]>
Commit | Line | Data |
---|---|---|
470decc6 | 1 | /* |
f7f4bccb | 2 | * linux/include/linux/jbd2.h |
470decc6 DK |
3 | * |
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 | ||
cd02ff0b MC |
16 | #ifndef _LINUX_JBD2_H |
17 | #define _LINUX_JBD2_H | |
470decc6 DK |
18 | |
19 | /* Allow this file to be included directly into e2fsprogs */ | |
20 | #ifndef __KERNEL__ | |
21 | #include "jfs_compat.h" | |
f7f4bccb | 22 | #define JBD2_DEBUG |
470decc6 DK |
23 | #else |
24 | ||
25 | #include <linux/types.h> | |
26 | #include <linux/buffer_head.h> | |
27 | #include <linux/journal-head.h> | |
28 | #include <linux/stddef.h> | |
470decc6 DK |
29 | #include <linux/mutex.h> |
30 | #include <linux/timer.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
c290ea01 | 32 | #include <linux/bit_spinlock.h> |
01b5adce | 33 | #include <crypto/hash.h> |
470decc6 DK |
34 | #endif |
35 | ||
36 | #define journal_oom_retry 1 | |
37 | ||
38 | /* | |
cd02ff0b | 39 | * Define JBD2_PARANIOD_IOFAIL to cause a kernel BUG() if ext4 finds |
470decc6 | 40 | * certain classes of error which can occur due to failed IOs. Under |
cd02ff0b | 41 | * normal use we want ext4 to continue after such errors, because |
470decc6 DK |
42 | * hardware _can_ fail, but for debugging purposes when running tests on |
43 | * known-good hardware we may want to trap these errors. | |
44 | */ | |
cd02ff0b | 45 | #undef JBD2_PARANOID_IOFAIL |
470decc6 DK |
46 | |
47 | /* | |
48 | * The default maximum commit age, in seconds. | |
49 | */ | |
cd02ff0b | 50 | #define JBD2_DEFAULT_MAX_COMMIT_AGE 5 |
470decc6 | 51 | |
e23291b9 | 52 | #ifdef CONFIG_JBD2_DEBUG |
470decc6 | 53 | /* |
cd02ff0b | 54 | * Define JBD2_EXPENSIVE_CHECKING to enable more expensive internal |
470decc6 | 55 | * consistency checks. By default we don't do this unless |
e23291b9 | 56 | * CONFIG_JBD2_DEBUG is on. |
470decc6 | 57 | */ |
cd02ff0b | 58 | #define JBD2_EXPENSIVE_CHECKING |
b6e96d00 | 59 | extern ushort jbd2_journal_enable_debug; |
169f1a2a PG |
60 | void __jbd2_debug(int level, const char *file, const char *func, |
61 | unsigned int line, const char *fmt, ...); | |
470decc6 | 62 | |
169f1a2a PG |
63 | #define jbd_debug(n, fmt, a...) \ |
64 | __jbd2_debug((n), __FILE__, __func__, __LINE__, (fmt), ##a) | |
470decc6 | 65 | #else |
169f1a2a | 66 | #define jbd_debug(n, fmt, a...) /**/ |
470decc6 DK |
67 | #endif |
68 | ||
d2eecb03 TT |
69 | extern void *jbd2_alloc(size_t size, gfp_t flags); |
70 | extern void jbd2_free(void *ptr, size_t size); | |
af1e76d6 | 71 | |
f7f4bccb | 72 | #define JBD2_MIN_JOURNAL_BLOCKS 1024 |
470decc6 DK |
73 | |
74 | #ifdef __KERNEL__ | |
75 | ||
76 | /** | |
77 | * typedef handle_t - The handle_t type represents a single atomic update being performed by some process. | |
78 | * | |
79 | * All filesystem modifications made by the process go | |
80 | * through this handle. Recursive operations (such as quota operations) | |
81 | * are gathered into a single update. | |
82 | * | |
83 | * The buffer credits field is used to account for journaled buffers | |
84 | * being modified by the running process. To ensure that there is | |
85 | * enough log space for all outstanding operations, we need to limit the | |
86 | * number of outstanding buffers possible at any time. When the | |
87 | * operation completes, any buffer credits not used are credited back to | |
88 | * the transaction, so that at all times we know how many buffers the | |
89 | * outstanding updates on a transaction might possibly touch. | |
90 | * | |
91 | * This is an opaque datatype. | |
92 | **/ | |
8aefcd55 | 93 | typedef struct jbd2_journal_handle handle_t; /* Atomic operation type */ |
470decc6 DK |
94 | |
95 | ||
96 | /** | |
97 | * typedef journal_t - The journal_t maintains all of the journaling state information for a single filesystem. | |
98 | * | |
99 | * journal_t is linked to from the fs superblock structure. | |
100 | * | |
101 | * We use the journal_t to keep track of all outstanding transaction | |
102 | * activity on the filesystem, and to manage the state of the log | |
103 | * writing process. | |
104 | * | |
105 | * This is an opaque datatype. | |
106 | **/ | |
107 | typedef struct journal_s journal_t; /* Journal control structure */ | |
108 | #endif | |
109 | ||
110 | /* | |
111 | * Internal structures used by the logging mechanism: | |
112 | */ | |
113 | ||
f7f4bccb | 114 | #define JBD2_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */ |
470decc6 DK |
115 | |
116 | /* | |
117 | * On-disk structures | |
118 | */ | |
119 | ||
120 | /* | |
121 | * Descriptor block types: | |
122 | */ | |
123 | ||
f7f4bccb MC |
124 | #define JBD2_DESCRIPTOR_BLOCK 1 |
125 | #define JBD2_COMMIT_BLOCK 2 | |
126 | #define JBD2_SUPERBLOCK_V1 3 | |
127 | #define JBD2_SUPERBLOCK_V2 4 | |
128 | #define JBD2_REVOKE_BLOCK 5 | |
470decc6 DK |
129 | |
130 | /* | |
131 | * Standard header for all descriptor blocks: | |
132 | */ | |
133 | typedef struct journal_header_s | |
134 | { | |
135 | __be32 h_magic; | |
136 | __be32 h_blocktype; | |
137 | __be32 h_sequence; | |
138 | } journal_header_t; | |
139 | ||
818d276c GS |
140 | /* |
141 | * Checksum types. | |
142 | */ | |
143 | #define JBD2_CRC32_CHKSUM 1 | |
144 | #define JBD2_MD5_CHKSUM 2 | |
145 | #define JBD2_SHA1_CHKSUM 3 | |
8f888ef8 | 146 | #define JBD2_CRC32C_CHKSUM 4 |
818d276c GS |
147 | |
148 | #define JBD2_CRC32_CHKSUM_SIZE 4 | |
149 | ||
150 | #define JBD2_CHECKSUM_BYTES (32 / sizeof(u32)) | |
151 | /* | |
152 | * Commit block header for storing transactional checksums: | |
8f888ef8 DW |
153 | * |
154 | * NOTE: If FEATURE_COMPAT_CHECKSUM (checksum v1) is set, the h_chksum* | |
155 | * fields are used to store a checksum of the descriptor and data blocks. | |
156 | * | |
157 | * If FEATURE_INCOMPAT_CSUM_V2 (checksum v2) is set, then the h_chksum | |
158 | * field is used to store crc32c(uuid+commit_block). Each journal metadata | |
159 | * block gets its own checksum, and data block checksums are stored in | |
160 | * journal_block_tag (in the descriptor). The other h_chksum* fields are | |
161 | * not used. | |
162 | * | |
db9ee220 DW |
163 | * If FEATURE_INCOMPAT_CSUM_V3 is set, the descriptor block uses |
164 | * journal_block_tag3_t to store a full 32-bit checksum. Everything else | |
165 | * is the same as v2. | |
166 | * | |
167 | * Checksum v1, v2, and v3 are mutually exclusive features. | |
818d276c GS |
168 | */ |
169 | struct commit_header { | |
170 | __be32 h_magic; | |
171 | __be32 h_blocktype; | |
172 | __be32 h_sequence; | |
173 | unsigned char h_chksum_type; | |
174 | unsigned char h_chksum_size; | |
175 | unsigned char h_padding[2]; | |
176 | __be32 h_chksum[JBD2_CHECKSUM_BYTES]; | |
736603ab TT |
177 | __be64 h_commit_sec; |
178 | __be32 h_commit_nsec; | |
818d276c | 179 | }; |
470decc6 DK |
180 | |
181 | /* | |
b517bea1 ZB |
182 | * The block tag: used to describe a single buffer in the journal. |
183 | * t_blocknr_high is only used if INCOMPAT_64BIT is set, so this | |
184 | * raw struct shouldn't be used for pointer math or sizeof() - use | |
185 | * journal_tag_bytes(journal) instead to compute this. | |
470decc6 | 186 | */ |
db9ee220 DW |
187 | typedef struct journal_block_tag3_s |
188 | { | |
189 | __be32 t_blocknr; /* The on-disk block number */ | |
190 | __be32 t_flags; /* See below */ | |
191 | __be32 t_blocknr_high; /* most-significant high 32bits. */ | |
192 | __be32 t_checksum; /* crc32c(uuid+seq+block) */ | |
193 | } journal_block_tag3_t; | |
194 | ||
470decc6 DK |
195 | typedef struct journal_block_tag_s |
196 | { | |
197 | __be32 t_blocknr; /* The on-disk block number */ | |
8f888ef8 DW |
198 | __be16 t_checksum; /* truncated crc32c(uuid+seq+block) */ |
199 | __be16 t_flags; /* See below */ | |
b517bea1 | 200 | __be32 t_blocknr_high; /* most-significant high 32bits. */ |
470decc6 DK |
201 | } journal_block_tag_t; |
202 | ||
1101cd4d | 203 | /* Tail of descriptor or revoke block, for checksumming */ |
8f888ef8 DW |
204 | struct jbd2_journal_block_tail { |
205 | __be32 t_checksum; /* crc32c(uuid+descr_block) */ | |
206 | }; | |
207 | ||
470decc6 DK |
208 | /* |
