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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. |
ebf8e3a2 | 23 | * Copyright (c) 2012 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> | |
34dc7c2f BB |
39 | |
40 | /* | |
41 | * ========================================================================== | |
42 | * I/O priority table | |
43 | * ========================================================================== | |
44 | */ | |
45 | uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE] = { | |
46 | 0, /* ZIO_PRIORITY_NOW */ | |
47 | 0, /* ZIO_PRIORITY_SYNC_READ */ | |
48 | 0, /* ZIO_PRIORITY_SYNC_WRITE */ | |
34dc7c2f | 49 | 0, /* ZIO_PRIORITY_LOG_WRITE */ |
428870ff BB |
50 | 1, /* ZIO_PRIORITY_CACHE_FILL */ |
51 | 1, /* ZIO_PRIORITY_AGG */ | |
52 | 4, /* ZIO_PRIORITY_FREE */ | |
53 | 4, /* ZIO_PRIORITY_ASYNC_WRITE */ | |
54 | 6, /* ZIO_PRIORITY_ASYNC_READ */ | |
34dc7c2f BB |
55 | 10, /* ZIO_PRIORITY_RESILVER */ |
56 | 20, /* ZIO_PRIORITY_SCRUB */ | |
428870ff | 57 | 2, /* ZIO_PRIORITY_DDT_PREFETCH */ |
34dc7c2f BB |
58 | }; |
59 | ||
60 | /* | |
61 | * ========================================================================== | |
62 | * I/O type descriptions | |
63 | * ========================================================================== | |
64 | */ | |
65 | char *zio_type_name[ZIO_TYPES] = { | |
451041db | 66 | "z_null", "z_rd", "z_wr", "z_fr", "z_cl", "z_ioctl" |
428870ff | 67 | }; |
34dc7c2f BB |
68 | |
69 | /* | |
70 | * ========================================================================== | |
71 | * I/O kmem caches | |
72 | * ========================================================================== | |
73 | */ | |
74 | kmem_cache_t *zio_cache; | |
d164b209 | 75 | kmem_cache_t *zio_link_cache; |
86dd0fd9 | 76 | kmem_cache_t *zio_vdev_cache; |
34dc7c2f BB |
77 | kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; |
78 | kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; | |
c28b2279 | 79 | int zio_bulk_flags = 0; |
a69052be | 80 | int zio_delay_max = ZIO_DELAY_MAX; |
34dc7c2f BB |
81 | |
82 | #ifdef _KERNEL | |
83 | extern vmem_t *zio_alloc_arena; | |
84 | #endif | |
6d974228 | 85 | extern int zfs_mg_alloc_failures; |
34dc7c2f | 86 | |
55d85d5a GW |
87 | /* |
88 | * The following actions directly effect the spa's sync-to-convergence logic. | |
89 | * The values below define the sync pass when we start performing the action. | |
90 | * Care should be taken when changing these values as they directly impact | |
91 | * spa_sync() performance. Tuning these values may introduce subtle performance | |
92 | * pathologies and should only be done in the context of performance analysis. | |
93 | * These tunables will eventually be removed and replaced with #defines once | |
94 | * enough analysis has been done to determine optimal values. | |
95 | * | |
96 | * The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that | |
97 | * regular blocks are not deferred. | |
98 | */ | |
99 | int zfs_sync_pass_deferred_free = 2; /* defer frees starting in this pass */ | |
100 | int zfs_sync_pass_dont_compress = 5; /* don't compress starting in this pass */ | |
101 | int zfs_sync_pass_rewrite = 2; /* rewrite new bps starting in this pass */ | |
102 | ||
34dc7c2f | 103 | /* |
b128c09f BB |
104 | * An allocating zio is one that either currently has the DVA allocate |
105 | * stage set or will have it later in its lifetime. | |
34dc7c2f | 106 | */ |
428870ff BB |
107 | #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) |
108 | ||
c409e464 | 109 | int zio_requeue_io_start_cut_in_line = 1; |
428870ff BB |
110 | |
111 | #ifdef ZFS_DEBUG | |
112 | int zio_buf_debug_limit = 16384; | |
113 | #else | |
114 | int zio_buf_debug_limit = 0; | |
115 | #endif | |
34dc7c2f | 116 | |
da6b4005 NB |
117 | static inline void __zio_execute(zio_t *zio); |
118 | ||
49be0ccf BB |
119 | static int |
120 | zio_cons(void *arg, void *unused, int kmflag) | |
121 | { | |
122 | zio_t *zio = arg; | |
123 | ||
124 | bzero(zio, sizeof (zio_t)); | |
125 | ||
126 | mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); | |
127 | cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); | |
128 | ||
129 | list_create(&zio->io_parent_list, sizeof (zio_link_t), | |
130 | offsetof(zio_link_t, zl_parent_node)); | |
131 | list_create(&zio->io_child_list, sizeof (zio_link_t), | |
132 | offsetof(zio_link_t, zl_child_node)); | |
133 | ||
134 | return (0); | |
135 | } | |
136 | ||
137 | static void | |
138 | zio_dest(void *arg, void *unused) | |
139 | { | |
140 | zio_t *zio = arg; | |
141 | ||
142 | mutex_destroy(&zio->io_lock); | |
143 | cv_destroy(&zio->io_cv); | |
144 | list_destroy(&zio->io_parent_list); | |
145 | list_destroy(&zio->io_child_list); | |
146 | } | |
147 | ||
34dc7c2f BB |
148 | void |
149 | zio_init(void) | |
150 | { | |
151 | size_t c; | |
152 | vmem_t *data_alloc_arena = NULL; | |
153 | ||
154 | #ifdef _KERNEL | |
155 | data_alloc_arena = zio_alloc_arena; | |
156 | #endif | |
49be0ccf BB |
157 | zio_cache = kmem_cache_create("zio_cache", sizeof (zio_t), 0, |
158 | zio_cons, zio_dest, NULL, NULL, NULL, KMC_KMEM); | |
d164b209 | 159 | zio_link_cache = kmem_cache_create("zio_link_cache", |
ae6ba3db | 160 | sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, KMC_KMEM); |
86dd0fd9 BB |
161 | zio_vdev_cache = kmem_cache_create("zio_vdev_cache", sizeof(vdev_io_t), |
162 | PAGESIZE, NULL, NULL, NULL, NULL, NULL, KMC_VMEM); | |
34dc7c2f BB |
163 | |
164 | /* | |
165 | * For small buffers, we want a cache for each multiple of | |
166 | * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache | |
167 | * for each quarter-power of 2. For large buffers, we want | |
168 | * a cache for each multiple of PAGESIZE. | |
169 | */ | |
170 | for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { | |
171 | size_t size = (c + 1) << SPA_MINBLOCKSHIFT; | |
172 | size_t p2 = size; | |
173 | size_t align = 0; | |
174 | ||
175 | while (p2 & (p2 - 1)) | |
176 | p2 &= p2 - 1; | |
177 | ||
178 | if (size <= 4 * SPA_MINBLOCKSIZE) { | |
179 | align = SPA_MINBLOCKSIZE; | |
180 | } else if (P2PHASE(size, PAGESIZE) == 0) { | |
181 | align = PAGESIZE; | |
182 | } else if (P2PHASE(size, p2 >> 2) == 0) { | |
183 | align = p2 >> 2; | |
184 | } | |
185 | ||
186 | if (align != 0) { | |
187 | char name[36]; | |
ae6ba3db BB |
188 | int flags = zio_bulk_flags; |
189 | ||
190 | /* | |
191 | * The smallest buffers (512b) are heavily used and | |
192 | * experience a lot of churn. The slabs allocated | |
193 | * for them are also relatively small (32K). Thus | |
194 | * in over to avoid expensive calls to vmalloc() we | |
195 | * make an exception to the usual slab allocation | |
196 | * policy and force these buffers to be kmem backed. | |
197 | */ | |
198 | if (size == (1 << SPA_MINBLOCKSHIFT)) | |
199 | flags |= KMC_KMEM; | |
200 | ||
34dc7c2f BB |
201 | (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); |
202 | zio_buf_cache[c] = kmem_cache_create(name, size, | |
ae6ba3db | 203 | align, NULL, NULL, NULL, NULL, NULL, flags); |
34dc7c2f BB |
204 | |
205 | (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); | |
206 | zio_data_buf_cache[c] = kmem_cache_create(name, size, | |
ae6ba3db BB |
207 | align, NULL, NULL, NULL, NULL, |
208 | data_alloc_arena, flags); | |
34dc7c2f BB |
209 | } |
210 | } | |
211 | ||
212 | while (--c != 0) { | |
213 | ASSERT(zio_buf_cache[c] != NULL); | |
214 | if (zio_buf_cache[c - 1] == NULL) | |
215 | zio_buf_cache[c - 1] = zio_buf_cache[c]; | |
216 | ||
217 | ASSERT(zio_data_buf_cache[c] != NULL); | |
218 | if (zio_data_buf_cache[c - 1] == NULL) | |
219 | zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; | |
220 | } | |
221 | ||
6d974228 GW |
222 | /* |
223 | * The zio write taskqs have 1 thread per cpu, allow 1/2 of the taskqs | |
224 | * to fail 3 times per txg or 8 failures, whichever is greater. | |
225 | */ | |
226 | zfs_mg_alloc_failures = MAX((3 * max_ncpus / 2), 8); | |
227 | ||
34dc7c2f | 228 | zio_inject_init(); |
9759c60f ED |
229 | |
230 | lz4_init(); | |
34dc7c2f BB |
231 | } |
232 | ||
233 | void | |
234 | zio_fini(void) | |
235 | { | |
236 | size_t c; | |
237 | kmem_cache_t *last_cache = NULL; | |
238 | kmem_cache_t *last_data_cache = NULL; | |
239 | ||
240 | for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { | |
241 | if (zio_buf_cache[c] != last_cache) { | |
242 | last_cache = zio_buf_cache[c]; | |
243 | kmem_cache_destroy(zio_buf_cache[c]); | |
244 | } | |
245 | zio_buf_cache[c] = NULL; | |
246 | ||
247 | if (zio_data_buf_cache[c] != last_data_cache) { | |
248 | last_data_cache = zio_data_buf_cache[c]; | |
249 | kmem_cache_destroy(zio_data_buf_cache[c]); | |
250 | } | |
251 | zio_data_buf_cache[c] = NULL; | |
252 | } | |
253 | ||
86dd0fd9 | 254 | kmem_cache_destroy(zio_vdev_cache); |
d164b209 | 255 | kmem_cache_destroy(zio_link_cache); |
34dc7c2f BB |
256 | kmem_cache_destroy(zio_cache); |
257 | ||
258 | zio_inject_fini(); | |
9759c60f ED |
259 | |
260 | lz4_fini(); | |
34dc7c2f BB |
261 | } |
262 | ||
263 | /* | |
264 | * ========================================================================== | |
265 | * Allocate and free I/O buffers | |
266 | * ========================================================================== | |
267 | */ | |
268 | ||
269 | /* | |
270 | * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a | |
271 | * crashdump if the kernel panics, so use it judiciously. Obviously, it's | |
272 | * useful to inspect ZFS metadata, but if possible, we should avoid keeping | |
273 | * excess / transient data in-core during a crashdump. | |
274 | */ | |
275 | void * | |
276 | zio_buf_alloc(size_t size) | |
277 | { | |
278 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
279 | ||
280 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
281 | ||
ebcfc8a5 | 282 | return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE | KM_NODEBUG)); |
34dc7c2f BB |
283 | } |
284 | ||
285 | /* | |
286 | * Use zio_data_buf_alloc to allocate data. The data will not appear in a | |
287 | * crashdump if the kernel panics. This exists so that we will limit the amount | |
288 | * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount | |
289 | * of kernel heap dumped to disk when the kernel panics) | |
290 | */ | |
291 | void * | |
292 | zio_data_buf_alloc(size_t size) | |
293 | { | |
294 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
295 | ||
296 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
297 | ||
ebcfc8a5 BB |
298 | return (kmem_cache_alloc(zio_data_buf_cache[c], |
299 | KM_PUSHPAGE | KM_NODEBUG)); | |
34dc7c2f BB |
300 | } |
301 | ||
302 | void | |
303 | zio_buf_free(void *buf, size_t size) | |
304 | { | |
305 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
306 | ||
307 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
308 | ||
309 | kmem_cache_free(zio_buf_cache[c], buf); | |
310 | } | |
311 | ||
312 | void | |
313 | zio_data_buf_free(void *buf, size_t size) | |
314 | { | |
315 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
316 | ||
317 | ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); | |
318 | ||
319 | kmem_cache_free(zio_data_buf_cache[c], buf); | |
320 | } | |
321 | ||
86dd0fd9 BB |
322 | /* |
323 | * Dedicated I/O buffers to ensure that memory fragmentation never prevents | |
324 | * or significantly delays the issuing of a zio. These buffers are used | |
325 | * to aggregate I/O and could be used for raidz stripes. | |
326 | */ | |
327 | void * | |
328 | zio_vdev_alloc(void) | |
329 | { | |
330 | return (kmem_cache_alloc(zio_vdev_cache, KM_PUSHPAGE)); | |
331 | } | |
332 | ||
333 | void | |
334 | zio_vdev_free(void *buf) | |
335 | { | |
336 | kmem_cache_free(zio_vdev_cache, buf); | |
337 | ||
338 | } | |
339 | ||
34dc7c2f BB |
340 | /* |
341 | * ========================================================================== | |
342 | * Push and pop I/O transform buffers | |
343 | * ========================================================================== | |
344 | */ | |
345 | static void | |
b128c09f BB |
346 | zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, |
347 | zio_transform_func_t *transform) | |
34dc7c2f | 348 | { |
691f6ac4 | 349 | zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_PUSHPAGE); |
34dc7c2f | 350 | |
b128c09f BB |
351 | zt->zt_orig_data = zio->io_data; |
352 | zt->zt_orig_size = zio->io_size; | |
34dc7c2f | 353 | zt->zt_bufsize = bufsize; |
b128c09f | 354 | zt->zt_transform = transform; |
34dc7c2f BB |
355 | |
356 | zt->zt_next = zio->io_transform_stack; | |
357 | zio->io_transform_stack = zt; | |
358 | ||
359 | zio->io_data = data; | |
360 | zio->io_size = size; | |
361 | } | |
362 | ||
363 | static void | |
b128c09f | 364 | zio_pop_transforms(zio_t *zio) |
34dc7c2f | 365 | { |
b128c09f BB |
366 | zio_transform_t *zt; |
367 | ||
368 | while ((zt = zio->io_transform_stack) != NULL) { | |
369 | if (zt->zt_transform != NULL) | |
370 | zt->zt_transform(zio, | |
371 | zt->zt_orig_data, zt->zt_orig_size); | |
34dc7c2f | 372 | |
428870ff BB |
373 | if (zt->zt_bufsize != 0) |
374 | zio_buf_free(zio->io_data, zt->zt_bufsize); | |
34dc7c2f | 375 | |
b128c09f BB |
376 | zio->io_data = zt->zt_orig_data; |
377 | zio->io_size = zt->zt_orig_size; | |
378 | zio->io_transform_stack = zt->zt_next; | |
34dc7c2f | 379 | |
b128c09f | 380 | kmem_free(zt, sizeof (zio_transform_t)); |
34dc7c2f BB |
381 | } |
382 | } | |
383 | ||
b128c09f BB |
384 | /* |
385 | * ========================================================================== | |
386 | * I/O transform callbacks for subblocks and decompression | |
387 | * ========================================================================== | |
388 | */ | |
389 | static void | |
390 | zio_subblock(zio_t *zio, void *data, uint64_t size) | |
391 | { | |
392 | ASSERT(zio->io_size > size); | |
393 | ||
394 | if (zio->io_type == ZIO_TYPE_READ) | |
395 | bcopy(zio->io_data, data, size); | |
396 | } | |
397 | ||
398 | static void | |
399 | zio_decompress(zio_t *zio, void *data, uint64_t size) | |
400 | { | |
401 | if (zio->io_error == 0 && | |
402 | zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), | |
428870ff | 403 | zio->io_data, data, zio->io_size, size) != 0) |
b128c09f BB |
404 | zio->io_error = EIO; |
405 | } | |
406 | ||
407 | /* | |
408 | * ========================================================================== | |
409 | * I/O parent/child relationships and pipeline interlocks | |
410 | * ========================================================================== | |
411 | */ | |
d164b209 BB |
412 | /* |
413 | * NOTE - Callers to zio_walk_parents() and zio_walk_children must | |
414 | * continue calling these functions until they return NULL. | |
415 | * Otherwise, the next caller will pick up the list walk in | |
416 | * some indeterminate state. (Otherwise every caller would | |
417 | * have to pass in a cookie to keep the state represented by | |
418 | * io_walk_link, which gets annoying.) | |
419 | */ | |
420 | zio_t * | |
421 | zio_walk_parents(zio_t *cio) | |
422 | { | |
423 | zio_link_t *zl = cio->io_walk_link; | |
424 | list_t *pl = &cio->io_parent_list; | |
b128c09f | 425 | |
d164b209 BB |
426 | zl = (zl == NULL) ? list_head(pl) : list_next(pl, zl); |
427 | cio->io_walk_link = zl; | |
428 | ||
429 | if (zl == NULL) | |
430 | return (NULL); | |
431 | ||
432 | ASSERT(zl->zl_child == cio); | |
433 | return (zl->zl_parent); | |
434 | } | |
435 | ||
436 | zio_t * | |
437 | zio_walk_children(zio_t *pio) | |
438 | { | |
439 | zio_link_t *zl = pio->io_walk_link; | |
440 | list_t *cl = &pio->io_child_list; | |
441 | ||
442 | zl = (zl == NULL) ? list_head(cl) : list_next(cl, zl); | |
443 | pio->io_walk_link = zl; | |
444 | ||
445 | if (zl == NULL) | |
446 | return (NULL); | |
447 | ||
448 | ASSERT(zl->zl_parent == pio); | |
449 | return (zl->zl_child); | |
450 | } | |
451 | ||
452 | zio_t * | |
453 | zio_unique_parent(zio_t *cio) | |
454 | { | |
455 | zio_t *pio = zio_walk_parents(cio); | |
456 | ||
457 | VERIFY(zio_walk_parents(cio) == NULL); | |
458 | return (pio); | |
459 | } | |
460 | ||
461 | void | |
462 | zio_add_child(zio_t *pio, zio_t *cio) | |
b128c09f | 463 | { |
691f6ac4 | 464 | zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_PUSHPAGE); |
d6320ddb | 465 | int w; |
d164b209 BB |
466 | |
467 | /* | |
