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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. |
9bd274dd | 23 | * Copyright (c) 2011, 2014 by Delphix. All rights reserved. |
a38718a6 | 24 | * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved. |
34dc7c2f BB |
25 | */ |
26 | ||
34dc7c2f BB |
27 | #include <sys/zfs_context.h> |
28 | #include <sys/fm/fs/zfs.h> | |
29 | #include <sys/spa.h> | |
30 | #include <sys/txg.h> | |
31 | #include <sys/spa_impl.h> | |
32 | #include <sys/vdev_impl.h> | |
33 | #include <sys/zio_impl.h> | |
34 | #include <sys/zio_compress.h> | |
35 | #include <sys/zio_checksum.h> | |
428870ff BB |
36 | #include <sys/dmu_objset.h> |
37 | #include <sys/arc.h> | |
38 | #include <sys/ddt.h> | |
9b67f605 | 39 | #include <sys/blkptr.h> |
b0bc7a84 | 40 | #include <sys/zfeature.h> |
34dc7c2f | 41 | |
34dc7c2f BB |
42 | /* |
43 | * ========================================================================== | |
44 | * I/O type descriptions | |
45 | * ========================================================================== | |
46 | */ | |
e8b96c60 | 47 | const char *zio_type_name[ZIO_TYPES] = { |
451041db | 48 | "z_null", "z_rd", "z_wr", "z_fr", "z_cl", "z_ioctl" |
428870ff | 49 | }; |
34dc7c2f BB |
50 | |
51 | /* | |
52 | * ========================================================================== | |
53 | * I/O kmem caches | |
54 | * ========================================================================== | |
55 | */ | |
56 | kmem_cache_t *zio_cache; | |
d164b209 | 57 | kmem_cache_t *zio_link_cache; |
34dc7c2f BB |
58 | kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; |
59 | kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; | |
a69052be | 60 | int zio_delay_max = ZIO_DELAY_MAX; |
34dc7c2f | 61 | |
98b25418 GW |
62 | #define ZIO_PIPELINE_CONTINUE 0x100 |
63 | #define ZIO_PIPELINE_STOP 0x101 | |
64 | ||
55d85d5a GW |
65 | /* |
66 | * The following actions directly effect the spa's sync-to-convergence logic. | |
67 | * The values below define the sync pass when we start performing the action. | |
68 | * Care should be taken when changing these values as they directly impact | |
69 | * spa_sync() performance. Tuning these values may introduce subtle performance | |
70 | * pathologies and should only be done in the context of performance analysis. | |
71 | * These tunables will eventually be removed and replaced with #defines once | |
72 | * enough analysis has been done to determine optimal values. | |
73 | * | |
74 | * The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that | |
75 | * regular blocks are not deferred. | |
76 | */ | |
77 | int zfs_sync_pass_deferred_free = 2; /* defer frees starting in this pass */ | |
78 | int zfs_sync_pass_dont_compress = 5; /* don't compress starting in this pass */ | |
79 | int zfs_sync_pass_rewrite = 2; /* rewrite new bps starting in this pass */ | |
80 | ||
34dc7c2f | 81 | /* |
b128c09f BB |
82 | * An allocating zio is one that either currently has the DVA allocate |
83 | * stage set or will have it later in its lifetime. | |
34dc7c2f | 84 | */ |
428870ff BB |
85 | #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) |
86 | ||
c409e464 | 87 | int zio_requeue_io_start_cut_in_line = 1; |
428870ff BB |
88 | |
89 | #ifdef ZFS_DEBUG | |
90 | int zio_buf_debug_limit = 16384; | |
91 | #else | |
92 | int zio_buf_debug_limit = 0; | |
93 | #endif | |
34dc7c2f | 94 | |
da6b4005 NB |
95 | static inline void __zio_execute(zio_t *zio); |
96 | ||
34dc7c2f BB |
97 | void |
98 | zio_init(void) | |
99 | { | |
100 | size_t c; | |
101 | vmem_t *data_alloc_arena = NULL; | |
102 | ||
3941503c BB |
103 | zio_cache = kmem_cache_create("zio_cache", |
104 | sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); | |
d164b209 | 105 | zio_link_cache = kmem_cache_create("zio_link_cache", |
6795a698 | 106 | sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); |
34dc7c2f BB |
107 | |
108 | /* | |
109 | * For small buffers, we want a cache for each multiple of | |
110 | * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache | |
111 | * for each quarter-power of 2. For large buffers, we want | |
112 | * a cache for each multiple of PAGESIZE. | |
113 | */ | |
114 | for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { | |
115 | size_t size = (c + 1) << SPA_MINBLOCKSHIFT; | |
116 | size_t p2 = size; | |
117 | size_t align = 0; | |
6442f3cf | 118 | size_t cflags = (size > zio_buf_debug_limit) ? KMC_NODEBUG : 0; |
34dc7c2f BB |
119 | |
120 | while (p2 & (p2 - 1)) | |
121 | p2 &= p2 - 1; | |
122 | ||
498877ba MA |
123 | #ifndef _KERNEL |
124 | /* | |
125 | * If we are using watchpoints, put each buffer on its own page, | |
126 | * to eliminate the performance overhead of trapping to the | |
127 | * kernel when modifying a non-watched buffer that shares the | |
128 | * page with a watched buffer. | |
129 | */ | |
130 | if (arc_watch && !IS_P2ALIGNED(size, PAGESIZE)) | |
131 | continue; | |
132 | #endif | |
34dc7c2f BB |
133 | if (size <= 4 * SPA_MINBLOCKSIZE) { |
134 | align = SPA_MINBLOCKSIZE; | |
498877ba | 135 | } else if (IS_P2ALIGNED(size, PAGESIZE)) { |
34dc7c2f | 136 | align = PAGESIZE; |
498877ba | 137 | } else if (IS_P2ALIGNED(size, p2 >> 2)) { |
34dc7c2f BB |
138 | align = p2 >> 2; |
139 | } | |
140 | ||
141 | if (align != 0) { | |
142 | char name[36]; | |
143 | (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); | |
144 | zio_buf_cache[c] = kmem_cache_create(name, size, | |
6442f3cf | 145 | align, NULL, NULL, NULL, NULL, NULL, cflags); |
34dc7c2f BB |
146 | |
147 | (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); | |
148 | zio_data_buf_cache[c] = kmem_cache_create(name, size, | |
ae6ba3db | 149 | align, NULL, NULL, NULL, NULL, |
6442f3cf | 150 | data_alloc_arena, cflags); |
34dc7c2f BB |
151 | } |
152 | } | |
153 | ||
154 | while (--c != 0) { | |
155 | ASSERT(zio_buf_cache[c] != NULL); | |
156 | if (zio_buf_cache[c - 1] == NULL) | |
157 | zio_buf_cache[c - 1] = zio_buf_cache[c]; | |
158 | ||
159 | ASSERT(zio_data_buf_cache[c] != NULL); | |
160 | if (zio_data_buf_cache[c - 1] == NULL) | |
161 | zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; | |
162 | } | |
163 | ||
34dc7c2f | 164 | zio_inject_init(); |
9759c60f ED |
165 | |
166 | lz4_init(); | |
34dc7c2f BB |
167 | } |
168 | ||
169 | void | |
170 | zio_fini(void) | |
171 | { | |
172 | size_t c; | |
173 | kmem_cache_t *last_cache = NULL; | |
174 | kmem_cache_t *last_data_cache = NULL; | |
175 | ||
176 | for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { | |
177 | if (zio_buf_cache[c] != last_cache) { | |
178 | last_cache = zio_buf_cache[c]; | |
179 | kmem_cache_destroy(zio_buf_cache[c]); | |
180 | } | |
181 | zio_buf_cache[c] = NULL; | |
182 | ||
183 | if (zio_data_buf_cache[c] != last_data_cache) { | |
184 | last_data_cache = zio_data_buf_cache[c]; | |
185 | kmem_cache_destroy(zio_data_buf_cache[c]); | |
186 | } | |
187 | zio_data_buf_cache[c] = NULL; | |
188 | } | |
189 | ||
d164b209 | 190 | kmem_cache_destroy(zio_link_cache); |
34dc7c2f BB |
191 | kmem_cache_destroy(zio_cache); |
192 | ||
193 | zio_inject_fini(); | |
9759c60f ED |
194 | |
195 | lz4_fini(); | |
34dc7c2f BB |
196 | } |
197 | ||
198 | /* | |
199 | * ========================================================================== | |
200 | * Allocate and free I/O buffers | |
201 | * ========================================================================== | |
202 | */ | |
203 | ||
204 | /* | |
205 | * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a | |
206 | * crashdump if the kernel panics, so use it judiciously. Obviously, it's | |
207 | * useful to inspect ZFS metadata, but if possible, we should avoid keeping | |
208 | * excess / transient data in-core during a crashdump. | |
209 | */ | |
210 | void * | |
211 | zio_buf_alloc(size_t size) | |
212 | { | |
213 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
214 | ||
9b67f605 | 215 | ASSERT3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); |
34dc7c2f | 216 | |
efcd79a8 | 217 | return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); |
34dc7c2f BB |
218 | } |
219 | ||
220 | /* | |
221 | * Use zio_data_buf_alloc to allocate data. The data will not appear in a | |
222 | * crashdump if the kernel panics. This exists so that we will limit the amount | |
223 | * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount | |
224 | * of kernel heap dumped to disk when the kernel panics) | |
225 | */ | |
226 | void * | |
227 | zio_data_buf_alloc(size_t size) | |
228 | { | |
229 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
230 | ||
231 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
232 | ||
efcd79a8 | 233 | return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); |
34dc7c2f BB |
234 | } |
235 | ||
236 | void | |
237 | zio_buf_free(void *buf, size_t size) | |
238 | { | |
239 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
240 | ||
241 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
242 | ||
243 | kmem_cache_free(zio_buf_cache[c], buf); | |
244 | } | |
245 | ||
246 | void | |
247 | zio_data_buf_free(void *buf, size_t size) | |
248 | { | |
249 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
250 | ||
251 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
252 | ||
253 | kmem_cache_free(zio_data_buf_cache[c], buf); | |
254 | } | |
255 | ||
256 | /* | |
257 | * ========================================================================== | |
258 | * Push and pop I/O transform buffers | |
259 | * ========================================================================== | |
260 | */ | |
261 | static void | |
b128c09f BB |
262 | zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, |
263 | zio_transform_func_t *transform) | |
34dc7c2f | 264 | { |
79c76d5b | 265 | zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); |
34dc7c2f | 266 | |
b128c09f BB |
267 | zt->zt_orig_data = zio->io_data; |
268 | zt->zt_orig_size = zio->io_size; | |
34dc7c2f | 269 | zt->zt_bufsize = bufsize; |
b128c09f | 270 | zt->zt_transform = transform; |
34dc7c2f BB |
271 | |
272 | zt->zt_next = zio->io_transform_stack; | |
273 | zio->io_transform_stack = zt; | |
274 | ||
275 | zio->io_data = data; | |
276 | zio->io_size = size; | |
277 | } | |
278 | ||
279 | static void | |
b128c09f | 280 | zio_pop_transforms(zio_t *zio) |
34dc7c2f | 281 | { |
b128c09f BB |
282 | zio_transform_t *zt; |
283 | ||
284 | while ((zt = zio->io_transform_stack) != NULL) { | |
285 | if (zt->zt_transform != NULL) | |
286 | zt->zt_transform(zio, | |
287 | zt->zt_orig_data, zt->zt_orig_size); | |
34dc7c2f | 288 | |
428870ff BB |
289 | if (zt->zt_bufsize != 0) |
290 | zio_buf_free(zio->io_data, zt->zt_bufsize); | |
34dc7c2f | 291 | |
b128c09f BB |
292 | zio->io_data = zt->zt_orig_data; |
293 | zio->io_size = zt->zt_orig_size; | |
294 | zio->io_transform_stack = zt->zt_next; | |
34dc7c2f | 295 | |
b128c09f | 296 | kmem_free(zt, sizeof (zio_transform_t)); |
34dc7c2f BB |
297 | } |
298 | } | |
299 | ||
b128c09f BB |
300 | /* |
301 | * ========================================================================== | |
302 | * I/O transform callbacks for subblocks and decompression | |
303 | * ========================================================================== | |
304 | */ | |
305 | static void | |
306 | zio_subblock(zio_t *zio, void *data, uint64_t size) | |
307 | { | |
308 | ASSERT(zio->io_size > size); | |
309 | ||
310 | if (zio->io_type == ZIO_TYPE_READ) | |
311 | bcopy(zio->io_data, data, size); | |
312 | } | |
313 | ||
314 | static void | |
315 | zio_decompress(zio_t *zio, void *data, uint64_t size) | |
316 | { | |
317 | if (zio->io_error == 0 && | |
318 | zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), | |
428870ff | 319 | zio->io_data, data, zio->io_size, size) != 0) |
2e528b49 | 320 | zio->io_error = SET_ERROR(EIO); |
b128c09f BB |
321 | } |
322 | ||
323 | /* | |
324 | * ========================================================================== | |
325 | * I/O parent/child relationships and pipeline interlocks | |
326 | * ========================================================================== | |
327 | */ | |
d164b209 BB |
328 | /* |
329 | * NOTE - Callers to zio_walk_parents() and zio_walk_children must | |
330 | * continue calling these functions until they return NULL. | |
331 | * Otherwise, the next caller will pick up the list walk in | |
332 | * some indeterminate state. (Otherwise every caller would | |
333 | * have to pass in a cookie to keep the state represented by | |
334 | * io_walk_link, which gets annoying.) | |
335 | */ | |
336 | zio_t * | |
337 | zio_walk_parents(zio_t *cio) | |
338 | { | |
339 | zio_link_t *zl = cio->io_walk_link; | |
340 | list_t *pl = &cio->io_parent_list; | |
b128c09f | 341 | |
d164b209 BB |
342 | zl = (zl == NULL) ? list_head(pl) : list_next(pl, zl); |
343 | cio->io_walk_link = zl; | |
344 | ||
345 | if (zl == NULL) | |
346 | return (NULL); | |
347 | ||
348 | ASSERT(zl->zl_child == cio); | |
349 | return (zl->zl_parent); | |
350 | } | |
351 | ||
352 | zio_t * | |
353 | zio_walk_children(zio_t *pio) | |
354 | { | |
355 | zio_link_t *zl = pio->io_walk_link; | |
356 | list_t *cl = &pio->io_child_list; | |
357 | ||
358 | zl = (zl == NULL) ? list_head(cl) : list_next(cl, zl); | |
359 | pio->io_walk_link = zl; | |
360 | ||
361 | if (zl == NULL) | |
362 | return (NULL); | |
363 | ||
364 | ASSERT(zl->zl_parent == pio); | |
365 | return (zl->zl_child); | |
366 | } | |
367 | ||
368 | zio_t * | |
369 | zio_unique_parent(zio_t *cio) | |
370 | { | |
371 | zio_t *pio = zio_walk_parents(cio); | |
372 | ||
373 | VERIFY(zio_walk_parents(cio) == NULL); | |
374 | return (pio); | |
375 | } | |
376 | ||
377 | void | |
378 | zio_add_child(zio_t *pio, zio_t *cio) | |
b128c09f | 379 | { |
79c76d5b | 380 | zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); |
d6320ddb | 381 | int w; |
d164b209 BB |
382 | |
383 | /* | |
384 | * Logical I/Os can have logical, gang, or vdev children. | |
385 | * Gang I/Os can have gang or vdev children. | |
386 | * Vdev I/Os can only have vdev children. | |
387 | * The following ASSERT captures all of these constraints. | |
388 | */ | |
389 | ASSERT(cio->io_child_type <= pio->io_child_type); | |
390 | ||
391 | zl->zl_parent = pio; | |
392 | zl->zl_child = cio; | |
393 | ||
394 | mutex_enter(&cio->io_lock); | |
b128c09f | 395 | mutex_enter(&pio->io_lock); |
d164b209 BB |
396 | |
397 | ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); | |
398 | ||
d6320ddb | 399 | for (w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 BB |
400 | pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; |
401 | ||
402 | list_insert_head(&pio->io_child_list, zl); | |
403 | list_insert_head(&cio->io_parent_list, zl); | |
404 | ||
428870ff BB |
405 | pio->io_child_count++; |
406 | cio->io_parent_count++; | |
407 | ||
b128c09f | 408 | mutex_exit(&pio->io_lock); |
d164b209 | 409 | mutex_exit(&cio->io_lock); |
b128c09f BB |
410 | } |
411 | ||
34dc7c2f | 412 | static void |
d164b209 | 413 | zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) |
b128c09f | 414 | { |
d164b209 BB |
415 | ASSERT(zl->zl_parent == pio); |
416 | ASSERT(zl->zl_child == cio); | |
b128c09f | 417 | |
d164b209 | 418 | mutex_enter(&cio->io_lock); |
b128c09f | 419 | mutex_enter(&pio->io_lock); |
d164b209 BB |
420 | |
421 | list_remove(&pio->io_child_list, zl); | |
422 | list_remove(&cio->io_parent_list, zl); | |
423 | ||
428870ff BB |
424 | pio->io_child_count--; |
425 | cio->io_parent_count--; | |
426 | ||
b128c09f | 427 | mutex_exit(&pio->io_lock); |
d164b209 BB |
428 | mutex_exit(&cio->io_lock); |
429 | ||
430 | kmem_cache_free(zio_link_cache, zl); | |
b128c09f BB |
431 | } |
432 | ||
433 | static boolean_t | |
434 | zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) | |
34dc7c2f | 435 | { |
b128c09f BB |
436 | uint64_t *countp = &zio->io_children[child][wait]; |
437 | boolean_t waiting = B_FALSE; | |
438 | ||
439 | mutex_enter(&zio->io_lock); | |
440 | ASSERT(zio->io_stall == NULL); | |
441 | if (*countp != 0) { | |
428870ff | 442 | zio->io_stage >>= 1; |
b128c09f BB |
443 | zio->io_stall = countp; |
444 | waiting = B_TRUE; | |
445 | } | |
446 | mutex_exit(&zio->io_lock); | |
447 | ||
448 | return (waiting); | |
449 | } | |
34dc7c2f | 450 | |
bf701a83 BB |
451 | __attribute__((always_inline)) |
452 | static inline void | |
b128c09f BB |
453 | zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) |
454 | { | |
455 | uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; | |
456 | int *errorp = &pio->io_child_error[zio->io_child_type]; | |
34dc7c2f | 457 | |
b128c09f BB |
458 | mutex_enter(&pio->io_lock); |
459 | if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) | |
460 | *errorp = zio_worst_error(*errorp, zio->io_error); | |
461 | pio->io_reexecute |= zio->io_reexecute; | |
462 | ASSERT3U(*countp, >, 0); | |
e8b96c60 MA |
463 | |
464 | (*countp)--; | |
465 | ||
466 | if (*countp == 0 && pio->io_stall == countp) { | |
b128c09f BB |
467 | pio->io_stall = NULL; |
468 | mutex_exit(&pio->io_lock); | |
da6b4005 | 469 | __zio_execute(pio); |
b128c09f BB |
470 | } else { |
471 | mutex_exit(&pio->io_lock); | |
34dc7c2f BB |
472 | } |
473 | } | |
474 | ||
b128c09f BB |
475 | static void |
476 | zio_inherit_child_errors(zio_t *zio, enum zio_child c) | |
477 | { | |
478 | if (zio->io_child_error[c] != 0 && zio->io_error == 0) | |
479 | zio->io_error = zio->io_child_error[c]; | |
