1/*
2 * CDDL HEADER START
3 *
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.
7 *
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.
12 *
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]
18 *
19 * CDDL HEADER END
20 */
21
22/*
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, 2016 by Delphix. All rights reserved.
26 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
27 * Copyright 2016 Toomas Soome <tsoome@me.com>
28 */
29
30#ifndef _ZIO_H
31#define _ZIO_H
32
33#include <sys/zio_priority.h>
34#include <sys/zfs_context.h>
35#include <sys/spa.h>
36#include <sys/txg.h>
37#include <sys/avl.h>
38#include <sys/kstat.h>
39#include <sys/fs/zfs.h>
40#include <sys/zio_impl.h>
41
42#ifdef __cplusplus
43extern "C" {
44#endif
45
46/*
47 * Embedded checksum
48 */
49#define ZEC_MAGIC 0x210da7ab10c7a11ULL
50
51typedef struct zio_eck {
52 uint64_t zec_magic; /* for validation, endianness */
53 zio_cksum_t zec_cksum; /* 256-bit checksum */
54} zio_eck_t;
55
56/*
57 * Gang block headers are self-checksumming and contain an array
58 * of block pointers.
59 */
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))) /\
66 sizeof (uint64_t))
67
68typedef struct zio_gbh {
69 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS];
70 uint64_t zg_filler[SPA_GBH_FILLER];
71 zio_eck_t zg_tail;
72} zio_gbh_phys_t;
73
74enum zio_checksum {
75 ZIO_CHECKSUM_INHERIT = 0,
76 ZIO_CHECKSUM_ON,
77 ZIO_CHECKSUM_OFF,
78 ZIO_CHECKSUM_LABEL,
79 ZIO_CHECKSUM_GANG_HEADER,
80 ZIO_CHECKSUM_ZILOG,
81 ZIO_CHECKSUM_FLETCHER_2,
82 ZIO_CHECKSUM_FLETCHER_4,
83 ZIO_CHECKSUM_SHA256,
84 ZIO_CHECKSUM_ZILOG2,
85 ZIO_CHECKSUM_NOPARITY,
86#ifndef __NetBSD__
87 ZIO_CHECKSUM_SHA512,
88 ZIO_CHECKSUM_SKEIN,
89#endif
90#ifdef illumos
91 ZIO_CHECKSUM_EDONR,
92#endif
93 ZIO_CHECKSUM_FUNCTIONS
94};
95
96/*
97 * The number of "legacy" compression functions which can be set on individual
98 * objects.
99 */
100#define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2
101
102#define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4
103#define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON
104
105#define ZIO_CHECKSUM_MASK 0xffULL
106#define ZIO_CHECKSUM_VERIFY (1 << 8)
107
108#define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256
109#define ZIO_DEDUPDITTO_MIN 100
110
111enum zio_compress {
112 ZIO_COMPRESS_INHERIT = 0,
113 ZIO_COMPRESS_ON,
114 ZIO_COMPRESS_OFF,
115 ZIO_COMPRESS_LZJB,
116 ZIO_COMPRESS_EMPTY,
117 ZIO_COMPRESS_GZIP_1,
118 ZIO_COMPRESS_GZIP_2,
119 ZIO_COMPRESS_GZIP_3,
120 ZIO_COMPRESS_GZIP_4,
121 ZIO_COMPRESS_GZIP_5,
122 ZIO_COMPRESS_GZIP_6,
123 ZIO_COMPRESS_GZIP_7,
124 ZIO_COMPRESS_GZIP_8,
125 ZIO_COMPRESS_GZIP_9,
126 ZIO_COMPRESS_ZLE,
127 ZIO_COMPRESS_LZ4,
128 ZIO_COMPRESS_FUNCTIONS
129};
130
131/*
132 * The number of "legacy" compression functions which can be set on individual
133 * objects.
134 */
135#define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4
136
137/*
138 * The meaning of "compress = on" selected by the compression features enabled
139 * on a given pool.
