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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
26 /* Portions Copyright 2010 Robert Milkowski */
28 #include <sys/zfs_context.h>
34 #include <sys/resource.h>
36 #include <sys/zil_impl.h>
37 #include <sys/dsl_dataset.h>
38 #include <sys/vdev_impl.h>
39 #include <sys/dmu_tx.h>
40 #include <sys/dsl_pool.h>
41 #include <sys/metaslab.h>
42 #include <sys/trace_zil.h>
46 * The zfs intent log (ZIL) saves transaction records of system calls
47 * that change the file system in memory with enough information
48 * to be able to replay them. These are stored in memory until
49 * either the DMU transaction group (txg) commits them to the stable pool
50 * and they can be discarded, or they are flushed to the stable log
51 * (also in the pool) due to a fsync, O_DSYNC or other synchronous
52 * requirement. In the event of a panic or power fail then those log
53 * records (transactions) are replayed.
55 * There is one ZIL per file system. Its on-disk (pool) format consists
62 * A log record holds a system call transaction. Log blocks can
63 * hold many log records and the blocks are chained together.
64 * Each ZIL block contains a block pointer (blkptr_t) to the next
65 * ZIL block in the chain. The ZIL header points to the first
66 * block in the chain. Note there is not a fixed place in the pool
67 * to hold blocks. They are dynamically allocated and freed as
68 * needed from the blocks available. Figure X shows the ZIL structure:
72 * See zil.h for more information about these fields.
74 zil_stats_t zil_stats = {
75 { "zil_commit_count", KSTAT_DATA_UINT64 },
76 { "zil_commit_writer_count", KSTAT_DATA_UINT64 },
77 { "zil_itx_count", KSTAT_DATA_UINT64 },
78 { "zil_itx_indirect_count", KSTAT_DATA_UINT64 },
79 { "zil_itx_indirect_bytes", KSTAT_DATA_UINT64 },
80 { "zil_itx_copied_count", KSTAT_DATA_UINT64 },
81 { "zil_itx_copied_bytes", KSTAT_DATA_UINT64 },
82 { "zil_itx_needcopy_count", KSTAT_DATA_UINT64 },
83 { "zil_itx_needcopy_bytes", KSTAT_DATA_UINT64 },
84 { "zil_itx_metaslab_normal_count", KSTAT_DATA_UINT64 },
85 { "zil_itx_metaslab_normal_bytes", KSTAT_DATA_UINT64 },
86 { "zil_itx_metaslab_slog_count", KSTAT_DATA_UINT64 },
87 { "zil_itx_metaslab_slog_bytes", KSTAT_DATA_UINT64 },
90 static kstat_t *zil_ksp;
93 * Disable intent logging replay. This global ZIL switch affects all pools.
95 int zil_replay_disable = 0;
98 * Tunable parameter for debugging or performance analysis. Setting
99 * zfs_nocacheflush will cause corruption on power loss if a volatile
100 * out-of-order write cache is enabled.
102 int zfs_nocacheflush = 0;
104 static kmem_cache_t *zil_lwb_cache;
106 static void zil_async_to_sync(zilog_t *zilog, uint64_t foid);
108 #define LWB_EMPTY(lwb) ((BP_GET_LSIZE(&lwb->lwb_blk) - \
109 sizeof (zil_chain_t)) == (lwb->lwb_sz - lwb->lwb_nused))
113 * ziltest is by and large an ugly hack, but very useful in
114 * checking replay without tedious work.
115 * When running ziltest we want to keep all itx's and so maintain
116 * a single list in the zl_itxg[] that uses a high txg: ZILTEST_TXG
117 * We subtract TXG_CONCURRENT_STATES to allow for common code.
119 #define ZILTEST_TXG (UINT64_MAX - TXG_CONCURRENT_STATES)
122 zil_bp_compare(const void *x1, const void *x2)
124 const dva_t *dva1 = &((zil_bp_node_t *)x1)->zn_dva;
125 const dva_t *dva2 = &((zil_bp_node_t *)x2)->zn_dva;
127 int cmp = AVL_CMP(DVA_GET_VDEV(dva1), DVA_GET_VDEV(dva2));
131 return (AVL_CMP(DVA_GET_OFFSET(dva1), DVA_GET_OFFSET(dva2)));
135 zil_bp_tree_init(zilog_t *zilog)
137 avl_create(&zilog->zl_bp_tree, zil_bp_compare,
138 sizeof (zil_bp_node_t), offsetof(zil_bp_node_t, zn_node));
142 zil_bp_tree_fini(zilog_t *zilog)
144 avl_tree_t *t = &zilog->zl_bp_tree;
148 while ((zn = avl_destroy_nodes(t, &cookie)) != NULL)
149 kmem_free(zn, sizeof (zil_bp_node_t));
155 zil_bp_tree_add(zilog_t *zilog, const blkptr_t *bp)
157 avl_tree_t *t = &zilog->zl_bp_tree;
162 if (BP_IS_EMBEDDED(bp))
165 dva = BP_IDENTITY(bp);
167 if (avl_find(t, dva, &where) != NULL)
168 return (SET_ERROR(EEXIST));
170 zn = kmem_alloc(sizeof (zil_bp_node_t), KM_SLEEP);
172 avl_insert(t, zn, where);
177 static zil_header_t *
178 zil_header_in_syncing_context(zilog_t *zilog)
180 return ((zil_header_t *)zilog->zl_header);
184 zil_init_log_chain(zilog_t *zilog, blkptr_t *bp)
186 zio_cksum_t *zc = &bp->blk_cksum;
188 zc->zc_word[ZIL_ZC_GUID_0] = spa_get_random(-1ULL);
189 zc->zc_word[ZIL_ZC_GUID_1] = spa_get_random(-1ULL);
190 zc->zc_word[ZIL_ZC_OBJSET] = dmu_objset_id(zilog->zl_os);
191 zc->zc_word[ZIL_ZC_SEQ] = 1ULL;
195 * Read a log block and make sure it's valid.
198 zil_read_log_block(zilog_t *zilog, const blkptr_t *bp, blkptr_t *nbp, void *dst,
201 enum zio_flag zio_flags = ZIO_FLAG_CANFAIL;
202 arc_flags_t aflags = ARC_FLAG_WAIT;
203 arc_buf_t *abuf = NULL;
207 if (zilog->zl_header->zh_claim_txg == 0)
208 zio_flags |= ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB;
210 if (!(zilog->zl_header->zh_flags & ZIL_CLAIM_LR_SEQ_VALID))
211 zio_flags |= ZIO_FLAG_SPECULATIVE;
213 SET_BOOKMARK(&zb, bp->blk_cksum.zc_word[ZIL_ZC_OBJSET],
214 ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, bp->blk_cksum.zc_word[ZIL_ZC_SEQ]);
216 error = arc_read(NULL, zilog->zl_spa, bp, arc_getbuf_func, &abuf,
217 ZIO_PRIORITY_SYNC_READ, zio_flags, &aflags, &zb);
220 zio_cksum_t cksum = bp->blk_cksum;
223 * Validate the checksummed log block.
225 * Sequence numbers should be... sequential. The checksum
226 * verifier for the next block should be bp's checksum plus 1.
228 * Also check the log chain linkage and size used.
230 cksum.zc_word[ZIL_ZC_SEQ]++;
232 if (BP_GET_CHECKSUM(bp) == ZIO_CHECKSUM_ZILOG2) {
233 zil_chain_t *zilc = abuf->b_data;
234 char *lr = (char *)(zilc + 1);
235 uint64_t len = zilc->zc_nused - sizeof (zil_chain_t);
237 if (bcmp(&cksum, &zilc->zc_next_blk.blk_cksum,
238 sizeof (cksum)) || BP_IS_HOLE(&zilc->zc_next_blk)) {
239 error = SET_ERROR(ECKSUM);
241 ASSERT3U(len, <=, SPA_OLD_MAXBLOCKSIZE);
243 *end = (char *)dst + len;
244 *nbp = zilc->zc_next_blk;
247 char *lr = abuf->b_data;
248 uint64_t size = BP_GET_LSIZE(bp);
249 zil_chain_t *zilc = (zil_chain_t *)(lr + size) - 1;
251 if (bcmp(&cksum, &zilc->zc_next_blk.blk_cksum,
252 sizeof (cksum)) || BP_IS_HOLE(&zilc->zc_next_blk) ||
253 (zilc->zc_nused > (size - sizeof (*zilc)))) {
254 error = SET_ERROR(ECKSUM);
256 ASSERT3U(zilc->zc_nused, <=,
257 SPA_OLD_MAXBLOCKSIZE);
258 bcopy(lr, dst, zilc->zc_nused);
259 *end = (char *)dst + zilc->zc_nused;
260 *nbp = zilc->zc_next_blk;
264 arc_buf_destroy(abuf, &abuf);
271 * Read a TX_WRITE log data block.
274 zil_read_log_data(zilog_t *zilog, const lr_write_t *lr, void *wbuf)
276 enum zio_flag zio_flags = ZIO_FLAG_CANFAIL;
277 const blkptr_t *bp = &lr->lr_blkptr;
278 arc_flags_t aflags = ARC_FLAG_WAIT;
279 arc_buf_t *abuf = NULL;
283 if (BP_IS_HOLE(bp)) {
285 bzero(wbuf, MAX(BP_GET_LSIZE(bp), lr->lr_length));
289 if (zilog->zl_header->zh_claim_txg == 0)
290 zio_flags |= ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB;
292 SET_BOOKMARK(&zb, dmu_objset_id(zilog->zl_os), lr->lr_foid,
293 ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp));
295 error = arc_read(NULL, zilog->zl_spa, bp, arc_getbuf_func, &abuf,
296 ZIO_PRIORITY_SYNC_READ, zio_flags, &aflags, &zb);
300 bcopy(abuf->b_data, wbuf, arc_buf_size(abuf));
301 arc_buf_destroy(abuf, &abuf);
308 * Parse the intent log, and call parse_func for each valid record within.
