4 * The contents of this file are subject to the terms of the
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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
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15 * If applicable, add the following below this CDDL HEADER, with the
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22 * Copyright 2008 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 */
71 * Tunable parameter for debugging or performance analysis. Setting
72 * zfs_nocacheflush will cause corruption on power loss if a volatile
73 * out-of-order write cache is enabled.
75 boolean_t zfs_nocacheflush = B_FALSE;
77 static kmem_cache_t *zil_lwb_cache;
80 zil_dva_compare(const void *x1, const void *x2)
82 const dva_t *dva1 = x1;
83 const dva_t *dva2 = x2;
85 if (DVA_GET_VDEV(dva1) < DVA_GET_VDEV(dva2))
87 if (DVA_GET_VDEV(dva1) > DVA_GET_VDEV(dva2))
90 if (DVA_GET_OFFSET(dva1) < DVA_GET_OFFSET(dva2))
92 if (DVA_GET_OFFSET(dva1) > DVA_GET_OFFSET(dva2))
99 zil_dva_tree_init(avl_tree_t *t)
101 avl_create(t, zil_dva_compare, sizeof (zil_dva_node_t),
102 offsetof(zil_dva_node_t, zn_node));
106 zil_dva_tree_fini(avl_tree_t *t)
111 while ((zn = avl_destroy_nodes(t, &cookie)) != NULL)
112 kmem_free(zn, sizeof (zil_dva_node_t));
118 zil_dva_tree_add(avl_tree_t *t, dva_t *dva)
123 if (avl_find(t, dva, &where) != NULL)
126 zn = kmem_alloc(sizeof (zil_dva_node_t), KM_SLEEP);
128 avl_insert(t, zn, where);
133 static zil_header_t *
134 zil_header_in_syncing_context(zilog_t *zilog)
136 return ((zil_header_t *)zilog->zl_header);
140 zil_init_log_chain(zilog_t *zilog, blkptr_t *bp)
142 zio_cksum_t *zc = &bp->blk_cksum;
144 zc->zc_word[ZIL_ZC_GUID_0] = spa_get_random(-1ULL);
145 zc->zc_word[ZIL_ZC_GUID_1] = spa_get_random(-1ULL);
146 zc->zc_word[ZIL_ZC_OBJSET] = dmu_objset_id(zilog->zl_os);
147 zc->zc_word[ZIL_ZC_SEQ] = 1ULL;
151 * Read a log block, make sure it's valid, and byteswap it if necessary.
154 zil_read_log_block(zilog_t *zilog, const blkptr_t *bp, arc_buf_t **abufpp)
158 uint32_t aflags = ARC_WAIT;
161 zb.zb_objset = bp->blk_cksum.zc_word[ZIL_ZC_OBJSET];
164 zb.zb_blkid = bp->blk_cksum.zc_word[ZIL_ZC_SEQ];
169 * We shouldn't be doing any scrubbing while we're doing log
170 * replay, it's OK to not lock.
172 error = arc_read_nolock(NULL, zilog->zl_spa, &blk,
173 arc_getbuf_func, abufpp, ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL |
174 ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB, &aflags, &zb);
177 char *data = (*abufpp)->b_data;
178 uint64_t blksz = BP_GET_LSIZE(bp);
179 zil_trailer_t *ztp = (zil_trailer_t *)(data + blksz) - 1;
180 zio_cksum_t cksum = bp->blk_cksum;
183 * Validate the checksummed log block.
185 * Sequence numbers should be... sequential. The checksum
186 * verifier for the next block should be bp's checksum plus 1.
188 * Also check the log chain linkage and size used.
190 cksum.zc_word[ZIL_ZC_SEQ]++;
192 if (bcmp(&cksum, &ztp->zit_next_blk.blk_cksum,
193 sizeof (cksum)) || BP_IS_HOLE(&ztp->zit_next_blk) ||
194 (ztp->zit_nused > (blksz - sizeof (zil_trailer_t)))) {
199 VERIFY(arc_buf_remove_ref(*abufpp, abufpp) == 1);
204 dprintf("error %d on %llu:%llu\n", error, zb.zb_objset, zb.zb_blkid);
210 * Parse the intent log, and call parse_func for each valid record within.
211 * Return the highest sequence number.
214 zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func,
215 zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg)
217 const zil_header_t *zh = zilog->zl_header;
218 uint64_t claim_seq = zh->zh_claim_seq;
220 uint64_t max_seq = 0;
221 blkptr_t blk = zh->zh_log;
227 if (BP_IS_HOLE(&blk))
231 * Starting at the block pointed to by zh_log we read the log chain.
232 * For each block in the chain we strongly check that block to
233 * ensure its validity. We stop when an invalid block is found.
234 * For each block pointer in the chain we call parse_blk_func().
235 * For each record in each valid block we call parse_lr_func().
236 * If the log has been claimed, stop if we encounter a sequence
237 * number greater than the highest claimed sequence number.
239 zil_dva_tree_init(&zilog->zl_dva_tree);
241 seq = blk.blk_cksum.zc_word[ZIL_ZC_SEQ];
243 if (claim_seq != 0 && seq > claim_seq)
246 ASSERT(max_seq < seq);
249 error = zil_read_log_block(zilog, &blk, &abuf);
251 if (parse_blk_func != NULL)
252 parse_blk_func(zilog, &blk, arg, txg);
257 lrbuf = abuf->b_data;
258 ztp = (zil_trailer_t *)(lrbuf + BP_GET_LSIZE(&blk)) - 1;
259 blk = ztp->zit_next_blk;
261 if (parse_lr_func == NULL) {
262 VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1);
266 for (lrp = lrbuf; lrp < lrbuf + ztp->zit_nused; lrp += reclen) {
267 lr_t *lr = (lr_t *)lrp;
268 reclen = lr->lrc_reclen;
269 ASSERT3U(reclen, >=, sizeof (lr_t));
270 parse_lr_func(zilog, lr, arg, txg);
272 VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1);
274 zil_dva_tree_fini(&zilog->zl_dva_tree);
281 zil_claim_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t first_txg)
283 spa_t *spa = zilog->zl_spa;
287 * Claim log block if not already committed and not already claimed.
