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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. |
492f64e9 | 23 | * Copyright (c) 2011, 2018 by Delphix. All rights reserved. |
a38718a6 | 24 | * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved. |
cc99f275 | 25 | * Copyright (c) 2017, Intel Corporation. |
34dc7c2f BB |
26 | */ |
27 | ||
f1512ee6 | 28 | #include <sys/sysmacros.h> |
34dc7c2f BB |
29 | #include <sys/zfs_context.h> |
30 | #include <sys/fm/fs/zfs.h> | |
31 | #include <sys/spa.h> | |
32 | #include <sys/txg.h> | |
33 | #include <sys/spa_impl.h> | |
34 | #include <sys/vdev_impl.h> | |
35 | #include <sys/zio_impl.h> | |
36 | #include <sys/zio_compress.h> | |
37 | #include <sys/zio_checksum.h> | |
428870ff BB |
38 | #include <sys/dmu_objset.h> |
39 | #include <sys/arc.h> | |
40 | #include <sys/ddt.h> | |
9b67f605 | 41 | #include <sys/blkptr.h> |
b0bc7a84 | 42 | #include <sys/zfeature.h> |
d4a72f23 | 43 | #include <sys/dsl_scan.h> |
3dfb57a3 | 44 | #include <sys/metaslab_impl.h> |
193a37cb | 45 | #include <sys/time.h> |
26ef0cc7 | 46 | #include <sys/trace_zio.h> |
a6255b7f | 47 | #include <sys/abd.h> |
b5256303 | 48 | #include <sys/dsl_crypt.h> |
492f64e9 | 49 | #include <sys/cityhash.h> |
34dc7c2f | 50 | |
34dc7c2f BB |
51 | /* |
52 | * ========================================================================== | |
53 | * I/O type descriptions | |
54 | * ========================================================================== | |
55 | */ | |
e8b96c60 | 56 | const char *zio_type_name[ZIO_TYPES] = { |
3dfb57a3 DB |
57 | /* |
58 | * Note: Linux kernel thread name length is limited | |
59 | * so these names will differ from upstream open zfs. | |
60 | */ | |
451041db | 61 | "z_null", "z_rd", "z_wr", "z_fr", "z_cl", "z_ioctl" |
428870ff | 62 | }; |
34dc7c2f | 63 | |
27f2b90d | 64 | int zio_dva_throttle_enabled = B_TRUE; |
638dd5f4 | 65 | int zio_deadman_log_all = B_FALSE; |
3dfb57a3 | 66 | |
34dc7c2f BB |
67 | /* |
68 | * ========================================================================== | |
69 | * I/O kmem caches | |
70 | * ========================================================================== | |
71 | */ | |
72 | kmem_cache_t *zio_cache; | |
d164b209 | 73 | kmem_cache_t *zio_link_cache; |
34dc7c2f BB |
74 | kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; |
75 | kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; | |
a6255b7f DQ |
76 | #if defined(ZFS_DEBUG) && !defined(_KERNEL) |
77 | uint64_t zio_buf_cache_allocs[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; | |
78 | uint64_t zio_buf_cache_frees[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; | |
79 | #endif | |
80 | ||
ad796b8a TH |
81 | /* Mark IOs as "slow" if they take longer than 30 seconds */ |
82 | int zio_slow_io_ms = (30 * MILLISEC); | |
34dc7c2f | 83 | |
fcff0f35 PD |
84 | #define BP_SPANB(indblkshift, level) \ |
85 | (((uint64_t)1) << ((level) * ((indblkshift) - SPA_BLKPTRSHIFT))) | |
86 | #define COMPARE_META_LEVEL 0x80000000ul | |
55d85d5a GW |
87 | /* |
88 | * The following actions directly effect the spa's sync-to-convergence logic. | |
89 | * The values below define the sync pass when we start performing the action. | |
90 | * Care should be taken when changing these values as they directly impact | |
91 | * spa_sync() performance. Tuning these values may introduce subtle performance | |
92 | * pathologies and should only be done in the context of performance analysis. | |
93 | * These tunables will eventually be removed and replaced with #defines once | |
94 | * enough analysis has been done to determine optimal values. | |
95 | * | |
96 | * The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that | |
97 | * regular blocks are not deferred. | |
98 | */ | |
99 | int zfs_sync_pass_deferred_free = 2; /* defer frees starting in this pass */ | |
100 | int zfs_sync_pass_dont_compress = 5; /* don't compress starting in this pass */ | |
101 | int zfs_sync_pass_rewrite = 2; /* rewrite new bps starting in this pass */ | |
102 | ||
34dc7c2f | 103 | /* |
b128c09f BB |
104 | * An allocating zio is one that either currently has the DVA allocate |
105 | * stage set or will have it later in its lifetime. | |
34dc7c2f | 106 | */ |
428870ff BB |
107 | #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) |
108 | ||
c409e464 | 109 | int zio_requeue_io_start_cut_in_line = 1; |
428870ff BB |
110 | |
111 | #ifdef ZFS_DEBUG | |
112 | int zio_buf_debug_limit = 16384; | |
113 | #else | |
114 | int zio_buf_debug_limit = 0; | |
115 | #endif | |
34dc7c2f | 116 | |
da6b4005 NB |
117 | static inline void __zio_execute(zio_t *zio); |
118 | ||
3dfb57a3 DB |
119 | static void zio_taskq_dispatch(zio_t *, zio_taskq_type_t, boolean_t); |
120 | ||
34dc7c2f BB |
121 | void |
122 | zio_init(void) | |
123 | { | |
124 | size_t c; | |
125 | vmem_t *data_alloc_arena = NULL; | |
126 | ||
3941503c BB |
127 | zio_cache = kmem_cache_create("zio_cache", |
128 | sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); | |
d164b209 | 129 | zio_link_cache = kmem_cache_create("zio_link_cache", |
6795a698 | 130 | sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); |
34dc7c2f BB |
131 | |
132 | /* | |
133 | * For small buffers, we want a cache for each multiple of | |
f1512ee6 MA |
134 | * SPA_MINBLOCKSIZE. For larger buffers, we want a cache |
135 | * for each quarter-power of 2. | |
34dc7c2f BB |
136 | */ |
137 | for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { | |
138 | size_t size = (c + 1) << SPA_MINBLOCKSHIFT; | |
139 | size_t p2 = size; | |
140 | size_t align = 0; | |
6442f3cf | 141 | size_t cflags = (size > zio_buf_debug_limit) ? KMC_NODEBUG : 0; |
34dc7c2f | 142 | |
34328f3c | 143 | #if defined(_ILP32) && defined(_KERNEL) |
f1512ee6 MA |
144 | /* |
145 | * Cache size limited to 1M on 32-bit platforms until ARC | |
146 | * buffers no longer require virtual address space. | |
147 | */ | |
148 | if (size > zfs_max_recordsize) | |
149 | break; | |
150 | #endif | |
151 | ||
152 | while (!ISP2(p2)) | |
34dc7c2f BB |
153 | p2 &= p2 - 1; |
154 | ||
498877ba MA |
155 | #ifndef _KERNEL |
156 | /* | |
157 | * If we are using watchpoints, put each buffer on its own page, | |
158 | * to eliminate the performance overhead of trapping to the | |
159 | * kernel when modifying a non-watched buffer that shares the | |
160 | * page with a watched buffer. | |
161 | */ | |
162 | if (arc_watch && !IS_P2ALIGNED(size, PAGESIZE)) | |
163 | continue; | |
fcf64f45 BB |
164 | /* |
165 | * Here's the problem - on 4K native devices in userland on | |
166 | * Linux using O_DIRECT, buffers must be 4K aligned or I/O | |
167 | * will fail with EINVAL, causing zdb (and others) to coredump. | |
168 | * Since userland probably doesn't need optimized buffer caches, | |
169 | * we just force 4K alignment on everything. | |
170 | */ | |
171 | align = 8 * SPA_MINBLOCKSIZE; | |
172 | #else | |
24fa2034 | 173 | if (size < PAGESIZE) { |
34dc7c2f | 174 | align = SPA_MINBLOCKSIZE; |
498877ba | 175 | } else if (IS_P2ALIGNED(size, p2 >> 2)) { |
24fa2034 | 176 | align = PAGESIZE; |
34dc7c2f | 177 | } |
fcf64f45 | 178 | #endif |
34dc7c2f BB |
179 | |
180 | if (align != 0) { | |
181 | char name[36]; | |
182 | (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); | |
183 | zio_buf_cache[c] = kmem_cache_create(name, size, | |
6442f3cf | 184 | align, NULL, NULL, NULL, NULL, NULL, cflags); |
34dc7c2f BB |
185 | |
186 | (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); | |
187 | zio_data_buf_cache[c] = kmem_cache_create(name, size, | |
ae6ba3db | 188 | align, NULL, NULL, NULL, NULL, |
6442f3cf | 189 | data_alloc_arena, cflags); |
34dc7c2f BB |
190 | } |
191 | } | |
192 | ||
193 | while (--c != 0) { | |
194 | ASSERT(zio_buf_cache[c] != NULL); | |
195 | if (zio_buf_cache[c - 1] == NULL) | |
196 | zio_buf_cache[c - 1] = zio_buf_cache[c]; | |
197 | ||
198 | ASSERT(zio_data_buf_cache[c] != NULL); | |
199 | if (zio_data_buf_cache[c - 1] == NULL) | |
200 | zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; | |
201 | } | |
202 | ||
34dc7c2f | 203 | zio_inject_init(); |
9759c60f ED |
204 | |
205 | lz4_init(); | |
34dc7c2f BB |
206 | } |
207 | ||
208 | void | |
209 | zio_fini(void) | |
210 | { | |
211 | size_t c; | |
212 | kmem_cache_t *last_cache = NULL; | |
213 | kmem_cache_t *last_data_cache = NULL; | |
214 | ||
215 | for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { | |
f1512ee6 MA |
216 | #ifdef _ILP32 |
217 | /* | |
218 | * Cache size limited to 1M on 32-bit platforms until ARC | |
219 | * buffers no longer require virtual address space. | |
220 | */ | |
221 | if (((c + 1) << SPA_MINBLOCKSHIFT) > zfs_max_recordsize) | |
222 | break; | |
a6255b7f DQ |
223 | #endif |
224 | #if defined(ZFS_DEBUG) && !defined(_KERNEL) | |
225 | if (zio_buf_cache_allocs[c] != zio_buf_cache_frees[c]) | |
226 | (void) printf("zio_fini: [%d] %llu != %llu\n", | |
227 | (int)((c + 1) << SPA_MINBLOCKSHIFT), | |
228 | (long long unsigned)zio_buf_cache_allocs[c], | |
229 | (long long unsigned)zio_buf_cache_frees[c]); | |
f1512ee6 | 230 | #endif |
34dc7c2f BB |
231 | if (zio_buf_cache[c] != last_cache) { |
232 | last_cache = zio_buf_cache[c]; | |
233 | kmem_cache_destroy(zio_buf_cache[c]); | |
234 | } | |
235 | zio_buf_cache[c] = NULL; | |
236 | ||
237 | if (zio_data_buf_cache[c] != last_data_cache) { | |
238 | last_data_cache = zio_data_buf_cache[c]; | |
239 | kmem_cache_destroy(zio_data_buf_cache[c]); | |
240 | } | |
241 | zio_data_buf_cache[c] = NULL; | |
242 | } | |
243 | ||
d164b209 | 244 | kmem_cache_destroy(zio_link_cache); |
34dc7c2f BB |
245 | kmem_cache_destroy(zio_cache); |
246 | ||
247 | zio_inject_fini(); | |
9759c60f ED |
248 | |
249 | lz4_fini(); | |
34dc7c2f BB |
250 | } |
251 | ||
252 | /* | |
253 | * ========================================================================== | |
254 | * Allocate and free I/O buffers | |
255 | * ========================================================================== | |
256 | */ | |
257 | ||
258 | /* | |
259 | * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a | |
260 | * crashdump if the kernel panics, so use it judiciously. Obviously, it's | |
261 | * useful to inspect ZFS metadata, but if possible, we should avoid keeping | |
262 | * excess / transient data in-core during a crashdump. | |
263 | */ | |
264 | void * | |
265 | zio_buf_alloc(size_t size) | |
266 | { | |
267 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
268 | ||
63e3a861 | 269 | VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); |
a6255b7f DQ |
270 | #if defined(ZFS_DEBUG) && !defined(_KERNEL) |
271 | atomic_add_64(&zio_buf_cache_allocs[c], 1); | |
272 | #endif | |
34dc7c2f | 273 | |
efcd79a8 | 274 | return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); |
34dc7c2f BB |
275 | } |
276 | ||
277 | /* | |
278 | * Use zio_data_buf_alloc to allocate data. The data will not appear in a | |
279 | * crashdump if the kernel panics. This exists so that we will limit the amount | |
280 | * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount | |
281 | * of kernel heap dumped to disk when the kernel panics) | |
282 | */ | |
283 | void * | |
284 | zio_data_buf_alloc(size_t size) | |
285 | { | |
286 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
287 | ||
63e3a861 | 288 | VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); |
34dc7c2f | 289 | |
efcd79a8 | 290 | return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); |
34dc7c2f BB |
291 | } |
292 | ||
293 | void | |
294 | zio_buf_free(void *buf, size_t size) | |
295 | { | |
296 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
297 | ||
63e3a861 | 298 | VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); |
a6255b7f DQ |
299 | #if defined(ZFS_DEBUG) && !defined(_KERNEL) |
300 | atomic_add_64(&zio_buf_cache_frees[c], 1); | |
301 | #endif | |
34dc7c2f BB |
302 | |
303 | kmem_cache_free(zio_buf_cache[c], buf); | |
304 | } | |
305 | ||
306 | void | |
307 | zio_data_buf_free(void *buf, size_t size) | |
308 | { | |
309 | size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; | |
310 | ||
63e3a861 | 311 | VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); |
34dc7c2f BB |
312 | |
313 | kmem_cache_free(zio_data_buf_cache[c], buf); | |
314 | } | |
315 | ||
84c07ada GN |
316 | static void |
317 | zio_abd_free(void *abd, size_t size) | |
318 | { | |
319 | abd_free((abd_t *)abd); | |
320 | } | |
321 | ||
34dc7c2f BB |
322 | /* |
323 | * ========================================================================== | |
324 | * Push and pop I/O transform buffers | |
325 | * ========================================================================== | |
326 | */ | |
d3c2ae1c | 327 | void |
a6255b7f | 328 | zio_push_transform(zio_t *zio, abd_t *data, uint64_t size, uint64_t bufsize, |
e9aa730c | 329 | zio_transform_func_t *transform) |
34dc7c2f | 330 | { |
79c76d5b | 331 | zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); |
34dc7c2f | 332 | |
a6255b7f DQ |
333 | /* |
334 | * Ensure that anyone expecting this zio to contain a linear ABD isn't | |
335 | * going to get a nasty surprise when they try to access the data. | |
336 | */ | |
337 | IMPLY(abd_is_linear(zio->io_abd), abd_is_linear(data)); | |
338 | ||
339 | zt->zt_orig_abd = zio->io_abd; | |
b128c09f | 340 | zt->zt_orig_size = zio->io_size; |
34dc7c2f | 341 | zt->zt_bufsize = bufsize; |
b128c09f | 342 | zt->zt_transform = transform; |
34dc7c2f BB |
343 | |
344 | zt->zt_next = zio->io_transform_stack; | |
345 | zio->io_transform_stack = zt; | |
346 | ||
a6255b7f | 347 | zio->io_abd = data; |
34dc7c2f BB |
348 | zio->io_size = size; |
349 | } | |
350 | ||
d3c2ae1c | 351 | void |
b128c09f | 352 | zio_pop_transforms(zio_t *zio) |
34dc7c2f | 353 | { |
b128c09f BB |
354 | zio_transform_t *zt; |
355 | ||
356 | while ((zt = zio->io_transform_stack) != NULL) { | |
357 | if (zt->zt_transform != NULL) | |
358 | zt->zt_transform(zio, | |
a6255b7f | 359 | zt->zt_orig_abd, zt->zt_orig_size); |
34dc7c2f | 360 | |
428870ff | 361 | if (zt->zt_bufsize != 0) |
a6255b7f | 362 | abd_free(zio->io_abd); |
34dc7c2f | 363 | |
a6255b7f | 364 | zio->io_abd = zt->zt_orig_abd; |
b128c09f BB |
365 | zio->io_size = zt->zt_orig_size; |
366 | zio->io_transform_stack = zt->zt_next; | |
34dc7c2f | 367 | |
b128c09f | 368 | kmem_free(zt, sizeof (zio_transform_t)); |
34dc7c2f BB |
369 | } |
370 | } | |
371 | ||
b128c09f BB |
372 | /* |
373 | * ========================================================================== | |
b5256303 | 374 | * I/O transform callbacks for subblocks, decompression, and decryption |
b128c09f BB |
375 | * ========================================================================== |
376 | */ | |
377 | static void | |
a6255b7f | 378 | zio_subblock(zio_t *zio, abd_t *data, uint64_t size) |
b128c09f BB |
379 | { |
380 | ASSERT(zio->io_size > size); | |
381 | ||
382 | if (zio->io_type == ZIO_TYPE_READ) | |
a6255b7f | 383 | abd_copy(data, zio->io_abd, size); |
b128c09f BB |
384 | } |
385 | ||
386 | static void | |
a6255b7f | 387 | zio_decompress(zio_t *zio, abd_t *data, uint64_t size) |
b128c09f | 388 | { |
a6255b7f DQ |
389 | if (zio->io_error == 0) { |
390 | void *tmp = abd_borrow_buf(data, size); | |
391 | int ret = zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), | |
392 | zio->io_abd, tmp, zio->io_size, size); | |
393 | abd_return_buf_copy(data, tmp, size); | |
394 | ||
c3bd3fb4 TC |
395 | if (zio_injection_enabled && ret == 0) |
396 | ret = zio_handle_fault_injection(zio, EINVAL); | |
397 | ||
a6255b7f DQ |
398 | if (ret != 0) |
399 | zio->io_error = SET_ERROR(EIO); | |
400 | } | |
b128c09f BB |
401 | } |
402 | ||
b5256303 TC |
403 | static void |
404 | zio_decrypt(zio_t *zio, abd_t *data, uint64_t size) | |
405 | { | |
406 | int ret; | |
407 | void *tmp; | |
408 | blkptr_t *bp = zio->io_bp; | |
ae76f45c TC |
409 | spa_t *spa = zio->io_spa; |
410 | uint64_t dsobj = zio->io_bookmark.zb_objset; | |
b5256303 TC |
411 | uint64_t lsize = BP_GET_LSIZE(bp); |
412 | dmu_object_type_t ot = BP_GET_TYPE(bp); | |
413 | uint8_t salt[ZIO_DATA_SALT_LEN]; | |
414 | uint8_t iv[ZIO_DATA_IV_LEN]; | |
415 | uint8_t mac[ZIO_DATA_MAC_LEN]; | |
416 | boolean_t no_crypt = B_FALSE; | |
417 | ||
418 | ASSERT(BP_USES_CRYPT(bp)); | |
419 | ASSERT3U(size, !=, 0); | |
420 | ||
421 | if (zio->io_error != 0) | |
422 | return; | |
423 | ||
424 | /* | |
425 | * Verify the cksum of MACs stored in an indirect bp. It will always | |
426 | * be possible to verify this since it does not require an encryption | |
427 | * key. | |
428 | */ | |
429 | if (BP_HAS_INDIRECT_MAC_CKSUM(bp)) { | |
430 | zio_crypt_decode_mac_bp(bp, mac); | |
431 | ||
432 | if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF) { | |
433 | /* | |
434 | * We haven't decompressed the data yet, but | |
435 | * zio_crypt_do_indirect_mac_checksum() requires | |
436 | * decompressed data to be able to parse out the MACs | |
437 | * from the indirect block. We decompress it now and | |
438 | * throw away the result after we are finished. | |
439 | */ | |
440 | tmp = zio_buf_alloc(lsize); | |
441 | ret = zio_decompress_data(BP_GET_COMPRESS(bp), | |
442 | zio->io_abd, tmp, zio->io_size, lsize); | |
443 | if (ret != 0) { | |
444 | ret = SET_ERROR(EIO); | |
445 | goto error; | |
446 | } | |
447 | ret = zio_crypt_do_indirect_mac_checksum(B_FALSE, | |
448 | tmp, lsize, BP_SHOULD_BYTESWAP(bp), mac); | |
449 | zio_buf_free(tmp, lsize); | |
450 | } else { | |
451 | ret = zio_crypt_do_indirect_mac_checksum_abd(B_FALSE, | |
452 | zio->io_abd, size, BP_SHOULD_BYTESWAP(bp), mac); | |
453 | } | |
454 | abd_copy(data, zio->io_abd, size); | |
455 | ||
be9a5c35 TC |
456 | if (zio_injection_enabled && ot != DMU_OT_DNODE && ret == 0) { |
457 | ret = zio_handle_decrypt_injection(spa, | |
458 | &zio->io_bookmark, ot, ECKSUM); | |
459 | } | |
b5256303 TC |
460 | if (ret != 0) |
461 | goto error; | |
462 | ||
463 | return; | |
464 | } | |
465 | ||
466 | /* | |
467 | * If this is an authenticated block, just check the MAC. It would be | |
468 | * nice to separate this out into its own flag, but for the moment | |
469 | * enum zio_flag is out of bits. | |
470 | */ | |
471 | if (BP_IS_AUTHENTICATED(bp)) { | |
472 | if (ot == DMU_OT_OBJSET) { | |
ae76f45c TC |
473 | ret = spa_do_crypt_objset_mac_abd(B_FALSE, spa, |
474 | dsobj, zio->io_abd, size, BP_SHOULD_BYTESWAP(bp)); | |
b5256303 TC |
475 | } else { |
476 | zio_crypt_decode_mac_bp(bp, mac); | |
ae76f45c TC |
477 | ret = spa_do_crypt_mac_abd(B_FALSE, spa, dsobj, |
478 | zio->io_abd, size, mac); | |
be9a5c35 TC |
479 | if (zio_injection_enabled && ret == 0) { |
480 | ret = zio_handle_decrypt_injection(spa, | |
481 | &zio->io_bookmark, ot, ECKSUM); | |
482 | } | |
b5256303 TC |
483 | } |
484 | abd_copy(data, zio->io_abd, size); | |
485 | ||
486 | if (ret != 0) | |
487 | goto error; | |
488 | ||
489 | return; | |
490 | } | |
491 | ||
492 | zio_crypt_decode_params_bp(bp, salt, iv); | |
493 | ||
494 | if (ot == DMU_OT_INTENT_LOG) { | |
495 | tmp = abd_borrow_buf_copy(zio->io_abd, sizeof (zil_chain_t)); | |
496 | zio_crypt_decode_mac_zil(tmp, mac); | |
497 | abd_return_buf(zio->io_abd, tmp, sizeof (zil_chain_t)); | |
498 | } else { | |
499 | zio_crypt_decode_mac_bp(bp, mac); | |
500 | } | |
501 | ||
be9a5c35 TC |
502 | ret = spa_do_crypt_abd(B_FALSE, spa, &zio->io_bookmark, BP_GET_TYPE(bp), |
503 | BP_GET_DEDUP(bp), BP_SHOULD_BYTESWAP(bp), salt, iv, mac, size, data, | |
504 | zio->io_abd, &no_crypt); | |
b5256303 TC |
505 | if (no_crypt) |
506 | abd_copy(data, zio->io_abd, size); | |
507 | ||
508 | if (ret != 0) | |
509 | goto error; | |
510 | ||
511 | return; | |
512 | ||
513 | error: | |
514 | /* assert that the key was found unless this was speculative */ | |
be9a5c35 | 515 | ASSERT(ret != EACCES || (zio->io_flags & ZIO_FLAG_SPECULATIVE)); |
b5256303 TC |
516 | |
517 | /* | |
518 | * If there was a decryption / authentication error return EIO as | |
519 | * the io_error. If this was not a speculative zio, create an ereport. | |
520 | */ | |
521 | if (ret == ECKSUM) { | |
a2c2ed1b | 522 | zio->io_error = SET_ERROR(EIO); |
b5256303 | 523 | if ((zio->io_flags & ZIO_FLAG_SPECULATIVE) == 0) { |
be9a5c35 | 524 | spa_log_error(spa, &zio->io_bookmark); |
b5256303 | 525 | zfs_ereport_post(FM_EREPORT_ZFS_AUTHENTICATION, |
ae76f45c | 526 | spa, NULL, &zio->io_bookmark, zio, 0, 0); |
b5256303 TC |
527 | } |
528 | } else { | |
529 | zio->io_error = ret; | |
530 | } | |
531 | } | |
532 | ||
b128c09f BB |
533 | /* |
534 | * ========================================================================== | |
535 | * I/O parent/child relationships and pipeline interlocks | |
536 | * ========================================================================== | |
537 | */ | |
d164b209 | 538 | zio_t * |
3dfb57a3 | 539 | zio_walk_parents(zio_t *cio, zio_link_t **zl) |
d164b209 | 540 | { |
d164b209 | 541 | list_t *pl = &cio->io_parent_list; |
b128c09f | 542 | |
3dfb57a3 DB |
543 | *zl = (*zl == NULL) ? list_head(pl) : list_next(pl, *zl); |
544 | if (*zl == NULL) | |
d164b209 BB |
545 | return (NULL); |
546 | ||
3dfb57a3 DB |
547 | ASSERT((*zl)->zl_child == cio); |
548 | return ((*zl)->zl_parent); | |
d164b209 BB |
549 | } |
550 | ||
551 | zio_t * | |
3dfb57a3 | 552 | zio_walk_children(zio_t *pio, zio_link_t **zl) |
d164b209 | 553 | { |
d164b209 BB |
554 | list_t *cl = &pio->io_child_list; |
555 | ||
a8b2e306 TC |
556 | ASSERT(MUTEX_HELD(&pio->io_lock)); |
557 | ||
3dfb57a3 DB |
558 | *zl = (*zl == NULL) ? list_head(cl) : list_next(cl, *zl); |
559 | if (*zl == NULL) | |
d164b209 BB |
560 | return (NULL); |
561 | ||
3dfb57a3 DB |
562 | ASSERT((*zl)->zl_parent == pio); |
563 | return ((*zl)->zl_child); | |
d164b209 BB |
564 | } |
565 | ||
566 | zio_t * | |
567 | zio_unique_parent(zio_t *cio) | |
568 | { | |
3dfb57a3 DB |
569 | zio_link_t *zl = NULL; |
570 | zio_t *pio = zio_walk_parents(cio, &zl); | |
d164b209 | 571 | |
3dfb57a3 | 572 | VERIFY3P(zio_walk_parents(cio, &zl), ==, NULL); |
d164b209 BB |
573 | return (pio); |
574 | } | |
575 | ||
576 | void | |
577 | zio_add_child(zio_t *pio, zio_t *cio) | |
b128c09f | 578 | { |
79c76d5b | 579 | zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); |
d164b209 BB |
580 | |
581 | /* | |
582 | * Logical I/Os can have logical, gang, or vdev children. | |
583 | * Gang I/Os can have gang or vdev children. | |
584 | * Vdev I/Os can only have vdev children. | |
585 | * The following ASSERT captures all of these constraints. | |
586 | */ | |
1ce23dca | 587 | ASSERT3S(cio->io_child_type, <=, pio->io_child_type); |
d164b209 BB |
588 | |
589 | zl->zl_parent = pio; | |
590 | zl->zl_child = cio; | |
591 | ||
b128c09f | 592 | mutex_enter(&pio->io_lock); |
a8b2e306 | 593 | mutex_enter(&cio->io_lock); |
d164b209 BB |
594 | |
595 | ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); | |
596 | ||
1c27024e | 597 | for (int w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 BB |
598 | pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; |
599 | ||
600 | list_insert_head(&pio->io_child_list, zl); | |
601 | list_insert_head(&cio->io_parent_list, zl); | |
602 | ||
428870ff BB |
603 | pio->io_child_count++; |
604 | cio->io_parent_count++; | |
605 | ||
d164b209 | 606 | mutex_exit(&cio->io_lock); |
a8b2e306 | 607 | mutex_exit(&pio->io_lock); |
b128c09f BB |
608 | } |
609 | ||
34dc7c2f | 610 | static void |
d164b209 | 611 | zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) |
b128c09f | 612 | { |
d164b209 BB |
613 | ASSERT(zl->zl_parent == pio); |
614 | ASSERT(zl->zl_child == cio); | |
b128c09f BB |
615 | |
616 | mutex_enter(&pio->io_lock); | |
a8b2e306 | 617 | mutex_enter(&cio->io_lock); |
d164b209 BB |
618 | |
619 | list_remove(&pio->io_child_list, zl); | |
620 | list_remove(&cio->io_parent_list, zl); | |
621 | ||
428870ff BB |
622 | pio->io_child_count--; |
623 | cio->io_parent_count--; | |
624 | ||
d164b209 | 625 | mutex_exit(&cio->io_lock); |
a8b2e306 | 626 | mutex_exit(&pio->io_lock); |
d164b209 | 627 | kmem_cache_free(zio_link_cache, zl); |
b128c09f BB |
628 | } |
629 | ||
630 | static boolean_t | |
ddc751d5 | 631 | zio_wait_for_children(zio_t *zio, uint8_t childbits, enum zio_wait_type wait) |
34dc7c2f | 632 | { |
b128c09f BB |
633 | boolean_t waiting = B_FALSE; |
634 | ||
635 | mutex_enter(&zio->io_lock); | |
636 | ASSERT(zio->io_stall == NULL); | |
ddc751d5 GW |
637 | for (int c = 0; c < ZIO_CHILD_TYPES; c++) { |
638 | if (!(ZIO_CHILD_BIT_IS_SET(childbits, c))) | |
639 | continue; | |
640 | ||
641 | uint64_t *countp = &zio->io_children[c][wait]; | |
642 | if (*countp != 0) { | |
643 | zio->io_stage >>= 1; | |
644 | ASSERT3U(zio->io_stage, !=, ZIO_STAGE_OPEN); | |
645 | zio->io_stall = countp; | |
646 | waiting = B_TRUE; | |
647 | break; | |
648 | } | |
b128c09f BB |
649 | } |
650 | mutex_exit(&zio->io_lock); | |
b128c09f BB |
651 | return (waiting); |
652 | } | |
34dc7c2f | 653 | |
bf701a83 BB |
654 | __attribute__((always_inline)) |
655 | static inline void | |
62840030 MA |
656 | zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait, |
657 | zio_t **next_to_executep) | |
b128c09f BB |
658 | { |
659 | uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; | |
660 | int *errorp = &pio->io_child_error[zio->io_child_type]; | |
34dc7c2f | 661 | |
b128c09f BB |
662 | mutex_enter(&pio->io_lock); |
663 | if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) | |
664 | *errorp = zio_worst_error(*errorp, zio->io_error); | |
665 | pio->io_reexecute |= zio->io_reexecute; | |
666 | ASSERT3U(*countp, >, 0); | |
e8b96c60 MA |
667 | |
668 | (*countp)--; | |
669 | ||
670 | if (*countp == 0 && pio->io_stall == countp) { | |
3dfb57a3 DB |
671 | zio_taskq_type_t type = |
672 | pio->io_stage < ZIO_STAGE_VDEV_IO_START ? ZIO_TASKQ_ISSUE : | |
673 | ZIO_TASKQ_INTERRUPT; | |
b128c09f BB |