209 | * The revoke descriptor: used on disk to describe a series of blocks to | |
210 | * be revoked from the log | |
211 | */ | |
f7f4bccb | 212 | typedef struct jbd2_journal_revoke_header_s |
470decc6 DK |
213 | { |
214 | journal_header_t r_header; | |
215 | __be32 r_count; /* Count of bytes used in the block */ | |
f7f4bccb | 216 | } jbd2_journal_revoke_header_t; |
470decc6 | 217 | |
470decc6 | 218 | /* Definitions for the journal tag flags word: */ |
f7f4bccb MC |
219 | #define JBD2_FLAG_ESCAPE 1 /* on-disk block is escaped */ |
220 | #define JBD2_FLAG_SAME_UUID 2 /* block has same uuid as previous */ | |
221 | #define JBD2_FLAG_DELETED 4 /* block deleted by this transaction */ | |
222 | #define JBD2_FLAG_LAST_TAG 8 /* last tag in this descriptor block */ | |
470decc6 DK |
223 | |
224 | ||
225 | /* | |
226 | * The journal superblock. All fields are in big-endian byte order. | |
227 | */ | |
228 | typedef struct journal_superblock_s | |
229 | { | |
230 | /* 0x0000 */ | |
231 | journal_header_t s_header; | |
232 | ||
233 | /* 0x000C */ | |
234 | /* Static information describing the journal */ | |
235 | __be32 s_blocksize; /* journal device blocksize */ | |
236 | __be32 s_maxlen; /* total blocks in journal file */ | |
237 | __be32 s_first; /* first block of log information */ | |
238 | ||
239 | /* 0x0018 */ | |
240 | /* Dynamic information describing the current state of the log */ | |
241 | __be32 s_sequence; /* first commit ID expected in log */ | |
242 | __be32 s_start; /* blocknr of start of log */ | |
243 | ||
244 | /* 0x0020 */ | |
f7f4bccb | 245 | /* Error value, as set by jbd2_journal_abort(). */ |
470decc6 DK |
246 | __be32 s_errno; |
247 | ||
248 | /* 0x0024 */ | |
249 | /* Remaining fields are only valid in a version-2 superblock */ | |
250 | __be32 s_feature_compat; /* compatible feature set */ | |
251 | __be32 s_feature_incompat; /* incompatible feature set */ | |
252 | __be32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
253 | /* 0x0030 */ | |
254 | __u8 s_uuid[16]; /* 128-bit uuid for journal */ | |
255 | ||
256 | /* 0x0040 */ | |
257 | __be32 s_nr_users; /* Nr of filesystems sharing log */ | |
258 | ||
259 | __be32 s_dynsuper; /* Blocknr of dynamic superblock copy*/ | |
260 | ||
261 | /* 0x0048 */ | |
262 | __be32 s_max_transaction; /* Limit of journal blocks per trans.*/ | |
263 | __be32 s_max_trans_data; /* Limit of data blocks per trans. */ | |
264 | ||
265 | /* 0x0050 */ | |
8f888ef8 DW |
266 | __u8 s_checksum_type; /* checksum type */ |
267 | __u8 s_padding2[3]; | |
268 | __u32 s_padding[42]; | |
269 | __be32 s_checksum; /* crc32c(superblock) */ | |
470decc6 DK |
270 | |
271 | /* 0x0100 */ | |
272 | __u8 s_users[16*48]; /* ids of all fs'es sharing the log */ | |
273 | /* 0x0400 */ | |
274 | } journal_superblock_t; | |
275 | ||
56316a0d | 276 | /* Use the jbd2_{has,set,clear}_feature_* helpers; these will be removed */ |
f7f4bccb | 277 | #define JBD2_HAS_COMPAT_FEATURE(j,mask) \ |
470decc6 DK |
278 | ((j)->j_format_version >= 2 && \ |
279 | ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask)))) | |
f7f4bccb | 280 | #define JBD2_HAS_RO_COMPAT_FEATURE(j,mask) \ |
470decc6 DK |
281 | ((j)->j_format_version >= 2 && \ |
282 | ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask)))) | |
f7f4bccb | 283 | #define JBD2_HAS_INCOMPAT_FEATURE(j,mask) \ |
470decc6 DK |
284 | ((j)->j_format_version >= 2 && \ |
285 | ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask)))) | |
286 | ||
56316a0d | 287 | #define JBD2_FEATURE_COMPAT_CHECKSUM 0x00000001 |
818d276c GS |
288 | |
289 | #define JBD2_FEATURE_INCOMPAT_REVOKE 0x00000001 | |
290 | #define JBD2_FEATURE_INCOMPAT_64BIT 0x00000002 | |
291 | #define JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT 0x00000004 | |
8f888ef8 | 292 | #define JBD2_FEATURE_INCOMPAT_CSUM_V2 0x00000008 |
db9ee220 | 293 | #define JBD2_FEATURE_INCOMPAT_CSUM_V3 0x00000010 |
470decc6 | 294 | |
56316a0d DW |
295 | /* See "journal feature predicate functions" below */ |
296 | ||
470decc6 | 297 | /* Features known to this kernel version: */ |
818d276c | 298 | #define JBD2_KNOWN_COMPAT_FEATURES JBD2_FEATURE_COMPAT_CHECKSUM |
f7f4bccb | 299 | #define JBD2_KNOWN_ROCOMPAT_FEATURES 0 |
b517bea1 | 300 | #define JBD2_KNOWN_INCOMPAT_FEATURES (JBD2_FEATURE_INCOMPAT_REVOKE | \ |
818d276c | 301 | JBD2_FEATURE_INCOMPAT_64BIT | \ |
e93376c2 | 302 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | \ |
db9ee220 DW |
303 | JBD2_FEATURE_INCOMPAT_CSUM_V2 | \ |
304 | JBD2_FEATURE_INCOMPAT_CSUM_V3) | |
470decc6 DK |
305 | |
306 | #ifdef __KERNEL__ | |
307 | ||
308 | #include <linux/fs.h> | |
309 | #include <linux/sched.h> | |
b34090e5 JK |
310 | |
311 | enum jbd_state_bits { | |
312 | BH_JBD /* Has an attached ext3 journal_head */ | |
313 | = BH_PrivateStart, | |
314 | BH_JWrite, /* Being written to log (@@@ DEBUGGING) */ | |
315 | BH_Freed, /* Has been freed (truncated) */ | |
316 | BH_Revoked, /* Has been revoked from the log */ | |
317 | BH_RevokeValid, /* Revoked flag is valid */ | |
318 | BH_JBDDirty, /* Is dirty but journaled */ | |
319 | BH_State, /* Pins most journal_head state */ | |
320 | BH_JournalHead, /* Pins bh->b_private and jh->b_bh */ | |
321 | BH_Shadow, /* IO on shadow buffer is running */ | |
322 | BH_Verified, /* Metadata block has been verified ok */ | |
323 | BH_JBDPrivateStart, /* First bit available for private use by FS */ | |
324 | }; | |
325 | ||
326 | BUFFER_FNS(JBD, jbd) | |
327 | BUFFER_FNS(JWrite, jwrite) | |
328 | BUFFER_FNS(JBDDirty, jbddirty) | |
329 | TAS_BUFFER_FNS(JBDDirty, jbddirty) | |
330 | BUFFER_FNS(Revoked, revoked) | |
331 | TAS_BUFFER_FNS(Revoked, revoked) | |
332 | BUFFER_FNS(RevokeValid, revokevalid) | |
333 | TAS_BUFFER_FNS(RevokeValid, revokevalid) | |
334 | BUFFER_FNS(Freed, freed) | |
335 | BUFFER_FNS(Shadow, shadow) | |
336 | BUFFER_FNS(Verified, verified) | |
337 | ||
c290ea01 JK |
338 | static inline struct buffer_head *jh2bh(struct journal_head *jh) |
339 | { | |
340 | return jh->b_bh; | |
341 | } | |
342 | ||
343 | static inline struct journal_head *bh2jh(struct buffer_head *bh) | |
344 | { | |
345 | return bh->b_private; | |
346 | } | |
347 | ||
348 | static inline void jbd_lock_bh_state(struct buffer_head *bh) | |
349 | { | |
350 | bit_spin_lock(BH_State, &bh->b_state); | |
351 | } | |
352 | ||
353 | static inline int jbd_trylock_bh_state(struct buffer_head *bh) | |
354 | { | |
355 | return bit_spin_trylock(BH_State, &bh->b_state); | |
356 | } | |
357 | ||
358 | static inline int jbd_is_locked_bh_state(struct buffer_head *bh) | |
359 | { | |
360 | return bit_spin_is_locked(BH_State, &bh->b_state); | |
361 | } | |
362 | ||
363 | static inline void jbd_unlock_bh_state(struct buffer_head *bh) | |
364 | { | |
365 | bit_spin_unlock(BH_State, &bh->b_state); | |
366 | } | |
367 | ||
368 | static inline void jbd_lock_bh_journal_head(struct buffer_head *bh) | |
369 | { | |
370 | bit_spin_lock(BH_JournalHead, &bh->b_state); | |
371 | } | |
372 | ||
373 | static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh) | |
374 | { | |
375 | bit_spin_unlock(BH_JournalHead, &bh->b_state); | |
376 | } | |
470decc6 | 377 | |
36df53f4 | 378 | #define J_ASSERT(assert) BUG_ON(!(assert)) |
470decc6 | 379 | |
470decc6 DK |
380 | #define J_ASSERT_BH(bh, expr) J_ASSERT(expr) |
381 | #define J_ASSERT_JH(jh, expr) J_ASSERT(expr) | |
470decc6 | 382 | |
cd02ff0b | 383 | #if defined(JBD2_PARANOID_IOFAIL) |
470decc6 DK |
384 | #define J_EXPECT(expr, why...) J_ASSERT(expr) |
385 | #define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr) | |
386 | #define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr) | |
387 | #else | |
388 | #define __journal_expect(expr, why...) \ | |
389 | ({ \ | |
390 | int val = (expr); \ | |
391 | if (!val) { \ | |
392 | printk(KERN_ERR \ | |
08ec8c38 TT |
393 | "JBD2 unexpected failure: %s: %s;\n", \ |
394 | __func__, #expr); \ | |
470decc6 DK |
395 | printk(KERN_ERR why "\n"); \ |
396 | } \ | |
397 | val; \ | |
398 | }) | |
399 | #define J_EXPECT(expr, why...) __journal_expect(expr, ## why) | |
400 | #define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why) | |
401 | #define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why) | |
