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34dc7c2f BB |
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 | /* | |
428870ff | 22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
34dc7c2f BB |
23 | */ |
24 | ||
34dc7c2f BB |
25 | #include <sys/zfs_context.h> |
26 | #include <sys/fm/fs/zfs.h> | |
27 | #include <sys/spa.h> | |
28 | #include <sys/txg.h> | |
29 | #include <sys/spa_impl.h> | |
30 | #include <sys/vdev_impl.h> | |
31 | #include <sys/zio_impl.h> | |
32 | #include <sys/zio_compress.h> | |
33 | #include <sys/zio_checksum.h> | |
428870ff BB |
34 | #include <sys/dmu_objset.h> |
35 | #include <sys/arc.h> | |
36 | #include <sys/ddt.h> | |
34dc7c2f BB |
37 | |
38 | /* | |
39 | * ========================================================================== | |
40 | * I/O priority table | |
41 | * ========================================================================== | |
42 | */ | |
43 | uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE] = { | |
44 | 0, /* ZIO_PRIORITY_NOW */ | |
45 | 0, /* ZIO_PRIORITY_SYNC_READ */ | |
46 | 0, /* ZIO_PRIORITY_SYNC_WRITE */ | |
34dc7c2f | 47 | 0, /* ZIO_PRIORITY_LOG_WRITE */ |
428870ff BB |
48 | 1, /* ZIO_PRIORITY_CACHE_FILL */ |
49 | 1, /* ZIO_PRIORITY_AGG */ | |
50 | 4, /* ZIO_PRIORITY_FREE */ | |
51 | 4, /* ZIO_PRIORITY_ASYNC_WRITE */ | |
52 | 6, /* ZIO_PRIORITY_ASYNC_READ */ | |
34dc7c2f BB |
53 | 10, /* ZIO_PRIORITY_RESILVER */ |
54 | 20, /* ZIO_PRIORITY_SCRUB */ | |
428870ff | 55 | 2, /* ZIO_PRIORITY_DDT_PREFETCH */ |
34dc7c2f BB |
56 | }; |
57 | ||
58 | /* | |
59 | * ========================================================================== | |
60 | * I/O type descriptions | |
61 | * ========================================================================== | |
62 | */ | |
63 | char *zio_type_name[ZIO_TYPES] = { | |
428870ff BB |
64 | "zio_null", "zio_read", "zio_write", "zio_free", "zio_claim", |
65 | "zio_ioctl" | |
66 | }; | |
34dc7c2f BB |
67 | |
68 | /* | |
69 | * ========================================================================== | |
70 | * I/O kmem caches | |
71 | * ========================================================================== | |
72 | */ | |
73 | kmem_cache_t *zio_cache; | |
d164b209 | 74 | kmem_cache_t *zio_link_cache; |
34dc7c2f BB |
75 | kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; |
76 | kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; | |
77 | ||
78 | #ifdef _KERNEL | |
79 | extern vmem_t *zio_alloc_arena; | |
80 | #endif | |
81 | ||
82 | /* | |
b128c09f BB |
83 | * An allocating zio is one that either currently has the DVA allocate |
84 | * stage set or will have it later in its lifetime. | |
34dc7c2f | 85 | */ |
428870ff BB |
86 | #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) |
87 | ||
88 | boolean_t zio_requeue_io_start_cut_in_line = B_TRUE; | |
89 | ||
90 | #ifdef ZFS_DEBUG | |
91 | int zio_buf_debug_limit = 16384; | |
92 | #else | |
93 | int zio_buf_debug_limit = 0; | |
94 | #endif | |
34dc7c2f BB |
95 | |
96 | void | |
97 | zio_init(void) | |
98 | { | |
99 | size_t c; | |
100 | vmem_t *data_alloc_arena = NULL; | |
101 | ||
102 | #ifdef _KERNEL | |
103 | data_alloc_arena = zio_alloc_arena; | |
104 | #endif | |
d164b209 BB |
105 | zio_cache = kmem_cache_create("zio_cache", |
106 | sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); | |
107 | zio_link_cache = kmem_cache_create("zio_link_cache", | |
108 | sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); | |
34dc7c2f BB |
109 | |
110 | /* | |
111 | * For small buffers, we want a cache for each multiple of | |
112 | * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache | |
113 | * for each quarter-power of 2. For large buffers, we want | |
114 | * a cache for each multiple of PAGESIZE. | |
115 | */ | |
116 | for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { | |
117 | size_t size = (c + 1) << SPA_MINBLOCKSHIFT; | |
118 | size_t p2 = size; | |
119 | size_t align = 0; | |
120 | ||
121 | while (p2 & (p2 - 1)) | |
122 | p2 &= p2 - 1; | |
123 | ||
124 | if (size <= 4 * SPA_MINBLOCKSIZE) { | |
125 | align = SPA_MINBLOCKSIZE; | |
126 | } else if (P2PHASE(size, PAGESIZE) == 0) { | |
127 | align = PAGESIZE; | |
128 | } else if (P2PHASE(size, p2 >> 2) == 0) { | |
129 | align = p2 >> 2; | |
130 | } | |
131 | ||
132 | if (align != 0) { | |
133 | char name[36]; | |
134 | (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); | |
135 | zio_buf_cache[c] = kmem_cache_create(name, size, | |
428870ff BB |
136 | align, NULL, NULL, NULL, NULL, NULL, |
137 | size > zio_buf_debug_limit ? KMC_NODEBUG : 0); | |
34dc7c2f BB |
138 | |
139 | (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); | |
140 | zio_data_buf_cache[c] = kmem_cache_create(name, size, | |
141 | align, NULL, NULL, NULL, NULL, data_alloc_arena, | |
428870ff | 142 | size > zio_buf_debug_limit ? KMC_NODEBUG : 0); |
34dc7c2f BB |
143 | } |
144 | } | |
145 | ||
146 | while (--c != 0) { | |
147 | ASSERT(zio_buf_cache[c] != NULL); | |
148 | if (zio_buf_cache[c - 1] == NULL) | |
149 | zio_buf_cache[c - 1] = zio_buf_cache[c]; | |
150 | ||
151 | ASSERT(zio_data_buf_cache[c] != NULL); | |
152 | if (zio_data_buf_cache[c - 1] == NULL) | |
153 | zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; | |
154 | } | |
155 | ||
34dc7c2f BB |
156 | zio_inject_init(); |
157 | } | |
158 | ||
159 | void | |
160 | zio_fini(void) | |
161 | { | |
162 | size_t c; | |
163 | kmem_cache_t *last_cache = NULL; | |
164 | kmem_cache_t *last_data_cache = NULL; | |
165 | ||
166 | for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { | |
167 | if (zio_buf_cache[c] != last_cache) { | |
168 | last_cache = zio_buf_cache[c]; | |
169 | kmem_cache_destroy(zio_buf_cache[c]); | |
170 | } | |
171 | zio_buf_cache[c] = NULL; | |
172 | ||
173 | if (zio_data_buf_cache[c] != last_data_cache) { | |
174 | last_data_cache = zio_data_buf_cache[c]; | |
175 | kmem_cache_destroy(zio_data_buf_cache[c]); | |
176 | } | |
177 | zio_data_buf_cache[c] = NULL; | |
178 | } | |
179 | ||
d164b209 | 180 | kmem_cache_destroy(zio_link_cache); |
34dc7c2f BB |
181 | kmem_cache_destroy(zio_cache); |
182 | ||
183 | zio_inject_fini(); | |
184 | } | |
185 | ||
186 | /* | |
187 | * ========================================================================== | |
188 | * Allocate and free I/O buffers | |
189 | * ========================================================================== | |
190 | */ | |
191 | ||
192 | /* | |
193 | * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a | |
194 | * crashdump if the kernel panics, so use it judiciously. Obviously, it's | |
195 | * useful to inspect ZFS metadata, but if possible, we should avoid keeping | |
196 | * excess / transient data in-core during a crashdump. | |
197 | */ | |
198 | void * | |
199 | zio_buf_alloc(size_t size) | |
200 | { | |
201 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
202 | ||
203 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
204 | ||
205 | return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); | |
206 | } | |
207 | ||
208 | /* | |
209 | * Use zio_data_buf_alloc to allocate data. The data will not appear in a | |
210 | * crashdump if the kernel panics. This exists so that we will limit the amount | |
211 | * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount | |
212 | * of kernel heap dumped to disk when the kernel panics) | |
213 | */ | |
214 | void * | |
215 | zio_data_buf_alloc(size_t size) | |
216 | { | |
217 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
218 | ||
219 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
220 | ||
221 | return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); | |
222 | } | |
223 | ||
224 | void | |
225 | zio_buf_free(void *buf, size_t size) | |
226 | { | |
227 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
228 | ||
229 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
230 | ||
231 | kmem_cache_free(zio_buf_cache[c], buf); | |
232 | } | |
233 | ||
234 | void | |
235 | zio_data_buf_free(void *buf, size_t size) | |
236 | { | |
237 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
238 | ||
239 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
240 | ||
241 | kmem_cache_free(zio_data_buf_cache[c], buf); | |
242 | } | |
243 | ||
244 | /* | |
245 | * ========================================================================== | |
246 | * Push and pop I/O transform buffers | |
247 | * ========================================================================== | |
248 | */ | |
249 | static void | |
b128c09f BB |
250 | zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, |
251 | zio_transform_func_t *transform) | |
34dc7c2f BB |
252 | { |
253 | zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); | |
254 | ||
b128c09f BB |
255 | zt->zt_orig_data = zio->io_data; |
256 | zt->zt_orig_size = zio->io_size; | |
34dc7c2f | 257 | zt->zt_bufsize = bufsize; |
b128c09f | 258 | zt->zt_transform = transform; |
34dc7c2f BB |
259 | |
260 | zt->zt_next = zio->io_transform_stack; | |
261 | zio->io_transform_stack = zt; | |
262 | ||
263 | zio->io_data = data; | |
264 | zio->io_size = size; | |
265 | } | |
266 | ||
267 | static void | |
b128c09f | 268 | zio_pop_transforms(zio_t *zio) |
34dc7c2f | 269 | { |
b128c09f BB |
270 | zio_transform_t *zt; |
271 | ||
272 | while ((zt = zio->io_transform_stack) != NULL) { | |
273 | if (zt->zt_transform != NULL) | |
274 | zt->zt_transform(zio, | |
275 | zt->zt_orig_data, zt->zt_orig_size); | |
34dc7c2f | 276 | |
428870ff BB |
277 | if (zt->zt_bufsize != 0) |
278 | zio_buf_free(zio->io_data, zt->zt_bufsize); | |
34dc7c2f | 279 | |
b128c09f BB |
280 | zio->io_data = zt->zt_orig_data; |
281 | zio->io_size = zt->zt_orig_size; | |
282 | zio->io_transform_stack = zt->zt_next; | |
34dc7c2f | 283 | |
b128c09f | 284 | kmem_free(zt, sizeof (zio_transform_t)); |
34dc7c2f BB |
285 | } |
286 | } | |
287 | ||
b128c09f BB |
288 | /* |
289 | * ========================================================================== | |
290 | * I/O transform callbacks for subblocks and decompression | |
291 | * ========================================================================== | |
292 | */ | |
293 | static void | |
294 | zio_subblock(zio_t *zio, void *data, uint64_t size) | |
295 | { | |
296 | ASSERT(zio->io_size > size); | |
297 | ||
298 | if (zio->io_type == ZIO_TYPE_READ) | |
299 | bcopy(zio->io_data, data, size); | |
300 | } | |
301 | ||
302 | static void | |
303 | zio_decompress(zio_t *zio, void *data, uint64_t size) | |
304 | { | |
305 | if (zio->io_error == 0 && | |
306 | zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), | |
428870ff | 307 | zio->io_data, data, zio->io_size, size) != 0) |
b128c09f BB |
308 | zio->io_error = EIO; |
309 | } | |
310 | ||
311 | /* | |
312 | * ========================================================================== | |
313 | * I/O parent/child relationships and pipeline interlocks | |
314 | * ========================================================================== | |
315 | */ | |
d164b209 BB |
316 | /* |
317 | * NOTE - Callers to zio_walk_parents() and zio_walk_children must | |
318 | * continue calling these functions until they return NULL. | |
319 | * Otherwise, the next caller will pick up the list walk in | |
320 | * some indeterminate state. (Otherwise every caller would | |
321 | * have to pass in a cookie to keep the state represented by | |
322 | * io_walk_link, which gets annoying.) | |
323 | */ | |
324 | zio_t * | |
325 | zio_walk_parents(zio_t *cio) | |
326 | { | |
327 | zio_link_t *zl = cio->io_walk_link; | |
328 | list_t *pl = &cio->io_parent_list; | |
b128c09f | 329 | |
d164b209 BB |
330 | zl = (zl == NULL) ? list_head(pl) : list_next(pl, zl); |
331 | cio->io_walk_link = zl; | |
332 | ||
333 | if (zl == NULL) | |
334 | return (NULL); | |
335 | ||
336 | ASSERT(zl->zl_child == cio); | |
337 | return (zl->zl_parent); | |
338 | } | |
339 | ||
340 | zio_t * | |
341 | zio_walk_children(zio_t *pio) | |
342 | { | |
343 | zio_link_t *zl = pio->io_walk_link; | |
344 | list_t *cl = &pio->io_child_list; | |
345 | ||
346 | zl = (zl == NULL) ? list_head(cl) : list_next(cl, zl); | |
347 | pio->io_walk_link = zl; | |
348 | ||
349 | if (zl == NULL) | |
350 | return (NULL); | |
351 | ||
352 | ASSERT(zl->zl_parent == pio); | |
353 | return (zl->zl_child); | |
354 | } | |
355 | ||
356 | zio_t * | |
357 | zio_unique_parent(zio_t *cio) | |
358 | { | |
359 | zio_t *pio = zio_walk_parents(cio); | |
360 | ||
361 | VERIFY(zio_walk_parents(cio) == NULL); | |
362 | return (pio); | |
363 | } | |
364 | ||
365 | void | |
366 | zio_add_child(zio_t *pio, zio_t *cio) | |
b128c09f | 367 | { |
d164b209 | 368 | zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); |
d6320ddb | 369 | int w; |
d164b209 BB |
370 | |
371 | /* | |
372 | * Logical I/Os can have logical, gang, or vdev children. | |
373 | * Gang I/Os can have gang or vdev children. | |
374 | * Vdev I/Os can only have vdev children. | |
375 | * The following ASSERT captures all of these constraints. | |
376 | */ | |
377 | ASSERT(cio->io_child_type <= pio->io_child_type); | |
378 | ||
379 | zl->zl_parent = pio; | |
380 | zl->zl_child = cio; | |
381 | ||
382 | mutex_enter(&cio->io_lock); | |
b128c09f | 383 | mutex_enter(&pio->io_lock); |
d164b209 BB |
384 | |
385 | ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); | |
386 | ||
d6320ddb | 387 | for (w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 BB |
388 | pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; |
389 | ||
390 | list_insert_head(&pio->io_child_list, zl); | |
391 | list_insert_head(&cio->io_parent_list, zl); | |
392 | ||
428870ff BB |
393 | pio->io_child_count++; |
394 | cio->io_parent_count++; | |
395 | ||
b128c09f | 396 | mutex_exit(&pio->io_lock); |
d164b209 | 397 | mutex_exit(&cio->io_lock); |
b128c09f BB |
398 | } |
399 | ||
34dc7c2f | 400 | static void |
d164b209 | 401 | zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) |
b128c09f | 402 | { |
d164b209 BB |
403 | ASSERT(zl->zl_parent == pio); |
404 | ASSERT(zl->zl_child == cio); | |
b128c09f | 405 | |
d164b209 | 406 | mutex_enter(&cio->io_lock); |
b128c09f | 407 | mutex_enter(&pio->io_lock); |
d164b209 BB |
408 | |
409 | list_remove(&pio->io_child_list, zl); | |
410 | list_remove(&cio->io_parent_list, zl); | |
411 | ||
428870ff BB |
412 | pio->io_child_count--; |
413 | cio->io_parent_count--; | |
414 | ||
b128c09f | 415 | mutex_exit(&pio->io_lock); |
d164b209 BB |
416 | mutex_exit(&cio->io_lock); |
417 | ||
418 | kmem_cache_free(zio_link_cache, zl); | |
b128c09f BB |
419 | } |
420 | ||
421 | static boolean_t | |
422 | zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) | |
34dc7c2f | 423 | { |
b128c09f BB |
424 | uint64_t *countp = &zio->io_children[child][wait]; |
425 | boolean_t waiting = B_FALSE; | |
426 | ||
427 | mutex_enter(&zio->io_lock); | |
428 | ASSERT(zio->io_stall == NULL); | |
