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--- old/usr/src/uts/common/fs/zfs/sys/zio.h
+++ new/usr/src/uts/common/fs/zfs/sys/zio.h
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 24 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25 25 * Copyright (c) 2013 by Delphix. All rights reserved.
26 26 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
27 27 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
28 28 */
29 29
30 30 #ifndef _ZIO_H
31 31 #define _ZIO_H
32 32
33 33 #include <sys/zfs_context.h>
34 34 #include <sys/spa.h>
35 35 #include <sys/txg.h>
36 36 #include <sys/avl.h>
37 37 #include <sys/fs/zfs.h>
38 38 #include <sys/zio_impl.h>
39 39
40 40 #ifdef __cplusplus
41 41 extern "C" {
42 42 #endif
43 43
44 44 /*
45 45 * Embedded checksum
46 46 */
47 47 #define ZEC_MAGIC 0x210da7ab10c7a11ULL
48 48
49 49 typedef struct zio_eck {
50 50 uint64_t zec_magic; /* for validation, endianness */
51 51 zio_cksum_t zec_cksum; /* 256-bit checksum */
52 52 } zio_eck_t;
53 53
54 54 /*
55 55 * Gang block headers are self-checksumming and contain an array
56 56 * of block pointers.
57 57 */
58 58 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE
59 59 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \
60 60 sizeof (zio_eck_t)) / sizeof (blkptr_t))
61 61 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \
62 62 sizeof (zio_eck_t) - \
63 63 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
64 64 sizeof (uint64_t))
65 65
66 66 typedef struct zio_gbh {
67 67 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS];
68 68 uint64_t zg_filler[SPA_GBH_FILLER];
69 69 zio_eck_t zg_tail;
70 70 } zio_gbh_phys_t;
71 71
72 72 enum zio_checksum {
73 73 ZIO_CHECKSUM_INHERIT = 0,
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74 74 ZIO_CHECKSUM_ON,
75 75 ZIO_CHECKSUM_OFF,
76 76 ZIO_CHECKSUM_LABEL,
77 77 ZIO_CHECKSUM_GANG_HEADER,
78 78 ZIO_CHECKSUM_ZILOG,
79 79 ZIO_CHECKSUM_FLETCHER_2,
80 80 ZIO_CHECKSUM_FLETCHER_4,
81 81 ZIO_CHECKSUM_SHA256,
82 82 ZIO_CHECKSUM_ZILOG2,
83 83 ZIO_CHECKSUM_NOPARITY,
84 + ZIO_CHECKSUM_SHA512,
85 + ZIO_CHECKSUM_SKEIN,
86 + ZIO_CHECKSUM_EDONR,
84 87 ZIO_CHECKSUM_FUNCTIONS
85 88 };
86 89
87 90 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4
88 91 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON
89 92
90 93 #define ZIO_CHECKSUM_MASK 0xffULL
91 94 #define ZIO_CHECKSUM_VERIFY (1 << 8)
92 95
93 96 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256
94 97 #define ZIO_DEDUPDITTO_MIN 100
95 98
96 99 enum zio_compress {
97 100 ZIO_COMPRESS_INHERIT = 0,
98 101 ZIO_COMPRESS_ON,
99 102 ZIO_COMPRESS_OFF,
100 103 ZIO_COMPRESS_LZJB,
101 104 ZIO_COMPRESS_EMPTY,
102 105 ZIO_COMPRESS_GZIP_1,
103 106 ZIO_COMPRESS_GZIP_2,
104 107 ZIO_COMPRESS_GZIP_3,
105 108 ZIO_COMPRESS_GZIP_4,
