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, 2020 by Delphix. All rights reserved.
24 * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2017, Intel Corporation.
26 * Copyright (c) 2019, Klara Inc.
27 * Copyright (c) 2019, Allan Jude
28 * Copyright (c) 2021, Datto, Inc.
31 #include <sys/sysmacros.h>
32 #include <sys/zfs_context.h>
33 #include <sys/fm/fs/zfs.h>
36 #include <sys/spa_impl.h>
37 #include <sys/vdev_impl.h>
38 #include <sys/vdev_trim.h>
39 #include <sys/zio_impl.h>
40 #include <sys/zio_compress.h>
41 #include <sys/zio_checksum.h>
42 #include <sys/dmu_objset.h>
45 #include <sys/blkptr.h>
46 #include <sys/zfeature.h>
47 #include <sys/dsl_scan.h>
48 #include <sys/metaslab_impl.h>
50 #include <sys/trace_zfs.h>
52 #include <sys/dsl_crypt.h>
56 * ==========================================================================
57 * I/O type descriptions
58 * ==========================================================================
60 const char *const zio_type_name
[ZIO_TYPES
] = {
62 * Note: Linux kernel thread name length is limited
63 * so these names will differ from upstream open zfs.
65 "z_null", "z_rd", "z_wr", "z_fr", "z_cl", "z_ioctl", "z_trim"
68 int zio_dva_throttle_enabled
= B_TRUE
;
69 static int zio_deadman_log_all
= B_FALSE
;
72 * ==========================================================================
74 * ==========================================================================
76 static kmem_cache_t
*zio_cache
;
77 static kmem_cache_t
*zio_link_cache
;
78 kmem_cache_t
*zio_buf_cache
[SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
];
79 kmem_cache_t
*zio_data_buf_cache
[SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
];
80 #if defined(ZFS_DEBUG) && !defined(_KERNEL)
81 static uint64_t zio_buf_cache_allocs
[SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
];
82 static uint64_t zio_buf_cache_frees
[SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
];
85 /* Mark IOs as "slow" if they take longer than 30 seconds */
86 static int zio_slow_io_ms
= (30 * MILLISEC
);
88 #define BP_SPANB(indblkshift, level) \
89 (((uint64_t)1) << ((level) * ((indblkshift) - SPA_BLKPTRSHIFT)))
90 #define COMPARE_META_LEVEL 0x80000000ul
92 * The following actions directly effect the spa's sync-to-convergence logic.
93 * The values below define the sync pass when we start performing the action.
94 * Care should be taken when changing these values as they directly impact
95 * spa_sync() performance. Tuning these values may introduce subtle performance
96 * pathologies and should only be done in the context of performance analysis.
97 * These tunables will eventually be removed and replaced with #defines once
98 * enough analysis has been done to determine optimal values.
100 * The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that
101 * regular blocks are not deferred.
103 * Starting in sync pass 8 (zfs_sync_pass_dont_compress), we disable
104 * compression (including of metadata). In practice, we don't have this
105 * many sync passes, so this has no effect.
107 * The original intent was that disabling compression would help the sync
108 * passes to converge. However, in practice disabling compression increases
109 * the average number of sync passes, because when we turn compression off, a
110 * lot of block's size will change and thus we have to re-allocate (not
111 * overwrite) them. It also increases the number of 128KB allocations (e.g.
112 * for indirect blocks and spacemaps) because these will not be compressed.
113 * The 128K allocations are especially detrimental to performance on highly
114 * fragmented systems, which may have very few free segments of this size,
115 * and may need to load new metaslabs to satisfy 128K allocations.
117 int zfs_sync_pass_deferred_free
= 2; /* defer frees starting in this pass */
118 static int zfs_sync_pass_dont_compress
= 8; /* don't compress s. i. t. p. */
119 static int zfs_sync_pass_rewrite
= 2; /* rewrite new bps s. i. t. p. */
122 * An allocating zio is one that either currently has the DVA allocate
123 * stage set or will have it later in its lifetime.
125 #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE)
128 * Enable smaller cores by excluding metadata
129 * allocations as well.
131 int zio_exclude_metadata
= 0;
132 static int zio_requeue_io_start_cut_in_line
= 1;
135 static const int zio_buf_debug_limit
= 16384;
137 static const int zio_buf_debug_limit
= 0;
140 static inline void __zio_execute(zio_t
*zio
);
142 static void zio_taskq_dispatch(zio_t
*, zio_taskq_type_t
, boolean_t
);
149 zio_cache
= kmem_cache_create("zio_cache",
150 sizeof (zio_t
), 0, NULL
, NULL
, NULL
, NULL
, NULL
, 0);
151 zio_link_cache
= kmem_cache_create("zio_link_cache",
152 sizeof (zio_link_t
), 0, NULL
, NULL
, NULL
, NULL
, NULL
, 0);
155 * For small buffers, we want a cache for each multiple of
156 * SPA_MINBLOCKSIZE. For larger buffers, we want a cache
157 * for each quarter-power of 2.
159 for (c
= 0; c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
; c
++) {
160 size_t size
= (c
+ 1) << SPA_MINBLOCKSHIFT
;
163 size_t data_cflags
, cflags
;
165 data_cflags
= KMC_NODEBUG
;
166 cflags
= (zio_exclude_metadata
|| size
> zio_buf_debug_limit
) ?
169 #if defined(_ILP32) && defined(_KERNEL)
171 * Cache size limited to 1M on 32-bit platforms until ARC
172 * buffers no longer require virtual address space.
174 if (size
> zfs_max_recordsize
)
183 * If we are using watchpoints, put each buffer on its own page,
184 * to eliminate the performance overhead of trapping to the
185 * kernel when modifying a non-watched buffer that shares the
186 * page with a watched buffer.
188 if (arc_watch
&& !IS_P2ALIGNED(size
, PAGESIZE
))
191 * Here's the problem - on 4K native devices in userland on
192 * Linux using O_DIRECT, buffers must be 4K aligned or I/O
193 * will fail with EINVAL, causing zdb (and others) to coredump.
194 * Since userland probably doesn't need optimized buffer caches,
195 * we just force 4K alignment on everything.
197 align
= 8 * SPA_MINBLOCKSIZE
;
199 if (size
< PAGESIZE
) {
200 align
= SPA_MINBLOCKSIZE
;
201 } else if (IS_P2ALIGNED(size
, p2
>> 2)) {
208 if (cflags
== data_cflags
) {
210 * Resulting kmem caches would be identical.
211 * Save memory by creating only one.
213 (void) snprintf(name
, sizeof (name
),
214 "zio_buf_comb_%lu", (ulong_t
)size
);
215 zio_buf_cache
[c
] = kmem_cache_create(name
,
216 size
, align
, NULL
, NULL
, NULL
, NULL
, NULL
,
218 zio_data_buf_cache
[c
] = zio_buf_cache
[c
];
221 (void) snprintf(name
, sizeof (name
), "zio_buf_%lu",
223 zio_buf_cache
[c
] = kmem_cache_create(name
, size
,
224 align
, NULL
, NULL
, NULL
, NULL
, NULL
, cflags
);
226 (void) snprintf(name
, sizeof (name
), "zio_data_buf_%lu",
228 zio_data_buf_cache
[c
] = kmem_cache_create(name
, size
,
229 align
, NULL
, NULL
, NULL
, NULL
, NULL
, data_cflags
);
234 ASSERT(zio_buf_cache
[c
] != NULL
);
235 if (zio_buf_cache
[c
- 1] == NULL
)
236 zio_buf_cache
[c
- 1] = zio_buf_cache
[c
];
238 ASSERT(zio_data_buf_cache
[c
] != NULL
);
239 if (zio_data_buf_cache
[c
- 1] == NULL
)
240 zio_data_buf_cache
[c
- 1] = zio_data_buf_cache
[c
];
251 size_t n
= SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
;
253 #if defined(ZFS_DEBUG) && !defined(_KERNEL)
254 for (size_t i
= 0; i
< n
; i
++) {
255 if (zio_buf_cache_allocs
[i
] != zio_buf_cache_frees
[i
])
256 (void) printf("zio_fini: [%d] %llu != %llu\n",
257 (int)((i
+ 1) << SPA_MINBLOCKSHIFT
),
258 (long long unsigned)zio_buf_cache_allocs
[i
],
259 (long long unsigned)zio_buf_cache_frees
[i
]);
264 * The same kmem cache can show up multiple times in both zio_buf_cache
265 * and zio_data_buf_cache. Do a wasteful but trivially correct scan to
268 for (size_t i
= 0; i
< n
; i
++) {
269 kmem_cache_t
*cache
= zio_buf_cache
[i
];
272 for (size_t j
= i
; j
< n
; j
++) {
273 if (cache
== zio_buf_cache
[j
])
274 zio_buf_cache
[j
] = NULL
;
275 if (cache
== zio_data_buf_cache
[j
])
276 zio_data_buf_cache
[j
] = NULL
;
278 kmem_cache_destroy(cache
);
281 for (size_t i
= 0; i
< n
; i
++) {
282 kmem_cache_t
*cache
= zio_data_buf_cache
[i
];
285 for (size_t j
= i
; j
< n
; j
++) {
286 if (cache
== zio_data_buf_cache
[j
])
287 zio_data_buf_cache
[j
] = NULL
;
289 kmem_cache_destroy(cache
);
292 for (size_t i
= 0; i
< n
; i
++) {
293 VERIFY3P(zio_buf_cache
[i
], ==, NULL
);
294 VERIFY3P(zio_data_buf_cache
[i
], ==, NULL
);
297 kmem_cache_destroy(zio_link_cache
);
298 kmem_cache_destroy(zio_cache
);
306 * ==========================================================================
307 * Allocate and free I/O buffers
308 * ==========================================================================
312 * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a
313 * crashdump if the kernel panics, so use it judiciously. Obviously, it's
314 * useful to inspect ZFS metadata, but if possible, we should avoid keeping
315 * excess / transient data in-core during a crashdump.
318 zio_buf_alloc(size_t size
)
320 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
322 VERIFY3U(c
, <, SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
323 #if defined(ZFS_DEBUG) && !defined(_KERNEL)
324 atomic_add_64(&zio_buf_cache_allocs
[c
], 1);
327 return (kmem_cache_alloc(zio_buf_cache
[c
], KM_PUSHPAGE
));
331 * Use zio_data_buf_alloc to allocate data. The data will not appear in a
332 * crashdump if the kernel panics. This exists so that we will limit the amount
333 * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount
334 * of kernel heap dumped to disk when the kernel panics)
337 zio_data_buf_alloc(size_t size
)
339 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
341 VERIFY3U(c
, <, SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
343 return (kmem_cache_alloc(zio_data_buf_cache
[c
], KM_PUSHPAGE
));
347 zio_buf_free(void *buf
, size_t size
)
349 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
351 VERIFY3U(c
, <, SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
352 #if defined(ZFS_DEBUG) && !defined(_KERNEL)
353 atomic_add_64(&zio_buf_cache_frees
[c
], 1);
356 kmem_cache_free(zio_buf_cache
[c
], buf
);
360 zio_data_buf_free(void *buf
, size_t size
)
362 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
364 VERIFY3U(c
, <, SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
366 kmem_cache_free(zio_data_buf_cache
[c
], buf
);
370 zio_abd_free(void *abd
, size_t size
)
373 abd_free((abd_t
*)abd
);
377 * ==========================================================================
378 * Push and pop I/O transform buffers
379 * ==========================================================================
382 zio_push_transform(zio_t
*zio
, abd_t
*data
, uint64_t size
, uint64_t bufsize
,
383 zio_transform_func_t
*transform
)
385 zio_transform_t
*zt
= kmem_alloc(sizeof (zio_transform_t
), KM_SLEEP
);
387 zt
->zt_orig_abd
= zio
->io_abd
;
388 zt
->zt_orig_size
= zio
->io_size
;
389 zt
->zt_bufsize
= bufsize
;
390 zt
->zt_transform
= transform
;
392 zt
->zt_next
= zio
->io_transform_stack
;
393 zio
->io_transform_stack
= zt
;
400 zio_pop_transforms(zio_t
*zio
)
404 while ((zt
= zio
->io_transform_stack
) != NULL
) {
405 if (zt
->zt_transform
!= NULL
)
406 zt
->zt_transform(zio
,
407 zt
->zt_orig_abd
, zt
->zt_orig_size
);
409 if (zt
->zt_bufsize
!= 0)
410 abd_free(zio
->io_abd
);
412 zio
->io_abd
= zt
->zt_orig_abd
;
413 zio
->io_size
= zt
->zt_orig_size
;
414 zio
->io_transform_stack
= zt
->zt_next
;
416 kmem_free(zt
, sizeof (zio_transform_t
));
421 * ==========================================================================
422 * I/O transform callbacks for subblocks, decompression, and decryption
423 * ==========================================================================
426 zio_subblock(zio_t
*zio
, abd_t
*data
, uint64_t size
)
428 ASSERT(zio
->io_size
> size
);
430 if (zio
->io_type
== ZIO_TYPE_READ
)
431 abd_copy(data
, zio
->io_abd
, size
);
435 zio_decompress(zio_t
*zio
, abd_t
*data
, uint64_t size
)
437 if (zio
->io_error
== 0) {
438 void *tmp
= abd_borrow_buf(data
, size
);
439 int ret
= zio_decompress_data(BP_GET_COMPRESS(zio
->io_bp
),
440 zio
->io_abd
, tmp
, zio
->io_size
, size
,
441 &zio
->io_prop
.zp_complevel
);
442 abd_return_buf_copy(data
, tmp
, size
);
444 if (zio_injection_enabled
&& ret
== 0)
445 ret
= zio_handle_fault_injection(zio
, EINVAL
);
448 zio
->io_error
= SET_ERROR(EIO
);
453 zio_decrypt(zio_t
*zio
, abd_t
*data
, uint64_t size
)
457 blkptr_t
*bp
= zio
->io_bp
;
458 spa_t
*spa
= zio
->io_spa
;
459 uint64_t dsobj
= zio
->io_bookmark
.zb_objset
;
460 uint64_t lsize
= BP_GET_LSIZE(bp
);
461 dmu_object_type_t ot
= BP_GET_TYPE(bp
);
462 uint8_t salt
[ZIO_DATA_SALT_LEN
];
463 uint8_t iv
[ZIO_DATA_IV_LEN
];
464 uint8_t mac
[ZIO_DATA_MAC_LEN
];
465 boolean_t no_crypt
= B_FALSE
;
467 ASSERT(BP_USES_CRYPT(bp
));
468 ASSERT3U(size
, !=, 0);
470 if (zio
->io_error
!= 0)
474 * Verify the cksum of MACs stored in an indirect bp. It will always
475 * be possible to verify this since it does not require an encryption
478 if (BP_HAS_INDIRECT_MAC_CKSUM(bp
)) {
479 zio_crypt_decode_mac_bp(bp
, mac
);
481 if (BP_GET_COMPRESS(bp
) != ZIO_COMPRESS_OFF
) {
483 * We haven't decompressed the data yet, but
484 * zio_crypt_do_indirect_mac_checksum() requires
485 * decompressed data to be able to parse out the MACs
486 * from the indirect block. We decompress it now and
487 * throw away the result after we are finished.
489 tmp
= zio_buf_alloc(lsize
);
490 ret
= zio_decompress_data(BP_GET_COMPRESS(bp
),
491 zio
->io_abd
, tmp
, zio
->io_size
, lsize
,
492 &zio
->io_prop
.zp_complevel
);
494 ret
= SET_ERROR(EIO
);
497 ret
= zio_crypt_do_indirect_mac_checksum(B_FALSE
,
498 tmp
, lsize
, BP_SHOULD_BYTESWAP(bp
), mac
);
499 zio_buf_free(tmp
, lsize
);
501 ret
= zio_crypt_do_indirect_mac_checksum_abd(B_FALSE
,
502 zio
->io_abd
, size
, BP_SHOULD_BYTESWAP(bp
), mac
);
504 abd_copy(data
, zio
->io_abd
, size
);
506 if (zio_injection_enabled
&& ot
!= DMU_OT_DNODE
&& ret
== 0) {
507 ret
= zio_handle_decrypt_injection(spa
,
508 &zio
->io_bookmark
, ot
, ECKSUM
);
517 * If this is an authenticated block, just check the MAC. It would be
518 * nice to separate this out into its own flag, but for the moment
519 * enum zio_flag is out of bits.
521 if (BP_IS_AUTHENTICATED(bp
)) {
522 if (ot
== DMU_OT_OBJSET
) {
523 ret
= spa_do_crypt_objset_mac_abd(B_FALSE
, spa
,
524 dsobj
, zio
->io_abd
, size
, BP_SHOULD_BYTESWAP(bp
));
526 zio_crypt_decode_mac_bp(bp
, mac
);
527 ret
= spa_do_crypt_mac_abd(B_FALSE
, spa
, dsobj
,
528 zio
->io_abd
, size
, mac
);
529 if (zio_injection_enabled
&& ret
== 0) {
530 ret
= zio_handle_decrypt_injection(spa
,
531 &zio
->io_bookmark
, ot
, ECKSUM
);
534 abd_copy(data
, zio
->io_abd
, size
);
542 zio_crypt_decode_params_bp(bp
, salt
, iv
);
544 if (ot
== DMU_OT_INTENT_LOG
) {
545 tmp
= abd_borrow_buf_copy(zio
->io_abd
, sizeof (zil_chain_t
));
546 zio_crypt_decode_mac_zil(tmp
, mac
);
547 abd_return_buf(zio
->io_abd
, tmp
, sizeof (zil_chain_t
));
549 zio_crypt_decode_mac_bp(bp
, mac
);
552 ret
= spa_do_crypt_abd(B_FALSE
, spa
, &zio
->io_bookmark
, BP_GET_TYPE(bp
),
553 BP_GET_DEDUP(bp
), BP_SHOULD_BYTESWAP(bp
), salt
, iv
, mac
, size
, data
,
554 zio
->io_abd
, &no_crypt
);
556 abd_copy(data
, zio
->io_abd
, size
);
564 /* assert that the key was found unless this was speculative */
565 ASSERT(ret
!= EACCES
|| (zio
->io_flags
& ZIO_FLAG_SPECULATIVE
));
568 * If there was a decryption / authentication error return EIO as
569 * the io_error. If this was not a speculative zio, create an ereport.
572 zio
->io_error
= SET_ERROR(EIO
);
573 if ((zio
->io_flags
& ZIO_FLAG_SPECULATIVE
) == 0) {
574 spa_log_error(spa
, &zio
->io_bookmark
);
575 (void) zfs_ereport_post(FM_EREPORT_ZFS_AUTHENTICATION
,
576 spa
, NULL
, &zio
->io_bookmark
, zio
, 0);
584 * ==========================================================================
585 * I/O parent/child relationships and pipeline interlocks
586 * ==========================================================================
589 zio_walk_parents(zio_t
*cio
, zio_link_t
**zl
)
591 list_t
*pl
= &cio
->io_parent_list
;
593 *zl
= (*zl
== NULL
) ? list_head(pl
) : list_next(pl
, *zl
);
597 ASSERT((*zl
)->zl_child
== cio
);
598 return ((*zl
)->zl_parent
);
602 zio_walk_children(zio_t
*pio
, zio_link_t
**zl
)
604 list_t
*cl
= &pio
->io_child_list
;
606 ASSERT(MUTEX_HELD(&pio
->io_lock
));
608 *zl
= (*zl
== NULL
) ? list_head(cl
) : list_next(cl
, *zl
);
612 ASSERT((*zl
)->zl_parent
== pio
);
613 return ((*zl
)->zl_child
);
617 zio_unique_parent(zio_t
*cio
)
619 zio_link_t
*zl
= NULL
;
620 zio_t
*pio
= zio_walk_parents(cio
, &zl
);
622 VERIFY3P(zio_walk_parents(cio
, &zl
), ==, NULL
);
627 zio_add_child(zio_t
*pio
, zio_t
*cio
)
629 zio_link_t
*zl
= kmem_cache_alloc(zio_link_cache
, KM_SLEEP
);
632 * Logical I/Os can have logical, gang, or vdev children.
633 * Gang I/Os can have gang or vdev children.
634 * Vdev I/Os can only have vdev children.
635 * The following ASSERT captures all of these constraints.
637 ASSERT3S(cio
->io_child_type
, <=, pio
->io_child_type
);
642 mutex_enter(&pio
->io_lock
);
643 mutex_enter(&cio
->io_lock
);
645 ASSERT(pio
->io_state
[ZIO_WAIT_DONE
] == 0);
647 for (int w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
648 pio
->io_children
[cio
->io_child_type
][w
] += !cio
->io_state
[w
];
650 list_insert_head(&pio
->io_child_list
, zl
);
651 list_insert_head(&cio
->io_parent_list
, zl
);
653 pio
->io_child_count
++;
654 cio
->io_parent_count
++;
656 mutex_exit(&cio
->io_lock
);
657 mutex_exit(&pio
->io_lock
);
661 zio_remove_child(zio_t
*pio
, zio_t
*cio
, zio_link_t
*zl
)
663 ASSERT(zl
->zl_parent
== pio
);
664 ASSERT(zl
->zl_child
== cio
);
666 mutex_enter(&pio
->io_lock
);
667 mutex_enter(&cio
->io_lock
);
669 list_remove(&pio
->io_child_list
, zl
);
670 list_remove(&cio
->io_parent_list
, zl
);
672 pio
->io_child_count
--;
673 cio
->io_parent_count
--;
675 mutex_exit(&cio
->io_lock
);
676 mutex_exit(&pio
->io_lock
);
677 kmem_cache_free(zio_link_cache
, zl
);
681 zio_wait_for_children(zio_t
*zio
, uint8_t childbits
, enum zio_wait_type wait
)
683 boolean_t waiting
= B_FALSE
;
685 mutex_enter(&zio
->io_lock
);
686 ASSERT(zio
->io_stall
== NULL
);
687 for (int c
= 0; c
< ZIO_CHILD_TYPES
; c
++) {
688 if (!(ZIO_CHILD_BIT_IS_SET(childbits
, c
)))
691 uint64_t *countp
= &zio
->io_children
[c
][wait
];
694 ASSERT3U(zio
->io_stage
, !=, ZIO_STAGE_OPEN
);
695 zio
->io_stall
= countp
;
700 mutex_exit(&zio
->io_lock
);
704 __attribute__((always_inline
))
706 zio_notify_parent(zio_t
*pio
, zio_t
*zio
, enum zio_wait_type wait
,
707 zio_t
**next_to_executep
)
709 uint64_t *countp
= &pio
->io_children
[zio
->io_child_type
][wait
];
710 int *errorp
= &pio
->io_child_error
[zio
->io_child_type
];
712 mutex_enter(&pio
->io_lock
);
713 if (zio
->io_error
&& !(zio
->io_flags
& ZIO_FLAG_DONT_PROPAGATE
))
714 *errorp
= zio_worst_error(*errorp
, zio
->io_error
);
715 pio
->io_reexecute
|= zio
->io_reexecute
;
716 ASSERT3U(*countp
, >, 0);
720 if (*countp
== 0 && pio
->io_stall
== countp
) {
721 zio_taskq_type_t type
=
722 pio
->io_stage
< ZIO_STAGE_VDEV_IO_START
? ZIO_TASKQ_ISSUE
:
724 pio
->io_stall
= NULL
;
725 mutex_exit(&pio
->io_lock
);
728 * If we can tell the caller to execute this parent next, do
729 * so. Otherwise dispatch the parent zio as its own task.
731 * Having the caller execute the parent when possible reduces
732 * locking on the zio taskq's, reduces context switch
733 * overhead, and has no recursion penalty. Note that one
734 * read from disk typically causes at least 3 zio's: a
735 * zio_null(), the logical zio_read(), and then a physical
736 * zio. When the physical ZIO completes, we are able to call
737 * zio_done() on all 3 of these zio's from one invocation of
738 * zio_execute() by returning the parent back to
739 * zio_execute(). Since the parent isn't executed until this
740 * thread returns back to zio_execute(), the caller should do
743 * In other cases, dispatching the parent prevents
744 * overflowing the stack when we have deeply nested
745 * parent-child relationships, as we do with the "mega zio"
746 * of writes for spa_sync(), and the chain of ZIL blocks.
