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_LZ4HC,
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_LZ4HC || \
122 (compress) == ZIO_COMPRESS_LZ4 || \
123 ((compress) == ZIO_COMPRESS_ON && \
124 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \
125 (compress) == ZIO_COMPRESS_OFF)
126
127 #define ZIO_FAILURE_MODE_WAIT 0
128 #define ZIO_FAILURE_MODE_CONTINUE 1
129 #define ZIO_FAILURE_MODE_PANIC 2
130
131 #define ZIO_PRIORITY_NOW (zio_priority_table[0])
132 #define ZIO_PRIORITY_SYNC_READ (zio_priority_table[1])
133 #define ZIO_PRIORITY_SYNC_WRITE (zio_priority_table[2])
134 #define ZIO_PRIORITY_LOG_WRITE (zio_priority_table[3])
135 #define ZIO_PRIORITY_CACHE_FILL (zio_priority_table[4])
136 #define ZIO_PRIORITY_AGG (zio_priority_table[5])
137 #define ZIO_PRIORITY_FREE (zio_priority_table[6])
138 #define ZIO_PRIORITY_ASYNC_WRITE (zio_priority_table[7])
139 #define ZIO_PRIORITY_ASYNC_READ (zio_priority_table[8])
140 #define ZIO_PRIORITY_RESILVER (zio_priority_table[9])
141 #define ZIO_PRIORITY_SCRUB (zio_priority_table[10])
142 #define ZIO_PRIORITY_DDT_PREFETCH (zio_priority_table[11])
143 #define ZIO_PRIORITY_TABLE_SIZE 12
144
145 #define ZIO_PIPELINE_CONTINUE 0x100
146 #define ZIO_PIPELINE_STOP 0x101
147
148 enum zio_flag {
149 /*
150 * Flags inherited by gang, ddt, and vdev children,
151 * and that must be equal for two zios to aggregate
152 */
153 ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
154 ZIO_FLAG_IO_REPAIR = 1 << 1,
155 ZIO_FLAG_SELF_HEAL = 1 << 2,
156 ZIO_FLAG_RESILVER = 1 << 3,
157 ZIO_FLAG_SCRUB = 1 << 4,
158 ZIO_FLAG_SCAN_THREAD = 1 << 5,
159
160 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
161
162 /*
163 * Flags inherited by ddt, gang, and vdev children.
164 */
165 ZIO_FLAG_CANFAIL = 1 << 6, /* must be first for INHERIT */
166 ZIO_FLAG_SPECULATIVE = 1 << 7,
167 ZIO_FLAG_CONFIG_WRITER = 1 << 8,
168 ZIO_FLAG_DONT_RETRY = 1 << 9,
169 ZIO_FLAG_DONT_CACHE = 1 << 10,
170 ZIO_FLAG_NODATA = 1 << 11,
171 ZIO_FLAG_INDUCE_DAMAGE = 1 << 12,
172
173 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
174 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)
175
176 /*
177 * Flags inherited by vdev children.
178 */
179 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */
180 ZIO_FLAG_PROBE = 1 << 14,
181 ZIO_FLAG_TRYHARD = 1 << 15,
182 ZIO_FLAG_OPTIONAL = 1 << 16,
183
184 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
185
186 /*
187 * Flags not inherited by any children.
188 */
189 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */
190 ZIO_FLAG_DONT_PROPAGATE = 1 << 18,
191 ZIO_FLAG_IO_BYPASS = 1 << 19,
192 ZIO_FLAG_IO_REWRITE = 1 << 20,
193 ZIO_FLAG_RAW = 1 << 21,
194 ZIO_FLAG_GANG_CHILD = 1 << 22,
195 ZIO_FLAG_DDT_CHILD = 1 << 23,
196 ZIO_FLAG_GODFATHER = 1 << 24,
197 ZIO_FLAG_NOPWRITE = 1 << 25,
198 ZIO_FLAG_REEXECUTED = 1 << 26,
199 };
200
201 #define ZIO_FLAG_MUSTSUCCEED 0
202
203 #define ZIO_DDT_CHILD_FLAGS(zio) \
204 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \
205 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
206
207 #define ZIO_GANG_CHILD_FLAGS(zio) \
208 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \
209 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
210
211 #define ZIO_VDEV_CHILD_FLAGS(zio) \
212 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \
213 ZIO_FLAG_CANFAIL)
214
215 enum zio_child {
216 ZIO_CHILD_VDEV = 0,
217 ZIO_CHILD_GANG,
218 ZIO_CHILD_DDT,
219 ZIO_CHILD_LOGICAL,
220 ZIO_CHILD_TYPES
221 };
222
223 enum zio_wait_type {
224 ZIO_WAIT_READY = 0,
225 ZIO_WAIT_DONE,
226 ZIO_WAIT_TYPES
227 };
228
229 /*
230 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
231 * graveyard) to indicate checksum errors and fragmentation.