106 109 ZIO_COMPRESS_GZIP_5,
107 110 ZIO_COMPRESS_GZIP_6,
108 111 ZIO_COMPRESS_GZIP_7,
109 112 ZIO_COMPRESS_GZIP_8,
110 113 ZIO_COMPRESS_GZIP_9,
111 114 ZIO_COMPRESS_ZLE,
112 115 ZIO_COMPRESS_LZ4,
113 116 ZIO_COMPRESS_FUNCTIONS
114 117 };
115 118
116 119 /* N.B. when altering this value, also change BOOTFS_COMPRESS_VALID below */
117 120 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB
118 121 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF
119 122
120 123 #define BOOTFS_COMPRESS_VALID(compress) \
121 124 ((compress) == ZIO_COMPRESS_LZJB || \
122 125 (compress) == ZIO_COMPRESS_LZ4 || \
123 126 ((compress) == ZIO_COMPRESS_ON && \
124 127 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \
125 128 (compress) == ZIO_COMPRESS_OFF)
126 129
127 130 #define ZIO_FAILURE_MODE_WAIT 0
128 131 #define ZIO_FAILURE_MODE_CONTINUE 1
129 132 #define ZIO_FAILURE_MODE_PANIC 2
130 133
131 134 typedef enum zio_priority {
132 135 ZIO_PRIORITY_SYNC_READ,
133 136 ZIO_PRIORITY_SYNC_WRITE, /* ZIL */
134 137 ZIO_PRIORITY_ASYNC_READ, /* prefetch */
135 138 ZIO_PRIORITY_ASYNC_WRITE, /* spa_sync() */
136 139 ZIO_PRIORITY_SCRUB, /* asynchronous scrub/resilver reads */
137 140 ZIO_PRIORITY_NUM_QUEUEABLE,
138 141
139 142 ZIO_PRIORITY_NOW /* non-queued i/os (e.g. free) */
140 143 } zio_priority_t;
141 144
142 145 #define ZIO_PIPELINE_CONTINUE 0x100
143 146 #define ZIO_PIPELINE_STOP 0x101
144 147
145 148 enum zio_flag {
146 149 /*
147 150 * Flags inherited by gang, ddt, and vdev children,
148 151 * and that must be equal for two zios to aggregate
149 152 */
150 153 ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
151 154 ZIO_FLAG_IO_REPAIR = 1 << 1,
152 155 ZIO_FLAG_SELF_HEAL = 1 << 2,
153 156 ZIO_FLAG_RESILVER = 1 << 3,
154 157 ZIO_FLAG_SCRUB = 1 << 4,
155 158 ZIO_FLAG_SCAN_THREAD = 1 << 5,
156 159
157 160 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
158 161
159 162 /*
160 163 * Flags inherited by ddt, gang, and vdev children.
161 164 */
162 165 ZIO_FLAG_CANFAIL = 1 << 6, /* must be first for INHERIT */
163 166 ZIO_FLAG_SPECULATIVE = 1 << 7,
164 167 ZIO_FLAG_CONFIG_WRITER = 1 << 8,
165 168 ZIO_FLAG_DONT_RETRY = 1 << 9,
166 169 ZIO_FLAG_DONT_CACHE = 1 << 10,
167 170 ZIO_FLAG_NODATA = 1 << 11,
168 171 ZIO_FLAG_INDUCE_DAMAGE = 1 << 12,
169 172
170 173 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
171 174 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)
172 175
173 176 /*
174 177 * Flags inherited by vdev children.
175 178 */
176 179 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */
177 180 ZIO_FLAG_PROBE = 1 << 14,
178 181 ZIO_FLAG_TRYHARD = 1 << 15,
179 182 ZIO_FLAG_OPTIONAL = 1 << 16,
180 183
181 184 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
182 185
183 186 /*
184 187 * Flags not inherited by any children.
