4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012 by Delphix. All rights reserved.
24 * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
27 #include <sys/zfs_context.h>
28 #include <sys/fm/fs/zfs.h>
31 #include <sys/spa_impl.h>
32 #include <sys/vdev_impl.h>
33 #include <sys/zio_impl.h>
34 #include <sys/zio_compress.h>
35 #include <sys/zio_checksum.h>
36 #include <sys/dmu_objset.h>
41 * ==========================================================================
43 * ==========================================================================
45 uint8_t zio_priority_table
[ZIO_PRIORITY_TABLE_SIZE
] = {
46 0, /* ZIO_PRIORITY_NOW */
47 0, /* ZIO_PRIORITY_SYNC_READ */
48 0, /* ZIO_PRIORITY_SYNC_WRITE */
49 0, /* ZIO_PRIORITY_LOG_WRITE */
50 1, /* ZIO_PRIORITY_CACHE_FILL */
51 1, /* ZIO_PRIORITY_AGG */
52 4, /* ZIO_PRIORITY_FREE */
53 4, /* ZIO_PRIORITY_ASYNC_WRITE */
54 6, /* ZIO_PRIORITY_ASYNC_READ */
55 10, /* ZIO_PRIORITY_RESILVER */
56 20, /* ZIO_PRIORITY_SCRUB */
57 2, /* ZIO_PRIORITY_DDT_PREFETCH */
61 * ==========================================================================
62 * I/O type descriptions
63 * ==========================================================================
65 char *zio_type_name
[ZIO_TYPES
] = {
66 "z_null", "z_rd", "z_wr", "z_fr", "z_cl", "z_ioctl"
70 * ==========================================================================
72 * ==========================================================================
74 kmem_cache_t
*zio_cache
;
75 kmem_cache_t
*zio_link_cache
;
76 kmem_cache_t
*zio_vdev_cache
;
77 kmem_cache_t
*zio_buf_cache
[SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
];
78 kmem_cache_t
*zio_data_buf_cache
[SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
];
79 int zio_bulk_flags
= 0;
80 int zio_delay_max
= ZIO_DELAY_MAX
;
82 extern int zfs_mg_alloc_failures
;
85 * The following actions directly effect the spa's sync-to-convergence logic.
86 * The values below define the sync pass when we start performing the action.
87 * Care should be taken when changing these values as they directly impact
88 * spa_sync() performance. Tuning these values may introduce subtle performance
89 * pathologies and should only be done in the context of performance analysis.
90 * These tunables will eventually be removed and replaced with #defines once
91 * enough analysis has been done to determine optimal values.
93 * The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that
94 * regular blocks are not deferred.
96 int zfs_sync_pass_deferred_free
= 2; /* defer frees starting in this pass */
97 int zfs_sync_pass_dont_compress
= 5; /* don't compress starting in this pass */
98 int zfs_sync_pass_rewrite
= 2; /* rewrite new bps starting in this pass */
101 * An allocating zio is one that either currently has the DVA allocate
102 * stage set or will have it later in its lifetime.
104 #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE)
106 int zio_requeue_io_start_cut_in_line
= 1;
109 int zio_buf_debug_limit
= 16384;
111 int zio_buf_debug_limit
= 0;
114 static inline void __zio_execute(zio_t
*zio
);
117 zio_cons(void *arg
, void *unused
, int kmflag
)
121 bzero(zio
, sizeof (zio_t
));
123 mutex_init(&zio
->io_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
124 cv_init(&zio
->io_cv
, NULL
, CV_DEFAULT
, NULL
);
126 list_create(&zio
->io_parent_list
, sizeof (zio_link_t
),
127 offsetof(zio_link_t
, zl_parent_node
));
128 list_create(&zio
->io_child_list
, sizeof (zio_link_t
),
129 offsetof(zio_link_t
, zl_child_node
));
135 zio_dest(void *arg
, void *unused
)
139 mutex_destroy(&zio
->io_lock
);
140 cv_destroy(&zio
->io_cv
);
141 list_destroy(&zio
->io_parent_list
);
142 list_destroy(&zio
->io_child_list
);
149 vmem_t
*data_alloc_arena
= NULL
;
151 zio_cache
= kmem_cache_create("zio_cache", sizeof (zio_t
), 0,
152 zio_cons
, zio_dest
, NULL
, NULL
, NULL
, KMC_KMEM
);
153 zio_link_cache
= kmem_cache_create("zio_link_cache",
154 sizeof (zio_link_t
), 0, NULL
, NULL
, NULL
, NULL
, NULL
, KMC_KMEM
);
155 zio_vdev_cache
= kmem_cache_create("zio_vdev_cache", sizeof(vdev_io_t
),
156 PAGESIZE
, NULL
, NULL
, NULL
, NULL
, NULL
, KMC_VMEM
);
159 * For small buffers, we want a cache for each multiple of
160 * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache
161 * for each quarter-power of 2. For large buffers, we want
162 * a cache for each multiple of PAGESIZE.
164 for (c
= 0; c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
; c
++) {
165 size_t size
= (c
+ 1) << SPA_MINBLOCKSHIFT
;
169 while (p2
& (p2
- 1))
172 if (size
<= 4 * SPA_MINBLOCKSIZE
) {
173 align
= SPA_MINBLOCKSIZE
;
174 } else if (P2PHASE(size
, PAGESIZE
) == 0) {
176 } else if (P2PHASE(size
, p2
>> 2) == 0) {
182 int flags
= zio_bulk_flags
;
185 * The smallest buffers (512b) are heavily used and
186 * experience a lot of churn. The slabs allocated
187 * for them are also relatively small (32K). Thus
188 * in over to avoid expensive calls to vmalloc() we
189 * make an exception to the usual slab allocation
190 * policy and force these buffers to be kmem backed.
192 if (size
== (1 << SPA_MINBLOCKSHIFT
))
195 (void) sprintf(name
, "zio_buf_%lu", (ulong_t
)size
);
196 zio_buf_cache
[c
] = kmem_cache_create(name
, size
,
197 align
, NULL
, NULL
, NULL
, NULL
, NULL
, flags
);
199 (void) sprintf(name
, "zio_data_buf_%lu", (ulong_t
)size
);
200 zio_data_buf_cache
[c
] = kmem_cache_create(name
, size
,
201 align
, NULL
, NULL
, NULL
, NULL
,
202 data_alloc_arena
, flags
);
207 ASSERT(zio_buf_cache
[c
] != NULL
);
208 if (zio_buf_cache
[c
- 1] == NULL
)
209 zio_buf_cache
[c
- 1] = zio_buf_cache
[c
];
211 ASSERT(zio_data_buf_cache
[c
] != NULL
);
212 if (zio_data_buf_cache
[c
- 1] == NULL
)
213 zio_data_buf_cache
[c
- 1] = zio_data_buf_cache
[c
];
217 * The zio write taskqs have 1 thread per cpu, allow 1/2 of the taskqs
218 * to fail 3 times per txg or 8 failures, whichever is greater.
220 zfs_mg_alloc_failures
= MAX((3 * max_ncpus
/ 2), 8);
231 kmem_cache_t
*last_cache
= NULL
;
232 kmem_cache_t
*last_data_cache
= NULL
;
234 for (c
= 0; c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
; c
++) {
235 if (zio_buf_cache
[c
] != last_cache
) {
236 last_cache
= zio_buf_cache
[c
];
237 kmem_cache_destroy(zio_buf_cache
[c
]);
239 zio_buf_cache
[c
] = NULL
;
241 if (zio_data_buf_cache
[c
] != last_data_cache
) {
242 last_data_cache
= zio_data_buf_cache
[c
];
243 kmem_cache_destroy(zio_data_buf_cache
[c
]);
245 zio_data_buf_cache
[c
] = NULL
;
248 kmem_cache_destroy(zio_vdev_cache
);
249 kmem_cache_destroy(zio_link_cache
);
250 kmem_cache_destroy(zio_cache
);
258 * ==========================================================================
259 * Allocate and free I/O buffers
260 * ==========================================================================
264 * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a
265 * crashdump if the kernel panics, so use it judiciously. Obviously, it's
266 * useful to inspect ZFS metadata, but if possible, we should avoid keeping
267 * excess / transient data in-core during a crashdump.
270 zio_buf_alloc(size_t size
)
272 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
274 ASSERT(c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
276 return (kmem_cache_alloc(zio_buf_cache
[c
], KM_PUSHPAGE
| KM_NODEBUG
));
280 * Use zio_data_buf_alloc to allocate data. The data will not appear in a
281 * crashdump if the kernel panics. This exists so that we will limit the amount
282 * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount
283 * of kernel heap dumped to disk when the kernel panics)
286 zio_data_buf_alloc(size_t size
)
288 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
290 ASSERT(c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
292 return (kmem_cache_alloc(zio_data_buf_cache
[c
],
293 KM_PUSHPAGE
| KM_NODEBUG
));
297 zio_buf_free(void *buf
, size_t size
)
299 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
301 ASSERT(c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
303 kmem_cache_free(zio_buf_cache
[c
], buf
);
307 zio_data_buf_free(void *buf
, size_t size
)
309 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
311 ASSERT(c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
313 kmem_cache_free(zio_data_buf_cache
[c
], buf
);
317 * Dedicated I/O buffers to ensure that memory fragmentation never prevents
318 * or significantly delays the issuing of a zio. These buffers are used
319 * to aggregate I/O and could be used for raidz stripes.
324 return (kmem_cache_alloc(zio_vdev_cache
, KM_PUSHPAGE
));
328 zio_vdev_free(void *buf
)
330 kmem_cache_free(zio_vdev_cache
, buf
);
335 * ==========================================================================
336 * Push and pop I/O transform buffers
337 * ==========================================================================
340 zio_push_transform(zio_t
*zio
, void *data
, uint64_t size
, uint64_t bufsize
,
341 zio_transform_func_t
*transform
)
343 zio_transform_t
*zt
= kmem_alloc(sizeof (zio_transform_t
), KM_PUSHPAGE
);
345 zt
->zt_orig_data
= zio
->io_data
;
346 zt
->zt_orig_size
= zio
->io_size
;
347 zt
->zt_bufsize
= bufsize
;
348 zt
->zt_transform
= transform
;
350 zt
->zt_next
= zio
->io_transform_stack
;
351 zio
->io_transform_stack
= zt
;
358 zio_pop_transforms(zio_t
*zio
)
362 while ((zt
= zio
->io_transform_stack
) != NULL
) {
363 if (zt
->zt_transform
!= NULL
)
364 zt
->zt_transform(zio
,
365 zt
->zt_orig_data
, zt
->zt_orig_size
);
367 if (zt
->zt_bufsize
!= 0)
368 zio_buf_free(zio
->io_data
, zt
->zt_bufsize
);
370 zio
->io_data
= zt
->zt_orig_data
;
371 zio
->io_size
= zt
->zt_orig_size
;
372 zio
->io_transform_stack
= zt
->zt_next
;
374 kmem_free(zt
, sizeof (zio_transform_t
));
379 * ==========================================================================
380 * I/O transform callbacks for subblocks and decompression
381 * ==========================================================================
384 zio_subblock(zio_t
*zio
, void *data
, uint64_t size
)
386 ASSERT(zio
->io_size
> size
);
388 if (zio
->io_type
== ZIO_TYPE_READ
)
389 bcopy(zio
->io_data
, data
, size
);
393 zio_decompress(zio_t
*zio
, void *data
, uint64_t size
)
395 if (zio
->io_error
== 0 &&
396 zio_decompress_data(BP_GET_COMPRESS(zio
->io_bp
),
397 zio
->io_data
, data
, zio
->io_size
, size
) != 0)
402 * ==========================================================================
403 * I/O parent/child relationships and pipeline interlocks
404 * ==========================================================================
407 * NOTE - Callers to zio_walk_parents() and zio_walk_children must
408 * continue calling these functions until they return NULL.
409 * Otherwise, the next caller will pick up the list walk in
410 * some indeterminate state. (Otherwise every caller would
411 * have to pass in a cookie to keep the state represented by
412 * io_walk_link, which gets annoying.)
415 zio_walk_parents(zio_t
*cio
)
417 zio_link_t
*zl
= cio
->io_walk_link
;
418 list_t
*pl
= &cio
->io_parent_list
;
420 zl
= (zl
== NULL
) ? list_head(pl
) : list_next(pl
, zl
);
421 cio
->io_walk_link
= zl
;
426 ASSERT(zl
->zl_child
== cio
);
427 return (zl
->zl_parent
);
431 zio_walk_children(zio_t
*pio
)
433 zio_link_t
*zl
= pio
->io_walk_link
;
434 list_t
*cl
= &pio
->io_child_list
;
436 zl
= (zl
== NULL
) ? list_head(cl
) : list_next(cl
, zl
);
437 pio
->io_walk_link
= zl
;
442 ASSERT(zl
->zl_parent
== pio
);
443 return (zl
->zl_child
);
447 zio_unique_parent(zio_t
*cio
)
449 zio_t
*pio
= zio_walk_parents(cio
);
451 VERIFY(zio_walk_parents(cio
) == NULL
);
456 zio_add_child(zio_t
*pio
, zio_t
*cio
)
458 zio_link_t
*zl
= kmem_cache_alloc(zio_link_cache
, KM_PUSHPAGE
);
462 * Logical I/Os can have logical, gang, or vdev children.
463 * Gang I/Os can have gang or vdev children.
464 * Vdev I/Os can only have vdev children.
465 * The following ASSERT captures all of these constraints.
