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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. |
c3520e7f | 23 | * Copyright (c) 2011, 2015 by Delphix. All rights reserved. |
a38718a6 | 24 | * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved. |
34dc7c2f BB |
25 | */ |
26 | ||
f1512ee6 | 27 | #include <sys/sysmacros.h> |
34dc7c2f BB |
28 | #include <sys/zfs_context.h> |
29 | #include <sys/fm/fs/zfs.h> | |
30 | #include <sys/spa.h> | |
31 | #include <sys/txg.h> | |
32 | #include <sys/spa_impl.h> | |
33 | #include <sys/vdev_impl.h> | |
34 | #include <sys/zio_impl.h> | |
35 | #include <sys/zio_compress.h> | |
36 | #include <sys/zio_checksum.h> | |
428870ff BB |
37 | #include <sys/dmu_objset.h> |
38 | #include <sys/arc.h> | |
39 | #include <sys/ddt.h> | |
9b67f605 | 40 | #include <sys/blkptr.h> |
b0bc7a84 | 41 | #include <sys/zfeature.h> |
34dc7c2f | 42 | |
34dc7c2f BB |
43 | /* |
44 | * ========================================================================== | |
45 | * I/O type descriptions | |
46 | * ========================================================================== | |
47 | */ | |
e8b96c60 | 48 | const char *zio_type_name[ZIO_TYPES] = { |
451041db | 49 | "z_null", "z_rd", "z_wr", "z_fr", "z_cl", "z_ioctl" |
428870ff | 50 | }; |
34dc7c2f BB |
51 | |
52 | /* | |
53 | * ========================================================================== | |
54 | * I/O kmem caches | |
55 | * ========================================================================== | |
56 | */ | |
57 | kmem_cache_t *zio_cache; | |
d164b209 | 58 | kmem_cache_t *zio_link_cache; |
34dc7c2f BB |
59 | kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; |
60 | kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; | |
a69052be | 61 | int zio_delay_max = ZIO_DELAY_MAX; |
34dc7c2f | 62 | |
98b25418 GW |
63 | #define ZIO_PIPELINE_CONTINUE 0x100 |
64 | #define ZIO_PIPELINE_STOP 0x101 | |
65 | ||
55d85d5a GW |
66 | /* |
67 | * The following actions directly effect the spa's sync-to-convergence logic. | |
68 | * The values below define the sync pass when we start performing the action. | |
69 | * Care should be taken when changing these values as they directly impact | |
70 | * spa_sync() performance. Tuning these values may introduce subtle performance | |
71 | * pathologies and should only be done in the context of performance analysis. | |
72 | * These tunables will eventually be removed and replaced with #defines once | |
73 | * enough analysis has been done to determine optimal values. | |
74 | * | |
75 | * The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that | |
76 | * regular blocks are not deferred. | |
77 | */ | |
78 | int zfs_sync_pass_deferred_free = 2; /* defer frees starting in this pass */ | |
79 | int zfs_sync_pass_dont_compress = 5; /* don't compress starting in this pass */ | |
80 | int zfs_sync_pass_rewrite = 2; /* rewrite new bps starting in this pass */ | |
81 | ||
34dc7c2f | 82 | /* |
b128c09f BB |
83 | * An allocating zio is one that either currently has the DVA allocate |
84 | * stage set or will have it later in its lifetime. | |
34dc7c2f | 85 | */ |
428870ff BB |
86 | #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) |
87 | ||
c409e464 | 88 | int zio_requeue_io_start_cut_in_line = 1; |
428870ff BB |
89 | |
90 | #ifdef ZFS_DEBUG | |
91 | int zio_buf_debug_limit = 16384; | |
92 | #else | |
93 | int zio_buf_debug_limit = 0; | |
94 | #endif | |
34dc7c2f | 95 | |
da6b4005 NB |
96 | static inline void __zio_execute(zio_t *zio); |
97 | ||
34dc7c2f BB |
98 | void |
99 | zio_init(void) | |
100 | { | |
101 | size_t c; | |
102 | vmem_t *data_alloc_arena = NULL; | |
103 | ||
3941503c BB |
104 | zio_cache = kmem_cache_create("zio_cache", |
105 | sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); | |
d164b209 | 106 | zio_link_cache = kmem_cache_create("zio_link_cache", |
6795a698 | 107 | sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); |
34dc7c2f BB |
108 | |
109 | /* | |
110 | * For small buffers, we want a cache for each multiple of | |
f1512ee6 MA |
111 | * SPA_MINBLOCKSIZE. For larger buffers, we want a cache |
112 | * for each quarter-power of 2. | |
34dc7c2f BB |
113 | */ |
114 | for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { | |
115 | size_t size = (c + 1) << SPA_MINBLOCKSHIFT; | |
116 | size_t p2 = size; | |
117 | size_t align = 0; | |
6442f3cf | 118 | size_t cflags = (size > zio_buf_debug_limit) ? KMC_NODEBUG : 0; |
34dc7c2f | 119 | |
f1512ee6 MA |
120 | #ifdef _ILP32 |
121 | /* | |
122 | * Cache size limited to 1M on 32-bit platforms until ARC | |
123 | * buffers no longer require virtual address space. | |
124 | */ | |
125 | if (size > zfs_max_recordsize) | |
126 | break; | |
127 | #endif | |
128 | ||
129 | while (!ISP2(p2)) | |
34dc7c2f BB |
130 | p2 &= p2 - 1; |
131 | ||
498877ba MA |
132 | #ifndef _KERNEL |
133 | /* | |
134 | * If we are using watchpoints, put each buffer on its own page, | |
135 | * to eliminate the performance overhead of trapping to the | |
136 | * kernel when modifying a non-watched buffer that shares the | |
137 | * page with a watched buffer. | |
138 | */ | |
139 | if (arc_watch && !IS_P2ALIGNED(size, PAGESIZE)) | |
140 | continue; | |
141 | #endif | |
34dc7c2f BB |
142 | if (size <= 4 * SPA_MINBLOCKSIZE) { |
143 | align = SPA_MINBLOCKSIZE; | |
498877ba | 144 | } else if (IS_P2ALIGNED(size, p2 >> 2)) { |
f1512ee6 | 145 | align = MIN(p2 >> 2, PAGESIZE); |
34dc7c2f BB |
146 | } |
147 | ||
148 | if (align != 0) { | |
149 | char name[36]; | |
150 | (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); | |
151 | zio_buf_cache[c] = kmem_cache_create(name, size, | |
6442f3cf | 152 | align, NULL, NULL, NULL, NULL, NULL, cflags); |
34dc7c2f BB |
153 | |
154 | (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); | |
155 | zio_data_buf_cache[c] = kmem_cache_create(name, size, | |
ae6ba3db | 156 | align, NULL, NULL, NULL, NULL, |
6442f3cf | 157 | data_alloc_arena, cflags); |
34dc7c2f BB |
158 | } |
159 | } | |
160 | ||
161 | while (--c != 0) { | |
162 | ASSERT(zio_buf_cache[c] != NULL); | |
163 | if (zio_buf_cache[c - 1] == NULL) | |
164 | zio_buf_cache[c - 1] = zio_buf_cache[c]; | |
165 | ||
166 | ASSERT(zio_data_buf_cache[c] != NULL); | |
167 | if (zio_data_buf_cache[c - 1] == NULL) | |
168 | zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; | |
169 | } | |
170 | ||
34dc7c2f | 171 | zio_inject_init(); |
9759c60f ED |
172 | |
173 | lz4_init(); | |
34dc7c2f BB |
174 | } |
175 | ||
176 | void | |
177 | zio_fini(void) | |
178 | { | |
179 | size_t c; | |
180 | kmem_cache_t *last_cache = NULL; | |
181 | kmem_cache_t *last_data_cache = NULL; | |
182 | ||
183 | for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { | |
f1512ee6 MA |
184 | #ifdef _ILP32 |
185 | /* | |
186 | * Cache size limited to 1M on 32-bit platforms until ARC | |
187 | * buffers no longer require virtual address space. | |
188 | */ | |
189 | if (((c + 1) << SPA_MINBLOCKSHIFT) > zfs_max_recordsize) | |
190 | break; | |
191 | #endif | |
34dc7c2f BB |
192 | if (zio_buf_cache[c] != last_cache) { |
193 | last_cache = zio_buf_cache[c]; | |
194 | kmem_cache_destroy(zio_buf_cache[c]); | |
195 | } | |
196 | zio_buf_cache[c] = NULL; | |
197 | ||
198 | if (zio_data_buf_cache[c] != last_data_cache) { | |
199 | last_data_cache = zio_data_buf_cache[c]; | |
200 | kmem_cache_destroy(zio_data_buf_cache[c]); | |
201 | } | |
202 | zio_data_buf_cache[c] = NULL; | |
203 | } | |
204 | ||
d164b209 | 205 | kmem_cache_destroy(zio_link_cache); |
34dc7c2f BB |
206 | kmem_cache_destroy(zio_cache); |
207 | ||
208 | zio_inject_fini(); | |
9759c60f ED |
209 | |
210 | lz4_fini(); | |
34dc7c2f BB |
211 | } |
212 | ||
213 | /* | |
214 | * ========================================================================== | |
215 | * Allocate and free I/O buffers | |
216 | * ========================================================================== | |
217 | */ | |
218 | ||
219 | /* | |
220 | * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a | |
221 | * crashdump if the kernel panics, so use it judiciously. Obviously, it's | |
222 | * useful to inspect ZFS metadata, but if possible, we should avoid keeping | |
223 | * excess / transient data in-core during a crashdump. | |
224 | */ | |
225 | void * | |
226 | zio_buf_alloc(size_t size) | |
227 | { | |
228 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
229 | ||
63e3a861 | 230 | VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); |
34dc7c2f | 231 | |
efcd79a8 | 232 | return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); |
34dc7c2f BB |
233 | } |
234 | ||
235 | /* | |
236 | * Use zio_data_buf_alloc to allocate data. The data will not appear in a | |
237 | * crashdump if the kernel panics. This exists so that we will limit the amount | |
238 | * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount | |
239 | * of kernel heap dumped to disk when the kernel panics) | |
240 | */ | |
241 | void * | |
242 | zio_data_buf_alloc(size_t size) | |
243 | { | |
244 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
245 | ||
63e3a861 | 246 | VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); |
34dc7c2f | 247 | |
efcd79a8 | 248 | return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); |
34dc7c2f BB |
249 | } |
250 | ||
251 | void | |
252 | zio_buf_free(void *buf, size_t size) | |
253 | { | |
254 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
255 | ||
63e3a861 | 256 | VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); |
34dc7c2f BB |
257 | |
258 | kmem_cache_free(zio_buf_cache[c], buf); | |
259 | } | |
260 | ||
261 | void | |
262 | zio_data_buf_free(void *buf, size_t size) | |
263 | { | |
264 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
265 | ||
63e3a861 | 266 | VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); |
34dc7c2f BB |
267 | |
268 | kmem_cache_free(zio_data_buf_cache[c], buf); | |
269 | } | |
270 | ||
271 | /* | |
272 | * ========================================================================== | |
273 | * Push and pop I/O transform buffers | |
274 | * ========================================================================== | |
275 | */ | |
276 | static void | |
b128c09f BB |
277 | zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, |
278 | zio_transform_func_t *transform) | |
34dc7c2f | 279 | { |
79c76d5b | 280 | zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); |
34dc7c2f | 281 | |
b128c09f BB |
282 | zt->zt_orig_data = zio->io_data; |
283 | zt->zt_orig_size = zio->io_size; | |
34dc7c2f | 284 | zt->zt_bufsize = bufsize; |
b128c09f | 285 | zt->zt_transform = transform; |
34dc7c2f BB |
286 | |
287 | zt->zt_next = zio->io_transform_stack; | |
288 | zio->io_transform_stack = zt; | |
289 | ||
290 | zio->io_data = data; | |
291 | zio->io_size = size; | |
292 | } | |
293 | ||
294 | static void | |
b128c09f | 295 | zio_pop_transforms(zio_t *zio) |
34dc7c2f | 296 | { |
b128c09f BB |
297 | zio_transform_t *zt; |
298 | ||
299 | while ((zt = zio->io_transform_stack) != NULL) { | |
300 | if (zt->zt_transform != NULL) | |
301 | zt->zt_transform(zio, | |
302 | zt->zt_orig_data, zt->zt_orig_size); | |
34dc7c2f | 303 | |
428870ff BB |
304 | if (zt->zt_bufsize != 0) |
305 | zio_buf_free(zio->io_data, zt->zt_bufsize); | |
34dc7c2f | 306 | |
b128c09f BB |
307 | zio->io_data = zt->zt_orig_data; |
308 | zio->io_size = zt->zt_orig_size; | |
309 | zio->io_transform_stack = zt->zt_next; | |
34dc7c2f | 310 | |
b128c09f | 311 | kmem_free(zt, sizeof (zio_transform_t)); |
34dc7c2f BB |
312 | } |
313 | } | |
314 | ||
b128c09f BB |
315 | /* |
316 | * ========================================================================== | |
317 | * I/O transform callbacks for subblocks and decompression | |
318 | * ========================================================================== | |
319 | */ | |
320 | static void | |
321 | zio_subblock(zio_t *zio, void *data, uint64_t size) | |
322 | { | |
323 | ASSERT(zio->io_size > size); | |
324 | ||
325 | if (zio->io_type == ZIO_TYPE_READ) | |
326 | bcopy(zio->io_data, data, size); | |
327 | } | |
328 | ||
329 | static void | |
330 | zio_decompress(zio_t *zio, void *data, uint64_t size) | |
331 | { | |
332 | if (zio->io_error == 0 && | |
333 | zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), | |
428870ff | 334 | zio->io_data, data, zio->io_size, size) != 0) |
2e528b49 | 335 | zio->io_error = SET_ERROR(EIO); |
b128c09f BB |
336 | } |
337 | ||
338 | /* | |
339 | * ========================================================================== | |
340 | * I/O parent/child relationships and pipeline interlocks | |
341 | * ========================================================================== | |
342 | */ | |
d164b209 BB |
343 | /* |
344 | * NOTE - Callers to zio_walk_parents() and zio_walk_children must | |
345 | * continue calling these functions until they return NULL. | |
346 | * Otherwise, the next caller will pick up the list walk in | |
347 | * some indeterminate state. (Otherwise every caller would | |
348 | * have to pass in a cookie to keep the state represented by | |
349 | * io_walk_link, which gets annoying.) | |
350 | */ | |
351 | zio_t * | |
352 | zio_walk_parents(zio_t *cio) | |
353 | { | |
354 | zio_link_t *zl = cio->io_walk_link; | |
355 | list_t *pl = &cio->io_parent_list; | |
b128c09f | 356 | |
d164b209 BB |
357 | zl = (zl == NULL) ? list_head(pl) : list_next(pl, zl); |
358 | cio->io_walk_link = zl; | |
359 | ||
360 | if (zl == NULL) | |
361 | return (NULL); | |
362 | ||
363 | ASSERT(zl->zl_child == cio); | |
364 | return (zl->zl_parent); | |
365 | } | |
366 | ||
367 | zio_t * | |
368 | zio_walk_children(zio_t *pio) | |
369 | { | |
370 | zio_link_t *zl = pio->io_walk_link; | |
371 | list_t *cl = &pio->io_child_list; | |
372 | ||
373 | zl = (zl == NULL) ? list_head(cl) : list_next(cl, zl); | |
374 | pio->io_walk_link = zl; | |
375 | ||
376 | if (zl == NULL) | |
377 | return (NULL); | |
378 | ||
379 | ASSERT(zl->zl_parent == pio); | |
380 | return (zl->zl_child); | |
381 | } | |
382 | ||
383 | zio_t * | |
384 | zio_unique_parent(zio_t *cio) | |
385 | { | |
386 | zio_t *pio = zio_walk_parents(cio); | |
387 | ||
388 | VERIFY(zio_walk_parents(cio) == NULL); | |
389 | return (pio); | |
390 | } | |
391 | ||
392 | void | |
393 | zio_add_child(zio_t *pio, zio_t *cio) | |
b128c09f | 394 | { |
79c76d5b | 395 | zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); |
d6320ddb | 396 | int w; |
d164b209 BB |
397 | |
398 | /* | |
399 | * Logical I/Os can have logical, gang, or vdev children. | |
400 | * Gang I/Os can have gang or vdev children. | |
401 | * Vdev I/Os can only have vdev children. | |
402 | * The following ASSERT captures all of these constraints. | |
403 | */ | |
404 | ASSERT(cio->io_child_type <= pio->io_child_type); | |
405 | ||
406 | zl->zl_parent = pio; | |
407 | zl->zl_child = cio; | |
408 | ||
409 | mutex_enter(&cio->io_lock); | |
b128c09f | 410 | mutex_enter(&pio->io_lock); |
d164b209 BB |
411 | |
412 | ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); | |
413 | ||
d6320ddb | 414 | for (w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 BB |
415 | pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; |
416 | ||
417 | list_insert_head(&pio->io_child_list, zl); | |
418 | list_insert_head(&cio->io_parent_list, zl); | |
419 | ||
428870ff BB |
420 | pio->io_child_count++; |
421 | cio->io_parent_count++; | |
422 | ||
b128c09f | 423 | mutex_exit(&pio->io_lock); |
d164b209 | 424 | mutex_exit(&cio->io_lock); |
b128c09f BB |
425 | } |
426 | ||
34dc7c2f | 427 | static void |
d164b209 | 428 | zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) |
b128c09f | 429 | { |
d164b209 BB |
430 | ASSERT(zl->zl_parent == pio); |
431 | ASSERT(zl->zl_child == cio); | |
b128c09f | 432 | |
d164b209 | 433 | mutex_enter(&cio->io_lock); |
b128c09f | 434 | mutex_enter(&pio->io_lock); |
d164b209 BB |
435 | |
436 | list_remove(&pio->io_child_list, zl); | |
437 | list_remove(&cio->io_parent_list, zl); | |
438 | ||
428870ff BB |
439 | pio->io_child_count--; |
440 | cio->io_parent_count--; | |
441 | ||
b128c09f | 442 | mutex_exit(&pio->io_lock); |
d164b209 BB |
443 | mutex_exit(&cio->io_lock); |
444 | ||
445 | kmem_cache_free(zio_link_cache, zl); | |
b128c09f BB |
446 | } |
447 | ||
448 | static boolean_t | |
449 | zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) | |
34dc7c2f | 450 | { |
b128c09f BB |
451 | uint64_t *countp = &zio->io_children[child][wait]; |
452 | boolean_t waiting = B_FALSE; | |
453 | ||
454 | mutex_enter(&zio->io_lock); | |
455 | ASSERT(zio->io_stall == NULL); | |
456 | if (*countp != 0) { | |
428870ff | 457 | zio->io_stage >>= 1; |
b128c09f BB |
458 | zio->io_stall = countp; |
459 | waiting = B_TRUE; | |
460 | } | |
461 | mutex_exit(&zio->io_lock); | |
462 | ||
463 | return (waiting); | |
464 | } | |
34dc7c2f | 465 | |
bf701a83 BB |
466 | __attribute__((always_inline)) |
467 | static inline void | |
b128c09f BB |
468 | zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) |
469 | { | |
470 | uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; | |
471 | int *errorp = &pio->io_child_error[zio->io_child_type]; | |
34dc7c2f | 472 | |
b128c09f BB |
473 | mutex_enter(&pio->io_lock); |
474 | if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) | |
475 | *errorp = zio_worst_error(*errorp, zio->io_error); | |
476 | pio->io_reexecute |= zio->io_reexecute; | |
477 | ASSERT3U(*countp, >, 0); | |
e8b96c60 MA |
478 | |
479 | (*countp)--; | |
480 | ||
481 | if (*countp == 0 && pio->io_stall == countp) { | |
b128c09f BB |
482 | pio->io_stall = NULL; |
483 | mutex_exit(&pio->io_lock); | |
da6b4005 | 484 | __zio_execute(pio); |
b128c09f BB |
485 | } else { |
486 | mutex_exit(&pio->io_lock); | |
34dc7c2f BB |
487 | } |
488 | } | |
489 | ||
b128c09f BB |
490 | static void |
491 | zio_inherit_child_errors(zio_t *zio, enum zio_child c) | |
492 | { | |
