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Artem Bityutskiy1e517642008-07-14 19:08:37 +03001/*
2 * This file is part of UBIFS.
3 *
4 * Copyright (C) 2006-2008 Nokia Corporation
5 *
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.
9 *
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
13 * more details.
14 *
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
18 *
19 * Authors: Artem Bityutskiy (Битюцкий Артём)
20 * Adrian Hunter
21 */
22
Artem Bityutskiy1e517642008-07-14 19:08:37 +030023#ifndef __UBIFS_H__
24#define __UBIFS_H__
25
26#include <asm/div64.h>
27#include <linux/statfs.h>
28#include <linux/fs.h>
29#include <linux/err.h>
30#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Artem Bityutskiy1e517642008-07-14 19:08:37 +030032#include <linux/vmalloc.h>
33#include <linux/spinlock.h>
34#include <linux/mutex.h>
35#include <linux/rwsem.h>
36#include <linux/mtd/ubi.h>
37#include <linux/pagemap.h>
38#include <linux/backing-dev.h>
Subodh Nijsured7f0b702014-10-31 13:50:30 -050039#include <linux/security.h>
Artem Bityutskiy1e517642008-07-14 19:08:37 +030040#include "ubifs-media.h"
41
42/* Version of this UBIFS implementation */
43#define UBIFS_VERSION 1
44
45/* Normal UBIFS messages */
Sheng Yong235c3622015-03-20 10:39:42 +000046#define ubifs_msg(c, fmt, ...) \
47 pr_notice("UBIFS (ubi%d:%d): " fmt "\n", \
48 (c)->vi.ubi_num, (c)->vi.vol_id, ##__VA_ARGS__)
Artem Bityutskiy1e517642008-07-14 19:08:37 +030049/* UBIFS error messages */
Sheng Yong235c3622015-03-20 10:39:42 +000050#define ubifs_err(c, fmt, ...) \
51 pr_err("UBIFS error (ubi%d:%d pid %d): %s: " fmt "\n", \
52 (c)->vi.ubi_num, (c)->vi.vol_id, current->pid, \
Artem Bityutskiy1e517642008-07-14 19:08:37 +030053 __func__, ##__VA_ARGS__)
54/* UBIFS warning messages */
Sheng Yong235c3622015-03-20 10:39:42 +000055#define ubifs_warn(c, fmt, ...) \
56 pr_warn("UBIFS warning (ubi%d:%d pid %d): %s: " fmt "\n", \
57 (c)->vi.ubi_num, (c)->vi.vol_id, current->pid, \
58 __func__, ##__VA_ARGS__)
Daniel Golle90bea5a32014-06-02 15:51:10 +020059/*
60 * A variant of 'ubifs_err()' which takes the UBIFS file-sytem description
61 * object as an argument.
62 */
63#define ubifs_errc(c, fmt, ...) \
64 do { \
65 if (!(c)->probing) \
Sheng Yong235c3622015-03-20 10:39:42 +000066 ubifs_err(c, fmt, ##__VA_ARGS__); \
Daniel Golle90bea5a32014-06-02 15:51:10 +020067 } while (0)
Artem Bityutskiy1e517642008-07-14 19:08:37 +030068
69/* UBIFS file system VFS magic number */
70#define UBIFS_SUPER_MAGIC 0x24051905
71
72/* Number of UBIFS blocks per VFS page */
73#define UBIFS_BLOCKS_PER_PAGE (PAGE_CACHE_SIZE / UBIFS_BLOCK_SIZE)
74#define UBIFS_BLOCKS_PER_PAGE_SHIFT (PAGE_CACHE_SHIFT - UBIFS_BLOCK_SHIFT)
75
76/* "File system end of life" sequence number watermark */
77#define SQNUM_WARN_WATERMARK 0xFFFFFFFF00000000ULL
78#define SQNUM_WATERMARK 0xFFFFFFFFFF000000ULL
79
Artem Bityutskiyaf14a1a2008-12-19 19:26:29 +020080/*
81 * Minimum amount of LEBs reserved for the index. At present the index needs at
82 * least 2 LEBs: one for the index head and one for in-the-gaps method (which
83 * currently does not cater for the index head and so excludes it from
84 * consideration).
85 */
86#define MIN_INDEX_LEBS 2
87
Artem Bityutskiy1e517642008-07-14 19:08:37 +030088/* Minimum amount of data UBIFS writes to the flash */
89#define MIN_WRITE_SZ (UBIFS_DATA_NODE_SZ + 8)
90
91/*
92 * Currently we do not support inode number overlapping and re-using, so this
93 * watermark defines dangerous inode number level. This should be fixed later,
94 * although it is difficult to exceed current limit. Another option is to use
95 * 64-bit inode numbers, but this means more overhead.
96 */
97#define INUM_WARN_WATERMARK 0xFFF00000
98#define INUM_WATERMARK 0xFFFFFF00
99
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300100/* Maximum number of entries in each LPT (LEB category) heap */
101#define LPT_HEAP_SZ 256
102
103/*
104 * Background thread name pattern. The numbers are UBI device and volume
105 * numbers.
106 */
107#define BGT_NAME_PATTERN "ubifs_bgt%d_%d"
108
Artem Bityutskiy2a35a3a82009-06-23 20:26:33 +0300109/* Write-buffer synchronization timeout interval in seconds */
110#define WBUF_TIMEOUT_SOFTLIMIT 3
111#define WBUF_TIMEOUT_HARDLIMIT 5
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300112
113/* Maximum possible inode number (only 32-bit inodes are supported now) */
114#define MAX_INUM 0xFFFFFFFF
115
116/* Number of non-data journal heads */
117#define NONDATA_JHEADS_CNT 2
118
Artem Bityutskiyd6d14002009-09-15 14:44:06 +0300119/* Shorter names for journal head numbers for internal usage */
120#define GCHD UBIFS_GC_HEAD
121#define BASEHD UBIFS_BASE_HEAD
122#define DATAHD UBIFS_DATA_HEAD
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300123
124/* 'No change' value for 'ubifs_change_lp()' */
125#define LPROPS_NC 0x80000001
126
127/*
128 * There is no notion of truncation key because truncation nodes do not exist
129 * in TNC. However, when replaying, it is handy to introduce fake "truncation"
130 * keys for truncation nodes because the code becomes simpler. So we define
131 * %UBIFS_TRUN_KEY type.
Artem Bityutskiyba2f48f2010-08-22 07:10:12 +0300132 *
133 * But otherwise, out of the journal reply scope, the truncation keys are
134 * invalid.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300135 */
Artem Bityutskiyba2f48f2010-08-22 07:10:12 +0300136#define UBIFS_TRUN_KEY UBIFS_KEY_TYPES_CNT
137#define UBIFS_INVALID_KEY UBIFS_KEY_TYPES_CNT
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300138
139/*
140 * How much a directory entry/extended attribute entry adds to the parent/host
141 * inode.
142 */
143#define CALC_DENT_SIZE(name_len) ALIGN(UBIFS_DENT_NODE_SZ + (name_len) + 1, 8)
144
145/* How much an extended attribute adds to the host inode */
146#define CALC_XATTR_BYTES(data_len) ALIGN(UBIFS_INO_NODE_SZ + (data_len) + 1, 8)
147
148/*
149 * Znodes which were not touched for 'OLD_ZNODE_AGE' seconds are considered
150 * "old", and znode which were touched last 'YOUNG_ZNODE_AGE' seconds ago are
151 * considered "young". This is used by shrinker when selecting znode to trim
152 * off.
153 */
154#define OLD_ZNODE_AGE 20
155#define YOUNG_ZNODE_AGE 5
156
157/*
158 * Some compressors, like LZO, may end up with more data then the input buffer.
159 * So UBIFS always allocates larger output buffer, to be sure the compressor
160 * will not corrupt memory in case of worst case compression.
161 */
162#define WORST_COMPR_FACTOR 2
163
Matthew L. Creechd8829622011-03-04 17:55:02 -0500164/*
Yannick Guerrinid3f9db02015-03-06 23:14:39 +0100165 * How much memory is needed for a buffer where we compress a data node.
Matthew L. Creechd8829622011-03-04 17:55:02 -0500166 */
167#define COMPRESSED_DATA_NODE_BUF_SZ \
168 (UBIFS_DATA_NODE_SZ + UBIFS_BLOCK_SIZE * WORST_COMPR_FACTOR)
169
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300170/* Maximum expected tree height for use by bottom_up_buf */
171#define BOTTOM_UP_HEIGHT 64
172
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300173/* Maximum number of data nodes to bulk-read */
174#define UBIFS_MAX_BULK_READ 32
175
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300176/*
177 * Lockdep classes for UBIFS inode @ui_mutex.
178 */
179enum {
180 WB_MUTEX_1 = 0,
181 WB_MUTEX_2 = 1,
182 WB_MUTEX_3 = 2,
183};
184
185/*
186 * Znode flags (actually, bit numbers which store the flags).
187 *
188 * DIRTY_ZNODE: znode is dirty
189 * COW_ZNODE: znode is being committed and a new instance of this znode has to
190 * be created before changing this znode
191 * OBSOLETE_ZNODE: znode is obsolete, which means it was deleted, but it is
192 * still in the commit list and the ongoing commit operation
193 * will commit it, and delete this znode after it is done
194 */
195enum {
196 DIRTY_ZNODE = 0,
197 COW_ZNODE = 1,
198 OBSOLETE_ZNODE = 2,
199};
200
201/*
202 * Commit states.
203 *
204 * COMMIT_RESTING: commit is not wanted
205 * COMMIT_BACKGROUND: background commit has been requested
206 * COMMIT_REQUIRED: commit is required
207 * COMMIT_RUNNING_BACKGROUND: background commit is running
208 * COMMIT_RUNNING_REQUIRED: commit is running and it is required
209 * COMMIT_BROKEN: commit failed
210 */
211enum {
212 COMMIT_RESTING = 0,
213 COMMIT_BACKGROUND,
214 COMMIT_REQUIRED,
215 COMMIT_RUNNING_BACKGROUND,
216 COMMIT_RUNNING_REQUIRED,
217 COMMIT_BROKEN,
218};
219
220/*
221 * 'ubifs_scan_a_node()' return values.
222 *
223 * SCANNED_GARBAGE: scanned garbage
224 * SCANNED_EMPTY_SPACE: scanned empty space
225 * SCANNED_A_NODE: scanned a valid node
226 * SCANNED_A_CORRUPT_NODE: scanned a corrupted node
227 * SCANNED_A_BAD_PAD_NODE: scanned a padding node with invalid pad length
228 *
229 * Greater than zero means: 'scanned that number of padding bytes'
230 */
231enum {
232 SCANNED_GARBAGE = 0,
233 SCANNED_EMPTY_SPACE = -1,
234 SCANNED_A_NODE = -2,
235 SCANNED_A_CORRUPT_NODE = -3,
236 SCANNED_A_BAD_PAD_NODE = -4,
237};
238
239/*
240 * LPT cnode flag bits.
