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Dave Kleikamp470decc2006-10-11 01:20:57 -07001/*
Mingming Caof7f4bcc2006-10-11 01:20:59 -07002 * linux/include/linux/jbd2.h
Dave Kleikamp470decc2006-10-11 01:20:57 -07003 *
4 * Written by Stephen C. Tweedie <sct@redhat.com>
5 *
6 * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved
7 *
8 * This file is part of the Linux kernel and is made available under
9 * the terms of the GNU General Public License, version 2, or at your
10 * option, any later version, incorporated herein by reference.
11 *
12 * Definitions for transaction data structures for the buffer cache
13 * filesystem journaling support.
14 */
15
Mingming Caocd02ff02007-10-16 18:38:25 -040016#ifndef _LINUX_JBD2_H
17#define _LINUX_JBD2_H
Dave Kleikamp470decc2006-10-11 01:20:57 -070018
19/* Allow this file to be included directly into e2fsprogs */
20#ifndef __KERNEL__
21#include "jfs_compat.h"
Mingming Caof7f4bcc2006-10-11 01:20:59 -070022#define JBD2_DEBUG
Dave Kleikamp470decc2006-10-11 01:20:57 -070023#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>
Dave Kleikamp470decc2006-10-11 01:20:57 -070033#endif
34
35#define journal_oom_retry 1
36
37/*
Mingming Caocd02ff02007-10-16 18:38:25 -040038 * Define JBD2_PARANIOD_IOFAIL to cause a kernel BUG() if ext4 finds
Dave Kleikamp470decc2006-10-11 01:20:57 -070039 * certain classes of error which can occur due to failed IOs. Under
Mingming Caocd02ff02007-10-16 18:38:25 -040040 * normal use we want ext4 to continue after such errors, because
Dave Kleikamp470decc2006-10-11 01:20:57 -070041 * hardware _can_ fail, but for debugging purposes when running tests on
42 * known-good hardware we may want to trap these errors.
43 */
Mingming Caocd02ff02007-10-16 18:38:25 -040044#undef JBD2_PARANOID_IOFAIL
Dave Kleikamp470decc2006-10-11 01:20:57 -070045
46/*
47 * The default maximum commit age, in seconds.
48 */
Mingming Caocd02ff02007-10-16 18:38:25 -040049#define JBD2_DEFAULT_MAX_COMMIT_AGE 5
Dave Kleikamp470decc2006-10-11 01:20:57 -070050
Jose R. Santose23291b2007-07-18 08:57:06 -040051#ifdef CONFIG_JBD2_DEBUG
Dave Kleikamp470decc2006-10-11 01:20:57 -070052/*
Mingming Caocd02ff02007-10-16 18:38:25 -040053 * Define JBD2_EXPENSIVE_CHECKING to enable more expensive internal
Dave Kleikamp470decc2006-10-11 01:20:57 -070054 * consistency checks. By default we don't do this unless
Jose R. Santose23291b2007-07-18 08:57:06 -040055 * CONFIG_JBD2_DEBUG is on.
Dave Kleikamp470decc2006-10-11 01:20:57 -070056 */
Mingming Caocd02ff02007-10-16 18:38:25 -040057#define JBD2_EXPENSIVE_CHECKING
Jose R. Santos0f49d5d2007-07-18 08:50:18 -040058extern u8 jbd2_journal_enable_debug;
Dave Kleikamp470decc2006-10-11 01:20:57 -070059
60#define jbd_debug(n, f, a...) \
61 do { \
Mingming Caof7f4bcc2006-10-11 01:20:59 -070062 if ((n) <= jbd2_journal_enable_debug) { \
Dave Kleikamp470decc2006-10-11 01:20:57 -070063 printk (KERN_DEBUG "(%s, %d): %s: ", \
Harvey Harrisond5c003b2008-10-15 22:01:24 -070064 __FILE__, __LINE__, __func__); \
Dave Kleikamp470decc2006-10-11 01:20:57 -070065 printk (f, ## a); \
66 } \
67 } while (0)
68#else
69#define jbd_debug(f, a...) /**/
70#endif
71
Mingming Caoaf1e76d2007-10-16 18:38:25 -040072static 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
Mingming Caof7f4bcc2006-10-11 01:20:59 -070082#define JBD2_MIN_JOURNAL_BLOCKS 1024
Dave Kleikamp470decc2006-10-11 01:20:57 -070083
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
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700124#define JBD2_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700125
126/*
127 * On-disk structures
128 */
129
130/*
131 * Descriptor block types:
132 */
133
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700134#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
Dave Kleikamp470decc2006-10-11 01:20:57 -0700139
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
Girish Shilamkar818d2762008-01-28 23:58:27 -0500150/*
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];
Theodore Ts'o736603a2008-07-11 19:27:31 -0400171 __be64 h_commit_sec;
172 __be32 h_commit_nsec;
Girish Shilamkar818d2762008-01-28 23:58:27 -0500173};
Dave Kleikamp470decc2006-10-11 01:20:57 -0700174
175/*
Zach Brownb517bea2006-10-11 01:21:08 -0700176 * 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.
