4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #pragma ident "@(#)zil.c 1.34 08/02/22 SMI"
28 #include <sys/zfs_context.h>
34 #include <sys/resource.h>
36 #include <sys/zil_impl.h>
37 #include <sys/dsl_dataset.h>
39 #include <sys/dmu_tx.h>
42 * The zfs intent log (ZIL) saves transaction records of system calls
43 * that change the file system in memory with enough information
44 * to be able to replay them. These are stored in memory until
45 * either the DMU transaction group (txg) commits them to the stable pool
46 * and they can be discarded, or they are flushed to the stable log
47 * (also in the pool) due to a fsync, O_DSYNC or other synchronous
48 * requirement. In the event of a panic or power fail then those log
49 * records (transactions) are replayed.
51 * There is one ZIL per file system. Its on-disk (pool) format consists
58 * A log record holds a system call transaction. Log blocks can
59 * hold many log records and the blocks are chained together.
60 * Each ZIL block contains a block pointer (blkptr_t) to the next
61 * ZIL block in the chain. The ZIL header points to the first
62 * block in the chain. Note there is not a fixed place in the pool
63 * to hold blocks. They are dynamically allocated and freed as
64 * needed from the blocks available. Figure X shows the ZIL structure:
68 * This global ZIL switch affects all pools
70 int zil_disable
= 0; /* disable intent logging */
73 * Tunable parameter for debugging or performance analysis. Setting
74 * zfs_nocacheflush will cause corruption on power loss if a volatile
75 * out-of-order write cache is enabled.
77 boolean_t zfs_nocacheflush
= B_FALSE
;
79 static kmem_cache_t
*zil_lwb_cache
;
82 zil_dva_compare(const void *x1
, const void *x2
)
84 const dva_t
*dva1
= x1
;
85 const dva_t
*dva2
= x2
;
87 if (DVA_GET_VDEV(dva1
) < DVA_GET_VDEV(dva2
))
89 if (DVA_GET_VDEV(dva1
) > DVA_GET_VDEV(dva2
))
92 if (DVA_GET_OFFSET(dva1
) < DVA_GET_OFFSET(dva2
))
94 if (DVA_GET_OFFSET(dva1
) > DVA_GET_OFFSET(dva2
))
101 zil_dva_tree_init(avl_tree_t
*t
)
103 avl_create(t
, zil_dva_compare
, sizeof (zil_dva_node_t
),
104 offsetof(zil_dva_node_t
, zn_node
));
108 zil_dva_tree_fini(avl_tree_t
*t
)
113 while ((zn
= avl_destroy_nodes(t
, &cookie
)) != NULL
)
114 kmem_free(zn
, sizeof (zil_dva_node_t
));
120 zil_dva_tree_add(avl_tree_t
*t
, dva_t
*dva
)
125 if (avl_find(t
, dva
, &where
) != NULL
)
128 zn
= kmem_alloc(sizeof (zil_dva_node_t
), KM_SLEEP
);
130 avl_insert(t
, zn
, where
);
135 static zil_header_t
*
136 zil_header_in_syncing_context(zilog_t
*zilog
)
138 return ((zil_header_t
*)zilog
->zl_header
);
142 zil_init_log_chain(zilog_t
*zilog
, blkptr_t
*bp
)
144 zio_cksum_t
*zc
= &bp
->blk_cksum
;
146 zc
->zc_word
[ZIL_ZC_GUID_0
] = spa_get_random(-1ULL);
147 zc
->zc_word
[ZIL_ZC_GUID_1
] = spa_get_random(-1ULL);
148 zc
->zc_word
[ZIL_ZC_OBJSET
] = dmu_objset_id(zilog
->zl_os
);
149 zc
->zc_word
[ZIL_ZC_SEQ
] = 1ULL;
153 * Read a log block, make sure it's valid, and byteswap it if necessary.
156 zil_read_log_block(zilog_t
*zilog
, const blkptr_t
*bp
, arc_buf_t
**abufpp
)
160 uint32_t aflags
= ARC_WAIT
;
163 zb
.zb_objset
= bp
->blk_cksum
.zc_word
[ZIL_ZC_OBJSET
];
166 zb
.zb_blkid
= bp
->blk_cksum
.zc_word
[ZIL_ZC_SEQ
];
170 error
= arc_read(NULL
, zilog
->zl_spa
, &blk
, byteswap_uint64_array
,
171 arc_getbuf_func
, abufpp
, ZIO_PRIORITY_SYNC_READ
, ZIO_FLAG_CANFAIL
|
172 ZIO_FLAG_SPECULATIVE
| ZIO_FLAG_SCRUB
, &aflags
, &zb
);
175 char *data
= (*abufpp
)->b_data
;
176 uint64_t blksz
= BP_GET_LSIZE(bp
);
177 zil_trailer_t
*ztp
= (zil_trailer_t
*)(data
+ blksz
) - 1;
178 zio_cksum_t cksum
= bp
->blk_cksum
;
181 * Sequence numbers should be... sequential. The checksum
182 * verifier for the next block should be bp's checksum plus 1.
184 cksum
.zc_word
[ZIL_ZC_SEQ
]++;
186 if (bcmp(&cksum
, &ztp
->zit_next_blk
.blk_cksum
, sizeof (cksum
)))
188 else if (BP_IS_HOLE(&ztp
->zit_next_blk
))
190 else if (ztp
->zit_nused
> (blksz
- sizeof (zil_trailer_t
)))
194 VERIFY(arc_buf_remove_ref(*abufpp
, abufpp
) == 1);
199 dprintf("error %d on %llu:%llu\n", error
, zb
.zb_objset
, zb
.zb_blkid
);
205 * Parse the intent log, and call parse_func for each valid record within.
206 * Return the highest sequence number.
209 zil_parse(zilog_t
*zilog
, zil_parse_blk_func_t
*parse_blk_func
,
210 zil_parse_lr_func_t
*parse_lr_func
, void *arg
, uint64_t txg
)
212 const zil_header_t
*zh
= zilog
->zl_header
;
213 uint64_t claim_seq
= zh
->zh_claim_seq
;
215 uint64_t max_seq
= 0;
216 blkptr_t blk
= zh
->zh_log
;
222 if (BP_IS_HOLE(&blk
))
226 * Starting at the block pointed to by zh_log we read the log chain.
227 * For each block in the chain we strongly check that block to
228 * ensure its validity. We stop when an invalid block is found.
229 * For each block pointer in the chain we call parse_blk_func().
230 * For each record in each valid block we call parse_lr_func().
231 * If the log has been claimed, stop if we encounter a sequence
232 * number greater than the highest claimed sequence number.