311 zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func,
312 zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg)
314 const zil_header_t *zh = zilog->zl_header;
315 boolean_t claimed = !!zh->zh_claim_txg;
316 uint64_t claim_blk_seq = claimed ? zh->zh_claim_blk_seq : UINT64_MAX;
317 uint64_t claim_lr_seq = claimed ? zh->zh_claim_lr_seq : UINT64_MAX;
318 uint64_t max_blk_seq = 0;
319 uint64_t max_lr_seq = 0;
320 uint64_t blk_count = 0;
321 uint64_t lr_count = 0;
322 blkptr_t blk, next_blk;
326 bzero(&next_blk, sizeof (blkptr_t));
329 * Old logs didn't record the maximum zh_claim_lr_seq.
331 if (!(zh->zh_flags & ZIL_CLAIM_LR_SEQ_VALID))
332 claim_lr_seq = UINT64_MAX;
335 * Starting at the block pointed to by zh_log we read the log chain.
336 * For each block in the chain we strongly check that block to
337 * ensure its validity. We stop when an invalid block is found.
338 * For each block pointer in the chain we call parse_blk_func().
339 * For each record in each valid block we call parse_lr_func().
340 * If the log has been claimed, stop if we encounter a sequence
341 * number greater than the highest claimed sequence number.
343 lrbuf = zio_buf_alloc(SPA_OLD_MAXBLOCKSIZE);
344 zil_bp_tree_init(zilog);
346 for (blk = zh->zh_log; !BP_IS_HOLE(&blk); blk = next_blk) {
347 uint64_t blk_seq = blk.blk_cksum.zc_word[ZIL_ZC_SEQ];
351 if (blk_seq > claim_blk_seq)
353 if ((error = parse_blk_func(zilog, &blk, arg, txg)) != 0)
355 ASSERT3U(max_blk_seq, <, blk_seq);
356 max_blk_seq = blk_seq;
359 if (max_lr_seq == claim_lr_seq && max_blk_seq == claim_blk_seq)
362 error = zil_read_log_block(zilog, &blk, &next_blk, lrbuf, &end);
366 for (lrp = lrbuf; lrp < end; lrp += reclen) {
367 lr_t *lr = (lr_t *)lrp;
368 reclen = lr->lrc_reclen;
369 ASSERT3U(reclen, >=, sizeof (lr_t));
370 if (lr->lrc_seq > claim_lr_seq)
372 if ((error = parse_lr_func(zilog, lr, arg, txg)) != 0)
374 ASSERT3U(max_lr_seq, <, lr->lrc_seq);
375 max_lr_seq = lr->lrc_seq;
380 zilog->zl_parse_error = error;
381 zilog->zl_parse_blk_seq = max_blk_seq;
382 zilog->zl_parse_lr_seq = max_lr_seq;
383 zilog->zl_parse_blk_count = blk_count;
384 zilog->zl_parse_lr_count = lr_count;
386 ASSERT(!claimed || !(zh->zh_flags & ZIL_CLAIM_LR_SEQ_VALID) ||
387 (max_blk_seq == claim_blk_seq && max_lr_seq == claim_lr_seq));
389 zil_bp_tree_fini(zilog);
390 zio_buf_free(lrbuf, SPA_OLD_MAXBLOCKSIZE);
396 zil_claim_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t first_txg)
399 * Claim log block if not already committed and not already claimed.
400 * If tx == NULL, just verify that the block is claimable.
402 if (BP_IS_HOLE(bp) || bp->blk_birth < first_txg ||
403 zil_bp_tree_add(zilog, bp) != 0)
406 return (zio_wait(zio_claim(NULL, zilog->zl_spa,
407 tx == NULL ? 0 : first_txg, bp, spa_claim_notify, NULL,
408 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB)));
412 zil_claim_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t first_txg)
414 lr_write_t *lr = (lr_write_t *)lrc;
417 if (lrc->lrc_txtype != TX_WRITE)
421 * If the block is not readable, don't claim it. This can happen
422 * in normal operation when a log block is written to disk before
423 * some of the dmu_sync() blocks it points to. In this case, the
424 * transaction cannot have been committed to anyone (we would have
425 * waited for all writes to be stable first), so it is semantically
426 * correct to declare this the end of the log.
428 if (lr->lr_blkptr.blk_birth >= first_txg &&
429 (error = zil_read_log_data(zilog, lr, NULL)) != 0)
431 return (zil_claim_log_block(zilog, &lr->lr_blkptr, tx, first_txg));
436 zil_free_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t claim_txg)
438 zio_free_zil(zilog->zl_spa, dmu_tx_get_txg(tx), bp);
444 zil_free_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t claim_txg)
446 lr_write_t *lr = (lr_write_t *)lrc;
447 blkptr_t *bp = &lr->lr_blkptr;
450 * If we previously claimed it, we need to free it.
452 if (claim_txg != 0 && lrc->lrc_txtype == TX_WRITE &&
453 bp->blk_birth >= claim_txg && zil_bp_tree_add(zilog, bp) == 0 &&
455 zio_free(zilog->zl_spa, dmu_tx_get_txg(tx), bp);
461 zil_alloc_lwb(zilog_t *zilog, blkptr_t *bp, uint64_t txg, boolean_t fastwrite)
465 lwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP);
466 lwb->lwb_zilog = zilog;
468 lwb->lwb_fastwrite = fastwrite;
469 lwb->lwb_buf = zio_buf_alloc(BP_GET_LSIZE(bp));
470 lwb->lwb_max_txg = txg;
473 if (BP_GET_CHECKSUM(bp) == ZIO_CHECKSUM_ZILOG2) {
474 lwb->lwb_nused = sizeof (zil_chain_t);
475 lwb->lwb_sz = BP_GET_LSIZE(bp);
478 lwb->lwb_sz = BP_GET_LSIZE(bp) - sizeof (zil_chain_t);
481 mutex_enter(&zilog->zl_lock);
482 list_insert_tail(&zilog->zl_lwb_list, lwb);
483 mutex_exit(&zilog->zl_lock);
489 * Called when we create in-memory log transactions so that we know
490 * to cleanup the itxs at the end of spa_sync().
493 zilog_dirty(zilog_t *zilog, uint64_t txg)
495 dsl_pool_t *dp = zilog->zl_dmu_pool;
496 dsl_dataset_t *ds = dmu_objset_ds(zilog->zl_os);
498 if (ds->ds_is_snapshot)
499 panic("dirtying snapshot!");
501 if (txg_list_add(&dp->dp_dirty_zilogs, zilog, txg)) {
502 /* up the hold count until we can be written out */
503 dmu_buf_add_ref(ds->ds_dbuf, zilog);
508 zilog_is_dirty(zilog_t *zilog)
510 dsl_pool_t *dp = zilog->zl_dmu_pool;
513 for (t = 0; t < TXG_SIZE; t++) {
514 if (txg_list_member(&dp->dp_dirty_zilogs, zilog, t))
521 * Create an on-disk intent log.
524 zil_create(zilog_t *zilog)
526 const zil_header_t *zh = zilog->zl_header;
532 boolean_t fastwrite = FALSE;
535 * Wait for any previous destroy to complete.
537 txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg);
539 ASSERT(zh->zh_claim_txg == 0);
540 ASSERT(zh->zh_replay_seq == 0);
545 * Allocate an initial log block if:
546 * - there isn't one already
547 * - the existing block is the wrong endianness
549 if (BP_IS_HOLE(&blk) || BP_SHOULD_BYTESWAP(&blk)) {
550 tx = dmu_tx_create(zilog->zl_os);
551 VERIFY(dmu_tx_assign(tx, TXG_WAIT) == 0);
552 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
553 txg = dmu_tx_get_txg(tx);
555 if (!BP_IS_HOLE(&blk)) {
556 zio_free_zil(zilog->zl_spa, txg, &blk);
560 error = zio_alloc_zil(zilog->zl_spa, txg, &blk,
561 ZIL_MIN_BLKSZ, B_TRUE);
565 zil_init_log_chain(zilog, &blk);
569 * Allocate a log write buffer (lwb) for the first log block.
572 lwb = zil_alloc_lwb(zilog, &blk, txg, fastwrite);
575 * If we just allocated the first log block, commit our transaction
576 * and wait for zil_sync() to stuff the block poiner into zh_log.
577 * (zh is part of the MOS, so we cannot modify it in open context.)
581 txg_wait_synced(zilog->zl_dmu_pool, txg);
584 ASSERT(bcmp(&blk, &zh->zh_log, sizeof (blk)) == 0);
590 * In one tx, free all log blocks and clear the log header.
591 * If keep_first is set, then we're replaying a log with no content.
592 * We want to keep the first block, however, so that the first
593 * synchronous transaction doesn't require a txg_wait_synced()
594 * in zil_create(). We don't need to txg_wait_synced() here either
595 * when keep_first is set, because both zil_create() and zil_destroy()
596 * will wait for any in-progress destroys to complete.
599 zil_destroy(zilog_t *zilog, boolean_t keep_first)
601 const zil_header_t *zh = zilog->zl_header;
607 * Wait for any previous destroy to complete.