674 | pio->io_stall = NULL; |
675 | mutex_exit(&pio->io_lock); | |
62840030 | 676 | |
3dfb57a3 | 677 | /* |
62840030 MA |
678 | * If we can tell the caller to execute this parent next, do |
679 | * so. Otherwise dispatch the parent zio as its own task. | |
680 | * | |
681 | * Having the caller execute the parent when possible reduces | |
682 | * locking on the zio taskq's, reduces context switch | |
683 | * overhead, and has no recursion penalty. Note that one | |
684 | * read from disk typically causes at least 3 zio's: a | |
685 | * zio_null(), the logical zio_read(), and then a physical | |
686 | * zio. When the physical ZIO completes, we are able to call | |
687 | * zio_done() on all 3 of these zio's from one invocation of | |
688 | * zio_execute() by returning the parent back to | |
689 | * zio_execute(). Since the parent isn't executed until this | |
690 | * thread returns back to zio_execute(), the caller should do | |
691 | * so promptly. | |
692 | * | |
693 | * In other cases, dispatching the parent prevents | |
694 | * overflowing the stack when we have deeply nested | |
695 | * parent-child relationships, as we do with the "mega zio" | |
696 | * of writes for spa_sync(), and the chain of ZIL blocks. | |
3dfb57a3 | 697 | */ |
62840030 MA |
698 | if (next_to_executep != NULL && *next_to_executep == NULL) { |
699 | *next_to_executep = pio; | |
700 | } else { | |
701 | zio_taskq_dispatch(pio, type, B_FALSE); | |
702 | } | |
b128c09f BB |
703 | } else { |
704 | mutex_exit(&pio->io_lock); | |
34dc7c2f BB |
705 | } |
706 | } | |
707 | ||
b128c09f BB |
708 | static void |
709 | zio_inherit_child_errors(zio_t *zio, enum zio_child c) | |
710 | { | |
711 | if (zio->io_child_error[c] != 0 && zio->io_error == 0) | |
712 | zio->io_error = zio->io_child_error[c]; | |
713 | } | |
714 | ||
3dfb57a3 | 715 | int |
64fc7762 | 716 | zio_bookmark_compare(const void *x1, const void *x2) |
3dfb57a3 DB |
717 | { |
718 | const zio_t *z1 = x1; | |
719 | const zio_t *z2 = x2; | |
3dfb57a3 | 720 | |
64fc7762 MA |
721 | if (z1->io_bookmark.zb_objset < z2->io_bookmark.zb_objset) |
722 | return (-1); | |
723 | if (z1->io_bookmark.zb_objset > z2->io_bookmark.zb_objset) | |
724 | return (1); | |
3dfb57a3 | 725 | |
64fc7762 MA |
726 | if (z1->io_bookmark.zb_object < z2->io_bookmark.zb_object) |
727 | return (-1); | |
728 | if (z1->io_bookmark.zb_object > z2->io_bookmark.zb_object) | |
729 | return (1); | |
3dfb57a3 | 730 | |
64fc7762 MA |
731 | if (z1->io_bookmark.zb_level < z2->io_bookmark.zb_level) |
732 | return (-1); | |
733 | if (z1->io_bookmark.zb_level > z2->io_bookmark.zb_level) | |
734 | return (1); | |
735 | ||
736 | if (z1->io_bookmark.zb_blkid < z2->io_bookmark.zb_blkid) | |
737 | return (-1); | |
738 | if (z1->io_bookmark.zb_blkid > z2->io_bookmark.zb_blkid) | |
739 | return (1); | |
740 | ||
741 | if (z1 < z2) | |
742 | return (-1); | |
743 | if (z1 > z2) | |
744 | return (1); | |
745 | ||
746 | return (0); | |
3dfb57a3 DB |
747 | } |
748 | ||
34dc7c2f BB |
749 | /* |
750 | * ========================================================================== | |
b128c09f | 751 | * Create the various types of I/O (read, write, free, etc) |
34dc7c2f BB |
752 | * ========================================================================== |
753 | */ | |
754 | static zio_t * | |
428870ff | 755 | zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
a6255b7f | 756 | abd_t *data, uint64_t lsize, uint64_t psize, zio_done_func_t *done, |
2aa34383 DK |
757 | void *private, zio_type_t type, zio_priority_t priority, |
758 | enum zio_flag flags, vdev_t *vd, uint64_t offset, | |
759 | const zbookmark_phys_t *zb, enum zio_stage stage, | |
760 | enum zio_stage pipeline) | |
34dc7c2f BB |
761 | { |
762 | zio_t *zio; | |
763 | ||
2aa34383 DK |
764 | ASSERT3U(psize, <=, SPA_MAXBLOCKSIZE); |
765 | ASSERT(P2PHASE(psize, SPA_MINBLOCKSIZE) == 0); | |
b128c09f BB |
766 | ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); |
767 | ||
768 | ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); | |
769 | ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); | |
770 | ASSERT(vd || stage == ZIO_STAGE_OPEN); | |
34dc7c2f | 771 | |
b5256303 | 772 | IMPLY(lsize != psize, (flags & ZIO_FLAG_RAW_COMPRESS) != 0); |
2aa34383 | 773 | |
79c76d5b | 774 | zio = kmem_cache_alloc(zio_cache, KM_SLEEP); |
3941503c BB |
775 | bzero(zio, sizeof (zio_t)); |
776 | ||
448d7aaa | 777 | mutex_init(&zio->io_lock, NULL, MUTEX_NOLOCKDEP, NULL); |
3941503c BB |
778 | cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); |
779 | ||
780 | list_create(&zio->io_parent_list, sizeof (zio_link_t), | |
781 | offsetof(zio_link_t, zl_parent_node)); | |
782 | list_create(&zio->io_child_list, sizeof (zio_link_t), | |
783 | offsetof(zio_link_t, zl_child_node)); | |
4e21fd06 | 784 | metaslab_trace_init(&zio->io_alloc_list); |
d164b209 | 785 | |
b128c09f BB |
786 | if (vd != NULL) |
787 | zio->io_child_type = ZIO_CHILD_VDEV; | |
788 | else if (flags & ZIO_FLAG_GANG_CHILD) | |
789 | zio->io_child_type = ZIO_CHILD_GANG; | |
428870ff BB |
790 | else if (flags & ZIO_FLAG_DDT_CHILD) |
791 | zio->io_child_type = ZIO_CHILD_DDT; | |
b128c09f BB |
792 | else |
793 | zio->io_child_type = ZIO_CHILD_LOGICAL; | |
794 | ||
34dc7c2f | 795 | if (bp != NULL) { |
428870ff | 796 | zio->io_bp = (blkptr_t *)bp; |
34dc7c2f BB |
797 | zio->io_bp_copy = *bp; |
798 | zio->io_bp_orig = *bp; | |
428870ff BB |
799 | if (type != ZIO_TYPE_WRITE || |
800 | zio->io_child_type == ZIO_CHILD_DDT) | |
b128c09f | 801 | zio->io_bp = &zio->io_bp_copy; /* so caller can free */ |
9babb374 | 802 | if (zio->io_child_type == ZIO_CHILD_LOGICAL) |
b128c09f | 803 | zio->io_logical = zio; |
9babb374 BB |
804 | if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) |
805 | pipeline |= ZIO_GANG_STAGES; | |
34dc7c2f | 806 | } |
b128c09f BB |
807 | |
808 | zio->io_spa = spa; | |
809 | zio->io_txg = txg; | |
34dc7c2f BB |
810 | zio->io_done = done; |
811 | zio->io_private = private; | |
812 | zio->io_type = type; | |
813 | zio->io_priority = priority; | |
b128c09f BB |
814 | zio->io_vd = vd; |
815 | zio->io_offset = offset; | |
a6255b7f | 816 | zio->io_orig_abd = zio->io_abd = data; |
2aa34383 DK |
817 | zio->io_orig_size = zio->io_size = psize; |
818 | zio->io_lsize = lsize; | |
b128c09f BB |
819 | zio->io_orig_flags = zio->io_flags = flags; |
820 | zio->io_orig_stage = zio->io_stage = stage; | |
821 | zio->io_orig_pipeline = zio->io_pipeline = pipeline; | |
3dfb57a3 | 822 | zio->io_pipeline_trace = ZIO_STAGE_OPEN; |
34dc7c2f | 823 | |
d164b209 BB |
824 | zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); |
825 | zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); | |
826 | ||
b128c09f BB |
827 | if (zb != NULL) |
828 | zio->io_bookmark = *zb; | |
829 | ||
830 | if (pio != NULL) { | |
cc99f275 DB |
831 | if (zio->io_metaslab_class == NULL) |
832 | zio->io_metaslab_class = pio->io_metaslab_class; | |
b128c09f | 833 | if (zio->io_logical == NULL) |
34dc7c2f | 834 | zio->io_logical = pio->io_logical; |
9babb374 BB |
835 | if (zio->io_child_type == ZIO_CHILD_GANG) |
836 | zio->io_gang_leader = pio->io_gang_leader; | |
b128c09f | 837 | zio_add_child(pio, zio); |
34dc7c2f BB |
838 | } |
839 | ||
a38718a6 GA |
840 | taskq_init_ent(&zio->io_tqent); |
841 | ||
34dc7c2f BB |
842 | return (zio); |
843 | } | |
844 | ||
845 | static void | |
b128c09f | 846 | zio_destroy(zio_t *zio) |
34dc7c2f | 847 | { |
4e21fd06 | 848 | metaslab_trace_fini(&zio->io_alloc_list); |
3941503c BB |
849 | list_destroy(&zio->io_parent_list); |
850 | list_destroy(&zio->io_child_list); | |
851 | mutex_destroy(&zio->io_lock); | |
852 | cv_destroy(&zio->io_cv); | |
b128c09f | 853 | kmem_cache_free(zio_cache, zio); |
34dc7c2f BB |
854 | } |
855 | ||
856 | zio_t * | |
d164b209 | 857 | zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, |
428870ff | 858 | void *private, enum zio_flag flags) |
34dc7c2f BB |
859 | { |
860 | zio_t *zio; | |
861 | ||
2aa34383 | 862 | zio = zio_create(pio, spa, 0, NULL, NULL, 0, 0, done, private, |
d164b209 | 863 | ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, |
b128c09f | 864 | ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); |
34dc7c2f BB |
865 | |
866 | return (zio); | |
867 | } | |
868 | ||
869 | zio_t * | |
428870ff | 870 | zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) |
34dc7c2f | 871 | { |
d164b209 | 872 | return (zio_null(NULL, spa, NULL, done, private, flags)); |
34dc7c2f BB |
873 | } |
874 | ||
63e3a861 MA |
875 | void |
876 | zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp) | |
877 | { | |
63e3a861 MA |
878 | if (!DMU_OT_IS_VALID(BP_GET_TYPE(bp))) { |
879 | zfs_panic_recover("blkptr at %p has invalid TYPE %llu", | |
880 | bp, (longlong_t)BP_GET_TYPE(bp)); | |
881 | } | |
882 | if (BP_GET_CHECKSUM(bp) >= ZIO_CHECKSUM_FUNCTIONS || | |
883 | BP_GET_CHECKSUM(bp) <= ZIO_CHECKSUM_ON) { | |
884 | zfs_panic_recover("blkptr at %p has invalid CHECKSUM %llu", | |
885 | bp, (longlong_t)BP_GET_CHECKSUM(bp)); | |
886 | } | |
887 | if (BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_FUNCTIONS || | |
888 | BP_GET_COMPRESS(bp) <= ZIO_COMPRESS_ON) { | |
889 | zfs_panic_recover("blkptr at %p has invalid COMPRESS %llu", | |
890 | bp, (longlong_t)BP_GET_COMPRESS(bp)); | |
891 | } | |
892 | if (BP_GET_LSIZE(bp) > SPA_MAXBLOCKSIZE) { | |
893 | zfs_panic_recover("blkptr at %p has invalid LSIZE %llu", | |
894 | bp, (longlong_t)BP_GET_LSIZE(bp)); | |
895 | } | |
896 | if (BP_GET_PSIZE(bp) > SPA_MAXBLOCKSIZE) { | |
897 | zfs_panic_recover("blkptr at %p has invalid PSIZE %llu", | |
898 | bp, (longlong_t)BP_GET_PSIZE(bp)); | |
899 | } | |
900 | ||
901 | if (BP_IS_EMBEDDED(bp)) { | |
902 | if (BPE_GET_ETYPE(bp) > NUM_BP_EMBEDDED_TYPES) { | |
903 | zfs_panic_recover("blkptr at %p has invalid ETYPE %llu", | |
904 | bp, (longlong_t)BPE_GET_ETYPE(bp)); | |
905 | } | |
906 | } | |
907 | ||
6cb8e530 PZ |
908 | /* |
909 | * Do not verify individual DVAs if the config is not trusted. This | |
910 | * will be done once the zio is executed in vdev_mirror_map_alloc. | |
911 | */ | |
912 | if (!spa->spa_trust_config) | |
913 | return; | |
914 | ||
63e3a861 MA |
915 | /* |
916 | * Pool-specific checks. | |
917 | * | |
918 | * Note: it would be nice to verify that the blk_birth and | |
919 | * BP_PHYSICAL_BIRTH() are not too large. However, spa_freeze() | |
920 | * allows the birth time of log blocks (and dmu_sync()-ed blocks | |
921 | * that are in the log) to be arbitrarily large. | |
922 | */ | |
1c27024e | 923 | for (int i = 0; i < BP_GET_NDVAS(bp); i++) { |
63e3a861 | 924 | uint64_t vdevid = DVA_GET_VDEV(&bp->blk_dva[i]); |
1c27024e | 925 | |
63e3a861 MA |
926 | if (vdevid >= spa->spa_root_vdev->vdev_children) { |
927 | zfs_panic_recover("blkptr at %p DVA %u has invalid " | |
928 | "VDEV %llu", | |
929 | bp, i, (longlong_t)vdevid); | |
ee3a23b8 | 930 | continue; |
63e3a861 | 931 | } |
1c27024e | 932 | vdev_t *vd = spa->spa_root_vdev->vdev_child[vdevid]; |
63e3a861 MA |
933 | if (vd == NULL) { |
934 | zfs_panic_recover("blkptr at %p DVA %u has invalid " | |
935 | "VDEV %llu", | |
936 | bp, i, (longlong_t)vdevid); | |
ee3a23b8 | 937 | continue; |
63e3a861 MA |
938 | } |
939 | if (vd->vdev_ops == &vdev_hole_ops) { | |
940 | zfs_panic_recover("blkptr at %p DVA %u has hole " | |
941 | "VDEV %llu", | |
942 | bp, i, (longlong_t)vdevid); | |
ee3a23b8 | 943 | continue; |
63e3a861 MA |
944 | } |
945 | if (vd->vdev_ops == &vdev_missing_ops) { | |
946 | /* | |
947 | * "missing" vdevs are valid during import, but we | |
948 | * don't have their detailed info (e.g. asize), so | |
949 | * we can't perform any more checks on them. | |
950 | */ | |
951 | continue; | |
952 | } | |
1c27024e DB |
953 | uint64_t offset = DVA_GET_OFFSET(&bp->blk_dva[i]); |
954 | uint64_t asize = DVA_GET_ASIZE(&bp->blk_dva[i]); | |
63e3a861 MA |
955 | if (BP_IS_GANG(bp)) |
956 | asize = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE); | |
957 | if (offset + asize > vd->vdev_asize) { | |
958 | zfs_panic_recover("blkptr at %p DVA %u has invalid " | |
959 | "OFFSET %llu", | |
960 | bp, i, (longlong_t)offset); | |
961 | } | |
962 | } | |
963 | } | |
964 | ||
6cb8e530 PZ |
965 | boolean_t |
966 | zfs_dva_valid(spa_t *spa, const dva_t *dva, const blkptr_t *bp) | |
967 | { | |
968 | uint64_t vdevid = DVA_GET_VDEV(dva); | |
969 | ||
970 | if (vdevid >= spa->spa_root_vdev->vdev_children) | |
971 | return (B_FALSE); | |
972 | ||
973 | vdev_t *vd = spa->spa_root_vdev->vdev_child[vdevid]; | |
974 | if (vd == NULL) | |
975 | return (B_FALSE); | |
976 | ||
977 | if (vd->vdev_ops == &vdev_hole_ops) | |
978 | return (B_FALSE); | |
979 | ||
980 | if (vd->vdev_ops == &vdev_missing_ops) { | |
981 | return (B_FALSE); | |
982 | } | |
983 | ||
984 | uint64_t offset = DVA_GET_OFFSET(dva); | |
985 | uint64_t asize = DVA_GET_ASIZE(dva); | |
986 | ||
987 | if (BP_IS_GANG(bp)) | |
988 | asize = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE); | |
989 | if (offset + asize > vd->vdev_asize) | |
990 | return (B_FALSE); | |
991 | ||
992 | return (B_TRUE); | |
993 | } | |
994 | ||
34dc7c2f | 995 | zio_t * |
b128c09f | 996 | zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, |
a6255b7f | 997 | abd_t *data, uint64_t size, zio_done_func_t *done, void *private, |
5dbd68a3 | 998 | zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb) |
34dc7c2f BB |
999 | { |
1000 | zio_t *zio; | |
1001 | ||
63e3a861 MA |
1002 | zfs_blkptr_verify(spa, bp); |
1003 | ||
428870ff | 1004 | zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, |
2aa34383 | 1005 | data, size, size, done, private, |
b128c09f | 1006 | ZIO_TYPE_READ, priority, flags, NULL, 0, zb, |
428870ff BB |
1007 | ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? |
1008 | ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); | |
34dc7c2f | 1009 | |
b128c09f BB |
1010 | return (zio); |
1011 | } | |
34dc7c2f | 1012 | |
34dc7c2f | 1013 | zio_t * |
b128c09f | 1014 | zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, |
a6255b7f | 1015 | abd_t *data, uint64_t lsize, uint64_t psize, const zio_prop_t *zp, |
bc77ba73 PD |
1016 | zio_done_func_t *ready, zio_done_func_t *children_ready, |
1017 | zio_done_func_t *physdone, zio_done_func_t *done, | |
1018 | void *private, zio_priority_t priority, enum zio_flag flags, | |
1019 | const zbookmark_phys_t *zb) | |
34dc7c2f BB |
1020 | { |
1021 | zio_t *zio; | |
1022 | ||
b128c09f BB |
1023 | ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && |
1024 | zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && | |
1025 | zp->zp_compress >= ZIO_COMPRESS_OFF && | |
1026 | zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && | |
9ae529ec | 1027 | DMU_OT_IS_VALID(zp->zp_type) && |
b128c09f | 1028 | zp->zp_level < 32 && |
428870ff | 1029 | zp->zp_copies > 0 && |
03c6040b | 1030 | zp->zp_copies <= spa_max_replication(spa)); |
34dc7c2f | 1031 | |
2aa34383 | 1032 | zio = zio_create(pio, spa, txg, bp, data, lsize, psize, done, private, |
b128c09f | 1033 | ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, |
428870ff BB |
1034 | ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? |
1035 | ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); | |
34dc7c2f BB |
1036 | |
1037 | zio->io_ready = ready; | |
bc77ba73 | 1038 | zio->io_children_ready = children_ready; |
e8b96c60 | 1039 | zio->io_physdone = physdone; |
b128c09f | 1040 | zio->io_prop = *zp; |
34dc7c2f | 1041 | |
9b67f605 MA |
1042 | /* |
1043 | * Data can be NULL if we are going to call zio_write_override() to | |
1044 | * provide the already-allocated BP. But we may need the data to | |
1045 | * verify a dedup hit (if requested). In this case, don't try to | |
b5256303 TC |
1046 | * dedup (just take the already-allocated BP verbatim). Encrypted |
1047 | * dedup blocks need data as well so we also disable dedup in this | |
1048 | * case. | |
9b67f605 | 1049 | */ |
b5256303 TC |
1050 | if (data == NULL && |
1051 | (zio->io_prop.zp_dedup_verify || zio->io_prop.zp_encrypt)) { | |
9b67f605 MA |
1052 | zio->io_prop.zp_dedup = zio->io_prop.zp_dedup_verify = B_FALSE; |
1053 | } | |
1054 | ||
34dc7c2f BB |
1055 | return (zio); |
1056 | } | |
1057 | ||
1058 | zio_t * | |
a6255b7f | 1059 | zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, abd_t *data, |
e8b96c60 | 1060 | uint64_t size, zio_done_func_t *done, void *private, |
5dbd68a3 | 1061 | zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb) |
34dc7c2f BB |
1062 | { |
1063 | zio_t *zio; | |
1064 | ||
2aa34383 | 1065 | zio = zio_create(pio, spa, txg, bp, data, size, size, done, private, |
3dfb57a3 | 1066 | ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_IO_REWRITE, NULL, 0, zb, |
b128c09f | 1067 | ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); |
34dc7c2f BB |
1068 | |
1069 | return (zio); | |
1070 | } | |
1071 | ||
428870ff | 1072 | void |
03c6040b | 1073 | zio_write_override(zio_t *zio, blkptr_t *bp, int copies, boolean_t nopwrite) |
428870ff BB |
1074 | { |
1075 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); | |
1076 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1077 | ASSERT(zio->io_stage == ZIO_STAGE_OPEN); | |
1078 | ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); | |
1079 | ||
03c6040b GW |
1080 | /* |
1081 | * We must reset the io_prop to match the values that existed | |
1082 | * when the bp was first written by dmu_sync() keeping in mind | |
1083 | * that nopwrite and dedup are mutually exclusive. | |
1084 | */ | |
1085 | zio->io_prop.zp_dedup = nopwrite ? B_FALSE : zio->io_prop.zp_dedup; | |
1086 | zio->io_prop.zp_nopwrite = nopwrite; | |
428870ff BB |
1087 | zio->io_prop.zp_copies = copies; |
1088 | zio->io_bp_override = bp; | |
1089 | } | |
1090 | ||
1091 | void | |
1092 | zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) | |
1093 | { | |
9b67f605 | 1094 | |
a1d477c2 MA |
1095 | zfs_blkptr_verify(spa, bp); |
1096 | ||
9b67f605 MA |
1097 | /* |
1098 | * The check for EMBEDDED is a performance optimization. We | |
1099 | * process the free here (by ignoring it) rather than | |
1100 | * putting it on the list and then processing it in zio_free_sync(). | |
1101 | */ | |
1102 | if (BP_IS_EMBEDDED(bp)) | |
1103 | return; | |
13fe0198 | 1104 | metaslab_check_free(spa, bp); |
2883cad5 MA |
1105 | |
1106 | /* | |
1107 | * Frees that are for the currently-syncing txg, are not going to be | |
1108 | * deferred, and which will not need to do a read (i.e. not GANG or | |
1109 | * DEDUP), can be processed immediately. Otherwise, put them on the | |
1110 | * in-memory list for later processing. | |
1111 | */ | |
1112 | if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp) || | |
1113 | txg != spa->spa_syncing_txg || | |
1114 | spa_sync_pass(spa) >= zfs_sync_pass_deferred_free) { | |
1115 | bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp); | |
1116 | } else { | |
1117 | VERIFY0(zio_wait(zio_free_sync(NULL, spa, txg, bp, 0))); | |
1118 | } | |
428870ff BB |
1119 | } |
1120 | ||
34dc7c2f | 1121 | zio_t * |
428870ff BB |
1122 | zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
1123 | enum zio_flag flags) | |
34dc7c2f BB |
1124 | { |
1125 | zio_t *zio; | |
2883cad5 | 1126 | enum zio_stage stage = ZIO_FREE_PIPELINE; |
34dc7c2f | 1127 | |
428870ff BB |
1128 | ASSERT(!BP_IS_HOLE(bp)); |
1129 | ASSERT(spa_syncing_txg(spa) == txg); | |
55d85d5a | 1130 | ASSERT(spa_sync_pass(spa) < zfs_sync_pass_deferred_free); |
34dc7c2f | 1131 | |
9b67f605 MA |
1132 | if (BP_IS_EMBEDDED(bp)) |
1133 | return (zio_null(pio, spa, NULL, NULL, NULL, 0)); | |
1134 | ||
13fe0198 | 1135 | metaslab_check_free(spa, bp); |
8c841793 | 1136 | arc_freed(spa, bp); |
d4a72f23 | 1137 | dsl_scan_freed(spa, bp); |
13fe0198 | 1138 | |
2883cad5 MA |
1139 | /* |
1140 | * GANG and DEDUP blocks can induce a read (for the gang block header, | |
1141 | * or the DDT), so issue them asynchronously so that this thread is | |
1142 | * not tied up. | |
1143 | */ | |
1144 | if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp)) | |
1145 | stage |= ZIO_STAGE_ISSUE_ASYNC; | |
1146 | ||
b128c09f | 1147 | zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), |
2aa34383 DK |
1148 | BP_GET_PSIZE(bp), NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_NOW, |
1149 | flags, NULL, 0, NULL, ZIO_STAGE_OPEN, stage); | |
2883cad5 | 1150 | |
34dc7c2f BB |
1151 | return (zio); |
1152 | } | |
1153 | ||
1154 | zio_t * | |
428870ff BB |
1155 | zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, |
1156 | zio_done_func_t *done, void *private, enum zio_flag flags) | |
34dc7c2f BB |
1157 | { |
1158 | zio_t *zio; | |
1159 | ||
a1d477c2 | 1160 | zfs_blkptr_verify(spa, bp); |
9b67f605 MA |
1161 | |
1162 | if (BP_IS_EMBEDDED(bp)) | |
1163 | return (zio_null(pio, spa, NULL, NULL, NULL, 0)); | |
1164 | ||
34dc7c2f BB |
1165 | /* |
1166 | * A claim is an allocation of a specific block. Claims are needed | |
1167 | * to support immediate writes in the intent log. The issue is that | |
1168 | * immediate writes contain committed data, but in a txg that was | |
1169 | * *not* committed. Upon opening the pool after an unclean shutdown, | |
1170 | * the intent log claims all blocks that contain immediate write data | |
1171 | * so that the SPA knows they're in use. | |
1172 | * | |
1173 | * All claims *must* be resolved in the first txg -- before the SPA | |
1174 | * starts allocating blocks -- so that nothing is allocated twice. | |
428870ff | 1175 | * If txg == 0 we just verify that the block is claimable. |
34dc7c2f | 1176 | */ |
d2734cce SD |
1177 | ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, |
1178 | spa_min_claim_txg(spa)); | |
1179 | ASSERT(txg == spa_min_claim_txg(spa) || txg == 0); | |
428870ff | 1180 | ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ |
34dc7c2f | 1181 | |
b128c09f | 1182 | zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), |
2aa34383 DK |
1183 | BP_GET_PSIZE(bp), done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, |
1184 | flags, NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); | |
3dfb57a3 | 1185 | ASSERT0(zio->io_queued_timestamp); |
34dc7c2f BB |
1186 | |
1187 | return (zio); | |
1188 | } | |
1189 | ||
1190 | zio_t * | |
1191 | zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, | |
e8b96c60 | 1192 | zio_done_func_t *done, void *private, enum zio_flag flags) |
34dc7c2f BB |
1193 | { |
1194 | zio_t *zio; | |
1195 | int c; | |
1196 | ||
1197 | if (vd->vdev_children == 0) { | |
2aa34383 | 1198 | zio = zio_create(pio, spa, 0, NULL, NULL, 0, 0, done, private, |
e8b96c60 | 1199 | ZIO_TYPE_IOCTL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, |
34dc7c2f BB |
1200 | ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); |
1201 | ||
34dc7c2f BB |
1202 | zio->io_cmd = cmd; |
1203 | } else { | |
d164b209 | 1204 | zio = zio_null(pio, spa, NULL, NULL, NULL, flags); |
34dc7c2f BB |
1205 | |
1206 | for (c = 0; c < vd->vdev_children; c++) | |
1207 | zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, | |
e8b96c60 | 1208 | done, private, flags)); |
34dc7c2f BB |
1209 | } |
1210 | ||
1211 | return (zio); | |
1212 | } | |
1213 | ||
34dc7c2f BB |
1214 | zio_t * |
1215 | zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, | |
a6255b7f | 1216 | abd_t *data, int checksum, zio_done_func_t *done, void *private, |
e8b96c60 | 1217 | zio_priority_t priority, enum zio_flag flags, boolean_t labels) |
34dc7c2f BB |
1218 | { |
1219 | zio_t *zio; | |
34dc7c2f | 1220 | |
b128c09f BB |
1221 | ASSERT(vd->vdev_children == 0); |
1222 | ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || | |
1223 | offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); | |
1224 | ASSERT3U(offset + size, <=, vd->vdev_psize); | |
34dc7c2f | 1225 | |
2aa34383 DK |
1226 | zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, size, done, |
1227 | private, ZIO_TYPE_READ, priority, flags | ZIO_FLAG_PHYSICAL, vd, | |
1228 | offset, NULL, ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); | |
34dc7c2f | 1229 | |
b128c09f | 1230 | zio->io_prop.zp_checksum = checksum; |
34dc7c2f BB |
1231 | |
1232 | return (zio); | |
1233 | } | |
1234 | ||
1235 | zio_t * | |
1236 | zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, | |
a6255b7f | 1237 | abd_t *data, int checksum, zio_done_func_t *done, void *private, |
e8b96c60 | 1238 | zio_priority_t priority, enum zio_flag flags, boolean_t labels) |
34dc7c2f | 1239 | { |
34dc7c2f | 1240 | zio_t *zio; |
34dc7c2f | 1241 | |
b128c09f BB |
1242 | ASSERT(vd->vdev_children == 0); |
1243 | ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || | |
1244 | offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); | |
1245 | ASSERT3U(offset + size, <=, vd->vdev_psize); | |
34dc7c2f | 1246 | |
2aa34383 DK |
1247 | zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, size, done, |
1248 | private, ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_PHYSICAL, vd, | |
1249 | offset, NULL, ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); | |
34dc7c2f | 1250 | |
b128c09f | 1251 | zio->io_prop.zp_checksum = checksum; |
34dc7c2f | 1252 | |
3c67d83a | 1253 | if (zio_checksum_table[checksum].ci_flags & ZCHECKSUM_FLAG_EMBEDDED) { |
34dc7c2f | 1254 | /* |
428870ff | 1255 | * zec checksums are necessarily destructive -- they modify |
b128c09f | 1256 | * the end of the write buffer to hold the verifier/checksum. |
34dc7c2f | 1257 | * Therefore, we must make a local copy in case the data is |
b128c09f | 1258 | * being written to multiple places in parallel. |
34dc7c2f | 1259 | */ |
a6255b7f DQ |
1260 | abd_t *wbuf = abd_alloc_sametype(data, size); |
1261 | abd_copy(wbuf, data, size); | |
1262 | ||
b128c09f | 1263 | zio_push_transform(zio, wbuf, size, size, NULL); |
34dc7c2f BB |
1264 | } |
1265 | ||
1266 | return (zio); | |
1267 | } | |
