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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 | /* | |
22 | * Copyright 2008 Sun Microsystems, Inc. All rights reserved. | |
23 | * Use is subject to license terms. | |
24 | */ | |
25 | ||
34dc7c2f BB |
26 | #include <sys/zfs_context.h> |
27 | #include <sys/fm/fs/zfs.h> | |
28 | #include <sys/spa.h> | |
29 | #include <sys/txg.h> | |
30 | #include <sys/spa_impl.h> | |
31 | #include <sys/vdev_impl.h> | |
32 | #include <sys/zio_impl.h> | |
33 | #include <sys/zio_compress.h> | |
34 | #include <sys/zio_checksum.h> | |
35 | ||
36 | /* | |
37 | * ========================================================================== | |
38 | * I/O priority table | |
39 | * ========================================================================== | |
40 | */ | |
41 | uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE] = { | |
42 | 0, /* ZIO_PRIORITY_NOW */ | |
43 | 0, /* ZIO_PRIORITY_SYNC_READ */ | |
44 | 0, /* ZIO_PRIORITY_SYNC_WRITE */ | |
45 | 6, /* ZIO_PRIORITY_ASYNC_READ */ | |
46 | 4, /* ZIO_PRIORITY_ASYNC_WRITE */ | |
47 | 4, /* ZIO_PRIORITY_FREE */ | |
48 | 0, /* ZIO_PRIORITY_CACHE_FILL */ | |
49 | 0, /* ZIO_PRIORITY_LOG_WRITE */ | |
50 | 10, /* ZIO_PRIORITY_RESILVER */ | |
51 | 20, /* ZIO_PRIORITY_SCRUB */ | |
52 | }; | |
53 | ||
54 | /* | |
55 | * ========================================================================== | |
56 | * I/O type descriptions | |
57 | * ========================================================================== | |
58 | */ | |
59 | char *zio_type_name[ZIO_TYPES] = { | |
60 | "null", "read", "write", "free", "claim", "ioctl" }; | |
61 | ||
b128c09f BB |
62 | #define SYNC_PASS_DEFERRED_FREE 1 /* defer frees after this pass */ |
63 | #define SYNC_PASS_DONT_COMPRESS 4 /* don't compress after this pass */ | |
64 | #define SYNC_PASS_REWRITE 1 /* rewrite new bps after this pass */ | |
34dc7c2f BB |
65 | |
66 | /* | |
67 | * ========================================================================== | |
68 | * I/O kmem caches | |
69 | * ========================================================================== | |
70 | */ | |
71 | kmem_cache_t *zio_cache; | |
72 | kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; | |
73 | kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; | |
74 | ||
75 | #ifdef _KERNEL | |
76 | extern vmem_t *zio_alloc_arena; | |
77 | #endif | |
78 | ||
79 | /* | |
b128c09f BB |
80 | * An allocating zio is one that either currently has the DVA allocate |
81 | * stage set or will have it later in its lifetime. | |
34dc7c2f BB |
82 | */ |
83 | #define IO_IS_ALLOCATING(zio) \ | |
84 | ((zio)->io_orig_pipeline & (1U << ZIO_STAGE_DVA_ALLOCATE)) | |
85 | ||
86 | void | |
87 | zio_init(void) | |
88 | { | |
89 | size_t c; | |
90 | vmem_t *data_alloc_arena = NULL; | |
91 | ||
92 | #ifdef _KERNEL | |
93 | data_alloc_arena = zio_alloc_arena; | |
94 | #endif | |
34dc7c2f BB |
95 | zio_cache = kmem_cache_create("zio_cache", sizeof (zio_t), 0, |
96 | NULL, NULL, NULL, NULL, NULL, 0); | |
97 | ||
98 | /* | |
99 | * For small buffers, we want a cache for each multiple of | |
100 | * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache | |
101 | * for each quarter-power of 2. For large buffers, we want | |
102 | * a cache for each multiple of PAGESIZE. | |
103 | */ | |
104 | for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { | |
105 | size_t size = (c + 1) << SPA_MINBLOCKSHIFT; | |
106 | size_t p2 = size; | |
107 | size_t align = 0; | |
108 | ||
109 | while (p2 & (p2 - 1)) | |
110 | p2 &= p2 - 1; | |
111 | ||
112 | if (size <= 4 * SPA_MINBLOCKSIZE) { | |
113 | align = SPA_MINBLOCKSIZE; | |
114 | } else if (P2PHASE(size, PAGESIZE) == 0) { | |
115 | align = PAGESIZE; | |
116 | } else if (P2PHASE(size, p2 >> 2) == 0) { | |
117 | align = p2 >> 2; | |
118 | } | |
119 | ||
120 | if (align != 0) { | |
121 | char name[36]; | |
122 | (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); | |
123 | zio_buf_cache[c] = kmem_cache_create(name, size, | |
124 | align, NULL, NULL, NULL, NULL, NULL, KMC_NODEBUG); | |
125 | ||
126 | (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); | |
127 | zio_data_buf_cache[c] = kmem_cache_create(name, size, | |
128 | align, NULL, NULL, NULL, NULL, data_alloc_arena, | |
129 | KMC_NODEBUG); | |
34dc7c2f BB |
130 | } |
131 | } | |
132 | ||
133 | while (--c != 0) { | |
134 | ASSERT(zio_buf_cache[c] != NULL); | |
135 | if (zio_buf_cache[c - 1] == NULL) | |
136 | zio_buf_cache[c - 1] = zio_buf_cache[c]; | |
137 | ||
138 | ASSERT(zio_data_buf_cache[c] != NULL); | |
139 | if (zio_data_buf_cache[c - 1] == NULL) | |
140 | zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; | |
141 | } | |
142 | ||
34dc7c2f BB |
143 | zio_inject_init(); |
144 | } | |
145 | ||
146 | void | |
147 | zio_fini(void) | |
148 | { | |
149 | size_t c; | |
150 | kmem_cache_t *last_cache = NULL; | |
151 | kmem_cache_t *last_data_cache = NULL; | |
152 | ||
153 | for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { | |
154 | if (zio_buf_cache[c] != last_cache) { | |
155 | last_cache = zio_buf_cache[c]; | |
156 | kmem_cache_destroy(zio_buf_cache[c]); | |
157 | } | |
158 | zio_buf_cache[c] = NULL; | |
159 | ||
160 | if (zio_data_buf_cache[c] != last_data_cache) { | |
161 | last_data_cache = zio_data_buf_cache[c]; | |
162 | kmem_cache_destroy(zio_data_buf_cache[c]); | |
163 | } | |
164 | zio_data_buf_cache[c] = NULL; | |
165 | } | |
166 | ||
34dc7c2f BB |
167 | kmem_cache_destroy(zio_cache); |
168 | ||
169 | zio_inject_fini(); | |
170 | } | |
171 | ||
172 | /* | |
173 | * ========================================================================== | |
174 | * Allocate and free I/O buffers | |
175 | * ========================================================================== | |
176 | */ | |
177 | ||
178 | /* | |
179 | * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a | |
180 | * crashdump if the kernel panics, so use it judiciously. Obviously, it's | |
181 | * useful to inspect ZFS metadata, but if possible, we should avoid keeping | |
182 | * excess / transient data in-core during a crashdump. | |
183 | */ | |
184 | void * | |
185 | zio_buf_alloc(size_t size) | |
186 | { | |
187 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
188 | ||
189 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
190 | ||
191 | return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); | |
192 | } | |
193 | ||
194 | /* | |
195 | * Use zio_data_buf_alloc to allocate data. The data will not appear in a | |
196 | * crashdump if the kernel panics. This exists so that we will limit the amount | |
197 | * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount | |
198 | * of kernel heap dumped to disk when the kernel panics) | |
199 | */ | |
200 | void * | |
201 | zio_data_buf_alloc(size_t size) | |
202 | { | |
203 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
204 | ||
205 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
206 | ||
207 | return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); | |
208 | } | |
209 | ||
210 | void | |
211 | zio_buf_free(void *buf, size_t size) | |
212 | { | |
213 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
214 | ||
215 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
216 | ||
217 | kmem_cache_free(zio_buf_cache[c], buf); | |
218 | } | |
219 | ||
220 | void | |
221 | zio_data_buf_free(void *buf, size_t size) | |
222 | { | |
223 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
224 | ||
225 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
226 | ||
227 | kmem_cache_free(zio_data_buf_cache[c], buf); | |
228 | } | |
229 | ||
230 | /* | |
231 | * ========================================================================== | |
232 | * Push and pop I/O transform buffers | |
233 | * ========================================================================== | |
234 | */ | |
235 | static void | |
b128c09f BB |
236 | zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, |
237 | zio_transform_func_t *transform) | |
34dc7c2f BB |
238 | { |
239 | zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); | |
240 | ||
b128c09f BB |
241 | zt->zt_orig_data = zio->io_data; |
242 | zt->zt_orig_size = zio->io_size; | |
34dc7c2f | 243 | zt->zt_bufsize = bufsize; |
b128c09f | 244 | zt->zt_transform = transform; |
34dc7c2f BB |
245 | |
246 | zt->zt_next = zio->io_transform_stack; | |
247 | zio->io_transform_stack = zt; | |
248 | ||
249 | zio->io_data = data; | |
250 | zio->io_size = size; | |
251 | } | |
252 | ||
253 | static void | |
b128c09f | 254 | zio_pop_transforms(zio_t *zio) |
34dc7c2f | 255 | { |
b128c09f BB |
256 | zio_transform_t *zt; |
257 | ||
258 | while ((zt = zio->io_transform_stack) != NULL) { | |
259 | if (zt->zt_transform != NULL) | |
260 | zt->zt_transform(zio, | |
261 | zt->zt_orig_data, zt->zt_orig_size); | |
34dc7c2f | 262 | |
b128c09f | 263 | zio_buf_free(zio->io_data, zt->zt_bufsize); |
34dc7c2f | 264 | |
b128c09f BB |
265 | zio->io_data = zt->zt_orig_data; |
266 | zio->io_size = zt->zt_orig_size; | |
267 | zio->io_transform_stack = zt->zt_next; | |
34dc7c2f | 268 | |
b128c09f | 269 | kmem_free(zt, sizeof (zio_transform_t)); |
34dc7c2f BB |
270 | } |
271 | } | |
272 | ||
b128c09f BB |
273 | /* |
274 | * ========================================================================== | |
275 | * I/O transform callbacks for subblocks and decompression | |
276 | * ========================================================================== | |
277 | */ | |
278 | static void | |
279 | zio_subblock(zio_t *zio, void *data, uint64_t size) | |
280 | { | |
281 | ASSERT(zio->io_size > size); | |
282 | ||
283 | if (zio->io_type == ZIO_TYPE_READ) | |
284 | bcopy(zio->io_data, data, size); | |
285 | } | |
286 | ||
287 | static void | |
288 | zio_decompress(zio_t *zio, void *data, uint64_t size) | |
289 | { | |
290 | if (zio->io_error == 0 && | |
291 | zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), | |
292 | zio->io_data, zio->io_size, data, size) != 0) | |
293 | zio->io_error = EIO; | |
294 | } | |
295 | ||
296 | /* | |
297 | * ========================================================================== | |
298 | * I/O parent/child relationships and pipeline interlocks | |
299 | * ========================================================================== | |
300 | */ | |
301 | ||
302 | static void | |
303 | zio_add_child(zio_t *pio, zio_t *zio) | |
304 | { | |
305 | mutex_enter(&pio->io_lock); | |
306 | if (zio->io_stage < ZIO_STAGE_READY) | |
307 | pio->io_children[zio->io_child_type][ZIO_WAIT_READY]++; | |
308 | if (zio->io_stage < ZIO_STAGE_DONE) | |
309 | pio->io_children[zio->io_child_type][ZIO_WAIT_DONE]++; | |
310 | zio->io_sibling_prev = NULL; | |
311 | zio->io_sibling_next = pio->io_child; | |
312 | if (pio->io_child != NULL) | |
313 | pio->io_child->io_sibling_prev = zio; | |
314 | pio->io_child = zio; | |
315 | zio->io_parent = pio; | |
316 | mutex_exit(&pio->io_lock); | |
317 | } | |
318 | ||
34dc7c2f | 319 | static void |
b128c09f BB |
320 | zio_remove_child(zio_t *pio, zio_t *zio) |
321 | { | |
322 | zio_t *next, *prev; | |
323 | ||