493 | if (zio->io_child_error[c] != 0 && zio->io_error == 0) | |
494 | zio->io_error = zio->io_child_error[c]; | |
495 | } | |
496 | ||
34dc7c2f BB |
497 | /* |
498 | * ========================================================================== | |
b128c09f | 499 | * Create the various types of I/O (read, write, free, etc) |
34dc7c2f BB |
500 | * ========================================================================== |
501 | */ | |
502 | static zio_t * | |
428870ff | 503 | zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
34dc7c2f | 504 | void *data, uint64_t size, zio_done_func_t *done, void *private, |
e8b96c60 | 505 | zio_type_t type, zio_priority_t priority, enum zio_flag flags, |
5dbd68a3 | 506 | vdev_t *vd, uint64_t offset, const zbookmark_phys_t *zb, |
428870ff | 507 | enum zio_stage stage, enum zio_stage pipeline) |
34dc7c2f BB |
508 | { |
509 | zio_t *zio; | |
510 | ||
511 | ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); | |
512 | ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); | |
b128c09f BB |
513 | ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); |
514 | ||
515 | ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); | |
516 | ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); | |
517 | ASSERT(vd || stage == ZIO_STAGE_OPEN); | |
34dc7c2f | 518 | |
79c76d5b | 519 | zio = kmem_cache_alloc(zio_cache, KM_SLEEP); |
3941503c BB |
520 | bzero(zio, sizeof (zio_t)); |
521 | ||
522 | mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); | |
523 | cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); | |
524 | ||
525 | list_create(&zio->io_parent_list, sizeof (zio_link_t), | |
526 | offsetof(zio_link_t, zl_parent_node)); | |
527 | list_create(&zio->io_child_list, sizeof (zio_link_t), | |
528 | offsetof(zio_link_t, zl_child_node)); | |
d164b209 | 529 | |
b128c09f BB |
530 | if (vd != NULL) |
531 | zio->io_child_type = ZIO_CHILD_VDEV; | |
532 | else if (flags & ZIO_FLAG_GANG_CHILD) | |
533 | zio->io_child_type = ZIO_CHILD_GANG; | |
428870ff BB |
534 | else if (flags & ZIO_FLAG_DDT_CHILD) |
535 | zio->io_child_type = ZIO_CHILD_DDT; | |
b128c09f BB |
536 | else |
537 | zio->io_child_type = ZIO_CHILD_LOGICAL; | |
538 | ||
34dc7c2f | 539 | if (bp != NULL) { |
428870ff | 540 | zio->io_bp = (blkptr_t *)bp; |
34dc7c2f BB |
541 | zio->io_bp_copy = *bp; |
542 | zio->io_bp_orig = *bp; | |
428870ff BB |
543 | if (type != ZIO_TYPE_WRITE || |
544 | zio->io_child_type == ZIO_CHILD_DDT) | |
b128c09f | 545 | zio->io_bp = &zio->io_bp_copy; /* so caller can free */ |
9babb374 | 546 | if (zio->io_child_type == ZIO_CHILD_LOGICAL) |
b128c09f | 547 | zio->io_logical = zio; |
9babb374 BB |
548 | if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) |
549 | pipeline |= ZIO_GANG_STAGES; | |
34dc7c2f | 550 | } |
b128c09f BB |
551 | |
552 | zio->io_spa = spa; | |
553 | zio->io_txg = txg; | |
34dc7c2f BB |
554 | zio->io_done = done; |
555 | zio->io_private = private; | |
556 | zio->io_type = type; | |
557 | zio->io_priority = priority; | |
b128c09f BB |
558 | zio->io_vd = vd; |
559 | zio->io_offset = offset; | |
428870ff BB |
560 | zio->io_orig_data = zio->io_data = data; |
561 | zio->io_orig_size = zio->io_size = size; | |
b128c09f BB |
562 | zio->io_orig_flags = zio->io_flags = flags; |
563 | zio->io_orig_stage = zio->io_stage = stage; | |
564 | zio->io_orig_pipeline = zio->io_pipeline = pipeline; | |
34dc7c2f | 565 | |
d164b209 BB |
566 | zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); |
567 | zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); | |
568 | ||
b128c09f BB |
569 | if (zb != NULL) |
570 | zio->io_bookmark = *zb; | |
571 | ||
572 | if (pio != NULL) { | |
b128c09f | 573 | if (zio->io_logical == NULL) |
34dc7c2f | 574 | zio->io_logical = pio->io_logical; |
9babb374 BB |
575 | if (zio->io_child_type == ZIO_CHILD_GANG) |
576 | zio->io_gang_leader = pio->io_gang_leader; | |
b128c09f | 577 | zio_add_child(pio, zio); |
34dc7c2f BB |
578 | } |
579 | ||
a38718a6 GA |
580 | taskq_init_ent(&zio->io_tqent); |
581 | ||
34dc7c2f BB |
582 | return (zio); |
583 | } | |
584 | ||
585 | static void | |
b128c09f | 586 | zio_destroy(zio_t *zio) |
34dc7c2f | 587 | { |
3941503c BB |
588 | list_destroy(&zio->io_parent_list); |
589 | list_destroy(&zio->io_child_list); | |
590 | mutex_destroy(&zio->io_lock); | |
591 | cv_destroy(&zio->io_cv); | |
b128c09f | 592 | kmem_cache_free(zio_cache, zio); |
34dc7c2f BB |
593 | } |
594 | ||
595 | zio_t * | |
d164b209 | 596 | zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, |
428870ff | 597 | void *private, enum zio_flag flags) |
34dc7c2f BB |
598 | { |
599 | zio_t *zio; | |
600 | ||
601 | zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, | |
d164b209 | 602 | ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, |
b128c09f | 603 | ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); |
34dc7c2f BB |
604 | |
605 | return (zio); | |
606 | } | |
607 | ||
608 | zio_t * | |
428870ff | 609 | zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) |
34dc7c2f | 610 | { |
d164b209 | 611 | return (zio_null(NULL, spa, NULL, done, private, flags)); |
34dc7c2f BB |
612 | } |
613 | ||
63e3a861 MA |
614 | void |
615 | zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp) | |
616 | { | |
617 | int i; | |
618 | ||
619 | if (!DMU_OT_IS_VALID(BP_GET_TYPE(bp))) { | |
620 | zfs_panic_recover("blkptr at %p has invalid TYPE %llu", | |
621 | bp, (longlong_t)BP_GET_TYPE(bp)); | |
622 | } | |
623 | if (BP_GET_CHECKSUM(bp) >= ZIO_CHECKSUM_FUNCTIONS || | |
624 | BP_GET_CHECKSUM(bp) <= ZIO_CHECKSUM_ON) { | |
625 | zfs_panic_recover("blkptr at %p has invalid CHECKSUM %llu", | |
626 | bp, (longlong_t)BP_GET_CHECKSUM(bp)); | |
627 | } | |
628 | if (BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_FUNCTIONS || | |
629 | BP_GET_COMPRESS(bp) <= ZIO_COMPRESS_ON) { | |
630 | zfs_panic_recover("blkptr at %p has invalid COMPRESS %llu", | |
631 | bp, (longlong_t)BP_GET_COMPRESS(bp)); | |
632 | } | |
633 | if (BP_GET_LSIZE(bp) > SPA_MAXBLOCKSIZE) { | |
634 | zfs_panic_recover("blkptr at %p has invalid LSIZE %llu", | |
635 | bp, (longlong_t)BP_GET_LSIZE(bp)); | |
636 | } | |
637 | if (BP_GET_PSIZE(bp) > SPA_MAXBLOCKSIZE) { | |
638 | zfs_panic_recover("blkptr at %p has invalid PSIZE %llu", | |
639 | bp, (longlong_t)BP_GET_PSIZE(bp)); | |
640 | } | |
641 | ||
642 | if (BP_IS_EMBEDDED(bp)) { | |
643 | if (BPE_GET_ETYPE(bp) > NUM_BP_EMBEDDED_TYPES) { | |
644 | zfs_panic_recover("blkptr at %p has invalid ETYPE %llu", | |
645 | bp, (longlong_t)BPE_GET_ETYPE(bp)); | |
646 | } | |
647 | } | |
648 | ||
649 | /* | |
650 | * Pool-specific checks. | |
651 | * | |
652 | * Note: it would be nice to verify that the blk_birth and | |
653 | * BP_PHYSICAL_BIRTH() are not too large. However, spa_freeze() | |
654 | * allows the birth time of log blocks (and dmu_sync()-ed blocks | |
655 | * that are in the log) to be arbitrarily large. | |
656 | */ | |
657 | for (i = 0; i < BP_GET_NDVAS(bp); i++) { | |
658 | uint64_t vdevid = DVA_GET_VDEV(&bp->blk_dva[i]); | |
659 | vdev_t *vd; | |
660 | uint64_t offset, asize; | |
661 | if (vdevid >= spa->spa_root_vdev->vdev_children) { | |
662 | zfs_panic_recover("blkptr at %p DVA %u has invalid " | |
663 | "VDEV %llu", | |
664 | bp, i, (longlong_t)vdevid); | |
665 | } | |
666 | vd = spa->spa_root_vdev->vdev_child[vdevid]; | |
667 | if (vd == NULL) { | |
668 | zfs_panic_recover("blkptr at %p DVA %u has invalid " | |
669 | "VDEV %llu", | |
670 | bp, i, (longlong_t)vdevid); | |
671 | } | |
672 | if (vd->vdev_ops == &vdev_hole_ops) { | |
673 | zfs_panic_recover("blkptr at %p DVA %u has hole " | |
674 | "VDEV %llu", | |
675 | bp, i, (longlong_t)vdevid); | |
676 | ||
677 | } | |
678 | if (vd->vdev_ops == &vdev_missing_ops) { | |
679 | /* | |
680 | * "missing" vdevs are valid during import, but we | |
681 | * don't have their detailed info (e.g. asize), so | |
682 | * we can't perform any more checks on them. | |
683 | */ | |
684 | continue; | |
685 | } | |
686 | offset = DVA_GET_OFFSET(&bp->blk_dva[i]); | |
687 | asize = DVA_GET_ASIZE(&bp->blk_dva[i]); | |
688 | if (BP_IS_GANG(bp)) | |
689 | asize = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE); | |
690 | if (offset + asize > vd->vdev_asize) { | |
691 | zfs_panic_recover("blkptr at %p DVA %u has invalid " | |
692 | "OFFSET %llu", | |
693 | bp, i, (longlong_t)offset); | |
694 | } | |
695 | } | |
696 | } | |
697 | ||
34dc7c2f | 698 | zio_t * |
b128c09f BB |
699 | zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, |
700 | void *data, uint64_t size, zio_done_func_t *done, void *private, | |
5dbd68a3 | 701 | zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb) |
34dc7c2f BB |
702 | { |
703 | zio_t *zio; | |
704 | ||
63e3a861 MA |
705 | zfs_blkptr_verify(spa, bp); |
706 | ||
428870ff | 707 | zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, |
b128c09f BB |
708 | data, size, done, private, |
709 | ZIO_TYPE_READ, priority, flags, NULL, 0, zb, | |
428870ff BB |
710 | ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? |
711 | ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); | |
34dc7c2f | 712 | |
b128c09f BB |
713 | return (zio); |
714 | } | |
34dc7c2f | 715 | |
34dc7c2f | 716 | zio_t * |
b128c09f | 717 | zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, |
428870ff | 718 | void *data, uint64_t size, const zio_prop_t *zp, |
e8b96c60 MA |
719 | zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done, |
720 | void *private, | |
5dbd68a3 | 721 | zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_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 | 731 | zp->zp_copies > 0 && |
03c6040b | 732 | zp->zp_copies <= spa_max_replication(spa)); |
34dc7c2f BB |
733 | |
734 | zio = zio_create(pio, spa, txg, bp, data, size, done, private, | |
b128c09f | 735 | ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, |
428870ff BB |
736 | ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? |
737 | ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); | |
34dc7c2f BB |
738 | |
739 | zio->io_ready = ready; | |
e8b96c60 | 740 | zio->io_physdone = physdone; |
b128c09f | 741 | zio->io_prop = *zp; |
34dc7c2f | 742 | |
9b67f605 MA |
743 | /* |
744 | * Data can be NULL if we are going to call zio_write_override() to | |
745 | * provide the already-allocated BP. But we may need the data to | |
746 | * verify a dedup hit (if requested). In this case, don't try to | |
747 | * dedup (just take the already-allocated BP verbatim). | |
748 | */ | |
749 | if (data == NULL && zio->io_prop.zp_dedup_verify) { | |
750 | zio->io_prop.zp_dedup = zio->io_prop.zp_dedup_verify = B_FALSE; | |
751 | } | |
752 | ||
34dc7c2f BB |
753 | return (zio); |
754 | } | |
755 | ||
756 | zio_t * | |
b128c09f | 757 | zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, |
e8b96c60 | 758 | uint64_t size, zio_done_func_t *done, void *private, |
5dbd68a3 | 759 | zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb) |
34dc7c2f BB |
760 | { |
761 | zio_t *zio; | |
762 | ||
34dc7c2f | 763 | zio = zio_create(pio, spa, txg, bp, data, size, done, private, |
b128c09f BB |
764 | ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, |
765 | ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); | |
34dc7c2f BB |
766 | |
767 | return (zio); | |
768 | } | |
769 | ||
428870ff | 770 | void |
03c6040b | 771 | zio_write_override(zio_t *zio, blkptr_t *bp, int copies, boolean_t nopwrite) |
428870ff BB |
772 | { |
773 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); | |
774 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
775 | ASSERT(zio->io_stage == ZIO_STAGE_OPEN); | |
776 | ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); | |
777 | ||
03c6040b GW |
778 | /* |
779 | * We must reset the io_prop to match the values that existed | |
780 | * when the bp was first written by dmu_sync() keeping in mind | |
781 | * that nopwrite and dedup are mutually exclusive. | |
782 | */ | |
783 | zio->io_prop.zp_dedup = nopwrite ? B_FALSE : zio->io_prop.zp_dedup; | |
784 | zio->io_prop.zp_nopwrite = nopwrite; | |
428870ff BB |
785 | zio->io_prop.zp_copies = copies; |
786 | zio->io_bp_override = bp; | |
787 | } | |
788 | ||
789 | void | |
790 | zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) | |
791 | { | |
9b67f605 MA |
792 | |
793 | /* | |
794 | * The check for EMBEDDED is a performance optimization. We | |
795 | * process the free here (by ignoring it) rather than | |
796 | * putting it on the list and then processing it in zio_free_sync(). | |
797 | */ | |
798 | if (BP_IS_EMBEDDED(bp)) | |
799 | return; | |
13fe0198 | 800 | metaslab_check_free(spa, bp); |
2883cad5 MA |
801 | |
802 | /* | |
803 | * Frees that are for the currently-syncing txg, are not going to be | |
804 | * deferred, and which will not need to do a read (i.e. not GANG or | |
805 | * DEDUP), can be processed immediately. Otherwise, put them on the | |
806 | * in-memory list for later processing. | |
807 | */ | |
808 | if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp) || | |
809 | txg != spa->spa_syncing_txg || | |
810 | spa_sync_pass(spa) >= zfs_sync_pass_deferred_free) { | |
811 | bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp); | |
812 | } else { | |
813 | VERIFY0(zio_wait(zio_free_sync(NULL, spa, txg, bp, 0))); | |
814 | } | |
428870ff BB |
815 | } |
816 | ||
34dc7c2f | 817 | zio_t * |
428870ff BB |
818 | zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
819 | enum zio_flag flags) | |
34dc7c2f BB |
820 | { |
821 | zio_t *zio; | |
2883cad5 | 822 | enum zio_stage stage = ZIO_FREE_PIPELINE; |
34dc7c2f | 823 | |
428870ff BB |
824 | ASSERT(!BP_IS_HOLE(bp)); |
825 | ASSERT(spa_syncing_txg(spa) == txg); | |
55d85d5a | 826 | ASSERT(spa_sync_pass(spa) < zfs_sync_pass_deferred_free); |
34dc7c2f | 827 | |
9b67f605 MA |
828 | if (BP_IS_EMBEDDED(bp)) |
829 | return (zio_null(pio, spa, NULL, NULL, NULL, 0)); | |
830 | ||
13fe0198 | 831 | metaslab_check_free(spa, bp); |
8c841793 | 832 | arc_freed(spa, bp); |
13fe0198 | 833 | |
2883cad5 MA |
834 | /* |
835 | * GANG and DEDUP blocks can induce a read (for the gang block header, | |
836 | * or the DDT), so issue them asynchronously so that this thread is | |
837 | * not tied up. | |
838 | */ | |
839 | if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp)) | |
840 | stage |= ZIO_STAGE_ISSUE_ASYNC; | |
841 | ||
b128c09f | 842 | zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), |
2883cad5 MA |
843 | NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_NOW, flags, |
844 | NULL, 0, NULL, ZIO_STAGE_OPEN, stage); | |
845 | ||
34dc7c2f BB |
846 | return (zio); |
847 | } | |
848 | ||
849 | zio_t * | |
428870ff BB |
850 | zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
851 | zio_done_func_t *done, void *private, enum zio_flag flags) | |
34dc7c2f BB |
852 | { |
853 | zio_t *zio; | |
854 | ||
9b67f605 MA |
855 | dprintf_bp(bp, "claiming in txg %llu", txg); |
856 | ||
857 | if (BP_IS_EMBEDDED(bp)) | |
858 | return (zio_null(pio, spa, NULL, NULL, NULL, 0)); | |
859 | ||
34dc7c2f BB |
860 | /* |
861 | * A claim is an allocation of a specific block. Claims are needed | |
862 | * to support immediate writes in the intent log. The issue is that | |
863 | * immediate writes contain committed data, but in a txg that was | |
864 | * *not* committed. Upon opening the pool after an unclean shutdown, | |
865 | * the intent log claims all blocks that contain immediate write data | |
866 | * so that the SPA knows they're in use. | |
867 | * | |
868 | * All claims *must* be resolved in the first txg -- before the SPA | |
869 | * starts allocating blocks -- so that nothing is allocated twice. | |
428870ff | 870 | * If txg == 0 we just verify that the block is claimable. |
34dc7c2f BB |
871 | */ |
872 | ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); | |
428870ff BB |
873 | ASSERT(txg == spa_first_txg(spa) || txg == 0); |
874 | ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ | |
34dc7c2f | 875 | |
b128c09f BB |
876 | zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), |
877 | done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, | |
878 | NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); | |
34dc7c2f BB |
879 | |
880 | return (zio); | |
881 | } | |
882 | ||
883 | zio_t * | |
884 | zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, | |
e8b96c60 | 885 | zio_done_func_t *done, void *private, enum zio_flag flags) |
34dc7c2f BB |
886 | { |
887 | zio_t *zio; | |
888 | int c; | |
889 | ||
890 | if (vd->vdev_children == 0) { | |
891 | zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, | |
e8b96c60 | 892 | ZIO_TYPE_IOCTL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, |
34dc7c2f BB |
893 | ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); |
894 | ||
34dc7c2f BB |
895 | zio->io_cmd = cmd; |
896 | } else { | |
d164b209 | 897 | zio = zio_null(pio, spa, NULL, NULL, NULL, flags); |
34dc7c2f BB |
898 | |
899 | for (c = 0; c < vd->vdev_children; c++) | |
900 | zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, | |
e8b96c60 | 901 | done, private, flags)); |
34dc7c2f BB |
902 | } |
903 | ||
904 | return (zio); | |
905 | } | |
906 | ||
34dc7c2f BB |
907 | zio_t * |
908 | zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, | |
909 | void *data, int checksum, zio_done_func_t *done, void *private, | |
e8b96c60 | 910 | zio_priority_t priority, enum zio_flag flags, boolean_t labels) |
34dc7c2f BB |
911 | { |
912 | zio_t *zio; | |
34dc7c2f | 913 | |
b128c09f BB |
914 | ASSERT(vd->vdev_children == 0); |
915 | ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || | |
916 | offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); | |
917 | ASSERT3U(offset + size, <=, vd->vdev_psize); | |
34dc7c2f | 918 | |
b128c09f | 919 | zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, |
b02fe35d AR |
920 | ZIO_TYPE_READ, priority, flags | ZIO_FLAG_PHYSICAL, vd, offset, |
921 | NULL, ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); | |