1268 | ||
1269 | /* | |
b128c09f | 1270 | * Create a child I/O to do some work for us. |
34dc7c2f BB |
1271 | */ |
1272 | zio_t * | |
b128c09f | 1273 | zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, |
4ea3f864 GM |
1274 | abd_t *data, uint64_t size, int type, zio_priority_t priority, |
1275 | enum zio_flag flags, zio_done_func_t *done, void *private) | |
34dc7c2f | 1276 | { |
428870ff | 1277 | enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; |
b128c09f BB |
1278 | zio_t *zio; |
1279 | ||
a1d477c2 MA |
1280 | /* |
1281 | * vdev child I/Os do not propagate their error to the parent. | |
1282 | * Therefore, for correct operation the caller *must* check for | |
1283 | * and handle the error in the child i/o's done callback. | |
1284 | * The only exceptions are i/os that we don't care about | |
1285 | * (OPTIONAL or REPAIR). | |
1286 | */ | |
1287 | ASSERT((flags & ZIO_FLAG_OPTIONAL) || (flags & ZIO_FLAG_IO_REPAIR) || | |
1288 | done != NULL); | |
1289 | ||
34dc7c2f BB |
1290 | if (type == ZIO_TYPE_READ && bp != NULL) { |
1291 | /* | |
1292 | * If we have the bp, then the child should perform the | |
1293 | * checksum and the parent need not. This pushes error | |
1294 | * detection as close to the leaves as possible and | |
1295 | * eliminates redundant checksums in the interior nodes. | |
1296 | */ | |
428870ff BB |
1297 | pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; |
1298 | pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; | |
34dc7c2f BB |
1299 | } |
1300 | ||
a1d477c2 MA |
1301 | if (vd->vdev_ops->vdev_op_leaf) { |
1302 | ASSERT0(vd->vdev_children); | |
b128c09f | 1303 | offset += VDEV_LABEL_START_SIZE; |
a1d477c2 | 1304 | } |
b128c09f | 1305 | |
a1d477c2 | 1306 | flags |= ZIO_VDEV_CHILD_FLAGS(pio); |
428870ff BB |
1307 | |
1308 | /* | |
1309 | * If we've decided to do a repair, the write is not speculative -- | |
1310 | * even if the original read was. | |
1311 | */ | |
1312 | if (flags & ZIO_FLAG_IO_REPAIR) | |
1313 | flags &= ~ZIO_FLAG_SPECULATIVE; | |
1314 | ||
3dfb57a3 DB |
1315 | /* |
1316 | * If we're creating a child I/O that is not associated with a | |
1317 | * top-level vdev, then the child zio is not an allocating I/O. | |
1318 | * If this is a retried I/O then we ignore it since we will | |
1319 | * have already processed the original allocating I/O. | |
1320 | */ | |
1321 | if (flags & ZIO_FLAG_IO_ALLOCATING && | |
1322 | (vd != vd->vdev_top || (flags & ZIO_FLAG_IO_RETRY))) { | |
cc99f275 DB |
1323 | ASSERT(pio->io_metaslab_class != NULL); |
1324 | ASSERT(pio->io_metaslab_class->mc_alloc_throttle_enabled); | |
3dfb57a3 DB |
1325 | ASSERT(type == ZIO_TYPE_WRITE); |
1326 | ASSERT(priority == ZIO_PRIORITY_ASYNC_WRITE); | |
1327 | ASSERT(!(flags & ZIO_FLAG_IO_REPAIR)); | |
1328 | ASSERT(!(pio->io_flags & ZIO_FLAG_IO_REWRITE) || | |
1329 | pio->io_child_type == ZIO_CHILD_GANG); | |
1330 | ||
1331 | flags &= ~ZIO_FLAG_IO_ALLOCATING; | |
1332 | } | |
1333 | ||
1334 | ||
2aa34383 | 1335 | zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, size, |
428870ff BB |
1336 | done, private, type, priority, flags, vd, offset, &pio->io_bookmark, |
1337 | ZIO_STAGE_VDEV_IO_START >> 1, pipeline); | |
3dfb57a3 | 1338 | ASSERT3U(zio->io_child_type, ==, ZIO_CHILD_VDEV); |
34dc7c2f | 1339 | |
e8b96c60 MA |
1340 | zio->io_physdone = pio->io_physdone; |
1341 | if (vd->vdev_ops->vdev_op_leaf && zio->io_logical != NULL) | |
1342 | zio->io_logical->io_phys_children++; | |
1343 | ||
b128c09f | 1344 | return (zio); |
34dc7c2f BB |
1345 | } |
1346 | ||
b128c09f | 1347 | zio_t * |
a6255b7f | 1348 | zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, abd_t *data, uint64_t size, |
9e052db4 | 1349 | zio_type_t type, zio_priority_t priority, enum zio_flag flags, |
e9aa730c | 1350 | zio_done_func_t *done, void *private) |
34dc7c2f | 1351 | { |
b128c09f | 1352 | zio_t *zio; |
34dc7c2f | 1353 | |
b128c09f | 1354 | ASSERT(vd->vdev_ops->vdev_op_leaf); |
34dc7c2f | 1355 | |
b128c09f | 1356 | zio = zio_create(NULL, vd->vdev_spa, 0, NULL, |
2aa34383 | 1357 | data, size, size, done, private, type, priority, |
e8b96c60 | 1358 | flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY | ZIO_FLAG_DELEGATED, |
b128c09f | 1359 | vd, offset, NULL, |
428870ff | 1360 | ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); |
34dc7c2f | 1361 | |
b128c09f | 1362 | return (zio); |
34dc7c2f BB |
1363 | } |
1364 | ||
1365 | void | |
b128c09f | 1366 | zio_flush(zio_t *zio, vdev_t *vd) |
34dc7c2f | 1367 | { |
b128c09f | 1368 | zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, |
e8b96c60 | 1369 | NULL, NULL, |
b128c09f | 1370 | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); |
34dc7c2f BB |
1371 | } |
1372 | ||
428870ff BB |
1373 | void |
1374 | zio_shrink(zio_t *zio, uint64_t size) | |
1375 | { | |
1ce23dca PS |
1376 | ASSERT3P(zio->io_executor, ==, NULL); |
1377 | ASSERT3U(zio->io_orig_size, ==, zio->io_size); | |
1378 | ASSERT3U(size, <=, zio->io_size); | |
428870ff BB |
1379 | |
1380 | /* | |
1381 | * We don't shrink for raidz because of problems with the | |
1382 | * reconstruction when reading back less than the block size. | |
1383 | * Note, BP_IS_RAIDZ() assumes no compression. | |
1384 | */ | |
1385 | ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); | |
2aa34383 DK |
1386 | if (!BP_IS_RAIDZ(zio->io_bp)) { |
1387 | /* we are not doing a raw write */ | |
1388 | ASSERT3U(zio->io_size, ==, zio->io_lsize); | |
1389 | zio->io_orig_size = zio->io_size = zio->io_lsize = size; | |
1390 | } | |
428870ff BB |
1391 | } |
1392 | ||
34dc7c2f BB |
1393 | /* |
1394 | * ========================================================================== | |
b128c09f | 1395 | * Prepare to read and write logical blocks |
34dc7c2f BB |
1396 | * ========================================================================== |
1397 | */ | |
b128c09f | 1398 | |
62840030 | 1399 | static zio_t * |
b128c09f | 1400 | zio_read_bp_init(zio_t *zio) |
34dc7c2f | 1401 | { |
b128c09f | 1402 | blkptr_t *bp = zio->io_bp; |
b5256303 TC |
1403 | uint64_t psize = |
1404 | BP_IS_EMBEDDED(bp) ? BPE_GET_PSIZE(bp) : BP_GET_PSIZE(bp); | |
34dc7c2f | 1405 | |
a1d477c2 MA |
1406 | ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy); |
1407 | ||
fb5f0bc8 | 1408 | if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && |
9babb374 | 1409 | zio->io_child_type == ZIO_CHILD_LOGICAL && |
b5256303 | 1410 | !(zio->io_flags & ZIO_FLAG_RAW_COMPRESS)) { |
a6255b7f DQ |
1411 | zio_push_transform(zio, abd_alloc_sametype(zio->io_abd, psize), |
1412 | psize, psize, zio_decompress); | |
34dc7c2f | 1413 | } |
34dc7c2f | 1414 | |
b5256303 TC |
1415 | if (((BP_IS_PROTECTED(bp) && !(zio->io_flags & ZIO_FLAG_RAW_ENCRYPT)) || |
1416 | BP_HAS_INDIRECT_MAC_CKSUM(bp)) && | |
1417 | zio->io_child_type == ZIO_CHILD_LOGICAL) { | |
1418 | zio_push_transform(zio, abd_alloc_sametype(zio->io_abd, psize), | |
1419 | psize, psize, zio_decrypt); | |
1420 | } | |
1421 | ||
9b67f605 | 1422 | if (BP_IS_EMBEDDED(bp) && BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA) { |
a6255b7f DQ |
1423 | int psize = BPE_GET_PSIZE(bp); |
1424 | void *data = abd_borrow_buf(zio->io_abd, psize); | |
1425 | ||
9b67f605 | 1426 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
a6255b7f DQ |
1427 | decode_embedded_bp_compressed(bp, data); |
1428 | abd_return_buf_copy(zio->io_abd, data, psize); | |
9b67f605 MA |
1429 | } else { |
1430 | ASSERT(!BP_IS_EMBEDDED(bp)); | |
a1d477c2 | 1431 | ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy); |
9b67f605 MA |
1432 | } |
1433 | ||
9ae529ec | 1434 | if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) && BP_GET_LEVEL(bp) == 0) |
b128c09f BB |
1435 | zio->io_flags |= ZIO_FLAG_DONT_CACHE; |
1436 | ||
428870ff BB |
1437 | if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) |
1438 | zio->io_flags |= ZIO_FLAG_DONT_CACHE; | |
1439 | ||
1440 | if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) | |
1441 | zio->io_pipeline = ZIO_DDT_READ_PIPELINE; | |
1442 | ||
62840030 | 1443 | return (zio); |
34dc7c2f BB |
1444 | } |
1445 | ||
62840030 | 1446 | static zio_t * |
b128c09f | 1447 | zio_write_bp_init(zio_t *zio) |
34dc7c2f | 1448 | { |
b128c09f | 1449 | if (!IO_IS_ALLOCATING(zio)) |
62840030 | 1450 | return (zio); |
34dc7c2f | 1451 | |
428870ff BB |
1452 | ASSERT(zio->io_child_type != ZIO_CHILD_DDT); |
1453 | ||
1454 | if (zio->io_bp_override) { | |
3dfb57a3 DB |
1455 | blkptr_t *bp = zio->io_bp; |
1456 | zio_prop_t *zp = &zio->io_prop; | |
1457 | ||
428870ff BB |
1458 | ASSERT(bp->blk_birth != zio->io_txg); |
1459 | ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); | |
1460 | ||
1461 | *bp = *zio->io_bp_override; | |
1462 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
1463 | ||
9b67f605 | 1464 | if (BP_IS_EMBEDDED(bp)) |
62840030 | 1465 | return (zio); |
9b67f605 | 1466 | |
03c6040b GW |
1467 | /* |
1468 | * If we've been overridden and nopwrite is set then | |
1469 | * set the flag accordingly to indicate that a nopwrite | |
1470 | * has already occurred. | |
1471 | */ | |
1472 | if (!BP_IS_HOLE(bp) && zp->zp_nopwrite) { | |
1473 | ASSERT(!zp->zp_dedup); | |
3dfb57a3 | 1474 | ASSERT3U(BP_GET_CHECKSUM(bp), ==, zp->zp_checksum); |
03c6040b | 1475 | zio->io_flags |= ZIO_FLAG_NOPWRITE; |
62840030 | 1476 | return (zio); |
03c6040b GW |
1477 | } |
1478 | ||
1479 | ASSERT(!zp->zp_nopwrite); | |
1480 | ||
428870ff | 1481 | if (BP_IS_HOLE(bp) || !zp->zp_dedup) |
62840030 | 1482 | return (zio); |
428870ff | 1483 | |
3c67d83a TH |
1484 | ASSERT((zio_checksum_table[zp->zp_checksum].ci_flags & |
1485 | ZCHECKSUM_FLAG_DEDUP) || zp->zp_dedup_verify); | |
428870ff | 1486 | |
b5256303 TC |
1487 | if (BP_GET_CHECKSUM(bp) == zp->zp_checksum && |
1488 | !zp->zp_encrypt) { | |
428870ff BB |
1489 | BP_SET_DEDUP(bp, 1); |
1490 | zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; | |
62840030 | 1491 | return (zio); |
428870ff | 1492 | } |
3dfb57a3 DB |
1493 | |
1494 | /* | |
1495 | * We were unable to handle this as an override bp, treat | |
1496 | * it as a regular write I/O. | |
1497 | */ | |
5511754b | 1498 | zio->io_bp_override = NULL; |
3dfb57a3 DB |
1499 | *bp = zio->io_bp_orig; |
1500 | zio->io_pipeline = zio->io_orig_pipeline; | |
1501 | } | |
1502 | ||
62840030 | 1503 | return (zio); |
3dfb57a3 DB |
1504 | } |
1505 | ||
62840030 | 1506 | static zio_t * |
3dfb57a3 DB |
1507 | zio_write_compress(zio_t *zio) |
1508 | { | |
1509 | spa_t *spa = zio->io_spa; | |
1510 | zio_prop_t *zp = &zio->io_prop; | |
1511 | enum zio_compress compress = zp->zp_compress; | |
1512 | blkptr_t *bp = zio->io_bp; | |
1513 | uint64_t lsize = zio->io_lsize; | |
1514 | uint64_t psize = zio->io_size; | |
1515 | int pass = 1; | |
1516 | ||
3dfb57a3 DB |
1517 | /* |
1518 | * If our children haven't all reached the ready stage, | |
1519 | * wait for them and then repeat this pipeline stage. | |
1520 | */ | |
ddc751d5 GW |
1521 | if (zio_wait_for_children(zio, ZIO_CHILD_LOGICAL_BIT | |
1522 | ZIO_CHILD_GANG_BIT, ZIO_WAIT_READY)) { | |
62840030 | 1523 | return (NULL); |
ddc751d5 | 1524 | } |
3dfb57a3 DB |
1525 | |
1526 | if (!IO_IS_ALLOCATING(zio)) | |
62840030 | 1527 | return (zio); |
3dfb57a3 DB |
1528 | |
1529 | if (zio->io_children_ready != NULL) { | |
1530 | /* | |
1531 | * Now that all our children are ready, run the callback | |
1532 | * associated with this zio in case it wants to modify the | |
1533 | * data to be written. | |
1534 | */ | |
1535 | ASSERT3U(zp->zp_level, >, 0); | |
1536 | zio->io_children_ready(zio); | |
428870ff | 1537 | } |
34dc7c2f | 1538 | |
3dfb57a3 DB |
1539 | ASSERT(zio->io_child_type != ZIO_CHILD_DDT); |
1540 | ASSERT(zio->io_bp_override == NULL); | |
1541 | ||
b0bc7a84 | 1542 | if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg) { |
b128c09f BB |
1543 | /* |
1544 | * We're rewriting an existing block, which means we're | |
1545 | * working on behalf of spa_sync(). For spa_sync() to | |
1546 | * converge, it must eventually be the case that we don't | |
1547 | * have to allocate new blocks. But compression changes | |
1548 | * the blocksize, which forces a reallocate, and makes | |
1549 | * convergence take longer. Therefore, after the first | |
1550 | * few passes, stop compressing to ensure convergence. | |
1551 | */ | |
428870ff BB |
1552 | pass = spa_sync_pass(spa); |
1553 | ||
1554 | ASSERT(zio->io_txg == spa_syncing_txg(spa)); | |
1555 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1556 | ASSERT(!BP_GET_DEDUP(bp)); | |
34dc7c2f | 1557 | |
55d85d5a | 1558 | if (pass >= zfs_sync_pass_dont_compress) |
b128c09f | 1559 | compress = ZIO_COMPRESS_OFF; |
34dc7c2f | 1560 | |
b128c09f | 1561 | /* Make sure someone doesn't change their mind on overwrites */ |
9b67f605 | 1562 | ASSERT(BP_IS_EMBEDDED(bp) || MIN(zp->zp_copies + BP_IS_GANG(bp), |
428870ff | 1563 | spa_max_replication(spa)) == BP_GET_NDVAS(bp)); |
b128c09f | 1564 | } |
34dc7c2f | 1565 | |
2aa34383 | 1566 | /* If it's a compressed write that is not raw, compress the buffer. */ |
b5256303 TC |
1567 | if (compress != ZIO_COMPRESS_OFF && |
1568 | !(zio->io_flags & ZIO_FLAG_RAW_COMPRESS)) { | |
428870ff | 1569 | void *cbuf = zio_buf_alloc(lsize); |
a6255b7f | 1570 | psize = zio_compress_data(compress, zio->io_abd, cbuf, lsize); |
428870ff | 1571 | if (psize == 0 || psize == lsize) { |
b128c09f | 1572 | compress = ZIO_COMPRESS_OFF; |
428870ff | 1573 | zio_buf_free(cbuf, lsize); |
b5256303 TC |
1574 | } else if (!zp->zp_dedup && !zp->zp_encrypt && |
1575 | psize <= BPE_PAYLOAD_SIZE && | |
9b67f605 MA |
1576 | zp->zp_level == 0 && !DMU_OT_HAS_FILL(zp->zp_type) && |
1577 | spa_feature_is_enabled(spa, SPA_FEATURE_EMBEDDED_DATA)) { | |
1578 | encode_embedded_bp_compressed(bp, | |
1579 | cbuf, compress, lsize, psize); | |
1580 | BPE_SET_ETYPE(bp, BP_EMBEDDED_TYPE_DATA); | |
1581 | BP_SET_TYPE(bp, zio->io_prop.zp_type); | |
1582 | BP_SET_LEVEL(bp, zio->io_prop.zp_level); | |
1583 | zio_buf_free(cbuf, lsize); | |
1584 | bp->blk_birth = zio->io_txg; | |
1585 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
1586 | ASSERT(spa_feature_is_active(spa, | |
1587 | SPA_FEATURE_EMBEDDED_DATA)); | |
62840030 | 1588 | return (zio); |
428870ff | 1589 | } else { |
9b67f605 | 1590 | /* |
c3520e7f MA |
1591 | * Round up compressed size up to the ashift |
1592 | * of the smallest-ashift device, and zero the tail. | |
1593 | * This ensures that the compressed size of the BP | |
1594 | * (and thus compressratio property) are correct, | |
1595 | * in that we charge for the padding used to fill out | |
1596 | * the last sector. | |
9b67f605 | 1597 | */ |
c3520e7f | 1598 | ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT); |
1c27024e | 1599 | size_t rounded = (size_t)P2ROUNDUP(psize, |
c3520e7f MA |
1600 | 1ULL << spa->spa_min_ashift); |
1601 | if (rounded >= lsize) { | |
9b67f605 MA |
1602 | compress = ZIO_COMPRESS_OFF; |
1603 | zio_buf_free(cbuf, lsize); | |
c3520e7f | 1604 | psize = lsize; |
9b67f605 | 1605 | } else { |
a6255b7f DQ |
1606 | abd_t *cdata = abd_get_from_buf(cbuf, lsize); |
1607 | abd_take_ownership_of_buf(cdata, B_TRUE); | |
1608 | abd_zero_off(cdata, psize, rounded - psize); | |
c3520e7f | 1609 | psize = rounded; |
a6255b7f | 1610 | zio_push_transform(zio, cdata, |
9b67f605 MA |
1611 | psize, lsize, NULL); |
1612 | } | |
b128c09f | 1613 | } |
3dfb57a3 DB |
1614 | |
1615 | /* | |
1616 | * We were unable to handle this as an override bp, treat | |
1617 | * it as a regular write I/O. | |
1618 | */ | |
1619 | zio->io_bp_override = NULL; | |
1620 | *bp = zio->io_bp_orig; | |
1621 | zio->io_pipeline = zio->io_orig_pipeline; | |
1622 | ||
b1d21733 TC |
1623 | } else if ((zio->io_flags & ZIO_FLAG_RAW_ENCRYPT) != 0 && |
1624 | zp->zp_type == DMU_OT_DNODE) { | |
1625 | /* | |
1626 | * The DMU actually relies on the zio layer's compression | |
1627 | * to free metadnode blocks that have had all contained | |
1628 | * dnodes freed. As a result, even when doing a raw | |
1629 | * receive, we must check whether the block can be compressed | |
1630 | * to a hole. | |
1631 | */ | |
1632 | psize = zio_compress_data(ZIO_COMPRESS_EMPTY, | |
1633 | zio->io_abd, NULL, lsize); | |
1634 | if (psize == 0) | |
1635 | compress = ZIO_COMPRESS_OFF; | |
2aa34383 DK |
1636 | } else { |
1637 | ASSERT3U(psize, !=, 0); | |
b128c09f | 1638 | } |
34dc7c2f | 1639 | |
b128c09f BB |
1640 | /* |
1641 | * The final pass of spa_sync() must be all rewrites, but the first | |
1642 | * few passes offer a trade-off: allocating blocks defers convergence, | |
1643 | * but newly allocated blocks are sequential, so they can be written | |
1644 | * to disk faster. Therefore, we allow the first few passes of | |
1645 | * spa_sync() to allocate new blocks, but force rewrites after that. | |
1646 | * There should only be a handful of blocks after pass 1 in any case. | |
1647 | */ | |
b0bc7a84 MG |
1648 | if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg && |
1649 | BP_GET_PSIZE(bp) == psize && | |
55d85d5a | 1650 | pass >= zfs_sync_pass_rewrite) { |
cc99f275 | 1651 | VERIFY3U(psize, !=, 0); |
1c27024e | 1652 | enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; |
cc99f275 | 1653 | |
b128c09f BB |
1654 | zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; |
1655 | zio->io_flags |= ZIO_FLAG_IO_REWRITE; | |
1656 | } else { | |
1657 | BP_ZERO(bp); | |
1658 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
1659 | } | |
34dc7c2f | 1660 | |
428870ff | 1661 | if (psize == 0) { |
b0bc7a84 MG |
1662 | if (zio->io_bp_orig.blk_birth != 0 && |
1663 | spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { | |
1664 | BP_SET_LSIZE(bp, lsize); | |
1665 | BP_SET_TYPE(bp, zp->zp_type); | |
1666 | BP_SET_LEVEL(bp, zp->zp_level); | |
1667 | BP_SET_BIRTH(bp, zio->io_txg, 0); | |
1668 | } | |
b128c09f BB |
1669 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
1670 | } else { | |
1671 | ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); | |
1672 | BP_SET_LSIZE(bp, lsize); | |
b0bc7a84 MG |
1673 | BP_SET_TYPE(bp, zp->zp_type); |
1674 | BP_SET_LEVEL(bp, zp->zp_level); | |
428870ff | 1675 | BP_SET_PSIZE(bp, psize); |
b128c09f BB |
1676 | BP_SET_COMPRESS(bp, compress); |
1677 | BP_SET_CHECKSUM(bp, zp->zp_checksum); | |
428870ff | 1678 | BP_SET_DEDUP(bp, zp->zp_dedup); |
b128c09f | 1679 | BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); |
428870ff BB |
1680 | if (zp->zp_dedup) { |
1681 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1682 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); | |
b5256303 TC |
1683 | ASSERT(!zp->zp_encrypt || |
1684 | DMU_OT_IS_ENCRYPTED(zp->zp_type)); | |
428870ff BB |
1685 | zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; |
1686 | } | |
03c6040b GW |
1687 | if (zp->zp_nopwrite) { |
1688 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
1689 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); | |
1690 | zio->io_pipeline |= ZIO_STAGE_NOP_WRITE; | |
1691 | } | |
428870ff | 1692 | } |
62840030 | 1693 | return (zio); |
428870ff BB |
1694 | } |
1695 | ||
62840030 | 1696 | static zio_t * |
428870ff BB |
1697 | zio_free_bp_init(zio_t *zio) |
1698 | { | |
1699 | blkptr_t *bp = zio->io_bp; | |
1700 | ||
1701 | if (zio->io_child_type == ZIO_CHILD_LOGICAL) { | |
1702 | if (BP_GET_DEDUP(bp)) | |
1703 | zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; | |
b128c09f | 1704 | } |
34dc7c2f | 1705 | |
a1d477c2 MA |
1706 | ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy); |
1707 | ||
62840030 | 1708 | return (zio); |
34dc7c2f BB |
1709 | } |
1710 | ||
b128c09f BB |
1711 | /* |
1712 | * ========================================================================== | |
1713 | * Execute the I/O pipeline | |
1714 | * ========================================================================== | |
1715 | */ | |
1716 | ||
1717 | static void | |
7ef5e54e | 1718 | zio_taskq_dispatch(zio_t *zio, zio_taskq_type_t q, boolean_t cutinline) |
34dc7c2f | 1719 | { |
428870ff | 1720 | spa_t *spa = zio->io_spa; |
b128c09f | 1721 | zio_type_t t = zio->io_type; |
a38718a6 | 1722 | int flags = (cutinline ? TQ_FRONT : 0); |
34dc7c2f BB |
1723 | |
1724 | /* | |
9babb374 BB |
1725 | * If we're a config writer or a probe, the normal issue and |
1726 | * interrupt threads may all be blocked waiting for the config lock. | |
1727 | * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. | |
34dc7c2f | 1728 | */ |
9babb374 | 1729 | if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) |
b128c09f | 1730 | t = ZIO_TYPE_NULL; |
34dc7c2f BB |
1731 | |
1732 | /* | |
b128c09f | 1733 | * A similar issue exists for the L2ARC write thread until L2ARC 2.0. |
34dc7c2f | 1734 | */ |
b128c09f BB |
1735 | if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) |
1736 | t = ZIO_TYPE_NULL; | |
34dc7c2f | 1737 | |
428870ff | 1738 | /* |
7ef5e54e AL |
1739 | * If this is a high priority I/O, then use the high priority taskq if |
1740 | * available. | |
428870ff | 1741 | */ |
18b14b17 GW |
1742 | if ((zio->io_priority == ZIO_PRIORITY_NOW || |
1743 | zio->io_priority == ZIO_PRIORITY_SYNC_WRITE) && | |
7ef5e54e | 1744 | spa->spa_zio_taskq[t][q + 1].stqs_count != 0) |
428870ff BB |
1745 | q++; |
1746 | ||
1747 | ASSERT3U(q, <, ZIO_TASKQ_TYPES); | |
5cc556b4 | 1748 | |
a38718a6 GA |
1749 | /* |
1750 | * NB: We are assuming that the zio can only be dispatched | |
1751 | * to a single taskq at a time. It would be a grievous error | |
1752 | * to dispatch the zio to another taskq at the same time. | |
1753 | */ | |
1754 | ASSERT(taskq_empty_ent(&zio->io_tqent)); | |
7ef5e54e AL |
1755 | spa_taskq_dispatch_ent(spa, t, q, (task_func_t *)zio_execute, zio, |
1756 | flags, &zio->io_tqent); | |
b128c09f | 1757 | } |
34dc7c2f | 1758 | |
b128c09f | 1759 | static boolean_t |
7ef5e54e | 1760 | zio_taskq_member(zio_t *zio, zio_taskq_type_t q) |
b128c09f BB |
1761 | { |
1762 | kthread_t *executor = zio->io_executor; | |
1763 | spa_t *spa = zio->io_spa; | |
34dc7c2f | 1764 | |
1c27024e | 1765 | for (zio_type_t t = 0; t < ZIO_TYPES; t++) { |
7ef5e54e AL |
1766 | spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; |
1767 | uint_t i; | |
1768 | for (i = 0; i < tqs->stqs_count; i++) { | |
1769 | if (taskq_member(tqs->stqs_taskq[i], executor)) | |
1770 | return (B_TRUE); | |
1771 | } | |
1772 | } | |
34dc7c2f | 1773 | |
b128c09f BB |
1774 | return (B_FALSE); |
1775 | } | |
34dc7c2f | 1776 | |
62840030 | 1777 | static zio_t * |
b128c09f BB |
1778 | zio_issue_async(zio_t *zio) |
1779 | { | |
428870ff | 1780 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); |
b128c09f | 1781 | |
62840030 | 1782 | return (NULL); |
34dc7c2f BB |
1783 | } |
1784 | ||
b128c09f BB |
1785 | void |
1786 | zio_interrupt(zio_t *zio) | |
34dc7c2f | 1787 | { |
428870ff | 1788 | zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE); |
b128c09f | 1789 | } |
34dc7c2f | 1790 | |
26ef0cc7 TH |
1791 | void |
1792 | zio_delay_interrupt(zio_t *zio) | |
1793 | { | |
1794 | /* | |
1795 | * The timeout_generic() function isn't defined in userspace, so | |
1796 | * rather than trying to implement the function, the zio delay | |
1797 | * functionality has been disabled for userspace builds. | |
1798 | */ | |
1799 | ||
1800 | #ifdef _KERNEL | |
1801 | /* | |
1802 | * If io_target_timestamp is zero, then no delay has been registered | |
1803 | * for this IO, thus jump to the end of this function and "skip" the | |
1804 | * delay; issuing it directly to the zio layer. | |
1805 | */ | |
1806 | if (zio->io_target_timestamp != 0) { | |
1807 | hrtime_t now = gethrtime(); | |
1808 | ||
1809 | if (now >= zio->io_target_timestamp) { | |
1810 | /* | |
1811 | * This IO has already taken longer than the target | |
1812 | * delay to complete, so we don't want to delay it | |
1813 | * any longer; we "miss" the delay and issue it | |
1814 | * directly to the zio layer. This is likely due to | |
1815 | * the target latency being set to a value less than | |
1816 | * the underlying hardware can satisfy (e.g. delay | |
1817 | * set to 1ms, but the disks take 10ms to complete an | |
1818 | * IO request). | |
1819 | */ | |
1820 | ||
1821 | DTRACE_PROBE2(zio__delay__miss, zio_t *, zio, | |
1822 | hrtime_t, now); | |
1823 | ||
1824 | zio_interrupt(zio); | |
1825 | } else { | |
1826 | taskqid_t tid; | |
1827 | hrtime_t diff = zio->io_target_timestamp - now; | |
1828 | clock_t expire_at_tick = ddi_get_lbolt() + | |
1829 | NSEC_TO_TICK(diff); | |
1830 | ||
1831 | DTRACE_PROBE3(zio__delay__hit, zio_t *, zio, | |
1832 | hrtime_t, now, hrtime_t, diff); | |
1833 | ||
1834 | if (NSEC_TO_TICK(diff) == 0) { | |
1835 | /* Our delay is less than a jiffy - just spin */ | |
1836 | zfs_sleep_until(zio->io_target_timestamp); | |
f545b6ae | 1837 | zio_interrupt(zio); |
26ef0cc7 TH |
1838 | } else { |
1839 | /* | |
1840 | * Use taskq_dispatch_delay() in the place of | |
1841 | * OpenZFS's timeout_generic(). | |
1842 | */ | |
1843 | tid = taskq_dispatch_delay(system_taskq, | |
02730c33 | 1844 | (task_func_t *)zio_interrupt, |
26ef0cc7 | 1845 | zio, TQ_NOSLEEP, expire_at_tick); |
48d3eb40 | 1846 | if (tid == TASKQID_INVALID) { |
26ef0cc7 TH |
1847 | /* |
1848 | * Couldn't allocate a task. Just | |
1849 | * finish the zio without a delay. | |
1850 | */ | |
1851 | zio_interrupt(zio); | |
1852 | } | |
1853 | } | |
1854 | } | |
1855 | return; | |
1856 | } | |
1857 | #endif | |
1858 | DTRACE_PROBE1(zio__delay__skip, zio_t *, zio); | |
1859 | zio_interrupt(zio); | |
1860 | } | |
1861 | ||
8fb1ede1 | 1862 | static void |
638dd5f4 | 1863 | zio_deadman_impl(zio_t *pio, int ziodepth) |
8fb1ede1 BB |
1864 | { |
1865 | zio_t *cio, *cio_next; | |
1866 | zio_link_t *zl = NULL; | |
1867 | vdev_t *vd = pio->io_vd; | |
1868 | ||
638dd5f4 TC |
1869 | if (zio_deadman_log_all || (vd != NULL && vd->vdev_ops->vdev_op_leaf)) { |
