]> bbs.cooldavid.org Git - net-next-2.6.git/blame - include/linux/jbd2.h
jbd2: improve jbd2 fsync batching
[net-next-2.6.git] / include / linux / jbd2.h
CommitLineData
470decc6 1/*
f7f4bccb 2 * linux/include/linux/jbd2.h
470decc6
DK
3 *
4 * Written by Stephen C. Tweedie <sct@redhat.com>
5 *
6 * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved
7 *
8 * This file is part of the Linux kernel and is made available under
9 * the terms of the GNU General Public License, version 2, or at your
10 * option, any later version, incorporated herein by reference.
11 *
12 * Definitions for transaction data structures for the buffer cache
13 * filesystem journaling support.
14 */
15
cd02ff0b
MC
16#ifndef _LINUX_JBD2_H
17#define _LINUX_JBD2_H
470decc6
DK
18
19/* Allow this file to be included directly into e2fsprogs */
20#ifndef __KERNEL__
21#include "jfs_compat.h"
f7f4bccb 22#define JBD2_DEBUG
470decc6
DK
23#define jfs_debug jbd_debug
24#else
25
26#include <linux/types.h>
27#include <linux/buffer_head.h>
28#include <linux/journal-head.h>
29#include <linux/stddef.h>
30#include <linux/bit_spinlock.h>
31#include <linux/mutex.h>
32#include <linux/timer.h>
470decc6
DK
33#endif
34
35#define journal_oom_retry 1
36
37/*
cd02ff0b 38 * Define JBD2_PARANIOD_IOFAIL to cause a kernel BUG() if ext4 finds
470decc6 39 * certain classes of error which can occur due to failed IOs. Under
cd02ff0b 40 * normal use we want ext4 to continue after such errors, because
470decc6
DK
41 * hardware _can_ fail, but for debugging purposes when running tests on
42 * known-good hardware we may want to trap these errors.
43 */
cd02ff0b 44#undef JBD2_PARANOID_IOFAIL
470decc6
DK
45
46/*
47 * The default maximum commit age, in seconds.
48 */
cd02ff0b 49#define JBD2_DEFAULT_MAX_COMMIT_AGE 5
470decc6 50
e23291b9 51#ifdef CONFIG_JBD2_DEBUG
470decc6 52/*
cd02ff0b 53 * Define JBD2_EXPENSIVE_CHECKING to enable more expensive internal
470decc6 54 * consistency checks. By default we don't do this unless
e23291b9 55 * CONFIG_JBD2_DEBUG is on.
470decc6 56 */
cd02ff0b 57#define JBD2_EXPENSIVE_CHECKING
0f49d5d0 58extern u8 jbd2_journal_enable_debug;
470decc6
DK
59
60#define jbd_debug(n, f, a...) \
61 do { \
f7f4bccb 62 if ((n) <= jbd2_journal_enable_debug) { \
470decc6 63 printk (KERN_DEBUG "(%s, %d): %s: ", \
d5c003b4 64 __FILE__, __LINE__, __func__); \
470decc6
DK
65 printk (f, ## a); \
66 } \
67 } while (0)
68#else
69#define jbd_debug(f, a...) /**/
70#endif
71
af1e76d6
MC
72static inline void *jbd2_alloc(size_t size, gfp_t flags)
73{
74 return (void *)__get_free_pages(flags, get_order(size));
75}
76
77static inline void jbd2_free(void *ptr, size_t size)
78{
79 free_pages((unsigned long)ptr, get_order(size));
80};
81
f7f4bccb 82#define JBD2_MIN_JOURNAL_BLOCKS 1024
470decc6
DK
83
84#ifdef __KERNEL__
85
86/**
87 * typedef handle_t - The handle_t type represents a single atomic update being performed by some process.
88 *
89 * All filesystem modifications made by the process go
90 * through this handle. Recursive operations (such as quota operations)
91 * are gathered into a single update.
92 *
93 * The buffer credits field is used to account for journaled buffers
94 * being modified by the running process. To ensure that there is
95 * enough log space for all outstanding operations, we need to limit the
96 * number of outstanding buffers possible at any time. When the
97 * operation completes, any buffer credits not used are credited back to
98 * the transaction, so that at all times we know how many buffers the
99 * outstanding updates on a transaction might possibly touch.
100 *
101 * This is an opaque datatype.
102 **/
103typedef struct handle_s handle_t; /* Atomic operation type */
104
105
106/**
107 * typedef journal_t - The journal_t maintains all of the journaling state information for a single filesystem.
108 *
109 * journal_t is linked to from the fs superblock structure.
110 *
111 * We use the journal_t to keep track of all outstanding transaction
112 * activity on the filesystem, and to manage the state of the log
113 * writing process.
114 *
115 * This is an opaque datatype.
116 **/
117typedef struct journal_s journal_t; /* Journal control structure */
118#endif
119
120/*
121 * Internal structures used by the logging mechanism:
122 */
123
f7f4bccb 124#define JBD2_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */
470decc6
DK
125
126/*
127 * On-disk structures
128 */
129
130/*
131 * Descriptor block types:
132 */
133
f7f4bccb
MC
134#define JBD2_DESCRIPTOR_BLOCK 1
135#define JBD2_COMMIT_BLOCK 2
136#define JBD2_SUPERBLOCK_V1 3
137#define JBD2_SUPERBLOCK_V2 4
138#define JBD2_REVOKE_BLOCK 5
470decc6
DK
139
140/*
141 * Standard header for all descriptor blocks:
142 */
143typedef struct journal_header_s
144{
145 __be32 h_magic;
146 __be32 h_blocktype;
147 __be32 h_sequence;
148} journal_header_t;
149
818d276c
GS
150/*
151 * Checksum types.
152 */
153#define JBD2_CRC32_CHKSUM 1
154#define JBD2_MD5_CHKSUM 2
155#define JBD2_SHA1_CHKSUM 3
156
157#define JBD2_CRC32_CHKSUM_SIZE 4
158
159#define JBD2_CHECKSUM_BYTES (32 / sizeof(u32))
160/*
161 * Commit block header for storing transactional checksums:
162 */
163struct commit_header {
164 __be32 h_magic;
165 __be32 h_blocktype;
166 __be32 h_sequence;
167 unsigned char h_chksum_type;
168 unsigned char h_chksum_size;
169 unsigned char h_padding[2];
170 __be32 h_chksum[JBD2_CHECKSUM_BYTES];
736603ab
TT
171 __be64 h_commit_sec;
172 __be32 h_commit_nsec;
818d276c 173};
470decc6
DK
174
175/*
b517bea1
ZB
176 * The block tag: used to describe a single buffer in the journal.
