1d6910058SThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-or-later */
2470decc6SDave Kleikamp /*
3f7f4bccbSMingming Cao * linux/include/linux/jbd2.h
4470decc6SDave Kleikamp *
5470decc6SDave Kleikamp * Written by Stephen C. Tweedie <sct@redhat.com>
6470decc6SDave Kleikamp *
7470decc6SDave Kleikamp * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved
8470decc6SDave Kleikamp *
9470decc6SDave Kleikamp * Definitions for transaction data structures for the buffer cache
10470decc6SDave Kleikamp * filesystem journaling support.
11470decc6SDave Kleikamp */
12470decc6SDave Kleikamp
13cd02ff0bSMingming Cao #ifndef _LINUX_JBD2_H
14cd02ff0bSMingming Cao #define _LINUX_JBD2_H
15470decc6SDave Kleikamp
16470decc6SDave Kleikamp /* Allow this file to be included directly into e2fsprogs */
17470decc6SDave Kleikamp #ifndef __KERNEL__
18470decc6SDave Kleikamp #include "jfs_compat.h"
19f7f4bccbSMingming Cao #define JBD2_DEBUG
20470decc6SDave Kleikamp #else
21470decc6SDave Kleikamp
22470decc6SDave Kleikamp #include <linux/types.h>
23470decc6SDave Kleikamp #include <linux/buffer_head.h>
24470decc6SDave Kleikamp #include <linux/journal-head.h>
25470decc6SDave Kleikamp #include <linux/stddef.h>
26470decc6SDave Kleikamp #include <linux/mutex.h>
27470decc6SDave Kleikamp #include <linux/timer.h>
285a0e3ad6STejun Heo #include <linux/slab.h>
29c290ea01SJan Kara #include <linux/bit_spinlock.h>
303f1266f1SChristoph Hellwig #include <linux/blkdev.h>
3101b5adceSDarrick J. Wong #include <crypto/hash.h>
32470decc6SDave Kleikamp #endif
33470decc6SDave Kleikamp
34470decc6SDave Kleikamp #define journal_oom_retry 1
35470decc6SDave Kleikamp
36470decc6SDave Kleikamp /*
37cd02ff0bSMingming Cao * Define JBD2_PARANIOD_IOFAIL to cause a kernel BUG() if ext4 finds
38470decc6SDave Kleikamp * certain classes of error which can occur due to failed IOs. Under
39cd02ff0bSMingming Cao * normal use we want ext4 to continue after such errors, because
40470decc6SDave Kleikamp * hardware _can_ fail, but for debugging purposes when running tests on
41470decc6SDave Kleikamp * known-good hardware we may want to trap these errors.
42470decc6SDave Kleikamp */
43cd02ff0bSMingming Cao #undef JBD2_PARANOID_IOFAIL
44470decc6SDave Kleikamp
45470decc6SDave Kleikamp /*
46470decc6SDave Kleikamp * The default maximum commit age, in seconds.
47470decc6SDave Kleikamp */
48cd02ff0bSMingming Cao #define JBD2_DEFAULT_MAX_COMMIT_AGE 5
49470decc6SDave Kleikamp
50e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG
51470decc6SDave Kleikamp /*
52cd02ff0bSMingming Cao * Define JBD2_EXPENSIVE_CHECKING to enable more expensive internal
53470decc6SDave Kleikamp * consistency checks. By default we don't do this unless
54e23291b9SJose R. Santos * CONFIG_JBD2_DEBUG is on.
55470decc6SDave Kleikamp */
56cd02ff0bSMingming Cao #define JBD2_EXPENSIVE_CHECKING
57169f1a2aSPaul Gortmaker void __jbd2_debug(int level, const char *file, const char *func,
58169f1a2aSPaul Gortmaker unsigned int line, const char *fmt, ...);
59470decc6SDave Kleikamp
60cb3b3bf2SJan Kara #define jbd2_debug(n, fmt, a...) \
61169f1a2aSPaul Gortmaker __jbd2_debug((n), __FILE__, __func__, __LINE__, (fmt), ##a)
62470decc6SDave Kleikamp #else
63cb3b3bf2SJan Kara #define jbd2_debug(n, fmt, a...) no_printk(fmt, ##a)
64470decc6SDave Kleikamp #endif
65470decc6SDave Kleikamp
66d2eecb03STheodore Ts'o extern void *jbd2_alloc(size_t size, gfp_t flags);
67d2eecb03STheodore Ts'o extern void jbd2_free(void *ptr, size_t size);
68af1e76d6SMingming Cao
69f7f4bccbSMingming Cao #define JBD2_MIN_JOURNAL_BLOCKS 1024
709bd23c31SHarshad Shirwadkar #define JBD2_DEFAULT_FAST_COMMIT_BLOCKS 256
71470decc6SDave Kleikamp
72470decc6SDave Kleikamp #ifdef __KERNEL__
73470decc6SDave Kleikamp
74470decc6SDave Kleikamp /**
75470decc6SDave Kleikamp * typedef handle_t - The handle_t type represents a single atomic update being performed by some process.
76470decc6SDave Kleikamp *
77470decc6SDave Kleikamp * All filesystem modifications made by the process go
78470decc6SDave Kleikamp * through this handle. Recursive operations (such as quota operations)
79470decc6SDave Kleikamp * are gathered into a single update.
80470decc6SDave Kleikamp *
81470decc6SDave Kleikamp * The buffer credits field is used to account for journaled buffers
82470decc6SDave Kleikamp * being modified by the running process. To ensure that there is
83470decc6SDave Kleikamp * enough log space for all outstanding operations, we need to limit the
84470decc6SDave Kleikamp * number of outstanding buffers possible at any time. When the
85470decc6SDave Kleikamp * operation completes, any buffer credits not used are credited back to
86470decc6SDave Kleikamp * the transaction, so that at all times we know how many buffers the
87470decc6SDave Kleikamp * outstanding updates on a transaction might possibly touch.
88470decc6SDave Kleikamp *
89470decc6SDave Kleikamp * This is an opaque datatype.
90470decc6SDave Kleikamp **/
918aefcd55STheodore Ts'o typedef struct jbd2_journal_handle handle_t; /* Atomic operation type */
92470decc6SDave Kleikamp
93470decc6SDave Kleikamp
94470decc6SDave Kleikamp /**
95470decc6SDave Kleikamp * typedef journal_t - The journal_t maintains all of the journaling state information for a single filesystem.
96470decc6SDave Kleikamp *
97470decc6SDave Kleikamp * journal_t is linked to from the fs superblock structure.
98470decc6SDave Kleikamp *
99470decc6SDave Kleikamp * We use the journal_t to keep track of all outstanding transaction
100470decc6SDave Kleikamp * activity on the filesystem, and to manage the state of the log
101470decc6SDave Kleikamp * writing process.
102470decc6SDave Kleikamp *
103470decc6SDave Kleikamp * This is an opaque datatype.
104470decc6SDave Kleikamp **/
105470decc6SDave Kleikamp typedef struct journal_s journal_t; /* Journal control structure */
106470decc6SDave Kleikamp #endif
107470decc6SDave Kleikamp
108470decc6SDave Kleikamp /*
109470decc6SDave Kleikamp * Internal structures used by the logging mechanism:
110470decc6SDave Kleikamp */
111470decc6SDave Kleikamp
112f7f4bccbSMingming Cao #define JBD2_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */
113470decc6SDave Kleikamp
114470decc6SDave Kleikamp /*
115470decc6SDave Kleikamp * On-disk structures
116470decc6SDave Kleikamp */
117470decc6SDave Kleikamp
118470decc6SDave Kleikamp /*
119470decc6SDave Kleikamp * Descriptor block types:
120470decc6SDave Kleikamp */
121470decc6SDave Kleikamp
122f7f4bccbSMingming Cao #define JBD2_DESCRIPTOR_BLOCK 1
123f7f4bccbSMingming Cao #define JBD2_COMMIT_BLOCK 2
124f7f4bccbSMingming Cao #define JBD2_SUPERBLOCK_V1 3
125f7f4bccbSMingming Cao #define JBD2_SUPERBLOCK_V2 4
126f7f4bccbSMingming Cao #define JBD2_REVOKE_BLOCK 5
127470decc6SDave Kleikamp
128470decc6SDave Kleikamp /*
129470decc6SDave Kleikamp * Standard header for all descriptor blocks:
130470decc6SDave Kleikamp */
131470decc6SDave Kleikamp typedef struct journal_header_s
132470decc6SDave Kleikamp {
133470decc6SDave Kleikamp __be32 h_magic;
134470decc6SDave Kleikamp __be32 h_blocktype;
135470decc6SDave Kleikamp __be32 h_sequence;
136470decc6SDave Kleikamp } journal_header_t;
137470decc6SDave Kleikamp
138818d276cSGirish Shilamkar /*
139818d276cSGirish Shilamkar * Checksum types.
140818d276cSGirish Shilamkar */
141818d276cSGirish Shilamkar #define JBD2_CRC32_CHKSUM 1
142818d276cSGirish Shilamkar #define JBD2_MD5_CHKSUM 2
143818d276cSGirish Shilamkar #define JBD2_SHA1_CHKSUM 3
1448f888ef8SDarrick J. Wong #define JBD2_CRC32C_CHKSUM 4
145818d276cSGirish Shilamkar
146818d276cSGirish Shilamkar #define JBD2_CRC32_CHKSUM_SIZE 4
147818d276cSGirish Shilamkar
148818d276cSGirish Shilamkar #define JBD2_CHECKSUM_BYTES (32 / sizeof(u32))
149818d276cSGirish Shilamkar /*
150818d276cSGirish Shilamkar * Commit block header for storing transactional checksums:
1518f888ef8SDarrick J. Wong *
1528f888ef8SDarrick J. Wong * NOTE: If FEATURE_COMPAT_CHECKSUM (checksum v1) is set, the h_chksum*
1538f888ef8SDarrick J. Wong * fields are used to store a checksum of the descriptor and data blocks.
1548f888ef8SDarrick J. Wong *
1558f888ef8SDarrick J. Wong * If FEATURE_INCOMPAT_CSUM_V2 (checksum v2) is set, then the h_chksum
1568f888ef8SDarrick J. Wong * field is used to store crc32c(uuid+commit_block). Each journal metadata
1578f888ef8SDarrick J. Wong * block gets its own checksum, and data block checksums are stored in
1588f888ef8SDarrick J. Wong * journal_block_tag (in the descriptor). The other h_chksum* fields are
1598f888ef8SDarrick J. Wong * not used.
1608f888ef8SDarrick J. Wong *
161db9ee220SDarrick J. Wong * If FEATURE_INCOMPAT_CSUM_V3 is set, the descriptor block uses
162db9ee220SDarrick J. Wong * journal_block_tag3_t to store a full 32-bit checksum. Everything else
163db9ee220SDarrick J. Wong * is the same as v2.
164db9ee220SDarrick J. Wong *
165db9ee220SDarrick J. Wong * Checksum v1, v2, and v3 are mutually exclusive features.
166818d276cSGirish Shilamkar */
167818d276cSGirish Shilamkar struct commit_header {
168818d276cSGirish Shilamkar __be32 h_magic;
169818d276cSGirish Shilamkar __be32 h_blocktype;
170818d276cSGirish Shilamkar __be32 h_sequence;
171818d276cSGirish Shilamkar unsigned char h_chksum_type;
172818d276cSGirish Shilamkar unsigned char h_chksum_size;
173818d276cSGirish Shilamkar unsigned char h_padding[2];
174818d276cSGirish Shilamkar __be32 h_chksum[JBD2_CHECKSUM_BYTES];
175736603abSTheodore Ts'o __be64 h_commit_sec;
176736603abSTheodore Ts'o __be32 h_commit_nsec;
177818d276cSGirish Shilamkar };
178470decc6SDave Kleikamp
179470decc6SDave Kleikamp /*
180b517bea1SZach Brown * The block tag: used to describe a single buffer in the journal.
181b517bea1SZach Brown * t_blocknr_high is only used if INCOMPAT_64BIT is set, so this
182b517bea1SZach Brown * raw struct shouldn't be used for pointer math or sizeof() - use
183b517bea1SZach Brown * journal_tag_bytes(journal) instead to compute this.
184470decc6SDave Kleikamp */
185db9ee220SDarrick J. Wong typedef struct journal_block_tag3_s
186db9ee220SDarrick J. Wong {
187db9ee220SDarrick J. Wong __be32 t_blocknr; /* The on-disk block number */
188db9ee220SDarrick J. Wong __be32 t_flags; /* See below */
189db9ee220SDarrick J. Wong __be32 t_blocknr_high; /* most-significant high 32bits. */
190db9ee220SDarrick J. Wong __be32 t_checksum; /* crc32c(uuid+seq+block) */
191db9ee220SDarrick J. Wong } journal_block_tag3_t;
192db9ee220SDarrick J. Wong
193470decc6SDave Kleikamp typedef struct journal_block_tag_s
194470decc6SDave Kleikamp {
195470decc6SDave Kleikamp __be32 t_blocknr; /* The on-disk block number */
1968f888ef8SDarrick J. Wong __be16 t_checksum; /* truncated crc32c(uuid+seq+block) */
1978f888ef8SDarrick J. Wong __be16 t_flags; /* See below */
198b517bea1SZach Brown __be32 t_blocknr_high; /* most-significant high 32bits. */
199470decc6SDave Kleikamp } journal_block_tag_t;
200470decc6SDave Kleikamp
2011101cd4dSJan Kara /* Tail of descriptor or revoke block, for checksumming */
2028f888ef8SDarrick J. Wong struct jbd2_journal_block_tail {
2038f888ef8SDarrick J. Wong __be32 t_checksum; /* crc32c(uuid+descr_block) */
2048f888ef8SDarrick J. Wong };
2058f888ef8SDarrick J. Wong
206470decc6SDave Kleikamp /*
207470decc6SDave Kleikamp * The revoke descriptor: used on disk to describe a series of blocks to
208470decc6SDave Kleikamp * be revoked from the log
209470decc6SDave Kleikamp */
210f7f4bccbSMingming Cao typedef struct jbd2_journal_revoke_header_s
211470decc6SDave Kleikamp {
212470decc6SDave Kleikamp journal_header_t r_header;
213470decc6SDave Kleikamp __be32 r_count; /* Count of bytes used in the block */
214f7f4bccbSMingming Cao } jbd2_journal_revoke_header_t;
215470decc6SDave Kleikamp
216470decc6SDave Kleikamp /* Definitions for the journal tag flags word: */
217f7f4bccbSMingming Cao #define JBD2_FLAG_ESCAPE 1 /* on-disk block is escaped */
218f7f4bccbSMingming Cao #define JBD2_FLAG_SAME_UUID 2 /* block has same uuid as previous */
219f7f4bccbSMingming Cao #define JBD2_FLAG_DELETED 4 /* block deleted by this transaction */
220f7f4bccbSMingming Cao #define JBD2_FLAG_LAST_TAG 8 /* last tag in this descriptor block */
221470decc6SDave Kleikamp
222470decc6SDave Kleikamp
223470decc6SDave Kleikamp /*
224470decc6SDave Kleikamp * The journal superblock. All fields are in big-endian byte order.