748 if (next_to_executep
!= NULL
&& *next_to_executep
== NULL
) {
749 *next_to_executep
= pio
;
751 zio_taskq_dispatch(pio
, type
, B_FALSE
);
754 mutex_exit(&pio
->io_lock
);
759 zio_inherit_child_errors(zio_t
*zio
, enum zio_child c
)
761 if (zio
->io_child_error
[c
] != 0 && zio
->io_error
== 0)
762 zio
->io_error
= zio
->io_child_error
[c
];
766 zio_bookmark_compare(const void *x1
, const void *x2
)
768 const zio_t
*z1
= x1
;
769 const zio_t
*z2
= x2
;
771 if (z1
->io_bookmark
.zb_objset
< z2
->io_bookmark
.zb_objset
)
773 if (z1
->io_bookmark
.zb_objset
> z2
->io_bookmark
.zb_objset
)
776 if (z1
->io_bookmark
.zb_object
< z2
->io_bookmark
.zb_object
)
778 if (z1
->io_bookmark
.zb_object
> z2
->io_bookmark
.zb_object
)
781 if (z1
->io_bookmark
.zb_level
< z2
->io_bookmark
.zb_level
)
783 if (z1
->io_bookmark
.zb_level
> z2
->io_bookmark
.zb_level
)
786 if (z1
->io_bookmark
.zb_blkid
< z2
->io_bookmark
.zb_blkid
)
788 if (z1
->io_bookmark
.zb_blkid
> z2
->io_bookmark
.zb_blkid
)
800 * ==========================================================================
801 * Create the various types of I/O (read, write, free, etc)
802 * ==========================================================================
805 zio_create(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
,
806 abd_t
*data
, uint64_t lsize
, uint64_t psize
, zio_done_func_t
*done
,
807 void *private, zio_type_t type
, zio_priority_t priority
,
808 enum zio_flag flags
, vdev_t
*vd
, uint64_t offset
,
809 const zbookmark_phys_t
*zb
, enum zio_stage stage
,
810 enum zio_stage pipeline
)
814 IMPLY(type
!= ZIO_TYPE_TRIM
, psize
<= SPA_MAXBLOCKSIZE
);
815 ASSERT(P2PHASE(psize
, SPA_MINBLOCKSIZE
) == 0);
816 ASSERT(P2PHASE(offset
, SPA_MINBLOCKSIZE
) == 0);
818 ASSERT(!vd
|| spa_config_held(spa
, SCL_STATE_ALL
, RW_READER
));
819 ASSERT(!bp
|| !(flags
& ZIO_FLAG_CONFIG_WRITER
));
820 ASSERT(vd
|| stage
== ZIO_STAGE_OPEN
);
822 IMPLY(lsize
!= psize
, (flags
& ZIO_FLAG_RAW_COMPRESS
) != 0);
824 zio
= kmem_cache_alloc(zio_cache
, KM_SLEEP
);
825 bzero(zio
, sizeof (zio_t
));
827 mutex_init(&zio
->io_lock
, NULL
, MUTEX_NOLOCKDEP
, NULL
);
828 cv_init(&zio
->io_cv
, NULL
, CV_DEFAULT
, NULL
);
830 list_create(&zio
->io_parent_list
, sizeof (zio_link_t
),
831 offsetof(zio_link_t
, zl_parent_node
));
832 list_create(&zio
->io_child_list
, sizeof (zio_link_t
),
833 offsetof(zio_link_t
, zl_child_node
));
834 metaslab_trace_init(&zio
->io_alloc_list
);
837 zio
->io_child_type
= ZIO_CHILD_VDEV
;
838 else if (flags
& ZIO_FLAG_GANG_CHILD
)
839 zio
->io_child_type
= ZIO_CHILD_GANG
;
840 else if (flags
& ZIO_FLAG_DDT_CHILD
)
841 zio
->io_child_type
= ZIO_CHILD_DDT
;
843 zio
->io_child_type
= ZIO_CHILD_LOGICAL
;
846 zio
->io_bp
= (blkptr_t
*)bp
;
847 zio
->io_bp_copy
= *bp
;
848 zio
->io_bp_orig
= *bp
;
849 if (type
!= ZIO_TYPE_WRITE
||
850 zio
->io_child_type
== ZIO_CHILD_DDT
)
851 zio
->io_bp
= &zio
->io_bp_copy
; /* so caller can free */
852 if (zio
->io_child_type
== ZIO_CHILD_LOGICAL
)
853 zio
->io_logical
= zio
;
854 if (zio
->io_child_type
> ZIO_CHILD_GANG
&& BP_IS_GANG(bp
))
855 pipeline
|= ZIO_GANG_STAGES
;
861 zio
->io_private
= private;
863 zio
->io_priority
= priority
;
865 zio
->io_offset
= offset
;
866 zio
->io_orig_abd
= zio
->io_abd
= data
;
867 zio
->io_orig_size
= zio
->io_size
= psize
;
868 zio
->io_lsize
= lsize
;
869 zio
->io_orig_flags
= zio
->io_flags
= flags
;
870 zio
->io_orig_stage
= zio
->io_stage
= stage
;
871 zio
->io_orig_pipeline
= zio
->io_pipeline
= pipeline
;
872 zio
->io_pipeline_trace
= ZIO_STAGE_OPEN
;
874 zio
->io_state
[ZIO_WAIT_READY
] = (stage
>= ZIO_STAGE_READY
);
875 zio
->io_state
[ZIO_WAIT_DONE
] = (stage
>= ZIO_STAGE_DONE
);
878 zio
->io_bookmark
= *zb
;
881 zio
->io_metaslab_class
= pio
->io_metaslab_class
;
882 if (zio
->io_logical
== NULL
)
883 zio
->io_logical
= pio
->io_logical
;
884 if (zio
->io_child_type
== ZIO_CHILD_GANG
)
885 zio
->io_gang_leader
= pio
->io_gang_leader
;
886 zio_add_child(pio
, zio
);
889 taskq_init_ent(&zio
->io_tqent
);
895 zio_destroy(zio_t
*zio
)
897 metaslab_trace_fini(&zio
->io_alloc_list
);
898 list_destroy(&zio
->io_parent_list
);
899 list_destroy(&zio
->io_child_list
);
900 mutex_destroy(&zio
->io_lock
);
901 cv_destroy(&zio
->io_cv
);
902 kmem_cache_free(zio_cache
, zio
);
906 zio_null(zio_t
*pio
, spa_t
*spa
, vdev_t
*vd
, zio_done_func_t
*done
,
907 void *private, enum zio_flag flags
)
911 zio
= zio_create(pio
, spa
, 0, NULL
, NULL
, 0, 0, done
, private,
912 ZIO_TYPE_NULL
, ZIO_PRIORITY_NOW
, flags
, vd
, 0, NULL
,
913 ZIO_STAGE_OPEN
, ZIO_INTERLOCK_PIPELINE
);
919 zio_root(spa_t
*spa
, zio_done_func_t
*done
, void *private, enum zio_flag flags
)
921 return (zio_null(NULL
, spa
, NULL
, done
, private, flags
));
925 zfs_blkptr_verify_log(spa_t
*spa
, const blkptr_t
*bp
,
926 enum blk_verify_flag blk_verify
, const char *fmt
, ...)
932 (void) vsnprintf(buf
, sizeof (buf
), fmt
, adx
);
935 switch (blk_verify
) {
936 case BLK_VERIFY_HALT
:
937 dprintf_bp(bp
, "blkptr at %p dprintf_bp():", bp
);
938 zfs_panic_recover("%s: %s", spa_name(spa
), buf
);
941 zfs_dbgmsg("%s: %s", spa_name(spa
), buf
);
943 case BLK_VERIFY_ONLY
:
951 * Verify the block pointer fields contain reasonable values. This means
952 * it only contains known object types, checksum/compression identifiers,
953 * block sizes within the maximum allowed limits, valid DVAs, etc.
955 * If everything checks out B_TRUE is returned. The zfs_blkptr_verify
956 * argument controls the behavior when an invalid field is detected.
958 * Modes for zfs_blkptr_verify:
959 * 1) BLK_VERIFY_ONLY (evaluate the block)
960 * 2) BLK_VERIFY_LOG (evaluate the block and log problems)
961 * 3) BLK_VERIFY_HALT (call zfs_panic_recover on error)
964 zfs_blkptr_verify(spa_t
*spa
, const blkptr_t
*bp
, boolean_t config_held
,
965 enum blk_verify_flag blk_verify
)
969 if (!DMU_OT_IS_VALID(BP_GET_TYPE(bp
))) {
970 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
971 "blkptr at %p has invalid TYPE %llu",
972 bp
, (longlong_t
)BP_GET_TYPE(bp
));
974 if (BP_GET_CHECKSUM(bp
) >= ZIO_CHECKSUM_FUNCTIONS
||
975 BP_GET_CHECKSUM(bp
) <= ZIO_CHECKSUM_ON
) {
976 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
977 "blkptr at %p has invalid CHECKSUM %llu",
978 bp
, (longlong_t
)BP_GET_CHECKSUM(bp
));
980 if (BP_GET_COMPRESS(bp
) >= ZIO_COMPRESS_FUNCTIONS
||
981 BP_GET_COMPRESS(bp
) <= ZIO_COMPRESS_ON
) {
982 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
983 "blkptr at %p has invalid COMPRESS %llu",
984 bp
, (longlong_t
)BP_GET_COMPRESS(bp
));
986 if (BP_GET_LSIZE(bp
) > SPA_MAXBLOCKSIZE
) {
987 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
988 "blkptr at %p has invalid LSIZE %llu",
989 bp
, (longlong_t
)BP_GET_LSIZE(bp
));
991 if (BP_GET_PSIZE(bp
) > SPA_MAXBLOCKSIZE
) {
992 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
993 "blkptr at %p has invalid PSIZE %llu",
994 bp
, (longlong_t
)BP_GET_PSIZE(bp
));
997 if (BP_IS_EMBEDDED(bp
)) {
998 if (BPE_GET_ETYPE(bp
) >= NUM_BP_EMBEDDED_TYPES
) {
999 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
1000 "blkptr at %p has invalid ETYPE %llu",
1001 bp
, (longlong_t
)BPE_GET_ETYPE(bp
));
1006 * Do not verify individual DVAs if the config is not trusted. This
1007 * will be done once the zio is executed in vdev_mirror_map_alloc.
1009 if (!spa
->spa_trust_config
)
1010 return (errors
== 0);
1013 spa_config_enter(spa
, SCL_VDEV
, bp
, RW_READER
);
1015 ASSERT(spa_config_held(spa
, SCL_VDEV
, RW_WRITER
));
1017 * Pool-specific checks.
1019 * Note: it would be nice to verify that the blk_birth and
1020 * BP_PHYSICAL_BIRTH() are not too large. However, spa_freeze()
1021 * allows the birth time of log blocks (and dmu_sync()-ed blocks
1022 * that are in the log) to be arbitrarily large.
1024 for (int i
= 0; i
< BP_GET_NDVAS(bp
); i
++) {
1025 const dva_t
*dva
= &bp
->blk_dva
[i
];
1026 uint64_t vdevid
= DVA_GET_VDEV(dva
);
1028 if (vdevid
>= spa
->spa_root_vdev
->vdev_children
) {
1029 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
1030 "blkptr at %p DVA %u has invalid VDEV %llu",
1031 bp
, i
, (longlong_t
)vdevid
);
1034 vdev_t
*vd
= spa
->spa_root_vdev
->vdev_child
[vdevid
];
1036 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
1037 "blkptr at %p DVA %u has invalid VDEV %llu",
1038 bp
, i
, (longlong_t
)vdevid
);
1041 if (vd
->vdev_ops
== &vdev_hole_ops
) {
1042 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
1043 "blkptr at %p DVA %u has hole VDEV %llu",
1044 bp
, i
, (longlong_t
)vdevid
);
1047 if (vd
->vdev_ops
== &vdev_missing_ops
) {
1049 * "missing" vdevs are valid during import, but we
1050 * don't have their detailed info (e.g. asize), so
1051 * we can't perform any more checks on them.
1055 uint64_t offset
= DVA_GET_OFFSET(dva
);
1056 uint64_t asize
= DVA_GET_ASIZE(dva
);
1057 if (DVA_GET_GANG(dva
))
1058 asize
= vdev_gang_header_asize(vd
);
1059 if (offset
+ asize
> vd
->vdev_asize
) {
1060 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
1061 "blkptr at %p DVA %u has invalid OFFSET %llu",
1062 bp
, i
, (longlong_t
)offset
);
1066 dprintf_bp(bp
, "blkptr at %p dprintf_bp():", bp
);
1068 spa_config_exit(spa
, SCL_VDEV
, bp
);
1070 return (errors
== 0);
1074 zfs_dva_valid(spa_t
*spa
, const dva_t
*dva
, const blkptr_t
*bp
)
1077 uint64_t vdevid
= DVA_GET_VDEV(dva
);
1079 if (vdevid
>= spa
->spa_root_vdev
->vdev_children
)
1082 vdev_t
*vd
= spa
->spa_root_vdev
->vdev_child
[vdevid
];
1086 if (vd
->vdev_ops
== &vdev_hole_ops
)
1089 if (vd
->vdev_ops
== &vdev_missing_ops
) {
1093 uint64_t offset
= DVA_GET_OFFSET(dva
);
1094 uint64_t asize
= DVA_GET_ASIZE(dva
);
1096 if (DVA_GET_GANG(dva
))
1097 asize
= vdev_gang_header_asize(vd
);
1098 if (offset
+ asize
> vd
->vdev_asize
)
1105 zio_read(zio_t
*pio
, spa_t
*spa
, const blkptr_t
*bp
,
1106 abd_t
*data
, uint64_t size
, zio_done_func_t
*done
, void *private,
1107 zio_priority_t priority
, enum zio_flag flags
, const zbookmark_phys_t
*zb
)
1111 zio
= zio_create(pio
, spa
, BP_PHYSICAL_BIRTH(bp
), bp
,
1112 data
, size
, size
, done
, private,
1113 ZIO_TYPE_READ
, priority
, flags
, NULL
, 0, zb
,
1114 ZIO_STAGE_OPEN
, (flags
& ZIO_FLAG_DDT_CHILD
) ?
1115 ZIO_DDT_CHILD_READ_PIPELINE
: ZIO_READ_PIPELINE
);
1121 zio_write(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, blkptr_t
*bp
,
1122 abd_t
*data
, uint64_t lsize
, uint64_t psize
, const zio_prop_t
*zp
,
1123 zio_done_func_t
*ready
, zio_done_func_t
*children_ready
,
1124 zio_done_func_t
*physdone
, zio_done_func_t
*done
,
1125 void *private, zio_priority_t priority
, enum zio_flag flags
,
1126 const zbookmark_phys_t
*zb
)
1130 ASSERT(zp
->zp_checksum
>= ZIO_CHECKSUM_OFF
&&
1131 zp
->zp_checksum
< ZIO_CHECKSUM_FUNCTIONS
&&
1132 zp
->zp_compress
>= ZIO_COMPRESS_OFF
&&
1133 zp
->zp_compress
< ZIO_COMPRESS_FUNCTIONS
&&
1134 DMU_OT_IS_VALID(zp
->zp_type
) &&
1135 zp
->zp_level
< 32 &&
1136 zp
->zp_copies
> 0 &&
1137 zp
->zp_copies
<= spa_max_replication(spa
));
1139 zio
= zio_create(pio
, spa
, txg
, bp
, data
, lsize
, psize
, done
, private,
1140 ZIO_TYPE_WRITE
, priority
, flags
, NULL
, 0, zb
,
1141 ZIO_STAGE_OPEN
, (flags
& ZIO_FLAG_DDT_CHILD
) ?
1142 ZIO_DDT_CHILD_WRITE_PIPELINE
: ZIO_WRITE_PIPELINE
);
1144 zio
->io_ready
= ready
;
1145 zio
->io_children_ready
= children_ready
;
1146 zio
->io_physdone
= physdone
;
1150 * Data can be NULL if we are going to call zio_write_override() to
1151 * provide the already-allocated BP. But we may need the data to
1152 * verify a dedup hit (if requested). In this case, don't try to
1153 * dedup (just take the already-allocated BP verbatim). Encrypted
1154 * dedup blocks need data as well so we also disable dedup in this
1158 (zio
->io_prop
.zp_dedup_verify
|| zio
->io_prop
.zp_encrypt
)) {
1159 zio
->io_prop
.zp_dedup
= zio
->io_prop
.zp_dedup_verify
= B_FALSE
;
1166 zio_rewrite(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, blkptr_t
*bp
, abd_t
*data
,
1167 uint64_t size
, zio_done_func_t
*done
, void *private,
1168 zio_priority_t priority
, enum zio_flag flags
, zbookmark_phys_t
*zb
)
1172 zio
= zio_create(pio
, spa
, txg
, bp
, data
, size
, size
, done
, private,
1173 ZIO_TYPE_WRITE
, priority
, flags
| ZIO_FLAG_IO_REWRITE
, NULL
, 0, zb
,
1174 ZIO_STAGE_OPEN
, ZIO_REWRITE_PIPELINE
);
1180 zio_write_override(zio_t
*zio
, blkptr_t
*bp
, int copies
, boolean_t nopwrite
)
1182 ASSERT(zio
->io_type
== ZIO_TYPE_WRITE
);
1183 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1184 ASSERT(zio
->io_stage
== ZIO_STAGE_OPEN
);
1185 ASSERT(zio
->io_txg
== spa_syncing_txg(zio
->io_spa
));
1188 * We must reset the io_prop to match the values that existed
1189 * when the bp was first written by dmu_sync() keeping in mind
1190 * that nopwrite and dedup are mutually exclusive.
1192 zio
->io_prop
.zp_dedup
= nopwrite
? B_FALSE
: zio
->io_prop
.zp_dedup
;
1193 zio
->io_prop
.zp_nopwrite
= nopwrite
;
1194 zio
->io_prop
.zp_copies
= copies
;
1195 zio
->io_bp_override
= bp
;
1199 zio_free(spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
)
1202 (void) zfs_blkptr_verify(spa
, bp
, B_FALSE
, BLK_VERIFY_HALT
);
1205 * The check for EMBEDDED is a performance optimization. We
1206 * process the free here (by ignoring it) rather than
1207 * putting it on the list and then processing it in zio_free_sync().
1209 if (BP_IS_EMBEDDED(bp
))
1211 metaslab_check_free(spa
, bp
);
1214 * Frees that are for the currently-syncing txg, are not going to be
1215 * deferred, and which will not need to do a read (i.e. not GANG or
1216 * DEDUP), can be processed immediately. Otherwise, put them on the
1217 * in-memory list for later processing.
1219 * Note that we only defer frees after zfs_sync_pass_deferred_free
1220 * when the log space map feature is disabled. [see relevant comment
1221 * in spa_sync_iterate_to_convergence()]
1223 if (BP_IS_GANG(bp
) ||
1225 txg
!= spa
->spa_syncing_txg
||
1226 (spa_sync_pass(spa
) >= zfs_sync_pass_deferred_free
&&
1227 !spa_feature_is_active(spa
, SPA_FEATURE_LOG_SPACEMAP
))) {
1228 bplist_append(&spa
->spa_free_bplist
[txg
& TXG_MASK
], bp
);
1230 VERIFY3P(zio_free_sync(NULL
, spa
, txg
, bp
, 0), ==, NULL
);
1235 * To improve performance, this function may return NULL if we were able
1236 * to do the free immediately. This avoids the cost of creating a zio
1237 * (and linking it to the parent, etc).
1240 zio_free_sync(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
,
1241 enum zio_flag flags
)
1243 ASSERT(!BP_IS_HOLE(bp
));
1244 ASSERT(spa_syncing_txg(spa
) == txg
);
1246 if (BP_IS_EMBEDDED(bp
))
1249 metaslab_check_free(spa
, bp
);
1251 dsl_scan_freed(spa
, bp
);
1253 if (BP_IS_GANG(bp
) || BP_GET_DEDUP(bp
)) {
1255 * GANG and DEDUP blocks can induce a read (for the gang block
1256 * header, or the DDT), so issue them asynchronously so that
1257 * this thread is not tied up.
1259 enum zio_stage stage
=
1260 ZIO_FREE_PIPELINE
| ZIO_STAGE_ISSUE_ASYNC
;
1262 return (zio_create(pio
, spa
, txg
, bp
, NULL
, BP_GET_PSIZE(bp
),
1263 BP_GET_PSIZE(bp
), NULL
, NULL
,
1264 ZIO_TYPE_FREE
, ZIO_PRIORITY_NOW
,
1265 flags
, NULL
, 0, NULL
, ZIO_STAGE_OPEN
, stage
));
1267 metaslab_free(spa
, bp
, txg
, B_FALSE
);
1273 zio_claim(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
,
1274 zio_done_func_t
*done
, void *private, enum zio_flag flags
)
1278 (void) zfs_blkptr_verify(spa
, bp
, flags
& ZIO_FLAG_CONFIG_WRITER
,
1281 if (BP_IS_EMBEDDED(bp
))
1282 return (zio_null(pio
, spa
, NULL
, NULL
, NULL
, 0));
1285 * A claim is an allocation of a specific block. Claims are needed
1286 * to support immediate writes in the intent log. The issue is that
1287 * immediate writes contain committed data, but in a txg that was
1288 * *not* committed. Upon opening the pool after an unclean shutdown,
1289 * the intent log claims all blocks that contain immediate write data
1290 * so that the SPA knows they're in use.
1292 * All claims *must* be resolved in the first txg -- before the SPA
1293 * starts allocating blocks -- so that nothing is allocated twice.
1294 * If txg == 0 we just verify that the block is claimable.
1296 ASSERT3U(spa
->spa_uberblock
.ub_rootbp
.blk_birth
, <,
1297 spa_min_claim_txg(spa
));
1298 ASSERT(txg
== spa_min_claim_txg(spa
) || txg
== 0);
1299 ASSERT(!BP_GET_DEDUP(bp
) || !spa_writeable(spa
)); /* zdb(8) */
1301 zio
= zio_create(pio
, spa
, txg
, bp
, NULL
, BP_GET_PSIZE(bp
),
1302 BP_GET_PSIZE(bp
), done
, private, ZIO_TYPE_CLAIM
, ZIO_PRIORITY_NOW
,
1303 flags
, NULL
, 0, NULL
, ZIO_STAGE_OPEN
, ZIO_CLAIM_PIPELINE
);
1304 ASSERT0(zio
->io_queued_timestamp
);
1310 zio_ioctl(zio_t
*pio
, spa_t
*spa
, vdev_t
*vd
, int cmd
,
1311 zio_done_func_t
*done
, void *private, enum zio_flag flags
)
1316 if (vd
->vdev_children
== 0) {
1317 zio
= zio_create(pio
, spa
, 0, NULL
, NULL
, 0, 0, done
, private,
1318 ZIO_TYPE_IOCTL
, ZIO_PRIORITY_NOW
, flags
, vd
, 0, NULL
,
1319 ZIO_STAGE_OPEN
, ZIO_IOCTL_PIPELINE
);
1323 zio
= zio_null(pio
, spa
, NULL
, NULL
, NULL
, flags
);
1325 for (c
= 0; c
< vd
->vdev_children
; c
++)
1326 zio_nowait(zio_ioctl(zio
, spa
, vd
->vdev_child
[c
], cmd
,
1327 done
, private, flags
));
1334 zio_trim(zio_t
*pio
, vdev_t
*vd
, uint64_t offset
, uint64_t size
,
1335 zio_done_func_t
*done
, void *private, zio_priority_t priority
,
1336 enum zio_flag flags
, enum trim_flag trim_flags
)
1340 ASSERT0(vd
->vdev_children
);
1341 ASSERT0(P2PHASE(offset
, 1ULL << vd
->vdev_ashift
));
1342 ASSERT0(P2PHASE(size
, 1ULL << vd
->vdev_ashift
));
1343 ASSERT3U(size
, !=, 0);
1345 zio
= zio_create(pio
, vd
->vdev_spa
, 0, NULL
, NULL
, size
, size
, done
,
1346 private, ZIO_TYPE_TRIM
, priority
, flags
| ZIO_FLAG_PHYSICAL
,
1347 vd
, offset
, NULL
, ZIO_STAGE_OPEN
, ZIO_TRIM_PIPELINE
);
1348 zio
->io_trim_flags
= trim_flags
;
1354 zio_read_phys(zio_t
*pio
, vdev_t
*vd
, uint64_t offset
, uint64_t size
,
1355 abd_t
*data
, int checksum
, zio_done_func_t
*done
, void *private,
1356 zio_priority_t priority
, enum zio_flag flags
, boolean_t labels
)
1360 ASSERT(vd
->vdev_children
== 0);
1361 ASSERT(!labels
|| offset
+ size
<= VDEV_LABEL_START_SIZE
||
1362 offset
>= vd
->vdev_psize
- VDEV_LABEL_END_SIZE
);
1363 ASSERT3U(offset
+ size
, <=, vd
->vdev_psize
);
1365 zio
= zio_create(pio
, vd
->vdev_spa
, 0, NULL
, data
, size
, size
, done
,
1366 private, ZIO_TYPE_READ
, priority
, flags
| ZIO_FLAG_PHYSICAL
, vd
,
1367 offset
, NULL
, ZIO_STAGE_OPEN
, ZIO_READ_PHYS_PIPELINE
);
1369 zio
->io_prop
.zp_checksum
= checksum
;
1375 zio_write_phys(zio_t
*pio
, vdev_t
*vd
, uint64_t offset
, uint64_t size
,
1376 abd_t
*data
, int checksum
, zio_done_func_t
*done
, void *private,
1377 zio_priority_t priority
, enum zio_flag flags
, boolean_t labels
)
1381 ASSERT(vd
->vdev_children
== 0);
1382 ASSERT(!labels
|| offset
+ size
<= VDEV_LABEL_START_SIZE
||
1383 offset
>= vd
->vdev_psize
- VDEV_LABEL_END_SIZE
);
1384 ASSERT3U(offset
+ size
, <=, vd
->vdev_psize
);
1386 zio
= zio_create(pio
, vd
->vdev_spa
, 0, NULL
, data
, size
, size
, done
,
1387 private, ZIO_TYPE_WRITE
, priority
, flags
| ZIO_FLAG_PHYSICAL
, vd
,
1388 offset
, NULL
, ZIO_STAGE_OPEN
, ZIO_WRITE_PHYS_PIPELINE
);
1390 zio
->io_prop
.zp_checksum
= checksum
;
1392 if (zio_checksum_table
[checksum
].ci_flags
& ZCHECKSUM_FLAG_EMBEDDED
) {
1394 * zec checksums are necessarily destructive -- they modify
1395 * the end of the write buffer to hold the verifier/checksum.
