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]
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
26 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
27 * Copyright 2016 Toomas Soome <tsoome@me.com>
33 #include <sys/zio_priority.h>
34 #include <sys/zfs_context.h>
38 #include <sys/kstat.h>
39 #include <sys/fs/zfs.h>
40 #include <sys/zio_impl.h>
49 #define ZEC_MAGIC 0x210da7ab10c7a11ULL
51 typedef struct zio_eck {
52 uint64_t zec_magic; /* for validation, endianness */
53 zio_cksum_t zec_cksum; /* 256-bit checksum */
57 * Gang block headers are self-checksumming and contain an array
60 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE
61 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \
62 sizeof (zio_eck_t)) / sizeof (blkptr_t))
63 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \
64 sizeof (zio_eck_t) - \
65 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
68 typedef struct zio_gbh {
69 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS];
70 uint64_t zg_filler[SPA_GBH_FILLER];
75 ZIO_CHECKSUM_INHERIT = 0,
79 ZIO_CHECKSUM_GANG_HEADER,
81 ZIO_CHECKSUM_FLETCHER_2,
82 ZIO_CHECKSUM_FLETCHER_4,
85 ZIO_CHECKSUM_NOPARITY,
91 ZIO_CHECKSUM_FUNCTIONS
95 * The number of "legacy" compression functions which can be set on individual
98 #define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2
100 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4
101 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON
103 #define ZIO_CHECKSUM_MASK 0xffULL
104 #define ZIO_CHECKSUM_VERIFY (1 << 8)
106 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256
107 #define ZIO_DEDUPDITTO_MIN 100
110 * The number of "legacy" compression functions which can be set on individual
113 #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4
116 * The meaning of "compress = on" selected by the compression features enabled
119 #define ZIO_COMPRESS_LEGACY_ON_VALUE ZIO_COMPRESS_LZJB
120 #define ZIO_COMPRESS_LZ4_ON_VALUE ZIO_COMPRESS_LZ4
122 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF
124 #define BOOTFS_COMPRESS_VALID(compress) \
125 ((compress) == ZIO_COMPRESS_LZJB || \
126 (compress) == ZIO_COMPRESS_LZ4 || \
127 (compress) == ZIO_COMPRESS_ON || \
128 (compress) == ZIO_COMPRESS_OFF)
130 #define ZIO_FAILURE_MODE_WAIT 0
131 #define ZIO_FAILURE_MODE_CONTINUE 1
132 #define ZIO_FAILURE_MODE_PANIC 2
134 typedef enum zio_suspend_reason {
135 ZIO_SUSPEND_NONE = 0,
138 } zio_suspend_reason_t;
142 * Flags inherited by gang, ddt, and vdev children,
143 * and that must be equal for two zios to aggregate
145 ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
146 ZIO_FLAG_IO_REPAIR = 1 << 1,
147 ZIO_FLAG_SELF_HEAL = 1 << 2,
148 ZIO_FLAG_RESILVER = 1 << 3,
149 ZIO_FLAG_SCRUB = 1 << 4,
150 ZIO_FLAG_SCAN_THREAD = 1 << 5,
151 ZIO_FLAG_PHYSICAL = 1 << 6,
153 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
156 * Flags inherited by ddt, gang, and vdev children.
158 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */
159 ZIO_FLAG_SPECULATIVE = 1 << 8,
160 ZIO_FLAG_CONFIG_WRITER = 1 << 9,
161 ZIO_FLAG_DONT_RETRY = 1 << 10,
162 ZIO_FLAG_DONT_CACHE = 1 << 11,
163 ZIO_FLAG_NODATA = 1 << 12,
164 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13,
165 ZIO_FLAG_IO_ALLOCATING = 1 << 14,
167 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
168 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)
171 * Flags inherited by vdev children.
173 ZIO_FLAG_IO_RETRY = 1 << 15, /* must be first for INHERIT */
174 ZIO_FLAG_PROBE = 1 << 16,
175 ZIO_FLAG_TRYHARD = 1 << 17,
176 ZIO_FLAG_OPTIONAL = 1 << 18,
178 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
181 * Flags not inherited by any children.