234 zil_dva_tree_init(&zilog
->zl_dva_tree
);
236 seq
= blk
.blk_cksum
.zc_word
[ZIL_ZC_SEQ
];
238 if (claim_seq
!= 0 && seq
> claim_seq
)
241 ASSERT(max_seq
< seq
);
244 error
= zil_read_log_block(zilog
, &blk
, &abuf
);
246 if (parse_blk_func
!= NULL
)
247 parse_blk_func(zilog
, &blk
, arg
, txg
);
252 lrbuf
= abuf
->b_data
;
253 ztp
= (zil_trailer_t
*)(lrbuf
+ BP_GET_LSIZE(&blk
)) - 1;
254 blk
= ztp
->zit_next_blk
;
256 if (parse_lr_func
== NULL
) {
257 VERIFY(arc_buf_remove_ref(abuf
, &abuf
) == 1);
261 for (lrp
= lrbuf
; lrp
< lrbuf
+ ztp
->zit_nused
; lrp
+= reclen
) {
262 lr_t
*lr
= (lr_t
*)lrp
;
263 reclen
= lr
->lrc_reclen
;
264 ASSERT3U(reclen
, >=, sizeof (lr_t
));
265 parse_lr_func(zilog
, lr
, arg
, txg
);
267 VERIFY(arc_buf_remove_ref(abuf
, &abuf
) == 1);
269 zil_dva_tree_fini(&zilog
->zl_dva_tree
);
276 zil_claim_log_block(zilog_t
*zilog
, blkptr_t
*bp
, void *tx
, uint64_t first_txg
)
278 spa_t
*spa
= zilog
->zl_spa
;
282 * Claim log block if not already committed and not already claimed.
284 if (bp
->blk_birth
>= first_txg
&&
285 zil_dva_tree_add(&zilog
->zl_dva_tree
, BP_IDENTITY(bp
)) == 0) {
286 err
= zio_wait(zio_claim(NULL
, spa
, first_txg
, bp
, NULL
, NULL
));
292 zil_claim_log_record(zilog_t
*zilog
, lr_t
*lrc
, void *tx
, uint64_t first_txg
)
294 if (lrc
->lrc_txtype
== TX_WRITE
) {
295 lr_write_t
*lr
= (lr_write_t
*)lrc
;
296 zil_claim_log_block(zilog
, &lr
->lr_blkptr
, tx
, first_txg
);
302 zil_free_log_block(zilog_t
*zilog
, blkptr_t
*bp
, void *tx
, uint64_t claim_txg
)
304 zio_free_blk(zilog
->zl_spa
, bp
, dmu_tx_get_txg(tx
));
308 zil_free_log_record(zilog_t
*zilog
, lr_t
*lrc
, void *tx
, uint64_t claim_txg
)
311 * If we previously claimed it, we need to free it.
313 if (claim_txg
!= 0 && lrc
->lrc_txtype
== TX_WRITE
) {
314 lr_write_t
*lr
= (lr_write_t
*)lrc
;
315 blkptr_t
*bp
= &lr
->lr_blkptr
;
316 if (bp
->blk_birth
>= claim_txg
&&
317 !zil_dva_tree_add(&zilog
->zl_dva_tree
, BP_IDENTITY(bp
))) {
318 (void) arc_free(NULL
, zilog
->zl_spa
,
319 dmu_tx_get_txg(tx
), bp
, NULL
, NULL
, ARC_WAIT
);
325 * Create an on-disk intent log.
328 zil_create(zilog_t
*zilog
)
330 const zil_header_t
*zh
= zilog
->zl_header
;
338 * Wait for any previous destroy to complete.
340 txg_wait_synced(zilog
->zl_dmu_pool
, zilog
->zl_destroy_txg
);
342 ASSERT(zh
->zh_claim_txg
== 0);
343 ASSERT(zh
->zh_replay_seq
== 0);
348 * If we don't already have an initial log block, allocate one now.
350 if (BP_IS_HOLE(&blk
)) {
351 tx
= dmu_tx_create(zilog
->zl_os
);
352 (void) dmu_tx_assign(tx
, TXG_WAIT
);
353 dsl_dataset_dirty(dmu_objset_ds(zilog
->zl_os
), tx
);
354 txg
= dmu_tx_get_txg(tx
);
356 error
= zio_alloc_blk(zilog
->zl_spa
, ZIL_MIN_BLKSZ
, &blk
,
360 zil_init_log_chain(zilog
, &blk
);
364 * Allocate a log write buffer (lwb) for the first log block.
367 lwb
= kmem_cache_alloc(zil_lwb_cache
, KM_SLEEP
);
368 lwb
->lwb_zilog
= zilog
;
371 lwb
->lwb_sz
= BP_GET_LSIZE(&lwb
->lwb_blk
);
372 lwb
->lwb_buf
= zio_buf_alloc(lwb
->lwb_sz
);
373 lwb
->lwb_max_txg
= txg
;
376 mutex_enter(&zilog
->zl_lock
);
377 list_insert_tail(&zilog
->zl_lwb_list
, lwb
);
378 mutex_exit(&zilog
->zl_lock
);
382 * If we just allocated the first log block, commit our transaction
383 * and wait for zil_sync() to stuff the block poiner into zh_log.
384 * (zh is part of the MOS, so we cannot modify it in open context.)
388 txg_wait_synced(zilog
->zl_dmu_pool
, txg
);
391 ASSERT(bcmp(&blk
, &zh
->zh_log
, sizeof (blk
)) == 0);
395 * In one tx, free all log blocks and clear the log header.
396 * If keep_first is set, then we're replaying a log with no content.
397 * We want to keep the first block, however, so that the first
398 * synchronous transaction doesn't require a txg_wait_synced()
399 * in zil_create(). We don't need to txg_wait_synced() here either
400 * when keep_first is set, because both zil_create() and zil_destroy()
401 * will wait for any in-progress destroys to complete.
404 zil_destroy(zilog_t
*zilog
, boolean_t keep_first
)
406 const zil_header_t
*zh
= zilog
->zl_header
;
412 * Wait for any previous destroy to complete.
414 txg_wait_synced(zilog
->zl_dmu_pool
, zilog
->zl_destroy_txg
);
416 if (BP_IS_HOLE(&zh
->zh_log
))
419 tx
= dmu_tx_create(zilog
->zl_os
);
420 (void) dmu_tx_assign(tx
, TXG_WAIT
);
421 dsl_dataset_dirty(dmu_objset_ds(zilog
->zl_os
), tx
);
422 txg
= dmu_tx_get_txg(tx
);
424 mutex_enter(&zilog
->zl_lock
);
427 * It is possible for the ZIL to get the previously mounted zilog
428 * structure of the same dataset if quickly remounted and the dbuf
429 * eviction has not completed. In this case we can see a non
430 * empty lwb list and keep_first will be set. We fix this by
431 * clearing the keep_first. This will be slower but it's very rare.
