1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | /* |
3 | * linux/include/linux/jbd2.h |
4 | * |
5 | * Written by Stephen C. Tweedie <sct@redhat.com> |
6 | * |
7 | * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved |
8 | * |
9 | * Definitions for transaction data structures for the buffer cache |
10 | * filesystem journaling support. |
11 | */ |
12 | |
13 | #ifndef _LINUX_JBD2_H |
14 | #define _LINUX_JBD2_H |
15 | |
16 | /* Allow this file to be included directly into e2fsprogs */ |
17 | #ifndef __KERNEL__ |
18 | #include "jfs_compat.h" |
19 | #define JBD2_DEBUG |
20 | #else |
21 | |
22 | #include <linux/types.h> |
23 | #include <linux/buffer_head.h> |
24 | #include <linux/journal-head.h> |
25 | #include <linux/stddef.h> |
26 | #include <linux/mutex.h> |
27 | #include <linux/timer.h> |
28 | #include <linux/slab.h> |
29 | #include <linux/bit_spinlock.h> |
30 | #include <linux/blkdev.h> |
31 | #include <crypto/hash.h> |
32 | #endif |
33 | |
34 | #define journal_oom_retry 1 |
35 | |
36 | /* |
37 | * Define JBD2_PARANIOD_IOFAIL to cause a kernel BUG() if ext4 finds |
38 | * certain classes of error which can occur due to failed IOs. Under |
39 | * normal use we want ext4 to continue after such errors, because |
40 | * hardware _can_ fail, but for debugging purposes when running tests on |
41 | * known-good hardware we may want to trap these errors. |
42 | */ |
43 | #undef JBD2_PARANOID_IOFAIL |
44 | |
45 | /* |
46 | * The default maximum commit age, in seconds. |
47 | */ |
48 | #define JBD2_DEFAULT_MAX_COMMIT_AGE 5 |
49 | |
50 | #ifdef CONFIG_JBD2_DEBUG |
51 | /* |
52 | * Define JBD2_EXPENSIVE_CHECKING to enable more expensive internal |
53 | * consistency checks. By default we don't do this unless |
54 | * CONFIG_JBD2_DEBUG is on. |
55 | */ |
56 | #define JBD2_EXPENSIVE_CHECKING |
57 | void __jbd2_debug(int level, const char *file, const char *func, |
58 | unsigned int line, const char *fmt, ...); |
59 | |
60 | #define jbd2_debug(n, fmt, a...) \ |
61 | __jbd2_debug((n), __FILE__, __func__, __LINE__, (fmt), ##a) |
62 | #else |
63 | #define jbd2_debug(n, fmt, a...) no_printk(fmt, ##a) |
64 | #endif |
65 | |
66 | extern void *jbd2_alloc(size_t size, gfp_t flags); |
67 | extern void jbd2_free(void *ptr, size_t size); |
68 | |
69 | #define JBD2_MIN_JOURNAL_BLOCKS 1024 |
70 | #define JBD2_DEFAULT_FAST_COMMIT_BLOCKS 256 |
71 | |
72 | #ifdef __KERNEL__ |
73 | |
74 | /** |
75 | * typedef handle_t - The handle_t type represents a single atomic update being performed by some process. |
76 | * |
77 | * All filesystem modifications made by the process go |
78 | * through this handle. Recursive operations (such as quota operations) |
79 | * are gathered into a single update. |
80 | * |
81 | * The buffer credits field is used to account for journaled buffers |
82 | * being modified by the running process. To ensure that there is |
83 | * enough log space for all outstanding operations, we need to limit the |
84 | * number of outstanding buffers possible at any time. When the |
85 | * operation completes, any buffer credits not used are credited back to |
86 | * the transaction, so that at all times we know how many buffers the |
87 | * outstanding updates on a transaction might possibly touch. |
88 | * |
89 | * This is an opaque datatype. |
90 | **/ |
91 | typedef struct jbd2_journal_handle handle_t; /* Atomic operation type */ |
92 | |
93 | |
94 | /** |
95 | * typedef journal_t - The journal_t maintains all of the journaling state information for a single filesystem. |
96 | * |
97 | * journal_t is linked to from the fs superblock structure. |
98 | * |
99 | * We use the journal_t to keep track of all outstanding transaction |
100 | * activity on the filesystem, and to manage the state of the log |
101 | * writing process. |
102 | * |
103 | * This is an opaque datatype. |
104 | **/ |
105 | typedef struct journal_s journal_t; /* Journal control structure */ |
106 | #endif |
107 | |
108 | /* |
109 | * Internal structures used by the logging mechanism: |
110 | */ |
111 | |
112 | #define JBD2_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */ |
113 | |
114 | /* |
115 | * On-disk structures |
116 | */ |
117 | |
118 | /* |
119 | * Descriptor block types: |
120 | */ |
121 | |
122 | #define JBD2_DESCRIPTOR_BLOCK 1 |
123 | #define JBD2_COMMIT_BLOCK 2 |
124 | #define JBD2_SUPERBLOCK_V1 3 |
125 | #define JBD2_SUPERBLOCK_V2 4 |
126 | #define JBD2_REVOKE_BLOCK 5 |
127 | |
128 | /* |
129 | * Standard header for all descriptor blocks: |
130 | */ |
131 | typedef struct |
132 | { |
133 | __be32 ; |
134 | __be32 ; |
135 | __be32 ; |
136 | } ; |
137 | |
138 | /* |
139 | * Checksum types. |
140 | */ |
141 | #define JBD2_CRC32_CHKSUM 1 |
142 | #define JBD2_MD5_CHKSUM 2 |
143 | #define JBD2_SHA1_CHKSUM 3 |
144 | #define JBD2_CRC32C_CHKSUM 4 |
145 | |
146 | #define JBD2_CRC32_CHKSUM_SIZE 4 |
147 | |
148 | #define JBD2_CHECKSUM_BYTES (32 / sizeof(u32)) |
149 | /* |
150 | * Commit block header for storing transactional checksums: |
151 | * |
152 | * NOTE: If FEATURE_COMPAT_CHECKSUM (checksum v1) is set, the h_chksum* |
153 | * fields are used to store a checksum of the descriptor and data blocks. |
154 | * |
155 | * If FEATURE_INCOMPAT_CSUM_V2 (checksum v2) is set, then the h_chksum |
156 | * field is used to store crc32c(uuid+commit_block). Each journal metadata |
157 | * block gets its own checksum, and data block checksums are stored in |
158 | * journal_block_tag (in the descriptor). The other h_chksum* fields are |
159 | * not used. |
160 | * |
161 | * If FEATURE_INCOMPAT_CSUM_V3 is set, the descriptor block uses |
162 | * journal_block_tag3_t to store a full 32-bit checksum. Everything else |
163 | * is the same as v2. |
164 | * |
165 | * Checksum v1, v2, and v3 are mutually exclusive features. |
166 | */ |
167 | struct { |
168 | __be32 ; |
169 | __be32 ; |
170 | __be32 ; |
171 | unsigned char ; |
172 | unsigned char ; |
173 | unsigned char [2]; |
174 | __be32 [JBD2_CHECKSUM_BYTES]; |
175 | __be64 ; |
176 | __be32 ; |
177 | }; |
178 | |
179 | /* |
180 | * The block tag: used to describe a single buffer in the journal. |
181 | * t_blocknr_high is only used if INCOMPAT_64BIT is set, so this |
182 | * raw struct shouldn't be used for pointer math or sizeof() - use |
183 | * journal_tag_bytes(journal) instead to compute this. |
184 | */ |
185 | typedef struct journal_block_tag3_s |
186 | { |
187 | __be32 t_blocknr; /* The on-disk block number */ |
188 | __be32 t_flags; /* See below */ |
189 | __be32 t_blocknr_high; /* most-significant high 32bits. */ |
190 | __be32 t_checksum; /* crc32c(uuid+seq+block) */ |
191 | } journal_block_tag3_t; |
192 | |
193 | typedef struct journal_block_tag_s |
194 | { |
195 | __be32 t_blocknr; /* The on-disk block number */ |
196 | __be16 t_checksum; /* truncated crc32c(uuid+seq+block) */ |
197 | __be16 t_flags; /* See below */ |
198 | __be32 t_blocknr_high; /* most-significant high 32bits. */ |
199 | } journal_block_tag_t; |
200 | |
201 | /* Tail of descriptor or revoke block, for checksumming */ |
202 | struct jbd2_journal_block_tail { |
203 | __be32 t_checksum; /* crc32c(uuid+descr_block) */ |
204 | }; |
205 | |
206 | /* |
207 | * The revoke descriptor: used on disk to describe a series of blocks to |
208 | * be revoked from the log |
209 | */ |
210 | typedef struct |
211 | { |
212 | journal_header_t ; |
213 | __be32 ; /* Count of bytes used in the block */ |
214 | } ; |
215 | |
216 | /* Definitions for the journal tag flags word: */ |
217 | #define JBD2_FLAG_ESCAPE 1 /* on-disk block is escaped */ |
218 | #define JBD2_FLAG_SAME_UUID 2 /* block has same uuid as previous */ |
219 | #define JBD2_FLAG_DELETED 4 /* block deleted by this transaction */ |
220 | #define JBD2_FLAG_LAST_TAG 8 /* last tag in this descriptor block */ |
221 | |
222 | |
223 | /* |
224 | * The journal superblock. All fields are in big-endian byte order. |
225 | */ |
226 | typedef struct journal_superblock_s |
227 | { |
228 | /* 0x0000 */ |
229 | journal_header_t ; |
230 | |
231 | /* 0x000C */ |
232 | /* Static information describing the journal */ |
