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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> | |
2c68ee75 | 30 | #include <linux/mutex.h> |
e3df1898 | 31 | #include <linux/timer.h> |
34a3d1e8 | 32 | #include <linux/lockdep.h> |
5a0e3ad6 | 33 | #include <linux/slab.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> | |
b34090e5 JK |
246 | |
247 | enum jbd_state_bits { | |
248 | BH_JBD /* Has an attached ext3 journal_head */ | |
249 | = BH_PrivateStart, | |
250 | BH_JWrite, /* Being written to log (@@@ DEBUGGING) */ | |
251 | BH_Freed, /* Has been freed (truncated) */ | |
252 | BH_Revoked, /* Has been revoked from the log */ | |
253 | BH_RevokeValid, /* Revoked flag is valid */ | |
254 | BH_JBDDirty, /* Is dirty but journaled */ | |
255 | BH_State, /* Pins most journal_head state */ | |
256 | BH_JournalHead, /* Pins bh->b_private and jh->b_bh */ | |
257 | BH_Unshadow, /* Dummy bit, for BJ_Shadow wakeup filtering */ | |
258 | BH_JBDPrivateStart, /* First bit available for private use by FS */ | |
259 | }; | |
260 | ||
261 | BUFFER_FNS(JBD, jbd) | |
262 | BUFFER_FNS(JWrite, jwrite) | |
263 | BUFFER_FNS(JBDDirty, jbddirty) | |
264 | TAS_BUFFER_FNS(JBDDirty, jbddirty) | |
265 | BUFFER_FNS(Revoked, revoked) | |
266 | TAS_BUFFER_FNS(Revoked, revoked) | |
267 | BUFFER_FNS(RevokeValid, revokevalid) | |
268 | TAS_BUFFER_FNS(RevokeValid, revokevalid) | |
269 | BUFFER_FNS(Freed, freed) | |
270 | ||
44606672 | 271 | #include <linux/jbd_common.h> |
1da177e4 | 272 | |
1c099244 | 273 | #define J_ASSERT(assert) BUG_ON(!(assert)) |
1da177e4 | 274 | |
1da177e4 LT |
275 | #define J_ASSERT_BH(bh, expr) J_ASSERT(expr) |
276 | #define J_ASSERT_JH(jh, expr) J_ASSERT(expr) | |
1da177e4 | 277 | |
1da177e4 LT |
278 | #if defined(JBD_PARANOID_IOFAIL) |
279 | #define J_EXPECT(expr, why...) J_ASSERT(expr) | |
280 | #define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr) | |
281 | #define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr) | |
282 | #else | |
283 | #define __journal_expect(expr, why...) \ | |
284 | ({ \ | |
285 | int val = (expr); \ | |
286 | if (!val) { \ | |
287 | printk(KERN_ERR \ | |
288 | "EXT3-fs unexpected failure: %s;\n",# expr); \ | |
289 | printk(KERN_ERR why "\n"); \ | |
290 | } \ | |
291 | val; \ | |
292 | }) | |
293 | #define J_EXPECT(expr, why...) __journal_expect(expr, ## why) | |
294 | #define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why) | |
295 | #define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why) | |
296 | #endif | |
297 | ||
1da177e4 LT |
298 | struct jbd_revoke_table_s; |
299 | ||
300 | /** | |
a6b91919 | 301 | * struct handle_s - this is the concrete type associated with handle_t. |
1da177e4 LT |
302 | * @h_transaction: Which compound transaction is this update a part of? |
303 | * @h_buffer_credits: Number of remaining buffers we are allowed to dirty. | |
304 | * @h_ref: Reference count on this handle | |
305 | * @h_err: Field for caller's use to track errors through large fs operations | |
306 | * @h_sync: flag for sync-on-close | |
307 | * @h_jdata: flag to force data journaling | |
308 | * @h_aborted: flag indicating fatal error on handle | |
e6716b87 | 309 | * @h_lockdep_map: lockdep info for debugging lock problems |
1da177e4 | 310 | */ |
ae6ddcc5 | 311 | struct handle_s |
1da177e4 LT |
312 | { |
313 | /* Which compound transaction is this update a part of? */ | |
314 | transaction_t *h_transaction; | |
315 | ||
316 | /* Number of remaining buffers we are allowed to dirty: */ | |
317 | int h_buffer_credits; | |
318 | ||
319 | /* Reference count on this handle */ | |
320 | int h_ref; | |
321 | ||
322 | /* Field for caller's use to track errors through large fs */ | |
323 | /* operations */ | |
324 | int h_err; | |
325 | ||
326 | /* Flags [no locking] */ | |
327 | unsigned int h_sync: 1; /* sync-on-close */ | |
328 | unsigned int h_jdata: 1; /* force data journaling */ | |
329 | unsigned int h_aborted: 1; /* fatal error on handle */ | |
34a3d1e8 PZ |
330 | |
331 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
332 | struct lockdep_map h_lockdep_map; | |
333 | #endif | |
1da177e4 LT |
334 | }; |
335 | ||
336 | ||
337 | /* The transaction_t type is the guts of the journaling mechanism. It | |
338 | * tracks a compound transaction through its various states: | |