140 */
141#define ZIO_COMPRESS_LEGACY_ON_VALUE ZIO_COMPRESS_LZJB
142#define ZIO_COMPRESS_LZ4_ON_VALUE ZIO_COMPRESS_LZ4
143
144#define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF
145
146#define BOOTFS_COMPRESS_VALID(compress) \
147 ((compress) == ZIO_COMPRESS_LZJB || \
148 (compress) == ZIO_COMPRESS_LZ4 || \
149 (compress) == ZIO_COMPRESS_ON || \
150 (compress) == ZIO_COMPRESS_OFF)
151
152#define ZIO_FAILURE_MODE_WAIT 0
153#define ZIO_FAILURE_MODE_CONTINUE 1
154#define ZIO_FAILURE_MODE_PANIC 2
155
156enum zio_flag {
157 /*
158 * Flags inherited by gang, ddt, and vdev children,
159 * and that must be equal for two zios to aggregate
160 */
161 ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
162 ZIO_FLAG_IO_REPAIR = 1 << 1,
163 ZIO_FLAG_SELF_HEAL = 1 << 2,
164 ZIO_FLAG_RESILVER = 1 << 3,
165 ZIO_FLAG_SCRUB = 1 << 4,
166 ZIO_FLAG_SCAN_THREAD = 1 << 5,
167 ZIO_FLAG_PHYSICAL = 1 << 6,
168
169#define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
170
171 /*
172 * Flags inherited by ddt, gang, and vdev children.
173 */
174 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */
175 ZIO_FLAG_SPECULATIVE = 1 << 8,
176 ZIO_FLAG_CONFIG_WRITER = 1 << 9,
177 ZIO_FLAG_DONT_RETRY = 1 << 10,
178 ZIO_FLAG_DONT_CACHE = 1 << 11,
179 ZIO_FLAG_NODATA = 1 << 12,
180 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13,
181 ZIO_FLAG_IO_ALLOCATING = 1 << 14,
182
183#define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
184#define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)
185
186 /*
187 * Flags inherited by vdev children.
188 */
189 ZIO_FLAG_IO_RETRY = 1 << 15, /* must be first for INHERIT */
190 ZIO_FLAG_PROBE = 1 << 16,
191 ZIO_FLAG_TRYHARD = 1 << 17,
192 ZIO_FLAG_OPTIONAL = 1 << 18,
193
194#define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
195
196 /*
197 * Flags not inherited by any children.
198 */
199 ZIO_FLAG_DONT_QUEUE = 1 << 19, /* must be first for INHERIT */
200 ZIO_FLAG_DONT_PROPAGATE = 1 << 20,
201 ZIO_FLAG_IO_BYPASS = 1 << 21,
202 ZIO_FLAG_IO_REWRITE = 1 << 22,
203 ZIO_FLAG_RAW = 1 << 23,
204 ZIO_FLAG_GANG_CHILD = 1 << 24,
205 ZIO_FLAG_DDT_CHILD = 1 << 25,
206 ZIO_FLAG_GODFATHER = 1 << 26,
207 ZIO_FLAG_NOPWRITE = 1 << 27,
208 ZIO_FLAG_REEXECUTED = 1 << 28,
209 ZIO_FLAG_DELEGATED = 1 << 29,
210};
211
212#define ZIO_FLAG_MUSTSUCCEED 0
213
214#define ZIO_DDT_CHILD_FLAGS(zio) \
215 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \
216 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
217
218#define ZIO_GANG_CHILD_FLAGS(zio) \
219 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \
220 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
221
222#define ZIO_VDEV_CHILD_FLAGS(zio) \
223 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \
224 ZIO_FLAG_CANFAIL)
225
226enum zio_child {
227 ZIO_CHILD_VDEV = 0,
228 ZIO_CHILD_GANG,
229 ZIO_CHILD_DDT,
230 ZIO_CHILD_LOGICAL,
231 ZIO_CHILD_TYPES
232};
233
234enum zio_wait_type {
235 ZIO_WAIT_READY = 0,
236 ZIO_WAIT_DONE,
237 ZIO_WAIT_TYPES
238};
239
240/*
241 * We'll take the number 122 and 123 to indicate checksum errors and
242 * fragmentation. Those doesn't collide with any errno values as they
243 * are greater than ELAST.
244 */
245#define ECKSUM 122
246#define EFRAGS 123
247
248typedef void zio_done_func_t(zio_t *zio);
249
250extern boolean_t zio_dva_throttle_enabled;
251extern const char *zio_type_name[ZIO_TYPES];
252
253/*
254 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
255 * identifies any block in the pool. By convention, the meta-objset (MOS)
256 * is objset 0, and the meta-dnode is object 0. This covers all blocks
257 * except root blocks and ZIL blocks, which are defined as follows:
258 *
259 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
260 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
261 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
262 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>.
263 *
264 * Note: this structure is called a bookmark because its original purpose
265 * was to remember where to resume a pool-wide traverse.
266 *
267 * Note: this structure is passed between userland and the kernel, and is
268 * stored on disk (by virtue of being incorporated into other on-disk
269 * structures, e.g. dsl_scan_phys_t).