233 | __be32 s_blocksize; /* journal device blocksize */ |
234 | __be32 s_maxlen; /* total blocks in journal file */ |
235 | __be32 s_first; /* first block of log information */ |
236 | |
237 | /* 0x0018 */ |
238 | /* Dynamic information describing the current state of the log */ |
239 | __be32 s_sequence; /* first commit ID expected in log */ |
240 | __be32 s_start; /* blocknr of start of log */ |
241 | |
242 | /* 0x0020 */ |
243 | /* Error value, as set by jbd2_journal_abort(). */ |
244 | __be32 s_errno; |
245 | |
246 | /* 0x0024 */ |
247 | /* Remaining fields are only valid in a version-2 superblock */ |
248 | __be32 s_feature_compat; /* compatible feature set */ |
249 | __be32 s_feature_incompat; /* incompatible feature set */ |
250 | __be32 s_feature_ro_compat; /* readonly-compatible feature set */ |
251 | /* 0x0030 */ |
252 | __u8 s_uuid[16]; /* 128-bit uuid for journal */ |
253 | |
254 | /* 0x0040 */ |
255 | __be32 s_nr_users; /* Nr of filesystems sharing log */ |
256 | |
257 | __be32 s_dynsuper; /* Blocknr of dynamic superblock copy*/ |
258 | |
259 | /* 0x0048 */ |
260 | __be32 s_max_transaction; /* Limit of journal blocks per trans.*/ |
261 | __be32 s_max_trans_data; /* Limit of data blocks per trans. */ |
262 | |
263 | /* 0x0050 */ |
264 | __u8 s_checksum_type; /* checksum type */ |
265 | __u8 s_padding2[3]; |
266 | /* 0x0054 */ |
267 | __be32 s_num_fc_blks; /* Number of fast commit blocks */ |
268 | __be32 s_head; /* blocknr of head of log, only uptodate |
269 | * while the filesystem is clean */ |
270 | /* 0x005C */ |
271 | __u32 s_padding[40]; |
272 | __be32 s_checksum; /* crc32c(superblock) */ |
273 | |
274 | /* 0x0100 */ |
275 | __u8 s_users[16*48]; /* ids of all fs'es sharing the log */ |
276 | /* 0x0400 */ |
277 | } journal_superblock_t; |
278 | |
279 | #define JBD2_FEATURE_COMPAT_CHECKSUM 0x00000001 |
280 | |
281 | #define JBD2_FEATURE_INCOMPAT_REVOKE 0x00000001 |
282 | #define JBD2_FEATURE_INCOMPAT_64BIT 0x00000002 |
283 | #define JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT 0x00000004 |
284 | #define JBD2_FEATURE_INCOMPAT_CSUM_V2 0x00000008 |
285 | #define JBD2_FEATURE_INCOMPAT_CSUM_V3 0x00000010 |
286 | #define JBD2_FEATURE_INCOMPAT_FAST_COMMIT 0x00000020 |
287 | |
288 | /* See "journal feature predicate functions" below */ |
289 | |
290 | /* Features known to this kernel version: */ |
291 | #define JBD2_KNOWN_COMPAT_FEATURES JBD2_FEATURE_COMPAT_CHECKSUM |
292 | #define JBD2_KNOWN_ROCOMPAT_FEATURES 0 |
293 | #define JBD2_KNOWN_INCOMPAT_FEATURES (JBD2_FEATURE_INCOMPAT_REVOKE | \ |
294 | JBD2_FEATURE_INCOMPAT_64BIT | \ |
295 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | \ |
296 | JBD2_FEATURE_INCOMPAT_CSUM_V2 | \ |
297 | JBD2_FEATURE_INCOMPAT_CSUM_V3 | \ |
298 | JBD2_FEATURE_INCOMPAT_FAST_COMMIT) |
299 | |
300 | #ifdef __KERNEL__ |
301 | |
302 | #include <linux/fs.h> |
303 | #include <linux/sched.h> |
304 | |
305 | enum jbd_state_bits { |
306 | BH_JBD /* Has an attached ext3 journal_head */ |
307 | = BH_PrivateStart, |
308 | BH_JWrite, /* Being written to log (@@@ DEBUGGING) */ |
309 | BH_Freed, /* Has been freed (truncated) */ |
310 | BH_Revoked, /* Has been revoked from the log */ |
311 | BH_RevokeValid, /* Revoked flag is valid */ |
312 | BH_JBDDirty, /* Is dirty but journaled */ |
313 | BH_JournalHead, /* Pins bh->b_private and jh->b_bh */ |
314 | BH_Shadow, /* IO on shadow buffer is running */ |
315 | BH_Verified, /* Metadata block has been verified ok */ |
316 | BH_JBDPrivateStart, /* First bit available for private use by FS */ |
317 | }; |
318 | |
319 | BUFFER_FNS(JBD, jbd) |
320 | BUFFER_FNS(JWrite, jwrite) |
321 | BUFFER_FNS(JBDDirty, jbddirty) |
322 | TAS_BUFFER_FNS(JBDDirty, jbddirty) |
323 | BUFFER_FNS(Revoked, revoked) |
324 | TAS_BUFFER_FNS(Revoked, revoked) |
325 | BUFFER_FNS(RevokeValid, revokevalid) |
326 | TAS_BUFFER_FNS(RevokeValid, revokevalid) |
327 | BUFFER_FNS(Freed, freed) |
328 | BUFFER_FNS(Shadow, shadow) |
329 | BUFFER_FNS(Verified, verified) |
330 | |
331 | static inline struct buffer_head *jh2bh(struct journal_head *jh) |
332 | { |
333 | return jh->b_bh; |
334 | } |
335 | |
336 | static inline struct journal_head *bh2jh(struct buffer_head *bh) |
337 | { |
338 | return bh->b_private; |
339 | } |
340 | |
341 | static inline void jbd_lock_bh_journal_head(struct buffer_head *bh) |
342 | { |
343 | bit_spin_lock(bitnum: BH_JournalHead, addr: &bh->b_state); |
344 | } |
345 | |
346 | static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh) |
347 | { |
348 | bit_spin_unlock(bitnum: BH_JournalHead, addr: &bh->b_state); |
349 | } |
350 | |
351 | #define J_ASSERT(assert) BUG_ON(!(assert)) |
352 | |
353 | #define J_ASSERT_BH(bh, expr) J_ASSERT(expr) |
354 | #define J_ASSERT_JH(jh, expr) J_ASSERT(expr) |
355 | |
356 | #if defined(JBD2_PARANOID_IOFAIL) |
357 | #define J_EXPECT(expr, why...) J_ASSERT(expr) |
358 | #define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr) |
359 | #define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr) |
360 | #else |
361 | #define __journal_expect(expr, why...) \ |
362 | ({ \ |
363 | int val = (expr); \ |
364 | if (!val) { \ |
365 | printk(KERN_ERR \ |
366 | "JBD2 unexpected failure: %s: %s;\n", \ |
367 | __func__, #expr); \ |
368 | printk(KERN_ERR why "\n"); \ |
369 | } \ |
370 | val; \ |
371 | }) |
372 | #define J_EXPECT(expr, why...) __journal_expect(expr, ## why) |
373 | #define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why) |
374 | #define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why) |
375 | #endif |
376 | |
377 | /* Flags in jbd_inode->i_flags */ |
378 | #define __JI_COMMIT_RUNNING 0 |
379 | #define __JI_WRITE_DATA 1 |
380 | #define __JI_WAIT_DATA 2 |
381 | |
382 | /* |
383 | * Commit of the inode data in progress. We use this flag to protect us from |
384 | * concurrent deletion of inode. We cannot use reference to inode for this |
385 | * since we cannot afford doing last iput() on behalf of kjournald |
386 | */ |
387 | #define JI_COMMIT_RUNNING (1 << __JI_COMMIT_RUNNING) |
388 | /* Write allocated dirty buffers in this inode before commit */ |
389 | #define JI_WRITE_DATA (1 << __JI_WRITE_DATA) |
390 | /* Wait for outstanding data writes for this inode before commit */ |
391 | #define JI_WAIT_DATA (1 << __JI_WAIT_DATA) |
392 | |
393 | /** |
394 | * struct jbd2_inode - The jbd_inode type is the structure linking inodes in |
395 | * ordered mode present in a transaction so that we can sync them during commit. |
396 | */ |
397 | struct jbd2_inode { |
398 | /** |
399 | * @i_transaction: |
400 | * |
401 | * Which transaction does this inode belong to? Either the running |
402 | * transaction or the committing one. [j_list_lock] |
403 | */ |
404 | transaction_t *i_transaction; |
405 | |
406 | /** |
407 | * @i_next_transaction: |
408 | * |
409 | * Pointer to the running transaction modifying inode's data in case |
410 | * there is already a committing transaction touching it. [j_list_lock] |
411 | */ |
412 | transaction_t *i_next_transaction; |
413 | |
414 | /** |
415 | * @i_list: List of inodes in the i_transaction [j_list_lock] |
416 | */ |
417 | struct list_head i_list; |
418 | |
419 | /** |
420 | * @i_vfs_inode: |
421 | * |
422 | * VFS inode this inode belongs to [constant for lifetime of structure] |
423 | */ |
424 | struct inode *i_vfs_inode; |
425 | |
426 | /** |
427 | * @i_flags: Flags of inode [j_list_lock] |
428 | */ |
429 | unsigned long i_flags; |
430 | |
431 | /** |
432 | * @i_dirty_start: |
433 | * |
434 | * Offset in bytes where the dirty range for this inode starts. |
435 | * [j_list_lock] |
436 | */ |
437 | loff_t i_dirty_start; |
438 | |
439 | /** |
440 | * @i_dirty_end: |
441 | * |
442 | * Inclusive offset in bytes where the dirty range for this inode |
443 | * ends. [j_list_lock] |
444 | */ |
445 | loff_t i_dirty_end; |
446 | }; |
447 | |
448 | struct jbd2_revoke_table_s; |
449 | |
450 | /** |
451 | * struct jbd2_journal_handle - The jbd2_journal_handle type is the concrete |
452 | * type associated with handle_t. |
453 | * @h_transaction: Which compound transaction is this update a part of? |