480 | } | |
481 | ||
34dc7c2f BB |
482 | /* |
483 | * ========================================================================== | |
b128c09f | 484 | * Create the various types of I/O (read, write, free, etc) |
34dc7c2f BB |
485 | * ========================================================================== |
486 | */ | |
487 | static zio_t * | |
428870ff | 488 | zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
34dc7c2f | 489 | void *data, uint64_t size, zio_done_func_t *done, void *private, |
e8b96c60 | 490 | zio_type_t type, zio_priority_t priority, enum zio_flag flags, |
5dbd68a3 | 491 | vdev_t *vd, uint64_t offset, const zbookmark_phys_t *zb, |
428870ff | 492 | enum zio_stage stage, enum zio_stage pipeline) |
34dc7c2f BB |
493 | { |
494 | zio_t *zio; | |
495 | ||
496 | ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); | |
497 | ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); | |
b128c09f BB |
498 | ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); |
499 | ||
500 | ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); | |
501 | ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); | |
502 | ASSERT(vd || stage == ZIO_STAGE_OPEN); | |
34dc7c2f | 503 | |
79c76d5b | 504 | zio = kmem_cache_alloc(zio_cache, KM_SLEEP); |
3941503c BB |
505 | bzero(zio, sizeof (zio_t)); |
506 | ||
507 | mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); | |
508 | cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); | |
509 | ||
510 | list_create(&zio->io_parent_list, sizeof (zio_link_t), | |
511 | offsetof(zio_link_t, zl_parent_node)); | |
512 | list_create(&zio->io_child_list, sizeof (zio_link_t), | |
513 | offsetof(zio_link_t, zl_child_node)); | |
d164b209 | 514 | |
b128c09f BB |
515 | if (vd != NULL) |
516 | zio->io_child_type = ZIO_CHILD_VDEV; | |
517 | else if (flags & ZIO_FLAG_GANG_CHILD) | |
518 | zio->io_child_type = ZIO_CHILD_GANG; | |
428870ff BB |
519 | else if (flags & ZIO_FLAG_DDT_CHILD) |
520 | zio->io_child_type = ZIO_CHILD_DDT; | |
b128c09f BB |
521 | else |
522 | zio->io_child_type = ZIO_CHILD_LOGICAL; | |
523 | ||
34dc7c2f | 524 | if (bp != NULL) { |
428870ff | 525 | zio->io_bp = (blkptr_t *)bp; |
34dc7c2f BB |
526 | zio->io_bp_copy = *bp; |
527 | zio->io_bp_orig = *bp; | |
428870ff BB |
528 | if (type != ZIO_TYPE_WRITE || |
529 | zio->io_child_type == ZIO_CHILD_DDT) | |
b128c09f | 530 | zio->io_bp = &zio->io_bp_copy; /* so caller can free */ |
9babb374 | 531 | if (zio->io_child_type == ZIO_CHILD_LOGICAL) |
b128c09f | 532 | zio->io_logical = zio; |
9babb374 BB |
533 | if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) |
534 | pipeline |= ZIO_GANG_STAGES; | |
34dc7c2f | 535 | } |
b128c09f BB |
536 | |
537 | zio->io_spa = spa; | |
538 | zio->io_txg = txg; | |
34dc7c2f BB |
539 | zio->io_done = done; |
540 | zio->io_private = private; | |
541 | zio->io_type = type; | |
542 | zio->io_priority = priority; | |
b128c09f BB |
543 | zio->io_vd = vd; |
544 | zio->io_offset = offset; | |
428870ff BB |
545 | zio->io_orig_data = zio->io_data = data; |
546 | zio->io_orig_size = zio->io_size = size; | |
b128c09f BB |
547 | zio->io_orig_flags = zio->io_flags = flags; |
548 | zio->io_orig_stage = zio->io_stage = stage; | |
549 | zio->io_orig_pipeline = zio->io_pipeline = pipeline; | |
34dc7c2f | 550 | |
d164b209 BB |
551 | zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); |
552 | zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); | |
553 | ||
b128c09f BB |
554 | if (zb != NULL) |
555 | zio->io_bookmark = *zb; | |
556 | ||
557 | if (pio != NULL) { | |
b128c09f | 558 | if (zio->io_logical == NULL) |
34dc7c2f | 559 | zio->io_logical = pio->io_logical; |
9babb374 BB |
560 | if (zio->io_child_type == ZIO_CHILD_GANG) |
561 | zio->io_gang_leader = pio->io_gang_leader; | |
b128c09f | 562 | zio_add_child(pio, zio); |
34dc7c2f BB |
563 | } |
564 | ||
a38718a6 GA |
565 | taskq_init_ent(&zio->io_tqent); |
566 | ||
34dc7c2f BB |
567 | return (zio); |
568 | } | |
569 | ||
570 | static void | |
b128c09f | 571 | zio_destroy(zio_t *zio) |
34dc7c2f | 572 | { |
3941503c BB |
573 | list_destroy(&zio->io_parent_list); |
574 | list_destroy(&zio->io_child_list); | |
575 | mutex_destroy(&zio->io_lock); | |
576 | cv_destroy(&zio->io_cv); | |
b128c09f | 577 | kmem_cache_free(zio_cache, zio); |
34dc7c2f BB |
578 | } |
579 | ||
580 | zio_t * | |
d164b209 | 581 | zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, |
428870ff | 582 | void *private, enum zio_flag flags) |
34dc7c2f BB |
583 | { |
584 | zio_t *zio; | |
585 | ||
586 | zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, | |
d164b209 | 587 | ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, |
b128c09f | 588 | ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); |
34dc7c2f BB |
589 | |
590 | return (zio); | |
591 | } | |
592 | ||
593 | zio_t * | |
428870ff | 594 | zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) |
34dc7c2f | 595 | { |
d164b209 | 596 | return (zio_null(NULL, spa, NULL, done, private, flags)); |
34dc7c2f BB |
597 | } |
598 | ||
599 | zio_t * | |
b128c09f BB |
600 | zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, |
601 | void *data, uint64_t size, zio_done_func_t *done, void *private, | |
5dbd68a3 | 602 | zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb) |
34dc7c2f BB |
603 | { |
604 | zio_t *zio; | |
605 | ||
428870ff | 606 | zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, |
b128c09f BB |
607 | data, size, done, private, |
608 | ZIO_TYPE_READ, priority, flags, NULL, 0, zb, | |
428870ff BB |
609 | ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? |
610 | ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); | |
34dc7c2f | 611 | |
b128c09f BB |
612 | return (zio); |
613 | } | |
34dc7c2f | 614 | |
34dc7c2f | 615 | zio_t * |
b128c09f | 616 | zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, |
428870ff | 617 | void *data, uint64_t size, const zio_prop_t *zp, |
e8b96c60 MA |
618 | zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done, |
619 | void *private, | |
5dbd68a3 | 620 | zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb) |
34dc7c2f BB |
621 | { |
622 | zio_t *zio; | |
623 | ||
b128c09f BB |
624 | ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && |
625 | zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && | |
626 | zp->zp_compress >= ZIO_COMPRESS_OFF && | |
627 | zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && | |
9ae529ec | 628 | DMU_OT_IS_VALID(zp->zp_type) && |
b128c09f | 629 | zp->zp_level < 32 && |
428870ff | 630 | zp->zp_copies > 0 && |
03c6040b | 631 | zp->zp_copies <= spa_max_replication(spa)); |
34dc7c2f BB |
632 | |
633 | zio = zio_create(pio, spa, txg, bp, data, size, done, private, | |
b128c09f | 634 | ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, |
428870ff BB |
635 | ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? |
636 | ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); | |
34dc7c2f BB |
637 | |
638 | zio->io_ready = ready; | |
e8b96c60 | 639 | zio->io_physdone = physdone; |
b128c09f | 640 | zio->io_prop = *zp; |
34dc7c2f | 641 | |
9b67f605 MA |
642 | /* |
643 | * Data can be NULL if we are going to call zio_write_override() to | |
644 | * provide the already-allocated BP. But we may need the data to | |
645 | * verify a dedup hit (if requested). In this case, don't try to | |
646 | * dedup (just take the already-allocated BP verbatim). | |
647 | */ | |
648 | if (data == NULL && zio->io_prop.zp_dedup_verify) { | |
649 | zio->io_prop.zp_dedup = zio->io_prop.zp_dedup_verify = B_FALSE; | |
650 | } | |
651 | ||
34dc7c2f BB |
652 | return (zio); |
653 | } | |
654 | ||
655 | zio_t * | |
b128c09f | 656 | zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, |
e8b96c60 | 657 | uint64_t size, zio_done_func_t *done, void *private, |
5dbd68a3 | 658 | zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb) |
34dc7c2f BB |
659 | { |
660 | zio_t *zio; | |
661 | ||
34dc7c2f | 662 | zio = zio_create(pio, spa, txg, bp, data, size, done, private, |
b128c09f BB |
663 | ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, |
664 | ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); | |
34dc7c2f BB |
665 | |
666 | return (zio); | |
667 | } | |
668 | ||
428870ff | 669 | void |
03c6040b | 670 | zio_write_override(zio_t *zio, blkptr_t *bp, int copies, boolean_t nopwrite) |
428870ff BB |
671 | { |
672 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); | |
673 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
674 | ASSERT(zio->io_stage == ZIO_STAGE_OPEN); | |
675 | ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); | |
676 | ||
03c6040b GW |
677 | /* |
678 | * We must reset the io_prop to match the values that existed | |
679 | * when the bp was first written by dmu_sync() keeping in mind | |
680 | * that nopwrite and dedup are mutually exclusive. | |
681 | */ | |
682 | zio->io_prop.zp_dedup = nopwrite ? B_FALSE : zio->io_prop.zp_dedup; | |
683 | zio->io_prop.zp_nopwrite = nopwrite; | |
428870ff BB |
684 | zio->io_prop.zp_copies = copies; |
685 | zio->io_bp_override = bp; | |
686 | } | |
687 | ||
688 | void | |
689 | zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) | |
690 | { | |
9b67f605 MA |
691 | |
692 | /* | |
693 | * The check for EMBEDDED is a performance optimization. We | |
694 | * process the free here (by ignoring it) rather than | |
695 | * putting it on the list and then processing it in zio_free_sync(). | |
696 | */ | |
697 | if (BP_IS_EMBEDDED(bp)) | |
698 | return; | |
13fe0198 | 699 | metaslab_check_free(spa, bp); |
2883cad5 MA |
700 | |
701 | /* | |
702 | * Frees that are for the currently-syncing txg, are not going to be | |
703 | * deferred, and which will not need to do a read (i.e. not GANG or | |
704 | * DEDUP), can be processed immediately. Otherwise, put them on the | |
705 | * in-memory list for later processing. | |
706 | */ | |
707 | if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp) || | |
708 | txg != spa->spa_syncing_txg || | |
709 | spa_sync_pass(spa) >= zfs_sync_pass_deferred_free) { | |
710 | bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp); | |
711 | } else { | |
712 | VERIFY0(zio_wait(zio_free_sync(NULL, spa, txg, bp, 0))); | |
713 | } | |
428870ff BB |
714 | } |
715 | ||
34dc7c2f | 716 | zio_t * |
428870ff BB |
717 | zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
718 | enum zio_flag flags) | |
34dc7c2f BB |
719 | { |
720 | zio_t *zio; | |
2883cad5 | 721 | enum zio_stage stage = ZIO_FREE_PIPELINE; |
34dc7c2f | 722 | |
428870ff BB |
723 | ASSERT(!BP_IS_HOLE(bp)); |
724 | ASSERT(spa_syncing_txg(spa) == txg); | |
55d85d5a | 725 | ASSERT(spa_sync_pass(spa) < zfs_sync_pass_deferred_free); |
34dc7c2f | 726 | |
9b67f605 MA |
727 | if (BP_IS_EMBEDDED(bp)) |
728 | return (zio_null(pio, spa, NULL, NULL, NULL, 0)); | |
729 | ||
13fe0198 | 730 | metaslab_check_free(spa, bp); |
8c841793 | 731 | arc_freed(spa, bp); |
13fe0198 | 732 | |
2883cad5 MA |
733 | /* |
734 | * GANG and DEDUP blocks can induce a read (for the gang block header, | |
735 | * or the DDT), so issue them asynchronously so that this thread is | |
736 | * not tied up. | |
737 | */ | |
738 | if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp)) | |
739 | stage |= ZIO_STAGE_ISSUE_ASYNC; | |
740 | ||
b128c09f | 741 | zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), |
2883cad5 MA |
742 | NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_NOW, flags, |
743 | NULL, 0, NULL, ZIO_STAGE_OPEN, stage); | |
744 | ||
34dc7c2f BB |
745 | return (zio); |
746 | } | |
747 | ||
748 | zio_t * | |
428870ff BB |
749 | zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
750 | zio_done_func_t *done, void *private, enum zio_flag flags) | |
34dc7c2f BB |
751 | { |
752 | zio_t *zio; | |
753 | ||
9b67f605 MA |
754 | dprintf_bp(bp, "claiming in txg %llu", txg); |
755 | ||
756 | if (BP_IS_EMBEDDED(bp)) | |
757 | return (zio_null(pio, spa, NULL, NULL, NULL, 0)); | |
758 | ||
34dc7c2f BB |
759 | /* |
760 | * A claim is an allocation of a specific block. Claims are needed | |
761 | * to support immediate writes in the intent log. The issue is that | |
762 | * immediate writes contain committed data, but in a txg that was | |
763 | * *not* committed. Upon opening the pool after an unclean shutdown, | |
764 | * the intent log claims all blocks that contain immediate write data | |
765 | * so that the SPA knows they're in use. | |
766 | * | |
767 | * All claims *must* be resolved in the first txg -- before the SPA | |
768 | * starts allocating blocks -- so that nothing is allocated twice. | |
428870ff | 769 | * If txg == 0 we just verify that the block is claimable. |
34dc7c2f BB |
770 | */ |
771 | ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); | |
428870ff BB |
772 | ASSERT(txg == spa_first_txg(spa) || txg == 0); |
773 | ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ | |
34dc7c2f | 774 | |
b128c09f BB |
775 | zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), |
776 | done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, | |
777 | NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); | |
34dc7c2f BB |
778 | |
779 | return (zio); | |
780 | } | |
781 | ||
782 | zio_t * | |
783 | zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, | |
e8b96c60 | 784 | zio_done_func_t *done, void *private, enum zio_flag flags) |
34dc7c2f BB |
785 | { |
786 | zio_t *zio; | |
787 | int c; | |
788 | ||
789 | if (vd->vdev_children == 0) { | |
790 | zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, | |
e8b96c60 | 791 | ZIO_TYPE_IOCTL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, |
34dc7c2f BB |
792 | ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); |
793 | ||
34dc7c2f BB |
794 | zio->io_cmd = cmd; |
795 | } else { | |
d164b209 | 796 | zio = zio_null(pio, spa, NULL, NULL, NULL, flags); |
34dc7c2f BB |
797 | |
798 | for (c = 0; c < vd->vdev_children; c++) | |
799 | zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, | |
e8b96c60 | 800 | done, private, flags)); |
34dc7c2f BB |
801 | } |
802 | ||
803 | return (zio); | |
804 | } | |
805 | ||
34dc7c2f BB |
806 | zio_t * |
807 | zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, | |
808 | void *data, int checksum, zio_done_func_t *done, void *private, | |
e8b96c60 | 809 | zio_priority_t priority, enum zio_flag flags, boolean_t labels) |
34dc7c2f BB |
810 | { |
811 | zio_t *zio; | |
34dc7c2f | 812 | |
b128c09f BB |
813 | ASSERT(vd->vdev_children == 0); |
814 | ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || | |
815 | offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); | |
816 | ASSERT3U(offset + size, <=, vd->vdev_psize); | |
34dc7c2f | 817 | |
b128c09f | 818 | zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, |
b02fe35d AR |
819 | ZIO_TYPE_READ, priority, flags | ZIO_FLAG_PHYSICAL, vd, offset, |
820 | NULL, ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); | |
34dc7c2f | 821 | |
b128c09f | 822 | zio->io_prop.zp_checksum = checksum; |
34dc7c2f BB |
823 | |
824 | return (zio); | |
825 | } | |
826 | ||
827 | zio_t * | |
828 | zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, | |
829 | void *data, int checksum, zio_done_func_t *done, void *private, | |
e8b96c60 | 830 | zio_priority_t priority, enum zio_flag flags, boolean_t labels) |
34dc7c2f | 831 | { |
34dc7c2f | 832 | zio_t *zio; |
34dc7c2f | 833 | |
b128c09f BB |
834 | ASSERT(vd->vdev_children == 0); |
835 | ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || | |
836 | offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); | |
837 | ASSERT3U(offset + size, <=, vd->vdev_psize); | |
34dc7c2f | 838 | |
b128c09f | 839 | zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, |
b02fe35d AR |
840 | ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_PHYSICAL, vd, offset, |
841 | NULL, ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); | |
34dc7c2f | 842 | |
b128c09f | 843 | zio->io_prop.zp_checksum = checksum; |
34dc7c2f | 844 | |
428870ff | 845 | if (zio_checksum_table[checksum].ci_eck) { |
34dc7c2f | 846 | /* |
428870ff | 847 | * zec checksums are necessarily destructive -- they modify |
b128c09f | 848 | * the end of the write buffer to hold the verifier/checksum. |
34dc7c2f | 849 | * Therefore, we must make a local copy in case the data is |
b128c09f | 850 | * being written to multiple places in parallel. |
34dc7c2f | 851 | */ |
b128c09f | 852 | void *wbuf = zio_buf_alloc(size); |
34dc7c2f | 853 | bcopy(data, wbuf, size); |
b128c09f | 854 | zio_push_transform(zio, wbuf, size, size, NULL); |
34dc7c2f BB |
855 | } |
856 | ||
857 | return (zio); | |
858 | } | |
859 | ||
860 | /* | |
b128c09f | 861 | * Create a child I/O to do some work for us. |
34dc7c2f BB |
862 | */ |
863 | zio_t * | |
b128c09f | 864 | zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, |
e8b96c60 MA |
865 | void *data, uint64_t size, int type, zio_priority_t priority, |
866 | enum zio_flag flags, zio_done_func_t *done, void *private) | |
34dc7c2f | 867 | { |
428870ff | 868 | enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; |
b128c09f BB |
869 | zio_t *zio; |
870 | ||
871 | ASSERT(vd->vdev_parent == | |
872 | (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); | |
34dc7c2f BB |
873 | |
874 | if (type == ZIO_TYPE_READ && bp != NULL) { | |
875 | /* | |
876 | * If we have the bp, then the child should perform the | |
