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.
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15 * If applicable, add the following below this CDDL HEADER, with the
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22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #include <sys/zfs_context.h>
32 #include <sys/resource.h>
34 #include <sys/zil_impl.h>
35 #include <sys/dsl_dataset.h>
37 #include <sys/dmu_tx.h>
40 * The zfs intent log (ZIL) saves transaction records of system calls
41 * that change the file system in memory with enough information
42 * to be able to replay them. These are stored in memory until
43 * either the DMU transaction group (txg) commits them to the stable pool
44 * and they can be discarded, or they are flushed to the stable log
45 * (also in the pool) due to a fsync, O_DSYNC or other synchronous
46 * requirement. In the event of a panic or power fail then those log
47 * records (transactions) are replayed.
49 * There is one ZIL per file system. Its on-disk (pool) format consists
56 * A log record holds a system call transaction. Log blocks can
57 * hold many log records and the blocks are chained together.
58 * Each ZIL block contains a block pointer (blkptr_t) to the next
59 * ZIL block in the chain. The ZIL header points to the first
60 * block in the chain. Note there is not a fixed place in the pool
61 * to hold blocks. They are dynamically allocated and freed as
62 * needed from the blocks available. Figure X shows the ZIL structure:
66 * This global ZIL switch affects all pools
68 int zil_disable = 0; /* disable intent logging */
69 SYSCTL_DECL(_vfs_zfs);
70 TUNABLE_INT("vfs.zfs.zil_disable", &zil_disable);
71 SYSCTL_INT(_vfs_zfs, OID_AUTO, zil_disable, CTLFLAG_RW, &zil_disable, 0,
72 "Disable ZFS Intent Log (ZIL)");
75 * Tunable parameter for debugging or performance analysis. Setting
76 * zfs_nocacheflush will cause corruption on power loss if a volatile
77 * out-of-order write cache is enabled.
79 boolean_t zfs_nocacheflush = B_FALSE;
80 TUNABLE_INT("vfs.zfs.cache_flush_disable", &zfs_nocacheflush);
81 SYSCTL_INT(_vfs_zfs, OID_AUTO, cache_flush_disable, CTLFLAG_RDTUN,
82 &zfs_nocacheflush, 0, "Disable cache flush");
84 static kmem_cache_t *zil_lwb_cache;
87 zil_dva_compare(const void *x1, const void *x2)
89 const dva_t *dva1 = x1;
90 const dva_t *dva2 = x2;
92 if (DVA_GET_VDEV(dva1) < DVA_GET_VDEV(dva2))
94 if (DVA_GET_VDEV(dva1) > DVA_GET_VDEV(dva2))
97 if (DVA_GET_OFFSET(dva1) < DVA_GET_OFFSET(dva2))
99 if (DVA_GET_OFFSET(dva1) > DVA_GET_OFFSET(dva2))
106 zil_dva_tree_init(avl_tree_t *t)
108 avl_create(t, zil_dva_compare, sizeof (zil_dva_node_t),
109 offsetof(zil_dva_node_t, zn_node));
113 zil_dva_tree_fini(avl_tree_t *t)
118 while ((zn = avl_destroy_nodes(t, &cookie)) != NULL)
119 kmem_free(zn, sizeof (zil_dva_node_t));
125 zil_dva_tree_add(avl_tree_t *t, dva_t *dva)
130 if (avl_find(t, dva, &where) != NULL)
133 zn = kmem_alloc(sizeof (zil_dva_node_t), KM_SLEEP);
135 avl_insert(t, zn, where);
140 static zil_header_t *
141 zil_header_in_syncing_context(zilog_t *zilog)
143 return ((zil_header_t *)zilog->zl_header);
147 zil_init_log_chain(zilog_t *zilog, blkptr_t *bp)
149 zio_cksum_t *zc = &bp->blk_cksum;
151 zc->zc_word[ZIL_ZC_GUID_0] = spa_get_random(-1ULL);
152 zc->zc_word[ZIL_ZC_GUID_1] = spa_get_random(-1ULL);
153 zc->zc_word[ZIL_ZC_OBJSET] = dmu_objset_id(zilog->zl_os);
154 zc->zc_word[ZIL_ZC_SEQ] = 1ULL;
158 * Read a log block, make sure it's valid, and byteswap it if necessary.
161 zil_read_log_block(zilog_t *zilog, const blkptr_t *bp, arc_buf_t **abufpp)
165 uint32_t aflags = ARC_WAIT;
168 zb.zb_objset = bp->blk_cksum.zc_word[ZIL_ZC_OBJSET];
171 zb.zb_blkid = bp->blk_cksum.zc_word[ZIL_ZC_SEQ];
176 * We shouldn't be doing any scrubbing while we're doing log
177 * replay, it's OK to not lock.
179 error = arc_read_nolock(NULL, zilog->zl_spa, &blk,
180 arc_getbuf_func, abufpp, ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL |
181 ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB, &aflags, &zb);
184 char *data = (*abufpp)->b_data;
185 uint64_t blksz = BP_GET_LSIZE(bp);
186 zil_trailer_t *ztp = (zil_trailer_t *)(data + blksz) - 1;
187 zio_cksum_t cksum = bp->blk_cksum;
190 * Validate the checksummed log block.
192 * Sequence numbers should be... sequential. The checksum
193 * verifier for the next block should be bp's checksum plus 1.
195 * Also check the log chain linkage and size used.
197 cksum.zc_word[ZIL_ZC_SEQ]++;
199 if (bcmp(&cksum, &ztp->zit_next_blk.blk_cksum,
200 sizeof (cksum)) || BP_IS_HOLE(&ztp->zit_next_blk) ||
201 (ztp->zit_nused > (blksz - sizeof (zil_trailer_t)))) {
206 VERIFY(arc_buf_remove_ref(*abufpp, abufpp) == 1);
211 dprintf("error %d on %llu:%llu\n", error, zb.zb_objset, zb.zb_blkid);
217 * Parse the intent log, and call parse_func for each valid record within.
218 * Return the highest sequence number.
221 zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func,
222 zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg)
224 const zil_header_t *zh = zilog->zl_header;
225 uint64_t claim_seq = zh->zh_claim_seq;
227 uint64_t max_seq = 0;
228 blkptr_t blk = zh->zh_log;
234 if (BP_IS_HOLE(&blk))
238 * Starting at the block pointed to by zh_log we read the log chain.
239 * For each block in the chain we strongly check that block to
240 * ensure its validity. We stop when an invalid block is found.