225470decc6SDave Kleikamp */
226470decc6SDave Kleikamp typedef struct journal_superblock_s
227470decc6SDave Kleikamp {
228470decc6SDave Kleikamp /* 0x0000 */
229470decc6SDave Kleikamp journal_header_t s_header;
230470decc6SDave Kleikamp
231470decc6SDave Kleikamp /* 0x000C */
232470decc6SDave Kleikamp /* Static information describing the journal */
233470decc6SDave Kleikamp __be32 s_blocksize; /* journal device blocksize */
234470decc6SDave Kleikamp __be32 s_maxlen; /* total blocks in journal file */
235470decc6SDave Kleikamp __be32 s_first; /* first block of log information */
236470decc6SDave Kleikamp
237470decc6SDave Kleikamp /* 0x0018 */
238470decc6SDave Kleikamp /* Dynamic information describing the current state of the log */
239470decc6SDave Kleikamp __be32 s_sequence; /* first commit ID expected in log */
240470decc6SDave Kleikamp __be32 s_start; /* blocknr of start of log */
241470decc6SDave Kleikamp
242470decc6SDave Kleikamp /* 0x0020 */
243f7f4bccbSMingming Cao /* Error value, as set by jbd2_journal_abort(). */
244470decc6SDave Kleikamp __be32 s_errno;
245470decc6SDave Kleikamp
246470decc6SDave Kleikamp /* 0x0024 */
247470decc6SDave Kleikamp /* Remaining fields are only valid in a version-2 superblock */
248470decc6SDave Kleikamp __be32 s_feature_compat; /* compatible feature set */
249470decc6SDave Kleikamp __be32 s_feature_incompat; /* incompatible feature set */
250470decc6SDave Kleikamp __be32 s_feature_ro_compat; /* readonly-compatible feature set */
251470decc6SDave Kleikamp /* 0x0030 */
252470decc6SDave Kleikamp __u8 s_uuid[16]; /* 128-bit uuid for journal */
253470decc6SDave Kleikamp
254470decc6SDave Kleikamp /* 0x0040 */
255470decc6SDave Kleikamp __be32 s_nr_users; /* Nr of filesystems sharing log */
256470decc6SDave Kleikamp
257470decc6SDave Kleikamp __be32 s_dynsuper; /* Blocknr of dynamic superblock copy*/
258470decc6SDave Kleikamp
259470decc6SDave Kleikamp /* 0x0048 */
260470decc6SDave Kleikamp __be32 s_max_transaction; /* Limit of journal blocks per trans.*/
261470decc6SDave Kleikamp __be32 s_max_trans_data; /* Limit of data blocks per trans. */
262470decc6SDave Kleikamp
263470decc6SDave Kleikamp /* 0x0050 */
2648f888ef8SDarrick J. Wong __u8 s_checksum_type; /* checksum type */
2658f888ef8SDarrick J. Wong __u8 s_padding2[3];
266e029c5f2SHarshad Shirwadkar /* 0x0054 */
267e029c5f2SHarshad Shirwadkar __be32 s_num_fc_blks; /* Number of fast commit blocks */
268c7fc6055SZhang Yi __be32 s_head; /* blocknr of head of log, only uptodate
269c7fc6055SZhang Yi * while the filesystem is clean */
270c7fc6055SZhang Yi /* 0x005C */
271c7fc6055SZhang Yi __u32 s_padding[40];
2728f888ef8SDarrick J. Wong __be32 s_checksum; /* crc32c(superblock) */
273470decc6SDave Kleikamp
274470decc6SDave Kleikamp /* 0x0100 */
275470decc6SDave Kleikamp __u8 s_users[16*48]; /* ids of all fs'es sharing the log */
276470decc6SDave Kleikamp /* 0x0400 */
277470decc6SDave Kleikamp } journal_superblock_t;
278470decc6SDave Kleikamp
279818d276cSGirish Shilamkar #define JBD2_FEATURE_COMPAT_CHECKSUM 0x00000001
280818d276cSGirish Shilamkar
281f7f4bccbSMingming Cao #define JBD2_FEATURE_INCOMPAT_REVOKE 0x00000001
282b517bea1SZach Brown #define JBD2_FEATURE_INCOMPAT_64BIT 0x00000002
283818d276cSGirish Shilamkar #define JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT 0x00000004
2848f888ef8SDarrick J. Wong #define JBD2_FEATURE_INCOMPAT_CSUM_V2 0x00000008
285db9ee220SDarrick J. Wong #define JBD2_FEATURE_INCOMPAT_CSUM_V3 0x00000010
286995a3ed6SHarshad Shirwadkar #define JBD2_FEATURE_INCOMPAT_FAST_COMMIT 0x00000020
287470decc6SDave Kleikamp
28856316a0dSDarrick J. Wong /* See "journal feature predicate functions" below */
28956316a0dSDarrick J. Wong
290470decc6SDave Kleikamp /* Features known to this kernel version: */
291818d276cSGirish Shilamkar #define JBD2_KNOWN_COMPAT_FEATURES JBD2_FEATURE_COMPAT_CHECKSUM
292f7f4bccbSMingming Cao #define JBD2_KNOWN_ROCOMPAT_FEATURES 0
293b517bea1SZach Brown #define JBD2_KNOWN_INCOMPAT_FEATURES (JBD2_FEATURE_INCOMPAT_REVOKE | \
294818d276cSGirish Shilamkar JBD2_FEATURE_INCOMPAT_64BIT | \
295e93376c2SDarrick J. Wong JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | \
296db9ee220SDarrick J. Wong JBD2_FEATURE_INCOMPAT_CSUM_V2 | \
297995a3ed6SHarshad Shirwadkar JBD2_FEATURE_INCOMPAT_CSUM_V3 | \
298995a3ed6SHarshad Shirwadkar JBD2_FEATURE_INCOMPAT_FAST_COMMIT)
299470decc6SDave Kleikamp
300470decc6SDave Kleikamp #ifdef __KERNEL__
301470decc6SDave Kleikamp
302470decc6SDave Kleikamp #include <linux/fs.h>
303470decc6SDave Kleikamp #include <linux/sched.h>
304b34090e5SJan Kara
305b34090e5SJan Kara enum jbd_state_bits {
306b34090e5SJan Kara BH_JBD /* Has an attached ext3 journal_head */
307b34090e5SJan Kara = BH_PrivateStart,
308b34090e5SJan Kara BH_JWrite, /* Being written to log (@@@ DEBUGGING) */
309b34090e5SJan Kara BH_Freed, /* Has been freed (truncated) */
310b34090e5SJan Kara BH_Revoked, /* Has been revoked from the log */
311b34090e5SJan Kara BH_RevokeValid, /* Revoked flag is valid */
312b34090e5SJan Kara BH_JBDDirty, /* Is dirty but journaled */
313b34090e5SJan Kara BH_JournalHead, /* Pins bh->b_private and jh->b_bh */
314b34090e5SJan Kara BH_Shadow, /* IO on shadow buffer is running */
315b34090e5SJan Kara BH_Verified, /* Metadata block has been verified ok */
316b34090e5SJan Kara BH_JBDPrivateStart, /* First bit available for private use by FS */
317b34090e5SJan Kara };
318b34090e5SJan Kara
BUFFER_FNS(JBD,jbd)319b34090e5SJan Kara BUFFER_FNS(JBD, jbd)
320b34090e5SJan Kara BUFFER_FNS(JWrite, jwrite)
321b34090e5SJan Kara BUFFER_FNS(JBDDirty, jbddirty)
322b34090e5SJan Kara TAS_BUFFER_FNS(JBDDirty, jbddirty)
323b34090e5SJan Kara BUFFER_FNS(Revoked, revoked)
324b34090e5SJan Kara TAS_BUFFER_FNS(Revoked, revoked)
325b34090e5SJan Kara BUFFER_FNS(RevokeValid, revokevalid)
326b34090e5SJan Kara TAS_BUFFER_FNS(RevokeValid, revokevalid)
327b34090e5SJan Kara BUFFER_FNS(Freed, freed)
328b34090e5SJan Kara BUFFER_FNS(Shadow, shadow)
329b34090e5SJan Kara BUFFER_FNS(Verified, verified)
330b34090e5SJan Kara
331c290ea01SJan Kara static inline struct buffer_head *jh2bh(struct journal_head *jh)
332c290ea01SJan Kara {
333c290ea01SJan Kara return jh->b_bh;
334c290ea01SJan Kara }
335c290ea01SJan Kara
bh2jh(struct buffer_head * bh)336c290ea01SJan Kara static inline struct journal_head *bh2jh(struct buffer_head *bh)
337c290ea01SJan Kara {
338c290ea01SJan Kara return bh->b_private;
339c290ea01SJan Kara }
340c290ea01SJan Kara
jbd_lock_bh_journal_head(struct buffer_head * bh)341c290ea01SJan Kara static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
342c290ea01SJan Kara {
343c290ea01SJan Kara bit_spin_lock(BH_JournalHead, &bh->b_state);
344c290ea01SJan Kara }
345c290ea01SJan Kara
jbd_unlock_bh_journal_head(struct buffer_head * bh)346c290ea01SJan Kara static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
347c290ea01SJan Kara {
348c290ea01SJan Kara bit_spin_unlock(BH_JournalHead, &bh->b_state);
349c290ea01SJan Kara }
350470decc6SDave Kleikamp
35136df53f4SChris Snook #define J_ASSERT(assert) BUG_ON(!(assert))
352470decc6SDave Kleikamp
353470decc6SDave Kleikamp #define J_ASSERT_BH(bh, expr) J_ASSERT(expr)
354470decc6SDave Kleikamp #define J_ASSERT_JH(jh, expr) J_ASSERT(expr)
355470decc6SDave Kleikamp
356cd02ff0bSMingming Cao #if defined(JBD2_PARANOID_IOFAIL)
357470decc6SDave Kleikamp #define J_EXPECT(expr, why...) J_ASSERT(expr)
358470decc6SDave Kleikamp #define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr)
359470decc6SDave Kleikamp #define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr)
360470decc6SDave Kleikamp #else
361470decc6SDave Kleikamp #define __journal_expect(expr, why...) \
362470decc6SDave Kleikamp ({ \
363470decc6SDave Kleikamp int val = (expr); \
364470decc6SDave Kleikamp if (!val) { \
365470decc6SDave Kleikamp printk(KERN_ERR \
36608ec8c38STheodore Ts'o "JBD2 unexpected failure: %s: %s;\n", \
36708ec8c38STheodore Ts'o __func__, #expr); \
368470decc6SDave Kleikamp printk(KERN_ERR why "\n"); \
369470decc6SDave Kleikamp } \
370470decc6SDave Kleikamp val; \
371470decc6SDave Kleikamp })
372470decc6SDave Kleikamp #define J_EXPECT(expr, why...) __journal_expect(expr, ## why)
373470decc6SDave Kleikamp #define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why)
374470decc6SDave Kleikamp #define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why)
375470decc6SDave Kleikamp #endif
376470decc6SDave Kleikamp
377c851ed54SJan Kara /* Flags in jbd_inode->i_flags */
378c851ed54SJan Kara #define __JI_COMMIT_RUNNING 0
37941617e1aSJan Kara #define __JI_WRITE_DATA 1
38041617e1aSJan Kara #define __JI_WAIT_DATA 2
38141617e1aSJan Kara
38241617e1aSJan Kara /*
38341617e1aSJan Kara * Commit of the inode data in progress. We use this flag to protect us from
384c851ed54SJan Kara * concurrent deletion of inode. We cannot use reference to inode for this
385c851ed54SJan Kara * since we cannot afford doing last iput() on behalf of kjournald
386c851ed54SJan Kara */
387c851ed54SJan Kara #define JI_COMMIT_RUNNING (1 << __JI_COMMIT_RUNNING)
38841617e1aSJan Kara /* Write allocated dirty buffers in this inode before commit */
38941617e1aSJan Kara #define JI_WRITE_DATA (1 << __JI_WRITE_DATA)
39041617e1aSJan Kara /* Wait for outstanding data writes for this inode before commit */
39141617e1aSJan Kara #define JI_WAIT_DATA (1 << __JI_WAIT_DATA)
392c851ed54SJan Kara
393c851ed54SJan Kara /**
3942bf31d94SMauro Carvalho Chehab * struct jbd2_inode - The jbd_inode type is the structure linking inodes in
395f69120ceSTobin C. Harding * ordered mode present in a transaction so that we can sync them during commit.
396c851ed54SJan Kara */
397c851ed54SJan Kara struct jbd2_inode {
398f69120ceSTobin C. Harding /**
399f69120ceSTobin C. Harding * @i_transaction:
400f69120ceSTobin C. Harding *
401f69120ceSTobin C. Harding * Which transaction does this inode belong to? Either the running
402f69120ceSTobin C. Harding * transaction or the committing one. [j_list_lock]
403f69120ceSTobin C. Harding */
404c851ed54SJan Kara transaction_t *i_transaction;
405c851ed54SJan Kara
406f69120ceSTobin C. Harding /**
407f69120ceSTobin C. Harding * @i_next_transaction:
408f69120ceSTobin C. Harding *
409f69120ceSTobin C. Harding * Pointer to the running transaction modifying inode's data in case
410f69120ceSTobin C. Harding * there is already a committing transaction touching it. [j_list_lock]
411f69120ceSTobin C. Harding */
412c851ed54SJan Kara transaction_t *i_next_transaction;
413c851ed54SJan Kara
414f69120ceSTobin C. Harding /**
415f69120ceSTobin C. Harding * @i_list: List of inodes in the i_transaction [j_list_lock]
416f69120ceSTobin C. Harding */
417c851ed54SJan Kara struct list_head i_list;
418c851ed54SJan Kara
419f69120ceSTobin C. Harding /**
420f69120ceSTobin C. Harding * @i_vfs_inode:
421f69120ceSTobin C. Harding *
422f69120ceSTobin C. Harding * VFS inode this inode belongs to [constant for lifetime of structure]
423f69120ceSTobin C. Harding */
424c851ed54SJan Kara struct inode *i_vfs_inode;
425c851ed54SJan Kara
426f69120ceSTobin C. Harding /**
427f69120ceSTobin C. Harding * @i_flags: Flags of inode [j_list_lock]
428f69120ceSTobin C. Harding */
42939e3ac25SBrian King unsigned long i_flags;
4306ba0e7dcSRoss Zwisler
4316ba0e7dcSRoss Zwisler /**
4326ba0e7dcSRoss Zwisler * @i_dirty_start:
4336ba0e7dcSRoss Zwisler *
4346ba0e7dcSRoss Zwisler * Offset in bytes where the dirty range for this inode starts.
4356ba0e7dcSRoss Zwisler * [j_list_lock]
4366ba0e7dcSRoss Zwisler */
4376ba0e7dcSRoss Zwisler loff_t i_dirty_start;
4386ba0e7dcSRoss Zwisler
4396ba0e7dcSRoss Zwisler /**
4406ba0e7dcSRoss Zwisler * @i_dirty_end:
4416ba0e7dcSRoss Zwisler *
4426ba0e7dcSRoss Zwisler * Inclusive offset in bytes where the dirty range for this inode
4436ba0e7dcSRoss Zwisler * ends. [j_list_lock]
4446ba0e7dcSRoss Zwisler */
4456ba0e7dcSRoss Zwisler loff_t i_dirty_end;
446c851ed54SJan Kara };
447c851ed54SJan Kara
448f7f4bccbSMingming Cao struct jbd2_revoke_table_s;
449470decc6SDave Kleikamp
450470decc6SDave Kleikamp /**
45115a119e0SHui Su * struct jbd2_journal_handle - The jbd2_journal_handle type is the concrete
45215a119e0SHui Su * type associated with handle_t.
453470decc6SDave Kleikamp * @h_transaction: Which compound transaction is this update a part of?
454f69120ceSTobin C. Harding * @h_journal: Which journal handle belongs to - used iff h_reserved set.
455f69120ceSTobin C. Harding * @h_rsv_handle: Handle reserved for finishing the logical operation.
