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_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 #define ZIO_PRIORITY_NOW (zio_priority_table[0])
130 #define ZIO_PRIORITY_SYNC_READ (zio_priority_table[1])
131 #define ZIO_PRIORITY_SYNC_WRITE (zio_priority_table[2])
132 #define ZIO_PRIORITY_LOG_WRITE (zio_priority_table[3])
133 #define ZIO_PRIORITY_CACHE_FILL (zio_priority_table[4])
134 #define ZIO_PRIORITY_AGG (zio_priority_table[5])
135 #define ZIO_PRIORITY_FREE (zio_priority_table[6])
136 #define ZIO_PRIORITY_ASYNC_WRITE (zio_priority_table[7])
137 #define ZIO_PRIORITY_ASYNC_READ (zio_priority_table[8])
138 #define ZIO_PRIORITY_RESILVER (zio_priority_table[9])
139 #define ZIO_PRIORITY_SCRUB (zio_priority_table[10])
140 #define ZIO_PRIORITY_DDT_PREFETCH (zio_priority_table[11])
141 #define ZIO_PRIORITY_TABLE_SIZE 12
142
143 #define ZIO_PIPELINE_CONTINUE 0x100
144 #define ZIO_PIPELINE_STOP 0x101
145
146 enum zio_flag {
147 /*
148 * Flags inherited by gang, ddt, and vdev children,
149 * and that must be equal for two zios to aggregate
150 */
151 ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
152 ZIO_FLAG_IO_REPAIR = 1 << 1,
153 ZIO_FLAG_SELF_HEAL = 1 << 2,
154 ZIO_FLAG_RESILVER = 1 << 3,
155 ZIO_FLAG_SCRUB = 1 << 4,
156 ZIO_FLAG_SCAN_THREAD = 1 << 5,
157
158 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
159
160 /*
161 * Flags inherited by ddt, gang, and vdev children.
162 */
163 ZIO_FLAG_CANFAIL = 1 << 6, /* must be first for INHERIT */
164 ZIO_FLAG_SPECULATIVE = 1 << 7,
165 ZIO_FLAG_CONFIG_WRITER = 1 << 8,
166 ZIO_FLAG_DONT_RETRY = 1 << 9,
167 ZIO_FLAG_DONT_CACHE = 1 << 10,
168 ZIO_FLAG_NODATA = 1 << 11,
169 ZIO_FLAG_INDUCE_DAMAGE = 1 << 12,
170
171 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
172 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)
173
174 /*
175 * Flags inherited by vdev children.
176 */
177 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */
178 ZIO_FLAG_PROBE = 1 << 14,
179 ZIO_FLAG_TRYHARD = 1 << 15,
180 ZIO_FLAG_OPTIONAL = 1 << 16,
181
182 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
183
184 /*
185 * Flags not inherited by any children.
186 */
187 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */
188 ZIO_FLAG_DONT_PROPAGATE = 1 << 18,
189 ZIO_FLAG_IO_BYPASS = 1 << 19,
190 ZIO_FLAG_IO_REWRITE = 1 << 20,
191 ZIO_FLAG_RAW = 1 << 21,
192 ZIO_FLAG_GANG_CHILD = 1 << 22,
193 ZIO_FLAG_DDT_CHILD = 1 << 23,
194 ZIO_FLAG_GODFATHER = 1 << 24,
195 ZIO_FLAG_NOPWRITE = 1 << 25,
196 ZIO_FLAG_REEXECUTED = 1 << 26,
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 uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE];
237 extern char *zio_type_name[ZIO_TYPES];
238
239 /*
240 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
241 * identifies any block in the pool. By convention, the meta-objset (MOS)
242 * is objset 0, and the meta-dnode is object 0. This covers all blocks
243 * except root blocks and ZIL blocks, which are defined as follows:
244 *
245 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
246 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
247 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
248 *
249 * Note: this structure is called a bookmark because its original purpose
250 * was to remember where to resume a pool-wide traverse.
251 *
252 * Note: this structure is passed between userland and the kernel.
253 * Therefore it must not change size or alignment between 32/64 bit
254 * compilation options.
