any
1995 * character device node using one of the following methods:
1997 * o ubiX_Y - mount UBI device number X, volume Y;
1998 * o ubiY - mount UBI device number 0, volume Y;
1999 * o ubiX:NAME - mount UBI device X, volume with name NAME;
2000 * o ubi:NAME - mount UBI device 0, volume with name NAME.
2002 * Alternative '!' separator may be used instead of ':' (because some shells
2003 * like busybox may interpret ':' as an NFS host name separator). This function
2004 * returns UBI volume description object in case of success and a negative
2005 * error code in case of failure.
2007 static struct ubi_volume_desc
*open_ubi(const char *name
, int mode
)
2009 struct ubi_volume_desc
*ubi
;
2013 if (!name
|| !*name
)
2014 return ERR_PTR(-EINVAL
);
2016 /* First, try to open using the device node path method */
2017 ubi
= ubi_open_volume_path(name
, mode
);
2021 /* Try the "nodev" method */
2022 if (name
[0] != 'u' || name
[1] != 'b' || name
[2] != 'i')
2023 return ERR_PTR(-EINVAL
);
2025 /* ubi:NAME method */
2026 if ((name
[3] == ':' || name
[3] == '!') && name
[4] != '\0')
2027 return ubi_open_volume_nm(0, name
+ 4, mode
);
2029 if (!isdigit(name
[3]))
2030 return ERR_PTR(-EINVAL
);
2032 dev
= simple_strtoul(name
+ 3, &endptr
, 0);
2035 if (*endptr
== '\0')
2036 return ubi_open_volume(0, dev
, mode
);
2039 if (*endptr
== '_' && isdigit(endptr
[1])) {
2040 vol
= simple_strtoul(endptr
+ 1, &endptr
, 0);
2041 if (*endptr
!= '\0')
2042 return ERR_PTR(-EINVAL
);
2043 return ubi_open_volume(dev
, vol
, mode
);
2046 /* ubiX:NAME method */
2047 if ((*endptr
== ':' || *endptr
== '!') && endptr
[1] != '\0')
2048 return ubi_open_volume_nm(dev
, ++endptr
, mode
);
2050 return ERR_PTR(-EINVAL
);
2053 static struct ubifs_info
*alloc_ubifs_info(struct ubi_volume_desc
*ubi
)
2055 struct ubifs_info
*c
;
2057 c
= kzalloc(sizeof(struct ubifs_info
), GFP_KERNEL
);
2059 spin_lock_init(&c
->cnt_lock
);
2060 spin_lock_init(&c
->cs_lock
);
2061 spin_lock_init(&c
->buds_lock
);
2062 spin_lock_init(&c
->space_lock
);
2063 spin_lock_init(&c
->orphan_lock
);
2064 init_rwsem(&c
->commit_sem
);
2065 mutex_init(&c
->lp_mutex
);
2066 mutex_init(&c
->tnc_mutex
);
2067 mutex_init(&c
->log_mutex
);
2068 mutex_init(&c
->umount_mutex
);
2069 mutex_init(&c
->bu_mutex
);
2070 mutex_init(&c
->write_reserve_mutex
);
2071 init_waitqueue_head(&c
->cmt_wq
);
2073 c
->old_idx
= RB_ROOT
;
2074 c
->size_tree
= RB_ROOT
;
2075 c
->orph_tree
= RB_ROOT
;
2076 INIT_LIST_HEAD(&c
->infos_list
);
2077 INIT_LIST_HEAD(&c
->idx_gc
);
2078 INIT_LIST_HEAD(&c
->replay_list
);
2079 INIT_LIST_HEAD(&c
->replay_buds
);
2080 INIT_LIST_HEAD(&c
->uncat_list
);
2081 INIT_LIST_HEAD(&c
->empty_list
);
2082 INIT_LIST_HEAD(&c
->freeable_list
);
2083 INIT_LIST_HEAD(&c
->frdi_idx_list
);
2084 INIT_LIST_HEAD(&c
->unclean_leb_list
);
2085 INIT_LIST_HEAD(&c
->old_buds
);
2086 INIT_LIST_HEAD(&c
->orph_list
);
2087 INIT_LIST_HEAD(&c
->orph_new
);
2088 c
->no_chk_data_crc
= 1;
2089 c
->assert_action
= ASSACT_RO
;
2091 c
->highest_inum
= UBIFS_FIRST_INO
;
2092 c
->lhead_lnum
= c
->ltail_lnum
= UBIFS_LOG_LNUM
;
2094 ubi_get_volume_info(ubi
, &c
->vi
);
2095 ubi_get_device_info(c
->vi
.ubi_num
, &c
->di
);
2100 static int ubifs_fill_super(struct super_block
*sb
, void *data
, int silent
)
2102 struct ubifs_info
*c
= sb
->s_fs_info
;
2107 /* Re-open the UBI device in read-write mode */
2108 c
->ubi
= ubi_open_volume(c
->vi
.ubi_num
, c
->vi
.vol_id
, UBI_READWRITE
);
2109 if (IS_ERR(c
->ubi
)) {
2110 err
= PTR_ERR(c
->ubi
);
2114 err
= ubifs_parse_options(c
, data
, 0);
2119 * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For
2120 * UBIFS, I/O is not deferred, it is done immediately in readpage,
2121 * which means the user would have to wait not just for their own I/O
2122 * but the read-ahead I/O as well i.e. completely pointless.
