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 /* 22a3f829aeSBill Moore * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #include <sys/zfs_context.h> 27ea8dc4b6Seschrock #include <sys/fm/fs/zfs.h> 28fa9e4066Sahrens #include <sys/spa.h> 29fa9e4066Sahrens #include <sys/txg.h> 30fa9e4066Sahrens #include <sys/spa_impl.h> 31fa9e4066Sahrens #include <sys/vdev_impl.h> 32fa9e4066Sahrens #include <sys/zio_impl.h> 33fa9e4066Sahrens #include <sys/zio_compress.h> 34fa9e4066Sahrens #include <sys/zio_checksum.h> 35b24ab676SJeff Bonwick #include <sys/dmu_objset.h> 36b24ab676SJeff Bonwick #include <sys/arc.h> 37b24ab676SJeff Bonwick #include <sys/ddt.h> 38fa9e4066Sahrens 39fa9e4066Sahrens /* 40fa9e4066Sahrens * ========================================================================== 41fa9e4066Sahrens * I/O priority table 42fa9e4066Sahrens * ========================================================================== 43fa9e4066Sahrens */ 44fa9e4066Sahrens uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE] = { 45fa9e4066Sahrens 0, /* ZIO_PRIORITY_NOW */ 46fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_READ */ 47fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_WRITE */ 48fa9e4066Sahrens 0, /* ZIO_PRIORITY_LOG_WRITE */ 4980eb36f2SGeorge Wilson 1, /* ZIO_PRIORITY_CACHE_FILL */ 5080eb36f2SGeorge Wilson 1, /* ZIO_PRIORITY_AGG */ 5180eb36f2SGeorge Wilson 4, /* ZIO_PRIORITY_FREE */ 5280eb36f2SGeorge Wilson 4, /* ZIO_PRIORITY_ASYNC_WRITE */ 5380eb36f2SGeorge Wilson 6, /* ZIO_PRIORITY_ASYNC_READ */ 54fa9e4066Sahrens 10, /* ZIO_PRIORITY_RESILVER */ 55fa9e4066Sahrens 20, /* ZIO_PRIORITY_SCRUB */ 56fa9e4066Sahrens }; 57fa9e4066Sahrens 58fa9e4066Sahrens /* 59fa9e4066Sahrens * ========================================================================== 60fa9e4066Sahrens * I/O type descriptions 61fa9e4066Sahrens * ========================================================================== 62fa9e4066Sahrens */ 63fa9e4066Sahrens char *zio_type_name[ZIO_TYPES] = { 6480eb36f2SGeorge Wilson "zio_null", "zio_read", "zio_write", "zio_free", "zio_claim", 6580eb36f2SGeorge Wilson "zio_ioctl" 6680eb36f2SGeorge Wilson }; 67fa9e4066Sahrens 68fa9e4066Sahrens /* 69fa9e4066Sahrens * ========================================================================== 70fa9e4066Sahrens * I/O kmem caches 71fa9e4066Sahrens * ========================================================================== 72fa9e4066Sahrens */ 73ccae0b50Seschrock kmem_cache_t *zio_cache; 74a3f829aeSBill Moore kmem_cache_t *zio_link_cache; 75fa9e4066Sahrens kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 76ad23a2dbSjohansen kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 77ad23a2dbSjohansen 78ad23a2dbSjohansen #ifdef _KERNEL 79ad23a2dbSjohansen extern vmem_t *zio_alloc_arena; 80ad23a2dbSjohansen #endif 81fa9e4066Sahrens 820a4e9518Sgw /* 83e14bb325SJeff Bonwick * An allocating zio is one that either currently has the DVA allocate 84e14bb325SJeff Bonwick * stage set or will have it later in its lifetime. 850a4e9518Sgw */ 86b24ab676SJeff Bonwick #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) 87b24ab676SJeff Bonwick 88*35a5a358SJonathan Adams boolean_t zio_requeue_io_start_cut_in_line = B_TRUE; 89*35a5a358SJonathan Adams 90b24ab676SJeff Bonwick #ifdef ZFS_DEBUG 91b24ab676SJeff Bonwick int zio_buf_debug_limit = 16384; 92b24ab676SJeff Bonwick #else 93b24ab676SJeff Bonwick int zio_buf_debug_limit = 0; 94b24ab676SJeff Bonwick #endif 950a4e9518Sgw 96fa9e4066Sahrens void 97fa9e4066Sahrens zio_init(void) 98fa9e4066Sahrens { 99fa9e4066Sahrens size_t c; 100ad23a2dbSjohansen vmem_t *data_alloc_arena = NULL; 101ad23a2dbSjohansen 102ad23a2dbSjohansen #ifdef _KERNEL 103ad23a2dbSjohansen data_alloc_arena = zio_alloc_arena; 104ad23a2dbSjohansen #endif 105a3f829aeSBill Moore zio_cache = kmem_cache_create("zio_cache", 106a3f829aeSBill Moore sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 107a3f829aeSBill Moore zio_link_cache = kmem_cache_create("zio_link_cache", 108a3f829aeSBill Moore sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 109ccae0b50Seschrock 110fa9e4066Sahrens /* 111fa9e4066Sahrens * For small buffers, we want a cache for each multiple of 112fa9e4066Sahrens * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache 113fa9e4066Sahrens * for each quarter-power of 2. For large buffers, we want 114fa9e4066Sahrens * a cache for each multiple of PAGESIZE. 115fa9e4066Sahrens */ 116fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 117fa9e4066Sahrens size_t size = (c + 1) << SPA_MINBLOCKSHIFT; 118fa9e4066Sahrens size_t p2 = size; 119fa9e4066Sahrens size_t align = 0; 120fa9e4066Sahrens 121fa9e4066Sahrens while (p2 & (p2 - 1)) 122fa9e4066Sahrens p2 &= p2 - 1; 123fa9e4066Sahrens 124fa9e4066Sahrens if (size <= 4 * SPA_MINBLOCKSIZE) { 125fa9e4066Sahrens align = SPA_MINBLOCKSIZE; 126fa9e4066Sahrens } else if (P2PHASE(size, PAGESIZE) == 0) { 127fa9e4066Sahrens align = PAGESIZE; 128fa9e4066Sahrens } else if (P2PHASE(size, p2 >> 2) == 0) { 129fa9e4066Sahrens align = p2 >> 2; 130fa9e4066Sahrens } 131fa9e4066Sahrens 132fa9e4066Sahrens if (align != 0) { 133ad23a2dbSjohansen char name[36]; 1345ad82045Snd (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); 135fa9e4066Sahrens zio_buf_cache[c] = kmem_cache_create(name, size, 136b24ab676SJeff Bonwick align, NULL, NULL, NULL, NULL, NULL, 137b24ab676SJeff Bonwick size > zio_buf_debug_limit ? KMC_NODEBUG : 0); 138ad23a2dbSjohansen 139ad23a2dbSjohansen (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); 140ad23a2dbSjohansen zio_data_buf_cache[c] = kmem_cache_create(name, size, 141ad23a2dbSjohansen align, NULL, NULL, NULL, NULL, data_alloc_arena, 142b24ab676SJeff Bonwick size > zio_buf_debug_limit ? KMC_NODEBUG : 0); 143fa9e4066Sahrens } 144fa9e4066Sahrens } 145fa9e4066Sahrens 146fa9e4066Sahrens while (--c != 0) { 147fa9e4066Sahrens ASSERT(zio_buf_cache[c] != NULL); 148fa9e4066Sahrens if (zio_buf_cache[c - 1] == NULL) 149fa9e4066Sahrens zio_buf_cache[c - 1] = zio_buf_cache[c]; 150ad23a2dbSjohansen 151ad23a2dbSjohansen ASSERT(zio_data_buf_cache[c] != NULL); 152ad23a2dbSjohansen if (zio_data_buf_cache[c - 1] == NULL) 153ad23a2dbSjohansen zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; 154fa9e4066Sahrens } 155ea8dc4b6Seschrock 156ea8dc4b6Seschrock zio_inject_init(); 157fa9e4066Sahrens } 158fa9e4066Sahrens 159fa9e4066Sahrens void 160fa9e4066Sahrens zio_fini(void) 161fa9e4066Sahrens { 162fa9e4066Sahrens size_t c; 163fa9e4066Sahrens kmem_cache_t *last_cache = NULL; 164ad23a2dbSjohansen kmem_cache_t *last_data_cache = NULL; 165fa9e4066Sahrens 166fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 167fa9e4066Sahrens if (zio_buf_cache[c] != last_cache) { 168fa9e4066Sahrens last_cache = zio_buf_cache[c]; 169fa9e4066Sahrens kmem_cache_destroy(zio_buf_cache[c]); 170fa9e4066Sahrens } 171fa9e4066Sahrens zio_buf_cache[c] = NULL; 172ad23a2dbSjohansen 173ad23a2dbSjohansen if (zio_data_buf_cache[c] != last_data_cache) { 174ad23a2dbSjohansen last_data_cache = zio_data_buf_cache[c]; 175ad23a2dbSjohansen kmem_cache_destroy(zio_data_buf_cache[c]); 176ad23a2dbSjohansen } 177ad23a2dbSjohansen zio_data_buf_cache[c] = NULL; 178fa9e4066Sahrens } 179ea8dc4b6Seschrock 180a3f829aeSBill Moore kmem_cache_destroy(zio_link_cache); 181ccae0b50Seschrock kmem_cache_destroy(zio_cache); 182ccae0b50Seschrock 183ea8dc4b6Seschrock zio_inject_fini(); 184fa9e4066Sahrens } 185fa9e4066Sahrens 186fa9e4066Sahrens /* 187fa9e4066Sahrens * ========================================================================== 188fa9e4066Sahrens * Allocate and free I/O buffers 189fa9e4066Sahrens * ========================================================================== 190fa9e4066Sahrens */ 191ad23a2dbSjohansen 192ad23a2dbSjohansen /* 193ad23a2dbSjohansen * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a 194ad23a2dbSjohansen * crashdump if the kernel panics, so use it judiciously. Obviously, it's 195ad23a2dbSjohansen * useful to inspect ZFS metadata, but if possible, we should avoid keeping 196ad23a2dbSjohansen * excess / transient data in-core during a crashdump. 197ad23a2dbSjohansen */ 198fa9e4066Sahrens void * 199fa9e4066Sahrens zio_buf_alloc(size_t size) 200fa9e4066Sahrens { 201fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 202fa9e4066Sahrens 203fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 204fa9e4066Sahrens 2051ab7f2deSmaybee return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); 206fa9e4066Sahrens } 207fa9e4066Sahrens 208ad23a2dbSjohansen /* 209ad23a2dbSjohansen * Use zio_data_buf_alloc to allocate data. The data will not appear in a 210ad23a2dbSjohansen * crashdump if the kernel panics. This exists so that we will limit the amount 211ad23a2dbSjohansen * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount 212ad23a2dbSjohansen * of kernel heap dumped to disk when the kernel panics) 213ad23a2dbSjohansen */ 214ad23a2dbSjohansen void * 215ad23a2dbSjohansen zio_data_buf_alloc(size_t size) 216ad23a2dbSjohansen { 217ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 218ad23a2dbSjohansen 219ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 220ad23a2dbSjohansen 2211ab7f2deSmaybee return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); 222ad23a2dbSjohansen } 223ad23a2dbSjohansen 224fa9e4066Sahrens void 225fa9e4066Sahrens zio_buf_free(void *buf, size_t size) 226fa9e4066Sahrens { 227fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 228fa9e4066Sahrens 229fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 230fa9e4066Sahrens 231fa9e4066Sahrens kmem_cache_free(zio_buf_cache[c], buf); 232fa9e4066Sahrens } 233fa9e4066Sahrens 234ad23a2dbSjohansen void 235ad23a2dbSjohansen zio_data_buf_free(void *buf, size_t size) 236ad23a2dbSjohansen { 237ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 238ad23a2dbSjohansen 239ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 240ad23a2dbSjohansen 241ad23a2dbSjohansen kmem_cache_free(zio_data_buf_cache[c], buf); 242ad23a2dbSjohansen } 243b3995adbSahrens 244fa9e4066Sahrens /* 245fa9e4066Sahrens * ========================================================================== 246fa9e4066Sahrens * Push and pop I/O transform buffers 247fa9e4066Sahrens * ========================================================================== 248fa9e4066Sahrens */ 249fa9e4066Sahrens static void 250e14bb325SJeff Bonwick zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, 251e14bb325SJeff Bonwick zio_transform_func_t *transform) 252fa9e4066Sahrens { 253fa9e4066Sahrens zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); 254fa9e4066Sahrens 255e14bb325SJeff Bonwick zt->zt_orig_data = zio->io_data; 256e14bb325SJeff Bonwick zt->zt_orig_size = zio->io_size; 257fa9e4066Sahrens zt->zt_bufsize = bufsize; 258e14bb325SJeff Bonwick zt->zt_transform = transform; 259fa9e4066Sahrens 260fa9e4066Sahrens zt->zt_next = zio->io_transform_stack; 261fa9e4066Sahrens zio->io_transform_stack = zt; 262fa9e4066Sahrens 263fa9e4066Sahrens zio->io_data = data; 264fa9e4066Sahrens zio->io_size = size; 265fa9e4066Sahrens } 266fa9e4066Sahrens 267fa9e4066Sahrens static void 268e14bb325SJeff Bonwick zio_pop_transforms(zio_t *zio) 269fa9e4066Sahrens { 270e14bb325SJeff Bonwick zio_transform_t *zt; 271e14bb325SJeff Bonwick 272e14bb325SJeff Bonwick while ((zt = zio->io_transform_stack) != NULL) { 273e14bb325SJeff Bonwick if (zt->zt_transform != NULL) 274e14bb325SJeff Bonwick zt->zt_transform(zio, 