468 | * Logical I/Os can have logical, gang, or vdev children. | |
469 | * Gang I/Os can have gang or vdev children. | |
470 | * Vdev I/Os can only have vdev children. | |
471 | * The following ASSERT captures all of these constraints. | |
472 | */ | |
473 | ASSERT(cio->io_child_type <= pio->io_child_type); | |
474 | ||
475 | zl->zl_parent = pio; | |
476 | zl->zl_child = cio; | |
477 | ||
478 | mutex_enter(&cio->io_lock); | |
b128c09f | 479 | mutex_enter(&pio->io_lock); |
d164b209 BB |
480 | |
481 | ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); | |
482 | ||
d6320ddb | 483 | for (w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 BB |
484 | pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; |
485 | ||
486 | list_insert_head(&pio->io_child_list, zl); | |
487 | list_insert_head(&cio->io_parent_list, zl); | |
488 | ||
428870ff BB |
489 | pio->io_child_count++; |
490 | cio->io_parent_count++; | |
491 | ||
b128c09f | 492 | mutex_exit(&pio->io_lock); |
d164b209 | 493 | mutex_exit(&cio->io_lock); |
b128c09f BB |
494 | } |
495 | ||
34dc7c2f | 496 | static void |
d164b209 | 497 | zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) |
b128c09f | 498 | { |
d164b209 BB |
499 | ASSERT(zl->zl_parent == pio); |
500 | ASSERT(zl->zl_child == cio); | |
b128c09f | 501 | |
d164b209 | 502 | mutex_enter(&cio->io_lock); |
b128c09f | 503 | mutex_enter(&pio->io_lock); |
d164b209 BB |
504 | |
505 | list_remove(&pio->io_child_list, zl); | |
506 | list_remove(&cio->io_parent_list, zl); | |
507 | ||
428870ff BB |
508 | pio->io_child_count--; |
509 | cio->io_parent_count--; | |
510 | ||
b128c09f | 511 | mutex_exit(&pio->io_lock); |
d164b209 BB |
512 | mutex_exit(&cio->io_lock); |
513 | ||
514 | kmem_cache_free(zio_link_cache, zl); | |
b128c09f BB |
515 | } |
516 | ||
517 | static boolean_t | |
518 | zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) | |
34dc7c2f | 519 | { |
b128c09f BB |
520 | uint64_t *countp = &zio->io_children[child][wait]; |
521 | boolean_t waiting = B_FALSE; | |
522 | ||
523 | mutex_enter(&zio->io_lock); | |
524 | ASSERT(zio->io_stall == NULL); | |
525 | if (*countp != 0) { | |
428870ff | 526 | zio->io_stage >>= 1; |
b128c09f BB |
527 | zio->io_stall = countp; |
528 | waiting = B_TRUE; | |
529 | } | |
530 | mutex_exit(&zio->io_lock); | |
531 | ||
532 | return (waiting); | |
533 | } | |
34dc7c2f | 534 | |
bf701a83 BB |
535 | __attribute__((always_inline)) |
536 | static inline void | |
b128c09f BB |
537 | zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) |
538 | { | |
539 | uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; | |
540 | int *errorp = &pio->io_child_error[zio->io_child_type]; | |
34dc7c2f | 541 | |
b128c09f BB |
542 | mutex_enter(&pio->io_lock); |
543 | if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) | |
544 | *errorp = zio_worst_error(*errorp, zio->io_error); | |
545 | pio->io_reexecute |= zio->io_reexecute; | |
546 | ASSERT3U(*countp, >, 0); | |
547 | if (--*countp == 0 && pio->io_stall == countp) { | |
548 | pio->io_stall = NULL; | |
549 | mutex_exit(&pio->io_lock); | |
da6b4005 | 550 | __zio_execute(pio); |
b128c09f BB |
551 | } else { |
552 | mutex_exit(&pio->io_lock); | |
34dc7c2f BB |
553 | } |
554 | } | |
555 | ||
b128c09f BB |
556 | static void |
557 | zio_inherit_child_errors(zio_t *zio, enum zio_child c) | |
558 | { | |
559 | if (zio->io_child_error[c] != 0 && zio->io_error == 0) | |
560 | zio->io_error = zio->io_child_error[c]; | |
561 | } | |
562 | ||
34dc7c2f BB |
563 | /* |
564 | * ========================================================================== | |
b128c09f | 565 | * Create the various types of I/O (read, write, free, etc) |
34dc7c2f BB |
566 | * ========================================================================== |
567 | */ | |
568 | static zio_t * | |
428870ff | 569 | zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
34dc7c2f | 570 | void *data, uint64_t size, zio_done_func_t *done, void *private, |
428870ff BB |
571 | zio_type_t type, int priority, enum zio_flag flags, |
572 | vdev_t *vd, uint64_t offset, const zbookmark_t *zb, | |
573 | enum zio_stage stage, enum zio_stage pipeline) | |
34dc7c2f BB |
574 | { |
575 | zio_t *zio; | |
576 | ||
577 | ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); | |
578 | ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); | |
b128c09f BB |
579 | ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); |
580 | ||
581 | ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); | |
582 | ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); | |
583 | ASSERT(vd || stage == ZIO_STAGE_OPEN); | |
34dc7c2f | 584 | |
691f6ac4 | 585 | zio = kmem_cache_alloc(zio_cache, KM_PUSHPAGE); |
d164b209 | 586 | |
b128c09f BB |
587 | if (vd != NULL) |
588 | zio->io_child_type = ZIO_CHILD_VDEV; | |
589 | else if (flags & ZIO_FLAG_GANG_CHILD) | |
590 | zio->io_child_type = ZIO_CHILD_GANG; | |
428870ff BB |
591 | else if (flags & ZIO_FLAG_DDT_CHILD) |
592 | zio->io_child_type = ZIO_CHILD_DDT; | |
b128c09f BB |
593 | else |
594 | zio->io_child_type = ZIO_CHILD_LOGICAL; | |
595 | ||
34dc7c2f | 596 | if (bp != NULL) { |
49be0ccf | 597 | zio->io_logical = NULL; |
428870ff | 598 | zio->io_bp = (blkptr_t *)bp; |
34dc7c2f BB |
599 | zio->io_bp_copy = *bp; |
600 | zio->io_bp_orig = *bp; | |
428870ff BB |
601 | if (type != ZIO_TYPE_WRITE || |
602 | zio->io_child_type == ZIO_CHILD_DDT) | |
b128c09f | 603 | zio->io_bp = &zio->io_bp_copy; /* so caller can free */ |
9babb374 | 604 | if (zio->io_child_type == ZIO_CHILD_LOGICAL) |
b128c09f | 605 | zio->io_logical = zio; |
9babb374 BB |
606 | if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) |
607 | pipeline |= ZIO_GANG_STAGES; | |
49be0ccf BB |
608 | } else { |
609 | zio->io_logical = NULL; | |
610 | zio->io_bp = NULL; | |
611 | bzero(&zio->io_bp_copy, sizeof (blkptr_t)); | |
612 | bzero(&zio->io_bp_orig, sizeof (blkptr_t)); | |
34dc7c2f | 613 | } |
b128c09f BB |
614 | |
615 | zio->io_spa = spa; | |
616 | zio->io_txg = txg; | |
49be0ccf | 617 | zio->io_ready = NULL; |
34dc7c2f BB |
618 | zio->io_done = done; |
619 | zio->io_private = private; | |
49be0ccf | 620 | zio->io_prev_space_delta = 0; |
34dc7c2f BB |
621 | zio->io_type = type; |
622 | zio->io_priority = priority; | |
b128c09f | 623 | zio->io_vd = vd; |
49be0ccf BB |
624 | zio->io_vsd = NULL; |
625 | zio->io_vsd_ops = NULL; | |
b128c09f | 626 | zio->io_offset = offset; |
49be0ccf | 627 | zio->io_deadline = 0; |
cc92e9d0 GW |
628 | zio->io_timestamp = 0; |
629 | zio->io_delta = 0; | |
630 | zio->io_delay = 0; | |
428870ff BB |
631 | zio->io_orig_data = zio->io_data = data; |
632 | zio->io_orig_size = zio->io_size = size; | |
b128c09f BB |
633 | zio->io_orig_flags = zio->io_flags = flags; |
634 | zio->io_orig_stage = zio->io_stage = stage; | |
635 | zio->io_orig_pipeline = zio->io_pipeline = pipeline; | |
49be0ccf BB |
636 | bzero(&zio->io_prop, sizeof (zio_prop_t)); |
637 | zio->io_cmd = 0; | |
638 | zio->io_reexecute = 0; | |
639 | zio->io_bp_override = NULL; | |
640 | zio->io_walk_link = NULL; | |
641 | zio->io_transform_stack = NULL; | |
49be0ccf BB |
642 | zio->io_error = 0; |
643 | zio->io_child_count = 0; | |
644 | zio->io_parent_count = 0; | |
645 | zio->io_stall = NULL; | |
646 | zio->io_gang_leader = NULL; | |
647 | zio->io_gang_tree = NULL; | |
648 | zio->io_executor = NULL; | |
649 | zio->io_waiter = NULL; | |
650 | zio->io_cksum_report = NULL; | |
651 | zio->io_ena = 0; | |
652 | bzero(zio->io_child_error, sizeof (int) * ZIO_CHILD_TYPES); | |
653 | bzero(zio->io_children, | |
654 | sizeof (uint64_t) * ZIO_CHILD_TYPES * ZIO_WAIT_TYPES); | |
655 | bzero(&zio->io_bookmark, sizeof (zbookmark_t)); | |
34dc7c2f | 656 | |
d164b209 BB |
657 | zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); |
658 | zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); | |
659 | ||
b128c09f BB |
660 | if (zb != NULL) |
661 | zio->io_bookmark = *zb; | |
662 | ||
663 | if (pio != NULL) { | |
b128c09f | 664 | if (zio->io_logical == NULL) |
34dc7c2f | 665 | zio->io_logical = pio->io_logical; |
9babb374 BB |
666 | if (zio->io_child_type == ZIO_CHILD_GANG) |
667 | zio->io_gang_leader = pio->io_gang_leader; | |
b128c09f | 668 | zio_add_child(pio, zio); |
34dc7c2f BB |
669 | } |
670 | ||
a38718a6 GA |
671 | taskq_init_ent(&zio->io_tqent); |
672 | ||
34dc7c2f BB |
673 | return (zio); |
674 | } | |
675 | ||
676 | static void | |
b128c09f | 677 | zio_destroy(zio_t *zio) |
34dc7c2f | 678 | { |
b128c09f | 679 | kmem_cache_free(zio_cache, zio); |
34dc7c2f BB |
680 | } |
681 | ||
682 | zio_t * | |
d164b209 | 683 | zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, |
428870ff | 684 | void *private, enum zio_flag flags) |
34dc7c2f BB |
685 | { |
686 | zio_t *zio; | |
687 | ||
688 | zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, | |
d164b209 | 689 | ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, |
b128c09f | 690 | ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); |
34dc7c2f BB |
691 | |
692 | return (zio); | |
693 | } | |
694 | ||
695 | zio_t * | |
428870ff | 696 | zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) |
34dc7c2f | 697 | { |
d164b209 | 698 | return (zio_null(NULL, spa, NULL, done, private, flags)); |
34dc7c2f BB |
699 | } |
700 | ||
701 | zio_t * | |
b128c09f BB |
702 | zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, |
703 | void *data, uint64_t size, zio_done_func_t *done, void *private, | |
428870ff | 704 | int priority, enum zio_flag flags, const zbookmark_t *zb) |
34dc7c2f BB |
705 | { |
706 | zio_t *zio; | |
707 | ||
428870ff | 708 | zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, |
b128c09f BB |
709 | data, size, done, private, |
710 | ZIO_TYPE_READ, priority, flags, NULL, 0, zb, | |
428870ff BB |
711 | ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? |
712 | ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); | |
34dc7c2f | 713 | |
b128c09f BB |
714 | return (zio); |
715 | } | |
34dc7c2f | 716 | |
34dc7c2f | 717 | zio_t * |
b128c09f | 718 | zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, |
428870ff | 719 | void *data, uint64_t size, const zio_prop_t *zp, |
b128c09f | 720 | zio_done_func_t *ready, zio_done_func_t *done, void *private, |
428870ff | 721 | int priority, enum zio_flag flags, const zbookmark_t *zb) |
34dc7c2f BB |
722 | { |
723 | zio_t *zio; | |
724 | ||
b128c09f BB |
725 | ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && |
726 | zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && | |
727 | zp->zp_compress >= ZIO_COMPRESS_OFF && | |
728 | zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && | |
9ae529ec | 729 | DMU_OT_IS_VALID(zp->zp_type) && |
b128c09f | 730 | zp->zp_level < 32 && |
428870ff BB |
731 | zp->zp_copies > 0 && |
732 | zp->zp_copies <= spa_max_replication(spa) && | |
733 | zp->zp_dedup <= 1 && | |
734 | zp->zp_dedup_verify <= 1); | |
34dc7c2f BB |
735 | |
736 | zio = zio_create(pio, spa, txg, bp, data, size, done, private, | |
b128c09f | 737 | ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, |
428870ff BB |
738 | ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? |
739 | ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); | |
34dc7c2f BB |
740 | |
741 | zio->io_ready = ready; | |
b128c09f | 742 | zio->io_prop = *zp; |
34dc7c2f BB |
743 | |
744 | return (zio); | |
745 | } | |
746 | ||
747 | zio_t * | |
b128c09f BB |
748 | zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, |
749 | uint64_t size, zio_done_func_t *done, void *private, int priority, | |
428870ff | 750 | enum zio_flag flags, zbookmark_t *zb) |
34dc7c2f BB |
751 | { |
752 | zio_t *zio; | |
753 | ||
34dc7c2f | 754 | zio = zio_create(pio, spa, txg, bp, data, size, done, private, |
b128c09f BB |
755 | ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, |
756 | ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); | |
34dc7c2f BB |
757 | |
758 | return (zio); | |
759 | } | |
760 | ||
428870ff BB |
761 | void |
762 | zio_write_override(zio_t *zio, blkptr_t *bp, int copies) | |
763 | { | |
764 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); | |
765 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
766 | ASSERT(zio->io_stage == ZIO_STAGE_OPEN); | |
767 | ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); | |
768 | ||
769 | zio->io_prop.zp_copies = copies; | |
770 | zio->io_bp_override = bp; | |
771 | } | |
772 | ||
773 | void | |
774 | zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) | |
775 | { | |
776 | bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp); | |
777 | } | |
778 | ||
34dc7c2f | 779 | zio_t * |
428870ff BB |
780 | zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
781 | enum zio_flag flags) | |
34dc7c2f BB |
782 | { |
783 | zio_t *zio; | |
784 | ||
428870ff BB |
785 | dprintf_bp(bp, "freeing in txg %llu, pass %u", |
786 | (longlong_t)txg, spa->spa_sync_pass); | |
34dc7c2f | 787 | |
428870ff BB |
788 | ASSERT(!BP_IS_HOLE(bp)); |
789 | ASSERT(spa_syncing_txg(spa) == txg); | |
55d85d5a | 790 | ASSERT(spa_sync_pass(spa) < zfs_sync_pass_deferred_free); |
34dc7c2f | 791 | |
b128c09f | 792 | zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), |
428870ff | 793 | NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, flags, |
b128c09f | 794 | NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_FREE_PIPELINE); |
34dc7c2f BB |
795 | |
796 | return (zio); | |
797 | } | |
798 | ||
799 | zio_t * | |
428870ff BB |
800 | zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
801 | zio_done_func_t *done, void *private, enum zio_flag flags) | |
34dc7c2f BB |
802 | { |
803 | zio_t *zio; | |
804 | ||
805 | /* | |
806 | * A claim is an allocation of a specific block. Claims are needed | |
807 | * to support immediate writes in the intent log. The issue is that | |
808 | * immediate writes contain committed data, but in a txg that was | |
809 | * *not* committed. Upon opening the pool after an unclean shutdown, | |
810 | * the intent log claims all blocks that contain immediate write data | |
811 | * so that the SPA knows they're in use. | |
812 | * | |
813 | * All claims *must* be resolved in the first txg -- before the SPA | |
814 | * starts allocating blocks -- so that nothing is allocated twice. | |
428870ff | 815 | * If txg == 0 we just verify that the block is claimable. |
34dc7c2f BB |
816 | */ |
817 | ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); | |
428870ff BB |
818 | ASSERT(txg == spa_first_txg(spa) || txg == 0); |
819 | ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ | |
34dc7c2f | 820 | |
b128c09f BB |
821 | zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), |
822 | done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, | |
823 | NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); | |
34dc7c2f BB |
824 | |
825 | return (zio); | |
826 | } | |
827 | ||
828 | zio_t * | |
829 | zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, | |
428870ff | 830 | zio_done_func_t *done, void *private, int priority, enum zio_flag flags) |
34dc7c2f BB |
831 | { |
832 | zio_t *zio; | |
833 | int c; | |
834 | ||
835 | if (vd->vdev_children == 0) { | |
836 | zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, | |
b128c09f | 837 | ZIO_TYPE_IOCTL, priority, flags, vd, 0, NULL, |
34dc7c2f BB |
838 | ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); |
839 | ||
34dc7c2f BB |
840 | zio->io_cmd = cmd; |
841 | } else { | |
d164b209 | 842 | zio = zio_null(pio, spa, NULL, NULL, NULL, flags); |
34dc7c2f BB |
843 | |
844 | for (c = 0; c < vd->vdev_children; c++) | |
845 | zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, | |
846 | done, private, priority, flags)); | |
847 | } | |
848 | ||
849 | return (zio); | |
850 | } | |
851 | ||
34dc7c2f BB |
852 | zio_t * |
853 | zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, | |
854 | void *data, int checksum, zio_done_func_t *done, void *private, | |
428870ff | 855 | int priority, enum zio_flag flags, boolean_t labels) |
34dc7c2f BB |
856 | { |
857 | zio_t *zio; | |
34dc7c2f | 858 | |
b128c09f BB |
859 | ASSERT(vd->vdev_children == 0); |
860 | ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || | |
861 | offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); | |
862 | ASSERT3U(offset + size, <=, vd->vdev_psize); | |
34dc7c2f | 863 | |
b128c09f BB |
864 | zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, |
