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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 *
Darrick J. Wongdb9ee222014-08-27 18:40:07 -0400162 * If FEATURE_INCOMPAT_CSUM_V3 is set, the descriptor block uses
163 * journal_block_tag3_t to store a full 32-bit checksum. Everything else
164 * is the same as v2.
165 *
166 * Checksum v1, v2, and v3 are mutually exclusive features.
Girish Shilamkar818d2762008-01-28 23:58:27 -0500167 */
168struct commit_header {
169 __be32 h_magic;
170 __be32 h_blocktype;
171 __be32 h_sequence;
172 unsigned char h_chksum_type;
173 unsigned char h_chksum_size;
174 unsigned char h_padding[2];
175 __be32 h_chksum[JBD2_CHECKSUM_BYTES];
Theodore Ts'o736603a2008-07-11 19:27:31 -0400176 __be64 h_commit_sec;
177 __be32 h_commit_nsec;
Girish Shilamkar818d2762008-01-28 23:58:27 -0500178};
Dave Kleikamp470decc2006-10-11 01:20:57 -0700179
180/*
Zach Brownb517bea2006-10-11 01:21:08 -0700181 * The block tag: used to describe a single buffer in the journal.
182 * t_blocknr_high is only used if INCOMPAT_64BIT is set, so this
183 * raw struct shouldn't be used for pointer math or sizeof() - use
184 * journal_tag_bytes(journal) instead to compute this.
Dave Kleikamp470decc2006-10-11 01:20:57 -0700185 */
Darrick J. Wongdb9ee222014-08-27 18:40:07 -0400186typedef struct journal_block_tag3_s
187{
188 __be32 t_blocknr; /* The on-disk block number */
189 __be32 t_flags; /* See below */
190 __be32 t_blocknr_high; /* most-significant high 32bits. */
191 __be32 t_checksum; /* crc32c(uuid+seq+block) */
192} journal_block_tag3_t;
193
Dave Kleikamp470decc2006-10-11 01:20:57 -0700194typedef struct journal_block_tag_s
195{
196 __be32 t_blocknr; /* The on-disk block number */
Darrick J. Wong8f888ef2012-05-22 22:43:41 -0400197 __be16 t_checksum; /* truncated crc32c(uuid+seq+block) */
198 __be16 t_flags; /* See below */
Zach Brownb517bea2006-10-11 01:21:08 -0700199 __be32 t_blocknr_high; /* most-significant high 32bits. */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700200} journal_block_tag_t;
201
Darrick J. Wong8f888ef2012-05-22 22:43:41 -0400202/* Tail of descriptor block, for checksumming */
203struct jbd2_journal_block_tail {
204 __be32 t_checksum; /* crc32c(uuid+descr_block) */
205};
206
Dave Kleikamp470decc2006-10-11 01:20:57 -0700207/*
208 * The revoke descriptor: used on disk to describe a series of blocks to
209 * be revoked from the log
210 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700211typedef struct jbd2_journal_revoke_header_s
Dave Kleikamp470decc2006-10-11 01:20:57 -0700212{
213 journal_header_t r_header;
214 __be32 r_count; /* Count of bytes used in the block */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700215} jbd2_journal_revoke_header_t;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700216
Darrick J. Wong8f888ef2012-05-22 22:43:41 -0400217/* Tail of revoke block, for checksumming */
218struct jbd2_journal_revoke_tail {
219 __be32 r_checksum; /* crc32c(uuid+revoke_block) */
220};
Dave Kleikamp470decc2006-10-11 01:20:57 -0700221
222/* Definitions for the journal tag flags word: */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700223#define JBD2_FLAG_ESCAPE 1 /* on-disk block is escaped */
224#define JBD2_FLAG_SAME_UUID 2 /* block has same uuid as previous */
225#define JBD2_FLAG_DELETED 4 /* block deleted by this transaction */
226#define JBD2_FLAG_LAST_TAG 8 /* last tag in this descriptor block */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700227
228
229/*
230 * The journal superblock. All fields are in big-endian byte order.
231 */
232typedef struct journal_superblock_s
233{
234/* 0x0000 */
235 journal_header_t s_header;
236
237/* 0x000C */
238 /* Static information describing the journal */
239 __be32 s_blocksize; /* journal device blocksize */
240 __be32 s_maxlen; /* total blocks in journal file */
241 __be32 s_first; /* first block of log information */
242
243/* 0x0018 */
244 /* Dynamic information describing the current state of the log */
245 __be32 s_sequence; /* first commit ID expected in log */
246 __be32 s_start; /* blocknr of start of log */
247
248/* 0x0020 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700249 /* Error value, as set by jbd2_journal_abort(). */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700250 __be32 s_errno;
251
252/* 0x0024 */
253 /* Remaining fields are only valid in a version-2 superblock */
254 __be32 s_feature_compat; /* compatible feature set */
255 __be32 s_feature_incompat; /* incompatible feature set */
256 __be32 s_feature_ro_compat; /* readonly-compatible feature set */
257/* 0x0030 */
258 __u8 s_uuid[16]; /* 128-bit uuid for journal */
259
260/* 0x0040 */
261 __be32 s_nr_users; /* Nr of filesystems sharing log */
262
263 __be32 s_dynsuper; /* Blocknr of dynamic superblock copy*/
264
265/* 0x0048 */
266 __be32 s_max_transaction; /* Limit of journal blocks per trans.*/
267 __be32 s_max_trans_data; /* Limit of data blocks per trans. */
268
269/* 0x0050 */
Darrick J. Wong8f888ef2012-05-22 22:43:41 -0400270 __u8 s_checksum_type; /* checksum type */
271 __u8 s_padding2[3];
272 __u32 s_padding[42];
273 __be32 s_checksum; /* crc32c(superblock) */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700274
275/* 0x0100 */
276 __u8 s_users[16*48]; /* ids of all fs'es sharing the log */
277/* 0x0400 */
278} journal_superblock_t;
279
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700280#define JBD2_HAS_COMPAT_FEATURE(j,mask) \
Dave Kleikamp470decc2006-10-11 01:20:57 -0700281 ((j)->j_format_version >= 2 && \
282 ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask))))
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700283#define JBD2_HAS_RO_COMPAT_FEATURE(j,mask) \
Dave Kleikamp470decc2006-10-11 01:20:57 -0700284 ((j)->j_format_version >= 2 && \
285 ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask))))
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700286#define JBD2_HAS_INCOMPAT_FEATURE(j,mask) \
Dave Kleikamp470decc2006-10-11 01:20:57 -0700287 ((j)->j_format_version >= 2 && \
288 ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask))))
289
Girish Shilamkar818d2762008-01-28 23:58:27 -0500290#define JBD2_FEATURE_COMPAT_CHECKSUM 0x00000001
291
292#define JBD2_FEATURE_INCOMPAT_REVOKE 0x00000001
293#define JBD2_FEATURE_INCOMPAT_64BIT 0x00000002
294#define JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT 0x00000004
Darrick J. Wong8f888ef2012-05-22 22:43:41 -0400295#define JBD2_FEATURE_INCOMPAT_CSUM_V2 0x00000008
Darrick J. Wongdb9ee222014-08-27 18:40:07 -0400296#define JBD2_FEATURE_INCOMPAT_CSUM_V3 0x00000010
Dave Kleikamp470decc2006-10-11 01:20:57 -0700297
298/* Features known to this kernel version: */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500299#define JBD2_KNOWN_COMPAT_FEATURES JBD2_FEATURE_COMPAT_CHECKSUM
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700300#define JBD2_KNOWN_ROCOMPAT_FEATURES 0
Zach Brownb517bea2006-10-11 01:21:08 -0700301#define JBD2_KNOWN_INCOMPAT_FEATURES (JBD2_FEATURE_INCOMPAT_REVOKE | \
Girish Shilamkar818d2762008-01-28 23:58:27 -0500302 JBD2_FEATURE_INCOMPAT_64BIT | \
Darrick J. Wonge93376c2012-05-27 08:12:42 -0400303 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | \
Darrick J. Wongdb9ee222014-08-27 18:40:07 -0400304 JBD2_FEATURE_INCOMPAT_CSUM_V2 | \
