1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 223f9d6ad7SLin Ling * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23f78cdc34SPaul Dagnelie * Copyright (c) 2011, 2018 by Delphix. All rights reserved. 245aeb9474SGarrett D'Amore * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved. 25c3d26abcSMatthew Ahrens * Copyright (c) 2014 Integros [integros.com] 26663207adSDon Brady * Copyright (c) 2017, Intel Corporation. 278548ec78SJohn Levon * Copyright 2020 Joyent, Inc. 28fa9e4066Sahrens */ 29fa9e4066Sahrens 30de710d24SJosef 'Jeff' Sipek #include <sys/sysmacros.h> 31fa9e4066Sahrens #include <sys/zfs_context.h> 32ea8dc4b6Seschrock #include <sys/fm/fs/zfs.h> 33fa9e4066Sahrens #include <sys/spa.h> 34fa9e4066Sahrens #include <sys/txg.h> 35fa9e4066Sahrens #include <sys/spa_impl.h> 36fa9e4066Sahrens #include <sys/vdev_impl.h> 37084fd14fSBrian Behlendorf #include <sys/vdev_trim.h> 38fa9e4066Sahrens #include <sys/zio_impl.h> 39fa9e4066Sahrens #include <sys/zio_compress.h> 40fa9e4066Sahrens #include <sys/zio_checksum.h> 41b24ab676SJeff Bonwick #include <sys/dmu_objset.h> 42b24ab676SJeff Bonwick #include <sys/arc.h> 43b24ab676SJeff Bonwick #include <sys/ddt.h> 445d7b4d43SMatthew Ahrens #include <sys/blkptr.h> 4543466aaeSMax Grossman #include <sys/zfeature.h> 46dd50e0ccSTony Hutter #include <sys/time.h> 47a3874b8bSToomas Soome #include <sys/dsl_scan.h> 480f7643c7SGeorge Wilson #include <sys/metaslab_impl.h> 49770499e1SDan Kimmel #include <sys/abd.h> 50f78cdc34SPaul Dagnelie #include <sys/cityhash.h> 51eb633035STom Caputi #include <sys/dsl_crypt.h> 52*f6ef4223SJoshua M. Clulow #include <sys/stdbool.h> 53fa9e4066Sahrens 54fa9e4066Sahrens /* 55fa9e4066Sahrens * ========================================================================== 56fa9e4066Sahrens * I/O type descriptions 57fa9e4066Sahrens * ========================================================================== 58fa9e4066Sahrens */ 5969962b56SMatthew Ahrens const char *zio_type_name[ZIO_TYPES] = { 6080eb36f2SGeorge Wilson "zio_null", "zio_read", "zio_write", "zio_free", "zio_claim", 61084fd14fSBrian Behlendorf "zio_ioctl", "z_trim" 6280eb36f2SGeorge Wilson }; 63fa9e4066Sahrens 640f7643c7SGeorge Wilson boolean_t zio_dva_throttle_enabled = B_TRUE; 650f7643c7SGeorge Wilson 66fa9e4066Sahrens /* 67fa9e4066Sahrens * ========================================================================== 68fa9e4066Sahrens * I/O kmem caches 69fa9e4066Sahrens * ========================================================================== 70fa9e4066Sahrens */ 71ccae0b50Seschrock kmem_cache_t *zio_cache; 72a3f829aeSBill Moore kmem_cache_t *zio_link_cache; 73fa9e4066Sahrens kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 74ad23a2dbSjohansen kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 75ad23a2dbSjohansen 76ad23a2dbSjohansen #ifdef _KERNEL 77ad23a2dbSjohansen extern vmem_t *zio_alloc_arena; 78ad23a2dbSjohansen #endif 79fa9e4066Sahrens 80738f37bcSGeorge Wilson #define ZIO_PIPELINE_CONTINUE 0x100 81738f37bcSGeorge Wilson #define ZIO_PIPELINE_STOP 0x101 82738f37bcSGeorge Wilson 83dd50e0ccSTony Hutter /* Mark IOs as "slow" if they take longer than 30 seconds */ 84dd50e0ccSTony Hutter int zio_slow_io_ms = (30 * MILLISEC); 85dd50e0ccSTony Hutter 86a2cdcdd2SPaul Dagnelie #define BP_SPANB(indblkshift, level) \ 87a2cdcdd2SPaul Dagnelie (((uint64_t)1) << ((level) * ((indblkshift) - SPA_BLKPTRSHIFT))) 88a2cdcdd2SPaul Dagnelie #define COMPARE_META_LEVEL 0x80000000ul 8901f55e48SGeorge Wilson /* 9001f55e48SGeorge Wilson * The following actions directly effect the spa's sync-to-convergence logic. 9101f55e48SGeorge Wilson * The values below define the sync pass when we start performing the action. 9201f55e48SGeorge Wilson * Care should be taken when changing these values as they directly impact 9301f55e48SGeorge Wilson * spa_sync() performance. Tuning these values may introduce subtle performance 9401f55e48SGeorge Wilson * pathologies and should only be done in the context of performance analysis. 9501f55e48SGeorge Wilson * These tunables will eventually be removed and replaced with #defines once 9601f55e48SGeorge Wilson * enough analysis has been done to determine optimal values. 9701f55e48SGeorge Wilson * 9801f55e48SGeorge Wilson * The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that 9901f55e48SGeorge Wilson * regular blocks are not deferred. 10001f55e48SGeorge Wilson */ 10101f55e48SGeorge Wilson int zfs_sync_pass_deferred_free = 2; /* defer frees starting in this pass */ 10201f55e48SGeorge Wilson int zfs_sync_pass_dont_compress = 5; /* don't compress starting in this pass */ 10301f55e48SGeorge Wilson int zfs_sync_pass_rewrite = 2; /* rewrite new bps starting in this pass */ 10401f55e48SGeorge Wilson 1050a4e9518Sgw /* 106e14bb325SJeff Bonwick * An allocating zio is one that either currently has the DVA allocate 107e14bb325SJeff Bonwick * stage set or will have it later in its lifetime. 1080a4e9518Sgw */ 109b24ab676SJeff Bonwick #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) 110b24ab676SJeff Bonwick 11135a5a358SJonathan Adams boolean_t zio_requeue_io_start_cut_in_line = B_TRUE; 11235a5a358SJonathan Adams 113b24ab676SJeff Bonwick #ifdef ZFS_DEBUG 114b24ab676SJeff Bonwick int zio_buf_debug_limit = 16384; 115b24ab676SJeff Bonwick #else 116b24ab676SJeff Bonwick int zio_buf_debug_limit = 0; 117b24ab676SJeff Bonwick #endif 1180a4e9518Sgw 1190f7643c7SGeorge Wilson static void zio_taskq_dispatch(zio_t *, zio_taskq_type_t, boolean_t); 1200f7643c7SGeorge Wilson 121fa9e4066Sahrens void 122fa9e4066Sahrens zio_init(void) 123fa9e4066Sahrens { 124fa9e4066Sahrens size_t c; 125ad23a2dbSjohansen vmem_t *data_alloc_arena = NULL; 126ad23a2dbSjohansen 127ad23a2dbSjohansen #ifdef _KERNEL 128ad23a2dbSjohansen data_alloc_arena = zio_alloc_arena; 129ad23a2dbSjohansen #endif 130a3f829aeSBill Moore zio_cache = kmem_cache_create("zio_cache", 131a3f829aeSBill Moore sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 132a3f829aeSBill Moore zio_link_cache = kmem_cache_create("zio_link_cache", 133a3f829aeSBill Moore sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 134ccae0b50Seschrock 135fa9e4066Sahrens /* 136fa9e4066Sahrens * For small buffers, we want a cache for each multiple of 137b5152584SMatthew Ahrens * SPA_MINBLOCKSIZE. For larger buffers, we want a cache 138b5152584SMatthew Ahrens * for each quarter-power of 2. 139fa9e4066Sahrens */ 140fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 141fa9e4066Sahrens size_t size = (c + 1) << SPA_MINBLOCKSHIFT; 142fa9e4066Sahrens size_t p2 = size; 143fa9e4066Sahrens size_t align = 0; 144e291592aSJonathan Adams size_t cflags = (size > zio_buf_debug_limit) ? KMC_NODEBUG : 0; 145fa9e4066Sahrens 146de710d24SJosef 'Jeff' Sipek while (!ISP2(p2)) 147fa9e4066Sahrens p2 &= p2 - 1; 148fa9e4066Sahrens 149cd1c8b85SMatthew Ahrens #ifndef _KERNEL 150cd1c8b85SMatthew Ahrens /* 151cd1c8b85SMatthew Ahrens * If we are using watchpoints, put each buffer on its own page, 152cd1c8b85SMatthew Ahrens * to eliminate the performance overhead of trapping to the 153cd1c8b85SMatthew Ahrens * kernel when modifying a non-watched buffer that shares the 154cd1c8b85SMatthew Ahrens * page with a watched buffer. 155cd1c8b85SMatthew Ahrens */ 156cd1c8b85SMatthew Ahrens if (arc_watch && !IS_P2ALIGNED(size, PAGESIZE)) 157cd1c8b85SMatthew Ahrens continue; 158cd1c8b85SMatthew Ahrens #endif 159fa9e4066Sahrens if (size <= 4 * SPA_MINBLOCKSIZE) { 160fa9e4066Sahrens align = SPA_MINBLOCKSIZE; 161cd1c8b85SMatthew Ahrens } else if (IS_P2ALIGNED(size, p2 >> 2)) { 162b5152584SMatthew Ahrens align = MIN(p2 >> 2, PAGESIZE); 163fa9e4066Sahrens } 164fa9e4066Sahrens 165fa9e4066Sahrens if (align != 0) { 166ad23a2dbSjohansen char name[36]; 1675ad82045Snd (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); 168fa9e4066Sahrens zio_buf_cache[c] = kmem_cache_create(name, size, 169e291592aSJonathan Adams align, NULL, NULL, NULL, NULL, NULL, cflags); 170ad23a2dbSjohansen 171e291592aSJonathan Adams /* 172e291592aSJonathan Adams * Since zio_data bufs do not appear in crash dumps, we 173e291592aSJonathan Adams * pass KMC_NOTOUCH so that no allocator metadata is 174e291592aSJonathan Adams * stored with the buffers. 175e291592aSJonathan Adams */ 176ad23a2dbSjohansen (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); 177ad23a2dbSjohansen zio_data_buf_cache[c] = kmem_cache_create(name, size, 178ad23a2dbSjohansen align, NULL, NULL, NULL, NULL, data_alloc_arena, 179e291592aSJonathan Adams cflags | KMC_NOTOUCH); 180fa9e4066Sahrens } 181fa9e4066Sahrens } 182fa9e4066Sahrens 183fa9e4066Sahrens while (--c != 0) { 184fa9e4066Sahrens ASSERT(zio_buf_cache[c] != NULL); 185fa9e4066Sahrens if (zio_buf_cache[c - 1] == NULL) 186fa9e4066Sahrens zio_buf_cache[c - 1] = zio_buf_cache[c]; 187ad23a2dbSjohansen 188ad23a2dbSjohansen ASSERT(zio_data_buf_cache[c] != NULL); 189ad23a2dbSjohansen if (zio_data_buf_cache[c - 1] == NULL) 190ad23a2dbSjohansen zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; 191fa9e4066Sahrens } 192ea8dc4b6Seschrock 193ea8dc4b6Seschrock zio_inject_init(); 194fa9e4066Sahrens } 195fa9e4066Sahrens 196fa9e4066Sahrens void 197fa9e4066Sahrens zio_fini(void) 198fa9e4066Sahrens { 199fa9e4066Sahrens size_t c; 200fa9e4066Sahrens kmem_cache_t *last_cache = NULL; 201ad23a2dbSjohansen kmem_cache_t *last_data_cache = NULL; 202fa9e4066Sahrens 203fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 204fa9e4066Sahrens if (zio_buf_cache[c] != last_cache) { 205fa9e4066Sahrens last_cache = zio_buf_cache[c]; 206fa9e4066Sahrens kmem_cache_destroy(zio_buf_cache[c]); 207fa9e4066Sahrens } 208fa9e4066Sahrens zio_buf_cache[c] = NULL; 209ad23a2dbSjohansen 210ad23a2dbSjohansen if (zio_data_buf_cache[c] != last_data_cache) { 211ad23a2dbSjohansen last_data_cache = zio_data_buf_cache[c]; 212ad23a2dbSjohansen kmem_cache_destroy(zio_data_buf_cache[c]); 213ad23a2dbSjohansen } 214ad23a2dbSjohansen zio_data_buf_cache[c] = NULL; 215fa9e4066Sahrens } 216ea8dc4b6Seschrock 217a3f829aeSBill Moore kmem_cache_destroy(zio_link_cache); 218ccae0b50Seschrock kmem_cache_destroy(zio_cache); 219ccae0b50Seschrock 220ea8dc4b6Seschrock zio_inject_fini(); 221fa9e4066Sahrens } 222fa9e4066Sahrens 223fa9e4066Sahrens /* 224fa9e4066Sahrens * ========================================================================== 225fa9e4066Sahrens * Allocate and free I/O buffers 226fa9e4066Sahrens * ========================================================================== 227fa9e4066Sahrens */ 228ad23a2dbSjohansen 229ad23a2dbSjohansen /* 230ad23a2dbSjohansen * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a 231ad23a2dbSjohansen * crashdump if the kernel panics, so use it judiciously. Obviously, it's 232ad23a2dbSjohansen * useful to inspect ZFS metadata, but if possible, we should avoid keeping 233ad23a2dbSjohansen * excess / transient data in-core during a crashdump. 234ad23a2dbSjohansen */ 235fa9e4066Sahrens void * 236fa9e4066Sahrens zio_buf_alloc(size_t size) 237fa9e4066Sahrens { 238fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 239fa9e4066Sahrens 240f63ab3d5SMatthew Ahrens VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 241fa9e4066Sahrens 2421ab7f2deSmaybee return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); 243fa9e4066Sahrens } 244fa9e4066Sahrens 245ad23a2dbSjohansen /* 246ad23a2dbSjohansen * Use zio_data_buf_alloc to allocate data. The data will not appear in a 247ad23a2dbSjohansen * crashdump if the kernel panics. This exists so that we will limit the amount 248ad23a2dbSjohansen * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount 249ad23a2dbSjohansen * of kernel heap dumped to disk when the kernel panics) 250ad23a2dbSjohansen */ 251ad23a2dbSjohansen void * 252ad23a2dbSjohansen zio_data_buf_alloc(size_t size) 253ad23a2dbSjohansen { 254ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 255ad23a2dbSjohansen 256f63ab3d5SMatthew Ahrens VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 257ad23a2dbSjohansen 2581ab7f2deSmaybee return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); 259ad23a2dbSjohansen } 260ad23a2dbSjohansen 261fa9e4066Sahrens void 262fa9e4066Sahrens zio_buf_free(void *buf, size_t size) 263fa9e4066Sahrens { 264fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 265fa9e4066Sahrens 266f63ab3d5SMatthew Ahrens VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 267fa9e4066Sahrens 268fa9e4066Sahrens kmem_cache_free(zio_buf_cache[c], buf); 269fa9e4066Sahrens } 270fa9e4066Sahrens 271ad23a2dbSjohansen void 272ad23a2dbSjohansen zio_data_buf_free(void *buf, size_t size) 273ad23a2dbSjohansen { 274ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 275ad23a2dbSjohansen 276f63ab3d5SMatthew Ahrens VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 277ad23a2dbSjohansen 278ad23a2dbSjohansen kmem_cache_free(zio_data_buf_cache[c], buf); 279ad23a2dbSjohansen } 280b3995adbSahrens 281eb633035STom Caputi /* ARGSUSED */ 282eb633035STom Caputi static void 283eb633035STom Caputi zio_abd_free(void *abd, size_t size) 284eb633035STom Caputi { 285eb633035STom Caputi abd_free((abd_t *)abd); 286eb633035STom Caputi } 287eb633035STom Caputi 288fa9e4066Sahrens /* 289fa9e4066Sahrens * ========================================================================== 290fa9e4066Sahrens * Push and pop I/O transform buffers 291fa9e4066Sahrens * ========================================================================== 292fa9e4066Sahrens */ 293dcbf3bd6SGeorge Wilson void 294770499e1SDan Kimmel zio_push_transform(zio_t *zio, abd_t *data, uint64_t size, uint64_t bufsize, 2959a686fbcSPaul Dagnelie zio_transform_func_t *transform) 296fa9e4066Sahrens { 297fa9e4066Sahrens zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); 298fa9e4066Sahrens 299770499e1SDan Kimmel /* 300770499e1SDan Kimmel * Ensure that anyone expecting this zio to contain a linear ABD isn't 301770499e1SDan Kimmel * going to get a nasty surprise when they try to access the data. 302770499e1SDan Kimmel */ 303770499e1SDan Kimmel IMPLY(abd_is_linear(zio->io_abd), abd_is_linear(data)); 304770499e1SDan Kimmel 305770499e1SDan Kimmel zt->zt_orig_abd = zio->io_abd; 306e14bb325SJeff Bonwick zt->zt_orig_size = zio->io_size; 307fa9e4066Sahrens zt->zt_bufsize = bufsize; 308e14bb325SJeff Bonwick zt->zt_transform = transform; 309fa9e4066Sahrens 310fa9e4066Sahrens zt->zt_next = zio->io_transform_stack; 311fa9e4066Sahrens zio->io_transform_stack = zt; 312fa9e4066Sahrens 313770499e1SDan Kimmel zio->io_abd = data; 314fa9e4066Sahrens zio->io_size = size; 315fa9e4066Sahrens } 316fa9e4066Sahrens 317dcbf3bd6SGeorge Wilson void 318e14bb325SJeff Bonwick zio_pop_transforms(zio_t *zio) 319fa9e4066Sahrens { 320e14bb325SJeff Bonwick zio_transform_t *zt; 321e14bb325SJeff Bonwick 322e14bb325SJeff Bonwick while ((zt = zio->io_transform_stack) != NULL) { 323e14bb325SJeff Bonwick if (zt->zt_transform != NULL) 324e14bb325SJeff Bonwick zt->zt_transform(zio, 325770499e1SDan Kimmel zt->zt_orig_abd, zt->zt_orig_size); 326fa9e4066Sahrens 327b24ab676SJeff Bonwick if (zt->zt_bufsize != 0) 328770499e1SDan Kimmel abd_free(zio->io_abd); 329fa9e4066Sahrens 330770499e1SDan Kimmel zio->io_abd = zt->zt_orig_abd; 331e14bb325SJeff Bonwick zio->io_size = zt->zt_orig_size; 332e14bb325SJeff Bonwick zio->io_transform_stack = zt->zt_next; 333fa9e4066Sahrens 334e14bb325SJeff Bonwick kmem_free(zt, sizeof (zio_transform_t)); 335fa9e4066Sahrens } 336fa9e4066Sahrens } 337fa9e4066Sahrens 338e14bb325SJeff Bonwick /* 339e14bb325SJeff Bonwick * ========================================================================== 340eb633035STom Caputi * I/O transform callbacks for subblocks, decompression, and decryption 341e14bb325SJeff Bonwick * ========================================================================== 342e14bb325SJeff Bonwick */ 343e14bb325SJeff Bonwick static void 344770499e1SDan Kimmel zio_subblock(zio_t *zio, abd_t *data, uint64_t size) 345e14bb325SJeff Bonwick { 346e14bb325SJeff Bonwick ASSERT(zio->io_size > size); 347e14bb325SJeff Bonwick 348e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ) 349770499e1SDan Kimmel abd_copy(data, zio->io_abd, size); 350e14bb325SJeff Bonwick } 351e14bb325SJeff Bonwick 352e14bb325SJeff Bonwick static void 353770499e1SDan Kimmel zio_decompress(zio_t *zio, abd_t *data, uint64_t size) 354e14bb325SJeff Bonwick { 355770499e1SDan Kimmel if (zio->io_error == 0) { 356770499e1SDan Kimmel void *tmp = abd_borrow_buf(data, size); 357770499e1SDan Kimmel int ret = zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), 358770499e1SDan Kimmel zio->io_abd, tmp, zio->io_size, size); 359770499e1SDan Kimmel abd_return_buf_copy(data, tmp, size); 360770499e1SDan Kimmel 361770499e1SDan Kimmel if (ret != 0) 362770499e1SDan Kimmel zio->io_error = SET_ERROR(EIO); 363770499e1SDan Kimmel } 364e14bb325SJeff Bonwick } 365e14bb325SJeff Bonwick 366eb633035STom Caputi static void 367eb633035STom Caputi zio_decrypt(zio_t *zio, abd_t *data, uint64_t size) 368eb633035STom Caputi { 369eb633035STom Caputi int ret; 370eb633035STom Caputi void *tmp; 371eb633035STom Caputi blkptr_t *bp = zio->io_bp; 372eb633035STom Caputi spa_t *spa = zio->io_spa; 373eb633035STom Caputi uint64_t dsobj = zio->io_bookmark.zb_objset; 374eb633035STom Caputi uint64_t lsize = BP_GET_LSIZE(bp); 375eb633035STom Caputi dmu_object_type_t ot = BP_GET_TYPE(bp); 376eb633035STom Caputi uint8_t salt[ZIO_DATA_SALT_LEN]; 377eb633035STom Caputi uint8_t iv[ZIO_DATA_IV_LEN]; 378eb633035STom Caputi uint8_t mac[ZIO_DATA_MAC_LEN]; 379eb633035STom Caputi boolean_t no_crypt = B_FALSE; 380eb633035STom Caputi 381eb633035STom Caputi ASSERT(BP_USES_CRYPT(bp)); 382eb633035STom Caputi ASSERT3U(size, !=, 0); 383eb633035STom Caputi 384eb633035STom Caputi if (zio->io_error != 0) 385eb633035STom Caputi return; 386eb633035STom Caputi 387eb633035STom Caputi /* 388eb633035STom Caputi * Verify the cksum of MACs stored in an indirect bp. It will always 389eb633035STom Caputi * be possible to verify this since it does not require an encryption 390eb633035STom Caputi * key. 391eb633035STom Caputi */ 392eb633035STom Caputi if (BP_HAS_INDIRECT_MAC_CKSUM(bp)) { 393eb633035STom Caputi zio_crypt_decode_mac_bp(bp, mac); 394eb633035STom Caputi 395eb633035STom Caputi if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF) { 396eb633035STom Caputi /* 397eb633035STom Caputi * We haven't decompressed the data yet, but 398eb633035STom Caputi * zio_crypt_do_indirect_mac_checksum() requires 399eb633035STom Caputi * decompressed data to be able to parse out the MACs 400eb633035STom Caputi * from the indirect block. We decompress it now and 401eb633035STom Caputi * throw away the result after we are finished. 402eb633035STom Caputi */ 403eb633035STom Caputi tmp = zio_buf_alloc(lsize); 404eb633035STom Caputi ret = zio_decompress_data(BP_GET_COMPRESS(bp), 405eb633035STom Caputi zio->io_abd, tmp, zio->io_size, lsize); 406eb633035STom Caputi if (ret != 0) { 407eb633035STom Caputi ret = SET_ERROR(EIO); 408eb633035STom Caputi goto error; 409eb633035STom Caputi } 410eb633035STom Caputi ret = zio_crypt_do_indirect_mac_checksum(B_FALSE, 411eb633035STom Caputi tmp, lsize, BP_SHOULD_BYTESWAP(bp), mac); 412eb633035STom Caputi zio_buf_free(tmp, lsize); 413eb633035STom Caputi } else { 414eb633035STom Caputi ret = zio_crypt_do_indirect_mac_checksum_abd(B_FALSE, 415eb633035STom Caputi zio->io_abd, size, BP_SHOULD_BYTESWAP(bp), mac); 416eb633035STom Caputi } 417eb633035STom Caputi abd_copy(data, zio->io_abd, size); 418eb633035STom Caputi 419eb633035STom Caputi if (ret != 0) 420eb633035STom Caputi goto error; 421eb633035STom Caputi 422eb633035STom Caputi return; 423eb633035STom Caputi } 424eb633035STom Caputi 425eb633035STom Caputi /* 426eb633035STom Caputi * If this is an authenticated block, just check the MAC. It would be 427eb633035STom Caputi * nice to separate this out into its own flag, but for the moment 428eb633035STom Caputi * enum zio_flag is out of bits. 429eb633035STom Caputi */ 430eb633035STom Caputi if (BP_IS_AUTHENTICATED(bp)) { 431eb633035STom Caputi if (ot == DMU_OT_OBJSET) { 432eb633035STom Caputi ret = spa_do_crypt_objset_mac_abd(B_FALSE, spa, 433eb633035STom Caputi dsobj, zio->io_abd, size, BP_SHOULD_BYTESWAP(bp)); 434eb633035STom Caputi } else { 435eb633035STom Caputi zio_crypt_decode_mac_bp(bp, mac); 436eb633035STom Caputi ret = spa_do_crypt_mac_abd(B_FALSE, spa, dsobj, 437eb633035STom Caputi zio->io_abd, size, mac); 438eb633035STom Caputi } 439eb633035STom Caputi abd_copy(data, zio->io_abd, size); 440eb633035STom Caputi 441eb633035STom Caputi if (zio_injection_enabled && ot != DMU_OT_DNODE && ret == 0) { 442eb633035STom Caputi ret = zio_handle_decrypt_injection(spa, 443eb633035STom Caputi &zio->io_bookmark, ot, ECKSUM); 444eb633035STom Caputi } 445eb633035STom Caputi if (ret != 0) 446eb633035STom Caputi goto error; 447eb633035STom Caputi 448eb633035STom Caputi return; 449eb633035STom Caputi } 450eb633035STom Caputi 451eb633035STom Caputi zio_crypt_decode_params_bp(bp, salt, iv); 452eb633035STom Caputi 453eb633035STom Caputi if (ot == DMU_OT_INTENT_LOG) { 454eb633035STom Caputi tmp = abd_borrow_buf_copy(zio->io_abd, sizeof (zil_chain_t)); 455eb633035STom Caputi zio_crypt_decode_mac_zil(tmp, mac); 456eb633035STom Caputi abd_return_buf(zio->io_abd, tmp, sizeof (zil_chain_t)); 457eb633035STom Caputi } else { 458eb633035STom Caputi zio_crypt_decode_mac_bp(bp, mac); 459eb633035STom Caputi } 460eb633035STom Caputi 461eb633035STom Caputi ret = spa_do_crypt_abd(B_FALSE, spa, &zio->io_bookmark, BP_GET_TYPE(bp), 462eb633035STom Caputi BP_GET_DEDUP(bp), BP_SHOULD_BYTESWAP(bp), salt, iv, mac, size, data, 463eb633035STom Caputi zio->io_abd, &no_crypt); 464eb633035STom Caputi if (no_crypt) 465eb633035STom Caputi abd_copy(data, zio->io_abd, size); 466eb633035STom Caputi 467eb633035STom Caputi if (ret != 0) 468eb633035STom Caputi goto error; 469eb633035STom Caputi 470eb633035STom Caputi return; 471eb633035STom Caputi 472eb633035STom Caputi error: 473eb633035STom Caputi /* assert that the key was found unless this was speculative */ 474eb633035STom Caputi ASSERT(ret != EACCES || (zio->io_flags & ZIO_FLAG_SPECULATIVE)); 475eb633035STom Caputi 476eb633035STom Caputi /* 477eb633035STom Caputi * If there was a decryption / authentication error return EIO as 478eb633035STom Caputi * the io_error. If this was not a speculative zio, create an ereport. 479eb633035STom Caputi */ 480eb633035STom Caputi if (ret == ECKSUM) { 481eb633035STom Caputi zio->io_error = SET_ERROR(EIO); 482eb633035STom Caputi if ((zio->io_flags & ZIO_FLAG_SPECULATIVE) == 0) { 483eb633035STom Caputi spa_log_error(spa, &zio->io_bookmark); 4849b088140SToomas Soome (void) zfs_ereport_post(FM_EREPORT_ZFS_AUTHENTICATION, 485eb633035STom Caputi spa, NULL, &zio->io_bookmark, zio, 0, 0); 486eb633035STom Caputi } 487eb633035STom Caputi } else { 488eb633035STom Caputi zio->io_error = ret; 489eb633035STom Caputi } 490eb633035STom Caputi } 491eb633035STom Caputi 492e14bb325SJeff Bonwick /* 493e14bb325SJeff Bonwick * ========================================================================== 494e14bb325SJeff Bonwick * I/O parent/child relationships and pipeline interlocks 495e14bb325SJeff Bonwick * ========================================================================== 496e14bb325SJeff Bonwick */ 497a3f829aeSBill Moore zio_t * 4980f7643c7SGeorge Wilson zio_walk_parents(zio_t *cio, zio_link_t **zl) 499a3f829aeSBill Moore { 500a3f829aeSBill Moore list_t *pl = &cio->io_parent_list; 501e14bb325SJeff Bonwick 5020f7643c7SGeorge Wilson *zl = (*zl == NULL) ? list_head(pl) : list_next(pl, *zl); 5030f7643c7SGeorge Wilson if (*zl == NULL) 504a3f829aeSBill Moore return (NULL); 505a3f829aeSBill Moore 5060f7643c7SGeorge Wilson ASSERT((*zl)->zl_child == cio); 5070f7643c7SGeorge Wilson return ((*zl)->zl_parent); 508a3f829aeSBill Moore } 509a3f829aeSBill Moore 510a3f829aeSBill Moore zio_t * 5110f7643c7SGeorge Wilson zio_walk_children(zio_t *pio, zio_link_t **zl) 512a3f829aeSBill Moore { 513a3f829aeSBill Moore list_t *cl = &pio->io_child_list; 514a3f829aeSBill Moore 515a3874b8bSToomas Soome ASSERT(MUTEX_HELD(&pio->io_lock)); 516a3874b8bSToomas Soome 5170f7643c7SGeorge Wilson *zl = (*zl == NULL) ? list_head(cl) : list_next(cl, *zl); 5180f7643c7SGeorge Wilson if (*zl == NULL) 519a3f829aeSBill Moore return (NULL); 520a3f829aeSBill Moore 5210f7643c7SGeorge Wilson ASSERT((*zl)->zl_parent == pio); 5220f7643c7SGeorge Wilson return ((*zl)->zl_child); 523a3f829aeSBill Moore } 524a3f829aeSBill Moore 525a3f829aeSBill Moore zio_t * 526a3f829aeSBill Moore zio_unique_parent(zio_t *cio) 527a3f829aeSBill Moore { 5280f7643c7SGeorge Wilson zio_link_t *zl = NULL; 5290f7643c7SGeorge Wilson zio_t *pio = zio_walk_parents(cio, &zl); 530a3f829aeSBill Moore 5310f7643c7SGeorge Wilson VERIFY3P(zio_walk_parents(cio, &zl), ==, NULL); 532a3f829aeSBill Moore return (pio); 533a3f829aeSBill Moore } 534a3f829aeSBill Moore 535a3f829aeSBill Moore void 536a3f829aeSBill Moore zio_add_child(zio_t *pio, zio_t *cio) 537e14bb325SJeff Bonwick { 538a3f829aeSBill Moore zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); 539a3f829aeSBill Moore 540a3f829aeSBill Moore /* 541a3f829aeSBill Moore * Logical I/Os can have logical, gang, or vdev children. 542a3f829aeSBill Moore * Gang I/Os can have gang or vdev children. 543a3f829aeSBill Moore * Vdev I/Os can only have vdev children. 544a3f829aeSBill Moore * The following ASSERT captures all of these constraints. 545a3f829aeSBill Moore */ 5461271e4b1SPrakash Surya ASSERT3S(cio->io_child_type, <=, pio->io_child_type); 547a3f829aeSBill Moore 548a3f829aeSBill Moore zl->zl_parent = pio; 549a3f829aeSBill Moore zl->zl_child = cio; 550a3f829aeSBill Moore 551e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 552a3874b8bSToomas Soome mutex_enter(&cio->io_lock); 553a3f829aeSBill Moore 554a3f829aeSBill Moore ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); 555a3f829aeSBill Moore 556a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 557a3f829aeSBill Moore pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; 558a3f829aeSBill Moore 559a3f829aeSBill Moore list_insert_head(&pio->io_child_list, zl); 560a3f829aeSBill Moore list_insert_head(&cio->io_parent_list, zl); 561a3f829aeSBill Moore 562b24ab676SJeff Bonwick pio->io_child_count++; 563b24ab676SJeff Bonwick cio->io_parent_count++; 564b24ab676SJeff Bonwick 565a3f829aeSBill Moore mutex_exit(&cio->io_lock); 566a3874b8bSToomas Soome mutex_exit(&pio->io_lock); 567e14bb325SJeff Bonwick } 568e14bb325SJeff Bonwick 569fa9e4066Sahrens static void 570a3f829aeSBill Moore zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) 571e14bb325SJeff Bonwick { 572a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 573a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 574e14bb325SJeff Bonwick 575e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 576a3874b8bSToomas Soome mutex_enter(&cio->io_lock); 577a3f829aeSBill Moore 578a3f829aeSBill Moore list_remove(&pio->io_child_list, zl); 579a3f829aeSBill Moore list_remove(&cio->io_parent_list, zl); 580a3f829aeSBill Moore 581b24ab676SJeff Bonwick pio->io_child_count--; 582b24ab676SJeff Bonwick cio->io_parent_count--; 583b24ab676SJeff Bonwick 584a3f829aeSBill Moore mutex_exit(&cio->io_lock); 585a3874b8bSToomas Soome mutex_exit(&pio->io_lock); 586a3f829aeSBill Moore 587a3f829aeSBill Moore kmem_cache_free(zio_link_cache, zl); 588e14bb325SJeff Bonwick } 589e14bb325SJeff Bonwick 590e14bb325SJeff Bonwick static boolean_t 591d6e1c446SGeorge Wilson zio_wait_for_children(zio_t *zio, uint8_t childbits, enum zio_wait_type wait) 592fa9e4066Sahrens { 593e14bb325SJeff Bonwick boolean_t waiting = B_FALSE; 594e14bb325SJeff Bonwick 595e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 596e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 597d6e1c446SGeorge Wilson for (int c = 0; c < ZIO_CHILD_TYPES; c++) { 598d6e1c446SGeorge Wilson if (!(ZIO_CHILD_BIT_IS_SET(childbits, c))) 599d6e1c446SGeorge Wilson continue; 600d6e1c446SGeorge Wilson 601d6e1c446SGeorge Wilson uint64_t *countp = &zio->io_children[c][wait]; 602d6e1c446SGeorge Wilson if (*countp != 0) { 603d6e1c446SGeorge Wilson zio->io_stage >>= 1; 604d6e1c446SGeorge Wilson ASSERT3U(zio->io_stage, !=, ZIO_STAGE_OPEN); 605d6e1c446SGeorge Wilson zio->io_stall = countp; 606d6e1c446SGeorge Wilson waiting = B_TRUE; 607d6e1c446SGeorge Wilson break; 608d6e1c446SGeorge Wilson } 609e14bb325SJeff Bonwick } 610e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 611e14bb325SJeff Bonwick return (waiting); 612e14bb325SJeff Bonwick } 613fa9e4066Sahrens 614e14bb325SJeff Bonwick static void 615e14bb325SJeff Bonwick zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) 616e14bb325SJeff Bonwick { 617e14bb325SJeff Bonwick uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; 618e14bb325SJeff Bonwick int *errorp = &pio->io_child_error[zio->io_child_type]; 619fa9e4066Sahrens 620e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 621e14bb325SJeff Bonwick if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 622e14bb325SJeff Bonwick *errorp = zio_worst_error(*errorp, zio->io_error); 623e14bb325SJeff Bonwick pio->io_reexecute |= zio->io_reexecute; 624e14bb325SJeff Bonwick ASSERT3U(*countp, >, 0); 62569962b56SMatthew Ahrens 62669962b56SMatthew Ahrens (*countp)--; 62769962b56SMatthew Ahrens 62869962b56SMatthew Ahrens if (*countp == 0 && pio->io_stall == countp) { 6290f7643c7SGeorge Wilson zio_taskq_type_t type = 6300f7643c7SGeorge Wilson pio->io_stage < ZIO_STAGE_VDEV_IO_START ? ZIO_TASKQ_ISSUE : 6310f7643c7SGeorge Wilson ZIO_TASKQ_INTERRUPT; 632e14bb325SJeff Bonwick pio->io_stall = NULL; 633e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 6340f7643c7SGeorge Wilson /* 6350f7643c7SGeorge Wilson * Dispatch the parent zio in its own taskq so that 6360f7643c7SGeorge Wilson * the child can continue to make progress. This also 6370f7643c7SGeorge Wilson * prevents overflowing the stack when we have deeply nested 6380f7643c7SGeorge Wilson * parent-child relationships. 