Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/include/linux/jbd.h | |
ae6ddcc5 | 3 | * |
1da177e4 LT |
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 | ||
16 | #ifndef _LINUX_JBD_H | |
17 | #define _LINUX_JBD_H | |
18 | ||
1da177e4 LT |
19 | /* Allow this file to be included directly into e2fsprogs */ |
20 | #ifndef __KERNEL__ | |
21 | #include "jfs_compat.h" | |
22 | #define JFS_DEBUG | |
23 | #define jfs_debug jbd_debug | |
24 | #else | |
25 | ||
fe1dcbc4 | 26 | #include <linux/types.h> |
1da177e4 LT |
27 | #include <linux/buffer_head.h> |
28 | #include <linux/journal-head.h> | |
29 | #include <linux/stddef.h> | |
fb1c8f93 | 30 | #include <linux/bit_spinlock.h> |
2c68ee75 | 31 | #include <linux/mutex.h> |
e3df1898 | 32 | #include <linux/timer.h> |
34a3d1e8 | 33 | #include <linux/lockdep.h> |
e3df1898 | 34 | |
1da177e4 LT |
35 | #define journal_oom_retry 1 |
36 | ||
37 | /* | |
0cbfdc86 | 38 | * Define JBD_PARANOID_IOFAIL to cause a kernel BUG() if ext3 finds |
1da177e4 LT |
39 | * certain classes of error which can occur due to failed IOs. Under |
40 | * normal use we want ext3 to continue after such errors, because | |
41 | * hardware _can_ fail, but for debugging purposes when running tests on | |
42 | * known-good hardware we may want to trap these errors. | |
43 | */ | |
44 | #undef JBD_PARANOID_IOFAIL | |
45 | ||
46 | /* | |
47 | * The default maximum commit age, in seconds. | |
48 | */ | |
49 | #define JBD_DEFAULT_MAX_COMMIT_AGE 5 | |
50 | ||
51 | #ifdef CONFIG_JBD_DEBUG | |
52 | /* | |
53 | * Define JBD_EXPENSIVE_CHECKING to enable more expensive internal | |
54 | * consistency checks. By default we don't do this unless | |
55 | * CONFIG_JBD_DEBUG is on. | |
56 | */ | |
57 | #define JBD_EXPENSIVE_CHECKING | |
c2a9159c | 58 | extern u8 journal_enable_debug; |
1da177e4 LT |
59 | |
60 | #define jbd_debug(n, f, a...) \ | |
61 | do { \ | |
62 | if ((n) <= journal_enable_debug) { \ | |
63 | printk (KERN_DEBUG "(%s, %d): %s: ", \ | |
d5c003b4 | 64 | __FILE__, __LINE__, __func__); \ |
e9ad5620 | 65 | printk (f, ## a); \ |
1da177e4 LT |
66 | } \ |
67 | } while (0) | |
68 | #else | |
69 | #define jbd_debug(f, a...) /**/ | |
70 | #endif | |
71 | ||
c089d490 MC |
72 | static inline void *jbd_alloc(size_t size, gfp_t flags) |
73 | { | |
74 | return (void *)__get_free_pages(flags, get_order(size)); | |
75 | } | |
76 | ||
77 | static inline void jbd_free(void *ptr, size_t size) | |
78 | { | |
79 | free_pages((unsigned long)ptr, get_order(size)); | |
80 | }; | |
81 | ||
1da177e4 LT |
82 | #define JFS_MIN_JOURNAL_BLOCKS 1024 |
83 | ||
1da177e4 LT |
84 | |
85 | /** | |
86 | * typedef handle_t - The handle_t type represents a single atomic update being performed by some process. | |
87 | * | |
88 | * All filesystem modifications made by the process go | |
89 | * through this handle. Recursive operations (such as quota operations) | |
90 | * are gathered into a single update. | |
91 | * | |
92 | * The buffer credits field is used to account for journaled buffers | |
93 | * being modified by the running process. To ensure that there is | |
94 | * enough log space for all outstanding operations, we need to limit the | |
95 | * number of outstanding buffers possible at any time. When the | |
96 | * operation completes, any buffer credits not used are credited back to | |
97 | * the transaction, so that at all times we know how many buffers the | |
ae6ddcc5 MC |
98 | * outstanding updates on a transaction might possibly touch. |
99 | * | |
1da177e4 LT |
100 | * This is an opaque datatype. |
101 | **/ | |
102 | typedef struct handle_s handle_t; /* Atomic operation type */ | |
103 | ||
104 | ||
105 | /** | |
106 | * typedef journal_t - The journal_t maintains all of the journaling state information for a single filesystem. | |
107 | * | |
108 | * journal_t is linked to from the fs superblock structure. | |
ae6ddcc5 | 109 | * |
1da177e4 LT |
110 | * We use the journal_t to keep track of all outstanding transaction |
111 | * activity on the filesystem, and to manage the state of the log | |
112 | * writing process. | |
113 | * | |
114 | * This is an opaque datatype. | |
115 | **/ | |
116 | typedef struct journal_s journal_t; /* Journal control structure */ | |
117 | #endif | |
118 | ||
119 | /* | |
120 | * Internal structures used by the logging mechanism: | |
121 | */ | |
122 | ||
123 | #define JFS_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */ | |
124 | ||
125 | /* | |
126 | * On-disk structures | |
127 | */ | |
128 | ||
ae6ddcc5 | 129 | /* |
1da177e4 LT |
130 | * Descriptor block types: |
131 | */ | |
132 | ||
133 | #define JFS_DESCRIPTOR_BLOCK 1 | |
134 | #define JFS_COMMIT_BLOCK 2 | |
135 | #define JFS_SUPERBLOCK_V1 3 | |
136 | #define JFS_SUPERBLOCK_V2 4 | |
137 | #define JFS_REVOKE_BLOCK 5 | |
138 | ||
139 | /* | |
140 | * Standard header for all descriptor blocks: | |
141 | */ | |
142 | typedef struct journal_header_s | |
143 | { | |
144 | __be32 h_magic; | |
145 | __be32 h_blocktype; | |
146 | __be32 h_sequence; | |
147 | } journal_header_t; | |
148 | ||
149 | ||
ae6ddcc5 MC |
150 | /* |
151 | * The block tag: used to describe a single buffer in the journal | |
1da177e4 LT |
152 | */ |
153 | typedef struct journal_block_tag_s | |
154 | { | |
155 | __be32 t_blocknr; /* The on-disk block number */ | |
156 | __be32 t_flags; /* See below */ | |
157 | } journal_block_tag_t; | |
158 | ||
ae6ddcc5 | 159 | /* |
1da177e4 | 160 | * The revoke descriptor: used on disk to describe a series of blocks to |
