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 */
25 /*
26 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
27 * Copyright (c) 2012 by Delphix. 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_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_FUNCTIONS
112 };
113
114 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB
115 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF
116
117 #define BOOTFS_COMPRESS_VALID(compress) \
118 ((compress) == ZIO_COMPRESS_LZJB || \
119 ((compress) == ZIO_COMPRESS_ON && \
120 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \
121 (compress) == ZIO_COMPRESS_OFF)
122
123 #define ZIO_FAILURE_MODE_WAIT 0
124 #define ZIO_FAILURE_MODE_CONTINUE 1
125 #define ZIO_FAILURE_MODE_PANIC 2
126
127 #define ZIO_PRIORITY_NOW (zio_priority_table[0])
128 #define ZIO_PRIORITY_SYNC_READ (zio_priority_table[1])
129 #define ZIO_PRIORITY_SYNC_WRITE (zio_priority_table[2])
130 #define ZIO_PRIORITY_LOG_WRITE (zio_priority_table[3])
131 #define ZIO_PRIORITY_CACHE_FILL (zio_priority_table[4])
132 #define ZIO_PRIORITY_AGG (zio_priority_table[5])
133 #define ZIO_PRIORITY_FREE (zio_priority_table[6])
134 #define ZIO_PRIORITY_ASYNC_WRITE (zio_priority_table[7])
135 #define ZIO_PRIORITY_ASYNC_READ (zio_priority_table[8])
136 #define ZIO_PRIORITY_RESILVER (zio_priority_table[9])
137 #define ZIO_PRIORITY_SCRUB (zio_priority_table[10])
138 #define ZIO_PRIORITY_DDT_PREFETCH (zio_priority_table[11])
139 #define ZIO_PRIORITY_TABLE_SIZE 12
140
141 #define ZIO_PIPELINE_CONTINUE 0x100
142 #define ZIO_PIPELINE_STOP 0x101
143
144 enum zio_flag {
145 /*
146 * Flags inherited by gang, ddt, and vdev children,
147 * and that must be equal for two zios to aggregate
148 */
149 ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
150 ZIO_FLAG_IO_REPAIR = 1 << 1,
151 ZIO_FLAG_SELF_HEAL = 1 << 2,
152 ZIO_FLAG_RESILVER = 1 << 3,
153 ZIO_FLAG_SCRUB = 1 << 4,
154 ZIO_FLAG_SCAN_THREAD = 1 << 5,
155
156 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
157
158 /*
159 * Flags inherited by ddt, gang, and vdev children.
160 */
161 ZIO_FLAG_CANFAIL = 1 << 6, /* must be first for INHERIT */
162 ZIO_FLAG_SPECULATIVE = 1 << 7,
163 ZIO_FLAG_CONFIG_WRITER = 1 << 8,
164 ZIO_FLAG_DONT_RETRY = 1 << 9,
165 ZIO_FLAG_DONT_CACHE = 1 << 10,
166 ZIO_FLAG_NODATA = 1 << 11,
167 ZIO_FLAG_INDUCE_DAMAGE = 1 << 12,
168
169 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
170 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)
171
172 /*
173 * Flags inherited by vdev children.
174 */
175 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */
176 ZIO_FLAG_PROBE = 1 << 14,
177 ZIO_FLAG_TRYHARD = 1 << 15,
178 ZIO_FLAG_OPTIONAL = 1 << 16,
179
180 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
181
182 /*
183 * Flags not inherited by any children.
184 */
185 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */
186 ZIO_FLAG_DONT_PROPAGATE = 1 << 18,
187 ZIO_FLAG_IO_BYPASS = 1 << 19,
188 ZIO_FLAG_IO_REWRITE = 1 << 20,
189 ZIO_FLAG_RAW = 1 << 21,
190 ZIO_FLAG_GANG_CHILD = 1 << 22,
191 ZIO_FLAG_DDT_CHILD = 1 << 23,
192 ZIO_FLAG_GODFATHER = 1 << 24
193 };
194
195 #define ZIO_FLAG_MUSTSUCCEED 0
196
197 #define ZIO_DDT_CHILD_FLAGS(zio) \
198 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \
199 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
200
201 #define ZIO_GANG_CHILD_FLAGS(zio) \
202 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \
203 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
204
205 #define ZIO_VDEV_CHILD_FLAGS(zio) \
206 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \
207 ZIO_FLAG_CANFAIL)
208
209 enum zio_child {
210 ZIO_CHILD_VDEV = 0,
211 ZIO_CHILD_GANG,
212 ZIO_CHILD_DDT,
213 ZIO_CHILD_LOGICAL,
214 ZIO_CHILD_TYPES
215 };
216
217 enum zio_wait_type {
218 ZIO_WAIT_READY = 0,
219 ZIO_WAIT_DONE,
220 ZIO_WAIT_TYPES
221 };
222
223 /*
224 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
225 * graveyard) to indicate checksum errors and fragmentation.