433 if (!list_is_empty(&zilog
->zl_lwb_list
) && keep_first
)
434 keep_first
= B_FALSE
;
436 ASSERT3U(zilog
->zl_destroy_txg
, <, txg
);
437 zilog
->zl_destroy_txg
= txg
;
438 zilog
->zl_keep_first
= keep_first
;
440 if (!list_is_empty(&zilog
->zl_lwb_list
)) {
441 ASSERT(zh
->zh_claim_txg
== 0);
443 while ((lwb
= list_head(&zilog
->zl_lwb_list
)) != NULL
) {
444 list_remove(&zilog
->zl_lwb_list
, lwb
);
445 if (lwb
->lwb_buf
!= NULL
)
446 zio_buf_free(lwb
->lwb_buf
, lwb
->lwb_sz
);
447 zio_free_blk(zilog
->zl_spa
, &lwb
->lwb_blk
, txg
);
448 kmem_cache_free(zil_lwb_cache
, lwb
);
452 (void) zil_parse(zilog
, zil_free_log_block
,
453 zil_free_log_record
, tx
, zh
->zh_claim_txg
);
456 mutex_exit(&zilog
->zl_lock
);
462 * zil_rollback_destroy() is only called by the rollback code.
463 * We already have a syncing tx. Rollback has exclusive access to the
464 * dataset, so we don't have to worry about concurrent zil access.
465 * The actual freeing of any log blocks occurs in zil_sync() later in
466 * this txg syncing phase.
469 zil_rollback_destroy(zilog_t
*zilog
, dmu_tx_t
*tx
)
471 const zil_header_t
*zh
= zilog
->zl_header
;
474 if (BP_IS_HOLE(&zh
->zh_log
))
477 txg
= dmu_tx_get_txg(tx
);
478 ASSERT3U(zilog
->zl_destroy_txg
, <, txg
);
479 zilog
->zl_destroy_txg
= txg
;
480 zilog
->zl_keep_first
= B_FALSE
;
483 * Ensure there's no outstanding ZIL IO. No lwbs or just the
484 * unused one that allocated in advance is ok.
486 ASSERT(zilog
->zl_lwb_list
.list_head
.list_next
==
487 zilog
->zl_lwb_list
.list_head
.list_prev
);
488 (void) zil_parse(zilog
, zil_free_log_block
, zil_free_log_record
,
489 tx
, zh
->zh_claim_txg
);
493 zil_claim(char *osname
, void *txarg
)
495 dmu_tx_t
*tx
= txarg
;
496 uint64_t first_txg
= dmu_tx_get_txg(tx
);
502 error
= dmu_objset_open(osname
, DMU_OST_ANY
, DS_MODE_STANDARD
, &os
);
504 cmn_err(CE_WARN
, "can't process intent log for %s", osname
);
508 zilog
= dmu_objset_zil(os
);
509 zh
= zil_header_in_syncing_context(zilog
);
512 * Claim all log blocks if we haven't already done so, and remember
513 * the highest claimed sequence number. This ensures that if we can
514 * read only part of the log now (e.g. due to a missing device),
515 * but we can read the entire log later, we will not try to replay
516 * or destroy beyond the last block we successfully claimed.
518 ASSERT3U(zh
->zh_claim_txg
, <=, first_txg
);
519 if (zh
->zh_claim_txg
== 0 && !BP_IS_HOLE(&zh
->zh_log
)) {
520 zh
->zh_claim_txg
= first_txg
;
521 zh
->zh_claim_seq
= zil_parse(zilog
, zil_claim_log_block
,
522 zil_claim_log_record
, tx
, first_txg
);
523 dsl_dataset_dirty(dmu_objset_ds(os
), tx
);
526 ASSERT3U(first_txg
, ==, (spa_last_synced_txg(zilog
->zl_spa
) + 1));
527 dmu_objset_close(os
);
532 zil_vdev_compare(const void *x1
, const void *x2
)
534 uint64_t v1
= ((zil_vdev_node_t
*)x1
)->zv_vdev
;
535 uint64_t v2
= ((zil_vdev_node_t
*)x2
)->zv_vdev
;
546 zil_add_block(zilog_t
*zilog
, blkptr_t
*bp
)
548 avl_tree_t
*t
= &zilog
->zl_vdev_tree
;
550 zil_vdev_node_t
*zv
, zvsearch
;
551 int ndvas
= BP_GET_NDVAS(bp
);
554 if (zfs_nocacheflush
)
557 ASSERT(zilog
->zl_writer
);
560 * Even though we're zl_writer, we still need a lock because the
561 * zl_get_data() callbacks may have dmu_sync() done callbacks
562 * that will run concurrently.
564 mutex_enter(&zilog
->zl_vdev_lock
);
565 for (i
= 0; i
< ndvas
; i
++) {
566 zvsearch
.zv_vdev
= DVA_GET_VDEV(&bp
->blk_dva
[i
]);
567 if (avl_find(t
, &zvsearch
, &where
) == NULL
) {
568 zv
= kmem_alloc(sizeof (*zv
), KM_SLEEP
);
569 zv
->zv_vdev
= zvsearch
.zv_vdev
;
570 avl_insert(t
, zv
, where
);
573 mutex_exit(&zilog
->zl_vdev_lock
);
577 zil_flush_vdevs(zilog_t
*zilog
)
579 spa_t
*spa
= zilog
->zl_spa
;
580 avl_tree_t
*t
= &zilog
->zl_vdev_tree
;
585 ASSERT(zilog
->zl_writer
);
588 * We don't need zl_vdev_lock here because we're the zl_writer,
589 * and all zl_get_data() callbacks are done.
591 if (avl_numnodes(t
) == 0)
594 spa_config_enter(spa
, RW_READER
, FTAG
);
596 zio
= zio_root(spa
, NULL
, NULL
,
597 ZIO_FLAG_CONFIG_HELD
| ZIO_FLAG_CANFAIL
);
599 while ((zv
= avl_destroy_nodes(t
, &cookie
)) != NULL
) {
600 vdev_t
*vd
= vdev_lookup_top(spa
, zv
->zv_vdev
);
603 kmem_free(zv
, sizeof (*zv
));
607 * Wait for all the flushes to complete. Not all devices actually
608 * support the DKIOCFLUSHWRITECACHE ioctl, so it's OK if it fails.
610 (void) zio_wait(zio
);
612 spa_config_exit(spa
, FTAG
);
616 * Function called when a log block write completes
619 zil_lwb_write_done(zio_t
*zio
)
621 lwb_t
*lwb
= zio
->io_private
;
622 zilog_t
*zilog
= lwb
->lwb_zilog
;
625 * Now that we've written this log block, we have a stable pointer
626 * to the next block in the chain, so it's OK to let the txg in
627 * which we allocated the next block sync.
629 txg_rele_to_sync(&lwb
->lwb_txgh
);
631 zio_buf_free(lwb
->lwb_buf
, lwb
->lwb_sz
);
632 mutex_enter(&zilog
->zl_lock
);
635 zilog
->zl_log_error
= B_TRUE
;
636 mutex_exit(&zilog
->zl_lock
);
640 * Initialize the io for a log block.
642 * Note, we should not initialize the IO until we are about
643 * to use it, since zio_rewrite() does a spa_config_enter().