ae6ddcc5 | 161 | * be revoked from the log |
1da177e4 LT |
162 | */ |
163 | typedef struct journal_revoke_header_s | |
164 | { | |
165 | journal_header_t r_header; | |
166 | __be32 r_count; /* Count of bytes used in the block */ | |
167 | } journal_revoke_header_t; | |
168 | ||
169 | ||
170 | /* Definitions for the journal tag flags word: */ | |
171 | #define JFS_FLAG_ESCAPE 1 /* on-disk block is escaped */ | |
172 | #define JFS_FLAG_SAME_UUID 2 /* block has same uuid as previous */ | |
173 | #define JFS_FLAG_DELETED 4 /* block deleted by this transaction */ | |
174 | #define JFS_FLAG_LAST_TAG 8 /* last tag in this descriptor block */ | |
175 | ||
176 | ||
177 | /* | |
178 | * The journal superblock. All fields are in big-endian byte order. | |
179 | */ | |
180 | typedef struct journal_superblock_s | |
181 | { | |
182 | /* 0x0000 */ | |
183 | journal_header_t s_header; | |
184 | ||
185 | /* 0x000C */ | |
186 | /* Static information describing the journal */ | |
187 | __be32 s_blocksize; /* journal device blocksize */ | |
188 | __be32 s_maxlen; /* total blocks in journal file */ | |
189 | __be32 s_first; /* first block of log information */ | |
190 | ||
191 | /* 0x0018 */ | |
192 | /* Dynamic information describing the current state of the log */ | |
193 | __be32 s_sequence; /* first commit ID expected in log */ | |
194 | __be32 s_start; /* blocknr of start of log */ | |
195 | ||
196 | /* 0x0020 */ | |
197 | /* Error value, as set by journal_abort(). */ | |
198 | __be32 s_errno; | |
199 | ||
200 | /* 0x0024 */ | |
201 | /* Remaining fields are only valid in a version-2 superblock */ | |
e9ad5620 DK |
202 | __be32 s_feature_compat; /* compatible feature set */ |
203 | __be32 s_feature_incompat; /* incompatible feature set */ | |
204 | __be32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
1da177e4 LT |
205 | /* 0x0030 */ |
206 | __u8 s_uuid[16]; /* 128-bit uuid for journal */ | |
207 | ||
208 | /* 0x0040 */ | |
209 | __be32 s_nr_users; /* Nr of filesystems sharing log */ | |
210 | ||
211 | __be32 s_dynsuper; /* Blocknr of dynamic superblock copy*/ | |
212 | ||
213 | /* 0x0048 */ | |
214 | __be32 s_max_transaction; /* Limit of journal blocks per trans.*/ | |
215 | __be32 s_max_trans_data; /* Limit of data blocks per trans. */ | |
216 | ||
217 | /* 0x0050 */ | |
218 | __u32 s_padding[44]; | |
219 | ||
220 | /* 0x0100 */ | |
221 | __u8 s_users[16*48]; /* ids of all fs'es sharing the log */ | |
222 | /* 0x0400 */ | |
223 | } journal_superblock_t; | |
224 | ||
225 | #define JFS_HAS_COMPAT_FEATURE(j,mask) \ | |
226 | ((j)->j_format_version >= 2 && \ | |
227 | ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask)))) | |
228 | #define JFS_HAS_RO_COMPAT_FEATURE(j,mask) \ | |
229 | ((j)->j_format_version >= 2 && \ | |
230 | ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask)))) | |
231 | #define JFS_HAS_INCOMPAT_FEATURE(j,mask) \ | |
232 | ((j)->j_format_version >= 2 && \ | |
233 | ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask)))) | |
234 | ||
235 | #define JFS_FEATURE_INCOMPAT_REVOKE 0x00000001 | |
236 | ||
237 | /* Features known to this kernel version: */ | |
238 | #define JFS_KNOWN_COMPAT_FEATURES 0 | |
239 | #define JFS_KNOWN_ROCOMPAT_FEATURES 0 | |
240 | #define JFS_KNOWN_INCOMPAT_FEATURES JFS_FEATURE_INCOMPAT_REVOKE | |
241 | ||
242 | #ifdef __KERNEL__ | |
243 | ||
244 | #include <linux/fs.h> | |
245 | #include <linux/sched.h> | |
1da177e4 | 246 | |
1c099244 | 247 | #define J_ASSERT(assert) BUG_ON(!(assert)) |
1da177e4 | 248 | |
1da177e4 LT |
249 | #define J_ASSERT_BH(bh, expr) J_ASSERT(expr) |
250 | #define J_ASSERT_JH(jh, expr) J_ASSERT(expr) | |
1da177e4 | 251 | |
1da177e4 LT |
252 | #if defined(JBD_PARANOID_IOFAIL) |
253 | #define J_EXPECT(expr, why...) J_ASSERT(expr) | |
254 | #define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr) | |
255 | #define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr) | |
256 | #else | |
257 | #define __journal_expect(expr, why...) \ | |
258 | ({ \ | |
259 | int val = (expr); \ | |
260 | if (!val) { \ | |
261 | printk(KERN_ERR \ | |
262 | "EXT3-fs unexpected failure: %s;\n",# expr); \ | |
263 | printk(KERN_ERR why "\n"); \ | |
264 | } \ | |
265 | val; \ | |
266 | }) | |
267 | #define J_EXPECT(expr, why...) __journal_expect(expr, ## why) | |
268 | #define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why) | |
269 | #define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why) | |
270 | #endif | |
271 | ||
272 | enum jbd_state_bits { | |
273 | BH_JBD /* Has an attached ext3 journal_head */ | |
274 | = BH_PrivateStart, | |
275 | BH_JWrite, /* Being written to log (@@@ DEBUGGING) */ | |
276 | BH_Freed, /* Has been freed (truncated) */ | |
277 | BH_Revoked, /* Has been revoked from the log */ | |
278 | BH_RevokeValid, /* Revoked flag is valid */ | |
279 | BH_JBDDirty, /* Is dirty but journaled */ | |
280 | BH_State, /* Pins most journal_head state */ | |
281 | BH_JournalHead, /* Pins bh->b_private and jh->b_bh */ | |
282 | BH_Unshadow, /* Dummy bit, for BJ_Shadow wakeup filtering */ | |
283 | }; | |
284 | ||
285 | BUFFER_FNS(JBD, jbd) | |
286 | BUFFER_FNS(JWrite, jwrite) | |
287 | BUFFER_FNS(JBDDirty, jbddirty) | |
288 | TAS_BUFFER_FNS(JBDDirty, jbddirty) | |
289 | BUFFER_FNS(Revoked, revoked) | |
290 | TAS_BUFFER_FNS(Revoked, revoked) | |
291 | BUFFER_FNS(RevokeValid, revokevalid) | |
292 | TAS_BUFFER_FNS(RevokeValid, revokevalid) | |
293 | BUFFER_FNS(Freed, freed) | |