467 ASSERT(cio
->io_child_type
<= pio
->io_child_type
);
472 mutex_enter(&cio
->io_lock
);
473 mutex_enter(&pio
->io_lock
);
475 ASSERT(pio
->io_state
[ZIO_WAIT_DONE
] == 0);
477 for (w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
478 pio
->io_children
[cio
->io_child_type
][w
] += !cio
->io_state
[w
];
480 list_insert_head(&pio
->io_child_list
, zl
);
481 list_insert_head(&cio
->io_parent_list
, zl
);
483 pio
->io_child_count
++;
484 cio
->io_parent_count
++;
486 mutex_exit(&pio
->io_lock
);
487 mutex_exit(&cio
->io_lock
);
491 zio_remove_child(zio_t
*pio
, zio_t
*cio
, zio_link_t
*zl
)
493 ASSERT(zl
->zl_parent
== pio
);
494 ASSERT(zl
->zl_child
== cio
);
496 mutex_enter(&cio
->io_lock
);
497 mutex_enter(&pio
->io_lock
);
499 list_remove(&pio
->io_child_list
, zl
);
500 list_remove(&cio
->io_parent_list
, zl
);
502 pio
->io_child_count
--;
503 cio
->io_parent_count
--;
505 mutex_exit(&pio
->io_lock
);
506 mutex_exit(&cio
->io_lock
);
508 kmem_cache_free(zio_link_cache
, zl
);
512 zio_wait_for_children(zio_t
*zio
, enum zio_child child
, enum zio_wait_type wait
)
514 uint64_t *countp
= &zio
->io_children
[child
][wait
];
515 boolean_t waiting
= B_FALSE
;
517 mutex_enter(&zio
->io_lock
);
518 ASSERT(zio
->io_stall
== NULL
);
521 zio
->io_stall
= countp
;
524 mutex_exit(&zio
->io_lock
);
529 __attribute__((always_inline
))
531 zio_notify_parent(zio_t
*pio
, zio_t
*zio
, enum zio_wait_type wait
)
533 uint64_t *countp
= &pio
->io_children
[zio
->io_child_type
][wait
];
534 int *errorp
= &pio
->io_child_error
[zio
->io_child_type
];
536 mutex_enter(&pio
->io_lock
);
537 if (zio
->io_error
&& !(zio
->io_flags
& ZIO_FLAG_DONT_PROPAGATE
))
538 *errorp
= zio_worst_error(*errorp
, zio
->io_error
);
539 pio
->io_reexecute
|= zio
->io_reexecute
;
540 ASSERT3U(*countp
, >, 0);
541 if (--*countp
== 0 && pio
->io_stall
== countp
) {
542 pio
->io_stall
= NULL
;
543 mutex_exit(&pio
->io_lock
);
546 mutex_exit(&pio
->io_lock
);
551 zio_inherit_child_errors(zio_t
*zio
, enum zio_child c
)
553 if (zio
->io_child_error
[c
] != 0 && zio
->io_error
== 0)
554 zio
->io_error
= zio
->io_child_error
[c
];
558 * ==========================================================================
559 * Create the various types of I/O (read, write, free, etc)
560 * ==========================================================================
563 zio_create(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
,
564 void *data
, uint64_t size
, zio_done_func_t
*done
, void *private,
565 zio_type_t type
, int priority
, enum zio_flag flags
,
566 vdev_t
*vd
, uint64_t offset
, const zbookmark_t
*zb
,
567 enum zio_stage stage
, enum zio_stage pipeline
)
571 ASSERT3U(size
, <=, SPA_MAXBLOCKSIZE
);
572 ASSERT(P2PHASE(size
, SPA_MINBLOCKSIZE
) == 0);
573 ASSERT(P2PHASE(offset
, SPA_MINBLOCKSIZE
) == 0);
575 ASSERT(!vd
|| spa_config_held(spa
, SCL_STATE_ALL
, RW_READER
));
576 ASSERT(!bp
|| !(flags
& ZIO_FLAG_CONFIG_WRITER
));
577 ASSERT(vd
|| stage
== ZIO_STAGE_OPEN
);
579 zio
= kmem_cache_alloc(zio_cache
, KM_PUSHPAGE
);
582 zio
->io_child_type
= ZIO_CHILD_VDEV
;
583 else if (flags
& ZIO_FLAG_GANG_CHILD
)
584 zio
->io_child_type
= ZIO_CHILD_GANG
;
585 else if (flags
& ZIO_FLAG_DDT_CHILD
)
586 zio
->io_child_type
= ZIO_CHILD_DDT
;
588 zio
->io_child_type
= ZIO_CHILD_LOGICAL
;
591 zio
->io_logical
= NULL
;
592 zio
->io_bp
= (blkptr_t
*)bp
;
593 zio
->io_bp_copy
= *bp
;
594 zio
->io_bp_orig
= *bp
;
595 if (type
!= ZIO_TYPE_WRITE
||
596 zio
->io_child_type
== ZIO_CHILD_DDT
)
597 zio
->io_bp
= &zio
->io_bp_copy
; /* so caller can free */
598 if (zio
->io_child_type
== ZIO_CHILD_LOGICAL
)
599 zio
->io_logical
= zio
;
600 if (zio
->io_child_type
> ZIO_CHILD_GANG
&& BP_IS_GANG(bp
))
601 pipeline
|= ZIO_GANG_STAGES
;
603 zio
->io_logical
= NULL
;
605 bzero(&zio
->io_bp_copy
, sizeof (blkptr_t
));
606 bzero(&zio
->io_bp_orig
, sizeof (blkptr_t
));
611 zio
->io_ready
= NULL
;
613 zio
->io_private
= private;
614 zio
->io_prev_space_delta
= 0;
616 zio
->io_priority
= priority
;
619 zio
->io_vsd_ops
= NULL
;
620 zio
->io_offset
= offset
;
621 zio
->io_deadline
= 0;
622 zio
->io_timestamp
= 0;
625 zio
->io_orig_data
= zio
->io_data
= data
;
626 zio
->io_orig_size
= zio
->io_size
= size
;
627 zio
->io_orig_flags
= zio
->io_flags
= flags
;
628 zio
->io_orig_stage
= zio
->io_stage
= stage
;
629 zio
->io_orig_pipeline
= zio
->io_pipeline
= pipeline
;
630 bzero(&zio
->io_prop
, sizeof (zio_prop_t
));
632 zio
->io_reexecute
= 0;
633 zio
->io_bp_override
= NULL
;
634 zio
->io_walk_link
= NULL
;
635 zio
->io_transform_stack
= NULL
;
637 zio
->io_child_count
= 0;
638 zio
->io_parent_count
= 0;
639 zio
->io_stall
= NULL
;
640 zio
->io_gang_leader
= NULL
;
641 zio
->io_gang_tree
= NULL
;
642 zio
->io_executor
= NULL
;
643 zio
->io_waiter
= NULL
;
644 zio
->io_cksum_report
= NULL
;
646 bzero(zio
->io_child_error
, sizeof (int) * ZIO_CHILD_TYPES
);
647 bzero(zio
->io_children
,
648 sizeof (uint64_t) * ZIO_CHILD_TYPES
* ZIO_WAIT_TYPES
);
649 bzero(&zio
->io_bookmark
, sizeof (zbookmark_t
));
651 zio
->io_state
[ZIO_WAIT_READY
] = (stage
>= ZIO_STAGE_READY
);
652 zio
->io_state
[ZIO_WAIT_DONE
] = (stage
>= ZIO_STAGE_DONE
);
655 zio
->io_bookmark
= *zb
;
658 if (zio
->io_logical
== NULL
)
659 zio
->io_logical
= pio
->io_logical
;
660 if (zio
->io_child_type
== ZIO_CHILD_GANG
)
661 zio
->io_gang_leader
= pio
->io_gang_leader
;
662 zio_add_child(pio
, zio
);
665 taskq_init_ent(&zio
->io_tqent
);
671 zio_destroy(zio_t
*zio
)
673 kmem_cache_free(zio_cache
, zio
);
677 zio_null(zio_t
*pio
, spa_t
*spa
, vdev_t
*vd
, zio_done_func_t
*done
,
678 void *private, enum zio_flag flags
)
682 zio
= zio_create(pio
, spa
, 0, NULL
, NULL
, 0, done
, private,
683 ZIO_TYPE_NULL
, ZIO_PRIORITY_NOW
, flags
, vd
, 0, NULL
,
684 ZIO_STAGE_OPEN
, ZIO_INTERLOCK_PIPELINE
);
690 zio_root(spa_t
*spa
, zio_done_func_t
*done
, void *private, enum zio_flag flags
)
692 return (zio_null(NULL
, spa
, NULL
, done
, private, flags
));
696 zio_read(zio_t
*pio
, spa_t
*spa
, const blkptr_t
*bp
,
697 void *data
, uint64_t size
, zio_done_func_t
*done
, void *private,
698 int priority
, enum zio_flag flags
, const zbookmark_t
*zb
)
702 zio
= zio_create(pio
, spa
, BP_PHYSICAL_BIRTH(bp
), bp
,
703 data
, size
, done
, private,
704 ZIO_TYPE_READ
, priority
, flags
, NULL
, 0, zb
,
705 ZIO_STAGE_OPEN
, (flags
& ZIO_FLAG_DDT_CHILD
) ?
706 ZIO_DDT_CHILD_READ_PIPELINE
: ZIO_READ_PIPELINE
);
712 zio_write(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, blkptr_t
*bp
,
713 void *data
, uint64_t size
, const zio_prop_t
*zp
,
714 zio_done_func_t
*ready
, zio_done_func_t
*done
, void *private,
715 int priority
, enum zio_flag flags
, const zbookmark_t
*zb
)
719 ASSERT(zp
->zp_checksum
>= ZIO_CHECKSUM_OFF
&&
720 zp
->zp_checksum
< ZIO_CHECKSUM_FUNCTIONS
&&
721 zp
->zp_compress
>= ZIO_COMPRESS_OFF
&&
722 zp
->zp_compress
< ZIO_COMPRESS_FUNCTIONS
&&
723 DMU_OT_IS_VALID(zp
->zp_type
) &&
726 zp
->zp_copies
<= spa_max_replication(spa
) &&
728 zp
->zp_dedup_verify
<= 1);
730 zio
= zio_create(pio
, spa
, txg
, bp
, data
, size
, done
, private,
731 ZIO_TYPE_WRITE
, priority
, flags
, NULL
, 0, zb
,
732 ZIO_STAGE_OPEN
, (flags
& ZIO_FLAG_DDT_CHILD
) ?
733 ZIO_DDT_CHILD_WRITE_PIPELINE
: ZIO_WRITE_PIPELINE
);
735 zio
->io_ready
= ready
;
742 zio_rewrite(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, blkptr_t
*bp
, void *data
,
743 uint64_t size
, zio_done_func_t
*done
, void *private, int priority
,
744 enum zio_flag flags
, zbookmark_t
*zb
)
748 zio
= zio_create(pio
, spa
, txg
, bp
, data
, size
, done
, private,
749 ZIO_TYPE_WRITE
, priority
, flags
, NULL
, 0, zb
,
750 ZIO_STAGE_OPEN
, ZIO_REWRITE_PIPELINE
);
756 zio_write_override(zio_t
*zio
, blkptr_t
*bp
, int copies
)
758 ASSERT(zio
->io_type
== ZIO_TYPE_WRITE
);
759 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
760 ASSERT(zio
->io_stage
== ZIO_STAGE_OPEN
);
761 ASSERT(zio
->io_txg
== spa_syncing_txg(zio
->io_spa
));
763 zio
->io_prop
.zp_copies
= copies
;
764 zio
->io_bp_override
= bp
;
768 zio_free(spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
)
770 bplist_append(&spa
->spa_free_bplist
[txg
& TXG_MASK
], bp
);
774 zio_free_sync(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
,
779 dprintf_bp(bp
, "freeing in txg %llu, pass %u",
780 (longlong_t
)txg
, spa
->spa_sync_pass
);
782 ASSERT(!BP_IS_HOLE(bp
));
783 ASSERT(spa_syncing_txg(spa
) == txg
);
784 ASSERT(spa_sync_pass(spa
) < zfs_sync_pass_deferred_free
);
788 zio
= zio_create(pio
, spa
, txg
, bp
, NULL
, BP_GET_PSIZE(bp
),
789 NULL
, NULL
, ZIO_TYPE_FREE
, ZIO_PRIORITY_FREE
, flags
,
790 NULL
, 0, NULL
, ZIO_STAGE_OPEN
, ZIO_FREE_PIPELINE
);
796 zio_claim(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
,
797 zio_done_func_t
*done
, void *private, enum zio_flag flags
)
802 * A claim is an allocation of a specific block. Claims are needed
803 * to support immediate writes in the intent log. The issue is that
804 * immediate writes contain committed data, but in a txg that was
805 * *not* committed. Upon opening the pool after an unclean shutdown,
806 * the intent log claims all blocks that contain immediate write data
807 * so that the SPA knows they're in use.
809 * All claims *must* be resolved in the first txg -- before the SPA
810 * starts allocating blocks -- so that nothing is allocated twice.
811 * If txg == 0 we just verify that the block is claimable.
813 ASSERT3U(spa
->spa_uberblock
.ub_rootbp
.blk_birth
, <, spa_first_txg(spa
));
814 ASSERT(txg
== spa_first_txg(spa
) || txg
== 0);
815 ASSERT(!BP_GET_DEDUP(bp
) || !spa_writeable(spa
)); /* zdb(1M) */
817 zio
= zio_create(pio
, spa
, txg
, bp
, NULL
, BP_GET_PSIZE(bp
),
818 done
, private, ZIO_TYPE_CLAIM
, ZIO_PRIORITY_NOW
, flags
,
819 NULL
, 0, NULL
, ZIO_STAGE_OPEN
, ZIO_CLAIM_PIPELINE
);
825 zio_ioctl(zio_t
*pio
, spa_t
*spa
, vdev_t
*vd
, int cmd
,
826 zio_done_func_t
*done
, void *private, int priority
, enum zio_flag flags
)
831 if (vd
->vdev_children
== 0) {
832 zio
= zio_create(pio
, spa
, 0, NULL
, NULL
, 0, done
, private,
833 ZIO_TYPE_IOCTL
, priority
, flags
, vd
, 0, NULL
,
834 ZIO_STAGE_OPEN
, ZIO_IOCTL_PIPELINE
);
838 zio
= zio_null(pio
, spa
, NULL
, NULL
, NULL
, flags
);
840 for (c
= 0; c
< vd
->vdev_children
; c
++)
841 zio_nowait(zio_ioctl(zio
, spa
, vd
->vdev_child
[c
], cmd
,
842 done
, private, priority
, flags
));
849 zio_read_phys(zio_t
*pio
, vdev_t
*vd
, uint64_t offset
, uint64_t size
,
850 void *data
, int checksum
, zio_done_func_t
*done
, void *private,
851 int priority
, enum zio_flag flags
, boolean_t labels
)
855 ASSERT(vd
->vdev_children
== 0);
856 ASSERT(!labels
|| offset
+ size
<= VDEV_LABEL_START_SIZE
||
857 offset
>= vd
->vdev_psize
- VDEV_LABEL_END_SIZE
);
858 ASSERT3U(offset
+ size
, <=, vd
->vdev_psize
);
860 zio
= zio_create(pio
, vd
->vdev_spa
, 0, NULL
, data
, size
, done
, private,
861 ZIO_TYPE_READ
, priority
, flags
, vd
, offset
, NULL
,
862 ZIO_STAGE_OPEN
, ZIO_READ_PHYS_PIPELINE
);
864 zio
->io_prop
.zp_checksum
= checksum
;
870 zio_write_phys(zio_t
*pio
, vdev_t
*vd
, uint64_t offset
, uint64_t size
,
871 void *data
, int checksum
, zio_done_func_t
*done
, void *private,
872 int priority
, enum zio_flag flags
, boolean_t labels
)
876 ASSERT(vd
->vdev_children
== 0);
877 ASSERT(!labels
|| offset
+ size
<= VDEV_LABEL_START_SIZE
||
878 offset
>= vd
->vdev_psize
- VDEV_LABEL_END_SIZE
);
879 ASSERT3U(offset
+ size
, <=, vd
->vdev_psize
);
881 zio
= zio_create(pio
, vd
->vdev_spa
, 0, NULL
, data
, size
, done
, private,
882 ZIO_TYPE_WRITE
, priority
, flags
, vd
, offset
, NULL
,
883 ZIO_STAGE_OPEN
, ZIO_WRITE_PHYS_PIPELINE
);
885 zio
->io_prop
.zp_checksum
= checksum
;
887 if (zio_checksum_table
[checksum
].ci_eck
) {
889 * zec checksums are necessarily destructive -- they modify
890 * the end of the write buffer to hold the verifier/checksum.
891 * Therefore, we must make a local copy in case the data is
892 * being written to multiple places in parallel.