456933f1c1eSJan Kara * @h_total_credits: Number of remaining buffers we are allowed to add to
457d82d47d5SRandy Dunlap * journal. These are dirty buffers and revoke descriptor blocks.
458fdc3ef88SJan Kara * @h_revoke_credits: Number of remaining revoke records available for handle
459f69120ceSTobin C. Harding * @h_ref: Reference count on this handle.
460f69120ceSTobin C. Harding * @h_err: Field for caller's use to track errors through large fs operations.
461f69120ceSTobin C. Harding * @h_sync: Flag for sync-on-close.
462f69120ceSTobin C. Harding * @h_jdata: Flag to force data journaling.
463f69120ceSTobin C. Harding * @h_reserved: Flag for handle for reserved credits.
464f69120ceSTobin C. Harding * @h_aborted: Flag indicating fatal error on handle.
465f69120ceSTobin C. Harding * @h_type: For handle statistics.
466f69120ceSTobin C. Harding * @h_line_no: For handle statistics.
467f69120ceSTobin C. Harding * @h_start_jiffies: Handle Start time.
468933f1c1eSJan Kara * @h_requested_credits: Holds @h_total_credits after handle is started.
469fdc3ef88SJan Kara * @h_revoke_credits_requested: Holds @h_revoke_credits after handle is started.
470f69120ceSTobin C. Harding * @saved_alloc_context: Saved context while transaction is open.
471470decc6SDave Kleikamp **/
472470decc6SDave Kleikamp
473470decc6SDave Kleikamp /* Docbook can't yet cope with the bit fields, but will leave the documentation
474470decc6SDave Kleikamp * in so it can be fixed later.
475470decc6SDave Kleikamp */
476470decc6SDave Kleikamp
4778aefcd55STheodore Ts'o struct jbd2_journal_handle
478470decc6SDave Kleikamp {
4798f7d89f3SJan Kara union {
480470decc6SDave Kleikamp transaction_t *h_transaction;
4818f7d89f3SJan Kara /* Which journal handle belongs to - used iff h_reserved set */
4828f7d89f3SJan Kara journal_t *h_journal;
4838f7d89f3SJan Kara };
4848f7d89f3SJan Kara
4858f7d89f3SJan Kara handle_t *h_rsv_handle;
486933f1c1eSJan Kara int h_total_credits;
487fdc3ef88SJan Kara int h_revoke_credits;
488fdc3ef88SJan Kara int h_revoke_credits_requested;
489470decc6SDave Kleikamp int h_ref;
490470decc6SDave Kleikamp int h_err;
491470decc6SDave Kleikamp
492470decc6SDave Kleikamp /* Flags [no locking] */
493f69120ceSTobin C. Harding unsigned int h_sync: 1;
494f69120ceSTobin C. Harding unsigned int h_jdata: 1;
495f69120ceSTobin C. Harding unsigned int h_reserved: 1;
496f69120ceSTobin C. Harding unsigned int h_aborted: 1;
497f69120ceSTobin C. Harding unsigned int h_type: 8;
498f69120ceSTobin C. Harding unsigned int h_line_no: 16;
499343d9c28STheodore Ts'o
500343d9c28STheodore Ts'o unsigned long h_start_jiffies;
501343d9c28STheodore Ts'o unsigned int h_requested_credits;
50281378da6SMichal Hocko
50381378da6SMichal Hocko unsigned int saved_alloc_context;
504470decc6SDave Kleikamp };
505470decc6SDave Kleikamp
506470decc6SDave Kleikamp
5078e85fb3fSJohann Lombardi /*
5088e85fb3fSJohann Lombardi * Some stats for checkpoint phase
5098e85fb3fSJohann Lombardi */
5108e85fb3fSJohann Lombardi struct transaction_chp_stats_s {
5118e85fb3fSJohann Lombardi unsigned long cs_chp_time;
512bf699327STheodore Ts'o __u32 cs_forced_to_close;
513bf699327STheodore Ts'o __u32 cs_written;
514bf699327STheodore Ts'o __u32 cs_dropped;
5158e85fb3fSJohann Lombardi };
5168e85fb3fSJohann Lombardi
517470decc6SDave Kleikamp /* The transaction_t type is the guts of the journaling mechanism. It
518470decc6SDave Kleikamp * tracks a compound transaction through its various states:
519470decc6SDave Kleikamp *
520470decc6SDave Kleikamp * RUNNING: accepting new updates
521470decc6SDave Kleikamp * LOCKED: Updates still running but we don't accept new ones
522470decc6SDave Kleikamp * RUNDOWN: Updates are tidying up but have finished requesting
523470decc6SDave Kleikamp * new buffers to modify (state not used for now)
524470decc6SDave Kleikamp * FLUSH: All updates complete, but we are still writing to disk
525470decc6SDave Kleikamp * COMMIT: All data on disk, writing commit record
526470decc6SDave Kleikamp * FINISHED: We still have to keep the transaction for checkpointing.
527470decc6SDave Kleikamp *
528470decc6SDave Kleikamp * The transaction keeps track of all of the buffers modified by a
529470decc6SDave Kleikamp * running transaction, and all of the buffers committed but not yet
530470decc6SDave Kleikamp * flushed to home for finished transactions.
53150a4952fSAlexander Lochmann * (Locking Documentation improved by LockDoc)
532470decc6SDave Kleikamp */
533470decc6SDave Kleikamp
534470decc6SDave Kleikamp /*
535470decc6SDave Kleikamp * Lock ranking:
536470decc6SDave Kleikamp *
537470decc6SDave Kleikamp * j_list_lock
538470decc6SDave Kleikamp * ->jbd_lock_bh_journal_head() (This is "innermost")
539470decc6SDave Kleikamp *
540470decc6SDave Kleikamp * j_state_lock
54146417064SThomas Gleixner * ->b_state_lock
542470decc6SDave Kleikamp *
54346417064SThomas Gleixner * b_state_lock
544470decc6SDave Kleikamp * ->j_list_lock
545470decc6SDave Kleikamp *
546470decc6SDave Kleikamp * j_state_lock
547470decc6SDave Kleikamp * ->j_list_lock (journal_unmap_buffer)
548470decc6SDave Kleikamp *
549470decc6SDave Kleikamp */
550470decc6SDave Kleikamp
551470decc6SDave Kleikamp struct transaction_s
552470decc6SDave Kleikamp {
553470decc6SDave Kleikamp /* Pointer to the journal for this transaction. [no locking] */
554470decc6SDave Kleikamp journal_t *t_journal;
555470decc6SDave Kleikamp
556470decc6SDave Kleikamp /* Sequence number for this transaction [no locking] */
557470decc6SDave Kleikamp tid_t t_tid;
558470decc6SDave Kleikamp
559470decc6SDave Kleikamp /*
560470decc6SDave Kleikamp * Transaction's current state
561f7f4bccbSMingming Cao * [no locking - only kjournald2 alters this]
562f5a7a6b0SJan Kara * [j_list_lock] guards transition of a transaction into T_FINISHED
563f5a7a6b0SJan Kara * state and subsequent call of __jbd2_journal_drop_transaction()
564470decc6SDave Kleikamp * FIXME: needs barriers
565470decc6SDave Kleikamp * KLUDGE: [use j_state_lock]
566470decc6SDave Kleikamp */
567470decc6SDave Kleikamp enum {
568470decc6SDave Kleikamp T_RUNNING,
569470decc6SDave Kleikamp T_LOCKED,
57096f1e097SJan Kara T_SWITCH,
571470decc6SDave Kleikamp T_FLUSH,
572470decc6SDave Kleikamp T_COMMIT,
573bbd2be36SJan Kara T_COMMIT_DFLUSH,
574bbd2be36SJan Kara T_COMMIT_JFLUSH,
575794446c6SDmitry Monakhov T_COMMIT_CALLBACK,
576470decc6SDave Kleikamp T_FINISHED
577470decc6SDave Kleikamp } t_state;
578470decc6SDave Kleikamp
579470decc6SDave Kleikamp /*
580470decc6SDave Kleikamp * Where in the log does this transaction's commit start? [no locking]
581470decc6SDave Kleikamp */
582470decc6SDave Kleikamp unsigned long t_log_start;
583470decc6SDave Kleikamp
5843042b1b4SAlexander Lochmann /*
5853042b1b4SAlexander Lochmann * Number of buffers on the t_buffers list [j_list_lock, no locks
5863042b1b4SAlexander Lochmann * needed for jbd2 thread]
5873042b1b4SAlexander Lochmann */
588470decc6SDave Kleikamp int t_nr_buffers;
589470decc6SDave Kleikamp
590470decc6SDave Kleikamp /*
591470decc6SDave Kleikamp * Doubly-linked circular list of all buffers reserved but not yet
5923042b1b4SAlexander Lochmann * modified by this transaction [j_list_lock, no locks needed fo
5933042b1b4SAlexander Lochmann * jbd2 thread]
594470decc6SDave Kleikamp */
595470decc6SDave Kleikamp struct journal_head *t_reserved_list;
596470decc6SDave Kleikamp
597470decc6SDave Kleikamp /*
598470decc6SDave Kleikamp * Doubly-linked circular list of all metadata buffers owned by this
5993042b1b4SAlexander Lochmann * transaction [j_list_lock, no locks needed for jbd2 thread]
600470decc6SDave Kleikamp */
601470decc6SDave Kleikamp struct journal_head *t_buffers;
602470decc6SDave Kleikamp
603470decc6SDave Kleikamp /*
604470decc6SDave Kleikamp * Doubly-linked circular list of all forget buffers (superseded
605470decc6SDave Kleikamp * buffers which we can un-checkpoint once this transaction commits)
606470decc6SDave Kleikamp * [j_list_lock]
607470decc6SDave Kleikamp */
608470decc6SDave Kleikamp struct journal_head *t_forget;
609470decc6SDave Kleikamp
610470decc6SDave Kleikamp /*
611470decc6SDave Kleikamp * Doubly-linked circular list of all buffers still to be flushed before
612470decc6SDave Kleikamp * this transaction can be checkpointed. [j_list_lock]
613470decc6SDave Kleikamp */
614470decc6SDave Kleikamp struct journal_head *t_checkpoint_list;
615470decc6SDave Kleikamp
616470decc6SDave Kleikamp /*
6173042b1b4SAlexander Lochmann * Doubly-linked circular list of metadata buffers being
6183042b1b4SAlexander Lochmann * shadowed by log IO. The IO buffers on the iobuf list and
6193042b1b4SAlexander Lochmann * the shadow buffers on this list match each other one for
6203042b1b4SAlexander Lochmann * one at all times. [j_list_lock, no locks needed for jbd2
6213042b1b4SAlexander Lochmann * thread]
622470decc6SDave Kleikamp */
623470decc6SDave Kleikamp struct journal_head *t_shadow_list;
624470decc6SDave Kleikamp
625470decc6SDave Kleikamp /*
626342af94eSMauricio Faria de Oliveira * List of inodes associated with the transaction; e.g., ext4 uses
627342af94eSMauricio Faria de Oliveira * this to track inodes in data=ordered and data=journal mode that
628342af94eSMauricio Faria de Oliveira * need special handling on transaction commit; also used by ocfs2.
629c851ed54SJan Kara * [j_list_lock]
630c851ed54SJan Kara */
631c851ed54SJan Kara struct list_head t_inode_list;
632c851ed54SJan Kara
633c851ed54SJan Kara /*
6348e85fb3fSJohann Lombardi * Longest time some handle had to wait for running transaction
6358e85fb3fSJohann Lombardi */
6368e85fb3fSJohann Lombardi unsigned long t_max_wait;
6378e85fb3fSJohann Lombardi
6388e85fb3fSJohann Lombardi /*
6398e85fb3fSJohann Lombardi * When transaction started
6408e85fb3fSJohann Lombardi */
6418e85fb3fSJohann Lombardi unsigned long t_start;
6428e85fb3fSJohann Lombardi
6438e85fb3fSJohann Lombardi /*
64450a4952fSAlexander Lochmann * When commit was requested [j_state_lock]
6459fff24aaSTheodore Ts'o */
6469fff24aaSTheodore Ts'o unsigned long t_requested;
6479fff24aaSTheodore Ts'o
6489fff24aaSTheodore Ts'o /*
64950a4952fSAlexander Lochmann * Checkpointing stats [j_list_lock]
6508e85fb3fSJohann Lombardi */
6518e85fb3fSJohann Lombardi struct transaction_chp_stats_s t_chp_stats;
6528e85fb3fSJohann Lombardi
6538e85fb3fSJohann Lombardi /*
654470decc6SDave Kleikamp * Number of outstanding updates running on this transaction
65532ea2750SAlexander Lochmann * [none]
656470decc6SDave Kleikamp */
657a51dca9cSTheodore Ts'o atomic_t t_updates;
658470decc6SDave Kleikamp
659470decc6SDave Kleikamp /*
6609f356e5aSJan Kara * Number of blocks reserved for this transaction in the journal.
6619f356e5aSJan Kara * This is including all credits reserved when starting transaction
6629f356e5aSJan Kara * handles as well as all journal descriptor blocks needed for this
6639f356e5aSJan Kara * transaction. [none]
664470decc6SDave Kleikamp */
665a51dca9cSTheodore Ts'o atomic_t t_outstanding_credits;
666470decc6SDave Kleikamp
667470decc6SDave Kleikamp /*
668fdc3ef88SJan Kara * Number of revoke records for this transaction added by already
669fdc3ef88SJan Kara * stopped handles. [none]
670fdc3ef88SJan Kara */
671fdc3ef88SJan Kara atomic_t t_outstanding_revokes;
672fdc3ef88SJan Kara
673fdc3ef88SJan Kara /*
674fdc3ef88SJan Kara * How many handles used this transaction? [none]
675fdc3ef88SJan Kara */
676fdc3ef88SJan Kara atomic_t t_handle_count;
677fdc3ef88SJan Kara
678fdc3ef88SJan Kara /*
679470decc6SDave Kleikamp * Forward and backward links for the circular list of all transactions
680470decc6SDave Kleikamp * awaiting checkpoint. [j_list_lock]
681470decc6SDave Kleikamp */
682470decc6SDave Kleikamp transaction_t *t_cpnext, *t_cpprev;
683470decc6SDave Kleikamp
684470decc6SDave Kleikamp /*
685470decc6SDave Kleikamp * When will the transaction expire (become due for commit), in jiffies?
686470decc6SDave Kleikamp * [no locking]
687470decc6SDave Kleikamp */
688470decc6SDave Kleikamp unsigned long t_expires;
689470decc6SDave Kleikamp
690470decc6SDave Kleikamp /*
691e07f7183SJosef Bacik * When this transaction started, in nanoseconds [no locking]
692e07f7183SJosef Bacik */
693e07f7183SJosef Bacik ktime_t t_start_time;
694e07f7183SJosef Bacik
695e07f7183SJosef Bacik /*
6967058548cSTheodore Ts'o * This transaction is being forced and some process is
6977058548cSTheodore Ts'o * waiting for it to finish.