646 zil_lwb_write_init(zilog_t
*zilog
, lwb_t
*lwb
)
650 zb
.zb_objset
= lwb
->lwb_blk
.blk_cksum
.zc_word
[ZIL_ZC_OBJSET
];
653 zb
.zb_blkid
= lwb
->lwb_blk
.blk_cksum
.zc_word
[ZIL_ZC_SEQ
];
655 if (zilog
->zl_root_zio
== NULL
) {
656 zilog
->zl_root_zio
= zio_root(zilog
->zl_spa
, NULL
, NULL
,
659 if (lwb
->lwb_zio
== NULL
) {
660 lwb
->lwb_zio
= zio_rewrite(zilog
->zl_root_zio
, zilog
->zl_spa
,
661 ZIO_CHECKSUM_ZILOG
, 0, &lwb
->lwb_blk
, lwb
->lwb_buf
,
662 lwb
->lwb_sz
, zil_lwb_write_done
, lwb
,
663 ZIO_PRIORITY_LOG_WRITE
, ZIO_FLAG_CANFAIL
, &zb
);
668 * Start a log block write and advance to the next log block.
669 * Calls are serialized.
672 zil_lwb_write_start(zilog_t
*zilog
, lwb_t
*lwb
)
675 zil_trailer_t
*ztp
= (zil_trailer_t
*)(lwb
->lwb_buf
+ lwb
->lwb_sz
) - 1;
676 spa_t
*spa
= zilog
->zl_spa
;
677 blkptr_t
*bp
= &ztp
->zit_next_blk
;
682 ASSERT(lwb
->lwb_nused
<= ZIL_BLK_DATA_SZ(lwb
));
685 * Allocate the next block and save its address in this block
686 * before writing it in order to establish the log chain.
687 * Note that if the allocation of nlwb synced before we wrote
688 * the block that points at it (lwb), we'd leak it if we crashed.
689 * Therefore, we don't do txg_rele_to_sync() until zil_lwb_write_done().
691 txg
= txg_hold_open(zilog
->zl_dmu_pool
, &lwb
->lwb_txgh
);
692 txg_rele_to_quiesce(&lwb
->lwb_txgh
);
695 * Pick a ZIL blocksize. We request a size that is the
696 * maximum of the previous used size, the current used size and
697 * the amount waiting in the queue.
699 zil_blksz
= MAX(zilog
->zl_prev_used
,
700 zilog
->zl_cur_used
+ sizeof (*ztp
));
701 zil_blksz
= MAX(zil_blksz
, zilog
->zl_itx_list_sz
+ sizeof (*ztp
));
702 zil_blksz
= P2ROUNDUP_TYPED(zil_blksz
, ZIL_MIN_BLKSZ
, uint64_t);
703 if (zil_blksz
> ZIL_MAX_BLKSZ
)
704 zil_blksz
= ZIL_MAX_BLKSZ
;
707 /* pass the old blkptr in order to spread log blocks across devs */
708 error
= zio_alloc_blk(spa
, zil_blksz
, bp
, &lwb
->lwb_blk
, txg
);
710 dmu_tx_t
*tx
= dmu_tx_create_assigned(zilog
->zl_dmu_pool
, txg
);
713 * We dirty the dataset to ensure that zil_sync() will
714 * be called to remove this lwb from our zl_lwb_list.
715 * Failing to do so, may leave an lwb with a NULL lwb_buf
716 * hanging around on the zl_lwb_list.
718 dsl_dataset_dirty(dmu_objset_ds(zilog
->zl_os
), tx
);
722 * Since we've just experienced an allocation failure so we
723 * terminate the current lwb and send it on its way.
726 ztp
->zit_nused
= lwb
->lwb_nused
;
727 ztp
->zit_bt
.zbt_cksum
= lwb
->lwb_blk
.blk_cksum
;
728 zio_nowait(lwb
->lwb_zio
);
731 * By returning NULL the caller will call tx_wait_synced()
736 ASSERT3U(bp
->blk_birth
, ==, txg
);
738 ztp
->zit_nused
= lwb
->lwb_nused
;
739 ztp
->zit_bt
.zbt_cksum
= lwb
->lwb_blk
.blk_cksum
;
740 bp
->blk_cksum
= lwb
->lwb_blk
.blk_cksum
;
741 bp
->blk_cksum
.zc_word
[ZIL_ZC_SEQ
]++;
744 * Allocate a new log write buffer (lwb).
746 nlwb
= kmem_cache_alloc(zil_lwb_cache
, KM_SLEEP
);
748 nlwb
->lwb_zilog
= zilog
;
751 nlwb
->lwb_sz
= BP_GET_LSIZE(&nlwb
->lwb_blk
);
752 nlwb
->lwb_buf
= zio_buf_alloc(nlwb
->lwb_sz
);
753 nlwb
->lwb_max_txg
= txg
;
754 nlwb
->lwb_zio
= NULL
;
757 * Put new lwb at the end of the log chain
759 mutex_enter(&zilog
->zl_lock
);
760 list_insert_tail(&zilog
->zl_lwb_list
, nlwb
);
761 mutex_exit(&zilog
->zl_lock
);
763 /* Record the block for later vdev flushing */
764 zil_add_block(zilog
, &lwb
->lwb_blk
);
767 * kick off the write for the old log block
769 dprintf_bp(&lwb
->lwb_blk
, "lwb %p txg %llu: ", lwb
, txg
);
770 ASSERT(lwb
->lwb_zio
);
771 zio_nowait(lwb
->lwb_zio
);
777 zil_lwb_commit(zilog_t
*zilog
, itx_t
*itx
, lwb_t
*lwb
)
779 lr_t
*lrc
= &itx
->itx_lr
; /* common log record */
780 lr_write_t
*lr
= (lr_write_t
*)lrc
;
781 uint64_t txg
= lrc
->lrc_txg
;
782 uint64_t reclen
= lrc
->lrc_reclen
;
787 ASSERT(lwb
->lwb_buf
!= NULL
);
789 if (lrc
->lrc_txtype
== TX_WRITE
&& itx
->itx_wr_state
== WR_NEED_COPY
)
790 dlen
= P2ROUNDUP_TYPED(
791 lr
->lr_length
, sizeof (uint64_t), uint64_t);
795 zilog
->zl_cur_used
+= (reclen
+ dlen
);
797 zil_lwb_write_init(zilog
, lwb
);
800 * If this record won't fit in the current log block, start a new one.
802 if (lwb
->lwb_nused
+ reclen
+ dlen
> ZIL_BLK_DATA_SZ(lwb
)) {
803 lwb
= zil_lwb_write_start(zilog
, lwb
);
806 zil_lwb_write_init(zilog
, lwb
);
807 ASSERT(lwb
->lwb_nused
== 0);
808 if (reclen
+ dlen
> ZIL_BLK_DATA_SZ(lwb
)) {
809 txg_wait_synced(zilog
->zl_dmu_pool
, txg
);
815 * Update the lrc_seq, to be log record sequence number. See zil.h
816 * Then copy the record to the log buffer.
818 lrc
->lrc_seq
= ++zilog
->zl_lr_seq
; /* we are single threaded */
819 bcopy(lrc
, lwb
->lwb_buf
+ lwb
->lwb_nused
, reclen
);
822 * If it's a write, fetch the data or get its blkptr as appropriate.