1396 * Therefore, we must make a local copy in case the data is
1397 * being written to multiple places in parallel.
1399 abd_t
*wbuf
= abd_alloc_sametype(data
, size
);
1400 abd_copy(wbuf
, data
, size
);
1402 zio_push_transform(zio
, wbuf
, size
, size
, NULL
);
1409 * Create a child I/O to do some work for us.
1412 zio_vdev_child_io(zio_t
*pio
, blkptr_t
*bp
, vdev_t
*vd
, uint64_t offset
,
1413 abd_t
*data
, uint64_t size
, int type
, zio_priority_t priority
,
1414 enum zio_flag flags
, zio_done_func_t
*done
, void *private)
1416 enum zio_stage pipeline
= ZIO_VDEV_CHILD_PIPELINE
;
1420 * vdev child I/Os do not propagate their error to the parent.
1421 * Therefore, for correct operation the caller *must* check for
1422 * and handle the error in the child i/o's done callback.
1423 * The only exceptions are i/os that we don't care about
1424 * (OPTIONAL or REPAIR).
1426 ASSERT((flags
& ZIO_FLAG_OPTIONAL
) || (flags
& ZIO_FLAG_IO_REPAIR
) ||
1429 if (type
== ZIO_TYPE_READ
&& bp
!= NULL
) {
1431 * If we have the bp, then the child should perform the
1432 * checksum and the parent need not. This pushes error
1433 * detection as close to the leaves as possible and
1434 * eliminates redundant checksums in the interior nodes.
1436 pipeline
|= ZIO_STAGE_CHECKSUM_VERIFY
;
1437 pio
->io_pipeline
&= ~ZIO_STAGE_CHECKSUM_VERIFY
;
1440 if (vd
->vdev_ops
->vdev_op_leaf
) {
1441 ASSERT0(vd
->vdev_children
);
1442 offset
+= VDEV_LABEL_START_SIZE
;
1445 flags
|= ZIO_VDEV_CHILD_FLAGS(pio
);
1448 * If we've decided to do a repair, the write is not speculative --
1449 * even if the original read was.
1451 if (flags
& ZIO_FLAG_IO_REPAIR
)
1452 flags
&= ~ZIO_FLAG_SPECULATIVE
;
1455 * If we're creating a child I/O that is not associated with a
1456 * top-level vdev, then the child zio is not an allocating I/O.
1457 * If this is a retried I/O then we ignore it since we will
1458 * have already processed the original allocating I/O.
1460 if (flags
& ZIO_FLAG_IO_ALLOCATING
&&
1461 (vd
!= vd
->vdev_top
|| (flags
& ZIO_FLAG_IO_RETRY
))) {
1462 ASSERT(pio
->io_metaslab_class
!= NULL
);
1463 ASSERT(pio
->io_metaslab_class
->mc_alloc_throttle_enabled
);
1464 ASSERT(type
== ZIO_TYPE_WRITE
);
1465 ASSERT(priority
== ZIO_PRIORITY_ASYNC_WRITE
);
1466 ASSERT(!(flags
& ZIO_FLAG_IO_REPAIR
));
1467 ASSERT(!(pio
->io_flags
& ZIO_FLAG_IO_REWRITE
) ||
1468 pio
->io_child_type
== ZIO_CHILD_GANG
);
1470 flags
&= ~ZIO_FLAG_IO_ALLOCATING
;
1474 zio
= zio_create(pio
, pio
->io_spa
, pio
->io_txg
, bp
, data
, size
, size
,
1475 done
, private, type
, priority
, flags
, vd
, offset
, &pio
->io_bookmark
,
1476 ZIO_STAGE_VDEV_IO_START
>> 1, pipeline
);
1477 ASSERT3U(zio
->io_child_type
, ==, ZIO_CHILD_VDEV
);
1479 zio
->io_physdone
= pio
->io_physdone
;
1480 if (vd
->vdev_ops
->vdev_op_leaf
&& zio
->io_logical
!= NULL
)
1481 zio
->io_logical
->io_phys_children
++;
1487 zio_vdev_delegated_io(vdev_t
*vd
, uint64_t offset
, abd_t
*data
, uint64_t size
,
1488 zio_type_t type
, zio_priority_t priority
, enum zio_flag flags
,
1489 zio_done_func_t
*done
, void *private)
1493 ASSERT(vd
->vdev_ops
->vdev_op_leaf
);
1495 zio
= zio_create(NULL
, vd
->vdev_spa
, 0, NULL
,
1496 data
, size
, size
, done
, private, type
, priority
,
1497 flags
| ZIO_FLAG_CANFAIL
| ZIO_FLAG_DONT_RETRY
| ZIO_FLAG_DELEGATED
,
1499 ZIO_STAGE_VDEV_IO_START
>> 1, ZIO_VDEV_CHILD_PIPELINE
);
1505 zio_flush(zio_t
*zio
, vdev_t
*vd
)
1507 zio_nowait(zio_ioctl(zio
, zio
->io_spa
, vd
, DKIOCFLUSHWRITECACHE
,
1509 ZIO_FLAG_CANFAIL
| ZIO_FLAG_DONT_PROPAGATE
| ZIO_FLAG_DONT_RETRY
));
1513 zio_shrink(zio_t
*zio
, uint64_t size
)
1515 ASSERT3P(zio
->io_executor
, ==, NULL
);
1516 ASSERT3U(zio
->io_orig_size
, ==, zio
->io_size
);
1517 ASSERT3U(size
, <=, zio
->io_size
);
1520 * We don't shrink for raidz because of problems with the
1521 * reconstruction when reading back less than the block size.
1522 * Note, BP_IS_RAIDZ() assumes no compression.
1524 ASSERT(BP_GET_COMPRESS(zio
->io_bp
) == ZIO_COMPRESS_OFF
);
1525 if (!BP_IS_RAIDZ(zio
->io_bp
)) {
1526 /* we are not doing a raw write */
1527 ASSERT3U(zio
->io_size
, ==, zio
->io_lsize
);
1528 zio
->io_orig_size
= zio
->io_size
= zio
->io_lsize
= size
;
1533 * ==========================================================================
1534 * Prepare to read and write logical blocks
1535 * ==========================================================================
1539 zio_read_bp_init(zio_t
*zio
)
1541 blkptr_t
*bp
= zio
->io_bp
;
1543 BP_IS_EMBEDDED(bp
) ? BPE_GET_PSIZE(bp
) : BP_GET_PSIZE(bp
);
1545 ASSERT3P(zio
->io_bp
, ==, &zio
->io_bp_copy
);
1547 if (BP_GET_COMPRESS(bp
) != ZIO_COMPRESS_OFF
&&
1548 zio
->io_child_type
== ZIO_CHILD_LOGICAL
&&
1549 !(zio
->io_flags
& ZIO_FLAG_RAW_COMPRESS
)) {
1550 zio_push_transform(zio
, abd_alloc_sametype(zio
->io_abd
, psize
),
1551 psize
, psize
, zio_decompress
);
1554 if (((BP_IS_PROTECTED(bp
) && !(zio
->io_flags
& ZIO_FLAG_RAW_ENCRYPT
)) ||
1555 BP_HAS_INDIRECT_MAC_CKSUM(bp
)) &&
1556 zio
->io_child_type
== ZIO_CHILD_LOGICAL
) {
1557 zio_push_transform(zio
, abd_alloc_sametype(zio
->io_abd
, psize
),
1558 psize
, psize
, zio_decrypt
);
1561 if (BP_IS_EMBEDDED(bp
) && BPE_GET_ETYPE(bp
) == BP_EMBEDDED_TYPE_DATA
) {
1562 int psize
= BPE_GET_PSIZE(bp
);
1563 void *data
= abd_borrow_buf(zio
->io_abd
, psize
);
1565 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1566 decode_embedded_bp_compressed(bp
, data
);
1567 abd_return_buf_copy(zio
->io_abd
, data
, psize
);
1569 ASSERT(!BP_IS_EMBEDDED(bp
));
1570 ASSERT3P(zio
->io_bp
, ==, &zio
->io_bp_copy
);
1573 if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp
)) && BP_GET_LEVEL(bp
) == 0)
1574 zio
->io_flags
|= ZIO_FLAG_DONT_CACHE
;
1576 if (BP_GET_TYPE(bp
) == DMU_OT_DDT_ZAP
)
1577 zio
->io_flags
|= ZIO_FLAG_DONT_CACHE
;
1579 if (BP_GET_DEDUP(bp
) && zio
->io_child_type
== ZIO_CHILD_LOGICAL
)
1580 zio
->io_pipeline
= ZIO_DDT_READ_PIPELINE
;
1586 zio_write_bp_init(zio_t
*zio
)
1588 if (!IO_IS_ALLOCATING(zio
))
1591 ASSERT(zio
->io_child_type
!= ZIO_CHILD_DDT
);
1593 if (zio
->io_bp_override
) {
1594 blkptr_t
*bp
= zio
->io_bp
;
1595 zio_prop_t
*zp
= &zio
->io_prop
;
1597 ASSERT(bp
->blk_birth
!= zio
->io_txg
);
1598 ASSERT(BP_GET_DEDUP(zio
->io_bp_override
) == 0);
1600 *bp
= *zio
->io_bp_override
;
1601 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1603 if (BP_IS_EMBEDDED(bp
))
1607 * If we've been overridden and nopwrite is set then
1608 * set the flag accordingly to indicate that a nopwrite
1609 * has already occurred.
1611 if (!BP_IS_HOLE(bp
) && zp
->zp_nopwrite
) {
1612 ASSERT(!zp
->zp_dedup
);
1613 ASSERT3U(BP_GET_CHECKSUM(bp
), ==, zp
->zp_checksum
);
1614 zio
->io_flags
|= ZIO_FLAG_NOPWRITE
;
1618 ASSERT(!zp
->zp_nopwrite
);
1620 if (BP_IS_HOLE(bp
) || !zp
->zp_dedup
)
1623 ASSERT((zio_checksum_table
[zp
->zp_checksum
].ci_flags
&
1624 ZCHECKSUM_FLAG_DEDUP
) || zp
->zp_dedup_verify
);
1626 if (BP_GET_CHECKSUM(bp
) == zp
->zp_checksum
&&
1628 BP_SET_DEDUP(bp
, 1);
1629 zio
->io_pipeline
|= ZIO_STAGE_DDT_WRITE
;
1634 * We were unable to handle this as an override bp, treat
1635 * it as a regular write I/O.
1637 zio
->io_bp_override
= NULL
;
1638 *bp
= zio
->io_bp_orig
;
1639 zio
->io_pipeline
= zio
->io_orig_pipeline
;
1646 zio_write_compress(zio_t
*zio
)
1648 spa_t
*spa
= zio
->io_spa
;
1649 zio_prop_t
*zp
= &zio
->io_prop
;
1650 enum zio_compress compress
= zp
->zp_compress
;
1651 blkptr_t
*bp
= zio
->io_bp
;
1652 uint64_t lsize
= zio
->io_lsize
;
1653 uint64_t psize
= zio
->io_size
;
1657 * If our children haven't all reached the ready stage,
1658 * wait for them and then repeat this pipeline stage.
1660 if (zio_wait_for_children(zio
, ZIO_CHILD_LOGICAL_BIT
|
1661 ZIO_CHILD_GANG_BIT
, ZIO_WAIT_READY
)) {
1665 if (!IO_IS_ALLOCATING(zio
))
1668 if (zio
->io_children_ready
!= NULL
) {
1670 * Now that all our children are ready, run the callback
1671 * associated with this zio in case it wants to modify the
1672 * data to be written.
1674 ASSERT3U(zp
->zp_level
, >, 0);
1675 zio
->io_children_ready(zio
);
1678 ASSERT(zio
->io_child_type
!= ZIO_CHILD_DDT
);
1679 ASSERT(zio
->io_bp_override
== NULL
);
1681 if (!BP_IS_HOLE(bp
) && bp
->blk_birth
== zio
->io_txg
) {
1683 * We're rewriting an existing block, which means we're
1684 * working on behalf of spa_sync(). For spa_sync() to
1685 * converge, it must eventually be the case that we don't
1686 * have to allocate new blocks. But compression changes
1687 * the blocksize, which forces a reallocate, and makes
1688 * convergence take longer. Therefore, after the first
1689 * few passes, stop compressing to ensure convergence.
1691 pass
= spa_sync_pass(spa
);
1693 ASSERT(zio
->io_txg
== spa_syncing_txg(spa
));
1694 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1695 ASSERT(!BP_GET_DEDUP(bp
));
1697 if (pass
>= zfs_sync_pass_dont_compress
)
1698 compress
= ZIO_COMPRESS_OFF
;
1700 /* Make sure someone doesn't change their mind on overwrites */
1701 ASSERT(BP_IS_EMBEDDED(bp
) || MIN(zp
->zp_copies
+ BP_IS_GANG(bp
),
1702 spa_max_replication(spa
)) == BP_GET_NDVAS(bp
));
1705 /* If it's a compressed write that is not raw, compress the buffer. */
1706 if (compress
!= ZIO_COMPRESS_OFF
&&
1707 !(zio
->io_flags
& ZIO_FLAG_RAW_COMPRESS
)) {
1708 void *cbuf
= zio_buf_alloc(lsize
);
1709 psize
= zio_compress_data(compress
, zio
->io_abd
, cbuf
, lsize
,
1711 if (psize
== 0 || psize
>= lsize
) {
1712 compress
= ZIO_COMPRESS_OFF
;
1713 zio_buf_free(cbuf
, lsize
);
1714 } else if (!zp
->zp_dedup
&& !zp
->zp_encrypt
&&
1715 psize
<= BPE_PAYLOAD_SIZE
&&
1716 zp
->zp_level
== 0 && !DMU_OT_HAS_FILL(zp
->zp_type
) &&
1717 spa_feature_is_enabled(spa
, SPA_FEATURE_EMBEDDED_DATA
)) {
1718 encode_embedded_bp_compressed(bp
,
1719 cbuf
, compress
, lsize
, psize
);
1720 BPE_SET_ETYPE(bp
, BP_EMBEDDED_TYPE_DATA
);
1721 BP_SET_TYPE(bp
, zio
->io_prop
.zp_type
);
1722 BP_SET_LEVEL(bp
, zio
->io_prop
.zp_level
);
1723 zio_buf_free(cbuf
, lsize
);
1724 bp
->blk_birth
= zio
->io_txg
;
1725 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1726 ASSERT(spa_feature_is_active(spa
,
1727 SPA_FEATURE_EMBEDDED_DATA
));
1731 * Round compressed size up to the minimum allocation
1732 * size of the smallest-ashift device, and zero the
1733 * tail. This ensures that the compressed size of the
1734 * BP (and thus compressratio property) are correct,
1735 * in that we charge for the padding used to fill out
1738 ASSERT3U(spa
->spa_min_alloc
, >=, SPA_MINBLOCKSHIFT
);
1739 size_t rounded
= (size_t)roundup(psize
,
1740 spa
->spa_min_alloc
);
1741 if (rounded
>= lsize
) {
1742 compress
= ZIO_COMPRESS_OFF
;
1743 zio_buf_free(cbuf
, lsize
);
1746 abd_t
*cdata
= abd_get_from_buf(cbuf
, lsize
);
1747 abd_take_ownership_of_buf(cdata
, B_TRUE
);
1748 abd_zero_off(cdata
, psize
, rounded
- psize
);
1750 zio_push_transform(zio
, cdata
,
1751 psize
, lsize
, NULL
);
1756 * We were unable to handle this as an override bp, treat
1757 * it as a regular write I/O.
1759 zio
->io_bp_override
= NULL
;
1760 *bp
= zio
->io_bp_orig
;
1761 zio
->io_pipeline
= zio
->io_orig_pipeline
;
1763 } else if ((zio
->io_flags
& ZIO_FLAG_RAW_ENCRYPT
) != 0 &&
1764 zp
->zp_type
== DMU_OT_DNODE
) {
1766 * The DMU actually relies on the zio layer's compression
1767 * to free metadnode blocks that have had all contained
1768 * dnodes freed. As a result, even when doing a raw
1769 * receive, we must check whether the block can be compressed
1772 psize
= zio_compress_data(ZIO_COMPRESS_EMPTY
,
1773 zio
->io_abd
, NULL
, lsize
, zp
->zp_complevel
);
1774 if (psize
== 0 || psize
>= lsize
)
1775 compress
= ZIO_COMPRESS_OFF
;
1776 } else if (zio
->io_flags
& ZIO_FLAG_RAW_COMPRESS
) {
1777 size_t rounded
= MIN((size_t)roundup(psize
,
1778 spa
->spa_min_alloc
), lsize
);
1780 if (rounded
!= psize
) {
1781 abd_t
*cdata
= abd_alloc_linear(rounded
, B_TRUE
);
1782 abd_zero_off(cdata
, psize
, rounded
- psize
);
1783 abd_copy_off(cdata
, zio
->io_abd
, 0, 0, psize
);
1785 zio_push_transform(zio
, cdata
,
1786 psize
, rounded
, NULL
);
1789 ASSERT3U(psize
, !=, 0);
1793 * The final pass of spa_sync() must be all rewrites, but the first
1794 * few passes offer a trade-off: allocating blocks defers convergence,
1795 * but newly allocated blocks are sequential, so they can be written
1796 * to disk faster. Therefore, we allow the first few passes of
1797 * spa_sync() to allocate new blocks, but force rewrites after that.
1798 * There should only be a handful of blocks after pass 1 in any case.
1800 if (!BP_IS_HOLE(bp
) && bp
->blk_birth
== zio
->io_txg
&&
1801 BP_GET_PSIZE(bp
) == psize
&&
1802 pass
>= zfs_sync_pass_rewrite
) {
1803 VERIFY3U(psize
, !=, 0);
1804 enum zio_stage gang_stages
= zio
->io_pipeline
& ZIO_GANG_STAGES
;
1806 zio
->io_pipeline
= ZIO_REWRITE_PIPELINE
| gang_stages
;
1807 zio
->io_flags
|= ZIO_FLAG_IO_REWRITE
;
1810 zio
->io_pipeline
= ZIO_WRITE_PIPELINE
;
1814 if (zio
->io_bp_orig
.blk_birth
!= 0 &&
1815 spa_feature_is_active(spa
, SPA_FEATURE_HOLE_BIRTH
)) {
1816 BP_SET_LSIZE(bp
, lsize
);
1817 BP_SET_TYPE(bp
, zp
->zp_type
);
1818 BP_SET_LEVEL(bp
, zp
->zp_level
);
1819 BP_SET_BIRTH(bp
, zio
->io_txg
, 0);
1821 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1823 ASSERT(zp
->zp_checksum
!= ZIO_CHECKSUM_GANG_HEADER
);
1824 BP_SET_LSIZE(bp
, lsize
);
1825 BP_SET_TYPE(bp
, zp
->zp_type
);
1826 BP_SET_LEVEL(bp
, zp
->zp_level
);
1827 BP_SET_PSIZE(bp
, psize
);
1828 BP_SET_COMPRESS(bp
, compress
);
1829 BP_SET_CHECKSUM(bp
, zp
->zp_checksum
);
1830 BP_SET_DEDUP(bp
, zp
->zp_dedup
);
1831 BP_SET_BYTEORDER(bp
, ZFS_HOST_BYTEORDER
);
1833 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1834 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_REWRITE
));
1835 ASSERT(!zp
->zp_encrypt
||
1836 DMU_OT_IS_ENCRYPTED(zp
->zp_type
));
1837 zio
->io_pipeline
= ZIO_DDT_WRITE_PIPELINE
;
1839 if (zp
->zp_nopwrite
) {
1840 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1841 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_REWRITE
));
1842 zio
->io_pipeline
|= ZIO_STAGE_NOP_WRITE
;
1849 zio_free_bp_init(zio_t
*zio
)
1851 blkptr_t
*bp
= zio
->io_bp
;
1853 if (zio
->io_child_type
== ZIO_CHILD_LOGICAL
) {
1854 if (BP_GET_DEDUP(bp
))
1855 zio
->io_pipeline
= ZIO_DDT_FREE_PIPELINE
;
1858 ASSERT3P(zio
->io_bp
, ==, &zio
->io_bp_copy
);
1864 * ==========================================================================
1865 * Execute the I/O pipeline
1866 * ==========================================================================
1870 zio_taskq_dispatch(zio_t
*zio
, zio_taskq_type_t q
, boolean_t cutinline
)
1872 spa_t
*spa
= zio
->io_spa
;
1873 zio_type_t t
= zio
->io_type
;
1874 int flags
= (cutinline
? TQ_FRONT
: 0);
1877 * If we're a config writer or a probe, the normal issue and
1878 * interrupt threads may all be blocked waiting for the config lock.
1879 * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL.
1881 if (zio
->io_flags
& (ZIO_FLAG_CONFIG_WRITER
| ZIO_FLAG_PROBE
))
1885 * A similar issue exists for the L2ARC write thread until L2ARC 2.0.
1887 if (t
== ZIO_TYPE_WRITE
&& zio
->io_vd
&& zio
->io_vd
->vdev_aux
)
1891 * If this is a high priority I/O, then use the high priority taskq if
1894 if ((zio
->io_priority
== ZIO_PRIORITY_NOW
||
1895 zio
->io_priority
== ZIO_PRIORITY_SYNC_WRITE
) &&
1896 spa
->spa_zio_taskq
[t
][q
+ 1].stqs_count
!= 0)
1899 ASSERT3U(q
, <, ZIO_TASKQ_TYPES
);
1902 * NB: We are assuming that the zio can only be dispatched
1903 * to a single taskq at a time. It would be a grievous error
1904 * to dispatch the zio to another taskq at the same time.
1906 ASSERT(taskq_empty_ent(&zio
->io_tqent
));
1907 spa_taskq_dispatch_ent(spa
, t
, q
, zio_execute
, zio
, flags
,
1912 zio_taskq_member(zio_t
*zio
, zio_taskq_type_t q
)
1914 spa_t
*spa
= zio
->io_spa
;
1916 taskq_t
*tq
= taskq_of_curthread();
1918 for (zio_type_t t
= 0; t
< ZIO_TYPES
; t
++) {
1919 spa_taskqs_t
*tqs
= &spa
->spa_zio_taskq
[t
][q
];
1921 for (i
= 0; i
< tqs
->stqs_count
; i
++) {
1922 if (tqs
->stqs_taskq
[i
] == tq
)
1931 zio_issue_async(zio_t
*zio
)
1933 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, B_FALSE
);
1939 zio_interrupt(void *zio
)
1941 zio_taskq_dispatch(zio
, ZIO_TASKQ_INTERRUPT
, B_FALSE
);
1945 zio_delay_interrupt(zio_t
*zio
)
1948 * The timeout_generic() function isn't defined in userspace, so
1949 * rather than trying to implement the function, the zio delay
1950 * functionality has been disabled for userspace builds.