275e14bb325SJeff Bonwick zt->zt_orig_data, zt->zt_orig_size); 276fa9e4066Sahrens 277b24ab676SJeff Bonwick if (zt->zt_bufsize != 0) 278b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zt->zt_bufsize); 279fa9e4066Sahrens 280e14bb325SJeff Bonwick zio->io_data = zt->zt_orig_data; 281e14bb325SJeff Bonwick zio->io_size = zt->zt_orig_size; 282e14bb325SJeff Bonwick zio->io_transform_stack = zt->zt_next; 283fa9e4066Sahrens 284e14bb325SJeff Bonwick kmem_free(zt, sizeof (zio_transform_t)); 285fa9e4066Sahrens } 286fa9e4066Sahrens } 287fa9e4066Sahrens 288e14bb325SJeff Bonwick /* 289e14bb325SJeff Bonwick * ========================================================================== 290e14bb325SJeff Bonwick * I/O transform callbacks for subblocks and decompression 291e14bb325SJeff Bonwick * ========================================================================== 292e14bb325SJeff Bonwick */ 293e14bb325SJeff Bonwick static void 294e14bb325SJeff Bonwick zio_subblock(zio_t *zio, void *data, uint64_t size) 295e14bb325SJeff Bonwick { 296e14bb325SJeff Bonwick ASSERT(zio->io_size > size); 297e14bb325SJeff Bonwick 298e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ) 299e14bb325SJeff Bonwick bcopy(zio->io_data, data, size); 300e14bb325SJeff Bonwick } 301e14bb325SJeff Bonwick 302e14bb325SJeff Bonwick static void 303e14bb325SJeff Bonwick zio_decompress(zio_t *zio, void *data, uint64_t size) 304e14bb325SJeff Bonwick { 305e14bb325SJeff Bonwick if (zio->io_error == 0 && 306e14bb325SJeff Bonwick zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), 307b24ab676SJeff Bonwick zio->io_data, data, zio->io_size, size) != 0) 308e14bb325SJeff Bonwick zio->io_error = EIO; 309e14bb325SJeff Bonwick } 310e14bb325SJeff Bonwick 311e14bb325SJeff Bonwick /* 312e14bb325SJeff Bonwick * ========================================================================== 313e14bb325SJeff Bonwick * I/O parent/child relationships and pipeline interlocks 314e14bb325SJeff Bonwick * ========================================================================== 315e14bb325SJeff Bonwick */ 316a3f829aeSBill Moore /* 317a3f829aeSBill Moore * NOTE - Callers to zio_walk_parents() and zio_walk_children must 318a3f829aeSBill Moore * continue calling these functions until they return NULL. 319a3f829aeSBill Moore * Otherwise, the next caller will pick up the list walk in 320a3f829aeSBill Moore * some indeterminate state. (Otherwise every caller would 321a3f829aeSBill Moore * have to pass in a cookie to keep the state represented by 322a3f829aeSBill Moore * io_walk_link, which gets annoying.) 323a3f829aeSBill Moore */ 324a3f829aeSBill Moore zio_t * 325a3f829aeSBill Moore zio_walk_parents(zio_t *cio) 326a3f829aeSBill Moore { 327a3f829aeSBill Moore zio_link_t *zl = cio->io_walk_link; 328a3f829aeSBill Moore list_t *pl = &cio->io_parent_list; 329e14bb325SJeff Bonwick 330a3f829aeSBill Moore zl = (zl == NULL) ? list_head(pl) : list_next(pl, zl); 331a3f829aeSBill Moore cio->io_walk_link = zl; 332a3f829aeSBill Moore 333a3f829aeSBill Moore if (zl == NULL) 334a3f829aeSBill Moore return (NULL); 335a3f829aeSBill Moore 336a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 337a3f829aeSBill Moore return (zl->zl_parent); 338a3f829aeSBill Moore } 339a3f829aeSBill Moore 340a3f829aeSBill Moore zio_t * 341a3f829aeSBill Moore zio_walk_children(zio_t *pio) 342a3f829aeSBill Moore { 343a3f829aeSBill Moore zio_link_t *zl = pio->io_walk_link; 344a3f829aeSBill Moore list_t *cl = &pio->io_child_list; 345a3f829aeSBill Moore 346a3f829aeSBill Moore zl = (zl == NULL) ? list_head(cl) : list_next(cl, zl); 347a3f829aeSBill Moore pio->io_walk_link = zl; 348a3f829aeSBill Moore 349a3f829aeSBill Moore if (zl == NULL) 350a3f829aeSBill Moore return (NULL); 351a3f829aeSBill Moore 352a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 353a3f829aeSBill Moore return (zl->zl_child); 354a3f829aeSBill Moore } 355a3f829aeSBill Moore 356a3f829aeSBill Moore zio_t * 357a3f829aeSBill Moore zio_unique_parent(zio_t *cio) 358a3f829aeSBill Moore { 359a3f829aeSBill Moore zio_t *pio = zio_walk_parents(cio); 360a3f829aeSBill Moore 361a3f829aeSBill Moore VERIFY(zio_walk_parents(cio) == NULL); 362a3f829aeSBill Moore return (pio); 363a3f829aeSBill Moore } 364a3f829aeSBill Moore 365a3f829aeSBill Moore void 366a3f829aeSBill Moore zio_add_child(zio_t *pio, zio_t *cio) 367e14bb325SJeff Bonwick { 368a3f829aeSBill Moore zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); 369a3f829aeSBill Moore 370a3f829aeSBill Moore /* 371a3f829aeSBill Moore * Logical I/Os can have logical, gang, or vdev children. 372a3f829aeSBill Moore * Gang I/Os can have gang or vdev children. 373a3f829aeSBill Moore * Vdev I/Os can only have vdev children. 374a3f829aeSBill Moore * The following ASSERT captures all of these constraints. 375a3f829aeSBill Moore */ 376a3f829aeSBill Moore ASSERT(cio->io_child_type <= pio->io_child_type); 377a3f829aeSBill Moore 378a3f829aeSBill Moore zl->zl_parent = pio; 379a3f829aeSBill Moore zl->zl_child = cio; 380a3f829aeSBill Moore 381a3f829aeSBill Moore mutex_enter(&cio->io_lock); 382e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 383a3f829aeSBill Moore 384a3f829aeSBill Moore ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); 385a3f829aeSBill Moore 386a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 387a3f829aeSBill Moore pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; 388a3f829aeSBill Moore 389a3f829aeSBill Moore list_insert_head(&pio->io_child_list, zl); 390a3f829aeSBill Moore list_insert_head(&cio->io_parent_list, zl); 391a3f829aeSBill Moore 392b24ab676SJeff Bonwick pio->io_child_count++; 393b24ab676SJeff Bonwick cio->io_parent_count++; 394b24ab676SJeff Bonwick 