177 * t_blocknr_high is only used if INCOMPAT_64BIT is set, so this
178 * raw struct shouldn't be used for pointer math or sizeof() - use
179 * journal_tag_bytes(journal) instead to compute this.
470decc6
DK
180 */
181typedef struct journal_block_tag_s
182{
183 __be32 t_blocknr; /* The on-disk block number */
184 __be32 t_flags; /* See below */
b517bea1 185 __be32 t_blocknr_high; /* most-significant high 32bits. */
470decc6
DK
186} journal_block_tag_t;
187
cd02ff0b
MC
188#define JBD2_TAG_SIZE32 (offsetof(journal_block_tag_t, t_blocknr_high))
189#define JBD2_TAG_SIZE64 (sizeof(journal_block_tag_t))
b517bea1 190
470decc6
DK
191/*
192 * The revoke descriptor: used on disk to describe a series of blocks to
193 * be revoked from the log
194 */
f7f4bccb 195typedef struct jbd2_journal_revoke_header_s
470decc6
DK
196{
197 journal_header_t r_header;
198 __be32 r_count; /* Count of bytes used in the block */
f7f4bccb 199} jbd2_journal_revoke_header_t;
470decc6
DK
200
201
202/* Definitions for the journal tag flags word: */
f7f4bccb
MC
203#define JBD2_FLAG_ESCAPE 1 /* on-disk block is escaped */
204#define JBD2_FLAG_SAME_UUID 2 /* block has same uuid as previous */
205#define JBD2_FLAG_DELETED 4 /* block deleted by this transaction */
206#define JBD2_FLAG_LAST_TAG 8 /* last tag in this descriptor block */
470decc6
DK
207
208
209/*
210 * The journal superblock. All fields are in big-endian byte order.
211 */
212typedef struct journal_superblock_s
213{
214/* 0x0000 */
215 journal_header_t s_header;
216
217/* 0x000C */
218 /* Static information describing the journal */
219 __be32 s_blocksize; /* journal device blocksize */
220 __be32 s_maxlen; /* total blocks in journal file */
221 __be32 s_first; /* first block of log information */
222
223/* 0x0018 */
224 /* Dynamic information describing the current state of the log */
225 __be32 s_sequence; /* first commit ID expected in log */
226 __be32 s_start; /* blocknr of start of log */
227
228/* 0x0020 */
f7f4bccb 229 /* Error value, as set by jbd2_journal_abort(). */
470decc6
DK
230 __be32 s_errno;
231
232/* 0x0024 */
233 /* Remaining fields are only valid in a version-2 superblock */
234 __be32 s_feature_compat; /* compatible feature set */
235 __be32 s_feature_incompat; /* incompatible feature set */
236 __be32 s_feature_ro_compat; /* readonly-compatible feature set */
237/* 0x0030 */
238 __u8 s_uuid[16]; /* 128-bit uuid for journal */
239
240/* 0x0040 */
241 __be32 s_nr_users; /* Nr of filesystems sharing log */
242
243 __be32 s_dynsuper; /* Blocknr of dynamic superblock copy*/
244
245/* 0x0048 */
246 __be32 s_max_transaction; /* Limit of journal blocks per trans.*/
247 __be32 s_max_trans_data; /* Limit of data blocks per trans. */
248
249/* 0x0050 */
250 __u32 s_padding[44];
251
252/* 0x0100 */
253 __u8 s_users[16*48]; /* ids of all fs'es sharing the log */
254/* 0x0400 */
255} journal_superblock_t;
256
f7f4bccb 257#define JBD2_HAS_COMPAT_FEATURE(j,mask) \
470decc6
DK
258 ((j)->j_format_version >= 2 && \
259 ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask))))
f7f4bccb 260#define JBD2_HAS_RO_COMPAT_FEATURE(j,mask) \
470decc6
DK
261 ((j)->j_format_version >= 2 && \
262 ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask))))
f7f4bccb 263#define JBD2_HAS_INCOMPAT_FEATURE(j,mask) \
470decc6
DK
264 ((j)->j_format_version >= 2 && \
265 ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask))))
266
818d276c
GS
267#define JBD2_FEATURE_COMPAT_CHECKSUM 0x00000001
268
269#define JBD2_FEATURE_INCOMPAT_REVOKE 0x00000001
270#define JBD2_FEATURE_INCOMPAT_64BIT 0x00000002
271#define JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT 0x00000004
470decc6
DK
272
273/* Features known to this kernel version: */
818d276c 274#define JBD2_KNOWN_COMPAT_FEATURES JBD2_FEATURE_COMPAT_CHECKSUM
f7f4bccb 275#define JBD2_KNOWN_ROCOMPAT_FEATURES 0
b517bea1 276#define JBD2_KNOWN_INCOMPAT_FEATURES (JBD2_FEATURE_INCOMPAT_REVOKE | \
818d276c
GS
277 JBD2_FEATURE_INCOMPAT_64BIT | \
278 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)
470decc6
DK
279
280#ifdef __KERNEL__
281
282#include <linux/fs.h>
283#include <linux/sched.h>
284
36df53f4 285#define J_ASSERT(assert) BUG_ON(!(assert))
470decc6
DK
286
287#if defined(CONFIG_BUFFER_DEBUG)
288void buffer_assertion_failure(struct buffer_head *bh);
289#define J_ASSERT_BH(bh, expr) \
290 do { \
291 if (!(expr)) \
292 buffer_assertion_failure(bh); \
293 J_ASSERT(expr); \
294 } while (0)
295#define J_ASSERT_JH(jh, expr) J_ASSERT_BH(jh2bh(jh), expr)
296#else
297#define J_ASSERT_BH(bh, expr) J_ASSERT(expr)
298#define J_ASSERT_JH(jh, expr) J_ASSERT(expr)
299#endif
300
cd02ff0b 301#if defined(JBD2_PARANOID_IOFAIL)
470decc6
DK
302#define J_EXPECT(expr, why...) J_ASSERT(expr)
303#define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr)
304#define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr)
305#else
306#define __journal_expect(expr, why...) \
307 ({ \
308 int val = (expr); \
309 if (!val) { \
310 printk(KERN_ERR \
311 "EXT3-fs unexpected failure: %s;\n",# expr); \
312 printk(KERN_ERR why "\n"); \
313 } \
314 val; \
315 })
316#define J_EXPECT(expr, why...) __journal_expect(expr, ## why)
317#define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why)
318#define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why)
319#endif
320
321enum jbd_state_bits {
