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, 2014 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>
45 * The zfs intent log (ZIL) saves transaction records of system calls
46 * that change the file system in memory with enough information
47 * to be able to replay them. These are stored in memory until
48 * either the DMU transaction group (txg) commits them to the stable pool
49 * and they can be discarded, or they are flushed to the stable log
50 * (also in the pool) due to a fsync, O_DSYNC or other synchronous
51 * requirement. In the event of a panic or power fail then those log
52 * records (transactions) are replayed.
54 * There is one ZIL per file system. Its on-disk (pool) format consists
61 * A log record holds a system call transaction. Log blocks can
62 * hold many log records and the blocks are chained together.
63 * Each ZIL block contains a block pointer (blkptr_t) to the next
64 * ZIL block in the chain. The ZIL header points to the first
65 * block in the chain. Note there is not a fixed place in the pool
66 * to hold blocks. They are dynamically allocated and freed as
67 * needed from the blocks available. Figure X shows the ZIL structure:
71 * See zil.h for more information about these fields.
73 zil_stats_t zil_stats
= {
74 { "zil_commit_count", KSTAT_DATA_UINT64
},
75 { "zil_commit_writer_count", KSTAT_DATA_UINT64
},
76 { "zil_itx_count", KSTAT_DATA_UINT64
},
77 { "zil_itx_indirect_count", KSTAT_DATA_UINT64
},
78 { "zil_itx_indirect_bytes", KSTAT_DATA_UINT64
},
79 { "zil_itx_copied_count", KSTAT_DATA_UINT64
},
80 { "zil_itx_copied_bytes", KSTAT_DATA_UINT64
},
81 { "zil_itx_needcopy_count", KSTAT_DATA_UINT64
},
82 { "zil_itx_needcopy_bytes", KSTAT_DATA_UINT64
},
83 { "zil_itx_metaslab_normal_count", KSTAT_DATA_UINT64
},
84 { "zil_itx_metaslab_normal_bytes", KSTAT_DATA_UINT64
},
85 { "zil_itx_metaslab_slog_count", KSTAT_DATA_UINT64
},
86 { "zil_itx_metaslab_slog_bytes", KSTAT_DATA_UINT64
},
89 static kstat_t
*zil_ksp
;
92 * Disable intent logging replay. This global ZIL switch affects all pools.
94 int zil_replay_disable
= 0;
97 * Tunable parameter for debugging or performance analysis. Setting
98 * zfs_nocacheflush will cause corruption on power loss if a volatile
99 * out-of-order write cache is enabled.
101 int zfs_nocacheflush
= 0;
103 static kmem_cache_t
*zil_lwb_cache
;
105 static void zil_async_to_sync(zilog_t
*zilog
, uint64_t foid
);
107 #define LWB_EMPTY(lwb) ((BP_GET_LSIZE(&lwb->lwb_blk) - \
108 sizeof (zil_chain_t)) == (lwb->lwb_sz - lwb->lwb_nused))
112 * ziltest is by and large an ugly hack, but very useful in
113 * checking replay without tedious work.
114 * When running ziltest we want to keep all itx's and so maintain
115 * a single list in the zl_itxg[] that uses a high txg: ZILTEST_TXG
116 * We subtract TXG_CONCURRENT_STATES to allow for common code.
118 #define ZILTEST_TXG (UINT64_MAX - TXG_CONCURRENT_STATES)
121 zil_bp_compare(const void *x1
, const void *x2
)
123 const dva_t
*dva1
= &((zil_bp_node_t
*)x1
)->zn_dva
;
124 const dva_t
*dva2
= &((zil_bp_node_t
*)x2
)->zn_dva
;
126 if (DVA_GET_VDEV(dva1
) < DVA_GET_VDEV(dva2
))
128 if (DVA_GET_VDEV(dva1
) > DVA_GET_VDEV(dva2
))
131 if (DVA_GET_OFFSET(dva1
) < DVA_GET_OFFSET(dva2
))
133 if (DVA_GET_OFFSET(dva1
) > DVA_GET_OFFSET(dva2
))
140 zil_bp_tree_init(zilog_t
*zilog
)
142 avl_create(&zilog
->zl_bp_tree
, zil_bp_compare
,
143 sizeof (zil_bp_node_t
), offsetof(zil_bp_node_t
, zn_node
));
147 zil_bp_tree_fini(zilog_t
*zilog
)
149 avl_tree_t
*t
= &zilog
->zl_bp_tree
;
153 while ((zn
= avl_destroy_nodes(t
, &cookie
)) != NULL
)
154 kmem_free(zn
, sizeof (zil_bp_node_t
));
160 zil_bp_tree_add(zilog_t
*zilog
, const blkptr_t
*bp
)
162 avl_tree_t
*t
= &zilog
->zl_bp_tree
;
167 if (BP_IS_EMBEDDED(bp
))
170 dva
= BP_IDENTITY(bp
);
172 if (avl_find(t
, dva
, &where
) != NULL
)
173 return (SET_ERROR(EEXIST
));
175 zn
= kmem_alloc(sizeof (zil_bp_node_t
), KM_SLEEP
);
177 avl_insert(t
, zn
, where
);
182 static zil_header_t
*
183 zil_header_in_syncing_context(zilog_t
*zilog
)
185 return ((zil_header_t
*)zilog
->zl_header
);
189 zil_init_log_chain(zilog_t
*zilog
, blkptr_t
*bp
)
191 zio_cksum_t
*zc
= &bp
->blk_cksum
;
193 zc
->zc_word
[ZIL_ZC_GUID_0
] = spa_get_random(-1ULL);
194 zc
->zc_word
[ZIL_ZC_GUID_1
] = spa_get_random(-1ULL);
195 zc
->zc_word
[ZIL_ZC_OBJSET
] = dmu_objset_id(zilog
->zl_os
);
196 zc
->zc_word
[ZIL_ZC_SEQ
] = 1ULL;
200 * Read a log block and make sure it's valid.
203 zil_read_log_block(zilog_t
*zilog
, const blkptr_t
*bp
, blkptr_t
*nbp
, void *dst
,
206 enum zio_flag zio_flags
= ZIO_FLAG_CANFAIL
;
207 arc_flags_t aflags
= ARC_FLAG_WAIT
;
208 arc_buf_t
*abuf
= NULL
;
212 if (zilog
->zl_header
->zh_claim_txg
== 0)
213 zio_flags
|= ZIO_FLAG_SPECULATIVE
| ZIO_FLAG_SCRUB
;
215 if (!(zilog
->zl_header
->zh_flags
& ZIL_CLAIM_LR_SEQ_VALID
))
216 zio_flags
|= ZIO_FLAG_SPECULATIVE
;
218 SET_BOOKMARK(&zb
, bp
->blk_cksum
.zc_word
[ZIL_ZC_OBJSET
],
219 ZB_ZIL_OBJECT
, ZB_ZIL_LEVEL
, bp
->blk_cksum
.zc_word
[ZIL_ZC_SEQ
]);
221 error
= arc_read(NULL
, zilog
->zl_spa
, bp
, arc_getbuf_func
, &abuf
,
222 ZIO_PRIORITY_SYNC_READ
, zio_flags
, &aflags
, &zb
);
225 zio_cksum_t cksum
= bp
->blk_cksum
;
228 * Validate the checksummed log block.
230 * Sequence numbers should be... sequential. The checksum
231 * verifier for the next block should be bp's checksum plus 1.
233 * Also check the log chain linkage and size used.
235 cksum
.zc_word
[ZIL_ZC_SEQ
]++;
237 if (BP_GET_CHECKSUM(bp
) == ZIO_CHECKSUM_ZILOG2
) {
238 zil_chain_t
*zilc
= abuf
->b_data
;
239 char *lr
= (char *)(zilc
+ 1);
240 uint64_t len
= zilc
->zc_nused
- sizeof (zil_chain_t
);
242 if (bcmp(&cksum
, &zilc
->zc_next_blk
.blk_cksum
,
243 sizeof (cksum
)) || BP_IS_HOLE(&zilc
->zc_next_blk
)) {
244 error
= SET_ERROR(ECKSUM
);
246 ASSERT3U(len
, <=, SPA_OLD_MAXBLOCKSIZE
);
248 *end
= (char *)dst
+ len
;
249 *nbp
= zilc
->zc_next_blk
;
252 char *lr
= abuf
->b_data
;
253 uint64_t size
= BP_GET_LSIZE(bp
);
254 zil_chain_t
*zilc
= (zil_chain_t
*)(lr
+ size
) - 1;
256 if (bcmp(&cksum
, &zilc
->zc_next_blk
.blk_cksum
,
257 sizeof (cksum
)) || BP_IS_HOLE(&zilc
->zc_next_blk
) ||
258 (zilc
->zc_nused
> (size
- sizeof (*zilc
)))) {
259 error
= SET_ERROR(ECKSUM
);
261 ASSERT3U(zilc
->zc_nused
, <=,
262 SPA_OLD_MAXBLOCKSIZE
);
263 bcopy(lr
, dst
, zilc
->zc_nused
);
264 *end
= (char *)dst
+ zilc
->zc_nused
;
265 *nbp
= zilc
->zc_next_blk
;
269 VERIFY(arc_buf_remove_ref(abuf
, &abuf
));
276 * Read a TX_WRITE log data block.
279 zil_read_log_data(zilog_t
*zilog
, const lr_write_t
*lr
, void *wbuf
)
281 enum zio_flag zio_flags
= ZIO_FLAG_CANFAIL
;
282 const blkptr_t
*bp
= &lr
->lr_blkptr
;
283 arc_flags_t aflags
= ARC_FLAG_WAIT
;
284 arc_buf_t
*abuf
= NULL
;
288 if (BP_IS_HOLE(bp
)) {
290 bzero(wbuf
, MAX(BP_GET_LSIZE(bp
), lr
->lr_length
));
294 if (zilog
->zl_header
->zh_claim_txg
== 0)
295 zio_flags
|= ZIO_FLAG_SPECULATIVE
| ZIO_FLAG_SCRUB
;
297 SET_BOOKMARK(&zb
, dmu_objset_id(zilog
->zl_os
), lr
->lr_foid
,
298 ZB_ZIL_LEVEL
, lr
->lr_offset
/ BP_GET_LSIZE(bp
));
300 error
= arc_read(NULL
, zilog
->zl_spa
, bp
, arc_getbuf_func
, &abuf
,
301 ZIO_PRIORITY_SYNC_READ
, zio_flags
, &aflags
, &zb
);
305 bcopy(abuf
->b_data
, wbuf
, arc_buf_size(abuf
));
306 (void) arc_buf_remove_ref(abuf
, &abuf
);
313 * Parse the intent log, and call parse_func for each valid record within.