255 */
256 typedef struct zbookmark {
257 uint64_t zb_objset;
258 uint64_t zb_object;
259 int64_t zb_level;
260 uint64_t zb_blkid;
261 } zbookmark_t;
262
263 #define SET_BOOKMARK(zb, objset, object, level, blkid) \
264 { \
265 (zb)->zb_objset = objset; \
266 (zb)->zb_object = object; \
267 (zb)->zb_level = level; \
268 (zb)->zb_blkid = blkid; \
269 }
270
271 #define ZB_DESTROYED_OBJSET (-1ULL)
272
273 #define ZB_ROOT_OBJECT (0ULL)
274 #define ZB_ROOT_LEVEL (-1LL)
275 #define ZB_ROOT_BLKID (0ULL)
276
277 #define ZB_ZIL_OBJECT (0ULL)
278 #define ZB_ZIL_LEVEL (-2LL)
279
280 #define ZB_IS_ZERO(zb) \
281 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \
282 (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
283 #define ZB_IS_ROOT(zb) \
284 ((zb)->zb_object == ZB_ROOT_OBJECT && \
285 (zb)->zb_level == ZB_ROOT_LEVEL && \
286 (zb)->zb_blkid == ZB_ROOT_BLKID)
287
288 typedef struct zio_prop {
289 enum zio_checksum zp_checksum;
290 enum zio_compress zp_compress;
291 dmu_object_type_t zp_type;
292 uint8_t zp_level;
293 uint8_t zp_copies;
294 boolean_t zp_dedup;
295 boolean_t zp_dedup_verify;
296 boolean_t zp_nopwrite;
297 } zio_prop_t;
298
299 typedef struct zio_cksum_report zio_cksum_report_t;
300
301 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
302 const void *good_data);
303 typedef void zio_cksum_free_f(void *cbdata, size_t size);
304
305 struct zio_bad_cksum; /* defined in zio_checksum.h */
306 struct dnode_phys;
307
308 struct zio_cksum_report {
309 struct zio_cksum_report *zcr_next;
310 nvlist_t *zcr_ereport;
311 nvlist_t *zcr_detector;
312 void *zcr_cbdata;
313 size_t zcr_cbinfo; /* passed to zcr_free() */
314 uint64_t zcr_align;
315 uint64_t zcr_length;
316 zio_cksum_finish_f *zcr_finish;
317 zio_cksum_free_f *zcr_free;
318
319 /* internal use only */
320 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */
321 };
322
323 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
324 void *arg);
325
326 zio_vsd_cksum_report_f zio_vsd_default_cksum_report;
327
328 typedef struct zio_vsd_ops {
329 zio_done_func_t *vsd_free;
330 zio_vsd_cksum_report_f *vsd_cksum_report;
331 } zio_vsd_ops_t;
332
333 typedef struct zio_gang_node {
334 zio_gbh_phys_t *gn_gbh;
335 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
336 } zio_gang_node_t;
337
338 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
339 zio_gang_node_t *gn, void *data);
340
341 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
342
343 typedef struct zio_transform {
344 void *zt_orig_data;
345 uint64_t zt_orig_size;
346 uint64_t zt_bufsize;
347 zio_transform_func_t *zt_transform;
348 struct zio_transform *zt_next;
349 } zio_transform_t;
350
351 typedef int zio_pipe_stage_t(zio_t *zio);
352
353 /*
354 * The io_reexecute flags are distinct from io_flags because the child must
355 * be able to propagate them to the parent. The normal io_flags are local
356 * to the zio, not protected by any lock, and not modifiable by children;
357 * the reexecute flags are protected by io_lock, modifiable by children,
358 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
359 */
360 #define ZIO_REEXECUTE_NOW 0x01
361 #define ZIO_REEXECUTE_SUSPEND 0x02
362
363 typedef struct zio_link {
364 zio_t *zl_parent;
365 zio_t *zl_child;
366 list_node_t zl_parent_node;
367 list_node_t zl_child_node;
368 } zio_link_t;
369
370 struct zio {
371 /* Core information about this I/O */
372 zbookmark_t io_bookmark;
373 zio_prop_t io_prop;
374 zio_type_t io_type;
375 enum zio_child io_child_type;
376 int io_cmd;
377 uint8_t io_priority;
378 uint8_t io_reexecute;
379 uint8_t io_state[ZIO_WAIT_TYPES];
380 uint64_t io_txg;
381 spa_t *io_spa;
382 blkptr_t *io_bp;
383 blkptr_t *io_bp_override;
384 blkptr_t io_bp_copy;
385 list_t io_parent_list;
386 list_t io_child_list;
387 zio_link_t *io_walk_link;
388 zio_t *io_logical;
389 zio_transform_t *io_transform_stack;
390
391 /* Callback info */
392 zio_done_func_t *io_ready;