6390f7643c7SGeorge Wilson */ 6400f7643c7SGeorge Wilson zio_taskq_dispatch(pio, type, B_FALSE); 641e14bb325SJeff Bonwick } else { 642e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 643fa9e4066Sahrens } 644fa9e4066Sahrens } 645fa9e4066Sahrens 646e14bb325SJeff Bonwick static void 647e14bb325SJeff Bonwick zio_inherit_child_errors(zio_t *zio, enum zio_child c) 648e14bb325SJeff Bonwick { 649e14bb325SJeff Bonwick if (zio->io_child_error[c] != 0 && zio->io_error == 0) 650e14bb325SJeff Bonwick zio->io_error = zio->io_child_error[c]; 651e14bb325SJeff Bonwick } 652e14bb325SJeff Bonwick 6530f7643c7SGeorge Wilson int 65494c2d0ebSMatthew Ahrens zio_bookmark_compare(const void *x1, const void *x2) 6550f7643c7SGeorge Wilson { 6560f7643c7SGeorge Wilson const zio_t *z1 = x1; 6570f7643c7SGeorge Wilson const zio_t *z2 = x2; 6580f7643c7SGeorge Wilson 65994c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_objset < z2->io_bookmark.zb_objset) 6600f7643c7SGeorge Wilson return (-1); 66194c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_objset > z2->io_bookmark.zb_objset) 6620f7643c7SGeorge Wilson return (1); 6630f7643c7SGeorge Wilson 66494c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_object < z2->io_bookmark.zb_object) 6650f7643c7SGeorge Wilson return (-1); 66694c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_object > z2->io_bookmark.zb_object) 66794c2d0ebSMatthew Ahrens return (1); 66894c2d0ebSMatthew Ahrens 66994c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_level < z2->io_bookmark.zb_level) 67094c2d0ebSMatthew Ahrens return (-1); 67194c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_level > z2->io_bookmark.zb_level) 67294c2d0ebSMatthew Ahrens return (1); 67394c2d0ebSMatthew Ahrens 67494c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_blkid < z2->io_bookmark.zb_blkid) 67594c2d0ebSMatthew Ahrens return (-1); 67694c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_blkid > z2->io_bookmark.zb_blkid) 6770f7643c7SGeorge Wilson return (1); 6780f7643c7SGeorge Wilson 6790f7643c7SGeorge Wilson if (z1 < z2) 6800f7643c7SGeorge Wilson return (-1); 6810f7643c7SGeorge Wilson if (z1 > z2) 6820f7643c7SGeorge Wilson return (1); 6830f7643c7SGeorge Wilson 6840f7643c7SGeorge Wilson return (0); 6850f7643c7SGeorge Wilson } 6860f7643c7SGeorge Wilson 687fa9e4066Sahrens /* 688fa9e4066Sahrens * ========================================================================== 689e14bb325SJeff Bonwick * Create the various types of I/O (read, write, free, etc) 690fa9e4066Sahrens * ========================================================================== 691fa9e4066Sahrens */ 692fa9e4066Sahrens static zio_t * 693b24ab676SJeff Bonwick zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 694770499e1SDan Kimmel abd_t *data, uint64_t lsize, uint64_t psize, zio_done_func_t *done, 6955602294fSDan Kimmel void *private, zio_type_t type, zio_priority_t priority, 6965602294fSDan Kimmel enum zio_flag flags, vdev_t *vd, uint64_t offset, 6975602294fSDan Kimmel const zbookmark_phys_t *zb, enum zio_stage stage, enum zio_stage pipeline) 698fa9e4066Sahrens { 699fa9e4066Sahrens zio_t *zio; 700fa9e4066Sahrens 701084fd14fSBrian Behlendorf IMPLY(type != ZIO_TYPE_TRIM, psize <= SPA_MAXBLOCKSIZE); 7025602294fSDan Kimmel ASSERT(P2PHASE(psize, SPA_MINBLOCKSIZE) == 0); 703e14bb325SJeff Bonwick ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); 704fa9e4066Sahrens 705e14bb325SJeff Bonwick ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); 706e14bb325SJeff Bonwick ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); 707e14bb325SJeff Bonwick ASSERT(vd || stage == ZIO_STAGE_OPEN); 708088f3894Sahrens 709eb633035STom Caputi IMPLY(lsize != psize, (flags & ZIO_FLAG_RAW_COMPRESS) != 0); 7105602294fSDan Kimmel 711ccae0b50Seschrock zio = kmem_cache_alloc(zio_cache, KM_SLEEP); 712ccae0b50Seschrock bzero(zio, sizeof (zio_t)); 713e14bb325SJeff Bonwick 714e14bb325SJeff Bonwick mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); 715e14bb325SJeff Bonwick cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); 716e14bb325SJeff Bonwick 717a3f829aeSBill Moore list_create(&zio->io_parent_list, sizeof (zio_link_t), 718a3f829aeSBill Moore offsetof(zio_link_t, zl_parent_node)); 719a3f829aeSBill Moore list_create(&zio->io_child_list, sizeof (zio_link_t), 720a3f829aeSBill Moore offsetof(zio_link_t, zl_child_node)); 7218363e80aSGeorge Wilson metaslab_trace_init(&zio->io_alloc_list); 722a3f829aeSBill Moore 723e14bb325SJeff Bonwick if (vd != NULL) 724e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_VDEV; 725e14bb325SJeff Bonwick else if (flags & ZIO_FLAG_GANG_CHILD) 726e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_GANG; 727b24ab676SJeff Bonwick else if (flags & ZIO_FLAG_DDT_CHILD) 728b24ab676SJeff Bonwick zio->io_child_type = ZIO_CHILD_DDT; 729e14bb325SJeff Bonwick else 730e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_LOGICAL; 731e14bb325SJeff Bonwick 732fa9e4066Sahrens if (bp != NULL) { 733b24ab676SJeff Bonwick zio->io_bp = (blkptr_t *)bp; 734fa9e4066Sahrens zio->io_bp_copy = *bp; 735fa9e4066Sahrens zio->io_bp_orig = *bp; 736b24ab676SJeff Bonwick if (type != ZIO_TYPE_WRITE || 737b24ab676SJeff Bonwick zio->io_child_type == ZIO_CHILD_DDT) 738e14bb325SJeff Bonwick zio->io_bp = &zio->io_bp_copy; /* so caller can free */ 739f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL) 740e14bb325SJeff Bonwick zio->io_logical = zio; 741f5383399SBill Moore if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) 742f5383399SBill Moore pipeline |= ZIO_GANG_STAGES; 743fa9e4066Sahrens } 744e14bb325SJeff Bonwick 745e14bb325SJeff Bonwick zio->io_spa = spa; 746e14bb325SJeff Bonwick zio->io_txg = txg; 747fa9e4066Sahrens zio->io_done = done; 748fa9e4066Sahrens zio->io_private = private; 749fa9e4066Sahrens zio->io_type = type; 750fa9e4066Sahrens zio->io_priority = priority; 751e14bb325SJeff Bonwick zio->io_vd = vd; 752e14bb325SJeff Bonwick zio->io_offset = offset; 753770499e1SDan Kimmel zio->io_orig_abd = zio->io_abd = data; 7545602294fSDan Kimmel zio->io_orig_size = zio->io_size = psize; 7555602294fSDan Kimmel zio->io_lsize = lsize; 756e14bb325SJeff Bonwick zio->io_orig_flags = zio->io_flags = flags; 757e14bb325SJeff Bonwick zio->io_orig_stage = zio->io_stage = stage; 758e14bb325SJeff Bonwick zio->io_orig_pipeline = zio->io_pipeline = pipeline; 7590f7643c7SGeorge Wilson zio->io_pipeline_trace = ZIO_STAGE_OPEN; 760fa9e4066Sahrens 761a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); 762a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); 763a3f829aeSBill Moore 764e14bb325SJeff Bonwick if (zb != NULL) 765e14bb325SJeff Bonwick zio->io_bookmark = *zb; 766e14bb325SJeff Bonwick 767e14bb325SJeff Bonwick if (pio != NULL) { 768663207adSDon Brady if (zio->io_metaslab_class == NULL) 769663207adSDon Brady zio->io_metaslab_class = pio->io_metaslab_class; 770e14bb325SJeff Bonwick if (zio->io_logical == NULL) 771ea8dc4b6Seschrock zio->io_logical = pio->io_logical; 772f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_GANG) 773f5383399SBill Moore zio->io_gang_leader = pio->io_gang_leader; 774e14bb325SJeff Bonwick zio_add_child(pio, zio); 775fa9e4066Sahrens } 776fa9e4066Sahrens 777fa9e4066Sahrens return (zio); 778fa9e4066Sahrens } 779fa9e4066Sahrens 7800a4e9518Sgw static void 781e14bb325SJeff Bonwick zio_destroy(zio_t *zio) 7820a4e9518Sgw { 7838363e80aSGeorge Wilson metaslab_trace_fini(&zio->io_alloc_list); 784a3f829aeSBill Moore list_destroy(&zio->io_parent_list); 785a3f829aeSBill Moore list_destroy(&zio->io_child_list); 786e14bb325SJeff Bonwick mutex_destroy(&zio->io_lock); 787e14bb325SJeff Bonwick cv_destroy(&zio->io_cv); 788e14bb325SJeff Bonwick kmem_cache_free(zio_cache, zio); 7890a4e9518Sgw } 7900a4e9518Sgw 791fa9e4066Sahrens zio_t * 792a3f829aeSBill Moore zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, 793b24ab676SJeff Bonwick void *private, enum zio_flag flags) 794fa9e4066Sahrens { 795fa9e4066Sahrens zio_t *zio; 796fa9e4066Sahrens 7975602294fSDan Kimmel zio = zio_create(pio, spa, 0, NULL, NULL, 0, 0, done, private, 798a3f829aeSBill Moore ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 799e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); 800fa9e4066Sahrens 801fa9e4066Sahrens return (zio); 802fa9e4066Sahrens } 803fa9e4066Sahrens 804fa9e4066Sahrens zio_t * 805b24ab676SJeff Bonwick zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) 806fa9e4066Sahrens { 807a3f829aeSBill Moore return (zio_null(NULL, spa, NULL, done, private, flags)); 808fa9e4066Sahrens } 809fa9e4066Sahrens 810f63ab3d5SMatthew Ahrens void 811f63ab3d5SMatthew Ahrens zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp) 812f63ab3d5SMatthew Ahrens { 813f63ab3d5SMatthew Ahrens if (!DMU_OT_IS_VALID(BP_GET_TYPE(bp))) { 814f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p has invalid TYPE %llu", 815f63ab3d5SMatthew Ahrens bp, (longlong_t)BP_GET_TYPE(bp)); 816f63ab3d5SMatthew Ahrens } 817f63ab3d5SMatthew Ahrens if (BP_GET_CHECKSUM(bp) >= ZIO_CHECKSUM_FUNCTIONS || 818f63ab3d5SMatthew Ahrens BP_GET_CHECKSUM(bp) <= ZIO_CHECKSUM_ON) { 819f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p has invalid CHECKSUM %llu", 820f63ab3d5SMatthew Ahrens bp, (longlong_t)BP_GET_CHECKSUM(bp)); 821f63ab3d5SMatthew Ahrens } 822f63ab3d5SMatthew Ahrens if (BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_FUNCTIONS || 823f63ab3d5SMatthew Ahrens BP_GET_COMPRESS(bp) <= ZIO_COMPRESS_ON) { 824f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p has invalid COMPRESS %llu", 825f63ab3d5SMatthew Ahrens bp, (longlong_t)BP_GET_COMPRESS(bp)); 826f63ab3d5SMatthew Ahrens } 827f63ab3d5SMatthew Ahrens if (BP_GET_LSIZE(bp) > SPA_MAXBLOCKSIZE) { 828f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p has invalid LSIZE %llu", 829f63ab3d5SMatthew Ahrens bp, (longlong_t)BP_GET_LSIZE(bp)); 830f63ab3d5SMatthew Ahrens } 831f63ab3d5SMatthew Ahrens if (BP_GET_PSIZE(bp) > SPA_MAXBLOCKSIZE) { 832f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p has invalid PSIZE %llu", 833f63ab3d5SMatthew Ahrens bp, (longlong_t)BP_GET_PSIZE(bp)); 834f63ab3d5SMatthew Ahrens } 835f63ab3d5SMatthew Ahrens 836f63ab3d5SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) { 837f63ab3d5SMatthew Ahrens if (BPE_GET_ETYPE(bp) > NUM_BP_EMBEDDED_TYPES) { 838f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p has invalid ETYPE %llu", 839f63ab3d5SMatthew Ahrens bp, (longlong_t)BPE_GET_ETYPE(bp)); 840f63ab3d5SMatthew Ahrens } 841f63ab3d5SMatthew Ahrens } 842f63ab3d5SMatthew Ahrens 8436f793812SPavel Zakharov /* 8446f793812SPavel Zakharov * Do not verify individual DVAs if the config is not trusted. This 8456f793812SPavel Zakharov * will be done once the zio is executed in vdev_mirror_map_alloc. 8466f793812SPavel Zakharov */ 8476f793812SPavel Zakharov if (!spa->spa_trust_config) 8486f793812SPavel Zakharov return; 8496f793812SPavel Zakharov 850f63ab3d5SMatthew Ahrens /* 851f63ab3d5SMatthew Ahrens * Pool-specific checks. 852f63ab3d5SMatthew Ahrens * 853f63ab3d5SMatthew Ahrens * Note: it would be nice to verify that the blk_birth and 854f63ab3d5SMatthew Ahrens * BP_PHYSICAL_BIRTH() are not too large. However, spa_freeze() 855f63ab3d5SMatthew Ahrens * allows the birth time of log blocks (and dmu_sync()-ed blocks 856f63ab3d5SMatthew Ahrens * that are in the log) to be arbitrarily large. 857f63ab3d5SMatthew Ahrens */ 858f63ab3d5SMatthew Ahrens for (int i = 0; i < BP_GET_NDVAS(bp); i++) { 859f63ab3d5SMatthew Ahrens uint64_t vdevid = DVA_GET_VDEV(&bp->blk_dva[i]); 860f63ab3d5SMatthew Ahrens if (vdevid >= spa->spa_root_vdev->vdev_children) { 861f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p DVA %u has invalid " 862f63ab3d5SMatthew Ahrens "VDEV %llu", 863f63ab3d5SMatthew Ahrens bp, i, (longlong_t)vdevid); 8645897eb49SJustin Gibbs continue; 865f63ab3d5SMatthew Ahrens } 866f63ab3d5SMatthew Ahrens vdev_t *vd = spa->spa_root_vdev->vdev_child[vdevid]; 867f63ab3d5SMatthew Ahrens if (vd == NULL) { 868f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p DVA %u has invalid " 869f63ab3d5SMatthew Ahrens "VDEV %llu", 870f63ab3d5SMatthew Ahrens bp, i, (longlong_t)vdevid); 8715897eb49SJustin Gibbs continue; 872f63ab3d5SMatthew Ahrens } 873f63ab3d5SMatthew Ahrens if (vd->vdev_ops == &vdev_hole_ops) { 874f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p DVA %u has hole " 875f63ab3d5SMatthew Ahrens "VDEV %llu", 876f63ab3d5SMatthew Ahrens bp, i, (longlong_t)vdevid); 8775897eb49SJustin Gibbs continue; 878f63ab3d5SMatthew Ahrens } 879f63ab3d5SMatthew Ahrens if (vd->vdev_ops == &vdev_missing_ops) { 880f63ab3d5SMatthew Ahrens /* 881f63ab3d5SMatthew Ahrens * "missing" vdevs are valid during import, but we 882f63ab3d5SMatthew Ahrens * don't have their detailed info (e.g. asize), so 883f63ab3d5SMatthew Ahrens * we can't perform any more checks on them. 884f63ab3d5SMatthew Ahrens */ 885f63ab3d5SMatthew Ahrens continue; 886f63ab3d5SMatthew Ahrens } 887f63ab3d5SMatthew Ahrens uint64_t offset = DVA_GET_OFFSET(&bp->blk_dva[i]); 888f63ab3d5SMatthew Ahrens uint64_t asize = DVA_GET_ASIZE(&bp->blk_dva[i]); 889f63ab3d5SMatthew Ahrens if (BP_IS_GANG(bp)) 890f63ab3d5SMatthew Ahrens asize = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE); 891f63ab3d5SMatthew Ahrens if (offset + asize > vd->vdev_asize) { 892f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p DVA %u has invalid " 893f63ab3d5SMatthew Ahrens "OFFSET %llu", 894f63ab3d5SMatthew Ahrens bp, i, (longlong_t)offset); 895f63ab3d5SMatthew Ahrens } 896f63ab3d5SMatthew Ahrens } 897f63ab3d5SMatthew Ahrens } 898f63ab3d5SMatthew Ahrens 8996f793812SPavel Zakharov boolean_t 9006f793812SPavel Zakharov zfs_dva_valid(spa_t *spa, const dva_t *dva, const blkptr_t *bp) 9016f793812SPavel Zakharov { 9026f793812SPavel Zakharov uint64_t vdevid = DVA_GET_VDEV(dva); 9036f793812SPavel Zakharov 9046f793812SPavel Zakharov if (vdevid >= spa->spa_root_vdev->vdev_children) 9056f793812SPavel Zakharov return (B_FALSE); 9066f793812SPavel Zakharov 9076f793812SPavel Zakharov vdev_t *vd = spa->spa_root_vdev->vdev_child[vdevid]; 9086f793812SPavel Zakharov if (vd == NULL) 9096f793812SPavel Zakharov return (B_FALSE); 9106f793812SPavel Zakharov 9116f793812SPavel Zakharov if (vd->vdev_ops == &vdev_hole_ops) 9126f793812SPavel Zakharov return (B_FALSE); 9136f793812SPavel Zakharov 9146f793812SPavel Zakharov if (vd->vdev_ops == &vdev_missing_ops) { 9156f793812SPavel Zakharov return (B_FALSE); 9166f793812SPavel Zakharov } 9176f793812SPavel Zakharov 9186f793812SPavel Zakharov uint64_t offset = DVA_GET_OFFSET(dva); 9196f793812SPavel Zakharov uint64_t asize = DVA_GET_ASIZE(dva); 9206f793812SPavel Zakharov 9216f793812SPavel Zakharov if (BP_IS_GANG(bp)) 9226f793812SPavel Zakharov asize = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE); 9236f793812SPavel Zakharov if (offset + asize > vd->vdev_asize) 9246f793812SPavel Zakharov return (B_FALSE); 9256f793812SPavel Zakharov 9266f793812SPavel Zakharov return (B_TRUE); 9276f793812SPavel Zakharov } 9286f793812SPavel Zakharov 929fa9e4066Sahrens zio_t * 930e14bb325SJeff Bonwick zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 931770499e1SDan Kimmel abd_t *data, uint64_t size, zio_done_func_t *done, void *private, 9327802d7bfSMatthew Ahrens zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb) 933fa9e4066Sahrens { 934fa9e4066Sahrens zio_t *zio; 935fa9e4066Sahrens 936f63ab3d5SMatthew Ahrens zfs_blkptr_verify(spa, bp); 937f63ab3d5SMatthew Ahrens 938b24ab676SJeff Bonwick zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, 9395602294fSDan Kimmel data, size, size, done, private, 940e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, NULL, 0, zb, 941b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 942b24ab676SJeff Bonwick ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); 943fa9e4066Sahrens 944fa9e4066Sahrens return (zio); 945fa9e4066Sahrens } 946fa9e4066Sahrens 947fa9e4066Sahrens zio_t * 948e14bb325SJeff Bonwick zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 949770499e1SDan Kimmel abd_t *data, uint64_t lsize, uint64_t psize, const zio_prop_t *zp, 9508df0bcf0SPaul Dagnelie zio_done_func_t *ready, zio_done_func_t *children_ready, 9518df0bcf0SPaul Dagnelie zio_done_func_t *physdone, zio_done_func_t *done, 9528df0bcf0SPaul Dagnelie void *private, zio_priority_t priority, enum zio_flag flags, 9538df0bcf0SPaul Dagnelie const zbookmark_phys_t *zb) 954fa9e4066Sahrens { 955fa9e4066Sahrens zio_t *zio; 956fa9e4066Sahrens 957e14bb325SJeff Bonwick ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && 958e14bb325SJeff Bonwick zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && 959e14bb325SJeff Bonwick zp->zp_compress >= ZIO_COMPRESS_OFF && 960e14bb325SJeff Bonwick zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && 961ad135b5dSChristopher Siden DMU_OT_IS_VALID(zp->zp_type) && 962e14bb325SJeff Bonwick zp->zp_level < 32 && 963b24ab676SJeff Bonwick zp->zp_copies > 0 && 96480901aeaSGeorge Wilson zp->zp_copies <= spa_max_replication(spa)); 9650a4e9518Sgw 9665602294fSDan Kimmel zio = zio_create(pio, spa, txg, bp, data, lsize, psize, done, private, 967e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 968b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 969b24ab676SJeff Bonwick ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); 970fa9e4066Sahrens 971c717a561Smaybee zio->io_ready = ready; 9728df0bcf0SPaul Dagnelie zio->io_children_ready = children_ready; 97369962b56SMatthew Ahrens zio->io_physdone = physdone; 974e14bb325SJeff Bonwick zio->io_prop = *zp; 975fa9e4066Sahrens 9765d7b4d43SMatthew Ahrens /* 9775d7b4d43SMatthew Ahrens * Data can be NULL if we are going to call zio_write_override() to 9785d7b4d43SMatthew Ahrens * provide the already-allocated BP. But we may need the data to 9795d7b4d43SMatthew Ahrens * verify a dedup hit (if requested). In this case, don't try to 980eb633035STom Caputi * dedup (just take the already-allocated BP verbatim). Encrypted 981eb633035STom Caputi * dedup blocks need data as well so we also disable dedup in this 982eb633035STom Caputi * case. 9835d7b4d43SMatthew Ahrens */ 984eb633035STom Caputi if (data == NULL && 985eb633035STom Caputi (zio->io_prop.zp_dedup_verify || zio->io_prop.zp_encrypt)) { 9865d7b4d43SMatthew Ahrens zio->io_prop.zp_dedup = zio->io_prop.zp_dedup_verify = B_FALSE; 9875d7b4d43SMatthew Ahrens } 9885d7b4d43SMatthew Ahrens 989fa9e4066Sahrens return (zio); 990fa9e4066Sahrens } 991fa9e4066Sahrens 992fa9e4066Sahrens zio_t * 993770499e1SDan Kimmel zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, abd_t *data, 99469962b56SMatthew Ahrens uint64_t size, zio_done_func_t *done, void *private, 9957802d7bfSMatthew Ahrens zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb) 996fa9e4066Sahrens { 997fa9e4066Sahrens zio_t *zio; 998fa9e4066Sahrens 9995602294fSDan Kimmel zio = zio_create(pio, spa, txg, bp, data, size, size, done, private, 10000f7643c7SGeorge Wilson ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_IO_REWRITE, NULL, 0, zb, 1001e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); 1002fa9e4066Sahrens 1003fa9e4066Sahrens return (zio); 1004fa9e4066Sahrens } 1005fa9e4066Sahrens 1006b24ab676SJeff Bonwick void 100780901aeaSGeorge Wilson zio_write_override(zio_t *zio, blkptr_t *bp, int copies, boolean_t nopwrite) 1008b24ab676SJeff Bonwick { 1009b24ab676SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 1010b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1011b24ab676SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 1012b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); 1013b24ab676SJeff Bonwick 101480901aeaSGeorge Wilson /* 101580901aeaSGeorge Wilson * We must reset the io_prop to match the values that existed 101680901aeaSGeorge Wilson * when the bp was first written by dmu_sync() keeping in mind 101780901aeaSGeorge Wilson * that nopwrite and dedup are mutually exclusive. 101880901aeaSGeorge Wilson */ 101980901aeaSGeorge Wilson zio->io_prop.zp_dedup = nopwrite ? B_FALSE : zio->io_prop.zp_dedup; 102080901aeaSGeorge Wilson zio->io_prop.zp_nopwrite = nopwrite; 1021b24ab676SJeff Bonwick zio->io_prop.zp_copies = copies; 1022b24ab676SJeff Bonwick zio->io_bp_override = bp; 1023b24ab676SJeff Bonwick } 1024b24ab676SJeff Bonwick 1025b24ab676SJeff Bonwick void 1026b24ab676SJeff Bonwick zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) 1027b24ab676SJeff Bonwick { 10285d7b4d43SMatthew Ahrens 10295cabbc6bSPrashanth Sreenivasa zfs_blkptr_verify(spa, bp); 10305cabbc6bSPrashanth Sreenivasa 10315d7b4d43SMatthew Ahrens /* 10325d7b4d43SMatthew Ahrens * The check for EMBEDDED is a performance optimization. We 10335d7b4d43SMatthew Ahrens * process the free here (by ignoring it) rather than 10345d7b4d43SMatthew Ahrens * putting it on the list and then processing it in zio_free_sync(). 10355d7b4d43SMatthew Ahrens */ 10365d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 10375d7b4d43SMatthew Ahrens return; 10383b2aab18SMatthew Ahrens metaslab_check_free(spa, bp); 10399cb154a3SMatthew Ahrens 10409cb154a3SMatthew Ahrens /* 10419cb154a3SMatthew Ahrens * Frees that are for the currently-syncing txg, are not going to be 10429cb154a3SMatthew Ahrens * deferred, and which will not need to do a read (i.e. not GANG or 10439cb154a3SMatthew Ahrens * DEDUP), can be processed immediately. Otherwise, put them on the 10449cb154a3SMatthew Ahrens * in-memory list for later processing. 1045814dcd43SSerapheim Dimitropoulos * 1046814dcd43SSerapheim Dimitropoulos * Note that we only defer frees after zfs_sync_pass_deferred_free 1047814dcd43SSerapheim Dimitropoulos * when the log space map feature is disabled. [see relevant comment 1048814dcd43SSerapheim Dimitropoulos * in spa_sync_iterate_to_convergence()] 10499cb154a3SMatthew Ahrens */ 1050814dcd43SSerapheim Dimitropoulos if (BP_IS_GANG(bp) || 1051814dcd43SSerapheim Dimitropoulos BP_GET_DEDUP(bp) || 10529cb154a3SMatthew Ahrens txg != spa->spa_syncing_txg || 1053814dcd43SSerapheim Dimitropoulos (spa_sync_pass(spa) >= zfs_sync_pass_deferred_free && 1054814dcd43SSerapheim Dimitropoulos !spa_feature_is_active(spa, SPA_FEATURE_LOG_SPACEMAP))) { 10559cb154a3SMatthew Ahrens bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp); 10569cb154a3SMatthew Ahrens } else { 10579cb154a3SMatthew Ahrens VERIFY0(zio_wait(zio_free_sync(NULL, spa, txg, bp, 0))); 10589cb154a3SMatthew Ahrens } 1059b24ab676SJeff Bonwick } 1060b24ab676SJeff Bonwick 1061fa9e4066Sahrens zio_t * 1062b24ab676SJeff Bonwick zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 1063b24ab676SJeff Bonwick enum zio_flag flags) 1064fa9e4066Sahrens { 1065fa9e4066Sahrens zio_t *zio; 10669cb154a3SMatthew Ahrens enum zio_stage stage = ZIO_FREE_PIPELINE; 1067fa9e4066Sahrens 1068fa9e4066Sahrens ASSERT(!BP_IS_HOLE(bp)); 1069b24ab676SJeff Bonwick ASSERT(spa_syncing_txg(spa) == txg); 1070fa9e4066Sahrens 10715d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 10725d7b4d43SMatthew Ahrens return (zio_null(pio, spa, NULL, NULL, NULL, 0)); 10735d7b4d43SMatthew Ahrens 10743b2aab18SMatthew Ahrens metaslab_check_free(spa, bp); 10756e6d5868SMatthew Ahrens arc_freed(spa, bp); 1076a3874b8bSToomas Soome dsl_scan_freed(spa, bp); 10773b2aab18SMatthew Ahrens 10789cb154a3SMatthew Ahrens /* 10799cb154a3SMatthew Ahrens * GANG and DEDUP blocks can induce a read (for the gang block header, 10809cb154a3SMatthew Ahrens * or the DDT), so issue them asynchronously so that this thread is 10819cb154a3SMatthew Ahrens * not tied up. 10829cb154a3SMatthew Ahrens */ 10839cb154a3SMatthew Ahrens if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp)) 10849cb154a3SMatthew Ahrens stage |= ZIO_STAGE_ISSUE_ASYNC; 10859cb154a3SMatthew Ahrens 1086e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 10875602294fSDan Kimmel BP_GET_PSIZE(bp), NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_NOW, 10885602294fSDan Kimmel flags, NULL, 0, NULL, ZIO_STAGE_OPEN, stage); 10899cb154a3SMatthew Ahrens 1090fa9e4066Sahrens return (zio); 1091fa9e4066Sahrens } 1092fa9e4066Sahrens 1093fa9e4066Sahrens zio_t * 1094b24ab676SJeff Bonwick zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 1095b24ab676SJeff Bonwick zio_done_func_t *done, void *private, enum zio_flag flags) 1096fa9e4066Sahrens { 1097fa9e4066Sahrens zio_t *zio; 1098fa9e4066Sahrens 10995cabbc6bSPrashanth Sreenivasa zfs_blkptr_verify(spa, bp); 11005d7b4d43SMatthew Ahrens 11015d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 11025d7b4d43SMatthew Ahrens return (zio_null(pio, spa, NULL, NULL, NULL, 0)); 11035d7b4d43SMatthew Ahrens 1104fa9e4066Sahrens /* 1105fa9e4066Sahrens * A claim is an allocation of a specific block. Claims are needed 1106fa9e4066Sahrens * to support immediate writes in the intent log. The issue is that 1107fa9e4066Sahrens * immediate writes contain committed data, but in a txg that was 1108fa9e4066Sahrens * *not* committed. Upon opening the pool after an unclean shutdown, 1109fa9e4066Sahrens * the intent log claims all blocks that contain immediate write data 1110fa9e4066Sahrens * so that the SPA knows they're in use. 1111fa9e4066Sahrens * 1112fa9e4066Sahrens * All claims *must* be resolved in the first txg -- before the SPA 1113fa9e4066Sahrens * starts allocating blocks -- so that nothing is allocated twice. 1114b24ab676SJeff Bonwick * If txg == 0 we just verify that the block is claimable. 1115fa9e4066Sahrens */ 111686714001SSerapheim Dimitropoulos ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, 111786714001SSerapheim Dimitropoulos spa_min_claim_txg(spa)); 111886714001SSerapheim Dimitropoulos ASSERT(txg == spa_min_claim_txg(spa) || txg == 0); 1119b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ 1120fa9e4066Sahrens 1121e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 11225602294fSDan Kimmel BP_GET_PSIZE(bp), done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, 11235602294fSDan Kimmel flags, NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); 11240f7643c7SGeorge Wilson ASSERT0(zio->io_queued_timestamp); 1125fa9e4066Sahrens 1126fa9e4066Sahrens return (zio); 1127fa9e4066Sahrens } 1128fa9e4066Sahrens 1129fa9e4066Sahrens zio_t * 1130fa9e4066Sahrens zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 113169962b56SMatthew Ahrens zio_done_func_t *done, void *private, enum zio_flag flags) 1132fa9e4066Sahrens { 1133fa9e4066Sahrens zio_t *zio; 1134fa9e4066Sahrens int c; 1135fa9e4066Sahrens 1136fa9e4066Sahrens if (vd->vdev_children == 0) { 11375602294fSDan Kimmel zio = zio_create(pio, spa, 0, NULL, NULL, 0, 0, done, private, 113869962b56SMatthew Ahrens ZIO_TYPE_IOCTL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 1139fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); 1140fa9e4066Sahrens 1141fa9e4066Sahrens zio->io_cmd = cmd; 1142fa9e4066Sahrens } else { 1143a3f829aeSBill Moore zio = zio_null(pio, spa, NULL, NULL, NULL, flags); 1144fa9e4066Sahrens 1145fa9e4066Sahrens for (c = 0; c < vd->vdev_children; c++) 1146fa9e4066Sahrens zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, 114769962b56SMatthew Ahrens done, private, flags)); 1148fa9e4066Sahrens } 1149fa9e4066Sahrens 1150fa9e4066Sahrens return (zio); 1151fa9e4066Sahrens } 1152fa9e4066Sahrens 1153084fd14fSBrian Behlendorf zio_t * 1154084fd14fSBrian Behlendorf zio_trim(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 1155084fd14fSBrian Behlendorf zio_done_func_t *done, void *private, zio_priority_t priority, 1156084fd14fSBrian Behlendorf enum zio_flag flags, enum trim_flag trim_flags) 1157084fd14fSBrian Behlendorf { 1158084fd14fSBrian Behlendorf zio_t *zio; 1159084fd14fSBrian Behlendorf 1160084fd14fSBrian Behlendorf ASSERT0(vd->vdev_children); 1161084fd14fSBrian Behlendorf ASSERT0(P2PHASE(offset, 1ULL << vd->vdev_ashift)); 1162084fd14fSBrian Behlendorf ASSERT0(P2PHASE(size, 1ULL << vd->vdev_ashift)); 1163084fd14fSBrian Behlendorf ASSERT3U(size, !=, 0); 1164084fd14fSBrian Behlendorf 1165084fd14fSBrian Behlendorf zio = zio_create(pio, vd->vdev_spa, 0, NULL, NULL, size, size, done, 1166084fd14fSBrian Behlendorf private, ZIO_TYPE_TRIM, priority, flags | ZIO_FLAG_PHYSICAL, 1167084fd14fSBrian Behlendorf vd, offset, NULL, ZIO_STAGE_OPEN, ZIO_TRIM_PIPELINE); 1168084fd14fSBrian Behlendorf zio->io_trim_flags = trim_flags; 1169084fd14fSBrian Behlendorf 1170084fd14fSBrian Behlendorf return (zio); 1171084fd14fSBrian Behlendorf } 1172084fd14fSBrian Behlendorf 1173fa9e4066Sahrens zio_t * 1174fa9e4066Sahrens zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 1175770499e1SDan Kimmel abd_t *data, int checksum, zio_done_func_t *done, void *private, 117669962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, boolean_t labels) 1177fa9e4066Sahrens { 1178fa9e4066Sahrens zio_t *zio; 11790a4e9518Sgw 1180e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 1181e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 1182e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 1183e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 1184fa9e4066Sahrens 11855602294fSDan Kimmel zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, size, done, 11865602294fSDan Kimmel private, ZIO_TYPE_READ, priority, flags | ZIO_FLAG_PHYSICAL, vd, 11875602294fSDan Kimmel offset, NULL, ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); 1188fa9e4066Sahrens 1189e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 1190fa9e4066Sahrens 1191fa9e4066Sahrens return (zio); 1192fa9e4066Sahrens } 1193fa9e4066Sahrens 1194fa9e4066Sahrens zio_t * 1195fa9e4066Sahrens zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 1196770499e1SDan Kimmel abd_t *data, int checksum, zio_done_func_t *done, void *private, 119769962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, boolean_t labels) 1198fa9e4066Sahrens { 1199fa9e4066Sahrens zio_t *zio; 12000a4e9518Sgw 1201e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 1202e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 1203e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 1204e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 1205fa9e4066Sahrens 12065602294fSDan Kimmel zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, size, done, 12075602294fSDan Kimmel private, ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_PHYSICAL, vd, 12085602294fSDan Kimmel offset, NULL, ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); 1209fa9e4066Sahrens 1210e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 1211fa9e4066Sahrens 121245818ee1SMatthew Ahrens if (zio_checksum_table[checksum].ci_flags & ZCHECKSUM_FLAG_EMBEDDED) { 1213fa9e4066Sahrens /* 12146e1f5caaSNeil Perrin * zec checksums are necessarily destructive -- they modify 1215e14bb325SJeff Bonwick * the end of the write buffer to hold the verifier/checksum. 1216fa9e4066Sahrens * Therefore, we must make a local copy in case the data is 1217e14bb325SJeff Bonwick * being written to multiple places in parallel. 