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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> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
e3df1898 | 35 | |
1da177e4 LT |
36 | #define journal_oom_retry 1 |
37 | ||
38 | /* | |
0cbfdc86 | 39 | * Define JBD_PARANOID_IOFAIL to cause a kernel BUG() if ext3 finds |
1da177e4 LT |
40 | * certain classes of error which can occur due to failed IOs. Under |
41 | * normal use we want ext3 to continue after such errors, because | |
42 | * hardware _can_ fail, but for debugging purposes when running tests on | |
43 | * known-good hardware we may want to trap these errors. | |
44 | */ | |
45 | #undef JBD_PARANOID_IOFAIL | |
46 | ||
47 | /* | |
48 | * The default maximum commit age, in seconds. | |
49 | */ | |
50 | #define JBD_DEFAULT_MAX_COMMIT_AGE 5 | |
51 | ||
52 | #ifdef CONFIG_JBD_DEBUG | |
53 | /* | |
54 | * Define JBD_EXPENSIVE_CHECKING to enable more expensive internal | |
55 | * consistency checks. By default we don't do this unless | |
56 | * CONFIG_JBD_DEBUG is on. | |
57 | */ | |
58 | #define JBD_EXPENSIVE_CHECKING | |
c2a9159c | 59 | extern u8 journal_enable_debug; |
1da177e4 LT |
60 | |
61 | #define jbd_debug(n, f, a...) \ | |
62 | do { \ | |
63 | if ((n) <= journal_enable_debug) { \ | |
64 | printk (KERN_DEBUG "(%s, %d): %s: ", \ | |
d5c003b4 | 65 | __FILE__, __LINE__, __func__); \ |
e9ad5620 | 66 | printk (f, ## a); \ |
1da177e4 LT |
67 | } \ |
68 | } while (0) | |
69 | #else | |
70 | #define jbd_debug(f, a...) /**/ | |
71 | #endif | |
72 | ||
c089d490 MC |
73 | static inline void *jbd_alloc(size_t size, gfp_t flags) |
74 | { | |
75 | return (void *)__get_free_pages(flags, get_order(size)); | |
76 | } | |
77 | ||
78 | static inline void jbd_free(void *ptr, size_t size) | |
79 | { | |
80 | free_pages((unsigned long)ptr, get_order(size)); | |
81 | }; | |
82 | ||
1da177e4 LT |
83 | #define JFS_MIN_JOURNAL_BLOCKS 1024 |
84 | ||
1da177e4 LT |
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 | |
ae6ddcc5 MC |
99 | * outstanding updates on a transaction might possibly touch. |
100 | * | |
1da177e4 LT |
101 | * This is an opaque datatype. |
102 | **/ | |
103 | typedef 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. | |
ae6ddcc5 | 110 | * |
1da177e4 LT |
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 | **/ | |
117 | typedef struct journal_s journal_t; /* Journal control structure */ | |
118 | #endif | |
119 | ||
120 | /* | |
121 | * Internal structures used by the logging mechanism: | |
122 | */ | |
123 | ||
124 | #define JFS_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */ | |
125 | ||
126 | /* | |
127 | * On-disk structures | |
128 | */ | |
129 | ||
ae6ddcc5 | 130 | /* |
1da177e4 LT |
131 | * Descriptor block types: |
132 | */ | |
133 | ||
134 | #define JFS_DESCRIPTOR_BLOCK 1 | |
135 | #define JFS_COMMIT_BLOCK 2 | |
136 | #define JFS_SUPERBLOCK_V1 3 | |
137 | #define JFS_SUPERBLOCK_V2 4 | |
138 | #define JFS_REVOKE_BLOCK 5 | |
139 | ||
140 | /* | |
141 | * Standard header for all descriptor blocks: | |
142 | */ | |
143 | typedef struct journal_header_s | |
144 | { | |
145 | __be32 h_magic; | |
146 | __be32 h_blocktype; | |
147 | __be32 h_sequence; | |
148 | } journal_header_t; | |
149 | ||
150 | ||
ae6ddcc5 MC |
151 | /* |
152 | * The block tag: used to describe a single buffer in the journal | |
1da177e4 LT |
153 | */ |
154 | typedef struct journal_block_tag_s | |
155 | { | |
156 | __be32 t_blocknr; /* The on-disk block number */ | |
157 | __be32 t_flags; /* See below */ | |
158 | } journal_block_tag_t; | |
159 | ||
ae6ddcc5 | 160 | /* |
1da177e4 | 161 | * The revoke descriptor: used on disk to describe a series of blocks to |
ae6ddcc5 | 162 | * be revoked from the log |
1da177e4 LT |
163 | */ |
164 | typedef struct journal_revoke_header_s | |
165 | { | |
166 | journal_header_t r_header; | |
167 | __be32 r_count; /* Count of bytes used in the block */ | |
168 | } journal_revoke_header_t; | |
169 | ||
170 | ||
171 | /* Definitions for the journal tag flags word: */ | |
172 | #define JFS_FLAG_ESCAPE 1 /* on-disk block is escaped */ | |
173 | #define JFS_FLAG_SAME_UUID 2 /* block has same uuid as previous */ | |
174 | #define JFS_FLAG_DELETED 4 /* block deleted by this transaction */ | |
175 | #define JFS_FLAG_LAST_TAG 8 /* last tag in this descriptor block */ | |
176 | ||
177 | ||
178 | /* | |
179 | * The journal superblock. All fields are in big-endian byte order. | |
180 | */ | |
181 | typedef struct journal_superblock_s | |
182 | { | |
183 | /* 0x0000 */ | |
184 | journal_header_t s_header; | |
185 | ||
186 | /* 0x000C */ | |
187 | /* Static information describing the journal */ | |
188 | __be32 s_blocksize; /* journal device blocksize */ | |
189 | __be32 s_maxlen; /* total blocks in journal file */ | |
190 | __be32 s_first; /* first block of log information */ | |
191 | ||
192 | /* 0x0018 */ | |
193 | /* Dynamic information describing the current state of the log */ | |
194 | __be32 s_sequence; /* first commit ID expected in log */ | |
195 | __be32 s_start; /* blocknr of start of log */ | |
196 | ||
197 | /* 0x0020 */ | |
198 | /* Error value, as set by journal_abort(). */ | |
199 | __be32 s_errno; | |
200 | ||
201 | /* 0x0024 */ | |
