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Dave Kleikamp470decc2006-10-11 01:20:57 -07001/*
Mingming Caof7f4bcc2006-10-11 01:20:59 -07002 * linux/include/linux/jbd2.h
Dave Kleikamp470decc2006-10-11 01:20:57 -07003 *
4 * Written by Stephen C. Tweedie <sct@redhat.com>
5 *
6 * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved
7 *
8 * This file is part of the Linux kernel and is made available under
9 * the terms of the GNU General Public License, version 2, or at your
10 * option, any later version, incorporated herein by reference.
11 *
12 * Definitions for transaction data structures for the buffer cache
13 * filesystem journaling support.
14 */
15
Mingming Caocd02ff02007-10-16 18:38:25 -040016#ifndef _LINUX_JBD2_H
17#define _LINUX_JBD2_H
Dave Kleikamp470decc2006-10-11 01:20:57 -070018
19/* Allow this file to be included directly into e2fsprogs */
20#ifndef __KERNEL__
21#include "jfs_compat.h"
Mingming Caof7f4bcc2006-10-11 01:20:59 -070022#define JBD2_DEBUG
Dave Kleikamp470decc2006-10-11 01:20:57 -070023#else
24
25#include <linux/types.h>
26#include <linux/buffer_head.h>
27#include <linux/journal-head.h>
28#include <linux/stddef.h>
Dave Kleikamp470decc2006-10-11 01:20:57 -070029#include <linux/mutex.h>
30#include <linux/timer.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Darrick J. Wong01b5adc2012-05-27 07:50:56 -040032#include <crypto/hash.h>
Dave Kleikamp470decc2006-10-11 01:20:57 -070033#endif
34
35#define journal_oom_retry 1
36
37/*
Mingming Caocd02ff02007-10-16 18:38:25 -040038 * Define JBD2_PARANIOD_IOFAIL to cause a kernel BUG() if ext4 finds
Dave Kleikamp470decc2006-10-11 01:20:57 -070039 * certain classes of error which can occur due to failed IOs. Under
Mingming Caocd02ff02007-10-16 18:38:25 -040040 * normal use we want ext4 to continue after such errors, because
Dave Kleikamp470decc2006-10-11 01:20:57 -070041 * hardware _can_ fail, but for debugging purposes when running tests on
42 * known-good hardware we may want to trap these errors.
43 */
Mingming Caocd02ff02007-10-16 18:38:25 -040044#undef JBD2_PARANOID_IOFAIL
Dave Kleikamp470decc2006-10-11 01:20:57 -070045
46/*
47 * The default maximum commit age, in seconds.
48 */
Mingming Caocd02ff02007-10-16 18:38:25 -040049#define JBD2_DEFAULT_MAX_COMMIT_AGE 5
Dave Kleikamp470decc2006-10-11 01:20:57 -070050
Jose R. Santose23291b2007-07-18 08:57:06 -040051#ifdef CONFIG_JBD2_DEBUG
Dave Kleikamp470decc2006-10-11 01:20:57 -070052/*
Mingming Caocd02ff02007-10-16 18:38:25 -040053 * Define JBD2_EXPENSIVE_CHECKING to enable more expensive internal
Dave Kleikamp470decc2006-10-11 01:20:57 -070054 * consistency checks. By default we don't do this unless
Jose R. Santose23291b2007-07-18 08:57:06 -040055 * CONFIG_JBD2_DEBUG is on.
Dave Kleikamp470decc2006-10-11 01:20:57 -070056 */
Mingming Caocd02ff02007-10-16 18:38:25 -040057#define JBD2_EXPENSIVE_CHECKING
Theodore Ts'ob6e96d02013-02-09 16:29:20 -050058extern ushort jbd2_journal_enable_debug;
Paul Gortmaker169f1a22013-06-12 23:04:04 -040059void __jbd2_debug(int level, const char *file, const char *func,
60 unsigned int line, const char *fmt, ...);
Dave Kleikamp470decc2006-10-11 01:20:57 -070061
Paul Gortmaker169f1a22013-06-12 23:04:04 -040062#define jbd_debug(n, fmt, a...) \
63 __jbd2_debug((n), __FILE__, __func__, __LINE__, (fmt), ##a)
Dave Kleikamp470decc2006-10-11 01:20:57 -070064#else
Paul Gortmaker169f1a22013-06-12 23:04:04 -040065#define jbd_debug(n, fmt, a...) /**/
Dave Kleikamp470decc2006-10-11 01:20:57 -070066#endif
67
Theodore Ts'od2eecb02009-12-07 10:36:20 -050068extern void *jbd2_alloc(size_t size, gfp_t flags);
69extern void jbd2_free(void *ptr, size_t size);
Mingming Caoaf1e76d2007-10-16 18:38:25 -040070
Mingming Caof7f4bcc2006-10-11 01:20:59 -070071#define JBD2_MIN_JOURNAL_BLOCKS 1024
Dave Kleikamp470decc2006-10-11 01:20:57 -070072
73#ifdef __KERNEL__
74
75/**
76 * typedef handle_t - The handle_t type represents a single atomic update being performed by some process.
77 *
78 * All filesystem modifications made by the process go
79 * through this handle. Recursive operations (such as quota operations)
80 * are gathered into a single update.
81 *
82 * The buffer credits field is used to account for journaled buffers
83 * being modified by the running process. To ensure that there is
84 * enough log space for all outstanding operations, we need to limit the
85 * number of outstanding buffers possible at any time. When the
86 * operation completes, any buffer credits not used are credited back to
87 * the transaction, so that at all times we know how many buffers the
88 * outstanding updates on a transaction might possibly touch.
89 *
90 * This is an opaque datatype.
91 **/
Theodore Ts'o8aefcd52011-01-10 12:29:43 -050092typedef struct jbd2_journal_handle handle_t; /* Atomic operation type */
Dave Kleikamp470decc2006-10-11 01:20:57 -070093
94
95/**
96 * typedef journal_t - The journal_t maintains all of the journaling state information for a single filesystem.
97 *
98 * journal_t is linked to from the fs superblock structure.
99 *
100 * We use the journal_t to keep track of all outstanding transaction
101 * activity on the filesystem, and to manage the state of the log
102 * writing process.
103 *
104 * This is an opaque datatype.
105 **/
106typedef struct journal_s journal_t; /* Journal control structure */
107#endif
108
109/*
110 * Internal structures used by the logging mechanism:
111 */
112
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700113#define JBD2_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700114
115/*
116 * On-disk structures
117 */
118
119/*
120 * Descriptor block types:
121 */
122
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700123#define JBD2_DESCRIPTOR_BLOCK 1
124#define JBD2_COMMIT_BLOCK 2
125#define JBD2_SUPERBLOCK_V1 3
126#define JBD2_SUPERBLOCK_V2 4
127#define JBD2_REVOKE_BLOCK 5
Dave Kleikamp470decc2006-10-11 01:20:57 -0700128
129/*
130 * Standard header for all descriptor blocks:
131 */
132typedef struct journal_header_s
133{
134 __be32 h_magic;
135 __be32 h_blocktype;
136 __be32 h_sequence;
137} journal_header_t;
138
Girish Shilamkar818d2762008-01-28 23:58:27 -0500139/*
140 * Checksum types.
141 */
142#define JBD2_CRC32_CHKSUM 1
143#define JBD2_MD5_CHKSUM 2
144#define JBD2_SHA1_CHKSUM 3
Darrick J. Wong8f888ef2012-05-22 22:43:41 -0400145#define JBD2_CRC32C_CHKSUM 4
Girish Shilamkar818d2762008-01-28 23:58:27 -0500146
147#define JBD2_CRC32_CHKSUM_SIZE 4
148
149#define JBD2_CHECKSUM_BYTES (32 / sizeof(u32))
150/*
151 * Commit block header for storing transactional checksums:
Darrick J. Wong8f888ef2012-05-22 22:43:41 -0400152 *
153 * NOTE: If FEATURE_COMPAT_CHECKSUM (checksum v1) is set, the h_chksum*
154 * fields are used to store a checksum of the descriptor and data blocks.
155 *
156 * If FEATURE_INCOMPAT_CSUM_V2 (checksum v2) is set, then the h_chksum
157 * field is used to store crc32c(uuid+commit_block). Each journal metadata
158 * block gets its own checksum, and data block checksums are stored in
159 * journal_block_tag (in the descriptor). The other h_chksum* fields are
160 * not used.