316 zil_parse(zilog_t
*zilog
, zil_parse_blk_func_t
*parse_blk_func
,
317 zil_parse_lr_func_t
*parse_lr_func
, void *arg
, uint64_t txg
)
319 const zil_header_t
*zh
= zilog
->zl_header
;
320 boolean_t claimed
= !!zh
->zh_claim_txg
;
321 uint64_t claim_blk_seq
= claimed
? zh
->zh_claim_blk_seq
: UINT64_MAX
;
322 uint64_t claim_lr_seq
= claimed
? zh
->zh_claim_lr_seq
: UINT64_MAX
;
323 uint64_t max_blk_seq
= 0;
324 uint64_t max_lr_seq
= 0;
325 uint64_t blk_count
= 0;
326 uint64_t lr_count
= 0;
327 blkptr_t blk
, next_blk
;
331 bzero(&next_blk
, sizeof (blkptr_t
));
334 * Old logs didn't record the maximum zh_claim_lr_seq.
336 if (!(zh
->zh_flags
& ZIL_CLAIM_LR_SEQ_VALID
))
337 claim_lr_seq
= UINT64_MAX
;
340 * Starting at the block pointed to by zh_log we read the log chain.
341 * For each block in the chain we strongly check that block to
342 * ensure its validity. We stop when an invalid block is found.
343 * For each block pointer in the chain we call parse_blk_func().
344 * For each record in each valid block we call parse_lr_func().
345 * If the log has been claimed, stop if we encounter a sequence
346 * number greater than the highest claimed sequence number.
348 lrbuf
= zio_buf_alloc(SPA_OLD_MAXBLOCKSIZE
);
349 zil_bp_tree_init(zilog
);
351 for (blk
= zh
->zh_log
; !BP_IS_HOLE(&blk
); blk
= next_blk
) {
352 uint64_t blk_seq
= blk
.blk_cksum
.zc_word
[ZIL_ZC_SEQ
];
356 if (blk_seq
> claim_blk_seq
)
358 if ((error
= parse_blk_func(zilog
, &blk
, arg
, txg
)) != 0)
360 ASSERT3U(max_blk_seq
, <, blk_seq
);
361 max_blk_seq
= blk_seq
;
364 if (max_lr_seq
== claim_lr_seq
&& max_blk_seq
== claim_blk_seq
)
367 error
= zil_read_log_block(zilog
, &blk
, &next_blk
, lrbuf
, &end
);
371 for (lrp
= lrbuf
; lrp
< end
; lrp
+= reclen
) {
372 lr_t
*lr
= (lr_t
*)lrp
;
373 reclen
= lr
->lrc_reclen
;
374 ASSERT3U(reclen
, >=, sizeof (lr_t
));
375 if (lr
->lrc_seq
> claim_lr_seq
)
377 if ((error
= parse_lr_func(zilog
, lr
, arg
, txg
)) != 0)
379 ASSERT3U(max_lr_seq
, <, lr
->lrc_seq
);
380 max_lr_seq
= lr
->lrc_seq
;
385 zilog
->zl_parse_error
= error
;
386 zilog
->zl_parse_blk_seq
= max_blk_seq
;
387 zilog
->zl_parse_lr_seq
= max_lr_seq
;
388 zilog
->zl_parse_blk_count
= blk_count
;
389 zilog
->zl_parse_lr_count
= lr_count
;
391 ASSERT(!claimed
|| !(zh
->zh_flags
& ZIL_CLAIM_LR_SEQ_VALID
) ||
392 (max_blk_seq
== claim_blk_seq
&& max_lr_seq
== claim_lr_seq
));
394 zil_bp_tree_fini(zilog
);
395 zio_buf_free(lrbuf
, SPA_OLD_MAXBLOCKSIZE
);
401 zil_claim_log_block(zilog_t
*zilog
, blkptr_t
*bp
, void *tx
, uint64_t first_txg
)
404 * Claim log block if not already committed and not already claimed.
405 * If tx == NULL, just verify that the block is claimable.
407 if (BP_IS_HOLE(bp
) || bp
->blk_birth
< first_txg
||
408 zil_bp_tree_add(zilog
, bp
) != 0)
411 return (zio_wait(zio_claim(NULL
, zilog
->zl_spa
,
412 tx
== NULL
? 0 : first_txg
, bp
, spa_claim_notify
, NULL
,
413 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
| ZIO_FLAG_SCRUB
)));
417 zil_claim_log_record(zilog_t
*zilog
, lr_t
*lrc
, void *tx
, uint64_t first_txg
)
419 lr_write_t
*lr
= (lr_write_t
*)lrc
;
422 if (lrc
->lrc_txtype
!= TX_WRITE
)
426 * If the block is not readable, don't claim it. This can happen
427 * in normal operation when a log block is written to disk before
428 * some of the dmu_sync() blocks it points to. In this case, the
429 * transaction cannot have been committed to anyone (we would have
430 * waited for all writes to be stable first), so it is semantically
431 * correct to declare this the end of the log.
433 if (lr
->lr_blkptr
.blk_birth
>= first_txg
&&
434 (error
= zil_read_log_data(zilog
, lr
, NULL
)) != 0)
436 return (zil_claim_log_block(zilog
, &lr
->lr_blkptr
, tx
, first_txg
));
441 zil_free_log_block(zilog_t
*zilog
, blkptr_t
*bp
, void *tx
, uint64_t claim_txg
)
443 zio_free_zil(zilog
->zl_spa
, dmu_tx_get_txg(tx
), bp
);
449 zil_free_log_record(zilog_t
*zilog
, lr_t
*lrc
, void *tx
, uint64_t claim_txg
)
451 lr_write_t
*lr
= (lr_write_t
*)lrc
;
452 blkptr_t
*bp
= &lr
->lr_blkptr
;
455 * If we previously claimed it, we need to free it.
457 if (claim_txg
!= 0 && lrc
->lrc_txtype
== TX_WRITE
&&
458 bp
->blk_birth
>= claim_txg
&& zil_bp_tree_add(zilog
, bp
) == 0 &&
460 zio_free(zilog
->zl_spa
, dmu_tx_get_txg(tx
), bp
);
466 zil_alloc_lwb(zilog_t
*zilog
, blkptr_t
*bp
, uint64_t txg
, boolean_t fastwrite
)
470 lwb
= kmem_cache_alloc(zil_lwb_cache
, KM_SLEEP
);
471 lwb
->lwb_zilog
= zilog
;
473 lwb
->lwb_fastwrite
= fastwrite
;
474 lwb
->lwb_buf
= zio_buf_alloc(BP_GET_LSIZE(bp
));
475 lwb
->lwb_max_txg
= txg
;
478 if (BP_GET_CHECKSUM(bp
) == ZIO_CHECKSUM_ZILOG2
) {
479 lwb
->lwb_nused
= sizeof (zil_chain_t
);
480 lwb
->lwb_sz
= BP_GET_LSIZE(bp
);
483 lwb
->lwb_sz
= BP_GET_LSIZE(bp
) - sizeof (zil_chain_t
);
486 mutex_enter(&zilog
->zl_lock
);
487 list_insert_tail(&zilog
->zl_lwb_list
, lwb
);
488 mutex_exit(&zilog
->zl_lock
);
494 * Called when we create in-memory log transactions so that we know
495 * to cleanup the itxs at the end of spa_sync().
498 zilog_dirty(zilog_t
*zilog
, uint64_t txg
)
500 dsl_pool_t
*dp
= zilog
->zl_dmu_pool
;
501 dsl_dataset_t
*ds
= dmu_objset_ds(zilog
->zl_os
);
503 if (ds
->ds_is_snapshot
)
504 panic("dirtying snapshot!");
506 if (txg_list_add(&dp
->dp_dirty_zilogs
, zilog
, txg
)) {
507 /* up the hold count until we can be written out */
508 dmu_buf_add_ref(ds
->ds_dbuf
, zilog
);
513 zilog_is_dirty(zilog_t
*zilog
)
515 dsl_pool_t
*dp
= zilog
->zl_dmu_pool
;
518 for (t
= 0; t
< TXG_SIZE
; t
++) {
519 if (txg_list_member(&dp
->dp_dirty_zilogs
, zilog
, t
))
526 * Create an on-disk intent log.
529 zil_create(zilog_t
*zilog
)
531 const zil_header_t
*zh
= zilog
->zl_header
;
537 boolean_t fastwrite
= FALSE
;
540 * Wait for any previous destroy to complete.
542 txg_wait_synced(zilog
->zl_dmu_pool
, zilog
->zl_destroy_txg
);
544 ASSERT(zh
->zh_claim_txg
== 0);
545 ASSERT(zh
->zh_replay_seq
== 0);
550 * Allocate an initial log block if:
551 * - there isn't one already
552 * - the existing block is the wrong endianess
554 if (BP_IS_HOLE(&blk
) || BP_SHOULD_BYTESWAP(&blk
)) {
555 tx
= dmu_tx_create(zilog
->zl_os
);
556 VERIFY(dmu_tx_assign(tx
, TXG_WAIT
) == 0);
557 dsl_dataset_dirty(dmu_objset_ds(zilog
->zl_os
), tx
);
558 txg
= dmu_tx_get_txg(tx
);
560 if (!BP_IS_HOLE(&blk
)) {
561 zio_free_zil(zilog
->zl_spa
, txg
, &blk
);
565 error
= zio_alloc_zil(zilog
->zl_spa
, txg
, &blk
,
566 ZIL_MIN_BLKSZ
, B_TRUE
);
570 zil_init_log_chain(zilog
, &blk
);
574 * Allocate a log write buffer (lwb) for the first log block.
577 lwb
= zil_alloc_lwb(zilog
, &blk
, txg
, fastwrite
);
580 * If we just allocated the first log block, commit our transaction
581 * and wait for zil_sync() to stuff the block poiner into zh_log.
582 * (zh is part of the MOS, so we cannot modify it in open context.)
586 txg_wait_synced(zilog
->zl_dmu_pool
, txg
);
589 ASSERT(bcmp(&blk
, &zh
->zh_log
, sizeof (blk
)) == 0);
595 * In one tx, free all log blocks and clear the log header.
596 * If keep_first is set, then we're replaying a log with no content.
597 * We want to keep the first block, however, so that the first
598 * synchronous transaction doesn't require a txg_wait_synced()
599 * in zil_create(). We don't need to txg_wait_synced() here either
600 * when keep_first is set, because both zil_create() and zil_destroy()
601 * will wait for any in-progress destroys to complete.