232 */
233 #define ECKSUM EBADE
234 #define EFRAGS EBADR
235
236 typedef void zio_done_func_t(zio_t *zio);
237
238 extern uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE];
239 extern char *zio_type_name[ZIO_TYPES];
240
241 /*
242 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
243 * identifies any block in the pool. By convention, the meta-objset (MOS)
244 * is objset 0, and the meta-dnode is object 0. This covers all blocks
245 * except root blocks and ZIL blocks, which are defined as follows:
246 *
247 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
248 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
249 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
250 *
251 * Note: this structure is called a bookmark because its original purpose
252 * was to remember where to resume a pool-wide traverse.
253 *
254 * Note: this structure is passed between userland and the kernel.
255 * Therefore it must not change size or alignment between 32/64 bit
256 * compilation options.
257 */
258 typedef struct zbookmark {
259 uint64_t zb_objset;
260 uint64_t zb_object;
261 int64_t zb_level;
262 uint64_t zb_blkid;
263 } zbookmark_t;
264
265 #define SET_BOOKMARK(zb, objset, object, level, blkid) \
266 { \
267 (zb)->zb_objset = objset; \
268 (zb)->zb_object = object; \
269 (zb)->zb_level = level; \
270 (zb)->zb_blkid = blkid; \
271 }
272
273 #define ZB_DESTROYED_OBJSET (-1ULL)
274
275 #define ZB_ROOT_OBJECT (0ULL)
276 #define ZB_ROOT_LEVEL (-1LL)
277 #define ZB_ROOT_BLKID (0ULL)
278
279 #define ZB_ZIL_OBJECT (0ULL)
280 #define ZB_ZIL_LEVEL (-2LL)
281
282 #define ZB_IS_ZERO(zb) \
283 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \
284 (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
285 #define ZB_IS_ROOT(zb) \
286 ((zb)->zb_object == ZB_ROOT_OBJECT && \
287 (zb)->zb_level == ZB_ROOT_LEVEL && \
288 (zb)->zb_blkid == ZB_ROOT_BLKID)
289
290 typedef struct zio_prop {
291 enum zio_checksum zp_checksum;
292 enum zio_compress zp_compress;
293 dmu_object_type_t zp_type;
294 uint8_t zp_level;
295 uint8_t zp_copies;
296 boolean_t zp_dedup;
297 boolean_t zp_dedup_verify;
298 boolean_t zp_nopwrite;
299 } zio_prop_t;
300
301 typedef struct zio_cksum_report zio_cksum_report_t;
302
303 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
304 const void *good_data);
305 typedef void zio_cksum_free_f(void *cbdata, size_t size);
306
307 struct zio_bad_cksum; /* defined in zio_checksum.h */
308 struct dnode_phys;
309
310 struct zio_cksum_report {
311 struct zio_cksum_report *zcr_next;
312 nvlist_t *zcr_ereport;
313 nvlist_t *zcr_detector;
314 void *zcr_cbdata;
315 size_t zcr_cbinfo; /* passed to zcr_free() */
316 uint64_t zcr_align;
317 uint64_t zcr_length;
318 zio_cksum_finish_f *zcr_finish;
319 zio_cksum_free_f *zcr_free;
320
321 /* internal use only */
322 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */
323 };
324
325 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
326 void *arg);
327
328 zio_vsd_cksum_report_f zio_vsd_default_cksum_report;
329
330 typedef struct zio_vsd_ops {
331 zio_done_func_t *vsd_free;
332 zio_vsd_cksum_report_f *vsd_cksum_report;
333 } zio_vsd_ops_t;
334
335 typedef struct zio_gang_node {
336 zio_gbh_phys_t *gn_gbh;
337 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
338 } zio_gang_node_t;
339
340 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
341 zio_gang_node_t *gn, void *data);
342
343 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
344
345 typedef struct zio_transform {
346 void *zt_orig_data;
347 uint64_t zt_orig_size;
348 uint64_t zt_bufsize;
349 zio_transform_func_t *zt_transform;
350 struct zio_transform *zt_next;
351 } zio_transform_t;
352
353 typedef int zio_pipe_stage_t(zio_t *zio);
354
355 /*
356 * The io_reexecute flags are distinct from io_flags because the child must
357 * be able to propagate them to the parent. The normal io_flags are local
358 * to the zio, not protected by any lock, and not modifiable by children;