402 | #endif | |
403 | ||
c851ed54 JK |
404 | /* Flags in jbd_inode->i_flags */ |
405 | #define __JI_COMMIT_RUNNING 0 | |
41617e1a JK |
406 | #define __JI_WRITE_DATA 1 |
407 | #define __JI_WAIT_DATA 2 | |
408 | ||
409 | /* | |
410 | * Commit of the inode data in progress. We use this flag to protect us from | |
c851ed54 JK |
411 | * concurrent deletion of inode. We cannot use reference to inode for this |
412 | * since we cannot afford doing last iput() on behalf of kjournald | |
413 | */ | |
414 | #define JI_COMMIT_RUNNING (1 << __JI_COMMIT_RUNNING) | |
41617e1a JK |
415 | /* Write allocated dirty buffers in this inode before commit */ |
416 | #define JI_WRITE_DATA (1 << __JI_WRITE_DATA) | |
417 | /* Wait for outstanding data writes for this inode before commit */ | |
418 | #define JI_WAIT_DATA (1 << __JI_WAIT_DATA) | |
c851ed54 JK |
419 | |
420 | /** | |
421 | * struct jbd_inode is the structure linking inodes in ordered mode | |
422 | * present in a transaction so that we can sync them during commit. | |
423 | */ | |
424 | struct jbd2_inode { | |
425 | /* Which transaction does this inode belong to? Either the running | |
426 | * transaction or the committing one. [j_list_lock] */ | |
427 | transaction_t *i_transaction; | |
428 | ||
429 | /* Pointer to the running transaction modifying inode's data in case | |
430 | * there is already a committing transaction touching it. [j_list_lock] */ | |
431 | transaction_t *i_next_transaction; | |
432 | ||
433 | /* List of inodes in the i_transaction [j_list_lock] */ | |
434 | struct list_head i_list; | |
435 | ||
436 | /* VFS inode this inode belongs to [constant during the lifetime | |
437 | * of the structure] */ | |
438 | struct inode *i_vfs_inode; | |
439 | ||
440 | /* Flags of inode [j_list_lock] */ | |
39e3ac25 | 441 | unsigned long i_flags; |
c851ed54 JK |
442 | }; |
443 | ||
f7f4bccb | 444 | struct jbd2_revoke_table_s; |
470decc6 DK |
445 | |
446 | /** | |
447 | * struct handle_s - The handle_s type is the concrete type associated with | |
448 | * handle_t. | |
449 | * @h_transaction: Which compound transaction is this update a part of? | |
450 | * @h_buffer_credits: Number of remaining buffers we are allowed to dirty. | |
451 | * @h_ref: Reference count on this handle | |
452 | * @h_err: Field for caller's use to track errors through large fs operations | |
453 | * @h_sync: flag for sync-on-close | |
454 | * @h_jdata: flag to force data journaling | |
455 | * @h_aborted: flag indicating fatal error on handle | |
456 | **/ | |
457 | ||
458 | /* Docbook can't yet cope with the bit fields, but will leave the documentation | |
459 | * in so it can be fixed later. | |
460 | */ | |
461 | ||
8aefcd55 | 462 | struct jbd2_journal_handle |
470decc6 | 463 | { |
8f7d89f3 JK |
464 | union { |
465 | /* Which compound transaction is this update a part of? */ | |
466 | transaction_t *h_transaction; | |
467 | /* Which journal handle belongs to - used iff h_reserved set */ | |
468 | journal_t *h_journal; | |
469 | }; | |
470 | ||
471 | /* Handle reserved for finishing the logical operation */ | |
472 | handle_t *h_rsv_handle; | |
470decc6 DK |
473 | |
474 | /* Number of remaining buffers we are allowed to dirty: */ | |
475 | int h_buffer_credits; | |
476 | ||
477 | /* Reference count on this handle */ | |
478 | int h_ref; | |
479 | ||
480 | /* Field for caller's use to track errors through large fs */ | |
481 | /* operations */ | |
482 | int h_err; | |
483 | ||
484 | /* Flags [no locking] */ | |
078d5039 TT |
485 | unsigned int h_sync: 1; /* sync-on-close */ |
486 | unsigned int h_jdata: 1; /* force data journaling */ | |
8f7d89f3 | 487 | unsigned int h_reserved: 1; /* handle with reserved credits */ |
078d5039 | 488 | unsigned int h_aborted: 1; /* fatal error on handle */ |
343d9c28 TT |
489 | unsigned int h_type: 8; /* for handle statistics */ |
490 | unsigned int h_line_no: 16; /* for handle statistics */ | |
491 | ||
492 | unsigned long h_start_jiffies; | |
493 | unsigned int h_requested_credits; | |
470decc6 DK |
494 | }; |
495 | ||
496 | ||
8e85fb3f JL |
497 | /* |
498 | * Some stats for checkpoint phase | |
499 | */ | |
500 | struct transaction_chp_stats_s { | |
501 | unsigned long cs_chp_time; | |
bf699327 TT |
502 | __u32 cs_forced_to_close; |
503 | __u32 cs_written; | |
504 | __u32 cs_dropped; | |
8e85fb3f JL |
505 | }; |
506 | ||
470decc6 DK |
507 | /* The transaction_t type is the guts of the journaling mechanism. It |
508 | * tracks a compound transaction through its various states: | |
509 | * | |
510 | * RUNNING: accepting new updates | |
511 | * LOCKED: Updates still running but we don't accept new ones | |
512 | * RUNDOWN: Updates are tidying up but have finished requesting | |
513 | * new buffers to modify (state not used for now) | |
514 | * FLUSH: All updates complete, but we are still writing to disk | |
515 | * COMMIT: All data on disk, writing commit record | |
516 | * FINISHED: We still have to keep the transaction for checkpointing. | |
517 | * | |
518 | * The transaction keeps track of all of the buffers modified by a | |
519 | * running transaction, and all of the buffers committed but not yet | |
520 | * flushed to home for finished transactions. | |
521 | */ | |
522 | ||
523 | /* | |
524 | * Lock ranking: | |
525 | * | |
526 | * j_list_lock | |
527 | * ->jbd_lock_bh_journal_head() (This is "innermost") | |
528 | * | |
529 | * j_state_lock | |
530 | * ->jbd_lock_bh_state() | |
531 | * | |
532 | * jbd_lock_bh_state() | |
533 | * ->j_list_lock | |
534 | * | |
535 | * j_state_lock | |
536 | * ->t_handle_lock | |
537 | * | |
538 | * j_state_lock | |
539 | * ->j_list_lock (journal_unmap_buffer) | |
540 | * | |
541 | */ | |
542 | ||
543 | struct transaction_s | |
544 | { | |
545 | /* Pointer to the journal for this transaction. [no locking] */ | |
546 | journal_t *t_journal; | |
547 | ||
548 | /* Sequence number for this transaction [no locking] */ | |
549 | tid_t t_tid; | |
550 | ||
551 | /* | |
552 | * Transaction's current state | |
f7f4bccb | 553 | * [no locking - only kjournald2 alters this] |
f5a7a6b0 JK |
554 | * [j_list_lock] guards transition of a transaction into T_FINISHED |
555 | * state and subsequent call of __jbd2_journal_drop_transaction() | |
470decc6 DK |
556 | * FIXME: needs barriers |
557 | * KLUDGE: [use j_state_lock] | |
558 | */ | |
559 | enum { | |
560 | T_RUNNING, | |
561 | T_LOCKED, | |
470decc6 DK |
562 | T_FLUSH, |
563 | T_COMMIT, | |
bbd2be36 JK |
564 | T_COMMIT_DFLUSH, |
565 | T_COMMIT_JFLUSH, | |
794446c6 | 566 | T_COMMIT_CALLBACK, |
470decc6 DK |
567 | T_FINISHED |
568 | } t_state; | |
569 | ||
570 | /* | |
571 | * Where in the log does this transaction's commit start? [no locking] | |
572 | */ | |
573 | unsigned long t_log_start; | |
574 | ||
575 | /* Number of buffers on the t_buffers list [j_list_lock] */ | |
576 | int t_nr_buffers; | |
577 | ||
578 | /* | |
579 | * Doubly-linked circular list of all buffers reserved but not yet | |
580 | * modified by this transaction [j_list_lock] | |
581 | */ | |
582 | struct journal_head *t_reserved_list; | |
583 | ||
470decc6 DK |
584 | /* |
585 | * Doubly-linked circular list of all metadata buffers owned by this | |
586 | * transaction [j_list_lock] | |
587 | */ | |
588 | struct journal_head *t_buffers; | |
589 | ||
470decc6 DK |
590 | /* |
591 | * Doubly-linked circular list of all forget buffers (superseded | |
592 | * buffers which we can un-checkpoint once this transaction commits) | |
593 | * [j_list_lock] | |
594 | */ | |
595 | struct journal_head *t_forget; | |
596 | ||
597 | /* | |
598 | * Doubly-linked circular list of all buffers still to be flushed before | |
599 | * this transaction can be checkpointed. [j_list_lock] | |
600 | */ | |
601 | struct journal_head *t_checkpoint_list; | |
602 | ||
603 | /* | |
604 | * Doubly-linked circular list of all buffers submitted for IO while | |
605 | * checkpointing. [j_list_lock] | |
606 | */ | |
607 | struct journal_head *t_checkpoint_io_list; | |
608 | ||
470decc6 DK |
609 | /* |
610 | * Doubly-linked circular list of metadata buffers being shadowed by log | |
