Blame view
fs/jbd2/revoke.c
21.9 KB
470decc61 [PATCH] jbd2: ini... |
1 |
/* |
588626996 fix file specific... |
2 |
* linux/fs/jbd2/revoke.c |
470decc61 [PATCH] jbd2: ini... |
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 |
* * Written by Stephen C. Tweedie <sct@redhat.com>, 2000 * * Copyright 2000 Red Hat corp --- All Rights Reserved * * This file is part of the Linux kernel and is made available under * the terms of the GNU General Public License, version 2, or at your * option, any later version, incorporated herein by reference. * * Journal revoke routines for the generic filesystem journaling code; * part of the ext2fs journaling system. * * Revoke is the mechanism used to prevent old log records for deleted * metadata from being replayed on top of newer data using the same * blocks. The revoke mechanism is used in two separate places: * * + Commit: during commit we write the entire list of the current * transaction's revoked blocks to the journal * * + Recovery: during recovery we record the transaction ID of all * revoked blocks. If there are multiple revoke records in the log * for a single block, only the last one counts, and if there is a log * entry for a block beyond the last revoke, then that log entry still * gets replayed. * * We can get interactions between revokes and new log data within a * single transaction: * * Block is revoked and then journaled: * The desired end result is the journaling of the new block, so we * cancel the revoke before the transaction commits. * * Block is journaled and then revoked: * The revoke must take precedence over the write of the block, so we * need either to cancel the journal entry or to write the revoke * later in the log than the log block. In this case, we choose the * latter: journaling a block cancels any revoke record for that block * in the current transaction, so any revoke for that block in the * transaction must have happened after the block was journaled and so * the revoke must take precedence. * * Block is revoked and then written as data: * The data write is allowed to succeed, but the revoke is _not_ * cancelled. We still need to prevent old log records from * overwriting the new data. We don't even need to clear the revoke * bit here. * |
1ba37268c jbd2: clear revok... |
50 51 52 53 |
* We cache revoke status of a buffer in the current transaction in b_states * bits. As the name says, revokevalid flag indicates that the cached revoke * status of a buffer is valid and we can rely on the cached status. * |
470decc61 [PATCH] jbd2: ini... |
54 55 56 57 58 59 60 61 |
* Revoke information on buffers is a tri-state value: * * RevokeValid clear: no cached revoke status, need to look it up * RevokeValid set, Revoked clear: * buffer has not been revoked, and cancel_revoke * need do nothing. * RevokeValid set, Revoked set: * buffer has been revoked. |
86db97c87 jbd2: Update lock... |
62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 |
* * Locking rules: * We keep two hash tables of revoke records. One hashtable belongs to the * running transaction (is pointed to by journal->j_revoke), the other one * belongs to the committing transaction. Accesses to the second hash table * happen only from the kjournald and no other thread touches this table. Also * journal_switch_revoke_table() which switches which hashtable belongs to the * running and which to the committing transaction is called only from * kjournald. Therefore we need no locks when accessing the hashtable belonging * to the committing transaction. * * All users operating on the hash table belonging to the running transaction * have a handle to the transaction. Therefore they are safe from kjournald * switching hash tables under them. For operations on the lists of entries in * the hash table j_revoke_lock is used. * |
25985edce Fix common misspe... |