359 * the reexecute flags are protected by io_lock, modifiable by children,
360 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
361 */
362 #define ZIO_REEXECUTE_NOW 0x01
363 #define ZIO_REEXECUTE_SUSPEND 0x02
364
365 typedef struct zio_link {
366 zio_t *zl_parent;
367 zio_t *zl_child;
368 list_node_t zl_parent_node;
369 list_node_t zl_child_node;
370 } zio_link_t;
371
372 struct zio {
373 /* Core information about this I/O */
374 zbookmark_t io_bookmark;
375 zio_prop_t io_prop;
376 zio_type_t io_type;
377 enum zio_child io_child_type;
378 int io_cmd;
379 uint8_t io_priority;
380 uint8_t io_reexecute;
381 uint8_t io_state[ZIO_WAIT_TYPES];
382 uint64_t io_txg;
383 spa_t *io_spa;
384 blkptr_t *io_bp;
385 blkptr_t *io_bp_override;
386 blkptr_t io_bp_copy;
387 list_t io_parent_list;
388 list_t io_child_list;
389 zio_link_t *io_walk_link;
390 zio_t *io_logical;
391 zio_transform_t *io_transform_stack;
392
393 /* Callback info */
394 zio_done_func_t *io_ready;
395 zio_done_func_t *io_done;
396 void *io_private;
397 int64_t io_prev_space_delta; /* DMU private */
398 blkptr_t io_bp_orig;
399
400 /* Data represented by this I/O */
401 void *io_data;
402 void *io_orig_data;
403 uint64_t io_size;
404 uint64_t io_orig_size;
405
406 /* Stuff for the vdev stack */
407 vdev_t *io_vd;
408 void *io_vsd;
409 const zio_vsd_ops_t *io_vsd_ops;
410
411 uint64_t io_offset;
412 uint64_t io_deadline;
413 uint64_t io_timestamp;
414 avl_node_t io_offset_node;
415 avl_node_t io_deadline_node;
416 avl_tree_t *io_vdev_tree;
417
418 /* Internal pipeline state */
419 enum zio_flag io_flags;
420 enum zio_stage io_stage;
421 enum zio_stage io_pipeline;
422 enum zio_flag io_orig_flags;
423 enum zio_stage io_orig_stage;
424 enum zio_stage io_orig_pipeline;
425 int io_error;
426 int io_child_error[ZIO_CHILD_TYPES];
427 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
428 uint64_t io_child_count;
429 uint64_t io_parent_count;
430 uint64_t *io_stall;
431 zio_t *io_gang_leader;
432 zio_gang_node_t *io_gang_tree;
433 void *io_executor;
434 void *io_waiter;
435 kmutex_t io_lock;
436 kcondvar_t io_cv;
437
438 /* FMA state */
439 zio_cksum_report_t *io_cksum_report;
440 uint64_t io_ena;
441
442 /* Taskq dispatching state */
443 taskq_ent_t io_tqent;
444 };
445
446 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
447 zio_done_func_t *done, void *private, enum zio_flag flags);
448
449 extern zio_t *zio_root(spa_t *spa,
450 zio_done_func_t *done, void *private, enum zio_flag flags);
451
452 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
453 uint64_t size, zio_done_func_t *done, void *private,
454 int priority, enum zio_flag flags, const zbookmark_t *zb);
455
456 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
457 void *data, uint64_t size, const zio_prop_t *zp,
458 zio_done_func_t *ready, zio_done_func_t *done, void *private,
459 int priority, enum zio_flag flags, const zbookmark_t *zb);
460
461 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
462 void *data, uint64_t size, zio_done_func_t *done, void *private,
463 int priority, enum zio_flag flags, zbookmark_t *zb);
464
465 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
466 boolean_t nopwrite);
467
468 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
469
470 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
471 const blkptr_t *bp,
472 zio_done_func_t *done, void *private, enum zio_flag flags);
473
474 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
475 zio_done_func_t *done, void *private, int priority, enum zio_flag flags);
476
477 extern zio_t *zio_read_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, int priority, enum zio_flag flags,
480 boolean_t labels);
481
482 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
483 uint64_t size, void *data, int checksum,
484 zio_done_func_t *done, void *private, int priority, enum zio_flag flags,
485 boolean_t labels);
486
