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) 2013 by Delphix. All rights reserved.
26 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
27 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
28 */
29
30 #ifndef _ZIO_H
31 #define _ZIO_H
32
33 #include <sys/zfs_context.h>
34 #include <sys/spa.h>
35 #include <sys/txg.h>
36 #include <sys/avl.h>
37 #include <sys/fs/zfs.h>
38 #include <sys/zio_impl.h>
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 /*
45 * Embedded checksum
46 */
47 #define ZEC_MAGIC 0x210da7ab10c7a11ULL
48
49 typedef struct zio_eck {
50 uint64_t zec_magic; /* for validation, endianness */
51 zio_cksum_t zec_cksum; /* 256-bit checksum */
52 } zio_eck_t;
53
54 /*
55 * Gang block headers are self-checksumming and contain an array
56 * of block pointers.
57 */
58 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE
59 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \
60 sizeof (zio_eck_t)) / sizeof (blkptr_t))
61 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \
62 sizeof (zio_eck_t) - \
63 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
64 sizeof (uint64_t))
65
66 typedef struct zio_gbh {
67 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS];
68 uint64_t zg_filler[SPA_GBH_FILLER];
69 zio_eck_t zg_tail;
70 } zio_gbh_phys_t;
71
72 enum zio_checksum {
73 ZIO_CHECKSUM_INHERIT = 0,
74 ZIO_CHECKSUM_ON,
75 ZIO_CHECKSUM_OFF,
76 ZIO_CHECKSUM_LABEL,
77 ZIO_CHECKSUM_GANG_HEADER,
78 ZIO_CHECKSUM_ZILOG,
79 ZIO_CHECKSUM_FLETCHER_2,
80 ZIO_CHECKSUM_FLETCHER_4,
81 ZIO_CHECKSUM_SHA256,
82 ZIO_CHECKSUM_ZILOG2,
83 ZIO_CHECKSUM_NOPARITY,
84 ZIO_CHECKSUM_FUNCTIONS
85 };
86
87 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4
88 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON
89
90 #define ZIO_CHECKSUM_MASK 0xffULL
91 #define ZIO_CHECKSUM_VERIFY (1 << 8)
92
93 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256
94 #define ZIO_DEDUPDITTO_MIN 100
95
96 enum zio_compress {
97 ZIO_COMPRESS_INHERIT = 0,
98 ZIO_COMPRESS_ON,
99 ZIO_COMPRESS_OFF,
100 ZIO_COMPRESS_LZJB,
101 ZIO_COMPRESS_EMPTY,
102 ZIO_COMPRESS_GZIP_1,
103 ZIO_COMPRESS_GZIP_2,
104 ZIO_COMPRESS_GZIP_3,
105 ZIO_COMPRESS_GZIP_4,
106 ZIO_COMPRESS_GZIP_5,
107 ZIO_COMPRESS_GZIP_6,
108 ZIO_COMPRESS_GZIP_7,
109 ZIO_COMPRESS_GZIP_8,
110 ZIO_COMPRESS_GZIP_9,
111 ZIO_COMPRESS_ZLE,
112 ZIO_COMPRESS_LZ4,
113 ZIO_COMPRESS_FUNCTIONS
114 };
115
116 /* N.B. when altering this value, also change BOOTFS_COMPRESS_VALID below */
117 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB
118 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF
119
120 #define BOOTFS_COMPRESS_VALID(compress) \
121 ((compress) == ZIO_COMPRESS_LZJB || \
122 (compress) == ZIO_COMPRESS_LZ4 || \
123 ((compress) == ZIO_COMPRESS_ON && \
124 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \
125 (compress) == ZIO_COMPRESS_OFF)
126
127 #define ZIO_FAILURE_MODE_WAIT 0
128 #define ZIO_FAILURE_MODE_CONTINUE 1
129 #define ZIO_FAILURE_MODE_PANIC 2