294 | ||
295 | static inline struct buffer_head *jh2bh(struct journal_head *jh) | |
296 | { | |
297 | return jh->b_bh; | |
298 | } | |
299 | ||
300 | static inline struct journal_head *bh2jh(struct buffer_head *bh) | |
301 | { | |
302 | return bh->b_private; | |
303 | } | |
304 | ||
305 | static inline void jbd_lock_bh_state(struct buffer_head *bh) | |
306 | { | |
307 | bit_spin_lock(BH_State, &bh->b_state); | |
308 | } | |
309 | ||
310 | static inline int jbd_trylock_bh_state(struct buffer_head *bh) | |
311 | { | |
312 | return bit_spin_trylock(BH_State, &bh->b_state); | |
313 | } | |
314 | ||
315 | static inline int jbd_is_locked_bh_state(struct buffer_head *bh) | |
316 | { | |
317 | return bit_spin_is_locked(BH_State, &bh->b_state); | |
318 | } | |
319 | ||
320 | static inline void jbd_unlock_bh_state(struct buffer_head *bh) | |
321 | { | |
322 | bit_spin_unlock(BH_State, &bh->b_state); | |
323 | } | |
324 | ||
325 | static inline void jbd_lock_bh_journal_head(struct buffer_head *bh) | |
326 | { | |
327 | bit_spin_lock(BH_JournalHead, &bh->b_state); | |
328 | } | |
329 | ||
330 | static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh) | |
331 | { | |
332 | bit_spin_unlock(BH_JournalHead, &bh->b_state); | |
333 | } | |
334 | ||
335 | struct jbd_revoke_table_s; | |
336 | ||
337 | /** | |
a6b91919 | 338 | * struct handle_s - this is the concrete type associated with handle_t. |
1da177e4 LT |
339 | * @h_transaction: Which compound transaction is this update a part of? |
340 | * @h_buffer_credits: Number of remaining buffers we are allowed to dirty. | |
341 | * @h_ref: Reference count on this handle | |
342 | * @h_err: Field for caller's use to track errors through large fs operations | |
343 | * @h_sync: flag for sync-on-close | |
344 | * @h_jdata: flag to force data journaling | |
345 | * @h_aborted: flag indicating fatal error on handle | |
e6716b87 | 346 | * @h_lockdep_map: lockdep info for debugging lock problems |
1da177e4 | 347 | */ |
ae6ddcc5 | 348 | struct handle_s |
1da177e4 LT |
349 | { |
350 | /* Which compound transaction is this update a part of? */ | |
351 | transaction_t *h_transaction; | |
352 | ||
353 | /* Number of remaining buffers we are allowed to dirty: */ | |
354 | int h_buffer_credits; | |
355 | ||
356 | /* Reference count on this handle */ | |
357 | int h_ref; | |
358 | ||
359 | /* Field for caller's use to track errors through large fs */ | |
360 | /* operations */ | |
361 | int h_err; | |
362 | ||
363 | /* Flags [no locking] */ | |
364 | unsigned int h_sync: 1; /* sync-on-close */ | |
365 | unsigned int h_jdata: 1; /* force data journaling */ | |
366 | unsigned int h_aborted: 1; /* fatal error on handle */ | |
34a3d1e8 PZ |
367 | |
368 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
369 | struct lockdep_map h_lockdep_map; | |
370 | #endif | |
1da177e4 LT |
371 | }; |
372 | ||
373 | ||
374 | /* The transaction_t type is the guts of the journaling mechanism. It | |
375 | * tracks a compound transaction through its various states: | |
376 | * | |
377 | * RUNNING: accepting new updates | |
378 | * LOCKED: Updates still running but we don't accept new ones | |
379 | * RUNDOWN: Updates are tidying up but have finished requesting | |
380 | * new buffers to modify (state not used for now) | |
381 | * FLUSH: All updates complete, but we are still writing to disk | |
382 | * COMMIT: All data on disk, writing commit record | |
383 | * FINISHED: We still have to keep the transaction for checkpointing. | |
384 | * | |
385 | * The transaction keeps track of all of the buffers modified by a | |
386 | * running transaction, and all of the buffers committed but not yet | |
387 | * flushed to home for finished transactions. | |
388 | */ | |
389 | ||
390 | /* | |
391 | * Lock ranking: | |
392 | * | |
393 | * j_list_lock | |
394 | * ->jbd_lock_bh_journal_head() (This is "innermost") | |
395 | * | |
396 | * j_state_lock | |
397 | * ->jbd_lock_bh_state() | |
398 | * | |
399 | * jbd_lock_bh_state() | |
400 | * ->j_list_lock | |
401 | * | |
402 | * j_state_lock | |
403 | * ->t_handle_lock | |
404 | * | |
405 | * j_state_lock | |
406 | * ->j_list_lock (journal_unmap_buffer) | |
407 | * | |
408 | */ | |
409 | ||
ae6ddcc5 | 410 | struct transaction_s |
1da177e4 LT |
411 | { |
412 | /* Pointer to the journal for this transaction. [no locking] */ | |
413 | journal_t *t_journal; | |
414 | ||
415 | /* Sequence number for this transaction [no locking] */ | |
416 | tid_t t_tid; | |
417 | ||
418 | /* | |
419 | * Transaction's current state | |
420 | * [no locking - only kjournald alters this] | |
d4beaf4a JK |
421 | * [j_list_lock] guards transition of a transaction into T_FINISHED |
422 | * state and subsequent call of __journal_drop_transaction() | |
1da177e4 LT |
423 | * FIXME: needs barriers |
424 | * KLUDGE: [use j_state_lock] | |
425 | */ | |
426 | enum { | |
427 | T_RUNNING, | |
428 | T_LOCKED, | |
429 | T_RUNDOWN, | |
430 | T_FLUSH, | |
431 | T_COMMIT, | |
ae6ddcc5 | 432 | T_FINISHED |
1da177e4 LT |
433 | } t_state; |
434 | ||
435 | /* | |
436 | * Where in the log does this transaction's commit start? [no locking] | |
437 | */ | |
9c28cbcc | 438 | unsigned int t_log_start; |
1da177e4 LT |
439 | |
440 | /* Number of buffers on the t_buffers list [j_list_lock] */ | |
441 | int t_nr_buffers; | |
442 | ||
443 | /* | |
444 | * Doubly-linked circular list of all buffers reserved but not yet | |
445 | * modified by this transaction [j_list_lock] | |