1955 * If io_target_timestamp is zero, then no delay has been registered
1956 * for this IO, thus jump to the end of this function and "skip" the
1957 * delay; issuing it directly to the zio layer.
1959 if (zio
->io_target_timestamp
!= 0) {
1960 hrtime_t now
= gethrtime();
1962 if (now
>= zio
->io_target_timestamp
) {
1964 * This IO has already taken longer than the target
1965 * delay to complete, so we don't want to delay it
1966 * any longer; we "miss" the delay and issue it
1967 * directly to the zio layer. This is likely due to
1968 * the target latency being set to a value less than
1969 * the underlying hardware can satisfy (e.g. delay
1970 * set to 1ms, but the disks take 10ms to complete an
1974 DTRACE_PROBE2(zio__delay__miss
, zio_t
*, zio
,
1980 hrtime_t diff
= zio
->io_target_timestamp
- now
;
1981 clock_t expire_at_tick
= ddi_get_lbolt() +
1984 DTRACE_PROBE3(zio__delay__hit
, zio_t
*, zio
,
1985 hrtime_t
, now
, hrtime_t
, diff
);
1987 if (NSEC_TO_TICK(diff
) == 0) {
1988 /* Our delay is less than a jiffy - just spin */
1989 zfs_sleep_until(zio
->io_target_timestamp
);
1993 * Use taskq_dispatch_delay() in the place of
1994 * OpenZFS's timeout_generic().
1996 tid
= taskq_dispatch_delay(system_taskq
,
1997 zio_interrupt
, zio
, TQ_NOSLEEP
,
1999 if (tid
== TASKQID_INVALID
) {
2001 * Couldn't allocate a task. Just
2002 * finish the zio without a delay.
2011 DTRACE_PROBE1(zio__delay__skip
, zio_t
*, zio
);
2016 zio_deadman_impl(zio_t
*pio
, int ziodepth
)
2018 zio_t
*cio
, *cio_next
;
2019 zio_link_t
*zl
= NULL
;
2020 vdev_t
*vd
= pio
->io_vd
;
2022 if (zio_deadman_log_all
|| (vd
!= NULL
&& vd
->vdev_ops
->vdev_op_leaf
)) {
2023 vdev_queue_t
*vq
= vd
? &vd
->vdev_queue
: NULL
;
2024 zbookmark_phys_t
*zb
= &pio
->io_bookmark
;
2025 uint64_t delta
= gethrtime() - pio
->io_timestamp
;
2026 uint64_t failmode
= spa_get_deadman_failmode(pio
->io_spa
);
2028 zfs_dbgmsg("slow zio[%d]: zio=%px timestamp=%llu "
2029 "delta=%llu queued=%llu io=%llu "
2031 "last=%llu type=%d "
2032 "priority=%d flags=0x%x stage=0x%x "
2033 "pipeline=0x%x pipeline-trace=0x%x "
2034 "objset=%llu object=%llu "
2035 "level=%llu blkid=%llu "
2036 "offset=%llu size=%llu "
2038 ziodepth
, pio
, pio
->io_timestamp
,
2039 (u_longlong_t
)delta
, pio
->io_delta
, pio
->io_delay
,
2040 vd
? vd
->vdev_path
: "NULL",
2041 vq
? vq
->vq_io_complete_ts
: 0, pio
->io_type
,
2042 pio
->io_priority
, pio
->io_flags
, pio
->io_stage
,
2043 pio
->io_pipeline
, pio
->io_pipeline_trace
,
2044 (u_longlong_t
)zb
->zb_objset
, (u_longlong_t
)zb
->zb_object
,
2045 (u_longlong_t
)zb
->zb_level
, (u_longlong_t
)zb
->zb_blkid
,
2046 (u_longlong_t
)pio
->io_offset
, (u_longlong_t
)pio
->io_size
,
2048 (void) zfs_ereport_post(FM_EREPORT_ZFS_DEADMAN
,
2049 pio
->io_spa
, vd
, zb
, pio
, 0);
2051 if (failmode
== ZIO_FAILURE_MODE_CONTINUE
&&
2052 taskq_empty_ent(&pio
->io_tqent
)) {
2057 mutex_enter(&pio
->io_lock
);
2058 for (cio
= zio_walk_children(pio
, &zl
); cio
!= NULL
; cio
= cio_next
) {
2059 cio_next
= zio_walk_children(pio
, &zl
);
2060 zio_deadman_impl(cio
, ziodepth
+ 1);
2062 mutex_exit(&pio
->io_lock
);
2066 * Log the critical information describing this zio and all of its children
2067 * using the zfs_dbgmsg() interface then post deadman event for the ZED.
2070 zio_deadman(zio_t
*pio
, char *tag
)
2072 spa_t
*spa
= pio
->io_spa
;
2073 char *name
= spa_name(spa
);
2075 if (!zfs_deadman_enabled
|| spa_suspended(spa
))
2078 zio_deadman_impl(pio
, 0);
2080 switch (spa_get_deadman_failmode(spa
)) {
2081 case ZIO_FAILURE_MODE_WAIT
:
2082 zfs_dbgmsg("%s waiting for hung I/O to pool '%s'", tag
, name
);
2085 case ZIO_FAILURE_MODE_CONTINUE
:
2086 zfs_dbgmsg("%s restarting hung I/O for pool '%s'", tag
, name
);
2089 case ZIO_FAILURE_MODE_PANIC
:
2090 fm_panic("%s determined I/O to pool '%s' is hung.", tag
, name
);
2096 * Execute the I/O pipeline until one of the following occurs:
2097 * (1) the I/O completes; (2) the pipeline stalls waiting for
2098 * dependent child I/Os; (3) the I/O issues, so we're waiting
2099 * for an I/O completion interrupt; (4) the I/O is delegated by
2100 * vdev-level caching or aggregation; (5) the I/O is deferred
2101 * due to vdev-level queueing; (6) the I/O is handed off to
2102 * another thread. In all cases, the pipeline stops whenever
2103 * there's no CPU work; it never burns a thread in cv_wait_io().
2105 * There's no locking on io_stage because there's no legitimate way
2106 * for multiple threads to be attempting to process the same I/O.
2108 static zio_pipe_stage_t
*zio_pipeline
[];
2111 * zio_execute() is a wrapper around the static function
2112 * __zio_execute() so that we can force __zio_execute() to be
2113 * inlined. This reduces stack overhead which is important
2114 * because __zio_execute() is called recursively in several zio
2115 * code paths. zio_execute() itself cannot be inlined because
2116 * it is externally visible.
2119 zio_execute(void *zio
)
2121 fstrans_cookie_t cookie
;
2123 cookie
= spl_fstrans_mark();
2125 spl_fstrans_unmark(cookie
);
2129 * Used to determine if in the current context the stack is sized large
2130 * enough to allow zio_execute() to be called recursively. A minimum
2131 * stack size of 16K is required to avoid needing to re-dispatch the zio.
2134 zio_execute_stack_check(zio_t
*zio
)
2136 #if !defined(HAVE_LARGE_STACKS)
2137 dsl_pool_t
*dp
= spa_get_dsl(zio
->io_spa
);
2139 /* Executing in txg_sync_thread() context. */
2140 if (dp
&& curthread
== dp
->dp_tx
.tx_sync_thread
)
2143 /* Pool initialization outside of zio_taskq context. */
2144 if (dp
&& spa_is_initializing(dp
->dp_spa
) &&
2145 !zio_taskq_member(zio
, ZIO_TASKQ_ISSUE
) &&
2146 !zio_taskq_member(zio
, ZIO_TASKQ_ISSUE_HIGH
))
2150 #endif /* HAVE_LARGE_STACKS */
2155 __attribute__((always_inline
))
2157 __zio_execute(zio_t
*zio
)
2159 ASSERT3U(zio
->io_queued_timestamp
, >, 0);
2161 while (zio
->io_stage
< ZIO_STAGE_DONE
) {
2162 enum zio_stage pipeline
= zio
->io_pipeline
;
2163 enum zio_stage stage
= zio
->io_stage
;
2165 zio
->io_executor
= curthread
;
2167 ASSERT(!MUTEX_HELD(&zio
->io_lock
));
2168 ASSERT(ISP2(stage
));
2169 ASSERT(zio
->io_stall
== NULL
);
2173 } while ((stage
& pipeline
) == 0);
2175 ASSERT(stage
<= ZIO_STAGE_DONE
);
2178 * If we are in interrupt context and this pipeline stage
2179 * will grab a config lock that is held across I/O,
2180 * or may wait for an I/O that needs an interrupt thread
2181 * to complete, issue async to avoid deadlock.
2183 * For VDEV_IO_START, we cut in line so that the io will
2184 * be sent to disk promptly.
2186 if ((stage
& ZIO_BLOCKING_STAGES
) && zio
->io_vd
== NULL
&&
2187 zio_taskq_member(zio
, ZIO_TASKQ_INTERRUPT
)) {
2188 boolean_t cut
= (stage
== ZIO_STAGE_VDEV_IO_START
) ?
2189 zio_requeue_io_start_cut_in_line
: B_FALSE
;
2190 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, cut
);
2195 * If the current context doesn't have large enough stacks
2196 * the zio must be issued asynchronously to prevent overflow.
2198 if (zio_execute_stack_check(zio
)) {
2199 boolean_t cut
= (stage
== ZIO_STAGE_VDEV_IO_START
) ?
2200 zio_requeue_io_start_cut_in_line
: B_FALSE
;
2201 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, cut
);
2205 zio
->io_stage
= stage
;
2206 zio
->io_pipeline_trace
|= zio
->io_stage
;
2209 * The zio pipeline stage returns the next zio to execute
2210 * (typically the same as this one), or NULL if we should
2213 zio
= zio_pipeline
[highbit64(stage
) - 1](zio
);
2222 * ==========================================================================
2223 * Initiate I/O, either sync or async
2224 * ==========================================================================
2227 zio_wait(zio_t
*zio
)
2230 * Some routines, like zio_free_sync(), may return a NULL zio
2231 * to avoid the performance overhead of creating and then destroying
2232 * an unneeded zio. For the callers' simplicity, we accept a NULL
2233 * zio and ignore it.
2238 long timeout
= MSEC_TO_TICK(zfs_deadman_ziotime_ms
);
2241 ASSERT3S(zio
->io_stage
, ==, ZIO_STAGE_OPEN
);
2242 ASSERT3P(zio
->io_executor
, ==, NULL
);
2244 zio
->io_waiter
= curthread
;
2245 ASSERT0(zio
->io_queued_timestamp
);
2246 zio
->io_queued_timestamp
= gethrtime();
2250 mutex_enter(&zio
->io_lock
);
2251 while (zio
->io_executor
!= NULL
) {
2252 error
= cv_timedwait_io(&zio
->io_cv
, &zio
->io_lock
,
2253 ddi_get_lbolt() + timeout
);
2255 if (zfs_deadman_enabled
&& error
== -1 &&
2256 gethrtime() - zio
->io_queued_timestamp
>
2257 spa_deadman_ziotime(zio
->io_spa
)) {
2258 mutex_exit(&zio
->io_lock
);
2259 timeout
= MSEC_TO_TICK(zfs_deadman_checktime_ms
);
2260 zio_deadman(zio
, FTAG
);
2261 mutex_enter(&zio
->io_lock
);
2264 mutex_exit(&zio
->io_lock
);
2266 error
= zio
->io_error
;
2273 zio_nowait(zio_t
*zio
)
2276 * See comment in zio_wait().
2281 ASSERT3P(zio
->io_executor
, ==, NULL
);
2283 if (zio
->io_child_type
== ZIO_CHILD_LOGICAL
&&
2284 zio_unique_parent(zio
) == NULL
) {
2288 * This is a logical async I/O with no parent to wait for it.
2289 * We add it to the spa_async_root_zio "Godfather" I/O which
2290 * will ensure they complete prior to unloading the pool.
2292 spa_t
*spa
= zio
->io_spa
;
2293 pio
= spa
->spa_async_zio_root
[CPU_SEQID_UNSTABLE
];
2295 zio_add_child(pio
, zio
);
2298 ASSERT0(zio
->io_queued_timestamp
);
2299 zio
->io_queued_timestamp
= gethrtime();
2304 * ==========================================================================
2305 * Reexecute, cancel, or suspend/resume failed I/O
2306 * ==========================================================================
2310 zio_reexecute(void *arg
)
2313 zio_t
*cio
, *cio_next
;
2315 ASSERT(pio
->io_child_type
== ZIO_CHILD_LOGICAL
);
2316 ASSERT(pio
->io_orig_stage
== ZIO_STAGE_OPEN
);
2317 ASSERT(pio
->io_gang_leader
== NULL
);
2318 ASSERT(pio
->io_gang_tree
== NULL
);
2320 pio
->io_flags
= pio
->io_orig_flags
;
2321 pio
->io_stage
= pio
->io_orig_stage
;
2322 pio
->io_pipeline
= pio
->io_orig_pipeline
;
2323 pio
->io_reexecute
= 0;
2324 pio
->io_flags
|= ZIO_FLAG_REEXECUTED
;
2325 pio
->io_pipeline_trace
= 0;
2327 for (int w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
2328 pio
->io_state
[w
] = 0;
2329 for (int c
= 0; c
< ZIO_CHILD_TYPES
; c
++)
2330 pio
->io_child_error
[c
] = 0;
2332 if (IO_IS_ALLOCATING(pio
))
2333 BP_ZERO(pio
->io_bp
);
2336 * As we reexecute pio's children, new children could be created.
2337 * New children go to the head of pio's io_child_list, however,
2338 * so we will (correctly) not reexecute them. The key is that
2339 * the remainder of pio's io_child_list, from 'cio_next' onward,
2340 * cannot be affected by any side effects of reexecuting 'cio'.
2342 zio_link_t
*zl
= NULL
;
2343 mutex_enter(&pio
->io_lock
);
2344 for (cio
= zio_walk_children(pio
, &zl
); cio
!= NULL
; cio
= cio_next
) {
2345 cio_next
= zio_walk_children(pio
, &zl
);
2346 for (int w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
2347 pio
->io_children
[cio
->io_child_type
][w
]++;
2348 mutex_exit(&pio
->io_lock
);
2350 mutex_enter(&pio
->io_lock
);
2352 mutex_exit(&pio
->io_lock
);
2355 * Now that all children have been reexecuted, execute the parent.
2356 * We don't reexecute "The Godfather" I/O here as it's the
2357 * responsibility of the caller to wait on it.
2359 if (!(pio
->io_flags
& ZIO_FLAG_GODFATHER
)) {
2360 pio
->io_queued_timestamp
= gethrtime();
2366 zio_suspend(spa_t
*spa
, zio_t
*zio
, zio_suspend_reason_t reason
)
2368 if (spa_get_failmode(spa
) == ZIO_FAILURE_MODE_PANIC
)
2369 fm_panic("Pool '%s' has encountered an uncorrectable I/O "
2370 "failure and the failure mode property for this pool "
2371 "is set to panic.", spa_name(spa
));
2373 cmn_err(CE_WARN
, "Pool '%s' has encountered an uncorrectable I/O "
2374 "failure and has been suspended.\n", spa_name(spa
));
2376 (void) zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE
, spa
, NULL
,
2379 mutex_enter(&spa
->spa_suspend_lock
);
2381 if (spa
->spa_suspend_zio_root
== NULL
)
2382 spa
->spa_suspend_zio_root
= zio_root(spa
, NULL
, NULL
,
2383 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
|
2384 ZIO_FLAG_GODFATHER
);
2386 spa
->spa_suspended
= reason
;
2389 ASSERT(!(zio
->io_flags
& ZIO_FLAG_GODFATHER
));
2390 ASSERT(zio
!= spa
->spa_suspend_zio_root
);
2391 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
2392 ASSERT(zio_unique_parent(zio
) == NULL
);
2393 ASSERT(zio
->io_stage
== ZIO_STAGE_DONE
);
2394 zio_add_child(spa
->spa_suspend_zio_root
, zio
);
2397 mutex_exit(&spa
->spa_suspend_lock
);
2401 zio_resume(spa_t
*spa
)
2406 * Reexecute all previously suspended i/o.
2408 mutex_enter(&spa
->spa_suspend_lock
);
2409 spa
->spa_suspended
= ZIO_SUSPEND_NONE
;
2410 cv_broadcast(&spa
->spa_suspend_cv
);
2411 pio
= spa
->spa_suspend_zio_root
;
2412 spa
->spa_suspend_zio_root
= NULL
;
2413 mutex_exit(&spa
->spa_suspend_lock
);
2419 return (zio_wait(pio
));
2423 zio_resume_wait(spa_t
*spa
)
2425 mutex_enter(&spa
->spa_suspend_lock
);
2426 while (spa_suspended(spa
))
2427 cv_wait(&spa
->spa_suspend_cv
, &spa
->spa_suspend_lock
);
2428 mutex_exit(&spa
->spa_suspend_lock
);
2432 * ==========================================================================
2435 * A gang block is a collection of small blocks that looks to the DMU
2436 * like one large block. When zio_dva_allocate() cannot find a block
2437 * of the requested size, due to either severe fragmentation or the pool
2438 * being nearly full, it calls zio_write_gang_block() to construct the
2439 * block from smaller fragments.
2441 * A gang block consists of a gang header (zio_gbh_phys_t) and up to
2442 * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like
2443 * an indirect block: it's an array of block pointers. It consumes
2444 * only one sector and hence is allocatable regardless of fragmentation.
2445 * The gang header's bps point to its gang members, which hold the data.
2447 * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg>
2448 * as the verifier to ensure uniqueness of the SHA256 checksum.
2449 * Critically, the gang block bp's blk_cksum is the checksum of the data,
2450 * not the gang header. This ensures that data block signatures (needed for
2451 * deduplication) are independent of how the block is physically stored.
2453 * Gang blocks can be nested: a gang member may itself be a gang block.
2454 * Thus every gang block is a tree in which root and all interior nodes are
2455 * gang headers, and the leaves are normal blocks that contain user data.
2456 * The root of the gang tree is called the gang leader.
2458 * To perform any operation (read, rewrite, free, claim) on a gang block,
2459 * zio_gang_assemble() first assembles the gang tree (minus data leaves)
2460 * in the io_gang_tree field of the original logical i/o by recursively
2461 * reading the gang leader and all gang headers below it. This yields
2462 * an in-core tree containing the contents of every gang header and the
2463 * bps for every constituent of the gang block.
2465 * With the gang tree now assembled, zio_gang_issue() just walks the gang tree
2466 * and invokes a callback on each bp. To free a gang block, zio_gang_issue()
2467 * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp.
2468 * zio_claim_gang() provides a similarly trivial wrapper for zio_claim().
2469 * zio_read_gang() is a wrapper around zio_read() that omits reading gang
2470 * headers, since we already have those in io_gang_tree. zio_rewrite_gang()
2471 * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite()
2472 * of the gang header plus zio_checksum_compute() of the data to update the
2473 * gang header's blk_cksum as described above.
2475 * The two-phase assemble/issue model solves the problem of partial failure --
2476 * what if you'd freed part of a gang block but then couldn't read the
2477 * gang header for another part? Assembling the entire gang tree first
2478 * ensures that all the necessary gang header I/O has succeeded before
2479 * starting the actual work of free, claim, or write. Once the gang tree
2480 * is assembled, free and claim are in-memory operations that cannot fail.
2482 * In the event that a gang write fails, zio_dva_unallocate() walks the
2483 * gang tree to immediately free (i.e. insert back into the space map)
2484 * everything we've allocated. This ensures that we don't get ENOSPC
2485 * errors during repeated suspend/resume cycles due to a flaky device.
2487 * Gang rewrites only happen during sync-to-convergence. If we can't assemble
2488 * the gang tree, we won't modify the block, so we can safely defer the free
2489 * (knowing that the block is still intact). If we *can* assemble the gang
2490 * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free
2491 * each constituent bp and we can allocate a new block on the next sync pass.
2493 * In all cases, the gang tree allows complete recovery from partial failure.
2494 * ==========================================================================
2498 zio_gang_issue_func_done(zio_t
*zio
)
2500 abd_free(zio
->io_abd
);
2504 zio_read_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, abd_t
*data
,
2510 return (zio_read(pio
, pio
->io_spa
, bp
, abd_get_offset(data
, offset
),
2511 BP_GET_PSIZE(bp
), zio_gang_issue_func_done
,
2512 NULL
, pio
->io_priority
, ZIO_GANG_CHILD_FLAGS(pio
),
2513 &pio
->io_bookmark
));
2517 zio_rewrite_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, abd_t
*data
,
2524 abd_get_from_buf(gn
->gn_gbh
, SPA_GANGBLOCKSIZE
);
2525 zio
= zio_rewrite(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
2526 gbh_abd
, SPA_GANGBLOCKSIZE
, zio_gang_issue_func_done
, NULL
,
2527 pio
->io_priority
, ZIO_GANG_CHILD_FLAGS(pio
),
2530 * As we rewrite each gang header, the pipeline will compute
2531 * a new gang block header checksum for it; but no one will
2532 * compute a new data checksum, so we do that here. The one
2533 * exception is the gang leader: the pipeline already computed
2534 * its data checksum because that stage precedes gang assembly.
2535 * (Presently, nothing actually uses interior data checksums;
2536 * this is just good hygiene.)
2538 if (gn
!= pio
->io_gang_leader
->io_gang_tree
) {
2539 abd_t
*buf
= abd_get_offset(data
, offset
);
2541 zio_checksum_compute(zio
, BP_GET_CHECKSUM(bp
),
2542 buf
, BP_GET_PSIZE(bp
));
2547 * If we are here to damage data for testing purposes,
2548 * leave the GBH alone so that we can detect the damage.