894 void *wbuf
= zio_buf_alloc(size
);
895 bcopy(data
, wbuf
, size
);
896 zio_push_transform(zio
, wbuf
, size
, size
, NULL
);
903 * Create a child I/O to do some work for us.
906 zio_vdev_child_io(zio_t
*pio
, blkptr_t
*bp
, vdev_t
*vd
, uint64_t offset
,
907 void *data
, uint64_t size
, int type
, int priority
, enum zio_flag flags
,
908 zio_done_func_t
*done
, void *private)
910 enum zio_stage pipeline
= ZIO_VDEV_CHILD_PIPELINE
;
913 ASSERT(vd
->vdev_parent
==
914 (pio
->io_vd
? pio
->io_vd
: pio
->io_spa
->spa_root_vdev
));
916 if (type
== ZIO_TYPE_READ
&& bp
!= NULL
) {
918 * If we have the bp, then the child should perform the
919 * checksum and the parent need not. This pushes error
920 * detection as close to the leaves as possible and
921 * eliminates redundant checksums in the interior nodes.
923 pipeline
|= ZIO_STAGE_CHECKSUM_VERIFY
;
924 pio
->io_pipeline
&= ~ZIO_STAGE_CHECKSUM_VERIFY
;
927 if (vd
->vdev_children
== 0)
928 offset
+= VDEV_LABEL_START_SIZE
;
930 flags
|= ZIO_VDEV_CHILD_FLAGS(pio
) | ZIO_FLAG_DONT_PROPAGATE
;
933 * If we've decided to do a repair, the write is not speculative --
934 * even if the original read was.
936 if (flags
& ZIO_FLAG_IO_REPAIR
)
937 flags
&= ~ZIO_FLAG_SPECULATIVE
;
939 zio
= zio_create(pio
, pio
->io_spa
, pio
->io_txg
, bp
, data
, size
,
940 done
, private, type
, priority
, flags
, vd
, offset
, &pio
->io_bookmark
,
941 ZIO_STAGE_VDEV_IO_START
>> 1, pipeline
);
947 zio_vdev_delegated_io(vdev_t
*vd
, uint64_t offset
, void *data
, uint64_t size
,
948 int type
, int priority
, enum zio_flag flags
,
949 zio_done_func_t
*done
, void *private)
953 ASSERT(vd
->vdev_ops
->vdev_op_leaf
);
955 zio
= zio_create(NULL
, vd
->vdev_spa
, 0, NULL
,
956 data
, size
, done
, private, type
, priority
,
957 flags
| ZIO_FLAG_CANFAIL
| ZIO_FLAG_DONT_RETRY
,
959 ZIO_STAGE_VDEV_IO_START
>> 1, ZIO_VDEV_CHILD_PIPELINE
);
965 zio_flush(zio_t
*zio
, vdev_t
*vd
)
967 zio_nowait(zio_ioctl(zio
, zio
->io_spa
, vd
, DKIOCFLUSHWRITECACHE
,
968 NULL
, NULL
, ZIO_PRIORITY_NOW
,
969 ZIO_FLAG_CANFAIL
| ZIO_FLAG_DONT_PROPAGATE
| ZIO_FLAG_DONT_RETRY
));
973 zio_shrink(zio_t
*zio
, uint64_t size
)
975 ASSERT(zio
->io_executor
== NULL
);
976 ASSERT(zio
->io_orig_size
== zio
->io_size
);
977 ASSERT(size
<= zio
->io_size
);
980 * We don't shrink for raidz because of problems with the
981 * reconstruction when reading back less than the block size.
982 * Note, BP_IS_RAIDZ() assumes no compression.
984 ASSERT(BP_GET_COMPRESS(zio
->io_bp
) == ZIO_COMPRESS_OFF
);
985 if (!BP_IS_RAIDZ(zio
->io_bp
))
986 zio
->io_orig_size
= zio
->io_size
= size
;
990 * ==========================================================================
991 * Prepare to read and write logical blocks
992 * ==========================================================================
996 zio_read_bp_init(zio_t
*zio
)
998 blkptr_t
*bp
= zio
->io_bp
;
1000 if (BP_GET_COMPRESS(bp
) != ZIO_COMPRESS_OFF
&&
1001 zio
->io_child_type
== ZIO_CHILD_LOGICAL
&&
1002 !(zio
->io_flags
& ZIO_FLAG_RAW
)) {
1003 uint64_t psize
= BP_GET_PSIZE(bp
);
1004 void *cbuf
= zio_buf_alloc(psize
);
1006 zio_push_transform(zio
, cbuf
, psize
, psize
, zio_decompress
);
1009 if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp
)) && BP_GET_LEVEL(bp
) == 0)
1010 zio
->io_flags
|= ZIO_FLAG_DONT_CACHE
;
1012 if (BP_GET_TYPE(bp
) == DMU_OT_DDT_ZAP
)
1013 zio
->io_flags
|= ZIO_FLAG_DONT_CACHE
;
1015 if (BP_GET_DEDUP(bp
) && zio
->io_child_type
== ZIO_CHILD_LOGICAL
)
1016 zio
->io_pipeline
= ZIO_DDT_READ_PIPELINE
;
1018 return (ZIO_PIPELINE_CONTINUE
);
1022 zio_write_bp_init(zio_t
*zio
)
1024 spa_t
*spa
= zio
->io_spa
;
1025 zio_prop_t
*zp
= &zio
->io_prop
;
1026 enum zio_compress compress
= zp
->zp_compress
;
1027 blkptr_t
*bp
= zio
->io_bp
;
1028 uint64_t lsize
= zio
->io_size
;
1029 uint64_t psize
= lsize
;
1033 * If our children haven't all reached the ready stage,
1034 * wait for them and then repeat this pipeline stage.
1036 if (zio_wait_for_children(zio
, ZIO_CHILD_GANG
, ZIO_WAIT_READY
) ||
1037 zio_wait_for_children(zio
, ZIO_CHILD_LOGICAL
, ZIO_WAIT_READY
))
1038 return (ZIO_PIPELINE_STOP
);
1040 if (!IO_IS_ALLOCATING(zio
))
1041 return (ZIO_PIPELINE_CONTINUE
);
1043 ASSERT(zio
->io_child_type
!= ZIO_CHILD_DDT
);
1045 if (zio
->io_bp_override
) {
1046 ASSERT(bp
->blk_birth
!= zio
->io_txg
);
1047 ASSERT(BP_GET_DEDUP(zio
->io_bp_override
) == 0);
1049 *bp
= *zio
->io_bp_override
;
1050 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1052 if (BP_IS_HOLE(bp
) || !zp
->zp_dedup
)
1053 return (ZIO_PIPELINE_CONTINUE
);
1055 ASSERT(zio_checksum_table
[zp
->zp_checksum
].ci_dedup
||
1056 zp
->zp_dedup_verify
);
1058 if (BP_GET_CHECKSUM(bp
) == zp
->zp_checksum
) {
1059 BP_SET_DEDUP(bp
, 1);
1060 zio
->io_pipeline
|= ZIO_STAGE_DDT_WRITE
;
1061 return (ZIO_PIPELINE_CONTINUE
);
1063 zio
->io_bp_override
= NULL
;
1067 if (bp
->blk_birth
== zio
->io_txg
) {
1069 * We're rewriting an existing block, which means we're
1070 * working on behalf of spa_sync(). For spa_sync() to
1071 * converge, it must eventually be the case that we don't
1072 * have to allocate new blocks. But compression changes
1073 * the blocksize, which forces a reallocate, and makes
1074 * convergence take longer. Therefore, after the first
1075 * few passes, stop compressing to ensure convergence.
1077 pass
= spa_sync_pass(spa
);
1079 ASSERT(zio
->io_txg
== spa_syncing_txg(spa
));
1080 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1081 ASSERT(!BP_GET_DEDUP(bp
));
1083 if (pass
>= zfs_sync_pass_dont_compress
)
1084 compress
= ZIO_COMPRESS_OFF
;
1086 /* Make sure someone doesn't change their mind on overwrites */
1087 ASSERT(MIN(zp
->zp_copies
+ BP_IS_GANG(bp
),
1088 spa_max_replication(spa
)) == BP_GET_NDVAS(bp
));
1091 if (compress
!= ZIO_COMPRESS_OFF
) {
1092 void *cbuf
= zio_buf_alloc(lsize
);
1093 psize
= zio_compress_data(compress
, zio
->io_data
, cbuf
, lsize
);
1094 if (psize
== 0 || psize
== lsize
) {
1095 compress
= ZIO_COMPRESS_OFF
;
1096 zio_buf_free(cbuf
, lsize
);
1098 ASSERT(psize
< lsize
);
1099 zio_push_transform(zio
, cbuf
, psize
, lsize
, NULL
);
1104 * The final pass of spa_sync() must be all rewrites, but the first
1105 * few passes offer a trade-off: allocating blocks defers convergence,
1106 * but newly allocated blocks are sequential, so they can be written
1107 * to disk faster. Therefore, we allow the first few passes of
1108 * spa_sync() to allocate new blocks, but force rewrites after that.
1109 * There should only be a handful of blocks after pass 1 in any case.
1111 if (bp
->blk_birth
== zio
->io_txg
&& BP_GET_PSIZE(bp
) == psize
&&
1112 pass
>= zfs_sync_pass_rewrite
) {
1113 enum zio_stage gang_stages
= zio
->io_pipeline
& ZIO_GANG_STAGES
;
1115 zio
->io_pipeline
= ZIO_REWRITE_PIPELINE
| gang_stages
;
1116 zio
->io_flags
|= ZIO_FLAG_IO_REWRITE
;
1119 zio
->io_pipeline
= ZIO_WRITE_PIPELINE
;
1123 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1125 ASSERT(zp
->zp_checksum
!= ZIO_CHECKSUM_GANG_HEADER
);
1126 BP_SET_LSIZE(bp
, lsize
);
1127 BP_SET_PSIZE(bp
, psize
);
1128 BP_SET_COMPRESS(bp
, compress
);
1129 BP_SET_CHECKSUM(bp
, zp
->zp_checksum
);
1130 BP_SET_TYPE(bp
, zp
->zp_type
);
1131 BP_SET_LEVEL(bp
, zp
->zp_level
);
1132 BP_SET_DEDUP(bp
, zp
->zp_dedup
);
1133 BP_SET_BYTEORDER(bp
, ZFS_HOST_BYTEORDER
);
1135 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1136 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_REWRITE
));
1137 zio
->io_pipeline
= ZIO_DDT_WRITE_PIPELINE
;
1141 return (ZIO_PIPELINE_CONTINUE
);
1145 zio_free_bp_init(zio_t
*zio
)
1147 blkptr_t
*bp
= zio
->io_bp
;
1149 if (zio
->io_child_type
== ZIO_CHILD_LOGICAL
) {
1150 if (BP_GET_DEDUP(bp
))
1151 zio
->io_pipeline
= ZIO_DDT_FREE_PIPELINE
;
1154 return (ZIO_PIPELINE_CONTINUE
);
1158 * ==========================================================================
1159 * Execute the I/O pipeline
1160 * ==========================================================================
1164 zio_taskq_dispatch(zio_t
*zio
, zio_taskq_type_t q
, boolean_t cutinline
)
1166 spa_t
*spa
= zio
->io_spa
;
1167 zio_type_t t
= zio
->io_type
;
1168 int flags
= (cutinline
? TQ_FRONT
: 0);
1171 * If we're a config writer or a probe, the normal issue and
1172 * interrupt threads may all be blocked waiting for the config lock.
1173 * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL.
1175 if (zio
->io_flags
& (ZIO_FLAG_CONFIG_WRITER
| ZIO_FLAG_PROBE
))
1179 * A similar issue exists for the L2ARC write thread until L2ARC 2.0.
1181 if (t
== ZIO_TYPE_WRITE
&& zio
->io_vd
&& zio
->io_vd
->vdev_aux
)
1185 * If this is a high priority I/O, then use the high priority taskq if
1188 if (zio
->io_priority
== ZIO_PRIORITY_NOW
&&
1189 spa
->spa_zio_taskq
[t
][q
+ 1].stqs_count
!= 0)
1192 ASSERT3U(q
, <, ZIO_TASKQ_TYPES
);
1195 * NB: We are assuming that the zio can only be dispatched
1196 * to a single taskq at a time. It would be a grievous error
1197 * to dispatch the zio to another taskq at the same time.
1199 ASSERT(taskq_empty_ent(&zio
->io_tqent
));
1200 spa_taskq_dispatch_ent(spa
, t
, q
, (task_func_t
*)zio_execute
, zio
,
1201 flags
, &zio
->io_tqent
);
1205 zio_taskq_member(zio_t
*zio
, zio_taskq_type_t q
)
1207 kthread_t
*executor
= zio
->io_executor
;
1208 spa_t
*spa
= zio
->io_spa
;
1211 for (t
= 0; t
< ZIO_TYPES
; t
++) {
1212 spa_taskqs_t
*tqs
= &spa
->spa_zio_taskq
[t
][q
];
1214 for (i
= 0; i
< tqs
->stqs_count
; i
++) {
1215 if (taskq_member(tqs
->stqs_taskq
[i
], executor
))
1224 zio_issue_async(zio_t
*zio
)
1226 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, B_FALSE
);
1228 return (ZIO_PIPELINE_STOP
);
1232 zio_interrupt(zio_t
*zio
)
1234 zio_taskq_dispatch(zio
, ZIO_TASKQ_INTERRUPT
, B_FALSE
);
1238 * Execute the I/O pipeline until one of the following occurs:
1239 * (1) the I/O completes; (2) the pipeline stalls waiting for
1240 * dependent child I/Os; (3) the I/O issues, so we're waiting
1241 * for an I/O completion interrupt; (4) the I/O is delegated by
1242 * vdev-level caching or aggregation; (5) the I/O is deferred
1243 * due to vdev-level queueing; (6) the I/O is handed off to
1244 * another thread. In all cases, the pipeline stops whenever
1245 * there's no CPU work; it never burns a thread in cv_wait_io().
1247 * There's no locking on io_stage because there's no legitimate way
1248 * for multiple threads to be attempting to process the same I/O.
1250 static zio_pipe_stage_t
*zio_pipeline
[];
1253 * zio_execute() is a wrapper around the static function
1254 * __zio_execute() so that we can force __zio_execute() to be
1255 * inlined. This reduces stack overhead which is important
1256 * because __zio_execute() is called recursively in several zio
1257 * code paths. zio_execute() itself cannot be inlined because
1258 * it is externally visible.
1261 zio_execute(zio_t
*zio
)
1266 __attribute__((always_inline
))
1268 __zio_execute(zio_t
*zio
)
1270 zio
->io_executor
= curthread
;
1272 while (zio
->io_stage
< ZIO_STAGE_DONE
) {
1273 enum zio_stage pipeline
= zio
->io_pipeline
;
1274 enum zio_stage stage
= zio
->io_stage
;
1279 ASSERT(!MUTEX_HELD(&zio
->io_lock
));
1280 ASSERT(ISP2(stage
));
1281 ASSERT(zio
->io_stall
== NULL
);
1285 } while ((stage
& pipeline
) == 0);
1287 ASSERT(stage
<= ZIO_STAGE_DONE
);
1289 dp
= spa_get_dsl(zio
->io_spa
);
1290 cut
= (stage
== ZIO_STAGE_VDEV_IO_START
) ?