305 JBD2_FEATURE_INCOMPAT_CSUM_V3)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700306
307#ifdef __KERNEL__
308
309#include <linux/fs.h>
310#include <linux/sched.h>
Jan Karab34090e2013-06-04 12:08:56 -0400311
312enum jbd_state_bits {
313 BH_JBD /* Has an attached ext3 journal_head */
314 = BH_PrivateStart,
315 BH_JWrite, /* Being written to log (@@@ DEBUGGING) */
316 BH_Freed, /* Has been freed (truncated) */
317 BH_Revoked, /* Has been revoked from the log */
318 BH_RevokeValid, /* Revoked flag is valid */
319 BH_JBDDirty, /* Is dirty but journaled */
320 BH_State, /* Pins most journal_head state */
321 BH_JournalHead, /* Pins bh->b_private and jh->b_bh */
322 BH_Shadow, /* IO on shadow buffer is running */
323 BH_Verified, /* Metadata block has been verified ok */
324 BH_JBDPrivateStart, /* First bit available for private use by FS */
325};
326
327BUFFER_FNS(JBD, jbd)
328BUFFER_FNS(JWrite, jwrite)
329BUFFER_FNS(JBDDirty, jbddirty)
330TAS_BUFFER_FNS(JBDDirty, jbddirty)
331BUFFER_FNS(Revoked, revoked)
332TAS_BUFFER_FNS(Revoked, revoked)
333BUFFER_FNS(RevokeValid, revokevalid)
334TAS_BUFFER_FNS(RevokeValid, revokevalid)
335BUFFER_FNS(Freed, freed)
336BUFFER_FNS(Shadow, shadow)
337BUFFER_FNS(Verified, verified)
338
Thomas Gleixner44606672011-10-27 04:38:18 -0400339#include <linux/jbd_common.h>
Dave Kleikamp470decc2006-10-11 01:20:57 -0700340
Chris Snook36df53f2008-01-28 23:58:27 -0500341#define J_ASSERT(assert) BUG_ON(!(assert))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700342
Dave Kleikamp470decc2006-10-11 01:20:57 -0700343#define J_ASSERT_BH(bh, expr) J_ASSERT(expr)
344#define J_ASSERT_JH(jh, expr) J_ASSERT(expr)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700345
Mingming Caocd02ff02007-10-16 18:38:25 -0400346#if defined(JBD2_PARANOID_IOFAIL)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700347#define J_EXPECT(expr, why...) J_ASSERT(expr)
348#define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr)
349#define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr)
350#else
351#define __journal_expect(expr, why...) \
352 ({ \
353 int val = (expr); \
354 if (!val) { \
355 printk(KERN_ERR \
Theodore Ts'o08ec8c32009-01-16 11:57:00 -0500356 "JBD2 unexpected failure: %s: %s;\n", \
357 __func__, #expr); \
Dave Kleikamp470decc2006-10-11 01:20:57 -0700358 printk(KERN_ERR why "\n"); \
359 } \
360 val; \
361 })
362#define J_EXPECT(expr, why...) __journal_expect(expr, ## why)
363#define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why)
364#define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why)
365#endif
366
Jan Karac851ed52008-07-11 19:27:31 -0400367/* Flags in jbd_inode->i_flags */
368#define __JI_COMMIT_RUNNING 0
369/* Commit of the inode data in progress. We use this flag to protect us from
370 * concurrent deletion of inode. We cannot use reference to inode for this
371 * since we cannot afford doing last iput() on behalf of kjournald
372 */
373#define JI_COMMIT_RUNNING (1 << __JI_COMMIT_RUNNING)
374
375/**
376 * struct jbd_inode is the structure linking inodes in ordered mode
377 * present in a transaction so that we can sync them during commit.
378 */
379struct jbd2_inode {
380 /* Which transaction does this inode belong to? Either the running
381 * transaction or the committing one. [j_list_lock] */
382 transaction_t *i_transaction;
383
384 /* Pointer to the running transaction modifying inode's data in case
385 * there is already a committing transaction touching it. [j_list_lock] */
386 transaction_t *i_next_transaction;
387
388 /* List of inodes in the i_transaction [j_list_lock] */
389 struct list_head i_list;
390
391 /* VFS inode this inode belongs to [constant during the lifetime
392 * of the structure] */
393 struct inode *i_vfs_inode;
394
395 /* Flags of inode [j_list_lock] */
Brian King39e3ac22010-10-27 21:25:12 -0400396 unsigned long i_flags;
Jan Karac851ed52008-07-11 19:27:31 -0400397};
398
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700399struct jbd2_revoke_table_s;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700400
401/**
402 * struct handle_s - The handle_s type is the concrete type associated with
403 * handle_t.
404 * @h_transaction: Which compound transaction is this update a part of?
405 * @h_buffer_credits: Number of remaining buffers we are allowed to dirty.
406 * @h_ref: Reference count on this handle
407 * @h_err: Field for caller's use to track errors through large fs operations
408 * @h_sync: flag for sync-on-close
409 * @h_jdata: flag to force data journaling
410 * @h_aborted: flag indicating fatal error on handle
411 **/
412
413/* Docbook can't yet cope with the bit fields, but will leave the documentation
414 * in so it can be fixed later.
415 */
416
Theodore Ts'o8aefcd52011-01-10 12:29:43 -0500417struct jbd2_journal_handle
Dave Kleikamp470decc2006-10-11 01:20:57 -0700418{
Jan Kara8f7d89f2013-06-04 12:35:11 -0400419 union {
420 /* Which compound transaction is this update a part of? */
421 transaction_t *h_transaction;
422 /* Which journal handle belongs to - used iff h_reserved set */
423 journal_t *h_journal;
424 };
425
426 /* Handle reserved for finishing the logical operation */
427 handle_t *h_rsv_handle;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700428
429 /* Number of remaining buffers we are allowed to dirty: */
430 int h_buffer_credits;
431
432 /* Reference count on this handle */
433 int h_ref;
434
435 /* Field for caller's use to track errors through large fs */
436 /* operations */
437 int h_err;
438
439 /* Flags [no locking] */
Theodore Ts'o078d5032013-02-07 00:02:15 -0500440 unsigned int h_sync: 1; /* sync-on-close */
441 unsigned int h_jdata: 1; /* force data journaling */
Jan Kara8f7d89f2013-06-04 12:35:11 -0400442 unsigned int h_reserved: 1; /* handle with reserved credits */
Theodore Ts'o078d5032013-02-07 00:02:15 -0500443 unsigned int h_aborted: 1; /* fatal error on handle */
Theodore Ts'o343d9c22013-02-08 13:00:22 -0500444 unsigned int h_type: 8; /* for handle statistics */
445 unsigned int h_line_no: 16; /* for handle statistics */
446
447 unsigned long h_start_jiffies;
448 unsigned int h_requested_credits;
Mingming Cao7b751062008-01-28 23:58:27 -0500449
450#ifdef CONFIG_DEBUG_LOCK_ALLOC
451 struct lockdep_map h_lockdep_map;
452#endif
Dave Kleikamp470decc2006-10-11 01:20:57 -0700453};
454
455
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500456/*
457 * Some stats for checkpoint phase
458 */
459struct transaction_chp_stats_s {
460 unsigned long cs_chp_time;
Theodore Ts'obf699322009-09-30 00:32:06 -0400461 __u32 cs_forced_to_close;
462 __u32 cs_written;
463 __u32 cs_dropped;
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500464};
465
Dave Kleikamp470decc2006-10-11 01:20:57 -0700466/* The transaction_t type is the guts of the journaling mechanism. It
467 * tracks a compound transaction through its various states:
468 *
469 * RUNNING: accepting new updates
470 * LOCKED: Updates still running but we don't accept new ones
471 * RUNDOWN: Updates are tidying up but have finished requesting
472 * new buffers to modify (state not used for now)
473 * FLUSH: All updates complete, but we are still writing to disk
474 * COMMIT: All data on disk, writing commit record
475 * FINISHED: We still have to keep the transaction for checkpointing.
