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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) 2012, 2014 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,
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 84 ZIO_CHECKSUM_FUNCTIONS
85 85 };
86 86
87 87 /*
88 88 * The number of "legacy" compression functions which can be set on individual
89 89 * objects.
90 90 */
91 91 #define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2
92 92
93 93 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4
94 94 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON
95 95
96 96 #define ZIO_CHECKSUM_MASK 0xffULL
97 97 #define ZIO_CHECKSUM_VERIFY (1 << 8)
98 98
99 99 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256
100 100 #define ZIO_DEDUPDITTO_MIN 100
101 101
102 102 enum zio_compress {
103 103 ZIO_COMPRESS_INHERIT = 0,
104 104 ZIO_COMPRESS_ON,
105 105 ZIO_COMPRESS_OFF,
106 106 ZIO_COMPRESS_LZJB,
107 107 ZIO_COMPRESS_EMPTY,
108 108 ZIO_COMPRESS_GZIP_1,
109 109 ZIO_COMPRESS_GZIP_2,
110 110 ZIO_COMPRESS_GZIP_3,
111 111 ZIO_COMPRESS_GZIP_4,
112 112 ZIO_COMPRESS_GZIP_5,
113 113 ZIO_COMPRESS_GZIP_6,
114 114 ZIO_COMPRESS_GZIP_7,
115 115 ZIO_COMPRESS_GZIP_8,
116 116 ZIO_COMPRESS_GZIP_9,
117 117 ZIO_COMPRESS_ZLE,
118 118 ZIO_COMPRESS_LZ4,
119 119 ZIO_COMPRESS_FUNCTIONS
120 120 };
121 121
122 122 /*
123 123 * The number of "legacy" compression functions which can be set on individual
124 124 * objects.
125 125 */
126 126 #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4
127 127
128 128 /* N.B. when altering this value, also change BOOTFS_COMPRESS_VALID below */
129 129 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB
130 130 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF
131 131
132 132 #define BOOTFS_COMPRESS_VALID(compress) \
133 133 ((compress) == ZIO_COMPRESS_LZJB || \
134 134 (compress) == ZIO_COMPRESS_LZ4 || \
135 135 ((compress) == ZIO_COMPRESS_ON && \
136 136 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \
137 137 (compress) == ZIO_COMPRESS_OFF)
138 138
139 139 #define ZIO_FAILURE_MODE_WAIT 0
140 140 #define ZIO_FAILURE_MODE_CONTINUE 1
141 141 #define ZIO_FAILURE_MODE_PANIC 2
142 142
143 143 typedef enum zio_priority {
144 144 ZIO_PRIORITY_SYNC_READ,
145 145 ZIO_PRIORITY_SYNC_WRITE, /* ZIL */
146 146 ZIO_PRIORITY_ASYNC_READ, /* prefetch */
147 147 ZIO_PRIORITY_ASYNC_WRITE, /* spa_sync() */
148 148 ZIO_PRIORITY_SCRUB, /* asynchronous scrub/resilver reads */
149 149 ZIO_PRIORITY_NUM_QUEUEABLE,
150 150
151 151 ZIO_PRIORITY_NOW /* non-queued i/os (e.g. free) */
152 152 } zio_priority_t;
153 153
154 154 enum zio_flag {
155 155 /*
156 156 * Flags inherited by gang, ddt, and vdev children,
157 157 * and that must be equal for two zios to aggregate
158 158 */
159 159 ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
160 160 ZIO_FLAG_IO_REPAIR = 1 << 1,
161 161 ZIO_FLAG_SELF_HEAL = 1 << 2,
162 162 ZIO_FLAG_RESILVER = 1 << 3,
163 163 ZIO_FLAG_SCRUB = 1 << 4,
164 164 ZIO_FLAG_SCAN_THREAD = 1 << 5,
165 165 ZIO_FLAG_PHYSICAL = 1 << 6,
166 166
167 167 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
168 168
169 169 /*
170 170 * Flags inherited by ddt, gang, and vdev children.