241 *
242 * DIRTY_CNODE: cnode is dirty
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300243 * OBSOLETE_CNODE: cnode is being committed and has been copied (or deleted),
Artem Bityutskiy37662442011-05-30 14:51:20 +0300244 * so it can (and must) be freed when the commit is finished
245 * COW_CNODE: cnode is being committed and must be copied before writing
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300246 */
247enum {
248 DIRTY_CNODE = 0,
Artem Bityutskiy37662442011-05-30 14:51:20 +0300249 OBSOLETE_CNODE = 1,
250 COW_CNODE = 2,
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300251};
252
253/*
254 * Dirty flag bits (lpt_drty_flgs) for LPT special nodes.
255 *
256 * LTAB_DIRTY: ltab node is dirty
257 * LSAVE_DIRTY: lsave node is dirty
258 */
259enum {
260 LTAB_DIRTY = 1,
261 LSAVE_DIRTY = 2,
262};
263
264/*
265 * Return codes used by the garbage collector.
266 * @LEB_FREED: the logical eraseblock was freed and is ready to use
267 * @LEB_FREED_IDX: indexing LEB was freed and can be used only after the commit
268 * @LEB_RETAINED: the logical eraseblock was freed and retained for GC purposes
269 */
270enum {
271 LEB_FREED,
272 LEB_FREED_IDX,
273 LEB_RETAINED,
274};
275
276/**
277 * struct ubifs_old_idx - index node obsoleted since last commit start.
278 * @rb: rb-tree node
279 * @lnum: LEB number of obsoleted index node
280 * @offs: offset of obsoleted index node
281 */
282struct ubifs_old_idx {
283 struct rb_node rb;
284 int lnum;
285 int offs;
286};
287
288/* The below union makes it easier to deal with keys */
289union ubifs_key {
Artem Bityutskiy7ca58ba2012-02-29 18:43:01 +0200290 uint8_t u8[UBIFS_SK_LEN];
291 uint32_t u32[UBIFS_SK_LEN/4];
292 uint64_t u64[UBIFS_SK_LEN/8];
293 __le32 j32[UBIFS_SK_LEN/4];
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300294};
295
296/**
297 * struct ubifs_scan_node - UBIFS scanned node information.
298 * @list: list of scanned nodes
299 * @key: key of node scanned (if it has one)
300 * @sqnum: sequence number
301 * @type: type of node scanned
302 * @offs: offset with LEB of node scanned
303 * @len: length of node scanned
304 * @node: raw node
305 */
306struct ubifs_scan_node {
307 struct list_head list;
308 union ubifs_key key;
309 unsigned long long sqnum;
310 int type;
311 int offs;
312 int len;
313 void *node;
314};
315
316/**
317 * struct ubifs_scan_leb - UBIFS scanned LEB information.
318 * @lnum: logical eraseblock number
319 * @nodes_cnt: number of nodes scanned
320 * @nodes: list of struct ubifs_scan_node
321 * @endpt: end point (and therefore the start of empty space)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300322 * @buf: buffer containing entire LEB scanned
323 */
324struct ubifs_scan_leb {
325 int lnum;
326 int nodes_cnt;
327 struct list_head nodes;
328 int endpt;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300329 void *buf;
330};
331
332/**
333 * struct ubifs_gced_idx_leb - garbage-collected indexing LEB.
334 * @list: list
335 * @lnum: LEB number
336 * @unmap: OK to unmap this LEB
337 *
338 * This data structure is used to temporary store garbage-collected indexing
339 * LEBs - they are not released immediately, but only after the next commit.
340 * This is needed to guarantee recoverability.
341 */
342struct ubifs_gced_idx_leb {
343 struct list_head list;
344 int lnum;
345 int unmap;
346};
347
348/**
349 * struct ubifs_inode - UBIFS in-memory inode description.
350 * @vfs_inode: VFS inode description object
351 * @creat_sqnum: sequence number at time of creation
Artem Bityutskiyde94eb52008-07-22 13:06:20 +0300352 * @del_cmtno: commit number corresponding to the time the inode was deleted,
353 * protected by @c->commit_sem;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300354 * @xattr_size: summarized size of all extended attributes in bytes
355 * @xattr_cnt: count of extended attributes this inode has
356 * @xattr_names: sum of lengths of all extended attribute names belonging to
357 * this inode
358 * @dirty: non-zero if the inode is dirty
359 * @xattr: non-zero if this is an extended attribute inode
Artem Bityutskiy625bf372008-09-08 16:13:38 +0300360 * @bulk_read: non-zero if bulk-read should be used
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300361 * @ui_mutex: serializes inode write-back with the rest of VFS operations,
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300362 * serializes "clean <-> dirty" state changes, serializes bulk-read,
Artem Bityutskiyba60eca2008-09-08 16:38:01 +0300363 * protects @dirty, @bulk_read, @ui_size, and @xattr_size
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300364 * @ui_lock: protects @synced_i_size
365 * @synced_i_size: synchronized size of inode, i.e. the value of inode size
366 * currently stored on the flash; used only for regular file
367 * inodes
368 * @ui_size: inode size used by UBIFS when writing to flash
369 * @flags: inode flags (@UBIFS_COMPR_FL, etc)
370 * @compr_type: default compression type used for this inode
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300371 * @last_page_read: page number of last page read (for bulk read)
372 * @read_in_a_row: number of consecutive pages read in a row (for bulk read)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300373 * @data_len: length of the data attached to the inode
374 * @data: inode's data
375 *
376 * @ui_mutex exists for two main reasons. At first it prevents inodes from
377 * being written back while UBIFS changing them, being in the middle of an VFS
378 * operation. This way UBIFS makes sure the inode fields are consistent. For
379 * example, in 'ubifs_rename()' we change 3 inodes simultaneously, and
380 * write-back must not write any of them before we have finished.
381 *
382 * The second reason is budgeting - UBIFS has to budget all operations. If an
383 * operation is going to mark an inode dirty, it has to allocate budget for
384 * this. It cannot just mark it dirty because there is no guarantee there will
385 * be enough flash space to write the inode back later. This means UBIFS has
386 * to have full control over inode "clean <-> dirty" transitions (and pages
387 * actually). But unfortunately, VFS marks inodes dirty in many places, and it
388 * does not ask the file-system if it is allowed to do so (there is a notifier,
389 * but it is not enough), i.e., there is no mechanism to synchronize with this.
390 * So UBIFS has its own inode dirty flag and its own mutex to serialize
391 * "clean <-> dirty" transitions.
392 *
393 * The @synced_i_size field is used to make sure we never write pages which are
394 * beyond last synchronized inode size. See 'ubifs_writepage()' for more
395 * information.
396 *
397 * The @ui_size is a "shadow" variable for @inode->i_size and UBIFS uses
398 * @ui_size instead of @inode->i_size. The reason for this is that UBIFS cannot
399 * make sure @inode->i_size is always changed under @ui_mutex, because it
Artem Bityutskiyc4361572011-03-25 15:27:40 +0200400 * cannot call 'truncate_setsize()' with @ui_mutex locked, because it would
401 * deadlock with 'ubifs_writepage()' (see file.c). All the other inode fields
402 * are changed under @ui_mutex, so they do not need "shadow" fields. Note, one
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300403 * could consider to rework locking and base it on "shadow" fields.
404 */
405struct ubifs_inode {
406 struct inode vfs_inode;
Adrian Hunterbc8133552008-07-23 15:23:11 +0300407 unsigned long long creat_sqnum;
408 unsigned long long del_cmtno;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300409 unsigned int xattr_size;
410 unsigned int xattr_cnt;
411 unsigned int xattr_names;
412 unsigned int dirty:1;
413 unsigned int xattr:1;
Artem Bityutskiy625bf372008-09-08 16:13:38 +0300414 unsigned int bulk_read:1;
Artem Bityutskiya1dc080c22008-11-01 14:20:50 +0200415 unsigned int compr_type:2;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300416 struct mutex ui_mutex;
417 spinlock_t ui_lock;
418 loff_t synced_i_size;
419 loff_t ui_size;
420 int flags;
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300421 pgoff_t last_page_read;
422 pgoff_t read_in_a_row;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300423 int data_len;
424 void *data;
425};
426
427/**
428 * struct ubifs_unclean_leb - records a LEB recovered under read-only mode.
429 * @list: list
430 * @lnum: LEB number of recovered LEB
431 * @endpt: offset where recovery ended
432 *
433 * This structure records a LEB identified during recovery that needs to be
434 * cleaned but was not because UBIFS was mounted read-only. The information
435 * is used to clean the LEB when remounting to read-write mode.
436 */
437struct ubifs_unclean_leb {
438 struct list_head list;
439 int lnum;
440 int endpt;
441};
442
443/*
444 * LEB properties flags.
445 *
446 * LPROPS_UNCAT: not categorized
Artem Bityutskiy70782022009-01-19 19:57:27 +0200447 * LPROPS_DIRTY: dirty > free, dirty >= @c->dead_wm, not index
Artem Bityutskiy21a60252008-12-12 11:13:17 -0500448 * LPROPS_DIRTY_IDX: dirty + free > @c->min_idx_node_sze and index
Artem Bityutskiy70782022009-01-19 19:57:27 +0200449 * LPROPS_FREE: free > 0, dirty < @c->dead_wm, not empty, not index
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300450 * LPROPS_HEAP_CNT: number of heaps used for storing categorized LEBs
451 * LPROPS_EMPTY: LEB is empty, not taken
452 * LPROPS_FREEABLE: free + dirty == leb_size, not index, not taken
453 * LPROPS_FRDI_IDX: free + dirty == leb_size and index, may be taken
454 * LPROPS_CAT_MASK: mask for the LEB categories above
455 * LPROPS_TAKEN: LEB was taken (this flag is not saved on the media)
456 * LPROPS_INDEX: LEB contains indexing nodes (this flag also exists on flash)
457 */
458enum {
459 LPROPS_UNCAT = 0,
460 LPROPS_DIRTY = 1,
461 LPROPS_DIRTY_IDX = 2,
462 LPROPS_FREE = 3,
463 LPROPS_HEAP_CNT = 3,
464 LPROPS_EMPTY = 4,
465 LPROPS_FREEABLE = 5,
466 LPROPS_FRDI_IDX = 6,
467 LPROPS_CAT_MASK = 15,
468 LPROPS_TAKEN = 16,
469 LPROPS_INDEX = 32,
470};
471
472/**
473 * struct ubifs_lprops - logical eraseblock properties.
474 * @free: amount of free space in bytes
475 * @dirty: amount of dirty space in bytes
476 * @flags: LEB properties flags (see above)
477 * @lnum: LEB number
478 * @list: list of same-category lprops (for LPROPS_EMPTY and LPROPS_FREEABLE)
479 * @hpos: heap position in heap of same-category lprops (other categories)
480 */
481struct ubifs_lprops {
482 int free;
483 int dirty;
484 int flags;
485 int lnum;
486 union {
487 struct list_head list;
488 int hpos;
489 };
490};
491
492/**
493 * struct ubifs_lpt_lprops - LPT logical eraseblock properties.