241 * For each block pointer in the chain we call parse_blk_func().
242 * For each record in each valid block we call parse_lr_func().
243 * If the log has been claimed, stop if we encounter a sequence
244 * number greater than the highest claimed sequence number.
246 zil_dva_tree_init(&zilog->zl_dva_tree);
248 seq = blk.blk_cksum.zc_word[ZIL_ZC_SEQ];
250 if (claim_seq != 0 && seq > claim_seq)
253 ASSERT(max_seq < seq);
256 error = zil_read_log_block(zilog, &blk, &abuf);
258 if (parse_blk_func != NULL)
259 parse_blk_func(zilog, &blk, arg, txg);
264 lrbuf = abuf->b_data;
265 ztp = (zil_trailer_t *)(lrbuf + BP_GET_LSIZE(&blk)) - 1;
266 blk = ztp->zit_next_blk;
268 if (parse_lr_func == NULL) {
269 VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1);
273 for (lrp = lrbuf; lrp < lrbuf + ztp->zit_nused; lrp += reclen) {
274 lr_t *lr = (lr_t *)lrp;
275 reclen = lr->lrc_reclen;
276 ASSERT3U(reclen, >=, sizeof (lr_t));
277 parse_lr_func(zilog, lr, arg, txg);
279 VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1);
281 zil_dva_tree_fini(&zilog->zl_dva_tree);
288 zil_claim_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t first_txg)
290 spa_t *spa = zilog->zl_spa;
294 * Claim log block if not already committed and not already claimed.
296 if (bp->blk_birth >= first_txg &&
297 zil_dva_tree_add(&zilog->zl_dva_tree, BP_IDENTITY(bp)) == 0) {
298 err = zio_wait(zio_claim(NULL, spa, first_txg, bp, NULL, NULL,
299 ZIO_FLAG_MUSTSUCCEED));
305 zil_claim_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t first_txg)
307 if (lrc->lrc_txtype == TX_WRITE) {
308 lr_write_t *lr = (lr_write_t *)lrc;
309 zil_claim_log_block(zilog, &lr->lr_blkptr, tx, first_txg);
315 zil_free_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t claim_txg)
317 zio_free_blk(zilog->zl_spa, bp, dmu_tx_get_txg(tx));
321 zil_free_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t claim_txg)
324 * If we previously claimed it, we need to free it.
326 if (claim_txg != 0 && lrc->lrc_txtype == TX_WRITE) {
327 lr_write_t *lr = (lr_write_t *)lrc;
328 blkptr_t *bp = &lr->lr_blkptr;
329 if (bp->blk_birth >= claim_txg &&
330 !zil_dva_tree_add(&zilog->zl_dva_tree, BP_IDENTITY(bp))) {
331 (void) arc_free(NULL, zilog->zl_spa,
332 dmu_tx_get_txg(tx), bp, NULL, NULL, ARC_WAIT);
338 * Create an on-disk intent log.
341 zil_create(zilog_t *zilog)
343 const zil_header_t *zh = zilog->zl_header;
351 * Wait for any previous destroy to complete.
353 txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg);
355 ASSERT(zh->zh_claim_txg == 0);
356 ASSERT(zh->zh_replay_seq == 0);
361 * If we don't already have an initial log block or we have one
362 * but it's the wrong endianness then allocate one.
364 if (BP_IS_HOLE(&blk) || BP_SHOULD_BYTESWAP(&blk)) {
365 tx = dmu_tx_create(zilog->zl_os);
366 (void) dmu_tx_assign(tx, TXG_WAIT);
367 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
368 txg = dmu_tx_get_txg(tx);
370 if (!BP_IS_HOLE(&blk)) {
371 zio_free_blk(zilog->zl_spa, &blk, txg);
375 error = zio_alloc_blk(zilog->zl_spa, ZIL_MIN_BLKSZ, &blk,
379 zil_init_log_chain(zilog, &blk);
383 * Allocate a log write buffer (lwb) for the first log block.
386 lwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP);
387 lwb->lwb_zilog = zilog;
390 lwb->lwb_sz = BP_GET_LSIZE(&lwb->lwb_blk);
391 lwb->lwb_buf = zio_buf_alloc(lwb->lwb_sz);
392 lwb->lwb_max_txg = txg;
395 mutex_enter(&zilog->zl_lock);
396 list_insert_tail(&zilog->zl_lwb_list, lwb);
397 mutex_exit(&zilog->zl_lock);
401 * If we just allocated the first log block, commit our transaction
402 * and wait for zil_sync() to stuff the block poiner into zh_log.
403 * (zh is part of the MOS, so we cannot modify it in open context.)
407 txg_wait_synced(zilog->zl_dmu_pool, txg);
410 ASSERT(bcmp(&blk, &zh->zh_log, sizeof (blk)) == 0);
414 * In one tx, free all log blocks and clear the log header.
415 * If keep_first is set, then we're replaying a log with no content.
416 * We want to keep the first block, however, so that the first
417 * synchronous transaction doesn't require a txg_wait_synced()
418 * in zil_create(). We don't need to txg_wait_synced() here either
419 * when keep_first is set, because both zil_create() and zil_destroy()
420 * will wait for any in-progress destroys to complete.
423 zil_destroy(zilog_t *zilog, boolean_t keep_first)
425 const zil_header_t *zh = zilog->zl_header;
431 * Wait for any previous destroy to complete.
433 txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg);
435 if (BP_IS_HOLE(&zh->zh_log))
438 tx = dmu_tx_create(zilog->zl_os);
439 (void) dmu_tx_assign(tx, TXG_WAIT);
440 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
441 txg = dmu_tx_get_txg(tx);
443 mutex_enter(&zilog->zl_lock);
446 * It is possible for the ZIL to get the previously mounted zilog
447 * structure of the same dataset if quickly remounted and the dbuf
448 * eviction has not completed. In this case we can see a non
449 * empty lwb list and keep_first will be set. We fix this by
450 * clearing the keep_first. This will be slower but it's very rare.