865 | ZIO_TYPE_READ, priority, flags, vd, offset, NULL, | |
34dc7c2f BB |
866 | ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); |
867 | ||
b128c09f | 868 | zio->io_prop.zp_checksum = checksum; |
34dc7c2f BB |
869 | |
870 | return (zio); | |
871 | } | |
872 | ||
873 | zio_t * | |
874 | zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, | |
875 | void *data, int checksum, zio_done_func_t *done, void *private, | |
428870ff | 876 | int priority, enum zio_flag flags, boolean_t labels) |
34dc7c2f | 877 | { |
34dc7c2f | 878 | zio_t *zio; |
34dc7c2f | 879 | |
b128c09f BB |
880 | ASSERT(vd->vdev_children == 0); |
881 | ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || | |
882 | offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); | |
883 | ASSERT3U(offset + size, <=, vd->vdev_psize); | |
34dc7c2f | 884 | |
b128c09f BB |
885 | zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, |
886 | ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL, | |
34dc7c2f BB |
887 | ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); |
888 | ||
b128c09f | 889 | zio->io_prop.zp_checksum = checksum; |
34dc7c2f | 890 | |
428870ff | 891 | if (zio_checksum_table[checksum].ci_eck) { |
34dc7c2f | 892 | /* |
428870ff | 893 | * zec checksums are necessarily destructive -- they modify |
b128c09f | 894 | * the end of the write buffer to hold the verifier/checksum. |
34dc7c2f | 895 | * Therefore, we must make a local copy in case the data is |
b128c09f | 896 | * being written to multiple places in parallel. |
34dc7c2f | 897 | */ |
b128c09f | 898 | void *wbuf = zio_buf_alloc(size); |
34dc7c2f | 899 | bcopy(data, wbuf, size); |
b128c09f | 900 | zio_push_transform(zio, wbuf, size, size, NULL); |
34dc7c2f BB |
901 | } |
902 | ||
903 | return (zio); | |
904 | } | |
905 | ||
906 | /* | |
b128c09f | 907 | * Create a child I/O to do some work for us. |
34dc7c2f BB |
908 | */ |
909 | zio_t * | |
b128c09f | 910 | zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, |
428870ff | 911 | void *data, uint64_t size, int type, int priority, enum zio_flag flags, |
34dc7c2f BB |
912 | zio_done_func_t *done, void *private) |
913 | { | |
428870ff | 914 | enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; |
b128c09f BB |
915 | zio_t *zio; |
916 | ||
917 | ASSERT(vd->vdev_parent == | |
918 | (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); | |
34dc7c2f BB |
919 | |
920 | if (type == ZIO_TYPE_READ && bp != NULL) { | |
921 | /* | |
922 | * If we have the bp, then the child should perform the | |
923 | * checksum and the parent need not. This pushes error | |
924 | * detection as close to the leaves as possible and | |
925 | * eliminates redundant checksums in the interior nodes. | |
926 | */ | |
428870ff BB |
927 | pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; |
928 | pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; | |
34dc7c2f BB |
929 | } |
930 | ||
b128c09f BB |
931 | if (vd->vdev_children == 0) |
932 | offset += VDEV_LABEL_START_SIZE; | |
933 | ||
428870ff BB |
934 | flags |= ZIO_VDEV_CHILD_FLAGS(pio) | ZIO_FLAG_DONT_PROPAGATE; |
935 | ||
936 | /* | |
937 | * If we've decided to do a repair, the write is not speculative -- | |
938 | * even if the original read was. | |
939 | */ | |
940 | if (flags & ZIO_FLAG_IO_REPAIR) | |
941 | flags &= ~ZIO_FLAG_SPECULATIVE; | |
942 | ||
b128c09f | 943 | zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, |
428870ff BB |
944 | done, private, type, priority, flags, vd, offset, &pio->io_bookmark, |
945 | ZIO_STAGE_VDEV_IO_START >> 1, pipeline); | |
34dc7c2f | 946 | |
b128c09f | 947 | return (zio); |
34dc7c2f BB |
948 | } |
949 | ||
b128c09f BB |
950 | zio_t * |
951 | zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, | |
428870ff BB |
952 | int type, int priority, enum zio_flag flags, |
953 | zio_done_func_t *done, void *private) | |
34dc7c2f | 954 | { |
b128c09f | 955 | zio_t *zio; |
34dc7c2f | 956 | |
b128c09f | 957 | ASSERT(vd->vdev_ops->vdev_op_leaf); |
34dc7c2f | 958 | |
b128c09f BB |
959 | zio = zio_create(NULL, vd->vdev_spa, 0, NULL, |
960 | data, size, done, private, type, priority, | |
961 | flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY, | |
962 | vd, offset, NULL, | |
428870ff | 963 | ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); |
34dc7c2f | 964 | |
b128c09f | 965 | return (zio); |
34dc7c2f BB |
966 | } |
967 | ||
968 | void | |
b128c09f | 969 | zio_flush(zio_t *zio, vdev_t *vd) |
34dc7c2f | 970 | { |
b128c09f BB |
971 | zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, |
972 | NULL, NULL, ZIO_PRIORITY_NOW, | |
973 | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); | |
34dc7c2f BB |
974 | } |
975 | ||
428870ff BB |
976 | void |
977 | zio_shrink(zio_t *zio, uint64_t size) | |
978 | { | |
979 | ASSERT(zio->io_executor == NULL); | |
980 | ASSERT(zio->io_orig_size == zio->io_size); | |
981 | ASSERT(size <= zio->io_size); | |
982 | ||
983 | /* | |
984 | * We don't shrink for raidz because of problems with the | |
985 | * reconstruction when reading back less than the block size. | |
986 | * Note, BP_IS_RAIDZ() assumes no compression. | |
987 | */ | |
988 | ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); | |
989 | if (!BP_IS_RAIDZ(zio->io_bp)) | |
990 | zio->io_orig_size = zio->io_size = size; | |
991 | } | |
992 | ||
34dc7c2f BB |
993 | /* |
994 | * ========================================================================== | |
b128c09f | 995 | * Prepare to read and write logical blocks |
34dc7c2f BB |
996 | * ========================================================================== |
997 | */ | |
b128c09f | 998 | |
34dc7c2f | 999 | static int |
b128c09f | 1000 | zio_read_bp_init(zio_t *zio) |
34dc7c2f | 1001 | { |
b128c09f | 1002 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 1003 | |
fb5f0bc8 | 1004 | if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && |
9babb374 BB |
1005 | zio->io_child_type == ZIO_CHILD_LOGICAL && |
1006 | !(zio->io_flags & ZIO_FLAG_RAW)) { | |
428870ff BB |
1007 | uint64_t psize = BP_GET_PSIZE(bp); |
1008 | void *cbuf = zio_buf_alloc(psize); | |
b128c09f | 1009 | |
428870ff | 1010 | zio_push_transform(zio, cbuf, psize, psize, zio_decompress); |
34dc7c2f | 1011 | } |
34dc7c2f | 1012 | |
9ae529ec | 1013 | if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) && BP_GET_LEVEL(bp) == 0) |
b128c09f BB |
1014 | zio->io_flags |= ZIO_FLAG_DONT_CACHE; |
1015 | ||
428870ff BB |
1016 | if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) |
1017 | zio->io_flags |= ZIO_FLAG_DONT_CACHE; | |
1018 | ||
1019 | if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) | |
1020 | zio->io_pipeline = ZIO_DDT_READ_PIPELINE; | |
1021 | ||
b128c09f | 1022 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
1023 | } |
1024 | ||
b128c09f BB |
1025 | static int |
1026 | zio_write_bp_init(zio_t *zio) | |
34dc7c2f | 1027 | { |
428870ff | 1028 | spa_t *spa = zio->io_spa; |
b128c09f | 1029 | zio_prop_t *zp = &zio->io_prop; |
428870ff | 1030 | enum zio_compress compress = zp->zp_compress; |
34dc7c2f | 1031 | blkptr_t *bp = zio->io_bp; |
b128c09f | 1032 | uint64_t lsize = zio->io_size; |
428870ff | 1033 | uint64_t psize = lsize; |
b128c09f | 1034 | int pass = 1; |
34dc7c2f | 1035 | |
b128c09f BB |
1036 | /* |
1037 | * If our children haven't all reached the ready stage, | |
1038 | * wait for them and then repeat this pipeline stage. | |
1039 | */ | |
1040 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || | |
1041 | zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) | |
1042 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 1043 | |
b128c09f BB |
1044 | if (!IO_IS_ALLOCATING(zio)) |
1045 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f | 1046 | |
428870ff BB |
1047 | ASSERT(zio->io_child_type != ZIO_CHILD_DDT); |
1048 | ||
1049 | if (zio->io_bp_override) { | |
1050 | ASSERT(bp->blk_birth != zio->io_txg); | |
1051 | ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); | |
1052 | ||
1053 | *bp = *zio->io_bp_override; | |
1054 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
1055 | ||
1056 | if (BP_IS_HOLE(bp) || !zp->zp_dedup) | |
1057 | return (ZIO_PIPELINE_CONTINUE); | |
1058 | ||
1059 | ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup || | |
1060 | zp->zp_dedup_verify); | |
1061 | ||
1062 | if (BP_GET_CHECKSUM(bp) == zp->zp_checksum) { | |
1063 | BP_SET_DEDUP(bp, 1); | |
1064 | zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; | |
1065 | return (ZIO_PIPELINE_CONTINUE); | |
1066 | } | |
1067 | zio->io_bp_override = NULL; | |
1068 | BP_ZERO(bp); | |
1069 | } | |
34dc7c2f | 1070 | |
b128c09f BB |
1071 | if (bp->blk_birth == zio->io_txg) { |
1072 | /* | |
1073 | * We're rewriting an existing block, which means we're | |
1074 | * working on behalf of spa_sync(). For spa_sync() to | |
1075 | * converge, it must eventually be the case that we don't | |
1076 | * have to allocate new blocks. But compression changes | |
1077 | * the blocksize, which forces a reallocate, and makes | |
1078 | * convergence take longer. Therefore, after the first | |
1079 | * few passes, stop compressing to ensure convergence. | |
1080 | */ | |
428870ff BB |
1081 | pass = spa_sync_pass(spa); |
1082 | ||
1083 | ASSERT(zio->io_txg == spa_syncing_txg(spa)); | |
1084 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1085 | ASSERT(!BP_GET_DEDUP(bp)); | |
34dc7c2f | 1086 | |
55d85d5a | 1087 | if (pass >= zfs_sync_pass_dont_compress) |
b128c09f | 1088 | compress = ZIO_COMPRESS_OFF; |
34dc7c2f | 1089 | |
b128c09f | 1090 | /* Make sure someone doesn't change their mind on overwrites */ |
428870ff BB |
1091 | ASSERT(MIN(zp->zp_copies + BP_IS_GANG(bp), |
1092 | spa_max_replication(spa)) == BP_GET_NDVAS(bp)); | |
b128c09f | 1093 | } |
34dc7c2f | 1094 | |
b128c09f | 1095 | if (compress != ZIO_COMPRESS_OFF) { |
428870ff BB |
1096 | void *cbuf = zio_buf_alloc(lsize); |
1097 | psize = zio_compress_data(compress, zio->io_data, cbuf, lsize); | |
1098 | if (psize == 0 || psize == lsize) { | |
b128c09f | 1099 | compress = ZIO_COMPRESS_OFF; |
428870ff BB |
1100 | zio_buf_free(cbuf, lsize); |
1101 | } else { | |
1102 | ASSERT(psize < lsize); | |
1103 | zio_push_transform(zio, cbuf, psize, lsize, NULL); | |
b128c09f BB |
1104 | } |
1105 | } | |
34dc7c2f | 1106 | |
b128c09f BB |
1107 | /* |
1108 | * The final pass of spa_sync() must be all rewrites, but the first | |
1109 | * few passes offer a trade-off: allocating blocks defers convergence, | |
1110 | * but newly allocated blocks are sequential, so they can be written | |
1111 | * to disk faster. Therefore, we allow the first few passes of | |
1112 | * spa_sync() to allocate new blocks, but force rewrites after that. | |
1113 | * There should only be a handful of blocks after pass 1 in any case. | |
1114 | */ | |
428870ff | 1115 | if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == psize && |
55d85d5a | 1116 | pass >= zfs_sync_pass_rewrite) { |
428870ff | 1117 | enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; |
d6320ddb | 1118 | ASSERT(psize != 0); |
b128c09f BB |
1119 | zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; |
1120 | zio->io_flags |= ZIO_FLAG_IO_REWRITE; | |
1121 | } else { | |
1122 | BP_ZERO(bp); | |
1123 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
1124 | } | |
34dc7c2f | 1125 | |
428870ff | 1126 | if (psize == 0) { |
b128c09f BB |
1127 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
1128 | } else { | |
1129 | ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); | |
1130 | BP_SET_LSIZE(bp, lsize); | |
428870ff | 1131 | BP_SET_PSIZE(bp, psize); |
b128c09f BB |
1132 | BP_SET_COMPRESS(bp, compress); |
1133 | BP_SET_CHECKSUM(bp, zp->zp_checksum); | |
1134 | BP_SET_TYPE(bp, zp->zp_type); | |
1135 | BP_SET_LEVEL(bp, zp->zp_level); | |
428870ff | 1136 | BP_SET_DEDUP(bp, zp->zp_dedup); |
b128c09f | 1137 | BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); |
428870ff BB |
1138 | if (zp->zp_dedup) { |
1139 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1140 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); | |
1141 | zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | return (ZIO_PIPELINE_CONTINUE); | |
1146 | } | |
1147 | ||
1148 | static int | |
1149 | zio_free_bp_init(zio_t *zio) | |
1150 | { | |
1151 | blkptr_t *bp = zio->io_bp; | |
1152 | ||
1153 | if (zio->io_child_type == ZIO_CHILD_LOGICAL) { | |
1154 | if (BP_GET_DEDUP(bp)) | |
1155 | zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; | |
b128c09f | 1156 | } |
34dc7c2f BB |
1157 | |
1158 | return (ZIO_PIPELINE_CONTINUE); | |
1159 | } | |
1160 | ||
b128c09f BB |
1161 | /* |
1162 | * ========================================================================== | |
1163 | * Execute the I/O pipeline | |
1164 | * ========================================================================== | |
1165 | */ | |
1166 | ||
1167 | static void | |
7ef5e54e | 1168 | zio_taskq_dispatch(zio_t *zio, zio_taskq_type_t q, boolean_t cutinline) |
34dc7c2f | 1169 | { |
428870ff | 1170 | spa_t *spa = zio->io_spa; |
b128c09f | 1171 | zio_type_t t = zio->io_type; |
a38718a6 | 1172 | int flags = (cutinline ? TQ_FRONT : 0); |
34dc7c2f BB |
1173 | |
1174 | /* | |
9babb374 BB |
1175 | * If we're a config writer or a probe, the normal issue and |
1176 | * interrupt threads may all be blocked waiting for the config lock. | |
1177 | * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. | |
34dc7c2f | 1178 | */ |
9babb374 | 1179 | if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) |
b128c09f | 1180 | t = ZIO_TYPE_NULL; |
34dc7c2f BB |
1181 | |
1182 | /* | |
b128c09f | 1183 | * A similar issue exists for the L2ARC write thread until L2ARC 2.0. |
34dc7c2f | 1184 | */ |
b128c09f BB |
1185 | if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) |
1186 | t = ZIO_TYPE_NULL; | |
34dc7c2f | 1187 | |
428870ff | 1188 | /* |
7ef5e54e AL |
1189 | * If this is a high priority I/O, then use the high priority taskq if |
1190 | * available. | |
428870ff BB |
1191 | */ |
1192 | if (zio->io_priority == ZIO_PRIORITY_NOW && | |
7ef5e54e | 1193 | spa->spa_zio_taskq[t][q + 1].stqs_count != 0) |
428870ff BB |
1194 | q++; |
1195 | ||
1196 | ASSERT3U(q, <, ZIO_TASKQ_TYPES); | |
5cc556b4 | 1197 | |
a38718a6 GA |
1198 | /* |
1199 | * NB: We are assuming that the zio can only be dispatched | |
1200 | * to a single taskq at a time. It would be a grievous error | |
1201 | * to dispatch the zio to another taskq at the same time. | |
1202 | */ | |
1203 | ASSERT(taskq_empty_ent(&zio->io_tqent)); | |
7ef5e54e AL |
1204 | spa_taskq_dispatch_ent(spa, t, q, (task_func_t *)zio_execute, zio, |
1205 | flags, &zio->io_tqent); | |
b128c09f | 1206 | } |
34dc7c2f | 1207 | |
b128c09f | 1208 | static boolean_t |
7ef5e54e | 1209 | zio_taskq_member(zio_t *zio, zio_taskq_type_t q) |
b128c09f BB |
1210 | { |
1211 | kthread_t *executor = zio->io_executor; | |
1212 | spa_t *spa = zio->io_spa; | |
d6320ddb | 1213 | zio_type_t t; |
34dc7c2f | 1214 | |
7ef5e54e AL |
1215 | for (t = 0; t < ZIO_TYPES; t++) { |
1216 | spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; | |
1217 | uint_t i; | |
1218 | for (i = 0; i < tqs->stqs_count; i++) { | |
1219 | if (taskq_member(tqs->stqs_taskq[i], executor)) | |
1220 | return (B_TRUE); | |
1221 | } | |
1222 | } | |
34dc7c2f | 1223 | |
b128c09f BB |
1224 | return (B_FALSE); |
1225 | } | |
34dc7c2f | 1226 | |
b128c09f BB |
1227 | static int |
1228 | zio_issue_async(zio_t *zio) | |
1229 | { | |
428870ff | 1230 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); |
b128c09f BB |
1231 | |
1232 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
1233 | } |
1234 | ||
b128c09f BB |
1235 | void |
1236 | zio_interrupt(zio_t *zio) | |
34dc7c2f | 1237 | { |
428870ff | 1238 | zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE); |
b128c09f | 1239 | } |
34dc7c2f | 1240 | |
b128c09f BB |
1241 | /* |
1242 | * Execute the I/O pipeline until one of the following occurs: | |
1243 | * (1) the I/O completes; (2) the pipeline stalls waiting for | |
1244 | * dependent child I/Os; (3) the I/O issues, so we're waiting | |
1245 | * for an I/O completion interrupt; (4) the I/O is delegated by | |
1246 | * vdev-level caching or aggregation; (5) the I/O is deferred | |
1247 | * due to vdev-level queueing; (6) the I/O is handed off to | |
1248 | * another thread. In all cases, the pipeline stops whenever | |