161 *
162 * Checksum v1 and v2 are mutually exclusive features.
Girish Shilamkar818d2762008-01-28 23:58:27 -0500163 */
164struct commit_header {
165 __be32 h_magic;
166 __be32 h_blocktype;
167 __be32 h_sequence;
168 unsigned char h_chksum_type;
169 unsigned char h_chksum_size;
170 unsigned char h_padding[2];
171 __be32 h_chksum[JBD2_CHECKSUM_BYTES];
Theodore Ts'o736603a2008-07-11 19:27:31 -0400172 __be64 h_commit_sec;
173 __be32 h_commit_nsec;
Girish Shilamkar818d2762008-01-28 23:58:27 -0500174};
Dave Kleikamp470decc2006-10-11 01:20:57 -0700175
176/*
Zach Brownb517bea2006-10-11 01:21:08 -0700177 * The block tag: used to describe a single buffer in the journal.
178 * t_blocknr_high is only used if INCOMPAT_64BIT is set, so this
179 * raw struct shouldn't be used for pointer math or sizeof() - use
180 * journal_tag_bytes(journal) instead to compute this.
Dave Kleikamp470decc2006-10-11 01:20:57 -0700181 */
182typedef struct journal_block_tag_s
183{
184 __be32 t_blocknr; /* The on-disk block number */
Darrick J. Wong8f888ef2012-05-22 22:43:41 -0400185 __be16 t_checksum; /* truncated crc32c(uuid+seq+block) */
186 __be16 t_flags; /* See below */
Zach Brownb517bea2006-10-11 01:21:08 -0700187 __be32 t_blocknr_high; /* most-significant high 32bits. */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700188} journal_block_tag_t;
189
Mingming Caocd02ff02007-10-16 18:38:25 -0400190#define JBD2_TAG_SIZE32 (offsetof(journal_block_tag_t, t_blocknr_high))
191#define JBD2_TAG_SIZE64 (sizeof(journal_block_tag_t))
Zach Brownb517bea2006-10-11 01:21:08 -0700192
Darrick J. Wong8f888ef2012-05-22 22:43:41 -0400193/* Tail of descriptor block, for checksumming */
194struct jbd2_journal_block_tail {
195 __be32 t_checksum; /* crc32c(uuid+descr_block) */
196};
197
Dave Kleikamp470decc2006-10-11 01:20:57 -0700198/*
199 * The revoke descriptor: used on disk to describe a series of blocks to
200 * be revoked from the log
201 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700202typedef struct jbd2_journal_revoke_header_s
Dave Kleikamp470decc2006-10-11 01:20:57 -0700203{
204 journal_header_t r_header;
205 __be32 r_count; /* Count of bytes used in the block */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700206} jbd2_journal_revoke_header_t;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700207
Darrick J. Wong8f888ef2012-05-22 22:43:41 -0400208/* Tail of revoke block, for checksumming */
209struct jbd2_journal_revoke_tail {
210 __be32 r_checksum; /* crc32c(uuid+revoke_block) */
211};
Dave Kleikamp470decc2006-10-11 01:20:57 -0700212
213/* Definitions for the journal tag flags word: */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700214#define JBD2_FLAG_ESCAPE 1 /* on-disk block is escaped */
215#define JBD2_FLAG_SAME_UUID 2 /* block has same uuid as previous */
216#define JBD2_FLAG_DELETED 4 /* block deleted by this transaction */
217#define JBD2_FLAG_LAST_TAG 8 /* last tag in this descriptor block */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700218
219
220/*
221 * The journal superblock. All fields are in big-endian byte order.
222 */
223typedef struct journal_superblock_s
224{
225/* 0x0000 */
226 journal_header_t s_header;
227
228/* 0x000C */
229 /* Static information describing the journal */
230 __be32 s_blocksize; /* journal device blocksize */
231 __be32 s_maxlen; /* total blocks in journal file */
232 __be32 s_first; /* first block of log information */
233
234/* 0x0018 */
235 /* Dynamic information describing the current state of the log */
236 __be32 s_sequence; /* first commit ID expected in log */
237 __be32 s_start; /* blocknr of start of log */
238
239/* 0x0020 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700240 /* Error value, as set by jbd2_journal_abort(). */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700241 __be32 s_errno;
242
243/* 0x0024 */
244 /* Remaining fields are only valid in a version-2 superblock */
245 __be32 s_feature_compat; /* compatible feature set */
246 __be32 s_feature_incompat; /* incompatible feature set */
247 __be32 s_feature_ro_compat; /* readonly-compatible feature set */
248/* 0x0030 */
249 __u8 s_uuid[16]; /* 128-bit uuid for journal */
250
251/* 0x0040 */
252 __be32 s_nr_users; /* Nr of filesystems sharing log */
253
254 __be32 s_dynsuper; /* Blocknr of dynamic superblock copy*/
255
256/* 0x0048 */
257 __be32 s_max_transaction; /* Limit of journal blocks per trans.*/
258 __be32 s_max_trans_data; /* Limit of data blocks per trans. */
259
260/* 0x0050 */
Darrick J. Wong8f888ef2012-05-22 22:43:41 -0400261 __u8 s_checksum_type; /* checksum type */
262 __u8 s_padding2[3];
263 __u32 s_padding[42];
264 __be32 s_checksum; /* crc32c(superblock) */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700265
266/* 0x0100 */
267 __u8 s_users[16*48]; /* ids of all fs'es sharing the log */
268/* 0x0400 */
269} journal_superblock_t;
270
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700271#define JBD2_HAS_COMPAT_FEATURE(j,mask) \
Dave Kleikamp470decc2006-10-11 01:20:57 -0700272 ((j)->j_format_version >= 2 && \
273 ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask))))
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700274#define JBD2_HAS_RO_COMPAT_FEATURE(j,mask) \
Dave Kleikamp470decc2006-10-11 01:20:57 -0700275 ((j)->j_format_version >= 2 && \
276 ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask))))
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700277#define JBD2_HAS_INCOMPAT_FEATURE(j,mask) \
Dave Kleikamp470decc2006-10-11 01:20:57 -0700278 ((j)->j_format_version >= 2 && \
279 ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask))))
280
Girish Shilamkar818d2762008-01-28 23:58:27 -0500281#define JBD2_FEATURE_COMPAT_CHECKSUM 0x00000001
282
283#define JBD2_FEATURE_INCOMPAT_REVOKE 0x00000001
284#define JBD2_FEATURE_INCOMPAT_64BIT 0x00000002
285#define JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT 0x00000004
Darrick J. Wong8f888ef2012-05-22 22:43:41 -0400286#define JBD2_FEATURE_INCOMPAT_CSUM_V2 0x00000008
Dave Kleikamp470decc2006-10-11 01:20:57 -0700287
288/* Features known to this kernel version: */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500289#define JBD2_KNOWN_COMPAT_FEATURES JBD2_FEATURE_COMPAT_CHECKSUM
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700290#define JBD2_KNOWN_ROCOMPAT_FEATURES 0
Zach Brownb517bea2006-10-11 01:21:08 -0700291#define JBD2_KNOWN_INCOMPAT_FEATURES (JBD2_FEATURE_INCOMPAT_REVOKE | \
Girish Shilamkar818d2762008-01-28 23:58:27 -0500292 JBD2_FEATURE_INCOMPAT_64BIT | \
Darrick J. Wonge93376c2012-05-27 08:12:42 -0400293 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | \
294 JBD2_FEATURE_INCOMPAT_CSUM_V2)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700295
296#ifdef __KERNEL__
297
298#include <linux/fs.h>
299#include <linux/sched.h>
Jan Karab34090e2013-06-04 12:08:56 -0400300
301enum jbd_state_bits {
302 BH_JBD /* Has an attached ext3 journal_head */
303 = BH_PrivateStart,
304 BH_JWrite, /* Being written to log (@@@ DEBUGGING) */
305 BH_Freed, /* Has been freed (truncated) */