609 txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg);
611 zilog->zl_old_header = *zh; /* debugging aid */
613 if (BP_IS_HOLE(&zh->zh_log))
616 tx = dmu_tx_create(zilog->zl_os);
617 VERIFY(dmu_tx_assign(tx, TXG_WAIT) == 0);
618 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
619 txg = dmu_tx_get_txg(tx);
621 mutex_enter(&zilog->zl_lock);
623 ASSERT3U(zilog->zl_destroy_txg, <, txg);
624 zilog->zl_destroy_txg = txg;
625 zilog->zl_keep_first = keep_first;
627 if (!list_is_empty(&zilog->zl_lwb_list)) {
628 ASSERT(zh->zh_claim_txg == 0);
630 while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) {
631 ASSERT(lwb->lwb_zio == NULL);
632 if (lwb->lwb_fastwrite)
633 metaslab_fastwrite_unmark(zilog->zl_spa,
635 list_remove(&zilog->zl_lwb_list, lwb);
636 if (lwb->lwb_buf != NULL)
637 zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);
638 zio_free_zil(zilog->zl_spa, txg, &lwb->lwb_blk);
639 kmem_cache_free(zil_lwb_cache, lwb);
641 } else if (!keep_first) {
642 zil_destroy_sync(zilog, tx);
644 mutex_exit(&zilog->zl_lock);
650 zil_destroy_sync(zilog_t *zilog, dmu_tx_t *tx)
652 ASSERT(list_is_empty(&zilog->zl_lwb_list));
653 (void) zil_parse(zilog, zil_free_log_block,
654 zil_free_log_record, tx, zilog->zl_header->zh_claim_txg);
658 zil_claim(dsl_pool_t *dp, dsl_dataset_t *ds, void *txarg)
660 dmu_tx_t *tx = txarg;
661 uint64_t first_txg = dmu_tx_get_txg(tx);
667 error = dmu_objset_own_obj(dp, ds->ds_object,
668 DMU_OST_ANY, B_FALSE, FTAG, &os);
671 * EBUSY indicates that the objset is inconsistent, in which
672 * case it can not have a ZIL.
674 if (error != EBUSY) {
675 cmn_err(CE_WARN, "can't open objset for %llu, error %u",
676 (unsigned long long)ds->ds_object, error);
682 zilog = dmu_objset_zil(os);
683 zh = zil_header_in_syncing_context(zilog);
685 if (spa_get_log_state(zilog->zl_spa) == SPA_LOG_CLEAR) {
686 if (!BP_IS_HOLE(&zh->zh_log))
687 zio_free_zil(zilog->zl_spa, first_txg, &zh->zh_log);
688 BP_ZERO(&zh->zh_log);
689 dsl_dataset_dirty(dmu_objset_ds(os), tx);
690 dmu_objset_disown(os, FTAG);
695 * Claim all log blocks if we haven't already done so, and remember
696 * the highest claimed sequence number. This ensures that if we can
697 * read only part of the log now (e.g. due to a missing device),
698 * but we can read the entire log later, we will not try to replay
699 * or destroy beyond the last block we successfully claimed.
701 ASSERT3U(zh->zh_claim_txg, <=, first_txg);
702 if (zh->zh_claim_txg == 0 && !BP_IS_HOLE(&zh->zh_log)) {
703 (void) zil_parse(zilog, zil_claim_log_block,
704 zil_claim_log_record, tx, first_txg);
705 zh->zh_claim_txg = first_txg;
706 zh->zh_claim_blk_seq = zilog->zl_parse_blk_seq;
707 zh->zh_claim_lr_seq = zilog->zl_parse_lr_seq;
708 if (zilog->zl_parse_lr_count || zilog->zl_parse_blk_count > 1)
709 zh->zh_flags |= ZIL_REPLAY_NEEDED;
710 zh->zh_flags |= ZIL_CLAIM_LR_SEQ_VALID;
711 dsl_dataset_dirty(dmu_objset_ds(os), tx);
714 ASSERT3U(first_txg, ==, (spa_last_synced_txg(zilog->zl_spa) + 1));
715 dmu_objset_disown(os, FTAG);
720 * Check the log by walking the log chain.
721 * Checksum errors are ok as they indicate the end of the chain.
722 * Any other error (no device or read failure) returns an error.
726 zil_check_log_chain(dsl_pool_t *dp, dsl_dataset_t *ds, void *tx)
735 error = dmu_objset_from_ds(ds, &os);
737 cmn_err(CE_WARN, "can't open objset %llu, error %d",
738 (unsigned long long)ds->ds_object, error);
742 zilog = dmu_objset_zil(os);
743 bp = (blkptr_t *)&zilog->zl_header->zh_log;
746 * Check the first block and determine if it's on a log device
747 * which may have been removed or faulted prior to loading this
748 * pool. If so, there's no point in checking the rest of the log
749 * as its content should have already been synced to the pool.
751 if (!BP_IS_HOLE(bp)) {
753 boolean_t valid = B_TRUE;
755 spa_config_enter(os->os_spa, SCL_STATE, FTAG, RW_READER);
756 vd = vdev_lookup_top(os->os_spa, DVA_GET_VDEV(&bp->blk_dva[0]));
757 if (vd->vdev_islog && vdev_is_dead(vd))
758 valid = vdev_log_state_valid(vd);
759 spa_config_exit(os->os_spa, SCL_STATE, FTAG);
766 * Because tx == NULL, zil_claim_log_block() will not actually claim
767 * any blocks, but just determine whether it is possible to do so.
768 * In addition to checking the log chain, zil_claim_log_block()
769 * will invoke zio_claim() with a done func of spa_claim_notify(),
770 * which will update spa_max_claim_txg. See spa_load() for details.
772 error = zil_parse(zilog, zil_claim_log_block, zil_claim_log_record, tx,
773 zilog->zl_header->zh_claim_txg ? -1ULL : spa_first_txg(os->os_spa));
775 return ((error == ECKSUM || error == ENOENT) ? 0 : error);
779 zil_vdev_compare(const void *x1, const void *x2)
781 const uint64_t v1 = ((zil_vdev_node_t *)x1)->zv_vdev;
782 const uint64_t v2 = ((zil_vdev_node_t *)x2)->zv_vdev;
784 return (AVL_CMP(v1, v2));
788 zil_add_block(zilog_t *zilog, const blkptr_t *bp)
790 avl_tree_t *t = &zilog->zl_vdev_tree;
792 zil_vdev_node_t *zv, zvsearch;
793 int ndvas = BP_GET_NDVAS(bp);
796 if (zfs_nocacheflush)
799 ASSERT(zilog->zl_writer);
802 * Even though we're zl_writer, we still need a lock because the
803 * zl_get_data() callbacks may have dmu_sync() done callbacks
804 * that will run concurrently.
806 mutex_enter(&zilog->zl_vdev_lock);
807 for (i = 0; i < ndvas; i++) {
808 zvsearch.zv_vdev = DVA_GET_VDEV(&bp->blk_dva[i]);
809 if (avl_find(t, &zvsearch, &where) == NULL) {
810 zv = kmem_alloc(sizeof (*zv), KM_SLEEP);
811 zv->zv_vdev = zvsearch.zv_vdev;
812 avl_insert(t, zv, where);
815 mutex_exit(&zilog->zl_vdev_lock);
819 zil_flush_vdevs(zilog_t *zilog)
821 spa_t *spa = zilog->zl_spa;
822 avl_tree_t *t = &zilog->zl_vdev_tree;
827 ASSERT(zilog->zl_writer);
830 * We don't need zl_vdev_lock here because we're the zl_writer,
831 * and all zl_get_data() callbacks are done.
833 if (avl_numnodes(t) == 0)
836 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
838 zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL);
840 while ((zv = avl_destroy_nodes(t, &cookie)) != NULL) {
841 vdev_t *vd = vdev_lookup_top(spa, zv->zv_vdev);
844 kmem_free(zv, sizeof (*zv));
848 * Wait for all the flushes to complete. Not all devices actually
849 * support the DKIOCFLUSHWRITECACHE ioctl, so it's OK if it fails.
851 (void) zio_wait(zio);
853 spa_config_exit(spa, SCL_STATE, FTAG);
857 * Function called when a log block write completes
860 zil_lwb_write_done(zio_t *zio)
862 lwb_t *lwb = zio->io_private;
863 zilog_t *zilog = lwb->lwb_zilog;
864 dmu_tx_t *tx = lwb->lwb_tx;
866 ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF);
867 ASSERT(BP_GET_TYPE(zio->io_bp) == DMU_OT_INTENT_LOG);
868 ASSERT(BP_GET_LEVEL(zio->io_bp) == 0);
869 ASSERT(BP_GET_BYTEORDER(zio->io_bp) == ZFS_HOST_BYTEORDER);
870 ASSERT(!BP_IS_GANG(zio->io_bp));
871 ASSERT(!BP_IS_HOLE(zio->io_bp));
872 ASSERT(BP_GET_FILL(zio->io_bp) == 0);
875 * Ensure the lwb buffer pointer is cleared before releasing
876 * the txg. If we have had an allocation failure and
877 * the txg is waiting to sync then we want want zil_sync()
878 * to remove the lwb so that it's not picked up as the next new
879 * one in zil_commit_writer(). zil_sync() will only remove
880 * the lwb if lwb_buf is null.