395e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 396a3f829aeSBill Moore mutex_exit(&cio->io_lock); 397e14bb325SJeff Bonwick } 398e14bb325SJeff Bonwick 399fa9e4066Sahrens static void 400a3f829aeSBill Moore zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) 401e14bb325SJeff Bonwick { 402a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 403a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 404e14bb325SJeff Bonwick 405a3f829aeSBill Moore mutex_enter(&cio->io_lock); 406e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 407a3f829aeSBill Moore 408a3f829aeSBill Moore list_remove(&pio->io_child_list, zl); 409a3f829aeSBill Moore list_remove(&cio->io_parent_list, zl); 410a3f829aeSBill Moore 411b24ab676SJeff Bonwick pio->io_child_count--; 412b24ab676SJeff Bonwick cio->io_parent_count--; 413b24ab676SJeff Bonwick 414e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 415a3f829aeSBill Moore mutex_exit(&cio->io_lock); 416a3f829aeSBill Moore 417a3f829aeSBill Moore kmem_cache_free(zio_link_cache, zl); 418e14bb325SJeff Bonwick } 419e14bb325SJeff Bonwick 420e14bb325SJeff Bonwick static boolean_t 421e14bb325SJeff Bonwick zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) 422fa9e4066Sahrens { 423e14bb325SJeff Bonwick uint64_t *countp = &zio->io_children[child][wait]; 424e14bb325SJeff Bonwick boolean_t waiting = B_FALSE; 425e14bb325SJeff Bonwick 426e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 427e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 428e14bb325SJeff Bonwick if (*countp != 0) { 429b24ab676SJeff Bonwick zio->io_stage >>= 1; 430e14bb325SJeff Bonwick zio->io_stall = countp; 431e14bb325SJeff Bonwick waiting = B_TRUE; 432e14bb325SJeff Bonwick } 433e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 434e14bb325SJeff Bonwick 435e14bb325SJeff Bonwick return (waiting); 436e14bb325SJeff Bonwick } 437fa9e4066Sahrens 438e14bb325SJeff Bonwick static void 439e14bb325SJeff Bonwick zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) 440e14bb325SJeff Bonwick { 441e14bb325SJeff Bonwick uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; 442e14bb325SJeff Bonwick int *errorp = &pio->io_child_error[zio->io_child_type]; 443fa9e4066Sahrens 444e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 445e14bb325SJeff Bonwick if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 446e14bb325SJeff Bonwick *errorp = zio_worst_error(*errorp, zio->io_error); 447e14bb325SJeff Bonwick pio->io_reexecute |= zio->io_reexecute; 448e14bb325SJeff Bonwick ASSERT3U(*countp, >, 0); 449e14bb325SJeff Bonwick if (--*countp == 0 && pio->io_stall == countp) { 450e14bb325SJeff Bonwick pio->io_stall = NULL; 451e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 452e14bb325SJeff Bonwick zio_execute(pio); 453e14bb325SJeff Bonwick } else { 454e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 455fa9e4066Sahrens } 456fa9e4066Sahrens } 457fa9e4066Sahrens 458e14bb325SJeff Bonwick static void 459e14bb325SJeff Bonwick zio_inherit_child_errors(zio_t *zio, enum zio_child c) 460e14bb325SJeff Bonwick { 461e14bb325SJeff Bonwick if (zio->io_child_error[c] != 0 && zio->io_error == 0) 462e14bb325SJeff Bonwick zio->io_error = zio->io_child_error[c]; 463e14bb325SJeff Bonwick } 464e14bb325SJeff Bonwick 465fa9e4066Sahrens /* 466fa9e4066Sahrens * ========================================================================== 467e14bb325SJeff Bonwick * Create the various types of I/O (read, write, free, etc) 468fa9e4066Sahrens * ========================================================================== 469fa9e4066Sahrens */ 470fa9e4066Sahrens static zio_t * 471b24ab676SJeff Bonwick zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 472fa9e4066Sahrens void *data, uint64_t size, zio_done_func_t *done, void *private, 473b24ab676SJeff Bonwick zio_type_t type, int priority, enum zio_flag flags, 474b24ab676SJeff Bonwick vdev_t *vd, uint64_t offset, const zbookmark_t *zb, 475b24ab676SJeff Bonwick enum zio_stage stage, enum zio_stage pipeline) 476fa9e4066Sahrens { 477fa9e4066Sahrens zio_t *zio; 478fa9e4066Sahrens 479fa9e4066Sahrens ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); 480fa9e4066Sahrens ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); 481e14bb325SJeff Bonwick ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); 482fa9e4066Sahrens 483e14bb325SJeff Bonwick ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); 484e14bb325SJeff Bonwick ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); 485e14bb325SJeff Bonwick ASSERT(vd || stage == ZIO_STAGE_OPEN); 486088f3894Sahrens 487ccae0b50Seschrock zio = kmem_cache_alloc(zio_cache, KM_SLEEP); 488ccae0b50Seschrock bzero(zio, sizeof (zio_t)); 489e14bb325SJeff Bonwick 490e14bb325SJeff Bonwick mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); 491e14bb325SJeff Bonwick cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); 492e14bb325SJeff Bonwick 493a3f829aeSBill Moore list_create(&zio->io_parent_list, sizeof (zio_link_t), 494a3f829aeSBill Moore offsetof(zio_link_t, zl_parent_node)); 495a3f829aeSBill Moore list_create(&zio->io_child_list, sizeof (zio_link_t), 496a3f829aeSBill Moore offsetof(zio_link_t, zl_child_node)); 497a3f829aeSBill Moore 498e14bb325SJeff Bonwick if (vd != NULL) 499e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_VDEV; 500e14bb325SJeff Bonwick else if (flags & ZIO_FLAG_GANG_CHILD) 501e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_GANG; 502b24ab676SJeff Bonwick else if (flags & ZIO_FLAG_DDT_CHILD) 503b24ab676SJeff Bonwick zio->io_child_type = ZIO_CHILD_DDT; 504e14bb325SJeff Bonwick else 505e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_LOGICAL; 506e14bb325SJeff Bonwick 507fa9e4066Sahrens if (bp != NULL) { 508b24ab676SJeff Bonwick