289 if (bp->blk_birth >= first_txg &&
290 zil_dva_tree_add(&zilog->zl_dva_tree, BP_IDENTITY(bp)) == 0) {
291 err = zio_wait(zio_claim(NULL, spa, first_txg, bp, NULL, NULL,
292 ZIO_FLAG_MUSTSUCCEED));
298 zil_claim_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t first_txg)
300 if (lrc->lrc_txtype == TX_WRITE) {
301 lr_write_t *lr = (lr_write_t *)lrc;
302 zil_claim_log_block(zilog, &lr->lr_blkptr, tx, first_txg);
308 zil_free_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t claim_txg)
310 zio_free_blk(zilog->zl_spa, bp, dmu_tx_get_txg(tx));
314 zil_free_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t claim_txg)
317 * If we previously claimed it, we need to free it.
319 if (claim_txg != 0 && lrc->lrc_txtype == TX_WRITE) {
320 lr_write_t *lr = (lr_write_t *)lrc;
321 blkptr_t *bp = &lr->lr_blkptr;
322 if (bp->blk_birth >= claim_txg &&
323 !zil_dva_tree_add(&zilog->zl_dva_tree, BP_IDENTITY(bp))) {
324 (void) arc_free(NULL, zilog->zl_spa,
325 dmu_tx_get_txg(tx), bp, NULL, NULL, ARC_WAIT);
331 * Create an on-disk intent log.
334 zil_create(zilog_t *zilog)
336 const zil_header_t *zh = zilog->zl_header;
344 * Wait for any previous destroy to complete.
346 txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg);
348 ASSERT(zh->zh_claim_txg == 0);
349 ASSERT(zh->zh_replay_seq == 0);
354 * If we don't already have an initial log block, allocate one now.
356 if (BP_IS_HOLE(&blk)) {
357 tx = dmu_tx_create(zilog->zl_os);
358 (void) dmu_tx_assign(tx, TXG_WAIT);
359 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
360 txg = dmu_tx_get_txg(tx);
362 error = zio_alloc_blk(zilog->zl_spa, ZIL_MIN_BLKSZ, &blk,
366 zil_init_log_chain(zilog, &blk);
370 * Allocate a log write buffer (lwb) for the first log block.
373 lwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP);
374 lwb->lwb_zilog = zilog;
377 lwb->lwb_sz = BP_GET_LSIZE(&lwb->lwb_blk);
378 lwb->lwb_buf = zio_buf_alloc(lwb->lwb_sz);
379 lwb->lwb_max_txg = txg;
382 mutex_enter(&zilog->zl_lock);
383 list_insert_tail(&zilog->zl_lwb_list, lwb);
384 mutex_exit(&zilog->zl_lock);
388 * If we just allocated the first log block, commit our transaction
389 * and wait for zil_sync() to stuff the block poiner into zh_log.
390 * (zh is part of the MOS, so we cannot modify it in open context.)
394 txg_wait_synced(zilog->zl_dmu_pool, txg);
397 ASSERT(bcmp(&blk, &zh->zh_log, sizeof (blk)) == 0);
401 * In one tx, free all log blocks and clear the log header.
402 * If keep_first is set, then we're replaying a log with no content.
403 * We want to keep the first block, however, so that the first
404 * synchronous transaction doesn't require a txg_wait_synced()
405 * in zil_create(). We don't need to txg_wait_synced() here either
406 * when keep_first is set, because both zil_create() and zil_destroy()
407 * will wait for any in-progress destroys to complete.
410 zil_destroy(zilog_t *zilog, boolean_t keep_first)
412 const zil_header_t *zh = zilog->zl_header;
418 * Wait for any previous destroy to complete.
420 txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg);
422 if (BP_IS_HOLE(&zh->zh_log))
425 tx = dmu_tx_create(zilog->zl_os);
426 (void) dmu_tx_assign(tx, TXG_WAIT);
427 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
428 txg = dmu_tx_get_txg(tx);
430 mutex_enter(&zilog->zl_lock);
433 * It is possible for the ZIL to get the previously mounted zilog
434 * structure of the same dataset if quickly remounted and the dbuf
435 * eviction has not completed. In this case we can see a non
436 * empty lwb list and keep_first will be set. We fix this by
437 * clearing the keep_first. This will be slower but it's very rare.
439 if (!list_is_empty(&zilog->zl_lwb_list) && keep_first)
440 keep_first = B_FALSE;
442 ASSERT3U(zilog->zl_destroy_txg, <, txg);
443 zilog->zl_destroy_txg = txg;
444 zilog->zl_keep_first = keep_first;
446 if (!list_is_empty(&zilog->zl_lwb_list)) {
447 ASSERT(zh->zh_claim_txg == 0);
449 while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) {
450 list_remove(&zilog->zl_lwb_list, lwb);
451 if (lwb->lwb_buf != NULL)
452 zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);
453 zio_free_blk(zilog->zl_spa, &lwb->lwb_blk, txg);
454 kmem_cache_free(zil_lwb_cache, lwb);
458 (void) zil_parse(zilog, zil_free_log_block,
459 zil_free_log_record, tx, zh->zh_claim_txg);
462 mutex_exit(&zilog->zl_lock);
468 * zil_rollback_destroy() is only called by the rollback code.
469 * We already have a syncing tx. Rollback has exclusive access to the
470 * dataset, so we don't have to worry about concurrent zil access.
471 * The actual freeing of any log blocks occurs in zil_sync() later in
472 * this txg syncing phase.
475 zil_rollback_destroy(zilog_t *zilog, dmu_tx_t *tx)
477 const zil_header_t *zh = zilog->zl_header;
480 if (BP_IS_HOLE(&zh->zh_log))
483 txg = dmu_tx_get_txg(tx);
484 ASSERT3U(zilog->zl_destroy_txg, <, txg);
485 zilog->zl_destroy_txg = txg;
486 zilog->zl_keep_first = B_FALSE;
489 * Ensure there's no outstanding ZIL IO. No lwbs or just the
490 * unused one that allocated in advance is ok.
492 ASSERT(zilog->zl_lwb_list.list_head.list_next ==
493 zilog->zl_lwb_list.list_head.list_prev);
494 (void) zil_parse(zilog, zil_free_log_block, zil_free_log_record,
495 tx, zh->zh_claim_txg);
499 zil_claim(char *osname, void *txarg)
501 dmu_tx_t *tx = txarg;
502 uint64_t first_txg = dmu_tx_get_txg(tx);
508 error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
510 cmn_err(CE_WARN, "can't open objset for %s", osname);
514 zilog = dmu_objset_zil(os);
515 zh = zil_header_in_syncing_context(zilog);
518 * Claim all log blocks if we haven't already done so, and remember
519 * the highest claimed sequence number. This ensures that if we can
520 * read only part of the log now (e.g. due to a missing device),
521 * but we can read the entire log later, we will not try to replay
522 * or destroy beyond the last block we successfully claimed.
