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 */
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 */
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;
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 hrtime_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
|
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) 2013 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 */
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 typedef enum zio_priority {
130 ZIO_PRIORITY_SYNC_READ,
131 ZIO_PRIORITY_SYNC_WRITE, /* ZIL */
132 ZIO_PRIORITY_ASYNC_READ, /* prefetch */
133 ZIO_PRIORITY_ASYNC_WRITE, /* spa_sync() */
134 ZIO_PRIORITY_SCRUB, /* asynchronous scrub/resilver reads */
135 ZIO_PRIORITY_NUM_QUEUEABLE,
136
137 ZIO_PRIORITY_NOW /* non-queued i/os (e.g. free) */
138 } zio_priority_t;
139
140 #define ZIO_PIPELINE_CONTINUE 0x100
141 #define ZIO_PIPELINE_STOP 0x101
142
143 enum zio_flag {
144 /*
145 * Flags inherited by gang, ddt, and vdev children,
146 * and that must be equal for two zios to aggregate
147 */
148 ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
149 ZIO_FLAG_IO_REPAIR = 1 << 1,
150 ZIO_FLAG_SELF_HEAL = 1 << 2,
151 ZIO_FLAG_RESILVER = 1 << 3,
152 ZIO_FLAG_SCRUB = 1 << 4,
153 ZIO_FLAG_SCAN_THREAD = 1 << 5,
154
155 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
156
157 /*
158 * Flags inherited by ddt, gang, and vdev children.
159 */
174 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */
175 ZIO_FLAG_PROBE = 1 << 14,
176 ZIO_FLAG_TRYHARD = 1 << 15,
177 ZIO_FLAG_OPTIONAL = 1 << 16,
178
179 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
180
181 /*
182 * Flags not inherited by any children.
183 */
184 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */
185 ZIO_FLAG_DONT_PROPAGATE = 1 << 18,
186 ZIO_FLAG_IO_BYPASS = 1 << 19,
187 ZIO_FLAG_IO_REWRITE = 1 << 20,
188 ZIO_FLAG_RAW = 1 << 21,
189 ZIO_FLAG_GANG_CHILD = 1 << 22,
190 ZIO_FLAG_DDT_CHILD = 1 << 23,
191 ZIO_FLAG_GODFATHER = 1 << 24,
192 ZIO_FLAG_NOPWRITE = 1 << 25,
193 ZIO_FLAG_REEXECUTED = 1 << 26,
194 ZIO_FLAG_DELEGATED = 1 << 27,
195 };
196
197 #define ZIO_FLAG_MUSTSUCCEED 0
198
199 #define ZIO_DDT_CHILD_FLAGS(zio) \
200 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \
201 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
202
203 #define ZIO_GANG_CHILD_FLAGS(zio) \
204 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \
205 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
206
207 #define ZIO_VDEV_CHILD_FLAGS(zio) \
208 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \
209 ZIO_FLAG_CANFAIL)
210
211 enum zio_child {
212 ZIO_CHILD_VDEV = 0,
213 ZIO_CHILD_GANG,
214 ZIO_CHILD_DDT,
215 ZIO_CHILD_LOGICAL,
216 ZIO_CHILD_TYPES
217 };
218
219 enum zio_wait_type {
220 ZIO_WAIT_READY = 0,
221 ZIO_WAIT_DONE,
222 ZIO_WAIT_TYPES
223 };
224
225 /*
226 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
227 * graveyard) to indicate checksum errors and fragmentation.
228 */
229 #define ECKSUM EBADE
230 #define EFRAGS EBADR
231
232 typedef void zio_done_func_t(zio_t *zio);
233
234 extern const char *zio_type_name[ZIO_TYPES];
235
236 /*
237 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
238 * identifies any block in the pool. By convention, the meta-objset (MOS)
239 * is objset 0, and the meta-dnode is object 0. This covers all blocks
240 * except root blocks and ZIL blocks, which are defined as follows:
241 *
242 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
243 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
244 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
245 *
246 * Note: this structure is called a bookmark because its original purpose
247 * was to remember where to resume a pool-wide traverse.
248 *
249 * Note: this structure is passed between userland and the kernel.
250 * Therefore it must not change size or alignment between 32/64 bit
251 * compilation options.