183 ZIO_FLAG_DONT_QUEUE = 1 << 19, /* must be first for INHERIT */
184 ZIO_FLAG_DONT_PROPAGATE = 1 << 20,
185 ZIO_FLAG_IO_BYPASS = 1 << 21,
186 ZIO_FLAG_IO_REWRITE = 1 << 22,
187 ZIO_FLAG_RAW = 1 << 23,
188 ZIO_FLAG_GANG_CHILD = 1 << 24,
189 ZIO_FLAG_DDT_CHILD = 1 << 25,
190 ZIO_FLAG_GODFATHER = 1 << 26,
191 ZIO_FLAG_NOPWRITE = 1 << 27,
192 ZIO_FLAG_REEXECUTED = 1 << 28,
193 ZIO_FLAG_DELEGATED = 1 << 29,
196 #define ZIO_FLAG_MUSTSUCCEED 0
198 #define ZIO_DDT_CHILD_FLAGS(zio) \
199 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \
200 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
202 #define ZIO_GANG_CHILD_FLAGS(zio) \
203 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \
204 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
206 #define ZIO_VDEV_CHILD_FLAGS(zio) \
207 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \
208 ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_CANFAIL)
210 #define ZIO_CHILD_BIT(x) (1 << (x))
211 #define ZIO_CHILD_BIT_IS_SET(val, x) ((val) & (1 << (x)))
221 #define ZIO_CHILD_VDEV_BIT ZIO_CHILD_BIT(ZIO_CHILD_VDEV)
222 #define ZIO_CHILD_GANG_BIT ZIO_CHILD_BIT(ZIO_CHILD_GANG)
223 #define ZIO_CHILD_DDT_BIT ZIO_CHILD_BIT(ZIO_CHILD_DDT)
224 #define ZIO_CHILD_LOGICAL_BIT ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL)
225 #define ZIO_CHILD_ALL_BITS \
226 (ZIO_CHILD_VDEV_BIT | ZIO_CHILD_GANG_BIT | \
227 ZIO_CHILD_DDT_BIT | ZIO_CHILD_LOGICAL_BIT)
236 * These are bespoke errnos used in ZFS. We map them to their closest FreeBSD
237 * equivalents. This gives us more useful error messages from strerror(3).
239 #define ECKSUM EINTEGRITY
240 #define EFRAGS ENOSPC
242 typedef void zio_done_func_t(zio_t *zio);
244 extern boolean_t zio_dva_throttle_enabled;
245 extern const char *zio_type_name[ZIO_TYPES];
248 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
249 * identifies any block in the pool. By convention, the meta-objset (MOS)
250 * is objset 0, and the meta-dnode is object 0. This covers all blocks
251 * except root blocks and ZIL blocks, which are defined as follows:
253 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
254 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
255 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
256 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>.
258 * Note: this structure is called a bookmark because its original purpose
259 * was to remember where to resume a pool-wide traverse.
261 * Note: this structure is passed between userland and the kernel, and is
262 * stored on disk (by virtue of being incorporated into other on-disk
263 * structures, e.g. dsl_scan_phys_t).
265 typedef struct zbookmark_phys {
272 #define SET_BOOKMARK(zb, objset, object, level, blkid) \
274 (zb)->zb_objset = objset; \
275 (zb)->zb_object = object; \
276 (zb)->zb_level = level; \
277 (zb)->zb_blkid = blkid; \
280 #define ZB_DESTROYED_OBJSET (-1ULL)
282 #define ZB_ROOT_OBJECT (0ULL)
283 #define ZB_ROOT_LEVEL (-1LL)
284 #define ZB_ROOT_BLKID (0ULL)
286 #define ZB_ZIL_OBJECT (0ULL)
287 #define ZB_ZIL_LEVEL (-2LL)
289 #define ZB_DNODE_LEVEL (-3LL)
290 #define ZB_DNODE_BLKID (0ULL)
292 #define ZB_IS_ZERO(zb) \
293 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \
294 (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
295 #define ZB_IS_ROOT(zb) \
296 ((zb)->zb_object == ZB_ROOT_OBJECT && \
297 (zb)->zb_level == ZB_ROOT_LEVEL && \
298 (zb)->zb_blkid == ZB_ROOT_BLKID)
300 typedef struct zio_prop {
301 enum zio_checksum zp_checksum;
302 enum zio_compress zp_compress;
303 dmu_object_type_t zp_type;
307 boolean_t zp_dedup_verify;
308 boolean_t zp_nopwrite;
309 uint32_t zp_zpl_smallblk;
312 typedef struct zio_cksum_report zio_cksum_report_t;
314 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
315 const void *good_data);
316 typedef void zio_cksum_free_f(void *cbdata, size_t size);
318 struct zio_bad_cksum; /* defined in zio_checksum.h */
322 struct zio_cksum_report {
323 struct zio_cksum_report *zcr_next;
324 nvlist_t *zcr_ereport;
325 nvlist_t *zcr_detector;
327 size_t zcr_cbinfo; /* passed to zcr_free() */
330 zio_cksum_finish_f *zcr_finish;
331 zio_cksum_free_f *zcr_free;
333 /* internal use only */
334 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */
337 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
340 zio_vsd_cksum_report_f zio_vsd_default_cksum_report;
342 typedef struct zio_vsd_ops {
343 zio_done_func_t *vsd_free;
344 zio_vsd_cksum_report_f *vsd_cksum_report;
347 typedef struct zio_gang_node {
348 zio_gbh_phys_t *gn_gbh;
349 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
352 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
353 zio_gang_node_t *gn, struct abd *data, uint64_t offset);
355 typedef void zio_transform_func_t(zio_t *zio, struct abd *data, uint64_t size);
357 typedef struct zio_transform {
358 struct abd *zt_orig_abd;
359 uint64_t zt_orig_size;
361 zio_transform_func_t *zt_transform;
362 struct zio_transform *zt_next;
365 typedef zio_t *zio_pipe_stage_t(zio_t *zio);
368 * The io_reexecute flags are distinct from io_flags because the child must
369 * be able to propagate them to the parent. The normal io_flags are local
370 * to the zio, not protected by any lock, and not modifiable by children;
371 * the reexecute flags are protected by io_lock, modifiable by children,
372 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
374 #define ZIO_REEXECUTE_NOW 0x01
375 #define ZIO_REEXECUTE_SUSPEND 0x02
377 typedef struct zio_alloc_list {
382 typedef struct zio_link {
385 list_node_t zl_parent_node;
386 list_node_t zl_child_node;
390 * Used for TRIM kstat.
