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
;
83 extern vmem_t
*zio_alloc_arena
;
85 extern int zfs_mg_alloc_failures
;
88 * The following actions directly effect the spa's sync-to-convergence logic.
89 * The values below define the sync pass when we start performing the action.
90 * Care should be taken when changing these values as they directly impact
91 * spa_sync() performance. Tuning these values may introduce subtle performance
92 * pathologies and should only be done in the context of performance analysis.
93 * These tunables will eventually be removed and replaced with #defines once
94 * enough analysis has been done to determine optimal values.
96 * The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that
97 * regular blocks are not deferred.
99 int zfs_sync_pass_deferred_free
= 2; /* defer frees starting in this pass */
100 int zfs_sync_pass_dont_compress
= 5; /* don't compress starting in this pass */
101 int zfs_sync_pass_rewrite
= 2; /* rewrite new bps starting in this pass */
104 * An allocating zio is one that either currently has the DVA allocate
105 * stage set or will have it later in its lifetime.
107 #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE)
109 int zio_requeue_io_start_cut_in_line
= 1;
112 int zio_buf_debug_limit
= 16384;
114 int zio_buf_debug_limit
= 0;
117 static inline void __zio_execute(zio_t
*zio
);
120 zio_cons(void *arg
, void *unused
, int kmflag
)
124 bzero(zio
, sizeof (zio_t
));
126 mutex_init(&zio
->io_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
127 cv_init(&zio
->io_cv
, NULL
, CV_DEFAULT
, NULL
);
129 list_create(&zio
->io_parent_list
, sizeof (zio_link_t
),
130 offsetof(zio_link_t
, zl_parent_node
));
131 list_create(&zio
->io_child_list
, sizeof (zio_link_t
),
132 offsetof(zio_link_t
, zl_child_node
));
138 zio_dest(void *arg
, void *unused
)
142 mutex_destroy(&zio
->io_lock
);
143 cv_destroy(&zio
->io_cv
);
144 list_destroy(&zio
->io_parent_list
);
145 list_destroy(&zio
->io_child_list
);
152 vmem_t
*data_alloc_arena
= NULL
;
155 data_alloc_arena
= zio_alloc_arena
;
157 zio_cache
= kmem_cache_create("zio_cache", sizeof (zio_t
), 0,
158 zio_cons
, zio_dest
, NULL
, NULL
, NULL
, KMC_KMEM
);
159 zio_link_cache
= kmem_cache_create("zio_link_cache",
160 sizeof (zio_link_t
), 0, NULL
, NULL
, NULL
, NULL
, NULL
, KMC_KMEM
);
161 zio_vdev_cache
= kmem_cache_create("zio_vdev_cache", sizeof(vdev_io_t
),
162 PAGESIZE
, NULL
, NULL
, NULL
, NULL
, NULL
, KMC_VMEM
);
165 * For small buffers, we want a cache for each multiple of
166 * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache
167 * for each quarter-power of 2. For large buffers, we want
168 * a cache for each multiple of PAGESIZE.
170 for (c
= 0; c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
; c
++) {
171 size_t size
= (c
+ 1) << SPA_MINBLOCKSHIFT
;
175 while (p2
& (p2
- 1))
178 if (size
<= 4 * SPA_MINBLOCKSIZE
) {
179 align
= SPA_MINBLOCKSIZE
;
180 } else if (P2PHASE(size
, PAGESIZE
) == 0) {
182 } else if (P2PHASE(size
, p2
>> 2) == 0) {
188 int flags
= zio_bulk_flags
;
191 * The smallest buffers (512b) are heavily used and
192 * experience a lot of churn. The slabs allocated
193 * for them are also relatively small (32K). Thus
194 * in over to avoid expensive calls to vmalloc() we
195 * make an exception to the usual slab allocation
196 * policy and force these buffers to be kmem backed.
198 if (size
== (1 << SPA_MINBLOCKSHIFT
))
201 (void) sprintf(name
, "zio_buf_%lu", (ulong_t
)size
);
202 zio_buf_cache
[c
] = kmem_cache_create(name
, size
,
203 align
, NULL
, NULL
, NULL
, NULL
, NULL
, flags
);
205 (void) sprintf(name
, "zio_data_buf_%lu", (ulong_t
)size
);
206 zio_data_buf_cache
[c
] = kmem_cache_create(name
, size
,
207 align
, NULL
, NULL
, NULL
, NULL
,
208 data_alloc_arena
, flags
);
213 ASSERT(zio_buf_cache
[c
] != NULL
);
214 if (zio_buf_cache
[c
- 1] == NULL
)
215 zio_buf_cache
[c
- 1] = zio_buf_cache
[c
];
217 ASSERT(zio_data_buf_cache
[c
] != NULL
);
218 if (zio_data_buf_cache
[c
- 1] == NULL
)
219 zio_data_buf_cache
[c
- 1] = zio_data_buf_cache
[c
];
223 * The zio write taskqs have 1 thread per cpu, allow 1/2 of the taskqs
224 * to fail 3 times per txg or 8 failures, whichever is greater.
226 zfs_mg_alloc_failures
= MAX((3 * max_ncpus
/ 2), 8);
237 kmem_cache_t
*last_cache
= NULL
;
238 kmem_cache_t
*last_data_cache
= NULL
;
240 for (c
= 0; c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
; c
++) {
241 if (zio_buf_cache
[c
] != last_cache
) {
242 last_cache
= zio_buf_cache
[c
];
243 kmem_cache_destroy(zio_buf_cache
[c
]);
245 zio_buf_cache
[c
] = NULL
;
247 if (zio_data_buf_cache
[c
] != last_data_cache
) {
248 last_data_cache
= zio_data_buf_cache
[c
];
249 kmem_cache_destroy(zio_data_buf_cache
[c
]);
251 zio_data_buf_cache
[c
] = NULL
;
254 kmem_cache_destroy(zio_vdev_cache
);
255 kmem_cache_destroy(zio_link_cache
);
256 kmem_cache_destroy(zio_cache
);
264 * ==========================================================================
265 * Allocate and free I/O buffers
266 * ==========================================================================
270 * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a
271 * crashdump if the kernel panics, so use it judiciously. Obviously, it's
272 * useful to inspect ZFS metadata, but if possible, we should avoid keeping
273 * excess / transient data in-core during a crashdump.
276 zio_buf_alloc(size_t size
)
278 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
280 ASSERT(c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
282 return (kmem_cache_alloc(zio_buf_cache
[c
], KM_PUSHPAGE
| KM_NODEBUG
));
286 * Use zio_data_buf_alloc to allocate data. The data will not appear in a
287 * crashdump if the kernel panics. This exists so that we will limit the amount
288 * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount
289 * of kernel heap dumped to disk when the kernel panics)
292 zio_data_buf_alloc(size_t size
)
294 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
296 ASSERT(c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
298 return (kmem_cache_alloc(zio_data_buf_cache
[c
],
299 KM_PUSHPAGE
| KM_NODEBUG
));
303 zio_buf_free(void *buf
, size_t size
)
305 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
307 ASSERT(c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
309 kmem_cache_free(zio_buf_cache
[c
], buf
);
313 zio_data_buf_free(void *buf
, size_t size
)
315 size_t c
= (size
- 1) >> SPA_MINBLOCKSHIFT
;
317 ASSERT(c
< SPA_MAXBLOCKSIZE
>> SPA_MINBLOCKSHIFT
);
319 kmem_cache_free(zio_data_buf_cache
[c
], buf
);
323 * Dedicated I/O buffers to ensure that memory fragmentation never prevents
324 * or significantly delays the issuing of a zio. These buffers are used
325 * to aggregate I/O and could be used for raidz stripes.
330 return (kmem_cache_alloc(zio_vdev_cache
, KM_PUSHPAGE
));
334 zio_vdev_free(void *buf
)
336 kmem_cache_free(zio_vdev_cache
, buf
);
341 * ==========================================================================
342 * Push and pop I/O transform buffers
343 * ==========================================================================
346 zio_push_transform(zio_t
*zio
, void *data
, uint64_t size
, uint64_t bufsize
,
347 zio_transform_func_t
*transform
)
349 zio_transform_t
*zt
= kmem_alloc(sizeof (zio_transform_t
), KM_PUSHPAGE
);
351 zt
->zt_orig_data
= zio
->io_data
;
352 zt
->zt_orig_size
= zio
->io_size
;
353 zt
->zt_bufsize
= bufsize
;
354 zt
->zt_transform
= transform
;
356 zt
->zt_next
= zio
->io_transform_stack
;
357 zio
->io_transform_stack
= zt
;
364 zio_pop_transforms(zio_t
*zio
)
368 while ((zt
= zio
->io_transform_stack
) != NULL
) {
369 if (zt
->zt_transform
!= NULL
)
370 zt
->zt_transform(zio
,
371 zt
->zt_orig_data
, zt
->zt_orig_size
);
373 if (zt
->zt_bufsize
!= 0)
374 zio_buf_free(zio
->io_data
, zt
->zt_bufsize
);
376 zio
->io_data
= zt
->zt_orig_data
;
377 zio
->io_size
= zt
->zt_orig_size
;
378 zio
->io_transform_stack
= zt
->zt_next
;
380 kmem_free(zt
, sizeof (zio_transform_t
));
385 * ==========================================================================
386 * I/O transform callbacks for subblocks and decompression
387 * ==========================================================================
390 zio_subblock(zio_t
*zio
, void *data
, uint64_t size
)
392 ASSERT(zio
->io_size
> size
);
394 if (zio
->io_type
== ZIO_TYPE_READ
)
395 bcopy(zio
->io_data
, data
, size
);
399 zio_decompress(zio_t
*zio
, void *data
, uint64_t size
)
401 if (zio
->io_error
== 0 &&
402 zio_decompress_data(BP_GET_COMPRESS(zio
->io_bp
),
403 zio
->io_data
, data
, zio
->io_size
, size
) != 0)
408 * ==========================================================================
409 * I/O parent/child relationships and pipeline interlocks
410 * ==========================================================================
413 * NOTE - Callers to zio_walk_parents() and zio_walk_children must
414 * continue calling these functions until they return NULL.
415 * Otherwise, the next caller will pick up the list walk in
416 * some indeterminate state. (Otherwise every caller would
417 * have to pass in a cookie to keep the state represented by
418 * io_walk_link, which gets annoying.)
421 zio_walk_parents(zio_t
*cio
)
423 zio_link_t
*zl
= cio
->io_walk_link
;
424 list_t
*pl
= &cio
->io_parent_list
;
426 zl
= (zl
== NULL
) ? list_head(pl
) : list_next(pl
, zl
);
427 cio
->io_walk_link
= zl
;
432 ASSERT(zl
->zl_child
== cio
);
433 return (zl
->zl_parent
);
437 zio_walk_children(zio_t
*pio
)
439 zio_link_t
*zl
= pio
->io_walk_link
;
440 list_t
*cl
= &pio
->io_child_list
;
442 zl
= (zl
== NULL
) ? list_head(cl
) : list_next(cl
, zl
);
443 pio
->io_walk_link
= zl
;
448 ASSERT(zl
->zl_parent
== pio
);
449 return (zl
->zl_child
);
453 zio_unique_parent(zio_t
*cio
)
455 zio_t
*pio
= zio_walk_parents(cio
);
457 VERIFY(zio_walk_parents(cio
) == NULL
);
462 zio_add_child(zio_t
*pio
, zio_t
*cio
)
464 zio_link_t
*zl
= kmem_cache_alloc(zio_link_cache
, KM_PUSHPAGE
);
468 * Logical I/Os can have logical, gang, or vdev children.
469 * Gang I/Os can have gang or vdev children.
470 * Vdev I/Os can only have vdev children.
471 * The following ASSERT captures all of these constraints.