6987058548cSTheodore Ts'o */
6990ccff1a4SH Hartley Sweeten unsigned int t_synchronous_commit:1;
70081be12c8SJan Kara
70181be12c8SJan Kara /* Disk flush needs to be sent to fs partition [no locking] */
70281be12c8SJan Kara int t_need_data_flush;
7037058548cSTheodore Ts'o
7047058548cSTheodore Ts'o /*
7053e624fc7STheodore Ts'o * For use by the filesystem to store fs-specific data
7063e624fc7STheodore Ts'o * structures associated with the transaction
7073e624fc7STheodore Ts'o */
7083e624fc7STheodore Ts'o struct list_head t_private_list;
709470decc6SDave Kleikamp };
710470decc6SDave Kleikamp
7118e85fb3fSJohann Lombardi struct transaction_run_stats_s {
7128e85fb3fSJohann Lombardi unsigned long rs_wait;
7139fff24aaSTheodore Ts'o unsigned long rs_request_delay;
7148e85fb3fSJohann Lombardi unsigned long rs_running;
7158e85fb3fSJohann Lombardi unsigned long rs_locked;
7168e85fb3fSJohann Lombardi unsigned long rs_flushing;
7178e85fb3fSJohann Lombardi unsigned long rs_logging;
7188e85fb3fSJohann Lombardi
719bf699327STheodore Ts'o __u32 rs_handle_count;
720bf699327STheodore Ts'o __u32 rs_blocks;
721bf699327STheodore Ts'o __u32 rs_blocks_logged;
7228e85fb3fSJohann Lombardi };
7238e85fb3fSJohann Lombardi
7248e85fb3fSJohann Lombardi struct transaction_stats_s {
7258e85fb3fSJohann Lombardi unsigned long ts_tid;
7269fff24aaSTheodore Ts'o unsigned long ts_requested;
7278e85fb3fSJohann Lombardi struct transaction_run_stats_s run;
7288e85fb3fSJohann Lombardi };
7298e85fb3fSJohann Lombardi
7308e85fb3fSJohann Lombardi static inline unsigned long
jbd2_time_diff(unsigned long start,unsigned long end)7318e85fb3fSJohann Lombardi jbd2_time_diff(unsigned long start, unsigned long end)
7328e85fb3fSJohann Lombardi {
7338e85fb3fSJohann Lombardi if (end >= start)
7348e85fb3fSJohann Lombardi return end - start;
7358e85fb3fSJohann Lombardi
7368e85fb3fSJohann Lombardi return end + (MAX_JIFFY_OFFSET - start);
7378e85fb3fSJohann Lombardi }
7388e85fb3fSJohann Lombardi
7391a0d3786STheodore Ts'o #define JBD2_NR_BATCH 64
7401a0d3786STheodore Ts'o
7415b849b5fSHarshad Shirwadkar enum passtype {PASS_SCAN, PASS_REVOKE, PASS_REPLAY};
7425b849b5fSHarshad Shirwadkar
7435b849b5fSHarshad Shirwadkar #define JBD2_FC_REPLAY_STOP 0
7445b849b5fSHarshad Shirwadkar #define JBD2_FC_REPLAY_CONTINUE 1
7455b849b5fSHarshad Shirwadkar
746470decc6SDave Kleikamp /**
747470decc6SDave Kleikamp * struct journal_s - The journal_s type is the concrete type associated with
748470decc6SDave Kleikamp * journal_t.
749470decc6SDave Kleikamp */
750470decc6SDave Kleikamp struct journal_s
751470decc6SDave Kleikamp {
752f69120ceSTobin C. Harding /**
753d699ae4fSAlexander Lochmann * @j_flags: General journaling state flags [j_state_lock,
754d699ae4fSAlexander Lochmann * no lock for quick racy checks]
755f69120ceSTobin C. Harding */
756470decc6SDave Kleikamp unsigned long j_flags;
757470decc6SDave Kleikamp
758f69120ceSTobin C. Harding /**
759fcf37549SZhang Yi * @j_atomic_flags: Atomic journaling state flags.
760fcf37549SZhang Yi */
761fcf37549SZhang Yi unsigned long j_atomic_flags;
762fcf37549SZhang Yi
763fcf37549SZhang Yi /**
764f69120ceSTobin C. Harding * @j_errno:
765f69120ceSTobin C. Harding *
766470decc6SDave Kleikamp * Is there an outstanding uncleared error on the journal (from a prior
767470decc6SDave Kleikamp * abort)? [j_state_lock]
768470decc6SDave Kleikamp */
769470decc6SDave Kleikamp int j_errno;
770470decc6SDave Kleikamp
771f69120ceSTobin C. Harding /**
7727b97d868Szhangyi (F) * @j_abort_mutex: Lock the whole aborting procedure.
7737b97d868Szhangyi (F) */
7747b97d868Szhangyi (F) struct mutex j_abort_mutex;
7757b97d868Szhangyi (F)
7767b97d868Szhangyi (F) /**
777f69120ceSTobin C. Harding * @j_sb_buffer: The first part of the superblock buffer.
778f69120ceSTobin C. Harding */
779470decc6SDave Kleikamp struct buffer_head *j_sb_buffer;
780f69120ceSTobin C. Harding
781f69120ceSTobin C. Harding /**
782f69120ceSTobin C. Harding * @j_superblock: The second part of the superblock buffer.
783f69120ceSTobin C. Harding */
784470decc6SDave Kleikamp journal_superblock_t *j_superblock;
785470decc6SDave Kleikamp
786f69120ceSTobin C. Harding /**
787f69120ceSTobin C. Harding * @j_state_lock: Protect the various scalars in the journal.
788470decc6SDave Kleikamp */
789a931da6aSTheodore Ts'o rwlock_t j_state_lock;
790470decc6SDave Kleikamp
791f69120ceSTobin C. Harding /**
792f69120ceSTobin C. Harding * @j_barrier_count:
793f69120ceSTobin C. Harding *
794d699ae4fSAlexander Lochmann * Number of processes waiting to create a barrier lock [j_state_lock,
795d699ae4fSAlexander Lochmann * no lock for quick racy checks]
796470decc6SDave Kleikamp */
797470decc6SDave Kleikamp int j_barrier_count;
798470decc6SDave Kleikamp
799f69120ceSTobin C. Harding /**
800f69120ceSTobin C. Harding * @j_barrier: The barrier lock itself.
801f69120ceSTobin C. Harding */
802470decc6SDave Kleikamp struct mutex j_barrier;
803470decc6SDave Kleikamp
804f69120ceSTobin C. Harding /**
805f69120ceSTobin C. Harding * @j_running_transaction:
806f69120ceSTobin C. Harding *
807470decc6SDave Kleikamp * Transactions: The current running transaction...
808d699ae4fSAlexander Lochmann * [j_state_lock, no lock for quick racy checks] [caller holding
809d699ae4fSAlexander Lochmann * open handle]
810470decc6SDave Kleikamp */
811470decc6SDave Kleikamp transaction_t *j_running_transaction;
812470decc6SDave Kleikamp
813f69120ceSTobin C. Harding /**
814f69120ceSTobin C. Harding * @j_committing_transaction:
815f69120ceSTobin C. Harding *
816470decc6SDave Kleikamp * the transaction we are pushing to disk
817470decc6SDave Kleikamp * [j_state_lock] [caller holding open handle]
818470decc6SDave Kleikamp */
819470decc6SDave Kleikamp transaction_t *j_committing_transaction;
820470decc6SDave Kleikamp
821f69120ceSTobin C. Harding /**
822f69120ceSTobin C. Harding * @j_checkpoint_transactions:
823f69120ceSTobin C. Harding *
824470decc6SDave Kleikamp * ... and a linked circular list of all transactions waiting for
825470decc6SDave Kleikamp * checkpointing. [j_list_lock]
826470decc6SDave Kleikamp */
827470decc6SDave Kleikamp transaction_t *j_checkpoint_transactions;
828470decc6SDave Kleikamp
829f69120ceSTobin C. Harding /**
830f69120ceSTobin C. Harding * @j_wait_transaction_locked:
831f69120ceSTobin C. Harding *
832470decc6SDave Kleikamp * Wait queue for waiting for a locked transaction to start committing,
833f69120ceSTobin C. Harding * or for a barrier lock to be released.
834470decc6SDave Kleikamp */
835470decc6SDave Kleikamp wait_queue_head_t j_wait_transaction_locked;
836470decc6SDave Kleikamp
837f69120ceSTobin C. Harding /**
838f69120ceSTobin C. Harding * @j_wait_done_commit: Wait queue for waiting for commit to complete.
839f69120ceSTobin C. Harding */
840470decc6SDave Kleikamp wait_queue_head_t j_wait_done_commit;
841470decc6SDave Kleikamp
842f69120ceSTobin C. Harding /**
843f69120ceSTobin C. Harding * @j_wait_commit: Wait queue to trigger commit.
844f69120ceSTobin C. Harding */
845470decc6SDave Kleikamp wait_queue_head_t j_wait_commit;
846470decc6SDave Kleikamp
847f69120ceSTobin C. Harding /**
848f69120ceSTobin C. Harding * @j_wait_updates: Wait queue to wait for updates to complete.
849f69120ceSTobin C. Harding */
850470decc6SDave Kleikamp wait_queue_head_t j_wait_updates;
851470decc6SDave Kleikamp
852f69120ceSTobin C. Harding /**
853f69120ceSTobin C. Harding * @j_wait_reserved:
854f69120ceSTobin C. Harding *
855f69120ceSTobin C. Harding * Wait queue to wait for reserved buffer credits to drop.
856f69120ceSTobin C. Harding */
8578f7d89f3SJan Kara wait_queue_head_t j_wait_reserved;
8588f7d89f3SJan Kara
859f69120ceSTobin C. Harding /**
860ff780b91SHarshad Shirwadkar * @j_fc_wait:
861ff780b91SHarshad Shirwadkar *
862ff780b91SHarshad Shirwadkar * Wait queue to wait for completion of async fast commits.
863ff780b91SHarshad Shirwadkar */
864ff780b91SHarshad Shirwadkar wait_queue_head_t j_fc_wait;
865ff780b91SHarshad Shirwadkar
866ff780b91SHarshad Shirwadkar /**
867f69120ceSTobin C. Harding * @j_checkpoint_mutex:
868f69120ceSTobin C. Harding *
869f69120ceSTobin C. Harding * Semaphore for locking against concurrent checkpoints.
870f69120ceSTobin C. Harding */
871470decc6SDave Kleikamp struct mutex j_checkpoint_mutex;
872470decc6SDave Kleikamp
873f69120ceSTobin C. Harding /**
874f69120ceSTobin C. Harding * @j_chkpt_bhs:
875f69120ceSTobin C. Harding *
8761a0d3786STheodore Ts'o * List of buffer heads used by the checkpoint routine. This
8771a0d3786STheodore Ts'o * was moved from jbd2_log_do_checkpoint() to reduce stack
8781a0d3786STheodore Ts'o * usage. Access to this array is controlled by the
879f69120ceSTobin C. Harding * @j_checkpoint_mutex. [j_checkpoint_mutex]
8801a0d3786STheodore Ts'o */
8811a0d3786STheodore Ts'o struct buffer_head *j_chkpt_bhs[JBD2_NR_BATCH];
8821a0d3786STheodore Ts'o
883f69120ceSTobin C. Harding /**
8844ba3fcddSZhang Yi * @j_shrinker:
8854ba3fcddSZhang Yi *
8864ba3fcddSZhang Yi * Journal head shrinker, reclaim buffer's journal head which
8874ba3fcddSZhang Yi * has been written back.
8884ba3fcddSZhang Yi */
8894ba3fcddSZhang Yi struct shrinker j_shrinker;
8904ba3fcddSZhang Yi
8914ba3fcddSZhang Yi /**
8920705e8d1STheodore Ts'o * @j_checkpoint_jh_count:
8934ba3fcddSZhang Yi *
8944ba3fcddSZhang Yi * Number of journal buffers on the checkpoint list. [j_list_lock]
8954ba3fcddSZhang Yi */
8960705e8d1STheodore Ts'o struct percpu_counter j_checkpoint_jh_count;
8974ba3fcddSZhang Yi
8984ba3fcddSZhang Yi /**
8994ba3fcddSZhang Yi * @j_shrink_transaction:
9004ba3fcddSZhang Yi *
9014ba3fcddSZhang Yi * Record next transaction will shrink on the checkpoint list.
9024ba3fcddSZhang Yi * [j_list_lock]
9034ba3fcddSZhang Yi */
9044ba3fcddSZhang Yi transaction_t *j_shrink_transaction;
9054ba3fcddSZhang Yi
9064ba3fcddSZhang Yi /**
907f69120ceSTobin C. Harding * @j_head:
908f69120ceSTobin C. Harding *
909470decc6SDave Kleikamp * Journal head: identifies the first unused block in the journal.
910470decc6SDave Kleikamp * [j_state_lock]
911470decc6SDave Kleikamp */
912470decc6SDave Kleikamp unsigned long j_head;
913470decc6SDave Kleikamp
914f69120ceSTobin C. Harding /**
915f69120ceSTobin C. Harding * @j_tail:
916f69120ceSTobin C. Harding *
917470decc6SDave Kleikamp * Journal tail: identifies the oldest still-used block in the journal.
918470decc6SDave Kleikamp * [j_state_lock]
919470decc6SDave Kleikamp */
920470decc6SDave Kleikamp unsigned long j_tail;
921470decc6SDave Kleikamp
922f69120ceSTobin C. Harding /**
923f69120ceSTobin C. Harding * @j_free:
924f69120ceSTobin C. Harding *
925470decc6SDave Kleikamp * Journal free: how many free blocks are there in the journal?
926470decc6SDave Kleikamp * [j_state_lock]
927470decc6SDave Kleikamp */
928470decc6SDave Kleikamp unsigned long j_free;
929470decc6SDave Kleikamp
930f69120ceSTobin C. Harding /**
931f69120ceSTobin C. Harding * @j_first:
932f69120ceSTobin C. Harding *
933f69120ceSTobin C. Harding * The block number of the first usable block in the journal
934f69120ceSTobin C. Harding * [j_state_lock].
935470decc6SDave Kleikamp */
936470decc6SDave Kleikamp unsigned long j_first;
937f69120ceSTobin C. Harding
938f69120ceSTobin C. Harding /**
939f69120ceSTobin C. Harding * @j_last:
940f69120ceSTobin C. Harding *
941f69120ceSTobin C. Harding * The block number one beyond the last usable block in the journal
942f69120ceSTobin C. Harding * [j_state_lock].
943f69120ceSTobin C. Harding */
944470decc6SDave Kleikamp unsigned long j_last;
945470decc6SDave Kleikamp
946f69120ceSTobin C. Harding /**
9476866d7b3SHarshad Shirwadkar * @j_fc_first:
9486866d7b3SHarshad Shirwadkar *
9496866d7b3SHarshad Shirwadkar * The block number of the first fast commit block in the journal
9506866d7b3SHarshad Shirwadkar * [j_state_lock].
9516866d7b3SHarshad Shirwadkar */
9526866d7b3SHarshad Shirwadkar unsigned long j_fc_first;
9536866d7b3SHarshad Shirwadkar
9546866d7b3SHarshad Shirwadkar /**
9556866d7b3SHarshad Shirwadkar * @j_fc_off:
9566866d7b3SHarshad Shirwadkar *
957c460e5edSHarshad Shirwadkar * Number of fast commit blocks currently allocated. Accessed only
958c460e5edSHarshad Shirwadkar * during fast commit. Currently only process can do fast commit, so
959c460e5edSHarshad Shirwadkar * this field is not protected by any lock.
9606866d7b3SHarshad Shirwadkar */
9616866d7b3SHarshad Shirwadkar unsigned long j_fc_off;
9626866d7b3SHarshad Shirwadkar
9636866d7b3SHarshad Shirwadkar /**
9646866d7b3SHarshad Shirwadkar * @j_fc_last:
9656866d7b3SHarshad Shirwadkar *
9666866d7b3SHarshad Shirwadkar * The block number one beyond the last fast commit block in the journal
9676866d7b3SHarshad Shirwadkar * [j_state_lock].