202 | /* Remaining fields are only valid in a version-2 superblock */ | |
e9ad5620 DK |
203 | __be32 s_feature_compat; /* compatible feature set */ |
204 | __be32 s_feature_incompat; /* incompatible feature set */ | |
205 | __be32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
1da177e4 LT |
206 | /* 0x0030 */ |
207 | __u8 s_uuid[16]; /* 128-bit uuid for journal */ | |
208 | ||
209 | /* 0x0040 */ | |
210 | __be32 s_nr_users; /* Nr of filesystems sharing log */ | |
211 | ||
212 | __be32 s_dynsuper; /* Blocknr of dynamic superblock copy*/ | |
213 | ||
214 | /* 0x0048 */ | |
215 | __be32 s_max_transaction; /* Limit of journal blocks per trans.*/ | |
216 | __be32 s_max_trans_data; /* Limit of data blocks per trans. */ | |
217 | ||
218 | /* 0x0050 */ | |
219 | __u32 s_padding[44]; | |
220 | ||
221 | /* 0x0100 */ | |
222 | __u8 s_users[16*48]; /* ids of all fs'es sharing the log */ | |
223 | /* 0x0400 */ | |
224 | } journal_superblock_t; | |
225 | ||
226 | #define JFS_HAS_COMPAT_FEATURE(j,mask) \ | |
227 | ((j)->j_format_version >= 2 && \ | |
228 | ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask)))) | |
229 | #define JFS_HAS_RO_COMPAT_FEATURE(j,mask) \ | |
230 | ((j)->j_format_version >= 2 && \ | |
231 | ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask)))) | |
232 | #define JFS_HAS_INCOMPAT_FEATURE(j,mask) \ | |
233 | ((j)->j_format_version >= 2 && \ | |
234 | ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask)))) | |
235 | ||
236 | #define JFS_FEATURE_INCOMPAT_REVOKE 0x00000001 | |
237 | ||
238 | /* Features known to this kernel version: */ | |
239 | #define JFS_KNOWN_COMPAT_FEATURES 0 | |
240 | #define JFS_KNOWN_ROCOMPAT_FEATURES 0 | |
241 | #define JFS_KNOWN_INCOMPAT_FEATURES JFS_FEATURE_INCOMPAT_REVOKE | |
242 | ||
243 | #ifdef __KERNEL__ | |
244 | ||
245 | #include <linux/fs.h> | |
246 | #include <linux/sched.h> | |
1da177e4 | 247 | |
1c099244 | 248 | #define J_ASSERT(assert) BUG_ON(!(assert)) |
1da177e4 | 249 | |
1da177e4 LT |
250 | #define J_ASSERT_BH(bh, expr) J_ASSERT(expr) |
251 | #define J_ASSERT_JH(jh, expr) J_ASSERT(expr) | |
1da177e4 | 252 | |
1da177e4 LT |
253 | #if defined(JBD_PARANOID_IOFAIL) |
254 | #define J_EXPECT(expr, why...) J_ASSERT(expr) | |
255 | #define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr) | |
256 | #define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr) | |
257 | #else | |
258 | #define __journal_expect(expr, why...) \ | |
259 | ({ \ | |
260 | int val = (expr); \ | |
261 | if (!val) { \ | |
262 | printk(KERN_ERR \ | |
263 | "EXT3-fs unexpected failure: %s;\n",# expr); \ | |
264 | printk(KERN_ERR why "\n"); \ | |
265 | } \ | |
266 | val; \ | |
267 | }) | |
268 | #define J_EXPECT(expr, why...) __journal_expect(expr, ## why) | |
269 | #define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why) | |
270 | #define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why) | |
271 | #endif | |
272 | ||
273 | enum jbd_state_bits { | |
274 | BH_JBD /* Has an attached ext3 journal_head */ | |
275 | = BH_PrivateStart, | |
276 | BH_JWrite, /* Being written to log (@@@ DEBUGGING) */ | |
277 | BH_Freed, /* Has been freed (truncated) */ | |
278 | BH_Revoked, /* Has been revoked from the log */ | |
279 | BH_RevokeValid, /* Revoked flag is valid */ | |
280 | BH_JBDDirty, /* Is dirty but journaled */ | |
281 | BH_State, /* Pins most journal_head state */ | |
282 | BH_JournalHead, /* Pins bh->b_private and jh->b_bh */ | |
283 | BH_Unshadow, /* Dummy bit, for BJ_Shadow wakeup filtering */ | |
284 | }; | |
285 | ||
286 | BUFFER_FNS(JBD, jbd) | |
287 | BUFFER_FNS(JWrite, jwrite) | |
288 | BUFFER_FNS(JBDDirty, jbddirty) | |
289 | TAS_BUFFER_FNS(JBDDirty, jbddirty) | |
290 | BUFFER_FNS(Revoked, revoked) | |
291 | TAS_BUFFER_FNS(Revoked, revoked) | |
292 | BUFFER_FNS(RevokeValid, revokevalid) | |
293 | TAS_BUFFER_FNS(RevokeValid, revokevalid) | |
294 | BUFFER_FNS(Freed, freed) | |
295 | ||
296 | static inline struct buffer_head *jh2bh(struct journal_head *jh) | |
297 | { | |
298 | return jh->b_bh; | |
299 | } | |
300 | ||
301 | static inline struct journal_head *bh2jh(struct buffer_head *bh) | |
302 | { | |
303 | return bh->b_private; | |
304 | } | |
305 | ||
306 | static inline void jbd_lock_bh_state(struct buffer_head *bh) | |
307 | { | |
308 | bit_spin_lock(BH_State, &bh->b_state); | |
309 | } | |
310 | ||
311 | static inline int jbd_trylock_bh_state(struct buffer_head *bh) | |
312 | { | |
313 | return bit_spin_trylock(BH_State, &bh->b_state); | |
314 | } | |
315 | ||
316 | static inline int jbd_is_locked_bh_state(struct buffer_head *bh) | |
317 | { | |
318 | return bit_spin_is_locked(BH_State, &bh->b_state); | |
319 | } | |
320 | ||
321 | static inline void jbd_unlock_bh_state(struct buffer_head *bh) | |
322 | { | |
323 | bit_spin_unlock(BH_State, &bh->b_state); | |
324 | } | |
325 | ||
326 | static inline void jbd_lock_bh_journal_head(struct buffer_head *bh) | |
327 | { | |
328 | bit_spin_lock(BH_JournalHead, &bh->b_state); | |
329 | } | |
330 | ||
331 | static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh) | |
332 | { | |
333 | bit_spin_unlock(BH_JournalHead, &bh->b_state); | |
334 | } | |
335 | ||
336 | struct jbd_revoke_table_s; | |
337 | ||
338 | /** | |
a6b91919 | 339 | * struct handle_s - this is the concrete type associated with handle_t. |