322 BH_JBD /* Has an attached ext3 journal_head */
323 = BH_PrivateStart,
324 BH_JWrite, /* Being written to log (@@@ DEBUGGING) */
325 BH_Freed, /* Has been freed (truncated) */
326 BH_Revoked, /* Has been revoked from the log */
327 BH_RevokeValid, /* Revoked flag is valid */
328 BH_JBDDirty, /* Is dirty but journaled */
329 BH_State, /* Pins most journal_head state */
330 BH_JournalHead, /* Pins bh->b_private and jh->b_bh */
331 BH_Unshadow, /* Dummy bit, for BJ_Shadow wakeup filtering */
171bbfbe 332 BH_JBDPrivateStart, /* First bit available for private use by FS */
470decc6
DK
333};
334
335BUFFER_FNS(JBD, jbd)
336BUFFER_FNS(JWrite, jwrite)
337BUFFER_FNS(JBDDirty, jbddirty)
338TAS_BUFFER_FNS(JBDDirty, jbddirty)
339BUFFER_FNS(Revoked, revoked)
340TAS_BUFFER_FNS(Revoked, revoked)
341BUFFER_FNS(RevokeValid, revokevalid)
342TAS_BUFFER_FNS(RevokeValid, revokevalid)
343BUFFER_FNS(Freed, freed)
344
345static inline struct buffer_head *jh2bh(struct journal_head *jh)
346{
347 return jh->b_bh;
348}
349
350static inline struct journal_head *bh2jh(struct buffer_head *bh)
351{
352 return bh->b_private;
353}
354
355static inline void jbd_lock_bh_state(struct buffer_head *bh)
356{
357 bit_spin_lock(BH_State, &bh->b_state);
358}
359
360static inline int jbd_trylock_bh_state(struct buffer_head *bh)
361{
362 return bit_spin_trylock(BH_State, &bh->b_state);
363}
364
365static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
366{
367 return bit_spin_is_locked(BH_State, &bh->b_state);
368}
369
370static inline void jbd_unlock_bh_state(struct buffer_head *bh)
371{
372 bit_spin_unlock(BH_State, &bh->b_state);
373}
374
375static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
376{
377 bit_spin_lock(BH_JournalHead, &bh->b_state);
378}
379
380static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
381{
382 bit_spin_unlock(BH_JournalHead, &bh->b_state);
383}
384
c851ed54
JK
385/* Flags in jbd_inode->i_flags */
386#define __JI_COMMIT_RUNNING 0
387/* Commit of the inode data in progress. We use this flag to protect us from
388 * concurrent deletion of inode. We cannot use reference to inode for this
389 * since we cannot afford doing last iput() on behalf of kjournald
390 */
391#define JI_COMMIT_RUNNING (1 << __JI_COMMIT_RUNNING)
392
393/**
394 * struct jbd_inode is the structure linking inodes in ordered mode
395 * present in a transaction so that we can sync them during commit.
396 */
397struct jbd2_inode {
398 /* Which transaction does this inode belong to? Either the running
399 * transaction or the committing one. [j_list_lock] */
400 transaction_t *i_transaction;
401
402 /* Pointer to the running transaction modifying inode's data in case
403 * there is already a committing transaction touching it. [j_list_lock] */
404 transaction_t *i_next_transaction;
405
406 /* List of inodes in the i_transaction [j_list_lock] */
407 struct list_head i_list;
408
409 /* VFS inode this inode belongs to [constant during the lifetime
410 * of the structure] */
411 struct inode *i_vfs_inode;
412
413 /* Flags of inode [j_list_lock] */
414 unsigned int i_flags;
415};
416
f7f4bccb 417struct jbd2_revoke_table_s;
470decc6
DK
418
419/**
420 * struct handle_s - The handle_s type is the concrete type associated with
421 * handle_t.
422 * @h_transaction: Which compound transaction is this update a part of?
423 * @h_buffer_credits: Number of remaining buffers we are allowed to dirty.
424 * @h_ref: Reference count on this handle
425 * @h_err: Field for caller's use to track errors through large fs operations
426 * @h_sync: flag for sync-on-close
427 * @h_jdata: flag to force data journaling
428 * @h_aborted: flag indicating fatal error on handle
429 **/
430
431/* Docbook can't yet cope with the bit fields, but will leave the documentation
432 * in so it can be fixed later.
433 */
434
435struct handle_s
436{
437 /* Which compound transaction is this update a part of? */
438 transaction_t *h_transaction;
439
440 /* Number of remaining buffers we are allowed to dirty: */
441 int h_buffer_credits;
442
443 /* Reference count on this handle */
444 int h_ref;
445
446 /* Field for caller's use to track errors through large fs */
447 /* operations */
448 int h_err;
449
450 /* Flags [no locking] */
451 unsigned int h_sync: 1; /* sync-on-close */
452 unsigned int h_jdata: 1; /* force data journaling */
453 unsigned int h_aborted: 1; /* fatal error on handle */
7b751066
MC
454
455#ifdef CONFIG_DEBUG_LOCK_ALLOC
456 struct lockdep_map h_lockdep_map;
457#endif
470decc6
DK
458};
459
460
8e85fb3f
JL
461/*
462 * Some stats for checkpoint phase
463 */
464struct transaction_chp_stats_s {
465 unsigned long cs_chp_time;
466 unsigned long cs_forced_to_close;
467 unsigned long cs_written;
468 unsigned long cs_dropped;
469};
470
470decc6
DK
471/* The transaction_t type is the guts of the journaling mechanism. It
472 * tracks a compound transaction through its various states:
473 *
474 * RUNNING: accepting new updates
475 * LOCKED: Updates still running but we don't accept new ones
476 * RUNDOWN: Updates are tidying up but have finished requesting
477 * new buffers to modify (state not used for now)
478 * FLUSH: All updates complete, but we are still writing to disk
479 * COMMIT: All data on disk, writing commit record
480 * FINISHED: We still have to keep the transaction for checkpointing.