604 zil_destroy(zilog_t
*zilog
, boolean_t keep_first
)
606 const zil_header_t
*zh
= zilog
->zl_header
;
612 * Wait for any previous destroy to complete.
614 txg_wait_synced(zilog
->zl_dmu_pool
, zilog
->zl_destroy_txg
);
616 zilog
->zl_old_header
= *zh
; /* debugging aid */
618 if (BP_IS_HOLE(&zh
->zh_log
))
621 tx
= dmu_tx_create(zilog
->zl_os
);
622 VERIFY(dmu_tx_assign(tx
, TXG_WAIT
) == 0);
623 dsl_dataset_dirty(dmu_objset_ds(zilog
->zl_os
), tx
);
624 txg
= dmu_tx_get_txg(tx
);
626 mutex_enter(&zilog
->zl_lock
);
628 ASSERT3U(zilog
->zl_destroy_txg
, <, txg
);
629 zilog
->zl_destroy_txg
= txg
;
630 zilog
->zl_keep_first
= keep_first
;
632 if (!list_is_empty(&zilog
->zl_lwb_list
)) {
633 ASSERT(zh
->zh_claim_txg
== 0);
635 while ((lwb
= list_head(&zilog
->zl_lwb_list
)) != NULL
) {
636 ASSERT(lwb
->lwb_zio
== NULL
);
637 if (lwb
->lwb_fastwrite
)
638 metaslab_fastwrite_unmark(zilog
->zl_spa
,
640 list_remove(&zilog
->zl_lwb_list
, lwb
);
641 if (lwb
->lwb_buf
!= NULL
)
642 zio_buf_free(lwb
->lwb_buf
, lwb
->lwb_sz
);
643 zio_free_zil(zilog
->zl_spa
, txg
, &lwb
->lwb_blk
);
644 kmem_cache_free(zil_lwb_cache
, lwb
);
646 } else if (!keep_first
) {
647 zil_destroy_sync(zilog
, tx
);
649 mutex_exit(&zilog
->zl_lock
);
655 zil_destroy_sync(zilog_t
*zilog
, dmu_tx_t
*tx
)
657 ASSERT(list_is_empty(&zilog
->zl_lwb_list
));
658 (void) zil_parse(zilog
, zil_free_log_block
,
659 zil_free_log_record
, tx
, zilog
->zl_header
->zh_claim_txg
);
663 zil_claim(dsl_pool_t
*dp
, dsl_dataset_t
*ds
, void *txarg
)
665 dmu_tx_t
*tx
= txarg
;
666 uint64_t first_txg
= dmu_tx_get_txg(tx
);
672 error
= dmu_objset_own_obj(dp
, ds
->ds_object
,
673 DMU_OST_ANY
, B_FALSE
, FTAG
, &os
);
676 * EBUSY indicates that the objset is inconsistent, in which
677 * case it can not have a ZIL.
679 if (error
!= EBUSY
) {
680 cmn_err(CE_WARN
, "can't open objset for %llu, error %u",
681 (unsigned long long)ds
->ds_object
, error
);
687 zilog
= dmu_objset_zil(os
);
688 zh
= zil_header_in_syncing_context(zilog
);
690 if (spa_get_log_state(zilog
->zl_spa
) == SPA_LOG_CLEAR
) {
691 if (!BP_IS_HOLE(&zh
->zh_log
))
692 zio_free_zil(zilog
->zl_spa
, first_txg
, &zh
->zh_log
);
693 BP_ZERO(&zh
->zh_log
);
694 dsl_dataset_dirty(dmu_objset_ds(os
), tx
);
695 dmu_objset_disown(os
, FTAG
);
700 * Claim all log blocks if we haven't already done so, and remember
701 * the highest claimed sequence number. This ensures that if we can
702 * read only part of the log now (e.g. due to a missing device),
703 * but we can read the entire log later, we will not try to replay
704 * or destroy beyond the last block we successfully claimed.
706 ASSERT3U(zh
->zh_claim_txg
, <=, first_txg
);
707 if (zh
->zh_claim_txg
== 0 && !BP_IS_HOLE(&zh
->zh_log
)) {
708 (void) zil_parse(zilog
, zil_claim_log_block
,
709 zil_claim_log_record
, tx
, first_txg
);
710 zh
->zh_claim_txg
= first_txg
;
711 zh
->zh_claim_blk_seq
= zilog
->zl_parse_blk_seq
;
712 zh
->zh_claim_lr_seq
= zilog
->zl_parse_lr_seq
;
713 if (zilog
->zl_parse_lr_count
|| zilog
->zl_parse_blk_count
> 1)
714 zh
->zh_flags
|= ZIL_REPLAY_NEEDED
;
715 zh
->zh_flags
|= ZIL_CLAIM_LR_SEQ_VALID
;
716 dsl_dataset_dirty(dmu_objset_ds(os
), tx
);
719 ASSERT3U(first_txg
, ==, (spa_last_synced_txg(zilog
->zl_spa
) + 1));
720 dmu_objset_disown(os
, FTAG
);
725 * Check the log by walking the log chain.
726 * Checksum errors are ok as they indicate the end of the chain.
727 * Any other error (no device or read failure) returns an error.
731 zil_check_log_chain(dsl_pool_t
*dp
, dsl_dataset_t
*ds
, void *tx
)
740 error
= dmu_objset_from_ds(ds
, &os
);
742 cmn_err(CE_WARN
, "can't open objset %llu, error %d",
743 (unsigned long long)ds
->ds_object
, error
);
747 zilog
= dmu_objset_zil(os
);
748 bp
= (blkptr_t
*)&zilog
->zl_header
->zh_log
;
751 * Check the first block and determine if it's on a log device
752 * which may have been removed or faulted prior to loading this
753 * pool. If so, there's no point in checking the rest of the log
754 * as its content should have already been synced to the pool.
756 if (!BP_IS_HOLE(bp
)) {
758 boolean_t valid
= B_TRUE
;
760 spa_config_enter(os
->os_spa
, SCL_STATE
, FTAG
, RW_READER
);
761 vd
= vdev_lookup_top(os
->os_spa
, DVA_GET_VDEV(&bp
->blk_dva
[0]));
762 if (vd
->vdev_islog
&& vdev_is_dead(vd
))
763 valid
= vdev_log_state_valid(vd
);
764 spa_config_exit(os
->os_spa
, SCL_STATE
, FTAG
);
771 * Because tx == NULL, zil_claim_log_block() will not actually claim
772 * any blocks, but just determine whether it is possible to do so.
773 * In addition to checking the log chain, zil_claim_log_block()
774 * will invoke zio_claim() with a done func of spa_claim_notify(),
775 * which will update spa_max_claim_txg. See spa_load() for details.
777 error
= zil_parse(zilog
, zil_claim_log_block
, zil_claim_log_record
, tx
,
778 zilog
->zl_header
->zh_claim_txg
? -1ULL : spa_first_txg(os
->os_spa
));
780 return ((error
== ECKSUM
|| error
== ENOENT
) ? 0 : error
);
784 zil_vdev_compare(const void *x1
, const void *x2
)
786 const uint64_t v1
= ((zil_vdev_node_t
*)x1
)->zv_vdev
;
787 const uint64_t v2
= ((zil_vdev_node_t
*)x2
)->zv_vdev
;
798 zil_add_block(zilog_t
*zilog
, const blkptr_t
*bp
)
800 avl_tree_t
*t
= &zilog
->zl_vdev_tree
;
802 zil_vdev_node_t
*zv
, zvsearch
;
803 int ndvas
= BP_GET_NDVAS(bp
);
806 if (zfs_nocacheflush
)
809 ASSERT(zilog
->zl_writer
);
812 * Even though we're zl_writer, we still need a lock because the
813 * zl_get_data() callbacks may have dmu_sync() done callbacks
814 * that will run concurrently.
816 mutex_enter(&zilog
->zl_vdev_lock
);
817 for (i
= 0; i
< ndvas
; i
++) {
818 zvsearch
.zv_vdev
= DVA_GET_VDEV(&bp
->blk_dva
[i
]);
819 if (avl_find(t
, &zvsearch
, &where
) == NULL
) {
820 zv
= kmem_alloc(sizeof (*zv
), KM_SLEEP
);
821 zv
->zv_vdev
= zvsearch
.zv_vdev
;
822 avl_insert(t
, zv
, where
);
825 mutex_exit(&zilog
->zl_vdev_lock
);
829 zil_flush_vdevs(zilog_t
*zilog
)
831 spa_t
*spa
= zilog
->zl_spa
;
832 avl_tree_t
*t
= &zilog
->zl_vdev_tree
;
837 ASSERT(zilog
->zl_writer
);
840 * We don't need zl_vdev_lock here because we're the zl_writer,
841 * and all zl_get_data() callbacks are done.
843 if (avl_numnodes(t
) == 0)
846 spa_config_enter(spa
, SCL_STATE
, FTAG
, RW_READER
);
848 zio
= zio_root(spa
, NULL
, NULL
, ZIO_FLAG_CANFAIL
);
850 while ((zv
= avl_destroy_nodes(t
, &cookie
)) != NULL
) {
851 vdev_t
*vd
= vdev_lookup_top(spa
, zv
->zv_vdev
);
854 kmem_free(zv
, sizeof (*zv
));
858 * Wait for all the flushes to complete. Not all devices actually
859 * support the DKIOCFLUSHWRITECACHE ioctl, so it's OK if it fails.
861 (void) zio_wait(zio
);
863 spa_config_exit(spa
, SCL_STATE
, FTAG
);
867 * Function called when a log block write completes
870 zil_lwb_write_done(zio_t
*zio
)
872 lwb_t
*lwb
= zio
->io_private
;
873 zilog_t
*zilog
= lwb
->lwb_zilog
;
874 dmu_tx_t
*tx
= lwb
->lwb_tx
;
876 ASSERT(BP_GET_COMPRESS(zio
->io_bp
) == ZIO_COMPRESS_OFF
);
877 ASSERT(BP_GET_TYPE(zio
->io_bp
) == DMU_OT_INTENT_LOG
);
878 ASSERT(BP_GET_LEVEL(zio
->io_bp
) == 0);
879 ASSERT(BP_GET_BYTEORDER(zio
->io_bp
) == ZFS_HOST_BYTEORDER
);
880 ASSERT(!BP_IS_GANG(zio
->io_bp
));
881 ASSERT(!BP_IS_HOLE(zio
->io_bp
));
882 ASSERT(BP_GET_FILL(zio
->io_bp
) == 0);
885 * Ensure the lwb buffer pointer is cleared before releasing
886 * the txg. If we have had an allocation failure and
887 * the txg is waiting to sync then we want want zil_sync()
888 * to remove the lwb so that it's not picked up as the next new
889 * one in zil_commit_writer(). zil_sync() will only remove
890 * the lwb if lwb_buf is null.