130
131 typedef enum zio_priority {
132 ZIO_PRIORITY_SYNC_READ,
133 ZIO_PRIORITY_SYNC_WRITE, /* ZIL */
134 ZIO_PRIORITY_ASYNC_READ, /* prefetch */
135 ZIO_PRIORITY_ASYNC_WRITE, /* spa_sync() */
136 ZIO_PRIORITY_SCRUB, /* asynchronous scrub/resilver reads */
137 ZIO_PRIORITY_NUM_QUEUEABLE,
138
139 ZIO_PRIORITY_NOW /* non-queued i/os (e.g. free) */
140 } zio_priority_t;
141
142 #define ZIO_PIPELINE_CONTINUE 0x100
143 #define ZIO_PIPELINE_STOP 0x101
144
145 enum zio_flag {
146 /*
147 * Flags inherited by gang, ddt, and vdev children,
148 * and that must be equal for two zios to aggregate
149 */
150 ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
151 ZIO_FLAG_IO_REPAIR = 1 << 1,
152 ZIO_FLAG_SELF_HEAL = 1 << 2,
153 ZIO_FLAG_RESILVER = 1 << 3,
154 ZIO_FLAG_SCRUB = 1 << 4,
155 ZIO_FLAG_SCAN_THREAD = 1 << 5,
156
157 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
158
159 /*
160 * Flags inherited by ddt, gang, and vdev children.
161 */
162 ZIO_FLAG_CANFAIL = 1 << 6, /* must be first for INHERIT */
163 ZIO_FLAG_SPECULATIVE = 1 << 7,
164 ZIO_FLAG_CONFIG_WRITER = 1 << 8,
165 ZIO_FLAG_DONT_RETRY = 1 << 9,
166 ZIO_FLAG_DONT_CACHE = 1 << 10,
167 ZIO_FLAG_NODATA = 1 << 11,
168 ZIO_FLAG_INDUCE_DAMAGE = 1 << 12,
169
170 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
171 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)
172
173 /*
174 * Flags inherited by vdev children.
175 */
176 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */
177 ZIO_FLAG_PROBE = 1 << 14,
178 ZIO_FLAG_TRYHARD = 1 << 15,
179 ZIO_FLAG_OPTIONAL = 1 << 16,
180
181 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
182
183 /*
184 * Flags not inherited by any children.
185 */
186 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */
187 ZIO_FLAG_DONT_PROPAGATE = 1 << 18,
188 ZIO_FLAG_IO_BYPASS = 1 << 19,
189 ZIO_FLAG_IO_REWRITE = 1 << 20,
190 ZIO_FLAG_RAW = 1 << 21,
191 ZIO_FLAG_GANG_CHILD = 1 << 22,
192 ZIO_FLAG_DDT_CHILD = 1 << 23,
193 ZIO_FLAG_GODFATHER = 1 << 24,
194 ZIO_FLAG_NOPWRITE = 1 << 25,
195 ZIO_FLAG_REEXECUTED = 1 << 26,
196 ZIO_FLAG_DELEGATED = 1 << 27,
197 };
198
199 #define ZIO_FLAG_MUSTSUCCEED 0
200
201 #define ZIO_DDT_CHILD_FLAGS(zio) \
202 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \
203 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
204
205 #define ZIO_GANG_CHILD_FLAGS(zio) \
206 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \
207 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
208
209 #define ZIO_VDEV_CHILD_FLAGS(zio) \
210 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \
211 ZIO_FLAG_CANFAIL)
212
213 enum zio_child {
214 ZIO_CHILD_VDEV = 0,
215 ZIO_CHILD_GANG,
216 ZIO_CHILD_DDT,
217 ZIO_CHILD_LOGICAL,
218 ZIO_CHILD_TYPES
219 };
220
221 enum zio_wait_type {
222 ZIO_WAIT_READY = 0,
223 ZIO_WAIT_DONE,
224 ZIO_WAIT_TYPES
225 };
226
227 /*
228 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
229 * graveyard) to indicate checksum errors and fragmentation.