611 | * IO. The IO buffers on the iobuf list and the shadow buffers on this | |
612 | * list match each other one for one at all times. [j_list_lock] | |
613 | */ | |
614 | struct journal_head *t_shadow_list; | |
615 | ||
c851ed54 JK |
616 | /* |
617 | * List of inodes whose data we've modified in data=ordered mode. | |
618 | * [j_list_lock] | |
619 | */ | |
620 | struct list_head t_inode_list; | |
621 | ||
470decc6 DK |
622 | /* |
623 | * Protects info related to handles | |
624 | */ | |
625 | spinlock_t t_handle_lock; | |
626 | ||
8e85fb3f JL |
627 | /* |
628 | * Longest time some handle had to wait for running transaction | |
629 | */ | |
630 | unsigned long t_max_wait; | |
631 | ||
632 | /* | |
633 | * When transaction started | |
634 | */ | |
635 | unsigned long t_start; | |
636 | ||
9fff24aa TT |
637 | /* |
638 | * When commit was requested | |
639 | */ | |
640 | unsigned long t_requested; | |
641 | ||
8e85fb3f JL |
642 | /* |
643 | * Checkpointing stats [j_checkpoint_sem] | |
644 | */ | |
645 | struct transaction_chp_stats_s t_chp_stats; | |
646 | ||
470decc6 DK |
647 | /* |
648 | * Number of outstanding updates running on this transaction | |
649 | * [t_handle_lock] | |
650 | */ | |
a51dca9c | 651 | atomic_t t_updates; |
470decc6 DK |
652 | |
653 | /* | |
654 | * Number of buffers reserved for use by all handles in this transaction | |
655 | * handle but not yet modified. [t_handle_lock] | |
656 | */ | |
a51dca9c | 657 | atomic_t t_outstanding_credits; |
470decc6 DK |
658 | |
659 | /* | |
660 | * Forward and backward links for the circular list of all transactions | |
661 | * awaiting checkpoint. [j_list_lock] | |
662 | */ | |
663 | transaction_t *t_cpnext, *t_cpprev; | |
664 | ||
665 | /* | |
666 | * When will the transaction expire (become due for commit), in jiffies? | |
667 | * [no locking] | |
668 | */ | |
669 | unsigned long t_expires; | |
670 | ||
e07f7183 JB |
671 | /* |
672 | * When this transaction started, in nanoseconds [no locking] | |
673 | */ | |
674 | ktime_t t_start_time; | |
675 | ||
470decc6 DK |
676 | /* |
677 | * How many handles used this transaction? [t_handle_lock] | |
678 | */ | |
8dd42046 | 679 | atomic_t t_handle_count; |
470decc6 | 680 | |
7058548c TT |
681 | /* |
682 | * This transaction is being forced and some process is | |
683 | * waiting for it to finish. | |
684 | */ | |
0ccff1a4 | 685 | unsigned int t_synchronous_commit:1; |
81be12c8 JK |
686 | |
687 | /* Disk flush needs to be sent to fs partition [no locking] */ | |
688 | int t_need_data_flush; | |
7058548c | 689 | |
3e624fc7 TT |
690 | /* |
691 | * For use by the filesystem to store fs-specific data | |
692 | * structures associated with the transaction | |
693 | */ | |
694 | struct list_head t_private_list; | |
470decc6 DK |
695 | }; |
696 | ||
8e85fb3f JL |
697 | struct transaction_run_stats_s { |
698 | unsigned long rs_wait; | |
9fff24aa | 699 | unsigned long rs_request_delay; |
8e85fb3f JL |
700 | unsigned long rs_running; |
701 | unsigned long rs_locked; | |
702 | unsigned long rs_flushing; | |
703 | unsigned long rs_logging; | |
704 | ||
bf699327 TT |
705 | __u32 rs_handle_count; |
706 | __u32 rs_blocks; | |
707 | __u32 rs_blocks_logged; | |
8e85fb3f JL |
708 | }; |
709 | ||
710 | struct transaction_stats_s { | |
8e85fb3f | 711 | unsigned long ts_tid; |
9fff24aa | 712 | unsigned long ts_requested; |
bf699327 | 713 | struct transaction_run_stats_s run; |
8e85fb3f JL |
714 | }; |
715 | ||
8e85fb3f JL |
716 | static inline unsigned long |
717 | jbd2_time_diff(unsigned long start, unsigned long end) | |
718 | { | |
719 | if (end >= start) | |
720 | return end - start; | |
721 | ||
722 | return end + (MAX_JIFFY_OFFSET - start); | |
723 | } | |
724 | ||
1a0d3786 TT |
725 | #define JBD2_NR_BATCH 64 |
726 | ||
470decc6 DK |
727 | /** |
728 | * struct journal_s - The journal_s type is the concrete type associated with | |
729 | * journal_t. | |
730 | * @j_flags: General journaling state flags | |
731 | * @j_errno: Is there an outstanding uncleared error on the journal (from a | |
732 | * prior abort)? | |
733 | * @j_sb_buffer: First part of superblock buffer | |
734 | * @j_superblock: Second part of superblock buffer | |
735 | * @j_format_version: Version of the superblock format | |
736 | * @j_state_lock: Protect the various scalars in the journal | |
737 | * @j_barrier_count: Number of processes waiting to create a barrier lock | |
738 | * @j_barrier: The barrier lock itself | |
739 | * @j_running_transaction: The current running transaction.. | |
740 | * @j_committing_transaction: the transaction we are pushing to disk | |
741 | * @j_checkpoint_transactions: a linked circular list of all transactions | |
742 | * waiting for checkpointing | |
743 | * @j_wait_transaction_locked: Wait queue for waiting for a locked transaction | |
744 | * to start committing, or for a barrier lock to be released | |
470decc6 | 745 | * @j_wait_done_commit: Wait queue for waiting for commit to complete |
470decc6 DK |
746 | * @j_wait_commit: Wait queue to trigger commit |
747 | * @j_wait_updates: Wait queue to wait for updates to complete | |
8f7d89f3 | 748 | * @j_wait_reserved: Wait queue to wait for reserved buffer credits to drop |
470decc6 DK |
749 | * @j_checkpoint_mutex: Mutex for locking against concurrent checkpoints |
750 | * @j_head: Journal head - identifies the first unused block in the journal | |
751 | * @j_tail: Journal tail - identifies the oldest still-used block in the | |
752 | * journal. | |
753 | * @j_free: Journal free - how many free blocks are there in the journal? | |
754 | * @j_first: The block number of the first usable block | |
755 | * @j_last: The block number one beyond the last usable block | |
756 | * @j_dev: Device where we store the journal | |
757 | * @j_blocksize: blocksize for the location where we store the journal. | |
758 | * @j_blk_offset: starting block offset for into the device where we store the | |
759 | * journal | |
760 | * @j_fs_dev: Device which holds the client fs. For internal journal this will | |
761 | * be equal to j_dev | |
8f7d89f3 | 762 | * @j_reserved_credits: Number of buffers reserved from the running transaction |
470decc6 DK |
763 | * @j_maxlen: Total maximum capacity of the journal region on disk. |
764 | * @j_list_lock: Protects the buffer lists and internal buffer state. | |
765 | * @j_inode: Optional inode where we store the journal. If present, all journal | |
766 | * block numbers are mapped into this inode via bmap(). | |
767 | * @j_tail_sequence: Sequence number of the oldest transaction in the log | |
768 | * @j_transaction_sequence: Sequence number of the next transaction to grant | |
769 | * @j_commit_sequence: Sequence number of the most recently committed | |
770 | * transaction | |
771 | * @j_commit_request: Sequence number of the most recent transaction wanting | |
772 | * commit | |
773 | * @j_uuid: Uuid of client object. | |
774 | * @j_task: Pointer to the current commit thread for this journal | |
775 | * @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a | |
776 | * single compound commit transaction | |
777 | * @j_commit_interval: What is the maximum transaction lifetime before we begin | |
778 | * a commit? | |
779 | * @j_commit_timer: The timer used to wakeup the commit thread | |
780 | * @j_revoke_lock: Protect the revoke table | |
781 | * @j_revoke: The revoke table - maintains the list of revoked blocks in the | |
782 | * current transaction. | |
783 | * @j_revoke_table: alternate revoke tables for j_revoke | |
f7f4bccb | 784 | * @j_wbuf: array of buffer_heads for jbd2_journal_commit_transaction |
470decc6 DK |
785 | * @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the |
786 | * number that will fit in j_blocksize | |
787 | * @j_last_sync_writer: most recent pid which did a synchronous write | |
8e85fb3f JL |
788 | * @j_history_lock: Protect the transactions statistics history |
789 | * @j_proc_entry: procfs entry for the jbd statistics directory | |
790 | * @j_stats: Overall statistics | |
470decc6 | 791 | * @j_private: An opaque pointer to fs-private information. |