473 ASSERT(cio
->io_child_type
<= pio
->io_child_type
);
478 mutex_enter(&cio
->io_lock
);
479 mutex_enter(&pio
->io_lock
);
481 ASSERT(pio
->io_state
[ZIO_WAIT_DONE
] == 0);
483 for (w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
484 pio
->io_children
[cio
->io_child_type
][w
] += !cio
->io_state
[w
];
486 list_insert_head(&pio
->io_child_list
, zl
);
487 list_insert_head(&cio
->io_parent_list
, zl
);
489 pio
->io_child_count
++;
490 cio
->io_parent_count
++;
492 mutex_exit(&pio
->io_lock
);
493 mutex_exit(&cio
->io_lock
);
497 zio_remove_child(zio_t
*pio
, zio_t
*cio
, zio_link_t
*zl
)
499 ASSERT(zl
->zl_parent
== pio
);
500 ASSERT(zl
->zl_child
== cio
);
502 mutex_enter(&cio
->io_lock
);
503 mutex_enter(&pio
->io_lock
);
505 list_remove(&pio
->io_child_list
, zl
);
506 list_remove(&cio
->io_parent_list
, zl
);
508 pio
->io_child_count
--;
509 cio
->io_parent_count
--;
511 mutex_exit(&pio
->io_lock
);
512 mutex_exit(&cio
->io_lock
);
514 kmem_cache_free(zio_link_cache
, zl
);
518 zio_wait_for_children(zio_t
*zio
, enum zio_child child
, enum zio_wait_type wait
)
520 uint64_t *countp
= &zio
->io_children
[child
][wait
];
521 boolean_t waiting
= B_FALSE
;
523 mutex_enter(&zio
->io_lock
);
524 ASSERT(zio
->io_stall
== NULL
);
527 zio
->io_stall
= countp
;
530 mutex_exit(&zio
->io_lock
);
535 __attribute__((always_inline
))
537 zio_notify_parent(zio_t
*pio
, zio_t
*zio
, enum zio_wait_type wait
)
539 uint64_t *countp
= &pio
->io_children
[zio
->io_child_type
][wait
];
540 int *errorp
= &pio
->io_child_error
[zio
->io_child_type
];
542 mutex_enter(&pio
->io_lock
);
543 if (zio
->io_error
&& !(zio
->io_flags
& ZIO_FLAG_DONT_PROPAGATE
))
544 *errorp
= zio_worst_error(*errorp
, zio
->io_error
);
545 pio
->io_reexecute
|= zio
->io_reexecute
;
546 ASSERT3U(*countp
, >, 0);
547 if (--*countp
== 0 && pio
->io_stall
== countp
) {
548 pio
->io_stall
= NULL
;
549 mutex_exit(&pio
->io_lock
);
552 mutex_exit(&pio
->io_lock
);
557 zio_inherit_child_errors(zio_t
*zio
, enum zio_child c
)
559 if (zio
->io_child_error
[c
] != 0 && zio
->io_error
== 0)
560 zio
->io_error
= zio
->io_child_error
[c
];
564 * ==========================================================================
565 * Create the various types of I/O (read, write, free, etc)
566 * ==========================================================================
569 zio_create(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
,
570 void *data
, uint64_t size
, zio_done_func_t
*done
, void *private,
571 zio_type_t type
, int priority
, enum zio_flag flags
,
572 vdev_t
*vd
, uint64_t offset
, const zbookmark_t
*zb
,
573 enum zio_stage stage
, enum zio_stage pipeline
)
577 ASSERT3U(size
, <=, SPA_MAXBLOCKSIZE
);
578 ASSERT(P2PHASE(size
, SPA_MINBLOCKSIZE
) == 0);
579 ASSERT(P2PHASE(offset
, SPA_MINBLOCKSIZE
) == 0);
581 ASSERT(!vd
|| spa_config_held(spa
, SCL_STATE_ALL
, RW_READER
));
582 ASSERT(!bp
|| !(flags
& ZIO_FLAG_CONFIG_WRITER
));
583 ASSERT(vd
|| stage
== ZIO_STAGE_OPEN
);
585 zio
= kmem_cache_alloc(zio_cache
, KM_PUSHPAGE
);
588 zio
->io_child_type
= ZIO_CHILD_VDEV
;
589 else if (flags
& ZIO_FLAG_GANG_CHILD
)
590 zio
->io_child_type
= ZIO_CHILD_GANG
;
591 else if (flags
& ZIO_FLAG_DDT_CHILD
)
592 zio
->io_child_type
= ZIO_CHILD_DDT
;
594 zio
->io_child_type
= ZIO_CHILD_LOGICAL
;
597 zio
->io_logical
= NULL
;
598 zio
->io_bp
= (blkptr_t
*)bp
;
599 zio
->io_bp_copy
= *bp
;
600 zio
->io_bp_orig
= *bp
;
601 if (type
!= ZIO_TYPE_WRITE
||
602 zio
->io_child_type
== ZIO_CHILD_DDT
)
603 zio
->io_bp
= &zio
->io_bp_copy
; /* so caller can free */
604 if (zio
->io_child_type
== ZIO_CHILD_LOGICAL
)
605 zio
->io_logical
= zio
;
606 if (zio
->io_child_type
> ZIO_CHILD_GANG
&& BP_IS_GANG(bp
))
607 pipeline
|= ZIO_GANG_STAGES
;
609 zio
->io_logical
= NULL
;
611 bzero(&zio
->io_bp_copy
, sizeof (blkptr_t
));
612 bzero(&zio
->io_bp_orig
, sizeof (blkptr_t
));
617 zio
->io_ready
= NULL
;
619 zio
->io_private
= private;
620 zio
->io_prev_space_delta
= 0;
622 zio
->io_priority
= priority
;
625 zio
->io_vsd_ops
= NULL
;
626 zio
->io_offset
= offset
;
627 zio
->io_deadline
= 0;
628 zio
->io_timestamp
= 0;
631 zio
->io_orig_data
= zio
->io_data
= data
;
632 zio
->io_orig_size
= zio
->io_size
= size
;
633 zio
->io_orig_flags
= zio
->io_flags
= flags
;
634 zio
->io_orig_stage
= zio
->io_stage
= stage
;
635 zio
->io_orig_pipeline
= zio
->io_pipeline
= pipeline
;
636 bzero(&zio
->io_prop
, sizeof (zio_prop_t
));
638 zio
->io_reexecute
= 0;
639 zio
->io_bp_override
= NULL
;
640 zio
->io_walk_link
= NULL
;
641 zio
->io_transform_stack
= NULL
;
643 zio
->io_child_count
= 0;
644 zio
->io_parent_count
= 0;
645 zio
->io_stall
= NULL
;
646 zio
->io_gang_leader
= NULL
;
647 zio
->io_gang_tree
= NULL
;
648 zio
->io_executor
= NULL
;
649 zio
->io_waiter
= NULL
;
650 zio
->io_cksum_report
= NULL
;
652 bzero(zio
->io_child_error
, sizeof (int) * ZIO_CHILD_TYPES
);
653 bzero(zio
->io_children
,
654 sizeof (uint64_t) * ZIO_CHILD_TYPES
* ZIO_WAIT_TYPES
);
655 bzero(&zio
->io_bookmark
, sizeof (zbookmark_t
));
657 zio
->io_state
[ZIO_WAIT_READY
] = (stage
>= ZIO_STAGE_READY
);
658 zio
->io_state
[ZIO_WAIT_DONE
] = (stage
>= ZIO_STAGE_DONE
);
661 zio
->io_bookmark
= *zb
;
664 if (zio
->io_logical
== NULL
)
665 zio
->io_logical
= pio
->io_logical
;
666 if (zio
->io_child_type
== ZIO_CHILD_GANG
)
667 zio
->io_gang_leader
= pio
->io_gang_leader
;
668 zio_add_child(pio
, zio
);
671 taskq_init_ent(&zio
->io_tqent
);
677 zio_destroy(zio_t
*zio
)
679 kmem_cache_free(zio_cache
, zio
);
683 zio_null(zio_t
*pio
, spa_t
*spa
, vdev_t
*vd
, zio_done_func_t
*done
,
684 void *private, enum zio_flag flags
)
688 zio
= zio_create(pio
, spa
, 0, NULL
, NULL
, 0, done
, private,
689 ZIO_TYPE_NULL
, ZIO_PRIORITY_NOW
, flags
, vd
, 0, NULL
,
690 ZIO_STAGE_OPEN
, ZIO_INTERLOCK_PIPELINE
);
696 zio_root(spa_t
*spa
, zio_done_func_t
*done
, void *private, enum zio_flag flags
)
698 return (zio_null(NULL
, spa
, NULL
, done
, private, flags
));
702 zio_read(zio_t
*pio
, spa_t
*spa
, const blkptr_t
*bp
,
703 void *data
, uint64_t size
, zio_done_func_t
*done
, void *private,
704 int priority
, enum zio_flag flags
, const zbookmark_t
*zb
)
708 zio
= zio_create(pio
, spa
, BP_PHYSICAL_BIRTH(bp
), bp
,
709 data
, size
, done
, private,
710 ZIO_TYPE_READ
, priority
, flags
, NULL
, 0, zb
,
711 ZIO_STAGE_OPEN
, (flags
& ZIO_FLAG_DDT_CHILD
) ?
712 ZIO_DDT_CHILD_READ_PIPELINE
: ZIO_READ_PIPELINE
);
718 zio_write(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, blkptr_t
*bp
,
719 void *data
, uint64_t size
, const zio_prop_t
*zp
,
720 zio_done_func_t
*ready
, zio_done_func_t
*done
, void *private,
721 int priority
, enum zio_flag flags
, const zbookmark_t
*zb
)
725 ASSERT(zp
->zp_checksum
>= ZIO_CHECKSUM_OFF
&&
726 zp
->zp_checksum
< ZIO_CHECKSUM_FUNCTIONS
&&
727 zp
->zp_compress
>= ZIO_COMPRESS_OFF
&&
728 zp
->zp_compress
< ZIO_COMPRESS_FUNCTIONS
&&
729 DMU_OT_IS_VALID(zp
->zp_type
) &&
732 zp
->zp_copies
<= spa_max_replication(spa
) &&
734 zp
->zp_dedup_verify
<= 1);
736 zio
= zio_create(pio
, spa
, txg
, bp
, data
, size
, done
, private,
737 ZIO_TYPE_WRITE
, priority
, flags
, NULL
, 0, zb
,
738 ZIO_STAGE_OPEN
, (flags
& ZIO_FLAG_DDT_CHILD
) ?
739 ZIO_DDT_CHILD_WRITE_PIPELINE
: ZIO_WRITE_PIPELINE
);
741 zio
->io_ready
= ready
;
748 zio_rewrite(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, blkptr_t
*bp
, void *data
,
749 uint64_t size
, zio_done_func_t
*done
, void *private, int priority
,
750 enum zio_flag flags
, zbookmark_t
*zb
)
754 zio
= zio_create(pio
, spa
, txg
, bp
, data
, size
, done
, private,
755 ZIO_TYPE_WRITE
, priority
, flags
, NULL
, 0, zb
,
756 ZIO_STAGE_OPEN
, ZIO_REWRITE_PIPELINE
);
762 zio_write_override(zio_t
*zio
, blkptr_t
*bp
, int copies
)
764 ASSERT(zio
->io_type
== ZIO_TYPE_WRITE
);
765 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
766 ASSERT(zio
->io_stage
== ZIO_STAGE_OPEN
);
767 ASSERT(zio
->io_txg
== spa_syncing_txg(zio
->io_spa
));
769 zio
->io_prop
.zp_copies
= copies
;
770 zio
->io_bp_override
= bp
;
774 zio_free(spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
)
776 bplist_append(&spa
->spa_free_bplist
[txg
& TXG_MASK
], bp
);
780 zio_free_sync(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
,
785 dprintf_bp(bp
, "freeing in txg %llu, pass %u",
786 (longlong_t
)txg
, spa
->spa_sync_pass
);
788 ASSERT(!BP_IS_HOLE(bp
));
789 ASSERT(spa_syncing_txg(spa
) == txg
);
790 ASSERT(spa_sync_pass(spa
) < zfs_sync_pass_deferred_free
);
794 zio
= zio_create(pio
, spa
, txg
, bp
, NULL
, BP_GET_PSIZE(bp
),
795 NULL
, NULL
, ZIO_TYPE_FREE
, ZIO_PRIORITY_FREE
, flags
,
796 NULL
, 0, NULL
, ZIO_STAGE_OPEN
, ZIO_FREE_PIPELINE
);
802 zio_claim(zio_t
*pio
, spa_t
*spa
, uint64_t txg
, const blkptr_t
*bp
,
803 zio_done_func_t
*done
, void *private, enum zio_flag flags
)
808 * A claim is an allocation of a specific block. Claims are needed
809 * to support immediate writes in the intent log. The issue is that
810 * immediate writes contain committed data, but in a txg that was
811 * *not* committed. Upon opening the pool after an unclean shutdown,
812 * the intent log claims all blocks that contain immediate write data
813 * so that the SPA knows they're in use.
815 * All claims *must* be resolved in the first txg -- before the SPA
816 * starts allocating blocks -- so that nothing is allocated twice.
817 * If txg == 0 we just verify that the block is claimable.
819 ASSERT3U(spa
->spa_uberblock
.ub_rootbp
.blk_birth
, <, spa_first_txg(spa
));
820 ASSERT(txg
== spa_first_txg(spa
) || txg
== 0);
821 ASSERT(!BP_GET_DEDUP(bp
) || !spa_writeable(spa
)); /* zdb(1M) */
823 zio
= zio_create(pio
, spa
, txg
, bp
, NULL
, BP_GET_PSIZE(bp
),
824 done
, private, ZIO_TYPE_CLAIM
, ZIO_PRIORITY_NOW
, flags
,
825 NULL
, 0, NULL
, ZIO_STAGE_OPEN
, ZIO_CLAIM_PIPELINE
);
831 zio_ioctl(zio_t
*pio
, spa_t
*spa
, vdev_t
*vd
, int cmd
,
832 zio_done_func_t
*done
, void *private, int priority
, enum zio_flag flags
)
837 if (vd
->vdev_children
== 0) {
838 zio
= zio_create(pio
, spa
, 0, NULL
, NULL
, 0, done
, private,
839 ZIO_TYPE_IOCTL
, priority
, flags
, vd
, 0, NULL
,
840 ZIO_STAGE_OPEN
, ZIO_IOCTL_PIPELINE
);
844 zio
= zio_null(pio
, spa
, NULL
, NULL
, NULL
, flags
);
846 for (c
= 0; c
< vd
->vdev_children
; c
++)
847 zio_nowait(zio_ioctl(zio
, spa
, vd
->vdev_child
[c
], cmd
,
848 done
, private, priority
, flags
));
855 zio_read_phys(zio_t
*pio
, vdev_t
*vd
, uint64_t offset
, uint64_t size
,
856 void *data
, int checksum
, zio_done_func_t
*done
, void *private,
857 int priority
, enum zio_flag flags
, boolean_t labels
)
861 ASSERT(vd
->vdev_children
== 0);
862 ASSERT(!labels
|| offset
+ size
<= VDEV_LABEL_START_SIZE
||
863 offset
>= vd
->vdev_psize
- VDEV_LABEL_END_SIZE
);
864 ASSERT3U(offset
+ size
, <=, vd
->vdev_psize
);
866 zio
= zio_create(pio
, vd
->vdev_spa
, 0, NULL
, data
, size
, done
, private,
867 ZIO_TYPE_READ
, priority
, flags
, vd
, offset
, NULL
,
868 ZIO_STAGE_OPEN
, ZIO_READ_PHYS_PIPELINE
);
870 zio
->io_prop
.zp_checksum
= checksum
;
876 zio_write_phys(zio_t
*pio
, vdev_t
*vd
, uint64_t offset
, uint64_t size
,
877 void *data
, int checksum
, zio_done_func_t
*done
, void *private,
878 int priority
, enum zio_flag flags
, boolean_t labels
)
882 ASSERT(vd
->vdev_children
== 0);
883 ASSERT(!labels
|| offset
+ size
<= VDEV_LABEL_START_SIZE
||
884 offset
>= vd
->vdev_psize
- VDEV_LABEL_END_SIZE
);
885 ASSERT3U(offset
+ size
, <=, vd
->vdev_psize
);
887 zio
= zio_create(pio
, vd
->vdev_spa
, 0, NULL
, data
, size
, done
, private,
888 ZIO_TYPE_WRITE
, priority
, flags
, vd
, offset
, NULL
,
889 ZIO_STAGE_OPEN
, ZIO_WRITE_PHYS_PIPELINE
);
891 zio
->io_prop
.zp_checksum
= checksum
;
893 if (zio_checksum_table
[checksum
].ci_eck
) {
895 * zec checksums are necessarily destructive -- they modify
896 * the end of the write buffer to hold the verifier/checksum.
897 * Therefore, we must make a local copy in case the data is
898 * being written to multiple places in parallel.
900 void *wbuf
= zio_buf_alloc(size
);
901 bcopy(data
, wbuf
, size
);
902 zio_push_transform(zio
, wbuf
, size
, size
, NULL
);
909 * Create a child I/O to do some work for us.
912 zio_vdev_child_io(zio_t
*pio
, blkptr_t
*bp
, vdev_t
*vd
, uint64_t offset
,
913 void *data
, uint64_t size
, int type
, int priority
, enum zio_flag flags
,
914 zio_done_func_t
*done
, void *private)
916 enum zio_stage pipeline
= ZIO_VDEV_CHILD_PIPELINE
;
919 ASSERT(vd
->vdev_parent
==
920 (pio
->io_vd
? pio
->io_vd
: pio
->io_spa
->spa_root_vdev
));
922 if (type
== ZIO_TYPE_READ
&& bp
!= NULL
) {
924 * If we have the bp, then the child should perform the
925 * checksum and the parent need not. This pushes error
926 * detection as close to the leaves as possible and
927 * eliminates redundant checksums in the interior nodes.
929 pipeline
|= ZIO_STAGE_CHECKSUM_VERIFY
;
930 pio
->io_pipeline
&= ~ZIO_STAGE_CHECKSUM_VERIFY
;
933 if (vd
->vdev_children
== 0)
934 offset
+= VDEV_LABEL_START_SIZE
;
936 flags
|= ZIO_VDEV_CHILD_FLAGS(pio
) | ZIO_FLAG_DONT_PROPAGATE
;
939 * If we've decided to do a repair, the write is not speculative --
940 * even if the original read was.