9686866d7b3SHarshad Shirwadkar */
9696866d7b3SHarshad Shirwadkar unsigned long j_fc_last;
9706866d7b3SHarshad Shirwadkar
9716866d7b3SHarshad Shirwadkar /**
972f69120ceSTobin C. Harding * @j_dev: Device where we store the journal.
973470decc6SDave Kleikamp */
974470decc6SDave Kleikamp struct block_device *j_dev;
975f69120ceSTobin C. Harding
976f69120ceSTobin C. Harding /**
977f69120ceSTobin C. Harding * @j_blocksize: Block size for the location where we store the journal.
978f69120ceSTobin C. Harding */
979470decc6SDave Kleikamp int j_blocksize;
980f69120ceSTobin C. Harding
981f69120ceSTobin C. Harding /**
982f69120ceSTobin C. Harding * @j_blk_offset:
983f69120ceSTobin C. Harding *
984f69120ceSTobin C. Harding * Starting block offset into the device where we store the journal.
985f69120ceSTobin C. Harding */
98618eba7aaSMingming Cao unsigned long long j_blk_offset;
987f69120ceSTobin C. Harding
988f69120ceSTobin C. Harding /**
989f69120ceSTobin C. Harding * @j_devname: Journal device name.
990f69120ceSTobin C. Harding */
99105496769STheodore Ts'o char j_devname[BDEVNAME_SIZE+24];
992470decc6SDave Kleikamp
993f69120ceSTobin C. Harding /**
994f69120ceSTobin C. Harding * @j_fs_dev:
995f69120ceSTobin C. Harding *
996470decc6SDave Kleikamp * Device which holds the client fs. For internal journal this will be
997470decc6SDave Kleikamp * equal to j_dev.
998470decc6SDave Kleikamp */
999470decc6SDave Kleikamp struct block_device *j_fs_dev;
1000470decc6SDave Kleikamp
1001f69120ceSTobin C. Harding /**
1002ede7dc7fSHarshad Shirwadkar * @j_total_len: Total maximum capacity of the journal region on disk.
1003f69120ceSTobin C. Harding */
1004ede7dc7fSHarshad Shirwadkar unsigned int j_total_len;
1005470decc6SDave Kleikamp
1006f69120ceSTobin C. Harding /**
1007f69120ceSTobin C. Harding * @j_reserved_credits:
1008f69120ceSTobin C. Harding *
1009f69120ceSTobin C. Harding * Number of buffers reserved from the running transaction.
1010f69120ceSTobin C. Harding */
10118f7d89f3SJan Kara atomic_t j_reserved_credits;
10128f7d89f3SJan Kara
1013f69120ceSTobin C. Harding /**
1014f69120ceSTobin C. Harding * @j_list_lock: Protects the buffer lists and internal buffer state.
1015470decc6SDave Kleikamp */
1016470decc6SDave Kleikamp spinlock_t j_list_lock;
1017470decc6SDave Kleikamp
1018f69120ceSTobin C. Harding /**
1019f69120ceSTobin C. Harding * @j_inode:
1020f69120ceSTobin C. Harding *
1021f69120ceSTobin C. Harding * Optional inode where we store the journal. If present, all
1022f69120ceSTobin C. Harding * journal block numbers are mapped into this inode via bmap().
1023f69120ceSTobin C. Harding */
1024470decc6SDave Kleikamp struct inode *j_inode;
1025470decc6SDave Kleikamp
1026f69120ceSTobin C. Harding /**
1027f69120ceSTobin C. Harding * @j_tail_sequence:
1028f69120ceSTobin C. Harding *
1029470decc6SDave Kleikamp * Sequence number of the oldest transaction in the log [j_state_lock]
1030470decc6SDave Kleikamp */
1031470decc6SDave Kleikamp tid_t j_tail_sequence;
1032470decc6SDave Kleikamp
1033f69120ceSTobin C. Harding /**
1034f69120ceSTobin C. Harding * @j_transaction_sequence:
1035f69120ceSTobin C. Harding *
1036470decc6SDave Kleikamp * Sequence number of the next transaction to grant [j_state_lock]
1037470decc6SDave Kleikamp */
1038470decc6SDave Kleikamp tid_t j_transaction_sequence;
1039470decc6SDave Kleikamp
1040f69120ceSTobin C. Harding /**
1041f69120ceSTobin C. Harding * @j_commit_sequence:
1042f69120ceSTobin C. Harding *
1043470decc6SDave Kleikamp * Sequence number of the most recently committed transaction
1044d699ae4fSAlexander Lochmann * [j_state_lock, no lock for quick racy checks]
1045470decc6SDave Kleikamp */
1046470decc6SDave Kleikamp tid_t j_commit_sequence;
1047470decc6SDave Kleikamp
1048f69120ceSTobin C. Harding /**
1049f69120ceSTobin C. Harding * @j_commit_request:
1050f69120ceSTobin C. Harding *
1051470decc6SDave Kleikamp * Sequence number of the most recent transaction wanting commit
1052d699ae4fSAlexander Lochmann * [j_state_lock, no lock for quick racy checks]
1053470decc6SDave Kleikamp */
1054470decc6SDave Kleikamp tid_t j_commit_request;
1055470decc6SDave Kleikamp
1056f69120ceSTobin C. Harding /**
1057f69120ceSTobin C. Harding * @j_uuid:
1058f69120ceSTobin C. Harding *
1059470decc6SDave Kleikamp * Journal uuid: identifies the object (filesystem, LVM volume etc)
1060470decc6SDave Kleikamp * backed by this journal. This will eventually be replaced by an array
1061470decc6SDave Kleikamp * of uuids, allowing us to index multiple devices within a single
1062470decc6SDave Kleikamp * journal and to perform atomic updates across them.
1063470decc6SDave Kleikamp */
1064470decc6SDave Kleikamp __u8 j_uuid[16];
1065470decc6SDave Kleikamp
1066f69120ceSTobin C. Harding /**
1067f69120ceSTobin C. Harding * @j_task: Pointer to the current commit thread for this journal.
1068f69120ceSTobin C. Harding */
1069470decc6SDave Kleikamp struct task_struct *j_task;
1070470decc6SDave Kleikamp
1071f69120ceSTobin C. Harding /**
1072f69120ceSTobin C. Harding * @j_max_transaction_buffers:
1073f69120ceSTobin C. Harding *
1074470decc6SDave Kleikamp * Maximum number of metadata buffers to allow in a single compound
1075f69120ceSTobin C. Harding * commit transaction.
1076470decc6SDave Kleikamp */
1077470decc6SDave Kleikamp int j_max_transaction_buffers;
1078470decc6SDave Kleikamp
1079f69120ceSTobin C. Harding /**
1080fdc3ef88SJan Kara * @j_revoke_records_per_block:
1081fdc3ef88SJan Kara *
1082fdc3ef88SJan Kara * Number of revoke records that fit in one descriptor block.
1083fdc3ef88SJan Kara */
1084fdc3ef88SJan Kara int j_revoke_records_per_block;
1085fdc3ef88SJan Kara
1086fdc3ef88SJan Kara /**
1087f69120ceSTobin C. Harding * @j_commit_interval:
1088f69120ceSTobin C. Harding *
1089470decc6SDave Kleikamp * What is the maximum transaction lifetime before we begin a commit?
1090470decc6SDave Kleikamp */
1091470decc6SDave Kleikamp unsigned long j_commit_interval;
1092470decc6SDave Kleikamp
1093f69120ceSTobin C. Harding /**
1094f69120ceSTobin C. Harding * @j_commit_timer: The timer used to wakeup the commit thread.
1095f69120ceSTobin C. Harding */
1096470decc6SDave Kleikamp struct timer_list j_commit_timer;
1097470decc6SDave Kleikamp
1098f69120ceSTobin C. Harding /**
1099f69120ceSTobin C. Harding * @j_revoke_lock: Protect the revoke table.
1100470decc6SDave Kleikamp */
1101470decc6SDave Kleikamp spinlock_t j_revoke_lock;
1102f69120ceSTobin C. Harding
1103f69120ceSTobin C. Harding /**
1104f69120ceSTobin C. Harding * @j_revoke:
1105f69120ceSTobin C. Harding *
1106f69120ceSTobin C. Harding * The revoke table - maintains the list of revoked blocks in the
1107f69120ceSTobin C. Harding * current transaction.
1108f69120ceSTobin C. Harding */
1109f7f4bccbSMingming Cao struct jbd2_revoke_table_s *j_revoke;
1110f69120ceSTobin C. Harding
1111f69120ceSTobin C. Harding /**
1112f69120ceSTobin C. Harding * @j_revoke_table: Alternate revoke tables for j_revoke.
1113f69120ceSTobin C. Harding */
1114f7f4bccbSMingming Cao struct jbd2_revoke_table_s *j_revoke_table[2];
1115470decc6SDave Kleikamp
1116f69120ceSTobin C. Harding /**
1117f69120ceSTobin C. Harding * @j_wbuf: Array of bhs for jbd2_journal_commit_transaction.
1118470decc6SDave Kleikamp */
1119470decc6SDave Kleikamp struct buffer_head **j_wbuf;
1120f69120ceSTobin C. Harding
1121f69120ceSTobin C. Harding /**
1122c460e5edSHarshad Shirwadkar * @j_fc_wbuf: Array of fast commit bhs for fast commit. Accessed only
1123c460e5edSHarshad Shirwadkar * during a fast commit. Currently only process can do fast commit, so
1124c460e5edSHarshad Shirwadkar * this field is not protected by any lock.
11256866d7b3SHarshad Shirwadkar */
11266866d7b3SHarshad Shirwadkar struct buffer_head **j_fc_wbuf;
11276866d7b3SHarshad Shirwadkar
11286866d7b3SHarshad Shirwadkar /**
1129f69120ceSTobin C. Harding * @j_wbufsize:
1130f69120ceSTobin C. Harding *
1131f69120ceSTobin C. Harding * Size of @j_wbuf array.
1132f69120ceSTobin C. Harding */
1133470decc6SDave Kleikamp int j_wbufsize;
1134470decc6SDave Kleikamp
1135f69120ceSTobin C. Harding /**
11366866d7b3SHarshad Shirwadkar * @j_fc_wbufsize:
11376866d7b3SHarshad Shirwadkar *
11386866d7b3SHarshad Shirwadkar * Size of @j_fc_wbuf array.
11396866d7b3SHarshad Shirwadkar */
11406866d7b3SHarshad Shirwadkar int j_fc_wbufsize;
11416866d7b3SHarshad Shirwadkar
11426866d7b3SHarshad Shirwadkar /**
1143f69120ceSTobin C. Harding * @j_last_sync_writer:
1144f69120ceSTobin C. Harding *
1145f69120ceSTobin C. Harding * The pid of the last person to run a synchronous operation
1146f69120ceSTobin C. Harding * through the journal.
1147e07f7183SJosef Bacik */
1148470decc6SDave Kleikamp pid_t j_last_sync_writer;
1149470decc6SDave Kleikamp
1150f69120ceSTobin C. Harding /**
1151f69120ceSTobin C. Harding * @j_average_commit_time:
1152f69120ceSTobin C. Harding *
1153f69120ceSTobin C. Harding * The average amount of time in nanoseconds it takes to commit a
1154e07f7183SJosef Bacik * transaction to disk. [j_state_lock]
1155e07f7183SJosef Bacik */
1156e07f7183SJosef Bacik u64 j_average_commit_time;
1157e07f7183SJosef Bacik
1158f69120ceSTobin C. Harding /**
1159f69120ceSTobin C. Harding * @j_min_batch_time:
1160f69120ceSTobin C. Harding *
1161f69120ceSTobin C. Harding * Minimum time that we should wait for additional filesystem operations
1162f69120ceSTobin C. Harding * to get batched into a synchronous handle in microseconds.
116330773840STheodore Ts'o */
116430773840STheodore Ts'o u32 j_min_batch_time;
1165f69120ceSTobin C. Harding
1166f69120ceSTobin C. Harding /**
1167f69120ceSTobin C. Harding * @j_max_batch_time:
1168f69120ceSTobin C. Harding *
1169f69120ceSTobin C. Harding * Maximum time that we should wait for additional filesystem operations
1170f69120ceSTobin C. Harding * to get batched into a synchronous handle in microseconds.
1171f69120ceSTobin C. Harding */
117230773840STheodore Ts'o u32 j_max_batch_time;
117330773840STheodore Ts'o
1174f69120ceSTobin C. Harding /**
1175f69120ceSTobin C. Harding * @j_commit_callback:
1176f69120ceSTobin C. Harding *
1177f69120ceSTobin C. Harding * This function is called when a transaction is closed.
1178f69120ceSTobin C. Harding */
11793e624fc7STheodore Ts'o void (*j_commit_callback)(journal_t *,
11803e624fc7STheodore Ts'o transaction_t *);
11813e624fc7STheodore Ts'o
1182342af94eSMauricio Faria de Oliveira /**
1183342af94eSMauricio Faria de Oliveira * @j_submit_inode_data_buffers:
1184342af94eSMauricio Faria de Oliveira *
1185342af94eSMauricio Faria de Oliveira * This function is called for all inodes associated with the
1186342af94eSMauricio Faria de Oliveira * committing transaction marked with JI_WRITE_DATA flag
1187342af94eSMauricio Faria de Oliveira * before we start to write out the transaction to the journal.
1188342af94eSMauricio Faria de Oliveira */
1189342af94eSMauricio Faria de Oliveira int (*j_submit_inode_data_buffers)
1190342af94eSMauricio Faria de Oliveira (struct jbd2_inode *);
1191342af94eSMauricio Faria de Oliveira
1192342af94eSMauricio Faria de Oliveira /**
1193342af94eSMauricio Faria de Oliveira * @j_finish_inode_data_buffers:
1194342af94eSMauricio Faria de Oliveira *
1195342af94eSMauricio Faria de Oliveira * This function is called for all inodes associated with the
1196342af94eSMauricio Faria de Oliveira * committing transaction marked with JI_WAIT_DATA flag
1197342af94eSMauricio Faria de Oliveira * after we have written the transaction to the journal
1198342af94eSMauricio Faria de Oliveira * but before we write out the commit block.
1199342af94eSMauricio Faria de Oliveira */
1200342af94eSMauricio Faria de Oliveira int (*j_finish_inode_data_buffers)
1201342af94eSMauricio Faria de Oliveira (struct jbd2_inode *);
1202342af94eSMauricio Faria de Oliveira
1203470decc6SDave Kleikamp /*
12048e85fb3fSJohann Lombardi * Journal statistics
12058e85fb3fSJohann Lombardi */
1206f69120ceSTobin C. Harding
1207f69120ceSTobin C. Harding /**
1208f69120ceSTobin C. Harding * @j_history_lock: Protect the transactions statistics history.
1209f69120ceSTobin C. Harding */
12108e85fb3fSJohann Lombardi spinlock_t j_history_lock;
1211f69120ceSTobin C. Harding
1212f69120ceSTobin C. Harding /**
1213f69120ceSTobin C. Harding * @j_proc_entry: procfs entry for the jbd statistics directory.
1214f69120ceSTobin C. Harding */
12158e85fb3fSJohann Lombardi struct proc_dir_entry *j_proc_entry;
1216f69120ceSTobin C. Harding
1217f69120ceSTobin C. Harding /**
1218f69120ceSTobin C. Harding * @j_stats: Overall statistics.
1219f69120ceSTobin C. Harding */
12208e85fb3fSJohann Lombardi struct transaction_stats_s j_stats;
12218e85fb3fSJohann Lombardi
1222f69120ceSTobin C. Harding /**
1223f69120ceSTobin C. Harding * @j_failed_commit: Failed journal commit ID.