226 */
227 #define ECKSUM EBADE
228 #define EFRAGS EBADR
229
230 typedef void zio_done_func_t(zio_t *zio);
231
232 extern uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE];
233 extern char *zio_type_name[ZIO_TYPES];
234
235 /*
236 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
237 * identifies any block in the pool. By convention, the meta-objset (MOS)
238 * is objset 0, and the meta-dnode is object 0. This covers all blocks
239 * except root blocks and ZIL blocks, which are defined as follows:
240 *
241 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
242 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
243 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
244 *
245 * Note: this structure is called a bookmark because its original purpose
246 * was to remember where to resume a pool-wide traverse.
247 *
248 * Note: this structure is passed between userland and the kernel.
249 * Therefore it must not change size or alignment between 32/64 bit
250 * compilation options.
251 */
252 typedef struct zbookmark {
253 uint64_t zb_objset;
254 uint64_t zb_object;
255 int64_t zb_level;
256 uint64_t zb_blkid;
257 } zbookmark_t;
258
259 #define SET_BOOKMARK(zb, objset, object, level, blkid) \
260 { \
261 (zb)->zb_objset = objset; \
262 (zb)->zb_object = object; \
263 (zb)->zb_level = level; \
264 (zb)->zb_blkid = blkid; \
265 }
266
267 #define ZB_DESTROYED_OBJSET (-1ULL)
268
269 #define ZB_ROOT_OBJECT (0ULL)
270 #define ZB_ROOT_LEVEL (-1LL)
271 #define ZB_ROOT_BLKID (0ULL)
272
273 #define ZB_ZIL_OBJECT (0ULL)
274 #define ZB_ZIL_LEVEL (-2LL)
275
276 #define ZB_IS_ZERO(zb) \
277 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \
278 (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
279 #define ZB_IS_ROOT(zb) \
280 ((zb)->zb_object == ZB_ROOT_OBJECT && \
281 (zb)->zb_level == ZB_ROOT_LEVEL && \
282 (zb)->zb_blkid == ZB_ROOT_BLKID)
283
284 typedef struct zio_prop {
285 enum zio_checksum zp_checksum;
286 enum zio_compress zp_compress;
287 dmu_object_type_t zp_type;
288 uint8_t zp_level;
289 uint8_t zp_copies;
290 uint8_t zp_dedup;
291 uint8_t zp_dedup_verify;
292 } zio_prop_t;
293
294 typedef struct zio_cksum_report zio_cksum_report_t;
295
296 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
297 const void *good_data);
298 typedef void zio_cksum_free_f(void *cbdata, size_t size);
299
300 struct zio_bad_cksum; /* defined in zio_checksum.h */
301 struct dnode_phys;
302
303 struct zio_cksum_report {
304 struct zio_cksum_report *zcr_next;
305 nvlist_t *zcr_ereport;
306 nvlist_t *zcr_detector;
307 void *zcr_cbdata;
308 size_t zcr_cbinfo; /* passed to zcr_free() */
309 uint64_t zcr_align;
310 uint64_t zcr_length;
311 zio_cksum_finish_f *zcr_finish;
312 zio_cksum_free_f *zcr_free;
313
314 /* internal use only */
315 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */
316 };
317
318 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
319 void *arg);
320
321 zio_vsd_cksum_report_f zio_vsd_default_cksum_report;
322
323 typedef struct zio_vsd_ops {
324 zio_done_func_t *vsd_free;
325 zio_vsd_cksum_report_f *vsd_cksum_report;
326 } zio_vsd_ops_t;
327
328 typedef struct zio_gang_node {
329 zio_gbh_phys_t *gn_gbh;
330 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
331 } zio_gang_node_t;
332
333 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
334 zio_gang_node_t *gn, void *data);
335
336 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
337
338 typedef struct zio_transform {
339 void *zt_orig_data;
340 uint64_t zt_orig_size;
341 uint64_t zt_bufsize;
342 zio_transform_func_t *zt_transform;
343 struct zio_transform *zt_next;
344 } zio_transform_t;
345
346 typedef int zio_pipe_stage_t(zio_t *zio);
347
348 /*
349 * The io_reexecute flags are distinct from io_flags because the child must
350 * be able to propagate them to the parent. The normal io_flags are local
351 * to the zio, not protected by any lock, and not modifiable by children;