78 |
* Finally, also replay code uses the hash tables but at this moment no one else |
86db97c87 jbd2: Update lock... |
79 80 |
* can touch them (filesystem isn't mounted yet) and hence no locking is * needed. |
470decc61 [PATCH] jbd2: ini... |
81 82 83 84 85 86 87 |
*/ #ifndef __KERNEL__ #include "jfs_user.h" #else #include <linux/time.h> #include <linux/fs.h> |
f7f4bccb7 [PATCH] jbd2: ren... |
88 |
#include <linux/jbd2.h> |
470decc61 [PATCH] jbd2: ini... |
89 90 91 |
#include <linux/errno.h> #include <linux/slab.h> #include <linux/list.h> |
470decc61 [PATCH] jbd2: ini... |
92 |
#include <linux/init.h> |
67c457a8c jbd2: use SWRITE_... |
93 |
#include <linux/bio.h> |
470decc61 [PATCH] jbd2: ini... |
94 |
#endif |
f482394cc is_power_of_2(): jbd |
95 |
#include <linux/log2.h> |
470decc61 [PATCH] jbd2: ini... |
96 |
|
e18b890bb [PATCH] slab: rem... |
97 98 |
static struct kmem_cache *jbd2_revoke_record_cache; static struct kmem_cache *jbd2_revoke_table_cache; |
470decc61 [PATCH] jbd2: ini... |
99 100 101 102 |
/* Each revoke record represents one single revoked block. During journal replay, this involves recording the transaction ID of the last transaction to revoke this block. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
103 |
struct jbd2_revoke_record_s |
470decc61 [PATCH] jbd2: ini... |
104 105 106 |
{ struct list_head hash; tid_t sequence; /* Used for recovery only */ |
18eba7aae [PATCH] jbd2: swi... |
107 |
unsigned long long blocknr; |
470decc61 [PATCH] jbd2: ini... |
108 109 110 111 |
}; /* The revoke table is just a simple hash table of revoke records. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
112 |
struct jbd2_revoke_table_s |
470decc61 [PATCH] jbd2: ini... |
113 114 115 116 117 118 119 120 121 122 123 124 |
{ /* It is conceivable that we might want a larger hash table * for recovery. Must be a power of two. */ int hash_size; int hash_shift; struct list_head *hash_table; }; #ifdef __KERNEL__ static void write_one_revoke_record(journal_t *, transaction_t *, struct journal_head **, int *, |
67c457a8c jbd2: use SWRITE_... |
125 126 |
struct jbd2_revoke_record_s *, int); static void flush_descriptor(journal_t *, struct journal_head *, int, int); |
470decc61 [PATCH] jbd2: ini... |
127 128 129 130 131 |
#endif /* Utility functions to maintain the revoke table */ /* Borrowed from buffer.c: this is a tried and tested block hash function */ |
18eba7aae [PATCH] jbd2: swi... |
132 |
static inline int hash(journal_t *journal, unsigned long long block) |
470decc61 [PATCH] jbd2: ini... |
133 |
{ |
f7f4bccb7 [PATCH] jbd2: ren... |
134 |
struct jbd2_revoke_table_s *table = journal->j_revoke; |
470decc61 [PATCH] jbd2: ini... |
135 |
int hash_shift = table->hash_shift; |
299717696 [PATCH] jbd2: sec... |
136 |
int hash = (int)block ^ (int)((block >> 31) >> 1); |
470decc61 [PATCH] jbd2: ini... |
137 |
|
299717696 [PATCH] jbd2: sec... |
138 139 140 |
return ((hash << (hash_shift - 6)) ^ (hash >> 13) ^ (hash << (hash_shift - 12))) & (table->hash_size - 1); |
470decc61 [PATCH] jbd2: ini... |
141 |
} |
18eba7aae [PATCH] jbd2: swi... |
142 |
static int insert_revoke_hash(journal_t *journal, unsigned long long blocknr, |
470decc61 [PATCH] jbd2: ini... |
143 144 145 |
tid_t seq) { struct list_head *hash_list; |
f7f4bccb7 [PATCH] jbd2: ren... |
146 |
struct jbd2_revoke_record_s *record; |
470decc61 [PATCH] jbd2: ini... |
147 148 |
repeat: |
f7f4bccb7 [PATCH] jbd2: ren... |
149 |
record = kmem_cache_alloc(jbd2_revoke_record_cache, GFP_NOFS); |
470decc61 [PATCH] jbd2: ini... |
150 151 152 153 154 155 156 157 158 159 160 161 162 163 |
if (!record) goto oom; record->sequence = seq; record->blocknr = blocknr; hash_list = &journal->j_revoke->hash_table[hash(journal, blocknr)]; spin_lock(&journal->j_revoke_lock); list_add(&record->hash, hash_list); spin_unlock(&journal->j_revoke_lock); return 0; oom: if (!journal_oom_retry) return -ENOMEM; |