882 abd_put(zio->io_abd);
883 zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);
884 mutex_enter(&zilog->zl_lock);
886 lwb->lwb_fastwrite = FALSE;
889 mutex_exit(&zilog->zl_lock);
892 * Now that we've written this log block, we have a stable pointer
893 * to the next block in the chain, so it's OK to let the txg in
894 * which we allocated the next block sync.
900 * Initialize the io for a log block.
903 zil_lwb_write_init(zilog_t *zilog, lwb_t *lwb)
907 SET_BOOKMARK(&zb, lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_OBJSET],
908 ZB_ZIL_OBJECT, ZB_ZIL_LEVEL,
909 lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_SEQ]);
911 if (zilog->zl_root_zio == NULL) {
912 zilog->zl_root_zio = zio_root(zilog->zl_spa, NULL, NULL,
916 /* Lock so zil_sync() doesn't fastwrite_unmark after zio is created */
917 mutex_enter(&zilog->zl_lock);
918 if (lwb->lwb_zio == NULL) {
919 abd_t *lwb_abd = abd_get_from_buf(lwb->lwb_buf,
920 BP_GET_LSIZE(&lwb->lwb_blk));
921 if (!lwb->lwb_fastwrite) {
922 metaslab_fastwrite_mark(zilog->zl_spa, &lwb->lwb_blk);
923 lwb->lwb_fastwrite = 1;
925 lwb->lwb_zio = zio_rewrite(zilog->zl_root_zio, zilog->zl_spa,
926 0, &lwb->lwb_blk, lwb_abd, BP_GET_LSIZE(&lwb->lwb_blk),
927 zil_lwb_write_done, lwb, ZIO_PRIORITY_SYNC_WRITE,
928 ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE |
929 ZIO_FLAG_FASTWRITE, &zb);
931 mutex_exit(&zilog->zl_lock);
935 * Define a limited set of intent log block sizes.
937 * These must be a multiple of 4KB. Note only the amount used (again
938 * aligned to 4KB) actually gets written. However, we can't always just
939 * allocate SPA_OLD_MAXBLOCKSIZE as the slog space could be exhausted.
941 uint64_t zil_block_buckets[] = {
942 4096, /* non TX_WRITE */
943 8192+4096, /* data base */
944 32*1024 + 4096, /* NFS writes */
949 * Use the slog as long as the current commit size is less than the
950 * limit or the total list size is less than 2X the limit. Limit
951 * checking is disabled by setting zil_slog_limit to UINT64_MAX.
953 unsigned long zil_slog_limit = 1024 * 1024;
954 #define USE_SLOG(zilog) (((zilog)->zl_cur_used < zil_slog_limit) || \
955 ((zilog)->zl_itx_list_sz < (zil_slog_limit << 1)))
958 * Start a log block write and advance to the next log block.
959 * Calls are serialized.
962 zil_lwb_write_start(zilog_t *zilog, lwb_t *lwb)
966 spa_t *spa = zilog->zl_spa;
970 uint64_t zil_blksz, wsz;
974 if (BP_GET_CHECKSUM(&lwb->lwb_blk) == ZIO_CHECKSUM_ZILOG2) {
975 zilc = (zil_chain_t *)lwb->lwb_buf;
976 bp = &zilc->zc_next_blk;
978 zilc = (zil_chain_t *)(lwb->lwb_buf + lwb->lwb_sz);
979 bp = &zilc->zc_next_blk;
982 ASSERT(lwb->lwb_nused <= lwb->lwb_sz);
985 * Allocate the next block and save its address in this block
986 * before writing it in order to establish the log chain.
987 * Note that if the allocation of nlwb synced before we wrote
988 * the block that points at it (lwb), we'd leak it if we crashed.
989 * Therefore, we don't do dmu_tx_commit() until zil_lwb_write_done().
990 * We dirty the dataset to ensure that zil_sync() will be called
991 * to clean up in the event of allocation failure or I/O failure.
993 tx = dmu_tx_create(zilog->zl_os);
994 VERIFY(dmu_tx_assign(tx, TXG_WAIT) == 0);
995 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
996 txg = dmu_tx_get_txg(tx);
1001 * Log blocks are pre-allocated. Here we select the size of the next
1002 * block, based on size used in the last block.
1003 * - first find the smallest bucket that will fit the block from a
1004 * limited set of block sizes. This is because it's faster to write
1005 * blocks allocated from the same metaslab as they are adjacent or
1007 * - next find the maximum from the new suggested size and an array of
1008 * previous sizes. This lessens a picket fence effect of wrongly
1009 * guesssing the size if we have a stream of say 2k, 64k, 2k, 64k
1012 * Note we only write what is used, but we can't just allocate
1013 * the maximum block size because we can exhaust the available
1016 zil_blksz = zilog->zl_cur_used + sizeof (zil_chain_t);
1017 for (i = 0; zil_blksz > zil_block_buckets[i]; i++)
1019 zil_blksz = zil_block_buckets[i];
1020 if (zil_blksz == UINT64_MAX)
1021 zil_blksz = SPA_OLD_MAXBLOCKSIZE;
1022 zilog->zl_prev_blks[zilog->zl_prev_rotor] = zil_blksz;
1023 for (i = 0; i < ZIL_PREV_BLKS; i++)
1024 zil_blksz = MAX(zil_blksz, zilog->zl_prev_blks[i]);
1025 zilog->zl_prev_rotor = (zilog->zl_prev_rotor + 1) & (ZIL_PREV_BLKS - 1);
1028 use_slog = USE_SLOG(zilog);
1029 error = zio_alloc_zil(spa, txg, bp, zil_blksz,
1032 ZIL_STAT_BUMP(zil_itx_metaslab_slog_count);
1033 ZIL_STAT_INCR(zil_itx_metaslab_slog_bytes, lwb->lwb_nused);
1035 ZIL_STAT_BUMP(zil_itx_metaslab_normal_count);
1036 ZIL_STAT_INCR(zil_itx_metaslab_normal_bytes, lwb->lwb_nused);
1039 ASSERT3U(bp->blk_birth, ==, txg);
1040 bp->blk_cksum = lwb->lwb_blk.blk_cksum;
1041 bp->blk_cksum.zc_word[ZIL_ZC_SEQ]++;
1044 * Allocate a new log write buffer (lwb).
1046 nlwb = zil_alloc_lwb(zilog, bp, txg, TRUE);
1048 /* Record the block for later vdev flushing */
1049 zil_add_block(zilog, &lwb->lwb_blk);
1052 if (BP_GET_CHECKSUM(&lwb->lwb_blk) == ZIO_CHECKSUM_ZILOG2) {
1053 /* For Slim ZIL only write what is used. */
1054 wsz = P2ROUNDUP_TYPED(lwb->lwb_nused, ZIL_MIN_BLKSZ, uint64_t);
1055 ASSERT3U(wsz, <=, lwb->lwb_sz);
1056 zio_shrink(lwb->lwb_zio, wsz);
1063 zilc->zc_nused = lwb->lwb_nused;
1064 zilc->zc_eck.zec_cksum = lwb->lwb_blk.blk_cksum;
1067 * clear unused data for security
1069 bzero(lwb->lwb_buf + lwb->lwb_nused, wsz - lwb->lwb_nused);
1071 zio_nowait(lwb->lwb_zio); /* Kick off the write for the old log block */
1074 * If there was an allocation failure then nlwb will be null which
1075 * forces a txg_wait_synced().
1081 zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb)
1083 lr_t *lrc = &itx->itx_lr; /* common log record */
1084 lr_write_t *lrw = (lr_write_t *)lrc;
1086 uint64_t txg = lrc->lrc_txg;
1087 uint64_t reclen = lrc->lrc_reclen;
1093 ASSERT(lwb->lwb_buf != NULL);
1094 ASSERT(zilog_is_dirty(zilog) ||
1095 spa_freeze_txg(zilog->zl_spa) != UINT64_MAX);
1097 if (lrc->lrc_txtype == TX_WRITE && itx->itx_wr_state == WR_NEED_COPY)
1098 dlen = P2ROUNDUP_TYPED(
1099 lrw->lr_length, sizeof (uint64_t), uint64_t);
1101 zilog->zl_cur_used += (reclen + dlen);
1103 zil_lwb_write_init(zilog, lwb);
1106 * If this record won't fit in the current log block, start a new one.
1108 if (lwb->lwb_nused + reclen + dlen > lwb->lwb_sz) {
1109 lwb = zil_lwb_write_start(zilog, lwb);
1112 zil_lwb_write_init(zilog, lwb);
1113 ASSERT(LWB_EMPTY(lwb));
1114 if (lwb->lwb_nused + reclen + dlen > lwb->lwb_sz) {
1115 txg_wait_synced(zilog->zl_dmu_pool, txg);
1120 lr_buf = lwb->lwb_buf + lwb->lwb_nused;
1121 bcopy(lrc, lr_buf, reclen);
1122 lrc = (lr_t *)lr_buf;
1123 lrw = (lr_write_t *)lrc;
1125 ZIL_STAT_BUMP(zil_itx_count);
1128 * If it's a write, fetch the data or get its blkptr as appropriate.