481 *
482 * The transaction keeps track of all of the buffers modified by a
483 * running transaction, and all of the buffers committed but not yet
484 * flushed to home for finished transactions.
485 */
486
487/*
488 * Lock ranking:
489 *
490 * j_list_lock
491 * ->jbd_lock_bh_journal_head() (This is "innermost")
492 *
493 * j_state_lock
494 * ->jbd_lock_bh_state()
495 *
496 * jbd_lock_bh_state()
497 * ->j_list_lock
498 *
499 * j_state_lock
500 * ->t_handle_lock
501 *
502 * j_state_lock
503 * ->j_list_lock (journal_unmap_buffer)
504 *
505 */
506
507struct transaction_s
508{
509 /* Pointer to the journal for this transaction. [no locking] */
510 journal_t *t_journal;
511
512 /* Sequence number for this transaction [no locking] */
513 tid_t t_tid;
514
515 /*
516 * Transaction's current state
f7f4bccb 517 * [no locking - only kjournald2 alters this]
f5a7a6b0
JK
518 * [j_list_lock] guards transition of a transaction into T_FINISHED
519 * state and subsequent call of __jbd2_journal_drop_transaction()
470decc6
DK
520 * FIXME: needs barriers
521 * KLUDGE: [use j_state_lock]
522 */
523 enum {
524 T_RUNNING,
525 T_LOCKED,
526 T_RUNDOWN,
527 T_FLUSH,
528 T_COMMIT,
529 T_FINISHED
530 } t_state;
531
532 /*
533 * Where in the log does this transaction's commit start? [no locking]
534 */
535 unsigned long t_log_start;
536
537 /* Number of buffers on the t_buffers list [j_list_lock] */
538 int t_nr_buffers;
539
540 /*
541 * Doubly-linked circular list of all buffers reserved but not yet
542 * modified by this transaction [j_list_lock]
543 */
544 struct journal_head *t_reserved_list;
545
470decc6
DK
546 /*
547 * Doubly-linked circular list of all metadata buffers owned by this
548 * transaction [j_list_lock]
549 */
550 struct journal_head *t_buffers;
551
470decc6
DK
552 /*
553 * Doubly-linked circular list of all forget buffers (superseded
554 * buffers which we can un-checkpoint once this transaction commits)
555 * [j_list_lock]
556 */
557 struct journal_head *t_forget;
558
559 /*
560 * Doubly-linked circular list of all buffers still to be flushed before
561 * this transaction can be checkpointed. [j_list_lock]
562 */
563 struct journal_head *t_checkpoint_list;
564
565 /*
566 * Doubly-linked circular list of all buffers submitted for IO while
567 * checkpointing. [j_list_lock]
568 */
569 struct journal_head *t_checkpoint_io_list;
570
571 /*
572 * Doubly-linked circular list of temporary buffers currently undergoing
573 * IO in the log [j_list_lock]
574 */
575 struct journal_head *t_iobuf_list;
576
577 /*
578 * Doubly-linked circular list of metadata buffers being shadowed by log
579 * IO. The IO buffers on the iobuf list and the shadow buffers on this
580 * list match each other one for one at all times. [j_list_lock]
581 */
582 struct journal_head *t_shadow_list;
583
584 /*
585 * Doubly-linked circular list of control buffers being written to the
586 * log. [j_list_lock]
587 */
588 struct journal_head *t_log_list;
589
c851ed54
JK
590 /*
591 * List of inodes whose data we've modified in data=ordered mode.
592 * [j_list_lock]
593 */
594 struct list_head t_inode_list;
595
470decc6
DK
596 /*
597 * Protects info related to handles
598 */
599 spinlock_t t_handle_lock;
600
8e85fb3f
JL
601 /*
602 * Longest time some handle had to wait for running transaction
603 */
604 unsigned long t_max_wait;
605
606 /*
607 * When transaction started
608 */
609 unsigned long t_start;
610
611 /*
612 * Checkpointing stats [j_checkpoint_sem]
613 */
614 struct transaction_chp_stats_s t_chp_stats;
615
470decc6
DK
616 /*
617 * Number of outstanding updates running on this transaction
618 * [t_handle_lock]
619 */
620 int t_updates;
621
622 /*
623 * Number of buffers reserved for use by all handles in this transaction
624 * handle but not yet modified. [t_handle_lock]
625 */
626 int t_outstanding_credits;
627
628 /*
629 * Forward and backward links for the circular list of all transactions
630 * awaiting checkpoint. [j_list_lock]
631 */
632 transaction_t *t_cpnext, *t_cpprev;
633
634 /*
635 * When will the transaction expire (become due for commit), in jiffies?
636 * [no locking]
637 */
638 unsigned long t_expires;
639
e07f7183
JB
640 /*
641 * When this transaction started, in nanoseconds [no locking]
642 */
643 ktime_t t_start_time;
644
470decc6
DK
645 /*
646 * How many handles used this transaction? [t_handle_lock]
647 */
648 int t_handle_count;
649
3e624fc7
TT
650 /*
651 * For use by the filesystem to store fs-specific data
652 * structures associated with the transaction
653 */
654 struct list_head t_private_list;
470decc6
DK
655};
656
8e85fb3f
JL
657struct transaction_run_stats_s {
658 unsigned long rs_wait;
659 unsigned long rs_running;
660 unsigned long rs_locked;
661 unsigned long rs_flushing;
662 unsigned long rs_logging;
663
664 unsigned long rs_handle_count;
665 unsigned long rs_blocks;
666 unsigned long rs_blocks_logged;
667};
668
669struct transaction_stats_s {
670 int ts_type;
671 unsigned long ts_tid;
672 union {
673 struct transaction_run_stats_s run;
674 struct transaction_chp_stats_s chp;
675 } u;
676};
677
678#define JBD2_STATS_RUN 1
679#define JBD2_STATS_CHECKPOINT 2
680
681static inline unsigned long
682jbd2_time_diff(unsigned long start, unsigned long end)
683{
684 if (end >= start)
685 return end - start;
686
687 return end + (MAX_JIFFY_OFFSET - start);
688}
689
470decc6
DK
690/**
691 * struct journal_s - The journal_s type is the concrete type associated with
692 * journal_t.