824 if (lrc
->lrc_txtype
== TX_WRITE
) {
825 if (txg
> spa_freeze_txg(zilog
->zl_spa
))
826 txg_wait_synced(zilog
->zl_dmu_pool
, txg
);
827 if (itx
->itx_wr_state
!= WR_COPIED
) {
831 /* alignment is guaranteed */
832 lr
= (lr_write_t
*)(lwb
->lwb_buf
+ lwb
->lwb_nused
);
834 ASSERT(itx
->itx_wr_state
== WR_NEED_COPY
);
835 dbuf
= lwb
->lwb_buf
+ lwb
->lwb_nused
+ reclen
;
836 lr
->lr_common
.lrc_reclen
+= dlen
;
838 ASSERT(itx
->itx_wr_state
== WR_INDIRECT
);
841 error
= zilog
->zl_get_data(
842 itx
->itx_private
, lr
, dbuf
, lwb
->lwb_zio
);
844 ASSERT(error
== ENOENT
|| error
== EEXIST
||
851 lwb
->lwb_nused
+= reclen
+ dlen
;
852 lwb
->lwb_max_txg
= MAX(lwb
->lwb_max_txg
, txg
);
853 ASSERT3U(lwb
->lwb_nused
, <=, ZIL_BLK_DATA_SZ(lwb
));
854 ASSERT3U(P2PHASE(lwb
->lwb_nused
, sizeof (uint64_t)), ==, 0);
860 zil_itx_create(uint64_t txtype
, size_t lrsize
)
864 lrsize
= P2ROUNDUP_TYPED(lrsize
, sizeof (uint64_t), size_t);
866 itx
= kmem_alloc(offsetof(itx_t
, itx_lr
) + lrsize
, KM_SLEEP
);
867 itx
->itx_lr
.lrc_txtype
= txtype
;
868 itx
->itx_lr
.lrc_reclen
= lrsize
;
869 itx
->itx_sod
= lrsize
; /* if write & WR_NEED_COPY will be increased */
870 itx
->itx_lr
.lrc_seq
= 0; /* defensive */
876 zil_itx_assign(zilog_t
*zilog
, itx_t
*itx
, dmu_tx_t
*tx
)
880 ASSERT(itx
->itx_lr
.lrc_seq
== 0);
882 mutex_enter(&zilog
->zl_lock
);
883 list_insert_tail(&zilog
->zl_itx_list
, itx
);
884 zilog
->zl_itx_list_sz
+= itx
->itx_sod
;
885 itx
->itx_lr
.lrc_txg
= dmu_tx_get_txg(tx
);
886 itx
->itx_lr
.lrc_seq
= seq
= ++zilog
->zl_itx_seq
;
887 mutex_exit(&zilog
->zl_lock
);
893 * Free up all in-memory intent log transactions that have now been synced.
896 zil_itx_clean(zilog_t
*zilog
)
898 uint64_t synced_txg
= spa_last_synced_txg(zilog
->zl_spa
);
899 uint64_t freeze_txg
= spa_freeze_txg(zilog
->zl_spa
);
903 list_create(&clean_list
, sizeof (itx_t
), offsetof(itx_t
, itx_node
));
905 mutex_enter(&zilog
->zl_lock
);
906 /* wait for a log writer to finish walking list */
907 while (zilog
->zl_writer
) {
908 cv_wait(&zilog
->zl_cv_writer
, &zilog
->zl_lock
);
912 * Move the sync'd log transactions to a separate list so we can call
913 * kmem_free without holding the zl_lock.
915 * There is no need to set zl_writer as we don't drop zl_lock here
917 while ((itx
= list_head(&zilog
->zl_itx_list
)) != NULL
&&
918 itx
->itx_lr
.lrc_txg
<= MIN(synced_txg
, freeze_txg
)) {
919 list_remove(&zilog
->zl_itx_list
, itx
);
920 zilog
->zl_itx_list_sz
-= itx
->itx_sod
;
921 list_insert_tail(&clean_list
, itx
);
923 cv_broadcast(&zilog
->zl_cv_writer
);
924 mutex_exit(&zilog
->zl_lock
);
926 /* destroy sync'd log transactions */
927 while ((itx
= list_head(&clean_list
)) != NULL
) {
928 list_remove(&clean_list
, itx
);
929 kmem_free(itx
, offsetof(itx_t
, itx_lr
)
930 + itx
->itx_lr
.lrc_reclen
);
932 list_destroy(&clean_list
);
936 * If there are any in-memory intent log transactions which have now been
937 * synced then start up a taskq to free them.
940 zil_clean(zilog_t
*zilog
)
944 mutex_enter(&zilog
->zl_lock
);
945 itx
= list_head(&zilog
->zl_itx_list
);
947 (itx
->itx_lr
.lrc_txg
<= spa_last_synced_txg(zilog
->zl_spa
))) {
948 (void) taskq_dispatch(zilog
->zl_clean_taskq
,
949 (void (*)(void *))zil_itx_clean
, zilog
, TQ_NOSLEEP
);
951 mutex_exit(&zilog
->zl_lock
);
955 zil_commit_writer(zilog_t
*zilog
, uint64_t seq
, uint64_t foid
)
958 uint64_t commit_seq
= 0;
959 itx_t
*itx
, *itx_next
= (itx_t
*)-1;
963 zilog
->zl_writer
= B_TRUE
;
964 zilog
->zl_root_zio
= NULL
;
967 if (zilog
->zl_suspend
) {
970 lwb
= list_tail(&zilog
->zl_lwb_list
);
973 * Return if there's nothing to flush before we
974 * dirty the fs by calling zil_create()
976 if (list_is_empty(&zilog
->zl_itx_list
)) {
977 zilog
->zl_writer
= B_FALSE
;
980 mutex_exit(&zilog
->zl_lock
);
982 mutex_enter(&zilog
->zl_lock
);
983 lwb
= list_tail(&zilog
->zl_lwb_list
);
987 /* Loop through in-memory log transactions filling log blocks. */
988 DTRACE_PROBE1(zil__cw1
, zilog_t
*, zilog
);
991 * Find the next itx to push:
992 * Push all transactions related to specified foid and all
993 * other transactions except TX_WRITE, TX_TRUNCATE,
994 * TX_SETATTR and TX_ACL for all other files.
996 if (itx_next
!= (itx_t
*)-1)
999 itx
= list_head(&zilog
->zl_itx_list
);
1000 for (; itx
!= NULL
; itx
= list_next(&zilog
->zl_itx_list
, itx
)) {
1001 if (foid
== 0) /* push all foids? */
1003 if (itx
->itx_sync
) /* push all O_[D]SYNC */
1005 switch (itx
->itx_lr
.lrc_txtype
) {
1010 /* lr_foid is same offset for these records */
1011 if (((lr_write_t
*)&itx
->itx_lr
)->lr_foid
1013 continue; /* skip this record */
1021 if ((itx
->itx_lr
.lrc_seq
> seq
) &&
1022 ((lwb
== NULL
) || (lwb
->lwb_nused
== 0) ||
1023 (lwb
->lwb_nused
+ itx
->itx_sod
> ZIL_BLK_DATA_SZ(lwb
)))) {
1028 * Save the next pointer. Even though we soon drop
1029 * zl_lock all threads that may change the list
1030 * (another writer or zil_itx_clean) can't do so until
1031 * they have zl_writer.