1870 | vdev_queue_t *vq = vd ? &vd->vdev_queue : NULL; | |
8fb1ede1 BB |
1871 | zbookmark_phys_t *zb = &pio->io_bookmark; |
1872 | uint64_t delta = gethrtime() - pio->io_timestamp; | |
1873 | uint64_t failmode = spa_get_deadman_failmode(pio->io_spa); | |
1874 | ||
638dd5f4 | 1875 | zfs_dbgmsg("slow zio[%d]: zio=%p timestamp=%llu " |
8fb1ede1 BB |
1876 | "delta=%llu queued=%llu io=%llu " |
1877 | "path=%s last=%llu " | |
1878 | "type=%d priority=%d flags=0x%x " | |
1879 | "stage=0x%x pipeline=0x%x pipeline-trace=0x%x " | |
1880 | "objset=%llu object=%llu level=%llu blkid=%llu " | |
1881 | "offset=%llu size=%llu error=%d", | |
638dd5f4 | 1882 | ziodepth, pio, pio->io_timestamp, |
8fb1ede1 | 1883 | delta, pio->io_delta, pio->io_delay, |
638dd5f4 | 1884 | vd ? vd->vdev_path : "NULL", vq ? vq->vq_io_complete_ts : 0, |
8fb1ede1 | 1885 | pio->io_type, pio->io_priority, pio->io_flags, |
638dd5f4 | 1886 | pio->io_stage, pio->io_pipeline, pio->io_pipeline_trace, |
8fb1ede1 BB |
1887 | zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid, |
1888 | pio->io_offset, pio->io_size, pio->io_error); | |
1889 | zfs_ereport_post(FM_EREPORT_ZFS_DEADMAN, | |
1890 | pio->io_spa, vd, zb, pio, 0, 0); | |
1891 | ||
1892 | if (failmode == ZIO_FAILURE_MODE_CONTINUE && | |
1893 | taskq_empty_ent(&pio->io_tqent)) { | |
1894 | zio_interrupt(pio); | |
1895 | } | |
1896 | } | |
1897 | ||
1898 | mutex_enter(&pio->io_lock); | |
1899 | for (cio = zio_walk_children(pio, &zl); cio != NULL; cio = cio_next) { | |
1900 | cio_next = zio_walk_children(pio, &zl); | |
638dd5f4 | 1901 | zio_deadman_impl(cio, ziodepth + 1); |
8fb1ede1 BB |
1902 | } |
1903 | mutex_exit(&pio->io_lock); | |
1904 | } | |
1905 | ||
1906 | /* | |
1907 | * Log the critical information describing this zio and all of its children | |
1908 | * using the zfs_dbgmsg() interface then post deadman event for the ZED. | |
1909 | */ | |
1910 | void | |
1911 | zio_deadman(zio_t *pio, char *tag) | |
1912 | { | |
1913 | spa_t *spa = pio->io_spa; | |
1914 | char *name = spa_name(spa); | |
1915 | ||
1916 | if (!zfs_deadman_enabled || spa_suspended(spa)) | |
1917 | return; | |
1918 | ||
638dd5f4 | 1919 | zio_deadman_impl(pio, 0); |
8fb1ede1 BB |
1920 | |
1921 | switch (spa_get_deadman_failmode(spa)) { | |
1922 | case ZIO_FAILURE_MODE_WAIT: | |
1923 | zfs_dbgmsg("%s waiting for hung I/O to pool '%s'", tag, name); | |
1924 | break; | |
1925 | ||
1926 | case ZIO_FAILURE_MODE_CONTINUE: | |
1927 | zfs_dbgmsg("%s restarting hung I/O for pool '%s'", tag, name); | |
1928 | break; | |
1929 | ||
1930 | case ZIO_FAILURE_MODE_PANIC: | |
1931 | fm_panic("%s determined I/O to pool '%s' is hung.", tag, name); | |
1932 | break; | |
1933 | } | |
1934 | } | |
1935 | ||
b128c09f BB |
1936 | /* |
1937 | * Execute the I/O pipeline until one of the following occurs: | |
1938 | * (1) the I/O completes; (2) the pipeline stalls waiting for | |
1939 | * dependent child I/Os; (3) the I/O issues, so we're waiting | |
1940 | * for an I/O completion interrupt; (4) the I/O is delegated by | |
1941 | * vdev-level caching or aggregation; (5) the I/O is deferred | |
1942 | * due to vdev-level queueing; (6) the I/O is handed off to | |
1943 | * another thread. In all cases, the pipeline stops whenever | |
8e07b99b | 1944 | * there's no CPU work; it never burns a thread in cv_wait_io(). |
b128c09f BB |
1945 | * |
1946 | * There's no locking on io_stage because there's no legitimate way | |
1947 | * for multiple threads to be attempting to process the same I/O. | |
1948 | */ | |
428870ff | 1949 | static zio_pipe_stage_t *zio_pipeline[]; |
34dc7c2f | 1950 | |
da6b4005 NB |
1951 | /* |
1952 | * zio_execute() is a wrapper around the static function | |
1953 | * __zio_execute() so that we can force __zio_execute() to be | |
1954 | * inlined. This reduces stack overhead which is important | |
1955 | * because __zio_execute() is called recursively in several zio | |
1956 | * code paths. zio_execute() itself cannot be inlined because | |
1957 | * it is externally visible. | |
1958 | */ | |
b128c09f BB |
1959 | void |
1960 | zio_execute(zio_t *zio) | |
da6b4005 | 1961 | { |
92119cc2 BB |
1962 | fstrans_cookie_t cookie; |
1963 | ||
1964 | cookie = spl_fstrans_mark(); | |
da6b4005 | 1965 | __zio_execute(zio); |
92119cc2 | 1966 | spl_fstrans_unmark(cookie); |
da6b4005 NB |
1967 | } |
1968 | ||
b58986ee BB |
1969 | /* |
1970 | * Used to determine if in the current context the stack is sized large | |
1971 | * enough to allow zio_execute() to be called recursively. A minimum | |
1972 | * stack size of 16K is required to avoid needing to re-dispatch the zio. | |
1973 | */ | |
1974 | boolean_t | |
1975 | zio_execute_stack_check(zio_t *zio) | |
1976 | { | |
1977 | #if !defined(HAVE_LARGE_STACKS) | |
1978 | dsl_pool_t *dp = spa_get_dsl(zio->io_spa); | |
1979 | ||
1980 | /* Executing in txg_sync_thread() context. */ | |
1981 | if (dp && curthread == dp->dp_tx.tx_sync_thread) | |
1982 | return (B_TRUE); | |
1983 | ||
1984 | /* Pool initialization outside of zio_taskq context. */ | |
1985 | if (dp && spa_is_initializing(dp->dp_spa) && | |
1986 | !zio_taskq_member(zio, ZIO_TASKQ_ISSUE) && | |
1987 | !zio_taskq_member(zio, ZIO_TASKQ_ISSUE_HIGH)) | |
1988 | return (B_TRUE); | |
1989 | #endif /* HAVE_LARGE_STACKS */ | |
1990 | ||
1991 | return (B_FALSE); | |
1992 | } | |
1993 | ||
da6b4005 NB |
1994 | __attribute__((always_inline)) |
1995 | static inline void | |
1996 | __zio_execute(zio_t *zio) | |
b128c09f | 1997 | { |
3dfb57a3 DB |
1998 | ASSERT3U(zio->io_queued_timestamp, >, 0); |
1999 | ||
b128c09f | 2000 | while (zio->io_stage < ZIO_STAGE_DONE) { |
428870ff BB |
2001 | enum zio_stage pipeline = zio->io_pipeline; |
2002 | enum zio_stage stage = zio->io_stage; | |
62840030 MA |
2003 | |
2004 | zio->io_executor = curthread; | |
34dc7c2f | 2005 | |
b128c09f | 2006 | ASSERT(!MUTEX_HELD(&zio->io_lock)); |
428870ff BB |
2007 | ASSERT(ISP2(stage)); |
2008 | ASSERT(zio->io_stall == NULL); | |
34dc7c2f | 2009 | |
428870ff BB |
2010 | do { |
2011 | stage <<= 1; | |
2012 | } while ((stage & pipeline) == 0); | |
b128c09f BB |
2013 | |
2014 | ASSERT(stage <= ZIO_STAGE_DONE); | |
34dc7c2f BB |
2015 | |
2016 | /* | |
b128c09f BB |
2017 | * If we are in interrupt context and this pipeline stage |
2018 | * will grab a config lock that is held across I/O, | |
428870ff BB |
2019 | * or may wait for an I/O that needs an interrupt thread |
2020 | * to complete, issue async to avoid deadlock. | |
2021 | * | |
2022 | * For VDEV_IO_START, we cut in line so that the io will | |
2023 | * be sent to disk promptly. | |
34dc7c2f | 2024 | */ |
91579709 BB |
2025 | if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && |
2026 | zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { | |
b58986ee BB |
2027 | boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ? |
2028 | zio_requeue_io_start_cut_in_line : B_FALSE; | |
91579709 BB |
2029 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); |
2030 | return; | |
2031 | } | |
2032 | ||
2033 | /* | |
b58986ee BB |
2034 | * If the current context doesn't have large enough stacks |
2035 | * the zio must be issued asynchronously to prevent overflow. | |
91579709 | 2036 | */ |
b58986ee BB |
2037 | if (zio_execute_stack_check(zio)) { |
2038 | boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ? | |
2039 | zio_requeue_io_start_cut_in_line : B_FALSE; | |
428870ff | 2040 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); |
b128c09f | 2041 | return; |
34dc7c2f BB |
2042 | } |
2043 | ||
b128c09f | 2044 | zio->io_stage = stage; |
3dfb57a3 | 2045 | zio->io_pipeline_trace |= zio->io_stage; |
34dc7c2f | 2046 | |
62840030 MA |
2047 | /* |
2048 | * The zio pipeline stage returns the next zio to execute | |
2049 | * (typically the same as this one), or NULL if we should | |
2050 | * stop. | |
2051 | */ | |
2052 | zio = zio_pipeline[highbit64(stage) - 1](zio); | |
34dc7c2f | 2053 | |
62840030 MA |
2054 | if (zio == NULL) |
2055 | return; | |
b128c09f | 2056 | } |
34dc7c2f BB |
2057 | } |
2058 | ||
da6b4005 | 2059 | |
b128c09f BB |
2060 | /* |
2061 | * ========================================================================== | |
2062 | * Initiate I/O, either sync or async | |
2063 | * ========================================================================== | |
2064 | */ | |
2065 | int | |
2066 | zio_wait(zio_t *zio) | |
34dc7c2f | 2067 | { |
8fb1ede1 | 2068 | long timeout = MSEC_TO_TICK(zfs_deadman_ziotime_ms); |
b128c09f | 2069 | int error; |
34dc7c2f | 2070 | |
1ce23dca PS |
2071 | ASSERT3S(zio->io_stage, ==, ZIO_STAGE_OPEN); |
2072 | ASSERT3P(zio->io_executor, ==, NULL); | |
34dc7c2f | 2073 | |
b128c09f | 2074 | zio->io_waiter = curthread; |
3dfb57a3 DB |
2075 | ASSERT0(zio->io_queued_timestamp); |
2076 | zio->io_queued_timestamp = gethrtime(); | |
34dc7c2f | 2077 | |
da6b4005 | 2078 | __zio_execute(zio); |
34dc7c2f | 2079 | |
b128c09f | 2080 | mutex_enter(&zio->io_lock); |
8fb1ede1 BB |
2081 | while (zio->io_executor != NULL) { |
2082 | error = cv_timedwait_io(&zio->io_cv, &zio->io_lock, | |
2083 | ddi_get_lbolt() + timeout); | |
2084 | ||
2085 | if (zfs_deadman_enabled && error == -1 && | |
2086 | gethrtime() - zio->io_queued_timestamp > | |
2087 | spa_deadman_ziotime(zio->io_spa)) { | |
2088 | mutex_exit(&zio->io_lock); | |
2089 | timeout = MSEC_TO_TICK(zfs_deadman_checktime_ms); | |
2090 | zio_deadman(zio, FTAG); | |
2091 | mutex_enter(&zio->io_lock); | |
2092 | } | |
2093 | } | |
b128c09f | 2094 | mutex_exit(&zio->io_lock); |
34dc7c2f | 2095 | |
b128c09f BB |
2096 | error = zio->io_error; |
2097 | zio_destroy(zio); | |
34dc7c2f | 2098 | |
b128c09f BB |
2099 | return (error); |
2100 | } | |
34dc7c2f | 2101 | |
b128c09f BB |
2102 | void |
2103 | zio_nowait(zio_t *zio) | |
2104 | { | |
1ce23dca | 2105 | ASSERT3P(zio->io_executor, ==, NULL); |
34dc7c2f | 2106 | |
d164b209 BB |
2107 | if (zio->io_child_type == ZIO_CHILD_LOGICAL && |
2108 | zio_unique_parent(zio) == NULL) { | |
8878261f BB |
2109 | zio_t *pio; |
2110 | ||
34dc7c2f | 2111 | /* |
b128c09f | 2112 | * This is a logical async I/O with no parent to wait for it. |
9babb374 BB |
2113 | * We add it to the spa_async_root_zio "Godfather" I/O which |
2114 | * will ensure they complete prior to unloading the pool. | |
34dc7c2f | 2115 | */ |
b128c09f | 2116 | spa_t *spa = zio->io_spa; |
8878261f BB |
2117 | kpreempt_disable(); |
2118 | pio = spa->spa_async_zio_root[CPU_SEQID]; | |
2119 | kpreempt_enable(); | |
9babb374 | 2120 | |
8878261f | 2121 | zio_add_child(pio, zio); |
b128c09f | 2122 | } |
34dc7c2f | 2123 | |
3dfb57a3 DB |
2124 | ASSERT0(zio->io_queued_timestamp); |
2125 | zio->io_queued_timestamp = gethrtime(); | |
da6b4005 | 2126 | __zio_execute(zio); |
b128c09f | 2127 | } |
34dc7c2f | 2128 | |
b128c09f BB |
2129 | /* |
2130 | * ========================================================================== | |
1ce23dca | 2131 | * Reexecute, cancel, or suspend/resume failed I/O |
b128c09f BB |
2132 | * ========================================================================== |
2133 | */ | |
34dc7c2f | 2134 | |
b128c09f BB |
2135 | static void |
2136 | zio_reexecute(zio_t *pio) | |
2137 | { | |
d164b209 BB |
2138 | zio_t *cio, *cio_next; |
2139 | ||
2140 | ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); | |
2141 | ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); | |
9babb374 BB |
2142 | ASSERT(pio->io_gang_leader == NULL); |
2143 | ASSERT(pio->io_gang_tree == NULL); | |
34dc7c2f | 2144 | |
b128c09f BB |
2145 | pio->io_flags = pio->io_orig_flags; |
2146 | pio->io_stage = pio->io_orig_stage; | |
2147 | pio->io_pipeline = pio->io_orig_pipeline; | |
2148 | pio->io_reexecute = 0; | |
03c6040b | 2149 | pio->io_flags |= ZIO_FLAG_REEXECUTED; |
3dfb57a3 | 2150 | pio->io_pipeline_trace = 0; |
b128c09f | 2151 | pio->io_error = 0; |
1c27024e | 2152 | for (int w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 | 2153 | pio->io_state[w] = 0; |
1c27024e | 2154 | for (int c = 0; c < ZIO_CHILD_TYPES; c++) |
b128c09f | 2155 | pio->io_child_error[c] = 0; |
34dc7c2f | 2156 | |
428870ff BB |
2157 | if (IO_IS_ALLOCATING(pio)) |
2158 | BP_ZERO(pio->io_bp); | |
34dc7c2f | 2159 | |
b128c09f BB |
2160 | /* |
2161 | * As we reexecute pio's children, new children could be created. | |
d164b209 | 2162 | * New children go to the head of pio's io_child_list, however, |
b128c09f | 2163 | * so we will (correctly) not reexecute them. The key is that |
d164b209 BB |
2164 | * the remainder of pio's io_child_list, from 'cio_next' onward, |
2165 | * cannot be affected by any side effects of reexecuting 'cio'. | |
b128c09f | 2166 | */ |
1c27024e | 2167 | zio_link_t *zl = NULL; |
a8b2e306 | 2168 | mutex_enter(&pio->io_lock); |
3dfb57a3 DB |
2169 | for (cio = zio_walk_children(pio, &zl); cio != NULL; cio = cio_next) { |
2170 | cio_next = zio_walk_children(pio, &zl); | |
1c27024e | 2171 | for (int w = 0; w < ZIO_WAIT_TYPES; w++) |
d164b209 | 2172 | pio->io_children[cio->io_child_type][w]++; |
b128c09f | 2173 | mutex_exit(&pio->io_lock); |
d164b209 | 2174 | zio_reexecute(cio); |
a8b2e306 | 2175 | mutex_enter(&pio->io_lock); |
34dc7c2f | 2176 | } |
a8b2e306 | 2177 | mutex_exit(&pio->io_lock); |
34dc7c2f | 2178 | |
b128c09f BB |
2179 | /* |
2180 | * Now that all children have been reexecuted, execute the parent. | |
9babb374 | 2181 | * We don't reexecute "The Godfather" I/O here as it's the |
9e2c3bb4 | 2182 | * responsibility of the caller to wait on it. |
b128c09f | 2183 | */ |
3dfb57a3 DB |
2184 | if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) { |
2185 | pio->io_queued_timestamp = gethrtime(); | |
da6b4005 | 2186 | __zio_execute(pio); |
3dfb57a3 | 2187 | } |
34dc7c2f BB |
2188 | } |
2189 | ||
b128c09f | 2190 | void |
cec3a0a1 | 2191 | zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t reason) |
34dc7c2f | 2192 | { |
b128c09f BB |
2193 | if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) |
2194 | fm_panic("Pool '%s' has encountered an uncorrectable I/O " | |
2195 | "failure and the failure mode property for this pool " | |
2196 | "is set to panic.", spa_name(spa)); | |
34dc7c2f | 2197 | |
bf89c199 BB |
2198 | cmn_err(CE_WARN, "Pool '%s' has encountered an uncorrectable I/O " |
2199 | "failure and has been suspended.\n", spa_name(spa)); | |
2200 | ||
b5256303 TC |
2201 | zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, |
2202 | NULL, NULL, 0, 0); | |
34dc7c2f | 2203 | |
b128c09f | 2204 | mutex_enter(&spa->spa_suspend_lock); |
34dc7c2f | 2205 | |
b128c09f | 2206 | if (spa->spa_suspend_zio_root == NULL) |
9babb374 BB |
2207 | spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, |
2208 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | | |
2209 | ZIO_FLAG_GODFATHER); | |
34dc7c2f | 2210 | |
cec3a0a1 | 2211 | spa->spa_suspended = reason; |
34dc7c2f | 2212 | |
b128c09f | 2213 | if (zio != NULL) { |
9babb374 | 2214 | ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); |
b128c09f BB |
2215 | ASSERT(zio != spa->spa_suspend_zio_root); |
2216 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
d164b209 | 2217 | ASSERT(zio_unique_parent(zio) == NULL); |
b128c09f BB |
2218 | ASSERT(zio->io_stage == ZIO_STAGE_DONE); |
2219 | zio_add_child(spa->spa_suspend_zio_root, zio); | |
2220 | } | |
34dc7c2f | 2221 | |
b128c09f BB |
2222 | mutex_exit(&spa->spa_suspend_lock); |
2223 | } | |
34dc7c2f | 2224 | |
9babb374 | 2225 | int |
b128c09f BB |
2226 | zio_resume(spa_t *spa) |
2227 | { | |
9babb374 | 2228 | zio_t *pio; |
34dc7c2f BB |
2229 | |
2230 | /* | |
b128c09f | 2231 | * Reexecute all previously suspended i/o. |
34dc7c2f | 2232 | */ |
b128c09f | 2233 | mutex_enter(&spa->spa_suspend_lock); |
cec3a0a1 | 2234 | spa->spa_suspended = ZIO_SUSPEND_NONE; |
b128c09f BB |
2235 | cv_broadcast(&spa->spa_suspend_cv); |
2236 | pio = spa->spa_suspend_zio_root; | |
2237 | spa->spa_suspend_zio_root = NULL; | |
2238 | mutex_exit(&spa->spa_suspend_lock); | |
2239 | ||
2240 | if (pio == NULL) | |
9babb374 | 2241 | return (0); |
34dc7c2f | 2242 | |
9babb374 BB |
2243 | zio_reexecute(pio); |
2244 | return (zio_wait(pio)); | |
b128c09f BB |
2245 | } |
2246 | ||
2247 | void | |
2248 | zio_resume_wait(spa_t *spa) | |
2249 | { | |
2250 | mutex_enter(&spa->spa_suspend_lock); | |
2251 | while (spa_suspended(spa)) | |
2252 | cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); | |
2253 | mutex_exit(&spa->spa_suspend_lock); | |
34dc7c2f BB |
2254 | } |
2255 | ||
2256 | /* | |
2257 | * ========================================================================== | |
b128c09f BB |
2258 | * Gang blocks. |
2259 | * | |
2260 | * A gang block is a collection of small blocks that looks to the DMU | |
2261 | * like one large block. When zio_dva_allocate() cannot find a block | |
2262 | * of the requested size, due to either severe fragmentation or the pool | |
2263 | * being nearly full, it calls zio_write_gang_block() to construct the | |
2264 | * block from smaller fragments. | |
2265 | * | |
2266 | * A gang block consists of a gang header (zio_gbh_phys_t) and up to | |
2267 | * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like | |
2268 | * an indirect block: it's an array of block pointers. It consumes | |
2269 | * only one sector and hence is allocatable regardless of fragmentation. | |
2270 | * The gang header's bps point to its gang members, which hold the data. | |
2271 | * | |
2272 | * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> | |
2273 | * as the verifier to ensure uniqueness of the SHA256 checksum. | |
2274 | * Critically, the gang block bp's blk_cksum is the checksum of the data, | |
2275 | * not the gang header. This ensures that data block signatures (needed for | |
2276 | * deduplication) are independent of how the block is physically stored. | |
2277 | * | |
2278 | * Gang blocks can be nested: a gang member may itself be a gang block. | |
2279 | * Thus every gang block is a tree in which root and all interior nodes are | |
2280 | * gang headers, and the leaves are normal blocks that contain user data. | |
2281 | * The root of the gang tree is called the gang leader. | |
2282 | * | |
2283 | * To perform any operation (read, rewrite, free, claim) on a gang block, | |
2284 | * zio_gang_assemble() first assembles the gang tree (minus data leaves) | |
2285 | * in the io_gang_tree field of the original logical i/o by recursively | |
2286 | * reading the gang leader and all gang headers below it. This yields | |
2287 | * an in-core tree containing the contents of every gang header and the | |
2288 | * bps for every constituent of the gang block. | |
2289 | * | |
2290 | * With the gang tree now assembled, zio_gang_issue() just walks the gang tree | |
2291 | * and invokes a callback on each bp. To free a gang block, zio_gang_issue() | |
2292 | * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. | |
2293 | * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). | |
2294 | * zio_read_gang() is a wrapper around zio_read() that omits reading gang | |
2295 | * headers, since we already have those in io_gang_tree. zio_rewrite_gang() | |
2296 | * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() | |
2297 | * of the gang header plus zio_checksum_compute() of the data to update the | |
2298 | * gang header's blk_cksum as described above. | |
2299 | * | |
2300 | * The two-phase assemble/issue model solves the problem of partial failure -- | |
2301 | * what if you'd freed part of a gang block but then couldn't read the | |
2302 | * gang header for another part? Assembling the entire gang tree first | |
2303 | * ensures that all the necessary gang header I/O has succeeded before | |
2304 | * starting the actual work of free, claim, or write. Once the gang tree | |
2305 | * is assembled, free and claim are in-memory operations that cannot fail. | |
2306 | * | |
2307 | * In the event that a gang write fails, zio_dva_unallocate() walks the | |
2308 | * gang tree to immediately free (i.e. insert back into the space map) | |
2309 | * everything we've allocated. This ensures that we don't get ENOSPC | |
2310 | * errors during repeated suspend/resume cycles due to a flaky device. | |
2311 | * | |
2312 | * Gang rewrites only happen during sync-to-convergence. If we can't assemble | |
2313 | * the gang tree, we won't modify the block, so we can safely defer the free | |
2314 | * (knowing that the block is still intact). If we *can* assemble the gang | |
2315 | * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free | |
2316 | * each constituent bp and we can allocate a new block on the next sync pass. | |
2317 | * | |
2318 | * In all cases, the gang tree allows complete recovery from partial failure. | |
34dc7c2f BB |
2319 | * ========================================================================== |
2320 | */ | |
b128c09f | 2321 | |
a6255b7f DQ |
2322 | static void |
2323 | zio_gang_issue_func_done(zio_t *zio) | |
2324 | { | |
2325 | abd_put(zio->io_abd); | |
2326 | } | |
2327 | ||
b128c09f | 2328 | static zio_t * |
a6255b7f DQ |
2329 | zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data, |
2330 | uint64_t offset) | |
34dc7c2f | 2331 | { |
b128c09f BB |
2332 | if (gn != NULL) |
2333 | return (pio); | |
34dc7c2f | 2334 | |
a6255b7f DQ |
2335 | return (zio_read(pio, pio->io_spa, bp, abd_get_offset(data, offset), |
2336 | BP_GET_PSIZE(bp), zio_gang_issue_func_done, | |
2337 | NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), | |
b128c09f BB |
2338 | &pio->io_bookmark)); |
2339 | } | |
2340 | ||
a6255b7f DQ |
2341 | static zio_t * |
2342 | zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data, | |
2343 | uint64_t offset) | |
b128c09f BB |
2344 | { |
2345 | zio_t *zio; | |
2346 | ||
2347 | if (gn != NULL) { | |
a6255b7f DQ |
2348 | abd_t *gbh_abd = |
2349 | abd_get_from_buf(gn->gn_gbh, SPA_GANGBLOCKSIZE); | |
b128c09f | 2350 | zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, |
a6255b7f DQ |
2351 | gbh_abd, SPA_GANGBLOCKSIZE, zio_gang_issue_func_done, NULL, |
2352 | pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), | |
2353 | &pio->io_bookmark); | |
34dc7c2f | 2354 | /* |
b128c09f BB |
2355 | * As we rewrite each gang header, the pipeline will compute |
2356 | * a new gang block header checksum for it; but no one will | |
2357 | * compute a new data checksum, so we do that here. The one | |
2358 | * exception is the gang leader: the pipeline already computed | |
2359 | * its data checksum because that stage precedes gang assembly. | |
2360 | * (Presently, nothing actually uses interior data checksums; | |
2361 | * this is just good hygiene.) | |
34dc7c2f | 2362 | */ |
9babb374 | 2363 | if (gn != pio->io_gang_leader->io_gang_tree) { |
a6255b7f DQ |
2364 | abd_t *buf = abd_get_offset(data, offset); |
2365 | ||
b128c09f | 2366 | zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), |
a6255b7f DQ |
2367 | buf, BP_GET_PSIZE(bp)); |
2368 | ||
2369 | abd_put(buf); | |
b128c09f | 2370 | } |
428870ff BB |
2371 | /* |
2372 | * If we are here to damage data for testing purposes, | |
2373 | * leave the GBH alone so that we can detect the damage. | |
2374 | */ | |
2375 | if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) | |
2376 | zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; | |
34dc7c2f | 2377 | } else { |
b128c09f | 2378 | zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, |
a6255b7f DQ |
2379 | abd_get_offset(data, offset), BP_GET_PSIZE(bp), |
2380 | zio_gang_issue_func_done, NULL, pio->io_priority, | |
b128c09f | 2381 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); |
34dc7c2f BB |
2382 | } |
2383 | ||
b128c09f BB |
2384 | return (zio); |
2385 | } | |
34dc7c2f | 2386 | |
b128c09f | 2387 | /* ARGSUSED */ |
a6255b7f DQ |
2388 | static zio_t * |
2389 | zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data, | |
2390 | uint64_t offset) | |
b128c09f | 2391 | { |
428870ff BB |
2392 | return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, |
2393 | ZIO_GANG_CHILD_FLAGS(pio))); | |
34dc7c2f BB |
2394 | } |
2395 | ||
b128c09f | 2396 | /* ARGSUSED */ |
a6255b7f DQ |
2397 | static zio_t * |
2398 | zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data, | |
2399 | uint64_t offset) | |
34dc7c2f | 2400 | { |
b128c09f BB |
2401 | return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, |
2402 | NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); | |
2403 | } | |
2404 | ||
2405 | static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { | |
2406 | NULL, | |
2407 | zio_read_gang, | |
2408 | zio_rewrite_gang, | |
2409 | zio_free_gang, | |
2410 | zio_claim_gang, | |
2411 | NULL | |
2412 | }; | |
34dc7c2f | 2413 | |
b128c09f | 2414 | static void zio_gang_tree_assemble_done(zio_t *zio); |
34dc7c2f | 2415 | |
b128c09f BB |
2416 | static zio_gang_node_t * |
2417 | zio_gang_node_alloc(zio_gang_node_t **gnpp) | |
2418 | { | |
2419 | zio_gang_node_t *gn; | |
34dc7c2f | 2420 | |
b128c09f | 2421 | ASSERT(*gnpp == NULL); |
34dc7c2f | 2422 | |
79c76d5b | 2423 | gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); |
b128c09f BB |
2424 | gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); |
2425 | *gnpp = gn; | |
34dc7c2f | 2426 | |
b128c09f | 2427 | return (gn); |
34dc7c2f BB |
2428 | } |
2429 | ||
34dc7c2f | 2430 | static void |
b128c09f | 2431 | zio_gang_node_free(zio_gang_node_t **gnpp) |
34dc7c2f | 2432 | { |
b128c09f | 2433 | zio_gang_node_t *gn = *gnpp; |
34dc7c2f | 2434 | |
1c27024e | 2435 | for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) |
b128c09f BB |
2436 | ASSERT(gn->gn_child[g] == NULL); |
2437 | ||
2438 | zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); | |
2439 | kmem_free(gn, sizeof (*gn)); | |
2440 | *gnpp = NULL; | |
34dc7c2f BB |
2441 | } |
2442 | ||
b128c09f BB |
2443 | static void |
2444 | zio_gang_tree_free(zio_gang_node_t **gnpp) | |