339 | * | |
340 | * RUNNING: accepting new updates | |
341 | * LOCKED: Updates still running but we don't accept new ones | |
342 | * RUNDOWN: Updates are tidying up but have finished requesting | |
343 | * new buffers to modify (state not used for now) | |
344 | * FLUSH: All updates complete, but we are still writing to disk | |
345 | * COMMIT: All data on disk, writing commit record | |
346 | * FINISHED: We still have to keep the transaction for checkpointing. | |
347 | * | |
348 | * The transaction keeps track of all of the buffers modified by a | |
349 | * running transaction, and all of the buffers committed but not yet | |
350 | * flushed to home for finished transactions. | |
351 | */ | |
352 | ||
353 | /* | |
354 | * Lock ranking: | |
355 | * | |
356 | * j_list_lock | |
357 | * ->jbd_lock_bh_journal_head() (This is "innermost") | |
358 | * | |
359 | * j_state_lock | |
360 | * ->jbd_lock_bh_state() | |
361 | * | |
362 | * jbd_lock_bh_state() | |
363 | * ->j_list_lock | |
364 | * | |
365 | * j_state_lock | |
366 | * ->t_handle_lock | |
367 | * | |
368 | * j_state_lock | |
369 | * ->j_list_lock (journal_unmap_buffer) | |
370 | * | |
371 | */ | |
372 | ||
ae6ddcc5 | 373 | struct transaction_s |
1da177e4 LT |
374 | { |
375 | /* Pointer to the journal for this transaction. [no locking] */ | |
376 | journal_t *t_journal; | |
377 | ||
378 | /* Sequence number for this transaction [no locking] */ | |
379 | tid_t t_tid; | |
380 | ||
381 | /* | |
382 | * Transaction's current state | |
383 | * [no locking - only kjournald alters this] | |
d4beaf4a JK |
384 | * [j_list_lock] guards transition of a transaction into T_FINISHED |
385 | * state and subsequent call of __journal_drop_transaction() | |
1da177e4 LT |
386 | * FIXME: needs barriers |
387 | * KLUDGE: [use j_state_lock] | |
388 | */ | |
389 | enum { | |
390 | T_RUNNING, | |
391 | T_LOCKED, | |
1da177e4 LT |
392 | T_FLUSH, |
393 | T_COMMIT, | |
03f4d804 | 394 | T_COMMIT_RECORD, |
ae6ddcc5 | 395 | T_FINISHED |
1da177e4 LT |
396 | } t_state; |
397 | ||
398 | /* | |
399 | * Where in the log does this transaction's commit start? [no locking] | |
400 | */ | |
9c28cbcc | 401 | unsigned int t_log_start; |
1da177e4 LT |
402 | |
403 | /* Number of buffers on the t_buffers list [j_list_lock] */ | |
404 | int t_nr_buffers; | |
405 | ||
406 | /* | |
407 | * Doubly-linked circular list of all buffers reserved but not yet | |
408 | * modified by this transaction [j_list_lock] | |
409 | */ | |
410 | struct journal_head *t_reserved_list; | |
411 | ||
412 | /* | |
413 | * Doubly-linked circular list of all buffers under writeout during | |
414 | * commit [j_list_lock] | |
415 | */ | |
416 | struct journal_head *t_locked_list; | |
417 | ||
418 | /* | |
419 | * Doubly-linked circular list of all metadata buffers owned by this | |
420 | * transaction [j_list_lock] | |
421 | */ | |
422 | struct journal_head *t_buffers; | |
423 | ||
424 | /* | |
425 | * Doubly-linked circular list of all data buffers still to be | |
426 | * flushed before this transaction can be committed [j_list_lock] | |
427 | */ | |
428 | struct journal_head *t_sync_datalist; | |
429 | ||
430 | /* | |
431 | * Doubly-linked circular list of all forget buffers (superseded | |
432 | * buffers which we can un-checkpoint once this transaction commits) | |
433 | * [j_list_lock] | |
434 | */ | |
435 | struct journal_head *t_forget; | |
436 | ||
437 | /* | |
438 | * Doubly-linked circular list of all buffers still to be flushed before | |
439 | * this transaction can be checkpointed. [j_list_lock] | |
440 | */ | |
441 | struct journal_head *t_checkpoint_list; | |
442 | ||
78ce89c9 JK |
443 | /* |
444 | * Doubly-linked circular list of all buffers submitted for IO while | |
445 | * checkpointing. [j_list_lock] | |
446 | */ | |
447 | struct journal_head *t_checkpoint_io_list; | |
448 | ||
1da177e4 LT |
449 | /* |
450 | * Doubly-linked circular list of temporary buffers currently undergoing | |
451 | * IO in the log [j_list_lock] | |
452 | */ | |
453 | struct journal_head *t_iobuf_list; | |
454 | ||
455 | /* | |
456 | * Doubly-linked circular list of metadata buffers being shadowed by log | |
457 | * IO. The IO buffers on the iobuf list and the shadow buffers on this | |
