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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 | /* | |
38 | * Define JBD_PARANIOD_IOFAIL to cause a kernel BUG() if ext3 finds | |
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 LT |
248 | |
249 | #if defined(CONFIG_BUFFER_DEBUG) | |
250 | void buffer_assertion_failure(struct buffer_head *bh); | |
251 | #define J_ASSERT_BH(bh, expr) \ | |
252 | do { \ | |
253 | if (!(expr)) \ | |
254 | buffer_assertion_failure(bh); \ | |
255 | J_ASSERT(expr); \ | |
256 | } while (0) | |
257 | #define J_ASSERT_JH(jh, expr) J_ASSERT_BH(jh2bh(jh), expr) | |
258 | #else | |
259 | #define J_ASSERT_BH(bh, expr) J_ASSERT(expr) | |
260 | #define J_ASSERT_JH(jh, expr) J_ASSERT(expr) | |
261 | #endif | |
262 | ||
1da177e4 LT |
263 | #if defined(JBD_PARANOID_IOFAIL) |
264 | #define J_EXPECT(expr, why...) J_ASSERT(expr) | |
265 | #define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr) | |
266 | #define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr) | |
267 | #else | |
268 | #define __journal_expect(expr, why...) \ | |
269 | ({ \ | |
270 | int val = (expr); \ | |
271 | if (!val) { \ | |
272 | printk(KERN_ERR \ | |
273 | "EXT3-fs unexpected failure: %s;\n",# expr); \ | |
274 | printk(KERN_ERR why "\n"); \ | |
275 | } \ | |
276 | val; \ | |
277 | }) | |
278 | #define J_EXPECT(expr, why...) __journal_expect(expr, ## why) | |
279 | #define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why) | |
280 | #define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why) | |
281 | #endif | |
282 | ||
283 | enum jbd_state_bits { | |
284 | BH_JBD /* Has an attached ext3 journal_head */ | |
285 | = BH_PrivateStart, | |
286 | BH_JWrite, /* Being written to log (@@@ DEBUGGING) */ | |
287 | BH_Freed, /* Has been freed (truncated) */ | |
288 | BH_Revoked, /* Has been revoked from the log */ | |
289 | BH_RevokeValid, /* Revoked flag is valid */ | |
290 | BH_JBDDirty, /* Is dirty but journaled */ | |
291 | BH_State, /* Pins most journal_head state */ | |
292 | BH_JournalHead, /* Pins bh->b_private and jh->b_bh */ | |
293 | BH_Unshadow, /* Dummy bit, for BJ_Shadow wakeup filtering */ | |
294 | }; | |
295 | ||
296 | BUFFER_FNS(JBD, jbd) | |
297 | BUFFER_FNS(JWrite, jwrite) | |
298 | BUFFER_FNS(JBDDirty, jbddirty) | |
299 | TAS_BUFFER_FNS(JBDDirty, jbddirty) | |
300 | BUFFER_FNS(Revoked, revoked) | |
301 | TAS_BUFFER_FNS(Revoked, revoked) | |
302 | BUFFER_FNS(RevokeValid, revokevalid) | |
303 | TAS_BUFFER_FNS(RevokeValid, revokevalid) | |
304 | BUFFER_FNS(Freed, freed) | |
305 | ||
306 | static inline struct buffer_head *jh2bh(struct journal_head *jh) | |
307 | { | |
308 | return jh->b_bh; | |
309 | } | |
310 | ||
311 | static inline struct journal_head *bh2jh(struct buffer_head *bh) | |
312 | { | |
313 | return bh->b_private; | |
314 | } | |
315 | ||
316 | static inline void jbd_lock_bh_state(struct buffer_head *bh) | |
317 | { | |
318 | bit_spin_lock(BH_State, &bh->b_state); | |
319 | } | |
320 | ||
321 | static inline int jbd_trylock_bh_state(struct buffer_head *bh) | |
322 | { | |
323 | return bit_spin_trylock(BH_State, &bh->b_state); | |
324 | } | |
325 | ||
326 | static inline int jbd_is_locked_bh_state(struct buffer_head *bh) | |
327 | { | |
328 | return bit_spin_is_locked(BH_State, &bh->b_state); | |
329 | } | |
330 | ||
331 | static inline void jbd_unlock_bh_state(struct buffer_head *bh) | |
332 | { | |
333 | bit_spin_unlock(BH_State, &bh->b_state); | |
334 | } | |
335 | ||
336 | static inline void jbd_lock_bh_journal_head(struct buffer_head *bh) | |
337 | { | |
338 | bit_spin_lock(BH_JournalHead, &bh->b_state); | |
339 | } | |
340 | ||
341 | static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh) | |
342 | { | |
343 | bit_spin_unlock(BH_JournalHead, &bh->b_state); | |
344 | } | |
345 | ||
346 | struct jbd_revoke_table_s; | |
347 | ||
348 | /** | |
a6b91919 | 349 | * struct handle_s - this is the concrete type associated with handle_t. |
1da177e4 LT |
350 | * @h_transaction: Which compound transaction is this update a part of? |
351 | * @h_buffer_credits: Number of remaining buffers we are allowed to dirty. | |
352 | * @h_ref: Reference count on this handle | |
353 | * @h_err: Field for caller's use to track errors through large fs operations | |
354 | * @h_sync: flag for sync-on-close | |
355 | * @h_jdata: flag to force data journaling | |