1033 itx_next
= list_next(&zilog
->zl_itx_list
, itx
);
1034 list_remove(&zilog
->zl_itx_list
, itx
);
1035 zilog
->zl_itx_list_sz
-= itx
->itx_sod
;
1036 mutex_exit(&zilog
->zl_lock
);
1037 txg
= itx
->itx_lr
.lrc_txg
;
1040 if (txg
> spa_last_synced_txg(spa
) ||
1041 txg
> spa_freeze_txg(spa
))
1042 lwb
= zil_lwb_commit(zilog
, itx
, lwb
);
1043 kmem_free(itx
, offsetof(itx_t
, itx_lr
)
1044 + itx
->itx_lr
.lrc_reclen
);
1045 mutex_enter(&zilog
->zl_lock
);
1047 DTRACE_PROBE1(zil__cw2
, zilog_t
*, zilog
);
1048 /* determine commit sequence number */
1049 itx
= list_head(&zilog
->zl_itx_list
);
1051 commit_seq
= itx
->itx_lr
.lrc_seq
;
1053 commit_seq
= zilog
->zl_itx_seq
;
1054 mutex_exit(&zilog
->zl_lock
);
1056 /* write the last block out */
1057 if (lwb
!= NULL
&& lwb
->lwb_zio
!= NULL
)
1058 lwb
= zil_lwb_write_start(zilog
, lwb
);
1060 zilog
->zl_prev_used
= zilog
->zl_cur_used
;
1061 zilog
->zl_cur_used
= 0;
1064 * Wait if necessary for the log blocks to be on stable storage.
1066 if (zilog
->zl_root_zio
) {
1067 DTRACE_PROBE1(zil__cw3
, zilog_t
*, zilog
);
1068 (void) zio_wait(zilog
->zl_root_zio
);
1069 DTRACE_PROBE1(zil__cw4
, zilog_t
*, zilog
);
1070 zil_flush_vdevs(zilog
);
1073 if (zilog
->zl_log_error
|| lwb
== NULL
) {
1074 zilog
->zl_log_error
= 0;
1075 txg_wait_synced(zilog
->zl_dmu_pool
, 0);
1078 mutex_enter(&zilog
->zl_lock
);
1079 zilog
->zl_writer
= B_FALSE
;
1081 ASSERT3U(commit_seq
, >=, zilog
->zl_commit_seq
);
1082 zilog
->zl_commit_seq
= commit_seq
;
1086 * Push zfs transactions to stable storage up to the supplied sequence number.
1087 * If foid is 0 push out all transactions, otherwise push only those
1088 * for that file or might have been used to create that file.
1091 zil_commit(zilog_t
*zilog
, uint64_t seq
, uint64_t foid
)
1093 if (zilog
== NULL
|| seq
== 0)
1096 mutex_enter(&zilog
->zl_lock
);
1098 seq
= MIN(seq
, zilog
->zl_itx_seq
); /* cap seq at largest itx seq */
1100 while (zilog
->zl_writer
) {
1101 cv_wait(&zilog
->zl_cv_writer
, &zilog
->zl_lock
);
1102 if (seq
< zilog
->zl_commit_seq
) {
1103 mutex_exit(&zilog
->zl_lock
);
1107 zil_commit_writer(zilog
, seq
, foid
); /* drops zl_lock */
1108 /* wake up others waiting on the commit */
1109 cv_broadcast(&zilog
->zl_cv_writer
);
1110 mutex_exit(&zilog
->zl_lock
);
1114 * Called in syncing context to free committed log blocks and update log header.
1117 zil_sync(zilog_t
*zilog
, dmu_tx_t
*tx
)
1119 zil_header_t
*zh
= zil_header_in_syncing_context(zilog
);
1120 uint64_t txg
= dmu_tx_get_txg(tx
);
1121 spa_t
*spa
= zilog
->zl_spa
;
1124 mutex_enter(&zilog
->zl_lock
);
1126 ASSERT(zilog
->zl_stop_sync
== 0);
1128 zh
->zh_replay_seq
= zilog
->zl_replay_seq
[txg
& TXG_MASK
];
1130 if (zilog
->zl_destroy_txg
== txg
) {
1131 blkptr_t blk
= zh
->zh_log
;
1133 ASSERT(list_head(&zilog
->zl_lwb_list
) == NULL
);
1134 ASSERT(spa_sync_pass(spa
) == 1);
1136 bzero(zh
, sizeof (zil_header_t
));
1137 bzero(zilog
->zl_replay_seq
, sizeof (zilog
->zl_replay_seq
));
1139 if (zilog
->zl_keep_first
) {
1141 * If this block was part of log chain that couldn't
1142 * be claimed because a device was missing during
1143 * zil_claim(), but that device later returns,
1144 * then this block could erroneously appear valid.
1145 * To guard against this, assign a new GUID to the new
1146 * log chain so it doesn't matter what blk points to.
1148 zil_init_log_chain(zilog
, &blk
);
1154 lwb
= list_head(&zilog
->zl_lwb_list
);
1156 mutex_exit(&zilog
->zl_lock
);
1159 zh
->zh_log
= lwb
->lwb_blk
;
1160 if (lwb
->lwb_buf
!= NULL
|| lwb
->lwb_max_txg
> txg
)
1162 list_remove(&zilog
->zl_lwb_list
, lwb
);
1163 zio_free_blk(spa
, &lwb
->lwb_blk
, txg
);
1164 kmem_cache_free(zil_lwb_cache
, lwb
);
1167 * If we don't have anything left in the lwb list then
1168 * we've had an allocation failure and we need to zero
1169 * out the zil_header blkptr so that we don't end
1170 * up freeing the same block twice.