324 | ASSERT(zio->io_parent == pio); | |
325 | ||
326 | mutex_enter(&pio->io_lock); | |
327 | next = zio->io_sibling_next; | |
328 | prev = zio->io_sibling_prev; | |
329 | if (next != NULL) | |
330 | next->io_sibling_prev = prev; | |
331 | if (prev != NULL) | |
332 | prev->io_sibling_next = next; | |
333 | if (pio->io_child == zio) | |
334 | pio->io_child = next; | |
335 | mutex_exit(&pio->io_lock); | |
336 | } | |
337 | ||
338 | static boolean_t | |
339 | zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) | |
34dc7c2f | 340 | { |
b128c09f BB |
341 | uint64_t *countp = &zio->io_children[child][wait]; |
342 | boolean_t waiting = B_FALSE; | |
343 | ||
344 | mutex_enter(&zio->io_lock); | |
345 | ASSERT(zio->io_stall == NULL); | |
346 | if (*countp != 0) { | |
347 | zio->io_stage--; | |
348 | zio->io_stall = countp; | |
349 | waiting = B_TRUE; | |
350 | } | |
351 | mutex_exit(&zio->io_lock); | |
352 | ||
353 | return (waiting); | |
354 | } | |
34dc7c2f | 355 | |
b128c09f BB |
356 | static void |
357 | zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) | |
358 | { | |
359 | uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; | |
360 | int *errorp = &pio->io_child_error[zio->io_child_type]; | |
34dc7c2f | 361 | |
b128c09f BB |
362 | mutex_enter(&pio->io_lock); |
363 | if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) | |
364 | *errorp = zio_worst_error(*errorp, zio->io_error); | |
365 | pio->io_reexecute |= zio->io_reexecute; | |
366 | ASSERT3U(*countp, >, 0); | |
367 | if (--*countp == 0 && pio->io_stall == countp) { | |
368 | pio->io_stall = NULL; | |
369 | mutex_exit(&pio->io_lock); | |
370 | zio_execute(pio); | |
371 | } else { | |
372 | mutex_exit(&pio->io_lock); | |
34dc7c2f BB |
373 | } |
374 | } | |
375 | ||
b128c09f BB |
376 | static void |
377 | zio_inherit_child_errors(zio_t *zio, enum zio_child c) | |
378 | { | |
379 | if (zio->io_child_error[c] != 0 && zio->io_error == 0) | |
380 | zio->io_error = zio->io_child_error[c]; | |
381 | } | |
382 | ||
34dc7c2f BB |
383 | /* |
384 | * ========================================================================== | |
b128c09f | 385 | * Create the various types of I/O (read, write, free, etc) |
34dc7c2f BB |
386 | * ========================================================================== |
387 | */ | |
388 | static zio_t * | |
389 | zio_create(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, | |
390 | void *data, uint64_t size, zio_done_func_t *done, void *private, | |
b128c09f BB |
391 | zio_type_t type, int priority, int flags, vdev_t *vd, uint64_t offset, |
392 | const zbookmark_t *zb, uint8_t stage, uint32_t pipeline) | |
34dc7c2f BB |
393 | { |
394 | zio_t *zio; | |
395 | ||
396 | ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); | |
397 | ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); | |
b128c09f BB |
398 | ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); |
399 | ||
400 | ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); | |
401 | ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); | |
402 | ASSERT(vd || stage == ZIO_STAGE_OPEN); | |
34dc7c2f BB |
403 | |
404 | zio = kmem_cache_alloc(zio_cache, KM_SLEEP); | |
405 | bzero(zio, sizeof (zio_t)); | |
b128c09f BB |
406 | |
407 | mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); | |
408 | cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); | |
409 | ||
410 | if (vd != NULL) | |
411 | zio->io_child_type = ZIO_CHILD_VDEV; | |
412 | else if (flags & ZIO_FLAG_GANG_CHILD) | |
413 | zio->io_child_type = ZIO_CHILD_GANG; | |
414 | else | |
415 | zio->io_child_type = ZIO_CHILD_LOGICAL; | |
416 | ||
34dc7c2f BB |
417 | if (bp != NULL) { |
418 | zio->io_bp = bp; | |
419 | zio->io_bp_copy = *bp; | |
420 | zio->io_bp_orig = *bp; | |
b128c09f BB |
421 | if (type != ZIO_TYPE_WRITE) |
422 | zio->io_bp = &zio->io_bp_copy; /* so caller can free */ | |
423 | if (zio->io_child_type == ZIO_CHILD_LOGICAL) { | |
424 | if (BP_IS_GANG(bp)) | |
425 | pipeline |= ZIO_GANG_STAGES; | |
426 | zio->io_logical = zio; | |
427 | } | |
34dc7c2f | 428 | } |
b128c09f BB |
429 | |
430 | zio->io_spa = spa; | |
431 | zio->io_txg = txg; | |
432 | zio->io_data = data; | |
433 | zio->io_size = size; | |
34dc7c2f BB |
434 | zio->io_done = done; |
435 | zio->io_private = private; | |
436 | zio->io_type = type; | |
437 | zio->io_priority = priority; | |
b128c09f BB |
438 | zio->io_vd = vd; |
439 | zio->io_offset = offset; | |
440 | zio->io_orig_flags = zio->io_flags = flags; | |
441 | zio->io_orig_stage = zio->io_stage = stage; | |
442 | zio->io_orig_pipeline = zio->io_pipeline = pipeline; | |
34dc7c2f | 443 | |
b128c09f BB |
444 | if (zb != NULL) |
445 | zio->io_bookmark = *zb; | |
446 | ||
447 | if (pio != NULL) { | |
448 | /* | |
449 | * Logical I/Os can have logical, gang, or vdev children. | |
450 | * Gang I/Os can have gang or vdev children. | |
451 | * Vdev I/Os can only have vdev children. | |
452 | * The following ASSERT captures all of these constraints. | |
453 | */ | |
454 | ASSERT(zio->io_child_type <= pio->io_child_type); | |
455 | if (zio->io_logical == NULL) | |
34dc7c2f | 456 | zio->io_logical = pio->io_logical; |
b128c09f | 457 | zio_add_child(pio, zio); |
34dc7c2f BB |
458 | } |
459 | ||
34dc7c2f BB |
460 | return (zio); |
461 | } | |
462 | ||
463 | static void | |
b128c09f | 464 | zio_destroy(zio_t *zio) |
34dc7c2f | 465 | { |
b128c09f BB |
466 | spa_t *spa = zio->io_spa; |
467 | uint8_t async_root = zio->io_async_root; | |
468 | ||
469 | mutex_destroy(&zio->io_lock); | |
470 | cv_destroy(&zio->io_cv); | |
471 | kmem_cache_free(zio_cache, zio); | |
34dc7c2f | 472 | |
b128c09f BB |
473 | if (async_root) { |
474 | mutex_enter(&spa->spa_async_root_lock); | |
475 | if (--spa->spa_async_root_count == 0) | |
476 | cv_broadcast(&spa->spa_async_root_cv); | |
477 | mutex_exit(&spa->spa_async_root_lock); | |
478 | } | |
34dc7c2f BB |
479 | } |
480 | ||
481 | zio_t * | |
482 | zio_null(zio_t *pio, spa_t *spa, zio_done_func_t *done, void *private, | |
483 | int flags) | |
484 | { | |
485 | zio_t *zio; | |
486 | ||
487 | zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, | |
b128c09f BB |
488 | ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, NULL, 0, NULL, |
489 | ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); | |
34dc7c2f BB |
490 | |
491 | return (zio); | |
492 | } | |
493 | ||
494 | zio_t * | |
495 | zio_root(spa_t *spa, zio_done_func_t *done, void *private, int flags) | |
496 | { | |
497 | return (zio_null(NULL, spa, done, private, flags)); | |
498 | } | |
499 | ||
500 | zio_t * | |
b128c09f BB |
501 | zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, |
502 | void *data, uint64_t size, zio_done_func_t *done, void *private, | |
503 | int priority, int flags, const zbookmark_t *zb) | |
34dc7c2f BB |
504 | { |
505 | zio_t *zio; | |
506 | ||
b128c09f BB |
507 | zio = zio_create(pio, spa, bp->blk_birth, (blkptr_t *)bp, |
508 | data, size, done, private, | |
509 | ZIO_TYPE_READ, priority, flags, NULL, 0, zb, | |
34dc7c2f | 510 | ZIO_STAGE_OPEN, ZIO_READ_PIPELINE); |
34dc7c2f | 511 | |
b128c09f BB |
512 | return (zio); |
513 | } | |
34dc7c2f | 514 | |
b128c09f BB |
515 | void |
516 | zio_skip_write(zio_t *zio) | |
517 | { | |
518 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); | |
519 | ASSERT(zio->io_stage == ZIO_STAGE_READY); | |
520 | ASSERT(!BP_IS_GANG(zio->io_bp)); | |
34dc7c2f | 521 | |
b128c09f | 522 | zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; |
34dc7c2f BB |
523 | } |
524 | ||
525 | zio_t * | |
b128c09f BB |
526 | zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, |
527 | void *data, uint64_t size, zio_prop_t *zp, | |
528 | zio_done_func_t *ready, zio_done_func_t *done, void *private, | |
529 | int priority, int flags, const zbookmark_t *zb) | |
34dc7c2f BB |
530 | { |
531 | zio_t *zio; | |
532 | ||
b128c09f BB |
533 | ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && |
534 | zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && | |
535 | zp->zp_compress >= ZIO_COMPRESS_OFF && | |
536 | zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && | |
537 | zp->zp_type < DMU_OT_NUMTYPES && | |
538 | zp->zp_level < 32 && | |
539 | zp->zp_ndvas > 0 && | |
540 | zp->zp_ndvas <= spa_max_replication(spa)); | |
541 | ASSERT(ready != NULL); | |
34dc7c2f BB |
542 | |
543 | zio = zio_create(pio, spa, txg, bp, data, size, done, private, | |
b128c09f | 544 | ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, |
34dc7c2f BB |
545 | ZIO_STAGE_OPEN, ZIO_WRITE_PIPELINE); |
546 | ||
547 | zio->io_ready = ready; | |
b128c09f | 548 | zio->io_prop = *zp; |
34dc7c2f BB |
549 | |
550 | return (zio); | |
551 | } | |
552 | ||
553 | zio_t * | |
b128c09f BB |
554 | zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, |
555 | uint64_t size, zio_done_func_t *done, void *private, int priority, | |
556 | int flags, zbookmark_t *zb) | |
34dc7c2f BB |
557 | { |
558 | zio_t *zio; | |
559 | ||
34dc7c2f | 560 | zio = zio_create(pio, spa, txg, bp, data, size, done, private, |
b128c09f BB |
561 | ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, |
562 | ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); | |
34dc7c2f BB |
563 | |
564 | return (zio); | |
565 | } | |
566 | ||
567 | zio_t * | |
568 | zio_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, | |
b128c09f | 569 | zio_done_func_t *done, void *private, int flags) |
34dc7c2f BB |
570 | { |
571 | zio_t *zio; | |
572 | ||
573 | ASSERT(!BP_IS_HOLE(bp)); | |
574 | ||
b128c09f BB |
575 | if (bp->blk_fill == BLK_FILL_ALREADY_FREED) |
576 | return (zio_null(pio, spa, NULL, NULL, flags)); | |
577 | ||
34dc7c2f | 578 | if (txg == spa->spa_syncing_txg && |
b128c09f | 579 | spa_sync_pass(spa) > SYNC_PASS_DEFERRED_FREE) { |
34dc7c2f | 580 | bplist_enqueue_deferred(&spa->spa_sync_bplist, bp); |
b128c09f | 581 | return (zio_null(pio, spa, NULL, NULL, flags)); |
34dc7c2f BB |
582 | } |
583 | ||
b128c09f BB |
584 | zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), |
585 | done, private, ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, flags, | |
586 | NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_FREE_PIPELINE); | |
34dc7c2f BB |
587 | |
588 | return (zio); | |
589 | } | |
590 | ||
591 | zio_t * | |
592 | zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, | |
b128c09f | 593 | zio_done_func_t *done, void *private, int flags) |
34dc7c2f BB |
594 | { |
595 | zio_t *zio; | |
596 | ||
597 | /* | |
598 | * A claim is an allocation of a specific block. Claims are needed | |
599 | * to support immediate writes in the intent log. The issue is that | |
600 | * immediate writes contain committed data, but in a txg that was | |
601 | * *not* committed. Upon opening the pool after an unclean shutdown, | |
602 | * the intent log claims all blocks that contain immediate write data | |
603 | * so that the SPA knows they're in use. | |
604 | * | |
605 | * All claims *must* be resolved in the first txg -- before the SPA | |
606 | * starts allocating blocks -- so that nothing is allocated twice. | |
607 | */ | |
608 | ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); | |