185 188 */
186 189 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */
187 190 ZIO_FLAG_DONT_PROPAGATE = 1 << 18,
188 191 ZIO_FLAG_IO_BYPASS = 1 << 19,
189 192 ZIO_FLAG_IO_REWRITE = 1 << 20,
190 193 ZIO_FLAG_RAW = 1 << 21,
191 194 ZIO_FLAG_GANG_CHILD = 1 << 22,
192 195 ZIO_FLAG_DDT_CHILD = 1 << 23,
193 196 ZIO_FLAG_GODFATHER = 1 << 24,
194 197 ZIO_FLAG_NOPWRITE = 1 << 25,
195 198 ZIO_FLAG_REEXECUTED = 1 << 26,
196 199 ZIO_FLAG_DELEGATED = 1 << 27,
197 200 };
198 201
199 202 #define ZIO_FLAG_MUSTSUCCEED 0
200 203
201 204 #define ZIO_DDT_CHILD_FLAGS(zio) \
202 205 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \
203 206 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
204 207
205 208 #define ZIO_GANG_CHILD_FLAGS(zio) \
206 209 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \
207 210 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
208 211
209 212 #define ZIO_VDEV_CHILD_FLAGS(zio) \
210 213 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \
211 214 ZIO_FLAG_CANFAIL)
212 215
213 216 enum zio_child {
214 217 ZIO_CHILD_VDEV = 0,
215 218 ZIO_CHILD_GANG,
216 219 ZIO_CHILD_DDT,
217 220 ZIO_CHILD_LOGICAL,
218 221 ZIO_CHILD_TYPES
219 222 };
220 223
221 224 enum zio_wait_type {
222 225 ZIO_WAIT_READY = 0,
223 226 ZIO_WAIT_DONE,
224 227 ZIO_WAIT_TYPES
225 228 };
226 229
227 230 /*
228 231 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
229 232 * graveyard) to indicate checksum errors and fragmentation.
230 233 */
231 234 #define ECKSUM EBADE
232 235 #define EFRAGS EBADR
233 236
234 237 typedef void zio_done_func_t(zio_t *zio);
235 238
236 239 extern const char *zio_type_name[ZIO_TYPES];
237 240
238 241 /*
239 242 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
240 243 * identifies any block in the pool. By convention, the meta-objset (MOS)
241 244 * is objset 0, and the meta-dnode is object 0. This covers all blocks
242 245 * except root blocks and ZIL blocks, which are defined as follows:
243 246 *
244 247 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
245 248 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
246 249 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
247 250 *
248 251 * Note: this structure is called a bookmark because its original purpose
249 252 * was to remember where to resume a pool-wide traverse.
250 253 *
251 254 * Note: this structure is passed between userland and the kernel.
252 255 * Therefore it must not change size or alignment between 32/64 bit
253 256 * compilation options.
254 257 */
255 258 typedef struct zbookmark {
256 259 uint64_t zb_objset;
257 260 uint64_t zb_object;
258 261 int64_t zb_level;
259 262 uint64_t zb_blkid;
260 263 } zbookmark_t;
261 264
262 265 #define SET_BOOKMARK(zb, objset, object, level, blkid) \
263 266 { \
264 267 (zb)->zb_objset = objset; \
265 268 (zb)->zb_object = object; \
266 269 (zb)->zb_level = level; \
267 270 (zb)->zb_blkid = blkid; \
268 271 }
269 272
270 273 #define ZB_DESTROYED_OBJSET (-1ULL)
271 274
272 275 #define ZB_ROOT_OBJECT (0ULL)
273 276 #define ZB_ROOT_LEVEL (-1LL)
274 277 #define ZB_ROOT_BLKID (0ULL)
275 278
276 279 #define ZB_ZIL_OBJECT (0ULL)
277 280 #define ZB_ZIL_LEVEL (-2LL)
278 281
279 282 #define ZB_IS_ZERO(zb) \
280 283 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \
281 284 (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
282 285 #define ZB_IS_ROOT(zb) \
283 286 ((zb)->zb_object == ZB_ROOT_OBJECT && \
284 287 (zb)->zb_level == ZB_ROOT_LEVEL && \
285 288 (zb)->zb_blkid == ZB_ROOT_BLKID)
286 289
287 290 typedef struct zio_prop {
288 291 enum zio_checksum zp_checksum;
289 292 enum zio_compress zp_compress;
290 293 dmu_object_type_t zp_type;
291 294 uint8_t zp_level;
292 295 uint8_t zp_copies;
