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.
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.
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]
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 Delphix. All rights reserved.
27 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
28 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
34 #include <sys/zfs_context.h>
38 #include <sys/kstat.h>
39 #include <sys/fs/zfs.h>
40 #include <sys/zio_impl.h>
49 #define ZEC_MAGIC 0x210da7ab10c7a11ULL
51 typedef struct zio_eck {
52 uint64_t zec_magic; /* for validation, endianness */
53 zio_cksum_t zec_cksum; /* 256-bit checksum */
57 * Gang block headers are self-checksumming and contain an array
60 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE
61 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \
62 sizeof (zio_eck_t)) / sizeof (blkptr_t))
63 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \
64 sizeof (zio_eck_t) - \
65 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
68 typedef struct zio_gbh {
69 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS];
70 uint64_t zg_filler[SPA_GBH_FILLER];
75 ZIO_CHECKSUM_INHERIT = 0,
79 ZIO_CHECKSUM_GANG_HEADER,
81 ZIO_CHECKSUM_FLETCHER_2,
82 ZIO_CHECKSUM_FLETCHER_4,
85 ZIO_CHECKSUM_NOPARITY,
86 ZIO_CHECKSUM_FUNCTIONS
89 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4
90 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON
92 #define ZIO_CHECKSUM_MASK 0xffULL
93 #define ZIO_CHECKSUM_VERIFY (1 << 8)
95 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256
96 #define ZIO_DEDUPDITTO_MIN 100
99 ZIO_COMPRESS_INHERIT = 0,
115 ZIO_COMPRESS_FUNCTIONS
118 /* N.B. when altering this value, also change BOOTFS_COMPRESS_VALID below */
119 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB
120 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF
122 #define BOOTFS_COMPRESS_VALID(compress) \
123 ((compress) == ZIO_COMPRESS_LZJB || \
124 (compress) == ZIO_COMPRESS_LZ4 || \
125 ((compress) == ZIO_COMPRESS_ON && \
126 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \
127 (compress) == ZIO_COMPRESS_OFF)
129 #define ZIO_FAILURE_MODE_WAIT 0
130 #define ZIO_FAILURE_MODE_CONTINUE 1
131 #define ZIO_FAILURE_MODE_PANIC 2
133 typedef enum zio_priority {
134 ZIO_PRIORITY_SYNC_READ,
135 ZIO_PRIORITY_SYNC_WRITE, /* ZIL */
136 ZIO_PRIORITY_ASYNC_READ, /* prefetch */
137 ZIO_PRIORITY_ASYNC_WRITE, /* spa_sync() */
138 ZIO_PRIORITY_SCRUB, /* asynchronous scrub/resilver reads */
139 ZIO_PRIORITY_NUM_QUEUEABLE,
141 ZIO_PRIORITY_NOW /* non-queued i/os (e.g. free) */
144 #define ZIO_PIPELINE_CONTINUE 0x100
145 #define ZIO_PIPELINE_STOP 0x101
149 * Flags inherited by gang, ddt, and vdev children,
150 * and that must be equal for two zios to aggregate
152 ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
153 ZIO_FLAG_IO_REPAIR = 1 << 1,
154 ZIO_FLAG_SELF_HEAL = 1 << 2,
155 ZIO_FLAG_RESILVER = 1 << 3,
156 ZIO_FLAG_SCRUB = 1 << 4,
157 ZIO_FLAG_SCAN_THREAD = 1 << 5,
159 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
162 * Flags inherited by ddt, gang, and vdev children.
164 ZIO_FLAG_CANFAIL = 1 << 6, /* must be first for INHERIT */
165 ZIO_FLAG_SPECULATIVE = 1 << 7,
166 ZIO_FLAG_CONFIG_WRITER = 1 << 8,
167 ZIO_FLAG_DONT_RETRY = 1 << 9,
168 ZIO_FLAG_DONT_CACHE = 1 << 10,
169 ZIO_FLAG_NODATA = 1 << 11,
170 ZIO_FLAG_INDUCE_DAMAGE = 1 << 12,
172 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
173 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)
176 * Flags inherited by vdev children.
178 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */
179 ZIO_FLAG_PROBE = 1 << 14,
180 ZIO_FLAG_TRYHARD = 1 << 15,
181 ZIO_FLAG_OPTIONAL = 1 << 16,
183 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
186 * Flags not inherited by any children.
188 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */
189 ZIO_FLAG_DONT_PROPAGATE = 1 << 18,
190 ZIO_FLAG_IO_BYPASS = 1 << 19,
191 ZIO_FLAG_IO_REWRITE = 1 << 20,
192 ZIO_FLAG_RAW = 1 << 21,
193 ZIO_FLAG_GANG_CHILD = 1 << 22,
194 ZIO_FLAG_DDT_CHILD = 1 << 23,
195 ZIO_FLAG_GODFATHER = 1 << 24,
196 ZIO_FLAG_NOPWRITE = 1 << 25,
197 ZIO_FLAG_REEXECUTED = 1 << 26,
198 ZIO_FLAG_DELEGATED = 1 << 27,
201 #define ZIO_FLAG_MUSTSUCCEED 0
203 #define ZIO_DDT_CHILD_FLAGS(zio) \
204 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \
205 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
207 #define ZIO_GANG_CHILD_FLAGS(zio) \
208 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \
209 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
211 #define ZIO_VDEV_CHILD_FLAGS(zio) \
212 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \
230 * We'll take the number 122 and 123 to indicate checksum errors and
231 * fragmentation. Those doesn't collide with any errno values as they
232 * are greater than ELAST.
