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 https://opensource.org/licenses/CDDL-1.0.
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
) ?
174 * If we are using watchpoints, put each buffer on its own page,
175 * to eliminate the performance overhead of trapping to the
176 * kernel when modifying a non-watched buffer that shares the
177 * page with a watched buffer.
179 if (arc_watch
&& !IS_P2ALIGNED(size
, PAGESIZE
))
182 * Here's the problem - on 4K native devices in userland on
183 * Linux using O_DIRECT, buffers must be 4K aligned or I/O
184 * will fail with EINVAL, causing zdb (and others) to coredump.
185 * Since userland probably doesn't need optimized buffer caches,
186 * we just force 4K alignment on everything.
188 align
= 8 * SPA_MINBLOCKSIZE
;
190 if (size
< PAGESIZE
) {
191 align
= SPA_MINBLOCKSIZE
;
192 } else if (IS_P2ALIGNED(size
, p2
>> 2)) {
199 if (cflags
== data_cflags
) {
201 * Resulting kmem caches would be identical.
202 * Save memory by creating only one.
204 (void) snprintf(name
, sizeof (name
),
205 "zio_buf_comb_%lu", (ulong_t
)size
);
206 zio_buf_cache
[c
] = kmem_cache_create(name
,
207 size
, align
, NULL
, NULL
, NULL
, NULL
, NULL
,
209 zio_data_buf_cache
[c
] = zio_buf_cache
[c
];
212 (void) snprintf(name
, sizeof (name
), "zio_buf_%lu",
214 zio_buf_cache
[c
] = kmem_cache_create(name
, size
,
215 align
, NULL
, NULL
, NULL
, NULL
, NULL
, cflags
);
217 (void) snprintf(name
, sizeof (name
), "zio_data_buf_%lu",
219 zio_data_buf_cache
[c
] = kmem_cache_create(name
, size
,
220 align
, NULL
, NULL
, NULL
, NULL
, NULL
, data_cflags
);
225 ASSERT(zio_buf_cache
[c
] != NULL
);
226 if (zio_buf_cache
[c
- 1] == NULL
)
227 zio_buf_cache
[c
- 1] = zio_buf_cache
[c
];
229 ASSERT(zio_data_buf_cache
[c
] != NULL
);
230 if (zio_data_buf_cache
[c
- 1] == NULL
)
231 zio_data_buf_cache
[c
- 1] = zio_data_buf_cache
[c
];
242 size_t n
= SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
;
244 #if defined(ZFS_DEBUG) && !defined(_KERNEL)
245 for (size_t i
= 0; i
< n
; i
++) {
246 if (zio_buf_cache_allocs
[i
] != zio_buf_cache_frees
[i
])
247 (void) printf("zio_fini: [%d] %llu != %llu\n",
248 (int)((i
+ 1) << SPA_MINBLOCKSHIFT
),
249 (long long unsigned)zio_buf_cache_allocs
[i
],
250 (long long unsigned)zio_buf_cache_frees
[i
]);
255 * The same kmem cache can show up multiple times in both zio_buf_cache
256 * and zio_data_buf_cache. Do a wasteful but trivially correct scan to
259 for (size_t i
= 0; i
< n
; i
++) {
260 kmem_cache_t
*cache
= zio_buf_cache
[i
];
263 for (size_t j
= i
; j
< n
; j
++) {
264 if (cache
== zio_buf_cache
[j
])
265 zio_buf_cache
[j
] = NULL
;
266 if (cache
== zio_data_buf_cache
[j
])
267 zio_data_buf_cache
[j
] = NULL
;
269 kmem_cache_destroy(cache
);
272 for (size_t i
= 0; i
< n
; i
++) {
273 kmem_cache_t
*cache
= zio_data_buf_cache
[i
];
276 for (size_t j
= i
; j
< n
; j
++) {
277 if (cache
== zio_data_buf_cache
[j
])
278 zio_data_buf_cache
[j
] = NULL
;
280 kmem_cache_destroy(cache
);
283 for (size_t i
= 0; i
< n
; i
++) {
284 VERIFY3P(zio_buf_cache
[i
], ==, NULL
);
285 VERIFY3P(zio_data_buf_cache
[i
], ==, NULL
);
288 kmem_cache_destroy(zio_link_cache
);
289 kmem_cache_destroy(zio_cache
);
297 * ==========================================================================
298 * Allocate and free I/O buffers
299 * ==========================================================================
303 * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a
304 * crashdump if the kernel panics, so use it judiciously. Obviously, it's
305 * useful to inspect ZFS metadata, but if possible, we should avoid keeping
306 * excess / transient data in-core during a crashdump.
309 zio_buf_alloc(size_t size
)
311 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
313 VERIFY3U(c
, <, SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
314 #if defined(ZFS_DEBUG) && !defined(_KERNEL)
315 atomic_add_64(&zio_buf_cache_allocs
[c
], 1);
318 return (kmem_cache_alloc(zio_buf_cache
[c
], KM_PUSHPAGE
));
322 * Use zio_data_buf_alloc to allocate data. The data will not appear in a
323 * crashdump if the kernel panics. This exists so that we will limit the amount
324 * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount
325 * of kernel heap dumped to disk when the kernel panics)
328 zio_data_buf_alloc(size_t size
)
330 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
332 VERIFY3U(c
, <, SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
334 return (kmem_cache_alloc(zio_data_buf_cache
[c
], KM_PUSHPAGE
));
338 zio_buf_free(void *buf
, size_t size
)
340 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
342 VERIFY3U(c
, <, SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
343 #if defined(ZFS_DEBUG) && !defined(_KERNEL)
344 atomic_add_64(&zio_buf_cache_frees
[c
], 1);
347 kmem_cache_free(zio_buf_cache
[c
], buf
);
351 zio_data_buf_free(void *buf
, size_t size
)
353 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
355 VERIFY3U(c
, <, SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
357 kmem_cache_free(zio_data_buf_cache
[c
], buf
);
361 zio_abd_free(void *abd
, size_t size
)
364 abd_free((abd_t
*)abd
);
368 * ==========================================================================
369 * Push and pop I/O transform buffers
370 * ==========================================================================
373 zio_push_transform(zio_t
*zio
, abd_t
*data
, uint64_t size
, uint64_t bufsize
,
374 zio_transform_func_t
*transform
)
376 zio_transform_t
*zt
= kmem_alloc(sizeof (zio_transform_t
), KM_SLEEP
);
378 zt
->zt_orig_abd
= zio
->io_abd
;
379 zt
->zt_orig_size
= zio
->io_size
;
380 zt
->zt_bufsize
= bufsize
;
381 zt
->zt_transform
= transform
;
383 zt
->zt_next
= zio
->io_transform_stack
;
384 zio
->io_transform_stack
= zt
;
391 zio_pop_transforms(zio_t
*zio
)
395 while ((zt
= zio
->io_transform_stack
) != NULL
) {
396 if (zt
->zt_transform
!= NULL
)
397 zt
->zt_transform(zio
,
398 zt
->zt_orig_abd
, zt
->zt_orig_size
);
400 if (zt
->zt_bufsize
!= 0)
401 abd_free(zio
->io_abd
);
403 zio
->io_abd
= zt
->zt_orig_abd
;
404 zio
->io_size
= zt
->zt_orig_size
;
405 zio
->io_transform_stack
= zt
->zt_next
;
407 kmem_free(zt
, sizeof (zio_transform_t
));
412 * ==========================================================================
413 * I/O transform callbacks for subblocks, decompression, and decryption
414 * ==========================================================================
417 zio_subblock(zio_t
*zio
, abd_t
*data
, uint64_t size
)
419 ASSERT(zio
->io_size
> size
);
421 if (zio
->io_type
== ZIO_TYPE_READ
)
422 abd_copy(data
, zio
->io_abd
, size
);
426 zio_decompress(zio_t
*zio
, abd_t
*data
, uint64_t size
)
428 if (zio
->io_error
== 0) {
429 void *tmp
= abd_borrow_buf(data
, size
);
430 int ret
= zio_decompress_data(BP_GET_COMPRESS(zio
->io_bp
),
431 zio
->io_abd
, tmp
, zio
->io_size
, size
,
432 &zio
->io_prop
.zp_complevel
);
433 abd_return_buf_copy(data
, tmp
, size
);
435 if (zio_injection_enabled
&& ret
== 0)
436 ret
= zio_handle_fault_injection(zio
, EINVAL
);
439 zio
->io_error
= SET_ERROR(EIO
);
444 zio_decrypt(zio_t
*zio
, abd_t
*data
, uint64_t size
)
448 blkptr_t
*bp
= zio
->io_bp
;
449 spa_t
*spa
= zio
->io_spa
;
450 uint64_t dsobj
= zio
->io_bookmark
.zb_objset
;
451 uint64_t lsize
= BP_GET_LSIZE(bp
);
452 dmu_object_type_t ot
= BP_GET_TYPE(bp
);
453 uint8_t salt
[ZIO_DATA_SALT_LEN
];
454 uint8_t iv
[ZIO_DATA_IV_LEN
];
455 uint8_t mac
[ZIO_DATA_MAC_LEN
];
456 boolean_t no_crypt
= B_FALSE
;
458 ASSERT(BP_USES_CRYPT(bp
));
459 ASSERT3U(size
, !=, 0);
461 if (zio
->io_error
!= 0)
465 * Verify the cksum of MACs stored in an indirect bp. It will always
466 * be possible to verify this since it does not require an encryption
469 if (BP_HAS_INDIRECT_MAC_CKSUM(bp
)) {
470 zio_crypt_decode_mac_bp(bp
, mac
);
472 if (BP_GET_COMPRESS(bp
) != ZIO_COMPRESS_OFF
) {
474 * We haven't decompressed the data yet, but
475 * zio_crypt_do_indirect_mac_checksum() requires
476 * decompressed data to be able to parse out the MACs
477 * from the indirect block. We decompress it now and
478 * throw away the result after we are finished.
480 tmp
= zio_buf_alloc(lsize
);
481 ret
= zio_decompress_data(BP_GET_COMPRESS(bp
),
482 zio
->io_abd
, tmp
, zio
->io_size
, lsize
,
483 &zio
->io_prop
.zp_complevel
);
485 ret
= SET_ERROR(EIO
);
488 ret
= zio_crypt_do_indirect_mac_checksum(B_FALSE
,
489 tmp
, lsize
, BP_SHOULD_BYTESWAP(bp
), mac
);
490 zio_buf_free(tmp
, lsize
);
492 ret
= zio_crypt_do_indirect_mac_checksum_abd(B_FALSE
,
493 zio
->io_abd
, size
, BP_SHOULD_BYTESWAP(bp
), mac
);
495 abd_copy(data
, zio
->io_abd
, size
);
497 if (zio_injection_enabled
&& ot
!= DMU_OT_DNODE
&& ret
== 0) {
498 ret
= zio_handle_decrypt_injection(spa
,
499 &zio
->io_bookmark
, ot
, ECKSUM
);
508 * If this is an authenticated block, just check the MAC. It would be
509 * nice to separate this out into its own flag, but for the moment
510 * enum zio_flag is out of bits.
512 if (BP_IS_AUTHENTICATED(bp
)) {
513 if (ot
== DMU_OT_OBJSET
) {
514 ret
= spa_do_crypt_objset_mac_abd(B_FALSE
, spa
,
515 dsobj
, zio
->io_abd
, size
, BP_SHOULD_BYTESWAP(bp
));
517 zio_crypt_decode_mac_bp(bp
, mac
);
518 ret
= spa_do_crypt_mac_abd(B_FALSE
, spa
, dsobj
,
519 zio
->io_abd
, size
, mac
);
520 if (zio_injection_enabled
&& ret
== 0) {
521 ret
= zio_handle_decrypt_injection(spa
,
522 &zio
->io_bookmark
, ot
, ECKSUM
);
525 abd_copy(data
, zio
->io_abd
, size
);
533 zio_crypt_decode_params_bp(bp
, salt
, iv
);
535 if (ot
== DMU_OT_INTENT_LOG
) {
536 tmp
= abd_borrow_buf_copy(zio
->io_abd
, sizeof (zil_chain_t
));
537 zio_crypt_decode_mac_zil(tmp
, mac
);
538 abd_return_buf(zio
->io_abd
, tmp
, sizeof (zil_chain_t
));
540 zio_crypt_decode_mac_bp(bp
, mac
);
543 ret
= spa_do_crypt_abd(B_FALSE
, spa
, &zio
->io_bookmark
, BP_GET_TYPE(bp
),
544 BP_GET_DEDUP(bp
), BP_SHOULD_BYTESWAP(bp
), salt
, iv
, mac
, size
, data
,
545 zio
->io_abd
, &no_crypt
);
547 abd_copy(data
, zio
->io_abd
, size
);
555 /* assert that the key was found unless this was speculative */
556 ASSERT(ret
!= EACCES
|| (zio
->io_flags
& ZIO_FLAG_SPECULATIVE
));
559 * If there was a decryption / authentication error return EIO as
560 * the io_error. If this was not a speculative zio, create an ereport.
563 zio
->io_error
= SET_ERROR(EIO
);
564 if ((zio
->io_flags
& ZIO_FLAG_SPECULATIVE
) == 0) {
565 spa_log_error(spa
, &zio
->io_bookmark
);
566 (void) zfs_ereport_post(FM_EREPORT_ZFS_AUTHENTICATION
,
567 spa
, NULL
, &zio
->io_bookmark
, zio
, 0);
575 * ==========================================================================
576 * I/O parent/child relationships and pipeline interlocks
577 * ==========================================================================
580 zio_walk_parents(zio_t
*cio
, zio_link_t
**zl
)
582 list_t
*pl
= &cio
->io_parent_list
;
584 *zl
= (*zl
== NULL
) ? list_head(pl
) : list_next(pl
, *zl
);
588 ASSERT((*zl
)->zl_child
== cio
);
589 return ((*zl
)->zl_parent
);
593 zio_walk_children(zio_t
*pio
, zio_link_t
**zl
)
595 list_t
*cl
= &pio
->io_child_list
;
597 ASSERT(MUTEX_HELD(&pio
->io_lock
));
599 *zl
= (*zl
== NULL
) ? list_head(cl
) : list_next(cl
, *zl
);
603 ASSERT((*zl
)->zl_parent
== pio
);
604 return ((*zl
)->zl_child
);
608 zio_unique_parent(zio_t
*cio
)
610 zio_link_t
*zl
= NULL
;
611 zio_t
*pio
= zio_walk_parents(cio
, &zl
);
613 VERIFY3P(zio_walk_parents(cio
, &zl
), ==, NULL
);
618 zio_add_child(zio_t
*pio
, zio_t
*cio
)
620 zio_link_t
*zl
= kmem_cache_alloc(zio_link_cache
, KM_SLEEP
);
623 * Logical I/Os can have logical, gang, or vdev children.
624 * Gang I/Os can have gang or vdev children.
625 * Vdev I/Os can only have vdev children.
626 * The following ASSERT captures all of these constraints.
628 ASSERT3S(cio
->io_child_type
, <=, pio
->io_child_type
);
633 mutex_enter(&pio
->io_lock
);
634 mutex_enter(&cio
->io_lock
);
636 ASSERT(pio
->io_state
[ZIO_WAIT_DONE
] == 0);
638 for (int w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
639 pio
->io_children
[cio
->io_child_type
][w
] += !cio
->io_state
[w
];
641 list_insert_head(&pio
->io_child_list
, zl
);
642 list_insert_head(&cio
->io_parent_list
, zl
);
644 pio
->io_child_count
++;
645 cio
->io_parent_count
++;
647 mutex_exit(&cio
->io_lock
);
648 mutex_exit(&pio
->io_lock
);
652 zio_remove_child(zio_t
*pio
, zio_t
*cio
, zio_link_t
*zl
)
654 ASSERT(zl
->zl_parent
== pio
);
655 ASSERT(zl
->zl_child
== cio
);
657 mutex_enter(&pio
->io_lock
);
658 mutex_enter(&cio
->io_lock
);
660 list_remove(&pio
->io_child_list
, zl
);
661 list_remove(&cio
->io_parent_list
, zl
);
663 pio
->io_child_count
--;
664 cio
->io_parent_count
--;
666 mutex_exit(&cio
->io_lock
);
667 mutex_exit(&pio
->io_lock
);
668 kmem_cache_free(zio_link_cache
, zl
);
672 zio_wait_for_children(zio_t
*zio
, uint8_t childbits
, enum zio_wait_type wait
)
674 boolean_t waiting
= B_FALSE
;
676 mutex_enter(&zio
->io_lock
);
677 ASSERT(zio
->io_stall
== NULL
);
678 for (int c
= 0; c
< ZIO_CHILD_TYPES
; c
++) {
679 if (!(ZIO_CHILD_BIT_IS_SET(childbits
, c
)))
682 uint64_t *countp
= &zio
->io_children
[c
][wait
];
685 ASSERT3U(zio
->io_stage
, !=, ZIO_STAGE_OPEN
);
686 zio
->io_stall
= countp
;
691 mutex_exit(&zio
->io_lock
);
695 __attribute__((always_inline
))
697 zio_notify_parent(zio_t
*pio
, zio_t
*zio
, enum zio_wait_type wait
,
698 zio_t
**next_to_executep
)
700 uint64_t *countp
= &pio
->io_children
[zio
->io_child_type
][wait
];
701 int *errorp
= &pio
->io_child_error
[zio
->io_child_type
];
703 mutex_enter(&pio
->io_lock
);
704 if (zio
->io_error
&& !(zio
->io_flags
& ZIO_FLAG_DONT_PROPAGATE
))
705 *errorp
= zio_worst_error(*errorp
, zio
->io_error
);
706 pio
->io_reexecute
|= zio
->io_reexecute
;
707 ASSERT3U(*countp
, >, 0);
711 if (*countp
== 0 && pio
->io_stall
== countp
) {
712 zio_taskq_type_t type
=
713 pio
->io_stage
< ZIO_STAGE_VDEV_IO_START
? ZIO_TASKQ_ISSUE
:
715 pio
->io_stall
= NULL
;
716 mutex_exit(&pio
->io_lock
);
719 * If we can tell the caller to execute this parent next, do
720 * so. Otherwise dispatch the parent zio as its own task.
722 * Having the caller execute the parent when possible reduces
723 * locking on the zio taskq's, reduces context switch
724 * overhead, and has no recursion penalty. Note that one
725 * read from disk typically causes at least 3 zio's: a
726 * zio_null(), the logical zio_read(), and then a physical
727 * zio. When the physical ZIO completes, we are able to call
728 * zio_done() on all 3 of these zio's from one invocation of
729 * zio_execute() by returning the parent back to
730 * zio_execute(). Since the parent isn't executed until this
731 * thread returns back to zio_execute(), the caller should do
734 * In other cases, dispatching the parent prevents
735 * overflowing the stack when we have deeply nested
736 * parent-child relationships, as we do with the "mega zio"
737 * of writes for spa_sync(), and the chain of ZIL blocks.
739 if (next_to_executep
!= NULL
&& *next_to_executep
== NULL
) {
740 *next_to_executep
= pio
;
742 zio_taskq_dispatch(pio
, type
, B_FALSE
);
745 mutex_exit(&pio
->io_lock
);
750 zio_inherit_child_errors(zio_t
*zio
, enum zio_child c
)
752 if (zio
->io_child_error
[c
] != 0 && zio
->io_error
== 0)
753 zio
->io_error
= zio
->io_child_error
[c
];
757 zio_bookmark_compare(const void *x1
, const void *x2
)
759 const zio_t
*z1
= x1
;
760 const zio_t
*z2
= x2
;
762 if (z1
->io_bookmark
.zb_objset
< z2
->io_bookmark
.zb_objset
)
764 if (z1
->io_bookmark
.zb_objset
> z2
->io_bookmark
.zb_objset
)
767 if (z1
->io_bookmark
.zb_object
< z2
->io_bookmark
.zb_object
)
769 if (z1
->io_bookmark
.zb_object
> z2
->io_bookmark
.zb_object
)
772 if (z1
->io_bookmark
.zb_level
< z2
->io_bookmark
.zb_level
)
774 if (z1
->io_bookmark
.zb_level
> z2
->io_bookmark
.zb_level
)
777 if (z1
->io_bookmark
.zb_blkid
< z2
->io_bookmark
.zb_blkid
)
779 if (z1
->io_bookmark
.zb_blkid
> z2
->io_bookmark
.zb_blkid
)
791 * ==========================================================================
792 * Create the various types of I/O (read, write, free, etc)
793 * ==========================================================================
796 zio_create(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
,
797 abd_t
*data
, uint64_t lsize
, uint64_t psize
, zio_done_func_t
*done
,
798 void *private, zio_type_t type
, zio_priority_t priority
,
799 enum zio_flag flags
, vdev_t
*vd
, uint64_t offset
,
800 const zbookmark_phys_t
*zb
, enum zio_stage stage
,
801 enum zio_stage pipeline
)
805 IMPLY(type
!= ZIO_TYPE_TRIM
, psize
<= SPA_MAXBLOCKSIZE
);
806 ASSERT(P2PHASE(psize
, SPA_MINBLOCKSIZE
) == 0);
807 ASSERT(P2PHASE(offset
, SPA_MINBLOCKSIZE
) == 0);
809 ASSERT(!vd
|| spa_config_held(spa
, SCL_STATE_ALL
, RW_READER
));
810 ASSERT(!bp
|| !(flags
& ZIO_FLAG_CONFIG_WRITER
));
811 ASSERT(vd
|| stage
== ZIO_STAGE_OPEN
);
813 IMPLY(lsize
!= psize
, (flags
& ZIO_FLAG_RAW_COMPRESS
) != 0);
815 zio
= kmem_cache_alloc(zio_cache
, KM_SLEEP
);
816 memset(zio
, 0, sizeof (zio_t
));
818 mutex_init(&zio
->io_lock
, NULL
, MUTEX_NOLOCKDEP
, NULL
);
819 cv_init(&zio
->io_cv
, NULL
, CV_DEFAULT
, NULL
);
821 list_create(&zio
->io_parent_list
, sizeof (zio_link_t
),
822 offsetof(zio_link_t
, zl_parent_node
));
823 list_create(&zio
->io_child_list
, sizeof (zio_link_t
),
824 offsetof(zio_link_t
, zl_child_node
));
825 metaslab_trace_init(&zio
->io_alloc_list
);
828 zio
->io_child_type
= ZIO_CHILD_VDEV
;
829 else if (flags
& ZIO_FLAG_GANG_CHILD
)
830 zio
->io_child_type
= ZIO_CHILD_GANG
;
831 else if (flags
& ZIO_FLAG_DDT_CHILD
)
832 zio
->io_child_type
= ZIO_CHILD_DDT
;
834 zio
->io_child_type
= ZIO_CHILD_LOGICAL
;
837 zio
->io_bp
= (blkptr_t
*)bp
;
838 zio
->io_bp_copy
= *bp
;
839 zio
->io_bp_orig
= *bp
;
840 if (type
!= ZIO_TYPE_WRITE
||
841 zio
->io_child_type
== ZIO_CHILD_DDT
)
842 zio
->io_bp
= &zio
->io_bp_copy
; /* so caller can free */
843 if (zio
->io_child_type
== ZIO_CHILD_LOGICAL
)
844 zio
->io_logical
= zio
;
845 if (zio
->io_child_type
> ZIO_CHILD_GANG
&& BP_IS_GANG(bp
))
846 pipeline
|= ZIO_GANG_STAGES
;
852 zio
->io_private
= private;
854 zio
->io_priority
= priority
;
856 zio
->io_offset
= offset
;
857 zio
->io_orig_abd
= zio
->io_abd
= data
;
858 zio
->io_orig_size
= zio
->io_size
= psize
;
859 zio
->io_lsize
= lsize
;
860 zio
->io_orig_flags
= zio
->io_flags
= flags
;
861 zio
->io_orig_stage
= zio
->io_stage
= stage
;
862 zio
->io_orig_pipeline
= zio
->io_pipeline
= pipeline
;
863 zio
->io_pipeline_trace
= ZIO_STAGE_OPEN
;
865 zio
->io_state
[ZIO_WAIT_READY
] = (stage
>= ZIO_STAGE_READY
);
866 zio
->io_state
[ZIO_WAIT_DONE
] = (stage
>= ZIO_STAGE_DONE
);
869 zio
->io_bookmark
= *zb
;
872 zio
->io_metaslab_class
= pio
->io_metaslab_class
;
873 if (zio
->io_logical
== NULL
)
874 zio
->io_logical
= pio
->io_logical
;
875 if (zio
->io_child_type
== ZIO_CHILD_GANG
)
876 zio
->io_gang_leader
= pio
->io_gang_leader
;
877 zio_add_child(pio
, zio
);
880 taskq_init_ent(&zio
->io_tqent
);
886 zio_destroy(zio_t
*zio
)
888 metaslab_trace_fini(&zio
->io_alloc_list
);
889 list_destroy(&zio
->io_parent_list
);
890 list_destroy(&zio
->io_child_list
);
891 mutex_destroy(&zio
->io_lock
);
892 cv_destroy(&zio
->io_cv
);
893 kmem_cache_free(zio_cache
, zio
);
897 zio_null(zio_t
*pio
, spa_t
*spa
, vdev_t
*vd
, zio_done_func_t
*done
,
898 void *private, enum zio_flag flags
)
902 zio
= zio_create(pio
, spa
, 0, NULL
, NULL
, 0, 0, done
, private,
903 ZIO_TYPE_NULL
, ZIO_PRIORITY_NOW
, flags
, vd
, 0, NULL
,
904 ZIO_STAGE_OPEN
, ZIO_INTERLOCK_PIPELINE
);
910 zio_root(spa_t
*spa
, zio_done_func_t
*done
, void *private, enum zio_flag flags
)
912 return (zio_null(NULL
, spa
, NULL
, done
, private, flags
));
916 zfs_blkptr_verify_log(spa_t
*spa
, const blkptr_t
*bp
,
917 enum blk_verify_flag blk_verify
, const char *fmt
, ...)