1249 | * there's no CPU work; it never burns a thread in cv_wait(). | |
1250 | * | |
1251 | * There's no locking on io_stage because there's no legitimate way | |
1252 | * for multiple threads to be attempting to process the same I/O. | |
1253 | */ | |
428870ff | 1254 | static zio_pipe_stage_t *zio_pipeline[]; |
34dc7c2f | 1255 | |
da6b4005 NB |
1256 | /* |
1257 | * zio_execute() is a wrapper around the static function | |
1258 | * __zio_execute() so that we can force __zio_execute() to be | |
1259 | * inlined. This reduces stack overhead which is important | |
1260 | * because __zio_execute() is called recursively in several zio | |
1261 | * code paths. zio_execute() itself cannot be inlined because | |
1262 | * it is externally visible. | |
1263 | */ | |
b128c09f BB |
1264 | void |
1265 | zio_execute(zio_t *zio) | |
da6b4005 NB |
1266 | { |
1267 | __zio_execute(zio); | |
1268 | } | |
1269 | ||
1270 | __attribute__((always_inline)) | |
1271 | static inline void | |
1272 | __zio_execute(zio_t *zio) | |
b128c09f BB |
1273 | { |
1274 | zio->io_executor = curthread; | |
34dc7c2f | 1275 | |
b128c09f | 1276 | while (zio->io_stage < ZIO_STAGE_DONE) { |
428870ff BB |
1277 | enum zio_stage pipeline = zio->io_pipeline; |
1278 | enum zio_stage stage = zio->io_stage; | |
91579709 | 1279 | dsl_pool_t *dp; |
2fac4c2a | 1280 | boolean_t cut; |
b128c09f | 1281 | int rv; |
34dc7c2f | 1282 | |
b128c09f | 1283 | ASSERT(!MUTEX_HELD(&zio->io_lock)); |
428870ff BB |
1284 | ASSERT(ISP2(stage)); |
1285 | ASSERT(zio->io_stall == NULL); | |
34dc7c2f | 1286 | |
428870ff BB |
1287 | do { |
1288 | stage <<= 1; | |
1289 | } while ((stage & pipeline) == 0); | |
b128c09f BB |
1290 | |
1291 | ASSERT(stage <= ZIO_STAGE_DONE); | |
34dc7c2f | 1292 | |
91579709 | 1293 | dp = spa_get_dsl(zio->io_spa); |
2fac4c2a BB |
1294 | cut = (stage == ZIO_STAGE_VDEV_IO_START) ? |
1295 | zio_requeue_io_start_cut_in_line : B_FALSE; | |
1296 | ||
34dc7c2f | 1297 | /* |
b128c09f BB |
1298 | * If we are in interrupt context and this pipeline stage |
1299 | * will grab a config lock that is held across I/O, | |
428870ff BB |
1300 | * or may wait for an I/O that needs an interrupt thread |
1301 | * to complete, issue async to avoid deadlock. | |
1302 | * | |
1303 | * For VDEV_IO_START, we cut in line so that the io will | |
1304 | * be sent to disk promptly. | |
34dc7c2f | 1305 | */ |
91579709 BB |
1306 | if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && |
1307 | zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { | |
1308 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); | |
1309 | return; | |
1310 | } | |
1311 | ||
4cec9b2d | 1312 | #ifdef _KERNEL |
91579709 BB |
1313 | /* |
1314 | * If we executing in the context of the tx_sync_thread, | |
1315 | * or we are performing pool initialization outside of a | |
1316 | * zio_taskq[ZIO_TASKQ_ISSUE] context. Then issue the zio | |
1317 | * async to minimize stack usage for these deep call paths. | |
1318 | */ | |
1319 | if ((dp && curthread == dp->dp_tx.tx_sync_thread) || | |
1320 | (dp && spa_is_initializing(dp->dp_spa) && | |
1321 | !zio_taskq_member(zio, ZIO_TASKQ_ISSUE))) { | |
428870ff | 1322 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); |
b128c09f | 1323 | return; |
34dc7c2f | 1324 | } |
4cec9b2d | 1325 | #endif |
34dc7c2f | 1326 | |
b128c09f | 1327 | zio->io_stage = stage; |
428870ff | 1328 | rv = zio_pipeline[highbit(stage) - 1](zio); |
34dc7c2f | 1329 | |
b128c09f BB |
1330 | if (rv == ZIO_PIPELINE_STOP) |
1331 | return; | |
34dc7c2f | 1332 | |
b128c09f BB |
1333 | ASSERT(rv == ZIO_PIPELINE_CONTINUE); |
1334 | } | |
34dc7c2f BB |
1335 | } |
1336 | ||
da6b4005 | 1337 | |
b128c09f BB |
1338 | /* |
1339 | * ========================================================================== | |
1340 | * Initiate I/O, either sync or async | |
1341 | * ========================================================================== | |
1342 | */ | |
1343 | int | |
1344 | zio_wait(zio_t *zio) | |
34dc7c2f | 1345 | { |
b128c09f | 1346 | int error; |
34dc7c2f | 1347 | |
b128c09f BB |
1348 | ASSERT(zio->io_stage == ZIO_STAGE_OPEN); |
1349 | ASSERT(zio->io_executor == NULL); | |
34dc7c2f | 1350 | |
b128c09f | 1351 | zio->io_waiter = curthread; |
34dc7c2f | 1352 | |
da6b4005 | 1353 | __zio_execute(zio); |
34dc7c2f | 1354 | |
b128c09f | 1355 | mutex_enter(&zio->io_lock); |
72f53c56 | 1356 | while (zio->io_executor != NULL) |
72938d69 | 1357 | cv_wait_io(&zio->io_cv, &zio->io_lock); |
b128c09f | 1358 | mutex_exit(&zio->io_lock); |
34dc7c2f | 1359 | |
b128c09f BB |
1360 | error = zio->io_error; |
1361 | zio_destroy(zio); | |
34dc7c2f | 1362 | |
b128c09f BB |
1363 | return (error); |
1364 | } | |
34dc7c2f | 1365 | |
b128c09f BB |
1366 | void |
1367 | zio_nowait(zio_t *zio) | |
1368 | { | |
1369 | ASSERT(zio->io_executor == NULL); | |
34dc7c2f | 1370 | |
d164b209 BB |
1371 | if (zio->io_child_type == ZIO_CHILD_LOGICAL && |
1372 | zio_unique_parent(zio) == NULL) { | |
34dc7c2f | 1373 | /* |
b128c09f | 1374 | * This is a logical async I/O with no parent to wait for it. |
9babb374 BB |
1375 | * We add it to the spa_async_root_zio "Godfather" I/O which |
1376 | * will ensure they complete prior to unloading the pool. | |
34dc7c2f | 1377 | */ |
b128c09f | 1378 | spa_t *spa = zio->io_spa; |
9babb374 BB |
1379 | |
1380 | zio_add_child(spa->spa_async_zio_root, zio); | |
b128c09f | 1381 | } |
34dc7c2f | 1382 | |
da6b4005 | 1383 | __zio_execute(zio); |
b128c09f | 1384 | } |
34dc7c2f | 1385 | |
b128c09f BB |
1386 | /* |
1387 | * ========================================================================== | |
1388 | * Reexecute or suspend/resume failed I/O | |
1389 | * ========================================================================== | |
1390 | */ | |
34dc7c2f | 1391 | |
b128c09f BB |
1392 | static void |
1393 | zio_reexecute(zio_t *pio) | |
1394 | { | |
d164b209 | 1395 | zio_t *cio, *cio_next; |
d6320ddb | 1396 | int c, w; |
d164b209 BB |
1397 | |
1398 | ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); | |
1399 | ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); | |
9babb374 BB |
1400 | ASSERT(pio->io_gang_leader == NULL); |
1401 | ASSERT(pio->io_gang_tree == NULL); | |
34dc7c2f | 1402 | |
b128c09f BB |
1403 | pio->io_flags = pio->io_orig_flags; |
1404 | pio->io_stage = pio->io_orig_stage; | |
1405 | pio->io_pipeline = pio->io_orig_pipeline; | |
1406 | pio->io_reexecute = 0; | |
1407 | pio->io_error = 0; | |
d6320ddb | 1408 | for (w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 | 1409 | pio->io_state[w] = 0; |
d6320ddb | 1410 | for (c = 0; c < ZIO_CHILD_TYPES; c++) |
b128c09f | 1411 | pio->io_child_error[c] = 0; |
34dc7c2f | 1412 | |
428870ff BB |
1413 | if (IO_IS_ALLOCATING(pio)) |
1414 | BP_ZERO(pio->io_bp); | |
34dc7c2f | 1415 | |
b128c09f BB |
1416 | /* |
1417 | * As we reexecute pio's children, new children could be created. | |
d164b209 | 1418 | * New children go to the head of pio's io_child_list, however, |
b128c09f | 1419 | * so we will (correctly) not reexecute them. The key is that |
d164b209 BB |
1420 | * the remainder of pio's io_child_list, from 'cio_next' onward, |
1421 | * cannot be affected by any side effects of reexecuting 'cio'. | |
b128c09f | 1422 | */ |
d164b209 BB |
1423 | for (cio = zio_walk_children(pio); cio != NULL; cio = cio_next) { |
1424 | cio_next = zio_walk_children(pio); | |
b128c09f | 1425 | mutex_enter(&pio->io_lock); |
d6320ddb | 1426 | for (w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 | 1427 | pio->io_children[cio->io_child_type][w]++; |
b128c09f | 1428 | mutex_exit(&pio->io_lock); |
d164b209 | 1429 | zio_reexecute(cio); |
34dc7c2f | 1430 | } |
34dc7c2f | 1431 | |
b128c09f BB |
1432 | /* |
1433 | * Now that all children have been reexecuted, execute the parent. | |
9babb374 BB |
1434 | * We don't reexecute "The Godfather" I/O here as it's the |
1435 | * responsibility of the caller to wait on him. | |
b128c09f | 1436 | */ |
9babb374 | 1437 | if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) |
da6b4005 | 1438 | __zio_execute(pio); |
34dc7c2f BB |
1439 | } |
1440 | ||
b128c09f BB |
1441 | void |
1442 | zio_suspend(spa_t *spa, zio_t *zio) | |
34dc7c2f | 1443 | { |
b128c09f BB |
1444 | if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) |
1445 | fm_panic("Pool '%s' has encountered an uncorrectable I/O " | |
1446 | "failure and the failure mode property for this pool " | |
1447 | "is set to panic.", spa_name(spa)); | |
34dc7c2f | 1448 | |
b128c09f | 1449 | zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); |
34dc7c2f | 1450 | |
b128c09f | 1451 | mutex_enter(&spa->spa_suspend_lock); |
34dc7c2f | 1452 | |
b128c09f | 1453 | if (spa->spa_suspend_zio_root == NULL) |
9babb374 BB |
1454 | spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, |
1455 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | | |
1456 | ZIO_FLAG_GODFATHER); | |
34dc7c2f | 1457 | |
b128c09f | 1458 | spa->spa_suspended = B_TRUE; |
34dc7c2f | 1459 | |
b128c09f | 1460 | if (zio != NULL) { |
9babb374 | 1461 | ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); |
b128c09f BB |
1462 | ASSERT(zio != spa->spa_suspend_zio_root); |
1463 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
d164b209 | 1464 | ASSERT(zio_unique_parent(zio) == NULL); |
b128c09f BB |
1465 | ASSERT(zio->io_stage == ZIO_STAGE_DONE); |
1466 | zio_add_child(spa->spa_suspend_zio_root, zio); | |
1467 | } | |
34dc7c2f | 1468 | |
b128c09f BB |
1469 | mutex_exit(&spa->spa_suspend_lock); |
1470 | } | |
34dc7c2f | 1471 | |
9babb374 | 1472 | int |
b128c09f BB |
1473 | zio_resume(spa_t *spa) |
1474 | { | |
9babb374 | 1475 | zio_t *pio; |
34dc7c2f BB |
1476 | |
1477 | /* | |
b128c09f | 1478 | * Reexecute all previously suspended i/o. |
34dc7c2f | 1479 | */ |
b128c09f BB |
1480 | mutex_enter(&spa->spa_suspend_lock); |
1481 | spa->spa_suspended = B_FALSE; | |
1482 | cv_broadcast(&spa->spa_suspend_cv); | |
1483 | pio = spa->spa_suspend_zio_root; | |
1484 | spa->spa_suspend_zio_root = NULL; | |
1485 | mutex_exit(&spa->spa_suspend_lock); | |
1486 | ||
1487 | if (pio == NULL) | |
9babb374 | 1488 | return (0); |
34dc7c2f | 1489 | |
9babb374 BB |
1490 | zio_reexecute(pio); |
1491 | return (zio_wait(pio)); | |
b128c09f BB |
1492 | } |
1493 | ||
1494 | void | |
1495 | zio_resume_wait(spa_t *spa) | |
1496 | { | |
1497 | mutex_enter(&spa->spa_suspend_lock); | |
1498 | while (spa_suspended(spa)) | |
1499 | cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); | |
1500 | mutex_exit(&spa->spa_suspend_lock); | |
34dc7c2f BB |
1501 | } |
1502 | ||
1503 | /* | |
1504 | * ========================================================================== | |
b128c09f BB |
1505 | * Gang blocks. |
1506 | * | |
1507 | * A gang block is a collection of small blocks that looks to the DMU | |
1508 | * like one large block. When zio_dva_allocate() cannot find a block | |
1509 | * of the requested size, due to either severe fragmentation or the pool | |
1510 | * being nearly full, it calls zio_write_gang_block() to construct the | |
1511 | * block from smaller fragments. | |
1512 | * | |
1513 | * A gang block consists of a gang header (zio_gbh_phys_t) and up to | |
1514 | * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like | |
1515 | * an indirect block: it's an array of block pointers. It consumes | |
1516 | * only one sector and hence is allocatable regardless of fragmentation. | |
1517 | * The gang header's bps point to its gang members, which hold the data. | |
1518 | * | |
1519 | * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> | |
1520 | * as the verifier to ensure uniqueness of the SHA256 checksum. | |
1521 | * Critically, the gang block bp's blk_cksum is the checksum of the data, | |
1522 | * not the gang header. This ensures that data block signatures (needed for | |
1523 | * deduplication) are independent of how the block is physically stored. | |
1524 | * | |
1525 | * Gang blocks can be nested: a gang member may itself be a gang block. | |
1526 | * Thus every gang block is a tree in which root and all interior nodes are | |
1527 | * gang headers, and the leaves are normal blocks that contain user data. | |
1528 | * The root of the gang tree is called the gang leader. | |
1529 | * | |
1530 | * To perform any operation (read, rewrite, free, claim) on a gang block, | |
1531 | * zio_gang_assemble() first assembles the gang tree (minus data leaves) | |
1532 | * in the io_gang_tree field of the original logical i/o by recursively | |
1533 | * reading the gang leader and all gang headers below it. This yields | |
1534 | * an in-core tree containing the contents of every gang header and the | |
1535 | * bps for every constituent of the gang block. | |
1536 | * | |
1537 | * With the gang tree now assembled, zio_gang_issue() just walks the gang tree | |
1538 | * and invokes a callback on each bp. To free a gang block, zio_gang_issue() | |
1539 | * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. | |
1540 | * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). | |
1541 | * zio_read_gang() is a wrapper around zio_read() that omits reading gang | |
1542 | * headers, since we already have those in io_gang_tree. zio_rewrite_gang() | |
1543 | * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() | |
1544 | * of the gang header plus zio_checksum_compute() of the data to update the | |
1545 | * gang header's blk_cksum as described above. | |
1546 | * | |
1547 | * The two-phase assemble/issue model solves the problem of partial failure -- | |
1548 | * what if you'd freed part of a gang block but then couldn't read the | |
1549 | * gang header for another part? Assembling the entire gang tree first | |
1550 | * ensures that all the necessary gang header I/O has succeeded before | |
1551 | * starting the actual work of free, claim, or write. Once the gang tree | |
1552 | * is assembled, free and claim are in-memory operations that cannot fail. | |
1553 | * | |
1554 | * In the event that a gang write fails, zio_dva_unallocate() walks the | |
1555 | * gang tree to immediately free (i.e. insert back into the space map) | |
1556 | * everything we've allocated. This ensures that we don't get ENOSPC | |
1557 | * errors during repeated suspend/resume cycles due to a flaky device. | |
1558 | * | |
1559 | * Gang rewrites only happen during sync-to-convergence. If we can't assemble | |
1560 | * the gang tree, we won't modify the block, so we can safely defer the free | |
1561 | * (knowing that the block is still intact). If we *can* assemble the gang | |
1562 | * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free | |
1563 | * each constituent bp and we can allocate a new block on the next sync pass. | |
1564 | * | |
1565 | * In all cases, the gang tree allows complete recovery from partial failure. | |
34dc7c2f BB |
1566 | * ========================================================================== |
1567 | */ | |
b128c09f BB |
1568 | |
1569 | static zio_t * | |
1570 | zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
34dc7c2f | 1571 | { |
b128c09f BB |
1572 | if (gn != NULL) |
1573 | return (pio); | |
34dc7c2f | 1574 | |
b128c09f BB |
1575 | return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), |
1576 | NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), | |
1577 | &pio->io_bookmark)); | |
1578 | } | |
1579 | ||
1580 | zio_t * | |
1581 | zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
1582 | { | |
1583 | zio_t *zio; | |
1584 | ||
1585 | if (gn != NULL) { | |
1586 | zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, | |
1587 | gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, | |
1588 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f | 1589 | /* |
b128c09f BB |
1590 | * As we rewrite each gang header, the pipeline will compute |
1591 | * a new gang block header checksum for it; but no one will | |
1592 | * compute a new data checksum, so we do that here. The one | |
1593 | * exception is the gang leader: the pipeline already computed | |
1594 | * its data checksum because that stage precedes gang assembly. | |
1595 | * (Presently, nothing actually uses interior data checksums; | |
1596 | * this is just good hygiene.) | |
34dc7c2f | 1597 | */ |
9babb374 | 1598 | if (gn != pio->io_gang_leader->io_gang_tree) { |
b128c09f BB |