609 | ASSERT3U(spa_first_txg(spa), <=, txg); | |
610 | ||
b128c09f BB |
611 | zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), |
612 | done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, | |
613 | NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); | |
34dc7c2f BB |
614 | |
615 | return (zio); | |
616 | } | |
617 | ||
618 | zio_t * | |
619 | zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, | |
620 | zio_done_func_t *done, void *private, int priority, int flags) | |
621 | { | |
622 | zio_t *zio; | |
623 | int c; | |
624 | ||
625 | if (vd->vdev_children == 0) { | |
626 | zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, | |
b128c09f | 627 | ZIO_TYPE_IOCTL, priority, flags, vd, 0, NULL, |
34dc7c2f BB |
628 | ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); |
629 | ||
34dc7c2f BB |
630 | zio->io_cmd = cmd; |
631 | } else { | |
632 | zio = zio_null(pio, spa, NULL, NULL, flags); | |
633 | ||
634 | for (c = 0; c < vd->vdev_children; c++) | |
635 | zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, | |
636 | done, private, priority, flags)); | |
637 | } | |
638 | ||
639 | return (zio); | |
640 | } | |
641 | ||
34dc7c2f BB |
642 | zio_t * |
643 | zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, | |
644 | void *data, int checksum, zio_done_func_t *done, void *private, | |
645 | int priority, int flags, boolean_t labels) | |
646 | { | |
647 | zio_t *zio; | |
34dc7c2f | 648 | |
b128c09f BB |
649 | ASSERT(vd->vdev_children == 0); |
650 | ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || | |
651 | offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); | |
652 | ASSERT3U(offset + size, <=, vd->vdev_psize); | |
34dc7c2f | 653 | |
b128c09f BB |
654 | zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, |
655 | ZIO_TYPE_READ, priority, flags, vd, offset, NULL, | |
34dc7c2f BB |
656 | ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); |
657 | ||
b128c09f | 658 | zio->io_prop.zp_checksum = checksum; |
34dc7c2f BB |
659 | |
660 | return (zio); | |
661 | } | |
662 | ||
663 | zio_t * | |
664 | zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, | |
665 | void *data, int checksum, zio_done_func_t *done, void *private, | |
666 | int priority, int flags, boolean_t labels) | |
667 | { | |
34dc7c2f | 668 | zio_t *zio; |
34dc7c2f | 669 | |
b128c09f BB |
670 | ASSERT(vd->vdev_children == 0); |
671 | ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || | |
672 | offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); | |
673 | ASSERT3U(offset + size, <=, vd->vdev_psize); | |
34dc7c2f | 674 | |
b128c09f BB |
675 | zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, |
676 | ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL, | |
34dc7c2f BB |
677 | ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); |
678 | ||
b128c09f | 679 | zio->io_prop.zp_checksum = checksum; |
34dc7c2f BB |
680 | |
681 | if (zio_checksum_table[checksum].ci_zbt) { | |
682 | /* | |
683 | * zbt checksums are necessarily destructive -- they modify | |
b128c09f | 684 | * the end of the write buffer to hold the verifier/checksum. |
34dc7c2f | 685 | * Therefore, we must make a local copy in case the data is |
b128c09f | 686 | * being written to multiple places in parallel. |
34dc7c2f | 687 | */ |
b128c09f | 688 | void *wbuf = zio_buf_alloc(size); |
34dc7c2f | 689 | bcopy(data, wbuf, size); |
b128c09f | 690 | zio_push_transform(zio, wbuf, size, size, NULL); |
34dc7c2f BB |
691 | } |
692 | ||
693 | return (zio); | |
694 | } | |
695 | ||
696 | /* | |
b128c09f | 697 | * Create a child I/O to do some work for us. |
34dc7c2f BB |
698 | */ |
699 | zio_t * | |
b128c09f | 700 | zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, |
34dc7c2f BB |
701 | void *data, uint64_t size, int type, int priority, int flags, |
702 | zio_done_func_t *done, void *private) | |
703 | { | |
704 | uint32_t pipeline = ZIO_VDEV_CHILD_PIPELINE; | |
b128c09f BB |
705 | zio_t *zio; |
706 | ||
707 | ASSERT(vd->vdev_parent == | |
708 | (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); | |
34dc7c2f BB |
709 | |
710 | if (type == ZIO_TYPE_READ && bp != NULL) { | |
711 | /* | |
712 | * If we have the bp, then the child should perform the | |
713 | * checksum and the parent need not. This pushes error | |
714 | * detection as close to the leaves as possible and | |
715 | * eliminates redundant checksums in the interior nodes. | |
716 | */ | |
717 | pipeline |= 1U << ZIO_STAGE_CHECKSUM_VERIFY; | |
b128c09f | 718 | pio->io_pipeline &= ~(1U << ZIO_STAGE_CHECKSUM_VERIFY); |
34dc7c2f BB |
719 | } |
720 | ||
b128c09f BB |
721 | if (vd->vdev_children == 0) |
722 | offset += VDEV_LABEL_START_SIZE; | |
723 | ||
724 | zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, | |
34dc7c2f | 725 | done, private, type, priority, |
b128c09f BB |
726 | (pio->io_flags & ZIO_FLAG_VDEV_INHERIT) | |
727 | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | flags, | |
728 | vd, offset, &pio->io_bookmark, | |
34dc7c2f BB |
729 | ZIO_STAGE_VDEV_IO_START - 1, pipeline); |
730 | ||
b128c09f | 731 | return (zio); |
34dc7c2f BB |
732 | } |
733 | ||
b128c09f BB |
734 | zio_t * |
735 | zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, | |
736 | int type, int priority, int flags, zio_done_func_t *done, void *private) | |
34dc7c2f | 737 | { |
b128c09f | 738 | zio_t *zio; |
34dc7c2f | 739 | |
b128c09f | 740 | ASSERT(vd->vdev_ops->vdev_op_leaf); |
34dc7c2f | 741 | |
b128c09f BB |
742 | zio = zio_create(NULL, vd->vdev_spa, 0, NULL, |
743 | data, size, done, private, type, priority, | |
744 | flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY, | |
745 | vd, offset, NULL, | |
746 | ZIO_STAGE_VDEV_IO_START - 1, ZIO_VDEV_CHILD_PIPELINE); | |
34dc7c2f | 747 | |
b128c09f | 748 | return (zio); |
34dc7c2f BB |
749 | } |
750 | ||
751 | void | |
b128c09f | 752 | zio_flush(zio_t *zio, vdev_t *vd) |
34dc7c2f | 753 | { |
b128c09f BB |
754 | zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, |
755 | NULL, NULL, ZIO_PRIORITY_NOW, | |
756 | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); | |
34dc7c2f BB |
757 | } |
758 | ||
759 | /* | |
760 | * ========================================================================== | |
b128c09f | 761 | * Prepare to read and write logical blocks |
34dc7c2f BB |
762 | * ========================================================================== |
763 | */ | |
b128c09f | 764 | |
34dc7c2f | 765 | static int |
b128c09f | 766 | zio_read_bp_init(zio_t *zio) |
34dc7c2f | 767 | { |
b128c09f | 768 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 769 | |
b128c09f BB |
770 | if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && zio->io_logical == zio) { |
771 | uint64_t csize = BP_GET_PSIZE(bp); | |
772 | void *cbuf = zio_buf_alloc(csize); | |
773 | ||
774 | zio_push_transform(zio, cbuf, csize, csize, zio_decompress); | |
34dc7c2f | 775 | } |
34dc7c2f | 776 | |
b128c09f BB |
777 | if (!dmu_ot[BP_GET_TYPE(bp)].ot_metadata && BP_GET_LEVEL(bp) == 0) |
778 | zio->io_flags |= ZIO_FLAG_DONT_CACHE; | |
779 | ||
780 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f BB |
781 | } |
782 | ||
b128c09f BB |
783 | static int |
784 | zio_write_bp_init(zio_t *zio) | |
34dc7c2f | 785 | { |
b128c09f BB |
786 | zio_prop_t *zp = &zio->io_prop; |
787 | int compress = zp->zp_compress; | |
34dc7c2f | 788 | blkptr_t *bp = zio->io_bp; |
b128c09f BB |
789 | void *cbuf; |
790 | uint64_t lsize = zio->io_size; | |
791 | uint64_t csize = lsize; | |
792 | uint64_t cbufsize = 0; | |
793 | int pass = 1; | |
34dc7c2f | 794 | |
b128c09f BB |
795 | /* |
796 | * If our children haven't all reached the ready stage, | |
797 | * wait for them and then repeat this pipeline stage. | |
798 | */ | |
799 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || | |
800 | zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) | |
801 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 802 | |
b128c09f BB |
803 | if (!IO_IS_ALLOCATING(zio)) |
804 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f | 805 | |
b128c09f | 806 | ASSERT(compress != ZIO_COMPRESS_INHERIT); |
34dc7c2f | 807 | |
b128c09f BB |
808 | if (bp->blk_birth == zio->io_txg) { |
809 | /* | |
810 | * We're rewriting an existing block, which means we're | |
811 | * working on behalf of spa_sync(). For spa_sync() to | |
812 | * converge, it must eventually be the case that we don't | |
813 | * have to allocate new blocks. But compression changes | |
814 | * the blocksize, which forces a reallocate, and makes | |
815 | * convergence take longer. Therefore, after the first | |
816 | * few passes, stop compressing to ensure convergence. | |
817 | */ | |
818 | pass = spa_sync_pass(zio->io_spa); | |
819 | ASSERT(pass > 1); | |
34dc7c2f | 820 | |
b128c09f BB |
821 | if (pass > SYNC_PASS_DONT_COMPRESS) |
822 | compress = ZIO_COMPRESS_OFF; | |
34dc7c2f | 823 | |
b128c09f BB |
824 | /* |
825 | * Only MOS (objset 0) data should need to be rewritten. | |
826 | */ | |
827 | ASSERT(zio->io_logical->io_bookmark.zb_objset == 0); | |
34dc7c2f | 828 | |
b128c09f BB |
829 | /* Make sure someone doesn't change their mind on overwrites */ |
830 | ASSERT(MIN(zp->zp_ndvas + BP_IS_GANG(bp), | |
831 | spa_max_replication(zio->io_spa)) == BP_GET_NDVAS(bp)); | |
832 | } | |
34dc7c2f | 833 | |
b128c09f BB |
834 | if (compress != ZIO_COMPRESS_OFF) { |
835 | if (!zio_compress_data(compress, zio->io_data, zio->io_size, | |
836 | &cbuf, &csize, &cbufsize)) { | |
837 | compress = ZIO_COMPRESS_OFF; | |
838 | } else if (csize != 0) { | |
839 | zio_push_transform(zio, cbuf, csize, cbufsize, NULL); | |
840 | } | |
841 | } | |
34dc7c2f | 842 | |
b128c09f BB |
843 | /* |
844 | * The final pass of spa_sync() must be all rewrites, but the first | |
845 | * few passes offer a trade-off: allocating blocks defers convergence, | |
846 | * but newly allocated blocks are sequential, so they can be written | |
847 | * to disk faster. Therefore, we allow the first few passes of | |
848 | * spa_sync() to allocate new blocks, but force rewrites after that. | |
849 | * There should only be a handful of blocks after pass 1 in any case. | |
850 | */ | |
851 | if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == csize && | |
852 | pass > SYNC_PASS_REWRITE) { | |
853 | ASSERT(csize != 0); | |
854 | uint32_t gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; | |
855 | zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; | |
856 | zio->io_flags |= ZIO_FLAG_IO_REWRITE; | |
857 | } else { | |
858 | BP_ZERO(bp); | |
859 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
860 | } | |
34dc7c2f | 861 | |
b128c09f BB |
862 | if (csize == 0) { |
863 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
864 | } else { | |
865 | ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); | |
866 | BP_SET_LSIZE(bp, lsize); | |
867 | BP_SET_PSIZE(bp, csize); | |
868 | BP_SET_COMPRESS(bp, compress); | |
869 | BP_SET_CHECKSUM(bp, zp->zp_checksum); | |
870 | BP_SET_TYPE(bp, zp->zp_type); | |
871 | BP_SET_LEVEL(bp, zp->zp_level); | |
872 | BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); | |
873 | } | |
34dc7c2f BB |
874 | |