476 *
477 * The transaction keeps track of all of the buffers modified by a
478 * running transaction, and all of the buffers committed but not yet
479 * flushed to home for finished transactions.
480 */
481
482/*
483 * Lock ranking:
484 *
485 * j_list_lock
486 * ->jbd_lock_bh_journal_head() (This is "innermost")
487 *
488 * j_state_lock
489 * ->jbd_lock_bh_state()
490 *
491 * jbd_lock_bh_state()
492 * ->j_list_lock
493 *
494 * j_state_lock
495 * ->t_handle_lock
496 *
497 * j_state_lock
498 * ->j_list_lock (journal_unmap_buffer)
499 *
500 */
501
502struct transaction_s
503{
504 /* Pointer to the journal for this transaction. [no locking] */
505 journal_t *t_journal;
506
507 /* Sequence number for this transaction [no locking] */
508 tid_t t_tid;
509
510 /*
511 * Transaction's current state
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700512 * [no locking - only kjournald2 alters this]
Jan Karaf5a7a6b2008-01-28 23:58:27 -0500513 * [j_list_lock] guards transition of a transaction into T_FINISHED
514 * state and subsequent call of __jbd2_journal_drop_transaction()
Dave Kleikamp470decc2006-10-11 01:20:57 -0700515 * FIXME: needs barriers
516 * KLUDGE: [use j_state_lock]
517 */
518 enum {
519 T_RUNNING,
520 T_LOCKED,
Dave Kleikamp470decc2006-10-11 01:20:57 -0700521 T_FLUSH,
522 T_COMMIT,
Jan Karabbd2be32011-05-24 11:59:18 -0400523 T_COMMIT_DFLUSH,
524 T_COMMIT_JFLUSH,
Dmitry Monakhov794446c2013-04-03 22:06:52 -0400525 T_COMMIT_CALLBACK,
Dave Kleikamp470decc2006-10-11 01:20:57 -0700526 T_FINISHED
527 } t_state;
528
529 /*
530 * Where in the log does this transaction's commit start? [no locking]
531 */
532 unsigned long t_log_start;
533
534 /* Number of buffers on the t_buffers list [j_list_lock] */
535 int t_nr_buffers;
536
537 /*
538 * Doubly-linked circular list of all buffers reserved but not yet
539 * modified by this transaction [j_list_lock]
540 */
541 struct journal_head *t_reserved_list;
542
543 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700544 * Doubly-linked circular list of all metadata buffers owned by this
545 * transaction [j_list_lock]
546 */
547 struct journal_head *t_buffers;
548
549 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700550 * Doubly-linked circular list of all forget buffers (superseded
551 * buffers which we can un-checkpoint once this transaction commits)
552 * [j_list_lock]
553 */
554 struct journal_head *t_forget;
555
556 /*
557 * Doubly-linked circular list of all buffers still to be flushed before
558 * this transaction can be checkpointed. [j_list_lock]
559 */
560 struct journal_head *t_checkpoint_list;
561
562 /*
563 * Doubly-linked circular list of all buffers submitted for IO while
564 * checkpointing. [j_list_lock]
565 */
566 struct journal_head *t_checkpoint_io_list;
567
568 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700569 * Doubly-linked circular list of metadata buffers being shadowed by log
570 * IO. The IO buffers on the iobuf list and the shadow buffers on this
571 * list match each other one for one at all times. [j_list_lock]
572 */
573 struct journal_head *t_shadow_list;
574
575 /*
Jan Karac851ed52008-07-11 19:27:31 -0400576 * List of inodes whose data we've modified in data=ordered mode.
577 * [j_list_lock]
578 */
579 struct list_head t_inode_list;
580
581 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700582 * Protects info related to handles
583 */
584 spinlock_t t_handle_lock;
585
586 /*
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500587 * Longest time some handle had to wait for running transaction
588 */
589 unsigned long t_max_wait;
590
591 /*
592 * When transaction started
593 */
594 unsigned long t_start;
595
596 /*
Theodore Ts'o9fff24a2013-02-06 22:30:23 -0500597 * When commit was requested
598 */
599 unsigned long t_requested;
600
601 /*
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500602 * Checkpointing stats [j_checkpoint_sem]
603 */
604 struct transaction_chp_stats_s t_chp_stats;
605
606 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700607 * Number of outstanding updates running on this transaction
608 * [t_handle_lock]
609 */
Theodore Ts'oa51dca92010-08-02 08:43:25 -0400610 atomic_t t_updates;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700611
612 /*
613 * Number of buffers reserved for use by all handles in this transaction
614 * handle but not yet modified. [t_handle_lock]
615 */
Theodore Ts'oa51dca92010-08-02 08:43:25 -0400616 atomic_t t_outstanding_credits;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700617
618 /*
619 * Forward and backward links for the circular list of all transactions
620 * awaiting checkpoint. [j_list_lock]
621 */
622 transaction_t *t_cpnext, *t_cpprev;
623
624 /*
625 * When will the transaction expire (become due for commit), in jiffies?
626 * [no locking]
627 */
628 unsigned long t_expires;
629
630 /*
Josef Bacike07f7182008-11-26 01:14:26 -0500631 * When this transaction started, in nanoseconds [no locking]
632 */
633 ktime_t t_start_time;
634
635 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700636 * How many handles used this transaction? [t_handle_lock]
637 */
Theodore Ts'o8dd42042010-08-03 21:38:29 -0400638 atomic_t t_handle_count;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700639
Theodore Ts'o3e624fc2008-10-16 20:00:24 -0400640 /*
Theodore Ts'o70585482009-03-25 23:35:46 -0400641 * This transaction is being forced and some process is
642 * waiting for it to finish.