171 171 */
172 172 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */
173 173 ZIO_FLAG_SPECULATIVE = 1 << 8,
174 174 ZIO_FLAG_CONFIG_WRITER = 1 << 9,
175 175 ZIO_FLAG_DONT_RETRY = 1 << 10,
176 176 ZIO_FLAG_DONT_CACHE = 1 << 11,
177 177 ZIO_FLAG_NODATA = 1 << 12,
178 178 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13,
179 179
180 180 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
181 181 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)
182 182
183 183 /*
184 184 * Flags inherited by vdev children.
185 185 */
186 186 ZIO_FLAG_IO_RETRY = 1 << 14, /* must be first for INHERIT */
187 187 ZIO_FLAG_PROBE = 1 << 15,
188 188 ZIO_FLAG_TRYHARD = 1 << 16,
189 189 ZIO_FLAG_OPTIONAL = 1 << 17,
190 190
191 191 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
192 192
193 193 /*
194 194 * Flags not inherited by any children.
195 195 */
196 196 ZIO_FLAG_DONT_QUEUE = 1 << 18, /* must be first for INHERIT */
197 197 ZIO_FLAG_DONT_PROPAGATE = 1 << 19,
198 198 ZIO_FLAG_IO_BYPASS = 1 << 20,
199 199 ZIO_FLAG_IO_REWRITE = 1 << 21,
200 200 ZIO_FLAG_RAW = 1 << 22,
201 201 ZIO_FLAG_GANG_CHILD = 1 << 23,
202 202 ZIO_FLAG_DDT_CHILD = 1 << 24,
203 203 ZIO_FLAG_GODFATHER = 1 << 25,
204 204 ZIO_FLAG_NOPWRITE = 1 << 26,
205 205 ZIO_FLAG_REEXECUTED = 1 << 27,
206 206 ZIO_FLAG_DELEGATED = 1 << 28,
207 207 };
208 208
209 209 #define ZIO_FLAG_MUSTSUCCEED 0
210 210
211 211 #define ZIO_DDT_CHILD_FLAGS(zio) \
212 212 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \
213 213 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
214 214
215 215 #define ZIO_GANG_CHILD_FLAGS(zio) \
216 216 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \
217 217 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
218 218
219 219 #define ZIO_VDEV_CHILD_FLAGS(zio) \
220 220 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \
221 221 ZIO_FLAG_CANFAIL)
222 222
223 223 enum zio_child {
224 224 ZIO_CHILD_VDEV = 0,
225 225 ZIO_CHILD_GANG,
226 226 ZIO_CHILD_DDT,
227 227 ZIO_CHILD_LOGICAL,
228 228 ZIO_CHILD_TYPES
229 229 };
230 230
231 231 enum zio_wait_type {
232 232 ZIO_WAIT_READY = 0,
233 233 ZIO_WAIT_DONE,
234 234 ZIO_WAIT_TYPES
235 235 };
236 236
237 237 /*
238 238 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
239 239 * graveyard) to indicate checksum errors and fragmentation.
240 240 */
241 241 #define ECKSUM EBADE
242 242 #define EFRAGS EBADR
243 243
244 244 typedef void zio_done_func_t(zio_t *zio);
245 245
246 246 extern const char *zio_type_name[ZIO_TYPES];
247 247
248 248 /*
249 249 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
250 250 * identifies any block in the pool. By convention, the meta-objset (MOS)
251 251 * is objset 0, and the meta-dnode is object 0. This covers all blocks
252 252 * except root blocks and ZIL blocks, which are defined as follows:
253 253 *
254 254 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
255 255 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
256 256 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
257 257 *
258 258 * Note: this structure is called a bookmark because its original purpose
259 259 * was to remember where to resume a pool-wide traverse.
260 260 *
261 261 * Note: this structure is passed between userland and the kernel, and is
262 262 * stored on disk (by virtue of being incorporated into other on-disk
263 263 * structures, e.g. dsl_scan_phys_t).