306 BH_Revoked, /* Has been revoked from the log */
307 BH_RevokeValid, /* Revoked flag is valid */
308 BH_JBDDirty, /* Is dirty but journaled */
309 BH_State, /* Pins most journal_head state */
310 BH_JournalHead, /* Pins bh->b_private and jh->b_bh */
311 BH_Shadow, /* IO on shadow buffer is running */
312 BH_Verified, /* Metadata block has been verified ok */
313 BH_JBDPrivateStart, /* First bit available for private use by FS */
314};
315
316BUFFER_FNS(JBD, jbd)
317BUFFER_FNS(JWrite, jwrite)
318BUFFER_FNS(JBDDirty, jbddirty)
319TAS_BUFFER_FNS(JBDDirty, jbddirty)
320BUFFER_FNS(Revoked, revoked)
321TAS_BUFFER_FNS(Revoked, revoked)
322BUFFER_FNS(RevokeValid, revokevalid)
323TAS_BUFFER_FNS(RevokeValid, revokevalid)
324BUFFER_FNS(Freed, freed)
325BUFFER_FNS(Shadow, shadow)
326BUFFER_FNS(Verified, verified)
327
Thomas Gleixner44606672011-10-27 04:38:18 -0400328#include <linux/jbd_common.h>
Dave Kleikamp470decc2006-10-11 01:20:57 -0700329
Chris Snook36df53f2008-01-28 23:58:27 -0500330#define J_ASSERT(assert) BUG_ON(!(assert))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700331
Dave Kleikamp470decc2006-10-11 01:20:57 -0700332#define J_ASSERT_BH(bh, expr) J_ASSERT(expr)
333#define J_ASSERT_JH(jh, expr) J_ASSERT(expr)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700334
Mingming Caocd02ff02007-10-16 18:38:25 -0400335#if defined(JBD2_PARANOID_IOFAIL)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700336#define J_EXPECT(expr, why...) J_ASSERT(expr)
337#define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr)
338#define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr)
339#else
340#define __journal_expect(expr, why...) \
341 ({ \
342 int val = (expr); \
343 if (!val) { \
344 printk(KERN_ERR \
Theodore Ts'o08ec8c32009-01-16 11:57:00 -0500345 "JBD2 unexpected failure: %s: %s;\n", \
346 __func__, #expr); \
Dave Kleikamp470decc2006-10-11 01:20:57 -0700347 printk(KERN_ERR why "\n"); \
348 } \
349 val; \
350 })
351#define J_EXPECT(expr, why...) __journal_expect(expr, ## why)
352#define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why)
353#define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why)
354#endif
355
Jan Karac851ed52008-07-11 19:27:31 -0400356/* Flags in jbd_inode->i_flags */
357#define __JI_COMMIT_RUNNING 0
358/* Commit of the inode data in progress. We use this flag to protect us from
359 * concurrent deletion of inode. We cannot use reference to inode for this
360 * since we cannot afford doing last iput() on behalf of kjournald
361 */
362#define JI_COMMIT_RUNNING (1 << __JI_COMMIT_RUNNING)
363
364/**
365 * struct jbd_inode is the structure linking inodes in ordered mode
366 * present in a transaction so that we can sync them during commit.
367 */
368struct jbd2_inode {
369 /* Which transaction does this inode belong to? Either the running
370 * transaction or the committing one. [j_list_lock] */
371 transaction_t *i_transaction;
372
373 /* Pointer to the running transaction modifying inode's data in case
374 * there is already a committing transaction touching it. [j_list_lock] */
375 transaction_t *i_next_transaction;
376
377 /* List of inodes in the i_transaction [j_list_lock] */
378 struct list_head i_list;
379
380 /* VFS inode this inode belongs to [constant during the lifetime
381 * of the structure] */
382 struct inode *i_vfs_inode;
383
384 /* Flags of inode [j_list_lock] */
Brian King39e3ac22010-10-27 21:25:12 -0400385 unsigned long i_flags;
Jan Karac851ed52008-07-11 19:27:31 -0400386};
387
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700388struct jbd2_revoke_table_s;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700389
390/**
391 * struct handle_s - The handle_s type is the concrete type associated with
392 * handle_t.
393 * @h_transaction: Which compound transaction is this update a part of?
394 * @h_buffer_credits: Number of remaining buffers we are allowed to dirty.
395 * @h_ref: Reference count on this handle
396 * @h_err: Field for caller's use to track errors through large fs operations
397 * @h_sync: flag for sync-on-close
398 * @h_jdata: flag to force data journaling
399 * @h_aborted: flag indicating fatal error on handle
400 **/
401
402/* Docbook can't yet cope with the bit fields, but will leave the documentation
403 * in so it can be fixed later.
404 */
405
Theodore Ts'o8aefcd52011-01-10 12:29:43 -0500406struct jbd2_journal_handle
Dave Kleikamp470decc2006-10-11 01:20:57 -0700407{
Jan Kara8f7d89f2013-06-04 12:35:11 -0400408 union {
409 /* Which compound transaction is this update a part of? */
410 transaction_t *h_transaction;
411 /* Which journal handle belongs to - used iff h_reserved set */
412 journal_t *h_journal;
413 };
414
415 /* Handle reserved for finishing the logical operation */
416 handle_t *h_rsv_handle;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700417
418 /* Number of remaining buffers we are allowed to dirty: */
419 int h_buffer_credits;
420
421 /* Reference count on this handle */
422 int h_ref;
423
424 /* Field for caller's use to track errors through large fs */
425 /* operations */
426 int h_err;
427
428 /* Flags [no locking] */
Theodore Ts'o078d5032013-02-07 00:02:15 -0500429 unsigned int h_sync: 1; /* sync-on-close */
430 unsigned int h_jdata: 1; /* force data journaling */
Jan Kara8f7d89f2013-06-04 12:35:11 -0400431 unsigned int h_reserved: 1; /* handle with reserved credits */
Theodore Ts'o078d5032013-02-07 00:02:15 -0500432 unsigned int h_aborted: 1; /* fatal error on handle */
Theodore Ts'o343d9c22013-02-08 13:00:22 -0500433 unsigned int h_type: 8; /* for handle statistics */
434 unsigned int h_line_no: 16; /* for handle statistics */
435
436 unsigned long h_start_jiffies;
437 unsigned int h_requested_credits;
Mingming Cao7b751062008-01-28 23:58:27 -0500438
439#ifdef CONFIG_DEBUG_LOCK_ALLOC
440 struct lockdep_map h_lockdep_map;
441#endif
Dave Kleikamp470decc2006-10-11 01:20:57 -0700442};
443
444
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500445/*
446 * Some stats for checkpoint phase
447 */
448struct transaction_chp_stats_s {
449 unsigned long cs_chp_time;
Theodore Ts'obf699322009-09-30 00:32:06 -0400450 __u32 cs_forced_to_close;
451 __u32 cs_written;
452 __u32 cs_dropped;
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500453};
454
Dave Kleikamp470decc2006-10-11 01:20:57 -0700455/* The transaction_t type is the guts of the journaling mechanism. It
456 * tracks a compound transaction through its various states:
457 *
458 * RUNNING: accepting new updates
459 * LOCKED: Updates still running but we don't accept new ones
460 * RUNDOWN: Updates are tidying up but have finished requesting
461 * new buffers to modify (state not used for now)
462 * FLUSH: All updates complete, but we are still writing to disk
463 * COMMIT: All data on disk, writing commit record
464 * FINISHED: We still have to keep the transaction for checkpointing.
465 *
466 * The transaction keeps track of all of the buffers modified by a
467 * running transaction, and all of the buffers committed but not yet
468 * flushed to home for finished transactions.