643 */
H Hartley Sweeten0ccff1a2009-08-17 22:38:04 -0400644 unsigned int t_synchronous_commit:1;
Jan Kara81be12c2011-05-24 11:52:40 -0400645
646 /* Disk flush needs to be sent to fs partition [no locking] */
647 int t_need_data_flush;
Theodore Ts'o70585482009-03-25 23:35:46 -0400648
649 /*
Theodore Ts'o3e624fc2008-10-16 20:00:24 -0400650 * For use by the filesystem to store fs-specific data
651 * structures associated with the transaction
652 */
653 struct list_head t_private_list;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700654};
655
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500656struct transaction_run_stats_s {
657 unsigned long rs_wait;
Theodore Ts'o9fff24a2013-02-06 22:30:23 -0500658 unsigned long rs_request_delay;
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500659 unsigned long rs_running;
660 unsigned long rs_locked;
661 unsigned long rs_flushing;
662 unsigned long rs_logging;
663
Theodore Ts'obf699322009-09-30 00:32:06 -0400664 __u32 rs_handle_count;
665 __u32 rs_blocks;
666 __u32 rs_blocks_logged;
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500667};
668
669struct transaction_stats_s {
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500670 unsigned long ts_tid;
Theodore Ts'o9fff24a2013-02-06 22:30:23 -0500671 unsigned long ts_requested;
Theodore Ts'obf699322009-09-30 00:32:06 -0400672 struct transaction_run_stats_s run;
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500673};
674
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500675static inline unsigned long
676jbd2_time_diff(unsigned long start, unsigned long end)
677{
678 if (end >= start)
679 return end - start;
680
681 return end + (MAX_JIFFY_OFFSET - start);
682}
683
Theodore Ts'o1a0d3782008-11-05 00:09:22 -0500684#define JBD2_NR_BATCH 64
685
Dave Kleikamp470decc2006-10-11 01:20:57 -0700686/**
687 * struct journal_s - The journal_s type is the concrete type associated with
688 * journal_t.
689 * @j_flags: General journaling state flags
690 * @j_errno: Is there an outstanding uncleared error on the journal (from a
691 * prior abort)?
692 * @j_sb_buffer: First part of superblock buffer
693 * @j_superblock: Second part of superblock buffer
694 * @j_format_version: Version of the superblock format
695 * @j_state_lock: Protect the various scalars in the journal
696 * @j_barrier_count: Number of processes waiting to create a barrier lock
697 * @j_barrier: The barrier lock itself
698 * @j_running_transaction: The current running transaction..
699 * @j_committing_transaction: the transaction we are pushing to disk
700 * @j_checkpoint_transactions: a linked circular list of all transactions
701 * waiting for checkpointing
702 * @j_wait_transaction_locked: Wait queue for waiting for a locked transaction
703 * to start committing, or for a barrier lock to be released
Dave Kleikamp470decc2006-10-11 01:20:57 -0700704 * @j_wait_done_commit: Wait queue for waiting for commit to complete
Dave Kleikamp470decc2006-10-11 01:20:57 -0700705 * @j_wait_commit: Wait queue to trigger commit
706 * @j_wait_updates: Wait queue to wait for updates to complete
Jan Kara8f7d89f2013-06-04 12:35:11 -0400707 * @j_wait_reserved: Wait queue to wait for reserved buffer credits to drop
Dave Kleikamp470decc2006-10-11 01:20:57 -0700708 * @j_checkpoint_mutex: Mutex for locking against concurrent checkpoints
709 * @j_head: Journal head - identifies the first unused block in the journal
710 * @j_tail: Journal tail - identifies the oldest still-used block in the
711 * journal.
712 * @j_free: Journal free - how many free blocks are there in the journal?
713 * @j_first: The block number of the first usable block
714 * @j_last: The block number one beyond the last usable block
715 * @j_dev: Device where we store the journal
716 * @j_blocksize: blocksize for the location where we store the journal.
717 * @j_blk_offset: starting block offset for into the device where we store the
718 * journal
719 * @j_fs_dev: Device which holds the client fs. For internal journal this will
720 * be equal to j_dev
Jan Kara8f7d89f2013-06-04 12:35:11 -0400721 * @j_reserved_credits: Number of buffers reserved from the running transaction
Dave Kleikamp470decc2006-10-11 01:20:57 -0700722 * @j_maxlen: Total maximum capacity of the journal region on disk.
723 * @j_list_lock: Protects the buffer lists and internal buffer state.
724 * @j_inode: Optional inode where we store the journal. If present, all journal
725 * block numbers are mapped into this inode via bmap().
726 * @j_tail_sequence: Sequence number of the oldest transaction in the log
727 * @j_transaction_sequence: Sequence number of the next transaction to grant
728 * @j_commit_sequence: Sequence number of the most recently committed
729 * transaction
730 * @j_commit_request: Sequence number of the most recent transaction wanting
731 * commit
732 * @j_uuid: Uuid of client object.
733 * @j_task: Pointer to the current commit thread for this journal
734 * @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a
735 * single compound commit transaction
736 * @j_commit_interval: What is the maximum transaction lifetime before we begin
737 * a commit?
738 * @j_commit_timer: The timer used to wakeup the commit thread
739 * @j_revoke_lock: Protect the revoke table
740 * @j_revoke: The revoke table - maintains the list of revoked blocks in the
741 * current transaction.
742 * @j_revoke_table: alternate revoke tables for j_revoke
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700743 * @j_wbuf: array of buffer_heads for jbd2_journal_commit_transaction
Dave Kleikamp470decc2006-10-11 01:20:57 -0700744 * @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the
745 * number that will fit in j_blocksize
746 * @j_last_sync_writer: most recent pid which did a synchronous write
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500747 * @j_history: Buffer storing the transactions statistics history
748 * @j_history_max: Maximum number of transactions in the statistics history
749 * @j_history_cur: Current number of transactions in the statistics history
750 * @j_history_lock: Protect the transactions statistics history
751 * @j_proc_entry: procfs entry for the jbd statistics directory
752 * @j_stats: Overall statistics
Dave Kleikamp470decc2006-10-11 01:20:57 -0700753 * @j_private: An opaque pointer to fs-private information.
754 */
755
756struct journal_s
757{
758 /* General journaling state flags [j_state_lock] */
759 unsigned long j_flags;
760
761 /*
762 * Is there an outstanding uncleared error on the journal (from a prior
763 * abort)? [j_state_lock]
764 */
765 int j_errno;
766
767 /* The superblock buffer */
768 struct buffer_head *j_sb_buffer;
769 journal_superblock_t *j_superblock;
770
771 /* Version of the superblock format */
772 int j_format_version;
773
774 /*
775 * Protect the various scalars in the journal
776 */
Theodore Ts'oa931da62010-08-03 21:35:12 -0400777 rwlock_t j_state_lock;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700778
779 /*
780 * Number of processes waiting to create a barrier lock [j_state_lock]
781 */
782 int j_barrier_count;
783
784 /* The barrier lock itself */
785 struct mutex j_barrier;
786
787 /*
788 * Transactions: The current running transaction...