458 | * list match each other one for one at all times. [j_list_lock] | |
459 | */ | |
460 | struct journal_head *t_shadow_list; | |
461 | ||
462 | /* | |
463 | * Doubly-linked circular list of control buffers being written to the | |
464 | * log. [j_list_lock] | |
465 | */ | |
466 | struct journal_head *t_log_list; | |
467 | ||
468 | /* | |
469 | * Protects info related to handles | |
470 | */ | |
471 | spinlock_t t_handle_lock; | |
472 | ||
473 | /* | |
474 | * Number of outstanding updates running on this transaction | |
475 | * [t_handle_lock] | |
476 | */ | |
477 | int t_updates; | |
478 | ||
479 | /* | |
480 | * Number of buffers reserved for use by all handles in this transaction | |
481 | * handle but not yet modified. [t_handle_lock] | |
482 | */ | |
483 | int t_outstanding_credits; | |
484 | ||
485 | /* | |
486 | * Forward and backward links for the circular list of all transactions | |
487 | * awaiting checkpoint. [j_list_lock] | |
488 | */ | |
489 | transaction_t *t_cpnext, *t_cpprev; | |
490 | ||
491 | /* | |
492 | * When will the transaction expire (become due for commit), in jiffies? | |
493 | * [no locking] | |
494 | */ | |
495 | unsigned long t_expires; | |
496 | ||
f420d4dc JB |
497 | /* |
498 | * When this transaction started, in nanoseconds [no locking] | |
499 | */ | |
500 | ktime_t t_start_time; | |
501 | ||
1da177e4 LT |
502 | /* |
503 | * How many handles used this transaction? [t_handle_lock] | |
504 | */ | |
505 | int t_handle_count; | |
1da177e4 LT |
506 | }; |
507 | ||
508 | /** | |
a6b91919 | 509 | * struct journal_s - this is the concrete type associated with journal_t. |
1da177e4 LT |
510 | * @j_flags: General journaling state flags |
511 | * @j_errno: Is there an outstanding uncleared error on the journal (from a | |
ae6ddcc5 | 512 | * prior abort)? |
1da177e4 LT |
513 | * @j_sb_buffer: First part of superblock buffer |
514 | * @j_superblock: Second part of superblock buffer | |
515 | * @j_format_version: Version of the superblock format | |
516 | * @j_state_lock: Protect the various scalars in the journal | |
517 | * @j_barrier_count: Number of processes waiting to create a barrier lock | |
1da177e4 LT |
518 | * @j_running_transaction: The current running transaction.. |
519 | * @j_committing_transaction: the transaction we are pushing to disk | |
520 | * @j_checkpoint_transactions: a linked circular list of all transactions | |
521 | * waiting for checkpointing | |
522 | * @j_wait_transaction_locked: Wait queue for waiting for a locked transaction | |
523 | * to start committing, or for a barrier lock to be released | |
524 | * @j_wait_logspace: Wait queue for waiting for checkpointing to complete | |
ae6ddcc5 | 525 | * @j_wait_done_commit: Wait queue for waiting for commit to complete |
1da177e4 LT |
526 | * @j_wait_checkpoint: Wait queue to trigger checkpointing |
527 | * @j_wait_commit: Wait queue to trigger commit | |
528 | * @j_wait_updates: Wait queue to wait for updates to complete | |
2c68ee75 | 529 | * @j_checkpoint_mutex: Mutex for locking against concurrent checkpoints |
1da177e4 LT |
530 | * @j_head: Journal head - identifies the first unused block in the journal |
531 | * @j_tail: Journal tail - identifies the oldest still-used block in the | |
532 | * journal. | |
533 | * @j_free: Journal free - how many free blocks are there in the journal? | |
ae6ddcc5 | 534 | * @j_first: The block number of the first usable block |
1da177e4 LT |
535 | * @j_last: The block number one beyond the last usable block |
536 | * @j_dev: Device where we store the journal | |
537 | * @j_blocksize: blocksize for the location where we store the journal. | |
538 | * @j_blk_offset: starting block offset for into the device where we store the | |
539 | * journal | |
540 | * @j_fs_dev: Device which holds the client fs. For internal journal this will | |
541 | * be equal to j_dev | |
542 | * @j_maxlen: Total maximum capacity of the journal region on disk. | |
543 | * @j_list_lock: Protects the buffer lists and internal buffer state. | |
544 | * @j_inode: Optional inode where we store the journal. If present, all journal | |
545 | * block numbers are mapped into this inode via bmap(). | |
ae6ddcc5 | 546 | * @j_tail_sequence: Sequence number of the oldest transaction in the log |
1da177e4 LT |