923 (void) vsnprintf(buf
, sizeof (buf
), fmt
, adx
);
926 switch (blk_verify
) {
927 case BLK_VERIFY_HALT
:
928 dprintf_bp(bp
, "blkptr at %p dprintf_bp():", bp
);
929 zfs_panic_recover("%s: %s", spa_name(spa
), buf
);
932 zfs_dbgmsg("%s: %s", spa_name(spa
), buf
);
934 case BLK_VERIFY_ONLY
:
942 * Verify the block pointer fields contain reasonable values. This means
943 * it only contains known object types, checksum/compression identifiers,
944 * block sizes within the maximum allowed limits, valid DVAs, etc.
946 * If everything checks out B_TRUE is returned. The zfs_blkptr_verify
947 * argument controls the behavior when an invalid field is detected.
949 * Modes for zfs_blkptr_verify:
950 * 1) BLK_VERIFY_ONLY (evaluate the block)
951 * 2) BLK_VERIFY_LOG (evaluate the block and log problems)
952 * 3) BLK_VERIFY_HALT (call zfs_panic_recover on error)
955 zfs_blkptr_verify(spa_t
*spa
, const blkptr_t
*bp
, boolean_t config_held
,
956 enum blk_verify_flag blk_verify
)
960 if (!DMU_OT_IS_VALID(BP_GET_TYPE(bp
))) {
961 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
962 "blkptr at %p has invalid TYPE %llu",
963 bp
, (longlong_t
)BP_GET_TYPE(bp
));
965 if (BP_GET_CHECKSUM(bp
) >= ZIO_CHECKSUM_FUNCTIONS
) {
966 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
967 "blkptr at %p has invalid CHECKSUM %llu",
968 bp
, (longlong_t
)BP_GET_CHECKSUM(bp
));
970 if (BP_GET_COMPRESS(bp
) >= ZIO_COMPRESS_FUNCTIONS
) {
971 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
972 "blkptr at %p has invalid COMPRESS %llu",
973 bp
, (longlong_t
)BP_GET_COMPRESS(bp
));
975 if (BP_GET_LSIZE(bp
) > SPA_MAXBLOCKSIZE
) {
976 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
977 "blkptr at %p has invalid LSIZE %llu",
978 bp
, (longlong_t
)BP_GET_LSIZE(bp
));
980 if (BP_GET_PSIZE(bp
) > SPA_MAXBLOCKSIZE
) {
981 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
982 "blkptr at %p has invalid PSIZE %llu",
983 bp
, (longlong_t
)BP_GET_PSIZE(bp
));
986 if (BP_IS_EMBEDDED(bp
)) {
987 if (BPE_GET_ETYPE(bp
) >= NUM_BP_EMBEDDED_TYPES
) {
988 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
989 "blkptr at %p has invalid ETYPE %llu",
990 bp
, (longlong_t
)BPE_GET_ETYPE(bp
));
995 * Do not verify individual DVAs if the config is not trusted. This
996 * will be done once the zio is executed in vdev_mirror_map_alloc.
998 if (!spa
->spa_trust_config
)
999 return (errors
== 0);
1002 spa_config_enter(spa
, SCL_VDEV
, bp
, RW_READER
);
1004 ASSERT(spa_config_held(spa
, SCL_VDEV
, RW_WRITER
));
1006 * Pool-specific checks.
1008 * Note: it would be nice to verify that the blk_birth and
1009 * BP_PHYSICAL_BIRTH() are not too large. However, spa_freeze()
1010 * allows the birth time of log blocks (and dmu_sync()-ed blocks
1011 * that are in the log) to be arbitrarily large.
1013 for (int i
= 0; i
< BP_GET_NDVAS(bp
); i
++) {
1014 const dva_t
*dva
= &bp
->blk_dva
[i
];
1015 uint64_t vdevid
= DVA_GET_VDEV(dva
);
1017 if (vdevid
>= spa
->spa_root_vdev
->vdev_children
) {
1018 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
1019 "blkptr at %p DVA %u has invalid VDEV %llu",
1020 bp
, i
, (longlong_t
)vdevid
);
1023 vdev_t
*vd
= spa
->spa_root_vdev
->vdev_child
[vdevid
];
1025 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
1026 "blkptr at %p DVA %u has invalid VDEV %llu",
1027 bp
, i
, (longlong_t
)vdevid
);
1030 if (vd
->vdev_ops
== &vdev_hole_ops
) {
1031 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
1032 "blkptr at %p DVA %u has hole VDEV %llu",
1033 bp
, i
, (longlong_t
)vdevid
);
1036 if (vd
->vdev_ops
== &vdev_missing_ops
) {
1038 * "missing" vdevs are valid during import, but we
1039 * don't have their detailed info (e.g. asize), so
1040 * we can't perform any more checks on them.
1044 uint64_t offset
= DVA_GET_OFFSET(dva
);
1045 uint64_t asize
= DVA_GET_ASIZE(dva
);
1046 if (DVA_GET_GANG(dva
))
1047 asize
= vdev_gang_header_asize(vd
);
1048 if (offset
+ asize
> vd
->vdev_asize
) {
1049 errors
+= zfs_blkptr_verify_log(spa
, bp
, blk_verify
,
1050 "blkptr at %p DVA %u has invalid OFFSET %llu",
1051 bp
, i
, (longlong_t
)offset
);
1055 dprintf_bp(bp
, "blkptr at %p dprintf_bp():", bp
);
1057 spa_config_exit(spa
, SCL_VDEV
, bp
);
1059 return (errors
== 0);
1063 zfs_dva_valid(spa_t
*spa
, const dva_t
*dva
, const blkptr_t
*bp
)
1066 uint64_t vdevid
= DVA_GET_VDEV(dva
);
1068 if (vdevid
>= spa
->spa_root_vdev
->vdev_children
)
1071 vdev_t
*vd
= spa
->spa_root_vdev
->vdev_child
[vdevid
];
1075 if (vd
->vdev_ops
== &vdev_hole_ops
)
1078 if (vd
->vdev_ops
== &vdev_missing_ops
) {
1082 uint64_t offset
= DVA_GET_OFFSET(dva
);
1083 uint64_t asize
= DVA_GET_ASIZE(dva
);
1085 if (DVA_GET_GANG(dva
))
1086 asize
= vdev_gang_header_asize(vd
);
1087 if (offset
+ asize
> vd
->vdev_asize
)
1094 zio_read(zio_t
*pio
, spa_t
*spa
, const blkptr_t
*bp
,
1095 abd_t
*data
, uint64_t size
, zio_done_func_t
*done
, void *private,
1096 zio_priority_t priority
, enum zio_flag flags
, const zbookmark_phys_t
*zb
)
1100 zio
= zio_create(pio
, spa
, BP_PHYSICAL_BIRTH(bp
), bp
,
1101 data
, size
, size
, done
, private,
1102 ZIO_TYPE_READ
, priority
, flags
, NULL
, 0, zb
,
1103 ZIO_STAGE_OPEN
, (flags
& ZIO_FLAG_DDT_CHILD
) ?
1104 ZIO_DDT_CHILD_READ_PIPELINE
: ZIO_READ_PIPELINE
);
1110 zio_write(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, blkptr_t
*bp
,
1111 abd_t
*data
, uint64_t lsize
, uint64_t psize
, const zio_prop_t
*zp
,
1112 zio_done_func_t
*ready
, zio_done_func_t
*children_ready
,
1113 zio_done_func_t
*physdone
, zio_done_func_t
*done
,
1114 void *private, zio_priority_t priority
, enum zio_flag flags
,
1115 const zbookmark_phys_t
*zb
)
1119 ASSERT(zp
->zp_checksum
>= ZIO_CHECKSUM_OFF
&&
1120 zp
->zp_checksum
< ZIO_CHECKSUM_FUNCTIONS
&&
1121 zp
->zp_compress
>= ZIO_COMPRESS_OFF
&&
1122 zp
->zp_compress
< ZIO_COMPRESS_FUNCTIONS
&&
1123 DMU_OT_IS_VALID(zp
->zp_type
) &&
1124 zp
->zp_level
< 32 &&
1125 zp
->zp_copies
> 0 &&
1126 zp
->zp_copies
<= spa_max_replication(spa
));
1128 zio
= zio_create(pio
, spa
, txg
, bp
, data
, lsize
, psize
, done
, private,
1129 ZIO_TYPE_WRITE
, priority
, flags
, NULL
, 0, zb
,
1130 ZIO_STAGE_OPEN
, (flags
& ZIO_FLAG_DDT_CHILD
) ?
1131 ZIO_DDT_CHILD_WRITE_PIPELINE
: ZIO_WRITE_PIPELINE
);
1133 zio
->io_ready
= ready
;
1134 zio
->io_children_ready
= children_ready
;
1135 zio
->io_physdone
= physdone
;
1139 * Data can be NULL if we are going to call zio_write_override() to
1140 * provide the already-allocated BP. But we may need the data to
1141 * verify a dedup hit (if requested). In this case, don't try to
1142 * dedup (just take the already-allocated BP verbatim). Encrypted
1143 * dedup blocks need data as well so we also disable dedup in this
1147 (zio
->io_prop
.zp_dedup_verify
|| zio
->io_prop
.zp_encrypt
)) {
1148 zio
->io_prop
.zp_dedup
= zio
->io_prop
.zp_dedup_verify
= B_FALSE
;
1155 zio_rewrite(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, blkptr_t
*bp
, abd_t
*data
,
1156 uint64_t size
, zio_done_func_t
*done
, void *private,
1157 zio_priority_t priority
, enum zio_flag flags
, zbookmark_phys_t
*zb
)
1161 zio
= zio_create(pio
, spa
, txg
, bp
, data
, size
, size
, done
, private,
1162 ZIO_TYPE_WRITE
, priority
, flags
| ZIO_FLAG_IO_REWRITE
, NULL
, 0, zb
,
1163 ZIO_STAGE_OPEN
, ZIO_REWRITE_PIPELINE
);
1169 zio_write_override(zio_t
*zio
, blkptr_t
*bp
, int copies
, boolean_t nopwrite
)
1171 ASSERT(zio
->io_type
== ZIO_TYPE_WRITE
);
1172 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1173 ASSERT(zio
->io_stage
== ZIO_STAGE_OPEN
);
1174 ASSERT(zio
->io_txg
== spa_syncing_txg(zio
->io_spa
));
1177 * We must reset the io_prop to match the values that existed
1178 * when the bp was first written by dmu_sync() keeping in mind
1179 * that nopwrite and dedup are mutually exclusive.
1181 zio
->io_prop
.zp_dedup
= nopwrite
? B_FALSE
: zio
->io_prop
.zp_dedup
;
1182 zio
->io_prop
.zp_nopwrite
= nopwrite
;
1183 zio
->io_prop
.zp_copies
= copies
;
1184 zio
->io_bp_override
= bp
;
1188 zio_free(spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
)
1191 (void) zfs_blkptr_verify(spa
, bp
, B_FALSE
, BLK_VERIFY_HALT
);
1194 * The check for EMBEDDED is a performance optimization. We
1195 * process the free here (by ignoring it) rather than
1196 * putting it on the list and then processing it in zio_free_sync().
1198 if (BP_IS_EMBEDDED(bp
))
1200 metaslab_check_free(spa
, bp
);
1203 * Frees that are for the currently-syncing txg, are not going to be
1204 * deferred, and which will not need to do a read (i.e. not GANG or
1205 * DEDUP), can be processed immediately. Otherwise, put them on the
1206 * in-memory list for later processing.
1208 * Note that we only defer frees after zfs_sync_pass_deferred_free
1209 * when the log space map feature is disabled. [see relevant comment
1210 * in spa_sync_iterate_to_convergence()]
1212 if (BP_IS_GANG(bp
) ||
1214 txg
!= spa
->spa_syncing_txg
||
1215 (spa_sync_pass(spa
) >= zfs_sync_pass_deferred_free
&&
1216 !spa_feature_is_active(spa
, SPA_FEATURE_LOG_SPACEMAP
))) {
1217 bplist_append(&spa
->spa_free_bplist
[txg
& TXG_MASK
], bp
);
1219 VERIFY3P(zio_free_sync(NULL
, spa
, txg
, bp
, 0), ==, NULL
);
1224 * To improve performance, this function may return NULL if we were able
1225 * to do the free immediately. This avoids the cost of creating a zio
1226 * (and linking it to the parent, etc).
1229 zio_free_sync(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
,
1230 enum zio_flag flags
)
1232 ASSERT(!BP_IS_HOLE(bp
));
1233 ASSERT(spa_syncing_txg(spa
) == txg
);
1235 if (BP_IS_EMBEDDED(bp
))
1238 metaslab_check_free(spa
, bp
);
1240 dsl_scan_freed(spa
, bp
);
1242 if (BP_IS_GANG(bp
) || BP_GET_DEDUP(bp
)) {
1244 * GANG and DEDUP blocks can induce a read (for the gang block
1245 * header, or the DDT), so issue them asynchronously so that
1246 * this thread is not tied up.
1248 enum zio_stage stage
=
1249 ZIO_FREE_PIPELINE
| ZIO_STAGE_ISSUE_ASYNC
;
1251 return (zio_create(pio
, spa
, txg
, bp
, NULL
, BP_GET_PSIZE(bp
),
1252 BP_GET_PSIZE(bp
), NULL
, NULL
,
1253 ZIO_TYPE_FREE
, ZIO_PRIORITY_NOW
,
1254 flags
, NULL
, 0, NULL
, ZIO_STAGE_OPEN
, stage
));
1256 metaslab_free(spa
, bp
, txg
, B_FALSE
);
1262 zio_claim(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
,
1263 zio_done_func_t
*done
, void *private, enum zio_flag flags
)
1267 (void) zfs_blkptr_verify(spa
, bp
, flags
& ZIO_FLAG_CONFIG_WRITER
,
1270 if (BP_IS_EMBEDDED(bp
))
1271 return (zio_null(pio
, spa
, NULL
, NULL
, NULL
, 0));
1274 * A claim is an allocation of a specific block. Claims are needed
1275 * to support immediate writes in the intent log. The issue is that
1276 * immediate writes contain committed data, but in a txg that was
1277 * *not* committed. Upon opening the pool after an unclean shutdown,
1278 * the intent log claims all blocks that contain immediate write data
1279 * so that the SPA knows they're in use.
1281 * All claims *must* be resolved in the first txg -- before the SPA
1282 * starts allocating blocks -- so that nothing is allocated twice.
1283 * If txg == 0 we just verify that the block is claimable.
1285 ASSERT3U(spa
->spa_uberblock
.ub_rootbp
.blk_birth
, <,
1286 spa_min_claim_txg(spa
));
1287 ASSERT(txg
== spa_min_claim_txg(spa
) || txg
== 0);
1288 ASSERT(!BP_GET_DEDUP(bp
) || !spa_writeable(spa
)); /* zdb(8) */
1290 zio
= zio_create(pio
, spa
, txg
, bp
, NULL
, BP_GET_PSIZE(bp
),
1291 BP_GET_PSIZE(bp
), done
, private, ZIO_TYPE_CLAIM
, ZIO_PRIORITY_NOW
,
1292 flags
, NULL
, 0, NULL
, ZIO_STAGE_OPEN
, ZIO_CLAIM_PIPELINE
);
1293 ASSERT0(zio
->io_queued_timestamp
);
1299 zio_ioctl(zio_t
*pio
, spa_t
*spa
, vdev_t
*vd
, int cmd
,
1300 zio_done_func_t
*done
, void *private, enum zio_flag flags
)
1305 if (vd
->vdev_children
== 0) {
1306 zio
= zio_create(pio
, spa
, 0, NULL
, NULL
, 0, 0, done
, private,
1307 ZIO_TYPE_IOCTL
, ZIO_PRIORITY_NOW
, flags
, vd
, 0, NULL
,
1308 ZIO_STAGE_OPEN
, ZIO_IOCTL_PIPELINE
);
1312 zio
= zio_null(pio
, spa
, NULL
, NULL
, NULL
, flags
);
1314 for (c
= 0; c
< vd
->vdev_children
; c
++)
1315 zio_nowait(zio_ioctl(zio
, spa
, vd
->vdev_child
[c
], cmd
,
1316 done
, private, flags
));
1323 zio_trim(zio_t
*pio
, vdev_t
*vd
, uint64_t offset
, uint64_t size
,
1324 zio_done_func_t
*done
, void *private, zio_priority_t priority
,
1325 enum zio_flag flags
, enum trim_flag trim_flags
)
1329 ASSERT0(vd
->vdev_children
);
1330 ASSERT0(P2PHASE(offset
, 1ULL << vd
->vdev_ashift
));
1331 ASSERT0(P2PHASE(size
, 1ULL << vd
->vdev_ashift
));
1332 ASSERT3U(size
, !=, 0);
1334 zio
= zio_create(pio
, vd
->vdev_spa
, 0, NULL
, NULL
, size
, size
, done
,
1335 private, ZIO_TYPE_TRIM
, priority
, flags
| ZIO_FLAG_PHYSICAL
,
1336 vd
, offset
, NULL
, ZIO_STAGE_OPEN
, ZIO_TRIM_PIPELINE
);
1337 zio
->io_trim_flags
= trim_flags
;
1343 zio_read_phys(zio_t
*pio
, vdev_t
*vd
, uint64_t offset
, uint64_t size
,
1344 abd_t
*data
, int checksum
, zio_done_func_t
*done
, void *private,
1345 zio_priority_t priority
, enum zio_flag flags
, boolean_t labels
)
1349 ASSERT(vd
->vdev_children
== 0);
1350 ASSERT(!labels
|| offset
+ size
<= VDEV_LABEL_START_SIZE
||
1351 offset
>= vd
->vdev_psize
- VDEV_LABEL_END_SIZE
);
1352 ASSERT3U(offset
+ size
, <=, vd
->vdev_psize
);
1354 zio
= zio_create(pio
, vd
->vdev_spa
, 0, NULL
, data
, size
, size
, done
,
1355 private, ZIO_TYPE_READ
, priority
, flags
| ZIO_FLAG_PHYSICAL
, vd
,
1356 offset
, NULL
, ZIO_STAGE_OPEN
, ZIO_READ_PHYS_PIPELINE
);
1358 zio
->io_prop
.zp_checksum
= checksum
;
1364 zio_write_phys(zio_t
*pio
, vdev_t
*vd
, uint64_t offset
, uint64_t size
,
1365 abd_t
*data
, int checksum
, zio_done_func_t
*done
, void *private,
1366 zio_priority_t priority
, enum zio_flag flags
, boolean_t labels
)
1370 ASSERT(vd
->vdev_children
== 0);
1371 ASSERT(!labels
|| offset
+ size
<= VDEV_LABEL_START_SIZE
||
1372 offset
>= vd
->vdev_psize
- VDEV_LABEL_END_SIZE
);
1373 ASSERT3U(offset
+ size
, <=, vd
->vdev_psize
);
1375 zio
= zio_create(pio
, vd
->vdev_spa
, 0, NULL
, data
, size
, size
, done
,
1376 private, ZIO_TYPE_WRITE
, priority
, flags
| ZIO_FLAG_PHYSICAL
, vd
,
1377 offset
, NULL
, ZIO_STAGE_OPEN
, ZIO_WRITE_PHYS_PIPELINE
);
1379 zio
->io_prop
.zp_checksum
= checksum
;
1381 if (zio_checksum_table
[checksum
].ci_flags
& ZCHECKSUM_FLAG_EMBEDDED
) {
1383 * zec checksums are necessarily destructive -- they modify
1384 * the end of the write buffer to hold the verifier/checksum.
1385 * Therefore, we must make a local copy in case the data is
1386 * being written to multiple places in parallel.
1388 abd_t
*wbuf
= abd_alloc_sametype(data
, size
);
1389 abd_copy(wbuf
, data
, size
);
1391 zio_push_transform(zio
, wbuf
, size
, size
, NULL
);
1398 * Create a child I/O to do some work for us.
1401 zio_vdev_child_io(zio_t
*pio
, blkptr_t
*bp
, vdev_t
*vd
, uint64_t offset
,
1402 abd_t
*data
, uint64_t size
, int type
, zio_priority_t priority
,
1403 enum zio_flag flags
, zio_done_func_t
*done
, void *private)
1405 enum zio_stage pipeline
= ZIO_VDEV_CHILD_PIPELINE
;
1409 * vdev child I/Os do not propagate their error to the parent.
1410 * Therefore, for correct operation the caller *must* check for
1411 * and handle the error in the child i/o's done callback.
1412 * The only exceptions are i/os that we don't care about
1413 * (OPTIONAL or REPAIR).
1415 ASSERT((flags
& ZIO_FLAG_OPTIONAL
) || (flags
& ZIO_FLAG_IO_REPAIR
) ||
1418 if (type
== ZIO_TYPE_READ
&& bp
!= NULL
) {
1420 * If we have the bp, then the child should perform the
1421 * checksum and the parent need not. This pushes error
1422 * detection as close to the leaves as possible and
1423 * eliminates redundant checksums in the interior nodes.
1425 pipeline
|= ZIO_STAGE_CHECKSUM_VERIFY
;
1426 pio
->io_pipeline
&= ~ZIO_STAGE_CHECKSUM_VERIFY
;
1429 if (vd
->vdev_ops
->vdev_op_leaf
) {
1430 ASSERT0(vd
->vdev_children
);
1431 offset
+= VDEV_LABEL_START_SIZE
;
1434 flags
|= ZIO_VDEV_CHILD_FLAGS(pio
);
1437 * If we've decided to do a repair, the write is not speculative --
1438 * even if the original read was.
1440 if (flags
& ZIO_FLAG_IO_REPAIR
)
1441 flags
&= ~ZIO_FLAG_SPECULATIVE
;
1444 * If we're creating a child I/O that is not associated with a
1445 * top-level vdev, then the child zio is not an allocating I/O.
1446 * If this is a retried I/O then we ignore it since we will
1447 * have already processed the original allocating I/O.