ab714aff | 792 | * @j_trans_commit_map: Lockdep entity to track transaction commit dependencies |
470decc6 DK |
793 | */ |
794 | ||
795 | struct journal_s | |
796 | { | |
797 | /* General journaling state flags [j_state_lock] */ | |
798 | unsigned long j_flags; | |
799 | ||
800 | /* | |
801 | * Is there an outstanding uncleared error on the journal (from a prior | |
802 | * abort)? [j_state_lock] | |
803 | */ | |
804 | int j_errno; | |
805 | ||
806 | /* The superblock buffer */ | |
807 | struct buffer_head *j_sb_buffer; | |
808 | journal_superblock_t *j_superblock; | |
809 | ||
810 | /* Version of the superblock format */ | |
811 | int j_format_version; | |
812 | ||
813 | /* | |
814 | * Protect the various scalars in the journal | |
815 | */ | |
a931da6a | 816 | rwlock_t j_state_lock; |
470decc6 DK |
817 | |
818 | /* | |
819 | * Number of processes waiting to create a barrier lock [j_state_lock] | |
820 | */ | |
821 | int j_barrier_count; | |
822 | ||
823 | /* The barrier lock itself */ | |
824 | struct mutex j_barrier; | |
825 | ||
826 | /* | |
827 | * Transactions: The current running transaction... | |
828 | * [j_state_lock] [caller holding open handle] | |
829 | */ | |
830 | transaction_t *j_running_transaction; | |
831 | ||
832 | /* | |
833 | * the transaction we are pushing to disk | |
834 | * [j_state_lock] [caller holding open handle] | |
835 | */ | |
836 | transaction_t *j_committing_transaction; | |
837 | ||
838 | /* | |
839 | * ... and a linked circular list of all transactions waiting for | |
840 | * checkpointing. [j_list_lock] | |
841 | */ | |
842 | transaction_t *j_checkpoint_transactions; | |
843 | ||
844 | /* | |
845 | * Wait queue for waiting for a locked transaction to start committing, | |
846 | * or for a barrier lock to be released | |
847 | */ | |
848 | wait_queue_head_t j_wait_transaction_locked; | |
849 | ||
470decc6 DK |
850 | /* Wait queue for waiting for commit to complete */ |
851 | wait_queue_head_t j_wait_done_commit; | |
852 | ||
470decc6 DK |
853 | /* Wait queue to trigger commit */ |
854 | wait_queue_head_t j_wait_commit; | |
855 | ||
856 | /* Wait queue to wait for updates to complete */ | |
857 | wait_queue_head_t j_wait_updates; | |
858 | ||
8f7d89f3 JK |
859 | /* Wait queue to wait for reserved buffer credits to drop */ |
860 | wait_queue_head_t j_wait_reserved; | |
861 | ||
470decc6 DK |
862 | /* Semaphore for locking against concurrent checkpoints */ |
863 | struct mutex j_checkpoint_mutex; | |
864 | ||
1a0d3786 TT |
865 | /* |
866 | * List of buffer heads used by the checkpoint routine. This | |
867 | * was moved from jbd2_log_do_checkpoint() to reduce stack | |
868 | * usage. Access to this array is controlled by the | |
869 | * j_checkpoint_mutex. [j_checkpoint_mutex] | |
870 | */ | |
871 | struct buffer_head *j_chkpt_bhs[JBD2_NR_BATCH]; | |
872 | ||
470decc6 DK |
873 | /* |
874 | * Journal head: identifies the first unused block in the journal. | |
875 | * [j_state_lock] | |
876 | */ | |
877 | unsigned long j_head; | |
878 | ||
879 | /* | |
880 | * Journal tail: identifies the oldest still-used block in the journal. | |
881 | * [j_state_lock] | |
882 | */ | |
883 | unsigned long j_tail; | |
884 | ||
885 | /* | |
886 | * Journal free: how many free blocks are there in the journal? | |
887 | * [j_state_lock] | |
888 | */ | |
889 | unsigned long j_free; | |
890 | ||
891 | /* | |
892 | * Journal start and end: the block numbers of the first usable block | |
893 | * and one beyond the last usable block in the journal. [j_state_lock] | |
894 | */ | |
895 | unsigned long j_first; | |
896 | unsigned long j_last; | |
897 | ||
898 | /* | |
899 | * Device, blocksize and starting block offset for the location where we | |
900 | * store the journal. | |
901 | */ | |
902 | struct block_device *j_dev; | |
903 | int j_blocksize; | |
05496769 TT |
904 | unsigned long long j_blk_offset; |
905 | char j_devname[BDEVNAME_SIZE+24]; | |
470decc6 DK |
906 | |
907 | /* | |
908 | * Device which holds the client fs. For internal journal this will be | |
909 | * equal to j_dev. | |
910 | */ | |
911 | struct block_device *j_fs_dev; | |
912 | ||
913 | /* Total maximum capacity of the journal region on disk. */ | |
914 | unsigned int j_maxlen; | |
915 | ||
8f7d89f3 JK |
916 | /* Number of buffers reserved from the running transaction */ |
917 | atomic_t j_reserved_credits; | |
918 | ||
470decc6 DK |
919 | /* |
920 | * Protects the buffer lists and internal buffer state. | |
921 | */ | |
922 | spinlock_t j_list_lock; | |
923 | ||
924 | /* Optional inode where we store the journal. If present, all */ | |
925 | /* journal block numbers are mapped into this inode via */ | |
926 | /* bmap(). */ | |
927 | struct inode *j_inode; | |
928 | ||
929 | /* | |
930 | * Sequence number of the oldest transaction in the log [j_state_lock] | |
931 | */ | |
932 | tid_t j_tail_sequence; | |
933 | ||
934 | /* | |
935 | * Sequence number of the next transaction to grant [j_state_lock] | |
936 | */ | |
937 | tid_t j_transaction_sequence; | |
938 | ||
939 | /* | |
940 | * Sequence number of the most recently committed transaction | |
941 | * [j_state_lock]. | |
942 | */ | |
943 | tid_t j_commit_sequence; | |
944 | ||
945 | /* | |
946 | * Sequence number of the most recent transaction wanting commit | |
947 | * [j_state_lock] | |
948 | */ | |
949 | tid_t j_commit_request; | |
950 | ||
951 | /* | |
952 | * Journal uuid: identifies the object (filesystem, LVM volume etc) | |
953 | * backed by this journal. This will eventually be replaced by an array | |
954 | * of uuids, allowing us to index multiple devices within a single | |
955 | * journal and to perform atomic updates across them. | |
956 | */ | |
957 | __u8 j_uuid[16]; | |
958 | ||
959 | /* Pointer to the current commit thread for this journal */ | |
960 | struct task_struct *j_task; | |
961 | ||
962 | /* | |
963 | * Maximum number of metadata buffers to allow in a single compound | |
964 | * commit transaction | |
965 | */ | |
966 | int j_max_transaction_buffers; | |
967 | ||
968 | /* | |
969 | * What is the maximum transaction lifetime before we begin a commit? | |
970 | */ | |
971 | unsigned long j_commit_interval; | |
972 | ||
973 | /* The timer used to wakeup the commit thread: */ | |
974 | struct timer_list j_commit_timer; | |
975 | ||
976 | /* | |
977 | * The revoke table: maintains the list of revoked blocks in the | |
978 | * current transaction. [j_revoke_lock] | |
979 | */ | |
980 | spinlock_t j_revoke_lock; | |
f7f4bccb MC |
981 | struct jbd2_revoke_table_s *j_revoke; |
982 | struct jbd2_revoke_table_s *j_revoke_table[2]; | |
470decc6 DK |
983 | |
984 | /* | |
f7f4bccb | 985 | * array of bhs for jbd2_journal_commit_transaction |
470decc6 DK |
986 | */ |
987 | struct buffer_head **j_wbuf; | |
988 | int j_wbufsize; | |
989 | ||
e07f7183 JB |
990 | /* |
991 | * this is the pid of hte last person to run a synchronous operation | |
992 | * through the journal | |
993 | */ | |
470decc6 DK |
994 | pid_t j_last_sync_writer; |
995 | ||
e07f7183 JB |
996 | /* |
997 | * the average amount of time in nanoseconds it takes to commit a | |
998 | * transaction to disk. [j_state_lock] | |
999 | */ | |
1000 | u64 j_average_commit_time; | |
1001 | ||
30773840 TT |
1002 | /* |
1003 | * minimum and maximum times that we should wait for | |
1004 | * additional filesystem operations to get batched into a | |
1005 | * synchronous handle in microseconds | |
1006 | */ | |
1007 | u32 j_min_batch_time; | |
1008 | u32 j_max_batch_time; | |
1009 | ||
3e624fc7 TT |
1010 | /* This function is called when a transaction is closed */ |
1011 | void (*j_commit_callback)(journal_t *, | |
1012 | transaction_t *); | |
1013 | ||
470decc6 | 1014 | /* |
8e85fb3f JL |
1015 | * Journal statistics |
1016 | */ | |
8e85fb3f JL |
1017 | spinlock_t j_history_lock; |
1018 | struct proc_dir_entry *j_proc_entry; | |
1019 | struct transaction_stats_s j_stats; | |
1020 | ||
624080ed TT |
1021 | /* Failed journal commit ID */ |
1022 | unsigned int j_failed_commit; | |
1023 | ||
8e85fb3f | 1024 | /* |
470decc6 DK |
1025 | * An opaque pointer to fs-private information. ext3 puts its |
1026 | * superblock pointer here | |
1027 | */ | |