356 | * @h_aborted: flag indicating fatal error on handle | |
e6716b87 | 357 | * @h_lockdep_map: lockdep info for debugging lock problems |
1da177e4 | 358 | */ |
ae6ddcc5 | 359 | struct handle_s |
1da177e4 LT |
360 | { |
361 | /* Which compound transaction is this update a part of? */ | |
362 | transaction_t *h_transaction; | |
363 | ||
364 | /* Number of remaining buffers we are allowed to dirty: */ | |
365 | int h_buffer_credits; | |
366 | ||
367 | /* Reference count on this handle */ | |
368 | int h_ref; | |
369 | ||
370 | /* Field for caller's use to track errors through large fs */ | |
371 | /* operations */ | |
372 | int h_err; | |
373 | ||
374 | /* Flags [no locking] */ | |
375 | unsigned int h_sync: 1; /* sync-on-close */ | |
376 | unsigned int h_jdata: 1; /* force data journaling */ | |
377 | unsigned int h_aborted: 1; /* fatal error on handle */ | |
34a3d1e8 PZ |
378 | |
379 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
380 | struct lockdep_map h_lockdep_map; | |
381 | #endif | |
1da177e4 LT |
382 | }; |
383 | ||
384 | ||
385 | /* The transaction_t type is the guts of the journaling mechanism. It | |
386 | * tracks a compound transaction through its various states: | |
387 | * | |
388 | * RUNNING: accepting new updates | |
389 | * LOCKED: Updates still running but we don't accept new ones | |
390 | * RUNDOWN: Updates are tidying up but have finished requesting | |
391 | * new buffers to modify (state not used for now) | |
392 | * FLUSH: All updates complete, but we are still writing to disk | |
393 | * COMMIT: All data on disk, writing commit record | |
394 | * FINISHED: We still have to keep the transaction for checkpointing. | |
395 | * | |
396 | * The transaction keeps track of all of the buffers modified by a | |
397 | * running transaction, and all of the buffers committed but not yet | |
398 | * flushed to home for finished transactions. | |
399 | */ | |
400 | ||
401 | /* | |
402 | * Lock ranking: | |
403 | * | |
404 | * j_list_lock | |
405 | * ->jbd_lock_bh_journal_head() (This is "innermost") | |
406 | * | |
407 | * j_state_lock | |
408 | * ->jbd_lock_bh_state() | |
409 | * | |
410 | * jbd_lock_bh_state() | |
411 | * ->j_list_lock | |
412 | * | |
413 | * j_state_lock | |
414 | * ->t_handle_lock | |
415 | * | |
416 | * j_state_lock | |
417 | * ->j_list_lock (journal_unmap_buffer) | |
418 | * | |
419 | */ | |
420 | ||
ae6ddcc5 | 421 | struct transaction_s |
1da177e4 LT |
422 | { |
423 | /* Pointer to the journal for this transaction. [no locking] */ | |
424 | journal_t *t_journal; | |
425 | ||
426 | /* Sequence number for this transaction [no locking] */ | |
427 | tid_t t_tid; | |
428 | ||
429 | /* | |
430 | * Transaction's current state | |
431 | * [no locking - only kjournald alters this] | |
d4beaf4a JK |
432 | * [j_list_lock] guards transition of a transaction into T_FINISHED |
433 | * state and subsequent call of __journal_drop_transaction() | |
1da177e4 LT |
434 | * FIXME: needs barriers |
435 | * KLUDGE: [use j_state_lock] | |
436 | */ | |
437 | enum { | |
438 | T_RUNNING, | |
439 | T_LOCKED, | |
440 | T_RUNDOWN, | |
441 | T_FLUSH, | |
442 | T_COMMIT, | |
ae6ddcc5 | 443 | T_FINISHED |
1da177e4 LT |
444 | } t_state; |
445 | ||
446 | /* | |
447 | * Where in the log does this transaction's commit start? [no locking] | |
448 | */ | |
449 | unsigned long t_log_start; | |
450 | ||
451 | /* Number of buffers on the t_buffers list [j_list_lock] */ | |
452 | int t_nr_buffers; | |
453 | ||
454 | /* | |
455 | * Doubly-linked circular list of all buffers reserved but not yet | |
456 | * modified by this transaction [j_list_lock] | |
457 | */ | |
458 | struct journal_head *t_reserved_list; | |
459 | ||
460 | /* | |
461 | * Doubly-linked circular list of all buffers under writeout during | |
462 | * commit [j_list_lock] | |
463 | */ | |
464 | struct journal_head *t_locked_list; | |
465 | ||
466 | /* | |
467 | * Doubly-linked circular list of all metadata buffers owned by this | |
468 | * transaction [j_list_lock] | |
469 | */ | |
470 | struct journal_head *t_buffers; | |
471 | ||
472 | /* | |
473 | * Doubly-linked circular list of all data buffers still to be | |
474 | * flushed before this transaction can be committed [j_list_lock] | |
475 | */ | |
476 | struct journal_head *t_sync_datalist; | |
477 | ||
478 | /* | |
479 | * Doubly-linked circular list of all forget buffers (superseded | |