329d291f5 jdb2: replace rem... |
164 165 |
jbd_debug(1, "ENOMEM in %s, retrying ", __func__); |
470decc61 [PATCH] jbd2: ini... |
166 167 168 169 170 |
yield(); goto repeat; } /* Find a revoke record in the journal's hash table. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
171 |
static struct jbd2_revoke_record_s *find_revoke_record(journal_t *journal, |
18eba7aae [PATCH] jbd2: swi... |
172 |
unsigned long long blocknr) |
470decc61 [PATCH] jbd2: ini... |
173 174 |
{ struct list_head *hash_list; |
f7f4bccb7 [PATCH] jbd2: ren... |
175 |
struct jbd2_revoke_record_s *record; |
470decc61 [PATCH] jbd2: ini... |
176 177 178 179 |
hash_list = &journal->j_revoke->hash_table[hash(journal, blocknr)]; spin_lock(&journal->j_revoke_lock); |
f7f4bccb7 [PATCH] jbd2: ren... |
180 |
record = (struct jbd2_revoke_record_s *) hash_list->next; |
470decc61 [PATCH] jbd2: ini... |
181 182 183 184 185 |
while (&(record->hash) != hash_list) { if (record->blocknr == blocknr) { spin_unlock(&journal->j_revoke_lock); return record; } |
f7f4bccb7 [PATCH] jbd2: ren... |
186 |
record = (struct jbd2_revoke_record_s *) record->hash.next; |
470decc61 [PATCH] jbd2: ini... |
187 188 189 190 |
} spin_unlock(&journal->j_revoke_lock); return NULL; } |
9fa27c85d jbd2: tidy up rev... |
191 192 193 194 195 196 197 198 199 200 201 |
void jbd2_journal_destroy_revoke_caches(void) { if (jbd2_revoke_record_cache) { kmem_cache_destroy(jbd2_revoke_record_cache); jbd2_revoke_record_cache = NULL; } if (jbd2_revoke_table_cache) { kmem_cache_destroy(jbd2_revoke_table_cache); jbd2_revoke_table_cache = NULL; } } |
f7f4bccb7 [PATCH] jbd2: ren... |
202 |
int __init jbd2_journal_init_revoke_caches(void) |
470decc61 [PATCH] jbd2: ini... |
203 |
{ |
9fa27c85d jbd2: tidy up rev... |
204 205 |
J_ASSERT(!jbd2_revoke_record_cache); J_ASSERT(!jbd2_revoke_table_cache); |
a920e9416 [PATCH] jbd2: ren... |
206 |
jbd2_revoke_record_cache = kmem_cache_create("jbd2_revoke_record", |
f7f4bccb7 [PATCH] jbd2: ren... |
207 |
sizeof(struct jbd2_revoke_record_s), |
77160957e jbd2: Mark jbd2 s... |
208 209 210 |
0, SLAB_HWCACHE_ALIGN|SLAB_TEMPORARY, NULL); |
1076d17ac jbd/jbd2 NULL noise |
211 |
if (!jbd2_revoke_record_cache) |
9fa27c85d jbd2: tidy up rev... |
212 |
goto record_cache_failure; |
470decc61 [PATCH] jbd2: ini... |
213 |
|
a920e9416 [PATCH] jbd2: ren... |
214 |
jbd2_revoke_table_cache = kmem_cache_create("jbd2_revoke_table", |
f7f4bccb7 [PATCH] jbd2: ren... |
215 |
sizeof(struct jbd2_revoke_table_s), |
77160957e jbd2: Mark jbd2 s... |
216 |
0, SLAB_TEMPORARY, NULL); |
9fa27c85d jbd2: tidy up rev... |
217 218 |
if (!jbd2_revoke_table_cache) goto table_cache_failure; |
470decc61 [PATCH] jbd2: ini... |
219 |
return 0; |
9fa27c85d jbd2: tidy up rev... |
220 221 222 223 |
table_cache_failure: jbd2_journal_destroy_revoke_caches(); record_cache_failure: return -ENOMEM; |
470decc61 [PATCH] jbd2: ini... |
224 |
} |
83c49523c jbd2: eliminate d... |
225 |
static struct jbd2_revoke_table_s *jbd2_journal_init_revoke_table(int hash_size) |
470decc61 [PATCH] jbd2: ini... |
226 |
{ |
83c49523c jbd2: eliminate d... |
227 228 229 |
int shift = 0; int tmp = hash_size; struct jbd2_revoke_table_s *table; |
470decc61 [PATCH] jbd2: ini... |
230 |
|
83c49523c jbd2: eliminate d... |
231 232 233 |
table = kmem_cache_alloc(jbd2_revoke_table_cache, GFP_KERNEL); if (!table) goto out; |
470decc61 [PATCH] jbd2: ini... |
234 |
|
470decc61 [PATCH] jbd2: ini... |
235 236 |
while((tmp >>= 1UL) != 0UL) shift++; |
83c49523c jbd2: eliminate d... |
237 238 239 |
table->hash_size = hash_size; table->hash_shift = shift; table->hash_table = |
470decc61 [PATCH] jbd2: ini... |
240 |
kmalloc(hash_size * sizeof(struct list_head), GFP_KERNEL); |
83c49523c jbd2: eliminate d... |
241 242 243 244 |