1028 | void *j_private; | |
01b5adce DW |
1029 | |
1030 | /* Reference to checksum algorithm driver via cryptoapi */ | |
1031 | struct crypto_shash *j_chksum_driver; | |
4fd5ea43 DW |
1032 | |
1033 | /* Precomputed journal UUID checksum for seeding other checksums */ | |
1034 | __u32 j_csum_seed; | |
ab714aff JK |
1035 | |
1036 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
1037 | /* | |
1038 | * Lockdep entity to track transaction commit dependencies. Handles | |
1039 | * hold this "lock" for read, when we wait for commit, we acquire the | |
1040 | * "lock" for writing. This matches the properties of jbd2 journalling | |
1041 | * where the running transaction has to wait for all handles to be | |
1042 | * dropped to commit that transaction and also acquiring a handle may | |
1043 | * require transaction commit to finish. | |
1044 | */ | |
1045 | struct lockdep_map j_trans_commit_map; | |
1046 | #endif | |
470decc6 DK |
1047 | }; |
1048 | ||
1eaa566d JK |
1049 | #define jbd2_might_wait_for_commit(j) \ |
1050 | do { \ | |
1051 | rwsem_acquire(&j->j_trans_commit_map, 0, 0, _THIS_IP_); \ | |
1052 | rwsem_release(&j->j_trans_commit_map, 1, _THIS_IP_); \ | |
1053 | } while (0) | |
1054 | ||
56316a0d DW |
1055 | /* journal feature predicate functions */ |
1056 | #define JBD2_FEATURE_COMPAT_FUNCS(name, flagname) \ | |
1057 | static inline bool jbd2_has_feature_##name(journal_t *j) \ | |
1058 | { \ | |
1059 | return ((j)->j_format_version >= 2 && \ | |
1060 | ((j)->j_superblock->s_feature_compat & \ | |
1061 | cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname)) != 0); \ | |
1062 | } \ | |
1063 | static inline void jbd2_set_feature_##name(journal_t *j) \ | |
1064 | { \ | |
1065 | (j)->j_superblock->s_feature_compat |= \ | |
1066 | cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname); \ | |
1067 | } \ | |
1068 | static inline void jbd2_clear_feature_##name(journal_t *j) \ | |
1069 | { \ | |
1070 | (j)->j_superblock->s_feature_compat &= \ | |
1071 | ~cpu_to_be32(JBD2_FEATURE_COMPAT_##flagname); \ | |
1072 | } | |
1073 | ||
1074 | #define JBD2_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ | |
1075 | static inline bool jbd2_has_feature_##name(journal_t *j) \ | |
1076 | { \ | |
1077 | return ((j)->j_format_version >= 2 && \ | |
1078 | ((j)->j_superblock->s_feature_ro_compat & \ | |
1079 | cpu_to_be32(JBD2_FEATURE_RO_COMPAT_##flagname)) != 0); \ | |
1080 | } \ | |
1081 | static inline void jbd2_set_feature_##name(journal_t *j) \ | |
1082 | { \ | |
1083 | (j)->j_superblock->s_feature_ro_compat |= \ | |
1084 | cpu_to_be32(JBD2_FEATURE_RO_COMPAT_##flagname); \ | |
1085 | } \ | |
1086 | static inline void jbd2_clear_feature_##name(journal_t *j) \ | |
1087 | { \ | |
1088 | (j)->j_superblock->s_feature_ro_compat &= \ | |
1089 | ~cpu_to_be32(JBD2_FEATURE_RO_COMPAT_##flagname); \ | |
1090 | } | |
1091 | ||
1092 | #define JBD2_FEATURE_INCOMPAT_FUNCS(name, flagname) \ | |
1093 | static inline bool jbd2_has_feature_##name(journal_t *j) \ | |
1094 | { \ | |
1095 | return ((j)->j_format_version >= 2 && \ | |
1096 | ((j)->j_superblock->s_feature_incompat & \ | |
1097 | cpu_to_be32(JBD2_FEATURE_INCOMPAT_##flagname)) != 0); \ | |
1098 | } \ | |
1099 | static inline void jbd2_set_feature_##name(journal_t *j) \ | |
1100 | { \ | |
1101 | (j)->j_superblock->s_feature_incompat |= \ | |
1102 | cpu_to_be32(JBD2_FEATURE_INCOMPAT_##flagname); \ | |
1103 | } \ | |
1104 | static inline void jbd2_clear_feature_##name(journal_t *j) \ | |
1105 | { \ | |
1106 | (j)->j_superblock->s_feature_incompat &= \ | |
1107 | ~cpu_to_be32(JBD2_FEATURE_INCOMPAT_##flagname); \ | |
1108 | } | |
1109 | ||
1110 | JBD2_FEATURE_COMPAT_FUNCS(checksum, CHECKSUM) | |
1111 | ||
1112 | JBD2_FEATURE_INCOMPAT_FUNCS(revoke, REVOKE) | |
1113 | JBD2_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) | |
1114 | JBD2_FEATURE_INCOMPAT_FUNCS(async_commit, ASYNC_COMMIT) | |
1115 | JBD2_FEATURE_INCOMPAT_FUNCS(csum2, CSUM_V2) | |
1116 | JBD2_FEATURE_INCOMPAT_FUNCS(csum3, CSUM_V3) | |
1117 | ||
470decc6 DK |
1118 | /* |
1119 | * Journal flag definitions | |
1120 | */ | |
f7f4bccb MC |
1121 | #define JBD2_UNMOUNT 0x001 /* Journal thread is being destroyed */ |
1122 | #define JBD2_ABORT 0x002 /* Journaling has been aborted for errors. */ | |
1123 | #define JBD2_ACK_ERR 0x004 /* The errno in the sb has been acked */ | |
1124 | #define JBD2_FLUSHED 0x008 /* The journal superblock has been flushed */ | |
1125 | #define JBD2_LOADED 0x010 /* The journal superblock has been loaded */ | |
1126 | #define JBD2_BARRIER 0x020 /* Use IDE barriers */ | |
5bf5683a HK |
1127 | #define JBD2_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file |
1128 | * data write error in ordered | |
1129 | * mode */ | |
4327ba52 | 1130 | #define JBD2_REC_ERR 0x080 /* The errno in the sb has been recorded */ |
470decc6 DK |
1131 | |
1132 | /* | |
1133 | * Function declarations for the journaling transaction and buffer | |
1134 | * management | |
1135 | */ | |
1136 | ||
1137 | /* Filing buffers */ | |
f7f4bccb | 1138 | extern void jbd2_journal_unfile_buffer(journal_t *, struct journal_head *); |
f7f4bccb MC |
1139 | extern void __jbd2_journal_refile_buffer(struct journal_head *); |
1140 | extern void jbd2_journal_refile_buffer(journal_t *, struct journal_head *); | |
1141 | extern void __jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int); | |
470decc6 | 1142 | extern void __journal_free_buffer(struct journal_head *bh); |
f7f4bccb | 1143 | extern void jbd2_journal_file_buffer(struct journal_head *, transaction_t *, int); |
470decc6 | 1144 | extern void __journal_clean_data_list(transaction_t *transaction); |
f5113eff JK |
1145 | static inline void jbd2_file_log_bh(struct list_head *head, struct buffer_head *bh) |
1146 | { | |
1147 | list_add_tail(&bh->b_assoc_buffers, head); | |
1148 | } | |
1149 | static inline void jbd2_unfile_log_bh(struct buffer_head *bh) | |
1150 | { | |
1151 | list_del_init(&bh->b_assoc_buffers); | |
1152 | } | |
470decc6 DK |
1153 | |
1154 | /* Log buffer allocation */ | |
32ab6715 | 1155 | struct buffer_head *jbd2_journal_get_descriptor_buffer(transaction_t *, int); |
1101cd4d | 1156 | void jbd2_descriptor_block_csum_set(journal_t *, struct buffer_head *); |
18eba7aa | 1157 | int jbd2_journal_next_log_block(journal_t *, unsigned long long *); |
79feb521 JK |
1158 | int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid, |
1159 | unsigned long *block); | |
6f6a6fda | 1160 | int __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block); |
3339578f | 1161 | void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block); |
470decc6 DK |
1162 | |
1163 | /* Commit management */ | |
f7f4bccb | 1164 | extern void jbd2_journal_commit_transaction(journal_t *); |
470decc6 DK |
1165 | |
1166 | /* Checkpoint list management */ | |
841df7df | 1167 | void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy); |
f7f4bccb | 1168 | int __jbd2_journal_remove_checkpoint(struct journal_head *); |
841df7df | 1169 | void jbd2_journal_destroy_checkpoint(journal_t *journal); |
f7f4bccb | 1170 | void __jbd2_journal_insert_checkpoint(struct journal_head *, transaction_t *); |
470decc6 | 1171 | |
e06c8227 JB |
1172 | |
1173 | /* | |
1174 | * Triggers | |
1175 | */ | |
1176 | ||
1177 | struct jbd2_buffer_trigger_type { | |
1178 | /* | |
13ceef09 JK |
1179 | * Fired a the moment data to write to the journal are known to be |
1180 | * stable - so either at the moment b_frozen_data is created or just | |
1181 | * before a buffer is written to the journal. mapped_data is a mapped | |
1182 | * buffer that is the frozen data for commit. | |
e06c8227 | 1183 | */ |
13ceef09 | 1184 | void (*t_frozen)(struct jbd2_buffer_trigger_type *type, |
e06c8227 JB |
1185 | struct buffer_head *bh, void *mapped_data, |
1186 | size_t size); | |
1187 | ||
1188 | /* | |
1189 | * Fired during journal abort for dirty buffers that will not be | |
1190 | * committed. | |
1191 | */ | |
1192 | void (*t_abort)(struct jbd2_buffer_trigger_type *type, | |
1193 | struct buffer_head *bh); | |
1194 | }; | |
1195 | ||
13ceef09 | 1196 | extern void jbd2_buffer_frozen_trigger(struct journal_head *jh, |