875 | return (ZIO_PIPELINE_CONTINUE); | |
876 | } | |
877 | ||
b128c09f BB |
878 | /* |
879 | * ========================================================================== | |
880 | * Execute the I/O pipeline | |
881 | * ========================================================================== | |
882 | */ | |
883 | ||
884 | static void | |
885 | zio_taskq_dispatch(zio_t *zio, enum zio_taskq_type q) | |
34dc7c2f | 886 | { |
b128c09f | 887 | zio_type_t t = zio->io_type; |
34dc7c2f BB |
888 | |
889 | /* | |
b128c09f BB |
890 | * If we're a config writer, the normal issue and interrupt threads |
891 | * may all be blocked waiting for the config lock. In this case, | |
892 | * select the otherwise-unused taskq for ZIO_TYPE_NULL. | |
34dc7c2f | 893 | */ |
b128c09f BB |
894 | if (zio->io_flags & ZIO_FLAG_CONFIG_WRITER) |
895 | t = ZIO_TYPE_NULL; | |
34dc7c2f BB |
896 | |
897 | /* | |
b128c09f | 898 | * A similar issue exists for the L2ARC write thread until L2ARC 2.0. |
34dc7c2f | 899 | */ |
b128c09f BB |
900 | if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) |
901 | t = ZIO_TYPE_NULL; | |
34dc7c2f | 902 | |
b128c09f BB |
903 | (void) taskq_dispatch(zio->io_spa->spa_zio_taskq[t][q], |
904 | (task_func_t *)zio_execute, zio, TQ_SLEEP); | |
905 | } | |
34dc7c2f | 906 | |
b128c09f BB |
907 | static boolean_t |
908 | zio_taskq_member(zio_t *zio, enum zio_taskq_type q) | |
909 | { | |
910 | kthread_t *executor = zio->io_executor; | |
911 | spa_t *spa = zio->io_spa; | |
34dc7c2f | 912 | |
b128c09f BB |
913 | for (zio_type_t t = 0; t < ZIO_TYPES; t++) |
914 | if (taskq_member(spa->spa_zio_taskq[t][q], executor)) | |
915 | return (B_TRUE); | |
34dc7c2f | 916 | |
b128c09f BB |
917 | return (B_FALSE); |
918 | } | |
34dc7c2f | 919 | |
b128c09f BB |
920 | static int |
921 | zio_issue_async(zio_t *zio) | |
922 | { | |
923 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); | |
924 | ||
925 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
926 | } |
927 | ||
b128c09f BB |
928 | void |
929 | zio_interrupt(zio_t *zio) | |
34dc7c2f | 930 | { |
b128c09f BB |
931 | zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT); |
932 | } | |
34dc7c2f | 933 | |
b128c09f BB |
934 | /* |
935 | * Execute the I/O pipeline until one of the following occurs: | |
936 | * (1) the I/O completes; (2) the pipeline stalls waiting for | |
937 | * dependent child I/Os; (3) the I/O issues, so we're waiting | |
938 | * for an I/O completion interrupt; (4) the I/O is delegated by | |
939 | * vdev-level caching or aggregation; (5) the I/O is deferred | |
940 | * due to vdev-level queueing; (6) the I/O is handed off to | |
941 | * another thread. In all cases, the pipeline stops whenever | |
942 | * there's no CPU work; it never burns a thread in cv_wait(). | |
943 | * | |
944 | * There's no locking on io_stage because there's no legitimate way | |
945 | * for multiple threads to be attempting to process the same I/O. | |
946 | */ | |
947 | static zio_pipe_stage_t *zio_pipeline[ZIO_STAGES]; | |
34dc7c2f | 948 | |
b128c09f BB |
949 | void |
950 | zio_execute(zio_t *zio) | |
951 | { | |
952 | zio->io_executor = curthread; | |
34dc7c2f | 953 | |
b128c09f BB |
954 | while (zio->io_stage < ZIO_STAGE_DONE) { |
955 | uint32_t pipeline = zio->io_pipeline; | |
956 | zio_stage_t stage = zio->io_stage; | |
957 | int rv; | |
34dc7c2f | 958 | |
b128c09f | 959 | ASSERT(!MUTEX_HELD(&zio->io_lock)); |
34dc7c2f | 960 | |
b128c09f BB |
961 | while (((1U << ++stage) & pipeline) == 0) |
962 | continue; | |
963 | ||
964 | ASSERT(stage <= ZIO_STAGE_DONE); | |
965 | ASSERT(zio->io_stall == NULL); | |
34dc7c2f BB |
966 | |
967 | /* | |
b128c09f BB |
968 | * If we are in interrupt context and this pipeline stage |
969 | * will grab a config lock that is held across I/O, | |
970 | * issue async to avoid deadlock. | |
34dc7c2f | 971 | */ |
b128c09f BB |
972 | if (((1U << stage) & ZIO_CONFIG_LOCK_BLOCKING_STAGES) && |
973 | zio->io_vd == NULL && | |
974 | zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { | |
975 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); | |
976 | return; | |
34dc7c2f BB |
977 | } |
978 | ||
b128c09f BB |
979 | zio->io_stage = stage; |
980 | rv = zio_pipeline[stage](zio); | |
34dc7c2f | 981 | |
b128c09f BB |
982 | if (rv == ZIO_PIPELINE_STOP) |
983 | return; | |
34dc7c2f | 984 | |
b128c09f BB |
985 | ASSERT(rv == ZIO_PIPELINE_CONTINUE); |
986 | } | |
34dc7c2f BB |
987 | } |
988 | ||
b128c09f BB |
989 | /* |
990 | * ========================================================================== | |
991 | * Initiate I/O, either sync or async | |
992 | * ========================================================================== | |
993 | */ | |
994 | int | |
995 | zio_wait(zio_t *zio) | |
34dc7c2f | 996 | { |
b128c09f | 997 | int error; |
34dc7c2f | 998 | |
b128c09f BB |
999 | ASSERT(zio->io_stage == ZIO_STAGE_OPEN); |
1000 | ASSERT(zio->io_executor == NULL); | |
34dc7c2f | 1001 | |
b128c09f | 1002 | zio->io_waiter = curthread; |
34dc7c2f | 1003 | |
b128c09f | 1004 | zio_execute(zio); |
34dc7c2f | 1005 | |
b128c09f BB |
1006 | mutex_enter(&zio->io_lock); |
1007 | while (zio->io_executor != NULL) | |
1008 | cv_wait(&zio->io_cv, &zio->io_lock); | |
1009 | mutex_exit(&zio->io_lock); | |
34dc7c2f | 1010 | |
b128c09f BB |
1011 | error = zio->io_error; |
1012 | zio_destroy(zio); | |
34dc7c2f | 1013 | |
b128c09f BB |
1014 | return (error); |
1015 | } | |
34dc7c2f | 1016 | |
b128c09f BB |
1017 | void |
1018 | zio_nowait(zio_t *zio) | |
1019 | { | |
1020 | ASSERT(zio->io_executor == NULL); | |
34dc7c2f | 1021 | |
b128c09f | 1022 | if (zio->io_parent == NULL && zio->io_child_type == ZIO_CHILD_LOGICAL) { |
34dc7c2f | 1023 | /* |
b128c09f BB |
1024 | * This is a logical async I/O with no parent to wait for it. |
1025 | * Attach it to the pool's global async root zio so that | |
1026 | * spa_unload() has a way of waiting for async I/O to finish. | |
34dc7c2f | 1027 | */ |
b128c09f BB |
1028 | spa_t *spa = zio->io_spa; |
1029 | zio->io_async_root = B_TRUE; | |
1030 | mutex_enter(&spa->spa_async_root_lock); | |
1031 | spa->spa_async_root_count++; | |
1032 | mutex_exit(&spa->spa_async_root_lock); | |
1033 | } | |
34dc7c2f | 1034 | |
b128c09f BB |
1035 | zio_execute(zio); |
1036 | } | |
34dc7c2f | 1037 | |
b128c09f BB |
1038 | /* |
1039 | * ========================================================================== | |
1040 | * Reexecute or suspend/resume failed I/O | |
1041 | * ========================================================================== | |
1042 | */ | |
34dc7c2f | 1043 | |
b128c09f BB |
1044 | static void |
1045 | zio_reexecute(zio_t *pio) | |
1046 | { | |
1047 | zio_t *zio, *zio_next; | |
34dc7c2f | 1048 | |
b128c09f BB |
1049 | pio->io_flags = pio->io_orig_flags; |
1050 | pio->io_stage = pio->io_orig_stage; | |
1051 | pio->io_pipeline = pio->io_orig_pipeline; | |
1052 | pio->io_reexecute = 0; | |
1053 | pio->io_error = 0; | |
1054 | for (int c = 0; c < ZIO_CHILD_TYPES; c++) | |
1055 | pio->io_child_error[c] = 0; | |
34dc7c2f | 1056 | |
b128c09f | 1057 | if (IO_IS_ALLOCATING(pio)) { |
34dc7c2f | 1058 | /* |
b128c09f BB |
1059 | * Remember the failed bp so that the io_ready() callback |
1060 | * can update its accounting upon reexecution. The block | |
1061 | * was already freed in zio_done(); we indicate this with | |
1062 | * a fill count of -1 so that zio_free() knows to skip it. | |
34dc7c2f | 1063 | */ |
b128c09f BB |
1064 | blkptr_t *bp = pio->io_bp; |
1065 | ASSERT(bp->blk_birth == 0 || bp->blk_birth == pio->io_txg); | |
1066 | bp->blk_fill = BLK_FILL_ALREADY_FREED; | |
1067 | pio->io_bp_orig = *bp; | |
1068 | BP_ZERO(bp); | |
1069 | } | |
34dc7c2f | 1070 | |
b128c09f BB |
1071 | /* |
1072 | * As we reexecute pio's children, new children could be created. | |
1073 | * New children go to the head of the io_child list, however, | |
1074 | * so we will (correctly) not reexecute them. The key is that | |
1075 | * the remainder of the io_child list, from 'zio_next' onward, | |
1076 | * cannot be affected by any side effects of reexecuting 'zio'. | |
1077 | */ | |
1078 | for (zio = pio->io_child; zio != NULL; zio = zio_next) { | |
1079 | zio_next = zio->io_sibling_next; | |
1080 | mutex_enter(&pio->io_lock); | |
1081 | pio->io_children[zio->io_child_type][ZIO_WAIT_READY]++; | |
1082 | pio->io_children[zio->io_child_type][ZIO_WAIT_DONE]++; | |
1083 | mutex_exit(&pio->io_lock); | |
1084 | zio_reexecute(zio); | |
34dc7c2f | 1085 | } |
34dc7c2f | 1086 | |
b128c09f BB |
1087 | /* |
1088 | * Now that all children have been reexecuted, execute the parent. | |
1089 | */ | |
1090 | zio_execute(pio); | |
34dc7c2f BB |
1091 | } |
1092 | ||
b128c09f BB |
1093 | void |
1094 | zio_suspend(spa_t *spa, zio_t *zio) | |
34dc7c2f | 1095 | { |
b128c09f BB |
1096 | if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) |
1097 | fm_panic("Pool '%s' has encountered an uncorrectable I/O " | |
1098 | "failure and the failure mode property for this pool " | |
1099 | "is set to panic.", spa_name(spa)); | |
34dc7c2f | 1100 | |
b128c09f | 1101 | zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); |
34dc7c2f | 1102 | |
b128c09f | 1103 | mutex_enter(&spa->spa_suspend_lock); |
34dc7c2f | 1104 | |
b128c09f BB |
1105 | if (spa->spa_suspend_zio_root == NULL) |
1106 | spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, 0); | |
34dc7c2f | 1107 | |
b128c09f | 1108 | spa->spa_suspended = B_TRUE; |
34dc7c2f | 1109 | |
b128c09f BB |
1110 | if (zio != NULL) { |
1111 | ASSERT(zio != spa->spa_suspend_zio_root); | |
1112 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1113 | ASSERT(zio->io_parent == NULL); | |
1114 | ASSERT(zio->io_stage == ZIO_STAGE_DONE); | |
1115 | zio_add_child(spa->spa_suspend_zio_root, zio); | |
1116 | } | |
34dc7c2f | 1117 | |
b128c09f BB |
1118 | mutex_exit(&spa->spa_suspend_lock); |
1119 | } | |
34dc7c2f | 1120 | |
b128c09f BB |
1121 | void |
1122 | zio_resume(spa_t *spa) | |
1123 | { | |
1124 | zio_t *pio, *zio; | |
34dc7c2f BB |
1125 | |
1126 | /* | |
b128c09f | 1127 | * Reexecute all previously suspended i/o. |
34dc7c2f | 1128 | */ |
b128c09f BB |
1129 | mutex_enter(&spa->spa_suspend_lock); |
1130 | spa->spa_suspended = B_FALSE; | |
1131 | cv_broadcast(&spa->spa_suspend_cv); | |
1132 | pio = spa->spa_suspend_zio_root; | |
1133 | spa->spa_suspend_zio_root = NULL; | |
1134 | mutex_exit(&spa->spa_suspend_lock); | |
1135 | ||
1136 | if (pio == NULL) | |
1137 | return; | |
1138 | ||
1139 | while ((zio = pio->io_child) != NULL) { | |
1140 | zio_remove_child(pio, zio); | |
1141 | zio->io_parent = NULL; | |
1142 | zio_reexecute(zio); | |
34dc7c2f BB |
1143 | } |
1144 | ||
b128c09f BB |
1145 | ASSERT(pio->io_children[ZIO_CHILD_LOGICAL][ZIO_WAIT_DONE] == 0); |
1146 | ||
1147 | (void) zio_wait(pio); | |
1148 | } | |
1149 | ||
1150 | void | |
1151 | zio_resume_wait(spa_t *spa) | |
1152 | { | |
1153 | mutex_enter(&spa->spa_suspend_lock); | |
1154 | while (spa_suspended(spa)) | |
1155 | cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); | |
1156 | mutex_exit(&spa->spa_suspend_lock); | |
34dc7c2f BB |
1157 | } |
1158 | ||
1159 | /* | |