877 | * checksum and the parent need not. This pushes error | |
878 | * detection as close to the leaves as possible and | |
879 | * eliminates redundant checksums in the interior nodes. | |
880 | */ | |
428870ff BB |
881 | pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; |
882 | pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; | |
34dc7c2f BB |
883 | } |
884 | ||
b128c09f BB |
885 | if (vd->vdev_children == 0) |
886 | offset += VDEV_LABEL_START_SIZE; | |
887 | ||
428870ff BB |
888 | flags |= ZIO_VDEV_CHILD_FLAGS(pio) | ZIO_FLAG_DONT_PROPAGATE; |
889 | ||
890 | /* | |
891 | * If we've decided to do a repair, the write is not speculative -- | |
892 | * even if the original read was. | |
893 | */ | |
894 | if (flags & ZIO_FLAG_IO_REPAIR) | |
895 | flags &= ~ZIO_FLAG_SPECULATIVE; | |
896 | ||
b128c09f | 897 | zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, |
428870ff BB |
898 | done, private, type, priority, flags, vd, offset, &pio->io_bookmark, |
899 | ZIO_STAGE_VDEV_IO_START >> 1, pipeline); | |
34dc7c2f | 900 | |
e8b96c60 MA |
901 | zio->io_physdone = pio->io_physdone; |
902 | if (vd->vdev_ops->vdev_op_leaf && zio->io_logical != NULL) | |
903 | zio->io_logical->io_phys_children++; | |
904 | ||
b128c09f | 905 | return (zio); |
34dc7c2f BB |
906 | } |
907 | ||
b128c09f BB |
908 | zio_t * |
909 | zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, | |
e8b96c60 | 910 | int type, zio_priority_t priority, enum zio_flag flags, |
428870ff | 911 | zio_done_func_t *done, void *private) |
34dc7c2f | 912 | { |
b128c09f | 913 | zio_t *zio; |
34dc7c2f | 914 | |
b128c09f | 915 | ASSERT(vd->vdev_ops->vdev_op_leaf); |
34dc7c2f | 916 | |
b128c09f BB |
917 | zio = zio_create(NULL, vd->vdev_spa, 0, NULL, |
918 | data, size, done, private, type, priority, | |
e8b96c60 | 919 | flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY | ZIO_FLAG_DELEGATED, |
b128c09f | 920 | vd, offset, NULL, |
428870ff | 921 | ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); |
34dc7c2f | 922 | |
b128c09f | 923 | return (zio); |
34dc7c2f BB |
924 | } |
925 | ||
926 | void | |
b128c09f | 927 | zio_flush(zio_t *zio, vdev_t *vd) |
34dc7c2f | 928 | { |
b128c09f | 929 | zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, |
e8b96c60 | 930 | NULL, NULL, |
b128c09f | 931 | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); |
34dc7c2f BB |
932 | } |
933 | ||
428870ff BB |
934 | void |
935 | zio_shrink(zio_t *zio, uint64_t size) | |
936 | { | |
937 | ASSERT(zio->io_executor == NULL); | |
938 | ASSERT(zio->io_orig_size == zio->io_size); | |
939 | ASSERT(size <= zio->io_size); | |
940 | ||
941 | /* | |
942 | * We don't shrink for raidz because of problems with the | |
943 | * reconstruction when reading back less than the block size. | |
944 | * Note, BP_IS_RAIDZ() assumes no compression. | |
945 | */ | |
946 | ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); | |
947 | if (!BP_IS_RAIDZ(zio->io_bp)) | |
948 | zio->io_orig_size = zio->io_size = size; | |
949 | } | |
950 | ||
34dc7c2f BB |
951 | /* |
952 | * ========================================================================== | |
b128c09f | 953 | * Prepare to read and write logical blocks |
34dc7c2f BB |
954 | * ========================================================================== |
955 | */ | |
b128c09f | 956 | |
34dc7c2f | 957 | static int |
b128c09f | 958 | zio_read_bp_init(zio_t *zio) |
34dc7c2f | 959 | { |
b128c09f | 960 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 961 | |
fb5f0bc8 | 962 | if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && |
9babb374 BB |
963 | zio->io_child_type == ZIO_CHILD_LOGICAL && |
964 | !(zio->io_flags & ZIO_FLAG_RAW)) { | |
9b67f605 MA |
965 | uint64_t psize = |
966 | BP_IS_EMBEDDED(bp) ? BPE_GET_PSIZE(bp) : BP_GET_PSIZE(bp); | |
428870ff | 967 | void *cbuf = zio_buf_alloc(psize); |
b128c09f | 968 | |
428870ff | 969 | zio_push_transform(zio, cbuf, psize, psize, zio_decompress); |
34dc7c2f | 970 | } |
34dc7c2f | 971 | |
9b67f605 MA |
972 | if (BP_IS_EMBEDDED(bp) && BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA) { |
973 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
974 | decode_embedded_bp_compressed(bp, zio->io_data); | |
975 | } else { | |
976 | ASSERT(!BP_IS_EMBEDDED(bp)); | |
977 | } | |
978 | ||
9ae529ec | 979 | if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) && BP_GET_LEVEL(bp) == 0) |
b128c09f BB |
980 | zio->io_flags |= ZIO_FLAG_DONT_CACHE; |
981 | ||
428870ff BB |
982 | if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) |
983 | zio->io_flags |= ZIO_FLAG_DONT_CACHE; | |
984 | ||
985 | if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) | |
986 | zio->io_pipeline = ZIO_DDT_READ_PIPELINE; | |
987 | ||
b128c09f | 988 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
989 | } |
990 | ||
b128c09f BB |
991 | static int |
992 | zio_write_bp_init(zio_t *zio) | |
34dc7c2f | 993 | { |
428870ff | 994 | spa_t *spa = zio->io_spa; |
b128c09f | 995 | zio_prop_t *zp = &zio->io_prop; |
428870ff | 996 | enum zio_compress compress = zp->zp_compress; |
34dc7c2f | 997 | blkptr_t *bp = zio->io_bp; |
b128c09f | 998 | uint64_t lsize = zio->io_size; |
428870ff | 999 | uint64_t psize = lsize; |
b128c09f | 1000 | int pass = 1; |
34dc7c2f | 1001 | |
b128c09f BB |
1002 | /* |
1003 | * If our children haven't all reached the ready stage, | |
1004 | * wait for them and then repeat this pipeline stage. | |
1005 | */ | |
1006 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || | |
1007 | zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) | |
1008 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 1009 | |
b128c09f BB |
1010 | if (!IO_IS_ALLOCATING(zio)) |
1011 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f | 1012 | |
428870ff BB |
1013 | ASSERT(zio->io_child_type != ZIO_CHILD_DDT); |
1014 | ||
1015 | if (zio->io_bp_override) { | |
1016 | ASSERT(bp->blk_birth != zio->io_txg); | |
1017 | ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); | |
1018 | ||
1019 | *bp = *zio->io_bp_override; | |
1020 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
1021 | ||
9b67f605 MA |
1022 | if (BP_IS_EMBEDDED(bp)) |
1023 | return (ZIO_PIPELINE_CONTINUE); | |
1024 | ||
03c6040b GW |
1025 | /* |
1026 | * If we've been overridden and nopwrite is set then | |
1027 | * set the flag accordingly to indicate that a nopwrite | |
1028 | * has already occurred. | |
1029 | */ | |
1030 | if (!BP_IS_HOLE(bp) && zp->zp_nopwrite) { | |
1031 | ASSERT(!zp->zp_dedup); | |
1032 | zio->io_flags |= ZIO_FLAG_NOPWRITE; | |
1033 | return (ZIO_PIPELINE_CONTINUE); | |
1034 | } | |
1035 | ||
1036 | ASSERT(!zp->zp_nopwrite); | |
1037 | ||
428870ff BB |
1038 | if (BP_IS_HOLE(bp) || !zp->zp_dedup) |
1039 | return (ZIO_PIPELINE_CONTINUE); | |
1040 | ||
1041 | ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup || | |
1042 | zp->zp_dedup_verify); | |
1043 | ||
1044 | if (BP_GET_CHECKSUM(bp) == zp->zp_checksum) { | |
1045 | BP_SET_DEDUP(bp, 1); | |
1046 | zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; | |
1047 | return (ZIO_PIPELINE_CONTINUE); | |
1048 | } | |
428870ff | 1049 | } |
34dc7c2f | 1050 | |
b0bc7a84 | 1051 | if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg) { |
b128c09f BB |
1052 | /* |
1053 | * We're rewriting an existing block, which means we're | |
1054 | * working on behalf of spa_sync(). For spa_sync() to | |
1055 | * converge, it must eventually be the case that we don't | |
1056 | * have to allocate new blocks. But compression changes | |
1057 | * the blocksize, which forces a reallocate, and makes | |
1058 | * convergence take longer. Therefore, after the first | |
1059 | * few passes, stop compressing to ensure convergence. | |
1060 | */ | |
428870ff BB |
1061 | pass = spa_sync_pass(spa); |
1062 | ||
1063 | ASSERT(zio->io_txg == spa_syncing_txg(spa)); | |
1064 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1065 | ASSERT(!BP_GET_DEDUP(bp)); | |
34dc7c2f | 1066 | |
55d85d5a | 1067 | if (pass >= zfs_sync_pass_dont_compress) |
b128c09f | 1068 | compress = ZIO_COMPRESS_OFF; |
34dc7c2f | 1069 | |
b128c09f | 1070 | /* Make sure someone doesn't change their mind on overwrites */ |
9b67f605 | 1071 | ASSERT(BP_IS_EMBEDDED(bp) || MIN(zp->zp_copies + BP_IS_GANG(bp), |
428870ff | 1072 | spa_max_replication(spa)) == BP_GET_NDVAS(bp)); |
b128c09f | 1073 | } |
34dc7c2f | 1074 | |
b128c09f | 1075 | if (compress != ZIO_COMPRESS_OFF) { |
428870ff BB |
1076 | void *cbuf = zio_buf_alloc(lsize); |
1077 | psize = zio_compress_data(compress, zio->io_data, cbuf, lsize); | |
1078 | if (psize == 0 || psize == lsize) { | |
b128c09f | 1079 | compress = ZIO_COMPRESS_OFF; |
428870ff | 1080 | zio_buf_free(cbuf, lsize); |
9b67f605 MA |
1081 | } else if (!zp->zp_dedup && psize <= BPE_PAYLOAD_SIZE && |
1082 | zp->zp_level == 0 && !DMU_OT_HAS_FILL(zp->zp_type) && | |
1083 | spa_feature_is_enabled(spa, SPA_FEATURE_EMBEDDED_DATA)) { | |
1084 | encode_embedded_bp_compressed(bp, | |
1085 | cbuf, compress, lsize, psize); | |
1086 | BPE_SET_ETYPE(bp, BP_EMBEDDED_TYPE_DATA); | |
1087 | BP_SET_TYPE(bp, zio->io_prop.zp_type); | |
1088 | BP_SET_LEVEL(bp, zio->io_prop.zp_level); | |
1089 | zio_buf_free(cbuf, lsize); | |
1090 | bp->blk_birth = zio->io_txg; | |
1091 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
1092 | ASSERT(spa_feature_is_active(spa, | |
1093 | SPA_FEATURE_EMBEDDED_DATA)); | |
1094 | return (ZIO_PIPELINE_CONTINUE); | |
428870ff | 1095 | } else { |
9b67f605 MA |
1096 | /* |
1097 | * Round up compressed size to MINBLOCKSIZE and | |
1098 | * zero the tail. | |
1099 | */ | |
1100 | size_t rounded = | |
1101 | P2ROUNDUP(psize, (size_t)SPA_MINBLOCKSIZE); | |
1102 | if (rounded > psize) { | |
1103 | bzero((char *)cbuf + psize, rounded - psize); | |
1104 | psize = rounded; | |
1105 | } | |
1106 | if (psize == lsize) { | |
1107 | compress = ZIO_COMPRESS_OFF; | |
1108 | zio_buf_free(cbuf, lsize); | |
1109 | } else { | |
1110 | zio_push_transform(zio, cbuf, | |
1111 | psize, lsize, NULL); | |
1112 | } | |
b128c09f BB |
1113 | } |
1114 | } | |
34dc7c2f | 1115 | |
b128c09f BB |
1116 | /* |
1117 | * The final pass of spa_sync() must be all rewrites, but the first | |
1118 | * few passes offer a trade-off: allocating blocks defers convergence, | |
1119 | * but newly allocated blocks are sequential, so they can be written | |
1120 | * to disk faster. Therefore, we allow the first few passes of | |
1121 | * spa_sync() to allocate new blocks, but force rewrites after that. | |
1122 | * There should only be a handful of blocks after pass 1 in any case. | |
1123 | */ | |
b0bc7a84 MG |
1124 | if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg && |
1125 | BP_GET_PSIZE(bp) == psize && | |
55d85d5a | 1126 | pass >= zfs_sync_pass_rewrite) { |
428870ff | 1127 | enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; |
d6320ddb | 1128 | ASSERT(psize != 0); |
b128c09f BB |
1129 | zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; |
1130 | zio->io_flags |= ZIO_FLAG_IO_REWRITE; | |
1131 | } else { | |
1132 | BP_ZERO(bp); | |
1133 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
1134 | } | |
34dc7c2f | 1135 | |
428870ff | 1136 | if (psize == 0) { |
b0bc7a84 MG |
1137 | if (zio->io_bp_orig.blk_birth != 0 && |
1138 | spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { | |
1139 | BP_SET_LSIZE(bp, lsize); | |
1140 | BP_SET_TYPE(bp, zp->zp_type); | |
1141 | BP_SET_LEVEL(bp, zp->zp_level); | |
1142 | BP_SET_BIRTH(bp, zio->io_txg, 0); | |
1143 | } | |
b128c09f BB |
1144 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
1145 | } else { | |
1146 | ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); | |
1147 | BP_SET_LSIZE(bp, lsize); | |
b0bc7a84 MG |
1148 | BP_SET_TYPE(bp, zp->zp_type); |
1149 | BP_SET_LEVEL(bp, zp->zp_level); | |
428870ff | 1150 | BP_SET_PSIZE(bp, psize); |
b128c09f BB |
1151 | BP_SET_COMPRESS(bp, compress); |
1152 | BP_SET_CHECKSUM(bp, zp->zp_checksum); | |
428870ff | 1153 | BP_SET_DEDUP(bp, zp->zp_dedup); |
b128c09f | 1154 | BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); |
428870ff BB |
1155 | if (zp->zp_dedup) { |
1156 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1157 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); | |
1158 | zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; | |
1159 | } | |
03c6040b GW |
1160 | if (zp->zp_nopwrite) { |
1161 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1162 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); | |
1163 | zio->io_pipeline |= ZIO_STAGE_NOP_WRITE; | |
1164 | } | |
428870ff BB |
1165 | } |
1166 | ||
1167 | return (ZIO_PIPELINE_CONTINUE); | |
1168 | } | |
1169 | ||
1170 | static int | |
1171 | zio_free_bp_init(zio_t *zio) | |
1172 | { | |
1173 | blkptr_t *bp = zio->io_bp; | |
1174 | ||
1175 | if (zio->io_child_type == ZIO_CHILD_LOGICAL) { | |
1176 | if (BP_GET_DEDUP(bp)) | |
1177 | zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; | |
b128c09f | 1178 | } |
34dc7c2f BB |
1179 | |
1180 | return (ZIO_PIPELINE_CONTINUE); | |
1181 | } | |
1182 | ||
b128c09f BB |
1183 | /* |
1184 | * ========================================================================== | |
1185 | * Execute the I/O pipeline | |
1186 | * ========================================================================== | |
1187 | */ | |
1188 | ||
1189 | static void | |
7ef5e54e | 1190 | zio_taskq_dispatch(zio_t *zio, zio_taskq_type_t q, boolean_t cutinline) |
34dc7c2f | 1191 | { |
428870ff | 1192 | spa_t *spa = zio->io_spa; |
b128c09f | 1193 | zio_type_t t = zio->io_type; |
a38718a6 | 1194 | int flags = (cutinline ? TQ_FRONT : 0); |
34dc7c2f BB |
1195 | |
1196 | /* | |
9babb374 BB |
1197 | * If we're a config writer or a probe, the normal issue and |
1198 | * interrupt threads may all be blocked waiting for the config lock. | |
1199 | * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. | |
34dc7c2f | 1200 | */ |
9babb374 | 1201 | if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) |
b128c09f | 1202 | t = ZIO_TYPE_NULL; |
34dc7c2f BB |
1203 | |
1204 | /* | |
b128c09f | 1205 | * A similar issue exists for the L2ARC write thread until L2ARC 2.0. |
34dc7c2f | 1206 | */ |
b128c09f BB |
1207 | if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) |
1208 | t = ZIO_TYPE_NULL; | |
34dc7c2f | 1209 | |
428870ff | 1210 | /* |
7ef5e54e AL |
1211 | * If this is a high priority I/O, then use the high priority taskq if |
1212 | * available. | |
428870ff BB |
1213 | */ |
1214 | if (zio->io_priority == ZIO_PRIORITY_NOW && | |
7ef5e54e | 1215 | spa->spa_zio_taskq[t][q + 1].stqs_count != 0) |
428870ff BB |
1216 | q++; |
1217 | ||
1218 | ASSERT3U(q, <, ZIO_TASKQ_TYPES); | |
5cc556b4 | 1219 | |
a38718a6 GA |
1220 | /* |
1221 | * NB: We are assuming that the zio can only be dispatched | |
1222 | * to a single taskq at a time. It would be a grievous error | |
1223 | * to dispatch the zio to another taskq at the same time. | |
1224 | */ | |
1225 | ASSERT(taskq_empty_ent(&zio->io_tqent)); | |
7ef5e54e AL |
1226 | spa_taskq_dispatch_ent(spa, t, q, (task_func_t *)zio_execute, zio, |
1227 | flags, &zio->io_tqent); | |
b128c09f | 1228 | } |
34dc7c2f | 1229 | |
b128c09f | 1230 | static boolean_t |
7ef5e54e | 1231 | zio_taskq_member(zio_t *zio, zio_taskq_type_t q) |
b128c09f BB |
1232 | { |
1233 | kthread_t *executor = zio->io_executor; | |
1234 | spa_t *spa = zio->io_spa; | |
d6320ddb | 1235 | zio_type_t t; |
34dc7c2f | 1236 | |
7ef5e54e AL |
1237 | for (t = 0; t < ZIO_TYPES; t++) { |
1238 | spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; | |
1239 | uint_t i; | |
1240 | for (i = 0; i < tqs->stqs_count; i++) { | |
1241 | if (taskq_member(tqs->stqs_taskq[i], executor)) | |
1242 | return (B_TRUE); | |
1243 | } | |
1244 | } | |
34dc7c2f | 1245 | |
b128c09f BB |
1246 | return (B_FALSE); |
1247 | } | |
34dc7c2f | 1248 | |
b128c09f BB |
1249 | static int |
1250 | zio_issue_async(zio_t *zio) | |
1251 | { | |
428870ff | 1252 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); |
b128c09f BB |
1253 | |
1254 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
1255 | } |
1256 | ||
b128c09f BB |
1257 | void |
1258 | zio_interrupt(zio_t *zio) | |
34dc7c2f | 1259 | { |
428870ff | 1260 | zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE); |
b128c09f | 1261 | } |
34dc7c2f | 1262 | |
b128c09f BB |
1263 | /* |
1264 | * Execute the I/O pipeline until one of the following occurs: | |
1265 | * (1) the I/O completes; (2) the pipeline stalls waiting for | |
1266 | * dependent child I/Os; (3) the I/O issues, so we're waiting | |
1267 | * for an I/O completion interrupt; (4) the I/O is delegated by | |
1268 | * vdev-level caching or aggregation; (5) the I/O is deferred | |
1269 | * due to vdev-level queueing; (6) the I/O is handed off to | |
1270 | * another thread. In all cases, the pipeline stops whenever | |
8e07b99b | 1271 | * there's no CPU work; it never burns a thread in cv_wait_io(). |
b128c09f BB |
1272 | * |
1273 | * There's no locking on io_stage because there's no legitimate way | |
1274 | * for multiple threads to be attempting to process the same I/O. | |
1275 | */ | |
428870ff | 1276 | static zio_pipe_stage_t *zio_pipeline[]; |
34dc7c2f | 1277 | |
da6b4005 NB |
1278 | /* |
1279 | * zio_execute() is a wrapper around the static function | |
1280 | * __zio_execute() so that we can force __zio_execute() to be | |
1281 | * inlined. This reduces stack overhead which is important | |