452 if (!list_is_empty(&zilog->zl_lwb_list) && keep_first)
453 keep_first = B_FALSE;
455 ASSERT3U(zilog->zl_destroy_txg, <, txg);
456 zilog->zl_destroy_txg = txg;
457 zilog->zl_keep_first = keep_first;
459 if (!list_is_empty(&zilog->zl_lwb_list)) {
460 ASSERT(zh->zh_claim_txg == 0);
462 while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) {
463 list_remove(&zilog->zl_lwb_list, lwb);
464 if (lwb->lwb_buf != NULL)
465 zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);
466 zio_free_blk(zilog->zl_spa, &lwb->lwb_blk, txg);
467 kmem_cache_free(zil_lwb_cache, lwb);
471 (void) zil_parse(zilog, zil_free_log_block,
472 zil_free_log_record, tx, zh->zh_claim_txg);
475 mutex_exit(&zilog->zl_lock);
481 * return true if the initial log block is not valid
484 zil_empty(zilog_t *zilog)
486 const zil_header_t *zh = zilog->zl_header;
487 arc_buf_t *abuf = NULL;
489 if (BP_IS_HOLE(&zh->zh_log))
492 if (zil_read_log_block(zilog, &zh->zh_log, &abuf) != 0)
495 VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1);
500 zil_claim(char *osname, void *txarg)
502 dmu_tx_t *tx = txarg;
503 uint64_t first_txg = dmu_tx_get_txg(tx);
509 error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
511 cmn_err(CE_WARN, "can't open objset for %s", osname);
515 zilog = dmu_objset_zil(os);
516 zh = zil_header_in_syncing_context(zilog);
519 * Record here whether the zil has any records to replay.
520 * If the header block pointer is null or the block points
521 * to the stubby then we know there are no valid log records.
522 * We use the header to store this state as the the zilog gets
523 * freed later in dmu_objset_close().
524 * The flags (and the rest of the header fields) are cleared in
525 * zil_sync() as a result of a zil_destroy(), after replaying the log.
527 * Note, the intent log can be empty but still need the
528 * stubby to be claimed.
530 if (!zil_empty(zilog))
531 zh->zh_flags |= ZIL_REPLAY_NEEDED;
534 * Claim all log blocks if we haven't already done so, and remember
535 * the highest claimed sequence number. This ensures that if we can
536 * read only part of the log now (e.g. due to a missing device),
537 * but we can read the entire log later, we will not try to replay
538 * or destroy beyond the last block we successfully claimed.
540 ASSERT3U(zh->zh_claim_txg, <=, first_txg);
541 if (zh->zh_claim_txg == 0 && !BP_IS_HOLE(&zh->zh_log)) {
542 zh->zh_claim_txg = first_txg;
543 zh->zh_claim_seq = zil_parse(zilog, zil_claim_log_block,
544 zil_claim_log_record, tx, first_txg);
545 dsl_dataset_dirty(dmu_objset_ds(os), tx);
548 ASSERT3U(first_txg, ==, (spa_last_synced_txg(zilog->zl_spa) + 1));
549 dmu_objset_close(os);
554 * Check the log by walking the log chain.
555 * Checksum errors are ok as they indicate the end of the chain.
556 * Any other error (no device or read failure) returns an error.
560 zil_check_log_chain(char *osname, void *txarg)
571 error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
573 cmn_err(CE_WARN, "can't open objset for %s", osname);
577 zilog = dmu_objset_zil(os);
578 zh = zil_header_in_syncing_context(zilog);
580 if (BP_IS_HOLE(&blk)) {
581 dmu_objset_close(os);
582 return (0); /* no chain */
586 error = zil_read_log_block(zilog, &blk, &abuf);
589 lrbuf = abuf->b_data;
590 ztp = (zil_trailer_t *)(lrbuf + BP_GET_LSIZE(&blk)) - 1;
591 blk = ztp->zit_next_blk;
592 VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1);
594 dmu_objset_close(os);
596 return (0); /* normal end of chain */
605 zil_clear_log_chain(char *osname, void *txarg)
613 error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
615 cmn_err(CE_WARN, "can't open objset for %s", osname);
619 zilog = dmu_objset_zil(os);
620 tx = dmu_tx_create(zilog->zl_os);
621 (void) dmu_tx_assign(tx, TXG_WAIT);
622 zh = zil_header_in_syncing_context(zilog);
623 BP_ZERO(&zh->zh_log);
624 dsl_dataset_dirty(dmu_objset_ds(os), tx);
626 dmu_objset_close(os);
631 zil_vdev_compare(const void *x1, const void *x2)
633 uint64_t v1 = ((zil_vdev_node_t *)x1)->zv_vdev;
634 uint64_t v2 = ((zil_vdev_node_t *)x2)->zv_vdev;
645 zil_add_block(zilog_t *zilog, blkptr_t *bp)
647 avl_tree_t *t = &zilog->zl_vdev_tree;
649 zil_vdev_node_t *zv, zvsearch;
650 int ndvas = BP_GET_NDVAS(bp);
653 if (zfs_nocacheflush)
656 ASSERT(zilog->zl_writer);
659 * Even though we're zl_writer, we still need a lock because the
660 * zl_get_data() callbacks may have dmu_sync() done callbacks
661 * that will run concurrently.
663 mutex_enter(&zilog->zl_vdev_lock);
664 for (i = 0; i < ndvas; i++) {
665 zvsearch.zv_vdev = DVA_GET_VDEV(&bp->blk_dva[i]);
666 if (avl_find(t, &zvsearch, &where) == NULL) {
667 zv = kmem_alloc(sizeof (*zv), KM_SLEEP);
668 zv->zv_vdev = zvsearch.zv_vdev;
669 avl_insert(t, zv, where);
672 mutex_exit(&zilog->zl_vdev_lock);
676 zil_flush_vdevs(zilog_t *zilog)
678 spa_t *spa = zilog->zl_spa;
679 avl_tree_t *t = &zilog->zl_vdev_tree;
684 ASSERT(zilog->zl_writer);
687 * We don't need zl_vdev_lock here because we're the zl_writer,
688 * and all zl_get_data() callbacks are done.
690 if (avl_numnodes(t) == 0)
693 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
695 zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL);
697 while ((zv = avl_destroy_nodes(t, &cookie)) != NULL) {
698 vdev_t *vd = vdev_lookup_top(spa, zv->zv_vdev);
701 kmem_free(zv, sizeof (*zv));
705 * Wait for all the flushes to complete. Not all devices actually
706 * support the DKIOCFLUSHWRITECACHE ioctl, so it's OK if it fails.