524 ASSERT3U(zh->zh_claim_txg, <=, first_txg);
525 if (zh->zh_claim_txg == 0 && !BP_IS_HOLE(&zh->zh_log)) {
526 zh->zh_claim_txg = first_txg;
527 zh->zh_claim_seq = zil_parse(zilog, zil_claim_log_block,
528 zil_claim_log_record, tx, first_txg);
529 dsl_dataset_dirty(dmu_objset_ds(os), tx);
532 ASSERT3U(first_txg, ==, (spa_last_synced_txg(zilog->zl_spa) + 1));
533 dmu_objset_close(os);
538 * Check the log by walking the log chain.
539 * Checksum errors are ok as they indicate the end of the chain.
540 * Any other error (no device or read failure) returns an error.
544 zil_check_log_chain(char *osname, void *txarg)
555 error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
557 cmn_err(CE_WARN, "can't open objset for %s", osname);
561 zilog = dmu_objset_zil(os);
562 zh = zil_header_in_syncing_context(zilog);
564 if (BP_IS_HOLE(&blk)) {
565 dmu_objset_close(os);
566 return (0); /* no chain */
570 error = zil_read_log_block(zilog, &blk, &abuf);
573 lrbuf = abuf->b_data;
574 ztp = (zil_trailer_t *)(lrbuf + BP_GET_LSIZE(&blk)) - 1;
575 blk = ztp->zit_next_blk;
576 VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1);
578 dmu_objset_close(os);
580 return (0); /* normal end of chain */
589 zil_clear_log_chain(char *osname, void *txarg)
597 error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
599 cmn_err(CE_WARN, "can't open objset for %s", osname);
603 zilog = dmu_objset_zil(os);
604 tx = dmu_tx_create(zilog->zl_os);
605 (void) dmu_tx_assign(tx, TXG_WAIT);
606 zh = zil_header_in_syncing_context(zilog);
607 BP_ZERO(&zh->zh_log);
608 dsl_dataset_dirty(dmu_objset_ds(os), tx);
610 dmu_objset_close(os);
615 zil_vdev_compare(const void *x1, const void *x2)
617 uint64_t v1 = ((zil_vdev_node_t *)x1)->zv_vdev;
618 uint64_t v2 = ((zil_vdev_node_t *)x2)->zv_vdev;
629 zil_add_block(zilog_t *zilog, blkptr_t *bp)
631 avl_tree_t *t = &zilog->zl_vdev_tree;
633 zil_vdev_node_t *zv, zvsearch;
634 int ndvas = BP_GET_NDVAS(bp);
637 if (zfs_nocacheflush)
640 ASSERT(zilog->zl_writer);
643 * Even though we're zl_writer, we still need a lock because the
644 * zl_get_data() callbacks may have dmu_sync() done callbacks
645 * that will run concurrently.
647 mutex_enter(&zilog->zl_vdev_lock);
648 for (i = 0; i < ndvas; i++) {
649 zvsearch.zv_vdev = DVA_GET_VDEV(&bp->blk_dva[i]);
650 if (avl_find(t, &zvsearch, &where) == NULL) {
651 zv = kmem_alloc(sizeof (*zv), KM_SLEEP);
652 zv->zv_vdev = zvsearch.zv_vdev;
653 avl_insert(t, zv, where);
656 mutex_exit(&zilog->zl_vdev_lock);
660 zil_flush_vdevs(zilog_t *zilog)
662 spa_t *spa = zilog->zl_spa;
663 avl_tree_t *t = &zilog->zl_vdev_tree;
668 ASSERT(zilog->zl_writer);
671 * We don't need zl_vdev_lock here because we're the zl_writer,
672 * and all zl_get_data() callbacks are done.
674 if (avl_numnodes(t) == 0)
677 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
679 zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL);
681 while ((zv = avl_destroy_nodes(t, &cookie)) != NULL) {
682 vdev_t *vd = vdev_lookup_top(spa, zv->zv_vdev);
685 kmem_free(zv, sizeof (*zv));
689 * Wait for all the flushes to complete. Not all devices actually
690 * support the DKIOCFLUSHWRITECACHE ioctl, so it's OK if it fails.
692 (void) zio_wait(zio);
694 spa_config_exit(spa, SCL_STATE, FTAG);
698 * Function called when a log block write completes
701 zil_lwb_write_done(zio_t *zio)
703 lwb_t *lwb = zio->io_private;
704 zilog_t *zilog = lwb->lwb_zilog;
706 ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF);
707 ASSERT(BP_GET_CHECKSUM(zio->io_bp) == ZIO_CHECKSUM_ZILOG);
708 ASSERT(BP_GET_TYPE(zio->io_bp) == DMU_OT_INTENT_LOG);
709 ASSERT(BP_GET_LEVEL(zio->io_bp) == 0);
710 ASSERT(BP_GET_BYTEORDER(zio->io_bp) == ZFS_HOST_BYTEORDER);
711 ASSERT(!BP_IS_GANG(zio->io_bp));
712 ASSERT(!BP_IS_HOLE(zio->io_bp));
713 ASSERT(zio->io_bp->blk_fill == 0);
716 * Now that we've written this log block, we have a stable pointer
717 * to the next block in the chain, so it's OK to let the txg in
718 * which we allocated the next block sync.
720 txg_rele_to_sync(&lwb->lwb_txgh);
722 zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);
723 mutex_enter(&zilog->zl_lock);
726 zilog->zl_log_error = B_TRUE;
727 mutex_exit(&zilog->zl_lock);
731 * Initialize the io for a log block.
734 zil_lwb_write_init(zilog_t *zilog, lwb_t *lwb)
738 zb.zb_objset = lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_OBJSET];
741 zb.zb_blkid = lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_SEQ];
743 if (zilog->zl_root_zio == NULL) {
744 zilog->zl_root_zio = zio_root(zilog->zl_spa, NULL, NULL,
747 if (lwb->lwb_zio == NULL) {
748 lwb->lwb_zio = zio_rewrite(zilog->zl_root_zio, zilog->zl_spa,
749 0, &lwb->lwb_blk, lwb->lwb_buf,
750 lwb->lwb_sz, zil_lwb_write_done, lwb,
751 ZIO_PRIORITY_LOG_WRITE, ZIO_FLAG_CANFAIL, &zb);
756 * Start a log block write and advance to the next log block.