34dc7c2f | 2445 | { |
b128c09f | 2446 | zio_gang_node_t *gn = *gnpp; |
34dc7c2f | 2447 | |
b128c09f BB |
2448 | if (gn == NULL) |
2449 | return; | |
34dc7c2f | 2450 | |
1c27024e | 2451 | for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) |
b128c09f | 2452 | zio_gang_tree_free(&gn->gn_child[g]); |
34dc7c2f | 2453 | |
b128c09f | 2454 | zio_gang_node_free(gnpp); |
34dc7c2f BB |
2455 | } |
2456 | ||
b128c09f | 2457 | static void |
9babb374 | 2458 | zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) |
34dc7c2f | 2459 | { |
b128c09f | 2460 | zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); |
a6255b7f | 2461 | abd_t *gbh_abd = abd_get_from_buf(gn->gn_gbh, SPA_GANGBLOCKSIZE); |
b128c09f | 2462 | |
9babb374 | 2463 | ASSERT(gio->io_gang_leader == gio); |
b128c09f | 2464 | ASSERT(BP_IS_GANG(bp)); |
34dc7c2f | 2465 | |
a6255b7f DQ |
2466 | zio_nowait(zio_read(gio, gio->io_spa, bp, gbh_abd, SPA_GANGBLOCKSIZE, |
2467 | zio_gang_tree_assemble_done, gn, gio->io_priority, | |
2468 | ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); | |
b128c09f | 2469 | } |
34dc7c2f | 2470 | |
b128c09f BB |
2471 | static void |
2472 | zio_gang_tree_assemble_done(zio_t *zio) | |
2473 | { | |
9babb374 | 2474 | zio_t *gio = zio->io_gang_leader; |
b128c09f BB |
2475 | zio_gang_node_t *gn = zio->io_private; |
2476 | blkptr_t *bp = zio->io_bp; | |
34dc7c2f | 2477 | |
9babb374 | 2478 | ASSERT(gio == zio_unique_parent(zio)); |
428870ff | 2479 | ASSERT(zio->io_child_count == 0); |
34dc7c2f | 2480 | |
b128c09f BB |
2481 | if (zio->io_error) |
2482 | return; | |
34dc7c2f | 2483 | |
a6255b7f | 2484 | /* this ABD was created from a linear buf in zio_gang_tree_assemble */ |
b128c09f | 2485 | if (BP_SHOULD_BYTESWAP(bp)) |
a6255b7f | 2486 | byteswap_uint64_array(abd_to_buf(zio->io_abd), zio->io_size); |
34dc7c2f | 2487 | |
a6255b7f | 2488 | ASSERT3P(abd_to_buf(zio->io_abd), ==, gn->gn_gbh); |
b128c09f | 2489 | ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); |
428870ff | 2490 | ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); |
34dc7c2f | 2491 | |
a6255b7f DQ |
2492 | abd_put(zio->io_abd); |
2493 | ||
1c27024e | 2494 | for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
2495 | blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; |
2496 | if (!BP_IS_GANG(gbp)) | |
2497 | continue; | |
9babb374 | 2498 | zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); |
b128c09f | 2499 | } |
34dc7c2f BB |
2500 | } |
2501 | ||
b128c09f | 2502 | static void |
a6255b7f DQ |
2503 | zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, abd_t *data, |
2504 | uint64_t offset) | |
34dc7c2f | 2505 | { |
9babb374 | 2506 | zio_t *gio = pio->io_gang_leader; |
b128c09f | 2507 | zio_t *zio; |
34dc7c2f | 2508 | |
b128c09f | 2509 | ASSERT(BP_IS_GANG(bp) == !!gn); |
9babb374 BB |
2510 | ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); |
2511 | ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); | |
34dc7c2f | 2512 | |
b128c09f BB |
2513 | /* |
2514 | * If you're a gang header, your data is in gn->gn_gbh. | |
2515 | * If you're a gang member, your data is in 'data' and gn == NULL. | |
2516 | */ | |
a6255b7f | 2517 | zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data, offset); |
34dc7c2f | 2518 | |
b128c09f | 2519 | if (gn != NULL) { |
428870ff | 2520 | ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); |
34dc7c2f | 2521 | |
1c27024e | 2522 | for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
2523 | blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; |
2524 | if (BP_IS_HOLE(gbp)) | |
2525 | continue; | |
a6255b7f DQ |
2526 | zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data, |
2527 | offset); | |
2528 | offset += BP_GET_PSIZE(gbp); | |
b128c09f | 2529 | } |
34dc7c2f BB |
2530 | } |
2531 | ||
9babb374 | 2532 | if (gn == gio->io_gang_tree) |
a6255b7f | 2533 | ASSERT3U(gio->io_size, ==, offset); |
34dc7c2f | 2534 | |
b128c09f BB |
2535 | if (zio != pio) |
2536 | zio_nowait(zio); | |
34dc7c2f BB |
2537 | } |
2538 | ||
62840030 | 2539 | static zio_t * |
b128c09f | 2540 | zio_gang_assemble(zio_t *zio) |
34dc7c2f | 2541 | { |
b128c09f | 2542 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 2543 | |
9babb374 BB |
2544 | ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); |
2545 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
2546 | ||
2547 | zio->io_gang_leader = zio; | |
34dc7c2f | 2548 | |
b128c09f | 2549 | zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); |
34dc7c2f | 2550 | |
62840030 | 2551 | return (zio); |
34dc7c2f BB |
2552 | } |
2553 | ||
62840030 | 2554 | static zio_t * |
b128c09f | 2555 | zio_gang_issue(zio_t *zio) |
34dc7c2f | 2556 | { |
b128c09f | 2557 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 2558 | |
ddc751d5 | 2559 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG_BIT, ZIO_WAIT_DONE)) { |
62840030 | 2560 | return (NULL); |
ddc751d5 | 2561 | } |
34dc7c2f | 2562 | |
9babb374 BB |
2563 | ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); |
2564 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
34dc7c2f | 2565 | |
b128c09f | 2566 | if (zio->io_child_error[ZIO_CHILD_GANG] == 0) |
a6255b7f DQ |
2567 | zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_abd, |
2568 | 0); | |
b128c09f | 2569 | else |
9babb374 | 2570 | zio_gang_tree_free(&zio->io_gang_tree); |
34dc7c2f | 2571 | |
b128c09f | 2572 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
34dc7c2f | 2573 | |
62840030 | 2574 | return (zio); |
34dc7c2f BB |
2575 | } |
2576 | ||
2577 | static void | |
b128c09f | 2578 | zio_write_gang_member_ready(zio_t *zio) |
34dc7c2f | 2579 | { |
d164b209 | 2580 | zio_t *pio = zio_unique_parent(zio); |
34dc7c2f BB |
2581 | dva_t *cdva = zio->io_bp->blk_dva; |
2582 | dva_t *pdva = pio->io_bp->blk_dva; | |
2583 | uint64_t asize; | |
d1d7e268 | 2584 | ASSERTV(zio_t *gio = zio->io_gang_leader); |
34dc7c2f | 2585 | |
b128c09f BB |
2586 | if (BP_IS_HOLE(zio->io_bp)) |
2587 | return; | |
2588 | ||
2589 | ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); | |
2590 | ||
2591 | ASSERT(zio->io_child_type == ZIO_CHILD_GANG); | |
428870ff BB |
2592 | ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); |
2593 | ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); | |
2594 | ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); | |
34dc7c2f | 2595 | ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); |
34dc7c2f BB |
2596 | |
2597 | mutex_enter(&pio->io_lock); | |
1c27024e | 2598 | for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { |
34dc7c2f BB |
2599 | ASSERT(DVA_GET_GANG(&pdva[d])); |
2600 | asize = DVA_GET_ASIZE(&pdva[d]); | |
2601 | asize += DVA_GET_ASIZE(&cdva[d]); | |
2602 | DVA_SET_ASIZE(&pdva[d], asize); | |
2603 | } | |
2604 | mutex_exit(&pio->io_lock); | |
2605 | } | |
2606 | ||
a6255b7f DQ |
2607 | static void |
2608 | zio_write_gang_done(zio_t *zio) | |
2609 | { | |
c955398b BL |
2610 | /* |
2611 | * The io_abd field will be NULL for a zio with no data. The io_flags | |
2612 | * will initially have the ZIO_FLAG_NODATA bit flag set, but we can't | |
2613 | * check for it here as it is cleared in zio_ready. | |
2614 | */ | |
2615 | if (zio->io_abd != NULL) | |
2616 | abd_put(zio->io_abd); | |
a6255b7f DQ |
2617 | } |
2618 | ||
62840030 | 2619 | static zio_t * |
b128c09f | 2620 | zio_write_gang_block(zio_t *pio) |
34dc7c2f | 2621 | { |
b128c09f | 2622 | spa_t *spa = pio->io_spa; |
3dfb57a3 | 2623 | metaslab_class_t *mc = spa_normal_class(spa); |
b128c09f | 2624 | blkptr_t *bp = pio->io_bp; |
9babb374 | 2625 | zio_t *gio = pio->io_gang_leader; |
b128c09f BB |
2626 | zio_t *zio; |
2627 | zio_gang_node_t *gn, **gnpp; | |
34dc7c2f | 2628 | zio_gbh_phys_t *gbh; |
a6255b7f | 2629 | abd_t *gbh_abd; |
b128c09f BB |
2630 | uint64_t txg = pio->io_txg; |
2631 | uint64_t resid = pio->io_size; | |
2632 | uint64_t lsize; | |
428870ff | 2633 | int copies = gio->io_prop.zp_copies; |
b5256303 | 2634 | int gbh_copies; |
b128c09f | 2635 | zio_prop_t zp; |
1c27024e | 2636 | int error; |
c955398b | 2637 | boolean_t has_data = !(pio->io_flags & ZIO_FLAG_NODATA); |
b5256303 TC |
2638 | |
2639 | /* | |
2640 | * encrypted blocks need DVA[2] free so encrypted gang headers can't | |
2641 | * have a third copy. | |
2642 | */ | |
2643 | gbh_copies = MIN(copies + 1, spa_max_replication(spa)); | |
2644 | if (gio->io_prop.zp_encrypt && gbh_copies >= SPA_DVAS_PER_BP) | |
2645 | gbh_copies = SPA_DVAS_PER_BP - 1; | |
2646 | ||
1c27024e | 2647 | int flags = METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER; |
3dfb57a3 DB |
2648 | if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) { |
2649 | ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); | |
c955398b | 2650 | ASSERT(has_data); |
3dfb57a3 DB |
2651 | |
2652 | flags |= METASLAB_ASYNC_ALLOC; | |
424fd7c3 | 2653 | VERIFY(zfs_refcount_held(&mc->mc_alloc_slots[pio->io_allocator], |
492f64e9 | 2654 | pio)); |
3dfb57a3 DB |
2655 | |
2656 | /* | |
2657 | * The logical zio has already placed a reservation for | |
2658 | * 'copies' allocation slots but gang blocks may require | |
2659 | * additional copies. These additional copies | |
2660 | * (i.e. gbh_copies - copies) are guaranteed to succeed | |
2661 | * since metaslab_class_throttle_reserve() always allows | |
2662 | * additional reservations for gang blocks. | |
2663 | */ | |
2664 | VERIFY(metaslab_class_throttle_reserve(mc, gbh_copies - copies, | |
492f64e9 | 2665 | pio->io_allocator, pio, flags)); |
3dfb57a3 DB |
2666 | } |
2667 | ||
2668 | error = metaslab_alloc(spa, mc, SPA_GANGBLOCKSIZE, | |
4e21fd06 | 2669 | bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, flags, |
492f64e9 | 2670 | &pio->io_alloc_list, pio, pio->io_allocator); |
34dc7c2f | 2671 | if (error) { |
3dfb57a3 DB |
2672 | if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) { |
2673 | ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); | |
c955398b | 2674 | ASSERT(has_data); |
3dfb57a3 DB |
2675 | |
2676 | /* | |
2677 | * If we failed to allocate the gang block header then | |
2678 | * we remove any additional allocation reservations that | |
2679 | * we placed here. The original reservation will | |
2680 | * be removed when the logical I/O goes to the ready | |
2681 | * stage. | |
2682 | */ | |
2683 | metaslab_class_throttle_unreserve(mc, | |
492f64e9 | 2684 | gbh_copies - copies, pio->io_allocator, pio); |
3dfb57a3 DB |
2685 | } |
2686 | ||
b128c09f | 2687 | pio->io_error = error; |
62840030 | 2688 | return (pio); |
34dc7c2f BB |
2689 | } |
2690 | ||
9babb374 BB |
2691 | if (pio == gio) { |
2692 | gnpp = &gio->io_gang_tree; | |
b128c09f BB |
2693 | } else { |
2694 | gnpp = pio->io_private; | |
2695 | ASSERT(pio->io_ready == zio_write_gang_member_ready); | |
34dc7c2f BB |
2696 | } |
2697 | ||
b128c09f BB |
2698 | gn = zio_gang_node_alloc(gnpp); |
2699 | gbh = gn->gn_gbh; | |
2700 | bzero(gbh, SPA_GANGBLOCKSIZE); | |
a6255b7f | 2701 | gbh_abd = abd_get_from_buf(gbh, SPA_GANGBLOCKSIZE); |
34dc7c2f | 2702 | |
b128c09f BB |
2703 | /* |
2704 | * Create the gang header. | |
2705 | */ | |
a6255b7f DQ |
2706 | zio = zio_rewrite(pio, spa, txg, bp, gbh_abd, SPA_GANGBLOCKSIZE, |
2707 | zio_write_gang_done, NULL, pio->io_priority, | |
2708 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); | |
34dc7c2f | 2709 | |
b128c09f BB |
2710 | /* |
2711 | * Create and nowait the gang children. | |
2712 | */ | |
1c27024e | 2713 | for (int g = 0; resid != 0; resid -= lsize, g++) { |
b128c09f BB |
2714 | lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), |
2715 | SPA_MINBLOCKSIZE); | |
2716 | ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); | |
2717 | ||
9babb374 | 2718 | zp.zp_checksum = gio->io_prop.zp_checksum; |
b128c09f BB |
2719 | zp.zp_compress = ZIO_COMPRESS_OFF; |
2720 | zp.zp_type = DMU_OT_NONE; | |
2721 | zp.zp_level = 0; | |
428870ff | 2722 | zp.zp_copies = gio->io_prop.zp_copies; |
03c6040b GW |
2723 | zp.zp_dedup = B_FALSE; |
2724 | zp.zp_dedup_verify = B_FALSE; | |
2725 | zp.zp_nopwrite = B_FALSE; | |
4807c0ba TC |
2726 | zp.zp_encrypt = gio->io_prop.zp_encrypt; |
2727 | zp.zp_byteorder = gio->io_prop.zp_byteorder; | |
b5256303 TC |
2728 | bzero(zp.zp_salt, ZIO_DATA_SALT_LEN); |
2729 | bzero(zp.zp_iv, ZIO_DATA_IV_LEN); | |
2730 | bzero(zp.zp_mac, ZIO_DATA_MAC_LEN); | |
b128c09f | 2731 | |
1c27024e | 2732 | zio_t *cio = zio_write(zio, spa, txg, &gbh->zg_blkptr[g], |
c955398b BL |
2733 | has_data ? abd_get_offset(pio->io_abd, pio->io_size - |
2734 | resid) : NULL, lsize, lsize, &zp, | |
2735 | zio_write_gang_member_ready, NULL, NULL, | |
a6255b7f | 2736 | zio_write_gang_done, &gn->gn_child[g], pio->io_priority, |
3dfb57a3 DB |
2737 | ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); |
2738 | ||
2739 | if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) { | |
2740 | ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); | |
c955398b | 2741 | ASSERT(has_data); |
3dfb57a3 DB |
2742 | |
2743 | /* | |
2744 | * Gang children won't throttle but we should | |
2745 | * account for their work, so reserve an allocation | |
2746 | * slot for them here. | |
2747 | */ | |
2748 | VERIFY(metaslab_class_throttle_reserve(mc, | |
492f64e9 | 2749 | zp.zp_copies, cio->io_allocator, cio, flags)); |
3dfb57a3 DB |
2750 | } |
2751 | zio_nowait(cio); | |
b128c09f | 2752 | } |
34dc7c2f BB |
2753 | |
2754 | /* | |
b128c09f | 2755 | * Set pio's pipeline to just wait for zio to finish. |
34dc7c2f | 2756 | */ |
b128c09f BB |
2757 | pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
2758 | ||
920dd524 ED |
2759 | /* |
2760 | * We didn't allocate this bp, so make sure it doesn't get unmarked. | |
2761 | */ | |
2762 | pio->io_flags &= ~ZIO_FLAG_FASTWRITE; | |
2763 | ||
b128c09f BB |
2764 | zio_nowait(zio); |
2765 | ||
62840030 | 2766 | return (pio); |
34dc7c2f BB |
2767 | } |
2768 | ||
03c6040b | 2769 | /* |
3c67d83a TH |
2770 | * The zio_nop_write stage in the pipeline determines if allocating a |
2771 | * new bp is necessary. The nopwrite feature can handle writes in | |
2772 | * either syncing or open context (i.e. zil writes) and as a result is | |
2773 | * mutually exclusive with dedup. | |
2774 | * | |
2775 | * By leveraging a cryptographically secure checksum, such as SHA256, we | |
2776 | * can compare the checksums of the new data and the old to determine if | |
2777 | * allocating a new block is required. Note that our requirements for | |
2778 | * cryptographic strength are fairly weak: there can't be any accidental | |
2779 | * hash collisions, but we don't need to be secure against intentional | |
2780 | * (malicious) collisions. To trigger a nopwrite, you have to be able | |
2781 | * to write the file to begin with, and triggering an incorrect (hash | |
2782 | * collision) nopwrite is no worse than simply writing to the file. | |
2783 | * That said, there are no known attacks against the checksum algorithms | |
2784 | * used for nopwrite, assuming that the salt and the checksums | |
2785 | * themselves remain secret. | |
03c6040b | 2786 | */ |
62840030 | 2787 | static zio_t * |
03c6040b GW |
2788 | zio_nop_write(zio_t *zio) |
2789 | { | |
2790 | blkptr_t *bp = zio->io_bp; | |
2791 | blkptr_t *bp_orig = &zio->io_bp_orig; | |
2792 | zio_prop_t *zp = &zio->io_prop; | |
2793 | ||
2794 | ASSERT(BP_GET_LEVEL(bp) == 0); | |
2795 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); | |
2796 | ASSERT(zp->zp_nopwrite); | |
2797 | ASSERT(!zp->zp_dedup); | |
2798 | ASSERT(zio->io_bp_override == NULL); | |
2799 | ASSERT(IO_IS_ALLOCATING(zio)); | |
2800 | ||
2801 | /* | |
2802 | * Check to see if the original bp and the new bp have matching | |
2803 | * characteristics (i.e. same checksum, compression algorithms, etc). | |
2804 | * If they don't then just continue with the pipeline which will | |
2805 | * allocate a new bp. | |
2806 | */ | |
2807 | if (BP_IS_HOLE(bp_orig) || | |
3c67d83a TH |
2808 | !(zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_flags & |
2809 | ZCHECKSUM_FLAG_NOPWRITE) || | |
b5256303 | 2810 | BP_IS_ENCRYPTED(bp) || BP_IS_ENCRYPTED(bp_orig) || |
03c6040b GW |
2811 | BP_GET_CHECKSUM(bp) != BP_GET_CHECKSUM(bp_orig) || |
2812 | BP_GET_COMPRESS(bp) != BP_GET_COMPRESS(bp_orig) || | |
2813 | BP_GET_DEDUP(bp) != BP_GET_DEDUP(bp_orig) || | |
2814 | zp->zp_copies != BP_GET_NDVAS(bp_orig)) | |
62840030 | 2815 | return (zio); |
03c6040b GW |
2816 | |
2817 | /* | |
2818 | * If the checksums match then reset the pipeline so that we | |
2819 | * avoid allocating a new bp and issuing any I/O. | |
2820 | */ | |
2821 | if (ZIO_CHECKSUM_EQUAL(bp->blk_cksum, bp_orig->blk_cksum)) { | |
3c67d83a TH |
2822 | ASSERT(zio_checksum_table[zp->zp_checksum].ci_flags & |
2823 | ZCHECKSUM_FLAG_NOPWRITE); | |
03c6040b GW |
2824 | ASSERT3U(BP_GET_PSIZE(bp), ==, BP_GET_PSIZE(bp_orig)); |
2825 | ASSERT3U(BP_GET_LSIZE(bp), ==, BP_GET_LSIZE(bp_orig)); | |
2826 | ASSERT(zp->zp_compress != ZIO_COMPRESS_OFF); | |
2827 | ASSERT(bcmp(&bp->blk_prop, &bp_orig->blk_prop, | |
2828 | sizeof (uint64_t)) == 0); | |
2829 | ||
2830 | *bp = *bp_orig; | |
2831 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
2832 | zio->io_flags |= ZIO_FLAG_NOPWRITE; | |
2833 | } | |
2834 | ||
62840030 | 2835 | return (zio); |
03c6040b GW |
2836 | } |
2837 | ||
34dc7c2f BB |
2838 | /* |
2839 | * ========================================================================== | |
428870ff | 2840 | * Dedup |
34dc7c2f BB |
2841 | * ========================================================================== |
2842 | */ | |
428870ff BB |
2843 | static void |
2844 | zio_ddt_child_read_done(zio_t *zio) | |
2845 | { | |
2846 | blkptr_t *bp = zio->io_bp; | |
2847 | ddt_entry_t *dde = zio->io_private; | |
2848 | ddt_phys_t *ddp; | |
2849 | zio_t *pio = zio_unique_parent(zio); | |
2850 | ||
2851 | mutex_enter(&pio->io_lock); | |
2852 | ddp = ddt_phys_select(dde, bp); | |
2853 | if (zio->io_error == 0) | |
2854 | ddt_phys_clear(ddp); /* this ddp doesn't need repair */ | |
a6255b7f DQ |
2855 | |
2856 | if (zio->io_error == 0 && dde->dde_repair_abd == NULL) | |
2857 | dde->dde_repair_abd = zio->io_abd; | |
428870ff | 2858 | else |
a6255b7f | 2859 | abd_free(zio->io_abd); |
428870ff BB |
2860 | mutex_exit(&pio->io_lock); |
2861 | } | |
2862 | ||
62840030 | 2863 | static zio_t * |
428870ff BB |
2864 | zio_ddt_read_start(zio_t *zio) |
2865 | { | |
2866 | blkptr_t *bp = zio->io_bp; | |
2867 | ||
2868 | ASSERT(BP_GET_DEDUP(bp)); | |
2869 | ASSERT(BP_GET_PSIZE(bp) == zio->io_size); | |
2870 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
2871 | ||
2872 | if (zio->io_child_error[ZIO_CHILD_DDT]) { | |
2873 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
2874 | ddt_entry_t *dde = ddt_repair_start(ddt, bp); | |
2875 | ddt_phys_t *ddp = dde->dde_phys; | |
2876 | ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); | |
2877 | blkptr_t blk; | |
2878 | ||
2879 | ASSERT(zio->io_vsd == NULL); | |
2880 | zio->io_vsd = dde; | |
2881 | ||
2882 | if (ddp_self == NULL) | |
62840030 | 2883 | return (zio); |
428870ff | 2884 | |
1c27024e | 2885 | for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
428870ff BB |
2886 | if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) |
2887 | continue; | |
2888 | ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, | |
2889 | &blk); | |
2890 | zio_nowait(zio_read(zio, zio->io_spa, &blk, | |
a6255b7f DQ |
2891 | abd_alloc_for_io(zio->io_size, B_TRUE), |
2892 | zio->io_size, zio_ddt_child_read_done, dde, | |
2893 | zio->io_priority, ZIO_DDT_CHILD_FLAGS(zio) | | |
2894 | ZIO_FLAG_DONT_PROPAGATE, &zio->io_bookmark)); | |
428870ff | 2895 | } |
62840030 | 2896 | return (zio); |
428870ff BB |
2897 | } |
2898 | ||
2899 | zio_nowait(zio_read(zio, zio->io_spa, bp, | |
a6255b7f | 2900 | zio->io_abd, zio->io_size, NULL, NULL, zio->io_priority, |
428870ff BB |
2901 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); |
2902 | ||
62840030 | 2903 | return (zio); |
428870ff BB |
2904 | } |
2905 | ||
62840030 | 2906 | static zio_t * |
428870ff BB |
2907 | zio_ddt_read_done(zio_t *zio) |
2908 | { | |
2909 | blkptr_t *bp = zio->io_bp; | |
2910 | ||
ddc751d5 | 2911 | if (zio_wait_for_children(zio, ZIO_CHILD_DDT_BIT, ZIO_WAIT_DONE)) { |
62840030 | 2912 | return (NULL); |
ddc751d5 | 2913 | } |
428870ff BB |
2914 | |
2915 | ASSERT(BP_GET_DEDUP(bp)); | |
2916 | ASSERT(BP_GET_PSIZE(bp) == zio->io_size); | |
2917 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
2918 | ||
2919 | if (zio->io_child_error[ZIO_CHILD_DDT]) { | |
2920 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
2921 | ddt_entry_t *dde = zio->io_vsd; | |
2922 | if (ddt == NULL) { | |
2923 | ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE); | |
62840030 | 2924 | return (zio); |
428870ff BB |
2925 | } |
2926 | if (dde == NULL) { | |
2927 | zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; | |
2928 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); | |
62840030 | 2929 | return (NULL); |
428870ff | 2930 | } |
a6255b7f DQ |
2931 | if (dde->dde_repair_abd != NULL) { |
2932 | abd_copy(zio->io_abd, dde->dde_repair_abd, | |
2933 | zio->io_size); | |
428870ff BB |
2934 | zio->io_child_error[ZIO_CHILD_DDT] = 0; |
2935 | } | |
2936 | ddt_repair_done(ddt, dde); | |
2937 | zio->io_vsd = NULL; | |
2938 | } | |
2939 | ||
2940 | ASSERT(zio->io_vsd == NULL); | |
2941 | ||
62840030 | 2942 | return (zio); |
428870ff BB |
2943 | } |
2944 | ||
2945 | static boolean_t | |
2946 | zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) | |
2947 | { | |
2948 | spa_t *spa = zio->io_spa; | |
c17bcf83 | 2949 | boolean_t do_raw = !!(zio->io_flags & ZIO_FLAG_RAW); |
428870ff | 2950 | |
c17bcf83 | 2951 | ASSERT(!(zio->io_bp_override && do_raw)); |
2aa34383 | 2952 | |
428870ff BB |
2953 | /* |
2954 | * Note: we compare the original data, not the transformed data, | |
2955 | * because when zio->io_bp is an override bp, we will not have | |
2956 | * pushed the I/O transforms. That's an important optimization | |
2957 | * because otherwise we'd compress/encrypt all dmu_sync() data twice. | |
c17bcf83 | 2958 | * However, we should never get a raw, override zio so in these |
b5256303 | 2959 | * cases we can compare the io_abd directly. This is useful because |
c17bcf83 TC |
2960 | * it allows us to do dedup verification even if we don't have access |
2961 | * to the original data (for instance, if the encryption keys aren't | |
2962 | * loaded). | |
428870ff | 2963 | */ |
c17bcf83 | 2964 | |
1c27024e | 2965 | for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { |
428870ff BB |
2966 | zio_t *lio = dde->dde_lead_zio[p]; |
2967 | ||
c17bcf83 TC |
2968 | if (lio != NULL && do_raw) { |
2969 | return (lio->io_size != zio->io_size || | |
a6255b7f | 2970 | abd_cmp(zio->io_abd, lio->io_abd) != 0); |
c17bcf83 | 2971 | } else if (lio != NULL) { |
428870ff | 2972 | return (lio->io_orig_size != zio->io_orig_size || |
a6255b7f | 2973 | abd_cmp(zio->io_orig_abd, lio->io_orig_abd) != 0); |
428870ff BB |
2974 | } |
2975 | } | |
2976 | ||
1c27024e | 2977 | for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { |
428870ff BB |
2978 | ddt_phys_t *ddp = &dde->dde_phys[p]; |
2979 | ||
c17bcf83 TC |
2980 | if (ddp->ddp_phys_birth != 0 && do_raw) { |
2981 | blkptr_t blk = *zio->io_bp; | |
2982 | uint64_t psize; | |
a6255b7f | 2983 | abd_t *tmpabd; |
c17bcf83 TC |
2984 | int error; |
2985 | ||
2986 | ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); | |
2987 | psize = BP_GET_PSIZE(&blk); | |
2988 | ||
2989 | if (psize != zio->io_size) | |
2990 | return (B_TRUE); | |
2991 | ||
2992 | ddt_exit(ddt); | |
2993 | ||
a6255b7f | 2994 | tmpabd = abd_alloc_for_io(psize, B_TRUE); |
c17bcf83 | 2995 | |
a6255b7f | 2996 | error = zio_wait(zio_read(NULL, spa, &blk, tmpabd, |
c17bcf83 TC |
2997 | psize, NULL, NULL, ZIO_PRIORITY_SYNC_READ, |
2998 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | | |
2999 | ZIO_FLAG_RAW, &zio->io_bookmark)); | |
3000 | ||
3001 | if (error == 0) { | |
a6255b7f | 3002 | if (abd_cmp(tmpabd, zio->io_abd) != 0) |
c17bcf83 TC |
3003 | error = SET_ERROR(ENOENT); |
3004 | } | |
3005 | ||
a6255b7f | 3006 | abd_free(tmpabd); |
c17bcf83 TC |
3007 | ddt_enter(ddt); |
3008 | return (error != 0); | |
3009 | } else if (ddp->ddp_phys_birth != 0) { | |
428870ff | 3010 | arc_buf_t *abuf = NULL; |
2a432414 | 3011 | arc_flags_t aflags = ARC_FLAG_WAIT; |
428870ff BB |
3012 | blkptr_t blk = *zio->io_bp; |
3013 | int error; | |
3014 | ||
3015 | ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); | |
3016 | ||
c17bcf83 TC |
3017 | if (BP_GET_LSIZE(&blk) != zio->io_orig_size) |
3018 | return (B_TRUE); | |
3019 | ||
428870ff BB |
3020 | ddt_exit(ddt); |
3021 | ||
294f6806 | 3022 | error = arc_read(NULL, spa, &blk, |
428870ff BB |
3023 | arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, |
3024 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, | |
3025 | &aflags, &zio->io_bookmark); | |
3026 | ||
3027 | if (error == 0) { | |
a6255b7f | 3028 | if (abd_cmp_buf(zio->io_orig_abd, abuf->b_data, |
428870ff | 3029 | zio->io_orig_size) != 0) |
c17bcf83 | 3030 | error = SET_ERROR(ENOENT); |
d3c2ae1c | 3031 | arc_buf_destroy(abuf, &abuf); |
428870ff BB |
3032 | } |
3033 | ||
3034 | ddt_enter(ddt); | |
3035 | return (error != 0); | |
3036 | } | |
3037 | } | |
3038 | ||
3039 | return (B_FALSE); | |
3040 | } | |
3041 | ||
3042 | static void | |
3043 | zio_ddt_child_write_ready(zio_t *zio) | |
3044 | { | |
3045 | int p = zio->io_prop.zp_copies; | |
3046 | ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); | |
3047 | ddt_entry_t *dde = zio->io_private; | |
3048 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
3049 | zio_t *pio; | |
3050 | ||
3051 | if (zio->io_error) | |
3052 | return; | |
3053 | ||
3054 | ddt_enter(ddt); | |
3055 | ||
3056 | ASSERT(dde->dde_lead_zio[p] == zio); | |