892 zio_buf_free(lwb
->lwb_buf
, lwb
->lwb_sz
);
893 mutex_enter(&zilog
->zl_lock
);
895 lwb
->lwb_fastwrite
= FALSE
;
898 mutex_exit(&zilog
->zl_lock
);
901 * Now that we've written this log block, we have a stable pointer
902 * to the next block in the chain, so it's OK to let the txg in
903 * which we allocated the next block sync.
909 * Initialize the io for a log block.
912 zil_lwb_write_init(zilog_t
*zilog
, lwb_t
*lwb
)
916 SET_BOOKMARK(&zb
, lwb
->lwb_blk
.blk_cksum
.zc_word
[ZIL_ZC_OBJSET
],
917 ZB_ZIL_OBJECT
, ZB_ZIL_LEVEL
,
918 lwb
->lwb_blk
.blk_cksum
.zc_word
[ZIL_ZC_SEQ
]);
920 if (zilog
->zl_root_zio
== NULL
) {
921 zilog
->zl_root_zio
= zio_root(zilog
->zl_spa
, NULL
, NULL
,
925 /* Lock so zil_sync() doesn't fastwrite_unmark after zio is created */
926 mutex_enter(&zilog
->zl_lock
);
927 if (lwb
->lwb_zio
== NULL
) {
928 if (!lwb
->lwb_fastwrite
) {
929 metaslab_fastwrite_mark(zilog
->zl_spa
, &lwb
->lwb_blk
);
930 lwb
->lwb_fastwrite
= 1;
932 lwb
->lwb_zio
= zio_rewrite(zilog
->zl_root_zio
, zilog
->zl_spa
,
933 0, &lwb
->lwb_blk
, lwb
->lwb_buf
, BP_GET_LSIZE(&lwb
->lwb_blk
),
934 zil_lwb_write_done
, lwb
, ZIO_PRIORITY_SYNC_WRITE
,
935 ZIO_FLAG_CANFAIL
| ZIO_FLAG_DONT_PROPAGATE
|
936 ZIO_FLAG_FASTWRITE
, &zb
);
938 mutex_exit(&zilog
->zl_lock
);
942 * Define a limited set of intent log block sizes.
944 * These must be a multiple of 4KB. Note only the amount used (again
945 * aligned to 4KB) actually gets written. However, we can't always just
946 * allocate SPA_OLD_MAXBLOCKSIZE as the slog space could be exhausted.
948 uint64_t zil_block_buckets
[] = {
949 4096, /* non TX_WRITE */
950 8192+4096, /* data base */
951 32*1024 + 4096, /* NFS writes */
956 * Use the slog as long as the current commit size is less than the
957 * limit or the total list size is less than 2X the limit. Limit
958 * checking is disabled by setting zil_slog_limit to UINT64_MAX.
960 unsigned long zil_slog_limit
= 1024 * 1024;
961 #define USE_SLOG(zilog) (((zilog)->zl_cur_used < zil_slog_limit) || \
962 ((zilog)->zl_itx_list_sz < (zil_slog_limit << 1)))
965 * Start a log block write and advance to the next log block.
966 * Calls are serialized.
969 zil_lwb_write_start(zilog_t
*zilog
, lwb_t
*lwb
)
973 spa_t
*spa
= zilog
->zl_spa
;
977 uint64_t zil_blksz
, wsz
;
981 if (BP_GET_CHECKSUM(&lwb
->lwb_blk
) == ZIO_CHECKSUM_ZILOG2
) {
982 zilc
= (zil_chain_t
*)lwb
->lwb_buf
;
983 bp
= &zilc
->zc_next_blk
;
985 zilc
= (zil_chain_t
*)(lwb
->lwb_buf
+ lwb
->lwb_sz
);
986 bp
= &zilc
->zc_next_blk
;
989 ASSERT(lwb
->lwb_nused
<= lwb
->lwb_sz
);
992 * Allocate the next block and save its address in this block
993 * before writing it in order to establish the log chain.
994 * Note that if the allocation of nlwb synced before we wrote
995 * the block that points at it (lwb), we'd leak it if we crashed.
996 * Therefore, we don't do dmu_tx_commit() until zil_lwb_write_done().
997 * We dirty the dataset to ensure that zil_sync() will be called
998 * to clean up in the event of allocation failure or I/O failure.
1000 tx
= dmu_tx_create(zilog
->zl_os
);
1001 VERIFY(dmu_tx_assign(tx
, TXG_WAIT
) == 0);
1002 dsl_dataset_dirty(dmu_objset_ds(zilog
->zl_os
), tx
);
1003 txg
= dmu_tx_get_txg(tx
);
1008 * Log blocks are pre-allocated. Here we select the size of the next
1009 * block, based on size used in the last block.
1010 * - first find the smallest bucket that will fit the block from a
1011 * limited set of block sizes. This is because it's faster to write
1012 * blocks allocated from the same metaslab as they are adjacent or
1014 * - next find the maximum from the new suggested size and an array of
1015 * previous sizes. This lessens a picket fence effect of wrongly
1016 * guesssing the size if we have a stream of say 2k, 64k, 2k, 64k
1019 * Note we only write what is used, but we can't just allocate
1020 * the maximum block size because we can exhaust the available
1023 zil_blksz
= zilog
->zl_cur_used
+ sizeof (zil_chain_t
);
1024 for (i
= 0; zil_blksz
> zil_block_buckets
[i
]; i
++)
1026 zil_blksz
= zil_block_buckets
[i
];
1027 if (zil_blksz
== UINT64_MAX
)
1028 zil_blksz
= SPA_OLD_MAXBLOCKSIZE
;
1029 zilog
->zl_prev_blks
[zilog
->zl_prev_rotor
] = zil_blksz
;
1030 for (i
= 0; i
< ZIL_PREV_BLKS
; i
++)
1031 zil_blksz
= MAX(zil_blksz
, zilog
->zl_prev_blks
[i
]);
1032 zilog
->zl_prev_rotor
= (zilog
->zl_prev_rotor
+ 1) & (ZIL_PREV_BLKS
- 1);
1035 use_slog
= USE_SLOG(zilog
);
1036 error
= zio_alloc_zil(spa
, txg
, bp
, zil_blksz
,
1039 ZIL_STAT_BUMP(zil_itx_metaslab_slog_count
);
1040 ZIL_STAT_INCR(zil_itx_metaslab_slog_bytes
, lwb
->lwb_nused
);
1042 ZIL_STAT_BUMP(zil_itx_metaslab_normal_count
);
1043 ZIL_STAT_INCR(zil_itx_metaslab_normal_bytes
, lwb
->lwb_nused
);
1046 ASSERT3U(bp
->blk_birth
, ==, txg
);
1047 bp
->blk_cksum
= lwb
->lwb_blk
.blk_cksum
;
1048 bp
->blk_cksum
.zc_word
[ZIL_ZC_SEQ
]++;
1051 * Allocate a new log write buffer (lwb).
1053 nlwb
= zil_alloc_lwb(zilog
, bp
, txg
, TRUE
);
1055 /* Record the block for later vdev flushing */
1056 zil_add_block(zilog
, &lwb
->lwb_blk
);
1059 if (BP_GET_CHECKSUM(&lwb
->lwb_blk
) == ZIO_CHECKSUM_ZILOG2
) {
1060 /* For Slim ZIL only write what is used. */
1061 wsz
= P2ROUNDUP_TYPED(lwb
->lwb_nused
, ZIL_MIN_BLKSZ
, uint64_t);
1062 ASSERT3U(wsz
, <=, lwb
->lwb_sz
);
1063 zio_shrink(lwb
->lwb_zio
, wsz
);
1070 zilc
->zc_nused
= lwb
->lwb_nused
;
1071 zilc
->zc_eck
.zec_cksum
= lwb
->lwb_blk
.blk_cksum
;
1074 * clear unused data for security
1076 bzero(lwb
->lwb_buf
+ lwb
->lwb_nused
, wsz
- lwb
->lwb_nused
);
1078 zio_nowait(lwb
->lwb_zio
); /* Kick off the write for the old log block */
1081 * If there was an allocation failure then nlwb will be null which
1082 * forces a txg_wait_synced().
1088 zil_lwb_commit(zilog_t
*zilog
, itx_t
*itx
, lwb_t
*lwb
)
1090 lr_t
*lrc
= &itx
->itx_lr
; /* common log record */
1091 lr_write_t
*lrw
= (lr_write_t
*)lrc
;
1093 uint64_t txg
= lrc
->lrc_txg
;
1094 uint64_t reclen
= lrc
->lrc_reclen
;
1100 ASSERT(lwb
->lwb_buf
!= NULL
);
1101 ASSERT(zilog_is_dirty(zilog
) ||
1102 spa_freeze_txg(zilog
->zl_spa
) != UINT64_MAX
);
1104 if (lrc
->lrc_txtype
== TX_WRITE
&& itx
->itx_wr_state
== WR_NEED_COPY
)
1105 dlen
= P2ROUNDUP_TYPED(
1106 lrw
->lr_length
, sizeof (uint64_t), uint64_t);
1108 zilog
->zl_cur_used
+= (reclen
+ dlen
);
1110 zil_lwb_write_init(zilog
, lwb
);
1113 * If this record won't fit in the current log block, start a new one.
1115 if (lwb
->lwb_nused
+ reclen
+ dlen
> lwb
->lwb_sz
) {
1116 lwb
= zil_lwb_write_start(zilog
, lwb
);
1119 zil_lwb_write_init(zilog
, lwb
);
1120 ASSERT(LWB_EMPTY(lwb
));
1121 if (lwb
->lwb_nused
+ reclen
+ dlen
> lwb
->lwb_sz
) {
1122 txg_wait_synced(zilog
->zl_dmu_pool
, txg
);
1127 lr_buf
= lwb
->lwb_buf
+ lwb
->lwb_nused
;
1128 bcopy(lrc
, lr_buf
, reclen
);
1129 lrc
= (lr_t
*)lr_buf
;
1130 lrw
= (lr_write_t
*)lrc
;
1132 ZIL_STAT_BUMP(zil_itx_count
);
1135 * If it's a write, fetch the data or get its blkptr as appropriate.