1291 zio_requeue_io_start_cut_in_line
: B_FALSE
;
1294 * If we are in interrupt context and this pipeline stage
1295 * will grab a config lock that is held across I/O,
1296 * or may wait for an I/O that needs an interrupt thread
1297 * to complete, issue async to avoid deadlock.
1299 * For VDEV_IO_START, we cut in line so that the io will
1300 * be sent to disk promptly.
1302 if ((stage
& ZIO_BLOCKING_STAGES
) && zio
->io_vd
== NULL
&&
1303 zio_taskq_member(zio
, ZIO_TASKQ_INTERRUPT
)) {
1304 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, cut
);
1310 * If we executing in the context of the tx_sync_thread,
1311 * or we are performing pool initialization outside of a
1312 * zio_taskq[ZIO_TASKQ_ISSUE|ZIO_TASKQ_ISSUE_HIGH] context.
1313 * Then issue the zio asynchronously to minimize stack usage
1314 * for these deep call paths.
1316 if ((dp
&& curthread
== dp
->dp_tx
.tx_sync_thread
) ||
1317 (dp
&& spa_is_initializing(dp
->dp_spa
) &&
1318 !zio_taskq_member(zio
, ZIO_TASKQ_ISSUE
) &&
1319 !zio_taskq_member(zio
, ZIO_TASKQ_ISSUE_HIGH
))) {
1320 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, cut
);
1325 zio
->io_stage
= stage
;
1326 rv
= zio_pipeline
[highbit(stage
) - 1](zio
);
1328 if (rv
== ZIO_PIPELINE_STOP
)
1331 ASSERT(rv
== ZIO_PIPELINE_CONTINUE
);
1337 * ==========================================================================
1338 * Initiate I/O, either sync or async
1339 * ==========================================================================
1342 zio_wait(zio_t
*zio
)
1346 ASSERT(zio
->io_stage
== ZIO_STAGE_OPEN
);
1347 ASSERT(zio
->io_executor
== NULL
);
1349 zio
->io_waiter
= curthread
;
1353 mutex_enter(&zio
->io_lock
);
1354 while (zio
->io_executor
!= NULL
)
1355 cv_wait_io(&zio
->io_cv
, &zio
->io_lock
);
1356 mutex_exit(&zio
->io_lock
);
1358 error
= zio
->io_error
;
1365 zio_nowait(zio_t
*zio
)
1367 ASSERT(zio
->io_executor
== NULL
);
1369 if (zio
->io_child_type
== ZIO_CHILD_LOGICAL
&&
1370 zio_unique_parent(zio
) == NULL
) {
1372 * This is a logical async I/O with no parent to wait for it.
1373 * We add it to the spa_async_root_zio "Godfather" I/O which
1374 * will ensure they complete prior to unloading the pool.
1376 spa_t
*spa
= zio
->io_spa
;
1378 zio_add_child(spa
->spa_async_zio_root
, zio
);
1385 * ==========================================================================
1386 * Reexecute or suspend/resume failed I/O
1387 * ==========================================================================
1391 zio_reexecute(zio_t
*pio
)
1393 zio_t
*cio
, *cio_next
;
1396 ASSERT(pio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1397 ASSERT(pio
->io_orig_stage
== ZIO_STAGE_OPEN
);
1398 ASSERT(pio
->io_gang_leader
== NULL
);
1399 ASSERT(pio
->io_gang_tree
== NULL
);
1401 pio
->io_flags
= pio
->io_orig_flags
;
1402 pio
->io_stage
= pio
->io_orig_stage
;
1403 pio
->io_pipeline
= pio
->io_orig_pipeline
;
1404 pio
->io_reexecute
= 0;
1406 for (w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
1407 pio
->io_state
[w
] = 0;
1408 for (c
= 0; c
< ZIO_CHILD_TYPES
; c
++)
1409 pio
->io_child_error
[c
] = 0;
1411 if (IO_IS_ALLOCATING(pio
))
1412 BP_ZERO(pio
->io_bp
);
1415 * As we reexecute pio's children, new children could be created.
1416 * New children go to the head of pio's io_child_list, however,
1417 * so we will (correctly) not reexecute them. The key is that
1418 * the remainder of pio's io_child_list, from 'cio_next' onward,
1419 * cannot be affected by any side effects of reexecuting 'cio'.
1421 for (cio
= zio_walk_children(pio
); cio
!= NULL
; cio
= cio_next
) {
1422 cio_next
= zio_walk_children(pio
);
1423 mutex_enter(&pio
->io_lock
);
1424 for (w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
1425 pio
->io_children
[cio
->io_child_type
][w
]++;
1426 mutex_exit(&pio
->io_lock
);
1431 * Now that all children have been reexecuted, execute the parent.
1432 * We don't reexecute "The Godfather" I/O here as it's the
1433 * responsibility of the caller to wait on him.
1435 if (!(pio
->io_flags
& ZIO_FLAG_GODFATHER
))
1440 zio_suspend(spa_t
*spa
, zio_t
*zio
)
1442 if (spa_get_failmode(spa
) == ZIO_FAILURE_MODE_PANIC
)
1443 fm_panic("Pool '%s' has encountered an uncorrectable I/O "
1444 "failure and the failure mode property for this pool "
1445 "is set to panic.", spa_name(spa
));
1447 cmn_err(CE_WARN
, "Pool '%s' has encountered an uncorrectable I/O "
1448 "failure and has been suspended.\n", spa_name(spa
));
1450 zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE
, spa
, NULL
, NULL
, 0, 0);
1452 mutex_enter(&spa
->spa_suspend_lock
);
1454 if (spa
->spa_suspend_zio_root
== NULL
)
1455 spa
->spa_suspend_zio_root
= zio_root(spa
, NULL
, NULL
,
1456 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
|
1457 ZIO_FLAG_GODFATHER
);
1459 spa
->spa_suspended
= B_TRUE
;
1462 ASSERT(!(zio
->io_flags
& ZIO_FLAG_GODFATHER
));
1463 ASSERT(zio
!= spa
->spa_suspend_zio_root
);
1464 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1465 ASSERT(zio_unique_parent(zio
) == NULL
);
1466 ASSERT(zio
->io_stage
== ZIO_STAGE_DONE
);
1467 zio_add_child(spa
->spa_suspend_zio_root
, zio
);
1470 mutex_exit(&spa
->spa_suspend_lock
);
1474 zio_resume(spa_t
*spa
)
1479 * Reexecute all previously suspended i/o.
1481 mutex_enter(&spa
->spa_suspend_lock
);
1482 spa
->spa_suspended
= B_FALSE
;
1483 cv_broadcast(&spa
->spa_suspend_cv
);
1484 pio
= spa
->spa_suspend_zio_root
;
1485 spa
->spa_suspend_zio_root
= NULL
;
1486 mutex_exit(&spa
->spa_suspend_lock
);
1492 return (zio_wait(pio
));
1496 zio_resume_wait(spa_t
*spa
)
1498 mutex_enter(&spa
->spa_suspend_lock
);
1499 while (spa_suspended(spa
))
1500 cv_wait(&spa
->spa_suspend_cv
, &spa
->spa_suspend_lock
);
1501 mutex_exit(&spa
->spa_suspend_lock
);
1505 * ==========================================================================
1508 * A gang block is a collection of small blocks that looks to the DMU
1509 * like one large block. When zio_dva_allocate() cannot find a block
1510 * of the requested size, due to either severe fragmentation or the pool
1511 * being nearly full, it calls zio_write_gang_block() to construct the
1512 * block from smaller fragments.
1514 * A gang block consists of a gang header (zio_gbh_phys_t) and up to
1515 * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like
1516 * an indirect block: it's an array of block pointers. It consumes
1517 * only one sector and hence is allocatable regardless of fragmentation.
1518 * The gang header's bps point to its gang members, which hold the data.
1520 * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg>
1521 * as the verifier to ensure uniqueness of the SHA256 checksum.
1522 * Critically, the gang block bp's blk_cksum is the checksum of the data,
1523 * not the gang header. This ensures that data block signatures (needed for
1524 * deduplication) are independent of how the block is physically stored.
1526 * Gang blocks can be nested: a gang member may itself be a gang block.
1527 * Thus every gang block is a tree in which root and all interior nodes are
1528 * gang headers, and the leaves are normal blocks that contain user data.
1529 * The root of the gang tree is called the gang leader.
1531 * To perform any operation (read, rewrite, free, claim) on a gang block,
1532 * zio_gang_assemble() first assembles the gang tree (minus data leaves)
1533 * in the io_gang_tree field of the original logical i/o by recursively
1534 * reading the gang leader and all gang headers below it. This yields
1535 * an in-core tree containing the contents of every gang header and the
1536 * bps for every constituent of the gang block.
1538 * With the gang tree now assembled, zio_gang_issue() just walks the gang tree
1539 * and invokes a callback on each bp. To free a gang block, zio_gang_issue()
1540 * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp.
1541 * zio_claim_gang() provides a similarly trivial wrapper for zio_claim().
1542 * zio_read_gang() is a wrapper around zio_read() that omits reading gang
1543 * headers, since we already have those in io_gang_tree. zio_rewrite_gang()
1544 * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite()
1545 * of the gang header plus zio_checksum_compute() of the data to update the
1546 * gang header's blk_cksum as described above.
1548 * The two-phase assemble/issue model solves the problem of partial failure --
1549 * what if you'd freed part of a gang block but then couldn't read the
1550 * gang header for another part? Assembling the entire gang tree first
1551 * ensures that all the necessary gang header I/O has succeeded before
1552 * starting the actual work of free, claim, or write. Once the gang tree
1553 * is assembled, free and claim are in-memory operations that cannot fail.
1555 * In the event that a gang write fails, zio_dva_unallocate() walks the
1556 * gang tree to immediately free (i.e. insert back into the space map)
1557 * everything we've allocated. This ensures that we don't get ENOSPC
1558 * errors during repeated suspend/resume cycles due to a flaky device.
1560 * Gang rewrites only happen during sync-to-convergence. If we can't assemble
1561 * the gang tree, we won't modify the block, so we can safely defer the free
1562 * (knowing that the block is still intact). If we *can* assemble the gang
1563 * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free
1564 * each constituent bp and we can allocate a new block on the next sync pass.
1566 * In all cases, the gang tree allows complete recovery from partial failure.
1567 * ==========================================================================
1571 zio_read_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, void *data
)
1576 return (zio_read(pio
, pio
->io_spa
, bp
, data
, BP_GET_PSIZE(bp
),
1577 NULL
, NULL
, pio
->io_priority
, ZIO_GANG_CHILD_FLAGS(pio
),
1578 &pio
->io_bookmark
));
1582 zio_rewrite_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, void *data
)
1587 zio
= zio_rewrite(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
1588 gn
->gn_gbh
, SPA_GANGBLOCKSIZE
, NULL
, NULL
, pio
->io_priority
,
1589 ZIO_GANG_CHILD_FLAGS(pio
), &pio
->io_bookmark
);
1591 * As we rewrite each gang header, the pipeline will compute
1592 * a new gang block header checksum for it; but no one will
1593 * compute a new data checksum, so we do that here. The one
1594 * exception is the gang leader: the pipeline already computed
1595 * its data checksum because that stage precedes gang assembly.
1596 * (Presently, nothing actually uses interior data checksums;
1597 * this is just good hygiene.)
1599 if (gn
!= pio
->io_gang_leader
->io_gang_tree
) {
1600 zio_checksum_compute(zio
, BP_GET_CHECKSUM(bp
),
1601 data
, BP_GET_PSIZE(bp
));
1604 * If we are here to damage data for testing purposes,
1605 * leave the GBH alone so that we can detect the damage.
1607 if (pio
->io_gang_leader
->io_flags
& ZIO_FLAG_INDUCE_DAMAGE
)
1608 zio
->io_pipeline
&= ~ZIO_VDEV_IO_STAGES
;
1610 zio
= zio_rewrite(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
1611 data
, BP_GET_PSIZE(bp
), NULL
, NULL
, pio
->io_priority
,
1612 ZIO_GANG_CHILD_FLAGS(pio
), &pio
->io_bookmark
);
1620 zio_free_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, void *data
)
1622 return (zio_free_sync(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
1623 ZIO_GANG_CHILD_FLAGS(pio
)));
1628 zio_claim_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, void *data
)
1630 return (zio_claim(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
1631 NULL
, NULL
, ZIO_GANG_CHILD_FLAGS(pio
)));
1634 static zio_gang_issue_func_t
*zio_gang_issue_func
[ZIO_TYPES
] = {
1643 static void zio_gang_tree_assemble_done(zio_t
*zio
);
1645 static zio_gang_node_t
*
1646 zio_gang_node_alloc(zio_gang_node_t
**gnpp
)
1648 zio_gang_node_t
*gn
;
1650 ASSERT(*gnpp
== NULL
);
1652 gn
= kmem_zalloc(sizeof (*gn
), KM_PUSHPAGE
);
1653 gn
->gn_gbh
= zio_buf_alloc(SPA_GANGBLOCKSIZE
);
1660 zio_gang_node_free(zio_gang_node_t
**gnpp
)
1662 zio_gang_node_t
*gn
= *gnpp
;
1665 for (g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++)
1666 ASSERT(gn
->gn_child
[g
] == NULL
);
1668 zio_buf_free(gn
->gn_gbh
, SPA_GANGBLOCKSIZE
);
1669 kmem_free(gn
, sizeof (*gn
));
1674 zio_gang_tree_free(zio_gang_node_t
**gnpp
)
1676 zio_gang_node_t
*gn
= *gnpp
;
1682 for (g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++)
1683 zio_gang_tree_free(&gn
->gn_child
[g
]);
1685 zio_gang_node_free(gnpp
);
1689 zio_gang_tree_assemble(zio_t
*gio
, blkptr_t
*bp
, zio_gang_node_t
**gnpp
)
1691 zio_gang_node_t
*gn
= zio_gang_node_alloc(gnpp
);
1693 ASSERT(gio
->io_gang_leader
== gio
);
1694 ASSERT(BP_IS_GANG(bp
));
1696 zio_nowait(zio_read(gio
, gio
->io_spa
, bp
, gn
->gn_gbh
,
1697 SPA_GANGBLOCKSIZE
, zio_gang_tree_assemble_done
, gn
,
1698 gio
->io_priority
, ZIO_GANG_CHILD_FLAGS(gio
), &gio
->io_bookmark
));
1702 zio_gang_tree_assemble_done(zio_t
*zio
)
1704 zio_t
*gio
= zio
->io_gang_leader
;
1705 zio_gang_node_t
*gn
= zio
->io_private
;
1706 blkptr_t
*bp
= zio
->io_bp
;
1709 ASSERT(gio
== zio_unique_parent(zio
));
1710 ASSERT(zio
->io_child_count
== 0);
1715 if (BP_SHOULD_BYTESWAP(bp
))
1716 byteswap_uint64_array(zio
->io_data
, zio
->io_size
);
1718 ASSERT(zio
->io_data
== gn
->gn_gbh
);
1719 ASSERT(zio
->io_size
== SPA_GANGBLOCKSIZE
);
1720 ASSERT(gn
->gn_gbh
->zg_tail
.zec_magic
== ZEC_MAGIC
);
1722 for (g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++) {
1723 blkptr_t
*gbp
= &gn
->gn_gbh
->zg_blkptr
[g
];
1724 if (!BP_IS_GANG(gbp
))
1726 zio_gang_tree_assemble(gio
, gbp
, &gn
->gn_child
[g
]);
1731 zio_gang_tree_issue(zio_t
*pio
, zio_gang_node_t
*gn
, blkptr_t
*bp
, void *data
)
1733 zio_t
*gio
= pio
->io_gang_leader
;
1737 ASSERT(BP_IS_GANG(bp
) == !!gn
);
1738 ASSERT(BP_GET_CHECKSUM(bp
) == BP_GET_CHECKSUM(gio
->io_bp
));
1739 ASSERT(BP_GET_LSIZE(bp
) == BP_GET_PSIZE(bp
) || gn
== gio
->io_gang_tree
);
1742 * If you're a gang header, your data is in gn->gn_gbh.