237 typedef void zio_done_func_t(zio_t *zio);
239 extern const char *zio_type_name[ZIO_TYPES];
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:
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>.
251 * Note: this structure is called a bookmark because its original purpose
252 * was to remember where to resume a pool-wide traverse.
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.
258 typedef struct zbookmark {
265 #define SET_BOOKMARK(zb, objset, object, level, blkid) \
267 (zb)->zb_objset = objset; \
268 (zb)->zb_object = object; \
269 (zb)->zb_level = level; \
270 (zb)->zb_blkid = blkid; \
273 #define ZB_DESTROYED_OBJSET (-1ULL)
275 #define ZB_ROOT_OBJECT (0ULL)
276 #define ZB_ROOT_LEVEL (-1LL)
277 #define ZB_ROOT_BLKID (0ULL)
279 #define ZB_ZIL_OBJECT (0ULL)
280 #define ZB_ZIL_LEVEL (-2LL)
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)
290 typedef struct zio_prop {
291 enum zio_checksum zp_checksum;
292 enum zio_compress zp_compress;
293 dmu_object_type_t zp_type;
297 boolean_t zp_dedup_verify;
298 boolean_t zp_nopwrite;
301 typedef struct zio_cksum_report zio_cksum_report_t;
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);
307 struct zio_bad_cksum; /* defined in zio_checksum.h */
310 struct zio_cksum_report {
311 struct zio_cksum_report *zcr_next;
312 nvlist_t *zcr_ereport;
313 nvlist_t *zcr_detector;
315 size_t zcr_cbinfo; /* passed to zcr_free() */
318 zio_cksum_finish_f *zcr_finish;
319 zio_cksum_free_f *zcr_free;
321 /* internal use only */
322 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */
325 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
328 zio_vsd_cksum_report_f zio_vsd_default_cksum_report;
330 typedef struct zio_vsd_ops {
331 zio_done_func_t *vsd_free;
332 zio_vsd_cksum_report_f *vsd_cksum_report;
335 typedef struct zio_gang_node {
336 zio_gbh_phys_t *gn_gbh;
337 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
340 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
341 zio_gang_node_t *gn, void *data);
343 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
345 typedef struct zio_transform {
347 uint64_t zt_orig_size;
349 zio_transform_func_t *zt_transform;
350 struct zio_transform *zt_next;
353 typedef int zio_pipe_stage_t(zio_t *zio);
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.
362 #define ZIO_REEXECUTE_NOW 0x01
363 #define ZIO_REEXECUTE_SUSPEND 0x02
365 typedef struct zio_link {
368 list_node_t zl_parent_node;
369 list_node_t zl_child_node;
373 * Used for TRIM kstat.
375 typedef struct zio_trim_stats {
377 * Number of bytes successfully TRIMmed.
382 * Number of successful TRIM requests.
384 kstat_named_t success;
387 * Number of TRIM requests that failed because TRIM is not
390 kstat_named_t unsupported;
393 * Number of TRIM requests that failed for other reasons.
395 kstat_named_t failed;
398 extern zio_trim_stats_t zio_trim_stats;
400 #define ZIO_TRIM_STAT_INCR(stat, val) \
401 atomic_add_64(&zio_trim_stats.stat.value.ui64, (val));
402 #define ZIO_TRIM_STAT_BUMP(stat) \
403 ZIO_TRIM_STAT_INCR(stat, 1);
406 /* Core information about this I/O */
407 zbookmark_t io_bookmark;
410 enum zio_child io_child_type;
412 zio_priority_t io_priority;
413 uint8_t io_reexecute;
414 uint8_t io_state[ZIO_WAIT_TYPES];
418 blkptr_t *io_bp_override;
420 list_t io_parent_list;
421 list_t io_child_list;
422 zio_link_t *io_walk_link;
424 zio_transform_t *io_transform_stack;
427 zio_done_func_t *io_ready;
428 zio_done_func_t *io_physdone;
429 zio_done_func_t *io_done;
431 int64_t io_prev_space_delta; /* DMU private */
434 /* Data represented by this I/O */
438 uint64_t io_orig_size;
440 /* Stuff for the vdev stack */
443 const zio_vsd_ops_t *io_vsd_ops;
446 hrtime_t io_timestamp;
447 avl_node_t io_queue_node;
449 /* Internal pipeline state */
450 enum zio_flag io_flags;
451 enum zio_stage io_stage;
452 enum zio_stage io_pipeline;
453 enum zio_flag io_orig_flags;
454 enum zio_stage io_orig_stage;
455 enum zio_stage io_orig_pipeline;
457 int io_child_error[ZIO_CHILD_TYPES];
458 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
459 uint64_t io_child_count;
460 uint64_t io_phys_children;
461 uint64_t io_parent_count;
463 zio_t *io_gang_leader;
464 zio_gang_node_t *io_gang_tree;
471 zio_cksum_report_t *io_cksum_report;
474 /* Taskq dispatching state */
475 taskq_ent_t io_tqent;
477 avl_node_t io_trim_node;
478 list_node_t io_trim_link;
481 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
482 zio_done_func_t *done, void *priv, enum zio_flag flags);
484 extern zio_t *zio_root(spa_t *spa,
485 zio_done_func_t *done, void *priv, enum zio_flag flags);
487 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
488 uint64_t size, zio_done_func_t *done, void *priv,
489 zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb);
491 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
492 void *data, uint64_t size, const zio_prop_t *zp,
493 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done,