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 uint64_t io_deadline;
411 uint64_t io_timestamp;
412 avl_node_t io_offset_node;
413 avl_node_t io_deadline_node;
414 avl_tree_t *io_vdev_tree;
415
416 /* Internal pipeline state */
417 enum zio_flag io_flags;
418 enum zio_stage io_stage;
419 enum zio_stage io_pipeline;
420 enum zio_flag io_orig_flags;
421 enum zio_stage io_orig_stage;
422 enum zio_stage io_orig_pipeline;
423 int io_error;
424 int io_child_error[ZIO_CHILD_TYPES];
425 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
426 uint64_t io_child_count;
427 uint64_t io_parent_count;
428 uint64_t *io_stall;
429 zio_t *io_gang_leader;
430 zio_gang_node_t *io_gang_tree;
431 void *io_executor;
432 void *io_waiter;
433 kmutex_t io_lock;
434 kcondvar_t io_cv;
435
436 /* FMA state */
437 zio_cksum_report_t *io_cksum_report;
438 uint64_t io_ena;
439
440 /* Taskq dispatching state */
441 taskq_ent_t io_tqent;
442 };
443
444 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
445 zio_done_func_t *done, void *private, enum zio_flag flags);
446
447 extern zio_t *zio_root(spa_t *spa,
448 zio_done_func_t *done, void *private, enum zio_flag flags);
449
450 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
451 uint64_t size, zio_done_func_t *done, void *private,
452 int priority, enum zio_flag flags, const zbookmark_t *zb);
453
454 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
455 void *data, uint64_t size, const zio_prop_t *zp,
456 zio_done_func_t *ready, zio_done_func_t *done, void *private,
457 int priority, enum zio_flag flags, const zbookmark_t *zb);
458
459 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
460 void *data, uint64_t size, zio_done_func_t *done, void *private,
461 int priority, enum zio_flag flags, zbookmark_t *zb);
462
463 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
464 boolean_t nopwrite);
465
466 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
467
468 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
469 const blkptr_t *bp,
470 zio_done_func_t *done, void *private, enum zio_flag flags);
471
472 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
473 zio_done_func_t *done, void *private, int priority, enum zio_flag flags);
474
475 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
476 uint64_t size, void *data, int checksum,
477 zio_done_func_t *done, void *private, int priority, enum zio_flag flags,
478 boolean_t labels);
479
480 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
481 uint64_t size, void *data, int checksum,
482 zio_done_func_t *done, void *private, int priority, enum zio_flag flags,
483 boolean_t labels);
484
485 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
486 const blkptr_t *bp, enum zio_flag flags);
487
488 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
489 blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
490 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
491 extern void zio_flush(zio_t *zio, vdev_t *vd);
492 extern void zio_shrink(zio_t *zio, uint64_t size);
493
494 extern int zio_wait(zio_t *zio);
495 extern void zio_nowait(zio_t *zio);
496 extern void zio_execute(zio_t *zio);
497 extern void zio_interrupt(zio_t *zio);
498
499 extern zio_t *zio_walk_parents(zio_t *cio);
500 extern zio_t *zio_walk_children(zio_t *pio);
501 extern zio_t *zio_unique_parent(zio_t *cio);
502 extern void zio_add_child(zio_t *pio, zio_t *cio);
503
504 extern void *zio_buf_alloc(size_t size);
505 extern void zio_buf_free(void *buf, size_t size);
506 extern void *zio_data_buf_alloc(size_t size);
507 extern void zio_data_buf_free(void *buf, size_t size);
508
509 extern void zio_resubmit_stage_async(void *);
510
511 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
512 uint64_t offset, void *data, uint64_t size, int type, int priority,
513 enum zio_flag flags, 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, int 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 */