3057 | ||
3058 | ddt_phys_fill(ddp, zio->io_bp); | |
3059 | ||
1c27024e | 3060 | zio_link_t *zl = NULL; |
3dfb57a3 | 3061 | while ((pio = zio_walk_parents(zio, &zl)) != NULL) |
428870ff BB |
3062 | ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); |
3063 | ||
3064 | ddt_exit(ddt); | |
3065 | } | |
3066 | ||
3067 | static void | |
3068 | zio_ddt_child_write_done(zio_t *zio) | |
3069 | { | |
3070 | int p = zio->io_prop.zp_copies; | |
3071 | ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); | |
3072 | ddt_entry_t *dde = zio->io_private; | |
3073 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
3074 | ||
3075 | ddt_enter(ddt); | |
3076 | ||
3077 | ASSERT(ddp->ddp_refcnt == 0); | |
3078 | ASSERT(dde->dde_lead_zio[p] == zio); | |
3079 | dde->dde_lead_zio[p] = NULL; | |
3080 | ||
3081 | if (zio->io_error == 0) { | |
3dfb57a3 DB |
3082 | zio_link_t *zl = NULL; |
3083 | while (zio_walk_parents(zio, &zl) != NULL) | |
428870ff BB |
3084 | ddt_phys_addref(ddp); |
3085 | } else { | |
3086 | ddt_phys_clear(ddp); | |
3087 | } | |
3088 | ||
3089 | ddt_exit(ddt); | |
3090 | } | |
3091 | ||
3092 | static void | |
3093 | zio_ddt_ditto_write_done(zio_t *zio) | |
3094 | { | |
3095 | int p = DDT_PHYS_DITTO; | |
1c27024e | 3096 | ASSERTV(zio_prop_t *zp = &zio->io_prop); |
428870ff BB |
3097 | blkptr_t *bp = zio->io_bp; |
3098 | ddt_t *ddt = ddt_select(zio->io_spa, bp); | |
3099 | ddt_entry_t *dde = zio->io_private; | |
3100 | ddt_phys_t *ddp = &dde->dde_phys[p]; | |
3101 | ddt_key_t *ddk = &dde->dde_key; | |
3102 | ||
3103 | ddt_enter(ddt); | |
3104 | ||
3105 | ASSERT(ddp->ddp_refcnt == 0); | |
3106 | ASSERT(dde->dde_lead_zio[p] == zio); | |
3107 | dde->dde_lead_zio[p] = NULL; | |
3108 | ||
3109 | if (zio->io_error == 0) { | |
3110 | ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); | |
3111 | ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); | |
3112 | ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); | |
3113 | if (ddp->ddp_phys_birth != 0) | |
3114 | ddt_phys_free(ddt, ddk, ddp, zio->io_txg); | |
3115 | ddt_phys_fill(ddp, bp); | |
3116 | } | |
3117 | ||
3118 | ddt_exit(ddt); | |
3119 | } | |
3120 | ||
62840030 | 3121 | static zio_t * |
428870ff BB |
3122 | zio_ddt_write(zio_t *zio) |
3123 | { | |
3124 | spa_t *spa = zio->io_spa; | |
3125 | blkptr_t *bp = zio->io_bp; | |
3126 | uint64_t txg = zio->io_txg; | |
3127 | zio_prop_t *zp = &zio->io_prop; | |
3128 | int p = zp->zp_copies; | |
3129 | int ditto_copies; | |
3130 | zio_t *cio = NULL; | |
3131 | zio_t *dio = NULL; | |
3132 | ddt_t *ddt = ddt_select(spa, bp); | |
3133 | ddt_entry_t *dde; | |
3134 | ddt_phys_t *ddp; | |
3135 | ||
3136 | ASSERT(BP_GET_DEDUP(bp)); | |
3137 | ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); | |
3138 | ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); | |
c17bcf83 | 3139 | ASSERT(!(zio->io_bp_override && (zio->io_flags & ZIO_FLAG_RAW))); |
428870ff BB |
3140 | |
3141 | ddt_enter(ddt); | |
3142 | dde = ddt_lookup(ddt, bp, B_TRUE); | |
3143 | ddp = &dde->dde_phys[p]; | |
3144 | ||
3145 | if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { | |
3146 | /* | |
3147 | * If we're using a weak checksum, upgrade to a strong checksum | |
3148 | * and try again. If we're already using a strong checksum, | |
3149 | * we can't resolve it, so just convert to an ordinary write. | |
3150 | * (And automatically e-mail a paper to Nature?) | |
3151 | */ | |
3c67d83a TH |
3152 | if (!(zio_checksum_table[zp->zp_checksum].ci_flags & |
3153 | ZCHECKSUM_FLAG_DEDUP)) { | |
428870ff BB |
3154 | zp->zp_checksum = spa_dedup_checksum(spa); |
3155 | zio_pop_transforms(zio); | |
3156 | zio->io_stage = ZIO_STAGE_OPEN; | |
3157 | BP_ZERO(bp); | |
3158 | } else { | |
03c6040b | 3159 | zp->zp_dedup = B_FALSE; |
428870ff BB |
3160 | } |
3161 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
3162 | ddt_exit(ddt); | |
62840030 | 3163 | return (zio); |
428870ff BB |
3164 | } |
3165 | ||
3166 | ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); | |
3167 | ASSERT(ditto_copies < SPA_DVAS_PER_BP); | |
3168 | ||
3169 | if (ditto_copies > ddt_ditto_copies_present(dde) && | |
3170 | dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { | |
3171 | zio_prop_t czp = *zp; | |
3172 | ||
3173 | czp.zp_copies = ditto_copies; | |
3174 | ||
3175 | /* | |
3176 | * If we arrived here with an override bp, we won't have run | |
3177 | * the transform stack, so we won't have the data we need to | |
3178 | * generate a child i/o. So, toss the override bp and restart. | |
3179 | * This is safe, because using the override bp is just an | |
3180 | * optimization; and it's rare, so the cost doesn't matter. | |
3181 | */ | |
3182 | if (zio->io_bp_override) { | |
3183 | zio_pop_transforms(zio); | |
3184 | zio->io_stage = ZIO_STAGE_OPEN; | |
3185 | zio->io_pipeline = ZIO_WRITE_PIPELINE; | |
3186 | zio->io_bp_override = NULL; | |
3187 | BP_ZERO(bp); | |
3188 | ddt_exit(ddt); | |
62840030 | 3189 | return (zio); |
428870ff BB |
3190 | } |
3191 | ||
a6255b7f | 3192 | dio = zio_write(zio, spa, txg, bp, zio->io_orig_abd, |
2aa34383 | 3193 | zio->io_orig_size, zio->io_orig_size, &czp, NULL, NULL, |
bc77ba73 | 3194 | NULL, zio_ddt_ditto_write_done, dde, zio->io_priority, |
428870ff BB |
3195 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); |
3196 | ||
a6255b7f | 3197 | zio_push_transform(dio, zio->io_abd, zio->io_size, 0, NULL); |
428870ff BB |
3198 | dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; |
3199 | } | |
3200 | ||
3201 | if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { | |
3202 | if (ddp->ddp_phys_birth != 0) | |
3203 | ddt_bp_fill(ddp, bp, txg); | |
3204 | if (dde->dde_lead_zio[p] != NULL) | |
3205 | zio_add_child(zio, dde->dde_lead_zio[p]); | |
3206 | else | |
3207 | ddt_phys_addref(ddp); | |
3208 | } else if (zio->io_bp_override) { | |
3209 | ASSERT(bp->blk_birth == txg); | |
3210 | ASSERT(BP_EQUAL(bp, zio->io_bp_override)); | |
3211 | ddt_phys_fill(ddp, bp); | |
3212 | ddt_phys_addref(ddp); | |
3213 | } else { | |
a6255b7f | 3214 | cio = zio_write(zio, spa, txg, bp, zio->io_orig_abd, |
2aa34383 | 3215 | zio->io_orig_size, zio->io_orig_size, zp, |
bc77ba73 | 3216 | zio_ddt_child_write_ready, NULL, NULL, |
428870ff BB |
3217 | zio_ddt_child_write_done, dde, zio->io_priority, |
3218 | ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); | |
3219 | ||
a6255b7f | 3220 | zio_push_transform(cio, zio->io_abd, zio->io_size, 0, NULL); |
428870ff BB |
3221 | dde->dde_lead_zio[p] = cio; |
3222 | } | |
3223 | ||
3224 | ddt_exit(ddt); | |
3225 | ||
3226 | if (cio) | |
3227 | zio_nowait(cio); | |
3228 | if (dio) | |
3229 | zio_nowait(dio); | |
3230 | ||
62840030 | 3231 | return (zio); |
428870ff BB |
3232 | } |
3233 | ||
3234 | ddt_entry_t *freedde; /* for debugging */ | |
b128c09f | 3235 | |
62840030 | 3236 | static zio_t * |
428870ff BB |
3237 | zio_ddt_free(zio_t *zio) |
3238 | { | |
3239 | spa_t *spa = zio->io_spa; | |
3240 | blkptr_t *bp = zio->io_bp; | |
3241 | ddt_t *ddt = ddt_select(spa, bp); | |
3242 | ddt_entry_t *dde; | |
3243 | ddt_phys_t *ddp; | |
3244 | ||
3245 | ASSERT(BP_GET_DEDUP(bp)); | |
3246 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
3247 | ||
3248 | ddt_enter(ddt); | |
3249 | freedde = dde = ddt_lookup(ddt, bp, B_TRUE); | |
5dc6af0e BB |
3250 | if (dde) { |
3251 | ddp = ddt_phys_select(dde, bp); | |
3252 | if (ddp) | |
3253 | ddt_phys_decref(ddp); | |
3254 | } | |
428870ff BB |
3255 | ddt_exit(ddt); |
3256 | ||
62840030 | 3257 | return (zio); |
428870ff BB |
3258 | } |
3259 | ||
3260 | /* | |
3261 | * ========================================================================== | |
3262 | * Allocate and free blocks | |
3263 | * ========================================================================== | |
3264 | */ | |
3dfb57a3 DB |
3265 | |
3266 | static zio_t * | |
492f64e9 | 3267 | zio_io_to_allocate(spa_t *spa, int allocator) |
3dfb57a3 DB |
3268 | { |
3269 | zio_t *zio; | |
3270 | ||
492f64e9 | 3271 | ASSERT(MUTEX_HELD(&spa->spa_alloc_locks[allocator])); |
3dfb57a3 | 3272 | |
492f64e9 | 3273 | zio = avl_first(&spa->spa_alloc_trees[allocator]); |
3dfb57a3 DB |
3274 | if (zio == NULL) |
3275 | return (NULL); | |
3276 | ||
3277 | ASSERT(IO_IS_ALLOCATING(zio)); | |
3278 | ||
3279 | /* | |
3280 | * Try to place a reservation for this zio. If we're unable to | |
3281 | * reserve then we throttle. | |
3282 | */ | |
492f64e9 | 3283 | ASSERT3U(zio->io_allocator, ==, allocator); |
cc99f275 | 3284 | if (!metaslab_class_throttle_reserve(zio->io_metaslab_class, |
492f64e9 | 3285 | zio->io_prop.zp_copies, zio->io_allocator, zio, 0)) { |
3dfb57a3 DB |
3286 | return (NULL); |
3287 | } | |
3288 | ||
492f64e9 | 3289 | avl_remove(&spa->spa_alloc_trees[allocator], zio); |
3dfb57a3 DB |
3290 | ASSERT3U(zio->io_stage, <, ZIO_STAGE_DVA_ALLOCATE); |
3291 | ||
3292 | return (zio); | |
3293 | } | |
3294 | ||
62840030 | 3295 | static zio_t * |
3dfb57a3 DB |
3296 | zio_dva_throttle(zio_t *zio) |
3297 | { | |
3298 | spa_t *spa = zio->io_spa; | |
3299 | zio_t *nio; | |
cc99f275 DB |
3300 | metaslab_class_t *mc; |
3301 | ||
3302 | /* locate an appropriate allocation class */ | |
3303 | mc = spa_preferred_class(spa, zio->io_size, zio->io_prop.zp_type, | |
3304 | zio->io_prop.zp_level, zio->io_prop.zp_zpl_smallblk); | |
3dfb57a3 DB |
3305 | |
3306 | if (zio->io_priority == ZIO_PRIORITY_SYNC_WRITE || | |
cc99f275 | 3307 | !mc->mc_alloc_throttle_enabled || |
3dfb57a3 DB |
3308 | zio->io_child_type == ZIO_CHILD_GANG || |
3309 | zio->io_flags & ZIO_FLAG_NODATA) { | |
62840030 | 3310 | return (zio); |
3dfb57a3 DB |
3311 | } |
3312 | ||
3313 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
3314 | ||
3315 | ASSERT3U(zio->io_queued_timestamp, >, 0); | |
3316 | ASSERT(zio->io_stage == ZIO_STAGE_DVA_THROTTLE); | |
3317 | ||
492f64e9 PD |
3318 | zbookmark_phys_t *bm = &zio->io_bookmark; |
3319 | /* | |
3320 | * We want to try to use as many allocators as possible to help improve | |
3321 | * performance, but we also want logically adjacent IOs to be physically | |
3322 | * adjacent to improve sequential read performance. We chunk each object | |
3323 | * into 2^20 block regions, and then hash based on the objset, object, | |
3324 | * level, and region to accomplish both of these goals. | |
3325 | */ | |
3326 | zio->io_allocator = cityhash4(bm->zb_objset, bm->zb_object, | |
3327 | bm->zb_level, bm->zb_blkid >> 20) % spa->spa_alloc_count; | |
3328 | mutex_enter(&spa->spa_alloc_locks[zio->io_allocator]); | |
3dfb57a3 | 3329 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); |
cc99f275 | 3330 | zio->io_metaslab_class = mc; |
492f64e9 | 3331 | avl_add(&spa->spa_alloc_trees[zio->io_allocator], zio); |
cc99f275 | 3332 | nio = zio_io_to_allocate(spa, zio->io_allocator); |
492f64e9 | 3333 | mutex_exit(&spa->spa_alloc_locks[zio->io_allocator]); |
62840030 | 3334 | return (nio); |
3dfb57a3 DB |
3335 | } |
3336 | ||
cc99f275 | 3337 | static void |
492f64e9 | 3338 | zio_allocate_dispatch(spa_t *spa, int allocator) |
3dfb57a3 DB |
3339 | { |
3340 | zio_t *zio; | |
3341 | ||
492f64e9 PD |
3342 | mutex_enter(&spa->spa_alloc_locks[allocator]); |
3343 | zio = zio_io_to_allocate(spa, allocator); | |
3344 | mutex_exit(&spa->spa_alloc_locks[allocator]); | |
3dfb57a3 DB |
3345 | if (zio == NULL) |
3346 | return; | |
3347 | ||
3348 | ASSERT3U(zio->io_stage, ==, ZIO_STAGE_DVA_THROTTLE); | |
3349 | ASSERT0(zio->io_error); | |
3350 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_TRUE); | |
3351 | } | |
3352 | ||
62840030 | 3353 | static zio_t * |
34dc7c2f BB |
3354 | zio_dva_allocate(zio_t *zio) |
3355 | { | |
3356 | spa_t *spa = zio->io_spa; | |
cc99f275 | 3357 | metaslab_class_t *mc; |
34dc7c2f BB |
3358 | blkptr_t *bp = zio->io_bp; |
3359 | int error; | |
6d974228 | 3360 | int flags = 0; |
34dc7c2f | 3361 | |
9babb374 BB |
3362 | if (zio->io_gang_leader == NULL) { |
3363 | ASSERT(zio->io_child_type > ZIO_CHILD_GANG); | |
3364 | zio->io_gang_leader = zio; | |
3365 | } | |
3366 | ||
34dc7c2f | 3367 | ASSERT(BP_IS_HOLE(bp)); |
c99c9001 | 3368 | ASSERT0(BP_GET_NDVAS(bp)); |
428870ff BB |
3369 | ASSERT3U(zio->io_prop.zp_copies, >, 0); |
3370 | ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); | |
34dc7c2f BB |
3371 | ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); |
3372 | ||
920dd524 | 3373 | flags |= (zio->io_flags & ZIO_FLAG_FASTWRITE) ? METASLAB_FASTWRITE : 0; |
3dfb57a3 DB |
3374 | if (zio->io_flags & ZIO_FLAG_NODATA) |
3375 | flags |= METASLAB_DONT_THROTTLE; | |
3376 | if (zio->io_flags & ZIO_FLAG_GANG_CHILD) | |
3377 | flags |= METASLAB_GANG_CHILD; | |
3378 | if (zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE) | |
3379 | flags |= METASLAB_ASYNC_ALLOC; | |
3380 | ||
cc99f275 DB |
3381 | /* |
3382 | * if not already chosen, locate an appropriate allocation class | |
3383 | */ | |
3384 | mc = zio->io_metaslab_class; | |
3385 | if (mc == NULL) { | |
3386 | mc = spa_preferred_class(spa, zio->io_size, | |
3387 | zio->io_prop.zp_type, zio->io_prop.zp_level, | |
3388 | zio->io_prop.zp_zpl_smallblk); | |
3389 | zio->io_metaslab_class = mc; | |
3390 | } | |
3391 | ||
b128c09f | 3392 | error = metaslab_alloc(spa, mc, zio->io_size, bp, |
4e21fd06 | 3393 | zio->io_prop.zp_copies, zio->io_txg, NULL, flags, |
492f64e9 | 3394 | &zio->io_alloc_list, zio, zio->io_allocator); |
34dc7c2f | 3395 | |
cc99f275 DB |
3396 | /* |
3397 | * Fallback to normal class when an alloc class is full | |
3398 | */ | |
3399 | if (error == ENOSPC && mc != spa_normal_class(spa)) { | |
3400 | /* | |
3401 | * If throttling, transfer reservation over to normal class. | |
3402 | * The io_allocator slot can remain the same even though we | |
3403 | * are switching classes. | |
3404 | */ | |
3405 | if (mc->mc_alloc_throttle_enabled && | |
3406 | (zio->io_flags & ZIO_FLAG_IO_ALLOCATING)) { | |
3407 | metaslab_class_throttle_unreserve(mc, | |
3408 | zio->io_prop.zp_copies, zio->io_allocator, zio); | |
3409 | zio->io_flags &= ~ZIO_FLAG_IO_ALLOCATING; | |
3410 | ||
3411 | mc = spa_normal_class(spa); | |
3412 | VERIFY(metaslab_class_throttle_reserve(mc, | |
3413 | zio->io_prop.zp_copies, zio->io_allocator, zio, | |
3414 | flags | METASLAB_MUST_RESERVE)); | |
3415 | } else { | |
3416 | mc = spa_normal_class(spa); | |
3417 | } | |
3418 | zio->io_metaslab_class = mc; | |
3419 | ||
3420 | error = metaslab_alloc(spa, mc, zio->io_size, bp, | |
3421 | zio->io_prop.zp_copies, zio->io_txg, NULL, flags, | |
3422 | &zio->io_alloc_list, zio, zio->io_allocator); | |
3423 | } | |
3424 | ||
3dfb57a3 | 3425 | if (error != 0) { |
964c2d69 | 3426 | zfs_dbgmsg("%s: metaslab allocation failure: zio %p, " |
6d974228 GW |
3427 | "size %llu, error %d", spa_name(spa), zio, zio->io_size, |
3428 | error); | |
b128c09f BB |
3429 | if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) |
3430 | return (zio_write_gang_block(zio)); | |
34dc7c2f BB |
3431 | zio->io_error = error; |
3432 | } | |
3433 | ||
62840030 | 3434 | return (zio); |
34dc7c2f BB |
3435 | } |
3436 | ||
62840030 | 3437 | static zio_t * |
34dc7c2f BB |
3438 | zio_dva_free(zio_t *zio) |
3439 | { | |
b128c09f | 3440 | metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); |
34dc7c2f | 3441 | |
62840030 | 3442 | return (zio); |
34dc7c2f BB |
3443 | } |
3444 | ||
62840030 | 3445 | static zio_t * |
34dc7c2f BB |
3446 | zio_dva_claim(zio_t *zio) |
3447 | { | |
b128c09f BB |
3448 | int error; |
3449 | ||
3450 | error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); | |
3451 | if (error) | |
3452 | zio->io_error = error; | |
34dc7c2f | 3453 | |
62840030 | 3454 | return (zio); |
34dc7c2f BB |
3455 | } |
3456 | ||
b128c09f BB |
3457 | /* |
3458 | * Undo an allocation. This is used by zio_done() when an I/O fails | |
3459 | * and we want to give back the block we just allocated. | |
3460 | * This handles both normal blocks and gang blocks. | |
3461 | */ | |
3462 | static void | |
3463 | zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) | |
3464 | { | |
b128c09f | 3465 | ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); |
428870ff | 3466 | ASSERT(zio->io_bp_override == NULL); |
b128c09f BB |
3467 | |
3468 | if (!BP_IS_HOLE(bp)) | |
428870ff | 3469 | metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); |
b128c09f BB |
3470 | |
3471 | if (gn != NULL) { | |
1c27024e | 3472 | for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { |
b128c09f BB |
3473 | zio_dva_unallocate(zio, gn->gn_child[g], |
3474 | &gn->gn_gbh->zg_blkptr[g]); | |
3475 | } | |
3476 | } | |
3477 | } | |
3478 | ||
3479 | /* | |
3480 | * Try to allocate an intent log block. Return 0 on success, errno on failure. | |
3481 | */ | |
3482 | int | |
b5256303 TC |
3483 | zio_alloc_zil(spa_t *spa, objset_t *os, uint64_t txg, blkptr_t *new_bp, |
3484 | uint64_t size, boolean_t *slog) | |
b128c09f | 3485 | { |
428870ff | 3486 | int error = 1; |
4e21fd06 | 3487 | zio_alloc_list_t io_alloc_list; |
b128c09f | 3488 | |
428870ff BB |
3489 | ASSERT(txg > spa_syncing_txg(spa)); |
3490 | ||
4e21fd06 | 3491 | metaslab_trace_init(&io_alloc_list); |
cc99f275 DB |
3492 | |
3493 | /* | |
3494 | * Block pointer fields are useful to metaslabs for stats and debugging. | |
3495 | * Fill in the obvious ones before calling into metaslab_alloc(). | |
3496 | */ | |
3497 | BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); | |
3498 | BP_SET_PSIZE(new_bp, size); | |
3499 | BP_SET_LEVEL(new_bp, 0); | |
3500 | ||
492f64e9 PD |
3501 | /* |
3502 | * When allocating a zil block, we don't have information about | |
3503 | * the final destination of the block except the objset it's part | |
3504 | * of, so we just hash the objset ID to pick the allocator to get | |
3505 | * some parallelism. | |
3506 | */ | |
1b7c1e5c | 3507 | error = metaslab_alloc(spa, spa_log_class(spa), size, new_bp, 1, |
492f64e9 PD |
3508 | txg, NULL, METASLAB_FASTWRITE, &io_alloc_list, NULL, |
3509 | cityhash4(0, 0, 0, os->os_dsl_dataset->ds_object) % | |
3510 | spa->spa_alloc_count); | |
1b7c1e5c GDN |
3511 | if (error == 0) { |
3512 | *slog = TRUE; | |
3513 | } else { | |
428870ff | 3514 | error = metaslab_alloc(spa, spa_normal_class(spa), size, |
4e21fd06 | 3515 | new_bp, 1, txg, NULL, METASLAB_FASTWRITE, |
492f64e9 PD |
3516 | &io_alloc_list, NULL, cityhash4(0, 0, 0, |
3517 | os->os_dsl_dataset->ds_object) % spa->spa_alloc_count); | |
1b7c1e5c GDN |
3518 | if (error == 0) |
3519 | *slog = FALSE; | |
ebf8e3a2 | 3520 | } |
4e21fd06 | 3521 | metaslab_trace_fini(&io_alloc_list); |
b128c09f BB |
3522 | |
3523 | if (error == 0) { | |
3524 | BP_SET_LSIZE(new_bp, size); | |
3525 | BP_SET_PSIZE(new_bp, size); | |
3526 | BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); | |
428870ff BB |
3527 | BP_SET_CHECKSUM(new_bp, |
3528 | spa_version(spa) >= SPA_VERSION_SLIM_ZIL | |
3529 | ? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG); | |
b128c09f BB |
3530 | BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); |
3531 | BP_SET_LEVEL(new_bp, 0); | |
428870ff | 3532 | BP_SET_DEDUP(new_bp, 0); |
b128c09f | 3533 | BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); |
b5256303 TC |
3534 | |
3535 | /* | |
3536 | * encrypted blocks will require an IV and salt. We generate | |
3537 | * these now since we will not be rewriting the bp at | |
3538 | * rewrite time. | |
3539 | */ | |
3540 | if (os->os_encrypted) { | |
3541 | uint8_t iv[ZIO_DATA_IV_LEN]; | |
3542 | uint8_t salt[ZIO_DATA_SALT_LEN]; | |
3543 | ||
3544 | BP_SET_CRYPT(new_bp, B_TRUE); | |
3545 | VERIFY0(spa_crypt_get_salt(spa, | |
3546 | dmu_objset_id(os), salt)); | |
3547 | VERIFY0(zio_crypt_generate_iv(iv)); | |
3548 | ||
3549 | zio_crypt_encode_params_bp(new_bp, salt, iv); | |
3550 | } | |
1ce23dca PS |
3551 | } else { |
3552 | zfs_dbgmsg("%s: zil block allocation failure: " | |
3553 | "size %llu, error %d", spa_name(spa), size, error); | |
b128c09f BB |
3554 | } |
3555 | ||
3556 | return (error); | |
3557 | } | |
3558 | ||
34dc7c2f BB |
3559 | /* |
3560 | * ========================================================================== | |
3561 | * Read and write to physical devices | |
3562 | * ========================================================================== | |
3563 | */ | |
98b25418 GW |
3564 | |
3565 | ||
3566 | /* | |
3567 | * Issue an I/O to the underlying vdev. Typically the issue pipeline | |
3568 | * stops after this stage and will resume upon I/O completion. | |
3569 | * However, there are instances where the vdev layer may need to | |
3570 | * continue the pipeline when an I/O was not issued. Since the I/O | |
3571 | * that was sent to the vdev layer might be different than the one | |
3572 | * currently active in the pipeline (see vdev_queue_io()), we explicitly | |
3573 | * force the underlying vdev layers to call either zio_execute() or | |
3574 | * zio_interrupt() to ensure that the pipeline continues with the correct I/O. | |
3575 | */ | |
62840030 | 3576 | static zio_t * |
34dc7c2f BB |
3577 | zio_vdev_io_start(zio_t *zio) |
3578 | { | |
3579 | vdev_t *vd = zio->io_vd; | |
34dc7c2f BB |
3580 | uint64_t align; |
3581 | spa_t *spa = zio->io_spa; | |
3582 | ||
193a37cb TH |
3583 | zio->io_delay = 0; |
3584 | ||
b128c09f BB |
3585 | ASSERT(zio->io_error == 0); |
3586 | ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); | |
34dc7c2f | 3587 | |
b128c09f BB |
3588 | if (vd == NULL) { |
3589 | if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) | |
3590 | spa_config_enter(spa, SCL_ZIO, zio, RW_READER); | |
34dc7c2f | 3591 | |
b128c09f BB |
3592 | /* |
3593 | * The mirror_ops handle multiple DVAs in a single BP. | |
3594 | */ | |
98b25418 | 3595 | vdev_mirror_ops.vdev_op_io_start(zio); |
62840030 | 3596 | return (NULL); |
34dc7c2f BB |
3597 | } |
3598 | ||
3dfb57a3 | 3599 | ASSERT3P(zio->io_logical, !=, zio); |
6cb8e530 PZ |
3600 | if (zio->io_type == ZIO_TYPE_WRITE) { |
3601 | ASSERT(spa->spa_trust_config); | |
3602 | ||
a1d477c2 MA |
3603 | /* |
3604 | * Note: the code can handle other kinds of writes, | |
3605 | * but we don't expect them. | |
3606 | */ | |
6cb8e530 PZ |
3607 | if (zio->io_vd->vdev_removing) { |
3608 | ASSERT(zio->io_flags & | |
3609 | (ZIO_FLAG_PHYSICAL | ZIO_FLAG_SELF_HEAL | | |
3610 | ZIO_FLAG_RESILVER | ZIO_FLAG_INDUCE_DAMAGE)); | |
3611 | } | |
a1d477c2 | 3612 | } |
3dfb57a3 | 3613 | |
b128c09f BB |
3614 | align = 1ULL << vd->vdev_top->vdev_ashift; |
3615 | ||
b02fe35d AR |
3616 | if (!(zio->io_flags & ZIO_FLAG_PHYSICAL) && |
3617 | P2PHASE(zio->io_size, align) != 0) { | |
3618 | /* Transform logical writes to be a full physical block size. */ | |
34dc7c2f | 3619 | uint64_t asize = P2ROUNDUP(zio->io_size, align); |
a6255b7f | 3620 | abd_t *abuf = abd_alloc_sametype(zio->io_abd, asize); |
178e73b3 | 3621 | ASSERT(vd == vd->vdev_top); |
34dc7c2f | 3622 | if (zio->io_type == ZIO_TYPE_WRITE) { |
a6255b7f DQ |
3623 | abd_copy(abuf, zio->io_abd, zio->io_size); |
3624 | abd_zero_off(abuf, zio->io_size, asize - zio->io_size); | |
34dc7c2f | 3625 | } |
b128c09f | 3626 | zio_push_transform(zio, abuf, asize, asize, zio_subblock); |
34dc7c2f BB |
3627 | } |
3628 | ||
b02fe35d AR |
3629 | /* |
3630 | * If this is not a physical io, make sure that it is properly aligned | |
3631 | * before proceeding. | |
3632 | */ | |
3633 | if (!(zio->io_flags & ZIO_FLAG_PHYSICAL)) { | |
3634 | ASSERT0(P2PHASE(zio->io_offset, align)); | |
3635 | ASSERT0(P2PHASE(zio->io_size, align)); | |
3636 | } else { | |
3637 | /* | |
3638 | * For physical writes, we allow 512b aligned writes and assume | |
3639 | * the device will perform a read-modify-write as necessary. | |
3640 | */ | |
3641 | ASSERT0(P2PHASE(zio->io_offset, SPA_MINBLOCKSIZE)); | |
3642 | ASSERT0(P2PHASE(zio->io_size, SPA_MINBLOCKSIZE)); | |
3643 | } | |
3644 | ||
572e2857 | 3645 | VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); |
fb5f0bc8 BB |
3646 | |
3647 | /* | |
3648 | * If this is a repair I/O, and there's no self-healing involved -- | |
3649 | * that is, we're just resilvering what we expect to resilver -- | |
3650 | * then don't do the I/O unless zio's txg is actually in vd's DTL. | |
9e052db4 MA |
3651 | * This prevents spurious resilvering. |
3652 | * | |
3653 | * There are a few ways that we can end up creating these spurious | |
3654 | * resilver i/os: | |
3655 | * | |
3656 | * 1. A resilver i/o will be issued if any DVA in the BP has a | |
3657 | * dirty DTL. The mirror code will issue resilver writes to | |
3658 | * each DVA, including the one(s) that are not on vdevs with dirty | |
3659 | * DTLs. | |
3660 | * | |
3661 | * 2. With nested replication, which happens when we have a | |
3662 | * "replacing" or "spare" vdev that's a child of a mirror or raidz. | |
3663 | * For example, given mirror(replacing(A+B), C), it's likely that | |
3664 | * only A is out of date (it's the new device). In this case, we'll | |
3665 | * read from C, then use the data to resilver A+B -- but we don't | |
3666 | * actually want to resilver B, just A. The top-level mirror has no | |
3667 | * way to know this, so instead we just discard unnecessary repairs | |
3668 | * as we work our way down the vdev tree. | |
3669 | * | |
3670 | * 3. ZTEST also creates mirrors of mirrors, mirrors of raidz, etc. | |
3671 | * The same logic applies to any form of nested replication: ditto | |
3672 | * + mirror, RAID-Z + replacing, etc. | |
3673 | * | |
3674 | * However, indirect vdevs point off to other vdevs which may have | |
3675 | * DTL's, so we never bypass them. The child i/os on concrete vdevs | |
3676 | * will be properly bypassed instead. | |
fb5f0bc8 BB |
3677 | */ |
3678 | if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && | |
3679 | !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && | |
3680 | zio->io_txg != 0 && /* not a delegated i/o */ | |
9e052db4 | 3681 | vd->vdev_ops != &vdev_indirect_ops && |