446 | */ | |
447 | struct journal_head *t_reserved_list; | |
448 | ||
449 | /* | |
450 | * Doubly-linked circular list of all buffers under writeout during | |
451 | * commit [j_list_lock] | |
452 | */ | |
453 | struct journal_head *t_locked_list; | |
454 | ||
455 | /* | |
456 | * Doubly-linked circular list of all metadata buffers owned by this | |
457 | * transaction [j_list_lock] | |
458 | */ | |
459 | struct journal_head *t_buffers; | |
460 | ||
461 | /* | |
462 | * Doubly-linked circular list of all data buffers still to be | |
463 | * flushed before this transaction can be committed [j_list_lock] | |
464 | */ | |
465 | struct journal_head *t_sync_datalist; | |
466 | ||
467 | /* | |
468 | * Doubly-linked circular list of all forget buffers (superseded | |
469 | * buffers which we can un-checkpoint once this transaction commits) | |
470 | * [j_list_lock] | |
471 | */ | |
472 | struct journal_head *t_forget; | |
473 | ||
474 | /* | |
475 | * Doubly-linked circular list of all buffers still to be flushed before | |
476 | * this transaction can be checkpointed. [j_list_lock] | |
477 | */ | |
478 | struct journal_head *t_checkpoint_list; | |
479 | ||
78ce89c9 JK |
480 | /* |
481 | * Doubly-linked circular list of all buffers submitted for IO while | |
482 | * checkpointing. [j_list_lock] | |
483 | */ | |
484 | struct journal_head *t_checkpoint_io_list; | |
485 | ||
1da177e4 LT |
486 | /* |
487 | * Doubly-linked circular list of temporary buffers currently undergoing | |
488 | * IO in the log [j_list_lock] | |
489 | */ | |
490 | struct journal_head *t_iobuf_list; | |
491 | ||
492 | /* | |
493 | * Doubly-linked circular list of metadata buffers being shadowed by log | |
494 | * IO. The IO buffers on the iobuf list and the shadow buffers on this | |
495 | * list match each other one for one at all times. [j_list_lock] | |
496 | */ | |
497 | struct journal_head *t_shadow_list; | |
498 | ||
499 | /* | |
500 | * Doubly-linked circular list of control buffers being written to the | |
501 | * log. [j_list_lock] | |
502 | */ | |
503 | struct journal_head *t_log_list; | |
504 | ||
505 | /* | |
506 | * Protects info related to handles | |
507 | */ | |
508 | spinlock_t t_handle_lock; | |
509 | ||
510 | /* | |
511 | * Number of outstanding updates running on this transaction | |
512 | * [t_handle_lock] | |
513 | */ | |
514 | int t_updates; | |
515 | ||
516 | /* | |
517 | * Number of buffers reserved for use by all handles in this transaction | |
518 | * handle but not yet modified. [t_handle_lock] | |
519 | */ | |
520 | int t_outstanding_credits; | |
521 | ||
522 | /* | |
523 | * Forward and backward links for the circular list of all transactions | |
524 | * awaiting checkpoint. [j_list_lock] | |
525 | */ | |
526 | transaction_t *t_cpnext, *t_cpprev; | |
527 | ||
528 | /* | |
529 | * When will the transaction expire (become due for commit), in jiffies? | |
530 | * [no locking] | |
531 | */ | |
532 | unsigned long t_expires; | |
533 | ||
f420d4dc JB |
534 | /* |
535 | * When this transaction started, in nanoseconds [no locking] | |
536 | */ | |
537 | ktime_t t_start_time; | |
538 | ||
1da177e4 LT |
539 | /* |
540 | * How many handles used this transaction? [t_handle_lock] | |
541 | */ | |
542 | int t_handle_count; | |
543 | ||
512a0043 TT |
544 | /* |
545 | * This transaction is being forced and some process is | |
546 | * waiting for it to finish. | |
547 | */ | |
4fefce9a | 548 | unsigned int t_synchronous_commit:1; |
1da177e4 LT |
549 | }; |
550 | ||
551 | /** | |
a6b91919 | 552 | * struct journal_s - this is the concrete type associated with journal_t. |
1da177e4 LT |
553 | * @j_flags: General journaling state flags |
554 | * @j_errno: Is there an outstanding uncleared error on the journal (from a | |
ae6ddcc5 | 555 | * prior abort)? |
1da177e4 LT |
556 | * @j_sb_buffer: First part of superblock buffer |
557 | * @j_superblock: Second part of superblock buffer | |
558 | * @j_format_version: Version of the superblock format | |
559 | * @j_state_lock: Protect the various scalars in the journal | |
560 | * @j_barrier_count: Number of processes waiting to create a barrier lock | |
561 | * @j_barrier: The barrier lock itself | |
562 | * @j_running_transaction: The current running transaction.. | |
563 | * @j_committing_transaction: the transaction we are pushing to disk | |
564 | * @j_checkpoint_transactions: a linked circular list of all transactions | |
565 | * waiting for checkpointing | |
566 | * @j_wait_transaction_locked: Wait queue for waiting for a locked transaction | |
567 | * to start committing, or for a barrier lock to be released | |
568 | * @j_wait_logspace: Wait queue for waiting for checkpointing to complete | |
ae6ddcc5 | 569 | * @j_wait_done_commit: Wait queue for waiting for commit to complete |
1da177e4 LT |
570 | * @j_wait_checkpoint: Wait queue to trigger checkpointing |
571 | * @j_wait_commit: Wait queue to trigger commit | |
572 | * @j_wait_updates: Wait queue to wait for updates to complete | |
2c68ee75 | 573 | * @j_checkpoint_mutex: Mutex for locking against concurrent checkpoints |
1da177e4 LT |
574 | * @j_head: Journal head - identifies the first unused block in the journal |
575 | * @j_tail: Journal tail - identifies the oldest still-used block in the | |
576 | * journal. | |
577 | * @j_free: Journal free - how many free blocks are there in the journal? | |
ae6ddcc5 | 578 | * @j_first: The block number of the first usable block |
1da177e4 LT |