757 * Calls are serialized.
760 zil_lwb_write_start(zilog_t *zilog, lwb_t *lwb)
763 zil_trailer_t *ztp = (zil_trailer_t *)(lwb->lwb_buf + lwb->lwb_sz) - 1;
764 spa_t *spa = zilog->zl_spa;
765 blkptr_t *bp = &ztp->zit_next_blk;
770 ASSERT(lwb->lwb_nused <= ZIL_BLK_DATA_SZ(lwb));
773 * Allocate the next block and save its address in this block
774 * before writing it in order to establish the log chain.
775 * Note that if the allocation of nlwb synced before we wrote
776 * the block that points at it (lwb), we'd leak it if we crashed.
777 * Therefore, we don't do txg_rele_to_sync() until zil_lwb_write_done().
779 txg = txg_hold_open(zilog->zl_dmu_pool, &lwb->lwb_txgh);
780 txg_rele_to_quiesce(&lwb->lwb_txgh);
783 * Pick a ZIL blocksize. We request a size that is the
784 * maximum of the previous used size, the current used size and
785 * the amount waiting in the queue.
787 zil_blksz = MAX(zilog->zl_prev_used,
788 zilog->zl_cur_used + sizeof (*ztp));
789 zil_blksz = MAX(zil_blksz, zilog->zl_itx_list_sz + sizeof (*ztp));
790 zil_blksz = P2ROUNDUP_TYPED(zil_blksz, ZIL_MIN_BLKSZ, uint64_t);
791 if (zil_blksz > ZIL_MAX_BLKSZ)
792 zil_blksz = ZIL_MAX_BLKSZ;
795 /* pass the old blkptr in order to spread log blocks across devs */
796 error = zio_alloc_blk(spa, zil_blksz, bp, &lwb->lwb_blk, txg);
798 dmu_tx_t *tx = dmu_tx_create_assigned(zilog->zl_dmu_pool, txg);
801 * We dirty the dataset to ensure that zil_sync() will
802 * be called to remove this lwb from our zl_lwb_list.
803 * Failing to do so, may leave an lwb with a NULL lwb_buf
804 * hanging around on the zl_lwb_list.
806 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
810 * Since we've just experienced an allocation failure so we
811 * terminate the current lwb and send it on its way.
814 ztp->zit_nused = lwb->lwb_nused;
815 ztp->zit_bt.zbt_cksum = lwb->lwb_blk.blk_cksum;
816 zio_nowait(lwb->lwb_zio);
819 * By returning NULL the caller will call tx_wait_synced()
824 ASSERT3U(bp->blk_birth, ==, txg);
826 ztp->zit_nused = lwb->lwb_nused;
827 ztp->zit_bt.zbt_cksum = lwb->lwb_blk.blk_cksum;
828 bp->blk_cksum = lwb->lwb_blk.blk_cksum;
829 bp->blk_cksum.zc_word[ZIL_ZC_SEQ]++;
832 * Allocate a new log write buffer (lwb).
834 nlwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP);
836 nlwb->lwb_zilog = zilog;
839 nlwb->lwb_sz = BP_GET_LSIZE(&nlwb->lwb_blk);
840 nlwb->lwb_buf = zio_buf_alloc(nlwb->lwb_sz);
841 nlwb->lwb_max_txg = txg;
842 nlwb->lwb_zio = NULL;
845 * Put new lwb at the end of the log chain
847 mutex_enter(&zilog->zl_lock);
848 list_insert_tail(&zilog->zl_lwb_list, nlwb);
849 mutex_exit(&zilog->zl_lock);
851 /* Record the block for later vdev flushing */
852 zil_add_block(zilog, &lwb->lwb_blk);
855 * kick off the write for the old log block
857 dprintf_bp(&lwb->lwb_blk, "lwb %p txg %llu: ", lwb, txg);
858 ASSERT(lwb->lwb_zio);
859 zio_nowait(lwb->lwb_zio);
865 zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb)
867 lr_t *lrc = &itx->itx_lr; /* common log record */
868 lr_write_t *lr = (lr_write_t *)lrc;
869 uint64_t txg = lrc->lrc_txg;
870 uint64_t reclen = lrc->lrc_reclen;
875 ASSERT(lwb->lwb_buf != NULL);
877 if (lrc->lrc_txtype == TX_WRITE && itx->itx_wr_state == WR_NEED_COPY)
878 dlen = P2ROUNDUP_TYPED(
879 lr->lr_length, sizeof (uint64_t), uint64_t);
883 zilog->zl_cur_used += (reclen + dlen);
885 zil_lwb_write_init(zilog, lwb);
888 * If this record won't fit in the current log block, start a new one.
890 if (lwb->lwb_nused + reclen + dlen > ZIL_BLK_DATA_SZ(lwb)) {
891 lwb = zil_lwb_write_start(zilog, lwb);
894 zil_lwb_write_init(zilog, lwb);
895 ASSERT(lwb->lwb_nused == 0);
896 if (reclen + dlen > ZIL_BLK_DATA_SZ(lwb)) {
897 txg_wait_synced(zilog->zl_dmu_pool, txg);
903 * Update the lrc_seq, to be log record sequence number. See zil.h
904 * Then copy the record to the log buffer.
906 lrc->lrc_seq = ++zilog->zl_lr_seq; /* we are single threaded */
907 bcopy(lrc, lwb->lwb_buf + lwb->lwb_nused, reclen);
910 * If it's a write, fetch the data or get its blkptr as appropriate.