1599 | zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), |
1600 | data, BP_GET_PSIZE(bp)); | |
1601 | } | |
428870ff BB |
1602 | /* |
1603 | * If we are here to damage data for testing purposes, | |
1604 | * leave the GBH alone so that we can detect the damage. | |
1605 | */ | |
1606 | if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) | |
1607 | zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; | |
34dc7c2f | 1608 | } else { |
b128c09f BB |
1609 | zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, |
1610 | data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, | |
1611 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f BB |
1612 | } |
1613 | ||
b128c09f BB |
1614 | return (zio); |
1615 | } | |
34dc7c2f | 1616 | |
b128c09f BB |
1617 | /* ARGSUSED */ |
1618 | zio_t * | |
1619 | zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
1620 | { | |
428870ff BB |
1621 | return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, |
1622 | ZIO_GANG_CHILD_FLAGS(pio))); | |
34dc7c2f BB |
1623 | } |
1624 | ||
b128c09f BB |
1625 | /* ARGSUSED */ |
1626 | zio_t * | |
1627 | zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
34dc7c2f | 1628 | { |
b128c09f BB |
1629 | return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, |
1630 | NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); | |
1631 | } | |
1632 | ||
1633 | static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { | |
1634 | NULL, | |
1635 | zio_read_gang, | |
1636 | zio_rewrite_gang, | |
1637 | zio_free_gang, | |
1638 | zio_claim_gang, | |
1639 | NULL | |
1640 | }; | |
34dc7c2f | 1641 | |
b128c09f | 1642 | static void zio_gang_tree_assemble_done(zio_t *zio); |
34dc7c2f | 1643 | |
b128c09f BB |
1644 | static zio_gang_node_t * |
1645 | zio_gang_node_alloc(zio_gang_node_t **gnpp) | |
1646 | { | |
1647 | zio_gang_node_t *gn; | |
34dc7c2f | 1648 | |
b128c09f | 1649 | ASSERT(*gnpp == NULL); |
34dc7c2f | 1650 | |
691f6ac4 | 1651 | gn = kmem_zalloc(sizeof (*gn), KM_PUSHPAGE); |
b128c09f BB |
1652 | gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); |
1653 | *gnpp = gn; | |
34dc7c2f | 1654 | |
b128c09f | 1655 | return (gn); |
34dc7c2f BB |
1656 | } |
1657 | ||
34dc7c2f | 1658 | static void |
b128c09f | 1659 | zio_gang_node_free(zio_gang_node_t **gnpp) |
34dc7c2f | 1660 | { |
b128c09f | 1661 | zio_gang_node_t *gn = *gnpp; |
d6320ddb | 1662 | int g; |
34dc7c2f | 1663 | |
d6320ddb | 1664 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) |
b128c09f BB |
1665 | ASSERT(gn->gn_child[g] == NULL); |
1666 | ||
1667 | zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); | |
1668 | kmem_free(gn, sizeof (*gn)); | |
1669 | *gnpp = NULL; | |
34dc7c2f BB |
1670 | } |
1671 | ||
b128c09f BB |
1672 | static void |
1673 | zio_gang_tree_free(zio_gang_node_t **gnpp) | |
34dc7c2f | 1674 | { |
b128c09f | 1675 | zio_gang_node_t *gn = *gnpp; |
d6320ddb | 1676 | int g; |
34dc7c2f | 1677 | |
b128c09f BB |
1678 | if (gn == NULL) |
1679 | return; | |
34dc7c2f | 1680 | |
d6320ddb | 1681 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) |
b128c09f | 1682 | zio_gang_tree_free(&gn->gn_child[g]); |
34dc7c2f | 1683 | |
b128c09f | 1684 | zio_gang_node_free(gnpp); |
34dc7c2f BB |
1685 | } |
1686 | ||
b128c09f | 1687 | static void |
9babb374 | 1688 | zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) |
34dc7c2f | 1689 | { |
b128c09f BB |
1690 | zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); |
1691 | ||
9babb374 | 1692 | ASSERT(gio->io_gang_leader == gio); |
b128c09f | 1693 | ASSERT(BP_IS_GANG(bp)); |
34dc7c2f | 1694 | |
9babb374 | 1695 | zio_nowait(zio_read(gio, gio->io_spa, bp, gn->gn_gbh, |
b128c09f | 1696 | SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, |
9babb374 | 1697 | gio->io_priority, ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); |
b128c09f | 1698 | } |
34dc7c2f | 1699 | |
b128c09f BB |
1700 | static void |
1701 | zio_gang_tree_assemble_done(zio_t *zio) | |
1702 | { | |
9babb374 | 1703 | zio_t *gio = zio->io_gang_leader; |
b128c09f BB |
1704 | zio_gang_node_t *gn = zio->io_private; |
1705 | blkptr_t *bp = zio->io_bp; | |
d6320ddb | 1706 | int g; |
34dc7c2f | 1707 | |
9babb374 | 1708 | ASSERT(gio == zio_unique_parent(zio)); |
428870ff | 1709 | ASSERT(zio->io_child_count == 0); |
34dc7c2f | 1710 | |
b128c09f BB |
1711 | if (zio->io_error) |
1712 | return; | |
34dc7c2f | 1713 | |
b128c09f BB |
1714 | if (BP_SHOULD_BYTESWAP(bp)) |
1715 | byteswap_uint64_array(zio->io_data, zio->io_size); | |
34dc7c2f | 1716 | |
b128c09f BB |
1717 | ASSERT(zio->io_data == gn->gn_gbh); |
1718 | ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); | |
428870ff | 1719 | ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); |
34dc7c2f | 1720 | |
d6320ddb | 1721 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
1722 | blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; |
1723 | if (!BP_IS_GANG(gbp)) | |
1724 | continue; | |
9babb374 | 1725 | zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); |
b128c09f | 1726 | } |
34dc7c2f BB |
1727 | } |
1728 | ||
b128c09f BB |
1729 | static void |
1730 | zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) | |
34dc7c2f | 1731 | { |
9babb374 | 1732 | zio_t *gio = pio->io_gang_leader; |
b128c09f | 1733 | zio_t *zio; |
d6320ddb | 1734 | int g; |
34dc7c2f | 1735 | |
b128c09f | 1736 | ASSERT(BP_IS_GANG(bp) == !!gn); |
9babb374 BB |
1737 | ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); |
1738 | ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); | |
34dc7c2f | 1739 | |
b128c09f BB |
1740 | /* |
1741 | * If you're a gang header, your data is in gn->gn_gbh. | |
1742 | * If you're a gang member, your data is in 'data' and gn == NULL. | |
1743 | */ | |
9babb374 | 1744 | zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data); |
34dc7c2f | 1745 | |
b128c09f | 1746 | if (gn != NULL) { |
428870ff | 1747 | ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); |
34dc7c2f | 1748 | |
d6320ddb | 1749 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
1750 | blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; |
1751 | if (BP_IS_HOLE(gbp)) | |
1752 | continue; | |
1753 | zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); | |
1754 | data = (char *)data + BP_GET_PSIZE(gbp); | |
1755 | } | |
34dc7c2f BB |
1756 | } |
1757 | ||
9babb374 BB |
1758 | if (gn == gio->io_gang_tree) |
1759 | ASSERT3P((char *)gio->io_data + gio->io_size, ==, data); | |
34dc7c2f | 1760 | |
b128c09f BB |
1761 | if (zio != pio) |
1762 | zio_nowait(zio); | |
34dc7c2f BB |
1763 | } |
1764 | ||
1765 | static int | |
b128c09f | 1766 | zio_gang_assemble(zio_t *zio) |
34dc7c2f | 1767 | { |
b128c09f | 1768 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 1769 | |
9babb374 BB |
1770 | ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); |
1771 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
1772 | ||
1773 | zio->io_gang_leader = zio; | |
34dc7c2f | 1774 | |
b128c09f | 1775 | zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); |
34dc7c2f BB |
1776 | |
1777 | return (ZIO_PIPELINE_CONTINUE); | |
1778 | } | |
1779 | ||
1780 | static int | |
b128c09f | 1781 | zio_gang_issue(zio_t *zio) |
34dc7c2f | 1782 | { |
b128c09f | 1783 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 1784 | |
b128c09f BB |
1785 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) |
1786 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 1787 | |
9babb374 BB |
1788 | ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); |
1789 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
34dc7c2f | 1790 | |
b128c09f | 1791 | if (zio->io_child_error[ZIO_CHILD_GANG] == 0) |
9babb374 | 1792 | zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_data); |
b128c09f | 1793 | else |
9babb374 | 1794 | zio_gang_tree_free(&zio->io_gang_tree); |
34dc7c2f | 1795 | |
b128c09f | 1796 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
34dc7c2f BB |
1797 | |
1798 | return (ZIO_PIPELINE_CONTINUE); | |
1799 | } | |
1800 | ||
1801 | static void | |
b128c09f | 1802 | zio_write_gang_member_ready(zio_t *zio) |
34dc7c2f | 1803 | { |
d164b209 | 1804 | zio_t *pio = zio_unique_parent(zio); |
1fde1e37 | 1805 | ASSERTV(zio_t *gio = zio->io_gang_leader;) |
34dc7c2f BB |
1806 | dva_t *cdva = zio->io_bp->blk_dva; |
1807 | dva_t *pdva = pio->io_bp->blk_dva; | |
1808 | uint64_t asize; | |
d6320ddb | 1809 | int d; |
34dc7c2f | 1810 | |
b128c09f BB |
1811 | if (BP_IS_HOLE(zio->io_bp)) |
1812 | return; | |
1813 | ||
1814 | ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); | |
1815 | ||
1816 | ASSERT(zio->io_child_type == ZIO_CHILD_GANG); | |
428870ff BB |
1817 | ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); |
1818 | ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); | |
1819 | ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); | |
34dc7c2f | 1820 | ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); |
34dc7c2f BB |
1821 | |
1822 | mutex_enter(&pio->io_lock); | |
d6320ddb | 1823 | for (d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { |
34dc7c2f BB |
1824 | ASSERT(DVA_GET_GANG(&pdva[d])); |
1825 | asize = DVA_GET_ASIZE(&pdva[d]); | |
1826 | asize += DVA_GET_ASIZE(&cdva[d]); | |
1827 | DVA_SET_ASIZE(&pdva[d], asize); | |
1828 | } | |
1829 | mutex_exit(&pio->io_lock); | |
1830 | } | |
1831 | ||
1832 | static int | |
b128c09f | 1833 | zio_write_gang_block(zio_t *pio) |
34dc7c2f | 1834 | { |
b128c09f BB |
1835 | spa_t *spa = pio->io_spa; |
1836 | blkptr_t *bp = pio->io_bp; | |
9babb374 | 1837 | zio_t *gio = pio->io_gang_leader; |
b128c09f BB |
1838 | zio_t *zio; |
1839 | zio_gang_node_t *gn, **gnpp; | |
34dc7c2f | 1840 | zio_gbh_phys_t *gbh; |
b128c09f BB |
1841 | uint64_t txg = pio->io_txg; |
1842 | uint64_t resid = pio->io_size; | |
1843 | uint64_t lsize; | |
428870ff BB |
1844 | int copies = gio->io_prop.zp_copies; |
1845 | int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); | |
b128c09f | 1846 | zio_prop_t zp; |
d6320ddb | 1847 | int g, error; |
34dc7c2f | 1848 | |
428870ff BB |
1849 | error = metaslab_alloc(spa, spa_normal_class(spa), SPA_GANGBLOCKSIZE, |
1850 | bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, | |
b128c09f | 1851 | METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); |
34dc7c2f | 1852 | if (error) { |
b128c09f | 1853 | pio->io_error = error; |
34dc7c2f BB |
1854 | return (ZIO_PIPELINE_CONTINUE); |
1855 | } | |
1856 | ||
9babb374 BB |
1857 | if (pio == gio) { |
1858 | gnpp = &gio->io_gang_tree; | |
b128c09f BB |
1859 | } else { |
1860 | gnpp = pio->io_private; | |
1861 | ASSERT(pio->io_ready == zio_write_gang_member_ready); | |
34dc7c2f BB |
1862 | } |
1863 | ||
b128c09f BB |
1864 | gn = zio_gang_node_alloc(gnpp); |
1865 | gbh = gn->gn_gbh; | |
1866 | bzero(gbh, SPA_GANGBLOCKSIZE); | |
34dc7c2f | 1867 | |
b128c09f BB |
1868 | /* |
1869 | * Create the gang header. | |
1870 | */ | |
1871 | zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, | |
1872 | pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f | 1873 | |
b128c09f BB |
1874 | /* |
1875 | * Create and nowait the gang children. | |
1876 | */ | |
d6320ddb | 1877 | for (g = 0; resid != 0; resid -= lsize, g++) { |
b128c09f BB |
1878 | lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), |
1879 | SPA_MINBLOCKSIZE); | |
1880 | ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); | |
1881 | ||
9babb374 | 1882 | zp.zp_checksum = gio->io_prop.zp_checksum; |
b128c09f BB |
1883 | zp.zp_compress = ZIO_COMPRESS_OFF; |
1884 | zp.zp_type = DMU_OT_NONE; | |
1885 | zp.zp_level = 0; | |
428870ff BB |
1886 | zp.zp_copies = gio->io_prop.zp_copies; |
1887 | zp.zp_dedup = 0; | |
1888 | zp.zp_dedup_verify = 0; | |
b128c09f BB |
1889 | |
1890 | zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], | |
1891 | (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, | |
1892 | zio_write_gang_member_ready, NULL, &gn->gn_child[g], | |
1893 | pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), | |
1894 | &pio->io_bookmark)); | |
1895 | } | |
34dc7c2f BB |
1896 | |
1897 | /* | |
b128c09f | 1898 | * Set pio's pipeline to just wait for zio to finish. |
34dc7c2f | 1899 | */ |
b128c09f BB |
1900 | pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
1901 | ||
920dd524 ED |
1902 | /* |
1903 | * We didn't allocate this bp, so make sure it doesn't get unmarked. | |
1904 | */ | |
1905 | pio->io_flags &= ~ZIO_FLAG_FASTWRITE; | |
1906 | ||
b128c09f BB |
1907 | zio_nowait(zio); |
1908 | ||
1909 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f BB |
1910 | } |
1911 | ||
1912 | /* | |
1913 | * ========================================================================== | |
428870ff | 1914 | * Dedup |
34dc7c2f BB |
1915 | * ========================================================================== |
1916 | */ | |
428870ff BB |
1917 | static void |
1918 | zio_ddt_child_read_done(zio_t *zio) | |
1919 | { | |
1920 | blkptr_t *bp = zio->io_bp; | |
1921 | ddt_entry_t *dde = zio->io_private; | |
1922 | ddt_phys_t *ddp; | |
1923 | zio_t *pio = zio_unique_parent(zio); | |
1924 | ||
1925 | mutex_enter(&pio->io_lock); | |
1926 | ddp = ddt_phys_select(dde, bp); | |
1927 | if (zio->io_error == 0) | |
1928 | ddt_phys_clear(ddp); /* this ddp doesn't need repair */ | |
1929 | if (zio->io_error == 0 && dde->dde_repair_data == NULL) | |
1930 | dde->dde_repair_data = zio->io_data; | |
1931 | else | |
1932 | zio_buf_free(zio->io_data, zio->io_size); | |
1933 | mutex_exit(&pio->io_lock); | |
1934 | } | |
1935 | ||
1936 | static int | |
1937 | zio_ddt_read_start(zio_t *zio) | |
1938 | { | |
1939 | blkptr_t *bp = zio->io_bp; | |
d6320ddb | 1940 | int p; |
428870ff BB |
1941 | |
1942 | ASSERT(BP_GET_DEDUP(bp)); | |
1943 | ASSERT(BP_GET_PSIZE(bp) == zio->io_size); | |
1944 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1945 | ||
1946 | if (zio->io_child_error[ZIO_CHILD_DDT]) { | |
1947 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
1948 | ddt_entry_t *dde = ddt_repair_start(ddt, bp); | |
1949 | ddt_phys_t *ddp = dde->dde_phys; | |
1950 | ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); | |
1951 | blkptr_t blk; | |
1952 | ||
1953 | ASSERT(zio->io_vsd == NULL); | |
1954 | zio->io_vsd = dde; | |
1955 | ||
1956 | if (ddp_self == NULL) | |
1957 | return (ZIO_PIPELINE_CONTINUE); | |
1958 | ||
d6320ddb | 1959 | for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff BB |
1960 | if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) |
1961 | continue; | |
1962 | ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, | |
1963 | &blk); | |
1964 | zio_nowait(zio_read(zio, zio->io_spa, &blk, | |
1965 | zio_buf_alloc(zio->io_size), zio->io_size, | |
1966 | zio_ddt_child_read_done, dde, zio->io_priority, | |
1967 | ZIO_DDT_CHILD_FLAGS(zio) | ZIO_FLAG_DONT_PROPAGATE, | |
1968 | &zio->io_bookmark)); | |
1969 | } | |
1970 | return (ZIO_PIPELINE_CONTINUE); | |
1971 | } | |
1972 | ||
1973 | zio_nowait(zio_read(zio, zio->io_spa, bp, | |
1974 | zio->io_data, zio->io_size, NULL, NULL, zio->io_priority, | |
1975 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); | |
1976 | ||
1977 | return (ZIO_PIPELINE_CONTINUE); | |
1978 | } | |
1979 | ||
1980 | static int | |
1981 | zio_ddt_read_done(zio_t *zio) | |
1982 | { | |
1983 | blkptr_t *bp = zio->io_bp; | |
1984 | ||
1985 | if (zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE)) | |
1986 | return (ZIO_PIPELINE_STOP); | |
1987 | ||
1988 | ASSERT(BP_GET_DEDUP(bp)); | |
1989 | ASSERT(BP_GET_PSIZE(bp) == zio->io_size); | |
1990 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1991 | ||
1992 | if (zio->io_child_error[ZIO_CHILD_DDT]) { | |
1993 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
1994 | ddt_entry_t *dde = zio->io_vsd; | |
1995 | if (ddt == NULL) { | |
1996 | ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE); | |
1997 | return (ZIO_PIPELINE_CONTINUE); | |
1998 | } | |
1999 | if (dde == NULL) { | |
2000 | zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; | |
2001 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); | |
2002 | return (ZIO_PIPELINE_STOP); | |
2003 | } | |
2004 | if (dde->dde_repair_data != NULL) { | |
2005 | bcopy(dde->dde_repair_data, zio->io_data, zio->io_size); | |
2006 | zio->io_child_error[ZIO_CHILD_DDT] = 0; | |
2007 | } | |
2008 | ddt_repair_done(ddt, dde); | |
2009 | zio->io_vsd = NULL; | |
2010 | } | |
2011 | ||
2012 | ASSERT(zio->io_vsd == NULL); | |