547 | * @j_transaction_sequence: Sequence number of the next transaction to grant |
548 | * @j_commit_sequence: Sequence number of the most recently committed | |
549 | * transaction | |
550 | * @j_commit_request: Sequence number of the most recent transaction wanting | |
ae6ddcc5 | 551 | * commit |
2db938be JK |
552 | * @j_commit_waited: Sequence number of the most recent transaction someone |
553 | * is waiting for to commit. | |
1da177e4 LT |
554 | * @j_uuid: Uuid of client object. |
555 | * @j_task: Pointer to the current commit thread for this journal | |
556 | * @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a | |
557 | * single compound commit transaction | |
558 | * @j_commit_interval: What is the maximum transaction lifetime before we begin | |
559 | * a commit? | |
560 | * @j_commit_timer: The timer used to wakeup the commit thread | |
561 | * @j_revoke_lock: Protect the revoke table | |
562 | * @j_revoke: The revoke table - maintains the list of revoked blocks in the | |
563 | * current transaction. | |
564 | * @j_revoke_table: alternate revoke tables for j_revoke | |
6c8bec6d RD |
565 | * @j_wbuf: array of buffer_heads for journal_commit_transaction |
566 | * @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the | |
567 | * number that will fit in j_blocksize | |
fe1dcbc4 | 568 | * @j_last_sync_writer: most recent pid which did a synchronous write |
3eabdb76 RD |
569 | * @j_average_commit_time: the average amount of time in nanoseconds it |
570 | * takes to commit a transaction to the disk. | |
1da177e4 LT |
571 | * @j_private: An opaque pointer to fs-private information. |
572 | */ | |
573 | ||
574 | struct journal_s | |
575 | { | |
576 | /* General journaling state flags [j_state_lock] */ | |
577 | unsigned long j_flags; | |
578 | ||
579 | /* | |
580 | * Is there an outstanding uncleared error on the journal (from a prior | |
581 | * abort)? [j_state_lock] | |
582 | */ | |
583 | int j_errno; | |
584 | ||
585 | /* The superblock buffer */ | |
586 | struct buffer_head *j_sb_buffer; | |
587 | journal_superblock_t *j_superblock; | |
588 | ||
589 | /* Version of the superblock format */ | |
590 | int j_format_version; | |
591 | ||
592 | /* | |
593 | * Protect the various scalars in the journal | |
594 | */ | |
595 | spinlock_t j_state_lock; | |
596 | ||
597 | /* | |
598 | * Number of processes waiting to create a barrier lock [j_state_lock] | |
599 | */ | |
600 | int j_barrier_count; | |
601 | ||
1da177e4 LT |
602 | /* |
603 | * Transactions: The current running transaction... | |
604 | * [j_state_lock] [caller holding open handle] | |
605 | */ | |
606 | transaction_t *j_running_transaction; | |
607 | ||
608 | /* | |
609 | * the transaction we are pushing to disk | |
610 | * [j_state_lock] [caller holding open handle] | |
611 | */ | |
612 | transaction_t *j_committing_transaction; | |
613 | ||
614 | /* | |
615 | * ... and a linked circular list of all transactions waiting for | |
616 | * checkpointing. [j_list_lock] | |
617 | */ | |
618 | transaction_t *j_checkpoint_transactions; | |
619 | ||
620 | /* | |
621 | * Wait queue for waiting for a locked transaction to start committing, | |
622 | * or for a barrier lock to be released | |
623 | */ | |
624 | wait_queue_head_t j_wait_transaction_locked; | |
625 | ||
626 | /* Wait queue for waiting for checkpointing to complete */ | |
627 | wait_queue_head_t j_wait_logspace; | |
628 | ||
629 | /* Wait queue for waiting for commit to complete */ | |
630 | wait_queue_head_t j_wait_done_commit; | |
631 | ||
632 | /* Wait queue to trigger checkpointing */ | |
633 | wait_queue_head_t j_wait_checkpoint; | |
634 | ||
635 | /* Wait queue to trigger commit */ | |
636 | wait_queue_head_t j_wait_commit; | |
637 | ||
638 | /* Wait queue to wait for updates to complete */ | |
639 | wait_queue_head_t j_wait_updates; | |
640 | ||
641 | /* Semaphore for locking against concurrent checkpoints */ | |
e9ad5620 | 642 | struct mutex j_checkpoint_mutex; |
1da177e4 LT |
643 | |
644 | /* | |
645 | * Journal head: identifies the first unused block in the journal. | |
646 | * [j_state_lock] | |
647 | */ | |
9c28cbcc | 648 | unsigned int j_head; |
1da177e4 LT |
649 | |
650 | /* | |
651 | * Journal tail: identifies the oldest still-used block in the journal. | |
652 | * [j_state_lock] | |
653 | */ | |