1172 if (list_head(&zilog
->zl_lwb_list
) == NULL
)
1173 BP_ZERO(&zh
->zh_log
);
1175 mutex_exit(&zilog
->zl_lock
);
1181 zil_lwb_cache
= kmem_cache_create("zil_lwb_cache",
1182 sizeof (struct lwb
), 0, NULL
, NULL
, NULL
, NULL
, NULL
, 0);
1188 kmem_cache_destroy(zil_lwb_cache
);
1192 zil_alloc(objset_t
*os
, zil_header_t
*zh_phys
)
1196 zilog
= kmem_zalloc(sizeof (zilog_t
), KM_SLEEP
);
1198 zilog
->zl_header
= zh_phys
;
1200 zilog
->zl_spa
= dmu_objset_spa(os
);
1201 zilog
->zl_dmu_pool
= dmu_objset_pool(os
);
1202 zilog
->zl_destroy_txg
= TXG_INITIAL
- 1;
1204 mutex_init(&zilog
->zl_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1206 list_create(&zilog
->zl_itx_list
, sizeof (itx_t
),
1207 offsetof(itx_t
, itx_node
));
1209 list_create(&zilog
->zl_lwb_list
, sizeof (lwb_t
),
1210 offsetof(lwb_t
, lwb_node
));
1212 mutex_init(&zilog
->zl_vdev_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1214 avl_create(&zilog
->zl_vdev_tree
, zil_vdev_compare
,
1215 sizeof (zil_vdev_node_t
), offsetof(zil_vdev_node_t
, zv_node
));
1217 cv_init(&zilog
->zl_cv_writer
, NULL
, CV_DEFAULT
, NULL
);
1218 cv_init(&zilog
->zl_cv_suspend
, NULL
, CV_DEFAULT
, NULL
);
1224 zil_free(zilog_t
*zilog
)
1228 zilog
->zl_stop_sync
= 1;
1230 while ((lwb
= list_head(&zilog
->zl_lwb_list
)) != NULL
) {
1231 list_remove(&zilog
->zl_lwb_list
, lwb
);
1232 if (lwb
->lwb_buf
!= NULL
)
1233 zio_buf_free(lwb
->lwb_buf
, lwb
->lwb_sz
);
1234 kmem_cache_free(zil_lwb_cache
, lwb
);
1236 list_destroy(&zilog
->zl_lwb_list
);
1238 avl_destroy(&zilog
->zl_vdev_tree
);
1239 mutex_destroy(&zilog
->zl_vdev_lock
);
1241 ASSERT(list_head(&zilog
->zl_itx_list
) == NULL
);
1242 list_destroy(&zilog
->zl_itx_list
);
1243 mutex_destroy(&zilog
->zl_lock
);
1245 cv_destroy(&zilog
->zl_cv_writer
);
1246 cv_destroy(&zilog
->zl_cv_suspend
);
1248 kmem_free(zilog
, sizeof (zilog_t
));
1252 * return true if the initial log block is not valid
1255 zil_empty(zilog_t
*zilog
)
1257 const zil_header_t
*zh
= zilog
->zl_header
;
1258 arc_buf_t
*abuf
= NULL
;
1260 if (BP_IS_HOLE(&zh
->zh_log
))
1263 if (zil_read_log_block(zilog
, &zh
->zh_log
, &abuf
) != 0)
1266 VERIFY(arc_buf_remove_ref(abuf
, &abuf
) == 1);
1271 * Open an intent log.
1274 zil_open(objset_t
*os
, zil_get_data_t
*get_data
)
1276 zilog_t
*zilog
= dmu_objset_zil(os
);
1278 zilog
->zl_get_data
= get_data
;
1279 zilog
->zl_clean_taskq
= taskq_create("zil_clean", 1, minclsyspri
,
1280 2, 2, TASKQ_PREPOPULATE
);
1286 * Close an intent log.
1289 zil_close(zilog_t
*zilog
)
1292 * If the log isn't already committed, mark the objset dirty
1293 * (so zil_sync() will be called) and wait for that txg to sync.
1295 if (!zil_is_committed(zilog
)) {
1297 dmu_tx_t
*tx
= dmu_tx_create(zilog
->zl_os
);
1298 (void) dmu_tx_assign(tx
, TXG_WAIT
);
1299 dsl_dataset_dirty(dmu_objset_ds(zilog
->zl_os
), tx
);
1300 txg
= dmu_tx_get_txg(tx
);
1302 txg_wait_synced(zilog
->zl_dmu_pool
, txg
);
1305 taskq_destroy(zilog
->zl_clean_taskq
);
1306 zilog
->zl_clean_taskq
= NULL
;
1307 zilog
->zl_get_data
= NULL
;
1309 zil_itx_clean(zilog
);
1310 ASSERT(list_head(&zilog
->zl_itx_list
) == NULL
);
1314 * Suspend an intent log. While in suspended mode, we still honor
1315 * synchronous semantics, but we rely on txg_wait_synced() to do it.
1316 * We suspend the log briefly when taking a snapshot so that the snapshot
1317 * contains all the data it's supposed to, and has an empty intent log.
1320 zil_suspend(zilog_t
*zilog
)
1322 const zil_header_t
*zh
= zilog
->zl_header
;
1324 mutex_enter(&zilog
->zl_lock
);
1325 if (zh
->zh_claim_txg
!= 0) { /* unplayed log */
1326 mutex_exit(&zilog
->zl_lock
);
1329 if (zilog
->zl_suspend
++ != 0) {
1331 * Someone else already began a suspend.
1332 * Just wait for them to finish.
1334 while (zilog
->zl_suspending
)
1335 cv_wait(&zilog
->zl_cv_suspend
, &zilog
->zl_lock
);
1336 ASSERT(BP_IS_HOLE(&zh
->zh_log
));
1337 mutex_exit(&zilog
->zl_lock
);
1340 zilog
->zl_suspending
= B_TRUE
;
1341 mutex_exit(&zilog
->zl_lock
);
1343 zil_commit(zilog
, UINT64_MAX
, 0);
1346 * Wait for any in-flight log writes to complete.
1348 mutex_enter(&zilog
->zl_lock
);
1349 while (zilog
->zl_writer
)
1350 cv_wait(&zilog
->zl_cv_writer
, &zilog
->zl_lock
);
1351 mutex_exit(&zilog
->zl_lock
);
1353 zil_destroy(zilog
, B_FALSE
);
1355 mutex_enter(&zilog
->zl_lock
);
1356 zilog
->zl_suspending
= B_FALSE
;
1357 cv_broadcast(&zilog
->zl_cv_suspend
);
1358 mutex_exit(&zilog
->zl_lock
);
1364 zil_resume(zilog_t
*zilog
)
1366 mutex_enter(&zilog
->zl_lock
);
1367 ASSERT(zilog
->zl_suspend
!= 0);
1368 zilog
->zl_suspend
--;
1369 mutex_exit(&zilog
->zl_lock
);
1372 typedef struct zil_replay_arg
{
1374 zil_replay_func_t
**zr_replay
;
1377 boolean_t zr_byteswap
;
1382 zil_replay_log_record(zilog_t
*zilog
, lr_t
*lr
, void *zra
, uint64_t claim_txg
)
1384 zil_replay_arg_t
*zr
= zra
;
1385 const zil_header_t
*zh
= zilog
->zl_header
;
1386 uint64_t reclen
= lr
->lrc_reclen
;
1387 uint64_t txtype
= lr
->lrc_txtype
;
1389 int pass
, error
, sunk
;
1391 if (zilog
->zl_stop_replay
)
1394 if (lr
->lrc_txg
< claim_txg
) /* already committed */
1397 if (lr
->lrc_seq
<= zh
->zh_replay_seq
) /* already replayed */
1400 /* Strip case-insensitive bit, still present in log record */
1404 * Make a copy of the data so we can revise and extend it.
1406 bcopy(lr
, zr
->zr_lrbuf
, reclen
);
1409 * The log block containing this lr may have been byteswapped
1410 * so that we can easily examine common fields like lrc_txtype.
1411 * However, the log is a mix of different data types, and only the
1412 * replay vectors know how to byteswap their records. Therefore, if
1413 * the lr was byteswapped, undo it before invoking the replay vector.