942 if (flags
& ZIO_FLAG_IO_REPAIR
)
943 flags
&= ~ZIO_FLAG_SPECULATIVE
;
945 zio
= zio_create(pio
, pio
->io_spa
, pio
->io_txg
, bp
, data
, size
,
946 done
, private, type
, priority
, flags
, vd
, offset
, &pio
->io_bookmark
,
947 ZIO_STAGE_VDEV_IO_START
>> 1, pipeline
);
953 zio_vdev_delegated_io(vdev_t
*vd
, uint64_t offset
, void *data
, uint64_t size
,
954 int type
, int priority
, enum zio_flag flags
,
955 zio_done_func_t
*done
, void *private)
959 ASSERT(vd
->vdev_ops
->vdev_op_leaf
);
961 zio
= zio_create(NULL
, vd
->vdev_spa
, 0, NULL
,
962 data
, size
, done
, private, type
, priority
,
963 flags
| ZIO_FLAG_CANFAIL
| ZIO_FLAG_DONT_RETRY
,
965 ZIO_STAGE_VDEV_IO_START
>> 1, ZIO_VDEV_CHILD_PIPELINE
);
971 zio_flush(zio_t
*zio
, vdev_t
*vd
)
973 zio_nowait(zio_ioctl(zio
, zio
->io_spa
, vd
, DKIOCFLUSHWRITECACHE
,
974 NULL
, NULL
, ZIO_PRIORITY_NOW
,
975 ZIO_FLAG_CANFAIL
| ZIO_FLAG_DONT_PROPAGATE
| ZIO_FLAG_DONT_RETRY
));
979 zio_shrink(zio_t
*zio
, uint64_t size
)
981 ASSERT(zio
->io_executor
== NULL
);
982 ASSERT(zio
->io_orig_size
== zio
->io_size
);
983 ASSERT(size
<= zio
->io_size
);
986 * We don't shrink for raidz because of problems with the
987 * reconstruction when reading back less than the block size.
988 * Note, BP_IS_RAIDZ() assumes no compression.
990 ASSERT(BP_GET_COMPRESS(zio
->io_bp
) == ZIO_COMPRESS_OFF
);
991 if (!BP_IS_RAIDZ(zio
->io_bp
))
992 zio
->io_orig_size
= zio
->io_size
= size
;
996 * ==========================================================================
997 * Prepare to read and write logical blocks
998 * ==========================================================================
1002 zio_read_bp_init(zio_t
*zio
)
1004 blkptr_t
*bp
= zio
->io_bp
;
1006 if (BP_GET_COMPRESS(bp
) != ZIO_COMPRESS_OFF
&&
1007 zio
->io_child_type
== ZIO_CHILD_LOGICAL
&&
1008 !(zio
->io_flags
& ZIO_FLAG_RAW
)) {
1009 uint64_t psize
= BP_GET_PSIZE(bp
);
1010 void *cbuf
= zio_buf_alloc(psize
);
1012 zio_push_transform(zio
, cbuf
, psize
, psize
, zio_decompress
);
1015 if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp
)) && BP_GET_LEVEL(bp
) == 0)
1016 zio
->io_flags
|= ZIO_FLAG_DONT_CACHE
;
1018 if (BP_GET_TYPE(bp
) == DMU_OT_DDT_ZAP
)
1019 zio
->io_flags
|= ZIO_FLAG_DONT_CACHE
;
1021 if (BP_GET_DEDUP(bp
) && zio
->io_child_type
== ZIO_CHILD_LOGICAL
)
1022 zio
->io_pipeline
= ZIO_DDT_READ_PIPELINE
;
1024 return (ZIO_PIPELINE_CONTINUE
);
1028 zio_write_bp_init(zio_t
*zio
)
1030 spa_t
*spa
= zio
->io_spa
;
1031 zio_prop_t
*zp
= &zio
->io_prop
;
1032 enum zio_compress compress
= zp
->zp_compress
;
1033 blkptr_t
*bp
= zio
->io_bp
;
1034 uint64_t lsize
= zio
->io_size
;
1035 uint64_t psize
= lsize
;
1039 * If our children haven't all reached the ready stage,
1040 * wait for them and then repeat this pipeline stage.
1042 if (zio_wait_for_children(zio
, ZIO_CHILD_GANG
, ZIO_WAIT_READY
) ||
1043 zio_wait_for_children(zio
, ZIO_CHILD_LOGICAL
, ZIO_WAIT_READY
))
1044 return (ZIO_PIPELINE_STOP
);
1046 if (!IO_IS_ALLOCATING(zio
))
1047 return (ZIO_PIPELINE_CONTINUE
);
1049 ASSERT(zio
->io_child_type
!= ZIO_CHILD_DDT
);
1051 if (zio
->io_bp_override
) {
1052 ASSERT(bp
->blk_birth
!= zio
->io_txg
);
1053 ASSERT(BP_GET_DEDUP(zio
->io_bp_override
) == 0);
1055 *bp
= *zio
->io_bp_override
;
1056 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1058 if (BP_IS_HOLE(bp
) || !zp
->zp_dedup
)
1059 return (ZIO_PIPELINE_CONTINUE
);
1061 ASSERT(zio_checksum_table
[zp
->zp_checksum
].ci_dedup
||
1062 zp
->zp_dedup_verify
);
1064 if (BP_GET_CHECKSUM(bp
) == zp
->zp_checksum
) {
1065 BP_SET_DEDUP(bp
, 1);
1066 zio
->io_pipeline
|= ZIO_STAGE_DDT_WRITE
;
1067 return (ZIO_PIPELINE_CONTINUE
);
1069 zio
->io_bp_override
= NULL
;
1073 if (bp
->blk_birth
== zio
->io_txg
) {
1075 * We're rewriting an existing block, which means we're
1076 * working on behalf of spa_sync(). For spa_sync() to
1077 * converge, it must eventually be the case that we don't
1078 * have to allocate new blocks. But compression changes
1079 * the blocksize, which forces a reallocate, and makes
1080 * convergence take longer. Therefore, after the first
1081 * few passes, stop compressing to ensure convergence.
1083 pass
= spa_sync_pass(spa
);
1085 ASSERT(zio
->io_txg
== spa_syncing_txg(spa
));
1086 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1087 ASSERT(!BP_GET_DEDUP(bp
));
1089 if (pass
>= zfs_sync_pass_dont_compress
)
1090 compress
= ZIO_COMPRESS_OFF
;
1092 /* Make sure someone doesn't change their mind on overwrites */
1093 ASSERT(MIN(zp
->zp_copies
+ BP_IS_GANG(bp
),
1094 spa_max_replication(spa
)) == BP_GET_NDVAS(bp
));
1097 if (compress
!= ZIO_COMPRESS_OFF
) {
1098 void *cbuf
= zio_buf_alloc(lsize
);
1099 psize
= zio_compress_data(compress
, zio
->io_data
, cbuf
, lsize
);
1100 if (psize
== 0 || psize
== lsize
) {
1101 compress
= ZIO_COMPRESS_OFF
;
1102 zio_buf_free(cbuf
, lsize
);
1104 ASSERT(psize
< lsize
);
1105 zio_push_transform(zio
, cbuf
, psize
, lsize
, NULL
);
1110 * The final pass of spa_sync() must be all rewrites, but the first
1111 * few passes offer a trade-off: allocating blocks defers convergence,
1112 * but newly allocated blocks are sequential, so they can be written
1113 * to disk faster. Therefore, we allow the first few passes of
1114 * spa_sync() to allocate new blocks, but force rewrites after that.
1115 * There should only be a handful of blocks after pass 1 in any case.
1117 if (bp
->blk_birth
== zio
->io_txg
&& BP_GET_PSIZE(bp
) == psize
&&
1118 pass
>= zfs_sync_pass_rewrite
) {
1119 enum zio_stage gang_stages
= zio
->io_pipeline
& ZIO_GANG_STAGES
;
1121 zio
->io_pipeline
= ZIO_REWRITE_PIPELINE
| gang_stages
;
1122 zio
->io_flags
|= ZIO_FLAG_IO_REWRITE
;
1125 zio
->io_pipeline
= ZIO_WRITE_PIPELINE
;
1129 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1131 ASSERT(zp
->zp_checksum
!= ZIO_CHECKSUM_GANG_HEADER
);
1132 BP_SET_LSIZE(bp
, lsize
);
1133 BP_SET_PSIZE(bp
, psize
);
1134 BP_SET_COMPRESS(bp
, compress
);
1135 BP_SET_CHECKSUM(bp
, zp
->zp_checksum
);
1136 BP_SET_TYPE(bp
, zp
->zp_type
);
1137 BP_SET_LEVEL(bp
, zp
->zp_level
);
1138 BP_SET_DEDUP(bp
, zp
->zp_dedup
);
1139 BP_SET_BYTEORDER(bp
, ZFS_HOST_BYTEORDER
);
1141 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1142 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_REWRITE
));
1143 zio
->io_pipeline
= ZIO_DDT_WRITE_PIPELINE
;
1147 return (ZIO_PIPELINE_CONTINUE
);
1151 zio_free_bp_init(zio_t
*zio
)
1153 blkptr_t
*bp
= zio
->io_bp
;
1155 if (zio
->io_child_type
== ZIO_CHILD_LOGICAL
) {
1156 if (BP_GET_DEDUP(bp
))
1157 zio
->io_pipeline
= ZIO_DDT_FREE_PIPELINE
;
1160 return (ZIO_PIPELINE_CONTINUE
);
1164 * ==========================================================================
1165 * Execute the I/O pipeline
1166 * ==========================================================================
1170 zio_taskq_dispatch(zio_t
*zio
, zio_taskq_type_t q
, boolean_t cutinline
)
1172 spa_t
*spa
= zio
->io_spa
;
1173 zio_type_t t
= zio
->io_type
;
1174 int flags
= (cutinline
? TQ_FRONT
: 0);
1177 * If we're a config writer or a probe, the normal issue and
1178 * interrupt threads may all be blocked waiting for the config lock.
1179 * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL.
1181 if (zio
->io_flags
& (ZIO_FLAG_CONFIG_WRITER
| ZIO_FLAG_PROBE
))
1185 * A similar issue exists for the L2ARC write thread until L2ARC 2.0.
1187 if (t
== ZIO_TYPE_WRITE
&& zio
->io_vd
&& zio
->io_vd
->vdev_aux
)
1191 * If this is a high priority I/O, then use the high priority taskq if
1194 if (zio
->io_priority
== ZIO_PRIORITY_NOW
&&
1195 spa
->spa_zio_taskq
[t
][q
+ 1].stqs_count
!= 0)
1198 ASSERT3U(q
, <, ZIO_TASKQ_TYPES
);
1201 * NB: We are assuming that the zio can only be dispatched
1202 * to a single taskq at a time. It would be a grievous error
1203 * to dispatch the zio to another taskq at the same time.
1205 ASSERT(taskq_empty_ent(&zio
->io_tqent
));
1206 spa_taskq_dispatch_ent(spa
, t
, q
, (task_func_t
*)zio_execute
, zio
,
1207 flags
, &zio
->io_tqent
);
1211 zio_taskq_member(zio_t
*zio
, zio_taskq_type_t q
)
1213 kthread_t
*executor
= zio
->io_executor
;
1214 spa_t
*spa
= zio
->io_spa
;
1217 for (t
= 0; t
< ZIO_TYPES
; t
++) {
1218 spa_taskqs_t
*tqs
= &spa
->spa_zio_taskq
[t
][q
];
1220 for (i
= 0; i
< tqs
->stqs_count
; i
++) {
1221 if (taskq_member(tqs
->stqs_taskq
[i
], executor
))
1230 zio_issue_async(zio_t
*zio
)
1232 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, B_FALSE
);
1234 return (ZIO_PIPELINE_STOP
);
1238 zio_interrupt(zio_t
*zio
)
1240 zio_taskq_dispatch(zio
, ZIO_TASKQ_INTERRUPT
, B_FALSE
);
1244 * Execute the I/O pipeline until one of the following occurs:
1245 * (1) the I/O completes; (2) the pipeline stalls waiting for
1246 * dependent child I/Os; (3) the I/O issues, so we're waiting
1247 * for an I/O completion interrupt; (4) the I/O is delegated by
1248 * vdev-level caching or aggregation; (5) the I/O is deferred
1249 * due to vdev-level queueing; (6) the I/O is handed off to
1250 * another thread. In all cases, the pipeline stops whenever
1251 * there's no CPU work; it never burns a thread in cv_wait().
1253 * There's no locking on io_stage because there's no legitimate way
1254 * for multiple threads to be attempting to process the same I/O.
1256 static zio_pipe_stage_t
*zio_pipeline
[];
1259 * zio_execute() is a wrapper around the static function
1260 * __zio_execute() so that we can force __zio_execute() to be
1261 * inlined. This reduces stack overhead which is important
1262 * because __zio_execute() is called recursively in several zio
1263 * code paths. zio_execute() itself cannot be inlined because
1264 * it is externally visible.
1267 zio_execute(zio_t
*zio
)
1272 __attribute__((always_inline
))
1274 __zio_execute(zio_t
*zio
)
1276 zio
->io_executor
= curthread
;
1278 while (zio
->io_stage
< ZIO_STAGE_DONE
) {
1279 enum zio_stage pipeline
= zio
->io_pipeline
;
1280 enum zio_stage stage
= zio
->io_stage
;
1285 ASSERT(!MUTEX_HELD(&zio
->io_lock
));
1286 ASSERT(ISP2(stage
));
1287 ASSERT(zio
->io_stall
== NULL
);
1291 } while ((stage
& pipeline
) == 0);
1293 ASSERT(stage
<= ZIO_STAGE_DONE
);
1295 dp
= spa_get_dsl(zio
->io_spa
);
1296 cut
= (stage
== ZIO_STAGE_VDEV_IO_START
) ?
1297 zio_requeue_io_start_cut_in_line
: B_FALSE
;
1300 * If we are in interrupt context and this pipeline stage
1301 * will grab a config lock that is held across I/O,
1302 * or may wait for an I/O that needs an interrupt thread
1303 * to complete, issue async to avoid deadlock.
1305 * For VDEV_IO_START, we cut in line so that the io will
1306 * be sent to disk promptly.
1308 if ((stage
& ZIO_BLOCKING_STAGES
) && zio
->io_vd
== NULL
&&
1309 zio_taskq_member(zio
, ZIO_TASKQ_INTERRUPT
)) {
1310 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, cut
);
1316 * If we executing in the context of the tx_sync_thread,
1317 * or we are performing pool initialization outside of a
1318 * zio_taskq[ZIO_TASKQ_ISSUE] context. Then issue the zio
1319 * async to minimize stack usage for these deep call paths.