579 | * @j_last: The block number one beyond the last usable block |
580 | * @j_dev: Device where we store the journal | |
581 | * @j_blocksize: blocksize for the location where we store the journal. | |
582 | * @j_blk_offset: starting block offset for into the device where we store the | |
583 | * journal | |
584 | * @j_fs_dev: Device which holds the client fs. For internal journal this will | |
585 | * be equal to j_dev | |
586 | * @j_maxlen: Total maximum capacity of the journal region on disk. | |
587 | * @j_list_lock: Protects the buffer lists and internal buffer state. | |
588 | * @j_inode: Optional inode where we store the journal. If present, all journal | |
589 | * block numbers are mapped into this inode via bmap(). | |
ae6ddcc5 | 590 | * @j_tail_sequence: Sequence number of the oldest transaction in the log |
1da177e4 LT |
591 | * @j_transaction_sequence: Sequence number of the next transaction to grant |
592 | * @j_commit_sequence: Sequence number of the most recently committed | |
593 | * transaction | |
594 | * @j_commit_request: Sequence number of the most recent transaction wanting | |
ae6ddcc5 | 595 | * commit |
1da177e4 LT |
596 | * @j_uuid: Uuid of client object. |
597 | * @j_task: Pointer to the current commit thread for this journal | |
598 | * @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a | |
599 | * single compound commit transaction | |
600 | * @j_commit_interval: What is the maximum transaction lifetime before we begin | |
601 | * a commit? | |
602 | * @j_commit_timer: The timer used to wakeup the commit thread | |
603 | * @j_revoke_lock: Protect the revoke table | |
604 | * @j_revoke: The revoke table - maintains the list of revoked blocks in the | |
605 | * current transaction. | |
606 | * @j_revoke_table: alternate revoke tables for j_revoke | |
6c8bec6d RD |
607 | * @j_wbuf: array of buffer_heads for journal_commit_transaction |
608 | * @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the | |
609 | * number that will fit in j_blocksize | |
fe1dcbc4 | 610 | * @j_last_sync_writer: most recent pid which did a synchronous write |
3eabdb76 RD |
611 | * @j_average_commit_time: the average amount of time in nanoseconds it |
612 | * takes to commit a transaction to the disk. | |
1da177e4 LT |
613 | * @j_private: An opaque pointer to fs-private information. |
614 | */ | |
615 | ||
616 | struct journal_s | |
617 | { | |
618 | /* General journaling state flags [j_state_lock] */ | |
619 | unsigned long j_flags; | |
620 | ||
621 | /* | |
622 | * Is there an outstanding uncleared error on the journal (from a prior | |
623 | * abort)? [j_state_lock] | |
624 | */ | |
625 | int j_errno; | |
626 | ||
627 | /* The superblock buffer */ | |
628 | struct buffer_head *j_sb_buffer; | |
629 | journal_superblock_t *j_superblock; | |
630 | ||
631 | /* Version of the superblock format */ | |
632 | int j_format_version; | |
633 | ||
634 | /* | |
635 | * Protect the various scalars in the journal | |
636 | */ | |
637 | spinlock_t j_state_lock; | |
638 | ||
639 | /* | |
640 | * Number of processes waiting to create a barrier lock [j_state_lock] | |
641 | */ | |
642 | int j_barrier_count; | |
643 | ||
644 | /* The barrier lock itself */ | |
2c68ee75 | 645 | struct mutex j_barrier; |
1da177e4 LT |
646 | |
647 | /* | |
648 | * Transactions: The current running transaction... | |
649 | * [j_state_lock] [caller holding open handle] | |
650 | */ | |
651 | transaction_t *j_running_transaction; | |
652 | ||
653 | /* | |
654 | * the transaction we are pushing to disk | |
655 | * [j_state_lock] [caller holding open handle] | |
656 | */ | |
657 | transaction_t *j_committing_transaction; | |
658 | ||
659 | /* | |
660 | * ... and a linked circular list of all transactions waiting for | |
661 | * checkpointing. [j_list_lock] | |
662 | */ | |
663 | transaction_t *j_checkpoint_transactions; | |
664 | ||
665 | /* | |
666 | * Wait queue for waiting for a locked transaction to start committing, | |
667 | * or for a barrier lock to be released | |
668 | */ | |
669 | wait_queue_head_t j_wait_transaction_locked; | |
670 | ||
671 | /* Wait queue for waiting for checkpointing to complete */ | |
672 | wait_queue_head_t j_wait_logspace; | |
673 | ||
674 | /* Wait queue for waiting for commit to complete */ | |
675 | wait_queue_head_t j_wait_done_commit; | |
676 | ||
677 | /* Wait queue to trigger checkpointing */ | |
678 | wait_queue_head_t j_wait_checkpoint; | |
679 | ||
680 | /* Wait queue to trigger commit */ | |
681 | wait_queue_head_t j_wait_commit; | |
682 | ||
683 | /* Wait queue to wait for updates to complete */ | |
684 | wait_queue_head_t j_wait_updates; | |
685 | ||
686 | /* Semaphore for locking against concurrent checkpoints */ | |
e9ad5620 | 687 | struct mutex j_checkpoint_mutex; |
1da177e4 LT |
688 | |
689 | /* | |
690 | * Journal head: identifies the first unused block in the journal. | |
691 | * [j_state_lock] | |
692 | */ | |
9c28cbcc | 693 | unsigned int j_head; |
1da177e4 LT |
694 | |
695 | /* | |
696 | * Journal tail: identifies the oldest still-used block in the journal. | |
697 | * [j_state_lock] | |
698 | */ | |
9c28cbcc | 699 | unsigned int j_tail; |
1da177e4 LT |
700 | |
701 | /* | |
702 | * Journal free: how many free blocks are there in the journal? | |
703 | * [j_state_lock] | |
704 | */ | |
9c28cbcc | 705 | unsigned int j_free; |
1da177e4 LT |
706 | |
707 | /* | |
708 | * Journal start and end: the block numbers of the first usable block | |