1743 * If you're a gang member, your data is in 'data' and gn == NULL.
1745 zio
= zio_gang_issue_func
[gio
->io_type
](pio
, bp
, gn
, data
);
1748 ASSERT(gn
->gn_gbh
->zg_tail
.zec_magic
== ZEC_MAGIC
);
1750 for (g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++) {
1751 blkptr_t
*gbp
= &gn
->gn_gbh
->zg_blkptr
[g
];
1752 if (BP_IS_HOLE(gbp
))
1754 zio_gang_tree_issue(zio
, gn
->gn_child
[g
], gbp
, data
);
1755 data
= (char *)data
+ BP_GET_PSIZE(gbp
);
1759 if (gn
== gio
->io_gang_tree
)
1760 ASSERT3P((char *)gio
->io_data
+ gio
->io_size
, ==, data
);
1767 zio_gang_assemble(zio_t
*zio
)
1769 blkptr_t
*bp
= zio
->io_bp
;
1771 ASSERT(BP_IS_GANG(bp
) && zio
->io_gang_leader
== NULL
);
1772 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
1774 zio
->io_gang_leader
= zio
;
1776 zio_gang_tree_assemble(zio
, bp
, &zio
->io_gang_tree
);
1778 return (ZIO_PIPELINE_CONTINUE
);
1782 zio_gang_issue(zio_t
*zio
)
1784 blkptr_t
*bp
= zio
->io_bp
;
1786 if (zio_wait_for_children(zio
, ZIO_CHILD_GANG
, ZIO_WAIT_DONE
))
1787 return (ZIO_PIPELINE_STOP
);
1789 ASSERT(BP_IS_GANG(bp
) && zio
->io_gang_leader
== zio
);
1790 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
1792 if (zio
->io_child_error
[ZIO_CHILD_GANG
] == 0)
1793 zio_gang_tree_issue(zio
, zio
->io_gang_tree
, bp
, zio
->io_data
);
1795 zio_gang_tree_free(&zio
->io_gang_tree
);
1797 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1799 return (ZIO_PIPELINE_CONTINUE
);
1803 zio_write_gang_member_ready(zio_t
*zio
)
1805 zio_t
*pio
= zio_unique_parent(zio
);
1806 ASSERTV(zio_t
*gio
= zio
->io_gang_leader
;)
1807 dva_t
*cdva
= zio
->io_bp
->blk_dva
;
1808 dva_t
*pdva
= pio
->io_bp
->blk_dva
;
1812 if (BP_IS_HOLE(zio
->io_bp
))
1815 ASSERT(BP_IS_HOLE(&zio
->io_bp_orig
));
1817 ASSERT(zio
->io_child_type
== ZIO_CHILD_GANG
);
1818 ASSERT3U(zio
->io_prop
.zp_copies
, ==, gio
->io_prop
.zp_copies
);
1819 ASSERT3U(zio
->io_prop
.zp_copies
, <=, BP_GET_NDVAS(zio
->io_bp
));
1820 ASSERT3U(pio
->io_prop
.zp_copies
, <=, BP_GET_NDVAS(pio
->io_bp
));
1821 ASSERT3U(BP_GET_NDVAS(zio
->io_bp
), <=, BP_GET_NDVAS(pio
->io_bp
));
1823 mutex_enter(&pio
->io_lock
);
1824 for (d
= 0; d
< BP_GET_NDVAS(zio
->io_bp
); d
++) {
1825 ASSERT(DVA_GET_GANG(&pdva
[d
]));
1826 asize
= DVA_GET_ASIZE(&pdva
[d
]);
1827 asize
+= DVA_GET_ASIZE(&cdva
[d
]);
1828 DVA_SET_ASIZE(&pdva
[d
], asize
);
1830 mutex_exit(&pio
->io_lock
);
1834 zio_write_gang_block(zio_t
*pio
)
1836 spa_t
*spa
= pio
->io_spa
;
1837 blkptr_t
*bp
= pio
->io_bp
;
1838 zio_t
*gio
= pio
->io_gang_leader
;
1840 zio_gang_node_t
*gn
, **gnpp
;
1841 zio_gbh_phys_t
*gbh
;
1842 uint64_t txg
= pio
->io_txg
;
1843 uint64_t resid
= pio
->io_size
;
1845 int copies
= gio
->io_prop
.zp_copies
;
1846 int gbh_copies
= MIN(copies
+ 1, spa_max_replication(spa
));
1850 error
= metaslab_alloc(spa
, spa_normal_class(spa
), SPA_GANGBLOCKSIZE
,
1851 bp
, gbh_copies
, txg
, pio
== gio
? NULL
: gio
->io_bp
,
1852 METASLAB_HINTBP_FAVOR
| METASLAB_GANG_HEADER
);
1854 pio
->io_error
= error
;
1855 return (ZIO_PIPELINE_CONTINUE
);
1859 gnpp
= &gio
->io_gang_tree
;
1861 gnpp
= pio
->io_private
;
1862 ASSERT(pio
->io_ready
== zio_write_gang_member_ready
);
1865 gn
= zio_gang_node_alloc(gnpp
);
1867 bzero(gbh
, SPA_GANGBLOCKSIZE
);
1870 * Create the gang header.
1872 zio
= zio_rewrite(pio
, spa
, txg
, bp
, gbh
, SPA_GANGBLOCKSIZE
, NULL
, NULL
,
1873 pio
->io_priority
, ZIO_GANG_CHILD_FLAGS(pio
), &pio
->io_bookmark
);
1876 * Create and nowait the gang children.
1878 for (g
= 0; resid
!= 0; resid
-= lsize
, g
++) {
1879 lsize
= P2ROUNDUP(resid
/ (SPA_GBH_NBLKPTRS
- g
),
1881 ASSERT(lsize
>= SPA_MINBLOCKSIZE
&& lsize
<= resid
);
1883 zp
.zp_checksum
= gio
->io_prop
.zp_checksum
;
1884 zp
.zp_compress
= ZIO_COMPRESS_OFF
;
1885 zp
.zp_type
= DMU_OT_NONE
;
1887 zp
.zp_copies
= gio
->io_prop
.zp_copies
;
1889 zp
.zp_dedup_verify
= 0;
1891 zio_nowait(zio_write(zio
, spa
, txg
, &gbh
->zg_blkptr
[g
],
1892 (char *)pio
->io_data
+ (pio
->io_size
- resid
), lsize
, &zp
,
1893 zio_write_gang_member_ready
, NULL
, &gn
->gn_child
[g
],
1894 pio
->io_priority
, ZIO_GANG_CHILD_FLAGS(pio
),
1895 &pio
->io_bookmark
));
1899 * Set pio's pipeline to just wait for zio to finish.
1901 pio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1904 * We didn't allocate this bp, so make sure it doesn't get unmarked.
1906 pio
->io_flags
&= ~ZIO_FLAG_FASTWRITE
;
1910 return (ZIO_PIPELINE_CONTINUE
);
1914 * ==========================================================================
1916 * ==========================================================================
1919 zio_ddt_child_read_done(zio_t
*zio
)
1921 blkptr_t
*bp
= zio
->io_bp
;
1922 ddt_entry_t
*dde
= zio
->io_private
;
1924 zio_t
*pio
= zio_unique_parent(zio
);
1926 mutex_enter(&pio
->io_lock
);
1927 ddp
= ddt_phys_select(dde
, bp
);
1928 if (zio
->io_error
== 0)
1929 ddt_phys_clear(ddp
); /* this ddp doesn't need repair */
1930 if (zio
->io_error
== 0 && dde
->dde_repair_data
== NULL
)
1931 dde
->dde_repair_data
= zio
->io_data
;
1933 zio_buf_free(zio
->io_data
, zio
->io_size
);
1934 mutex_exit(&pio
->io_lock
);
1938 zio_ddt_read_start(zio_t
*zio
)
1940 blkptr_t
*bp
= zio
->io_bp
;
1943 ASSERT(BP_GET_DEDUP(bp
));
1944 ASSERT(BP_GET_PSIZE(bp
) == zio
->io_size
);
1945 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1947 if (zio
->io_child_error
[ZIO_CHILD_DDT
]) {
1948 ddt_t
*ddt
= ddt_select(zio
->io_spa
, bp
);
1949 ddt_entry_t
*dde
= ddt_repair_start(ddt
, bp
);
1950 ddt_phys_t
*ddp
= dde
->dde_phys
;
1951 ddt_phys_t
*ddp_self
= ddt_phys_select(dde
, bp
);
1954 ASSERT(zio
->io_vsd
== NULL
);
1957 if (ddp_self
== NULL
)
1958 return (ZIO_PIPELINE_CONTINUE
);
1960 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
1961 if (ddp
->ddp_phys_birth
== 0 || ddp
== ddp_self
)
1963 ddt_bp_create(ddt
->ddt_checksum
, &dde
->dde_key
, ddp
,
1965 zio_nowait(zio_read(zio
, zio
->io_spa
, &blk
,
1966 zio_buf_alloc(zio
->io_size
), zio
->io_size
,
1967 zio_ddt_child_read_done
, dde
, zio
->io_priority
,
1968 ZIO_DDT_CHILD_FLAGS(zio
) | ZIO_FLAG_DONT_PROPAGATE
,
1969 &zio
->io_bookmark
));
1971 return (ZIO_PIPELINE_CONTINUE
);
1974 zio_nowait(zio_read(zio
, zio
->io_spa
, bp
,
1975 zio
->io_data
, zio
->io_size
, NULL
, NULL
, zio
->io_priority
,
1976 ZIO_DDT_CHILD_FLAGS(zio
), &zio
->io_bookmark
));
1978 return (ZIO_PIPELINE_CONTINUE
);
1982 zio_ddt_read_done(zio_t
*zio
)
1984 blkptr_t
*bp
= zio
->io_bp
;
1986 if (zio_wait_for_children(zio
, ZIO_CHILD_DDT
, ZIO_WAIT_DONE
))
1987 return (ZIO_PIPELINE_STOP
);
1989 ASSERT(BP_GET_DEDUP(bp
));
1990 ASSERT(BP_GET_PSIZE(bp
) == zio
->io_size
);
1991 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1993 if (zio
->io_child_error
[ZIO_CHILD_DDT
]) {
1994 ddt_t
*ddt
= ddt_select(zio
->io_spa
, bp
);
1995 ddt_entry_t
*dde
= zio
->io_vsd
;
1997 ASSERT(spa_load_state(zio
->io_spa
) != SPA_LOAD_NONE
);
1998 return (ZIO_PIPELINE_CONTINUE
);
2001 zio
->io_stage
= ZIO_STAGE_DDT_READ_START
>> 1;
2002 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, B_FALSE
);
2003 return (ZIO_PIPELINE_STOP
);
2005 if (dde
->dde_repair_data
!= NULL
) {
2006 bcopy(dde
->dde_repair_data
, zio
->io_data
, zio
->io_size
);
2007 zio
->io_child_error
[ZIO_CHILD_DDT
] = 0;
2009 ddt_repair_done(ddt
, dde
);
2013 ASSERT(zio
->io_vsd
== NULL
);
2015 return (ZIO_PIPELINE_CONTINUE
);
2019 zio_ddt_collision(zio_t
*zio
, ddt_t
*ddt
, ddt_entry_t
*dde
)
2021 spa_t
*spa
= zio
->io_spa
;
2025 * Note: we compare the original data, not the transformed data,
2026 * because when zio->io_bp is an override bp, we will not have
2027 * pushed the I/O transforms. That's an important optimization
2028 * because otherwise we'd compress/encrypt all dmu_sync() data twice.
2030 for (p
= DDT_PHYS_SINGLE
; p
<= DDT_PHYS_TRIPLE
; p
++) {
2031 zio_t
*lio
= dde
->dde_lead_zio
[p
];
2034 return (lio
->io_orig_size
!= zio
->io_orig_size
||
2035 bcmp(zio
->io_orig_data
, lio
->io_orig_data
,
2036 zio
->io_orig_size
) != 0);
2040 for (p
= DDT_PHYS_SINGLE
; p
<= DDT_PHYS_TRIPLE
; p
++) {
2041 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
2043 if (ddp
->ddp_phys_birth
!= 0) {
2044 arc_buf_t
*abuf
= NULL
;
2045 uint32_t aflags
= ARC_WAIT
;
2046 blkptr_t blk
= *zio
->io_bp
;
2049 ddt_bp_fill(ddp
, &blk
, ddp
->ddp_phys_birth
);
2053 error
= arc_read(NULL
, spa
, &blk
,
2054 arc_getbuf_func
, &abuf
, ZIO_PRIORITY_SYNC_READ
,
2055 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
,
2056 &aflags
, &zio
->io_bookmark
);
2059 if (arc_buf_size(abuf
) != zio
->io_orig_size
||
2060 bcmp(abuf
->b_data
, zio
->io_orig_data
,
2061 zio
->io_orig_size
) != 0)
2063 VERIFY(arc_buf_remove_ref(abuf
, &abuf
) == 1);
2067 return (error
!= 0);
2075 zio_ddt_child_write_ready(zio_t
*zio
)
2077 int p
= zio
->io_prop
.zp_copies
;
2078 ddt_t
*ddt
= ddt_select(zio
->io_spa
, zio
->io_bp
);
2079 ddt_entry_t
*dde
= zio
->io_private
;
2080 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
2088 ASSERT(dde
->dde_lead_zio
[p
] == zio
);
2090 ddt_phys_fill(ddp
, zio
->io_bp
);
2092 while ((pio
= zio_walk_parents(zio
)) != NULL
)
2093 ddt_bp_fill(ddp
, pio
->io_bp
, zio
->io_txg
);
2099 zio_ddt_child_write_done(zio_t
*zio
)
2101 int p
= zio
->io_prop
.zp_copies
;
2102 ddt_t
*ddt
= ddt_select(zio
->io_spa
, zio
->io_bp
);
2103 ddt_entry_t
*dde
= zio
->io_private
;
2104 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
2108 ASSERT(ddp
->ddp_refcnt
== 0);
2109 ASSERT(dde
->dde_lead_zio
[p
] == zio
);
2110 dde
->dde_lead_zio
[p
] = NULL
;
2112 if (zio
->io_error
== 0) {
2113 while (zio_walk_parents(zio
) != NULL
)
2114 ddt_phys_addref(ddp
);
2116 ddt_phys_clear(ddp
);
2123 zio_ddt_ditto_write_done(zio_t
*zio
)
2125 int p
= DDT_PHYS_DITTO
;
2126 blkptr_t
*bp
= zio
->io_bp
;
2127 ddt_t
*ddt
= ddt_select(zio
->io_spa
, bp
);
2128 ddt_entry_t
*dde
= zio
->io_private
;
2129 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
2130 ddt_key_t
*ddk
= &dde
->dde_key
;
2131 ASSERTV(zio_prop_t
*zp
= &zio
->io_prop
);
2135 ASSERT(ddp
->ddp_refcnt
== 0);
2136 ASSERT(dde
->dde_lead_zio
[p
] == zio
);
2137 dde
->dde_lead_zio
[p
] = NULL
;
2139 if (zio
->io_error
== 0) {
2140 ASSERT(ZIO_CHECKSUM_EQUAL(bp
->blk_cksum
, ddk
->ddk_cksum
));
2141 ASSERT(zp
->zp_copies
< SPA_DVAS_PER_BP
);
2142 ASSERT(zp
->zp_copies
== BP_GET_NDVAS(bp
) - BP_IS_GANG(bp
));
2143 if (ddp
->ddp_phys_birth
!= 0)
2144 ddt_phys_free(ddt
, ddk
, ddp
, zio
->io_txg
);
2145 ddt_phys_fill(ddp
, bp
);
2152 zio_ddt_write(zio_t
*zio
)
2154 spa_t
*spa
= zio
->io_spa
;
2155 blkptr_t
*bp
= zio
->io_bp
;
2156 uint64_t txg
= zio
->io_txg
;
2157 zio_prop_t
*zp
= &zio
->io_prop
;
2158 int p
= zp
->zp_copies
;
2162 ddt_t
*ddt
= ddt_select(spa
, bp
);
2166 ASSERT(BP_GET_DEDUP(bp
));
2167 ASSERT(BP_GET_CHECKSUM(bp
) == zp
->zp_checksum
);
2168 ASSERT(BP_IS_HOLE(bp
) || zio
->io_bp_override
);
2171 dde
= ddt_lookup(ddt
, bp
, B_TRUE
);
2172 ddp
= &dde
->dde_phys
[p
];
2174 if (zp
->zp_dedup_verify
&& zio_ddt_collision(zio
, ddt
, dde
)) {
2176 * If we're using a weak checksum, upgrade to a strong checksum
2177 * and try again. If we're already using a strong checksum,
2178 * we can't resolve it, so just convert to an ordinary write.