230 */
231 #define ECKSUM EBADE
232 #define EFRAGS EBADR
233
234 typedef void zio_done_func_t(zio_t *zio);
235
236 extern const char *zio_type_name[ZIO_TYPES];
237
238 /*
239 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
240 * identifies any block in the pool. By convention, the meta-objset (MOS)
241 * is objset 0, and the meta-dnode is object 0. This covers all blocks
242 * except root blocks and ZIL blocks, which are defined as follows:
243 *
244 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
245 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
246 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
247 *
248 * Note: this structure is called a bookmark because its original purpose
249 * was to remember where to resume a pool-wide traverse.
250 *
251 * Note: this structure is passed between userland and the kernel.
252 * Therefore it must not change size or alignment between 32/64 bit
253 * compilation options.
254 */
255 typedef struct zbookmark {
256 uint64_t zb_objset;
257 uint64_t zb_object;
258 int64_t zb_level;
259 uint64_t zb_blkid;
260 } zbookmark_t;
261
262 #define SET_BOOKMARK(zb, objset, object, level, blkid) \
263 { \
264 (zb)->zb_objset = objset; \
265 (zb)->zb_object = object; \
266 (zb)->zb_level = level; \
267 (zb)->zb_blkid = blkid; \
268 }
269
270 #define ZB_DESTROYED_OBJSET (-1ULL)
271
272 #define ZB_ROOT_OBJECT (0ULL)
273 #define ZB_ROOT_LEVEL (-1LL)
274 #define ZB_ROOT_BLKID (0ULL)
275
276 #define ZB_ZIL_OBJECT (0ULL)
277 #define ZB_ZIL_LEVEL (-2LL)
278
279 #define ZB_IS_ZERO(zb) \
280 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \
281 (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
282 #define ZB_IS_ROOT(zb) \
283 ((zb)->zb_object == ZB_ROOT_OBJECT && \
284 (zb)->zb_level == ZB_ROOT_LEVEL && \
285 (zb)->zb_blkid == ZB_ROOT_BLKID)
286
287 typedef struct zio_prop {
288 enum zio_checksum zp_checksum;
289 enum zio_compress zp_compress;
290 dmu_object_type_t zp_type;
291 uint8_t zp_level;
292 uint8_t zp_copies;
293 boolean_t zp_dedup;
294 boolean_t zp_dedup_verify;
295 boolean_t zp_nopwrite;
296 } zio_prop_t;
297
298 typedef struct zio_cksum_report zio_cksum_report_t;
299
300 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
301 const void *good_data);
302 typedef void zio_cksum_free_f(void *cbdata, size_t size);
303
304 struct zio_bad_cksum; /* defined in zio_checksum.h */
305 struct dnode_phys;
306
307 struct zio_cksum_report {
308 struct zio_cksum_report *zcr_next;
309 nvlist_t *zcr_ereport;
310 nvlist_t *zcr_detector;
311 void *zcr_cbdata;
312 size_t zcr_cbinfo; /* passed to zcr_free() */
313 uint64_t zcr_align;
314 uint64_t zcr_length;
315 zio_cksum_finish_f *zcr_finish;
316 zio_cksum_free_f *zcr_free;
317
318 /* internal use only */
319 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */
320 };
321
322 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
323 void *arg);
324
325 zio_vsd_cksum_report_f zio_vsd_default_cksum_report;
326
327 typedef struct zio_vsd_ops {
328 zio_done_func_t *vsd_free;
329 zio_vsd_cksum_report_f *vsd_cksum_report;
330 } zio_vsd_ops_t;
331
332 typedef struct zio_gang_node {
333 zio_gbh_phys_t *gn_gbh;
334 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
335 } zio_gang_node_t;
336
337 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
338 zio_gang_node_t *gn, void *data);
339
340 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
341
342 typedef struct zio_transform {
343 void *zt_orig_data;
344 uint64_t zt_orig_size;
345 uint64_t zt_bufsize;
346 zio_transform_func_t *zt_transform;
347 struct zio_transform *zt_next;
348 } zio_transform_t;
349
350 typedef int zio_pipe_stage_t(zio_t *zio);
351
352 /*
353 * The io_reexecute flags are distinct from io_flags because the child must
354 * be able to propagate them to the parent. The normal io_flags are local
355 * to the zio, not protected by any lock, and not modifiable by children;
356 * the reexecute flags are protected by io_lock, modifiable by children,