494 * @free: amount of free space in bytes
495 * @dirty: amount of dirty space in bytes
496 * @tgc: trivial GC flag (1 => unmap after commit end)
497 * @cmt: commit flag (1 => reserved for commit)
498 */
499struct ubifs_lpt_lprops {
500 int free;
501 int dirty;
Artem Bityutskiyf92b9822008-12-28 11:34:26 +0200502 unsigned tgc:1;
503 unsigned cmt:1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300504};
505
506/**
507 * struct ubifs_lp_stats - statistics of eraseblocks in the main area.
508 * @empty_lebs: number of empty LEBs
509 * @taken_empty_lebs: number of taken LEBs
510 * @idx_lebs: number of indexing LEBs
Artem Bityutskiyd3cf5022008-12-16 17:52:35 +0200511 * @total_free: total free space in bytes (includes all LEBs)
512 * @total_dirty: total dirty space in bytes (includes all LEBs)
513 * @total_used: total used space in bytes (does not include index LEBs)
514 * @total_dead: total dead space in bytes (does not include index LEBs)
515 * @total_dark: total dark space in bytes (does not include index LEBs)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300516 *
Artem Bityutskiyd3cf5022008-12-16 17:52:35 +0200517 * The @taken_empty_lebs field counts the LEBs that are in the transient state
518 * of having been "taken" for use but not yet written to. @taken_empty_lebs is
519 * needed to account correctly for @gc_lnum, otherwise @empty_lebs could be
520 * used by itself (in which case 'unused_lebs' would be a better name). In the
521 * case of @gc_lnum, it is "taken" at mount time or whenever a LEB is retained
522 * by GC, but unlike other empty LEBs that are "taken", it may not be written
523 * straight away (i.e. before the next commit start or unmount), so either
524 * @gc_lnum must be specially accounted for, or the current approach followed
525 * i.e. count it under @taken_empty_lebs.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300526 *
Artem Bityutskiyd3cf5022008-12-16 17:52:35 +0200527 * @empty_lebs includes @taken_empty_lebs.
528 *
529 * @total_used, @total_dead and @total_dark fields do not account indexing
530 * LEBs.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300531 */
532struct ubifs_lp_stats {
533 int empty_lebs;
534 int taken_empty_lebs;
535 int idx_lebs;
536 long long total_free;
537 long long total_dirty;
538 long long total_used;
539 long long total_dead;
540 long long total_dark;
541};
542
543struct ubifs_nnode;
544
545/**
546 * struct ubifs_cnode - LEB Properties Tree common node.
547 * @parent: parent nnode
548 * @cnext: next cnode to commit
549 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE)
550 * @iip: index in parent
551 * @level: level in the tree (zero for pnodes, greater than zero for nnodes)
552 * @num: node number
553 */
554struct ubifs_cnode {
555 struct ubifs_nnode *parent;
556 struct ubifs_cnode *cnext;
557 unsigned long flags;
558 int iip;
559 int level;
560 int num;
561};
562
563/**
564 * struct ubifs_pnode - LEB Properties Tree leaf node.
565 * @parent: parent nnode
566 * @cnext: next cnode to commit
567 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE)
568 * @iip: index in parent
569 * @level: level in the tree (always zero for pnodes)
570 * @num: node number
571 * @lprops: LEB properties array
572 */
573struct ubifs_pnode {
574 struct ubifs_nnode *parent;
575 struct ubifs_cnode *cnext;
576 unsigned long flags;
577 int iip;
578 int level;
579 int num;
580 struct ubifs_lprops lprops[UBIFS_LPT_FANOUT];
581};
582
583/**
584 * struct ubifs_nbranch - LEB Properties Tree internal node branch.
585 * @lnum: LEB number of child
586 * @offs: offset of child
587 * @nnode: nnode child
588 * @pnode: pnode child
589 * @cnode: cnode child
590 */
591struct ubifs_nbranch {
592 int lnum;
593 int offs;
594 union {
595 struct ubifs_nnode *nnode;
596 struct ubifs_pnode *pnode;
597 struct ubifs_cnode *cnode;
598 };
599};
600
601/**
602 * struct ubifs_nnode - LEB Properties Tree internal node.
603 * @parent: parent nnode
604 * @cnext: next cnode to commit
605 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE)
606 * @iip: index in parent
607 * @level: level in the tree (always greater than zero for nnodes)
608 * @num: node number
609 * @nbranch: branches to child nodes
610 */
611struct ubifs_nnode {
612 struct ubifs_nnode *parent;
613 struct ubifs_cnode *cnext;
614 unsigned long flags;
615 int iip;
616 int level;
617 int num;
618 struct ubifs_nbranch nbranch[UBIFS_LPT_FANOUT];
619};
620
621/**
622 * struct ubifs_lpt_heap - heap of categorized lprops.
623 * @arr: heap array
624 * @cnt: number in heap
625 * @max_cnt: maximum number allowed in heap
626 *
627 * There are %LPROPS_HEAP_CNT heaps.
628 */
629struct ubifs_lpt_heap {
630 struct ubifs_lprops **arr;
631 int cnt;
632 int max_cnt;
633};
634
635/*
636 * Return codes for LPT scan callback function.
637 *
638 * LPT_SCAN_CONTINUE: continue scanning
639 * LPT_SCAN_ADD: add the LEB properties scanned to the tree in memory
640 * LPT_SCAN_STOP: stop scanning
641 */
642enum {
643 LPT_SCAN_CONTINUE = 0,
644 LPT_SCAN_ADD = 1,
645 LPT_SCAN_STOP = 2,
646};
647
648struct ubifs_info;
649
650/* Callback used by the 'ubifs_lpt_scan_nolock()' function */
651typedef int (*ubifs_lpt_scan_callback)(struct ubifs_info *c,
652 const struct ubifs_lprops *lprops,
653 int in_tree, void *data);
654
655/**
656 * struct ubifs_wbuf - UBIFS write-buffer.
657 * @c: UBIFS file-system description object
658 * @buf: write-buffer (of min. flash I/O unit size)
659 * @lnum: logical eraseblock number the write-buffer points to
660 * @offs: write-buffer offset in this logical eraseblock
661 * @avail: number of bytes available in the write-buffer
662 * @used: number of used bytes in the write-buffer
Artem Bityutskiy3c89f392011-02-01 19:02:49 +0200663 * @size: write-buffer size (in [@c->min_io_size, @c->max_write_size] range)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300664 * @jhead: journal head the mutex belongs to (note, needed only to shut lockdep
665 * up by 'mutex_lock_nested()).
666 * @sync_callback: write-buffer synchronization callback
667 * @io_mutex: serializes write-buffer I/O
668 * @lock: serializes @buf, @lnum, @offs, @avail, @used, @next_ino and @inodes
669 * fields
Artem Bityutskiyf2c5dbd2009-05-28 16:24:15 +0300670 * @softlimit: soft write-buffer timeout interval
Yannick Guerrinid3f9db02015-03-06 23:14:39 +0100671 * @delta: hard and soft timeouts delta (the timer expire interval is @softlimit
Artem Bityutskiyf2c5dbd2009-05-28 16:24:15 +0300672 * and @softlimit + @delta)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300673 * @timer: write-buffer timer
Adrian Hunter681947d2009-06-24 09:59:38 +0300674 * @no_timer: non-zero if this write-buffer does not have a timer
675 * @need_sync: non-zero if the timer expired and the wbuf needs sync'ing
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300676 * @next_ino: points to the next position of the following inode number
677 * @inodes: stores the inode numbers of the nodes which are in wbuf
678 *
679 * The write-buffer synchronization callback is called when the write-buffer is
680 * synchronized in order to notify how much space was wasted due to
681 * write-buffer padding and how much free space is left in the LEB.
682 *
683 * Note: the fields @buf, @lnum, @offs, @avail and @used can be read under
684 * spin-lock or mutex because they are written under both mutex and spin-lock.
685 * @buf is appended to under mutex but overwritten under both mutex and
686 * spin-lock. Thus the data between @buf and @buf + @used can be read under
687 * spinlock.
688 */
689struct ubifs_wbuf {
690 struct ubifs_info *c;
691 void *buf;
692 int lnum;
693 int offs;
694 int avail;
695 int used;
Artem Bityutskiy3c89f392011-02-01 19:02:49 +0200696 int size;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300697 int jhead;
698 int (*sync_callback)(struct ubifs_info *c, int lnum, int free, int pad);
699 struct mutex io_mutex;
700 spinlock_t lock;
Artem Bityutskiyf2c5dbd2009-05-28 16:24:15 +0300701 ktime_t softlimit;
702 unsigned long long delta;
703 struct hrtimer timer;
Artem Bityutskiy0b335b92009-06-23 12:30:43 +0300704 unsigned int no_timer:1;
705 unsigned int need_sync:1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300706 int next_ino;
707 ino_t *inodes;
708};
709
710/**
711 * struct ubifs_bud - bud logical eraseblock.
712 * @lnum: logical eraseblock number
713 * @start: where the (uncommitted) bud data starts
714 * @jhead: journal head number this bud belongs to
715 * @list: link in the list buds belonging to the same journal head
716 * @rb: link in the tree of all buds
717 */
718struct ubifs_bud {
719 int lnum;
720 int start;
721 int jhead;
722 struct list_head list;
723 struct rb_node rb;
724};
725
726/**
727 * struct ubifs_jhead - journal head.
728 * @wbuf: head's write-buffer
729 * @buds_list: list of bud LEBs belonging to this journal head
Artem Bityutskiy1a0b0692011-05-26 08:26:05 +0300730 * @grouped: non-zero if UBIFS groups nodes when writing to this journal head
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300731 *
732 * Note, the @buds list is protected by the @c->buds_lock.
733 */
734struct ubifs_jhead {
735 struct ubifs_wbuf wbuf;
736 struct list_head buds_list;
Artem Bityutskiy1a0b0692011-05-26 08:26:05 +0300737 unsigned int grouped:1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300738};
739
740/**
741 * struct ubifs_zbranch - key/coordinate/length branch stored in znodes.
742 * @key: key
743 * @znode: znode address in memory
Artem Bityutskiybe616782008-09-08 18:08:39 +0300744 * @lnum: LEB number of the target node (indexing node or data node)
745 * @offs: target node offset within @lnum
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300746 * @len: target node length
747 */
748struct ubifs_zbranch {
749 union ubifs_key key;
750 union {
751 struct ubifs_znode *znode;
752 void *leaf;
753 };
754 int lnum;
755 int offs;
756 int len;
757};
758
759/**
760 * struct ubifs_znode - in-memory representation of an indexing node.