1224f69120ceSTobin C. Harding */
1225624080edSTheodore Ts'o unsigned int j_failed_commit;
1226624080edSTheodore Ts'o
1227f69120ceSTobin C. Harding /**
1228f69120ceSTobin C. Harding * @j_private:
1229f69120ceSTobin C. Harding *
1230470decc6SDave Kleikamp * An opaque pointer to fs-private information. ext3 puts its
1231f69120ceSTobin C. Harding * superblock pointer here.
1232470decc6SDave Kleikamp */
1233470decc6SDave Kleikamp void *j_private;
123401b5adceSDarrick J. Wong
1235f69120ceSTobin C. Harding /**
1236f69120ceSTobin C. Harding * @j_chksum_driver:
1237f69120ceSTobin C. Harding *
1238f69120ceSTobin C. Harding * Reference to checksum algorithm driver via cryptoapi.
1239f69120ceSTobin C. Harding */
124001b5adceSDarrick J. Wong struct crypto_shash *j_chksum_driver;
12414fd5ea43SDarrick J. Wong
1242f69120ceSTobin C. Harding /**
1243f69120ceSTobin C. Harding * @j_csum_seed:
1244f69120ceSTobin C. Harding *
1245f69120ceSTobin C. Harding * Precomputed journal UUID checksum for seeding other checksums.
1246f69120ceSTobin C. Harding */
12474fd5ea43SDarrick J. Wong __u32 j_csum_seed;
1248ab714affSJan Kara
1249ab714affSJan Kara #ifdef CONFIG_DEBUG_LOCK_ALLOC
1250f69120ceSTobin C. Harding /**
1251f69120ceSTobin C. Harding * @j_trans_commit_map:
1252f69120ceSTobin C. Harding *
1253ab714affSJan Kara * Lockdep entity to track transaction commit dependencies. Handles
1254ab714affSJan Kara * hold this "lock" for read, when we wait for commit, we acquire the
1255ab714affSJan Kara * "lock" for writing. This matches the properties of jbd2 journalling
1256ab714affSJan Kara * where the running transaction has to wait for all handles to be
1257ab714affSJan Kara * dropped to commit that transaction and also acquiring a handle may
1258ab714affSJan Kara * require transaction commit to finish.
1259ab714affSJan Kara */
1260ab714affSJan Kara struct lockdep_map j_trans_commit_map;
1261ab714affSJan Kara #endif
1262ff780b91SHarshad Shirwadkar
1263ff780b91SHarshad Shirwadkar /**
1264ff780b91SHarshad Shirwadkar * @j_fc_cleanup_callback:
1265ff780b91SHarshad Shirwadkar *
1266ff780b91SHarshad Shirwadkar * Clean-up after fast commit or full commit. JBD2 calls this function
1267ff780b91SHarshad Shirwadkar * after every commit operation.
1268ff780b91SHarshad Shirwadkar */
1269e85c81baSXin Yin void (*j_fc_cleanup_callback)(struct journal_s *journal, int full, tid_t tid);
1270ff780b91SHarshad Shirwadkar
1271ea4b01d9SMauro Carvalho Chehab /**
12725b849b5fSHarshad Shirwadkar * @j_fc_replay_callback:
12735b849b5fSHarshad Shirwadkar *
12745b849b5fSHarshad Shirwadkar * File-system specific function that performs replay of a fast
12755b849b5fSHarshad Shirwadkar * commit. JBD2 calls this function for each fast commit block found in
12765b849b5fSHarshad Shirwadkar * the journal. This function should return JBD2_FC_REPLAY_CONTINUE
12775b849b5fSHarshad Shirwadkar * to indicate that the block was processed correctly and more fast
12785b849b5fSHarshad Shirwadkar * commit replay should continue. Return value of JBD2_FC_REPLAY_STOP
12795b849b5fSHarshad Shirwadkar * indicates the end of replay (no more blocks remaining). A negative
12805b849b5fSHarshad Shirwadkar * return value indicates error.
12815b849b5fSHarshad Shirwadkar */
12825b849b5fSHarshad Shirwadkar int (*j_fc_replay_callback)(struct journal_s *journal,
12835b849b5fSHarshad Shirwadkar struct buffer_head *bh,
12845b849b5fSHarshad Shirwadkar enum passtype pass, int off,
12855b849b5fSHarshad Shirwadkar tid_t expected_commit_id);
128662913ae9STheodore Ts'o
128762913ae9STheodore Ts'o /**
128862913ae9STheodore Ts'o * @j_bmap:
128962913ae9STheodore Ts'o *
129062913ae9STheodore Ts'o * Bmap function that should be used instead of the generic
129162913ae9STheodore Ts'o * VFS bmap function.
129262913ae9STheodore Ts'o */
129362913ae9STheodore Ts'o int (*j_bmap)(struct journal_s *journal, sector_t *block);
1294470decc6SDave Kleikamp };
1295470decc6SDave Kleikamp
12961eaa566dSJan Kara #define jbd2_might_wait_for_commit(j) \
12971eaa566dSJan Kara do { \
12981eaa566dSJan Kara rwsem_acquire(&j->j_trans_commit_map, 0, 0, _THIS_IP_); \
12995facae4fSQian Cai rwsem_release(&j->j_trans_commit_map, _THIS_IP_); \
13001eaa566dSJan Kara } while (0)
13011eaa566dSJan Kara
13025cf036d4SZhang Yi /*
13035cf036d4SZhang Yi * We can support any known requested features iff the
13045cf036d4SZhang Yi * superblock is not in version 1. Otherwise we fail to support any
13055cf036d4SZhang Yi * extended sb features.
13065cf036d4SZhang Yi */
jbd2_format_support_feature(journal_t * j)13075cf036d4SZhang Yi static inline bool jbd2_format_support_feature(journal_t *j)
13085cf036d4SZhang Yi {
13095cf036d4SZhang Yi return j->j_superblock->s_header.h_blocktype !=
13105cf036d4SZhang Yi cpu_to_be32(JBD2_SUPERBLOCK_V1);
13115cf036d4SZhang Yi }
13125cf036d4SZhang Yi
131356316a0dSDarrick J. Wong /* journal feature predicate functions */
131456316a0dSDarrick J. Wong #define JBD2_FEATURE_COMPAT_FUNCS(name, flagname) \
131556316a0dSDarrick J. Wong static inline bool jbd2_has_feature_##name(journal_t *j) \
131656316a0dSDarrick J. Wong { \
13175cf036d4SZhang Yi return (jbd2_format_support_feature(j) && \
131856316a0dSDarrick J. Wong ((j)->j_superblock->s_feature_compat & \
131956316a0dSDarrick J. Wong cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname)) != 0); \
132056316a0dSDarrick J. Wong } \
132156316a0dSDarrick J. Wong static inline void jbd2_set_feature_##name(journal_t *j) \
132256316a0dSDarrick J. Wong { \
132356316a0dSDarrick J. Wong (j)->j_superblock->s_feature_compat |= \
132456316a0dSDarrick J. Wong cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname); \
132556316a0dSDarrick J. Wong } \
132656316a0dSDarrick J. Wong static inline void jbd2_clear_feature_##name(journal_t *j) \
132756316a0dSDarrick J. Wong { \
132856316a0dSDarrick J. Wong (j)->j_superblock->s_feature_compat &= \
132956316a0dSDarrick J. Wong ~cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname); \
133056316a0dSDarrick J. Wong }
133156316a0dSDarrick J. Wong
133256316a0dSDarrick J. Wong #define JBD2_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
133356316a0dSDarrick J. Wong static inline bool jbd2_has_feature_##name(journal_t *j) \
133456316a0dSDarrick J. Wong { \
13355cf036d4SZhang Yi return (jbd2_format_support_feature(j) && \
133656316a0dSDarrick J. Wong ((j)->j_superblock->s_feature_ro_compat & \
133756316a0dSDarrick J. Wong cpu_to_be32(JBD2_FEATURE_RO_COMPAT_##flagname)) != 0); \
133856316a0dSDarrick J. Wong } \
133956316a0dSDarrick J. Wong static inline void jbd2_set_feature_##name(journal_t *j) \
134056316a0dSDarrick J. Wong { \
134156316a0dSDarrick J. Wong (j)->j_superblock->s_feature_ro_compat |= \
134256316a0dSDarrick J. Wong cpu_to_be32(JBD2_FEATURE_RO_COMPAT_##flagname); \
134356316a0dSDarrick J. Wong } \
134456316a0dSDarrick J. Wong static inline void jbd2_clear_feature_##name(journal_t *j) \
134556316a0dSDarrick J. Wong { \
134656316a0dSDarrick J. Wong (j)->j_superblock->s_feature_ro_compat &= \
134756316a0dSDarrick J. Wong ~cpu_to_be32(JBD2_FEATURE_RO_COMPAT_##flagname); \
134856316a0dSDarrick J. Wong }
134956316a0dSDarrick J. Wong
135056316a0dSDarrick J. Wong #define JBD2_FEATURE_INCOMPAT_FUNCS(name, flagname) \
135156316a0dSDarrick J. Wong static inline bool jbd2_has_feature_##name(journal_t *j) \
135256316a0dSDarrick J. Wong { \
13535cf036d4SZhang Yi return (jbd2_format_support_feature(j) && \
135456316a0dSDarrick J. Wong ((j)->j_superblock->s_feature_incompat & \
135556316a0dSDarrick J. Wong cpu_to_be32(JBD2_FEATURE_INCOMPAT_##flagname)) != 0); \
135656316a0dSDarrick J. Wong } \
135756316a0dSDarrick J. Wong static inline void jbd2_set_feature_##name(journal_t *j) \
135856316a0dSDarrick J. Wong { \
135956316a0dSDarrick J. Wong (j)->j_superblock->s_feature_incompat |= \
136056316a0dSDarrick J. Wong cpu_to_be32(JBD2_FEATURE_INCOMPAT_##flagname); \
136156316a0dSDarrick J. Wong } \
136256316a0dSDarrick J. Wong static inline void jbd2_clear_feature_##name(journal_t *j) \
136356316a0dSDarrick J. Wong { \
136456316a0dSDarrick J. Wong (j)->j_superblock->s_feature_incompat &= \
136556316a0dSDarrick J. Wong ~cpu_to_be32(JBD2_FEATURE_INCOMPAT_##flagname); \
136656316a0dSDarrick J. Wong }
136756316a0dSDarrick J. Wong
136856316a0dSDarrick J. Wong JBD2_FEATURE_COMPAT_FUNCS(checksum, CHECKSUM)
136956316a0dSDarrick J. Wong
137056316a0dSDarrick J. Wong JBD2_FEATURE_INCOMPAT_FUNCS(revoke, REVOKE)
137156316a0dSDarrick J. Wong JBD2_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
137256316a0dSDarrick J. Wong JBD2_FEATURE_INCOMPAT_FUNCS(async_commit, ASYNC_COMMIT)
137356316a0dSDarrick J. Wong JBD2_FEATURE_INCOMPAT_FUNCS(csum2, CSUM_V2)
137456316a0dSDarrick J. Wong JBD2_FEATURE_INCOMPAT_FUNCS(csum3, CSUM_V3)
1375995a3ed6SHarshad Shirwadkar JBD2_FEATURE_INCOMPAT_FUNCS(fast_commit, FAST_COMMIT)
137656316a0dSDarrick J. Wong
1377*5c480a69SZhang Yi /* Journal high priority write IO operation flags */
1378*5c480a69SZhang Yi #define JBD2_JOURNAL_REQ_FLAGS (REQ_META | REQ_SYNC | REQ_IDLE)
1379*5c480a69SZhang Yi
1380470decc6SDave Kleikamp /*
1381470decc6SDave Kleikamp * Journal flag definitions
1382470decc6SDave Kleikamp */
1383f7f4bccbSMingming Cao #define JBD2_UNMOUNT 0x001 /* Journal thread is being destroyed */
1384f7f4bccbSMingming Cao #define JBD2_ABORT 0x002 /* Journaling has been aborted for errors. */
1385f7f4bccbSMingming Cao #define JBD2_ACK_ERR 0x004 /* The errno in the sb has been acked */
1386f7f4bccbSMingming Cao #define JBD2_FLUSHED 0x008 /* The journal superblock has been flushed */
1387f7f4bccbSMingming Cao #define JBD2_LOADED 0x010 /* The journal superblock has been loaded */
1388f7f4bccbSMingming Cao #define JBD2_BARRIER 0x020 /* Use IDE barriers */
13895bf5683aSHidehiro Kawai #define JBD2_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file
13905bf5683aSHidehiro Kawai * data write error in ordered
13915bf5683aSHidehiro Kawai * mode */
1392c7fc6055SZhang Yi #define JBD2_CYCLE_RECORD 0x080 /* Journal cycled record log on
1393c7fc6055SZhang Yi * clean and empty filesystem
1394c7fc6055SZhang Yi * logging area */
1395ff780b91SHarshad Shirwadkar #define JBD2_FAST_COMMIT_ONGOING 0x100 /* Fast commit is ongoing */
1396ff780b91SHarshad Shirwadkar #define JBD2_FULL_COMMIT_ONGOING 0x200 /* Full commit is ongoing */
139701d5d965SLeah Rumancik #define JBD2_JOURNAL_FLUSH_DISCARD 0x0001
139801d5d965SLeah Rumancik #define JBD2_JOURNAL_FLUSH_ZEROOUT 0x0002
139901d5d965SLeah Rumancik #define JBD2_JOURNAL_FLUSH_VALID (JBD2_JOURNAL_FLUSH_DISCARD | \
140001d5d965SLeah Rumancik JBD2_JOURNAL_FLUSH_ZEROOUT)
1401470decc6SDave Kleikamp
1402470decc6SDave Kleikamp /*
1403fcf37549SZhang Yi * Journal atomic flag definitions
1404fcf37549SZhang Yi */
1405fcf37549SZhang Yi #define JBD2_CHECKPOINT_IO_ERROR 0x001 /* Detect io error while writing
1406fcf37549SZhang Yi * buffer back to disk */
1407fcf37549SZhang Yi
1408fcf37549SZhang Yi /*
1409470decc6SDave Kleikamp * Function declarations for the journaling transaction and buffer
1410470decc6SDave Kleikamp * management
1411470decc6SDave Kleikamp */
1412470decc6SDave Kleikamp
1413470decc6SDave Kleikamp /* Filing buffers */
1414f7f4bccbSMingming Cao extern void jbd2_journal_unfile_buffer(journal_t *, struct journal_head *);
141593108ebbSJan Kara extern bool __jbd2_journal_refile_buffer(struct journal_head *);
1416f7f4bccbSMingming Cao extern void jbd2_journal_refile_buffer(journal_t *, struct journal_head *);
1417f7f4bccbSMingming Cao extern void __jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int);
1418f7f4bccbSMingming Cao extern void jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int);
jbd2_file_log_bh(struct list_head * head,struct buffer_head * bh)1419f5113effSJan Kara static inline void jbd2_file_log_bh(struct list_head *head, struct buffer_head *bh)
1420f5113effSJan Kara {
1421f5113effSJan Kara list_add_tail(&bh->b_assoc_buffers, head);
1422f5113effSJan Kara }
jbd2_unfile_log_bh(struct buffer_head * bh)1423f5113effSJan Kara static inline void jbd2_unfile_log_bh(struct buffer_head *bh)
1424f5113effSJan Kara {
1425f5113effSJan Kara list_del_init(&bh->b_assoc_buffers);
1426f5113effSJan Kara }
1427470decc6SDave Kleikamp
1428470decc6SDave Kleikamp /* Log buffer allocation */
142932ab6715SJan Kara struct buffer_head *jbd2_journal_get_descriptor_buffer(transaction_t *, int);
14301101cd4dSJan Kara void jbd2_descriptor_block_csum_set(journal_t *, struct buffer_head *);
143118eba7aaSMingming Cao int jbd2_journal_next_log_block(journal_t *, unsigned long long *);
143279feb521SJan Kara int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid,
143379feb521SJan Kara unsigned long *block);
14346f6a6fdaSJoseph Qi int __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block);
14353339578fSJan Kara void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block);
1436470decc6SDave Kleikamp
1437470decc6SDave Kleikamp /* Commit management */
1438f7f4bccbSMingming Cao extern void jbd2_journal_commit_transaction(journal_t *);
1439470decc6SDave Kleikamp
1440470decc6SDave Kleikamp /* Checkpoint list management */
1441841df7dfSJan Kara void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy);
14424ba3fcddSZhang Yi unsigned long jbd2_journal_shrink_checkpoint_list(journal_t *journal, unsigned long *nr_to_scan);
1443f7f4bccbSMingming Cao int __jbd2_journal_remove_checkpoint(struct journal_head *);
144446f881b5SZhang Yi int jbd2_journal_try_remove_checkpoint(struct journal_head *jh);
1445841df7dfSJan Kara void jbd2_journal_destroy_checkpoint(journal_t *journal);
1446f7f4bccbSMingming Cao void __jbd2_journal_insert_checkpoint(struct journal_head *, transaction_t *);
1447470decc6SDave Kleikamp
1448e06c8227SJoel Becker
1449e06c8227SJoel Becker /*
1450e06c8227SJoel Becker * Triggers
1451e06c8227SJoel Becker */
1452e06c8227SJoel Becker
1453e06c8227SJoel Becker struct jbd2_buffer_trigger_type {
1454e06c8227SJoel Becker /*
145513ceef09SJan Kara * Fired a the moment data to write to the journal are known to be
145613ceef09SJan Kara * stable - so either at the moment b_frozen_data is created or just
145713ceef09SJan Kara * before a buffer is written to the journal. mapped_data is a mapped
145813ceef09SJan Kara * buffer that is the frozen data for commit.
