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, 2014 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 /*
88 * The number of "legacy" compression functions which can be set on individual
89 * objects.
90 */
91 #define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2
92
93 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4
94 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON
95
96 #define ZIO_CHECKSUM_MASK 0xffULL
97 #define ZIO_CHECKSUM_VERIFY (1 << 8)
98
99 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256
100 #define ZIO_DEDUPDITTO_MIN 100
101
102 enum zio_compress {
103 ZIO_COMPRESS_INHERIT = 0,
104 ZIO_COMPRESS_ON,
105 ZIO_COMPRESS_OFF,
106 ZIO_COMPRESS_LZJB,
107 ZIO_COMPRESS_EMPTY,
108 ZIO_COMPRESS_GZIP_1,
109 ZIO_COMPRESS_GZIP_2,
110 ZIO_COMPRESS_GZIP_3,
111 ZIO_COMPRESS_GZIP_4,
112 ZIO_COMPRESS_GZIP_5,
113 ZIO_COMPRESS_GZIP_6,
114 ZIO_COMPRESS_GZIP_7,
115 ZIO_COMPRESS_GZIP_8,
116 ZIO_COMPRESS_GZIP_9,
117 ZIO_COMPRESS_ZLE,
118 ZIO_COMPRESS_LZ4,
119 ZIO_COMPRESS_FUNCTIONS
120 };
121
122 /*
123 * The number of "legacy" compression functions which can be set on individual
124 * objects.
125 */
126 #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4
127
128 /* N.B. when altering this value, also change BOOTFS_COMPRESS_VALID below */
129 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB
130 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF
131
132 #define BOOTFS_COMPRESS_VALID(compress) \
133 ((compress) == ZIO_COMPRESS_LZJB || \
134 (compress) == ZIO_COMPRESS_LZ4 || \
135 ((compress) == ZIO_COMPRESS_ON && \
136 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \
137 (compress) == ZIO_COMPRESS_OFF)
138
139 #define ZIO_FAILURE_MODE_WAIT 0
140 #define ZIO_FAILURE_MODE_CONTINUE 1
141 #define ZIO_FAILURE_MODE_PANIC 2
142
143 typedef enum zio_priority {
144 ZIO_PRIORITY_SYNC_READ,
145 ZIO_PRIORITY_SYNC_WRITE, /* ZIL */
146 ZIO_PRIORITY_ASYNC_READ, /* prefetch */
147 ZIO_PRIORITY_ASYNC_WRITE, /* spa_sync() */
148 ZIO_PRIORITY_SCRUB, /* asynchronous scrub/resilver reads */
149 ZIO_PRIORITY_NUM_QUEUEABLE,
150
151 ZIO_PRIORITY_NOW /* non-queued i/os (e.g. free) */
152 } zio_priority_t;
153
154 #define ZIO_PIPELINE_CONTINUE 0x100
155 #define ZIO_PIPELINE_STOP 0x101
156
157 enum zio_flag {
158 /*
159 * Flags inherited by gang, ddt, and vdev children,
160 * and that must be equal for two zios to aggregate
161 */
162 ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
163 ZIO_FLAG_IO_REPAIR = 1 << 1,
164 ZIO_FLAG_SELF_HEAL = 1 << 2,
165 ZIO_FLAG_RESILVER = 1 << 3,
166 ZIO_FLAG_SCRUB = 1 << 4,
167 ZIO_FLAG_SCAN_THREAD = 1 << 5,
168 ZIO_FLAG_PHYSICAL = 1 << 6,
169
170 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
171
172 /*
173 * Flags inherited by ddt, gang, and vdev children.
174 */
175 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */
176 ZIO_FLAG_SPECULATIVE = 1 << 8,
177 ZIO_FLAG_CONFIG_WRITER = 1 << 9,
178 ZIO_FLAG_DONT_RETRY = 1 << 10,
179 ZIO_FLAG_DONT_CACHE = 1 << 11,
180 ZIO_FLAG_NODATA = 1 << 12,
181 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13,
182
183 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
184 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)
185
186 /*
187 * Flags inherited by vdev children.
188 */
189 ZIO_FLAG_IO_RETRY = 1 << 14, /* must be first for INHERIT */
190 ZIO_FLAG_PROBE = 1 << 15,
191 ZIO_FLAG_TRYHARD = 1 << 16,
192 ZIO_FLAG_OPTIONAL = 1 << 17,
193
194 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
195
196 /*
197 * Flags not inherited by any children.