zio->io_bp = (blkptr_t *)bp; 509fa9e4066Sahrens zio->io_bp_copy = *bp; 510fa9e4066Sahrens zio->io_bp_orig = *bp; 511b24ab676SJeff Bonwick if (type != ZIO_TYPE_WRITE || 512b24ab676SJeff Bonwick zio->io_child_type == ZIO_CHILD_DDT) 513e14bb325SJeff Bonwick zio->io_bp = &zio->io_bp_copy; /* so caller can free */ 514f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL) 515e14bb325SJeff Bonwick zio->io_logical = zio; 516f5383399SBill Moore if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) 517f5383399SBill Moore pipeline |= ZIO_GANG_STAGES; 518fa9e4066Sahrens } 519e14bb325SJeff Bonwick 520e14bb325SJeff Bonwick zio->io_spa = spa; 521e14bb325SJeff Bonwick zio->io_txg = txg; 522fa9e4066Sahrens zio->io_done = done; 523fa9e4066Sahrens zio->io_private = private; 524fa9e4066Sahrens zio->io_type = type; 525fa9e4066Sahrens zio->io_priority = priority; 526e14bb325SJeff Bonwick zio->io_vd = vd; 527e14bb325SJeff Bonwick zio->io_offset = offset; 528b24ab676SJeff Bonwick zio->io_orig_data = zio->io_data = data; 529b24ab676SJeff Bonwick zio->io_orig_size = zio->io_size = size; 530e14bb325SJeff Bonwick zio->io_orig_flags = zio->io_flags = flags; 531e14bb325SJeff Bonwick zio->io_orig_stage = zio->io_stage = stage; 532e14bb325SJeff Bonwick zio->io_orig_pipeline = zio->io_pipeline = pipeline; 533fa9e4066Sahrens 534a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); 535a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); 536a3f829aeSBill Moore 537e14bb325SJeff Bonwick if (zb != NULL) 538e14bb325SJeff Bonwick zio->io_bookmark = *zb; 539e14bb325SJeff Bonwick 540e14bb325SJeff Bonwick if (pio != NULL) { 541e14bb325SJeff Bonwick if (zio->io_logical == NULL) 542ea8dc4b6Seschrock zio->io_logical = pio->io_logical; 543f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_GANG) 544f5383399SBill Moore zio->io_gang_leader = pio->io_gang_leader; 545e14bb325SJeff Bonwick zio_add_child(pio, zio); 546fa9e4066Sahrens } 547fa9e4066Sahrens 548fa9e4066Sahrens return (zio); 549fa9e4066Sahrens } 550fa9e4066Sahrens 5510a4e9518Sgw static void 552e14bb325SJeff Bonwick zio_destroy(zio_t *zio) 5530a4e9518Sgw { 554a3f829aeSBill Moore list_destroy(&zio->io_parent_list); 555a3f829aeSBill Moore list_destroy(&zio->io_child_list); 556e14bb325SJeff Bonwick mutex_destroy(&zio->io_lock); 557e14bb325SJeff Bonwick cv_destroy(&zio->io_cv); 558e14bb325SJeff Bonwick kmem_cache_free(zio_cache, zio); 5590a4e9518Sgw } 5600a4e9518Sgw 561fa9e4066Sahrens zio_t * 562a3f829aeSBill Moore zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, 563b24ab676SJeff Bonwick void *private, enum zio_flag flags) 564fa9e4066Sahrens { 565fa9e4066Sahrens zio_t *zio; 566fa9e4066Sahrens 567fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 568a3f829aeSBill Moore ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 569e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); 570fa9e4066Sahrens 571fa9e4066Sahrens return (zio); 572fa9e4066Sahrens } 573fa9e4066Sahrens 574fa9e4066Sahrens zio_t * 575b24ab676SJeff Bonwick zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) 576fa9e4066Sahrens { 577a3f829aeSBill Moore return (zio_null(NULL, spa, NULL, done, private, flags)); 578fa9e4066Sahrens } 579fa9e4066Sahrens 580fa9e4066Sahrens zio_t * 581e14bb325SJeff Bonwick zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 582e14bb325SJeff Bonwick void *data, uint64_t size, zio_done_func_t *done, void *private, 583b24ab676SJeff Bonwick int priority, enum zio_flag flags, const zbookmark_t *zb) 584fa9e4066Sahrens { 585fa9e4066Sahrens zio_t *zio; 586fa9e4066Sahrens 587b24ab676SJeff Bonwick zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, 588088f3894Sahrens data, size, done, private, 589e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, NULL, 0, zb, 590b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 591b24ab676SJeff Bonwick ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); 592fa9e4066Sahrens 593fa9e4066Sahrens return (zio); 594fa9e4066Sahrens } 595fa9e4066Sahrens 596fa9e4066Sahrens zio_t * 597e14bb325SJeff Bonwick zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 598b24ab676SJeff Bonwick void *data, uint64_t size, const zio_prop_t *zp, 599e14bb325SJeff Bonwick zio_done_func_t *ready, zio_done_func_t *done, void *private, 600b24ab676SJeff Bonwick int priority, enum zio_flag flags, const zbookmark_t *zb) 601fa9e4066Sahrens { 602fa9e4066Sahrens zio_t *zio; 603fa9e4066Sahrens 604e14bb325SJeff Bonwick ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && 605e14bb325SJeff Bonwick zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && 606e14bb325SJeff Bonwick zp->zp_compress >= ZIO_COMPRESS_OFF && 607e14bb325SJeff Bonwick zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && 608e14bb325SJeff Bonwick zp->zp_type < DMU_OT_NUMTYPES && 609e14bb325SJeff Bonwick zp->zp_level < 32 && 610b24ab676SJeff Bonwick zp->zp_copies > 0 && 611b24ab676SJeff Bonwick zp->zp_copies <= spa_max_replication(spa) && 612b24ab676SJeff Bonwick zp->zp_dedup <= 1 && 613b24ab676SJeff Bonwick zp->zp_dedup_verify <= 1); 6140a4e9518Sgw 615fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 616e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 617b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 618b24ab676SJeff Bonwick ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); 619fa9e4066Sahrens 620c717a561Smaybee zio->io_ready = ready; 621e14bb325SJeff Bonwick zio->io_prop = *zp; 622fa9e4066Sahrens 623fa9e4066Sahrens return (zio); 624fa9e4066Sahrens } 625fa9e4066Sahrens 626fa9e4066Sahrens zio_t * 627e14bb325SJeff Bonwick zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, 628e14bb325SJeff Bonwick uint64_t size, zio_done_func_t *done, void *private, int priority, 