1160 | * ========================================================================== | |
b128c09f BB |
1161 | * Gang blocks. |
1162 | * | |
1163 | * A gang block is a collection of small blocks that looks to the DMU | |
1164 | * like one large block. When zio_dva_allocate() cannot find a block | |
1165 | * of the requested size, due to either severe fragmentation or the pool | |
1166 | * being nearly full, it calls zio_write_gang_block() to construct the | |
1167 | * block from smaller fragments. | |
1168 | * | |
1169 | * A gang block consists of a gang header (zio_gbh_phys_t) and up to | |
1170 | * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like | |
1171 | * an indirect block: it's an array of block pointers. It consumes | |
1172 | * only one sector and hence is allocatable regardless of fragmentation. | |
1173 | * The gang header's bps point to its gang members, which hold the data. | |
1174 | * | |
1175 | * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> | |
1176 | * as the verifier to ensure uniqueness of the SHA256 checksum. | |
1177 | * Critically, the gang block bp's blk_cksum is the checksum of the data, | |
1178 | * not the gang header. This ensures that data block signatures (needed for | |
1179 | * deduplication) are independent of how the block is physically stored. | |
1180 | * | |
1181 | * Gang blocks can be nested: a gang member may itself be a gang block. | |
1182 | * Thus every gang block is a tree in which root and all interior nodes are | |
1183 | * gang headers, and the leaves are normal blocks that contain user data. | |
1184 | * The root of the gang tree is called the gang leader. | |
1185 | * | |
1186 | * To perform any operation (read, rewrite, free, claim) on a gang block, | |
1187 | * zio_gang_assemble() first assembles the gang tree (minus data leaves) | |
1188 | * in the io_gang_tree field of the original logical i/o by recursively | |
1189 | * reading the gang leader and all gang headers below it. This yields | |
1190 | * an in-core tree containing the contents of every gang header and the | |
1191 | * bps for every constituent of the gang block. | |
1192 | * | |
1193 | * With the gang tree now assembled, zio_gang_issue() just walks the gang tree | |
1194 | * and invokes a callback on each bp. To free a gang block, zio_gang_issue() | |
1195 | * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. | |
1196 | * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). | |
1197 | * zio_read_gang() is a wrapper around zio_read() that omits reading gang | |
1198 | * headers, since we already have those in io_gang_tree. zio_rewrite_gang() | |
1199 | * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() | |
1200 | * of the gang header plus zio_checksum_compute() of the data to update the | |
1201 | * gang header's blk_cksum as described above. | |
1202 | * | |
1203 | * The two-phase assemble/issue model solves the problem of partial failure -- | |
1204 | * what if you'd freed part of a gang block but then couldn't read the | |
1205 | * gang header for another part? Assembling the entire gang tree first | |
1206 | * ensures that all the necessary gang header I/O has succeeded before | |
1207 | * starting the actual work of free, claim, or write. Once the gang tree | |
1208 | * is assembled, free and claim are in-memory operations that cannot fail. | |
1209 | * | |
1210 | * In the event that a gang write fails, zio_dva_unallocate() walks the | |
1211 | * gang tree to immediately free (i.e. insert back into the space map) | |
1212 | * everything we've allocated. This ensures that we don't get ENOSPC | |
1213 | * errors during repeated suspend/resume cycles due to a flaky device. | |
1214 | * | |
1215 | * Gang rewrites only happen during sync-to-convergence. If we can't assemble | |
1216 | * the gang tree, we won't modify the block, so we can safely defer the free | |
1217 | * (knowing that the block is still intact). If we *can* assemble the gang | |
1218 | * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free | |
1219 | * each constituent bp and we can allocate a new block on the next sync pass. | |
1220 | * | |
1221 | * In all cases, the gang tree allows complete recovery from partial failure. | |
34dc7c2f BB |
1222 | * ========================================================================== |
1223 | */ | |
b128c09f BB |
1224 | |
1225 | static zio_t * | |
1226 | zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
34dc7c2f | 1227 | { |
b128c09f BB |
1228 | if (gn != NULL) |
1229 | return (pio); | |
34dc7c2f | 1230 | |
b128c09f BB |
1231 | return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), |
1232 | NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), | |
1233 | &pio->io_bookmark)); | |
1234 | } | |
1235 | ||
1236 | zio_t * | |
1237 | zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
1238 | { | |
1239 | zio_t *zio; | |
1240 | ||
1241 | if (gn != NULL) { | |
1242 | zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, | |
1243 | gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, | |
1244 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f | 1245 | /* |
b128c09f BB |
1246 | * As we rewrite each gang header, the pipeline will compute |
1247 | * a new gang block header checksum for it; but no one will | |
1248 | * compute a new data checksum, so we do that here. The one | |
1249 | * exception is the gang leader: the pipeline already computed | |
1250 | * its data checksum because that stage precedes gang assembly. | |
1251 | * (Presently, nothing actually uses interior data checksums; | |
1252 | * this is just good hygiene.) | |
34dc7c2f | 1253 | */ |
b128c09f BB |
1254 | if (gn != pio->io_logical->io_gang_tree) { |
1255 | zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), | |
1256 | data, BP_GET_PSIZE(bp)); | |
1257 | } | |
34dc7c2f | 1258 | } else { |
b128c09f BB |
1259 | zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, |
1260 | data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, | |
1261 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f BB |
1262 | } |
1263 | ||
b128c09f BB |
1264 | return (zio); |
1265 | } | |
34dc7c2f | 1266 | |
b128c09f BB |
1267 | /* ARGSUSED */ |
1268 | zio_t * | |
1269 | zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
1270 | { | |
1271 | return (zio_free(pio, pio->io_spa, pio->io_txg, bp, | |
1272 | NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); | |
34dc7c2f BB |
1273 | } |
1274 | ||
b128c09f BB |
1275 | /* ARGSUSED */ |
1276 | zio_t * | |
1277 | zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
34dc7c2f | 1278 | { |
b128c09f BB |
1279 | return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, |
1280 | NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); | |
1281 | } | |
1282 | ||
1283 | static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { | |
1284 | NULL, | |
1285 | zio_read_gang, | |
1286 | zio_rewrite_gang, | |
1287 | zio_free_gang, | |
1288 | zio_claim_gang, | |
1289 | NULL | |
1290 | }; | |
34dc7c2f | 1291 | |
b128c09f | 1292 | static void zio_gang_tree_assemble_done(zio_t *zio); |
34dc7c2f | 1293 | |
b128c09f BB |
1294 | static zio_gang_node_t * |
1295 | zio_gang_node_alloc(zio_gang_node_t **gnpp) | |
1296 | { | |
1297 | zio_gang_node_t *gn; | |
34dc7c2f | 1298 | |
b128c09f | 1299 | ASSERT(*gnpp == NULL); |
34dc7c2f | 1300 | |
b128c09f BB |
1301 | gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); |
1302 | gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); | |
1303 | *gnpp = gn; | |
34dc7c2f | 1304 | |
b128c09f | 1305 | return (gn); |
34dc7c2f BB |
1306 | } |
1307 | ||
34dc7c2f | 1308 | static void |
b128c09f | 1309 | zio_gang_node_free(zio_gang_node_t **gnpp) |
34dc7c2f | 1310 | { |
b128c09f | 1311 | zio_gang_node_t *gn = *gnpp; |
34dc7c2f | 1312 | |
b128c09f BB |
1313 | for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) |
1314 | ASSERT(gn->gn_child[g] == NULL); | |
1315 | ||
1316 | zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); | |
1317 | kmem_free(gn, sizeof (*gn)); | |
1318 | *gnpp = NULL; | |
34dc7c2f BB |
1319 | } |
1320 | ||
b128c09f BB |
1321 | static void |
1322 | zio_gang_tree_free(zio_gang_node_t **gnpp) | |
34dc7c2f | 1323 | { |
b128c09f | 1324 | zio_gang_node_t *gn = *gnpp; |
34dc7c2f | 1325 | |
b128c09f BB |
1326 | if (gn == NULL) |
1327 | return; | |
34dc7c2f | 1328 | |
b128c09f BB |
1329 | for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) |
1330 | zio_gang_tree_free(&gn->gn_child[g]); | |
34dc7c2f | 1331 | |
b128c09f | 1332 | zio_gang_node_free(gnpp); |
34dc7c2f BB |
1333 | } |
1334 | ||
b128c09f BB |
1335 | static void |
1336 | zio_gang_tree_assemble(zio_t *lio, blkptr_t *bp, zio_gang_node_t **gnpp) | |
34dc7c2f | 1337 | { |
b128c09f BB |
1338 | zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); |
1339 | ||
1340 | ASSERT(lio->io_logical == lio); | |
1341 | ASSERT(BP_IS_GANG(bp)); | |
34dc7c2f | 1342 | |
b128c09f BB |
1343 | zio_nowait(zio_read(lio, lio->io_spa, bp, gn->gn_gbh, |
1344 | SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, | |
1345 | lio->io_priority, ZIO_GANG_CHILD_FLAGS(lio), &lio->io_bookmark)); | |
1346 | } | |
34dc7c2f | 1347 | |
b128c09f BB |
1348 | static void |
1349 | zio_gang_tree_assemble_done(zio_t *zio) | |
1350 | { | |
1351 | zio_t *lio = zio->io_logical; | |
1352 | zio_gang_node_t *gn = zio->io_private; | |
1353 | blkptr_t *bp = zio->io_bp; | |
34dc7c2f | 1354 | |
b128c09f BB |
1355 | ASSERT(zio->io_parent == lio); |
1356 | ASSERT(zio->io_child == NULL); | |
34dc7c2f | 1357 | |
b128c09f BB |
1358 | if (zio->io_error) |
1359 | return; | |
34dc7c2f | 1360 | |
b128c09f BB |
1361 | if (BP_SHOULD_BYTESWAP(bp)) |
1362 | byteswap_uint64_array(zio->io_data, zio->io_size); | |
34dc7c2f | 1363 | |
b128c09f BB |
1364 | ASSERT(zio->io_data == gn->gn_gbh); |
1365 | ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); | |
1366 | ASSERT(gn->gn_gbh->zg_tail.zbt_magic == ZBT_MAGIC); | |
34dc7c2f | 1367 | |
b128c09f BB |
1368 | for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
1369 | blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; | |
1370 | if (!BP_IS_GANG(gbp)) | |
1371 | continue; | |
1372 | zio_gang_tree_assemble(lio, gbp, &gn->gn_child[g]); | |
1373 | } | |
34dc7c2f BB |
1374 | } |
1375 | ||
b128c09f BB |
1376 | static void |
1377 | zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) | |
34dc7c2f | 1378 | { |
b128c09f BB |
1379 | zio_t *lio = pio->io_logical; |
1380 | zio_t *zio; | |
34dc7c2f | 1381 | |
b128c09f BB |
1382 | ASSERT(BP_IS_GANG(bp) == !!gn); |
1383 | ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(lio->io_bp)); | |
1384 | ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == lio->io_gang_tree); | |
34dc7c2f | 1385 | |
b128c09f BB |
1386 | /* |
1387 | * If you're a gang header, your data is in gn->gn_gbh. | |
1388 | * If you're a gang member, your data is in 'data' and gn == NULL. | |
1389 | */ | |
1390 | zio = zio_gang_issue_func[lio->io_type](pio, bp, gn, data); | |
34dc7c2f | 1391 | |
b128c09f BB |
1392 | if (gn != NULL) { |
1393 | ASSERT(gn->gn_gbh->zg_tail.zbt_magic == ZBT_MAGIC); | |
34dc7c2f | 1394 | |
b128c09f BB |