693 * @j_flags: General journaling state flags
694 * @j_errno: Is there an outstanding uncleared error on the journal (from a
695 * prior abort)?
696 * @j_sb_buffer: First part of superblock buffer
697 * @j_superblock: Second part of superblock buffer
698 * @j_format_version: Version of the superblock format
699 * @j_state_lock: Protect the various scalars in the journal
700 * @j_barrier_count: Number of processes waiting to create a barrier lock
701 * @j_barrier: The barrier lock itself
702 * @j_running_transaction: The current running transaction..
703 * @j_committing_transaction: the transaction we are pushing to disk
704 * @j_checkpoint_transactions: a linked circular list of all transactions
705 * waiting for checkpointing
706 * @j_wait_transaction_locked: Wait queue for waiting for a locked transaction
707 * to start committing, or for a barrier lock to be released
708 * @j_wait_logspace: Wait queue for waiting for checkpointing to complete
709 * @j_wait_done_commit: Wait queue for waiting for commit to complete
710 * @j_wait_checkpoint: Wait queue to trigger checkpointing
711 * @j_wait_commit: Wait queue to trigger commit
712 * @j_wait_updates: Wait queue to wait for updates to complete
713 * @j_checkpoint_mutex: Mutex for locking against concurrent checkpoints
714 * @j_head: Journal head - identifies the first unused block in the journal
715 * @j_tail: Journal tail - identifies the oldest still-used block in the
716 * journal.
717 * @j_free: Journal free - how many free blocks are there in the journal?
718 * @j_first: The block number of the first usable block
719 * @j_last: The block number one beyond the last usable block
720 * @j_dev: Device where we store the journal
721 * @j_blocksize: blocksize for the location where we store the journal.
722 * @j_blk_offset: starting block offset for into the device where we store the
723 * journal
724 * @j_fs_dev: Device which holds the client fs. For internal journal this will
725 * be equal to j_dev
726 * @j_maxlen: Total maximum capacity of the journal region on disk.
727 * @j_list_lock: Protects the buffer lists and internal buffer state.
728 * @j_inode: Optional inode where we store the journal. If present, all journal
729 * block numbers are mapped into this inode via bmap().
730 * @j_tail_sequence: Sequence number of the oldest transaction in the log
731 * @j_transaction_sequence: Sequence number of the next transaction to grant
732 * @j_commit_sequence: Sequence number of the most recently committed
733 * transaction
734 * @j_commit_request: Sequence number of the most recent transaction wanting
735 * commit
736 * @j_uuid: Uuid of client object.
737 * @j_task: Pointer to the current commit thread for this journal
738 * @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a
739 * single compound commit transaction
740 * @j_commit_interval: What is the maximum transaction lifetime before we begin
741 * a commit?
742 * @j_commit_timer: The timer used to wakeup the commit thread
743 * @j_revoke_lock: Protect the revoke table
744 * @j_revoke: The revoke table - maintains the list of revoked blocks in the
745 * current transaction.
746 * @j_revoke_table: alternate revoke tables for j_revoke
f7f4bccb 747 * @j_wbuf: array of buffer_heads for jbd2_journal_commit_transaction
470decc6
DK
748 * @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the
749 * number that will fit in j_blocksize
750 * @j_last_sync_writer: most recent pid which did a synchronous write
8e85fb3f
JL
751 * @j_history: Buffer storing the transactions statistics history
752 * @j_history_max: Maximum number of transactions in the statistics history
753 * @j_history_cur: Current number of transactions in the statistics history
754 * @j_history_lock: Protect the transactions statistics history
755 * @j_proc_entry: procfs entry for the jbd statistics directory
756 * @j_stats: Overall statistics
470decc6
DK
757 * @j_private: An opaque pointer to fs-private information.
758 */
759
760struct journal_s
761{
762 /* General journaling state flags [j_state_lock] */
763 unsigned long j_flags;
764
765 /*
766 * Is there an outstanding uncleared error on the journal (from a prior
767 * abort)? [j_state_lock]
768 */
769 int j_errno;
770
771 /* The superblock buffer */
772 struct buffer_head *j_sb_buffer;
773 journal_superblock_t *j_superblock;
774
775 /* Version of the superblock format */
776 int j_format_version;
777
778 /*
779 * Protect the various scalars in the journal
780 */
781 spinlock_t j_state_lock;
782
783 /*
784 * Number of processes waiting to create a barrier lock [j_state_lock]
785 */
786 int j_barrier_count;
787
788 /* The barrier lock itself */
789 struct mutex j_barrier;
790
791 /*
792 * Transactions: The current running transaction...
793 * [j_state_lock] [caller holding open handle]
794 */
795 transaction_t *j_running_transaction;
796
797 /*
798 * the transaction we are pushing to disk
799 * [j_state_lock] [caller holding open handle]
800 */
801 transaction_t *j_committing_transaction;
802
803 /*
804 * ... and a linked circular list of all transactions waiting for
805 * checkpointing. [j_list_lock]
806 */
807 transaction_t *j_checkpoint_transactions;
808
809 /*
810 * Wait queue for waiting for a locked transaction to start committing,
811 * or for a barrier lock to be released
812 */
813 wait_queue_head_t j_wait_transaction_locked;
814
815 /* Wait queue for waiting for checkpointing to complete */
816 wait_queue_head_t j_wait_logspace;
817
818 /* Wait queue for waiting for commit to complete */
819 wait_queue_head_t j_wait_done_commit;
820
821 /* Wait queue to trigger checkpointing */
822 wait_queue_head_t j_wait_checkpoint;
823
824 /* Wait queue to trigger commit */
825 wait_queue_head_t j_wait_commit;
826
827 /* Wait queue to wait for updates to complete */
828 wait_queue_head_t j_wait_updates;
829
830 /* Semaphore for locking against concurrent checkpoints */
831 struct mutex j_checkpoint_mutex;
832
833 /*
834 * Journal head: identifies the first unused block in the journal.