480 | * buffers which we can un-checkpoint once this transaction commits) | |
481 | * [j_list_lock] | |
482 | */ | |
483 | struct journal_head *t_forget; | |
484 | ||
485 | /* | |
486 | * Doubly-linked circular list of all buffers still to be flushed before | |
487 | * this transaction can be checkpointed. [j_list_lock] | |
488 | */ | |
489 | struct journal_head *t_checkpoint_list; | |
490 | ||
78ce89c9 JK |
491 | /* |
492 | * Doubly-linked circular list of all buffers submitted for IO while | |
493 | * checkpointing. [j_list_lock] | |
494 | */ | |
495 | struct journal_head *t_checkpoint_io_list; | |
496 | ||
1da177e4 LT |
497 | /* |
498 | * Doubly-linked circular list of temporary buffers currently undergoing | |
499 | * IO in the log [j_list_lock] | |
500 | */ | |
501 | struct journal_head *t_iobuf_list; | |
502 | ||
503 | /* | |
504 | * Doubly-linked circular list of metadata buffers being shadowed by log | |
505 | * IO. The IO buffers on the iobuf list and the shadow buffers on this | |
506 | * list match each other one for one at all times. [j_list_lock] | |
507 | */ | |
508 | struct journal_head *t_shadow_list; | |
509 | ||
510 | /* | |
511 | * Doubly-linked circular list of control buffers being written to the | |
512 | * log. [j_list_lock] | |
513 | */ | |
514 | struct journal_head *t_log_list; | |
515 | ||
516 | /* | |
517 | * Protects info related to handles | |
518 | */ | |
519 | spinlock_t t_handle_lock; | |
520 | ||
521 | /* | |
522 | * Number of outstanding updates running on this transaction | |
523 | * [t_handle_lock] | |
524 | */ | |
525 | int t_updates; | |
526 | ||
527 | /* | |
528 | * Number of buffers reserved for use by all handles in this transaction | |
529 | * handle but not yet modified. [t_handle_lock] | |
530 | */ | |
531 | int t_outstanding_credits; | |
532 | ||
533 | /* | |
534 | * Forward and backward links for the circular list of all transactions | |
535 | * awaiting checkpoint. [j_list_lock] | |
536 | */ | |
537 | transaction_t *t_cpnext, *t_cpprev; | |
538 | ||
539 | /* | |
540 | * When will the transaction expire (become due for commit), in jiffies? | |
541 | * [no locking] | |
542 | */ | |
543 | unsigned long t_expires; | |
544 | ||
f420d4dc JB |
545 | /* |
546 | * When this transaction started, in nanoseconds [no locking] | |
547 | */ | |
548 | ktime_t t_start_time; | |
549 | ||
1da177e4 LT |
550 | /* |
551 | * How many handles used this transaction? [t_handle_lock] | |
552 | */ | |
553 | int t_handle_count; | |
554 | ||
555 | }; | |
556 | ||
557 | /** | |
a6b91919 | 558 | * struct journal_s - this is the concrete type associated with journal_t. |
1da177e4 LT |
559 | * @j_flags: General journaling state flags |
560 | * @j_errno: Is there an outstanding uncleared error on the journal (from a | |
ae6ddcc5 | 561 | * prior abort)? |
1da177e4 LT |
562 | * @j_sb_buffer: First part of superblock buffer |
563 | * @j_superblock: Second part of superblock buffer | |
564 | * @j_format_version: Version of the superblock format | |
565 | * @j_state_lock: Protect the various scalars in the journal | |
566 | * @j_barrier_count: Number of processes waiting to create a barrier lock | |
567 | * @j_barrier: The barrier lock itself | |
568 | * @j_running_transaction: The current running transaction.. | |
569 | * @j_committing_transaction: the transaction we are pushing to disk | |
570 | * @j_checkpoint_transactions: a linked circular list of all transactions | |
571 | * waiting for checkpointing | |
572 | * @j_wait_transaction_locked: Wait queue for waiting for a locked transaction | |
573 | * to start committing, or for a barrier lock to be released | |
574 | * @j_wait_logspace: Wait queue for waiting for checkpointing to complete | |
ae6ddcc5 | 575 | * @j_wait_done_commit: Wait queue for waiting for commit to complete |
1da177e4 LT |
576 | * @j_wait_checkpoint: Wait queue to trigger checkpointing |
577 | * @j_wait_commit: Wait queue to trigger commit | |
578 | * @j_wait_updates: Wait queue to wait for updates to complete | |
2c68ee75 | 579 | * @j_checkpoint_mutex: Mutex for locking against concurrent checkpoints |
1da177e4 LT |
580 | * @j_head: Journal head - identifies the first unused block in the journal |
581 | * @j_tail: Journal tail - identifies the oldest still-used block in the | |
582 | * journal. | |