495 zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb);
497 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
498 void *data, uint64_t size, zio_done_func_t *done, void *priv,
499 zio_priority_t priority, enum zio_flag flags, zbookmark_t *zb);
501 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
504 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
506 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
508 zio_done_func_t *done, void *priv, enum zio_flag flags);
510 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
511 uint64_t offset, uint64_t size, zio_done_func_t *done, void *priv,
512 enum zio_flag flags);
514 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
515 uint64_t size, void *data, int checksum,
516 zio_done_func_t *done, void *priv, zio_priority_t priority,
517 enum zio_flag flags, boolean_t labels);
519 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
520 uint64_t size, void *data, int checksum,
521 zio_done_func_t *done, void *priv, zio_priority_t priority,
522 enum zio_flag flags, boolean_t labels);
524 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
525 const blkptr_t *bp, uint64_t size, enum zio_flag flags);
527 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
528 blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
529 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
530 extern void zio_flush(zio_t *zio, vdev_t *vd);
531 extern zio_t *zio_trim(zio_t *zio, spa_t *spa, vdev_t *vd, uint64_t offset,
533 extern void zio_shrink(zio_t *zio, uint64_t size);
535 extern int zio_wait(zio_t *zio);
536 extern void zio_nowait(zio_t *zio);
537 extern void zio_execute(zio_t *zio);
538 extern void zio_interrupt(zio_t *zio);
540 extern zio_t *zio_walk_parents(zio_t *cio);
541 extern zio_t *zio_walk_children(zio_t *pio);
542 extern zio_t *zio_unique_parent(zio_t *cio);
543 extern void zio_add_child(zio_t *pio, zio_t *cio);
545 extern void *zio_buf_alloc(size_t size);
546 extern void zio_buf_free(void *buf, size_t size);
547 extern void *zio_data_buf_alloc(size_t size);
548 extern void zio_data_buf_free(void *buf, size_t size);
550 extern void zio_resubmit_stage_async(void *);
552 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
553 uint64_t offset, void *data, uint64_t size, int type,
554 zio_priority_t priority, enum zio_flag flags,
555 zio_done_func_t *done, void *priv);
557 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
558 void *data, uint64_t size, int type, zio_priority_t priority,
559 enum zio_flag flags, zio_done_func_t *done, void *priv);
561 extern void zio_vdev_io_bypass(zio_t *zio);
562 extern void zio_vdev_io_reissue(zio_t *zio);
563 extern void zio_vdev_io_redone(zio_t *zio);
565 extern void zio_checksum_verified(zio_t *zio);
566 extern int zio_worst_error(int e1, int e2);
568 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
569 enum zio_checksum parent);
570 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
571 enum zio_checksum child, enum zio_checksum parent);
572 extern enum zio_compress zio_compress_select(enum zio_compress child,
573 enum zio_compress parent);
575 extern void zio_suspend(spa_t *spa, zio_t *zio);
576 extern int zio_resume(spa_t *spa);
577 extern void zio_resume_wait(spa_t *spa);
580 * Initial setup and teardown.
582 extern void zio_init(void);
583 extern void zio_fini(void);
588 struct zinject_record;
589 extern uint32_t zio_injection_enabled;
590 extern int zio_inject_fault(char *name, int flags, int *id,
591 struct zinject_record *record);
592 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
593 struct zinject_record *record);
594 extern int zio_clear_fault(int id);
595 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
596 extern int zio_handle_fault_injection(zio_t *zio, int error);
597 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
598 extern int zio_handle_label_injection(zio_t *zio, int error);
599 extern void zio_handle_ignored_writes(zio_t *zio);
600 extern uint64_t zio_handle_io_delay(zio_t *zio);
603 * Checksum ereport functions
605 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
606 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
607 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
608 const void *good_data, const void *bad_data, boolean_t drop_if_identical);
610 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
611 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
613 /* If we have the good data in hand, this function can be used */
614 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
615 struct zio *zio, uint64_t offset, uint64_t length,
616 const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
618 /* Called from spa_sync(), but primarily an injection handler */
619 extern void spa_handle_ignored_writes(spa_t *spa);
621 /* zbookmark functions */
622 boolean_t zbookmark_is_before(const struct dnode_phys *dnp,
623 const zbookmark_t *zb1, const zbookmark_t *zb2);