1da177e4 LT |
340 | * @h_transaction: Which compound transaction is this update a part of? |
341 | * @h_buffer_credits: Number of remaining buffers we are allowed to dirty. | |
342 | * @h_ref: Reference count on this handle | |
343 | * @h_err: Field for caller's use to track errors through large fs operations | |
344 | * @h_sync: flag for sync-on-close | |
345 | * @h_jdata: flag to force data journaling | |
346 | * @h_aborted: flag indicating fatal error on handle | |
e6716b87 | 347 | * @h_lockdep_map: lockdep info for debugging lock problems |
1da177e4 | 348 | */ |
ae6ddcc5 | 349 | struct handle_s |
1da177e4 LT |
350 | { |
351 | /* Which compound transaction is this update a part of? */ | |
352 | transaction_t *h_transaction; | |
353 | ||
354 | /* Number of remaining buffers we are allowed to dirty: */ | |
355 | int h_buffer_credits; | |
356 | ||
357 | /* Reference count on this handle */ | |
358 | int h_ref; | |
359 | ||
360 | /* Field for caller's use to track errors through large fs */ | |
361 | /* operations */ | |
362 | int h_err; | |
363 | ||
364 | /* Flags [no locking] */ | |
365 | unsigned int h_sync: 1; /* sync-on-close */ | |
366 | unsigned int h_jdata: 1; /* force data journaling */ | |
367 | unsigned int h_aborted: 1; /* fatal error on handle */ | |
34a3d1e8 PZ |
368 | |
369 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
370 | struct lockdep_map h_lockdep_map; | |
371 | #endif | |
1da177e4 LT |
372 | }; |
373 | ||
374 | ||
375 | /* The transaction_t type is the guts of the journaling mechanism. It | |
376 | * tracks a compound transaction through its various states: | |
377 | * | |
378 | * RUNNING: accepting new updates | |
379 | * LOCKED: Updates still running but we don't accept new ones | |
380 | * RUNDOWN: Updates are tidying up but have finished requesting | |
381 | * new buffers to modify (state not used for now) | |
382 | * FLUSH: All updates complete, but we are still writing to disk | |
383 | * COMMIT: All data on disk, writing commit record | |
384 | * FINISHED: We still have to keep the transaction for checkpointing. | |
385 | * | |
386 | * The transaction keeps track of all of the buffers modified by a | |
387 | * running transaction, and all of the buffers committed but not yet | |
388 | * flushed to home for finished transactions. | |
389 | */ | |
390 | ||
391 | /* | |
392 | * Lock ranking: | |
393 | * | |
394 | * j_list_lock | |
395 | * ->jbd_lock_bh_journal_head() (This is "innermost") | |
396 | * | |
397 | * j_state_lock | |
398 | * ->jbd_lock_bh_state() | |
399 | * | |
400 | * jbd_lock_bh_state() | |
401 | * ->j_list_lock | |
402 | * | |
403 | * j_state_lock | |
404 | * ->t_handle_lock | |
405 | * | |
406 | * j_state_lock | |
407 | * ->j_list_lock (journal_unmap_buffer) | |
408 | * | |
409 | */ | |
410 | ||
ae6ddcc5 | 411 | struct transaction_s |
1da177e4 LT |
412 | { |
413 | /* Pointer to the journal for this transaction. [no locking] */ | |
414 | journal_t *t_journal; | |
415 | ||
416 | /* Sequence number for this transaction [no locking] */ | |
417 | tid_t t_tid; | |
418 | ||
419 | /* | |
420 | * Transaction's current state | |
421 | * [no locking - only kjournald alters this] | |
d4beaf4a JK |
422 | * [j_list_lock] guards transition of a transaction into T_FINISHED |
423 | * state and subsequent call of __journal_drop_transaction() | |
1da177e4 LT |
424 | * FIXME: needs barriers |
425 | * KLUDGE: [use j_state_lock] | |
426 | */ | |
427 | enum { | |
428 | T_RUNNING, | |
429 | T_LOCKED, | |
1da177e4 LT |
430 | T_FLUSH, |
431 | T_COMMIT, | |
03f4d804 | 432 | T_COMMIT_RECORD, |
ae6ddcc5 | 433 | T_FINISHED |
1da177e4 LT |
434 | } t_state; |
435 | ||
436 | /* | |
437 | * Where in the log does this transaction's commit start? [no locking] | |
438 | */ | |
9c28cbcc | 439 | unsigned int t_log_start; |
1da177e4 LT |
440 | |
441 | /* Number of buffers on the t_buffers list [j_list_lock] */ | |
442 | int t_nr_buffers; | |
443 | ||
444 | /* | |
445 | * Doubly-linked circular list of all buffers reserved but not yet | |
446 | * modified by this transaction [j_list_lock] | |
447 | */ | |
448 | struct journal_head *t_reserved_list; | |
449 | ||
450 | /* | |
451 | * Doubly-linked circular list of all buffers under writeout during | |
452 | * commit [j_list_lock] | |
453 | */ | |
454 | struct journal_head *t_locked_list; | |
455 | ||
456 | /* | |
457 | * Doubly-linked circular list of all metadata buffers owned by this | |
458 | * transaction [j_list_lock] | |
459 | */ | |
460 | struct journal_head *t_buffers; | |
461 | ||
462 | /* | |
463 | * Doubly-linked circular list of all data buffers still to be | |
464 | * flushed before this transaction can be committed [j_list_lock] | |
465 | */ | |
466 | struct journal_head *t_sync_datalist; | |
467 | ||
468 | /* | |
469 | * Doubly-linked circular list of all forget buffers (superseded | |
470 | * buffers which we can un-checkpoint once this transaction commits) | |
471 | * [j_list_lock] | |
472 | */ | |
473 | struct journal_head *t_forget; | |
474 | ||
475 | /* | |
476 | * Doubly-linked circular list of all buffers still to be flushed before | |
477 | * this transaction can be checkpointed. [j_list_lock] | |
478 | */ | |
479 | struct journal_head *t_checkpoint_list; | |