1395 | for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
1396 | blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; | |
1397 | if (BP_IS_HOLE(gbp)) | |
1398 | continue; | |
1399 | zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); | |
1400 | data = (char *)data + BP_GET_PSIZE(gbp); | |
1401 | } | |
34dc7c2f BB |
1402 | } |
1403 | ||
b128c09f BB |
1404 | if (gn == lio->io_gang_tree) |
1405 | ASSERT3P((char *)lio->io_data + lio->io_size, ==, data); | |
34dc7c2f | 1406 | |
b128c09f BB |
1407 | if (zio != pio) |
1408 | zio_nowait(zio); | |
34dc7c2f BB |
1409 | } |
1410 | ||
1411 | static int | |
b128c09f | 1412 | zio_gang_assemble(zio_t *zio) |
34dc7c2f | 1413 | { |
b128c09f | 1414 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 1415 | |
b128c09f | 1416 | ASSERT(BP_IS_GANG(bp) && zio == zio->io_logical); |
34dc7c2f | 1417 | |
b128c09f | 1418 | zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); |
34dc7c2f BB |
1419 | |
1420 | return (ZIO_PIPELINE_CONTINUE); | |
1421 | } | |
1422 | ||
1423 | static int | |
b128c09f | 1424 | zio_gang_issue(zio_t *zio) |
34dc7c2f | 1425 | { |
b128c09f BB |
1426 | zio_t *lio = zio->io_logical; |
1427 | blkptr_t *bp = zio->io_bp; | |
34dc7c2f | 1428 | |
b128c09f BB |
1429 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) |
1430 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 1431 | |
b128c09f | 1432 | ASSERT(BP_IS_GANG(bp) && zio == lio); |
34dc7c2f | 1433 | |
b128c09f BB |
1434 | if (zio->io_child_error[ZIO_CHILD_GANG] == 0) |
1435 | zio_gang_tree_issue(lio, lio->io_gang_tree, bp, lio->io_data); | |
1436 | else | |
1437 | zio_gang_tree_free(&lio->io_gang_tree); | |
34dc7c2f | 1438 | |
b128c09f | 1439 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
34dc7c2f BB |
1440 | |
1441 | return (ZIO_PIPELINE_CONTINUE); | |
1442 | } | |
1443 | ||
1444 | static void | |
b128c09f | 1445 | zio_write_gang_member_ready(zio_t *zio) |
34dc7c2f BB |
1446 | { |
1447 | zio_t *pio = zio->io_parent; | |
b128c09f | 1448 | zio_t *lio = zio->io_logical; |
34dc7c2f BB |
1449 | dva_t *cdva = zio->io_bp->blk_dva; |
1450 | dva_t *pdva = pio->io_bp->blk_dva; | |
1451 | uint64_t asize; | |
34dc7c2f | 1452 | |
b128c09f BB |
1453 | if (BP_IS_HOLE(zio->io_bp)) |
1454 | return; | |
1455 | ||
1456 | ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); | |
1457 | ||
1458 | ASSERT(zio->io_child_type == ZIO_CHILD_GANG); | |
1459 | ASSERT3U(zio->io_prop.zp_ndvas, ==, lio->io_prop.zp_ndvas); | |
1460 | ASSERT3U(zio->io_prop.zp_ndvas, <=, BP_GET_NDVAS(zio->io_bp)); | |
1461 | ASSERT3U(pio->io_prop.zp_ndvas, <=, BP_GET_NDVAS(pio->io_bp)); | |
34dc7c2f | 1462 | ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); |
34dc7c2f BB |
1463 | |
1464 | mutex_enter(&pio->io_lock); | |
b128c09f | 1465 | for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { |
34dc7c2f BB |
1466 | ASSERT(DVA_GET_GANG(&pdva[d])); |
1467 | asize = DVA_GET_ASIZE(&pdva[d]); | |
1468 | asize += DVA_GET_ASIZE(&cdva[d]); | |
1469 | DVA_SET_ASIZE(&pdva[d], asize); | |
1470 | } | |
1471 | mutex_exit(&pio->io_lock); | |
1472 | } | |
1473 | ||
1474 | static int | |
b128c09f | 1475 | zio_write_gang_block(zio_t *pio) |
34dc7c2f | 1476 | { |
b128c09f BB |
1477 | spa_t *spa = pio->io_spa; |
1478 | blkptr_t *bp = pio->io_bp; | |
1479 | zio_t *lio = pio->io_logical; | |
1480 | zio_t *zio; | |
1481 | zio_gang_node_t *gn, **gnpp; | |
34dc7c2f | 1482 | zio_gbh_phys_t *gbh; |
b128c09f BB |
1483 | uint64_t txg = pio->io_txg; |
1484 | uint64_t resid = pio->io_size; | |
1485 | uint64_t lsize; | |
1486 | int ndvas = lio->io_prop.zp_ndvas; | |
34dc7c2f | 1487 | int gbh_ndvas = MIN(ndvas + 1, spa_max_replication(spa)); |
b128c09f | 1488 | zio_prop_t zp; |
34dc7c2f | 1489 | int error; |
34dc7c2f | 1490 | |
b128c09f BB |
1491 | error = metaslab_alloc(spa, spa->spa_normal_class, SPA_GANGBLOCKSIZE, |
1492 | bp, gbh_ndvas, txg, pio == lio ? NULL : lio->io_bp, | |
1493 | METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); | |
34dc7c2f | 1494 | if (error) { |
b128c09f | 1495 | pio->io_error = error; |
34dc7c2f BB |
1496 | return (ZIO_PIPELINE_CONTINUE); |
1497 | } | |
1498 | ||
b128c09f BB |
1499 | if (pio == lio) { |
1500 | gnpp = &lio->io_gang_tree; | |
1501 | } else { | |
1502 | gnpp = pio->io_private; | |
1503 | ASSERT(pio->io_ready == zio_write_gang_member_ready); | |
34dc7c2f BB |
1504 | } |
1505 | ||
b128c09f BB |
1506 | gn = zio_gang_node_alloc(gnpp); |
1507 | gbh = gn->gn_gbh; | |
1508 | bzero(gbh, SPA_GANGBLOCKSIZE); | |
34dc7c2f | 1509 | |
b128c09f BB |
1510 | /* |
1511 | * Create the gang header. | |
1512 | */ | |
1513 | zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, | |
1514 | pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f | 1515 | |
b128c09f BB |
1516 | /* |
1517 | * Create and nowait the gang children. | |
1518 | */ | |
1519 | for (int g = 0; resid != 0; resid -= lsize, g++) { | |
1520 | lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), | |
1521 | SPA_MINBLOCKSIZE); | |
1522 | ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); | |
1523 | ||
1524 | zp.zp_checksum = lio->io_prop.zp_checksum; | |
1525 | zp.zp_compress = ZIO_COMPRESS_OFF; | |
1526 | zp.zp_type = DMU_OT_NONE; | |
1527 | zp.zp_level = 0; | |
1528 | zp.zp_ndvas = lio->io_prop.zp_ndvas; | |
1529 | ||
1530 | zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], | |
1531 | (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, | |
1532 | zio_write_gang_member_ready, NULL, &gn->gn_child[g], | |
1533 | pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), | |
1534 | &pio->io_bookmark)); | |
1535 | } | |
34dc7c2f BB |
1536 | |
1537 | /* | |
b128c09f | 1538 | * Set pio's pipeline to just wait for zio to finish. |
34dc7c2f | 1539 | */ |
b128c09f BB |
1540 | pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
1541 | ||
1542 | zio_nowait(zio); | |
1543 | ||
1544 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f BB |
1545 | } |
1546 | ||
1547 | /* | |
1548 | * ========================================================================== | |
1549 | * Allocate and free blocks | |
1550 | * ========================================================================== | |
1551 | */ | |
b128c09f | 1552 | |
34dc7c2f BB |
1553 | static int |
1554 | zio_dva_allocate(zio_t *zio) | |
1555 | { | |
1556 | spa_t *spa = zio->io_spa; | |
1557 | metaslab_class_t *mc = spa->spa_normal_class; | |
1558 | blkptr_t *bp = zio->io_bp; | |
1559 | int error; | |
1560 | ||
1561 | ASSERT(BP_IS_HOLE(bp)); | |
1562 | ASSERT3U(BP_GET_NDVAS(bp), ==, 0); | |
b128c09f BB |
1563 | ASSERT3U(zio->io_prop.zp_ndvas, >, 0); |
1564 | ASSERT3U(zio->io_prop.zp_ndvas, <=, spa_max_replication(spa)); | |
34dc7c2f BB |
1565 | ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); |
1566 | ||
b128c09f BB |
1567 | error = metaslab_alloc(spa, mc, zio->io_size, bp, |
1568 | zio->io_prop.zp_ndvas, zio->io_txg, NULL, 0); | |
34dc7c2f | 1569 | |
b128c09f BB |
1570 | if (error) { |
1571 | if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) | |
1572 | return (zio_write_gang_block(zio)); | |
34dc7c2f BB |
1573 | zio->io_error = error; |
1574 | } | |
1575 | ||
1576 | return (ZIO_PIPELINE_CONTINUE); | |
1577 | } | |
1578 | ||
1579 | static int | |
1580 | zio_dva_free(zio_t *zio) | |
1581 | { | |
b128c09f | 1582 | metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); |
34dc7c2f BB |
1583 | |
1584 | return (ZIO_PIPELINE_CONTINUE); | |
1585 | } | |
1586 | ||
1587 | static int | |
1588 | zio_dva_claim(zio_t *zio) | |
1589 | { | |
b128c09f BB |
1590 | int error; |
1591 | ||
1592 | error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); | |
1593 | if (error) | |
1594 | zio->io_error = error; | |
34dc7c2f BB |
1595 | |
1596 | return (ZIO_PIPELINE_CONTINUE); | |
1597 | } | |
1598 | ||
b128c09f BB |
1599 | /* |
1600 | * Undo an allocation. This is used by zio_done() when an I/O fails | |
1601 | * and we want to give back the block we just allocated. | |
1602 | * This handles both normal blocks and gang blocks. | |
1603 | */ | |
1604 | static void | |
1605 | zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) | |
1606 | { | |
1607 | spa_t *spa = zio->io_spa; | |
1608 | boolean_t now = !(zio->io_flags & ZIO_FLAG_IO_REWRITE); | |
1609 | ||
1610 | ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); | |
1611 | ||
1612 | if (zio->io_bp == bp && !now) { | |
1613 | /* | |
1614 | * This is a rewrite for sync-to-convergence. | |
1615 | * We can't do a metaslab_free(NOW) because bp wasn't allocated | |
1616 | * during this sync pass, which means that metaslab_sync() | |
1617 | * already committed the allocation. | |
1618 | */ | |
1619 | ASSERT(DVA_EQUAL(BP_IDENTITY(bp), | |
1620 | BP_IDENTITY(&zio->io_bp_orig))); | |
1621 | ASSERT(spa_sync_pass(spa) > 1); | |
1622 | ||
1623 | if (BP_IS_GANG(bp) && gn == NULL) { | |
1624 | /* | |
1625 | * This is a gang leader whose gang header(s) we | |
1626 | * couldn't read now, so defer the free until later. | |
1627 | * The block should still be intact because without | |
1628 | * the headers, we'd never even start the rewrite. | |
1629 | */ | |
1630 | bplist_enqueue_deferred(&spa->spa_sync_bplist, bp); | |
1631 | return; | |
1632 | } | |
1633 | } | |
1634 | ||
1635 | if (!BP_IS_HOLE(bp)) | |
1636 | metaslab_free(spa, bp, bp->blk_birth, now); | |
1637 | ||
1638 | if (gn != NULL) { | |
1639 | for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { | |
1640 | zio_dva_unallocate(zio, gn->gn_child[g], | |
1641 | &gn->gn_gbh->zg_blkptr[g]); | |
1642 | } | |
1643 | } | |
1644 | } | |
1645 | ||
1646 | /* | |
1647 | * Try to allocate an intent log block. Return 0 on success, errno on failure. | |
1648 | */ | |
1649 | int | |
1650 | zio_alloc_blk(spa_t *spa, uint64_t size, blkptr_t *new_bp, blkptr_t *old_bp, | |
1651 | uint64_t txg) | |
1652 | { | |
1653 | int error; | |
1654 | ||
1655 | error = metaslab_alloc(spa, spa->spa_log_class, size, | |
1656 | new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); | |
1657 | ||
1658 | if (error) | |
1659 | error = metaslab_alloc(spa, spa->spa_normal_class, size, | |
1660 | new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); | |
1661 | ||
1662 | if (error == 0) { | |
1663 | BP_SET_LSIZE(new_bp, size); | |
1664 | BP_SET_PSIZE(new_bp, size); | |
1665 | BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); | |
1666 | BP_SET_CHECKSUM(new_bp, ZIO_CHECKSUM_ZILOG); | |
1667 | BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); | |
1668 | BP_SET_LEVEL(new_bp, 0); | |
1669 | BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); | |
1670 | } | |
1671 | ||
1672 | return (error); | |
1673 | } | |
1674 | ||
1675 | /* | |
1676 | * Free an intent log block. We know it can't be a gang block, so there's | |
1677 | * nothing to do except metaslab_free() it. | |
1678 | */ | |
1679 | void | |
1680 | zio_free_blk(spa_t *spa, blkptr_t *bp, uint64_t txg) | |
1681 | { | |
1682 | ASSERT(!BP_IS_GANG(bp)); | |
1683 | ||
1684 | metaslab_free(spa, bp, txg, B_FALSE); | |
1685 | } | |
1686 | ||
34dc7c2f BB |
1687 | /* |
1688 | * ========================================================================== | |