252 */
253 typedef struct zbookmark {
254 uint64_t zb_objset;
354 * the reexecute flags are protected by io_lock, modifiable by children,
355 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
356 */
357 #define ZIO_REEXECUTE_NOW 0x01
358 #define ZIO_REEXECUTE_SUSPEND 0x02
359
360 typedef struct zio_link {
361 zio_t *zl_parent;
362 zio_t *zl_child;
363 list_node_t zl_parent_node;
364 list_node_t zl_child_node;
365 } zio_link_t;
366
367 struct zio {
368 /* Core information about this I/O */
369 zbookmark_t io_bookmark;
370 zio_prop_t io_prop;
371 zio_type_t io_type;
372 enum zio_child io_child_type;
373 int io_cmd;
374 zio_priority_t io_priority;
375 uint8_t io_reexecute;
376 uint8_t io_state[ZIO_WAIT_TYPES];
377 uint64_t io_txg;
378 spa_t *io_spa;
379 blkptr_t *io_bp;
380 blkptr_t *io_bp_override;
381 blkptr_t io_bp_copy;
382 list_t io_parent_list;
383 list_t io_child_list;
384 zio_link_t *io_walk_link;
385 zio_t *io_logical;
386 zio_transform_t *io_transform_stack;
387
388 /* Callback info */
389 zio_done_func_t *io_ready;
390 zio_done_func_t *io_physdone;
391 zio_done_func_t *io_done;
392 void *io_private;
393 int64_t io_prev_space_delta; /* DMU private */
394 blkptr_t io_bp_orig;
395
396 /* Data represented by this I/O */
397 void *io_data;
398 void *io_orig_data;
399 uint64_t io_size;
400 uint64_t io_orig_size;
401
402 /* Stuff for the vdev stack */
403 vdev_t *io_vd;
404 void *io_vsd;
405 const zio_vsd_ops_t *io_vsd_ops;
406
407 uint64_t io_offset;
408 hrtime_t io_timestamp;
409 avl_node_t io_queue_node;
410
411 /* Internal pipeline state */
412 enum zio_flag io_flags;
413 enum zio_stage io_stage;
414 enum zio_stage io_pipeline;
415 enum zio_flag io_orig_flags;
416 enum zio_stage io_orig_stage;
417 enum zio_stage io_orig_pipeline;
418 int io_error;
419 int io_child_error[ZIO_CHILD_TYPES];
420 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
421 uint64_t io_child_count;
422 uint64_t io_phys_children;
423 uint64_t io_parent_count;
424 uint64_t *io_stall;
425 zio_t *io_gang_leader;
426 zio_gang_node_t *io_gang_tree;
427 void *io_executor;
428 void *io_waiter;
429 kmutex_t io_lock;
430 kcondvar_t io_cv;
431
432 /* FMA state */
433 zio_cksum_report_t *io_cksum_report;
434 uint64_t io_ena;
435
436 /* Taskq dispatching state */
437 taskq_ent_t io_tqent;
438 };
439
440 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
441 zio_done_func_t *done, void *private, enum zio_flag flags);
442
443 extern zio_t *zio_root(spa_t *spa,
444 zio_done_func_t *done, void *private, enum zio_flag flags);
445
446 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
447 uint64_t size, zio_done_func_t *done, void *private,
448 zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb);
449
450 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
451 void *data, uint64_t size, const zio_prop_t *zp,
452 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done,
453 void *private,
454 zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb);
455
456 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
457 void *data, uint64_t size, zio_done_func_t *done, void *private,
458 zio_priority_t priority, enum zio_flag flags, zbookmark_t *zb);
459
460 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
461 boolean_t nopwrite);
462
463 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
464
465 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
466 const blkptr_t *bp,
467 zio_done_func_t *done, void *private, enum zio_flag flags);
468
469 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
470 zio_done_func_t *done, void *private, enum zio_flag flags);
471
472 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
473 uint64_t size, void *data, int checksum,
474 zio_done_func_t *done, void *private, zio_priority_t priority,
475 enum zio_flag flags, boolean_t labels);
476
477 extern zio_t *zio_write_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, zio_priority_t priority,
480 enum zio_flag flags, boolean_t labels);
481
482 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
483 const blkptr_t *bp, enum zio_flag flags);
484
485 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
486 blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
487 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
488 extern void zio_flush(zio_t *zio, vdev_t *vd);
489 extern void zio_shrink(zio_t *zio, uint64_t size);
490
491 extern int zio_wait(zio_t *zio);
492 extern void zio_nowait(zio_t *zio);
493 extern void zio_execute(zio_t *zio);
494 extern void zio_interrupt(zio_t *zio);
495
496 extern zio_t *zio_walk_parents(zio_t *cio);
497 extern zio_t *zio_walk_children(zio_t *pio);
498 extern zio_t *zio_unique_parent(zio_t *cio);
499 extern void zio_add_child(zio_t *pio, zio_t *cio);
500
501 extern void *zio_buf_alloc(size_t size);
502 extern void zio_buf_free(void *buf, size_t size);
503 extern void *zio_data_buf_alloc(size_t size);
504 extern void zio_data_buf_free(void *buf, size_t size);
505
506 extern void zio_resubmit_stage_async(void *);
507
508 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
509 uint64_t offset, void *data, uint64_t size, int type,
510 zio_priority_t priority, enum zio_flag flags,
511 zio_done_func_t *done, void *private);
512
513 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
514 void *data, uint64_t size, int type, zio_priority_t priority,
515 enum zio_flag flags, zio_done_func_t *done, void *private);
516
517 extern void zio_vdev_io_bypass(zio_t *zio);
518 extern void zio_vdev_io_reissue(zio_t *zio);
519 extern void zio_vdev_io_redone(zio_t *zio);
520
521 extern void zio_checksum_verified(zio_t *zio);
522 extern int zio_worst_error(int e1, int e2);
523
524 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
525 enum zio_checksum parent);
526 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
527 enum zio_checksum child, enum zio_checksum parent);
528 extern enum zio_compress zio_compress_select(enum zio_compress child,
529 enum zio_compress parent);
530
531 extern void zio_suspend(spa_t *spa, zio_t *zio);
532 extern int zio_resume(spa_t *spa);
533 extern void zio_resume_wait(spa_t *spa);
534
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