454 | * @h_journal: Which journal handle belongs to - used iff h_reserved set. |
455 | * @h_rsv_handle: Handle reserved for finishing the logical operation. |
456 | * @h_total_credits: Number of remaining buffers we are allowed to add to |
457 | * journal. These are dirty buffers and revoke descriptor blocks. |
458 | * @h_revoke_credits: Number of remaining revoke records available for handle |
459 | * @h_ref: Reference count on this handle. |
460 | * @h_err: Field for caller's use to track errors through large fs operations. |
461 | * @h_sync: Flag for sync-on-close. |
462 | * @h_jdata: Flag to force data journaling. |
463 | * @h_reserved: Flag for handle for reserved credits. |
464 | * @h_aborted: Flag indicating fatal error on handle. |
465 | * @h_type: For handle statistics. |
466 | * @h_line_no: For handle statistics. |
467 | * @h_start_jiffies: Handle Start time. |
468 | * @h_requested_credits: Holds @h_total_credits after handle is started. |
469 | * @h_revoke_credits_requested: Holds @h_revoke_credits after handle is started. |
470 | * @saved_alloc_context: Saved context while transaction is open. |
471 | **/ |
472 | |
473 | /* Docbook can't yet cope with the bit fields, but will leave the documentation |
474 | * in so it can be fixed later. |
475 | */ |
476 | |
477 | struct jbd2_journal_handle |
478 | { |
479 | union { |
480 | transaction_t *h_transaction; |
481 | /* Which journal handle belongs to - used iff h_reserved set */ |
482 | journal_t *h_journal; |
483 | }; |
484 | |
485 | handle_t *h_rsv_handle; |
486 | int h_total_credits; |
487 | int h_revoke_credits; |
488 | int h_revoke_credits_requested; |
489 | int h_ref; |
490 | int h_err; |
491 | |
492 | /* Flags [no locking] */ |
493 | unsigned int h_sync: 1; |
494 | unsigned int h_jdata: 1; |
495 | unsigned int h_reserved: 1; |
496 | unsigned int h_aborted: 1; |
497 | unsigned int h_type: 8; |
498 | unsigned int h_line_no: 16; |
499 | |
500 | unsigned long h_start_jiffies; |
501 | unsigned int h_requested_credits; |
502 | |
503 | unsigned int saved_alloc_context; |
504 | }; |
505 | |
506 | |
507 | /* |
508 | * Some stats for checkpoint phase |
509 | */ |
510 | struct transaction_chp_stats_s { |
511 | unsigned long cs_chp_time; |
512 | __u32 cs_forced_to_close; |
513 | __u32 cs_written; |
514 | __u32 cs_dropped; |
515 | }; |
516 | |
517 | /* The transaction_t type is the guts of the journaling mechanism. It |
518 | * tracks a compound transaction through its various states: |
519 | * |
520 | * RUNNING: accepting new updates |
521 | * LOCKED: Updates still running but we don't accept new ones |
522 | * RUNDOWN: Updates are tidying up but have finished requesting |
523 | * new buffers to modify (state not used for now) |
524 | * FLUSH: All updates complete, but we are still writing to disk |
525 | * COMMIT: All data on disk, writing commit record |
526 | * FINISHED: We still have to keep the transaction for checkpointing. |
527 | * |
528 | * The transaction keeps track of all of the buffers modified by a |
529 | * running transaction, and all of the buffers committed but not yet |
530 | * flushed to home for finished transactions. |
531 | * (Locking Documentation improved by LockDoc) |
532 | */ |
533 | |
534 | /* |
535 | * Lock ranking: |
536 | * |
537 | * j_list_lock |
538 | * ->jbd_lock_bh_journal_head() (This is "innermost") |
539 | * |
540 | * j_state_lock |
541 | * ->b_state_lock |
542 | * |
543 | * b_state_lock |
544 | * ->j_list_lock |
545 | * |
546 | * j_state_lock |
547 | * ->j_list_lock (journal_unmap_buffer) |
548 | * |
549 | */ |
550 | |
551 | struct transaction_s |
552 | { |
553 | /* Pointer to the journal for this transaction. [no locking] */ |
554 | journal_t *t_journal; |
555 | |
556 | /* Sequence number for this transaction [no locking] */ |
557 | tid_t t_tid; |
558 | |
559 | /* |
560 | * Transaction's current state |
561 | * [no locking - only kjournald2 alters this] |
562 | * [j_list_lock] guards transition of a transaction into T_FINISHED |
563 | * state and subsequent call of __jbd2_journal_drop_transaction() |
564 | * FIXME: needs barriers |
565 | * KLUDGE: [use j_state_lock] |
566 | */ |
567 | enum { |
568 | T_RUNNING, |
569 | T_LOCKED, |
570 | T_SWITCH, |
571 | T_FLUSH, |
572 | T_COMMIT, |
573 | T_COMMIT_DFLUSH, |
574 | T_COMMIT_JFLUSH, |
575 | T_COMMIT_CALLBACK, |
576 | T_FINISHED |
577 | } t_state; |
578 | |
579 | /* |
580 | * Where in the log does this transaction's commit start? [no locking] |
581 | */ |
582 | unsigned long t_log_start; |
583 | |
584 | /* |
585 | * Number of buffers on the t_buffers list [j_list_lock, no locks |
586 | * needed for jbd2 thread] |
587 | */ |
588 | int t_nr_buffers; |
589 | |
590 | /* |
591 | * Doubly-linked circular list of all buffers reserved but not yet |
592 | * modified by this transaction [j_list_lock, no locks needed fo |
593 | * jbd2 thread] |
594 | */ |
595 | struct journal_head *t_reserved_list; |
596 | |
597 | /* |
598 | * Doubly-linked circular list of all metadata buffers owned by this |
599 | * transaction [j_list_lock, no locks needed for jbd2 thread] |
600 | */ |
601 | struct journal_head *t_buffers; |
602 | |
603 | /* |
604 | * Doubly-linked circular list of all forget buffers (superseded |
605 | * buffers which we can un-checkpoint once this transaction commits) |
606 | * [j_list_lock] |
607 | */ |
608 | struct journal_head *t_forget; |
609 | |
610 | /* |
611 | * Doubly-linked circular list of all buffers still to be flushed before |
612 | * this transaction can be checkpointed. [j_list_lock] |
613 | */ |
614 | struct journal_head *t_checkpoint_list; |
615 | |
616 | /* |
617 | * Doubly-linked circular list of metadata buffers being |
618 | * shadowed by log IO. The IO buffers on the iobuf list and |
619 | * the shadow buffers on this list match each other one for |
620 | * one at all times. [j_list_lock, no locks needed for jbd2 |
621 | * thread] |
622 | */ |
623 | struct journal_head *t_shadow_list; |
624 | |
625 | /* |
626 | * List of inodes associated with the transaction; e.g., ext4 uses |
627 | * this to track inodes in data=ordered and data=journal mode that |
628 | * need special handling on transaction commit; also used by ocfs2. |
629 | * [j_list_lock] |
630 | */ |
631 | struct list_head t_inode_list; |
632 | |
633 | /* |
634 | * Longest time some handle had to wait for running transaction |
635 | */ |
636 | unsigned long t_max_wait; |
637 | |
638 | /* |
639 | * When transaction started |
640 | */ |
641 | unsigned long t_start; |
642 | |
643 | /* |
644 | * When commit was requested [j_state_lock] |
645 | */ |
646 | unsigned long t_requested; |
647 | |
648 | /* |
649 | * Checkpointing stats [j_list_lock] |
650 | */ |
651 | struct transaction_chp_stats_s t_chp_stats; |
652 | |
653 | /* |
654 | * Number of outstanding updates running on this transaction |
655 | * [none] |
656 | */ |
657 | atomic_t t_updates; |
658 | |
659 | /* |
660 | * Number of blocks reserved for this transaction in the journal. |
661 | * This is including all credits reserved when starting transaction |
662 | * handles as well as all journal descriptor blocks needed for this |
663 | * transaction. [none] |
664 | */ |
665 | atomic_t t_outstanding_credits; |
666 | |
667 | /* |
668 | * Number of revoke records for this transaction added by already |
669 | * stopped handles. [none] |
670 | */ |
671 | atomic_t t_outstanding_revokes; |
672 | |
673 | /* |
674 | * How many handles used this transaction? [none] |
675 | */ |
676 | atomic_t t_handle_count; |
677 | |
678 | /* |
679 | * Forward and backward links for the circular list of all transactions |
680 | * awaiting checkpoint. [j_list_lock] |
681 | */ |
682 | transaction_t *t_cpnext, *t_cpprev; |
683 | |
684 | /* |
685 | * When will the transaction expire (become due for commit), in jiffies? |
686 | * [no locking] |
687 | */ |
688 | unsigned long t_expires; |
689 | |
690 | /* |
691 | * When this transaction started, in nanoseconds [no locking] |
692 | */ |
693 | ktime_t t_start_time; |
694 | |
695 | /* |
696 | * This transaction is being forced and some process is |