e06c8227 JB |
1197 | void *mapped_data, |
1198 | struct jbd2_buffer_trigger_type *triggers); | |
1199 | extern void jbd2_buffer_abort_trigger(struct journal_head *jh, | |
1200 | struct jbd2_buffer_trigger_type *triggers); | |
1201 | ||
470decc6 | 1202 | /* Buffer IO */ |
f5113eff JK |
1203 | extern int jbd2_journal_write_metadata_buffer(transaction_t *transaction, |
1204 | struct journal_head *jh_in, | |
1205 | struct buffer_head **bh_out, | |
1206 | sector_t blocknr); | |
470decc6 DK |
1207 | |
1208 | /* Transaction locking */ | |
1209 | extern void __wait_on_journal (journal_t *); | |
1210 | ||
0c2022ec YY |
1211 | /* Transaction cache support */ |
1212 | extern void jbd2_journal_destroy_transaction_cache(void); | |
1213 | extern int jbd2_journal_init_transaction_cache(void); | |
1214 | extern void jbd2_journal_free_transaction(transaction_t *); | |
1215 | ||
470decc6 DK |
1216 | /* |
1217 | * Journal locking. | |
1218 | * | |
1219 | * We need to lock the journal during transaction state changes so that nobody | |
1220 | * ever tries to take a handle on the running transaction while we are in the | |
1221 | * middle of moving it to the commit phase. j_state_lock does this. | |
1222 | * | |
1223 | * Note that the locking is completely interrupt unsafe. We never touch | |
1224 | * journal structures from interrupts. | |
1225 | */ | |
1226 | ||
1227 | static inline handle_t *journal_current_handle(void) | |
1228 | { | |
1229 | return current->journal_info; | |
1230 | } | |
1231 | ||
1232 | /* The journaling code user interface: | |
1233 | * | |
1234 | * Create and destroy handles | |
1235 | * Register buffer modifications against the current transaction. | |
1236 | */ | |
1237 | ||
f7f4bccb | 1238 | extern handle_t *jbd2_journal_start(journal_t *, int nblocks); |
8f7d89f3 JK |
1239 | extern handle_t *jbd2__journal_start(journal_t *, int blocks, int rsv_blocks, |
1240 | gfp_t gfp_mask, unsigned int type, | |
1241 | unsigned int line_no); | |
47def826 | 1242 | extern int jbd2_journal_restart(handle_t *, int nblocks); |
d2159fb7 | 1243 | extern int jbd2__journal_restart(handle_t *, int nblocks, gfp_t gfp_mask); |
8f7d89f3 JK |
1244 | extern int jbd2_journal_start_reserved(handle_t *handle, |
1245 | unsigned int type, unsigned int line_no); | |
1246 | extern void jbd2_journal_free_reserved(handle_t *handle); | |
f7f4bccb MC |
1247 | extern int jbd2_journal_extend (handle_t *, int nblocks); |
1248 | extern int jbd2_journal_get_write_access(handle_t *, struct buffer_head *); | |
1249 | extern int jbd2_journal_get_create_access (handle_t *, struct buffer_head *); | |
1250 | extern int jbd2_journal_get_undo_access(handle_t *, struct buffer_head *); | |
e06c8227 JB |
1251 | void jbd2_journal_set_triggers(struct buffer_head *, |
1252 | struct jbd2_buffer_trigger_type *type); | |
f7f4bccb | 1253 | extern int jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *); |
f7f4bccb | 1254 | extern int jbd2_journal_forget (handle_t *, struct buffer_head *); |
470decc6 | 1255 | extern void journal_sync_buffer (struct buffer_head *); |
53e87268 | 1256 | extern int jbd2_journal_invalidatepage(journal_t *, |
259709b0 | 1257 | struct page *, unsigned int, unsigned int); |
f7f4bccb MC |
1258 | extern int jbd2_journal_try_to_free_buffers(journal_t *, struct page *, gfp_t); |
1259 | extern int jbd2_journal_stop(handle_t *); | |
1260 | extern int jbd2_journal_flush (journal_t *); | |
1261 | extern void jbd2_journal_lock_updates (journal_t *); | |
1262 | extern void jbd2_journal_unlock_updates (journal_t *); | |
470decc6 | 1263 | |
f7f4bccb | 1264 | extern journal_t * jbd2_journal_init_dev(struct block_device *bdev, |
470decc6 | 1265 | struct block_device *fs_dev, |
18eba7aa | 1266 | unsigned long long start, int len, int bsize); |
f7f4bccb MC |
1267 | extern journal_t * jbd2_journal_init_inode (struct inode *); |
1268 | extern int jbd2_journal_update_format (journal_t *); | |
1269 | extern int jbd2_journal_check_used_features | |
470decc6 | 1270 | (journal_t *, unsigned long, unsigned long, unsigned long); |
f7f4bccb | 1271 | extern int jbd2_journal_check_available_features |
470decc6 | 1272 | (journal_t *, unsigned long, unsigned long, unsigned long); |
f7f4bccb | 1273 | extern int jbd2_journal_set_features |
470decc6 | 1274 | (journal_t *, unsigned long, unsigned long, unsigned long); |
818d276c GS |
1275 | extern void jbd2_journal_clear_features |
1276 | (journal_t *, unsigned long, unsigned long, unsigned long); | |
f7f4bccb | 1277 | extern int jbd2_journal_load (journal_t *journal); |
44519faf | 1278 | extern int jbd2_journal_destroy (journal_t *); |
f7f4bccb MC |
1279 | extern int jbd2_journal_recover (journal_t *journal); |
1280 | extern int jbd2_journal_wipe (journal_t *, int); | |
1281 | extern int jbd2_journal_skip_recovery (journal_t *); | |
d796c52e | 1282 | extern void jbd2_journal_update_sb_errno(journal_t *); |
6f6a6fda | 1283 | extern int jbd2_journal_update_sb_log_tail (journal_t *, tid_t, |
79feb521 | 1284 | unsigned long, int); |
f7f4bccb MC |
1285 | extern void __jbd2_journal_abort_hard (journal_t *); |
1286 | extern void jbd2_journal_abort (journal_t *, int); | |
1287 | extern int jbd2_journal_errno (journal_t *); | |
1288 | extern void jbd2_journal_ack_err (journal_t *); | |
1289 | extern int jbd2_journal_clear_err (journal_t *); | |
18eba7aa | 1290 | extern int jbd2_journal_bmap(journal_t *, unsigned long, unsigned long long *); |
f7f4bccb | 1291 | extern int jbd2_journal_force_commit(journal_t *); |
9ff86446 | 1292 | extern int jbd2_journal_force_commit_nested(journal_t *); |
41617e1a JK |
1293 | extern int jbd2_journal_inode_add_write(handle_t *handle, struct jbd2_inode *inode); |
1294 | extern int jbd2_journal_inode_add_wait(handle_t *handle, struct jbd2_inode *inode); | |
7f5aa215 JK |
1295 | extern int jbd2_journal_begin_ordered_truncate(journal_t *journal, |
1296 | struct jbd2_inode *inode, loff_t new_size); | |
c851ed54 JK |
1297 | extern void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode); |
1298 | extern void jbd2_journal_release_jbd_inode(journal_t *journal, struct jbd2_inode *jinode); | |
470decc6 DK |
1299 | |
1300 | /* | |
1301 | * journal_head management | |
1302 | */ | |
f7f4bccb MC |
1303 | struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh); |
1304 | struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh); | |
f7f4bccb | 1305 | void jbd2_journal_put_journal_head(struct journal_head *jh); |
470decc6 DK |
1306 | |
1307 | /* | |
1308 | * handle management | |
1309 | */ | |
e18b890b | 1310 | extern struct kmem_cache *jbd2_handle_cache; |
470decc6 | 1311 | |
af1e76d6 | 1312 | static inline handle_t *jbd2_alloc_handle(gfp_t gfp_flags) |
470decc6 | 1313 | { |
28daf4fa | 1314 | return kmem_cache_zalloc(jbd2_handle_cache, gfp_flags); |
470decc6 DK |
1315 | } |
1316 | ||
af1e76d6 | 1317 | static inline void jbd2_free_handle(handle_t *handle) |
470decc6 | 1318 | { |
f7f4bccb | 1319 | kmem_cache_free(jbd2_handle_cache, handle); |
470decc6 DK |
1320 | } |
1321 | ||
8aefcd55 TT |
1322 | /* |
1323 | * jbd2_inode management (optional, for those file systems that want to use | |
1324 | * dynamically allocated jbd2_inode structures) | |
1325 | */ | |
1326 | extern struct kmem_cache *jbd2_inode_cache; | |
1327 | ||
1328 | static inline struct jbd2_inode *jbd2_alloc_inode(gfp_t gfp_flags) | |
1329 | { | |
1330 | return kmem_cache_alloc(jbd2_inode_cache, gfp_flags); | |
1331 | } | |
1332 | ||
1333 | static inline void jbd2_free_inode(struct jbd2_inode *jinode) | |
1334 | { | |
1335 | kmem_cache_free(jbd2_inode_cache, jinode); | |
1336 | } | |
1337 | ||
470decc6 DK |
1338 | /* Primary revoke support */ |
1339 | #define JOURNAL_REVOKE_DEFAULT_HASH 256 | |
f7f4bccb MC |
1340 | extern int jbd2_journal_init_revoke(journal_t *, int); |
1341 | extern void jbd2_journal_destroy_revoke_caches(void); | |
1342 | extern int jbd2_journal_init_revoke_caches(void); | |
470decc6 | 1343 | |
f7f4bccb | 1344 | extern void jbd2_journal_destroy_revoke(journal_t *); |
18eba7aa | 1345 | extern int jbd2_journal_revoke (handle_t *, unsigned long long, struct buffer_head *); |