if (!table->hash_table) { kmem_cache_free(jbd2_revoke_table_cache, table); table = NULL; goto out; |
470decc61 [PATCH] jbd2: ini... |
245 246 247 |
} for (tmp = 0; tmp < hash_size; tmp++) |
83c49523c jbd2: eliminate d... |
248 |
INIT_LIST_HEAD(&table->hash_table[tmp]); |
470decc61 [PATCH] jbd2: ini... |
249 |
|
83c49523c jbd2: eliminate d... |
250 251 252 253 254 255 256 257 258 259 260 261 |
out: return table; } static void jbd2_journal_destroy_revoke_table(struct jbd2_revoke_table_s *table) { int i; struct list_head *hash_list; for (i = 0; i < table->hash_size; i++) { hash_list = &table->hash_table[i]; J_ASSERT(list_empty(hash_list)); |
470decc61 [PATCH] jbd2: ini... |
262 |
} |
83c49523c jbd2: eliminate d... |
263 264 265 |
kfree(table->hash_table); kmem_cache_free(jbd2_revoke_table_cache, table); } |
470decc61 [PATCH] jbd2: ini... |
266 |
|
83c49523c jbd2: eliminate d... |
267 268 269 270 |
/* Initialise the revoke table for a given journal to a given size. */ int jbd2_journal_init_revoke(journal_t *journal, int hash_size) { J_ASSERT(journal->j_revoke_table[0] == NULL); |
f482394cc is_power_of_2(): jbd |
271 |
J_ASSERT(is_power_of_2(hash_size)); |
470decc61 [PATCH] jbd2: ini... |
272 |
|
83c49523c jbd2: eliminate d... |
273 274 275 |
journal->j_revoke_table[0] = jbd2_journal_init_revoke_table(hash_size); if (!journal->j_revoke_table[0]) goto fail0; |
470decc61 [PATCH] jbd2: ini... |
276 |
|
83c49523c jbd2: eliminate d... |
277 278 279 |
journal->j_revoke_table[1] = jbd2_journal_init_revoke_table(hash_size); if (!journal->j_revoke_table[1]) goto fail1; |
470decc61 [PATCH] jbd2: ini... |
280 |
|
83c49523c jbd2: eliminate d... |
281 |
journal->j_revoke = journal->j_revoke_table[1]; |
470decc61 [PATCH] jbd2: ini... |
282 283 284 285 |
spin_lock_init(&journal->j_revoke_lock); return 0; |
470decc61 [PATCH] jbd2: ini... |
286 |
|
83c49523c jbd2: eliminate d... |
287 288 289 290 291 |
fail1: jbd2_journal_destroy_revoke_table(journal->j_revoke_table[0]); fail0: return -ENOMEM; } |
470decc61 [PATCH] jbd2: ini... |
292 |
|
83c49523c jbd2: eliminate d... |
293 |
/* Destroy a journal's revoke table. The table must already be empty! */ |
f7f4bccb7 [PATCH] jbd2: ren... |
294 |
void jbd2_journal_destroy_revoke(journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
295 |
{ |
470decc61 [PATCH] jbd2: ini... |
296 |
journal->j_revoke = NULL; |
83c49523c jbd2: eliminate d... |
297 298 299 300 |
if (journal->j_revoke_table[0]) jbd2_journal_destroy_revoke_table(journal->j_revoke_table[0]); if (journal->j_revoke_table[1]) jbd2_journal_destroy_revoke_table(journal->j_revoke_table[1]); |
470decc61 [PATCH] jbd2: ini... |
301 302 303 304 305 306 |
} #ifdef __KERNEL__ /* |
f7f4bccb7 [PATCH] jbd2: ren... |
307 |
* jbd2_journal_revoke: revoke a given buffer_head from the journal. This |
470decc61 [PATCH] jbd2: ini... |
308 309 310 311 312 313 314 315 316 317 318 |
* prevents the block from being replayed during recovery if we take a * crash after this current transaction commits. Any subsequent * metadata writes of the buffer in this transaction cancel the * revoke. * * Note that this call may block --- it is up to the caller to make * sure that there are no further calls to journal_write_metadata * before the revoke is complete. In ext3, this implies calling the * revoke before clearing the block bitmap when we are deleting * metadata. * |
f7f4bccb7 [PATCH] jbd2: ren... |
319 |
* Revoke performs a jbd2_journal_forget on any buffer_head passed in as a |
470decc61 [PATCH] jbd2: ini... |
320 321 322 323 324 325 |
* parameter, but does _not_ forget the buffer_head if the bh was only * found implicitly. * * bh_in may not be a journalled buffer - it may have come off * the hash tables without an attached journal_head. * |
f7f4bccb7 [PATCH] jbd2: ren... |
326 |
* If bh_in is non-zero, jbd2_journal_revoke() will decrement its b_count |