1218fa9e4066Sahrens */ 1219770499e1SDan Kimmel abd_t *wbuf = abd_alloc_sametype(data, size); 1220770499e1SDan Kimmel abd_copy(wbuf, data, size); 1221770499e1SDan Kimmel 1222e14bb325SJeff Bonwick zio_push_transform(zio, wbuf, size, size, NULL); 1223fa9e4066Sahrens } 1224fa9e4066Sahrens 1225fa9e4066Sahrens return (zio); 1226fa9e4066Sahrens } 1227fa9e4066Sahrens 1228fa9e4066Sahrens /* 1229e14bb325SJeff Bonwick * Create a child I/O to do some work for us. 1230fa9e4066Sahrens */ 1231fa9e4066Sahrens zio_t * 1232e14bb325SJeff Bonwick zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, 1233770499e1SDan Kimmel abd_t *data, uint64_t size, int type, zio_priority_t priority, 1234dcbf3bd6SGeorge Wilson enum zio_flag flags, zio_done_func_t *done, void *private) 1235fa9e4066Sahrens { 1236b24ab676SJeff Bonwick enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; 1237e14bb325SJeff Bonwick zio_t *zio; 1238e14bb325SJeff Bonwick 12395cabbc6bSPrashanth Sreenivasa /* 12405cabbc6bSPrashanth Sreenivasa * vdev child I/Os do not propagate their error to the parent. 12415cabbc6bSPrashanth Sreenivasa * Therefore, for correct operation the caller *must* check for 12425cabbc6bSPrashanth Sreenivasa * and handle the error in the child i/o's done callback. 12435cabbc6bSPrashanth Sreenivasa * The only exceptions are i/os that we don't care about 12445cabbc6bSPrashanth Sreenivasa * (OPTIONAL or REPAIR). 12455cabbc6bSPrashanth Sreenivasa */ 12465cabbc6bSPrashanth Sreenivasa ASSERT((flags & ZIO_FLAG_OPTIONAL) || (flags & ZIO_FLAG_IO_REPAIR) || 12475cabbc6bSPrashanth Sreenivasa done != NULL); 12485cabbc6bSPrashanth Sreenivasa 1249fa9e4066Sahrens if (type == ZIO_TYPE_READ && bp != NULL) { 1250fa9e4066Sahrens /* 1251fa9e4066Sahrens * If we have the bp, then the child should perform the 1252fa9e4066Sahrens * checksum and the parent need not. This pushes error 1253fa9e4066Sahrens * detection as close to the leaves as possible and 1254fa9e4066Sahrens * eliminates redundant checksums in the interior nodes. 1255fa9e4066Sahrens */ 1256b24ab676SJeff Bonwick pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; 1257b24ab676SJeff Bonwick pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 1258fa9e4066Sahrens } 1259fa9e4066Sahrens 12605cabbc6bSPrashanth Sreenivasa if (vd->vdev_ops->vdev_op_leaf) { 12615cabbc6bSPrashanth Sreenivasa ASSERT0(vd->vdev_children); 1262e14bb325SJeff Bonwick offset += VDEV_LABEL_START_SIZE; 12635cabbc6bSPrashanth Sreenivasa } 1264e14bb325SJeff Bonwick 12655cabbc6bSPrashanth Sreenivasa flags |= ZIO_VDEV_CHILD_FLAGS(pio); 1266b24ab676SJeff Bonwick 1267b24ab676SJeff Bonwick /* 1268b24ab676SJeff Bonwick * If we've decided to do a repair, the write is not speculative -- 1269b24ab676SJeff Bonwick * even if the original read was. 1270b24ab676SJeff Bonwick */ 1271b24ab676SJeff Bonwick if (flags & ZIO_FLAG_IO_REPAIR) 1272b24ab676SJeff Bonwick flags &= ~ZIO_FLAG_SPECULATIVE; 1273b24ab676SJeff Bonwick 12740f7643c7SGeorge Wilson /* 12750f7643c7SGeorge Wilson * If we're creating a child I/O that is not associated with a 12760f7643c7SGeorge Wilson * top-level vdev, then the child zio is not an allocating I/O. 12770f7643c7SGeorge Wilson * If this is a retried I/O then we ignore it since we will 12780f7643c7SGeorge Wilson * have already processed the original allocating I/O. 12790f7643c7SGeorge Wilson */ 12800f7643c7SGeorge Wilson if (flags & ZIO_FLAG_IO_ALLOCATING && 12810f7643c7SGeorge Wilson (vd != vd->vdev_top || (flags & ZIO_FLAG_IO_RETRY))) { 1282663207adSDon Brady ASSERT(pio->io_metaslab_class != NULL); 1283663207adSDon Brady ASSERT(pio->io_metaslab_class->mc_alloc_throttle_enabled); 12840f7643c7SGeorge Wilson ASSERT(type == ZIO_TYPE_WRITE); 12850f7643c7SGeorge Wilson ASSERT(priority == ZIO_PRIORITY_ASYNC_WRITE); 12860f7643c7SGeorge Wilson ASSERT(!(flags & ZIO_FLAG_IO_REPAIR)); 12870f7643c7SGeorge Wilson ASSERT(!(pio->io_flags & ZIO_FLAG_IO_REWRITE) || 12880f7643c7SGeorge Wilson pio->io_child_type == ZIO_CHILD_GANG); 12890f7643c7SGeorge Wilson 12900f7643c7SGeorge Wilson flags &= ~ZIO_FLAG_IO_ALLOCATING; 12910f7643c7SGeorge Wilson } 12920f7643c7SGeorge Wilson 12935602294fSDan Kimmel zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, size, 1294b24ab676SJeff Bonwick done, private, type, priority, flags, vd, offset, &pio->io_bookmark, 1295b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, pipeline); 12960f7643c7SGeorge Wilson ASSERT3U(zio->io_child_type, ==, ZIO_CHILD_VDEV); 1297fa9e4066Sahrens 129869962b56SMatthew Ahrens zio->io_physdone = pio->io_physdone; 129969962b56SMatthew Ahrens if (vd->vdev_ops->vdev_op_leaf && zio->io_logical != NULL) 130069962b56SMatthew Ahrens zio->io_logical->io_phys_children++; 130169962b56SMatthew Ahrens 1302e14bb325SJeff Bonwick return (zio); 130332b87932Sek } 130432b87932Sek 1305e14bb325SJeff Bonwick zio_t * 1306770499e1SDan Kimmel zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, abd_t *data, uint64_t size, 13073a4b1be9SMatthew Ahrens zio_type_t type, zio_priority_t priority, enum zio_flag flags, 13089a686fbcSPaul Dagnelie zio_done_func_t *done, void *private) 1309fa9e4066Sahrens { 1310e14bb325SJeff Bonwick zio_t *zio; 1311fa9e4066Sahrens 1312e14bb325SJeff Bonwick ASSERT(vd->vdev_ops->vdev_op_leaf); 1313fa9e4066Sahrens 1314e14bb325SJeff Bonwick zio = zio_create(NULL, vd->vdev_spa, 0, NULL, 13155602294fSDan Kimmel data, size, size, done, private, type, priority, 131669962b56SMatthew Ahrens flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY | ZIO_FLAG_DELEGATED, 1317e14bb325SJeff Bonwick vd, offset, NULL, 1318b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); 1319fa9e4066Sahrens 1320e14bb325SJeff Bonwick return (zio); 1321e05725b1Sbonwick } 1322e05725b1Sbonwick 1323e05725b1Sbonwick void 1324e14bb325SJeff Bonwick zio_flush(zio_t *zio, vdev_t *vd) 1325e05725b1Sbonwick { 1326e14bb325SJeff Bonwick zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, 132769962b56SMatthew Ahrens NULL, NULL, 1328e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); 1329fa9e4066Sahrens } 1330fa9e4066Sahrens 13316e1f5caaSNeil Perrin void 13326e1f5caaSNeil Perrin zio_shrink(zio_t *zio, uint64_t size) 13336e1f5caaSNeil Perrin { 13341271e4b1SPrakash Surya ASSERT3P(zio->io_executor, ==, NULL); 13351271e4b1SPrakash Surya ASSERT3P(zio->io_orig_size, ==, zio->io_size); 13361271e4b1SPrakash Surya ASSERT3U(size, <=, zio->io_size); 13376e1f5caaSNeil Perrin 13386e1f5caaSNeil Perrin /* 13396e1f5caaSNeil Perrin * We don't shrink for raidz because of problems with the 13406e1f5caaSNeil Perrin * reconstruction when reading back less than the block size. 13416e1f5caaSNeil Perrin * Note, BP_IS_RAIDZ() assumes no compression. 13426e1f5caaSNeil Perrin */ 13436e1f5caaSNeil Perrin ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); 13445602294fSDan Kimmel if (!BP_IS_RAIDZ(zio->io_bp)) { 13455602294fSDan Kimmel /* we are not doing a raw write */ 13465602294fSDan Kimmel ASSERT3U(zio->io_size, ==, zio->io_lsize); 13475602294fSDan Kimmel zio->io_orig_size = zio->io_size = zio->io_lsize = size; 13485602294fSDan Kimmel } 13496e1f5caaSNeil Perrin } 13506e1f5caaSNeil Perrin 1351fa9e4066Sahrens /* 1352fa9e4066Sahrens * ========================================================================== 1353e14bb325SJeff Bonwick * Prepare to read and write logical blocks 1354fa9e4066Sahrens * ========================================================================== 1355fa9e4066Sahrens */ 1356e14bb325SJeff Bonwick 1357e05725b1Sbonwick static int 1358e14bb325SJeff Bonwick zio_read_bp_init(zio_t *zio) 1359fa9e4066Sahrens { 1360e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1361eb633035STom Caputi uint64_t psize = 1362eb633035STom Caputi BP_IS_EMBEDDED(bp) ? BPE_GET_PSIZE(bp) : BP_GET_PSIZE(bp); 1363e05725b1Sbonwick 13645cabbc6bSPrashanth Sreenivasa ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy); 13655cabbc6bSPrashanth Sreenivasa 136603361682SJeff Bonwick if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && 1367f5383399SBill Moore zio->io_child_type == ZIO_CHILD_LOGICAL && 1368eb633035STom Caputi !(zio->io_flags & ZIO_FLAG_RAW_COMPRESS)) { 1369770499e1SDan Kimmel zio_push_transform(zio, abd_alloc_sametype(zio->io_abd, psize), 1370770499e1SDan Kimmel psize, psize, zio_decompress); 1371e14bb325SJeff Bonwick } 1372fa9e4066Sahrens 1373eb633035STom Caputi if (((BP_IS_PROTECTED(bp) && !(zio->io_flags & ZIO_FLAG_RAW_ENCRYPT)) || 1374eb633035STom Caputi BP_HAS_INDIRECT_MAC_CKSUM(bp)) && 1375eb633035STom Caputi zio->io_child_type == ZIO_CHILD_LOGICAL) { 1376eb633035STom Caputi zio_push_transform(zio, abd_alloc_sametype(zio->io_abd, psize), 1377eb633035STom Caputi psize, psize, zio_decrypt); 1378eb633035STom Caputi } 1379770499e1SDan Kimmel 1380eb633035STom Caputi if (BP_IS_EMBEDDED(bp) && BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA) { 1381770499e1SDan Kimmel int psize = BPE_GET_PSIZE(bp); 1382770499e1SDan Kimmel void *data = abd_borrow_buf(zio->io_abd, psize); 1383eb633035STom Caputi 1384eb633035STom Caputi zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1385770499e1SDan Kimmel decode_embedded_bp_compressed(bp, data); 1386770499e1SDan Kimmel abd_return_buf_copy(zio->io_abd, data, psize); 13875d7b4d43SMatthew Ahrens } else { 13885d7b4d43SMatthew Ahrens ASSERT(!BP_IS_EMBEDDED(bp)); 13895cabbc6bSPrashanth Sreenivasa ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy); 13905d7b4d43SMatthew Ahrens } 13915d7b4d43SMatthew Ahrens 1392ad135b5dSChristopher Siden if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) && BP_GET_LEVEL(bp) == 0) 1393e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 1394fa9e4066Sahrens 1395bbfd46c4SJeff Bonwick if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) 1396bbfd46c4SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 1397bbfd46c4SJeff Bonwick 1398b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) 1399b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_READ_PIPELINE; 1400b24ab676SJeff Bonwick 1401e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1402fa9e4066Sahrens } 1403fa9e4066Sahrens 1404e05725b1Sbonwick static int 1405e14bb325SJeff Bonwick zio_write_bp_init(zio_t *zio) 14060a4e9518Sgw { 1407e14bb325SJeff Bonwick if (!IO_IS_ALLOCATING(zio)) 1408e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 14090a4e9518Sgw 1410b24ab676SJeff Bonwick ASSERT(zio->io_child_type != ZIO_CHILD_DDT); 1411b24ab676SJeff Bonwick 1412b24ab676SJeff Bonwick if (zio->io_bp_override) { 14130f7643c7SGeorge Wilson blkptr_t *bp = zio->io_bp; 14140f7643c7SGeorge Wilson zio_prop_t *zp = &zio->io_prop; 14150f7643c7SGeorge Wilson 1416b24ab676SJeff Bonwick ASSERT(bp->blk_birth != zio->io_txg); 1417b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); 1418b24ab676SJeff Bonwick 1419b24ab676SJeff Bonwick *bp = *zio->io_bp_override; 1420b24ab676SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1421b24ab676SJeff Bonwick 14225d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 14235d7b4d43SMatthew Ahrens return (ZIO_PIPELINE_CONTINUE); 14245d7b4d43SMatthew Ahrens 142580901aeaSGeorge Wilson /* 142680901aeaSGeorge Wilson * If we've been overridden and nopwrite is set then 142780901aeaSGeorge Wilson * set the flag accordingly to indicate that a nopwrite 142880901aeaSGeorge Wilson * has already occurred. 142980901aeaSGeorge Wilson */ 143080901aeaSGeorge Wilson if (!BP_IS_HOLE(bp) && zp->zp_nopwrite) { 143180901aeaSGeorge Wilson ASSERT(!zp->zp_dedup); 14320f7643c7SGeorge Wilson ASSERT3U(BP_GET_CHECKSUM(bp), ==, zp->zp_checksum); 143380901aeaSGeorge Wilson zio->io_flags |= ZIO_FLAG_NOPWRITE; 143480901aeaSGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 143580901aeaSGeorge Wilson } 143680901aeaSGeorge Wilson 143780901aeaSGeorge Wilson ASSERT(!zp->zp_nopwrite); 143880901aeaSGeorge Wilson 1439b24ab676SJeff Bonwick if (BP_IS_HOLE(bp) || !zp->zp_dedup) 1440b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1441b24ab676SJeff Bonwick 144245818ee1SMatthew Ahrens ASSERT((zio_checksum_table[zp->zp_checksum].ci_flags & 144345818ee1SMatthew Ahrens ZCHECKSUM_FLAG_DEDUP) || zp->zp_dedup_verify); 1444b24ab676SJeff Bonwick 1445eb633035STom Caputi if (BP_GET_CHECKSUM(bp) == zp->zp_checksum && 1446eb633035STom Caputi !zp->zp_encrypt) { 1447b24ab676SJeff Bonwick BP_SET_DEDUP(bp, 1); 1448b24ab676SJeff Bonwick zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; 1449b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1450b24ab676SJeff Bonwick } 14510f7643c7SGeorge Wilson 14520f7643c7SGeorge Wilson /* 14530f7643c7SGeorge Wilson * We were unable to handle this as an override bp, treat 14540f7643c7SGeorge Wilson * it as a regular write I/O. 14550f7643c7SGeorge Wilson */ 1456b39b744bSMatthew Ahrens zio->io_bp_override = NULL; 14570f7643c7SGeorge Wilson *bp = zio->io_bp_orig; 14580f7643c7SGeorge Wilson zio->io_pipeline = zio->io_orig_pipeline; 1459b24ab676SJeff Bonwick } 14600a4e9518Sgw 14610f7643c7SGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 14620f7643c7SGeorge Wilson } 14630f7643c7SGeorge Wilson 14640f7643c7SGeorge Wilson static int 14650f7643c7SGeorge Wilson zio_write_compress(zio_t *zio) 14660f7643c7SGeorge Wilson { 14670f7643c7SGeorge Wilson spa_t *spa = zio->io_spa; 14680f7643c7SGeorge Wilson zio_prop_t *zp = &zio->io_prop; 14690f7643c7SGeorge Wilson enum zio_compress compress = zp->zp_compress; 14700f7643c7SGeorge Wilson blkptr_t *bp = zio->io_bp; 14715602294fSDan Kimmel uint64_t lsize = zio->io_lsize; 14725602294fSDan Kimmel uint64_t psize = zio->io_size; 14730f7643c7SGeorge Wilson int pass = 1; 14740f7643c7SGeorge Wilson 14750f7643c7SGeorge Wilson /* 14760f7643c7SGeorge Wilson * If our children haven't all reached the ready stage, 14770f7643c7SGeorge Wilson * wait for them and then repeat this pipeline stage. 14780f7643c7SGeorge Wilson */ 1479d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_LOGICAL_BIT | 1480d6e1c446SGeorge Wilson ZIO_CHILD_GANG_BIT, ZIO_WAIT_READY)) { 14810f7643c7SGeorge Wilson return (ZIO_PIPELINE_STOP); 1482d6e1c446SGeorge Wilson } 14830f7643c7SGeorge Wilson 14840f7643c7SGeorge Wilson if (!IO_IS_ALLOCATING(zio)) 14850f7643c7SGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 14860f7643c7SGeorge Wilson 14870f7643c7SGeorge Wilson if (zio->io_children_ready != NULL) { 14880f7643c7SGeorge Wilson /* 14890f7643c7SGeorge Wilson * Now that all our children are ready, run the callback 14900f7643c7SGeorge Wilson * associated with this zio in case it wants to modify the 14910f7643c7SGeorge Wilson * data to be written. 14920f7643c7SGeorge Wilson */ 14930f7643c7SGeorge Wilson ASSERT3U(zp->zp_level, >, 0); 14940f7643c7SGeorge Wilson zio->io_children_ready(zio); 14950f7643c7SGeorge Wilson } 14960f7643c7SGeorge Wilson 14970f7643c7SGeorge Wilson ASSERT(zio->io_child_type != ZIO_CHILD_DDT); 14980f7643c7SGeorge Wilson ASSERT(zio->io_bp_override == NULL); 14990f7643c7SGeorge Wilson 150043466aaeSMax Grossman if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg) { 1501e14bb325SJeff Bonwick /* 1502e14bb325SJeff Bonwick * We're rewriting an existing block, which means we're 1503e14bb325SJeff Bonwick * working on behalf of spa_sync(). For spa_sync() to 1504e14bb325SJeff Bonwick * converge, it must eventually be the case that we don't 1505e14bb325SJeff Bonwick * have to allocate new blocks. But compression changes 1506e14bb325SJeff Bonwick * the blocksize, which forces a reallocate, and makes 1507e14bb325SJeff Bonwick * convergence take longer. Therefore, after the first 1508e14bb325SJeff Bonwick * few passes, stop compressing to ensure convergence. 1509e14bb325SJeff Bonwick */ 1510b24ab676SJeff Bonwick pass = spa_sync_pass(spa); 1511b24ab676SJeff Bonwick 1512b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(spa)); 1513b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1514b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp)); 1515e05725b1Sbonwick 151601f55e48SGeorge Wilson if (pass >= zfs_sync_pass_dont_compress) 1517e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 1518e05725b1Sbonwick 1519e14bb325SJeff Bonwick /* Make sure someone doesn't change their mind on overwrites */ 15205d7b4d43SMatthew Ahrens ASSERT(BP_IS_EMBEDDED(bp) || MIN(zp->zp_copies + BP_IS_GANG(bp), 1521b24ab676SJeff Bonwick spa_max_replication(spa)) == BP_GET_NDVAS(bp)); 1522e14bb325SJeff Bonwick } 1523fa9e4066Sahrens 15245602294fSDan Kimmel /* If it's a compressed write that is not raw, compress the buffer. */ 1525eb633035STom Caputi if (compress != ZIO_COMPRESS_OFF && 1526eb633035STom Caputi !(zio->io_flags & ZIO_FLAG_RAW_COMPRESS)) { 1527b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(lsize); 1528770499e1SDan Kimmel psize = zio_compress_data(compress, zio->io_abd, cbuf, lsize); 1529b24ab676SJeff Bonwick if (psize == 0 || psize == lsize) { 1530e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 1531b24ab676SJeff Bonwick zio_buf_free(cbuf, lsize); 1532eb633035STom Caputi } else if (!zp->zp_dedup && !zp->zp_encrypt && 1533eb633035STom Caputi psize <= BPE_PAYLOAD_SIZE && 15345d7b4d43SMatthew Ahrens zp->zp_level == 0 && !DMU_OT_HAS_FILL(zp->zp_type) && 15355d7b4d43SMatthew Ahrens spa_feature_is_enabled(spa, SPA_FEATURE_EMBEDDED_DATA)) { 15365d7b4d43SMatthew Ahrens encode_embedded_bp_compressed(bp, 15375d7b4d43SMatthew Ahrens cbuf, compress, lsize, psize); 15385d7b4d43SMatthew Ahrens BPE_SET_ETYPE(bp, BP_EMBEDDED_TYPE_DATA); 15395d7b4d43SMatthew Ahrens BP_SET_TYPE(bp, zio->io_prop.zp_type); 15405d7b4d43SMatthew Ahrens BP_SET_LEVEL(bp, zio->io_prop.zp_level); 15415d7b4d43SMatthew Ahrens zio_buf_free(cbuf, lsize); 15425d7b4d43SMatthew Ahrens bp->blk_birth = zio->io_txg; 15435d7b4d43SMatthew Ahrens zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 15445d7b4d43SMatthew Ahrens ASSERT(spa_feature_is_active(spa, 15455d7b4d43SMatthew Ahrens SPA_FEATURE_EMBEDDED_DATA)); 15465d7b4d43SMatthew Ahrens return (ZIO_PIPELINE_CONTINUE); 1547b24ab676SJeff Bonwick } else { 15485d7b4d43SMatthew Ahrens /* 154981cd5c55SMatthew Ahrens * Round up compressed size up to the ashift 155081cd5c55SMatthew Ahrens * of the smallest-ashift device, and zero the tail. 155181cd5c55SMatthew Ahrens * This ensures that the compressed size of the BP 155281cd5c55SMatthew Ahrens * (and thus compressratio property) are correct, 155381cd5c55SMatthew Ahrens * in that we charge for the padding used to fill out 155481cd5c55SMatthew Ahrens * the last sector. 15555d7b4d43SMatthew Ahrens */ 155681cd5c55SMatthew Ahrens ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT); 155781cd5c55SMatthew Ahrens size_t rounded = (size_t)P2ROUNDUP(psize, 155881cd5c55SMatthew Ahrens 1ULL << spa->spa_min_ashift); 155981cd5c55SMatthew Ahrens if (rounded >= lsize) { 15605d7b4d43SMatthew Ahrens compress = ZIO_COMPRESS_OFF; 15615d7b4d43SMatthew Ahrens zio_buf_free(cbuf, lsize); 156281cd5c55SMatthew Ahrens psize = lsize; 15635d7b4d43SMatthew Ahrens } else { 1564770499e1SDan Kimmel abd_t *cdata = abd_get_from_buf(cbuf, lsize); 1565770499e1SDan Kimmel abd_take_ownership_of_buf(cdata, B_TRUE); 1566770499e1SDan Kimmel abd_zero_off(cdata, psize, rounded - psize); 156781cd5c55SMatthew Ahrens psize = rounded; 1568770499e1SDan Kimmel zio_push_transform(zio, cdata, 15695d7b4d43SMatthew Ahrens psize, lsize, NULL); 15705d7b4d43SMatthew Ahrens } 1571e14bb325SJeff Bonwick } 15720f7643c7SGeorge Wilson 15730f7643c7SGeorge Wilson /* 15740f7643c7SGeorge Wilson * We were unable to handle this as an override bp, treat 15750f7643c7SGeorge Wilson * it as a regular write I/O. 15760f7643c7SGeorge Wilson */ 15770f7643c7SGeorge Wilson zio->io_bp_override = NULL; 15780f7643c7SGeorge Wilson *bp = zio->io_bp_orig; 15790f7643c7SGeorge Wilson zio->io_pipeline = zio->io_orig_pipeline; 1580eb633035STom Caputi 1581eb633035STom Caputi } else if ((zio->io_flags & ZIO_FLAG_RAW_ENCRYPT) != 0 && 1582eb633035STom Caputi zp->zp_type == DMU_OT_DNODE) { 1583eb633035STom Caputi /* 1584eb633035STom Caputi * The DMU actually relies on the zio layer's compression 1585eb633035STom Caputi * to free metadnode blocks that have had all contained 1586eb633035STom Caputi * dnodes freed. As a result, even when doing a raw 1587eb633035STom Caputi * receive, we must check whether the block can be compressed 1588eb633035STom Caputi * to a hole. 1589eb633035STom Caputi */ 1590eb633035STom Caputi psize = zio_compress_data(ZIO_COMPRESS_EMPTY, 1591eb633035STom Caputi zio->io_abd, NULL, lsize); 1592eb633035STom Caputi if (psize == 0) 1593eb633035STom Caputi compress = ZIO_COMPRESS_OFF; 15945602294fSDan Kimmel } else { 15955602294fSDan Kimmel ASSERT3U(psize, !=, 0); 1596e14bb325SJeff Bonwick } 1597c717a561Smaybee 1598e14bb325SJeff Bonwick /* 1599e14bb325SJeff Bonwick * The final pass of spa_sync() must be all rewrites, but the first 1600e14bb325SJeff Bonwick * few passes offer a trade-off: allocating blocks defers convergence, 1601e14bb325SJeff Bonwick * but newly allocated blocks are sequential, so they can be written 1602e14bb325SJeff Bonwick * to disk faster. Therefore, we allow the first few passes of 1603e14bb325SJeff Bonwick * spa_sync() to allocate new blocks, but force rewrites after that. 1604e14bb325SJeff Bonwick * There should only be a handful of blocks after pass 1 in any case. 1605e14bb325SJeff Bonwick */ 160643466aaeSMax Grossman if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg && 160743466aaeSMax Grossman BP_GET_PSIZE(bp) == psize && 160801f55e48SGeorge Wilson pass >= zfs_sync_pass_rewrite) { 1609663207adSDon Brady VERIFY3U(psize, !=, 0); 1610b24ab676SJeff Bonwick enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; 1611e14bb325SJeff Bonwick zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; 1612e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_REWRITE; 1613e14bb325SJeff Bonwick } else { 1614e14bb325SJeff Bonwick BP_ZERO(bp); 1615e14bb325SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 1616e14bb325SJeff Bonwick } 1617fa9e4066Sahrens 1618b24ab676SJeff Bonwick if (psize == 0) { 161943466aaeSMax Grossman if (zio->io_bp_orig.blk_birth != 0 && 162043466aaeSMax Grossman spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { 162143466aaeSMax Grossman BP_SET_LSIZE(bp, lsize); 162243466aaeSMax Grossman BP_SET_TYPE(bp, zp->zp_type); 162343466aaeSMax Grossman BP_SET_LEVEL(bp, zp->zp_level); 162443466aaeSMax Grossman BP_SET_BIRTH(bp, zio->io_txg, 0); 162543466aaeSMax Grossman } 1626e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1627e14bb325SJeff Bonwick } else { 1628e14bb325SJeff Bonwick ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); 1629e14bb325SJeff Bonwick BP_SET_LSIZE(bp, lsize); 163043466aaeSMax Grossman BP_SET_TYPE(bp, zp->zp_type); 163143466aaeSMax Grossman BP_SET_LEVEL(bp, zp->zp_level); 1632b24ab676SJeff Bonwick BP_SET_PSIZE(bp, psize); 1633e14bb325SJeff Bonwick BP_SET_COMPRESS(bp, compress); 1634e14bb325SJeff Bonwick BP_SET_CHECKSUM(bp, zp->zp_checksum); 1635b24ab676SJeff Bonwick BP_SET_DEDUP(bp, zp->zp_dedup); 1636e14bb325SJeff Bonwick BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 1637b24ab676SJeff Bonwick if (zp->zp_dedup) { 1638b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1639b24ab676SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 1640eb633035STom Caputi ASSERT(!zp->zp_encrypt || 1641eb633035STom Caputi DMU_OT_IS_ENCRYPTED(zp->zp_type)); 1642b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; 1643b24ab676SJeff Bonwick } 164480901aeaSGeorge Wilson if (zp->zp_nopwrite) { 164580901aeaSGeorge Wilson ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 164680901aeaSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 164780901aeaSGeorge Wilson zio->io_pipeline |= ZIO_STAGE_NOP_WRITE; 164880901aeaSGeorge Wilson } 1649b24ab676SJeff Bonwick } 1650b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1651b24ab676SJeff Bonwick } 1652b24ab676SJeff Bonwick 1653b24ab676SJeff Bonwick static int 1654b24ab676SJeff Bonwick zio_free_bp_init(zio_t *zio) 1655b24ab676SJeff Bonwick { 1656b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1657b24ab676SJeff Bonwick 1658b24ab676SJeff Bonwick if (zio->io_child_type == ZIO_CHILD_LOGICAL) { 1659b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp)) 1660b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; 1661e14bb325SJeff Bonwick } 1662fa9e4066Sahrens 16635cabbc6bSPrashanth Sreenivasa ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy); 16645cabbc6bSPrashanth Sreenivasa 1665e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1666fa9e4066Sahrens } 1667fa9e4066Sahrens 1668e14bb325SJeff Bonwick /* 1669e14bb325SJeff Bonwick * ========================================================================== 1670e14bb325SJeff Bonwick * Execute the I/O pipeline 1671e14bb325SJeff Bonwick * ========================================================================== 1672e14bb325SJeff Bonwick */ 1673e14bb325SJeff Bonwick 1674e14bb325SJeff Bonwick static void 1675ec94d322SAdam Leventhal zio_taskq_dispatch(zio_t *zio, zio_taskq_type_t q, boolean_t cutinline) 1676fa9e4066Sahrens { 167780eb36f2SGeorge Wilson spa_t *spa = zio->io_spa; 1678e14bb325SJeff Bonwick zio_type_t t = zio->io_type; 16795aeb9474SGarrett D'Amore int flags = (cutinline ? TQ_FRONT : 0); 16800a4e9518Sgw 16810a4e9518Sgw /* 1682bbe36defSGeorge Wilson * If we're a config writer or a probe, the normal issue and 1683bbe36defSGeorge Wilson * interrupt threads may all be blocked waiting for the config lock. 1684bbe36defSGeorge Wilson * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. 16850a4e9518Sgw */ 1686bbe36defSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) 1687e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 16880a4e9518Sgw 16890a4e9518Sgw /* 1690e14bb325SJeff Bonwick * A similar issue exists for the L2ARC write thread until L2ARC 2.0. 16910a4e9518Sgw */ 1692e14bb325SJeff Bonwick if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) 1693e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 16940a4e9518Sgw 169580eb36f2SGeorge Wilson /* 1696ec94d322SAdam Leventhal * If this is a high priority I/O, then use the high priority taskq if 1697ec94d322SAdam Leventhal * available. 169880eb36f2SGeorge Wilson */ 16992258ad0bSGeorge Wilson if ((zio->io_priority == ZIO_PRIORITY_NOW || 17002258ad0bSGeorge Wilson zio->io_priority == ZIO_PRIORITY_SYNC_WRITE) && 1701ec94d322SAdam Leventhal spa->spa_zio_taskq[t][q + 1].stqs_count != 0) 170280eb36f2SGeorge Wilson q++; 170380eb36f2SGeorge Wilson 170480eb36f2SGeorge Wilson ASSERT3U(q, <, ZIO_TASKQ_TYPES); 17055aeb9474SGarrett D'Amore 17065aeb9474SGarrett D'Amore /* 17075aeb9474SGarrett D'Amore * NB: We are assuming that the zio can only be dispatched 17085aeb9474SGarrett D'Amore * to a single taskq at a time. It would be a grievous error 17095aeb9474SGarrett D'Amore * to dispatch the zio to another taskq at the same time. 17105aeb9474SGarrett D'Amore */ 17115aeb9474SGarrett D'Amore ASSERT(zio->io_tqent.tqent_next == NULL); 1712ec94d322SAdam Leventhal spa_taskq_dispatch_ent(spa, t, q, (task_func_t *)zio_execute, zio, 1713ec94d322SAdam Leventhal flags, &zio->io_tqent); 1714e14bb325SJeff Bonwick } 17150a4e9518Sgw 1716e14bb325SJeff Bonwick static boolean_t 1717ec94d322SAdam Leventhal zio_taskq_member(zio_t *zio, zio_taskq_type_t q) 1718e14bb325SJeff Bonwick { 1719e14bb325SJeff Bonwick kthread_t *executor = zio->io_executor; 1720e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 17210a4e9518Sgw 1722ec94d322SAdam Leventhal for (zio_type_t t = 0; t < ZIO_TYPES; t++) { 1723ec94d322SAdam Leventhal spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 1724ec94d322SAdam Leventhal uint_t i; 1725ec94d322SAdam Leventhal for (i = 0; i < tqs->stqs_count; i++) { 1726ec94d322SAdam Leventhal if (taskq_member(tqs->stqs_taskq[i], executor)) 1727ec94d322SAdam Leventhal return (B_TRUE); 1728ec94d322SAdam Leventhal } 1729ec94d322SAdam Leventhal } 17300a4e9518Sgw 1731e14bb325SJeff Bonwick return (B_FALSE); 1732e14bb325SJeff Bonwick } 1733e05725b1Sbonwick 1734e14bb325SJeff Bonwick static int 1735e14bb325SJeff Bonwick zio_issue_async(zio_t *zio) 1736e14bb325SJeff Bonwick { 173735a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 1738e14bb325SJeff Bonwick 1739e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 17400a4e9518Sgw } 17410a4e9518Sgw 1742e14bb325SJeff Bonwick void 1743e14bb325SJeff Bonwick zio_interrupt(zio_t *zio) 17440a4e9518Sgw { 174535a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE); 1746e14bb325SJeff Bonwick } 17470a4e9518Sgw 174897e81309SPrakash Surya void 174997e81309SPrakash Surya zio_delay_interrupt(zio_t *zio) 175097e81309SPrakash Surya { 175197e81309SPrakash Surya /* 175297e81309SPrakash Surya * The timeout_generic() function isn't defined in userspace, so 175397e81309SPrakash Surya * rather than trying to implement the function, the zio delay 175497e81309SPrakash Surya * functionality has been disabled for userspace builds. 175597e81309SPrakash Surya */ 175697e81309SPrakash Surya 175797e81309SPrakash Surya #ifdef _KERNEL 175897e81309SPrakash Surya /* 175997e81309SPrakash Surya * If io_target_timestamp is zero, then no delay has been registered 176097e81309SPrakash Surya * for this IO, thus jump to the end of this function and "skip" the 176197e81309SPrakash Surya * delay; issuing it directly to the zio layer. 176297e81309SPrakash Surya */ 176397e81309SPrakash Surya if (zio->io_target_timestamp != 0) { 176497e81309SPrakash Surya hrtime_t now = gethrtime(); 176597e81309SPrakash Surya 176697e81309SPrakash Surya if (now >= zio->io_target_timestamp) { 176797e81309SPrakash Surya /* 176897e81309SPrakash Surya * This IO has already taken longer than the target 176997e81309SPrakash Surya * delay to complete, so we don't want to delay it 177097e81309SPrakash Surya * any longer; we "miss" the delay and issue it 177197e81309SPrakash Surya * directly to the zio layer. This is likely due to 177297e81309SPrakash Surya * the target latency being set to a value less than 177397e81309SPrakash Surya * the underlying hardware can satisfy (e.g. delay 177497e81309SPrakash Surya * set to 1ms, but the disks take 10ms to complete an 177597e81309SPrakash Surya * IO request). 