1282 | * because __zio_execute() is called recursively in several zio | |
1283 | * code paths. zio_execute() itself cannot be inlined because | |
1284 | * it is externally visible. | |
1285 | */ | |
b128c09f BB |
1286 | void |
1287 | zio_execute(zio_t *zio) | |
da6b4005 | 1288 | { |
92119cc2 BB |
1289 | fstrans_cookie_t cookie; |
1290 | ||
1291 | cookie = spl_fstrans_mark(); | |
da6b4005 | 1292 | __zio_execute(zio); |
92119cc2 | 1293 | spl_fstrans_unmark(cookie); |
da6b4005 NB |
1294 | } |
1295 | ||
1296 | __attribute__((always_inline)) | |
1297 | static inline void | |
1298 | __zio_execute(zio_t *zio) | |
b128c09f BB |
1299 | { |
1300 | zio->io_executor = curthread; | |
34dc7c2f | 1301 | |
b128c09f | 1302 | while (zio->io_stage < ZIO_STAGE_DONE) { |
428870ff BB |
1303 | enum zio_stage pipeline = zio->io_pipeline; |
1304 | enum zio_stage stage = zio->io_stage; | |
91579709 | 1305 | dsl_pool_t *dp; |
2fac4c2a | 1306 | boolean_t cut; |
b128c09f | 1307 | int rv; |
34dc7c2f | 1308 | |
b128c09f | 1309 | ASSERT(!MUTEX_HELD(&zio->io_lock)); |
428870ff BB |
1310 | ASSERT(ISP2(stage)); |
1311 | ASSERT(zio->io_stall == NULL); | |
34dc7c2f | 1312 | |
428870ff BB |
1313 | do { |
1314 | stage <<= 1; | |
1315 | } while ((stage & pipeline) == 0); | |
b128c09f BB |
1316 | |
1317 | ASSERT(stage <= ZIO_STAGE_DONE); | |
34dc7c2f | 1318 | |
91579709 | 1319 | dp = spa_get_dsl(zio->io_spa); |
2fac4c2a BB |
1320 | cut = (stage == ZIO_STAGE_VDEV_IO_START) ? |
1321 | zio_requeue_io_start_cut_in_line : B_FALSE; | |
1322 | ||
34dc7c2f | 1323 | /* |
b128c09f BB |
1324 | * If we are in interrupt context and this pipeline stage |
1325 | * will grab a config lock that is held across I/O, | |
428870ff BB |
1326 | * or may wait for an I/O that needs an interrupt thread |
1327 | * to complete, issue async to avoid deadlock. | |
1328 | * | |
1329 | * For VDEV_IO_START, we cut in line so that the io will | |
1330 | * be sent to disk promptly. | |
34dc7c2f | 1331 | */ |
91579709 BB |
1332 | if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && |
1333 | zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { | |
1334 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); | |
1335 | return; | |
1336 | } | |
1337 | ||
1338 | /* | |
1339 | * If we executing in the context of the tx_sync_thread, | |
1340 | * or we are performing pool initialization outside of a | |
34e14332 BB |
1341 | * zio_taskq[ZIO_TASKQ_ISSUE|ZIO_TASKQ_ISSUE_HIGH] context. |
1342 | * Then issue the zio asynchronously to minimize stack usage | |
1343 | * for these deep call paths. | |
91579709 BB |
1344 | */ |
1345 | if ((dp && curthread == dp->dp_tx.tx_sync_thread) || | |
1346 | (dp && spa_is_initializing(dp->dp_spa) && | |
34e14332 BB |
1347 | !zio_taskq_member(zio, ZIO_TASKQ_ISSUE) && |
1348 | !zio_taskq_member(zio, ZIO_TASKQ_ISSUE_HIGH))) { | |
428870ff | 1349 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); |
b128c09f | 1350 | return; |
34dc7c2f BB |
1351 | } |
1352 | ||
b128c09f | 1353 | zio->io_stage = stage; |
9bd274dd | 1354 | rv = zio_pipeline[highbit64(stage) - 1](zio); |
34dc7c2f | 1355 | |
b128c09f BB |
1356 | if (rv == ZIO_PIPELINE_STOP) |
1357 | return; | |
34dc7c2f | 1358 | |
b128c09f BB |
1359 | ASSERT(rv == ZIO_PIPELINE_CONTINUE); |
1360 | } | |
34dc7c2f BB |
1361 | } |
1362 | ||
da6b4005 | 1363 | |
b128c09f BB |
1364 | /* |
1365 | * ========================================================================== | |
1366 | * Initiate I/O, either sync or async | |
1367 | * ========================================================================== | |
1368 | */ | |
1369 | int | |
1370 | zio_wait(zio_t *zio) | |
34dc7c2f | 1371 | { |
b128c09f | 1372 | int error; |
34dc7c2f | 1373 | |
b128c09f BB |
1374 | ASSERT(zio->io_stage == ZIO_STAGE_OPEN); |
1375 | ASSERT(zio->io_executor == NULL); | |
34dc7c2f | 1376 | |
b128c09f | 1377 | zio->io_waiter = curthread; |
34dc7c2f | 1378 | |
da6b4005 | 1379 | __zio_execute(zio); |
34dc7c2f | 1380 | |
b128c09f | 1381 | mutex_enter(&zio->io_lock); |
72f53c56 | 1382 | while (zio->io_executor != NULL) |
72938d69 | 1383 | cv_wait_io(&zio->io_cv, &zio->io_lock); |
b128c09f | 1384 | mutex_exit(&zio->io_lock); |
34dc7c2f | 1385 | |
b128c09f BB |
1386 | error = zio->io_error; |
1387 | zio_destroy(zio); | |
34dc7c2f | 1388 | |
b128c09f BB |
1389 | return (error); |
1390 | } | |
34dc7c2f | 1391 | |
b128c09f BB |
1392 | void |
1393 | zio_nowait(zio_t *zio) | |
1394 | { | |
1395 | ASSERT(zio->io_executor == NULL); | |
34dc7c2f | 1396 | |
d164b209 BB |
1397 | if (zio->io_child_type == ZIO_CHILD_LOGICAL && |
1398 | zio_unique_parent(zio) == NULL) { | |
8878261f BB |
1399 | zio_t *pio; |
1400 | ||
34dc7c2f | 1401 | /* |
b128c09f | 1402 | * This is a logical async I/O with no parent to wait for it. |
9babb374 BB |
1403 | * We add it to the spa_async_root_zio "Godfather" I/O which |
1404 | * will ensure they complete prior to unloading the pool. | |
34dc7c2f | 1405 | */ |
b128c09f | 1406 | spa_t *spa = zio->io_spa; |
8878261f BB |
1407 | kpreempt_disable(); |
1408 | pio = spa->spa_async_zio_root[CPU_SEQID]; | |
1409 | kpreempt_enable(); | |
9babb374 | 1410 | |
8878261f | 1411 | zio_add_child(pio, zio); |
b128c09f | 1412 | } |
34dc7c2f | 1413 | |
da6b4005 | 1414 | __zio_execute(zio); |
b128c09f | 1415 | } |
34dc7c2f | 1416 | |
b128c09f BB |
1417 | /* |
1418 | * ========================================================================== | |
1419 | * Reexecute or suspend/resume failed I/O | |
1420 | * ========================================================================== | |
1421 | */ | |
34dc7c2f | 1422 | |
b128c09f BB |
1423 | static void |
1424 | zio_reexecute(zio_t *pio) | |
1425 | { | |
d164b209 | 1426 | zio_t *cio, *cio_next; |
d6320ddb | 1427 | int c, w; |
d164b209 BB |
1428 | |
1429 | ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); | |
1430 | ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); | |
9babb374 BB |
1431 | ASSERT(pio->io_gang_leader == NULL); |
1432 | ASSERT(pio->io_gang_tree == NULL); | |
34dc7c2f | 1433 | |
b128c09f BB |
1434 | pio->io_flags = pio->io_orig_flags; |
1435 | pio->io_stage = pio->io_orig_stage; | |
1436 | pio->io_pipeline = pio->io_orig_pipeline; | |
1437 | pio->io_reexecute = 0; | |
03c6040b | 1438 | pio->io_flags |= ZIO_FLAG_REEXECUTED; |
b128c09f | 1439 | pio->io_error = 0; |
d6320ddb | 1440 | for (w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 | 1441 | pio->io_state[w] = 0; |
d6320ddb | 1442 | for (c = 0; c < ZIO_CHILD_TYPES; c++) |
b128c09f | 1443 | pio->io_child_error[c] = 0; |
34dc7c2f | 1444 | |
428870ff BB |
1445 | if (IO_IS_ALLOCATING(pio)) |
1446 | BP_ZERO(pio->io_bp); | |
34dc7c2f | 1447 | |
b128c09f BB |
1448 | /* |
1449 | * As we reexecute pio's children, new children could be created. | |
d164b209 | 1450 | * New children go to the head of pio's io_child_list, however, |
b128c09f | 1451 | * so we will (correctly) not reexecute them. The key is that |
d164b209 BB |
1452 | * the remainder of pio's io_child_list, from 'cio_next' onward, |
1453 | * cannot be affected by any side effects of reexecuting 'cio'. | |
b128c09f | 1454 | */ |
d164b209 BB |
1455 | for (cio = zio_walk_children(pio); cio != NULL; cio = cio_next) { |
1456 | cio_next = zio_walk_children(pio); | |
b128c09f | 1457 | mutex_enter(&pio->io_lock); |
d6320ddb | 1458 | for (w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 | 1459 | pio->io_children[cio->io_child_type][w]++; |
b128c09f | 1460 | mutex_exit(&pio->io_lock); |
d164b209 | 1461 | zio_reexecute(cio); |
34dc7c2f | 1462 | } |
34dc7c2f | 1463 | |
b128c09f BB |
1464 | /* |
1465 | * Now that all children have been reexecuted, execute the parent. | |
9babb374 BB |
1466 | * We don't reexecute "The Godfather" I/O here as it's the |
1467 | * responsibility of the caller to wait on him. | |
b128c09f | 1468 | */ |
9babb374 | 1469 | if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) |
da6b4005 | 1470 | __zio_execute(pio); |
34dc7c2f BB |
1471 | } |
1472 | ||
b128c09f BB |
1473 | void |
1474 | zio_suspend(spa_t *spa, zio_t *zio) | |
34dc7c2f | 1475 | { |
b128c09f BB |
1476 | if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) |
1477 | fm_panic("Pool '%s' has encountered an uncorrectable I/O " | |
1478 | "failure and the failure mode property for this pool " | |
1479 | "is set to panic.", spa_name(spa)); | |
34dc7c2f | 1480 | |
bf89c199 BB |
1481 | cmn_err(CE_WARN, "Pool '%s' has encountered an uncorrectable I/O " |
1482 | "failure and has been suspended.\n", spa_name(spa)); | |
1483 | ||
b128c09f | 1484 | zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); |
34dc7c2f | 1485 | |
b128c09f | 1486 | mutex_enter(&spa->spa_suspend_lock); |
34dc7c2f | 1487 | |
b128c09f | 1488 | if (spa->spa_suspend_zio_root == NULL) |
9babb374 BB |
1489 | spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, |
1490 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | | |
1491 | ZIO_FLAG_GODFATHER); | |
34dc7c2f | 1492 | |
b128c09f | 1493 | spa->spa_suspended = B_TRUE; |
34dc7c2f | 1494 | |
b128c09f | 1495 | if (zio != NULL) { |
9babb374 | 1496 | ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); |
b128c09f BB |
1497 | ASSERT(zio != spa->spa_suspend_zio_root); |
1498 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
d164b209 | 1499 | ASSERT(zio_unique_parent(zio) == NULL); |
b128c09f BB |
1500 | ASSERT(zio->io_stage == ZIO_STAGE_DONE); |
1501 | zio_add_child(spa->spa_suspend_zio_root, zio); | |
1502 | } | |
34dc7c2f | 1503 | |
b128c09f BB |
1504 | mutex_exit(&spa->spa_suspend_lock); |
1505 | } | |
34dc7c2f | 1506 | |
9babb374 | 1507 | int |
b128c09f BB |
1508 | zio_resume(spa_t *spa) |
1509 | { | |
9babb374 | 1510 | zio_t *pio; |
34dc7c2f BB |
1511 | |
1512 | /* | |
b128c09f | 1513 | * Reexecute all previously suspended i/o. |
34dc7c2f | 1514 | */ |
b128c09f BB |
1515 | mutex_enter(&spa->spa_suspend_lock); |
1516 | spa->spa_suspended = B_FALSE; | |
1517 | cv_broadcast(&spa->spa_suspend_cv); | |
1518 | pio = spa->spa_suspend_zio_root; | |
1519 | spa->spa_suspend_zio_root = NULL; | |
1520 | mutex_exit(&spa->spa_suspend_lock); | |
1521 | ||
1522 | if (pio == NULL) | |
9babb374 | 1523 | return (0); |
34dc7c2f | 1524 | |
9babb374 BB |
1525 | zio_reexecute(pio); |
1526 | return (zio_wait(pio)); | |
b128c09f BB |
1527 | } |
1528 | ||
1529 | void | |
1530 | zio_resume_wait(spa_t *spa) | |
1531 | { | |
1532 | mutex_enter(&spa->spa_suspend_lock); | |
1533 | while (spa_suspended(spa)) | |
1534 | cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); | |
1535 | mutex_exit(&spa->spa_suspend_lock); | |
34dc7c2f BB |
1536 | } |
1537 | ||
1538 | /* | |
1539 | * ========================================================================== | |
b128c09f BB |
1540 | * Gang blocks. |
1541 | * | |
1542 | * A gang block is a collection of small blocks that looks to the DMU | |
1543 | * like one large block. When zio_dva_allocate() cannot find a block | |
1544 | * of the requested size, due to either severe fragmentation or the pool | |
1545 | * being nearly full, it calls zio_write_gang_block() to construct the | |
1546 | * block from smaller fragments. | |
1547 | * | |
1548 | * A gang block consists of a gang header (zio_gbh_phys_t) and up to | |
1549 | * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like | |
1550 | * an indirect block: it's an array of block pointers. It consumes | |
1551 | * only one sector and hence is allocatable regardless of fragmentation. | |
1552 | * The gang header's bps point to its gang members, which hold the data. | |
1553 | * | |
1554 | * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> | |
1555 | * as the verifier to ensure uniqueness of the SHA256 checksum. | |
1556 | * Critically, the gang block bp's blk_cksum is the checksum of the data, | |
1557 | * not the gang header. This ensures that data block signatures (needed for | |
1558 | * deduplication) are independent of how the block is physically stored. | |
1559 | * | |
1560 | * Gang blocks can be nested: a gang member may itself be a gang block. | |
1561 | * Thus every gang block is a tree in which root and all interior nodes are | |
1562 | * gang headers, and the leaves are normal blocks that contain user data. | |
1563 | * The root of the gang tree is called the gang leader. | |
1564 | * | |
1565 | * To perform any operation (read, rewrite, free, claim) on a gang block, | |
1566 | * zio_gang_assemble() first assembles the gang tree (minus data leaves) | |
1567 | * in the io_gang_tree field of the original logical i/o by recursively | |
1568 | * reading the gang leader and all gang headers below it. This yields | |
1569 | * an in-core tree containing the contents of every gang header and the | |
1570 | * bps for every constituent of the gang block. | |
1571 | * | |
1572 | * With the gang tree now assembled, zio_gang_issue() just walks the gang tree | |
1573 | * and invokes a callback on each bp. To free a gang block, zio_gang_issue() | |
1574 | * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. | |
1575 | * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). | |
1576 | * zio_read_gang() is a wrapper around zio_read() that omits reading gang | |
1577 | * headers, since we already have those in io_gang_tree. zio_rewrite_gang() | |
1578 | * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() | |
1579 | * of the gang header plus zio_checksum_compute() of the data to update the | |
1580 | * gang header's blk_cksum as described above. | |
1581 | * | |
1582 | * The two-phase assemble/issue model solves the problem of partial failure -- | |
1583 | * what if you'd freed part of a gang block but then couldn't read the | |
1584 | * gang header for another part? Assembling the entire gang tree first | |
1585 | * ensures that all the necessary gang header I/O has succeeded before | |
1586 | * starting the actual work of free, claim, or write. Once the gang tree | |
1587 | * is assembled, free and claim are in-memory operations that cannot fail. | |
1588 | * | |
1589 | * In the event that a gang write fails, zio_dva_unallocate() walks the | |
1590 | * gang tree to immediately free (i.e. insert back into the space map) | |
1591 | * everything we've allocated. This ensures that we don't get ENOSPC | |
1592 | * errors during repeated suspend/resume cycles due to a flaky device. | |
1593 | * | |
1594 | * Gang rewrites only happen during sync-to-convergence. If we can't assemble | |
1595 | * the gang tree, we won't modify the block, so we can safely defer the free | |
1596 | * (knowing that the block is still intact). If we *can* assemble the gang | |
1597 | * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free | |
1598 | * each constituent bp and we can allocate a new block on the next sync pass. | |
1599 | * | |
1600 | * In all cases, the gang tree allows complete recovery from partial failure. | |
34dc7c2f BB |
1601 | * ========================================================================== |
1602 | */ | |
b128c09f BB |
1603 | |
1604 | static zio_t * | |
1605 | zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
34dc7c2f | 1606 | { |
b128c09f BB |
1607 | if (gn != NULL) |
1608 | return (pio); | |
34dc7c2f | 1609 | |
b128c09f BB |
1610 | return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), |
1611 | NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), | |
1612 | &pio->io_bookmark)); | |
1613 | } | |
1614 | ||
1615 | zio_t * | |
1616 | zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
1617 | { | |
1618 | zio_t *zio; | |
1619 | ||
1620 | if (gn != NULL) { | |
1621 | zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, | |
1622 | gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, | |
1623 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f | 1624 | /* |
b128c09f BB |
1625 | * As we rewrite each gang header, the pipeline will compute |
1626 | * a new gang block header checksum for it; but no one will | |
1627 | * compute a new data checksum, so we do that here. The one | |
1628 | * exception is the gang leader: the pipeline already computed | |
1629 | * its data checksum because that stage precedes gang assembly. | |
1630 | * (Presently, nothing actually uses interior data checksums; | |
1631 | * this is just good hygiene.) | |
34dc7c2f | 1632 | */ |
9babb374 | 1633 | if (gn != pio->io_gang_leader->io_gang_tree) { |
b128c09f BB |
1634 | zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), |
1635 | data, BP_GET_PSIZE(bp)); | |
1636 | } | |
428870ff BB |
1637 | /* |
1638 | * If we are here to damage data for testing purposes, | |
1639 | * leave the GBH alone so that we can detect the damage. | |
1640 | */ | |
1641 | if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) | |
1642 | zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; | |
34dc7c2f | 1643 | } else { |
b128c09f BB |
1644 | zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, |
1645 | data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, | |
1646 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f BB |
1647 | } |
1648 | ||
b128c09f BB |
1649 | return (zio); |
1650 | } | |
34dc7c2f | 1651 | |
b128c09f BB |
1652 | /* ARGSUSED */ |
1653 | zio_t * | |
1654 | zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
1655 | { | |
428870ff BB |
1656 | return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, |
1657 | ZIO_GANG_CHILD_FLAGS(pio))); | |
34dc7c2f BB |
1658 | } |
1659 | ||
b128c09f BB |
1660 | /* ARGSUSED */ |