470decc61 [PATCH] jbd2: ini... |
327 328 |
* by one. */ |
18eba7aae [PATCH] jbd2: swi... |
329 |
int jbd2_journal_revoke(handle_t *handle, unsigned long long blocknr, |
470decc61 [PATCH] jbd2: ini... |
330 331 332 333 334 335 336 337 338 339 340 341 |
struct buffer_head *bh_in) { struct buffer_head *bh = NULL; journal_t *journal; struct block_device *bdev; int err; might_sleep(); if (bh_in) BUFFER_TRACE(bh_in, "enter"); journal = handle->h_transaction->t_journal; |
f7f4bccb7 [PATCH] jbd2: ren... |
342 |
if (!jbd2_journal_set_features(journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)){ |
470decc61 [PATCH] jbd2: ini... |
343 344 345 346 347 348 349 350 351 352 353 354 |
J_ASSERT (!"Cannot set revoke feature!"); return -EINVAL; } bdev = journal->j_fs_dev; bh = bh_in; if (!bh) { bh = __find_get_block(bdev, blocknr, journal->j_blocksize); if (bh) BUFFER_TRACE(bh, "found on hash"); } |
cd02ff0b1 jbd2: JBD_XXX to ... |
355 |
#ifdef JBD2_EXPENSIVE_CHECKING |
470decc61 [PATCH] jbd2: ini... |
356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 |
else { struct buffer_head *bh2; /* If there is a different buffer_head lying around in * memory anywhere... */ bh2 = __find_get_block(bdev, blocknr, journal->j_blocksize); if (bh2) { /* ... and it has RevokeValid status... */ if (bh2 != bh && buffer_revokevalid(bh2)) /* ...then it better be revoked too, * since it's illegal to create a revoke * record against a buffer_head which is * not marked revoked --- that would * risk missing a subsequent revoke * cancel. */ J_ASSERT_BH(bh2, buffer_revoked(bh2)); put_bh(bh2); } } #endif /* We really ought not ever to revoke twice in a row without first having the revoke cancelled: it's illegal to free a block twice without allocating it in between! */ if (bh) { if (!J_EXPECT_BH(bh, !buffer_revoked(bh), "inconsistent data on disk")) { if (!bh_in) brelse(bh); return -EIO; } set_buffer_revoked(bh); set_buffer_revokevalid(bh); if (bh_in) { |
f7f4bccb7 [PATCH] jbd2: ren... |
390 391 |
BUFFER_TRACE(bh_in, "call jbd2_journal_forget"); jbd2_journal_forget(handle, bh_in); |
470decc61 [PATCH] jbd2: ini... |
392 393 394 395 396 |
} else { BUFFER_TRACE(bh, "call brelse"); __brelse(bh); } } |
299717696 [PATCH] jbd2: sec... |
397 398 |
jbd_debug(2, "insert revoke for block %llu, bh_in=%p ",blocknr, bh_in); |
470decc61 [PATCH] jbd2: ini... |
399 400 401 402 403 404 405 406 |
err = insert_revoke_hash(journal, blocknr, handle->h_transaction->t_tid); BUFFER_TRACE(bh_in, "exit"); return err; } /* * Cancel an outstanding revoke. For use only internally by the |
f7f4bccb7 [PATCH] jbd2: ren... |
407 |
* journaling code (called from jbd2_journal_get_write_access). |
470decc61 [PATCH] jbd2: ini... |
408 409 410 411 412 413 414 415 416 417 418 |
* * We trust buffer_revoked() on the buffer if the buffer is already * being journaled: if there is no revoke pending on the buffer, then we * don't do anything here. * * This would break if it were possible for a buffer to be revoked and * discarded, and then reallocated within the same transaction. In such * a case we would have lost the revoked bit, but when we arrived here * the second time we would still have a pending revoke to cancel. So, * do not trust the Revoked bit on buffers unless RevokeValid is also * set. |
470decc61 [PATCH] jbd2: ini... |
419 |
*/ |
f7f4bccb7 [PATCH] jbd2: ren... |
420 |
int jbd2_journal_cancel_revoke(handle_t *handle, struct journal_head *jh) |
470decc61 [PATCH] jbd2: ini... |
421 |
{ |
f7f4bccb7 [PATCH] jbd2: ren... |
422 |
struct jbd2_revoke_record_s *record; |
470decc61 [PATCH] jbd2: ini... |
423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 |