357 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
358 */
359 #define ZIO_REEXECUTE_NOW 0x01
360 #define ZIO_REEXECUTE_SUSPEND 0x02
361
362 typedef struct zio_link {
363 zio_t *zl_parent;
364 zio_t *zl_child;
365 list_node_t zl_parent_node;
366 list_node_t zl_child_node;
367 } zio_link_t;
368
369 struct zio {
370 /* Core information about this I/O */
371 zbookmark_t io_bookmark;
372 zio_prop_t io_prop;
373 zio_type_t io_type;
374 enum zio_child io_child_type;
375 int io_cmd;
376 zio_priority_t io_priority;
377 uint8_t io_reexecute;
378 uint8_t io_state[ZIO_WAIT_TYPES];
379 uint64_t io_txg;
380 spa_t *io_spa;
381 blkptr_t *io_bp;
382 blkptr_t *io_bp_override;
383 blkptr_t io_bp_copy;
384 list_t io_parent_list;
385 list_t io_child_list;
386 zio_link_t *io_walk_link;
387 zio_t *io_logical;
388 zio_transform_t *io_transform_stack;
389
390 /* Callback info */
391 zio_done_func_t *io_ready;
392 zio_done_func_t *io_physdone;
393 zio_done_func_t *io_done;
394 void *io_private;
395 int64_t io_prev_space_delta; /* DMU private */
396 blkptr_t io_bp_orig;
397
398 /* Data represented by this I/O */
399 void *io_data;
400 void *io_orig_data;
401 uint64_t io_size;
402 uint64_t io_orig_size;
403
404 /* Stuff for the vdev stack */
405 vdev_t *io_vd;
406 void *io_vsd;
407 const zio_vsd_ops_t *io_vsd_ops;
408
409 uint64_t io_offset;
410 hrtime_t io_timestamp;
411 avl_node_t io_queue_node;
412
413 /* Internal pipeline state */
414 enum zio_flag io_flags;
415 enum zio_stage io_stage;
416 enum zio_stage io_pipeline;
417 enum zio_flag io_orig_flags;
418 enum zio_stage io_orig_stage;
419 enum zio_stage io_orig_pipeline;
420 int io_error;
421 int io_child_error[ZIO_CHILD_TYPES];
422 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
423 uint64_t io_child_count;
424 uint64_t io_phys_children;
425 uint64_t io_parent_count;
426 uint64_t *io_stall;
427 zio_t *io_gang_leader;
428 zio_gang_node_t *io_gang_tree;
429 void *io_executor;
430 void *io_waiter;
431 kmutex_t io_lock;
432 kcondvar_t io_cv;
433
434 /* FMA state */
435 zio_cksum_report_t *io_cksum_report;
436 uint64_t io_ena;
437
438 /* Taskq dispatching state */
439 taskq_ent_t io_tqent;
440 };
441
442 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
443 zio_done_func_t *done, void *private, enum zio_flag flags);
444
445 extern zio_t *zio_root(spa_t *spa,
446 zio_done_func_t *done, void *private, enum zio_flag flags);
447
448 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
449 uint64_t size, zio_done_func_t *done, void *private,
450 zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb);
451
452 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
453 void *data, uint64_t size, const zio_prop_t *zp,
454 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done,
455 void *private,
456 zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb);
457
458 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
459 void *data, uint64_t size, zio_done_func_t *done, void *private,
460 zio_priority_t priority, enum zio_flag flags, zbookmark_t *zb);
461
462 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
463 boolean_t nopwrite);
464
465 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
466
467 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
468 const blkptr_t *bp,
469 zio_done_func_t *done, void *private, enum zio_flag flags);
470
471 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
472 zio_done_func_t *done, void *private, enum zio_flag flags);
473
474 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
475 uint64_t size, void *data, int checksum,
476 zio_done_func_t *done, void *private, zio_priority_t priority,
477 enum zio_flag flags, boolean_t labels);
478
479 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
480 uint64_t size, void *data, int checksum,
481 zio_done_func_t *done, void *private, zio_priority_t priority,
482 enum zio_flag flags, boolean_t labels);
483