f7f4bccb | 1346 | extern int jbd2_journal_cancel_revoke(handle_t *, struct journal_head *); |
9bcf976c JK |
1347 | extern void jbd2_journal_write_revoke_records(transaction_t *transaction, |
1348 | struct list_head *log_bufs); | |
470decc6 DK |
1349 | |
1350 | /* Recovery revoke support */ | |
18eba7aa MC |
1351 | extern int jbd2_journal_set_revoke(journal_t *, unsigned long long, tid_t); |
1352 | extern int jbd2_journal_test_revoke(journal_t *, unsigned long long, tid_t); | |
f7f4bccb MC |
1353 | extern void jbd2_journal_clear_revoke(journal_t *); |
1354 | extern void jbd2_journal_switch_revoke_table(journal_t *journal); | |
1ba37268 | 1355 | extern void jbd2_clear_buffer_revoked_flags(journal_t *journal); |
470decc6 DK |
1356 | |
1357 | /* | |
1358 | * The log thread user interface: | |
1359 | * | |
1360 | * Request space in the current transaction, and force transaction commit | |
1361 | * transitions on demand. | |
1362 | */ | |
1363 | ||
f7f4bccb MC |
1364 | int jbd2_log_start_commit(journal_t *journal, tid_t tid); |
1365 | int __jbd2_log_start_commit(journal_t *journal, tid_t tid); | |
1366 | int jbd2_journal_start_commit(journal_t *journal, tid_t *tid); | |
f7f4bccb | 1367 | int jbd2_log_wait_commit(journal_t *journal, tid_t tid); |
d76a3a77 | 1368 | int jbd2_complete_transaction(journal_t *journal, tid_t tid); |
f7f4bccb | 1369 | int jbd2_log_do_checkpoint(journal_t *journal); |
bbd2be36 | 1370 | int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid); |
470decc6 | 1371 | |
f7f4bccb | 1372 | void __jbd2_log_wait_for_space(journal_t *journal); |
fb68407b AK |
1373 | extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *); |
1374 | extern int jbd2_cleanup_journal_tail(journal_t *); | |
470decc6 | 1375 | |
470decc6 DK |
1376 | /* |
1377 | * is_journal_abort | |
1378 | * | |
f7f4bccb | 1379 | * Simple test wrapper function to test the JBD2_ABORT state flag. This |
470decc6 DK |
1380 | * bit, when set, indicates that we have had a fatal error somewhere, |
1381 | * either inside the journaling layer or indicated to us by the client | |
1382 | * (eg. ext3), and that we and should not commit any further | |
1383 | * transactions. | |
1384 | */ | |
1385 | ||
1386 | static inline int is_journal_aborted(journal_t *journal) | |
1387 | { | |
f7f4bccb | 1388 | return journal->j_flags & JBD2_ABORT; |
470decc6 DK |
1389 | } |
1390 | ||
1391 | static inline int is_handle_aborted(handle_t *handle) | |
1392 | { | |
41a5b913 | 1393 | if (handle->h_aborted || !handle->h_transaction) |
470decc6 DK |
1394 | return 1; |
1395 | return is_journal_aborted(handle->h_transaction->t_journal); | |
1396 | } | |
1397 | ||
f7f4bccb | 1398 | static inline void jbd2_journal_abort_handle(handle_t *handle) |
470decc6 DK |
1399 | { |
1400 | handle->h_aborted = 1; | |
1401 | } | |
1402 | ||
1403 | #endif /* __KERNEL__ */ | |
1404 | ||
1405 | /* Comparison functions for transaction IDs: perform comparisons using | |
1406 | * modulo arithmetic so that they work over sequence number wraps. */ | |
1407 | ||
1408 | static inline int tid_gt(tid_t x, tid_t y) | |
1409 | { | |
1410 | int difference = (x - y); | |
1411 | return (difference > 0); | |
1412 | } | |
1413 | ||
1414 | static inline int tid_geq(tid_t x, tid_t y) | |
1415 | { | |
1416 | int difference = (x - y); | |
1417 | return (difference >= 0); | |
1418 | } | |
1419 | ||
f7f4bccb | 1420 | extern int jbd2_journal_blocks_per_page(struct inode *inode); |
b517bea1 | 1421 | extern size_t journal_tag_bytes(journal_t *journal); |
470decc6 | 1422 | |
8595798c DW |
1423 | static inline bool jbd2_journal_has_csum_v2or3_feature(journal_t *j) |
1424 | { | |
56316a0d | 1425 | return jbd2_has_feature_csum2(j) || jbd2_has_feature_csum3(j); |
8595798c DW |
1426 | } |
1427 | ||
db9ee220 DW |
1428 | static inline int jbd2_journal_has_csum_v2or3(journal_t *journal) |
1429 | { | |
8595798c DW |
1430 | WARN_ON_ONCE(jbd2_journal_has_csum_v2or3_feature(journal) && |
1431 | journal->j_chksum_driver == NULL); | |
db9ee220 | 1432 | |
8595798c | 1433 | return journal->j_chksum_driver != NULL; |
db9ee220 DW |
1434 | } |
1435 | ||
76c39904 JK |
1436 | /* |
1437 | * We reserve t_outstanding_credits >> JBD2_CONTROL_BLOCKS_SHIFT for | |
1438 | * transaction control blocks. | |
1439 | */ | |
1440 | #define JBD2_CONTROL_BLOCKS_SHIFT 5 | |
1441 | ||
470decc6 DK |
1442 | /* |
1443 | * Return the minimum number of blocks which must be free in the journal | |
1444 | * before a new transaction may be started. Must be called under j_state_lock. | |
1445 | */ | |
76c39904 | 1446 | static inline int jbd2_space_needed(journal_t *journal) |
470decc6 DK |
1447 | { |
1448 | int nblocks = journal->j_max_transaction_buffers; | |
76c39904 JK |
1449 | return nblocks + (nblocks >> JBD2_CONTROL_BLOCKS_SHIFT); |
1450 | } | |
1451 | ||
1452 | /* | |
1453 | * Return number of free blocks in the log. Must be called under j_state_lock. | |
1454 | */ | |
1455 | static inline unsigned long jbd2_log_space_left(journal_t *journal) | |
1456 | { | |
1457 | /* Allow for rounding errors */ | |
1458 | unsigned long free = journal->j_free - 32; | |
1459 | ||
1460 | if (journal->j_committing_transaction) { | |
1461 | unsigned long committing = atomic_read(&journal-> | |
1462 | j_committing_transaction->t_outstanding_credits); | |
1463 | ||
1464 | /* Transaction + control blocks */ | |
1465 | free -= committing + (committing >> JBD2_CONTROL_BLOCKS_SHIFT); | |
1466 | } | |
1467 | return free; | |
470decc6 DK |
1468 | } |
1469 | ||
1470 | /* | |
1471 | * Definitions which augment the buffer_head layer | |
1472 | */ | |
1473 | ||
1474 | /* journaling buffer types */ | |
1475 | #define BJ_None 0 /* Not journaled */ | |
87c89c23 JK |
1476 | #define BJ_Metadata 1 /* Normal journaled metadata */ |
1477 | #define BJ_Forget 2 /* Buffer superseded by this transaction */ | |
f5113eff | 1478 | #define BJ_Shadow 3 /* Buffer contents being shadowed to the log */ |
e5a120ae JK |
1479 | #define BJ_Reserved 4 /* Buffer is reserved for access by journal */ |
1480 | #define BJ_Types 5 | |
470decc6 DK |
1481 | |
1482 | extern int jbd_blocks_per_page(struct inode *inode); | |
1483 | ||
fd47d3e1 BW |
1484 | /* JBD uses a CRC32 checksum */ |
1485 | #define JBD_MAX_CHECKSUM_SIZE 4 | |
1486 | ||
01b5adce DW |
1487 | static inline u32 jbd2_chksum(journal_t *journal, u32 crc, |
1488 | const void *address, unsigned int length) | |
1489 | { | |
1490 | struct { | |
1491 | struct shash_desc shash; | |
fd47d3e1 | 1492 | char ctx[JBD_MAX_CHECKSUM_SIZE]; |
01b5adce DW |
1493 | } desc; |
1494 | int err; | |
1495 | ||
fd47d3e1 BW |
1496 | BUG_ON(crypto_shash_descsize(journal->j_chksum_driver) > |
1497 | JBD_MAX_CHECKSUM_SIZE); | |
1498 | ||
01b5adce DW |
1499 | desc.shash.tfm = journal->j_chksum_driver; |
1500 | desc.shash.flags = 0; | |
1501 | *(u32 *)desc.ctx = crc; | |
1502 | ||
1503 | err = crypto_shash_update(&desc.shash, address, length); | |
1504 | BUG_ON(err); | |
1505 | ||
1506 | return *(u32 *)desc.ctx; | |
1507 | } | |
1508 | ||
06a407f1 DM |
1509 | /* Return most recent uncommitted transaction */ |
1510 | static inline tid_t jbd2_get_latest_transaction(journal_t *journal) | |
1511 | { | |
1512 | tid_t tid; | |
1513 | ||
1514 | read_lock(&journal->j_state_lock); | |
1515 | tid = journal->j_commit_request; | |
1516 | if (journal->j_running_transaction) | |
1517 | tid = journal->j_running_transaction->t_tid; | |
1518 | read_unlock(&journal->j_state_lock); | |
1519 | return tid; | |
1520 | } | |
1521 | ||
470decc6 DK |
1522 | #ifdef __KERNEL__ |
1523 | ||
1524 | #define buffer_trace_init(bh) do {} while (0) | |
1525 | #define print_buffer_fields(bh) do {} while (0) | |
1526 | #define print_buffer_trace(bh) do {} while (0) | |
1527 | #define BUFFER_TRACE(bh, info) do {} while (0) | |
1528 | #define BUFFER_TRACE2(bh, bh2, info) do {} while (0) | |
1529 | #define JBUFFER_TRACE(jh, info) do {} while (0) | |
1530 | ||
1531 | #endif /* __KERNEL__ */ | |
1532 | ||
6a797d27 DW |
1533 | #define EFSBADCRC EBADMSG /* Bad CRC detected */ |
1534 | #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ | |
1535 | ||
cd02ff0b | 1536 | #endif /* _LINUX_JBD2_H */ |