1449 if (flags
& ZIO_FLAG_IO_ALLOCATING
&&
1450 (vd
!= vd
->vdev_top
|| (flags
& ZIO_FLAG_IO_RETRY
))) {
1451 ASSERT(pio
->io_metaslab_class
!= NULL
);
1452 ASSERT(pio
->io_metaslab_class
->mc_alloc_throttle_enabled
);
1453 ASSERT(type
== ZIO_TYPE_WRITE
);
1454 ASSERT(priority
== ZIO_PRIORITY_ASYNC_WRITE
);
1455 ASSERT(!(flags
& ZIO_FLAG_IO_REPAIR
));
1456 ASSERT(!(pio
->io_flags
& ZIO_FLAG_IO_REWRITE
) ||
1457 pio
->io_child_type
== ZIO_CHILD_GANG
);
1459 flags
&= ~ZIO_FLAG_IO_ALLOCATING
;
1463 zio
= zio_create(pio
, pio
->io_spa
, pio
->io_txg
, bp
, data
, size
, size
,
1464 done
, private, type
, priority
, flags
, vd
, offset
, &pio
->io_bookmark
,
1465 ZIO_STAGE_VDEV_IO_START
>> 1, pipeline
);
1466 ASSERT3U(zio
->io_child_type
, ==, ZIO_CHILD_VDEV
);
1468 zio
->io_physdone
= pio
->io_physdone
;
1469 if (vd
->vdev_ops
->vdev_op_leaf
&& zio
->io_logical
!= NULL
)
1470 zio
->io_logical
->io_phys_children
++;
1476 zio_vdev_delegated_io(vdev_t
*vd
, uint64_t offset
, abd_t
*data
, uint64_t size
,
1477 zio_type_t type
, zio_priority_t priority
, enum zio_flag flags
,
1478 zio_done_func_t
*done
, void *private)
1482 ASSERT(vd
->vdev_ops
->vdev_op_leaf
);
1484 zio
= zio_create(NULL
, vd
->vdev_spa
, 0, NULL
,
1485 data
, size
, size
, done
, private, type
, priority
,
1486 flags
| ZIO_FLAG_CANFAIL
| ZIO_FLAG_DONT_RETRY
| ZIO_FLAG_DELEGATED
,
1488 ZIO_STAGE_VDEV_IO_START
>> 1, ZIO_VDEV_CHILD_PIPELINE
);
1494 zio_flush(zio_t
*zio
, vdev_t
*vd
)
1496 zio_nowait(zio_ioctl(zio
, zio
->io_spa
, vd
, DKIOCFLUSHWRITECACHE
,
1498 ZIO_FLAG_CANFAIL
| ZIO_FLAG_DONT_PROPAGATE
| ZIO_FLAG_DONT_RETRY
));
1502 zio_shrink(zio_t
*zio
, uint64_t size
)
1504 ASSERT3P(zio
->io_executor
, ==, NULL
);
1505 ASSERT3U(zio
->io_orig_size
, ==, zio
->io_size
);
1506 ASSERT3U(size
, <=, zio
->io_size
);
1509 * We don't shrink for raidz because of problems with the
1510 * reconstruction when reading back less than the block size.
1511 * Note, BP_IS_RAIDZ() assumes no compression.
1513 ASSERT(BP_GET_COMPRESS(zio
->io_bp
) == ZIO_COMPRESS_OFF
);
1514 if (!BP_IS_RAIDZ(zio
->io_bp
)) {
1515 /* we are not doing a raw write */
1516 ASSERT3U(zio
->io_size
, ==, zio
->io_lsize
);
1517 zio
->io_orig_size
= zio
->io_size
= zio
->io_lsize
= size
;
1522 * ==========================================================================
1523 * Prepare to read and write logical blocks
1524 * ==========================================================================
1528 zio_read_bp_init(zio_t
*zio
)
1530 blkptr_t
*bp
= zio
->io_bp
;
1532 BP_IS_EMBEDDED(bp
) ? BPE_GET_PSIZE(bp
) : BP_GET_PSIZE(bp
);
1534 ASSERT3P(zio
->io_bp
, ==, &zio
->io_bp_copy
);
1536 if (BP_GET_COMPRESS(bp
) != ZIO_COMPRESS_OFF
&&
1537 zio
->io_child_type
== ZIO_CHILD_LOGICAL
&&
1538 !(zio
->io_flags
& ZIO_FLAG_RAW_COMPRESS
)) {
1539 zio_push_transform(zio
, abd_alloc_sametype(zio
->io_abd
, psize
),
1540 psize
, psize
, zio_decompress
);
1543 if (((BP_IS_PROTECTED(bp
) && !(zio
->io_flags
& ZIO_FLAG_RAW_ENCRYPT
)) ||
1544 BP_HAS_INDIRECT_MAC_CKSUM(bp
)) &&
1545 zio
->io_child_type
== ZIO_CHILD_LOGICAL
) {
1546 zio_push_transform(zio
, abd_alloc_sametype(zio
->io_abd
, psize
),
1547 psize
, psize
, zio_decrypt
);
1550 if (BP_IS_EMBEDDED(bp
) && BPE_GET_ETYPE(bp
) == BP_EMBEDDED_TYPE_DATA
) {
1551 int psize
= BPE_GET_PSIZE(bp
);
1552 void *data
= abd_borrow_buf(zio
->io_abd
, psize
);
1554 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1555 decode_embedded_bp_compressed(bp
, data
);
1556 abd_return_buf_copy(zio
->io_abd
, data
, psize
);
1558 ASSERT(!BP_IS_EMBEDDED(bp
));
1559 ASSERT3P(zio
->io_bp
, ==, &zio
->io_bp_copy
);
1562 if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp
)) && BP_GET_LEVEL(bp
) == 0)
1563 zio
->io_flags
|= ZIO_FLAG_DONT_CACHE
;
1565 if (BP_GET_TYPE(bp
) == DMU_OT_DDT_ZAP
)
1566 zio
->io_flags
|= ZIO_FLAG_DONT_CACHE
;
1568 if (BP_GET_DEDUP(bp
) && zio
->io_child_type
== ZIO_CHILD_LOGICAL
)
1569 zio
->io_pipeline
= ZIO_DDT_READ_PIPELINE
;
1575 zio_write_bp_init(zio_t
*zio
)
1577 if (!IO_IS_ALLOCATING(zio
))
1580 ASSERT(zio
->io_child_type
!= ZIO_CHILD_DDT
);
1582 if (zio
->io_bp_override
) {
1583 blkptr_t
*bp
= zio
->io_bp
;
1584 zio_prop_t
*zp
= &zio
->io_prop
;
1586 ASSERT(bp
->blk_birth
!= zio
->io_txg
);
1587 ASSERT(BP_GET_DEDUP(zio
->io_bp_override
) == 0);
1589 *bp
= *zio
->io_bp_override
;
1590 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1592 if (BP_IS_EMBEDDED(bp
))
1596 * If we've been overridden and nopwrite is set then
1597 * set the flag accordingly to indicate that a nopwrite
1598 * has already occurred.
1600 if (!BP_IS_HOLE(bp
) && zp
->zp_nopwrite
) {
1601 ASSERT(!zp
->zp_dedup
);
1602 ASSERT3U(BP_GET_CHECKSUM(bp
), ==, zp
->zp_checksum
);
1603 zio
->io_flags
|= ZIO_FLAG_NOPWRITE
;
1607 ASSERT(!zp
->zp_nopwrite
);
1609 if (BP_IS_HOLE(bp
) || !zp
->zp_dedup
)
1612 ASSERT((zio_checksum_table
[zp
->zp_checksum
].ci_flags
&
1613 ZCHECKSUM_FLAG_DEDUP
) || zp
->zp_dedup_verify
);
1615 if (BP_GET_CHECKSUM(bp
) == zp
->zp_checksum
&&
1617 BP_SET_DEDUP(bp
, 1);
1618 zio
->io_pipeline
|= ZIO_STAGE_DDT_WRITE
;
1623 * We were unable to handle this as an override bp, treat
1624 * it as a regular write I/O.
1626 zio
->io_bp_override
= NULL
;
1627 *bp
= zio
->io_bp_orig
;
1628 zio
->io_pipeline
= zio
->io_orig_pipeline
;
1635 zio_write_compress(zio_t
*zio
)
1637 spa_t
*spa
= zio
->io_spa
;
1638 zio_prop_t
*zp
= &zio
->io_prop
;
1639 enum zio_compress compress
= zp
->zp_compress
;
1640 blkptr_t
*bp
= zio
->io_bp
;
1641 uint64_t lsize
= zio
->io_lsize
;
1642 uint64_t psize
= zio
->io_size
;
1646 * If our children haven't all reached the ready stage,
1647 * wait for them and then repeat this pipeline stage.
1649 if (zio_wait_for_children(zio
, ZIO_CHILD_LOGICAL_BIT
|
1650 ZIO_CHILD_GANG_BIT
, ZIO_WAIT_READY
)) {
1654 if (!IO_IS_ALLOCATING(zio
))
1657 if (zio
->io_children_ready
!= NULL
) {
1659 * Now that all our children are ready, run the callback
1660 * associated with this zio in case it wants to modify the
1661 * data to be written.
1663 ASSERT3U(zp
->zp_level
, >, 0);
1664 zio
->io_children_ready(zio
);
1667 ASSERT(zio
->io_child_type
!= ZIO_CHILD_DDT
);
1668 ASSERT(zio
->io_bp_override
== NULL
);
1670 if (!BP_IS_HOLE(bp
) && bp
->blk_birth
== zio
->io_txg
) {
1672 * We're rewriting an existing block, which means we're
1673 * working on behalf of spa_sync(). For spa_sync() to
1674 * converge, it must eventually be the case that we don't
1675 * have to allocate new blocks. But compression changes
1676 * the blocksize, which forces a reallocate, and makes
1677 * convergence take longer. Therefore, after the first
1678 * few passes, stop compressing to ensure convergence.
1680 pass
= spa_sync_pass(spa
);
1682 ASSERT(zio
->io_txg
== spa_syncing_txg(spa
));
1683 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1684 ASSERT(!BP_GET_DEDUP(bp
));
1686 if (pass
>= zfs_sync_pass_dont_compress
)
1687 compress
= ZIO_COMPRESS_OFF
;
1689 /* Make sure someone doesn't change their mind on overwrites */
1690 ASSERT(BP_IS_EMBEDDED(bp
) || MIN(zp
->zp_copies
+ BP_IS_GANG(bp
),
1691 spa_max_replication(spa
)) == BP_GET_NDVAS(bp
));
1694 /* If it's a compressed write that is not raw, compress the buffer. */
1695 if (compress
!= ZIO_COMPRESS_OFF
&&
1696 !(zio
->io_flags
& ZIO_FLAG_RAW_COMPRESS
)) {
1697 void *cbuf
= zio_buf_alloc(lsize
);
1698 psize
= zio_compress_data(compress
, zio
->io_abd
, cbuf
, lsize
,
1700 if (psize
== 0 || psize
>= lsize
) {
1701 compress
= ZIO_COMPRESS_OFF
;
1702 zio_buf_free(cbuf
, lsize
);
1703 } else if (!zp
->zp_dedup
&& !zp
->zp_encrypt
&&
1704 psize
<= BPE_PAYLOAD_SIZE
&&
1705 zp
->zp_level
== 0 && !DMU_OT_HAS_FILL(zp
->zp_type
) &&
1706 spa_feature_is_enabled(spa
, SPA_FEATURE_EMBEDDED_DATA
)) {
1707 encode_embedded_bp_compressed(bp
,
1708 cbuf
, compress
, lsize
, psize
);
1709 BPE_SET_ETYPE(bp
, BP_EMBEDDED_TYPE_DATA
);
1710 BP_SET_TYPE(bp
, zio
->io_prop
.zp_type
);
1711 BP_SET_LEVEL(bp
, zio
->io_prop
.zp_level
);
1712 zio_buf_free(cbuf
, lsize
);
1713 bp
->blk_birth
= zio
->io_txg
;
1714 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1715 ASSERT(spa_feature_is_active(spa
,
1716 SPA_FEATURE_EMBEDDED_DATA
));
1720 * Round compressed size up to the minimum allocation
1721 * size of the smallest-ashift device, and zero the
1722 * tail. This ensures that the compressed size of the
1723 * BP (and thus compressratio property) are correct,
1724 * in that we charge for the padding used to fill out
1727 ASSERT3U(spa
->spa_min_alloc
, >=, SPA_MINBLOCKSHIFT
);
1728 size_t rounded
= (size_t)roundup(psize
,
1729 spa
->spa_min_alloc
);
1730 if (rounded
>= lsize
) {
1731 compress
= ZIO_COMPRESS_OFF
;
1732 zio_buf_free(cbuf
, lsize
);
1735 abd_t
*cdata
= abd_get_from_buf(cbuf
, lsize
);
1736 abd_take_ownership_of_buf(cdata
, B_TRUE
);
1737 abd_zero_off(cdata
, psize
, rounded
- psize
);
1739 zio_push_transform(zio
, cdata
,
1740 psize
, lsize
, NULL
);
1745 * We were unable to handle this as an override bp, treat
1746 * it as a regular write I/O.
1748 zio
->io_bp_override
= NULL
;
1749 *bp
= zio
->io_bp_orig
;
1750 zio
->io_pipeline
= zio
->io_orig_pipeline
;
1752 } else if ((zio
->io_flags
& ZIO_FLAG_RAW_ENCRYPT
) != 0 &&
1753 zp
->zp_type
== DMU_OT_DNODE
) {
1755 * The DMU actually relies on the zio layer's compression
1756 * to free metadnode blocks that have had all contained
1757 * dnodes freed. As a result, even when doing a raw
1758 * receive, we must check whether the block can be compressed
1761 psize
= zio_compress_data(ZIO_COMPRESS_EMPTY
,
1762 zio
->io_abd
, NULL
, lsize
, zp
->zp_complevel
);
1763 if (psize
== 0 || psize
>= lsize
)
1764 compress
= ZIO_COMPRESS_OFF
;
1765 } else if (zio
->io_flags
& ZIO_FLAG_RAW_COMPRESS
&&
1766 !(zio
->io_flags
& ZIO_FLAG_RAW_ENCRYPT
)) {
1768 * If we are raw receiving an encrypted dataset we should not
1769 * take this codepath because it will change the on-disk block
1770 * and decryption will fail.
1772 size_t rounded
= MIN((size_t)roundup(psize
,
1773 spa
->spa_min_alloc
), lsize
);
1775 if (rounded
!= psize
) {
1776 abd_t
*cdata
= abd_alloc_linear(rounded
, B_TRUE
);
1777 abd_zero_off(cdata
, psize
, rounded
- psize
);
1778 abd_copy_off(cdata
, zio
->io_abd
, 0, 0, psize
);
1780 zio_push_transform(zio
, cdata
,
1781 psize
, rounded
, NULL
);
1784 ASSERT3U(psize
, !=, 0);
1788 * The final pass of spa_sync() must be all rewrites, but the first
1789 * few passes offer a trade-off: allocating blocks defers convergence,
1790 * but newly allocated blocks are sequential, so they can be written
1791 * to disk faster. Therefore, we allow the first few passes of
1792 * spa_sync() to allocate new blocks, but force rewrites after that.
1793 * There should only be a handful of blocks after pass 1 in any case.
1795 if (!BP_IS_HOLE(bp
) && bp
->blk_birth
== zio
->io_txg
&&
1796 BP_GET_PSIZE(bp
) == psize
&&
1797 pass
>= zfs_sync_pass_rewrite
) {
1798 VERIFY3U(psize
, !=, 0);
1799 enum zio_stage gang_stages
= zio
->io_pipeline
& ZIO_GANG_STAGES
;
1801 zio
->io_pipeline
= ZIO_REWRITE_PIPELINE
| gang_stages
;
1802 zio
->io_flags
|= ZIO_FLAG_IO_REWRITE
;
1805 zio
->io_pipeline
= ZIO_WRITE_PIPELINE
;
1809 if (zio
->io_bp_orig
.blk_birth
!= 0 &&
1810 spa_feature_is_active(spa
, SPA_FEATURE_HOLE_BIRTH
)) {
1811 BP_SET_LSIZE(bp
, lsize
);
1812 BP_SET_TYPE(bp
, zp
->zp_type
);
1813 BP_SET_LEVEL(bp
, zp
->zp_level
);
1814 BP_SET_BIRTH(bp
, zio
->io_txg
, 0);
1816 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1818 ASSERT(zp
->zp_checksum
!= ZIO_CHECKSUM_GANG_HEADER
);
1819 BP_SET_LSIZE(bp
, lsize
);
1820 BP_SET_TYPE(bp
, zp
->zp_type
);
1821 BP_SET_LEVEL(bp
, zp
->zp_level
);
1822 BP_SET_PSIZE(bp
, psize
);
1823 BP_SET_COMPRESS(bp
, compress
);
1824 BP_SET_CHECKSUM(bp
, zp
->zp_checksum
);
1825 BP_SET_DEDUP(bp
, zp
->zp_dedup
);
1826 BP_SET_BYTEORDER(bp
, ZFS_HOST_BYTEORDER
);
1828 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1829 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_REWRITE
));
1830 ASSERT(!zp
->zp_encrypt
||
1831 DMU_OT_IS_ENCRYPTED(zp
->zp_type
));
1832 zio
->io_pipeline
= ZIO_DDT_WRITE_PIPELINE
;
1834 if (zp
->zp_nopwrite
) {
1835 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1836 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_REWRITE
));
1837 zio
->io_pipeline
|= ZIO_STAGE_NOP_WRITE
;
1844 zio_free_bp_init(zio_t
*zio
)
1846 blkptr_t
*bp
= zio
->io_bp
;
1848 if (zio
->io_child_type
== ZIO_CHILD_LOGICAL
) {
1849 if (BP_GET_DEDUP(bp
))
1850 zio
->io_pipeline
= ZIO_DDT_FREE_PIPELINE
;
1853 ASSERT3P(zio
->io_bp
, ==, &zio
->io_bp_copy
);
1859 * ==========================================================================
1860 * Execute the I/O pipeline
1861 * ==========================================================================
1865 zio_taskq_dispatch(zio_t
*zio
, zio_taskq_type_t q
, boolean_t cutinline
)
1867 spa_t
*spa
= zio
->io_spa
;
1868 zio_type_t t
= zio
->io_type
;
1869 int flags
= (cutinline
? TQ_FRONT
: 0);
1872 * If we're a config writer or a probe, the normal issue and
1873 * interrupt threads may all be blocked waiting for the config lock.
1874 * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL.
1876 if (zio
->io_flags
& (ZIO_FLAG_CONFIG_WRITER
| ZIO_FLAG_PROBE
))
1880 * A similar issue exists for the L2ARC write thread until L2ARC 2.0.
1882 if (t
== ZIO_TYPE_WRITE
&& zio
->io_vd
&& zio
->io_vd
->vdev_aux
)
1886 * If this is a high priority I/O, then use the high priority taskq if
1889 if ((zio
->io_priority
== ZIO_PRIORITY_NOW
||
1890 zio
->io_priority
== ZIO_PRIORITY_SYNC_WRITE
) &&
1891 spa
->spa_zio_taskq
[t
][q
+ 1].stqs_count
!= 0)
1894 ASSERT3U(q
, <, ZIO_TASKQ_TYPES
);
1897 * NB: We are assuming that the zio can only be dispatched
1898 * to a single taskq at a time. It would be a grievous error
1899 * to dispatch the zio to another taskq at the same time.
1901 ASSERT(taskq_empty_ent(&zio
->io_tqent
));
1902 spa_taskq_dispatch_ent(spa
, t
, q
, zio_execute
, zio
, flags
,
1907 zio_taskq_member(zio_t
*zio
, zio_taskq_type_t q
)
1909 spa_t
*spa
= zio
->io_spa
;
1911 taskq_t
*tq
= taskq_of_curthread();
1913 for (zio_type_t t
= 0; t
< ZIO_TYPES
; t
++) {
1914 spa_taskqs_t
*tqs
= &spa
->spa_zio_taskq
[t
][q
];
1916 for (i
= 0; i
< tqs
->stqs_count
; i
++) {
1917 if (tqs
->stqs_taskq
[i
] == tq
)
1926 zio_issue_async(zio_t
*zio
)
1928 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, B_FALSE
);
1934 zio_interrupt(void *zio
)
1936 zio_taskq_dispatch(zio
, ZIO_TASKQ_INTERRUPT
, B_FALSE
);
1940 zio_delay_interrupt(zio_t
*zio
)
1943 * The timeout_generic() function isn't defined in userspace, so
1944 * rather than trying to implement the function, the zio delay
1945 * functionality has been disabled for userspace builds.
1950 * If io_target_timestamp is zero, then no delay has been registered
1951 * for this IO, thus jump to the end of this function and "skip" the
1952 * delay; issuing it directly to the zio layer.
1954 if (zio
->io_target_timestamp
!= 0) {
1955 hrtime_t now
= gethrtime();
1957 if (now
>= zio
->io_target_timestamp
) {
1959 * This IO has already taken longer than the target
1960 * delay to complete, so we don't want to delay it
1961 * any longer; we "miss" the delay and issue it
1962 * directly to the zio layer. This is likely due to
1963 * the target latency being set to a value less than
1964 * the underlying hardware can satisfy (e.g. delay
1965 * set to 1ms, but the disks take 10ms to complete an
1969 DTRACE_PROBE2(zio__delay__miss
, zio_t
*, zio
,
1975 hrtime_t diff
= zio
->io_target_timestamp
- now
;
1976 clock_t expire_at_tick
= ddi_get_lbolt() +
1979 DTRACE_PROBE3(zio__delay__hit
, zio_t
*, zio
,
1980 hrtime_t
, now
, hrtime_t
, diff
);
1982 if (NSEC_TO_TICK(diff
) == 0) {
1983 /* Our delay is less than a jiffy - just spin */
1984 zfs_sleep_until(zio
->io_target_timestamp
);
1988 * Use taskq_dispatch_delay() in the place of
1989 * OpenZFS's timeout_generic().
1991 tid
= taskq_dispatch_delay(system_taskq
,
1992 zio_interrupt
, zio
, TQ_NOSLEEP
,
1994 if (tid
== TASKQID_INVALID
) {
1996 * Couldn't allocate a task. Just
1997 * finish the zio without a delay.
2006 DTRACE_PROBE1(zio__delay__skip
, zio_t
*, zio
);
2011 zio_deadman_impl(zio_t
*pio
, int ziodepth
)
2013 zio_t
*cio
, *cio_next
;
2014 zio_link_t
*zl
= NULL
;
2015 vdev_t
*vd
= pio
->io_vd
;
2017 if (zio_deadman_log_all
|| (vd
!= NULL
&& vd
->vdev_ops
->vdev_op_leaf
)) {
2018 vdev_queue_t
*vq
= vd
? &vd
->vdev_queue
: NULL
;
2019 zbookmark_phys_t
*zb
= &pio
->io_bookmark
;
2020 uint64_t delta
= gethrtime() - pio
->io_timestamp
;
2021 uint64_t failmode
= spa_get_deadman_failmode(pio
->io_spa
);
2023 zfs_dbgmsg("slow zio[%d]: zio=%px timestamp=%llu "
2024 "delta=%llu queued=%llu io=%llu "
2026 "last=%llu type=%d "
2027 "priority=%d flags=0x%x stage=0x%x "
2028 "pipeline=0x%x pipeline-trace=0x%x "
2029 "objset=%llu object=%llu "
2030 "level=%llu blkid=%llu "
2031 "offset=%llu size=%llu "
2033 ziodepth
, pio
, pio
->io_timestamp
,
2034 (u_longlong_t
)delta
, pio
->io_delta
, pio
->io_delay
,
2035 vd
? vd
->vdev_path
: "NULL",
2036 vq
? vq
->vq_io_complete_ts
: 0, pio
->io_type
,
2037 pio
->io_priority
, pio
->io_flags
, pio
->io_stage
,
2038 pio
->io_pipeline
, pio
->io_pipeline_trace
,
2039 (u_longlong_t
)zb
->zb_objset
, (u_longlong_t
)zb
->zb_object
,
2040 (u_longlong_t
)zb
->zb_level
, (u_longlong_t
)zb
->zb_blkid
,
2041 (u_longlong_t
)pio
->io_offset
, (u_longlong_t
)pio
->io_size
,
2043 (void) zfs_ereport_post(FM_EREPORT_ZFS_DEADMAN
,
2044 pio
->io_spa
, vd
, zb
, pio
, 0);
2046 if (failmode
== ZIO_FAILURE_MODE_CONTINUE
&&
2047 taskq_empty_ent(&pio
->io_tqent
)) {
2052 mutex_enter(&pio
->io_lock
);
2053 for (cio
= zio_walk_children(pio
, &zl
); cio
!= NULL
; cio
= cio_next
) {
2054 cio_next
= zio_walk_children(pio
, &zl
);
2055 zio_deadman_impl(cio
, ziodepth
+ 1);
2057 mutex_exit(&pio
->io_lock
);
2061 * Log the critical information describing this zio and all of its children
2062 * using the zfs_dbgmsg() interface then post deadman event for the ZED.