912 if (lrc->lrc_txtype == TX_WRITE) {
913 if (txg > spa_freeze_txg(zilog->zl_spa))
914 txg_wait_synced(zilog->zl_dmu_pool, txg);
915 if (itx->itx_wr_state != WR_COPIED) {
919 /* alignment is guaranteed */
920 lr = (lr_write_t *)(lwb->lwb_buf + lwb->lwb_nused);
922 ASSERT(itx->itx_wr_state == WR_NEED_COPY);
923 dbuf = lwb->lwb_buf + lwb->lwb_nused + reclen;
924 lr->lr_common.lrc_reclen += dlen;
926 ASSERT(itx->itx_wr_state == WR_INDIRECT);
929 error = zilog->zl_get_data(
930 itx->itx_private, lr, dbuf, lwb->lwb_zio);
932 ASSERT(error == ENOENT || error == EEXIST ||
939 lwb->lwb_nused += reclen + dlen;
940 lwb->lwb_max_txg = MAX(lwb->lwb_max_txg, txg);
941 ASSERT3U(lwb->lwb_nused, <=, ZIL_BLK_DATA_SZ(lwb));
942 ASSERT3U(P2PHASE(lwb->lwb_nused, sizeof (uint64_t)), ==, 0);
948 zil_itx_create(uint64_t txtype, size_t lrsize)
952 lrsize = P2ROUNDUP_TYPED(lrsize, sizeof (uint64_t), size_t);
954 itx = kmem_alloc(offsetof(itx_t, itx_lr) + lrsize, KM_SLEEP);
955 itx->itx_lr.lrc_txtype = txtype;
956 itx->itx_lr.lrc_reclen = lrsize;
957 itx->itx_sod = lrsize; /* if write & WR_NEED_COPY will be increased */
958 itx->itx_lr.lrc_seq = 0; /* defensive */
964 zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx)
968 ASSERT(itx->itx_lr.lrc_seq == 0);
970 mutex_enter(&zilog->zl_lock);
971 list_insert_tail(&zilog->zl_itx_list, itx);
972 zilog->zl_itx_list_sz += itx->itx_sod;
973 itx->itx_lr.lrc_txg = dmu_tx_get_txg(tx);
974 itx->itx_lr.lrc_seq = seq = ++zilog->zl_itx_seq;
975 mutex_exit(&zilog->zl_lock);
981 * Free up all in-memory intent log transactions that have now been synced.
984 zil_itx_clean(zilog_t *zilog)
986 uint64_t synced_txg = spa_last_synced_txg(zilog->zl_spa);
987 uint64_t freeze_txg = spa_freeze_txg(zilog->zl_spa);
991 list_create(&clean_list, sizeof (itx_t), offsetof(itx_t, itx_node));
993 mutex_enter(&zilog->zl_lock);
994 /* wait for a log writer to finish walking list */
995 while (zilog->zl_writer) {
996 cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock);
1000 * Move the sync'd log transactions to a separate list so we can call
1001 * kmem_free without holding the zl_lock.
1003 * There is no need to set zl_writer as we don't drop zl_lock here
1005 while ((itx = list_head(&zilog->zl_itx_list)) != NULL &&
1006 itx->itx_lr.lrc_txg <= MIN(synced_txg, freeze_txg)) {
1007 list_remove(&zilog->zl_itx_list, itx);
1008 zilog->zl_itx_list_sz -= itx->itx_sod;
1009 list_insert_tail(&clean_list, itx);
1011 cv_broadcast(&zilog->zl_cv_writer);
1012 mutex_exit(&zilog->zl_lock);
1014 /* destroy sync'd log transactions */
1015 while ((itx = list_head(&clean_list)) != NULL) {
1016 list_remove(&clean_list, itx);
1017 kmem_free(itx, offsetof(itx_t, itx_lr)
1018 + itx->itx_lr.lrc_reclen);
1020 list_destroy(&clean_list);
1024 * If there are any in-memory intent log transactions which have now been
1025 * synced then start up a taskq to free them.
1028 zil_clean(zilog_t *zilog)
1032 mutex_enter(&zilog->zl_lock);
1033 itx = list_head(&zilog->zl_itx_list);
1034 if ((itx != NULL) &&
1035 (itx->itx_lr.lrc_txg <= spa_last_synced_txg(zilog->zl_spa))) {
1036 (void) taskq_dispatch(zilog->zl_clean_taskq,
1037 (void (*)(void *))zil_itx_clean, zilog, TQ_NOSLEEP);
1039 mutex_exit(&zilog->zl_lock);
1043 zil_commit_writer(zilog_t *zilog, uint64_t seq, uint64_t foid)
1046 uint64_t commit_seq = 0;
1047 itx_t *itx, *itx_next = (itx_t *)-1;
1051 zilog->zl_writer = B_TRUE;
1052 ASSERT(zilog->zl_root_zio == NULL);
1053 spa = zilog->zl_spa;
1055 if (zilog->zl_suspend) {
1058 lwb = list_tail(&zilog->zl_lwb_list);
1061 * Return if there's nothing to flush before we
1062 * dirty the fs by calling zil_create()
1064 if (list_is_empty(&zilog->zl_itx_list)) {
1065 zilog->zl_writer = B_FALSE;
1068 mutex_exit(&zilog->zl_lock);
1070 mutex_enter(&zilog->zl_lock);
1071 lwb = list_tail(&zilog->zl_lwb_list);
1075 /* Loop through in-memory log transactions filling log blocks. */
1076 DTRACE_PROBE1(zil__cw1, zilog_t *, zilog);
1079 * Find the next itx to push:
1080 * Push all transactions related to specified foid and all
1081 * other transactions except TX_WRITE, TX_TRUNCATE,
1082 * TX_SETATTR and TX_ACL for all other files.
1084 if (itx_next != (itx_t *)-1)
1087 itx = list_head(&zilog->zl_itx_list);
1088 for (; itx != NULL; itx = list_next(&zilog->zl_itx_list, itx)) {
1089 if (foid == 0) /* push all foids? */
1091 if (itx->itx_sync) /* push all O_[D]SYNC */
1093 switch (itx->itx_lr.lrc_txtype) {
1098 /* lr_foid is same offset for these records */
1099 if (((lr_write_t *)&itx->itx_lr)->lr_foid
1101 continue; /* skip this record */
1109 if ((itx->itx_lr.lrc_seq > seq) &&
1110 ((lwb == NULL) || (lwb->lwb_nused == 0) ||
1111 (lwb->lwb_nused + itx->itx_sod > ZIL_BLK_DATA_SZ(lwb)))) {
1116 * Save the next pointer. Even though we soon drop
1117 * zl_lock all threads that may change the list
1118 * (another writer or zil_itx_clean) can't do so until
1119 * they have zl_writer.