583 | * @j_free: Journal free - how many free blocks are there in the journal? | |
ae6ddcc5 | 584 | * @j_first: The block number of the first usable block |
1da177e4 LT |
585 | * @j_last: The block number one beyond the last usable block |
586 | * @j_dev: Device where we store the journal | |
587 | * @j_blocksize: blocksize for the location where we store the journal. | |
588 | * @j_blk_offset: starting block offset for into the device where we store the | |
589 | * journal | |
590 | * @j_fs_dev: Device which holds the client fs. For internal journal this will | |
591 | * be equal to j_dev | |
592 | * @j_maxlen: Total maximum capacity of the journal region on disk. | |
593 | * @j_list_lock: Protects the buffer lists and internal buffer state. | |
594 | * @j_inode: Optional inode where we store the journal. If present, all journal | |
595 | * block numbers are mapped into this inode via bmap(). | |
ae6ddcc5 | 596 | * @j_tail_sequence: Sequence number of the oldest transaction in the log |
1da177e4 LT |
597 | * @j_transaction_sequence: Sequence number of the next transaction to grant |
598 | * @j_commit_sequence: Sequence number of the most recently committed | |
599 | * transaction | |
600 | * @j_commit_request: Sequence number of the most recent transaction wanting | |
ae6ddcc5 | 601 | * commit |
1da177e4 LT |
602 | * @j_uuid: Uuid of client object. |
603 | * @j_task: Pointer to the current commit thread for this journal | |
604 | * @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a | |
605 | * single compound commit transaction | |
606 | * @j_commit_interval: What is the maximum transaction lifetime before we begin | |
607 | * a commit? | |
608 | * @j_commit_timer: The timer used to wakeup the commit thread | |
609 | * @j_revoke_lock: Protect the revoke table | |
610 | * @j_revoke: The revoke table - maintains the list of revoked blocks in the | |
611 | * current transaction. | |
612 | * @j_revoke_table: alternate revoke tables for j_revoke | |
6c8bec6d RD |
613 | * @j_wbuf: array of buffer_heads for journal_commit_transaction |
614 | * @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the | |
615 | * number that will fit in j_blocksize | |
fe1dcbc4 | 616 | * @j_last_sync_writer: most recent pid which did a synchronous write |
3eabdb76 RD |
617 | * @j_average_commit_time: the average amount of time in nanoseconds it |
618 | * takes to commit a transaction to the disk. | |
1da177e4 LT |
619 | * @j_private: An opaque pointer to fs-private information. |
620 | */ | |
621 | ||
622 | struct journal_s | |
623 | { | |
624 | /* General journaling state flags [j_state_lock] */ | |
625 | unsigned long j_flags; | |
626 | ||
627 | /* | |
628 | * Is there an outstanding uncleared error on the journal (from a prior | |
629 | * abort)? [j_state_lock] | |
630 | */ | |
631 | int j_errno; | |
632 | ||
633 | /* The superblock buffer */ | |
634 | struct buffer_head *j_sb_buffer; | |
635 | journal_superblock_t *j_superblock; | |
636 | ||
637 | /* Version of the superblock format */ | |
638 | int j_format_version; | |
639 | ||
640 | /* | |
641 | * Protect the various scalars in the journal | |
642 | */ | |
643 | spinlock_t j_state_lock; | |
644 | ||
645 | /* | |
646 | * Number of processes waiting to create a barrier lock [j_state_lock] | |
647 | */ | |
648 | int j_barrier_count; | |
649 | ||
650 | /* The barrier lock itself */ | |
2c68ee75 | 651 | struct mutex j_barrier; |
1da177e4 LT |
652 | |
653 | /* | |
654 | * Transactions: The current running transaction... | |
655 | * [j_state_lock] [caller holding open handle] | |
656 | */ | |
657 | transaction_t *j_running_transaction; | |
658 | ||
659 | /* | |
660 | * the transaction we are pushing to disk | |
661 | * [j_state_lock] [caller holding open handle] | |
662 | */ | |
663 | transaction_t *j_committing_transaction; | |
664 | ||
665 | /* | |
666 | * ... and a linked circular list of all transactions waiting for | |
667 | * checkpointing. [j_list_lock] | |
668 | */ | |
669 | transaction_t *j_checkpoint_transactions; | |
670 | ||
671 | /* | |
672 | * Wait queue for waiting for a locked transaction to start committing, | |
673 | * or for a barrier lock to be released | |
674 | */ | |
675 | wait_queue_head_t j_wait_transaction_locked; | |
676 | ||
677 | /* Wait queue for waiting for checkpointing to complete */ | |
678 | wait_queue_head_t j_wait_logspace; | |
679 | ||