177697e81309SPrakash Surya */ 177797e81309SPrakash Surya 177897e81309SPrakash Surya DTRACE_PROBE2(zio__delay__miss, zio_t *, zio, 177997e81309SPrakash Surya hrtime_t, now); 178097e81309SPrakash Surya 178197e81309SPrakash Surya zio_interrupt(zio); 178297e81309SPrakash Surya } else { 178397e81309SPrakash Surya hrtime_t diff = zio->io_target_timestamp - now; 178497e81309SPrakash Surya 178597e81309SPrakash Surya DTRACE_PROBE3(zio__delay__hit, zio_t *, zio, 178697e81309SPrakash Surya hrtime_t, now, hrtime_t, diff); 178797e81309SPrakash Surya 178897e81309SPrakash Surya (void) timeout_generic(CALLOUT_NORMAL, 178997e81309SPrakash Surya (void (*)(void *))zio_interrupt, zio, diff, 1, 0); 179097e81309SPrakash Surya } 179197e81309SPrakash Surya 179297e81309SPrakash Surya return; 179397e81309SPrakash Surya } 179497e81309SPrakash Surya #endif 179597e81309SPrakash Surya 179697e81309SPrakash Surya DTRACE_PROBE1(zio__delay__skip, zio_t *, zio); 179797e81309SPrakash Surya zio_interrupt(zio); 179897e81309SPrakash Surya } 179997e81309SPrakash Surya 1800e14bb325SJeff Bonwick /* 1801e14bb325SJeff Bonwick * Execute the I/O pipeline until one of the following occurs: 1802f7170741SWill Andrews * 1803f7170741SWill Andrews * (1) the I/O completes 1804f7170741SWill Andrews * (2) the pipeline stalls waiting for dependent child I/Os 1805f7170741SWill Andrews * (3) the I/O issues, so we're waiting for an I/O completion interrupt 1806f7170741SWill Andrews * (4) the I/O is delegated by vdev-level caching or aggregation 1807f7170741SWill Andrews * (5) the I/O is deferred due to vdev-level queueing 1808f7170741SWill Andrews * (6) the I/O is handed off to another thread. 1809f7170741SWill Andrews * 1810f7170741SWill Andrews * In all cases, the pipeline stops whenever there's no CPU work; it never 1811f7170741SWill Andrews * burns a thread in cv_wait(). 1812e14bb325SJeff Bonwick * 1813e14bb325SJeff Bonwick * There's no locking on io_stage because there's no legitimate way 1814e14bb325SJeff Bonwick * for multiple threads to be attempting to process the same I/O. 1815e14bb325SJeff Bonwick */ 1816b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[]; 18170a4e9518Sgw 1818e14bb325SJeff Bonwick void 1819e14bb325SJeff Bonwick zio_execute(zio_t *zio) 1820e14bb325SJeff Bonwick { 1821e14bb325SJeff Bonwick zio->io_executor = curthread; 18220a4e9518Sgw 18230f7643c7SGeorge Wilson ASSERT3U(zio->io_queued_timestamp, >, 0); 18240f7643c7SGeorge Wilson 1825e14bb325SJeff Bonwick while (zio->io_stage < ZIO_STAGE_DONE) { 1826b24ab676SJeff Bonwick enum zio_stage pipeline = zio->io_pipeline; 1827b24ab676SJeff Bonwick enum zio_stage stage = zio->io_stage; 1828e14bb325SJeff Bonwick int rv; 18290a4e9518Sgw 1830e14bb325SJeff Bonwick ASSERT(!MUTEX_HELD(&zio->io_lock)); 1831b24ab676SJeff Bonwick ASSERT(ISP2(stage)); 1832b24ab676SJeff Bonwick ASSERT(zio->io_stall == NULL); 18330a4e9518Sgw 1834b24ab676SJeff Bonwick do { 1835b24ab676SJeff Bonwick stage <<= 1; 1836b24ab676SJeff Bonwick } while ((stage & pipeline) == 0); 1837e14bb325SJeff Bonwick 1838e14bb325SJeff Bonwick ASSERT(stage <= ZIO_STAGE_DONE); 18390a4e9518Sgw 18400a4e9518Sgw /* 1841e14bb325SJeff Bonwick * If we are in interrupt context and this pipeline stage 1842e14bb325SJeff Bonwick * will grab a config lock that is held across I/O, 1843b24ab676SJeff Bonwick * or may wait for an I/O that needs an interrupt thread 1844b24ab676SJeff Bonwick * to complete, issue async to avoid deadlock. 184535a5a358SJonathan Adams * 184635a5a358SJonathan Adams * For VDEV_IO_START, we cut in line so that the io will 184735a5a358SJonathan Adams * be sent to disk promptly. 18480a4e9518Sgw */ 1849b24ab676SJeff Bonwick if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && 1850e14bb325SJeff Bonwick zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { 185135a5a358SJonathan Adams boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ? 185235a5a358SJonathan Adams zio_requeue_io_start_cut_in_line : B_FALSE; 185335a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); 1854e14bb325SJeff Bonwick return; 18550a4e9518Sgw } 18560a4e9518Sgw 1857*f6ef4223SJoshua M. Clulow #ifdef _KERNEL 1858*f6ef4223SJoshua M. Clulow /* 1859*f6ef4223SJoshua M. Clulow * The I/O pipeline is a part of the machinery responsible for 1860*f6ef4223SJoshua M. Clulow * evacuation of memory pages to disk when we are under 1861*f6ef4223SJoshua M. Clulow * sufficient memory pressure for pageout to run. By setting 1862*f6ef4223SJoshua M. Clulow * this flag, allocations may dip into pages in the pageout 1863*f6ef4223SJoshua M. Clulow * reserved pool in order to try to make forward progress. 1864*f6ef4223SJoshua M. Clulow */ 1865*f6ef4223SJoshua M. Clulow bool set_pushpage = false; 1866*f6ef4223SJoshua M. Clulow if (!(curthread->t_flag & T_PUSHPAGE)) { 1867*f6ef4223SJoshua M. Clulow /* 1868*f6ef4223SJoshua M. Clulow * We can be called recursively, so we need to remember 1869*f6ef4223SJoshua M. Clulow * if this frame was the one that first set the flag or 1870*f6ef4223SJoshua M. Clulow * not. 1871*f6ef4223SJoshua M. Clulow */ 1872*f6ef4223SJoshua M. Clulow set_pushpage = true; 1873*f6ef4223SJoshua M. Clulow curthread->t_flag |= T_PUSHPAGE; 1874*f6ef4223SJoshua M. Clulow } 1875*f6ef4223SJoshua M. Clulow #endif 1876*f6ef4223SJoshua M. Clulow 1877e14bb325SJeff Bonwick zio->io_stage = stage; 18780f7643c7SGeorge Wilson zio->io_pipeline_trace |= zio->io_stage; 1879bf16b11eSMatthew Ahrens rv = zio_pipeline[highbit64(stage) - 1](zio); 18800a4e9518Sgw 1881*f6ef4223SJoshua M. Clulow #ifdef _KERNEL 1882*f6ef4223SJoshua M. Clulow if (set_pushpage) { 1883*f6ef4223SJoshua M. Clulow curthread->t_flag &= ~T_PUSHPAGE; 1884*f6ef4223SJoshua M. Clulow } 1885*f6ef4223SJoshua M. Clulow #endif 1886*f6ef4223SJoshua M. Clulow 1887e14bb325SJeff Bonwick if (rv == ZIO_PIPELINE_STOP) 1888e14bb325SJeff Bonwick return; 18890a4e9518Sgw 1890e14bb325SJeff Bonwick ASSERT(rv == ZIO_PIPELINE_CONTINUE); 1891e14bb325SJeff Bonwick } 18920a4e9518Sgw } 18930a4e9518Sgw 1894e14bb325SJeff Bonwick /* 1895e14bb325SJeff Bonwick * ========================================================================== 1896e14bb325SJeff Bonwick * Initiate I/O, either sync or async 1897e14bb325SJeff Bonwick * ========================================================================== 1898e14bb325SJeff Bonwick */ 1899e14bb325SJeff Bonwick int 1900e14bb325SJeff Bonwick zio_wait(zio_t *zio) 19010a4e9518Sgw { 1902e14bb325SJeff Bonwick int error; 19030a4e9518Sgw 19041271e4b1SPrakash Surya ASSERT3P(zio->io_stage, ==, ZIO_STAGE_OPEN); 19051271e4b1SPrakash Surya ASSERT3P(zio->io_executor, ==, NULL); 19060a4e9518Sgw 1907e14bb325SJeff Bonwick zio->io_waiter = curthread; 19080f7643c7SGeorge Wilson ASSERT0(zio->io_queued_timestamp); 19090f7643c7SGeorge Wilson zio->io_queued_timestamp = gethrtime(); 1910e05725b1Sbonwick 1911e14bb325SJeff Bonwick zio_execute(zio); 19120a4e9518Sgw 1913e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 1914e14bb325SJeff Bonwick while (zio->io_executor != NULL) 1915e14bb325SJeff Bonwick cv_wait(&zio->io_cv, &zio->io_lock); 1916e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 191732b87932Sek 1918e14bb325SJeff Bonwick error = zio->io_error; 1919e14bb325SJeff Bonwick zio_destroy(zio); 192032b87932Sek 1921e14bb325SJeff Bonwick return (error); 192232b87932Sek } 192332b87932Sek 1924e14bb325SJeff Bonwick void 1925e14bb325SJeff Bonwick zio_nowait(zio_t *zio) 19260a4e9518Sgw { 19271271e4b1SPrakash Surya ASSERT3P(zio->io_executor, ==, NULL); 1928fa9e4066Sahrens 1929a3f829aeSBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL && 1930a3f829aeSBill Moore zio_unique_parent(zio) == NULL) { 1931ea8dc4b6Seschrock /* 1932e14bb325SJeff Bonwick * This is a logical async I/O with no parent to wait for it. 193354d692b7SGeorge Wilson * We add it to the spa_async_root_zio "Godfather" I/O which 193454d692b7SGeorge Wilson * will ensure they complete prior to unloading the pool. 1935ea8dc4b6Seschrock */ 1936e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 193754d692b7SGeorge Wilson 19386f834bc1SMatthew Ahrens zio_add_child(spa->spa_async_zio_root[CPU_SEQID], zio); 1939e14bb325SJeff Bonwick } 1940ea8dc4b6Seschrock 19410f7643c7SGeorge Wilson ASSERT0(zio->io_queued_timestamp); 19420f7643c7SGeorge Wilson zio->io_queued_timestamp = gethrtime(); 1943e14bb325SJeff Bonwick zio_execute(zio); 1944e14bb325SJeff Bonwick } 1945ea8dc4b6Seschrock 1946e14bb325SJeff Bonwick /* 1947e14bb325SJeff Bonwick * ========================================================================== 19481271e4b1SPrakash Surya * Reexecute, cancel, or suspend/resume failed I/O 1949e14bb325SJeff Bonwick * ========================================================================== 1950e14bb325SJeff Bonwick */ 1951fa9e4066Sahrens 1952e14bb325SJeff Bonwick static void 1953e14bb325SJeff Bonwick zio_reexecute(zio_t *pio) 1954e14bb325SJeff Bonwick { 1955a3f829aeSBill Moore zio_t *cio, *cio_next; 1956a3f829aeSBill Moore 1957a3f829aeSBill Moore ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); 1958a3f829aeSBill Moore ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); 1959f5383399SBill Moore ASSERT(pio->io_gang_leader == NULL); 1960f5383399SBill Moore ASSERT(pio->io_gang_tree == NULL); 1961e05725b1Sbonwick 1962e14bb325SJeff Bonwick pio->io_flags = pio->io_orig_flags; 1963e14bb325SJeff Bonwick pio->io_stage = pio->io_orig_stage; 1964e14bb325SJeff Bonwick pio->io_pipeline = pio->io_orig_pipeline; 1965e14bb325SJeff Bonwick pio->io_reexecute = 0; 196680901aeaSGeorge Wilson pio->io_flags |= ZIO_FLAG_REEXECUTED; 19670f7643c7SGeorge Wilson pio->io_pipeline_trace = 0; 1968e14bb325SJeff Bonwick pio->io_error = 0; 1969a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1970a3f829aeSBill Moore pio->io_state[w] = 0; 1971e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 1972e14bb325SJeff Bonwick pio->io_child_error[c] = 0; 19730a4e9518Sgw 1974b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(pio)) 1975b24ab676SJeff Bonwick BP_ZERO(pio->io_bp); 1976d58459f4Sek 1977e14bb325SJeff Bonwick /* 1978e14bb325SJeff Bonwick * As we reexecute pio's children, new children could be created. 1979a3f829aeSBill Moore * New children go to the head of pio's io_child_list, however, 1980e14bb325SJeff Bonwick * so we will (correctly) not reexecute them. The key is that 1981a3f829aeSBill Moore * the remainder of pio's io_child_list, from 'cio_next' onward, 1982a3f829aeSBill Moore * cannot be affected by any side effects of reexecuting 'cio'. 1983e14bb325SJeff Bonwick */ 19840f7643c7SGeorge Wilson zio_link_t *zl = NULL; 1985a3874b8bSToomas Soome mutex_enter(&pio->io_lock); 19860f7643c7SGeorge Wilson for (cio = zio_walk_children(pio, &zl); cio != NULL; cio = cio_next) { 19870f7643c7SGeorge Wilson cio_next = zio_walk_children(pio, &zl); 1988a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1989a3f829aeSBill Moore pio->io_children[cio->io_child_type][w]++; 1990e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 1991a3f829aeSBill Moore zio_reexecute(cio); 1992a3874b8bSToomas Soome mutex_enter(&pio->io_lock); 1993fa9e4066Sahrens } 1994a3874b8bSToomas Soome mutex_exit(&pio->io_lock); 1995e05725b1Sbonwick 1996e14bb325SJeff Bonwick /* 1997e14bb325SJeff Bonwick * Now that all children have been reexecuted, execute the parent. 199854d692b7SGeorge Wilson * We don't reexecute "The Godfather" I/O here as it's the 199948bbca81SDaniel Hoffman * responsibility of the caller to wait on it. 2000e14bb325SJeff Bonwick */ 20010f7643c7SGeorge Wilson if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) { 20020f7643c7SGeorge Wilson pio->io_queued_timestamp = gethrtime(); 200354d692b7SGeorge Wilson zio_execute(pio); 20040f7643c7SGeorge Wilson } 20050a4e9518Sgw } 20060a4e9518Sgw 2007e14bb325SJeff Bonwick void 2008e0f1c0afSOlaf Faaland zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t reason) 20090a4e9518Sgw { 2010e14bb325SJeff Bonwick if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) 2011e14bb325SJeff Bonwick fm_panic("Pool '%s' has encountered an uncorrectable I/O " 2012e14bb325SJeff Bonwick "failure and the failure mode property for this pool " 2013e14bb325SJeff Bonwick "is set to panic.", spa_name(spa)); 20140a4e9518Sgw 20158548ec78SJohn Levon cmn_err(CE_WARN, "Pool '%s' has encountered an uncorrectable I/O " 20168548ec78SJohn Levon "failure and has been suspended; `zpool clear` will be required " 20178548ec78SJohn Levon "before the pool can be written to.", spa_name(spa)); 20188548ec78SJohn Levon 20199b088140SToomas Soome (void) zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, 2020eb633035STom Caputi NULL, NULL, 0, 0); 20210a4e9518Sgw 2022e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 2023fa9e4066Sahrens 2024e14bb325SJeff Bonwick if (spa->spa_suspend_zio_root == NULL) 202554d692b7SGeorge Wilson spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, 202654d692b7SGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 202754d692b7SGeorge Wilson ZIO_FLAG_GODFATHER); 2028fa9e4066Sahrens 2029e0f1c0afSOlaf Faaland spa->spa_suspended = reason; 2030fa9e4066Sahrens 2031e14bb325SJeff Bonwick if (zio != NULL) { 203254d692b7SGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 2033e14bb325SJeff Bonwick ASSERT(zio != spa->spa_suspend_zio_root); 2034e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2035a3f829aeSBill Moore ASSERT(zio_unique_parent(zio) == NULL); 2036e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_DONE); 2037e14bb325SJeff Bonwick zio_add_child(spa->spa_suspend_zio_root, zio); 2038e14bb325SJeff Bonwick } 2039fa9e4066Sahrens 2040e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 2041e14bb325SJeff Bonwick } 2042fa9e4066Sahrens 204354d692b7SGeorge Wilson int 2044e14bb325SJeff Bonwick zio_resume(spa_t *spa) 2045e14bb325SJeff Bonwick { 204654d692b7SGeorge Wilson zio_t *pio; 2047fa9e4066Sahrens 2048b3995adbSahrens /* 2049e14bb325SJeff Bonwick * Reexecute all previously suspended i/o. 2050b3995adbSahrens */ 2051e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 2052e0f1c0afSOlaf Faaland spa->spa_suspended = ZIO_SUSPEND_NONE; 2053e14bb325SJeff Bonwick cv_broadcast(&spa->spa_suspend_cv); 2054e14bb325SJeff Bonwick pio = spa->spa_suspend_zio_root; 2055e14bb325SJeff Bonwick spa->spa_suspend_zio_root = NULL; 2056e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 2057e14bb325SJeff Bonwick 2058e14bb325SJeff Bonwick if (pio == NULL) 205954d692b7SGeorge Wilson return (0); 2060e14bb325SJeff Bonwick 206154d692b7SGeorge Wilson zio_reexecute(pio); 206254d692b7SGeorge Wilson return (zio_wait(pio)); 2063e14bb325SJeff Bonwick } 2064e14bb325SJeff Bonwick 2065e14bb325SJeff Bonwick void 2066e14bb325SJeff Bonwick zio_resume_wait(spa_t *spa) 2067e14bb325SJeff Bonwick { 2068e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 2069e14bb325SJeff Bonwick while (spa_suspended(spa)) 2070e14bb325SJeff Bonwick cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); 2071e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 2072fa9e4066Sahrens } 2073fa9e4066Sahrens 2074fa9e4066Sahrens /* 2075fa9e4066Sahrens * ========================================================================== 2076e14bb325SJeff Bonwick * Gang blocks. 2077e14bb325SJeff Bonwick * 2078e14bb325SJeff Bonwick * A gang block is a collection of small blocks that looks to the DMU 2079e14bb325SJeff Bonwick * like one large block. When zio_dva_allocate() cannot find a block 2080e14bb325SJeff Bonwick * of the requested size, due to either severe fragmentation or the pool 2081e14bb325SJeff Bonwick * being nearly full, it calls zio_write_gang_block() to construct the 2082e14bb325SJeff Bonwick * block from smaller fragments. 2083e14bb325SJeff Bonwick * 2084e14bb325SJeff Bonwick * A gang block consists of a gang header (zio_gbh_phys_t) and up to 2085e14bb325SJeff Bonwick * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like 2086e14bb325SJeff Bonwick * an indirect block: it's an array of block pointers. It consumes 2087e14bb325SJeff Bonwick * only one sector and hence is allocatable regardless of fragmentation. 2088e14bb325SJeff Bonwick * The gang header's bps point to its gang members, which hold the data. 2089e14bb325SJeff Bonwick * 2090e14bb325SJeff Bonwick * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> 2091e14bb325SJeff Bonwick * as the verifier to ensure uniqueness of the SHA256 checksum. 2092e14bb325SJeff Bonwick * Critically, the gang block bp's blk_cksum is the checksum of the data, 2093e14bb325SJeff Bonwick * not the gang header. This ensures that data block signatures (needed for 2094e14bb325SJeff Bonwick * deduplication) are independent of how the block is physically stored. 2095e14bb325SJeff Bonwick * 2096e14bb325SJeff Bonwick * Gang blocks can be nested: a gang member may itself be a gang block. 2097e14bb325SJeff Bonwick * Thus every gang block is a tree in which root and all interior nodes are 2098e14bb325SJeff Bonwick * gang headers, and the leaves are normal blocks that contain user data. 2099e14bb325SJeff Bonwick * The root of the gang tree is called the gang leader. 2100e14bb325SJeff Bonwick * 2101e14bb325SJeff Bonwick * To perform any operation (read, rewrite, free, claim) on a gang block, 2102e14bb325SJeff Bonwick * zio_gang_assemble() first assembles the gang tree (minus data leaves) 2103e14bb325SJeff Bonwick * in the io_gang_tree field of the original logical i/o by recursively 2104e14bb325SJeff Bonwick * reading the gang leader and all gang headers below it. This yields 2105e14bb325SJeff Bonwick * an in-core tree containing the contents of every gang header and the 2106e14bb325SJeff Bonwick * bps for every constituent of the gang block. 2107e14bb325SJeff Bonwick * 2108e14bb325SJeff Bonwick * With the gang tree now assembled, zio_gang_issue() just walks the gang tree 2109e14bb325SJeff Bonwick * and invokes a callback on each bp. To free a gang block, zio_gang_issue() 2110e14bb325SJeff Bonwick * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. 2111e14bb325SJeff Bonwick * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). 2112e14bb325SJeff Bonwick * zio_read_gang() is a wrapper around zio_read() that omits reading gang 2113e14bb325SJeff Bonwick * headers, since we already have those in io_gang_tree. zio_rewrite_gang() 2114e14bb325SJeff Bonwick * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() 2115e14bb325SJeff Bonwick * of the gang header plus zio_checksum_compute() of the data to update the 2116e14bb325SJeff Bonwick * gang header's blk_cksum as described above. 2117e14bb325SJeff Bonwick * 2118e14bb325SJeff Bonwick * The two-phase assemble/issue model solves the problem of partial failure -- 2119e14bb325SJeff Bonwick * what if you'd freed part of a gang block but then couldn't read the 2120e14bb325SJeff Bonwick * gang header for another part? Assembling the entire gang tree first 2121e14bb325SJeff Bonwick * ensures that all the necessary gang header I/O has succeeded before 2122e14bb325SJeff Bonwick * starting the actual work of free, claim, or write. Once the gang tree 2123e14bb325SJeff Bonwick * is assembled, free and claim are in-memory operations that cannot fail. 2124e14bb325SJeff Bonwick * 2125e14bb325SJeff Bonwick * In the event that a gang write fails, zio_dva_unallocate() walks the 2126e14bb325SJeff Bonwick * gang tree to immediately free (i.e. insert back into the space map) 2127e14bb325SJeff Bonwick * everything we've allocated. This ensures that we don't get ENOSPC 2128e14bb325SJeff Bonwick * errors during repeated suspend/resume cycles due to a flaky device. 2129e14bb325SJeff Bonwick * 2130e14bb325SJeff Bonwick * Gang rewrites only happen during sync-to-convergence. If we can't assemble 2131e14bb325SJeff Bonwick * the gang tree, we won't modify the block, so we can safely defer the free 2132e14bb325SJeff Bonwick * (knowing that the block is still intact). If we *can* assemble the gang 2133e14bb325SJeff Bonwick * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free 2134e14bb325SJeff Bonwick * each constituent bp and we can allocate a new block on the next sync pass. 2135e14bb325SJeff Bonwick * 2136e14bb325SJeff Bonwick * In all cases, the gang tree allows complete recovery from partial failure. 2137fa9e4066Sahrens * ========================================================================== 2138fa9e4066Sahrens */ 2139e14bb325SJeff Bonwick 2140770499e1SDan Kimmel static void 2141770499e1SDan Kimmel zio_gang_issue_func_done(zio_t *zio) 2142770499e1SDan Kimmel { 2143770499e1SDan Kimmel abd_put(zio->io_abd); 2144770499e1SDan Kimmel } 2145770499e1SDan Kimmel 2146e14bb325SJeff Bonwick static zio_t * 2147770499e1SDan Kimmel zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data, 2148770499e1SDan Kimmel uint64_t offset) 2149fa9e4066Sahrens { 2150e14bb325SJeff Bonwick if (gn != NULL) 2151e14bb325SJeff Bonwick return (pio); 2152fa9e4066Sahrens 2153770499e1SDan Kimmel return (zio_read(pio, pio->io_spa, bp, abd_get_offset(data, offset), 2154770499e1SDan Kimmel BP_GET_PSIZE(bp), zio_gang_issue_func_done, 2155770499e1SDan Kimmel NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 2156e14bb325SJeff Bonwick &pio->io_bookmark)); 2157e14bb325SJeff Bonwick } 2158e14bb325SJeff Bonwick 2159770499e1SDan Kimmel static zio_t * 2160770499e1SDan Kimmel zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data, 2161770499e1SDan Kimmel uint64_t offset) 2162e14bb325SJeff Bonwick { 2163e14bb325SJeff Bonwick zio_t *zio; 2164e14bb325SJeff Bonwick 2165e14bb325SJeff Bonwick if (gn != NULL) { 2166770499e1SDan Kimmel abd_t *gbh_abd = 2167770499e1SDan Kimmel abd_get_from_buf(gn->gn_gbh, SPA_GANGBLOCKSIZE); 2168e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 2169770499e1SDan Kimmel gbh_abd, SPA_GANGBLOCKSIZE, zio_gang_issue_func_done, NULL, 2170770499e1SDan Kimmel pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 2171770499e1SDan Kimmel &pio->io_bookmark); 2172fa9e4066Sahrens /* 2173e14bb325SJeff Bonwick * As we rewrite each gang header, the pipeline will compute 2174e14bb325SJeff Bonwick * a new gang block header checksum for it; but no one will 2175e14bb325SJeff Bonwick * compute a new data checksum, so we do that here. The one 2176e14bb325SJeff Bonwick * exception is the gang leader: the pipeline already computed 2177e14bb325SJeff Bonwick * its data checksum because that stage precedes gang assembly. 2178e14bb325SJeff Bonwick * (Presently, nothing actually uses interior data checksums; 2179e14bb325SJeff Bonwick * this is just good hygiene.) 2180fa9e4066Sahrens */ 2181f5383399SBill Moore if (gn != pio->io_gang_leader->io_gang_tree) { 2182770499e1SDan Kimmel abd_t *buf = abd_get_offset(data, offset); 2183770499e1SDan Kimmel 2184e14bb325SJeff Bonwick zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), 2185770499e1SDan Kimmel buf, BP_GET_PSIZE(bp)); 2186770499e1SDan Kimmel 2187770499e1SDan Kimmel abd_put(buf); 2188e14bb325SJeff Bonwick } 2189b24ab676SJeff Bonwick /* 2190b24ab676SJeff Bonwick * If we are here to damage data for testing purposes, 2191b24ab676SJeff Bonwick * leave the GBH alone so that we can detect the damage. 2192b24ab676SJeff Bonwick */ 2193b24ab676SJeff Bonwick if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) 2194b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 2195fa9e4066Sahrens } else { 2196e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 2197770499e1SDan Kimmel abd_get_offset(data, offset), BP_GET_PSIZE(bp), 2198770499e1SDan Kimmel zio_gang_issue_func_done, NULL, pio->io_priority, 2199e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 2200fa9e4066Sahrens } 2201fa9e4066Sahrens 2202e14bb325SJeff Bonwick return (zio); 2203e14bb325SJeff Bonwick } 2204fa9e4066Sahrens 2205e14bb325SJeff Bonwick /* ARGSUSED */ 2206770499e1SDan Kimmel static zio_t * 2207770499e1SDan Kimmel zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data, 2208770499e1SDan Kimmel uint64_t offset) 2209e14bb325SJeff Bonwick { 2210b24ab676SJeff Bonwick return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, 2211b24ab676SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio))); 2212fa9e4066Sahrens } 2213fa9e4066Sahrens 2214e14bb325SJeff Bonwick /* ARGSUSED */ 2215770499e1SDan Kimmel static zio_t * 2216770499e1SDan Kimmel zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data, 2217770499e1SDan Kimmel uint64_t offset) 2218fa9e4066Sahrens { 2219e14bb325SJeff Bonwick return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, 2220e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 2221e14bb325SJeff Bonwick } 2222fa9e4066Sahrens 2223e14bb325SJeff Bonwick static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { 2224e14bb325SJeff Bonwick NULL, 2225e14bb325SJeff Bonwick zio_read_gang, 2226e14bb325SJeff Bonwick zio_rewrite_gang, 2227e14bb325SJeff Bonwick zio_free_gang, 2228e14bb325SJeff Bonwick zio_claim_gang, 2229e14bb325SJeff Bonwick NULL 2230e14bb325SJeff Bonwick }; 2231fa9e4066Sahrens 2232e14bb325SJeff Bonwick static void zio_gang_tree_assemble_done(zio_t *zio); 2233fa9e4066Sahrens 2234e14bb325SJeff Bonwick static zio_gang_node_t * 2235e14bb325SJeff Bonwick zio_gang_node_alloc(zio_gang_node_t **gnpp) 2236e14bb325SJeff Bonwick { 2237e14bb325SJeff Bonwick zio_gang_node_t *gn; 2238fa9e4066Sahrens 2239e14bb325SJeff Bonwick ASSERT(*gnpp == NULL); 2240fa9e4066Sahrens 2241e14bb325SJeff Bonwick gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); 2242e14bb325SJeff Bonwick gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); 2243e14bb325SJeff Bonwick *gnpp = gn; 2244e14bb325SJeff Bonwick 2245e14bb325SJeff Bonwick return (gn); 2246fa9e4066Sahrens } 2247fa9e4066Sahrens 2248fa9e4066Sahrens static void 2249e14bb325SJeff Bonwick zio_gang_node_free(zio_gang_node_t **gnpp) 2250fa9e4066Sahrens { 2251e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 2252fa9e4066Sahrens 2253e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 2254e14bb325SJeff Bonwick ASSERT(gn->gn_child[g] == NULL); 2255e14bb325SJeff Bonwick 2256e14bb325SJeff Bonwick zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); 2257e14bb325SJeff Bonwick kmem_free(gn, sizeof (*gn)); 2258e14bb325SJeff Bonwick *gnpp = NULL; 2259fa9e4066Sahrens } 2260fa9e4066Sahrens 2261e14bb325SJeff Bonwick static void 2262e14bb325SJeff Bonwick zio_gang_tree_free(zio_gang_node_t **gnpp) 2263fa9e4066Sahrens { 2264e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 2265fa9e4066Sahrens 2266e14bb325SJeff Bonwick if (gn == NULL) 2267e14bb325SJeff Bonwick return; 2268fa9e4066Sahrens 2269e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 2270e14bb325SJeff Bonwick zio_gang_tree_free(&gn->gn_child[g]); 2271fa9e4066Sahrens 2272e14bb325SJeff Bonwick zio_gang_node_free(gnpp); 2273fa9e4066Sahrens } 2274fa9e4066Sahrens 2275e14bb325SJeff Bonwick static void 2276f5383399SBill Moore zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) 2277fa9e4066Sahrens { 2278e14bb325SJeff Bonwick zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); 2279770499e1SDan Kimmel abd_t *gbh_abd = abd_get_from_buf(gn->gn_gbh, SPA_GANGBLOCKSIZE); 2280e14bb325SJeff Bonwick 2281f5383399SBill Moore ASSERT(gio->io_gang_leader == gio); 2282e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp)); 2283fa9e4066Sahrens 2284770499e1SDan Kimmel zio_nowait(zio_read(gio, gio->io_spa, bp, gbh_abd, SPA_GANGBLOCKSIZE, 2285770499e1SDan Kimmel zio_gang_tree_assemble_done, gn, gio->io_priority, 2286770499e1SDan Kimmel ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); 2287e14bb325SJeff Bonwick } 2288fa9e4066Sahrens 2289e14bb325SJeff Bonwick static void 2290e14bb325SJeff Bonwick zio_gang_tree_assemble_done(zio_t *zio) 2291e14bb325SJeff Bonwick { 2292f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 2293e14bb325SJeff Bonwick zio_gang_node_t *gn = zio->io_private; 2294e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2295fa9e4066Sahrens 2296f5383399SBill Moore ASSERT(gio == zio_unique_parent(zio)); 2297b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 2298fa9e4066Sahrens 2299e14bb325SJeff Bonwick if (zio->io_error) 2300e14bb325SJeff Bonwick return; 2301fa9e4066Sahrens 2302770499e1SDan Kimmel /* this ABD was created from a linear buf in zio_gang_tree_assemble */ 2303e14bb325SJeff Bonwick if (BP_SHOULD_BYTESWAP(bp)) 2304770499e1SDan Kimmel byteswap_uint64_array(abd_to_buf(zio->io_abd), zio->io_size); 2305fa9e4066Sahrens 2306770499e1SDan Kimmel ASSERT3P(abd_to_buf(zio->io_abd), ==, gn->gn_gbh); 2307e14bb325SJeff Bonwick ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); 23086e1f5caaSNeil Perrin ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); 2309e05725b1Sbonwick 2310770499e1SDan Kimmel abd_put(zio->io_abd); 2311770499e1SDan Kimmel 2312e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 2313e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 2314e14bb325SJeff Bonwick if (!BP_IS_GANG(gbp)) 2315e14bb325SJeff Bonwick continue; 2316f5383399SBill Moore zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); 2317e14bb325SJeff Bonwick } 2318fa9e4066Sahrens } 2319fa9e4066Sahrens 2320e14bb325SJeff Bonwick static void 2321770499e1SDan Kimmel zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, abd_t *data, 2322770499e1SDan Kimmel uint64_t offset) 2323fa9e4066Sahrens { 2324f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 2325e14bb325SJeff Bonwick zio_t *zio; 2326fa9e4066Sahrens 2327e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) == !!gn); 2328f5383399SBill Moore ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); 2329f5383399SBill Moore ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); 2330fa9e4066Sahrens 2331e14bb325SJeff Bonwick /* 2332e14bb325SJeff Bonwick * If you're a gang header, your data is in gn->gn_gbh. 2333e14bb325SJeff Bonwick * If you're a gang member, your data is in 'data' and gn == NULL. 2334e14bb325SJeff Bonwick */ 2335770499e1SDan Kimmel zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data, offset); 2336fa9e4066Sahrens 2337e14bb325SJeff Bonwick if (gn != NULL) { 23386e1f5caaSNeil Perrin ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); 2339fa9e4066Sahrens 2340e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 2341e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 2342e14bb325SJeff Bonwick if (BP_IS_HOLE(gbp)) 2343e14bb325SJeff Bonwick continue; 2344770499e1SDan Kimmel zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data, 2345770499e1SDan Kimmel offset); 2346770499e1SDan Kimmel offset += BP_GET_PSIZE(gbp); 2347e14bb325SJeff Bonwick } 2348fa9e4066Sahrens } 2349fa9e4066Sahrens 2350f5383399SBill Moore if (gn == gio->io_gang_tree) 2351770499e1SDan Kimmel ASSERT3U(gio->io_size, ==, offset); 2352e05725b1Sbonwick 2353e14bb325SJeff Bonwick if (zio != pio) 2354e14bb325SJeff Bonwick zio_nowait(zio); 2355fa9e4066Sahrens } 2356fa9e4066Sahrens 2357e05725b1Sbonwick static int 2358e14bb325SJeff Bonwick zio_gang_assemble(zio_t *zio) 2359fa9e4066Sahrens { 2360e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2361fa9e4066Sahrens 2362f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); 2363f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 2364f5383399SBill Moore 2365f5383399SBill Moore zio->io_gang_leader = zio; 2366fa9e4066Sahrens 2367e14bb325SJeff Bonwick zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); 2368e05725b1Sbonwick 2369e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2370fa9e4066Sahrens } 2371fa9e4066Sahrens 2372e05725b1Sbonwick static int 2373e14bb325SJeff Bonwick zio_gang_issue(zio_t *zio) 2374fa9e4066Sahrens { 2375e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2376fa9e4066Sahrens 2377d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_GANG_BIT, ZIO_WAIT_DONE)) { 2378e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2379d6e1c446SGeorge Wilson } 2380fa9e4066Sahrens 2381f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); 2382f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 2383fa9e4066Sahrens 2384e14bb325SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_GANG] == 0) 2385770499e1SDan Kimmel zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_abd, 2386770499e1SDan Kimmel 0); 2387e14bb325SJeff Bonwick else 2388f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 2389fa9e4066Sahrens 2390e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2391e05725b1Sbonwick 2392e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2393fa9e4066Sahrens } 2394fa9e4066Sahrens 2395fa9e4066Sahrens static void 2396e14bb325SJeff Bonwick zio_write_gang_member_ready(zio_t *zio) 2397fa9e4066Sahrens { 2398a3f829aeSBill Moore zio_t *pio = zio_unique_parent(zio); 2399f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 240044cd46caSbillm dva_t *cdva = zio->io_bp->blk_dva; 240144cd46caSbillm dva_t *pdva = pio->io_bp->blk_dva; 2402fa9e4066Sahrens uint64_t asize; 2403fa9e4066Sahrens 2404e14bb325SJeff Bonwick if (BP_IS_HOLE(zio->io_bp)) 2405e14bb325SJeff Bonwick return; 2406e14bb325SJeff Bonwick 2407e14bb325SJeff Bonwick ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); 2408e14bb325SJeff Bonwick 2409e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_GANG); 2410b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); 2411b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); 2412b24ab676SJeff Bonwick ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); 241344cd46caSbillm ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); 2414fa9e4066Sahrens 2415fa9e4066Sahrens mutex_enter(&pio->io_lock); 2416e14bb325SJeff Bonwick for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { 241744cd46caSbillm ASSERT(DVA_GET_GANG(&pdva[d])); 241844cd46caSbillm asize = DVA_GET_ASIZE(&pdva[d]); 241944cd46caSbillm asize += DVA_GET_ASIZE(&cdva[d]); 242044cd46caSbillm DVA_SET_ASIZE(&pdva[d], asize); 242144cd46caSbillm } 2422fa9e4066Sahrens mutex_exit(&pio->io_lock); 2423fa9e4066Sahrens } 2424fa9e4066Sahrens 2425770499e1SDan Kimmel static void 2426770499e1SDan Kimmel zio_write_gang_done(zio_t *zio) 2427770499e1SDan Kimmel { 24287341a7deSBrad Lewis /* 24297341a7deSBrad Lewis * The io_abd field will be NULL for a zio with no data. The io_flags 24307341a7deSBrad Lewis * will initially have the ZIO_FLAG_NODATA bit flag set, but we can't 24317341a7deSBrad Lewis * check for it here as it is cleared in zio_ready. 