34dc7c2f | 922 | |
b128c09f | 923 | zio->io_prop.zp_checksum = checksum; |
34dc7c2f BB |
924 | |
925 | return (zio); | |
926 | } | |
927 | ||
928 | zio_t * | |
929 | zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, | |
930 | void *data, int checksum, zio_done_func_t *done, void *private, | |
e8b96c60 | 931 | zio_priority_t priority, enum zio_flag flags, boolean_t labels) |
34dc7c2f | 932 | { |
34dc7c2f | 933 | zio_t *zio; |
34dc7c2f | 934 | |
b128c09f BB |
935 | ASSERT(vd->vdev_children == 0); |
936 | ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || | |
937 | offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); | |
938 | ASSERT3U(offset + size, <=, vd->vdev_psize); | |
34dc7c2f | 939 | |
b128c09f | 940 | zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, |
b02fe35d AR |
941 | ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_PHYSICAL, vd, offset, |
942 | NULL, ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); | |
34dc7c2f | 943 | |
b128c09f | 944 | zio->io_prop.zp_checksum = checksum; |
34dc7c2f | 945 | |
428870ff | 946 | if (zio_checksum_table[checksum].ci_eck) { |
34dc7c2f | 947 | /* |
428870ff | 948 | * zec checksums are necessarily destructive -- they modify |
b128c09f | 949 | * the end of the write buffer to hold the verifier/checksum. |
34dc7c2f | 950 | * Therefore, we must make a local copy in case the data is |
b128c09f | 951 | * being written to multiple places in parallel. |
34dc7c2f | 952 | */ |
b128c09f | 953 | void *wbuf = zio_buf_alloc(size); |
34dc7c2f | 954 | bcopy(data, wbuf, size); |
b128c09f | 955 | zio_push_transform(zio, wbuf, size, size, NULL); |
34dc7c2f BB |
956 | } |
957 | ||
958 | return (zio); | |
959 | } | |
960 | ||
961 | /* | |
b128c09f | 962 | * Create a child I/O to do some work for us. |
34dc7c2f BB |
963 | */ |
964 | zio_t * | |
b128c09f | 965 | zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, |
e8b96c60 MA |
966 | void *data, uint64_t size, int type, zio_priority_t priority, |
967 | enum zio_flag flags, zio_done_func_t *done, void *private) | |
34dc7c2f | 968 | { |
428870ff | 969 | enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; |
b128c09f BB |
970 | zio_t *zio; |
971 | ||
972 | ASSERT(vd->vdev_parent == | |
973 | (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); | |
34dc7c2f BB |
974 | |
975 | if (type == ZIO_TYPE_READ && bp != NULL) { | |
976 | /* | |
977 | * If we have the bp, then the child should perform the | |
978 | * checksum and the parent need not. This pushes error | |
979 | * detection as close to the leaves as possible and | |
980 | * eliminates redundant checksums in the interior nodes. | |
981 | */ | |
428870ff BB |
982 | pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; |
983 | pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; | |
34dc7c2f BB |
984 | } |
985 | ||
b128c09f BB |
986 | if (vd->vdev_children == 0) |
987 | offset += VDEV_LABEL_START_SIZE; | |
988 | ||
428870ff BB |
989 | flags |= ZIO_VDEV_CHILD_FLAGS(pio) | ZIO_FLAG_DONT_PROPAGATE; |
990 | ||
991 | /* | |
992 | * If we've decided to do a repair, the write is not speculative -- | |
993 | * even if the original read was. | |
994 | */ | |
995 | if (flags & ZIO_FLAG_IO_REPAIR) | |
996 | flags &= ~ZIO_FLAG_SPECULATIVE; | |
997 | ||
b128c09f | 998 | zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, |
428870ff BB |
999 | done, private, type, priority, flags, vd, offset, &pio->io_bookmark, |
1000 | ZIO_STAGE_VDEV_IO_START >> 1, pipeline); | |
34dc7c2f | 1001 | |
e8b96c60 MA |
1002 | zio->io_physdone = pio->io_physdone; |
1003 | if (vd->vdev_ops->vdev_op_leaf && zio->io_logical != NULL) | |
1004 | zio->io_logical->io_phys_children++; | |
1005 | ||
b128c09f | 1006 | return (zio); |
34dc7c2f BB |
1007 | } |
1008 | ||
b128c09f BB |
1009 | zio_t * |
1010 | zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, | |
e8b96c60 | 1011 | int type, zio_priority_t priority, enum zio_flag flags, |
428870ff | 1012 | zio_done_func_t *done, void *private) |
34dc7c2f | 1013 | { |
b128c09f | 1014 | zio_t *zio; |
34dc7c2f | 1015 | |
b128c09f | 1016 | ASSERT(vd->vdev_ops->vdev_op_leaf); |
34dc7c2f | 1017 | |
b128c09f BB |
1018 | zio = zio_create(NULL, vd->vdev_spa, 0, NULL, |
1019 | data, size, done, private, type, priority, | |
e8b96c60 | 1020 | flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY | ZIO_FLAG_DELEGATED, |
b128c09f | 1021 | vd, offset, NULL, |
428870ff | 1022 | ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); |
34dc7c2f | 1023 | |
b128c09f | 1024 | return (zio); |
34dc7c2f BB |
1025 | } |
1026 | ||
1027 | void | |
b128c09f | 1028 | zio_flush(zio_t *zio, vdev_t *vd) |
34dc7c2f | 1029 | { |
b128c09f | 1030 | zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, |
e8b96c60 | 1031 | NULL, NULL, |
b128c09f | 1032 | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); |
34dc7c2f BB |
1033 | } |
1034 | ||
428870ff BB |
1035 | void |
1036 | zio_shrink(zio_t *zio, uint64_t size) | |
1037 | { | |
1038 | ASSERT(zio->io_executor == NULL); | |
1039 | ASSERT(zio->io_orig_size == zio->io_size); | |
1040 | ASSERT(size <= zio->io_size); | |
1041 | ||
1042 | /* | |
1043 | * We don't shrink for raidz because of problems with the | |
1044 | * reconstruction when reading back less than the block size. | |
1045 | * Note, BP_IS_RAIDZ() assumes no compression. | |
1046 | */ | |
1047 | ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); | |
1048 | if (!BP_IS_RAIDZ(zio->io_bp)) | |
1049 | zio->io_orig_size = zio->io_size = size; | |
1050 | } | |
1051 | ||
34dc7c2f BB |
1052 | /* |
1053 | * ========================================================================== | |
b128c09f | 1054 | * Prepare to read and write logical blocks |
34dc7c2f BB |
1055 | * ========================================================================== |
1056 | */ | |
b128c09f | 1057 | |
34dc7c2f | 1058 | static int |
b128c09f | 1059 | zio_read_bp_init(zio_t *zio) |
34dc7c2f | 1060 | { |
b128c09f | 1061 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 1062 | |
fb5f0bc8 | 1063 | if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && |
9babb374 BB |
1064 | zio->io_child_type == ZIO_CHILD_LOGICAL && |
1065 | !(zio->io_flags & ZIO_FLAG_RAW)) { | |
9b67f605 MA |
1066 | uint64_t psize = |
1067 | BP_IS_EMBEDDED(bp) ? BPE_GET_PSIZE(bp) : BP_GET_PSIZE(bp); | |
428870ff | 1068 | void *cbuf = zio_buf_alloc(psize); |
b128c09f | 1069 | |
428870ff | 1070 | zio_push_transform(zio, cbuf, psize, psize, zio_decompress); |
34dc7c2f | 1071 | } |
34dc7c2f | 1072 | |
9b67f605 MA |
1073 | if (BP_IS_EMBEDDED(bp) && BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA) { |
1074 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
1075 | decode_embedded_bp_compressed(bp, zio->io_data); | |
1076 | } else { | |
1077 | ASSERT(!BP_IS_EMBEDDED(bp)); | |
1078 | } | |
1079 | ||
9ae529ec | 1080 | if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) && BP_GET_LEVEL(bp) == 0) |
b128c09f BB |
1081 | zio->io_flags |= ZIO_FLAG_DONT_CACHE; |
1082 | ||
428870ff BB |
1083 | if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) |
1084 | zio->io_flags |= ZIO_FLAG_DONT_CACHE; | |
1085 | ||
1086 | if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) | |
1087 | zio->io_pipeline = ZIO_DDT_READ_PIPELINE; | |
1088 | ||
b128c09f | 1089 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
1090 | } |
1091 | ||
b128c09f BB |
1092 | static int |
1093 | zio_write_bp_init(zio_t *zio) | |
34dc7c2f | 1094 | { |
428870ff | 1095 | spa_t *spa = zio->io_spa; |
b128c09f | 1096 | zio_prop_t *zp = &zio->io_prop; |
428870ff | 1097 | enum zio_compress compress = zp->zp_compress; |
34dc7c2f | 1098 | blkptr_t *bp = zio->io_bp; |
b128c09f | 1099 | uint64_t lsize = zio->io_size; |
428870ff | 1100 | uint64_t psize = lsize; |
b128c09f | 1101 | int pass = 1; |
34dc7c2f | 1102 | |
b128c09f BB |
1103 | /* |
1104 | * If our children haven't all reached the ready stage, | |
1105 | * wait for them and then repeat this pipeline stage. | |
1106 | */ | |
1107 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || | |
1108 | zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) | |
1109 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 1110 | |
b128c09f BB |
1111 | if (!IO_IS_ALLOCATING(zio)) |
1112 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f | 1113 | |
428870ff BB |
1114 | ASSERT(zio->io_child_type != ZIO_CHILD_DDT); |
1115 | ||
1116 | if (zio->io_bp_override) { | |
1117 | ASSERT(bp->blk_birth != zio->io_txg); | |
1118 | ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); | |
1119 | ||
1120 | *bp = *zio->io_bp_override; | |
1121 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
1122 | ||
9b67f605 MA |
1123 | if (BP_IS_EMBEDDED(bp)) |
1124 | return (ZIO_PIPELINE_CONTINUE); | |
1125 | ||
03c6040b GW |
1126 | /* |
1127 | * If we've been overridden and nopwrite is set then | |
1128 | * set the flag accordingly to indicate that a nopwrite | |
1129 | * has already occurred. | |
1130 | */ | |
1131 | if (!BP_IS_HOLE(bp) && zp->zp_nopwrite) { | |
1132 | ASSERT(!zp->zp_dedup); | |
1133 | zio->io_flags |= ZIO_FLAG_NOPWRITE; | |
1134 | return (ZIO_PIPELINE_CONTINUE); | |
1135 | } | |
1136 | ||
1137 | ASSERT(!zp->zp_nopwrite); | |
1138 | ||
428870ff BB |
1139 | if (BP_IS_HOLE(bp) || !zp->zp_dedup) |
1140 | return (ZIO_PIPELINE_CONTINUE); | |
1141 | ||
1142 | ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup || | |
1143 | zp->zp_dedup_verify); | |
1144 | ||
1145 | if (BP_GET_CHECKSUM(bp) == zp->zp_checksum) { | |
1146 | BP_SET_DEDUP(bp, 1); | |
1147 | zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; | |
1148 | return (ZIO_PIPELINE_CONTINUE); | |
1149 | } | |
428870ff | 1150 | } |
34dc7c2f | 1151 | |
b0bc7a84 | 1152 | if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg) { |
b128c09f BB |
1153 | /* |
1154 | * We're rewriting an existing block, which means we're | |
1155 | * working on behalf of spa_sync(). For spa_sync() to | |
1156 | * converge, it must eventually be the case that we don't | |
1157 | * have to allocate new blocks. But compression changes | |
1158 | * the blocksize, which forces a reallocate, and makes | |
1159 | * convergence take longer. Therefore, after the first | |
1160 | * few passes, stop compressing to ensure convergence. | |
1161 | */ | |
428870ff BB |
1162 | pass = spa_sync_pass(spa); |
1163 | ||
1164 | ASSERT(zio->io_txg == spa_syncing_txg(spa)); | |
1165 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1166 | ASSERT(!BP_GET_DEDUP(bp)); | |
34dc7c2f | 1167 | |
55d85d5a | 1168 | if (pass >= zfs_sync_pass_dont_compress) |
b128c09f | 1169 | compress = ZIO_COMPRESS_OFF; |
34dc7c2f | 1170 | |
b128c09f | 1171 | /* Make sure someone doesn't change their mind on overwrites */ |
9b67f605 | 1172 | ASSERT(BP_IS_EMBEDDED(bp) || MIN(zp->zp_copies + BP_IS_GANG(bp), |
428870ff | 1173 | spa_max_replication(spa)) == BP_GET_NDVAS(bp)); |
b128c09f | 1174 | } |
34dc7c2f | 1175 | |
b128c09f | 1176 | if (compress != ZIO_COMPRESS_OFF) { |
428870ff BB |
1177 | void *cbuf = zio_buf_alloc(lsize); |
1178 | psize = zio_compress_data(compress, zio->io_data, cbuf, lsize); | |
1179 | if (psize == 0 || psize == lsize) { | |
b128c09f | 1180 | compress = ZIO_COMPRESS_OFF; |
428870ff | 1181 | zio_buf_free(cbuf, lsize); |
9b67f605 MA |
1182 | } else if (!zp->zp_dedup && psize <= BPE_PAYLOAD_SIZE && |
1183 | zp->zp_level == 0 && !DMU_OT_HAS_FILL(zp->zp_type) && | |
1184 | spa_feature_is_enabled(spa, SPA_FEATURE_EMBEDDED_DATA)) { | |
1185 | encode_embedded_bp_compressed(bp, | |
1186 | cbuf, compress, lsize, psize); | |
1187 | BPE_SET_ETYPE(bp, BP_EMBEDDED_TYPE_DATA); | |
1188 | BP_SET_TYPE(bp, zio->io_prop.zp_type); | |
1189 | BP_SET_LEVEL(bp, zio->io_prop.zp_level); | |
1190 | zio_buf_free(cbuf, lsize); | |
1191 | bp->blk_birth = zio->io_txg; | |
1192 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
1193 | ASSERT(spa_feature_is_active(spa, | |
1194 | SPA_FEATURE_EMBEDDED_DATA)); | |
1195 | return (ZIO_PIPELINE_CONTINUE); | |
428870ff | 1196 | } else { |
9b67f605 | 1197 | /* |
c3520e7f MA |
1198 | * Round up compressed size up to the ashift |
1199 | * of the smallest-ashift device, and zero the tail. | |
1200 | * This ensures that the compressed size of the BP | |
1201 | * (and thus compressratio property) are correct, | |
1202 | * in that we charge for the padding used to fill out | |
1203 | * the last sector. | |
9b67f605 | 1204 | */ |
c3520e7f MA |
1205 | size_t rounded; |
1206 | ||
1207 | ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT); | |
1208 | ||
1209 | rounded = (size_t)P2ROUNDUP(psize, | |
1210 | 1ULL << spa->spa_min_ashift); | |
1211 | if (rounded >= lsize) { | |
9b67f605 MA |
1212 | compress = ZIO_COMPRESS_OFF; |
1213 | zio_buf_free(cbuf, lsize); | |
c3520e7f | 1214 | psize = lsize; |
9b67f605 | 1215 | } else { |
c3520e7f MA |
1216 | bzero((char *)cbuf + psize, rounded - psize); |
1217 | psize = rounded; | |
9b67f605 MA |
1218 | zio_push_transform(zio, cbuf, |
1219 | psize, lsize, NULL); | |
1220 | } | |
b128c09f BB |
1221 | } |
1222 | } | |
34dc7c2f | 1223 | |
b128c09f BB |
1224 | /* |
1225 | * The final pass of spa_sync() must be all rewrites, but the first | |
1226 | * few passes offer a trade-off: allocating blocks defers convergence, | |
1227 | * but newly allocated blocks are sequential, so they can be written | |
1228 | * to disk faster. Therefore, we allow the first few passes of | |
1229 | * spa_sync() to allocate new blocks, but force rewrites after that. | |
1230 | * There should only be a handful of blocks after pass 1 in any case. | |
1231 | */ | |
b0bc7a84 MG |
1232 | if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg && |
1233 | BP_GET_PSIZE(bp) == psize && | |
55d85d5a | 1234 | pass >= zfs_sync_pass_rewrite) { |
428870ff | 1235 | enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; |
d6320ddb | 1236 | ASSERT(psize != 0); |
b128c09f BB |
1237 | zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; |
1238 | zio->io_flags |= ZIO_FLAG_IO_REWRITE; | |
1239 | } else { | |
1240 | BP_ZERO(bp); | |
1241 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
1242 | } | |
34dc7c2f | 1243 | |
428870ff | 1244 | if (psize == 0) { |
b0bc7a84 MG |
1245 | if (zio->io_bp_orig.blk_birth != 0 && |
1246 | spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { | |
1247 | BP_SET_LSIZE(bp, lsize); | |
1248 | BP_SET_TYPE(bp, zp->zp_type); | |
1249 | BP_SET_LEVEL(bp, zp->zp_level); | |
1250 | BP_SET_BIRTH(bp, zio->io_txg, 0); | |
1251 | } | |
b128c09f BB |
1252 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
1253 | } else { | |
1254 | ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); | |
1255 | BP_SET_LSIZE(bp, lsize); | |
b0bc7a84 MG |
1256 | BP_SET_TYPE(bp, zp->zp_type); |
1257 | BP_SET_LEVEL(bp, zp->zp_level); | |
428870ff | 1258 | BP_SET_PSIZE(bp, psize); |
b128c09f BB |
1259 | BP_SET_COMPRESS(bp, compress); |
1260 | BP_SET_CHECKSUM(bp, zp->zp_checksum); | |
428870ff | 1261 | BP_SET_DEDUP(bp, zp->zp_dedup); |
b128c09f | 1262 | BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); |
428870ff BB |
1263 | if (zp->zp_dedup) { |
1264 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1265 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); | |
1266 | zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; | |
1267 | } | |
03c6040b GW |
1268 | if (zp->zp_nopwrite) { |
1269 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1270 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); | |
1271 | zio->io_pipeline |= ZIO_STAGE_NOP_WRITE; | |
1272 | } | |
428870ff BB |
1273 | } |
1274 | ||
1275 | return (ZIO_PIPELINE_CONTINUE); | |
1276 | } | |
1277 | ||
1278 | static int | |
1279 | zio_free_bp_init(zio_t *zio) | |
1280 | { | |
1281 | blkptr_t *bp = zio->io_bp; | |
1282 | ||
1283 | if (zio->io_child_type == ZIO_CHILD_LOGICAL) { | |
1284 | if (BP_GET_DEDUP(bp)) | |
1285 | zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; | |
b128c09f | 1286 | } |
34dc7c2f BB |
1287 | |
1288 | return (ZIO_PIPELINE_CONTINUE); | |
1289 | } | |
1290 | ||
b128c09f BB |
1291 | /* |
1292 | * ========================================================================== | |
1293 | * Execute the I/O pipeline | |
1294 | * ========================================================================== | |
1295 | */ | |
1296 | ||
1297 | static void | |
7ef5e54e | 1298 | zio_taskq_dispatch(zio_t *zio, zio_taskq_type_t q, boolean_t cutinline) |
34dc7c2f | 1299 | { |
428870ff | 1300 | spa_t *spa = zio->io_spa; |
b128c09f | 1301 | zio_type_t t = zio->io_type; |
a38718a6 | 1302 | int flags = (cutinline ? TQ_FRONT : 0); |
34dc7c2f BB |
1303 | |
1304 | /* | |
9babb374 BB |
1305 | * If we're a config writer or a probe, the normal issue and |
1306 | * interrupt threads may all be blocked waiting for the config lock. | |
1307 | * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. | |
34dc7c2f | 1308 | */ |
9babb374 | 1309 | if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) |
b128c09f | 1310 | t = ZIO_TYPE_NULL; |
34dc7c2f BB |
1311 | |
1312 | /* | |
b128c09f | 1313 | * A similar issue exists for the L2ARC write thread until L2ARC 2.0. |
34dc7c2f | 1314 | */ |
b128c09f BB |
1315 | if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) |
1316 | t = ZIO_TYPE_NULL; | |
34dc7c2f | 1317 | |
428870ff | 1318 | /* |
7ef5e54e AL |
1319 | * If this is a high priority I/O, then use the high priority taskq if |
1320 | * available. | |
428870ff BB |
1321 | */ |
1322 | if (zio->io_priority == ZIO_PRIORITY_NOW && | |
7ef5e54e | 1323 | spa->spa_zio_taskq[t][q + 1].stqs_count != 0) |
428870ff BB |
1324 | q++; |
1325 | ||
1326 | ASSERT3U(q, <, ZIO_TASKQ_TYPES); | |
5cc556b4 | 1327 | |
a38718a6 GA |
1328 | /* |
1329 | * NB: We are assuming that the zio can only be dispatched | |
1330 | * to a single taskq at a time. It would be a grievous error | |
1331 | * to dispatch the zio to another taskq at the same time. | |