1321 if ((dp
&& curthread
== dp
->dp_tx
.tx_sync_thread
) ||
1322 (dp
&& spa_is_initializing(dp
->dp_spa
) &&
1323 !zio_taskq_member(zio
, ZIO_TASKQ_ISSUE
))) {
1324 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, cut
);
1329 zio
->io_stage
= stage
;
1330 rv
= zio_pipeline
[highbit(stage
) - 1](zio
);
1332 if (rv
== ZIO_PIPELINE_STOP
)
1335 ASSERT(rv
== ZIO_PIPELINE_CONTINUE
);
1341 * ==========================================================================
1342 * Initiate I/O, either sync or async
1343 * ==========================================================================
1346 zio_wait(zio_t
*zio
)
1350 ASSERT(zio
->io_stage
== ZIO_STAGE_OPEN
);
1351 ASSERT(zio
->io_executor
== NULL
);
1353 zio
->io_waiter
= curthread
;
1357 mutex_enter(&zio
->io_lock
);
1358 while (zio
->io_executor
!= NULL
)
1359 cv_wait_io(&zio
->io_cv
, &zio
->io_lock
);
1360 mutex_exit(&zio
->io_lock
);
1362 error
= zio
->io_error
;
1369 zio_nowait(zio_t
*zio
)
1371 ASSERT(zio
->io_executor
== NULL
);
1373 if (zio
->io_child_type
== ZIO_CHILD_LOGICAL
&&
1374 zio_unique_parent(zio
) == NULL
) {
1376 * This is a logical async I/O with no parent to wait for it.
1377 * We add it to the spa_async_root_zio "Godfather" I/O which
1378 * will ensure they complete prior to unloading the pool.
1380 spa_t
*spa
= zio
->io_spa
;
1382 zio_add_child(spa
->spa_async_zio_root
, zio
);
1389 * ==========================================================================
1390 * Reexecute or suspend/resume failed I/O
1391 * ==========================================================================
1395 zio_reexecute(zio_t
*pio
)
1397 zio_t
*cio
, *cio_next
;
1400 ASSERT(pio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1401 ASSERT(pio
->io_orig_stage
== ZIO_STAGE_OPEN
);
1402 ASSERT(pio
->io_gang_leader
== NULL
);
1403 ASSERT(pio
->io_gang_tree
== NULL
);
1405 pio
->io_flags
= pio
->io_orig_flags
;
1406 pio
->io_stage
= pio
->io_orig_stage
;
1407 pio
->io_pipeline
= pio
->io_orig_pipeline
;
1408 pio
->io_reexecute
= 0;
1410 for (w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
1411 pio
->io_state
[w
] = 0;
1412 for (c
= 0; c
< ZIO_CHILD_TYPES
; c
++)
1413 pio
->io_child_error
[c
] = 0;
1415 if (IO_IS_ALLOCATING(pio
))
1416 BP_ZERO(pio
->io_bp
);
1419 * As we reexecute pio's children, new children could be created.
1420 * New children go to the head of pio's io_child_list, however,
1421 * so we will (correctly) not reexecute them. The key is that
1422 * the remainder of pio's io_child_list, from 'cio_next' onward,
1423 * cannot be affected by any side effects of reexecuting 'cio'.
1425 for (cio
= zio_walk_children(pio
); cio
!= NULL
; cio
= cio_next
) {
1426 cio_next
= zio_walk_children(pio
);
1427 mutex_enter(&pio
->io_lock
);
1428 for (w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
1429 pio
->io_children
[cio
->io_child_type
][w
]++;
1430 mutex_exit(&pio
->io_lock
);
1435 * Now that all children have been reexecuted, execute the parent.
1436 * We don't reexecute "The Godfather" I/O here as it's the
1437 * responsibility of the caller to wait on him.
1439 if (!(pio
->io_flags
& ZIO_FLAG_GODFATHER
))
1444 zio_suspend(spa_t
*spa
, zio_t
*zio
)
1446 if (spa_get_failmode(spa
) == ZIO_FAILURE_MODE_PANIC
)
1447 fm_panic("Pool '%s' has encountered an uncorrectable I/O "
1448 "failure and the failure mode property for this pool "
1449 "is set to panic.", spa_name(spa
));
1451 zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE
, spa
, NULL
, NULL
, 0, 0);
1453 mutex_enter(&spa
->spa_suspend_lock
);
1455 if (spa
->spa_suspend_zio_root
== NULL
)
1456 spa
->spa_suspend_zio_root
= zio_root(spa
, NULL
, NULL
,
1457 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
|
1458 ZIO_FLAG_GODFATHER
);
1460 spa
->spa_suspended
= B_TRUE
;
1463 ASSERT(!(zio
->io_flags
& ZIO_FLAG_GODFATHER
));
1464 ASSERT(zio
!= spa
->spa_suspend_zio_root
);
1465 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1466 ASSERT(zio_unique_parent(zio
) == NULL
);
1467 ASSERT(zio
->io_stage
== ZIO_STAGE_DONE
);
1468 zio_add_child(spa
->spa_suspend_zio_root
, zio
);
1471 mutex_exit(&spa
->spa_suspend_lock
);
1475 zio_resume(spa_t
*spa
)
1480 * Reexecute all previously suspended i/o.
1482 mutex_enter(&spa
->spa_suspend_lock
);
1483 spa
->spa_suspended
= B_FALSE
;
1484 cv_broadcast(&spa
->spa_suspend_cv
);
1485 pio
= spa
->spa_suspend_zio_root
;
1486 spa
->spa_suspend_zio_root
= NULL
;
1487 mutex_exit(&spa
->spa_suspend_lock
);
1493 return (zio_wait(pio
));
1497 zio_resume_wait(spa_t
*spa
)
1499 mutex_enter(&spa
->spa_suspend_lock
);
1500 while (spa_suspended(spa
))
1501 cv_wait(&spa
->spa_suspend_cv
, &spa
->spa_suspend_lock
);
1502 mutex_exit(&spa
->spa_suspend_lock
);
1506 * ==========================================================================
1509 * A gang block is a collection of small blocks that looks to the DMU
1510 * like one large block. When zio_dva_allocate() cannot find a block
1511 * of the requested size, due to either severe fragmentation or the pool
1512 * being nearly full, it calls zio_write_gang_block() to construct the
1513 * block from smaller fragments.
1515 * A gang block consists of a gang header (zio_gbh_phys_t) and up to
1516 * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like
1517 * an indirect block: it's an array of block pointers. It consumes
1518 * only one sector and hence is allocatable regardless of fragmentation.
1519 * The gang header's bps point to its gang members, which hold the data.
1521 * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg>
1522 * as the verifier to ensure uniqueness of the SHA256 checksum.
1523 * Critically, the gang block bp's blk_cksum is the checksum of the data,
1524 * not the gang header. This ensures that data block signatures (needed for
1525 * deduplication) are independent of how the block is physically stored.
1527 * Gang blocks can be nested: a gang member may itself be a gang block.
1528 * Thus every gang block is a tree in which root and all interior nodes are
1529 * gang headers, and the leaves are normal blocks that contain user data.
1530 * The root of the gang tree is called the gang leader.
1532 * To perform any operation (read, rewrite, free, claim) on a gang block,
1533 * zio_gang_assemble() first assembles the gang tree (minus data leaves)
1534 * in the io_gang_tree field of the original logical i/o by recursively
1535 * reading the gang leader and all gang headers below it. This yields
1536 * an in-core tree containing the contents of every gang header and the
1537 * bps for every constituent of the gang block.
1539 * With the gang tree now assembled, zio_gang_issue() just walks the gang tree
1540 * and invokes a callback on each bp. To free a gang block, zio_gang_issue()
1541 * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp.
1542 * zio_claim_gang() provides a similarly trivial wrapper for zio_claim().
1543 * zio_read_gang() is a wrapper around zio_read() that omits reading gang
1544 * headers, since we already have those in io_gang_tree. zio_rewrite_gang()
1545 * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite()
1546 * of the gang header plus zio_checksum_compute() of the data to update the
1547 * gang header's blk_cksum as described above.
1549 * The two-phase assemble/issue model solves the problem of partial failure --
1550 * what if you'd freed part of a gang block but then couldn't read the
1551 * gang header for another part? Assembling the entire gang tree first
1552 * ensures that all the necessary gang header I/O has succeeded before
1553 * starting the actual work of free, claim, or write. Once the gang tree
1554 * is assembled, free and claim are in-memory operations that cannot fail.
1556 * In the event that a gang write fails, zio_dva_unallocate() walks the
1557 * gang tree to immediately free (i.e. insert back into the space map)
1558 * everything we've allocated. This ensures that we don't get ENOSPC
1559 * errors during repeated suspend/resume cycles due to a flaky device.
1561 * Gang rewrites only happen during sync-to-convergence. If we can't assemble
1562 * the gang tree, we won't modify the block, so we can safely defer the free
1563 * (knowing that the block is still intact). If we *can* assemble the gang
1564 * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free
1565 * each constituent bp and we can allocate a new block on the next sync pass.
1567 * In all cases, the gang tree allows complete recovery from partial failure.
1568 * ==========================================================================
1572 zio_read_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, void *data
)
1577 return (zio_read(pio
, pio
->io_spa
, bp
, data
, BP_GET_PSIZE(bp
),
1578 NULL
, NULL
, pio
->io_priority
, ZIO_GANG_CHILD_FLAGS(pio
),
1579 &pio
->io_bookmark
));
1583 zio_rewrite_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, void *data
)
1588 zio
= zio_rewrite(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
1589 gn
->gn_gbh
, SPA_GANGBLOCKSIZE
, NULL
, NULL
, pio
->io_priority
,
1590 ZIO_GANG_CHILD_FLAGS(pio
), &pio
->io_bookmark
);
1592 * As we rewrite each gang header, the pipeline will compute
1593 * a new gang block header checksum for it; but no one will
1594 * compute a new data checksum, so we do that here. The one
1595 * exception is the gang leader: the pipeline already computed
1596 * its data checksum because that stage precedes gang assembly.
1597 * (Presently, nothing actually uses interior data checksums;
1598 * this is just good hygiene.)
1600 if (gn
!= pio
->io_gang_leader
->io_gang_tree
) {
1601 zio_checksum_compute(zio
, BP_GET_CHECKSUM(bp
),
1602 data
, BP_GET_PSIZE(bp
));
1605 * If we are here to damage data for testing purposes,
1606 * leave the GBH alone so that we can detect the damage.
1608 if (pio
->io_gang_leader
->io_flags
& ZIO_FLAG_INDUCE_DAMAGE
)
1609 zio
->io_pipeline
&= ~ZIO_VDEV_IO_STAGES
;
1611 zio
= zio_rewrite(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
1612 data
, BP_GET_PSIZE(bp
), NULL
, NULL
, pio
->io_priority
,
1613 ZIO_GANG_CHILD_FLAGS(pio
), &pio
->io_bookmark
);
1621 zio_free_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, void *data
)
1623 return (zio_free_sync(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
1624 ZIO_GANG_CHILD_FLAGS(pio
)));
1629 zio_claim_gang(zio_t
*pio
, blkptr_t
*bp
, zio_gang_node_t
*gn
, void *data
)
1631 return (zio_claim(pio
, pio
->io_spa
, pio
->io_txg
, bp
,
1632 NULL
, NULL
, ZIO_GANG_CHILD_FLAGS(pio
)));
1635 static zio_gang_issue_func_t
*zio_gang_issue_func
[ZIO_TYPES
] = {
1644 static void zio_gang_tree_assemble_done(zio_t
*zio
);
1646 static zio_gang_node_t
*
1647 zio_gang_node_alloc(zio_gang_node_t
**gnpp
)
1649 zio_gang_node_t
*gn
;
1651 ASSERT(*gnpp
== NULL
);
1653 gn
= kmem_zalloc(sizeof (*gn
), KM_PUSHPAGE
);
1654 gn
->gn_gbh
= zio_buf_alloc(SPA_GANGBLOCKSIZE
);
1661 zio_gang_node_free(zio_gang_node_t
**gnpp
)
1663 zio_gang_node_t
*gn
= *gnpp
;
1666 for (g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++)
1667 ASSERT(gn
->gn_child
[g
] == NULL
);
1669 zio_buf_free(gn
->gn_gbh
, SPA_GANGBLOCKSIZE
);
1670 kmem_free(gn
, sizeof (*gn
));
1675 zio_gang_tree_free(zio_gang_node_t
**gnpp
)
1677 zio_gang_node_t
*gn
= *gnpp
;
1683 for (g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++)
1684 zio_gang_tree_free(&gn
->gn_child
[g
]);
1686 zio_gang_node_free(gnpp
);
1690 zio_gang_tree_assemble(zio_t
*gio
, blkptr_t
*bp
, zio_gang_node_t
**gnpp
)
1692 zio_gang_node_t
*gn
= zio_gang_node_alloc(gnpp
);
1694 ASSERT(gio
->io_gang_leader
== gio
);
1695 ASSERT(BP_IS_GANG(bp
));
1697 zio_nowait(zio_read(gio
, gio
->io_spa
, bp
, gn
->gn_gbh
,
1698 SPA_GANGBLOCKSIZE
, zio_gang_tree_assemble_done
, gn
,
1699 gio
->io_priority
, ZIO_GANG_CHILD_FLAGS(gio
), &gio
->io_bookmark
));
1703 zio_gang_tree_assemble_done(zio_t
*zio
)
1705 zio_t
*gio
= zio
->io_gang_leader
;
1706 zio_gang_node_t
*gn
= zio
->io_private
;
1707 blkptr_t
*bp
= zio
->io_bp
;
1710 ASSERT(gio
== zio_unique_parent(zio
));
1711 ASSERT(zio
->io_child_count
== 0);
1716 if (BP_SHOULD_BYTESWAP(bp
))
1717 byteswap_uint64_array(zio
->io_data
, zio
->io_size
);
1719 ASSERT(zio
->io_data
== gn
->gn_gbh
);
1720 ASSERT(zio
->io_size
== SPA_GANGBLOCKSIZE
);
1721 ASSERT(gn
->gn_gbh
->zg_tail
.zec_magic
== ZEC_MAGIC
);
1723 for (g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++) {
1724 blkptr_t
*gbp
= &gn
->gn_gbh
->zg_blkptr
[g
];
1725 if (!BP_IS_GANG(gbp
))
1727 zio_gang_tree_assemble(gio
, gbp
, &gn
->gn_child
[g
]);
1732 zio_gang_tree_issue(zio_t
*pio
, zio_gang_node_t
*gn
, blkptr_t
*bp
, void *data
)
1734 zio_t
*gio
= pio
->io_gang_leader
;
1738 ASSERT(BP_IS_GANG(bp
) == !!gn
);
1739 ASSERT(BP_GET_CHECKSUM(bp
) == BP_GET_CHECKSUM(gio
->io_bp
));
1740 ASSERT(BP_GET_LSIZE(bp
) == BP_GET_PSIZE(bp
) || gn
== gio
->io_gang_tree
);
1743 * If you're a gang header, your data is in gn->gn_gbh.
1744 * If you're a gang member, your data is in 'data' and gn == NULL.