835 * [j_state_lock]
836 */
837 unsigned long j_head;
838
839 /*
840 * Journal tail: identifies the oldest still-used block in the journal.
841 * [j_state_lock]
842 */
843 unsigned long j_tail;
844
845 /*
846 * Journal free: how many free blocks are there in the journal?
847 * [j_state_lock]
848 */
849 unsigned long j_free;
850
851 /*
852 * Journal start and end: the block numbers of the first usable block
853 * and one beyond the last usable block in the journal. [j_state_lock]
854 */
855 unsigned long j_first;
856 unsigned long j_last;
857
858 /*
859 * Device, blocksize and starting block offset for the location where we
860 * store the journal.
861 */
862 struct block_device *j_dev;
863 int j_blocksize;
05496769
TT
864 unsigned long long j_blk_offset;
865 char j_devname[BDEVNAME_SIZE+24];
470decc6
DK
866
867 /*
868 * Device which holds the client fs. For internal journal this will be
869 * equal to j_dev.
870 */
871 struct block_device *j_fs_dev;
872
873 /* Total maximum capacity of the journal region on disk. */
874 unsigned int j_maxlen;
875
876 /*
877 * Protects the buffer lists and internal buffer state.
878 */
879 spinlock_t j_list_lock;
880
881 /* Optional inode where we store the journal. If present, all */
882 /* journal block numbers are mapped into this inode via */
883 /* bmap(). */
884 struct inode *j_inode;
885
886 /*
887 * Sequence number of the oldest transaction in the log [j_state_lock]
888 */
889 tid_t j_tail_sequence;
890
891 /*
892 * Sequence number of the next transaction to grant [j_state_lock]
893 */
894 tid_t j_transaction_sequence;
895
896 /*
897 * Sequence number of the most recently committed transaction
898 * [j_state_lock].
899 */
900 tid_t j_commit_sequence;
901
902 /*
903 * Sequence number of the most recent transaction wanting commit
904 * [j_state_lock]
905 */
906 tid_t j_commit_request;
907
908 /*
909 * Journal uuid: identifies the object (filesystem, LVM volume etc)
910 * backed by this journal. This will eventually be replaced by an array
911 * of uuids, allowing us to index multiple devices within a single
912 * journal and to perform atomic updates across them.
913 */
914 __u8 j_uuid[16];
915
916 /* Pointer to the current commit thread for this journal */
917 struct task_struct *j_task;
918
919 /*
920 * Maximum number of metadata buffers to allow in a single compound
921 * commit transaction
922 */
923 int j_max_transaction_buffers;
924
925 /*
926 * What is the maximum transaction lifetime before we begin a commit?
927 */
928 unsigned long j_commit_interval;
929
930 /* The timer used to wakeup the commit thread: */
931 struct timer_list j_commit_timer;
932
933 /*
934 * The revoke table: maintains the list of revoked blocks in the
935 * current transaction. [j_revoke_lock]
936 */
937 spinlock_t j_revoke_lock;
f7f4bccb
MC
938 struct jbd2_revoke_table_s *j_revoke;
939 struct jbd2_revoke_table_s *j_revoke_table[2];
470decc6
DK
940
941 /*
f7f4bccb 942 * array of bhs for jbd2_journal_commit_transaction
470decc6
DK
943 */
944 struct buffer_head **j_wbuf;
945 int j_wbufsize;
946
e07f7183
JB
947 /*
948 * this is the pid of hte last person to run a synchronous operation
949 * through the journal
950 */
470decc6
DK
951 pid_t j_last_sync_writer;
952
e07f7183
JB
953 /*
954 * the average amount of time in nanoseconds it takes to commit a
955 * transaction to disk. [j_state_lock]
956 */
957 u64 j_average_commit_time;
958
3e624fc7
TT
959 /* This function is called when a transaction is closed */
960 void (*j_commit_callback)(journal_t *,
961 transaction_t *);
962
470decc6 963 /*
8e85fb3f
JL
964 * Journal statistics
965 */
966 struct transaction_stats_s *j_history;
967 int j_history_max;
968 int j_history_cur;
969 /*
970 * Protect the transactions statistics history
971 */
972 spinlock_t j_history_lock;
973 struct proc_dir_entry *j_proc_entry;
974 struct transaction_stats_s j_stats;
975
624080ed
TT
976 /* Failed journal commit ID */
977 unsigned int j_failed_commit;
978
8e85fb3f 979 /*
470decc6
DK
980 * An opaque pointer to fs-private information. ext3 puts its
981 * superblock pointer here
982 */
983 void *j_private;
984};
985
986/*
987 * Journal flag definitions
988 */
f7f4bccb
MC
989#define JBD2_UNMOUNT 0x001 /* Journal thread is being destroyed */
990#define JBD2_ABORT 0x002 /* Journaling has been aborted for errors. */
991#define JBD2_ACK_ERR 0x004 /* The errno in the sb has been acked */
992#define JBD2_FLUSHED 0x008 /* The journal superblock has been flushed */
993#define JBD2_LOADED 0x010 /* The journal superblock has been loaded */
994#define JBD2_BARRIER 0x020 /* Use IDE barriers */
5bf5683a
HK
995#define JBD2_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file
996 * data write error in ordered
997 * mode */
470decc6
DK
998
999/*
1000 * Function declarations for the journaling transaction and buffer
1001 * management
1002 */
1003
1004/* Filing buffers */
f7f4bccb
MC
1005extern void jbd2_journal_unfile_buffer(journal_t *, struct journal_head *);
1006extern void __jbd2_journal_unfile_buffer(struct journal_head *);
1007extern void __jbd2_journal_refile_buffer(struct journal_head *);
1008extern void jbd2_journal_refile_buffer(journal_t *, struct journal_head *);
1009extern void __jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int);
470decc6 1010extern void __journal_free_buffer(struct journal_head *bh);
f7f4bccb 1011extern void jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int);
470decc6
DK
1012extern void __journal_clean_data_list(transaction_t *transaction);
1013
1014/* Log buffer allocation */
f7f4bccb 1015extern struct journal_head * jbd2_journal_get_descriptor_buffer(journal_t *);
18eba7aa 1016int jbd2_journal_next_log_block(journal_t *, unsigned long long *);
470decc6
DK
1017
1018/* Commit management */
f7f4bccb 1019extern void jbd2_journal_commit_transaction(journal_t *);
470decc6
DK
1020
1021/* Checkpoint list management */
f7f4bccb
MC
1022int __jbd2_journal_clean_checkpoint_list(journal_t *journal);
1023int __jbd2_journal_remove_checkpoint(struct journal_head *);
1024void __jbd2_journal_insert_checkpoint(struct journal_head *, transaction_t *);
470decc6
DK
1025
1026/* Buffer IO */
1027extern int
f7f4bccb 1028jbd2_journal_write_metadata_buffer(transaction_t *transaction,
470decc6
DK
1029 struct journal_head *jh_in,
1030 struct journal_head **jh_out,
18eba7aa 1031 unsigned long long blocknr);
470decc6
DK
1032
1033/* Transaction locking */
1034extern void __wait_on_journal (journal_t *);
1035
1036/*
1037 * Journal locking.