469 */
470
471/*
472 * Lock ranking:
473 *
474 * j_list_lock
475 * ->jbd_lock_bh_journal_head() (This is "innermost")
476 *
477 * j_state_lock
478 * ->jbd_lock_bh_state()
479 *
480 * jbd_lock_bh_state()
481 * ->j_list_lock
482 *
483 * j_state_lock
484 * ->t_handle_lock
485 *
486 * j_state_lock
487 * ->j_list_lock (journal_unmap_buffer)
488 *
489 */
490
491struct transaction_s
492{
493 /* Pointer to the journal for this transaction. [no locking] */
494 journal_t *t_journal;
495
496 /* Sequence number for this transaction [no locking] */
497 tid_t t_tid;
498
499 /*
500 * Transaction's current state
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700501 * [no locking - only kjournald2 alters this]
Jan Karaf5a7a6b2008-01-28 23:58:27 -0500502 * [j_list_lock] guards transition of a transaction into T_FINISHED
503 * state and subsequent call of __jbd2_journal_drop_transaction()
Dave Kleikamp470decc2006-10-11 01:20:57 -0700504 * FIXME: needs barriers
505 * KLUDGE: [use j_state_lock]
506 */
507 enum {
508 T_RUNNING,
509 T_LOCKED,
Dave Kleikamp470decc2006-10-11 01:20:57 -0700510 T_FLUSH,
511 T_COMMIT,
Jan Karabbd2be32011-05-24 11:59:18 -0400512 T_COMMIT_DFLUSH,
513 T_COMMIT_JFLUSH,
Dmitry Monakhov794446c2013-04-03 22:06:52 -0400514 T_COMMIT_CALLBACK,
Dave Kleikamp470decc2006-10-11 01:20:57 -0700515 T_FINISHED
516 } t_state;
517
518 /*
519 * Where in the log does this transaction's commit start? [no locking]
520 */
521 unsigned long t_log_start;
522
523 /* Number of buffers on the t_buffers list [j_list_lock] */
524 int t_nr_buffers;
525
526 /*
527 * Doubly-linked circular list of all buffers reserved but not yet
528 * modified by this transaction [j_list_lock]
529 */
530 struct journal_head *t_reserved_list;
531
532 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700533 * Doubly-linked circular list of all metadata buffers owned by this
534 * transaction [j_list_lock]
535 */
536 struct journal_head *t_buffers;
537
538 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700539 * Doubly-linked circular list of all forget buffers (superseded
540 * buffers which we can un-checkpoint once this transaction commits)
541 * [j_list_lock]
542 */
543 struct journal_head *t_forget;
544
545 /*
546 * Doubly-linked circular list of all buffers still to be flushed before
547 * this transaction can be checkpointed. [j_list_lock]
548 */
549 struct journal_head *t_checkpoint_list;
550
551 /*
552 * Doubly-linked circular list of all buffers submitted for IO while
553 * checkpointing. [j_list_lock]
554 */
555 struct journal_head *t_checkpoint_io_list;
556
557 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700558 * Doubly-linked circular list of metadata buffers being shadowed by log
559 * IO. The IO buffers on the iobuf list and the shadow buffers on this
560 * list match each other one for one at all times. [j_list_lock]
561 */
562 struct journal_head *t_shadow_list;
563
564 /*
Jan Karac851ed52008-07-11 19:27:31 -0400565 * List of inodes whose data we've modified in data=ordered mode.
566 * [j_list_lock]
567 */
568 struct list_head t_inode_list;
569
570 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700571 * Protects info related to handles
572 */
573 spinlock_t t_handle_lock;
574
575 /*
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500576 * Longest time some handle had to wait for running transaction
577 */
578 unsigned long t_max_wait;
579
580 /*
581 * When transaction started
582 */
583 unsigned long t_start;
584
585 /*
Theodore Ts'o9fff24a2013-02-06 22:30:23 -0500586 * When commit was requested
587 */
588 unsigned long t_requested;
589
590 /*
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500591 * Checkpointing stats [j_checkpoint_sem]
592 */
593 struct transaction_chp_stats_s t_chp_stats;
594
595 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700596 * Number of outstanding updates running on this transaction
597 * [t_handle_lock]
598 */
Theodore Ts'oa51dca92010-08-02 08:43:25 -0400599 atomic_t t_updates;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700600
601 /*
602 * Number of buffers reserved for use by all handles in this transaction
603 * handle but not yet modified. [t_handle_lock]
604 */
Theodore Ts'oa51dca92010-08-02 08:43:25 -0400605 atomic_t t_outstanding_credits;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700606
607 /*
608 * Forward and backward links for the circular list of all transactions
609 * awaiting checkpoint. [j_list_lock]
610 */
611 transaction_t *t_cpnext, *t_cpprev;
612
613 /*
614 * When will the transaction expire (become due for commit), in jiffies?
615 * [no locking]
616 */
617 unsigned long t_expires;
618
619 /*
Josef Bacike07f7182008-11-26 01:14:26 -0500620 * When this transaction started, in nanoseconds [no locking]
621 */
622 ktime_t t_start_time;
623
624 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700625 * How many handles used this transaction? [t_handle_lock]
626 */
Theodore Ts'o8dd42042010-08-03 21:38:29 -0400627 atomic_t t_handle_count;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700628
Theodore Ts'o3e624fc2008-10-16 20:00:24 -0400629 /*
Theodore Ts'o70585482009-03-25 23:35:46 -0400630 * This transaction is being forced and some process is
631 * waiting for it to finish.
632 */
H Hartley Sweeten0ccff1a2009-08-17 22:38:04 -0400633 unsigned int t_synchronous_commit:1;
Jan Kara81be12c2011-05-24 11:52:40 -0400634
635 /* Disk flush needs to be sent to fs partition [no locking] */
636 int t_need_data_flush;
Theodore Ts'o70585482009-03-25 23:35:46 -0400637
638 /*
Theodore Ts'o3e624fc2008-10-16 20:00:24 -0400639 * For use by the filesystem to store fs-specific data
640 * structures associated with the transaction
641 */
642 struct list_head t_private_list;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700643};
644
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500645struct transaction_run_stats_s {
646 unsigned long rs_wait;
Theodore Ts'o9fff24a2013-02-06 22:30:23 -0500647 unsigned long rs_request_delay;
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500648 unsigned long rs_running;
649 unsigned long rs_locked;
650 unsigned long rs_flushing;
651 unsigned long rs_logging;
652
Theodore Ts'obf699322009-09-30 00:32:06 -0400653 __u32 rs_handle_count;
654 __u32 rs_blocks;
655 __u32 rs_blocks_logged;
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500656};
657
658struct transaction_stats_s {
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500659 unsigned long ts_tid;
Theodore Ts'o9fff24a2013-02-06 22:30:23 -0500660 unsigned long ts_requested;
Theodore Ts'obf699322009-09-30 00:32:06 -0400661 struct transaction_run_stats_s run;
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500662};
663
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500664static inline unsigned long
665jbd2_time_diff(unsigned long start, unsigned long end)
666{
667 if (end >= start)
668 return end - start;
669
670 return end + (MAX_JIFFY_OFFSET - start);
671}
672
Theodore Ts'o1a0d3782008-11-05 00:09:22 -0500673#define JBD2_NR_BATCH 64
674
Dave Kleikamp470decc2006-10-11 01:20:57 -0700675/**
676 * struct journal_s - The journal_s type is the concrete type associated with
677 * journal_t.
678 * @j_flags: General journaling state flags
679 * @j_errno: Is there an outstanding uncleared error on the journal (from a
680 * prior abort)?
681 * @j_sb_buffer: First part of superblock buffer
682 * @j_superblock: Second part of superblock buffer
683 * @j_format_version: Version of the superblock format
684 * @j_state_lock: Protect the various scalars in the journal
685 * @j_barrier_count: Number of processes waiting to create a barrier lock
686 * @j_barrier: The barrier lock itself
687 * @j_running_transaction: The current running transaction..
688 * @j_committing_transaction: the transaction we are pushing to disk
689 * @j_checkpoint_transactions: a linked circular list of all transactions
690 * waiting for checkpointing
691 * @j_wait_transaction_locked: Wait queue for waiting for a locked transaction
692 * to start committing, or for a barrier lock to be released
Dave Kleikamp470decc2006-10-11 01:20:57 -0700693 * @j_wait_done_commit: Wait queue for waiting for commit to complete
Dave Kleikamp470decc2006-10-11 01:20:57 -0700694 * @j_wait_commit: Wait queue to trigger commit
695 * @j_wait_updates: Wait queue to wait for updates to complete
Jan Kara8f7d89f2013-06-04 12:35:11 -0400696 * @j_wait_reserved: Wait queue to wait for reserved buffer credits to drop
Dave Kleikamp470decc2006-10-11 01:20:57 -0700697 * @j_checkpoint_mutex: Mutex for locking against concurrent checkpoints
698 * @j_head: Journal head - identifies the first unused block in the journal
699 * @j_tail: Journal tail - identifies the oldest still-used block in the
700 * journal.
701 * @j_free: Journal free - how many free blocks are there in the journal?