392 typedef struct zio_trim_stats {
394 * Number of bytes successfully TRIMmed.
399 * Number of successful TRIM requests.
401 kstat_named_t success;
404 * Number of TRIM requests that failed because TRIM is not
407 kstat_named_t unsupported;
410 * Number of TRIM requests that failed for other reasons.
412 kstat_named_t failed;
415 extern zio_trim_stats_t zio_trim_stats;
417 #define ZIO_TRIM_STAT_INCR(stat, val) \
418 atomic_add_64(&zio_trim_stats.stat.value.ui64, (val));
419 #define ZIO_TRIM_STAT_BUMP(stat) \
420 ZIO_TRIM_STAT_INCR(stat, 1);
423 /* Core information about this I/O */
424 zbookmark_phys_t io_bookmark;
427 enum zio_child io_child_type;
429 zio_priority_t io_priority;
430 uint8_t io_reexecute;
431 uint8_t io_state[ZIO_WAIT_TYPES];
435 blkptr_t *io_bp_override;
437 list_t io_parent_list;
438 list_t io_child_list;
440 zio_transform_t *io_transform_stack;
443 zio_done_func_t *io_ready;
444 zio_done_func_t *io_children_ready;
445 zio_done_func_t *io_physdone;
446 zio_done_func_t *io_done;
448 int64_t io_prev_space_delta; /* DMU private */
451 /* Data represented by this I/O */
453 struct abd *io_orig_abd;
455 uint64_t io_orig_size;
456 /* io_lsize != io_orig_size iff this is a raw write */
459 /* Stuff for the vdev stack */
462 const zio_vsd_ops_t *io_vsd_ops;
463 metaslab_class_t *io_metaslab_class; /* dva throttle class */
466 hrtime_t io_timestamp;
467 hrtime_t io_queued_timestamp;
468 hrtime_t io_target_timestamp;
469 avl_node_t io_queue_node;
470 avl_node_t io_offset_node;
471 avl_node_t io_alloc_node;
472 zio_alloc_list_t io_alloc_list;
478 /* Internal pipeline state */
479 enum zio_flag io_flags;
480 enum zio_stage io_stage;
481 enum zio_stage io_pipeline;
482 enum zio_flag io_orig_flags;
483 enum zio_stage io_orig_stage;
484 enum zio_stage io_orig_pipeline;
485 enum zio_stage io_pipeline_trace;
487 int io_child_error[ZIO_CHILD_TYPES];
488 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
489 uint64_t io_child_count;
490 uint64_t io_phys_children;
491 uint64_t io_parent_count;
493 zio_t *io_gang_leader;
494 zio_gang_node_t *io_gang_tree;
502 zio_cksum_report_t *io_cksum_report;
505 /* Taskq dispatching state */
506 taskq_ent_t io_tqent;
508 avl_node_t io_trim_node;
509 list_node_t io_trim_link;
512 extern int zio_bookmark_compare(const void *, const void *);
514 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
515 zio_done_func_t *done, void *priv, enum zio_flag flags);
517 extern zio_t *zio_root(spa_t *spa,
518 zio_done_func_t *done, void *priv, enum zio_flag flags);
520 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
521 struct abd *data, uint64_t lsize, zio_done_func_t *done, void *priv,
522 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);
524 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
525 struct abd *data, uint64_t size, uint64_t psize, const zio_prop_t *zp,
526 zio_done_func_t *ready, zio_done_func_t *children_ready,
527 zio_done_func_t *physdone, zio_done_func_t *done,
528 void *priv, zio_priority_t priority, enum zio_flag flags,
529 const zbookmark_phys_t *zb);
531 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
532 struct abd *data, uint64_t size, zio_done_func_t *done, void *priv,
533 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb);
535 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
538 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
540 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
542 zio_done_func_t *done, void *priv, enum zio_flag flags);
544 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
545 uint64_t offset, uint64_t size, zio_done_func_t *done, void *priv,
546 zio_priority_t priority, enum zio_flag flags);
548 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
549 uint64_t size, struct abd *data, int checksum,
550 zio_done_func_t *done, void *priv, zio_priority_t priority,
551 enum zio_flag flags, boolean_t labels);
553 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
554 uint64_t size, struct abd *data, int checksum,
555 zio_done_func_t *done, void *priv, zio_priority_t priority,
556 enum zio_flag flags, boolean_t labels);
558 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
559 const blkptr_t *bp, uint64_t size, enum zio_flag flags);