1746 zio
= zio_gang_issue_func
[gio
->io_type
](pio
, bp
, gn
, data
);
1749 ASSERT(gn
->gn_gbh
->zg_tail
.zec_magic
== ZEC_MAGIC
);
1751 for (g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++) {
1752 blkptr_t
*gbp
= &gn
->gn_gbh
->zg_blkptr
[g
];
1753 if (BP_IS_HOLE(gbp
))
1755 zio_gang_tree_issue(zio
, gn
->gn_child
[g
], gbp
, data
);
1756 data
= (char *)data
+ BP_GET_PSIZE(gbp
);
1760 if (gn
== gio
->io_gang_tree
)
1761 ASSERT3P((char *)gio
->io_data
+ gio
->io_size
, ==, data
);
1768 zio_gang_assemble(zio_t
*zio
)
1770 blkptr_t
*bp
= zio
->io_bp
;
1772 ASSERT(BP_IS_GANG(bp
) && zio
->io_gang_leader
== NULL
);
1773 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
1775 zio
->io_gang_leader
= zio
;
1777 zio_gang_tree_assemble(zio
, bp
, &zio
->io_gang_tree
);
1779 return (ZIO_PIPELINE_CONTINUE
);
1783 zio_gang_issue(zio_t
*zio
)
1785 blkptr_t
*bp
= zio
->io_bp
;
1787 if (zio_wait_for_children(zio
, ZIO_CHILD_GANG
, ZIO_WAIT_DONE
))
1788 return (ZIO_PIPELINE_STOP
);
1790 ASSERT(BP_IS_GANG(bp
) && zio
->io_gang_leader
== zio
);
1791 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
1793 if (zio
->io_child_error
[ZIO_CHILD_GANG
] == 0)
1794 zio_gang_tree_issue(zio
, zio
->io_gang_tree
, bp
, zio
->io_data
);
1796 zio_gang_tree_free(&zio
->io_gang_tree
);
1798 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1800 return (ZIO_PIPELINE_CONTINUE
);
1804 zio_write_gang_member_ready(zio_t
*zio
)
1806 zio_t
*pio
= zio_unique_parent(zio
);
1807 ASSERTV(zio_t
*gio
= zio
->io_gang_leader
;)
1808 dva_t
*cdva
= zio
->io_bp
->blk_dva
;
1809 dva_t
*pdva
= pio
->io_bp
->blk_dva
;
1813 if (BP_IS_HOLE(zio
->io_bp
))
1816 ASSERT(BP_IS_HOLE(&zio
->io_bp_orig
));
1818 ASSERT(zio
->io_child_type
== ZIO_CHILD_GANG
);
1819 ASSERT3U(zio
->io_prop
.zp_copies
, ==, gio
->io_prop
.zp_copies
);
1820 ASSERT3U(zio
->io_prop
.zp_copies
, <=, BP_GET_NDVAS(zio
->io_bp
));
1821 ASSERT3U(pio
->io_prop
.zp_copies
, <=, BP_GET_NDVAS(pio
->io_bp
));
1822 ASSERT3U(BP_GET_NDVAS(zio
->io_bp
), <=, BP_GET_NDVAS(pio
->io_bp
));
1824 mutex_enter(&pio
->io_lock
);
1825 for (d
= 0; d
< BP_GET_NDVAS(zio
->io_bp
); d
++) {
1826 ASSERT(DVA_GET_GANG(&pdva
[d
]));
1827 asize
= DVA_GET_ASIZE(&pdva
[d
]);
1828 asize
+= DVA_GET_ASIZE(&cdva
[d
]);
1829 DVA_SET_ASIZE(&pdva
[d
], asize
);
1831 mutex_exit(&pio
->io_lock
);
1835 zio_write_gang_block(zio_t
*pio
)
1837 spa_t
*spa
= pio
->io_spa
;
1838 blkptr_t
*bp
= pio
->io_bp
;
1839 zio_t
*gio
= pio
->io_gang_leader
;
1841 zio_gang_node_t
*gn
, **gnpp
;
1842 zio_gbh_phys_t
*gbh
;
1843 uint64_t txg
= pio
->io_txg
;
1844 uint64_t resid
= pio
->io_size
;
1846 int copies
= gio
->io_prop
.zp_copies
;
1847 int gbh_copies
= MIN(copies
+ 1, spa_max_replication(spa
));
1851 error
= metaslab_alloc(spa
, spa_normal_class(spa
), SPA_GANGBLOCKSIZE
,
1852 bp
, gbh_copies
, txg
, pio
== gio
? NULL
: gio
->io_bp
,
1853 METASLAB_HINTBP_FAVOR
| METASLAB_GANG_HEADER
);
1855 pio
->io_error
= error
;
1856 return (ZIO_PIPELINE_CONTINUE
);
1860 gnpp
= &gio
->io_gang_tree
;
1862 gnpp
= pio
->io_private
;
1863 ASSERT(pio
->io_ready
== zio_write_gang_member_ready
);
1866 gn
= zio_gang_node_alloc(gnpp
);
1868 bzero(gbh
, SPA_GANGBLOCKSIZE
);
1871 * Create the gang header.
1873 zio
= zio_rewrite(pio
, spa
, txg
, bp
, gbh
, SPA_GANGBLOCKSIZE
, NULL
, NULL
,
1874 pio
->io_priority
, ZIO_GANG_CHILD_FLAGS(pio
), &pio
->io_bookmark
);
1877 * Create and nowait the gang children.
1879 for (g
= 0; resid
!= 0; resid
-= lsize
, g
++) {
1880 lsize
= P2ROUNDUP(resid
/ (SPA_GBH_NBLKPTRS
- g
),
1882 ASSERT(lsize
>= SPA_MINBLOCKSIZE
&& lsize
<= resid
);
1884 zp
.zp_checksum
= gio
->io_prop
.zp_checksum
;
1885 zp
.zp_compress
= ZIO_COMPRESS_OFF
;
1886 zp
.zp_type
= DMU_OT_NONE
;
1888 zp
.zp_copies
= gio
->io_prop
.zp_copies
;
1890 zp
.zp_dedup_verify
= 0;
1892 zio_nowait(zio_write(zio
, spa
, txg
, &gbh
->zg_blkptr
[g
],
1893 (char *)pio
->io_data
+ (pio
->io_size
- resid
), lsize
, &zp
,
1894 zio_write_gang_member_ready
, NULL
, &gn
->gn_child
[g
],
1895 pio
->io_priority
, ZIO_GANG_CHILD_FLAGS(pio
),
1896 &pio
->io_bookmark
));
1900 * Set pio's pipeline to just wait for zio to finish.
1902 pio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
1905 * We didn't allocate this bp, so make sure it doesn't get unmarked.
1907 pio
->io_flags
&= ~ZIO_FLAG_FASTWRITE
;
1911 return (ZIO_PIPELINE_CONTINUE
);
1915 * ==========================================================================
1917 * ==========================================================================
1920 zio_ddt_child_read_done(zio_t
*zio
)
1922 blkptr_t
*bp
= zio
->io_bp
;
1923 ddt_entry_t
*dde
= zio
->io_private
;
1925 zio_t
*pio
= zio_unique_parent(zio
);
1927 mutex_enter(&pio
->io_lock
);
1928 ddp
= ddt_phys_select(dde
, bp
);
1929 if (zio
->io_error
== 0)
1930 ddt_phys_clear(ddp
); /* this ddp doesn't need repair */
1931 if (zio
->io_error
== 0 && dde
->dde_repair_data
== NULL
)
1932 dde
->dde_repair_data
= zio
->io_data
;
1934 zio_buf_free(zio
->io_data
, zio
->io_size
);
1935 mutex_exit(&pio
->io_lock
);
1939 zio_ddt_read_start(zio_t
*zio
)
1941 blkptr_t
*bp
= zio
->io_bp
;
1944 ASSERT(BP_GET_DEDUP(bp
));
1945 ASSERT(BP_GET_PSIZE(bp
) == zio
->io_size
);
1946 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1948 if (zio
->io_child_error
[ZIO_CHILD_DDT
]) {
1949 ddt_t
*ddt
= ddt_select(zio
->io_spa
, bp
);
1950 ddt_entry_t
*dde
= ddt_repair_start(ddt
, bp
);
1951 ddt_phys_t
*ddp
= dde
->dde_phys
;
1952 ddt_phys_t
*ddp_self
= ddt_phys_select(dde
, bp
);
1955 ASSERT(zio
->io_vsd
== NULL
);
1958 if (ddp_self
== NULL
)
1959 return (ZIO_PIPELINE_CONTINUE
);
1961 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
1962 if (ddp
->ddp_phys_birth
== 0 || ddp
== ddp_self
)
1964 ddt_bp_create(ddt
->ddt_checksum
, &dde
->dde_key
, ddp
,
1966 zio_nowait(zio_read(zio
, zio
->io_spa
, &blk
,
1967 zio_buf_alloc(zio
->io_size
), zio
->io_size
,
1968 zio_ddt_child_read_done
, dde
, zio
->io_priority
,
1969 ZIO_DDT_CHILD_FLAGS(zio
) | ZIO_FLAG_DONT_PROPAGATE
,
1970 &zio
->io_bookmark
));
1972 return (ZIO_PIPELINE_CONTINUE
);
1975 zio_nowait(zio_read(zio
, zio
->io_spa
, bp
,
1976 zio
->io_data
, zio
->io_size
, NULL
, NULL
, zio
->io_priority
,
1977 ZIO_DDT_CHILD_FLAGS(zio
), &zio
->io_bookmark
));
1979 return (ZIO_PIPELINE_CONTINUE
);
1983 zio_ddt_read_done(zio_t
*zio
)
1985 blkptr_t
*bp
= zio
->io_bp
;
1987 if (zio_wait_for_children(zio
, ZIO_CHILD_DDT
, ZIO_WAIT_DONE
))
1988 return (ZIO_PIPELINE_STOP
);
1990 ASSERT(BP_GET_DEDUP(bp
));
1991 ASSERT(BP_GET_PSIZE(bp
) == zio
->io_size
);
1992 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
1994 if (zio
->io_child_error
[ZIO_CHILD_DDT
]) {
1995 ddt_t
*ddt
= ddt_select(zio
->io_spa
, bp
);
1996 ddt_entry_t
*dde
= zio
->io_vsd
;
1998 ASSERT(spa_load_state(zio
->io_spa
) != SPA_LOAD_NONE
);
1999 return (ZIO_PIPELINE_CONTINUE
);
2002 zio
->io_stage
= ZIO_STAGE_DDT_READ_START
>> 1;
2003 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
, B_FALSE
);
2004 return (ZIO_PIPELINE_STOP
);
2006 if (dde
->dde_repair_data
!= NULL
) {
2007 bcopy(dde
->dde_repair_data
, zio
->io_data
, zio
->io_size
);
2008 zio
->io_child_error
[ZIO_CHILD_DDT
] = 0;
2010 ddt_repair_done(ddt
, dde
);
2014 ASSERT(zio
->io_vsd
== NULL
);
2016 return (ZIO_PIPELINE_CONTINUE
);
2020 zio_ddt_collision(zio_t
*zio
, ddt_t
*ddt
, ddt_entry_t
*dde
)
2022 spa_t
*spa
= zio
->io_spa
;
2026 * Note: we compare the original data, not the transformed data,
2027 * because when zio->io_bp is an override bp, we will not have
2028 * pushed the I/O transforms. That's an important optimization
2029 * because otherwise we'd compress/encrypt all dmu_sync() data twice.
2031 for (p
= DDT_PHYS_SINGLE
; p
<= DDT_PHYS_TRIPLE
; p
++) {
2032 zio_t
*lio
= dde
->dde_lead_zio
[p
];
2035 return (lio
->io_orig_size
!= zio
->io_orig_size
||
2036 bcmp(zio
->io_orig_data
, lio
->io_orig_data
,
2037 zio
->io_orig_size
) != 0);
2041 for (p
= DDT_PHYS_SINGLE
; p
<= DDT_PHYS_TRIPLE
; p
++) {
2042 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
2044 if (ddp
->ddp_phys_birth
!= 0) {
2045 arc_buf_t
*abuf
= NULL
;
2046 uint32_t aflags
= ARC_WAIT
;
2047 blkptr_t blk
= *zio
->io_bp
;
2050 ddt_bp_fill(ddp
, &blk
, ddp
->ddp_phys_birth
);
2054 error
= arc_read(NULL
, spa
, &blk
,
2055 arc_getbuf_func
, &abuf
, ZIO_PRIORITY_SYNC_READ
,
2056 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
,
2057 &aflags
, &zio
->io_bookmark
);
2060 if (arc_buf_size(abuf
) != zio
->io_orig_size
||
2061 bcmp(abuf
->b_data
, zio
->io_orig_data
,
2062 zio
->io_orig_size
) != 0)
2064 VERIFY(arc_buf_remove_ref(abuf
, &abuf
) == 1);
2068 return (error
!= 0);
2076 zio_ddt_child_write_ready(zio_t
*zio
)
2078 int p
= zio
->io_prop
.zp_copies
;
2079 ddt_t
*ddt
= ddt_select(zio
->io_spa
, zio
->io_bp
);
2080 ddt_entry_t
*dde
= zio
->io_private
;
2081 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
2089 ASSERT(dde
->dde_lead_zio
[p
] == zio
);
2091 ddt_phys_fill(ddp
, zio
->io_bp
);
2093 while ((pio
= zio_walk_parents(zio
)) != NULL
)
2094 ddt_bp_fill(ddp
, pio
->io_bp
, zio
->io_txg
);
2100 zio_ddt_child_write_done(zio_t
*zio
)
2102 int p
= zio
->io_prop
.zp_copies
;
2103 ddt_t
*ddt
= ddt_select(zio
->io_spa
, zio
->io_bp
);
2104 ddt_entry_t
*dde
= zio
->io_private
;
2105 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
2109 ASSERT(ddp
->ddp_refcnt
== 0);
2110 ASSERT(dde
->dde_lead_zio
[p
] == zio
);
2111 dde
->dde_lead_zio
[p
] = NULL
;
2113 if (zio
->io_error
== 0) {
2114 while (zio_walk_parents(zio
) != NULL
)
2115 ddt_phys_addref(ddp
);
2117 ddt_phys_clear(ddp
);
2124 zio_ddt_ditto_write_done(zio_t
*zio
)
2126 int p
= DDT_PHYS_DITTO
;
2127 blkptr_t
*bp
= zio
->io_bp
;
2128 ddt_t
*ddt
= ddt_select(zio
->io_spa
, bp
);
2129 ddt_entry_t
*dde
= zio
->io_private
;
2130 ddt_phys_t
*ddp
= &dde
->dde_phys
[p
];
2131 ddt_key_t
*ddk
= &dde
->dde_key
;
2132 ASSERTV(zio_prop_t
*zp
= &zio
->io_prop
);
2136 ASSERT(ddp
->ddp_refcnt
== 0);
2137 ASSERT(dde
->dde_lead_zio
[p
] == zio
);
2138 dde
->dde_lead_zio
[p
] = NULL
;
2140 if (zio
->io_error
== 0) {
2141 ASSERT(ZIO_CHECKSUM_EQUAL(bp
->blk_cksum
, ddk
->ddk_cksum
));
2142 ASSERT(zp
->zp_copies
< SPA_DVAS_PER_BP
);
2143 ASSERT(zp
->zp_copies
== BP_GET_NDVAS(bp
) - BP_IS_GANG(bp
));
2144 if (ddp
->ddp_phys_birth
!= 0)
2145 ddt_phys_free(ddt
, ddk
, ddp
, zio
->io_txg
);
2146 ddt_phys_fill(ddp
, bp
);
2153 zio_ddt_write(zio_t
*zio
)
2155 spa_t
*spa
= zio
->io_spa
;
2156 blkptr_t
*bp
= zio
->io_bp
;
2157 uint64_t txg
= zio
->io_txg
;
2158 zio_prop_t
*zp
= &zio
->io_prop
;
2159 int p
= zp
->zp_copies
;
2163 ddt_t
*ddt
= ddt_select(spa
, bp
);
2167 ASSERT(BP_GET_DEDUP(bp
));
2168 ASSERT(BP_GET_CHECKSUM(bp
) == zp
->zp_checksum
);
2169 ASSERT(BP_IS_HOLE(bp
) || zio
->io_bp_override
);
2172 dde
= ddt_lookup(ddt
, bp
, B_TRUE
);
2173 ddp
= &dde
->dde_phys
[p
];
2175 if (zp
->zp_dedup_verify
&& zio_ddt_collision(zio
, ddt
, dde
)) {
2177 * If we're using a weak checksum, upgrade to a strong checksum
2178 * and try again. If we're already using a strong checksum,
2179 * we can't resolve it, so just convert to an ordinary write.