702 * @j_first: The block number of the first usable block
703 * @j_last: The block number one beyond the last usable block
704 * @j_dev: Device where we store the journal
705 * @j_blocksize: blocksize for the location where we store the journal.
706 * @j_blk_offset: starting block offset for into the device where we store the
707 * journal
708 * @j_fs_dev: Device which holds the client fs. For internal journal this will
709 * be equal to j_dev
Jan Kara8f7d89f2013-06-04 12:35:11 -0400710 * @j_reserved_credits: Number of buffers reserved from the running transaction
Dave Kleikamp470decc2006-10-11 01:20:57 -0700711 * @j_maxlen: Total maximum capacity of the journal region on disk.
712 * @j_list_lock: Protects the buffer lists and internal buffer state.
713 * @j_inode: Optional inode where we store the journal. If present, all journal
714 * block numbers are mapped into this inode via bmap().
715 * @j_tail_sequence: Sequence number of the oldest transaction in the log
716 * @j_transaction_sequence: Sequence number of the next transaction to grant
717 * @j_commit_sequence: Sequence number of the most recently committed
718 * transaction
719 * @j_commit_request: Sequence number of the most recent transaction wanting
720 * commit
721 * @j_uuid: Uuid of client object.
722 * @j_task: Pointer to the current commit thread for this journal
723 * @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a
724 * single compound commit transaction
725 * @j_commit_interval: What is the maximum transaction lifetime before we begin
726 * a commit?
727 * @j_commit_timer: The timer used to wakeup the commit thread
728 * @j_revoke_lock: Protect the revoke table
729 * @j_revoke: The revoke table - maintains the list of revoked blocks in the
730 * current transaction.
731 * @j_revoke_table: alternate revoke tables for j_revoke
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700732 * @j_wbuf: array of buffer_heads for jbd2_journal_commit_transaction
Dave Kleikamp470decc2006-10-11 01:20:57 -0700733 * @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the
734 * number that will fit in j_blocksize
735 * @j_last_sync_writer: most recent pid which did a synchronous write
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500736 * @j_history: Buffer storing the transactions statistics history
737 * @j_history_max: Maximum number of transactions in the statistics history
738 * @j_history_cur: Current number of transactions in the statistics history
739 * @j_history_lock: Protect the transactions statistics history
740 * @j_proc_entry: procfs entry for the jbd statistics directory
741 * @j_stats: Overall statistics
Dave Kleikamp470decc2006-10-11 01:20:57 -0700742 * @j_private: An opaque pointer to fs-private information.
743 */
744
745struct journal_s
746{
747 /* General journaling state flags [j_state_lock] */
748 unsigned long j_flags;
749
750 /*
751 * Is there an outstanding uncleared error on the journal (from a prior
752 * abort)? [j_state_lock]
753 */
754 int j_errno;
755
756 /* The superblock buffer */
757 struct buffer_head *j_sb_buffer;
758 journal_superblock_t *j_superblock;
759
760 /* Version of the superblock format */
761 int j_format_version;
762
763 /*
764 * Protect the various scalars in the journal
765 */
Theodore Ts'oa931da62010-08-03 21:35:12 -0400766 rwlock_t j_state_lock;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700767
768 /*
769 * Number of processes waiting to create a barrier lock [j_state_lock]
770 */
771 int j_barrier_count;
772
773 /* The barrier lock itself */
774 struct mutex j_barrier;
775
776 /*
777 * Transactions: The current running transaction...
778 * [j_state_lock] [caller holding open handle]
779 */
780 transaction_t *j_running_transaction;
781
782 /*
783 * the transaction we are pushing to disk
784 * [j_state_lock] [caller holding open handle]
785 */
786 transaction_t *j_committing_transaction;
787
788 /*
789 * ... and a linked circular list of all transactions waiting for
790 * checkpointing. [j_list_lock]
791 */
792 transaction_t *j_checkpoint_transactions;
793
794 /*
795 * Wait queue for waiting for a locked transaction to start committing,
796 * or for a barrier lock to be released
797 */
798 wait_queue_head_t j_wait_transaction_locked;
799
Dave Kleikamp470decc2006-10-11 01:20:57 -0700800 /* Wait queue for waiting for commit to complete */
801 wait_queue_head_t j_wait_done_commit;
802
Dave Kleikamp470decc2006-10-11 01:20:57 -0700803 /* Wait queue to trigger commit */
804 wait_queue_head_t j_wait_commit;
805
806 /* Wait queue to wait for updates to complete */
807 wait_queue_head_t j_wait_updates;
808
Jan Kara8f7d89f2013-06-04 12:35:11 -0400809 /* Wait queue to wait for reserved buffer credits to drop */
810 wait_queue_head_t j_wait_reserved;
811
Dave Kleikamp470decc2006-10-11 01:20:57 -0700812 /* Semaphore for locking against concurrent checkpoints */
813 struct mutex j_checkpoint_mutex;
814
815 /*
Theodore Ts'o1a0d3782008-11-05 00:09:22 -0500816 * List of buffer heads used by the checkpoint routine. This
817 * was moved from jbd2_log_do_checkpoint() to reduce stack
818 * usage. Access to this array is controlled by the
819 * j_checkpoint_mutex. [j_checkpoint_mutex]
820 */
821 struct buffer_head *j_chkpt_bhs[JBD2_NR_BATCH];
822
823 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700824 * Journal head: identifies the first unused block in the journal.
825 * [j_state_lock]
826 */
827 unsigned long j_head;
828
829 /*
830 * Journal tail: identifies the oldest still-used block in the journal.
831 * [j_state_lock]
832 */
833 unsigned long j_tail;
834
835 /*
836 * Journal free: how many free blocks are there in the journal?
837 * [j_state_lock]
838 */
839 unsigned long j_free;
840
841 /*
842 * Journal start and end: the block numbers of the first usable block
843 * and one beyond the last usable block in the journal. [j_state_lock]
844 */
845 unsigned long j_first;
846 unsigned long j_last;
847
848 /*
849 * Device, blocksize and starting block offset for the location where we
850 * store the journal.
851 */
852 struct block_device *j_dev;
853 int j_blocksize;
Theodore Ts'o05496762008-09-16 14:36:17 -0400854 unsigned long long j_blk_offset;
855 char j_devname[BDEVNAME_SIZE+24];
Dave Kleikamp470decc2006-10-11 01:20:57 -0700856
857 /*
858 * Device which holds the client fs. For internal journal this will be
859 * equal to j_dev.
860 */
861 struct block_device *j_fs_dev;
862
863 /* Total maximum capacity of the journal region on disk. */
864 unsigned int j_maxlen;
865
Jan Kara8f7d89f2013-06-04 12:35:11 -0400866 /* Number of buffers reserved from the running transaction */
867 atomic_t j_reserved_credits;
868
Dave Kleikamp470decc2006-10-11 01:20:57 -0700869 /*
870 * Protects the buffer lists and internal buffer state.
871 */
872 spinlock_t j_list_lock;
873
874 /* Optional inode where we store the journal. If present, all */
875 /* journal block numbers are mapped into this inode via */
876 /* bmap(). */
877 struct inode *j_inode;
878
879 /*
880 * Sequence number of the oldest transaction in the log [j_state_lock]
881 */
882 tid_t j_tail_sequence;
883
884 /*
885 * Sequence number of the next transaction to grant [j_state_lock]
886 */
887 tid_t j_transaction_sequence;
888
889 /*
890 * Sequence number of the most recently committed transaction
891 * [j_state_lock].
892 */
893 tid_t j_commit_sequence;
894
895 /*
896 * Sequence number of the most recent transaction wanting commit
897 * [j_state_lock]
898 */
899 tid_t j_commit_request;
900
901 /*
902 * Journal uuid: identifies the object (filesystem, LVM volume etc)
903 * backed by this journal. This will eventually be replaced by an array
904 * of uuids, allowing us to index multiple devices within a single
905 * journal and to perform atomic updates across them.
906 */
907 __u8 j_uuid[16];
908
909 /* Pointer to the current commit thread for this journal */
910 struct task_struct *j_task;
911
912 /*
913 * Maximum number of metadata buffers to allow in a single compound
914 * commit transaction
915 */
916 int j_max_transaction_buffers;
917
918 /*
919 * What is the maximum transaction lifetime before we begin a commit?