1038 *
1039 * We need to lock the journal during transaction state changes so that nobody
1040 * ever tries to take a handle on the running transaction while we are in the
1041 * middle of moving it to the commit phase. j_state_lock does this.
1042 *
1043 * Note that the locking is completely interrupt unsafe. We never touch
1044 * journal structures from interrupts.
1045 */
1046
1047static inline handle_t *journal_current_handle(void)
1048{
1049 return current->journal_info;
1050}
1051
1052/* The journaling code user interface:
1053 *
1054 * Create and destroy handles
1055 * Register buffer modifications against the current transaction.
1056 */
1057
f7f4bccb
MC
1058extern handle_t *jbd2_journal_start(journal_t *, int nblocks);
1059extern int jbd2_journal_restart (handle_t *, int nblocks);
1060extern int jbd2_journal_extend (handle_t *, int nblocks);
1061extern int jbd2_journal_get_write_access(handle_t *, struct buffer_head *);
1062extern int jbd2_journal_get_create_access (handle_t *, struct buffer_head *);
1063extern int jbd2_journal_get_undo_access(handle_t *, struct buffer_head *);
f7f4bccb
MC
1064extern int jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *);
1065extern void jbd2_journal_release_buffer (handle_t *, struct buffer_head *);
1066extern int jbd2_journal_forget (handle_t *, struct buffer_head *);
470decc6 1067extern void journal_sync_buffer (struct buffer_head *);
f7f4bccb 1068extern void jbd2_journal_invalidatepage(journal_t *,
470decc6 1069 struct page *, unsigned long);
f7f4bccb
MC
1070extern int jbd2_journal_try_to_free_buffers(journal_t *, struct page *, gfp_t);
1071extern int jbd2_journal_stop(handle_t *);
1072extern int jbd2_journal_flush (journal_t *);
1073extern void jbd2_journal_lock_updates (journal_t *);
1074extern void jbd2_journal_unlock_updates (journal_t *);
470decc6 1075
f7f4bccb 1076extern journal_t * jbd2_journal_init_dev(struct block_device *bdev,
470decc6 1077 struct block_device *fs_dev,
18eba7aa 1078 unsigned long long start, int len, int bsize);
f7f4bccb
MC
1079extern journal_t * jbd2_journal_init_inode (struct inode *);
1080extern int jbd2_journal_update_format (journal_t *);
1081extern int jbd2_journal_check_used_features
470decc6 1082 (journal_t *, unsigned long, unsigned long, unsigned long);
f7f4bccb 1083extern int jbd2_journal_check_available_features
470decc6 1084 (journal_t *, unsigned long, unsigned long, unsigned long);
f7f4bccb 1085extern int jbd2_journal_set_features
470decc6 1086 (journal_t *, unsigned long, unsigned long, unsigned long);
818d276c
GS
1087extern void jbd2_journal_clear_features
1088 (journal_t *, unsigned long, unsigned long, unsigned long);
f7f4bccb
MC
1089extern int jbd2_journal_create (journal_t *);
1090extern int jbd2_journal_load (journal_t *journal);
44519faf 1091extern int jbd2_journal_destroy (journal_t *);
f7f4bccb
MC
1092extern int jbd2_journal_recover (journal_t *journal);
1093extern int jbd2_journal_wipe (journal_t *, int);
1094extern int jbd2_journal_skip_recovery (journal_t *);
1095extern void jbd2_journal_update_superblock (journal_t *, int);
1096extern void __jbd2_journal_abort_hard (journal_t *);
1097extern void jbd2_journal_abort (journal_t *, int);
1098extern int jbd2_journal_errno (journal_t *);
1099extern void jbd2_journal_ack_err (journal_t *);
1100extern int jbd2_journal_clear_err (journal_t *);
18eba7aa 1101extern int jbd2_journal_bmap(journal_t *, unsigned long, unsigned long long *);
f7f4bccb 1102extern int jbd2_journal_force_commit(journal_t *);
c851ed54
JK
1103extern int jbd2_journal_file_inode(handle_t *handle, struct jbd2_inode *inode);
1104extern int jbd2_journal_begin_ordered_truncate(struct jbd2_inode *inode, loff_t new_size);
1105extern void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode);
1106extern void jbd2_journal_release_jbd_inode(journal_t *journal, struct jbd2_inode *jinode);
470decc6
DK
1107
1108/*
1109 * journal_head management
1110 */
f7f4bccb
MC
1111struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh);
1112struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh);
1113void jbd2_journal_remove_journal_head(struct buffer_head *bh);
1114void jbd2_journal_put_journal_head(struct journal_head *jh);
470decc6
DK
1115
1116/*
1117 * handle management
1118 */
e18b890b 1119extern struct kmem_cache *jbd2_handle_cache;
470decc6 1120
af1e76d6 1121static inline handle_t *jbd2_alloc_handle(gfp_t gfp_flags)
470decc6 1122{
f7f4bccb 1123 return kmem_cache_alloc(jbd2_handle_cache, gfp_flags);
470decc6
DK
1124}
1125
af1e76d6 1126static inline void jbd2_free_handle(handle_t *handle)
470decc6 1127{
f7f4bccb 1128 kmem_cache_free(jbd2_handle_cache, handle);
470decc6
DK
1129}
1130
1131/* Primary revoke support */
1132#define JOURNAL_REVOKE_DEFAULT_HASH 256
f7f4bccb
MC
1133extern int jbd2_journal_init_revoke(journal_t *, int);
1134extern void jbd2_journal_destroy_revoke_caches(void);
1135extern int jbd2_journal_init_revoke_caches(void);
470decc6 1136
f7f4bccb 1137extern void jbd2_journal_destroy_revoke(journal_t *);
18eba7aa 1138extern int jbd2_journal_revoke (handle_t *, unsigned long long, struct buffer_head *);
f7f4bccb
MC
1139extern int jbd2_journal_cancel_revoke(handle_t *, struct journal_head *);
1140extern void jbd2_journal_write_revoke_records(journal_t *, transaction_t *);
470decc6
DK
1141
1142/* Recovery revoke support */
18eba7aa
MC
1143extern int jbd2_journal_set_revoke(journal_t *, unsigned long long, tid_t);
1144extern int jbd2_journal_test_revoke(journal_t *, unsigned long long, tid_t);
f7f4bccb
MC
1145extern void jbd2_journal_clear_revoke(journal_t *);
1146extern void jbd2_journal_switch_revoke_table(journal_t *journal);
470decc6
DK
1147
1148/*
1149 * The log thread user interface:
1150 *
1151 * Request space in the current transaction, and force transaction commit
1152 * transitions on demand.
