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