1130 if (lrc->lrc_txtype == TX_WRITE) {
1131 if (txg > spa_freeze_txg(zilog->zl_spa))
1132 txg_wait_synced(zilog->zl_dmu_pool, txg);
1133 if (itx->itx_wr_state == WR_COPIED) {
1134 ZIL_STAT_BUMP(zil_itx_copied_count);
1135 ZIL_STAT_INCR(zil_itx_copied_bytes, lrw->lr_length);
1141 ASSERT(itx->itx_wr_state == WR_NEED_COPY);
1142 dbuf = lr_buf + reclen;
1143 lrw->lr_common.lrc_reclen += dlen;
1144 ZIL_STAT_BUMP(zil_itx_needcopy_count);
1145 ZIL_STAT_INCR(zil_itx_needcopy_bytes,
1148 ASSERT(itx->itx_wr_state == WR_INDIRECT);
1150 ZIL_STAT_BUMP(zil_itx_indirect_count);
1151 ZIL_STAT_INCR(zil_itx_indirect_bytes,
1154 error = zilog->zl_get_data(
1155 itx->itx_private, lrw, dbuf, lwb->lwb_zio);
1157 txg_wait_synced(zilog->zl_dmu_pool, txg);
1161 ASSERT(error == ENOENT || error == EEXIST ||
1169 * We're actually making an entry, so update lrc_seq to be the
1170 * log record sequence number. Note that this is generally not
1171 * equal to the itx sequence number because not all transactions
1172 * are synchronous, and sometimes spa_sync() gets there first.
1174 lrc->lrc_seq = ++zilog->zl_lr_seq; /* we are single threaded */
1175 lwb->lwb_nused += reclen + dlen;
1176 lwb->lwb_max_txg = MAX(lwb->lwb_max_txg, txg);
1177 ASSERT3U(lwb->lwb_nused, <=, lwb->lwb_sz);
1178 ASSERT0(P2PHASE(lwb->lwb_nused, sizeof (uint64_t)));
1184 zil_itx_create(uint64_t txtype, size_t lrsize)
1188 lrsize = P2ROUNDUP_TYPED(lrsize, sizeof (uint64_t), size_t);
1190 itx = zio_data_buf_alloc(offsetof(itx_t, itx_lr) + lrsize);
1191 itx->itx_lr.lrc_txtype = txtype;
1192 itx->itx_lr.lrc_reclen = lrsize;
1193 itx->itx_sod = lrsize; /* if write & WR_NEED_COPY will be increased */
1194 itx->itx_lr.lrc_seq = 0; /* defensive */
1195 itx->itx_sync = B_TRUE; /* default is synchronous */
1196 itx->itx_callback = NULL;
1197 itx->itx_callback_data = NULL;
1203 zil_itx_destroy(itx_t *itx)
1205 zio_data_buf_free(itx, offsetof(itx_t, itx_lr)+itx->itx_lr.lrc_reclen);
1209 * Free up the sync and async itxs. The itxs_t has already been detached
1210 * so no locks are needed.
1213 zil_itxg_clean(itxs_t *itxs)
1219 itx_async_node_t *ian;
1221 list = &itxs->i_sync_list;
1222 while ((itx = list_head(list)) != NULL) {
1223 if (itx->itx_callback != NULL)
1224 itx->itx_callback(itx->itx_callback_data);
1225 list_remove(list, itx);
1226 zil_itx_destroy(itx);
1230 t = &itxs->i_async_tree;
1231 while ((ian = avl_destroy_nodes(t, &cookie)) != NULL) {
1232 list = &ian->ia_list;
1233 while ((itx = list_head(list)) != NULL) {
1234 if (itx->itx_callback != NULL)
1235 itx->itx_callback(itx->itx_callback_data);
1236 list_remove(list, itx);
1237 zil_itx_destroy(itx);
1240 kmem_free(ian, sizeof (itx_async_node_t));
1244 kmem_free(itxs, sizeof (itxs_t));
1248 zil_aitx_compare(const void *x1, const void *x2)
1250 const uint64_t o1 = ((itx_async_node_t *)x1)->ia_foid;
1251 const uint64_t o2 = ((itx_async_node_t *)x2)->ia_foid;
1253 return (AVL_CMP(o1, o2));
1257 * Remove all async itx with the given oid.
1260 zil_remove_async(zilog_t *zilog, uint64_t oid)
1263 itx_async_node_t *ian;
1270 list_create(&clean_list, sizeof (itx_t), offsetof(itx_t, itx_node));
1272 if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */
1275 otxg = spa_last_synced_txg(zilog->zl_spa) + 1;
1277 for (txg = otxg; txg < (otxg + TXG_CONCURRENT_STATES); txg++) {
1278 itxg_t *itxg = &zilog->zl_itxg[txg & TXG_MASK];
1280 mutex_enter(&itxg->itxg_lock);
1281 if (itxg->itxg_txg != txg) {
1282 mutex_exit(&itxg->itxg_lock);
1287 * Locate the object node and append its list.
1289 t = &itxg->itxg_itxs->i_async_tree;
1290 ian = avl_find(t, &oid, &where);
1292 list_move_tail(&clean_list, &ian->ia_list);
1293 mutex_exit(&itxg->itxg_lock);
1295 while ((itx = list_head(&clean_list)) != NULL) {
1296 if (itx->itx_callback != NULL)
1297 itx->itx_callback(itx->itx_callback_data);
1298 list_remove(&clean_list, itx);
1299 zil_itx_destroy(itx);
1301 list_destroy(&clean_list);
1305 zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx)
1309 itxs_t *itxs, *clean = NULL;
1312 * Object ids can be re-instantiated in the next txg so
1313 * remove any async transactions to avoid future leaks.
1314 * This can happen if a fsync occurs on the re-instantiated
1315 * object for a WR_INDIRECT or WR_NEED_COPY write, which gets
1316 * the new file data and flushes a write record for the old object.
1318 if ((itx->itx_lr.lrc_txtype & ~TX_CI) == TX_REMOVE)
1319 zil_remove_async(zilog, itx->itx_oid);
1322 * Ensure the data of a renamed file is committed before the rename.
1324 if ((itx->itx_lr.lrc_txtype & ~TX_CI) == TX_RENAME)
1325 zil_async_to_sync(zilog, itx->itx_oid);
1327 if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX)
1330 txg = dmu_tx_get_txg(tx);
1332 itxg = &zilog->zl_itxg[txg & TXG_MASK];
1333 mutex_enter(&itxg->itxg_lock);
1334 itxs = itxg->itxg_itxs;
1335 if (itxg->itxg_txg != txg) {
1338 * The zil_clean callback hasn't got around to cleaning
1339 * this itxg. Save the itxs for release below.
1340 * This should be rare.
1342 atomic_add_64(&zilog->zl_itx_list_sz, -itxg->itxg_sod);
1344 clean = itxg->itxg_itxs;
1346 ASSERT(itxg->itxg_sod == 0);
1347 itxg->itxg_txg = txg;
1348 itxs = itxg->itxg_itxs = kmem_zalloc(sizeof (itxs_t),
1351 list_create(&itxs->i_sync_list, sizeof (itx_t),
1352 offsetof(itx_t, itx_node));
1353 avl_create(&itxs->i_async_tree, zil_aitx_compare,
1354 sizeof (itx_async_node_t),
1355 offsetof(itx_async_node_t, ia_node));
1357 if (itx->itx_sync) {
1358 list_insert_tail(&itxs->i_sync_list, itx);
1359 atomic_add_64(&zilog->zl_itx_list_sz, itx->itx_sod);
1360 itxg->itxg_sod += itx->itx_sod;
1362 avl_tree_t *t = &itxs->i_async_tree;
1364 LR_FOID_GET_OBJ(((lr_ooo_t *)&itx->itx_lr)->lr_foid);
1365 itx_async_node_t *ian;
1368 ian = avl_find(t, &foid, &where);
1370 ian = kmem_alloc(sizeof (itx_async_node_t),
1372 list_create(&ian->ia_list, sizeof (itx_t),
1373 offsetof(itx_t, itx_node));
1374 ian->ia_foid = foid;
1375 avl_insert(t, ian, where);
1377 list_insert_tail(&ian->ia_list, itx);
1380 itx->itx_lr.lrc_txg = dmu_tx_get_txg(tx);
1381 zilog_dirty(zilog, txg);
1382 mutex_exit(&itxg->itxg_lock);
1384 /* Release the old itxs now we've dropped the lock */
1386 zil_itxg_clean(clean);
1390 * If there are any in-memory intent log transactions which have now been
1391 * synced then start up a taskq to free them. We should only do this after we
1392 * have written out the uberblocks (i.e. txg has been comitted) so that
1393 * don't inadvertently clean out in-memory log records that would be required
1397 zil_clean(zilog_t *zilog, uint64_t synced_txg)
1399 itxg_t *itxg = &zilog->zl_itxg[synced_txg & TXG_MASK];
1402 mutex_enter(&itxg->itxg_lock);
1403 if (itxg->itxg_itxs == NULL || itxg->itxg_txg == ZILTEST_TXG) {
1404 mutex_exit(&itxg->itxg_lock);
1407 ASSERT3U(itxg->itxg_txg, <=, synced_txg);
1408 ASSERT(itxg->itxg_txg != 0);
1409 ASSERT(zilog->zl_clean_taskq != NULL);
1410 atomic_add_64(&zilog->zl_itx_list_sz, -itxg->itxg_sod);
1412 clean_me = itxg->itxg_itxs;
1413 itxg->itxg_itxs = NULL;
1415 mutex_exit(&itxg->itxg_lock);
1417 * Preferably start a task queue to free up the old itxs but
1418 * if taskq_dispatch can't allocate resources to do that then
1419 * free it in-line. This should be rare. Note, using TQ_SLEEP
1420 * created a bad performance problem.
1422 if (taskq_dispatch(zilog->zl_clean_taskq,
1423 (void (*)(void *))zil_itxg_clean, clean_me, TQ_NOSLEEP) == 0)
1424 zil_itxg_clean(clean_me);
1428 * Get the list of itxs to commit into zl_itx_commit_list.