1121 itx_next = list_next(&zilog->zl_itx_list, itx);
1122 list_remove(&zilog->zl_itx_list, itx);
1123 zilog->zl_itx_list_sz -= itx->itx_sod;
1124 mutex_exit(&zilog->zl_lock);
1125 txg = itx->itx_lr.lrc_txg;
1128 if (txg > spa_last_synced_txg(spa) ||
1129 txg > spa_freeze_txg(spa))
1130 lwb = zil_lwb_commit(zilog, itx, lwb);
1131 kmem_free(itx, offsetof(itx_t, itx_lr)
1132 + itx->itx_lr.lrc_reclen);
1133 mutex_enter(&zilog->zl_lock);
1135 DTRACE_PROBE1(zil__cw2, zilog_t *, zilog);
1136 /* determine commit sequence number */
1137 itx = list_head(&zilog->zl_itx_list);
1139 commit_seq = itx->itx_lr.lrc_seq;
1141 commit_seq = zilog->zl_itx_seq;
1142 mutex_exit(&zilog->zl_lock);
1144 /* write the last block out */
1145 if (lwb != NULL && lwb->lwb_zio != NULL)
1146 lwb = zil_lwb_write_start(zilog, lwb);
1148 zilog->zl_prev_used = zilog->zl_cur_used;
1149 zilog->zl_cur_used = 0;
1152 * Wait if necessary for the log blocks to be on stable storage.
1154 if (zilog->zl_root_zio) {
1155 DTRACE_PROBE1(zil__cw3, zilog_t *, zilog);
1156 (void) zio_wait(zilog->zl_root_zio);
1157 zilog->zl_root_zio = NULL;
1158 DTRACE_PROBE1(zil__cw4, zilog_t *, zilog);
1159 zil_flush_vdevs(zilog);
1162 if (zilog->zl_log_error || lwb == NULL) {
1163 zilog->zl_log_error = 0;
1164 txg_wait_synced(zilog->zl_dmu_pool, 0);
1167 mutex_enter(&zilog->zl_lock);
1168 zilog->zl_writer = B_FALSE;
1170 ASSERT3U(commit_seq, >=, zilog->zl_commit_seq);
1171 zilog->zl_commit_seq = commit_seq;
1175 * Push zfs transactions to stable storage up to the supplied sequence number.
1176 * If foid is 0 push out all transactions, otherwise push only those
1177 * for that file or might have been used to create that file.
1180 zil_commit(zilog_t *zilog, uint64_t seq, uint64_t foid)
1182 if (zilog == NULL || seq == 0)
1185 mutex_enter(&zilog->zl_lock);
1187 seq = MIN(seq, zilog->zl_itx_seq); /* cap seq at largest itx seq */
1189 while (zilog->zl_writer) {
1190 cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock);
1191 if (seq < zilog->zl_commit_seq) {
1192 mutex_exit(&zilog->zl_lock);
1196 zil_commit_writer(zilog, seq, foid); /* drops zl_lock */
1197 /* wake up others waiting on the commit */
1198 cv_broadcast(&zilog->zl_cv_writer);
1199 mutex_exit(&zilog->zl_lock);
1203 * Called in syncing context to free committed log blocks and update log header.
1206 zil_sync(zilog_t *zilog, dmu_tx_t *tx)
1208 zil_header_t *zh = zil_header_in_syncing_context(zilog);
1209 uint64_t txg = dmu_tx_get_txg(tx);
1210 spa_t *spa = zilog->zl_spa;
1213 mutex_enter(&zilog->zl_lock);
1215 ASSERT(zilog->zl_stop_sync == 0);
1217 zh->zh_replay_seq = zilog->zl_replay_seq[txg & TXG_MASK];
1219 if (zilog->zl_destroy_txg == txg) {
1220 blkptr_t blk = zh->zh_log;
1222 ASSERT(list_head(&zilog->zl_lwb_list) == NULL);
1223 ASSERT(spa_sync_pass(spa) == 1);
1225 bzero(zh, sizeof (zil_header_t));
1226 bzero(zilog->zl_replay_seq, sizeof (zilog->zl_replay_seq));
1228 if (zilog->zl_keep_first) {
1230 * If this block was part of log chain that couldn't
1231 * be claimed because a device was missing during
1232 * zil_claim(), but that device later returns,
1233 * then this block could erroneously appear valid.
1234 * To guard against this, assign a new GUID to the new
1235 * log chain so it doesn't matter what blk points to.
1237 zil_init_log_chain(zilog, &blk);
1243 lwb = list_head(&zilog->zl_lwb_list);
1245 mutex_exit(&zilog->zl_lock);
1248 zh->zh_log = lwb->lwb_blk;
1249 if (lwb->lwb_buf != NULL || lwb->lwb_max_txg > txg)
1251 list_remove(&zilog->zl_lwb_list, lwb);
1252 zio_free_blk(spa, &lwb->lwb_blk, txg);
1253 kmem_cache_free(zil_lwb_cache, lwb);
1256 * If we don't have anything left in the lwb list then
1257 * we've had an allocation failure and we need to zero
1258 * out the zil_header blkptr so that we don't end
1259 * up freeing the same block twice.
1261 if (list_head(&zilog->zl_lwb_list) == NULL)
1262 BP_ZERO(&zh->zh_log);
1264 mutex_exit(&zilog->zl_lock);
1270 zil_lwb_cache = kmem_cache_create("zil_lwb_cache",
1271 sizeof (struct lwb), 0, NULL, NULL, NULL, NULL, NULL, 0);
1277 kmem_cache_destroy(zil_lwb_cache);
1281 zil_alloc(objset_t *os, zil_header_t *zh_phys)
1285 zilog = kmem_zalloc(sizeof (zilog_t), KM_SLEEP);
1287 zilog->zl_header = zh_phys;
1289 zilog->zl_spa = dmu_objset_spa(os);
1290 zilog->zl_dmu_pool = dmu_objset_pool(os);
1291 zilog->zl_destroy_txg = TXG_INITIAL - 1;
1293 mutex_init(&zilog->zl_lock, NULL, MUTEX_DEFAULT, NULL);
1295 list_create(&zilog->zl_itx_list, sizeof (itx_t),
1296 offsetof(itx_t, itx_node));
1298 list_create(&zilog->zl_lwb_list, sizeof (lwb_t),
1299 offsetof(lwb_t, lwb_node));
1301 mutex_init(&zilog->zl_vdev_lock, NULL, MUTEX_DEFAULT, NULL);
1303 avl_create(&zilog->zl_vdev_tree, zil_vdev_compare,
1304 sizeof (zil_vdev_node_t), offsetof(zil_vdev_node_t, zv_node));
1306 cv_init(&zilog->zl_cv_writer, NULL, CV_DEFAULT, NULL);
1307 cv_init(&zilog->zl_cv_suspend, NULL, CV_DEFAULT, NULL);
1313 zil_free(zilog_t *zilog)
1317 zilog->zl_stop_sync = 1;
1319 while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) {
1320 list_remove(&zilog->zl_lwb_list, lwb);
1321 if (lwb->lwb_buf != NULL)
1322 zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);
1323 kmem_cache_free(zil_lwb_cache, lwb);
1325 list_destroy(&zilog->zl_lwb_list);
1327 avl_destroy(&zilog->zl_vdev_tree);
1328 mutex_destroy(&zilog->zl_vdev_lock);
1330 ASSERT(list_head(&zilog->zl_itx_list) == NULL);
1331 list_destroy(&zilog->zl_itx_list);
1332 mutex_destroy(&zilog->zl_lock);
1334 cv_destroy(&zilog->zl_cv_writer);
1335 cv_destroy(&zilog->zl_cv_suspend);
1337 kmem_free(zilog, sizeof (zilog_t));
1341 * return true if the initial log block is not valid
1344 zil_empty(zilog_t *zilog)
1346 const zil_header_t *zh = zilog->zl_header;
1347 arc_buf_t *abuf = NULL;
1349 if (BP_IS_HOLE(&zh->zh_log))
1352 if (zil_read_log_block(zilog, &zh->zh_log, &abuf) != 0)
1355 VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1);
1360 * Open an intent log.