2124 * Read-ahead will be disabled because @sb->s_bdi->ra_pages is 0. Also
2125 * @sb->s_bdi->capabilities are initialized to 0 so there won't be any
2126 * writeback happening.
2128 err
= super_setup_bdi_name(sb
, "ubifs_%d_%d", c
->vi
.ubi_num
,
2134 sb
->s_magic
= UBIFS_SUPER_MAGIC
;
2135 sb
->s_blocksize
= UBIFS_BLOCK_SIZE
;
2136 sb
->s_blocksize_bits
= UBIFS_BLOCK_SHIFT
;
2137 sb
->s_maxbytes
= c
->max_inode_sz
= key_max_inode_size(c
);
2138 if (c
->max_inode_sz
> MAX_LFS_FILESIZE
)
2139 sb
->s_maxbytes
= c
->max_inode_sz
= MAX_LFS_FILESIZE
;
2140 sb
->s_op
= &ubifs_super_operations
;
2141 #ifdef CONFIG_UBIFS_FS_XATTR
2142 sb
->s_xattr
= ubifs_xattr_handlers
;
2144 #ifdef CONFIG_FS_ENCRYPTION
2145 sb
->s_cop
= &ubifs_crypt_operations
;
2148 mutex_lock(&c
->umount_mutex
);
2149 err
= mount_ubifs(c
);
2151 ubifs_assert(c
, err
< 0);
2155 /* Read the root inode */
2156 root
= ubifs_iget(sb
, UBIFS_ROOT_INO
);
2158 err
= PTR_ERR(root
);
2162 sb
->s_root
= d_make_root(root
);
2168 mutex_unlock(&c
->umount_mutex
);
2174 mutex_unlock(&c
->umount_mutex
);
2176 ubi_close_volume(c
->ubi
);
2181 static int sb_test(struct super_block
*sb
, void *data
)
2183 struct ubifs_info
*c1
= data
;
2184 struct ubifs_info
*c
= sb
->s_fs_info
;
2186 return c
->vi
.cdev
== c1
->vi
.cdev
;
2189 static int sb_set(struct super_block
*sb
, void *data
)
2191 sb
->s_fs_info
= data
;
2192 return set_anon_super(sb
, NULL
);
2195 static struct dentry
*ubifs_mount(struct file_system_type
*fs_type
, int flags
,
2196 const char *name
, void *data
)
2198 struct ubi_volume_desc
*ubi
;
2199 struct ubifs_info
*c
;
2200 struct super_block
*sb
;
2203 dbg_gen("name %s, flags %#x", name
, flags
);
2206 * Get UBI device number and volume ID. Mount it read-only so far
2207 * because this might be a new mount point, and UBI allows only one
2208 * read-write user at a time.
2210 ubi
= open_ubi(name
, UBI_READONLY
);
2212 if (!(flags
& SB_SILENT
))
2213 pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d",
2214 current
->pid
, name
, (int)PTR_ERR(ubi
));
2215 return ERR_CAST(ubi
);
2218 c
= alloc_ubifs_info(ubi
);
2224 dbg_gen("opened ubi%d_%d", c
->vi
.ubi_num
, c
->vi
.vol_id
);
2226 sb
= sget(fs_type
, sb_test
, sb_set
, flags
, c
);
2234 struct ubifs_info
*c1
= sb
->s_fs_info
;
2236 /* A new mount point for already mounted UBIFS */
2237 dbg_gen("this ubi volume is already mounted");
2238 if (!!(flags
& SB_RDONLY
) != c1
->ro_mount
) {
2243 err
= ubifs_fill_super(sb
, data
, flags
& SB_SILENT
? 1 : 0);
2246 /* We do not support atime */
2247 sb
->s_flags
|= SB_ACTIVE
;
2248 #ifndef CONFIG_UBIFS_ATIME_SUPPORT
2249 sb
->s_flags
|= SB_NOATIME
;
2251 ubifs_msg(c
, "full atime support is enabled.");
2255 /* 'fill_super()' opens ubi again so we must close it here */
2256 ubi_close_volume(ubi
);
2258 return dget(sb
->s_root
);
2261 deactivate_locked_super(sb
);
2263 ubi_close_volume(ubi
);
2264 return ERR_PTR(err
);
2267 static void kill_ubifs_super(struct super_block
*s
)
2269 struct ubifs_info
*c
= s
->s_fs_info
;
2274 static struct file_system_type ubifs_fs_type
= {
2276 .owner
= THIS_MODULE
,
2277 .mount
= ubifs_mount
,
2278 .kill_sb
= kill_ubifs_super
,
2280 MODULE_ALIAS_FS("ubifs");
2283 * Inode slab cache constructor.