480 | ||
78ce89c9 JK |
481 | /* |
482 | * Doubly-linked circular list of all buffers submitted for IO while | |
483 | * checkpointing. [j_list_lock] | |
484 | */ | |
485 | struct journal_head *t_checkpoint_io_list; | |
486 | ||
1da177e4 LT |
487 | /* |
488 | * Doubly-linked circular list of temporary buffers currently undergoing | |
489 | * IO in the log [j_list_lock] | |
490 | */ | |
491 | struct journal_head *t_iobuf_list; | |
492 | ||
493 | /* | |
494 | * Doubly-linked circular list of metadata buffers being shadowed by log | |
495 | * IO. The IO buffers on the iobuf list and the shadow buffers on this | |
496 | * list match each other one for one at all times. [j_list_lock] | |
497 | */ | |
498 | struct journal_head *t_shadow_list; | |
499 | ||
500 | /* | |
501 | * Doubly-linked circular list of control buffers being written to the | |
502 | * log. [j_list_lock] | |
503 | */ | |
504 | struct journal_head *t_log_list; | |
505 | ||
506 | /* | |
507 | * Protects info related to handles | |
508 | */ | |
509 | spinlock_t t_handle_lock; | |
510 | ||
511 | /* | |
512 | * Number of outstanding updates running on this transaction | |
513 | * [t_handle_lock] | |
514 | */ | |
515 | int t_updates; | |
516 | ||
517 | /* | |
518 | * Number of buffers reserved for use by all handles in this transaction | |
519 | * handle but not yet modified. [t_handle_lock] | |
520 | */ | |
521 | int t_outstanding_credits; | |
522 | ||
523 | /* | |
524 | * Forward and backward links for the circular list of all transactions | |
525 | * awaiting checkpoint. [j_list_lock] | |
526 | */ | |
527 | transaction_t *t_cpnext, *t_cpprev; | |
528 | ||
529 | /* | |
530 | * When will the transaction expire (become due for commit), in jiffies? | |
531 | * [no locking] | |
532 | */ | |
533 | unsigned long t_expires; | |
534 | ||
f420d4dc JB |
535 | /* |
536 | * When this transaction started, in nanoseconds [no locking] | |
537 | */ | |
538 | ktime_t t_start_time; | |
539 | ||
1da177e4 LT |
540 | /* |
541 | * How many handles used this transaction? [t_handle_lock] | |
542 | */ | |
543 | int t_handle_count; | |
544 | ||
512a0043 TT |
545 | /* |
546 | * This transaction is being forced and some process is | |
547 | * waiting for it to finish. | |
548 | */ | |
4fefce9a | 549 | unsigned int t_synchronous_commit:1; |
1da177e4 LT |
550 | }; |
551 | ||
552 | /** | |
a6b91919 | 553 | * struct journal_s - this is the concrete type associated with journal_t. |
1da177e4 LT |
554 | * @j_flags: General journaling state flags |
555 | * @j_errno: Is there an outstanding uncleared error on the journal (from a | |
ae6ddcc5 | 556 | * prior abort)? |
1da177e4 LT |
557 | * @j_sb_buffer: First part of superblock buffer |
558 | * @j_superblock: Second part of superblock buffer | |
559 | * @j_format_version: Version of the superblock format | |
560 | * @j_state_lock: Protect the various scalars in the journal | |
561 | * @j_barrier_count: Number of processes waiting to create a barrier lock | |
562 | * @j_barrier: The barrier lock itself | |
563 | * @j_running_transaction: The current running transaction.. | |
564 | * @j_committing_transaction: the transaction we are pushing to disk | |
565 | * @j_checkpoint_transactions: a linked circular list of all transactions | |
566 | * waiting for checkpointing | |
567 | * @j_wait_transaction_locked: Wait queue for waiting for a locked transaction | |
568 | * to start committing, or for a barrier lock to be released | |
569 | * @j_wait_logspace: Wait queue for waiting for checkpointing to complete | |
ae6ddcc5 | 570 | * @j_wait_done_commit: Wait queue for waiting for commit to complete |
1da177e4 LT |
571 | * @j_wait_checkpoint: Wait queue to trigger checkpointing |
572 | * @j_wait_commit: Wait queue to trigger commit | |
573 | * @j_wait_updates: Wait queue to wait for updates to complete | |
2c68ee75 | 574 | * @j_checkpoint_mutex: Mutex for locking against concurrent checkpoints |
1da177e4 LT |
575 | * @j_head: Journal head - identifies the first unused block in the journal |
576 | * @j_tail: Journal tail - identifies the oldest still-used block in the | |
577 | * journal. | |
578 | * @j_free: Journal free - how many free blocks are there in the journal? | |
ae6ddcc5 | 579 | * @j_first: The block number of the first usable block |
1da177e4 LT |
580 | * @j_last: The block number one beyond the last usable block |
581 | * @j_dev: Device where we store the journal | |
582 | * @j_blocksize: blocksize for the location where we store the journal. | |
583 | * @j_blk_offset: starting block offset for into the device where we store the | |
584 | * journal | |
585 | * @j_fs_dev: Device which holds the client fs. For internal journal this will | |
586 | * be equal to j_dev | |
587 | * @j_maxlen: Total maximum capacity of the journal region on disk. | |
588 | * @j_list_lock: Protects the buffer lists and internal buffer state. | |
589 | * @j_inode: Optional inode where we store the journal. If present, all journal | |
590 | * block numbers are mapped into this inode via bmap(). | |
ae6ddcc5 | 591 | * @j_tail_sequence: Sequence number of the oldest transaction in the log |
1da177e4 LT |
592 | * @j_transaction_sequence: Sequence number of the next transaction to grant |