487 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
488 const blkptr_t *bp, enum zio_flag flags);
489
490 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
491 blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
492 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
493 extern void zio_flush(zio_t *zio, vdev_t *vd);
494 extern void zio_shrink(zio_t *zio, uint64_t size);
495
496 extern int zio_wait(zio_t *zio);
497 extern void zio_nowait(zio_t *zio);
498 extern void zio_execute(zio_t *zio);
499 extern void zio_interrupt(zio_t *zio);
500
501 extern zio_t *zio_walk_parents(zio_t *cio);
502 extern zio_t *zio_walk_children(zio_t *pio);
503 extern zio_t *zio_unique_parent(zio_t *cio);
504 extern void zio_add_child(zio_t *pio, zio_t *cio);
505
506 extern void *zio_buf_alloc(size_t size);
507 extern void zio_buf_free(void *buf, size_t size);
508 extern void *zio_data_buf_alloc(size_t size);
509 extern void zio_data_buf_free(void *buf, size_t size);
510
511 extern void zio_resubmit_stage_async(void *);
512
513 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
514 uint64_t offset, void *data, uint64_t size, int type, int priority,
515 enum zio_flag flags, zio_done_func_t *done, void *private);
516
517 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
518 void *data, uint64_t size, int type, int priority,
519 enum zio_flag flags, zio_done_func_t *done, void *private);
520
521 extern void zio_vdev_io_bypass(zio_t *zio);
522 extern void zio_vdev_io_reissue(zio_t *zio);
523 extern void zio_vdev_io_redone(zio_t *zio);
524
525 extern void zio_checksum_verified(zio_t *zio);
526 extern int zio_worst_error(int e1, int e2);
527
528 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
529 enum zio_checksum parent);
530 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
531 enum zio_checksum child, enum zio_checksum parent);
532 extern enum zio_compress zio_compress_select(enum zio_compress child,
533 enum zio_compress parent);
534
535 extern void zio_suspend(spa_t *spa, zio_t *zio);
536 extern int zio_resume(spa_t *spa);
537 extern void zio_resume_wait(spa_t *spa);
538
539 /*
540 * Initial setup and teardown.
541 */
542 extern void zio_init(void);
543 extern void zio_fini(void);
544
545 /*
546 * Fault injection
547 */
548 struct zinject_record;
549 extern uint32_t zio_injection_enabled;
550 extern int zio_inject_fault(char *name, int flags, int *id,
551 struct zinject_record *record);
552 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
553 struct zinject_record *record);
554 extern int zio_clear_fault(int id);
555 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
556 extern int zio_handle_fault_injection(zio_t *zio, int error);
557 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
558 extern int zio_handle_label_injection(zio_t *zio, int error);
559 extern void zio_handle_ignored_writes(zio_t *zio);
560 extern uint64_t zio_handle_io_delay(zio_t *zio);
561
562 /*
563 * Checksum ereport functions
564 */
565 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
566 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
567 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
568 const void *good_data, const void *bad_data, boolean_t drop_if_identical);
569
570 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
571 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
572
573 /* If we have the good data in hand, this function can be used */
574 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
575 struct zio *zio, uint64_t offset, uint64_t length,
576 const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
577
578 /* Called from spa_sync(), but primarily an injection handler */
579 extern void spa_handle_ignored_writes(spa_t *spa);
580
581 /* zbookmark functions */
582 boolean_t zbookmark_is_before(const struct dnode_phys *dnp,
583 const zbookmark_t *zb1, const zbookmark_t *zb2);
584
585 #ifdef __cplusplus
586 }
587 #endif
588
589 #endif /* _ZIO_H */