1363 zil_open(objset_t *os, zil_get_data_t *get_data)
1365 zilog_t *zilog = dmu_objset_zil(os);
1367 zilog->zl_get_data = get_data;
1368 zilog->zl_clean_taskq = taskq_create("zil_clean", 1, minclsyspri,
1369 2, 2, TASKQ_PREPOPULATE);
1375 * Close an intent log.
1378 zil_close(zilog_t *zilog)
1381 * If the log isn't already committed, mark the objset dirty
1382 * (so zil_sync() will be called) and wait for that txg to sync.
1384 if (!zil_is_committed(zilog)) {
1386 dmu_tx_t *tx = dmu_tx_create(zilog->zl_os);
1387 (void) dmu_tx_assign(tx, TXG_WAIT);
1388 dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
1389 txg = dmu_tx_get_txg(tx);
1391 txg_wait_synced(zilog->zl_dmu_pool, txg);
1394 taskq_destroy(zilog->zl_clean_taskq);
1395 zilog->zl_clean_taskq = NULL;
1396 zilog->zl_get_data = NULL;
1398 zil_itx_clean(zilog);
1399 ASSERT(list_head(&zilog->zl_itx_list) == NULL);
1403 * Suspend an intent log. While in suspended mode, we still honor
1404 * synchronous semantics, but we rely on txg_wait_synced() to do it.
1405 * We suspend the log briefly when taking a snapshot so that the snapshot
1406 * contains all the data it's supposed to, and has an empty intent log.
1409 zil_suspend(zilog_t *zilog)
1411 const zil_header_t *zh = zilog->zl_header;
1413 mutex_enter(&zilog->zl_lock);
1414 if (zh->zh_claim_txg != 0) { /* unplayed log */
1415 mutex_exit(&zilog->zl_lock);
1418 if (zilog->zl_suspend++ != 0) {
1420 * Someone else already began a suspend.
1421 * Just wait for them to finish.
1423 while (zilog->zl_suspending)
1424 cv_wait(&zilog->zl_cv_suspend, &zilog->zl_lock);
1425 mutex_exit(&zilog->zl_lock);
1428 zilog->zl_suspending = B_TRUE;
1429 mutex_exit(&zilog->zl_lock);
1431 zil_commit(zilog, UINT64_MAX, 0);
1434 * Wait for any in-flight log writes to complete.
1436 mutex_enter(&zilog->zl_lock);
1437 while (zilog->zl_writer)
1438 cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock);
1439 mutex_exit(&zilog->zl_lock);
1441 zil_destroy(zilog, B_FALSE);
1443 mutex_enter(&zilog->zl_lock);
1444 zilog->zl_suspending = B_FALSE;
1445 cv_broadcast(&zilog->zl_cv_suspend);
1446 mutex_exit(&zilog->zl_lock);
1452 zil_resume(zilog_t *zilog)
1454 mutex_enter(&zilog->zl_lock);
1455 ASSERT(zilog->zl_suspend != 0);
1456 zilog->zl_suspend--;
1457 mutex_exit(&zilog->zl_lock);
1460 typedef struct zil_replay_arg {
1462 zil_replay_func_t **zr_replay;
1463 zil_replay_cleaner_t *zr_replay_cleaner;
1466 boolean_t zr_byteswap;
1471 zil_replay_log_record(zilog_t *zilog, lr_t *lr, void *zra, uint64_t claim_txg)
1473 zil_replay_arg_t *zr = zra;
1474 const zil_header_t *zh = zilog->zl_header;
1475 uint64_t reclen = lr->lrc_reclen;
1476 uint64_t txtype = lr->lrc_txtype;
1478 int pass, error, sunk;
1480 if (zilog->zl_stop_replay)
1483 if (lr->lrc_txg < claim_txg) /* already committed */
1486 if (lr->lrc_seq <= zh->zh_replay_seq) /* already replayed */
1489 /* Strip case-insensitive bit, still present in log record */
1493 * Make a copy of the data so we can revise and extend it.
1495 bcopy(lr, zr->zr_lrbuf, reclen);
1498 * The log block containing this lr may have been byteswapped
1499 * so that we can easily examine common fields like lrc_txtype.
1500 * However, the log is a mix of different data types, and only the
1501 * replay vectors know how to byteswap their records. Therefore, if
1502 * the lr was byteswapped, undo it before invoking the replay vector.
1504 if (zr->zr_byteswap)
1505 byteswap_uint64_array(zr->zr_lrbuf, reclen);
1508 * If this is a TX_WRITE with a blkptr, suck in the data.
1510 if (txtype == TX_WRITE && reclen == sizeof (lr_write_t)) {
1511 lr_write_t *lrw = (lr_write_t *)lr;
1512 blkptr_t *wbp = &lrw->lr_blkptr;
1513 uint64_t wlen = lrw->lr_length;
1514 char *wbuf = zr->zr_lrbuf + reclen;
1516 if (BP_IS_HOLE(wbp)) { /* compressed to a hole */
1520 * A subsequent write may have overwritten this block,
1521 * in which case wbp may have been been freed and
1522 * reallocated, and our read of wbp may fail with a
1523 * checksum error. We can safely ignore this because
1524 * the later write will provide the correct data.