1689 | * Read and write to physical devices | |
1690 | * ========================================================================== | |
1691 | */ | |
1692 | ||
b128c09f BB |
1693 | static void |
1694 | zio_vdev_io_probe_done(zio_t *zio) | |
1695 | { | |
1696 | zio_t *dio; | |
1697 | vdev_t *vd = zio->io_private; | |
1698 | ||
1699 | mutex_enter(&vd->vdev_probe_lock); | |
1700 | ASSERT(vd->vdev_probe_zio == zio); | |
1701 | vd->vdev_probe_zio = NULL; | |
1702 | mutex_exit(&vd->vdev_probe_lock); | |
1703 | ||
1704 | while ((dio = zio->io_delegate_list) != NULL) { | |
1705 | zio->io_delegate_list = dio->io_delegate_next; | |
1706 | dio->io_delegate_next = NULL; | |
1707 | if (!vdev_accessible(vd, dio)) | |
1708 | dio->io_error = ENXIO; | |
1709 | zio_execute(dio); | |
1710 | } | |
1711 | } | |
1712 | ||
1713 | /* | |
1714 | * Probe the device to determine whether I/O failure is specific to this | |
1715 | * zio (e.g. a bad sector) or affects the entire vdev (e.g. unplugged). | |
1716 | */ | |
1717 | static int | |
1718 | zio_vdev_io_probe(zio_t *zio) | |
1719 | { | |
1720 | vdev_t *vd = zio->io_vd; | |
1721 | zio_t *pio = NULL; | |
1722 | boolean_t created_pio = B_FALSE; | |
1723 | ||
1724 | /* | |
1725 | * Don't probe the probe. | |
1726 | */ | |
1727 | if (zio->io_flags & ZIO_FLAG_PROBE) | |
1728 | return (ZIO_PIPELINE_CONTINUE); | |
1729 | ||
1730 | /* | |
1731 | * To prevent 'probe storms' when a device fails, we create | |
1732 | * just one probe i/o at a time. All zios that want to probe | |
1733 | * this vdev will join the probe zio's io_delegate_list. | |
1734 | */ | |
1735 | mutex_enter(&vd->vdev_probe_lock); | |
1736 | ||
1737 | if ((pio = vd->vdev_probe_zio) == NULL) { | |
1738 | vd->vdev_probe_zio = pio = zio_root(zio->io_spa, | |
1739 | zio_vdev_io_probe_done, vd, ZIO_FLAG_CANFAIL); | |
1740 | created_pio = B_TRUE; | |
1741 | vd->vdev_probe_wanted = B_TRUE; | |
1742 | spa_async_request(zio->io_spa, SPA_ASYNC_PROBE); | |
1743 | } | |
1744 | ||
1745 | zio->io_delegate_next = pio->io_delegate_list; | |
1746 | pio->io_delegate_list = zio; | |
1747 | ||
1748 | mutex_exit(&vd->vdev_probe_lock); | |
1749 | ||
1750 | if (created_pio) { | |
1751 | zio_nowait(vdev_probe(vd, pio)); | |
1752 | zio_nowait(pio); | |
1753 | } | |
1754 | ||
1755 | return (ZIO_PIPELINE_STOP); | |
1756 | } | |
1757 | ||
34dc7c2f BB |
1758 | static int |
1759 | zio_vdev_io_start(zio_t *zio) | |
1760 | { | |
1761 | vdev_t *vd = zio->io_vd; | |
34dc7c2f BB |
1762 | uint64_t align; |
1763 | spa_t *spa = zio->io_spa; | |
1764 | ||
b128c09f BB |
1765 | ASSERT(zio->io_error == 0); |
1766 | ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); | |
34dc7c2f | 1767 | |
b128c09f BB |
1768 | if (vd == NULL) { |
1769 | if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) | |
1770 | spa_config_enter(spa, SCL_ZIO, zio, RW_READER); | |
34dc7c2f | 1771 | |
b128c09f BB |
1772 | /* |
1773 | * The mirror_ops handle multiple DVAs in a single BP. | |
1774 | */ | |
1775 | return (vdev_mirror_ops.vdev_op_io_start(zio)); | |
34dc7c2f BB |
1776 | } |
1777 | ||
b128c09f BB |
1778 | align = 1ULL << vd->vdev_top->vdev_ashift; |
1779 | ||
34dc7c2f BB |
1780 | if (P2PHASE(zio->io_size, align) != 0) { |
1781 | uint64_t asize = P2ROUNDUP(zio->io_size, align); | |
1782 | char *abuf = zio_buf_alloc(asize); | |
b128c09f | 1783 | ASSERT(vd == vd->vdev_top); |
34dc7c2f BB |
1784 | if (zio->io_type == ZIO_TYPE_WRITE) { |
1785 | bcopy(zio->io_data, abuf, zio->io_size); | |
1786 | bzero(abuf + zio->io_size, asize - zio->io_size); | |
1787 | } | |
b128c09f | 1788 | zio_push_transform(zio, abuf, asize, asize, zio_subblock); |
34dc7c2f BB |
1789 | } |
1790 | ||
1791 | ASSERT(P2PHASE(zio->io_offset, align) == 0); | |
1792 | ASSERT(P2PHASE(zio->io_size, align) == 0); | |
34dc7c2f BB |
1793 | ASSERT(zio->io_type != ZIO_TYPE_WRITE || (spa_mode & FWRITE)); |
1794 | ||
b128c09f BB |
1795 | if (vd->vdev_ops->vdev_op_leaf && |
1796 | (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { | |
1797 | ||
1798 | if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) | |
1799 | return (ZIO_PIPELINE_STOP); | |
1800 | ||
1801 | if ((zio = vdev_queue_io(zio)) == NULL) | |
1802 | return (ZIO_PIPELINE_STOP); | |
1803 | ||
1804 | if (!vdev_accessible(vd, zio)) { | |
1805 | zio->io_error = ENXIO; | |
1806 | zio_interrupt(zio); | |
1807 | return (ZIO_PIPELINE_STOP); | |
1808 | } | |
1809 | ||
1810 | } | |
1811 | ||
34dc7c2f BB |
1812 | return (vd->vdev_ops->vdev_op_io_start(zio)); |
1813 | } | |
1814 | ||
1815 | static int | |
1816 | zio_vdev_io_done(zio_t *zio) | |
1817 | { | |
b128c09f BB |
1818 | vdev_t *vd = zio->io_vd; |
1819 | vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; | |
1820 | boolean_t unexpected_error = B_FALSE; | |
34dc7c2f | 1821 | |
b128c09f BB |
1822 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) |
1823 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 1824 | |
b128c09f BB |
1825 | ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); |
1826 | ||
1827 | if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { | |
1828 | ||
1829 | vdev_queue_io_done(zio); | |
1830 | ||
1831 | if (zio->io_type == ZIO_TYPE_WRITE) | |
1832 | vdev_cache_write(zio); | |
1833 | ||
1834 | if (zio_injection_enabled && zio->io_error == 0) | |
1835 | zio->io_error = zio_handle_device_injection(vd, EIO); | |
1836 | ||
1837 | if (zio_injection_enabled && zio->io_error == 0) | |
1838 | zio->io_error = zio_handle_label_injection(zio, EIO); | |
1839 | ||
1840 | if (zio->io_error) { | |
1841 | if (!vdev_accessible(vd, zio)) { | |
1842 | zio->io_error = ENXIO; | |
1843 | } else { | |
1844 | unexpected_error = B_TRUE; | |
1845 | } | |
1846 | } | |
1847 | } | |
1848 | ||
1849 | ops->vdev_op_io_done(zio); | |
34dc7c2f | 1850 | |
b128c09f BB |
1851 | if (unexpected_error) |
1852 | return (zio_vdev_io_probe(zio)); | |
34dc7c2f | 1853 | |
b128c09f | 1854 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
1855 | } |
1856 | ||
1857 | static int | |
1858 | zio_vdev_io_assess(zio_t *zio) | |
1859 | { | |
1860 | vdev_t *vd = zio->io_vd; | |
b128c09f BB |
1861 | |
1862 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) | |
1863 | return (ZIO_PIPELINE_STOP); | |
1864 | ||
1865 | if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) | |
1866 | spa_config_exit(zio->io_spa, SCL_ZIO, zio); | |
1867 | ||
1868 | if (zio->io_vsd != NULL) { | |
1869 | zio->io_vsd_free(zio); | |
1870 | zio->io_vsd = NULL; | |
34dc7c2f BB |
1871 | } |
1872 | ||
b128c09f | 1873 | if (zio_injection_enabled && zio->io_error == 0) |
34dc7c2f BB |
1874 | zio->io_error = zio_handle_fault_injection(zio, EIO); |
1875 | ||
1876 | /* | |
1877 | * If the I/O failed, determine whether we should attempt to retry it. | |
1878 | */ | |
b128c09f BB |
1879 | if (zio->io_error && vd == NULL && |
1880 | !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { | |
1881 | ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ | |
1882 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ | |
34dc7c2f | 1883 | zio->io_error = 0; |
b128c09f BB |
1884 | zio->io_flags |= ZIO_FLAG_IO_RETRY | |
1885 | ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; | |
34dc7c2f | 1886 | zio->io_stage = ZIO_STAGE_VDEV_IO_START - 1; |
b128c09f BB |
1887 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); |
1888 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
1889 | } |
1890 | ||
b128c09f BB |
1891 | /* |
1892 | * If we got an error on a leaf device, convert it to ENXIO | |
1893 | * if the device is not accessible at all. | |
1894 | */ | |
1895 | if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && | |
1896 | !vdev_accessible(vd, zio)) | |
1897 | zio->io_error = ENXIO; | |
1898 | ||
1899 | /* | |
1900 | * If we can't write to an interior vdev (mirror or RAID-Z), | |
1901 | * set vdev_cant_write so that we stop trying to allocate from it. | |
1902 | */ | |
1903 | if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && | |
1904 | vd != NULL && !vd->vdev_ops->vdev_op_leaf) | |
1905 | vd->vdev_cant_write = B_TRUE; | |
1906 | ||
1907 | if (zio->io_error) | |
1908 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
1909 | ||
34dc7c2f BB |
1910 | return (ZIO_PIPELINE_CONTINUE); |
1911 | } | |
1912 | ||
1913 | void | |
1914 | zio_vdev_io_reissue(zio_t *zio) | |
1915 | { | |
1916 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); | |
1917 | ASSERT(zio->io_error == 0); | |
1918 | ||
1919 | zio->io_stage--; | |
1920 | } | |
1921 | ||
1922 | void | |
1923 | zio_vdev_io_redone(zio_t *zio) | |
1924 | { | |
1925 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); | |
1926 | ||
1927 | zio->io_stage--; | |
1928 | } | |
1929 | ||
1930 | void | |
1931 | zio_vdev_io_bypass(zio_t *zio) | |
1932 | { | |
1933 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); | |
1934 | ASSERT(zio->io_error == 0); | |
1935 | ||
1936 | zio->io_flags |= ZIO_FLAG_IO_BYPASS; | |
1937 | zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS - 1; | |
1938 | } | |
1939 | ||
1940 | /* | |
1941 | * ========================================================================== | |
1942 | * Generate and verify checksums | |
1943 | * ========================================================================== | |
1944 | */ | |
1945 | static int | |
1946 | zio_checksum_generate(zio_t *zio) | |
1947 | { | |
34dc7c2f | 1948 | blkptr_t *bp = zio->io_bp; |
b128c09f | 1949 | enum zio_checksum checksum; |
34dc7c2f | 1950 | |
b128c09f BB |
1951 | if (bp == NULL) { |
1952 | /* | |
1953 | * This is zio_write_phys(). | |
1954 | * We're either generating a label checksum, or none at all. | |
1955 | */ | |
1956 | checksum = zio->io_prop.zp_checksum; | |
34dc7c2f | 1957 | |
b128c09f BB |
1958 | if (checksum == ZIO_CHECKSUM_OFF) |
1959 | return (ZIO_PIPELINE_CONTINUE); | |
1960 | ||
1961 | ASSERT(checksum == ZIO_CHECKSUM_LABEL); | |
1962 | } else { | |
1963 | if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { | |
1964 | ASSERT(!IO_IS_ALLOCATING(zio)); | |
1965 | checksum = ZIO_CHECKSUM_GANG_HEADER; | |
1966 | } else { | |
1967 | checksum = BP_GET_CHECKSUM(bp); | |
1968 | } | |
1969 | } | |
34dc7c2f | 1970 | |
b128c09f | 1971 | zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); |
34dc7c2f BB |
1972 | |
1973 | return (ZIO_PIPELINE_CONTINUE); | |
1974 | } | |
1975 | ||
1976 | static int | |
b128c09f | 1977 | zio_checksum_verify(zio_t *zio) |
34dc7c2f | 1978 | { |
b128c09f BB |
1979 | blkptr_t *bp = zio->io_bp; |
1980 | int error; | |
34dc7c2f | 1981 | |
b128c09f BB |
1982 | if (bp == NULL) { |
1983 | /* | |
1984 | * This is zio_read_phys(). | |
1985 | * We're either verifying a label checksum, or nothing at all. | |
1986 | */ | |
1987 | if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) | |
1988 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f | 1989 | |
b128c09f BB |
1990 | ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); |
1991 | } | |
34dc7c2f | 1992 | |
b128c09f BB |
1993 | if ((error = zio_checksum_error(zio)) != 0) { |
1994 | zio->io_error = error; | |
1995 | if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { | |
34dc7c2f BB |
1996 | zfs_ereport_post(FM_EREPORT_ZFS_CHECKSUM, |