2013 | ||
2014 | return (ZIO_PIPELINE_CONTINUE); | |
2015 | } | |
2016 | ||
2017 | static boolean_t | |
2018 | zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) | |
2019 | { | |
2020 | spa_t *spa = zio->io_spa; | |
d6320ddb | 2021 | int p; |
428870ff BB |
2022 | |
2023 | /* | |
2024 | * Note: we compare the original data, not the transformed data, | |
2025 | * because when zio->io_bp is an override bp, we will not have | |
2026 | * pushed the I/O transforms. That's an important optimization | |
2027 | * because otherwise we'd compress/encrypt all dmu_sync() data twice. | |
2028 | */ | |
d6320ddb | 2029 | for (p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { |
428870ff BB |
2030 | zio_t *lio = dde->dde_lead_zio[p]; |
2031 | ||
2032 | if (lio != NULL) { | |
2033 | return (lio->io_orig_size != zio->io_orig_size || | |
2034 | bcmp(zio->io_orig_data, lio->io_orig_data, | |
2035 | zio->io_orig_size) != 0); | |
2036 | } | |
2037 | } | |
2038 | ||
d6320ddb | 2039 | for (p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { |
428870ff BB |
2040 | ddt_phys_t *ddp = &dde->dde_phys[p]; |
2041 | ||
2042 | if (ddp->ddp_phys_birth != 0) { | |
2043 | arc_buf_t *abuf = NULL; | |
2044 | uint32_t aflags = ARC_WAIT; | |
2045 | blkptr_t blk = *zio->io_bp; | |
2046 | int error; | |
2047 | ||
2048 | ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); | |
2049 | ||
2050 | ddt_exit(ddt); | |
2051 | ||
2052 | error = arc_read_nolock(NULL, spa, &blk, | |
2053 | arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, | |
2054 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, | |
2055 | &aflags, &zio->io_bookmark); | |
2056 | ||
2057 | if (error == 0) { | |
2058 | if (arc_buf_size(abuf) != zio->io_orig_size || | |
2059 | bcmp(abuf->b_data, zio->io_orig_data, | |
2060 | zio->io_orig_size) != 0) | |
2061 | error = EEXIST; | |
2062 | VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); | |
2063 | } | |
2064 | ||
2065 | ddt_enter(ddt); | |
2066 | return (error != 0); | |
2067 | } | |
2068 | } | |
2069 | ||
2070 | return (B_FALSE); | |
2071 | } | |
2072 | ||
2073 | static void | |
2074 | zio_ddt_child_write_ready(zio_t *zio) | |
2075 | { | |
2076 | int p = zio->io_prop.zp_copies; | |
2077 | ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); | |
2078 | ddt_entry_t *dde = zio->io_private; | |
2079 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
2080 | zio_t *pio; | |
2081 | ||
2082 | if (zio->io_error) | |
2083 | return; | |
2084 | ||
2085 | ddt_enter(ddt); | |
2086 | ||
2087 | ASSERT(dde->dde_lead_zio[p] == zio); | |
2088 | ||
2089 | ddt_phys_fill(ddp, zio->io_bp); | |
2090 | ||
2091 | while ((pio = zio_walk_parents(zio)) != NULL) | |
2092 | ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); | |
2093 | ||
2094 | ddt_exit(ddt); | |
2095 | } | |
2096 | ||
2097 | static void | |
2098 | zio_ddt_child_write_done(zio_t *zio) | |
2099 | { | |
2100 | int p = zio->io_prop.zp_copies; | |
2101 | ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); | |
2102 | ddt_entry_t *dde = zio->io_private; | |
2103 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
2104 | ||
2105 | ddt_enter(ddt); | |
2106 | ||
2107 | ASSERT(ddp->ddp_refcnt == 0); | |
2108 | ASSERT(dde->dde_lead_zio[p] == zio); | |
2109 | dde->dde_lead_zio[p] = NULL; | |
2110 | ||
2111 | if (zio->io_error == 0) { | |
2112 | while (zio_walk_parents(zio) != NULL) | |
2113 | ddt_phys_addref(ddp); | |
2114 | } else { | |
2115 | ddt_phys_clear(ddp); | |
2116 | } | |
2117 | ||
2118 | ddt_exit(ddt); | |
2119 | } | |
2120 | ||
2121 | static void | |
2122 | zio_ddt_ditto_write_done(zio_t *zio) | |
2123 | { | |
2124 | int p = DDT_PHYS_DITTO; | |
428870ff BB |
2125 | blkptr_t *bp = zio->io_bp; |
2126 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
2127 | ddt_entry_t *dde = zio->io_private; | |
2128 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
2129 | ddt_key_t *ddk = &dde->dde_key; | |
1fde1e37 | 2130 | ASSERTV(zio_prop_t *zp = &zio->io_prop); |
428870ff BB |
2131 | |
2132 | ddt_enter(ddt); | |
2133 | ||
2134 | ASSERT(ddp->ddp_refcnt == 0); | |
2135 | ASSERT(dde->dde_lead_zio[p] == zio); | |
2136 | dde->dde_lead_zio[p] = NULL; | |
2137 | ||
2138 | if (zio->io_error == 0) { | |
2139 | ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); | |
2140 | ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); | |
2141 | ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); | |
2142 | if (ddp->ddp_phys_birth != 0) | |
2143 | ddt_phys_free(ddt, ddk, ddp, zio->io_txg); | |
2144 | ddt_phys_fill(ddp, bp); | |
2145 | } | |
2146 | ||
2147 | ddt_exit(ddt); | |
2148 | } | |
2149 | ||
2150 | static int | |
2151 | zio_ddt_write(zio_t *zio) | |
2152 | { | |
2153 | spa_t *spa = zio->io_spa; | |
2154 | blkptr_t *bp = zio->io_bp; | |
2155 | uint64_t txg = zio->io_txg; | |
2156 | zio_prop_t *zp = &zio->io_prop; | |
2157 | int p = zp->zp_copies; | |
2158 | int ditto_copies; | |
2159 | zio_t *cio = NULL; | |
2160 | zio_t *dio = NULL; | |
2161 | ddt_t *ddt = ddt_select(spa, bp); | |
2162 | ddt_entry_t *dde; | |
2163 | ddt_phys_t *ddp; | |
2164 | ||
2165 | ASSERT(BP_GET_DEDUP(bp)); | |
2166 | ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); | |
2167 | ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); | |
2168 | ||
2169 | ddt_enter(ddt); | |
2170 | dde = ddt_lookup(ddt, bp, B_TRUE); | |
2171 | ddp = &dde->dde_phys[p]; | |
2172 | ||
2173 | if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { | |
2174 | /* | |
2175 | * If we're using a weak checksum, upgrade to a strong checksum | |
2176 | * and try again. If we're already using a strong checksum, | |
2177 | * we can't resolve it, so just convert to an ordinary write. | |
2178 | * (And automatically e-mail a paper to Nature?) | |
2179 | */ | |
2180 | if (!zio_checksum_table[zp->zp_checksum].ci_dedup) { | |
2181 | zp->zp_checksum = spa_dedup_checksum(spa); | |
2182 | zio_pop_transforms(zio); | |
2183 | zio->io_stage = ZIO_STAGE_OPEN; | |
2184 | BP_ZERO(bp); | |
2185 | } else { | |
2186 | zp->zp_dedup = 0; | |
2187 | } | |
2188 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
2189 | ddt_exit(ddt); | |
2190 | return (ZIO_PIPELINE_CONTINUE); | |
2191 | } | |
2192 | ||
2193 | ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); | |
2194 | ASSERT(ditto_copies < SPA_DVAS_PER_BP); | |
2195 | ||
2196 | if (ditto_copies > ddt_ditto_copies_present(dde) && | |
2197 | dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { | |
2198 | zio_prop_t czp = *zp; | |
2199 | ||
2200 | czp.zp_copies = ditto_copies; | |
2201 | ||
2202 | /* | |
2203 | * If we arrived here with an override bp, we won't have run | |
2204 | * the transform stack, so we won't have the data we need to | |
2205 | * generate a child i/o. So, toss the override bp and restart. | |
2206 | * This is safe, because using the override bp is just an | |
2207 | * optimization; and it's rare, so the cost doesn't matter. | |
2208 | */ | |
2209 | if (zio->io_bp_override) { | |
2210 | zio_pop_transforms(zio); | |
2211 | zio->io_stage = ZIO_STAGE_OPEN; | |
2212 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
2213 | zio->io_bp_override = NULL; | |
2214 | BP_ZERO(bp); | |
2215 | ddt_exit(ddt); | |
2216 | return (ZIO_PIPELINE_CONTINUE); | |
2217 | } | |
2218 | ||
2219 | dio = zio_write(zio, spa, txg, bp, zio->io_orig_data, | |
2220 | zio->io_orig_size, &czp, NULL, | |
2221 | zio_ddt_ditto_write_done, dde, zio->io_priority, | |
2222 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); | |
2223 | ||
2224 | zio_push_transform(dio, zio->io_data, zio->io_size, 0, NULL); | |
2225 | dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; | |
2226 | } | |
2227 | ||
2228 | if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { | |
2229 | if (ddp->ddp_phys_birth != 0) | |
2230 | ddt_bp_fill(ddp, bp, txg); | |
2231 | if (dde->dde_lead_zio[p] != NULL) | |
2232 | zio_add_child(zio, dde->dde_lead_zio[p]); | |
2233 | else | |
2234 | ddt_phys_addref(ddp); | |
2235 | } else if (zio->io_bp_override) { | |
2236 | ASSERT(bp->blk_birth == txg); | |
2237 | ASSERT(BP_EQUAL(bp, zio->io_bp_override)); | |
2238 | ddt_phys_fill(ddp, bp); | |
2239 | ddt_phys_addref(ddp); | |
2240 | } else { | |
2241 | cio = zio_write(zio, spa, txg, bp, zio->io_orig_data, | |
2242 | zio->io_orig_size, zp, zio_ddt_child_write_ready, | |
2243 | zio_ddt_child_write_done, dde, zio->io_priority, | |
2244 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); | |
2245 | ||
2246 | zio_push_transform(cio, zio->io_data, zio->io_size, 0, NULL); | |
2247 | dde->dde_lead_zio[p] = cio; | |
2248 | } | |
2249 | ||
2250 | ddt_exit(ddt); | |
2251 | ||
2252 | if (cio) | |
2253 | zio_nowait(cio); | |
2254 | if (dio) | |
2255 | zio_nowait(dio); | |
2256 | ||
2257 | return (ZIO_PIPELINE_CONTINUE); | |
2258 | } | |
2259 | ||
2260 | ddt_entry_t *freedde; /* for debugging */ | |
b128c09f | 2261 | |
428870ff BB |
2262 | static int |
2263 | zio_ddt_free(zio_t *zio) | |
2264 | { | |
2265 | spa_t *spa = zio->io_spa; | |
2266 | blkptr_t *bp = zio->io_bp; | |
2267 | ddt_t *ddt = ddt_select(spa, bp); | |
2268 | ddt_entry_t *dde; | |
2269 | ddt_phys_t *ddp; | |
2270 | ||
2271 | ASSERT(BP_GET_DEDUP(bp)); | |
2272 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
2273 | ||
2274 | ddt_enter(ddt); | |
2275 | freedde = dde = ddt_lookup(ddt, bp, B_TRUE); | |
5dc6af0e BB |
2276 | if (dde) { |
2277 | ddp = ddt_phys_select(dde, bp); | |
2278 | if (ddp) | |
2279 | ddt_phys_decref(ddp); | |
2280 | } | |
428870ff BB |
2281 | ddt_exit(ddt); |
2282 | ||
2283 | return (ZIO_PIPELINE_CONTINUE); | |
2284 | } | |
2285 | ||
2286 | /* | |
2287 | * ========================================================================== | |
2288 | * Allocate and free blocks | |
2289 | * ========================================================================== | |
2290 | */ | |
34dc7c2f BB |
2291 | static int |
2292 | zio_dva_allocate(zio_t *zio) | |
2293 | { | |
2294 | spa_t *spa = zio->io_spa; | |
428870ff | 2295 | metaslab_class_t *mc = spa_normal_class(spa); |
34dc7c2f BB |
2296 | blkptr_t *bp = zio->io_bp; |
2297 | int error; | |
6d974228 | 2298 | int flags = 0; |
34dc7c2f | 2299 | |
9babb374 BB |
2300 | if (zio->io_gang_leader == NULL) { |
2301 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
2302 | zio->io_gang_leader = zio; | |
2303 | } | |
2304 | ||
34dc7c2f | 2305 | ASSERT(BP_IS_HOLE(bp)); |
c99c9001 | 2306 | ASSERT0(BP_GET_NDVAS(bp)); |
428870ff BB |
2307 | ASSERT3U(zio->io_prop.zp_copies, >, 0); |
2308 | ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); | |
34dc7c2f BB |
2309 | ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); |
2310 | ||
6d974228 GW |
2311 | /* |
2312 | * The dump device does not support gang blocks so allocation on | |
2313 | * behalf of the dump device (i.e. ZIO_FLAG_NODATA) must avoid | |
2314 | * the "fast" gang feature. | |
2315 | */ | |
2316 | flags |= (zio->io_flags & ZIO_FLAG_NODATA) ? METASLAB_GANG_AVOID : 0; | |
2317 | flags |= (zio->io_flags & ZIO_FLAG_GANG_CHILD) ? | |
2318 | METASLAB_GANG_CHILD : 0; | |
920dd524 | 2319 | flags |= (zio->io_flags & ZIO_FLAG_FASTWRITE) ? METASLAB_FASTWRITE : 0; |
b128c09f | 2320 | error = metaslab_alloc(spa, mc, zio->io_size, bp, |
6d974228 | 2321 | zio->io_prop.zp_copies, zio->io_txg, NULL, flags); |
34dc7c2f | 2322 | |
b128c09f | 2323 | if (error) { |
6d974228 GW |
2324 | spa_dbgmsg(spa, "%s: metaslab allocation failure: zio %p, " |
2325 | "size %llu, error %d", spa_name(spa), zio, zio->io_size, | |
2326 | error); | |
b128c09f BB |
2327 | if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) |
2328 | return (zio_write_gang_block(zio)); | |
34dc7c2f BB |
2329 | zio->io_error = error; |
2330 | } | |
2331 | ||
2332 | return (ZIO_PIPELINE_CONTINUE); | |
2333 | } | |
2334 | ||
2335 | static int | |
2336 | zio_dva_free(zio_t *zio) | |
2337 | { | |
b128c09f | 2338 | metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); |
34dc7c2f BB |
2339 | |
2340 | return (ZIO_PIPELINE_CONTINUE); | |
2341 | } | |
2342 | ||
2343 | static int | |
2344 | zio_dva_claim(zio_t *zio) | |
2345 | { | |
b128c09f BB |
2346 | int error; |
2347 | ||
2348 | error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); | |
2349 | if (error) | |
2350 | zio->io_error = error; | |
34dc7c2f BB |
2351 | |
2352 | return (ZIO_PIPELINE_CONTINUE); | |
2353 | } | |
2354 | ||
b128c09f BB |
2355 | /* |
2356 | * Undo an allocation. This is used by zio_done() when an I/O fails | |
2357 | * and we want to give back the block we just allocated. | |
2358 | * This handles both normal blocks and gang blocks. | |
2359 | */ | |
2360 | static void | |
2361 | zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) | |
2362 | { | |
d6320ddb BB |
2363 | int g; |
2364 | ||
b128c09f | 2365 | ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); |
428870ff | 2366 | ASSERT(zio->io_bp_override == NULL); |
b128c09f BB |
2367 | |
2368 | if (!BP_IS_HOLE(bp)) | |
428870ff | 2369 | metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); |
b128c09f BB |
2370 | |
2371 | if (gn != NULL) { | |
d6320ddb | 2372 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
2373 | zio_dva_unallocate(zio, gn->gn_child[g], |
2374 | &gn->gn_gbh->zg_blkptr[g]); | |
2375 | } | |
2376 | } | |
2377 | } | |
2378 | ||
2379 | /* | |
2380 | * Try to allocate an intent log block. Return 0 on success, errno on failure. | |
2381 | */ | |
2382 | int | |
920dd524 ED |
2383 | zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, uint64_t size, |
2384 | boolean_t use_slog) | |
b128c09f | 2385 | { |
428870ff | 2386 | int error = 1; |
b128c09f | 2387 | |
428870ff BB |
2388 | ASSERT(txg > spa_syncing_txg(spa)); |
2389 | ||
ebf8e3a2 BB |
2390 | /* |
2391 | * ZIL blocks are always contiguous (i.e. not gang blocks) so we | |
2392 | * set the METASLAB_GANG_AVOID flag so that they don't "fast gang" | |
2393 | * when allocating them. | |
2394 | */ | |
2395 | if (use_slog) { | |
428870ff | 2396 | error = metaslab_alloc(spa, spa_log_class(spa), size, |
920dd524 ED |
2397 | new_bp, 1, txg, NULL, |
2398 | METASLAB_FASTWRITE | METASLAB_GANG_AVOID); | |
ebf8e3a2 | 2399 | } |
b128c09f | 2400 | |
ebf8e3a2 | 2401 | if (error) { |
428870ff | 2402 | error = metaslab_alloc(spa, spa_normal_class(spa), size, |
920dd524 ED |
2403 | new_bp, 1, txg, NULL, |
2404 | METASLAB_FASTWRITE | METASLAB_GANG_AVOID); | |
ebf8e3a2 | 2405 | } |
b128c09f BB |
2406 | |
2407 | if (error == 0) { | |
2408 | BP_SET_LSIZE(new_bp, size); | |
2409 | BP_SET_PSIZE(new_bp, size); | |
2410 | BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); | |
428870ff BB |
2411 | BP_SET_CHECKSUM(new_bp, |
2412 | spa_version(spa) >= SPA_VERSION_SLIM_ZIL | |
2413 | ? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG); | |
b128c09f BB |
2414 | BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); |
2415 | BP_SET_LEVEL(new_bp, 0); | |
428870ff | 2416 | BP_SET_DEDUP(new_bp, 0); |
b128c09f BB |
2417 | BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); |
2418 | } | |
2419 | ||
2420 | return (error); | |
2421 | } | |
2422 | ||
2423 | /* | |
428870ff | 2424 | * Free an intent log block. |
b128c09f BB |
2425 | */ |
2426 | void | |
428870ff | 2427 | zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp) |
b128c09f | 2428 | { |
428870ff | 2429 | ASSERT(BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG); |
b128c09f BB |
2430 | ASSERT(!BP_IS_GANG(bp)); |
2431 | ||
428870ff | 2432 | zio_free(spa, txg, bp); |
b128c09f BB |
2433 | } |
2434 | ||
34dc7c2f BB |
2435 | /* |
2436 | * ========================================================================== | |
2437 | * Read and write to physical devices | |
2438 | * ========================================================================== | |
2439 | */ | |
34dc7c2f BB |
2440 | static int |
2441 | zio_vdev_io_start(zio_t *zio) | |
2442 | { | |
2443 | vdev_t *vd = zio->io_vd; | |
34dc7c2f BB |
2444 | uint64_t align; |
2445 | spa_t *spa = zio->io_spa; | |
2446 | ||
b128c09f BB |
2447 | ASSERT(zio->io_error == 0); |
2448 | ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); | |
34dc7c2f | 2449 | |
b128c09f BB |
2450 | if (vd == NULL) { |
2451 | if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) | |
2452 | spa_config_enter(spa, SCL_ZIO, zio, RW_READER); | |
34dc7c2f | 2453 | |
b128c09f BB |
2454 | /* |
2455 | * The mirror_ops handle multiple DVAs in a single BP. | |