9c28cbcc | 654 | unsigned int j_tail; |
1da177e4 LT |
655 | |
656 | /* | |
657 | * Journal free: how many free blocks are there in the journal? | |
658 | * [j_state_lock] | |
659 | */ | |
9c28cbcc | 660 | unsigned int j_free; |
1da177e4 LT |
661 | |
662 | /* | |
663 | * Journal start and end: the block numbers of the first usable block | |
664 | * and one beyond the last usable block in the journal. [j_state_lock] | |
665 | */ | |
9c28cbcc JK |
666 | unsigned int j_first; |
667 | unsigned int j_last; | |
1da177e4 LT |
668 | |
669 | /* | |
670 | * Device, blocksize and starting block offset for the location where we | |
671 | * store the journal. | |
672 | */ | |
673 | struct block_device *j_dev; | |
674 | int j_blocksize; | |
9c28cbcc | 675 | unsigned int j_blk_offset; |
1da177e4 LT |
676 | |
677 | /* | |
678 | * Device which holds the client fs. For internal journal this will be | |
679 | * equal to j_dev. | |
680 | */ | |
681 | struct block_device *j_fs_dev; | |
682 | ||
683 | /* Total maximum capacity of the journal region on disk. */ | |
684 | unsigned int j_maxlen; | |
685 | ||
686 | /* | |
687 | * Protects the buffer lists and internal buffer state. | |
688 | */ | |
689 | spinlock_t j_list_lock; | |
690 | ||
691 | /* Optional inode where we store the journal. If present, all */ | |
692 | /* journal block numbers are mapped into this inode via */ | |
693 | /* bmap(). */ | |
694 | struct inode *j_inode; | |
695 | ||
696 | /* | |
697 | * Sequence number of the oldest transaction in the log [j_state_lock] | |
698 | */ | |
699 | tid_t j_tail_sequence; | |
700 | ||
701 | /* | |
702 | * Sequence number of the next transaction to grant [j_state_lock] | |
703 | */ | |
704 | tid_t j_transaction_sequence; | |
705 | ||
706 | /* | |
707 | * Sequence number of the most recently committed transaction | |
708 | * [j_state_lock]. | |
709 | */ | |
710 | tid_t j_commit_sequence; | |
711 | ||
712 | /* | |
713 | * Sequence number of the most recent transaction wanting commit | |
714 | * [j_state_lock] | |
715 | */ | |
716 | tid_t j_commit_request; | |
717 | ||
2db938be JK |
718 | /* |
719 | * Sequence number of the most recent transaction someone is waiting | |
720 | * for to commit. | |
721 | * [j_state_lock] | |
722 | */ | |
723 | tid_t j_commit_waited; | |
724 | ||
1da177e4 LT |
725 | /* |
726 | * Journal uuid: identifies the object (filesystem, LVM volume etc) | |
727 | * backed by this journal. This will eventually be replaced by an array | |
728 | * of uuids, allowing us to index multiple devices within a single | |
729 | * journal and to perform atomic updates across them. | |
730 | */ | |
731 | __u8 j_uuid[16]; | |
732 | ||
733 | /* Pointer to the current commit thread for this journal */ | |
734 | struct task_struct *j_task; | |
735 | ||
736 | /* | |
737 | * Maximum number of metadata buffers to allow in a single compound | |
738 | * commit transaction | |
739 | */ | |
740 | int j_max_transaction_buffers; | |
741 | ||
742 | /* | |
743 | * What is the maximum transaction lifetime before we begin a commit? | |
744 | */ | |
745 | unsigned long j_commit_interval; | |
746 | ||
747 | /* The timer used to wakeup the commit thread: */ | |
e3df1898 | 748 | struct timer_list j_commit_timer; |
1da177e4 LT |
749 | |
750 | /* | |
751 | * The revoke table: maintains the list of revoked blocks in the | |
752 | * current transaction. [j_revoke_lock] | |
753 | */ | |
754 | spinlock_t j_revoke_lock; | |
755 | struct jbd_revoke_table_s *j_revoke; | |
756 | struct jbd_revoke_table_s *j_revoke_table[2]; | |
757 | ||
758 | /* | |
759 | * array of bhs for journal_commit_transaction | |
760 | */ | |
761 | struct buffer_head **j_wbuf; | |
762 | int j_wbufsize; | |
763 | ||
f420d4dc JB |
764 | /* |
765 | * this is the pid of the last person to run a synchronous operation | |
766 | * through the journal. | |
767 | */ | |
fe1dcbc4 AM |
768 | pid_t j_last_sync_writer; |
769 | ||
f420d4dc JB |
770 | /* |
771 | * the average amount of time in nanoseconds it takes to commit a | |
772 | * transaction to the disk. [j_state_lock] | |
773 | */ | |
774 | u64 j_average_commit_time; | |
775 | ||
1da177e4 LT |
776 | /* |
777 | * An opaque pointer to fs-private information. ext3 puts its | |
778 | * superblock pointer here | |
779 | */ | |
780 | void *j_private; | |