1661 | zio_t * | |
1662 | zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
34dc7c2f | 1663 | { |
b128c09f BB |
1664 | return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, |
1665 | NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); | |
1666 | } | |
1667 | ||
1668 | static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { | |
1669 | NULL, | |
1670 | zio_read_gang, | |
1671 | zio_rewrite_gang, | |
1672 | zio_free_gang, | |
1673 | zio_claim_gang, | |
1674 | NULL | |
1675 | }; | |
34dc7c2f | 1676 | |
b128c09f | 1677 | static void zio_gang_tree_assemble_done(zio_t *zio); |
34dc7c2f | 1678 | |
b128c09f BB |
1679 | static zio_gang_node_t * |
1680 | zio_gang_node_alloc(zio_gang_node_t **gnpp) | |
1681 | { | |
1682 | zio_gang_node_t *gn; | |
34dc7c2f | 1683 | |
b128c09f | 1684 | ASSERT(*gnpp == NULL); |
34dc7c2f | 1685 | |
79c76d5b | 1686 | gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); |
b128c09f BB |
1687 | gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); |
1688 | *gnpp = gn; | |
34dc7c2f | 1689 | |
b128c09f | 1690 | return (gn); |
34dc7c2f BB |
1691 | } |
1692 | ||
34dc7c2f | 1693 | static void |
b128c09f | 1694 | zio_gang_node_free(zio_gang_node_t **gnpp) |
34dc7c2f | 1695 | { |
b128c09f | 1696 | zio_gang_node_t *gn = *gnpp; |
d6320ddb | 1697 | int g; |
34dc7c2f | 1698 | |
d6320ddb | 1699 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) |
b128c09f BB |
1700 | ASSERT(gn->gn_child[g] == NULL); |
1701 | ||
1702 | zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); | |
1703 | kmem_free(gn, sizeof (*gn)); | |
1704 | *gnpp = NULL; | |
34dc7c2f BB |
1705 | } |
1706 | ||
b128c09f BB |
1707 | static void |
1708 | zio_gang_tree_free(zio_gang_node_t **gnpp) | |
34dc7c2f | 1709 | { |
b128c09f | 1710 | zio_gang_node_t *gn = *gnpp; |
d6320ddb | 1711 | int g; |
34dc7c2f | 1712 | |
b128c09f BB |
1713 | if (gn == NULL) |
1714 | return; | |
34dc7c2f | 1715 | |
d6320ddb | 1716 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) |
b128c09f | 1717 | zio_gang_tree_free(&gn->gn_child[g]); |
34dc7c2f | 1718 | |
b128c09f | 1719 | zio_gang_node_free(gnpp); |
34dc7c2f BB |
1720 | } |
1721 | ||
b128c09f | 1722 | static void |
9babb374 | 1723 | zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) |
34dc7c2f | 1724 | { |
b128c09f BB |
1725 | zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); |
1726 | ||
9babb374 | 1727 | ASSERT(gio->io_gang_leader == gio); |
b128c09f | 1728 | ASSERT(BP_IS_GANG(bp)); |
34dc7c2f | 1729 | |
9babb374 | 1730 | zio_nowait(zio_read(gio, gio->io_spa, bp, gn->gn_gbh, |
b128c09f | 1731 | SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, |
9babb374 | 1732 | gio->io_priority, ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); |
b128c09f | 1733 | } |
34dc7c2f | 1734 | |
b128c09f BB |
1735 | static void |
1736 | zio_gang_tree_assemble_done(zio_t *zio) | |
1737 | { | |
9babb374 | 1738 | zio_t *gio = zio->io_gang_leader; |
b128c09f BB |
1739 | zio_gang_node_t *gn = zio->io_private; |
1740 | blkptr_t *bp = zio->io_bp; | |
d6320ddb | 1741 | int g; |
34dc7c2f | 1742 | |
9babb374 | 1743 | ASSERT(gio == zio_unique_parent(zio)); |
428870ff | 1744 | ASSERT(zio->io_child_count == 0); |
34dc7c2f | 1745 | |
b128c09f BB |
1746 | if (zio->io_error) |
1747 | return; | |
34dc7c2f | 1748 | |
b128c09f BB |
1749 | if (BP_SHOULD_BYTESWAP(bp)) |
1750 | byteswap_uint64_array(zio->io_data, zio->io_size); | |
34dc7c2f | 1751 | |
b128c09f BB |
1752 | ASSERT(zio->io_data == gn->gn_gbh); |
1753 | ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); | |
428870ff | 1754 | ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); |
34dc7c2f | 1755 | |
d6320ddb | 1756 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
1757 | blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; |
1758 | if (!BP_IS_GANG(gbp)) | |
1759 | continue; | |
9babb374 | 1760 | zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); |
b128c09f | 1761 | } |
34dc7c2f BB |
1762 | } |
1763 | ||
b128c09f BB |
1764 | static void |
1765 | zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) | |
34dc7c2f | 1766 | { |
9babb374 | 1767 | zio_t *gio = pio->io_gang_leader; |
b128c09f | 1768 | zio_t *zio; |
d6320ddb | 1769 | int g; |
34dc7c2f | 1770 | |
b128c09f | 1771 | ASSERT(BP_IS_GANG(bp) == !!gn); |
9babb374 BB |
1772 | ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); |
1773 | ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); | |
34dc7c2f | 1774 | |
b128c09f BB |
1775 | /* |
1776 | * If you're a gang header, your data is in gn->gn_gbh. | |
1777 | * If you're a gang member, your data is in 'data' and gn == NULL. | |
1778 | */ | |
9babb374 | 1779 | zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data); |
34dc7c2f | 1780 | |
b128c09f | 1781 | if (gn != NULL) { |
428870ff | 1782 | ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); |
34dc7c2f | 1783 | |
d6320ddb | 1784 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
1785 | blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; |
1786 | if (BP_IS_HOLE(gbp)) | |
1787 | continue; | |
1788 | zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); | |
1789 | data = (char *)data + BP_GET_PSIZE(gbp); | |
1790 | } | |
34dc7c2f BB |
1791 | } |
1792 | ||
9babb374 BB |
1793 | if (gn == gio->io_gang_tree) |
1794 | ASSERT3P((char *)gio->io_data + gio->io_size, ==, data); | |
34dc7c2f | 1795 | |
b128c09f BB |
1796 | if (zio != pio) |
1797 | zio_nowait(zio); | |
34dc7c2f BB |
1798 | } |
1799 | ||
1800 | static int | |
b128c09f | 1801 | zio_gang_assemble(zio_t *zio) |
34dc7c2f | 1802 | { |
b128c09f | 1803 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 1804 | |
9babb374 BB |
1805 | ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); |
1806 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
1807 | ||
1808 | zio->io_gang_leader = zio; | |
34dc7c2f | 1809 | |
b128c09f | 1810 | zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); |
34dc7c2f BB |
1811 | |
1812 | return (ZIO_PIPELINE_CONTINUE); | |
1813 | } | |
1814 | ||
1815 | static int | |
b128c09f | 1816 | zio_gang_issue(zio_t *zio) |
34dc7c2f | 1817 | { |
b128c09f | 1818 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 1819 | |
b128c09f BB |
1820 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) |
1821 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 1822 | |
9babb374 BB |
1823 | ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); |
1824 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
34dc7c2f | 1825 | |
b128c09f | 1826 | if (zio->io_child_error[ZIO_CHILD_GANG] == 0) |
9babb374 | 1827 | zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_data); |
b128c09f | 1828 | else |
9babb374 | 1829 | zio_gang_tree_free(&zio->io_gang_tree); |
34dc7c2f | 1830 | |
b128c09f | 1831 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
34dc7c2f BB |
1832 | |
1833 | return (ZIO_PIPELINE_CONTINUE); | |
1834 | } | |
1835 | ||
1836 | static void | |
b128c09f | 1837 | zio_write_gang_member_ready(zio_t *zio) |
34dc7c2f | 1838 | { |
d164b209 | 1839 | zio_t *pio = zio_unique_parent(zio); |
34dc7c2f BB |
1840 | dva_t *cdva = zio->io_bp->blk_dva; |
1841 | dva_t *pdva = pio->io_bp->blk_dva; | |
1842 | uint64_t asize; | |
d6320ddb | 1843 | int d; |
d1d7e268 | 1844 | ASSERTV(zio_t *gio = zio->io_gang_leader); |
34dc7c2f | 1845 | |
b128c09f BB |
1846 | if (BP_IS_HOLE(zio->io_bp)) |
1847 | return; | |
1848 | ||
1849 | ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); | |
1850 | ||
1851 | ASSERT(zio->io_child_type == ZIO_CHILD_GANG); | |
428870ff BB |
1852 | ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); |
1853 | ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); | |
1854 | ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); | |
34dc7c2f | 1855 | ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); |
34dc7c2f BB |
1856 | |
1857 | mutex_enter(&pio->io_lock); | |
d6320ddb | 1858 | for (d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { |
34dc7c2f BB |
1859 | ASSERT(DVA_GET_GANG(&pdva[d])); |
1860 | asize = DVA_GET_ASIZE(&pdva[d]); | |
1861 | asize += DVA_GET_ASIZE(&cdva[d]); | |
1862 | DVA_SET_ASIZE(&pdva[d], asize); | |
1863 | } | |
1864 | mutex_exit(&pio->io_lock); | |
1865 | } | |
1866 | ||
1867 | static int | |
b128c09f | 1868 | zio_write_gang_block(zio_t *pio) |
34dc7c2f | 1869 | { |
b128c09f BB |
1870 | spa_t *spa = pio->io_spa; |
1871 | blkptr_t *bp = pio->io_bp; | |
9babb374 | 1872 | zio_t *gio = pio->io_gang_leader; |
b128c09f BB |
1873 | zio_t *zio; |
1874 | zio_gang_node_t *gn, **gnpp; | |
34dc7c2f | 1875 | zio_gbh_phys_t *gbh; |
b128c09f BB |
1876 | uint64_t txg = pio->io_txg; |
1877 | uint64_t resid = pio->io_size; | |
1878 | uint64_t lsize; | |
428870ff BB |
1879 | int copies = gio->io_prop.zp_copies; |
1880 | int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); | |
b128c09f | 1881 | zio_prop_t zp; |
d6320ddb | 1882 | int g, error; |
34dc7c2f | 1883 | |
428870ff BB |
1884 | error = metaslab_alloc(spa, spa_normal_class(spa), SPA_GANGBLOCKSIZE, |
1885 | bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, | |
b128c09f | 1886 | METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); |
34dc7c2f | 1887 | if (error) { |
b128c09f | 1888 | pio->io_error = error; |
34dc7c2f BB |
1889 | return (ZIO_PIPELINE_CONTINUE); |
1890 | } | |
1891 | ||
9babb374 BB |
1892 | if (pio == gio) { |
1893 | gnpp = &gio->io_gang_tree; | |
b128c09f BB |
1894 | } else { |
1895 | gnpp = pio->io_private; | |
1896 | ASSERT(pio->io_ready == zio_write_gang_member_ready); | |
34dc7c2f BB |
1897 | } |
1898 | ||
b128c09f BB |
1899 | gn = zio_gang_node_alloc(gnpp); |
1900 | gbh = gn->gn_gbh; | |
1901 | bzero(gbh, SPA_GANGBLOCKSIZE); | |
34dc7c2f | 1902 | |
b128c09f BB |
1903 | /* |
1904 | * Create the gang header. | |
1905 | */ | |
1906 | zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, | |
1907 | pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f | 1908 | |
b128c09f BB |
1909 | /* |
1910 | * Create and nowait the gang children. | |
1911 | */ | |
d6320ddb | 1912 | for (g = 0; resid != 0; resid -= lsize, g++) { |
b128c09f BB |
1913 | lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), |
1914 | SPA_MINBLOCKSIZE); | |
1915 | ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); | |
1916 | ||
9babb374 | 1917 | zp.zp_checksum = gio->io_prop.zp_checksum; |
b128c09f BB |
1918 | zp.zp_compress = ZIO_COMPRESS_OFF; |
1919 | zp.zp_type = DMU_OT_NONE; | |
1920 | zp.zp_level = 0; | |
428870ff | 1921 | zp.zp_copies = gio->io_prop.zp_copies; |
03c6040b GW |
1922 | zp.zp_dedup = B_FALSE; |
1923 | zp.zp_dedup_verify = B_FALSE; | |
1924 | zp.zp_nopwrite = B_FALSE; | |
b128c09f BB |
1925 | |
1926 | zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], | |
1927 | (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, | |
e8b96c60 | 1928 | zio_write_gang_member_ready, NULL, NULL, &gn->gn_child[g], |
b128c09f BB |
1929 | pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), |
1930 | &pio->io_bookmark)); | |
1931 | } | |
34dc7c2f BB |
1932 | |
1933 | /* | |
b128c09f | 1934 | * Set pio's pipeline to just wait for zio to finish. |
34dc7c2f | 1935 | */ |
b128c09f BB |
1936 | pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
1937 | ||
920dd524 ED |
1938 | /* |
1939 | * We didn't allocate this bp, so make sure it doesn't get unmarked. | |
1940 | */ | |
1941 | pio->io_flags &= ~ZIO_FLAG_FASTWRITE; | |
1942 | ||
b128c09f BB |
1943 | zio_nowait(zio); |
1944 | ||
1945 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f BB |
1946 | } |
1947 | ||
03c6040b GW |
1948 | /* |
1949 | * The zio_nop_write stage in the pipeline determines if allocating | |
1950 | * a new bp is necessary. By leveraging a cryptographically secure checksum, | |
1951 | * such as SHA256, we can compare the checksums of the new data and the old | |
1952 | * to determine if allocating a new block is required. The nopwrite | |
1953 | * feature can handle writes in either syncing or open context (i.e. zil | |
1954 | * writes) and as a result is mutually exclusive with dedup. | |
1955 | */ | |
1956 | static int | |
1957 | zio_nop_write(zio_t *zio) | |
1958 | { | |
1959 | blkptr_t *bp = zio->io_bp; | |
1960 | blkptr_t *bp_orig = &zio->io_bp_orig; | |
1961 | zio_prop_t *zp = &zio->io_prop; | |
1962 | ||
1963 | ASSERT(BP_GET_LEVEL(bp) == 0); | |
1964 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); | |
1965 | ASSERT(zp->zp_nopwrite); | |
1966 | ASSERT(!zp->zp_dedup); | |
1967 | ASSERT(zio->io_bp_override == NULL); | |
1968 | ASSERT(IO_IS_ALLOCATING(zio)); | |
1969 | ||
1970 | /* | |
1971 | * Check to see if the original bp and the new bp have matching | |
1972 | * characteristics (i.e. same checksum, compression algorithms, etc). | |
1973 | * If they don't then just continue with the pipeline which will | |
1974 | * allocate a new bp. | |
1975 | */ | |
1976 | if (BP_IS_HOLE(bp_orig) || | |
1977 | !zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_dedup || | |
1978 | BP_GET_CHECKSUM(bp) != BP_GET_CHECKSUM(bp_orig) || | |
1979 | BP_GET_COMPRESS(bp) != BP_GET_COMPRESS(bp_orig) || | |
1980 | BP_GET_DEDUP(bp) != BP_GET_DEDUP(bp_orig) || | |
1981 | zp->zp_copies != BP_GET_NDVAS(bp_orig)) | |
1982 | return (ZIO_PIPELINE_CONTINUE); | |
1983 | ||
1984 | /* | |
1985 | * If the checksums match then reset the pipeline so that we | |
1986 | * avoid allocating a new bp and issuing any I/O. | |
1987 | */ | |
1988 | if (ZIO_CHECKSUM_EQUAL(bp->blk_cksum, bp_orig->blk_cksum)) { | |
1989 | ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup); | |
1990 | ASSERT3U(BP_GET_PSIZE(bp), ==, BP_GET_PSIZE(bp_orig)); | |
1991 | ASSERT3U(BP_GET_LSIZE(bp), ==, BP_GET_LSIZE(bp_orig)); | |
1992 | ASSERT(zp->zp_compress != ZIO_COMPRESS_OFF); | |
1993 | ASSERT(bcmp(&bp->blk_prop, &bp_orig->blk_prop, | |
1994 | sizeof (uint64_t)) == 0); | |
1995 | ||
1996 | *bp = *bp_orig; | |
1997 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
1998 | zio->io_flags |= ZIO_FLAG_NOPWRITE; | |
1999 | } | |
2000 | ||
2001 | return (ZIO_PIPELINE_CONTINUE); | |
2002 | } | |
2003 | ||
34dc7c2f BB |
2004 | /* |
2005 | * ========================================================================== | |
428870ff | 2006 | * Dedup |
34dc7c2f BB |
2007 | * ========================================================================== |
2008 | */ | |
428870ff BB |
2009 | static void |
2010 | zio_ddt_child_read_done(zio_t *zio) | |
2011 | { | |
2012 | blkptr_t *bp = zio->io_bp; | |
2013 | ddt_entry_t *dde = zio->io_private; | |
2014 | ddt_phys_t *ddp; | |
2015 | zio_t *pio = zio_unique_parent(zio); | |
2016 | ||
2017 | mutex_enter(&pio->io_lock); | |
2018 | ddp = ddt_phys_select(dde, bp); | |
2019 | if (zio->io_error == 0) | |
2020 | ddt_phys_clear(ddp); /* this ddp doesn't need repair */ | |
2021 | if (zio->io_error == 0 && dde->dde_repair_data == NULL) | |
2022 | dde->dde_repair_data = zio->io_data; | |
2023 | else | |
2024 | zio_buf_free(zio->io_data, zio->io_size); | |
2025 | mutex_exit(&pio->io_lock); | |
2026 | } | |
2027 | ||
2028 | static int | |
2029 | zio_ddt_read_start(zio_t *zio) | |
2030 | { | |
2031 | blkptr_t *bp = zio->io_bp; | |
d6320ddb | 2032 | int p; |
428870ff BB |
2033 | |
2034 | ASSERT(BP_GET_DEDUP(bp)); | |
2035 | ASSERT(BP_GET_PSIZE(bp) == zio->io_size); | |
2036 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
2037 | ||
2038 | if (zio->io_child_error[ZIO_CHILD_DDT]) { | |
2039 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
2040 | ddt_entry_t *dde = ddt_repair_start(ddt, bp); | |
2041 | ddt_phys_t *ddp = dde->dde_phys; | |
2042 | ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); | |
2043 | blkptr_t blk; | |
2044 | ||
2045 | ASSERT(zio->io_vsd == NULL); | |
2046 | zio->io_vsd = dde; | |
2047 | ||
2048 | if (ddp_self == NULL) | |
2049 | return (ZIO_PIPELINE_CONTINUE); | |
2050 | ||
d6320ddb | 2051 | for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff BB |
2052 | if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) |
2053 | continue; | |
2054 | ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, | |
2055 | &blk); | |
2056 | zio_nowait(zio_read(zio, zio->io_spa, &blk, | |
2057 | zio_buf_alloc(zio->io_size), zio->io_size, | |
2058 | zio_ddt_child_read_done, dde, zio->io_priority, | |
2059 | ZIO_DDT_CHILD_FLAGS(zio) | ZIO_FLAG_DONT_PROPAGATE, | |
2060 | &zio->io_bookmark)); | |
2061 | } | |
2062 | return (ZIO_PIPELINE_CONTINUE); | |
2063 | } | |
2064 | ||
2065 | zio_nowait(zio_read(zio, zio->io_spa, bp, | |
2066 | zio->io_data, zio->io_size, NULL, NULL, zio->io_priority, | |
2067 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); | |
2068 | ||
2069 | return (ZIO_PIPELINE_CONTINUE); | |
2070 | } | |
2071 | ||
2072 | static int | |
2073 | zio_ddt_read_done(zio_t *zio) | |
2074 | { | |
2075 | blkptr_t *bp = zio->io_bp; | |
2076 | ||
2077 | if (zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE)) | |
2078 | return (ZIO_PIPELINE_STOP); | |
2079 | ||
2080 | ASSERT(BP_GET_DEDUP(bp)); | |
2081 | ASSERT(BP_GET_PSIZE(bp) == zio->io_size); | |
2082 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
2083 | ||
2084 | if (zio->io_child_error[ZIO_CHILD_DDT]) { | |
2085 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
2086 | ddt_entry_t *dde = zio->io_vsd; | |
2087 | if (ddt == NULL) { | |
2088 | ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE); | |
2089 | return (ZIO_PIPELINE_CONTINUE); | |
2090 | } | |
2091 | if (dde == NULL) { | |