2550 if (pio
->io_gang_leader
->io_flags
& ZIO_FLAG_INDUCE_DAMAGE
)
2551 zio
->io_pipeline
&= ~ZIO_VDEV_IO_STAGES
;
2553 zio
= zio_rewrite(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
2554 abd_get_offset(data
, offset
), BP_GET_PSIZE(bp
),
2555 zio_gang_issue_func_done
, NULL
, pio
->io_priority
,
2556 ZIO_GANG_CHILD_FLAGS(pio
), &pio
->io_bookmark
);
2563 zio_free_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, abd_t
*data
,
2566 (void) gn
, (void) data
, (void) offset
;
2568 zio_t
*zio
= zio_free_sync(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
2569 ZIO_GANG_CHILD_FLAGS(pio
));
2571 zio
= zio_null(pio
, pio
->io_spa
,
2572 NULL
, NULL
, NULL
, ZIO_GANG_CHILD_FLAGS(pio
));
2578 zio_claim_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, abd_t
*data
,
2581 (void) gn
, (void) data
, (void) offset
;
2582 return (zio_claim(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
2583 NULL
, NULL
, ZIO_GANG_CHILD_FLAGS(pio
)));
2586 static zio_gang_issue_func_t
*zio_gang_issue_func
[ZIO_TYPES
] = {
2595 static void zio_gang_tree_assemble_done(zio_t
*zio
);
2597 static zio_gang_node_t
*
2598 zio_gang_node_alloc(zio_gang_node_t
**gnpp
)
2600 zio_gang_node_t
*gn
;
2602 ASSERT(*gnpp
== NULL
);
2604 gn
= kmem_zalloc(sizeof (*gn
), KM_SLEEP
);
2605 gn
->gn_gbh
= zio_buf_alloc(SPA_GANGBLOCKSIZE
);
2612 zio_gang_node_free(zio_gang_node_t
**gnpp
)
2614 zio_gang_node_t
*gn
= *gnpp
;
2616 for (int g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++)
2617 ASSERT(gn
->gn_child
[g
] == NULL
);
2619 zio_buf_free(gn
->gn_gbh
, SPA_GANGBLOCKSIZE
);
2620 kmem_free(gn
, sizeof (*gn
));
2625 zio_gang_tree_free(zio_gang_node_t
**gnpp
)
2627 zio_gang_node_t
*gn
= *gnpp
;
2632 for (int g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++)
2633 zio_gang_tree_free(&gn
->gn_child
[g
]);
2635 zio_gang_node_free(gnpp
);
2639 zio_gang_tree_assemble(zio_t
*gio
, blkptr_t
*bp
, zio_gang_node_t
**gnpp
)
2641 zio_gang_node_t
*gn
= zio_gang_node_alloc(gnpp
);
2642 abd_t
*gbh_abd
= abd_get_from_buf(gn
->gn_gbh
, SPA_GANGBLOCKSIZE
);
2644 ASSERT(gio
->io_gang_leader
== gio
);
2645 ASSERT(BP_IS_GANG(bp
));
2647 zio_nowait(zio_read(gio
, gio
->io_spa
, bp
, gbh_abd
, SPA_GANGBLOCKSIZE
,
2648 zio_gang_tree_assemble_done
, gn
, gio
->io_priority
,
2649 ZIO_GANG_CHILD_FLAGS(gio
), &gio
->io_bookmark
));
2653 zio_gang_tree_assemble_done(zio_t
*zio
)
2655 zio_t
*gio
= zio
->io_gang_leader
;
2656 zio_gang_node_t
*gn
= zio
->io_private
;
2657 blkptr_t
*bp
= zio
->io_bp
;
2659 ASSERT(gio
== zio_unique_parent(zio
));
2660 ASSERT(zio
->io_child_count
== 0);
2665 /* this ABD was created from a linear buf in zio_gang_tree_assemble */
2666 if (BP_SHOULD_BYTESWAP(bp
))
2667 byteswap_uint64_array(abd_to_buf(zio
->io_abd
), zio
->io_size
);
2669 ASSERT3P(abd_to_buf(zio
->io_abd
), ==, gn
->gn_gbh
);
2670 ASSERT(zio
->io_size
== SPA_GANGBLOCKSIZE
);
2671 ASSERT(gn
->gn_gbh
->zg_tail
.zec_magic
== ZEC_MAGIC
);
2673 abd_free(zio
->io_abd
);
2675 for (int g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++) {
2676 blkptr_t
*gbp
= &gn
->gn_gbh
->zg_blkptr
[g
];
2677 if (!BP_IS_GANG(gbp
))
2679 zio_gang_tree_assemble(gio
, gbp
, &gn
->gn_child
[g
]);
2684 zio_gang_tree_issue(zio_t
*pio
, zio_gang_node_t
*gn
, blkptr_t
*bp
, abd_t
*data
,
2687 zio_t
*gio
= pio
->io_gang_leader
;
2690 ASSERT(BP_IS_GANG(bp
) == !!gn
);
2691 ASSERT(BP_GET_CHECKSUM(bp
) == BP_GET_CHECKSUM(gio
->io_bp
));
2692 ASSERT(BP_GET_LSIZE(bp
) == BP_GET_PSIZE(bp
) || gn
== gio
->io_gang_tree
);
2695 * If you're a gang header, your data is in gn->gn_gbh.
2696 * If you're a gang member, your data is in 'data' and gn == NULL.
2698 zio
= zio_gang_issue_func
[gio
->io_type
](pio
, bp
, gn
, data
, offset
);
2701 ASSERT(gn
->gn_gbh
->zg_tail
.zec_magic
== ZEC_MAGIC
);
2703 for (int g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++) {
2704 blkptr_t
*gbp
= &gn
->gn_gbh
->zg_blkptr
[g
];
2705 if (BP_IS_HOLE(gbp
))
2707 zio_gang_tree_issue(zio
, gn
->gn_child
[g
], gbp
, data
,
2709 offset
+= BP_GET_PSIZE(gbp
);
2713 if (gn
== gio
->io_gang_tree
)
2714 ASSERT3U(gio
->io_size
, ==, offset
);
2721 zio_gang_assemble(zio_t
*zio
)
2723 blkptr_t
*bp
= zio
->io_bp
;
2725 ASSERT(BP_IS_GANG(bp
) && zio
->io_gang_leader
== NULL
);
2726 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
2728 zio
->io_gang_leader
= zio
;
2730 zio_gang_tree_assemble(zio
, bp
, &zio
->io_gang_tree
);
2736 zio_gang_issue(zio_t
*zio
)
2738 blkptr_t
*bp
= zio
->io_bp
;
2740 if (zio_wait_for_children(zio
, ZIO_CHILD_GANG_BIT
, ZIO_WAIT_DONE
)) {
2744 ASSERT(BP_IS_GANG(bp
) && zio
->io_gang_leader
== zio
);
2745 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
2747 if (zio
->io_child_error
[ZIO_CHILD_GANG
] == 0)
2748 zio_gang_tree_issue(zio
, zio
->io_gang_tree
, bp
, zio
->io_abd
,
2751 zio_gang_tree_free(&zio
->io_gang_tree
);
2753 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
2759 zio_write_gang_member_ready(zio_t
*zio
)
2761 zio_t
*pio
= zio_unique_parent(zio
);
2762 dva_t
*cdva
= zio
->io_bp
->blk_dva
;
2763 dva_t
*pdva
= pio
->io_bp
->blk_dva
;
2765 zio_t
*gio __maybe_unused
= zio
->io_gang_leader
;
2767 if (BP_IS_HOLE(zio
->io_bp
))
2770 ASSERT(BP_IS_HOLE(&zio
->io_bp_orig
));
2772 ASSERT(zio
->io_child_type
== ZIO_CHILD_GANG
);
2773 ASSERT3U(zio
->io_prop
.zp_copies
, ==, gio
->io_prop
.zp_copies
);
2774 ASSERT3U(zio
->io_prop
.zp_copies
, <=, BP_GET_NDVAS(zio
->io_bp
));
2775 ASSERT3U(pio
->io_prop
.zp_copies
, <=, BP_GET_NDVAS(pio
->io_bp
));
2776 ASSERT3U(BP_GET_NDVAS(zio
->io_bp
), <=, BP_GET_NDVAS(pio
->io_bp
));
2778 mutex_enter(&pio
->io_lock
);
2779 for (int d
= 0; d
< BP_GET_NDVAS(zio
->io_bp
); d
++) {
2780 ASSERT(DVA_GET_GANG(&pdva
[d
]));
2781 asize
= DVA_GET_ASIZE(&pdva
[d
]);
2782 asize
+= DVA_GET_ASIZE(&cdva
[d
]);
2783 DVA_SET_ASIZE(&pdva
[d
], asize
);
2785 mutex_exit(&pio
->io_lock
);
2789 zio_write_gang_done(zio_t
*zio
)
2792 * The io_abd field will be NULL for a zio with no data. The io_flags
2793 * will initially have the ZIO_FLAG_NODATA bit flag set, but we can't
2794 * check for it here as it is cleared in zio_ready.
2796 if (zio
->io_abd
!= NULL
)
2797 abd_free(zio
->io_abd
);
2801 zio_write_gang_block(zio_t
*pio
, metaslab_class_t
*mc
)
2803 spa_t
*spa
= pio
->io_spa
;
2804 blkptr_t
*bp
= pio
->io_bp
;
2805 zio_t
*gio
= pio
->io_gang_leader
;
2807 zio_gang_node_t
*gn
, **gnpp
;
2808 zio_gbh_phys_t
*gbh
;
2810 uint64_t txg
= pio
->io_txg
;
2811 uint64_t resid
= pio
->io_size
;
2813 int copies
= gio
->io_prop
.zp_copies
;
2817 boolean_t has_data
= !(pio
->io_flags
& ZIO_FLAG_NODATA
);
2820 * encrypted blocks need DVA[2] free so encrypted gang headers can't
2821 * have a third copy.
2823 gbh_copies
= MIN(copies
+ 1, spa_max_replication(spa
));
2824 if (gio
->io_prop
.zp_encrypt
&& gbh_copies
>= SPA_DVAS_PER_BP
)
2825 gbh_copies
= SPA_DVAS_PER_BP
- 1;
2827 int flags
= METASLAB_HINTBP_FAVOR
| METASLAB_GANG_HEADER
;
2828 if (pio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
) {
2829 ASSERT(pio
->io_priority
== ZIO_PRIORITY_ASYNC_WRITE
);
2832 flags
|= METASLAB_ASYNC_ALLOC
;
2833 VERIFY(zfs_refcount_held(&mc
->mc_allocator
[pio
->io_allocator
].
2834 mca_alloc_slots
, pio
));
2837 * The logical zio has already placed a reservation for
2838 * 'copies' allocation slots but gang blocks may require
2839 * additional copies. These additional copies
2840 * (i.e. gbh_copies - copies) are guaranteed to succeed
2841 * since metaslab_class_throttle_reserve() always allows
2842 * additional reservations for gang blocks.
2844 VERIFY(metaslab_class_throttle_reserve(mc
, gbh_copies
- copies
,
2845 pio
->io_allocator
, pio
, flags
));
2848 error
= metaslab_alloc(spa
, mc
, SPA_GANGBLOCKSIZE
,
2849 bp
, gbh_copies
, txg
, pio
== gio
? NULL
: gio
->io_bp
, flags
,
2850 &pio
->io_alloc_list
, pio
, pio
->io_allocator
);
2852 if (pio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
) {
2853 ASSERT(pio
->io_priority
== ZIO_PRIORITY_ASYNC_WRITE
);
2857 * If we failed to allocate the gang block header then
2858 * we remove any additional allocation reservations that
2859 * we placed here. The original reservation will
2860 * be removed when the logical I/O goes to the ready
2863 metaslab_class_throttle_unreserve(mc
,
2864 gbh_copies
- copies
, pio
->io_allocator
, pio
);
2867 pio
->io_error
= error
;
2872 gnpp
= &gio
->io_gang_tree
;
2874 gnpp
= pio
->io_private
;
2875 ASSERT(pio
->io_ready
== zio_write_gang_member_ready
);
2878 gn
= zio_gang_node_alloc(gnpp
);
2880 bzero(gbh
, SPA_GANGBLOCKSIZE
);
2881 gbh_abd
= abd_get_from_buf(gbh
, SPA_GANGBLOCKSIZE
);
2884 * Create the gang header.
2886 zio
= zio_rewrite(pio
, spa
, txg
, bp
, gbh_abd
, SPA_GANGBLOCKSIZE
,
2887 zio_write_gang_done
, NULL
, pio
->io_priority
,
2888 ZIO_GANG_CHILD_FLAGS(pio
), &pio
->io_bookmark
);
2891 * Create and nowait the gang children.
2893 for (int g
= 0; resid
!= 0; resid
-= lsize
, g
++) {
2894 lsize
= P2ROUNDUP(resid
/ (SPA_GBH_NBLKPTRS
- g
),
2896 ASSERT(lsize
>= SPA_MINBLOCKSIZE
&& lsize
<= resid
);
2898 zp
.zp_checksum
= gio
->io_prop
.zp_checksum
;
2899 zp
.zp_compress
= ZIO_COMPRESS_OFF
;
2900 zp
.zp_complevel
= gio
->io_prop
.zp_complevel
;
2901 zp
.zp_type
= DMU_OT_NONE
;
2903 zp
.zp_copies
= gio
->io_prop
.zp_copies
;
2904 zp
.zp_dedup
= B_FALSE
;
2905 zp
.zp_dedup_verify
= B_FALSE
;
2906 zp
.zp_nopwrite
= B_FALSE
;
2907 zp
.zp_encrypt
= gio
->io_prop
.zp_encrypt
;
2908 zp
.zp_byteorder
= gio
->io_prop
.zp_byteorder
;
2909 bzero(zp
.zp_salt
, ZIO_DATA_SALT_LEN
);
2910 bzero(zp
.zp_iv
, ZIO_DATA_IV_LEN
);
2911 bzero(zp
.zp_mac
, ZIO_DATA_MAC_LEN
);
2913 zio_t
*cio
= zio_write(zio
, spa
, txg
, &gbh
->zg_blkptr
[g
],
2914 has_data
? abd_get_offset(pio
->io_abd
, pio
->io_size
-
2915 resid
) : NULL
, lsize
, lsize
, &zp
,
2916 zio_write_gang_member_ready
, NULL
, NULL
,
2917 zio_write_gang_done
, &gn
->gn_child
[g
], pio
->io_priority
,
2918 ZIO_GANG_CHILD_FLAGS(pio
), &pio
->io_bookmark
);
2920 if (pio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
) {
2921 ASSERT(pio
->io_priority
== ZIO_PRIORITY_ASYNC_WRITE
);
2925 * Gang children won't throttle but we should
2926 * account for their work, so reserve an allocation
2927 * slot for them here.
2929 VERIFY(metaslab_class_throttle_reserve(mc
,
2930 zp
.zp_copies
, cio
->io_allocator
, cio
, flags
));
2936 * Set pio's pipeline to just wait for zio to finish.
2938 pio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
2941 * We didn't allocate this bp, so make sure it doesn't get unmarked.
2943 pio
->io_flags
&= ~ZIO_FLAG_FASTWRITE
;
2951 * The zio_nop_write stage in the pipeline determines if allocating a
2952 * new bp is necessary. The nopwrite feature can handle writes in
2953 * either syncing or open context (i.e. zil writes) and as a result is
2954 * mutually exclusive with dedup.
2956 * By leveraging a cryptographically secure checksum, such as SHA256, we
2957 * can compare the checksums of the new data and the old to determine if
2958 * allocating a new block is required. Note that our requirements for
2959 * cryptographic strength are fairly weak: there can't be any accidental
2960 * hash collisions, but we don't need to be secure against intentional
2961 * (malicious) collisions. To trigger a nopwrite, you have to be able
2962 * to write the file to begin with, and triggering an incorrect (hash
2963 * collision) nopwrite is no worse than simply writing to the file.
2964 * That said, there are no known attacks against the checksum algorithms
2965 * used for nopwrite, assuming that the salt and the checksums
2966 * themselves remain secret.
2969 zio_nop_write(zio_t
*zio
)
2971 blkptr_t
*bp
= zio
->io_bp
;
2972 blkptr_t
*bp_orig
= &zio
->io_bp_orig
;
2973 zio_prop_t
*zp
= &zio
->io_prop
;
2975 ASSERT(BP_GET_LEVEL(bp
) == 0);
2976 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_REWRITE
));
2977 ASSERT(zp
->zp_nopwrite
);
2978 ASSERT(!zp
->zp_dedup
);
2979 ASSERT(zio
->io_bp_override
== NULL
);
2980 ASSERT(IO_IS_ALLOCATING(zio
));
2983 * Check to see if the original bp and the new bp have matching
2984 * characteristics (i.e. same checksum, compression algorithms, etc).
2985 * If they don't then just continue with the pipeline which will
2986 * allocate a new bp.
2988 if (BP_IS_HOLE(bp_orig
) ||
2989 !(zio_checksum_table
[BP_GET_CHECKSUM(bp
)].ci_flags
&
2990 ZCHECKSUM_FLAG_NOPWRITE
) ||
2991 BP_IS_ENCRYPTED(bp
) || BP_IS_ENCRYPTED(bp_orig
) ||
2992 BP_GET_CHECKSUM(bp
) != BP_GET_CHECKSUM(bp_orig
) ||
2993 BP_GET_COMPRESS(bp
) != BP_GET_COMPRESS(bp_orig
) ||
2994 BP_GET_DEDUP(bp
) != BP_GET_DEDUP(bp_orig
) ||
2995 zp
->zp_copies
!= BP_GET_NDVAS(bp_orig
))
2999 * If the checksums match then reset the pipeline so that we
3000 * avoid allocating a new bp and issuing any I/O.
3002 if (ZIO_CHECKSUM_EQUAL(bp
->blk_cksum
, bp_orig
->blk_cksum
)) {
3003 ASSERT(zio_checksum_table
[zp
->zp_checksum
].ci_flags
&
3004 ZCHECKSUM_FLAG_NOPWRITE
);
3005 ASSERT3U(BP_GET_PSIZE(bp
), ==, BP_GET_PSIZE(bp_orig
));
3006 ASSERT3U(BP_GET_LSIZE(bp
), ==, BP_GET_LSIZE(bp_orig
));
3007 ASSERT(zp
->zp_compress
!= ZIO_COMPRESS_OFF
);
3008 ASSERT(bcmp(&bp
->blk_prop
, &bp_orig
->blk_prop
,
3009 sizeof (uint64_t)) == 0);
3012 * If we're overwriting a block that is currently on an
3013 * indirect vdev, then ignore the nopwrite request and
3014 * allow a new block to be allocated on a concrete vdev.
3016 spa_config_enter(zio
->io_spa
, SCL_VDEV
, FTAG
, RW_READER
);
3017 vdev_t
*tvd
= vdev_lookup_top(zio
->io_spa
,
3018 DVA_GET_VDEV(&bp
->blk_dva
[0]));
3019 if (tvd
->vdev_ops
== &vdev_indirect_ops
) {
3020 spa_config_exit(zio
->io_spa
, SCL_VDEV
, FTAG
);
3023 spa_config_exit(zio
->io_spa
, SCL_VDEV
, FTAG
);
3026 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
3027 zio
->io_flags
|= ZIO_FLAG_NOPWRITE
;
3034 * ==========================================================================
3036 * ==========================================================================
3039 zio_ddt_child_read_done(zio_t
*zio
)
3041 blkptr_t
*bp
= zio
->io_bp
;
3042 ddt_entry_t
*dde
= zio
->io_private
;
3044 zio_t
*pio
= zio_unique_parent(zio
);
3046 mutex_enter(&pio
->io_lock
);
3047 ddp
= ddt_phys_select(dde
, bp
);
3048 if (zio
->io_error
== 0)
3049 ddt_phys_clear(ddp
); /* this ddp doesn't need repair */
3051 if (zio
->io_error
== 0 && dde
->dde_repair_abd
== NULL
)
3052 dde
->dde_repair_abd
= zio
->io_abd
;
3054 abd_free(zio
->io_abd
);
3055 mutex_exit(&pio
->io_lock
);
3059 zio_ddt_read_start(zio_t
*zio
)
3061 blkptr_t
*bp
= zio
->io_bp
;
3063 ASSERT(BP_GET_DEDUP(bp
));
3064 ASSERT(BP_GET_PSIZE(bp
) == zio
->io_size
);
3065 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
3067 if (zio
->io_child_error
[ZIO_CHILD_DDT
]) {
3068 ddt_t
*ddt
= ddt_select(zio
->io_spa
, bp
);
3069 ddt_entry_t
*dde
= ddt_repair_start(ddt
, bp
);
3070 ddt_phys_t
*ddp
= dde
->dde_phys
;
3071 ddt_phys_t
*ddp_self
= ddt_phys_select(dde
, bp
);
3074 ASSERT(zio
->io_vsd
== NULL
);
3077 if (ddp_self
== NULL
)
3080 for (int p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
3081 if (ddp
->ddp_phys_birth
== 0 || ddp
== ddp_self
)
3083 ddt_bp_create(ddt
->ddt_checksum
, &dde
->dde_key
, ddp
,
3085 zio_nowait(zio_read(zio
, zio
->io_spa
, &blk
,
3086 abd_alloc_for_io(zio
->io_size
, B_TRUE
),
3087 zio
->io_size
, zio_ddt_child_read_done
, dde
,
3088 zio
->io_priority
, ZIO_DDT_CHILD_FLAGS(zio
) |
3089 ZIO_FLAG_DONT_PROPAGATE
, &zio
->io_bookmark
));
3094 zio_nowait(zio_read(zio
, zio
->io_spa
, bp
,
3095 zio
->io_abd
, zio
->io_size
, NULL
, NULL
, zio
->io_priority
,
3096 ZIO_DDT_CHILD_FLAGS(zio
), &zio
->io_bookmark
));
3102 zio_ddt_read_done(zio_t
*zio
)
3104 blkptr_t
*bp
= zio
->io_bp
;
3106 if (zio_wait_for_children(zio
, ZIO_CHILD_DDT_BIT
, ZIO_WAIT_DONE
)) {
3110 ASSERT(BP_GET_DEDUP(bp
));
3111 ASSERT(BP_GET_PSIZE(bp
) == zio
->io_size
);
3112 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
3114 if (zio
->io_child_error
[ZIO_CHILD_DDT
]) {
3115 ddt_t
*ddt
= ddt_select(zio
->io_spa
, bp
);
3116 ddt_entry_t
*dde
= zio
->io_vsd
;
3118 ASSERT(spa_load_state(zio
->io_spa
) != SPA_LOAD_NONE
);
3122 zio
->io_stage
= ZIO_STAGE_DDT_READ_START
>> 1;
3123 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, B_FALSE
);
3126 if (dde
->dde_repair_abd
!= NULL
) {
3127 abd_copy(zio
->io_abd
, dde
->dde_repair_abd
,
3129 zio
->io_child_error
[ZIO_CHILD_DDT
] = 0;
3131 ddt_repair_done(ddt
, dde
);
3135 ASSERT(zio
->io_vsd
== NULL
);
3141 zio_ddt_collision(zio_t
*zio
, ddt_t
*ddt
, ddt_entry_t
*dde
)
3143 spa_t
*spa
= zio
->io_spa
;
3144 boolean_t do_raw
= !!(zio
->io_flags
& ZIO_FLAG_RAW
);
3146 ASSERT(!(zio
->io_bp_override
&& do_raw
));
3149 * Note: we compare the original data, not the transformed data,
3150 * because when zio->io_bp is an override bp, we will not have
3151 * pushed the I/O transforms. That's an important optimization
3152 * because otherwise we'd compress/encrypt all dmu_sync() data twice.
3153 * However, we should never get a raw, override zio so in these
3154 * cases we can compare the io_abd directly. This is useful because
3155 * it allows us to do dedup verification even if we don't have access
3156 * to the original data (for instance, if the encryption keys aren't
3160 for (int p
= DDT_PHYS_SINGLE
; p
<= DDT_PHYS_TRIPLE
; p
++) {
3161 zio_t
*lio
= dde
->dde_lead_zio
[p
];
3163 if (lio
!= NULL
&& do_raw
) {
3164 return (lio
->io_size
!= zio
->io_size
||
3165 abd_cmp(zio
->io_abd
, lio
->io_abd
) != 0);
3166 } else if (lio
!= NULL
) {
3167 return (lio
->io_orig_size
!= zio
->io_orig_size
||
3168 abd_cmp(zio
->io_orig_abd
, lio
->io_orig_abd
) != 0);
3172 for (int p
= DDT_PHYS_SINGLE
; p
<= DDT_PHYS_TRIPLE
; p
++) {
3173 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
3175 if (ddp
->ddp_phys_birth
!= 0 && do_raw
) {
3176 blkptr_t blk
= *zio
->io_bp
;
3181 ddt_bp_fill(ddp
, &blk
, ddp
->ddp_phys_birth
);
3182 psize
= BP_GET_PSIZE(&blk
);
3184 if (psize
!= zio
->io_size
)
3189 tmpabd
= abd_alloc_for_io(psize
, B_TRUE
);
3191 error
= zio_wait(zio_read(NULL
, spa
, &blk
, tmpabd
,
3192 psize
, NULL
, NULL
, ZIO_PRIORITY_SYNC_READ
,
3193 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
|
3194 ZIO_FLAG_RAW
, &zio
->io_bookmark
));
3197 if (abd_cmp(tmpabd
, zio
->io_abd
) != 0)
3198 error
= SET_ERROR(ENOENT
);
3203 return (error
!= 0);
3204 } else if (ddp
->ddp_phys_birth
!= 0) {
3205 arc_buf_t
*abuf
= NULL
;
3206 arc_flags_t aflags
= ARC_FLAG_WAIT
;
3207 blkptr_t blk
= *zio
->io_bp
;
3210 ddt_bp_fill(ddp
, &blk
, ddp
->ddp_phys_birth
);
3212 if (BP_GET_LSIZE(&blk
) != zio
->io_orig_size
)
3217 error
= arc_read(NULL
, spa
, &blk
,
3218 arc_getbuf_func
, &abuf
, ZIO_PRIORITY_SYNC_READ
,
3219 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
,
3220 &aflags
, &zio
->io_bookmark
);
3223 if (abd_cmp_buf(zio
->io_orig_abd
, abuf
->b_data
,
3224 zio
->io_orig_size
) != 0)
3225 error
= SET_ERROR(ENOENT
);
3226 arc_buf_destroy(abuf
, &abuf
);
3230 return (error
!= 0);
3238 zio_ddt_child_write_ready(zio_t
*zio
)
3240 int p
= zio
->io_prop
.zp_copies
;
3241 ddt_t
*ddt
= ddt_select(zio
->io_spa
, zio
->io_bp
);
3242 ddt_entry_t
*dde
= zio
->io_private
;
3243 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
3251 ASSERT(dde
->dde_lead_zio
[p
] == zio
);
3253 ddt_phys_fill(ddp
, zio
->io_bp
);
3255 zio_link_t
*zl
= NULL
;
3256 while ((pio
= zio_walk_parents(zio
, &zl
)) != NULL
)
3257 ddt_bp_fill(ddp
, pio
->io_bp
, zio
->io_txg
);
3263 zio_ddt_child_write_done(zio_t
*zio
)
3265 int p
= zio
->io_prop
.zp_copies
;
3266 ddt_t
*ddt
= ddt_select(zio
->io_spa
, zio
->io_bp
);
3267 ddt_entry_t
*dde
= zio
->io_private
;
3268 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
3272 ASSERT(ddp
->ddp_refcnt
== 0);
3273 ASSERT(dde
->dde_lead_zio
[p
] == zio
);
3274 dde
->dde_lead_zio
[p
] = NULL
;
3276 if (zio
->io_error
== 0) {
3277 zio_link_t
*zl
= NULL
;
3278 while (zio_walk_parents(zio
, &zl
) != NULL
)
3279 ddt_phys_addref(ddp
);
3281 ddt_phys_clear(ddp
);
3288 zio_ddt_write(zio_t
*zio
)
3290 spa_t
*spa
= zio
->io_spa
;
3291 blkptr_t
*bp
= zio
->io_bp
;
3292 uint64_t txg
= zio
->io_txg
;
3293 zio_prop_t
*zp
= &zio
->io_prop
;
3294 int p
= zp
->zp_copies
;
3296 ddt_t
*ddt
= ddt_select(spa
, bp
);
3300 ASSERT(BP_GET_DEDUP(bp
));
3301 ASSERT(BP_GET_CHECKSUM(bp
) == zp
->zp_checksum
);
3302 ASSERT(BP_IS_HOLE(bp
) || zio
->io_bp_override
);
3303 ASSERT(!(zio
->io_bp_override
&& (zio
->io_flags
& ZIO_FLAG_RAW
)));
3306 dde
= ddt_lookup(ddt
, bp
, B_TRUE
);
3307 ddp
= &dde
->dde_phys
[p
];
3309 if (zp
->zp_dedup_verify
&& zio_ddt_collision(zio
, ddt
, dde
)) {
3311 * If we're using a weak checksum, upgrade to a strong checksum
3312 * and try again. If we're already using a strong checksum,
3313 * we can't resolve it, so just convert to an ordinary write.