697 | * waiting for it to finish. |
698 | */ |
699 | unsigned int t_synchronous_commit:1; |
700 | |
701 | /* Disk flush needs to be sent to fs partition [no locking] */ |
702 | int t_need_data_flush; |
703 | |
704 | /* |
705 | * For use by the filesystem to store fs-specific data |
706 | * structures associated with the transaction |
707 | */ |
708 | struct list_head t_private_list; |
709 | }; |
710 | |
711 | struct transaction_run_stats_s { |
712 | unsigned long rs_wait; |
713 | unsigned long rs_request_delay; |
714 | unsigned long rs_running; |
715 | unsigned long rs_locked; |
716 | unsigned long rs_flushing; |
717 | unsigned long rs_logging; |
718 | |
719 | __u32 rs_handle_count; |
720 | __u32 rs_blocks; |
721 | __u32 rs_blocks_logged; |
722 | }; |
723 | |
724 | struct transaction_stats_s { |
725 | unsigned long ts_tid; |
726 | unsigned long ts_requested; |
727 | struct transaction_run_stats_s run; |
728 | }; |
729 | |
730 | static inline unsigned long |
731 | jbd2_time_diff(unsigned long start, unsigned long end) |
732 | { |
733 | if (end >= start) |
734 | return end - start; |
735 | |
736 | return end + (MAX_JIFFY_OFFSET - start); |
737 | } |
738 | |
739 | #define JBD2_NR_BATCH 64 |
740 | |
741 | enum passtype {PASS_SCAN, PASS_REVOKE, PASS_REPLAY}; |
742 | |
743 | #define JBD2_FC_REPLAY_STOP 0 |
744 | #define JBD2_FC_REPLAY_CONTINUE 1 |
745 | |
746 | /** |
747 | * struct journal_s - The journal_s type is the concrete type associated with |
748 | * journal_t. |
749 | */ |
750 | struct journal_s |
751 | { |
752 | /** |
753 | * @j_flags: General journaling state flags [j_state_lock, |
754 | * no lock for quick racy checks] |
755 | */ |
756 | unsigned long j_flags; |
757 | |
758 | /** |
759 | * @j_atomic_flags: Atomic journaling state flags. |
760 | */ |
761 | unsigned long j_atomic_flags; |
762 | |
763 | /** |
764 | * @j_errno: |
765 | * |
766 | * Is there an outstanding uncleared error on the journal (from a prior |
767 | * abort)? [j_state_lock] |
768 | */ |
769 | int j_errno; |
770 | |
771 | /** |
772 | * @j_abort_mutex: Lock the whole aborting procedure. |
773 | */ |
774 | struct mutex j_abort_mutex; |
775 | |
776 | /** |
777 | * @j_sb_buffer: The first part of the superblock buffer. |
778 | */ |
779 | struct buffer_head *j_sb_buffer; |
780 | |
781 | /** |
782 | * @j_superblock: The second part of the superblock buffer. |
783 | */ |
784 | journal_superblock_t *j_superblock; |
785 | |
786 | /** |
787 | * @j_state_lock: Protect the various scalars in the journal. |
788 | */ |
789 | rwlock_t j_state_lock; |
790 | |
791 | /** |
792 | * @j_barrier_count: |
793 | * |
794 | * Number of processes waiting to create a barrier lock [j_state_lock, |
795 | * no lock for quick racy checks] |
796 | */ |
797 | int j_barrier_count; |
798 | |
799 | /** |
800 | * @j_barrier: The barrier lock itself. |
801 | */ |
802 | struct mutex j_barrier; |
803 | |
804 | /** |
805 | * @j_running_transaction: |
806 | * |
807 | * Transactions: The current running transaction... |
808 | * [j_state_lock, no lock for quick racy checks] [caller holding |
809 | * open handle] |
810 | */ |
811 | transaction_t *j_running_transaction; |
812 | |
813 | /** |
814 | * @j_committing_transaction: |
815 | * |
816 | * the transaction we are pushing to disk |
817 | * [j_state_lock] [caller holding open handle] |
818 | */ |
819 | transaction_t *j_committing_transaction; |
820 | |
821 | /** |
822 | * @j_checkpoint_transactions: |
823 | * |
824 | * ... and a linked circular list of all transactions waiting for |
825 | * checkpointing. [j_list_lock] |
826 | */ |
827 | transaction_t *j_checkpoint_transactions; |
828 | |
829 | /** |
830 | * @j_wait_transaction_locked: |
831 | * |
832 | * Wait queue for waiting for a locked transaction to start committing, |
833 | * or for a barrier lock to be released. |
834 | */ |
835 | wait_queue_head_t j_wait_transaction_locked; |
836 | |
837 | /** |
838 | * @j_wait_done_commit: Wait queue for waiting for commit to complete. |
839 | */ |
840 | wait_queue_head_t j_wait_done_commit; |
841 | |
842 | /** |
843 | * @j_wait_commit: Wait queue to trigger commit. |
844 | */ |
845 | wait_queue_head_t j_wait_commit; |
846 | |
847 | /** |
848 | * @j_wait_updates: Wait queue to wait for updates to complete. |
849 | */ |
850 | wait_queue_head_t j_wait_updates; |
851 | |
852 | /** |
853 | * @j_wait_reserved: |
854 | * |
855 | * Wait queue to wait for reserved buffer credits to drop. |
856 | */ |
857 | wait_queue_head_t j_wait_reserved; |
858 | |
859 | /** |
860 | * @j_fc_wait: |
861 | * |
862 | * Wait queue to wait for completion of async fast commits. |
863 | */ |
864 | wait_queue_head_t j_fc_wait; |
865 | |
866 | /** |
867 | * @j_checkpoint_mutex: |
868 | * |
869 | * Semaphore for locking against concurrent checkpoints. |
870 | */ |
871 | struct mutex j_checkpoint_mutex; |
872 | |
873 | /** |
874 | * @j_chkpt_bhs: |
875 | * |
876 | * List of buffer heads used by the checkpoint routine. This |
877 | * was moved from jbd2_log_do_checkpoint() to reduce stack |
878 | * usage. Access to this array is controlled by the |
879 | * @j_checkpoint_mutex. [j_checkpoint_mutex] |
880 | */ |
881 | struct buffer_head *j_chkpt_bhs[JBD2_NR_BATCH]; |
882 | |
883 | /** |
884 | * @j_shrinker: |
885 | * |
886 | * Journal head shrinker, reclaim buffer's journal head which |
887 | * has been written back. |
888 | */ |
889 | struct shrinker *j_shrinker; |
890 | |
891 | /** |
892 | * @j_checkpoint_jh_count: |
893 | * |
894 | * Number of journal buffers on the checkpoint list. [j_list_lock] |
895 | */ |
896 | struct percpu_counter j_checkpoint_jh_count; |
897 | |
898 | /** |
899 | * @j_shrink_transaction: |
900 | * |
901 | * Record next transaction will shrink on the checkpoint list. |
902 | * [j_list_lock] |
903 | */ |
904 | transaction_t *j_shrink_transaction; |
905 | |
906 | /** |
907 | * @j_head: |
908 | * |
909 | * Journal head: identifies the first unused block in the journal. |
910 | * [j_state_lock] |
911 | */ |
912 | unsigned long j_head; |
913 | |
914 | /** |
915 | * @j_tail: |
916 | * |
917 | * Journal tail: identifies the oldest still-used block in the journal. |
918 | * [j_state_lock] |
919 | */ |
920 | unsigned long j_tail; |
921 | |
922 | /** |
923 | * @j_free: |
924 | * |
925 | * Journal free: how many free blocks are there in the journal? |
926 | * [j_state_lock] |
927 | */ |
928 | unsigned long j_free; |
929 | |
930 | /** |
931 | * @j_first: |
932 | * |
933 | * The block number of the first usable block in the journal |
934 | * [j_state_lock]. |
935 | */ |
936 | unsigned long j_first; |
937 | |
938 | /** |
939 | * @j_last: |
940 | * |
941 | * The block number one beyond the last usable block in the journal |
942 | * [j_state_lock]. |
943 | */ |
944 | unsigned long j_last; |
945 | |
946 | /** |
947 | * @j_fc_first: |
948 | * |
949 | * The block number of the first fast commit block in the journal |
950 | * [j_state_lock]. |
951 | */ |
952 | unsigned long j_fc_first; |
953 | |
954 | /** |
955 | * @j_fc_off: |
956 | * |
957 | * Number of fast commit blocks currently allocated. Accessed only |
958 | * during fast commit. Currently only process can do fast commit, so |
959 | * this field is not protected by any lock. |
960 | */ |
961 | unsigned long j_fc_off; |
962 | |
963 | /** |
964 | * @j_fc_last: |
965 | * |
966 | * The block number one beyond the last fast commit block in the journal |
967 | * [j_state_lock]. |
968 | */ |
969 | unsigned long j_fc_last; |
970 | |
971 | /** |
972 | * @j_dev: Device where we store the journal. |
973 | */ |
974 | struct block_device *j_dev; |
975 | |
976 | /** |
977 | * @j_blocksize: Block size for the location where we store the journal. |
978 | */ |
979 | int j_blocksize; |
980 | |
981 | /** |
982 | * @j_blk_offset: |
983 | * |
984 | * Starting block offset into the device where we store the journal. |
985 | */ |
986 | unsigned long long j_blk_offset; |
987 | |
988 | /** |
989 | * @j_devname: Journal device name. |
990 | */ |
991 | char j_devname[BDEVNAME_SIZE+24]; |
992 | |
993 | /** |
994 | * @j_fs_dev: |
995 | * |