264 264 */
265 265 typedef struct zbookmark_phys {
266 266 uint64_t zb_objset;
267 267 uint64_t zb_object;
268 268 int64_t zb_level;
269 269 uint64_t zb_blkid;
270 270 } zbookmark_phys_t;
271 271
272 272 #define SET_BOOKMARK(zb, objset, object, level, blkid) \
273 273 { \
274 274 (zb)->zb_objset = objset; \
275 275 (zb)->zb_object = object; \
276 276 (zb)->zb_level = level; \
277 277 (zb)->zb_blkid = blkid; \
278 278 }
279 279
280 280 #define ZB_DESTROYED_OBJSET (-1ULL)
281 281
282 282 #define ZB_ROOT_OBJECT (0ULL)
283 283 #define ZB_ROOT_LEVEL (-1LL)
284 284 #define ZB_ROOT_BLKID (0ULL)
285 285
286 286 #define ZB_ZIL_OBJECT (0ULL)
287 287 #define ZB_ZIL_LEVEL (-2LL)
288 288
289 289 #define ZB_IS_ZERO(zb) \
290 290 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \
291 291 (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
292 292 #define ZB_IS_ROOT(zb) \
293 293 ((zb)->zb_object == ZB_ROOT_OBJECT && \
294 294 (zb)->zb_level == ZB_ROOT_LEVEL && \
295 295 (zb)->zb_blkid == ZB_ROOT_BLKID)
296 296
297 297 typedef struct zio_prop {
298 298 enum zio_checksum zp_checksum;
299 299 enum zio_compress zp_compress;
300 300 dmu_object_type_t zp_type;
301 301 uint8_t zp_level;
302 302 uint8_t zp_copies;
303 303 boolean_t zp_dedup;
304 304 boolean_t zp_dedup_verify;
305 305 boolean_t zp_nopwrite;
306 306 } zio_prop_t;
307 307
308 308 typedef struct zio_cksum_report zio_cksum_report_t;
309 309
310 310 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
311 311 const void *good_data);
312 312 typedef void zio_cksum_free_f(void *cbdata, size_t size);
313 313
314 314 struct zio_bad_cksum; /* defined in zio_checksum.h */
315 315 struct dnode_phys;
316 316
317 317 struct zio_cksum_report {
318 318 struct zio_cksum_report *zcr_next;
319 319 nvlist_t *zcr_ereport;
320 320 nvlist_t *zcr_detector;
321 321 void *zcr_cbdata;
322 322 size_t zcr_cbinfo; /* passed to zcr_free() */
323 323 uint64_t zcr_align;
324 324 uint64_t zcr_length;
325 325 zio_cksum_finish_f *zcr_finish;
326 326 zio_cksum_free_f *zcr_free;
327 327
328 328 /* internal use only */
329 329 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */
330 330 };
331 331
332 332 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
333 333 void *arg);
334 334
335 335 zio_vsd_cksum_report_f zio_vsd_default_cksum_report;
336 336
337 337 typedef struct zio_vsd_ops {
338 338 zio_done_func_t *vsd_free;
339 339 zio_vsd_cksum_report_f *vsd_cksum_report;
340 340 } zio_vsd_ops_t;
341 341
342 342 typedef struct zio_gang_node {
343 343 zio_gbh_phys_t *gn_gbh;
344 344 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
345 345 } zio_gang_node_t;
346 346
347 347 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
348 348 zio_gang_node_t *gn, void *data);
349 349
350 350 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
351 351
352 352 typedef struct zio_transform {
353 353 void *zt_orig_data;
354 354 uint64_t zt_orig_size;
355 355 uint64_t zt_bufsize;
356 356 zio_transform_func_t *zt_transform;
357 357 struct zio_transform *zt_next;
358 358 } zio_transform_t;
359 359
360 360 typedef int zio_pipe_stage_t(zio_t *zio);
361 361
362 362 /*
363 363 * The io_reexecute flags are distinct from io_flags because the child must
364 364 * be able to propagate them to the parent. The normal io_flags are local
365 365 * to the zio, not protected by any lock, and not modifiable by children;
366 366 * the reexecute flags are protected by io_lock, modifiable by children,
367 367 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
368 368 */
369 369 #define ZIO_REEXECUTE_NOW 0x01
370 370 #define ZIO_REEXECUTE_SUSPEND 0x02
371 371
372 372 typedef struct zio_link {
373 373 zio_t *zl_parent;
374 374 zio_t *zl_child;
375 375 list_node_t zl_parent_node;
376 376 list_node_t zl_child_node;
377 377 } zio_link_t;
378 378
379 379 struct zio {
380 380 /* Core information about this I/O */
381 381 zbookmark_phys_t io_bookmark;
382 382 zio_prop_t io_prop;
383 383 zio_type_t io_type;
384 384 enum zio_child io_child_type;
385 385 int io_cmd;
386 386 zio_priority_t io_priority;
387 387 uint8_t io_reexecute;
388 388 uint8_t io_state[ZIO_WAIT_TYPES];
389 389 uint64_t io_txg;