680 | /* Wait queue for waiting for commit to complete */ | |
681 | wait_queue_head_t j_wait_done_commit; | |
682 | ||
683 | /* Wait queue to trigger checkpointing */ | |
684 | wait_queue_head_t j_wait_checkpoint; | |
685 | ||
686 | /* Wait queue to trigger commit */ | |
687 | wait_queue_head_t j_wait_commit; | |
688 | ||
689 | /* Wait queue to wait for updates to complete */ | |
690 | wait_queue_head_t j_wait_updates; | |
691 | ||
692 | /* Semaphore for locking against concurrent checkpoints */ | |
e9ad5620 | 693 | struct mutex j_checkpoint_mutex; |
1da177e4 LT |
694 | |
695 | /* | |
696 | * Journal head: identifies the first unused block in the journal. | |
697 | * [j_state_lock] | |
698 | */ | |
699 | unsigned long j_head; | |
700 | ||
701 | /* | |
702 | * Journal tail: identifies the oldest still-used block in the journal. | |
703 | * [j_state_lock] | |
704 | */ | |
705 | unsigned long j_tail; | |
706 | ||
707 | /* | |
708 | * Journal free: how many free blocks are there in the journal? | |
709 | * [j_state_lock] | |
710 | */ | |
711 | unsigned long j_free; | |
712 | ||
713 | /* | |
714 | * Journal start and end: the block numbers of the first usable block | |
715 | * and one beyond the last usable block in the journal. [j_state_lock] | |
716 | */ | |
717 | unsigned long j_first; | |
718 | unsigned long j_last; | |
719 | ||
720 | /* | |
721 | * Device, blocksize and starting block offset for the location where we | |
722 | * store the journal. | |
723 | */ | |
724 | struct block_device *j_dev; | |
725 | int j_blocksize; | |
37ed3222 | 726 | unsigned long j_blk_offset; |
1da177e4 LT |
727 | |
728 | /* | |
729 | * Device which holds the client fs. For internal journal this will be | |
730 | * equal to j_dev. | |
731 | */ | |
732 | struct block_device *j_fs_dev; | |
733 | ||
734 | /* Total maximum capacity of the journal region on disk. */ | |
735 | unsigned int j_maxlen; | |
736 | ||
737 | /* | |
738 | * Protects the buffer lists and internal buffer state. | |
739 | */ | |
740 | spinlock_t j_list_lock; | |
741 | ||
742 | /* Optional inode where we store the journal. If present, all */ | |
743 | /* journal block numbers are mapped into this inode via */ | |
744 | /* bmap(). */ | |
745 | struct inode *j_inode; | |
746 | ||
747 | /* | |
748 | * Sequence number of the oldest transaction in the log [j_state_lock] | |
749 | */ | |
750 | tid_t j_tail_sequence; | |
751 | ||
752 | /* | |
753 | * Sequence number of the next transaction to grant [j_state_lock] | |
754 | */ | |
755 | tid_t j_transaction_sequence; | |
756 | ||
757 | /* | |
758 | * Sequence number of the most recently committed transaction | |
759 | * [j_state_lock]. | |
760 | */ | |
761 | tid_t j_commit_sequence; | |
762 | ||
763 | /* | |
764 | * Sequence number of the most recent transaction wanting commit | |
765 | * [j_state_lock] | |
766 | */ | |
767 | tid_t j_commit_request; | |
768 | ||
769 | /* | |
770 | * Journal uuid: identifies the object (filesystem, LVM volume etc) | |
771 | * backed by this journal. This will eventually be replaced by an array | |
772 | * of uuids, allowing us to index multiple devices within a single | |
773 | * journal and to perform atomic updates across them. | |
774 | */ | |
775 | __u8 j_uuid[16]; | |
776 | ||
777 | /* Pointer to the current commit thread for this journal */ | |
778 | struct task_struct *j_task; | |
779 | ||
780 | /* | |
781 | * Maximum number of metadata buffers to allow in a single compound | |
782 | * commit transaction | |
783 | */ | |
784 | int j_max_transaction_buffers; | |
785 | ||
786 | /* | |
787 | * What is the maximum transaction lifetime before we begin a commit? | |
788 | */ | |
789 | unsigned long j_commit_interval; | |
790 | ||
791 | /* The timer used to wakeup the commit thread: */ | |
e3df1898 | 792 | struct timer_list j_commit_timer; |
1da177e4 LT |
793 | |
794 | /* | |
795 | * The revoke table: maintains the list of revoked blocks in the | |
796 | * current transaction. [j_revoke_lock] | |
797 | */ | |
798 | spinlock_t j_revoke_lock; | |
799 | struct jbd_revoke_table_s *j_revoke; | |
800 | struct jbd_revoke_table_s *j_revoke_table[2]; | |
801 | ||
802 | /* | |
803 | * array of bhs for journal_commit_transaction | |
804 | */ | |
805 | struct buffer_head **j_wbuf; | |
806 | int j_wbufsize; | |
807 | ||
f420d4dc JB |
808 | /* |
809 | * this is the pid of the last person to run a synchronous operation | |