996 | * Device which holds the client fs. For internal journal this will be |
997 | * equal to j_dev. |
998 | */ |
999 | struct block_device *j_fs_dev; |
1000 | |
1001 | /** |
1002 | * @j_total_len: Total maximum capacity of the journal region on disk. |
1003 | */ |
1004 | unsigned int j_total_len; |
1005 | |
1006 | /** |
1007 | * @j_reserved_credits: |
1008 | * |
1009 | * Number of buffers reserved from the running transaction. |
1010 | */ |
1011 | atomic_t j_reserved_credits; |
1012 | |
1013 | /** |
1014 | * @j_list_lock: Protects the buffer lists and internal buffer state. |
1015 | */ |
1016 | spinlock_t j_list_lock; |
1017 | |
1018 | /** |
1019 | * @j_inode: |
1020 | * |
1021 | * Optional inode where we store the journal. If present, all |
1022 | * journal block numbers are mapped into this inode via bmap(). |
1023 | */ |
1024 | struct inode *j_inode; |
1025 | |
1026 | /** |
1027 | * @j_tail_sequence: |
1028 | * |
1029 | * Sequence number of the oldest transaction in the log [j_state_lock] |
1030 | */ |
1031 | tid_t j_tail_sequence; |
1032 | |
1033 | /** |
1034 | * @j_transaction_sequence: |
1035 | * |
1036 | * Sequence number of the next transaction to grant [j_state_lock] |
1037 | */ |
1038 | tid_t j_transaction_sequence; |
1039 | |
1040 | /** |
1041 | * @j_commit_sequence: |
1042 | * |
1043 | * Sequence number of the most recently committed transaction |
1044 | * [j_state_lock, no lock for quick racy checks] |
1045 | */ |
1046 | tid_t j_commit_sequence; |
1047 | |
1048 | /** |
1049 | * @j_commit_request: |
1050 | * |
1051 | * Sequence number of the most recent transaction wanting commit |
1052 | * [j_state_lock, no lock for quick racy checks] |
1053 | */ |
1054 | tid_t j_commit_request; |
1055 | |
1056 | /** |
1057 | * @j_uuid: |
1058 | * |
1059 | * Journal uuid: identifies the object (filesystem, LVM volume etc) |
1060 | * backed by this journal. This will eventually be replaced by an array |
1061 | * of uuids, allowing us to index multiple devices within a single |
1062 | * journal and to perform atomic updates across them. |
1063 | */ |
1064 | __u8 j_uuid[16]; |
1065 | |
1066 | /** |
1067 | * @j_task: Pointer to the current commit thread for this journal. |
1068 | */ |
1069 | struct task_struct *j_task; |
1070 | |
1071 | /** |
1072 | * @j_max_transaction_buffers: |
1073 | * |
1074 | * Maximum number of metadata buffers to allow in a single compound |
1075 | * commit transaction. |
1076 | */ |
1077 | int j_max_transaction_buffers; |
1078 | |
1079 | /** |
1080 | * @j_revoke_records_per_block: |
1081 | * |
1082 | * Number of revoke records that fit in one descriptor block. |
1083 | */ |
1084 | int j_revoke_records_per_block; |
1085 | |
1086 | /** |
1087 | * @j_commit_interval: |
1088 | * |
1089 | * What is the maximum transaction lifetime before we begin a commit? |
1090 | */ |
1091 | unsigned long j_commit_interval; |
1092 | |
1093 | /** |
1094 | * @j_commit_timer: The timer used to wakeup the commit thread. |
1095 | */ |
1096 | struct timer_list j_commit_timer; |
1097 | |
1098 | /** |
1099 | * @j_revoke_lock: Protect the revoke table. |
1100 | */ |
1101 | spinlock_t j_revoke_lock; |
1102 | |
1103 | /** |
1104 | * @j_revoke: |
1105 | * |
1106 | * The revoke table - maintains the list of revoked blocks in the |
1107 | * current transaction. |
1108 | */ |
1109 | struct jbd2_revoke_table_s *j_revoke; |
1110 | |
1111 | /** |
1112 | * @j_revoke_table: Alternate revoke tables for j_revoke. |
1113 | */ |
1114 | struct jbd2_revoke_table_s *j_revoke_table[2]; |
1115 | |
1116 | /** |
1117 | * @j_wbuf: Array of bhs for jbd2_journal_commit_transaction. |
1118 | */ |
1119 | struct buffer_head **j_wbuf; |
1120 | |
1121 | /** |
1122 | * @j_fc_wbuf: Array of fast commit bhs for fast commit. Accessed only |
1123 | * during a fast commit. Currently only process can do fast commit, so |
1124 | * this field is not protected by any lock. |
1125 | */ |
1126 | struct buffer_head **j_fc_wbuf; |
1127 | |
1128 | /** |
1129 | * @j_wbufsize: |
1130 | * |
1131 | * Size of @j_wbuf array. |
1132 | */ |
1133 | int j_wbufsize; |
1134 | |
1135 | /** |
1136 | * @j_fc_wbufsize: |
1137 | * |
1138 | * Size of @j_fc_wbuf array. |
1139 | */ |
1140 | int j_fc_wbufsize; |
1141 | |
1142 | /** |
1143 | * @j_last_sync_writer: |
1144 | * |
1145 | * The pid of the last person to run a synchronous operation |
1146 | * through the journal. |
1147 | */ |
1148 | pid_t j_last_sync_writer; |
1149 | |
1150 | /** |
1151 | * @j_average_commit_time: |
1152 | * |
1153 | * The average amount of time in nanoseconds it takes to commit a |
1154 | * transaction to disk. [j_state_lock] |
1155 | */ |
1156 | u64 j_average_commit_time; |
1157 | |
1158 | /** |
1159 | * @j_min_batch_time: |
1160 | * |
1161 | * Minimum time that we should wait for additional filesystem operations |
1162 | * to get batched into a synchronous handle in microseconds. |
1163 | */ |
1164 | u32 j_min_batch_time; |
1165 | |
1166 | /** |
1167 | * @j_max_batch_time: |
1168 | * |
1169 | * Maximum time that we should wait for additional filesystem operations |
1170 | * to get batched into a synchronous handle in microseconds. |
1171 | */ |
1172 | u32 j_max_batch_time; |
1173 | |
1174 | /** |
1175 | * @j_commit_callback: |
1176 | * |
1177 | * This function is called when a transaction is closed. |
1178 | */ |
1179 | void (*j_commit_callback)(journal_t *, |
1180 | transaction_t *); |
1181 | |
1182 | /** |
1183 | * @j_submit_inode_data_buffers: |
1184 | * |
1185 | * This function is called for all inodes associated with the |
1186 | * committing transaction marked with JI_WRITE_DATA flag |
1187 | * before we start to write out the transaction to the journal. |
1188 | */ |
1189 | int (*j_submit_inode_data_buffers) |
1190 | (struct jbd2_inode *); |
1191 | |
1192 | /** |
1193 | * @j_finish_inode_data_buffers: |
1194 | * |
1195 | * This function is called for all inodes associated with the |
1196 | * committing transaction marked with JI_WAIT_DATA flag |
1197 | * after we have written the transaction to the journal |
1198 | * but before we write out the commit block. |
1199 | */ |
1200 | int (*j_finish_inode_data_buffers) |
1201 | (struct jbd2_inode *); |
1202 | |
1203 | /* |
1204 | * Journal statistics |
1205 | */ |
1206 | |
1207 | /** |
1208 | * @j_history_lock: Protect the transactions statistics history. |
1209 | */ |
1210 | spinlock_t j_history_lock; |
1211 | |
1212 | /** |
1213 | * @j_proc_entry: procfs entry for the jbd statistics directory. |
1214 | */ |
1215 | struct proc_dir_entry *j_proc_entry; |
1216 | |
1217 | /** |
1218 | * @j_stats: Overall statistics. |
1219 | */ |
1220 | struct transaction_stats_s j_stats; |
1221 | |
1222 | /** |
1223 | * @j_failed_commit: Failed journal commit ID. |
1224 | */ |
1225 | unsigned int j_failed_commit; |
1226 | |
1227 | /** |
1228 | * @j_private: |
1229 | * |
1230 | * An opaque pointer to fs-private information. ext3 puts its |
1231 | * superblock pointer here. |
1232 | */ |
1233 | void *j_private; |
1234 | |
1235 | /** |
1236 | * @j_chksum_driver: |
1237 | * |
1238 | * Reference to checksum algorithm driver via cryptoapi. |
1239 | */ |
1240 | struct crypto_shash *j_chksum_driver; |
1241 | |
1242 | /** |
1243 | * @j_csum_seed: |
1244 | * |
1245 | * Precomputed journal UUID checksum for seeding other checksums. |
1246 | */ |
1247 | __u32 j_csum_seed; |
1248 | |
1249 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1250 | /** |
1251 | * @j_trans_commit_map: |
1252 | * |
1253 | * Lockdep entity to track transaction commit dependencies. Handles |
1254 | * hold this "lock" for read, when we wait for commit, we acquire the |
1255 | * "lock" for writing. This matches the properties of jbd2 journalling |
1256 | * where the running transaction has to wait for all handles to be |
1257 | * dropped to commit that transaction and also acquiring a handle may |
1258 | * require transaction commit to finish. |
1259 | */ |
1260 | struct lockdep_map j_trans_commit_map; |
1261 | #endif |
1262 | |
1263 | /** |
1264 | * @j_fc_cleanup_callback: |
1265 | * |
1266 | * Clean-up after fast commit or full commit. JBD2 calls this function |