429 | if (*countp != 0) { | |
428870ff | 430 | zio->io_stage >>= 1; |
b128c09f BB |
431 | zio->io_stall = countp; |
432 | waiting = B_TRUE; | |
433 | } | |
434 | mutex_exit(&zio->io_lock); | |
435 | ||
436 | return (waiting); | |
437 | } | |
34dc7c2f | 438 | |
b128c09f BB |
439 | static void |
440 | zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) | |
441 | { | |
442 | uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; | |
443 | int *errorp = &pio->io_child_error[zio->io_child_type]; | |
34dc7c2f | 444 | |
b128c09f BB |
445 | mutex_enter(&pio->io_lock); |
446 | if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) | |
447 | *errorp = zio_worst_error(*errorp, zio->io_error); | |
448 | pio->io_reexecute |= zio->io_reexecute; | |
449 | ASSERT3U(*countp, >, 0); | |
450 | if (--*countp == 0 && pio->io_stall == countp) { | |
451 | pio->io_stall = NULL; | |
452 | mutex_exit(&pio->io_lock); | |
453 | zio_execute(pio); | |
454 | } else { | |
455 | mutex_exit(&pio->io_lock); | |
34dc7c2f BB |
456 | } |
457 | } | |
458 | ||
b128c09f BB |
459 | static void |
460 | zio_inherit_child_errors(zio_t *zio, enum zio_child c) | |
461 | { | |
462 | if (zio->io_child_error[c] != 0 && zio->io_error == 0) | |
463 | zio->io_error = zio->io_child_error[c]; | |
464 | } | |
465 | ||
34dc7c2f BB |
466 | /* |
467 | * ========================================================================== | |
b128c09f | 468 | * Create the various types of I/O (read, write, free, etc) |
34dc7c2f BB |
469 | * ========================================================================== |
470 | */ | |
471 | static zio_t * | |
428870ff | 472 | zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
34dc7c2f | 473 | void *data, uint64_t size, zio_done_func_t *done, void *private, |
428870ff BB |
474 | zio_type_t type, int priority, enum zio_flag flags, |
475 | vdev_t *vd, uint64_t offset, const zbookmark_t *zb, | |
476 | enum zio_stage stage, enum zio_stage pipeline) | |
34dc7c2f BB |
477 | { |
478 | zio_t *zio; | |
479 | ||
480 | ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); | |
481 | ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); | |
b128c09f BB |
482 | ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); |
483 | ||
484 | ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); | |
485 | ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); | |
486 | ASSERT(vd || stage == ZIO_STAGE_OPEN); | |
34dc7c2f BB |
487 | |
488 | zio = kmem_cache_alloc(zio_cache, KM_SLEEP); | |
489 | bzero(zio, sizeof (zio_t)); | |
b128c09f BB |
490 | |
491 | mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); | |
492 | cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); | |
493 | ||
d164b209 BB |
494 | list_create(&zio->io_parent_list, sizeof (zio_link_t), |
495 | offsetof(zio_link_t, zl_parent_node)); | |
496 | list_create(&zio->io_child_list, sizeof (zio_link_t), | |
497 | offsetof(zio_link_t, zl_child_node)); | |
498 | ||
b128c09f BB |
499 | if (vd != NULL) |
500 | zio->io_child_type = ZIO_CHILD_VDEV; | |
501 | else if (flags & ZIO_FLAG_GANG_CHILD) | |
502 | zio->io_child_type = ZIO_CHILD_GANG; | |
428870ff BB |
503 | else if (flags & ZIO_FLAG_DDT_CHILD) |
504 | zio->io_child_type = ZIO_CHILD_DDT; | |
b128c09f BB |
505 | else |
506 | zio->io_child_type = ZIO_CHILD_LOGICAL; | |
507 | ||
34dc7c2f | 508 | if (bp != NULL) { |
428870ff | 509 | zio->io_bp = (blkptr_t *)bp; |
34dc7c2f BB |
510 | zio->io_bp_copy = *bp; |
511 | zio->io_bp_orig = *bp; | |
428870ff BB |
512 | if (type != ZIO_TYPE_WRITE || |
513 | zio->io_child_type == ZIO_CHILD_DDT) | |
b128c09f | 514 | zio->io_bp = &zio->io_bp_copy; /* so caller can free */ |
9babb374 | 515 | if (zio->io_child_type == ZIO_CHILD_LOGICAL) |
b128c09f | 516 | zio->io_logical = zio; |
9babb374 BB |
517 | if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) |
518 | pipeline |= ZIO_GANG_STAGES; | |
34dc7c2f | 519 | } |
b128c09f BB |
520 | |
521 | zio->io_spa = spa; | |
522 | zio->io_txg = txg; | |
34dc7c2f BB |
523 | zio->io_done = done; |
524 | zio->io_private = private; | |
525 | zio->io_type = type; | |
526 | zio->io_priority = priority; | |
b128c09f BB |
527 | zio->io_vd = vd; |
528 | zio->io_offset = offset; | |
428870ff BB |
529 | zio->io_orig_data = zio->io_data = data; |
530 | zio->io_orig_size = zio->io_size = size; | |
b128c09f BB |
531 | zio->io_orig_flags = zio->io_flags = flags; |
532 | zio->io_orig_stage = zio->io_stage = stage; | |
533 | zio->io_orig_pipeline = zio->io_pipeline = pipeline; | |
34dc7c2f | 534 | |
d164b209 BB |
535 | zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); |
536 | zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); | |
537 | ||
b128c09f BB |
538 | if (zb != NULL) |
539 | zio->io_bookmark = *zb; | |
540 | ||
541 | if (pio != NULL) { | |
b128c09f | 542 | if (zio->io_logical == NULL) |
34dc7c2f | 543 | zio->io_logical = pio->io_logical; |
9babb374 BB |
544 | if (zio->io_child_type == ZIO_CHILD_GANG) |
545 | zio->io_gang_leader = pio->io_gang_leader; | |
b128c09f | 546 | zio_add_child(pio, zio); |
34dc7c2f BB |
547 | } |
548 | ||
34dc7c2f BB |
549 | return (zio); |
550 | } | |
551 | ||
552 | static void | |
b128c09f | 553 | zio_destroy(zio_t *zio) |
34dc7c2f | 554 | { |
d164b209 BB |
555 | list_destroy(&zio->io_parent_list); |
556 | list_destroy(&zio->io_child_list); | |
b128c09f BB |
557 | mutex_destroy(&zio->io_lock); |
558 | cv_destroy(&zio->io_cv); | |
559 | kmem_cache_free(zio_cache, zio); | |
34dc7c2f BB |
560 | } |
561 | ||
562 | zio_t * | |
d164b209 | 563 | zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, |
428870ff | 564 | void *private, enum zio_flag flags) |
34dc7c2f BB |
565 | { |
566 | zio_t *zio; | |
567 | ||
568 | zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, | |
d164b209 | 569 | ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, |
b128c09f | 570 | ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); |
34dc7c2f BB |
571 | |
572 | return (zio); | |
573 | } | |
574 | ||
575 | zio_t * | |
428870ff | 576 | zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) |
34dc7c2f | 577 | { |
d164b209 | 578 | return (zio_null(NULL, spa, NULL, done, private, flags)); |
34dc7c2f BB |
579 | } |
580 | ||
581 | zio_t * | |
b128c09f BB |
582 | zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, |
583 | void *data, uint64_t size, zio_done_func_t *done, void *private, | |
428870ff | 584 | int priority, enum zio_flag flags, const zbookmark_t *zb) |
34dc7c2f BB |
585 | { |
586 | zio_t *zio; | |
587 | ||
428870ff | 588 | zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, |
b128c09f BB |
589 | data, size, done, private, |
590 | ZIO_TYPE_READ, priority, flags, NULL, 0, zb, | |
428870ff BB |
591 | ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? |
592 | ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); | |
34dc7c2f | 593 | |
b128c09f BB |
594 | return (zio); |
595 | } | |
34dc7c2f | 596 | |
34dc7c2f | 597 | zio_t * |
b128c09f | 598 | zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, |
428870ff | 599 | void *data, uint64_t size, const zio_prop_t *zp, |
b128c09f | 600 | zio_done_func_t *ready, zio_done_func_t *done, void *private, |
428870ff | 601 | int priority, enum zio_flag flags, const zbookmark_t *zb) |
34dc7c2f BB |
602 | { |
603 | zio_t *zio; | |
604 | ||
b128c09f BB |
605 | ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && |
606 | zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && | |
607 | zp->zp_compress >= ZIO_COMPRESS_OFF && | |
608 | zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && | |
609 | zp->zp_type < DMU_OT_NUMTYPES && | |
610 | zp->zp_level < 32 && | |
428870ff BB |
611 | zp->zp_copies > 0 && |
612 | zp->zp_copies <= spa_max_replication(spa) && | |
613 | zp->zp_dedup <= 1 && | |
614 | zp->zp_dedup_verify <= 1); | |
34dc7c2f BB |
615 | |
616 | zio = zio_create(pio, spa, txg, bp, data, size, done, private, | |
b128c09f | 617 | ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, |
428870ff BB |
618 | ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? |
619 | ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); | |
34dc7c2f BB |
620 | |
621 | zio->io_ready = ready; | |
b128c09f | 622 | zio->io_prop = *zp; |
34dc7c2f BB |
623 | |
624 | return (zio); | |
625 | } | |
626 | ||
627 | zio_t * | |
b128c09f BB |
628 | zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, |
629 | uint64_t size, zio_done_func_t *done, void *private, int priority, | |
428870ff | 630 | enum zio_flag flags, zbookmark_t *zb) |
34dc7c2f BB |
631 | { |
632 | zio_t *zio; | |
633 | ||
34dc7c2f | 634 | zio = zio_create(pio, spa, txg, bp, data, size, done, private, |
b128c09f BB |
635 | ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, |
636 | ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); | |
34dc7c2f BB |
637 | |
638 | return (zio); | |
639 | } | |
640 | ||
428870ff BB |
641 | void |
642 | zio_write_override(zio_t *zio, blkptr_t *bp, int copies) | |
643 | { | |
644 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); | |
645 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
646 | ASSERT(zio->io_stage == ZIO_STAGE_OPEN); | |
647 | ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); | |
648 | ||
649 | zio->io_prop.zp_copies = copies; | |
650 | zio->io_bp_override = bp; | |
651 | } | |
652 | ||
653 | void | |
654 | zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) | |
655 | { | |
656 | bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp); | |
657 | } | |
658 | ||
34dc7c2f | 659 | zio_t * |
428870ff BB |
660 | zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
661 | enum zio_flag flags) | |
34dc7c2f BB |
662 | { |
663 | zio_t *zio; | |
664 | ||
428870ff BB |
665 | dprintf_bp(bp, "freeing in txg %llu, pass %u", |
666 | (longlong_t)txg, spa->spa_sync_pass); | |
34dc7c2f | 667 | |
428870ff BB |
668 | ASSERT(!BP_IS_HOLE(bp)); |
669 | ASSERT(spa_syncing_txg(spa) == txg); | |
670 | ASSERT(spa_sync_pass(spa) <= SYNC_PASS_DEFERRED_FREE); | |
34dc7c2f | 671 | |
b128c09f | 672 | zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), |
428870ff | 673 | NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, flags, |
b128c09f | 674 | NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_FREE_PIPELINE); |
34dc7c2f BB |
675 | |
676 | return (zio); | |
677 | } | |
678 | ||
679 | zio_t * | |
428870ff BB |
680 | zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
681 | zio_done_func_t *done, void *private, enum zio_flag flags) | |
34dc7c2f BB |
682 | { |
683 | zio_t *zio; | |
684 | ||
685 | /* | |
686 | * A claim is an allocation of a specific block. Claims are needed | |
687 | * to support immediate writes in the intent log. The issue is that | |
688 | * immediate writes contain committed data, but in a txg that was | |
689 | * *not* committed. Upon opening the pool after an unclean shutdown, | |
690 | * the intent log claims all blocks that contain immediate write data | |
691 | * so that the SPA knows they're in use. | |
692 | * | |
693 | * All claims *must* be resolved in the first txg -- before the SPA | |
694 | * starts allocating blocks -- so that nothing is allocated twice. | |
428870ff | 695 | * If txg == 0 we just verify that the block is claimable. |
34dc7c2f BB |
696 | */ |
697 | ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); | |
428870ff BB |
698 | ASSERT(txg == spa_first_txg(spa) || txg == 0); |
699 | ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ | |
34dc7c2f | 700 | |
b128c09f BB |
701 | zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), |
702 | done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, | |
703 | NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); | |
34dc7c2f BB |
704 | |
705 | return (zio); | |
706 | } | |
707 | ||
708 | zio_t * | |
709 | zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, | |
428870ff | 710 | zio_done_func_t *done, void *private, int priority, enum zio_flag flags) |
34dc7c2f BB |
711 | { |
712 | zio_t *zio; | |
713 | int c; | |
714 | ||
715 | if (vd->vdev_children == 0) { | |
716 | zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, | |
b128c09f | 717 | ZIO_TYPE_IOCTL, priority, flags, vd, 0, NULL, |
34dc7c2f BB |
718 | ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); |
719 | ||
34dc7c2f BB |
720 | zio->io_cmd = cmd; |
721 | } else { | |
d164b209 | 722 | zio = zio_null(pio, spa, NULL, NULL, NULL, flags); |
34dc7c2f BB |
723 | |
724 | for (c = 0; c < vd->vdev_children; c++) | |
725 | zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, | |
726 | done, private, priority, flags)); | |
727 | } | |
728 | ||
729 | return (zio); | |
730 | } | |
731 | ||
34dc7c2f BB |
732 | zio_t * |
733 | zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, | |
734 | void *data, int checksum, zio_done_func_t *done, void *private, | |
428870ff | 735 | int priority, enum zio_flag flags, boolean_t labels) |
34dc7c2f BB |
736 | { |
737 | zio_t *zio; | |
34dc7c2f | 738 | |
b128c09f BB |
739 | ASSERT(vd->vdev_children == 0); |
740 | ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || | |
741 | offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); | |
742 | ASSERT3U(offset + size, <=, vd->vdev_psize); | |
34dc7c2f | 743 | |
b128c09f BB |
744 | zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, |
745 | ZIO_TYPE_READ, priority, flags, vd, offset, NULL, | |
34dc7c2f BB |
746 | ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); |
747 | ||
b128c09f | 748 | zio->io_prop.zp_checksum = checksum; |
34dc7c2f BB |
749 | |
750 | return (zio); | |
751 | } | |
752 | ||
753 | zio_t * | |
754 | zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, | |
755 | void *data, int checksum, zio_done_func_t *done, void *private, | |
428870ff | 756 | int priority, enum zio_flag flags, boolean_t labels) |
34dc7c2f | 757 | { |
34dc7c2f | 758 | zio_t *zio; |
34dc7c2f | 759 | |
b128c09f BB |
760 | ASSERT(vd->vdev_children == 0); |
761 | ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || | |
762 | offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); | |
763 | ASSERT3U(offset + size, <=, vd->vdev_psize); | |
34dc7c2f | 764 | |
b128c09f BB |
765 | zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, |
766 | ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL, | |
34dc7c2f BB |
767 | ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); |
768 | ||
b128c09f | 769 | zio->io_prop.zp_checksum = checksum; |
34dc7c2f | 770 | |
428870ff | 771 | if (zio_checksum_table[checksum].ci_eck) { |
34dc7c2f | 772 | /* |
428870ff | 773 | * zec checksums are necessarily destructive -- they modify |
b128c09f | 774 | * the end of the write buffer to hold the verifier/checksum. |
34dc7c2f | 775 | * Therefore, we must make a local copy in case the data is |
b128c09f | 776 | * being written to multiple places in parallel. |
34dc7c2f | 777 | */ |