Dave Kleikamp470decc2006-10-11 01:20:57 -0700180 */
181typedef struct journal_block_tag_s
182{
183 __be32 t_blocknr; /* The on-disk block number */
184 __be32 t_flags; /* See below */
Zach Brownb517bea2006-10-11 01:21:08 -0700185 __be32 t_blocknr_high; /* most-significant high 32bits. */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700186} journal_block_tag_t;
187
Mingming Caocd02ff02007-10-16 18:38:25 -0400188#define JBD2_TAG_SIZE32 (offsetof(journal_block_tag_t, t_blocknr_high))
189#define JBD2_TAG_SIZE64 (sizeof(journal_block_tag_t))
Zach Brownb517bea2006-10-11 01:21:08 -0700190
Dave Kleikamp470decc2006-10-11 01:20:57 -0700191/*
192 * The revoke descriptor: used on disk to describe a series of blocks to
193 * be revoked from the log
194 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700195typedef struct jbd2_journal_revoke_header_s
Dave Kleikamp470decc2006-10-11 01:20:57 -0700196{
197 journal_header_t r_header;
198 __be32 r_count; /* Count of bytes used in the block */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700199} jbd2_journal_revoke_header_t;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700200
201
202/* Definitions for the journal tag flags word: */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700203#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 */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700207
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 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700229 /* Error value, as set by jbd2_journal_abort(). */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700230 __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
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700257#define JBD2_HAS_COMPAT_FEATURE(j,mask) \
Dave Kleikamp470decc2006-10-11 01:20:57 -0700258 ((j)->j_format_version >= 2 && \
259 ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask))))
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700260#define JBD2_HAS_RO_COMPAT_FEATURE(j,mask) \
Dave Kleikamp470decc2006-10-11 01:20:57 -0700261 ((j)->j_format_version >= 2 && \
262 ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask))))
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700263#define JBD2_HAS_INCOMPAT_FEATURE(j,mask) \
Dave Kleikamp470decc2006-10-11 01:20:57 -0700264 ((j)->j_format_version >= 2 && \
265 ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask))))
266
Girish Shilamkar818d2762008-01-28 23:58:27 -0500267#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
Dave Kleikamp470decc2006-10-11 01:20:57 -0700272
273/* Features known to this kernel version: */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500274#define JBD2_KNOWN_COMPAT_FEATURES JBD2_FEATURE_COMPAT_CHECKSUM
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700275#define JBD2_KNOWN_ROCOMPAT_FEATURES 0
Zach Brownb517bea2006-10-11 01:21:08 -0700276#define JBD2_KNOWN_INCOMPAT_FEATURES (JBD2_FEATURE_INCOMPAT_REVOKE | \
Girish Shilamkar818d2762008-01-28 23:58:27 -0500277 JBD2_FEATURE_INCOMPAT_64BIT | \
278 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700279
280#ifdef __KERNEL__
281
282#include <linux/fs.h>
283#include <linux/sched.h>
284
Chris Snook36df53f2008-01-28 23:58:27 -0500285#define J_ASSERT(assert) BUG_ON(!(assert))
Dave Kleikamp470decc2006-10-11 01:20:57 -0700286
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
Mingming Caocd02ff02007-10-16 18:38:25 -0400301#if defined(JBD2_PARANOID_IOFAIL)
Dave Kleikamp470decc2006-10-11 01:20:57 -0700302#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 \
Theodore Ts'o08ec8c32009-01-16 11:57:00 -0500311 "JBD2 unexpected failure: %s: %s;\n", \
312 __func__, #expr); \
Dave Kleikamp470decc2006-10-11 01:20:57 -0700313 printk(KERN_ERR why "\n"); \
314 } \
315 val; \
316 })
317#define J_EXPECT(expr, why...) __journal_expect(expr, ## why)
318#define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why)
319#define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why)
320#endif
321
322enum jbd_state_bits {
323 BH_JBD /* Has an attached ext3 journal_head */
324 = BH_PrivateStart,
325 BH_JWrite, /* Being written to log (@@@ DEBUGGING) */
326 BH_Freed, /* Has been freed (truncated) */
327 BH_Revoked, /* Has been revoked from the log */
328 BH_RevokeValid, /* Revoked flag is valid */
329 BH_JBDDirty, /* Is dirty but journaled */
330 BH_State, /* Pins most journal_head state */
331 BH_JournalHead, /* Pins bh->b_private and jh->b_bh */
332 BH_Unshadow, /* Dummy bit, for BJ_Shadow wakeup filtering */
Mark Fashehe97fcd92008-11-18 17:15:24 -0800333 BH_JBDPrivateStart, /* First bit available for private use by FS */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700334};
335
336BUFFER_FNS(JBD, jbd)
337BUFFER_FNS(JWrite, jwrite)
338BUFFER_FNS(JBDDirty, jbddirty)
339TAS_BUFFER_FNS(JBDDirty, jbddirty)
340BUFFER_FNS(Revoked, revoked)
341TAS_BUFFER_FNS(Revoked, revoked)
342BUFFER_FNS(RevokeValid, revokevalid)
343TAS_BUFFER_FNS(RevokeValid, revokevalid)
344BUFFER_FNS(Freed, freed)
345
346static inline struct buffer_head *jh2bh(struct journal_head *jh)
347{
348 return jh->b_bh;
349}
350
351static inline struct journal_head *bh2jh(struct buffer_head *bh)
352{
353 return bh->b_private;
354}
355
356static inline void jbd_lock_bh_state(struct buffer_head *bh)
357{
358 bit_spin_lock(BH_State, &bh->b_state);
359}
360
361static inline int jbd_trylock_bh_state(struct buffer_head *bh)
362{
363 return bit_spin_trylock(BH_State, &bh->b_state);
364}
365
366static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
367{
368 return bit_spin_is_locked(BH_State, &bh->b_state);
369}
370
371static inline void jbd_unlock_bh_state(struct buffer_head *bh)
372{
373 bit_spin_unlock(BH_State, &bh->b_state);
374}
375
376static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
377{
378 bit_spin_lock(BH_JournalHead, &bh->b_state);
379}
380
381static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
382{
383 bit_spin_unlock(BH_JournalHead, &bh->b_state);
384}
385
Jan Karac851ed52008-07-11 19:27:31 -0400386/* Flags in jbd_inode->i_flags */
387#define __JI_COMMIT_RUNNING 0
388/* Commit of the inode data in progress. We use this flag to protect us from
389 * concurrent deletion of inode. We cannot use reference to inode for this
390 * since we cannot afford doing last iput() on behalf of kjournald
391 */
392#define JI_COMMIT_RUNNING (1 << __JI_COMMIT_RUNNING)
393
394/**
395 * struct jbd_inode is the structure linking inodes in ordered mode
396 * present in a transaction so that we can sync them during commit.
397 */
398struct jbd2_inode {
399 /* Which transaction does this inode belong to? Either the running
400 * transaction or the committing one. [j_list_lock] */
401 transaction_t *i_transaction;
402
403 /* Pointer to the running transaction modifying inode's data in case
404 * there is already a committing transaction touching it. [j_list_lock] */
405 transaction_t *i_next_transaction;
406
407 /* List of inodes in the i_transaction [j_list_lock] */
408 struct list_head i_list;
409
410 /* VFS inode this inode belongs to [constant during the lifetime
411 * of the structure] */
412 struct inode *i_vfs_inode;
413
414 /* Flags of inode [j_list_lock] */
415 unsigned int i_flags;
416};
417
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700418struct jbd2_revoke_table_s;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700419
420/**
421 * struct handle_s - The handle_s type is the concrete type associated with
422 * handle_t.
