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 * 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_EDONR512_256,
83 ZIO_CHECKSUM_FUNCTIONS
84 };
85
86 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4
87 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON
88
89 #define ZIO_CHECKSUM_MASK 0xffULL
90 #define ZIO_CHECKSUM_VERIFY (1 << 8)
91
92 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256
93 #define ZIO_DEDUPDITTO_MIN 100
94
95 enum zio_compress {
96 ZIO_COMPRESS_INHERIT = 0,
97 ZIO_COMPRESS_ON,
98 ZIO_COMPRESS_OFF,
99 ZIO_COMPRESS_LZJB,
100 ZIO_COMPRESS_EMPTY,
101 ZIO_COMPRESS_GZIP_1,
102 ZIO_COMPRESS_GZIP_2,
103 ZIO_COMPRESS_GZIP_3,
104 ZIO_COMPRESS_GZIP_4,
105 ZIO_COMPRESS_GZIP_5,
106 ZIO_COMPRESS_GZIP_6,
107 ZIO_COMPRESS_GZIP_7,
108 ZIO_COMPRESS_GZIP_8,
109 ZIO_COMPRESS_GZIP_9,
110 ZIO_COMPRESS_ZLE,
111 ZIO_COMPRESS_LZ4,
112 ZIO_COMPRESS_FUNCTIONS
113 };
114
115 /* N.B. when altering this value, also change BOOTFS_COMPRESS_VALID below */
116 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB
117 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF
118
119 #define BOOTFS_COMPRESS_VALID(compress) \
120 ((compress) == ZIO_COMPRESS_LZJB || \
121 (compress) == ZIO_COMPRESS_LZ4 || \
122 ((compress) == ZIO_COMPRESS_ON && \
123 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \
124 (compress) == ZIO_COMPRESS_OFF)
125
126 #define ZIO_FAILURE_MODE_WAIT 0
127 #define ZIO_FAILURE_MODE_CONTINUE 1
128 #define ZIO_FAILURE_MODE_PANIC 2
129
130 #define ZIO_PRIORITY_NOW (zio_priority_table[0])
131 #define ZIO_PRIORITY_SYNC_READ (zio_priority_table[1])
132 #define ZIO_PRIORITY_SYNC_WRITE (zio_priority_table[2])
133 #define ZIO_PRIORITY_LOG_WRITE (zio_priority_table[3])
134 #define ZIO_PRIORITY_CACHE_FILL (zio_priority_table[4])
135 #define ZIO_PRIORITY_AGG (zio_priority_table[5])
136 #define ZIO_PRIORITY_FREE (zio_priority_table[6])
137 #define ZIO_PRIORITY_ASYNC_WRITE (zio_priority_table[7])
138 #define ZIO_PRIORITY_ASYNC_READ (zio_priority_table[8])
139 #define ZIO_PRIORITY_RESILVER (zio_priority_table[9])
140 #define ZIO_PRIORITY_SCRUB (zio_priority_table[10])
141 #define ZIO_PRIORITY_DDT_PREFETCH (zio_priority_table[11])
142 #define ZIO_PRIORITY_TABLE_SIZE 12
143
144 #define ZIO_PIPELINE_CONTINUE 0x100
145 #define ZIO_PIPELINE_STOP 0x101
146
147 enum zio_flag {
148 /*
149 * Flags inherited by gang, ddt, and vdev children,
150 * and that must be equal for two zios to aggregate
151 */
152 ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
153 ZIO_FLAG_IO_REPAIR = 1 << 1,
154 ZIO_FLAG_SELF_HEAL = 1 << 2,
155 ZIO_FLAG_RESILVER = 1 << 3,
156 ZIO_FLAG_SCRUB = 1 << 4,
157 ZIO_FLAG_SCAN_THREAD = 1 << 5,
158
159 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
160
161 /*
162 * Flags inherited by ddt, gang, and vdev children.
163 */
164 ZIO_FLAG_CANFAIL = 1 << 6, /* must be first for INHERIT */
165 ZIO_FLAG_SPECULATIVE = 1 << 7,
166 ZIO_FLAG_CONFIG_WRITER = 1 << 8,
167 ZIO_FLAG_DONT_RETRY = 1 << 9,
168 ZIO_FLAG_DONT_CACHE = 1 << 10,
169 ZIO_FLAG_NODATA = 1 << 11,
170 ZIO_FLAG_INDUCE_DAMAGE = 1 << 12,
171
172 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
173 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)
174
175 /*
176 * Flags inherited by vdev children.