2179 * (And automatically e-mail a paper to Nature?)
2181 if (!zio_checksum_table
[zp
->zp_checksum
].ci_dedup
) {
2182 zp
->zp_checksum
= spa_dedup_checksum(spa
);
2183 zio_pop_transforms(zio
);
2184 zio
->io_stage
= ZIO_STAGE_OPEN
;
2189 zio
->io_pipeline
= ZIO_WRITE_PIPELINE
;
2191 return (ZIO_PIPELINE_CONTINUE
);
2194 ditto_copies
= ddt_ditto_copies_needed(ddt
, dde
, ddp
);
2195 ASSERT(ditto_copies
< SPA_DVAS_PER_BP
);
2197 if (ditto_copies
> ddt_ditto_copies_present(dde
) &&
2198 dde
->dde_lead_zio
[DDT_PHYS_DITTO
] == NULL
) {
2199 zio_prop_t czp
= *zp
;
2201 czp
.zp_copies
= ditto_copies
;
2204 * If we arrived here with an override bp, we won't have run
2205 * the transform stack, so we won't have the data we need to
2206 * generate a child i/o. So, toss the override bp and restart.
2207 * This is safe, because using the override bp is just an
2208 * optimization; and it's rare, so the cost doesn't matter.
2210 if (zio
->io_bp_override
) {
2211 zio_pop_transforms(zio
);
2212 zio
->io_stage
= ZIO_STAGE_OPEN
;
2213 zio
->io_pipeline
= ZIO_WRITE_PIPELINE
;
2214 zio
->io_bp_override
= NULL
;
2217 return (ZIO_PIPELINE_CONTINUE
);
2220 dio
= zio_write(zio
, spa
, txg
, bp
, zio
->io_orig_data
,
2221 zio
->io_orig_size
, &czp
, NULL
,
2222 zio_ddt_ditto_write_done
, dde
, zio
->io_priority
,
2223 ZIO_DDT_CHILD_FLAGS(zio
), &zio
->io_bookmark
);
2225 zio_push_transform(dio
, zio
->io_data
, zio
->io_size
, 0, NULL
);
2226 dde
->dde_lead_zio
[DDT_PHYS_DITTO
] = dio
;
2229 if (ddp
->ddp_phys_birth
!= 0 || dde
->dde_lead_zio
[p
] != NULL
) {
2230 if (ddp
->ddp_phys_birth
!= 0)
2231 ddt_bp_fill(ddp
, bp
, txg
);
2232 if (dde
->dde_lead_zio
[p
] != NULL
)
2233 zio_add_child(zio
, dde
->dde_lead_zio
[p
]);
2235 ddt_phys_addref(ddp
);
2236 } else if (zio
->io_bp_override
) {
2237 ASSERT(bp
->blk_birth
== txg
);
2238 ASSERT(BP_EQUAL(bp
, zio
->io_bp_override
));
2239 ddt_phys_fill(ddp
, bp
);
2240 ddt_phys_addref(ddp
);
2242 cio
= zio_write(zio
, spa
, txg
, bp
, zio
->io_orig_data
,
2243 zio
->io_orig_size
, zp
, zio_ddt_child_write_ready
,
2244 zio_ddt_child_write_done
, dde
, zio
->io_priority
,
2245 ZIO_DDT_CHILD_FLAGS(zio
), &zio
->io_bookmark
);
2247 zio_push_transform(cio
, zio
->io_data
, zio
->io_size
, 0, NULL
);
2248 dde
->dde_lead_zio
[p
] = cio
;
2258 return (ZIO_PIPELINE_CONTINUE
);
2261 ddt_entry_t
*freedde
; /* for debugging */
2264 zio_ddt_free(zio_t
*zio
)
2266 spa_t
*spa
= zio
->io_spa
;
2267 blkptr_t
*bp
= zio
->io_bp
;
2268 ddt_t
*ddt
= ddt_select(spa
, bp
);
2272 ASSERT(BP_GET_DEDUP(bp
));
2273 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
2276 freedde
= dde
= ddt_lookup(ddt
, bp
, B_TRUE
);
2278 ddp
= ddt_phys_select(dde
, bp
);
2280 ddt_phys_decref(ddp
);
2284 return (ZIO_PIPELINE_CONTINUE
);
2288 * ==========================================================================
2289 * Allocate and free blocks
2290 * ==========================================================================
2293 zio_dva_allocate(zio_t
*zio
)
2295 spa_t
*spa
= zio
->io_spa
;
2296 metaslab_class_t
*mc
= spa_normal_class(spa
);
2297 blkptr_t
*bp
= zio
->io_bp
;
2301 if (zio
->io_gang_leader
== NULL
) {
2302 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
2303 zio
->io_gang_leader
= zio
;
2306 ASSERT(BP_IS_HOLE(bp
));
2307 ASSERT0(BP_GET_NDVAS(bp
));
2308 ASSERT3U(zio
->io_prop
.zp_copies
, >, 0);
2309 ASSERT3U(zio
->io_prop
.zp_copies
, <=, spa_max_replication(spa
));
2310 ASSERT3U(zio
->io_size
, ==, BP_GET_PSIZE(bp
));
2313 * The dump device does not support gang blocks so allocation on
2314 * behalf of the dump device (i.e. ZIO_FLAG_NODATA) must avoid
2315 * the "fast" gang feature.
2317 flags
|= (zio
->io_flags
& ZIO_FLAG_NODATA
) ? METASLAB_GANG_AVOID
: 0;
2318 flags
|= (zio
->io_flags
& ZIO_FLAG_GANG_CHILD
) ?
2319 METASLAB_GANG_CHILD
: 0;
2320 flags
|= (zio
->io_flags
& ZIO_FLAG_FASTWRITE
) ? METASLAB_FASTWRITE
: 0;
2321 error
= metaslab_alloc(spa
, mc
, zio
->io_size
, bp
,
2322 zio
->io_prop
.zp_copies
, zio
->io_txg
, NULL
, flags
);
2325 spa_dbgmsg(spa
, "%s: metaslab allocation failure: zio %p, "
2326 "size %llu, error %d", spa_name(spa
), zio
, zio
->io_size
,
2328 if (error
== ENOSPC
&& zio
->io_size
> SPA_MINBLOCKSIZE
)
2329 return (zio_write_gang_block(zio
));
2330 zio
->io_error
= error
;
2333 return (ZIO_PIPELINE_CONTINUE
);
2337 zio_dva_free(zio_t
*zio
)
2339 metaslab_free(zio
->io_spa
, zio
->io_bp
, zio
->io_txg
, B_FALSE
);
2341 return (ZIO_PIPELINE_CONTINUE
);
2345 zio_dva_claim(zio_t
*zio
)
2349 error
= metaslab_claim(zio
->io_spa
, zio
->io_bp
, zio
->io_txg
);
2351 zio
->io_error
= error
;
2353 return (ZIO_PIPELINE_CONTINUE
);
2357 * Undo an allocation. This is used by zio_done() when an I/O fails
2358 * and we want to give back the block we just allocated.
2359 * This handles both normal blocks and gang blocks.
2362 zio_dva_unallocate(zio_t
*zio
, zio_gang_node_t
*gn
, blkptr_t
*bp
)
2366 ASSERT(bp
->blk_birth
== zio
->io_txg
|| BP_IS_HOLE(bp
));
2367 ASSERT(zio
->io_bp_override
== NULL
);
2369 if (!BP_IS_HOLE(bp
))
2370 metaslab_free(zio
->io_spa
, bp
, bp
->blk_birth
, B_TRUE
);
2373 for (g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++) {
2374 zio_dva_unallocate(zio
, gn
->gn_child
[g
],
2375 &gn
->gn_gbh
->zg_blkptr
[g
]);
2381 * Try to allocate an intent log block. Return 0 on success, errno on failure.
2384 zio_alloc_zil(spa_t
*spa
, uint64_t txg
, blkptr_t
*new_bp
, uint64_t size
,
2389 ASSERT(txg
> spa_syncing_txg(spa
));
2392 * ZIL blocks are always contiguous (i.e. not gang blocks) so we
2393 * set the METASLAB_GANG_AVOID flag so that they don't "fast gang"
2394 * when allocating them.
2397 error
= metaslab_alloc(spa
, spa_log_class(spa
), size
,
2398 new_bp
, 1, txg
, NULL
,
2399 METASLAB_FASTWRITE
| METASLAB_GANG_AVOID
);
2403 error
= metaslab_alloc(spa
, spa_normal_class(spa
), size
,
2404 new_bp
, 1, txg
, NULL
,
2405 METASLAB_FASTWRITE
| METASLAB_GANG_AVOID
);
2409 BP_SET_LSIZE(new_bp
, size
);
2410 BP_SET_PSIZE(new_bp
, size
);
2411 BP_SET_COMPRESS(new_bp
, ZIO_COMPRESS_OFF
);
2412 BP_SET_CHECKSUM(new_bp
,
2413 spa_version(spa
) >= SPA_VERSION_SLIM_ZIL
2414 ? ZIO_CHECKSUM_ZILOG2
: ZIO_CHECKSUM_ZILOG
);
2415 BP_SET_TYPE(new_bp
, DMU_OT_INTENT_LOG
);
2416 BP_SET_LEVEL(new_bp
, 0);
2417 BP_SET_DEDUP(new_bp
, 0);
2418 BP_SET_BYTEORDER(new_bp
, ZFS_HOST_BYTEORDER
);
2425 * Free an intent log block.
2428 zio_free_zil(spa_t
*spa
, uint64_t txg
, blkptr_t
*bp
)
2430 ASSERT(BP_GET_TYPE(bp
) == DMU_OT_INTENT_LOG
);
2431 ASSERT(!BP_IS_GANG(bp
));
2433 zio_free(spa
, txg
, bp
);
2437 * ==========================================================================
2438 * Read and write to physical devices
2439 * ==========================================================================
2442 zio_vdev_io_start(zio_t
*zio
)
2444 vdev_t
*vd
= zio
->io_vd
;
2446 spa_t
*spa
= zio
->io_spa
;
2448 ASSERT(zio
->io_error
== 0);
2449 ASSERT(zio
->io_child_error
[ZIO_CHILD_VDEV
] == 0);
2452 if (!(zio
->io_flags
& ZIO_FLAG_CONFIG_WRITER
))
2453 spa_config_enter(spa
, SCL_ZIO
, zio
, RW_READER
);
2456 * The mirror_ops handle multiple DVAs in a single BP.
2458 return (vdev_mirror_ops
.vdev_op_io_start(zio
));
2462 * We keep track of time-sensitive I/Os so that the scan thread
2463 * can quickly react to certain workloads. In particular, we care
2464 * about non-scrubbing, top-level reads and writes with the following
2466 * - synchronous writes of user data to non-slog devices
2467 * - any reads of user data
2468 * When these conditions are met, adjust the timestamp of spa_last_io
2469 * which allows the scan thread to adjust its workload accordingly.
2471 if (!(zio
->io_flags
& ZIO_FLAG_SCAN_THREAD
) && zio
->io_bp
!= NULL
&&
2472 vd
== vd
->vdev_top
&& !vd
->vdev_islog
&&
2473 zio
->io_bookmark
.zb_objset
!= DMU_META_OBJSET
&&
2474 zio
->io_txg
!= spa_syncing_txg(spa
)) {
2475 uint64_t old
= spa
->spa_last_io
;
2476 uint64_t new = ddi_get_lbolt64();
2478 (void) atomic_cas_64(&spa
->spa_last_io
, old
, new);
2481 align
= 1ULL << vd
->vdev_top
->vdev_ashift
;
2483 if (P2PHASE(zio
->io_size
, align
) != 0) {
2484 uint64_t asize
= P2ROUNDUP(zio
->io_size
, align
);
2485 char *abuf
= zio_buf_alloc(asize
);
2486 ASSERT(vd
== vd
->vdev_top
);
2487 if (zio
->io_type
== ZIO_TYPE_WRITE
) {
2488 bcopy(zio
->io_data
, abuf
, zio
->io_size
);
2489 bzero(abuf
+ zio
->io_size
, asize
- zio
->io_size
);
2491 zio_push_transform(zio
, abuf
, asize
, asize
, zio_subblock
);
2494 ASSERT(P2PHASE(zio
->io_offset
, align
) == 0);
2495 ASSERT(P2PHASE(zio
->io_size
, align
) == 0);
2496 VERIFY(zio
->io_type
!= ZIO_TYPE_WRITE
|| spa_writeable(spa
));
2499 * If this is a repair I/O, and there's no self-healing involved --
2500 * that is, we're just resilvering what we expect to resilver --
2501 * then don't do the I/O unless zio's txg is actually in vd's DTL.