1137 if (lrc
->lrc_txtype
== TX_WRITE
) {
1138 if (txg
> spa_freeze_txg(zilog
->zl_spa
))
1139 txg_wait_synced(zilog
->zl_dmu_pool
, txg
);
1140 if (itx
->itx_wr_state
== WR_COPIED
) {
1141 ZIL_STAT_BUMP(zil_itx_copied_count
);
1142 ZIL_STAT_INCR(zil_itx_copied_bytes
, lrw
->lr_length
);
1148 ASSERT(itx
->itx_wr_state
== WR_NEED_COPY
);
1149 dbuf
= lr_buf
+ reclen
;
1150 lrw
->lr_common
.lrc_reclen
+= dlen
;
1151 ZIL_STAT_BUMP(zil_itx_needcopy_count
);
1152 ZIL_STAT_INCR(zil_itx_needcopy_bytes
,
1155 ASSERT(itx
->itx_wr_state
== WR_INDIRECT
);
1157 ZIL_STAT_BUMP(zil_itx_indirect_count
);
1158 ZIL_STAT_INCR(zil_itx_indirect_bytes
,
1161 error
= zilog
->zl_get_data(
1162 itx
->itx_private
, lrw
, dbuf
, lwb
->lwb_zio
);
1164 txg_wait_synced(zilog
->zl_dmu_pool
, txg
);
1168 ASSERT(error
== ENOENT
|| error
== EEXIST
||
1176 * We're actually making an entry, so update lrc_seq to be the
1177 * log record sequence number. Note that this is generally not
1178 * equal to the itx sequence number because not all transactions
1179 * are synchronous, and sometimes spa_sync() gets there first.
1181 lrc
->lrc_seq
= ++zilog
->zl_lr_seq
; /* we are single threaded */
1182 lwb
->lwb_nused
+= reclen
+ dlen
;
1183 lwb
->lwb_max_txg
= MAX(lwb
->lwb_max_txg
, txg
);
1184 ASSERT3U(lwb
->lwb_nused
, <=, lwb
->lwb_sz
);
1185 ASSERT0(P2PHASE(lwb
->lwb_nused
, sizeof (uint64_t)));
1191 zil_itx_create(uint64_t txtype
, size_t lrsize
)
1195 lrsize
= P2ROUNDUP_TYPED(lrsize
, sizeof (uint64_t), size_t);
1197 itx
= zio_data_buf_alloc(offsetof(itx_t
, itx_lr
) + lrsize
);
1198 itx
->itx_lr
.lrc_txtype
= txtype
;
1199 itx
->itx_lr
.lrc_reclen
= lrsize
;
1200 itx
->itx_sod
= lrsize
; /* if write & WR_NEED_COPY will be increased */
1201 itx
->itx_lr
.lrc_seq
= 0; /* defensive */
1202 itx
->itx_sync
= B_TRUE
; /* default is synchronous */
1203 itx
->itx_callback
= NULL
;
1204 itx
->itx_callback_data
= NULL
;
1210 zil_itx_destroy(itx_t
*itx
)
1212 zio_data_buf_free(itx
, offsetof(itx_t
, itx_lr
)+itx
->itx_lr
.lrc_reclen
);
1216 * Free up the sync and async itxs. The itxs_t has already been detached
1217 * so no locks are needed.
1220 zil_itxg_clean(itxs_t
*itxs
)
1226 itx_async_node_t
*ian
;
1228 list
= &itxs
->i_sync_list
;
1229 while ((itx
= list_head(list
)) != NULL
) {
1230 if (itx
->itx_callback
!= NULL
)
1231 itx
->itx_callback(itx
->itx_callback_data
);
1232 list_remove(list
, itx
);
1233 zil_itx_destroy(itx
);
1237 t
= &itxs
->i_async_tree
;
1238 while ((ian
= avl_destroy_nodes(t
, &cookie
)) != NULL
) {
1239 list
= &ian
->ia_list
;
1240 while ((itx
= list_head(list
)) != NULL
) {
1241 if (itx
->itx_callback
!= NULL
)
1242 itx
->itx_callback(itx
->itx_callback_data
);
1243 list_remove(list
, itx
);
1244 zil_itx_destroy(itx
);
1247 kmem_free(ian
, sizeof (itx_async_node_t
));
1251 kmem_free(itxs
, sizeof (itxs_t
));
1255 zil_aitx_compare(const void *x1
, const void *x2
)
1257 const uint64_t o1
= ((itx_async_node_t
*)x1
)->ia_foid
;
1258 const uint64_t o2
= ((itx_async_node_t
*)x2
)->ia_foid
;
1269 * Remove all async itx with the given oid.
1272 zil_remove_async(zilog_t
*zilog
, uint64_t oid
)
1275 itx_async_node_t
*ian
;
1282 list_create(&clean_list
, sizeof (itx_t
), offsetof(itx_t
, itx_node
));
1284 if (spa_freeze_txg(zilog
->zl_spa
) != UINT64_MAX
) /* ziltest support */
1287 otxg
= spa_last_synced_txg(zilog
->zl_spa
) + 1;
1289 for (txg
= otxg
; txg
< (otxg
+ TXG_CONCURRENT_STATES
); txg
++) {
1290 itxg_t
*itxg
= &zilog
->zl_itxg
[txg
& TXG_MASK
];
1292 mutex_enter(&itxg
->itxg_lock
);
1293 if (itxg
->itxg_txg
!= txg
) {
1294 mutex_exit(&itxg
->itxg_lock
);
1299 * Locate the object node and append its list.
1301 t
= &itxg
->itxg_itxs
->i_async_tree
;
1302 ian
= avl_find(t
, &oid
, &where
);
1304 list_move_tail(&clean_list
, &ian
->ia_list
);
1305 mutex_exit(&itxg
->itxg_lock
);
1307 while ((itx
= list_head(&clean_list
)) != NULL
) {
1308 if (itx
->itx_callback
!= NULL
)
1309 itx
->itx_callback(itx
->itx_callback_data
);
1310 list_remove(&clean_list
, itx
);
1311 zil_itx_destroy(itx
);
1313 list_destroy(&clean_list
);
1317 zil_itx_assign(zilog_t
*zilog
, itx_t
*itx
, dmu_tx_t
*tx
)
1321 itxs_t
*itxs
, *clean
= NULL
;
1324 * Object ids can be re-instantiated in the next txg so
1325 * remove any async transactions to avoid future leaks.
1326 * This can happen if a fsync occurs on the re-instantiated
1327 * object for a WR_INDIRECT or WR_NEED_COPY write, which gets
1328 * the new file data and flushes a write record for the old object.
1330 if ((itx
->itx_lr
.lrc_txtype
& ~TX_CI
) == TX_REMOVE
)
1331 zil_remove_async(zilog
, itx
->itx_oid
);
1334 * Ensure the data of a renamed file is committed before the rename.
1336 if ((itx
->itx_lr
.lrc_txtype
& ~TX_CI
) == TX_RENAME
)
1337 zil_async_to_sync(zilog
, itx
->itx_oid
);
1339 if (spa_freeze_txg(zilog
->zl_spa
) != UINT64_MAX
)
1342 txg
= dmu_tx_get_txg(tx
);
1344 itxg
= &zilog
->zl_itxg
[txg
& TXG_MASK
];
1345 mutex_enter(&itxg
->itxg_lock
);
1346 itxs
= itxg
->itxg_itxs
;
1347 if (itxg
->itxg_txg
!= txg
) {
1350 * The zil_clean callback hasn't got around to cleaning
1351 * this itxg. Save the itxs for release below.
1352 * This should be rare.
1354 atomic_add_64(&zilog
->zl_itx_list_sz
, -itxg
->itxg_sod
);
1356 clean
= itxg
->itxg_itxs
;
1358 ASSERT(itxg
->itxg_sod
== 0);
1359 itxg
->itxg_txg
= txg
;
1360 itxs
= itxg
->itxg_itxs
= kmem_zalloc(sizeof (itxs_t
),
1363 list_create(&itxs
->i_sync_list
, sizeof (itx_t
),
1364 offsetof(itx_t
, itx_node
));
1365 avl_create(&itxs
->i_async_tree
, zil_aitx_compare
,
1366 sizeof (itx_async_node_t
),
1367 offsetof(itx_async_node_t
, ia_node
));
1369 if (itx
->itx_sync
) {
1370 list_insert_tail(&itxs
->i_sync_list
, itx
);
1371 atomic_add_64(&zilog
->zl_itx_list_sz
, itx
->itx_sod
);
1372 itxg
->itxg_sod
+= itx
->itx_sod
;
1374 avl_tree_t
*t
= &itxs
->i_async_tree
;
1376 LR_FOID_GET_OBJ(((lr_ooo_t
*)&itx
->itx_lr
)->lr_foid
);
1377 itx_async_node_t
*ian
;
1380 ian
= avl_find(t
, &foid
, &where
);
1382 ian
= kmem_alloc(sizeof (itx_async_node_t
),
1384 list_create(&ian
->ia_list
, sizeof (itx_t
),
1385 offsetof(itx_t
, itx_node
));
1386 ian
->ia_foid
= foid
;
1387 avl_insert(t
, ian
, where
);
1389 list_insert_tail(&ian
->ia_list
, itx
);
1392 itx
->itx_lr
.lrc_txg
= dmu_tx_get_txg(tx
);
1393 zilog_dirty(zilog
, txg
);
1394 mutex_exit(&itxg
->itxg_lock
);
1396 /* Release the old itxs now we've dropped the lock */
1398 zil_itxg_clean(clean
);
1402 * If there are any in-memory intent log transactions which have now been
1403 * synced then start up a taskq to free them. We should only do this after we
1404 * have written out the uberblocks (i.e. txg has been comitted) so that
1405 * don't inadvertently clean out in-memory log records that would be required
1409 zil_clean(zilog_t
*zilog
, uint64_t synced_txg
)
1411 itxg_t
*itxg
= &zilog
->zl_itxg
[synced_txg
& TXG_MASK
];
1414 mutex_enter(&itxg
->itxg_lock
);
1415 if (itxg
->itxg_itxs
== NULL
|| itxg
->itxg_txg
== ZILTEST_TXG
) {
1416 mutex_exit(&itxg
->itxg_lock
);
1419 ASSERT3U(itxg
->itxg_txg
, <=, synced_txg
);
1420 ASSERT(itxg
->itxg_txg
!= 0);
1421 ASSERT(zilog
->zl_clean_taskq
!= NULL
);
1422 atomic_add_64(&zilog
->zl_itx_list_sz
, -itxg
->itxg_sod
);
1424 clean_me
= itxg
->itxg_itxs
;
1425 itxg
->itxg_itxs
= NULL
;
1427 mutex_exit(&itxg
->itxg_lock
);
1429 * Preferably start a task queue to free up the old itxs but
1430 * if taskq_dispatch can't allocate resources to do that then
1431 * free it in-line. This should be rare. Note, using TQ_SLEEP
1432 * created a bad performance problem.