1459e06c8227SJoel Becker */
146013ceef09SJan Kara void (*t_frozen)(struct jbd2_buffer_trigger_type *type,
1461e06c8227SJoel Becker struct buffer_head *bh, void *mapped_data,
1462e06c8227SJoel Becker size_t size);
1463e06c8227SJoel Becker
1464e06c8227SJoel Becker /*
1465e06c8227SJoel Becker * Fired during journal abort for dirty buffers that will not be
1466e06c8227SJoel Becker * committed.
1467e06c8227SJoel Becker */
1468e06c8227SJoel Becker void (*t_abort)(struct jbd2_buffer_trigger_type *type,
1469e06c8227SJoel Becker struct buffer_head *bh);
1470e06c8227SJoel Becker };
1471e06c8227SJoel Becker
147213ceef09SJan Kara extern void jbd2_buffer_frozen_trigger(struct journal_head *jh,
1473e06c8227SJoel Becker void *mapped_data,
1474e06c8227SJoel Becker struct jbd2_buffer_trigger_type *triggers);
1475e06c8227SJoel Becker extern void jbd2_buffer_abort_trigger(struct journal_head *jh,
1476e06c8227SJoel Becker struct jbd2_buffer_trigger_type *triggers);
1477e06c8227SJoel Becker
1478470decc6SDave Kleikamp /* Buffer IO */
1479f5113effSJan Kara extern int jbd2_journal_write_metadata_buffer(transaction_t *transaction,
1480470decc6SDave Kleikamp struct journal_head *jh_in,
1481f5113effSJan Kara struct buffer_head **bh_out,
1482f5113effSJan Kara sector_t blocknr);
1483470decc6SDave Kleikamp
14840c2022ecSYongqiang Yang /* Transaction cache support */
14850c2022ecSYongqiang Yang extern void jbd2_journal_destroy_transaction_cache(void);
14860d52154bSChengguang Xu extern int __init jbd2_journal_init_transaction_cache(void);
14870c2022ecSYongqiang Yang extern void jbd2_journal_free_transaction(transaction_t *);
14880c2022ecSYongqiang Yang
1489470decc6SDave Kleikamp /*
1490470decc6SDave Kleikamp * Journal locking.
1491470decc6SDave Kleikamp *
1492470decc6SDave Kleikamp * We need to lock the journal during transaction state changes so that nobody
1493470decc6SDave Kleikamp * ever tries to take a handle on the running transaction while we are in the
1494470decc6SDave Kleikamp * middle of moving it to the commit phase. j_state_lock does this.
1495470decc6SDave Kleikamp *
1496470decc6SDave Kleikamp * Note that the locking is completely interrupt unsafe. We never touch
1497470decc6SDave Kleikamp * journal structures from interrupts.
1498470decc6SDave Kleikamp */
1499470decc6SDave Kleikamp
journal_current_handle(void)1500470decc6SDave Kleikamp static inline handle_t *journal_current_handle(void)
1501470decc6SDave Kleikamp {
1502470decc6SDave Kleikamp return current->journal_info;
1503470decc6SDave Kleikamp }
1504470decc6SDave Kleikamp
1505470decc6SDave Kleikamp /* The journaling code user interface:
1506470decc6SDave Kleikamp *
1507470decc6SDave Kleikamp * Create and destroy handles
1508470decc6SDave Kleikamp * Register buffer modifications against the current transaction.
1509470decc6SDave Kleikamp */
1510470decc6SDave Kleikamp
1511f7f4bccbSMingming Cao extern handle_t *jbd2_journal_start(journal_t *, int nblocks);
15128f7d89f3SJan Kara extern handle_t *jbd2__journal_start(journal_t *, int blocks, int rsv_blocks,
1513fdc3ef88SJan Kara int revoke_records, gfp_t gfp_mask,
1514fdc3ef88SJan Kara unsigned int type, unsigned int line_no);
1515f7f4bccbSMingming Cao extern int jbd2_journal_restart(handle_t *, int nblocks);
1516fdc3ef88SJan Kara extern int jbd2__journal_restart(handle_t *, int nblocks,
1517fdc3ef88SJan Kara int revoke_records, gfp_t gfp_mask);
15188f7d89f3SJan Kara extern int jbd2_journal_start_reserved(handle_t *handle,
15198f7d89f3SJan Kara unsigned int type, unsigned int line_no);
15208f7d89f3SJan Kara extern void jbd2_journal_free_reserved(handle_t *handle);
1521fdc3ef88SJan Kara extern int jbd2_journal_extend(handle_t *handle, int nblocks,
1522fdc3ef88SJan Kara int revoke_records);
1523f7f4bccbSMingming Cao extern int jbd2_journal_get_write_access(handle_t *, struct buffer_head *);
1524f7f4bccbSMingming Cao extern int jbd2_journal_get_create_access (handle_t *, struct buffer_head *);
1525f7f4bccbSMingming Cao extern int jbd2_journal_get_undo_access(handle_t *, struct buffer_head *);
1526e06c8227SJoel Becker void jbd2_journal_set_triggers(struct buffer_head *,
1527e06c8227SJoel Becker struct jbd2_buffer_trigger_type *type);
1528f7f4bccbSMingming Cao extern int jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *);
1529f7f4bccbSMingming Cao extern int jbd2_journal_forget (handle_t *, struct buffer_head *);
1530ccd16945SMatthew Wilcox (Oracle) int jbd2_journal_invalidate_folio(journal_t *, struct folio *,
1531ccd16945SMatthew Wilcox (Oracle) size_t offset, size_t length);
1532c56a6eb0SMatthew Wilcox (Oracle) bool jbd2_journal_try_to_free_buffers(journal_t *journal, struct folio *folio);
1533f7f4bccbSMingming Cao extern int jbd2_journal_stop(handle_t *);
153401d5d965SLeah Rumancik extern int jbd2_journal_flush(journal_t *journal, unsigned int flags);
1535f7f4bccbSMingming Cao extern void jbd2_journal_lock_updates (journal_t *);
1536f7f4bccbSMingming Cao extern void jbd2_journal_unlock_updates (journal_t *);
15374f981868SRitesh Harjani
15384f981868SRitesh Harjani void jbd2_journal_wait_updates(journal_t *);
1539470decc6SDave Kleikamp
1540f7f4bccbSMingming Cao extern journal_t * jbd2_journal_init_dev(struct block_device *bdev,
1541470decc6SDave Kleikamp struct block_device *fs_dev,
154218eba7aaSMingming Cao unsigned long long start, int len, int bsize);
1543f7f4bccbSMingming Cao extern journal_t * jbd2_journal_init_inode (struct inode *);
1544f7f4bccbSMingming Cao extern int jbd2_journal_update_format (journal_t *);
1545f7f4bccbSMingming Cao extern int jbd2_journal_check_used_features
1546470decc6SDave Kleikamp (journal_t *, unsigned long, unsigned long, unsigned long);
1547f7f4bccbSMingming Cao extern int jbd2_journal_check_available_features
1548470decc6SDave Kleikamp (journal_t *, unsigned long, unsigned long, unsigned long);
1549f7f4bccbSMingming Cao extern int jbd2_journal_set_features
1550470decc6SDave Kleikamp (journal_t *, unsigned long, unsigned long, unsigned long);
1551818d276cSGirish Shilamkar extern void jbd2_journal_clear_features
1552818d276cSGirish Shilamkar (journal_t *, unsigned long, unsigned long, unsigned long);
1553f7f4bccbSMingming Cao extern int jbd2_journal_load (journal_t *journal);
155444519fafSHidehiro Kawai extern int jbd2_journal_destroy (journal_t *);
1555f7f4bccbSMingming Cao extern int jbd2_journal_recover (journal_t *journal);
1556f7f4bccbSMingming Cao extern int jbd2_journal_wipe (journal_t *, int);
1557f7f4bccbSMingming Cao extern int jbd2_journal_skip_recovery (journal_t *);
1558d796c52eSTheodore Ts'o extern void jbd2_journal_update_sb_errno(journal_t *);
15596f6a6fdaSJoseph Qi extern int jbd2_journal_update_sb_log_tail (journal_t *, tid_t,
15606669797bSBart Van Assche unsigned long, blk_opf_t);
1561f7f4bccbSMingming Cao extern void jbd2_journal_abort (journal_t *, int);
1562f7f4bccbSMingming Cao extern int jbd2_journal_errno (journal_t *);
1563f7f4bccbSMingming Cao extern void jbd2_journal_ack_err (journal_t *);
1564f7f4bccbSMingming Cao extern int jbd2_journal_clear_err (journal_t *);
156518eba7aaSMingming Cao extern int jbd2_journal_bmap(journal_t *, unsigned long, unsigned long long *);
1566f7f4bccbSMingming Cao extern int jbd2_journal_force_commit(journal_t *);
15679ff86446SDmitry Monakhov extern int jbd2_journal_force_commit_nested(journal_t *);
15686ba0e7dcSRoss Zwisler extern int jbd2_journal_inode_ranged_write(handle_t *handle,
15696ba0e7dcSRoss Zwisler struct jbd2_inode *inode, loff_t start_byte,
15706ba0e7dcSRoss Zwisler loff_t length);
15716ba0e7dcSRoss Zwisler extern int jbd2_journal_inode_ranged_wait(handle_t *handle,
15726ba0e7dcSRoss Zwisler struct jbd2_inode *inode, loff_t start_byte,
15736ba0e7dcSRoss Zwisler loff_t length);
1574aa3c0c61SMauricio Faria de Oliveira extern int jbd2_journal_finish_inode_data_buffers(
1575aa3c0c61SMauricio Faria de Oliveira struct jbd2_inode *jinode);
15767f5aa215SJan Kara extern int jbd2_journal_begin_ordered_truncate(journal_t *journal,
15777f5aa215SJan Kara struct jbd2_inode *inode, loff_t new_size);
1578c851ed54SJan Kara extern void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode);
1579c851ed54SJan Kara extern void jbd2_journal_release_jbd_inode(journal_t *journal, struct jbd2_inode *jinode);
1580470decc6SDave Kleikamp
1581470decc6SDave Kleikamp /*
1582470decc6SDave Kleikamp * journal_head management
1583470decc6SDave Kleikamp */
1584f7f4bccbSMingming Cao struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh);
1585f7f4bccbSMingming Cao struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh);
1586f7f4bccbSMingming Cao void jbd2_journal_put_journal_head(struct journal_head *jh);
1587470decc6SDave Kleikamp
1588470decc6SDave Kleikamp /*
1589470decc6SDave Kleikamp * handle management
1590470decc6SDave Kleikamp */
1591e18b890bSChristoph Lameter extern struct kmem_cache *jbd2_handle_cache;
1592470decc6SDave Kleikamp
jbd2_alloc_handle(gfp_t gfp_flags)1593af1e76d6SMingming Cao static inline handle_t *jbd2_alloc_handle(gfp_t gfp_flags)
1594470decc6SDave Kleikamp {
159528daf4faSZheng Liu return kmem_cache_zalloc(jbd2_handle_cache, gfp_flags);
1596470decc6SDave Kleikamp }
1597470decc6SDave Kleikamp
jbd2_free_handle(handle_t * handle)1598af1e76d6SMingming Cao static inline void jbd2_free_handle(handle_t *handle)
1599470decc6SDave Kleikamp {
1600f7f4bccbSMingming Cao kmem_cache_free(jbd2_handle_cache, handle);
1601470decc6SDave Kleikamp }
1602470decc6SDave Kleikamp
16038aefcd55STheodore Ts'o /*
16048aefcd55STheodore Ts'o * jbd2_inode management (optional, for those file systems that want to use
16058aefcd55STheodore Ts'o * dynamically allocated jbd2_inode structures)
16068aefcd55STheodore Ts'o */
16078aefcd55STheodore Ts'o extern struct kmem_cache *jbd2_inode_cache;
16088aefcd55STheodore Ts'o
jbd2_alloc_inode(gfp_t gfp_flags)16098aefcd55STheodore Ts'o static inline struct jbd2_inode *jbd2_alloc_inode(gfp_t gfp_flags)
16108aefcd55STheodore Ts'o {
16118aefcd55STheodore Ts'o return kmem_cache_alloc(jbd2_inode_cache, gfp_flags);
16128aefcd55STheodore Ts'o }
16138aefcd55STheodore Ts'o
jbd2_free_inode(struct jbd2_inode * jinode)16148aefcd55STheodore Ts'o static inline void jbd2_free_inode(struct jbd2_inode *jinode)
16158aefcd55STheodore Ts'o {
16168aefcd55STheodore Ts'o kmem_cache_free(jbd2_inode_cache, jinode);
16178aefcd55STheodore Ts'o }
16188aefcd55STheodore Ts'o
1619470decc6SDave Kleikamp /* Primary revoke support */
1620470decc6SDave Kleikamp #define JOURNAL_REVOKE_DEFAULT_HASH 256
1621f7f4bccbSMingming Cao extern int jbd2_journal_init_revoke(journal_t *, int);
16220d52154bSChengguang Xu extern void jbd2_journal_destroy_revoke_record_cache(void);
16230d52154bSChengguang Xu extern void jbd2_journal_destroy_revoke_table_cache(void);
16240d52154bSChengguang Xu extern int __init jbd2_journal_init_revoke_record_cache(void);
16250d52154bSChengguang Xu extern int __init jbd2_journal_init_revoke_table_cache(void);
1626470decc6SDave Kleikamp
1627f7f4bccbSMingming Cao extern void jbd2_journal_destroy_revoke(journal_t *);
162818eba7aaSMingming Cao extern int jbd2_journal_revoke (handle_t *, unsigned long long, struct buffer_head *);
1629f7f4bccbSMingming Cao extern int jbd2_journal_cancel_revoke(handle_t *, struct journal_head *);
16309bcf976cSJan Kara extern void jbd2_journal_write_revoke_records(transaction_t *transaction,
16319bcf976cSJan Kara struct list_head *log_bufs);
1632470decc6SDave Kleikamp
1633470decc6SDave Kleikamp /* Recovery revoke support */
163418eba7aaSMingming Cao extern int jbd2_journal_set_revoke(journal_t *, unsigned long long, tid_t);
163518eba7aaSMingming Cao extern int jbd2_journal_test_revoke(journal_t *, unsigned long long, tid_t);
1636f7f4bccbSMingming Cao extern void jbd2_journal_clear_revoke(journal_t *);
1637f7f4bccbSMingming Cao extern void jbd2_journal_switch_revoke_table(journal_t *journal);
16381ba37268SYongqiang Yang extern void jbd2_clear_buffer_revoked_flags(journal_t *journal);
1639470decc6SDave Kleikamp
1640470decc6SDave Kleikamp /*
1641470decc6SDave Kleikamp * The log thread user interface:
1642470decc6SDave Kleikamp *
1643470decc6SDave Kleikamp * Request space in the current transaction, and force transaction commit
1644470decc6SDave Kleikamp * transitions on demand.