781 | }; | |
782 | ||
ae6ddcc5 MC |
783 | /* |
784 | * Journal flag definitions | |
1da177e4 LT |
785 | */ |
786 | #define JFS_UNMOUNT 0x001 /* Journal thread is being destroyed */ | |
787 | #define JFS_ABORT 0x002 /* Journaling has been aborted for errors. */ | |
788 | #define JFS_ACK_ERR 0x004 /* The errno in the sb has been acked */ | |
789 | #define JFS_FLUSHED 0x008 /* The journal superblock has been flushed */ | |
790 | #define JFS_LOADED 0x010 /* The journal superblock has been loaded */ | |
791 | #define JFS_BARRIER 0x020 /* Use IDE barriers */ | |
0e4fb5e2 HK |
792 | #define JFS_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file |
793 | * data write error in ordered | |
794 | * mode */ | |
1da177e4 | 795 | |
ae6ddcc5 | 796 | /* |
1da177e4 LT |
797 | * Function declarations for the journaling transaction and buffer |
798 | * management | |
799 | */ | |
800 | ||
801 | /* Filing buffers */ | |
1da177e4 LT |
802 | extern void journal_unfile_buffer(journal_t *, struct journal_head *); |
803 | extern void __journal_unfile_buffer(struct journal_head *); | |
804 | extern void __journal_refile_buffer(struct journal_head *); | |
805 | extern void journal_refile_buffer(journal_t *, struct journal_head *); | |
806 | extern void __journal_file_buffer(struct journal_head *, transaction_t *, int); | |
807 | extern void __journal_free_buffer(struct journal_head *bh); | |
808 | extern void journal_file_buffer(struct journal_head *, transaction_t *, int); | |
809 | extern void __journal_clean_data_list(transaction_t *transaction); | |
810 | ||
811 | /* Log buffer allocation */ | |
812 | extern struct journal_head * journal_get_descriptor_buffer(journal_t *); | |
9c28cbcc | 813 | int journal_next_log_block(journal_t *, unsigned int *); |
1da177e4 LT |
814 | |
815 | /* Commit management */ | |
816 | extern void journal_commit_transaction(journal_t *); | |
817 | ||
818 | /* Checkpoint list management */ | |
819 | int __journal_clean_checkpoint_list(journal_t *journal); | |
78ce89c9 | 820 | int __journal_remove_checkpoint(struct journal_head *); |
1da177e4 LT |
821 | void __journal_insert_checkpoint(struct journal_head *, transaction_t *); |
822 | ||
823 | /* Buffer IO */ | |
ae6ddcc5 | 824 | extern int |
1da177e4 LT |
825 | journal_write_metadata_buffer(transaction_t *transaction, |
826 | struct journal_head *jh_in, | |
827 | struct journal_head **jh_out, | |
9c28cbcc | 828 | unsigned int blocknr); |
1da177e4 LT |
829 | |
830 | /* Transaction locking */ | |
831 | extern void __wait_on_journal (journal_t *); | |
832 | ||
833 | /* | |
834 | * Journal locking. | |
835 | * | |
836 | * We need to lock the journal during transaction state changes so that nobody | |
837 | * ever tries to take a handle on the running transaction while we are in the | |
838 | * middle of moving it to the commit phase. j_state_lock does this. | |
839 | * | |
840 | * Note that the locking is completely interrupt unsafe. We never touch | |
841 | * journal structures from interrupts. | |
842 | */ | |
843 | ||
844 | static inline handle_t *journal_current_handle(void) | |
845 | { | |
846 | return current->journal_info; | |
847 | } | |
848 | ||
849 | /* The journaling code user interface: | |
850 | * | |
851 | * Create and destroy handles | |
ae6ddcc5 | 852 | * Register buffer modifications against the current transaction. |
1da177e4 LT |
853 | */ |
854 | ||
855 | extern handle_t *journal_start(journal_t *, int nblocks); | |
856 | extern int journal_restart (handle_t *, int nblocks); | |
857 | extern int journal_extend (handle_t *, int nblocks); | |
858 | extern int journal_get_write_access(handle_t *, struct buffer_head *); | |
859 | extern int journal_get_create_access (handle_t *, struct buffer_head *); | |
860 | extern int journal_get_undo_access(handle_t *, struct buffer_head *); | |
861 | extern int journal_dirty_data (handle_t *, struct buffer_head *); | |
862 | extern int journal_dirty_metadata (handle_t *, struct buffer_head *); | |
863 | extern void journal_release_buffer (handle_t *, struct buffer_head *); | |
864 | extern int journal_forget (handle_t *, struct buffer_head *); | |
865 | extern void journal_sync_buffer (struct buffer_head *); | |
2ff28e22 | 866 | extern void journal_invalidatepage(journal_t *, |