198 */
199 ZIO_FLAG_DONT_QUEUE = 1 << 18, /* must be first for INHERIT */
200 ZIO_FLAG_DONT_PROPAGATE = 1 << 19,
201 ZIO_FLAG_IO_BYPASS = 1 << 20,
202 ZIO_FLAG_IO_REWRITE = 1 << 21,
203 ZIO_FLAG_RAW = 1 << 22,
204 ZIO_FLAG_GANG_CHILD = 1 << 23,
205 ZIO_FLAG_DDT_CHILD = 1 << 24,
206 ZIO_FLAG_GODFATHER = 1 << 25,
207 ZIO_FLAG_NOPWRITE = 1 << 26,
208 ZIO_FLAG_REEXECUTED = 1 << 27,
209 ZIO_FLAG_DELEGATED = 1 << 28,
210 };
211
212 #define ZIO_FLAG_MUSTSUCCEED 0
213
214 #define ZIO_DDT_CHILD_FLAGS(zio) \
215 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \
216 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
217
218 #define ZIO_GANG_CHILD_FLAGS(zio) \
219 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \
220 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
221
222 #define ZIO_VDEV_CHILD_FLAGS(zio) \
223 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \
224 ZIO_FLAG_CANFAIL)
225
226 enum zio_child {
227 ZIO_CHILD_VDEV = 0,
228 ZIO_CHILD_GANG,
229 ZIO_CHILD_DDT,
230 ZIO_CHILD_LOGICAL,
231 ZIO_CHILD_TYPES
232 };
233
234 enum zio_wait_type {
235 ZIO_WAIT_READY = 0,
236 ZIO_WAIT_DONE,
237 ZIO_WAIT_TYPES
238 };
239
240 /*
241 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
242 * graveyard) to indicate checksum errors and fragmentation.
243 */
244 #define ECKSUM EBADE
245 #define EFRAGS EBADR
246
247 typedef void zio_done_func_t(zio_t *zio);
248
249 extern const char *zio_type_name[ZIO_TYPES];
250
251 /*
252 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
253 * identifies any block in the pool. By convention, the meta-objset (MOS)
254 * is objset 0, and the meta-dnode is object 0. This covers all blocks
255 * except root blocks and ZIL blocks, which are defined as follows:
256 *
257 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
258 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
259 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
260 *
261 * Note: this structure is called a bookmark because its original purpose
262 * was to remember where to resume a pool-wide traverse.
263 *
264 * Note: this structure is passed between userland and the kernel, and is
265 * stored on disk (by virtue of being incorporated into other on-disk
266 * structures, e.g. dsl_scan_phys_t).
267 */
268 typedef struct zbookmark_phys {
269 uint64_t zb_objset;
270 uint64_t zb_object;
271 int64_t zb_level;
272 uint64_t zb_blkid;
273 } zbookmark_phys_t;
274
275 #define SET_BOOKMARK(zb, objset, object, level, blkid) \
276 { \
277 (zb)->zb_objset = objset; \
278 (zb)->zb_object = object; \
279 (zb)->zb_level = level; \
280 (zb)->zb_blkid = blkid; \
281 }
282
283 #define ZB_DESTROYED_OBJSET (-1ULL)
284
285 #define ZB_ROOT_OBJECT (0ULL)
286 #define ZB_ROOT_LEVEL (-1LL)
287 #define ZB_ROOT_BLKID (0ULL)
288
289 #define ZB_ZIL_OBJECT (0ULL)
290 #define ZB_ZIL_LEVEL (-2LL)
291
292 #define ZB_IS_ZERO(zb) \
293 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \
294 (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
295 #define ZB_IS_ROOT(zb) \
296 ((zb)->zb_object == ZB_ROOT_OBJECT && \
297 (zb)->zb_level == ZB_ROOT_LEVEL && \
298 (zb)->zb_blkid == ZB_ROOT_BLKID)
299
300 typedef struct zio_prop {
301 enum zio_checksum zp_checksum;
302 enum zio_compress zp_compress;
303 dmu_object_type_t zp_type;
304 uint8_t zp_level;
305 uint8_t zp_copies;
306 boolean_t zp_dedup;
307 boolean_t zp_dedup_verify;
308 boolean_t zp_nopwrite;
309 boolean_t zp_zero_write;
310 } zio_prop_t;
311
312 typedef struct zio_cksum_report zio_cksum_report_t;
313
314 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
315 const void *good_data);
316 typedef void zio_cksum_free_f(void *cbdata, size_t size);
317
318 struct zio_bad_cksum; /* defined in zio_checksum.h */
319 struct dnode_phys;
320
321 struct zio_cksum_report {
322 struct zio_cksum_report *zcr_next;
323 nvlist_t *zcr_ereport;
324 nvlist_t *zcr_detector;
325 void *zcr_cbdata;
326 size_t zcr_cbinfo; /* passed to zcr_free() */
327 uint64_t zcr_align;
328 uint64_t zcr_length;
329 zio_cksum_finish_f *zcr_finish;
330 zio_cksum_free_f *zcr_free;
331
332 /* internal use only */
333 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */
334 };
335
336 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
337 void *arg);
338
339 zio_vsd_cksum_report_f zio_vsd_default_cksum_report;
340
341 typedef struct zio_vsd_ops {
342 zio_done_func_t *vsd_free;
343 zio_vsd_cksum_report_f *vsd_cksum_report;