1267 | * after every commit operation. |
1268 | */ |
1269 | void (*j_fc_cleanup_callback)(struct journal_s *journal, int full, tid_t tid); |
1270 | |
1271 | /** |
1272 | * @j_fc_replay_callback: |
1273 | * |
1274 | * File-system specific function that performs replay of a fast |
1275 | * commit. JBD2 calls this function for each fast commit block found in |
1276 | * the journal. This function should return JBD2_FC_REPLAY_CONTINUE |
1277 | * to indicate that the block was processed correctly and more fast |
1278 | * commit replay should continue. Return value of JBD2_FC_REPLAY_STOP |
1279 | * indicates the end of replay (no more blocks remaining). A negative |
1280 | * return value indicates error. |
1281 | */ |
1282 | int (*j_fc_replay_callback)(struct journal_s *journal, |
1283 | struct buffer_head *bh, |
1284 | enum passtype pass, int off, |
1285 | tid_t expected_commit_id); |
1286 | |
1287 | /** |
1288 | * @j_bmap: |
1289 | * |
1290 | * Bmap function that should be used instead of the generic |
1291 | * VFS bmap function. |
1292 | */ |
1293 | int (*j_bmap)(struct journal_s *journal, sector_t *block); |
1294 | }; |
1295 | |
1296 | #define jbd2_might_wait_for_commit(j) \ |
1297 | do { \ |
1298 | rwsem_acquire(&j->j_trans_commit_map, 0, 0, _THIS_IP_); \ |
1299 | rwsem_release(&j->j_trans_commit_map, _THIS_IP_); \ |
1300 | } while (0) |
1301 | |
1302 | /* |
1303 | * We can support any known requested features iff the |
1304 | * superblock is not in version 1. Otherwise we fail to support any |
1305 | * extended sb features. |
1306 | */ |
1307 | static inline bool jbd2_format_support_feature(journal_t *j) |
1308 | { |
1309 | return j->j_superblock->s_header.h_blocktype != |
1310 | cpu_to_be32(JBD2_SUPERBLOCK_V1); |
1311 | } |
1312 | |
1313 | /* journal feature predicate functions */ |
1314 | #define JBD2_FEATURE_COMPAT_FUNCS(name, flagname) \ |
1315 | static inline bool jbd2_has_feature_##name(journal_t *j) \ |
1316 | { \ |
1317 | return (jbd2_format_support_feature(j) && \ |
1318 | ((j)->j_superblock->s_feature_compat & \ |
1319 | cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname)) != 0); \ |
1320 | } \ |
1321 | static inline void jbd2_set_feature_##name(journal_t *j) \ |
1322 | { \ |
1323 | (j)->j_superblock->s_feature_compat |= \ |
1324 | cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname); \ |
1325 | } \ |
1326 | static inline void jbd2_clear_feature_##name(journal_t *j) \ |
1327 | { \ |
1328 | (j)->j_superblock->s_feature_compat &= \ |
1329 | ~cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname); \ |
1330 | } |
1331 | |
1332 | #define JBD2_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ |
1333 | static inline bool jbd2_has_feature_##name(journal_t *j) \ |
1334 | { \ |
1335 | return (jbd2_format_support_feature(j) && \ |
1336 | ((j)->j_superblock->s_feature_ro_compat & \ |
1337 | cpu_to_be32(JBD2_FEATURE_RO_COMPAT_##flagname)) != 0); \ |
1338 | } \ |
1339 | static inline void jbd2_set_feature_##name(journal_t *j) \ |
1340 | { \ |
1341 | (j)->j_superblock->s_feature_ro_compat |= \ |
1342 | cpu_to_be32(JBD2_FEATURE_RO_COMPAT_##flagname); \ |
1343 | } \ |
1344 | static inline void jbd2_clear_feature_##name(journal_t *j) \ |
1345 | { \ |
1346 | (j)->j_superblock->s_feature_ro_compat &= \ |
1347 | ~cpu_to_be32(JBD2_FEATURE_RO_COMPAT_##flagname); \ |
1348 | } |
1349 | |
1350 | #define JBD2_FEATURE_INCOMPAT_FUNCS(name, flagname) \ |
1351 | static inline bool jbd2_has_feature_##name(journal_t *j) \ |
1352 | { \ |
1353 | return (jbd2_format_support_feature(j) && \ |
1354 | ((j)->j_superblock->s_feature_incompat & \ |
1355 | cpu_to_be32(JBD2_FEATURE_INCOMPAT_##flagname)) != 0); \ |
1356 | } \ |
1357 | static inline void jbd2_set_feature_##name(journal_t *j) \ |
1358 | { \ |
1359 | (j)->j_superblock->s_feature_incompat |= \ |
1360 | cpu_to_be32(JBD2_FEATURE_INCOMPAT_##flagname); \ |
1361 | } \ |
1362 | static inline void jbd2_clear_feature_##name(journal_t *j) \ |
1363 | { \ |
1364 | (j)->j_superblock->s_feature_incompat &= \ |
1365 | ~cpu_to_be32(JBD2_FEATURE_INCOMPAT_##flagname); \ |
1366 | } |
1367 | |
1368 | JBD2_FEATURE_COMPAT_FUNCS(checksum, CHECKSUM) |
1369 | |
1370 | JBD2_FEATURE_INCOMPAT_FUNCS(revoke, REVOKE) |
1371 | JBD2_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) |
1372 | JBD2_FEATURE_INCOMPAT_FUNCS(async_commit, ASYNC_COMMIT) |
1373 | JBD2_FEATURE_INCOMPAT_FUNCS(csum2, CSUM_V2) |
1374 | JBD2_FEATURE_INCOMPAT_FUNCS(csum3, CSUM_V3) |
1375 | JBD2_FEATURE_INCOMPAT_FUNCS(fast_commit, FAST_COMMIT) |
1376 | |
1377 | /* |
1378 | * Journal flag definitions |
1379 | */ |
1380 | #define JBD2_UNMOUNT 0x001 /* Journal thread is being destroyed */ |
1381 | #define JBD2_ABORT 0x002 /* Journaling has been aborted for errors. */ |
1382 | #define JBD2_ACK_ERR 0x004 /* The errno in the sb has been acked */ |
1383 | #define JBD2_FLUSHED 0x008 /* The journal superblock has been flushed */ |
1384 | #define JBD2_LOADED 0x010 /* The journal superblock has been loaded */ |
1385 | #define JBD2_BARRIER 0x020 /* Use IDE barriers */ |
1386 | #define JBD2_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file |
1387 | * data write error in ordered |
1388 | * mode */ |
1389 | #define JBD2_CYCLE_RECORD 0x080 /* Journal cycled record log on |
1390 | * clean and empty filesystem |
1391 | * logging area */ |
1392 | #define JBD2_FAST_COMMIT_ONGOING 0x100 /* Fast commit is ongoing */ |
1393 | #define JBD2_FULL_COMMIT_ONGOING 0x200 /* Full commit is ongoing */ |
1394 | #define JBD2_JOURNAL_FLUSH_DISCARD 0x0001 |
1395 | #define JBD2_JOURNAL_FLUSH_ZEROOUT 0x0002 |
1396 | #define JBD2_JOURNAL_FLUSH_VALID (JBD2_JOURNAL_FLUSH_DISCARD | \ |
1397 | JBD2_JOURNAL_FLUSH_ZEROOUT) |
1398 | |
1399 | /* |
1400 | * Journal atomic flag definitions |
1401 | */ |
1402 | #define JBD2_CHECKPOINT_IO_ERROR 0x001 /* Detect io error while writing |
1403 | * buffer back to disk */ |
1404 | |
1405 | /* |
1406 | * Function declarations for the journaling transaction and buffer |
1407 | * management |
1408 | */ |
1409 | |
1410 | /* Filing buffers */ |
1411 | extern void jbd2_journal_unfile_buffer(journal_t *, struct journal_head *); |
1412 | extern bool __jbd2_journal_refile_buffer(struct journal_head *); |
1413 | extern void jbd2_journal_refile_buffer(journal_t *, struct journal_head *); |
1414 | extern void __jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int); |
1415 | extern void jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int); |
1416 | static inline void jbd2_file_log_bh(struct list_head *head, struct buffer_head *bh) |
1417 | { |
1418 | list_add_tail(new: &bh->b_assoc_buffers, head); |
1419 | } |
1420 | static inline void jbd2_unfile_log_bh(struct buffer_head *bh) |
1421 | { |
1422 | list_del_init(entry: &bh->b_assoc_buffers); |
1423 | } |
1424 | |
1425 | /* Log buffer allocation */ |
1426 | struct buffer_head *jbd2_journal_get_descriptor_buffer(transaction_t *, int); |
1427 | void jbd2_descriptor_block_csum_set(journal_t *, struct buffer_head *); |
1428 | int jbd2_journal_next_log_block(journal_t *, unsigned long long *); |
1429 | int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid, |
1430 | unsigned long *block); |
1431 | int __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block); |
1432 | void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block); |
1433 | |
1434 | /* Commit management */ |
1435 | extern void jbd2_journal_commit_transaction(journal_t *); |
1436 | |
1437 | /* Checkpoint list management */ |
1438 | void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy); |
1439 | unsigned long jbd2_journal_shrink_checkpoint_list(journal_t *journal, unsigned long *nr_to_scan); |
1440 | int __jbd2_journal_remove_checkpoint(struct journal_head *); |
1441 | int jbd2_journal_try_remove_checkpoint(struct journal_head *jh); |
1442 | void jbd2_journal_destroy_checkpoint(journal_t *journal); |
1443 | void __jbd2_journal_insert_checkpoint(struct journal_head *, transaction_t *); |
1444 | |
1445 | |
1446 | /* |
1447 | * Triggers |
1448 | */ |
1449 | |
1450 | struct jbd2_buffer_trigger_type { |