920 */
921 unsigned long j_commit_interval;
922
923 /* The timer used to wakeup the commit thread: */
924 struct timer_list j_commit_timer;
925
926 /*
927 * The revoke table: maintains the list of revoked blocks in the
928 * current transaction. [j_revoke_lock]
929 */
930 spinlock_t j_revoke_lock;
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700931 struct jbd2_revoke_table_s *j_revoke;
932 struct jbd2_revoke_table_s *j_revoke_table[2];
Dave Kleikamp470decc2006-10-11 01:20:57 -0700933
934 /*
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700935 * array of bhs for jbd2_journal_commit_transaction
Dave Kleikamp470decc2006-10-11 01:20:57 -0700936 */
937 struct buffer_head **j_wbuf;
938 int j_wbufsize;
939
Josef Bacike07f7182008-11-26 01:14:26 -0500940 /*
941 * this is the pid of hte last person to run a synchronous operation
942 * through the journal
943 */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700944 pid_t j_last_sync_writer;
945
Josef Bacike07f7182008-11-26 01:14:26 -0500946 /*
947 * the average amount of time in nanoseconds it takes to commit a
948 * transaction to disk. [j_state_lock]
949 */
950 u64 j_average_commit_time;
951
Theodore Ts'o30773842009-01-03 20:27:38 -0500952 /*
953 * minimum and maximum times that we should wait for
954 * additional filesystem operations to get batched into a
955 * synchronous handle in microseconds
956 */
957 u32 j_min_batch_time;
958 u32 j_max_batch_time;
959
Theodore Ts'o3e624fc2008-10-16 20:00:24 -0400960 /* This function is called when a transaction is closed */
961 void (*j_commit_callback)(journal_t *,
962 transaction_t *);
963
Dave Kleikamp470decc2006-10-11 01:20:57 -0700964 /*
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500965 * Journal statistics
966 */
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500967 spinlock_t j_history_lock;
968 struct proc_dir_entry *j_proc_entry;
969 struct transaction_stats_s j_stats;
970
Theodore Ts'o624080e2008-06-06 17:50:40 -0400971 /* Failed journal commit ID */
972 unsigned int j_failed_commit;
973
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500974 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700975 * An opaque pointer to fs-private information. ext3 puts its
976 * superblock pointer here
977 */
978 void *j_private;
Darrick J. Wong01b5adc2012-05-27 07:50:56 -0400979
980 /* Reference to checksum algorithm driver via cryptoapi */
981 struct crypto_shash *j_chksum_driver;
Darrick J. Wong4fd5ea42012-05-27 08:08:22 -0400982
983 /* Precomputed journal UUID checksum for seeding other checksums */
984 __u32 j_csum_seed;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700985};
986
987/*
988 * Journal flag definitions
989 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700990#define JBD2_UNMOUNT 0x001 /* Journal thread is being destroyed */
991#define JBD2_ABORT 0x002 /* Journaling has been aborted for errors. */
992#define JBD2_ACK_ERR 0x004 /* The errno in the sb has been acked */
993#define JBD2_FLUSHED 0x008 /* The journal superblock has been flushed */
994#define JBD2_LOADED 0x010 /* The journal superblock has been loaded */
995#define JBD2_BARRIER 0x020 /* Use IDE barriers */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400996#define JBD2_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file
997 * data write error in ordered
998 * mode */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700999
1000/*
1001 * Function declarations for the journaling transaction and buffer
1002 * management
1003 */
1004
1005/* Filing buffers */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001006extern void jbd2_journal_unfile_buffer(journal_t *, struct journal_head *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001007extern void __jbd2_journal_refile_buffer(struct journal_head *);
1008extern void jbd2_journal_refile_buffer(journal_t *, struct journal_head *);
1009extern void __jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001010extern void __journal_free_buffer(struct journal_head *bh);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001011extern void jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001012extern void __journal_clean_data_list(transaction_t *transaction);
Jan Karaf5113ef2013-06-04 12:01:45 -04001013static inline void jbd2_file_log_bh(struct list_head *head, struct buffer_head *bh)
1014{
1015 list_add_tail(&bh->b_assoc_buffers, head);
1016}
1017static inline void jbd2_unfile_log_bh(struct buffer_head *bh)
1018{
1019 list_del_init(&bh->b_assoc_buffers);
1020}
Dave Kleikamp470decc2006-10-11 01:20:57 -07001021
1022/* Log buffer allocation */
Jan Karae5a120a2013-06-04 12:06:01 -04001023struct buffer_head *jbd2_journal_get_descriptor_buffer(journal_t *journal);
Mingming Cao18eba7a2006-10-11 01:21:13 -07001024int jbd2_journal_next_log_block(journal_t *, unsigned long long *);
Jan Kara79feb522012-03-13 22:22:54 -04001025int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid,
1026 unsigned long *block);
1027void __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block);
Jan Kara33395782012-03-13 22:45:38 -04001028void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001029
1030/* Commit management */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001031extern void jbd2_journal_commit_transaction(journal_t *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001032
1033/* Checkpoint list management */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001034int __jbd2_journal_clean_checkpoint_list(journal_t *journal);
1035int __jbd2_journal_remove_checkpoint(struct journal_head *);
1036void __jbd2_journal_insert_checkpoint(struct journal_head *, transaction_t *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001037
Joel Beckere06c8222008-09-11 15:35:47 -07001038
1039/*
1040 * Triggers
1041 */
1042
1043struct jbd2_buffer_trigger_type {
1044 /*
Jan Kara13ceef02010-07-14 07:56:33 +02001045 * Fired a the moment data to write to the journal are known to be
1046 * stable - so either at the moment b_frozen_data is created or just
1047 * before a buffer is written to the journal. mapped_data is a mapped
1048 * buffer that is the frozen data for commit.
Joel Beckere06c8222008-09-11 15:35:47 -07001049 */
Jan Kara13ceef02010-07-14 07:56:33 +02001050 void (*t_frozen)(struct jbd2_buffer_trigger_type *type,
Joel Beckere06c8222008-09-11 15:35:47 -07001051 struct buffer_head *bh, void *mapped_data,
1052 size_t size);
1053
1054 /*
1055 * Fired during journal abort for dirty buffers that will not be
1056 * committed.
1057 */
1058 void (*t_abort)(struct jbd2_buffer_trigger_type *type,
1059 struct buffer_head *bh);
1060};
1061
Jan Kara13ceef02010-07-14 07:56:33 +02001062extern void jbd2_buffer_frozen_trigger(struct journal_head *jh,
Joel Beckere06c8222008-09-11 15:35:47 -07001063 void *mapped_data,
1064 struct jbd2_buffer_trigger_type *triggers);
1065extern void jbd2_buffer_abort_trigger(struct journal_head *jh,
1066 struct jbd2_buffer_trigger_type *triggers);
1067
Dave Kleikamp470decc2006-10-11 01:20:57 -07001068/* Buffer IO */
Jan Karaf5113ef2013-06-04 12:01:45 -04001069extern int jbd2_journal_write_metadata_buffer(transaction_t *transaction,
1070 struct journal_head *jh_in,
1071 struct buffer_head **bh_out,
1072 sector_t blocknr);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001073
1074/* Transaction locking */
1075extern void __wait_on_journal (journal_t *);
1076
Yongqiang Yang0c2022e2012-02-20 17:53:02 -05001077/* Transaction cache support */
1078extern void jbd2_journal_destroy_transaction_cache(void);
1079extern int jbd2_journal_init_transaction_cache(void);
1080extern void jbd2_journal_free_transaction(transaction_t *);
1081
Dave Kleikamp470decc2006-10-11 01:20:57 -07001082/*
1083 * Journal locking.
1084 *
1085 * We need to lock the journal during transaction state changes so that nobody
1086 * ever tries to take a handle on the running transaction while we are in the
1087 * middle of moving it to the commit phase. j_state_lock does this.
1088 *
1089 * Note that the locking is completely interrupt unsafe. We never touch
1090 * journal structures from interrupts.
1091 */
1092
1093static inline handle_t *journal_current_handle(void)
1094{
1095 return current->journal_info;
1096}
1097
1098/* The journaling code user interface:
1099 *
1100 * Create and destroy handles
1101 * Register buffer modifications against the current transaction.