270 */
271typedef struct zbookmark_phys {
272 uint64_t zb_objset;
273 uint64_t zb_object;
274 int64_t zb_level;
275 uint64_t zb_blkid;
276} zbookmark_phys_t;
277
278#define SET_BOOKMARK(zb, objset, object, level, blkid) \
279{ \
280 (zb)->zb_objset = objset; \
281 (zb)->zb_object = object; \
282 (zb)->zb_level = level; \
283 (zb)->zb_blkid = blkid; \
284}
285
286#define ZB_DESTROYED_OBJSET (-1ULL)
287
288#define ZB_ROOT_OBJECT (0ULL)
289#define ZB_ROOT_LEVEL (-1LL)
290#define ZB_ROOT_BLKID (0ULL)
291
292#define ZB_ZIL_OBJECT (0ULL)
293#define ZB_ZIL_LEVEL (-2LL)
294
295#define ZB_DNODE_LEVEL (-3LL)
296#define ZB_DNODE_BLKID (0ULL)
297
298#define ZB_IS_ZERO(zb) \
299 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \
300 (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
301#define ZB_IS_ROOT(zb) \
302 ((zb)->zb_object == ZB_ROOT_OBJECT && \
303 (zb)->zb_level == ZB_ROOT_LEVEL && \
304 (zb)->zb_blkid == ZB_ROOT_BLKID)
305
306typedef struct zio_prop {
307 enum zio_checksum zp_checksum;
308 enum zio_compress zp_compress;
309 dmu_object_type_t zp_type;
310 uint8_t zp_level;
311 uint8_t zp_copies;
312 boolean_t zp_dedup;
313 boolean_t zp_dedup_verify;
314 boolean_t zp_nopwrite;
315} zio_prop_t;
316
317typedef struct zio_cksum_report zio_cksum_report_t;
318
319typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
320 const void *good_data);
321typedef void zio_cksum_free_f(void *cbdata, size_t size);
322
323struct zio_bad_cksum; /* defined in zio_checksum.h */
324struct dnode_phys;
325
326struct zio_cksum_report {
327 struct zio_cksum_report *zcr_next;
328 nvlist_t *zcr_ereport;
329 nvlist_t *zcr_detector;
330 void *zcr_cbdata;
331 size_t zcr_cbinfo; /* passed to zcr_free() */
332 uint64_t zcr_align;
333 uint64_t zcr_length;
334 zio_cksum_finish_f *zcr_finish;
335 zio_cksum_free_f *zcr_free;
336
337 /* internal use only */
338 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */
339};
340
341typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
342 void *arg);
343
344zio_vsd_cksum_report_f zio_vsd_default_cksum_report;
345
346typedef struct zio_vsd_ops {
347 zio_done_func_t *vsd_free;
348 zio_vsd_cksum_report_f *vsd_cksum_report;
349} zio_vsd_ops_t;
350
351typedef struct zio_gang_node {
352 zio_gbh_phys_t *gn_gbh;
353 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
354} zio_gang_node_t;
355
356typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
357 zio_gang_node_t *gn, void *data);
358
359typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
360
361typedef struct zio_transform {
362 void *zt_orig_data;
363 uint64_t zt_orig_size;
364 uint64_t zt_bufsize;
365 zio_transform_func_t *zt_transform;
366 struct zio_transform *zt_next;
367} zio_transform_t;
368
369typedef int zio_pipe_stage_t(zio_t *zio);
370
371/*
372 * The io_reexecute flags are distinct from io_flags because the child must
373 * be able to propagate them to the parent. The normal io_flags are local
374 * to the zio, not protected by any lock, and not modifiable by children;
375 * the reexecute flags are protected by io_lock, modifiable by children,
376 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
377 */
378#define ZIO_REEXECUTE_NOW 0x01
379#define ZIO_REEXECUTE_SUSPEND 0x02
380
381typedef struct zio_alloc_list {
382 list_t zal_list;
383 uint64_t zal_size;
384} zio_alloc_list_t;
385
386typedef struct zio_link {
387 zio_t *zl_parent;
388 zio_t *zl_child;
389 list_node_t zl_parent_node;
390 list_node_t zl_child_node;
391} zio_link_t;
392
393/*
394 * Used for TRIM kstat.
395 */
396typedef struct zio_trim_stats {
397 /*
398 * Number of bytes successfully TRIMmed.
399 */
400 kstat_named_t bytes;
401
402 /*
403 * Number of successful TRIM requests.
404 */
405 kstat_named_t success;
406
407 /*
408 * Number of TRIM requests that failed because TRIM is not
409 * supported.