3314 * (And automatically e-mail a paper to Nature?)
3316 if (!(zio_checksum_table
[zp
->zp_checksum
].ci_flags
&
3317 ZCHECKSUM_FLAG_DEDUP
)) {
3318 zp
->zp_checksum
= spa_dedup_checksum(spa
);
3319 zio_pop_transforms(zio
);
3320 zio
->io_stage
= ZIO_STAGE_OPEN
;
3323 zp
->zp_dedup
= B_FALSE
;
3324 BP_SET_DEDUP(bp
, B_FALSE
);
3326 ASSERT(!BP_GET_DEDUP(bp
));
3327 zio
->io_pipeline
= ZIO_WRITE_PIPELINE
;
3332 if (ddp
->ddp_phys_birth
!= 0 || dde
->dde_lead_zio
[p
] != NULL
) {
3333 if (ddp
->ddp_phys_birth
!= 0)
3334 ddt_bp_fill(ddp
, bp
, txg
);
3335 if (dde
->dde_lead_zio
[p
] != NULL
)
3336 zio_add_child(zio
, dde
->dde_lead_zio
[p
]);
3338 ddt_phys_addref(ddp
);
3339 } else if (zio
->io_bp_override
) {
3340 ASSERT(bp
->blk_birth
== txg
);
3341 ASSERT(BP_EQUAL(bp
, zio
->io_bp_override
));
3342 ddt_phys_fill(ddp
, bp
);
3343 ddt_phys_addref(ddp
);
3345 cio
= zio_write(zio
, spa
, txg
, bp
, zio
->io_orig_abd
,
3346 zio
->io_orig_size
, zio
->io_orig_size
, zp
,
3347 zio_ddt_child_write_ready
, NULL
, NULL
,
3348 zio_ddt_child_write_done
, dde
, zio
->io_priority
,
3349 ZIO_DDT_CHILD_FLAGS(zio
), &zio
->io_bookmark
);
3351 zio_push_transform(cio
, zio
->io_abd
, zio
->io_size
, 0, NULL
);
3352 dde
->dde_lead_zio
[p
] = cio
;
3362 ddt_entry_t
*freedde
; /* for debugging */
3365 zio_ddt_free(zio_t
*zio
)
3367 spa_t
*spa
= zio
->io_spa
;
3368 blkptr_t
*bp
= zio
->io_bp
;
3369 ddt_t
*ddt
= ddt_select(spa
, bp
);
3373 ASSERT(BP_GET_DEDUP(bp
));
3374 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
3377 freedde
= dde
= ddt_lookup(ddt
, bp
, B_TRUE
);
3379 ddp
= ddt_phys_select(dde
, bp
);
3381 ddt_phys_decref(ddp
);
3389 * ==========================================================================
3390 * Allocate and free blocks
3391 * ==========================================================================
3395 zio_io_to_allocate(spa_t
*spa
, int allocator
)
3399 ASSERT(MUTEX_HELD(&spa
->spa_allocs
[allocator
].spaa_lock
));
3401 zio
= avl_first(&spa
->spa_allocs
[allocator
].spaa_tree
);
3405 ASSERT(IO_IS_ALLOCATING(zio
));
3408 * Try to place a reservation for this zio. If we're unable to
3409 * reserve then we throttle.
3411 ASSERT3U(zio
->io_allocator
, ==, allocator
);
3412 if (!metaslab_class_throttle_reserve(zio
->io_metaslab_class
,
3413 zio
->io_prop
.zp_copies
, allocator
, zio
, 0)) {
3417 avl_remove(&spa
->spa_allocs
[allocator
].spaa_tree
, zio
);
3418 ASSERT3U(zio
->io_stage
, <, ZIO_STAGE_DVA_ALLOCATE
);
3424 zio_dva_throttle(zio_t
*zio
)
3426 spa_t
*spa
= zio
->io_spa
;
3428 metaslab_class_t
*mc
;
3430 /* locate an appropriate allocation class */
3431 mc
= spa_preferred_class(spa
, zio
->io_size
, zio
->io_prop
.zp_type
,
3432 zio
->io_prop
.zp_level
, zio
->io_prop
.zp_zpl_smallblk
);
3434 if (zio
->io_priority
== ZIO_PRIORITY_SYNC_WRITE
||
3435 !mc
->mc_alloc_throttle_enabled
||
3436 zio
->io_child_type
== ZIO_CHILD_GANG
||
3437 zio
->io_flags
& ZIO_FLAG_NODATA
) {
3441 ASSERT(zio
->io_type
== ZIO_TYPE_WRITE
);
3442 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
3443 ASSERT3U(zio
->io_queued_timestamp
, >, 0);
3444 ASSERT(zio
->io_stage
== ZIO_STAGE_DVA_THROTTLE
);
3446 zbookmark_phys_t
*bm
= &zio
->io_bookmark
;
3448 * We want to try to use as many allocators as possible to help improve
3449 * performance, but we also want logically adjacent IOs to be physically
3450 * adjacent to improve sequential read performance. We chunk each object
3451 * into 2^20 block regions, and then hash based on the objset, object,
3452 * level, and region to accomplish both of these goals.
3454 int allocator
= (uint_t
)cityhash4(bm
->zb_objset
, bm
->zb_object
,
3455 bm
->zb_level
, bm
->zb_blkid
>> 20) % spa
->spa_alloc_count
;
3456 zio
->io_allocator
= allocator
;
3457 zio
->io_metaslab_class
= mc
;
3458 mutex_enter(&spa
->spa_allocs
[allocator
].spaa_lock
);
3459 avl_add(&spa
->spa_allocs
[allocator
].spaa_tree
, zio
);
3460 nio
= zio_io_to_allocate(spa
, allocator
);
3461 mutex_exit(&spa
->spa_allocs
[allocator
].spaa_lock
);
3466 zio_allocate_dispatch(spa_t
*spa
, int allocator
)
3470 mutex_enter(&spa
->spa_allocs
[allocator
].spaa_lock
);
3471 zio
= zio_io_to_allocate(spa
, allocator
);
3472 mutex_exit(&spa
->spa_allocs
[allocator
].spaa_lock
);
3476 ASSERT3U(zio
->io_stage
, ==, ZIO_STAGE_DVA_THROTTLE
);
3477 ASSERT0(zio
->io_error
);
3478 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, B_TRUE
);
3482 zio_dva_allocate(zio_t
*zio
)
3484 spa_t
*spa
= zio
->io_spa
;
3485 metaslab_class_t
*mc
;
3486 blkptr_t
*bp
= zio
->io_bp
;
3490 if (zio
->io_gang_leader
== NULL
) {
3491 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
3492 zio
->io_gang_leader
= zio
;
3495 ASSERT(BP_IS_HOLE(bp
));
3496 ASSERT0(BP_GET_NDVAS(bp
));
3497 ASSERT3U(zio
->io_prop
.zp_copies
, >, 0);
3498 ASSERT3U(zio
->io_prop
.zp_copies
, <=, spa_max_replication(spa
));
3499 ASSERT3U(zio
->io_size
, ==, BP_GET_PSIZE(bp
));
3501 flags
|= (zio
->io_flags
& ZIO_FLAG_FASTWRITE
) ? METASLAB_FASTWRITE
: 0;
3502 if (zio
->io_flags
& ZIO_FLAG_NODATA
)
3503 flags
|= METASLAB_DONT_THROTTLE
;
3504 if (zio
->io_flags
& ZIO_FLAG_GANG_CHILD
)
3505 flags
|= METASLAB_GANG_CHILD
;
3506 if (zio
->io_priority
== ZIO_PRIORITY_ASYNC_WRITE
)
3507 flags
|= METASLAB_ASYNC_ALLOC
;
3510 * if not already chosen, locate an appropriate allocation class
3512 mc
= zio
->io_metaslab_class
;
3514 mc
= spa_preferred_class(spa
, zio
->io_size
,
3515 zio
->io_prop
.zp_type
, zio
->io_prop
.zp_level
,
3516 zio
->io_prop
.zp_zpl_smallblk
);
3517 zio
->io_metaslab_class
= mc
;
3521 * Try allocating the block in the usual metaslab class.
3522 * If that's full, allocate it in the normal class.
3523 * If that's full, allocate as a gang block,
3524 * and if all are full, the allocation fails (which shouldn't happen).
3526 * Note that we do not fall back on embedded slog (ZIL) space, to
3527 * preserve unfragmented slog space, which is critical for decent
3528 * sync write performance. If a log allocation fails, we will fall
3529 * back to spa_sync() which is abysmal for performance.
3531 error
= metaslab_alloc(spa
, mc
, zio
->io_size
, bp
,
3532 zio
->io_prop
.zp_copies
, zio
->io_txg
, NULL
, flags
,
3533 &zio
->io_alloc_list
, zio
, zio
->io_allocator
);
3536 * Fallback to normal class when an alloc class is full
3538 if (error
== ENOSPC
&& mc
!= spa_normal_class(spa
)) {
3540 * If throttling, transfer reservation over to normal class.
3541 * The io_allocator slot can remain the same even though we
3542 * are switching classes.
3544 if (mc
->mc_alloc_throttle_enabled
&&
3545 (zio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
)) {
3546 metaslab_class_throttle_unreserve(mc
,
3547 zio
->io_prop
.zp_copies
, zio
->io_allocator
, zio
);
3548 zio
->io_flags
&= ~ZIO_FLAG_IO_ALLOCATING
;
3550 VERIFY(metaslab_class_throttle_reserve(
3551 spa_normal_class(spa
),
3552 zio
->io_prop
.zp_copies
, zio
->io_allocator
, zio
,
3553 flags
| METASLAB_MUST_RESERVE
));
3555 zio
->io_metaslab_class
= mc
= spa_normal_class(spa
);
3556 if (zfs_flags
& ZFS_DEBUG_METASLAB_ALLOC
) {
3557 zfs_dbgmsg("%s: metaslab allocation failure, "
3558 "trying normal class: zio %px, size %llu, error %d",
3559 spa_name(spa
), zio
, (u_longlong_t
)zio
->io_size
,
3563 error
= metaslab_alloc(spa
, mc
, zio
->io_size
, bp
,
3564 zio
->io_prop
.zp_copies
, zio
->io_txg
, NULL
, flags
,
3565 &zio
->io_alloc_list
, zio
, zio
->io_allocator
);
3568 if (error
== ENOSPC
&& zio
->io_size
> SPA_MINBLOCKSIZE
) {
3569 if (zfs_flags
& ZFS_DEBUG_METASLAB_ALLOC
) {
3570 zfs_dbgmsg("%s: metaslab allocation failure, "
3571 "trying ganging: zio %px, size %llu, error %d",
3572 spa_name(spa
), zio
, (u_longlong_t
)zio
->io_size
,
3575 return (zio_write_gang_block(zio
, mc
));
3578 if (error
!= ENOSPC
||
3579 (zfs_flags
& ZFS_DEBUG_METASLAB_ALLOC
)) {
3580 zfs_dbgmsg("%s: metaslab allocation failure: zio %px, "
3581 "size %llu, error %d",
3582 spa_name(spa
), zio
, (u_longlong_t
)zio
->io_size
,
3585 zio
->io_error
= error
;
3592 zio_dva_free(zio_t
*zio
)
3594 metaslab_free(zio
->io_spa
, zio
->io_bp
, zio
->io_txg
, B_FALSE
);
3600 zio_dva_claim(zio_t
*zio
)
3604 error
= metaslab_claim(zio
->io_spa
, zio
->io_bp
, zio
->io_txg
);
3606 zio
->io_error
= error
;
3612 * Undo an allocation. This is used by zio_done() when an I/O fails
3613 * and we want to give back the block we just allocated.
3614 * This handles both normal blocks and gang blocks.
3617 zio_dva_unallocate(zio_t
*zio
, zio_gang_node_t
*gn
, blkptr_t
*bp
)
3619 ASSERT(bp
->blk_birth
== zio
->io_txg
|| BP_IS_HOLE(bp
));
3620 ASSERT(zio
->io_bp_override
== NULL
);
3622 if (!BP_IS_HOLE(bp
))
3623 metaslab_free(zio
->io_spa
, bp
, bp
->blk_birth
, B_TRUE
);
3626 for (int g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++) {
3627 zio_dva_unallocate(zio
, gn
->gn_child
[g
],
3628 &gn
->gn_gbh
->zg_blkptr
[g
]);
3634 * Try to allocate an intent log block. Return 0 on success, errno on failure.
3637 zio_alloc_zil(spa_t
*spa
, objset_t
*os
, uint64_t txg
, blkptr_t
*new_bp
,
3638 uint64_t size
, boolean_t
*slog
)
3641 zio_alloc_list_t io_alloc_list
;
3643 ASSERT(txg
> spa_syncing_txg(spa
));
3645 metaslab_trace_init(&io_alloc_list
);
3648 * Block pointer fields are useful to metaslabs for stats and debugging.
3649 * Fill in the obvious ones before calling into metaslab_alloc().
3651 BP_SET_TYPE(new_bp
, DMU_OT_INTENT_LOG
);
3652 BP_SET_PSIZE(new_bp
, size
);
3653 BP_SET_LEVEL(new_bp
, 0);
3656 * When allocating a zil block, we don't have information about
3657 * the final destination of the block except the objset it's part
3658 * of, so we just hash the objset ID to pick the allocator to get
3661 int flags
= METASLAB_FASTWRITE
| METASLAB_ZIL
;
3662 int allocator
= (uint_t
)cityhash4(0, 0, 0,
3663 os
->os_dsl_dataset
->ds_object
) % spa
->spa_alloc_count
;
3664 error
= metaslab_alloc(spa
, spa_log_class(spa
), size
, new_bp
, 1,
3665 txg
, NULL
, flags
, &io_alloc_list
, NULL
, allocator
);
3666 *slog
= (error
== 0);
3668 error
= metaslab_alloc(spa
, spa_embedded_log_class(spa
), size
,
3669 new_bp
, 1, txg
, NULL
, flags
,
3670 &io_alloc_list
, NULL
, allocator
);
3673 error
= metaslab_alloc(spa
, spa_normal_class(spa
), size
,
3674 new_bp
, 1, txg
, NULL
, flags
,
3675 &io_alloc_list
, NULL
, allocator
);
3677 metaslab_trace_fini(&io_alloc_list
);
3680 BP_SET_LSIZE(new_bp
, size
);
3681 BP_SET_PSIZE(new_bp
, size
);
3682 BP_SET_COMPRESS(new_bp
, ZIO_COMPRESS_OFF
);
3683 BP_SET_CHECKSUM(new_bp
,
3684 spa_version(spa
) >= SPA_VERSION_SLIM_ZIL
3685 ? ZIO_CHECKSUM_ZILOG2
: ZIO_CHECKSUM_ZILOG
);
3686 BP_SET_TYPE(new_bp
, DMU_OT_INTENT_LOG
);
3687 BP_SET_LEVEL(new_bp
, 0);
3688 BP_SET_DEDUP(new_bp
, 0);
3689 BP_SET_BYTEORDER(new_bp
, ZFS_HOST_BYTEORDER
);
3692 * encrypted blocks will require an IV and salt. We generate
3693 * these now since we will not be rewriting the bp at
3696 if (os
->os_encrypted
) {
3697 uint8_t iv
[ZIO_DATA_IV_LEN
];
3698 uint8_t salt
[ZIO_DATA_SALT_LEN
];
3700 BP_SET_CRYPT(new_bp
, B_TRUE
);
3701 VERIFY0(spa_crypt_get_salt(spa
,
3702 dmu_objset_id(os
), salt
));
3703 VERIFY0(zio_crypt_generate_iv(iv
));
3705 zio_crypt_encode_params_bp(new_bp
, salt
, iv
);
3708 zfs_dbgmsg("%s: zil block allocation failure: "
3709 "size %llu, error %d", spa_name(spa
), (u_longlong_t
)size
,
3717 * ==========================================================================
3718 * Read and write to physical devices
3719 * ==========================================================================
3723 * Issue an I/O to the underlying vdev. Typically the issue pipeline
3724 * stops after this stage and will resume upon I/O completion.
3725 * However, there are instances where the vdev layer may need to
3726 * continue the pipeline when an I/O was not issued. Since the I/O
3727 * that was sent to the vdev layer might be different than the one
3728 * currently active in the pipeline (see vdev_queue_io()), we explicitly
3729 * force the underlying vdev layers to call either zio_execute() or
3730 * zio_interrupt() to ensure that the pipeline continues with the correct I/O.
3733 zio_vdev_io_start(zio_t
*zio
)
3735 vdev_t
*vd
= zio
->io_vd
;
3737 spa_t
*spa
= zio
->io_spa
;
3741 ASSERT(zio
->io_error
== 0);
3742 ASSERT(zio
->io_child_error
[ZIO_CHILD_VDEV
] == 0);
3745 if (!(zio
->io_flags
& ZIO_FLAG_CONFIG_WRITER
))
3746 spa_config_enter(spa
, SCL_ZIO
, zio
, RW_READER
);
3749 * The mirror_ops handle multiple DVAs in a single BP.
3751 vdev_mirror_ops
.vdev_op_io_start(zio
);
3755 ASSERT3P(zio
->io_logical
, !=, zio
);
3756 if (zio
->io_type
== ZIO_TYPE_WRITE
) {
3757 ASSERT(spa
->spa_trust_config
);
3760 * Note: the code can handle other kinds of writes,
3761 * but we don't expect them.
3763 if (zio
->io_vd
->vdev_noalloc
) {
3764 ASSERT(zio
->io_flags
&
3765 (ZIO_FLAG_PHYSICAL
| ZIO_FLAG_SELF_HEAL
|
3766 ZIO_FLAG_RESILVER
| ZIO_FLAG_INDUCE_DAMAGE
));
3770 align
= 1ULL << vd
->vdev_top
->vdev_ashift
;
3772 if (!(zio
->io_flags
& ZIO_FLAG_PHYSICAL
) &&
3773 P2PHASE(zio
->io_size
, align
) != 0) {
3774 /* Transform logical writes to be a full physical block size. */
3775 uint64_t asize
= P2ROUNDUP(zio
->io_size
, align
);
3776 abd_t
*abuf
= abd_alloc_sametype(zio
->io_abd
, asize
);
3777 ASSERT(vd
== vd
->vdev_top
);
3778 if (zio
->io_type
== ZIO_TYPE_WRITE
) {
3779 abd_copy(abuf
, zio
->io_abd
, zio
->io_size
);
3780 abd_zero_off(abuf
, zio
->io_size
, asize
- zio
->io_size
);
3782 zio_push_transform(zio
, abuf
, asize
, asize
, zio_subblock
);
3786 * If this is not a physical io, make sure that it is properly aligned
3787 * before proceeding.
3789 if (!(zio
->io_flags
& ZIO_FLAG_PHYSICAL
)) {
3790 ASSERT0(P2PHASE(zio
->io_offset
, align
));
3791 ASSERT0(P2PHASE(zio
->io_size
, align
));
3794 * For physical writes, we allow 512b aligned writes and assume
3795 * the device will perform a read-modify-write as necessary.
3797 ASSERT0(P2PHASE(zio
->io_offset
, SPA_MINBLOCKSIZE
));
3798 ASSERT0(P2PHASE(zio
->io_size
, SPA_MINBLOCKSIZE
));
3801 VERIFY(zio
->io_type
!= ZIO_TYPE_WRITE
|| spa_writeable(spa
));
3804 * If this is a repair I/O, and there's no self-healing involved --
3805 * that is, we're just resilvering what we expect to resilver --
3806 * then don't do the I/O unless zio's txg is actually in vd's DTL.
3807 * This prevents spurious resilvering.
3809 * There are a few ways that we can end up creating these spurious
3812 * 1. A resilver i/o will be issued if any DVA in the BP has a
3813 * dirty DTL. The mirror code will issue resilver writes to
3814 * each DVA, including the one(s) that are not on vdevs with dirty
3817 * 2. With nested replication, which happens when we have a
3818 * "replacing" or "spare" vdev that's a child of a mirror or raidz.
3819 * For example, given mirror(replacing(A+B), C), it's likely that
3820 * only A is out of date (it's the new device). In this case, we'll
3821 * read from C, then use the data to resilver A+B -- but we don't
3822 * actually want to resilver B, just A. The top-level mirror has no
3823 * way to know this, so instead we just discard unnecessary repairs
3824 * as we work our way down the vdev tree.
3826 * 3. ZTEST also creates mirrors of mirrors, mirrors of raidz, etc.
3827 * The same logic applies to any form of nested replication: ditto
3828 * + mirror, RAID-Z + replacing, etc.
3830 * However, indirect vdevs point off to other vdevs which may have
3831 * DTL's, so we never bypass them. The child i/os on concrete vdevs
3832 * will be properly bypassed instead.
3834 * Leaf DTL_PARTIAL can be empty when a legitimate write comes from
3835 * a dRAID spare vdev. For example, when a dRAID spare is first
3836 * used, its spare blocks need to be written to but the leaf vdev's
3837 * of such blocks can have empty DTL_PARTIAL.
3839 * There seemed no clean way to allow such writes while bypassing
3840 * spurious ones. At this point, just avoid all bypassing for dRAID
3843 if ((zio
->io_flags
& ZIO_FLAG_IO_REPAIR
) &&
3844 !(zio
->io_flags
& ZIO_FLAG_SELF_HEAL
) &&
3845 zio
->io_txg
!= 0 && /* not a delegated i/o */
3846 vd
->vdev_ops
!= &vdev_indirect_ops
&&
3847 vd
->vdev_top
->vdev_ops
!= &vdev_draid_ops
&&
3848 !vdev_dtl_contains(vd
, DTL_PARTIAL
, zio
->io_txg
, 1)) {
3849 ASSERT(zio
->io_type
== ZIO_TYPE_WRITE
);
3850 zio_vdev_io_bypass(zio
);
3855 * Select the next best leaf I/O to process. Distributed spares are
3856 * excluded since they dispatch the I/O directly to a leaf vdev after
3857 * applying the dRAID mapping.