journal_t *journal = handle->h_transaction->t_journal; int need_cancel; int did_revoke = 0; /* akpm: debug */ struct buffer_head *bh = jh2bh(jh); jbd_debug(4, "journal_head %p, cancelling revoke ", jh); /* Is the existing Revoke bit valid? If so, we trust it, and * only perform the full cancel if the revoke bit is set. If * not, we can't trust the revoke bit, and we need to do the * full search for a revoke record. */ if (test_set_buffer_revokevalid(bh)) { need_cancel = test_clear_buffer_revoked(bh); } else { need_cancel = 1; clear_buffer_revoked(bh); } if (need_cancel) { record = find_revoke_record(journal, bh->b_blocknr); if (record) { jbd_debug(4, "cancelled existing revoke on " "blocknr %llu ", (unsigned long long)bh->b_blocknr); spin_lock(&journal->j_revoke_lock); list_del(&record->hash); spin_unlock(&journal->j_revoke_lock); |
f7f4bccb7 [PATCH] jbd2: ren... |
451 |
kmem_cache_free(jbd2_revoke_record_cache, record); |
470decc61 [PATCH] jbd2: ini... |
452 453 454 |
did_revoke = 1; } } |
cd02ff0b1 jbd2: JBD_XXX to ... |
455 |
#ifdef JBD2_EXPENSIVE_CHECKING |
470decc61 [PATCH] jbd2: ini... |
456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 |
/* There better not be one left behind by now! */ record = find_revoke_record(journal, bh->b_blocknr); J_ASSERT_JH(jh, record == NULL); #endif /* Finally, have we just cleared revoke on an unhashed * buffer_head? If so, we'd better make sure we clear the * revoked status on any hashed alias too, otherwise the revoke * state machine will get very upset later on. */ if (need_cancel) { struct buffer_head *bh2; bh2 = __find_get_block(bh->b_bdev, bh->b_blocknr, bh->b_size); if (bh2) { if (bh2 != bh) clear_buffer_revoked(bh2); __brelse(bh2); } } return did_revoke; } |
1ba37268c jbd2: clear revok... |
476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 |
/* * journal_clear_revoked_flag clears revoked flag of buffers in * revoke table to reflect there is no revoked buffers in the next * transaction which is going to be started. */ void jbd2_clear_buffer_revoked_flags(journal_t *journal) { struct jbd2_revoke_table_s *revoke = journal->j_revoke; int i = 0; for (i = 0; i < revoke->hash_size; i++) { struct list_head *hash_list; struct list_head *list_entry; hash_list = &revoke->hash_table[i]; list_for_each(list_entry, hash_list) { struct jbd2_revoke_record_s *record; struct buffer_head *bh; record = (struct jbd2_revoke_record_s *)list_entry; bh = __find_get_block(journal->j_fs_dev, record->blocknr, journal->j_blocksize); if (bh) { clear_buffer_revoked(bh); __brelse(bh); } } } } |
470decc61 [PATCH] jbd2: ini... |
505 506 507 508 |
/* journal_switch_revoke table select j_revoke for next transaction * we do not want to suspend any processing until all revokes are * written -bzzz */ |
f7f4bccb7 [PATCH] jbd2: ren... |
509 |
void jbd2_journal_switch_revoke_table(journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 |
{ int i; if (journal->j_revoke == journal->j_revoke_table[0]) journal->j_revoke = journal->j_revoke_table[1]; else journal->j_revoke = journal->j_revoke_table[0]; for (i = 0; i < journal->j_revoke->hash_size; i++) INIT_LIST_HEAD(&journal->j_revoke->hash_table[i]); } /* * Write revoke records to the journal for all entries in the current * revoke hash, deleting the entries as we go. |
470decc61 [PATCH] jbd2: ini... |
525 |
*/ |
f7f4bccb7 [PATCH] jbd2: ren... |
526 |
void jbd2_journal_write_revoke_records(journal_t *journal, |
67c457a8c jbd2: use SWRITE_... |
527 528 |
transaction_t *transaction, int write_op) |
470decc61 [PATCH] jbd2: ini... |
529 530 |
{ struct journal_head *descriptor; |
f7f4bccb7 [PATCH] jbd2: ren... |
531 532 |
struct jbd2_revoke_record_s *record; struct jbd2_revoke_table_s *revoke; |
470decc61 [PATCH] jbd2: ini... |
533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 |
struct list_head *hash_list; int i, offset, count; descriptor = NULL; offset = 0; count = 0; /* select revoke table for committing transaction */ revoke = journal->j_revoke == journal->j_revoke_table[0] ? journal->j_revoke_table[1] : journal->j_revoke_table[0]; for (i = 0; i < revoke->hash_size; i++) { hash_list = &revoke->hash_table[i]; while (!list_empty(hash_list)) { |