d8c8900a | 867 | struct page *, unsigned int, unsigned int); |
27496a8c | 868 | extern int journal_try_to_free_buffers(journal_t *, struct page *, gfp_t); |
1da177e4 LT |
869 | extern int journal_stop(handle_t *); |
870 | extern int journal_flush (journal_t *); | |
871 | extern void journal_lock_updates (journal_t *); | |
872 | extern void journal_unlock_updates (journal_t *); | |
873 | ||
874 | extern journal_t * journal_init_dev(struct block_device *bdev, | |
875 | struct block_device *fs_dev, | |
876 | int start, int len, int bsize); | |
877 | extern journal_t * journal_init_inode (struct inode *); | |
878 | extern int journal_update_format (journal_t *); | |
ae6ddcc5 | 879 | extern int journal_check_used_features |
1da177e4 | 880 | (journal_t *, unsigned long, unsigned long, unsigned long); |
ae6ddcc5 | 881 | extern int journal_check_available_features |
1da177e4 | 882 | (journal_t *, unsigned long, unsigned long, unsigned long); |
ae6ddcc5 | 883 | extern int journal_set_features |
1da177e4 LT |
884 | (journal_t *, unsigned long, unsigned long, unsigned long); |
885 | extern int journal_create (journal_t *); | |
886 | extern int journal_load (journal_t *journal); | |
4afe9785 | 887 | extern int journal_destroy (journal_t *); |
1da177e4 LT |
888 | extern int journal_recover (journal_t *journal); |
889 | extern int journal_wipe (journal_t *, int); | |
890 | extern int journal_skip_recovery (journal_t *); | |
fd2cbd4d JK |
891 | extern void journal_update_sb_log_tail (journal_t *, tid_t, unsigned int, |
892 | int); | |
1da177e4 LT |
893 | extern void journal_abort (journal_t *, int); |
894 | extern int journal_errno (journal_t *); | |
895 | extern void journal_ack_err (journal_t *); | |
896 | extern int journal_clear_err (journal_t *); | |
9c28cbcc | 897 | extern int journal_bmap(journal_t *, unsigned int, unsigned int *); |
1da177e4 LT |
898 | extern int journal_force_commit(journal_t *); |
899 | ||
900 | /* | |
901 | * journal_head management | |
902 | */ | |
903 | struct journal_head *journal_add_journal_head(struct buffer_head *bh); | |
904 | struct journal_head *journal_grab_journal_head(struct buffer_head *bh); | |
1da177e4 LT |
905 | void journal_put_journal_head(struct journal_head *jh); |
906 | ||
907 | /* | |
908 | * handle management | |
909 | */ | |
e18b890b | 910 | extern struct kmem_cache *jbd_handle_cache; |
1da177e4 | 911 | |
dd0fc66f | 912 | static inline handle_t *jbd_alloc_handle(gfp_t gfp_flags) |
1da177e4 | 913 | { |
e162b2f8 | 914 | return kmem_cache_zalloc(jbd_handle_cache, gfp_flags); |
1da177e4 LT |
915 | } |
916 | ||
917 | static inline void jbd_free_handle(handle_t *handle) | |
918 | { | |
919 | kmem_cache_free(jbd_handle_cache, handle); | |
920 | } | |
921 | ||
922 | /* Primary revoke support */ | |
923 | #define JOURNAL_REVOKE_DEFAULT_HASH 256 | |
924 | extern int journal_init_revoke(journal_t *, int); | |
925 | extern void journal_destroy_revoke_caches(void); | |
926 | extern int journal_init_revoke_caches(void); | |
927 | ||
928 | extern void journal_destroy_revoke(journal_t *); | |
929 | extern int journal_revoke (handle_t *, | |
9c28cbcc | 930 | unsigned int, struct buffer_head *); |
1da177e4 | 931 | extern int journal_cancel_revoke(handle_t *, struct journal_head *); |
38d726d1 TT |
932 | extern void journal_write_revoke_records(journal_t *, |
933 | transaction_t *, int); | |
1da177e4 LT |
934 | |
935 | /* Recovery revoke support */ | |
9c28cbcc JK |
936 | extern int journal_set_revoke(journal_t *, unsigned int, tid_t); |
937 | extern int journal_test_revoke(journal_t *, unsigned int, tid_t); | |
1da177e4 | 938 | extern void journal_clear_revoke(journal_t *); |
1da177e4 | 939 | extern void journal_switch_revoke_table(journal_t *journal); |
8c111b3f | 940 | extern void journal_clear_buffer_revoked_flags(journal_t *journal); |
1da177e4 LT |
941 | |
942 | /* | |
943 | * The log thread user interface: | |
944 | * | |
945 | * Request space in the current transaction, and force transaction commit | |
946 | * transitions on demand. | |
947 | */ | |
948 | ||
949 | int __log_space_left(journal_t *); /* Called with journal locked */ | |
950 | int log_start_commit(journal_t *journal, tid_t tid); | |
951 | int __log_start_commit(journal_t *journal, tid_t tid); | |
952 | int journal_start_commit(journal_t *journal, tid_t *tid); | |