708 (void) zio_wait(zio);
710 spa_config_exit(spa, SCL_STATE, FTAG);
714 * Function called when a log block write completes
717 zil_lwb_write_done(zio_t *zio)
719 lwb_t *lwb = zio->io_private;
720 zilog_t *zilog = lwb->lwb_zilog;
722 ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF);
723 ASSERT(BP_GET_CHECKSUM(zio->io_bp) == ZIO_CHECKSUM_ZILOG);
724 ASSERT(BP_GET_TYPE(zio->io_bp) == DMU_OT_INTENT_LOG);
725 ASSERT(BP_GET_LEVEL(zio->io_bp) == 0);
726 ASSERT(BP_GET_BYTEORDER(zio->io_bp) == ZFS_HOST_BYTEORDER);
727 ASSERT(!BP_IS_GANG(zio->io_bp));
728 ASSERT(!BP_IS_HOLE(zio->io_bp));
729 ASSERT(zio->io_bp->blk_fill == 0);
732 * Ensure the lwb buffer pointer is cleared before releasing
733 * the txg. If we have had an allocation failure and
734 * the txg is waiting to sync then we want want zil_sync()
735 * to remove the lwb so that it's not picked up as the next new
736 * one in zil_commit_writer(). zil_sync() will only remove
737 * the lwb if lwb_buf is null.
739 zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);
740 mutex_enter(&zilog->zl_lock);
743 zilog->zl_log_error = B_TRUE;
746 * Now that we've written this log block, we have a stable pointer
747 * to the next block in the chain, so it's OK to let the txg in
748 * which we allocated the next block sync. We still have the
749 * zl_lock to ensure zil_sync doesn't kmem free the lwb.
751 txg_rele_to_sync(&lwb->lwb_txgh);
752 mutex_exit(&zilog->zl_lock);
756 * Initialize the io for a log block.
759 zil_lwb_write_init(zilog_t *zilog, lwb_t *lwb)
763 zb.zb_objset = lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_OBJSET];
766 zb.zb_blkid = lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_SEQ];
768 if (zilog->zl_root_zio == NULL) {
769 zilog->zl_root_zio = zio_root(zilog->zl_spa, NULL, NULL,
772 if (lwb->lwb_zio == NULL) {
773 lwb->lwb_zio = zio_rewrite(zilog->zl_root_zio, zilog->zl_spa,
774 0, &lwb->lwb_blk, lwb->lwb_buf,
775 lwb->lwb_sz, zil_lwb_write_done, lwb,
776 ZIO_PRIORITY_LOG_WRITE, ZIO_FLAG_CANFAIL, &zb);
781 * Start a log block write and advance to the next log block.
782 * Calls are serialized.
785 zil_lwb_write_start(zilog_t *zilog, lwb_t *lwb)
788 zil_trailer_t *ztp = (zil_trailer_t *)(lwb->lwb_buf + lwb->lwb_sz) - 1;
789 spa_t *spa = zilog->zl_spa;
790 blkptr_t *bp = &ztp->zit_next_blk;
795 ASSERT(lwb->lwb_nused <= ZIL_BLK_DATA_SZ(lwb));
798 * Allocate the next block and save its address in this block
799 * before writing it in order to establish the log chain.
800 * Note that if the allocation of nlwb synced before we wrote
801 * the block that points at it (lwb), we'd leak it if we crashed.
802 * Therefore, we don't do txg_rele_to_sync() until zil_lwb_write_done().
804 txg = txg_hold_open(zilog->zl_dmu_pool, &lwb->lwb_txgh);
805 txg_rele_to_quiesce(&lwb->lwb_txgh);
808 * Pick a ZIL blocksize. We request a size that is the
809 * maximum of the previous used size, the current used size and
810 * the amount waiting in the queue.
812 zil_blksz = MAX(zilog->zl_prev_used,
813 zilog->zl_cur_used + sizeof (*ztp));
814 zil_blksz = MAX(zil_blksz, zilog->zl_itx_list_sz + sizeof (*ztp));
815 zil_blksz = P2ROUNDUP_TYPED(zil_blksz, ZIL_MIN_BLKSZ, uint64_t);
816 if (zil_blksz > ZIL_MAX_BLKSZ)
817 zil_blksz = ZIL_MAX_BLKSZ;
820 /* pass the old blkptr in order to spread log blocks across devs */
821 error = zio_alloc_blk(spa, zil_blksz, bp, &lwb->lwb_blk, txg);
823 dmu_tx_t *tx = dmu_tx_create_assigned(zilog->zl_dmu_pool, txg);
826 * We dirty the dataset to ensure that zil_sync() will
827 * be called to remove this lwb from our zl_lwb_list.
828 * Failing to do so, may leave an lwb with a NULL lwb_buf
829 * hanging around on the zl_lwb_list.
831 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
835 * Since we've just experienced an allocation failure so we
836 * terminate the current lwb and send it on its way.
839 ztp->zit_nused = lwb->lwb_nused;
840 ztp->zit_bt.zbt_cksum = lwb->lwb_blk.blk_cksum;
841 zio_nowait(lwb->lwb_zio);
844 * By returning NULL the caller will call tx_wait_synced()
849 ASSERT3U(bp->blk_birth, ==, txg);
851 ztp->zit_nused = lwb->lwb_nused;
852 ztp->zit_bt.zbt_cksum = lwb->lwb_blk.blk_cksum;
853 bp->blk_cksum = lwb->lwb_blk.blk_cksum;
854 bp->blk_cksum.zc_word[ZIL_ZC_SEQ]++;
857 * Allocate a new log write buffer (lwb).
859 nlwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP);
861 nlwb->lwb_zilog = zilog;
864 nlwb->lwb_sz = BP_GET_LSIZE(&nlwb->lwb_blk);
865 nlwb->lwb_buf = zio_buf_alloc(nlwb->lwb_sz);
866 nlwb->lwb_max_txg = txg;
867 nlwb->lwb_zio = NULL;
870 * Put new lwb at the end of the log chain
872 mutex_enter(&zilog->zl_lock);
873 list_insert_tail(&zilog->zl_lwb_list, nlwb);
874 mutex_exit(&zilog->zl_lock);
876 /* Record the block for later vdev flushing */
877 zil_add_block(zilog, &lwb->lwb_blk);
880 * kick off the write for the old log block
882 dprintf_bp(&lwb->lwb_blk, "lwb %p txg %llu: ", lwb, txg);
883 ASSERT(lwb->lwb_zio);
884 zio_nowait(lwb->lwb_zio);
890 zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb)
892 lr_t *lrc = &itx->itx_lr; /* common log record */
893 lr_write_t *lr = (lr_write_t *)lrc;
894 uint64_t txg = lrc->lrc_txg;
895 uint64_t reclen = lrc->lrc_reclen;
900 ASSERT(lwb->lwb_buf != NULL);
902 if (lrc->lrc_txtype == TX_WRITE && itx->itx_wr_state == WR_NEED_COPY)
903 dlen = P2ROUNDUP_TYPED(
904 lr->lr_length, sizeof (uint64_t), uint64_t);
908 zilog->zl_cur_used += (reclen + dlen);
910 zil_lwb_write_init(zilog, lwb);
913 * If this record won't fit in the current log block, start a new one.