593 | * @j_commit_sequence: Sequence number of the most recently committed | |
594 | * transaction | |
595 | * @j_commit_request: Sequence number of the most recent transaction wanting | |
ae6ddcc5 | 596 | * commit |
1da177e4 LT |
597 | * @j_uuid: Uuid of client object. |
598 | * @j_task: Pointer to the current commit thread for this journal | |
599 | * @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a | |
600 | * single compound commit transaction | |
601 | * @j_commit_interval: What is the maximum transaction lifetime before we begin | |
602 | * a commit? | |
603 | * @j_commit_timer: The timer used to wakeup the commit thread | |
604 | * @j_revoke_lock: Protect the revoke table | |
605 | * @j_revoke: The revoke table - maintains the list of revoked blocks in the | |
606 | * current transaction. | |
607 | * @j_revoke_table: alternate revoke tables for j_revoke | |
6c8bec6d RD |
608 | * @j_wbuf: array of buffer_heads for journal_commit_transaction |
609 | * @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the | |
610 | * number that will fit in j_blocksize | |
fe1dcbc4 | 611 | * @j_last_sync_writer: most recent pid which did a synchronous write |
3eabdb76 RD |
612 | * @j_average_commit_time: the average amount of time in nanoseconds it |
613 | * takes to commit a transaction to the disk. | |
1da177e4 LT |
614 | * @j_private: An opaque pointer to fs-private information. |
615 | */ | |
616 | ||
617 | struct journal_s | |
618 | { | |
619 | /* General journaling state flags [j_state_lock] */ | |
620 | unsigned long j_flags; | |
621 | ||
622 | /* | |
623 | * Is there an outstanding uncleared error on the journal (from a prior | |
624 | * abort)? [j_state_lock] | |
625 | */ | |
626 | int j_errno; | |
627 | ||
628 | /* The superblock buffer */ | |
629 | struct buffer_head *j_sb_buffer; | |
630 | journal_superblock_t *j_superblock; | |
631 | ||
632 | /* Version of the superblock format */ | |
633 | int j_format_version; | |
634 | ||
635 | /* | |
636 | * Protect the various scalars in the journal | |
637 | */ | |
638 | spinlock_t j_state_lock; | |
639 | ||
640 | /* | |
641 | * Number of processes waiting to create a barrier lock [j_state_lock] | |
642 | */ | |
643 | int j_barrier_count; | |
644 | ||
645 | /* The barrier lock itself */ | |
2c68ee75 | 646 | struct mutex j_barrier; |
1da177e4 LT |
647 | |
648 | /* | |
649 | * Transactions: The current running transaction... | |
650 | * [j_state_lock] [caller holding open handle] | |
651 | */ | |
652 | transaction_t *j_running_transaction; | |
653 | ||
654 | /* | |
655 | * the transaction we are pushing to disk | |
656 | * [j_state_lock] [caller holding open handle] | |
657 | */ | |
658 | transaction_t *j_committing_transaction; | |
659 | ||
660 | /* | |
661 | * ... and a linked circular list of all transactions waiting for | |
662 | * checkpointing. [j_list_lock] | |
663 | */ | |
664 | transaction_t *j_checkpoint_transactions; | |
665 | ||
666 | /* | |
667 | * Wait queue for waiting for a locked transaction to start committing, | |
668 | * or for a barrier lock to be released | |
669 | */ | |
670 | wait_queue_head_t j_wait_transaction_locked; | |
671 | ||
672 | /* Wait queue for waiting for checkpointing to complete */ | |
673 | wait_queue_head_t j_wait_logspace; | |
674 | ||
675 | /* Wait queue for waiting for commit to complete */ | |
676 | wait_queue_head_t j_wait_done_commit; | |
677 | ||
678 | /* Wait queue to trigger checkpointing */ | |
679 | wait_queue_head_t j_wait_checkpoint; | |
680 | ||
681 | /* Wait queue to trigger commit */ | |
682 | wait_queue_head_t j_wait_commit; | |
683 | ||
684 | /* Wait queue to wait for updates to complete */ | |
685 | wait_queue_head_t j_wait_updates; | |
686 | ||
687 | /* Semaphore for locking against concurrent checkpoints */ | |
e9ad5620 | 688 | struct mutex j_checkpoint_mutex; |
1da177e4 LT |
689 | |
690 | /* | |
691 | * Journal head: identifies the first unused block in the journal. | |
692 | * [j_state_lock] | |
693 | */ | |
9c28cbcc | 694 | unsigned int j_head; |
1da177e4 LT |
695 | |
696 | /* | |
697 | * Journal tail: identifies the oldest still-used block in the journal. | |
698 | * [j_state_lock] | |
699 | */ | |
9c28cbcc | 700 | unsigned int j_tail; |
1da177e4 LT |
701 | |
702 | /* | |
703 | * Journal free: how many free blocks are there in the journal? | |
704 | * [j_state_lock] | |
705 | */ | |
9c28cbcc | 706 | unsigned int j_free; |
1da177e4 LT |
707 | |
708 | /* | |
709 | * Journal start and end: the block numbers of the first usable block | |
710 | * and one beyond the last usable block in the journal. [j_state_lock] | |
711 | */ | |
9c28cbcc JK |
712 | unsigned int j_first; |
713 | unsigned int j_last; | |
1da177e4 LT |
714 | |
715 | /* | |
716 | * Device, blocksize and starting block offset for the location where we | |
717 | * store the journal. | |
718 | */ | |
719 | struct block_device *j_dev; | |
720 | int j_blocksize; | |
9c28cbcc | 721 | unsigned int j_blk_offset; |
1da177e4 LT |
722 | |
723 | /* | |
724 | * Device which holds the client fs. For internal journal this will be | |
725 | * equal to j_dev. | |
726 | */ | |
727 | struct block_device *j_fs_dev; | |
728 | ||
729 | /* Total maximum capacity of the journal region on disk. */ | |
730 | unsigned int j_maxlen; | |
731 | ||