2502 * This prevents spurious resilvering with nested replication.
2503 * For example, given a mirror of mirrors, (A+B)+(C+D), if only
2504 * A is out of date, we'll read from C+D, then use the data to
2505 * resilver A+B -- but we don't actually want to resilver B, just A.
2506 * The top-level mirror has no way to know this, so instead we just
2507 * discard unnecessary repairs as we work our way down the vdev tree.
2508 * The same logic applies to any form of nested replication:
2509 * ditto + mirror, RAID-Z + replacing, etc. This covers them all.
2511 if ((zio
->io_flags
& ZIO_FLAG_IO_REPAIR
) &&
2512 !(zio
->io_flags
& ZIO_FLAG_SELF_HEAL
) &&
2513 zio
->io_txg
!= 0 && /* not a delegated i/o */
2514 !vdev_dtl_contains(vd
, DTL_PARTIAL
, zio
->io_txg
, 1)) {
2515 ASSERT(zio
->io_type
== ZIO_TYPE_WRITE
);
2516 zio_vdev_io_bypass(zio
);
2517 return (ZIO_PIPELINE_CONTINUE
);
2520 if (vd
->vdev_ops
->vdev_op_leaf
&&
2521 (zio
->io_type
== ZIO_TYPE_READ
|| zio
->io_type
== ZIO_TYPE_WRITE
)) {
2523 if (zio
->io_type
== ZIO_TYPE_READ
&& vdev_cache_read(zio
) == 0)
2524 return (ZIO_PIPELINE_CONTINUE
);
2526 if ((zio
= vdev_queue_io(zio
)) == NULL
)
2527 return (ZIO_PIPELINE_STOP
);
2529 if (!vdev_accessible(vd
, zio
)) {
2530 zio
->io_error
= ENXIO
;
2532 return (ZIO_PIPELINE_STOP
);
2536 return (vd
->vdev_ops
->vdev_op_io_start(zio
));
2540 zio_vdev_io_done(zio_t
*zio
)
2542 vdev_t
*vd
= zio
->io_vd
;
2543 vdev_ops_t
*ops
= vd
? vd
->vdev_ops
: &vdev_mirror_ops
;
2544 boolean_t unexpected_error
= B_FALSE
;
2546 if (zio_wait_for_children(zio
, ZIO_CHILD_VDEV
, ZIO_WAIT_DONE
))
2547 return (ZIO_PIPELINE_STOP
);
2549 ASSERT(zio
->io_type
== ZIO_TYPE_READ
|| zio
->io_type
== ZIO_TYPE_WRITE
);
2551 if (vd
!= NULL
&& vd
->vdev_ops
->vdev_op_leaf
) {
2553 vdev_queue_io_done(zio
);
2555 if (zio
->io_type
== ZIO_TYPE_WRITE
)
2556 vdev_cache_write(zio
);
2558 if (zio_injection_enabled
&& zio
->io_error
== 0)
2559 zio
->io_error
= zio_handle_device_injection(vd
,
2562 if (zio_injection_enabled
&& zio
->io_error
== 0)
2563 zio
->io_error
= zio_handle_label_injection(zio
, EIO
);
2565 if (zio
->io_error
) {
2566 if (!vdev_accessible(vd
, zio
)) {
2567 zio
->io_error
= ENXIO
;
2569 unexpected_error
= B_TRUE
;
2574 ops
->vdev_op_io_done(zio
);
2576 if (unexpected_error
)
2577 VERIFY(vdev_probe(vd
, zio
) == NULL
);
2579 return (ZIO_PIPELINE_CONTINUE
);
2583 * For non-raidz ZIOs, we can just copy aside the bad data read from the
2584 * disk, and use that to finish the checksum ereport later.
2587 zio_vsd_default_cksum_finish(zio_cksum_report_t
*zcr
,
2588 const void *good_buf
)
2590 /* no processing needed */
2591 zfs_ereport_finish_checksum(zcr
, good_buf
, zcr
->zcr_cbdata
, B_FALSE
);
2596 zio_vsd_default_cksum_report(zio_t
*zio
, zio_cksum_report_t
*zcr
, void *ignored
)
2598 void *buf
= zio_buf_alloc(zio
->io_size
);
2600 bcopy(zio
->io_data
, buf
, zio
->io_size
);
2602 zcr
->zcr_cbinfo
= zio
->io_size
;
2603 zcr
->zcr_cbdata
= buf
;
2604 zcr
->zcr_finish
= zio_vsd_default_cksum_finish
;
2605 zcr
->zcr_free
= zio_buf_free
;
2609 zio_vdev_io_assess(zio_t
*zio
)
2611 vdev_t
*vd
= zio
->io_vd
;
2613 if (zio_wait_for_children(zio
, ZIO_CHILD_VDEV
, ZIO_WAIT_DONE
))
2614 return (ZIO_PIPELINE_STOP
);
2616 if (vd
== NULL
&& !(zio
->io_flags
& ZIO_FLAG_CONFIG_WRITER
))
2617 spa_config_exit(zio
->io_spa
, SCL_ZIO
, zio
);
2619 if (zio
->io_vsd
!= NULL
) {
2620 zio
->io_vsd_ops
->vsd_free(zio
);
2624 if (zio_injection_enabled
&& zio
->io_error
== 0)
2625 zio
->io_error
= zio_handle_fault_injection(zio
, EIO
);
2628 * If the I/O failed, determine whether we should attempt to retry it.
2630 * On retry, we cut in line in the issue queue, since we don't want
2631 * compression/checksumming/etc. work to prevent our (cheap) IO reissue.
2633 if (zio
->io_error
&& vd
== NULL
&&
2634 !(zio
->io_flags
& (ZIO_FLAG_DONT_RETRY
| ZIO_FLAG_IO_RETRY
))) {
2635 ASSERT(!(zio
->io_flags
& ZIO_FLAG_DONT_QUEUE
)); /* not a leaf */
2636 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_BYPASS
)); /* not a leaf */
2638 zio
->io_flags
|= ZIO_FLAG_IO_RETRY
|
2639 ZIO_FLAG_DONT_CACHE
| ZIO_FLAG_DONT_AGGREGATE
;
2640 zio
->io_stage
= ZIO_STAGE_VDEV_IO_START
>> 1;
2641 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
,
2642 zio_requeue_io_start_cut_in_line
);
2643 return (ZIO_PIPELINE_STOP
);
2647 * If we got an error on a leaf device, convert it to ENXIO
2648 * if the device is not accessible at all.
2650 if (zio
->io_error
&& vd
!= NULL
&& vd
->vdev_ops
->vdev_op_leaf
&&
2651 !vdev_accessible(vd
, zio
))
2652 zio
->io_error
= ENXIO
;
2655 * If we can't write to an interior vdev (mirror or RAID-Z),
2656 * set vdev_cant_write so that we stop trying to allocate from it.
2658 if (zio
->io_error
== ENXIO
&& zio
->io_type
== ZIO_TYPE_WRITE
&&
2659 vd
!= NULL
&& !vd
->vdev_ops
->vdev_op_leaf
)
2660 vd
->vdev_cant_write
= B_TRUE
;
2663 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
2665 return (ZIO_PIPELINE_CONTINUE
);
2669 zio_vdev_io_reissue(zio_t
*zio
)
2671 ASSERT(zio
->io_stage
== ZIO_STAGE_VDEV_IO_START
);
2672 ASSERT(zio
->io_error
== 0);
2674 zio
->io_stage
>>= 1;
2678 zio_vdev_io_redone(zio_t
*zio
)
2680 ASSERT(zio
->io_stage
== ZIO_STAGE_VDEV_IO_DONE
);
2682 zio
->io_stage
>>= 1;
2686 zio_vdev_io_bypass(zio_t
*zio
)
2688 ASSERT(zio
->io_stage
== ZIO_STAGE_VDEV_IO_START
);
2689 ASSERT(zio
->io_error
== 0);
2691 zio
->io_flags
|= ZIO_FLAG_IO_BYPASS
;
2692 zio
->io_stage
= ZIO_STAGE_VDEV_IO_ASSESS
>> 1;
2696 * ==========================================================================
2697 * Generate and verify checksums
2698 * ==========================================================================
2701 zio_checksum_generate(zio_t
*zio
)
2703 blkptr_t
*bp
= zio
->io_bp
;
2704 enum zio_checksum checksum
;
2708 * This is zio_write_phys().
2709 * We're either generating a label checksum, or none at all.
2711 checksum
= zio
->io_prop
.zp_checksum
;
2713 if (checksum
== ZIO_CHECKSUM_OFF
)
2714 return (ZIO_PIPELINE_CONTINUE
);
2716 ASSERT(checksum
== ZIO_CHECKSUM_LABEL
);
2718 if (BP_IS_GANG(bp
) && zio
->io_child_type
== ZIO_CHILD_GANG
) {
2719 ASSERT(!IO_IS_ALLOCATING(zio
));
2720 checksum
= ZIO_CHECKSUM_GANG_HEADER
;
2722 checksum
= BP_GET_CHECKSUM(bp
);
2726 zio_checksum_compute(zio
, checksum
, zio
->io_data
, zio
->io_size
);
2728 return (ZIO_PIPELINE_CONTINUE
);
2732 zio_checksum_verify(zio_t
*zio
)
2734 zio_bad_cksum_t info
;
2735 blkptr_t
*bp
= zio
->io_bp
;
2738 ASSERT(zio
->io_vd
!= NULL
);
2742 * This is zio_read_phys().
2743 * We're either verifying a label checksum, or nothing at all.
2745 if (zio
->io_prop
.zp_checksum
== ZIO_CHECKSUM_OFF
)
2746 return (ZIO_PIPELINE_CONTINUE
);
2748 ASSERT(zio
->io_prop
.zp_checksum
== ZIO_CHECKSUM_LABEL
);
2751 if ((error
= zio_checksum_error(zio
, &info
)) != 0) {
2752 zio
->io_error
= error
;
2753 if (!(zio
->io_flags
& ZIO_FLAG_SPECULATIVE
)) {
2754 zfs_ereport_start_checksum(zio
->io_spa
,
2755 zio
->io_vd
, zio
, zio
->io_offset
,
2756 zio
->io_size
, NULL
, &info
);
2760 return (ZIO_PIPELINE_CONTINUE
);
2764 * Called by RAID-Z to ensure we don't compute the checksum twice.
2767 zio_checksum_verified(zio_t
*zio
)
2769 zio
->io_pipeline
&= ~ZIO_STAGE_CHECKSUM_VERIFY
;
2773 * ==========================================================================
2774 * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other.
2775 * An error of 0 indictes success. ENXIO indicates whole-device failure,
2776 * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO
2777 * indicate errors that are specific to one I/O, and most likely permanent.
2778 * Any other error is presumed to be worse because we weren't expecting it.
2779 * ==========================================================================
2782 zio_worst_error(int e1
, int e2
)
2784 static int zio_error_rank
[] = { 0, ENXIO
, ECKSUM
, EIO
};
2787 for (r1
= 0; r1
< sizeof (zio_error_rank
) / sizeof (int); r1
++)
2788 if (e1
== zio_error_rank
[r1
])
2791 for (r2
= 0; r2
< sizeof (zio_error_rank
) / sizeof (int); r2
++)
2792 if (e2
== zio_error_rank
[r2
])
2795 return (r1
> r2
? e1
: e2
);
2799 * ==========================================================================
2801 * ==========================================================================
2804 zio_ready(zio_t
*zio
)
2806 blkptr_t
*bp
= zio
->io_bp
;
2807 zio_t
*pio
, *pio_next
;
2809 if (zio_wait_for_children(zio
, ZIO_CHILD_GANG
, ZIO_WAIT_READY
) ||
2810 zio_wait_for_children(zio
, ZIO_CHILD_DDT
, ZIO_WAIT_READY
))
2811 return (ZIO_PIPELINE_STOP
);
2813 if (zio
->io_ready
) {
2814 ASSERT(IO_IS_ALLOCATING(zio
));
2815 ASSERT(bp
->blk_birth
== zio
->io_txg
|| BP_IS_HOLE(bp
));
2816 ASSERT(zio
->io_children
[ZIO_CHILD_GANG
][ZIO_WAIT_READY
] == 0);
2821 if (bp
!= NULL
&& bp
!= &zio
->io_bp_copy
)
2822 zio
->io_bp_copy
= *bp
;
2825 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
2827 mutex_enter(&zio
->io_lock
);
2828 zio
->io_state
[ZIO_WAIT_READY
] = 1;
2829 pio
= zio_walk_parents(zio
);
2830 mutex_exit(&zio
->io_lock
);
2833 * As we notify zio's parents, new parents could be added.
2834 * New parents go to the head of zio's io_parent_list, however,
2835 * so we will (correctly) not notify them. The remainder of zio's
2836 * io_parent_list, from 'pio_next' onward, cannot change because
2837 * all parents must wait for us to be done before they can be done.
2839 for (; pio
!= NULL
; pio
= pio_next
) {
2840 pio_next
= zio_walk_parents(zio
);
2841 zio_notify_parent(pio
, zio
, ZIO_WAIT_READY
);
2844 if (zio
->io_flags
& ZIO_FLAG_NODATA
) {
2845 if (BP_IS_GANG(bp
)) {
2846 zio
->io_flags
&= ~ZIO_FLAG_NODATA
;
2848 ASSERT((uintptr_t)zio
->io_data
< SPA_MAXBLOCKSIZE
);
2849 zio
->io_pipeline
&= ~ZIO_VDEV_IO_STAGES
;
2853 if (zio_injection_enabled
&&
2854 zio
->io_spa
->spa_syncing_txg
== zio
->io_txg
)
2855 zio_handle_ignored_writes(zio
);
2857 return (ZIO_PIPELINE_CONTINUE
);
2861 zio_done(zio_t
*zio
)
2863 zio_t
*pio
, *pio_next
;
2867 * If our children haven't all completed,
2868 * wait for them and then repeat this pipeline stage.
2870 if (zio_wait_for_children(zio
, ZIO_CHILD_VDEV
, ZIO_WAIT_DONE
) ||
2871 zio_wait_for_children(zio
, ZIO_CHILD_GANG
, ZIO_WAIT_DONE
) ||
2872 zio_wait_for_children(zio
, ZIO_CHILD_DDT
, ZIO_WAIT_DONE
) ||
2873 zio_wait_for_children(zio
, ZIO_CHILD_LOGICAL
, ZIO_WAIT_DONE
))
2874 return (ZIO_PIPELINE_STOP
);
2876 for (c
= 0; c
< ZIO_CHILD_TYPES
; c
++)
2877 for (w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
2878 ASSERT(zio
->io_children
[c
][w
] == 0);
2880 if (zio
->io_bp
!= NULL
) {
2881 ASSERT(zio
->io_bp
->blk_pad
[0] == 0);
2882 ASSERT(zio
->io_bp
->blk_pad
[1] == 0);
2883 ASSERT(bcmp(zio
->io_bp
, &zio
->io_bp_copy
, sizeof (blkptr_t
)) == 0 ||
2884 (zio
->io_bp
== zio_unique_parent(zio
)->io_bp
));
2885 if (zio
->io_type
== ZIO_TYPE_WRITE
&& !BP_IS_HOLE(zio
->io_bp
) &&
2886 zio
->io_bp_override
== NULL
&&
2887 !(zio
->io_flags
& ZIO_FLAG_IO_REPAIR
)) {
2888 ASSERT(!BP_SHOULD_BYTESWAP(zio
->io_bp
));
2889 ASSERT3U(zio
->io_prop
.zp_copies
, <=, BP_GET_NDVAS(zio
->io_bp
));
2890 ASSERT(BP_COUNT_GANG(zio
->io_bp
) == 0 ||
2891 (BP_COUNT_GANG(zio
->io_bp
) == BP_GET_NDVAS(zio
->io_bp
)));
2896 * If there were child vdev/gang/ddt errors, they apply to us now.