24327341a7deSBrad Lewis */ 24337341a7deSBrad Lewis if (zio->io_abd != NULL) 24347341a7deSBrad Lewis abd_put(zio->io_abd); 2435770499e1SDan Kimmel } 2436770499e1SDan Kimmel 24370a4e9518Sgw static int 2438e14bb325SJeff Bonwick zio_write_gang_block(zio_t *pio) 2439fa9e4066Sahrens { 2440e14bb325SJeff Bonwick spa_t *spa = pio->io_spa; 24410f7643c7SGeorge Wilson metaslab_class_t *mc = spa_normal_class(spa); 2442e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 2443f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 2444e14bb325SJeff Bonwick zio_t *zio; 2445e14bb325SJeff Bonwick zio_gang_node_t *gn, **gnpp; 2446fa9e4066Sahrens zio_gbh_phys_t *gbh; 2447770499e1SDan Kimmel abd_t *gbh_abd; 2448e14bb325SJeff Bonwick uint64_t txg = pio->io_txg; 2449e14bb325SJeff Bonwick uint64_t resid = pio->io_size; 2450e14bb325SJeff Bonwick uint64_t lsize; 2451b24ab676SJeff Bonwick int copies = gio->io_prop.zp_copies; 2452b24ab676SJeff Bonwick int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); 2453e14bb325SJeff Bonwick zio_prop_t zp; 2454fa9e4066Sahrens int error; 24557341a7deSBrad Lewis boolean_t has_data = !(pio->io_flags & ZIO_FLAG_NODATA); 2456fa9e4066Sahrens 2457eb633035STom Caputi /* 2458eb633035STom Caputi * encrypted blocks need DVA[2] free so encrypted gang headers can't 2459eb633035STom Caputi * have a third copy. 2460eb633035STom Caputi */ 2461eb633035STom Caputi if (gio->io_prop.zp_encrypt && gbh_copies >= SPA_DVAS_PER_BP) 2462eb633035STom Caputi gbh_copies = SPA_DVAS_PER_BP - 1; 2463eb633035STom Caputi 24640f7643c7SGeorge Wilson int flags = METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER; 24650f7643c7SGeorge Wilson if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) { 24660f7643c7SGeorge Wilson ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); 24677341a7deSBrad Lewis ASSERT(has_data); 24680f7643c7SGeorge Wilson 24690f7643c7SGeorge Wilson flags |= METASLAB_ASYNC_ALLOC; 2470e914ace2STim Schumacher VERIFY(zfs_refcount_held(&mc->mc_alloc_slots[pio->io_allocator], 2471f78cdc34SPaul Dagnelie pio)); 24720f7643c7SGeorge Wilson 24730f7643c7SGeorge Wilson /* 24740f7643c7SGeorge Wilson * The logical zio has already placed a reservation for 24750f7643c7SGeorge Wilson * 'copies' allocation slots but gang blocks may require 24760f7643c7SGeorge Wilson * additional copies. These additional copies 24770f7643c7SGeorge Wilson * (i.e. gbh_copies - copies) are guaranteed to succeed 24780f7643c7SGeorge Wilson * since metaslab_class_throttle_reserve() always allows 24790f7643c7SGeorge Wilson * additional reservations for gang blocks. 24800f7643c7SGeorge Wilson */ 24810f7643c7SGeorge Wilson VERIFY(metaslab_class_throttle_reserve(mc, gbh_copies - copies, 2482f78cdc34SPaul Dagnelie pio->io_allocator, pio, flags)); 24830f7643c7SGeorge Wilson } 24840f7643c7SGeorge Wilson 24850f7643c7SGeorge Wilson error = metaslab_alloc(spa, mc, SPA_GANGBLOCKSIZE, 24868363e80aSGeorge Wilson bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, flags, 2487f78cdc34SPaul Dagnelie &pio->io_alloc_list, pio, pio->io_allocator); 2488e05725b1Sbonwick if (error) { 24890f7643c7SGeorge Wilson if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) { 24900f7643c7SGeorge Wilson ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); 24917341a7deSBrad Lewis ASSERT(has_data); 24920f7643c7SGeorge Wilson 24930f7643c7SGeorge Wilson /* 24940f7643c7SGeorge Wilson * If we failed to allocate the gang block header then 24950f7643c7SGeorge Wilson * we remove any additional allocation reservations that 24960f7643c7SGeorge Wilson * we placed here. The original reservation will 24970f7643c7SGeorge Wilson * be removed when the logical I/O goes to the ready 24980f7643c7SGeorge Wilson * stage. 24990f7643c7SGeorge Wilson */ 25000f7643c7SGeorge Wilson metaslab_class_throttle_unreserve(mc, 2501f78cdc34SPaul Dagnelie gbh_copies - copies, pio->io_allocator, pio); 25020f7643c7SGeorge Wilson } 2503e14bb325SJeff Bonwick pio->io_error = error; 2504e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2505e05725b1Sbonwick } 2506fa9e4066Sahrens 2507f5383399SBill Moore if (pio == gio) { 2508f5383399SBill Moore gnpp = &gio->io_gang_tree; 2509e14bb325SJeff Bonwick } else { 2510e14bb325SJeff Bonwick gnpp = pio->io_private; 2511e14bb325SJeff Bonwick ASSERT(pio->io_ready == zio_write_gang_member_ready); 2512fa9e4066Sahrens } 2513fa9e4066Sahrens 2514e14bb325SJeff Bonwick gn = zio_gang_node_alloc(gnpp); 2515e14bb325SJeff Bonwick gbh = gn->gn_gbh; 2516e14bb325SJeff Bonwick bzero(gbh, SPA_GANGBLOCKSIZE); 2517770499e1SDan Kimmel gbh_abd = abd_get_from_buf(gbh, SPA_GANGBLOCKSIZE); 2518fa9e4066Sahrens 2519e14bb325SJeff Bonwick /* 2520e14bb325SJeff Bonwick * Create the gang header. 2521e14bb325SJeff Bonwick */ 2522770499e1SDan Kimmel zio = zio_rewrite(pio, spa, txg, bp, gbh_abd, SPA_GANGBLOCKSIZE, 2523770499e1SDan Kimmel zio_write_gang_done, NULL, pio->io_priority, 2524770499e1SDan Kimmel ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 2525fa9e4066Sahrens 2526e14bb325SJeff Bonwick /* 2527e14bb325SJeff Bonwick * Create and nowait the gang children. 2528e14bb325SJeff Bonwick */ 2529e14bb325SJeff Bonwick for (int g = 0; resid != 0; resid -= lsize, g++) { 2530e14bb325SJeff Bonwick lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), 2531e14bb325SJeff Bonwick SPA_MINBLOCKSIZE); 2532e14bb325SJeff Bonwick ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); 2533e14bb325SJeff Bonwick 2534f5383399SBill Moore zp.zp_checksum = gio->io_prop.zp_checksum; 2535e14bb325SJeff Bonwick zp.zp_compress = ZIO_COMPRESS_OFF; 2536e14bb325SJeff Bonwick zp.zp_type = DMU_OT_NONE; 2537e14bb325SJeff Bonwick zp.zp_level = 0; 2538b24ab676SJeff Bonwick zp.zp_copies = gio->io_prop.zp_copies; 253980901aeaSGeorge Wilson zp.zp_dedup = B_FALSE; 254080901aeaSGeorge Wilson zp.zp_dedup_verify = B_FALSE; 254180901aeaSGeorge Wilson zp.zp_nopwrite = B_FALSE; 2542eb633035STom Caputi zp.zp_encrypt = gio->io_prop.zp_encrypt; 2543eb633035STom Caputi zp.zp_byteorder = gio->io_prop.zp_byteorder; 2544eb633035STom Caputi bzero(zp.zp_salt, ZIO_DATA_SALT_LEN); 2545eb633035STom Caputi bzero(zp.zp_iv, ZIO_DATA_IV_LEN); 2546eb633035STom Caputi bzero(zp.zp_mac, ZIO_DATA_MAC_LEN); 2547e14bb325SJeff Bonwick 25480f7643c7SGeorge Wilson zio_t *cio = zio_write(zio, spa, txg, &gbh->zg_blkptr[g], 25497341a7deSBrad Lewis has_data ? abd_get_offset(pio->io_abd, pio->io_size - 25507341a7deSBrad Lewis resid) : NULL, lsize, lsize, &zp, 25517341a7deSBrad Lewis zio_write_gang_member_ready, NULL, NULL, 2552770499e1SDan Kimmel zio_write_gang_done, &gn->gn_child[g], pio->io_priority, 25530f7643c7SGeorge Wilson ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 25540f7643c7SGeorge Wilson 25550f7643c7SGeorge Wilson if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) { 25560f7643c7SGeorge Wilson ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); 25577341a7deSBrad Lewis ASSERT(has_data); 25580f7643c7SGeorge Wilson 25590f7643c7SGeorge Wilson /* 25600f7643c7SGeorge Wilson * Gang children won't throttle but we should 25610f7643c7SGeorge Wilson * account for their work, so reserve an allocation 25620f7643c7SGeorge Wilson * slot for them here. 25630f7643c7SGeorge Wilson */ 25640f7643c7SGeorge Wilson VERIFY(metaslab_class_throttle_reserve(mc, 2565f78cdc34SPaul Dagnelie zp.zp_copies, cio->io_allocator, cio, flags)); 25660f7643c7SGeorge Wilson } 25670f7643c7SGeorge Wilson zio_nowait(cio); 2568e14bb325SJeff Bonwick } 2569e05725b1Sbonwick 257044cd46caSbillm /* 2571e14bb325SJeff Bonwick * Set pio's pipeline to just wait for zio to finish. 257244cd46caSbillm */ 2573e14bb325SJeff Bonwick pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2574e14bb325SJeff Bonwick 2575e14bb325SJeff Bonwick zio_nowait(zio); 2576e14bb325SJeff Bonwick 2577e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2578fa9e4066Sahrens } 2579fa9e4066Sahrens 258080901aeaSGeorge Wilson /* 258145818ee1SMatthew Ahrens * The zio_nop_write stage in the pipeline determines if allocating a 258245818ee1SMatthew Ahrens * new bp is necessary. The nopwrite feature can handle writes in 258345818ee1SMatthew Ahrens * either syncing or open context (i.e. zil writes) and as a result is 258445818ee1SMatthew Ahrens * mutually exclusive with dedup. 258545818ee1SMatthew Ahrens * 258645818ee1SMatthew Ahrens * By leveraging a cryptographically secure checksum, such as SHA256, we 258745818ee1SMatthew Ahrens * can compare the checksums of the new data and the old to determine if 258845818ee1SMatthew Ahrens * allocating a new block is required. Note that our requirements for 258945818ee1SMatthew Ahrens * cryptographic strength are fairly weak: there can't be any accidental 259045818ee1SMatthew Ahrens * hash collisions, but we don't need to be secure against intentional 259145818ee1SMatthew Ahrens * (malicious) collisions. To trigger a nopwrite, you have to be able 259245818ee1SMatthew Ahrens * to write the file to begin with, and triggering an incorrect (hash 259345818ee1SMatthew Ahrens * collision) nopwrite is no worse than simply writing to the file. 259445818ee1SMatthew Ahrens * That said, there are no known attacks against the checksum algorithms 259545818ee1SMatthew Ahrens * used for nopwrite, assuming that the salt and the checksums 259645818ee1SMatthew Ahrens * themselves remain secret. 259780901aeaSGeorge Wilson */ 259880901aeaSGeorge Wilson static int 259980901aeaSGeorge Wilson zio_nop_write(zio_t *zio) 260080901aeaSGeorge Wilson { 260180901aeaSGeorge Wilson blkptr_t *bp = zio->io_bp; 260280901aeaSGeorge Wilson blkptr_t *bp_orig = &zio->io_bp_orig; 260380901aeaSGeorge Wilson zio_prop_t *zp = &zio->io_prop; 260480901aeaSGeorge Wilson 260580901aeaSGeorge Wilson ASSERT(BP_GET_LEVEL(bp) == 0); 260680901aeaSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 260780901aeaSGeorge Wilson ASSERT(zp->zp_nopwrite); 260880901aeaSGeorge Wilson ASSERT(!zp->zp_dedup); 260980901aeaSGeorge Wilson ASSERT(zio->io_bp_override == NULL); 261080901aeaSGeorge Wilson ASSERT(IO_IS_ALLOCATING(zio)); 261180901aeaSGeorge Wilson 261280901aeaSGeorge Wilson /* 261380901aeaSGeorge Wilson * Check to see if the original bp and the new bp have matching 261480901aeaSGeorge Wilson * characteristics (i.e. same checksum, compression algorithms, etc). 261580901aeaSGeorge Wilson * If they don't then just continue with the pipeline which will 261680901aeaSGeorge Wilson * allocate a new bp. 261780901aeaSGeorge Wilson */ 261880901aeaSGeorge Wilson if (BP_IS_HOLE(bp_orig) || 261945818ee1SMatthew Ahrens !(zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_flags & 262045818ee1SMatthew Ahrens ZCHECKSUM_FLAG_NOPWRITE) || 2621eb633035STom Caputi BP_IS_ENCRYPTED(bp) || BP_IS_ENCRYPTED(bp_orig) || 262280901aeaSGeorge Wilson BP_GET_CHECKSUM(bp) != BP_GET_CHECKSUM(bp_orig) || 262380901aeaSGeorge Wilson BP_GET_COMPRESS(bp) != BP_GET_COMPRESS(bp_orig) || 262480901aeaSGeorge Wilson BP_GET_DEDUP(bp) != BP_GET_DEDUP(bp_orig) || 262580901aeaSGeorge Wilson zp->zp_copies != BP_GET_NDVAS(bp_orig)) 262680901aeaSGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 262780901aeaSGeorge Wilson 262880901aeaSGeorge Wilson /* 262980901aeaSGeorge Wilson * If the checksums match then reset the pipeline so that we 263080901aeaSGeorge Wilson * avoid allocating a new bp and issuing any I/O. 263180901aeaSGeorge Wilson */ 263280901aeaSGeorge Wilson if (ZIO_CHECKSUM_EQUAL(bp->blk_cksum, bp_orig->blk_cksum)) { 263345818ee1SMatthew Ahrens ASSERT(zio_checksum_table[zp->zp_checksum].ci_flags & 263445818ee1SMatthew Ahrens ZCHECKSUM_FLAG_NOPWRITE); 263580901aeaSGeorge Wilson ASSERT3U(BP_GET_PSIZE(bp), ==, BP_GET_PSIZE(bp_orig)); 263680901aeaSGeorge Wilson ASSERT3U(BP_GET_LSIZE(bp), ==, BP_GET_LSIZE(bp_orig)); 263780901aeaSGeorge Wilson ASSERT(zp->zp_compress != ZIO_COMPRESS_OFF); 263880901aeaSGeorge Wilson ASSERT(bcmp(&bp->blk_prop, &bp_orig->blk_prop, 263980901aeaSGeorge Wilson sizeof (uint64_t)) == 0); 264080901aeaSGeorge Wilson 264180901aeaSGeorge Wilson *bp = *bp_orig; 264280901aeaSGeorge Wilson zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 264380901aeaSGeorge Wilson zio->io_flags |= ZIO_FLAG_NOPWRITE; 264480901aeaSGeorge Wilson } 264580901aeaSGeorge Wilson 264680901aeaSGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 264780901aeaSGeorge Wilson } 264880901aeaSGeorge Wilson 2649fa9e4066Sahrens /* 2650fa9e4066Sahrens * ========================================================================== 2651b24ab676SJeff Bonwick * Dedup 2652fa9e4066Sahrens * ========================================================================== 2653fa9e4066Sahrens */ 2654b24ab676SJeff Bonwick static void 2655b24ab676SJeff Bonwick zio_ddt_child_read_done(zio_t *zio) 2656b24ab676SJeff Bonwick { 2657b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2658b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2659b24ab676SJeff Bonwick ddt_phys_t *ddp; 2660b24ab676SJeff Bonwick zio_t *pio = zio_unique_parent(zio); 2661b24ab676SJeff Bonwick 2662b24ab676SJeff Bonwick mutex_enter(&pio->io_lock); 2663b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 2664b24ab676SJeff Bonwick if (zio->io_error == 0) 2665b24ab676SJeff Bonwick ddt_phys_clear(ddp); /* this ddp doesn't need repair */ 2666770499e1SDan Kimmel 2667770499e1SDan Kimmel if (zio->io_error == 0 && dde->dde_repair_abd == NULL) 2668770499e1SDan Kimmel dde->dde_repair_abd = zio->io_abd; 2669b24ab676SJeff Bonwick else 2670770499e1SDan Kimmel abd_free(zio->io_abd); 2671b24ab676SJeff Bonwick mutex_exit(&pio->io_lock); 2672b24ab676SJeff Bonwick } 2673b24ab676SJeff Bonwick 2674b24ab676SJeff Bonwick static int 2675b24ab676SJeff Bonwick zio_ddt_read_start(zio_t *zio) 2676b24ab676SJeff Bonwick { 2677b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2678b24ab676SJeff Bonwick 2679b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2680b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 2681b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2682b24ab676SJeff Bonwick 2683b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 2684b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 2685b24ab676SJeff Bonwick ddt_entry_t *dde = ddt_repair_start(ddt, bp); 2686b24ab676SJeff Bonwick ddt_phys_t *ddp = dde->dde_phys; 2687b24ab676SJeff Bonwick ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); 2688b24ab676SJeff Bonwick blkptr_t blk; 2689b24ab676SJeff Bonwick 2690b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 2691b24ab676SJeff Bonwick zio->io_vsd = dde; 2692b24ab676SJeff Bonwick 2693b24ab676SJeff Bonwick if (ddp_self == NULL) 2694b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2695b24ab676SJeff Bonwick 2696b24ab676SJeff Bonwick for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { 2697b24ab676SJeff Bonwick if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) 2698b24ab676SJeff Bonwick continue; 2699bbfd46c4SJeff Bonwick ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, 2700bbfd46c4SJeff Bonwick &blk); 2701b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, &blk, 2702770499e1SDan Kimmel abd_alloc_for_io(zio->io_size, B_TRUE), 2703770499e1SDan Kimmel zio->io_size, zio_ddt_child_read_done, dde, 2704770499e1SDan Kimmel zio->io_priority, ZIO_DDT_CHILD_FLAGS(zio) | 2705770499e1SDan Kimmel ZIO_FLAG_DONT_PROPAGATE, &zio->io_bookmark)); 2706b24ab676SJeff Bonwick } 2707b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2708b24ab676SJeff Bonwick } 2709b24ab676SJeff Bonwick 2710b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, bp, 2711770499e1SDan Kimmel zio->io_abd, zio->io_size, NULL, NULL, zio->io_priority, 2712b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); 2713b24ab676SJeff Bonwick 2714b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2715b24ab676SJeff Bonwick } 2716e14bb325SJeff Bonwick 2717b24ab676SJeff Bonwick static int 2718b24ab676SJeff Bonwick zio_ddt_read_done(zio_t *zio) 2719b24ab676SJeff Bonwick { 2720b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2721b24ab676SJeff Bonwick 2722d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_DDT_BIT, ZIO_WAIT_DONE)) { 2723b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 2724d6e1c446SGeorge Wilson } 2725b24ab676SJeff Bonwick 2726b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2727b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 2728b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2729b24ab676SJeff Bonwick 2730b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 2731b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 2732b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_vsd; 2733b24ab676SJeff Bonwick if (ddt == NULL) { 2734b16da2e2SGeorge Wilson ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE); 2735b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2736b24ab676SJeff Bonwick } 2737b24ab676SJeff Bonwick if (dde == NULL) { 2738b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; 273935a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 2740b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 2741b24ab676SJeff Bonwick } 2742770499e1SDan Kimmel if (dde->dde_repair_abd != NULL) { 2743770499e1SDan Kimmel abd_copy(zio->io_abd, dde->dde_repair_abd, 2744770499e1SDan Kimmel zio->io_size); 2745b24ab676SJeff Bonwick zio->io_child_error[ZIO_CHILD_DDT] = 0; 2746b24ab676SJeff Bonwick } 2747b24ab676SJeff Bonwick ddt_repair_done(ddt, dde); 2748b24ab676SJeff Bonwick zio->io_vsd = NULL; 2749b24ab676SJeff Bonwick } 2750b24ab676SJeff Bonwick 2751b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 2752b24ab676SJeff Bonwick 2753b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2754b24ab676SJeff Bonwick } 2755b24ab676SJeff Bonwick 2756b24ab676SJeff Bonwick static boolean_t 2757b24ab676SJeff Bonwick zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) 2758b24ab676SJeff Bonwick { 2759b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2760eb633035STom Caputi boolean_t do_raw = !!(zio->io_flags & ZIO_FLAG_RAW); 27615602294fSDan Kimmel 27625602294fSDan Kimmel /* We should never get a raw, override zio */ 27635602294fSDan Kimmel ASSERT(!(zio->io_bp_override && do_raw)); 2764b24ab676SJeff Bonwick 2765b24ab676SJeff Bonwick /* 2766b24ab676SJeff Bonwick * Note: we compare the original data, not the transformed data, 2767b24ab676SJeff Bonwick * because when zio->io_bp is an override bp, we will not have 2768b24ab676SJeff Bonwick * pushed the I/O transforms. That's an important optimization 2769b24ab676SJeff Bonwick * because otherwise we'd compress/encrypt all dmu_sync() data twice. 2770eb633035STom Caputi * However, we should never get a raw, override zio so in these 2771eb633035STom Caputi * cases we can compare the io_data directly. This is useful because 2772eb633035STom Caputi * it allows us to do dedup verification even if we don't have access 2773eb633035STom Caputi * to the original data (for instance, if the encryption keys aren't 2774eb633035STom Caputi * loaded). 2775b24ab676SJeff Bonwick */ 2776eb633035STom Caputi 2777b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 2778b24ab676SJeff Bonwick zio_t *lio = dde->dde_lead_zio[p]; 2779b24ab676SJeff Bonwick 2780eb633035STom Caputi if (lio != NULL && do_raw) { 2781eb633035STom Caputi return (lio->io_size != zio->io_size || 2782eb633035STom Caputi abd_cmp(zio->io_abd, lio->io_abd, 2783eb633035STom Caputi zio->io_size) != 0); 2784eb633035STom Caputi } else if (lio != NULL) { 2785b24ab676SJeff Bonwick return (lio->io_orig_size != zio->io_orig_size || 2786770499e1SDan Kimmel abd_cmp(zio->io_orig_abd, lio->io_orig_abd, 2787b24ab676SJeff Bonwick zio->io_orig_size) != 0); 2788b24ab676SJeff Bonwick } 2789b24ab676SJeff Bonwick } 2790b24ab676SJeff Bonwick 2791b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 2792b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2793b24ab676SJeff Bonwick 2794eb633035STom Caputi if (ddp->ddp_phys_birth != 0 && do_raw) { 2795eb633035STom Caputi blkptr_t blk = *zio->io_bp; 2796eb633035STom Caputi uint64_t psize; 2797eb633035STom Caputi abd_t *tmpabd; 2798eb633035STom Caputi int error; 2799eb633035STom Caputi 2800eb633035STom Caputi ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); 2801eb633035STom Caputi psize = BP_GET_PSIZE(&blk); 2802eb633035STom Caputi 2803eb633035STom Caputi if (psize != zio->io_size) 2804eb633035STom Caputi return (B_TRUE); 2805eb633035STom Caputi 2806eb633035STom Caputi ddt_exit(ddt); 2807eb633035STom Caputi 2808eb633035STom Caputi tmpabd = abd_alloc_for_io(psize, B_TRUE); 2809eb633035STom Caputi 2810eb633035STom Caputi error = zio_wait(zio_read(NULL, spa, &blk, tmpabd, 2811eb633035STom Caputi psize, NULL, NULL, ZIO_PRIORITY_SYNC_READ, 2812eb633035STom Caputi ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 2813eb633035STom Caputi ZIO_FLAG_RAW, &zio->io_bookmark)); 2814eb633035STom Caputi 2815eb633035STom Caputi if (error == 0) { 2816eb633035STom Caputi if (abd_cmp(tmpabd, zio->io_abd, psize) != 0) 2817eb633035STom Caputi error = SET_ERROR(ENOENT); 2818eb633035STom Caputi } 2819eb633035STom Caputi 2820eb633035STom Caputi abd_free(tmpabd); 2821eb633035STom Caputi ddt_enter(ddt); 2822eb633035STom Caputi return (error != 0); 2823eb633035STom Caputi } else if (ddp->ddp_phys_birth != 0) { 2824b24ab676SJeff Bonwick arc_buf_t *abuf = NULL; 28257adb730bSGeorge Wilson arc_flags_t aflags = ARC_FLAG_WAIT; 28265602294fSDan Kimmel int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE; 2827b24ab676SJeff Bonwick blkptr_t blk = *zio->io_bp; 2828b24ab676SJeff Bonwick int error; 2829b24ab676SJeff Bonwick 2830b24ab676SJeff Bonwick ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); 2831b24ab676SJeff Bonwick 2832eb633035STom Caputi if (BP_GET_LSIZE(&blk) != zio->io_orig_size) 2833eb633035STom Caputi return (B_TRUE); 2834eb633035STom Caputi 2835b24ab676SJeff Bonwick ddt_exit(ddt); 2836b24ab676SJeff Bonwick 28375602294fSDan Kimmel /* 28385602294fSDan Kimmel * Intuitively, it would make more sense to compare 2839770499e1SDan Kimmel * io_abd than io_orig_abd in the raw case since you 28405602294fSDan Kimmel * don't want to look at any transformations that have 28415602294fSDan Kimmel * happened to the data. However, for raw I/Os the 2842770499e1SDan Kimmel * data will actually be the same in io_abd and 2843770499e1SDan Kimmel * io_orig_abd, so all we have to do is issue this as 28445602294fSDan Kimmel * a raw ARC read. 28455602294fSDan Kimmel */ 28465602294fSDan Kimmel if (do_raw) { 28475602294fSDan Kimmel zio_flags |= ZIO_FLAG_RAW; 28485602294fSDan Kimmel ASSERT3U(zio->io_size, ==, zio->io_orig_size); 2849770499e1SDan Kimmel ASSERT0(abd_cmp(zio->io_abd, zio->io_orig_abd, 28505602294fSDan Kimmel zio->io_size)); 28515602294fSDan Kimmel ASSERT3P(zio->io_transform_stack, ==, NULL); 28525602294fSDan Kimmel } 28535602294fSDan Kimmel 28541b912ec7SGeorge Wilson error = arc_read(NULL, spa, &blk, 2855b24ab676SJeff Bonwick arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, 28565602294fSDan Kimmel zio_flags, &aflags, &zio->io_bookmark); 2857b24ab676SJeff Bonwick 2858b24ab676SJeff Bonwick if (error == 0) { 2859eb633035STom Caputi if (abd_cmp_buf(zio->io_orig_abd, abuf->b_data, 2860b24ab676SJeff Bonwick zio->io_orig_size) != 0) 2861eb633035STom Caputi error = SET_ERROR(ENOENT); 2862dcbf3bd6SGeorge Wilson arc_buf_destroy(abuf, &abuf); 2863b24ab676SJeff Bonwick } 2864b24ab676SJeff Bonwick 2865b24ab676SJeff Bonwick ddt_enter(ddt); 2866b24ab676SJeff Bonwick return (error != 0); 2867b24ab676SJeff Bonwick } 2868b24ab676SJeff Bonwick } 2869b24ab676SJeff Bonwick 2870b24ab676SJeff Bonwick return (B_FALSE); 2871b24ab676SJeff Bonwick } 2872b24ab676SJeff Bonwick 2873b24ab676SJeff Bonwick static void 2874b24ab676SJeff Bonwick zio_ddt_child_write_ready(zio_t *zio) 2875b24ab676SJeff Bonwick { 2876b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 2877b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 2878b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2879b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2880b24ab676SJeff Bonwick zio_t *pio; 2881b24ab676SJeff Bonwick 2882b24ab676SJeff Bonwick if (zio->io_error) 2883b24ab676SJeff Bonwick return; 2884b24ab676SJeff Bonwick 2885b24ab676SJeff Bonwick ddt_enter(ddt); 2886b24ab676SJeff Bonwick 2887b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2888b24ab676SJeff Bonwick 2889b24ab676SJeff Bonwick ddt_phys_fill(ddp, zio->io_bp); 2890b24ab676SJeff Bonwick 28910f7643c7SGeorge Wilson zio_link_t *zl = NULL; 28920f7643c7SGeorge Wilson while ((pio = zio_walk_parents(zio, &zl)) != NULL) 2893b24ab676SJeff Bonwick ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); 2894b24ab676SJeff Bonwick 2895b24ab676SJeff Bonwick ddt_exit(ddt); 2896b24ab676SJeff Bonwick } 2897b24ab676SJeff Bonwick 2898b24ab676SJeff Bonwick static void 2899b24ab676SJeff Bonwick zio_ddt_child_write_done(zio_t *zio) 2900b24ab676SJeff Bonwick { 2901b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 2902b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 2903b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2904b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2905b24ab676SJeff Bonwick 2906b24ab676SJeff Bonwick ddt_enter(ddt); 2907b24ab676SJeff Bonwick 2908b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 2909b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2910b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 2911b24ab676SJeff Bonwick 2912b24ab676SJeff Bonwick if (zio->io_error == 0) { 29130f7643c7SGeorge Wilson zio_link_t *zl = NULL; 29140f7643c7SGeorge Wilson while (zio_walk_parents(zio, &zl) != NULL) 2915b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2916b24ab676SJeff Bonwick } else { 2917b24ab676SJeff Bonwick ddt_phys_clear(ddp); 2918b24ab676SJeff Bonwick } 2919b24ab676SJeff Bonwick 2920b24ab676SJeff Bonwick ddt_exit(ddt); 2921b24ab676SJeff Bonwick } 2922b24ab676SJeff Bonwick 2923b24ab676SJeff Bonwick static void 2924b24ab676SJeff Bonwick zio_ddt_ditto_write_done(zio_t *zio) 2925b24ab676SJeff Bonwick { 2926b24ab676SJeff Bonwick int p = DDT_PHYS_DITTO; 2927b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 2928b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2929b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 2930b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2931b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2932b24ab676SJeff Bonwick ddt_key_t *ddk = &dde->dde_key; 2933b24ab676SJeff Bonwick 2934b24ab676SJeff Bonwick ddt_enter(ddt); 2935b24ab676SJeff Bonwick 2936b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 2937b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2938b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 2939b24ab676SJeff Bonwick 2940b24ab676SJeff Bonwick if (zio->io_error == 0) { 2941b24ab676SJeff Bonwick ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); 2942b24ab676SJeff Bonwick ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); 2943b24ab676SJeff Bonwick ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); 2944b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2945b24ab676SJeff Bonwick ddt_phys_free(ddt, ddk, ddp, zio->io_txg); 2946b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2947b24ab676SJeff Bonwick } 2948b24ab676SJeff Bonwick 2949b24ab676SJeff Bonwick ddt_exit(ddt); 2950b24ab676SJeff Bonwick } 2951b24ab676SJeff Bonwick 2952b24ab676SJeff Bonwick static int 2953b24ab676SJeff Bonwick zio_ddt_write(zio_t *zio) 2954b24ab676SJeff Bonwick { 2955b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2956b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2957b24ab676SJeff Bonwick uint64_t txg = zio->io_txg; 2958b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 2959b24ab676SJeff Bonwick int p = zp->zp_copies; 2960b24ab676SJeff Bonwick int ditto_copies; 2961b24ab676SJeff Bonwick zio_t *cio = NULL; 2962b24ab676SJeff Bonwick zio_t *dio = NULL; 2963b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2964b24ab676SJeff Bonwick ddt_entry_t *dde; 2965b24ab676SJeff Bonwick ddt_phys_t *ddp; 2966b24ab676SJeff Bonwick 2967b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2968b24ab676SJeff Bonwick ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); 2969b24ab676SJeff Bonwick ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); 29705602294fSDan Kimmel ASSERT(!