1102 */
1103
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001104extern handle_t *jbd2_journal_start(journal_t *, int nblocks);
Jan Kara8f7d89f2013-06-04 12:35:11 -04001105extern handle_t *jbd2__journal_start(journal_t *, int blocks, int rsv_blocks,
1106 gfp_t gfp_mask, unsigned int type,
1107 unsigned int line_no);
Theodore Ts'o47def822010-07-27 11:56:05 -04001108extern int jbd2_journal_restart(handle_t *, int nblocks);
Dan Carpenterd2159fb2011-09-04 10:20:14 -04001109extern int jbd2__journal_restart(handle_t *, int nblocks, gfp_t gfp_mask);
Jan Kara8f7d89f2013-06-04 12:35:11 -04001110extern int jbd2_journal_start_reserved(handle_t *handle,
1111 unsigned int type, unsigned int line_no);
1112extern void jbd2_journal_free_reserved(handle_t *handle);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001113extern int jbd2_journal_extend (handle_t *, int nblocks);
1114extern int jbd2_journal_get_write_access(handle_t *, struct buffer_head *);
1115extern int jbd2_journal_get_create_access (handle_t *, struct buffer_head *);
1116extern int jbd2_journal_get_undo_access(handle_t *, struct buffer_head *);
Joel Beckere06c8222008-09-11 15:35:47 -07001117void jbd2_journal_set_triggers(struct buffer_head *,
1118 struct jbd2_buffer_trigger_type *type);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001119extern int jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001120extern int jbd2_journal_forget (handle_t *, struct buffer_head *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001121extern void journal_sync_buffer (struct buffer_head *);
Jan Kara53e87262012-12-25 13:29:52 -05001122extern int jbd2_journal_invalidatepage(journal_t *,
Lukas Czerner259709b2013-05-21 23:20:03 -04001123 struct page *, unsigned int, unsigned int);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001124extern int jbd2_journal_try_to_free_buffers(journal_t *, struct page *, gfp_t);
1125extern int jbd2_journal_stop(handle_t *);
1126extern int jbd2_journal_flush (journal_t *);
1127extern void jbd2_journal_lock_updates (journal_t *);
1128extern void jbd2_journal_unlock_updates (journal_t *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001129
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001130extern journal_t * jbd2_journal_init_dev(struct block_device *bdev,
Dave Kleikamp470decc2006-10-11 01:20:57 -07001131 struct block_device *fs_dev,
Mingming Cao18eba7a2006-10-11 01:21:13 -07001132 unsigned long long start, int len, int bsize);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001133extern journal_t * jbd2_journal_init_inode (struct inode *);
1134extern int jbd2_journal_update_format (journal_t *);
1135extern int jbd2_journal_check_used_features
Dave Kleikamp470decc2006-10-11 01:20:57 -07001136 (journal_t *, unsigned long, unsigned long, unsigned long);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001137extern int jbd2_journal_check_available_features
Dave Kleikamp470decc2006-10-11 01:20:57 -07001138 (journal_t *, unsigned long, unsigned long, unsigned long);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001139extern int jbd2_journal_set_features
Dave Kleikamp470decc2006-10-11 01:20:57 -07001140 (journal_t *, unsigned long, unsigned long, unsigned long);
Girish Shilamkar818d2762008-01-28 23:58:27 -05001141extern void jbd2_journal_clear_features
1142 (journal_t *, unsigned long, unsigned long, unsigned long);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001143extern int jbd2_journal_load (journal_t *journal);
Hidehiro Kawai44519fa2008-10-10 20:29:13 -04001144extern int jbd2_journal_destroy (journal_t *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001145extern int jbd2_journal_recover (journal_t *journal);
1146extern int jbd2_journal_wipe (journal_t *, int);
1147extern int jbd2_journal_skip_recovery (journal_t *);
Theodore Ts'od796c522012-08-05 19:04:57 -04001148extern void jbd2_journal_update_sb_errno(journal_t *);
Jan Kara79feb522012-03-13 22:22:54 -04001149extern void jbd2_journal_update_sb_log_tail (journal_t *, tid_t,
1150 unsigned long, int);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001151extern void __jbd2_journal_abort_hard (journal_t *);
1152extern void jbd2_journal_abort (journal_t *, int);
1153extern int jbd2_journal_errno (journal_t *);
1154extern void jbd2_journal_ack_err (journal_t *);
1155extern int jbd2_journal_clear_err (journal_t *);
Mingming Cao18eba7a2006-10-11 01:21:13 -07001156extern int jbd2_journal_bmap(journal_t *, unsigned long, unsigned long long *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001157extern int jbd2_journal_force_commit(journal_t *);
Dmitry Monakhov9ff86442013-06-12 22:24:07 -04001158extern int jbd2_journal_force_commit_nested(journal_t *);
Jan Karac851ed52008-07-11 19:27:31 -04001159extern int jbd2_journal_file_inode(handle_t *handle, struct jbd2_inode *inode);
Jan Kara7f5aa212009-02-10 11:15:34 -05001160extern int jbd2_journal_begin_ordered_truncate(journal_t *journal,
1161 struct jbd2_inode *inode, loff_t new_size);
Jan Karac851ed52008-07-11 19:27:31 -04001162extern void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode);
1163extern void jbd2_journal_release_jbd_inode(journal_t *journal, struct jbd2_inode *jinode);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001164
1165/*
1166 * journal_head management
1167 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001168struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh);
1169struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001170void jbd2_journal_put_journal_head(struct journal_head *jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001171
1172/*
1173 * handle management
1174 */
Christoph Lametere18b8902006-12-06 20:33:20 -08001175extern struct kmem_cache *jbd2_handle_cache;
Dave Kleikamp470decc2006-10-11 01:20:57 -07001176
Mingming Caoaf1e76d2007-10-16 18:38:25 -04001177static inline handle_t *jbd2_alloc_handle(gfp_t gfp_flags)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001178{
Zheng Liu28daf4f2013-04-19 17:49:23 -04001179 return kmem_cache_zalloc(jbd2_handle_cache, gfp_flags);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001180}
1181
Mingming Caoaf1e76d2007-10-16 18:38:25 -04001182static inline void jbd2_free_handle(handle_t *handle)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001183{
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001184 kmem_cache_free(jbd2_handle_cache, handle);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001185}
1186
Theodore Ts'o8aefcd52011-01-10 12:29:43 -05001187/*
1188 * jbd2_inode management (optional, for those file systems that want to use
1189 * dynamically allocated jbd2_inode structures)
1190 */
1191extern struct kmem_cache *jbd2_inode_cache;
1192
1193static inline struct jbd2_inode *jbd2_alloc_inode(gfp_t gfp_flags)
1194{
1195 return kmem_cache_alloc(jbd2_inode_cache, gfp_flags);
1196}
1197
1198static inline void jbd2_free_inode(struct jbd2_inode *jinode)
1199{
1200 kmem_cache_free(jbd2_inode_cache, jinode);
1201}
1202
Dave Kleikamp470decc2006-10-11 01:20:57 -07001203/* Primary revoke support */
1204#define JOURNAL_REVOKE_DEFAULT_HASH 256
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001205extern int jbd2_journal_init_revoke(journal_t *, int);
1206extern void jbd2_journal_destroy_revoke_caches(void);
1207extern int jbd2_journal_init_revoke_caches(void);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001208
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001209extern void jbd2_journal_destroy_revoke(journal_t *);
Mingming Cao18eba7a2006-10-11 01:21:13 -07001210extern int jbd2_journal_revoke (handle_t *, unsigned long long, struct buffer_head *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001211extern int jbd2_journal_cancel_revoke(handle_t *, struct journal_head *);
Jan Karae5a120a2013-06-04 12:06:01 -04001212extern void jbd2_journal_write_revoke_records(journal_t *journal,
1213 transaction_t *transaction,
1214 struct list_head *log_bufs,
1215 int write_op);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001216
1217/* Recovery revoke support */
Mingming Cao18eba7a2006-10-11 01:21:13 -07001218extern int jbd2_journal_set_revoke(journal_t *, unsigned long long, tid_t);
1219extern int jbd2_journal_test_revoke(journal_t *, unsigned long long, tid_t);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001220extern void jbd2_journal_clear_revoke(journal_t *);
1221extern void jbd2_journal_switch_revoke_table(journal_t *journal);
Yongqiang Yang1ba37262011-12-28 17:46:46 -05001222extern void jbd2_clear_buffer_revoked_flags(journal_t *journal);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001223
1224/*
1225 * The log thread user interface:
1226 *
1227 * Request space in the current transaction, and force transaction commit
1228 * transitions on demand.