2456 | */ | |
2457 | return (vdev_mirror_ops.vdev_op_io_start(zio)); | |
34dc7c2f BB |
2458 | } |
2459 | ||
572e2857 BB |
2460 | /* |
2461 | * We keep track of time-sensitive I/Os so that the scan thread | |
2462 | * can quickly react to certain workloads. In particular, we care | |
2463 | * about non-scrubbing, top-level reads and writes with the following | |
2464 | * characteristics: | |
2465 | * - synchronous writes of user data to non-slog devices | |
2466 | * - any reads of user data | |
2467 | * When these conditions are met, adjust the timestamp of spa_last_io | |
2468 | * which allows the scan thread to adjust its workload accordingly. | |
2469 | */ | |
2470 | if (!(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && zio->io_bp != NULL && | |
2471 | vd == vd->vdev_top && !vd->vdev_islog && | |
2472 | zio->io_bookmark.zb_objset != DMU_META_OBJSET && | |
2473 | zio->io_txg != spa_syncing_txg(spa)) { | |
2474 | uint64_t old = spa->spa_last_io; | |
2475 | uint64_t new = ddi_get_lbolt64(); | |
2476 | if (old != new) | |
2477 | (void) atomic_cas_64(&spa->spa_last_io, old, new); | |
2478 | } | |
2479 | ||
b128c09f BB |
2480 | align = 1ULL << vd->vdev_top->vdev_ashift; |
2481 | ||
178e73b3 | 2482 | if (P2PHASE(zio->io_size, align) != 0) { |
34dc7c2f BB |
2483 | uint64_t asize = P2ROUNDUP(zio->io_size, align); |
2484 | char *abuf = zio_buf_alloc(asize); | |
178e73b3 | 2485 | ASSERT(vd == vd->vdev_top); |
34dc7c2f BB |
2486 | if (zio->io_type == ZIO_TYPE_WRITE) { |
2487 | bcopy(zio->io_data, abuf, zio->io_size); | |
2488 | bzero(abuf + zio->io_size, asize - zio->io_size); | |
2489 | } | |
b128c09f | 2490 | zio_push_transform(zio, abuf, asize, asize, zio_subblock); |
34dc7c2f BB |
2491 | } |
2492 | ||
2493 | ASSERT(P2PHASE(zio->io_offset, align) == 0); | |
178e73b3 | 2494 | ASSERT(P2PHASE(zio->io_size, align) == 0); |
572e2857 | 2495 | VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); |
fb5f0bc8 BB |
2496 | |
2497 | /* | |
2498 | * If this is a repair I/O, and there's no self-healing involved -- | |
2499 | * that is, we're just resilvering what we expect to resilver -- | |
2500 | * then don't do the I/O unless zio's txg is actually in vd's DTL. | |
2501 | * This prevents spurious resilvering with nested replication. | |
2502 | * For example, given a mirror of mirrors, (A+B)+(C+D), if only | |
2503 | * A is out of date, we'll read from C+D, then use the data to | |
2504 | * resilver A+B -- but we don't actually want to resilver B, just A. | |
2505 | * The top-level mirror has no way to know this, so instead we just | |
2506 | * discard unnecessary repairs as we work our way down the vdev tree. | |
2507 | * The same logic applies to any form of nested replication: | |
2508 | * ditto + mirror, RAID-Z + replacing, etc. This covers them all. | |
2509 | */ | |
2510 | if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && | |
2511 | !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && | |
2512 | zio->io_txg != 0 && /* not a delegated i/o */ | |
2513 | !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { | |
2514 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); | |
fb5f0bc8 BB |
2515 | zio_vdev_io_bypass(zio); |
2516 | return (ZIO_PIPELINE_CONTINUE); | |
2517 | } | |
34dc7c2f | 2518 | |
b128c09f BB |
2519 | if (vd->vdev_ops->vdev_op_leaf && |
2520 | (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { | |
2521 | ||
2522 | if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) | |
d164b209 | 2523 | return (ZIO_PIPELINE_CONTINUE); |
b128c09f BB |
2524 | |
2525 | if ((zio = vdev_queue_io(zio)) == NULL) | |
2526 | return (ZIO_PIPELINE_STOP); | |
2527 | ||
2528 | if (!vdev_accessible(vd, zio)) { | |
2529 | zio->io_error = ENXIO; | |
2530 | zio_interrupt(zio); | |
2531 | return (ZIO_PIPELINE_STOP); | |
2532 | } | |
b128c09f BB |
2533 | } |
2534 | ||
34dc7c2f BB |
2535 | return (vd->vdev_ops->vdev_op_io_start(zio)); |
2536 | } | |
2537 | ||
2538 | static int | |
2539 | zio_vdev_io_done(zio_t *zio) | |
2540 | { | |
b128c09f BB |
2541 | vdev_t *vd = zio->io_vd; |
2542 | vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; | |
2543 | boolean_t unexpected_error = B_FALSE; | |
34dc7c2f | 2544 | |
b128c09f BB |
2545 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) |
2546 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 2547 | |
b128c09f BB |
2548 | ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); |
2549 | ||
2550 | if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { | |
2551 | ||
2552 | vdev_queue_io_done(zio); | |
2553 | ||
2554 | if (zio->io_type == ZIO_TYPE_WRITE) | |
2555 | vdev_cache_write(zio); | |
2556 | ||
2557 | if (zio_injection_enabled && zio->io_error == 0) | |
9babb374 BB |
2558 | zio->io_error = zio_handle_device_injection(vd, |
2559 | zio, EIO); | |
b128c09f BB |
2560 | |
2561 | if (zio_injection_enabled && zio->io_error == 0) | |
2562 | zio->io_error = zio_handle_label_injection(zio, EIO); | |
2563 | ||
2564 | if (zio->io_error) { | |
2565 | if (!vdev_accessible(vd, zio)) { | |
2566 | zio->io_error = ENXIO; | |
2567 | } else { | |
2568 | unexpected_error = B_TRUE; | |
2569 | } | |
2570 | } | |
2571 | } | |
2572 | ||
2573 | ops->vdev_op_io_done(zio); | |
34dc7c2f | 2574 | |
b128c09f | 2575 | if (unexpected_error) |
d164b209 | 2576 | VERIFY(vdev_probe(vd, zio) == NULL); |
34dc7c2f | 2577 | |
b128c09f | 2578 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
2579 | } |
2580 | ||
428870ff BB |
2581 | /* |
2582 | * For non-raidz ZIOs, we can just copy aside the bad data read from the | |
2583 | * disk, and use that to finish the checksum ereport later. | |
2584 | */ | |
2585 | static void | |
2586 | zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, | |
2587 | const void *good_buf) | |
2588 | { | |
2589 | /* no processing needed */ | |
2590 | zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); | |
2591 | } | |
2592 | ||
2593 | /*ARGSUSED*/ | |
2594 | void | |
2595 | zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) | |
2596 | { | |
2597 | void *buf = zio_buf_alloc(zio->io_size); | |
2598 | ||
2599 | bcopy(zio->io_data, buf, zio->io_size); | |
2600 | ||
2601 | zcr->zcr_cbinfo = zio->io_size; | |
2602 | zcr->zcr_cbdata = buf; | |
2603 | zcr->zcr_finish = zio_vsd_default_cksum_finish; | |
2604 | zcr->zcr_free = zio_buf_free; | |
2605 | } | |
2606 | ||
34dc7c2f BB |
2607 | static int |
2608 | zio_vdev_io_assess(zio_t *zio) | |
2609 | { | |
2610 | vdev_t *vd = zio->io_vd; | |
b128c09f BB |
2611 | |
2612 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) | |
2613 | return (ZIO_PIPELINE_STOP); | |
2614 | ||
2615 | if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) | |
2616 | spa_config_exit(zio->io_spa, SCL_ZIO, zio); | |
2617 | ||
2618 | if (zio->io_vsd != NULL) { | |
428870ff | 2619 | zio->io_vsd_ops->vsd_free(zio); |
b128c09f | 2620 | zio->io_vsd = NULL; |
34dc7c2f BB |
2621 | } |
2622 | ||
b128c09f | 2623 | if (zio_injection_enabled && zio->io_error == 0) |
34dc7c2f BB |
2624 | zio->io_error = zio_handle_fault_injection(zio, EIO); |
2625 | ||
2626 | /* | |
2627 | * If the I/O failed, determine whether we should attempt to retry it. | |
428870ff BB |
2628 | * |
2629 | * On retry, we cut in line in the issue queue, since we don't want | |
2630 | * compression/checksumming/etc. work to prevent our (cheap) IO reissue. | |
34dc7c2f | 2631 | */ |
b128c09f BB |
2632 | if (zio->io_error && vd == NULL && |
2633 | !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { | |
2634 | ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ | |
2635 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ | |
34dc7c2f | 2636 | zio->io_error = 0; |
b128c09f BB |
2637 | zio->io_flags |= ZIO_FLAG_IO_RETRY | |
2638 | ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; | |
428870ff BB |
2639 | zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; |
2640 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, | |
2641 | zio_requeue_io_start_cut_in_line); | |
b128c09f | 2642 | return (ZIO_PIPELINE_STOP); |
34dc7c2f BB |
2643 | } |
2644 | ||
b128c09f BB |
2645 | /* |
2646 | * If we got an error on a leaf device, convert it to ENXIO | |
2647 | * if the device is not accessible at all. | |
2648 | */ | |
2649 | if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && | |
2650 | !vdev_accessible(vd, zio)) | |
2651 | zio->io_error = ENXIO; | |
2652 | ||
2653 | /* | |
2654 | * If we can't write to an interior vdev (mirror or RAID-Z), | |
2655 | * set vdev_cant_write so that we stop trying to allocate from it. | |
2656 | */ | |
2657 | if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && | |
2658 | vd != NULL && !vd->vdev_ops->vdev_op_leaf) | |
2659 | vd->vdev_cant_write = B_TRUE; | |
2660 | ||
2661 | if (zio->io_error) | |
2662 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
2663 | ||
34dc7c2f BB |
2664 | return (ZIO_PIPELINE_CONTINUE); |
2665 | } | |
2666 | ||
2667 | void | |
2668 | zio_vdev_io_reissue(zio_t *zio) | |
2669 | { | |
2670 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); | |
2671 | ASSERT(zio->io_error == 0); | |
2672 | ||
428870ff | 2673 | zio->io_stage >>= 1; |
34dc7c2f BB |
2674 | } |
2675 | ||
2676 | void | |
2677 | zio_vdev_io_redone(zio_t *zio) | |
2678 | { | |
2679 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); | |
2680 | ||
428870ff | 2681 | zio->io_stage >>= 1; |
34dc7c2f BB |
2682 | } |
2683 | ||
2684 | void | |
2685 | zio_vdev_io_bypass(zio_t *zio) | |
2686 | { | |
2687 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); | |
2688 | ASSERT(zio->io_error == 0); | |
2689 | ||
2690 | zio->io_flags |= ZIO_FLAG_IO_BYPASS; | |
428870ff | 2691 | zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; |
34dc7c2f BB |
2692 | } |
2693 | ||
2694 | /* | |
2695 | * ========================================================================== | |
2696 | * Generate and verify checksums | |
2697 | * ========================================================================== | |
2698 | */ | |
2699 | static int | |
2700 | zio_checksum_generate(zio_t *zio) | |
2701 | { | |
34dc7c2f | 2702 | blkptr_t *bp = zio->io_bp; |
b128c09f | 2703 | enum zio_checksum checksum; |
34dc7c2f | 2704 | |
b128c09f BB |
2705 | if (bp == NULL) { |
2706 | /* | |
2707 | * This is zio_write_phys(). | |
2708 | * We're either generating a label checksum, or none at all. | |
2709 | */ | |
2710 | checksum = zio->io_prop.zp_checksum; | |
34dc7c2f | 2711 | |
b128c09f BB |
2712 | if (checksum == ZIO_CHECKSUM_OFF) |
2713 | return (ZIO_PIPELINE_CONTINUE); | |
2714 | ||
2715 | ASSERT(checksum == ZIO_CHECKSUM_LABEL); | |
2716 | } else { | |
2717 | if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { | |
2718 | ASSERT(!IO_IS_ALLOCATING(zio)); | |
2719 | checksum = ZIO_CHECKSUM_GANG_HEADER; | |
2720 | } else { | |
2721 | checksum = BP_GET_CHECKSUM(bp); | |
2722 | } | |
2723 | } | |
34dc7c2f | 2724 | |
b128c09f | 2725 | zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); |
34dc7c2f BB |
2726 | |
2727 | return (ZIO_PIPELINE_CONTINUE); | |
2728 | } | |
2729 | ||
2730 | static int | |
b128c09f | 2731 | zio_checksum_verify(zio_t *zio) |
34dc7c2f | 2732 | { |
428870ff | 2733 | zio_bad_cksum_t info; |
b128c09f BB |
2734 | blkptr_t *bp = zio->io_bp; |
2735 | int error; | |
34dc7c2f | 2736 | |
428870ff BB |
2737 | ASSERT(zio->io_vd != NULL); |
2738 | ||
b128c09f BB |
2739 | if (bp == NULL) { |
2740 | /* | |
2741 | * This is zio_read_phys(). | |
2742 | * We're either verifying a label checksum, or nothing at all. | |
2743 | */ | |
2744 | if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) | |
2745 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f | 2746 | |
b128c09f BB |
2747 | ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); |
2748 | } | |
34dc7c2f | 2749 | |
428870ff | 2750 | if ((error = zio_checksum_error(zio, &info)) != 0) { |
b128c09f BB |
2751 | zio->io_error = error; |
2752 | if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { | |
428870ff BB |
2753 | zfs_ereport_start_checksum(zio->io_spa, |
2754 | zio->io_vd, zio, zio->io_offset, | |
2755 | zio->io_size, NULL, &info); | |
b128c09f | 2756 | } |
34dc7c2f BB |
2757 | } |
2758 | ||
2759 | return (ZIO_PIPELINE_CONTINUE); | |
2760 | } | |
2761 | ||
2762 | /* | |
2763 | * Called by RAID-Z to ensure we don't compute the checksum twice. | |
2764 | */ | |
2765 | void | |
2766 | zio_checksum_verified(zio_t *zio) | |
2767 | { | |
428870ff | 2768 | zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; |
34dc7c2f BB |
2769 | } |
2770 | ||
2771 | /* | |
b128c09f BB |
2772 | * ========================================================================== |
2773 | * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. | |
2774 | * An error of 0 indictes success. ENXIO indicates whole-device failure, | |
2775 | * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO | |
2776 | * indicate errors that are specific to one I/O, and most likely permanent. | |
2777 | * Any other error is presumed to be worse because we weren't expecting it. | |
2778 | * ========================================================================== | |
34dc7c2f | 2779 | */ |
b128c09f BB |
2780 | int |
2781 | zio_worst_error(int e1, int e2) | |
34dc7c2f | 2782 | { |
b128c09f BB |
2783 | static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; |
2784 | int r1, r2; | |
2785 | ||
2786 | for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) | |
2787 | if (e1 == zio_error_rank[r1]) | |
2788 | break; | |
34dc7c2f | 2789 | |
b128c09f BB |
2790 | for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) |
2791 | if (e2 == zio_error_rank[r2]) | |
2792 | break; | |
2793 | ||
2794 | return (r1 > r2 ? e1 : e2); | |
34dc7c2f BB |
2795 | } |
2796 | ||
2797 | /* | |
2798 | * ========================================================================== | |
b128c09f | 2799 | * I/O completion |
34dc7c2f BB |
2800 | * ========================================================================== |
2801 | */ | |
b128c09f BB |
2802 | static int |
2803 | zio_ready(zio_t *zio) | |
34dc7c2f | 2804 | { |
b128c09f | 2805 | blkptr_t *bp = zio->io_bp; |
d164b209 | 2806 | zio_t *pio, *pio_next; |
34dc7c2f | 2807 | |
428870ff BB |
2808 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || |
2809 | zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_READY)) | |
9babb374 | 2810 | return (ZIO_PIPELINE_STOP); |
34dc7c2f | 2811 | |
9babb374 | 2812 | if (zio->io_ready) { |
b128c09f BB |
2813 | ASSERT(IO_IS_ALLOCATING(zio)); |
2814 | ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); | |
2815 | ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); | |
34dc7c2f | 2816 | |
b128c09f BB |
2817 | zio->io_ready(zio); |
2818 | } | |
34dc7c2f | 2819 | |
b128c09f BB |
2820 | if (bp != NULL && bp != &zio->io_bp_copy) |
2821 | zio->io_bp_copy = *bp; | |
34dc7c2f | 2822 | |
b128c09f BB |
2823 | if (zio->io_error) |
2824 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
34dc7c2f | 2825 | |
d164b209 BB |
2826 | mutex_enter(&zio->io_lock); |
2827 | zio->io_state[ZIO_WAIT_READY] = 1; | |
2828 | pio = zio_walk_parents(zio); | |
2829 | mutex_exit(&zio->io_lock); | |
2830 | ||
2831 | /* | |
2832 | * As we notify zio's parents, new parents could be added. | |
2833 | * New parents go to the head of zio's io_parent_list, however, | |
2834 | * so we will (correctly) not notify them. The remainder of zio's | |
2835 | * io_parent_list, from 'pio_next' onward, cannot change because | |
2836 | * all parents must wait for us to be done before they can be done. | |
2837 | */ | |
2838 | for (; pio != NULL; pio = pio_next) { | |
2839 | pio_next = zio_walk_parents(zio); | |
b128c09f | 2840 | zio_notify_parent(pio, zio, ZIO_WAIT_READY); |
d164b209 | 2841 | } |
34dc7c2f | 2842 | |
428870ff BB |
2843 | if (zio->io_flags & ZIO_FLAG_NODATA) { |
2844 | if (BP_IS_GANG(bp)) { | |
2845 | zio->io_flags &= ~ZIO_FLAG_NODATA; | |
2846 | } else { | |
2847 | ASSERT((uintptr_t)zio->io_data < SPA_MAXBLOCKSIZE); | |
2848 | zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; | |
2849 | } | |
2850 | } | |
2851 | ||
2852 | if (zio_injection_enabled && | |
2853 | zio->io_spa->spa_syncing_txg == zio->io_txg) | |
2854 | zio_handle_ignored_writes(zio); | |
2855 | ||
b128c09f | 2856 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
2857 | } |
2858 | ||
b128c09f BB |