1997 | zio->io_spa, zio->io_vd, zio, 0, 0); | |
b128c09f | 1998 | } |
34dc7c2f BB |
1999 | } |
2000 | ||
2001 | return (ZIO_PIPELINE_CONTINUE); | |
2002 | } | |
2003 | ||
2004 | /* | |
2005 | * Called by RAID-Z to ensure we don't compute the checksum twice. | |
2006 | */ | |
2007 | void | |
2008 | zio_checksum_verified(zio_t *zio) | |
2009 | { | |
2010 | zio->io_pipeline &= ~(1U << ZIO_STAGE_CHECKSUM_VERIFY); | |
2011 | } | |
2012 | ||
2013 | /* | |
b128c09f BB |
2014 | * ========================================================================== |
2015 | * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. | |
2016 | * An error of 0 indictes success. ENXIO indicates whole-device failure, | |
2017 | * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO | |
2018 | * indicate errors that are specific to one I/O, and most likely permanent. | |
2019 | * Any other error is presumed to be worse because we weren't expecting it. | |
2020 | * ========================================================================== | |
34dc7c2f | 2021 | */ |
b128c09f BB |
2022 | int |
2023 | zio_worst_error(int e1, int e2) | |
34dc7c2f | 2024 | { |
b128c09f BB |
2025 | static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; |
2026 | int r1, r2; | |
2027 | ||
2028 | for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) | |
2029 | if (e1 == zio_error_rank[r1]) | |
2030 | break; | |
34dc7c2f | 2031 | |
b128c09f BB |
2032 | for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) |
2033 | if (e2 == zio_error_rank[r2]) | |
2034 | break; | |
2035 | ||
2036 | return (r1 > r2 ? e1 : e2); | |
34dc7c2f BB |
2037 | } |
2038 | ||
2039 | /* | |
2040 | * ========================================================================== | |
b128c09f | 2041 | * I/O completion |
34dc7c2f BB |
2042 | * ========================================================================== |
2043 | */ | |
b128c09f BB |
2044 | static int |
2045 | zio_ready(zio_t *zio) | |
34dc7c2f | 2046 | { |
b128c09f BB |
2047 | blkptr_t *bp = zio->io_bp; |
2048 | zio_t *pio = zio->io_parent; | |
34dc7c2f | 2049 | |
b128c09f BB |
2050 | if (zio->io_ready) { |
2051 | if (BP_IS_GANG(bp) && | |
2052 | zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY)) | |
2053 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 2054 | |
b128c09f BB |
2055 | ASSERT(IO_IS_ALLOCATING(zio)); |
2056 | ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); | |
2057 | ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); | |
34dc7c2f | 2058 | |
b128c09f BB |
2059 | zio->io_ready(zio); |
2060 | } | |
34dc7c2f | 2061 | |
b128c09f BB |
2062 | if (bp != NULL && bp != &zio->io_bp_copy) |
2063 | zio->io_bp_copy = *bp; | |
34dc7c2f | 2064 | |
b128c09f BB |
2065 | if (zio->io_error) |
2066 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
34dc7c2f | 2067 | |
b128c09f BB |
2068 | if (pio != NULL) |
2069 | zio_notify_parent(pio, zio, ZIO_WAIT_READY); | |
34dc7c2f | 2070 | |
b128c09f | 2071 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
2072 | } |
2073 | ||
b128c09f BB |
2074 | static int |
2075 | zio_done(zio_t *zio) | |
34dc7c2f | 2076 | { |
b128c09f BB |
2077 | spa_t *spa = zio->io_spa; |
2078 | zio_t *pio = zio->io_parent; | |
2079 | zio_t *lio = zio->io_logical; | |
2080 | blkptr_t *bp = zio->io_bp; | |
2081 | vdev_t *vd = zio->io_vd; | |
2082 | uint64_t psize = zio->io_size; | |
34dc7c2f | 2083 | |
b128c09f BB |
2084 | /* |
2085 | * If our of children haven't all completed, | |
2086 | * wait for them and then repeat this pipeline stage. | |
2087 | */ | |
2088 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || | |
2089 | zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || | |
2090 | zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) | |
2091 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 2092 | |
b128c09f BB |
2093 | for (int c = 0; c < ZIO_CHILD_TYPES; c++) |
2094 | for (int w = 0; w < ZIO_WAIT_TYPES; w++) | |
2095 | ASSERT(zio->io_children[c][w] == 0); | |
2096 | ||
2097 | if (bp != NULL) { | |
2098 | ASSERT(bp->blk_pad[0] == 0); | |
2099 | ASSERT(bp->blk_pad[1] == 0); | |
2100 | ASSERT(bp->blk_pad[2] == 0); | |
2101 | ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || | |
2102 | (pio != NULL && bp == pio->io_bp)); | |
2103 | if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && | |
2104 | !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { | |
2105 | ASSERT(!BP_SHOULD_BYTESWAP(bp)); | |
2106 | ASSERT3U(zio->io_prop.zp_ndvas, <=, BP_GET_NDVAS(bp)); | |
2107 | ASSERT(BP_COUNT_GANG(bp) == 0 || | |
2108 | (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); | |
2109 | } | |
2110 | } | |
2111 | ||
2112 | /* | |
2113 | * If there were child vdev or gang errors, they apply to us now. | |
2114 | */ | |
2115 | zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); | |
2116 | zio_inherit_child_errors(zio, ZIO_CHILD_GANG); | |
2117 | ||
2118 | zio_pop_transforms(zio); /* note: may set zio->io_error */ | |
2119 | ||
2120 | vdev_stat_update(zio, psize); | |
2121 | ||
2122 | if (zio->io_error) { | |
2123 | /* | |
2124 | * If this I/O is attached to a particular vdev, | |
2125 | * generate an error message describing the I/O failure | |
2126 | * at the block level. We ignore these errors if the | |
2127 | * device is currently unavailable. | |
2128 | */ | |
2129 | if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) | |
2130 | zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, zio, 0, 0); | |
34dc7c2f | 2131 | |
b128c09f BB |
2132 | if ((zio->io_error == EIO || |
2133 | !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) && zio == lio) { | |
2134 | /* | |
2135 | * For logical I/O requests, tell the SPA to log the | |
2136 | * error and generate a logical data ereport. | |
2137 | */ | |
2138 | spa_log_error(spa, zio); | |
2139 | zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, zio, | |
2140 | 0, 0); | |
2141 | } | |
2142 | } | |
34dc7c2f | 2143 | |
b128c09f BB |
2144 | if (zio->io_error && zio == lio) { |
2145 | /* | |
2146 | * Determine whether zio should be reexecuted. This will | |
2147 | * propagate all the way to the root via zio_notify_parent(). | |
2148 | */ | |
2149 | ASSERT(vd == NULL && bp != NULL); | |
2150 | ||
2151 | if (IO_IS_ALLOCATING(zio)) | |
2152 | if (zio->io_error != ENOSPC) | |
2153 | zio->io_reexecute |= ZIO_REEXECUTE_NOW; | |
2154 | else | |
2155 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
2156 | ||
2157 | if ((zio->io_type == ZIO_TYPE_READ || | |
2158 | zio->io_type == ZIO_TYPE_FREE) && | |
2159 | zio->io_error == ENXIO && | |
2160 | spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) | |
2161 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
2162 | ||
2163 | if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) | |
2164 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
34dc7c2f BB |
2165 | } |
2166 | ||
2167 | /* | |
b128c09f BB |
2168 | * If there were logical child errors, they apply to us now. |
2169 | * We defer this until now to avoid conflating logical child | |
2170 | * errors with errors that happened to the zio itself when | |
2171 | * updating vdev stats and reporting FMA events above. | |
34dc7c2f | 2172 | */ |
b128c09f | 2173 | zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); |
34dc7c2f | 2174 | |
b128c09f BB |
2175 | if (zio->io_reexecute) { |
2176 | /* | |
2177 | * This is a logical I/O that wants to reexecute. | |
2178 | * | |
2179 | * Reexecute is top-down. When an i/o fails, if it's not | |
2180 | * the root, it simply notifies its parent and sticks around. | |
2181 | * The parent, seeing that it still has children in zio_done(), | |
2182 | * does the same. This percolates all the way up to the root. | |
2183 | * The root i/o will reexecute or suspend the entire tree. | |
2184 | * | |
2185 | * This approach ensures that zio_reexecute() honors | |
2186 | * all the original i/o dependency relationships, e.g. | |
2187 | * parents not executing until children are ready. | |
2188 | */ | |
2189 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
34dc7c2f | 2190 | |
b128c09f BB |
2191 | if (IO_IS_ALLOCATING(zio)) |
2192 | zio_dva_unallocate(zio, zio->io_gang_tree, bp); | |
2193 | ||
2194 | zio_gang_tree_free(&zio->io_gang_tree); | |
2195 | ||
2196 | if (pio != NULL) { | |
2197 | /* | |
2198 | * We're not a root i/o, so there's nothing to do | |
2199 | * but notify our parent. Don't propagate errors | |
2200 | * upward since we haven't permanently failed yet. | |
2201 | */ | |
2202 | zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; | |
2203 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); | |
2204 | } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { | |
2205 | /* | |
2206 | * We'd fail again if we reexecuted now, so suspend | |
2207 | * until conditions improve (e.g. device comes online). | |
2208 | */ | |
2209 | zio_suspend(spa, zio); | |
2210 | } else { | |
2211 | /* | |
2212 | * Reexecution is potentially a huge amount of work. | |
2213 | * Hand it off to the otherwise-unused claim taskq. | |
2214 | */ | |
2215 | (void) taskq_dispatch( | |
2216 | spa->spa_zio_taskq[ZIO_TYPE_CLAIM][ZIO_TASKQ_ISSUE], | |
2217 | (task_func_t *)zio_reexecute, zio, TQ_SLEEP); | |
2218 | } | |
2219 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
2220 | } |
2221 | ||
b128c09f BB |
2222 | ASSERT(zio->io_child == NULL); |
2223 | ASSERT(zio->io_reexecute == 0); | |
2224 | ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); | |
34dc7c2f | 2225 | |
b128c09f BB |
2226 | if (zio->io_done) |
2227 | zio->io_done(zio); | |
34dc7c2f | 2228 | |
b128c09f BB |
2229 | zio_gang_tree_free(&zio->io_gang_tree); |
2230 | ||
2231 | ASSERT(zio->io_delegate_list == NULL); | |
2232 | ASSERT(zio->io_delegate_next == NULL); | |
34dc7c2f | 2233 | |
b128c09f BB |
2234 | if (pio != NULL) { |
2235 | zio_remove_child(pio, zio); | |
2236 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); | |
2237 | } | |
34dc7c2f | 2238 | |
b128c09f BB |
2239 | if (zio->io_waiter != NULL) { |
2240 | mutex_enter(&zio->io_lock); | |
2241 | zio->io_executor = NULL; | |
2242 | cv_broadcast(&zio->io_cv); | |
2243 | mutex_exit(&zio->io_lock); | |
2244 | } else { | |
2245 | zio_destroy(zio); | |
2246 | } | |
34dc7c2f | 2247 | |
b128c09f | 2248 | return (ZIO_PIPELINE_STOP); |
34dc7c2f BB |
2249 | } |
2250 | ||
2251 | /* | |
b128c09f BB |
2252 | * ========================================================================== |
2253 | * I/O pipeline definition | |
2254 | * ========================================================================== | |
34dc7c2f | 2255 | */ |
b128c09f BB |
2256 | static zio_pipe_stage_t *zio_pipeline[ZIO_STAGES] = { |
2257 | NULL, | |
2258 | zio_issue_async, | |
2259 | zio_read_bp_init, | |
2260 | zio_write_bp_init, | |
2261 | zio_checksum_generate, | |
2262 | zio_gang_assemble, | |
2263 | zio_gang_issue, | |
2264 | zio_dva_allocate, | |
2265 | zio_dva_free, | |
2266 | zio_dva_claim, | |
2267 | zio_ready, | |
2268 | zio_vdev_io_start, | |
2269 | zio_vdev_io_done, | |
2270 | zio_vdev_io_assess, | |
2271 | zio_checksum_verify, | |
2272 | zio_done | |
2273 | }; |