761 * @parent: parent znode or NULL if it is the root
762 * @cnext: next znode to commit
763 * @flags: znode flags (%DIRTY_ZNODE, %COW_ZNODE or %OBSOLETE_ZNODE)
764 * @time: last access time (seconds)
765 * @level: level of the entry in the TNC tree
766 * @child_cnt: count of child znodes
767 * @iip: index in parent's zbranch array
768 * @alt: lower bound of key range has altered i.e. child inserted at slot 0
769 * @lnum: LEB number of the corresponding indexing node
770 * @offs: offset of the corresponding indexing node
771 * @len: length of the corresponding indexing node
772 * @zbranch: array of znode branches (@c->fanout elements)
Artem Bityutskiyf70b7e52012-05-16 19:53:46 +0300773 *
774 * Note! The @lnum, @offs, and @len fields are not really needed - we have them
775 * only for internal consistency check. They could be removed to save some RAM.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300776 */
777struct ubifs_znode {
778 struct ubifs_znode *parent;
779 struct ubifs_znode *cnext;
780 unsigned long flags;
781 unsigned long time;
782 int level;
783 int child_cnt;
784 int iip;
785 int alt;
Artem Bityutskiyf70b7e52012-05-16 19:53:46 +0300786 int lnum;
787 int offs;
788 int len;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300789 struct ubifs_zbranch zbranch[];
790};
791
792/**
Artem Bityutskiy39ce81c2008-11-18 18:09:49 +0200793 * struct bu_info - bulk-read information.
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300794 * @key: first data node key
795 * @zbranch: zbranches of data nodes to bulk read
796 * @buf: buffer to read into
797 * @buf_len: buffer length
798 * @gc_seq: GC sequence number to detect races with GC
799 * @cnt: number of data nodes for bulk read
800 * @blk_cnt: number of data blocks including holes
801 * @oef: end of file reached
802 */
803struct bu_info {
804 union ubifs_key key;
805 struct ubifs_zbranch zbranch[UBIFS_MAX_BULK_READ];
806 void *buf;
807 int buf_len;
808 int gc_seq;
809 int cnt;
810 int blk_cnt;
811 int eof;
812};
813
814/**
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300815 * struct ubifs_node_range - node length range description data structure.
816 * @len: fixed node length
817 * @min_len: minimum possible node length
818 * @max_len: maximum possible node length
819 *
820 * If @max_len is %0, the node has fixed length @len.
821 */
822struct ubifs_node_range {
823 union {
824 int len;
825 int min_len;
826 };
827 int max_len;
828};
829
830/**
831 * struct ubifs_compressor - UBIFS compressor description structure.
832 * @compr_type: compressor type (%UBIFS_COMPR_LZO, etc)
833 * @cc: cryptoapi compressor handle
834 * @comp_mutex: mutex used during compression
835 * @decomp_mutex: mutex used during decompression
836 * @name: compressor name
837 * @capi_name: cryptoapi compressor name
838 */
839struct ubifs_compressor {
840 int compr_type;
841 struct crypto_comp *cc;
842 struct mutex *comp_mutex;
843 struct mutex *decomp_mutex;
844 const char *name;
845 const char *capi_name;
846};
847
848/**
849 * struct ubifs_budget_req - budget requirements of an operation.
850 *
Artem Bityutskiyde94eb52008-07-22 13:06:20 +0300851 * @fast: non-zero if the budgeting should try to acquire budget quickly and
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300852 * should not try to call write-back
853 * @recalculate: non-zero if @idx_growth, @data_growth, and @dd_growth fields
854 * have to be re-calculated
855 * @new_page: non-zero if the operation adds a new page
856 * @dirtied_page: non-zero if the operation makes a page dirty
857 * @new_dent: non-zero if the operation adds a new directory entry
858 * @mod_dent: non-zero if the operation removes or modifies an existing
859 * directory entry
860 * @new_ino: non-zero if the operation adds a new inode
861 * @new_ino_d: now much data newly created inode contains
862 * @dirtied_ino: how many inodes the operation makes dirty
863 * @dirtied_ino_d: now much data dirtied inode contains
864 * @idx_growth: how much the index will supposedly grow
865 * @data_growth: how much new data the operation will supposedly add
866 * @dd_growth: how much data that makes other data dirty the operation will
867 * supposedly add
868 *
869 * @idx_growth, @data_growth and @dd_growth are not used in budget request. The
870 * budgeting subsystem caches index and data growth values there to avoid
871 * re-calculating them when the budget is released. However, if @idx_growth is
872 * %-1, it is calculated by the release function using other fields.
873 *
874 * An inode may contain 4KiB of data at max., thus the widths of @new_ino_d
875 * is 13 bits, and @dirtied_ino_d - 15, because up to 4 inodes may be made
876 * dirty by the re-name operation.
Artem Bityutskiydab4b4d2008-07-24 14:52:45 +0300877 *
878 * Note, UBIFS aligns node lengths to 8-bytes boundary, so the requester has to
879 * make sure the amount of inode data which contribute to @new_ino_d and
880 * @dirtied_ino_d fields are aligned.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300881 */
882struct ubifs_budget_req {
883 unsigned int fast:1;
884 unsigned int recalculate:1;
Artem Bityutskiy547000d2008-07-24 14:42:05 +0300885#ifndef UBIFS_DEBUG
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300886 unsigned int new_page:1;
887 unsigned int dirtied_page:1;
888 unsigned int new_dent:1;
889 unsigned int mod_dent:1;
890 unsigned int new_ino:1;
891 unsigned int new_ino_d:13;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300892 unsigned int dirtied_ino:4;
893 unsigned int dirtied_ino_d:15;
894#else
895 /* Not bit-fields to check for overflows */
Artem Bityutskiy547000d2008-07-24 14:42:05 +0300896 unsigned int new_page;
897 unsigned int dirtied_page;
898 unsigned int new_dent;
899 unsigned int mod_dent;
900 unsigned int new_ino;
901 unsigned int new_ino_d;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300902 unsigned int dirtied_ino;
903 unsigned int dirtied_ino_d;
904#endif
905 int idx_growth;
906 int data_growth;
907 int dd_growth;
908};
909
910/**
911 * struct ubifs_orphan - stores the inode number of an orphan.
912 * @rb: rb-tree node of rb-tree of orphans sorted by inode number
913 * @list: list head of list of orphans in order added
914 * @new_list: list head of list of orphans added since the last commit
915 * @cnext: next orphan to commit
916 * @dnext: next orphan to delete
917 * @inum: inode number
918 * @new: %1 => added since the last commit, otherwise %0
Adam Thomas2928f0d2013-02-02 22:32:31 +0000919 * @cmt: %1 => commit pending, otherwise %0
Adam Thomas8afd5002013-02-02 22:35:08 +0000920 * @del: %1 => delete pending, otherwise %0
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300921 */
922struct ubifs_orphan {
923 struct rb_node rb;
924 struct list_head list;
925 struct list_head new_list;
926 struct ubifs_orphan *cnext;
927 struct ubifs_orphan *dnext;
928 ino_t inum;
Adam Thomas2928f0d2013-02-02 22:32:31 +0000929 unsigned new:1;
930 unsigned cmt:1;
Adam Thomas8afd5002013-02-02 22:35:08 +0000931 unsigned del:1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300932};
933
934/**
935 * struct ubifs_mount_opts - UBIFS-specific mount options information.
936 * @unmount_mode: selected unmount mode (%0 default, %1 normal, %2 fast)
Yannick Guerrinid3f9db02015-03-06 23:14:39 +0100937 * @bulk_read: enable/disable bulk-reads (%0 default, %1 disable, %2 enable)
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200938 * @chk_data_crc: enable/disable CRC data checking when reading data nodes
Yannick Guerrinid3f9db02015-03-06 23:14:39 +0100939 * (%0 default, %1 disable, %2 enable)
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200940 * @override_compr: override default compressor (%0 - do not override and use
941 * superblock compressor, %1 - override and use compressor
942 * specified in @compr_type)
943 * @compr_type: compressor type to override the superblock compressor with
944 * (%UBIFS_COMPR_NONE, etc)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300945 */
946struct ubifs_mount_opts {
947 unsigned int unmount_mode:2;
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300948 unsigned int bulk_read:2;
Adrian Hunter2953e732008-09-04 16:26:00 +0300949 unsigned int chk_data_crc:2;
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200950 unsigned int override_compr:1;
951 unsigned int compr_type:2;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300952};
953
Artem Bityutskiyb1375452011-03-29 18:04:05 +0300954/**
955 * struct ubifs_budg_info - UBIFS budgeting information.
956 * @idx_growth: amount of bytes budgeted for index growth
957 * @data_growth: amount of bytes budgeted for cached data
958 * @dd_growth: amount of bytes budgeted for cached data that will make
959 * other data dirty
960 * @uncommitted_idx: amount of bytes were budgeted for growth of the index, but
961 * which still have to be taken into account because the index
962 * has not been committed so far
963 * @old_idx_sz: size of index on flash
964 * @min_idx_lebs: minimum number of LEBs required for the index
965 * @nospace: non-zero if the file-system does not have flash space (used as
966 * optimization)
967 * @nospace_rp: the same as @nospace, but additionally means that even reserved
968 * pool is full
Yannick Guerrinid3f9db02015-03-06 23:14:39 +0100969 * @page_budget: budget for a page (constant, never changed after mount)
970 * @inode_budget: budget for an inode (constant, never changed after mount)
971 * @dent_budget: budget for a directory entry (constant, never changed after
Artem Bityutskiyb1375452011-03-29 18:04:05 +0300972 * mount)
973 */
974struct ubifs_budg_info {
975 long long idx_growth;
976 long long data_growth;
977 long long dd_growth;
978 long long uncommitted_idx;
979 unsigned long long old_idx_sz;
980 int min_idx_lebs;
981 unsigned int nospace:1;
982 unsigned int nospace_rp:1;
983 int page_budget;
984 int inode_budget;
985 int dent_budget;
986};
987
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +0300988struct ubifs_debug_info;
989
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300990/**
991 * struct ubifs_info - UBIFS file-system description data structure
992 * (per-superblock).