2092 | zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; | |
2093 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); | |
2094 | return (ZIO_PIPELINE_STOP); | |
2095 | } | |
2096 | if (dde->dde_repair_data != NULL) { | |
2097 | bcopy(dde->dde_repair_data, zio->io_data, zio->io_size); | |
2098 | zio->io_child_error[ZIO_CHILD_DDT] = 0; | |
2099 | } | |
2100 | ddt_repair_done(ddt, dde); | |
2101 | zio->io_vsd = NULL; | |
2102 | } | |
2103 | ||
2104 | ASSERT(zio->io_vsd == NULL); | |
2105 | ||
2106 | return (ZIO_PIPELINE_CONTINUE); | |
2107 | } | |
2108 | ||
2109 | static boolean_t | |
2110 | zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) | |
2111 | { | |
2112 | spa_t *spa = zio->io_spa; | |
d6320ddb | 2113 | int p; |
428870ff BB |
2114 | |
2115 | /* | |
2116 | * Note: we compare the original data, not the transformed data, | |
2117 | * because when zio->io_bp is an override bp, we will not have | |
2118 | * pushed the I/O transforms. That's an important optimization | |
2119 | * because otherwise we'd compress/encrypt all dmu_sync() data twice. | |
2120 | */ | |
d6320ddb | 2121 | for (p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { |
428870ff BB |
2122 | zio_t *lio = dde->dde_lead_zio[p]; |
2123 | ||
2124 | if (lio != NULL) { | |
2125 | return (lio->io_orig_size != zio->io_orig_size || | |
2126 | bcmp(zio->io_orig_data, lio->io_orig_data, | |
2127 | zio->io_orig_size) != 0); | |
2128 | } | |
2129 | } | |
2130 | ||
d6320ddb | 2131 | for (p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { |
428870ff BB |
2132 | ddt_phys_t *ddp = &dde->dde_phys[p]; |
2133 | ||
2134 | if (ddp->ddp_phys_birth != 0) { | |
2135 | arc_buf_t *abuf = NULL; | |
2136 | uint32_t aflags = ARC_WAIT; | |
2137 | blkptr_t blk = *zio->io_bp; | |
2138 | int error; | |
2139 | ||
2140 | ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); | |
2141 | ||
2142 | ddt_exit(ddt); | |
2143 | ||
294f6806 | 2144 | error = arc_read(NULL, spa, &blk, |
428870ff BB |
2145 | arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, |
2146 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, | |
2147 | &aflags, &zio->io_bookmark); | |
2148 | ||
2149 | if (error == 0) { | |
2150 | if (arc_buf_size(abuf) != zio->io_orig_size || | |
2151 | bcmp(abuf->b_data, zio->io_orig_data, | |
2152 | zio->io_orig_size) != 0) | |
2e528b49 | 2153 | error = SET_ERROR(EEXIST); |
13fe0198 | 2154 | VERIFY(arc_buf_remove_ref(abuf, &abuf)); |
428870ff BB |
2155 | } |
2156 | ||
2157 | ddt_enter(ddt); | |
2158 | return (error != 0); | |
2159 | } | |
2160 | } | |
2161 | ||
2162 | return (B_FALSE); | |
2163 | } | |
2164 | ||
2165 | static void | |
2166 | zio_ddt_child_write_ready(zio_t *zio) | |
2167 | { | |
2168 | int p = zio->io_prop.zp_copies; | |
2169 | ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); | |
2170 | ddt_entry_t *dde = zio->io_private; | |
2171 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
2172 | zio_t *pio; | |
2173 | ||
2174 | if (zio->io_error) | |
2175 | return; | |
2176 | ||
2177 | ddt_enter(ddt); | |
2178 | ||
2179 | ASSERT(dde->dde_lead_zio[p] == zio); | |
2180 | ||
2181 | ddt_phys_fill(ddp, zio->io_bp); | |
2182 | ||
2183 | while ((pio = zio_walk_parents(zio)) != NULL) | |
2184 | ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); | |
2185 | ||
2186 | ddt_exit(ddt); | |
2187 | } | |
2188 | ||
2189 | static void | |
2190 | zio_ddt_child_write_done(zio_t *zio) | |
2191 | { | |
2192 | int p = zio->io_prop.zp_copies; | |
2193 | ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); | |
2194 | ddt_entry_t *dde = zio->io_private; | |
2195 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
2196 | ||
2197 | ddt_enter(ddt); | |
2198 | ||
2199 | ASSERT(ddp->ddp_refcnt == 0); | |
2200 | ASSERT(dde->dde_lead_zio[p] == zio); | |
2201 | dde->dde_lead_zio[p] = NULL; | |
2202 | ||
2203 | if (zio->io_error == 0) { | |
2204 | while (zio_walk_parents(zio) != NULL) | |
2205 | ddt_phys_addref(ddp); | |
2206 | } else { | |
2207 | ddt_phys_clear(ddp); | |
2208 | } | |
2209 | ||
2210 | ddt_exit(ddt); | |
2211 | } | |
2212 | ||
2213 | static void | |
2214 | zio_ddt_ditto_write_done(zio_t *zio) | |
2215 | { | |
2216 | int p = DDT_PHYS_DITTO; | |
428870ff BB |
2217 | blkptr_t *bp = zio->io_bp; |
2218 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
2219 | ddt_entry_t *dde = zio->io_private; | |
2220 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
2221 | ddt_key_t *ddk = &dde->dde_key; | |
1fde1e37 | 2222 | ASSERTV(zio_prop_t *zp = &zio->io_prop); |
428870ff BB |
2223 | |
2224 | ddt_enter(ddt); | |
2225 | ||
2226 | ASSERT(ddp->ddp_refcnt == 0); | |
2227 | ASSERT(dde->dde_lead_zio[p] == zio); | |
2228 | dde->dde_lead_zio[p] = NULL; | |
2229 | ||
2230 | if (zio->io_error == 0) { | |
2231 | ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); | |
2232 | ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); | |
2233 | ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); | |
2234 | if (ddp->ddp_phys_birth != 0) | |
2235 | ddt_phys_free(ddt, ddk, ddp, zio->io_txg); | |
2236 | ddt_phys_fill(ddp, bp); | |
2237 | } | |
2238 | ||
2239 | ddt_exit(ddt); | |
2240 | } | |
2241 | ||
2242 | static int | |
2243 | zio_ddt_write(zio_t *zio) | |
2244 | { | |
2245 | spa_t *spa = zio->io_spa; | |
2246 | blkptr_t *bp = zio->io_bp; | |
2247 | uint64_t txg = zio->io_txg; | |
2248 | zio_prop_t *zp = &zio->io_prop; | |
2249 | int p = zp->zp_copies; | |
2250 | int ditto_copies; | |
2251 | zio_t *cio = NULL; | |
2252 | zio_t *dio = NULL; | |
2253 | ddt_t *ddt = ddt_select(spa, bp); | |
2254 | ddt_entry_t *dde; | |
2255 | ddt_phys_t *ddp; | |
2256 | ||
2257 | ASSERT(BP_GET_DEDUP(bp)); | |
2258 | ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); | |
2259 | ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); | |
2260 | ||
2261 | ddt_enter(ddt); | |
2262 | dde = ddt_lookup(ddt, bp, B_TRUE); | |
2263 | ddp = &dde->dde_phys[p]; | |
2264 | ||
2265 | if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { | |
2266 | /* | |
2267 | * If we're using a weak checksum, upgrade to a strong checksum | |
2268 | * and try again. If we're already using a strong checksum, | |
2269 | * we can't resolve it, so just convert to an ordinary write. | |
2270 | * (And automatically e-mail a paper to Nature?) | |
2271 | */ | |
2272 | if (!zio_checksum_table[zp->zp_checksum].ci_dedup) { | |
2273 | zp->zp_checksum = spa_dedup_checksum(spa); | |
2274 | zio_pop_transforms(zio); | |
2275 | zio->io_stage = ZIO_STAGE_OPEN; | |
2276 | BP_ZERO(bp); | |
2277 | } else { | |
03c6040b | 2278 | zp->zp_dedup = B_FALSE; |
428870ff BB |
2279 | } |
2280 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
2281 | ddt_exit(ddt); | |
2282 | return (ZIO_PIPELINE_CONTINUE); | |
2283 | } | |
2284 | ||
2285 | ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); | |
2286 | ASSERT(ditto_copies < SPA_DVAS_PER_BP); | |
2287 | ||
2288 | if (ditto_copies > ddt_ditto_copies_present(dde) && | |
2289 | dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { | |
2290 | zio_prop_t czp = *zp; | |
2291 | ||
2292 | czp.zp_copies = ditto_copies; | |
2293 | ||
2294 | /* | |
2295 | * If we arrived here with an override bp, we won't have run | |
2296 | * the transform stack, so we won't have the data we need to | |
2297 | * generate a child i/o. So, toss the override bp and restart. | |
2298 | * This is safe, because using the override bp is just an | |
2299 | * optimization; and it's rare, so the cost doesn't matter. | |
2300 | */ | |
2301 | if (zio->io_bp_override) { | |
2302 | zio_pop_transforms(zio); | |
2303 | zio->io_stage = ZIO_STAGE_OPEN; | |
2304 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
2305 | zio->io_bp_override = NULL; | |
2306 | BP_ZERO(bp); | |
2307 | ddt_exit(ddt); | |
2308 | return (ZIO_PIPELINE_CONTINUE); | |
2309 | } | |
2310 | ||
2311 | dio = zio_write(zio, spa, txg, bp, zio->io_orig_data, | |
e8b96c60 | 2312 | zio->io_orig_size, &czp, NULL, NULL, |
428870ff BB |
2313 | zio_ddt_ditto_write_done, dde, zio->io_priority, |
2314 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); | |
2315 | ||
2316 | zio_push_transform(dio, zio->io_data, zio->io_size, 0, NULL); | |
2317 | dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; | |
2318 | } | |
2319 | ||
2320 | if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { | |
2321 | if (ddp->ddp_phys_birth != 0) | |
2322 | ddt_bp_fill(ddp, bp, txg); | |
2323 | if (dde->dde_lead_zio[p] != NULL) | |
2324 | zio_add_child(zio, dde->dde_lead_zio[p]); | |
2325 | else | |
2326 | ddt_phys_addref(ddp); | |
2327 | } else if (zio->io_bp_override) { | |
2328 | ASSERT(bp->blk_birth == txg); | |
2329 | ASSERT(BP_EQUAL(bp, zio->io_bp_override)); | |
2330 | ddt_phys_fill(ddp, bp); | |
2331 | ddt_phys_addref(ddp); | |
2332 | } else { | |
2333 | cio = zio_write(zio, spa, txg, bp, zio->io_orig_data, | |
e8b96c60 | 2334 | zio->io_orig_size, zp, zio_ddt_child_write_ready, NULL, |
428870ff BB |
2335 | zio_ddt_child_write_done, dde, zio->io_priority, |
2336 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); | |
2337 | ||
2338 | zio_push_transform(cio, zio->io_data, zio->io_size, 0, NULL); | |
2339 | dde->dde_lead_zio[p] = cio; | |
2340 | } | |
2341 | ||
2342 | ddt_exit(ddt); | |
2343 | ||
2344 | if (cio) | |
2345 | zio_nowait(cio); | |
2346 | if (dio) | |
2347 | zio_nowait(dio); | |
2348 | ||
2349 | return (ZIO_PIPELINE_CONTINUE); | |
2350 | } | |
2351 | ||
2352 | ddt_entry_t *freedde; /* for debugging */ | |
b128c09f | 2353 | |
428870ff BB |
2354 | static int |
2355 | zio_ddt_free(zio_t *zio) | |
2356 | { | |
2357 | spa_t *spa = zio->io_spa; | |
2358 | blkptr_t *bp = zio->io_bp; | |
2359 | ddt_t *ddt = ddt_select(spa, bp); | |
2360 | ddt_entry_t *dde; | |
2361 | ddt_phys_t *ddp; | |
2362 | ||
2363 | ASSERT(BP_GET_DEDUP(bp)); | |
2364 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
2365 | ||
2366 | ddt_enter(ddt); | |
2367 | freedde = dde = ddt_lookup(ddt, bp, B_TRUE); | |
5dc6af0e BB |
2368 | if (dde) { |
2369 | ddp = ddt_phys_select(dde, bp); | |
2370 | if (ddp) | |
2371 | ddt_phys_decref(ddp); | |
2372 | } | |
428870ff BB |
2373 | ddt_exit(ddt); |
2374 | ||
2375 | return (ZIO_PIPELINE_CONTINUE); | |
2376 | } | |
2377 | ||
2378 | /* | |
2379 | * ========================================================================== | |
2380 | * Allocate and free blocks | |
2381 | * ========================================================================== | |
2382 | */ | |
34dc7c2f BB |
2383 | static int |
2384 | zio_dva_allocate(zio_t *zio) | |
2385 | { | |
2386 | spa_t *spa = zio->io_spa; | |
428870ff | 2387 | metaslab_class_t *mc = spa_normal_class(spa); |
34dc7c2f BB |
2388 | blkptr_t *bp = zio->io_bp; |
2389 | int error; | |
6d974228 | 2390 | int flags = 0; |
34dc7c2f | 2391 | |
9babb374 BB |
2392 | if (zio->io_gang_leader == NULL) { |
2393 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
2394 | zio->io_gang_leader = zio; | |
2395 | } | |
2396 | ||
34dc7c2f | 2397 | ASSERT(BP_IS_HOLE(bp)); |
c99c9001 | 2398 | ASSERT0(BP_GET_NDVAS(bp)); |
428870ff BB |
2399 | ASSERT3U(zio->io_prop.zp_copies, >, 0); |
2400 | ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); | |
34dc7c2f BB |
2401 | ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); |
2402 | ||
6d974228 GW |
2403 | /* |
2404 | * The dump device does not support gang blocks so allocation on | |
2405 | * behalf of the dump device (i.e. ZIO_FLAG_NODATA) must avoid | |
2406 | * the "fast" gang feature. | |
2407 | */ | |
2408 | flags |= (zio->io_flags & ZIO_FLAG_NODATA) ? METASLAB_GANG_AVOID : 0; | |
2409 | flags |= (zio->io_flags & ZIO_FLAG_GANG_CHILD) ? | |
2410 | METASLAB_GANG_CHILD : 0; | |
920dd524 | 2411 | flags |= (zio->io_flags & ZIO_FLAG_FASTWRITE) ? METASLAB_FASTWRITE : 0; |
b128c09f | 2412 | error = metaslab_alloc(spa, mc, zio->io_size, bp, |
6d974228 | 2413 | zio->io_prop.zp_copies, zio->io_txg, NULL, flags); |
34dc7c2f | 2414 | |
b128c09f | 2415 | if (error) { |
6d974228 GW |
2416 | spa_dbgmsg(spa, "%s: metaslab allocation failure: zio %p, " |
2417 | "size %llu, error %d", spa_name(spa), zio, zio->io_size, | |
2418 | error); | |
b128c09f BB |
2419 | if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) |
2420 | return (zio_write_gang_block(zio)); | |
34dc7c2f BB |
2421 | zio->io_error = error; |
2422 | } | |
2423 | ||
2424 | return (ZIO_PIPELINE_CONTINUE); | |
2425 | } | |
2426 | ||
2427 | static int | |
2428 | zio_dva_free(zio_t *zio) | |
2429 | { | |
b128c09f | 2430 | metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); |
34dc7c2f BB |
2431 | |
2432 | return (ZIO_PIPELINE_CONTINUE); | |
2433 | } | |
2434 | ||
2435 | static int | |
2436 | zio_dva_claim(zio_t *zio) | |
2437 | { | |
b128c09f BB |
2438 | int error; |
2439 | ||
2440 | error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); | |
2441 | if (error) | |
2442 | zio->io_error = error; | |
34dc7c2f BB |
2443 | |
2444 | return (ZIO_PIPELINE_CONTINUE); | |
2445 | } | |
2446 | ||
b128c09f BB |
2447 | /* |
2448 | * Undo an allocation. This is used by zio_done() when an I/O fails | |
2449 | * and we want to give back the block we just allocated. | |
2450 | * This handles both normal blocks and gang blocks. | |
2451 | */ | |
2452 | static void | |
2453 | zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) | |
2454 | { | |
d6320ddb BB |
2455 | int g; |
2456 | ||
b128c09f | 2457 | ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); |
428870ff | 2458 | ASSERT(zio->io_bp_override == NULL); |
b128c09f BB |
2459 | |
2460 | if (!BP_IS_HOLE(bp)) | |
428870ff | 2461 | metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); |
b128c09f BB |
2462 | |
2463 | if (gn != NULL) { | |
d6320ddb | 2464 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
2465 | zio_dva_unallocate(zio, gn->gn_child[g], |
2466 | &gn->gn_gbh->zg_blkptr[g]); | |
2467 | } | |
2468 | } | |
2469 | } | |
2470 | ||
2471 | /* | |
2472 | * Try to allocate an intent log block. Return 0 on success, errno on failure. | |
2473 | */ | |
2474 | int | |
920dd524 ED |
2475 | zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, uint64_t size, |
2476 | boolean_t use_slog) | |
b128c09f | 2477 | { |
428870ff | 2478 | int error = 1; |
b128c09f | 2479 | |
428870ff BB |
2480 | ASSERT(txg > spa_syncing_txg(spa)); |
2481 | ||
ebf8e3a2 BB |
2482 | /* |
2483 | * ZIL blocks are always contiguous (i.e. not gang blocks) so we | |
2484 | * set the METASLAB_GANG_AVOID flag so that they don't "fast gang" | |
2485 | * when allocating them. | |
2486 | */ | |
2487 | if (use_slog) { | |
428870ff | 2488 | error = metaslab_alloc(spa, spa_log_class(spa), size, |
920dd524 ED |
2489 | new_bp, 1, txg, NULL, |
2490 | METASLAB_FASTWRITE | METASLAB_GANG_AVOID); | |
ebf8e3a2 | 2491 | } |
b128c09f | 2492 | |
ebf8e3a2 | 2493 | if (error) { |
428870ff | 2494 | error = metaslab_alloc(spa, spa_normal_class(spa), size, |
920dd524 | 2495 | new_bp, 1, txg, NULL, |
ac72fac3 | 2496 | METASLAB_FASTWRITE); |
ebf8e3a2 | 2497 | } |
b128c09f BB |
2498 | |
2499 | if (error == 0) { | |
2500 | BP_SET_LSIZE(new_bp, size); | |
2501 | BP_SET_PSIZE(new_bp, size); | |
2502 | BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); | |
428870ff BB |
2503 | BP_SET_CHECKSUM(new_bp, |
2504 | spa_version(spa) >= SPA_VERSION_SLIM_ZIL | |
2505 | ? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG); | |
b128c09f BB |
2506 | BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); |
2507 | BP_SET_LEVEL(new_bp, 0); | |
428870ff | 2508 | BP_SET_DEDUP(new_bp, 0); |
b128c09f BB |
2509 | BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); |
2510 | } | |
2511 | ||
2512 | return (error); | |
2513 | } | |
2514 | ||
2515 | /* | |
428870ff | 2516 | * Free an intent log block. |
b128c09f BB |
2517 | */ |
2518 | void | |
428870ff | 2519 | zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp) |
b128c09f | 2520 | { |
428870ff | 2521 | ASSERT(BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG); |
b128c09f BB |
2522 | ASSERT(!BP_IS_GANG(bp)); |
2523 | ||
428870ff | 2524 | zio_free(spa, txg, bp); |
b128c09f BB |
2525 | } |
2526 | ||
34dc7c2f BB |
2527 | /* |
2528 | * ========================================================================== | |
2529 | * Read and write to physical devices | |
2530 | * ========================================================================== | |
2531 | */ | |
98b25418 GW |
2532 | |
2533 | ||
2534 | /* | |
2535 | * Issue an I/O to the underlying vdev. Typically the issue pipeline | |
2536 | * stops after this stage and will resume upon I/O completion. | |
2537 | * However, there are instances where the vdev layer may need to | |
2538 | * continue the pipeline when an I/O was not issued. Since the I/O | |
2539 | * that was sent to the vdev layer might be different than the one | |
2540 | * currently active in the pipeline (see vdev_queue_io()), we explicitly | |
2541 | * force the underlying vdev layers to call either zio_execute() or | |
2542 | * zio_interrupt() to ensure that the pipeline continues with the correct I/O. | |
2543 | */ | |
34dc7c2f BB |
2544 | static int |
2545 | zio_vdev_io_start(zio_t *zio) | |
2546 | { | |
2547 | vdev_t *vd = zio->io_vd; | |
34dc7c2f BB |
2548 | uint64_t align; |
2549 | spa_t *spa = zio->io_spa; | |
2550 | ||
b128c09f BB |
2551 | ASSERT(zio->io_error == 0); |
2552 | ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); | |
34dc7c2f | 2553 | |
b128c09f BB |