1645470decc6SDave Kleikamp */
1646470decc6SDave Kleikamp
1647f7f4bccbSMingming Cao int jbd2_log_start_commit(journal_t *journal, tid_t tid);
1648f7f4bccbSMingming Cao int jbd2_journal_start_commit(journal_t *journal, tid_t *tid);
1649f7f4bccbSMingming Cao int jbd2_log_wait_commit(journal_t *journal, tid_t tid);
1650b8a6176cSJan Kara int jbd2_transaction_committed(journal_t *journal, tid_t tid);
1651d76a3a77STheodore Ts'o int jbd2_complete_transaction(journal_t *journal, tid_t tid);
1652f7f4bccbSMingming Cao int jbd2_log_do_checkpoint(journal_t *journal);
1653bbd2be36SJan Kara int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid);
1654470decc6SDave Kleikamp
1655f7f4bccbSMingming Cao void __jbd2_log_wait_for_space(journal_t *journal);
1656f7f4bccbSMingming Cao extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *);
1657f7f4bccbSMingming Cao extern int jbd2_cleanup_journal_tail(journal_t *);
1658470decc6SDave Kleikamp
16596866d7b3SHarshad Shirwadkar /* Fast commit related APIs */
1660ff780b91SHarshad Shirwadkar int jbd2_fc_begin_commit(journal_t *journal, tid_t tid);
1661ff780b91SHarshad Shirwadkar int jbd2_fc_end_commit(journal_t *journal);
16620bce577bSHarshad Shirwadkar int jbd2_fc_end_commit_fallback(journal_t *journal);
1663ff780b91SHarshad Shirwadkar int jbd2_fc_get_buf(journal_t *journal, struct buffer_head **bh_out);
1664f30ff35fSJan Kara int jbd2_submit_inode_data(journal_t *journal, struct jbd2_inode *jinode);
1665ff780b91SHarshad Shirwadkar int jbd2_wait_inode_data(journal_t *journal, struct jbd2_inode *jinode);
1666ff780b91SHarshad Shirwadkar int jbd2_fc_wait_bufs(journal_t *journal, int num_blks);
1667ff780b91SHarshad Shirwadkar int jbd2_fc_release_bufs(journal_t *journal);
1668ff780b91SHarshad Shirwadkar
jbd2_journal_get_max_txn_bufs(journal_t * journal)1669ede7dc7fSHarshad Shirwadkar static inline int jbd2_journal_get_max_txn_bufs(journal_t *journal)
1670ede7dc7fSHarshad Shirwadkar {
1671ede7dc7fSHarshad Shirwadkar return (journal->j_total_len - journal->j_fc_wbufsize) / 4;
1672ede7dc7fSHarshad Shirwadkar }
1673ede7dc7fSHarshad Shirwadkar
1674470decc6SDave Kleikamp /*
1675470decc6SDave Kleikamp * is_journal_abort
1676470decc6SDave Kleikamp *
1677f7f4bccbSMingming Cao * Simple test wrapper function to test the JBD2_ABORT state flag. This
1678470decc6SDave Kleikamp * bit, when set, indicates that we have had a fatal error somewhere,
1679470decc6SDave Kleikamp * either inside the journaling layer or indicated to us by the client
1680470decc6SDave Kleikamp * (eg. ext3), and that we and should not commit any further
1681470decc6SDave Kleikamp * transactions.
1682470decc6SDave Kleikamp */
1683470decc6SDave Kleikamp
is_journal_aborted(journal_t * journal)1684470decc6SDave Kleikamp static inline int is_journal_aborted(journal_t *journal)
1685470decc6SDave Kleikamp {
1686f7f4bccbSMingming Cao return journal->j_flags & JBD2_ABORT;
1687470decc6SDave Kleikamp }
1688470decc6SDave Kleikamp
is_handle_aborted(handle_t * handle)1689470decc6SDave Kleikamp static inline int is_handle_aborted(handle_t *handle)
1690470decc6SDave Kleikamp {
169141a5b913STheodore Ts'o if (handle->h_aborted || !handle->h_transaction)
1692470decc6SDave Kleikamp return 1;
1693470decc6SDave Kleikamp return is_journal_aborted(handle->h_transaction->t_journal);
1694470decc6SDave Kleikamp }
1695470decc6SDave Kleikamp
jbd2_journal_abort_handle(handle_t * handle)1696f7f4bccbSMingming Cao static inline void jbd2_journal_abort_handle(handle_t *handle)
1697470decc6SDave Kleikamp {
1698470decc6SDave Kleikamp handle->h_aborted = 1;
1699470decc6SDave Kleikamp }
1700470decc6SDave Kleikamp
1701470decc6SDave Kleikamp #endif /* __KERNEL__ */
1702470decc6SDave Kleikamp
1703470decc6SDave Kleikamp /* Comparison functions for transaction IDs: perform comparisons using
1704470decc6SDave Kleikamp * modulo arithmetic so that they work over sequence number wraps. */
1705470decc6SDave Kleikamp
tid_gt(tid_t x,tid_t y)1706470decc6SDave Kleikamp static inline int tid_gt(tid_t x, tid_t y)
1707470decc6SDave Kleikamp {
1708470decc6SDave Kleikamp int difference = (x - y);
1709470decc6SDave Kleikamp return (difference > 0);
1710470decc6SDave Kleikamp }
1711470decc6SDave Kleikamp
tid_geq(tid_t x,tid_t y)1712470decc6SDave Kleikamp static inline int tid_geq(tid_t x, tid_t y)
1713470decc6SDave Kleikamp {
1714470decc6SDave Kleikamp int difference = (x - y);
1715470decc6SDave Kleikamp return (difference >= 0);
1716470decc6SDave Kleikamp }
1717470decc6SDave Kleikamp
1718f7f4bccbSMingming Cao extern int jbd2_journal_blocks_per_page(struct inode *inode);
1719b517bea1SZach Brown extern size_t journal_tag_bytes(journal_t *journal);
1720470decc6SDave Kleikamp
jbd2_journal_has_csum_v2or3_feature(journal_t * j)17218595798cSDarrick J. Wong static inline bool jbd2_journal_has_csum_v2or3_feature(journal_t *j)
17228595798cSDarrick J. Wong {
172356316a0dSDarrick J. Wong return jbd2_has_feature_csum2(j) || jbd2_has_feature_csum3(j);
17248595798cSDarrick J. Wong }
17258595798cSDarrick J. Wong
jbd2_journal_has_csum_v2or3(journal_t * journal)1726db9ee220SDarrick J. Wong static inline int jbd2_journal_has_csum_v2or3(journal_t *journal)
1727db9ee220SDarrick J. Wong {
17288595798cSDarrick J. Wong WARN_ON_ONCE(jbd2_journal_has_csum_v2or3_feature(journal) &&
17298595798cSDarrick J. Wong journal->j_chksum_driver == NULL);
1730db9ee220SDarrick J. Wong
17318595798cSDarrick J. Wong return journal->j_chksum_driver != NULL;
1732db9ee220SDarrick J. Wong }
1733db9ee220SDarrick J. Wong
jbd2_journal_get_num_fc_blks(journal_superblock_t * jsb)17349bd23c31SHarshad Shirwadkar static inline int jbd2_journal_get_num_fc_blks(journal_superblock_t *jsb)
17359bd23c31SHarshad Shirwadkar {
17369bd23c31SHarshad Shirwadkar int num_fc_blocks = be32_to_cpu(jsb->s_num_fc_blks);
17379bd23c31SHarshad Shirwadkar
17389bd23c31SHarshad Shirwadkar return num_fc_blocks ? num_fc_blocks : JBD2_DEFAULT_FAST_COMMIT_BLOCKS;
17399bd23c31SHarshad Shirwadkar }
17409bd23c31SHarshad Shirwadkar
1741470decc6SDave Kleikamp /*
174276c39904SJan Kara * Return number of free blocks in the log. Must be called under j_state_lock.
174376c39904SJan Kara */
jbd2_log_space_left(journal_t * journal)174476c39904SJan Kara static inline unsigned long jbd2_log_space_left(journal_t *journal)
174576c39904SJan Kara {
174676c39904SJan Kara /* Allow for rounding errors */
1747add3efddSJan Kara long free = journal->j_free - 32;
174876c39904SJan Kara
174976c39904SJan Kara if (journal->j_committing_transaction) {
17509f356e5aSJan Kara free -= atomic_read(&journal->
175176c39904SJan Kara j_committing_transaction->t_outstanding_credits);
175276c39904SJan Kara }
1753add3efddSJan Kara return max_t(long, free, 0);
1754470decc6SDave Kleikamp }
1755470decc6SDave Kleikamp
1756470decc6SDave Kleikamp /*
1757470decc6SDave Kleikamp * Definitions which augment the buffer_head layer
1758470decc6SDave Kleikamp */
1759470decc6SDave Kleikamp
1760470decc6SDave Kleikamp /* journaling buffer types */
1761470decc6SDave Kleikamp #define BJ_None 0 /* Not journaled */
176287c89c23SJan Kara #define BJ_Metadata 1 /* Normal journaled metadata */
176387c89c23SJan Kara #define BJ_Forget 2 /* Buffer superseded by this transaction */
1764f5113effSJan Kara #define BJ_Shadow 3 /* Buffer contents being shadowed to the log */
1765e5a120aeSJan Kara #define BJ_Reserved 4 /* Buffer is reserved for access by journal */
1766e5a120aeSJan Kara #define BJ_Types 5
1767470decc6SDave Kleikamp
1768fd47d3e1SBehan Webster /* JBD uses a CRC32 checksum */
1769fd47d3e1SBehan Webster #define JBD_MAX_CHECKSUM_SIZE 4
1770fd47d3e1SBehan Webster
jbd2_chksum(journal_t * journal,u32 crc,const void * address,unsigned int length)177101b5adceSDarrick J. Wong static inline u32 jbd2_chksum(journal_t *journal, u32 crc,
177201b5adceSDarrick J. Wong const void *address, unsigned int length)
177301b5adceSDarrick J. Wong {
177401b5adceSDarrick J. Wong struct {
177501b5adceSDarrick J. Wong struct shash_desc shash;
1776fd47d3e1SBehan Webster char ctx[JBD_MAX_CHECKSUM_SIZE];
177701b5adceSDarrick J. Wong } desc;
177801b5adceSDarrick J. Wong int err;
177901b5adceSDarrick J. Wong
1780fd47d3e1SBehan Webster BUG_ON(crypto_shash_descsize(journal->j_chksum_driver) >
1781fd47d3e1SBehan Webster JBD_MAX_CHECKSUM_SIZE);
1782fd47d3e1SBehan Webster
178301b5adceSDarrick J. Wong desc.shash.tfm = journal->j_chksum_driver;
178401b5adceSDarrick J. Wong *(u32 *)desc.ctx = crc;
178501b5adceSDarrick J. Wong
178601b5adceSDarrick J. Wong err = crypto_shash_update(&desc.shash, address, length);
178701b5adceSDarrick J. Wong BUG_ON(err);
178801b5adceSDarrick J. Wong
178901b5adceSDarrick J. Wong return *(u32 *)desc.ctx;
179001b5adceSDarrick J. Wong }
179101b5adceSDarrick J. Wong
179206a407f1SDmitry Monakhov /* Return most recent uncommitted transaction */
jbd2_get_latest_transaction(journal_t * journal)179306a407f1SDmitry Monakhov static inline tid_t jbd2_get_latest_transaction(journal_t *journal)
179406a407f1SDmitry Monakhov {
179506a407f1SDmitry Monakhov tid_t tid;
179606a407f1SDmitry Monakhov
179706a407f1SDmitry Monakhov read_lock(&journal->j_state_lock);
179806a407f1SDmitry Monakhov tid = journal->j_commit_request;
179906a407f1SDmitry Monakhov if (journal->j_running_transaction)
180006a407f1SDmitry Monakhov tid = journal->j_running_transaction->t_tid;
180106a407f1SDmitry Monakhov read_unlock(&journal->j_state_lock);
180206a407f1SDmitry Monakhov return tid;
180306a407f1SDmitry Monakhov }
180406a407f1SDmitry Monakhov
jbd2_handle_buffer_credits(handle_t * handle)1805a9a8344eSJan Kara static inline int jbd2_handle_buffer_credits(handle_t *handle)
1806a9a8344eSJan Kara {
18073c845acdSJan Kara journal_t *journal;
18083c845acdSJan Kara
18093c845acdSJan Kara if (!handle->h_reserved)
18103c845acdSJan Kara journal = handle->h_transaction->t_journal;
18113c845acdSJan Kara else
18123c845acdSJan Kara journal = handle->h_journal;
1813fdc3ef88SJan Kara
1814933f1c1eSJan Kara return handle->h_total_credits -
1815fdc3ef88SJan Kara DIV_ROUND_UP(handle->h_revoke_credits_requested,
1816fdc3ef88SJan Kara journal->j_revoke_records_per_block);
1817a9a8344eSJan Kara }
1818a9a8344eSJan Kara
1819470decc6SDave Kleikamp #ifdef __KERNEL__
1820470decc6SDave Kleikamp
1821470decc6SDave Kleikamp #define buffer_trace_init(bh) do {} while (0)
1822470decc6SDave Kleikamp #define print_buffer_fields(bh) do {} while (0)
1823470decc6SDave Kleikamp #define print_buffer_trace(bh) do {} while (0)
1824470decc6SDave Kleikamp #define BUFFER_TRACE(bh, info) do {} while (0)
1825470decc6SDave Kleikamp #define BUFFER_TRACE2(bh, bh2, info) do {} while (0)
1826470decc6SDave Kleikamp #define JBUFFER_TRACE(jh, info) do {} while (0)
1827470decc6SDave Kleikamp
1828470decc6SDave Kleikamp #endif /* __KERNEL__ */
1829470decc6SDave Kleikamp
18306a797d27SDarrick J. Wong #define EFSBADCRC EBADMSG /* Bad CRC detected */
18316a797d27SDarrick J. Wong #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
18326a797d27SDarrick J. Wong
1833cd02ff0bSMingming Cao #endif /* _LINUX_JBD2_H */
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