1153 */
1154
f7f4bccb
MC
1155int __jbd2_log_space_left(journal_t *); /* Called with journal locked */
1156int jbd2_log_start_commit(journal_t *journal, tid_t tid);
1157int __jbd2_log_start_commit(journal_t *journal, tid_t tid);
1158int jbd2_journal_start_commit(journal_t *journal, tid_t *tid);
1159int jbd2_journal_force_commit_nested(journal_t *journal);
1160int jbd2_log_wait_commit(journal_t *journal, tid_t tid);
1161int jbd2_log_do_checkpoint(journal_t *journal);
470decc6 1162
f7f4bccb
MC
1163void __jbd2_log_wait_for_space(journal_t *journal);
1164extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *);
1165extern int jbd2_cleanup_journal_tail(journal_t *);
470decc6
DK
1166
1167/* Debugging code only: */
1168
1169#define jbd_ENOSYS() \
1170do { \
d5c003b4 1171 printk (KERN_ERR "JBD unimplemented function %s\n", __func__); \
470decc6
DK
1172 current->state = TASK_UNINTERRUPTIBLE; \
1173 schedule(); \
1174} while (1)
1175
1176/*
1177 * is_journal_abort
1178 *
f7f4bccb 1179 * Simple test wrapper function to test the JBD2_ABORT state flag. This
470decc6
DK
1180 * bit, when set, indicates that we have had a fatal error somewhere,
1181 * either inside the journaling layer or indicated to us by the client
1182 * (eg. ext3), and that we and should not commit any further
1183 * transactions.
1184 */
1185
1186static inline int is_journal_aborted(journal_t *journal)
1187{
f7f4bccb 1188 return journal->j_flags & JBD2_ABORT;
470decc6
DK
1189}
1190
1191static inline int is_handle_aborted(handle_t *handle)
1192{
1193 if (handle->h_aborted)
1194 return 1;
1195 return is_journal_aborted(handle->h_transaction->t_journal);
1196}
1197
f7f4bccb 1198static inline void jbd2_journal_abort_handle(handle_t *handle)
470decc6
DK
1199{
1200 handle->h_aborted = 1;
1201}
1202
1203#endif /* __KERNEL__ */
1204
1205/* Comparison functions for transaction IDs: perform comparisons using
1206 * modulo arithmetic so that they work over sequence number wraps. */
1207
1208static inline int tid_gt(tid_t x, tid_t y)
1209{
1210 int difference = (x - y);
1211 return (difference > 0);
1212}
1213
1214static inline int tid_geq(tid_t x, tid_t y)
1215{
1216 int difference = (x - y);
1217 return (difference >= 0);
1218}
1219
f7f4bccb 1220extern int jbd2_journal_blocks_per_page(struct inode *inode);
b517bea1 1221extern size_t journal_tag_bytes(journal_t *journal);
470decc6
DK
1222
1223/*
1224 * Return the minimum number of blocks which must be free in the journal
1225 * before a new transaction may be started. Must be called under j_state_lock.
1226 */
1227static inline int jbd_space_needed(journal_t *journal)
1228{
1229 int nblocks = journal->j_max_transaction_buffers;
1230 if (journal->j_committing_transaction)
1231 nblocks += journal->j_committing_transaction->
1232 t_outstanding_credits;
1233 return nblocks;
1234}
1235
1236/*
1237 * Definitions which augment the buffer_head layer
1238 */
1239
1240/* journaling buffer types */
1241#define BJ_None 0 /* Not journaled */
87c89c23
JK
1242#define BJ_Metadata 1 /* Normal journaled metadata */
1243#define BJ_Forget 2 /* Buffer superseded by this transaction */
1244#define BJ_IO 3 /* Buffer is for temporary IO use */
1245#define BJ_Shadow 4 /* Buffer contents being shadowed to the log */
1246#define BJ_LogCtl 5 /* Buffer contains log descriptors */
1247#define BJ_Reserved 6 /* Buffer is reserved for access by journal */
1248#define BJ_Types 7
470decc6
DK
1249
1250extern int jbd_blocks_per_page(struct inode *inode);
1251
1252#ifdef __KERNEL__
1253
1254#define buffer_trace_init(bh) do {} while (0)
1255#define print_buffer_fields(bh) do {} while (0)
1256#define print_buffer_trace(bh) do {} while (0)
1257#define BUFFER_TRACE(bh, info) do {} while (0)
1258#define BUFFER_TRACE2(bh, bh2, info) do {} while (0)
1259#define JBUFFER_TRACE(jh, info) do {} while (0)
1260
1261#endif /* __KERNEL__ */
1262
cd02ff0b 1263#endif /* _LINUX_JBD2_H */