993 * @vfs_sb: VFS @struct super_block object
Artem Bityutskiyde94eb52008-07-22 13:06:20 +0300994 * @bdi: backing device info object to make VFS happy and disable read-ahead
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300995 *
996 * @highest_inum: highest used inode number
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300997 * @max_sqnum: current global sequence number
Artem Bityutskiy014eb042008-07-21 17:14:29 +0300998 * @cmt_no: commit number of the last successfully completed commit, protected
999 * by @commit_sem
Adrian Hunter81ffa382008-08-01 15:35:08 +03001000 * @cnt_lock: protects @highest_inum and @max_sqnum counters
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001001 * @fmt_version: UBIFS on-flash format version
Artem Bityutskiy963f0cf2009-03-26 12:51:21 +02001002 * @ro_compat_version: R/O compatibility version
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001003 * @uuid: UUID from super block
1004 *
1005 * @lhead_lnum: log head logical eraseblock number
1006 * @lhead_offs: log head offset
1007 * @ltail_lnum: log tail logical eraseblock number (offset is always 0)
1008 * @log_mutex: protects the log, @lhead_lnum, @lhead_offs, @ltail_lnum, and
1009 * @bud_bytes
1010 * @min_log_bytes: minimum required number of bytes in the log
1011 * @cmt_bud_bytes: used during commit to temporarily amount of bytes in
1012 * committed buds
1013 *
1014 * @buds: tree of all buds indexed by bud LEB number
1015 * @bud_bytes: how many bytes of flash is used by buds
1016 * @buds_lock: protects the @buds tree, @bud_bytes, and per-journal head bud
1017 * lists
1018 * @jhead_cnt: count of journal heads
1019 * @jheads: journal heads (head zero is base head)
1020 * @max_bud_bytes: maximum number of bytes allowed in buds
1021 * @bg_bud_bytes: number of bud bytes when background commit is initiated
1022 * @old_buds: buds to be released after commit ends
1023 * @max_bud_cnt: maximum number of buds
1024 *
1025 * @commit_sem: synchronizes committer with other processes
1026 * @cmt_state: commit state
1027 * @cs_lock: commit state lock
1028 * @cmt_wq: wait queue to sleep on if the log is full and a commit is running
Artem Bityutskiy625bf372008-09-08 16:13:38 +03001029 *
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001030 * @big_lpt: flag that LPT is too big to write whole during commit
Matthew L. Creech9f58d352011-05-05 16:33:20 -04001031 * @space_fixup: flag indicating that free space in LEBs needs to be cleaned up
Artem Bityutskiy625bf372008-09-08 16:13:38 +03001032 * @no_chk_data_crc: do not check CRCs when reading data nodes (except during
1033 * recovery)
1034 * @bulk_read: enable bulk-reads
Artem Bityutskiya1dc080c22008-11-01 14:20:50 +02001035 * @default_compr: default compression algorithm (%UBIFS_COMPR_LZO, etc)
Artem Bityutskiy963f0cf2009-03-26 12:51:21 +02001036 * @rw_incompat: the media is not R/W compatible
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001037 *
1038 * @tnc_mutex: protects the Tree Node Cache (TNC), @zroot, @cnext, @enext, and
1039 * @calc_idx_sz
1040 * @zroot: zbranch which points to the root index node and znode
1041 * @cnext: next znode to commit
1042 * @enext: next znode to commit to empty space
1043 * @gap_lebs: array of LEBs used by the in-gaps commit method
1044 * @cbuf: commit buffer
1045 * @ileb_buf: buffer for commit in-the-gaps method
1046 * @ileb_len: length of data in ileb_buf
1047 * @ihead_lnum: LEB number of index head
1048 * @ihead_offs: offset of index head
1049 * @ilebs: pre-allocated index LEBs
1050 * @ileb_cnt: number of pre-allocated index LEBs
1051 * @ileb_nxt: next pre-allocated index LEBs
1052 * @old_idx: tree of index nodes obsoleted since the last commit start
1053 * @bottom_up_buf: a buffer which is used by 'dirty_cow_bottom_up()' in tnc.c
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001054 *
1055 * @mst_node: master node
1056 * @mst_offs: offset of valid master node
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001057 *
Artem Bityutskiy6c0c42c2008-11-18 20:20:05 +02001058 * @max_bu_buf_len: maximum bulk-read buffer length
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001059 * @bu_mutex: protects the pre-allocated bulk-read buffer and @c->bu
1060 * @bu: pre-allocated bulk-read information
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001061 *
Matthew L. Creechd8829622011-03-04 17:55:02 -05001062 * @write_reserve_mutex: protects @write_reserve_buf
1063 * @write_reserve_buf: on the write path we allocate memory, which might
1064 * sometimes be unavailable, in which case we use this
1065 * write reserve buffer
1066 *
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001067 * @log_lebs: number of logical eraseblocks in the log
1068 * @log_bytes: log size in bytes
1069 * @log_last: last LEB of the log
1070 * @lpt_lebs: number of LEBs used for lprops table
1071 * @lpt_first: first LEB of the lprops table area
1072 * @lpt_last: last LEB of the lprops table area
1073 * @orph_lebs: number of LEBs used for the orphan area
1074 * @orph_first: first LEB of the orphan area
1075 * @orph_last: last LEB of the orphan area
1076 * @main_lebs: count of LEBs in the main area
1077 * @main_first: first LEB of the main area
1078 * @main_bytes: main area size in bytes
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001079 *
1080 * @key_hash_type: type of the key hash
1081 * @key_hash: direntry key hash function
1082 * @key_fmt: key format
1083 * @key_len: key length
1084 * @fanout: fanout of the index tree (number of links per indexing node)
1085 *
1086 * @min_io_size: minimal input/output unit size
1087 * @min_io_shift: number of bits in @min_io_size minus one
Artem Bityutskiy3e8e2e02011-01-30 18:58:32 +02001088 * @max_write_size: maximum amount of bytes the underlying flash can write at a
1089 * time (MTD write buffer size)
1090 * @max_write_shift: number of bits in @max_write_size minus one
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001091 * @leb_size: logical eraseblock size in bytes
Artem Bityutskiyca2ec612011-02-14 15:17:55 +02001092 * @leb_start: starting offset of logical eraseblocks within physical
1093 * eraseblocks
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001094 * @half_leb_size: half LEB size
Artem Bityutskiyfb1cd012009-03-16 09:56:57 +02001095 * @idx_leb_size: how many bytes of an LEB are effectively available when it is
1096 * used to store indexing nodes (@leb_size - @max_idx_node_sz)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001097 * @leb_cnt: count of logical eraseblocks
1098 * @max_leb_cnt: maximum count of logical eraseblocks
1099 * @old_leb_cnt: count of logical eraseblocks before re-size
1100 * @ro_media: the underlying UBI volume is read-only
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001101 * @ro_mount: the file-system was mounted as read-only
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001102 * @ro_error: UBIFS switched to R/O mode because an error happened
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001103 *
1104 * @dirty_pg_cnt: number of dirty pages (not used)
1105 * @dirty_zn_cnt: number of dirty znodes
1106 * @clean_zn_cnt: number of clean znodes
1107 *
Artem Bityutskiyb1375452011-03-29 18:04:05 +03001108 * @space_lock: protects @bi and @lst
1109 * @lst: lprops statistics
1110 * @bi: budgeting information
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001111 * @calc_idx_sz: temporary variable which is used to calculate new index size
1112 * (contains accurate new index size at end of TNC commit start)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001113 *
1114 * @ref_node_alsz: size of the LEB reference node aligned to the min. flash
Artem Bityutskiyb1375452011-03-29 18:04:05 +03001115 * I/O unit
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001116 * @mst_node_alsz: master node aligned size
1117 * @min_idx_node_sz: minimum indexing node aligned on 8-bytes boundary
1118 * @max_idx_node_sz: maximum indexing node aligned on 8-bytes boundary
1119 * @max_inode_sz: maximum possible inode size in bytes
1120 * @max_znode_sz: size of znode in bytes
Artem Bityutskiy9bbb5722008-08-22 18:23:22 +03001121 *
1122 * @leb_overhead: how many bytes are wasted in an LEB when it is filled with
1123 * data nodes of maximum size - used in free space reporting
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001124 * @dead_wm: LEB dead space watermark
1125 * @dark_wm: LEB dark space watermark
1126 * @block_cnt: count of 4KiB blocks on the FS
1127 *
1128 * @ranges: UBIFS node length ranges
1129 * @ubi: UBI volume descriptor
1130 * @di: UBI device information
1131 * @vi: UBI volume information
1132 *
1133 * @orph_tree: rb-tree of orphan inode numbers
1134 * @orph_list: list of orphan inode numbers in order added
1135 * @orph_new: list of orphan inode numbers added since last commit
1136 * @orph_cnext: next orphan to commit
1137 * @orph_dnext: next orphan to delete
1138 * @orphan_lock: lock for orph_tree and orph_new
1139 * @orph_buf: buffer for orphan nodes
1140 * @new_orphans: number of orphans since last commit
1141 * @cmt_orphans: number of orphans being committed
1142 * @tot_orphans: number of orphans in the rb_tree
1143 * @max_orphans: maximum number of orphans allowed
1144 * @ohead_lnum: orphan head LEB number
1145 * @ohead_offs: orphan head offset
1146 * @no_orphs: non-zero if there are no orphans
1147 *
1148 * @bgt: UBIFS background thread
1149 * @bgt_name: background thread name
1150 * @need_bgt: if background thread should run
1151 * @need_wbuf_sync: if write-buffers have to be synchronized
1152 *
1153 * @gc_lnum: LEB number used for garbage collection
1154 * @sbuf: a buffer of LEB size used by GC and replay for scanning
1155 * @idx_gc: list of index LEBs that have been garbage collected
1156 * @idx_gc_cnt: number of elements on the idx_gc list
Adrian Hunter601c0bc2008-08-22 14:23:35 +03001157 * @gc_seq: incremented for every non-index LEB garbage collected
1158 * @gced_lnum: last non-index LEB that was garbage collected
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001159 *
1160 * @infos_list: links all 'ubifs_info' objects
1161 * @umount_mutex: serializes shrinker and un-mount
1162 * @shrinker_run_no: shrinker run number
1163 *
1164 * @space_bits: number of bits needed to record free or dirty space
1165 * @lpt_lnum_bits: number of bits needed to record a LEB number in the LPT
1166 * @lpt_offs_bits: number of bits needed to record an offset in the LPT
1167 * @lpt_spc_bits: number of bits needed to space in the LPT
1168 * @pcnt_bits: number of bits needed to record pnode or nnode number