2065 zio_deadman(zio_t
*pio
, const char *tag
)
2067 spa_t
*spa
= pio
->io_spa
;
2068 char *name
= spa_name(spa
);
2070 if (!zfs_deadman_enabled
|| spa_suspended(spa
))
2073 zio_deadman_impl(pio
, 0);
2075 switch (spa_get_deadman_failmode(spa
)) {
2076 case ZIO_FAILURE_MODE_WAIT
:
2077 zfs_dbgmsg("%s waiting for hung I/O to pool '%s'", tag
, name
);
2080 case ZIO_FAILURE_MODE_CONTINUE
:
2081 zfs_dbgmsg("%s restarting hung I/O for pool '%s'", tag
, name
);
2084 case ZIO_FAILURE_MODE_PANIC
:
2085 fm_panic("%s determined I/O to pool '%s' is hung.", tag
, name
);
2091 * Execute the I/O pipeline until one of the following occurs:
2092 * (1) the I/O completes; (2) the pipeline stalls waiting for
2093 * dependent child I/Os; (3) the I/O issues, so we're waiting
2094 * for an I/O completion interrupt; (4) the I/O is delegated by
2095 * vdev-level caching or aggregation; (5) the I/O is deferred
2096 * due to vdev-level queueing; (6) the I/O is handed off to
2097 * another thread. In all cases, the pipeline stops whenever
2098 * there's no CPU work; it never burns a thread in cv_wait_io().
2100 * There's no locking on io_stage because there's no legitimate way
2101 * for multiple threads to be attempting to process the same I/O.
2103 static zio_pipe_stage_t
*zio_pipeline
[];
2106 * zio_execute() is a wrapper around the static function
2107 * __zio_execute() so that we can force __zio_execute() to be
2108 * inlined. This reduces stack overhead which is important
2109 * because __zio_execute() is called recursively in several zio
2110 * code paths. zio_execute() itself cannot be inlined because
2111 * it is externally visible.
2114 zio_execute(void *zio
)
2116 fstrans_cookie_t cookie
;
2118 cookie
= spl_fstrans_mark();
2120 spl_fstrans_unmark(cookie
);
2124 * Used to determine if in the current context the stack is sized large
2125 * enough to allow zio_execute() to be called recursively. A minimum
2126 * stack size of 16K is required to avoid needing to re-dispatch the zio.
2129 zio_execute_stack_check(zio_t
*zio
)
2131 #if !defined(HAVE_LARGE_STACKS)
2132 dsl_pool_t
*dp
= spa_get_dsl(zio
->io_spa
);
2134 /* Executing in txg_sync_thread() context. */
2135 if (dp
&& curthread
== dp
->dp_tx
.tx_sync_thread
)
2138 /* Pool initialization outside of zio_taskq context. */
2139 if (dp
&& spa_is_initializing(dp
->dp_spa
) &&
2140 !zio_taskq_member(zio
, ZIO_TASKQ_ISSUE
) &&
2141 !zio_taskq_member(zio
, ZIO_TASKQ_ISSUE_HIGH
))
2145 #endif /* HAVE_LARGE_STACKS */
2150 __attribute__((always_inline
))
2152 __zio_execute(zio_t
*zio
)
2154 ASSERT3U(zio
->io_queued_timestamp
, >, 0);
2156 while (zio
->io_stage
< ZIO_STAGE_DONE
) {
2157 enum zio_stage pipeline
= zio
->io_pipeline
;
2158 enum zio_stage stage
= zio
->io_stage
;
2160 zio
->io_executor
= curthread
;
2162 ASSERT(!MUTEX_HELD(&zio
->io_lock
));
2163 ASSERT(ISP2(stage
));
2164 ASSERT(zio
->io_stall
== NULL
);
2168 } while ((stage
& pipeline
) == 0);
2170 ASSERT(stage
<= ZIO_STAGE_DONE
);
2173 * If we are in interrupt context and this pipeline stage
2174 * will grab a config lock that is held across I/O,
2175 * or may wait for an I/O that needs an interrupt thread
2176 * to complete, issue async to avoid deadlock.
2178 * For VDEV_IO_START, we cut in line so that the io will
2179 * be sent to disk promptly.
2181 if ((stage
& ZIO_BLOCKING_STAGES
) && zio
->io_vd
== NULL
&&
2182 zio_taskq_member(zio
, ZIO_TASKQ_INTERRUPT
)) {
2183 boolean_t cut
= (stage
== ZIO_STAGE_VDEV_IO_START
) ?
2184 zio_requeue_io_start_cut_in_line
: B_FALSE
;
2185 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, cut
);
2190 * If the current context doesn't have large enough stacks
2191 * the zio must be issued asynchronously to prevent overflow.
2193 if (zio_execute_stack_check(zio
)) {
2194 boolean_t cut
= (stage
== ZIO_STAGE_VDEV_IO_START
) ?
2195 zio_requeue_io_start_cut_in_line
: B_FALSE
;
2196 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, cut
);
2200 zio
->io_stage
= stage
;
2201 zio
->io_pipeline_trace
|= zio
->io_stage
;
2204 * The zio pipeline stage returns the next zio to execute
2205 * (typically the same as this one), or NULL if we should
2208 zio
= zio_pipeline
[highbit64(stage
) - 1](zio
);
2217 * ==========================================================================
2218 * Initiate I/O, either sync or async
2219 * ==========================================================================
2222 zio_wait(zio_t
*zio
)
2225 * Some routines, like zio_free_sync(), may return a NULL zio
2226 * to avoid the performance overhead of creating and then destroying
2227 * an unneeded zio. For the callers' simplicity, we accept a NULL
2228 * zio and ignore it.
2233 long timeout
= MSEC_TO_TICK(zfs_deadman_ziotime_ms
);
2236 ASSERT3S(zio
->io_stage
, ==, ZIO_STAGE_OPEN
);
2237 ASSERT3P(zio
->io_executor
, ==, NULL
);
2239 zio
->io_waiter
= curthread
;
2240 ASSERT0(zio
->io_queued_timestamp
);
2241 zio
->io_queued_timestamp
= gethrtime();
2245 mutex_enter(&zio
->io_lock
);
2246 while (zio
->io_executor
!= NULL
) {
2247 error
= cv_timedwait_io(&zio
->io_cv
, &zio
->io_lock
,
2248 ddi_get_lbolt() + timeout
);
2250 if (zfs_deadman_enabled
&& error
== -1 &&
2251 gethrtime() - zio
->io_queued_timestamp
>
2252 spa_deadman_ziotime(zio
->io_spa
)) {
2253 mutex_exit(&zio
->io_lock
);
2254 timeout
= MSEC_TO_TICK(zfs_deadman_checktime_ms
);
2255 zio_deadman(zio
, FTAG
);
2256 mutex_enter(&zio
->io_lock
);
2259 mutex_exit(&zio
->io_lock
);
2261 error
= zio
->io_error
;
2268 zio_nowait(zio_t
*zio
)
2271 * See comment in zio_wait().
2276 ASSERT3P(zio
->io_executor
, ==, NULL
);
2278 if (zio
->io_child_type
== ZIO_CHILD_LOGICAL
&&
2279 zio_unique_parent(zio
) == NULL
) {
2283 * This is a logical async I/O with no parent to wait for it.
2284 * We add it to the spa_async_root_zio "Godfather" I/O which
2285 * will ensure they complete prior to unloading the pool.
2287 spa_t
*spa
= zio
->io_spa
;
2288 pio
= spa
->spa_async_zio_root
[CPU_SEQID_UNSTABLE
];
2290 zio_add_child(pio
, zio
);
2293 ASSERT0(zio
->io_queued_timestamp
);
2294 zio
->io_queued_timestamp
= gethrtime();
2299 * ==========================================================================
2300 * Reexecute, cancel, or suspend/resume failed I/O
2301 * ==========================================================================
2305 zio_reexecute(void *arg
)
2308 zio_t
*cio
, *cio_next
;
2310 ASSERT(pio
->io_child_type
== ZIO_CHILD_LOGICAL
);
2311 ASSERT(pio
->io_orig_stage
== ZIO_STAGE_OPEN
);
2312 ASSERT(pio
->io_gang_leader
== NULL
);
2313 ASSERT(pio
->io_gang_tree
== NULL
);
2315 pio
->io_flags
= pio
->io_orig_flags
;
2316 pio
->io_stage
= pio
->io_orig_stage
;
2317 pio
->io_pipeline
= pio
->io_orig_pipeline
;
2318 pio
->io_reexecute
= 0;
2319 pio
->io_flags
|= ZIO_FLAG_REEXECUTED
;
2320 pio
->io_pipeline_trace
= 0;
2322 for (int w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
2323 pio
->io_state
[w
] = 0;
2324 for (int c
= 0; c
< ZIO_CHILD_TYPES
; c
++)
2325 pio
->io_child_error
[c
] = 0;
2327 if (IO_IS_ALLOCATING(pio
))
2328 BP_ZERO(pio
->io_bp
);
2331 * As we reexecute pio's children, new children could be created.
2332 * New children go to the head of pio's io_child_list, however,
2333 * so we will (correctly) not reexecute them. The key is that
2334 * the remainder of pio's io_child_list, from 'cio_next' onward,
2335 * cannot be affected by any side effects of reexecuting 'cio'.
2337 zio_link_t
*zl
= NULL
;
2338 mutex_enter(&pio
->io_lock
);
2339 for (cio
= zio_walk_children(pio
, &zl
); cio
!= NULL
; cio
= cio_next
) {
2340 cio_next
= zio_walk_children(pio
, &zl
);
2341 for (int w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
2342 pio
->io_children
[cio
->io_child_type
][w
]++;
2343 mutex_exit(&pio
->io_lock
);
2345 mutex_enter(&pio
->io_lock
);
2347 mutex_exit(&pio
->io_lock
);
2350 * Now that all children have been reexecuted, execute the parent.
2351 * We don't reexecute "The Godfather" I/O here as it's the
2352 * responsibility of the caller to wait on it.
2354 if (!(pio
->io_flags
& ZIO_FLAG_GODFATHER
)) {
2355 pio
->io_queued_timestamp
= gethrtime();
2361 zio_suspend(spa_t
*spa
, zio_t
*zio
, zio_suspend_reason_t reason
)
2363 if (spa_get_failmode(spa
) == ZIO_FAILURE_MODE_PANIC
)
2364 fm_panic("Pool '%s' has encountered an uncorrectable I/O "
2365 "failure and the failure mode property for this pool "
2366 "is set to panic.", spa_name(spa
));
2368 cmn_err(CE_WARN
, "Pool '%s' has encountered an uncorrectable I/O "
2369 "failure and has been suspended.\n", spa_name(spa
));
2371 (void) zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE
, spa
, NULL
,
2374 mutex_enter(&spa
->spa_suspend_lock
);
2376 if (spa
->spa_suspend_zio_root
== NULL
)
2377 spa
->spa_suspend_zio_root
= zio_root(spa
, NULL
, NULL
,
2378 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
|
2379 ZIO_FLAG_GODFATHER
);
2381 spa
->spa_suspended
= reason
;
2384 ASSERT(!(zio
->io_flags
& ZIO_FLAG_GODFATHER
));
2385 ASSERT(zio
!= spa
->spa_suspend_zio_root
);
2386 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
2387 ASSERT(zio_unique_parent(zio
) == NULL
);
2388 ASSERT(zio
->io_stage
== ZIO_STAGE_DONE
);
2389 zio_add_child(spa
->spa_suspend_zio_root
, zio
);
2392 mutex_exit(&spa
->spa_suspend_lock
);
2396 zio_resume(spa_t
*spa
)
2401 * Reexecute all previously suspended i/o.
2403 mutex_enter(&spa
->spa_suspend_lock
);
2404 spa
->spa_suspended
= ZIO_SUSPEND_NONE
;
2405 cv_broadcast(&spa
->spa_suspend_cv
);
2406 pio
= spa
->spa_suspend_zio_root
;
2407 spa
->spa_suspend_zio_root
= NULL
;
2408 mutex_exit(&spa
->spa_suspend_lock
);
2414 return (zio_wait(pio
));
2418 zio_resume_wait(spa_t
*spa
)
2420 mutex_enter(&spa
->spa_suspend_lock
);
2421 while (spa_suspended(spa
))
2422 cv_wait(&spa
->spa_suspend_cv
, &spa
->spa_suspend_lock
);
2423 mutex_exit(&spa
->spa_suspend_lock
);
2427 * ==========================================================================
2430 * A gang block is a collection of small blocks that looks to the DMU
2431 * like one large block. When zio_dva_allocate() cannot find a block
2432 * of the requested size, due to either severe fragmentation or the pool
2433 * being nearly full, it calls zio_write_gang_block() to construct the
2434 * block from smaller fragments.
2436 * A gang block consists of a gang header (zio_gbh_phys_t) and up to
2437 * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like
2438 * an indirect block: it's an array of block pointers. It consumes
2439 * only one sector and hence is allocatable regardless of fragmentation.
2440 * The gang header's bps point to its gang members, which hold the data.
2442 * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg>
2443 * as the verifier to ensure uniqueness of the SHA256 checksum.
2444 * Critically, the gang block bp's blk_cksum is the checksum of the data,
2445 * not the gang header. This ensures that data block signatures (needed for
2446 * deduplication) are independent of how the block is physically stored.
2448 * Gang blocks can be nested: a gang member may itself be a gang block.
2449 * Thus every gang block is a tree in which root and all interior nodes are
2450 * gang headers, and the leaves are normal blocks that contain user data.
2451 * The root of the gang tree is called the gang leader.
2453 * To perform any operation (read, rewrite, free, claim) on a gang block,
2454 * zio_gang_assemble() first assembles the gang tree (minus data leaves)
2455 * in the io_gang_tree field of the original logical i/o by recursively
2456 * reading the gang leader and all gang headers below it. This yields
2457 * an in-core tree containing the contents of every gang header and the
2458 * bps for every constituent of the gang block.
2460 * With the gang tree now assembled, zio_gang_issue() just walks the gang tree
2461 * and invokes a callback on each bp. To free a gang block, zio_gang_issue()
2462 * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp.
2463 * zio_claim_gang() provides a similarly trivial wrapper for zio_claim().
2464 * zio_read_gang() is a wrapper around zio_read() that omits reading gang
2465 * headers, since we already have those in io_gang_tree. zio_rewrite_gang()
2466 * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite()
2467 * of the gang header plus zio_checksum_compute() of the data to update the
2468 * gang header's blk_cksum as described above.
2470 * The two-phase assemble/issue model solves the problem of partial failure --
2471 * what if you'd freed part of a gang block but then couldn't read the
2472 * gang header for another part? Assembling the entire gang tree first
2473 * ensures that all the necessary gang header I/O has succeeded before
2474 * starting the actual work of free, claim, or write. Once the gang tree
2475 * is assembled, free and claim are in-memory operations that cannot fail.
2477 * In the event that a gang write fails, zio_dva_unallocate() walks the
2478 * gang tree to immediately free (i.e. insert back into the space map)
2479 * everything we've allocated. This ensures that we don't get ENOSPC
2480 * errors during repeated suspend/resume cycles due to a flaky device.
2482 * Gang rewrites only happen during sync-to-convergence. If we can't assemble
2483 * the gang tree, we won't modify the block, so we can safely defer the free
2484 * (knowing that the block is still intact). If we *can* assemble the gang
2485 * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free
2486 * each constituent bp and we can allocate a new block on the next sync pass.
2488 * In all cases, the gang tree allows complete recovery from partial failure.
2489 * ==========================================================================
2493 zio_gang_issue_func_done(zio_t
*zio
)
2495 abd_free(zio
->io_abd
);
2499 zio_read_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, abd_t
*data
,
2505 return (zio_read(pio
, pio
->io_spa
, bp
, abd_get_offset(data
, offset
),
2506 BP_GET_PSIZE(bp
), zio_gang_issue_func_done
,
2507 NULL
, pio
->io_priority
, ZIO_GANG_CHILD_FLAGS(pio
),
2508 &pio
->io_bookmark
));
2512 zio_rewrite_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, abd_t
*data
,
2519 abd_get_from_buf(gn
->gn_gbh
, SPA_GANGBLOCKSIZE
);
2520 zio
= zio_rewrite(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
2521 gbh_abd
, SPA_GANGBLOCKSIZE
, zio_gang_issue_func_done
, NULL
,
2522 pio
->io_priority
, ZIO_GANG_CHILD_FLAGS(pio
),
2525 * As we rewrite each gang header, the pipeline will compute
2526 * a new gang block header checksum for it; but no one will
2527 * compute a new data checksum, so we do that here. The one
2528 * exception is the gang leader: the pipeline already computed
2529 * its data checksum because that stage precedes gang assembly.
2530 * (Presently, nothing actually uses interior data checksums;
2531 * this is just good hygiene.)
2533 if (gn
!= pio
->io_gang_leader
->io_gang_tree
) {
2534 abd_t
*buf
= abd_get_offset(data
, offset
);
2536 zio_checksum_compute(zio
, BP_GET_CHECKSUM(bp
),
2537 buf
, BP_GET_PSIZE(bp
));
2542 * If we are here to damage data for testing purposes,
2543 * leave the GBH alone so that we can detect the damage.
2545 if (pio
->io_gang_leader
->io_flags
& ZIO_FLAG_INDUCE_DAMAGE
)
2546 zio
->io_pipeline
&= ~ZIO_VDEV_IO_STAGES
;
2548 zio
= zio_rewrite(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
2549 abd_get_offset(data
, offset
), BP_GET_PSIZE(bp
),
2550 zio_gang_issue_func_done
, NULL
, pio
->io_priority
,
2551 ZIO_GANG_CHILD_FLAGS(pio
), &pio
->io_bookmark
);
2558 zio_free_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, abd_t
*data
,
2561 (void) gn
, (void) data
, (void) offset
;
2563 zio_t
*zio
= zio_free_sync(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
2564 ZIO_GANG_CHILD_FLAGS(pio
));
2566 zio
= zio_null(pio
, pio
->io_spa
,
2567 NULL
, NULL
, NULL
, ZIO_GANG_CHILD_FLAGS(pio
));
2573 zio_claim_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, abd_t
*data
,
2576 (void) gn
, (void) data
, (void) offset
;
2577 return (zio_claim(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
2578 NULL
, NULL
, ZIO_GANG_CHILD_FLAGS(pio
)));
2581 static zio_gang_issue_func_t
*zio_gang_issue_func
[ZIO_TYPES
] = {
2590 static void zio_gang_tree_assemble_done(zio_t
*zio
);
2592 static zio_gang_node_t
*
2593 zio_gang_node_alloc(zio_gang_node_t
**gnpp
)
2595 zio_gang_node_t
*gn
;
2597 ASSERT(*gnpp
== NULL
);
2599 gn
= kmem_zalloc(sizeof (*gn
), KM_SLEEP
);
2600 gn
->gn_gbh
= zio_buf_alloc(SPA_GANGBLOCKSIZE
);
2607 zio_gang_node_free(zio_gang_node_t
**gnpp
)
2609 zio_gang_node_t
*gn
= *gnpp
;
2611 for (int g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++)
2612 ASSERT(gn
->gn_child
[g
] == NULL
);
2614 zio_buf_free(gn
->gn_gbh
, SPA_GANGBLOCKSIZE
);
2615 kmem_free(gn
, sizeof (*gn
));
2620 zio_gang_tree_free(zio_gang_node_t
**gnpp
)
2622 zio_gang_node_t
*gn
= *gnpp
;
2627 for (int g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++)
2628 zio_gang_tree_free(&gn
->gn_child
[g
]);
2630 zio_gang_node_free(gnpp
);
2634 zio_gang_tree_assemble(zio_t
*gio
, blkptr_t
*bp
, zio_gang_node_t
**gnpp
)
2636 zio_gang_node_t
*gn
= zio_gang_node_alloc(gnpp
);
2637 abd_t
*gbh_abd
= abd_get_from_buf(gn
->gn_gbh
, SPA_GANGBLOCKSIZE
);
2639 ASSERT(gio
->io_gang_leader
== gio
);
2640 ASSERT(BP_IS_GANG(bp
));
2642 zio_nowait(zio_read(gio
, gio
->io_spa
, bp
, gbh_abd
, SPA_GANGBLOCKSIZE
,
2643 zio_gang_tree_assemble_done
, gn
, gio
->io_priority
,
2644 ZIO_GANG_CHILD_FLAGS(gio
), &gio
->io_bookmark
));
2648 zio_gang_tree_assemble_done(zio_t
*zio
)
2650 zio_t
*gio
= zio
->io_gang_leader
;
2651 zio_gang_node_t
*gn
= zio
->io_private
;
2652 blkptr_t
*bp
= zio
->io_bp
;
2654 ASSERT(gio
== zio_unique_parent(zio
));
2655 ASSERT(zio
->io_child_count
== 0);
2660 /* this ABD was created from a linear buf in zio_gang_tree_assemble */
2661 if (BP_SHOULD_BYTESWAP(bp
))
2662 byteswap_uint64_array(abd_to_buf(zio
->io_abd
), zio
->io_size
);
2664 ASSERT3P(abd_to_buf(zio
->io_abd
), ==, gn
->gn_gbh
);
2665 ASSERT(zio
->io_size
== SPA_GANGBLOCKSIZE
);
2666 ASSERT(gn
->gn_gbh
->zg_tail
.zec_magic
== ZEC_MAGIC
);
2668 abd_free(zio
->io_abd
);
2670 for (int g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++) {
2671 blkptr_t
*gbp
= &gn
->gn_gbh
->zg_blkptr
[g
];
2672 if (!BP_IS_GANG(gbp
))
2674 zio_gang_tree_assemble(gio
, gbp
, &gn
->gn_child
[g
]);
2679 zio_gang_tree_issue(zio_t
*pio
, zio_gang_node_t
*gn
, blkptr_t
*bp
, abd_t
*data
,
2682 zio_t
*gio
= pio
->io_gang_leader
;
2685 ASSERT(BP_IS_GANG(bp
) == !!gn
);
2686 ASSERT(BP_GET_CHECKSUM(bp
) == BP_GET_CHECKSUM(gio
->io_bp
));
2687 ASSERT(BP_GET_LSIZE(bp
) == BP_GET_PSIZE(bp
) || gn
== gio
->io_gang_tree
);
2690 * If you're a gang header, your data is in gn->gn_gbh.
2691 * If you're a gang member, your data is in 'data' and gn == NULL.