561 extern int zio_alloc_zil(spa_t *spa, uint64_t objset, uint64_t txg,
562 blkptr_t *new_bp, blkptr_t *old_bp, uint64_t size, boolean_t *slog);
563 extern void zio_flush(zio_t *zio, vdev_t *vd);
564 extern zio_t *zio_trim(zio_t *zio, spa_t *spa, vdev_t *vd, uint64_t offset,
566 extern void zio_shrink(zio_t *zio, uint64_t size);
568 extern int zio_wait(zio_t *zio);
569 extern void zio_nowait(zio_t *zio);
570 extern void zio_execute(zio_t *zio);
571 extern void zio_interrupt(zio_t *zio);
572 extern void zio_delay_init(zio_t *zio);
573 extern void zio_delay_interrupt(zio_t *zio);
575 extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **);
576 extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **);
577 extern zio_t *zio_unique_parent(zio_t *cio);
578 extern void zio_add_child(zio_t *pio, zio_t *cio);
580 extern void *zio_buf_alloc(size_t size);
581 extern void zio_buf_free(void *buf, size_t size);
582 extern void *zio_data_buf_alloc(size_t size);
583 extern void zio_data_buf_free(void *buf, size_t size);
585 extern void zio_push_transform(zio_t *zio, struct abd *abd, uint64_t size,
586 uint64_t bufsize, zio_transform_func_t *transform);
587 extern void zio_pop_transforms(zio_t *zio);
589 extern void zio_resubmit_stage_async(void *);
591 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
592 uint64_t offset, struct abd *data, uint64_t size, int type,
593 zio_priority_t priority, enum zio_flag flags,
594 zio_done_func_t *done, void *priv);
596 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
597 struct abd *data, uint64_t size, zio_type_t type, zio_priority_t priority,
598 enum zio_flag flags, zio_done_func_t *done, void *priv);
600 extern void zio_vdev_io_bypass(zio_t *zio);
601 extern void zio_vdev_io_reissue(zio_t *zio);
602 extern void zio_vdev_io_redone(zio_t *zio);
604 extern void zio_change_priority(zio_t *pio, zio_priority_t priority);
606 extern void zio_checksum_verified(zio_t *zio);
607 extern int zio_worst_error(int e1, int e2);
609 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
610 enum zio_checksum parent);
611 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
612 enum zio_checksum child, enum zio_checksum parent);
613 extern enum zio_compress zio_compress_select(spa_t *spa,
614 enum zio_compress child, enum zio_compress parent);
616 extern void zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t);
617 extern int zio_resume(spa_t *spa);
618 extern void zio_resume_wait(spa_t *spa);
621 * Initial setup and teardown.
623 extern void zio_init(void);
624 extern void zio_fini(void);
629 struct zinject_record;
630 extern uint32_t zio_injection_enabled;
631 extern int zio_inject_fault(char *name, int flags, int *id,
632 struct zinject_record *record);
633 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
634 struct zinject_record *record);
635 extern int zio_clear_fault(int id);
636 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
637 extern int zio_handle_fault_injection(zio_t *zio, int error);
638 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
639 extern int zio_handle_label_injection(zio_t *zio, int error);
640 extern void zio_handle_ignored_writes(zio_t *zio);
641 extern hrtime_t zio_handle_io_delay(zio_t *zio);
644 * Checksum ereport functions
646 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
647 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
648 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
649 const void *good_data, const void *bad_data, boolean_t drop_if_identical);
651 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
652 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
654 /* If we have the good data in hand, this function can be used */
655 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
656 struct zio *zio, uint64_t offset, uint64_t length,
657 const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
659 /* Called from spa_sync(), but primarily an injection handler */
660 extern void spa_handle_ignored_writes(spa_t *spa);
662 /* zbookmark_phys functions */
663 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp,
664 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block);
665 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2,
666 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2);