629b24ab676SJeff Bonwick enum zio_flag flags, zbookmark_t *zb) 630fa9e4066Sahrens { 631fa9e4066Sahrens zio_t *zio; 632fa9e4066Sahrens 633fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 634e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 635e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); 636fa9e4066Sahrens 637fa9e4066Sahrens return (zio); 638fa9e4066Sahrens } 639fa9e4066Sahrens 640b24ab676SJeff Bonwick void 641b24ab676SJeff Bonwick zio_write_override(zio_t *zio, blkptr_t *bp, int copies) 642b24ab676SJeff Bonwick { 643b24ab676SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 644b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 645b24ab676SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 646b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); 647b24ab676SJeff Bonwick 648b24ab676SJeff Bonwick zio->io_prop.zp_copies = copies; 649b24ab676SJeff Bonwick zio->io_bp_override = bp; 650b24ab676SJeff Bonwick } 651b24ab676SJeff Bonwick 652b24ab676SJeff Bonwick void 653b24ab676SJeff Bonwick zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) 654b24ab676SJeff Bonwick { 655b24ab676SJeff Bonwick bplist_enqueue_deferred(&spa->spa_free_bplist[txg & TXG_MASK], bp); 656b24ab676SJeff Bonwick } 657b24ab676SJeff Bonwick 658fa9e4066Sahrens zio_t * 659b24ab676SJeff Bonwick zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 660b24ab676SJeff Bonwick enum zio_flag flags) 661fa9e4066Sahrens { 662fa9e4066Sahrens zio_t *zio; 663fa9e4066Sahrens 664fa9e4066Sahrens ASSERT(!BP_IS_HOLE(bp)); 665b24ab676SJeff Bonwick ASSERT(spa_syncing_txg(spa) == txg); 666b24ab676SJeff Bonwick ASSERT(spa_sync_pass(spa) <= SYNC_PASS_DEFERRED_FREE); 667fa9e4066Sahrens 668e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 669b24ab676SJeff Bonwick NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, flags, 670e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_FREE_PIPELINE); 671fa9e4066Sahrens 672fa9e4066Sahrens return (zio); 673fa9e4066Sahrens } 674fa9e4066Sahrens 675fa9e4066Sahrens zio_t * 676b24ab676SJeff Bonwick zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 677b24ab676SJeff Bonwick zio_done_func_t *done, void *private, enum zio_flag flags) 678fa9e4066Sahrens { 679fa9e4066Sahrens zio_t *zio; 680fa9e4066Sahrens 681fa9e4066Sahrens /* 682fa9e4066Sahrens * A claim is an allocation of a specific block. Claims are needed 683fa9e4066Sahrens * to support immediate writes in the intent log. The issue is that 684fa9e4066Sahrens * immediate writes contain committed data, but in a txg that was 685fa9e4066Sahrens * *not* committed. Upon opening the pool after an unclean shutdown, 686fa9e4066Sahrens * the intent log claims all blocks that contain immediate write data 687fa9e4066Sahrens * so that the SPA knows they're in use. 688fa9e4066Sahrens * 689fa9e4066Sahrens * All claims *must* be resolved in the first txg -- before the SPA 690fa9e4066Sahrens * starts allocating blocks -- so that nothing is allocated twice. 691b24ab676SJeff Bonwick * If txg == 0 we just verify that the block is claimable. 692fa9e4066Sahrens */ 693fa9e4066Sahrens ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); 694b24ab676SJeff Bonwick ASSERT(txg == spa_first_txg(spa) || txg == 0); 695b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ 696fa9e4066Sahrens 697e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 698e14bb325SJeff Bonwick done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, 699e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); 700fa9e4066Sahrens 701fa9e4066Sahrens return (zio); 702fa9e4066Sahrens } 703fa9e4066Sahrens 704fa9e4066Sahrens zio_t * 705fa9e4066Sahrens zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 706b24ab676SJeff Bonwick zio_done_func_t *done, void *private, int priority, enum zio_flag flags) 707fa9e4066Sahrens { 708fa9e4066Sahrens zio_t *zio; 709fa9e4066Sahrens int c; 710fa9e4066Sahrens 711fa9e4066Sahrens if (vd->vdev_children == 0) { 712fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 713e14bb325SJeff Bonwick ZIO_TYPE_IOCTL, priority, flags, vd, 0, NULL, 714fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); 715fa9e4066Sahrens 716fa9e4066Sahrens zio->io_cmd = cmd; 717fa9e4066Sahrens } else { 718a3f829aeSBill Moore zio = zio_null(pio, spa, NULL, NULL, NULL, flags); 719fa9e4066Sahrens 720fa9e4066Sahrens for (c = 0; c < vd->vdev_children; c++) 721fa9e4066Sahrens zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, 722fa9e4066Sahrens done, private, priority, flags)); 723fa9e4066Sahrens } 724fa9e4066Sahrens 725fa9e4066Sahrens return (zio); 726fa9e4066Sahrens } 727fa9e4066Sahrens 728fa9e4066Sahrens zio_t * 729fa9e4066Sahrens zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 730fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 731b24ab676SJeff Bonwick int priority, enum zio_flag flags, boolean_t labels) 732fa9e4066Sahrens { 733fa9e4066Sahrens zio_t *zio; 7340a4e9518Sgw 735e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 736e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 737e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 738e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 739fa9e4066Sahrens 740e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 741e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, vd, offset, NULL, 742fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); 743fa9e4066Sahrens 744e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 745fa9e4066Sahrens 746fa9e4066Sahrens return (zio); 747fa9e4066Sahrens } 748fa9e4066Sahrens 749fa9e4066Sahrens zio_t * 750fa9e4066Sahrens zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 751fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 752b24ab676SJeff