2180 * (And automatically e-mail a paper to Nature?)
2182 if (!zio_checksum_table
[zp
->zp_checksum
].ci_dedup
) {
2183 zp
->zp_checksum
= spa_dedup_checksum(spa
);
2184 zio_pop_transforms(zio
);
2185 zio
->io_stage
= ZIO_STAGE_OPEN
;
2190 zio
->io_pipeline
= ZIO_WRITE_PIPELINE
;
2192 return (ZIO_PIPELINE_CONTINUE
);
2195 ditto_copies
= ddt_ditto_copies_needed(ddt
, dde
, ddp
);
2196 ASSERT(ditto_copies
< SPA_DVAS_PER_BP
);
2198 if (ditto_copies
> ddt_ditto_copies_present(dde
) &&
2199 dde
->dde_lead_zio
[DDT_PHYS_DITTO
] == NULL
) {
2200 zio_prop_t czp
= *zp
;
2202 czp
.zp_copies
= ditto_copies
;
2205 * If we arrived here with an override bp, we won't have run
2206 * the transform stack, so we won't have the data we need to
2207 * generate a child i/o. So, toss the override bp and restart.
2208 * This is safe, because using the override bp is just an
2209 * optimization; and it's rare, so the cost doesn't matter.
2211 if (zio
->io_bp_override
) {
2212 zio_pop_transforms(zio
);
2213 zio
->io_stage
= ZIO_STAGE_OPEN
;
2214 zio
->io_pipeline
= ZIO_WRITE_PIPELINE
;
2215 zio
->io_bp_override
= NULL
;
2218 return (ZIO_PIPELINE_CONTINUE
);
2221 dio
= zio_write(zio
, spa
, txg
, bp
, zio
->io_orig_data
,
2222 zio
->io_orig_size
, &czp
, NULL
,
2223 zio_ddt_ditto_write_done
, dde
, zio
->io_priority
,
2224 ZIO_DDT_CHILD_FLAGS(zio
), &zio
->io_bookmark
);
2226 zio_push_transform(dio
, zio
->io_data
, zio
->io_size
, 0, NULL
);
2227 dde
->dde_lead_zio
[DDT_PHYS_DITTO
] = dio
;
2230 if (ddp
->ddp_phys_birth
!= 0 || dde
->dde_lead_zio
[p
] != NULL
) {
2231 if (ddp
->ddp_phys_birth
!= 0)
2232 ddt_bp_fill(ddp
, bp
, txg
);
2233 if (dde
->dde_lead_zio
[p
] != NULL
)
2234 zio_add_child(zio
, dde
->dde_lead_zio
[p
]);
2236 ddt_phys_addref(ddp
);
2237 } else if (zio
->io_bp_override
) {
2238 ASSERT(bp
->blk_birth
== txg
);
2239 ASSERT(BP_EQUAL(bp
, zio
->io_bp_override
));
2240 ddt_phys_fill(ddp
, bp
);
2241 ddt_phys_addref(ddp
);
2243 cio
= zio_write(zio
, spa
, txg
, bp
, zio
->io_orig_data
,
2244 zio
->io_orig_size
, zp
, zio_ddt_child_write_ready
,
2245 zio_ddt_child_write_done
, dde
, zio
->io_priority
,
2246 ZIO_DDT_CHILD_FLAGS(zio
), &zio
->io_bookmark
);
2248 zio_push_transform(cio
, zio
->io_data
, zio
->io_size
, 0, NULL
);
2249 dde
->dde_lead_zio
[p
] = cio
;
2259 return (ZIO_PIPELINE_CONTINUE
);
2262 ddt_entry_t
*freedde
; /* for debugging */
2265 zio_ddt_free(zio_t
*zio
)
2267 spa_t
*spa
= zio
->io_spa
;
2268 blkptr_t
*bp
= zio
->io_bp
;
2269 ddt_t
*ddt
= ddt_select(spa
, bp
);
2273 ASSERT(BP_GET_DEDUP(bp
));
2274 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
2277 freedde
= dde
= ddt_lookup(ddt
, bp
, B_TRUE
);
2279 ddp
= ddt_phys_select(dde
, bp
);
2281 ddt_phys_decref(ddp
);
2285 return (ZIO_PIPELINE_CONTINUE
);
2289 * ==========================================================================
2290 * Allocate and free blocks
2291 * ==========================================================================
2294 zio_dva_allocate(zio_t
*zio
)
2296 spa_t
*spa
= zio
->io_spa
;
2297 metaslab_class_t
*mc
= spa_normal_class(spa
);
2298 blkptr_t
*bp
= zio
->io_bp
;
2302 if (zio
->io_gang_leader
== NULL
) {
2303 ASSERT(zio
->io_child_type
> ZIO_CHILD_GANG
);
2304 zio
->io_gang_leader
= zio
;
2307 ASSERT(BP_IS_HOLE(bp
));
2308 ASSERT0(BP_GET_NDVAS(bp
));
2309 ASSERT3U(zio
->io_prop
.zp_copies
, >, 0);
2310 ASSERT3U(zio
->io_prop
.zp_copies
, <=, spa_max_replication(spa
));
2311 ASSERT3U(zio
->io_size
, ==, BP_GET_PSIZE(bp
));
2314 * The dump device does not support gang blocks so allocation on
2315 * behalf of the dump device (i.e. ZIO_FLAG_NODATA) must avoid
2316 * the "fast" gang feature.
2318 flags
|= (zio
->io_flags
& ZIO_FLAG_NODATA
) ? METASLAB_GANG_AVOID
: 0;
2319 flags
|= (zio
->io_flags
& ZIO_FLAG_GANG_CHILD
) ?
2320 METASLAB_GANG_CHILD
: 0;
2321 flags
|= (zio
->io_flags
& ZIO_FLAG_FASTWRITE
) ? METASLAB_FASTWRITE
: 0;
2322 error
= metaslab_alloc(spa
, mc
, zio
->io_size
, bp
,
2323 zio
->io_prop
.zp_copies
, zio
->io_txg
, NULL
, flags
);
2326 spa_dbgmsg(spa
, "%s: metaslab allocation failure: zio %p, "
2327 "size %llu, error %d", spa_name(spa
), zio
, zio
->io_size
,
2329 if (error
== ENOSPC
&& zio
->io_size
> SPA_MINBLOCKSIZE
)
2330 return (zio_write_gang_block(zio
));
2331 zio
->io_error
= error
;
2334 return (ZIO_PIPELINE_CONTINUE
);
2338 zio_dva_free(zio_t
*zio
)
2340 metaslab_free(zio
->io_spa
, zio
->io_bp
, zio
->io_txg
, B_FALSE
);
2342 return (ZIO_PIPELINE_CONTINUE
);
2346 zio_dva_claim(zio_t
*zio
)
2350 error
= metaslab_claim(zio
->io_spa
, zio
->io_bp
, zio
->io_txg
);
2352 zio
->io_error
= error
;
2354 return (ZIO_PIPELINE_CONTINUE
);
2358 * Undo an allocation. This is used by zio_done() when an I/O fails
2359 * and we want to give back the block we just allocated.
2360 * This handles both normal blocks and gang blocks.
2363 zio_dva_unallocate(zio_t
*zio
, zio_gang_node_t
*gn
, blkptr_t
*bp
)
2367 ASSERT(bp
->blk_birth
== zio
->io_txg
|| BP_IS_HOLE(bp
));
2368 ASSERT(zio
->io_bp_override
== NULL
);
2370 if (!BP_IS_HOLE(bp
))
2371 metaslab_free(zio
->io_spa
, bp
, bp
->blk_birth
, B_TRUE
);
2374 for (g
= 0; g
< SPA_GBH_NBLKPTRS
; g
++) {
2375 zio_dva_unallocate(zio
, gn
->gn_child
[g
],
2376 &gn
->gn_gbh
->zg_blkptr
[g
]);
2382 * Try to allocate an intent log block. Return 0 on success, errno on failure.
2385 zio_alloc_zil(spa_t
*spa
, uint64_t txg
, blkptr_t
*new_bp
, uint64_t size
,
2390 ASSERT(txg
> spa_syncing_txg(spa
));
2393 * ZIL blocks are always contiguous (i.e. not gang blocks) so we
2394 * set the METASLAB_GANG_AVOID flag so that they don't "fast gang"
2395 * when allocating them.
2398 error
= metaslab_alloc(spa
, spa_log_class(spa
), size
,
2399 new_bp
, 1, txg
, NULL
,
2400 METASLAB_FASTWRITE
| METASLAB_GANG_AVOID
);
2404 error
= metaslab_alloc(spa
, spa_normal_class(spa
), size
,
2405 new_bp
, 1, txg
, NULL
,
2406 METASLAB_FASTWRITE
| METASLAB_GANG_AVOID
);
2410 BP_SET_LSIZE(new_bp
, size
);
2411 BP_SET_PSIZE(new_bp
, size
);
2412 BP_SET_COMPRESS(new_bp
, ZIO_COMPRESS_OFF
);
2413 BP_SET_CHECKSUM(new_bp
,
2414 spa_version(spa
) >= SPA_VERSION_SLIM_ZIL
2415 ? ZIO_CHECKSUM_ZILOG2
: ZIO_CHECKSUM_ZILOG
);
2416 BP_SET_TYPE(new_bp
, DMU_OT_INTENT_LOG
);
2417 BP_SET_LEVEL(new_bp
, 0);
2418 BP_SET_DEDUP(new_bp
, 0);
2419 BP_SET_BYTEORDER(new_bp
, ZFS_HOST_BYTEORDER
);
2426 * Free an intent log block.
2429 zio_free_zil(spa_t
*spa
, uint64_t txg
, blkptr_t
*bp
)
2431 ASSERT(BP_GET_TYPE(bp
) == DMU_OT_INTENT_LOG
);
2432 ASSERT(!BP_IS_GANG(bp
));
2434 zio_free(spa
, txg
, bp
);
2438 * ==========================================================================
2439 * Read and write to physical devices
2440 * ==========================================================================
2443 zio_vdev_io_start(zio_t
*zio
)
2445 vdev_t
*vd
= zio
->io_vd
;
2447 spa_t
*spa
= zio
->io_spa
;
2449 ASSERT(zio
->io_error
== 0);
2450 ASSERT(zio
->io_child_error
[ZIO_CHILD_VDEV
] == 0);
2453 if (!(zio
->io_flags
& ZIO_FLAG_CONFIG_WRITER
))
2454 spa_config_enter(spa
, SCL_ZIO
, zio
, RW_READER
);
2457 * The mirror_ops handle multiple DVAs in a single BP.
2459 return (vdev_mirror_ops
.vdev_op_io_start(zio
));
2463 * We keep track of time-sensitive I/Os so that the scan thread
2464 * can quickly react to certain workloads. In particular, we care
2465 * about non-scrubbing, top-level reads and writes with the following
2467 * - synchronous writes of user data to non-slog devices
2468 * - any reads of user data
2469 * When these conditions are met, adjust the timestamp of spa_last_io
2470 * which allows the scan thread to adjust its workload accordingly.
2472 if (!(zio
->io_flags
& ZIO_FLAG_SCAN_THREAD
) && zio
->io_bp
!= NULL
&&
2473 vd
== vd
->vdev_top
&& !vd
->vdev_islog
&&
2474 zio
->io_bookmark
.zb_objset
!= DMU_META_OBJSET
&&
2475 zio
->io_txg
!= spa_syncing_txg(spa
)) {
2476 uint64_t old
= spa
->spa_last_io
;
2477 uint64_t new = ddi_get_lbolt64();
2479 (void) atomic_cas_64(&spa
->spa_last_io
, old
, new);
2482 align
= 1ULL << vd
->vdev_top
->vdev_ashift
;
2484 if (P2PHASE(zio
->io_size
, align
) != 0) {
2485 uint64_t asize
= P2ROUNDUP(zio
->io_size
, align
);
2486 char *abuf
= zio_buf_alloc(asize
);
2487 ASSERT(vd
== vd
->vdev_top
);
2488 if (zio
->io_type
== ZIO_TYPE_WRITE
) {
2489 bcopy(zio
->io_data
, abuf
, zio
->io_size
);
2490 bzero(abuf
+ zio
->io_size
, asize
- zio
->io_size
);
2492 zio_push_transform(zio
, abuf
, asize
, asize
, zio_subblock
);
2495 ASSERT(P2PHASE(zio
->io_offset
, align
) == 0);
2496 ASSERT(P2PHASE(zio
->io_size
, align
) == 0);
2497 VERIFY(zio
->io_type
!= ZIO_TYPE_WRITE
|| spa_writeable(spa
));
2500 * If this is a repair I/O, and there's no self-healing involved --
2501 * that is, we're just resilvering what we expect to resilver --
2502 * then don't do the I/O unless zio's txg is actually in vd's DTL.
2503 * This prevents spurious resilvering with nested replication.
2504 * For example, given a mirror of mirrors, (A+B)+(C+D), if only
2505 * A is out of date, we'll read from C+D, then use the data to
2506 * resilver A+B -- but we don't actually want to resilver B, just A.
2507 * The top-level mirror has no way to know this, so instead we just
2508 * discard unnecessary repairs as we work our way down the vdev tree.
2509 * The same logic applies to any form of nested replication:
2510 * ditto + mirror, RAID-Z + replacing, etc. This covers them all.