fb5f0bc8 BB |
3682 | !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { |
3683 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); | |
fb5f0bc8 | 3684 | zio_vdev_io_bypass(zio); |
62840030 | 3685 | return (zio); |
fb5f0bc8 | 3686 | } |
34dc7c2f | 3687 | |
b128c09f BB |
3688 | if (vd->vdev_ops->vdev_op_leaf && |
3689 | (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { | |
3690 | ||
b0bc7a84 | 3691 | if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio)) |
62840030 | 3692 | return (zio); |
b128c09f BB |
3693 | |
3694 | if ((zio = vdev_queue_io(zio)) == NULL) | |
62840030 | 3695 | return (NULL); |
b128c09f BB |
3696 | |
3697 | if (!vdev_accessible(vd, zio)) { | |
2e528b49 | 3698 | zio->io_error = SET_ERROR(ENXIO); |
b128c09f | 3699 | zio_interrupt(zio); |
62840030 | 3700 | return (NULL); |
b128c09f | 3701 | } |
67103816 | 3702 | zio->io_delay = gethrtime(); |
b128c09f BB |
3703 | } |
3704 | ||
98b25418 | 3705 | vd->vdev_ops->vdev_op_io_start(zio); |
62840030 | 3706 | return (NULL); |
34dc7c2f BB |
3707 | } |
3708 | ||
62840030 | 3709 | static zio_t * |
34dc7c2f BB |
3710 | zio_vdev_io_done(zio_t *zio) |
3711 | { | |
b128c09f BB |
3712 | vdev_t *vd = zio->io_vd; |
3713 | vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; | |
3714 | boolean_t unexpected_error = B_FALSE; | |
34dc7c2f | 3715 | |
ddc751d5 | 3716 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV_BIT, ZIO_WAIT_DONE)) { |
62840030 | 3717 | return (NULL); |
ddc751d5 | 3718 | } |
34dc7c2f | 3719 | |
b128c09f BB |
3720 | ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); |
3721 | ||
193a37cb TH |
3722 | if (zio->io_delay) |
3723 | zio->io_delay = gethrtime() - zio->io_delay; | |
3724 | ||
b128c09f BB |
3725 | if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { |
3726 | ||
3727 | vdev_queue_io_done(zio); | |
3728 | ||
3729 | if (zio->io_type == ZIO_TYPE_WRITE) | |
3730 | vdev_cache_write(zio); | |
3731 | ||
3732 | if (zio_injection_enabled && zio->io_error == 0) | |
d977122d DB |
3733 | zio->io_error = zio_handle_device_injections(vd, zio, |
3734 | EIO, EILSEQ); | |
b128c09f BB |
3735 | |
3736 | if (zio_injection_enabled && zio->io_error == 0) | |
3737 | zio->io_error = zio_handle_label_injection(zio, EIO); | |
3738 | ||
3739 | if (zio->io_error) { | |
3740 | if (!vdev_accessible(vd, zio)) { | |
2e528b49 | 3741 | zio->io_error = SET_ERROR(ENXIO); |
b128c09f BB |
3742 | } else { |
3743 | unexpected_error = B_TRUE; | |
3744 | } | |
3745 | } | |
3746 | } | |
3747 | ||
3748 | ops->vdev_op_io_done(zio); | |
34dc7c2f | 3749 | |
f43615d0 | 3750 | if (unexpected_error) |
d164b209 | 3751 | VERIFY(vdev_probe(vd, zio) == NULL); |
34dc7c2f | 3752 | |
62840030 | 3753 | return (zio); |
34dc7c2f BB |
3754 | } |
3755 | ||
a8b2e306 TC |
3756 | /* |
3757 | * This function is used to change the priority of an existing zio that is | |
3758 | * currently in-flight. This is used by the arc to upgrade priority in the | |
3759 | * event that a demand read is made for a block that is currently queued | |
3760 | * as a scrub or async read IO. Otherwise, the high priority read request | |
3761 | * would end up having to wait for the lower priority IO. | |
3762 | */ | |
3763 | void | |
3764 | zio_change_priority(zio_t *pio, zio_priority_t priority) | |
3765 | { | |
3766 | zio_t *cio, *cio_next; | |
3767 | zio_link_t *zl = NULL; | |
3768 | ||
3769 | ASSERT3U(priority, <, ZIO_PRIORITY_NUM_QUEUEABLE); | |
3770 | ||
3771 | if (pio->io_vd != NULL && pio->io_vd->vdev_ops->vdev_op_leaf) { | |
3772 | vdev_queue_change_io_priority(pio, priority); | |
3773 | } else { | |
3774 | pio->io_priority = priority; | |
3775 | } | |
3776 | ||
3777 | mutex_enter(&pio->io_lock); | |
3778 | for (cio = zio_walk_children(pio, &zl); cio != NULL; cio = cio_next) { | |
3779 | cio_next = zio_walk_children(pio, &zl); | |
3780 | zio_change_priority(cio, priority); | |
3781 | } | |
3782 | mutex_exit(&pio->io_lock); | |
3783 | } | |
3784 | ||
428870ff BB |
3785 | /* |
3786 | * For non-raidz ZIOs, we can just copy aside the bad data read from the | |
3787 | * disk, and use that to finish the checksum ereport later. | |
3788 | */ | |
3789 | static void | |
3790 | zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, | |
84c07ada | 3791 | const abd_t *good_buf) |
428870ff BB |
3792 | { |
3793 | /* no processing needed */ | |
3794 | zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); | |
3795 | } | |
3796 | ||
3797 | /*ARGSUSED*/ | |
3798 | void | |
3799 | zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) | |
3800 | { | |
84c07ada | 3801 | void *abd = abd_alloc_sametype(zio->io_abd, zio->io_size); |
428870ff | 3802 | |
84c07ada | 3803 | abd_copy(abd, zio->io_abd, zio->io_size); |
428870ff BB |
3804 | |
3805 | zcr->zcr_cbinfo = zio->io_size; | |
84c07ada | 3806 | zcr->zcr_cbdata = abd; |
428870ff | 3807 | zcr->zcr_finish = zio_vsd_default_cksum_finish; |
84c07ada | 3808 | zcr->zcr_free = zio_abd_free; |
428870ff BB |
3809 | } |
3810 | ||
62840030 | 3811 | static zio_t * |
34dc7c2f BB |
3812 | zio_vdev_io_assess(zio_t *zio) |
3813 | { | |
3814 | vdev_t *vd = zio->io_vd; | |
b128c09f | 3815 | |
ddc751d5 | 3816 | if (zio_wait_for_children(zio, ZIO_CHILD_VDEV_BIT, ZIO_WAIT_DONE)) { |
62840030 | 3817 | return (NULL); |
ddc751d5 | 3818 | } |
b128c09f BB |
3819 | |
3820 | if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) | |
3821 | spa_config_exit(zio->io_spa, SCL_ZIO, zio); | |
3822 | ||
3823 | if (zio->io_vsd != NULL) { | |
428870ff | 3824 | zio->io_vsd_ops->vsd_free(zio); |
b128c09f | 3825 | zio->io_vsd = NULL; |
34dc7c2f BB |
3826 | } |
3827 | ||
b128c09f | 3828 | if (zio_injection_enabled && zio->io_error == 0) |
34dc7c2f BB |
3829 | zio->io_error = zio_handle_fault_injection(zio, EIO); |
3830 | ||
3831 | /* | |
3832 | * If the I/O failed, determine whether we should attempt to retry it. | |
428870ff BB |
3833 | * |
3834 | * On retry, we cut in line in the issue queue, since we don't want | |
3835 | * compression/checksumming/etc. work to prevent our (cheap) IO reissue. | |
34dc7c2f | 3836 | */ |
b128c09f BB |
3837 | if (zio->io_error && vd == NULL && |
3838 | !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { | |
3839 | ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ | |
3840 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ | |
34dc7c2f | 3841 | zio->io_error = 0; |
b128c09f BB |
3842 | zio->io_flags |= ZIO_FLAG_IO_RETRY | |
3843 | ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; | |
428870ff BB |
3844 | zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; |
3845 | zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, | |
3846 | zio_requeue_io_start_cut_in_line); | |
62840030 | 3847 | return (NULL); |
34dc7c2f BB |
3848 | } |
3849 | ||
b128c09f BB |
3850 | /* |
3851 | * If we got an error on a leaf device, convert it to ENXIO | |
3852 | * if the device is not accessible at all. | |
3853 | */ | |
3854 | if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && | |
3855 | !vdev_accessible(vd, zio)) | |
2e528b49 | 3856 | zio->io_error = SET_ERROR(ENXIO); |
b128c09f BB |
3857 | |
3858 | /* | |
3859 | * If we can't write to an interior vdev (mirror or RAID-Z), | |
3860 | * set vdev_cant_write so that we stop trying to allocate from it. | |
3861 | */ | |
3862 | if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && | |
13fe0198 | 3863 | vd != NULL && !vd->vdev_ops->vdev_op_leaf) { |
b128c09f | 3864 | vd->vdev_cant_write = B_TRUE; |
13fe0198 | 3865 | } |
b128c09f | 3866 | |
298ec40b GM |
3867 | /* |
3868 | * If a cache flush returns ENOTSUP or ENOTTY, we know that no future | |
3869 | * attempts will ever succeed. In this case we set a persistent bit so | |
3870 | * that we don't bother with it in the future. | |
3871 | */ | |
3872 | if ((zio->io_error == ENOTSUP || zio->io_error == ENOTTY) && | |
3873 | zio->io_type == ZIO_TYPE_IOCTL && | |
3874 | zio->io_cmd == DKIOCFLUSHWRITECACHE && vd != NULL) | |
3875 | vd->vdev_nowritecache = B_TRUE; | |
3876 | ||
b128c09f BB |
3877 | if (zio->io_error) |
3878 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; | |
3879 | ||
e8b96c60 MA |
3880 | if (vd != NULL && vd->vdev_ops->vdev_op_leaf && |
3881 | zio->io_physdone != NULL) { | |
3882 | ASSERT(!(zio->io_flags & ZIO_FLAG_DELEGATED)); | |
3883 | ASSERT(zio->io_child_type == ZIO_CHILD_VDEV); | |
3884 | zio->io_physdone(zio->io_logical); | |
3885 | } | |
3886 | ||
62840030 | 3887 | return (zio); |
34dc7c2f BB |
3888 | } |
3889 | ||
3890 | void | |
3891 | zio_vdev_io_reissue(zio_t *zio) | |
3892 | { | |
3893 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); | |
3894 | ASSERT(zio->io_error == 0); | |
3895 | ||
428870ff | 3896 | zio->io_stage >>= 1; |
34dc7c2f BB |
3897 | } |
3898 | ||
3899 | void | |
3900 | zio_vdev_io_redone(zio_t *zio) | |
3901 | { | |
3902 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); | |
3903 | ||
428870ff | 3904 | zio->io_stage >>= 1; |
34dc7c2f BB |
3905 | } |
3906 | ||
3907 | void | |
3908 | zio_vdev_io_bypass(zio_t *zio) | |
3909 | { | |
3910 | ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); | |
3911 | ASSERT(zio->io_error == 0); | |
3912 | ||
3913 | zio->io_flags |= ZIO_FLAG_IO_BYPASS; | |
428870ff | 3914 | zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; |
34dc7c2f BB |
3915 | } |
3916 | ||
b5256303 TC |
3917 | /* |
3918 | * ========================================================================== | |
3919 | * Encrypt and store encryption parameters | |
3920 | * ========================================================================== | |
3921 | */ | |
3922 | ||
3923 | ||
3924 | /* | |
3925 | * This function is used for ZIO_STAGE_ENCRYPT. It is responsible for | |
3926 | * managing the storage of encryption parameters and passing them to the | |
3927 | * lower-level encryption functions. | |
3928 | */ | |
62840030 | 3929 | static zio_t * |
b5256303 TC |
3930 | zio_encrypt(zio_t *zio) |
3931 | { | |
3932 | zio_prop_t *zp = &zio->io_prop; | |
3933 | spa_t *spa = zio->io_spa; | |
3934 | blkptr_t *bp = zio->io_bp; | |
3935 | uint64_t psize = BP_GET_PSIZE(bp); | |
ae76f45c | 3936 | uint64_t dsobj = zio->io_bookmark.zb_objset; |
b5256303 TC |
3937 | dmu_object_type_t ot = BP_GET_TYPE(bp); |
3938 | void *enc_buf = NULL; | |
3939 | abd_t *eabd = NULL; | |
3940 | uint8_t salt[ZIO_DATA_SALT_LEN]; | |
3941 | uint8_t iv[ZIO_DATA_IV_LEN]; | |
3942 | uint8_t mac[ZIO_DATA_MAC_LEN]; | |
3943 | boolean_t no_crypt = B_FALSE; | |
3944 | ||
3945 | /* the root zio already encrypted the data */ | |
3946 | if (zio->io_child_type == ZIO_CHILD_GANG) | |
62840030 | 3947 | return (zio); |
b5256303 TC |
3948 | |
3949 | /* only ZIL blocks are re-encrypted on rewrite */ | |
3950 | if (!IO_IS_ALLOCATING(zio) && ot != DMU_OT_INTENT_LOG) | |
62840030 | 3951 | return (zio); |
b5256303 TC |
3952 | |
3953 | if (!(zp->zp_encrypt || BP_IS_ENCRYPTED(bp))) { | |
3954 | BP_SET_CRYPT(bp, B_FALSE); | |
62840030 | 3955 | return (zio); |
b5256303 TC |
3956 | } |
3957 | ||
3958 | /* if we are doing raw encryption set the provided encryption params */ | |
3959 | if (zio->io_flags & ZIO_FLAG_RAW_ENCRYPT) { | |
ae76f45c | 3960 | ASSERT0(BP_GET_LEVEL(bp)); |
b5256303 TC |
3961 | BP_SET_CRYPT(bp, B_TRUE); |
3962 | BP_SET_BYTEORDER(bp, zp->zp_byteorder); | |
3963 | if (ot != DMU_OT_OBJSET) | |
3964 | zio_crypt_encode_mac_bp(bp, zp->zp_mac); | |
ae76f45c TC |
3965 | |
3966 | /* dnode blocks must be written out in the provided byteorder */ | |
3967 | if (zp->zp_byteorder != ZFS_HOST_BYTEORDER && | |
3968 | ot == DMU_OT_DNODE) { | |
3969 | void *bswap_buf = zio_buf_alloc(psize); | |
3970 | abd_t *babd = abd_get_from_buf(bswap_buf, psize); | |
3971 | ||
3972 | ASSERT3U(BP_GET_COMPRESS(bp), ==, ZIO_COMPRESS_OFF); | |
3973 | abd_copy_to_buf(bswap_buf, zio->io_abd, psize); | |
3974 | dmu_ot_byteswap[DMU_OT_BYTESWAP(ot)].ob_func(bswap_buf, | |
3975 | psize); | |
3976 | ||
3977 | abd_take_ownership_of_buf(babd, B_TRUE); | |
3978 | zio_push_transform(zio, babd, psize, psize, NULL); | |
3979 | } | |
3980 | ||
b5256303 TC |
3981 | if (DMU_OT_IS_ENCRYPTED(ot)) |
3982 | zio_crypt_encode_params_bp(bp, zp->zp_salt, zp->zp_iv); | |
62840030 | 3983 | return (zio); |
b5256303 TC |
3984 | } |
3985 | ||
3986 | /* indirect blocks only maintain a cksum of the lower level MACs */ | |
3987 | if (BP_GET_LEVEL(bp) > 0) { | |
3988 | BP_SET_CRYPT(bp, B_TRUE); | |
3989 | VERIFY0(zio_crypt_do_indirect_mac_checksum_abd(B_TRUE, | |
3990 | zio->io_orig_abd, BP_GET_LSIZE(bp), BP_SHOULD_BYTESWAP(bp), | |
3991 | mac)); | |
3992 | zio_crypt_encode_mac_bp(bp, mac); | |
62840030 | 3993 | return (zio); |
b5256303 TC |
3994 | } |
3995 | ||
3996 | /* | |
3997 | * Objset blocks are a special case since they have 2 256-bit MACs | |
3998 | * embedded within them. | |
3999 | */ | |
4000 | if (ot == DMU_OT_OBJSET) { | |
4001 | ASSERT0(DMU_OT_IS_ENCRYPTED(ot)); | |
4002 | ASSERT3U(BP_GET_COMPRESS(bp), ==, ZIO_COMPRESS_OFF); | |
4003 | BP_SET_CRYPT(bp, B_TRUE); | |
ae76f45c TC |
4004 | VERIFY0(spa_do_crypt_objset_mac_abd(B_TRUE, spa, dsobj, |
4005 | zio->io_abd, psize, BP_SHOULD_BYTESWAP(bp))); | |
62840030 | 4006 | return (zio); |
b5256303 TC |
4007 | } |
4008 | ||
4009 | /* unencrypted object types are only authenticated with a MAC */ | |
4010 | if (!DMU_OT_IS_ENCRYPTED(ot)) { | |
4011 | BP_SET_CRYPT(bp, B_TRUE); | |
ae76f45c TC |
4012 | VERIFY0(spa_do_crypt_mac_abd(B_TRUE, spa, dsobj, |
4013 | zio->io_abd, psize, mac)); | |
b5256303 | 4014 | zio_crypt_encode_mac_bp(bp, mac); |
62840030 | 4015 | return (zio); |
b5256303 TC |
4016 | } |
4017 | ||
4018 | /* | |
4019 | * Later passes of sync-to-convergence may decide to rewrite data | |
4020 | * in place to avoid more disk reallocations. This presents a problem | |
d611989f | 4021 | * for encryption because this constitutes rewriting the new data with |
b5256303 TC |
4022 | * the same encryption key and IV. However, this only applies to blocks |
4023 | * in the MOS (particularly the spacemaps) and we do not encrypt the | |
4024 | * MOS. We assert that the zio is allocating or an intent log write | |
4025 | * to enforce this. | |
4026 | */ | |
4027 | ASSERT(IO_IS_ALLOCATING(zio) || ot == DMU_OT_INTENT_LOG); | |
4028 | ASSERT(BP_GET_LEVEL(bp) == 0 || ot == DMU_OT_INTENT_LOG); | |
4029 | ASSERT(spa_feature_is_active(spa, SPA_FEATURE_ENCRYPTION)); | |
4030 | ASSERT3U(psize, !=, 0); | |
4031 | ||
4032 | enc_buf = zio_buf_alloc(psize); | |
4033 | eabd = abd_get_from_buf(enc_buf, psize); | |
4034 | abd_take_ownership_of_buf(eabd, B_TRUE); | |
4035 | ||
4036 | /* | |
4037 | * For an explanation of what encryption parameters are stored | |
4038 | * where, see the block comment in zio_crypt.c. | |
4039 | */ | |
4040 | if (ot == DMU_OT_INTENT_LOG) { | |
4041 | zio_crypt_decode_params_bp(bp, salt, iv); | |
4042 | } else { | |
4043 | BP_SET_CRYPT(bp, B_TRUE); | |
4044 | } | |
4045 | ||
4046 | /* Perform the encryption. This should not fail */ | |
be9a5c35 TC |
4047 | VERIFY0(spa_do_crypt_abd(B_TRUE, spa, &zio->io_bookmark, |
4048 | BP_GET_TYPE(bp), BP_GET_DEDUP(bp), BP_SHOULD_BYTESWAP(bp), | |
4049 | salt, iv, mac, psize, zio->io_abd, eabd, &no_crypt)); | |
b5256303 TC |
4050 | |
4051 | /* encode encryption metadata into the bp */ | |
4052 | if (ot == DMU_OT_INTENT_LOG) { | |
4053 | /* | |
4054 | * ZIL blocks store the MAC in the embedded checksum, so the | |
4055 | * transform must always be applied. | |
4056 | */ | |
4057 | zio_crypt_encode_mac_zil(enc_buf, mac); | |
4058 | zio_push_transform(zio, eabd, psize, psize, NULL); | |
4059 | } else { | |
4060 | BP_SET_CRYPT(bp, B_TRUE); | |
4061 | zio_crypt_encode_params_bp(bp, salt, iv); | |
4062 | zio_crypt_encode_mac_bp(bp, mac); | |
4063 | ||
4064 | if (no_crypt) { | |
4065 | ASSERT3U(ot, ==, DMU_OT_DNODE); | |
4066 | abd_free(eabd); | |
4067 | } else { | |
4068 | zio_push_transform(zio, eabd, psize, psize, NULL); | |
4069 | } | |
4070 | } | |
4071 | ||
62840030 | 4072 | return (zio); |
b5256303 TC |
4073 | } |
4074 | ||
34dc7c2f BB |
4075 | /* |
4076 | * ========================================================================== | |
4077 | * Generate and verify checksums | |
4078 | * ========================================================================== | |
4079 | */ | |
62840030 | 4080 | static zio_t * |
34dc7c2f BB |
4081 | zio_checksum_generate(zio_t *zio) |
4082 | { | |
34dc7c2f | 4083 | blkptr_t *bp = zio->io_bp; |
b128c09f | 4084 | enum zio_checksum checksum; |
34dc7c2f | 4085 | |
b128c09f BB |
4086 | if (bp == NULL) { |
4087 | /* | |
4088 | * This is zio_write_phys(). | |
4089 | * We're either generating a label checksum, or none at all. | |
4090 | */ | |
4091 | checksum = zio->io_prop.zp_checksum; | |
34dc7c2f | 4092 | |
b128c09f | 4093 | if (checksum == ZIO_CHECKSUM_OFF) |
62840030 | 4094 | return (zio); |
b128c09f BB |
4095 | |
4096 | ASSERT(checksum == ZIO_CHECKSUM_LABEL); | |
4097 | } else { | |
4098 | if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { | |
4099 | ASSERT(!IO_IS_ALLOCATING(zio)); | |
4100 | checksum = ZIO_CHECKSUM_GANG_HEADER; | |
4101 | } else { | |
4102 | checksum = BP_GET_CHECKSUM(bp); | |
4103 | } | |
4104 | } | |
34dc7c2f | 4105 | |
a6255b7f | 4106 | zio_checksum_compute(zio, checksum, zio->io_abd, zio->io_size); |
34dc7c2f | 4107 | |
62840030 | 4108 | return (zio); |
34dc7c2f BB |
4109 | } |
4110 | ||
62840030 | 4111 | static zio_t * |
b128c09f | 4112 | zio_checksum_verify(zio_t *zio) |
34dc7c2f | 4113 | { |
428870ff | 4114 | zio_bad_cksum_t info; |
b128c09f BB |
4115 | blkptr_t *bp = zio->io_bp; |
4116 | int error; | |
34dc7c2f | 4117 | |
428870ff BB |
4118 | ASSERT(zio->io_vd != NULL); |
4119 | ||
b128c09f BB |
4120 | if (bp == NULL) { |
4121 | /* | |
4122 | * This is zio_read_phys(). | |
4123 | * We're either verifying a label checksum, or nothing at all. | |
4124 | */ | |
4125 | if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) | |
62840030 | 4126 | return (zio); |
34dc7c2f | 4127 | |
b128c09f BB |
4128 | ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); |
4129 | } | |
34dc7c2f | 4130 | |
428870ff | 4131 | if ((error = zio_checksum_error(zio, &info)) != 0) { |
b128c09f | 4132 | zio->io_error = error; |
7a3066ff MA |
4133 | if (error == ECKSUM && |
4134 | !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { | |
428870ff | 4135 | zfs_ereport_start_checksum(zio->io_spa, |
b5256303 TC |
4136 | zio->io_vd, &zio->io_bookmark, zio, |
4137 | zio->io_offset, zio->io_size, NULL, &info); | |
b128c09f | 4138 | } |
34dc7c2f BB |
4139 | } |
4140 | ||
62840030 | 4141 | return (zio); |
34dc7c2f BB |
4142 | } |
4143 | ||
4144 | /* | |
4145 | * Called by RAID-Z to ensure we don't compute the checksum twice. | |
4146 | */ | |
4147 | void | |
4148 | zio_checksum_verified(zio_t *zio) | |
4149 | { | |
428870ff | 4150 | zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; |
34dc7c2f BB |
4151 | } |
4152 | ||
4153 | /* | |
b128c09f BB |
4154 | * ========================================================================== |
4155 | * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. | |
9b67f605 | 4156 | * An error of 0 indicates success. ENXIO indicates whole-device failure, |
d611989f | 4157 | * which may be transient (e.g. unplugged) or permanent. ECKSUM and EIO |
b128c09f BB |
4158 | * indicate errors that are specific to one I/O, and most likely permanent. |
4159 | * Any other error is presumed to be worse because we weren't expecting it. | |
4160 | * ========================================================================== | |
34dc7c2f | 4161 | */ |
b128c09f BB |
4162 | int |
4163 | zio_worst_error(int e1, int e2) | |
34dc7c2f | 4164 | { |
b128c09f BB |
4165 | static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; |
4166 | int r1, r2; | |
4167 | ||
4168 | for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) | |
4169 | if (e1 == zio_error_rank[r1]) | |
4170 | break; | |
34dc7c2f | 4171 | |
b128c09f BB |
4172 | for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) |
4173 | if (e2 == zio_error_rank[r2]) | |
4174 | break; | |
4175 | ||
4176 | return (r1 > r2 ? e1 : e2); | |
34dc7c2f BB |
4177 | } |
4178 | ||
4179 | /* | |
4180 | * ========================================================================== | |
b128c09f | 4181 | * I/O completion |
34dc7c2f BB |
4182 | * ========================================================================== |
4183 | */ | |
62840030 | 4184 | static zio_t * |
b128c09f | 4185 | zio_ready(zio_t *zio) |
34dc7c2f | 4186 | { |
b128c09f | 4187 | blkptr_t *bp = zio->io_bp; |
d164b209 | 4188 | zio_t *pio, *pio_next; |
3dfb57a3 | 4189 | zio_link_t *zl = NULL; |
34dc7c2f | 4190 | |
ddc751d5 GW |
4191 | if (zio_wait_for_children(zio, ZIO_CHILD_GANG_BIT | ZIO_CHILD_DDT_BIT, |
4192 | ZIO_WAIT_READY)) { | |
62840030 | 4193 | return (NULL); |
ddc751d5 | 4194 | } |
34dc7c2f | 4195 | |
9babb374 | 4196 | if (zio->io_ready) { |
b128c09f | 4197 | ASSERT(IO_IS_ALLOCATING(zio)); |
03c6040b GW |
4198 | ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp) || |
4199 | (zio->io_flags & ZIO_FLAG_NOPWRITE)); | |
b128c09f | 4200 | ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); |
34dc7c2f | 4201 | |
b128c09f BB |
4202 | zio->io_ready(zio); |
4203 | } | |
34dc7c2f | 4204 | |
b128c09f BB |
4205 | if (bp != NULL && bp != &zio->io_bp_copy) |
4206 | zio->io_bp_copy = *bp; | |
34dc7c2f | 4207 | |
3dfb57a3 | 4208 | if (zio->io_error != 0) { |
b128c09f | 4209 | zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; |
34dc7c2f | 4210 | |
3dfb57a3 DB |
4211 | if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING) { |
4212 | ASSERT(IO_IS_ALLOCATING(zio)); | |
4213 | ASSERT(zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); | |
cc99f275 DB |
4214 | ASSERT(zio->io_metaslab_class != NULL); |
4215 | ||
3dfb57a3 DB |
4216 | /* |
4217 | * We were unable to allocate anything, unreserve and | |
4218 | * issue the next I/O to allocate. | |
4219 | */ | |
4220 | metaslab_class_throttle_unreserve( | |
cc99f275 DB |
4221 | zio->io_metaslab_class, zio->io_prop.zp_copies, |
4222 | zio->io_allocator, zio); | |
492f64e9 | 4223 | zio_allocate_dispatch(zio->io_spa, zio->io_allocator); |
3dfb57a3 DB |
4224 | } |
4225 | } | |
4226 | ||
d164b209 BB |
4227 | mutex_enter(&zio->io_lock); |
4228 | zio->io_state[ZIO_WAIT_READY] = 1; | |
3dfb57a3 | 4229 | pio = zio_walk_parents(zio, &zl); |
d164b209 BB |
4230 | mutex_exit(&zio->io_lock); |
4231 | ||
4232 | /* | |
4233 | * As we notify zio's parents, new parents could be added. | |
4234 | * New parents go to the head of zio's io_parent_list, however, | |
4235 | * so we will (correctly) not notify them. The remainder of zio's | |
4236 | * io_parent_list, from 'pio_next' onward, cannot change because | |
4237 | * all parents must wait for us to be done before they can be done. | |
4238 | */ | |
4239 | for (; pio != NULL; pio = pio_next) { | |
3dfb57a3 | 4240 | pio_next = zio_walk_parents(zio, &zl); |
62840030 | 4241 | zio_notify_parent(pio, zio, ZIO_WAIT_READY, NULL); |
d164b209 | 4242 | } |
34dc7c2f | 4243 | |
428870ff BB |
4244 | if (zio->io_flags & ZIO_FLAG_NODATA) { |
4245 | if (BP_IS_GANG(bp)) { | |
4246 | zio->io_flags &= ~ZIO_FLAG_NODATA; | |
4247 | } else { | |
a6255b7f | 4248 | ASSERT((uintptr_t)zio->io_abd < SPA_MAXBLOCKSIZE); |
428870ff BB |
4249 | zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; |
4250 | } | |
4251 | } | |
4252 | ||
4253 | if (zio_injection_enabled && | |
4254 | zio->io_spa->spa_syncing_txg == zio->io_txg) | |
4255 | zio_handle_ignored_writes(zio); | |
4256 | ||
62840030 | 4257 | return (zio); |
34dc7c2f BB |
4258 | } |
4259 | ||
3dfb57a3 DB |
4260 | /* |
4261 | * Update the allocation throttle accounting. | |
4262 | */ | |
4263 | static void | |
4264 | zio_dva_throttle_done(zio_t *zio) | |
4265 | { | |
1c27024e | 4266 | ASSERTV(zio_t *lio = zio->io_logical); |
3dfb57a3 DB |
4267 | zio_t *pio = zio_unique_parent(zio); |
4268 | vdev_t *vd = zio->io_vd; | |
4269 | int flags = METASLAB_ASYNC_ALLOC; | |
4270 | ||
4271 | ASSERT3P(zio->io_bp, !=, NULL); | |
4272 | ASSERT3U(zio->io_type, ==, ZIO_TYPE_WRITE); | |
4273 | ASSERT3U(zio->io_priority, ==, ZIO_PRIORITY_ASYNC_WRITE); | |
4274 | ASSERT3U(zio->io_child_type, ==, ZIO_CHILD_VDEV); | |
4275 | ASSERT(vd != NULL); | |
4276 | ASSERT3P(vd, ==, vd->vdev_top); | |
21df134f SB |
4277 | ASSERT(zio_injection_enabled || !(zio->io_flags & ZIO_FLAG_IO_RETRY)); |
4278 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REPAIR)); | |
3dfb57a3 DB |
4279 | ASSERT(zio->io_flags & ZIO_FLAG_IO_ALLOCATING); |
4280 | ASSERT(!(lio->io_flags & ZIO_FLAG_IO_REWRITE)); | |
4281 | ASSERT(!(lio->io_orig_flags & ZIO_FLAG_NODATA)); | |
4282 | ||
4283 | /* | |
4284 | * Parents of gang children can have two flavors -- ones that | |
4285 | * allocated the gang header (will have ZIO_FLAG_IO_REWRITE set) | |
4286 | * and ones that allocated the constituent blocks. The allocation | |
4287 | * throttle needs to know the allocating parent zio so we must find | |
4288 | * it here. | |
4289 | */ | |
4290 | if (pio->io_child_type == ZIO_CHILD_GANG) { | |
4291 | /* | |
4292 | * If our parent is a rewrite gang child then our grandparent | |
4293 | * would have been the one that performed the allocation. | |
4294 | */ | |
4295 | if (pio->io_flags & ZIO_FLAG_IO_REWRITE) | |
4296 | pio = zio_unique_parent(pio); | |
4297 | flags |= METASLAB_GANG_CHILD; | |
4298 | } | |
4299 | ||
4300 | ASSERT(IO_IS_ALLOCATING(pio)); | |
4301 | ASSERT3P(zio, !=, zio->io_logical); | |
4302 | ASSERT(zio->io_logical != NULL); | |
4303 | ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REPAIR)); | |
4304 | ASSERT0(zio->io_flags & ZIO_FLAG_NOPWRITE); | |
cc99f275 | 4305 | ASSERT(zio->io_metaslab_class != NULL); |
3dfb57a3 DB |
4306 | |
4307 | mutex_enter(&pio->io_lock); | |
492f64e9 PD |