390 390 spa_t *io_spa;
391 391 blkptr_t *io_bp;
392 392 blkptr_t *io_bp_override;
393 393 blkptr_t io_bp_copy;
394 394 list_t io_parent_list;
395 395 list_t io_child_list;
396 396 zio_link_t *io_walk_link;
397 397 zio_t *io_logical;
398 398 zio_transform_t *io_transform_stack;
399 399
400 400 /* Callback info */
401 401 zio_done_func_t *io_ready;
402 402 zio_done_func_t *io_physdone;
403 403 zio_done_func_t *io_done;
404 404 void *io_private;
405 405 int64_t io_prev_space_delta; /* DMU private */
406 406 blkptr_t io_bp_orig;
407 407
408 408 /* Data represented by this I/O */
409 409 void *io_data;
410 410 void *io_orig_data;
411 411 uint64_t io_size;
412 412 uint64_t io_orig_size;
413 413
414 414 /* Stuff for the vdev stack */
415 415 vdev_t *io_vd;
416 416 void *io_vsd;
417 417 const zio_vsd_ops_t *io_vsd_ops;
418 418
419 419 uint64_t io_offset;
420 420 hrtime_t io_timestamp;
421 421 avl_node_t io_queue_node;
422 422
423 423 /* Internal pipeline state */
424 424 enum zio_flag io_flags;
425 425 enum zio_stage io_stage;
426 426 enum zio_stage io_pipeline;
427 427 enum zio_flag io_orig_flags;
428 428 enum zio_stage io_orig_stage;
429 429 enum zio_stage io_orig_pipeline;
430 430 int io_error;
431 431 int io_child_error[ZIO_CHILD_TYPES];
432 432 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
433 433 uint64_t io_child_count;
434 434 uint64_t io_phys_children;
435 435 uint64_t io_parent_count;
436 436 uint64_t *io_stall;
437 437 zio_t *io_gang_leader;
438 438 zio_gang_node_t *io_gang_tree;
439 439 void *io_executor;
440 440 void *io_waiter;
441 441 kmutex_t io_lock;
442 442 kcondvar_t io_cv;
443 443
444 444 /* FMA state */
445 445 zio_cksum_report_t *io_cksum_report;
446 446 uint64_t io_ena;
447 447
448 448 /* Taskq dispatching state */
449 449 taskq_ent_t io_tqent;
450 450 };
451 451
452 452 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
453 453 zio_done_func_t *done, void *private, enum zio_flag flags);
454 454
455 455 extern zio_t *zio_root(spa_t *spa,
456 456 zio_done_func_t *done, void *private, enum zio_flag flags);
457 457
458 458 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
459 459 uint64_t size, zio_done_func_t *done, void *private,
460 460 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);
461 461
462 462 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
463 463 void *data, uint64_t size, const zio_prop_t *zp,
464 464 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done,
465 465 void *private,
466 466 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);
467 467
468 468 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
469 469 void *data, uint64_t size, zio_done_func_t *done, void *private,
470 470 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb);
471 471
472 472 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
473 473 boolean_t nopwrite);
474 474
475 475 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
476 476
477 477 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
478 478 const blkptr_t *bp,
479 479 zio_done_func_t *done, void *private, enum zio_flag flags);
480 480
481 481 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
482 482 zio_done_func_t *done, void *private, enum zio_flag flags);
483 483
484 484 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
485 485 uint64_t size, void *data, int checksum,
486 486 zio_done_func_t *done, void *private, zio_priority_t priority,
487 487 enum zio_flag flags, boolean_t labels);
488 488
489 489 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
490 490 uint64_t size, void *data, int checksum,
491 491 zio_done_func_t *done, void *private, zio_priority_t priority,
492 492 enum zio_flag flags, boolean_t labels);
493 493
494 494 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
495 495 const blkptr_t *bp, enum zio_flag flags);
496 496
497 497 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
498 498 blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
499 499 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
500 500 extern void zio_flush(zio_t *zio, vdev_t *vd);
501 501 extern void zio_shrink(zio_t *zio, uint64_t size);
502 502
503 503 extern int zio_wait(zio_t *zio);