915 if (lwb->lwb_nused + reclen + dlen > ZIL_BLK_DATA_SZ(lwb)) {
916 lwb = zil_lwb_write_start(zilog, lwb);
919 zil_lwb_write_init(zilog, lwb);
920 ASSERT(lwb->lwb_nused == 0);
921 if (reclen + dlen > ZIL_BLK_DATA_SZ(lwb)) {
922 txg_wait_synced(zilog->zl_dmu_pool, txg);
928 * Update the lrc_seq, to be log record sequence number. See zil.h
929 * Then copy the record to the log buffer.
931 lrc->lrc_seq = ++zilog->zl_lr_seq; /* we are single threaded */
932 bcopy(lrc, lwb->lwb_buf + lwb->lwb_nused, reclen);
935 * If it's a write, fetch the data or get its blkptr as appropriate.
937 if (lrc->lrc_txtype == TX_WRITE) {
938 if (txg > spa_freeze_txg(zilog->zl_spa))
939 txg_wait_synced(zilog->zl_dmu_pool, txg);
940 if (itx->itx_wr_state != WR_COPIED) {
944 /* alignment is guaranteed */
945 lr = (lr_write_t *)(lwb->lwb_buf + lwb->lwb_nused);
947 ASSERT(itx->itx_wr_state == WR_NEED_COPY);
948 dbuf = lwb->lwb_buf + lwb->lwb_nused + reclen;
949 lr->lr_common.lrc_reclen += dlen;
951 ASSERT(itx->itx_wr_state == WR_INDIRECT);
954 error = zilog->zl_get_data(
955 itx->itx_private, lr, dbuf, lwb->lwb_zio);
957 ASSERT(error == ENOENT || error == EEXIST ||
964 lwb->lwb_nused += reclen + dlen;
965 lwb->lwb_max_txg = MAX(lwb->lwb_max_txg, txg);
966 ASSERT3U(lwb->lwb_nused, <=, ZIL_BLK_DATA_SZ(lwb));
967 ASSERT3U(P2PHASE(lwb->lwb_nused, sizeof (uint64_t)), ==, 0);
973 zil_itx_create(uint64_t txtype, size_t lrsize)
977 lrsize = P2ROUNDUP_TYPED(lrsize, sizeof (uint64_t), size_t);
979 itx = kmem_alloc(offsetof(itx_t, itx_lr) + lrsize, KM_SLEEP);
980 itx->itx_lr.lrc_txtype = txtype;
981 itx->itx_lr.lrc_reclen = lrsize;
982 itx->itx_sod = lrsize; /* if write & WR_NEED_COPY will be increased */
983 itx->itx_lr.lrc_seq = 0; /* defensive */
989 zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx)
993 ASSERT(itx->itx_lr.lrc_seq == 0);
995 mutex_enter(&zilog->zl_lock);
996 list_insert_tail(&zilog->zl_itx_list, itx);
997 zilog->zl_itx_list_sz += itx->itx_sod;
998 itx->itx_lr.lrc_txg = dmu_tx_get_txg(tx);
999 itx->itx_lr.lrc_seq = seq = ++zilog->zl_itx_seq;
1000 mutex_exit(&zilog->zl_lock);
1006 * Free up all in-memory intent log transactions that have now been synced.
1009 zil_itx_clean(zilog_t *zilog)
1011 uint64_t synced_txg = spa_last_synced_txg(zilog->zl_spa);
1012 uint64_t freeze_txg = spa_freeze_txg(zilog->zl_spa);
1016 list_create(&clean_list, sizeof (itx_t), offsetof(itx_t, itx_node));
1018 mutex_enter(&zilog->zl_lock);
1019 /* wait for a log writer to finish walking list */
1020 while (zilog->zl_writer) {
1021 cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock);
1025 * Move the sync'd log transactions to a separate list so we can call
1026 * kmem_free without holding the zl_lock.
1028 * There is no need to set zl_writer as we don't drop zl_lock here
1030 while ((itx = list_head(&zilog->zl_itx_list)) != NULL &&
1031 itx->itx_lr.lrc_txg <= MIN(synced_txg, freeze_txg)) {
1032 list_remove(&zilog->zl_itx_list, itx);
1033 zilog->zl_itx_list_sz -= itx->itx_sod;
1034 list_insert_tail(&clean_list, itx);
1036 cv_broadcast(&zilog->zl_cv_writer);
1037 mutex_exit(&zilog->zl_lock);
1039 /* destroy sync'd log transactions */
1040 while ((itx = list_head(&clean_list)) != NULL) {
1041 list_remove(&clean_list, itx);
1042 kmem_free(itx, offsetof(itx_t, itx_lr)
1043 + itx->itx_lr.lrc_reclen);
1045 list_destroy(&clean_list);
1049 * If there are any in-memory intent log transactions which have now been
1050 * synced then start up a taskq to free them.
1053 zil_clean(zilog_t *zilog)
1057 mutex_enter(&zilog->zl_lock);
1058 itx = list_head(&zilog->zl_itx_list);
1059 if ((itx != NULL) &&
1060 (itx->itx_lr.lrc_txg <= spa_last_synced_txg(zilog->zl_spa))) {
1061 (void) taskq_dispatch(zilog->zl_clean_taskq,
1062 (task_func_t *)zil_itx_clean, zilog, TQ_SLEEP);
1064 mutex_exit(&zilog->zl_lock);
1068 zil_commit_writer(zilog_t *zilog, uint64_t seq, uint64_t foid)
1071 uint64_t commit_seq = 0;
1072 itx_t *itx, *itx_next = (itx_t *)-1;
1076 zilog->zl_writer = B_TRUE;
1077 ASSERT(zilog->zl_root_zio == NULL);
1078 spa = zilog->zl_spa;
1080 if (zilog->zl_suspend) {
1083 lwb = list_tail(&zilog->zl_lwb_list);
1086 * Return if there's nothing to flush before we
1087 * dirty the fs by calling zil_create()
1089 if (list_is_empty(&zilog->zl_itx_list)) {
1090 zilog->zl_writer = B_FALSE;
1093 mutex_exit(&zilog->zl_lock);
1095 mutex_enter(&zilog->zl_lock);
1096 lwb = list_tail(&zilog->zl_lwb_list);
1100 /* Loop through in-memory log transactions filling log blocks. */
1101 DTRACE_PROBE1(zil__cw1, zilog_t *, zilog);
1104 * Find the next itx to push:
1105 * Push all transactions related to specified foid and all
1106 * other transactions except TX_WRITE, TX_TRUNCATE,
1107 * TX_SETATTR and TX_ACL for all other files.