810 | * through the journal. | |
811 | */ | |
fe1dcbc4 AM |
812 | pid_t j_last_sync_writer; |
813 | ||
f420d4dc JB |
814 | /* |
815 | * the average amount of time in nanoseconds it takes to commit a | |
816 | * transaction to the disk. [j_state_lock] | |
817 | */ | |
818 | u64 j_average_commit_time; | |
819 | ||
1da177e4 LT |
820 | /* |
821 | * An opaque pointer to fs-private information. ext3 puts its | |
822 | * superblock pointer here | |
823 | */ | |
824 | void *j_private; | |
825 | }; | |
826 | ||
ae6ddcc5 MC |
827 | /* |
828 | * Journal flag definitions | |
1da177e4 LT |
829 | */ |
830 | #define JFS_UNMOUNT 0x001 /* Journal thread is being destroyed */ | |
831 | #define JFS_ABORT 0x002 /* Journaling has been aborted for errors. */ | |
832 | #define JFS_ACK_ERR 0x004 /* The errno in the sb has been acked */ | |
833 | #define JFS_FLUSHED 0x008 /* The journal superblock has been flushed */ | |
834 | #define JFS_LOADED 0x010 /* The journal superblock has been loaded */ | |
835 | #define JFS_BARRIER 0x020 /* Use IDE barriers */ | |
0e4fb5e2 HK |
836 | #define JFS_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file |
837 | * data write error in ordered | |
838 | * mode */ | |
1da177e4 | 839 | |
ae6ddcc5 | 840 | /* |
1da177e4 LT |
841 | * Function declarations for the journaling transaction and buffer |
842 | * management | |
843 | */ | |
844 | ||
845 | /* Filing buffers */ | |
1da177e4 LT |
846 | extern void journal_unfile_buffer(journal_t *, struct journal_head *); |
847 | extern void __journal_unfile_buffer(struct journal_head *); | |
848 | extern void __journal_refile_buffer(struct journal_head *); | |
849 | extern void journal_refile_buffer(journal_t *, struct journal_head *); | |
850 | extern void __journal_file_buffer(struct journal_head *, transaction_t *, int); | |
851 | extern void __journal_free_buffer(struct journal_head *bh); | |
852 | extern void journal_file_buffer(struct journal_head *, transaction_t *, int); | |
853 | extern void __journal_clean_data_list(transaction_t *transaction); | |
854 | ||
855 | /* Log buffer allocation */ | |
856 | extern struct journal_head * journal_get_descriptor_buffer(journal_t *); | |
857 | int journal_next_log_block(journal_t *, unsigned long *); | |
858 | ||
859 | /* Commit management */ | |
860 | extern void journal_commit_transaction(journal_t *); | |
861 | ||
862 | /* Checkpoint list management */ | |
863 | int __journal_clean_checkpoint_list(journal_t *journal); | |
78ce89c9 | 864 | int __journal_remove_checkpoint(struct journal_head *); |
1da177e4 LT |
865 | void __journal_insert_checkpoint(struct journal_head *, transaction_t *); |
866 | ||
867 | /* Buffer IO */ | |
ae6ddcc5 | 868 | extern int |
1da177e4 LT |
869 | journal_write_metadata_buffer(transaction_t *transaction, |
870 | struct journal_head *jh_in, | |
871 | struct journal_head **jh_out, | |
37ed3222 | 872 | unsigned long blocknr); |
1da177e4 LT |
873 | |
874 | /* Transaction locking */ | |
875 | extern void __wait_on_journal (journal_t *); | |
876 | ||
877 | /* | |
878 | * Journal locking. | |
879 | * | |
880 | * We need to lock the journal during transaction state changes so that nobody | |
881 | * ever tries to take a handle on the running transaction while we are in the | |
882 | * middle of moving it to the commit phase. j_state_lock does this. | |
883 | * | |
884 | * Note that the locking is completely interrupt unsafe. We never touch | |
885 | * journal structures from interrupts. | |
886 | */ | |
887 | ||
888 | static inline handle_t *journal_current_handle(void) | |
889 | { | |
890 | return current->journal_info; | |
891 | } | |
892 | ||
893 | /* The journaling code user interface: | |
894 | * | |
895 | * Create and destroy handles | |
ae6ddcc5 | 896 | * Register buffer modifications against the current transaction. |
1da177e4 LT |
897 | */ |
898 | ||
899 | extern handle_t *journal_start(journal_t *, int nblocks); | |
900 | extern int journal_restart (handle_t *, int nblocks); | |
901 | extern int journal_extend (handle_t *, int nblocks); | |
902 | extern int journal_get_write_access(handle_t *, struct buffer_head *); | |
903 | extern int journal_get_create_access (handle_t *, struct buffer_head *); | |
904 | extern int journal_get_undo_access(handle_t *, struct buffer_head *); | |
905 | extern int journal_dirty_data (handle_t *, struct buffer_head *); | |