1451 | /* |
1452 | * Fired a the moment data to write to the journal are known to be |
1453 | * stable - so either at the moment b_frozen_data is created or just |
1454 | * before a buffer is written to the journal. mapped_data is a mapped |
1455 | * buffer that is the frozen data for commit. |
1456 | */ |
1457 | void (*t_frozen)(struct jbd2_buffer_trigger_type *type, |
1458 | struct buffer_head *bh, void *mapped_data, |
1459 | size_t size); |
1460 | |
1461 | /* |
1462 | * Fired during journal abort for dirty buffers that will not be |
1463 | * committed. |
1464 | */ |
1465 | void (*t_abort)(struct jbd2_buffer_trigger_type *type, |
1466 | struct buffer_head *bh); |
1467 | }; |
1468 | |
1469 | extern void jbd2_buffer_frozen_trigger(struct journal_head *jh, |
1470 | void *mapped_data, |
1471 | struct jbd2_buffer_trigger_type *triggers); |
1472 | extern void jbd2_buffer_abort_trigger(struct journal_head *jh, |
1473 | struct jbd2_buffer_trigger_type *triggers); |
1474 | |
1475 | /* Buffer IO */ |
1476 | extern int jbd2_journal_write_metadata_buffer(transaction_t *transaction, |
1477 | struct journal_head *jh_in, |
1478 | struct buffer_head **bh_out, |
1479 | sector_t blocknr); |
1480 | |
1481 | /* Transaction cache support */ |
1482 | extern void jbd2_journal_destroy_transaction_cache(void); |
1483 | extern int __init jbd2_journal_init_transaction_cache(void); |
1484 | extern void jbd2_journal_free_transaction(transaction_t *); |
1485 | |
1486 | /* |
1487 | * Journal locking. |
1488 | * |
1489 | * We need to lock the journal during transaction state changes so that nobody |
1490 | * ever tries to take a handle on the running transaction while we are in the |
1491 | * middle of moving it to the commit phase. j_state_lock does this. |
1492 | * |
1493 | * Note that the locking is completely interrupt unsafe. We never touch |
1494 | * journal structures from interrupts. |
1495 | */ |
1496 | |
1497 | static inline handle_t *journal_current_handle(void) |
1498 | { |
1499 | return current->journal_info; |
1500 | } |
1501 | |
1502 | /* The journaling code user interface: |
1503 | * |
1504 | * Create and destroy handles |
1505 | * Register buffer modifications against the current transaction. |
1506 | */ |
1507 | |
1508 | extern handle_t *jbd2_journal_start(journal_t *, int nblocks); |
1509 | extern handle_t *jbd2__journal_start(journal_t *, int blocks, int rsv_blocks, |
1510 | int revoke_records, gfp_t gfp_mask, |
1511 | unsigned int type, unsigned int line_no); |
1512 | extern int jbd2_journal_restart(handle_t *, int nblocks); |
1513 | extern int jbd2__journal_restart(handle_t *, int nblocks, |
1514 | int revoke_records, gfp_t gfp_mask); |
1515 | extern int jbd2_journal_start_reserved(handle_t *handle, |
1516 | unsigned int type, unsigned int line_no); |
1517 | extern void jbd2_journal_free_reserved(handle_t *handle); |
1518 | extern int jbd2_journal_extend(handle_t *handle, int nblocks, |
1519 | int revoke_records); |
1520 | extern int jbd2_journal_get_write_access(handle_t *, struct buffer_head *); |
1521 | extern int jbd2_journal_get_create_access (handle_t *, struct buffer_head *); |
1522 | extern int jbd2_journal_get_undo_access(handle_t *, struct buffer_head *); |
1523 | void jbd2_journal_set_triggers(struct buffer_head *, |
1524 | struct jbd2_buffer_trigger_type *type); |
1525 | extern int jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *); |
1526 | extern int jbd2_journal_forget (handle_t *, struct buffer_head *); |
1527 | int jbd2_journal_invalidate_folio(journal_t *, struct folio *, |
1528 | size_t offset, size_t length); |
1529 | bool jbd2_journal_try_to_free_buffers(journal_t *journal, struct folio *folio); |
1530 | extern int jbd2_journal_stop(handle_t *); |
1531 | extern int jbd2_journal_flush(journal_t *journal, unsigned int flags); |
1532 | extern void jbd2_journal_lock_updates (journal_t *); |
1533 | extern void jbd2_journal_unlock_updates (journal_t *); |
1534 | |
1535 | void jbd2_journal_wait_updates(journal_t *); |
1536 | |
1537 | extern journal_t * jbd2_journal_init_dev(struct block_device *bdev, |
1538 | struct block_device *fs_dev, |
1539 | unsigned long long start, int len, int bsize); |
1540 | extern journal_t * jbd2_journal_init_inode (struct inode *); |
1541 | extern int jbd2_journal_update_format (journal_t *); |
1542 | extern int jbd2_journal_check_used_features |
1543 | (journal_t *, unsigned long, unsigned long, unsigned long); |
1544 | extern int jbd2_journal_check_available_features |
1545 | (journal_t *, unsigned long, unsigned long, unsigned long); |
1546 | extern int jbd2_journal_set_features |
1547 | (journal_t *, unsigned long, unsigned long, unsigned long); |
1548 | extern void jbd2_journal_clear_features |
1549 | (journal_t *, unsigned long, unsigned long, unsigned long); |
1550 | extern int jbd2_journal_load (journal_t *journal); |
1551 | extern int jbd2_journal_destroy (journal_t *); |
1552 | extern int jbd2_journal_recover (journal_t *journal); |
1553 | extern int jbd2_journal_wipe (journal_t *, int); |
1554 | extern int jbd2_journal_skip_recovery (journal_t *); |
1555 | extern void jbd2_journal_update_sb_errno(journal_t *); |
1556 | extern int jbd2_journal_update_sb_log_tail (journal_t *, tid_t, |
1557 | unsigned long, blk_opf_t); |
1558 | extern void jbd2_journal_abort (journal_t *, int); |
1559 | extern int jbd2_journal_errno (journal_t *); |
1560 | extern void jbd2_journal_ack_err (journal_t *); |
1561 | extern int jbd2_journal_clear_err (journal_t *); |
1562 | extern int jbd2_journal_bmap(journal_t *, unsigned long, unsigned long long *); |
1563 | extern int jbd2_journal_force_commit(journal_t *); |
1564 | extern int jbd2_journal_force_commit_nested(journal_t *); |
1565 | extern int jbd2_journal_inode_ranged_write(handle_t *handle, |
1566 | struct jbd2_inode *inode, loff_t start_byte, |
1567 | loff_t length); |
1568 | extern int jbd2_journal_inode_ranged_wait(handle_t *handle, |
1569 | struct jbd2_inode *inode, loff_t start_byte, |
1570 | loff_t length); |
1571 | extern int jbd2_journal_finish_inode_data_buffers( |
1572 | struct jbd2_inode *jinode); |
1573 | extern int jbd2_journal_begin_ordered_truncate(journal_t *journal, |
1574 | struct jbd2_inode *inode, loff_t new_size); |
1575 | extern void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode); |
1576 | extern void jbd2_journal_release_jbd_inode(journal_t *journal, struct jbd2_inode *jinode); |
1577 | |
1578 | /* |
1579 | * journal_head management |
1580 | */ |
1581 | struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh); |
1582 | struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh); |
1583 | void jbd2_journal_put_journal_head(struct journal_head *jh); |
1584 | |
1585 | /* |
1586 | * handle management |
1587 | */ |
1588 | extern struct kmem_cache *jbd2_handle_cache; |
1589 | |
1590 | static inline handle_t *jbd2_alloc_handle(gfp_t gfp_flags) |
1591 | { |
1592 | return kmem_cache_zalloc(k: jbd2_handle_cache, flags: gfp_flags); |
1593 | } |
1594 | |
1595 | static inline void jbd2_free_handle(handle_t *handle) |
1596 | { |
1597 | kmem_cache_free(s: jbd2_handle_cache, objp: handle); |
1598 | } |
1599 | |
1600 | /* |
1601 | * jbd2_inode management (optional, for those file systems that want to use |
1602 | * dynamically allocated jbd2_inode structures) |
1603 | */ |
1604 | extern struct kmem_cache *jbd2_inode_cache; |
1605 | |
1606 | static inline struct jbd2_inode *jbd2_alloc_inode(gfp_t gfp_flags) |
1607 | { |
1608 | return kmem_cache_alloc(cachep: jbd2_inode_cache, flags: gfp_flags); |
1609 | } |
1610 | |
1611 | static inline void jbd2_free_inode(struct jbd2_inode *jinode) |
1612 | { |
1613 | kmem_cache_free(s: jbd2_inode_cache, objp: jinode); |
1614 | } |
1615 | |
1616 | /* Primary revoke support */ |
1617 | #define JOURNAL_REVOKE_DEFAULT_HASH 256 |
1618 | extern int jbd2_journal_init_revoke(journal_t *, int); |
1619 | extern void jbd2_journal_destroy_revoke_record_cache(void); |
1620 | extern void jbd2_journal_destroy_revoke_table_cache(void); |
1621 | extern int __init jbd2_journal_init_revoke_record_cache(void); |