1109 if (itx_next != (itx_t *)-1)
1112 itx = list_head(&zilog->zl_itx_list);
1113 for (; itx != NULL; itx = list_next(&zilog->zl_itx_list, itx)) {
1114 if (foid == 0) /* push all foids? */
1116 if (itx->itx_sync) /* push all O_[D]SYNC */
1118 switch (itx->itx_lr.lrc_txtype) {
1123 /* lr_foid is same offset for these records */
1124 if (((lr_write_t *)&itx->itx_lr)->lr_foid
1126 continue; /* skip this record */
1134 if ((itx->itx_lr.lrc_seq > seq) &&
1135 ((lwb == NULL) || (lwb->lwb_nused == 0) ||
1136 (lwb->lwb_nused + itx->itx_sod > ZIL_BLK_DATA_SZ(lwb)))) {
1141 * Save the next pointer. Even though we soon drop
1142 * zl_lock all threads that may change the list
1143 * (another writer or zil_itx_clean) can't do so until
1144 * they have zl_writer.
1146 itx_next = list_next(&zilog->zl_itx_list, itx);
1147 list_remove(&zilog->zl_itx_list, itx);
1148 zilog->zl_itx_list_sz -= itx->itx_sod;
1149 mutex_exit(&zilog->zl_lock);
1150 txg = itx->itx_lr.lrc_txg;
1153 if (txg > spa_last_synced_txg(spa) ||
1154 txg > spa_freeze_txg(spa))
1155 lwb = zil_lwb_commit(zilog, itx, lwb);
1156 kmem_free(itx, offsetof(itx_t, itx_lr)
1157 + itx->itx_lr.lrc_reclen);
1158 mutex_enter(&zilog->zl_lock);
1160 DTRACE_PROBE1(zil__cw2, zilog_t *, zilog);
1161 /* determine commit sequence number */
1162 itx = list_head(&zilog->zl_itx_list);
1164 commit_seq = itx->itx_lr.lrc_seq;
1166 commit_seq = zilog->zl_itx_seq;
1167 mutex_exit(&zilog->zl_lock);
1169 /* write the last block out */
1170 if (lwb != NULL && lwb->lwb_zio != NULL)
1171 lwb = zil_lwb_write_start(zilog, lwb);
1173 zilog->zl_prev_used = zilog->zl_cur_used;
1174 zilog->zl_cur_used = 0;
1177 * Wait if necessary for the log blocks to be on stable storage.
1179 if (zilog->zl_root_zio) {
1180 DTRACE_PROBE1(zil__cw3, zilog_t *, zilog);
1181 (void) zio_wait(zilog->zl_root_zio);
1182 zilog->zl_root_zio = NULL;
1183 DTRACE_PROBE1(zil__cw4, zilog_t *, zilog);
1184 zil_flush_vdevs(zilog);
1187 if (zilog->zl_log_error || lwb == NULL) {
1188 zilog->zl_log_error = 0;
1189 txg_wait_synced(zilog->zl_dmu_pool, 0);
1192 mutex_enter(&zilog->zl_lock);
1193 zilog->zl_writer = B_FALSE;
1195 ASSERT3U(commit_seq, >=, zilog->zl_commit_seq);
1196 zilog->zl_commit_seq = commit_seq;
1200 * Push zfs transactions to stable storage up to the supplied sequence number.
1201 * If foid is 0 push out all transactions, otherwise push only those
1202 * for that file or might have been used to create that file.
1205 zil_commit(zilog_t *zilog, uint64_t seq, uint64_t foid)
1207 if (zilog == NULL || seq == 0)
1210 mutex_enter(&zilog->zl_lock);
1212 seq = MIN(seq, zilog->zl_itx_seq); /* cap seq at largest itx seq */
1214 while (zilog->zl_writer) {
1215 cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock);
1216 if (seq < zilog->zl_commit_seq) {
1217 mutex_exit(&zilog->zl_lock);
1221 zil_commit_writer(zilog, seq, foid); /* drops zl_lock */
1222 /* wake up others waiting on the commit */
1223 cv_broadcast(&zilog->zl_cv_writer);
1224 mutex_exit(&zilog->zl_lock);
1228 * Called in syncing context to free committed log blocks and update log header.
1231 zil_sync(zilog_t *zilog, dmu_tx_t *tx)
1233 zil_header_t *zh = zil_header_in_syncing_context(zilog);
1234 uint64_t txg = dmu_tx_get_txg(tx);
1235 spa_t *spa = zilog->zl_spa;
1239 * We don't zero out zl_destroy_txg, so make sure we don't try
1240 * to destroy it twice.
1242 if (spa_sync_pass(spa) != 1)
1245 mutex_enter(&zilog->zl_lock);
1247 ASSERT(zilog->zl_stop_sync == 0);
1249 zh->zh_replay_seq = zilog->zl_replayed_seq[txg & TXG_MASK];
1251 if (zilog->zl_destroy_txg == txg) {
1252 blkptr_t blk = zh->zh_log;
1254 ASSERT(list_head(&zilog->zl_lwb_list) == NULL);
1256 bzero(zh, sizeof (zil_header_t));
1257 bzero(zilog->zl_replayed_seq, sizeof (zilog->zl_replayed_seq));
1259 if (zilog->zl_keep_first) {
1261 * If this block was part of log chain that couldn't
1262 * be claimed because a device was missing during
1263 * zil_claim(), but that device later returns,
1264 * then this block could erroneously appear valid.
1265 * To guard against this, assign a new GUID to the new
1266 * log chain so it doesn't matter what blk points to.