709 | * and one beyond the last usable block in the journal. [j_state_lock] | |
710 | */ | |
9c28cbcc JK |
711 | unsigned int j_first; |
712 | unsigned int j_last; | |
1da177e4 LT |
713 | |
714 | /* | |
715 | * Device, blocksize and starting block offset for the location where we | |
716 | * store the journal. | |
717 | */ | |
718 | struct block_device *j_dev; | |
719 | int j_blocksize; | |
9c28cbcc | 720 | unsigned int j_blk_offset; |
1da177e4 LT |
721 | |
722 | /* | |
723 | * Device which holds the client fs. For internal journal this will be | |
724 | * equal to j_dev. | |
725 | */ | |
726 | struct block_device *j_fs_dev; | |
727 | ||
728 | /* Total maximum capacity of the journal region on disk. */ | |
729 | unsigned int j_maxlen; | |
730 | ||
731 | /* | |
732 | * Protects the buffer lists and internal buffer state. | |
733 | */ | |
734 | spinlock_t j_list_lock; | |
735 | ||
736 | /* Optional inode where we store the journal. If present, all */ | |
737 | /* journal block numbers are mapped into this inode via */ | |
738 | /* bmap(). */ | |
739 | struct inode *j_inode; | |
740 | ||
741 | /* | |
742 | * Sequence number of the oldest transaction in the log [j_state_lock] | |
743 | */ | |
744 | tid_t j_tail_sequence; | |
745 | ||
746 | /* | |
747 | * Sequence number of the next transaction to grant [j_state_lock] | |
748 | */ | |
749 | tid_t j_transaction_sequence; | |
750 | ||
751 | /* | |
752 | * Sequence number of the most recently committed transaction | |
753 | * [j_state_lock]. | |
754 | */ | |
755 | tid_t j_commit_sequence; | |
756 | ||
757 | /* | |
758 | * Sequence number of the most recent transaction wanting commit | |
759 | * [j_state_lock] | |
760 | */ | |
761 | tid_t j_commit_request; | |
762 | ||
763 | /* | |
764 | * Journal uuid: identifies the object (filesystem, LVM volume etc) | |
765 | * backed by this journal. This will eventually be replaced by an array | |
766 | * of uuids, allowing us to index multiple devices within a single | |
767 | * journal and to perform atomic updates across them. | |
768 | */ | |
769 | __u8 j_uuid[16]; | |
770 | ||
771 | /* Pointer to the current commit thread for this journal */ | |
772 | struct task_struct *j_task; | |
773 | ||
774 | /* | |
775 | * Maximum number of metadata buffers to allow in a single compound | |
776 | * commit transaction | |
777 | */ | |
778 | int j_max_transaction_buffers; | |
779 | ||
780 | /* | |
781 | * What is the maximum transaction lifetime before we begin a commit? | |
782 | */ | |
783 | unsigned long j_commit_interval; | |
784 | ||
785 | /* The timer used to wakeup the commit thread: */ | |
e3df1898 | 786 | struct timer_list j_commit_timer; |
1da177e4 LT |
787 | |
788 | /* | |
789 | * The revoke table: maintains the list of revoked blocks in the | |
790 | * current transaction. [j_revoke_lock] | |
791 | */ | |
792 | spinlock_t j_revoke_lock; | |
793 | struct jbd_revoke_table_s *j_revoke; | |
794 | struct jbd_revoke_table_s *j_revoke_table[2]; | |
795 | ||
796 | /* | |
797 | * array of bhs for journal_commit_transaction | |
798 | */ | |
799 | struct buffer_head **j_wbuf; | |
800 | int j_wbufsize; | |
801 | ||
f420d4dc JB |
802 | /* |
803 | * this is the pid of the last person to run a synchronous operation | |
804 | * through the journal. | |
805 | */ | |
fe1dcbc4 AM |
806 | pid_t j_last_sync_writer; |
807 | ||
f420d4dc JB |
808 | /* |
809 | * the average amount of time in nanoseconds it takes to commit a | |
810 | * transaction to the disk. [j_state_lock] | |
811 | */ | |
812 | u64 j_average_commit_time; | |
813 | ||
1da177e4 LT |
814 | /* |
815 | * An opaque pointer to fs-private information. ext3 puts its | |
816 | * superblock pointer here | |
817 | */ | |
818 | void *j_private; | |
819 | }; | |
820 | ||
ae6ddcc5 MC |
821 | /* |
822 | * Journal flag definitions | |
1da177e4 LT |
823 | */ |
824 | #define JFS_UNMOUNT 0x001 /* Journal thread is being destroyed */ | |
825 | #define JFS_ABORT 0x002 /* Journaling has been aborted for errors. */ | |
826 | #define JFS_ACK_ERR 0x004 /* The errno in the sb has been acked */ | |
827 | #define JFS_FLUSHED 0x008 /* The journal superblock has been flushed */ | |
828 | #define JFS_LOADED 0x010 /* The journal superblock has been loaded */ | |
829 | #define JFS_BARRIER 0x020 /* Use IDE barriers */ | |
0e4fb5e2 HK |
830 | #define JFS_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file |
831 | * data write error in ordered | |
832 | * mode */ | |
1da177e4 | 833 | |
ae6ddcc5 | 834 | /* |
1da177e4 LT |
835 | * Function declarations for the journaling transaction and buffer |
836 | * management | |
837 | */ | |
838 | ||
839 | /* Filing buffers */ | |
1da177e4 LT |
840 | extern void journal_unfile_buffer(journal_t *, struct journal_head *); |
841 | extern void __journal_unfile_buffer(struct journal_head *); | |
842 | extern void __journal_refile_buffer(struct journal_head *); | |
843 | extern void journal_refile_buffer(journal_t *, struct journal_head *); | |
844 | extern void __journal_file_buffer(struct journal_head *, transaction_t *, int); | |
845 | extern void __journal_free_buffer(struct journal_head *bh); | |
846 | extern void journal_file_buffer(struct journal_head *, transaction_t *, int); | |
847 | extern void __journal_clean_data_list(transaction_t *transaction); | |
848 | ||
849 | /* Log buffer allocation */ | |
850 | extern struct journal_head * journal_get_descriptor_buffer(journal_t *); | |
9c28cbcc | 851 | int journal_next_log_block(journal_t *, unsigned int *); |