4308 | metaslab_group_alloc_decrement(zio->io_spa, vd->vdev_id, pio, flags, |
4309 | pio->io_allocator, B_TRUE); | |
3dfb57a3 DB |
4310 | mutex_exit(&pio->io_lock); |
4311 | ||
cc99f275 DB |
4312 | metaslab_class_throttle_unreserve(zio->io_metaslab_class, 1, |
4313 | pio->io_allocator, pio); | |
3dfb57a3 DB |
4314 | |
4315 | /* | |
4316 | * Call into the pipeline to see if there is more work that | |
4317 | * needs to be done. If there is work to be done it will be | |
4318 | * dispatched to another taskq thread. | |
4319 | */ | |
492f64e9 | 4320 | zio_allocate_dispatch(zio->io_spa, pio->io_allocator); |
3dfb57a3 DB |
4321 | } |
4322 | ||
62840030 | 4323 | static zio_t * |
b128c09f | 4324 | zio_done(zio_t *zio) |
34dc7c2f | 4325 | { |
3dfb57a3 DB |
4326 | /* |
4327 | * Always attempt to keep stack usage minimal here since | |
d611989f | 4328 | * we can be called recursively up to 19 levels deep. |
3dfb57a3 | 4329 | */ |
84c07ada | 4330 | const uint64_t psize = zio->io_size; |
d164b209 | 4331 | zio_t *pio, *pio_next; |
3dfb57a3 | 4332 | zio_link_t *zl = NULL; |
34dc7c2f | 4333 | |
b128c09f | 4334 | /* |
9babb374 | 4335 | * If our children haven't all completed, |
b128c09f BB |
4336 | * wait for them and then repeat this pipeline stage. |
4337 | */ | |
ddc751d5 | 4338 | if (zio_wait_for_children(zio, ZIO_CHILD_ALL_BITS, ZIO_WAIT_DONE)) { |
62840030 | 4339 | return (NULL); |
ddc751d5 | 4340 | } |
34dc7c2f | 4341 | |
3dfb57a3 DB |
4342 | /* |
4343 | * If the allocation throttle is enabled, then update the accounting. | |
4344 | * We only track child I/Os that are part of an allocating async | |
4345 | * write. We must do this since the allocation is performed | |
4346 | * by the logical I/O but the actual write is done by child I/Os. | |
4347 | */ | |
4348 | if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING && | |
4349 | zio->io_child_type == ZIO_CHILD_VDEV) { | |
cc99f275 DB |
4350 | ASSERT(zio->io_metaslab_class != NULL); |
4351 | ASSERT(zio->io_metaslab_class->mc_alloc_throttle_enabled); | |
3dfb57a3 DB |
4352 | zio_dva_throttle_done(zio); |
4353 | } | |
4354 | ||
4355 | /* | |
4356 | * If the allocation throttle is enabled, verify that | |
4357 | * we have decremented the refcounts for every I/O that was throttled. | |
4358 | */ | |
4359 | if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING) { | |
4360 | ASSERT(zio->io_type == ZIO_TYPE_WRITE); | |
4361 | ASSERT(zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); | |
4362 | ASSERT(zio->io_bp != NULL); | |
cc99f275 | 4363 | |
492f64e9 PD |
4364 | metaslab_group_alloc_verify(zio->io_spa, zio->io_bp, zio, |
4365 | zio->io_allocator); | |
424fd7c3 | 4366 | VERIFY(zfs_refcount_not_held( |
cc99f275 | 4367 | &zio->io_metaslab_class->mc_alloc_slots[zio->io_allocator], |
492f64e9 | 4368 | zio)); |
3dfb57a3 DB |
4369 | } |
4370 | ||
4371 | ||
1c27024e DB |
4372 | for (int c = 0; c < ZIO_CHILD_TYPES; c++) |
4373 | for (int w = 0; w < ZIO_WAIT_TYPES; w++) | |
b128c09f BB |
4374 | ASSERT(zio->io_children[c][w] == 0); |
4375 | ||
9b67f605 | 4376 | if (zio->io_bp != NULL && !BP_IS_EMBEDDED(zio->io_bp)) { |
c776b317 BB |
4377 | ASSERT(zio->io_bp->blk_pad[0] == 0); |
4378 | ASSERT(zio->io_bp->blk_pad[1] == 0); | |
d1d7e268 MK |
4379 | ASSERT(bcmp(zio->io_bp, &zio->io_bp_copy, |
4380 | sizeof (blkptr_t)) == 0 || | |
c776b317 BB |
4381 | (zio->io_bp == zio_unique_parent(zio)->io_bp)); |
4382 | if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(zio->io_bp) && | |
428870ff | 4383 | zio->io_bp_override == NULL && |
b128c09f | 4384 | !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { |
d1d7e268 MK |
4385 | ASSERT3U(zio->io_prop.zp_copies, <=, |
4386 | BP_GET_NDVAS(zio->io_bp)); | |
c776b317 | 4387 | ASSERT(BP_COUNT_GANG(zio->io_bp) == 0 || |
d1d7e268 MK |
4388 | (BP_COUNT_GANG(zio->io_bp) == |
4389 | BP_GET_NDVAS(zio->io_bp))); | |
b128c09f | 4390 | } |
03c6040b GW |
4391 | if (zio->io_flags & ZIO_FLAG_NOPWRITE) |
4392 | VERIFY(BP_EQUAL(zio->io_bp, &zio->io_bp_orig)); | |
b128c09f BB |
4393 | } |
4394 | ||
4395 | /* | |
428870ff | 4396 | * If there were child vdev/gang/ddt errors, they apply to us now. |
b128c09f BB |
4397 | */ |
4398 | zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); | |
4399 | zio_inherit_child_errors(zio, ZIO_CHILD_GANG); | |
428870ff BB |
4400 | zio_inherit_child_errors(zio, ZIO_CHILD_DDT); |
4401 | ||
4402 | /* | |
4403 | * If the I/O on the transformed data was successful, generate any | |
4404 | * checksum reports now while we still have the transformed data. | |
4405 | */ | |
4406 | if (zio->io_error == 0) { | |
4407 | while (zio->io_cksum_report != NULL) { | |
4408 | zio_cksum_report_t *zcr = zio->io_cksum_report; | |
4409 | uint64_t align = zcr->zcr_align; | |
a6255b7f | 4410 | uint64_t asize = P2ROUNDUP(psize, align); |
a6255b7f DQ |
4411 | abd_t *adata = zio->io_abd; |
4412 | ||
4413 | if (asize != psize) { | |
84c07ada | 4414 | adata = abd_alloc(asize, B_TRUE); |
a6255b7f DQ |
4415 | abd_copy(adata, zio->io_abd, psize); |
4416 | abd_zero_off(adata, psize, asize - psize); | |
428870ff BB |
4417 | } |
4418 | ||
4419 | zio->io_cksum_report = zcr->zcr_next; | |
4420 | zcr->zcr_next = NULL; | |
84c07ada | 4421 | zcr->zcr_finish(zcr, adata); |
428870ff BB |
4422 | zfs_ereport_free_checksum(zcr); |
4423 | ||
a6255b7f DQ |
4424 | if (asize != psize) |
4425 | abd_free(adata); | |
428870ff BB |
4426 | } |
4427 | } | |
b128c09f BB |
4428 | |
4429 | zio_pop_transforms(zio); /* note: may set zio->io_error */ | |
4430 | ||
a6255b7f | 4431 | vdev_stat_update(zio, psize); |
b128c09f | 4432 | |
a69052be | 4433 | /* |
cc92e9d0 | 4434 | * If this I/O is attached to a particular vdev is slow, exceeding |
72f53c56 MJ |
4435 | * 30 seconds to complete, post an error described the I/O delay. |
4436 | * We ignore these errors if the device is currently unavailable. | |
a69052be | 4437 | */ |
ad796b8a TH |
4438 | if (zio->io_delay >= MSEC2NSEC(zio_slow_io_ms)) { |
4439 | if (zio->io_vd != NULL && !vdev_is_dead(zio->io_vd)) { | |
4440 | /* | |
4441 | * We want to only increment our slow IO counters if | |
4442 | * the IO is valid (i.e. not if the drive is removed). | |
4443 | * | |
4444 | * zfs_ereport_post() will also do these checks, but | |
4445 | * it can also ratelimit and have other failures, so we | |
4446 | * need to increment the slow_io counters independent | |
4447 | * of it. | |
4448 | */ | |
4449 | if (zfs_ereport_is_valid(FM_EREPORT_ZFS_DELAY, | |
4450 | zio->io_spa, zio->io_vd, zio)) { | |
4451 | mutex_enter(&zio->io_vd->vdev_stat_lock); | |
4452 | zio->io_vd->vdev_stat.vs_slow_ios++; | |
4453 | mutex_exit(&zio->io_vd->vdev_stat_lock); | |
4454 | ||
4455 | zfs_ereport_post(FM_EREPORT_ZFS_DELAY, | |
4456 | zio->io_spa, zio->io_vd, &zio->io_bookmark, | |
4457 | zio, 0, 0); | |
4458 | } | |
4459 | } | |
72f53c56 | 4460 | } |
a69052be | 4461 | |
b128c09f BB |
4462 | if (zio->io_error) { |
4463 | /* | |
4464 | * If this I/O is attached to a particular vdev, | |
4465 | * generate an error message describing the I/O failure | |
4466 | * at the block level. We ignore these errors if the | |
4467 | * device is currently unavailable. | |
4468 | */ | |
c776b317 | 4469 | if (zio->io_error != ECKSUM && zio->io_vd != NULL && |
02730c33 | 4470 | !vdev_is_dead(zio->io_vd)) |
c776b317 | 4471 | zfs_ereport_post(FM_EREPORT_ZFS_IO, zio->io_spa, |
b5256303 | 4472 | zio->io_vd, &zio->io_bookmark, zio, 0, 0); |
34dc7c2f | 4473 | |
428870ff BB |
4474 | if ((zio->io_error == EIO || !(zio->io_flags & |
4475 | (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && | |
c776b317 | 4476 | zio == zio->io_logical) { |
b128c09f BB |
4477 | /* |
4478 | * For logical I/O requests, tell the SPA to log the | |
4479 | * error and generate a logical data ereport. | |
4480 | */ | |
b5256303 | 4481 | spa_log_error(zio->io_spa, &zio->io_bookmark); |
d1d7e268 | 4482 | zfs_ereport_post(FM_EREPORT_ZFS_DATA, zio->io_spa, |
b5256303 | 4483 | NULL, &zio->io_bookmark, zio, 0, 0); |
b128c09f BB |
4484 | } |
4485 | } | |
34dc7c2f | 4486 | |
c776b317 | 4487 | if (zio->io_error && zio == zio->io_logical) { |
b128c09f BB |
4488 | /* |
4489 | * Determine whether zio should be reexecuted. This will | |
4490 | * propagate all the way to the root via zio_notify_parent(). | |
4491 | */ | |
c776b317 | 4492 | ASSERT(zio->io_vd == NULL && zio->io_bp != NULL); |
428870ff | 4493 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); |
b128c09f | 4494 | |
428870ff BB |
4495 | if (IO_IS_ALLOCATING(zio) && |
4496 | !(zio->io_flags & ZIO_FLAG_CANFAIL)) { | |
b128c09f BB |
4497 | if (zio->io_error != ENOSPC) |
4498 | zio->io_reexecute |= ZIO_REEXECUTE_NOW; | |
4499 | else | |
4500 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
428870ff | 4501 | } |
b128c09f BB |
4502 | |
4503 | if ((zio->io_type == ZIO_TYPE_READ || | |
4504 | zio->io_type == ZIO_TYPE_FREE) && | |
572e2857 | 4505 | !(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && |
b128c09f | 4506 | zio->io_error == ENXIO && |
c776b317 BB |
4507 | spa_load_state(zio->io_spa) == SPA_LOAD_NONE && |
4508 | spa_get_failmode(zio->io_spa) != ZIO_FAILURE_MODE_CONTINUE) | |
b128c09f BB |
4509 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; |
4510 | ||
4511 | if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) | |
4512 | zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; | |
428870ff BB |
4513 | |
4514 | /* | |
4515 | * Here is a possibly good place to attempt to do | |
4516 | * either combinatorial reconstruction or error correction | |
4517 | * based on checksums. It also might be a good place | |
4518 | * to send out preliminary ereports before we suspend | |
4519 | * processing. | |
4520 | */ | |
34dc7c2f BB |
4521 | } |
4522 | ||
4523 | /* | |
b128c09f BB |
4524 | * If there were logical child errors, they apply to us now. |
4525 | * We defer this until now to avoid conflating logical child | |
4526 | * errors with errors that happened to the zio itself when | |
4527 | * updating vdev stats and reporting FMA events above. | |
34dc7c2f | 4528 | */ |
b128c09f | 4529 | zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); |
34dc7c2f | 4530 | |
428870ff BB |
4531 | if ((zio->io_error || zio->io_reexecute) && |
4532 | IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && | |
03c6040b | 4533 | !(zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE))) |
c776b317 | 4534 | zio_dva_unallocate(zio, zio->io_gang_tree, zio->io_bp); |
9babb374 BB |
4535 | |
4536 | zio_gang_tree_free(&zio->io_gang_tree); | |
4537 | ||
4538 | /* | |
4539 | * Godfather I/Os should never suspend. | |
4540 | */ | |
4541 | if ((zio->io_flags & ZIO_FLAG_GODFATHER) && | |
4542 | (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) | |
a32494d2 | 4543 | zio->io_reexecute &= ~ZIO_REEXECUTE_SUSPEND; |
9babb374 | 4544 | |
b128c09f BB |
4545 | if (zio->io_reexecute) { |
4546 | /* | |
4547 | * This is a logical I/O that wants to reexecute. | |
4548 | * | |
4549 | * Reexecute is top-down. When an i/o fails, if it's not | |
4550 | * the root, it simply notifies its parent and sticks around. | |
4551 | * The parent, seeing that it still has children in zio_done(), | |
4552 | * does the same. This percolates all the way up to the root. | |
4553 | * The root i/o will reexecute or suspend the entire tree. | |
4554 | * | |
4555 | * This approach ensures that zio_reexecute() honors | |
4556 | * all the original i/o dependency relationships, e.g. | |
4557 | * parents not executing until children are ready. | |
4558 | */ | |
4559 | ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); | |
34dc7c2f | 4560 | |
9babb374 | 4561 | zio->io_gang_leader = NULL; |
b128c09f | 4562 | |
d164b209 BB |
4563 | mutex_enter(&zio->io_lock); |
4564 | zio->io_state[ZIO_WAIT_DONE] = 1; | |
4565 | mutex_exit(&zio->io_lock); | |
4566 | ||
9babb374 BB |
4567 | /* |
4568 | * "The Godfather" I/O monitors its children but is | |
4569 | * not a true parent to them. It will track them through | |
4570 | * the pipeline but severs its ties whenever they get into | |
4571 | * trouble (e.g. suspended). This allows "The Godfather" | |
4572 | * I/O to return status without blocking. | |
4573 | */ | |
3dfb57a3 DB |
4574 | zl = NULL; |
4575 | for (pio = zio_walk_parents(zio, &zl); pio != NULL; | |
4576 | pio = pio_next) { | |
4577 | zio_link_t *remove_zl = zl; | |
4578 | pio_next = zio_walk_parents(zio, &zl); | |
9babb374 BB |
4579 | |
4580 | if ((pio->io_flags & ZIO_FLAG_GODFATHER) && | |
4581 | (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { | |
3dfb57a3 | 4582 | zio_remove_child(pio, zio, remove_zl); |
62840030 MA |
4583 | /* |
4584 | * This is a rare code path, so we don't | |
4585 | * bother with "next_to_execute". | |
4586 | */ | |
4587 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE, | |
4588 | NULL); | |
9babb374 BB |
4589 | } |
4590 | } | |
4591 | ||
d164b209 | 4592 | if ((pio = zio_unique_parent(zio)) != NULL) { |
b128c09f BB |
4593 | /* |
4594 | * We're not a root i/o, so there's nothing to do | |
4595 | * but notify our parent. Don't propagate errors | |
4596 | * upward since we haven't permanently failed yet. | |
4597 | */ | |
9babb374 | 4598 | ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); |
b128c09f | 4599 | zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; |
62840030 MA |
4600 | /* |
4601 | * This is a rare code path, so we don't bother with | |
4602 | * "next_to_execute". | |
4603 | */ | |
4604 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE, NULL); | |
b128c09f BB |
4605 | } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { |
4606 | /* | |
4607 | * We'd fail again if we reexecuted now, so suspend | |
4608 | * until conditions improve (e.g. device comes online). | |
4609 | */ | |
cec3a0a1 | 4610 | zio_suspend(zio->io_spa, zio, ZIO_SUSPEND_IOERR); |
b128c09f BB |
4611 | } else { |
4612 | /* | |
4613 | * Reexecution is potentially a huge amount of work. | |
4614 | * Hand it off to the otherwise-unused claim taskq. | |
4615 | */ | |
a38718a6 | 4616 | ASSERT(taskq_empty_ent(&zio->io_tqent)); |
7ef5e54e AL |
4617 | spa_taskq_dispatch_ent(zio->io_spa, |
4618 | ZIO_TYPE_CLAIM, ZIO_TASKQ_ISSUE, | |
a38718a6 GA |
4619 | (task_func_t *)zio_reexecute, zio, 0, |
4620 | &zio->io_tqent); | |
b128c09f | 4621 | } |
62840030 | 4622 | return (NULL); |
34dc7c2f BB |
4623 | } |
4624 | ||
428870ff | 4625 | ASSERT(zio->io_child_count == 0); |
b128c09f BB |
4626 | ASSERT(zio->io_reexecute == 0); |
4627 | ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); | |
34dc7c2f | 4628 | |
428870ff BB |
4629 | /* |
4630 | * Report any checksum errors, since the I/O is complete. | |
4631 | */ | |
4632 | while (zio->io_cksum_report != NULL) { | |
4633 | zio_cksum_report_t *zcr = zio->io_cksum_report; | |
4634 | zio->io_cksum_report = zcr->zcr_next; | |
4635 | zcr->zcr_next = NULL; | |
4636 | zcr->zcr_finish(zcr, NULL); | |
4637 | zfs_ereport_free_checksum(zcr); | |
4638 | } | |
4639 | ||
920dd524 | 4640 | if (zio->io_flags & ZIO_FLAG_FASTWRITE && zio->io_bp && |
9b67f605 MA |
4641 | !BP_IS_HOLE(zio->io_bp) && !BP_IS_EMBEDDED(zio->io_bp) && |
4642 | !(zio->io_flags & ZIO_FLAG_NOPWRITE)) { | |
920dd524 ED |
4643 | metaslab_fastwrite_unmark(zio->io_spa, zio->io_bp); |
4644 | } | |
4645 | ||
d164b209 BB |
4646 | /* |
4647 | * It is the responsibility of the done callback to ensure that this | |
4648 | * particular zio is no longer discoverable for adoption, and as | |
4649 | * such, cannot acquire any new parents. | |
4650 | */ | |
b128c09f BB |
4651 | if (zio->io_done) |
4652 | zio->io_done(zio); | |
34dc7c2f | 4653 | |
d164b209 BB |
4654 | mutex_enter(&zio->io_lock); |
4655 | zio->io_state[ZIO_WAIT_DONE] = 1; | |
4656 | mutex_exit(&zio->io_lock); | |
34dc7c2f | 4657 | |
62840030 MA |
4658 | /* |
4659 | * We are done executing this zio. We may want to execute a parent | |
4660 | * next. See the comment in zio_notify_parent(). | |
4661 | */ | |
4662 | zio_t *next_to_execute = NULL; | |
3dfb57a3 DB |
4663 | zl = NULL; |
4664 | for (pio = zio_walk_parents(zio, &zl); pio != NULL; pio = pio_next) { | |
4665 | zio_link_t *remove_zl = zl; | |
4666 | pio_next = zio_walk_parents(zio, &zl); | |
4667 | zio_remove_child(pio, zio, remove_zl); | |
62840030 | 4668 | zio_notify_parent(pio, zio, ZIO_WAIT_DONE, &next_to_execute); |
b128c09f | 4669 | } |
34dc7c2f | 4670 | |
b128c09f BB |
4671 | if (zio->io_waiter != NULL) { |
4672 | mutex_enter(&zio->io_lock); | |
4673 | zio->io_executor = NULL; | |
4674 | cv_broadcast(&zio->io_cv); | |
4675 | mutex_exit(&zio->io_lock); | |
4676 | } else { | |
4677 | zio_destroy(zio); | |
4678 | } | |
34dc7c2f | 4679 | |
62840030 | 4680 | return (next_to_execute); |
34dc7c2f BB |
4681 | } |
4682 | ||
4683 | /* | |
b128c09f BB |
4684 | * ========================================================================== |
4685 | * I/O pipeline definition | |
4686 | * ========================================================================== | |
34dc7c2f | 4687 | */ |
428870ff | 4688 | static zio_pipe_stage_t *zio_pipeline[] = { |
b128c09f | 4689 | NULL, |
b128c09f | 4690 | zio_read_bp_init, |
3dfb57a3 | 4691 | zio_write_bp_init, |
428870ff BB |
4692 | zio_free_bp_init, |
4693 | zio_issue_async, | |
3dfb57a3 | 4694 | zio_write_compress, |
b5256303 | 4695 | zio_encrypt, |
b128c09f | 4696 | zio_checksum_generate, |
03c6040b | 4697 | zio_nop_write, |
428870ff BB |
4698 | zio_ddt_read_start, |
4699 | zio_ddt_read_done, | |
4700 | zio_ddt_write, | |
4701 | zio_ddt_free, | |
b128c09f BB |
4702 | zio_gang_assemble, |
4703 | zio_gang_issue, | |
3dfb57a3 | 4704 | zio_dva_throttle, |
b128c09f BB |
4705 | zio_dva_allocate, |
4706 | zio_dva_free, | |
4707 | zio_dva_claim, | |
4708 | zio_ready, | |
4709 | zio_vdev_io_start, | |
4710 | zio_vdev_io_done, | |
4711 | zio_vdev_io_assess, | |
4712 | zio_checksum_verify, | |
4713 | zio_done | |
4714 | }; | |
c28b2279 | 4715 | |
9ae529ec | 4716 | |
9ae529ec | 4717 | |
9ae529ec | 4718 | |
fcff0f35 PD |
4719 | /* |
4720 | * Compare two zbookmark_phys_t's to see which we would reach first in a | |
4721 | * pre-order traversal of the object tree. | |
4722 | * | |
4723 | * This is simple in every case aside from the meta-dnode object. For all other | |
4724 | * objects, we traverse them in order (object 1 before object 2, and so on). | |
4725 | * However, all of these objects are traversed while traversing object 0, since | |
4726 | * the data it points to is the list of objects. Thus, we need to convert to a | |
4727 | * canonical representation so we can compare meta-dnode bookmarks to | |
4728 | * non-meta-dnode bookmarks. | |
4729 | * | |
4730 | * We do this by calculating "equivalents" for each field of the zbookmark. | |
4731 | * zbookmarks outside of the meta-dnode use their own object and level, and | |
4732 | * calculate the level 0 equivalent (the first L0 blkid that is contained in the | |
4733 | * blocks this bookmark refers to) by multiplying their blkid by their span | |
4734 | * (the number of L0 blocks contained within one block at their level). | |
4735 | * zbookmarks inside the meta-dnode calculate their object equivalent | |
4736 | * (which is L0equiv * dnodes per data block), use 0 for their L0equiv, and use | |
4737 | * level + 1<<31 (any value larger than a level could ever be) for their level. | |
4738 | * This causes them to always compare before a bookmark in their object | |
4739 | * equivalent, compare appropriately to bookmarks in other objects, and to | |
4740 | * compare appropriately to other bookmarks in the meta-dnode. | |
4741 | */ | |
4742 | int | |
4743 | zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, uint8_t ibs2, | |
4744 | const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2) | |
4745 | { | |
4746 | /* | |
4747 | * These variables represent the "equivalent" values for the zbookmark, | |
4748 | * after converting zbookmarks inside the meta dnode to their | |
4749 | * normal-object equivalents. | |
4750 | */ | |
4751 | uint64_t zb1obj, zb2obj; | |
4752 | uint64_t zb1L0, zb2L0; | |
4753 | uint64_t zb1level, zb2level; | |
4754 | ||
4755 | if (zb1->zb_object == zb2->zb_object && | |
4756 | zb1->zb_level == zb2->zb_level && | |
4757 | zb1->zb_blkid == zb2->zb_blkid) | |
4758 | return (0); | |
9ae529ec | 4759 | |
fcff0f35 PD |
4760 | /* |
4761 | * BP_SPANB calculates the span in blocks. | |
4762 | */ | |
4763 | zb1L0 = (zb1->zb_blkid) * BP_SPANB(ibs1, zb1->zb_level); | |
4764 | zb2L0 = (zb2->zb_blkid) * BP_SPANB(ibs2, zb2->zb_level); | |
9ae529ec CS |
4765 | |
4766 | if (zb1->zb_object == DMU_META_DNODE_OBJECT) { | |
fcff0f35 PD |
4767 | zb1obj = zb1L0 * (dbss1 << (SPA_MINBLOCKSHIFT - DNODE_SHIFT)); |
4768 | zb1L0 = 0; | |
4769 | zb1level = zb1->zb_level + COMPARE_META_LEVEL; | |
4770 | } else { | |
4771 | zb1obj = zb1->zb_object; | |
4772 | zb1level = zb1->zb_level; | |
9ae529ec CS |
4773 | } |
4774 | ||
fcff0f35 PD |
4775 | if (zb2->zb_object == DMU_META_DNODE_OBJECT) { |
4776 | zb2obj = zb2L0 * (dbss2 << (SPA_MINBLOCKSHIFT - DNODE_SHIFT)); | |
4777 | zb2L0 = 0; | |
4778 | zb2level = zb2->zb_level + COMPARE_META_LEVEL; | |
4779 | } else { | |
4780 | zb2obj = zb2->zb_object; | |
4781 | zb2level = zb2->zb_level; | |
4782 | } | |
4783 | ||
4784 | /* Now that we have a canonical representation, do the comparison. */ | |
4785 | if (zb1obj != zb2obj) | |
4786 | return (zb1obj < zb2obj ? -1 : 1); | |
4787 | else if (zb1L0 != zb2L0) | |
4788 | return (zb1L0 < zb2L0 ? -1 : 1); | |
4789 | else if (zb1level != zb2level) | |
4790 | return (zb1level > zb2level ? -1 : 1); | |
4791 | /* | |
4792 | * This can (theoretically) happen if the bookmarks have the same object | |
4793 | * and level, but different blkids, if the block sizes are not the same. | |
4794 | * There is presently no way to change the indirect block sizes | |
4795 | */ | |
4796 | return (0); | |
4797 | } | |
4798 | ||
4799 | /* | |
4800 | * This function checks the following: given that last_block is the place that | |
4801 | * our traversal stopped last time, does that guarantee that we've visited | |
4802 | * every node under subtree_root? Therefore, we can't just use the raw output | |
4803 | * of zbookmark_compare. We have to pass in a modified version of | |
4804 | * subtree_root; by incrementing the block id, and then checking whether | |
4805 | * last_block is before or equal to that, we can tell whether or not having | |
4806 | * visited last_block implies that all of subtree_root's children have been | |
4807 | * visited. | |
4808 | */ | |
4809 | boolean_t | |
4810 | zbookmark_subtree_completed(const dnode_phys_t *dnp, | |
4811 | const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block) | |
4812 | { | |
4813 | zbookmark_phys_t mod_zb = *subtree_root; | |
4814 | mod_zb.zb_blkid++; | |
4815 | ASSERT(last_block->zb_level == 0); | |
4816 | ||
4817 | /* The objset_phys_t isn't before anything. */ | |
4818 | if (dnp == NULL) | |
9ae529ec | 4819 | return (B_FALSE); |
fcff0f35 PD |
4820 | |
4821 | /* | |
4822 | * We pass in 1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT) for the | |
4823 | * data block size in sectors, because that variable is only used if | |
4824 | * the bookmark refers to a block in the meta-dnode. Since we don't | |
4825 | * know without examining it what object it refers to, and there's no | |
4826 | * harm in passing in this value in other cases, we always pass it in. | |
4827 | * | |
4828 | * We pass in 0 for the indirect block size shift because zb2 must be | |
4829 | * level 0. The indirect block size is only used to calculate the span | |
4830 | * of the bookmark, but since the bookmark must be level 0, the span is | |
4831 | * always 1, so the math works out. | |
4832 | * | |
4833 | * If you make changes to how the zbookmark_compare code works, be sure | |
4834 | * to make sure that this code still works afterwards. | |
4835 | */ | |
4836 | return (zbookmark_compare(dnp->dn_datablkszsec, dnp->dn_indblkshift, | |
4837 | 1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT), 0, &mod_zb, | |
4838 | last_block) <= 0); | |
9ae529ec CS |
4839 | } |
4840 | ||
93ce2b4c | 4841 | #if defined(_KERNEL) |
c28b2279 | 4842 | EXPORT_SYMBOL(zio_type_name); |
81971b13 BB |
4843 | EXPORT_SYMBOL(zio_buf_alloc); |
4844 | EXPORT_SYMBOL(zio_data_buf_alloc); | |
4845 | EXPORT_SYMBOL(zio_buf_free); | |
4846 | EXPORT_SYMBOL(zio_data_buf_free); | |
c28b2279 | 4847 | |
ad796b8a TH |
4848 | module_param(zio_slow_io_ms, int, 0644); |
4849 | MODULE_PARM_DESC(zio_slow_io_ms, | |
4850 | "Max I/O completion time (milliseconds) before marking it as slow"); | |
c409e464 BB |
4851 | |
4852 | module_param(zio_requeue_io_start_cut_in_line, int, 0644); | |
4853 | MODULE_PARM_DESC(zio_requeue_io_start_cut_in_line, "Prioritize requeued I/O"); | |
29dee3ee CP |
4854 | |
4855 | module_param(zfs_sync_pass_deferred_free, int, 0644); | |
4856 | MODULE_PARM_DESC(zfs_sync_pass_deferred_free, | |
d1d7e268 | 4857 | "Defer frees starting in this pass"); |
29dee3ee CP |
4858 | |
4859 | module_param(zfs_sync_pass_dont_compress, int, 0644); | |
4860 | MODULE_PARM_DESC(zfs_sync_pass_dont_compress, | |
d1d7e268 | 4861 | "Don't compress starting in this pass"); |
29dee3ee CP |
4862 | |
4863 | module_param(zfs_sync_pass_rewrite, int, 0644); | |
4864 | MODULE_PARM_DESC(zfs_sync_pass_rewrite, | |
d1d7e268 | 4865 | "Rewrite new bps starting in this pass"); |
3dfb57a3 DB |
4866 | |
4867 | module_param(zio_dva_throttle_enabled, int, 0644); | |
4868 | MODULE_PARM_DESC(zio_dva_throttle_enabled, | |
4869 | "Throttle block allocations in the ZIO pipeline"); | |
638dd5f4 TC |
4870 | |
4871 | module_param(zio_deadman_log_all, int, 0644); | |
4872 | MODULE_PARM_DESC(zio_deadman_log_all, | |
4873 | "Log all slow ZIOs, not just those with vdevs"); | |
c28b2279 | 4874 | #endif |