423 * @h_transaction: Which compound transaction is this update a part of?
424 * @h_buffer_credits: Number of remaining buffers we are allowed to dirty.
425 * @h_ref: Reference count on this handle
426 * @h_err: Field for caller's use to track errors through large fs operations
427 * @h_sync: flag for sync-on-close
428 * @h_jdata: flag to force data journaling
429 * @h_aborted: flag indicating fatal error on handle
430 **/
431
432/* Docbook can't yet cope with the bit fields, but will leave the documentation
433 * in so it can be fixed later.
434 */
435
436struct handle_s
437{
438 /* Which compound transaction is this update a part of? */
439 transaction_t *h_transaction;
440
441 /* Number of remaining buffers we are allowed to dirty: */
442 int h_buffer_credits;
443
444 /* Reference count on this handle */
445 int h_ref;
446
447 /* Field for caller's use to track errors through large fs */
448 /* operations */
449 int h_err;
450
451 /* Flags [no locking] */
452 unsigned int h_sync: 1; /* sync-on-close */
453 unsigned int h_jdata: 1; /* force data journaling */
454 unsigned int h_aborted: 1; /* fatal error on handle */
Mingming Cao7b751062008-01-28 23:58:27 -0500455
456#ifdef CONFIG_DEBUG_LOCK_ALLOC
457 struct lockdep_map h_lockdep_map;
458#endif
Dave Kleikamp470decc2006-10-11 01:20:57 -0700459};
460
461
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500462/*
463 * Some stats for checkpoint phase
464 */
465struct transaction_chp_stats_s {
466 unsigned long cs_chp_time;
467 unsigned long cs_forced_to_close;
468 unsigned long cs_written;
469 unsigned long cs_dropped;
470};
471
Dave Kleikamp470decc2006-10-11 01:20:57 -0700472/* The transaction_t type is the guts of the journaling mechanism. It
473 * tracks a compound transaction through its various states:
474 *
475 * RUNNING: accepting new updates
476 * LOCKED: Updates still running but we don't accept new ones
477 * RUNDOWN: Updates are tidying up but have finished requesting
478 * new buffers to modify (state not used for now)
479 * FLUSH: All updates complete, but we are still writing to disk
480 * COMMIT: All data on disk, writing commit record
481 * FINISHED: We still have to keep the transaction for checkpointing.
482 *
483 * The transaction keeps track of all of the buffers modified by a
484 * running transaction, and all of the buffers committed but not yet
485 * flushed to home for finished transactions.
486 */
487
488/*
489 * Lock ranking:
490 *
491 * j_list_lock
492 * ->jbd_lock_bh_journal_head() (This is "innermost")
493 *
494 * j_state_lock
495 * ->jbd_lock_bh_state()
496 *
497 * jbd_lock_bh_state()
498 * ->j_list_lock
499 *
500 * j_state_lock
501 * ->t_handle_lock
502 *
503 * j_state_lock
504 * ->j_list_lock (journal_unmap_buffer)
505 *
506 */
507
508struct transaction_s
509{
510 /* Pointer to the journal for this transaction. [no locking] */
511 journal_t *t_journal;
512
513 /* Sequence number for this transaction [no locking] */
514 tid_t t_tid;
515
516 /*
517 * Transaction's current state
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700518 * [no locking - only kjournald2 alters this]
Jan Karaf5a7a6b2008-01-28 23:58:27 -0500519 * [j_list_lock] guards transition of a transaction into T_FINISHED
520 * state and subsequent call of __jbd2_journal_drop_transaction()
Dave Kleikamp470decc2006-10-11 01:20:57 -0700521 * FIXME: needs barriers
522 * KLUDGE: [use j_state_lock]
523 */
524 enum {
525 T_RUNNING,
526 T_LOCKED,
527 T_RUNDOWN,
528 T_FLUSH,
529 T_COMMIT,
530 T_FINISHED
531 } t_state;
532
533 /*
534 * Where in the log does this transaction's commit start? [no locking]
535 */
536 unsigned long t_log_start;
537
538 /* Number of buffers on the t_buffers list [j_list_lock] */
539 int t_nr_buffers;
540
541 /*
542 * Doubly-linked circular list of all buffers reserved but not yet
543 * modified by this transaction [j_list_lock]
544 */
545 struct journal_head *t_reserved_list;
546
547 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700548 * Doubly-linked circular list of all metadata buffers owned by this
549 * transaction [j_list_lock]
550 */
551 struct journal_head *t_buffers;
552
553 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700554 * Doubly-linked circular list of all forget buffers (superseded
555 * buffers which we can un-checkpoint once this transaction commits)
556 * [j_list_lock]
557 */
558 struct journal_head *t_forget;
559
560 /*
561 * Doubly-linked circular list of all buffers still to be flushed before
562 * this transaction can be checkpointed. [j_list_lock]
563 */
564 struct journal_head *t_checkpoint_list;
565
566 /*
567 * Doubly-linked circular list of all buffers submitted for IO while
568 * checkpointing. [j_list_lock]
569 */
570 struct journal_head *t_checkpoint_io_list;
571
572 /*
573 * Doubly-linked circular list of temporary buffers currently undergoing
574 * IO in the log [j_list_lock]
575 */
576 struct journal_head *t_iobuf_list;
577
578 /*
579 * Doubly-linked circular list of metadata buffers being shadowed by log
580 * IO. The IO buffers on the iobuf list and the shadow buffers on this
581 * list match each other one for one at all times. [j_list_lock]
582 */
583 struct journal_head *t_shadow_list;
584
585 /*
586 * Doubly-linked circular list of control buffers being written to the
587 * log. [j_list_lock]
588 */
589 struct journal_head *t_log_list;
590
591 /*
Jan Karac851ed52008-07-11 19:27:31 -0400592 * List of inodes whose data we've modified in data=ordered mode.