484 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
485 const blkptr_t *bp, enum zio_flag flags);
486
487 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
488 blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
489 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
490 extern void zio_flush(zio_t *zio, vdev_t *vd);
491 extern void zio_shrink(zio_t *zio, uint64_t size);
492
493 extern int zio_wait(zio_t *zio);
494 extern void zio_nowait(zio_t *zio);
495 extern void zio_execute(zio_t *zio);
496 extern void zio_interrupt(zio_t *zio);
497
498 extern zio_t *zio_walk_parents(zio_t *cio);
499 extern zio_t *zio_walk_children(zio_t *pio);
500 extern zio_t *zio_unique_parent(zio_t *cio);
501 extern void zio_add_child(zio_t *pio, zio_t *cio);
502
503 extern void *zio_buf_alloc(size_t size);
504 extern void zio_buf_free(void *buf, size_t size);
505 extern void *zio_data_buf_alloc(size_t size);
506 extern void zio_data_buf_free(void *buf, size_t size);
507
508 extern void zio_resubmit_stage_async(void *);
509
510 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
511 uint64_t offset, void *data, uint64_t size, int type,
512 zio_priority_t priority, enum zio_flag flags,
513 zio_done_func_t *done, void *private);
514
515 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
516 void *data, uint64_t size, int type, zio_priority_t priority,
517 enum zio_flag flags, zio_done_func_t *done, void *private);
518
519 extern void zio_vdev_io_bypass(zio_t *zio);
520 extern void zio_vdev_io_reissue(zio_t *zio);
521 extern void zio_vdev_io_redone(zio_t *zio);
522
523 extern void zio_checksum_verified(zio_t *zio);
524 extern int zio_worst_error(int e1, int e2);
525
526 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
527 enum zio_checksum parent);
528 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
529 enum zio_checksum child, enum zio_checksum parent);
530 extern enum zio_compress zio_compress_select(enum zio_compress child,
531 enum zio_compress parent);
532
533 extern void zio_suspend(spa_t *spa, zio_t *zio);
534 extern int zio_resume(spa_t *spa);
535 extern void zio_resume_wait(spa_t *spa);
536
537 /*
538 * Initial setup and teardown.
539 */
540 extern void zio_init(void);
541 extern void zio_fini(void);
542
543 /*
544 * Fault injection
545 */
546 struct zinject_record;
547 extern uint32_t zio_injection_enabled;
548 extern int zio_inject_fault(char *name, int flags, int *id,
549 struct zinject_record *record);
550 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
551 struct zinject_record *record);
552 extern int zio_clear_fault(int id);
553 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
554 extern int zio_handle_fault_injection(zio_t *zio, int error);
555 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
556 extern int zio_handle_label_injection(zio_t *zio, int error);
557 extern void zio_handle_ignored_writes(zio_t *zio);
558 extern uint64_t zio_handle_io_delay(zio_t *zio);
559
560 /*
561 * Checksum ereport functions
562 */
563 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
564 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
565 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
566 const void *good_data, const void *bad_data, boolean_t drop_if_identical);
567
568 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
569 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
570
571 /* If we have the good data in hand, this function can be used */
572 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
573 struct zio *zio, uint64_t offset, uint64_t length,
574 const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
575
576 /* Called from spa_sync(), but primarily an injection handler */
577 extern void spa_handle_ignored_writes(spa_t *spa);
578
579 /* zbookmark functions */
580 boolean_t zbookmark_is_before(const struct dnode_phys *dnp,
581 const zbookmark_t *zb1, const zbookmark_t *zb2);
582
583 #ifdef __cplusplus
584 }
585 #endif
586
587 #endif /* _ZIO_H */