1268 zil_init_log_chain(zilog, &blk);
1274 lwb = list_head(&zilog->zl_lwb_list);
1276 mutex_exit(&zilog->zl_lock);
1279 zh->zh_log = lwb->lwb_blk;
1280 if (lwb->lwb_buf != NULL || lwb->lwb_max_txg > txg)
1282 list_remove(&zilog->zl_lwb_list, lwb);
1283 zio_free_blk(spa, &lwb->lwb_blk, txg);
1284 kmem_cache_free(zil_lwb_cache, lwb);
1287 * If we don't have anything left in the lwb list then
1288 * we've had an allocation failure and we need to zero
1289 * out the zil_header blkptr so that we don't end
1290 * up freeing the same block twice.
1292 if (list_head(&zilog->zl_lwb_list) == NULL)
1293 BP_ZERO(&zh->zh_log);
1295 mutex_exit(&zilog->zl_lock);
1301 zil_lwb_cache = kmem_cache_create("zil_lwb_cache",
1302 sizeof (struct lwb), 0, NULL, NULL, NULL, NULL, NULL, 0);
1308 kmem_cache_destroy(zil_lwb_cache);
1312 zil_alloc(objset_t *os, zil_header_t *zh_phys)
1316 zilog = kmem_zalloc(sizeof (zilog_t), KM_SLEEP);
1318 zilog->zl_header = zh_phys;
1320 zilog->zl_spa = dmu_objset_spa(os);
1321 zilog->zl_dmu_pool = dmu_objset_pool(os);
1322 zilog->zl_destroy_txg = TXG_INITIAL - 1;
1324 mutex_init(&zilog->zl_lock, NULL, MUTEX_DEFAULT, NULL);
1326 list_create(&zilog->zl_itx_list, sizeof (itx_t),
1327 offsetof(itx_t, itx_node));
1329 list_create(&zilog->zl_lwb_list, sizeof (lwb_t),
1330 offsetof(lwb_t, lwb_node));
1332 mutex_init(&zilog->zl_vdev_lock, NULL, MUTEX_DEFAULT, NULL);
1334 avl_create(&zilog->zl_vdev_tree, zil_vdev_compare,
1335 sizeof (zil_vdev_node_t), offsetof(zil_vdev_node_t, zv_node));
1337 cv_init(&zilog->zl_cv_writer, NULL, CV_DEFAULT, NULL);
1338 cv_init(&zilog->zl_cv_suspend, NULL, CV_DEFAULT, NULL);
1344 zil_free(zilog_t *zilog)
1348 zilog->zl_stop_sync = 1;
1350 while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) {
1351 list_remove(&zilog->zl_lwb_list, lwb);
1352 if (lwb->lwb_buf != NULL)
1353 zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);
1354 kmem_cache_free(zil_lwb_cache, lwb);
1356 list_destroy(&zilog->zl_lwb_list);
1358 avl_destroy(&zilog->zl_vdev_tree);
1359 mutex_destroy(&zilog->zl_vdev_lock);
1361 ASSERT(list_head(&zilog->zl_itx_list) == NULL);
1362 list_destroy(&zilog->zl_itx_list);
1363 mutex_destroy(&zilog->zl_lock);
1365 cv_destroy(&zilog->zl_cv_writer);
1366 cv_destroy(&zilog->zl_cv_suspend);
1368 kmem_free(zilog, sizeof (zilog_t));
1372 * Open an intent log.
1375 zil_open(objset_t *os, zil_get_data_t *get_data)
1377 zilog_t *zilog = dmu_objset_zil(os);
1379 zilog->zl_get_data = get_data;
1380 zilog->zl_clean_taskq = taskq_create("zil_clean", 1, minclsyspri,
1381 2, 2, TASKQ_PREPOPULATE);
1387 * Close an intent log.
1390 zil_close(zilog_t *zilog)
1393 * If the log isn't already committed, mark the objset dirty
1394 * (so zil_sync() will be called) and wait for that txg to sync.
1396 if (!zil_is_committed(zilog)) {
1398 dmu_tx_t *tx = dmu_tx_create(zilog->zl_os);
1399 (void) dmu_tx_assign(tx, TXG_WAIT);
1400 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
1401 txg = dmu_tx_get_txg(tx);
1403 txg_wait_synced(zilog->zl_dmu_pool, txg);
1406 taskq_destroy(zilog->zl_clean_taskq);
1407 zilog->zl_clean_taskq = NULL;
1408 zilog->zl_get_data = NULL;
1410 zil_itx_clean(zilog);
1411 ASSERT(list_head(&zilog->zl_itx_list) == NULL);
1415 * Suspend an intent log. While in suspended mode, we still honor
1416 * synchronous semantics, but we rely on txg_wait_synced() to do it.
1417 * We suspend the log briefly when taking a snapshot so that the snapshot
1418 * contains all the data it's supposed to, and has an empty intent log.
1421 zil_suspend(zilog_t *zilog)
1423 const zil_header_t *zh = zilog->zl_header;
1425 mutex_enter(&zilog->zl_lock);
1426 if (zh->zh_flags & ZIL_REPLAY_NEEDED) { /* unplayed log */
1427 mutex_exit(&zilog->zl_lock);
1430 if (zilog->zl_suspend++ != 0) {
1432 * Someone else already began a suspend.
1433 * Just wait for them to finish.
1435 while (zilog->zl_suspending)
1436 cv_wait(&zilog->zl_cv_suspend, &zilog->zl_lock);
1437 mutex_exit(&zilog->zl_lock);
1440 zilog->zl_suspending = B_TRUE;
1441 mutex_exit(&zilog->zl_lock);
1443 zil_commit(zilog, UINT64_MAX, 0);
1446 * Wait for any in-flight log writes to complete.
1448 mutex_enter(&zilog->zl_lock);
1449 while (zilog->zl_writer)
1450 cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock);
1451 mutex_exit(&zilog->zl_lock);
1453 zil_destroy(zilog, B_FALSE);
1455 mutex_enter(&zilog->zl_lock);
1456 zilog->zl_suspending = B_FALSE;
1457 cv_broadcast(&zilog->zl_cv_suspend);
1458 mutex_exit(&zilog->zl_lock);
1464 zil_resume(zilog_t *zilog)
1466 mutex_enter(&zilog->zl_lock);
1467 ASSERT(zilog->zl_suspend != 0);
1468 zilog->zl_suspend--;
1469 mutex_exit(&zilog->zl_lock);
1473 * Read in the data for the dmu_sync()ed block, and change the log
1474 * record to write this whole block.