2693 zio
= zio_gang_issue_func
[gio
->io_type
](pio
, bp
, gn
, data
, offset
);
2696 ASSERT(gn
->gn_gbh
->zg_tail
.zec_magic
== ZEC_MAGIC
);
2698 for (int g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++) {
2699 blkptr_t
*gbp
= &gn
->gn_gbh
->zg_blkptr
[g
];
2700 if (BP_IS_HOLE(gbp
))
2702 zio_gang_tree_issue(zio
, gn
->gn_child
[g
], gbp
, data
,
2704 offset
+= BP_GET_PSIZE(gbp
);
2708 if (gn
== gio
->io_gang_tree
)
2709 ASSERT3U(gio
->io_size
, ==, offset
);
2716 zio_gang_assemble(zio_t
*zio
)
2718 blkptr_t
*bp
= zio
->io_bp
;
2720 ASSERT(BP_IS_GANG(bp
) && zio
->io_gang_leader
== NULL
);
2721 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
2723 zio
->io_gang_leader
= zio
;
2725 zio_gang_tree_assemble(zio
, bp
, &zio
->io_gang_tree
);
2731 zio_gang_issue(zio_t
*zio
)
2733 blkptr_t
*bp
= zio
->io_bp
;
2735 if (zio_wait_for_children(zio
, ZIO_CHILD_GANG_BIT
, ZIO_WAIT_DONE
)) {
2739 ASSERT(BP_IS_GANG(bp
) && zio
->io_gang_leader
== zio
);
2740 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
2742 if (zio
->io_child_error
[ZIO_CHILD_GANG
] == 0)
2743 zio_gang_tree_issue(zio
, zio
->io_gang_tree
, bp
, zio
->io_abd
,
2746 zio_gang_tree_free(&zio
->io_gang_tree
);
2748 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
2754 zio_write_gang_member_ready(zio_t
*zio
)
2756 zio_t
*pio
= zio_unique_parent(zio
);
2757 dva_t
*cdva
= zio
->io_bp
->blk_dva
;
2758 dva_t
*pdva
= pio
->io_bp
->blk_dva
;
2760 zio_t
*gio __maybe_unused
= zio
->io_gang_leader
;
2762 if (BP_IS_HOLE(zio
->io_bp
))
2765 ASSERT(BP_IS_HOLE(&zio
->io_bp_orig
));
2767 ASSERT(zio
->io_child_type
== ZIO_CHILD_GANG
);
2768 ASSERT3U(zio
->io_prop
.zp_copies
, ==, gio
->io_prop
.zp_copies
);
2769 ASSERT3U(zio
->io_prop
.zp_copies
, <=, BP_GET_NDVAS(zio
->io_bp
));
2770 ASSERT3U(pio
->io_prop
.zp_copies
, <=, BP_GET_NDVAS(pio
->io_bp
));
2771 ASSERT3U(BP_GET_NDVAS(zio
->io_bp
), <=, BP_GET_NDVAS(pio
->io_bp
));
2773 mutex_enter(&pio
->io_lock
);
2774 for (int d
= 0; d
< BP_GET_NDVAS(zio
->io_bp
); d
++) {
2775 ASSERT(DVA_GET_GANG(&pdva
[d
]));
2776 asize
= DVA_GET_ASIZE(&pdva
[d
]);
2777 asize
+= DVA_GET_ASIZE(&cdva
[d
]);
2778 DVA_SET_ASIZE(&pdva
[d
], asize
);
2780 mutex_exit(&pio
->io_lock
);
2784 zio_write_gang_done(zio_t
*zio
)
2787 * The io_abd field will be NULL for a zio with no data. The io_flags
2788 * will initially have the ZIO_FLAG_NODATA bit flag set, but we can't
2789 * check for it here as it is cleared in zio_ready.
2791 if (zio
->io_abd
!= NULL
)
2792 abd_free(zio
->io_abd
);
2796 zio_write_gang_block(zio_t
*pio
, metaslab_class_t
*mc
)
2798 spa_t
*spa
= pio
->io_spa
;
2799 blkptr_t
*bp
= pio
->io_bp
;
2800 zio_t
*gio
= pio
->io_gang_leader
;
2802 zio_gang_node_t
*gn
, **gnpp
;
2803 zio_gbh_phys_t
*gbh
;
2805 uint64_t txg
= pio
->io_txg
;
2806 uint64_t resid
= pio
->io_size
;
2808 int copies
= gio
->io_prop
.zp_copies
;
2812 boolean_t has_data
= !(pio
->io_flags
& ZIO_FLAG_NODATA
);
2815 * encrypted blocks need DVA[2] free so encrypted gang headers can't
2816 * have a third copy.
2818 gbh_copies
= MIN(copies
+ 1, spa_max_replication(spa
));
2819 if (gio
->io_prop
.zp_encrypt
&& gbh_copies
>= SPA_DVAS_PER_BP
)
2820 gbh_copies
= SPA_DVAS_PER_BP
- 1;
2822 int flags
= METASLAB_HINTBP_FAVOR
| METASLAB_GANG_HEADER
;
2823 if (pio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
) {
2824 ASSERT(pio
->io_priority
== ZIO_PRIORITY_ASYNC_WRITE
);
2827 flags
|= METASLAB_ASYNC_ALLOC
;
2828 VERIFY(zfs_refcount_held(&mc
->mc_allocator
[pio
->io_allocator
].
2829 mca_alloc_slots
, pio
));
2832 * The logical zio has already placed a reservation for
2833 * 'copies' allocation slots but gang blocks may require
2834 * additional copies. These additional copies
2835 * (i.e. gbh_copies - copies) are guaranteed to succeed
2836 * since metaslab_class_throttle_reserve() always allows
2837 * additional reservations for gang blocks.
2839 VERIFY(metaslab_class_throttle_reserve(mc
, gbh_copies
- copies
,
2840 pio
->io_allocator
, pio
, flags
));
2843 error
= metaslab_alloc(spa
, mc
, SPA_GANGBLOCKSIZE
,
2844 bp
, gbh_copies
, txg
, pio
== gio
? NULL
: gio
->io_bp
, flags
,
2845 &pio
->io_alloc_list
, pio
, pio
->io_allocator
);
2847 if (pio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
) {
2848 ASSERT(pio
->io_priority
== ZIO_PRIORITY_ASYNC_WRITE
);
2852 * If we failed to allocate the gang block header then
2853 * we remove any additional allocation reservations that
2854 * we placed here. The original reservation will
2855 * be removed when the logical I/O goes to the ready
2858 metaslab_class_throttle_unreserve(mc
,
2859 gbh_copies
- copies
, pio
->io_allocator
, pio
);
2862 pio
->io_error
= error
;
2867 gnpp
= &gio
->io_gang_tree
;
2869 gnpp
= pio
->io_private
;
2870 ASSERT(pio
->io_ready
== zio_write_gang_member_ready
);
2873 gn
= zio_gang_node_alloc(gnpp
);
2875 memset(gbh
, 0, SPA_GANGBLOCKSIZE
);
2876 gbh_abd
= abd_get_from_buf(gbh
, SPA_GANGBLOCKSIZE
);
2879 * Create the gang header.
2881 zio
= zio_rewrite(pio
, spa
, txg
, bp
, gbh_abd
, SPA_GANGBLOCKSIZE
,
2882 zio_write_gang_done
, NULL
, pio
->io_priority
,
2883 ZIO_GANG_CHILD_FLAGS(pio
), &pio
->io_bookmark
);
2886 * Create and nowait the gang children.
2888 for (int g
= 0; resid
!= 0; resid
-= lsize
, g
++) {
2889 lsize
= P2ROUNDUP(resid
/ (SPA_GBH_NBLKPTRS
- g
),
2891 ASSERT(lsize
>= SPA_MINBLOCKSIZE
&& lsize
<= resid
);
2893 zp
.zp_checksum
= gio
->io_prop
.zp_checksum
;
2894 zp
.zp_compress
= ZIO_COMPRESS_OFF
;
2895 zp
.zp_complevel
= gio
->io_prop
.zp_complevel
;
2896 zp
.zp_type
= DMU_OT_NONE
;
2898 zp
.zp_copies
= gio
->io_prop
.zp_copies
;
2899 zp
.zp_dedup
= B_FALSE
;
2900 zp
.zp_dedup_verify
= B_FALSE
;
2901 zp
.zp_nopwrite
= B_FALSE
;
2902 zp
.zp_encrypt
= gio
->io_prop
.zp_encrypt
;
2903 zp
.zp_byteorder
= gio
->io_prop
.zp_byteorder
;
2904 memset(zp
.zp_salt
, 0, ZIO_DATA_SALT_LEN
);
2905 memset(zp
.zp_iv
, 0, ZIO_DATA_IV_LEN
);
2906 memset(zp
.zp_mac
, 0, ZIO_DATA_MAC_LEN
);
2908 zio_t
*cio
= zio_write(zio
, spa
, txg
, &gbh
->zg_blkptr
[g
],
2909 has_data
? abd_get_offset(pio
->io_abd
, pio
->io_size
-
2910 resid
) : NULL
, lsize
, lsize
, &zp
,
2911 zio_write_gang_member_ready
, NULL
, NULL
,
2912 zio_write_gang_done
, &gn
->gn_child
[g
], pio
->io_priority
,
2913 ZIO_GANG_CHILD_FLAGS(pio
), &pio
->io_bookmark
);
2915 if (pio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
) {
2916 ASSERT(pio
->io_priority
== ZIO_PRIORITY_ASYNC_WRITE
);
2920 * Gang children won't throttle but we should
2921 * account for their work, so reserve an allocation
2922 * slot for them here.
2924 VERIFY(metaslab_class_throttle_reserve(mc
,
2925 zp
.zp_copies
, cio
->io_allocator
, cio
, flags
));
2931 * Set pio's pipeline to just wait for zio to finish.
2933 pio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
2936 * We didn't allocate this bp, so make sure it doesn't get unmarked.
2938 pio
->io_flags
&= ~ZIO_FLAG_FASTWRITE
;
2946 * The zio_nop_write stage in the pipeline determines if allocating a
2947 * new bp is necessary. The nopwrite feature can handle writes in
2948 * either syncing or open context (i.e. zil writes) and as a result is
2949 * mutually exclusive with dedup.
2951 * By leveraging a cryptographically secure checksum, such as SHA256, we
2952 * can compare the checksums of the new data and the old to determine if
2953 * allocating a new block is required. Note that our requirements for
2954 * cryptographic strength are fairly weak: there can't be any accidental
2955 * hash collisions, but we don't need to be secure against intentional
2956 * (malicious) collisions. To trigger a nopwrite, you have to be able
2957 * to write the file to begin with, and triggering an incorrect (hash
2958 * collision) nopwrite is no worse than simply writing to the file.
2959 * That said, there are no known attacks against the checksum algorithms
2960 * used for nopwrite, assuming that the salt and the checksums
2961 * themselves remain secret.
2964 zio_nop_write(zio_t
*zio
)
2966 blkptr_t
*bp
= zio
->io_bp
;
2967 blkptr_t
*bp_orig
= &zio
->io_bp_orig
;
2968 zio_prop_t
*zp
= &zio
->io_prop
;
2970 ASSERT(BP_GET_LEVEL(bp
) == 0);
2971 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_REWRITE
));
2972 ASSERT(zp
->zp_nopwrite
);
2973 ASSERT(!zp
->zp_dedup
);
2974 ASSERT(zio
->io_bp_override
== NULL
);
2975 ASSERT(IO_IS_ALLOCATING(zio
));
2978 * Check to see if the original bp and the new bp have matching
2979 * characteristics (i.e. same checksum, compression algorithms, etc).
2980 * If they don't then just continue with the pipeline which will
2981 * allocate a new bp.
2983 if (BP_IS_HOLE(bp_orig
) ||
2984 !(zio_checksum_table
[BP_GET_CHECKSUM(bp
)].ci_flags
&
2985 ZCHECKSUM_FLAG_NOPWRITE
) ||
2986 BP_IS_ENCRYPTED(bp
) || BP_IS_ENCRYPTED(bp_orig
) ||
2987 BP_GET_CHECKSUM(bp
) != BP_GET_CHECKSUM(bp_orig
) ||
2988 BP_GET_COMPRESS(bp
) != BP_GET_COMPRESS(bp_orig
) ||
2989 BP_GET_DEDUP(bp
) != BP_GET_DEDUP(bp_orig
) ||
2990 zp
->zp_copies
!= BP_GET_NDVAS(bp_orig
))
2994 * If the checksums match then reset the pipeline so that we
2995 * avoid allocating a new bp and issuing any I/O.
2997 if (ZIO_CHECKSUM_EQUAL(bp
->blk_cksum
, bp_orig
->blk_cksum
)) {
2998 ASSERT(zio_checksum_table
[zp
->zp_checksum
].ci_flags
&
2999 ZCHECKSUM_FLAG_NOPWRITE
);
3000 ASSERT3U(BP_GET_PSIZE(bp
), ==, BP_GET_PSIZE(bp_orig
));
3001 ASSERT3U(BP_GET_LSIZE(bp
), ==, BP_GET_LSIZE(bp_orig
));
3002 ASSERT(zp
->zp_compress
!= ZIO_COMPRESS_OFF
);
3003 ASSERT(memcmp(&bp
->blk_prop
, &bp_orig
->blk_prop
,
3004 sizeof (uint64_t)) == 0);
3007 * If we're overwriting a block that is currently on an
3008 * indirect vdev, then ignore the nopwrite request and
3009 * allow a new block to be allocated on a concrete vdev.
3011 spa_config_enter(zio
->io_spa
, SCL_VDEV
, FTAG
, RW_READER
);
3012 vdev_t
*tvd
= vdev_lookup_top(zio
->io_spa
,
3013 DVA_GET_VDEV(&bp
->blk_dva
[0]));
3014 if (tvd
->vdev_ops
== &vdev_indirect_ops
) {
3015 spa_config_exit(zio
->io_spa
, SCL_VDEV
, FTAG
);
3018 spa_config_exit(zio
->io_spa
, SCL_VDEV
, FTAG
);
3021 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
3022 zio
->io_flags
|= ZIO_FLAG_NOPWRITE
;
3029 * ==========================================================================
3031 * ==========================================================================
3034 zio_ddt_child_read_done(zio_t
*zio
)
3036 blkptr_t
*bp
= zio
->io_bp
;
3037 ddt_entry_t
*dde
= zio
->io_private
;
3039 zio_t
*pio
= zio_unique_parent(zio
);
3041 mutex_enter(&pio
->io_lock
);
3042 ddp
= ddt_phys_select(dde
, bp
);
3043 if (zio
->io_error
== 0)
3044 ddt_phys_clear(ddp
); /* this ddp doesn't need repair */
3046 if (zio
->io_error
== 0 && dde
->dde_repair_abd
== NULL
)
3047 dde
->dde_repair_abd
= zio
->io_abd
;
3049 abd_free(zio
->io_abd
);
3050 mutex_exit(&pio
->io_lock
);
3054 zio_ddt_read_start(zio_t
*zio
)
3056 blkptr_t
*bp
= zio
->io_bp
;
3058 ASSERT(BP_GET_DEDUP(bp
));
3059 ASSERT(BP_GET_PSIZE(bp
) == zio
->io_size
);
3060 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
3062 if (zio
->io_child_error
[ZIO_CHILD_DDT
]) {
3063 ddt_t
*ddt
= ddt_select(zio
->io_spa
, bp
);
3064 ddt_entry_t
*dde
= ddt_repair_start(ddt
, bp
);
3065 ddt_phys_t
*ddp
= dde
->dde_phys
;
3066 ddt_phys_t
*ddp_self
= ddt_phys_select(dde
, bp
);
3069 ASSERT(zio
->io_vsd
== NULL
);
3072 if (ddp_self
== NULL
)
3075 for (int p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
3076 if (ddp
->ddp_phys_birth
== 0 || ddp
== ddp_self
)
3078 ddt_bp_create(ddt
->ddt_checksum
, &dde
->dde_key
, ddp
,
3080 zio_nowait(zio_read(zio
, zio
->io_spa
, &blk
,
3081 abd_alloc_for_io(zio
->io_size
, B_TRUE
),
3082 zio
->io_size
, zio_ddt_child_read_done
, dde
,
3083 zio
->io_priority
, ZIO_DDT_CHILD_FLAGS(zio
) |
3084 ZIO_FLAG_DONT_PROPAGATE
, &zio
->io_bookmark
));
3089 zio_nowait(zio_read(zio
, zio
->io_spa
, bp
,
3090 zio
->io_abd
, zio
->io_size
, NULL
, NULL
, zio
->io_priority
,
3091 ZIO_DDT_CHILD_FLAGS(zio
), &zio
->io_bookmark
));
3097 zio_ddt_read_done(zio_t
*zio
)
3099 blkptr_t
*bp
= zio
->io_bp
;
3101 if (zio_wait_for_children(zio
, ZIO_CHILD_DDT_BIT
, ZIO_WAIT_DONE
)) {
3105 ASSERT(BP_GET_DEDUP(bp
));
3106 ASSERT(BP_GET_PSIZE(bp
) == zio
->io_size
);
3107 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
3109 if (zio
->io_child_error
[ZIO_CHILD_DDT
]) {
3110 ddt_t
*ddt
= ddt_select(zio
->io_spa
, bp
);
3111 ddt_entry_t
*dde
= zio
->io_vsd
;
3113 ASSERT(spa_load_state(zio
->io_spa
) != SPA_LOAD_NONE
);
3117 zio
->io_stage
= ZIO_STAGE_DDT_READ_START
>> 1;
3118 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, B_FALSE
);
3121 if (dde
->dde_repair_abd
!= NULL
) {
3122 abd_copy(zio
->io_abd
, dde
->dde_repair_abd
,
3124 zio
->io_child_error
[ZIO_CHILD_DDT
] = 0;
3126 ddt_repair_done(ddt
, dde
);
3130 ASSERT(zio
->io_vsd
== NULL
);
3136 zio_ddt_collision(zio_t
*zio
, ddt_t
*ddt
, ddt_entry_t
*dde
)
3138 spa_t
*spa
= zio
->io_spa
;
3139 boolean_t do_raw
= !!(zio
->io_flags
& ZIO_FLAG_RAW
);
3141 ASSERT(!(zio
->io_bp_override
&& do_raw
));
3144 * Note: we compare the original data, not the transformed data,
3145 * because when zio->io_bp is an override bp, we will not have
3146 * pushed the I/O transforms. That's an important optimization
3147 * because otherwise we'd compress/encrypt all dmu_sync() data twice.
3148 * However, we should never get a raw, override zio so in these
3149 * cases we can compare the io_abd directly. This is useful because
3150 * it allows us to do dedup verification even if we don't have access
3151 * to the original data (for instance, if the encryption keys aren't
3155 for (int p
= DDT_PHYS_SINGLE
; p
<= DDT_PHYS_TRIPLE
; p
++) {
3156 zio_t
*lio
= dde
->dde_lead_zio
[p
];
3158 if (lio
!= NULL
&& do_raw
) {
3159 return (lio
->io_size
!= zio
->io_size
||
3160 abd_cmp(zio
->io_abd
, lio
->io_abd
) != 0);
3161 } else if (lio
!= NULL
) {
3162 return (lio
->io_orig_size
!= zio
->io_orig_size
||
3163 abd_cmp(zio
->io_orig_abd
, lio
->io_orig_abd
) != 0);
3167 for (int p
= DDT_PHYS_SINGLE
; p
<= DDT_PHYS_TRIPLE
; p
++) {
3168 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
3170 if (ddp
->ddp_phys_birth
!= 0 && do_raw
) {
3171 blkptr_t blk
= *zio
->io_bp
;
3176 ddt_bp_fill(ddp
, &blk
, ddp
->ddp_phys_birth
);
3177 psize
= BP_GET_PSIZE(&blk
);
3179 if (psize
!= zio
->io_size
)
3184 tmpabd
= abd_alloc_for_io(psize
, B_TRUE
);
3186 error
= zio_wait(zio_read(NULL
, spa
, &blk
, tmpabd
,
3187 psize
, NULL
, NULL
, ZIO_PRIORITY_SYNC_READ
,
3188 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
|
3189 ZIO_FLAG_RAW
, &zio
->io_bookmark
));
3192 if (abd_cmp(tmpabd
, zio
->io_abd
) != 0)
3193 error
= SET_ERROR(ENOENT
);
3198 return (error
!= 0);
3199 } else if (ddp
->ddp_phys_birth
!= 0) {
3200 arc_buf_t
*abuf
= NULL
;
3201 arc_flags_t aflags
= ARC_FLAG_WAIT
;
3202 blkptr_t blk
= *zio
->io_bp
;
3205 ddt_bp_fill(ddp
, &blk
, ddp
->ddp_phys_birth
);
3207 if (BP_GET_LSIZE(&blk
) != zio
->io_orig_size
)
3212 error
= arc_read(NULL
, spa
, &blk
,
3213 arc_getbuf_func
, &abuf
, ZIO_PRIORITY_SYNC_READ
,
3214 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
,
3215 &aflags
, &zio
->io_bookmark
);
3218 if (abd_cmp_buf(zio
->io_orig_abd
, abuf
->b_data
,
3219 zio
->io_orig_size
) != 0)
3220 error
= SET_ERROR(ENOENT
);
3221 arc_buf_destroy(abuf
, &abuf
);
3225 return (error
!= 0);
3233 zio_ddt_child_write_ready(zio_t
*zio
)
3235 int p
= zio
->io_prop
.zp_copies
;
3236 ddt_t
*ddt
= ddt_select(zio
->io_spa
, zio
->io_bp
);
3237 ddt_entry_t
*dde
= zio
->io_private
;
3238 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
3246 ASSERT(dde
->dde_lead_zio
[p
] == zio
);
3248 ddt_phys_fill(ddp
, zio
->io_bp
);
3250 zio_link_t
*zl
= NULL
;
3251 while ((pio
= zio_walk_parents(zio
, &zl
)) != NULL
)
3252 ddt_bp_fill(ddp
, pio
->io_bp
, zio
->io_txg
);
3258 zio_ddt_child_write_done(zio_t
*zio
)
3260 int p
= zio
->io_prop
.zp_copies
;
3261 ddt_t
*ddt
= ddt_select(zio
->io_spa
, zio
->io_bp
);
3262 ddt_entry_t
*dde
= zio
->io_private
;
3263 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
3267 ASSERT(ddp
->ddp_refcnt
== 0);
3268 ASSERT(dde
->dde_lead_zio
[p
] == zio
);
3269 dde
->dde_lead_zio
[p
] = NULL
;
3271 if (zio
->io_error
== 0) {
3272 zio_link_t
*zl
= NULL
;
3273 while (zio_walk_parents(zio
, &zl
) != NULL
)
3274 ddt_phys_addref(ddp
);
3276 ddt_phys_clear(ddp
);
3283 zio_ddt_write(zio_t
*zio
)
3285 spa_t
*spa
= zio
->io_spa
;
3286 blkptr_t
*bp
= zio
->io_bp
;
3287 uint64_t txg
= zio
->io_txg
;
3288 zio_prop_t
*zp
= &zio
->io_prop
;
3289 int p
= zp
->zp_copies
;
3291 ddt_t
*ddt
= ddt_select(spa
, bp
);
3295 ASSERT(BP_GET_DEDUP(bp
));
3296 ASSERT(BP_GET_CHECKSUM(bp
) == zp
->zp_checksum
);
3297 ASSERT(BP_IS_HOLE(bp
) || zio
->io_bp_override
);
3298 ASSERT(!(zio
->io_bp_override
&& (zio
->io_flags
& ZIO_FLAG_RAW
)));
3301 dde
= ddt_lookup(ddt
, bp
, B_TRUE
);
3302 ddp
= &dde
->dde_phys
[p
];
3304 if (zp
->zp_dedup_verify
&& zio_ddt_collision(zio
, ddt
, dde
)) {
3306 * If we're using a weak checksum, upgrade to a strong checksum
3307 * and try again. If we're already using a strong checksum,
3308 * we can't resolve it, so just convert to an ordinary write.
3309 * (And automatically e-mail a paper to Nature?)