344 } zio_vsd_ops_t;
345
346 typedef struct zio_gang_node {
347 zio_gbh_phys_t *gn_gbh;
348 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
349 } zio_gang_node_t;
350
351 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
352 zio_gang_node_t *gn, void *data);
353
354 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
355
356 typedef struct zio_transform {
357 void *zt_orig_data;
358 uint64_t zt_orig_size;
359 uint64_t zt_bufsize;
360 zio_transform_func_t *zt_transform;
361 struct zio_transform *zt_next;
362 } zio_transform_t;
363
364 typedef int zio_pipe_stage_t(zio_t *zio);
365
366 /*
367 * The io_reexecute flags are distinct from io_flags because the child must
368 * be able to propagate them to the parent. The normal io_flags are local
369 * to the zio, not protected by any lock, and not modifiable by children;
370 * the reexecute flags are protected by io_lock, modifiable by children,
371 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
372 */
373 #define ZIO_REEXECUTE_NOW 0x01
374 #define ZIO_REEXECUTE_SUSPEND 0x02
375
376 typedef struct zio_link {
377 zio_t *zl_parent;
378 zio_t *zl_child;
379 list_node_t zl_parent_node;
380 list_node_t zl_child_node;
381 } zio_link_t;
382
383 struct zio {
384 /* Core information about this I/O */
385 zbookmark_phys_t io_bookmark;
386 zio_prop_t io_prop;
387 zio_type_t io_type;
388 enum zio_child io_child_type;
389 int io_cmd;
390 zio_priority_t io_priority;
391 uint8_t io_reexecute;
392 uint8_t io_state[ZIO_WAIT_TYPES];
393 uint64_t io_txg;
394 spa_t *io_spa;
395 blkptr_t *io_bp;
396 blkptr_t *io_bp_override;
397 blkptr_t io_bp_copy;
398 list_t io_parent_list;
399 list_t io_child_list;
400 zio_link_t *io_walk_link;
401 zio_t *io_logical;
402 zio_transform_t *io_transform_stack;
403
404 /* Callback info */
405 zio_done_func_t *io_ready;
406 zio_done_func_t *io_physdone;
407 zio_done_func_t *io_done;
408 void *io_private;
409 int64_t io_prev_space_delta; /* DMU private */
410 blkptr_t io_bp_orig;
411
412 /* Data represented by this I/O */
413 void *io_data;
414 void *io_orig_data;
415 uint64_t io_size;
416 uint64_t io_orig_size;
417
418 /* Stuff for the vdev stack */
419 vdev_t *io_vd;
420 void *io_vsd;
421 const zio_vsd_ops_t *io_vsd_ops;
422
423 uint64_t io_offset;
424 hrtime_t io_timestamp;
425 avl_node_t io_queue_node;
426
427 /* Internal pipeline state */
428 enum zio_flag io_flags;
429 enum zio_stage io_stage;
430 enum zio_stage io_pipeline;
431 enum zio_flag io_orig_flags;
432 enum zio_stage io_orig_stage;
433 enum zio_stage io_orig_pipeline;
434 int io_error;
435 int io_child_error[ZIO_CHILD_TYPES];
436 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
437 uint64_t io_child_count;
438 uint64_t io_phys_children;
439 uint64_t io_parent_count;
440 uint64_t *io_stall;
441 zio_t *io_gang_leader;
442 zio_gang_node_t *io_gang_tree;
443 void *io_executor;
444 void *io_waiter;
445 kmutex_t io_lock;
446 kcondvar_t io_cv;
447
448 /* FMA state */
449 zio_cksum_report_t *io_cksum_report;
450 uint64_t io_ena;
451
452 /* Taskq dispatching state */
453 taskq_ent_t io_tqent;
454 };
455
456 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
457 zio_done_func_t *done, void *private, enum zio_flag flags);
458
459 extern zio_t *zio_root(spa_t *spa,
460 zio_done_func_t *done, void *private, enum zio_flag flags);
461
462 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
463 uint64_t size, zio_done_func_t *done, void *private,
464 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);
465
466 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
467 void *data, uint64_t size, const zio_prop_t *zp,
468 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done,
469 void *private,
470 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);
471
472 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
473 void *data, uint64_t size, zio_done_func_t *done, void *private,
474 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb);
475
476 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
477 boolean_t nopwrite);
478
479 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
480
481 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
482 const blkptr_t *bp,
483 zio_done_func_t *done, void *private, enum zio_flag flags);
484
485 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
486 zio_done_func_t *done, void *private, enum zio_flag flags);
487