352 * the reexecute flags are protected by io_lock, modifiable by children,
353 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
354 */
355 #define ZIO_REEXECUTE_NOW 0x01
356 #define ZIO_REEXECUTE_SUSPEND 0x02
357
358 typedef struct zio_link {
359 zio_t *zl_parent;
360 zio_t *zl_child;
361 list_node_t zl_parent_node;
362 list_node_t zl_child_node;
363 } zio_link_t;
364
365 struct zio {
366 /* Core information about this I/O */
367 zbookmark_t io_bookmark;
368 zio_prop_t io_prop;
369 zio_type_t io_type;
370 enum zio_child io_child_type;
371 int io_cmd;
372 uint8_t io_priority;
373 uint8_t io_reexecute;
374 uint8_t io_state[ZIO_WAIT_TYPES];
375 uint64_t io_txg;
376 spa_t *io_spa;
377 blkptr_t *io_bp;
378 blkptr_t *io_bp_override;
379 blkptr_t io_bp_copy;
380 list_t io_parent_list;
381 list_t io_child_list;
382 zio_link_t *io_walk_link;
383 zio_t *io_logical;
384 zio_transform_t *io_transform_stack;
385
386 /* Callback info */
387 zio_done_func_t *io_ready;
388 zio_done_func_t *io_done;
389 void *io_private;
390 int64_t io_prev_space_delta; /* DMU private */
391 blkptr_t io_bp_orig;
392
393 /* Data represented by this I/O */
394 void *io_data;
395 void *io_orig_data;
396 uint64_t io_size;
397 uint64_t io_orig_size;
398
399 /* Stuff for the vdev stack */
400 vdev_t *io_vd;
401 void *io_vsd;
402 const zio_vsd_ops_t *io_vsd_ops;
403
404 uint64_t io_offset;
405 uint64_t io_deadline;
406 avl_node_t io_offset_node;
407 avl_node_t io_deadline_node;
408 avl_tree_t *io_vdev_tree;
409
410 /* Internal pipeline state */
411 enum zio_flag io_flags;
412 enum zio_stage io_stage;
413 enum zio_stage io_pipeline;
414 enum zio_flag io_orig_flags;
415 enum zio_stage io_orig_stage;
416 enum zio_stage io_orig_pipeline;
417 int io_error;
418 int io_child_error[ZIO_CHILD_TYPES];
419 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
420 uint64_t io_child_count;
421 uint64_t io_parent_count;
422 uint64_t *io_stall;
423 zio_t *io_gang_leader;
424 zio_gang_node_t *io_gang_tree;
425 void *io_executor;
426 void *io_waiter;
427 kmutex_t io_lock;
428 kcondvar_t io_cv;
429
430 /* FMA state */
431 zio_cksum_report_t *io_cksum_report;
432 uint64_t io_ena;
433
434 /* Taskq dispatching state */
435 taskq_ent_t io_tqent;
436 };
437
438 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
439 zio_done_func_t *done, void *private, enum zio_flag flags);
440
441 extern zio_t *zio_root(spa_t *spa,
442 zio_done_func_t *done, void *private, enum zio_flag flags);
443
444 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
445 uint64_t size, zio_done_func_t *done, void *private,
446 int priority, enum zio_flag flags, const zbookmark_t *zb);
447
448 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
449 void *data, uint64_t size, const zio_prop_t *zp,
450 zio_done_func_t *ready, zio_done_func_t *done, void *private,
451 int priority, enum zio_flag flags, const zbookmark_t *zb);
452
453 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
454 void *data, uint64_t size, zio_done_func_t *done, void *private,
455 int priority, enum zio_flag flags, zbookmark_t *zb);
456
457 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies);
458
459 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
460
461 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
462 const blkptr_t *bp,
463 zio_done_func_t *done, void *private, enum zio_flag flags);
464
465 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
466 zio_done_func_t *done, void *private, int priority, enum zio_flag flags);
467
468 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
469 uint64_t size, void *data, int checksum,
470 zio_done_func_t *done, void *private, int priority, enum zio_flag flags,
471 boolean_t labels);
472
473 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
474 uint64_t size, void *data, int checksum,
475 zio_done_func_t *done, void *private, int priority, enum zio_flag flags,