1169 * @lnum_bits: number of bits needed to record LEB number
1170 * @nnode_sz: size of on-flash nnode
1171 * @pnode_sz: size of on-flash pnode
1172 * @ltab_sz: size of on-flash LPT lprops table
1173 * @lsave_sz: size of on-flash LPT save table
1174 * @pnode_cnt: number of pnodes
1175 * @nnode_cnt: number of nnodes
1176 * @lpt_hght: height of the LPT
1177 * @pnodes_have: number of pnodes in memory
1178 *
1179 * @lp_mutex: protects lprops table and all the other lprops-related fields
1180 * @lpt_lnum: LEB number of the root nnode of the LPT
1181 * @lpt_offs: offset of the root nnode of the LPT
1182 * @nhead_lnum: LEB number of LPT head
1183 * @nhead_offs: offset of LPT head
1184 * @lpt_drty_flgs: dirty flags for LPT special nodes e.g. ltab
1185 * @dirty_nn_cnt: number of dirty nnodes
1186 * @dirty_pn_cnt: number of dirty pnodes
Adrian Hunter73944a62008-09-12 18:13:31 +03001187 * @check_lpt_free: flag that indicates LPT GC may be needed
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001188 * @lpt_sz: LPT size
1189 * @lpt_nod_buf: buffer for an on-flash nnode or pnode
1190 * @lpt_buf: buffer of LEB size used by LPT
1191 * @nroot: address in memory of the root nnode of the LPT
1192 * @lpt_cnext: next LPT node to commit
1193 * @lpt_heap: array of heaps of categorized lprops
1194 * @dirty_idx: a (reverse sorted) copy of the LPROPS_DIRTY_IDX heap as at
1195 * previous commit start
1196 * @uncat_list: list of un-categorized LEBs
1197 * @empty_list: list of empty LEBs
Artem Bityutskiyfb1cd012009-03-16 09:56:57 +02001198 * @freeable_list: list of freeable non-index LEBs (free + dirty == @leb_size)
1199 * @frdi_idx_list: list of freeable index LEBs (free + dirty == @leb_size)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001200 * @freeable_cnt: number of freeable LEBs in @freeable_list
Artem Bityutskiy98a1eeb2012-10-10 10:55:28 +03001201 * @in_a_category_cnt: count of lprops which are in a certain category, which
1202 * basically meants that they were loaded from the flash
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001203 *
1204 * @ltab_lnum: LEB number of LPT's own lprops table
1205 * @ltab_offs: offset of LPT's own lprops table
1206 * @ltab: LPT's own lprops table
1207 * @ltab_cmt: LPT's own lprops table (commit copy)
1208 * @lsave_cnt: number of LEB numbers in LPT's save table
1209 * @lsave_lnum: LEB number of LPT's save table
1210 * @lsave_offs: offset of LPT's save table
1211 * @lsave: LPT's save table
1212 * @lscan_lnum: LEB number of last LPT scan
1213 *
1214 * @rp_size: size of the reserved pool in bytes
1215 * @report_rp_size: size of the reserved pool reported to user-space
1216 * @rp_uid: reserved pool user ID
1217 * @rp_gid: reserved pool group ID
1218 *
Artem Bityutskiyd8cdda32011-01-17 20:27:45 +02001219 * @empty: %1 if the UBI device is empty
1220 * @need_recovery: %1 if the file-system needs recovery
1221 * @replaying: %1 during journal replay
Artem Bityutskiy18d1d7f2011-01-17 22:27:56 +02001222 * @mounting: %1 while mounting
Daniel Golle90bea5a32014-06-02 15:51:10 +02001223 * @probing: %1 while attempting to mount if MS_SILENT mount flag is set
Artem Bityutskiyd8cdda32011-01-17 20:27:45 +02001224 * @remounting_rw: %1 while re-mounting from R/O mode to R/W mode
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001225 * @replay_list: temporary list used during journal replay
1226 * @replay_buds: list of buds to replay
1227 * @cs_sqnum: sequence number of first node in the log (commit start node)
1228 * @replay_sqnum: sequence number of node currently being replayed
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001229 * @unclean_leb_list: LEBs to recover when re-mounting R/O mounted FS to R/W
1230 * mode
1231 * @rcvrd_mst_node: recovered master node to write when re-mounting R/O mounted
1232 * FS to R/W mode
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001233 * @size_tree: inode size information for recovery
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001234 * @mount_opts: UBIFS-specific mount options
1235 *
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001236 * @dbg: debugging-related information
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001237 */
1238struct ubifs_info {
1239 struct super_block *vfs_sb;
1240 struct backing_dev_info bdi;
1241
1242 ino_t highest_inum;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001243 unsigned long long max_sqnum;
1244 unsigned long long cmt_no;
1245 spinlock_t cnt_lock;
1246 int fmt_version;
Artem Bityutskiy963f0cf2009-03-26 12:51:21 +02001247 int ro_compat_version;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001248 unsigned char uuid[16];
1249
1250 int lhead_lnum;
1251 int lhead_offs;
1252 int ltail_lnum;
1253 struct mutex log_mutex;
1254 int min_log_bytes;
1255 long long cmt_bud_bytes;
1256
1257 struct rb_root buds;
1258 long long bud_bytes;
1259 spinlock_t buds_lock;
1260 int jhead_cnt;
1261 struct ubifs_jhead *jheads;
1262 long long max_bud_bytes;
1263 long long bg_bud_bytes;
1264 struct list_head old_buds;
1265 int max_bud_cnt;
1266
1267 struct rw_semaphore commit_sem;
1268 int cmt_state;
1269 spinlock_t cs_lock;
1270 wait_queue_head_t cmt_wq;
Artem Bityutskiy625bf372008-09-08 16:13:38 +03001271
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001272 unsigned int big_lpt:1;
Matthew L. Creech9f58d352011-05-05 16:33:20 -04001273 unsigned int space_fixup:1;
Artem Bityutskiy625bf372008-09-08 16:13:38 +03001274 unsigned int no_chk_data_crc:1;
1275 unsigned int bulk_read:1;
Artem Bityutskiya1dc080c22008-11-01 14:20:50 +02001276 unsigned int default_compr:2;
Artem Bityutskiy963f0cf2009-03-26 12:51:21 +02001277 unsigned int rw_incompat:1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001278
1279 struct mutex tnc_mutex;
1280 struct ubifs_zbranch zroot;
1281 struct ubifs_znode *cnext;
1282 struct ubifs_znode *enext;
1283 int *gap_lebs;
1284 void *cbuf;
1285 void *ileb_buf;
1286 int ileb_len;
1287 int ihead_lnum;
1288 int ihead_offs;
1289 int *ilebs;
1290 int ileb_cnt;
1291 int ileb_nxt;
1292 struct rb_root old_idx;
1293 int *bottom_up_buf;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001294
1295 struct ubifs_mst_node *mst_node;
1296 int mst_offs;
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001297
Artem Bityutskiy6c0c42c2008-11-18 20:20:05 +02001298 int max_bu_buf_len;
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001299 struct mutex bu_mutex;
1300 struct bu_info bu;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001301
Matthew L. Creechd8829622011-03-04 17:55:02 -05001302 struct mutex write_reserve_mutex;
1303 void *write_reserve_buf;
1304
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001305 int log_lebs;
1306 long long log_bytes;
1307 int log_last;
1308 int lpt_lebs;
1309 int lpt_first;
1310 int lpt_last;
1311 int orph_lebs;
1312 int orph_first;
1313 int orph_last;
1314 int main_lebs;
1315 int main_first;
1316 long long main_bytes;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001317
1318 uint8_t key_hash_type;
1319 uint32_t (*key_hash)(const char *str, int len);
1320 int key_fmt;
1321 int key_len;
1322 int fanout;
1323
1324 int min_io_size;
1325 int min_io_shift;
Artem Bityutskiy3e8e2e02011-01-30 18:58:32 +02001326 int max_write_size;
1327 int max_write_shift;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001328 int leb_size;
Artem Bityutskiyca2ec612011-02-14 15:17:55 +02001329 int leb_start;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001330 int half_leb_size;
Artem Bityutskiyfb1cd012009-03-16 09:56:57 +02001331 int idx_leb_size;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001332 int leb_cnt;
1333 int max_leb_cnt;
1334 int old_leb_cnt;
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001335 unsigned int ro_media:1;
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001336 unsigned int ro_mount:1;
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001337 unsigned int ro_error:1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001338
1339 atomic_long_t dirty_pg_cnt;
1340 atomic_long_t dirty_zn_cnt;
1341 atomic_long_t clean_zn_cnt;
1342
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001343 spinlock_t space_lock;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001344 struct ubifs_lp_stats lst;
Artem Bityutskiyb1375452011-03-29 18:04:05 +03001345 struct ubifs_budg_info bi;
1346 unsigned long long calc_idx_sz;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001347
1348 int ref_node_alsz;
1349 int mst_node_alsz;
1350 int min_idx_node_sz;
1351 int max_idx_node_sz;
1352 long long max_inode_sz;
1353 int max_znode_sz;
Artem Bityutskiy9bbb5722008-08-22 18:23:22 +03001354
1355 int leb_overhead;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001356 int dead_wm;
1357 int dark_wm;
1358 int block_cnt;
1359
1360 struct ubifs_node_range ranges[UBIFS_NODE_TYPES_CNT];
1361 struct ubi_volume_desc *ubi;
1362 struct ubi_device_info di;
1363 struct ubi_volume_info vi;
1364
1365 struct rb_root orph_tree;
1366 struct list_head orph_list;
1367 struct list_head orph_new;
1368 struct ubifs_orphan *orph_cnext;
1369 struct ubifs_orphan *orph_dnext;
1370 spinlock_t orphan_lock;
1371 void *orph_buf;
1372 int new_orphans;
1373 int cmt_orphans;
1374 int tot_orphans;
1375 int max_orphans;
1376 int ohead_lnum;
1377 int ohead_offs;
1378 int no_orphs;
1379
1380 struct task_struct *bgt;
1381 char bgt_name[sizeof(BGT_NAME_PATTERN) + 9];
1382 int need_bgt;
1383 int need_wbuf_sync;
1384
1385 int gc_lnum;
1386 void *sbuf;
1387 struct list_head idx_gc;
1388 int idx_gc_cnt;
Artem Bityutskiyf92b9822008-12-28 11:34:26 +02001389 int gc_seq;
1390 int gced_lnum;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001391
1392 struct list_head infos_list;
1393 struct mutex umount_mutex;
1394 unsigned int shrinker_run_no;
1395
1396 int space_bits;
1397 int lpt_lnum_bits;
1398 int lpt_offs_bits;
1399 int lpt_spc_bits;
1400 int pcnt_bits;
1401 int lnum_bits;
1402 int nnode_sz;
1403 int pnode_sz;
1404 int ltab_sz;
1405 int lsave_sz;
1406 int pnode_cnt;
1407 int nnode_cnt;
1408 int lpt_hght;
1409 int pnodes_have;
1410
1411 struct mutex lp_mutex;
1412 int lpt_lnum;
1413 int lpt_offs;
1414 int nhead_lnum;
1415 int nhead_offs;
1416 int lpt_drty_flgs;
1417 int dirty_nn_cnt;
1418 int dirty_pn_cnt;
Adrian Hunter73944a62008-09-12 18:13:31 +03001419 int check_lpt_free;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001420 long long lpt_sz;
1421 void *lpt_nod_buf;
1422 void *lpt_buf;
1423 struct ubifs_nnode *nroot;
1424 struct ubifs_cnode *lpt_cnext;
1425 struct ubifs_lpt_heap lpt_heap[LPROPS_HEAP_CNT];
1426 struct ubifs_lpt_heap dirty_idx;
1427 struct list_head uncat_list;