906 | extern int journal_dirty_metadata (handle_t *, struct buffer_head *); | |
907 | extern void journal_release_buffer (handle_t *, struct buffer_head *); | |
908 | extern int journal_forget (handle_t *, struct buffer_head *); | |
909 | extern void journal_sync_buffer (struct buffer_head *); | |
2ff28e22 | 910 | extern void journal_invalidatepage(journal_t *, |
1da177e4 | 911 | struct page *, unsigned long); |
27496a8c | 912 | extern int journal_try_to_free_buffers(journal_t *, struct page *, gfp_t); |
1da177e4 LT |
913 | extern int journal_stop(handle_t *); |
914 | extern int journal_flush (journal_t *); | |
915 | extern void journal_lock_updates (journal_t *); | |
916 | extern void journal_unlock_updates (journal_t *); | |
917 | ||
918 | extern journal_t * journal_init_dev(struct block_device *bdev, | |
919 | struct block_device *fs_dev, | |
920 | int start, int len, int bsize); | |
921 | extern journal_t * journal_init_inode (struct inode *); | |
922 | extern int journal_update_format (journal_t *); | |
ae6ddcc5 | 923 | extern int journal_check_used_features |
1da177e4 | 924 | (journal_t *, unsigned long, unsigned long, unsigned long); |
ae6ddcc5 | 925 | extern int journal_check_available_features |
1da177e4 | 926 | (journal_t *, unsigned long, unsigned long, unsigned long); |
ae6ddcc5 | 927 | extern int journal_set_features |
1da177e4 LT |
928 | (journal_t *, unsigned long, unsigned long, unsigned long); |
929 | extern int journal_create (journal_t *); | |
930 | extern int journal_load (journal_t *journal); | |
4afe9785 | 931 | extern int journal_destroy (journal_t *); |
1da177e4 LT |
932 | extern int journal_recover (journal_t *journal); |
933 | extern int journal_wipe (journal_t *, int); | |
934 | extern int journal_skip_recovery (journal_t *); | |
935 | extern void journal_update_superblock (journal_t *, int); | |
1da177e4 LT |
936 | extern void journal_abort (journal_t *, int); |
937 | extern int journal_errno (journal_t *); | |
938 | extern void journal_ack_err (journal_t *); | |
939 | extern int journal_clear_err (journal_t *); | |
940 | extern int journal_bmap(journal_t *, unsigned long, unsigned long *); | |
941 | extern int journal_force_commit(journal_t *); | |
942 | ||
943 | /* | |
944 | * journal_head management | |
945 | */ | |
946 | struct journal_head *journal_add_journal_head(struct buffer_head *bh); | |
947 | struct journal_head *journal_grab_journal_head(struct buffer_head *bh); | |
948 | void journal_remove_journal_head(struct buffer_head *bh); | |
949 | void journal_put_journal_head(struct journal_head *jh); | |
950 | ||
951 | /* | |
952 | * handle management | |
953 | */ | |
e18b890b | 954 | extern struct kmem_cache *jbd_handle_cache; |
1da177e4 | 955 | |
dd0fc66f | 956 | static inline handle_t *jbd_alloc_handle(gfp_t gfp_flags) |
1da177e4 LT |
957 | { |
958 | return kmem_cache_alloc(jbd_handle_cache, gfp_flags); | |
959 | } | |
960 | ||
961 | static inline void jbd_free_handle(handle_t *handle) | |
962 | { | |
963 | kmem_cache_free(jbd_handle_cache, handle); | |
964 | } | |
965 | ||
966 | /* Primary revoke support */ | |
967 | #define JOURNAL_REVOKE_DEFAULT_HASH 256 | |
968 | extern int journal_init_revoke(journal_t *, int); | |
969 | extern void journal_destroy_revoke_caches(void); | |
970 | extern int journal_init_revoke_caches(void); | |
971 | ||
972 | extern void journal_destroy_revoke(journal_t *); | |
973 | extern int journal_revoke (handle_t *, | |
974 | unsigned long, struct buffer_head *); | |
975 | extern int journal_cancel_revoke(handle_t *, struct journal_head *); | |
976 | extern void journal_write_revoke_records(journal_t *, transaction_t *); | |
977 | ||
978 | /* Recovery revoke support */ | |
979 | extern int journal_set_revoke(journal_t *, unsigned long, tid_t); | |
980 | extern int journal_test_revoke(journal_t *, unsigned long, tid_t); | |
981 | extern void journal_clear_revoke(journal_t *); | |
1da177e4 LT |
982 | extern void journal_switch_revoke_table(journal_t *journal); |
983 | ||
984 | /* | |
985 | * The log thread user interface: | |
986 | * | |
987 | * Request space in the current transaction, and force transaction commit | |
988 | * transitions on demand. | |
989 | */ | |
990 | ||
991 | int __log_space_left(journal_t *); /* Called with journal locked */ | |
992 | int log_start_commit(journal_t *journal, tid_t tid); | |