593 * [j_list_lock]
594 */
595 struct list_head t_inode_list;
596
597 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700598 * Protects info related to handles
599 */
600 spinlock_t t_handle_lock;
601
602 /*
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500603 * Longest time some handle had to wait for running transaction
604 */
605 unsigned long t_max_wait;
606
607 /*
608 * When transaction started
609 */
610 unsigned long t_start;
611
612 /*
613 * Checkpointing stats [j_checkpoint_sem]
614 */
615 struct transaction_chp_stats_s t_chp_stats;
616
617 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700618 * Number of outstanding updates running on this transaction
619 * [t_handle_lock]
620 */
621 int t_updates;
622
623 /*
624 * Number of buffers reserved for use by all handles in this transaction
625 * handle but not yet modified. [t_handle_lock]
626 */
627 int t_outstanding_credits;
628
629 /*
630 * Forward and backward links for the circular list of all transactions
631 * awaiting checkpoint. [j_list_lock]
632 */
633 transaction_t *t_cpnext, *t_cpprev;
634
635 /*
636 * When will the transaction expire (become due for commit), in jiffies?
637 * [no locking]
638 */
639 unsigned long t_expires;
640
641 /*
Josef Bacike07f7182008-11-26 01:14:26 -0500642 * When this transaction started, in nanoseconds [no locking]
643 */
644 ktime_t t_start_time;
645
646 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700647 * How many handles used this transaction? [t_handle_lock]
648 */
649 int t_handle_count;
650
Theodore Ts'o3e624fc2008-10-16 20:00:24 -0400651 /*
Theodore Ts'o70585482009-03-25 23:35:46 -0400652 * This transaction is being forced and some process is
653 * waiting for it to finish.
654 */
H Hartley Sweeten0ccff1a2009-08-17 22:38:04 -0400655 unsigned int t_synchronous_commit:1;
Theodore Ts'o70585482009-03-25 23:35:46 -0400656
657 /*
Theodore Ts'o3e624fc2008-10-16 20:00:24 -0400658 * For use by the filesystem to store fs-specific data
659 * structures associated with the transaction
660 */
661 struct list_head t_private_list;
Dave Kleikamp470decc2006-10-11 01:20:57 -0700662};
663
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500664struct transaction_run_stats_s {
665 unsigned long rs_wait;
666 unsigned long rs_running;
667 unsigned long rs_locked;
668 unsigned long rs_flushing;
669 unsigned long rs_logging;
670
671 unsigned long rs_handle_count;
672 unsigned long rs_blocks;
673 unsigned long rs_blocks_logged;
674};
675
676struct transaction_stats_s {
677 int ts_type;
678 unsigned long ts_tid;
679 union {
680 struct transaction_run_stats_s run;
681 struct transaction_chp_stats_s chp;
682 } u;
683};
684
685#define JBD2_STATS_RUN 1
686#define JBD2_STATS_CHECKPOINT 2
687
688static inline unsigned long
689jbd2_time_diff(unsigned long start, unsigned long end)
690{
691 if (end >= start)
692 return end - start;
693
694 return end + (MAX_JIFFY_OFFSET - start);
695}
696
Theodore Ts'o1a0d3782008-11-05 00:09:22 -0500697#define JBD2_NR_BATCH 64
698
Dave Kleikamp470decc2006-10-11 01:20:57 -0700699/**
700 * struct journal_s - The journal_s type is the concrete type associated with
701 * journal_t.
702 * @j_flags: General journaling state flags
703 * @j_errno: Is there an outstanding uncleared error on the journal (from a
704 * prior abort)?
705 * @j_sb_buffer: First part of superblock buffer
706 * @j_superblock: Second part of superblock buffer
707 * @j_format_version: Version of the superblock format
708 * @j_state_lock: Protect the various scalars in the journal
709 * @j_barrier_count: Number of processes waiting to create a barrier lock
710 * @j_barrier: The barrier lock itself
711 * @j_running_transaction: The current running transaction..
712 * @j_committing_transaction: the transaction we are pushing to disk
713 * @j_checkpoint_transactions: a linked circular list of all transactions
714 * waiting for checkpointing
715 * @j_wait_transaction_locked: Wait queue for waiting for a locked transaction
716 * to start committing, or for a barrier lock to be released
717 * @j_wait_logspace: Wait queue for waiting for checkpointing to complete
718 * @j_wait_done_commit: Wait queue for waiting for commit to complete
719 * @j_wait_checkpoint: Wait queue to trigger checkpointing
720 * @j_wait_commit: Wait queue to trigger commit
721 * @j_wait_updates: Wait queue to wait for updates to complete
722 * @j_checkpoint_mutex: Mutex for locking against concurrent checkpoints
723 * @j_head: Journal head - identifies the first unused block in the journal
724 * @j_tail: Journal tail - identifies the oldest still-used block in the
725 * journal.
726 * @j_free: Journal free - how many free blocks are there in the journal?
727 * @j_first: The block number of the first usable block
728 * @j_last: The block number one beyond the last usable block
729 * @j_dev: Device where we store the journal
730 * @j_blocksize: blocksize for the location where we store the journal.
731 * @j_blk_offset: starting block offset for into the device where we store the
732 * journal
733 * @j_fs_dev: Device which holds the client fs. For internal journal this will
734 * be equal to j_dev
735 * @j_maxlen: Total maximum capacity of the journal region on disk.
736 * @j_list_lock: Protects the buffer lists and internal buffer state.
737 * @j_inode: Optional inode where we store the journal. If present, all journal
738 * block numbers are mapped into this inode via bmap().
739 * @j_tail_sequence: Sequence number of the oldest transaction in the log
740 * @j_transaction_sequence: Sequence number of the next transaction to grant
741 * @j_commit_sequence: Sequence number of the most recently committed
742 * transaction
743 * @j_commit_request: Sequence number of the most recent transaction wanting
744 * commit
745 * @j_uuid: Uuid of client object.
746 * @j_task: Pointer to the current commit thread for this journal
747 * @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a
748 * single compound commit transaction
749 * @j_commit_interval: What is the maximum transaction lifetime before we begin
750 * a commit?
751 * @j_commit_timer: The timer used to wakeup the commit thread
752 * @j_revoke_lock: Protect the revoke table
753 * @j_revoke: The revoke table - maintains the list of revoked blocks in the
754 * current transaction.