2898 zio_inherit_child_errors(zio
, ZIO_CHILD_VDEV
);
2899 zio_inherit_child_errors(zio
, ZIO_CHILD_GANG
);
2900 zio_inherit_child_errors(zio
, ZIO_CHILD_DDT
);
2903 * If the I/O on the transformed data was successful, generate any
2904 * checksum reports now while we still have the transformed data.
2906 if (zio
->io_error
== 0) {
2907 while (zio
->io_cksum_report
!= NULL
) {
2908 zio_cksum_report_t
*zcr
= zio
->io_cksum_report
;
2909 uint64_t align
= zcr
->zcr_align
;
2910 uint64_t asize
= P2ROUNDUP(zio
->io_size
, align
);
2911 char *abuf
= zio
->io_data
;
2913 if (asize
!= zio
->io_size
) {
2914 abuf
= zio_buf_alloc(asize
);
2915 bcopy(zio
->io_data
, abuf
, zio
->io_size
);
2916 bzero(abuf
+ zio
->io_size
, asize
- zio
->io_size
);
2919 zio
->io_cksum_report
= zcr
->zcr_next
;
2920 zcr
->zcr_next
= NULL
;
2921 zcr
->zcr_finish(zcr
, abuf
);
2922 zfs_ereport_free_checksum(zcr
);
2924 if (asize
!= zio
->io_size
)
2925 zio_buf_free(abuf
, asize
);
2929 zio_pop_transforms(zio
); /* note: may set zio->io_error */
2931 vdev_stat_update(zio
, zio
->io_size
);
2934 * If this I/O is attached to a particular vdev is slow, exceeding
2935 * 30 seconds to complete, post an error described the I/O delay.
2936 * We ignore these errors if the device is currently unavailable.
2938 if (zio
->io_delay
>= MSEC_TO_TICK(zio_delay_max
)) {
2939 if (zio
->io_vd
!= NULL
&& !vdev_is_dead(zio
->io_vd
))
2940 zfs_ereport_post(FM_EREPORT_ZFS_DELAY
, zio
->io_spa
,
2941 zio
->io_vd
, zio
, 0, 0);
2944 if (zio
->io_error
) {
2946 * If this I/O is attached to a particular vdev,
2947 * generate an error message describing the I/O failure
2948 * at the block level. We ignore these errors if the
2949 * device is currently unavailable.
2951 if (zio
->io_error
!= ECKSUM
&& zio
->io_vd
!= NULL
&&
2952 !vdev_is_dead(zio
->io_vd
))
2953 zfs_ereport_post(FM_EREPORT_ZFS_IO
, zio
->io_spa
,
2954 zio
->io_vd
, zio
, 0, 0);
2956 if ((zio
->io_error
== EIO
|| !(zio
->io_flags
&
2957 (ZIO_FLAG_SPECULATIVE
| ZIO_FLAG_DONT_PROPAGATE
))) &&
2958 zio
== zio
->io_logical
) {
2960 * For logical I/O requests, tell the SPA to log the
2961 * error and generate a logical data ereport.
2963 spa_log_error(zio
->io_spa
, zio
);
2964 zfs_ereport_post(FM_EREPORT_ZFS_DATA
, zio
->io_spa
, NULL
, zio
,
2969 if (zio
->io_error
&& zio
== zio
->io_logical
) {
2971 * Determine whether zio should be reexecuted. This will
2972 * propagate all the way to the root via zio_notify_parent().
2974 ASSERT(zio
->io_vd
== NULL
&& zio
->io_bp
!= NULL
);
2975 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
2977 if (IO_IS_ALLOCATING(zio
) &&
2978 !(zio
->io_flags
& ZIO_FLAG_CANFAIL
)) {
2979 if (zio
->io_error
!= ENOSPC
)
2980 zio
->io_reexecute
|= ZIO_REEXECUTE_NOW
;
2982 zio
->io_reexecute
|= ZIO_REEXECUTE_SUSPEND
;
2985 if ((zio
->io_type
== ZIO_TYPE_READ
||
2986 zio
->io_type
== ZIO_TYPE_FREE
) &&
2987 !(zio
->io_flags
& ZIO_FLAG_SCAN_THREAD
) &&
2988 zio
->io_error
== ENXIO
&&
2989 spa_load_state(zio
->io_spa
) == SPA_LOAD_NONE
&&
2990 spa_get_failmode(zio
->io_spa
) != ZIO_FAILURE_MODE_CONTINUE
)
2991 zio
->io_reexecute
|= ZIO_REEXECUTE_SUSPEND
;
2993 if (!(zio
->io_flags
& ZIO_FLAG_CANFAIL
) && !zio
->io_reexecute
)
2994 zio
->io_reexecute
|= ZIO_REEXECUTE_SUSPEND
;
2997 * Here is a possibly good place to attempt to do
2998 * either combinatorial reconstruction or error correction
2999 * based on checksums. It also might be a good place
3000 * to send out preliminary ereports before we suspend
3006 * If there were logical child errors, they apply to us now.
3007 * We defer this until now to avoid conflating logical child
3008 * errors with errors that happened to the zio itself when
3009 * updating vdev stats and reporting FMA events above.
3011 zio_inherit_child_errors(zio
, ZIO_CHILD_LOGICAL
);
3013 if ((zio
->io_error
|| zio
->io_reexecute
) &&
3014 IO_IS_ALLOCATING(zio
) && zio
->io_gang_leader
== zio
&&
3015 !(zio
->io_flags
& ZIO_FLAG_IO_REWRITE
))
3016 zio_dva_unallocate(zio
, zio
->io_gang_tree
, zio
->io_bp
);
3018 zio_gang_tree_free(&zio
->io_gang_tree
);
3021 * Godfather I/Os should never suspend.
3023 if ((zio
->io_flags
& ZIO_FLAG_GODFATHER
) &&
3024 (zio
->io_reexecute
& ZIO_REEXECUTE_SUSPEND
))
3025 zio
->io_reexecute
= 0;
3027 if (zio
->io_reexecute
) {
3029 * This is a logical I/O that wants to reexecute.
3031 * Reexecute is top-down. When an i/o fails, if it's not
3032 * the root, it simply notifies its parent and sticks around.
3033 * The parent, seeing that it still has children in zio_done(),
3034 * does the same. This percolates all the way up to the root.
3035 * The root i/o will reexecute or suspend the entire tree.
3037 * This approach ensures that zio_reexecute() honors
3038 * all the original i/o dependency relationships, e.g.
3039 * parents not executing until children are ready.
3041 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
3043 zio
->io_gang_leader
= NULL
;
3045 mutex_enter(&zio
->io_lock
);
3046 zio
->io_state
[ZIO_WAIT_DONE
] = 1;
3047 mutex_exit(&zio
->io_lock
);
3050 * "The Godfather" I/O monitors its children but is
3051 * not a true parent to them. It will track them through
3052 * the pipeline but severs its ties whenever they get into
3053 * trouble (e.g. suspended). This allows "The Godfather"
3054 * I/O to return status without blocking.
3056 for (pio
= zio_walk_parents(zio
); pio
!= NULL
; pio
= pio_next
) {
3057 zio_link_t
*zl
= zio
->io_walk_link
;
3058 pio_next
= zio_walk_parents(zio
);
3060 if ((pio
->io_flags
& ZIO_FLAG_GODFATHER
) &&
3061 (zio
->io_reexecute
& ZIO_REEXECUTE_SUSPEND
)) {
3062 zio_remove_child(pio
, zio
, zl
);
3063 zio_notify_parent(pio
, zio
, ZIO_WAIT_DONE
);
3067 if ((pio
= zio_unique_parent(zio
)) != NULL
) {
3069 * We're not a root i/o, so there's nothing to do
3070 * but notify our parent. Don't propagate errors
3071 * upward since we haven't permanently failed yet.
3073 ASSERT(!(zio
->io_flags
& ZIO_FLAG_GODFATHER
));
3074 zio
->io_flags
|= ZIO_FLAG_DONT_PROPAGATE
;
3075 zio_notify_parent(pio
, zio
, ZIO_WAIT_DONE
);
3076 } else if (zio
->io_reexecute
& ZIO_REEXECUTE_SUSPEND
) {
3078 * We'd fail again if we reexecuted now, so suspend
3079 * until conditions improve (e.g. device comes online).
3081 zio_suspend(zio
->io_spa
, zio
);
3084 * Reexecution is potentially a huge amount of work.
3085 * Hand it off to the otherwise-unused claim taskq.
3087 ASSERT(taskq_empty_ent(&zio
->io_tqent
));
3088 spa_taskq_dispatch_ent(zio
->io_spa
,
3089 ZIO_TYPE_CLAIM
, ZIO_TASKQ_ISSUE
,
3090 (task_func_t
*)zio_reexecute
, zio
, 0,
3093 return (ZIO_PIPELINE_STOP
);
3096 ASSERT(zio
->io_child_count
== 0);
3097 ASSERT(zio
->io_reexecute
== 0);
3098 ASSERT(zio
->io_error
== 0 || (zio
->io_flags
& ZIO_FLAG_CANFAIL
));
3101 * Report any checksum errors, since the I/O is complete.
3103 while (zio
->io_cksum_report
!= NULL
) {
3104 zio_cksum_report_t
*zcr
= zio
->io_cksum_report
;
3105 zio
->io_cksum_report
= zcr
->zcr_next
;
3106 zcr
->zcr_next
= NULL
;
3107 zcr
->zcr_finish(zcr
, NULL
);
3108 zfs_ereport_free_checksum(zcr
);
3111 if (zio
->io_flags
& ZIO_FLAG_FASTWRITE
&& zio
->io_bp
&&
3112 !BP_IS_HOLE(zio
->io_bp
)) {
3113 metaslab_fastwrite_unmark(zio
->io_spa
, zio
->io_bp
);
3117 * It is the responsibility of the done callback to ensure that this
3118 * particular zio is no longer discoverable for adoption, and as
3119 * such, cannot acquire any new parents.
3124 mutex_enter(&zio
->io_lock
);
3125 zio
->io_state
[ZIO_WAIT_DONE
] = 1;
3126 mutex_exit(&zio
->io_lock
);
3128 for (pio
= zio_walk_parents(zio
); pio
!= NULL
; pio
= pio_next
) {
3129 zio_link_t
*zl
= zio
->io_walk_link
;
3130 pio_next
= zio_walk_parents(zio
);
3131 zio_remove_child(pio
, zio
, zl
);
3132 zio_notify_parent(pio
, zio
, ZIO_WAIT_DONE
);
3135 if (zio
->io_waiter
!= NULL
) {
3136 mutex_enter(&zio
->io_lock
);
3137 zio
->io_executor
= NULL
;
3138 cv_broadcast(&zio
->io_cv
);
3139 mutex_exit(&zio
->io_lock
);
3144 return (ZIO_PIPELINE_STOP
);
3148 * ==========================================================================
3149 * I/O pipeline definition
3150 * ==========================================================================
3152 static zio_pipe_stage_t
*zio_pipeline
[] = {
3158 zio_checksum_generate
,
3172 zio_checksum_verify
,
3176 /* dnp is the dnode for zb1->zb_object */
3178 zbookmark_is_before(const dnode_phys_t
*dnp
, const zbookmark_t
*zb1
,
3179 const zbookmark_t
*zb2
)
3181 uint64_t zb1nextL0
, zb2thisobj
;
3183 ASSERT(zb1
->zb_objset
== zb2
->zb_objset
);
3184 ASSERT(zb2
->zb_level
== 0);
3187 * A bookmark in the deadlist is considered to be after
3190 if (zb2
->zb_object
== DMU_DEADLIST_OBJECT
)
3193 /* The objset_phys_t isn't before anything. */
3197 zb1nextL0
= (zb1
->zb_blkid
+ 1) <<
3198 ((zb1
->zb_level
) * (dnp
->dn_indblkshift
- SPA_BLKPTRSHIFT
));
3200 zb2thisobj
= zb2
->zb_object
? zb2
->zb_object
:
3201 zb2
->zb_blkid
<< (DNODE_BLOCK_SHIFT
- DNODE_SHIFT
);
3203 if (zb1
->zb_object
== DMU_META_DNODE_OBJECT
) {
3204 uint64_t nextobj
= zb1nextL0
*
3205 (dnp
->dn_datablkszsec
<< SPA_MINBLOCKSHIFT
) >> DNODE_SHIFT
;
3206 return (nextobj
<= zb2thisobj
);
3209 if (zb1
->zb_object
< zb2thisobj
)
3211 if (zb1
->zb_object
> zb2thisobj
)
3213 if (zb2
->zb_object
== DMU_META_DNODE_OBJECT
)
3215 return (zb1nextL0
<= zb2
->zb_blkid
);
3218 #if defined(_KERNEL) && defined(HAVE_SPL)
3219 /* Fault injection */
3220 EXPORT_SYMBOL(zio_injection_enabled
);
3221 EXPORT_SYMBOL(zio_inject_fault
);
3222 EXPORT_SYMBOL(zio_inject_list_next
);
3223 EXPORT_SYMBOL(zio_clear_fault
);
3224 EXPORT_SYMBOL(zio_handle_fault_injection
);
3225 EXPORT_SYMBOL(zio_handle_device_injection
);
3226 EXPORT_SYMBOL(zio_handle_label_injection
);
3227 EXPORT_SYMBOL(zio_priority_table
);
3228 EXPORT_SYMBOL(zio_type_name
);
3230 module_param(zio_bulk_flags
, int, 0644);
3231 MODULE_PARM_DESC(zio_bulk_flags
, "Additional flags to pass to bulk buffers");
3233 module_param(zio_delay_max
, int, 0644);
3234 MODULE_PARM_DESC(zio_delay_max
, "Max zio millisec delay before posting event");
3236 module_param(zio_requeue_io_start_cut_in_line
, int, 0644);
3237 MODULE_PARM_DESC(zio_requeue_io_start_cut_in_line
, "Prioritize requeued I/O");
3239 module_param(zfs_sync_pass_deferred_free
, int, 0644);
3240 MODULE_PARM_DESC(zfs_sync_pass_deferred_free
,
3241 "defer frees starting in this pass");
3243 module_param(zfs_sync_pass_dont_compress
, int, 0644);
3244 MODULE_PARM_DESC(zfs_sync_pass_dont_compress
,
3245 "don't compress starting in this pass");
3247 module_param(zfs_sync_pass_rewrite
, int, 0644);
3248 MODULE_PARM_DESC(zfs_sync_pass_rewrite
,
3249 "rewrite new bps starting in this pass");