b128c09f | 778 | void *wbuf = zio_buf_alloc(size); |
34dc7c2f | 779 | bcopy(data, wbuf, size); |
b128c09f | 780 | zio_push_transform(zio, wbuf, size, size, NULL); |
34dc7c2f BB |
781 | } |
782 | ||
783 | return (zio); | |
784 | } | |
785 | ||
786 | /* | |
b128c09f | 787 | * Create a child I/O to do some work for us. |
34dc7c2f BB |
788 | */ |
789 | zio_t * | |
b128c09f | 790 | zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, |
428870ff | 791 | void *data, uint64_t size, int type, int priority, enum zio_flag flags, |
34dc7c2f BB |
792 | zio_done_func_t *done, void *private) |
793 | { | |
428870ff | 794 | enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; |
b128c09f BB |
795 | zio_t *zio; |
796 | ||
797 | ASSERT(vd->vdev_parent == | |
798 | (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); | |
34dc7c2f BB |
799 | |
800 | if (type == ZIO_TYPE_READ && bp != NULL) { | |
801 | /* | |
802 | * If we have the bp, then the child should perform the | |
803 | * checksum and the parent need not. This pushes error | |
804 | * detection as close to the leaves as possible and | |
805 | * eliminates redundant checksums in the interior nodes. | |
806 | */ | |
428870ff BB |
807 | pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; |
808 | pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; | |
34dc7c2f BB |
809 | } |
810 | ||
b128c09f BB |
811 | if (vd->vdev_children == 0) |
812 | offset += VDEV_LABEL_START_SIZE; | |
813 | ||
428870ff BB |
814 | flags |= ZIO_VDEV_CHILD_FLAGS(pio) | ZIO_FLAG_DONT_PROPAGATE; |
815 | ||
816 | /* | |
817 | * If we've decided to do a repair, the write is not speculative -- | |
818 | * even if the original read was. | |
819 | */ | |
820 | if (flags & ZIO_FLAG_IO_REPAIR) | |
821 | flags &= ~ZIO_FLAG_SPECULATIVE; | |
822 | ||
b128c09f | 823 | zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, |
428870ff BB |
824 | done, private, type, priority, flags, vd, offset, &pio->io_bookmark, |
825 | ZIO_STAGE_VDEV_IO_START >> 1, pipeline); | |
34dc7c2f | 826 | |
b128c09f | 827 | return (zio); |
34dc7c2f BB |
828 | } |
829 | ||
b128c09f BB |
830 | zio_t * |
831 | zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, | |
428870ff BB |
832 | int type, int priority, enum zio_flag flags, |
833 | zio_done_func_t *done, void *private) | |
34dc7c2f | 834 | { |
b128c09f | 835 | zio_t *zio; |
34dc7c2f | 836 | |
b128c09f | 837 | ASSERT(vd->vdev_ops->vdev_op_leaf); |
34dc7c2f | 838 | |
b128c09f BB |
839 | zio = zio_create(NULL, vd->vdev_spa, 0, NULL, |
840 | data, size, done, private, type, priority, | |
841 | flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY, | |
842 | vd, offset, NULL, | |
428870ff | 843 | ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); |
34dc7c2f | 844 | |
b128c09f | 845 | return (zio); |
34dc7c2f BB |
846 | } |
847 | ||
848 | void | |
b128c09f | 849 | zio_flush(zio_t *zio, vdev_t *vd) |
34dc7c2f | 850 | { |
b128c09f BB |
851 | zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, |
852 | NULL, NULL, ZIO_PRIORITY_NOW, | |
853 | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); | |
34dc7c2f BB |
854 | } |
855 | ||
428870ff BB |
856 | void |
857 | zio_shrink(zio_t *zio, uint64_t size) | |
858 | { | |
859 | ASSERT(zio->io_executor == NULL); | |
860 | ASSERT(zio->io_orig_size == zio->io_size); | |
861 | ASSERT(size <= zio->io_size); | |
862 | ||
863 | /* | |
864 | * We don't shrink for raidz because of problems with the | |
865 | * reconstruction when reading back less than the block size. | |
866 | * Note, BP_IS_RAIDZ() assumes no compression. | |
867 | */ | |
868 | ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); | |
869 | if (!BP_IS_RAIDZ(zio->io_bp)) | |
870 | zio->io_orig_size = zio->io_size = size; | |
871 | } | |
872 | ||
34dc7c2f BB |
873 | /* |
874 | * ========================================================================== | |
b128c09f | 875 | * Prepare to read and write logical blocks |
34dc7c2f BB |
876 | * ========================================================================== |
877 | */ | |
b128c09f | 878 | |
34dc7c2f | 879 | static int |
b128c09f | 880 | zio_read_bp_init(zio_t *zio) |
34dc7c2f | 881 | { |
b128c09f | 882 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 883 | |
fb5f0bc8 | 884 | if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && |
9babb374 BB |
885 | zio->io_child_type == ZIO_CHILD_LOGICAL && |
886 | !(zio->io_flags & ZIO_FLAG_RAW)) { | |
428870ff BB |
887 | uint64_t psize = BP_GET_PSIZE(bp); |
888 | void *cbuf = zio_buf_alloc(psize); | |
b128c09f | 889 | |
428870ff | 890 | zio_push_transform(zio, cbuf, psize, psize, zio_decompress); |
34dc7c2f | 891 | } |
34dc7c2f | 892 | |
b128c09f BB |
893 | if (!dmu_ot[BP_GET_TYPE(bp)].ot_metadata && BP_GET_LEVEL(bp) == 0) |
894 | zio->io_flags |= ZIO_FLAG_DONT_CACHE; | |
895 | ||
428870ff BB |
896 | if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) |
897 | zio->io_flags |= ZIO_FLAG_DONT_CACHE; | |
898 | ||
899 | if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) | |
900 | zio->io_pipeline = ZIO_DDT_READ_PIPELINE; | |
901 | ||
b128c09f | 902 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
903 | } |
904 | ||
b128c09f BB |
905 | static int |
906 | zio_write_bp_init(zio_t *zio) | |
34dc7c2f | 907 | { |
428870ff | 908 | spa_t *spa = zio->io_spa; |
b128c09f | 909 | zio_prop_t *zp = &zio->io_prop; |
428870ff | 910 | enum zio_compress compress = zp->zp_compress; |
34dc7c2f | 911 | blkptr_t *bp = zio->io_bp; |
b128c09f | 912 | uint64_t lsize = zio->io_size; |
428870ff | 913 | uint64_t psize = lsize; |
b128c09f | 914 | int pass = 1; |
34dc7c2f | 915 | |
b128c09f BB |
916 | /* |
917 | * If our children haven't all reached the ready stage, | |
918 | * wait for them and then repeat this pipeline stage. | |
919 | */ | |
920 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || | |
921 | zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) | |
922 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 923 | |
b128c09f BB |
924 | if (!IO_IS_ALLOCATING(zio)) |
925 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f | 926 | |
428870ff BB |
927 | ASSERT(zio->io_child_type != ZIO_CHILD_DDT); |
928 | ||
929 | if (zio->io_bp_override) { | |
930 | ASSERT(bp->blk_birth != zio->io_txg); | |
931 | ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); | |
932 | ||
933 | *bp = *zio->io_bp_override; | |
934 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
935 | ||
936 | if (BP_IS_HOLE(bp) || !zp->zp_dedup) | |
937 | return (ZIO_PIPELINE_CONTINUE); | |
938 | ||
939 | ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup || | |
940 | zp->zp_dedup_verify); | |
941 | ||
942 | if (BP_GET_CHECKSUM(bp) == zp->zp_checksum) { | |
943 | BP_SET_DEDUP(bp, 1); | |
944 | zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; | |
945 | return (ZIO_PIPELINE_CONTINUE); | |
946 | } | |
947 | zio->io_bp_override = NULL; | |
948 | BP_ZERO(bp); | |
949 | } | |
34dc7c2f | 950 | |
b128c09f BB |
951 | if (bp->blk_birth == zio->io_txg) { |
952 | /* | |
953 | * We're rewriting an existing block, which means we're | |
954 | * working on behalf of spa_sync(). For spa_sync() to | |
955 | * converge, it must eventually be the case that we don't | |
956 | * have to allocate new blocks. But compression changes | |
957 | * the blocksize, which forces a reallocate, and makes | |
958 | * convergence take longer. Therefore, after the first | |
959 | * few passes, stop compressing to ensure convergence. | |
960 | */ | |
428870ff BB |
961 | pass = spa_sync_pass(spa); |
962 | ||
963 | ASSERT(zio->io_txg == spa_syncing_txg(spa)); | |
964 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
965 | ASSERT(!BP_GET_DEDUP(bp)); | |
34dc7c2f | 966 | |
b128c09f BB |
967 | if (pass > SYNC_PASS_DONT_COMPRESS) |
968 | compress = ZIO_COMPRESS_OFF; | |
34dc7c2f | 969 | |
b128c09f | 970 | /* Make sure someone doesn't change their mind on overwrites */ |
428870ff BB |
971 | ASSERT(MIN(zp->zp_copies + BP_IS_GANG(bp), |
972 | spa_max_replication(spa)) == BP_GET_NDVAS(bp)); | |
b128c09f | 973 | } |
34dc7c2f | 974 | |
b128c09f | 975 | if (compress != ZIO_COMPRESS_OFF) { |
428870ff BB |
976 | void *cbuf = zio_buf_alloc(lsize); |
977 | psize = zio_compress_data(compress, zio->io_data, cbuf, lsize); | |
978 | if (psize == 0 || psize == lsize) { | |
b128c09f | 979 | compress = ZIO_COMPRESS_OFF; |
428870ff BB |
980 | zio_buf_free(cbuf, lsize); |
981 | } else { | |
982 | ASSERT(psize < lsize); | |
983 | zio_push_transform(zio, cbuf, psize, lsize, NULL); | |
b128c09f BB |
984 | } |
985 | } | |
34dc7c2f | 986 | |
b128c09f BB |
987 | /* |
988 | * The final pass of spa_sync() must be all rewrites, but the first | |
989 | * few passes offer a trade-off: allocating blocks defers convergence, | |
990 | * but newly allocated blocks are sequential, so they can be written | |
991 | * to disk faster. Therefore, we allow the first few passes of | |
992 | * spa_sync() to allocate new blocks, but force rewrites after that. | |
993 | * There should only be a handful of blocks after pass 1 in any case. | |
994 | */ | |
428870ff | 995 | if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == psize && |
b128c09f | 996 | pass > SYNC_PASS_REWRITE) { |
428870ff | 997 | enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; |
d6320ddb | 998 | ASSERT(psize != 0); |
b128c09f BB |
999 | zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; |
1000 | zio->io_flags |= ZIO_FLAG_IO_REWRITE; | |
1001 | } else { | |
1002 | BP_ZERO(bp); | |
1003 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
1004 | } | |
34dc7c2f | 1005 | |
428870ff | 1006 | if (psize == 0) { |
b128c09f BB |
1007 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
1008 | } else { | |
1009 | ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); | |
1010 | BP_SET_LSIZE(bp, lsize); | |
428870ff | 1011 | BP_SET_PSIZE(bp, psize); |
b128c09f BB |
1012 | BP_SET_COMPRESS(bp, compress); |
1013 | BP_SET_CHECKSUM(bp, zp->zp_checksum); | |
1014 | BP_SET_TYPE(bp, zp->zp_type); | |
1015 | BP_SET_LEVEL(bp, zp->zp_level); | |
428870ff | 1016 | BP_SET_DEDUP(bp, zp->zp_dedup); |
b128c09f | 1017 | BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); |
428870ff BB |
1018 | if (zp->zp_dedup) { |
1019 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1020 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); | |
1021 | zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | return (ZIO_PIPELINE_CONTINUE); | |
1026 | } | |
1027 | ||
1028 | static int | |
1029 | zio_free_bp_init(zio_t *zio) | |
1030 | { | |
1031 | blkptr_t *bp = zio->io_bp; | |
1032 | ||
1033 | if (zio->io_child_type == ZIO_CHILD_LOGICAL) { | |
1034 | if (BP_GET_DEDUP(bp)) | |
1035 | zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; | |
b128c09f | 1036 | } |
34dc7c2f BB |
1037 | |
1038 | return (ZIO_PIPELINE_CONTINUE); | |
1039 | } | |
1040 | ||
b128c09f BB |
1041 | /* |
1042 | * ========================================================================== | |
1043 | * Execute the I/O pipeline | |
1044 | * ========================================================================== | |
1045 | */ | |
1046 | ||
1047 | static void | |
428870ff | 1048 | zio_taskq_dispatch(zio_t *zio, enum zio_taskq_type q, boolean_t cutinline) |
34dc7c2f | 1049 | { |
428870ff | 1050 | spa_t *spa = zio->io_spa; |
b128c09f | 1051 | zio_type_t t = zio->io_type; |
428870ff | 1052 | int flags = TQ_SLEEP | (cutinline ? TQ_FRONT : 0); |
34dc7c2f BB |
1053 | |
1054 | /* | |
9babb374 BB |
1055 | * If we're a config writer or a probe, the normal issue and |
1056 | * interrupt threads may all be blocked waiting for the config lock. | |
1057 | * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. | |
34dc7c2f | 1058 | */ |
9babb374 | 1059 | if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) |
b128c09f | 1060 | t = ZIO_TYPE_NULL; |
34dc7c2f BB |
1061 | |
1062 | /* | |
b128c09f | 1063 | * A similar issue exists for the L2ARC write thread until L2ARC 2.0. |
34dc7c2f | 1064 | */ |
b128c09f BB |
1065 | if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) |
1066 | t = ZIO_TYPE_NULL; | |
34dc7c2f | 1067 | |
428870ff BB |
1068 | /* |
1069 | * If this is a high priority I/O, then use the high priority taskq. | |
1070 | */ | |
1071 | if (zio->io_priority == ZIO_PRIORITY_NOW && | |
1072 | spa->spa_zio_taskq[t][q + 1] != NULL) | |
1073 | q++; | |
1074 | ||
1075 | ASSERT3U(q, <, ZIO_TASKQ_TYPES); | |
1076 | (void) taskq_dispatch(spa->spa_zio_taskq[t][q], | |
1077 | (task_func_t *)zio_execute, zio, flags); | |
b128c09f | 1078 | } |
34dc7c2f | 1079 | |
b128c09f BB |
1080 | static boolean_t |
1081 | zio_taskq_member(zio_t *zio, enum zio_taskq_type q) | |
1082 | { | |
1083 | kthread_t *executor = zio->io_executor; | |
1084 | spa_t *spa = zio->io_spa; | |
d6320ddb | 1085 | zio_type_t t; |
34dc7c2f | 1086 | |
d6320ddb | 1087 | for (t = 0; t < ZIO_TYPES; t++) |
b128c09f BB |
1088 | if (taskq_member(spa->spa_zio_taskq[t][q], executor)) |
1089 | return (B_TRUE); | |
34dc7c2f | 1090 | |
b128c09f BB |
1091 | return (B_FALSE); |
1092 | } | |
34dc7c2f | 1093 | |
b128c09f BB |
1094 | static int |
1095 | zio_issue_async(zio_t *zio) | |
1096 | { | |
428870ff | 1097 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); |
b128c09f BB |
1098 | |
1099 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
1100 | } |
1101 | ||
b128c09f BB |
1102 | void |
1103 | zio_interrupt(zio_t *zio) | |
34dc7c2f | 1104 | { |
428870ff | 1105 | zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE); |
b128c09f | 1106 | } |
34dc7c2f | 1107 | |
b128c09f BB |
1108 | /* |
1109 | * Execute the I/O pipeline until one of the following occurs: | |
1110 | * (1) the I/O completes; (2) the pipeline stalls waiting for | |
1111 | * dependent child I/Os; (3) the I/O issues, so we're waiting | |
1112 | * for an I/O completion interrupt; (4) the I/O is delegated by | |
1113 | * vdev-level caching or aggregation; (5) the I/O is deferred | |
1114 | * due to vdev-level queueing; (6) the I/O is handed off to | |
1115 | * another thread. In all cases, the pipeline stops whenever | |
1116 | * there's no CPU work; it never burns a thread in cv_wait(). | |
1117 | * | |
1118 | * There's no locking on io_stage because there's no legitimate way | |
1119 | * for multiple threads to be attempting to process the same I/O. | |
1120 | */ | |
428870ff | 1121 | static zio_pipe_stage_t *zio_pipeline[]; |
34dc7c2f | 1122 | |
b128c09f BB |
1123 | void |
1124 | zio_execute(zio_t *zio) | |
1125 | { | |
1126 | zio->io_executor = curthread; | |
34dc7c2f | 1127 | |
b128c09f | 1128 | while (zio->io_stage < ZIO_STAGE_DONE) { |
428870ff BB |
1129 | enum zio_stage pipeline = zio->io_pipeline; |
1130 | enum zio_stage stage = zio->io_stage; | |
b128c09f | 1131 | int rv; |
34dc7c2f | 1132 | |
b128c09f | 1133 | ASSERT(!MUTEX_HELD(&zio->io_lock)); |
428870ff BB |
1134 | ASSERT(ISP2(stage)); |