1477 zil_get_replay_data(zilog_t *zilog, lr_write_t *lr)
1479 blkptr_t *wbp = &lr->lr_blkptr;
1480 char *wbuf = (char *)(lr + 1); /* data follows lr_write_t */
1483 if (BP_IS_HOLE(wbp)) { /* compressed to a hole */
1484 blksz = BP_GET_LSIZE(&lr->lr_blkptr);
1486 * If the blksz is zero then we must be replaying a log
1487 * from an version prior to setting the blksize of null blocks.
1488 * So we just zero the actual write size reqeusted.
1491 bzero(wbuf, lr->lr_length);
1497 * A subsequent write may have overwritten this block, in which
1498 * case wbp may have been been freed and reallocated, and our
1499 * read of wbp may fail with a checksum error. We can safely
1500 * ignore this because the later write will provide the
1505 zb.zb_objset = dmu_objset_id(zilog->zl_os);
1506 zb.zb_object = lr->lr_foid;
1508 zb.zb_blkid = -1; /* unknown */
1510 blksz = BP_GET_LSIZE(&lr->lr_blkptr);
1511 (void) zio_wait(zio_read(NULL, zilog->zl_spa, wbp, wbuf, blksz,
1512 NULL, NULL, ZIO_PRIORITY_SYNC_READ,
1513 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &zb));
1515 lr->lr_offset -= lr->lr_offset % blksz;
1516 lr->lr_length = blksz;
1519 typedef struct zil_replay_arg {
1521 zil_replay_func_t **zr_replay;
1523 boolean_t zr_byteswap;
1528 zil_replay_log_record(zilog_t *zilog, lr_t *lr, void *zra, uint64_t claim_txg)
1530 zil_replay_arg_t *zr = zra;
1531 const zil_header_t *zh = zilog->zl_header;
1532 uint64_t reclen = lr->lrc_reclen;
1533 uint64_t txtype = lr->lrc_txtype;
1537 if (!zilog->zl_replay) /* giving up */
1540 if (lr->lrc_txg < claim_txg) /* already committed */
1543 if (lr->lrc_seq <= zh->zh_replay_seq) /* already replayed */
1546 /* Strip case-insensitive bit, still present in log record */
1549 if (txtype == 0 || txtype >= TX_MAX_TYPE) {
1555 * Make a copy of the data so we can revise and extend it.
1557 bcopy(lr, zr->zr_lrbuf, reclen);
1560 * The log block containing this lr may have been byteswapped
1561 * so that we can easily examine common fields like lrc_txtype.
1562 * However, the log is a mix of different data types, and only the
1563 * replay vectors know how to byteswap their records. Therefore, if
1564 * the lr was byteswapped, undo it before invoking the replay vector.
1566 if (zr->zr_byteswap)
1567 byteswap_uint64_array(zr->zr_lrbuf, reclen);
1570 * We must now do two things atomically: replay this log record,
1571 * and update the log header sequence number to reflect the fact that
1572 * we did so. At the end of each replay function the sequence number
1573 * is updated if we are in replay mode.
1575 for (pass = 1; pass <= 2; pass++) {
1576 zilog->zl_replaying_seq = lr->lrc_seq;
1577 /* Only byteswap (if needed) on the 1st pass. */
1578 error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lrbuf,
1579 zr->zr_byteswap && pass == 1);
1585 * The DMU's dnode layer doesn't see removes until the txg
1586 * commits, so a subsequent claim can spuriously fail with
1587 * EEXIST. So if we receive any error we try syncing out
1588 * any removes then retry the transaction.
1591 txg_wait_synced(spa_get_dsl(zilog->zl_spa), 0);
1596 name = kmem_alloc(MAXNAMELEN, KM_SLEEP);
1597 dmu_objset_name(zr->zr_os, name);
1598 cmn_err(CE_WARN, "ZFS replay transaction error %d, "
1599 "dataset %s, seq 0x%llx, txtype %llu %s\n",
1600 error, name, (u_longlong_t)lr->lrc_seq, (u_longlong_t)txtype,
1601 (lr->lrc_txtype & TX_CI) ? "CI" : "");
1602 zilog->zl_replay = B_FALSE;
1603 kmem_free(name, MAXNAMELEN);
1608 zil_incr_blks(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
1610 zilog->zl_replay_blks++;
1614 * If this dataset has a non-empty intent log, replay it and destroy it.
1617 zil_replay(objset_t *os, void *arg, zil_replay_func_t *replay_func[TX_MAX_TYPE])
1619 zilog_t *zilog = dmu_objset_zil(os);
1620 const zil_header_t *zh = zilog->zl_header;
1621 zil_replay_arg_t zr;
1623 if ((zh->zh_flags & ZIL_REPLAY_NEEDED) == 0) {
1624 zil_destroy(zilog, B_TRUE);
1627 //printf("ZFS: Replaying ZIL on %s...\n", os->os->os_spa->spa_name);
1630 zr.zr_replay = replay_func;
1632 zr.zr_byteswap = BP_SHOULD_BYTESWAP(&zh->zh_log);
1633 zr.zr_lrbuf = kmem_alloc(2 * SPA_MAXBLOCKSIZE, KM_SLEEP);
1636 * Wait for in-progress removes to sync before starting replay.
1638 txg_wait_synced(zilog->zl_dmu_pool, 0);
1640 zilog->zl_replay = B_TRUE;
1641 zilog->zl_replay_time = LBOLT;
1642 ASSERT(zilog->zl_replay_blks == 0);
1643 (void) zil_parse(zilog, zil_incr_blks, zil_replay_log_record, &zr,
1645 kmem_free(zr.zr_lrbuf, 2 * SPA_MAXBLOCKSIZE);
1647 zil_destroy(zilog, B_FALSE);
1648 txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg);
1649 zilog->zl_replay = B_FALSE;
1650 //printf("ZFS: Replay of ZIL on %s finished.\n", os->os->os_spa->spa_name);
1654 * Report whether all transactions are committed
1657 zil_is_committed(zilog_t *zilog)
1662 mutex_enter(&zilog->zl_lock);
1663 while (zilog->zl_writer)
1664 cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock);
1666 /* recent unpushed intent log transactions? */
1667 if (!list_is_empty(&zilog->zl_itx_list)) {
1672 /* intent log never used? */
1673 lwb = list_head(&zilog->zl_lwb_list);
1680 * more than 1 log buffer means zil_sync() hasn't yet freed
1681 * entries after a txg has committed
1683 if (list_next(&zilog->zl_lwb_list, lwb)) {
1688 ASSERT(zil_empty(zilog));
1691 cv_broadcast(&zilog->zl_cv_writer);
1692 mutex_exit(&zilog->zl_lock);