2859 | static int |
2860 | zio_done(zio_t *zio) | |
34dc7c2f | 2861 | { |
d164b209 | 2862 | zio_t *pio, *pio_next; |
d6320ddb | 2863 | int c, w; |
34dc7c2f | 2864 | |
b128c09f | 2865 | /* |
9babb374 | 2866 | * If our children haven't all completed, |
b128c09f BB |
2867 | * wait for them and then repeat this pipeline stage. |
2868 | */ | |
2869 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || | |
2870 | zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || | |
428870ff | 2871 | zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE) || |
b128c09f BB |
2872 | zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) |
2873 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 2874 | |
d6320ddb BB |
2875 | for (c = 0; c < ZIO_CHILD_TYPES; c++) |
2876 | for (w = 0; w < ZIO_WAIT_TYPES; w++) | |
b128c09f BB |
2877 | ASSERT(zio->io_children[c][w] == 0); |
2878 | ||
c776b317 BB |
2879 | if (zio->io_bp != NULL) { |
2880 | ASSERT(zio->io_bp->blk_pad[0] == 0); | |
2881 | ASSERT(zio->io_bp->blk_pad[1] == 0); | |
2882 | ASSERT(bcmp(zio->io_bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || | |
2883 | (zio->io_bp == zio_unique_parent(zio)->io_bp)); | |
2884 | if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(zio->io_bp) && | |
428870ff | 2885 | zio->io_bp_override == NULL && |
b128c09f | 2886 | !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { |
c776b317 BB |
2887 | ASSERT(!BP_SHOULD_BYTESWAP(zio->io_bp)); |
2888 | ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); | |
2889 | ASSERT(BP_COUNT_GANG(zio->io_bp) == 0 || | |
2890 | (BP_COUNT_GANG(zio->io_bp) == BP_GET_NDVAS(zio->io_bp))); | |
b128c09f BB |
2891 | } |
2892 | } | |
2893 | ||
2894 | /* | |
428870ff | 2895 | * If there were child vdev/gang/ddt errors, they apply to us now. |
b128c09f BB |
2896 | */ |
2897 | zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); | |
2898 | zio_inherit_child_errors(zio, ZIO_CHILD_GANG); | |
428870ff BB |
2899 | zio_inherit_child_errors(zio, ZIO_CHILD_DDT); |
2900 | ||
2901 | /* | |
2902 | * If the I/O on the transformed data was successful, generate any | |
2903 | * checksum reports now while we still have the transformed data. | |
2904 | */ | |
2905 | if (zio->io_error == 0) { | |
2906 | while (zio->io_cksum_report != NULL) { | |
2907 | zio_cksum_report_t *zcr = zio->io_cksum_report; | |
2908 | uint64_t align = zcr->zcr_align; | |
c776b317 | 2909 | uint64_t asize = P2ROUNDUP(zio->io_size, align); |
428870ff BB |
2910 | char *abuf = zio->io_data; |
2911 | ||
c776b317 | 2912 | if (asize != zio->io_size) { |
428870ff | 2913 | abuf = zio_buf_alloc(asize); |
c776b317 BB |
2914 | bcopy(zio->io_data, abuf, zio->io_size); |
2915 | bzero(abuf + zio->io_size, asize - zio->io_size); | |
428870ff BB |
2916 | } |
2917 | ||
2918 | zio->io_cksum_report = zcr->zcr_next; | |
2919 | zcr->zcr_next = NULL; | |
2920 | zcr->zcr_finish(zcr, abuf); | |
2921 | zfs_ereport_free_checksum(zcr); | |
2922 | ||
c776b317 | 2923 | if (asize != zio->io_size) |
428870ff BB |
2924 | zio_buf_free(abuf, asize); |
2925 | } | |
2926 | } | |
b128c09f BB |
2927 | |
2928 | zio_pop_transforms(zio); /* note: may set zio->io_error */ | |
2929 | ||
c776b317 | 2930 | vdev_stat_update(zio, zio->io_size); |
b128c09f | 2931 | |
a69052be | 2932 | /* |
cc92e9d0 | 2933 | * If this I/O is attached to a particular vdev is slow, exceeding |
72f53c56 MJ |
2934 | * 30 seconds to complete, post an error described the I/O delay. |
2935 | * We ignore these errors if the device is currently unavailable. | |
a69052be | 2936 | */ |
cc92e9d0 | 2937 | if (zio->io_delay >= MSEC_TO_TICK(zio_delay_max)) { |
72f53c56 MJ |
2938 | if (zio->io_vd != NULL && !vdev_is_dead(zio->io_vd)) |
2939 | zfs_ereport_post(FM_EREPORT_ZFS_DELAY, zio->io_spa, | |
2940 | zio->io_vd, zio, 0, 0); | |
2941 | } | |
a69052be | 2942 | |
b128c09f BB |
2943 | if (zio->io_error) { |
2944 | /* | |
2945 | * If this I/O is attached to a particular vdev, | |
2946 | * generate an error message describing the I/O failure | |
2947 | * at the block level. We ignore these errors if the | |
2948 | * device is currently unavailable. | |
2949 | */ | |
c776b317 BB |
2950 | if (zio->io_error != ECKSUM && zio->io_vd != NULL && |
2951 | !vdev_is_dead(zio->io_vd)) | |
2952 | zfs_ereport_post(FM_EREPORT_ZFS_IO, zio->io_spa, | |
2953 | zio->io_vd, zio, 0, 0); | |
34dc7c2f | 2954 | |
428870ff BB |
2955 | if ((zio->io_error == EIO || !(zio->io_flags & |
2956 | (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && | |
c776b317 | 2957 | zio == zio->io_logical) { |
b128c09f BB |
2958 | /* |
2959 | * For logical I/O requests, tell the SPA to log the | |
2960 | * error and generate a logical data ereport. | |
2961 | */ | |
c776b317 BB |
2962 | spa_log_error(zio->io_spa, zio); |
2963 | zfs_ereport_post(FM_EREPORT_ZFS_DATA, zio->io_spa, NULL, zio, | |
b128c09f BB |
2964 | 0, 0); |
2965 | } | |
2966 | } | |
34dc7c2f | 2967 | |
c776b317 | 2968 | if (zio->io_error && zio == zio->io_logical) { |
b128c09f BB |
2969 | /* |
2970 | * Determine whether zio should be reexecuted. This will | |
2971 | * propagate all the way to the root via zio_notify_parent(). | |
2972 | */ | |
c776b317 | 2973 | ASSERT(zio->io_vd == NULL && zio->io_bp != NULL); |
428870ff | 2974 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); |
b128c09f | 2975 | |
428870ff BB |
2976 | if (IO_IS_ALLOCATING(zio) && |
2977 | !(zio->io_flags & ZIO_FLAG_CANFAIL)) { | |
b128c09f BB |
2978 | if (zio->io_error != ENOSPC) |
2979 | zio->io_reexecute |= ZIO_REEXECUTE_NOW; | |
2980 | else | |
2981 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
428870ff | 2982 | } |
b128c09f BB |
2983 | |
2984 | if ((zio->io_type == ZIO_TYPE_READ || | |
2985 | zio->io_type == ZIO_TYPE_FREE) && | |
572e2857 | 2986 | !(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && |
b128c09f | 2987 | zio->io_error == ENXIO && |
c776b317 BB |
2988 | spa_load_state(zio->io_spa) == SPA_LOAD_NONE && |
2989 | spa_get_failmode(zio->io_spa) != ZIO_FAILURE_MODE_CONTINUE) | |
b128c09f BB |
2990 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; |
2991 | ||
2992 | if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) | |
2993 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
428870ff BB |
2994 | |
2995 | /* | |
2996 | * Here is a possibly good place to attempt to do | |
2997 | * either combinatorial reconstruction or error correction | |
2998 | * based on checksums. It also might be a good place | |
2999 | * to send out preliminary ereports before we suspend | |
3000 | * processing. | |
3001 | */ | |
34dc7c2f BB |
3002 | } |
3003 | ||
3004 | /* | |
b128c09f BB |
3005 | * If there were logical child errors, they apply to us now. |
3006 | * We defer this until now to avoid conflating logical child | |
3007 | * errors with errors that happened to the zio itself when | |
3008 | * updating vdev stats and reporting FMA events above. | |
34dc7c2f | 3009 | */ |
b128c09f | 3010 | zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); |
34dc7c2f | 3011 | |
428870ff BB |
3012 | if ((zio->io_error || zio->io_reexecute) && |
3013 | IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && | |
3014 | !(zio->io_flags & ZIO_FLAG_IO_REWRITE)) | |
c776b317 | 3015 | zio_dva_unallocate(zio, zio->io_gang_tree, zio->io_bp); |
9babb374 BB |
3016 | |
3017 | zio_gang_tree_free(&zio->io_gang_tree); | |
3018 | ||
3019 | /* | |
3020 | * Godfather I/Os should never suspend. | |
3021 | */ | |
3022 | if ((zio->io_flags & ZIO_FLAG_GODFATHER) && | |
3023 | (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) | |
3024 | zio->io_reexecute = 0; | |
3025 | ||
b128c09f BB |
3026 | if (zio->io_reexecute) { |
3027 | /* | |
3028 | * This is a logical I/O that wants to reexecute. | |
3029 | * | |
3030 | * Reexecute is top-down. When an i/o fails, if it's not | |
3031 | * the root, it simply notifies its parent and sticks around. | |
3032 | * The parent, seeing that it still has children in zio_done(), | |
3033 | * does the same. This percolates all the way up to the root. | |
3034 | * The root i/o will reexecute or suspend the entire tree. | |
3035 | * | |
3036 | * This approach ensures that zio_reexecute() honors | |
3037 | * all the original i/o dependency relationships, e.g. | |
3038 | * parents not executing until children are ready. | |
3039 | */ | |
3040 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
34dc7c2f | 3041 | |
9babb374 | 3042 | zio->io_gang_leader = NULL; |
b128c09f | 3043 | |
d164b209 BB |
3044 | mutex_enter(&zio->io_lock); |
3045 | zio->io_state[ZIO_WAIT_DONE] = 1; | |
3046 | mutex_exit(&zio->io_lock); | |
3047 | ||
9babb374 BB |
3048 | /* |
3049 | * "The Godfather" I/O monitors its children but is | |
3050 | * not a true parent to them. It will track them through | |
3051 | * the pipeline but severs its ties whenever they get into | |
3052 | * trouble (e.g. suspended). This allows "The Godfather" | |
3053 | * I/O to return status without blocking. | |
3054 | */ | |
3055 | for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { | |
3056 | zio_link_t *zl = zio->io_walk_link; | |
3057 | pio_next = zio_walk_parents(zio); | |
3058 | ||
3059 | if ((pio->io_flags & ZIO_FLAG_GODFATHER) && | |
3060 | (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { | |
3061 | zio_remove_child(pio, zio, zl); | |
3062 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); | |
3063 | } | |
3064 | } | |
3065 | ||
d164b209 | 3066 | if ((pio = zio_unique_parent(zio)) != NULL) { |
b128c09f BB |
3067 | /* |
3068 | * We're not a root i/o, so there's nothing to do | |
3069 | * but notify our parent. Don't propagate errors | |
3070 | * upward since we haven't permanently failed yet. | |
3071 | */ | |
9babb374 | 3072 | ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); |
b128c09f BB |
3073 | zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; |
3074 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); | |
3075 | } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { | |
3076 | /* | |
3077 | * We'd fail again if we reexecuted now, so suspend | |
3078 | * until conditions improve (e.g. device comes online). | |
3079 | */ | |
c776b317 | 3080 | zio_suspend(zio->io_spa, zio); |
b128c09f BB |
3081 | } else { |
3082 | /* | |
3083 | * Reexecution is potentially a huge amount of work. | |
3084 | * Hand it off to the otherwise-unused claim taskq. | |
3085 | */ | |
a38718a6 | 3086 | ASSERT(taskq_empty_ent(&zio->io_tqent)); |
7ef5e54e AL |
3087 | spa_taskq_dispatch_ent(zio->io_spa, |
3088 | ZIO_TYPE_CLAIM, ZIO_TASKQ_ISSUE, | |
a38718a6 GA |
3089 | (task_func_t *)zio_reexecute, zio, 0, |
3090 | &zio->io_tqent); | |
b128c09f BB |
3091 | } |
3092 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
3093 | } |
3094 | ||
428870ff | 3095 | ASSERT(zio->io_child_count == 0); |
b128c09f BB |
3096 | ASSERT(zio->io_reexecute == 0); |
3097 | ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); | |
34dc7c2f | 3098 | |
428870ff BB |
3099 | /* |
3100 | * Report any checksum errors, since the I/O is complete. | |
3101 | */ | |
3102 | while (zio->io_cksum_report != NULL) { | |
3103 | zio_cksum_report_t *zcr = zio->io_cksum_report; | |
3104 | zio->io_cksum_report = zcr->zcr_next; | |
3105 | zcr->zcr_next = NULL; | |
3106 | zcr->zcr_finish(zcr, NULL); | |
3107 | zfs_ereport_free_checksum(zcr); | |
3108 | } | |
3109 | ||
920dd524 ED |
3110 | if (zio->io_flags & ZIO_FLAG_FASTWRITE && zio->io_bp && |
3111 | !BP_IS_HOLE(zio->io_bp)) { | |
3112 | metaslab_fastwrite_unmark(zio->io_spa, zio->io_bp); | |
3113 | } | |
3114 | ||
d164b209 BB |
3115 | /* |
3116 | * It is the responsibility of the done callback to ensure that this | |
3117 | * particular zio is no longer discoverable for adoption, and as | |
3118 | * such, cannot acquire any new parents. | |
3119 | */ | |
b128c09f BB |
3120 | if (zio->io_done) |
3121 | zio->io_done(zio); | |
34dc7c2f | 3122 | |
d164b209 BB |
3123 | mutex_enter(&zio->io_lock); |
3124 | zio->io_state[ZIO_WAIT_DONE] = 1; | |
3125 | mutex_exit(&zio->io_lock); | |
34dc7c2f | 3126 | |
d164b209 BB |
3127 | for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { |
3128 | zio_link_t *zl = zio->io_walk_link; | |
3129 | pio_next = zio_walk_parents(zio); | |
3130 | zio_remove_child(pio, zio, zl); | |
b128c09f BB |
3131 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); |
3132 | } | |
34dc7c2f | 3133 | |
b128c09f BB |
3134 | if (zio->io_waiter != NULL) { |
3135 | mutex_enter(&zio->io_lock); | |
3136 | zio->io_executor = NULL; | |
3137 | cv_broadcast(&zio->io_cv); | |
3138 | mutex_exit(&zio->io_lock); | |
3139 | } else { | |
3140 | zio_destroy(zio); | |
3141 | } | |
34dc7c2f | 3142 | |
b128c09f | 3143 | return (ZIO_PIPELINE_STOP); |
34dc7c2f BB |
3144 | } |
3145 | ||
3146 | /* | |
b128c09f BB |
3147 | * ========================================================================== |
3148 | * I/O pipeline definition | |
3149 | * ========================================================================== | |
34dc7c2f | 3150 | */ |
428870ff | 3151 | static zio_pipe_stage_t *zio_pipeline[] = { |
b128c09f | 3152 | NULL, |
b128c09f | 3153 | zio_read_bp_init, |
428870ff BB |
3154 | zio_free_bp_init, |
3155 | zio_issue_async, | |
b128c09f BB |
3156 | zio_write_bp_init, |
3157 | zio_checksum_generate, | |
428870ff BB |
3158 | zio_ddt_read_start, |
3159 | zio_ddt_read_done, | |
3160 | zio_ddt_write, | |
3161 | zio_ddt_free, | |
b128c09f BB |
3162 | zio_gang_assemble, |
3163 | zio_gang_issue, | |
3164 | zio_dva_allocate, | |
3165 | zio_dva_free, | |
3166 | zio_dva_claim, | |
3167 | zio_ready, | |
3168 | zio_vdev_io_start, | |
3169 | zio_vdev_io_done, | |
3170 | zio_vdev_io_assess, | |
3171 | zio_checksum_verify, | |
3172 | zio_done | |
3173 | }; | |
c28b2279 | 3174 | |
9ae529ec CS |
3175 | /* dnp is the dnode for zb1->zb_object */ |
3176 | boolean_t | |
3177 | zbookmark_is_before(const dnode_phys_t *dnp, const zbookmark_t *zb1, | |
3178 | const zbookmark_t *zb2) | |
3179 | { | |
3180 | uint64_t zb1nextL0, zb2thisobj; | |
3181 | ||
3182 | ASSERT(zb1->zb_objset == zb2->zb_objset); | |
3183 | ASSERT(zb2->zb_level == 0); | |
3184 | ||
3185 | /* | |
3186 | * A bookmark in the deadlist is considered to be after | |
3187 | * everything else. | |
3188 | */ | |
3189 | if (zb2->zb_object == DMU_DEADLIST_OBJECT) | |
3190 | return (B_TRUE); | |
3191 | ||
3192 | /* The objset_phys_t isn't before anything. */ | |
3193 | if (dnp == NULL) | |
3194 | return (B_FALSE); | |
3195 | ||
3196 | zb1nextL0 = (zb1->zb_blkid + 1) << | |
3197 | ((zb1->zb_level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)); | |
3198 | ||
3199 | zb2thisobj = zb2->zb_object ? zb2->zb_object : | |
3200 | zb2->zb_blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT); | |
3201 | ||
3202 | if (zb1->zb_object == DMU_META_DNODE_OBJECT) { | |
3203 | uint64_t nextobj = zb1nextL0 * | |
3204 | (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT) >> DNODE_SHIFT; | |
3205 | return (nextobj <= zb2thisobj); | |
3206 | } | |
3207 | ||
3208 | if (zb1->zb_object < zb2thisobj) | |
3209 | return (B_TRUE); | |
3210 | if (zb1->zb_object > zb2thisobj) | |
3211 | return (B_FALSE); | |
3212 | if (zb2->zb_object == DMU_META_DNODE_OBJECT) | |
3213 | return (B_FALSE); | |
3214 | return (zb1nextL0 <= zb2->zb_blkid); | |
3215 | } | |
3216 | ||
c28b2279 BB |
3217 | #if defined(_KERNEL) && defined(HAVE_SPL) |
3218 | /* Fault injection */ | |
3219 | EXPORT_SYMBOL(zio_injection_enabled); | |
3220 | EXPORT_SYMBOL(zio_inject_fault); | |
3221 | EXPORT_SYMBOL(zio_inject_list_next); | |
3222 | EXPORT_SYMBOL(zio_clear_fault); | |
3223 | EXPORT_SYMBOL(zio_handle_fault_injection); | |
3224 | EXPORT_SYMBOL(zio_handle_device_injection); | |
3225 | EXPORT_SYMBOL(zio_handle_label_injection); | |
3226 | EXPORT_SYMBOL(zio_priority_table); | |
3227 | EXPORT_SYMBOL(zio_type_name); | |
3228 | ||
3229 | module_param(zio_bulk_flags, int, 0644); | |
3230 | MODULE_PARM_DESC(zio_bulk_flags, "Additional flags to pass to bulk buffers"); | |
a69052be BB |
3231 | |
3232 | module_param(zio_delay_max, int, 0644); | |
c409e464 BB |
3233 | MODULE_PARM_DESC(zio_delay_max, "Max zio millisec delay before posting event"); |
3234 | ||
3235 | module_param(zio_requeue_io_start_cut_in_line, int, 0644); | |
3236 | MODULE_PARM_DESC(zio_requeue_io_start_cut_in_line, "Prioritize requeued I/O"); | |
c28b2279 | 3237 | #endif |