755 * @j_revoke_table: alternate revoke tables for j_revoke
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700756 * @j_wbuf: array of buffer_heads for jbd2_journal_commit_transaction
Dave Kleikamp470decc2006-10-11 01:20:57 -0700757 * @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the
758 * number that will fit in j_blocksize
759 * @j_last_sync_writer: most recent pid which did a synchronous write
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500760 * @j_history: Buffer storing the transactions statistics history
761 * @j_history_max: Maximum number of transactions in the statistics history
762 * @j_history_cur: Current number of transactions in the statistics history
763 * @j_history_lock: Protect the transactions statistics history
764 * @j_proc_entry: procfs entry for the jbd statistics directory
765 * @j_stats: Overall statistics
Dave Kleikamp470decc2006-10-11 01:20:57 -0700766 * @j_private: An opaque pointer to fs-private information.
767 */
768
769struct journal_s
770{
771 /* General journaling state flags [j_state_lock] */
772 unsigned long j_flags;
773
774 /*
775 * Is there an outstanding uncleared error on the journal (from a prior
776 * abort)? [j_state_lock]
777 */
778 int j_errno;
779
780 /* The superblock buffer */
781 struct buffer_head *j_sb_buffer;
782 journal_superblock_t *j_superblock;
783
784 /* Version of the superblock format */
785 int j_format_version;
786
787 /*
788 * Protect the various scalars in the journal
789 */
790 spinlock_t j_state_lock;
791
792 /*
793 * Number of processes waiting to create a barrier lock [j_state_lock]
794 */
795 int j_barrier_count;
796
797 /* The barrier lock itself */
798 struct mutex j_barrier;
799
800 /*
801 * Transactions: The current running transaction...
802 * [j_state_lock] [caller holding open handle]
803 */
804 transaction_t *j_running_transaction;
805
806 /*
807 * the transaction we are pushing to disk
808 * [j_state_lock] [caller holding open handle]
809 */
810 transaction_t *j_committing_transaction;
811
812 /*
813 * ... and a linked circular list of all transactions waiting for
814 * checkpointing. [j_list_lock]
815 */
816 transaction_t *j_checkpoint_transactions;
817
818 /*
819 * Wait queue for waiting for a locked transaction to start committing,
820 * or for a barrier lock to be released
821 */
822 wait_queue_head_t j_wait_transaction_locked;
823
824 /* Wait queue for waiting for checkpointing to complete */
825 wait_queue_head_t j_wait_logspace;
826
827 /* Wait queue for waiting for commit to complete */
828 wait_queue_head_t j_wait_done_commit;
829
830 /* Wait queue to trigger checkpointing */
831 wait_queue_head_t j_wait_checkpoint;
832
833 /* Wait queue to trigger commit */
834 wait_queue_head_t j_wait_commit;
835
836 /* Wait queue to wait for updates to complete */
837 wait_queue_head_t j_wait_updates;
838
839 /* Semaphore for locking against concurrent checkpoints */
840 struct mutex j_checkpoint_mutex;
841
842 /*
Theodore Ts'o1a0d3782008-11-05 00:09:22 -0500843 * List of buffer heads used by the checkpoint routine. This
844 * was moved from jbd2_log_do_checkpoint() to reduce stack
845 * usage. Access to this array is controlled by the
846 * j_checkpoint_mutex. [j_checkpoint_mutex]
847 */
848 struct buffer_head *j_chkpt_bhs[JBD2_NR_BATCH];
849
850 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -0700851 * Journal head: identifies the first unused block in the journal.
852 * [j_state_lock]
853 */
854 unsigned long j_head;
855
856 /*
857 * Journal tail: identifies the oldest still-used block in the journal.
858 * [j_state_lock]
859 */
860 unsigned long j_tail;
861
862 /*
863 * Journal free: how many free blocks are there in the journal?
864 * [j_state_lock]
865 */
866 unsigned long j_free;
867
868 /*
869 * Journal start and end: the block numbers of the first usable block
870 * and one beyond the last usable block in the journal. [j_state_lock]
871 */
872 unsigned long j_first;
873 unsigned long j_last;
874
875 /*
876 * Device, blocksize and starting block offset for the location where we
877 * store the journal.
878 */
879 struct block_device *j_dev;
880 int j_blocksize;
Theodore Ts'o05496762008-09-16 14:36:17 -0400881 unsigned long long j_blk_offset;
882 char j_devname[BDEVNAME_SIZE+24];
Dave Kleikamp470decc2006-10-11 01:20:57 -0700883
884 /*
885 * Device which holds the client fs. For internal journal this will be
886 * equal to j_dev.
887 */
888 struct block_device *j_fs_dev;
889
890 /* Total maximum capacity of the journal region on disk. */
891 unsigned int j_maxlen;
892
893 /*
894 * Protects the buffer lists and internal buffer state.
895 */
896 spinlock_t j_list_lock;
897
898 /* Optional inode where we store the journal. If present, all */
899 /* journal block numbers are mapped into this inode via */
900 /* bmap(). */
901 struct inode *j_inode;
902
903 /*
904 * Sequence number of the oldest transaction in the log [j_state_lock]
905 */
906 tid_t j_tail_sequence;
907
908 /*
909 * Sequence number of the next transaction to grant [j_state_lock]
910 */
911 tid_t j_transaction_sequence;
912
913 /*
914 * Sequence number of the most recently committed transaction
915 * [j_state_lock].
916 */
917 tid_t j_commit_sequence;
918
919 /*
920 * Sequence number of the most recent transaction wanting commit
921 * [j_state_lock]
922 */
923 tid_t j_commit_request;
924
925 /*
926 * Journal uuid: identifies the object (filesystem, LVM volume etc)
927 * backed by this journal. This will eventually be replaced by an array
928 * of uuids, allowing us to index multiple devices within a single
929 * journal and to perform atomic updates across them.
930 */
931 __u8 j_uuid[16];
932
933 /* Pointer to the current commit thread for this journal */
934 struct task_struct *j_task;
935
936 /*
937 * Maximum number of metadata buffers to allow in a single compound
938 * commit transaction
939 */
940 int j_max_transaction_buffers;
941
942 /*
943 * What is the maximum transaction lifetime before we begin a commit?