2512 if ((zio
->io_flags
& ZIO_FLAG_IO_REPAIR
) &&
2513 !(zio
->io_flags
& ZIO_FLAG_SELF_HEAL
) &&
2514 zio
->io_txg
!= 0 && /* not a delegated i/o */
2515 !vdev_dtl_contains(vd
, DTL_PARTIAL
, zio
->io_txg
, 1)) {
2516 ASSERT(zio
->io_type
== ZIO_TYPE_WRITE
);
2517 zio_vdev_io_bypass(zio
);
2518 return (ZIO_PIPELINE_CONTINUE
);
2521 if (vd
->vdev_ops
->vdev_op_leaf
&&
2522 (zio
->io_type
== ZIO_TYPE_READ
|| zio
->io_type
== ZIO_TYPE_WRITE
)) {
2524 if (zio
->io_type
== ZIO_TYPE_READ
&& vdev_cache_read(zio
) == 0)
2525 return (ZIO_PIPELINE_CONTINUE
);
2527 if ((zio
= vdev_queue_io(zio
)) == NULL
)
2528 return (ZIO_PIPELINE_STOP
);
2530 if (!vdev_accessible(vd
, zio
)) {
2531 zio
->io_error
= ENXIO
;
2533 return (ZIO_PIPELINE_STOP
);
2537 return (vd
->vdev_ops
->vdev_op_io_start(zio
));
2541 zio_vdev_io_done(zio_t
*zio
)
2543 vdev_t
*vd
= zio
->io_vd
;
2544 vdev_ops_t
*ops
= vd
? vd
->vdev_ops
: &vdev_mirror_ops
;
2545 boolean_t unexpected_error
= B_FALSE
;
2547 if (zio_wait_for_children(zio
, ZIO_CHILD_VDEV
, ZIO_WAIT_DONE
))
2548 return (ZIO_PIPELINE_STOP
);
2550 ASSERT(zio
->io_type
== ZIO_TYPE_READ
|| zio
->io_type
== ZIO_TYPE_WRITE
);
2552 if (vd
!= NULL
&& vd
->vdev_ops
->vdev_op_leaf
) {
2554 vdev_queue_io_done(zio
);
2556 if (zio
->io_type
== ZIO_TYPE_WRITE
)
2557 vdev_cache_write(zio
);
2559 if (zio_injection_enabled
&& zio
->io_error
== 0)
2560 zio
->io_error
= zio_handle_device_injection(vd
,
2563 if (zio_injection_enabled
&& zio
->io_error
== 0)
2564 zio
->io_error
= zio_handle_label_injection(zio
, EIO
);
2566 if (zio
->io_error
) {
2567 if (!vdev_accessible(vd
, zio
)) {
2568 zio
->io_error
= ENXIO
;
2570 unexpected_error
= B_TRUE
;
2575 ops
->vdev_op_io_done(zio
);
2577 if (unexpected_error
)
2578 VERIFY(vdev_probe(vd
, zio
) == NULL
);
2580 return (ZIO_PIPELINE_CONTINUE
);
2584 * For non-raidz ZIOs, we can just copy aside the bad data read from the
2585 * disk, and use that to finish the checksum ereport later.
2588 zio_vsd_default_cksum_finish(zio_cksum_report_t
*zcr
,
2589 const void *good_buf
)
2591 /* no processing needed */
2592 zfs_ereport_finish_checksum(zcr
, good_buf
, zcr
->zcr_cbdata
, B_FALSE
);
2597 zio_vsd_default_cksum_report(zio_t
*zio
, zio_cksum_report_t
*zcr
, void *ignored
)
2599 void *buf
= zio_buf_alloc(zio
->io_size
);
2601 bcopy(zio
->io_data
, buf
, zio
->io_size
);
2603 zcr
->zcr_cbinfo
= zio
->io_size
;
2604 zcr
->zcr_cbdata
= buf
;
2605 zcr
->zcr_finish
= zio_vsd_default_cksum_finish
;
2606 zcr
->zcr_free
= zio_buf_free
;
2610 zio_vdev_io_assess(zio_t
*zio
)
2612 vdev_t
*vd
= zio
->io_vd
;
2614 if (zio_wait_for_children(zio
, ZIO_CHILD_VDEV
, ZIO_WAIT_DONE
))
2615 return (ZIO_PIPELINE_STOP
);
2617 if (vd
== NULL
&& !(zio
->io_flags
& ZIO_FLAG_CONFIG_WRITER
))
2618 spa_config_exit(zio
->io_spa
, SCL_ZIO
, zio
);
2620 if (zio
->io_vsd
!= NULL
) {
2621 zio
->io_vsd_ops
->vsd_free(zio
);
2625 if (zio_injection_enabled
&& zio
->io_error
== 0)
2626 zio
->io_error
= zio_handle_fault_injection(zio
, EIO
);
2629 * If the I/O failed, determine whether we should attempt to retry it.
2631 * On retry, we cut in line in the issue queue, since we don't want
2632 * compression/checksumming/etc. work to prevent our (cheap) IO reissue.
2634 if (zio
->io_error
&& vd
== NULL
&&
2635 !(zio
->io_flags
& (ZIO_FLAG_DONT_RETRY
| ZIO_FLAG_IO_RETRY
))) {
2636 ASSERT(!(zio
->io_flags
& ZIO_FLAG_DONT_QUEUE
)); /* not a leaf */
2637 ASSERT(!(zio
->io_flags
& ZIO_FLAG_IO_BYPASS
)); /* not a leaf */
2639 zio
->io_flags
|= ZIO_FLAG_IO_RETRY
|
2640 ZIO_FLAG_DONT_CACHE
| ZIO_FLAG_DONT_AGGREGATE
;
2641 zio
->io_stage
= ZIO_STAGE_VDEV_IO_START
>> 1;
2642 zio_taskq_dispatch(zio
, ZIO_TASKQ_ISSUE
,
2643 zio_requeue_io_start_cut_in_line
);
2644 return (ZIO_PIPELINE_STOP
);
2648 * If we got an error on a leaf device, convert it to ENXIO
2649 * if the device is not accessible at all.
2651 if (zio
->io_error
&& vd
!= NULL
&& vd
->vdev_ops
->vdev_op_leaf
&&
2652 !vdev_accessible(vd
, zio
))
2653 zio
->io_error
= ENXIO
;
2656 * If we can't write to an interior vdev (mirror or RAID-Z),
2657 * set vdev_cant_write so that we stop trying to allocate from it.
2659 if (zio
->io_error
== ENXIO
&& zio
->io_type
== ZIO_TYPE_WRITE
&&
2660 vd
!= NULL
&& !vd
->vdev_ops
->vdev_op_leaf
)
2661 vd
->vdev_cant_write
= B_TRUE
;
2664 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
2666 return (ZIO_PIPELINE_CONTINUE
);
2670 zio_vdev_io_reissue(zio_t
*zio
)
2672 ASSERT(zio
->io_stage
== ZIO_STAGE_VDEV_IO_START
);
2673 ASSERT(zio
->io_error
== 0);
2675 zio
->io_stage
>>= 1;
2679 zio_vdev_io_redone(zio_t
*zio
)
2681 ASSERT(zio
->io_stage
== ZIO_STAGE_VDEV_IO_DONE
);
2683 zio
->io_stage
>>= 1;
2687 zio_vdev_io_bypass(zio_t
*zio
)
2689 ASSERT(zio
->io_stage
== ZIO_STAGE_VDEV_IO_START
);
2690 ASSERT(zio
->io_error
== 0);
2692 zio
->io_flags
|= ZIO_FLAG_IO_BYPASS
;
2693 zio
->io_stage
= ZIO_STAGE_VDEV_IO_ASSESS
>> 1;
2697 * ==========================================================================
2698 * Generate and verify checksums
2699 * ==========================================================================
2702 zio_checksum_generate(zio_t
*zio
)
2704 blkptr_t
*bp
= zio
->io_bp
;
2705 enum zio_checksum checksum
;
2709 * This is zio_write_phys().
2710 * We're either generating a label checksum, or none at all.
2712 checksum
= zio
->io_prop
.zp_checksum
;
2714 if (checksum
== ZIO_CHECKSUM_OFF
)
2715 return (ZIO_PIPELINE_CONTINUE
);
2717 ASSERT(checksum
== ZIO_CHECKSUM_LABEL
);
2719 if (BP_IS_GANG(bp
) && zio
->io_child_type
== ZIO_CHILD_GANG
) {
2720 ASSERT(!IO_IS_ALLOCATING(zio
));
2721 checksum
= ZIO_CHECKSUM_GANG_HEADER
;
2723 checksum
= BP_GET_CHECKSUM(bp
);
2727 zio_checksum_compute(zio
, checksum
, zio
->io_data
, zio
->io_size
);
2729 return (ZIO_PIPELINE_CONTINUE
);
2733 zio_checksum_verify(zio_t
*zio
)
2735 zio_bad_cksum_t info
;
2736 blkptr_t
*bp
= zio
->io_bp
;
2739 ASSERT(zio
->io_vd
!= NULL
);
2743 * This is zio_read_phys().
2744 * We're either verifying a label checksum, or nothing at all.
2746 if (zio
->io_prop
.zp_checksum
== ZIO_CHECKSUM_OFF
)
2747 return (ZIO_PIPELINE_CONTINUE
);
2749 ASSERT(zio
->io_prop
.zp_checksum
== ZIO_CHECKSUM_LABEL
);
2752 if ((error
= zio_checksum_error(zio
, &info
)) != 0) {
2753 zio
->io_error
= error
;
2754 if (!(zio
->io_flags
& ZIO_FLAG_SPECULATIVE
)) {
2755 zfs_ereport_start_checksum(zio
->io_spa
,
2756 zio
->io_vd
, zio
, zio
->io_offset
,
2757 zio
->io_size
, NULL
, &info
);
2761 return (ZIO_PIPELINE_CONTINUE
);
2765 * Called by RAID-Z to ensure we don't compute the checksum twice.
2768 zio_checksum_verified(zio_t
*zio
)
2770 zio
->io_pipeline
&= ~ZIO_STAGE_CHECKSUM_VERIFY
;
2774 * ==========================================================================
2775 * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other.
2776 * An error of 0 indictes success. ENXIO indicates whole-device failure,
2777 * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO
2778 * indicate errors that are specific to one I/O, and most likely permanent.
2779 * Any other error is presumed to be worse because we weren't expecting it.
2780 * ==========================================================================
2783 zio_worst_error(int e1
, int e2
)
2785 static int zio_error_rank
[] = { 0, ENXIO
, ECKSUM
, EIO
};
2788 for (r1
= 0; r1
< sizeof (zio_error_rank
) / sizeof (int); r1
++)
2789 if (e1
== zio_error_rank
[r1
])
2792 for (r2
= 0; r2
< sizeof (zio_error_rank
) / sizeof (int); r2
++)
2793 if (e2
== zio_error_rank
[r2
])
2796 return (r1
> r2
? e1
: e2
);
2800 * ==========================================================================
2802 * ==========================================================================
2805 zio_ready(zio_t
*zio
)
2807 blkptr_t
*bp
= zio
->io_bp
;
2808 zio_t
*pio
, *pio_next
;
2810 if (zio_wait_for_children(zio
, ZIO_CHILD_GANG
, ZIO_WAIT_READY
) ||
2811 zio_wait_for_children(zio
, ZIO_CHILD_DDT
, ZIO_WAIT_READY
))
2812 return (ZIO_PIPELINE_STOP
);
2814 if (zio
->io_ready
) {
2815 ASSERT(IO_IS_ALLOCATING(zio
));
2816 ASSERT(bp
->blk_birth
== zio
->io_txg
|| BP_IS_HOLE(bp
));
2817 ASSERT(zio
->io_children
[ZIO_CHILD_GANG
][ZIO_WAIT_READY
] == 0);
2822 if (bp
!= NULL
&& bp
!= &zio
->io_bp_copy
)
2823 zio
->io_bp_copy
= *bp
;
2826 zio
->io_pipeline
= ZIO_INTERLOCK_PIPELINE
;
2828 mutex_enter(&zio
->io_lock
);
2829 zio
->io_state
[ZIO_WAIT_READY
] = 1;
2830 pio
= zio_walk_parents(zio
);
2831 mutex_exit(&zio
->io_lock
);
2834 * As we notify zio's parents, new parents could be added.
2835 * New parents go to the head of zio's io_parent_list, however,
2836 * so we will (correctly) not notify them. The remainder of zio's
2837 * io_parent_list, from 'pio_next' onward, cannot change because
2838 * all parents must wait for us to be done before they can be done.
2840 for (; pio
!= NULL
; pio
= pio_next
) {
2841 pio_next
= zio_walk_parents(zio
);
2842 zio_notify_parent(pio
, zio
, ZIO_WAIT_READY
);
2845 if (zio
->io_flags
& ZIO_FLAG_NODATA
) {
2846 if (BP_IS_GANG(bp
)) {
2847 zio
->io_flags
&= ~ZIO_FLAG_NODATA
;
2849 ASSERT((uintptr_t)zio
->io_data
< SPA_MAXBLOCKSIZE
);
2850 zio
->io_pipeline
&= ~ZIO_VDEV_IO_STAGES
;
2854 if (zio_injection_enabled
&&
2855 zio
->io_spa
->spa_syncing_txg
== zio
->io_txg
)
2856 zio_handle_ignored_writes(zio
);
2858 return (ZIO_PIPELINE_CONTINUE
);
2862 zio_done(zio_t
*zio
)
2864 zio_t
*pio
, *pio_next
;
2868 * If our children haven't all completed,
2869 * wait for them and then repeat this pipeline stage.
2871 if (zio_wait_for_children(zio
, ZIO_CHILD_VDEV
, ZIO_WAIT_DONE
) ||
2872 zio_wait_for_children(zio
, ZIO_CHILD_GANG
, ZIO_WAIT_DONE
) ||
2873 zio_wait_for_children(zio
, ZIO_CHILD_DDT
, ZIO_WAIT_DONE
) ||
2874 zio_wait_for_children(zio
, ZIO_CHILD_LOGICAL
, ZIO_WAIT_DONE
))
2875 return (ZIO_PIPELINE_STOP
);
2877 for (c
= 0; c
< ZIO_CHILD_TYPES
; c
++)
2878 for (w
= 0; w
< ZIO_WAIT_TYPES
; w
++)
2879 ASSERT(zio
->io_children
[c
][w
] == 0);
2881 if (zio
->io_bp
!= NULL
) {
2882 ASSERT(zio
->io_bp
->blk_pad
[0] == 0);
2883 ASSERT(zio
->io_bp
->blk_pad
[1] == 0);
2884 ASSERT(bcmp(zio
->io_bp
, &zio
->io_bp_copy
, sizeof (blkptr_t
)) == 0 ||
2885 (zio
->io_bp
== zio_unique_parent(zio
)->io_bp
));
2886 if (zio
->io_type
== ZIO_TYPE_WRITE
&& !BP_IS_HOLE(zio
->io_bp
) &&
2887 zio
->io_bp_override
== NULL
&&
2888 !(zio
->io_flags
& ZIO_FLAG_IO_REPAIR
)) {
2889 ASSERT(!BP_SHOULD_BYTESWAP(zio
->io_bp
));
2890 ASSERT3U(zio
->io_prop
.zp_copies
, <=, BP_GET_NDVAS(zio
->io_bp
));
2891 ASSERT(BP_COUNT_GANG(zio
->io_bp
) == 0 ||
2892 (BP_COUNT_GANG(zio
->io_bp
) == BP_GET_NDVAS(zio
->io_bp
)));
2897 * If there were child vdev/gang/ddt errors, they apply to us now.