3311 if (!(zio_checksum_table
[zp
->zp_checksum
].ci_flags
&
3312 ZCHECKSUM_FLAG_DEDUP
)) {
3313 zp
->zp_checksum
= spa_dedup_checksum(spa
);
3314 zio_pop_transforms(zio
);
3315 zio
->io_stage
= ZIO_STAGE_OPEN
;
3318 zp
->zp_dedup
= B_FALSE
;
3319 BP_SET_DEDUP(bp
, B_FALSE
);
3321 ASSERT(!BP_GET_DEDUP(bp
));
3322 zio
->io_pipeline
= ZIO_WRITE_PIPELINE
;
3327 if (ddp
->ddp_phys_birth
!= 0 || dde
->dde_lead_zio
[p
] != NULL
) {
3328 if (ddp
->ddp_phys_birth
!= 0)
3329 ddt_bp_fill(ddp
, bp
, txg
);
3330 if (dde
->dde_lead_zio
[p
] != NULL
)
3331 zio_add_child(zio
, dde
->dde_lead_zio
[p
]);
3333 ddt_phys_addref(ddp
);
3334 } else if (zio
->io_bp_override
) {
3335 ASSERT(bp
->blk_birth
== txg
);
3336 ASSERT(BP_EQUAL(bp
, zio
->io_bp_override
));
3337 ddt_phys_fill(ddp
, bp
);
3338 ddt_phys_addref(ddp
);
3340 cio
= zio_write(zio
, spa
, txg
, bp
, zio
->io_orig_abd
,
3341 zio
->io_orig_size
, zio
->io_orig_size
, zp
,
3342 zio_ddt_child_write_ready
, NULL
, NULL
,
3343 zio_ddt_child_write_done
, dde
, zio
->io_priority
,
3344 ZIO_DDT_CHILD_FLAGS(zio
), &zio
->io_bookmark
);
3346 zio_push_transform(cio
, zio
->io_abd
, zio
->io_size
, 0, NULL
);
3347 dde
->dde_lead_zio
[p
] = cio
;
3357 ddt_entry_t
*freedde
; /* for debugging */
3360 zio_ddt_free(zio_t
*zio
)
3362 spa_t
*spa
= zio
->io_spa
;
3363 blkptr_t
*bp
= zio
->io_bp
;
3364 ddt_t
*ddt
= ddt_select(spa
, bp
);
3368 ASSERT(BP_GET_DEDUP(bp
));
3369 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
3372 freedde
= dde
= ddt_lookup(ddt
, bp
, B_TRUE
);
3374 ddp
= ddt_phys_select(dde
, bp
);
3376 ddt_phys_decref(ddp
);
3384 * ==========================================================================
3385 * Allocate and free blocks
3386 * ==========================================================================
3390 zio_io_to_allocate(spa_t
*spa
, int allocator
)
3394 ASSERT(MUTEX_HELD(&spa
->spa_allocs
[allocator
].spaa_lock
));
3396 zio
= avl_first(&spa
->spa_allocs
[allocator
].spaa_tree
);
3400 ASSERT(IO_IS_ALLOCATING(zio
));
3403 * Try to place a reservation for this zio. If we're unable to
3404 * reserve then we throttle.
3406 ASSERT3U(zio
->io_allocator
, ==, allocator
);
3407 if (!metaslab_class_throttle_reserve(zio
->io_metaslab_class
,
3408 zio
->io_prop
.zp_copies
, allocator
, zio
, 0)) {
3412 avl_remove(&spa
->spa_allocs
[allocator
].spaa_tree
, zio
);
3413 ASSERT3U(zio
->io_stage
, <, ZIO_STAGE_DVA_ALLOCATE
);
3419 zio_dva_throttle(zio_t
*zio
)
3421 spa_t
*spa
= zio
->io_spa
;
3423 metaslab_class_t
*mc
;
3425 /* locate an appropriate allocation class */
3426 mc
= spa_preferred_class(spa
, zio
->io_size
, zio
->io_prop
.zp_type
,
3427 zio
->io_prop
.zp_level
, zio
->io_prop
.zp_zpl_smallblk
);
3429 if (zio
->io_priority
== ZIO_PRIORITY_SYNC_WRITE
||
3430 !mc
->mc_alloc_throttle_enabled
||
3431 zio
->io_child_type
== ZIO_CHILD_GANG
||
3432 zio
->io_flags
& ZIO_FLAG_NODATA
) {
3436 ASSERT(zio
->io_type
== ZIO_TYPE_WRITE
);
3437 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
3438 ASSERT3U(zio
->io_queued_timestamp
, >, 0);
3439 ASSERT(zio
->io_stage
== ZIO_STAGE_DVA_THROTTLE
);
3441 zbookmark_phys_t
*bm
= &zio
->io_bookmark
;
3443 * We want to try to use as many allocators as possible to help improve
3444 * performance, but we also want logically adjacent IOs to be physically
3445 * adjacent to improve sequential read performance. We chunk each object
3446 * into 2^20 block regions, and then hash based on the objset, object,
3447 * level, and region to accomplish both of these goals.
3449 int allocator
= (uint_t
)cityhash4(bm
->zb_objset
, bm
->zb_object
,
3450 bm
->zb_level
, bm
->zb_blkid
>> 20) % spa
->spa_alloc_count
;
3451 zio
->io_allocator
= allocator
;
3452 zio
->io_metaslab_class
= mc
;
3453 mutex_enter(&spa
->spa_allocs
[allocator
].spaa_lock
);
3454 avl_add(&spa
->spa_allocs
[allocator
].spaa_tree
, zio
);
3455 nio
= zio_io_to_allocate(spa
, allocator
);
3456 mutex_exit(&spa
->spa_allocs
[allocator
].spaa_lock
);
3461 zio_allocate_dispatch(spa_t
*spa
, int allocator
)
3465 mutex_enter(&spa
->spa_allocs
[allocator
].spaa_lock
);
3466 zio
= zio_io_to_allocate(spa
, allocator
);
3467 mutex_exit(&spa
->spa_allocs
[allocator
].spaa_lock
);
3471 ASSERT3U(zio
->io_stage
, ==, ZIO_STAGE_DVA_THROTTLE
);
3472 ASSERT0(zio
->io_error
);
3473 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, B_TRUE
);
3477 zio_dva_allocate(zio_t
*zio
)
3479 spa_t
*spa
= zio
->io_spa
;
3480 metaslab_class_t
*mc
;
3481 blkptr_t
*bp
= zio
->io_bp
;
3485 if (zio
->io_gang_leader
== NULL
) {
3486 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
3487 zio
->io_gang_leader
= zio
;
3490 ASSERT(BP_IS_HOLE(bp
));
3491 ASSERT0(BP_GET_NDVAS(bp
));
3492 ASSERT3U(zio
->io_prop
.zp_copies
, >, 0);
3493 ASSERT3U(zio
->io_prop
.zp_copies
, <=, spa_max_replication(spa
));
3494 ASSERT3U(zio
->io_size
, ==, BP_GET_PSIZE(bp
));
3496 flags
|= (zio
->io_flags
& ZIO_FLAG_FASTWRITE
) ? METASLAB_FASTWRITE
: 0;
3497 if (zio
->io_flags
& ZIO_FLAG_NODATA
)
3498 flags
|= METASLAB_DONT_THROTTLE
;
3499 if (zio
->io_flags
& ZIO_FLAG_GANG_CHILD
)
3500 flags
|= METASLAB_GANG_CHILD
;
3501 if (zio
->io_priority
== ZIO_PRIORITY_ASYNC_WRITE
)
3502 flags
|= METASLAB_ASYNC_ALLOC
;
3505 * if not already chosen, locate an appropriate allocation class
3507 mc
= zio
->io_metaslab_class
;
3509 mc
= spa_preferred_class(spa
, zio
->io_size
,
3510 zio
->io_prop
.zp_type
, zio
->io_prop
.zp_level
,
3511 zio
->io_prop
.zp_zpl_smallblk
);
3512 zio
->io_metaslab_class
= mc
;
3516 * Try allocating the block in the usual metaslab class.
3517 * If that's full, allocate it in the normal class.
3518 * If that's full, allocate as a gang block,
3519 * and if all are full, the allocation fails (which shouldn't happen).
3521 * Note that we do not fall back on embedded slog (ZIL) space, to
3522 * preserve unfragmented slog space, which is critical for decent
3523 * sync write performance. If a log allocation fails, we will fall
3524 * back to spa_sync() which is abysmal for performance.
3526 error
= metaslab_alloc(spa
, mc
, zio
->io_size
, bp
,
3527 zio
->io_prop
.zp_copies
, zio
->io_txg
, NULL
, flags
,
3528 &zio
->io_alloc_list
, zio
, zio
->io_allocator
);
3531 * Fallback to normal class when an alloc class is full
3533 if (error
== ENOSPC
&& mc
!= spa_normal_class(spa
)) {
3535 * If throttling, transfer reservation over to normal class.
3536 * The io_allocator slot can remain the same even though we
3537 * are switching classes.
3539 if (mc
->mc_alloc_throttle_enabled
&&
3540 (zio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
)) {
3541 metaslab_class_throttle_unreserve(mc
,
3542 zio
->io_prop
.zp_copies
, zio
->io_allocator
, zio
);
3543 zio
->io_flags
&= ~ZIO_FLAG_IO_ALLOCATING
;
3545 VERIFY(metaslab_class_throttle_reserve(
3546 spa_normal_class(spa
),
3547 zio
->io_prop
.zp_copies
, zio
->io_allocator
, zio
,
3548 flags
| METASLAB_MUST_RESERVE
));
3550 zio
->io_metaslab_class
= mc
= spa_normal_class(spa
);
3551 if (zfs_flags
& ZFS_DEBUG_METASLAB_ALLOC
) {
3552 zfs_dbgmsg("%s: metaslab allocation failure, "
3553 "trying normal class: zio %px, size %llu, error %d",
3554 spa_name(spa
), zio
, (u_longlong_t
)zio
->io_size
,
3558 error
= metaslab_alloc(spa
, mc
, zio
->io_size
, bp
,
3559 zio
->io_prop
.zp_copies
, zio
->io_txg
, NULL
, flags
,
3560 &zio
->io_alloc_list
, zio
, zio
->io_allocator
);
3563 if (error
== ENOSPC
&& zio
->io_size
> SPA_MINBLOCKSIZE
) {
3564 if (zfs_flags
& ZFS_DEBUG_METASLAB_ALLOC
) {
3565 zfs_dbgmsg("%s: metaslab allocation failure, "
3566 "trying ganging: zio %px, size %llu, error %d",
3567 spa_name(spa
), zio
, (u_longlong_t
)zio
->io_size
,
3570 return (zio_write_gang_block(zio
, mc
));
3573 if (error
!= ENOSPC
||
3574 (zfs_flags
& ZFS_DEBUG_METASLAB_ALLOC
)) {
3575 zfs_dbgmsg("%s: metaslab allocation failure: zio %px, "
3576 "size %llu, error %d",
3577 spa_name(spa
), zio
, (u_longlong_t
)zio
->io_size
,
3580 zio
->io_error
= error
;
3587 zio_dva_free(zio_t
*zio
)
3589 metaslab_free(zio
->io_spa
, zio
->io_bp
, zio
->io_txg
, B_FALSE
);
3595 zio_dva_claim(zio_t
*zio
)
3599 error
= metaslab_claim(zio
->io_spa
, zio
->io_bp
, zio
->io_txg
);
3601 zio
->io_error
= error
;
3607 * Undo an allocation. This is used by zio_done() when an I/O fails
3608 * and we want to give back the block we just allocated.
3609 * This handles both normal blocks and gang blocks.
3612 zio_dva_unallocate(zio_t
*zio
, zio_gang_node_t
*gn
, blkptr_t
*bp
)
3614 ASSERT(bp
->blk_birth
== zio
->io_txg
|| BP_IS_HOLE(bp
));
3615 ASSERT(zio
->io_bp_override
== NULL
);
3617 if (!BP_IS_HOLE(bp
))
3618 metaslab_free(zio
->io_spa
, bp
, bp
->blk_birth
, B_TRUE
);
3621 for (int g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++) {
3622 zio_dva_unallocate(zio
, gn
->gn_child
[g
],
3623 &gn
->gn_gbh
->zg_blkptr
[g
]);
3629 * Try to allocate an intent log block. Return 0 on success, errno on failure.
3632 zio_alloc_zil(spa_t
*spa
, objset_t
*os
, uint64_t txg
, blkptr_t
*new_bp
,
3633 uint64_t size
, boolean_t
*slog
)
3636 zio_alloc_list_t io_alloc_list
;
3638 ASSERT(txg
> spa_syncing_txg(spa
));
3640 metaslab_trace_init(&io_alloc_list
);
3643 * Block pointer fields are useful to metaslabs for stats and debugging.
3644 * Fill in the obvious ones before calling into metaslab_alloc().
3646 BP_SET_TYPE(new_bp
, DMU_OT_INTENT_LOG
);
3647 BP_SET_PSIZE(new_bp
, size
);
3648 BP_SET_LEVEL(new_bp
, 0);
3651 * When allocating a zil block, we don't have information about
3652 * the final destination of the block except the objset it's part
3653 * of, so we just hash the objset ID to pick the allocator to get
3656 int flags
= METASLAB_FASTWRITE
| METASLAB_ZIL
;
3657 int allocator
= (uint_t
)cityhash4(0, 0, 0,
3658 os
->os_dsl_dataset
->ds_object
) % spa
->spa_alloc_count
;
3659 error
= metaslab_alloc(spa
, spa_log_class(spa
), size
, new_bp
, 1,
3660 txg
, NULL
, flags
, &io_alloc_list
, NULL
, allocator
);
3661 *slog
= (error
== 0);
3663 error
= metaslab_alloc(spa
, spa_embedded_log_class(spa
), size
,
3664 new_bp
, 1, txg
, NULL
, flags
,
3665 &io_alloc_list
, NULL
, allocator
);
3668 error
= metaslab_alloc(spa
, spa_normal_class(spa
), size
,
3669 new_bp
, 1, txg
, NULL
, flags
,
3670 &io_alloc_list
, NULL
, allocator
);
3672 metaslab_trace_fini(&io_alloc_list
);
3675 BP_SET_LSIZE(new_bp
, size
);
3676 BP_SET_PSIZE(new_bp
, size
);
3677 BP_SET_COMPRESS(new_bp
, ZIO_COMPRESS_OFF
);
3678 BP_SET_CHECKSUM(new_bp
,
3679 spa_version(spa
) >= SPA_VERSION_SLIM_ZIL
3680 ? ZIO_CHECKSUM_ZILOG2
: ZIO_CHECKSUM_ZILOG
);
3681 BP_SET_TYPE(new_bp
, DMU_OT_INTENT_LOG
);
3682 BP_SET_LEVEL(new_bp
, 0);
3683 BP_SET_DEDUP(new_bp
, 0);
3684 BP_SET_BYTEORDER(new_bp
, ZFS_HOST_BYTEORDER
);
3687 * encrypted blocks will require an IV and salt. We generate
3688 * these now since we will not be rewriting the bp at
3691 if (os
->os_encrypted
) {
3692 uint8_t iv
[ZIO_DATA_IV_LEN
];
3693 uint8_t salt
[ZIO_DATA_SALT_LEN
];
3695 BP_SET_CRYPT(new_bp
, B_TRUE
);
3696 VERIFY0(spa_crypt_get_salt(spa
,
3697 dmu_objset_id(os
), salt
));
3698 VERIFY0(zio_crypt_generate_iv(iv
));
3700 zio_crypt_encode_params_bp(new_bp
, salt
, iv
);
3703 zfs_dbgmsg("%s: zil block allocation failure: "
3704 "size %llu, error %d", spa_name(spa
), (u_longlong_t
)size
,
3712 * ==========================================================================
3713 * Read and write to physical devices
3714 * ==========================================================================
3718 * Issue an I/O to the underlying vdev. Typically the issue pipeline
3719 * stops after this stage and will resume upon I/O completion.
3720 * However, there are instances where the vdev layer may need to
3721 * continue the pipeline when an I/O was not issued. Since the I/O
3722 * that was sent to the vdev layer might be different than the one
3723 * currently active in the pipeline (see vdev_queue_io()), we explicitly
3724 * force the underlying vdev layers to call either zio_execute() or
3725 * zio_interrupt() to ensure that the pipeline continues with the correct I/O.
3728 zio_vdev_io_start(zio_t
*zio
)
3730 vdev_t
*vd
= zio
->io_vd
;
3732 spa_t
*spa
= zio
->io_spa
;
3736 ASSERT(zio
->io_error
== 0);
3737 ASSERT(zio
->io_child_error
[ZIO_CHILD_VDEV
] == 0);
3740 if (!(zio
->io_flags
& ZIO_FLAG_CONFIG_WRITER
))
3741 spa_config_enter(spa
, SCL_ZIO
, zio
, RW_READER
);
3744 * The mirror_ops handle multiple DVAs in a single BP.
3746 vdev_mirror_ops
.vdev_op_io_start(zio
);
3750 ASSERT3P(zio
->io_logical
, !=, zio
);
3751 if (zio
->io_type
== ZIO_TYPE_WRITE
) {
3752 ASSERT(spa
->spa_trust_config
);
3755 * Note: the code can handle other kinds of writes,
3756 * but we don't expect them.
3758 if (zio
->io_vd
->vdev_noalloc
) {
3759 ASSERT(zio
->io_flags
&
3760 (ZIO_FLAG_PHYSICAL
| ZIO_FLAG_SELF_HEAL
|
3761 ZIO_FLAG_RESILVER
| ZIO_FLAG_INDUCE_DAMAGE
));
3765 align
= 1ULL << vd
->vdev_top
->vdev_ashift
;
3767 if (!(zio
->io_flags
& ZIO_FLAG_PHYSICAL
) &&
3768 P2PHASE(zio
->io_size
, align
) != 0) {
3769 /* Transform logical writes to be a full physical block size. */
3770 uint64_t asize
= P2ROUNDUP(zio
->io_size
, align
);
3771 abd_t
*abuf
= abd_alloc_sametype(zio
->io_abd
, asize
);
3772 ASSERT(vd
== vd
->vdev_top
);
3773 if (zio
->io_type
== ZIO_TYPE_WRITE
) {
3774 abd_copy(abuf
, zio
->io_abd
, zio
->io_size
);
3775 abd_zero_off(abuf
, zio
->io_size
, asize
- zio
->io_size
);
3777 zio_push_transform(zio
, abuf
, asize
, asize
, zio_subblock
);
3781 * If this is not a physical io, make sure that it is properly aligned
3782 * before proceeding.
3784 if (!(zio
->io_flags
& ZIO_FLAG_PHYSICAL
)) {
3785 ASSERT0(P2PHASE(zio
->io_offset
, align
));
3786 ASSERT0(P2PHASE(zio
->io_size
, align
));
3789 * For physical writes, we allow 512b aligned writes and assume
3790 * the device will perform a read-modify-write as necessary.
3792 ASSERT0(P2PHASE(zio
->io_offset
, SPA_MINBLOCKSIZE
));
3793 ASSERT0(P2PHASE(zio
->io_size
, SPA_MINBLOCKSIZE
));
3796 VERIFY(zio
->io_type
!= ZIO_TYPE_WRITE
|| spa_writeable(spa
));
3799 * If this is a repair I/O, and there's no self-healing involved --
3800 * that is, we're just resilvering what we expect to resilver --
3801 * then don't do the I/O unless zio's txg is actually in vd's DTL.
3802 * This prevents spurious resilvering.
3804 * There are a few ways that we can end up creating these spurious
3807 * 1. A resilver i/o will be issued if any DVA in the BP has a
3808 * dirty DTL. The mirror code will issue resilver writes to
3809 * each DVA, including the one(s) that are not on vdevs with dirty
3812 * 2. With nested replication, which happens when we have a
3813 * "replacing" or "spare" vdev that's a child of a mirror or raidz.
3814 * For example, given mirror(replacing(A+B), C), it's likely that
3815 * only A is out of date (it's the new device). In this case, we'll
3816 * read from C, then use the data to resilver A+B -- but we don't
3817 * actually want to resilver B, just A. The top-level mirror has no
3818 * way to know this, so instead we just discard unnecessary repairs
3819 * as we work our way down the vdev tree.
3821 * 3. ZTEST also creates mirrors of mirrors, mirrors of raidz, etc.
3822 * The same logic applies to any form of nested replication: ditto
3823 * + mirror, RAID-Z + replacing, etc.
3825 * However, indirect vdevs point off to other vdevs which may have
3826 * DTL's, so we never bypass them. The child i/os on concrete vdevs
3827 * will be properly bypassed instead.
3829 * Leaf DTL_PARTIAL can be empty when a legitimate write comes from
3830 * a dRAID spare vdev. For example, when a dRAID spare is first
3831 * used, its spare blocks need to be written to but the leaf vdev's
3832 * of such blocks can have empty DTL_PARTIAL.
3834 * There seemed no clean way to allow such writes while bypassing
3835 * spurious ones. At this point, just avoid all bypassing for dRAID
3838 if ((zio
->io_flags
& ZIO_FLAG_IO_REPAIR
) &&
3839 !(zio
->io_flags
& ZIO_FLAG_SELF_HEAL
) &&
3840 zio
->io_txg
!= 0 && /* not a delegated i/o */
3841 vd
->vdev_ops
!= &vdev_indirect_ops
&&
3842 vd
->vdev_top
->vdev_ops
!= &vdev_draid_ops
&&
3843 !vdev_dtl_contains(vd
, DTL_PARTIAL
, zio
->io_txg
, 1)) {
3844 ASSERT(zio
->io_type
== ZIO_TYPE_WRITE
);
3845 zio_vdev_io_bypass(zio
);
3850 * Select the next best leaf I/O to process. Distributed spares are
3851 * excluded since they dispatch the I/O directly to a leaf vdev after
3852 * applying the dRAID mapping.
3854 if (vd
->vdev_ops
->vdev_op_leaf
&&
3855 vd
->vdev_ops
!= &vdev_draid_spare_ops
&&
3856 (zio
->io_type
== ZIO_TYPE_READ
||
3857 zio
->io_type
== ZIO_TYPE_WRITE
||
3858 zio
->io_type
== ZIO_TYPE_TRIM
)) {
3860 if (zio
->io_type
== ZIO_TYPE_READ
&& vdev_cache_read(zio
))
3863 if ((zio
= vdev_queue_io(zio
)) == NULL
)
3866 if (!vdev_accessible(vd
, zio
)) {
3867 zio
->io_error
= SET_ERROR(ENXIO
);
3871 zio
->io_delay
= gethrtime();
3874 vd
->vdev_ops
->vdev_op_io_start(zio
);
3879 zio_vdev_io_done(zio_t
*zio
)
3881 vdev_t
*vd
= zio
->io_vd
;
3882 vdev_ops_t
*ops
= vd
? vd
->vdev_ops
: &vdev_mirror_ops
;
3883 boolean_t unexpected_error
= B_FALSE
;
3885 if (zio_wait_for_children(zio
, ZIO_CHILD_VDEV_BIT
, ZIO_WAIT_DONE
)) {
3889 ASSERT(zio
->io_type
== ZIO_TYPE_READ
||
3890 zio
->io_type
== ZIO_TYPE_WRITE
|| zio
->io_type
== ZIO_TYPE_TRIM
);
3893 zio
->io_delay
= gethrtime() - zio
->io_delay
;
3895 if (vd
!= NULL
&& vd
->vdev_ops
->vdev_op_leaf
&&
3896 vd
->vdev_ops
!= &vdev_draid_spare_ops
) {
3897 vdev_queue_io_done(zio
);
3899 if (zio
->io_type
== ZIO_TYPE_WRITE
)
3900 vdev_cache_write(zio
);
3902 if (zio_injection_enabled
&& zio
->io_error
== 0)
3903 zio
->io_error
= zio_handle_device_injections(vd
, zio
,
3906 if (zio_injection_enabled
&& zio
->io_error
== 0)
3907 zio
->io_error
= zio_handle_label_injection(zio
, EIO
);
3909 if (zio
->io_error
&& zio
->io_type
!= ZIO_TYPE_TRIM
) {
3910 if (!vdev_accessible(vd
, zio
)) {
3911 zio
->io_error
= SET_ERROR(ENXIO
);
3913 unexpected_error
= B_TRUE
;
3918 ops
->vdev_op_io_done(zio
);
3920 if (unexpected_error
)
3921 VERIFY(vdev_probe(vd
, zio
) == NULL
);
3927 * This function is used to change the priority of an existing zio that is
3928 * currently in-flight. This is used by the arc to upgrade priority in the
3929 * event that a demand read is made for a block that is currently queued
3930 * as a scrub or async read IO. Otherwise, the high priority read request
3931 * would end up having to wait for the lower priority IO.