1da177e4 LT |
852 | |
853 | /* Commit management */ | |
854 | extern void journal_commit_transaction(journal_t *); | |
855 | ||
856 | /* Checkpoint list management */ | |
857 | int __journal_clean_checkpoint_list(journal_t *journal); | |
78ce89c9 | 858 | int __journal_remove_checkpoint(struct journal_head *); |
1da177e4 LT |
859 | void __journal_insert_checkpoint(struct journal_head *, transaction_t *); |
860 | ||
861 | /* Buffer IO */ | |
ae6ddcc5 | 862 | extern int |
1da177e4 LT |
863 | journal_write_metadata_buffer(transaction_t *transaction, |
864 | struct journal_head *jh_in, | |
865 | struct journal_head **jh_out, | |
9c28cbcc | 866 | unsigned int blocknr); |
1da177e4 LT |
867 | |
868 | /* Transaction locking */ | |
869 | extern void __wait_on_journal (journal_t *); | |
870 | ||
871 | /* | |
872 | * Journal locking. | |
873 | * | |
874 | * We need to lock the journal during transaction state changes so that nobody | |
875 | * ever tries to take a handle on the running transaction while we are in the | |
876 | * middle of moving it to the commit phase. j_state_lock does this. | |
877 | * | |
878 | * Note that the locking is completely interrupt unsafe. We never touch | |
879 | * journal structures from interrupts. | |
880 | */ | |
881 | ||
882 | static inline handle_t *journal_current_handle(void) | |
883 | { | |
884 | return current->journal_info; | |
885 | } | |
886 | ||
887 | /* The journaling code user interface: | |
888 | * | |
889 | * Create and destroy handles | |
ae6ddcc5 | 890 | * Register buffer modifications against the current transaction. |
1da177e4 LT |
891 | */ |
892 | ||
893 | extern handle_t *journal_start(journal_t *, int nblocks); | |
894 | extern int journal_restart (handle_t *, int nblocks); | |
895 | extern int journal_extend (handle_t *, int nblocks); | |
896 | extern int journal_get_write_access(handle_t *, struct buffer_head *); | |
897 | extern int journal_get_create_access (handle_t *, struct buffer_head *); | |
898 | extern int journal_get_undo_access(handle_t *, struct buffer_head *); | |
899 | extern int journal_dirty_data (handle_t *, struct buffer_head *); | |
900 | extern int journal_dirty_metadata (handle_t *, struct buffer_head *); | |
901 | extern void journal_release_buffer (handle_t *, struct buffer_head *); | |
902 | extern int journal_forget (handle_t *, struct buffer_head *); | |
903 | extern void journal_sync_buffer (struct buffer_head *); | |
2ff28e22 | 904 | extern void journal_invalidatepage(journal_t *, |
1da177e4 | 905 | struct page *, unsigned long); |
27496a8c | 906 | extern int journal_try_to_free_buffers(journal_t *, struct page *, gfp_t); |
1da177e4 LT |
907 | extern int journal_stop(handle_t *); |
908 | extern int journal_flush (journal_t *); | |
909 | extern void journal_lock_updates (journal_t *); | |
910 | extern void journal_unlock_updates (journal_t *); | |
911 | ||
912 | extern journal_t * journal_init_dev(struct block_device *bdev, | |
913 | struct block_device *fs_dev, | |
914 | int start, int len, int bsize); | |
915 | extern journal_t * journal_init_inode (struct inode *); | |
916 | extern int journal_update_format (journal_t *); | |
ae6ddcc5 | 917 | extern int journal_check_used_features |
1da177e4 | 918 | (journal_t *, unsigned long, unsigned long, unsigned long); |
ae6ddcc5 | 919 | extern int journal_check_available_features |
1da177e4 | 920 | (journal_t *, unsigned long, unsigned long, unsigned long); |
ae6ddcc5 | 921 | extern int journal_set_features |
1da177e4 LT |
922 | (journal_t *, unsigned long, unsigned long, unsigned long); |
923 | extern int journal_create (journal_t *); | |
924 | extern int journal_load (journal_t *journal); | |
4afe9785 | 925 | extern int journal_destroy (journal_t *); |
1da177e4 LT |
926 | extern int journal_recover (journal_t *journal); |
927 | extern int journal_wipe (journal_t *, int); | |
928 | extern int journal_skip_recovery (journal_t *); | |
929 | extern void journal_update_superblock (journal_t *, int); | |
1da177e4 LT |
930 | extern void journal_abort (journal_t *, int); |
931 | extern int journal_errno (journal_t *); | |
932 | extern void journal_ack_err (journal_t *); | |
933 | extern int journal_clear_err (journal_t *); | |
9c28cbcc | 934 | extern int journal_bmap(journal_t *, unsigned int, unsigned int *); |
1da177e4 LT |
935 | extern int journal_force_commit(journal_t *); |
936 | ||
937 | /* | |
938 | * journal_head management | |
939 | */ | |
940 | struct journal_head *journal_add_journal_head(struct buffer_head *bh); | |
941 | struct journal_head *journal_grab_journal_head(struct buffer_head *bh); | |
942 | void journal_remove_journal_head(struct buffer_head *bh); | |
943 | void journal_put_journal_head(struct journal_head *jh); | |
944 | ||
945 | /* | |
946 | * handle management | |
947 | */ | |
e18b890b | 948 | extern struct kmem_cache *jbd_handle_cache; |
1da177e4 | 949 | |
dd0fc66f | 950 | static inline handle_t *jbd_alloc_handle(gfp_t gfp_flags) |
1da177e4 LT |
951 | { |
952 | return kmem_cache_alloc(jbd_handle_cache, gfp_flags); | |
953 | } | |
954 | ||
955 | static inline void jbd_free_handle(handle_t *handle) | |
956 | { | |
957 | kmem_cache_free(jbd_handle_cache, handle); | |
958 | } | |
959 | ||
960 | /* Primary revoke support */ | |
961 | #define JOURNAL_REVOKE_DEFAULT_HASH 256 | |
962 | extern int journal_init_revoke(journal_t *, int); | |
963 | extern void journal_destroy_revoke_caches(void); | |