410 */
411 kstat_named_t unsupported;
412
413 /*
414 * Number of TRIM requests that failed for other reasons.
415 */
416 kstat_named_t failed;
417} zio_trim_stats_t;
418
419extern zio_trim_stats_t zio_trim_stats;
420
421#define ZIO_TRIM_STAT_INCR(stat, val) \
422 atomic_add_64(&zio_trim_stats.stat.value.ui64, (val));
423#define ZIO_TRIM_STAT_BUMP(stat) \
424 ZIO_TRIM_STAT_INCR(stat, 1);
425
426struct zio {
427 /* Core information about this I/O */
428 zbookmark_phys_t io_bookmark;
429 zio_prop_t io_prop;
430 zio_type_t io_type;
431 enum zio_child io_child_type;
432 int io_cmd;
433 zio_priority_t io_priority;
434 uint8_t io_reexecute;
435 uint8_t io_state[ZIO_WAIT_TYPES];
436 uint64_t io_txg;
437 spa_t *io_spa;
438 blkptr_t *io_bp;
439 blkptr_t *io_bp_override;
440 blkptr_t io_bp_copy;
441 list_t io_parent_list;
442 list_t io_child_list;
443 zio_t *io_logical;
444 zio_transform_t *io_transform_stack;
445
446 /* Callback info */
447 zio_done_func_t *io_ready;
448 zio_done_func_t *io_children_ready;
449 zio_done_func_t *io_physdone;
450 zio_done_func_t *io_done;
451 void *io_private;
452 int64_t io_prev_space_delta; /* DMU private */
453 blkptr_t io_bp_orig;
454
455 /* Data represented by this I/O */
456 void *io_data;
457 void *io_orig_data;
458 uint64_t io_size;
459 uint64_t io_orig_size;
460
461 /* Stuff for the vdev stack */
462 vdev_t *io_vd;
463 void *io_vsd;
464 const zio_vsd_ops_t *io_vsd_ops;
465
466 uint64_t io_offset;
467 hrtime_t io_timestamp;
468 hrtime_t io_queued_timestamp;
469 hrtime_t io_target_timestamp;
470 avl_node_t io_queue_node;
471 avl_node_t io_offset_node;
472 avl_node_t io_alloc_node;
473 zio_alloc_list_t io_alloc_list;
474
475 /* Internal pipeline state */
476 enum zio_flag io_flags;
477 enum zio_stage io_stage;
478 enum zio_stage io_pipeline;
479 enum zio_flag io_orig_flags;
480 enum zio_stage io_orig_stage;
481 enum zio_stage io_orig_pipeline;
482 enum zio_stage io_pipeline_trace;
483 int io_error;
484 int io_child_error[ZIO_CHILD_TYPES];
485 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
486 uint64_t io_child_count;
487 uint64_t io_phys_children;
488 uint64_t io_parent_count;
489 uint64_t *io_stall;
490 zio_t *io_gang_leader;
491 zio_gang_node_t *io_gang_tree;
492 void *io_executor;
493 void *io_waiter;
494 kmutex_t io_lock;
495 kcondvar_t io_cv;
496
497 /* FMA state */
498 zio_cksum_report_t *io_cksum_report;
499 uint64_t io_ena;
500
501 /* Taskq dispatching state */
502 taskq_ent_t io_tqent;
503
504 avl_node_t io_trim_node;
505 list_node_t io_trim_link;
506};
507
508extern int zio_timestamp_compare(const void *, const void *);
509
510extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
511 zio_done_func_t *done, void *priv, enum zio_flag flags);
512
513extern zio_t *zio_root(spa_t *spa,
514 zio_done_func_t *done, void *priv, enum zio_flag flags);
515
516extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
517 uint64_t size, zio_done_func_t *done, void *priv,
518 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);
519
520extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
521 void *data, uint64_t size, const zio_prop_t *zp,
522 zio_done_func_t *ready, zio_done_func_t *children_ready,
523 zio_done_func_t *physdone, zio_done_func_t *done,
524 void *priv, zio_priority_t priority, enum zio_flag flags,
525 const zbookmark_phys_t *zb);
526
527extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
528 void *data, uint64_t size, zio_done_func_t *done, void *priv,
529 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb);
530
531extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
532 boolean_t nopwrite);
533
534extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
535
536extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
537 const blkptr_t *bp,
538 zio_done_func_t *done, void *priv, enum zio_flag flags);
539
540extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
541 uint64_t offset, uint64_t size, zio_done_func_t *done, void *priv,
542 zio_priority_t priority, enum zio_flag flags);
543
544extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
545 uint64_t size, void *data, int checksum,
546 zio_done_func_t *done, void *priv, zio_priority_t priority,
547 enum zio_flag flags, boolean_t labels);
548
549extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
550 uint64_t size, void *data, int checksum,
551 zio_done_func_t *done, void *priv, zio_priority_t priority,
552 enum zio_flag flags, boolean_t labels);
553
554extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