1135 | ASSERT(zio->io_stall == NULL); | |
34dc7c2f | 1136 | |
428870ff BB |
1137 | do { |
1138 | stage <<= 1; | |
1139 | } while ((stage & pipeline) == 0); | |
b128c09f BB |
1140 | |
1141 | ASSERT(stage <= ZIO_STAGE_DONE); | |
34dc7c2f BB |
1142 | |
1143 | /* | |
b128c09f BB |
1144 | * If we are in interrupt context and this pipeline stage |
1145 | * will grab a config lock that is held across I/O, | |
428870ff BB |
1146 | * or may wait for an I/O that needs an interrupt thread |
1147 | * to complete, issue async to avoid deadlock. | |
1148 | * | |
1149 | * For VDEV_IO_START, we cut in line so that the io will | |
1150 | * be sent to disk promptly. | |
34dc7c2f | 1151 | */ |
428870ff | 1152 | if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && |
b128c09f | 1153 | zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { |
428870ff BB |
1154 | boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ? |
1155 | zio_requeue_io_start_cut_in_line : B_FALSE; | |
1156 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); | |
b128c09f | 1157 | return; |
34dc7c2f BB |
1158 | } |
1159 | ||
b128c09f | 1160 | zio->io_stage = stage; |
428870ff | 1161 | rv = zio_pipeline[highbit(stage) - 1](zio); |
34dc7c2f | 1162 | |
b128c09f BB |
1163 | if (rv == ZIO_PIPELINE_STOP) |
1164 | return; | |
34dc7c2f | 1165 | |
b128c09f BB |
1166 | ASSERT(rv == ZIO_PIPELINE_CONTINUE); |
1167 | } | |
34dc7c2f BB |
1168 | } |
1169 | ||
b128c09f BB |
1170 | /* |
1171 | * ========================================================================== | |
1172 | * Initiate I/O, either sync or async | |
1173 | * ========================================================================== | |
1174 | */ | |
1175 | int | |
1176 | zio_wait(zio_t *zio) | |
34dc7c2f | 1177 | { |
b128c09f | 1178 | int error; |
34dc7c2f | 1179 | |
b128c09f BB |
1180 | ASSERT(zio->io_stage == ZIO_STAGE_OPEN); |
1181 | ASSERT(zio->io_executor == NULL); | |
34dc7c2f | 1182 | |
b128c09f | 1183 | zio->io_waiter = curthread; |
34dc7c2f | 1184 | |
b128c09f | 1185 | zio_execute(zio); |
34dc7c2f | 1186 | |
b128c09f BB |
1187 | mutex_enter(&zio->io_lock); |
1188 | while (zio->io_executor != NULL) | |
1189 | cv_wait(&zio->io_cv, &zio->io_lock); | |
1190 | mutex_exit(&zio->io_lock); | |
34dc7c2f | 1191 | |
b128c09f BB |
1192 | error = zio->io_error; |
1193 | zio_destroy(zio); | |
34dc7c2f | 1194 | |
b128c09f BB |
1195 | return (error); |
1196 | } | |
34dc7c2f | 1197 | |
b128c09f BB |
1198 | void |
1199 | zio_nowait(zio_t *zio) | |
1200 | { | |
1201 | ASSERT(zio->io_executor == NULL); | |
34dc7c2f | 1202 | |
d164b209 BB |
1203 | if (zio->io_child_type == ZIO_CHILD_LOGICAL && |
1204 | zio_unique_parent(zio) == NULL) { | |
34dc7c2f | 1205 | /* |
b128c09f | 1206 | * This is a logical async I/O with no parent to wait for it. |
9babb374 BB |
1207 | * We add it to the spa_async_root_zio "Godfather" I/O which |
1208 | * will ensure they complete prior to unloading the pool. | |
34dc7c2f | 1209 | */ |
b128c09f | 1210 | spa_t *spa = zio->io_spa; |
9babb374 BB |
1211 | |
1212 | zio_add_child(spa->spa_async_zio_root, zio); | |
b128c09f | 1213 | } |
34dc7c2f | 1214 | |
b128c09f BB |
1215 | zio_execute(zio); |
1216 | } | |
34dc7c2f | 1217 | |
b128c09f BB |
1218 | /* |
1219 | * ========================================================================== | |
1220 | * Reexecute or suspend/resume failed I/O | |
1221 | * ========================================================================== | |
1222 | */ | |
34dc7c2f | 1223 | |
b128c09f BB |
1224 | static void |
1225 | zio_reexecute(zio_t *pio) | |
1226 | { | |
d164b209 | 1227 | zio_t *cio, *cio_next; |
d6320ddb | 1228 | int c, w; |
d164b209 BB |
1229 | |
1230 | ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); | |
1231 | ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); | |
9babb374 BB |
1232 | ASSERT(pio->io_gang_leader == NULL); |
1233 | ASSERT(pio->io_gang_tree == NULL); | |
34dc7c2f | 1234 | |
b128c09f BB |
1235 | pio->io_flags = pio->io_orig_flags; |
1236 | pio->io_stage = pio->io_orig_stage; | |
1237 | pio->io_pipeline = pio->io_orig_pipeline; | |
1238 | pio->io_reexecute = 0; | |
1239 | pio->io_error = 0; | |
d6320ddb | 1240 | for (w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 | 1241 | pio->io_state[w] = 0; |
d6320ddb | 1242 | for (c = 0; c < ZIO_CHILD_TYPES; c++) |
b128c09f | 1243 | pio->io_child_error[c] = 0; |
34dc7c2f | 1244 | |
428870ff BB |
1245 | if (IO_IS_ALLOCATING(pio)) |
1246 | BP_ZERO(pio->io_bp); | |
34dc7c2f | 1247 | |
b128c09f BB |
1248 | /* |
1249 | * As we reexecute pio's children, new children could be created. | |
d164b209 | 1250 | * New children go to the head of pio's io_child_list, however, |
b128c09f | 1251 | * so we will (correctly) not reexecute them. The key is that |
d164b209 BB |
1252 | * the remainder of pio's io_child_list, from 'cio_next' onward, |
1253 | * cannot be affected by any side effects of reexecuting 'cio'. | |
b128c09f | 1254 | */ |
d164b209 BB |
1255 | for (cio = zio_walk_children(pio); cio != NULL; cio = cio_next) { |
1256 | cio_next = zio_walk_children(pio); | |
b128c09f | 1257 | mutex_enter(&pio->io_lock); |
d6320ddb | 1258 | for (w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 | 1259 | pio->io_children[cio->io_child_type][w]++; |
b128c09f | 1260 | mutex_exit(&pio->io_lock); |
d164b209 | 1261 | zio_reexecute(cio); |
34dc7c2f | 1262 | } |
34dc7c2f | 1263 | |
b128c09f BB |
1264 | /* |
1265 | * Now that all children have been reexecuted, execute the parent. | |
9babb374 BB |
1266 | * We don't reexecute "The Godfather" I/O here as it's the |
1267 | * responsibility of the caller to wait on him. | |
b128c09f | 1268 | */ |
9babb374 BB |
1269 | if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) |
1270 | zio_execute(pio); | |
34dc7c2f BB |
1271 | } |
1272 | ||
b128c09f BB |
1273 | void |
1274 | zio_suspend(spa_t *spa, zio_t *zio) | |
34dc7c2f | 1275 | { |
b128c09f BB |
1276 | if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) |
1277 | fm_panic("Pool '%s' has encountered an uncorrectable I/O " | |
1278 | "failure and the failure mode property for this pool " | |
1279 | "is set to panic.", spa_name(spa)); | |
34dc7c2f | 1280 | |
b128c09f | 1281 | zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); |
34dc7c2f | 1282 | |
b128c09f | 1283 | mutex_enter(&spa->spa_suspend_lock); |
34dc7c2f | 1284 | |
b128c09f | 1285 | if (spa->spa_suspend_zio_root == NULL) |
9babb374 BB |
1286 | spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, |
1287 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | | |
1288 | ZIO_FLAG_GODFATHER); | |
34dc7c2f | 1289 | |
b128c09f | 1290 | spa->spa_suspended = B_TRUE; |
34dc7c2f | 1291 | |
b128c09f | 1292 | if (zio != NULL) { |
9babb374 | 1293 | ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); |
b128c09f BB |
1294 | ASSERT(zio != spa->spa_suspend_zio_root); |
1295 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
d164b209 | 1296 | ASSERT(zio_unique_parent(zio) == NULL); |
b128c09f BB |
1297 | ASSERT(zio->io_stage == ZIO_STAGE_DONE); |
1298 | zio_add_child(spa->spa_suspend_zio_root, zio); | |
1299 | } | |
34dc7c2f | 1300 | |
b128c09f BB |
1301 | mutex_exit(&spa->spa_suspend_lock); |
1302 | } | |
34dc7c2f | 1303 | |
9babb374 | 1304 | int |
b128c09f BB |
1305 | zio_resume(spa_t *spa) |
1306 | { | |
9babb374 | 1307 | zio_t *pio; |
34dc7c2f BB |
1308 | |
1309 | /* | |
b128c09f | 1310 | * Reexecute all previously suspended i/o. |
34dc7c2f | 1311 | */ |
b128c09f BB |
1312 | mutex_enter(&spa->spa_suspend_lock); |
1313 | spa->spa_suspended = B_FALSE; | |
1314 | cv_broadcast(&spa->spa_suspend_cv); | |
1315 | pio = spa->spa_suspend_zio_root; | |
1316 | spa->spa_suspend_zio_root = NULL; | |
1317 | mutex_exit(&spa->spa_suspend_lock); | |
1318 | ||
1319 | if (pio == NULL) | |
9babb374 | 1320 | return (0); |
34dc7c2f | 1321 | |
9babb374 BB |
1322 | zio_reexecute(pio); |
1323 | return (zio_wait(pio)); | |
b128c09f BB |
1324 | } |
1325 | ||
1326 | void | |
1327 | zio_resume_wait(spa_t *spa) | |
1328 | { | |
1329 | mutex_enter(&spa->spa_suspend_lock); | |
1330 | while (spa_suspended(spa)) | |
1331 | cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); | |
1332 | mutex_exit(&spa->spa_suspend_lock); | |
34dc7c2f BB |
1333 | } |
1334 | ||
1335 | /* | |
1336 | * ========================================================================== | |
b128c09f BB |
1337 | * Gang blocks. |
1338 | * | |
1339 | * A gang block is a collection of small blocks that looks to the DMU | |
1340 | * like one large block. When zio_dva_allocate() cannot find a block | |
1341 | * of the requested size, due to either severe fragmentation or the pool | |
1342 | * being nearly full, it calls zio_write_gang_block() to construct the | |
1343 | * block from smaller fragments. | |
1344 | * | |
1345 | * A gang block consists of a gang header (zio_gbh_phys_t) and up to | |
1346 | * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like | |
1347 | * an indirect block: it's an array of block pointers. It consumes | |
1348 | * only one sector and hence is allocatable regardless of fragmentation. | |
1349 | * The gang header's bps point to its gang members, which hold the data. | |
1350 | * | |
1351 | * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> | |
1352 | * as the verifier to ensure uniqueness of the SHA256 checksum. | |
1353 | * Critically, the gang block bp's blk_cksum is the checksum of the data, | |
1354 | * not the gang header. This ensures that data block signatures (needed for | |
1355 | * deduplication) are independent of how the block is physically stored. | |
1356 | * | |
1357 | * Gang blocks can be nested: a gang member may itself be a gang block. | |
1358 | * Thus every gang block is a tree in which root and all interior nodes are | |
1359 | * gang headers, and the leaves are normal blocks that contain user data. | |
1360 | * The root of the gang tree is called the gang leader. | |
1361 | * | |
1362 | * To perform any operation (read, rewrite, free, claim) on a gang block, | |
1363 | * zio_gang_assemble() first assembles the gang tree (minus data leaves) | |
1364 | * in the io_gang_tree field of the original logical i/o by recursively | |
1365 | * reading the gang leader and all gang headers below it. This yields | |
1366 | * an in-core tree containing the contents of every gang header and the | |
1367 | * bps for every constituent of the gang block. | |
1368 | * | |
1369 | * With the gang tree now assembled, zio_gang_issue() just walks the gang tree | |
1370 | * and invokes a callback on each bp. To free a gang block, zio_gang_issue() | |
1371 | * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. | |
1372 | * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). | |
1373 | * zio_read_gang() is a wrapper around zio_read() that omits reading gang | |
1374 | * headers, since we already have those in io_gang_tree. zio_rewrite_gang() | |
1375 | * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() | |
1376 | * of the gang header plus zio_checksum_compute() of the data to update the | |
1377 | * gang header's blk_cksum as described above. | |
1378 | * | |
1379 | * The two-phase assemble/issue model solves the problem of partial failure -- | |
1380 | * what if you'd freed part of a gang block but then couldn't read the | |
1381 | * gang header for another part? Assembling the entire gang tree first | |
1382 | * ensures that all the necessary gang header I/O has succeeded before | |
1383 | * starting the actual work of free, claim, or write. Once the gang tree | |
1384 | * is assembled, free and claim are in-memory operations that cannot fail. | |
1385 | * | |
1386 | * In the event that a gang write fails, zio_dva_unallocate() walks the | |
1387 | * gang tree to immediately free (i.e. insert back into the space map) | |
1388 | * everything we've allocated. This ensures that we don't get ENOSPC | |
1389 | * errors during repeated suspend/resume cycles due to a flaky device. | |
1390 | * | |
1391 | * Gang rewrites only happen during sync-to-convergence. If we can't assemble | |
1392 | * the gang tree, we won't modify the block, so we can safely defer the free | |
1393 | * (knowing that the block is still intact). If we *can* assemble the gang | |
1394 | * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free | |
1395 | * each constituent bp and we can allocate a new block on the next sync pass. | |
1396 | * | |
1397 | * In all cases, the gang tree allows complete recovery from partial failure. | |
34dc7c2f BB |
1398 | * ========================================================================== |
1399 | */ | |
b128c09f BB |
1400 | |
1401 | static zio_t * | |
1402 | zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
34dc7c2f | 1403 | { |
b128c09f BB |
1404 | if (gn != NULL) |
1405 | return (pio); | |
34dc7c2f | 1406 | |
b128c09f BB |
1407 | return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), |
1408 | NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), | |
1409 | &pio->io_bookmark)); | |
1410 | } | |
1411 | ||
1412 | zio_t * | |
1413 | zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
1414 | { | |
1415 | zio_t *zio; | |
1416 | ||
1417 | if (gn != NULL) { | |
1418 | zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, | |
1419 | gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, | |
1420 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f | 1421 | /* |
b128c09f BB |
1422 | * As we rewrite each gang header, the pipeline will compute |
1423 | * a new gang block header checksum for it; but no one will | |
1424 | * compute a new data checksum, so we do that here. The one | |
1425 | * exception is the gang leader: the pipeline already computed | |
1426 | * its data checksum because that stage precedes gang assembly. | |
1427 | * (Presently, nothing actually uses interior data checksums; | |
1428 | * this is just good hygiene.) | |
34dc7c2f | 1429 | */ |
9babb374 | 1430 | if (gn != pio->io_gang_leader->io_gang_tree) { |
b128c09f BB |
1431 | zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), |
1432 | data, BP_GET_PSIZE(bp)); | |
1433 | } | |
428870ff BB |
1434 | /* |
1435 | * If we are here to damage data for testing purposes, | |
1436 | * leave the GBH alone so that we can detect the damage. | |
1437 | */ | |
1438 | if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) | |
1439 | zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; | |
34dc7c2f | 1440 | } else { |
b128c09f BB |
1441 | zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, |
1442 | data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, | |
1443 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f BB |
1444 | } |
1445 | ||
b128c09f BB |
1446 | return (zio); |
1447 | } | |
34dc7c2f | 1448 | |
b128c09f BB |
1449 | /* ARGSUSED */ |
1450 | zio_t * | |