789 * [j_state_lock] [caller holding open handle]
790 */
791 transaction_t *j_running_transaction;
792
793 /*
794 * the transaction we are pushing to disk
795 * [j_state_lock] [caller holding open handle]
796 */
797 transaction_t *j_committing_transaction;
798
799 /*
800 * ... and a linked circular list of all transactions waiting for
801 * checkpointing. [j_list_lock]
802 */
803 transaction_t *j_checkpoint_transactions;
804
805 /*
806 * Wait queue for waiting for a locked transaction to start committing,
807 * or for a barrier lock to be released
808 */
809 wait_queue_head_t j_wait_transaction_locked;
810
Dave Kleikamp470decc2006-10-11 01:20:57 -0700811 /* Wait queue for waiting for commit to complete */
812 wait_queue_head_t j_wait_done_commit;
813
Dave Kleikamp470decc2006-10-11 01:20:57 -0700814 /* Wait queue to trigger commit */
815 wait_queue_head_t j_wait_commit;
816
817 /* Wait queue to wait for updates to complete */
818 wait_queue_head_t j_wait_updates;
819
Jan Kara8f7d89f2013-06-04 12:35:11 -0400820 /* Wait queue to wait for reserved buffer credits to drop */
821 wait_queue_head_t j_wait_reserved;
822
Dave Kleikamp470decc2006-10-11 01:20:57 -0700823 /* Semaphore for locking against concurrent checkpoints */
824 struct mutex j_checkpoint_mutex;
825
826 /*
Theodore Ts'o1a0d3782008-11-05 00:09:22 -0500827 * List of buffer heads used by the checkpoint routine. This
828 * was moved from jbd2_log_do_checkpoint() to reduce stack
829 * usage. Access to this array is controlled by the
830 * j_checkpoint_mutex. [j_checkpoint_mutex]
831 */
832 struct buffer_head *j_chkpt_bhs[JBD2_NR_BATCH];
833
834 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700835 * Journal head: identifies the first unused block in the journal.
836 * [j_state_lock]
837 */
838 unsigned long j_head;
839
840 /*
841 * Journal tail: identifies the oldest still-used block in the journal.
842 * [j_state_lock]
843 */
844 unsigned long j_tail;
845
846 /*
847 * Journal free: how many free blocks are there in the journal?
848 * [j_state_lock]
849 */
850 unsigned long j_free;
851
852 /*
853 * Journal start and end: the block numbers of the first usable block
854 * and one beyond the last usable block in the journal. [j_state_lock]
855 */
856 unsigned long j_first;
857 unsigned long j_last;
858
859 /*
860 * Device, blocksize and starting block offset for the location where we
861 * store the journal.
862 */
863 struct block_device *j_dev;
864 int j_blocksize;
Theodore Ts'o05496762008-09-16 14:36:17 -0400865 unsigned long long j_blk_offset;
866 char j_devname[BDEVNAME_SIZE+24];
Dave Kleikamp470decc2006-10-11 01:20:57 -0700867
868 /*
869 * Device which holds the client fs. For internal journal this will be
870 * equal to j_dev.
871 */
872 struct block_device *j_fs_dev;
873
874 /* Total maximum capacity of the journal region on disk. */
875 unsigned int j_maxlen;
876
Jan Kara8f7d89f2013-06-04 12:35:11 -0400877 /* Number of buffers reserved from the running transaction */
878 atomic_t j_reserved_credits;
879
Dave Kleikamp470decc2006-10-11 01:20:57 -0700880 /*
881 * Protects the buffer lists and internal buffer state.
882 */
883 spinlock_t j_list_lock;
884
885 /* Optional inode where we store the journal. If present, all */
886 /* journal block numbers are mapped into this inode via */
887 /* bmap(). */
888 struct inode *j_inode;
889
890 /*
891 * Sequence number of the oldest transaction in the log [j_state_lock]
892 */
893 tid_t j_tail_sequence;
894
895 /*
896 * Sequence number of the next transaction to grant [j_state_lock]
897 */
898 tid_t j_transaction_sequence;
899
900 /*
901 * Sequence number of the most recently committed transaction
902 * [j_state_lock].
903 */
904 tid_t j_commit_sequence;
905
906 /*
907 * Sequence number of the most recent transaction wanting commit
908 * [j_state_lock]
909 */
910 tid_t j_commit_request;
911
912 /*
913 * Journal uuid: identifies the object (filesystem, LVM volume etc)
914 * backed by this journal. This will eventually be replaced by an array
915 * of uuids, allowing us to index multiple devices within a single
916 * journal and to perform atomic updates across them.
917 */
918 __u8 j_uuid[16];
919
920 /* Pointer to the current commit thread for this journal */
921 struct task_struct *j_task;
922
923 /*
924 * Maximum number of metadata buffers to allow in a single compound
925 * commit transaction
926 */
927 int j_max_transaction_buffers;
928
929 /*
930 * What is the maximum transaction lifetime before we begin a commit?
931 */
932 unsigned long j_commit_interval;
933
934 /* The timer used to wakeup the commit thread: */
935 struct timer_list j_commit_timer;
936
937 /*
938 * The revoke table: maintains the list of revoked blocks in the
939 * current transaction. [j_revoke_lock]
940 */
941 spinlock_t j_revoke_lock;
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700942 struct jbd2_revoke_table_s *j_revoke;
943 struct jbd2_revoke_table_s *j_revoke_table[2];
Dave Kleikamp470decc2006-10-11 01:20:57 -0700944
945 /*
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700946 * array of bhs for jbd2_journal_commit_transaction
Dave Kleikamp470decc2006-10-11 01:20:57 -0700947 */
948 struct buffer_head **j_wbuf;
949 int j_wbufsize;
950
Josef Bacike07f7182008-11-26 01:14:26 -0500951 /*
952 * this is the pid of hte last person to run a synchronous operation
953 * through the journal
954 */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700955 pid_t j_last_sync_writer;
956
Josef Bacike07f7182008-11-26 01:14:26 -0500957 /*
958 * the average amount of time in nanoseconds it takes to commit a
959 * transaction to disk. [j_state_lock]
960 */
961 u64 j_average_commit_time;
962
Theodore Ts'o30773842009-01-03 20:27:38 -0500963 /*
964 * minimum and maximum times that we should wait for
965 * additional filesystem operations to get batched into a
966 * synchronous handle in microseconds
967 */
968 u32 j_min_batch_time;
969 u32 j_max_batch_time;
970
Theodore Ts'o3e624fc2008-10-16 20:00:24 -0400971 /* This function is called when a transaction is closed */
972 void (*j_commit_callback)(journal_t *,
973 transaction_t *);
974
Dave Kleikamp470decc2006-10-11 01:20:57 -0700975 /*
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500976 * Journal statistics
977 */
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500978 spinlock_t j_history_lock;
979 struct proc_dir_entry *j_proc_entry;
980 struct transaction_stats_s j_stats;
981
Theodore Ts'o624080e2008-06-06 17:50:40 -0400982 /* Failed journal commit ID */
983 unsigned int j_failed_commit;
984
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500985 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700986 * An opaque pointer to fs-private information. ext3 puts its
987 * superblock pointer here
988 */
989 void *j_private;
Darrick J. Wong01b5adc2012-05-27 07:50:56 -0400990
991 /* Reference to checksum algorithm driver via cryptoapi */
992 struct crypto_shash *j_chksum_driver;
Darrick J. Wong4fd5ea42012-05-27 08:08:22 -0400993
994 /* Precomputed journal UUID checksum for seeding other checksums */
995 __u32 j_csum_seed;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700996};
997
998/*
999 * Journal flag definitions
1000 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001001#define JBD2_UNMOUNT 0x001 /* Journal thread is being destroyed */
1002#define JBD2_ABORT 0x002 /* Journaling has been aborted for errors. */
1003#define JBD2_ACK_ERR 0x004 /* The errno in the sb has been acked */
1004#define JBD2_FLUSHED 0x008 /* The journal superblock has been flushed */
1005#define JBD2_LOADED 0x010 /* The journal superblock has been loaded */
1006#define JBD2_BARRIER 0x020 /* Use IDE barriers */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001007#define JBD2_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file
1008 * data write error in ordered