732 | /* | |
733 | * Protects the buffer lists and internal buffer state. | |
734 | */ | |
735 | spinlock_t j_list_lock; | |
736 | ||
737 | /* Optional inode where we store the journal. If present, all */ | |
738 | /* journal block numbers are mapped into this inode via */ | |
739 | /* bmap(). */ | |
740 | struct inode *j_inode; | |
741 | ||
742 | /* | |
743 | * Sequence number of the oldest transaction in the log [j_state_lock] | |
744 | */ | |
745 | tid_t j_tail_sequence; | |
746 | ||
747 | /* | |
748 | * Sequence number of the next transaction to grant [j_state_lock] | |
749 | */ | |
750 | tid_t j_transaction_sequence; | |
751 | ||
752 | /* | |
753 | * Sequence number of the most recently committed transaction | |
754 | * [j_state_lock]. | |
755 | */ | |
756 | tid_t j_commit_sequence; | |
757 | ||
758 | /* | |
759 | * Sequence number of the most recent transaction wanting commit | |
760 | * [j_state_lock] | |
761 | */ | |
762 | tid_t j_commit_request; | |
763 | ||
764 | /* | |
765 | * Journal uuid: identifies the object (filesystem, LVM volume etc) | |
766 | * backed by this journal. This will eventually be replaced by an array | |
767 | * of uuids, allowing us to index multiple devices within a single | |
768 | * journal and to perform atomic updates across them. | |
769 | */ | |
770 | __u8 j_uuid[16]; | |
771 | ||
772 | /* Pointer to the current commit thread for this journal */ | |
773 | struct task_struct *j_task; | |
774 | ||
775 | /* | |
776 | * Maximum number of metadata buffers to allow in a single compound | |
777 | * commit transaction | |
778 | */ | |
779 | int j_max_transaction_buffers; | |
780 | ||
781 | /* | |
782 | * What is the maximum transaction lifetime before we begin a commit? | |
783 | */ | |
784 | unsigned long j_commit_interval; | |
785 | ||
786 | /* The timer used to wakeup the commit thread: */ | |
e3df1898 | 787 | struct timer_list j_commit_timer; |
1da177e4 LT |
788 | |
789 | /* | |
790 | * The revoke table: maintains the list of revoked blocks in the | |
791 | * current transaction. [j_revoke_lock] | |
792 | */ | |
793 | spinlock_t j_revoke_lock; | |
794 | struct jbd_revoke_table_s *j_revoke; | |
795 | struct jbd_revoke_table_s *j_revoke_table[2]; | |
796 | ||
797 | /* | |
798 | * array of bhs for journal_commit_transaction | |
799 | */ | |
800 | struct buffer_head **j_wbuf; | |
801 | int j_wbufsize; | |
802 | ||
f420d4dc JB |
803 | /* |
804 | * this is the pid of the last person to run a synchronous operation | |
805 | * through the journal. | |
806 | */ | |
fe1dcbc4 AM |
807 | pid_t j_last_sync_writer; |
808 | ||
f420d4dc JB |
809 | /* |
810 | * the average amount of time in nanoseconds it takes to commit a | |
811 | * transaction to the disk. [j_state_lock] | |
812 | */ | |
813 | u64 j_average_commit_time; | |
814 | ||
1da177e4 LT |
815 | /* |
816 | * An opaque pointer to fs-private information. ext3 puts its | |
817 | * superblock pointer here | |
818 | */ | |
819 | void *j_private; | |
820 | }; | |
821 | ||
ae6ddcc5 MC |
822 | /* |
823 | * Journal flag definitions | |
1da177e4 LT |
824 | */ |
825 | #define JFS_UNMOUNT 0x001 /* Journal thread is being destroyed */ | |
826 | #define JFS_ABORT 0x002 /* Journaling has been aborted for errors. */ | |
827 | #define JFS_ACK_ERR 0x004 /* The errno in the sb has been acked */ | |
828 | #define JFS_FLUSHED 0x008 /* The journal superblock has been flushed */ | |
829 | #define JFS_LOADED 0x010 /* The journal superblock has been loaded */ | |
830 | #define JFS_BARRIER 0x020 /* Use IDE barriers */ | |
0e4fb5e2 HK |
831 | #define JFS_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file |
832 | * data write error in ordered | |
833 | * mode */ | |
1da177e4 | 834 | |
ae6ddcc5 | 835 | /* |
1da177e4 LT |
836 | * Function declarations for the journaling transaction and buffer |
837 | * management | |
838 | */ | |
839 | ||
840 | /* Filing buffers */ | |
1da177e4 LT |
841 | extern void journal_unfile_buffer(journal_t *, struct journal_head *); |
842 | extern void __journal_unfile_buffer(struct journal_head *); | |
843 | extern void __journal_refile_buffer(struct journal_head *); | |
844 | extern void journal_refile_buffer(journal_t *, struct journal_head *); | |
845 | extern void __journal_file_buffer(struct journal_head *, transaction_t *, int); | |
846 | extern void __journal_free_buffer(struct journal_head *bh); | |
847 | extern void journal_file_buffer(struct journal_head *, transaction_t *, int); | |
848 | extern void __journal_clean_data_list(transaction_t *transaction); | |
849 | ||
850 | /* Log buffer allocation */ | |
851 | extern struct journal_head * journal_get_descriptor_buffer(journal_t *); | |
9c28cbcc | 852 | int journal_next_log_block(journal_t *, unsigned int *); |
1da177e4 LT |
853 | |
854 | /* Commit management */ | |
855 | extern void journal_commit_transaction(journal_t *); | |
856 | ||
857 | /* Checkpoint list management */ | |
858 | int __journal_clean_checkpoint_list(journal_t *journal); | |
78ce89c9 | 859 | int __journal_remove_checkpoint(struct journal_head *); |
1da177e4 LT |
860 | void __journal_insert_checkpoint(struct journal_head *, transaction_t *); |
861 | ||
862 | /* Buffer IO */ | |
ae6ddcc5 | 863 | extern int |
1da177e4 LT |