1451 | zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
1452 | { | |
428870ff BB |
1453 | return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, |
1454 | ZIO_GANG_CHILD_FLAGS(pio))); | |
34dc7c2f BB |
1455 | } |
1456 | ||
b128c09f BB |
1457 | /* ARGSUSED */ |
1458 | zio_t * | |
1459 | zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
34dc7c2f | 1460 | { |
b128c09f BB |
1461 | return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, |
1462 | NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); | |
1463 | } | |
1464 | ||
1465 | static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { | |
1466 | NULL, | |
1467 | zio_read_gang, | |
1468 | zio_rewrite_gang, | |
1469 | zio_free_gang, | |
1470 | zio_claim_gang, | |
1471 | NULL | |
1472 | }; | |
34dc7c2f | 1473 | |
b128c09f | 1474 | static void zio_gang_tree_assemble_done(zio_t *zio); |
34dc7c2f | 1475 | |
b128c09f BB |
1476 | static zio_gang_node_t * |
1477 | zio_gang_node_alloc(zio_gang_node_t **gnpp) | |
1478 | { | |
1479 | zio_gang_node_t *gn; | |
34dc7c2f | 1480 | |
b128c09f | 1481 | ASSERT(*gnpp == NULL); |
34dc7c2f | 1482 | |
b128c09f BB |
1483 | gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); |
1484 | gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); | |
1485 | *gnpp = gn; | |
34dc7c2f | 1486 | |
b128c09f | 1487 | return (gn); |
34dc7c2f BB |
1488 | } |
1489 | ||
34dc7c2f | 1490 | static void |
b128c09f | 1491 | zio_gang_node_free(zio_gang_node_t **gnpp) |
34dc7c2f | 1492 | { |
b128c09f | 1493 | zio_gang_node_t *gn = *gnpp; |
d6320ddb | 1494 | int g; |
34dc7c2f | 1495 | |
d6320ddb | 1496 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) |
b128c09f BB |
1497 | ASSERT(gn->gn_child[g] == NULL); |
1498 | ||
1499 | zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); | |
1500 | kmem_free(gn, sizeof (*gn)); | |
1501 | *gnpp = NULL; | |
34dc7c2f BB |
1502 | } |
1503 | ||
b128c09f BB |
1504 | static void |
1505 | zio_gang_tree_free(zio_gang_node_t **gnpp) | |
34dc7c2f | 1506 | { |
b128c09f | 1507 | zio_gang_node_t *gn = *gnpp; |
d6320ddb | 1508 | int g; |
34dc7c2f | 1509 | |
b128c09f BB |
1510 | if (gn == NULL) |
1511 | return; | |
34dc7c2f | 1512 | |
d6320ddb | 1513 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) |
b128c09f | 1514 | zio_gang_tree_free(&gn->gn_child[g]); |
34dc7c2f | 1515 | |
b128c09f | 1516 | zio_gang_node_free(gnpp); |
34dc7c2f BB |
1517 | } |
1518 | ||
b128c09f | 1519 | static void |
9babb374 | 1520 | zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) |
34dc7c2f | 1521 | { |
b128c09f BB |
1522 | zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); |
1523 | ||
9babb374 | 1524 | ASSERT(gio->io_gang_leader == gio); |
b128c09f | 1525 | ASSERT(BP_IS_GANG(bp)); |
34dc7c2f | 1526 | |
9babb374 | 1527 | zio_nowait(zio_read(gio, gio->io_spa, bp, gn->gn_gbh, |
b128c09f | 1528 | SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, |
9babb374 | 1529 | gio->io_priority, ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); |
b128c09f | 1530 | } |
34dc7c2f | 1531 | |
b128c09f BB |
1532 | static void |
1533 | zio_gang_tree_assemble_done(zio_t *zio) | |
1534 | { | |
9babb374 | 1535 | zio_t *gio = zio->io_gang_leader; |
b128c09f BB |
1536 | zio_gang_node_t *gn = zio->io_private; |
1537 | blkptr_t *bp = zio->io_bp; | |
d6320ddb | 1538 | int g; |
34dc7c2f | 1539 | |
9babb374 | 1540 | ASSERT(gio == zio_unique_parent(zio)); |
428870ff | 1541 | ASSERT(zio->io_child_count == 0); |
34dc7c2f | 1542 | |
b128c09f BB |
1543 | if (zio->io_error) |
1544 | return; | |
34dc7c2f | 1545 | |
b128c09f BB |
1546 | if (BP_SHOULD_BYTESWAP(bp)) |
1547 | byteswap_uint64_array(zio->io_data, zio->io_size); | |
34dc7c2f | 1548 | |
b128c09f BB |
1549 | ASSERT(zio->io_data == gn->gn_gbh); |
1550 | ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); | |
428870ff | 1551 | ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); |
34dc7c2f | 1552 | |
d6320ddb | 1553 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
1554 | blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; |
1555 | if (!BP_IS_GANG(gbp)) | |
1556 | continue; | |
9babb374 | 1557 | zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); |
b128c09f | 1558 | } |
34dc7c2f BB |
1559 | } |
1560 | ||
b128c09f BB |
1561 | static void |
1562 | zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) | |
34dc7c2f | 1563 | { |
9babb374 | 1564 | zio_t *gio = pio->io_gang_leader; |
b128c09f | 1565 | zio_t *zio; |
d6320ddb | 1566 | int g; |
34dc7c2f | 1567 | |
b128c09f | 1568 | ASSERT(BP_IS_GANG(bp) == !!gn); |
9babb374 BB |
1569 | ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); |
1570 | ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); | |
34dc7c2f | 1571 | |
b128c09f BB |
1572 | /* |
1573 | * If you're a gang header, your data is in gn->gn_gbh. | |
1574 | * If you're a gang member, your data is in 'data' and gn == NULL. | |
1575 | */ | |
9babb374 | 1576 | zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data); |
34dc7c2f | 1577 | |
b128c09f | 1578 | if (gn != NULL) { |
428870ff | 1579 | ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); |
34dc7c2f | 1580 | |
d6320ddb | 1581 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
1582 | blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; |
1583 | if (BP_IS_HOLE(gbp)) | |
1584 | continue; | |
1585 | zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); | |
1586 | data = (char *)data + BP_GET_PSIZE(gbp); | |
1587 | } | |
34dc7c2f BB |
1588 | } |
1589 | ||
9babb374 BB |
1590 | if (gn == gio->io_gang_tree) |
1591 | ASSERT3P((char *)gio->io_data + gio->io_size, ==, data); | |
34dc7c2f | 1592 | |
b128c09f BB |
1593 | if (zio != pio) |
1594 | zio_nowait(zio); | |
34dc7c2f BB |
1595 | } |
1596 | ||
1597 | static int | |
b128c09f | 1598 | zio_gang_assemble(zio_t *zio) |
34dc7c2f | 1599 | { |
b128c09f | 1600 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 1601 | |
9babb374 BB |
1602 | ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); |
1603 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
1604 | ||
1605 | zio->io_gang_leader = zio; | |
34dc7c2f | 1606 | |
b128c09f | 1607 | zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); |
34dc7c2f BB |
1608 | |
1609 | return (ZIO_PIPELINE_CONTINUE); | |
1610 | } | |
1611 | ||
1612 | static int | |
b128c09f | 1613 | zio_gang_issue(zio_t *zio) |
34dc7c2f | 1614 | { |
b128c09f | 1615 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 1616 | |
b128c09f BB |
1617 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) |
1618 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 1619 | |
9babb374 BB |
1620 | ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); |
1621 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
34dc7c2f | 1622 | |
b128c09f | 1623 | if (zio->io_child_error[ZIO_CHILD_GANG] == 0) |
9babb374 | 1624 | zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_data); |
b128c09f | 1625 | else |
9babb374 | 1626 | zio_gang_tree_free(&zio->io_gang_tree); |
34dc7c2f | 1627 | |
b128c09f | 1628 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
34dc7c2f BB |
1629 | |
1630 | return (ZIO_PIPELINE_CONTINUE); | |
1631 | } | |
1632 | ||
1633 | static void | |
b128c09f | 1634 | zio_write_gang_member_ready(zio_t *zio) |
34dc7c2f | 1635 | { |
d164b209 | 1636 | zio_t *pio = zio_unique_parent(zio); |
1fde1e37 | 1637 | ASSERTV(zio_t *gio = zio->io_gang_leader;) |
34dc7c2f BB |
1638 | dva_t *cdva = zio->io_bp->blk_dva; |
1639 | dva_t *pdva = pio->io_bp->blk_dva; | |
1640 | uint64_t asize; | |
d6320ddb | 1641 | int d; |
34dc7c2f | 1642 | |
b128c09f BB |
1643 | if (BP_IS_HOLE(zio->io_bp)) |
1644 | return; | |
1645 | ||
1646 | ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); | |
1647 | ||
1648 | ASSERT(zio->io_child_type == ZIO_CHILD_GANG); | |
428870ff BB |
1649 | ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); |
1650 | ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); | |
1651 | ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); | |
34dc7c2f | 1652 | ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); |
34dc7c2f BB |
1653 | |
1654 | mutex_enter(&pio->io_lock); | |
d6320ddb | 1655 | for (d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { |
34dc7c2f BB |
1656 | ASSERT(DVA_GET_GANG(&pdva[d])); |
1657 | asize = DVA_GET_ASIZE(&pdva[d]); | |
1658 | asize += DVA_GET_ASIZE(&cdva[d]); | |
1659 | DVA_SET_ASIZE(&pdva[d], asize); | |
1660 | } | |
1661 | mutex_exit(&pio->io_lock); | |
1662 | } | |
1663 | ||
1664 | static int | |
b128c09f | 1665 | zio_write_gang_block(zio_t *pio) |
34dc7c2f | 1666 | { |
b128c09f BB |
1667 | spa_t *spa = pio->io_spa; |
1668 | blkptr_t *bp = pio->io_bp; | |
9babb374 | 1669 | zio_t *gio = pio->io_gang_leader; |
b128c09f BB |
1670 | zio_t *zio; |
1671 | zio_gang_node_t *gn, **gnpp; | |
34dc7c2f | 1672 | zio_gbh_phys_t *gbh; |
b128c09f BB |
1673 | uint64_t txg = pio->io_txg; |
1674 | uint64_t resid = pio->io_size; | |
1675 | uint64_t lsize; | |
428870ff BB |
1676 | int copies = gio->io_prop.zp_copies; |
1677 | int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); | |
b128c09f | 1678 | zio_prop_t zp; |
d6320ddb | 1679 | int g, error; |
34dc7c2f | 1680 | |
428870ff BB |
1681 | error = metaslab_alloc(spa, spa_normal_class(spa), SPA_GANGBLOCKSIZE, |
1682 | bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, | |
b128c09f | 1683 | METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); |
34dc7c2f | 1684 | if (error) { |
b128c09f | 1685 | pio->io_error = error; |
34dc7c2f BB |
1686 | return (ZIO_PIPELINE_CONTINUE); |
1687 | } | |
1688 | ||
9babb374 BB |
1689 | if (pio == gio) { |
1690 | gnpp = &gio->io_gang_tree; | |
b128c09f BB |
1691 | } else { |
1692 | gnpp = pio->io_private; | |
1693 | ASSERT(pio->io_ready == zio_write_gang_member_ready); | |
34dc7c2f BB |
1694 | } |
1695 | ||
b128c09f BB |
1696 | gn = zio_gang_node_alloc(gnpp); |
1697 | gbh = gn->gn_gbh; | |
1698 | bzero(gbh, SPA_GANGBLOCKSIZE); | |
34dc7c2f | 1699 | |
b128c09f BB |
1700 | /* |
1701 | * Create the gang header. | |
1702 | */ | |
1703 | zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, | |
1704 | pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f | 1705 | |
b128c09f BB |
1706 | /* |
1707 | * Create and nowait the gang children. | |
1708 | */ | |
d6320ddb | 1709 | for (g = 0; resid != 0; resid -= lsize, g++) { |
b128c09f BB |
1710 | lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), |
1711 | SPA_MINBLOCKSIZE); | |
1712 | ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); | |
1713 | ||
9babb374 | 1714 | zp.zp_checksum = gio->io_prop.zp_checksum; |
b128c09f BB |
1715 | zp.zp_compress = ZIO_COMPRESS_OFF; |
1716 | zp.zp_type = DMU_OT_NONE; | |
1717 | zp.zp_level = 0; | |
428870ff BB |
1718 | zp.zp_copies = gio->io_prop.zp_copies; |
1719 | zp.zp_dedup = 0; | |
1720 | zp.zp_dedup_verify = 0; | |
b128c09f BB |
1721 | |
1722 | zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], | |
1723 | (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, | |
1724 | zio_write_gang_member_ready, NULL, &gn->gn_child[g], | |
1725 | pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), | |
1726 | &pio->io_bookmark)); | |
1727 | } | |
34dc7c2f BB |
1728 | |
1729 | /* | |
b128c09f | 1730 | * Set pio's pipeline to just wait for zio to finish. |
34dc7c2f | 1731 | */ |
b128c09f BB |
1732 | pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
1733 | ||
1734 | zio_nowait(zio); | |
1735 | ||
1736 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f BB |
1737 | } |
1738 | ||
1739 | /* | |
1740 | * ========================================================================== | |
428870ff | 1741 | * Dedup |
34dc7c2f BB |
1742 | * ========================================================================== |
1743 | */ | |
428870ff BB |
1744 | static void |
1745 | zio_ddt_child_read_done(zio_t *zio) | |
1746 | { | |
1747 | blkptr_t *bp = zio->io_bp; | |
1748 | ddt_entry_t *dde = zio->io_private; | |
1749 | ddt_phys_t *ddp; | |
1750 | zio_t *pio = zio_unique_parent(zio); | |
1751 | ||
1752 | mutex_enter(&pio->io_lock); | |
1753 | ddp = ddt_phys_select(dde, bp); | |
1754 | if (zio->io_error == 0) | |
1755 | ddt_phys_clear(ddp); /* this ddp doesn't need repair */ | |
1756 | if (zio->io_error == 0 && dde->dde_repair_data == NULL) | |
1757 | dde->dde_repair_data = zio->io_data; | |
1758 | else | |
1759 | zio_buf_free(zio->io_data, zio->io_size); | |
1760 | mutex_exit(&pio->io_lock); | |
1761 | } | |
1762 | ||
1763 | static int | |
1764 | zio_ddt_read_start(zio_t *zio) | |
1765 | { | |
1766 | blkptr_t *bp = zio->io_bp; | |
d6320ddb | 1767 | int p; |
428870ff BB |
1768 | |
1769 | ASSERT(BP_GET_DEDUP(bp)); | |
1770 | ASSERT(BP_GET_PSIZE(bp) == zio->io_size); | |
1771 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1772 | ||
1773 | if (zio->io_child_error[ZIO_CHILD_DDT]) { | |
1774 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
1775 | ddt_entry_t *dde = ddt_repair_start(ddt, bp); | |
1776 | ddt_phys_t *ddp = dde->dde_phys; | |
1777 | ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); | |
1778 | blkptr_t blk; | |
1779 | ||
1780 | ASSERT(zio->io_vsd == NULL); | |
1781 | zio->io_vsd = dde; | |
1782 | ||
1783 | if (ddp_self == NULL) | |
1784 | return (ZIO_PIPELINE_CONTINUE); | |
1785 | ||
d6320ddb | 1786 | for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff BB |
1787 | if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) |
1788 | continue; | |
1789 | ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, | |
1790 | &blk); | |
1791 | zio_nowait(zio_read(zio, zio->io_spa, &blk, | |
1792 | zio_buf_alloc(zio->io_size), zio->io_size, | |
1793 | zio_ddt_child_read_done, dde, zio->io_priority, | |
1794 | ZIO_DDT_CHILD_FLAGS(zio) | ZIO_FLAG_DONT_PROPAGATE, | |
1795 | &zio->io_bookmark)); | |
1796 | } | |
1797 | return (ZIO_PIPELINE_CONTINUE); | |
1798 | } | |
1799 | ||
1800 | zio_nowait(zio_read(zio, zio->io_spa, bp, | |
1801 | zio->io_data, zio->io_size, NULL, NULL, zio->io_priority, | |
1802 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); | |
1803 | ||
1804 | return (ZIO_PIPELINE_CONTINUE); | |
1805 | } | |
1806 | ||
1807 | static int | |
1808 | zio_ddt_read_done(zio_t *zio) | |
1809 | { | |
1810 | blkptr_t *bp = zio->io_bp; | |
1811 | ||
1812 | if (zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE)) | |
1813 | return (ZIO_PIPELINE_STOP); | |
1814 | ||
1815 | ASSERT(BP_GET_DEDUP(bp)); | |
1816 | ASSERT(BP_GET_PSIZE(bp) == zio->io_size); | |
1817 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1818 | ||
1819 | if (zio->io_child_error[ZIO_CHILD_DDT]) { | |
1820 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
1821 | ddt_entry_t *dde = zio->io_vsd; | |
1822 | if (ddt == NULL) { | |
1823 | ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE); | |
1824 | return (ZIO_PIPELINE_CONTINUE); | |
1825 | } | |
1826 | if (dde == NULL) { | |