177 */
178 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */
179 ZIO_FLAG_PROBE = 1 << 14,
180 ZIO_FLAG_TRYHARD = 1 << 15,
181 ZIO_FLAG_OPTIONAL = 1 << 16,
182
183 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
184
185 /*
186 * Flags not inherited by any children.
187 */
188 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */
189 ZIO_FLAG_DONT_PROPAGATE = 1 << 18,
190 ZIO_FLAG_IO_BYPASS = 1 << 19,
191 ZIO_FLAG_IO_REWRITE = 1 << 20,
192 ZIO_FLAG_RAW = 1 << 21,
193 ZIO_FLAG_GANG_CHILD = 1 << 22,
194 ZIO_FLAG_DDT_CHILD = 1 << 23,
195 ZIO_FLAG_GODFATHER = 1 << 24,
196 ZIO_FLAG_NOPWRITE = 1 << 25,
197 ZIO_FLAG_REEXECUTED = 1 << 26,
198 };
199
200 #define ZIO_FLAG_MUSTSUCCEED 0
201
202 #define ZIO_DDT_CHILD_FLAGS(zio) \
203 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \
204 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
205
206 #define ZIO_GANG_CHILD_FLAGS(zio) \
207 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \
208 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
209
210 #define ZIO_VDEV_CHILD_FLAGS(zio) \
211 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \
212 ZIO_FLAG_CANFAIL)
213
214 enum zio_child {
215 ZIO_CHILD_VDEV = 0,
216 ZIO_CHILD_GANG,
217 ZIO_CHILD_DDT,
218 ZIO_CHILD_LOGICAL,
219 ZIO_CHILD_TYPES
220 };
221
222 enum zio_wait_type {
223 ZIO_WAIT_READY = 0,
224 ZIO_WAIT_DONE,
225 ZIO_WAIT_TYPES
226 };
227
228 /*
229 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
230 * graveyard) to indicate checksum errors and fragmentation.
231 */
232 #define ECKSUM EBADE
233 #define EFRAGS EBADR
234
235 typedef void zio_done_func_t(zio_t *zio);
236
237 extern uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE];
238 extern char *zio_type_name[ZIO_TYPES];
239
240 /*
241 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
242 * identifies any block in the pool. By convention, the meta-objset (MOS)
243 * is objset 0, and the meta-dnode is object 0. This covers all blocks
244 * except root blocks and ZIL blocks, which are defined as follows:
245 *
246 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
247 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
248 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
249 *
250 * Note: this structure is called a bookmark because its original purpose
251 * was to remember where to resume a pool-wide traverse.
252 *
253 * Note: this structure is passed between userland and the kernel.
254 * Therefore it must not change size or alignment between 32/64 bit
255 * compilation options.
256 */
257 typedef struct zbookmark {
258 uint64_t zb_objset;
259 uint64_t zb_object;
260 int64_t zb_level;
261 uint64_t zb_blkid;
262 } zbookmark_t;
263
264 #define SET_BOOKMARK(zb, objset, object, level, blkid) \
265 { \
266 (zb)->zb_objset = objset; \
267 (zb)->zb_object = object; \
268 (zb)->zb_level = level; \
269 (zb)->zb_blkid = blkid; \
270 }
271
272 #define ZB_DESTROYED_OBJSET (-1ULL)
273
274 #define ZB_ROOT_OBJECT (0ULL)
275 #define ZB_ROOT_LEVEL (-1LL)
276 #define ZB_ROOT_BLKID (0ULL)
277
278 #define ZB_ZIL_OBJECT (0ULL)
279 #define ZB_ZIL_LEVEL (-2LL)
280
281 #define ZB_IS_ZERO(zb) \
282 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \
283 (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
284 #define ZB_IS_ROOT(zb) \
285 ((zb)->zb_object == ZB_ROOT_OBJECT && \
286 (zb)->zb_level == ZB_ROOT_LEVEL && \
287 (zb)->zb_blkid == ZB_ROOT_BLKID)
288
289 typedef struct zio_prop {
290 enum zio_checksum zp_checksum;
291 enum zio_compress zp_compress;
292 dmu_object_type_t zp_type;
293 uint8_t zp_level;
294 uint8_t zp_copies;
295 boolean_t zp_dedup;
296 boolean_t zp_dedup_verify;
297 boolean_t zp_nopwrite;
298 } zio_prop_t;
299
300 typedef struct zio_cksum_report zio_cksum_report_t;
301
302 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
303 const void *good_data);
304 typedef void zio_cksum_free_f(void *cbdata, size_t size);
305
306 struct zio_bad_cksum; /* defined in zio_checksum.h */
307 struct dnode_phys;
308
309 struct zio_cksum_report {
310 struct zio_cksum_report *zcr_next;
311 nvlist_t *zcr_ereport;
312 nvlist_t *zcr_detector;
313 void *zcr_cbdata;
314 size_t zcr_cbinfo; /* passed to zcr_free() */
315 uint64_t zcr_align;
316 uint64_t zcr_length;
317 zio_cksum_finish_f *zcr_finish;
318 zio_cksum_free_f *zcr_free;
319
320 /* internal use only */
321 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */
322 };
323
324 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