1332 | */ | |
1333 | ASSERT(taskq_empty_ent(&zio->io_tqent)); | |
7ef5e54e AL |
1334 | spa_taskq_dispatch_ent(spa, t, q, (task_func_t *)zio_execute, zio, |
1335 | flags, &zio->io_tqent); | |
b128c09f | 1336 | } |
34dc7c2f | 1337 | |
b128c09f | 1338 | static boolean_t |
7ef5e54e | 1339 | zio_taskq_member(zio_t *zio, zio_taskq_type_t q) |
b128c09f BB |
1340 | { |
1341 | kthread_t *executor = zio->io_executor; | |
1342 | spa_t *spa = zio->io_spa; | |
d6320ddb | 1343 | zio_type_t t; |
34dc7c2f | 1344 | |
7ef5e54e AL |
1345 | for (t = 0; t < ZIO_TYPES; t++) { |
1346 | spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; | |
1347 | uint_t i; | |
1348 | for (i = 0; i < tqs->stqs_count; i++) { | |
1349 | if (taskq_member(tqs->stqs_taskq[i], executor)) | |
1350 | return (B_TRUE); | |
1351 | } | |
1352 | } | |
34dc7c2f | 1353 | |
b128c09f BB |
1354 | return (B_FALSE); |
1355 | } | |
34dc7c2f | 1356 | |
b128c09f BB |
1357 | static int |
1358 | zio_issue_async(zio_t *zio) | |
1359 | { | |
428870ff | 1360 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); |
b128c09f BB |
1361 | |
1362 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
1363 | } |
1364 | ||
b128c09f BB |
1365 | void |
1366 | zio_interrupt(zio_t *zio) | |
34dc7c2f | 1367 | { |
428870ff | 1368 | zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE); |
b128c09f | 1369 | } |
34dc7c2f | 1370 | |
b128c09f BB |
1371 | /* |
1372 | * Execute the I/O pipeline until one of the following occurs: | |
1373 | * (1) the I/O completes; (2) the pipeline stalls waiting for | |
1374 | * dependent child I/Os; (3) the I/O issues, so we're waiting | |
1375 | * for an I/O completion interrupt; (4) the I/O is delegated by | |
1376 | * vdev-level caching or aggregation; (5) the I/O is deferred | |
1377 | * due to vdev-level queueing; (6) the I/O is handed off to | |
1378 | * another thread. In all cases, the pipeline stops whenever | |
8e07b99b | 1379 | * there's no CPU work; it never burns a thread in cv_wait_io(). |
b128c09f BB |
1380 | * |
1381 | * There's no locking on io_stage because there's no legitimate way | |
1382 | * for multiple threads to be attempting to process the same I/O. | |
1383 | */ | |
428870ff | 1384 | static zio_pipe_stage_t *zio_pipeline[]; |
34dc7c2f | 1385 | |
da6b4005 NB |
1386 | /* |
1387 | * zio_execute() is a wrapper around the static function | |
1388 | * __zio_execute() so that we can force __zio_execute() to be | |
1389 | * inlined. This reduces stack overhead which is important | |
1390 | * because __zio_execute() is called recursively in several zio | |
1391 | * code paths. zio_execute() itself cannot be inlined because | |
1392 | * it is externally visible. | |
1393 | */ | |
b128c09f BB |
1394 | void |
1395 | zio_execute(zio_t *zio) | |
da6b4005 | 1396 | { |
92119cc2 BB |
1397 | fstrans_cookie_t cookie; |
1398 | ||
1399 | cookie = spl_fstrans_mark(); | |
da6b4005 | 1400 | __zio_execute(zio); |
92119cc2 | 1401 | spl_fstrans_unmark(cookie); |
da6b4005 NB |
1402 | } |
1403 | ||
1404 | __attribute__((always_inline)) | |
1405 | static inline void | |
1406 | __zio_execute(zio_t *zio) | |
b128c09f BB |
1407 | { |
1408 | zio->io_executor = curthread; | |
34dc7c2f | 1409 | |
b128c09f | 1410 | while (zio->io_stage < ZIO_STAGE_DONE) { |
428870ff BB |
1411 | enum zio_stage pipeline = zio->io_pipeline; |
1412 | enum zio_stage stage = zio->io_stage; | |
91579709 | 1413 | dsl_pool_t *dp; |
2fac4c2a | 1414 | boolean_t cut; |
b128c09f | 1415 | int rv; |
34dc7c2f | 1416 | |
b128c09f | 1417 | ASSERT(!MUTEX_HELD(&zio->io_lock)); |
428870ff BB |
1418 | ASSERT(ISP2(stage)); |
1419 | ASSERT(zio->io_stall == NULL); | |
34dc7c2f | 1420 | |
428870ff BB |
1421 | do { |
1422 | stage <<= 1; | |
1423 | } while ((stage & pipeline) == 0); | |
b128c09f BB |
1424 | |
1425 | ASSERT(stage <= ZIO_STAGE_DONE); | |
34dc7c2f | 1426 | |
91579709 | 1427 | dp = spa_get_dsl(zio->io_spa); |
2fac4c2a BB |
1428 | cut = (stage == ZIO_STAGE_VDEV_IO_START) ? |
1429 | zio_requeue_io_start_cut_in_line : B_FALSE; | |
1430 | ||
34dc7c2f | 1431 | /* |
b128c09f BB |
1432 | * If we are in interrupt context and this pipeline stage |
1433 | * will grab a config lock that is held across I/O, | |
428870ff BB |
1434 | * or may wait for an I/O that needs an interrupt thread |
1435 | * to complete, issue async to avoid deadlock. | |
1436 | * | |
1437 | * For VDEV_IO_START, we cut in line so that the io will | |
1438 | * be sent to disk promptly. | |
34dc7c2f | 1439 | */ |
91579709 BB |
1440 | if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && |
1441 | zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { | |
1442 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); | |
1443 | return; | |
1444 | } | |
1445 | ||
1446 | /* | |
1447 | * If we executing in the context of the tx_sync_thread, | |
1448 | * or we are performing pool initialization outside of a | |
34e14332 BB |
1449 | * zio_taskq[ZIO_TASKQ_ISSUE|ZIO_TASKQ_ISSUE_HIGH] context. |
1450 | * Then issue the zio asynchronously to minimize stack usage | |
1451 | * for these deep call paths. | |
91579709 BB |
1452 | */ |
1453 | if ((dp && curthread == dp->dp_tx.tx_sync_thread) || | |
1454 | (dp && spa_is_initializing(dp->dp_spa) && | |
34e14332 BB |
1455 | !zio_taskq_member(zio, ZIO_TASKQ_ISSUE) && |
1456 | !zio_taskq_member(zio, ZIO_TASKQ_ISSUE_HIGH))) { | |
428870ff | 1457 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); |
b128c09f | 1458 | return; |
34dc7c2f BB |
1459 | } |
1460 | ||
b128c09f | 1461 | zio->io_stage = stage; |
9bd274dd | 1462 | rv = zio_pipeline[highbit64(stage) - 1](zio); |
34dc7c2f | 1463 | |
b128c09f BB |
1464 | if (rv == ZIO_PIPELINE_STOP) |
1465 | return; | |
34dc7c2f | 1466 | |
b128c09f BB |
1467 | ASSERT(rv == ZIO_PIPELINE_CONTINUE); |
1468 | } | |
34dc7c2f BB |
1469 | } |
1470 | ||
da6b4005 | 1471 | |
b128c09f BB |
1472 | /* |
1473 | * ========================================================================== | |
1474 | * Initiate I/O, either sync or async | |
1475 | * ========================================================================== | |
1476 | */ | |
1477 | int | |
1478 | zio_wait(zio_t *zio) | |
34dc7c2f | 1479 | { |
b128c09f | 1480 | int error; |
34dc7c2f | 1481 | |
b128c09f BB |
1482 | ASSERT(zio->io_stage == ZIO_STAGE_OPEN); |
1483 | ASSERT(zio->io_executor == NULL); | |
34dc7c2f | 1484 | |
b128c09f | 1485 | zio->io_waiter = curthread; |
34dc7c2f | 1486 | |
da6b4005 | 1487 | __zio_execute(zio); |
34dc7c2f | 1488 | |
b128c09f | 1489 | mutex_enter(&zio->io_lock); |
72f53c56 | 1490 | while (zio->io_executor != NULL) |
72938d69 | 1491 | cv_wait_io(&zio->io_cv, &zio->io_lock); |
b128c09f | 1492 | mutex_exit(&zio->io_lock); |
34dc7c2f | 1493 | |
b128c09f BB |
1494 | error = zio->io_error; |
1495 | zio_destroy(zio); | |
34dc7c2f | 1496 | |
b128c09f BB |
1497 | return (error); |
1498 | } | |
34dc7c2f | 1499 | |
b128c09f BB |
1500 | void |
1501 | zio_nowait(zio_t *zio) | |
1502 | { | |
1503 | ASSERT(zio->io_executor == NULL); | |
34dc7c2f | 1504 | |
d164b209 BB |
1505 | if (zio->io_child_type == ZIO_CHILD_LOGICAL && |
1506 | zio_unique_parent(zio) == NULL) { | |
8878261f BB |
1507 | zio_t *pio; |
1508 | ||
34dc7c2f | 1509 | /* |
b128c09f | 1510 | * This is a logical async I/O with no parent to wait for it. |
9babb374 BB |
1511 | * We add it to the spa_async_root_zio "Godfather" I/O which |
1512 | * will ensure they complete prior to unloading the pool. | |
34dc7c2f | 1513 | */ |
b128c09f | 1514 | spa_t *spa = zio->io_spa; |
8878261f BB |
1515 | kpreempt_disable(); |
1516 | pio = spa->spa_async_zio_root[CPU_SEQID]; | |
1517 | kpreempt_enable(); | |
9babb374 | 1518 | |
8878261f | 1519 | zio_add_child(pio, zio); |
b128c09f | 1520 | } |
34dc7c2f | 1521 | |
da6b4005 | 1522 | __zio_execute(zio); |
b128c09f | 1523 | } |
34dc7c2f | 1524 | |
b128c09f BB |
1525 | /* |
1526 | * ========================================================================== | |
1527 | * Reexecute or suspend/resume failed I/O | |
1528 | * ========================================================================== | |
1529 | */ | |
34dc7c2f | 1530 | |
b128c09f BB |
1531 | static void |
1532 | zio_reexecute(zio_t *pio) | |
1533 | { | |
d164b209 | 1534 | zio_t *cio, *cio_next; |
d6320ddb | 1535 | int c, w; |
d164b209 BB |
1536 | |
1537 | ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); | |
1538 | ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); | |
9babb374 BB |
1539 | ASSERT(pio->io_gang_leader == NULL); |
1540 | ASSERT(pio->io_gang_tree == NULL); | |
34dc7c2f | 1541 | |
b128c09f BB |
1542 | pio->io_flags = pio->io_orig_flags; |
1543 | pio->io_stage = pio->io_orig_stage; | |
1544 | pio->io_pipeline = pio->io_orig_pipeline; | |
1545 | pio->io_reexecute = 0; | |
03c6040b | 1546 | pio->io_flags |= ZIO_FLAG_REEXECUTED; |
b128c09f | 1547 | pio->io_error = 0; |
d6320ddb | 1548 | for (w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 | 1549 | pio->io_state[w] = 0; |
d6320ddb | 1550 | for (c = 0; c < ZIO_CHILD_TYPES; c++) |
b128c09f | 1551 | pio->io_child_error[c] = 0; |
34dc7c2f | 1552 | |
428870ff BB |
1553 | if (IO_IS_ALLOCATING(pio)) |
1554 | BP_ZERO(pio->io_bp); | |
34dc7c2f | 1555 | |
b128c09f BB |
1556 | /* |
1557 | * As we reexecute pio's children, new children could be created. | |
d164b209 | 1558 | * New children go to the head of pio's io_child_list, however, |
b128c09f | 1559 | * so we will (correctly) not reexecute them. The key is that |
d164b209 BB |
1560 | * the remainder of pio's io_child_list, from 'cio_next' onward, |
1561 | * cannot be affected by any side effects of reexecuting 'cio'. | |
b128c09f | 1562 | */ |
d164b209 BB |
1563 | for (cio = zio_walk_children(pio); cio != NULL; cio = cio_next) { |
1564 | cio_next = zio_walk_children(pio); | |
b128c09f | 1565 | mutex_enter(&pio->io_lock); |
d6320ddb | 1566 | for (w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 | 1567 | pio->io_children[cio->io_child_type][w]++; |
b128c09f | 1568 | mutex_exit(&pio->io_lock); |
d164b209 | 1569 | zio_reexecute(cio); |
34dc7c2f | 1570 | } |
34dc7c2f | 1571 | |
b128c09f BB |
1572 | /* |
1573 | * Now that all children have been reexecuted, execute the parent. | |
9babb374 BB |
1574 | * We don't reexecute "The Godfather" I/O here as it's the |
1575 | * responsibility of the caller to wait on him. | |
b128c09f | 1576 | */ |
9babb374 | 1577 | if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) |
da6b4005 | 1578 | __zio_execute(pio); |
34dc7c2f BB |
1579 | } |
1580 | ||
b128c09f BB |
1581 | void |
1582 | zio_suspend(spa_t *spa, zio_t *zio) | |
34dc7c2f | 1583 | { |
b128c09f BB |
1584 | if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) |
1585 | fm_panic("Pool '%s' has encountered an uncorrectable I/O " | |
1586 | "failure and the failure mode property for this pool " | |
1587 | "is set to panic.", spa_name(spa)); | |
34dc7c2f | 1588 | |
bf89c199 BB |
1589 | cmn_err(CE_WARN, "Pool '%s' has encountered an uncorrectable I/O " |
1590 | "failure and has been suspended.\n", spa_name(spa)); | |
1591 | ||
b128c09f | 1592 | zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); |
34dc7c2f | 1593 | |
b128c09f | 1594 | mutex_enter(&spa->spa_suspend_lock); |
34dc7c2f | 1595 | |
b128c09f | 1596 | if (spa->spa_suspend_zio_root == NULL) |
9babb374 BB |
1597 | spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, |
1598 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | | |
1599 | ZIO_FLAG_GODFATHER); | |
34dc7c2f | 1600 | |
b128c09f | 1601 | spa->spa_suspended = B_TRUE; |
34dc7c2f | 1602 | |
b128c09f | 1603 | if (zio != NULL) { |
9babb374 | 1604 | ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); |
b128c09f BB |
1605 | ASSERT(zio != spa->spa_suspend_zio_root); |
1606 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
d164b209 | 1607 | ASSERT(zio_unique_parent(zio) == NULL); |
b128c09f BB |
1608 | ASSERT(zio->io_stage == ZIO_STAGE_DONE); |
1609 | zio_add_child(spa->spa_suspend_zio_root, zio); | |
1610 | } | |
34dc7c2f | 1611 | |
b128c09f BB |
1612 | mutex_exit(&spa->spa_suspend_lock); |
1613 | } | |
34dc7c2f | 1614 | |
9babb374 | 1615 | int |
b128c09f BB |
1616 | zio_resume(spa_t *spa) |
1617 | { | |
9babb374 | 1618 | zio_t *pio; |
34dc7c2f BB |
1619 | |
1620 | /* | |
b128c09f | 1621 | * Reexecute all previously suspended i/o. |
34dc7c2f | 1622 | */ |
b128c09f BB |
1623 | mutex_enter(&spa->spa_suspend_lock); |
1624 | spa->spa_suspended = B_FALSE; | |
1625 | cv_broadcast(&spa->spa_suspend_cv); | |
1626 | pio = spa->spa_suspend_zio_root; | |
1627 | spa->spa_suspend_zio_root = NULL; | |
1628 | mutex_exit(&spa->spa_suspend_lock); | |
1629 | ||
1630 | if (pio == NULL) | |
9babb374 | 1631 | return (0); |
34dc7c2f | 1632 | |
9babb374 BB |
1633 | zio_reexecute(pio); |
1634 | return (zio_wait(pio)); | |
b128c09f BB |
1635 | } |
1636 | ||
1637 | void | |
1638 | zio_resume_wait(spa_t *spa) | |
1639 | { | |
1640 | mutex_enter(&spa->spa_suspend_lock); | |
1641 | while (spa_suspended(spa)) | |
1642 | cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); | |
1643 | mutex_exit(&spa->spa_suspend_lock); | |
34dc7c2f BB |
1644 | } |
1645 | ||
1646 | /* | |
1647 | * ========================================================================== | |
b128c09f BB |
1648 | * Gang blocks. |
1649 | * | |
1650 | * A gang block is a collection of small blocks that looks to the DMU | |
1651 | * like one large block. When zio_dva_allocate() cannot find a block | |
1652 | * of the requested size, due to either severe fragmentation or the pool | |
1653 | * being nearly full, it calls zio_write_gang_block() to construct the | |
1654 | * block from smaller fragments. | |
1655 | * | |
1656 | * A gang block consists of a gang header (zio_gbh_phys_t) and up to | |
1657 | * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like | |
1658 | * an indirect block: it's an array of block pointers. It consumes | |
1659 | * only one sector and hence is allocatable regardless of fragmentation. | |
1660 | * The gang header's bps point to its gang members, which hold the data. | |
1661 | * | |
1662 | * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> | |
1663 | * as the verifier to ensure uniqueness of the SHA256 checksum. | |
1664 | * Critically, the gang block bp's blk_cksum is the checksum of the data, | |
1665 | * not the gang header. This ensures that data block signatures (needed for | |
1666 | * deduplication) are independent of how the block is physically stored. | |
1667 | * | |
1668 | * Gang blocks can be nested: a gang member may itself be a gang block. | |
1669 | * Thus every gang block is a tree in which root and all interior nodes are | |
1670 | * gang headers, and the leaves are normal blocks that contain user data. | |
1671 | * The root of the gang tree is called the gang leader. | |
1672 | * | |
1673 | * To perform any operation (read, rewrite, free, claim) on a gang block, | |
1674 | * zio_gang_assemble() first assembles the gang tree (minus data leaves) | |
1675 | * in the io_gang_tree field of the original logical i/o by recursively | |
1676 | * reading the gang leader and all gang headers below it. This yields | |
1677 | * an in-core tree containing the contents of every gang header and the | |
1678 | * bps for every constituent of the gang block. | |
1679 | * | |
1680 | * With the gang tree now assembled, zio_gang_issue() just walks the gang tree | |
1681 | * and invokes a callback on each bp. To free a gang block, zio_gang_issue() | |
1682 | * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. | |
1683 | * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). | |
1684 | * zio_read_gang() is a wrapper around zio_read() that omits reading gang | |
1685 | * headers, since we already have those in io_gang_tree. zio_rewrite_gang() | |
1686 | * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() | |
1687 | * of the gang header plus zio_checksum_compute() of the data to update the | |
1688 | * gang header's blk_cksum as described above. | |
1689 | * | |
1690 | * The two-phase assemble/issue model solves the problem of partial failure -- | |
1691 | * what if you'd freed part of a gang block but then couldn't read the | |
1692 | * gang header for another part? Assembling the entire gang tree first | |
1693 | * ensures that all the necessary gang header I/O has succeeded before | |
1694 | * starting the actual work of free, claim, or write. Once the gang tree | |
1695 | * is assembled, free and claim are in-memory operations that cannot fail. | |
1696 | * | |
1697 | * In the event that a gang write fails, zio_dva_unallocate() walks the | |
1698 | * gang tree to immediately free (i.e. insert back into the space map) | |
1699 | * everything we've allocated. This ensures that we don't get ENOSPC | |
1700 | * errors during repeated suspend/resume cycles due to a flaky device. | |
1701 | * | |
1702 | * Gang rewrites only happen during sync-to-convergence. If we can't assemble | |
1703 | * the gang tree, we won't modify the block, so we can safely defer the free | |
1704 | * (knowing that the block is still intact). If we *can* assemble the gang | |
1705 | * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free | |
1706 | * each constituent bp and we can allocate a new block on the next sync pass. | |
1707 | * | |
1708 | * In all cases, the gang tree allows complete recovery from partial failure. | |
34dc7c2f BB |
1709 | * ========================================================================== |
1710 | */ | |
b128c09f BB |
1711 | |
1712 | static zio_t * | |
1713 | zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
34dc7c2f | 1714 | { |
b128c09f BB |
1715 | if (gn != NULL) |
1716 | return (pio); | |
34dc7c2f | 1717 | |
b128c09f BB |
1718 | return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), |
1719 | NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), | |
1720 | &pio->io_bookmark)); | |
1721 | } | |
1722 | ||
1723 | zio_t * | |