944 */
945 unsigned long j_commit_interval;
946
947 /* The timer used to wakeup the commit thread: */
948 struct timer_list j_commit_timer;
949
950 /*
951 * The revoke table: maintains the list of revoked blocks in the
952 * current transaction. [j_revoke_lock]
953 */
954 spinlock_t j_revoke_lock;
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700955 struct jbd2_revoke_table_s *j_revoke;
956 struct jbd2_revoke_table_s *j_revoke_table[2];
Dave Kleikamp470decc2006-10-11 01:20:57 -0700957
958 /*
Mingming Caof7f4bcc2006-10-11 01:20:59 -0700959 * array of bhs for jbd2_journal_commit_transaction
Dave Kleikamp470decc2006-10-11 01:20:57 -0700960 */
961 struct buffer_head **j_wbuf;
962 int j_wbufsize;
963
Josef Bacike07f7182008-11-26 01:14:26 -0500964 /*
965 * this is the pid of hte last person to run a synchronous operation
966 * through the journal
967 */
Dave Kleikamp470decc2006-10-11 01:20:57 -0700968 pid_t j_last_sync_writer;
969
Josef Bacike07f7182008-11-26 01:14:26 -0500970 /*
971 * the average amount of time in nanoseconds it takes to commit a
972 * transaction to disk. [j_state_lock]
973 */
974 u64 j_average_commit_time;
975
Theodore Ts'o30773842009-01-03 20:27:38 -0500976 /*
977 * minimum and maximum times that we should wait for
978 * additional filesystem operations to get batched into a
979 * synchronous handle in microseconds
980 */
981 u32 j_min_batch_time;
982 u32 j_max_batch_time;
983
Theodore Ts'o3e624fc2008-10-16 20:00:24 -0400984 /* This function is called when a transaction is closed */
985 void (*j_commit_callback)(journal_t *,
986 transaction_t *);
987
Dave Kleikamp470decc2006-10-11 01:20:57 -0700988 /*
Johann Lombardi8e85fb32008-01-28 23:58:27 -0500989 * Journal statistics
990 */
991 struct transaction_stats_s *j_history;
992 int j_history_max;
993 int j_history_cur;
994 /*
995 * Protect the transactions statistics history
996 */
997 spinlock_t j_history_lock;
998 struct proc_dir_entry *j_proc_entry;
999 struct transaction_stats_s j_stats;
1000
Theodore Ts'o624080e2008-06-06 17:50:40 -04001001 /* Failed journal commit ID */
1002 unsigned int j_failed_commit;
1003
Johann Lombardi8e85fb32008-01-28 23:58:27 -05001004 /*
Dave Kleikamp470decc2006-10-11 01:20:57 -07001005 * An opaque pointer to fs-private information. ext3 puts its
1006 * superblock pointer here
1007 */
1008 void *j_private;
1009};
1010
1011/*
1012 * Journal flag definitions
1013 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001014#define JBD2_UNMOUNT 0x001 /* Journal thread is being destroyed */
1015#define JBD2_ABORT 0x002 /* Journaling has been aborted for errors. */
1016#define JBD2_ACK_ERR 0x004 /* The errno in the sb has been acked */
1017#define JBD2_FLUSHED 0x008 /* The journal superblock has been flushed */
1018#define JBD2_LOADED 0x010 /* The journal superblock has been loaded */
1019#define JBD2_BARRIER 0x020 /* Use IDE barriers */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001020#define JBD2_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file
1021 * data write error in ordered
1022 * mode */
Dave Kleikamp470decc2006-10-11 01:20:57 -07001023
1024/*
1025 * Function declarations for the journaling transaction and buffer
1026 * management
1027 */
1028
1029/* Filing buffers */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001030extern void jbd2_journal_unfile_buffer(journal_t *, struct journal_head *);
1031extern void __jbd2_journal_unfile_buffer(struct journal_head *);
1032extern void __jbd2_journal_refile_buffer(struct journal_head *);
1033extern void jbd2_journal_refile_buffer(journal_t *, struct journal_head *);
1034extern void __jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001035extern void __journal_free_buffer(struct journal_head *bh);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001036extern void jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001037extern void __journal_clean_data_list(transaction_t *transaction);
1038
1039/* Log buffer allocation */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001040extern struct journal_head * jbd2_journal_get_descriptor_buffer(journal_t *);
Mingming Cao18eba7a2006-10-11 01:21:13 -07001041int jbd2_journal_next_log_block(journal_t *, unsigned long long *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001042
1043/* Commit management */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001044extern void jbd2_journal_commit_transaction(journal_t *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001045
1046/* Checkpoint list management */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001047int __jbd2_journal_clean_checkpoint_list(journal_t *journal);
1048int __jbd2_journal_remove_checkpoint(struct journal_head *);
1049void __jbd2_journal_insert_checkpoint(struct journal_head *, transaction_t *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001050
Joel Beckere06c8222008-09-11 15:35:47 -07001051
1052/*
1053 * Triggers
1054 */
1055
1056struct jbd2_buffer_trigger_type {
1057 /*
1058 * Fired just before a buffer is written to the journal.
1059 * mapped_data is a mapped buffer that is the frozen data for
1060 * commit.
1061 */
1062 void (*t_commit)(struct jbd2_buffer_trigger_type *type,
1063 struct buffer_head *bh, void *mapped_data,
1064 size_t size);
1065
1066 /*
1067 * Fired during journal abort for dirty buffers that will not be
1068 * committed.
1069 */
1070 void (*t_abort)(struct jbd2_buffer_trigger_type *type,
1071 struct buffer_head *bh);
1072};
1073
1074extern void jbd2_buffer_commit_trigger(struct journal_head *jh,
1075 void *mapped_data,
1076 struct jbd2_buffer_trigger_type *triggers);
1077extern void jbd2_buffer_abort_trigger(struct journal_head *jh,
1078 struct jbd2_buffer_trigger_type *triggers);
1079
Dave Kleikamp470decc2006-10-11 01:20:57 -07001080/* Buffer IO */
1081extern int
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001082jbd2_journal_write_metadata_buffer(transaction_t *transaction,
Dave Kleikamp470decc2006-10-11 01:20:57 -07001083 struct journal_head *jh_in,
1084 struct journal_head **jh_out,
Mingming Cao18eba7a2006-10-11 01:21:13 -07001085 unsigned long long blocknr);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001086
1087/* Transaction locking */
1088extern void __wait_on_journal (journal_t *);
1089
1090/*
1091 * Journal locking.
1092 *
1093 * We need to lock the journal during transaction state changes so that nobody
1094 * ever tries to take a handle on the running transaction while we are in the
1095 * middle of moving it to the commit phase. j_state_lock does this.