2554 | if (vd == NULL) { |
2555 | if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) | |
2556 | spa_config_enter(spa, SCL_ZIO, zio, RW_READER); | |
34dc7c2f | 2557 | |
b128c09f BB |
2558 | /* |
2559 | * The mirror_ops handle multiple DVAs in a single BP. | |
2560 | */ | |
98b25418 GW |
2561 | vdev_mirror_ops.vdev_op_io_start(zio); |
2562 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
2563 | } |
2564 | ||
572e2857 BB |
2565 | /* |
2566 | * We keep track of time-sensitive I/Os so that the scan thread | |
2567 | * can quickly react to certain workloads. In particular, we care | |
2568 | * about non-scrubbing, top-level reads and writes with the following | |
2569 | * characteristics: | |
98b25418 | 2570 | * - synchronous writes of user data to non-slog devices |
572e2857 BB |
2571 | * - any reads of user data |
2572 | * When these conditions are met, adjust the timestamp of spa_last_io | |
2573 | * which allows the scan thread to adjust its workload accordingly. | |
2574 | */ | |
2575 | if (!(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && zio->io_bp != NULL && | |
2576 | vd == vd->vdev_top && !vd->vdev_islog && | |
2577 | zio->io_bookmark.zb_objset != DMU_META_OBJSET && | |
2578 | zio->io_txg != spa_syncing_txg(spa)) { | |
2579 | uint64_t old = spa->spa_last_io; | |
2580 | uint64_t new = ddi_get_lbolt64(); | |
2581 | if (old != new) | |
2582 | (void) atomic_cas_64(&spa->spa_last_io, old, new); | |
2583 | } | |
2584 | ||
b128c09f BB |
2585 | align = 1ULL << vd->vdev_top->vdev_ashift; |
2586 | ||
b02fe35d AR |
2587 | if (!(zio->io_flags & ZIO_FLAG_PHYSICAL) && |
2588 | P2PHASE(zio->io_size, align) != 0) { | |
2589 | /* Transform logical writes to be a full physical block size. */ | |
34dc7c2f BB |
2590 | uint64_t asize = P2ROUNDUP(zio->io_size, align); |
2591 | char *abuf = zio_buf_alloc(asize); | |
178e73b3 | 2592 | ASSERT(vd == vd->vdev_top); |
34dc7c2f BB |
2593 | if (zio->io_type == ZIO_TYPE_WRITE) { |
2594 | bcopy(zio->io_data, abuf, zio->io_size); | |
2595 | bzero(abuf + zio->io_size, asize - zio->io_size); | |
2596 | } | |
b128c09f | 2597 | zio_push_transform(zio, abuf, asize, asize, zio_subblock); |
34dc7c2f BB |
2598 | } |
2599 | ||
b02fe35d AR |
2600 | /* |
2601 | * If this is not a physical io, make sure that it is properly aligned | |
2602 | * before proceeding. | |
2603 | */ | |
2604 | if (!(zio->io_flags & ZIO_FLAG_PHYSICAL)) { | |
2605 | ASSERT0(P2PHASE(zio->io_offset, align)); | |
2606 | ASSERT0(P2PHASE(zio->io_size, align)); | |
2607 | } else { | |
2608 | /* | |
2609 | * For physical writes, we allow 512b aligned writes and assume | |
2610 | * the device will perform a read-modify-write as necessary. | |
2611 | */ | |
2612 | ASSERT0(P2PHASE(zio->io_offset, SPA_MINBLOCKSIZE)); | |
2613 | ASSERT0(P2PHASE(zio->io_size, SPA_MINBLOCKSIZE)); | |
2614 | } | |
2615 | ||
572e2857 | 2616 | VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); |
fb5f0bc8 BB |
2617 | |
2618 | /* | |
2619 | * If this is a repair I/O, and there's no self-healing involved -- | |
2620 | * that is, we're just resilvering what we expect to resilver -- | |
2621 | * then don't do the I/O unless zio's txg is actually in vd's DTL. | |
2622 | * This prevents spurious resilvering with nested replication. | |
2623 | * For example, given a mirror of mirrors, (A+B)+(C+D), if only | |
2624 | * A is out of date, we'll read from C+D, then use the data to | |
2625 | * resilver A+B -- but we don't actually want to resilver B, just A. | |
2626 | * The top-level mirror has no way to know this, so instead we just | |
2627 | * discard unnecessary repairs as we work our way down the vdev tree. | |
2628 | * The same logic applies to any form of nested replication: | |
2629 | * ditto + mirror, RAID-Z + replacing, etc. This covers them all. | |
2630 | */ | |
2631 | if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && | |
2632 | !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && | |
2633 | zio->io_txg != 0 && /* not a delegated i/o */ | |
2634 | !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { | |
2635 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); | |
fb5f0bc8 BB |
2636 | zio_vdev_io_bypass(zio); |
2637 | return (ZIO_PIPELINE_CONTINUE); | |
2638 | } | |
34dc7c2f | 2639 | |
b128c09f BB |
2640 | if (vd->vdev_ops->vdev_op_leaf && |
2641 | (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { | |
2642 | ||
b0bc7a84 | 2643 | if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio)) |
d164b209 | 2644 | return (ZIO_PIPELINE_CONTINUE); |
b128c09f BB |
2645 | |
2646 | if ((zio = vdev_queue_io(zio)) == NULL) | |
2647 | return (ZIO_PIPELINE_STOP); | |
2648 | ||
2649 | if (!vdev_accessible(vd, zio)) { | |
2e528b49 | 2650 | zio->io_error = SET_ERROR(ENXIO); |
b128c09f BB |
2651 | zio_interrupt(zio); |
2652 | return (ZIO_PIPELINE_STOP); | |
2653 | } | |
b128c09f BB |
2654 | } |
2655 | ||
98b25418 GW |
2656 | vd->vdev_ops->vdev_op_io_start(zio); |
2657 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
2658 | } |
2659 | ||
2660 | static int | |
2661 | zio_vdev_io_done(zio_t *zio) | |
2662 | { | |
b128c09f BB |
2663 | vdev_t *vd = zio->io_vd; |
2664 | vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; | |
2665 | boolean_t unexpected_error = B_FALSE; | |
34dc7c2f | 2666 | |
b128c09f BB |
2667 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) |
2668 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 2669 | |
b128c09f BB |
2670 | ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); |
2671 | ||
2672 | if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { | |
2673 | ||
2674 | vdev_queue_io_done(zio); | |
2675 | ||
2676 | if (zio->io_type == ZIO_TYPE_WRITE) | |
2677 | vdev_cache_write(zio); | |
2678 | ||
2679 | if (zio_injection_enabled && zio->io_error == 0) | |
9babb374 BB |
2680 | zio->io_error = zio_handle_device_injection(vd, |
2681 | zio, EIO); | |
b128c09f BB |
2682 | |
2683 | if (zio_injection_enabled && zio->io_error == 0) | |
2684 | zio->io_error = zio_handle_label_injection(zio, EIO); | |
2685 | ||
2686 | if (zio->io_error) { | |
2687 | if (!vdev_accessible(vd, zio)) { | |
2e528b49 | 2688 | zio->io_error = SET_ERROR(ENXIO); |
b128c09f BB |
2689 | } else { |
2690 | unexpected_error = B_TRUE; | |
2691 | } | |
2692 | } | |
2693 | } | |
2694 | ||
2695 | ops->vdev_op_io_done(zio); | |
34dc7c2f | 2696 | |
b128c09f | 2697 | if (unexpected_error) |
d164b209 | 2698 | VERIFY(vdev_probe(vd, zio) == NULL); |
34dc7c2f | 2699 | |
b128c09f | 2700 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
2701 | } |
2702 | ||
428870ff BB |
2703 | /* |
2704 | * For non-raidz ZIOs, we can just copy aside the bad data read from the | |
2705 | * disk, and use that to finish the checksum ereport later. | |
2706 | */ | |
2707 | static void | |
2708 | zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, | |
2709 | const void *good_buf) | |
2710 | { | |
2711 | /* no processing needed */ | |
2712 | zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); | |
2713 | } | |
2714 | ||
2715 | /*ARGSUSED*/ | |
2716 | void | |
2717 | zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) | |
2718 | { | |
2719 | void *buf = zio_buf_alloc(zio->io_size); | |
2720 | ||
2721 | bcopy(zio->io_data, buf, zio->io_size); | |
2722 | ||
2723 | zcr->zcr_cbinfo = zio->io_size; | |
2724 | zcr->zcr_cbdata = buf; | |
2725 | zcr->zcr_finish = zio_vsd_default_cksum_finish; | |
2726 | zcr->zcr_free = zio_buf_free; | |
2727 | } | |
2728 | ||
34dc7c2f BB |
2729 | static int |
2730 | zio_vdev_io_assess(zio_t *zio) | |
2731 | { | |
2732 | vdev_t *vd = zio->io_vd; | |
b128c09f BB |
2733 | |
2734 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) | |
2735 | return (ZIO_PIPELINE_STOP); | |
2736 | ||
2737 | if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) | |
2738 | spa_config_exit(zio->io_spa, SCL_ZIO, zio); | |
2739 | ||
2740 | if (zio->io_vsd != NULL) { | |
428870ff | 2741 | zio->io_vsd_ops->vsd_free(zio); |
b128c09f | 2742 | zio->io_vsd = NULL; |
34dc7c2f BB |
2743 | } |
2744 | ||
b128c09f | 2745 | if (zio_injection_enabled && zio->io_error == 0) |
34dc7c2f BB |
2746 | zio->io_error = zio_handle_fault_injection(zio, EIO); |
2747 | ||
2748 | /* | |
2749 | * If the I/O failed, determine whether we should attempt to retry it. | |
428870ff BB |
2750 | * |
2751 | * On retry, we cut in line in the issue queue, since we don't want | |
2752 | * compression/checksumming/etc. work to prevent our (cheap) IO reissue. | |
34dc7c2f | 2753 | */ |
b128c09f BB |
2754 | if (zio->io_error && vd == NULL && |
2755 | !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { | |
2756 | ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ | |
2757 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ | |
34dc7c2f | 2758 | zio->io_error = 0; |
b128c09f BB |
2759 | zio->io_flags |= ZIO_FLAG_IO_RETRY | |
2760 | ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; | |
428870ff BB |
2761 | zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; |
2762 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, | |
2763 | zio_requeue_io_start_cut_in_line); | |
b128c09f | 2764 | return (ZIO_PIPELINE_STOP); |
34dc7c2f BB |
2765 | } |
2766 | ||
b128c09f BB |
2767 | /* |
2768 | * If we got an error on a leaf device, convert it to ENXIO | |
2769 | * if the device is not accessible at all. | |
2770 | */ | |
2771 | if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && | |
2772 | !vdev_accessible(vd, zio)) | |
2e528b49 | 2773 | zio->io_error = SET_ERROR(ENXIO); |
b128c09f BB |
2774 | |
2775 | /* | |
2776 | * If we can't write to an interior vdev (mirror or RAID-Z), | |
2777 | * set vdev_cant_write so that we stop trying to allocate from it. | |
2778 | */ | |
2779 | if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && | |
13fe0198 | 2780 | vd != NULL && !vd->vdev_ops->vdev_op_leaf) { |
b128c09f | 2781 | vd->vdev_cant_write = B_TRUE; |
13fe0198 | 2782 | } |
b128c09f BB |
2783 | |
2784 | if (zio->io_error) | |
2785 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
2786 | ||
e8b96c60 MA |
2787 | if (vd != NULL && vd->vdev_ops->vdev_op_leaf && |
2788 | zio->io_physdone != NULL) { | |
2789 | ASSERT(!(zio->io_flags & ZIO_FLAG_DELEGATED)); | |
2790 | ASSERT(zio->io_child_type == ZIO_CHILD_VDEV); | |
2791 | zio->io_physdone(zio->io_logical); | |
2792 | } | |
2793 | ||
34dc7c2f BB |
2794 | return (ZIO_PIPELINE_CONTINUE); |
2795 | } | |
2796 | ||
2797 | void | |
2798 | zio_vdev_io_reissue(zio_t *zio) | |
2799 | { | |
2800 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); | |
2801 | ASSERT(zio->io_error == 0); | |
2802 | ||
428870ff | 2803 | zio->io_stage >>= 1; |
34dc7c2f BB |
2804 | } |
2805 | ||
2806 | void | |
2807 | zio_vdev_io_redone(zio_t *zio) | |
2808 | { | |
2809 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); | |
2810 | ||
428870ff | 2811 | zio->io_stage >>= 1; |
34dc7c2f BB |
2812 | } |
2813 | ||
2814 | void | |
2815 | zio_vdev_io_bypass(zio_t *zio) | |
2816 | { | |
2817 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); | |
2818 | ASSERT(zio->io_error == 0); | |
2819 | ||
2820 | zio->io_flags |= ZIO_FLAG_IO_BYPASS; | |
428870ff | 2821 | zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; |
34dc7c2f BB |
2822 | } |
2823 | ||
2824 | /* | |
2825 | * ========================================================================== | |
2826 | * Generate and verify checksums | |
2827 | * ========================================================================== | |
2828 | */ | |
2829 | static int | |
2830 | zio_checksum_generate(zio_t *zio) | |
2831 | { | |
34dc7c2f | 2832 | blkptr_t *bp = zio->io_bp; |
b128c09f | 2833 | enum zio_checksum checksum; |
34dc7c2f | 2834 | |
b128c09f BB |
2835 | if (bp == NULL) { |
2836 | /* | |
2837 | * This is zio_write_phys(). | |
2838 | * We're either generating a label checksum, or none at all. | |
2839 | */ | |
2840 | checksum = zio->io_prop.zp_checksum; | |
34dc7c2f | 2841 | |
b128c09f BB |
2842 | if (checksum == ZIO_CHECKSUM_OFF) |
2843 | return (ZIO_PIPELINE_CONTINUE); | |
2844 | ||
2845 | ASSERT(checksum == ZIO_CHECKSUM_LABEL); | |
2846 | } else { | |
2847 | if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { | |
2848 | ASSERT(!IO_IS_ALLOCATING(zio)); | |
2849 | checksum = ZIO_CHECKSUM_GANG_HEADER; | |
2850 | } else { | |
2851 | checksum = BP_GET_CHECKSUM(bp); | |
2852 | } | |
2853 | } | |
34dc7c2f | 2854 | |
b128c09f | 2855 | zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); |
34dc7c2f BB |
2856 | |
2857 | return (ZIO_PIPELINE_CONTINUE); | |
2858 | } | |
2859 | ||
2860 | static int | |
b128c09f | 2861 | zio_checksum_verify(zio_t *zio) |
34dc7c2f | 2862 | { |
428870ff | 2863 | zio_bad_cksum_t info; |
b128c09f BB |
2864 | blkptr_t *bp = zio->io_bp; |
2865 | int error; | |
34dc7c2f | 2866 | |
428870ff BB |
2867 | ASSERT(zio->io_vd != NULL); |
2868 | ||
b128c09f BB |
2869 | if (bp == NULL) { |
2870 | /* | |
2871 | * This is zio_read_phys(). | |
2872 | * We're either verifying a label checksum, or nothing at all. | |
2873 | */ | |
2874 | if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) | |
2875 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f | 2876 | |
b128c09f BB |
2877 | ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); |
2878 | } | |
34dc7c2f | 2879 | |
428870ff | 2880 | if ((error = zio_checksum_error(zio, &info)) != 0) { |
b128c09f | 2881 | zio->io_error = error; |
7a3066ff MA |
2882 | if (error == ECKSUM && |
2883 | !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { | |
428870ff BB |
2884 | zfs_ereport_start_checksum(zio->io_spa, |
2885 | zio->io_vd, zio, zio->io_offset, | |
2886 | zio->io_size, NULL, &info); | |
b128c09f | 2887 | } |
34dc7c2f BB |
2888 | } |
2889 | ||
2890 | return (ZIO_PIPELINE_CONTINUE); | |
2891 | } | |
2892 | ||
2893 | /* | |
2894 | * Called by RAID-Z to ensure we don't compute the checksum twice. | |
2895 | */ | |
2896 | void | |
2897 | zio_checksum_verified(zio_t *zio) | |
2898 | { | |
428870ff | 2899 | zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; |
34dc7c2f BB |
2900 | } |
2901 | ||
2902 | /* | |
b128c09f BB |
2903 | * ========================================================================== |
2904 | * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. | |
9b67f605 | 2905 | * An error of 0 indicates success. ENXIO indicates whole-device failure, |
b128c09f BB |
2906 | * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO |
2907 | * indicate errors that are specific to one I/O, and most likely permanent. | |
2908 | * Any other error is presumed to be worse because we weren't expecting it. | |
2909 | * ========================================================================== | |
34dc7c2f | 2910 | */ |
b128c09f BB |
2911 | int |
2912 | zio_worst_error(int e1, int e2) | |
34dc7c2f | 2913 | { |
b128c09f BB |
2914 | static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; |
2915 | int r1, r2; | |
2916 | ||
2917 | for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) | |
2918 | if (e1 == zio_error_rank[r1]) | |
2919 | break; | |
34dc7c2f | 2920 | |
b128c09f BB |
2921 | for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) |
2922 | if (e2 == zio_error_rank[r2]) | |
2923 | break; | |
2924 | ||
2925 | return (r1 > r2 ? e1 : e2); | |
34dc7c2f BB |
2926 | } |
2927 | ||
2928 | /* | |
2929 | * ========================================================================== | |
b128c09f | 2930 | * I/O completion |
34dc7c2f BB |
2931 | * ========================================================================== |
2932 | */ | |
b128c09f BB |
2933 | static int |
2934 | zio_ready(zio_t *zio) | |
34dc7c2f | 2935 | { |
b128c09f | 2936 | blkptr_t *bp = zio->io_bp; |
d164b209 | 2937 | zio_t *pio, *pio_next; |
34dc7c2f | 2938 | |
428870ff BB |
2939 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || |
2940 | zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_READY)) | |
9babb374 | 2941 | return (ZIO_PIPELINE_STOP); |
34dc7c2f | 2942 | |
9babb374 | 2943 | if (zio->io_ready) { |
b128c09f | 2944 | ASSERT(IO_IS_ALLOCATING(zio)); |
03c6040b GW |
2945 | ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp) || |
2946 | (zio->io_flags & ZIO_FLAG_NOPWRITE)); | |
b128c09f | 2947 | ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); |
34dc7c2f | 2948 | |
b128c09f BB |
2949 | zio->io_ready(zio); |
2950 | } | |
34dc7c2f | 2951 | |
b128c09f BB |
2952 | if (bp != NULL && bp != &zio->io_bp_copy) |
2953 | zio->io_bp_copy = *bp; | |
34dc7c2f | 2954 | |
b128c09f BB |
2955 | if (zio->io_error) |
2956 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
34dc7c2f | 2957 | |
d164b209 BB |
2958 | mutex_enter(&zio->io_lock); |
2959 | zio->io_state[ZIO_WAIT_READY] = 1; | |
2960 | pio = zio_walk_parents(zio); | |
2961 | mutex_exit(&zio->io_lock); | |
2962 | ||
2963 | /* | |
2964 | * As we notify zio's parents, new parents could be added. | |
2965 | * New parents go to the head of zio's io_parent_list, however, | |
2966 | * so we will (correctly) not notify them. The remainder of zio's | |
2967 | * io_parent_list, from 'pio_next' onward, cannot change because | |
2968 | * all parents must wait for us to be done before they can be done. | |
2969 | */ | |
2970 | for (; pio != NULL; pio = pio_next) { | |
2971 | pio_next = zio_walk_parents(zio); | |
b128c09f | 2972 | zio_notify_parent(pio, zio, ZIO_WAIT_READY); |
d164b209 | 2973 | } |
34dc7c2f | 2974 | |
428870ff BB |