3859 if (vd
->vdev_ops
->vdev_op_leaf
&&
3860 vd
->vdev_ops
!= &vdev_draid_spare_ops
&&
3861 (zio
->io_type
== ZIO_TYPE_READ
||
3862 zio
->io_type
== ZIO_TYPE_WRITE
||
3863 zio
->io_type
== ZIO_TYPE_TRIM
)) {
3865 if (zio
->io_type
== ZIO_TYPE_READ
&& vdev_cache_read(zio
))
3868 if ((zio
= vdev_queue_io(zio
)) == NULL
)
3871 if (!vdev_accessible(vd
, zio
)) {
3872 zio
->io_error
= SET_ERROR(ENXIO
);
3876 zio
->io_delay
= gethrtime();
3879 vd
->vdev_ops
->vdev_op_io_start(zio
);
3884 zio_vdev_io_done(zio_t
*zio
)
3886 vdev_t
*vd
= zio
->io_vd
;
3887 vdev_ops_t
*ops
= vd
? vd
->vdev_ops
: &vdev_mirror_ops
;
3888 boolean_t unexpected_error
= B_FALSE
;
3890 if (zio_wait_for_children(zio
, ZIO_CHILD_VDEV_BIT
, ZIO_WAIT_DONE
)) {
3894 ASSERT(zio
->io_type
== ZIO_TYPE_READ
||
3895 zio
->io_type
== ZIO_TYPE_WRITE
|| zio
->io_type
== ZIO_TYPE_TRIM
);
3898 zio
->io_delay
= gethrtime() - zio
->io_delay
;
3900 if (vd
!= NULL
&& vd
->vdev_ops
->vdev_op_leaf
&&
3901 vd
->vdev_ops
!= &vdev_draid_spare_ops
) {
3902 vdev_queue_io_done(zio
);
3904 if (zio
->io_type
== ZIO_TYPE_WRITE
)
3905 vdev_cache_write(zio
);
3907 if (zio_injection_enabled
&& zio
->io_error
== 0)
3908 zio
->io_error
= zio_handle_device_injections(vd
, zio
,
3911 if (zio_injection_enabled
&& zio
->io_error
== 0)
3912 zio
->io_error
= zio_handle_label_injection(zio
, EIO
);
3914 if (zio
->io_error
&& zio
->io_type
!= ZIO_TYPE_TRIM
) {
3915 if (!vdev_accessible(vd
, zio
)) {
3916 zio
->io_error
= SET_ERROR(ENXIO
);
3918 unexpected_error
= B_TRUE
;
3923 ops
->vdev_op_io_done(zio
);
3925 if (unexpected_error
)
3926 VERIFY(vdev_probe(vd
, zio
) == NULL
);
3932 * This function is used to change the priority of an existing zio that is
3933 * currently in-flight. This is used by the arc to upgrade priority in the
3934 * event that a demand read is made for a block that is currently queued
3935 * as a scrub or async read IO. Otherwise, the high priority read request
3936 * would end up having to wait for the lower priority IO.
3939 zio_change_priority(zio_t
*pio
, zio_priority_t priority
)
3941 zio_t
*cio
, *cio_next
;
3942 zio_link_t
*zl
= NULL
;
3944 ASSERT3U(priority
, <, ZIO_PRIORITY_NUM_QUEUEABLE
);
3946 if (pio
->io_vd
!= NULL
&& pio
->io_vd
->vdev_ops
->vdev_op_leaf
) {
3947 vdev_queue_change_io_priority(pio
, priority
);
3949 pio
->io_priority
= priority
;
3952 mutex_enter(&pio
->io_lock
);
3953 for (cio
= zio_walk_children(pio
, &zl
); cio
!= NULL
; cio
= cio_next
) {
3954 cio_next
= zio_walk_children(pio
, &zl
);
3955 zio_change_priority(cio
, priority
);
3957 mutex_exit(&pio
->io_lock
);
3961 * For non-raidz ZIOs, we can just copy aside the bad data read from the
3962 * disk, and use that to finish the checksum ereport later.
3965 zio_vsd_default_cksum_finish(zio_cksum_report_t
*zcr
,
3966 const abd_t
*good_buf
)
3968 /* no processing needed */
3969 zfs_ereport_finish_checksum(zcr
, good_buf
, zcr
->zcr_cbdata
, B_FALSE
);
3973 zio_vsd_default_cksum_report(zio_t
*zio
, zio_cksum_report_t
*zcr
)
3975 void *abd
= abd_alloc_sametype(zio
->io_abd
, zio
->io_size
);
3977 abd_copy(abd
, zio
->io_abd
, zio
->io_size
);
3979 zcr
->zcr_cbinfo
= zio
->io_size
;
3980 zcr
->zcr_cbdata
= abd
;
3981 zcr
->zcr_finish
= zio_vsd_default_cksum_finish
;
3982 zcr
->zcr_free
= zio_abd_free
;
3986 zio_vdev_io_assess(zio_t
*zio
)
3988 vdev_t
*vd
= zio
->io_vd
;
3990 if (zio_wait_for_children(zio
, ZIO_CHILD_VDEV_BIT
, ZIO_WAIT_DONE
)) {
3994 if (vd
== NULL
&& !(zio
->io_flags
& ZIO_FLAG_CONFIG_WRITER
))
3995 spa_config_exit(zio
->io_spa
, SCL_ZIO
, zio
);
3997 if (zio
->io_vsd
!= NULL
) {
3998 zio
->io_vsd_ops
->vsd_free(zio
);
4002 if (zio_injection_enabled
&& zio
->io_error
== 0)
4003 zio
->io_error
= zio_handle_fault_injection(zio
, EIO
);
4006 * If the I/O failed, determine whether we should attempt to retry it.
4008 * On retry, we cut in line in the issue queue, since we don't want
4009 * compression/checksumming/etc. work to prevent our (cheap) IO reissue.
4011 if (zio
->io_error
&& vd
== NULL
&&
4012 !(zio
->io_flags
& (ZIO_FLAG_DONT_RETRY
| ZIO_FLAG_IO_RETRY
))) {
4013 ASSERT(!(zio
->io_flags
& ZIO_FLAG_DONT_QUEUE
)); /* not a leaf */
4014 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_BYPASS
)); /* not a leaf */
4016 zio
->io_flags
|= ZIO_FLAG_IO_RETRY
|
4017 ZIO_FLAG_DONT_CACHE
| ZIO_FLAG_DONT_AGGREGATE
;
4018 zio
->io_stage
= ZIO_STAGE_VDEV_IO_START
>> 1;
4019 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
,
4020 zio_requeue_io_start_cut_in_line
);
4025 * If we got an error on a leaf device, convert it to ENXIO
4026 * if the device is not accessible at all.
4028 if (zio
->io_error
&& vd
!= NULL
&& vd
->vdev_ops
->vdev_op_leaf
&&
4029 !vdev_accessible(vd
, zio
))
4030 zio
->io_error
= SET_ERROR(ENXIO
);
4033 * If we can't write to an interior vdev (mirror or RAID-Z),
4034 * set vdev_cant_write so that we stop trying to allocate from it.
4036 if (zio
->io_error
== ENXIO
&& zio
->io_type
== ZIO_TYPE_WRITE
&&
4037 vd
!= NULL
&& !vd
->vdev_ops
->vdev_op_leaf
) {
4038 vdev_dbgmsg(vd
, "zio_vdev_io_assess(zio=%px) setting "
4039 "cant_write=TRUE due to write failure with ENXIO",
4041 vd
->vdev_cant_write
= B_TRUE
;
4045 * If a cache flush returns ENOTSUP or ENOTTY, we know that no future
4046 * attempts will ever succeed. In this case we set a persistent
4047 * boolean flag so that we don't bother with it in the future.
4049 if ((zio
->io_error
== ENOTSUP
|| zio
->io_error
== ENOTTY
) &&
4050 zio
->io_type
== ZIO_TYPE_IOCTL
&&
4051 zio
->io_cmd
== DKIOCFLUSHWRITECACHE
&& vd
!= NULL
)
4052 vd
->vdev_nowritecache
= B_TRUE
;
4055 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
4057 if (vd
!= NULL
&& vd
->vdev_ops
->vdev_op_leaf
&&
4058 zio
->io_physdone
!= NULL
) {
4059 ASSERT(!(zio
->io_flags
& ZIO_FLAG_DELEGATED
));
4060 ASSERT(zio
->io_child_type
== ZIO_CHILD_VDEV
);
4061 zio
->io_physdone(zio
->io_logical
);
4068 zio_vdev_io_reissue(zio_t
*zio
)
4070 ASSERT(zio
->io_stage
== ZIO_STAGE_VDEV_IO_START
);
4071 ASSERT(zio
->io_error
== 0);
4073 zio
->io_stage
>>= 1;
4077 zio_vdev_io_redone(zio_t
*zio
)
4079 ASSERT(zio
->io_stage
== ZIO_STAGE_VDEV_IO_DONE
);
4081 zio
->io_stage
>>= 1;
4085 zio_vdev_io_bypass(zio_t
*zio
)
4087 ASSERT(zio
->io_stage
== ZIO_STAGE_VDEV_IO_START
);
4088 ASSERT(zio
->io_error
== 0);
4090 zio
->io_flags
|= ZIO_FLAG_IO_BYPASS
;
4091 zio
->io_stage
= ZIO_STAGE_VDEV_IO_ASSESS
>> 1;
4095 * ==========================================================================
4096 * Encrypt and store encryption parameters
4097 * ==========================================================================
4102 * This function is used for ZIO_STAGE_ENCRYPT. It is responsible for
4103 * managing the storage of encryption parameters and passing them to the
4104 * lower-level encryption functions.
4107 zio_encrypt(zio_t
*zio
)
4109 zio_prop_t
*zp
= &zio
->io_prop
;
4110 spa_t
*spa
= zio
->io_spa
;
4111 blkptr_t
*bp
= zio
->io_bp
;
4112 uint64_t psize
= BP_GET_PSIZE(bp
);
4113 uint64_t dsobj
= zio
->io_bookmark
.zb_objset
;
4114 dmu_object_type_t ot
= BP_GET_TYPE(bp
);
4115 void *enc_buf
= NULL
;
4117 uint8_t salt
[ZIO_DATA_SALT_LEN
];
4118 uint8_t iv
[ZIO_DATA_IV_LEN
];
4119 uint8_t mac
[ZIO_DATA_MAC_LEN
];
4120 boolean_t no_crypt
= B_FALSE
;
4122 /* the root zio already encrypted the data */
4123 if (zio
->io_child_type
== ZIO_CHILD_GANG
)
4126 /* only ZIL blocks are re-encrypted on rewrite */
4127 if (!IO_IS_ALLOCATING(zio
) && ot
!= DMU_OT_INTENT_LOG
)
4130 if (!(zp
->zp_encrypt
|| BP_IS_ENCRYPTED(bp
))) {
4131 BP_SET_CRYPT(bp
, B_FALSE
);
4135 /* if we are doing raw encryption set the provided encryption params */
4136 if (zio
->io_flags
& ZIO_FLAG_RAW_ENCRYPT
) {
4137 ASSERT0(BP_GET_LEVEL(bp
));
4138 BP_SET_CRYPT(bp
, B_TRUE
);
4139 BP_SET_BYTEORDER(bp
, zp
->zp_byteorder
);
4140 if (ot
!= DMU_OT_OBJSET
)
4141 zio_crypt_encode_mac_bp(bp
, zp
->zp_mac
);
4143 /* dnode blocks must be written out in the provided byteorder */
4144 if (zp
->zp_byteorder
!= ZFS_HOST_BYTEORDER
&&
4145 ot
== DMU_OT_DNODE
) {
4146 void *bswap_buf
= zio_buf_alloc(psize
);
4147 abd_t
*babd
= abd_get_from_buf(bswap_buf
, psize
);
4149 ASSERT3U(BP_GET_COMPRESS(bp
), ==, ZIO_COMPRESS_OFF
);
4150 abd_copy_to_buf(bswap_buf
, zio
->io_abd
, psize
);
4151 dmu_ot_byteswap
[DMU_OT_BYTESWAP(ot
)].ob_func(bswap_buf
,
4154 abd_take_ownership_of_buf(babd
, B_TRUE
);
4155 zio_push_transform(zio
, babd
, psize
, psize
, NULL
);
4158 if (DMU_OT_IS_ENCRYPTED(ot
))
4159 zio_crypt_encode_params_bp(bp
, zp
->zp_salt
, zp
->zp_iv
);
4163 /* indirect blocks only maintain a cksum of the lower level MACs */
4164 if (BP_GET_LEVEL(bp
) > 0) {
4165 BP_SET_CRYPT(bp
, B_TRUE
);
4166 VERIFY0(zio_crypt_do_indirect_mac_checksum_abd(B_TRUE
,
4167 zio
->io_orig_abd
, BP_GET_LSIZE(bp
), BP_SHOULD_BYTESWAP(bp
),
4169 zio_crypt_encode_mac_bp(bp
, mac
);
4174 * Objset blocks are a special case since they have 2 256-bit MACs
4175 * embedded within them.
4177 if (ot
== DMU_OT_OBJSET
) {
4178 ASSERT0(DMU_OT_IS_ENCRYPTED(ot
));
4179 ASSERT3U(BP_GET_COMPRESS(bp
), ==, ZIO_COMPRESS_OFF
);
4180 BP_SET_CRYPT(bp
, B_TRUE
);
4181 VERIFY0(spa_do_crypt_objset_mac_abd(B_TRUE
, spa
, dsobj
,
4182 zio
->io_abd
, psize
, BP_SHOULD_BYTESWAP(bp
)));
4186 /* unencrypted object types are only authenticated with a MAC */
4187 if (!DMU_OT_IS_ENCRYPTED(ot
)) {
4188 BP_SET_CRYPT(bp
, B_TRUE
);
4189 VERIFY0(spa_do_crypt_mac_abd(B_TRUE
, spa
, dsobj
,
4190 zio
->io_abd
, psize
, mac
));
4191 zio_crypt_encode_mac_bp(bp
, mac
);
4196 * Later passes of sync-to-convergence may decide to rewrite data
4197 * in place to avoid more disk reallocations. This presents a problem
4198 * for encryption because this constitutes rewriting the new data with
4199 * the same encryption key and IV. However, this only applies to blocks
4200 * in the MOS (particularly the spacemaps) and we do not encrypt the
4201 * MOS. We assert that the zio is allocating or an intent log write
4204 ASSERT(IO_IS_ALLOCATING(zio
) || ot
== DMU_OT_INTENT_LOG
);
4205 ASSERT(BP_GET_LEVEL(bp
) == 0 || ot
== DMU_OT_INTENT_LOG
);
4206 ASSERT(spa_feature_is_active(spa
, SPA_FEATURE_ENCRYPTION
));
4207 ASSERT3U(psize
, !=, 0);
4209 enc_buf
= zio_buf_alloc(psize
);
4210 eabd
= abd_get_from_buf(enc_buf
, psize
);
4211 abd_take_ownership_of_buf(eabd
, B_TRUE
);
4214 * For an explanation of what encryption parameters are stored
4215 * where, see the block comment in zio_crypt.c.
4217 if (ot
== DMU_OT_INTENT_LOG
) {
4218 zio_crypt_decode_params_bp(bp
, salt
, iv
);
4220 BP_SET_CRYPT(bp
, B_TRUE
);
4223 /* Perform the encryption. This should not fail */
4224 VERIFY0(spa_do_crypt_abd(B_TRUE
, spa
, &zio
->io_bookmark
,
4225 BP_GET_TYPE(bp
), BP_GET_DEDUP(bp
), BP_SHOULD_BYTESWAP(bp
),
4226 salt
, iv
, mac
, psize
, zio
->io_abd
, eabd
, &no_crypt
));
4228 /* encode encryption metadata into the bp */
4229 if (ot
== DMU_OT_INTENT_LOG
) {
4231 * ZIL blocks store the MAC in the embedded checksum, so the
4232 * transform must always be applied.
4234 zio_crypt_encode_mac_zil(enc_buf
, mac
);
4235 zio_push_transform(zio
, eabd
, psize
, psize
, NULL
);
4237 BP_SET_CRYPT(bp
, B_TRUE
);
4238 zio_crypt_encode_params_bp(bp
, salt
, iv
);
4239 zio_crypt_encode_mac_bp(bp
, mac
);
4242 ASSERT3U(ot
, ==, DMU_OT_DNODE
);
4245 zio_push_transform(zio
, eabd
, psize
, psize
, NULL
);
4253 * ==========================================================================
4254 * Generate and verify checksums
4255 * ==========================================================================
4258 zio_checksum_generate(zio_t
*zio
)
4260 blkptr_t
*bp
= zio
->io_bp
;
4261 enum zio_checksum checksum
;
4265 * This is zio_write_phys().
4266 * We're either generating a label checksum, or none at all.
4268 checksum
= zio
->io_prop
.zp_checksum
;
4270 if (checksum
== ZIO_CHECKSUM_OFF
)
4273 ASSERT(checksum
== ZIO_CHECKSUM_LABEL
);
4275 if (BP_IS_GANG(bp
) && zio
->io_child_type
== ZIO_CHILD_GANG
) {
4276 ASSERT(!IO_IS_ALLOCATING(zio
));
4277 checksum
= ZIO_CHECKSUM_GANG_HEADER
;
4279 checksum
= BP_GET_CHECKSUM(bp
);
4283 zio_checksum_compute(zio
, checksum
, zio
->io_abd
, zio
->io_size
);
4289 zio_checksum_verify(zio_t
*zio
)
4291 zio_bad_cksum_t info
;
4292 blkptr_t
*bp
= zio
->io_bp
;
4295 ASSERT(zio
->io_vd
!= NULL
);
4299 * This is zio_read_phys().
4300 * We're either verifying a label checksum, or nothing at all.
4302 if (zio
->io_prop
.zp_checksum
== ZIO_CHECKSUM_OFF
)
4305 ASSERT3U(zio
->io_prop
.zp_checksum
, ==, ZIO_CHECKSUM_LABEL
);
4308 if ((error
= zio_checksum_error(zio
, &info
)) != 0) {
4309 zio
->io_error
= error
;
4310 if (error
== ECKSUM
&&
4311 !(zio
->io_flags
& ZIO_FLAG_SPECULATIVE
)) {
4312 (void) zfs_ereport_start_checksum(zio
->io_spa
,
4313 zio
->io_vd
, &zio
->io_bookmark
, zio
,
4314 zio
->io_offset
, zio
->io_size
, &info
);
4315 mutex_enter(&zio
->io_vd
->vdev_stat_lock
);
4316 zio
->io_vd
->vdev_stat
.vs_checksum_errors
++;
4317 mutex_exit(&zio
->io_vd
->vdev_stat_lock
);
4325 * Called by RAID-Z to ensure we don't compute the checksum twice.
4328 zio_checksum_verified(zio_t
*zio
)
4330 zio
->io_pipeline
&= ~ZIO_STAGE_CHECKSUM_VERIFY
;
4334 * ==========================================================================
4335 * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other.
4336 * An error of 0 indicates success. ENXIO indicates whole-device failure,
4337 * which may be transient (e.g. unplugged) or permanent. ECKSUM and EIO
4338 * indicate errors that are specific to one I/O, and most likely permanent.
4339 * Any other error is presumed to be worse because we weren't expecting it.
4340 * ==========================================================================
4343 zio_worst_error(int e1
, int e2
)
4345 static int zio_error_rank
[] = { 0, ENXIO
, ECKSUM
, EIO
};
4348 for (r1
= 0; r1
< sizeof (zio_error_rank
) / sizeof (int); r1
++)
4349 if (e1
== zio_error_rank
[r1
])
4352 for (r2
= 0; r2
< sizeof (zio_error_rank
) / sizeof (int); r2
++)
4353 if (e2
== zio_error_rank
[r2
])
4356 return (r1
> r2
? e1
: e2
);
4360 * ==========================================================================
4362 * ==========================================================================
4365 zio_ready(zio_t
*zio
)
4367 blkptr_t
*bp
= zio
->io_bp
;
4368 zio_t
*pio
, *pio_next
;
4369 zio_link_t
*zl
= NULL
;
4371 if (zio_wait_for_children(zio
, ZIO_CHILD_GANG_BIT
| ZIO_CHILD_DDT_BIT
,
4376 if (zio
->io_ready
) {
4377 ASSERT(IO_IS_ALLOCATING(zio
));
4378 ASSERT(bp
->blk_birth
== zio
->io_txg
|| BP_IS_HOLE(bp
) ||
4379 (zio
->io_flags
& ZIO_FLAG_NOPWRITE
));
4380 ASSERT(zio
->io_children
[ZIO_CHILD_GANG
][ZIO_WAIT_READY
] == 0);
4385 if (bp
!= NULL
&& bp
!= &zio
->io_bp_copy
)
4386 zio
->io_bp_copy
= *bp
;
4388 if (zio
->io_error
!= 0) {
4389 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
4391 if (zio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
) {
4392 ASSERT(IO_IS_ALLOCATING(zio
));
4393 ASSERT(zio
->io_priority
== ZIO_PRIORITY_ASYNC_WRITE
);
4394 ASSERT(zio
->io_metaslab_class
!= NULL
);
4397 * We were unable to allocate anything, unreserve and
4398 * issue the next I/O to allocate.
4400 metaslab_class_throttle_unreserve(
4401 zio
->io_metaslab_class
, zio
->io_prop
.zp_copies
,
4402 zio
->io_allocator
, zio
);
4403 zio_allocate_dispatch(zio
->io_spa
, zio
->io_allocator
);
4407 mutex_enter(&zio
->io_lock
);
4408 zio
->io_state
[ZIO_WAIT_READY
] = 1;
4409 pio
= zio_walk_parents(zio
, &zl
);
4410 mutex_exit(&zio
->io_lock
);
4413 * As we notify zio's parents, new parents could be added.
4414 * New parents go to the head of zio's io_parent_list, however,
4415 * so we will (correctly) not notify them. The remainder of zio's
4416 * io_parent_list, from 'pio_next' onward, cannot change because
4417 * all parents must wait for us to be done before they can be done.
4419 for (; pio
!= NULL
; pio
= pio_next
) {
4420 pio_next
= zio_walk_parents(zio
, &zl
);
4421 zio_notify_parent(pio
, zio
, ZIO_WAIT_READY
, NULL
);
4424 if (zio
->io_flags
& ZIO_FLAG_NODATA
) {
4425 if (BP_IS_GANG(bp
)) {
4426 zio
->io_flags
&= ~ZIO_FLAG_NODATA
;
4428 ASSERT((uintptr_t)zio
->io_abd
< SPA_MAXBLOCKSIZE
);
4429 zio
->io_pipeline
&= ~ZIO_VDEV_IO_STAGES
;
4433 if (zio_injection_enabled
&&
4434 zio
->io_spa
->spa_syncing_txg
== zio
->io_txg
)
4435 zio_handle_ignored_writes(zio
);
4441 * Update the allocation throttle accounting.
4444 zio_dva_throttle_done(zio_t
*zio
)
4446 zio_t
*lio __maybe_unused
= zio
->io_logical
;
4447 zio_t
*pio
= zio_unique_parent(zio
);
4448 vdev_t
*vd
= zio
->io_vd
;
4449 int flags
= METASLAB_ASYNC_ALLOC
;
4451 ASSERT3P(zio
->io_bp
, !=, NULL
);
4452 ASSERT3U(zio
->io_type
, ==, ZIO_TYPE_WRITE
);
4453 ASSERT3U(zio
->io_priority
, ==, ZIO_PRIORITY_ASYNC_WRITE
);
4454 ASSERT3U(zio
->io_child_type
, ==, ZIO_CHILD_VDEV
);
4456 ASSERT3P(vd
, ==, vd
->vdev_top
);
4457 ASSERT(zio_injection_enabled
|| !(zio
->io_flags
& ZIO_FLAG_IO_RETRY
));
4458 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_REPAIR
));
4459 ASSERT(zio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
);
4460 ASSERT(!(lio
->io_flags
& ZIO_FLAG_IO_REWRITE
));
4461 ASSERT(!(lio
->io_orig_flags
& ZIO_FLAG_NODATA
));
4464 * Parents of gang children can have two flavors -- ones that
4465 * allocated the gang header (will have ZIO_FLAG_IO_REWRITE set)
4466 * and ones that allocated the constituent blocks. The allocation
4467 * throttle needs to know the allocating parent zio so we must find
4470 if (pio
->io_child_type
== ZIO_CHILD_GANG
) {
4472 * If our parent is a rewrite gang child then our grandparent
4473 * would have been the one that performed the allocation.