1096 *
1097 * Note that the locking is completely interrupt unsafe. We never touch
1098 * journal structures from interrupts.
1099 */
1100
1101static inline handle_t *journal_current_handle(void)
1102{
1103 return current->journal_info;
1104}
1105
1106/* The journaling code user interface:
1107 *
1108 * Create and destroy handles
1109 * Register buffer modifications against the current transaction.
1110 */
1111
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001112extern handle_t *jbd2_journal_start(journal_t *, int nblocks);
1113extern int jbd2_journal_restart (handle_t *, int nblocks);
1114extern int jbd2_journal_extend (handle_t *, int nblocks);
1115extern int jbd2_journal_get_write_access(handle_t *, struct buffer_head *);
1116extern int jbd2_journal_get_create_access (handle_t *, struct buffer_head *);
1117extern int jbd2_journal_get_undo_access(handle_t *, struct buffer_head *);
Joel Beckere06c8222008-09-11 15:35:47 -07001118void jbd2_journal_set_triggers(struct buffer_head *,
1119 struct jbd2_buffer_trigger_type *type);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001120extern int jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *);
1121extern void jbd2_journal_release_buffer (handle_t *, struct buffer_head *);
1122extern int jbd2_journal_forget (handle_t *, struct buffer_head *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001123extern void journal_sync_buffer (struct buffer_head *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001124extern void jbd2_journal_invalidatepage(journal_t *,
Dave Kleikamp470decc2006-10-11 01:20:57 -07001125 struct page *, unsigned long);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001126extern int jbd2_journal_try_to_free_buffers(journal_t *, struct page *, gfp_t);
1127extern int jbd2_journal_stop(handle_t *);
1128extern int jbd2_journal_flush (journal_t *);
1129extern void jbd2_journal_lock_updates (journal_t *);
1130extern void jbd2_journal_unlock_updates (journal_t *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001131
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001132extern journal_t * jbd2_journal_init_dev(struct block_device *bdev,
Dave Kleikamp470decc2006-10-11 01:20:57 -07001133 struct block_device *fs_dev,
Mingming Cao18eba7a2006-10-11 01:21:13 -07001134 unsigned long long start, int len, int bsize);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001135extern journal_t * jbd2_journal_init_inode (struct inode *);
1136extern int jbd2_journal_update_format (journal_t *);
1137extern int jbd2_journal_check_used_features
Dave Kleikamp470decc2006-10-11 01:20:57 -07001138 (journal_t *, unsigned long, unsigned long, unsigned long);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001139extern int jbd2_journal_check_available_features
Dave Kleikamp470decc2006-10-11 01:20:57 -07001140 (journal_t *, unsigned long, unsigned long, unsigned long);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001141extern int jbd2_journal_set_features
Dave Kleikamp470decc2006-10-11 01:20:57 -07001142 (journal_t *, unsigned long, unsigned long, unsigned long);
Girish Shilamkar818d2762008-01-28 23:58:27 -05001143extern void jbd2_journal_clear_features
1144 (journal_t *, unsigned long, unsigned long, unsigned long);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001145extern int jbd2_journal_load (journal_t *journal);
Hidehiro Kawai44519fa2008-10-10 20:29:13 -04001146extern int jbd2_journal_destroy (journal_t *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001147extern int jbd2_journal_recover (journal_t *journal);
1148extern int jbd2_journal_wipe (journal_t *, int);
1149extern int jbd2_journal_skip_recovery (journal_t *);
1150extern void jbd2_journal_update_superblock (journal_t *, int);
1151extern void __jbd2_journal_abort_hard (journal_t *);
1152extern void jbd2_journal_abort (journal_t *, int);
1153extern int jbd2_journal_errno (journal_t *);
1154extern void jbd2_journal_ack_err (journal_t *);
1155extern int jbd2_journal_clear_err (journal_t *);
Mingming Cao18eba7a2006-10-11 01:21:13 -07001156extern int jbd2_journal_bmap(journal_t *, unsigned long, unsigned long long *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001157extern int jbd2_journal_force_commit(journal_t *);
Jan Karac851ed52008-07-11 19:27:31 -04001158extern int jbd2_journal_file_inode(handle_t *handle, struct jbd2_inode *inode);
Jan Kara7f5aa212009-02-10 11:15:34 -05001159extern int jbd2_journal_begin_ordered_truncate(journal_t *journal,
1160 struct jbd2_inode *inode, loff_t new_size);
Jan Karac851ed52008-07-11 19:27:31 -04001161extern void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode);
1162extern void jbd2_journal_release_jbd_inode(journal_t *journal, struct jbd2_inode *jinode);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001163
1164/*
1165 * journal_head management
1166 */
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001167struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh);
1168struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh);
1169void jbd2_journal_remove_journal_head(struct buffer_head *bh);
1170void jbd2_journal_put_journal_head(struct journal_head *jh);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001171
1172/*
1173 * handle management
1174 */
Christoph Lametere18b8902006-12-06 20:33:20 -08001175extern struct kmem_cache *jbd2_handle_cache;
Dave Kleikamp470decc2006-10-11 01:20:57 -07001176
Mingming Caoaf1e76d2007-10-16 18:38:25 -04001177static inline handle_t *jbd2_alloc_handle(gfp_t gfp_flags)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001178{
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001179 return kmem_cache_alloc(jbd2_handle_cache, gfp_flags);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001180}
1181
Mingming Caoaf1e76d2007-10-16 18:38:25 -04001182static inline void jbd2_free_handle(handle_t *handle)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001183{
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001184 kmem_cache_free(jbd2_handle_cache, handle);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001185}
1186
1187/* Primary revoke support */
1188#define JOURNAL_REVOKE_DEFAULT_HASH 256
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001189extern int jbd2_journal_init_revoke(journal_t *, int);
1190extern void jbd2_journal_destroy_revoke_caches(void);
1191extern int jbd2_journal_init_revoke_caches(void);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001192
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001193extern void jbd2_journal_destroy_revoke(journal_t *);
Mingming Cao18eba7a2006-10-11 01:21:13 -07001194extern int jbd2_journal_revoke (handle_t *, unsigned long long, struct buffer_head *);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001195extern int jbd2_journal_cancel_revoke(handle_t *, struct journal_head *);
Theodore Ts'o67c457a2009-04-14 07:50:56 -04001196extern void jbd2_journal_write_revoke_records(journal_t *,
1197 transaction_t *, int);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001198
1199/* Recovery revoke support */
Mingming Cao18eba7a2006-10-11 01:21:13 -07001200extern int jbd2_journal_set_revoke(journal_t *, unsigned long long, tid_t);
1201extern int jbd2_journal_test_revoke(journal_t *, unsigned long long, tid_t);
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001202extern void jbd2_journal_clear_revoke(journal_t *);
1203extern void jbd2_journal_switch_revoke_table(journal_t *journal);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001204
1205/*
1206 * The log thread user interface:
1207 *
1208 * Request space in the current transaction, and force transaction commit
1209 * transitions on demand.