1827 | zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; | |
1828 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); | |
1829 | return (ZIO_PIPELINE_STOP); | |
1830 | } | |
1831 | if (dde->dde_repair_data != NULL) { | |
1832 | bcopy(dde->dde_repair_data, zio->io_data, zio->io_size); | |
1833 | zio->io_child_error[ZIO_CHILD_DDT] = 0; | |
1834 | } | |
1835 | ddt_repair_done(ddt, dde); | |
1836 | zio->io_vsd = NULL; | |
1837 | } | |
1838 | ||
1839 | ASSERT(zio->io_vsd == NULL); | |
1840 | ||
1841 | return (ZIO_PIPELINE_CONTINUE); | |
1842 | } | |
1843 | ||
1844 | static boolean_t | |
1845 | zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) | |
1846 | { | |
1847 | spa_t *spa = zio->io_spa; | |
d6320ddb | 1848 | int p; |
428870ff BB |
1849 | |
1850 | /* | |
1851 | * Note: we compare the original data, not the transformed data, | |
1852 | * because when zio->io_bp is an override bp, we will not have | |
1853 | * pushed the I/O transforms. That's an important optimization | |
1854 | * because otherwise we'd compress/encrypt all dmu_sync() data twice. | |
1855 | */ | |
d6320ddb | 1856 | for (p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { |
428870ff BB |
1857 | zio_t *lio = dde->dde_lead_zio[p]; |
1858 | ||
1859 | if (lio != NULL) { | |
1860 | return (lio->io_orig_size != zio->io_orig_size || | |
1861 | bcmp(zio->io_orig_data, lio->io_orig_data, | |
1862 | zio->io_orig_size) != 0); | |
1863 | } | |
1864 | } | |
1865 | ||
d6320ddb | 1866 | for (p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { |
428870ff BB |
1867 | ddt_phys_t *ddp = &dde->dde_phys[p]; |
1868 | ||
1869 | if (ddp->ddp_phys_birth != 0) { | |
1870 | arc_buf_t *abuf = NULL; | |
1871 | uint32_t aflags = ARC_WAIT; | |
1872 | blkptr_t blk = *zio->io_bp; | |
1873 | int error; | |
1874 | ||
1875 | ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); | |
1876 | ||
1877 | ddt_exit(ddt); | |
1878 | ||
1879 | error = arc_read_nolock(NULL, spa, &blk, | |
1880 | arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, | |
1881 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, | |
1882 | &aflags, &zio->io_bookmark); | |
1883 | ||
1884 | if (error == 0) { | |
1885 | if (arc_buf_size(abuf) != zio->io_orig_size || | |
1886 | bcmp(abuf->b_data, zio->io_orig_data, | |
1887 | zio->io_orig_size) != 0) | |
1888 | error = EEXIST; | |
1889 | VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); | |
1890 | } | |
1891 | ||
1892 | ddt_enter(ddt); | |
1893 | return (error != 0); | |
1894 | } | |
1895 | } | |
1896 | ||
1897 | return (B_FALSE); | |
1898 | } | |
1899 | ||
1900 | static void | |
1901 | zio_ddt_child_write_ready(zio_t *zio) | |
1902 | { | |
1903 | int p = zio->io_prop.zp_copies; | |
1904 | ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); | |
1905 | ddt_entry_t *dde = zio->io_private; | |
1906 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
1907 | zio_t *pio; | |
1908 | ||
1909 | if (zio->io_error) | |
1910 | return; | |
1911 | ||
1912 | ddt_enter(ddt); | |
1913 | ||
1914 | ASSERT(dde->dde_lead_zio[p] == zio); | |
1915 | ||
1916 | ddt_phys_fill(ddp, zio->io_bp); | |
1917 | ||
1918 | while ((pio = zio_walk_parents(zio)) != NULL) | |
1919 | ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); | |
1920 | ||
1921 | ddt_exit(ddt); | |
1922 | } | |
1923 | ||
1924 | static void | |
1925 | zio_ddt_child_write_done(zio_t *zio) | |
1926 | { | |
1927 | int p = zio->io_prop.zp_copies; | |
1928 | ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); | |
1929 | ddt_entry_t *dde = zio->io_private; | |
1930 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
1931 | ||
1932 | ddt_enter(ddt); | |
1933 | ||
1934 | ASSERT(ddp->ddp_refcnt == 0); | |
1935 | ASSERT(dde->dde_lead_zio[p] == zio); | |
1936 | dde->dde_lead_zio[p] = NULL; | |
1937 | ||
1938 | if (zio->io_error == 0) { | |
1939 | while (zio_walk_parents(zio) != NULL) | |
1940 | ddt_phys_addref(ddp); | |
1941 | } else { | |
1942 | ddt_phys_clear(ddp); | |
1943 | } | |
1944 | ||
1945 | ddt_exit(ddt); | |
1946 | } | |
1947 | ||
1948 | static void | |
1949 | zio_ddt_ditto_write_done(zio_t *zio) | |
1950 | { | |
1951 | int p = DDT_PHYS_DITTO; | |
428870ff BB |
1952 | blkptr_t *bp = zio->io_bp; |
1953 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
1954 | ddt_entry_t *dde = zio->io_private; | |
1955 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
1956 | ddt_key_t *ddk = &dde->dde_key; | |
1fde1e37 | 1957 | ASSERTV(zio_prop_t *zp = &zio->io_prop); |
428870ff BB |
1958 | |
1959 | ddt_enter(ddt); | |
1960 | ||
1961 | ASSERT(ddp->ddp_refcnt == 0); | |
1962 | ASSERT(dde->dde_lead_zio[p] == zio); | |
1963 | dde->dde_lead_zio[p] = NULL; | |
1964 | ||
1965 | if (zio->io_error == 0) { | |
1966 | ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); | |
1967 | ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); | |
1968 | ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); | |
1969 | if (ddp->ddp_phys_birth != 0) | |
1970 | ddt_phys_free(ddt, ddk, ddp, zio->io_txg); | |
1971 | ddt_phys_fill(ddp, bp); | |
1972 | } | |
1973 | ||
1974 | ddt_exit(ddt); | |
1975 | } | |
1976 | ||
1977 | static int | |
1978 | zio_ddt_write(zio_t *zio) | |
1979 | { | |
1980 | spa_t *spa = zio->io_spa; | |
1981 | blkptr_t *bp = zio->io_bp; | |
1982 | uint64_t txg = zio->io_txg; | |
1983 | zio_prop_t *zp = &zio->io_prop; | |
1984 | int p = zp->zp_copies; | |
1985 | int ditto_copies; | |
1986 | zio_t *cio = NULL; | |
1987 | zio_t *dio = NULL; | |
1988 | ddt_t *ddt = ddt_select(spa, bp); | |
1989 | ddt_entry_t *dde; | |
1990 | ddt_phys_t *ddp; | |
1991 | ||
1992 | ASSERT(BP_GET_DEDUP(bp)); | |
1993 | ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); | |
1994 | ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); | |
1995 | ||
1996 | ddt_enter(ddt); | |
1997 | dde = ddt_lookup(ddt, bp, B_TRUE); | |
1998 | ddp = &dde->dde_phys[p]; | |
1999 | ||
2000 | if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { | |
2001 | /* | |
2002 | * If we're using a weak checksum, upgrade to a strong checksum | |
2003 | * and try again. If we're already using a strong checksum, | |
2004 | * we can't resolve it, so just convert to an ordinary write. | |
2005 | * (And automatically e-mail a paper to Nature?) | |
2006 | */ | |
2007 | if (!zio_checksum_table[zp->zp_checksum].ci_dedup) { | |
2008 | zp->zp_checksum = spa_dedup_checksum(spa); | |
2009 | zio_pop_transforms(zio); | |
2010 | zio->io_stage = ZIO_STAGE_OPEN; | |
2011 | BP_ZERO(bp); | |
2012 | } else { | |
2013 | zp->zp_dedup = 0; | |
2014 | } | |
2015 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
2016 | ddt_exit(ddt); | |
2017 | return (ZIO_PIPELINE_CONTINUE); | |
2018 | } | |
2019 | ||
2020 | ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); | |
2021 | ASSERT(ditto_copies < SPA_DVAS_PER_BP); | |
2022 | ||
2023 | if (ditto_copies > ddt_ditto_copies_present(dde) && | |
2024 | dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { | |
2025 | zio_prop_t czp = *zp; | |
2026 | ||
2027 | czp.zp_copies = ditto_copies; | |
2028 | ||
2029 | /* | |
2030 | * If we arrived here with an override bp, we won't have run | |
2031 | * the transform stack, so we won't have the data we need to | |
2032 | * generate a child i/o. So, toss the override bp and restart. | |
2033 | * This is safe, because using the override bp is just an | |
2034 | * optimization; and it's rare, so the cost doesn't matter. | |
2035 | */ | |
2036 | if (zio->io_bp_override) { | |
2037 | zio_pop_transforms(zio); | |
2038 | zio->io_stage = ZIO_STAGE_OPEN; | |
2039 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
2040 | zio->io_bp_override = NULL; | |
2041 | BP_ZERO(bp); | |
2042 | ddt_exit(ddt); | |
2043 | return (ZIO_PIPELINE_CONTINUE); | |
2044 | } | |
2045 | ||
2046 | dio = zio_write(zio, spa, txg, bp, zio->io_orig_data, | |
2047 | zio->io_orig_size, &czp, NULL, | |
2048 | zio_ddt_ditto_write_done, dde, zio->io_priority, | |
2049 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); | |
2050 | ||
2051 | zio_push_transform(dio, zio->io_data, zio->io_size, 0, NULL); | |
2052 | dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; | |
2053 | } | |
2054 | ||
2055 | if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { | |
2056 | if (ddp->ddp_phys_birth != 0) | |
2057 | ddt_bp_fill(ddp, bp, txg); | |
2058 | if (dde->dde_lead_zio[p] != NULL) | |
2059 | zio_add_child(zio, dde->dde_lead_zio[p]); | |
2060 | else | |
2061 | ddt_phys_addref(ddp); | |
2062 | } else if (zio->io_bp_override) { | |
2063 | ASSERT(bp->blk_birth == txg); | |
2064 | ASSERT(BP_EQUAL(bp, zio->io_bp_override)); | |
2065 | ddt_phys_fill(ddp, bp); | |
2066 | ddt_phys_addref(ddp); | |
2067 | } else { | |
2068 | cio = zio_write(zio, spa, txg, bp, zio->io_orig_data, | |
2069 | zio->io_orig_size, zp, zio_ddt_child_write_ready, | |
2070 | zio_ddt_child_write_done, dde, zio->io_priority, | |
2071 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); | |
2072 | ||
2073 | zio_push_transform(cio, zio->io_data, zio->io_size, 0, NULL); | |
2074 | dde->dde_lead_zio[p] = cio; | |
2075 | } | |
2076 | ||
2077 | ddt_exit(ddt); | |
2078 | ||
2079 | if (cio) | |
2080 | zio_nowait(cio); | |
2081 | if (dio) | |
2082 | zio_nowait(dio); | |
2083 | ||
2084 | return (ZIO_PIPELINE_CONTINUE); | |
2085 | } | |
2086 | ||
2087 | ddt_entry_t *freedde; /* for debugging */ | |
b128c09f | 2088 | |
428870ff BB |
2089 | static int |
2090 | zio_ddt_free(zio_t *zio) | |
2091 | { | |
2092 | spa_t *spa = zio->io_spa; | |
2093 | blkptr_t *bp = zio->io_bp; | |
2094 | ddt_t *ddt = ddt_select(spa, bp); | |
2095 | ddt_entry_t *dde; | |
2096 | ddt_phys_t *ddp; | |
2097 | ||
2098 | ASSERT(BP_GET_DEDUP(bp)); | |
2099 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
2100 | ||
2101 | ddt_enter(ddt); | |
2102 | freedde = dde = ddt_lookup(ddt, bp, B_TRUE); | |
2103 | ddp = ddt_phys_select(dde, bp); | |
2104 | ddt_phys_decref(ddp); | |
2105 | ddt_exit(ddt); | |
2106 | ||
2107 | return (ZIO_PIPELINE_CONTINUE); | |
2108 | } | |
2109 | ||
2110 | /* | |
2111 | * ========================================================================== | |
2112 | * Allocate and free blocks | |
2113 | * ========================================================================== | |
2114 | */ | |
34dc7c2f BB |
2115 | static int |
2116 | zio_dva_allocate(zio_t *zio) | |
2117 | { | |
2118 | spa_t *spa = zio->io_spa; | |
428870ff | 2119 | metaslab_class_t *mc = spa_normal_class(spa); |
34dc7c2f BB |
2120 | blkptr_t *bp = zio->io_bp; |
2121 | int error; | |
2122 | ||
9babb374 BB |
2123 | if (zio->io_gang_leader == NULL) { |
2124 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
2125 | zio->io_gang_leader = zio; | |
2126 | } | |
2127 | ||
34dc7c2f BB |
2128 | ASSERT(BP_IS_HOLE(bp)); |
2129 | ASSERT3U(BP_GET_NDVAS(bp), ==, 0); | |
428870ff BB |
2130 | ASSERT3U(zio->io_prop.zp_copies, >, 0); |
2131 | ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); | |
34dc7c2f BB |
2132 | ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); |
2133 | ||
b128c09f | 2134 | error = metaslab_alloc(spa, mc, zio->io_size, bp, |
428870ff | 2135 | zio->io_prop.zp_copies, zio->io_txg, NULL, 0); |
34dc7c2f | 2136 | |
b128c09f BB |
2137 | if (error) { |
2138 | if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) | |
2139 | return (zio_write_gang_block(zio)); | |
34dc7c2f BB |
2140 | zio->io_error = error; |
2141 | } | |
2142 | ||
2143 | return (ZIO_PIPELINE_CONTINUE); | |
2144 | } | |
2145 | ||
2146 | static int | |
2147 | zio_dva_free(zio_t *zio) | |
2148 | { | |
b128c09f | 2149 | metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); |
34dc7c2f BB |
2150 | |
2151 | return (ZIO_PIPELINE_CONTINUE); | |
2152 | } | |
2153 | ||
2154 | static int | |
2155 | zio_dva_claim(zio_t *zio) | |
2156 | { | |
b128c09f BB |
2157 | int error; |
2158 | ||
2159 | error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); | |
2160 | if (error) | |
2161 | zio->io_error = error; | |
34dc7c2f BB |
2162 | |
2163 | return (ZIO_PIPELINE_CONTINUE); | |
2164 | } | |
2165 | ||
b128c09f BB |
2166 | /* |
2167 | * Undo an allocation. This is used by zio_done() when an I/O fails | |
2168 | * and we want to give back the block we just allocated. | |
2169 | * This handles both normal blocks and gang blocks. | |
2170 | */ | |
2171 | static void | |
2172 | zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) | |
2173 | { | |
d6320ddb BB |
2174 | int g; |
2175 | ||
b128c09f | 2176 | ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); |
428870ff | 2177 | ASSERT(zio->io_bp_override == NULL); |
b128c09f BB |
2178 | |
2179 | if (!BP_IS_HOLE(bp)) | |
428870ff | 2180 | metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); |
b128c09f BB |
2181 | |
2182 | if (gn != NULL) { | |
d6320ddb | 2183 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
2184 | zio_dva_unallocate(zio, gn->gn_child[g], |
2185 | &gn->gn_gbh->zg_blkptr[g]); | |
2186 | } | |
2187 | } | |
2188 | } | |
2189 | ||
2190 | /* | |
2191 | * Try to allocate an intent log block. Return 0 on success, errno on failure. | |
2192 | */ | |
2193 | int | |
428870ff BB |
2194 | zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, blkptr_t *old_bp, |
2195 | uint64_t size, boolean_t use_slog) | |
b128c09f | 2196 | { |
428870ff | 2197 | int error = 1; |
b128c09f | 2198 | |
428870ff BB |
2199 | ASSERT(txg > spa_syncing_txg(spa)); |
2200 | ||
2201 | if (use_slog) | |
2202 | error = metaslab_alloc(spa, spa_log_class(spa), size, | |
2203 | new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); | |
b128c09f BB |
2204 | |
2205 | if (error) | |
428870ff | 2206 | error = metaslab_alloc(spa, spa_normal_class(spa), size, |
b128c09f BB |
2207 | new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); |
2208 | ||
2209 | if (error == 0) { | |
2210 | BP_SET_LSIZE(new_bp, size); | |
2211 | BP_SET_PSIZE(new_bp, size); | |
2212 | BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); | |
428870ff BB |
2213 | BP_SET_CHECKSUM(new_bp, |
2214 | spa_version(spa) >= SPA_VERSION_SLIM_ZIL | |
2215 | ? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG); | |
b128c09f BB |
2216 | BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); |
2217 | BP_SET_LEVEL(new_bp, 0); | |
428870ff | 2218 | BP_SET_DEDUP(new_bp, 0); |
b128c09f BB |
2219 | BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); |
2220 | } | |
2221 | ||
2222 | return (error); | |
2223 | } | |
2224 | ||
2225 | /* | |
428870ff | 2226 | * Free an intent log block. |
b128c09f BB |
2227 | */ |
2228 | void | |
428870ff | 2229 | zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp) |
b128c09f | 2230 | { |
428870ff | 2231 | ASSERT(BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG); |
b128c09f BB |
2232 | ASSERT(!BP_IS_GANG(bp)); |
2233 | ||
428870ff | 2234 | zio_free(spa, txg, bp); |
b128c09f BB |
2235 | } |
2236 | ||
34dc7c2f BB |
2237 | /* |