Bonwick int priority, enum zio_flag flags, boolean_t labels) 753fa9e4066Sahrens { 754fa9e4066Sahrens zio_t *zio; 7550a4e9518Sgw 756e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 757e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 758e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 759e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 760fa9e4066Sahrens 761e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 762e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL, 763fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); 764fa9e4066Sahrens 765e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 766fa9e4066Sahrens 767fa9e4066Sahrens if (zio_checksum_table[checksum].ci_zbt) { 768fa9e4066Sahrens /* 769fa9e4066Sahrens * zbt checksums are necessarily destructive -- they modify 770e14bb325SJeff Bonwick * the end of the write buffer to hold the verifier/checksum. 771fa9e4066Sahrens * Therefore, we must make a local copy in case the data is 772e14bb325SJeff Bonwick * being written to multiple places in parallel. 773fa9e4066Sahrens */ 774e14bb325SJeff Bonwick void *wbuf = zio_buf_alloc(size); 775fa9e4066Sahrens bcopy(data, wbuf, size); 776e14bb325SJeff Bonwick zio_push_transform(zio, wbuf, size, size, NULL); 777fa9e4066Sahrens } 778fa9e4066Sahrens 779fa9e4066Sahrens return (zio); 780fa9e4066Sahrens } 781fa9e4066Sahrens 782fa9e4066Sahrens /* 783e14bb325SJeff Bonwick * Create a child I/O to do some work for us. 784fa9e4066Sahrens */ 785fa9e4066Sahrens zio_t * 786e14bb325SJeff Bonwick zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, 787b24ab676SJeff Bonwick void *data, uint64_t size, int type, int priority, enum zio_flag flags, 788fa9e4066Sahrens zio_done_func_t *done, void *private) 789fa9e4066Sahrens { 790b24ab676SJeff Bonwick enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; 791e14bb325SJeff Bonwick zio_t *zio; 792e14bb325SJeff Bonwick 793e14bb325SJeff Bonwick ASSERT(vd->vdev_parent == 794e14bb325SJeff Bonwick (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); 795fa9e4066Sahrens 796fa9e4066Sahrens if (type == ZIO_TYPE_READ && bp != NULL) { 797fa9e4066Sahrens /* 798fa9e4066Sahrens * If we have the bp, then the child should perform the 799fa9e4066Sahrens * checksum and the parent need not. This pushes error 800fa9e4066Sahrens * detection as close to the leaves as possible and 801fa9e4066Sahrens * eliminates redundant checksums in the interior nodes. 802fa9e4066Sahrens */ 803b24ab676SJeff Bonwick pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; 804b24ab676SJeff Bonwick pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 805fa9e4066Sahrens } 806fa9e4066Sahrens 807e14bb325SJeff Bonwick if (vd->vdev_children == 0) 808e14bb325SJeff Bonwick offset += VDEV_LABEL_START_SIZE; 809e14bb325SJeff Bonwick 810b24ab676SJeff Bonwick flags |= ZIO_VDEV_CHILD_FLAGS(pio) | ZIO_FLAG_DONT_PROPAGATE; 811b24ab676SJeff Bonwick 812b24ab676SJeff Bonwick /* 813b24ab676SJeff Bonwick * If we've decided to do a repair, the write is not speculative -- 814b24ab676SJeff Bonwick * even if the original read was. 815b24ab676SJeff Bonwick */ 816b24ab676SJeff Bonwick if (flags & ZIO_FLAG_IO_REPAIR) 817b24ab676SJeff Bonwick flags &= ~ZIO_FLAG_SPECULATIVE; 818b24ab676SJeff Bonwick 819e14bb325SJeff Bonwick zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, 820b24ab676SJeff Bonwick done, private, type, priority, flags, vd, offset, &pio->io_bookmark, 821b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, pipeline); 822fa9e4066Sahrens 823e14bb325SJeff Bonwick return (zio); 82432b87932Sek } 82532b87932Sek 826e14bb325SJeff Bonwick zio_t * 827e14bb325SJeff Bonwick zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, 828b24ab676SJeff Bonwick int type, int priority, enum zio_flag flags, 829b24ab676SJeff Bonwick zio_done_func_t *done, void *private) 830fa9e4066Sahrens { 831e14bb325SJeff Bonwick zio_t *zio; 832fa9e4066Sahrens 833e14bb325SJeff Bonwick ASSERT(vd->vdev_ops->vdev_op_leaf); 834fa9e4066Sahrens 835e14bb325SJeff Bonwick zio = zio_create(NULL, vd->vdev_spa, 0, NULL, 836e14bb325SJeff Bonwick data, size, done, private, type, priority, 837e14bb325SJeff Bonwick flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY, 838e14bb325SJeff Bonwick vd, offset, NULL, 839b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); 840fa9e4066Sahrens 841e14bb325SJeff Bonwick return (zio); 842e05725b1Sbonwick } 843e05725b1Sbonwick 844e05725b1Sbonwick void 845e14bb325SJeff Bonwick zio_flush(zio_t *zio, vdev_t *vd) 846e05725b1Sbonwick { 847e14bb325SJeff Bonwick zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, 848e14bb325SJeff Bonwick NULL, NULL, ZIO_PRIORITY_NOW, 849e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); 850fa9e4066Sahrens } 851fa9e4066Sahrens 852fa9e4066Sahrens /* 853fa9e4066Sahrens * ========================================================================== 854e14bb325SJeff Bonwick * Prepare to read and write logical blocks 855fa9e4066Sahrens * ========================================================================== 856fa9e4066Sahrens */ 857e14bb325SJeff Bonwick 858e05725b1Sbonwick static int 859e14bb325SJeff Bonwick zio_read_bp_init(zio_t *zio) 860fa9e4066Sahrens { 861e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 862e05725b1Sbonwick 86303361682SJeff Bonwick if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && 864f5383399SBill Moore zio->io_child_type == ZIO_CHILD_LOGICAL && 865f5383399SBill Moore !