1210 */
1211
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001212int __jbd2_log_space_left(journal_t *); /* Called with journal locked */
1213int jbd2_log_start_commit(journal_t *journal, tid_t tid);
1214int __jbd2_log_start_commit(journal_t *journal, tid_t tid);
1215int jbd2_journal_start_commit(journal_t *journal, tid_t *tid);
1216int jbd2_journal_force_commit_nested(journal_t *journal);
1217int jbd2_log_wait_commit(journal_t *journal, tid_t tid);
1218int jbd2_log_do_checkpoint(journal_t *journal);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001219
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001220void __jbd2_log_wait_for_space(journal_t *journal);
Aneesh Kumar K.Vfb684072008-11-06 17:50:21 -05001221extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *);
1222extern int jbd2_cleanup_journal_tail(journal_t *);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001223
1224/* Debugging code only: */
1225
1226#define jbd_ENOSYS() \
1227do { \
Harvey Harrisond5c003b2008-10-15 22:01:24 -07001228 printk (KERN_ERR "JBD unimplemented function %s\n", __func__); \
Dave Kleikamp470decc2006-10-11 01:20:57 -07001229 current->state = TASK_UNINTERRUPTIBLE; \
1230 schedule(); \
1231} while (1)
1232
1233/*
1234 * is_journal_abort
1235 *
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001236 * Simple test wrapper function to test the JBD2_ABORT state flag. This
Dave Kleikamp470decc2006-10-11 01:20:57 -07001237 * bit, when set, indicates that we have had a fatal error somewhere,
1238 * either inside the journaling layer or indicated to us by the client
1239 * (eg. ext3), and that we and should not commit any further
1240 * transactions.
1241 */
1242
1243static inline int is_journal_aborted(journal_t *journal)
1244{
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001245 return journal->j_flags & JBD2_ABORT;
Dave Kleikamp470decc2006-10-11 01:20:57 -07001246}
1247
1248static inline int is_handle_aborted(handle_t *handle)
1249{
1250 if (handle->h_aborted)
1251 return 1;
1252 return is_journal_aborted(handle->h_transaction->t_journal);
1253}
1254
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001255static inline void jbd2_journal_abort_handle(handle_t *handle)
Dave Kleikamp470decc2006-10-11 01:20:57 -07001256{
1257 handle->h_aborted = 1;
1258}
1259
1260#endif /* __KERNEL__ */
1261
1262/* Comparison functions for transaction IDs: perform comparisons using
1263 * modulo arithmetic so that they work over sequence number wraps. */
1264
1265static inline int tid_gt(tid_t x, tid_t y)
1266{
1267 int difference = (x - y);
1268 return (difference > 0);
1269}
1270
1271static inline int tid_geq(tid_t x, tid_t y)
1272{
1273 int difference = (x - y);
1274 return (difference >= 0);
1275}
1276
Mingming Caof7f4bcc2006-10-11 01:20:59 -07001277extern int jbd2_journal_blocks_per_page(struct inode *inode);
Zach Brownb517bea2006-10-11 01:21:08 -07001278extern size_t journal_tag_bytes(journal_t *journal);
Dave Kleikamp470decc2006-10-11 01:20:57 -07001279
1280/*
1281 * Return the minimum number of blocks which must be free in the journal
1282 * before a new transaction may be started. Must be called under j_state_lock.
1283 */
1284static inline int jbd_space_needed(journal_t *journal)
1285{
1286 int nblocks = journal->j_max_transaction_buffers;
1287 if (journal->j_committing_transaction)
1288 nblocks += journal->j_committing_transaction->
1289 t_outstanding_credits;
1290 return nblocks;
1291}
1292
1293/*
1294 * Definitions which augment the buffer_head layer
1295 */
1296
1297/* journaling buffer types */
1298#define BJ_None 0 /* Not journaled */
Jan Kara87c89c22008-07-11 19:27:31 -04001299#define BJ_Metadata 1 /* Normal journaled metadata */
1300#define BJ_Forget 2 /* Buffer superseded by this transaction */
1301#define BJ_IO 3 /* Buffer is for temporary IO use */
1302#define BJ_Shadow 4 /* Buffer contents being shadowed to the log */
1303#define BJ_LogCtl 5 /* Buffer contains log descriptors */
1304#define BJ_Reserved 6 /* Buffer is reserved for access by journal */
1305#define BJ_Types 7
Dave Kleikamp470decc2006-10-11 01:20:57 -07001306
1307extern int jbd_blocks_per_page(struct inode *inode);
1308
1309#ifdef __KERNEL__
1310
1311#define buffer_trace_init(bh) do {} while (0)
1312#define print_buffer_fields(bh) do {} while (0)
1313#define print_buffer_trace(bh) do {} while (0)
1314#define BUFFER_TRACE(bh, info) do {} while (0)
1315#define BUFFER_TRACE2(bh, bh2, info) do {} while (0)
1316#define JBUFFER_TRACE(jh, info) do {} while (0)
1317
Theodore Ts'o879c5e62009-06-17 11:47:48 -04001318/*
1319 * jbd2_dev_to_name is a utility function used by the jbd2 and ext4
1320 * tracing infrastructure to map a dev_t to a device name.
1321 */
1322extern const char *jbd2_dev_to_name(dev_t device);
1323
Dave Kleikamp470decc2006-10-11 01:20:57 -07001324#endif /* __KERNEL__ */
1325
Mingming Caocd02ff02007-10-16 18:38:25 -04001326#endif /* _LINUX_JBD2_H */