2899 zio_inherit_child_errors(zio
, ZIO_CHILD_VDEV
);
2900 zio_inherit_child_errors(zio
, ZIO_CHILD_GANG
);
2901 zio_inherit_child_errors(zio
, ZIO_CHILD_DDT
);
2904 * If the I/O on the transformed data was successful, generate any
2905 * checksum reports now while we still have the transformed data.
2907 if (zio
->io_error
== 0) {
2908 while (zio
->io_cksum_report
!= NULL
) {
2909 zio_cksum_report_t
*zcr
= zio
->io_cksum_report
;
2910 uint64_t align
= zcr
->zcr_align
;
2911 uint64_t asize
= P2ROUNDUP(zio
->io_size
, align
);
2912 char *abuf
= zio
->io_data
;
2914 if (asize
!= zio
->io_size
) {
2915 abuf
= zio_buf_alloc(asize
);
2916 bcopy(zio
->io_data
, abuf
, zio
->io_size
);
2917 bzero(abuf
+ zio
->io_size
, asize
- zio
->io_size
);
2920 zio
->io_cksum_report
= zcr
->zcr_next
;
2921 zcr
->zcr_next
= NULL
;
2922 zcr
->zcr_finish(zcr
, abuf
);
2923 zfs_ereport_free_checksum(zcr
);
2925 if (asize
!= zio
->io_size
)
2926 zio_buf_free(abuf
, asize
);
2930 zio_pop_transforms(zio
); /* note: may set zio->io_error */
2932 vdev_stat_update(zio
, zio
->io_size
);
2935 * If this I/O is attached to a particular vdev is slow, exceeding
2936 * 30 seconds to complete, post an error described the I/O delay.
2937 * We ignore these errors if the device is currently unavailable.
2939 if (zio
->io_delay
>= MSEC_TO_TICK(zio_delay_max
)) {
2940 if (zio
->io_vd
!= NULL
&& !vdev_is_dead(zio
->io_vd
))
2941 zfs_ereport_post(FM_EREPORT_ZFS_DELAY
, zio
->io_spa
,
2942 zio
->io_vd
, zio
, 0, 0);
2945 if (zio
->io_error
) {
2947 * If this I/O is attached to a particular vdev,
2948 * generate an error message describing the I/O failure
2949 * at the block level. We ignore these errors if the
2950 * device is currently unavailable.
2952 if (zio
->io_error
!= ECKSUM
&& zio
->io_vd
!= NULL
&&
2953 !vdev_is_dead(zio
->io_vd
))
2954 zfs_ereport_post(FM_EREPORT_ZFS_IO
, zio
->io_spa
,
2955 zio
->io_vd
, zio
, 0, 0);
2957 if ((zio
->io_error
== EIO
|| !(zio
->io_flags
&
2958 (ZIO_FLAG_SPECULATIVE
| ZIO_FLAG_DONT_PROPAGATE
))) &&
2959 zio
== zio
->io_logical
) {
2961 * For logical I/O requests, tell the SPA to log the
2962 * error and generate a logical data ereport.
2964 spa_log_error(zio
->io_spa
, zio
);
2965 zfs_ereport_post(FM_EREPORT_ZFS_DATA
, zio
->io_spa
, NULL
, zio
,
2970 if (zio
->io_error
&& zio
== zio
->io_logical
) {
2972 * Determine whether zio should be reexecuted. This will
2973 * propagate all the way to the root via zio_notify_parent().
2975 ASSERT(zio
->io_vd
== NULL
&& zio
->io_bp
!= NULL
);
2976 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
2978 if (IO_IS_ALLOCATING(zio
) &&
2979 !(zio
->io_flags
& ZIO_FLAG_CANFAIL
)) {
2980 if (zio
->io_error
!= ENOSPC
)
2981 zio
->io_reexecute
|= ZIO_REEXECUTE_NOW
;
2983 zio
->io_reexecute
|= ZIO_REEXECUTE_SUSPEND
;
2986 if ((zio
->io_type
== ZIO_TYPE_READ
||
2987 zio
->io_type
== ZIO_TYPE_FREE
) &&
2988 !(zio
->io_flags
& ZIO_FLAG_SCAN_THREAD
) &&
2989 zio
->io_error
== ENXIO
&&
2990 spa_load_state(zio
->io_spa
) == SPA_LOAD_NONE
&&
2991 spa_get_failmode(zio
->io_spa
) != ZIO_FAILURE_MODE_CONTINUE
)
2992 zio
->io_reexecute
|= ZIO_REEXECUTE_SUSPEND
;
2994 if (!(zio
->io_flags
& ZIO_FLAG_CANFAIL
) && !zio
->io_reexecute
)
2995 zio
->io_reexecute
|= ZIO_REEXECUTE_SUSPEND
;
2998 * Here is a possibly good place to attempt to do
2999 * either combinatorial reconstruction or error correction
3000 * based on checksums. It also might be a good place
3001 * to send out preliminary ereports before we suspend
3007 * If there were logical child errors, they apply to us now.
3008 * We defer this until now to avoid conflating logical child
3009 * errors with errors that happened to the zio itself when
3010 * updating vdev stats and reporting FMA events above.
3012 zio_inherit_child_errors(zio
, ZIO_CHILD_LOGICAL
);
3014 if ((zio
->io_error
|| zio
->io_reexecute
) &&
3015 IO_IS_ALLOCATING(zio
) && zio
->io_gang_leader
== zio
&&
3016 !(zio
->io_flags
& ZIO_FLAG_IO_REWRITE
))
3017 zio_dva_unallocate(zio
, zio
->io_gang_tree
, zio
->io_bp
);
3019 zio_gang_tree_free(&zio
->io_gang_tree
);
3022 * Godfather I/Os should never suspend.
3024 if ((zio
->io_flags
& ZIO_FLAG_GODFATHER
) &&
3025 (zio
->io_reexecute
& ZIO_REEXECUTE_SUSPEND
))
3026 zio
->io_reexecute
= 0;
3028 if (zio
->io_reexecute
) {
3030 * This is a logical I/O that wants to reexecute.
3032 * Reexecute is top-down. When an i/o fails, if it's not
3033 * the root, it simply notifies its parent and sticks around.
3034 * The parent, seeing that it still has children in zio_done(),
3035 * does the same. This percolates all the way up to the root.
3036 * The root i/o will reexecute or suspend the entire tree.
3038 * This approach ensures that zio_reexecute() honors
3039 * all the original i/o dependency relationships, e.g.
3040 * parents not executing until children are ready.
3042 ASSERT(zio
->io_child_type
== ZIO_CHILD_LOGICAL
);
3044 zio
->io_gang_leader
= NULL
;
3046 mutex_enter(&zio
->io_lock
);
3047 zio
->io_state
[ZIO_WAIT_DONE
] = 1;
3048 mutex_exit(&zio
->io_lock
);
3051 * "The Godfather" I/O monitors its children but is
3052 * not a true parent to them. It will track them through
3053 * the pipeline but severs its ties whenever they get into
3054 * trouble (e.g. suspended). This allows "The Godfather"
3055 * I/O to return status without blocking.
3057 for (pio
= zio_walk_parents(zio
); pio
!= NULL
; pio
= pio_next
) {
3058 zio_link_t
*zl
= zio
->io_walk_link
;
3059 pio_next
= zio_walk_parents(zio
);
3061 if ((pio
->io_flags
& ZIO_FLAG_GODFATHER
) &&
3062 (zio
->io_reexecute
& ZIO_REEXECUTE_SUSPEND
)) {
3063 zio_remove_child(pio
, zio
, zl
);
3064 zio_notify_parent(pio
, zio
, ZIO_WAIT_DONE
);
3068 if ((pio
= zio_unique_parent(zio
)) != NULL
) {
3070 * We're not a root i/o, so there's nothing to do
3071 * but notify our parent. Don't propagate errors
3072 * upward since we haven't permanently failed yet.
3074 ASSERT(!(zio
->io_flags
& ZIO_FLAG_GODFATHER
));
3075 zio
->io_flags
|= ZIO_FLAG_DONT_PROPAGATE
;
3076 zio_notify_parent(pio
, zio
, ZIO_WAIT_DONE
);
3077 } else if (zio
->io_reexecute
& ZIO_REEXECUTE_SUSPEND
) {
3079 * We'd fail again if we reexecuted now, so suspend
3080 * until conditions improve (e.g. device comes online).
3082 zio_suspend(zio
->io_spa
, zio
);
3085 * Reexecution is potentially a huge amount of work.
3086 * Hand it off to the otherwise-unused claim taskq.
3088 ASSERT(taskq_empty_ent(&zio
->io_tqent
));
3089 spa_taskq_dispatch_ent(zio
->io_spa
,
3090 ZIO_TYPE_CLAIM
, ZIO_TASKQ_ISSUE
,
3091 (task_func_t
*)zio_reexecute
, zio
, 0,
3094 return (ZIO_PIPELINE_STOP
);
3097 ASSERT(zio
->io_child_count
== 0);
3098 ASSERT(zio
->io_reexecute
== 0);
3099 ASSERT(zio
->io_error
== 0 || (zio
->io_flags
& ZIO_FLAG_CANFAIL
));
3102 * Report any checksum errors, since the I/O is complete.
3104 while (zio
->io_cksum_report
!= NULL
) {
3105 zio_cksum_report_t
*zcr
= zio
->io_cksum_report
;
3106 zio
->io_cksum_report
= zcr
->zcr_next
;
3107 zcr
->zcr_next
= NULL
;
3108 zcr
->zcr_finish(zcr
, NULL
);
3109 zfs_ereport_free_checksum(zcr
);
3112 if (zio
->io_flags
& ZIO_FLAG_FASTWRITE
&& zio
->io_bp
&&
3113 !BP_IS_HOLE(zio
->io_bp
)) {
3114 metaslab_fastwrite_unmark(zio
->io_spa
, zio
->io_bp
);
3118 * It is the responsibility of the done callback to ensure that this
3119 * particular zio is no longer discoverable for adoption, and as
3120 * such, cannot acquire any new parents.
3125 mutex_enter(&zio
->io_lock
);
3126 zio
->io_state
[ZIO_WAIT_DONE
] = 1;
3127 mutex_exit(&zio
->io_lock
);
3129 for (pio
= zio_walk_parents(zio
); pio
!= NULL
; pio
= pio_next
) {
3130 zio_link_t
*zl
= zio
->io_walk_link
;
3131 pio_next
= zio_walk_parents(zio
);
3132 zio_remove_child(pio
, zio
, zl
);
3133 zio_notify_parent(pio
, zio
, ZIO_WAIT_DONE
);
3136 if (zio
->io_waiter
!= NULL
) {
3137 mutex_enter(&zio
->io_lock
);
3138 zio
->io_executor
= NULL
;
3139 cv_broadcast(&zio
->io_cv
);
3140 mutex_exit(&zio
->io_lock
);
3145 return (ZIO_PIPELINE_STOP
);
3149 * ==========================================================================
3150 * I/O pipeline definition
3151 * ==========================================================================
3153 static zio_pipe_stage_t
*zio_pipeline
[] = {
3159 zio_checksum_generate
,
3173 zio_checksum_verify
,
3177 /* dnp is the dnode for zb1->zb_object */
3179 zbookmark_is_before(const dnode_phys_t
*dnp
, const zbookmark_t
*zb1
,
3180 const zbookmark_t
*zb2
)
3182 uint64_t zb1nextL0
, zb2thisobj
;
3184 ASSERT(zb1
->zb_objset
== zb2
->zb_objset
);
3185 ASSERT(zb2
->zb_level
== 0);
3188 * A bookmark in the deadlist is considered to be after
3191 if (zb2
->zb_object
== DMU_DEADLIST_OBJECT
)
3194 /* The objset_phys_t isn't before anything. */
3198 zb1nextL0
= (zb1
->zb_blkid
+ 1) <<
3199 ((zb1
->zb_level
) * (dnp
->dn_indblkshift
- SPA_BLKPTRSHIFT
));
3201 zb2thisobj
= zb2
->zb_object
? zb2
->zb_object
:
3202 zb2
->zb_blkid
<< (DNODE_BLOCK_SHIFT
- DNODE_SHIFT
);
3204 if (zb1
->zb_object
== DMU_META_DNODE_OBJECT
) {
3205 uint64_t nextobj
= zb1nextL0
*
3206 (dnp
->dn_datablkszsec
<< SPA_MINBLOCKSHIFT
) >> DNODE_SHIFT
;
3207 return (nextobj
<= zb2thisobj
);
3210 if (zb1
->zb_object
< zb2thisobj
)
3212 if (zb1
->zb_object
> zb2thisobj
)
3214 if (zb2
->zb_object
== DMU_META_DNODE_OBJECT
)
3216 return (zb1nextL0
<= zb2
->zb_blkid
);
3219 #if defined(_KERNEL) && defined(HAVE_SPL)
3220 /* Fault injection */
3221 EXPORT_SYMBOL(zio_injection_enabled
);
3222 EXPORT_SYMBOL(zio_inject_fault
);
3223 EXPORT_SYMBOL(zio_inject_list_next
);
3224 EXPORT_SYMBOL(zio_clear_fault
);
3225 EXPORT_SYMBOL(zio_handle_fault_injection
);
3226 EXPORT_SYMBOL(zio_handle_device_injection
);
3227 EXPORT_SYMBOL(zio_handle_label_injection
);
3228 EXPORT_SYMBOL(zio_priority_table
);
3229 EXPORT_SYMBOL(zio_type_name
);
3231 module_param(zio_bulk_flags
, int, 0644);
3232 MODULE_PARM_DESC(zio_bulk_flags
, "Additional flags to pass to bulk buffers");
3234 module_param(zio_delay_max
, int, 0644);
3235 MODULE_PARM_DESC(zio_delay_max
, "Max zio millisec delay before posting event");
3237 module_param(zio_requeue_io_start_cut_in_line
, int, 0644);
3238 MODULE_PARM_DESC(zio_requeue_io_start_cut_in_line
, "Prioritize requeued I/O");
3240 module_param(zfs_sync_pass_deferred_free
, int, 0644);
3241 MODULE_PARM_DESC(zfs_sync_pass_deferred_free
,
3242 "defer frees starting in this pass");
3244 module_param(zfs_sync_pass_dont_compress
, int, 0644);
3245 MODULE_PARM_DESC(zfs_sync_pass_dont_compress
,
3246 "don't compress starting in this pass");
3248 module_param(zfs_sync_pass_rewrite
, int, 0644);
3249 MODULE_PARM_DESC(zfs_sync_pass_rewrite
,
3250 "rewrite new bps starting in this pass");