1434 if (taskq_dispatch(zilog
->zl_clean_taskq
,
1435 (void (*)(void *))zil_itxg_clean
, clean_me
, TQ_NOSLEEP
) == 0)
1436 zil_itxg_clean(clean_me
);
1440 * Get the list of itxs to commit into zl_itx_commit_list.
1443 zil_get_commit_list(zilog_t
*zilog
)
1446 list_t
*commit_list
= &zilog
->zl_itx_commit_list
;
1447 uint64_t push_sod
= 0;
1449 if (spa_freeze_txg(zilog
->zl_spa
) != UINT64_MAX
) /* ziltest support */
1452 otxg
= spa_last_synced_txg(zilog
->zl_spa
) + 1;
1454 for (txg
= otxg
; txg
< (otxg
+ TXG_CONCURRENT_STATES
); txg
++) {
1455 itxg_t
*itxg
= &zilog
->zl_itxg
[txg
& TXG_MASK
];
1457 mutex_enter(&itxg
->itxg_lock
);
1458 if (itxg
->itxg_txg
!= txg
) {
1459 mutex_exit(&itxg
->itxg_lock
);
1463 list_move_tail(commit_list
, &itxg
->itxg_itxs
->i_sync_list
);
1464 push_sod
+= itxg
->itxg_sod
;
1467 mutex_exit(&itxg
->itxg_lock
);
1469 atomic_add_64(&zilog
->zl_itx_list_sz
, -push_sod
);
1473 * Move the async itxs for a specified object to commit into sync lists.
1476 zil_async_to_sync(zilog_t
*zilog
, uint64_t foid
)
1479 itx_async_node_t
*ian
;
1483 if (spa_freeze_txg(zilog
->zl_spa
) != UINT64_MAX
) /* ziltest support */
1486 otxg
= spa_last_synced_txg(zilog
->zl_spa
) + 1;
1488 for (txg
= otxg
; txg
< (otxg
+ TXG_CONCURRENT_STATES
); txg
++) {
1489 itxg_t
*itxg
= &zilog
->zl_itxg
[txg
& TXG_MASK
];
1491 mutex_enter(&itxg
->itxg_lock
);
1492 if (itxg
->itxg_txg
!= txg
) {
1493 mutex_exit(&itxg
->itxg_lock
);
1498 * If a foid is specified then find that node and append its
1499 * list. Otherwise walk the tree appending all the lists
1500 * to the sync list. We add to the end rather than the
1501 * beginning to ensure the create has happened.
1503 t
= &itxg
->itxg_itxs
->i_async_tree
;
1505 ian
= avl_find(t
, &foid
, &where
);
1507 list_move_tail(&itxg
->itxg_itxs
->i_sync_list
,
1511 void *cookie
= NULL
;
1513 while ((ian
= avl_destroy_nodes(t
, &cookie
)) != NULL
) {
1514 list_move_tail(&itxg
->itxg_itxs
->i_sync_list
,
1516 list_destroy(&ian
->ia_list
);
1517 kmem_free(ian
, sizeof (itx_async_node_t
));
1520 mutex_exit(&itxg
->itxg_lock
);
1525 zil_commit_writer(zilog_t
*zilog
)
1530 spa_t
*spa
= zilog
->zl_spa
;
1533 ASSERT(zilog
->zl_root_zio
== NULL
);
1535 mutex_exit(&zilog
->zl_lock
);
1537 zil_get_commit_list(zilog
);
1540 * Return if there's nothing to commit before we dirty the fs by
1541 * calling zil_create().
1543 if (list_head(&zilog
->zl_itx_commit_list
) == NULL
) {
1544 mutex_enter(&zilog
->zl_lock
);
1548 if (zilog
->zl_suspend
) {
1551 lwb
= list_tail(&zilog
->zl_lwb_list
);
1553 lwb
= zil_create(zilog
);
1556 DTRACE_PROBE1(zil__cw1
, zilog_t
*, zilog
);
1557 for (itx
= list_head(&zilog
->zl_itx_commit_list
); itx
!= NULL
;
1558 itx
= list_next(&zilog
->zl_itx_commit_list
, itx
)) {
1559 txg
= itx
->itx_lr
.lrc_txg
;
1562 if (txg
> spa_last_synced_txg(spa
) || txg
> spa_freeze_txg(spa
))
1563 lwb
= zil_lwb_commit(zilog
, itx
, lwb
);
1565 DTRACE_PROBE1(zil__cw2
, zilog_t
*, zilog
);
1567 /* write the last block out */
1568 if (lwb
!= NULL
&& lwb
->lwb_zio
!= NULL
)
1569 lwb
= zil_lwb_write_start(zilog
, lwb
);
1571 zilog
->zl_cur_used
= 0;
1574 * Wait if necessary for the log blocks to be on stable storage.
1576 if (zilog
->zl_root_zio
) {
1577 error
= zio_wait(zilog
->zl_root_zio
);
1578 zilog
->zl_root_zio
= NULL
;
1579 zil_flush_vdevs(zilog
);
1582 if (error
|| lwb
== NULL
)
1583 txg_wait_synced(zilog
->zl_dmu_pool
, 0);
1585 while ((itx
= list_head(&zilog
->zl_itx_commit_list
))) {
1586 txg
= itx
->itx_lr
.lrc_txg
;
1589 if (itx
->itx_callback
!= NULL
)
1590 itx
->itx_callback(itx
->itx_callback_data
);
1591 list_remove(&zilog
->zl_itx_commit_list
, itx
);
1592 zil_itx_destroy(itx
);
1595 mutex_enter(&zilog
->zl_lock
);
1598 * Remember the highest committed log sequence number for ztest.
1599 * We only update this value when all the log writes succeeded,
1600 * because ztest wants to ASSERT that it got the whole log chain.
1602 if (error
== 0 && lwb
!= NULL
)
1603 zilog
->zl_commit_lr_seq
= zilog
->zl_lr_seq
;
1607 * Commit zfs transactions to stable storage.
1608 * If foid is 0 push out all transactions, otherwise push only those
1609 * for that object or might reference that object.
1611 * itxs are committed in batches. In a heavily stressed zil there will be
1612 * a commit writer thread who is writing out a bunch of itxs to the log
1613 * for a set of committing threads (cthreads) in the same batch as the writer.
1614 * Those cthreads are all waiting on the same cv for that batch.
1616 * There will also be a different and growing batch of threads that are
1617 * waiting to commit (qthreads). When the committing batch completes
1618 * a transition occurs such that the cthreads exit and the qthreads become
1619 * cthreads. One of the new cthreads becomes the writer thread for the
1620 * batch. Any new threads arriving become new qthreads.
1622 * Only 2 condition variables are needed and there's no transition
1623 * between the two cvs needed. They just flip-flop between qthreads
1626 * Using this scheme we can efficiently wakeup up only those threads
1627 * that have been committed.
1630 zil_commit(zilog_t
*zilog
, uint64_t foid
)
1634 if (zilog
->zl_sync
== ZFS_SYNC_DISABLED
)
1637 ZIL_STAT_BUMP(zil_commit_count
);
1639 /* move the async itxs for the foid to the sync queues */
1640 zil_async_to_sync(zilog
, foid
);
1642 mutex_enter(&zilog
->zl_lock
);
1643 mybatch
= zilog
->zl_next_batch
;
1644 while (zilog
->zl_writer
) {
1645 cv_wait(&zilog
->zl_cv_batch
[mybatch
& 1], &zilog
->zl_lock
);
1646 if (mybatch
<= zilog
->zl_com_batch
) {
1647 mutex_exit(&zilog
->zl_lock
);
1652 zilog
->zl_next_batch
++;
1653 zilog
->zl_writer
= B_TRUE
;
1654 ZIL_STAT_BUMP(zil_commit_writer_count
);
1655 zil_commit_writer(zilog
);
1656 zilog
->zl_com_batch
= mybatch
;
1657 zilog
->zl_writer
= B_FALSE
;
1659 /* wake up one thread to become the next writer */
1660 cv_signal(&zilog
->zl_cv_batch
[(mybatch
+1) & 1]);
1662 /* wake up all threads waiting for this batch to be committed */
1663 cv_broadcast(&zilog
->zl_cv_batch
[mybatch
& 1]);
1665 mutex_exit(&zilog
->zl_lock
);
1669 * Called in syncing context to free committed log blocks and update log header.
1672 zil_sync(zilog_t
*zilog
, dmu_tx_t
*tx
)
1674 zil_header_t
*zh
= zil_header_in_syncing_context(zilog
);
1675 uint64_t txg
= dmu_tx_get_txg(tx
);
1676 spa_t
*spa
= zilog
->zl_spa
;
1677 uint64_t *replayed_seq
= &zilog
->zl_replayed_seq
[txg
& TXG_MASK
];
1681 * We don't zero out zl_destroy_txg, so make sure we don't try
1682 * to destroy it twice.
1684 if (spa_sync_pass(spa
) != 1)
1687 mutex_enter(&zilog
->zl_lock
);
1689 ASSERT(zilog
->zl_stop_sync
== 0);
1691 if (*replayed_seq
!= 0) {
1692 ASSERT(zh
->zh_replay_seq
< *replayed_seq
);
1693 zh
->zh_replay_seq
= *replayed_seq
;
1697 if (zilog
->zl_destroy_txg
== txg
) {
1698 blkptr_t blk
= zh
->zh_log
;
1700 ASSERT(list_head(&zilog
->zl_lwb_list
) == NULL
);
1702 bzero(zh
, sizeof (zil_header_t
));
1703 bzero(zilog
->zl_replayed_seq
, sizeof (zilog
->zl_replayed_seq
));
1705 if (zilog
->zl_keep_first
) {
1707 * If this block was part of log chain that couldn't
1708 * be claimed because a device was missing during
1709 * zil_claim(), but that device later returns,
1710 * then this block could erroneously appear valid.
1711 * To guard against this, assign a new GUID to the new
1712 * log chain so it doesn't matter what blk points to.
1714 zil_init_log_chain(zilog
, &blk
);
1719 while ((lwb
= list_head(&zilog
->zl_lwb_list
)) != NULL
) {
1720 zh
->zh_log
= lwb
->lwb_blk
;
1721 if (lwb
->lwb_buf
!= NULL
|| lwb
->lwb_max_txg
> txg
)
1724 ASSERT(lwb
->lwb_zio
== NULL
);
1726 list_remove(&zilog
->zl_lwb_list
, lwb
);
1727 zio_free_zil(spa
, txg
, &lwb
->lwb_blk
);
1728 kmem_cache_free(zil_lwb_cache
, lwb
);
1731 * If we don't have anything left in the lwb list then
1732 * we've had an allocation failure and we need to zero
1733 * out the zil_header blkptr so that we don't end
1734 * up freeing the same block twice.