1428 struct list_head empty_list;
1429 struct list_head freeable_list;
1430 struct list_head frdi_idx_list;
1431 int freeable_cnt;
Artem Bityutskiy98a1eeb2012-10-10 10:55:28 +03001432 int in_a_category_cnt;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001433
1434 int ltab_lnum;
1435 int ltab_offs;
1436 struct ubifs_lpt_lprops *ltab;
1437 struct ubifs_lpt_lprops *ltab_cmt;
1438 int lsave_cnt;
1439 int lsave_lnum;
1440 int lsave_offs;
1441 int *lsave;
1442 int lscan_lnum;
1443
1444 long long rp_size;
1445 long long report_rp_size;
Eric W. Biederman39241be2012-02-07 15:50:56 -08001446 kuid_t rp_uid;
1447 kgid_t rp_gid;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001448
1449 /* The below fields are used only during mounting and re-mounting */
Artem Bityutskiyd8cdda32011-01-17 20:27:45 +02001450 unsigned int empty:1;
1451 unsigned int need_recovery:1;
1452 unsigned int replaying:1;
Artem Bityutskiy18d1d7f2011-01-17 22:27:56 +02001453 unsigned int mounting:1;
Artem Bityutskiyd8cdda32011-01-17 20:27:45 +02001454 unsigned int remounting_rw:1;
Daniel Golle90bea5a32014-06-02 15:51:10 +02001455 unsigned int probing:1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001456 struct list_head replay_list;
1457 struct list_head replay_buds;
1458 unsigned long long cs_sqnum;
1459 unsigned long long replay_sqnum;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001460 struct list_head unclean_leb_list;
1461 struct ubifs_mst_node *rcvrd_mst_node;
1462 struct rb_root size_tree;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001463 struct ubifs_mount_opts mount_opts;
1464
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001465 struct ubifs_debug_info *dbg;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001466};
1467
1468extern struct list_head ubifs_infos;
1469extern spinlock_t ubifs_infos_lock;
1470extern atomic_long_t ubifs_clean_zn_cnt;
1471extern struct kmem_cache *ubifs_inode_slab;
Artem Bityutskiye8b81562009-01-15 17:43:23 +02001472extern const struct super_operations ubifs_super_operations;
Subodh Nijsured7f0b702014-10-31 13:50:30 -05001473extern const struct xattr_handler *ubifs_xattr_handlers[];
Artem Bityutskiye8b81562009-01-15 17:43:23 +02001474extern const struct address_space_operations ubifs_file_address_operations;
1475extern const struct file_operations ubifs_file_operations;
1476extern const struct inode_operations ubifs_file_inode_operations;
1477extern const struct file_operations ubifs_dir_operations;
1478extern const struct inode_operations ubifs_dir_inode_operations;
1479extern const struct inode_operations ubifs_symlink_inode_operations;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001480extern struct backing_dev_info ubifs_backing_dev_info;
1481extern struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
1482
1483/* io.c */
Adrian Hunterff46d7b2008-07-21 15:39:05 +03001484void ubifs_ro_mode(struct ubifs_info *c, int err);
Artem Bityutskiy83cef702011-06-03 13:45:09 +03001485int ubifs_leb_read(const struct ubifs_info *c, int lnum, void *buf, int offs,
1486 int len, int even_ebadmsg);
1487int ubifs_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs,
Richard Weinbergerb36a2612012-05-14 17:55:51 +02001488 int len);
1489int ubifs_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len);
Artem Bityutskiy83cef702011-06-03 13:45:09 +03001490int ubifs_leb_unmap(struct ubifs_info *c, int lnum);
Richard Weinbergerb36a2612012-05-14 17:55:51 +02001491int ubifs_leb_map(struct ubifs_info *c, int lnum);
Artem Bityutskiy83cef702011-06-03 13:45:09 +03001492int ubifs_is_mapped(const struct ubifs_info *c, int lnum);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001493int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len);
Richard Weinbergerb36a2612012-05-14 17:55:51 +02001494int ubifs_wbuf_seek_nolock(struct ubifs_wbuf *wbuf, int lnum, int offs);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001495int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf);
1496int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len,
1497 int lnum, int offs);
1498int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len,
1499 int lnum, int offs);
1500int ubifs_write_node(struct ubifs_info *c, void *node, int len, int lnum,
Richard Weinbergerb36a2612012-05-14 17:55:51 +02001501 int offs);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001502int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum,
Artem Bityutskiy6f7ab6d2009-01-27 16:12:31 +02001503 int offs, int quiet, int must_chk_crc);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001504void ubifs_prepare_node(struct ubifs_info *c, void *buf, int len, int pad);
1505void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last);
1506int ubifs_io_init(struct ubifs_info *c);
1507void ubifs_pad(const struct ubifs_info *c, void *buf, int pad);
1508int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf);
1509int ubifs_bg_wbufs_sync(struct ubifs_info *c);
1510void ubifs_wbuf_add_ino_nolock(struct ubifs_wbuf *wbuf, ino_t inum);
1511int ubifs_sync_wbufs_by_inode(struct ubifs_info *c, struct inode *inode);
1512
1513/* scan.c */
1514struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
Artem Bityutskiy348709b2009-08-25 15:00:55 +03001515 int offs, void *sbuf, int quiet);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001516void ubifs_scan_destroy(struct ubifs_scan_leb *sleb);
1517int ubifs_scan_a_node(const struct ubifs_info *c, void *buf, int len, int lnum,
1518 int offs, int quiet);
1519struct ubifs_scan_leb *ubifs_start_scan(const struct ubifs_info *c, int lnum,
1520 int offs, void *sbuf);
1521void ubifs_end_scan(const struct ubifs_info *c, struct ubifs_scan_leb *sleb,
1522 int lnum, int offs);
1523int ubifs_add_snod(const struct ubifs_info *c, struct ubifs_scan_leb *sleb,
1524 void *buf, int offs);
1525void ubifs_scanned_corruption(const struct ubifs_info *c, int lnum, int offs,
1526 void *buf);
1527
1528/* log.c */
1529void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud);
1530void ubifs_create_buds_lists(struct ubifs_info *c);
1531int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs);
1532struct ubifs_bud *ubifs_search_bud(struct ubifs_info *c, int lnum);
1533struct ubifs_wbuf *ubifs_get_wbuf(struct ubifs_info *c, int lnum);
1534int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum);
1535int ubifs_log_end_commit(struct ubifs_info *c, int new_ltail_lnum);
1536int ubifs_log_post_commit(struct ubifs_info *c, int old_ltail_lnum);
1537int ubifs_consolidate_log(struct ubifs_info *c);
1538
1539/* journal.c */
1540int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir,
1541 const struct qstr *nm, const struct inode *inode,
1542 int deletion, int xent);
1543int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode,
1544 const union ubifs_key *key, const void *buf, int len);
Artem Bityutskiy1f286812008-07-22 12:06:13 +03001545int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode);
Artem Bityutskiyde94eb52008-07-22 13:06:20 +03001546int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001547int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
1548 const struct dentry *old_dentry,
1549 const struct inode *new_dir,
1550 const struct dentry *new_dentry, int sync);
1551int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode,
1552 loff_t old_size, loff_t new_size);
1553int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host,
1554 const struct inode *inode, const struct qstr *nm);
1555int ubifs_jnl_change_xattr(struct ubifs_info *c, const struct inode *inode1,
1556 const struct inode *inode2);
1557
1558/* budget.c */
1559int ubifs_budget_space(struct ubifs_info *c, struct ubifs_budget_req *req);
1560void ubifs_release_budget(struct ubifs_info *c, struct ubifs_budget_req *req);
1561void ubifs_release_dirty_inode_budget(struct ubifs_info *c,
1562 struct ubifs_inode *ui);
1563int ubifs_budget_inode_op(struct ubifs_info *c, struct inode *inode,
1564 struct ubifs_budget_req *req);
1565void ubifs_release_ino_dirty(struct ubifs_info *c, struct inode *inode,
1566 struct ubifs_budget_req *req);
1567void ubifs_cancel_ino_op(struct ubifs_info *c, struct inode *inode,
1568 struct ubifs_budget_req *req);
Artem Bityutskiy7dad1812008-08-25 18:58:19 +03001569long long ubifs_get_free_space(struct ubifs_info *c);
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001570long long ubifs_get_free_space_nolock(struct ubifs_info *c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001571int ubifs_calc_min_idx_lebs(struct ubifs_info *c);
1572void ubifs_convert_page_budget(struct ubifs_info *c);
Artem Bityutskiy4d61db42008-12-18 14:06:51 +02001573long long ubifs_reported_space(const struct ubifs_info *c, long long free);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001574long long ubifs_calc_available(const struct ubifs_info *c, int min_idx_lebs);
1575
1576/* find.c */
Artem Bityutskiy3edaae72009-03-03 19:22:53 +02001577int ubifs_find_free_space(struct ubifs_info *c, int min_space, int *offs,
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001578 int squeeze);
1579int ubifs_find_free_leb_for_idx(struct ubifs_info *c);
1580int ubifs_find_dirty_leb(struct ubifs_info *c, struct ubifs_lprops *ret_lp,
1581 int min_space, int pick_free);
1582int ubifs_find_dirty_idx_leb(struct ubifs_info *c);
1583int ubifs_save_dirty_idx_lnums(struct ubifs_info *c);
1584
1585/* tnc.c */
1586int ubifs_lookup_level0(struct ubifs_info *c, const union ubifs_key *key,
1587 struct ubifs_znode **zn, int *n);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001588int ubifs_tnc_lookup_nm(struct ubifs_info *c, const union ubifs_key *key,
1589 void *node, const struct qstr *nm);
1590int ubifs_tnc_locate(struct ubifs_info *c, const union ubifs_key *key,
1591 void *node, int *lnum, int *offs);
1592int ubifs_tnc_add(struct ubifs_info *c, const union ubifs_key *key, int lnum,
1593 int offs, int len);
1594int ubifs_tnc_replace(struct ubifs_info *c, const union ubifs_key *key,
1595 int old_lnum, int old_offs, int lnum, int offs, int len);
1596int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key,
1597 int lnum, int offs, int len, const struct qstr *nm);
1598int ubifs_tnc_remove(struct ubifs_info *c, const union ubifs_key *key);
1599int ubifs_tnc_remove_nm(struct ubifs_info *c, const union ubifs_key *key,
1600 const struct qstr *nm);
1601int ubifs_tnc_remove_range(struct ubifs_info *c, union ubifs_key *from_key,
1602 union ubifs_key *to_key);
1603int ubifs_tnc_remove_ino(struct ubifs_info *c, ino_t inum);
1604struct ubifs_dent_node *ubifs_tnc_next_ent(struct ubifs_info *c,
1605 union ubifs_key *key,