3934 zio_change_priority(zio_t
*pio
, zio_priority_t priority
)
3936 zio_t
*cio
, *cio_next
;
3937 zio_link_t
*zl
= NULL
;
3939 ASSERT3U(priority
, <, ZIO_PRIORITY_NUM_QUEUEABLE
);
3941 if (pio
->io_vd
!= NULL
&& pio
->io_vd
->vdev_ops
->vdev_op_leaf
) {
3942 vdev_queue_change_io_priority(pio
, priority
);
3944 pio
->io_priority
= priority
;
3947 mutex_enter(&pio
->io_lock
);
3948 for (cio
= zio_walk_children(pio
, &zl
); cio
!= NULL
; cio
= cio_next
) {
3949 cio_next
= zio_walk_children(pio
, &zl
);
3950 zio_change_priority(cio
, priority
);
3952 mutex_exit(&pio
->io_lock
);
3956 * For non-raidz ZIOs, we can just copy aside the bad data read from the
3957 * disk, and use that to finish the checksum ereport later.
3960 zio_vsd_default_cksum_finish(zio_cksum_report_t
*zcr
,
3961 const abd_t
*good_buf
)
3963 /* no processing needed */
3964 zfs_ereport_finish_checksum(zcr
, good_buf
, zcr
->zcr_cbdata
, B_FALSE
);
3968 zio_vsd_default_cksum_report(zio_t
*zio
, zio_cksum_report_t
*zcr
)
3970 void *abd
= abd_alloc_sametype(zio
->io_abd
, zio
->io_size
);
3972 abd_copy(abd
, zio
->io_abd
, zio
->io_size
);
3974 zcr
->zcr_cbinfo
= zio
->io_size
;
3975 zcr
->zcr_cbdata
= abd
;
3976 zcr
->zcr_finish
= zio_vsd_default_cksum_finish
;
3977 zcr
->zcr_free
= zio_abd_free
;
3981 zio_vdev_io_assess(zio_t
*zio
)
3983 vdev_t
*vd
= zio
->io_vd
;
3985 if (zio_wait_for_children(zio
, ZIO_CHILD_VDEV_BIT
, ZIO_WAIT_DONE
)) {
3989 if (vd
== NULL
&& !(zio
->io_flags
& ZIO_FLAG_CONFIG_WRITER
))
3990 spa_config_exit(zio
->io_spa
, SCL_ZIO
, zio
);
3992 if (zio
->io_vsd
!= NULL
) {
3993 zio
->io_vsd_ops
->vsd_free(zio
);
3997 if (zio_injection_enabled
&& zio
->io_error
== 0)
3998 zio
->io_error
= zio_handle_fault_injection(zio
, EIO
);
4001 * If the I/O failed, determine whether we should attempt to retry it.
4003 * On retry, we cut in line in the issue queue, since we don't want
4004 * compression/checksumming/etc. work to prevent our (cheap) IO reissue.
4006 if (zio
->io_error
&& vd
== NULL
&&
4007 !(zio
->io_flags
& (ZIO_FLAG_DONT_RETRY
| ZIO_FLAG_IO_RETRY
))) {
4008 ASSERT(!(zio
->io_flags
& ZIO_FLAG_DONT_QUEUE
)); /* not a leaf */
4009 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_BYPASS
)); /* not a leaf */
4011 zio
->io_flags
|= ZIO_FLAG_IO_RETRY
|
4012 ZIO_FLAG_DONT_CACHE
| ZIO_FLAG_DONT_AGGREGATE
;
4013 zio
->io_stage
= ZIO_STAGE_VDEV_IO_START
>> 1;
4014 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
,
4015 zio_requeue_io_start_cut_in_line
);
4020 * If we got an error on a leaf device, convert it to ENXIO
4021 * if the device is not accessible at all.
4023 if (zio
->io_error
&& vd
!= NULL
&& vd
->vdev_ops
->vdev_op_leaf
&&
4024 !vdev_accessible(vd
, zio
))
4025 zio
->io_error
= SET_ERROR(ENXIO
);
4028 * If we can't write to an interior vdev (mirror or RAID-Z),
4029 * set vdev_cant_write so that we stop trying to allocate from it.
4031 if (zio
->io_error
== ENXIO
&& zio
->io_type
== ZIO_TYPE_WRITE
&&
4032 vd
!= NULL
&& !vd
->vdev_ops
->vdev_op_leaf
) {
4033 vdev_dbgmsg(vd
, "zio_vdev_io_assess(zio=%px) setting "
4034 "cant_write=TRUE due to write failure with ENXIO",
4036 vd
->vdev_cant_write
= B_TRUE
;
4040 * If a cache flush returns ENOTSUP or ENOTTY, we know that no future
4041 * attempts will ever succeed. In this case we set a persistent
4042 * boolean flag so that we don't bother with it in the future.
4044 if ((zio
->io_error
== ENOTSUP
|| zio
->io_error
== ENOTTY
) &&
4045 zio
->io_type
== ZIO_TYPE_IOCTL
&&
4046 zio
->io_cmd
== DKIOCFLUSHWRITECACHE
&& vd
!= NULL
)
4047 vd
->vdev_nowritecache
= B_TRUE
;
4050 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
4052 if (vd
!= NULL
&& vd
->vdev_ops
->vdev_op_leaf
&&
4053 zio
->io_physdone
!= NULL
) {
4054 ASSERT(!(zio
->io_flags
& ZIO_FLAG_DELEGATED
));
4055 ASSERT(zio
->io_child_type
== ZIO_CHILD_VDEV
);
4056 zio
->io_physdone(zio
->io_logical
);
4063 zio_vdev_io_reissue(zio_t
*zio
)
4065 ASSERT(zio
->io_stage
== ZIO_STAGE_VDEV_IO_START
);
4066 ASSERT(zio
->io_error
== 0);
4068 zio
->io_stage
>>= 1;
4072 zio_vdev_io_redone(zio_t
*zio
)
4074 ASSERT(zio
->io_stage
== ZIO_STAGE_VDEV_IO_DONE
);
4076 zio
->io_stage
>>= 1;
4080 zio_vdev_io_bypass(zio_t
*zio
)
4082 ASSERT(zio
->io_stage
== ZIO_STAGE_VDEV_IO_START
);
4083 ASSERT(zio
->io_error
== 0);
4085 zio
->io_flags
|= ZIO_FLAG_IO_BYPASS
;
4086 zio
->io_stage
= ZIO_STAGE_VDEV_IO_ASSESS
>> 1;
4090 * ==========================================================================
4091 * Encrypt and store encryption parameters
4092 * ==========================================================================
4097 * This function is used for ZIO_STAGE_ENCRYPT. It is responsible for
4098 * managing the storage of encryption parameters and passing them to the
4099 * lower-level encryption functions.
4102 zio_encrypt(zio_t
*zio
)
4104 zio_prop_t
*zp
= &zio
->io_prop
;
4105 spa_t
*spa
= zio
->io_spa
;
4106 blkptr_t
*bp
= zio
->io_bp
;
4107 uint64_t psize
= BP_GET_PSIZE(bp
);
4108 uint64_t dsobj
= zio
->io_bookmark
.zb_objset
;
4109 dmu_object_type_t ot
= BP_GET_TYPE(bp
);
4110 void *enc_buf
= NULL
;
4112 uint8_t salt
[ZIO_DATA_SALT_LEN
];
4113 uint8_t iv
[ZIO_DATA_IV_LEN
];
4114 uint8_t mac
[ZIO_DATA_MAC_LEN
];
4115 boolean_t no_crypt
= B_FALSE
;
4117 /* the root zio already encrypted the data */
4118 if (zio
->io_child_type
== ZIO_CHILD_GANG
)
4121 /* only ZIL blocks are re-encrypted on rewrite */
4122 if (!IO_IS_ALLOCATING(zio
) && ot
!= DMU_OT_INTENT_LOG
)
4125 if (!(zp
->zp_encrypt
|| BP_IS_ENCRYPTED(bp
))) {
4126 BP_SET_CRYPT(bp
, B_FALSE
);
4130 /* if we are doing raw encryption set the provided encryption params */
4131 if (zio
->io_flags
& ZIO_FLAG_RAW_ENCRYPT
) {
4132 ASSERT0(BP_GET_LEVEL(bp
));
4133 BP_SET_CRYPT(bp
, B_TRUE
);
4134 BP_SET_BYTEORDER(bp
, zp
->zp_byteorder
);
4135 if (ot
!= DMU_OT_OBJSET
)
4136 zio_crypt_encode_mac_bp(bp
, zp
->zp_mac
);
4138 /* dnode blocks must be written out in the provided byteorder */
4139 if (zp
->zp_byteorder
!= ZFS_HOST_BYTEORDER
&&
4140 ot
== DMU_OT_DNODE
) {
4141 void *bswap_buf
= zio_buf_alloc(psize
);
4142 abd_t
*babd
= abd_get_from_buf(bswap_buf
, psize
);
4144 ASSERT3U(BP_GET_COMPRESS(bp
), ==, ZIO_COMPRESS_OFF
);
4145 abd_copy_to_buf(bswap_buf
, zio
->io_abd
, psize
);
4146 dmu_ot_byteswap
[DMU_OT_BYTESWAP(ot
)].ob_func(bswap_buf
,
4149 abd_take_ownership_of_buf(babd
, B_TRUE
);
4150 zio_push_transform(zio
, babd
, psize
, psize
, NULL
);
4153 if (DMU_OT_IS_ENCRYPTED(ot
))
4154 zio_crypt_encode_params_bp(bp
, zp
->zp_salt
, zp
->zp_iv
);
4158 /* indirect blocks only maintain a cksum of the lower level MACs */
4159 if (BP_GET_LEVEL(bp
) > 0) {
4160 BP_SET_CRYPT(bp
, B_TRUE
);
4161 VERIFY0(zio_crypt_do_indirect_mac_checksum_abd(B_TRUE
,
4162 zio
->io_orig_abd
, BP_GET_LSIZE(bp
), BP_SHOULD_BYTESWAP(bp
),
4164 zio_crypt_encode_mac_bp(bp
, mac
);
4169 * Objset blocks are a special case since they have 2 256-bit MACs
4170 * embedded within them.
4172 if (ot
== DMU_OT_OBJSET
) {
4173 ASSERT0(DMU_OT_IS_ENCRYPTED(ot
));
4174 ASSERT3U(BP_GET_COMPRESS(bp
), ==, ZIO_COMPRESS_OFF
);
4175 BP_SET_CRYPT(bp
, B_TRUE
);
4176 VERIFY0(spa_do_crypt_objset_mac_abd(B_TRUE
, spa
, dsobj
,
4177 zio
->io_abd
, psize
, BP_SHOULD_BYTESWAP(bp
)));
4181 /* unencrypted object types are only authenticated with a MAC */
4182 if (!DMU_OT_IS_ENCRYPTED(ot
)) {
4183 BP_SET_CRYPT(bp
, B_TRUE
);
4184 VERIFY0(spa_do_crypt_mac_abd(B_TRUE
, spa
, dsobj
,
4185 zio
->io_abd
, psize
, mac
));
4186 zio_crypt_encode_mac_bp(bp
, mac
);
4191 * Later passes of sync-to-convergence may decide to rewrite data
4192 * in place to avoid more disk reallocations. This presents a problem
4193 * for encryption because this constitutes rewriting the new data with
4194 * the same encryption key and IV. However, this only applies to blocks
4195 * in the MOS (particularly the spacemaps) and we do not encrypt the
4196 * MOS. We assert that the zio is allocating or an intent log write
4199 ASSERT(IO_IS_ALLOCATING(zio
) || ot
== DMU_OT_INTENT_LOG
);
4200 ASSERT(BP_GET_LEVEL(bp
) == 0 || ot
== DMU_OT_INTENT_LOG
);
4201 ASSERT(spa_feature_is_active(spa
, SPA_FEATURE_ENCRYPTION
));
4202 ASSERT3U(psize
, !=, 0);
4204 enc_buf
= zio_buf_alloc(psize
);
4205 eabd
= abd_get_from_buf(enc_buf
, psize
);
4206 abd_take_ownership_of_buf(eabd
, B_TRUE
);
4209 * For an explanation of what encryption parameters are stored
4210 * where, see the block comment in zio_crypt.c.
4212 if (ot
== DMU_OT_INTENT_LOG
) {
4213 zio_crypt_decode_params_bp(bp
, salt
, iv
);
4215 BP_SET_CRYPT(bp
, B_TRUE
);
4218 /* Perform the encryption. This should not fail */
4219 VERIFY0(spa_do_crypt_abd(B_TRUE
, spa
, &zio
->io_bookmark
,
4220 BP_GET_TYPE(bp
), BP_GET_DEDUP(bp
), BP_SHOULD_BYTESWAP(bp
),
4221 salt
, iv
, mac
, psize
, zio
->io_abd
, eabd
, &no_crypt
));
4223 /* encode encryption metadata into the bp */
4224 if (ot
== DMU_OT_INTENT_LOG
) {
4226 * ZIL blocks store the MAC in the embedded checksum, so the
4227 * transform must always be applied.
4229 zio_crypt_encode_mac_zil(enc_buf
, mac
);
4230 zio_push_transform(zio
, eabd
, psize
, psize
, NULL
);
4232 BP_SET_CRYPT(bp
, B_TRUE
);
4233 zio_crypt_encode_params_bp(bp
, salt
, iv
);
4234 zio_crypt_encode_mac_bp(bp
, mac
);
4237 ASSERT3U(ot
, ==, DMU_OT_DNODE
);
4240 zio_push_transform(zio
, eabd
, psize
, psize
, NULL
);
4248 * ==========================================================================
4249 * Generate and verify checksums
4250 * ==========================================================================
4253 zio_checksum_generate(zio_t
*zio
)
4255 blkptr_t
*bp
= zio
->io_bp
;
4256 enum zio_checksum checksum
;
4260 * This is zio_write_phys().
4261 * We're either generating a label checksum, or none at all.
4263 checksum
= zio
->io_prop
.zp_checksum
;
4265 if (checksum
== ZIO_CHECKSUM_OFF
)
4268 ASSERT(checksum
== ZIO_CHECKSUM_LABEL
);
4270 if (BP_IS_GANG(bp
) && zio
->io_child_type
== ZIO_CHILD_GANG
) {
4271 ASSERT(!IO_IS_ALLOCATING(zio
));
4272 checksum
= ZIO_CHECKSUM_GANG_HEADER
;
4274 checksum
= BP_GET_CHECKSUM(bp
);
4278 zio_checksum_compute(zio
, checksum
, zio
->io_abd
, zio
->io_size
);
4284 zio_checksum_verify(zio_t
*zio
)
4286 zio_bad_cksum_t info
;
4287 blkptr_t
*bp
= zio
->io_bp
;
4290 ASSERT(zio
->io_vd
!= NULL
);
4294 * This is zio_read_phys().
4295 * We're either verifying a label checksum, or nothing at all.
4297 if (zio
->io_prop
.zp_checksum
== ZIO_CHECKSUM_OFF
)
4300 ASSERT3U(zio
->io_prop
.zp_checksum
, ==, ZIO_CHECKSUM_LABEL
);
4303 if ((error
= zio_checksum_error(zio
, &info
)) != 0) {
4304 zio
->io_error
= error
;
4305 if (error
== ECKSUM
&&
4306 !(zio
->io_flags
& ZIO_FLAG_SPECULATIVE
)) {
4307 (void) zfs_ereport_start_checksum(zio
->io_spa
,
4308 zio
->io_vd
, &zio
->io_bookmark
, zio
,
4309 zio
->io_offset
, zio
->io_size
, &info
);
4310 mutex_enter(&zio
->io_vd
->vdev_stat_lock
);
4311 zio
->io_vd
->vdev_stat
.vs_checksum_errors
++;
4312 mutex_exit(&zio
->io_vd
->vdev_stat_lock
);
4320 * Called by RAID-Z to ensure we don't compute the checksum twice.
4323 zio_checksum_verified(zio_t
*zio
)
4325 zio
->io_pipeline
&= ~ZIO_STAGE_CHECKSUM_VERIFY
;
4329 * ==========================================================================
4330 * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other.
4331 * An error of 0 indicates success. ENXIO indicates whole-device failure,
4332 * which may be transient (e.g. unplugged) or permanent. ECKSUM and EIO
4333 * indicate errors that are specific to one I/O, and most likely permanent.
4334 * Any other error is presumed to be worse because we weren't expecting it.
4335 * ==========================================================================
4338 zio_worst_error(int e1
, int e2
)
4340 static int zio_error_rank
[] = { 0, ENXIO
, ECKSUM
, EIO
};
4343 for (r1
= 0; r1
< sizeof (zio_error_rank
) / sizeof (int); r1
++)
4344 if (e1
== zio_error_rank
[r1
])
4347 for (r2
= 0; r2
< sizeof (zio_error_rank
) / sizeof (int); r2
++)
4348 if (e2
== zio_error_rank
[r2
])
4351 return (r1
> r2
? e1
: e2
);
4355 * ==========================================================================
4357 * ==========================================================================
4360 zio_ready(zio_t
*zio
)
4362 blkptr_t
*bp
= zio
->io_bp
;
4363 zio_t
*pio
, *pio_next
;
4364 zio_link_t
*zl
= NULL
;
4366 if (zio_wait_for_children(zio
, ZIO_CHILD_GANG_BIT
| ZIO_CHILD_DDT_BIT
,
4371 if (zio
->io_ready
) {
4372 ASSERT(IO_IS_ALLOCATING(zio
));
4373 ASSERT(bp
->blk_birth
== zio
->io_txg
|| BP_IS_HOLE(bp
) ||
4374 (zio
->io_flags
& ZIO_FLAG_NOPWRITE
));
4375 ASSERT(zio
->io_children
[ZIO_CHILD_GANG
][ZIO_WAIT_READY
] == 0);
4380 if (bp
!= NULL
&& bp
!= &zio
->io_bp_copy
)
4381 zio
->io_bp_copy
= *bp
;
4383 if (zio
->io_error
!= 0) {
4384 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
4386 if (zio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
) {
4387 ASSERT(IO_IS_ALLOCATING(zio
));
4388 ASSERT(zio
->io_priority
== ZIO_PRIORITY_ASYNC_WRITE
);
4389 ASSERT(zio
->io_metaslab_class
!= NULL
);
4392 * We were unable to allocate anything, unreserve and
4393 * issue the next I/O to allocate.
4395 metaslab_class_throttle_unreserve(
4396 zio
->io_metaslab_class
, zio
->io_prop
.zp_copies
,
4397 zio
->io_allocator
, zio
);
4398 zio_allocate_dispatch(zio
->io_spa
, zio
->io_allocator
);
4402 mutex_enter(&zio
->io_lock
);
4403 zio
->io_state
[ZIO_WAIT_READY
] = 1;
4404 pio
= zio_walk_parents(zio
, &zl
);
4405 mutex_exit(&zio
->io_lock
);
4408 * As we notify zio's parents, new parents could be added.
4409 * New parents go to the head of zio's io_parent_list, however,
4410 * so we will (correctly) not notify them. The remainder of zio's
4411 * io_parent_list, from 'pio_next' onward, cannot change because
4412 * all parents must wait for us to be done before they can be done.
4414 for (; pio
!= NULL
; pio
= pio_next
) {
4415 pio_next
= zio_walk_parents(zio
, &zl
);
4416 zio_notify_parent(pio
, zio
, ZIO_WAIT_READY
, NULL
);
4419 if (zio
->io_flags
& ZIO_FLAG_NODATA
) {
4420 if (BP_IS_GANG(bp
)) {
4421 zio
->io_flags
&= ~ZIO_FLAG_NODATA
;
4423 ASSERT((uintptr_t)zio
->io_abd
< SPA_MAXBLOCKSIZE
);
4424 zio
->io_pipeline
&= ~ZIO_VDEV_IO_STAGES
;
4428 if (zio_injection_enabled
&&
4429 zio
->io_spa
->spa_syncing_txg
== zio
->io_txg
)
4430 zio_handle_ignored_writes(zio
);
4436 * Update the allocation throttle accounting.
4439 zio_dva_throttle_done(zio_t
*zio
)
4441 zio_t
*lio __maybe_unused
= zio
->io_logical
;
4442 zio_t
*pio
= zio_unique_parent(zio
);
4443 vdev_t
*vd
= zio
->io_vd
;
4444 int flags
= METASLAB_ASYNC_ALLOC
;
4446 ASSERT3P(zio
->io_bp
, !=, NULL
);
4447 ASSERT3U(zio
->io_type
, ==, ZIO_TYPE_WRITE
);
4448 ASSERT3U(zio
->io_priority
, ==, ZIO_PRIORITY_ASYNC_WRITE
);
4449 ASSERT3U(zio
->io_child_type
, ==, ZIO_CHILD_VDEV
);
4451 ASSERT3P(vd
, ==, vd
->vdev_top
);
4452 ASSERT(zio_injection_enabled
|| !(zio
->io_flags
& ZIO_FLAG_IO_RETRY
));
4453 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_REPAIR
));
4454 ASSERT(zio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
);
4455 ASSERT(!(lio
->io_flags
& ZIO_FLAG_IO_REWRITE
));
4456 ASSERT(!(lio
->io_orig_flags
& ZIO_FLAG_NODATA
));
4459 * Parents of gang children can have two flavors -- ones that
4460 * allocated the gang header (will have ZIO_FLAG_IO_REWRITE set)
4461 * and ones that allocated the constituent blocks. The allocation
4462 * throttle needs to know the allocating parent zio so we must find
4465 if (pio
->io_child_type
== ZIO_CHILD_GANG
) {
4467 * If our parent is a rewrite gang child then our grandparent
4468 * would have been the one that performed the allocation.
4470 if (pio
->io_flags
& ZIO_FLAG_IO_REWRITE
)
4471 pio
= zio_unique_parent(pio
);
4472 flags
|= METASLAB_GANG_CHILD
;
4475 ASSERT(IO_IS_ALLOCATING(pio
));
4476 ASSERT3P(zio
, !=, zio
->io_logical
);
4477 ASSERT(zio
->io_logical
!= NULL
);
4478 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_REPAIR
));
4479 ASSERT0(zio
->io_flags
& ZIO_FLAG_NOPWRITE
);
4480 ASSERT(zio
->io_metaslab_class
!= NULL
);
4482 mutex_enter(&pio
->io_lock
);
4483 metaslab_group_alloc_decrement(zio
->io_spa
, vd
->vdev_id
, pio
, flags
,
4484 pio
->io_allocator
, B_TRUE
);
4485 mutex_exit(&pio
->io_lock
);
4487 metaslab_class_throttle_unreserve(zio
->io_metaslab_class
, 1,
4488 pio
->io_allocator
, pio
);
4491 * Call into the pipeline to see if there is more work that
4492 * needs to be done. If there is work to be done it will be
4493 * dispatched to another taskq thread.
4495 zio_allocate_dispatch(zio
->io_spa
, pio
->io_allocator
);
4499 zio_done(zio_t
*zio
)
4502 * Always attempt to keep stack usage minimal here since
4503 * we can be called recursively up to 19 levels deep.