1622 | extern int __init jbd2_journal_init_revoke_table_cache(void); |
1623 | |
1624 | extern void jbd2_journal_destroy_revoke(journal_t *); |
1625 | extern int jbd2_journal_revoke (handle_t *, unsigned long long, struct buffer_head *); |
1626 | extern int jbd2_journal_cancel_revoke(handle_t *, struct journal_head *); |
1627 | extern void jbd2_journal_write_revoke_records(transaction_t *transaction, |
1628 | struct list_head *log_bufs); |
1629 | |
1630 | /* Recovery revoke support */ |
1631 | extern int jbd2_journal_set_revoke(journal_t *, unsigned long long, tid_t); |
1632 | extern int jbd2_journal_test_revoke(journal_t *, unsigned long long, tid_t); |
1633 | extern void jbd2_journal_clear_revoke(journal_t *); |
1634 | extern void jbd2_journal_switch_revoke_table(journal_t *journal); |
1635 | extern void jbd2_clear_buffer_revoked_flags(journal_t *journal); |
1636 | |
1637 | /* |
1638 | * The log thread user interface: |
1639 | * |
1640 | * Request space in the current transaction, and force transaction commit |
1641 | * transitions on demand. |
1642 | */ |
1643 | |
1644 | int jbd2_log_start_commit(journal_t *journal, tid_t tid); |
1645 | int jbd2_journal_start_commit(journal_t *journal, tid_t *tid); |
1646 | int jbd2_log_wait_commit(journal_t *journal, tid_t tid); |
1647 | int jbd2_transaction_committed(journal_t *journal, tid_t tid); |
1648 | int jbd2_complete_transaction(journal_t *journal, tid_t tid); |
1649 | int jbd2_log_do_checkpoint(journal_t *journal); |
1650 | int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid); |
1651 | |
1652 | void __jbd2_log_wait_for_space(journal_t *journal); |
1653 | extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *); |
1654 | extern int jbd2_cleanup_journal_tail(journal_t *); |
1655 | |
1656 | /* Fast commit related APIs */ |
1657 | int jbd2_fc_begin_commit(journal_t *journal, tid_t tid); |
1658 | int jbd2_fc_end_commit(journal_t *journal); |
1659 | int jbd2_fc_end_commit_fallback(journal_t *journal); |
1660 | int jbd2_fc_get_buf(journal_t *journal, struct buffer_head **bh_out); |
1661 | int jbd2_submit_inode_data(journal_t *journal, struct jbd2_inode *jinode); |
1662 | int jbd2_wait_inode_data(journal_t *journal, struct jbd2_inode *jinode); |
1663 | int jbd2_fc_wait_bufs(journal_t *journal, int num_blks); |
1664 | int jbd2_fc_release_bufs(journal_t *journal); |
1665 | |
1666 | static inline int jbd2_journal_get_max_txn_bufs(journal_t *journal) |
1667 | { |
1668 | return (journal->j_total_len - journal->j_fc_wbufsize) / 4; |
1669 | } |
1670 | |
1671 | /* |
1672 | * is_journal_abort |
1673 | * |
1674 | * Simple test wrapper function to test the JBD2_ABORT state flag. This |
1675 | * bit, when set, indicates that we have had a fatal error somewhere, |
1676 | * either inside the journaling layer or indicated to us by the client |
1677 | * (eg. ext3), and that we and should not commit any further |
1678 | * transactions. |
1679 | */ |
1680 | |
1681 | static inline int is_journal_aborted(journal_t *journal) |
1682 | { |
1683 | return journal->j_flags & JBD2_ABORT; |
1684 | } |
1685 | |
1686 | static inline int is_handle_aborted(handle_t *handle) |
1687 | { |
1688 | if (handle->h_aborted || !handle->h_transaction) |
1689 | return 1; |
1690 | return is_journal_aborted(journal: handle->h_transaction->t_journal); |
1691 | } |
1692 | |
1693 | static inline void jbd2_journal_abort_handle(handle_t *handle) |
1694 | { |
1695 | handle->h_aborted = 1; |
1696 | } |
1697 | |
1698 | #endif /* __KERNEL__ */ |
1699 | |
1700 | /* Comparison functions for transaction IDs: perform comparisons using |
1701 | * modulo arithmetic so that they work over sequence number wraps. */ |
1702 | |
1703 | static inline int tid_gt(tid_t x, tid_t y) |
1704 | { |
1705 | int difference = (x - y); |
1706 | return (difference > 0); |
1707 | } |
1708 | |
1709 | static inline int tid_geq(tid_t x, tid_t y) |
1710 | { |
1711 | int difference = (x - y); |
1712 | return (difference >= 0); |
1713 | } |
1714 | |
1715 | extern int jbd2_journal_blocks_per_page(struct inode *inode); |
1716 | extern size_t journal_tag_bytes(journal_t *journal); |
1717 | |
1718 | static inline bool jbd2_journal_has_csum_v2or3_feature(journal_t *j) |
1719 | { |
1720 | return jbd2_has_feature_csum2(j) || jbd2_has_feature_csum3(j); |
1721 | } |
1722 | |
1723 | static inline int jbd2_journal_has_csum_v2or3(journal_t *journal) |
1724 | { |
1725 | WARN_ON_ONCE(jbd2_journal_has_csum_v2or3_feature(journal) && |
1726 | journal->j_chksum_driver == NULL); |
1727 | |
1728 | return journal->j_chksum_driver != NULL; |
1729 | } |
1730 | |
1731 | static inline int jbd2_journal_get_num_fc_blks(journal_superblock_t *jsb) |
1732 | { |
1733 | int num_fc_blocks = be32_to_cpu(jsb->s_num_fc_blks); |
1734 | |
1735 | return num_fc_blocks ? num_fc_blocks : JBD2_DEFAULT_FAST_COMMIT_BLOCKS; |
1736 | } |
1737 | |
1738 | /* |
1739 | * Return number of free blocks in the log. Must be called under j_state_lock. |
1740 | */ |
1741 | static inline unsigned long jbd2_log_space_left(journal_t *journal) |
1742 | { |
1743 | /* Allow for rounding errors */ |
1744 | long free = journal->j_free - 32; |
1745 | |
1746 | if (journal->j_committing_transaction) { |
1747 | free -= atomic_read(v: &journal-> |
1748 | j_committing_transaction->t_outstanding_credits); |
1749 | } |
1750 | return max_t(long, free, 0); |
1751 | } |
1752 | |
1753 | /* |
1754 | * Definitions which augment the buffer_head layer |
1755 | */ |
1756 | |
1757 | /* journaling buffer types */ |
1758 | #define BJ_None 0 /* Not journaled */ |
1759 | #define BJ_Metadata 1 /* Normal journaled metadata */ |
1760 | #define BJ_Forget 2 /* Buffer superseded by this transaction */ |
1761 | #define BJ_Shadow 3 /* Buffer contents being shadowed to the log */ |
1762 | #define BJ_Reserved 4 /* Buffer is reserved for access by journal */ |
1763 | #define BJ_Types 5 |
1764 | |
1765 | /* JBD uses a CRC32 checksum */ |
1766 | #define JBD_MAX_CHECKSUM_SIZE 4 |
1767 | |
1768 | static inline u32 jbd2_chksum(journal_t *journal, u32 crc, |
1769 | const void *address, unsigned int length) |
1770 | { |
1771 | struct { |
1772 | struct shash_desc shash; |
1773 | char ctx[JBD_MAX_CHECKSUM_SIZE]; |
1774 | } desc; |
1775 | int err; |
1776 | |
1777 | BUG_ON(crypto_shash_descsize(journal->j_chksum_driver) > |
1778 | JBD_MAX_CHECKSUM_SIZE); |
1779 | |
1780 | desc.shash.tfm = journal->j_chksum_driver; |
1781 | *(u32 *)desc.ctx = crc; |
1782 | |
1783 | err = crypto_shash_update(desc: &desc.shash, data: address, len: length); |
1784 | BUG_ON(err); |
1785 | |
1786 | return *(u32 *)desc.ctx; |
1787 | } |
1788 | |
1789 | /* Return most recent uncommitted transaction */ |
1790 | static inline tid_t jbd2_get_latest_transaction(journal_t *journal) |
1791 | { |
1792 | tid_t tid; |
1793 | |
1794 | read_lock(&journal->j_state_lock); |
1795 | tid = journal->j_commit_request; |
1796 | if (journal->j_running_transaction) |
1797 | tid = journal->j_running_transaction->t_tid; |
1798 | read_unlock(&journal->j_state_lock); |
1799 | return tid; |
1800 | } |
1801 | |
1802 | static inline int jbd2_handle_buffer_credits(handle_t *handle) |
1803 | { |
1804 | journal_t *journal; |
1805 | |
1806 | if (!handle->h_reserved) |
1807 | journal = handle->h_transaction->t_journal; |
1808 | else |
1809 | journal = handle->h_journal; |
1810 | |
1811 | return handle->h_total_credits - |
1812 | DIV_ROUND_UP(handle->h_revoke_credits_requested, |
1813 | journal->j_revoke_records_per_block); |
1814 | } |
1815 | |
1816 | #ifdef __KERNEL__ |
1817 | |
1818 | #define buffer_trace_init(bh) do {} while (0) |
1819 | #define print_buffer_fields(bh) do {} while (0) |
1820 | #define print_buffer_trace(bh) do {} while (0) |
1821 | #define BUFFER_TRACE(bh, info) do {} while (0) |
1822 | #define BUFFER_TRACE2(bh, bh2, info) do {} while (0) |
1823 | #define JBUFFER_TRACE(jh, info) do {} while (0) |
1824 | |
1825 | #endif /* __KERNEL__ */ |
1826 | |
1827 | #define EFSBADCRC EBADMSG /* Bad CRC detected */ |
1828 | #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ |
1829 | |
1830 | #endif /* _LINUX_JBD2_H */ |
1831 | |