293 296 boolean_t zp_dedup;
294 297 boolean_t zp_dedup_verify;
295 298 boolean_t zp_nopwrite;
296 299 } zio_prop_t;
297 300
298 301 typedef struct zio_cksum_report zio_cksum_report_t;
299 302
300 303 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
301 304 const void *good_data);
302 305 typedef void zio_cksum_free_f(void *cbdata, size_t size);
303 306
304 307 struct zio_bad_cksum; /* defined in zio_checksum.h */
305 308 struct dnode_phys;
306 309
307 310 struct zio_cksum_report {
308 311 struct zio_cksum_report *zcr_next;
309 312 nvlist_t *zcr_ereport;
310 313 nvlist_t *zcr_detector;
311 314 void *zcr_cbdata;
312 315 size_t zcr_cbinfo; /* passed to zcr_free() */
313 316 uint64_t zcr_align;
314 317 uint64_t zcr_length;
315 318 zio_cksum_finish_f *zcr_finish;
316 319 zio_cksum_free_f *zcr_free;
317 320
318 321 /* internal use only */
319 322 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */
320 323 };
321 324
322 325 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
323 326 void *arg);
324 327
325 328 zio_vsd_cksum_report_f zio_vsd_default_cksum_report;
326 329
327 330 typedef struct zio_vsd_ops {
328 331 zio_done_func_t *vsd_free;
329 332 zio_vsd_cksum_report_f *vsd_cksum_report;
330 333 } zio_vsd_ops_t;
331 334
332 335 typedef struct zio_gang_node {
333 336 zio_gbh_phys_t *gn_gbh;
334 337 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
335 338 } zio_gang_node_t;
336 339
337 340 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
338 341 zio_gang_node_t *gn, void *data);
339 342
340 343 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
341 344
342 345 typedef struct zio_transform {
343 346 void *zt_orig_data;
344 347 uint64_t zt_orig_size;
345 348 uint64_t zt_bufsize;
346 349 zio_transform_func_t *zt_transform;
347 350 struct zio_transform *zt_next;
348 351 } zio_transform_t;
349 352
350 353 typedef int zio_pipe_stage_t(zio_t *zio);
351 354
352 355 /*
353 356 * The io_reexecute flags are distinct from io_flags because the child must
354 357 * be able to propagate them to the parent. The normal io_flags are local
355 358 * to the zio, not protected by any lock, and not modifiable by children;
356 359 * the reexecute flags are protected by io_lock, modifiable by children,
357 360 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
358 361 */
359 362 #define ZIO_REEXECUTE_NOW 0x01
360 363 #define ZIO_REEXECUTE_SUSPEND 0x02
361 364
362 365 typedef struct zio_link {
363 366 zio_t *zl_parent;
364 367 zio_t *zl_child;
365 368 list_node_t zl_parent_node;
366 369 list_node_t zl_child_node;
367 370 } zio_link_t;
368 371
369 372 struct zio {
370 373 /* Core information about this I/O */
371 374 zbookmark_t io_bookmark;
372 375 zio_prop_t io_prop;
373 376 zio_type_t io_type;
374 377 enum zio_child io_child_type;
375 378 int io_cmd;
376 379 zio_priority_t io_priority;
377 380 uint8_t io_reexecute;
378 381 uint8_t io_state[ZIO_WAIT_TYPES];
379 382 uint64_t io_txg;
380 383 spa_t *io_spa;
381 384 blkptr_t *io_bp;
382 385 blkptr_t *io_bp_override;
383 386 blkptr_t io_bp_copy;
384 387 list_t io_parent_list;
385 388 list_t io_child_list;
386 389 zio_link_t *io_walk_link;
387 390 zio_t *io_logical;
388 391 zio_transform_t *io_transform_stack;
389 392
390 393 /* Callback info */
391 394 zio_done_func_t *io_ready;
392 395 zio_done_func_t *io_physdone;
393 396 zio_done_func_t *io_done;
394 397 void *io_private;
395 398 int64_t io_prev_space_delta; /* DMU private */
396 399 blkptr_t io_bp_orig;
397 400
398 401 /* Data represented by this I/O */
399 402 void *io_data;
400 403 void *io_orig_data;
401 404 uint64_t io_size;
402 405 uint64_t io_orig_size;
403 406
404 407 /* Stuff for the vdev stack */
405 408 vdev_t *io_vd;