1431 zil_get_commit_list(zilog_t *zilog)
1434 list_t *commit_list = &zilog->zl_itx_commit_list;
1435 uint64_t push_sod = 0;
1437 if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */
1440 otxg = spa_last_synced_txg(zilog->zl_spa) + 1;
1442 for (txg = otxg; txg < (otxg + TXG_CONCURRENT_STATES); txg++) {
1443 itxg_t *itxg = &zilog->zl_itxg[txg & TXG_MASK];
1445 mutex_enter(&itxg->itxg_lock);
1446 if (itxg->itxg_txg != txg) {
1447 mutex_exit(&itxg->itxg_lock);
1451 list_move_tail(commit_list, &itxg->itxg_itxs->i_sync_list);
1452 push_sod += itxg->itxg_sod;
1455 mutex_exit(&itxg->itxg_lock);
1457 atomic_add_64(&zilog->zl_itx_list_sz, -push_sod);
1461 * Move the async itxs for a specified object to commit into sync lists.
1464 zil_async_to_sync(zilog_t *zilog, uint64_t foid)
1467 itx_async_node_t *ian;
1471 if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */
1474 otxg = spa_last_synced_txg(zilog->zl_spa) + 1;
1476 for (txg = otxg; txg < (otxg + TXG_CONCURRENT_STATES); txg++) {
1477 itxg_t *itxg = &zilog->zl_itxg[txg & TXG_MASK];
1479 mutex_enter(&itxg->itxg_lock);
1480 if (itxg->itxg_txg != txg) {
1481 mutex_exit(&itxg->itxg_lock);
1486 * If a foid is specified then find that node and append its
1487 * list. Otherwise walk the tree appending all the lists
1488 * to the sync list. We add to the end rather than the
1489 * beginning to ensure the create has happened.
1491 t = &itxg->itxg_itxs->i_async_tree;
1493 ian = avl_find(t, &foid, &where);
1495 list_move_tail(&itxg->itxg_itxs->i_sync_list,
1499 void *cookie = NULL;
1501 while ((ian = avl_destroy_nodes(t, &cookie)) != NULL) {
1502 list_move_tail(&itxg->itxg_itxs->i_sync_list,
1504 list_destroy(&ian->ia_list);
1505 kmem_free(ian, sizeof (itx_async_node_t));
1508 mutex_exit(&itxg->itxg_lock);
1513 zil_commit_writer(zilog_t *zilog)
1518 spa_t *spa = zilog->zl_spa;
1521 ASSERT(zilog->zl_root_zio == NULL);
1523 mutex_exit(&zilog->zl_lock);
1525 zil_get_commit_list(zilog);
1528 * Return if there's nothing to commit before we dirty the fs by
1529 * calling zil_create().
1531 if (list_head(&zilog->zl_itx_commit_list) == NULL) {
1532 mutex_enter(&zilog->zl_lock);
1536 if (zilog->zl_suspend) {
1539 lwb = list_tail(&zilog->zl_lwb_list);
1541 lwb = zil_create(zilog);
1544 DTRACE_PROBE1(zil__cw1, zilog_t *, zilog);
1545 for (itx = list_head(&zilog->zl_itx_commit_list); itx != NULL;
1546 itx = list_next(&zilog->zl_itx_commit_list, itx)) {
1547 txg = itx->itx_lr.lrc_txg;
1550 if (txg > spa_last_synced_txg(spa) || txg > spa_freeze_txg(spa))
1551 lwb = zil_lwb_commit(zilog, itx, lwb);
1553 DTRACE_PROBE1(zil__cw2, zilog_t *, zilog);
1555 /* write the last block out */
1556 if (lwb != NULL && lwb->lwb_zio != NULL)
1557 lwb = zil_lwb_write_start(zilog, lwb);
1559 zilog->zl_cur_used = 0;
1562 * Wait if necessary for the log blocks to be on stable storage.
1564 if (zilog->zl_root_zio) {
1565 error = zio_wait(zilog->zl_root_zio);
1566 zilog->zl_root_zio = NULL;
1567 zil_flush_vdevs(zilog);
1570 if (error || lwb == NULL)
1571 txg_wait_synced(zilog->zl_dmu_pool, 0);
1573 while ((itx = list_head(&zilog->zl_itx_commit_list))) {
1574 txg = itx->itx_lr.lrc_txg;
1577 if (itx->itx_callback != NULL)
1578 itx->itx_callback(itx->itx_callback_data);
1579 list_remove(&zilog->zl_itx_commit_list, itx);
1580 zil_itx_destroy(itx);
1583 mutex_enter(&zilog->zl_lock);
1586 * Remember the highest committed log sequence number for ztest.
1587 * We only update this value when all the log writes succeeded,
1588 * because ztest wants to ASSERT that it got the whole log chain.
1590 if (error == 0 && lwb != NULL)
1591 zilog->zl_commit_lr_seq = zilog->zl_lr_seq;
1595 * Commit zfs transactions to stable storage.
1596 * If foid is 0 push out all transactions, otherwise push only those
1597 * for that object or might reference that object.
1599 * itxs are committed in batches. In a heavily stressed zil there will be
1600 * a commit writer thread who is writing out a bunch of itxs to the log
1601 * for a set of committing threads (cthreads) in the same batch as the writer.
1602 * Those cthreads are all waiting on the same cv for that batch.
1604 * There will also be a different and growing batch of threads that are
1605 * waiting to commit (qthreads). When the committing batch completes
1606 * a transition occurs such that the cthreads exit and the qthreads become
1607 * cthreads. One of the new cthreads becomes the writer thread for the
1608 * batch. Any new threads arriving become new qthreads.
1610 * Only 2 condition variables are needed and there's no transition
1611 * between the two cvs needed. They just flip-flop between qthreads
1614 * Using this scheme we can efficiently wakeup up only those threads
1615 * that have been committed.
1618 zil_commit(zilog_t *zilog, uint64_t foid)
1622 if (zilog->zl_sync == ZFS_SYNC_DISABLED)
1625 ZIL_STAT_BUMP(zil_commit_count);
1627 /* move the async itxs for the foid to the sync queues */
1628 zil_async_to_sync(zilog, foid);
1630 mutex_enter(&zilog->zl_lock);
1631 mybatch = zilog->zl_next_batch;
1632 while (zilog->zl_writer) {
1633 cv_wait(&zilog->zl_cv_batch[mybatch & 1], &zilog->zl_lock);
1634 if (mybatch <= zilog->zl_com_batch) {
1635 mutex_exit(&zilog->zl_lock);
1640 zilog->zl_next_batch++;
1641 zilog->zl_writer = B_TRUE;
1642 ZIL_STAT_BUMP(zil_commit_writer_count);
1643 zil_commit_writer(zilog);
1644 zilog->zl_com_batch = mybatch;
1645 zilog->zl_writer = B_FALSE;
1647 /* wake up one thread to become the next writer */
1648 cv_signal(&zilog->zl_cv_batch[(mybatch+1) & 1]);
1650 /* wake up all threads waiting for this batch to be committed */
1651 cv_broadcast(&zilog->zl_cv_batch[mybatch & 1]);
1653 mutex_exit(&zilog->zl_lock);
1657 * Called in syncing context to free committed log blocks and update log header.
1660 zil_sync(zilog_t *zilog, dmu_tx_t *tx)
1662 zil_header_t *zh = zil_header_in_syncing_context(zilog);
1663 uint64_t txg = dmu_tx_get_txg(tx);
1664 spa_t *spa = zilog->zl_spa;
1665 uint64_t *replayed_seq = &zilog->zl_replayed_seq[txg & TXG_MASK];
1669 * We don't zero out zl_destroy_txg, so make sure we don't try
1670 * to destroy it twice.
1672 if (spa_sync_pass(spa) != 1)
1675 mutex_enter(&zilog->zl_lock);
1677 ASSERT(zilog->zl_stop_sync == 0);
1679 if (*replayed_seq != 0) {
1680 ASSERT(zh->zh_replay_seq < *replayed_seq);
1681 zh->zh_replay_seq = *replayed_seq;
1685 if (zilog->zl_destroy_txg == txg) {
1686 blkptr_t blk = zh->zh_log;
1688 ASSERT(list_head(&zilog->zl_lwb_list) == NULL);
1690 bzero(zh, sizeof (zil_header_t));
1691 bzero(zilog->zl_replayed_seq, sizeof (zilog->zl_replayed_seq));
1693 if (zilog->zl_keep_first) {
1695 * If this block was part of log chain that couldn't
1696 * be claimed because a device was missing during
1697 * zil_claim(), but that device later returns,
1698 * then this block could erroneously appear valid.
1699 * To guard against this, assign a new GUID to the new
1700 * log chain so it doesn't matter what blk points to.
1702 zil_init_log_chain(zilog, &blk);
1707 while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) {
1708 zh->zh_log = lwb->lwb_blk;
1709 if (lwb->lwb_buf != NULL || lwb->lwb_max_txg > txg)
1712 ASSERT(lwb->lwb_zio == NULL);
1714 list_remove(&zilog->zl_lwb_list, lwb);
1715 zio_free_zil(spa, txg, &lwb->lwb_blk);
1716 kmem_cache_free(zil_lwb_cache, lwb);
1719 * If we don't have anything left in the lwb list then
1720 * we've had an allocation failure and we need to zero
1721 * out the zil_header blkptr so that we don't end
1722 * up freeing the same block twice.