4475 if (pio
->io_flags
& ZIO_FLAG_IO_REWRITE
)
4476 pio
= zio_unique_parent(pio
);
4477 flags
|= METASLAB_GANG_CHILD
;
4480 ASSERT(IO_IS_ALLOCATING(pio
));
4481 ASSERT3P(zio
, !=, zio
->io_logical
);
4482 ASSERT(zio
->io_logical
!= NULL
);
4483 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_REPAIR
));
4484 ASSERT0(zio
->io_flags
& ZIO_FLAG_NOPWRITE
);
4485 ASSERT(zio
->io_metaslab_class
!= NULL
);
4487 mutex_enter(&pio
->io_lock
);
4488 metaslab_group_alloc_decrement(zio
->io_spa
, vd
->vdev_id
, pio
, flags
,
4489 pio
->io_allocator
, B_TRUE
);
4490 mutex_exit(&pio
->io_lock
);
4492 metaslab_class_throttle_unreserve(zio
->io_metaslab_class
, 1,
4493 pio
->io_allocator
, pio
);
4496 * Call into the pipeline to see if there is more work that
4497 * needs to be done. If there is work to be done it will be
4498 * dispatched to another taskq thread.
4500 zio_allocate_dispatch(zio
->io_spa
, pio
->io_allocator
);
4504 zio_done(zio_t
*zio
)
4507 * Always attempt to keep stack usage minimal here since
4508 * we can be called recursively up to 19 levels deep.
4510 const uint64_t psize
= zio
->io_size
;
4511 zio_t
*pio
, *pio_next
;
4512 zio_link_t
*zl
= NULL
;
4515 * If our children haven't all completed,
4516 * wait for them and then repeat this pipeline stage.
4518 if (zio_wait_for_children(zio
, ZIO_CHILD_ALL_BITS
, ZIO_WAIT_DONE
)) {
4523 * If the allocation throttle is enabled, then update the accounting.
4524 * We only track child I/Os that are part of an allocating async
4525 * write. We must do this since the allocation is performed
4526 * by the logical I/O but the actual write is done by child I/Os.
4528 if (zio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
&&
4529 zio
->io_child_type
== ZIO_CHILD_VDEV
) {
4530 ASSERT(zio
->io_metaslab_class
!= NULL
);
4531 ASSERT(zio
->io_metaslab_class
->mc_alloc_throttle_enabled
);
4532 zio_dva_throttle_done(zio
);
4536 * If the allocation throttle is enabled, verify that
4537 * we have decremented the refcounts for every I/O that was throttled.
4539 if (zio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
) {
4540 ASSERT(zio
->io_type
== ZIO_TYPE_WRITE
);
4541 ASSERT(zio
->io_priority
== ZIO_PRIORITY_ASYNC_WRITE
);
4542 ASSERT(zio
->io_bp
!= NULL
);
4544 metaslab_group_alloc_verify(zio
->io_spa
, zio
->io_bp
, zio
,
4546 VERIFY(zfs_refcount_not_held(&zio
->io_metaslab_class
->
4547 mc_allocator
[zio
->io_allocator
].mca_alloc_slots
, zio
));
4551 for (int c
= 0; c
< ZIO_CHILD_TYPES
; c
++)
4552 for (int w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
4553 ASSERT(zio
->io_children
[c
][w
] == 0);
4555 if (zio
->io_bp
!= NULL
&& !BP_IS_EMBEDDED(zio
->io_bp
)) {
4556 ASSERT(zio
->io_bp
->blk_pad
[0] == 0);
4557 ASSERT(zio
->io_bp
->blk_pad
[1] == 0);
4558 ASSERT(bcmp(zio
->io_bp
, &zio
->io_bp_copy
,
4559 sizeof (blkptr_t
)) == 0 ||
4560 (zio
->io_bp
== zio_unique_parent(zio
)->io_bp
));
4561 if (zio
->io_type
== ZIO_TYPE_WRITE
&& !BP_IS_HOLE(zio
->io_bp
) &&
4562 zio
->io_bp_override
== NULL
&&
4563 !(zio
->io_flags
& ZIO_FLAG_IO_REPAIR
)) {
4564 ASSERT3U(zio
->io_prop
.zp_copies
, <=,
4565 BP_GET_NDVAS(zio
->io_bp
));
4566 ASSERT(BP_COUNT_GANG(zio
->io_bp
) == 0 ||
4567 (BP_COUNT_GANG(zio
->io_bp
) ==
4568 BP_GET_NDVAS(zio
->io_bp
)));
4570 if (zio
->io_flags
& ZIO_FLAG_NOPWRITE
)
4571 VERIFY(BP_EQUAL(zio
->io_bp
, &zio
->io_bp_orig
));
4575 * If there were child vdev/gang/ddt errors, they apply to us now.
4577 zio_inherit_child_errors(zio
, ZIO_CHILD_VDEV
);
4578 zio_inherit_child_errors(zio
, ZIO_CHILD_GANG
);
4579 zio_inherit_child_errors(zio
, ZIO_CHILD_DDT
);
4582 * If the I/O on the transformed data was successful, generate any
4583 * checksum reports now while we still have the transformed data.
4585 if (zio
->io_error
== 0) {
4586 while (zio
->io_cksum_report
!= NULL
) {
4587 zio_cksum_report_t
*zcr
= zio
->io_cksum_report
;
4588 uint64_t align
= zcr
->zcr_align
;
4589 uint64_t asize
= P2ROUNDUP(psize
, align
);
4590 abd_t
*adata
= zio
->io_abd
;
4592 if (adata
!= NULL
&& asize
!= psize
) {
4593 adata
= abd_alloc(asize
, B_TRUE
);
4594 abd_copy(adata
, zio
->io_abd
, psize
);
4595 abd_zero_off(adata
, psize
, asize
- psize
);
4598 zio
->io_cksum_report
= zcr
->zcr_next
;
4599 zcr
->zcr_next
= NULL
;
4600 zcr
->zcr_finish(zcr
, adata
);
4601 zfs_ereport_free_checksum(zcr
);
4603 if (adata
!= NULL
&& asize
!= psize
)
4608 zio_pop_transforms(zio
); /* note: may set zio->io_error */
4610 vdev_stat_update(zio
, psize
);
4613 * If this I/O is attached to a particular vdev is slow, exceeding
4614 * 30 seconds to complete, post an error described the I/O delay.
4615 * We ignore these errors if the device is currently unavailable.
4617 if (zio
->io_delay
>= MSEC2NSEC(zio_slow_io_ms
)) {
4618 if (zio
->io_vd
!= NULL
&& !vdev_is_dead(zio
->io_vd
)) {
4620 * We want to only increment our slow IO counters if
4621 * the IO is valid (i.e. not if the drive is removed).
4623 * zfs_ereport_post() will also do these checks, but
4624 * it can also ratelimit and have other failures, so we
4625 * need to increment the slow_io counters independent
4628 if (zfs_ereport_is_valid(FM_EREPORT_ZFS_DELAY
,
4629 zio
->io_spa
, zio
->io_vd
, zio
)) {
4630 mutex_enter(&zio
->io_vd
->vdev_stat_lock
);
4631 zio
->io_vd
->vdev_stat
.vs_slow_ios
++;
4632 mutex_exit(&zio
->io_vd
->vdev_stat_lock
);
4634 (void) zfs_ereport_post(FM_EREPORT_ZFS_DELAY
,
4635 zio
->io_spa
, zio
->io_vd
, &zio
->io_bookmark
,
4641 if (zio
->io_error
) {
4643 * If this I/O is attached to a particular vdev,
4644 * generate an error message describing the I/O failure
4645 * at the block level. We ignore these errors if the
4646 * device is currently unavailable.
4648 if (zio
->io_error
!= ECKSUM
&& zio
->io_vd
!= NULL
&&
4649 !vdev_is_dead(zio
->io_vd
)) {
4650 int ret
= zfs_ereport_post(FM_EREPORT_ZFS_IO
,
4651 zio
->io_spa
, zio
->io_vd
, &zio
->io_bookmark
, zio
, 0);
4652 if (ret
!= EALREADY
) {
4653 mutex_enter(&zio
->io_vd
->vdev_stat_lock
);
4654 if (zio
->io_type
== ZIO_TYPE_READ
)
4655 zio
->io_vd
->vdev_stat
.vs_read_errors
++;
4656 else if (zio
->io_type
== ZIO_TYPE_WRITE
)
4657 zio
->io_vd
->vdev_stat
.vs_write_errors
++;
4658 mutex_exit(&zio
->io_vd
->vdev_stat_lock
);
4662 if ((zio
->io_error
== EIO
|| !(zio
->io_flags
&
4663 (ZIO_FLAG_SPECULATIVE
| ZIO_FLAG_DONT_PROPAGATE
))) &&
4664 zio
== zio
->io_logical
) {
4666 * For logical I/O requests, tell the SPA to log the
4667 * error and generate a logical data ereport.
4669 spa_log_error(zio
->io_spa
, &zio
->io_bookmark
);
4670 (void) zfs_ereport_post(FM_EREPORT_ZFS_DATA
,
4671 zio
->io_spa
, NULL
, &zio
->io_bookmark
, zio
, 0);
4675 if (zio
->io_error
&& zio
== zio
->io_logical
) {
4677 * Determine whether zio should be reexecuted. This will
4678 * propagate all the way to the root via zio_notify_parent().
4680 ASSERT(zio
->io_vd
== NULL
&& zio
->io_bp
!= NULL
);
4681 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
4683 if (IO_IS_ALLOCATING(zio
) &&
4684 !(zio
->io_flags
& ZIO_FLAG_CANFAIL
)) {
4685 if (zio
->io_error
!= ENOSPC
)
4686 zio
->io_reexecute
|= ZIO_REEXECUTE_NOW
;
4688 zio
->io_reexecute
|= ZIO_REEXECUTE_SUSPEND
;
4691 if ((zio
->io_type
== ZIO_TYPE_READ
||
4692 zio
->io_type
== ZIO_TYPE_FREE
) &&
4693 !(zio
->io_flags
& ZIO_FLAG_SCAN_THREAD
) &&
4694 zio
->io_error
== ENXIO
&&
4695 spa_load_state(zio
->io_spa
) == SPA_LOAD_NONE
&&
4696 spa_get_failmode(zio
->io_spa
) != ZIO_FAILURE_MODE_CONTINUE
)
4697 zio
->io_reexecute
|= ZIO_REEXECUTE_SUSPEND
;
4699 if (!(zio
->io_flags
& ZIO_FLAG_CANFAIL
) && !zio
->io_reexecute
)
4700 zio
->io_reexecute
|= ZIO_REEXECUTE_SUSPEND
;
4703 * Here is a possibly good place to attempt to do
4704 * either combinatorial reconstruction or error correction
4705 * based on checksums. It also might be a good place
4706 * to send out preliminary ereports before we suspend
4712 * If there were logical child errors, they apply to us now.
4713 * We defer this until now to avoid conflating logical child
4714 * errors with errors that happened to the zio itself when
4715 * updating vdev stats and reporting FMA events above.
4717 zio_inherit_child_errors(zio
, ZIO_CHILD_LOGICAL
);
4719 if ((zio
->io_error
|| zio
->io_reexecute
) &&
4720 IO_IS_ALLOCATING(zio
) && zio
->io_gang_leader
== zio
&&
4721 !(zio
->io_flags
& (ZIO_FLAG_IO_REWRITE
| ZIO_FLAG_NOPWRITE
)))
4722 zio_dva_unallocate(zio
, zio
->io_gang_tree
, zio
->io_bp
);
4724 zio_gang_tree_free(&zio
->io_gang_tree
);
4727 * Godfather I/Os should never suspend.
4729 if ((zio
->io_flags
& ZIO_FLAG_GODFATHER
) &&
4730 (zio
->io_reexecute
& ZIO_REEXECUTE_SUSPEND
))
4731 zio
->io_reexecute
&= ~ZIO_REEXECUTE_SUSPEND
;
4733 if (zio
->io_reexecute
) {
4735 * This is a logical I/O that wants to reexecute.
4737 * Reexecute is top-down. When an i/o fails, if it's not
4738 * the root, it simply notifies its parent and sticks around.
4739 * The parent, seeing that it still has children in zio_done(),
4740 * does the same. This percolates all the way up to the root.
4741 * The root i/o will reexecute or suspend the entire tree.
4743 * This approach ensures that zio_reexecute() honors
4744 * all the original i/o dependency relationships, e.g.
4745 * parents not executing until children are ready.
4747 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
4749 zio
->io_gang_leader
= NULL
;
4751 mutex_enter(&zio
->io_lock
);
4752 zio
->io_state
[ZIO_WAIT_DONE
] = 1;
4753 mutex_exit(&zio
->io_lock
);
4756 * "The Godfather" I/O monitors its children but is
4757 * not a true parent to them. It will track them through
4758 * the pipeline but severs its ties whenever they get into
4759 * trouble (e.g. suspended). This allows "The Godfather"
4760 * I/O to return status without blocking.
4763 for (pio
= zio_walk_parents(zio
, &zl
); pio
!= NULL
;
4765 zio_link_t
*remove_zl
= zl
;
4766 pio_next
= zio_walk_parents(zio
, &zl
);
4768 if ((pio
->io_flags
& ZIO_FLAG_GODFATHER
) &&
4769 (zio
->io_reexecute
& ZIO_REEXECUTE_SUSPEND
)) {
4770 zio_remove_child(pio
, zio
, remove_zl
);
4772 * This is a rare code path, so we don't
4773 * bother with "next_to_execute".
4775 zio_notify_parent(pio
, zio
, ZIO_WAIT_DONE
,
4780 if ((pio
= zio_unique_parent(zio
)) != NULL
) {
4782 * We're not a root i/o, so there's nothing to do
4783 * but notify our parent. Don't propagate errors
4784 * upward since we haven't permanently failed yet.
4786 ASSERT(!(zio
->io_flags
& ZIO_FLAG_GODFATHER
));
4787 zio
->io_flags
|= ZIO_FLAG_DONT_PROPAGATE
;
4789 * This is a rare code path, so we don't bother with
4790 * "next_to_execute".
4792 zio_notify_parent(pio
, zio
, ZIO_WAIT_DONE
, NULL
);
4793 } else if (zio
->io_reexecute
& ZIO_REEXECUTE_SUSPEND
) {
4795 * We'd fail again if we reexecuted now, so suspend
4796 * until conditions improve (e.g. device comes online).
4798 zio_suspend(zio
->io_spa
, zio
, ZIO_SUSPEND_IOERR
);
4801 * Reexecution is potentially a huge amount of work.
4802 * Hand it off to the otherwise-unused claim taskq.
4804 ASSERT(taskq_empty_ent(&zio
->io_tqent
));
4805 spa_taskq_dispatch_ent(zio
->io_spa
,
4806 ZIO_TYPE_CLAIM
, ZIO_TASKQ_ISSUE
,
4807 zio_reexecute
, zio
, 0, &zio
->io_tqent
);
4812 ASSERT(zio
->io_child_count
== 0);
4813 ASSERT(zio
->io_reexecute
== 0);
4814 ASSERT(zio
->io_error
== 0 || (zio
->io_flags
& ZIO_FLAG_CANFAIL
));
4817 * Report any checksum errors, since the I/O is complete.
4819 while (zio
->io_cksum_report
!= NULL
) {
4820 zio_cksum_report_t
*zcr
= zio
->io_cksum_report
;
4821 zio
->io_cksum_report
= zcr
->zcr_next
;
4822 zcr
->zcr_next
= NULL
;
4823 zcr
->zcr_finish(zcr
, NULL
);
4824 zfs_ereport_free_checksum(zcr
);
4827 if (zio
->io_flags
& ZIO_FLAG_FASTWRITE
&& zio
->io_bp
&&
4828 !BP_IS_HOLE(zio
->io_bp
) && !BP_IS_EMBEDDED(zio
->io_bp
) &&
4829 !(zio
->io_flags
& ZIO_FLAG_NOPWRITE
)) {
4830 metaslab_fastwrite_unmark(zio
->io_spa
, zio
->io_bp
);
4834 * It is the responsibility of the done callback to ensure that this
4835 * particular zio is no longer discoverable for adoption, and as
4836 * such, cannot acquire any new parents.
4841 mutex_enter(&zio
->io_lock
);
4842 zio
->io_state
[ZIO_WAIT_DONE
] = 1;
4843 mutex_exit(&zio
->io_lock
);
4846 * We are done executing this zio. We may want to execute a parent
4847 * next. See the comment in zio_notify_parent().
4849 zio_t
*next_to_execute
= NULL
;
4851 for (pio
= zio_walk_parents(zio
, &zl
); pio
!= NULL
; pio
= pio_next
) {
4852 zio_link_t
*remove_zl
= zl
;
4853 pio_next
= zio_walk_parents(zio
, &zl
);
4854 zio_remove_child(pio
, zio
, remove_zl
);
4855 zio_notify_parent(pio
, zio
, ZIO_WAIT_DONE
, &next_to_execute
);
4858 if (zio
->io_waiter
!= NULL
) {
4859 mutex_enter(&zio
->io_lock
);
4860 zio
->io_executor
= NULL
;
4861 cv_broadcast(&zio
->io_cv
);
4862 mutex_exit(&zio
->io_lock
);
4867 return (next_to_execute
);
4871 * ==========================================================================
4872 * I/O pipeline definition
4873 * ==========================================================================
4875 static zio_pipe_stage_t
*zio_pipeline
[] = {
4883 zio_checksum_generate
,
4899 zio_checksum_verify
,
4907 * Compare two zbookmark_phys_t's to see which we would reach first in a
4908 * pre-order traversal of the object tree.
4910 * This is simple in every case aside from the meta-dnode object. For all other
4911 * objects, we traverse them in order (object 1 before object 2, and so on).
4912 * However, all of these objects are traversed while traversing object 0, since
4913 * the data it points to is the list of objects. Thus, we need to convert to a
4914 * canonical representation so we can compare meta-dnode bookmarks to
4915 * non-meta-dnode bookmarks.
4917 * We do this by calculating "equivalents" for each field of the zbookmark.
4918 * zbookmarks outside of the meta-dnode use their own object and level, and
4919 * calculate the level 0 equivalent (the first L0 blkid that is contained in the
4920 * blocks this bookmark refers to) by multiplying their blkid by their span
4921 * (the number of L0 blocks contained within one block at their level).
4922 * zbookmarks inside the meta-dnode calculate their object equivalent
4923 * (which is L0equiv * dnodes per data block), use 0 for their L0equiv, and use
4924 * level + 1<<31 (any value larger than a level could ever be) for their level.
4925 * This causes them to always compare before a bookmark in their object
4926 * equivalent, compare appropriately to bookmarks in other objects, and to
4927 * compare appropriately to other bookmarks in the meta-dnode.
4930 zbookmark_compare(uint16_t dbss1
, uint8_t ibs1
, uint16_t dbss2
, uint8_t ibs2
,
4931 const zbookmark_phys_t
*zb1
, const zbookmark_phys_t
*zb2
)
4934 * These variables represent the "equivalent" values for the zbookmark,
4935 * after converting zbookmarks inside the meta dnode to their
4936 * normal-object equivalents.
4938 uint64_t zb1obj
, zb2obj
;
4939 uint64_t zb1L0
, zb2L0
;
4940 uint64_t zb1level
, zb2level
;
4942 if (zb1
->zb_object
== zb2
->zb_object
&&
4943 zb1
->zb_level
== zb2
->zb_level
&&
4944 zb1
->zb_blkid
== zb2
->zb_blkid
)
4947 IMPLY(zb1
->zb_level
> 0, ibs1
>= SPA_MINBLOCKSHIFT
);
4948 IMPLY(zb2
->zb_level
> 0, ibs2
>= SPA_MINBLOCKSHIFT
);
4951 * BP_SPANB calculates the span in blocks.
4953 zb1L0
= (zb1
->zb_blkid
) * BP_SPANB(ibs1
, zb1
->zb_level
);
4954 zb2L0
= (zb2
->zb_blkid
) * BP_SPANB(ibs2
, zb2
->zb_level
);
4956 if (zb1
->zb_object
== DMU_META_DNODE_OBJECT
) {
4957 zb1obj
= zb1L0
* (dbss1
<< (SPA_MINBLOCKSHIFT
- DNODE_SHIFT
));
4959 zb1level
= zb1
->zb_level
+ COMPARE_META_LEVEL
;
4961 zb1obj
= zb1
->zb_object
;
4962 zb1level
= zb1
->zb_level
;
4965 if (zb2
->zb_object
== DMU_META_DNODE_OBJECT
) {
4966 zb2obj
= zb2L0
* (dbss2
<< (SPA_MINBLOCKSHIFT
- DNODE_SHIFT
));
4968 zb2level
= zb2
->zb_level
+ COMPARE_META_LEVEL
;
4970 zb2obj
= zb2
->zb_object
;
4971 zb2level
= zb2
->zb_level
;
4974 /* Now that we have a canonical representation, do the comparison. */
4975 if (zb1obj
!= zb2obj
)
4976 return (zb1obj
< zb2obj
? -1 : 1);
4977 else if (zb1L0
!= zb2L0
)
4978 return (zb1L0
< zb2L0
? -1 : 1);
4979 else if (zb1level
!= zb2level
)
4980 return (zb1level
> zb2level
? -1 : 1);
4982 * This can (theoretically) happen if the bookmarks have the same object
4983 * and level, but different blkids, if the block sizes are not the same.
4984 * There is presently no way to change the indirect block sizes
4990 * This function checks the following: given that last_block is the place that
4991 * our traversal stopped last time, does that guarantee that we've visited
4992 * every node under subtree_root? Therefore, we can't just use the raw output
4993 * of zbookmark_compare. We have to pass in a modified version of
4994 * subtree_root; by incrementing the block id, and then checking whether
4995 * last_block is before or equal to that, we can tell whether or not having
4996 * visited last_block implies that all of subtree_root's children have been
5000 zbookmark_subtree_completed(const dnode_phys_t
*dnp
,
5001 const zbookmark_phys_t
*subtree_root
, const zbookmark_phys_t
*last_block
)
5003 zbookmark_phys_t mod_zb
= *subtree_root
;
5005 ASSERT(last_block
->zb_level
== 0);
5007 /* The objset_phys_t isn't before anything. */
5012 * We pass in 1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT) for the
5013 * data block size in sectors, because that variable is only used if
5014 * the bookmark refers to a block in the meta-dnode. Since we don't
5015 * know without examining it what object it refers to, and there's no
5016 * harm in passing in this value in other cases, we always pass it in.
5018 * We pass in 0 for the indirect block size shift because zb2 must be
5019 * level 0. The indirect block size is only used to calculate the span
5020 * of the bookmark, but since the bookmark must be level 0, the span is
5021 * always 1, so the math works out.
5023 * If you make changes to how the zbookmark_compare code works, be sure
5024 * to make sure that this code still works afterwards.
5026 return (zbookmark_compare(dnp
->dn_datablkszsec
, dnp
->dn_indblkshift
,
5027 1ULL << (DNODE_BLOCK_SHIFT
- SPA_MINBLOCKSHIFT
), 0, &mod_zb
,
5031 EXPORT_SYMBOL(zio_type_name
);
5032 EXPORT_SYMBOL(zio_buf_alloc
);
5033 EXPORT_SYMBOL(zio_data_buf_alloc
);
5034 EXPORT_SYMBOL(zio_buf_free
);
5035 EXPORT_SYMBOL(zio_data_buf_free
);
5037 ZFS_MODULE_PARAM(zfs_zio
, zio_
, slow_io_ms
, INT
, ZMOD_RW
,
5038 "Max I/O completion time (milliseconds) before marking it as slow");
5040 ZFS_MODULE_PARAM(zfs_zio
, zio_
, requeue_io_start_cut_in_line
, INT
, ZMOD_RW
,
5041 "Prioritize requeued I/O");
5043 ZFS_MODULE_PARAM(zfs
, zfs_
, sync_pass_deferred_free
, INT
, ZMOD_RW
,
5044 "Defer frees starting in this pass");
5046 ZFS_MODULE_PARAM(zfs
, zfs_
, sync_pass_dont_compress
, INT
, ZMOD_RW
,
5047 "Don't compress starting in this pass");
5049 ZFS_MODULE_PARAM(zfs
, zfs_
, sync_pass_rewrite
, INT
, ZMOD_RW
,
5050 "Rewrite new bps starting in this pass");
5052 ZFS_MODULE_PARAM(zfs_zio
, zio_
, dva_throttle_enabled
, INT
, ZMOD_RW
,
5053 "Throttle block allocations in the ZIO pipeline");
5055 ZFS_MODULE_PARAM(zfs_zio
, zio_
, deadman_log_all
, INT
, ZMOD_RW
,
5056 "Log all slow ZIOs, not just those with vdevs");