1736 if (list_head(&zilog
->zl_lwb_list
) == NULL
)
1737 BP_ZERO(&zh
->zh_log
);
1741 * Remove fastwrite on any blocks that have been pre-allocated for
1742 * the next commit. This prevents fastwrite counter pollution by
1743 * unused, long-lived LWBs.
1745 for (; lwb
!= NULL
; lwb
= list_next(&zilog
->zl_lwb_list
, lwb
)) {
1746 if (lwb
->lwb_fastwrite
&& !lwb
->lwb_zio
) {
1747 metaslab_fastwrite_unmark(zilog
->zl_spa
, &lwb
->lwb_blk
);
1748 lwb
->lwb_fastwrite
= 0;
1752 mutex_exit(&zilog
->zl_lock
);
1758 zil_lwb_cache
= kmem_cache_create("zil_lwb_cache",
1759 sizeof (struct lwb
), 0, NULL
, NULL
, NULL
, NULL
, NULL
, 0);
1761 zil_ksp
= kstat_create("zfs", 0, "zil", "misc",
1762 KSTAT_TYPE_NAMED
, sizeof (zil_stats
) / sizeof (kstat_named_t
),
1763 KSTAT_FLAG_VIRTUAL
);
1765 if (zil_ksp
!= NULL
) {
1766 zil_ksp
->ks_data
= &zil_stats
;
1767 kstat_install(zil_ksp
);
1774 kmem_cache_destroy(zil_lwb_cache
);
1776 if (zil_ksp
!= NULL
) {
1777 kstat_delete(zil_ksp
);
1783 zil_set_sync(zilog_t
*zilog
, uint64_t sync
)
1785 zilog
->zl_sync
= sync
;
1789 zil_set_logbias(zilog_t
*zilog
, uint64_t logbias
)
1791 zilog
->zl_logbias
= logbias
;
1795 zil_alloc(objset_t
*os
, zil_header_t
*zh_phys
)
1800 zilog
= kmem_zalloc(sizeof (zilog_t
), KM_SLEEP
);
1802 zilog
->zl_header
= zh_phys
;
1804 zilog
->zl_spa
= dmu_objset_spa(os
);
1805 zilog
->zl_dmu_pool
= dmu_objset_pool(os
);
1806 zilog
->zl_destroy_txg
= TXG_INITIAL
- 1;
1807 zilog
->zl_logbias
= dmu_objset_logbias(os
);
1808 zilog
->zl_sync
= dmu_objset_syncprop(os
);
1809 zilog
->zl_next_batch
= 1;
1811 mutex_init(&zilog
->zl_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1813 for (i
= 0; i
< TXG_SIZE
; i
++) {
1814 mutex_init(&zilog
->zl_itxg
[i
].itxg_lock
, NULL
,
1815 MUTEX_DEFAULT
, NULL
);
1818 list_create(&zilog
->zl_lwb_list
, sizeof (lwb_t
),
1819 offsetof(lwb_t
, lwb_node
));
1821 list_create(&zilog
->zl_itx_commit_list
, sizeof (itx_t
),
1822 offsetof(itx_t
, itx_node
));
1824 mutex_init(&zilog
->zl_vdev_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
1826 avl_create(&zilog
->zl_vdev_tree
, zil_vdev_compare
,
1827 sizeof (zil_vdev_node_t
), offsetof(zil_vdev_node_t
, zv_node
));
1829 cv_init(&zilog
->zl_cv_writer
, NULL
, CV_DEFAULT
, NULL
);
1830 cv_init(&zilog
->zl_cv_suspend
, NULL
, CV_DEFAULT
, NULL
);
1831 cv_init(&zilog
->zl_cv_batch
[0], NULL
, CV_DEFAULT
, NULL
);
1832 cv_init(&zilog
->zl_cv_batch
[1], NULL
, CV_DEFAULT
, NULL
);
1838 zil_free(zilog_t
*zilog
)
1842 zilog
->zl_stop_sync
= 1;
1844 ASSERT0(zilog
->zl_suspend
);
1845 ASSERT0(zilog
->zl_suspending
);
1847 ASSERT(list_is_empty(&zilog
->zl_lwb_list
));
1848 list_destroy(&zilog
->zl_lwb_list
);
1850 avl_destroy(&zilog
->zl_vdev_tree
);
1851 mutex_destroy(&zilog
->zl_vdev_lock
);
1853 ASSERT(list_is_empty(&zilog
->zl_itx_commit_list
));
1854 list_destroy(&zilog
->zl_itx_commit_list
);
1856 for (i
= 0; i
< TXG_SIZE
; i
++) {
1858 * It's possible for an itx to be generated that doesn't dirty
1859 * a txg (e.g. ztest TX_TRUNCATE). So there's no zil_clean()
1860 * callback to remove the entry. We remove those here.
1862 * Also free up the ziltest itxs.
1864 if (zilog
->zl_itxg
[i
].itxg_itxs
)
1865 zil_itxg_clean(zilog
->zl_itxg
[i
].itxg_itxs
);
1866 mutex_destroy(&zilog
->zl_itxg
[i
].itxg_lock
);
1869 mutex_destroy(&zilog
->zl_lock
);
1871 cv_destroy(&zilog
->zl_cv_writer
);
1872 cv_destroy(&zilog
->zl_cv_suspend
);
1873 cv_destroy(&zilog
->zl_cv_batch
[0]);
1874 cv_destroy(&zilog
->zl_cv_batch
[1]);
1876 kmem_free(zilog
, sizeof (zilog_t
));
1880 * Open an intent log.
1883 zil_open(objset_t
*os
, zil_get_data_t
*get_data
)
1885 zilog_t
*zilog
= dmu_objset_zil(os
);
1887 ASSERT(zilog
->zl_clean_taskq
== NULL
);
1888 ASSERT(zilog
->zl_get_data
== NULL
);
1889 ASSERT(list_is_empty(&zilog
->zl_lwb_list
));
1891 zilog
->zl_get_data
= get_data
;
1892 zilog
->zl_clean_taskq
= taskq_create("zil_clean", 1, defclsyspri
,
1893 2, 2, TASKQ_PREPOPULATE
);
1899 * Close an intent log.
1902 zil_close(zilog_t
*zilog
)
1907 zil_commit(zilog
, 0); /* commit all itx */
1910 * The lwb_max_txg for the stubby lwb will reflect the last activity
1911 * for the zil. After a txg_wait_synced() on the txg we know all the
1912 * callbacks have occurred that may clean the zil. Only then can we
1913 * destroy the zl_clean_taskq.
1915 mutex_enter(&zilog
->zl_lock
);
1916 lwb
= list_tail(&zilog
->zl_lwb_list
);
1918 txg
= lwb
->lwb_max_txg
;
1919 mutex_exit(&zilog
->zl_lock
);
1921 txg_wait_synced(zilog
->zl_dmu_pool
, txg
);
1922 if (txg
< spa_freeze_txg(zilog
->zl_spa
))
1923 ASSERT(!zilog_is_dirty(zilog
));
1925 taskq_destroy(zilog
->zl_clean_taskq
);
1926 zilog
->zl_clean_taskq
= NULL
;
1927 zilog
->zl_get_data
= NULL
;
1930 * We should have only one LWB left on the list; remove it now.
1932 mutex_enter(&zilog
->zl_lock
);
1933 lwb
= list_head(&zilog
->zl_lwb_list
);
1935 ASSERT(lwb
== list_tail(&zilog
->zl_lwb_list
));
1936 ASSERT(lwb
->lwb_zio
== NULL
);
1937 if (lwb
->lwb_fastwrite
)
1938 metaslab_fastwrite_unmark(zilog
->zl_spa
, &lwb
->lwb_blk
);
1939 list_remove(&zilog
->zl_lwb_list
, lwb
);
1940 zio_buf_free(lwb
->lwb_buf
, lwb
->lwb_sz
);
1941 kmem_cache_free(zil_lwb_cache
, lwb
);
1943 mutex_exit(&zilog
->zl_lock
);
1946 static char *suspend_tag
= "zil suspending";
1949 * Suspend an intent log. While in suspended mode, we still honor
1950 * synchronous semantics, but we rely on txg_wait_synced() to do it.
1951 * On old version pools, we suspend the log briefly when taking a
1952 * snapshot so that it will have an empty intent log.
1954 * Long holds are not really intended to be used the way we do here --
1955 * held for such a short time. A concurrent caller of dsl_dataset_long_held()
1956 * could fail. Therefore we take pains to only put a long hold if it is
1957 * actually necessary. Fortunately, it will only be necessary if the
1958 * objset is currently mounted (or the ZVOL equivalent). In that case it
1959 * will already have a long hold, so we are not really making things any worse.
1961 * Ideally, we would locate the existing long-holder (i.e. the zfsvfs_t or
1962 * zvol_state_t), and use their mechanism to prevent their hold from being
1963 * dropped (e.g. VFS_HOLD()). However, that would be even more pain for
1966 * if cookiep == NULL, this does both the suspend & resume.
1967 * Otherwise, it returns with the dataset "long held", and the cookie
1968 * should be passed into zil_resume().
1971 zil_suspend(const char *osname
, void **cookiep
)
1975 const zil_header_t
*zh
;
1978 error
= dmu_objset_hold(osname
, suspend_tag
, &os
);
1981 zilog
= dmu_objset_zil(os
);
1983 mutex_enter(&zilog
->zl_lock
);
1984 zh
= zilog
->zl_header
;
1986 if (zh
->zh_flags
& ZIL_REPLAY_NEEDED
) { /* unplayed log */
1987 mutex_exit(&zilog
->zl_lock
);
1988 dmu_objset_rele(os
, suspend_tag
);
1989 return (SET_ERROR(EBUSY
));
1993 * Don't put a long hold in the cases where we can avoid it. This
1994 * is when there is no cookie so we are doing a suspend & resume
1995 * (i.e. called from zil_vdev_offline()), and there's nothing to do
1996 * for the suspend because it's already suspended, or there's no ZIL.