1724 if (list_head(&zilog->zl_lwb_list) == NULL)
1725 BP_ZERO(&zh->zh_log);
1729 * Remove fastwrite on any blocks that have been pre-allocated for
1730 * the next commit. This prevents fastwrite counter pollution by
1731 * unused, long-lived LWBs.
1733 for (; lwb != NULL; lwb = list_next(&zilog->zl_lwb_list, lwb)) {
1734 if (lwb->lwb_fastwrite && !lwb->lwb_zio) {
1735 metaslab_fastwrite_unmark(zilog->zl_spa, &lwb->lwb_blk);
1736 lwb->lwb_fastwrite = 0;
1740 mutex_exit(&zilog->zl_lock);
1746 zil_lwb_cache = kmem_cache_create("zil_lwb_cache",
1747 sizeof (struct lwb), 0, NULL, NULL, NULL, NULL, NULL, 0);
1749 zil_ksp = kstat_create("zfs", 0, "zil", "misc",
1750 KSTAT_TYPE_NAMED, sizeof (zil_stats) / sizeof (kstat_named_t),
1751 KSTAT_FLAG_VIRTUAL);
1753 if (zil_ksp != NULL) {
1754 zil_ksp->ks_data = &zil_stats;
1755 kstat_install(zil_ksp);
1762 kmem_cache_destroy(zil_lwb_cache);
1764 if (zil_ksp != NULL) {
1765 kstat_delete(zil_ksp);
1771 zil_set_sync(zilog_t *zilog, uint64_t sync)
1773 zilog->zl_sync = sync;
1777 zil_set_logbias(zilog_t *zilog, uint64_t logbias)
1779 zilog->zl_logbias = logbias;
1783 zil_alloc(objset_t *os, zil_header_t *zh_phys)
1788 zilog = kmem_zalloc(sizeof (zilog_t), KM_SLEEP);
1790 zilog->zl_header = zh_phys;
1792 zilog->zl_spa = dmu_objset_spa(os);
1793 zilog->zl_dmu_pool = dmu_objset_pool(os);
1794 zilog->zl_destroy_txg = TXG_INITIAL - 1;
1795 zilog->zl_logbias = dmu_objset_logbias(os);
1796 zilog->zl_sync = dmu_objset_syncprop(os);
1797 zilog->zl_next_batch = 1;
1799 mutex_init(&zilog->zl_lock, NULL, MUTEX_DEFAULT, NULL);
1801 for (i = 0; i < TXG_SIZE; i++) {
1802 mutex_init(&zilog->zl_itxg[i].itxg_lock, NULL,
1803 MUTEX_DEFAULT, NULL);
1806 list_create(&zilog->zl_lwb_list, sizeof (lwb_t),
1807 offsetof(lwb_t, lwb_node));
1809 list_create(&zilog->zl_itx_commit_list, sizeof (itx_t),
1810 offsetof(itx_t, itx_node));
1812 mutex_init(&zilog->zl_vdev_lock, NULL, MUTEX_DEFAULT, NULL);
1814 avl_create(&zilog->zl_vdev_tree, zil_vdev_compare,
1815 sizeof (zil_vdev_node_t), offsetof(zil_vdev_node_t, zv_node));
1817 cv_init(&zilog->zl_cv_writer, NULL, CV_DEFAULT, NULL);
1818 cv_init(&zilog->zl_cv_suspend, NULL, CV_DEFAULT, NULL);
1819 cv_init(&zilog->zl_cv_batch[0], NULL, CV_DEFAULT, NULL);
1820 cv_init(&zilog->zl_cv_batch[1], NULL, CV_DEFAULT, NULL);
1826 zil_free(zilog_t *zilog)
1830 zilog->zl_stop_sync = 1;
1832 ASSERT0(zilog->zl_suspend);
1833 ASSERT0(zilog->zl_suspending);
1835 ASSERT(list_is_empty(&zilog->zl_lwb_list));
1836 list_destroy(&zilog->zl_lwb_list);
1838 avl_destroy(&zilog->zl_vdev_tree);
1839 mutex_destroy(&zilog->zl_vdev_lock);
1841 ASSERT(list_is_empty(&zilog->zl_itx_commit_list));
1842 list_destroy(&zilog->zl_itx_commit_list);
1844 for (i = 0; i < TXG_SIZE; i++) {
1846 * It's possible for an itx to be generated that doesn't dirty
1847 * a txg (e.g. ztest TX_TRUNCATE). So there's no zil_clean()
1848 * callback to remove the entry. We remove those here.
1850 * Also free up the ziltest itxs.
1852 if (zilog->zl_itxg[i].itxg_itxs)
1853 zil_itxg_clean(zilog->zl_itxg[i].itxg_itxs);
1854 mutex_destroy(&zilog->zl_itxg[i].itxg_lock);
1857 mutex_destroy(&zilog->zl_lock);
1859 cv_destroy(&zilog->zl_cv_writer);
1860 cv_destroy(&zilog->zl_cv_suspend);
1861 cv_destroy(&zilog->zl_cv_batch[0]);
1862 cv_destroy(&zilog->zl_cv_batch[1]);
1864 kmem_free(zilog, sizeof (zilog_t));
1868 * Open an intent log.
1871 zil_open(objset_t *os, zil_get_data_t *get_data)
1873 zilog_t *zilog = dmu_objset_zil(os);
1875 ASSERT(zilog->zl_clean_taskq == NULL);
1876 ASSERT(zilog->zl_get_data == NULL);
1877 ASSERT(list_is_empty(&zilog->zl_lwb_list));
1879 zilog->zl_get_data = get_data;
1880 zilog->zl_clean_taskq = taskq_create("zil_clean", 1, defclsyspri,
1881 2, 2, TASKQ_PREPOPULATE);
1887 * Close an intent log.
1890 zil_close(zilog_t *zilog)
1895 zil_commit(zilog, 0); /* commit all itx */
1898 * The lwb_max_txg for the stubby lwb will reflect the last activity
1899 * for the zil. After a txg_wait_synced() on the txg we know all the
1900 * callbacks have occurred that may clean the zil. Only then can we
1901 * destroy the zl_clean_taskq.
1903 mutex_enter(&zilog->zl_lock);
1904 lwb = list_tail(&zilog->zl_lwb_list);
1906 txg = lwb->lwb_max_txg;
1907 mutex_exit(&zilog->zl_lock);
1909 txg_wait_synced(zilog->zl_dmu_pool, txg);
1910 if (txg < spa_freeze_txg(zilog->zl_spa))
1911 ASSERT(!zilog_is_dirty(zilog));
1913 taskq_destroy(zilog->zl_clean_taskq);
1914 zilog->zl_clean_taskq = NULL;
1915 zilog->zl_get_data = NULL;
1918 * We should have only one LWB left on the list; remove it now.
1920 mutex_enter(&zilog->zl_lock);
1921 lwb = list_head(&zilog->zl_lwb_list);
1923 ASSERT(lwb == list_tail(&zilog->zl_lwb_list));
1924 ASSERT(lwb->lwb_zio == NULL);
1925 if (lwb->lwb_fastwrite)
1926 metaslab_fastwrite_unmark(zilog->zl_spa, &lwb->lwb_blk);
1927 list_remove(&zilog->zl_lwb_list, lwb);
1928 zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);
1929 kmem_cache_free(zil_lwb_cache, lwb);
1931 mutex_exit(&zilog->zl_lock);
1934 static char *suspend_tag = "zil suspending";
1937 * Suspend an intent log. While in suspended mode, we still honor
1938 * synchronous semantics, but we rely on txg_wait_synced() to do it.
1939 * On old version pools, we suspend the log briefly when taking a
1940 * snapshot so that it will have an empty intent log.
1942 * Long holds are not really intended to be used the way we do here --
1943 * held for such a short time. A concurrent caller of dsl_dataset_long_held()
1944 * could fail. Therefore we take pains to only put a long hold if it is
1945 * actually necessary. Fortunately, it will only be necessary if the
1946 * objset is currently mounted (or the ZVOL equivalent). In that case it
1947 * will already have a long hold, so we are not really making things any worse.
1949 * Ideally, we would locate the existing long-holder (i.e. the zfsvfs_t or
1950 * zvol_state_t), and use their mechanism to prevent their hold from being
1951 * dropped (e.g. VFS_HOLD()). However, that would be even more pain for
1954 * if cookiep == NULL, this does both the suspend & resume.
1955 * Otherwise, it returns with the dataset "long held", and the cookie
1956 * should be passed into zil_resume().
1959 zil_suspend(const char *osname, void **cookiep)
1963 const zil_header_t *zh;
1966 error = dmu_objset_hold(osname, suspend_tag, &os);
1969 zilog = dmu_objset_zil(os);
1971 mutex_enter(&zilog->zl_lock);
1972 zh = zilog->zl_header;
1974 if (zh->zh_flags & ZIL_REPLAY_NEEDED) { /* unplayed log */
1975 mutex_exit(&zilog->zl_lock);
1976 dmu_objset_rele(os, suspend_tag);
1977 return (SET_ERROR(EBUSY));
1981 * Don't put a long hold in the cases where we can avoid it. This
1982 * is when there is no cookie so we are doing a suspend & resume
1983 * (i.e. called from zil_vdev_offline()), and there's nothing to do
1984 * for the suspend because it's already suspended, or there's no ZIL.