1009 * mode */
Dave Kleikamp470decc2006-10-11 01:20:57 -07001010
1011/*
1012 * Function declarations for the journaling transaction and buffer
1013 * management
1014 */
1015
1016/* Filing buffers */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001017extern void jbd2_journal_unfile_buffer(journal_t *, struct journal_head *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001018extern void __jbd2_journal_refile_buffer(struct journal_head *);
1019extern void jbd2_journal_refile_buffer(journal_t *, struct journal_head *);
1020extern void __jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001021extern void __journal_free_buffer(struct journal_head *bh);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001022extern void jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001023extern void __journal_clean_data_list(transaction_t *transaction);
Jan Karaf5113ef2013-06-04 12:01:45 -04001024static inline void jbd2_file_log_bh(struct list_head *head, struct buffer_head *bh)
1025{
1026 list_add_tail(&bh->b_assoc_buffers, head);
1027}
1028static inline void jbd2_unfile_log_bh(struct buffer_head *bh)
1029{
1030 list_del_init(&bh->b_assoc_buffers);
1031}
Dave Kleikamp470decc2006-10-11 01:20:57 -07001032
1033/* Log buffer allocation */
Jan Karae5a120a2013-06-04 12:06:01 -04001034struct buffer_head *jbd2_journal_get_descriptor_buffer(journal_t *journal);
Mingming Cao18eba7a2006-10-11 01:21:13 -07001035int jbd2_journal_next_log_block(journal_t *, unsigned long long *);
Jan Kara79feb522012-03-13 22:22:54 -04001036int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid,
1037 unsigned long *block);
1038void __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block);
Jan Kara33395782012-03-13 22:45:38 -04001039void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001040
1041/* Commit management */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001042extern void jbd2_journal_commit_transaction(journal_t *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001043
1044/* Checkpoint list management */
Jan Kara50849db2014-09-18 00:58:12 -04001045void __jbd2_journal_clean_checkpoint_list(journal_t *journal);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001046int __jbd2_journal_remove_checkpoint(struct journal_head *);
1047void __jbd2_journal_insert_checkpoint(struct journal_head *, transaction_t *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001048
Joel Beckere06c8222008-09-11 15:35:47 -07001049
1050/*
1051 * Triggers
1052 */
1053
1054struct jbd2_buffer_trigger_type {
1055 /*
Jan Kara13ceef02010-07-14 07:56:33 +02001056 * Fired a the moment data to write to the journal are known to be
1057 * stable - so either at the moment b_frozen_data is created or just
1058 * before a buffer is written to the journal. mapped_data is a mapped
1059 * buffer that is the frozen data for commit.
Joel Beckere06c8222008-09-11 15:35:47 -07001060 */
Jan Kara13ceef02010-07-14 07:56:33 +02001061 void (*t_frozen)(struct jbd2_buffer_trigger_type *type,
Joel Beckere06c8222008-09-11 15:35:47 -07001062 struct buffer_head *bh, void *mapped_data,
1063 size_t size);
1064
1065 /*
1066 * Fired during journal abort for dirty buffers that will not be
1067 * committed.
1068 */
1069 void (*t_abort)(struct jbd2_buffer_trigger_type *type,
1070 struct buffer_head *bh);
1071};
1072
Jan Kara13ceef02010-07-14 07:56:33 +02001073extern void jbd2_buffer_frozen_trigger(struct journal_head *jh,
Joel Beckere06c8222008-09-11 15:35:47 -07001074 void *mapped_data,
1075 struct jbd2_buffer_trigger_type *triggers);
1076extern void jbd2_buffer_abort_trigger(struct journal_head *jh,
1077 struct jbd2_buffer_trigger_type *triggers);
1078
Dave Kleikamp470decc2006-10-11 01:20:57 -07001079/* Buffer IO */
Jan Karaf5113ef2013-06-04 12:01:45 -04001080extern int jbd2_journal_write_metadata_buffer(transaction_t *transaction,
1081 struct journal_head *jh_in,
1082 struct buffer_head **bh_out,
1083 sector_t blocknr);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001084
1085/* Transaction locking */
1086extern void __wait_on_journal (journal_t *);
1087
Yongqiang Yang0c2022e2012-02-20 17:53:02 -05001088/* Transaction cache support */
1089extern void jbd2_journal_destroy_transaction_cache(void);
1090extern int jbd2_journal_init_transaction_cache(void);
1091extern void jbd2_journal_free_transaction(transaction_t *);
1092
Dave Kleikamp470decc2006-10-11 01:20:57 -07001093/*
1094 * Journal locking.
1095 *
1096 * We need to lock the journal during transaction state changes so that nobody
1097 * ever tries to take a handle on the running transaction while we are in the
1098 * middle of moving it to the commit phase. j_state_lock does this.
1099 *
1100 * Note that the locking is completely interrupt unsafe. We never touch
1101 * journal structures from interrupts.
1102 */
1103
1104static inline handle_t *journal_current_handle(void)
1105{
1106 return current->journal_info;
1107}
1108
1109/* The journaling code user interface:
1110 *
1111 * Create and destroy handles
1112 * Register buffer modifications against the current transaction.
1113 */
1114
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001115extern handle_t *jbd2_journal_start(journal_t *, int nblocks);
Jan Kara8f7d89f2013-06-04 12:35:11 -04001116extern handle_t *jbd2__journal_start(journal_t *, int blocks, int rsv_blocks,
1117 gfp_t gfp_mask, unsigned int type,
1118 unsigned int line_no);
Theodore Ts'o47def822010-07-27 11:56:05 -04001119extern int jbd2_journal_restart(handle_t *, int nblocks);
Dan Carpenterd2159fb2011-09-04 10:20:14 -04001120extern int jbd2__journal_restart(handle_t *, int nblocks, gfp_t gfp_mask);
Jan Kara8f7d89f2013-06-04 12:35:11 -04001121extern int jbd2_journal_start_reserved(handle_t *handle,
1122 unsigned int type, unsigned int line_no);
1123extern void jbd2_journal_free_reserved(handle_t *handle);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001124extern int jbd2_journal_extend (handle_t *, int nblocks);
1125extern int jbd2_journal_get_write_access(handle_t *, struct buffer_head *);
1126extern int jbd2_journal_get_create_access (handle_t *, struct buffer_head *);
1127extern int jbd2_journal_get_undo_access(handle_t *, struct buffer_head *);
Joel Beckere06c8222008-09-11 15:35:47 -07001128void jbd2_journal_set_triggers(struct buffer_head *,
1129 struct jbd2_buffer_trigger_type *type);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001130extern int jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001131extern int jbd2_journal_forget (handle_t *, struct buffer_head *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001132extern void journal_sync_buffer (struct buffer_head *);
Jan Kara53e87262012-12-25 13:29:52 -05001133extern int jbd2_journal_invalidatepage(journal_t *,
Lukas Czerner259709b2013-05-21 23:20:03 -04001134 struct page *, unsigned int, unsigned int);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001135extern int jbd2_journal_try_to_free_buffers(journal_t *, struct page *, gfp_t);
1136extern int jbd2_journal_stop(handle_t *);
1137extern int jbd2_journal_flush (journal_t *);
1138extern void jbd2_journal_lock_updates (journal_t *);
1139extern void jbd2_journal_unlock_updates (journal_t *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001140
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001141extern journal_t * jbd2_journal_init_dev(struct block_device *bdev,
Dave Kleikamp470decc2006-10-11 01:20:57 -07001142 struct block_device *fs_dev,
Mingming Cao18eba7a2006-10-11 01:21:13 -07001143 unsigned long long start, int len, int bsize);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001144extern journal_t * jbd2_journal_init_inode (struct inode *);
1145extern int jbd2_journal_update_format (journal_t *);
1146extern int jbd2_journal_check_used_features