1724 | zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
1725 | { | |
1726 | zio_t *zio; | |
1727 | ||
1728 | if (gn != NULL) { | |
1729 | zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, | |
1730 | gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, | |
1731 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f | 1732 | /* |
b128c09f BB |
1733 | * As we rewrite each gang header, the pipeline will compute |
1734 | * a new gang block header checksum for it; but no one will | |
1735 | * compute a new data checksum, so we do that here. The one | |
1736 | * exception is the gang leader: the pipeline already computed | |
1737 | * its data checksum because that stage precedes gang assembly. | |
1738 | * (Presently, nothing actually uses interior data checksums; | |
1739 | * this is just good hygiene.) | |
34dc7c2f | 1740 | */ |
9babb374 | 1741 | if (gn != pio->io_gang_leader->io_gang_tree) { |
b128c09f BB |
1742 | zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), |
1743 | data, BP_GET_PSIZE(bp)); | |
1744 | } | |
428870ff BB |
1745 | /* |
1746 | * If we are here to damage data for testing purposes, | |
1747 | * leave the GBH alone so that we can detect the damage. | |
1748 | */ | |
1749 | if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) | |
1750 | zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; | |
34dc7c2f | 1751 | } else { |
b128c09f BB |
1752 | zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, |
1753 | data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, | |
1754 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f BB |
1755 | } |
1756 | ||
b128c09f BB |
1757 | return (zio); |
1758 | } | |
34dc7c2f | 1759 | |
b128c09f BB |
1760 | /* ARGSUSED */ |
1761 | zio_t * | |
1762 | zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
1763 | { | |
428870ff BB |
1764 | return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, |
1765 | ZIO_GANG_CHILD_FLAGS(pio))); | |
34dc7c2f BB |
1766 | } |
1767 | ||
b128c09f BB |
1768 | /* ARGSUSED */ |
1769 | zio_t * | |
1770 | zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) | |
34dc7c2f | 1771 | { |
b128c09f BB |
1772 | return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, |
1773 | NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); | |
1774 | } | |
1775 | ||
1776 | static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { | |
1777 | NULL, | |
1778 | zio_read_gang, | |
1779 | zio_rewrite_gang, | |
1780 | zio_free_gang, | |
1781 | zio_claim_gang, | |
1782 | NULL | |
1783 | }; | |
34dc7c2f | 1784 | |
b128c09f | 1785 | static void zio_gang_tree_assemble_done(zio_t *zio); |
34dc7c2f | 1786 | |
b128c09f BB |
1787 | static zio_gang_node_t * |
1788 | zio_gang_node_alloc(zio_gang_node_t **gnpp) | |
1789 | { | |
1790 | zio_gang_node_t *gn; | |
34dc7c2f | 1791 | |
b128c09f | 1792 | ASSERT(*gnpp == NULL); |
34dc7c2f | 1793 | |
79c76d5b | 1794 | gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); |
b128c09f BB |
1795 | gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); |
1796 | *gnpp = gn; | |
34dc7c2f | 1797 | |
b128c09f | 1798 | return (gn); |
34dc7c2f BB |
1799 | } |
1800 | ||
34dc7c2f | 1801 | static void |
b128c09f | 1802 | zio_gang_node_free(zio_gang_node_t **gnpp) |
34dc7c2f | 1803 | { |
b128c09f | 1804 | zio_gang_node_t *gn = *gnpp; |
d6320ddb | 1805 | int g; |
34dc7c2f | 1806 | |
d6320ddb | 1807 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) |
b128c09f BB |
1808 | ASSERT(gn->gn_child[g] == NULL); |
1809 | ||
1810 | zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); | |
1811 | kmem_free(gn, sizeof (*gn)); | |
1812 | *gnpp = NULL; | |
34dc7c2f BB |
1813 | } |
1814 | ||
b128c09f BB |
1815 | static void |
1816 | zio_gang_tree_free(zio_gang_node_t **gnpp) | |
34dc7c2f | 1817 | { |
b128c09f | 1818 | zio_gang_node_t *gn = *gnpp; |
d6320ddb | 1819 | int g; |
34dc7c2f | 1820 | |
b128c09f BB |
1821 | if (gn == NULL) |
1822 | return; | |
34dc7c2f | 1823 | |
d6320ddb | 1824 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) |
b128c09f | 1825 | zio_gang_tree_free(&gn->gn_child[g]); |
34dc7c2f | 1826 | |
b128c09f | 1827 | zio_gang_node_free(gnpp); |
34dc7c2f BB |
1828 | } |
1829 | ||
b128c09f | 1830 | static void |
9babb374 | 1831 | zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) |
34dc7c2f | 1832 | { |
b128c09f BB |
1833 | zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); |
1834 | ||
9babb374 | 1835 | ASSERT(gio->io_gang_leader == gio); |
b128c09f | 1836 | ASSERT(BP_IS_GANG(bp)); |
34dc7c2f | 1837 | |
9babb374 | 1838 | zio_nowait(zio_read(gio, gio->io_spa, bp, gn->gn_gbh, |
b128c09f | 1839 | SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, |
9babb374 | 1840 | gio->io_priority, ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); |
b128c09f | 1841 | } |
34dc7c2f | 1842 | |
b128c09f BB |
1843 | static void |
1844 | zio_gang_tree_assemble_done(zio_t *zio) | |
1845 | { | |
9babb374 | 1846 | zio_t *gio = zio->io_gang_leader; |
b128c09f BB |
1847 | zio_gang_node_t *gn = zio->io_private; |
1848 | blkptr_t *bp = zio->io_bp; | |
d6320ddb | 1849 | int g; |
34dc7c2f | 1850 | |
9babb374 | 1851 | ASSERT(gio == zio_unique_parent(zio)); |
428870ff | 1852 | ASSERT(zio->io_child_count == 0); |
34dc7c2f | 1853 | |
b128c09f BB |
1854 | if (zio->io_error) |
1855 | return; | |
34dc7c2f | 1856 | |
b128c09f BB |
1857 | if (BP_SHOULD_BYTESWAP(bp)) |
1858 | byteswap_uint64_array(zio->io_data, zio->io_size); | |
34dc7c2f | 1859 | |
b128c09f BB |
1860 | ASSERT(zio->io_data == gn->gn_gbh); |
1861 | ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); | |
428870ff | 1862 | ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); |
34dc7c2f | 1863 | |
d6320ddb | 1864 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
1865 | blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; |
1866 | if (!BP_IS_GANG(gbp)) | |
1867 | continue; | |
9babb374 | 1868 | zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); |
b128c09f | 1869 | } |
34dc7c2f BB |
1870 | } |
1871 | ||
b128c09f BB |
1872 | static void |
1873 | zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) | |
34dc7c2f | 1874 | { |
9babb374 | 1875 | zio_t *gio = pio->io_gang_leader; |
b128c09f | 1876 | zio_t *zio; |
d6320ddb | 1877 | int g; |
34dc7c2f | 1878 | |
b128c09f | 1879 | ASSERT(BP_IS_GANG(bp) == !!gn); |
9babb374 BB |
1880 | ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); |
1881 | ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); | |
34dc7c2f | 1882 | |
b128c09f BB |
1883 | /* |
1884 | * If you're a gang header, your data is in gn->gn_gbh. | |
1885 | * If you're a gang member, your data is in 'data' and gn == NULL. | |
1886 | */ | |
9babb374 | 1887 | zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data); |
34dc7c2f | 1888 | |
b128c09f | 1889 | if (gn != NULL) { |
428870ff | 1890 | ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); |
34dc7c2f | 1891 | |
d6320ddb | 1892 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
1893 | blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; |
1894 | if (BP_IS_HOLE(gbp)) | |
1895 | continue; | |
1896 | zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); | |
1897 | data = (char *)data + BP_GET_PSIZE(gbp); | |
1898 | } | |
34dc7c2f BB |
1899 | } |
1900 | ||
9babb374 BB |
1901 | if (gn == gio->io_gang_tree) |
1902 | ASSERT3P((char *)gio->io_data + gio->io_size, ==, data); | |
34dc7c2f | 1903 | |
b128c09f BB |
1904 | if (zio != pio) |
1905 | zio_nowait(zio); | |
34dc7c2f BB |
1906 | } |
1907 | ||
1908 | static int | |
b128c09f | 1909 | zio_gang_assemble(zio_t *zio) |
34dc7c2f | 1910 | { |
b128c09f | 1911 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 1912 | |
9babb374 BB |
1913 | ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); |
1914 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
1915 | ||
1916 | zio->io_gang_leader = zio; | |
34dc7c2f | 1917 | |
b128c09f | 1918 | zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); |
34dc7c2f BB |
1919 | |
1920 | return (ZIO_PIPELINE_CONTINUE); | |
1921 | } | |
1922 | ||
1923 | static int | |
b128c09f | 1924 | zio_gang_issue(zio_t *zio) |
34dc7c2f | 1925 | { |
b128c09f | 1926 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 1927 | |
b128c09f BB |
1928 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) |
1929 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 1930 | |
9babb374 BB |
1931 | ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); |
1932 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
34dc7c2f | 1933 | |
b128c09f | 1934 | if (zio->io_child_error[ZIO_CHILD_GANG] == 0) |
9babb374 | 1935 | zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_data); |
b128c09f | 1936 | else |
9babb374 | 1937 | zio_gang_tree_free(&zio->io_gang_tree); |
34dc7c2f | 1938 | |
b128c09f | 1939 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
34dc7c2f BB |
1940 | |
1941 | return (ZIO_PIPELINE_CONTINUE); | |
1942 | } | |
1943 | ||
1944 | static void | |
b128c09f | 1945 | zio_write_gang_member_ready(zio_t *zio) |
34dc7c2f | 1946 | { |
d164b209 | 1947 | zio_t *pio = zio_unique_parent(zio); |
34dc7c2f BB |
1948 | dva_t *cdva = zio->io_bp->blk_dva; |
1949 | dva_t *pdva = pio->io_bp->blk_dva; | |
1950 | uint64_t asize; | |
d6320ddb | 1951 | int d; |
d1d7e268 | 1952 | ASSERTV(zio_t *gio = zio->io_gang_leader); |
34dc7c2f | 1953 | |
b128c09f BB |
1954 | if (BP_IS_HOLE(zio->io_bp)) |
1955 | return; | |
1956 | ||
1957 | ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); | |
1958 | ||
1959 | ASSERT(zio->io_child_type == ZIO_CHILD_GANG); | |
428870ff BB |
1960 | ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); |
1961 | ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); | |
1962 | ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); | |
34dc7c2f | 1963 | ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); |
34dc7c2f BB |
1964 | |
1965 | mutex_enter(&pio->io_lock); | |
d6320ddb | 1966 | for (d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { |
34dc7c2f BB |
1967 | ASSERT(DVA_GET_GANG(&pdva[d])); |
1968 | asize = DVA_GET_ASIZE(&pdva[d]); | |
1969 | asize += DVA_GET_ASIZE(&cdva[d]); | |
1970 | DVA_SET_ASIZE(&pdva[d], asize); | |
1971 | } | |
1972 | mutex_exit(&pio->io_lock); | |
1973 | } | |
1974 | ||
1975 | static int | |
b128c09f | 1976 | zio_write_gang_block(zio_t *pio) |
34dc7c2f | 1977 | { |
b128c09f BB |
1978 | spa_t *spa = pio->io_spa; |
1979 | blkptr_t *bp = pio->io_bp; | |
9babb374 | 1980 | zio_t *gio = pio->io_gang_leader; |
b128c09f BB |
1981 | zio_t *zio; |
1982 | zio_gang_node_t *gn, **gnpp; | |
34dc7c2f | 1983 | zio_gbh_phys_t *gbh; |
b128c09f BB |
1984 | uint64_t txg = pio->io_txg; |
1985 | uint64_t resid = pio->io_size; | |
1986 | uint64_t lsize; | |
428870ff BB |
1987 | int copies = gio->io_prop.zp_copies; |
1988 | int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); | |
b128c09f | 1989 | zio_prop_t zp; |
d6320ddb | 1990 | int g, error; |
34dc7c2f | 1991 | |
428870ff BB |
1992 | error = metaslab_alloc(spa, spa_normal_class(spa), SPA_GANGBLOCKSIZE, |
1993 | bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, | |
b128c09f | 1994 | METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); |
34dc7c2f | 1995 | if (error) { |
b128c09f | 1996 | pio->io_error = error; |
34dc7c2f BB |
1997 | return (ZIO_PIPELINE_CONTINUE); |
1998 | } | |
1999 | ||
9babb374 BB |
2000 | if (pio == gio) { |
2001 | gnpp = &gio->io_gang_tree; | |
b128c09f BB |
2002 | } else { |
2003 | gnpp = pio->io_private; | |
2004 | ASSERT(pio->io_ready == zio_write_gang_member_ready); | |
34dc7c2f BB |
2005 | } |
2006 | ||
b128c09f BB |
2007 | gn = zio_gang_node_alloc(gnpp); |
2008 | gbh = gn->gn_gbh; | |
2009 | bzero(gbh, SPA_GANGBLOCKSIZE); | |
34dc7c2f | 2010 | |
b128c09f BB |
2011 | /* |
2012 | * Create the gang header. | |
2013 | */ | |
2014 | zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, | |
2015 | pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f | 2016 | |
b128c09f BB |
2017 | /* |
2018 | * Create and nowait the gang children. | |
2019 | */ | |
d6320ddb | 2020 | for (g = 0; resid != 0; resid -= lsize, g++) { |
b128c09f BB |
2021 | lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), |
2022 | SPA_MINBLOCKSIZE); | |
2023 | ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); | |
2024 | ||
9babb374 | 2025 | zp.zp_checksum = gio->io_prop.zp_checksum; |
b128c09f BB |
2026 | zp.zp_compress = ZIO_COMPRESS_OFF; |
2027 | zp.zp_type = DMU_OT_NONE; | |
2028 | zp.zp_level = 0; | |
428870ff | 2029 | zp.zp_copies = gio->io_prop.zp_copies; |
03c6040b GW |
2030 | zp.zp_dedup = B_FALSE; |
2031 | zp.zp_dedup_verify = B_FALSE; | |
2032 | zp.zp_nopwrite = B_FALSE; | |
b128c09f BB |
2033 | |
2034 | zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], | |
2035 | (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, | |
e8b96c60 | 2036 | zio_write_gang_member_ready, NULL, NULL, &gn->gn_child[g], |
b128c09f BB |
2037 | pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), |
2038 | &pio->io_bookmark)); | |
2039 | } | |
34dc7c2f BB |
2040 | |
2041 | /* | |
b128c09f | 2042 | * Set pio's pipeline to just wait for zio to finish. |
34dc7c2f | 2043 | */ |
b128c09f BB |
2044 | pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
2045 | ||
920dd524 ED |
2046 | /* |
2047 | * We didn't allocate this bp, so make sure it doesn't get unmarked. | |
2048 | */ | |
2049 | pio->io_flags &= ~ZIO_FLAG_FASTWRITE; | |
2050 | ||
b128c09f BB |
2051 | zio_nowait(zio); |
2052 | ||
2053 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f BB |
2054 | } |
2055 | ||
03c6040b GW |
2056 | /* |
2057 | * The zio_nop_write stage in the pipeline determines if allocating | |
2058 | * a new bp is necessary. By leveraging a cryptographically secure checksum, | |
2059 | * such as SHA256, we can compare the checksums of the new data and the old | |
2060 | * to determine if allocating a new block is required. The nopwrite | |
2061 | * feature can handle writes in either syncing or open context (i.e. zil | |
2062 | * writes) and as a result is mutually exclusive with dedup. | |
2063 | */ | |
2064 | static int | |
2065 | zio_nop_write(zio_t *zio) | |
2066 | { | |
2067 | blkptr_t *bp = zio->io_bp; | |
2068 | blkptr_t *bp_orig = &zio->io_bp_orig; | |
2069 | zio_prop_t *zp = &zio->io_prop; | |
2070 | ||
2071 | ASSERT(BP_GET_LEVEL(bp) == 0); | |
2072 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); | |
2073 | ASSERT(zp->zp_nopwrite); | |
2074 | ASSERT(!zp->zp_dedup); | |
2075 | ASSERT(zio->io_bp_override == NULL); | |
2076 | ASSERT(IO_IS_ALLOCATING(zio)); | |
2077 | ||
2078 | /* | |
2079 | * Check to see if the original bp and the new bp have matching | |
2080 | * characteristics (i.e. same checksum, compression algorithms, etc). | |
2081 | * If they don't then just continue with the pipeline which will | |
2082 | * allocate a new bp. | |
2083 | */ | |
2084 | if (BP_IS_HOLE(bp_orig) || | |
2085 | !zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_dedup || | |
2086 | BP_GET_CHECKSUM(bp) != BP_GET_CHECKSUM(bp_orig) || | |
2087 | BP_GET_COMPRESS(bp) != BP_GET_COMPRESS(bp_orig) || | |
2088 | BP_GET_DEDUP(bp) != BP_GET_DEDUP(bp_orig) || | |
2089 | zp->zp_copies != BP_GET_NDVAS(bp_orig)) | |
2090 | return (ZIO_PIPELINE_CONTINUE); | |
2091 | ||
2092 | /* | |
2093 | * If the checksums match then reset the pipeline so that we | |
2094 | * avoid allocating a new bp and issuing any I/O. | |
2095 | */ | |
2096 | if (ZIO_CHECKSUM_EQUAL(bp->blk_cksum, bp_orig->blk_cksum)) { | |
2097 | ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup); | |
2098 | ASSERT3U(BP_GET_PSIZE(bp), ==, BP_GET_PSIZE(bp_orig)); | |
2099 | ASSERT3U(BP_GET_LSIZE(bp), ==, BP_GET_LSIZE(bp_orig)); | |
2100 | ASSERT(zp->zp_compress != ZIO_COMPRESS_OFF); | |
2101 | ASSERT(bcmp(&bp->blk_prop, &bp_orig->blk_prop, | |
2102 | sizeof (uint64_t)) == 0); | |
2103 | ||
2104 | *bp = *bp_orig; | |
2105 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
2106 | zio->io_flags |= ZIO_FLAG_NOPWRITE; | |
2107 | } | |
2108 | ||
2109 | return (ZIO_PIPELINE_CONTINUE); | |
2110 | } | |
2111 | ||
34dc7c2f BB |
2112 | /* |
2113 | * ========================================================================== | |
428870ff | 2114 | * Dedup |
34dc7c2f BB |
2115 | * ========================================================================== |
2116 | */ | |
428870ff BB |
2117 | static void |
2118 | zio_ddt_child_read_done(zio_t *zio) | |
2119 | { | |
2120 | blkptr_t *bp = zio->io_bp; | |
2121 | ddt_entry_t *dde = zio->io_private; | |
2122 | ddt_phys_t *ddp; | |
2123 | zio_t *pio = zio_unique_parent(zio); | |
2124 | ||
2125 | mutex_enter(&pio->io_lock); | |
2126 | ddp = ddt_phys_select(dde, bp); | |
2127 | if (zio->io_error == 0) | |
2128 | ddt_phys_clear(ddp); /* this ddp doesn't need repair */ | |
2129 | if (zio->io_error == 0 && dde->dde_repair_data == NULL) | |
2130 | dde->dde_repair_data = zio->io_data; | |
2131 | else | |
2132 | zio_buf_free(zio->io_data, zio->io_size); | |
2133 | mutex_exit(&pio->io_lock); | |
2134 | } | |
2135 | ||
2136 | static int | |
2137 | zio_ddt_read_start(zio_t *zio) | |
2138 | { | |
2139 | blkptr_t *bp = zio->io_bp; | |
d6320ddb | 2140 | int p; |
428870ff BB |
2141 | |
2142 | ASSERT(BP_GET_DEDUP(bp)); | |
2143 | ASSERT(BP_GET_PSIZE(bp) == zio->io_size); | |
2144 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
2145 | ||
2146 | if (zio->io_child_error[ZIO_CHILD_DDT]) { | |
2147 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
2148 | ddt_entry_t *dde = ddt_repair_start(ddt, bp); | |
2149 | ddt_phys_t *ddp = dde->dde_phys; | |
2150 | ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); | |
2151 | blkptr_t blk; | |
2152 | ||
2153 | ASSERT(zio->io_vsd == NULL); | |
2154 | zio->io_vsd = dde; | |
2155 | ||
2156 | if (ddp_self == NULL) | |
2157 | return (ZIO_PIPELINE_CONTINUE); | |
2158 | ||
d6320ddb | 2159 | for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff BB |