1229 */
1230
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001231int jbd2_log_start_commit(journal_t *journal, tid_t tid);
1232int __jbd2_log_start_commit(journal_t *journal, tid_t tid);
1233int jbd2_journal_start_commit(journal_t *journal, tid_t *tid);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001234int jbd2_log_wait_commit(journal_t *journal, tid_t tid);
Theodore Ts'od76a3a772013-04-03 22:02:52 -04001235int jbd2_complete_transaction(journal_t *journal, tid_t tid);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001236int jbd2_log_do_checkpoint(journal_t *journal);
Jan Karabbd2be32011-05-24 11:59:18 -04001237int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001238
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001239void __jbd2_log_wait_for_space(journal_t *journal);
Aneesh Kumar K.Vfb684072008-11-06 17:50:21 -05001240extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *);
1241extern int jbd2_cleanup_journal_tail(journal_t *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001242
1243/* Debugging code only: */
1244
1245#define jbd_ENOSYS() \
1246do { \
Harvey Harrisond5c003b2008-10-15 22:01:24 -07001247 printk (KERN_ERR "JBD unimplemented function %s\n", __func__); \
Dave Kleikamp470decc2006-10-11 01:20:57 -07001248 current->state = TASK_UNINTERRUPTIBLE; \
1249 schedule(); \
1250} while (1)
1251
1252/*
1253 * is_journal_abort
1254 *
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001255 * Simple test wrapper function to test the JBD2_ABORT state flag. This
Dave Kleikamp470decc2006-10-11 01:20:57 -07001256 * bit, when set, indicates that we have had a fatal error somewhere,
1257 * either inside the journaling layer or indicated to us by the client
1258 * (eg. ext3), and that we and should not commit any further
1259 * transactions.
1260 */
1261
1262static inline int is_journal_aborted(journal_t *journal)
1263{
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001264 return journal->j_flags & JBD2_ABORT;
Dave Kleikamp470decc2006-10-11 01:20:57 -07001265}
1266
1267static inline int is_handle_aborted(handle_t *handle)
1268{
Theodore Ts'o41a5b912013-07-01 08:12:41 -04001269 if (handle->h_aborted || !handle->h_transaction)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001270 return 1;
1271 return is_journal_aborted(handle->h_transaction->t_journal);
1272}
1273
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001274static inline void jbd2_journal_abort_handle(handle_t *handle)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001275{
1276 handle->h_aborted = 1;
1277}
1278
1279#endif /* __KERNEL__ */
1280
1281/* Comparison functions for transaction IDs: perform comparisons using
1282 * modulo arithmetic so that they work over sequence number wraps. */
1283
1284static inline int tid_gt(tid_t x, tid_t y)
1285{
1286 int difference = (x - y);
1287 return (difference > 0);
1288}
1289
1290static inline int tid_geq(tid_t x, tid_t y)
1291{
1292 int difference = (x - y);
1293 return (difference >= 0);
1294}
1295
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001296extern int jbd2_journal_blocks_per_page(struct inode *inode);
Zach Brownb517bea2006-10-11 01:21:08 -07001297extern size_t journal_tag_bytes(journal_t *journal);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001298
1299/*
Jan Kara76c39902013-06-04 12:12:57 -04001300 * We reserve t_outstanding_credits >> JBD2_CONTROL_BLOCKS_SHIFT for
1301 * transaction control blocks.
1302 */
1303#define JBD2_CONTROL_BLOCKS_SHIFT 5
1304
1305/*
Dave Kleikamp470decc2006-10-11 01:20:57 -07001306 * Return the minimum number of blocks which must be free in the journal
1307 * before a new transaction may be started. Must be called under j_state_lock.
1308 */
Jan Kara76c39902013-06-04 12:12:57 -04001309static inline int jbd2_space_needed(journal_t *journal)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001310{
1311 int nblocks = journal->j_max_transaction_buffers;
Jan Kara76c39902013-06-04 12:12:57 -04001312 return nblocks + (nblocks >> JBD2_CONTROL_BLOCKS_SHIFT);
1313}
1314
1315/*
1316 * Return number of free blocks in the log. Must be called under j_state_lock.
1317 */
1318static inline unsigned long jbd2_log_space_left(journal_t *journal)
1319{
1320 /* Allow for rounding errors */
1321 unsigned long free = journal->j_free - 32;
1322
1323 if (journal->j_committing_transaction) {
1324 unsigned long committing = atomic_read(&journal->
1325 j_committing_transaction->t_outstanding_credits);
1326
1327 /* Transaction + control blocks */
1328 free -= committing + (committing >> JBD2_CONTROL_BLOCKS_SHIFT);
1329 }
1330 return free;
Dave Kleikamp470decc2006-10-11 01:20:57 -07001331}
1332
1333/*
1334 * Definitions which augment the buffer_head layer
1335 */
1336
1337/* journaling buffer types */
1338#define BJ_None 0 /* Not journaled */
Jan Kara87c89c22008-07-11 19:27:31 -04001339#define BJ_Metadata 1 /* Normal journaled metadata */
1340#define BJ_Forget 2 /* Buffer superseded by this transaction */
Jan Karaf5113ef2013-06-04 12:01:45 -04001341#define BJ_Shadow 3 /* Buffer contents being shadowed to the log */
Jan Karae5a120a2013-06-04 12:06:01 -04001342#define BJ_Reserved 4 /* Buffer is reserved for access by journal */
1343#define BJ_Types 5
Dave Kleikamp470decc2006-10-11 01:20:57 -07001344
1345extern int jbd_blocks_per_page(struct inode *inode);
1346
Behan Websterfd47d3e2012-11-08 11:24:46 -05001347/* JBD uses a CRC32 checksum */
1348#define JBD_MAX_CHECKSUM_SIZE 4
1349
Darrick J. Wong01b5adc2012-05-27 07:50:56 -04001350static inline u32 jbd2_chksum(journal_t *journal, u32 crc,
1351 const void *address, unsigned int length)
1352{
1353 struct {
1354 struct shash_desc shash;
Behan Websterfd47d3e2012-11-08 11:24:46 -05001355 char ctx[JBD_MAX_CHECKSUM_SIZE];
Darrick J. Wong01b5adc2012-05-27 07:50:56 -04001356 } desc;
1357 int err;
1358
Behan Websterfd47d3e2012-11-08 11:24:46 -05001359 BUG_ON(crypto_shash_descsize(journal->j_chksum_driver) >
1360 JBD_MAX_CHECKSUM_SIZE);
1361
Darrick J. Wong01b5adc2012-05-27 07:50:56 -04001362 desc.shash.tfm = journal->j_chksum_driver;
1363 desc.shash.flags = 0;
1364 *(u32 *)desc.ctx = crc;
1365
1366 err = crypto_shash_update(&desc.shash, address, length);
1367 BUG_ON(err);
1368
1369 return *(u32 *)desc.ctx;
1370}
1371
Dmitry Monakhov06a407f2013-06-12 22:25:07 -04001372/* Return most recent uncommitted transaction */
1373static inline tid_t jbd2_get_latest_transaction(journal_t *journal)
1374{
1375 tid_t tid;
1376
1377 read_lock(&journal->j_state_lock);
1378 tid = journal->j_commit_request;
1379 if (journal->j_running_transaction)
1380 tid = journal->j_running_transaction->t_tid;
1381 read_unlock(&journal->j_state_lock);
1382 return tid;
1383}
1384
Dave Kleikamp470decc2006-10-11 01:20:57 -07001385#ifdef __KERNEL__
1386
1387#define buffer_trace_init(bh) do {} while (0)
1388#define print_buffer_fields(bh) do {} while (0)
1389#define print_buffer_trace(bh) do {} while (0)
1390#define BUFFER_TRACE(bh, info) do {} while (0)
1391#define BUFFER_TRACE2(bh, bh2, info) do {} while (0)
1392#define JBUFFER_TRACE(jh, info) do {} while (0)
1393
1394#endif /* __KERNEL__ */
1395
Mingming Caocd02ff02007-10-16 18:38:25 -04001396#endif /* _LINUX_JBD2_H */