1606 const struct qstr *nm);
1607void ubifs_tnc_close(struct ubifs_info *c);
1608int ubifs_tnc_has_node(struct ubifs_info *c, union ubifs_key *key, int level,
1609 int lnum, int offs, int is_idx);
1610int ubifs_dirty_idx_node(struct ubifs_info *c, union ubifs_key *key, int level,
1611 int lnum, int offs);
1612/* Shared by tnc.c for tnc_commit.c */
1613void destroy_old_idx(struct ubifs_info *c);
1614int is_idx_node_in_tnc(struct ubifs_info *c, union ubifs_key *key, int level,
1615 int lnum, int offs);
1616int insert_old_idx_znode(struct ubifs_info *c, struct ubifs_znode *znode);
Adrian Hunter4793e7c2008-09-02 16:29:46 +03001617int ubifs_tnc_get_bu_keys(struct ubifs_info *c, struct bu_info *bu);
1618int ubifs_tnc_bulk_read(struct ubifs_info *c, struct bu_info *bu);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001619
1620/* tnc_misc.c */
1621struct ubifs_znode *ubifs_tnc_levelorder_next(struct ubifs_znode *zr,
1622 struct ubifs_znode *znode);
1623int ubifs_search_zbranch(const struct ubifs_info *c,
1624 const struct ubifs_znode *znode,
1625 const union ubifs_key *key, int *n);
1626struct ubifs_znode *ubifs_tnc_postorder_first(struct ubifs_znode *znode);
1627struct ubifs_znode *ubifs_tnc_postorder_next(struct ubifs_znode *znode);
1628long ubifs_destroy_tnc_subtree(struct ubifs_znode *zr);
1629struct ubifs_znode *ubifs_load_znode(struct ubifs_info *c,
1630 struct ubifs_zbranch *zbr,
1631 struct ubifs_znode *parent, int iip);
1632int ubifs_tnc_read_node(struct ubifs_info *c, struct ubifs_zbranch *zbr,
1633 void *node);
1634
1635/* tnc_commit.c */
1636int ubifs_tnc_start_commit(struct ubifs_info *c, struct ubifs_zbranch *zroot);
1637int ubifs_tnc_end_commit(struct ubifs_info *c);
1638
1639/* shrinker.c */
Dave Chinner1ab6c492013-08-28 10:18:09 +10001640unsigned long ubifs_shrink_scan(struct shrinker *shrink,
1641 struct shrink_control *sc);
1642unsigned long ubifs_shrink_count(struct shrinker *shrink,
1643 struct shrink_control *sc);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001644
1645/* commit.c */
1646int ubifs_bg_thread(void *info);
1647void ubifs_commit_required(struct ubifs_info *c);
1648void ubifs_request_bg_commit(struct ubifs_info *c);
1649int ubifs_run_commit(struct ubifs_info *c);
1650void ubifs_recovery_commit(struct ubifs_info *c);
1651int ubifs_gc_should_commit(struct ubifs_info *c);
1652void ubifs_wait_for_commit(struct ubifs_info *c);
1653
1654/* master.c */
1655int ubifs_read_master(struct ubifs_info *c);
1656int ubifs_write_master(struct ubifs_info *c);
1657
1658/* sb.c */
1659int ubifs_read_superblock(struct ubifs_info *c);
1660struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c);
1661int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup);
Matthew L. Creech6554a652011-05-06 18:58:22 -04001662int ubifs_fixup_free_space(struct ubifs_info *c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001663
1664/* replay.c */
1665int ubifs_validate_entry(struct ubifs_info *c,
1666 const struct ubifs_dent_node *dent);
1667int ubifs_replay_journal(struct ubifs_info *c);
1668
1669/* gc.c */
1670int ubifs_garbage_collect(struct ubifs_info *c, int anyway);
1671int ubifs_gc_start_commit(struct ubifs_info *c);
1672int ubifs_gc_end_commit(struct ubifs_info *c);
Adrian Hunterb466f172009-01-29 12:59:33 +02001673void ubifs_destroy_idx_gc(struct ubifs_info *c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001674int ubifs_get_idx_gc_leb(struct ubifs_info *c);
1675int ubifs_garbage_collect_leb(struct ubifs_info *c, struct ubifs_lprops *lp);
1676
1677/* orphan.c */
1678int ubifs_add_orphan(struct ubifs_info *c, ino_t inum);
1679void ubifs_delete_orphan(struct ubifs_info *c, ino_t inum);
1680int ubifs_orphan_start_commit(struct ubifs_info *c);
1681int ubifs_orphan_end_commit(struct ubifs_info *c);
1682int ubifs_mount_orphans(struct ubifs_info *c, int unclean, int read_only);
Adrian Hunter49d128a2009-01-26 10:55:40 +02001683int ubifs_clear_orphans(struct ubifs_info *c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001684
1685/* lpt.c */
1686int ubifs_calc_lpt_geom(struct ubifs_info *c);
1687int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
1688 int *lpt_lebs, int *big_lpt);
1689int ubifs_lpt_init(struct ubifs_info *c, int rd, int wr);
1690struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum);
1691struct ubifs_lprops *ubifs_lpt_lookup_dirty(struct ubifs_info *c, int lnum);
1692int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum,
1693 ubifs_lpt_scan_callback scan_cb, void *data);
1694
1695/* Shared by lpt.c for lpt_commit.c */
1696void ubifs_pack_lsave(struct ubifs_info *c, void *buf, int *lsave);
1697void ubifs_pack_ltab(struct ubifs_info *c, void *buf,
1698 struct ubifs_lpt_lprops *ltab);
1699void ubifs_pack_pnode(struct ubifs_info *c, void *buf,
1700 struct ubifs_pnode *pnode);
1701void ubifs_pack_nnode(struct ubifs_info *c, void *buf,
1702 struct ubifs_nnode *nnode);
1703struct ubifs_pnode *ubifs_get_pnode(struct ubifs_info *c,
1704 struct ubifs_nnode *parent, int iip);
1705struct ubifs_nnode *ubifs_get_nnode(struct ubifs_info *c,
1706 struct ubifs_nnode *parent, int iip);
1707int ubifs_read_nnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip);
1708void ubifs_add_lpt_dirt(struct ubifs_info *c, int lnum, int dirty);
1709void ubifs_add_nnode_dirt(struct ubifs_info *c, struct ubifs_nnode *nnode);
1710uint32_t ubifs_unpack_bits(uint8_t **addr, int *pos, int nrbits);
1711struct ubifs_nnode *ubifs_first_nnode(struct ubifs_info *c, int *hght);
Artem Bityutskiy2ba5f7a2008-10-31 17:32:30 +02001712/* Needed only in debugging code in lpt_commit.c */
1713int ubifs_unpack_nnode(const struct ubifs_info *c, void *buf,
1714 struct ubifs_nnode *nnode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001715
1716/* lpt_commit.c */
1717int ubifs_lpt_start_commit(struct ubifs_info *c);
1718int ubifs_lpt_end_commit(struct ubifs_info *c);
1719int ubifs_lpt_post_commit(struct ubifs_info *c);
1720void ubifs_lpt_free(struct ubifs_info *c, int wr_only);
1721
1722/* lprops.c */
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001723const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c,
1724 const struct ubifs_lprops *lp,
1725 int free, int dirty, int flags,
1726 int idx_gc_cnt);
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001727void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *lst);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001728void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops,
1729 int cat);
1730void ubifs_replace_cat(struct ubifs_info *c, struct ubifs_lprops *old_lprops,
1731 struct ubifs_lprops *new_lprops);
1732void ubifs_ensure_cat(struct ubifs_info *c, struct ubifs_lprops *lprops);
1733int ubifs_categorize_lprops(const struct ubifs_info *c,
1734 const struct ubifs_lprops *lprops);
1735int ubifs_change_one_lp(struct ubifs_info *c, int lnum, int free, int dirty,
1736 int flags_set, int flags_clean, int idx_gc_cnt);
1737int ubifs_update_one_lp(struct ubifs_info *c, int lnum, int free, int dirty,
1738 int flags_set, int flags_clean);
1739int ubifs_read_one_lp(struct ubifs_info *c, int lnum, struct ubifs_lprops *lp);
1740const struct ubifs_lprops *ubifs_fast_find_free(struct ubifs_info *c);
1741const struct ubifs_lprops *ubifs_fast_find_empty(struct ubifs_info *c);
1742const struct ubifs_lprops *ubifs_fast_find_freeable(struct ubifs_info *c);
1743const struct ubifs_lprops *ubifs_fast_find_frdi_idx(struct ubifs_info *c);
Artem Bityutskiybe9e62a2008-12-28 10:17:23 +02001744int ubifs_calc_dark(const struct ubifs_info *c, int spc);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001745
1746/* file.c */
Josef Bacik02c24a82011-07-16 20:44:56 -04001747int ubifs_fsync(struct file *file, loff_t start, loff_t end, int datasync);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001748int ubifs_setattr(struct dentry *dentry, struct iattr *attr);
1749
1750/* dir.c */
1751struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir,
Al Viroad44be52011-07-26 03:12:59 -04001752 umode_t mode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001753int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1754 struct kstat *stat);
1755
1756/* xattr.c */
1757int ubifs_setxattr(struct dentry *dentry, const char *name,
1758 const void *value, size_t size, int flags);
1759ssize_t ubifs_getxattr(struct dentry *dentry, const char *name, void *buf,
1760 size_t size);
1761ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1762int ubifs_removexattr(struct dentry *dentry, const char *name);
Subodh Nijsured7f0b702014-10-31 13:50:30 -05001763int ubifs_init_security(struct inode *dentry, struct inode *inode,
1764 const struct qstr *qstr);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001765
1766/* super.c */
1767struct inode *ubifs_iget(struct super_block *sb, unsigned long inum);
1768
1769/* recovery.c */
1770int ubifs_recover_master_node(struct ubifs_info *c);
1771int ubifs_write_rcvrd_mst_node(struct ubifs_info *c);
1772struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum,
Artem Bityutskiyefcfde52011-05-26 08:36:52 +03001773 int offs, void *sbuf, int jhead);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001774struct ubifs_scan_leb *ubifs_recover_log_leb(struct ubifs_info *c, int lnum,
1775 int offs, void *sbuf);
Artem Bityutskiy83cef702011-06-03 13:45:09 +03001776int ubifs_recover_inl_heads(struct ubifs_info *c, void *sbuf);
1777int ubifs_clean_lebs(struct ubifs_info *c, void *sbuf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001778int ubifs_rcvry_gc_commit(struct ubifs_info *c);
1779int ubifs_recover_size_accum(struct ubifs_info *c, union ubifs_key *key,
1780 int deletion, loff_t new_size);
1781int ubifs_recover_size(struct ubifs_info *c);
1782void ubifs_destroy_size_tree(struct ubifs_info *c);
1783
1784/* ioctl.c */
1785long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1786void ubifs_set_inode_flags(struct inode *inode);
1787#ifdef CONFIG_COMPAT
1788long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1789#endif
1790
1791/* compressor.c */
1792int __init ubifs_compressors_init(void);
Alexey Dobriyan995be042008-12-04 17:04:18 +03001793void ubifs_compressors_exit(void);
Sheng Yong235c3622015-03-20 10:39:42 +00001794void ubifs_compress(const struct ubifs_info *c, const void *in_buf, int in_len,
1795 void *out_buf, int *out_len, int *compr_type);
1796int ubifs_decompress(const struct ubifs_info *c, const void *buf, int len,
1797 void *out, int *out_len, int compr_type);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001798
1799#include "debug.h"
1800#include "misc.h"
1801#include "key.h"
1802
1803#endif /* !__UBIFS_H__ */