325 void *arg);
326
327 zio_vsd_cksum_report_f zio_vsd_default_cksum_report;
328
329 typedef struct zio_vsd_ops {
330 zio_done_func_t *vsd_free;
331 zio_vsd_cksum_report_f *vsd_cksum_report;
332 } zio_vsd_ops_t;
333
334 typedef struct zio_gang_node {
335 zio_gbh_phys_t *gn_gbh;
336 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
337 } zio_gang_node_t;
338
339 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
340 zio_gang_node_t *gn, void *data);
341
342 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
343
344 typedef struct zio_transform {
345 void *zt_orig_data;
346 uint64_t zt_orig_size;
347 uint64_t zt_bufsize;
348 zio_transform_func_t *zt_transform;
349 struct zio_transform *zt_next;
350 } zio_transform_t;
351
352 typedef int zio_pipe_stage_t(zio_t *zio);
353
354 /*
355 * The io_reexecute flags are distinct from io_flags because the child must
356 * be able to propagate them to the parent. The normal io_flags are local
357 * to the zio, not protected by any lock, and not modifiable by children;
358 * the reexecute flags are protected by io_lock, modifiable by children,
359 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
360 */
361 #define ZIO_REEXECUTE_NOW 0x01
362 #define ZIO_REEXECUTE_SUSPEND 0x02
363
364 typedef struct zio_link {
365 zio_t *zl_parent;
366 zio_t *zl_child;
367 list_node_t zl_parent_node;
368 list_node_t zl_child_node;
369 } zio_link_t;
370
371 struct zio {
372 /* Core information about this I/O */
373 zbookmark_t io_bookmark;
374 zio_prop_t io_prop;
375 zio_type_t io_type;
376 enum zio_child io_child_type;
377 int io_cmd;
378 uint8_t io_priority;
379 uint8_t io_reexecute;
380 uint8_t io_state[ZIO_WAIT_TYPES];
381 uint64_t io_txg;
382 spa_t *io_spa;
383 blkptr_t *io_bp;
384 blkptr_t *io_bp_override;
385 blkptr_t io_bp_copy;
386 list_t io_parent_list;
387 list_t io_child_list;
388 zio_link_t *io_walk_link;
389 zio_t *io_logical;
390 zio_transform_t *io_transform_stack;
391
392 /* Callback info */
393 zio_done_func_t *io_ready;
394 zio_done_func_t *io_done;
395 void *io_private;
396 int64_t io_prev_space_delta; /* DMU private */
397 blkptr_t io_bp_orig;
398
399 /* Data represented by this I/O */
400 void *io_data;
401 void *io_orig_data;
402 uint64_t io_size;
403 uint64_t io_orig_size;
404
405 /* Stuff for the vdev stack */
406 vdev_t *io_vd;
407 void *io_vsd;
408 const zio_vsd_ops_t *io_vsd_ops;
409
410 uint64_t io_offset;
411 uint64_t io_deadline;
412 uint64_t io_timestamp;
413 avl_node_t io_offset_node;
414 avl_node_t io_deadline_node;
415 avl_tree_t *io_vdev_tree;
416
417 /* Internal pipeline state */
418 enum zio_flag io_flags;
419 enum zio_stage io_stage;
420 enum zio_stage io_pipeline;
421 enum zio_flag io_orig_flags;
422 enum zio_stage io_orig_stage;
423 enum zio_stage io_orig_pipeline;
424 int io_error;
425 int io_child_error[ZIO_CHILD_TYPES];
426 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
427 uint64_t io_child_count;
428 uint64_t io_parent_count;
429 uint64_t *io_stall;
430 zio_t *io_gang_leader;
431 zio_gang_node_t *io_gang_tree;
432 void *io_executor;
433 void *io_waiter;
434 kmutex_t io_lock;
435 kcondvar_t io_cv;
436
437 /* FMA state */
438 zio_cksum_report_t *io_cksum_report;
439 uint64_t io_ena;
440
441 /* Taskq dispatching state */
442 taskq_ent_t io_tqent;
443 };
444
445 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
446 zio_done_func_t *done, void *private, enum zio_flag flags);
447
448 extern zio_t *zio_root(spa_t *spa,
449 zio_done_func_t *done, void *private, enum zio_flag flags);
450
451 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
452 uint64_t size, zio_done_func_t *done, void *private,
453 int priority, enum zio_flag flags, const zbookmark_t *zb);
454
455 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
456 void *data, uint64_t size, const zio_prop_t *zp,
457 zio_done_func_t *ready, zio_done_func_t *done, void *private,
458 int priority, enum zio_flag flags, const zbookmark_t *zb);
459
460 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
461 void *data, uint64_t size, zio_done_func_t *done, void *private,
462 int priority, enum zio_flag flags, zbookmark_t *zb);
463
464 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
465 boolean_t nopwrite);
466
467 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
468
469 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
470 const blkptr_t *bp,