(zio->io_bp_override && (zio->io_flags & ZIO_FLAG_RAW))); 2971b24ab676SJeff Bonwick 2972b24ab676SJeff Bonwick ddt_enter(ddt); 2973b24ab676SJeff Bonwick dde = ddt_lookup(ddt, bp, B_TRUE); 2974b24ab676SJeff Bonwick ddp = &dde->dde_phys[p]; 2975b24ab676SJeff Bonwick 2976b24ab676SJeff Bonwick if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { 2977b24ab676SJeff Bonwick /* 2978b24ab676SJeff Bonwick * If we're using a weak checksum, upgrade to a strong checksum 2979b24ab676SJeff Bonwick * and try again. If we're already using a strong checksum, 2980b24ab676SJeff Bonwick * we can't resolve it, so just convert to an ordinary write. 2981b24ab676SJeff Bonwick * (And automatically e-mail a paper to Nature?) 2982b24ab676SJeff Bonwick */ 298345818ee1SMatthew Ahrens if (!(zio_checksum_table[zp->zp_checksum].ci_flags & 298445818ee1SMatthew Ahrens ZCHECKSUM_FLAG_DEDUP)) { 2985b24ab676SJeff Bonwick zp->zp_checksum = spa_dedup_checksum(spa); 2986b24ab676SJeff Bonwick zio_pop_transforms(zio); 2987b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2988b24ab676SJeff Bonwick BP_ZERO(bp); 2989b24ab676SJeff Bonwick } else { 299080901aeaSGeorge Wilson zp->zp_dedup = B_FALSE; 29915602294fSDan Kimmel BP_SET_DEDUP(bp, B_FALSE); 2992b24ab676SJeff Bonwick } 29935602294fSDan Kimmel ASSERT(!BP_GET_DEDUP(bp)); 2994b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2995b24ab676SJeff Bonwick ddt_exit(ddt); 2996b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2997b24ab676SJeff Bonwick } 2998b24ab676SJeff Bonwick 2999b24ab676SJeff Bonwick ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); 3000b24ab676SJeff Bonwick ASSERT(ditto_copies < SPA_DVAS_PER_BP); 3001b24ab676SJeff Bonwick 3002b24ab676SJeff Bonwick if (ditto_copies > ddt_ditto_copies_present(dde) && 3003b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { 3004b24ab676SJeff Bonwick zio_prop_t czp = *zp; 3005b24ab676SJeff Bonwick 3006b24ab676SJeff Bonwick czp.zp_copies = ditto_copies; 3007b24ab676SJeff Bonwick 3008b24ab676SJeff Bonwick /* 3009b24ab676SJeff Bonwick * If we arrived here with an override bp, we won't have run 3010b24ab676SJeff Bonwick * the transform stack, so we won't have the data we need to 3011b24ab676SJeff Bonwick * generate a child i/o. So, toss the override bp and restart. 3012b24ab676SJeff Bonwick * This is safe, because using the override bp is just an 3013b24ab676SJeff Bonwick * optimization; and it's rare, so the cost doesn't matter. 3014b24ab676SJeff Bonwick */ 3015b24ab676SJeff Bonwick if (zio->io_bp_override) { 3016b24ab676SJeff Bonwick zio_pop_transforms(zio); 3017b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 3018b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 3019b24ab676SJeff Bonwick zio->io_bp_override = NULL; 3020b24ab676SJeff Bonwick BP_ZERO(bp); 3021b24ab676SJeff Bonwick ddt_exit(ddt); 3022b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 3023b24ab676SJeff Bonwick } 3024b24ab676SJeff Bonwick 3025770499e1SDan Kimmel dio = zio_write(zio, spa, txg, bp, zio->io_orig_abd, 30265602294fSDan Kimmel zio->io_orig_size, zio->io_orig_size, &czp, NULL, NULL, 30278df0bcf0SPaul Dagnelie NULL, zio_ddt_ditto_write_done, dde, zio->io_priority, 3028b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 3029b24ab676SJeff Bonwick 3030770499e1SDan Kimmel zio_push_transform(dio, zio->io_abd, zio->io_size, 0, NULL); 3031b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; 3032b24ab676SJeff Bonwick } 3033b24ab676SJeff Bonwick 3034b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { 3035b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 3036b24ab676SJeff Bonwick ddt_bp_fill(ddp, bp, txg); 3037b24ab676SJeff Bonwick if (dde->dde_lead_zio[p] != NULL) 3038b24ab676SJeff Bonwick zio_add_child(zio, dde->dde_lead_zio[p]); 3039b24ab676SJeff Bonwick else 3040b24ab676SJeff Bonwick ddt_phys_addref(ddp); 3041b24ab676SJeff Bonwick } else if (zio->io_bp_override) { 3042b24ab676SJeff Bonwick ASSERT(bp->blk_birth == txg); 3043b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, zio->io_bp_override)); 3044b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 3045b24ab676SJeff Bonwick ddt_phys_addref(ddp); 3046b24ab676SJeff Bonwick } else { 3047770499e1SDan Kimmel cio = zio_write(zio, spa, txg, bp, zio->io_orig_abd, 30485602294fSDan Kimmel zio->io_orig_size, zio->io_orig_size, zp, 30498df0bcf0SPaul Dagnelie zio_ddt_child_write_ready, NULL, NULL, 3050b24ab676SJeff Bonwick zio_ddt_child_write_done, dde, zio->io_priority, 3051b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 3052b24ab676SJeff Bonwick 3053770499e1SDan Kimmel zio_push_transform(cio, zio->io_abd, zio->io_size, 0, NULL); 3054b24ab676SJeff Bonwick dde->dde_lead_zio[p] = cio; 3055b24ab676SJeff Bonwick } 3056b24ab676SJeff Bonwick 3057b24ab676SJeff Bonwick ddt_exit(ddt); 3058b24ab676SJeff Bonwick 3059b24ab676SJeff Bonwick if (cio) 3060b24ab676SJeff Bonwick zio_nowait(cio); 3061b24ab676SJeff Bonwick if (dio) 3062b24ab676SJeff Bonwick zio_nowait(dio); 3063b24ab676SJeff Bonwick 3064b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 3065b24ab676SJeff Bonwick } 3066b24ab676SJeff Bonwick 30673f9d6ad7SLin Ling ddt_entry_t *freedde; /* for debugging */ 30683f9d6ad7SLin Ling 3069b24ab676SJeff Bonwick static int 3070b24ab676SJeff Bonwick zio_ddt_free(zio_t *zio) 3071b24ab676SJeff Bonwick { 3072b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 3073b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 3074b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 3075b24ab676SJeff Bonwick ddt_entry_t *dde; 3076b24ab676SJeff Bonwick ddt_phys_t *ddp; 3077b24ab676SJeff Bonwick 3078b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 3079b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 3080b24ab676SJeff Bonwick 3081b24ab676SJeff Bonwick ddt_enter(ddt); 30823f9d6ad7SLin Ling freedde = dde = ddt_lookup(ddt, bp, B_TRUE); 3083b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 3084b24ab676SJeff Bonwick ddt_phys_decref(ddp); 3085b24ab676SJeff Bonwick ddt_exit(ddt); 3086b24ab676SJeff Bonwick 3087b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 3088b24ab676SJeff Bonwick } 3089b24ab676SJeff Bonwick 3090b24ab676SJeff Bonwick /* 3091b24ab676SJeff Bonwick * ========================================================================== 3092b24ab676SJeff Bonwick * Allocate and free blocks 3093b24ab676SJeff Bonwick * ========================================================================== 3094b24ab676SJeff Bonwick */ 30950f7643c7SGeorge Wilson 30960f7643c7SGeorge Wilson static zio_t * 3097f78cdc34SPaul Dagnelie zio_io_to_allocate(spa_t *spa, int allocator) 30980f7643c7SGeorge Wilson { 30990f7643c7SGeorge Wilson zio_t *zio; 31000f7643c7SGeorge Wilson 3101f78cdc34SPaul Dagnelie ASSERT(MUTEX_HELD(&spa->spa_alloc_locks[allocator])); 31020f7643c7SGeorge Wilson 3103f78cdc34SPaul Dagnelie zio = avl_first(&spa->spa_alloc_trees[allocator]); 31040f7643c7SGeorge Wilson if (zio == NULL) 31050f7643c7SGeorge Wilson return (NULL); 31060f7643c7SGeorge Wilson 31070f7643c7SGeorge Wilson ASSERT(IO_IS_ALLOCATING(zio)); 31080f7643c7SGeorge Wilson 31090f7643c7SGeorge Wilson /* 31100f7643c7SGeorge Wilson * Try to place a reservation for this zio. If we're unable to 31110f7643c7SGeorge Wilson * reserve then we throttle. 31120f7643c7SGeorge Wilson */ 3113f78cdc34SPaul Dagnelie ASSERT3U(zio->io_allocator, ==, allocator); 3114663207adSDon Brady if (!metaslab_class_throttle_reserve(zio->io_metaslab_class, 3115f78cdc34SPaul Dagnelie zio->io_prop.zp_copies, zio->io_allocator, zio, 0)) { 31160f7643c7SGeorge Wilson return (NULL); 31170f7643c7SGeorge Wilson } 31180f7643c7SGeorge Wilson 3119f78cdc34SPaul Dagnelie avl_remove(&spa->spa_alloc_trees[allocator], zio); 31200f7643c7SGeorge Wilson ASSERT3U(zio->io_stage, <, ZIO_STAGE_DVA_ALLOCATE); 31210f7643c7SGeorge Wilson 31220f7643c7SGeorge Wilson return (zio); 31230f7643c7SGeorge Wilson } 31240f7643c7SGeorge Wilson 31250f7643c7SGeorge Wilson static int 31260f7643c7SGeorge Wilson zio_dva_throttle(zio_t *zio) 31270f7643c7SGeorge Wilson { 31280f7643c7SGeorge Wilson spa_t *spa = zio->io_spa; 31290f7643c7SGeorge Wilson zio_t *nio; 3130663207adSDon Brady metaslab_class_t *mc; 3131663207adSDon Brady 3132663207adSDon Brady /* locate an appropriate allocation class */ 3133663207adSDon Brady mc = spa_preferred_class(spa, zio->io_size, zio->io_prop.zp_type, 3134663207adSDon Brady zio->io_prop.zp_level, zio->io_prop.zp_zpl_smallblk); 31350f7643c7SGeorge Wilson 31360f7643c7SGeorge Wilson if (zio->io_priority == ZIO_PRIORITY_SYNC_WRITE || 3137663207adSDon Brady !mc->mc_alloc_throttle_enabled || 31380f7643c7SGeorge Wilson zio->io_child_type == ZIO_CHILD_GANG || 31390f7643c7SGeorge Wilson zio->io_flags & ZIO_FLAG_NODATA) { 31400f7643c7SGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 31410f7643c7SGeorge Wilson } 31420f7643c7SGeorge Wilson 31430f7643c7SGeorge Wilson ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 31440f7643c7SGeorge Wilson 31450f7643c7SGeorge Wilson ASSERT3U(zio->io_queued_timestamp, >, 0); 31460f7643c7SGeorge Wilson ASSERT(zio->io_stage == ZIO_STAGE_DVA_THROTTLE); 31470f7643c7SGeorge Wilson 3148f78cdc34SPaul Dagnelie zbookmark_phys_t *bm = &zio->io_bookmark; 3149f78cdc34SPaul Dagnelie /* 3150f78cdc34SPaul Dagnelie * We want to try to use as many allocators as possible to help improve 3151f78cdc34SPaul Dagnelie * performance, but we also want logically adjacent IOs to be physically 3152f78cdc34SPaul Dagnelie * adjacent to improve sequential read performance. We chunk each object 3153f78cdc34SPaul Dagnelie * into 2^20 block regions, and then hash based on the objset, object, 3154f78cdc34SPaul Dagnelie * level, and region to accomplish both of these goals. 3155f78cdc34SPaul Dagnelie */ 3156f78cdc34SPaul Dagnelie zio->io_allocator = cityhash4(bm->zb_objset, bm->zb_object, 3157f78cdc34SPaul Dagnelie bm->zb_level, bm->zb_blkid >> 20) % spa->spa_alloc_count; 3158f78cdc34SPaul Dagnelie mutex_enter(&spa->spa_alloc_locks[zio->io_allocator]); 31590f7643c7SGeorge Wilson ASSERT(zio->io_type == ZIO_TYPE_WRITE); 3160663207adSDon Brady zio->io_metaslab_class = mc; 3161f78cdc34SPaul Dagnelie avl_add(&spa->spa_alloc_trees[zio->io_allocator], zio); 3162663207adSDon Brady nio = zio_io_to_allocate(spa, zio->io_allocator); 3163f78cdc34SPaul Dagnelie mutex_exit(&spa->spa_alloc_locks[zio->io_allocator]); 31640f7643c7SGeorge Wilson 31650f7643c7SGeorge Wilson if (nio == zio) 31660f7643c7SGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 31670f7643c7SGeorge Wilson 31680f7643c7SGeorge Wilson if (nio != NULL) { 31690f7643c7SGeorge Wilson ASSERT(nio->io_stage == ZIO_STAGE_DVA_THROTTLE); 31700f7643c7SGeorge Wilson /* 31710f7643c7SGeorge Wilson * We are passing control to a new zio so make sure that 31720f7643c7SGeorge Wilson * it is processed by a different thread. We do this to 31730f7643c7SGeorge Wilson * avoid stack overflows that can occur when parents are 31740f7643c7SGeorge Wilson * throttled and children are making progress. We allow 31750f7643c7SGeorge Wilson * it to go to the head of the taskq since it's already 31760f7643c7SGeorge Wilson * been waiting. 31770f7643c7SGeorge Wilson */ 31780f7643c7SGeorge Wilson zio_taskq_dispatch(nio, ZIO_TASKQ_ISSUE, B_TRUE); 31790f7643c7SGeorge Wilson } 31800f7643c7SGeorge Wilson return (ZIO_PIPELINE_STOP); 31810f7643c7SGeorge Wilson } 31820f7643c7SGeorge Wilson 3183663207adSDon Brady static void 3184f78cdc34SPaul Dagnelie zio_allocate_dispatch(spa_t *spa, int allocator) 31850f7643c7SGeorge Wilson { 31860f7643c7SGeorge Wilson zio_t *zio; 31870f7643c7SGeorge Wilson 3188f78cdc34SPaul Dagnelie mutex_enter(&spa->spa_alloc_locks[allocator]); 3189f78cdc34SPaul Dagnelie zio = zio_io_to_allocate(spa, allocator); 3190f78cdc34SPaul Dagnelie mutex_exit(&spa->spa_alloc_locks[allocator]); 31910f7643c7SGeorge Wilson if (zio == NULL) 31920f7643c7SGeorge Wilson return; 31930f7643c7SGeorge Wilson 31940f7643c7SGeorge Wilson ASSERT3U(zio->io_stage, ==, ZIO_STAGE_DVA_THROTTLE); 31950f7643c7SGeorge Wilson ASSERT0(zio->io_error); 31960f7643c7SGeorge Wilson zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_TRUE); 31970f7643c7SGeorge Wilson } 31980f7643c7SGeorge Wilson 3199e05725b1Sbonwick static int 3200fa9e4066Sahrens zio_dva_allocate(zio_t *zio) 3201fa9e4066Sahrens { 32028654d025Sperrin spa_t *spa = zio->io_spa; 3203663207adSDon Brady metaslab_class_t *mc; 3204fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 3205fa9e4066Sahrens int error; 320609c9d376SGeorge Wilson int flags = 0; 3207fa9e4066Sahrens 3208f5383399SBill Moore if (zio->io_gang_leader == NULL) { 3209f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 3210f5383399SBill Moore zio->io_gang_leader = zio; 3211f5383399SBill Moore } 3212f5383399SBill Moore 3213fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 3214fb09f5aaSMadhav Suresh ASSERT0(BP_GET_NDVAS(bp)); 3215b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, >, 0); 3216b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); 3217fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 3218fa9e4066Sahrens 3219663207adSDon Brady if (zio->io_flags & ZIO_FLAG_NODATA) 32200f7643c7SGeorge Wilson flags |= METASLAB_DONT_THROTTLE; 3221663207adSDon Brady if (zio->io_flags & ZIO_FLAG_GANG_CHILD) 32220f7643c7SGeorge Wilson flags |= METASLAB_GANG_CHILD; 3223663207adSDon Brady if (zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE) 32240f7643c7SGeorge Wilson flags |= METASLAB_ASYNC_ALLOC; 3225663207adSDon Brady 3226663207adSDon Brady /* 3227663207adSDon Brady * if not already chosen, locate an appropriate allocation class 3228663207adSDon Brady */ 3229663207adSDon Brady mc = zio->io_metaslab_class; 3230663207adSDon Brady if (mc == NULL) { 3231663207adSDon Brady mc = spa_preferred_class(spa, zio->io_size, 3232663207adSDon Brady zio->io_prop.zp_type, zio->io_prop.zp_level, 3233663207adSDon Brady zio->io_prop.zp_zpl_smallblk); 3234663207adSDon Brady zio->io_metaslab_class = mc; 32350f7643c7SGeorge Wilson } 32360f7643c7SGeorge Wilson 3237e14bb325SJeff Bonwick error = metaslab_alloc(spa, mc, zio->io_size, bp, 32388363e80aSGeorge Wilson zio->io_prop.zp_copies, zio->io_txg, NULL, flags, 3239f78cdc34SPaul Dagnelie &zio->io_alloc_list, zio, zio->io_allocator); 3240fa9e4066Sahrens 3241663207adSDon Brady /* 3242663207adSDon Brady * Fallback to normal class when an alloc class is full 3243663207adSDon Brady */ 3244663207adSDon Brady if (error == ENOSPC && mc != spa_normal_class(spa)) { 3245663207adSDon Brady /* 3246663207adSDon Brady * If throttling, transfer reservation over to normal class. 3247663207adSDon Brady * The io_allocator slot can remain the same even though we 3248663207adSDon Brady * are switching classes. 3249663207adSDon Brady */ 3250663207adSDon Brady if (mc->mc_alloc_throttle_enabled && 3251663207adSDon Brady (zio->io_flags & ZIO_FLAG_IO_ALLOCATING)) { 3252663207adSDon Brady metaslab_class_throttle_unreserve(mc, 3253663207adSDon Brady zio->io_prop.zp_copies, zio->io_allocator, zio); 3254663207adSDon Brady zio->io_flags &= ~ZIO_FLAG_IO_ALLOCATING; 3255663207adSDon Brady 3256663207adSDon Brady mc = spa_normal_class(spa); 3257663207adSDon Brady VERIFY(metaslab_class_throttle_reserve(mc, 3258663207adSDon Brady zio->io_prop.zp_copies, zio->io_allocator, zio, 3259663207adSDon Brady flags | METASLAB_MUST_RESERVE)); 3260663207adSDon Brady } else { 3261663207adSDon Brady mc = spa_normal_class(spa); 3262663207adSDon Brady } 3263663207adSDon Brady zio->io_metaslab_class = mc; 3264663207adSDon Brady 3265663207adSDon Brady error = metaslab_alloc(spa, mc, zio->io_size, bp, 3266663207adSDon Brady zio->io_prop.zp_copies, zio->io_txg, NULL, flags, 3267663207adSDon Brady &zio->io_alloc_list, zio, zio->io_allocator); 3268663207adSDon Brady } 3269663207adSDon Brady 32700f7643c7SGeorge Wilson if (error != 0) { 327121f7c81cSMatthew Ahrens zfs_dbgmsg("%s: metaslab allocation failure: zio %p, " 327209c9d376SGeorge Wilson "size %llu, error %d", spa_name(spa), zio, zio->io_size, 327309c9d376SGeorge Wilson error); 3274e14bb325SJeff Bonwick if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) 3275e14bb325SJeff Bonwick return (zio_write_gang_block(zio)); 3276fa9e4066Sahrens zio->io_error = error; 3277fa9e4066Sahrens } 3278e05725b1Sbonwick 3279e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 3280fa9e4066Sahrens } 3281fa9e4066Sahrens 3282e05725b1Sbonwick static int 3283fa9e4066Sahrens zio_dva_free(zio_t *zio) 3284fa9e4066Sahrens { 3285e14bb325SJeff Bonwick metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); 3286fa9e4066Sahrens 3287e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 3288fa9e4066Sahrens } 3289fa9e4066Sahrens 3290e05725b1Sbonwick static int 3291fa9e4066Sahrens zio_dva_claim(zio_t *zio) 3292fa9e4066Sahrens { 3293e14bb325SJeff Bonwick int error; 3294e14bb325SJeff Bonwick 3295e14bb325SJeff Bonwick error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); 3296e14bb325SJeff Bonwick if (error) 3297e14bb325SJeff Bonwick zio->io_error = error; 3298fa9e4066Sahrens 3299e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 3300fa9e4066Sahrens } 3301fa9e4066Sahrens 3302e14bb325SJeff Bonwick /* 3303e14bb325SJeff Bonwick * Undo an allocation. This is used by zio_done() when an I/O fails 3304e14bb325SJeff Bonwick * and we want to give back the block we just allocated. 3305e14bb325SJeff Bonwick * This handles both normal blocks and gang blocks. 3306e14bb325SJeff Bonwick */ 3307e14bb325SJeff Bonwick static void 3308e14bb325SJeff Bonwick zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) 3309e14bb325SJeff Bonwick { 3310e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 3311b24ab676SJeff Bonwick ASSERT(zio->io_bp_override == NULL); 3312e14bb325SJeff Bonwick 3313e14bb325SJeff Bonwick if (!BP_IS_HOLE(bp)) 3314b24ab676SJeff Bonwick metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); 3315e14bb325SJeff Bonwick 3316e14bb325SJeff Bonwick if (gn != NULL) { 3317e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 3318e14bb325SJeff Bonwick zio_dva_unallocate(zio, gn->gn_child[g], 3319e14bb325SJeff Bonwick &gn->gn_gbh->zg_blkptr[g]); 3320e14bb325SJeff Bonwick } 3321e14bb325SJeff Bonwick } 3322e14bb325SJeff Bonwick } 3323e14bb325SJeff Bonwick 3324e14bb325SJeff Bonwick /* 3325e14bb325SJeff Bonwick * Try to allocate an intent log block. Return 0 on success, errno on failure. 3326e14bb325SJeff Bonwick */ 3327e14bb325SJeff Bonwick int 3328eb633035STom Caputi zio_alloc_zil(spa_t *spa, objset_t *os, uint64_t txg, blkptr_t *new_bp, 3329f78cdc34SPaul Dagnelie blkptr_t *old_bp, uint64_t size, boolean_t *slog) 3330e14bb325SJeff Bonwick { 3331e09fa4daSNeil Perrin int error = 1; 33328363e80aSGeorge Wilson zio_alloc_list_t io_alloc_list; 3333e14bb325SJeff Bonwick 3334b24ab676SJeff Bonwick ASSERT(txg > spa_syncing_txg(spa)); 3335b24ab676SJeff Bonwick 33368363e80aSGeorge Wilson metaslab_trace_init(&io_alloc_list); 3337663207adSDon Brady 3338663207adSDon Brady /* 3339663207adSDon Brady * Block pointer fields are useful to metaslabs for stats and debugging. 3340663207adSDon Brady * Fill in the obvious ones before calling into metaslab_alloc(). 3341663207adSDon Brady */ 3342663207adSDon Brady BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 3343663207adSDon Brady BP_SET_PSIZE(new_bp, size); 3344663207adSDon Brady BP_SET_LEVEL(new_bp, 0); 3345663207adSDon Brady 3346f78cdc34SPaul Dagnelie /* 3347f78cdc34SPaul Dagnelie * When allocating a zil block, we don't have information about 3348f78cdc34SPaul Dagnelie * the final destination of the block except the objset it's part 3349f78cdc34SPaul Dagnelie * of, so we just hash the objset ID to pick the allocator to get 3350f78cdc34SPaul Dagnelie * some parallelism. 3351f78cdc34SPaul Dagnelie */ 3352c5ee4681SAlexander Motin error = metaslab_alloc(spa, spa_log_class(spa), size, new_bp, 1, 3353f78cdc34SPaul Dagnelie txg, old_bp, METASLAB_HINTBP_AVOID, &io_alloc_list, NULL, 3354eb633035STom Caputi cityhash4(0, 0, 0, 3355eb633035STom Caputi os->os_dsl_dataset->ds_object) % spa->spa_alloc_count); 3356c5ee4681SAlexander Motin if (error == 0) { 3357c5ee4681SAlexander Motin *slog = TRUE; 3358c5ee4681SAlexander Motin } else { 3359b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), size, 33608363e80aSGeorge Wilson new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID, 3361eb633035STom Caputi &io_alloc_list, NULL, cityhash4(0, 0, 0, 3362eb633035STom Caputi os->os_dsl_dataset->ds_object) % spa->spa_alloc_count); 3363c5ee4681SAlexander Motin if (error == 0) 3364c5ee4681SAlexander Motin *slog = FALSE; 3365840345f6SGeorge Wilson } 33668363e80aSGeorge Wilson metaslab_trace_fini(&io_alloc_list); 3367e14bb325SJeff Bonwick 3368e14bb325SJeff Bonwick if (error == 0) { 3369e14bb325SJeff Bonwick BP_SET_LSIZE(new_bp, size); 3370e14bb325SJeff Bonwick BP_SET_PSIZE(new_bp, size); 3371e14bb325SJeff Bonwick BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); 33726e1f5caaSNeil Perrin BP_SET_CHECKSUM(new_bp, 33736e1f5caaSNeil Perrin spa_version(spa) >= SPA_VERSION_SLIM_ZIL 33746e1f5caaSNeil Perrin ? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG); 3375e14bb325SJeff Bonwick BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 3376e14bb325SJeff Bonwick BP_SET_LEVEL(new_bp, 0); 3377b24ab676SJeff Bonwick BP_SET_DEDUP(new_bp, 0); 3378e14bb325SJeff Bonwick BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); 3379eb633035STom Caputi 3380eb633035STom Caputi /* 3381eb633035STom Caputi * encrypted blocks will require an IV and salt. We generate 3382eb633035STom Caputi * these now since we will not be rewriting the bp at 3383eb633035STom Caputi * rewrite time. 3384eb633035STom Caputi */ 3385eb633035STom Caputi if (os->os_encrypted) { 3386eb633035STom Caputi uint8_t iv[ZIO_DATA_IV_LEN]; 3387eb633035STom Caputi uint8_t salt[ZIO_DATA_SALT_LEN]; 3388eb633035STom Caputi 3389eb633035STom Caputi BP_SET_CRYPT(new_bp, B_TRUE); 3390eb633035STom Caputi VERIFY0(spa_crypt_get_salt(spa, 3391eb633035STom Caputi dmu_objset_id(os), salt)); 3392eb633035STom Caputi VERIFY0(zio_crypt_generate_iv(iv)); 3393eb633035STom Caputi 3394eb633035STom Caputi zio_crypt_encode_params_bp(new_bp, salt, iv); 3395eb633035STom Caputi } 33961271e4b1SPrakash Surya } else { 33971271e4b1SPrakash Surya zfs_dbgmsg("%s: zil block allocation failure: " 33981271e4b1SPrakash Surya "size %llu, error %d", spa_name(spa), size, error); 3399e14bb325SJeff Bonwick } 3400e14bb325SJeff Bonwick 3401e14bb325SJeff Bonwick return (error); 3402e14bb325SJeff Bonwick } 3403e14bb325SJeff Bonwick 3404fa9e4066Sahrens /* 3405fa9e4066Sahrens * ========================================================================== 3406fa9e4066Sahrens * Read and write to physical devices 3407fa9e4066Sahrens * ========================================================================== 3408fa9e4066Sahrens */ 3409738f37bcSGeorge Wilson 3410738f37bcSGeorge Wilson /* 3411738f37bcSGeorge Wilson * Issue an I/O to the underlying vdev. Typically the issue pipeline 3412738f37bcSGeorge Wilson * stops after this stage and will resume upon I/O completion. 3413738f37bcSGeorge Wilson * However, there are instances where the vdev layer may need to 3414738f37bcSGeorge Wilson * continue the pipeline when an I/O was not issued. Since the I/O 3415738f37bcSGeorge Wilson * that was sent to the vdev layer might be different than the one 3416738f37bcSGeorge Wilson * currently active in the pipeline (see vdev_queue_io()), we explicitly 3417738f37bcSGeorge Wilson * force the underlying vdev layers to call either zio_execute() or 3418738f37bcSGeorge Wilson * zio_interrupt() to ensure that the pipeline continues with the correct I/O. 3419738f37bcSGeorge Wilson */ 3420e05725b1Sbonwick static int 342144cd46caSbillm zio_vdev_io_start(zio_t *zio) 3422fa9e4066Sahrens { 3423fa9e4066Sahrens vdev_t *vd = zio->io_vd; 342444cd46caSbillm uint64_t align; 34250a4e9518Sgw spa_t *spa = zio->io_spa; 34260a4e9518Sgw 3427dd50e0ccSTony Hutter zio->io_delay = 0; 3428dd50e0ccSTony Hutter 3429e14bb325SJeff Bonwick ASSERT(zio->io_error == 0); 3430e14bb325SJeff Bonwick ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); 3431fa9e4066Sahrens 3432e14bb325SJeff Bonwick if (vd == NULL) { 3433e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 3434e14bb325SJeff Bonwick spa_config_enter(spa, SCL_ZIO, zio, RW_READER); 3435fa9e4066Sahrens 3436e14bb325SJeff Bonwick /* 3437e14bb325SJeff Bonwick * The mirror_ops handle multiple DVAs in a single BP. 3438e14bb325SJeff Bonwick */ 3439738f37bcSGeorge Wilson vdev_mirror_ops.vdev_op_io_start(zio); 3440738f37bcSGeorge Wilson return (ZIO_PIPELINE_STOP); 3441fa9e4066Sahrens } 3442fa9e4066Sahrens 34430f7643c7SGeorge Wilson ASSERT3P(zio->io_logical, !=, zio); 34446f793812SPavel Zakharov if (zio->io_type == ZIO_TYPE_WRITE) { 34456f793812SPavel Zakharov ASSERT(spa->spa_trust_config); 34466f793812SPavel Zakharov 3447a3874b8bSToomas Soome /* 3448a3874b8bSToomas Soome * Note: the code can handle other kinds of writes, 3449a3874b8bSToomas Soome * but we don't expect them. 3450a3874b8bSToomas Soome */ 34516f793812SPavel Zakharov if (zio->io_vd->vdev_removing) { 34526f793812SPavel Zakharov ASSERT(zio->io_flags & 34536f793812SPavel Zakharov (ZIO_FLAG_PHYSICAL | ZIO_FLAG_SELF_HEAL | 34543a4b1be9SMatthew Ahrens ZIO_FLAG_RESILVER | ZIO_FLAG_INDUCE_DAMAGE)); 34556f793812SPavel Zakharov } 34565cabbc6bSPrashanth Sreenivasa } 34570f7643c7SGeorge Wilson 3458e14bb325SJeff Bonwick align = 1ULL << vd->vdev_top->vdev_ashift; 3459e14bb325SJeff Bonwick 34602a104a52SAlex Reece if (!(zio->io_flags & ZIO_FLAG_PHYSICAL) && 34612a104a52SAlex Reece P2PHASE(zio->io_size, align) != 0) { 34622a104a52SAlex Reece /* Transform logical writes to be a full physical block size. */ 3463ecc2d604Sbonwick uint64_t asize = P2ROUNDUP(zio->io_size, align); 3464770499e1SDan Kimmel abd_t *abuf = abd_alloc_sametype(zio->io_abd, asize); 3465e14bb325SJeff Bonwick ASSERT(vd == vd->vdev_top); 3466ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_WRITE) { 3467770499e1SDan Kimmel abd_copy(abuf, zio->io_abd, zio->io_size); 3468770499e1SDan Kimmel abd_zero_off(abuf, zio->io_size, asize - zio->io_size); 3469ecc2d604Sbonwick } 3470e14bb325SJeff Bonwick zio_push_transform(zio, abuf, asize, asize, zio_subblock); 3471ecc2d604Sbonwick } 3472ecc2d604Sbonwick 34732a104a52SAlex Reece /* 34742a104a52SAlex Reece * If this is not a physical io, make sure that it is properly aligned 34752a104a52SAlex Reece * before proceeding. 34762a104a52SAlex Reece */ 34772a104a52SAlex Reece if (!(zio->io_flags & ZIO_FLAG_PHYSICAL)) { 34782a104a52SAlex Reece ASSERT0(P2PHASE(zio->io_offset, align)); 34792a104a52SAlex Reece ASSERT0(P2PHASE(zio->io_size, align)); 34802a104a52SAlex Reece } else { 34812a104a52SAlex Reece /* 34822a104a52SAlex Reece * For physical writes, we allow 512b aligned writes and assume 34832a104a52SAlex Reece * the device will perform a read-modify-write as necessary. 34842a104a52SAlex Reece */ 34852a104a52SAlex Reece ASSERT0(P2PHASE(zio->io_offset, SPA_MINBLOCKSIZE)); 34862a104a52SAlex Reece ASSERT0(P2PHASE(zio->io_size, SPA_MINBLOCKSIZE)); 34872a104a52SAlex Reece } 34882a104a52SAlex Reece 3489f9af39baSGeorge Wilson VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); 34908ad4d6ddSJeff Bonwick 34918ad4d6ddSJeff Bonwick /* 34928ad4d6ddSJeff Bonwick * If this is a repair I/O, and there's no self-healing involved -- 34938ad4d6ddSJeff Bonwick * that is, we're just resilvering what we expect to resilver -- 34948ad4d6ddSJeff Bonwick * then don't do the I/O unless zio's txg is actually in vd's DTL. 34953a4b1be9SMatthew Ahrens * This prevents spurious resilvering. 34963a4b1be9SMatthew Ahrens * 34973a4b1be9SMatthew Ahrens * There are a few ways that we can end up creating these spurious 34983a4b1be9SMatthew Ahrens * resilver i/os: 34993a4b1be9SMatthew Ahrens * 35003a4b1be9SMatthew Ahrens * 1. A resilver i/o will be issued if any DVA in the BP has a 35013a4b1be9SMatthew Ahrens * dirty DTL. The mirror code will issue resilver writes to 35023a4b1be9SMatthew Ahrens * each DVA, including the one(s) that are not on vdevs with dirty 35033a4b1be9SMatthew Ahrens * DTLs. 35043a4b1be9SMatthew Ahrens * 35053a4b1be9SMatthew Ahrens * 2. With nested replication, which happens when we have a 35063a4b1be9SMatthew Ahrens * "replacing" or "spare" vdev that's a child of a mirror or raidz. 35073a4b1be9SMatthew Ahrens * For example, given mirror(replacing(A+B), C), it's likely that 35083a4b1be9SMatthew Ahrens * only A is out of date (it's the new device). In this case, we'll 35093a4b1be9SMatthew Ahrens * read from C, then use the data to resilver A+B -- but we don't 35103a4b1be9SMatthew Ahrens * actually want to resilver B, just A. The top-level mirror has no 35113a4b1be9SMatthew Ahrens * way to know this, so instead we just discard unnecessary repairs 35123a4b1be9SMatthew Ahrens * as we work our way down the vdev tree. 35133a4b1be9SMatthew Ahrens * 35143a4b1be9SMatthew Ahrens * 3. ZTEST also creates mirrors of mirrors, mirrors of raidz, etc. 35153a4b1be9SMatthew Ahrens * The same logic applies to any form of nested replication: ditto 35163a4b1be9SMatthew Ahrens * + mirror, RAID-Z + replacing, etc. 35173a4b1be9SMatthew Ahrens * 35183a4b1be9SMatthew Ahrens * However, indirect vdevs point off to other vdevs which may have 35193a4b1be9SMatthew Ahrens * DTL's, so we never bypass them. The child i/os on concrete vdevs 35203a4b1be9SMatthew Ahrens * will be properly bypassed instead. 