953 | int journal_force_commit_nested(journal_t *journal); | |
954 | int log_wait_commit(journal_t *journal, tid_t tid); | |
955 | int log_do_checkpoint(journal_t *journal); | |
03f4d804 | 956 | int journal_trans_will_send_data_barrier(journal_t *journal, tid_t tid); |
1da177e4 LT |
957 | |
958 | void __log_wait_for_space(journal_t *journal); | |
959 | extern void __journal_drop_transaction(journal_t *, transaction_t *); | |
960 | extern int cleanup_journal_tail(journal_t *); | |
961 | ||
962 | /* Debugging code only: */ | |
963 | ||
964 | #define jbd_ENOSYS() \ | |
965 | do { \ | |
d5c003b4 | 966 | printk (KERN_ERR "JBD unimplemented function %s\n", __func__); \ |
1da177e4 LT |
967 | current->state = TASK_UNINTERRUPTIBLE; \ |
968 | schedule(); \ | |
969 | } while (1) | |
970 | ||
971 | /* | |
972 | * is_journal_abort | |
973 | * | |
974 | * Simple test wrapper function to test the JFS_ABORT state flag. This | |
975 | * bit, when set, indicates that we have had a fatal error somewhere, | |
976 | * either inside the journaling layer or indicated to us by the client | |
977 | * (eg. ext3), and that we and should not commit any further | |
ae6ddcc5 | 978 | * transactions. |
1da177e4 LT |
979 | */ |
980 | ||
981 | static inline int is_journal_aborted(journal_t *journal) | |
982 | { | |
983 | return journal->j_flags & JFS_ABORT; | |
984 | } | |
985 | ||
986 | static inline int is_handle_aborted(handle_t *handle) | |
987 | { | |
988 | if (handle->h_aborted) | |
989 | return 1; | |
990 | return is_journal_aborted(handle->h_transaction->t_journal); | |
991 | } | |
992 | ||
993 | static inline void journal_abort_handle(handle_t *handle) | |
994 | { | |
995 | handle->h_aborted = 1; | |
996 | } | |
997 | ||
998 | #endif /* __KERNEL__ */ | |
999 | ||
1000 | /* Comparison functions for transaction IDs: perform comparisons using | |
1001 | * modulo arithmetic so that they work over sequence number wraps. */ | |
1002 | ||
1003 | static inline int tid_gt(tid_t x, tid_t y) | |
1004 | { | |
1005 | int difference = (x - y); | |
1006 | return (difference > 0); | |
1007 | } | |
1008 | ||
1009 | static inline int tid_geq(tid_t x, tid_t y) | |
1010 | { | |
1011 | int difference = (x - y); | |
1012 | return (difference >= 0); | |
1013 | } | |
1014 | ||
1015 | extern int journal_blocks_per_page(struct inode *inode); | |
1016 | ||
1017 | /* | |
1018 | * Return the minimum number of blocks which must be free in the journal | |
1019 | * before a new transaction may be started. Must be called under j_state_lock. | |
1020 | */ | |
1021 | static inline int jbd_space_needed(journal_t *journal) | |
1022 | { | |
1023 | int nblocks = journal->j_max_transaction_buffers; | |
1024 | if (journal->j_committing_transaction) | |
1025 | nblocks += journal->j_committing_transaction-> | |
1026 | t_outstanding_credits; | |
1027 | return nblocks; | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Definitions which augment the buffer_head layer | |
1032 | */ | |
1033 | ||
1034 | /* journaling buffer types */ | |
1035 | #define BJ_None 0 /* Not journaled */ | |
1036 | #define BJ_SyncData 1 /* Normal data: flush before commit */ | |
1037 | #define BJ_Metadata 2 /* Normal journaled metadata */ | |
1038 | #define BJ_Forget 3 /* Buffer superseded by this transaction */ | |
1039 | #define BJ_IO 4 /* Buffer is for temporary IO use */ | |
1040 | #define BJ_Shadow 5 /* Buffer contents being shadowed to the log */ | |
1041 | #define BJ_LogCtl 6 /* Buffer contains log descriptors */ | |
1042 | #define BJ_Reserved 7 /* Buffer is reserved for access by journal */ | |
1043 | #define BJ_Locked 8 /* Locked for I/O during commit */ | |
1044 | #define BJ_Types 9 | |
ae6ddcc5 | 1045 | |
1da177e4 LT |
1046 | extern int jbd_blocks_per_page(struct inode *inode); |
1047 | ||
1048 | #ifdef __KERNEL__ | |
1049 | ||
1050 | #define buffer_trace_init(bh) do {} while (0) | |
1051 | #define print_buffer_fields(bh) do {} while (0) | |
1052 | #define print_buffer_trace(bh) do {} while (0) | |
1053 | #define BUFFER_TRACE(bh, info) do {} while (0) | |
1054 | #define BUFFER_TRACE2(bh, bh2, info) do {} while (0) | |
1055 | #define JBUFFER_TRACE(jh, info) do {} while (0) | |
1056 | ||
1057 | #endif /* __KERNEL__ */ | |
1058 | ||
1da177e4 | 1059 | #endif /* _LINUX_JBD_H */ |