555 const blkptr_t *bp, uint64_t size, enum zio_flag flags);
556
557extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
558 blkptr_t *old_bp, uint64_t size, boolean_t *slog);
559extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
560extern void zio_flush(zio_t *zio, vdev_t *vd);
561extern zio_t *zio_trim(zio_t *zio, spa_t *spa, vdev_t *vd, uint64_t offset,
562 uint64_t size);
563extern void zio_shrink(zio_t *zio, uint64_t size);
564
565extern int zio_wait(zio_t *zio);
566extern void zio_nowait(zio_t *zio);
567extern void zio_execute(zio_t *zio);
568extern void zio_interrupt(zio_t *zio);
569extern void zio_delay_init(zio_t *zio);
570extern void zio_delay_interrupt(zio_t *zio);
571
572extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **);
573extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **);
574extern zio_t *zio_unique_parent(zio_t *cio);
575extern void zio_add_child(zio_t *pio, zio_t *cio);
576
577extern void *zio_buf_alloc(size_t size);
578extern void *zio_buf_alloc_nowait(size_t size);
579extern void zio_buf_free(void *buf, size_t size);
580extern void *zio_data_buf_alloc(size_t size);
581extern void zio_data_buf_free(void *buf, size_t size);
582
583extern void zio_push_transform(zio_t *zio, void *data, uint64_t size,
584 uint64_t bufsize, zio_transform_func_t *transform);
585extern void zio_pop_transforms(zio_t *zio);
586
587extern void zio_resubmit_stage_async(void *);
588
589extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
590 uint64_t offset, void *data, uint64_t size, int type,
591 zio_priority_t priority, enum zio_flag flags,
592 zio_done_func_t *done, void *priv);
593
594extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
595 void *data, uint64_t size, int type, zio_priority_t priority,
596 enum zio_flag flags, zio_done_func_t *done, void *priv);
597
598extern void zio_vdev_io_bypass(zio_t *zio);
599extern void zio_vdev_io_reissue(zio_t *zio);
600extern void zio_vdev_io_redone(zio_t *zio);
601
602extern void zio_checksum_verified(zio_t *zio);
603extern int zio_worst_error(int e1, int e2);
604
605extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
606 enum zio_checksum parent);
607extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
608 enum zio_checksum child, enum zio_checksum parent);
609extern enum zio_compress zio_compress_select(spa_t *spa,
610 enum zio_compress child, enum zio_compress parent);
611
612extern void zio_suspend(spa_t *spa, zio_t *zio);
613extern int zio_resume(spa_t *spa);
614extern void zio_resume_wait(spa_t *spa);
615
616/*
617 * Initial setup and teardown.
618 */
619extern void zio_init(void);
620extern void zio_fini(void);
621
622/*
623 * Fault injection
624 */
625struct zinject_record;
626extern uint32_t zio_injection_enabled;
627extern int zio_inject_fault(char *name, int flags, int *id,
628 struct zinject_record *record);
629extern int zio_inject_list_next(int *id, char *name, size_t buflen,
630 struct zinject_record *record);
631extern int zio_clear_fault(int id);
632extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
633extern int zio_handle_fault_injection(zio_t *zio, int error);
634extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
635extern int zio_handle_label_injection(zio_t *zio, int error);
636extern void zio_handle_ignored_writes(zio_t *zio);
637extern hrtime_t zio_handle_io_delay(zio_t *zio);
638
639/*
640 * Checksum ereport functions
641 */
642extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
643 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
644extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
645 const void *good_data, const void *bad_data, boolean_t drop_if_identical);
646
647extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
648extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
649
650/* If we have the good data in hand, this function can be used */
651extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
652 struct zio *zio, uint64_t offset, uint64_t length,
653 const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
654
655/* Called from spa_sync(), but primarily an injection handler */
656extern void spa_handle_ignored_writes(spa_t *spa);
657
658/* zbookmark_phys functions */
659boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp,
660 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block);
661int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2,
662 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2);
663
664#ifdef __cplusplus
665}
666#endif
667
668#endif /* _ZIO_H */
669