2975 | if (zio->io_flags & ZIO_FLAG_NODATA) { |
2976 | if (BP_IS_GANG(bp)) { | |
2977 | zio->io_flags &= ~ZIO_FLAG_NODATA; | |
2978 | } else { | |
2979 | ASSERT((uintptr_t)zio->io_data < SPA_MAXBLOCKSIZE); | |
2980 | zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; | |
2981 | } | |
2982 | } | |
2983 | ||
2984 | if (zio_injection_enabled && | |
2985 | zio->io_spa->spa_syncing_txg == zio->io_txg) | |
2986 | zio_handle_ignored_writes(zio); | |
2987 | ||
b128c09f | 2988 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
2989 | } |
2990 | ||
b128c09f BB |
2991 | static int |
2992 | zio_done(zio_t *zio) | |
34dc7c2f | 2993 | { |
d164b209 | 2994 | zio_t *pio, *pio_next; |
d6320ddb | 2995 | int c, w; |
34dc7c2f | 2996 | |
b128c09f | 2997 | /* |
9babb374 | 2998 | * If our children haven't all completed, |
b128c09f BB |
2999 | * wait for them and then repeat this pipeline stage. |
3000 | */ | |
3001 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || | |
3002 | zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || | |
428870ff | 3003 | zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE) || |
b128c09f BB |
3004 | zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) |
3005 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 3006 | |
d6320ddb BB |
3007 | for (c = 0; c < ZIO_CHILD_TYPES; c++) |
3008 | for (w = 0; w < ZIO_WAIT_TYPES; w++) | |
b128c09f BB |
3009 | ASSERT(zio->io_children[c][w] == 0); |
3010 | ||
9b67f605 | 3011 | if (zio->io_bp != NULL && !BP_IS_EMBEDDED(zio->io_bp)) { |
c776b317 BB |
3012 | ASSERT(zio->io_bp->blk_pad[0] == 0); |
3013 | ASSERT(zio->io_bp->blk_pad[1] == 0); | |
d1d7e268 MK |
3014 | ASSERT(bcmp(zio->io_bp, &zio->io_bp_copy, |
3015 | sizeof (blkptr_t)) == 0 || | |
c776b317 BB |
3016 | (zio->io_bp == zio_unique_parent(zio)->io_bp)); |
3017 | if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(zio->io_bp) && | |
428870ff | 3018 | zio->io_bp_override == NULL && |
b128c09f | 3019 | !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { |
c776b317 | 3020 | ASSERT(!BP_SHOULD_BYTESWAP(zio->io_bp)); |
d1d7e268 MK |
3021 | ASSERT3U(zio->io_prop.zp_copies, <=, |
3022 | BP_GET_NDVAS(zio->io_bp)); | |
c776b317 | 3023 | ASSERT(BP_COUNT_GANG(zio->io_bp) == 0 || |
d1d7e268 MK |
3024 | (BP_COUNT_GANG(zio->io_bp) == |
3025 | BP_GET_NDVAS(zio->io_bp))); | |
b128c09f | 3026 | } |
03c6040b GW |
3027 | if (zio->io_flags & ZIO_FLAG_NOPWRITE) |
3028 | VERIFY(BP_EQUAL(zio->io_bp, &zio->io_bp_orig)); | |
b128c09f BB |
3029 | } |
3030 | ||
3031 | /* | |
428870ff | 3032 | * If there were child vdev/gang/ddt errors, they apply to us now. |
b128c09f BB |
3033 | */ |
3034 | zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); | |
3035 | zio_inherit_child_errors(zio, ZIO_CHILD_GANG); | |
428870ff BB |
3036 | zio_inherit_child_errors(zio, ZIO_CHILD_DDT); |
3037 | ||
3038 | /* | |
3039 | * If the I/O on the transformed data was successful, generate any | |
3040 | * checksum reports now while we still have the transformed data. | |
3041 | */ | |
3042 | if (zio->io_error == 0) { | |
3043 | while (zio->io_cksum_report != NULL) { | |
3044 | zio_cksum_report_t *zcr = zio->io_cksum_report; | |
3045 | uint64_t align = zcr->zcr_align; | |
c776b317 | 3046 | uint64_t asize = P2ROUNDUP(zio->io_size, align); |
428870ff BB |
3047 | char *abuf = zio->io_data; |
3048 | ||
c776b317 | 3049 | if (asize != zio->io_size) { |
428870ff | 3050 | abuf = zio_buf_alloc(asize); |
c776b317 | 3051 | bcopy(zio->io_data, abuf, zio->io_size); |
d1d7e268 | 3052 | bzero(abuf+zio->io_size, asize-zio->io_size); |
428870ff BB |
3053 | } |
3054 | ||
3055 | zio->io_cksum_report = zcr->zcr_next; | |
3056 | zcr->zcr_next = NULL; | |
3057 | zcr->zcr_finish(zcr, abuf); | |
3058 | zfs_ereport_free_checksum(zcr); | |
3059 | ||
c776b317 | 3060 | if (asize != zio->io_size) |
428870ff BB |
3061 | zio_buf_free(abuf, asize); |
3062 | } | |
3063 | } | |
b128c09f BB |
3064 | |
3065 | zio_pop_transforms(zio); /* note: may set zio->io_error */ | |
3066 | ||
c776b317 | 3067 | vdev_stat_update(zio, zio->io_size); |
b128c09f | 3068 | |
a69052be | 3069 | /* |
cc92e9d0 | 3070 | * If this I/O is attached to a particular vdev is slow, exceeding |
72f53c56 MJ |
3071 | * 30 seconds to complete, post an error described the I/O delay. |
3072 | * We ignore these errors if the device is currently unavailable. | |
a69052be | 3073 | */ |
cc92e9d0 | 3074 | if (zio->io_delay >= MSEC_TO_TICK(zio_delay_max)) { |
72f53c56 MJ |
3075 | if (zio->io_vd != NULL && !vdev_is_dead(zio->io_vd)) |
3076 | zfs_ereport_post(FM_EREPORT_ZFS_DELAY, zio->io_spa, | |
d1d7e268 | 3077 | zio->io_vd, zio, 0, 0); |
72f53c56 | 3078 | } |
a69052be | 3079 | |
b128c09f BB |
3080 | if (zio->io_error) { |
3081 | /* | |
3082 | * If this I/O is attached to a particular vdev, | |
3083 | * generate an error message describing the I/O failure | |
3084 | * at the block level. We ignore these errors if the | |
3085 | * device is currently unavailable. | |
3086 | */ | |
c776b317 BB |
3087 | if (zio->io_error != ECKSUM && zio->io_vd != NULL && |
3088 | !vdev_is_dead(zio->io_vd)) | |
3089 | zfs_ereport_post(FM_EREPORT_ZFS_IO, zio->io_spa, | |
3090 | zio->io_vd, zio, 0, 0); | |
34dc7c2f | 3091 | |
428870ff BB |
3092 | if ((zio->io_error == EIO || !(zio->io_flags & |
3093 | (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && | |
c776b317 | 3094 | zio == zio->io_logical) { |
b128c09f BB |
3095 | /* |
3096 | * For logical I/O requests, tell the SPA to log the | |
3097 | * error and generate a logical data ereport. | |
3098 | */ | |
c776b317 | 3099 | spa_log_error(zio->io_spa, zio); |
d1d7e268 MK |
3100 | zfs_ereport_post(FM_EREPORT_ZFS_DATA, zio->io_spa, |
3101 | NULL, zio, 0, 0); | |
b128c09f BB |
3102 | } |
3103 | } | |
34dc7c2f | 3104 | |
c776b317 | 3105 | if (zio->io_error && zio == zio->io_logical) { |
b128c09f BB |
3106 | /* |
3107 | * Determine whether zio should be reexecuted. This will | |
3108 | * propagate all the way to the root via zio_notify_parent(). | |
3109 | */ | |
c776b317 | 3110 | ASSERT(zio->io_vd == NULL && zio->io_bp != NULL); |
428870ff | 3111 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); |
b128c09f | 3112 | |
428870ff BB |
3113 | if (IO_IS_ALLOCATING(zio) && |
3114 | !(zio->io_flags & ZIO_FLAG_CANFAIL)) { | |
b128c09f BB |
3115 | if (zio->io_error != ENOSPC) |
3116 | zio->io_reexecute |= ZIO_REEXECUTE_NOW; | |
3117 | else | |
3118 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
428870ff | 3119 | } |
b128c09f BB |
3120 | |
3121 | if ((zio->io_type == ZIO_TYPE_READ || | |
3122 | zio->io_type == ZIO_TYPE_FREE) && | |
572e2857 | 3123 | !(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && |
b128c09f | 3124 | zio->io_error == ENXIO && |
c776b317 BB |
3125 | spa_load_state(zio->io_spa) == SPA_LOAD_NONE && |
3126 | spa_get_failmode(zio->io_spa) != ZIO_FAILURE_MODE_CONTINUE) | |
b128c09f BB |
3127 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; |
3128 | ||
3129 | if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) | |
3130 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
428870ff BB |
3131 | |
3132 | /* | |
3133 | * Here is a possibly good place to attempt to do | |
3134 | * either combinatorial reconstruction or error correction | |
3135 | * based on checksums. It also might be a good place | |
3136 | * to send out preliminary ereports before we suspend | |
3137 | * processing. | |
3138 | */ | |
34dc7c2f BB |
3139 | } |
3140 | ||
3141 | /* | |
b128c09f BB |
3142 | * If there were logical child errors, they apply to us now. |
3143 | * We defer this until now to avoid conflating logical child | |
3144 | * errors with errors that happened to the zio itself when | |
3145 | * updating vdev stats and reporting FMA events above. | |
34dc7c2f | 3146 | */ |
b128c09f | 3147 | zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); |
34dc7c2f | 3148 | |
428870ff BB |
3149 | if ((zio->io_error || zio->io_reexecute) && |
3150 | IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && | |
03c6040b | 3151 | !(zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE))) |
c776b317 | 3152 | zio_dva_unallocate(zio, zio->io_gang_tree, zio->io_bp); |
9babb374 BB |
3153 | |
3154 | zio_gang_tree_free(&zio->io_gang_tree); | |
3155 | ||
3156 | /* | |
3157 | * Godfather I/Os should never suspend. | |
3158 | */ | |
3159 | if ((zio->io_flags & ZIO_FLAG_GODFATHER) && | |
3160 | (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) | |
3161 | zio->io_reexecute = 0; | |
3162 | ||
b128c09f BB |
3163 | if (zio->io_reexecute) { |
3164 | /* | |
3165 | * This is a logical I/O that wants to reexecute. | |
3166 | * | |
3167 | * Reexecute is top-down. When an i/o fails, if it's not | |
3168 | * the root, it simply notifies its parent and sticks around. | |
3169 | * The parent, seeing that it still has children in zio_done(), | |
3170 | * does the same. This percolates all the way up to the root. | |
3171 | * The root i/o will reexecute or suspend the entire tree. | |
3172 | * | |
3173 | * This approach ensures that zio_reexecute() honors | |
3174 | * all the original i/o dependency relationships, e.g. | |
3175 | * parents not executing until children are ready. | |
3176 | */ | |
3177 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
34dc7c2f | 3178 | |
9babb374 | 3179 | zio->io_gang_leader = NULL; |
b128c09f | 3180 | |
d164b209 BB |
3181 | mutex_enter(&zio->io_lock); |
3182 | zio->io_state[ZIO_WAIT_DONE] = 1; | |
3183 | mutex_exit(&zio->io_lock); | |
3184 | ||
9babb374 BB |
3185 | /* |
3186 | * "The Godfather" I/O monitors its children but is | |
3187 | * not a true parent to them. It will track them through | |
3188 | * the pipeline but severs its ties whenever they get into | |
3189 | * trouble (e.g. suspended). This allows "The Godfather" | |
3190 | * I/O to return status without blocking. | |
3191 | */ | |
3192 | for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { | |
3193 | zio_link_t *zl = zio->io_walk_link; | |
3194 | pio_next = zio_walk_parents(zio); | |
3195 | ||
3196 | if ((pio->io_flags & ZIO_FLAG_GODFATHER) && | |
3197 | (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { | |
3198 | zio_remove_child(pio, zio, zl); | |
3199 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); | |
3200 | } | |
3201 | } | |
3202 | ||
d164b209 | 3203 | if ((pio = zio_unique_parent(zio)) != NULL) { |
b128c09f BB |
3204 | /* |
3205 | * We're not a root i/o, so there's nothing to do | |
3206 | * but notify our parent. Don't propagate errors | |
3207 | * upward since we haven't permanently failed yet. | |
3208 | */ | |
9babb374 | 3209 | ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); |
b128c09f BB |
3210 | zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; |
3211 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); | |
3212 | } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { | |
3213 | /* | |
3214 | * We'd fail again if we reexecuted now, so suspend | |
3215 | * until conditions improve (e.g. device comes online). | |
3216 | */ | |
c776b317 | 3217 | zio_suspend(zio->io_spa, zio); |
b128c09f BB |
3218 | } else { |
3219 | /* | |
3220 | * Reexecution is potentially a huge amount of work. | |
3221 | * Hand it off to the otherwise-unused claim taskq. | |
3222 | */ | |
a38718a6 | 3223 | ASSERT(taskq_empty_ent(&zio->io_tqent)); |
7ef5e54e AL |
3224 | spa_taskq_dispatch_ent(zio->io_spa, |
3225 | ZIO_TYPE_CLAIM, ZIO_TASKQ_ISSUE, | |
a38718a6 GA |
3226 | (task_func_t *)zio_reexecute, zio, 0, |
3227 | &zio->io_tqent); | |
b128c09f BB |
3228 | } |
3229 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
3230 | } |
3231 | ||
428870ff | 3232 | ASSERT(zio->io_child_count == 0); |
b128c09f BB |
3233 | ASSERT(zio->io_reexecute == 0); |
3234 | ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); | |
34dc7c2f | 3235 | |
428870ff BB |
3236 | /* |
3237 | * Report any checksum errors, since the I/O is complete. | |
3238 | */ | |
3239 | while (zio->io_cksum_report != NULL) { | |
3240 | zio_cksum_report_t *zcr = zio->io_cksum_report; | |
3241 | zio->io_cksum_report = zcr->zcr_next; | |
3242 | zcr->zcr_next = NULL; | |
3243 | zcr->zcr_finish(zcr, NULL); | |
3244 | zfs_ereport_free_checksum(zcr); | |
3245 | } | |
3246 | ||
920dd524 | 3247 | if (zio->io_flags & ZIO_FLAG_FASTWRITE && zio->io_bp && |
9b67f605 MA |
3248 | !BP_IS_HOLE(zio->io_bp) && !BP_IS_EMBEDDED(zio->io_bp) && |
3249 | !(zio->io_flags & ZIO_FLAG_NOPWRITE)) { | |
920dd524 ED |
3250 | metaslab_fastwrite_unmark(zio->io_spa, zio->io_bp); |
3251 | } | |
3252 | ||
d164b209 BB |
3253 | /* |
3254 | * It is the responsibility of the done callback to ensure that this | |
3255 | * particular zio is no longer discoverable for adoption, and as | |
3256 | * such, cannot acquire any new parents. | |
3257 | */ | |
b128c09f BB |
3258 | if (zio->io_done) |
3259 | zio->io_done(zio); | |
34dc7c2f | 3260 | |
d164b209 BB |
3261 | mutex_enter(&zio->io_lock); |
3262 | zio->io_state[ZIO_WAIT_DONE] = 1; | |
3263 | mutex_exit(&zio->io_lock); | |
34dc7c2f | 3264 | |
d164b209 BB |
3265 | for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { |
3266 | zio_link_t *zl = zio->io_walk_link; | |
3267 | pio_next = zio_walk_parents(zio); | |
3268 | zio_remove_child(pio, zio, zl); | |
b128c09f BB |
3269 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); |
3270 | } | |
34dc7c2f | 3271 | |
b128c09f BB |
3272 | if (zio->io_waiter != NULL) { |
3273 | mutex_enter(&zio->io_lock); | |
3274 | zio->io_executor = NULL; | |
3275 | cv_broadcast(&zio->io_cv); | |
3276 | mutex_exit(&zio->io_lock); | |
3277 | } else { | |
3278 | zio_destroy(zio); | |
3279 | } | |
34dc7c2f | 3280 | |
b128c09f | 3281 | return (ZIO_PIPELINE_STOP); |
34dc7c2f BB |
3282 | } |
3283 | ||
3284 | /* | |
b128c09f BB |
3285 | * ========================================================================== |
3286 | * I/O pipeline definition | |
3287 | * ========================================================================== | |
34dc7c2f | 3288 | */ |
428870ff | 3289 | static zio_pipe_stage_t *zio_pipeline[] = { |
b128c09f | 3290 | NULL, |
b128c09f | 3291 | zio_read_bp_init, |
428870ff BB |
3292 | zio_free_bp_init, |
3293 | zio_issue_async, | |
b128c09f BB |
3294 | zio_write_bp_init, |
3295 | zio_checksum_generate, | |
03c6040b | 3296 | zio_nop_write, |
428870ff BB |
3297 | zio_ddt_read_start, |
3298 | zio_ddt_read_done, | |
3299 | zio_ddt_write, | |
3300 | zio_ddt_free, | |
b128c09f BB |
3301 | zio_gang_assemble, |
3302 | zio_gang_issue, | |
3303 | zio_dva_allocate, | |
3304 | zio_dva_free, | |
3305 | zio_dva_claim, | |
3306 | zio_ready, | |
3307 | zio_vdev_io_start, | |
3308 | zio_vdev_io_done, | |
3309 | zio_vdev_io_assess, | |
3310 | zio_checksum_verify, | |
3311 | zio_done | |
3312 | }; | |
c28b2279 | 3313 | |
9ae529ec CS |
3314 | /* dnp is the dnode for zb1->zb_object */ |
3315 | boolean_t | |
5dbd68a3 MA |
3316 | zbookmark_is_before(const dnode_phys_t *dnp, const zbookmark_phys_t *zb1, |
3317 | const zbookmark_phys_t *zb2) | |
9ae529ec CS |
3318 | { |
3319 | uint64_t zb1nextL0, zb2thisobj; | |
3320 | ||
3321 | ASSERT(zb1->zb_objset == zb2->zb_objset); | |
3322 | ASSERT(zb2->zb_level == 0); | |
3323 | ||
9ae529ec CS |
3324 | /* The objset_phys_t isn't before anything. */ |
3325 | if (dnp == NULL) | |
3326 | return (B_FALSE); | |
3327 | ||
3328 | zb1nextL0 = (zb1->zb_blkid + 1) << | |
3329 | ((zb1->zb_level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)); | |
3330 | ||
3331 | zb2thisobj = zb2->zb_object ? zb2->zb_object : | |
3332 | zb2->zb_blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT); | |
3333 | ||
3334 | if (zb1->zb_object == DMU_META_DNODE_OBJECT) { | |
3335 | uint64_t nextobj = zb1nextL0 * | |
3336 | (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT) >> DNODE_SHIFT; | |
3337 | return (nextobj <= zb2thisobj); | |
3338 | } | |
3339 | ||
3340 | if (zb1->zb_object < zb2thisobj) | |
3341 | return (B_TRUE); | |
3342 | if (zb1->zb_object > zb2thisobj) | |
3343 | return (B_FALSE); | |
3344 | if (zb2->zb_object == DMU_META_DNODE_OBJECT) | |
3345 | return (B_FALSE); | |
3346 | return (zb1nextL0 <= zb2->zb_blkid); | |
3347 | } | |
3348 | ||
c28b2279 | 3349 | #if defined(_KERNEL) && defined(HAVE_SPL) |
c28b2279 | 3350 | EXPORT_SYMBOL(zio_type_name); |
81971b13 BB |
3351 | EXPORT_SYMBOL(zio_buf_alloc); |
3352 | EXPORT_SYMBOL(zio_data_buf_alloc); | |
3353 | EXPORT_SYMBOL(zio_buf_free); | |
3354 | EXPORT_SYMBOL(zio_data_buf_free); | |
c28b2279 | 3355 | |
a69052be | 3356 | module_param(zio_delay_max, int, 0644); |
c409e464 BB |
3357 | MODULE_PARM_DESC(zio_delay_max, "Max zio millisec delay before posting event"); |
3358 | ||
3359 | module_param(zio_requeue_io_start_cut_in_line, int, 0644); | |
3360 | MODULE_PARM_DESC(zio_requeue_io_start_cut_in_line, "Prioritize requeued I/O"); | |
29dee3ee CP |
3361 | |
3362 | module_param(zfs_sync_pass_deferred_free, int, 0644); | |
3363 | MODULE_PARM_DESC(zfs_sync_pass_deferred_free, | |
d1d7e268 | 3364 | "Defer frees starting in this pass"); |
29dee3ee CP |
3365 | |
3366 | module_param(zfs_sync_pass_dont_compress, int, 0644); | |
3367 | MODULE_PARM_DESC(zfs_sync_pass_dont_compress, | |
d1d7e268 | 3368 | "Don't compress starting in this pass"); |
29dee3ee CP |
3369 | |
3370 | module_param(zfs_sync_pass_rewrite, int, 0644); | |
3371 | MODULE_PARM_DESC(zfs_sync_pass_rewrite, | |
d1d7e268 | 3372 | "Rewrite new bps starting in this pass"); |
c28b2279 | 3373 | #endif |