864 | journal_write_metadata_buffer(transaction_t *transaction, |
865 | struct journal_head *jh_in, | |
866 | struct journal_head **jh_out, | |
9c28cbcc | 867 | unsigned int blocknr); |
1da177e4 LT |
868 | |
869 | /* Transaction locking */ | |
870 | extern void __wait_on_journal (journal_t *); | |
871 | ||
872 | /* | |
873 | * Journal locking. | |
874 | * | |
875 | * We need to lock the journal during transaction state changes so that nobody | |
876 | * ever tries to take a handle on the running transaction while we are in the | |
877 | * middle of moving it to the commit phase. j_state_lock does this. | |
878 | * | |
879 | * Note that the locking is completely interrupt unsafe. We never touch | |
880 | * journal structures from interrupts. | |
881 | */ | |
882 | ||
883 | static inline handle_t *journal_current_handle(void) | |
884 | { | |
885 | return current->journal_info; | |
886 | } | |
887 | ||
888 | /* The journaling code user interface: | |
889 | * | |
890 | * Create and destroy handles | |
ae6ddcc5 | 891 | * Register buffer modifications against the current transaction. |
1da177e4 LT |
892 | */ |
893 | ||
894 | extern handle_t *journal_start(journal_t *, int nblocks); | |
895 | extern int journal_restart (handle_t *, int nblocks); | |
896 | extern int journal_extend (handle_t *, int nblocks); | |
897 | extern int journal_get_write_access(handle_t *, struct buffer_head *); | |
898 | extern int journal_get_create_access (handle_t *, struct buffer_head *); | |
899 | extern int journal_get_undo_access(handle_t *, struct buffer_head *); | |
900 | extern int journal_dirty_data (handle_t *, struct buffer_head *); | |
901 | extern int journal_dirty_metadata (handle_t *, struct buffer_head *); | |
902 | extern void journal_release_buffer (handle_t *, struct buffer_head *); | |
903 | extern int journal_forget (handle_t *, struct buffer_head *); | |
904 | extern void journal_sync_buffer (struct buffer_head *); | |
2ff28e22 | 905 | extern void journal_invalidatepage(journal_t *, |
1da177e4 | 906 | struct page *, unsigned long); |
27496a8c | 907 | extern int journal_try_to_free_buffers(journal_t *, struct page *, gfp_t); |
1da177e4 LT |
908 | extern int journal_stop(handle_t *); |
909 | extern int journal_flush (journal_t *); | |
910 | extern void journal_lock_updates (journal_t *); | |
911 | extern void journal_unlock_updates (journal_t *); | |
912 | ||
913 | extern journal_t * journal_init_dev(struct block_device *bdev, | |
914 | struct block_device *fs_dev, | |
915 | int start, int len, int bsize); | |
916 | extern journal_t * journal_init_inode (struct inode *); | |
917 | extern int journal_update_format (journal_t *); | |
ae6ddcc5 | 918 | extern int journal_check_used_features |
1da177e4 | 919 | (journal_t *, unsigned long, unsigned long, unsigned long); |
ae6ddcc5 | 920 | extern int journal_check_available_features |
1da177e4 | 921 | (journal_t *, unsigned long, unsigned long, unsigned long); |
ae6ddcc5 | 922 | extern int journal_set_features |
1da177e4 LT |
923 | (journal_t *, unsigned long, unsigned long, unsigned long); |
924 | extern int journal_create (journal_t *); | |
925 | extern int journal_load (journal_t *journal); | |
4afe9785 | 926 | extern int journal_destroy (journal_t *); |
1da177e4 LT |
927 | extern int journal_recover (journal_t *journal); |
928 | extern int journal_wipe (journal_t *, int); | |
929 | extern int journal_skip_recovery (journal_t *); | |
930 | extern void journal_update_superblock (journal_t *, int); | |
1da177e4 LT |
931 | extern void journal_abort (journal_t *, int); |
932 | extern int journal_errno (journal_t *); | |
933 | extern void journal_ack_err (journal_t *); | |
934 | extern int journal_clear_err (journal_t *); | |
9c28cbcc | 935 | extern int journal_bmap(journal_t *, unsigned int, unsigned int *); |
1da177e4 LT |
936 | extern int journal_force_commit(journal_t *); |
937 | ||
938 | /* | |
939 | * journal_head management | |
940 | */ | |
941 | struct journal_head *journal_add_journal_head(struct buffer_head *bh); | |
942 | struct journal_head *journal_grab_journal_head(struct buffer_head *bh); | |
943 | void journal_remove_journal_head(struct buffer_head *bh); | |
944 | void journal_put_journal_head(struct journal_head *jh); | |
945 | ||
946 | /* | |
947 | * handle management | |
948 | */ | |
e18b890b | 949 | extern struct kmem_cache *jbd_handle_cache; |
1da177e4 | 950 | |
dd0fc66f | 951 | static inline handle_t *jbd_alloc_handle(gfp_t gfp_flags) |
1da177e4 LT |
952 | { |
953 | return kmem_cache_alloc(jbd_handle_cache, gfp_flags); | |
954 | } | |
955 | ||
956 | static inline void jbd_free_handle(handle_t *handle) | |
957 | { | |
958 | kmem_cache_free(jbd_handle_cache, handle); | |
959 | } | |
960 | ||
961 | /* Primary revoke support */ | |
962 | #define JOURNAL_REVOKE_DEFAULT_HASH 256 | |
963 | extern int journal_init_revoke(journal_t *, int); | |
964 | extern void journal_destroy_revoke_caches(void); | |
965 | extern int journal_init_revoke_caches(void); | |
966 | ||
967 | extern void journal_destroy_revoke(journal_t *); | |
968 | extern int journal_revoke (handle_t *, | |
9c28cbcc | 969 | unsigned int, struct buffer_head *); |
1da177e4 | 970 | extern int journal_cancel_revoke(handle_t *, struct journal_head *); |
38d726d1 TT |