1986 if (cookiep == NULL && !zilog->zl_suspending &&
1987 (zilog->zl_suspend > 0 || BP_IS_HOLE(&zh->zh_log))) {
1988 mutex_exit(&zilog->zl_lock);
1989 dmu_objset_rele(os, suspend_tag);
1993 dsl_dataset_long_hold(dmu_objset_ds(os), suspend_tag);
1994 dsl_pool_rele(dmu_objset_pool(os), suspend_tag);
1996 zilog->zl_suspend++;
1998 if (zilog->zl_suspend > 1) {
2000 * Someone else is already suspending it.
2001 * Just wait for them to finish.
2004 while (zilog->zl_suspending)
2005 cv_wait(&zilog->zl_cv_suspend, &zilog->zl_lock);
2006 mutex_exit(&zilog->zl_lock);
2008 if (cookiep == NULL)
2016 * If there is no pointer to an on-disk block, this ZIL must not
2017 * be active (e.g. filesystem not mounted), so there's nothing
2020 if (BP_IS_HOLE(&zh->zh_log)) {
2021 ASSERT(cookiep != NULL); /* fast path already handled */
2024 mutex_exit(&zilog->zl_lock);
2028 zilog->zl_suspending = B_TRUE;
2029 mutex_exit(&zilog->zl_lock);
2031 zil_commit(zilog, 0);
2033 zil_destroy(zilog, B_FALSE);
2035 mutex_enter(&zilog->zl_lock);
2036 zilog->zl_suspending = B_FALSE;
2037 cv_broadcast(&zilog->zl_cv_suspend);
2038 mutex_exit(&zilog->zl_lock);
2040 if (cookiep == NULL)
2048 zil_resume(void *cookie)
2050 objset_t *os = cookie;
2051 zilog_t *zilog = dmu_objset_zil(os);
2053 mutex_enter(&zilog->zl_lock);
2054 ASSERT(zilog->zl_suspend != 0);
2055 zilog->zl_suspend--;
2056 mutex_exit(&zilog->zl_lock);
2057 dsl_dataset_long_rele(dmu_objset_ds(os), suspend_tag);
2058 dsl_dataset_rele(dmu_objset_ds(os), suspend_tag);
2061 typedef struct zil_replay_arg {
2062 zil_replay_func_t *zr_replay;
2064 boolean_t zr_byteswap;
2069 zil_replay_error(zilog_t *zilog, lr_t *lr, int error)
2071 char name[ZFS_MAX_DATASET_NAME_LEN];
2073 zilog->zl_replaying_seq--; /* didn't actually replay this one */
2075 dmu_objset_name(zilog->zl_os, name);
2077 cmn_err(CE_WARN, "ZFS replay transaction error %d, "
2078 "dataset %s, seq 0x%llx, txtype %llu %s\n", error, name,
2079 (u_longlong_t)lr->lrc_seq,
2080 (u_longlong_t)(lr->lrc_txtype & ~TX_CI),
2081 (lr->lrc_txtype & TX_CI) ? "CI" : "");
2087 zil_replay_log_record(zilog_t *zilog, lr_t *lr, void *zra, uint64_t claim_txg)
2089 zil_replay_arg_t *zr = zra;
2090 const zil_header_t *zh = zilog->zl_header;
2091 uint64_t reclen = lr->lrc_reclen;
2092 uint64_t txtype = lr->lrc_txtype;
2095 zilog->zl_replaying_seq = lr->lrc_seq;
2097 if (lr->lrc_seq <= zh->zh_replay_seq) /* already replayed */
2100 if (lr->lrc_txg < claim_txg) /* already committed */
2103 /* Strip case-insensitive bit, still present in log record */
2106 if (txtype == 0 || txtype >= TX_MAX_TYPE)
2107 return (zil_replay_error(zilog, lr, EINVAL));
2110 * If this record type can be logged out of order, the object
2111 * (lr_foid) may no longer exist. That's legitimate, not an error.
2113 if (TX_OOO(txtype)) {
2114 error = dmu_object_info(zilog->zl_os,
2115 LR_FOID_GET_OBJ(((lr_ooo_t *)lr)->lr_foid), NULL);
2116 if (error == ENOENT || error == EEXIST)
2121 * Make a copy of the data so we can revise and extend it.
2123 bcopy(lr, zr->zr_lr, reclen);
2126 * If this is a TX_WRITE with a blkptr, suck in the data.
2128 if (txtype == TX_WRITE && reclen == sizeof (lr_write_t)) {
2129 error = zil_read_log_data(zilog, (lr_write_t *)lr,
2130 zr->zr_lr + reclen);
2132 return (zil_replay_error(zilog, lr, error));
2136 * The log block containing this lr may have been byteswapped
2137 * so that we can easily examine common fields like lrc_txtype.
2138 * However, the log is a mix of different record types, and only the
2139 * replay vectors know how to byteswap their records. Therefore, if
2140 * the lr was byteswapped, undo it before invoking the replay vector.
2142 if (zr->zr_byteswap)
2143 byteswap_uint64_array(zr->zr_lr, reclen);
2146 * We must now do two things atomically: replay this log record,
2147 * and update the log header sequence number to reflect the fact that
2148 * we did so. At the end of each replay function the sequence number
2149 * is updated if we are in replay mode.
2151 error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lr, zr->zr_byteswap);
2154 * The DMU's dnode layer doesn't see removes until the txg
2155 * commits, so a subsequent claim can spuriously fail with
2156 * EEXIST. So if we receive any error we try syncing out
2157 * any removes then retry the transaction. Note that we
2158 * specify B_FALSE for byteswap now, so we don't do it twice.
2160 txg_wait_synced(spa_get_dsl(zilog->zl_spa), 0);
2161 error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lr, B_FALSE);
2163 return (zil_replay_error(zilog, lr, error));
2170 zil_incr_blks(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
2172 zilog->zl_replay_blks++;
2178 * If this dataset has a non-empty intent log, replay it and destroy it.
2181 zil_replay(objset_t *os, void *arg, zil_replay_func_t replay_func[TX_MAX_TYPE])
2183 zilog_t *zilog = dmu_objset_zil(os);
2184 const zil_header_t *zh = zilog->zl_header;
2185 zil_replay_arg_t zr;
2187 if ((zh->zh_flags & ZIL_REPLAY_NEEDED) == 0) {
2188 zil_destroy(zilog, B_TRUE);
2192 zr.zr_replay = replay_func;
2194 zr.zr_byteswap = BP_SHOULD_BYTESWAP(&zh->zh_log);
2195 zr.zr_lr = vmem_alloc(2 * SPA_MAXBLOCKSIZE, KM_SLEEP);
2198 * Wait for in-progress removes to sync before starting replay.
2200 txg_wait_synced(zilog->zl_dmu_pool, 0);
2202 zilog->zl_replay = B_TRUE;
2203 zilog->zl_replay_time = ddi_get_lbolt();
2204 ASSERT(zilog->zl_replay_blks == 0);
2205 (void) zil_parse(zilog, zil_incr_blks, zil_replay_log_record, &zr,
2207 vmem_free(zr.zr_lr, 2 * SPA_MAXBLOCKSIZE);
2209 zil_destroy(zilog, B_FALSE);
2210 txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg);
2211 zilog->zl_replay = B_FALSE;
2215 zil_replaying(zilog_t *zilog, dmu_tx_t *tx)
2217 if (zilog->zl_sync == ZFS_SYNC_DISABLED)
2220 if (zilog->zl_replay) {
2221 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
2222 zilog->zl_replayed_seq[dmu_tx_get_txg(tx) & TXG_MASK] =
2223 zilog->zl_replaying_seq;
2232 zil_vdev_offline(const char *osname, void *arg)
2236 error = zil_suspend(osname, NULL);
2238 return (SET_ERROR(EEXIST));
2242 #if defined(_KERNEL) && defined(HAVE_SPL)
2243 EXPORT_SYMBOL(zil_alloc);
2244 EXPORT_SYMBOL(zil_free);
2245 EXPORT_SYMBOL(zil_open);
2246 EXPORT_SYMBOL(zil_close);
2247 EXPORT_SYMBOL(zil_replay);
2248 EXPORT_SYMBOL(zil_replaying);
2249 EXPORT_SYMBOL(zil_destroy);
2250 EXPORT_SYMBOL(zil_destroy_sync);
2251 EXPORT_SYMBOL(zil_itx_create);
2252 EXPORT_SYMBOL(zil_itx_destroy);
2253 EXPORT_SYMBOL(zil_itx_assign);
2254 EXPORT_SYMBOL(zil_commit);
2255 EXPORT_SYMBOL(zil_vdev_offline);
2256 EXPORT_SYMBOL(zil_claim);
2257 EXPORT_SYMBOL(zil_check_log_chain);
2258 EXPORT_SYMBOL(zil_sync);
2259 EXPORT_SYMBOL(zil_clean);
2260 EXPORT_SYMBOL(zil_suspend);
2261 EXPORT_SYMBOL(zil_resume);
2262 EXPORT_SYMBOL(zil_add_block);
2263 EXPORT_SYMBOL(zil_bp_tree_add);
2264 EXPORT_SYMBOL(zil_set_sync);
2265 EXPORT_SYMBOL(zil_set_logbias);
2267 module_param(zil_replay_disable, int, 0644);
2268 MODULE_PARM_DESC(zil_replay_disable, "Disable intent logging replay");
2270 module_param(zfs_nocacheflush, int, 0644);
2271 MODULE_PARM_DESC(zfs_nocacheflush, "Disable cache flushes");
2274 module_param(zil_slog_limit, ulong, 0644);
2275 MODULE_PARM_DESC(zil_slog_limit, "Max commit bytes to separate log device");