2160 | if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) |
2161 | continue; | |
2162 | ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, | |
2163 | &blk); | |
2164 | zio_nowait(zio_read(zio, zio->io_spa, &blk, | |
2165 | zio_buf_alloc(zio->io_size), zio->io_size, | |
2166 | zio_ddt_child_read_done, dde, zio->io_priority, | |
2167 | ZIO_DDT_CHILD_FLAGS(zio) | ZIO_FLAG_DONT_PROPAGATE, | |
2168 | &zio->io_bookmark)); | |
2169 | } | |
2170 | return (ZIO_PIPELINE_CONTINUE); | |
2171 | } | |
2172 | ||
2173 | zio_nowait(zio_read(zio, zio->io_spa, bp, | |
2174 | zio->io_data, zio->io_size, NULL, NULL, zio->io_priority, | |
2175 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); | |
2176 | ||
2177 | return (ZIO_PIPELINE_CONTINUE); | |
2178 | } | |
2179 | ||
2180 | static int | |
2181 | zio_ddt_read_done(zio_t *zio) | |
2182 | { | |
2183 | blkptr_t *bp = zio->io_bp; | |
2184 | ||
2185 | if (zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE)) | |
2186 | return (ZIO_PIPELINE_STOP); | |
2187 | ||
2188 | ASSERT(BP_GET_DEDUP(bp)); | |
2189 | ASSERT(BP_GET_PSIZE(bp) == zio->io_size); | |
2190 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
2191 | ||
2192 | if (zio->io_child_error[ZIO_CHILD_DDT]) { | |
2193 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
2194 | ddt_entry_t *dde = zio->io_vsd; | |
2195 | if (ddt == NULL) { | |
2196 | ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE); | |
2197 | return (ZIO_PIPELINE_CONTINUE); | |
2198 | } | |
2199 | if (dde == NULL) { | |
2200 | zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; | |
2201 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); | |
2202 | return (ZIO_PIPELINE_STOP); | |
2203 | } | |
2204 | if (dde->dde_repair_data != NULL) { | |
2205 | bcopy(dde->dde_repair_data, zio->io_data, zio->io_size); | |
2206 | zio->io_child_error[ZIO_CHILD_DDT] = 0; | |
2207 | } | |
2208 | ddt_repair_done(ddt, dde); | |
2209 | zio->io_vsd = NULL; | |
2210 | } | |
2211 | ||
2212 | ASSERT(zio->io_vsd == NULL); | |
2213 | ||
2214 | return (ZIO_PIPELINE_CONTINUE); | |
2215 | } | |
2216 | ||
2217 | static boolean_t | |
2218 | zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) | |
2219 | { | |
2220 | spa_t *spa = zio->io_spa; | |
d6320ddb | 2221 | int p; |
428870ff BB |
2222 | |
2223 | /* | |
2224 | * Note: we compare the original data, not the transformed data, | |
2225 | * because when zio->io_bp is an override bp, we will not have | |
2226 | * pushed the I/O transforms. That's an important optimization | |
2227 | * because otherwise we'd compress/encrypt all dmu_sync() data twice. | |
2228 | */ | |
d6320ddb | 2229 | for (p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { |
428870ff BB |
2230 | zio_t *lio = dde->dde_lead_zio[p]; |
2231 | ||
2232 | if (lio != NULL) { | |
2233 | return (lio->io_orig_size != zio->io_orig_size || | |
2234 | bcmp(zio->io_orig_data, lio->io_orig_data, | |
2235 | zio->io_orig_size) != 0); | |
2236 | } | |
2237 | } | |
2238 | ||
d6320ddb | 2239 | for (p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { |
428870ff BB |
2240 | ddt_phys_t *ddp = &dde->dde_phys[p]; |
2241 | ||
2242 | if (ddp->ddp_phys_birth != 0) { | |
2243 | arc_buf_t *abuf = NULL; | |
2a432414 | 2244 | arc_flags_t aflags = ARC_FLAG_WAIT; |
428870ff BB |
2245 | blkptr_t blk = *zio->io_bp; |
2246 | int error; | |
2247 | ||
2248 | ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); | |
2249 | ||
2250 | ddt_exit(ddt); | |
2251 | ||
294f6806 | 2252 | error = arc_read(NULL, spa, &blk, |
428870ff BB |
2253 | arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, |
2254 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, | |
2255 | &aflags, &zio->io_bookmark); | |
2256 | ||
2257 | if (error == 0) { | |
2258 | if (arc_buf_size(abuf) != zio->io_orig_size || | |
2259 | bcmp(abuf->b_data, zio->io_orig_data, | |
2260 | zio->io_orig_size) != 0) | |
2e528b49 | 2261 | error = SET_ERROR(EEXIST); |
13fe0198 | 2262 | VERIFY(arc_buf_remove_ref(abuf, &abuf)); |
428870ff BB |
2263 | } |
2264 | ||
2265 | ddt_enter(ddt); | |
2266 | return (error != 0); | |
2267 | } | |
2268 | } | |
2269 | ||
2270 | return (B_FALSE); | |
2271 | } | |
2272 | ||
2273 | static void | |
2274 | zio_ddt_child_write_ready(zio_t *zio) | |
2275 | { | |
2276 | int p = zio->io_prop.zp_copies; | |
2277 | ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); | |
2278 | ddt_entry_t *dde = zio->io_private; | |
2279 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
2280 | zio_t *pio; | |
2281 | ||
2282 | if (zio->io_error) | |
2283 | return; | |
2284 | ||
2285 | ddt_enter(ddt); | |
2286 | ||
2287 | ASSERT(dde->dde_lead_zio[p] == zio); | |
2288 | ||
2289 | ddt_phys_fill(ddp, zio->io_bp); | |
2290 | ||
2291 | while ((pio = zio_walk_parents(zio)) != NULL) | |
2292 | ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); | |
2293 | ||
2294 | ddt_exit(ddt); | |
2295 | } | |
2296 | ||
2297 | static void | |
2298 | zio_ddt_child_write_done(zio_t *zio) | |
2299 | { | |
2300 | int p = zio->io_prop.zp_copies; | |
2301 | ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); | |
2302 | ddt_entry_t *dde = zio->io_private; | |
2303 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
2304 | ||
2305 | ddt_enter(ddt); | |
2306 | ||
2307 | ASSERT(ddp->ddp_refcnt == 0); | |
2308 | ASSERT(dde->dde_lead_zio[p] == zio); | |
2309 | dde->dde_lead_zio[p] = NULL; | |
2310 | ||
2311 | if (zio->io_error == 0) { | |
2312 | while (zio_walk_parents(zio) != NULL) | |
2313 | ddt_phys_addref(ddp); | |
2314 | } else { | |
2315 | ddt_phys_clear(ddp); | |
2316 | } | |
2317 | ||
2318 | ddt_exit(ddt); | |
2319 | } | |
2320 | ||
2321 | static void | |
2322 | zio_ddt_ditto_write_done(zio_t *zio) | |
2323 | { | |
2324 | int p = DDT_PHYS_DITTO; | |
428870ff BB |
2325 | blkptr_t *bp = zio->io_bp; |
2326 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
2327 | ddt_entry_t *dde = zio->io_private; | |
2328 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
2329 | ddt_key_t *ddk = &dde->dde_key; | |
1fde1e37 | 2330 | ASSERTV(zio_prop_t *zp = &zio->io_prop); |
428870ff BB |
2331 | |
2332 | ddt_enter(ddt); | |
2333 | ||
2334 | ASSERT(ddp->ddp_refcnt == 0); | |
2335 | ASSERT(dde->dde_lead_zio[p] == zio); | |
2336 | dde->dde_lead_zio[p] = NULL; | |
2337 | ||
2338 | if (zio->io_error == 0) { | |
2339 | ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); | |
2340 | ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); | |
2341 | ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); | |
2342 | if (ddp->ddp_phys_birth != 0) | |
2343 | ddt_phys_free(ddt, ddk, ddp, zio->io_txg); | |
2344 | ddt_phys_fill(ddp, bp); | |
2345 | } | |
2346 | ||
2347 | ddt_exit(ddt); | |
2348 | } | |
2349 | ||
2350 | static int | |
2351 | zio_ddt_write(zio_t *zio) | |
2352 | { | |
2353 | spa_t *spa = zio->io_spa; | |
2354 | blkptr_t *bp = zio->io_bp; | |
2355 | uint64_t txg = zio->io_txg; | |
2356 | zio_prop_t *zp = &zio->io_prop; | |
2357 | int p = zp->zp_copies; | |
2358 | int ditto_copies; | |
2359 | zio_t *cio = NULL; | |
2360 | zio_t *dio = NULL; | |
2361 | ddt_t *ddt = ddt_select(spa, bp); | |
2362 | ddt_entry_t *dde; | |
2363 | ddt_phys_t *ddp; | |
2364 | ||
2365 | ASSERT(BP_GET_DEDUP(bp)); | |
2366 | ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); | |
2367 | ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); | |
2368 | ||
2369 | ddt_enter(ddt); | |
2370 | dde = ddt_lookup(ddt, bp, B_TRUE); | |
2371 | ddp = &dde->dde_phys[p]; | |
2372 | ||
2373 | if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { | |
2374 | /* | |
2375 | * If we're using a weak checksum, upgrade to a strong checksum | |
2376 | * and try again. If we're already using a strong checksum, | |
2377 | * we can't resolve it, so just convert to an ordinary write. | |
2378 | * (And automatically e-mail a paper to Nature?) | |
2379 | */ | |
2380 | if (!zio_checksum_table[zp->zp_checksum].ci_dedup) { | |
2381 | zp->zp_checksum = spa_dedup_checksum(spa); | |
2382 | zio_pop_transforms(zio); | |
2383 | zio->io_stage = ZIO_STAGE_OPEN; | |
2384 | BP_ZERO(bp); | |
2385 | } else { | |
03c6040b | 2386 | zp->zp_dedup = B_FALSE; |
428870ff BB |
2387 | } |
2388 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
2389 | ddt_exit(ddt); | |
2390 | return (ZIO_PIPELINE_CONTINUE); | |
2391 | } | |
2392 | ||
2393 | ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); | |
2394 | ASSERT(ditto_copies < SPA_DVAS_PER_BP); | |
2395 | ||
2396 | if (ditto_copies > ddt_ditto_copies_present(dde) && | |
2397 | dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { | |
2398 | zio_prop_t czp = *zp; | |
2399 | ||
2400 | czp.zp_copies = ditto_copies; | |
2401 | ||
2402 | /* | |
2403 | * If we arrived here with an override bp, we won't have run | |
2404 | * the transform stack, so we won't have the data we need to | |
2405 | * generate a child i/o. So, toss the override bp and restart. | |
2406 | * This is safe, because using the override bp is just an | |
2407 | * optimization; and it's rare, so the cost doesn't matter. | |
2408 | */ | |
2409 | if (zio->io_bp_override) { | |
2410 | zio_pop_transforms(zio); | |
2411 | zio->io_stage = ZIO_STAGE_OPEN; | |
2412 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
2413 | zio->io_bp_override = NULL; | |
2414 | BP_ZERO(bp); | |
2415 | ddt_exit(ddt); | |
2416 | return (ZIO_PIPELINE_CONTINUE); | |
2417 | } | |
2418 | ||
2419 | dio = zio_write(zio, spa, txg, bp, zio->io_orig_data, | |
e8b96c60 | 2420 | zio->io_orig_size, &czp, NULL, NULL, |
428870ff BB |
2421 | zio_ddt_ditto_write_done, dde, zio->io_priority, |
2422 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); | |
2423 | ||
2424 | zio_push_transform(dio, zio->io_data, zio->io_size, 0, NULL); | |
2425 | dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; | |
2426 | } | |
2427 | ||
2428 | if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { | |
2429 | if (ddp->ddp_phys_birth != 0) | |
2430 | ddt_bp_fill(ddp, bp, txg); | |
2431 | if (dde->dde_lead_zio[p] != NULL) | |
2432 | zio_add_child(zio, dde->dde_lead_zio[p]); | |
2433 | else | |
2434 | ddt_phys_addref(ddp); | |
2435 | } else if (zio->io_bp_override) { | |
2436 | ASSERT(bp->blk_birth == txg); | |
2437 | ASSERT(BP_EQUAL(bp, zio->io_bp_override)); | |
2438 | ddt_phys_fill(ddp, bp); | |
2439 | ddt_phys_addref(ddp); | |
2440 | } else { | |
2441 | cio = zio_write(zio, spa, txg, bp, zio->io_orig_data, | |
e8b96c60 | 2442 | zio->io_orig_size, zp, zio_ddt_child_write_ready, NULL, |
428870ff BB |
2443 | zio_ddt_child_write_done, dde, zio->io_priority, |
2444 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); | |
2445 | ||
2446 | zio_push_transform(cio, zio->io_data, zio->io_size, 0, NULL); | |
2447 | dde->dde_lead_zio[p] = cio; | |
2448 | } | |
2449 | ||
2450 | ddt_exit(ddt); | |
2451 | ||
2452 | if (cio) | |
2453 | zio_nowait(cio); | |
2454 | if (dio) | |
2455 | zio_nowait(dio); | |
2456 | ||
2457 | return (ZIO_PIPELINE_CONTINUE); | |
2458 | } | |
2459 | ||
2460 | ddt_entry_t *freedde; /* for debugging */ | |
b128c09f | 2461 | |
428870ff BB |
2462 | static int |
2463 | zio_ddt_free(zio_t *zio) | |
2464 | { | |
2465 | spa_t *spa = zio->io_spa; | |
2466 | blkptr_t *bp = zio->io_bp; | |
2467 | ddt_t *ddt = ddt_select(spa, bp); | |
2468 | ddt_entry_t *dde; | |
2469 | ddt_phys_t *ddp; | |
2470 | ||
2471 | ASSERT(BP_GET_DEDUP(bp)); | |
2472 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
2473 | ||
2474 | ddt_enter(ddt); | |
2475 | freedde = dde = ddt_lookup(ddt, bp, B_TRUE); | |
5dc6af0e BB |
2476 | if (dde) { |
2477 | ddp = ddt_phys_select(dde, bp); | |
2478 | if (ddp) | |
2479 | ddt_phys_decref(ddp); | |
2480 | } | |
428870ff BB |
2481 | ddt_exit(ddt); |
2482 | ||
2483 | return (ZIO_PIPELINE_CONTINUE); | |
2484 | } | |
2485 | ||
2486 | /* | |
2487 | * ========================================================================== | |
2488 | * Allocate and free blocks | |
2489 | * ========================================================================== | |
2490 | */ | |
34dc7c2f BB |
2491 | static int |
2492 | zio_dva_allocate(zio_t *zio) | |
2493 | { | |
2494 | spa_t *spa = zio->io_spa; | |
428870ff | 2495 | metaslab_class_t *mc = spa_normal_class(spa); |
34dc7c2f BB |
2496 | blkptr_t *bp = zio->io_bp; |
2497 | int error; | |
6d974228 | 2498 | int flags = 0; |
34dc7c2f | 2499 | |
9babb374 BB |
2500 | if (zio->io_gang_leader == NULL) { |
2501 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
2502 | zio->io_gang_leader = zio; | |
2503 | } | |
2504 | ||
34dc7c2f | 2505 | ASSERT(BP_IS_HOLE(bp)); |
c99c9001 | 2506 | ASSERT0(BP_GET_NDVAS(bp)); |
428870ff BB |
2507 | ASSERT3U(zio->io_prop.zp_copies, >, 0); |
2508 | ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); | |
34dc7c2f BB |
2509 | ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); |
2510 | ||
6d974228 GW |
2511 | /* |
2512 | * The dump device does not support gang blocks so allocation on | |
2513 | * behalf of the dump device (i.e. ZIO_FLAG_NODATA) must avoid | |
2514 | * the "fast" gang feature. | |
2515 | */ | |
2516 | flags |= (zio->io_flags & ZIO_FLAG_NODATA) ? METASLAB_GANG_AVOID : 0; | |
2517 | flags |= (zio->io_flags & ZIO_FLAG_GANG_CHILD) ? | |
2518 | METASLAB_GANG_CHILD : 0; | |
920dd524 | 2519 | flags |= (zio->io_flags & ZIO_FLAG_FASTWRITE) ? METASLAB_FASTWRITE : 0; |
b128c09f | 2520 | error = metaslab_alloc(spa, mc, zio->io_size, bp, |
6d974228 | 2521 | zio->io_prop.zp_copies, zio->io_txg, NULL, flags); |
34dc7c2f | 2522 | |
b128c09f | 2523 | if (error) { |
6d974228 GW |
2524 | spa_dbgmsg(spa, "%s: metaslab allocation failure: zio %p, " |
2525 | "size %llu, error %d", spa_name(spa), zio, zio->io_size, | |
2526 | error); | |
b128c09f BB |
2527 | if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) |
2528 | return (zio_write_gang_block(zio)); | |
34dc7c2f BB |
2529 | zio->io_error = error; |
2530 | } | |
2531 | ||
2532 | return (ZIO_PIPELINE_CONTINUE); | |
2533 | } | |
2534 | ||
2535 | static int | |
2536 | zio_dva_free(zio_t *zio) | |
2537 | { | |
b128c09f | 2538 | metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); |
34dc7c2f BB |
2539 | |
2540 | return (ZIO_PIPELINE_CONTINUE); | |
2541 | } | |
2542 | ||
2543 | static int | |
2544 | zio_dva_claim(zio_t *zio) | |
2545 | { | |
b128c09f BB |
2546 | int error; |
2547 | ||
2548 | error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); | |
2549 | if (error) | |
2550 | zio->io_error = error; | |
34dc7c2f BB |
2551 | |
2552 | return (ZIO_PIPELINE_CONTINUE); | |
2553 | } | |
2554 | ||
b128c09f BB |
2555 | /* |
2556 | * Undo an allocation. This is used by zio_done() when an I/O fails | |
2557 | * and we want to give back the block we just allocated. | |
2558 | * This handles both normal blocks and gang blocks. | |
2559 | */ | |
2560 | static void | |
2561 | zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) | |
2562 | { | |
d6320ddb BB |
2563 | int g; |
2564 | ||
b128c09f | 2565 | ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); |
428870ff | 2566 | ASSERT(zio->io_bp_override == NULL); |
b128c09f BB |
2567 | |
2568 | if (!BP_IS_HOLE(bp)) | |
428870ff | 2569 | metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); |
b128c09f BB |
2570 | |
2571 | if (gn != NULL) { | |
d6320ddb | 2572 | for (g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
2573 | zio_dva_unallocate(zio, gn->gn_child[g], |
2574 | &gn->gn_gbh->zg_blkptr[g]); | |
2575 | } | |
2576 | } | |
2577 | } | |
2578 | ||
2579 | /* | |
2580 | * Try to allocate an intent log block. Return 0 on success, errno on failure. | |
2581 | */ | |
2582 | int | |
920dd524 ED |
2583 | zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, uint64_t size, |
2584 | boolean_t use_slog) | |
b128c09f | 2585 | { |
428870ff | 2586 | int error = 1; |
b128c09f | 2587 | |
428870ff BB |
2588 | ASSERT(txg > spa_syncing_txg(spa)); |
2589 | ||
ebf8e3a2 BB |
2590 | /* |
2591 | * ZIL blocks are always contiguous (i.e. not gang blocks) so we | |
2592 | * set the METASLAB_GANG_AVOID flag so that they don't "fast gang" | |
2593 | * when allocating them. | |
2594 | */ | |
2595 | if (use_slog) { | |
428870ff | 2596 | error = metaslab_alloc(spa, spa_log_class(spa), size, |
920dd524 ED |
2597 | new_bp, 1, txg, NULL, |
2598 | METASLAB_FASTWRITE | METASLAB_GANG_AVOID); | |
ebf8e3a2 | 2599 | } |
b128c09f | 2600 | |
ebf8e3a2 | 2601 | if (error) { |
428870ff | 2602 | error = metaslab_alloc(spa, spa_normal_class(spa), size, |
920dd524 | 2603 | new_bp, 1, txg, NULL, |
ac72fac3 | 2604 | METASLAB_FASTWRITE); |
ebf8e3a2 | 2605 | } |
b128c09f BB |
2606 | |
2607 | if (error == 0) { | |
2608 | BP_SET_LSIZE(new_bp, size); | |
2609 | BP_SET_PSIZE(new_bp, size); | |
2610 | BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); | |
428870ff BB |
2611 | BP_SET_CHECKSUM(new_bp, |
2612 | spa_version(spa) >= SPA_VERSION_SLIM_ZIL | |
2613 | ? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG); | |
b128c09f BB |
2614 | BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); |
2615 | BP_SET_LEVEL(new_bp, 0); | |
428870ff | 2616 | BP_SET_DEDUP(new_bp, 0); |
b128c09f BB |
2617 | BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); |
2618 | } | |
2619 | ||
2620 | return (error); | |
2621 | } | |
2622 | ||
2623 | /* | |
428870ff | 2624 | * Free an intent log block. |
b128c09f BB |
2625 | */ |
2626 | void | |
428870ff | 2627 | zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp) |
b128c09f | 2628 | { |
428870ff | 2629 | ASSERT(BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG); |
b128c09f BB |
2630 | ASSERT(!BP_IS_GANG(bp)); |
2631 | ||
428870ff | 2632 | zio_free(spa, txg, bp); |
b128c09f BB |
2633 | } |
2634 | ||
34dc7c2f BB |
2635 | /* |
2636 | * ========================================================================== | |
2637 | * Read and write to physical devices | |
2638 | * ========================================================================== | |
2639 | */ | |
98b25418 GW |