2238 | * ========================================================================== | |
2239 | * Read and write to physical devices | |
2240 | * ========================================================================== | |
2241 | */ | |
34dc7c2f BB |
2242 | static int |
2243 | zio_vdev_io_start(zio_t *zio) | |
2244 | { | |
2245 | vdev_t *vd = zio->io_vd; | |
34dc7c2f BB |
2246 | uint64_t align; |
2247 | spa_t *spa = zio->io_spa; | |
2248 | ||
b128c09f BB |
2249 | ASSERT(zio->io_error == 0); |
2250 | ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); | |
34dc7c2f | 2251 | |
b128c09f BB |
2252 | if (vd == NULL) { |
2253 | if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) | |
2254 | spa_config_enter(spa, SCL_ZIO, zio, RW_READER); | |
34dc7c2f | 2255 | |
b128c09f BB |
2256 | /* |
2257 | * The mirror_ops handle multiple DVAs in a single BP. | |
2258 | */ | |
2259 | return (vdev_mirror_ops.vdev_op_io_start(zio)); | |
34dc7c2f BB |
2260 | } |
2261 | ||
572e2857 BB |
2262 | /* |
2263 | * We keep track of time-sensitive I/Os so that the scan thread | |
2264 | * can quickly react to certain workloads. In particular, we care | |
2265 | * about non-scrubbing, top-level reads and writes with the following | |
2266 | * characteristics: | |
2267 | * - synchronous writes of user data to non-slog devices | |
2268 | * - any reads of user data | |
2269 | * When these conditions are met, adjust the timestamp of spa_last_io | |
2270 | * which allows the scan thread to adjust its workload accordingly. | |
2271 | */ | |
2272 | if (!(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && zio->io_bp != NULL && | |
2273 | vd == vd->vdev_top && !vd->vdev_islog && | |
2274 | zio->io_bookmark.zb_objset != DMU_META_OBJSET && | |
2275 | zio->io_txg != spa_syncing_txg(spa)) { | |
2276 | uint64_t old = spa->spa_last_io; | |
2277 | uint64_t new = ddi_get_lbolt64(); | |
2278 | if (old != new) | |
2279 | (void) atomic_cas_64(&spa->spa_last_io, old, new); | |
2280 | } | |
2281 | ||
b128c09f BB |
2282 | align = 1ULL << vd->vdev_top->vdev_ashift; |
2283 | ||
34dc7c2f BB |
2284 | if (P2PHASE(zio->io_size, align) != 0) { |
2285 | uint64_t asize = P2ROUNDUP(zio->io_size, align); | |
2286 | char *abuf = zio_buf_alloc(asize); | |
b128c09f | 2287 | ASSERT(vd == vd->vdev_top); |
34dc7c2f BB |
2288 | if (zio->io_type == ZIO_TYPE_WRITE) { |
2289 | bcopy(zio->io_data, abuf, zio->io_size); | |
2290 | bzero(abuf + zio->io_size, asize - zio->io_size); | |
2291 | } | |
b128c09f | 2292 | zio_push_transform(zio, abuf, asize, asize, zio_subblock); |
34dc7c2f BB |
2293 | } |
2294 | ||
2295 | ASSERT(P2PHASE(zio->io_offset, align) == 0); | |
2296 | ASSERT(P2PHASE(zio->io_size, align) == 0); | |
572e2857 | 2297 | VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); |
fb5f0bc8 BB |
2298 | |
2299 | /* | |
2300 | * If this is a repair I/O, and there's no self-healing involved -- | |
2301 | * that is, we're just resilvering what we expect to resilver -- | |
2302 | * then don't do the I/O unless zio's txg is actually in vd's DTL. | |
2303 | * This prevents spurious resilvering with nested replication. | |
2304 | * For example, given a mirror of mirrors, (A+B)+(C+D), if only | |
2305 | * A is out of date, we'll read from C+D, then use the data to | |
2306 | * resilver A+B -- but we don't actually want to resilver B, just A. | |
2307 | * The top-level mirror has no way to know this, so instead we just | |
2308 | * discard unnecessary repairs as we work our way down the vdev tree. | |
2309 | * The same logic applies to any form of nested replication: | |
2310 | * ditto + mirror, RAID-Z + replacing, etc. This covers them all. | |
2311 | */ | |
2312 | if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && | |
2313 | !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && | |
2314 | zio->io_txg != 0 && /* not a delegated i/o */ | |
2315 | !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { | |
2316 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); | |
fb5f0bc8 BB |
2317 | zio_vdev_io_bypass(zio); |
2318 | return (ZIO_PIPELINE_CONTINUE); | |
2319 | } | |
34dc7c2f | 2320 | |
b128c09f BB |
2321 | if (vd->vdev_ops->vdev_op_leaf && |
2322 | (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { | |
2323 | ||
2324 | if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) | |
d164b209 | 2325 | return (ZIO_PIPELINE_CONTINUE); |
b128c09f BB |
2326 | |
2327 | if ((zio = vdev_queue_io(zio)) == NULL) | |
2328 | return (ZIO_PIPELINE_STOP); | |
2329 | ||
2330 | if (!vdev_accessible(vd, zio)) { | |
2331 | zio->io_error = ENXIO; | |
2332 | zio_interrupt(zio); | |
2333 | return (ZIO_PIPELINE_STOP); | |
2334 | } | |
b128c09f BB |
2335 | } |
2336 | ||
34dc7c2f BB |
2337 | return (vd->vdev_ops->vdev_op_io_start(zio)); |
2338 | } | |
2339 | ||
2340 | static int | |
2341 | zio_vdev_io_done(zio_t *zio) | |
2342 | { | |
b128c09f BB |
2343 | vdev_t *vd = zio->io_vd; |
2344 | vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; | |
2345 | boolean_t unexpected_error = B_FALSE; | |
34dc7c2f | 2346 | |
b128c09f BB |
2347 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) |
2348 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 2349 | |
b128c09f BB |
2350 | ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); |
2351 | ||
2352 | if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { | |
2353 | ||
2354 | vdev_queue_io_done(zio); | |
2355 | ||
2356 | if (zio->io_type == ZIO_TYPE_WRITE) | |
2357 | vdev_cache_write(zio); | |
2358 | ||
2359 | if (zio_injection_enabled && zio->io_error == 0) | |
9babb374 BB |
2360 | zio->io_error = zio_handle_device_injection(vd, |
2361 | zio, EIO); | |
b128c09f BB |
2362 | |
2363 | if (zio_injection_enabled && zio->io_error == 0) | |
2364 | zio->io_error = zio_handle_label_injection(zio, EIO); | |
2365 | ||
2366 | if (zio->io_error) { | |
2367 | if (!vdev_accessible(vd, zio)) { | |
2368 | zio->io_error = ENXIO; | |
2369 | } else { | |
2370 | unexpected_error = B_TRUE; | |
2371 | } | |
2372 | } | |
2373 | } | |
2374 | ||
2375 | ops->vdev_op_io_done(zio); | |
34dc7c2f | 2376 | |
b128c09f | 2377 | if (unexpected_error) |
d164b209 | 2378 | VERIFY(vdev_probe(vd, zio) == NULL); |
34dc7c2f | 2379 | |
b128c09f | 2380 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
2381 | } |
2382 | ||
428870ff BB |
2383 | /* |
2384 | * For non-raidz ZIOs, we can just copy aside the bad data read from the | |
2385 | * disk, and use that to finish the checksum ereport later. | |
2386 | */ | |
2387 | static void | |
2388 | zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, | |
2389 | const void *good_buf) | |
2390 | { | |
2391 | /* no processing needed */ | |
2392 | zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); | |
2393 | } | |
2394 | ||
2395 | /*ARGSUSED*/ | |
2396 | void | |
2397 | zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) | |
2398 | { | |
2399 | void *buf = zio_buf_alloc(zio->io_size); | |
2400 | ||
2401 | bcopy(zio->io_data, buf, zio->io_size); | |
2402 | ||
2403 | zcr->zcr_cbinfo = zio->io_size; | |
2404 | zcr->zcr_cbdata = buf; | |
2405 | zcr->zcr_finish = zio_vsd_default_cksum_finish; | |
2406 | zcr->zcr_free = zio_buf_free; | |
2407 | } | |
2408 | ||
34dc7c2f BB |
2409 | static int |
2410 | zio_vdev_io_assess(zio_t *zio) | |
2411 | { | |
2412 | vdev_t *vd = zio->io_vd; | |
b128c09f BB |
2413 | |
2414 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) | |
2415 | return (ZIO_PIPELINE_STOP); | |
2416 | ||
2417 | if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) | |
2418 | spa_config_exit(zio->io_spa, SCL_ZIO, zio); | |
2419 | ||
2420 | if (zio->io_vsd != NULL) { | |
428870ff | 2421 | zio->io_vsd_ops->vsd_free(zio); |
b128c09f | 2422 | zio->io_vsd = NULL; |
34dc7c2f BB |
2423 | } |
2424 | ||
b128c09f | 2425 | if (zio_injection_enabled && zio->io_error == 0) |
34dc7c2f BB |
2426 | zio->io_error = zio_handle_fault_injection(zio, EIO); |
2427 | ||
2428 | /* | |
2429 | * If the I/O failed, determine whether we should attempt to retry it. | |
428870ff BB |
2430 | * |
2431 | * On retry, we cut in line in the issue queue, since we don't want | |
2432 | * compression/checksumming/etc. work to prevent our (cheap) IO reissue. | |
34dc7c2f | 2433 | */ |
b128c09f BB |
2434 | if (zio->io_error && vd == NULL && |
2435 | !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { | |
2436 | ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ | |
2437 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ | |
34dc7c2f | 2438 | zio->io_error = 0; |
b128c09f BB |
2439 | zio->io_flags |= ZIO_FLAG_IO_RETRY | |
2440 | ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; | |
428870ff BB |
2441 | zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; |
2442 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, | |
2443 | zio_requeue_io_start_cut_in_line); | |
b128c09f | 2444 | return (ZIO_PIPELINE_STOP); |
34dc7c2f BB |
2445 | } |
2446 | ||
b128c09f BB |
2447 | /* |
2448 | * If we got an error on a leaf device, convert it to ENXIO | |
2449 | * if the device is not accessible at all. | |
2450 | */ | |
2451 | if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && | |
2452 | !vdev_accessible(vd, zio)) | |
2453 | zio->io_error = ENXIO; | |
2454 | ||
2455 | /* | |
2456 | * If we can't write to an interior vdev (mirror or RAID-Z), | |
2457 | * set vdev_cant_write so that we stop trying to allocate from it. | |
2458 | */ | |
2459 | if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && | |
2460 | vd != NULL && !vd->vdev_ops->vdev_op_leaf) | |
2461 | vd->vdev_cant_write = B_TRUE; | |
2462 | ||
2463 | if (zio->io_error) | |
2464 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
2465 | ||
34dc7c2f BB |
2466 | return (ZIO_PIPELINE_CONTINUE); |
2467 | } | |
2468 | ||
2469 | void | |
2470 | zio_vdev_io_reissue(zio_t *zio) | |
2471 | { | |
2472 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); | |
2473 | ASSERT(zio->io_error == 0); | |
2474 | ||
428870ff | 2475 | zio->io_stage >>= 1; |
34dc7c2f BB |
2476 | } |
2477 | ||
2478 | void | |
2479 | zio_vdev_io_redone(zio_t *zio) | |
2480 | { | |
2481 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); | |
2482 | ||
428870ff | 2483 | zio->io_stage >>= 1; |
34dc7c2f BB |
2484 | } |
2485 | ||
2486 | void | |
2487 | zio_vdev_io_bypass(zio_t *zio) | |
2488 | { | |
2489 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); | |
2490 | ASSERT(zio->io_error == 0); | |
2491 | ||
2492 | zio->io_flags |= ZIO_FLAG_IO_BYPASS; | |
428870ff | 2493 | zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; |
34dc7c2f BB |
2494 | } |
2495 | ||
2496 | /* | |
2497 | * ========================================================================== | |
2498 | * Generate and verify checksums | |
2499 | * ========================================================================== | |
2500 | */ | |
2501 | static int | |
2502 | zio_checksum_generate(zio_t *zio) | |
2503 | { | |
34dc7c2f | 2504 | blkptr_t *bp = zio->io_bp; |
b128c09f | 2505 | enum zio_checksum checksum; |
34dc7c2f | 2506 | |
b128c09f BB |
2507 | if (bp == NULL) { |
2508 | /* | |
2509 | * This is zio_write_phys(). | |
2510 | * We're either generating a label checksum, or none at all. | |
2511 | */ | |
2512 | checksum = zio->io_prop.zp_checksum; | |
34dc7c2f | 2513 | |
b128c09f BB |
2514 | if (checksum == ZIO_CHECKSUM_OFF) |
2515 | return (ZIO_PIPELINE_CONTINUE); | |
2516 | ||
2517 | ASSERT(checksum == ZIO_CHECKSUM_LABEL); | |
2518 | } else { | |
2519 | if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { | |
2520 | ASSERT(!IO_IS_ALLOCATING(zio)); | |
2521 | checksum = ZIO_CHECKSUM_GANG_HEADER; | |
2522 | } else { | |
2523 | checksum = BP_GET_CHECKSUM(bp); | |
2524 | } | |
2525 | } | |
34dc7c2f | 2526 | |
b128c09f | 2527 | zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); |
34dc7c2f BB |
2528 | |
2529 | return (ZIO_PIPELINE_CONTINUE); | |
2530 | } | |
2531 | ||
2532 | static int | |
b128c09f | 2533 | zio_checksum_verify(zio_t *zio) |
34dc7c2f | 2534 | { |
428870ff | 2535 | zio_bad_cksum_t info; |
b128c09f BB |
2536 | blkptr_t *bp = zio->io_bp; |
2537 | int error; | |
34dc7c2f | 2538 | |
428870ff BB |
2539 | ASSERT(zio->io_vd != NULL); |
2540 | ||
b128c09f BB |
2541 | if (bp == NULL) { |
2542 | /* | |
2543 | * This is zio_read_phys(). | |
2544 | * We're either verifying a label checksum, or nothing at all. | |
2545 | */ | |
2546 | if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) | |
2547 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f | 2548 | |
b128c09f BB |
2549 | ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); |
2550 | } | |
34dc7c2f | 2551 | |
428870ff | 2552 | if ((error = zio_checksum_error(zio, &info)) != 0) { |
b128c09f BB |
2553 | zio->io_error = error; |
2554 | if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { | |
428870ff BB |
2555 | zfs_ereport_start_checksum(zio->io_spa, |
2556 | zio->io_vd, zio, zio->io_offset, | |
2557 | zio->io_size, NULL, &info); | |
b128c09f | 2558 | } |
34dc7c2f BB |
2559 | } |
2560 | ||
2561 | return (ZIO_PIPELINE_CONTINUE); | |
2562 | } | |
2563 | ||
2564 | /* | |
2565 | * Called by RAID-Z to ensure we don't compute the checksum twice. | |
2566 | */ | |
2567 | void | |
2568 | zio_checksum_verified(zio_t *zio) | |
2569 | { | |
428870ff | 2570 | zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; |
34dc7c2f BB |
2571 | } |
2572 | ||
2573 | /* | |
b128c09f BB |
2574 | * ========================================================================== |
2575 | * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. | |
2576 | * An error of 0 indictes success. ENXIO indicates whole-device failure, | |
2577 | * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO | |
2578 | * indicate errors that are specific to one I/O, and most likely permanent. | |
2579 | * Any other error is presumed to be worse because we weren't expecting it. | |
2580 | * ========================================================================== | |
34dc7c2f | 2581 | */ |
b128c09f BB |
2582 | int |
2583 | zio_worst_error(int e1, int e2) | |
34dc7c2f | 2584 | { |
b128c09f BB |
2585 | static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; |
2586 | int r1, r2; | |
2587 | ||
2588 | for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) | |
2589 | if (e1 == zio_error_rank[r1]) | |
2590 | break; | |
34dc7c2f | 2591 | |
b128c09f BB |
2592 | for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) |
2593 | if (e2 == zio_error_rank[r2]) | |
2594 | break; | |
2595 | ||
2596 | return (r1 > r2 ? e1 : e2); | |
34dc7c2f BB |
2597 | } |
2598 | ||
2599 | /* | |
2600 | * ========================================================================== | |
b128c09f | 2601 | * I/O completion |
34dc7c2f BB |
2602 | * ========================================================================== |
2603 | */ | |
b128c09f BB |
2604 | static int |
2605 | zio_ready(zio_t *zio) | |