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504 504 extern void zio_nowait(zio_t *zio);
505 505 extern void zio_execute(zio_t *zio);
506 506 extern void zio_interrupt(zio_t *zio);
507 507
508 508 extern zio_t *zio_walk_parents(zio_t *cio);
509 509 extern zio_t *zio_walk_children(zio_t *pio);
510 510 extern zio_t *zio_unique_parent(zio_t *cio);
511 511 extern void zio_add_child(zio_t *pio, zio_t *cio);
512 512
513 513 extern void *zio_buf_alloc(size_t size);
514 +extern void *zio_buf_alloc_canfail(size_t size);
514 515 extern void zio_buf_free(void *buf, size_t size);
515 516 extern void *zio_data_buf_alloc(size_t size);
517 +extern void *zio_data_buf_alloc_canfail(size_t size);
516 518 extern void zio_data_buf_free(void *buf, size_t size);
517 519
518 520 extern void zio_resubmit_stage_async(void *);
519 521
520 522 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
521 523 uint64_t offset, void *data, uint64_t size, int type,
522 524 zio_priority_t priority, enum zio_flag flags,
523 525 zio_done_func_t *done, void *private);
524 526
525 527 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
526 528 void *data, uint64_t size, int type, zio_priority_t priority,
527 529 enum zio_flag flags, zio_done_func_t *done, void *private);
528 530
529 531 extern void zio_vdev_io_bypass(zio_t *zio);
530 532 extern void zio_vdev_io_reissue(zio_t *zio);
531 533 extern void zio_vdev_io_redone(zio_t *zio);
532 534
533 535 extern void zio_checksum_verified(zio_t *zio);
534 536 extern int zio_worst_error(int e1, int e2);
535 537
536 538 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
537 539 enum zio_checksum parent);
538 540 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
539 541 enum zio_checksum child, enum zio_checksum parent);
540 542 extern enum zio_compress zio_compress_select(enum zio_compress child,
541 543 enum zio_compress parent);
542 544
543 545 extern void zio_suspend(spa_t *spa, zio_t *zio);
544 546 extern int zio_resume(spa_t *spa);
545 547 extern void zio_resume_wait(spa_t *spa);
546 548
547 549 /*
548 550 * Initial setup and teardown.
549 551 */
550 552 extern void zio_init(void);
551 553 extern void zio_fini(void);
552 554
553 555 /*
554 556 * Fault injection
555 557 */
556 558 struct zinject_record;
557 559 extern uint32_t zio_injection_enabled;
558 560 extern int zio_inject_fault(char *name, int flags, int *id,
559 561 struct zinject_record *record);
560 562 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
561 563 struct zinject_record *record);
562 564 extern int zio_clear_fault(int id);
563 565 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
564 566 extern int zio_handle_fault_injection(zio_t *zio, int error);
565 567 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
566 568 extern int zio_handle_label_injection(zio_t *zio, int error);
567 569 extern void zio_handle_ignored_writes(zio_t *zio);
568 570 extern uint64_t zio_handle_io_delay(zio_t *zio);
569 571
570 572 /*
571 573 * Checksum ereport functions
572 574 */
573 575 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
574 576 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
575 577 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
576 578 const void *good_data, const void *bad_data, boolean_t drop_if_identical);
577 579
578 580 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
579 581 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
580 582
581 583 /* If we have the good data in hand, this function can be used */
582 584 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
583 585 struct zio *zio, uint64_t offset, uint64_t length,
584 586 const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
585 587
586 588 /* Called from spa_sync(), but primarily an injection handler */
587 589 extern void spa_handle_ignored_writes(spa_t *spa);
588 590
589 591 /* zbookmark_phys functions */
590 592 boolean_t zbookmark_is_before(const struct dnode_phys *dnp,
591 593 const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2);
592 594
593 595 #ifdef __cplusplus
594 596 }
595 597 #endif
596 598
597 599 #endif /* _ZIO_H */
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