2640 | |
2641 | ||
2642 | /* | |
2643 | * Issue an I/O to the underlying vdev. Typically the issue pipeline | |
2644 | * stops after this stage and will resume upon I/O completion. | |
2645 | * However, there are instances where the vdev layer may need to | |
2646 | * continue the pipeline when an I/O was not issued. Since the I/O | |
2647 | * that was sent to the vdev layer might be different than the one | |
2648 | * currently active in the pipeline (see vdev_queue_io()), we explicitly | |
2649 | * force the underlying vdev layers to call either zio_execute() or | |
2650 | * zio_interrupt() to ensure that the pipeline continues with the correct I/O. | |
2651 | */ | |
34dc7c2f BB |
2652 | static int |
2653 | zio_vdev_io_start(zio_t *zio) | |
2654 | { | |
2655 | vdev_t *vd = zio->io_vd; | |
34dc7c2f BB |
2656 | uint64_t align; |
2657 | spa_t *spa = zio->io_spa; | |
2658 | ||
b128c09f BB |
2659 | ASSERT(zio->io_error == 0); |
2660 | ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); | |
34dc7c2f | 2661 | |
b128c09f BB |
2662 | if (vd == NULL) { |
2663 | if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) | |
2664 | spa_config_enter(spa, SCL_ZIO, zio, RW_READER); | |
34dc7c2f | 2665 | |
b128c09f BB |
2666 | /* |
2667 | * The mirror_ops handle multiple DVAs in a single BP. | |
2668 | */ | |
98b25418 GW |
2669 | vdev_mirror_ops.vdev_op_io_start(zio); |
2670 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
2671 | } |
2672 | ||
572e2857 BB |
2673 | /* |
2674 | * We keep track of time-sensitive I/Os so that the scan thread | |
2675 | * can quickly react to certain workloads. In particular, we care | |
2676 | * about non-scrubbing, top-level reads and writes with the following | |
2677 | * characteristics: | |
98b25418 | 2678 | * - synchronous writes of user data to non-slog devices |
572e2857 BB |
2679 | * - any reads of user data |
2680 | * When these conditions are met, adjust the timestamp of spa_last_io | |
2681 | * which allows the scan thread to adjust its workload accordingly. | |
2682 | */ | |
2683 | if (!(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && zio->io_bp != NULL && | |
2684 | vd == vd->vdev_top && !vd->vdev_islog && | |
2685 | zio->io_bookmark.zb_objset != DMU_META_OBJSET && | |
2686 | zio->io_txg != spa_syncing_txg(spa)) { | |
2687 | uint64_t old = spa->spa_last_io; | |
2688 | uint64_t new = ddi_get_lbolt64(); | |
2689 | if (old != new) | |
2690 | (void) atomic_cas_64(&spa->spa_last_io, old, new); | |
2691 | } | |
2692 | ||
b128c09f BB |
2693 | align = 1ULL << vd->vdev_top->vdev_ashift; |
2694 | ||
b02fe35d AR |
2695 | if (!(zio->io_flags & ZIO_FLAG_PHYSICAL) && |
2696 | P2PHASE(zio->io_size, align) != 0) { | |
2697 | /* Transform logical writes to be a full physical block size. */ | |
34dc7c2f BB |
2698 | uint64_t asize = P2ROUNDUP(zio->io_size, align); |
2699 | char *abuf = zio_buf_alloc(asize); | |
178e73b3 | 2700 | ASSERT(vd == vd->vdev_top); |
34dc7c2f BB |
2701 | if (zio->io_type == ZIO_TYPE_WRITE) { |
2702 | bcopy(zio->io_data, abuf, zio->io_size); | |
2703 | bzero(abuf + zio->io_size, asize - zio->io_size); | |
2704 | } | |
b128c09f | 2705 | zio_push_transform(zio, abuf, asize, asize, zio_subblock); |
34dc7c2f BB |
2706 | } |
2707 | ||
b02fe35d AR |
2708 | /* |
2709 | * If this is not a physical io, make sure that it is properly aligned | |
2710 | * before proceeding. | |
2711 | */ | |
2712 | if (!(zio->io_flags & ZIO_FLAG_PHYSICAL)) { | |
2713 | ASSERT0(P2PHASE(zio->io_offset, align)); | |
2714 | ASSERT0(P2PHASE(zio->io_size, align)); | |
2715 | } else { | |
2716 | /* | |
2717 | * For physical writes, we allow 512b aligned writes and assume | |
2718 | * the device will perform a read-modify-write as necessary. | |
2719 | */ | |
2720 | ASSERT0(P2PHASE(zio->io_offset, SPA_MINBLOCKSIZE)); | |
2721 | ASSERT0(P2PHASE(zio->io_size, SPA_MINBLOCKSIZE)); | |
2722 | } | |
2723 | ||
572e2857 | 2724 | VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); |
fb5f0bc8 BB |
2725 | |
2726 | /* | |
2727 | * If this is a repair I/O, and there's no self-healing involved -- | |
2728 | * that is, we're just resilvering what we expect to resilver -- | |
2729 | * then don't do the I/O unless zio's txg is actually in vd's DTL. | |
2730 | * This prevents spurious resilvering with nested replication. | |
2731 | * For example, given a mirror of mirrors, (A+B)+(C+D), if only | |
2732 | * A is out of date, we'll read from C+D, then use the data to | |
2733 | * resilver A+B -- but we don't actually want to resilver B, just A. | |
2734 | * The top-level mirror has no way to know this, so instead we just | |
2735 | * discard unnecessary repairs as we work our way down the vdev tree. | |
2736 | * The same logic applies to any form of nested replication: | |
2737 | * ditto + mirror, RAID-Z + replacing, etc. This covers them all. | |
2738 | */ | |
2739 | if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && | |
2740 | !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && | |
2741 | zio->io_txg != 0 && /* not a delegated i/o */ | |
2742 | !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { | |
2743 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); | |
fb5f0bc8 BB |
2744 | zio_vdev_io_bypass(zio); |
2745 | return (ZIO_PIPELINE_CONTINUE); | |
2746 | } | |
34dc7c2f | 2747 | |
b128c09f BB |
2748 | if (vd->vdev_ops->vdev_op_leaf && |
2749 | (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { | |
2750 | ||
b0bc7a84 | 2751 | if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio)) |
d164b209 | 2752 | return (ZIO_PIPELINE_CONTINUE); |
b128c09f BB |
2753 | |
2754 | if ((zio = vdev_queue_io(zio)) == NULL) | |
2755 | return (ZIO_PIPELINE_STOP); | |
2756 | ||
2757 | if (!vdev_accessible(vd, zio)) { | |
2e528b49 | 2758 | zio->io_error = SET_ERROR(ENXIO); |
b128c09f BB |
2759 | zio_interrupt(zio); |
2760 | return (ZIO_PIPELINE_STOP); | |
2761 | } | |
b128c09f BB |
2762 | } |
2763 | ||
98b25418 GW |
2764 | vd->vdev_ops->vdev_op_io_start(zio); |
2765 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
2766 | } |
2767 | ||
2768 | static int | |
2769 | zio_vdev_io_done(zio_t *zio) | |
2770 | { | |
b128c09f BB |
2771 | vdev_t *vd = zio->io_vd; |
2772 | vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; | |
2773 | boolean_t unexpected_error = B_FALSE; | |
34dc7c2f | 2774 | |
b128c09f BB |
2775 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) |
2776 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 2777 | |
b128c09f BB |
2778 | ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); |
2779 | ||
2780 | if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { | |
2781 | ||
2782 | vdev_queue_io_done(zio); | |
2783 | ||
2784 | if (zio->io_type == ZIO_TYPE_WRITE) | |
2785 | vdev_cache_write(zio); | |
2786 | ||
2787 | if (zio_injection_enabled && zio->io_error == 0) | |
9babb374 BB |
2788 | zio->io_error = zio_handle_device_injection(vd, |
2789 | zio, EIO); | |
b128c09f BB |
2790 | |
2791 | if (zio_injection_enabled && zio->io_error == 0) | |
2792 | zio->io_error = zio_handle_label_injection(zio, EIO); | |
2793 | ||
2794 | if (zio->io_error) { | |
2795 | if (!vdev_accessible(vd, zio)) { | |
2e528b49 | 2796 | zio->io_error = SET_ERROR(ENXIO); |
b128c09f BB |
2797 | } else { |
2798 | unexpected_error = B_TRUE; | |
2799 | } | |
2800 | } | |
2801 | } | |
2802 | ||
2803 | ops->vdev_op_io_done(zio); | |
34dc7c2f | 2804 | |
b128c09f | 2805 | if (unexpected_error) |
d164b209 | 2806 | VERIFY(vdev_probe(vd, zio) == NULL); |
34dc7c2f | 2807 | |
b128c09f | 2808 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
2809 | } |
2810 | ||
428870ff BB |
2811 | /* |
2812 | * For non-raidz ZIOs, we can just copy aside the bad data read from the | |
2813 | * disk, and use that to finish the checksum ereport later. | |
2814 | */ | |
2815 | static void | |
2816 | zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, | |
2817 | const void *good_buf) | |
2818 | { | |
2819 | /* no processing needed */ | |
2820 | zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); | |
2821 | } | |
2822 | ||
2823 | /*ARGSUSED*/ | |
2824 | void | |
2825 | zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) | |
2826 | { | |
2827 | void *buf = zio_buf_alloc(zio->io_size); | |
2828 | ||
2829 | bcopy(zio->io_data, buf, zio->io_size); | |
2830 | ||
2831 | zcr->zcr_cbinfo = zio->io_size; | |
2832 | zcr->zcr_cbdata = buf; | |
2833 | zcr->zcr_finish = zio_vsd_default_cksum_finish; | |
2834 | zcr->zcr_free = zio_buf_free; | |
2835 | } | |
2836 | ||
34dc7c2f BB |
2837 | static int |
2838 | zio_vdev_io_assess(zio_t *zio) | |
2839 | { | |
2840 | vdev_t *vd = zio->io_vd; | |
b128c09f BB |
2841 | |
2842 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) | |
2843 | return (ZIO_PIPELINE_STOP); | |
2844 | ||
2845 | if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) | |
2846 | spa_config_exit(zio->io_spa, SCL_ZIO, zio); | |
2847 | ||
2848 | if (zio->io_vsd != NULL) { | |
428870ff | 2849 | zio->io_vsd_ops->vsd_free(zio); |
b128c09f | 2850 | zio->io_vsd = NULL; |
34dc7c2f BB |
2851 | } |
2852 | ||
b128c09f | 2853 | if (zio_injection_enabled && zio->io_error == 0) |
34dc7c2f BB |
2854 | zio->io_error = zio_handle_fault_injection(zio, EIO); |
2855 | ||
2856 | /* | |
2857 | * If the I/O failed, determine whether we should attempt to retry it. | |
428870ff BB |
2858 | * |
2859 | * On retry, we cut in line in the issue queue, since we don't want | |
2860 | * compression/checksumming/etc. work to prevent our (cheap) IO reissue. | |
34dc7c2f | 2861 | */ |
b128c09f BB |
2862 | if (zio->io_error && vd == NULL && |
2863 | !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { | |
2864 | ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ | |
2865 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ | |
34dc7c2f | 2866 | zio->io_error = 0; |
b128c09f BB |
2867 | zio->io_flags |= ZIO_FLAG_IO_RETRY | |
2868 | ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; | |
428870ff BB |
2869 | zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; |
2870 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, | |
2871 | zio_requeue_io_start_cut_in_line); | |
b128c09f | 2872 | return (ZIO_PIPELINE_STOP); |
34dc7c2f BB |
2873 | } |
2874 | ||
b128c09f BB |
2875 | /* |
2876 | * If we got an error on a leaf device, convert it to ENXIO | |
2877 | * if the device is not accessible at all. | |
2878 | */ | |
2879 | if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && | |
2880 | !vdev_accessible(vd, zio)) | |
2e528b49 | 2881 | zio->io_error = SET_ERROR(ENXIO); |
b128c09f BB |
2882 | |
2883 | /* | |
2884 | * If we can't write to an interior vdev (mirror or RAID-Z), | |
2885 | * set vdev_cant_write so that we stop trying to allocate from it. | |
2886 | */ | |
2887 | if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && | |
13fe0198 | 2888 | vd != NULL && !vd->vdev_ops->vdev_op_leaf) { |
b128c09f | 2889 | vd->vdev_cant_write = B_TRUE; |
13fe0198 | 2890 | } |
b128c09f BB |
2891 | |
2892 | if (zio->io_error) | |
2893 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
2894 | ||
e8b96c60 MA |
2895 | if (vd != NULL && vd->vdev_ops->vdev_op_leaf && |
2896 | zio->io_physdone != NULL) { | |
2897 | ASSERT(!(zio->io_flags & ZIO_FLAG_DELEGATED)); | |
2898 | ASSERT(zio->io_child_type == ZIO_CHILD_VDEV); | |
2899 | zio->io_physdone(zio->io_logical); | |
2900 | } | |
2901 | ||
34dc7c2f BB |
2902 | return (ZIO_PIPELINE_CONTINUE); |
2903 | } | |
2904 | ||
2905 | void | |
2906 | zio_vdev_io_reissue(zio_t *zio) | |
2907 | { | |
2908 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); | |
2909 | ASSERT(zio->io_error == 0); | |
2910 | ||
428870ff | 2911 | zio->io_stage >>= 1; |
34dc7c2f BB |
2912 | } |
2913 | ||
2914 | void | |
2915 | zio_vdev_io_redone(zio_t *zio) | |
2916 | { | |
2917 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); | |
2918 | ||
428870ff | 2919 | zio->io_stage >>= 1; |
34dc7c2f BB |
2920 | } |
2921 | ||
2922 | void | |
2923 | zio_vdev_io_bypass(zio_t *zio) | |
2924 | { | |
2925 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); | |
2926 | ASSERT(zio->io_error == 0); | |
2927 | ||
2928 | zio->io_flags |= ZIO_FLAG_IO_BYPASS; | |
428870ff | 2929 | zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; |
34dc7c2f BB |
2930 | } |
2931 | ||
2932 | /* | |
2933 | * ========================================================================== | |
2934 | * Generate and verify checksums | |
2935 | * ========================================================================== | |
2936 | */ | |
2937 | static int | |
2938 | zio_checksum_generate(zio_t *zio) | |
2939 | { | |
34dc7c2f | 2940 | blkptr_t *bp = zio->io_bp; |
b128c09f | 2941 | enum zio_checksum checksum; |
34dc7c2f | 2942 | |
b128c09f BB |
2943 | if (bp == NULL) { |
2944 | /* | |
2945 | * This is zio_write_phys(). | |
2946 | * We're either generating a label checksum, or none at all. | |
2947 | */ | |
2948 | checksum = zio->io_prop.zp_checksum; | |
34dc7c2f | 2949 | |
b128c09f BB |
2950 | if (checksum == ZIO_CHECKSUM_OFF) |
2951 | return (ZIO_PIPELINE_CONTINUE); | |
2952 | ||
2953 | ASSERT(checksum == ZIO_CHECKSUM_LABEL); | |
2954 | } else { | |
2955 | if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { | |
2956 | ASSERT(!IO_IS_ALLOCATING(zio)); | |
2957 | checksum = ZIO_CHECKSUM_GANG_HEADER; | |
2958 | } else { | |
2959 | checksum = BP_GET_CHECKSUM(bp); | |
2960 | } | |
2961 | } | |
34dc7c2f | 2962 | |
b128c09f | 2963 | zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); |
34dc7c2f BB |
2964 | |
2965 | return (ZIO_PIPELINE_CONTINUE); | |
2966 | } | |
2967 | ||
2968 | static int | |
b128c09f | 2969 | zio_checksum_verify(zio_t *zio) |
34dc7c2f | 2970 | { |
428870ff | 2971 | zio_bad_cksum_t info; |
b128c09f BB |
2972 | blkptr_t *bp = zio->io_bp; |
2973 | int error; | |
34dc7c2f | 2974 | |
428870ff BB |
2975 | ASSERT(zio->io_vd != NULL); |
2976 | ||
b128c09f BB |
2977 | if (bp == NULL) { |
2978 | /* | |
2979 | * This is zio_read_phys(). | |
2980 | * We're either verifying a label checksum, or nothing at all. | |
2981 | */ | |
2982 | if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) | |
2983 | return (ZIO_PIPELINE_CONTINUE); | |
34dc7c2f | 2984 | |
b128c09f BB |
2985 | ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); |
2986 | } | |
34dc7c2f | 2987 | |
428870ff | 2988 | if ((error = zio_checksum_error(zio, &info)) != 0) { |
b128c09f | 2989 | zio->io_error = error; |
7a3066ff MA |
2990 | if (error == ECKSUM && |
2991 | !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { | |
428870ff BB |
2992 | zfs_ereport_start_checksum(zio->io_spa, |
2993 | zio->io_vd, zio, zio->io_offset, | |
2994 | zio->io_size, NULL, &info); | |
b128c09f | 2995 | } |
34dc7c2f BB |
2996 | } |
2997 | ||
2998 | return (ZIO_PIPELINE_CONTINUE); | |
2999 | } | |
3000 | ||
3001 | /* | |
3002 | * Called by RAID-Z to ensure we don't compute the checksum twice. | |
3003 | */ | |
3004 | void | |
3005 | zio_checksum_verified(zio_t *zio) | |
3006 | { | |
428870ff | 3007 | zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; |
34dc7c2f BB |
3008 | } |
3009 | ||
3010 | /* | |
b128c09f BB |
3011 | * ========================================================================== |
3012 | * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. | |
9b67f605 | 3013 | * An error of 0 indicates success. ENXIO indicates whole-device failure, |
b128c09f BB |
3014 | * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO |
3015 | * indicate errors that are specific to one I/O, and most likely permanent. | |
3016 | * Any other error is presumed to be worse because we weren't expecting it. | |
3017 | * ========================================================================== | |
34dc7c2f | 3018 | */ |
b128c09f BB |
3019 | int |
3020 | zio_worst_error(int e1, int e2) | |
34dc7c2f | 3021 | { |
b128c09f BB |
3022 | static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; |
3023 | int r1, r2; | |
3024 | ||
3025 | for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) | |
3026 | if (e1 == zio_error_rank[r1]) | |
3027 | break; | |
34dc7c2f | 3028 | |
b128c09f BB |
3029 | for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) |
3030 | if (e2 == zio_error_rank[r2]) | |
3031 | break; | |
3032 | ||
3033 | return (r1 > r2 ? e1 : e2); | |
34dc7c2f BB |
3034 | } |
3035 | ||
3036 | /* | |
3037 | * ========================================================================== | |
b128c09f | 3038 | * I/O completion |
34dc7c2f BB |
3039 | * ========================================================================== |
3040 | */ | |
b128c09f BB |
3041 | static int |
3042 | zio_ready(zio_t *zio) | |
34dc7c2f | 3043 | { |
b128c09f | 3044 | blkptr_t *bp = zio->io_bp; |
d164b209 | 3045 | zio_t *pio, *pio_next; |
34dc7c2f | 3046 | |
428870ff BB |
3047 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || |
3048 | zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_READY)) | |
9babb374 | 3049 | return (ZIO_PIPELINE_STOP); |
34dc7c2f | 3050 | |
9babb374 | 3051 | if (zio->io_ready) { |
b128c09f | 3052 | ASSERT(IO_IS_ALLOCATING(zio)); |
03c6040b GW |
3053 | ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp) || |
3054 | (zio->io_flags & ZIO_FLAG_NOPWRITE)); | |
b128c09f | 3055 | ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); |
34dc7c2f | 3056 | |
b128c09f BB |
3057 | zio->io_ready(zio); |
3058 | } | |
34dc7c2f | 3059 | |
b128c09f BB |
3060 | if (bp != NULL && bp != &zio->io_bp_copy) |
3061 | zio->io_bp_copy = *bp; | |
34dc7c2f | 3062 | |
b128c09f BB |
3063 | if (zio->io_error) |
3064 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
34dc7c2f | 3065 | |
d164b209 BB |
3066 | mutex_enter(&zio->io_lock); |
3067 | zio->io_state[ZIO_WAIT_READY] = 1; | |
3068 | pio = zio_walk_parents(zio); | |
3069 | mutex_exit(&zio->io_lock); | |
3070 | ||
3071 | /* | |
3072 | * As we notify zio's parents, new parents could be added. | |