971 | extern void journal_write_revoke_records(journal_t *, |
972 | transaction_t *, int); | |
1da177e4 LT |
973 | |
974 | /* Recovery revoke support */ | |
9c28cbcc JK |
975 | extern int journal_set_revoke(journal_t *, unsigned int, tid_t); |
976 | extern int journal_test_revoke(journal_t *, unsigned int, tid_t); | |
1da177e4 | 977 | extern void journal_clear_revoke(journal_t *); |
1da177e4 LT |
978 | extern void journal_switch_revoke_table(journal_t *journal); |
979 | ||
980 | /* | |
981 | * The log thread user interface: | |
982 | * | |
983 | * Request space in the current transaction, and force transaction commit | |
984 | * transitions on demand. | |
985 | */ | |
986 | ||
987 | int __log_space_left(journal_t *); /* Called with journal locked */ | |
988 | int log_start_commit(journal_t *journal, tid_t tid); | |
989 | int __log_start_commit(journal_t *journal, tid_t tid); | |
990 | int journal_start_commit(journal_t *journal, tid_t *tid); | |
991 | int journal_force_commit_nested(journal_t *journal); | |
992 | int log_wait_commit(journal_t *journal, tid_t tid); | |
993 | int log_do_checkpoint(journal_t *journal); | |
03f4d804 | 994 | int journal_trans_will_send_data_barrier(journal_t *journal, tid_t tid); |
1da177e4 LT |
995 | |
996 | void __log_wait_for_space(journal_t *journal); | |
997 | extern void __journal_drop_transaction(journal_t *, transaction_t *); | |
998 | extern int cleanup_journal_tail(journal_t *); | |
999 | ||
1000 | /* Debugging code only: */ | |
1001 | ||
1002 | #define jbd_ENOSYS() \ | |
1003 | do { \ | |
d5c003b4 | 1004 | printk (KERN_ERR "JBD unimplemented function %s\n", __func__); \ |
1da177e4 LT |
1005 | current->state = TASK_UNINTERRUPTIBLE; \ |
1006 | schedule(); \ | |
1007 | } while (1) | |
1008 | ||
1009 | /* | |
1010 | * is_journal_abort | |
1011 | * | |
1012 | * Simple test wrapper function to test the JFS_ABORT state flag. This | |
1013 | * bit, when set, indicates that we have had a fatal error somewhere, | |
1014 | * either inside the journaling layer or indicated to us by the client | |
1015 | * (eg. ext3), and that we and should not commit any further | |
ae6ddcc5 | 1016 | * transactions. |
1da177e4 LT |
1017 | */ |
1018 | ||
1019 | static inline int is_journal_aborted(journal_t *journal) | |
1020 | { | |
1021 | return journal->j_flags & JFS_ABORT; | |
1022 | } | |
1023 | ||
1024 | static inline int is_handle_aborted(handle_t *handle) | |
1025 | { | |
1026 | if (handle->h_aborted) | |
1027 | return 1; | |
1028 | return is_journal_aborted(handle->h_transaction->t_journal); | |
1029 | } | |
1030 | ||
1031 | static inline void journal_abort_handle(handle_t *handle) | |
1032 | { | |
1033 | handle->h_aborted = 1; | |
1034 | } | |
1035 | ||
1036 | #endif /* __KERNEL__ */ | |
1037 | ||
1038 | /* Comparison functions for transaction IDs: perform comparisons using | |
1039 | * modulo arithmetic so that they work over sequence number wraps. */ | |
1040 | ||
1041 | static inline int tid_gt(tid_t x, tid_t y) | |
1042 | { | |
1043 | int difference = (x - y); | |
1044 | return (difference > 0); | |
1045 | } | |
1046 | ||
1047 | static inline int tid_geq(tid_t x, tid_t y) | |
1048 | { | |
1049 | int difference = (x - y); | |
1050 | return (difference >= 0); | |
1051 | } | |
1052 | ||
1053 | extern int journal_blocks_per_page(struct inode *inode); | |
1054 | ||
1055 | /* | |
1056 | * Return the minimum number of blocks which must be free in the journal | |
1057 | * before a new transaction may be started. Must be called under j_state_lock. | |
1058 | */ | |
1059 | static inline int jbd_space_needed(journal_t *journal) | |
1060 | { | |
1061 | int nblocks = journal->j_max_transaction_buffers; | |
1062 | if (journal->j_committing_transaction) | |
1063 | nblocks += journal->j_committing_transaction-> | |
1064 | t_outstanding_credits; | |
1065 | return nblocks; | |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * Definitions which augment the buffer_head layer | |
1070 | */ | |
1071 | ||
1072 | /* journaling buffer types */ | |
1073 | #define BJ_None 0 /* Not journaled */ | |
1074 | #define BJ_SyncData 1 /* Normal data: flush before commit */ | |
1075 | #define BJ_Metadata 2 /* Normal journaled metadata */ | |
1076 | #define BJ_Forget 3 /* Buffer superseded by this transaction */ | |
1077 | #define BJ_IO 4 /* Buffer is for temporary IO use */ | |
1078 | #define BJ_Shadow 5 /* Buffer contents being shadowed to the log */ | |
1079 | #define BJ_LogCtl 6 /* Buffer contains log descriptors */ | |
1080 | #define BJ_Reserved 7 /* Buffer is reserved for access by journal */ | |
1081 | #define BJ_Locked 8 /* Locked for I/O during commit */ | |
1082 | #define BJ_Types 9 | |
ae6ddcc5 | 1083 | |
1da177e4 LT |
1084 | extern int jbd_blocks_per_page(struct inode *inode); |
1085 | ||
1086 | #ifdef __KERNEL__ | |
1087 | ||
1088 | #define buffer_trace_init(bh) do {} while (0) | |
1089 | #define print_buffer_fields(bh) do {} while (0) | |
1090 | #define print_buffer_trace(bh) do {} while (0) | |
1091 | #define BUFFER_TRACE(bh, info) do {} while (0) | |
1092 | #define BUFFER_TRACE2(bh, bh2, info) do {} while (0) | |
1093 | #define JBUFFER_TRACE(jh, info) do {} while (0) | |
1094 | ||
1095 | #endif /* __KERNEL__ */ | |
1096 | ||
1da177e4 | 1097 | #endif /* _LINUX_JBD_H */ |