964 | extern int journal_init_revoke_caches(void); | |
965 | ||
966 | extern void journal_destroy_revoke(journal_t *); | |
967 | extern int journal_revoke (handle_t *, | |
9c28cbcc | 968 | unsigned int, struct buffer_head *); |
1da177e4 | 969 | extern int journal_cancel_revoke(handle_t *, struct journal_head *); |
38d726d1 TT |
970 | extern void journal_write_revoke_records(journal_t *, |
971 | transaction_t *, int); | |
1da177e4 LT |
972 | |
973 | /* Recovery revoke support */ | |
9c28cbcc JK |
974 | extern int journal_set_revoke(journal_t *, unsigned int, tid_t); |
975 | extern int journal_test_revoke(journal_t *, unsigned int, tid_t); | |
1da177e4 | 976 | extern void journal_clear_revoke(journal_t *); |
1da177e4 LT |
977 | extern void journal_switch_revoke_table(journal_t *journal); |
978 | ||
979 | /* | |
980 | * The log thread user interface: | |
981 | * | |
982 | * Request space in the current transaction, and force transaction commit | |
983 | * transitions on demand. | |
984 | */ | |
985 | ||
986 | int __log_space_left(journal_t *); /* Called with journal locked */ | |
987 | int log_start_commit(journal_t *journal, tid_t tid); | |
988 | int __log_start_commit(journal_t *journal, tid_t tid); | |
989 | int journal_start_commit(journal_t *journal, tid_t *tid); | |
990 | int journal_force_commit_nested(journal_t *journal); | |
991 | int log_wait_commit(journal_t *journal, tid_t tid); | |
992 | int log_do_checkpoint(journal_t *journal); | |
993 | ||
994 | void __log_wait_for_space(journal_t *journal); | |
995 | extern void __journal_drop_transaction(journal_t *, transaction_t *); | |
996 | extern int cleanup_journal_tail(journal_t *); | |
997 | ||
998 | /* Debugging code only: */ | |
999 | ||
1000 | #define jbd_ENOSYS() \ | |
1001 | do { \ | |
d5c003b4 | 1002 | printk (KERN_ERR "JBD unimplemented function %s\n", __func__); \ |
1da177e4 LT |
1003 | current->state = TASK_UNINTERRUPTIBLE; \ |
1004 | schedule(); \ | |
1005 | } while (1) | |
1006 | ||
1007 | /* | |
1008 | * is_journal_abort | |
1009 | * | |
1010 | * Simple test wrapper function to test the JFS_ABORT state flag. This | |
1011 | * bit, when set, indicates that we have had a fatal error somewhere, | |
1012 | * either inside the journaling layer or indicated to us by the client | |
1013 | * (eg. ext3), and that we and should not commit any further | |
ae6ddcc5 | 1014 | * transactions. |
1da177e4 LT |
1015 | */ |
1016 | ||
1017 | static inline int is_journal_aborted(journal_t *journal) | |
1018 | { | |
1019 | return journal->j_flags & JFS_ABORT; | |
1020 | } | |
1021 | ||
1022 | static inline int is_handle_aborted(handle_t *handle) | |
1023 | { | |
1024 | if (handle->h_aborted) | |
1025 | return 1; | |
1026 | return is_journal_aborted(handle->h_transaction->t_journal); | |
1027 | } | |
1028 | ||
1029 | static inline void journal_abort_handle(handle_t *handle) | |
1030 | { | |
1031 | handle->h_aborted = 1; | |
1032 | } | |
1033 | ||
1034 | #endif /* __KERNEL__ */ | |
1035 | ||
1036 | /* Comparison functions for transaction IDs: perform comparisons using | |
1037 | * modulo arithmetic so that they work over sequence number wraps. */ | |
1038 | ||
1039 | static inline int tid_gt(tid_t x, tid_t y) | |
1040 | { | |
1041 | int difference = (x - y); | |
1042 | return (difference > 0); | |
1043 | } | |
1044 | ||
1045 | static inline int tid_geq(tid_t x, tid_t y) | |
1046 | { | |
1047 | int difference = (x - y); | |
1048 | return (difference >= 0); | |
1049 | } | |
1050 | ||
1051 | extern int journal_blocks_per_page(struct inode *inode); | |
1052 | ||
1053 | /* | |
1054 | * Return the minimum number of blocks which must be free in the journal | |
1055 | * before a new transaction may be started. Must be called under j_state_lock. | |
1056 | */ | |
1057 | static inline int jbd_space_needed(journal_t *journal) | |
1058 | { | |
1059 | int nblocks = journal->j_max_transaction_buffers; | |
1060 | if (journal->j_committing_transaction) | |
1061 | nblocks += journal->j_committing_transaction-> | |
1062 | t_outstanding_credits; | |
1063 | return nblocks; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * Definitions which augment the buffer_head layer | |
1068 | */ | |
1069 | ||
1070 | /* journaling buffer types */ | |
1071 | #define BJ_None 0 /* Not journaled */ | |
1072 | #define BJ_SyncData 1 /* Normal data: flush before commit */ | |
1073 | #define BJ_Metadata 2 /* Normal journaled metadata */ | |
1074 | #define BJ_Forget 3 /* Buffer superseded by this transaction */ | |
1075 | #define BJ_IO 4 /* Buffer is for temporary IO use */ | |
1076 | #define BJ_Shadow 5 /* Buffer contents being shadowed to the log */ | |
1077 | #define BJ_LogCtl 6 /* Buffer contains log descriptors */ | |
1078 | #define BJ_Reserved 7 /* Buffer is reserved for access by journal */ | |
1079 | #define BJ_Locked 8 /* Locked for I/O during commit */ | |
1080 | #define BJ_Types 9 | |
ae6ddcc5 | 1081 | |
1da177e4 LT |
1082 | extern int jbd_blocks_per_page(struct inode *inode); |
1083 | ||
1084 | #ifdef __KERNEL__ | |
1085 | ||
1086 | #define buffer_trace_init(bh) do {} while (0) | |
1087 | #define print_buffer_fields(bh) do {} while (0) | |
1088 | #define print_buffer_trace(bh) do {} while (0) | |
1089 | #define BUFFER_TRACE(bh, info) do {} while (0) | |
1090 | #define BUFFER_TRACE2(bh, bh2, info) do {} while (0) | |
1091 | #define JBUFFER_TRACE(jh, info) do {} while (0) | |
1092 | ||
1093 | #endif /* __KERNEL__ */ | |
1094 | ||
1da177e4 | 1095 | #endif /* _LINUX_JBD_H */ |