3073 | * New parents go to the head of zio's io_parent_list, however, | |
3074 | * so we will (correctly) not notify them. The remainder of zio's | |
3075 | * io_parent_list, from 'pio_next' onward, cannot change because | |
3076 | * all parents must wait for us to be done before they can be done. | |
3077 | */ | |
3078 | for (; pio != NULL; pio = pio_next) { | |
3079 | pio_next = zio_walk_parents(zio); | |
b128c09f | 3080 | zio_notify_parent(pio, zio, ZIO_WAIT_READY); |
d164b209 | 3081 | } |
34dc7c2f | 3082 | |
428870ff BB |
3083 | if (zio->io_flags & ZIO_FLAG_NODATA) { |
3084 | if (BP_IS_GANG(bp)) { | |
3085 | zio->io_flags &= ~ZIO_FLAG_NODATA; | |
3086 | } else { | |
3087 | ASSERT((uintptr_t)zio->io_data < SPA_MAXBLOCKSIZE); | |
3088 | zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; | |
3089 | } | |
3090 | } | |
3091 | ||
3092 | if (zio_injection_enabled && | |
3093 | zio->io_spa->spa_syncing_txg == zio->io_txg) | |
3094 | zio_handle_ignored_writes(zio); | |
3095 | ||
b128c09f | 3096 | return (ZIO_PIPELINE_CONTINUE); |
34dc7c2f BB |
3097 | } |
3098 | ||
b128c09f BB |
3099 | static int |
3100 | zio_done(zio_t *zio) | |
34dc7c2f | 3101 | { |
d164b209 | 3102 | zio_t *pio, *pio_next; |
d6320ddb | 3103 | int c, w; |
34dc7c2f | 3104 | |
b128c09f | 3105 | /* |
9babb374 | 3106 | * If our children haven't all completed, |
b128c09f BB |
3107 | * wait for them and then repeat this pipeline stage. |
3108 | */ | |
3109 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || | |
3110 | zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || | |
428870ff | 3111 | zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE) || |
b128c09f BB |
3112 | zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) |
3113 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f | 3114 | |
d6320ddb BB |
3115 | for (c = 0; c < ZIO_CHILD_TYPES; c++) |
3116 | for (w = 0; w < ZIO_WAIT_TYPES; w++) | |
b128c09f BB |
3117 | ASSERT(zio->io_children[c][w] == 0); |
3118 | ||
9b67f605 | 3119 | if (zio->io_bp != NULL && !BP_IS_EMBEDDED(zio->io_bp)) { |
c776b317 BB |
3120 | ASSERT(zio->io_bp->blk_pad[0] == 0); |
3121 | ASSERT(zio->io_bp->blk_pad[1] == 0); | |
d1d7e268 MK |
3122 | ASSERT(bcmp(zio->io_bp, &zio->io_bp_copy, |
3123 | sizeof (blkptr_t)) == 0 || | |
c776b317 BB |
3124 | (zio->io_bp == zio_unique_parent(zio)->io_bp)); |
3125 | if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(zio->io_bp) && | |
428870ff | 3126 | zio->io_bp_override == NULL && |
b128c09f | 3127 | !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { |
c776b317 | 3128 | ASSERT(!BP_SHOULD_BYTESWAP(zio->io_bp)); |
d1d7e268 MK |
3129 | ASSERT3U(zio->io_prop.zp_copies, <=, |
3130 | BP_GET_NDVAS(zio->io_bp)); | |
c776b317 | 3131 | ASSERT(BP_COUNT_GANG(zio->io_bp) == 0 || |
d1d7e268 MK |
3132 | (BP_COUNT_GANG(zio->io_bp) == |
3133 | BP_GET_NDVAS(zio->io_bp))); | |
b128c09f | 3134 | } |
03c6040b GW |
3135 | if (zio->io_flags & ZIO_FLAG_NOPWRITE) |
3136 | VERIFY(BP_EQUAL(zio->io_bp, &zio->io_bp_orig)); | |
b128c09f BB |
3137 | } |
3138 | ||
3139 | /* | |
428870ff | 3140 | * If there were child vdev/gang/ddt errors, they apply to us now. |
b128c09f BB |
3141 | */ |
3142 | zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); | |
3143 | zio_inherit_child_errors(zio, ZIO_CHILD_GANG); | |
428870ff BB |
3144 | zio_inherit_child_errors(zio, ZIO_CHILD_DDT); |
3145 | ||
3146 | /* | |
3147 | * If the I/O on the transformed data was successful, generate any | |
3148 | * checksum reports now while we still have the transformed data. | |
3149 | */ | |
3150 | if (zio->io_error == 0) { | |
3151 | while (zio->io_cksum_report != NULL) { | |
3152 | zio_cksum_report_t *zcr = zio->io_cksum_report; | |
3153 | uint64_t align = zcr->zcr_align; | |
c776b317 | 3154 | uint64_t asize = P2ROUNDUP(zio->io_size, align); |
428870ff BB |
3155 | char *abuf = zio->io_data; |
3156 | ||
c776b317 | 3157 | if (asize != zio->io_size) { |
428870ff | 3158 | abuf = zio_buf_alloc(asize); |
c776b317 | 3159 | bcopy(zio->io_data, abuf, zio->io_size); |
d1d7e268 | 3160 | bzero(abuf+zio->io_size, asize-zio->io_size); |
428870ff BB |
3161 | } |
3162 | ||
3163 | zio->io_cksum_report = zcr->zcr_next; | |
3164 | zcr->zcr_next = NULL; | |
3165 | zcr->zcr_finish(zcr, abuf); | |
3166 | zfs_ereport_free_checksum(zcr); | |
3167 | ||
c776b317 | 3168 | if (asize != zio->io_size) |
428870ff BB |
3169 | zio_buf_free(abuf, asize); |
3170 | } | |
3171 | } | |
b128c09f BB |
3172 | |
3173 | zio_pop_transforms(zio); /* note: may set zio->io_error */ | |
3174 | ||
c776b317 | 3175 | vdev_stat_update(zio, zio->io_size); |
b128c09f | 3176 | |
a69052be | 3177 | /* |
cc92e9d0 | 3178 | * If this I/O is attached to a particular vdev is slow, exceeding |
72f53c56 MJ |
3179 | * 30 seconds to complete, post an error described the I/O delay. |
3180 | * We ignore these errors if the device is currently unavailable. | |
a69052be | 3181 | */ |
cc92e9d0 | 3182 | if (zio->io_delay >= MSEC_TO_TICK(zio_delay_max)) { |
72f53c56 MJ |
3183 | if (zio->io_vd != NULL && !vdev_is_dead(zio->io_vd)) |
3184 | zfs_ereport_post(FM_EREPORT_ZFS_DELAY, zio->io_spa, | |
d1d7e268 | 3185 | zio->io_vd, zio, 0, 0); |
72f53c56 | 3186 | } |
a69052be | 3187 | |
b128c09f BB |
3188 | if (zio->io_error) { |
3189 | /* | |
3190 | * If this I/O is attached to a particular vdev, | |
3191 | * generate an error message describing the I/O failure | |
3192 | * at the block level. We ignore these errors if the | |
3193 | * device is currently unavailable. | |
3194 | */ | |
c776b317 BB |
3195 | if (zio->io_error != ECKSUM && zio->io_vd != NULL && |
3196 | !vdev_is_dead(zio->io_vd)) | |
3197 | zfs_ereport_post(FM_EREPORT_ZFS_IO, zio->io_spa, | |
3198 | zio->io_vd, zio, 0, 0); | |
34dc7c2f | 3199 | |
428870ff BB |
3200 | if ((zio->io_error == EIO || !(zio->io_flags & |
3201 | (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && | |
c776b317 | 3202 | zio == zio->io_logical) { |
b128c09f BB |
3203 | /* |
3204 | * For logical I/O requests, tell the SPA to log the | |
3205 | * error and generate a logical data ereport. | |
3206 | */ | |
c776b317 | 3207 | spa_log_error(zio->io_spa, zio); |
d1d7e268 MK |
3208 | zfs_ereport_post(FM_EREPORT_ZFS_DATA, zio->io_spa, |
3209 | NULL, zio, 0, 0); | |
b128c09f BB |
3210 | } |
3211 | } | |
34dc7c2f | 3212 | |
c776b317 | 3213 | if (zio->io_error && zio == zio->io_logical) { |
b128c09f BB |
3214 | /* |
3215 | * Determine whether zio should be reexecuted. This will | |
3216 | * propagate all the way to the root via zio_notify_parent(). | |
3217 | */ | |
c776b317 | 3218 | ASSERT(zio->io_vd == NULL && zio->io_bp != NULL); |
428870ff | 3219 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); |
b128c09f | 3220 | |
428870ff BB |
3221 | if (IO_IS_ALLOCATING(zio) && |
3222 | !(zio->io_flags & ZIO_FLAG_CANFAIL)) { | |
b128c09f BB |
3223 | if (zio->io_error != ENOSPC) |
3224 | zio->io_reexecute |= ZIO_REEXECUTE_NOW; | |
3225 | else | |
3226 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
428870ff | 3227 | } |
b128c09f BB |
3228 | |
3229 | if ((zio->io_type == ZIO_TYPE_READ || | |
3230 | zio->io_type == ZIO_TYPE_FREE) && | |
572e2857 | 3231 | !(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && |
b128c09f | 3232 | zio->io_error == ENXIO && |
c776b317 BB |
3233 | spa_load_state(zio->io_spa) == SPA_LOAD_NONE && |
3234 | spa_get_failmode(zio->io_spa) != ZIO_FAILURE_MODE_CONTINUE) | |
b128c09f BB |
3235 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; |
3236 | ||
3237 | if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) | |
3238 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
428870ff BB |
3239 | |
3240 | /* | |
3241 | * Here is a possibly good place to attempt to do | |
3242 | * either combinatorial reconstruction or error correction | |
3243 | * based on checksums. It also might be a good place | |
3244 | * to send out preliminary ereports before we suspend | |
3245 | * processing. | |
3246 | */ | |
34dc7c2f BB |
3247 | } |
3248 | ||
3249 | /* | |
b128c09f BB |
3250 | * If there were logical child errors, they apply to us now. |
3251 | * We defer this until now to avoid conflating logical child | |
3252 | * errors with errors that happened to the zio itself when | |
3253 | * updating vdev stats and reporting FMA events above. | |
34dc7c2f | 3254 | */ |
b128c09f | 3255 | zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); |
34dc7c2f | 3256 | |
428870ff BB |
3257 | if ((zio->io_error || zio->io_reexecute) && |
3258 | IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && | |
03c6040b | 3259 | !(zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE))) |
c776b317 | 3260 | zio_dva_unallocate(zio, zio->io_gang_tree, zio->io_bp); |
9babb374 BB |
3261 | |
3262 | zio_gang_tree_free(&zio->io_gang_tree); | |
3263 | ||
3264 | /* | |
3265 | * Godfather I/Os should never suspend. | |
3266 | */ | |
3267 | if ((zio->io_flags & ZIO_FLAG_GODFATHER) && | |
3268 | (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) | |
3269 | zio->io_reexecute = 0; | |
3270 | ||
b128c09f BB |
3271 | if (zio->io_reexecute) { |
3272 | /* | |
3273 | * This is a logical I/O that wants to reexecute. | |
3274 | * | |
3275 | * Reexecute is top-down. When an i/o fails, if it's not | |
3276 | * the root, it simply notifies its parent and sticks around. | |
3277 | * The parent, seeing that it still has children in zio_done(), | |
3278 | * does the same. This percolates all the way up to the root. | |
3279 | * The root i/o will reexecute or suspend the entire tree. | |
3280 | * | |
3281 | * This approach ensures that zio_reexecute() honors | |
3282 | * all the original i/o dependency relationships, e.g. | |
3283 | * parents not executing until children are ready. | |
3284 | */ | |
3285 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
34dc7c2f | 3286 | |
9babb374 | 3287 | zio->io_gang_leader = NULL; |
b128c09f | 3288 | |
d164b209 BB |
3289 | mutex_enter(&zio->io_lock); |
3290 | zio->io_state[ZIO_WAIT_DONE] = 1; | |
3291 | mutex_exit(&zio->io_lock); | |
3292 | ||
9babb374 BB |
3293 | /* |
3294 | * "The Godfather" I/O monitors its children but is | |
3295 | * not a true parent to them. It will track them through | |
3296 | * the pipeline but severs its ties whenever they get into | |
3297 | * trouble (e.g. suspended). This allows "The Godfather" | |
3298 | * I/O to return status without blocking. | |
3299 | */ | |
3300 | for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { | |
3301 | zio_link_t *zl = zio->io_walk_link; | |
3302 | pio_next = zio_walk_parents(zio); | |
3303 | ||
3304 | if ((pio->io_flags & ZIO_FLAG_GODFATHER) && | |
3305 | (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { | |
3306 | zio_remove_child(pio, zio, zl); | |
3307 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); | |
3308 | } | |
3309 | } | |
3310 | ||
d164b209 | 3311 | if ((pio = zio_unique_parent(zio)) != NULL) { |
b128c09f BB |
3312 | /* |
3313 | * We're not a root i/o, so there's nothing to do | |
3314 | * but notify our parent. Don't propagate errors | |
3315 | * upward since we haven't permanently failed yet. | |
3316 | */ | |
9babb374 | 3317 | ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); |
b128c09f BB |
3318 | zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; |
3319 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); | |
3320 | } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { | |
3321 | /* | |
3322 | * We'd fail again if we reexecuted now, so suspend | |
3323 | * until conditions improve (e.g. device comes online). | |
3324 | */ | |
c776b317 | 3325 | zio_suspend(zio->io_spa, zio); |
b128c09f BB |
3326 | } else { |
3327 | /* | |
3328 | * Reexecution is potentially a huge amount of work. | |
3329 | * Hand it off to the otherwise-unused claim taskq. | |
3330 | */ | |
a38718a6 | 3331 | ASSERT(taskq_empty_ent(&zio->io_tqent)); |
7ef5e54e AL |
3332 | spa_taskq_dispatch_ent(zio->io_spa, |
3333 | ZIO_TYPE_CLAIM, ZIO_TASKQ_ISSUE, | |
a38718a6 GA |
3334 | (task_func_t *)zio_reexecute, zio, 0, |
3335 | &zio->io_tqent); | |
b128c09f BB |
3336 | } |
3337 | return (ZIO_PIPELINE_STOP); | |
34dc7c2f BB |
3338 | } |
3339 | ||
428870ff | 3340 | ASSERT(zio->io_child_count == 0); |
b128c09f BB |
3341 | ASSERT(zio->io_reexecute == 0); |
3342 | ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); | |
34dc7c2f | 3343 | |
428870ff BB |
3344 | /* |
3345 | * Report any checksum errors, since the I/O is complete. | |
3346 | */ | |
3347 | while (zio->io_cksum_report != NULL) { | |
3348 | zio_cksum_report_t *zcr = zio->io_cksum_report; | |
3349 | zio->io_cksum_report = zcr->zcr_next; | |
3350 | zcr->zcr_next = NULL; | |
3351 | zcr->zcr_finish(zcr, NULL); | |
3352 | zfs_ereport_free_checksum(zcr); | |
3353 | } | |
3354 | ||
920dd524 | 3355 | if (zio->io_flags & ZIO_FLAG_FASTWRITE && zio->io_bp && |
9b67f605 MA |
3356 | !BP_IS_HOLE(zio->io_bp) && !BP_IS_EMBEDDED(zio->io_bp) && |
3357 | !(zio->io_flags & ZIO_FLAG_NOPWRITE)) { | |
920dd524 ED |
3358 | metaslab_fastwrite_unmark(zio->io_spa, zio->io_bp); |
3359 | } | |
3360 | ||
d164b209 BB |
3361 | /* |
3362 | * It is the responsibility of the done callback to ensure that this | |
3363 | * particular zio is no longer discoverable for adoption, and as | |
3364 | * such, cannot acquire any new parents. | |
3365 | */ | |
b128c09f BB |
3366 | if (zio->io_done) |
3367 | zio->io_done(zio); | |
34dc7c2f | 3368 | |
d164b209 BB |
3369 | mutex_enter(&zio->io_lock); |
3370 | zio->io_state[ZIO_WAIT_DONE] = 1; | |
3371 | mutex_exit(&zio->io_lock); | |
34dc7c2f | 3372 | |
d164b209 BB |
3373 | for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { |
3374 | zio_link_t *zl = zio->io_walk_link; | |
3375 | pio_next = zio_walk_parents(zio); | |
3376 | zio_remove_child(pio, zio, zl); | |
b128c09f BB |
3377 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE); |
3378 | } | |
34dc7c2f | 3379 | |
b128c09f BB |
3380 | if (zio->io_waiter != NULL) { |
3381 | mutex_enter(&zio->io_lock); | |
3382 | zio->io_executor = NULL; | |
3383 | cv_broadcast(&zio->io_cv); | |
3384 | mutex_exit(&zio->io_lock); | |
3385 | } else { | |
3386 | zio_destroy(zio); | |
3387 | } | |
34dc7c2f | 3388 | |
b128c09f | 3389 | return (ZIO_PIPELINE_STOP); |
34dc7c2f BB |
3390 | } |
3391 | ||
3392 | /* | |
b128c09f BB |
3393 | * ========================================================================== |
3394 | * I/O pipeline definition | |
3395 | * ========================================================================== | |
34dc7c2f | 3396 | */ |
428870ff | 3397 | static zio_pipe_stage_t *zio_pipeline[] = { |
b128c09f | 3398 | NULL, |
b128c09f | 3399 | zio_read_bp_init, |
428870ff BB |
3400 | zio_free_bp_init, |
3401 | zio_issue_async, | |
b128c09f BB |
3402 | zio_write_bp_init, |
3403 | zio_checksum_generate, | |
03c6040b | 3404 | zio_nop_write, |
428870ff BB |
3405 | zio_ddt_read_start, |
3406 | zio_ddt_read_done, | |
3407 | zio_ddt_write, | |
3408 | zio_ddt_free, | |
b128c09f BB |
3409 | zio_gang_assemble, |
3410 | zio_gang_issue, | |
3411 | zio_dva_allocate, | |
3412 | zio_dva_free, | |
3413 | zio_dva_claim, | |
3414 | zio_ready, | |
3415 | zio_vdev_io_start, | |
3416 | zio_vdev_io_done, | |
3417 | zio_vdev_io_assess, | |
3418 | zio_checksum_verify, | |
3419 | zio_done | |
3420 | }; | |
c28b2279 | 3421 | |
9ae529ec CS |
3422 | /* dnp is the dnode for zb1->zb_object */ |
3423 | boolean_t | |
5dbd68a3 MA |
3424 | zbookmark_is_before(const dnode_phys_t *dnp, const zbookmark_phys_t *zb1, |
3425 | const zbookmark_phys_t *zb2) | |
9ae529ec CS |
3426 | { |
3427 | uint64_t zb1nextL0, zb2thisobj; | |
3428 | ||
3429 | ASSERT(zb1->zb_objset == zb2->zb_objset); | |
3430 | ASSERT(zb2->zb_level == 0); | |
3431 | ||
9ae529ec CS |
3432 | /* The objset_phys_t isn't before anything. */ |
3433 | if (dnp == NULL) | |
3434 | return (B_FALSE); | |
3435 | ||
3436 | zb1nextL0 = (zb1->zb_blkid + 1) << | |
3437 | ((zb1->zb_level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)); | |
3438 | ||
3439 | zb2thisobj = zb2->zb_object ? zb2->zb_object : | |
3440 | zb2->zb_blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT); | |
3441 | ||
3442 | if (zb1->zb_object == DMU_META_DNODE_OBJECT) { | |
3443 | uint64_t nextobj = zb1nextL0 * | |
3444 | (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT) >> DNODE_SHIFT; | |
3445 | return (nextobj <= zb2thisobj); | |
3446 | } | |
3447 | ||
3448 | if (zb1->zb_object < zb2thisobj) | |
3449 | return (B_TRUE); | |
3450 | if (zb1->zb_object > zb2thisobj) | |
3451 | return (B_FALSE); | |
3452 | if (zb2->zb_object == DMU_META_DNODE_OBJECT) | |
3453 | return (B_FALSE); | |
3454 | return (zb1nextL0 <= zb2->zb_blkid); | |
3455 | } | |
3456 | ||
c28b2279 | 3457 | #if defined(_KERNEL) && defined(HAVE_SPL) |
c28b2279 | 3458 | EXPORT_SYMBOL(zio_type_name); |
81971b13 BB |
3459 | EXPORT_SYMBOL(zio_buf_alloc); |
3460 | EXPORT_SYMBOL(zio_data_buf_alloc); | |
3461 | EXPORT_SYMBOL(zio_buf_free); | |
3462 | EXPORT_SYMBOL(zio_data_buf_free); | |
c28b2279 | 3463 | |
a69052be | 3464 | module_param(zio_delay_max, int, 0644); |
c409e464 BB |
3465 | MODULE_PARM_DESC(zio_delay_max, "Max zio millisec delay before posting event"); |
3466 | ||
3467 | module_param(zio_requeue_io_start_cut_in_line, int, 0644); | |
3468 | MODULE_PARM_DESC(zio_requeue_io_start_cut_in_line, "Prioritize requeued I/O"); | |
29dee3ee CP |
3469 | |
3470 | module_param(zfs_sync_pass_deferred_free, int, 0644); | |
3471 | MODULE_PARM_DESC(zfs_sync_pass_deferred_free, | |
d1d7e268 | 3472 | "Defer frees starting in this pass"); |
29dee3ee CP |
3473 | |
3474 | module_param(zfs_sync_pass_dont_compress, int, 0644); | |
3475 | MODULE_PARM_DESC(zfs_sync_pass_dont_compress, | |
d1d7e268 | 3476 | "Don't compress starting in this pass"); |
29dee3ee CP |
3477 | |
3478 | module_param(zfs_sync_pass_rewrite, int, 0644); | |
3479 | MODULE_PARM_DESC(zfs_sync_pass_rewrite, | |
d1d7e268 | 3480 | "Rewrite new bps starting in this pass"); |
c28b2279 | 3481 | #endif |