Dave Kleikamp470decc2006-10-11 01:20:57 -07001147 (journal_t *, unsigned long, unsigned long, unsigned long);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001148extern int jbd2_journal_check_available_features
Dave Kleikamp470decc2006-10-11 01:20:57 -07001149 (journal_t *, unsigned long, unsigned long, unsigned long);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001150extern int jbd2_journal_set_features
Dave Kleikamp470decc2006-10-11 01:20:57 -07001151 (journal_t *, unsigned long, unsigned long, unsigned long);
Girish Shilamkar818d2762008-01-28 23:58:27 -05001152extern void jbd2_journal_clear_features
1153 (journal_t *, unsigned long, unsigned long, unsigned long);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001154extern int jbd2_journal_load (journal_t *journal);
Hidehiro Kawai44519fa2008-10-10 20:29:13 -04001155extern int jbd2_journal_destroy (journal_t *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001156extern int jbd2_journal_recover (journal_t *journal);
1157extern int jbd2_journal_wipe (journal_t *, int);
1158extern int jbd2_journal_skip_recovery (journal_t *);
Theodore Ts'od796c522012-08-05 19:04:57 -04001159extern void jbd2_journal_update_sb_errno(journal_t *);
Jan Kara79feb522012-03-13 22:22:54 -04001160extern void jbd2_journal_update_sb_log_tail (journal_t *, tid_t,
1161 unsigned long, int);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001162extern void __jbd2_journal_abort_hard (journal_t *);
1163extern void jbd2_journal_abort (journal_t *, int);
1164extern int jbd2_journal_errno (journal_t *);
1165extern void jbd2_journal_ack_err (journal_t *);
1166extern int jbd2_journal_clear_err (journal_t *);
Mingming Cao18eba7a2006-10-11 01:21:13 -07001167extern int jbd2_journal_bmap(journal_t *, unsigned long, unsigned long long *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001168extern int jbd2_journal_force_commit(journal_t *);
Dmitry Monakhov9ff86442013-06-12 22:24:07 -04001169extern int jbd2_journal_force_commit_nested(journal_t *);
Jan Karac851ed52008-07-11 19:27:31 -04001170extern int jbd2_journal_file_inode(handle_t *handle, struct jbd2_inode *inode);
Jan Kara7f5aa212009-02-10 11:15:34 -05001171extern int jbd2_journal_begin_ordered_truncate(journal_t *journal,
1172 struct jbd2_inode *inode, loff_t new_size);
Jan Karac851ed52008-07-11 19:27:31 -04001173extern void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode);
1174extern void jbd2_journal_release_jbd_inode(journal_t *journal, struct jbd2_inode *jinode);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001175
1176/*
1177 * journal_head management
1178 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001179struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh);
1180struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001181void jbd2_journal_put_journal_head(struct journal_head *jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001182
1183/*
1184 * handle management
1185 */
Christoph Lametere18b8902006-12-06 20:33:20 -08001186extern struct kmem_cache *jbd2_handle_cache;
Dave Kleikamp470decc2006-10-11 01:20:57 -07001187
Mingming Caoaf1e76d2007-10-16 18:38:25 -04001188static inline handle_t *jbd2_alloc_handle(gfp_t gfp_flags)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001189{
Zheng Liu28daf4f2013-04-19 17:49:23 -04001190 return kmem_cache_zalloc(jbd2_handle_cache, gfp_flags);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001191}
1192
Mingming Caoaf1e76d2007-10-16 18:38:25 -04001193static inline void jbd2_free_handle(handle_t *handle)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001194{
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001195 kmem_cache_free(jbd2_handle_cache, handle);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001196}
1197
Theodore Ts'o8aefcd52011-01-10 12:29:43 -05001198/*
1199 * jbd2_inode management (optional, for those file systems that want to use
1200 * dynamically allocated jbd2_inode structures)
1201 */
1202extern struct kmem_cache *jbd2_inode_cache;
1203
1204static inline struct jbd2_inode *jbd2_alloc_inode(gfp_t gfp_flags)
1205{
1206 return kmem_cache_alloc(jbd2_inode_cache, gfp_flags);
1207}
1208
1209static inline void jbd2_free_inode(struct jbd2_inode *jinode)
1210{
1211 kmem_cache_free(jbd2_inode_cache, jinode);
1212}
1213
Dave Kleikamp470decc2006-10-11 01:20:57 -07001214/* Primary revoke support */
1215#define JOURNAL_REVOKE_DEFAULT_HASH 256
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001216extern int jbd2_journal_init_revoke(journal_t *, int);
1217extern void jbd2_journal_destroy_revoke_caches(void);
1218extern int jbd2_journal_init_revoke_caches(void);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001219
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001220extern void jbd2_journal_destroy_revoke(journal_t *);
Mingming Cao18eba7a2006-10-11 01:21:13 -07001221extern int jbd2_journal_revoke (handle_t *, unsigned long long, struct buffer_head *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001222extern int jbd2_journal_cancel_revoke(handle_t *, struct journal_head *);
Jan Karae5a120a2013-06-04 12:06:01 -04001223extern void jbd2_journal_write_revoke_records(journal_t *journal,
1224 transaction_t *transaction,
1225 struct list_head *log_bufs,
1226 int write_op);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001227
1228/* Recovery revoke support */
Mingming Cao18eba7a2006-10-11 01:21:13 -07001229extern int jbd2_journal_set_revoke(journal_t *, unsigned long long, tid_t);
1230extern int jbd2_journal_test_revoke(journal_t *, unsigned long long, tid_t);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001231extern void jbd2_journal_clear_revoke(journal_t *);
1232extern void jbd2_journal_switch_revoke_table(journal_t *journal);
Yongqiang Yang1ba37262011-12-28 17:46:46 -05001233extern void jbd2_clear_buffer_revoked_flags(journal_t *journal);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001234
1235/*
1236 * The log thread user interface:
1237 *
1238 * Request space in the current transaction, and force transaction commit
1239 * transitions on demand.
1240 */
1241
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001242int jbd2_log_start_commit(journal_t *journal, tid_t tid);
1243int __jbd2_log_start_commit(journal_t *journal, tid_t tid);
1244int jbd2_journal_start_commit(journal_t *journal, tid_t *tid);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001245int jbd2_log_wait_commit(journal_t *journal, tid_t tid);
Theodore Ts'od76a3a772013-04-03 22:02:52 -04001246int jbd2_complete_transaction(journal_t *journal, tid_t tid);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001247int jbd2_log_do_checkpoint(journal_t *journal);
Jan Karabbd2be32011-05-24 11:59:18 -04001248int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001249
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001250void __jbd2_log_wait_for_space(journal_t *journal);
Aneesh Kumar K.Vfb684072008-11-06 17:50:21 -05001251extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *);
1252extern int jbd2_cleanup_journal_tail(journal_t *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001253
1254/* Debugging code only: */
1255
1256#define jbd_ENOSYS() \
1257do { \
Harvey Harrisond5c003b2008-10-15 22:01:24 -07001258 printk (KERN_ERR "JBD unimplemented function %s\n", __func__); \
Dave Kleikamp470decc2006-10-11 01:20:57 -07001259 current->state = TASK_UNINTERRUPTIBLE; \
1260 schedule(); \
1261} while (1)
1262
1263/*
1264 * is_journal_abort
1265 *
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001266 * Simple test wrapper function to test the JBD2_ABORT state flag. This
Dave Kleikamp470decc2006-10-11 01:20:57 -07001267 * bit, when set, indicates that we have had a fatal error somewhere,
1268 * either inside the journaling layer or indicated to us by the client
1269 * (eg. ext3), and that we and should not commit any further
1270 * transactions.