1415 if (zr
->zr_byteswap
)
1416 byteswap_uint64_array(zr
->zr_lrbuf
, reclen
);
1419 * If this is a TX_WRITE with a blkptr, suck in the data.
1421 if (txtype
== TX_WRITE
&& reclen
== sizeof (lr_write_t
)) {
1422 lr_write_t
*lrw
= (lr_write_t
*)lr
;
1423 blkptr_t
*wbp
= &lrw
->lr_blkptr
;
1424 uint64_t wlen
= lrw
->lr_length
;
1425 char *wbuf
= zr
->zr_lrbuf
+ reclen
;
1427 if (BP_IS_HOLE(wbp
)) { /* compressed to a hole */
1431 * A subsequent write may have overwritten this block,
1432 * in which case wbp may have been been freed and
1433 * reallocated, and our read of wbp may fail with a
1434 * checksum error. We can safely ignore this because
1435 * the later write will provide the correct data.
1439 zb
.zb_objset
= dmu_objset_id(zilog
->zl_os
);
1440 zb
.zb_object
= lrw
->lr_foid
;
1442 zb
.zb_blkid
= lrw
->lr_offset
/ BP_GET_LSIZE(wbp
);
1444 (void) zio_wait(zio_read(NULL
, zilog
->zl_spa
,
1445 wbp
, wbuf
, BP_GET_LSIZE(wbp
), NULL
, NULL
,
1446 ZIO_PRIORITY_SYNC_READ
,
1447 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
, &zb
));
1448 (void) memmove(wbuf
, wbuf
+ lrw
->lr_blkoff
, wlen
);
1453 * We must now do two things atomically: replay this log record,
1454 * and update the log header to reflect the fact that we did so.
1455 * We use the DMU's ability to assign into a specific txg to do this.
1457 for (pass
= 1, sunk
= B_FALSE
; /* CONSTANTCONDITION */; pass
++) {
1458 uint64_t replay_txg
;
1459 dmu_tx_t
*replay_tx
;
1461 replay_tx
= dmu_tx_create(zr
->zr_os
);
1462 error
= dmu_tx_assign(replay_tx
, TXG_WAIT
);
1464 dmu_tx_abort(replay_tx
);
1468 replay_txg
= dmu_tx_get_txg(replay_tx
);
1470 if (txtype
== 0 || txtype
>= TX_MAX_TYPE
) {
1474 * On the first pass, arrange for the replay vector
1475 * to fail its dmu_tx_assign(). That's the only way
1476 * to ensure that those code paths remain well tested.
1478 * Only byteswap (if needed) on the 1st pass.
1480 *zr
->zr_txgp
= replay_txg
- (pass
== 1);
1481 error
= zr
->zr_replay
[txtype
](zr
->zr_arg
, zr
->zr_lrbuf
,
1482 zr
->zr_byteswap
&& pass
== 1);
1483 *zr
->zr_txgp
= TXG_NOWAIT
;
1487 dsl_dataset_dirty(dmu_objset_ds(zr
->zr_os
), replay_tx
);
1488 zilog
->zl_replay_seq
[replay_txg
& TXG_MASK
] =
1492 dmu_tx_commit(replay_tx
);
1498 * The DMU's dnode layer doesn't see removes until the txg
1499 * commits, so a subsequent claim can spuriously fail with
1500 * EEXIST. So if we receive any error other than ERESTART
1501 * we try syncing out any removes then retrying the
1504 if (error
!= ERESTART
&& !sunk
) {
1505 txg_wait_synced(spa_get_dsl(zilog
->zl_spa
), 0);
1507 continue; /* retry */
1510 if (error
!= ERESTART
)
1514 txg_wait_open(spa_get_dsl(zilog
->zl_spa
),
1517 dprintf("pass %d, retrying\n", pass
);
1520 ASSERT(error
&& error
!= ERESTART
);
1521 name
= kmem_alloc(MAXNAMELEN
, KM_SLEEP
);
1522 dmu_objset_name(zr
->zr_os
, name
);
1523 cmn_err(CE_WARN
, "ZFS replay transaction error %d, "
1524 "dataset %s, seq 0x%llx, txtype %llu %s\n",
1525 error
, name
, (u_longlong_t
)lr
->lrc_seq
, (u_longlong_t
)txtype
,
1526 (lr
->lrc_txtype
& TX_CI
) ? "CI" : "");
1527 zilog
->zl_stop_replay
= 1;
1528 kmem_free(name
, MAXNAMELEN
);
1533 zil_incr_blks(zilog_t
*zilog
, blkptr_t
*bp
, void *arg
, uint64_t claim_txg
)
1535 zilog
->zl_replay_blks
++;
1539 * If this dataset has a non-empty intent log, replay it and destroy it.
1542 zil_replay(objset_t
*os
, void *arg
, uint64_t *txgp
,
1543 zil_replay_func_t
*replay_func
[TX_MAX_TYPE
])
1545 zilog_t
*zilog
= dmu_objset_zil(os
);
1546 const zil_header_t
*zh
= zilog
->zl_header
;
1547 zil_replay_arg_t zr
;
1549 if (zil_empty(zilog
)) {
1550 zil_destroy(zilog
, B_TRUE
);
1555 zr
.zr_replay
= replay_func
;
1558 zr
.zr_byteswap
= BP_SHOULD_BYTESWAP(&zh
->zh_log
);
1559 zr
.zr_lrbuf
= kmem_alloc(2 * SPA_MAXBLOCKSIZE
, KM_SLEEP
);
1562 * Wait for in-progress removes to sync before starting replay.
1564 txg_wait_synced(zilog
->zl_dmu_pool
, 0);
1566 zilog
->zl_stop_replay
= 0;
1567 zilog
->zl_replay_time
= lbolt
;
1568 ASSERT(zilog
->zl_replay_blks
== 0);
1569 (void) zil_parse(zilog
, zil_incr_blks
, zil_replay_log_record
, &zr
,
1571 kmem_free(zr
.zr_lrbuf
, 2 * SPA_MAXBLOCKSIZE
);
1573 zil_destroy(zilog
, B_FALSE
);
1574 txg_wait_synced(zilog
->zl_dmu_pool
, zilog
->zl_destroy_txg
);
1578 * Report whether all transactions are committed
1581 zil_is_committed(zilog_t
*zilog
)
1586 mutex_enter(&zilog
->zl_lock
);
1587 while (zilog
->zl_writer
)
1588 cv_wait(&zilog
->zl_cv_writer
, &zilog
->zl_lock
);
1590 /* recent unpushed intent log transactions? */
1591 if (!list_is_empty(&zilog
->zl_itx_list
)) {
1596 /* intent log never used? */
1597 lwb
= list_head(&zilog
->zl_lwb_list
);
1604 * more than 1 log buffer means zil_sync() hasn't yet freed
1605 * entries after a txg has committed
1607 if (list_next(&zilog
->zl_lwb_list
, lwb
)) {
1612 ASSERT(zil_empty(zilog
));
1615 cv_broadcast(&zilog
->zl_cv_writer
);
1616 mutex_exit(&zilog
->zl_lock
);