488 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
489 uint64_t size, void *data, int checksum,
490 zio_done_func_t *done, void *private, zio_priority_t priority,
491 enum zio_flag flags, boolean_t labels);
492
493 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
494 uint64_t size, void *data, int checksum,
495 zio_done_func_t *done, void *private, zio_priority_t priority,
496 enum zio_flag flags, boolean_t labels);
497
498 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
499 const blkptr_t *bp, enum zio_flag flags);
500
501 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
502 blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
503 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
504 extern void zio_flush(zio_t *zio, vdev_t *vd);
505 extern void zio_shrink(zio_t *zio, uint64_t size);
506
507 extern int zio_wait(zio_t *zio);
508 extern void zio_nowait(zio_t *zio);
509 extern void zio_execute(zio_t *zio);
510 extern void zio_interrupt(zio_t *zio);
511
512 extern zio_t *zio_walk_parents(zio_t *cio);
513 extern zio_t *zio_walk_children(zio_t *pio);
514 extern zio_t *zio_unique_parent(zio_t *cio);
515 extern void zio_add_child(zio_t *pio, zio_t *cio);
516
517 extern void *zio_buf_alloc(size_t size);
518 extern void zio_buf_free(void *buf, size_t size);
519 extern void *zio_data_buf_alloc(size_t size);
520 extern void zio_data_buf_free(void *buf, size_t size);
521
522 extern void zio_resubmit_stage_async(void *);
523
524 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
525 uint64_t offset, void *data, uint64_t size, int type,
526 zio_priority_t priority, enum zio_flag flags,
527 zio_done_func_t *done, void *private);
528
529 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
530 void *data, uint64_t size, int type, zio_priority_t priority,
531 enum zio_flag flags, zio_done_func_t *done, void *private);
532
533 extern void zio_vdev_io_bypass(zio_t *zio);
534 extern void zio_vdev_io_reissue(zio_t *zio);
535 extern void zio_vdev_io_redone(zio_t *zio);
536
537 extern void zio_checksum_verified(zio_t *zio);
538 extern int zio_worst_error(int e1, int e2);
539
540 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
541 enum zio_checksum parent);
542 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
543 enum zio_checksum child, enum zio_checksum parent);
544 extern enum zio_compress zio_compress_select(enum zio_compress child,
545 enum zio_compress parent);
546
547 extern void zio_suspend(spa_t *spa, zio_t *zio);
548 extern int zio_resume(spa_t *spa);
549 extern void zio_resume_wait(spa_t *spa);
550
551 /*
552 * Initial setup and teardown.
553 */
554 extern void zio_init(void);
555 extern void zio_fini(void);
556
557 /*
558 * Fault injection
559 */
560 struct zinject_record;
561 extern uint32_t zio_injection_enabled;
562 extern int zio_inject_fault(char *name, int flags, int *id,
563 struct zinject_record *record);
564 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
565 struct zinject_record *record);
566 extern int zio_clear_fault(int id);
567 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
568 extern int zio_handle_fault_injection(zio_t *zio, int error);
569 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
570 extern int zio_handle_label_injection(zio_t *zio, int error);
571 extern void zio_handle_ignored_writes(zio_t *zio);
572 extern uint64_t zio_handle_io_delay(zio_t *zio);
573
574 /*
575 * Checksum ereport functions
576 */
577 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
578 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
579 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
580 const void *good_data, const void *bad_data, boolean_t drop_if_identical);
581
582 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
583 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
584
585 /* If we have the good data in hand, this function can be used */
586 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
587 struct zio *zio, uint64_t offset, uint64_t length,
588 const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
589
590 /* Called from spa_sync(), but primarily an injection handler */
591 extern void spa_handle_ignored_writes(spa_t *spa);
592
593 /* zbookmark_phys functions */
594 boolean_t zbookmark_is_before(const struct dnode_phys *dnp,
595 const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2);
596
597 #ifdef __cplusplus
598 }
599 #endif
600
601 #endif /* _ZIO_H */