1271 */
1272
1273static inline int is_journal_aborted(journal_t *journal)
1274{
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001275 return journal->j_flags & JBD2_ABORT;
Dave Kleikamp470decc2006-10-11 01:20:57 -07001276}
1277
1278static inline int is_handle_aborted(handle_t *handle)
1279{
Theodore Ts'o41a5b912013-07-01 08:12:41 -04001280 if (handle->h_aborted || !handle->h_transaction)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001281 return 1;
1282 return is_journal_aborted(handle->h_transaction->t_journal);
1283}
1284
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001285static inline void jbd2_journal_abort_handle(handle_t *handle)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001286{
1287 handle->h_aborted = 1;
1288}
1289
1290#endif /* __KERNEL__ */
1291
1292/* Comparison functions for transaction IDs: perform comparisons using
1293 * modulo arithmetic so that they work over sequence number wraps. */
1294
1295static inline int tid_gt(tid_t x, tid_t y)
1296{
1297 int difference = (x - y);
1298 return (difference > 0);
1299}
1300
1301static inline int tid_geq(tid_t x, tid_t y)
1302{
1303 int difference = (x - y);
1304 return (difference >= 0);
1305}
1306
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001307extern int jbd2_journal_blocks_per_page(struct inode *inode);
Zach Brownb517bea2006-10-11 01:21:08 -07001308extern size_t journal_tag_bytes(journal_t *journal);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001309
Darrick J. Wongdb9ee222014-08-27 18:40:07 -04001310static inline int jbd2_journal_has_csum_v2or3(journal_t *journal)
1311{
1312 if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2) ||
1313 JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V3))
1314 return 1;
1315
1316 return 0;
1317}
1318
Dave Kleikamp470decc2006-10-11 01:20:57 -07001319/*
Jan Kara76c39902013-06-04 12:12:57 -04001320 * We reserve t_outstanding_credits >> JBD2_CONTROL_BLOCKS_SHIFT for
1321 * transaction control blocks.
1322 */
1323#define JBD2_CONTROL_BLOCKS_SHIFT 5
1324
1325/*
Dave Kleikamp470decc2006-10-11 01:20:57 -07001326 * Return the minimum number of blocks which must be free in the journal
1327 * before a new transaction may be started. Must be called under j_state_lock.
1328 */
Jan Kara76c39902013-06-04 12:12:57 -04001329static inline int jbd2_space_needed(journal_t *journal)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001330{
1331 int nblocks = journal->j_max_transaction_buffers;
Jan Kara76c39902013-06-04 12:12:57 -04001332 return nblocks + (nblocks >> JBD2_CONTROL_BLOCKS_SHIFT);
1333}
1334
1335/*
1336 * Return number of free blocks in the log. Must be called under j_state_lock.
1337 */
1338static inline unsigned long jbd2_log_space_left(journal_t *journal)
1339{
1340 /* Allow for rounding errors */
1341 unsigned long free = journal->j_free - 32;
1342
1343 if (journal->j_committing_transaction) {
1344 unsigned long committing = atomic_read(&journal->
1345 j_committing_transaction->t_outstanding_credits);
1346
1347 /* Transaction + control blocks */
1348 free -= committing + (committing >> JBD2_CONTROL_BLOCKS_SHIFT);
1349 }
1350 return free;
Dave Kleikamp470decc2006-10-11 01:20:57 -07001351}
1352
1353/*
1354 * Definitions which augment the buffer_head layer
1355 */
1356
1357/* journaling buffer types */
1358#define BJ_None 0 /* Not journaled */
Jan Kara87c89c22008-07-11 19:27:31 -04001359#define BJ_Metadata 1 /* Normal journaled metadata */
1360#define BJ_Forget 2 /* Buffer superseded by this transaction */
Jan Karaf5113ef2013-06-04 12:01:45 -04001361#define BJ_Shadow 3 /* Buffer contents being shadowed to the log */
Jan Karae5a120a2013-06-04 12:06:01 -04001362#define BJ_Reserved 4 /* Buffer is reserved for access by journal */
1363#define BJ_Types 5
Dave Kleikamp470decc2006-10-11 01:20:57 -07001364
1365extern int jbd_blocks_per_page(struct inode *inode);
1366
Behan Websterfd47d3e2012-11-08 11:24:46 -05001367/* JBD uses a CRC32 checksum */
1368#define JBD_MAX_CHECKSUM_SIZE 4
1369
Darrick J. Wong01b5adc2012-05-27 07:50:56 -04001370static inline u32 jbd2_chksum(journal_t *journal, u32 crc,
1371 const void *address, unsigned int length)
1372{
1373 struct {
1374 struct shash_desc shash;
Behan Websterfd47d3e2012-11-08 11:24:46 -05001375 char ctx[JBD_MAX_CHECKSUM_SIZE];
Darrick J. Wong01b5adc2012-05-27 07:50:56 -04001376 } desc;
1377 int err;
1378
Behan Websterfd47d3e2012-11-08 11:24:46 -05001379 BUG_ON(crypto_shash_descsize(journal->j_chksum_driver) >
1380 JBD_MAX_CHECKSUM_SIZE);
1381
Darrick J. Wong01b5adc2012-05-27 07:50:56 -04001382 desc.shash.tfm = journal->j_chksum_driver;
1383 desc.shash.flags = 0;
1384 *(u32 *)desc.ctx = crc;
1385
1386 err = crypto_shash_update(&desc.shash, address, length);
1387 BUG_ON(err);
1388
1389 return *(u32 *)desc.ctx;
1390}
1391
Dmitry Monakhov06a407f2013-06-12 22:25:07 -04001392/* Return most recent uncommitted transaction */
1393static inline tid_t jbd2_get_latest_transaction(journal_t *journal)
1394{
1395 tid_t tid;
1396
1397 read_lock(&journal->j_state_lock);
1398 tid = journal->j_commit_request;
1399 if (journal->j_running_transaction)
1400 tid = journal->j_running_transaction->t_tid;
1401 read_unlock(&journal->j_state_lock);
1402 return tid;
1403}
1404
Dave Kleikamp470decc2006-10-11 01:20:57 -07001405#ifdef __KERNEL__
1406
1407#define buffer_trace_init(bh) do {} while (0)
1408#define print_buffer_fields(bh) do {} while (0)
1409#define print_buffer_trace(bh) do {} while (0)
1410#define BUFFER_TRACE(bh, info) do {} while (0)
1411#define BUFFER_TRACE2(bh, bh2, info) do {} while (0)
1412#define JBUFFER_TRACE(jh, info) do {} while (0)
1413
1414#endif /* __KERNEL__ */
1415
Mingming Caocd02ff02007-10-16 18:38:25 -04001416#endif /* _LINUX_JBD2_H */