35218ad4d6ddSJeff Bonwick */ 35228ad4d6ddSJeff Bonwick if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && 35238ad4d6ddSJeff Bonwick !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && 35248ad4d6ddSJeff Bonwick zio->io_txg != 0 && /* not a delegated i/o */ 35253a4b1be9SMatthew Ahrens vd->vdev_ops != &vdev_indirect_ops && 35268ad4d6ddSJeff Bonwick !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { 35278ad4d6ddSJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 35288ad4d6ddSJeff Bonwick zio_vdev_io_bypass(zio); 35298ad4d6ddSJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 35308ad4d6ddSJeff Bonwick } 3531fa9e4066Sahrens 3532084fd14fSBrian Behlendorf if (vd->vdev_ops->vdev_op_leaf && (zio->io_type == ZIO_TYPE_READ || 3533084fd14fSBrian Behlendorf zio->io_type == ZIO_TYPE_WRITE || zio->io_type == ZIO_TYPE_TRIM)) { 3534e14bb325SJeff Bonwick 353543466aaeSMax Grossman if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio)) 3536a3f829aeSBill Moore return (ZIO_PIPELINE_CONTINUE); 3537e14bb325SJeff Bonwick 3538e14bb325SJeff Bonwick if ((zio = vdev_queue_io(zio)) == NULL) 3539e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3540e14bb325SJeff Bonwick 3541e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 3542be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(ENXIO); 3543e14bb325SJeff Bonwick zio_interrupt(zio); 3544e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3545e14bb325SJeff Bonwick } 3546dd50e0ccSTony Hutter zio->io_delay = gethrtime(); 3547e14bb325SJeff Bonwick } 3548e14bb325SJeff Bonwick 3549738f37bcSGeorge Wilson vd->vdev_ops->vdev_op_io_start(zio); 3550738f37bcSGeorge Wilson return (ZIO_PIPELINE_STOP); 3551fa9e4066Sahrens } 3552fa9e4066Sahrens 3553e05725b1Sbonwick static int 3554fa9e4066Sahrens zio_vdev_io_done(zio_t *zio) 3555fa9e4066Sahrens { 3556e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 3557e14bb325SJeff Bonwick vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; 3558e14bb325SJeff Bonwick boolean_t unexpected_error = B_FALSE; 3559e05725b1Sbonwick 3560d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_VDEV_BIT, ZIO_WAIT_DONE)) { 3561e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3562d6e1c446SGeorge Wilson } 3563fa9e4066Sahrens 3564084fd14fSBrian Behlendorf ASSERT(zio->io_type == ZIO_TYPE_READ || 3565084fd14fSBrian Behlendorf zio->io_type == ZIO_TYPE_WRITE || zio->io_type == ZIO_TYPE_TRIM); 3566e14bb325SJeff Bonwick 3567dd50e0ccSTony Hutter if (zio->io_delay) 3568dd50e0ccSTony Hutter zio->io_delay = gethrtime() - zio->io_delay; 3569dd50e0ccSTony Hutter 3570e14bb325SJeff Bonwick if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { 3571e14bb325SJeff Bonwick 3572e14bb325SJeff Bonwick vdev_queue_io_done(zio); 3573fa9e4066Sahrens 3574e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE) 3575e14bb325SJeff Bonwick vdev_cache_write(zio); 3576e14bb325SJeff Bonwick 3577e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 35788956713aSEric Schrock zio->io_error = zio_handle_device_injection(vd, 35798956713aSEric Schrock zio, EIO); 3580e14bb325SJeff Bonwick 3581e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 3582e14bb325SJeff Bonwick zio->io_error = zio_handle_label_injection(zio, EIO); 3583e14bb325SJeff Bonwick 3584084fd14fSBrian Behlendorf if (zio->io_error && zio->io_type != ZIO_TYPE_TRIM) { 3585e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 3586be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(ENXIO); 3587e14bb325SJeff Bonwick } else { 3588e14bb325SJeff Bonwick unexpected_error = B_TRUE; 3589e14bb325SJeff Bonwick } 3590e14bb325SJeff Bonwick } 359151ece835Seschrock } 3592fa9e4066Sahrens 3593e14bb325SJeff Bonwick ops->vdev_op_io_done(zio); 3594e14bb325SJeff Bonwick 3595e14bb325SJeff Bonwick if (unexpected_error) 3596a3f829aeSBill Moore VERIFY(vdev_probe(vd, zio) == NULL); 3597e14bb325SJeff Bonwick 3598e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 3599fa9e4066Sahrens } 3600fa9e4066Sahrens 3601a3874b8bSToomas Soome /* 3602a3874b8bSToomas Soome * This function is used to change the priority of an existing zio that is 3603a3874b8bSToomas Soome * currently in-flight. This is used by the arc to upgrade priority in the 3604a3874b8bSToomas Soome * event that a demand read is made for a block that is currently queued 3605a3874b8bSToomas Soome * as a scrub or async read IO. Otherwise, the high priority read request 3606a3874b8bSToomas Soome * would end up having to wait for the lower priority IO. 3607a3874b8bSToomas Soome */ 3608a3874b8bSToomas Soome void 3609a3874b8bSToomas Soome zio_change_priority(zio_t *pio, zio_priority_t priority) 3610a3874b8bSToomas Soome { 3611a3874b8bSToomas Soome zio_t *cio, *cio_next; 3612a3874b8bSToomas Soome zio_link_t *zl = NULL; 3613a3874b8bSToomas Soome 3614a3874b8bSToomas Soome ASSERT3U(priority, <, ZIO_PRIORITY_NUM_QUEUEABLE); 3615a3874b8bSToomas Soome 3616a3874b8bSToomas Soome if (pio->io_vd != NULL && pio->io_vd->vdev_ops->vdev_op_leaf) { 3617a3874b8bSToomas Soome vdev_queue_change_io_priority(pio, priority); 3618a3874b8bSToomas Soome } else { 3619a3874b8bSToomas Soome pio->io_priority = priority; 3620a3874b8bSToomas Soome } 3621a3874b8bSToomas Soome 3622a3874b8bSToomas Soome mutex_enter(&pio->io_lock); 3623a3874b8bSToomas Soome for (cio = zio_walk_children(pio, &zl); cio != NULL; cio = cio_next) { 3624a3874b8bSToomas Soome cio_next = zio_walk_children(pio, &zl); 3625a3874b8bSToomas Soome zio_change_priority(cio, priority); 3626a3874b8bSToomas Soome } 3627a3874b8bSToomas Soome mutex_exit(&pio->io_lock); 3628a3874b8bSToomas Soome } 3629a3874b8bSToomas Soome 363022fe2c88SJonathan Adams /* 363122fe2c88SJonathan Adams * For non-raidz ZIOs, we can just copy aside the bad data read from the 363222fe2c88SJonathan Adams * disk, and use that to finish the checksum ereport later. 363322fe2c88SJonathan Adams */ 363422fe2c88SJonathan Adams static void 363522fe2c88SJonathan Adams zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, 3636eb633035STom Caputi const abd_t *good_buf) 363722fe2c88SJonathan Adams { 363822fe2c88SJonathan Adams /* no processing needed */ 363922fe2c88SJonathan Adams zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); 364022fe2c88SJonathan Adams } 364122fe2c88SJonathan Adams 364222fe2c88SJonathan Adams /*ARGSUSED*/ 364322fe2c88SJonathan Adams void 364422fe2c88SJonathan Adams zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) 364522fe2c88SJonathan Adams { 3646eb633035STom Caputi void *abd = abd_alloc_sametype(zio->io_abd, zio->io_size); 364722fe2c88SJonathan Adams 3648eb633035STom Caputi abd_copy(abd, zio->io_abd, zio->io_size); 364922fe2c88SJonathan Adams 365022fe2c88SJonathan Adams zcr->zcr_cbinfo = zio->io_size; 3651eb633035STom Caputi zcr->zcr_cbdata = abd; 365222fe2c88SJonathan Adams zcr->zcr_finish = zio_vsd_default_cksum_finish; 3653eb633035STom Caputi zcr->zcr_free = zio_abd_free; 365422fe2c88SJonathan Adams } 365522fe2c88SJonathan Adams 3656e05725b1Sbonwick static int 3657fa9e4066Sahrens zio_vdev_io_assess(zio_t *zio) 3658fa9e4066Sahrens { 3659fa9e4066Sahrens vdev_t *vd = zio->io_vd; 3660e14bb325SJeff Bonwick 3661d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_VDEV_BIT, ZIO_WAIT_DONE)) { 3662e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3663d6e1c446SGeorge Wilson } 3664e14bb325SJeff Bonwick 3665e14bb325SJeff Bonwick if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 3666e14bb325SJeff Bonwick spa_config_exit(zio->io_spa, SCL_ZIO, zio); 3667e14bb325SJeff Bonwick 3668e14bb325SJeff Bonwick if (zio->io_vsd != NULL) { 366922fe2c88SJonathan Adams zio->io_vsd_ops->vsd_free(zio); 3670e14bb325SJeff Bonwick zio->io_vsd = NULL; 3671ecc2d604Sbonwick } 3672ecc2d604Sbonwick 3673e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 3674ea8dc4b6Seschrock zio->io_error = zio_handle_fault_injection(zio, EIO); 3675ea8dc4b6Seschrock 3676fa9e4066Sahrens /* 3677fa9e4066Sahrens * If the I/O failed, determine whether we should attempt to retry it. 367835a5a358SJonathan Adams * 367935a5a358SJonathan Adams * On retry, we cut in line in the issue queue, since we don't want 368035a5a358SJonathan Adams * compression/checksumming/etc. work to prevent our (cheap) IO reissue. 3681fa9e4066Sahrens */ 3682e14bb325SJeff Bonwick if (zio->io_error && vd == NULL && 3683e14bb325SJeff Bonwick !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { 3684e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ 3685e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ 3686fa9e4066Sahrens zio->io_error = 0; 3687e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_RETRY | 3688e14bb325SJeff Bonwick ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; 3689b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; 369035a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, 369135a5a358SJonathan Adams zio_requeue_io_start_cut_in_line); 3692e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3693ea8dc4b6Seschrock } 3694fa9e4066Sahrens 3695e14bb325SJeff Bonwick /* 3696e14bb325SJeff Bonwick * If we got an error on a leaf device, convert it to ENXIO 3697e14bb325SJeff Bonwick * if the device is not accessible at all. 3698e14bb325SJeff Bonwick */ 3699e14bb325SJeff Bonwick if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && 3700e14bb325SJeff Bonwick !vdev_accessible(vd, zio)) 3701be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(ENXIO); 3702e14bb325SJeff Bonwick 3703e14bb325SJeff Bonwick /* 3704e14bb325SJeff Bonwick * If we can't write to an interior vdev (mirror or RAID-Z), 3705e14bb325SJeff Bonwick * set vdev_cant_write so that we stop trying to allocate from it. 3706e14bb325SJeff Bonwick */ 3707e14bb325SJeff Bonwick if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && 37083b2aab18SMatthew Ahrens vd != NULL && !vd->vdev_ops->vdev_op_leaf) { 3709e14bb325SJeff Bonwick vd->vdev_cant_write = B_TRUE; 37103b2aab18SMatthew Ahrens } 3711e14bb325SJeff Bonwick 3712295438baSHans Rosenfeld /* 3713295438baSHans Rosenfeld * If a cache flush returns ENOTSUP or ENOTTY, we know that no future 3714084fd14fSBrian Behlendorf * attempts will ever succeed. In this case we set a persistent 3715084fd14fSBrian Behlendorf * boolean flag so that we don't bother with it in the future. 3716295438baSHans Rosenfeld */ 3717295438baSHans Rosenfeld if ((zio->io_error == ENOTSUP || zio->io_error == ENOTTY) && 3718295438baSHans Rosenfeld zio->io_type == ZIO_TYPE_IOCTL && 3719295438baSHans Rosenfeld zio->io_cmd == DKIOCFLUSHWRITECACHE && vd != NULL) 3720295438baSHans Rosenfeld vd->vdev_nowritecache = B_TRUE; 3721295438baSHans Rosenfeld 3722e14bb325SJeff Bonwick if (zio->io_error) 3723e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 3724e14bb325SJeff Bonwick 372569962b56SMatthew Ahrens if (vd != NULL && vd->vdev_ops->vdev_op_leaf && 372669962b56SMatthew Ahrens zio->io_physdone != NULL) { 372769962b56SMatthew Ahrens ASSERT(!(zio->io_flags & ZIO_FLAG_DELEGATED)); 372869962b56SMatthew Ahrens ASSERT(zio->io_child_type == ZIO_CHILD_VDEV); 372969962b56SMatthew Ahrens zio->io_physdone(zio->io_logical); 373069962b56SMatthew Ahrens } 373169962b56SMatthew Ahrens 3732e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 3733fa9e4066Sahrens } 3734fa9e4066Sahrens 3735fa9e4066Sahrens void 3736fa9e4066Sahrens zio_vdev_io_reissue(zio_t *zio) 3737fa9e4066Sahrens { 3738fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 3739fa9e4066Sahrens ASSERT(zio->io_error == 0); 3740fa9e4066Sahrens 3741b24ab676SJeff Bonwick zio->io_stage >>= 1; 3742fa9e4066Sahrens } 3743fa9e4066Sahrens 3744fa9e4066Sahrens void 3745fa9e4066Sahrens zio_vdev_io_redone(zio_t *zio) 3746fa9e4066Sahrens { 3747fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); 3748fa9e4066Sahrens 3749b24ab676SJeff Bonwick zio->io_stage >>= 1; 3750fa9e4066Sahrens } 3751fa9e4066Sahrens 3752fa9e4066Sahrens void 3753fa9e4066Sahrens zio_vdev_io_bypass(zio_t *zio) 3754fa9e4066Sahrens { 3755fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 3756fa9e4066Sahrens ASSERT(zio->io_error == 0); 3757fa9e4066Sahrens 3758fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_IO_BYPASS; 3759b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; 3760fa9e4066Sahrens } 3761fa9e4066Sahrens 3762eb633035STom Caputi /* 3763eb633035STom Caputi * ========================================================================== 3764eb633035STom Caputi * Encrypt and store encryption parameters 3765eb633035STom Caputi * ========================================================================== 3766eb633035STom Caputi */ 3767eb633035STom Caputi 3768eb633035STom Caputi 3769eb633035STom Caputi /* 3770eb633035STom Caputi * This function is used for ZIO_STAGE_ENCRYPT. It is responsible for 3771eb633035STom Caputi * managing the storage of encryption parameters and passing them to the 3772eb633035STom Caputi * lower-level encryption functions. 3773eb633035STom Caputi */ 3774eb633035STom Caputi static int 3775eb633035STom Caputi zio_encrypt(zio_t *zio) 3776eb633035STom Caputi { 3777eb633035STom Caputi zio_prop_t *zp = &zio->io_prop; 3778eb633035STom Caputi spa_t *spa = zio->io_spa; 3779eb633035STom Caputi blkptr_t *bp = zio->io_bp; 3780eb633035STom Caputi uint64_t psize = BP_GET_PSIZE(bp); 3781eb633035STom Caputi uint64_t dsobj = zio->io_bookmark.zb_objset; 3782eb633035STom Caputi dmu_object_type_t ot = BP_GET_TYPE(bp); 3783eb633035STom Caputi void *enc_buf = NULL; 3784eb633035STom Caputi abd_t *eabd = NULL; 3785eb633035STom Caputi uint8_t salt[ZIO_DATA_SALT_LEN]; 3786eb633035STom Caputi uint8_t iv[ZIO_DATA_IV_LEN]; 3787eb633035STom Caputi uint8_t mac[ZIO_DATA_MAC_LEN]; 3788eb633035STom Caputi boolean_t no_crypt = B_FALSE; 3789eb633035STom Caputi 3790eb633035STom Caputi /* the root zio already encrypted the data */ 3791eb633035STom Caputi if (zio->io_child_type == ZIO_CHILD_GANG) 3792eb633035STom Caputi return (ZIO_PIPELINE_CONTINUE); 3793eb633035STom Caputi 3794eb633035STom Caputi /* only ZIL blocks are re-encrypted on rewrite */ 3795eb633035STom Caputi if (!IO_IS_ALLOCATING(zio) && ot != DMU_OT_INTENT_LOG) 3796eb633035STom Caputi return (ZIO_PIPELINE_CONTINUE); 3797eb633035STom Caputi 3798eb633035STom Caputi if (!(zp->zp_encrypt || BP_IS_ENCRYPTED(bp))) { 3799eb633035STom Caputi BP_SET_CRYPT(bp, B_FALSE); 3800eb633035STom Caputi return (ZIO_PIPELINE_CONTINUE); 3801eb633035STom Caputi } 3802eb633035STom Caputi 3803eb633035STom Caputi /* if we are doing raw encryption set the provided encryption params */ 3804eb633035STom Caputi if (zio->io_flags & ZIO_FLAG_RAW_ENCRYPT) { 3805eb633035STom Caputi ASSERT0(BP_GET_LEVEL(bp)); 3806eb633035STom Caputi BP_SET_CRYPT(bp, B_TRUE); 3807eb633035STom Caputi BP_SET_BYTEORDER(bp, zp->zp_byteorder); 3808eb633035STom Caputi if (ot != DMU_OT_OBJSET) 3809eb633035STom Caputi zio_crypt_encode_mac_bp(bp, zp->zp_mac); 3810eb633035STom Caputi 3811eb633035STom Caputi /* dnode blocks must be written out in the provided byteorder */ 3812eb633035STom Caputi if (zp->zp_byteorder != ZFS_HOST_BYTEORDER && 3813eb633035STom Caputi ot == DMU_OT_DNODE) { 3814eb633035STom Caputi void *bswap_buf = zio_buf_alloc(psize); 3815eb633035STom Caputi abd_t *babd = abd_get_from_buf(bswap_buf, psize); 3816eb633035STom Caputi 3817eb633035STom Caputi ASSERT3U(BP_GET_COMPRESS(bp), ==, ZIO_COMPRESS_OFF); 3818eb633035STom Caputi abd_copy_to_buf(bswap_buf, zio->io_abd, psize); 3819eb633035STom Caputi dmu_ot_byteswap[DMU_OT_BYTESWAP(ot)].ob_func(bswap_buf, 3820eb633035STom Caputi psize); 3821eb633035STom Caputi 3822eb633035STom Caputi abd_take_ownership_of_buf(babd, B_TRUE); 3823eb633035STom Caputi zio_push_transform(zio, babd, psize, psize, NULL); 3824eb633035STom Caputi } 3825eb633035STom Caputi 3826eb633035STom Caputi if (DMU_OT_IS_ENCRYPTED(ot)) 3827eb633035STom Caputi zio_crypt_encode_params_bp(bp, zp->zp_salt, zp->zp_iv); 3828eb633035STom Caputi return (ZIO_PIPELINE_CONTINUE); 3829eb633035STom Caputi } 3830eb633035STom Caputi 3831eb633035STom Caputi /* indirect blocks only maintain a cksum of the lower level MACs */ 3832eb633035STom Caputi if (BP_GET_LEVEL(bp) > 0) { 3833eb633035STom Caputi BP_SET_CRYPT(bp, B_TRUE); 3834eb633035STom Caputi VERIFY0(zio_crypt_do_indirect_mac_checksum_abd(B_TRUE, 3835eb633035STom Caputi zio->io_orig_abd, BP_GET_LSIZE(bp), BP_SHOULD_BYTESWAP(bp), 3836eb633035STom Caputi mac)); 3837eb633035STom Caputi zio_crypt_encode_mac_bp(bp, mac); 3838eb633035STom Caputi return (ZIO_PIPELINE_CONTINUE); 3839eb633035STom Caputi } 3840eb633035STom Caputi 3841eb633035STom Caputi /* 3842eb633035STom Caputi * Objset blocks are a special case since they have 2 256-bit MACs 3843eb633035STom Caputi * embedded within them. 3844eb633035STom Caputi */ 3845eb633035STom Caputi if (ot == DMU_OT_OBJSET) { 3846eb633035STom Caputi ASSERT0(DMU_OT_IS_ENCRYPTED(ot)); 3847eb633035STom Caputi ASSERT3U(BP_GET_COMPRESS(bp), ==, ZIO_COMPRESS_OFF); 3848eb633035STom Caputi BP_SET_CRYPT(bp, B_TRUE); 3849eb633035STom Caputi VERIFY0(spa_do_crypt_objset_mac_abd(B_TRUE, spa, dsobj, 3850eb633035STom Caputi zio->io_abd, psize, BP_SHOULD_BYTESWAP(bp))); 3851eb633035STom Caputi return (ZIO_PIPELINE_CONTINUE); 3852eb633035STom Caputi } 3853eb633035STom Caputi 3854eb633035STom Caputi /* unencrypted object types are only authenticated with a MAC */ 3855eb633035STom Caputi if (!DMU_OT_IS_ENCRYPTED(ot)) { 3856eb633035STom Caputi BP_SET_CRYPT(bp, B_TRUE); 3857eb633035STom Caputi VERIFY0(spa_do_crypt_mac_abd(B_TRUE, spa, dsobj, 3858eb633035STom Caputi zio->io_abd, psize, mac)); 3859eb633035STom Caputi zio_crypt_encode_mac_bp(bp, mac); 3860eb633035STom Caputi return (ZIO_PIPELINE_CONTINUE); 3861eb633035STom Caputi } 3862eb633035STom Caputi 3863eb633035STom Caputi /* 3864eb633035STom Caputi * Later passes of sync-to-convergence may decide to rewrite data 3865eb633035STom Caputi * in place to avoid more disk reallocations. This presents a problem 3866eb633035STom Caputi * for encryption because this consitutes rewriting the new data with 3867eb633035STom Caputi * the same encryption key and IV. However, this only applies to blocks 3868eb633035STom Caputi * in the MOS (particularly the spacemaps) and we do not encrypt the 3869eb633035STom Caputi * MOS. We assert that the zio is allocating or an intent log write 3870eb633035STom Caputi * to enforce this. 3871eb633035STom Caputi */ 3872eb633035STom Caputi ASSERT(IO_IS_ALLOCATING(zio) || ot == DMU_OT_INTENT_LOG); 3873eb633035STom Caputi ASSERT(BP_GET_LEVEL(bp) == 0 || ot == DMU_OT_INTENT_LOG); 3874eb633035STom Caputi ASSERT(spa_feature_is_active(spa, SPA_FEATURE_ENCRYPTION)); 3875eb633035STom Caputi ASSERT3U(psize, !=, 0); 3876eb633035STom Caputi 3877eb633035STom Caputi enc_buf = zio_buf_alloc(psize); 3878eb633035STom Caputi eabd = abd_get_from_buf(enc_buf, psize); 3879eb633035STom Caputi abd_take_ownership_of_buf(eabd, B_TRUE); 3880eb633035STom Caputi 3881eb633035STom Caputi /* 3882eb633035STom Caputi * For an explanation of what encryption parameters are stored 3883eb633035STom Caputi * where, see the block comment in zio_crypt.c. 3884eb633035STom Caputi */ 3885eb633035STom Caputi if (ot == DMU_OT_INTENT_LOG) { 3886eb633035STom Caputi zio_crypt_decode_params_bp(bp, salt, iv); 3887eb633035STom Caputi } else { 3888eb633035STom Caputi BP_SET_CRYPT(bp, B_TRUE); 3889eb633035STom Caputi } 3890eb633035STom Caputi 3891eb633035STom Caputi /* Perform the encryption. This should not fail */ 3892eb633035STom Caputi VERIFY0(spa_do_crypt_abd(B_TRUE, spa, &zio->io_bookmark, 3893eb633035STom Caputi BP_GET_TYPE(bp), BP_GET_DEDUP(bp), BP_SHOULD_BYTESWAP(bp), 3894eb633035STom Caputi salt, iv, mac, psize, zio->io_abd, eabd, &no_crypt)); 3895eb633035STom Caputi 3896eb633035STom Caputi /* encode encryption metadata into the bp */ 3897eb633035STom Caputi if (ot == DMU_OT_INTENT_LOG) { 3898eb633035STom Caputi /* 3899eb633035STom Caputi * ZIL blocks store the MAC in the embedded checksum, so the 3900eb633035STom Caputi * transform must always be applied. 3901eb633035STom Caputi */ 3902eb633035STom Caputi zio_crypt_encode_mac_zil(enc_buf, mac); 3903eb633035STom Caputi zio_push_transform(zio, eabd, psize, psize, NULL); 3904eb633035STom Caputi } else { 3905eb633035STom Caputi BP_SET_CRYPT(bp, B_TRUE); 3906eb633035STom Caputi zio_crypt_encode_params_bp(bp, salt, iv); 3907eb633035STom Caputi zio_crypt_encode_mac_bp(bp, mac); 3908eb633035STom Caputi 3909eb633035STom Caputi if (no_crypt) { 3910eb633035STom Caputi ASSERT3U(ot, ==, DMU_OT_DNODE); 3911eb633035STom Caputi abd_free(eabd); 3912eb633035STom Caputi } else { 3913eb633035STom Caputi zio_push_transform(zio, eabd, psize, psize, NULL); 3914eb633035STom Caputi } 3915eb633035STom Caputi } 3916eb633035STom Caputi 3917eb633035STom Caputi return (ZIO_PIPELINE_CONTINUE); 3918eb633035STom Caputi } 3919eb633035STom Caputi 3920fa9e4066Sahrens /* 3921fa9e4066Sahrens * ========================================================================== 3922fa9e4066Sahrens * Generate and verify checksums 3923fa9e4066Sahrens * ========================================================================== 3924fa9e4066Sahrens */ 3925e05725b1Sbonwick static int 3926fa9e4066Sahrens zio_checksum_generate(zio_t *zio) 3927fa9e4066Sahrens { 3928fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 3929e14bb325SJeff Bonwick enum zio_checksum checksum; 3930fa9e4066Sahrens 3931e14bb325SJeff Bonwick if (bp == NULL) { 3932e14bb325SJeff Bonwick /* 3933e14bb325SJeff Bonwick * This is zio_write_phys(). 3934e14bb325SJeff Bonwick * We're either generating a label checksum, or none at all. 3935e14bb325SJeff Bonwick */ 3936e14bb325SJeff Bonwick checksum = zio->io_prop.zp_checksum; 3937e14bb325SJeff Bonwick 3938e14bb325SJeff Bonwick if (checksum == ZIO_CHECKSUM_OFF) 3939e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 3940fa9e4066Sahrens 3941e14bb325SJeff Bonwick ASSERT(checksum == ZIO_CHECKSUM_LABEL); 3942e14bb325SJeff Bonwick } else { 3943e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { 3944e14bb325SJeff Bonwick ASSERT(!IO_IS_ALLOCATING(zio)); 3945e14bb325SJeff Bonwick checksum = ZIO_CHECKSUM_GANG_HEADER; 3946e14bb325SJeff Bonwick } else { 3947e14bb325SJeff Bonwick checksum = BP_GET_CHECKSUM(bp); 3948e14bb325SJeff Bonwick } 3949e14bb325SJeff Bonwick } 3950fa9e4066Sahrens 3951770499e1SDan Kimmel zio_checksum_compute(zio, checksum, zio->io_abd, zio->io_size); 3952fa9e4066Sahrens 3953e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 3954fa9e4066Sahrens } 3955fa9e4066Sahrens 3956e05725b1Sbonwick static int 3957e14bb325SJeff Bonwick zio_checksum_verify(zio_t *zio) 3958fa9e4066Sahrens { 395922fe2c88SJonathan Adams zio_bad_cksum_t info; 3960e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 3961e14bb325SJeff Bonwick int error; 3962fa9e4066Sahrens 3963b24ab676SJeff Bonwick ASSERT(zio->io_vd != NULL); 3964b24ab676SJeff Bonwick 3965e14bb325SJeff Bonwick if (bp == NULL) { 3966e14bb325SJeff Bonwick /* 3967e14bb325SJeff Bonwick * This is zio_read_phys(). 3968e14bb325SJeff Bonwick * We're either verifying a label checksum, or nothing at all. 3969e14bb325SJeff Bonwick */ 3970e14bb325SJeff Bonwick if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) 3971e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 3972fa9e4066Sahrens 3973e14bb325SJeff Bonwick ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); 3974e14bb325SJeff Bonwick } 3975fa9e4066Sahrens 397622fe2c88SJonathan Adams if ((error = zio_checksum_error(zio, &info)) != 0) { 3977e14bb325SJeff Bonwick zio->io_error = error; 3978373dc1cfSMatthew Ahrens if (error == ECKSUM && 3979373dc1cfSMatthew Ahrens !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { 398022fe2c88SJonathan Adams zfs_ereport_start_checksum(zio->io_spa, 3981eb633035STom Caputi zio->io_vd, &zio->io_bookmark, zio, 3982eb633035STom Caputi zio->io_offset, zio->io_size, NULL, &info); 3983e14bb325SJeff Bonwick } 3984fa9e4066Sahrens } 3985fa9e4066Sahrens 3986e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 3987fa9e4066Sahrens } 3988fa9e4066Sahrens 3989fa9e4066Sahrens /* 3990fa9e4066Sahrens * Called by RAID-Z to ensure we don't compute the checksum twice. 3991fa9e4066Sahrens */ 3992fa9e4066Sahrens void 3993fa9e4066Sahrens zio_checksum_verified(zio_t *zio) 3994fa9e4066Sahrens { 3995b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 3996fa9e4066Sahrens } 3997fa9e4066Sahrens 3998fa9e4066Sahrens /* 3999e14bb325SJeff Bonwick * ========================================================================== 4000e14bb325SJeff Bonwick * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. 40015d7b4d43SMatthew Ahrens * An error of 0 indicates success. ENXIO indicates whole-device failure, 4002e14bb325SJeff Bonwick * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO 4003e14bb325SJeff Bonwick * indicate errors that are specific to one I/O, and most likely permanent. 4004e14bb325SJeff Bonwick * Any other error is presumed to be worse because we weren't expecting it. 4005e14bb325SJeff Bonwick * ========================================================================== 4006fa9e4066Sahrens */ 4007e14bb325SJeff Bonwick int 4008e14bb325SJeff Bonwick zio_worst_error(int e1, int e2) 4009fa9e4066Sahrens { 4010e14bb325SJeff Bonwick static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; 4011e14bb325SJeff Bonwick int r1, r2; 4012e14bb325SJeff Bonwick 4013e14bb325SJeff Bonwick for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) 4014e14bb325SJeff Bonwick if (e1 == zio_error_rank[r1]) 4015e14bb325SJeff Bonwick break; 4016e14bb325SJeff Bonwick 4017e14bb325SJeff Bonwick for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) 4018e14bb325SJeff Bonwick if (e2 == zio_error_rank[r2]) 4019e14bb325SJeff Bonwick break; 402044cd46caSbillm 4021e14bb325SJeff Bonwick return (r1 > r2 ? e1 : e2); 4022fa9e4066Sahrens } 4023fa9e4066Sahrens 4024fa9e4066Sahrens /* 4025fa9e4066Sahrens * ========================================================================== 4026e14bb325SJeff Bonwick * I/O completion 4027fa9e4066Sahrens * ========================================================================== 4028fa9e4066Sahrens */ 4029e14bb325SJeff Bonwick static int 4030e14bb325SJeff Bonwick zio_ready(zio_t *zio) 4031fa9e4066Sahrens { 4032e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 4033a3f829aeSBill Moore zio_t *pio, *pio_next; 40340f7643c7SGeorge Wilson zio_link_t *zl = NULL; 4035fa9e4066Sahrens 4036d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_GANG_BIT | ZIO_CHILD_DDT_BIT, 4037d6e1c446SGeorge Wilson ZIO_WAIT_READY)) { 4038f5383399SBill Moore return (ZIO_PIPELINE_STOP); 4039d6e1c446SGeorge Wilson } 4040fa9e4066Sahrens 4041f5383399SBill Moore if (zio->io_ready) { 4042e14bb325SJeff Bonwick ASSERT(IO_IS_ALLOCATING(zio)); 404380901aeaSGeorge Wilson ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp) || 404480901aeaSGeorge Wilson (zio->io_flags & ZIO_FLAG_NOPWRITE)); 4045e14bb325SJeff Bonwick ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); 4046fa9e4066Sahrens 4047e14bb325SJeff Bonwick zio->io_ready(zio); 4048e14bb325SJeff Bonwick } 4049fa9e4066Sahrens 4050e14bb325SJeff Bonwick if (bp != NULL && bp != &zio->io_bp_copy) 4051e14bb325SJeff Bonwick zio->io_bp_copy = *bp; 4052fa9e4066Sahrens 40530f7643c7SGeorge Wilson if (zio->io_error != 0) { 4054e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 4055fa9e4066Sahrens 40560f7643c7SGeorge Wilson if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING) { 40570f7643c7SGeorge Wilson ASSERT(IO_IS_ALLOCATING(zio)); 40580f7643c7SGeorge Wilson ASSERT(zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); 4059663207adSDon Brady ASSERT(zio->io_metaslab_class != NULL); 4060663207adSDon Brady 40610f7643c7SGeorge Wilson /* 40620f7643c7SGeorge Wilson * We were unable to allocate anything, unreserve and 40630f7643c7SGeorge Wilson * issue the next I/O to allocate. 40640f7643c7SGeorge Wilson */ 40650f7643c7SGeorge Wilson metaslab_class_throttle_unreserve( 4066663207adSDon Brady zio->io_metaslab_class, zio->io_prop.zp_copies, 4067663207adSDon Brady zio->io_allocator, zio); 4068f78cdc34SPaul Dagnelie zio_allocate_dispatch(zio->io_spa, zio->io_allocator); 40690f7643c7SGeorge Wilson } 40700f7643c7SGeorge Wilson } 40710f7643c7SGeorge Wilson 4072a3f829aeSBill Moore mutex_enter(&zio->io_lock); 4073a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = 1; 40740f7643c7SGeorge Wilson pio = zio_walk_parents(zio, &zl); 4075a3f829aeSBill Moore mutex_exit(&zio->io_lock); 4076a3f829aeSBill Moore 4077a3f829aeSBill Moore /* 4078a3f829aeSBill Moore * As we notify zio's parents, new parents could be added. 4079a3f829aeSBill Moore * New parents go to the head of zio's io_parent_list, however, 4080a3f829aeSBill Moore * so we will (correctly) not notify them. The remainder of zio's 4081a3f829aeSBill Moore * io_parent_list, from 'pio_next' onward, cannot change because 4082a3f829aeSBill Moore * all parents must wait for us to be done before they can be done. 4083a3f829aeSBill Moore */ 4084a3f829aeSBill Moore for (; pio != NULL; pio = pio_next) { 40850f7643c7SGeorge Wilson pio_next = zio_walk_parents(zio, &zl); 4086e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_READY); 4087a3f829aeSBill Moore } 4088fa9e4066Sahrens 4089b24ab676SJeff Bonwick if (zio->io_flags & ZIO_FLAG_NODATA) { 4090b24ab676SJeff Bonwick if (BP_IS_GANG(bp)) { 4091b24ab676SJeff Bonwick zio->io_flags &= ~ZIO_FLAG_NODATA; 4092b24ab676SJeff Bonwick } else { 4093770499e1SDan Kimmel ASSERT((uintptr_t)zio->io_abd < SPA_MAXBLOCKSIZE); 4094b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 4095b24ab676SJeff Bonwick } 4096b24ab676SJeff Bonwick } 4097b24ab676SJeff Bonwick 4098a33cae98STim Haley if (zio_injection_enabled && 4099a33cae98STim Haley zio->io_spa->spa_syncing_txg == zio->io_txg) 4100a33cae98STim Haley zio_handle_ignored_writes(zio); 4101a33cae98STim Haley 4102e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 4103fa9e4066Sahrens } 4104fa9e4066Sahrens 41050f7643c7SGeorge Wilson /* 41060f7643c7SGeorge Wilson * Update the allocation throttle accounting. 41070f7643c7SGeorge Wilson */ 41080f7643c7SGeorge Wilson static void 41090f7643c7SGeorge Wilson zio_dva_throttle_done(zio_t *zio) 41100f7643c7SGeorge Wilson { 41110f7643c7SGeorge Wilson zio_t *lio = zio->io_logical; 41120f7643c7SGeorge Wilson zio_t *pio = zio_unique_parent(zio); 41130f7643c7SGeorge Wilson vdev_t *vd = zio->io_vd; 41140f7643c7SGeorge Wilson int flags = METASLAB_ASYNC_ALLOC; 41150f7643c7SGeorge Wilson 41160f7643c7SGeorge Wilson ASSERT3P(zio->io_bp, !