471 zio_done_func_t *done, void *private, enum zio_flag flags);
472
473 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
474 zio_done_func_t *done, void *private, int priority, enum zio_flag flags);
475
476 extern zio_t *zio_read_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_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
482 uint64_t size, void *data, int checksum,
483 zio_done_func_t *done, void *private, int priority, enum zio_flag flags,
484 boolean_t labels);
485
486 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
487 const blkptr_t *bp, enum zio_flag flags);
488
489 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
490 blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
491 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
492 extern void zio_flush(zio_t *zio, vdev_t *vd);
493 extern void zio_shrink(zio_t *zio, uint64_t size);
494
495 extern int zio_wait(zio_t *zio);
496 extern void zio_nowait(zio_t *zio);
497 extern void zio_execute(zio_t *zio);
498 extern void zio_interrupt(zio_t *zio);
499
500 extern zio_t *zio_walk_parents(zio_t *cio);
501 extern zio_t *zio_walk_children(zio_t *pio);
502 extern zio_t *zio_unique_parent(zio_t *cio);
503 extern void zio_add_child(zio_t *pio, zio_t *cio);
504
505 extern void *zio_buf_alloc(size_t size);
506 extern void zio_buf_free(void *buf, size_t size);
507 extern void *zio_data_buf_alloc(size_t size);
508 extern void zio_data_buf_free(void *buf, size_t size);
509
510 extern void zio_resubmit_stage_async(void *);
511
512 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
513 uint64_t offset, void *data, uint64_t size, int type, int priority,
514 enum zio_flag flags, zio_done_func_t *done, void *private);
515
516 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
517 void *data, uint64_t size, int type, int priority,
518 enum zio_flag flags, zio_done_func_t *done, void *private);
519
520 extern void zio_vdev_io_bypass(zio_t *zio);
521 extern void zio_vdev_io_reissue(zio_t *zio);
522 extern void zio_vdev_io_redone(zio_t *zio);
523
524 extern void zio_checksum_verified(zio_t *zio);
525 extern int zio_worst_error(int e1, int e2);
526
527 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
528 enum zio_checksum parent);
529 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
530 enum zio_checksum child, enum zio_checksum parent);
531 extern enum zio_compress zio_compress_select(enum zio_compress child,
532 enum zio_compress parent);
533
534 extern void zio_suspend(spa_t *spa, zio_t *zio);
535 extern int zio_resume(spa_t *spa);
536 extern void zio_resume_wait(spa_t *spa);
537
538 /*
539 * Initial setup and teardown.
540 */
541 extern void zio_init(void);
542 extern void zio_fini(void);
543
544 /*
545 * Fault injection
546 */
547 struct zinject_record;
548 extern uint32_t zio_injection_enabled;
549 extern int zio_inject_fault(char *name, int flags, int *id,
550 struct zinject_record *record);
551 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
552 struct zinject_record *record);
553 extern int zio_clear_fault(int id);
554 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
555 extern int zio_handle_fault_injection(zio_t *zio, int error);
556 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
557 extern int zio_handle_label_injection(zio_t *zio, int error);
558 extern void zio_handle_ignored_writes(zio_t *zio);
559 extern uint64_t zio_handle_io_delay(zio_t *zio);
560
561 /*
562 * Checksum ereport functions
563 */
564 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
565 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
566 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
567 const void *good_data, const void *bad_data, boolean_t drop_if_identical);
568
569 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
570 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
571
572 /* If we have the good data in hand, this function can be used */
573 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
574 struct zio *zio, uint64_t offset, uint64_t length,
575 const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
576
577 /* Called from spa_sync(), but primarily an injection handler */
578 extern void spa_handle_ignored_writes(spa_t *spa);
579
580 /* zbookmark functions */
581 boolean_t zbookmark_is_before(const struct dnode_phys *dnp,
582 const zbookmark_t *zb1, const zbookmark_t *zb2);
583
584 #ifdef __cplusplus
585 }
586 #endif
587
588 #endif /* _ZIO_H */