f7f4bccb7 [PATCH] jbd2: ren... |
548 |
record = (struct jbd2_revoke_record_s *) |
470decc61 [PATCH] jbd2: ini... |
549 550 551 |
hash_list->next; write_one_revoke_record(journal, transaction, &descriptor, &offset, |
67c457a8c jbd2: use SWRITE_... |
552 |
record, write_op); |
470decc61 [PATCH] jbd2: ini... |
553 554 |
count++; list_del(&record->hash); |
f7f4bccb7 [PATCH] jbd2: ren... |
555 |
kmem_cache_free(jbd2_revoke_record_cache, record); |
470decc61 [PATCH] jbd2: ini... |
556 557 558 |
} } if (descriptor) |
67c457a8c jbd2: use SWRITE_... |
559 |
flush_descriptor(journal, descriptor, offset, write_op); |
470decc61 [PATCH] jbd2: ini... |
560 561 562 563 564 565 566 567 568 569 570 571 572 |
jbd_debug(1, "Wrote %d revoke records ", count); } /* * Write out one revoke record. We need to create a new descriptor * block if the old one is full or if we have not already created one. */ static void write_one_revoke_record(journal_t *journal, transaction_t *transaction, struct journal_head **descriptorp, int *offsetp, |
67c457a8c jbd2: use SWRITE_... |
573 574 |
struct jbd2_revoke_record_s *record, int write_op) |
470decc61 [PATCH] jbd2: ini... |
575 576 577 578 579 580 581 |
{ struct journal_head *descriptor; int offset; journal_header_t *header; /* If we are already aborting, this all becomes a noop. We still need to go round the loop in |
f7f4bccb7 [PATCH] jbd2: ren... |
582 |
jbd2_journal_write_revoke_records in order to free all of the |
470decc61 [PATCH] jbd2: ini... |
583 584 585 586 587 588 589 590 591 592 |
revoke records: only the IO to the journal is omitted. */ if (is_journal_aborted(journal)) return; descriptor = *descriptorp; offset = *offsetp; /* Make sure we have a descriptor with space left for the record */ if (descriptor) { if (offset == journal->j_blocksize) { |
67c457a8c jbd2: use SWRITE_... |
593 |
flush_descriptor(journal, descriptor, offset, write_op); |
470decc61 [PATCH] jbd2: ini... |
594 595 596 597 598 |
descriptor = NULL; } } if (!descriptor) { |
f7f4bccb7 [PATCH] jbd2: ren... |
599 |
descriptor = jbd2_journal_get_descriptor_buffer(journal); |
470decc61 [PATCH] jbd2: ini... |
600 601 602 |
if (!descriptor) return; header = (journal_header_t *) &jh2bh(descriptor)->b_data[0]; |
f7f4bccb7 [PATCH] jbd2: ren... |
603 604 |
header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); header->h_blocktype = cpu_to_be32(JBD2_REVOKE_BLOCK); |
470decc61 [PATCH] jbd2: ini... |
605 606 607 608 |
header->h_sequence = cpu_to_be32(transaction->t_tid); /* Record it so that we can wait for IO completion later */ JBUFFER_TRACE(descriptor, "file as BJ_LogCtl"); |
f7f4bccb7 [PATCH] jbd2: ren... |
609 |
jbd2_journal_file_buffer(descriptor, transaction, BJ_LogCtl); |
470decc61 [PATCH] jbd2: ini... |
610 |
|
f7f4bccb7 [PATCH] jbd2: ren... |
611 |
offset = sizeof(jbd2_journal_revoke_header_t); |
470decc61 [PATCH] jbd2: ini... |
612 613 |
*descriptorp = descriptor; } |
b517bea1c [PATCH] 64-bit jb... |
614 615 616 617 618 619 620 621 622 623 |
if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) { * ((__be64 *)(&jh2bh(descriptor)->b_data[offset])) = cpu_to_be64(record->blocknr); offset += 8; } else { * ((__be32 *)(&jh2bh(descriptor)->b_data[offset])) = cpu_to_be32(record->blocknr); offset += 4; } |
470decc61 [PATCH] jbd2: ini... |
624 625 626 627 628 629 630 631 632 633 634 635 |
*offsetp = offset; } /* * Flush a revoke descriptor out to the journal. If we are aborting, * this is a noop; otherwise we are generating a buffer which needs to * be waited for during commit, so it has to go onto the appropriate * journal buffer list. */ static void flush_descriptor(journal_t *journal, struct journal_head *descriptor, |
67c457a8c jbd2: use SWRITE_... |