34dc7c2f | 2606 | { |
b128c09f | 2607 | blkptr_t *bp = zio->io_bp; |
d164b209 | 2608 | zio_t *pio, *pio_next; |
34dc7c2f | 2609 | |
428870ff BB |
2610 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || |
2611 | zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_READY)) | |
9babb374 | 2612 | return (ZIO_PIPELINE_STOP); |
34dc7c2f | 2613 | |
9babb374 | 2614 | if (zio->io_ready) { |
b128c09f BB |
2615 | ASSERT(IO_IS_ALLOCATING(zio)); |
2616 | ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); | |
2617 | ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); | |
34dc7c2f | 2618 | |
b128c09f BB |
2619 | zio->io_ready(zio); |
2620 | } | |
34dc7c2f | 2621 | |
b128c09f BB |
2622 | if (bp != NULL && bp != &zio->io_bp_copy) |
2623 | zio->io_bp_copy = *bp; | |
34dc7c2f | 2624 | |
b128c09f BB |
2625 | if (zio->io_error) |
2626 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
34dc7c2f | 2627 | |
d164b209 BB |
2628 | mutex_enter(&zio->io_lock); |
2629 | zio->io_state[ZIO_WAIT_READY] = 1; | |
2630 | pio = zio_walk_parents(zio); | |
2631 | mutex_exit(&zio->io_lock); | |
2632 | ||
2633 | /* | |
2634 | * As we notify zio's parents, new parents could be added. | |
2635 | * New parents go to the head of zio's io_parent_list, however, | |
2636 | * so we will (correctly) not notify them. The remainder of zio's | |
2637 | * io_parent_list, from 'pio_next' onward, cannot change because | |
2638 | * all parents must wait for us to be done before they can be done. | |
2639 | */ | |
2640 | for (; pio != NULL; pio = pio_next) { | |
2641 | pio_next = zio_walk_parents(zio); | |
b128c09f | 2642 | zio_notify_parent(pio, zio, ZIO_WAIT_READY); |
d164b209 | 2643 | } |
34dc7c2f | 2644 | |
428870ff BB |
2645 | if (zio->io_flags & ZIO_FLAG_NODATA) { |
2646 | if (BP_IS_GANG(bp)) { | |
2647 | zio->io_flags &= ~ZIO_FLAG_NODATA; | |
2648 | } else { | |
2649 | ASSERT((uintptr_t)zio->io_data < SPA_MAXBLOCKSIZE); | |
2650 | zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; | |
2651 | } | |
2652 | } | |
2653 | ||
2654 | if (zio_injection_enabled && | |
2655 | zio->io_spa->spa_syncing_txg == zio->io_txg) | |
2656 | zio_handle_ignored_writes(zio); | |
2657 | ||
b128c09f | 2658 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
2659 | } |
2660 | ||
b128c09f BB |
2661 | static int |
2662 | zio_done(zio_t *zio) | |
34dc7c2f | 2663 | { |
b128c09f | 2664 | spa_t *spa = zio->io_spa; |
b128c09f BB |
2665 | zio_t *lio = zio->io_logical; |
2666 | blkptr_t *bp = zio->io_bp; | |
2667 | vdev_t *vd = zio->io_vd; | |
2668 | uint64_t psize = zio->io_size; | |
d164b209 | 2669 | zio_t *pio, *pio_next; |
d6320ddb | 2670 | int c, w; |
34dc7c2f | 2671 | |
b128c09f | 2672 | /* |
9babb374 | 2673 | * If our children haven't all completed, |
b128c09f BB |
2674 | * wait for them and then repeat this pipeline stage. |
2675 | */ | |
2676 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || | |
2677 | zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || | |
428870ff | 2678 | zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE) || |
b128c09f BB |
2679 | zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) |
2680 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 2681 | |
d6320ddb BB |
2682 | for (c = 0; c < ZIO_CHILD_TYPES; c++) |
2683 | for (w = 0; w < ZIO_WAIT_TYPES; w++) | |
b128c09f BB |
2684 | ASSERT(zio->io_children[c][w] == 0); |
2685 | ||
2686 | if (bp != NULL) { | |
2687 | ASSERT(bp->blk_pad[0] == 0); | |
2688 | ASSERT(bp->blk_pad[1] == 0); | |
b128c09f | 2689 | ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || |
d164b209 | 2690 | (bp == zio_unique_parent(zio)->io_bp)); |
b128c09f | 2691 | if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && |
428870ff | 2692 | zio->io_bp_override == NULL && |
b128c09f BB |
2693 | !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { |
2694 | ASSERT(!BP_SHOULD_BYTESWAP(bp)); | |
428870ff | 2695 | ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(bp)); |
b128c09f BB |
2696 | ASSERT(BP_COUNT_GANG(bp) == 0 || |
2697 | (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); | |
2698 | } | |
2699 | } | |
2700 | ||
2701 | /* | |
428870ff | 2702 | * If there were child vdev/gang/ddt errors, they apply to us now. |
b128c09f BB |
2703 | */ |
2704 | zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); | |
2705 | zio_inherit_child_errors(zio, ZIO_CHILD_GANG); | |
428870ff BB |
2706 | zio_inherit_child_errors(zio, ZIO_CHILD_DDT); |
2707 | ||
2708 | /* | |
2709 | * If the I/O on the transformed data was successful, generate any | |
2710 | * checksum reports now while we still have the transformed data. | |
2711 | */ | |
2712 | if (zio->io_error == 0) { | |
2713 | while (zio->io_cksum_report != NULL) { | |
2714 | zio_cksum_report_t *zcr = zio->io_cksum_report; | |
2715 | uint64_t align = zcr->zcr_align; | |
2716 | uint64_t asize = P2ROUNDUP(psize, align); | |
2717 | char *abuf = zio->io_data; | |
2718 | ||
2719 | if (asize != psize) { | |
2720 | abuf = zio_buf_alloc(asize); | |
2721 | bcopy(zio->io_data, abuf, psize); | |
2722 | bzero(abuf + psize, asize - psize); | |
2723 | } | |
2724 | ||
2725 | zio->io_cksum_report = zcr->zcr_next; | |
2726 | zcr->zcr_next = NULL; | |
2727 | zcr->zcr_finish(zcr, abuf); | |
2728 | zfs_ereport_free_checksum(zcr); | |
2729 | ||
2730 | if (asize != psize) | |
2731 | zio_buf_free(abuf, asize); | |
2732 | } | |
2733 | } | |
b128c09f BB |
2734 | |
2735 | zio_pop_transforms(zio); /* note: may set zio->io_error */ | |
2736 | ||
2737 | vdev_stat_update(zio, psize); | |
2738 | ||
2739 | if (zio->io_error) { | |
2740 | /* | |
2741 | * If this I/O is attached to a particular vdev, | |
2742 | * generate an error message describing the I/O failure | |
2743 | * at the block level. We ignore these errors if the | |
2744 | * device is currently unavailable. | |
2745 | */ | |
2746 | if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) | |
2747 | zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, zio, 0, 0); | |
34dc7c2f | 2748 | |
428870ff BB |
2749 | if ((zio->io_error == EIO || !(zio->io_flags & |
2750 | (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && | |
2751 | zio == lio) { | |
b128c09f BB |
2752 | /* |
2753 | * For logical I/O requests, tell the SPA to log the | |
2754 | * error and generate a logical data ereport. | |
2755 | */ | |
2756 | spa_log_error(spa, zio); | |
2757 | zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, zio, | |
2758 | 0, 0); | |
2759 | } | |
2760 | } | |
34dc7c2f | 2761 | |
b128c09f BB |
2762 | if (zio->io_error && zio == lio) { |
2763 | /* | |
2764 | * Determine whether zio should be reexecuted. This will | |
2765 | * propagate all the way to the root via zio_notify_parent(). | |
2766 | */ | |
2767 | ASSERT(vd == NULL && bp != NULL); | |
428870ff | 2768 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); |
b128c09f | 2769 | |
428870ff BB |
2770 | if (IO_IS_ALLOCATING(zio) && |
2771 | !(zio->io_flags & ZIO_FLAG_CANFAIL)) { | |
b128c09f BB |
2772 | if (zio->io_error != ENOSPC) |
2773 | zio->io_reexecute |= ZIO_REEXECUTE_NOW; | |
2774 | else | |
2775 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
428870ff | 2776 | } |
b128c09f BB |
2777 | |
2778 | if ((zio->io_type == ZIO_TYPE_READ || | |
2779 | zio->io_type == ZIO_TYPE_FREE) && | |
572e2857 | 2780 | !(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && |
b128c09f | 2781 | zio->io_error == ENXIO && |
428870ff | 2782 | spa_load_state(spa) == SPA_LOAD_NONE && |
b128c09f BB |
2783 | spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) |
2784 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
2785 | ||
2786 | if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) | |
2787 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
428870ff BB |
2788 | |
2789 | /* | |
2790 | * Here is a possibly good place to attempt to do | |
2791 | * either combinatorial reconstruction or error correction | |
2792 | * based on checksums. It also might be a good place | |
2793 | * to send out preliminary ereports before we suspend | |
2794 | * processing. | |
2795 | */ | |
34dc7c2f BB |
2796 | } |
2797 | ||
2798 | /* | |
b128c09f BB |
2799 | * If there were logical child errors, they apply to us now. |
2800 | * We defer this until now to avoid conflating logical child | |
2801 | * errors with errors that happened to the zio itself when | |
2802 | * updating vdev stats and reporting FMA events above. | |
34dc7c2f | 2803 | */ |
b128c09f | 2804 | zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); |
34dc7c2f | 2805 | |
428870ff BB |
2806 | if ((zio->io_error || zio->io_reexecute) && |
2807 | IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && | |
2808 | !(zio->io_flags & ZIO_FLAG_IO_REWRITE)) | |
9babb374 | 2809 | zio_dva_unallocate(zio, zio->io_gang_tree, bp); |
9babb374 BB |
2810 | |
2811 | zio_gang_tree_free(&zio->io_gang_tree); | |
2812 | ||
2813 | /* | |
2814 | * Godfather I/Os should never suspend. | |
2815 | */ | |
2816 | if ((zio->io_flags & ZIO_FLAG_GODFATHER) && | |
2817 | (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) | |
2818 | zio->io_reexecute = 0; | |
2819 | ||
b128c09f BB |
2820 | if (zio->io_reexecute) { |
2821 | /* | |
2822 | * This is a logical I/O that wants to reexecute. | |
2823 | * | |
2824 | * Reexecute is top-down. When an i/o fails, if it's not | |
2825 | * the root, it simply notifies its parent and sticks around. | |
2826 | * The parent, seeing that it still has children in zio_done(), | |
2827 | * does the same. This percolates all the way up to the root. | |
2828 | * The root i/o will reexecute or suspend the entire tree. | |
2829 | * | |
2830 | * This approach ensures that zio_reexecute() honors | |
2831 | * all the original i/o dependency relationships, e.g. | |
2832 | * parents not executing until children are ready. | |
2833 | */ | |
2834 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
34dc7c2f | 2835 | |
9babb374 | 2836 | zio->io_gang_leader = NULL; |
b128c09f | 2837 | |
d164b209 BB |
2838 | mutex_enter(&zio->io_lock); |
2839 | zio->io_state[ZIO_WAIT_DONE] = 1; | |
2840 | mutex_exit(&zio->io_lock); | |
2841 | ||
9babb374 BB |
2842 | /* |
2843 | * "The Godfather" I/O monitors its children but is | |
2844 | * not a true parent to them. It will track them through | |
2845 | * the pipeline but severs its ties whenever they get into | |
2846 | * trouble (e.g. suspended). This allows "The Godfather" | |
2847 | * I/O to return status without blocking. | |
2848 | */ | |
2849 | for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { | |
2850 | zio_link_t *zl = zio->io_walk_link; | |
2851 | pio_next = zio_walk_parents(zio); | |
2852 | ||
2853 | if ((pio->io_flags & ZIO_FLAG_GODFATHER) && | |
2854 | (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { | |
2855 | zio_remove_child(pio, zio, zl); | |
2856 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); | |
2857 | } | |
2858 | } | |
2859 | ||
d164b209 | 2860 | if ((pio = zio_unique_parent(zio)) != NULL) { |
b128c09f BB |
2861 | /* |
2862 | * We're not a root i/o, so there's nothing to do | |
2863 | * but notify our parent. Don't propagate errors | |
2864 | * upward since we haven't permanently failed yet. | |
2865 | */ | |
9babb374 | 2866 | ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); |
b128c09f BB |
2867 | zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; |
2868 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); | |
2869 | } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { | |
2870 | /* | |
2871 | * We'd fail again if we reexecuted now, so suspend | |
2872 | * until conditions improve (e.g. device comes online). | |
2873 | */ | |
2874 | zio_suspend(spa, zio); | |
2875 | } else { | |
2876 | /* | |
2877 | * Reexecution is potentially a huge amount of work. | |
2878 | * Hand it off to the otherwise-unused claim taskq. | |
2879 | */ | |
2880 | (void) taskq_dispatch( | |
2881 | spa->spa_zio_taskq[ZIO_TYPE_CLAIM][ZIO_TASKQ_ISSUE], | |
2882 | (task_func_t *)zio_reexecute, zio, TQ_SLEEP); | |
2883 | } | |
2884 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
2885 | } |
2886 | ||
428870ff | 2887 | ASSERT(zio->io_child_count == 0); |
b128c09f BB |
2888 | ASSERT(zio->io_reexecute == 0); |
2889 | ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); | |
34dc7c2f | 2890 | |
428870ff BB |
2891 | /* |
2892 | * Report any checksum errors, since the I/O is complete. | |
2893 | */ | |
2894 | while (zio->io_cksum_report != NULL) { | |
2895 | zio_cksum_report_t *zcr = zio->io_cksum_report; | |
2896 | zio->io_cksum_report = zcr->zcr_next; | |
2897 | zcr->zcr_next = NULL; | |
2898 | zcr->zcr_finish(zcr, NULL); | |
2899 | zfs_ereport_free_checksum(zcr); | |
2900 | } | |
2901 | ||
d164b209 BB |
2902 | /* |
2903 | * It is the responsibility of the done callback to ensure that this | |
2904 | * particular zio is no longer discoverable for adoption, and as | |
2905 | * such, cannot acquire any new parents. | |
2906 | */ | |
b128c09f BB |
2907 | if (zio->io_done) |
2908 | zio->io_done(zio); | |
34dc7c2f | 2909 | |
d164b209 BB |
2910 | mutex_enter(&zio->io_lock); |
2911 | zio->io_state[ZIO_WAIT_DONE] = 1; | |
2912 | mutex_exit(&zio->io_lock); | |
34dc7c2f | 2913 | |
d164b209 BB |
2914 | for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { |
2915 | zio_link_t *zl = zio->io_walk_link; | |
2916 | pio_next = zio_walk_parents(zio); | |
2917 | zio_remove_child(pio, zio, zl); | |
b128c09f BB |
2918 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); |
2919 | } | |
34dc7c2f | 2920 | |
b128c09f BB |
2921 | if (zio->io_waiter != NULL) { |
2922 | mutex_enter(&zio->io_lock); | |
2923 | zio->io_executor = NULL; | |
2924 | cv_broadcast(&zio->io_cv); | |
2925 | mutex_exit(&zio->io_lock); | |
2926 | } else { | |
2927 | zio_destroy(zio); | |
2928 | } | |
34dc7c2f | 2929 | |
b128c09f | 2930 | return (ZIO_PIPELINE_STOP); |
34dc7c2f BB |
2931 | } |
2932 | ||
2933 | /* | |
b128c09f BB |
2934 | * ========================================================================== |
2935 | * I/O pipeline definition | |
2936 | * ========================================================================== | |
34dc7c2f | 2937 | */ |
428870ff | 2938 | static zio_pipe_stage_t *zio_pipeline[] = { |
b128c09f | 2939 | NULL, |
b128c09f | 2940 | zio_read_bp_init, |
428870ff BB |
2941 | zio_free_bp_init, |
2942 | zio_issue_async, | |
b128c09f BB |
2943 | zio_write_bp_init, |
2944 | zio_checksum_generate, | |
428870ff BB |
2945 | zio_ddt_read_start, |
2946 | zio_ddt_read_done, | |
2947 | zio_ddt_write, | |
2948 | zio_ddt_free, | |
b128c09f BB |
2949 | zio_gang_assemble, |
2950 | zio_gang_issue, | |
2951 | zio_dva_allocate, | |
2952 | zio_dva_free, | |
2953 | zio_dva_claim, | |
2954 | zio_ready, | |
2955 | zio_vdev_io_start, | |
2956 | zio_vdev_io_done, | |
2957 | zio_vdev_io_assess, | |
2958 | zio_checksum_verify, | |
2959 | zio_done | |
2960 | }; |