1528 zb.zb_objset = dmu_objset_id(zilog->zl_os);
1529 zb.zb_object = lrw->lr_foid;
1531 zb.zb_blkid = lrw->lr_offset / BP_GET_LSIZE(wbp);
1533 (void) zio_wait(zio_read(NULL, zilog->zl_spa,
1534 wbp, wbuf, BP_GET_LSIZE(wbp), NULL, NULL,
1535 ZIO_PRIORITY_SYNC_READ,
1536 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &zb));
1537 (void) memmove(wbuf, wbuf + lrw->lr_blkoff, wlen);
1542 * Replay of large truncates can end up needing additional txs
1543 * and a different txg. If they are nested within the replay tx
1544 * as below then a hang is possible. So we do the truncate here
1545 * and redo the truncate later (a no-op) and update the sequence
1546 * number whilst in the replay tx. Fortunately, it's safe to repeat
1547 * a truncate if we crash and the truncate commits. A create over
1548 * an existing file will also come in as a TX_TRUNCATE record.
1550 * Note, remove of large files and renames over large files is
1551 * handled by putting the deleted object on a stable list
1552 * and if necessary force deleting the object outside of the replay
1553 * transaction using the zr_replay_cleaner.
1555 if (txtype == TX_TRUNCATE) {
1556 *zr->zr_txgp = TXG_NOWAIT;
1557 error = zr->zr_replay[TX_TRUNCATE](zr->zr_arg, zr->zr_lrbuf,
1561 zr->zr_byteswap = 0; /* only byteswap once */
1565 * We must now do two things atomically: replay this log record,
1566 * and update the log header to reflect the fact that we did so.
1567 * We use the DMU's ability to assign into a specific txg to do this.
1569 for (pass = 1, sunk = B_FALSE; /* CONSTANTCONDITION */; pass++) {
1570 uint64_t replay_txg;
1571 dmu_tx_t *replay_tx;
1573 replay_tx = dmu_tx_create(zr->zr_os);
1574 error = dmu_tx_assign(replay_tx, TXG_WAIT);
1576 dmu_tx_abort(replay_tx);
1580 replay_txg = dmu_tx_get_txg(replay_tx);
1582 if (txtype == 0 || txtype >= TX_MAX_TYPE) {
1586 * On the first pass, arrange for the replay vector
1587 * to fail its dmu_tx_assign(). That's the only way
1588 * to ensure that those code paths remain well tested.
1590 * Only byteswap (if needed) on the 1st pass.
1592 *zr->zr_txgp = replay_txg - (pass == 1);
1593 error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lrbuf,
1594 zr->zr_byteswap && pass == 1);
1595 *zr->zr_txgp = TXG_NOWAIT;
1599 dsl_dataset_dirty(dmu_objset_ds(zr->zr_os), replay_tx);
1600 zilog->zl_replay_seq[replay_txg & TXG_MASK] =
1604 dmu_tx_commit(replay_tx);
1610 * The DMU's dnode layer doesn't see removes until the txg
1611 * commits, so a subsequent claim can spuriously fail with
1612 * EEXIST. So if we receive any error other than ERESTART
1613 * we try syncing out any removes then retrying the
1616 if (error != ERESTART && !sunk) {
1617 if (zr->zr_replay_cleaner)
1618 zr->zr_replay_cleaner(zr->zr_arg);
1619 txg_wait_synced(spa_get_dsl(zilog->zl_spa), 0);
1621 continue; /* retry */
1624 if (error != ERESTART)
1628 txg_wait_open(spa_get_dsl(zilog->zl_spa),
1631 dprintf("pass %d, retrying\n", pass);
1635 ASSERT(error && error != ERESTART);
1636 name = kmem_alloc(MAXNAMELEN, KM_SLEEP);
1637 dmu_objset_name(zr->zr_os, name);
1638 cmn_err(CE_WARN, "ZFS replay transaction error %d, "
1639 "dataset %s, seq 0x%llx, txtype %llu %s\n",
1640 error, name, (u_longlong_t)lr->lrc_seq, (u_longlong_t)txtype,
1641 (lr->lrc_txtype & TX_CI) ? "CI" : "");
1642 zilog->zl_stop_replay = 1;
1643 kmem_free(name, MAXNAMELEN);
1648 zil_incr_blks(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
1650 zilog->zl_replay_blks++;
1654 * If this dataset has a non-empty intent log, replay it and destroy it.
1657 zil_replay(objset_t *os, void *arg, uint64_t *txgp,
1658 zil_replay_func_t *replay_func[TX_MAX_TYPE],
1659 zil_replay_cleaner_t *replay_cleaner)
1661 zilog_t *zilog = dmu_objset_zil(os);
1662 const zil_header_t *zh = zilog->zl_header;
1663 zil_replay_arg_t zr;
1665 if (zil_empty(zilog)) {
1666 zil_destroy(zilog, B_TRUE);
1671 zr.zr_replay = replay_func;
1672 zr.zr_replay_cleaner = replay_cleaner;
1675 zr.zr_byteswap = BP_SHOULD_BYTESWAP(&zh->zh_log);
1676 zr.zr_lrbuf = kmem_alloc(2 * SPA_MAXBLOCKSIZE, KM_SLEEP);
1679 * Wait for in-progress removes to sync before starting replay.
1681 txg_wait_synced(zilog->zl_dmu_pool, 0);
1683 zilog->zl_stop_replay = 0;
1684 zilog->zl_replay_time = lbolt;
1685 ASSERT(zilog->zl_replay_blks == 0);
1686 (void) zil_parse(zilog, zil_incr_blks, zil_replay_log_record, &zr,
1688 kmem_free(zr.zr_lrbuf, 2 * SPA_MAXBLOCKSIZE);
1690 zil_destroy(zilog, B_FALSE);
1691 txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg);
1695 * Report whether all transactions are committed
1698 zil_is_committed(zilog_t *zilog)
1703 mutex_enter(&zilog->zl_lock);
1704 while (zilog->zl_writer)
1705 cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock);
1707 /* recent unpushed intent log transactions? */
1708 if (!list_is_empty(&zilog->zl_itx_list)) {
1713 /* intent log never used? */
1714 lwb = list_head(&zilog->zl_lwb_list);
1721 * more than 1 log buffer means zil_sync() hasn't yet freed
1722 * entries after a txg has committed
1724 if (list_next(&zilog->zl_lwb_list, lwb)) {
1729 ASSERT(zil_empty(zilog));
1732 cv_broadcast(&zilog->zl_cv_writer);
1733 mutex_exit(&zilog->zl_lock);