636 |
int offset, int write_op) |
470decc61 [PATCH] jbd2: ini... |
637 |
{ |
f7f4bccb7 [PATCH] jbd2: ren... |
638 |
jbd2_journal_revoke_header_t *header; |
470decc61 [PATCH] jbd2: ini... |
639 640 641 642 643 644 |
struct buffer_head *bh = jh2bh(descriptor); if (is_journal_aborted(journal)) { put_bh(bh); return; } |
f7f4bccb7 [PATCH] jbd2: ren... |
645 |
header = (jbd2_journal_revoke_header_t *) jh2bh(descriptor)->b_data; |
470decc61 [PATCH] jbd2: ini... |
646 647 648 649 |
header->r_count = cpu_to_be32(offset); set_buffer_jwrite(bh); BUFFER_TRACE(bh, "write"); set_buffer_dirty(bh); |
9cb569d60 remove SWRITE* I/... |
650 |
write_dirty_buffer(bh, write_op); |
470decc61 [PATCH] jbd2: ini... |
651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 |
} #endif /* * Revoke support for recovery. * * Recovery needs to be able to: * * record all revoke records, including the tid of the latest instance * of each revoke in the journal * * check whether a given block in a given transaction should be replayed * (ie. has not been revoked by a revoke record in that or a subsequent * transaction) * * empty the revoke table after recovery. */ /* * First, setting revoke records. We create a new revoke record for * every block ever revoked in the log as we scan it for recovery, and * we update the existing records if we find multiple revokes for a * single block. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
675 |
int jbd2_journal_set_revoke(journal_t *journal, |
18eba7aae [PATCH] jbd2: swi... |
676 |
unsigned long long blocknr, |
470decc61 [PATCH] jbd2: ini... |
677 678 |
tid_t sequence) { |
f7f4bccb7 [PATCH] jbd2: ren... |
679 |
struct jbd2_revoke_record_s *record; |
470decc61 [PATCH] jbd2: ini... |
680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 |
record = find_revoke_record(journal, blocknr); if (record) { /* If we have multiple occurrences, only record the * latest sequence number in the hashed record */ if (tid_gt(sequence, record->sequence)) record->sequence = sequence; return 0; } return insert_revoke_hash(journal, blocknr, sequence); } /* * Test revoke records. For a given block referenced in the log, has * that block been revoked? A revoke record with a given transaction * sequence number revokes all blocks in that transaction and earlier * ones, but later transactions still need replayed. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
698 |
int jbd2_journal_test_revoke(journal_t *journal, |
18eba7aae [PATCH] jbd2: swi... |
699 |
unsigned long long blocknr, |
470decc61 [PATCH] jbd2: ini... |
700 701 |
tid_t sequence) { |
f7f4bccb7 [PATCH] jbd2: ren... |
702 |
struct jbd2_revoke_record_s *record; |
470decc61 [PATCH] jbd2: ini... |
703 704 705 706 707 708 709 710 711 712 713 714 715 |
record = find_revoke_record(journal, blocknr); if (!record) return 0; if (tid_gt(sequence, record->sequence)) return 0; return 1; } /* * Finally, once recovery is over, we need to clear the revoke table so * that it can be reused by the running filesystem. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
716 |
void jbd2_journal_clear_revoke(journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
717 718 719 |
{ int i; struct list_head *hash_list; |
f7f4bccb7 [PATCH] jbd2: ren... |
720 721 |
struct jbd2_revoke_record_s *record; struct jbd2_revoke_table_s *revoke; |
470decc61 [PATCH] jbd2: ini... |
722 723 724 725 726 727 |
revoke = journal->j_revoke; for (i = 0; i < revoke->hash_size; i++) { hash_list = &revoke->hash_table[i]; while (!list_empty(hash_list)) { |
f7f4bccb7 [PATCH] jbd2: ren... |
728 |
record = (struct jbd2_revoke_record_s*) hash_list->next; |
470decc61 [PATCH] jbd2: ini... |
729 |
list_del(&record->hash); |
f7f4bccb7 [PATCH] jbd2: ren... |
730 |
kmem_cache_free(jbd2_revoke_record_cache, record); |
470decc61 [PATCH] jbd2: ini... |
731 732 733 |
} } } |