2285 static void inode_slab_ctor(void *obj
)
2287 struct ubifs_inode
*ui
= obj
;
2288 inode_init_once(&ui
->vfs_inode
);
2291 static int __init
ubifs_init(void)
2295 BUILD_BUG_ON(sizeof(struct ubifs_ch
) != 24);
2297 /* Make sure node sizes are 8-byte aligned */
2298 BUILD_BUG_ON(UBIFS_CH_SZ
& 7);
2299 BUILD_BUG_ON(UBIFS_INO_NODE_SZ
& 7);
2300 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ
& 7);
2301 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ
& 7);
2302 BUILD_BUG_ON(UBIFS_DATA_NODE_SZ
& 7);
2303 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ
& 7);
2304 BUILD_BUG_ON(UBIFS_SB_NODE_SZ
& 7);
2305 BUILD_BUG_ON(UBIFS_MST_NODE_SZ
& 7);
2306 BUILD_BUG_ON(UBIFS_REF_NODE_SZ
& 7);
2307 BUILD_BUG_ON(UBIFS_CS_NODE_SZ
& 7);
2308 BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ
& 7);
2310 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ
& 7);
2311 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ
& 7);
2312 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ
& 7);
2313 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ
& 7);
2314 BUILD_BUG_ON(UBIFS_MAX_NODE_SZ
& 7);
2315 BUILD_BUG_ON(MIN_WRITE_SZ
& 7);
2317 /* Check min. node size */
2318 BUILD_BUG_ON(UBIFS_INO_NODE_SZ
< MIN_WRITE_SZ
);
2319 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ
< MIN_WRITE_SZ
);
2320 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ
< MIN_WRITE_SZ
);
2321 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ
< MIN_WRITE_SZ
);
2323 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ
> UBIFS_MAX_NODE_SZ
);
2324 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ
> UBIFS_MAX_NODE_SZ
);
2325 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ
> UBIFS_MAX_NODE_SZ
);
2326 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ
> UBIFS_MAX_NODE_SZ
);
2328 /* Defined node sizes */
2329 BUILD_BUG_ON(UBIFS_SB_NODE_SZ
!= 4096);
2330 BUILD_BUG_ON(UBIFS_MST_NODE_SZ
!= 512);
2331 BUILD_BUG_ON(UBIFS_INO_NODE_SZ
!= 160);
2332 BUILD_BUG_ON(UBIFS_REF_NODE_SZ
!= 64);
2335 * We use 2 bit wide bit-fields to store compression type, which should
2336 * be amended if more compressors are added. The bit-fields are:
2337 * @compr_type in 'struct ubifs_inode', @default_compr in
2338 * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'.
2340 BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT
> 4);
2343 * We require that PAGE_SIZE is greater-than-or-equal-to
2344 * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
2346 if (PAGE_SIZE
< UBIFS_BLOCK_SIZE
) {
2347 pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes",
2348 current
->pid
, (unsigned int)PAGE_SIZE
);
2352 ubifs_inode_slab
= kmem_cache_create("ubifs_inode_slab",
2353 sizeof(struct ubifs_inode
), 0,
2354 SLAB_MEM_SPREAD
| SLAB_RECLAIM_ACCOUNT
|
2355 SLAB_ACCOUNT
, &inode_slab_ctor
);
2356 if (!ubifs_inode_slab
)
2359 err
= register_shrinker(&ubifs_shrinker_info
);
2363 err
= ubifs_compressors_init();
2367 err
= dbg_debugfs_init();
2371 err
= register_filesystem(&ubifs_fs_type
);
2373 pr_err("UBIFS error (pid %d): cannot register file system, error %d",
2382 ubifs_compressors_exit();
2384 unregister_shrinker(&ubifs_shrinker_info
);
2386 kmem_cache_destroy(ubifs_inode_slab
);
2389 /* late_initcall to let compressors initialize first */
2390 late_initcall(ubifs_init
);
2392 static void __exit
ubifs_exit(void)
2394 WARN_ON(!list_empty(&ubifs_infos
));
2395 WARN_ON(atomic_long_read(&ubifs_clean_zn_cnt
) != 0);
2398 ubifs_compressors_exit();
2399 unregister_shrinker(&ubifs_shrinker_info
);
2402 * Make sure all delayed rcu free inodes are flushed before we
2406 kmem_cache_destroy(ubifs_inode_slab
);
2407 unregister_filesystem(&ubifs_fs_type
);
2409 module_exit(ubifs_exit
);
2411 MODULE_LICENSE("GPL");
2412 MODULE_VERSION(__stringify(UBIFS_VERSION
));
2413 MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2414 MODULE_DESCRIPTION("UBIFS - UBI File System");