1998 if (cookiep
== NULL
&& !zilog
->zl_suspending
&&
1999 (zilog
->zl_suspend
> 0 || BP_IS_HOLE(&zh
->zh_log
))) {
2000 mutex_exit(&zilog
->zl_lock
);
2001 dmu_objset_rele(os
, suspend_tag
);
2005 dsl_dataset_long_hold(dmu_objset_ds(os
), suspend_tag
);
2006 dsl_pool_rele(dmu_objset_pool(os
), suspend_tag
);
2008 zilog
->zl_suspend
++;
2010 if (zilog
->zl_suspend
> 1) {
2012 * Someone else is already suspending it.
2013 * Just wait for them to finish.
2016 while (zilog
->zl_suspending
)
2017 cv_wait(&zilog
->zl_cv_suspend
, &zilog
->zl_lock
);
2018 mutex_exit(&zilog
->zl_lock
);
2020 if (cookiep
== NULL
)
2028 * If there is no pointer to an on-disk block, this ZIL must not
2029 * be active (e.g. filesystem not mounted), so there's nothing
2032 if (BP_IS_HOLE(&zh
->zh_log
)) {
2033 ASSERT(cookiep
!= NULL
); /* fast path already handled */
2036 mutex_exit(&zilog
->zl_lock
);
2040 zilog
->zl_suspending
= B_TRUE
;
2041 mutex_exit(&zilog
->zl_lock
);
2043 zil_commit(zilog
, 0);
2045 zil_destroy(zilog
, B_FALSE
);
2047 mutex_enter(&zilog
->zl_lock
);
2048 zilog
->zl_suspending
= B_FALSE
;
2049 cv_broadcast(&zilog
->zl_cv_suspend
);
2050 mutex_exit(&zilog
->zl_lock
);
2052 if (cookiep
== NULL
)
2060 zil_resume(void *cookie
)
2062 objset_t
*os
= cookie
;
2063 zilog_t
*zilog
= dmu_objset_zil(os
);
2065 mutex_enter(&zilog
->zl_lock
);
2066 ASSERT(zilog
->zl_suspend
!= 0);
2067 zilog
->zl_suspend
--;
2068 mutex_exit(&zilog
->zl_lock
);
2069 dsl_dataset_long_rele(dmu_objset_ds(os
), suspend_tag
);
2070 dsl_dataset_rele(dmu_objset_ds(os
), suspend_tag
);
2073 typedef struct zil_replay_arg
{
2074 zil_replay_func_t
*zr_replay
;
2076 boolean_t zr_byteswap
;
2081 zil_replay_error(zilog_t
*zilog
, lr_t
*lr
, int error
)
2083 char name
[MAXNAMELEN
];
2085 zilog
->zl_replaying_seq
--; /* didn't actually replay this one */
2087 dmu_objset_name(zilog
->zl_os
, name
);
2089 cmn_err(CE_WARN
, "ZFS replay transaction error %d, "
2090 "dataset %s, seq 0x%llx, txtype %llu %s\n", error
, name
,
2091 (u_longlong_t
)lr
->lrc_seq
,
2092 (u_longlong_t
)(lr
->lrc_txtype
& ~TX_CI
),
2093 (lr
->lrc_txtype
& TX_CI
) ? "CI" : "");
2099 zil_replay_log_record(zilog_t
*zilog
, lr_t
*lr
, void *zra
, uint64_t claim_txg
)
2101 zil_replay_arg_t
*zr
= zra
;
2102 const zil_header_t
*zh
= zilog
->zl_header
;
2103 uint64_t reclen
= lr
->lrc_reclen
;
2104 uint64_t txtype
= lr
->lrc_txtype
;
2107 zilog
->zl_replaying_seq
= lr
->lrc_seq
;
2109 if (lr
->lrc_seq
<= zh
->zh_replay_seq
) /* already replayed */
2112 if (lr
->lrc_txg
< claim_txg
) /* already committed */
2115 /* Strip case-insensitive bit, still present in log record */
2118 if (txtype
== 0 || txtype
>= TX_MAX_TYPE
)
2119 return (zil_replay_error(zilog
, lr
, EINVAL
));
2122 * If this record type can be logged out of order, the object
2123 * (lr_foid) may no longer exist. That's legitimate, not an error.
2125 if (TX_OOO(txtype
)) {
2126 error
= dmu_object_info(zilog
->zl_os
,
2127 LR_FOID_GET_OBJ(((lr_ooo_t
*)lr
)->lr_foid
), NULL
);
2128 if (error
== ENOENT
|| error
== EEXIST
)
2133 * Make a copy of the data so we can revise and extend it.
2135 bcopy(lr
, zr
->zr_lr
, reclen
);
2138 * If this is a TX_WRITE with a blkptr, suck in the data.
2140 if (txtype
== TX_WRITE
&& reclen
== sizeof (lr_write_t
)) {
2141 error
= zil_read_log_data(zilog
, (lr_write_t
*)lr
,
2142 zr
->zr_lr
+ reclen
);
2144 return (zil_replay_error(zilog
, lr
, error
));
2148 * The log block containing this lr may have been byteswapped
2149 * so that we can easily examine common fields like lrc_txtype.
2150 * However, the log is a mix of different record types, and only the
2151 * replay vectors know how to byteswap their records. Therefore, if
2152 * the lr was byteswapped, undo it before invoking the replay vector.
2154 if (zr
->zr_byteswap
)
2155 byteswap_uint64_array(zr
->zr_lr
, reclen
);
2158 * We must now do two things atomically: replay this log record,
2159 * and update the log header sequence number to reflect the fact that
2160 * we did so. At the end of each replay function the sequence number
2161 * is updated if we are in replay mode.
2163 error
= zr
->zr_replay
[txtype
](zr
->zr_arg
, zr
->zr_lr
, zr
->zr_byteswap
);
2166 * The DMU's dnode layer doesn't see removes until the txg
2167 * commits, so a subsequent claim can spuriously fail with
2168 * EEXIST. So if we receive any error we try syncing out
2169 * any removes then retry the transaction. Note that we
2170 * specify B_FALSE for byteswap now, so we don't do it twice.
2172 txg_wait_synced(spa_get_dsl(zilog
->zl_spa
), 0);
2173 error
= zr
->zr_replay
[txtype
](zr
->zr_arg
, zr
->zr_lr
, B_FALSE
);
2175 return (zil_replay_error(zilog
, lr
, error
));
2182 zil_incr_blks(zilog_t
*zilog
, blkptr_t
*bp
, void *arg
, uint64_t claim_txg
)
2184 zilog
->zl_replay_blks
++;
2190 * If this dataset has a non-empty intent log, replay it and destroy it.
2193 zil_replay(objset_t
*os
, void *arg
, zil_replay_func_t replay_func
[TX_MAX_TYPE
])
2195 zilog_t
*zilog
= dmu_objset_zil(os
);
2196 const zil_header_t
*zh
= zilog
->zl_header
;
2197 zil_replay_arg_t zr
;
2199 if ((zh
->zh_flags
& ZIL_REPLAY_NEEDED
) == 0) {
2200 zil_destroy(zilog
, B_TRUE
);
2204 zr
.zr_replay
= replay_func
;
2206 zr
.zr_byteswap
= BP_SHOULD_BYTESWAP(&zh
->zh_log
);
2207 zr
.zr_lr
= vmem_alloc(2 * SPA_MAXBLOCKSIZE
, KM_SLEEP
);
2210 * Wait for in-progress removes to sync before starting replay.
2212 txg_wait_synced(zilog
->zl_dmu_pool
, 0);
2214 zilog
->zl_replay
= B_TRUE
;
2215 zilog
->zl_replay_time
= ddi_get_lbolt();
2216 ASSERT(zilog
->zl_replay_blks
== 0);
2217 (void) zil_parse(zilog
, zil_incr_blks
, zil_replay_log_record
, &zr
,
2219 vmem_free(zr
.zr_lr
, 2 * SPA_MAXBLOCKSIZE
);
2221 zil_destroy(zilog
, B_FALSE
);
2222 txg_wait_synced(zilog
->zl_dmu_pool
, zilog
->zl_destroy_txg
);
2223 zilog
->zl_replay
= B_FALSE
;
2227 zil_replaying(zilog_t
*zilog
, dmu_tx_t
*tx
)
2229 if (zilog
->zl_sync
== ZFS_SYNC_DISABLED
)
2232 if (zilog
->zl_replay
) {
2233 dsl_dataset_dirty(dmu_objset_ds(zilog
->zl_os
), tx
);
2234 zilog
->zl_replayed_seq
[dmu_tx_get_txg(tx
) & TXG_MASK
] =
2235 zilog
->zl_replaying_seq
;
2244 zil_vdev_offline(const char *osname
, void *arg
)
2248 error
= zil_suspend(osname
, NULL
);
2250 return (SET_ERROR(EEXIST
));
2254 #if defined(_KERNEL) && defined(HAVE_SPL)
2255 EXPORT_SYMBOL(zil_alloc
);
2256 EXPORT_SYMBOL(zil_free
);
2257 EXPORT_SYMBOL(zil_open
);
2258 EXPORT_SYMBOL(zil_close
);
2259 EXPORT_SYMBOL(zil_replay
);
2260 EXPORT_SYMBOL(zil_replaying
);
2261 EXPORT_SYMBOL(zil_destroy
);
2262 EXPORT_SYMBOL(zil_destroy_sync
);
2263 EXPORT_SYMBOL(zil_itx_create
);
2264 EXPORT_SYMBOL(zil_itx_destroy
);
2265 EXPORT_SYMBOL(zil_itx_assign
);
2266 EXPORT_SYMBOL(zil_commit
);
2267 EXPORT_SYMBOL(zil_vdev_offline
);
2268 EXPORT_SYMBOL(zil_claim
);
2269 EXPORT_SYMBOL(zil_check_log_chain
);
2270 EXPORT_SYMBOL(zil_sync
);
2271 EXPORT_SYMBOL(zil_clean
);
2272 EXPORT_SYMBOL(zil_suspend
);
2273 EXPORT_SYMBOL(zil_resume
);
2274 EXPORT_SYMBOL(zil_add_block
);
2275 EXPORT_SYMBOL(zil_bp_tree_add
);
2276 EXPORT_SYMBOL(zil_set_sync
);
2277 EXPORT_SYMBOL(zil_set_logbias
);
2279 module_param(zil_replay_disable
, int, 0644);
2280 MODULE_PARM_DESC(zil_replay_disable
, "Disable intent logging replay");
2282 module_param(zfs_nocacheflush
, int, 0644);
2283 MODULE_PARM_DESC(zfs_nocacheflush
, "Disable cache flushes");
2285 module_param(zil_slog_limit
, ulong
, 0644);
2286 MODULE_PARM_DESC(zil_slog_limit
, "Max commit bytes to separate log device");