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