406 409 void *io_vsd;
407 410 const zio_vsd_ops_t *io_vsd_ops;
408 411
409 412 uint64_t io_offset;
410 413 hrtime_t io_timestamp;
411 414 avl_node_t io_queue_node;
412 415
413 416 /* Internal pipeline state */
414 417 enum zio_flag io_flags;
415 418 enum zio_stage io_stage;
416 419 enum zio_stage io_pipeline;
417 420 enum zio_flag io_orig_flags;
418 421 enum zio_stage io_orig_stage;
419 422 enum zio_stage io_orig_pipeline;
420 423 int io_error;
421 424 int io_child_error[ZIO_CHILD_TYPES];
422 425 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
423 426 uint64_t io_child_count;
424 427 uint64_t io_phys_children;
425 428 uint64_t io_parent_count;
426 429 uint64_t *io_stall;
427 430 zio_t *io_gang_leader;
428 431 zio_gang_node_t *io_gang_tree;
429 432 void *io_executor;
430 433 void *io_waiter;
431 434 kmutex_t io_lock;
432 435 kcondvar_t io_cv;
433 436
434 437 /* FMA state */
435 438 zio_cksum_report_t *io_cksum_report;
436 439 uint64_t io_ena;
437 440
438 441 /* Taskq dispatching state */
439 442 taskq_ent_t io_tqent;
440 443 };
441 444
442 445 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
443 446 zio_done_func_t *done, void *private, enum zio_flag flags);
444 447
445 448 extern zio_t *zio_root(spa_t *spa,
446 449 zio_done_func_t *done, void *private, enum zio_flag flags);
447 450
448 451 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
449 452 uint64_t size, zio_done_func_t *done, void *private,
450 453 zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb);
451 454
452 455 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
453 456 void *data, uint64_t size, const zio_prop_t *zp,
454 457 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done,
455 458 void *private,
456 459 zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb);
457 460
458 461 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
459 462 void *data, uint64_t size, zio_done_func_t *done, void *private,
460 463 zio_priority_t priority, enum zio_flag flags, zbookmark_t *zb);
461 464
462 465 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
463 466 boolean_t nopwrite);
464 467
465 468 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
466 469
467 470 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
468 471 const blkptr_t *bp,
469 472 zio_done_func_t *done, void *private, enum zio_flag flags);
470 473
471 474 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
472 475 zio_done_func_t *done, void *private, enum zio_flag flags);
473 476
474 477 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
475 478 uint64_t size, void *data, int checksum,
476 479 zio_done_func_t *done, void *private, zio_priority_t priority,
477 480 enum zio_flag flags, boolean_t labels);
478 481
479 482 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
480 483 uint64_t size, void *data, int checksum,
481 484 zio_done_func_t *done, void *private, zio_priority_t priority,
482 485 enum zio_flag flags, boolean_t labels);
483 486
484 487 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
485 488 const blkptr_t *bp, enum zio_flag flags);
486 489
487 490 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
488 491 blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
489 492 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
490 493 extern void zio_flush(zio_t *zio, vdev_t *vd);
491 494 extern void zio_shrink(zio_t *zio, uint64_t size);
492 495
493 496 extern int zio_wait(zio_t *zio);
494 497 extern void zio_nowait(zio_t *zio);
495 498 extern void zio_execute(zio_t *zio);
496 499 extern void zio_interrupt(zio_t *zio);
497 500
498 501 extern zio_t *zio_walk_parents(zio_t *cio);
499 502 extern zio_t *zio_walk_children(zio_t *pio);
500 503 extern zio_t *zio_unique_parent(zio_t *cio);
