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