4505 const uint64_t psize
= zio
->io_size
;
4506 zio_t
*pio
, *pio_next
;
4507 zio_link_t
*zl
= NULL
;
4510 * If our children haven't all completed,
4511 * wait for them and then repeat this pipeline stage.
4513 if (zio_wait_for_children(zio
, ZIO_CHILD_ALL_BITS
, ZIO_WAIT_DONE
)) {
4518 * If the allocation throttle is enabled, then update the accounting.
4519 * We only track child I/Os that are part of an allocating async
4520 * write. We must do this since the allocation is performed
4521 * by the logical I/O but the actual write is done by child I/Os.
4523 if (zio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
&&
4524 zio
->io_child_type
== ZIO_CHILD_VDEV
) {
4525 ASSERT(zio
->io_metaslab_class
!= NULL
);
4526 ASSERT(zio
->io_metaslab_class
->mc_alloc_throttle_enabled
);
4527 zio_dva_throttle_done(zio
);
4531 * If the allocation throttle is enabled, verify that
4532 * we have decremented the refcounts for every I/O that was throttled.
4534 if (zio
->io_flags
& ZIO_FLAG_IO_ALLOCATING
) {
4535 ASSERT(zio
->io_type
== ZIO_TYPE_WRITE
);
4536 ASSERT(zio
->io_priority
== ZIO_PRIORITY_ASYNC_WRITE
);
4537 ASSERT(zio
->io_bp
!= NULL
);
4539 metaslab_group_alloc_verify(zio
->io_spa
, zio
->io_bp
, zio
,
4541 VERIFY(zfs_refcount_not_held(&zio
->io_metaslab_class
->
4542 mc_allocator
[zio
->io_allocator
].mca_alloc_slots
, zio
));
4546 for (int c
= 0; c
< ZIO_CHILD_TYPES
; c
++)
4547 for (int w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
4548 ASSERT(zio
->io_children
[c
][w
] == 0);
4550 if (zio
->io_bp
!= NULL
&& !BP_IS_EMBEDDED(zio
->io_bp
)) {
4551 ASSERT(zio
->io_bp
->blk_pad
[0] == 0);
4552 ASSERT(zio
->io_bp
->blk_pad
[1] == 0);
4553 ASSERT(memcmp(zio
->io_bp
, &zio
->io_bp_copy
,
4554 sizeof (blkptr_t
)) == 0 ||
4555 (zio
->io_bp
== zio_unique_parent(zio
)->io_bp
));
4556 if (zio
->io_type
== ZIO_TYPE_WRITE
&& !BP_IS_HOLE(zio
->io_bp
) &&
4557 zio
->io_bp_override
== NULL
&&
4558 !(zio
->io_flags
& ZIO_FLAG_IO_REPAIR
)) {
4559 ASSERT3U(zio
->io_prop
.zp_copies
, <=,
4560 BP_GET_NDVAS(zio
->io_bp
));
4561 ASSERT(BP_COUNT_GANG(zio
->io_bp
) == 0 ||
4562 (BP_COUNT_GANG(zio
->io_bp
) ==
4563 BP_GET_NDVAS(zio
->io_bp
)));
4565 if (zio
->io_flags
& ZIO_FLAG_NOPWRITE
)
4566 VERIFY(BP_EQUAL(zio
->io_bp
, &zio
->io_bp_orig
));
4570 * If there were child vdev/gang/ddt errors, they apply to us now.
4572 zio_inherit_child_errors(zio
, ZIO_CHILD_VDEV
);
4573 zio_inherit_child_errors(zio
, ZIO_CHILD_GANG
);
4574 zio_inherit_child_errors(zio
, ZIO_CHILD_DDT
);
4577 * If the I/O on the transformed data was successful, generate any
4578 * checksum reports now while we still have the transformed data.
4580 if (zio
->io_error
== 0) {
4581 while (zio
->io_cksum_report
!= NULL
) {
4582 zio_cksum_report_t
*zcr
= zio
->io_cksum_report
;
4583 uint64_t align
= zcr
->zcr_align
;
4584 uint64_t asize
= P2ROUNDUP(psize
, align
);
4585 abd_t
*adata
= zio
->io_abd
;
4587 if (adata
!= NULL
&& asize
!= psize
) {
4588 adata
= abd_alloc(asize
, B_TRUE
);
4589 abd_copy(adata
, zio
->io_abd
, psize
);
4590 abd_zero_off(adata
, psize
, asize
- psize
);
4593 zio
->io_cksum_report
= zcr
->zcr_next
;
4594 zcr
->zcr_next
= NULL
;
4595 zcr
->zcr_finish(zcr
, adata
);
4596 zfs_ereport_free_checksum(zcr
);
4598 if (adata
!= NULL
&& asize
!= psize
)
4603 zio_pop_transforms(zio
); /* note: may set zio->io_error */
4605 vdev_stat_update(zio
, psize
);
4608 * If this I/O is attached to a particular vdev is slow, exceeding
4609 * 30 seconds to complete, post an error described the I/O delay.
4610 * We ignore these errors if the device is currently unavailable.
4612 if (zio
->io_delay
>= MSEC2NSEC(zio_slow_io_ms
)) {
4613 if (zio
->io_vd
!= NULL
&& !vdev_is_dead(zio
->io_vd
)) {
4615 * We want to only increment our slow IO counters if
4616 * the IO is valid (i.e. not if the drive is removed).
4618 * zfs_ereport_post() will also do these checks, but
4619 * it can also ratelimit and have other failures, so we
4620 * need to increment the slow_io counters independent
4623 if (zfs_ereport_is_valid(FM_EREPORT_ZFS_DELAY
,
4624 zio
->io_spa
, zio
->io_vd
, zio
)) {
4625 mutex_enter(&zio
->io_vd
->vdev_stat_lock
);
4626 zio
->io_vd
->vdev_stat
.vs_slow_ios
++;
4627 mutex_exit(&zio
->io_vd
->vdev_stat_lock
);
4629 (void) zfs_ereport_post(FM_EREPORT_ZFS_DELAY
,
4630 zio
->io_spa
, zio
->io_vd
, &zio
->io_bookmark
,
4636 if (zio
->io_error
) {
4638 * If this I/O is attached to a particular vdev,
4639 * generate an error message describing the I/O failure
4640 * at the block level. We ignore these errors if the
4641 * device is currently unavailable.
4643 if (zio
->io_error
!= ECKSUM
&& zio
->io_vd
!= NULL
&&
4644 !vdev_is_dead(zio
->io_vd
)) {
4645 int ret
= zfs_ereport_post(FM_EREPORT_ZFS_IO
,
4646 zio
->io_spa
, zio
->io_vd
, &zio
->io_bookmark
, zio
, 0);
4647 if (ret
!= EALREADY
) {
4648 mutex_enter(&zio
->io_vd
->vdev_stat_lock
);
4649 if (zio
->io_type
== ZIO_TYPE_READ
)
4650 zio
->io_vd
->vdev_stat
.vs_read_errors
++;
4651 else if (zio
->io_type
== ZIO_TYPE_WRITE
)
4652 zio
->io_vd
->vdev_stat
.vs_write_errors
++;
4653 mutex_exit(&zio
->io_vd
->vdev_stat_lock
);
4657 if ((zio
->io_error
== EIO
|| !(zio
->io_flags
&
4658 (ZIO_FLAG_SPECULATIVE
| ZIO_FLAG_DONT_PROPAGATE
))) &&
4659 zio
== zio
->io_logical
) {
4661 * For logical I/O requests, tell the SPA to log the
4662 * error and generate a logical data ereport.
4664 spa_log_error(zio
->io_spa
, &zio
->io_bookmark
);
4665 (void) zfs_ereport_post(FM_EREPORT_ZFS_DATA
,
4666 zio
->io_spa
, NULL
, &zio
->io_bookmark
, zio
, 0);
4670 if (zio
->io_error
&& zio
== zio
->io_logical
) {
4672 * Determine whether zio should be reexecuted. This will
4673 * propagate all the way to the root via zio_notify_parent().
4675 ASSERT(zio
->io_vd
== NULL
&& zio
->io_bp
!= NULL
);
4676 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
4678 if (IO_IS_ALLOCATING(zio
) &&
4679 !(zio
->io_flags
& ZIO_FLAG_CANFAIL
)) {
4680 if (zio
->io_error
!= ENOSPC
)
4681 zio
->io_reexecute
|= ZIO_REEXECUTE_NOW
;
4683 zio
->io_reexecute
|= ZIO_REEXECUTE_SUSPEND
;
4686 if ((zio
->io_type
== ZIO_TYPE_READ
||
4687 zio
->io_type
== ZIO_TYPE_FREE
) &&
4688 !(zio
->io_flags
& ZIO_FLAG_SCAN_THREAD
) &&
4689 zio
->io_error
== ENXIO
&&
4690 spa_load_state(zio
->io_spa
) == SPA_LOAD_NONE
&&
4691 spa_get_failmode(zio
->io_spa
) != ZIO_FAILURE_MODE_CONTINUE
)
4692 zio
->io_reexecute
|= ZIO_REEXECUTE_SUSPEND
;
4694 if (!(zio
->io_flags
& ZIO_FLAG_CANFAIL
) && !zio
->io_reexecute
)
4695 zio
->io_reexecute
|= ZIO_REEXECUTE_SUSPEND
;
4698 * Here is a possibly good place to attempt to do
4699 * either combinatorial reconstruction or error correction
4700 * based on checksums. It also might be a good place
4701 * to send out preliminary ereports before we suspend
4707 * If there were logical child errors, they apply to us now.
4708 * We defer this until now to avoid conflating logical child
4709 * errors with errors that happened to the zio itself when
4710 * updating vdev stats and reporting FMA events above.
4712 zio_inherit_child_errors(zio
, ZIO_CHILD_LOGICAL
);
4714 if ((zio
->io_error
|| zio
->io_reexecute
) &&
4715 IO_IS_ALLOCATING(zio
) && zio
->io_gang_leader
== zio
&&
4716 !(zio
->io_flags
& (ZIO_FLAG_IO_REWRITE
| ZIO_FLAG_NOPWRITE
)))
4717 zio_dva_unallocate(zio
, zio
->io_gang_tree
, zio
->io_bp
);
4719 zio_gang_tree_free(&zio
->io_gang_tree
);
4722 * Godfather I/Os should never suspend.
4724 if ((zio
->io_flags
& ZIO_FLAG_GODFATHER
) &&
4725 (zio
->io_reexecute
& ZIO_REEXECUTE_SUSPEND
))
4726 zio
->io_reexecute
&= ~ZIO_REEXECUTE_SUSPEND
;
4728 if (zio
->io_reexecute
) {
4730 * This is a logical I/O that wants to reexecute.
4732 * Reexecute is top-down. When an i/o fails, if it's not
4733 * the root, it simply notifies its parent and sticks around.
4734 * The parent, seeing that it still has children in zio_done(),
4735 * does the same. This percolates all the way up to the root.
4736 * The root i/o will reexecute or suspend the entire tree.
4738 * This approach ensures that zio_reexecute() honors
4739 * all the original i/o dependency relationships, e.g.
4740 * parents not executing until children are ready.
4742 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
4744 zio
->io_gang_leader
= NULL
;
4746 mutex_enter(&zio
->io_lock
);
4747 zio
->io_state
[ZIO_WAIT_DONE
] = 1;
4748 mutex_exit(&zio
->io_lock
);
4751 * "The Godfather" I/O monitors its children but is
4752 * not a true parent to them. It will track them through
4753 * the pipeline but severs its ties whenever they get into
4754 * trouble (e.g. suspended). This allows "The Godfather"
4755 * I/O to return status without blocking.
4758 for (pio
= zio_walk_parents(zio
, &zl
); pio
!= NULL
;
4760 zio_link_t
*remove_zl
= zl
;
4761 pio_next
= zio_walk_parents(zio
, &zl
);
4763 if ((pio
->io_flags
& ZIO_FLAG_GODFATHER
) &&
4764 (zio
->io_reexecute
& ZIO_REEXECUTE_SUSPEND
)) {
4765 zio_remove_child(pio
, zio
, remove_zl
);
4767 * This is a rare code path, so we don't
4768 * bother with "next_to_execute".
4770 zio_notify_parent(pio
, zio
, ZIO_WAIT_DONE
,
4775 if ((pio
= zio_unique_parent(zio
)) != NULL
) {
4777 * We're not a root i/o, so there's nothing to do
4778 * but notify our parent. Don't propagate errors
4779 * upward since we haven't permanently failed yet.
4781 ASSERT(!(zio
->io_flags
& ZIO_FLAG_GODFATHER
));
4782 zio
->io_flags
|= ZIO_FLAG_DONT_PROPAGATE
;
4784 * This is a rare code path, so we don't bother with
4785 * "next_to_execute".
4787 zio_notify_parent(pio
, zio
, ZIO_WAIT_DONE
, NULL
);
4788 } else if (zio
->io_reexecute
& ZIO_REEXECUTE_SUSPEND
) {
4790 * We'd fail again if we reexecuted now, so suspend
4791 * until conditions improve (e.g. device comes online).
4793 zio_suspend(zio
->io_spa
, zio
, ZIO_SUSPEND_IOERR
);
4796 * Reexecution is potentially a huge amount of work.
4797 * Hand it off to the otherwise-unused claim taskq.
4799 ASSERT(taskq_empty_ent(&zio
->io_tqent
));
4800 spa_taskq_dispatch_ent(zio
->io_spa
,
4801 ZIO_TYPE_CLAIM
, ZIO_TASKQ_ISSUE
,
4802 zio_reexecute
, zio
, 0, &zio
->io_tqent
);
4807 ASSERT(zio
->io_child_count
== 0);
4808 ASSERT(zio
->io_reexecute
== 0);
4809 ASSERT(zio
->io_error
== 0 || (zio
->io_flags
& ZIO_FLAG_CANFAIL
));
4812 * Report any checksum errors, since the I/O is complete.
4814 while (zio
->io_cksum_report
!= NULL
) {
4815 zio_cksum_report_t
*zcr
= zio
->io_cksum_report
;
4816 zio
->io_cksum_report
= zcr
->zcr_next
;
4817 zcr
->zcr_next
= NULL
;
4818 zcr
->zcr_finish(zcr
, NULL
);
4819 zfs_ereport_free_checksum(zcr
);
4822 if (zio
->io_flags
& ZIO_FLAG_FASTWRITE
&& zio
->io_bp
&&
4823 !BP_IS_HOLE(zio
->io_bp
) && !BP_IS_EMBEDDED(zio
->io_bp
) &&
4824 !(zio
->io_flags
& ZIO_FLAG_NOPWRITE
)) {
4825 metaslab_fastwrite_unmark(zio
->io_spa
, zio
->io_bp
);
4829 * It is the responsibility of the done callback to ensure that this
4830 * particular zio is no longer discoverable for adoption, and as
4831 * such, cannot acquire any new parents.
4836 mutex_enter(&zio
->io_lock
);
4837 zio
->io_state
[ZIO_WAIT_DONE
] = 1;
4838 mutex_exit(&zio
->io_lock
);
4841 * We are done executing this zio. We may want to execute a parent
4842 * next. See the comment in zio_notify_parent().
4844 zio_t
*next_to_execute
= NULL
;
4846 for (pio
= zio_walk_parents(zio
, &zl
); pio
!= NULL
; pio
= pio_next
) {
4847 zio_link_t
*remove_zl
= zl
;
4848 pio_next
= zio_walk_parents(zio
, &zl
);
4849 zio_remove_child(pio
, zio
, remove_zl
);
4850 zio_notify_parent(pio
, zio
, ZIO_WAIT_DONE
, &next_to_execute
);
4853 if (zio
->io_waiter
!= NULL
) {
4854 mutex_enter(&zio
->io_lock
);
4855 zio
->io_executor
= NULL
;
4856 cv_broadcast(&zio
->io_cv
);
4857 mutex_exit(&zio
->io_lock
);
4862 return (next_to_execute
);
4866 * ==========================================================================
4867 * I/O pipeline definition
4868 * ==========================================================================
4870 static zio_pipe_stage_t
*zio_pipeline
[] = {
4878 zio_checksum_generate
,
4894 zio_checksum_verify
,
4902 * Compare two zbookmark_phys_t's to see which we would reach first in a
4903 * pre-order traversal of the object tree.
4905 * This is simple in every case aside from the meta-dnode object. For all other
4906 * objects, we traverse them in order (object 1 before object 2, and so on).
4907 * However, all of these objects are traversed while traversing object 0, since
4908 * the data it points to is the list of objects. Thus, we need to convert to a
4909 * canonical representation so we can compare meta-dnode bookmarks to
4910 * non-meta-dnode bookmarks.
4912 * We do this by calculating "equivalents" for each field of the zbookmark.
4913 * zbookmarks outside of the meta-dnode use their own object and level, and
4914 * calculate the level 0 equivalent (the first L0 blkid that is contained in the
4915 * blocks this bookmark refers to) by multiplying their blkid by their span
4916 * (the number of L0 blocks contained within one block at their level).
4917 * zbookmarks inside the meta-dnode calculate their object equivalent
4918 * (which is L0equiv * dnodes per data block), use 0 for their L0equiv, and use
4919 * level + 1<<31 (any value larger than a level could ever be) for their level.
4920 * This causes them to always compare before a bookmark in their object
4921 * equivalent, compare appropriately to bookmarks in other objects, and to
4922 * compare appropriately to other bookmarks in the meta-dnode.
4925 zbookmark_compare(uint16_t dbss1
, uint8_t ibs1
, uint16_t dbss2
, uint8_t ibs2
,
4926 const zbookmark_phys_t
*zb1
, const zbookmark_phys_t
*zb2
)
4929 * These variables represent the "equivalent" values for the zbookmark,
4930 * after converting zbookmarks inside the meta dnode to their
4931 * normal-object equivalents.
4933 uint64_t zb1obj
, zb2obj
;
4934 uint64_t zb1L0
, zb2L0
;
4935 uint64_t zb1level
, zb2level
;
4937 if (zb1
->zb_object
== zb2
->zb_object
&&
4938 zb1
->zb_level
== zb2
->zb_level
&&
4939 zb1
->zb_blkid
== zb2
->zb_blkid
)
4942 IMPLY(zb1
->zb_level
> 0, ibs1
>= SPA_MINBLOCKSHIFT
);
4943 IMPLY(zb2
->zb_level
> 0, ibs2
>= SPA_MINBLOCKSHIFT
);
4946 * BP_SPANB calculates the span in blocks.
4948 zb1L0
= (zb1
->zb_blkid
) * BP_SPANB(ibs1
, zb1
->zb_level
);
4949 zb2L0
= (zb2
->zb_blkid
) * BP_SPANB(ibs2
, zb2
->zb_level
);
4951 if (zb1
->zb_object
== DMU_META_DNODE_OBJECT
) {
4952 zb1obj
= zb1L0
* (dbss1
<< (SPA_MINBLOCKSHIFT
- DNODE_SHIFT
));
4954 zb1level
= zb1
->zb_level
+ COMPARE_META_LEVEL
;
4956 zb1obj
= zb1
->zb_object
;
4957 zb1level
= zb1
->zb_level
;
4960 if (zb2
->zb_object
== DMU_META_DNODE_OBJECT
) {
4961 zb2obj
= zb2L0
* (dbss2
<< (SPA_MINBLOCKSHIFT
- DNODE_SHIFT
));
4963 zb2level
= zb2
->zb_level
+ COMPARE_META_LEVEL
;
4965 zb2obj
= zb2
->zb_object
;
4966 zb2level
= zb2
->zb_level
;
4969 /* Now that we have a canonical representation, do the comparison. */
4970 if (zb1obj
!= zb2obj
)
4971 return (zb1obj
< zb2obj
? -1 : 1);
4972 else if (zb1L0
!= zb2L0
)
4973 return (zb1L0
< zb2L0
? -1 : 1);
4974 else if (zb1level
!= zb2level
)
4975 return (zb1level
> zb2level
? -1 : 1);
4977 * This can (theoretically) happen if the bookmarks have the same object
4978 * and level, but different blkids, if the block sizes are not the same.
4979 * There is presently no way to change the indirect block sizes
4985 * This function checks the following: given that last_block is the place that
4986 * our traversal stopped last time, does that guarantee that we've visited
4987 * every node under subtree_root? Therefore, we can't just use the raw output
4988 * of zbookmark_compare. We have to pass in a modified version of
4989 * subtree_root; by incrementing the block id, and then checking whether
4990 * last_block is before or equal to that, we can tell whether or not having
4991 * visited last_block implies that all of subtree_root's children have been
4995 zbookmark_subtree_completed(const dnode_phys_t
*dnp
,
4996 const zbookmark_phys_t
*subtree_root
, const zbookmark_phys_t
*last_block
)
4998 zbookmark_phys_t mod_zb
= *subtree_root
;
5000 ASSERT0(last_block
->zb_level
);
5002 /* The objset_phys_t isn't before anything. */
5007 * We pass in 1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT) for the
5008 * data block size in sectors, because that variable is only used if
5009 * the bookmark refers to a block in the meta-dnode. Since we don't
5010 * know without examining it what object it refers to, and there's no
5011 * harm in passing in this value in other cases, we always pass it in.
5013 * We pass in 0 for the indirect block size shift because zb2 must be
5014 * level 0. The indirect block size is only used to calculate the span
5015 * of the bookmark, but since the bookmark must be level 0, the span is
5016 * always 1, so the math works out.
5018 * If you make changes to how the zbookmark_compare code works, be sure
5019 * to make sure that this code still works afterwards.
5021 return (zbookmark_compare(dnp
->dn_datablkszsec
, dnp
->dn_indblkshift
,
5022 1ULL << (DNODE_BLOCK_SHIFT
- SPA_MINBLOCKSHIFT
), 0, &mod_zb
,
5027 * This function is similar to zbookmark_subtree_completed(), but returns true
5028 * if subtree_root is equal or ahead of last_block, i.e. still to be done.
5031 zbookmark_subtree_tbd(const dnode_phys_t
*dnp
,
5032 const zbookmark_phys_t
*subtree_root
, const zbookmark_phys_t
*last_block
)
5034 ASSERT0(last_block
->zb_level
);
5037 return (zbookmark_compare(dnp
->dn_datablkszsec
, dnp
->dn_indblkshift
,
5038 1ULL << (DNODE_BLOCK_SHIFT
- SPA_MINBLOCKSHIFT
), 0, subtree_root
,
5042 EXPORT_SYMBOL(zio_type_name
);
5043 EXPORT_SYMBOL(zio_buf_alloc
);
5044 EXPORT_SYMBOL(zio_data_buf_alloc
);
5045 EXPORT_SYMBOL(zio_buf_free
);
5046 EXPORT_SYMBOL(zio_data_buf_free
);
5048 ZFS_MODULE_PARAM(zfs_zio
, zio_
, slow_io_ms
, INT
, ZMOD_RW
,
5049 "Max I/O completion time (milliseconds) before marking it as slow");
5051 ZFS_MODULE_PARAM(zfs_zio
, zio_
, requeue_io_start_cut_in_line
, INT
, ZMOD_RW
,
5052 "Prioritize requeued I/O");
5054 ZFS_MODULE_PARAM(zfs
, zfs_
, sync_pass_deferred_free
, INT
, ZMOD_RW
,
5055 "Defer frees starting in this pass");
5057 ZFS_MODULE_PARAM(zfs
, zfs_
, sync_pass_dont_compress
, INT
, ZMOD_RW
,
5058 "Don't compress starting in this pass");
5060 ZFS_MODULE_PARAM(zfs
, zfs_
, sync_pass_rewrite
, INT
, ZMOD_RW
,
5061 "Rewrite new bps starting in this pass");
5063 ZFS_MODULE_PARAM(zfs_zio
, zio_
, dva_throttle_enabled
, INT
, ZMOD_RW
,
5064 "Throttle block allocations in the ZIO pipeline");
5066 ZFS_MODULE_PARAM(zfs_zio
, zio_
, deadman_log_all
, INT
, ZMOD_RW
,
5067 "Log all slow ZIOs, not just those with vdevs");