501 504 extern void zio_add_child(zio_t *pio, zio_t *cio);
502 505
503 506 extern void *zio_buf_alloc(size_t size);
504 507 extern void zio_buf_free(void *buf, size_t size);
505 508 extern void *zio_data_buf_alloc(size_t size);
506 509 extern void zio_data_buf_free(void *buf, size_t size);
507 510
508 511 extern void zio_resubmit_stage_async(void *);
509 512
510 513 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
511 514 uint64_t offset, void *data, uint64_t size, int type,
512 515 zio_priority_t priority, enum zio_flag flags,
513 516 zio_done_func_t *done, void *private);
514 517
515 518 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
516 519 void *data, uint64_t size, int type, zio_priority_t priority,
517 520 enum zio_flag flags, zio_done_func_t *done, void *private);
518 521
519 522 extern void zio_vdev_io_bypass(zio_t *zio);
520 523 extern void zio_vdev_io_reissue(zio_t *zio);
521 524 extern void zio_vdev_io_redone(zio_t *zio);
522 525
523 526 extern void zio_checksum_verified(zio_t *zio);
524 527 extern int zio_worst_error(int e1, int e2);
525 528
526 529 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
527 530 enum zio_checksum parent);
528 531 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
529 532 enum zio_checksum child, enum zio_checksum parent);
530 533 extern enum zio_compress zio_compress_select(enum zio_compress child,
531 534 enum zio_compress parent);
532 535
533 536 extern void zio_suspend(spa_t *spa, zio_t *zio);
534 537 extern int zio_resume(spa_t *spa);
535 538 extern void zio_resume_wait(spa_t *spa);
536 539
537 540 /*
538 541 * Initial setup and teardown.
539 542 */
540 543 extern void zio_init(void);
541 544 extern void zio_fini(void);
542 545
543 546 /*
544 547 * Fault injection
545 548 */
546 549 struct zinject_record;
547 550 extern uint32_t zio_injection_enabled;
548 551 extern int zio_inject_fault(char *name, int flags, int *id,
549 552 struct zinject_record *record);
550 553 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
551 554 struct zinject_record *record);
552 555 extern int zio_clear_fault(int id);
553 556 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
554 557 extern int zio_handle_fault_injection(zio_t *zio, int error);
555 558 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
556 559 extern int zio_handle_label_injection(zio_t *zio, int error);
557 560 extern void zio_handle_ignored_writes(zio_t *zio);
558 561 extern uint64_t zio_handle_io_delay(zio_t *zio);
559 562
560 563 /*
561 564 * Checksum ereport functions
562 565 */
563 566 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
564 567 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
565 568 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
566 569 const void *good_data, const void *bad_data, boolean_t drop_if_identical);
567 570
568 571 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
569 572 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
570 573
571 574 /* If we have the good data in hand, this function can be used */
572 575 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
573 576 struct zio *zio, uint64_t offset, uint64_t length,
574 577 const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
575 578
576 579 /* Called from spa_sync(), but primarily an injection handler */
577 580 extern void spa_handle_ignored_writes(spa_t *spa);
578 581
579 582 /* zbookmark functions */
580 583 boolean_t zbookmark_is_before(const struct dnode_phys *dnp,
581 584 const zbookmark_t *zb1, const zbookmark_t *zb2);
582 585
583 586 #ifdef __cplusplus
584 587 }
585 588 #endif
586 589
587 590 #endif /* _ZIO_H */
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