993 | int __log_start_commit(journal_t *journal, tid_t tid); | |
994 | int journal_start_commit(journal_t *journal, tid_t *tid); | |
995 | int journal_force_commit_nested(journal_t *journal); | |
996 | int log_wait_commit(journal_t *journal, tid_t tid); | |
997 | int log_do_checkpoint(journal_t *journal); | |
998 | ||
999 | void __log_wait_for_space(journal_t *journal); | |
1000 | extern void __journal_drop_transaction(journal_t *, transaction_t *); | |
1001 | extern int cleanup_journal_tail(journal_t *); | |
1002 | ||
1003 | /* Debugging code only: */ | |
1004 | ||
1005 | #define jbd_ENOSYS() \ | |
1006 | do { \ | |
d5c003b4 | 1007 | printk (KERN_ERR "JBD unimplemented function %s\n", __func__); \ |
1da177e4 LT |
1008 | current->state = TASK_UNINTERRUPTIBLE; \ |
1009 | schedule(); \ | |
1010 | } while (1) | |
1011 | ||
1012 | /* | |
1013 | * is_journal_abort | |
1014 | * | |
1015 | * Simple test wrapper function to test the JFS_ABORT state flag. This | |
1016 | * bit, when set, indicates that we have had a fatal error somewhere, | |
1017 | * either inside the journaling layer or indicated to us by the client | |
1018 | * (eg. ext3), and that we and should not commit any further | |
ae6ddcc5 | 1019 | * transactions. |
1da177e4 LT |
1020 | */ |
1021 | ||
1022 | static inline int is_journal_aborted(journal_t *journal) | |
1023 | { | |
1024 | return journal->j_flags & JFS_ABORT; | |
1025 | } | |
1026 | ||
1027 | static inline int is_handle_aborted(handle_t *handle) | |
1028 | { | |
1029 | if (handle->h_aborted) | |
1030 | return 1; | |
1031 | return is_journal_aborted(handle->h_transaction->t_journal); | |
1032 | } | |
1033 | ||
1034 | static inline void journal_abort_handle(handle_t *handle) | |
1035 | { | |
1036 | handle->h_aborted = 1; | |
1037 | } | |
1038 | ||
1039 | #endif /* __KERNEL__ */ | |
1040 | ||
1041 | /* Comparison functions for transaction IDs: perform comparisons using | |
1042 | * modulo arithmetic so that they work over sequence number wraps. */ | |
1043 | ||
1044 | static inline int tid_gt(tid_t x, tid_t y) | |
1045 | { | |
1046 | int difference = (x - y); | |
1047 | return (difference > 0); | |
1048 | } | |
1049 | ||
1050 | static inline int tid_geq(tid_t x, tid_t y) | |
1051 | { | |
1052 | int difference = (x - y); | |
1053 | return (difference >= 0); | |
1054 | } | |
1055 | ||
1056 | extern int journal_blocks_per_page(struct inode *inode); | |
1057 | ||
1058 | /* | |
1059 | * Return the minimum number of blocks which must be free in the journal | |
1060 | * before a new transaction may be started. Must be called under j_state_lock. | |
1061 | */ | |
1062 | static inline int jbd_space_needed(journal_t *journal) | |
1063 | { | |
1064 | int nblocks = journal->j_max_transaction_buffers; | |
1065 | if (journal->j_committing_transaction) | |
1066 | nblocks += journal->j_committing_transaction-> | |
1067 | t_outstanding_credits; | |
1068 | return nblocks; | |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * Definitions which augment the buffer_head layer | |
1073 | */ | |
1074 | ||
1075 | /* journaling buffer types */ | |
1076 | #define BJ_None 0 /* Not journaled */ | |
1077 | #define BJ_SyncData 1 /* Normal data: flush before commit */ | |
1078 | #define BJ_Metadata 2 /* Normal journaled metadata */ | |
1079 | #define BJ_Forget 3 /* Buffer superseded by this transaction */ | |
1080 | #define BJ_IO 4 /* Buffer is for temporary IO use */ | |
1081 | #define BJ_Shadow 5 /* Buffer contents being shadowed to the log */ | |
1082 | #define BJ_LogCtl 6 /* Buffer contains log descriptors */ | |
1083 | #define BJ_Reserved 7 /* Buffer is reserved for access by journal */ | |
1084 | #define BJ_Locked 8 /* Locked for I/O during commit */ | |
1085 | #define BJ_Types 9 | |
ae6ddcc5 | 1086 | |
1da177e4 LT |
1087 | extern int jbd_blocks_per_page(struct inode *inode); |
1088 | ||
1089 | #ifdef __KERNEL__ | |
1090 | ||
1091 | #define buffer_trace_init(bh) do {} while (0) | |
1092 | #define print_buffer_fields(bh) do {} while (0) | |
1093 | #define print_buffer_trace(bh) do {} while (0) | |
1094 | #define BUFFER_TRACE(bh, info) do {} while (0) | |
1095 | #define BUFFER_TRACE2(bh, bh2, info) do {} while (0) | |
1096 | #define JBUFFER_TRACE(jh, info) do {} while (0) | |
1097 | ||
1098 | #endif /* __KERNEL__ */ | |
1099 | ||
1da177e4 | 1100 | #endif /* _LINUX_JBD_H */ |