476 boolean_t labels);
477
478 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
479 const blkptr_t *bp, enum zio_flag flags);
480
481 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
482 blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
483 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
484 extern void zio_flush(zio_t *zio, vdev_t *vd);
485 extern void zio_shrink(zio_t *zio, uint64_t size);
486
487 extern int zio_wait(zio_t *zio);
488 extern void zio_nowait(zio_t *zio);
489 extern void zio_execute(zio_t *zio);
490 extern void zio_interrupt(zio_t *zio);
491
492 extern zio_t *zio_walk_parents(zio_t *cio);
493 extern zio_t *zio_walk_children(zio_t *pio);
494 extern zio_t *zio_unique_parent(zio_t *cio);
495 extern void zio_add_child(zio_t *pio, zio_t *cio);
496
497 extern void *zio_buf_alloc(size_t size);
498 extern void zio_buf_free(void *buf, size_t size);
499 extern void *zio_data_buf_alloc(size_t size);
500 extern void zio_data_buf_free(void *buf, size_t size);
501
502 extern void zio_resubmit_stage_async(void *);
503
504 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
505 uint64_t offset, void *data, uint64_t size, int type, int priority,
506 enum zio_flag flags, zio_done_func_t *done, void *private);
507
508 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
509 void *data, uint64_t size, int type, int priority,
510 enum zio_flag flags, zio_done_func_t *done, void *private);
511
512 extern void zio_vdev_io_bypass(zio_t *zio);
513 extern void zio_vdev_io_reissue(zio_t *zio);
514 extern void zio_vdev_io_redone(zio_t *zio);
515
516 extern void zio_checksum_verified(zio_t *zio);
517 extern int zio_worst_error(int e1, int e2);
518
519 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
520 enum zio_checksum parent);
521 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
522 enum zio_checksum child, enum zio_checksum parent);
523 extern enum zio_compress zio_compress_select(enum zio_compress child,
524 enum zio_compress parent);
525
526 extern void zio_suspend(spa_t *spa, zio_t *zio);
527 extern int zio_resume(spa_t *spa);
528 extern void zio_resume_wait(spa_t *spa);
529
530 /*
531 * Initial setup and teardown.
532 */
533 extern void zio_init(void);
534 extern void zio_fini(void);
535
536 /*
537 * Fault injection
538 */
539 struct zinject_record;
540 extern uint32_t zio_injection_enabled;
541 extern int zio_inject_fault(char *name, int flags, int *id,
542 struct zinject_record *record);
543 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
544 struct zinject_record *record);
545 extern int zio_clear_fault(int id);
546 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
547 extern int zio_handle_fault_injection(zio_t *zio, int error);
548 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
549 extern int zio_handle_label_injection(zio_t *zio, int error);
550 extern void zio_handle_ignored_writes(zio_t *zio);
551
552 /*
553 * Checksum ereport functions
554 */
555 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
556 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
557 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
558 const void *good_data, const void *bad_data, boolean_t drop_if_identical);
559
560 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
561 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
562
563 /* If we have the good data in hand, this function can be used */
564 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
565 struct zio *zio, uint64_t offset, uint64_t length,
566 const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
567
568 /* Called from spa_sync(), but primarily an injection handler */
569 extern void spa_handle_ignored_writes(spa_t *spa);
570
571 /* zbookmark functions */
572 boolean_t zbookmark_is_before(const struct dnode_phys *dnp,
573 const zbookmark_t *zb1, const zbookmark_t *zb2);
574
575 #ifdef __cplusplus
576 }
577 #endif
578
579 #endif /* _ZIO_H */