=, NULL); 41170f7643c7SGeorge Wilson ASSERT3U(zio->io_type, ==, ZIO_TYPE_WRITE); 41180f7643c7SGeorge Wilson ASSERT3U(zio->io_priority, ==, ZIO_PRIORITY_ASYNC_WRITE); 41190f7643c7SGeorge Wilson ASSERT3U(zio->io_child_type, ==, ZIO_CHILD_VDEV); 41200f7643c7SGeorge Wilson ASSERT(vd != NULL); 41210f7643c7SGeorge Wilson ASSERT3P(vd, ==, vd->vdev_top); 41220f7643c7SGeorge Wilson ASSERT(!(zio->io_flags & (ZIO_FLAG_IO_REPAIR | ZIO_FLAG_IO_RETRY))); 41230f7643c7SGeorge Wilson ASSERT(zio->io_flags & ZIO_FLAG_IO_ALLOCATING); 41240f7643c7SGeorge Wilson ASSERT(!(lio->io_flags & ZIO_FLAG_IO_REWRITE)); 41250f7643c7SGeorge Wilson ASSERT(!(lio->io_orig_flags & ZIO_FLAG_NODATA)); 41260f7643c7SGeorge Wilson 41270f7643c7SGeorge Wilson /* 41280f7643c7SGeorge Wilson * Parents of gang children can have two flavors -- ones that 41290f7643c7SGeorge Wilson * allocated the gang header (will have ZIO_FLAG_IO_REWRITE set) 41300f7643c7SGeorge Wilson * and ones that allocated the constituent blocks. The allocation 41310f7643c7SGeorge Wilson * throttle needs to know the allocating parent zio so we must find 41320f7643c7SGeorge Wilson * it here. 41330f7643c7SGeorge Wilson */ 41340f7643c7SGeorge Wilson if (pio->io_child_type == ZIO_CHILD_GANG) { 41350f7643c7SGeorge Wilson /* 41360f7643c7SGeorge Wilson * If our parent is a rewrite gang child then our grandparent 41370f7643c7SGeorge Wilson * would have been the one that performed the allocation. 41380f7643c7SGeorge Wilson */ 41390f7643c7SGeorge Wilson if (pio->io_flags & ZIO_FLAG_IO_REWRITE) 41400f7643c7SGeorge Wilson pio = zio_unique_parent(pio); 41410f7643c7SGeorge Wilson flags |= METASLAB_GANG_CHILD; 41420f7643c7SGeorge Wilson } 41430f7643c7SGeorge Wilson 41440f7643c7SGeorge Wilson ASSERT(IO_IS_ALLOCATING(pio)); 41450f7643c7SGeorge Wilson ASSERT3P(zio, !=, zio->io_logical); 41460f7643c7SGeorge Wilson ASSERT(zio->io_logical != NULL); 41470f7643c7SGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REPAIR)); 41480f7643c7SGeorge Wilson ASSERT0(zio->io_flags & ZIO_FLAG_NOPWRITE); 4149663207adSDon Brady ASSERT(zio->io_metaslab_class != NULL); 41500f7643c7SGeorge Wilson 41510f7643c7SGeorge Wilson mutex_enter(&pio->io_lock); 4152f78cdc34SPaul Dagnelie metaslab_group_alloc_decrement(zio->io_spa, vd->vdev_id, pio, flags, 4153f78cdc34SPaul Dagnelie pio->io_allocator, B_TRUE); 41540f7643c7SGeorge Wilson mutex_exit(&pio->io_lock); 41550f7643c7SGeorge Wilson 4156663207adSDon Brady metaslab_class_throttle_unreserve(zio->io_metaslab_class, 1, 4157663207adSDon Brady pio->io_allocator, pio); 41580f7643c7SGeorge Wilson 41590f7643c7SGeorge Wilson /* 41600f7643c7SGeorge Wilson * Call into the pipeline to see if there is more work that 41610f7643c7SGeorge Wilson * needs to be done. If there is work to be done it will be 41620f7643c7SGeorge Wilson * dispatched to another taskq thread. 41630f7643c7SGeorge Wilson */ 4164f78cdc34SPaul Dagnelie zio_allocate_dispatch(zio->io_spa, pio->io_allocator); 41650f7643c7SGeorge Wilson } 41660f7643c7SGeorge Wilson 4167e14bb325SJeff Bonwick static int 4168e14bb325SJeff Bonwick zio_done(zio_t *zio) 4169d63d470bSgw { 4170e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 4171e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 4172e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 4173e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 4174e14bb325SJeff Bonwick uint64_t psize = zio->io_size; 4175a3f829aeSBill Moore zio_t *pio, *pio_next; 41760f7643c7SGeorge Wilson zio_link_t *zl = NULL; 4177d63d470bSgw 4178e14bb325SJeff Bonwick /* 4179f5383399SBill Moore * If our children haven't all completed, 4180e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 4181e14bb325SJeff Bonwick */ 4182d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_ALL_BITS, ZIO_WAIT_DONE)) { 4183e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 4184d6e1c446SGeorge Wilson } 4185d63d470bSgw 41860f7643c7SGeorge Wilson /* 41870f7643c7SGeorge Wilson * If the allocation throttle is enabled, then update the accounting. 41880f7643c7SGeorge Wilson * We only track child I/Os that are part of an allocating async 41890f7643c7SGeorge Wilson * write. We must do this since the allocation is performed 41900f7643c7SGeorge Wilson * by the logical I/O but the actual write is done by child I/Os. 41910f7643c7SGeorge Wilson */ 41920f7643c7SGeorge Wilson if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING && 41930f7643c7SGeorge Wilson zio->io_child_type == ZIO_CHILD_VDEV) { 4194663207adSDon Brady ASSERT(zio->io_metaslab_class != NULL); 4195663207adSDon Brady ASSERT(zio->io_metaslab_class->mc_alloc_throttle_enabled); 41960f7643c7SGeorge Wilson zio_dva_throttle_done(zio); 41970f7643c7SGeorge Wilson } 41980f7643c7SGeorge Wilson 41990f7643c7SGeorge Wilson /* 42000f7643c7SGeorge Wilson * If the allocation throttle is enabled, verify that 42010f7643c7SGeorge Wilson * we have decremented the refcounts for every I/O that was throttled. 42020f7643c7SGeorge Wilson */ 42030f7643c7SGeorge Wilson if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING) { 42040f7643c7SGeorge Wilson ASSERT(zio->io_type == ZIO_TYPE_WRITE); 42050f7643c7SGeorge Wilson ASSERT(zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); 42060f7643c7SGeorge Wilson ASSERT(bp != NULL); 4207663207adSDon Brady 4208f78cdc34SPaul Dagnelie metaslab_group_alloc_verify(spa, zio->io_bp, zio, 4209f78cdc34SPaul Dagnelie zio->io_allocator); 4210e914ace2STim Schumacher VERIFY(zfs_refcount_not_held( 4211663207adSDon Brady &zio->io_metaslab_class->mc_alloc_slots[zio->io_allocator], 4212663207adSDon Brady zio)); 42130f7643c7SGeorge Wilson } 42140f7643c7SGeorge Wilson 4215e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 4216e14bb325SJeff Bonwick for (int w = 0; w < ZIO_WAIT_TYPES; w++) 4217e14bb325SJeff Bonwick ASSERT(zio->io_children[c][w] == 0); 4218e14bb325SJeff Bonwick 42195d7b4d43SMatthew Ahrens if (bp != NULL && !BP_IS_EMBEDDED(bp)) { 4220e14bb325SJeff Bonwick ASSERT(bp->blk_pad[0] == 0); 4221e14bb325SJeff Bonwick ASSERT(bp->blk_pad[1] == 0); 4222e14bb325SJeff Bonwick ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || 4223a3f829aeSBill Moore (bp == zio_unique_parent(zio)->io_bp)); 4224e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && 4225b24ab676SJeff Bonwick zio->io_bp_override == NULL && 4226e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { 4227b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(bp)); 4228e14bb325SJeff Bonwick ASSERT(BP_COUNT_GANG(bp) == 0 || 4229e14bb325SJeff Bonwick (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); 4230e14bb325SJeff Bonwick } 423180901aeaSGeorge Wilson if (zio->io_flags & ZIO_FLAG_NOPWRITE) 423280901aeaSGeorge Wilson VERIFY(BP_EQUAL(bp, &zio->io_bp_orig)); 4233e14bb325SJeff Bonwick } 4234fa9e4066Sahrens 4235e14bb325SJeff Bonwick /* 4236b24ab676SJeff Bonwick * If there were child vdev/gang/ddt errors, they apply to us now. 4237e14bb325SJeff Bonwick */ 4238e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); 4239e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_GANG); 4240b24ab676SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_DDT); 4241b24ab676SJeff Bonwick 4242b24ab676SJeff Bonwick /* 4243b24ab676SJeff Bonwick * If the I/O on the transformed data was successful, generate any 4244b24ab676SJeff Bonwick * checksum reports now while we still have the transformed data. 4245b24ab676SJeff Bonwick */ 4246b24ab676SJeff Bonwick if (zio->io_error == 0) { 4247b24ab676SJeff Bonwick while (zio->io_cksum_report != NULL) { 4248b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 4249b24ab676SJeff Bonwick uint64_t align = zcr->zcr_align; 4250b24ab676SJeff Bonwick uint64_t asize = P2ROUNDUP(psize, align); 4251770499e1SDan Kimmel abd_t *adata = zio->io_abd; 4252b24ab676SJeff Bonwick 4253b24ab676SJeff Bonwick if (asize != psize) { 4254eb633035STom Caputi adata = abd_alloc(asize, B_TRUE); 4255770499e1SDan Kimmel abd_copy(adata, zio->io_abd, psize); 4256770499e1SDan Kimmel abd_zero_off(adata, psize, asize - psize); 4257b24ab676SJeff Bonwick } 4258b24ab676SJeff Bonwick 4259b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 4260b24ab676SJeff Bonwick zcr->zcr_next = NULL; 4261eb633035STom Caputi zcr->zcr_finish(zcr, adata); 4262b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 4263b24ab676SJeff Bonwick 4264b24ab676SJeff Bonwick if (asize != psize) 4265770499e1SDan Kimmel abd_free(adata); 4266b24ab676SJeff Bonwick } 4267b24ab676SJeff Bonwick } 4268e14bb325SJeff Bonwick 4269e14bb325SJeff Bonwick zio_pop_transforms(zio); /* note: may set zio->io_error */ 4270e14bb325SJeff Bonwick 4271e14bb325SJeff Bonwick vdev_stat_update(zio, psize); 4272e14bb325SJeff Bonwick 4273dd50e0ccSTony Hutter if (zio->io_delay >= MSEC2NSEC(zio_slow_io_ms)) { 4274dd50e0ccSTony Hutter if (zio->io_vd != NULL && !vdev_is_dead(zio->io_vd)) { 4275dd50e0ccSTony Hutter /* 4276dd50e0ccSTony Hutter * We want to only increment our slow IO counters if 4277dd50e0ccSTony Hutter * the IO is valid (i.e. not if the drive is removed). 4278dd50e0ccSTony Hutter * 4279dd50e0ccSTony Hutter * zfs_ereport_post() will also do these checks, but 4280dd50e0ccSTony Hutter * it can also have other failures, so we need to 4281dd50e0ccSTony Hutter * increment the slow_io counters independent of it. 4282dd50e0ccSTony Hutter */ 4283dd50e0ccSTony Hutter if (zfs_ereport_is_valid(FM_EREPORT_ZFS_DELAY, 4284dd50e0ccSTony Hutter zio->io_spa, zio->io_vd, zio)) { 4285dd50e0ccSTony Hutter mutex_enter(&zio->io_vd->vdev_stat_lock); 4286dd50e0ccSTony Hutter zio->io_vd->vdev_stat.vs_slow_ios++; 4287dd50e0ccSTony Hutter mutex_exit(&zio->io_vd->vdev_stat_lock); 4288dd50e0ccSTony Hutter 42899b088140SToomas Soome (void) zfs_ereport_post(FM_EREPORT_ZFS_DELAY, 4290dd50e0ccSTony Hutter zio->io_spa, zio->io_vd, &zio->io_bookmark, 4291dd50e0ccSTony Hutter zio, 0, 0); 4292dd50e0ccSTony Hutter } 4293dd50e0ccSTony Hutter } 4294dd50e0ccSTony Hutter } 4295dd50e0ccSTony Hutter 4296e14bb325SJeff Bonwick if (zio->io_error) { 4297e14bb325SJeff Bonwick /* 4298e14bb325SJeff Bonwick * If this I/O is attached to a particular vdev, 4299e14bb325SJeff Bonwick * generate an error message describing the I/O failure 4300e14bb325SJeff Bonwick * at the block level. We ignore these errors if the 4301e14bb325SJeff Bonwick * device is currently unavailable. 4302e14bb325SJeff Bonwick */ 4303e14bb325SJeff Bonwick if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) 43049b088140SToomas Soome (void) zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, 4305eb633035STom Caputi &zio->io_bookmark, zio, 0, 0); 4306e14bb325SJeff Bonwick 43078f18d1faSGeorge Wilson if ((zio->io_error == EIO || !(zio->io_flags & 43088f18d1faSGeorge Wilson (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && 43098f18d1faSGeorge Wilson zio == lio) { 4310e14bb325SJeff Bonwick /* 4311e14bb325SJeff Bonwick * For logical I/O requests, tell the SPA to log the 4312e14bb325SJeff Bonwick * error and generate a logical data ereport. 4313e14bb325SJeff Bonwick */ 4314eb633035STom Caputi spa_log_error(spa, &zio->io_bookmark); 43159b088140SToomas Soome (void) zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, 4316eb633035STom Caputi &zio->io_bookmark, zio, 0, 0); 4317e14bb325SJeff Bonwick } 4318e14bb325SJeff Bonwick } 4319fa9e4066Sahrens 4320e14bb325SJeff Bonwick if (zio->io_error && zio == lio) { 4321e14bb325SJeff Bonwick /* 4322e14bb325SJeff Bonwick * Determine whether zio should be reexecuted. This will 4323e14bb325SJeff Bonwick * propagate all the way to the root via zio_notify_parent(). 4324e14bb325SJeff Bonwick */ 4325e14bb325SJeff Bonwick ASSERT(vd == NULL && bp != NULL); 4326b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 4327e14bb325SJeff Bonwick 4328b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(zio) && 4329b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_CANFAIL)) { 4330e14bb325SJeff Bonwick if (zio->io_error != ENOSPC) 4331e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_NOW; 4332e14bb325SJeff Bonwick else 4333e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 4334b24ab676SJeff Bonwick } 4335e14bb325SJeff Bonwick 4336e14bb325SJeff Bonwick if ((zio->io_type == ZIO_TYPE_READ || 4337e14bb325SJeff Bonwick zio->io_type == ZIO_TYPE_FREE) && 433844ecc532SGeorge Wilson !(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && 4339e14bb325SJeff Bonwick zio->io_error == ENXIO && 4340b16da2e2SGeorge Wilson spa_load_state(spa) == SPA_LOAD_NONE && 4341e14bb325SJeff Bonwick spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) 4342e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 4343e14bb325SJeff Bonwick 4344e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) 4345e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 434622fe2c88SJonathan Adams 434722fe2c88SJonathan Adams /* 434822fe2c88SJonathan Adams * Here is a possibly good place to attempt to do 434922fe2c88SJonathan Adams * either combinatorial reconstruction or error correction 435022fe2c88SJonathan Adams * based on checksums. It also might be a good place 435122fe2c88SJonathan Adams * to send out preliminary ereports before we suspend 435222fe2c88SJonathan Adams * processing. 435322fe2c88SJonathan Adams */ 4354d63d470bSgw } 4355d63d470bSgw 435667bd71c6Sperrin /* 4357e14bb325SJeff Bonwick * If there were logical child errors, they apply to us now. 4358e14bb325SJeff Bonwick * We defer this until now to avoid conflating logical child 4359e14bb325SJeff Bonwick * errors with errors that happened to the zio itself when 4360e14bb325SJeff Bonwick * updating vdev stats and reporting FMA events above. 436167bd71c6Sperrin */ 4362e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); 43638654d025Sperrin 4364b24ab676SJeff Bonwick if ((zio->io_error || zio->io_reexecute) && 4365b24ab676SJeff Bonwick IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && 436680901aeaSGeorge Wilson !(zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE))) 4367f5383399SBill Moore zio_dva_unallocate(zio, zio->io_gang_tree, bp); 4368f5383399SBill Moore 4369f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 4370f5383399SBill Moore 437133a372edSGeorge Wilson /* 437233a372edSGeorge Wilson * Godfather I/Os should never suspend. 437333a372edSGeorge Wilson */ 437433a372edSGeorge Wilson if ((zio->io_flags & ZIO_FLAG_GODFATHER) && 437533a372edSGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) 437633a372edSGeorge Wilson zio->io_reexecute = 0; 437733a372edSGeorge Wilson 437833a372edSGeorge Wilson if (zio->io_reexecute) { 4379e14bb325SJeff Bonwick /* 4380e14bb325SJeff Bonwick * This is a logical I/O that wants to reexecute. 4381e14bb325SJeff Bonwick * 4382e14bb325SJeff Bonwick * Reexecute is top-down. When an i/o fails, if it's not 4383e14bb325SJeff Bonwick * the root, it simply notifies its parent and sticks around. 4384e14bb325SJeff Bonwick * The parent, seeing that it still has children in zio_done(), 4385e14bb325SJeff Bonwick * does the same. This percolates all the way up to the root. 4386e14bb325SJeff Bonwick * The root i/o will reexecute or suspend the entire tree. 4387e14bb325SJeff Bonwick * 4388e14bb325SJeff Bonwick * This approach ensures that zio_reexecute() honors 4389e14bb325SJeff Bonwick * all the original i/o dependency relationships, e.g. 4390e14bb325SJeff Bonwick * parents not executing until children are ready. 4391e14bb325SJeff Bonwick */ 4392e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 4393fa9e4066Sahrens 4394f5383399SBill Moore zio->io_gang_leader = NULL; 4395e14bb325SJeff Bonwick 4396a3f829aeSBill Moore mutex_enter(&zio->io_lock); 4397a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 4398a3f829aeSBill Moore mutex_exit(&zio->io_lock); 4399a3f829aeSBill Moore 440054d692b7SGeorge Wilson /* 440154d692b7SGeorge Wilson * "The Godfather" I/O monitors its children but is 440254d692b7SGeorge Wilson * not a true parent to them. It will track them through 440354d692b7SGeorge Wilson * the pipeline but severs its ties whenever they get into 440454d692b7SGeorge Wilson * trouble (e.g. suspended). This allows "The Godfather" 440554d692b7SGeorge Wilson * I/O to return status without blocking. 440654d692b7SGeorge Wilson */ 44070f7643c7SGeorge Wilson zl = NULL; 44080f7643c7SGeorge Wilson for (pio = zio_walk_parents(zio, &zl); pio != NULL; 44090f7643c7SGeorge Wilson pio = pio_next) { 44100f7643c7SGeorge Wilson zio_link_t *remove_zl = zl; 44110f7643c7SGeorge Wilson pio_next = zio_walk_parents(zio, &zl); 441254d692b7SGeorge Wilson 441354d692b7SGeorge Wilson if ((pio->io_flags & ZIO_FLAG_GODFATHER) && 441454d692b7SGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { 44150f7643c7SGeorge Wilson zio_remove_child(pio, zio, remove_zl); 441654d692b7SGeorge Wilson zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 441754d692b7SGeorge Wilson } 441854d692b7SGeorge Wilson } 441954d692b7SGeorge Wilson 4420a3f829aeSBill Moore if ((pio = zio_unique_parent(zio)) != NULL) { 4421e14bb325SJeff Bonwick /* 4422e14bb325SJeff Bonwick * We're not a root i/o, so there's nothing to do 4423e14bb325SJeff Bonwick * but notify our parent. Don't propagate errors 4424e14bb325SJeff Bonwick * upward since we haven't permanently failed yet. 4425e14bb325SJeff Bonwick */ 442633a372edSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 4427e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; 4428e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 4429e14bb325SJeff Bonwick } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { 4430e14bb325SJeff Bonwick /* 4431e14bb325SJeff Bonwick * We'd fail again if we reexecuted now, so suspend 4432e14bb325SJeff Bonwick * until conditions improve (e.g. device comes online). 4433e14bb325SJeff Bonwick */ 4434e0f1c0afSOlaf Faaland zio_suspend(zio->io_spa, zio, ZIO_SUSPEND_IOERR); 4435e14bb325SJeff Bonwick } else { 4436e14bb325SJeff Bonwick /* 4437e14bb325SJeff Bonwick * Reexecution is potentially a huge amount of work. 4438e14bb325SJeff Bonwick * Hand it off to the otherwise-unused claim taskq. 4439e14bb325SJeff Bonwick */ 44405aeb9474SGarrett D'Amore ASSERT(zio->io_tqent.tqent_next == NULL); 4441ec94d322SAdam Leventhal spa_taskq_dispatch_ent(spa, ZIO_TYPE_CLAIM, 4442ec94d322SAdam Leventhal ZIO_TASKQ_ISSUE, (task_func_t *)zio_reexecute, zio, 4443ec94d322SAdam Leventhal 0, &zio->io_tqent); 4444e14bb325SJeff Bonwick } 4445e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 4446fa9e4066Sahrens } 4447fa9e4066Sahrens 4448b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 444933a372edSGeorge Wilson ASSERT(zio->io_reexecute == 0); 4450e14bb325SJeff Bonwick ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); 4451fa9e4066Sahrens 4452b24ab676SJeff Bonwick /* 4453b24ab676SJeff Bonwick * Report any checksum errors, since the I/O is complete. 4454b24ab676SJeff Bonwick */ 445522fe2c88SJonathan Adams while (zio->io_cksum_report != NULL) { 4456b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 4457b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 4458b24ab676SJeff Bonwick zcr->zcr_next = NULL; 4459b24ab676SJeff Bonwick zcr->zcr_finish(zcr, NULL); 4460b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 446122fe2c88SJonathan Adams } 446222fe2c88SJonathan Adams 4463a3f829aeSBill Moore /* 4464a3f829aeSBill Moore * It is the responsibility of the done callback to ensure that this 4465a3f829aeSBill Moore * particular zio is no longer discoverable for adoption, and as 4466a3f829aeSBill Moore * such, cannot acquire any new parents. 4467a3f829aeSBill Moore */ 4468e14bb325SJeff Bonwick if (zio->io_done) 4469e14bb325SJeff Bonwick zio->io_done(zio); 4470fa9e4066Sahrens 4471a3f829aeSBill Moore mutex_enter(&zio->io_lock); 4472a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 4473a3f829aeSBill Moore mutex_exit(&zio->io_lock); 4474fa9e4066Sahrens 44750f7643c7SGeorge Wilson zl = NULL; 44760f7643c7SGeorge Wilson for (pio = zio_walk_parents(zio, &zl); pio != NULL; pio = pio_next) { 44770f7643c7SGeorge Wilson zio_link_t *remove_zl = zl; 44780f7643c7SGeorge Wilson pio_next = zio_walk_parents(zio, &zl); 44790f7643c7SGeorge Wilson zio_remove_child(pio, zio, remove_zl); 4480e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 4481e14bb325SJeff Bonwick } 4482fa9e4066Sahrens 4483e14bb325SJeff Bonwick if (zio->io_waiter != NULL) { 4484e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 4485e14bb325SJeff Bonwick zio->io_executor = NULL; 4486e14bb325SJeff Bonwick cv_broadcast(&zio->io_cv); 4487e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 4488e14bb325SJeff Bonwick } else { 4489e14bb325SJeff Bonwick zio_destroy(zio); 4490e14bb325SJeff Bonwick } 4491fa9e4066Sahrens 4492e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 4493fa9e4066Sahrens } 449446341222Sperrin 449546341222Sperrin /* 4496e14bb325SJeff Bonwick * ========================================================================== 4497e14bb325SJeff Bonwick * I/O pipeline definition 4498e14bb325SJeff Bonwick * ========================================================================== 449946341222Sperrin */ 4500b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[] = { 4501e14bb325SJeff Bonwick NULL, 4502e14bb325SJeff Bonwick zio_read_bp_init, 45030f7643c7SGeorge Wilson zio_write_bp_init, 4504b24ab676SJeff Bonwick zio_free_bp_init, 4505b24ab676SJeff Bonwick zio_issue_async, 45060f7643c7SGeorge Wilson zio_write_compress, 4507eb633035STom Caputi zio_encrypt, 4508e14bb325SJeff Bonwick zio_checksum_generate, 450980901aeaSGeorge Wilson zio_nop_write, 4510b24ab676SJeff Bonwick zio_ddt_read_start, 4511b24ab676SJeff Bonwick zio_ddt_read_done, 4512b24ab676SJeff Bonwick zio_ddt_write, 4513b24ab676SJeff Bonwick zio_ddt_free, 4514e14bb325SJeff Bonwick zio_gang_assemble, 4515e14bb325SJeff Bonwick zio_gang_issue, 45160f7643c7SGeorge Wilson zio_dva_throttle, 4517e14bb325SJeff Bonwick zio_dva_allocate, 4518e14bb325SJeff Bonwick zio_dva_free, 4519e14bb325SJeff Bonwick zio_dva_claim, 4520e14bb325SJeff Bonwick zio_ready, 4521e14bb325SJeff Bonwick zio_vdev_io_start, 4522e14bb325SJeff Bonwick zio_vdev_io_done, 4523e14bb325SJeff Bonwick zio_vdev_io_assess, 4524e14bb325SJeff Bonwick zio_checksum_verify, 4525e14bb325SJeff Bonwick zio_done 4526e14bb325SJeff Bonwick }; 4527ad135b5dSChristopher Siden 4528ad135b5dSChristopher Siden 4529ad135b5dSChristopher Siden 4530ad135b5dSChristopher Siden 4531a2cdcdd2SPaul Dagnelie /* 4532a2cdcdd2SPaul Dagnelie * Compare two zbookmark_phys_t's to see which we would reach first in a 4533a2cdcdd2SPaul Dagnelie * pre-order traversal of the object tree. 4534a2cdcdd2SPaul Dagnelie * 4535a2cdcdd2SPaul Dagnelie * This is simple in every case aside from the meta-dnode object. For all other 4536a2cdcdd2SPaul Dagnelie * objects, we traverse them in order (object 1 before object 2, and so on). 4537a2cdcdd2SPaul Dagnelie * However, all of these objects are traversed while traversing object 0, since 4538a2cdcdd2SPaul Dagnelie * the data it points to is the list of objects. Thus, we need to convert to a 4539a2cdcdd2SPaul Dagnelie * canonical representation so we can compare meta-dnode bookmarks to 4540a2cdcdd2SPaul Dagnelie * non-meta-dnode bookmarks. 4541a2cdcdd2SPaul Dagnelie * 4542a2cdcdd2SPaul Dagnelie * We do this by calculating "equivalents" for each field of the zbookmark. 4543a2cdcdd2SPaul Dagnelie * zbookmarks outside of the meta-dnode use their own object and level, and 4544a2cdcdd2SPaul Dagnelie * calculate the level 0 equivalent (the first L0 blkid that is contained in the 4545a2cdcdd2SPaul Dagnelie * blocks this bookmark refers to) by multiplying their blkid by their span 4546a2cdcdd2SPaul Dagnelie * (the number of L0 blocks contained within one block at their level). 4547a2cdcdd2SPaul Dagnelie * zbookmarks inside the meta-dnode calculate their object equivalent 4548a2cdcdd2SPaul Dagnelie * (which is L0equiv * dnodes per data block), use 0 for their L0equiv, and use 4549a2cdcdd2SPaul Dagnelie * level + 1<<31 (any value larger than a level could ever be) for their level. 4550a2cdcdd2SPaul Dagnelie * This causes them to always compare before a bookmark in their object 4551a2cdcdd2SPaul Dagnelie * equivalent, compare appropriately to bookmarks in other objects, and to 4552a2cdcdd2SPaul Dagnelie * compare appropriately to other bookmarks in the meta-dnode. 4553a2cdcdd2SPaul Dagnelie */ 4554a2cdcdd2SPaul Dagnelie int 4555a2cdcdd2SPaul Dagnelie zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, uint8_t ibs2, 4556a2cdcdd2SPaul Dagnelie const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2) 4557a2cdcdd2SPaul Dagnelie { 4558a2cdcdd2SPaul Dagnelie /* 4559a2cdcdd2SPaul Dagnelie * These variables represent the "equivalent" values for the zbookmark, 4560a2cdcdd2SPaul Dagnelie * after converting zbookmarks inside the meta dnode to their 4561a2cdcdd2SPaul Dagnelie * normal-object equivalents. 4562a2cdcdd2SPaul Dagnelie */ 4563a2cdcdd2SPaul Dagnelie uint64_t zb1obj, zb2obj; 4564a2cdcdd2SPaul Dagnelie uint64_t zb1L0, zb2L0; 4565a2cdcdd2SPaul Dagnelie uint64_t zb1level, zb2level; 4566ad135b5dSChristopher Siden 4567a2cdcdd2SPaul Dagnelie if (zb1->zb_object == zb2->zb_object && 4568a2cdcdd2SPaul Dagnelie zb1->zb_level == zb2->zb_level && 4569a2cdcdd2SPaul Dagnelie zb1->zb_blkid == zb2->zb_blkid) 4570a2cdcdd2SPaul Dagnelie return (0); 4571a2cdcdd2SPaul Dagnelie 4572a2cdcdd2SPaul Dagnelie /* 4573a2cdcdd2SPaul Dagnelie * BP_SPANB calculates the span in blocks. 4574a2cdcdd2SPaul Dagnelie */ 4575a2cdcdd2SPaul Dagnelie zb1L0 = (zb1->zb_blkid) * BP_SPANB(ibs1, zb1->zb_level); 4576a2cdcdd2SPaul Dagnelie zb2L0 = (zb2->zb_blkid) * BP_SPANB(ibs2, zb2->zb_level); 4577ad135b5dSChristopher Siden 4578ad135b5dSChristopher Siden if (zb1->zb_object == DMU_META_DNODE_OBJECT) { 4579a2cdcdd2SPaul Dagnelie zb1obj = zb1L0 * (dbss1 << (SPA_MINBLOCKSHIFT - DNODE_SHIFT)); 4580a2cdcdd2SPaul Dagnelie zb1L0 = 0; 4581a2cdcdd2SPaul Dagnelie zb1level = zb1->zb_level + COMPARE_META_LEVEL; 4582a2cdcdd2SPaul Dagnelie } else { 4583a2cdcdd2SPaul Dagnelie zb1obj = zb1->zb_object; 4584a2cdcdd2SPaul Dagnelie zb1level = zb1->zb_level; 4585ad135b5dSChristopher Siden } 4586ad135b5dSChristopher Siden 4587a2cdcdd2SPaul Dagnelie if (zb2->zb_object == DMU_META_DNODE_OBJECT) { 4588a2cdcdd2SPaul Dagnelie zb2obj = zb2L0 * (dbss2 << (SPA_MINBLOCKSHIFT - DNODE_SHIFT)); 4589a2cdcdd2SPaul Dagnelie zb2L0 = 0; 4590a2cdcdd2SPaul Dagnelie zb2level = zb2->zb_level + COMPARE_META_LEVEL; 4591a2cdcdd2SPaul Dagnelie } else { 4592a2cdcdd2SPaul Dagnelie zb2obj = zb2->zb_object; 4593a2cdcdd2SPaul Dagnelie zb2level = zb2->zb_level; 4594a2cdcdd2SPaul Dagnelie } 4595a2cdcdd2SPaul Dagnelie 4596a2cdcdd2SPaul Dagnelie /* Now that we have a canonical representation, do the comparison. */ 4597a2cdcdd2SPaul Dagnelie if (zb1obj != zb2obj) 4598a2cdcdd2SPaul Dagnelie return (zb1obj < zb2obj ? -1 : 1); 4599a2cdcdd2SPaul Dagnelie else if (zb1L0 != zb2L0) 4600a2cdcdd2SPaul Dagnelie return (zb1L0 < zb2L0 ? -1 : 1); 4601a2cdcdd2SPaul Dagnelie else if (zb1level != zb2level) 4602a2cdcdd2SPaul Dagnelie return (zb1level > zb2level ? -1 : 1); 4603a2cdcdd2SPaul Dagnelie /* 4604a2cdcdd2SPaul Dagnelie * This can (theoretically) happen if the bookmarks have the same object 4605a2cdcdd2SPaul Dagnelie * and level, but different blkids, if the block sizes are not the same. 4606a2cdcdd2SPaul Dagnelie * There is presently no way to change the indirect block sizes 4607a2cdcdd2SPaul Dagnelie */ 4608a2cdcdd2SPaul Dagnelie return (0); 4609a2cdcdd2SPaul Dagnelie } 4610a2cdcdd2SPaul Dagnelie 4611a2cdcdd2SPaul Dagnelie /* 4612a2cdcdd2SPaul Dagnelie * This function checks the following: given that last_block is the place that 4613a2cdcdd2SPaul Dagnelie * our traversal stopped last time, does that guarantee that we've visited 4614a2cdcdd2SPaul Dagnelie * every node under subtree_root? Therefore, we can't just use the raw output 4615a2cdcdd2SPaul Dagnelie * of zbookmark_compare. We have to pass in a modified version of 4616a2cdcdd2SPaul Dagnelie * subtree_root; by incrementing the block id, and then checking whether 4617a2cdcdd2SPaul Dagnelie * last_block is before or equal to that, we can tell whether or not having 4618a2cdcdd2SPaul Dagnelie * visited last_block implies that all of subtree_root's children have been 4619a2cdcdd2SPaul Dagnelie * visited. 4620a2cdcdd2SPaul Dagnelie */ 4621a2cdcdd2SPaul Dagnelie boolean_t 4622a2cdcdd2SPaul Dagnelie zbookmark_subtree_completed(const dnode_phys_t *dnp, 4623a2cdcdd2SPaul Dagnelie const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block) 4624a2cdcdd2SPaul Dagnelie { 4625a2cdcdd2SPaul Dagnelie zbookmark_phys_t mod_zb = *subtree_root; 4626a2cdcdd2SPaul Dagnelie mod_zb.zb_blkid++; 4627a2cdcdd2SPaul Dagnelie ASSERT(last_block->zb_level == 0); 4628a2cdcdd2SPaul Dagnelie 4629a2cdcdd2SPaul Dagnelie /* The objset_phys_t isn't before anything. */ 4630a2cdcdd2SPaul Dagnelie if (dnp == NULL) 4631ad135b5dSChristopher Siden return (B_FALSE); 4632a2cdcdd2SPaul Dagnelie 4633a2cdcdd2SPaul Dagnelie /* 4634a2cdcdd2SPaul Dagnelie * We pass in 1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT) for the 4635a2cdcdd2SPaul Dagnelie * data block size in sectors, because that variable is only used if 4636a2cdcdd2SPaul Dagnelie * the bookmark refers to a block in the meta-dnode. Since we don't 4637a2cdcdd2SPaul Dagnelie * know without examining it what object it refers to, and there's no 4638a2cdcdd2SPaul Dagnelie * harm in passing in this value in other cases, we always pass it in. 4639a2cdcdd2SPaul Dagnelie * 4640a2cdcdd2SPaul Dagnelie * We pass in 0 for the indirect block size shift because zb2 must be 4641a2cdcdd2SPaul Dagnelie * level 0. The indirect block size is only used to calculate the span 4642a2cdcdd2SPaul Dagnelie * of the bookmark, but since the bookmark must be level 0, the span is 4643a2cdcdd2SPaul Dagnelie * always 1, so the math works out. 4644a2cdcdd2SPaul Dagnelie * 4645a2cdcdd2SPaul Dagnelie * If you make changes to how the zbookmark_compare code works, be sure 4646a2cdcdd2SPaul Dagnelie * to make sure that this code still works afterwards. 4647a2cdcdd2SPaul Dagnelie */ 4648a2cdcdd2SPaul Dagnelie return (zbookmark_compare(dnp->dn_datablkszsec, dnp->dn_indblkshift, 4649a2cdcdd2SPaul Dagnelie 1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT), 0, &mod_zb, 4650a2cdcdd2SPaul Dagnelie last_block) <= 0); 4651ad135b5dSChristopher Siden } 4652