(zio->io_flags & ZIO_FLAG_RAW)) { 866b24ab676SJeff Bonwick uint64_t psize = BP_GET_PSIZE(bp); 867b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(psize); 868e05725b1Sbonwick 869b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, psize, zio_decompress); 870e14bb325SJeff Bonwick } 871fa9e4066Sahrens 872e14bb325SJeff Bonwick if (!dmu_ot[BP_GET_TYPE(bp)].ot_metadata && BP_GET_LEVEL(bp) == 0) 873e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 874fa9e4066Sahrens 875bbfd46c4SJeff Bonwick if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) 876bbfd46c4SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 877bbfd46c4SJeff Bonwick 878b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) 879b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_READ_PIPELINE; 880b24ab676SJeff Bonwick 881e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 882fa9e4066Sahrens } 883fa9e4066Sahrens 884e05725b1Sbonwick static int 885e14bb325SJeff Bonwick zio_write_bp_init(zio_t *zio) 8860a4e9518Sgw { 887b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 888e14bb325SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 889b24ab676SJeff Bonwick enum zio_compress compress = zp->zp_compress; 890e05725b1Sbonwick blkptr_t *bp = zio->io_bp; 891e14bb325SJeff Bonwick uint64_t lsize = zio->io_size; 892b24ab676SJeff Bonwick uint64_t psize = lsize; 893e14bb325SJeff Bonwick int pass = 1; 894e05725b1Sbonwick 895e14bb325SJeff Bonwick /* 896e14bb325SJeff Bonwick * If our children haven't all reached the ready stage, 897e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 898e14bb325SJeff Bonwick */ 899e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 900e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) 901e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 9020a4e9518Sgw 903e14bb325SJeff Bonwick if (!IO_IS_ALLOCATING(zio)) 904e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 9050a4e9518Sgw 906b24ab676SJeff Bonwick ASSERT(zio->io_child_type != ZIO_CHILD_DDT); 907b24ab676SJeff Bonwick 908b24ab676SJeff Bonwick if (zio->io_bp_override) { 909b24ab676SJeff Bonwick ASSERT(bp->blk_birth != zio->io_txg); 910b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); 911b24ab676SJeff Bonwick 912b24ab676SJeff Bonwick *bp = *zio->io_bp_override; 913b24ab676SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 914b24ab676SJeff Bonwick 915b24ab676SJeff Bonwick if (BP_IS_HOLE(bp) || !zp->zp_dedup) 916b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 917b24ab676SJeff Bonwick 918b24ab676SJeff Bonwick ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup || 919b24ab676SJeff Bonwick zp->zp_dedup_verify); 920b24ab676SJeff Bonwick 921b24ab676SJeff Bonwick if (BP_GET_CHECKSUM(bp) == zp->zp_checksum) { 922b24ab676SJeff Bonwick BP_SET_DEDUP(bp, 1); 923b24ab676SJeff Bonwick zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; 924b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 925b24ab676SJeff Bonwick } 926b24ab676SJeff Bonwick zio->io_bp_override = NULL; 927b24ab676SJeff Bonwick BP_ZERO(bp); 928b24ab676SJeff Bonwick } 9290a4e9518Sgw 930e14bb325SJeff Bonwick if (bp->blk_birth == zio->io_txg) { 931e14bb325SJeff Bonwick /* 932e14bb325SJeff Bonwick * We're rewriting an existing block, which means we're 933e14bb325SJeff Bonwick * working on behalf of spa_sync(). For spa_sync() to 934e14bb325SJeff Bonwick * converge, it must eventually be the case that we don't 935e14bb325SJeff Bonwick * have to allocate new blocks. But compression changes 936e14bb325SJeff Bonwick * the blocksize, which forces a reallocate, and makes 937e14bb325SJeff Bonwick * convergence take longer. Therefore, after the first 938e14bb325SJeff Bonwick * few passes, stop compressing to ensure convergence. 939e14bb325SJeff Bonwick */ 940b24ab676SJeff Bonwick pass = spa_sync_pass(spa); 941b24ab676SJeff Bonwick 942b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(spa)); 943b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 944b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp)); 945e05725b1Sbonwick 946e14bb325SJeff Bonwick if (pass > SYNC_PASS_DONT_COMPRESS) 947e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 948e05725b1Sbonwick 949e14bb325SJeff Bonwick /* Make sure someone doesn't change their mind on overwrites */ 950b24ab676SJeff Bonwick ASSERT(MIN(zp->zp_copies + BP_IS_GANG(bp), 951b24ab676SJeff Bonwick spa_max_replication(spa)) == BP_GET_NDVAS(bp)); 952e14bb325SJeff Bonwick } 953fa9e4066Sahrens 954e14bb325SJeff Bonwick if (compress != ZIO_COMPRESS_OFF) { 955b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(lsize); 956b24ab676SJeff Bonwick psize = zio_compress_data(compress, zio->io_data, cbuf, lsize); 957b24ab676SJeff Bonwick if (psize == 0 || psize == lsize) { 958e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 959b24ab676SJeff Bonwick zio_buf_free(cbuf, lsize); 960b24ab676SJeff Bonwick } else { 961b24ab676SJeff Bonwick ASSERT(psize < lsize); 962b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, lsize, NULL); 963e14bb325SJeff Bonwick } 964e14bb325SJeff Bonwick } 965c717a561Smaybee 966e14bb325SJeff Bonwick /* 967e14bb325SJeff Bonwick * The final pass of spa_sync() must be all rewrites, but the first 968e14bb325SJeff Bonwick * few passes offer a trade-off: allocating blocks defers convergence, 969e14bb325SJeff Bonwick * but newly allocated blocks are sequential, so they can be written 970e14bb325SJeff Bonwick * to disk faster. Therefore, we allow the first few passes of 971e14bb325SJeff Bonwick * spa_sync() to allocate new blocks, but force rewrites after that. 972e14bb325SJeff Bonwick * There should only be a handful of blocks after pass 1 in any case. 973e14bb325SJeff Bonwick */ 974b24ab676SJeff Bonwick if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == psize && 975e14bb325SJeff Bonwick pass > SYNC_PASS_REWRITE) { 976b24ab676SJeff Bonwick ASSERT(psize != 0); 977b24ab676SJeff Bonwick enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; 978e14bb325SJeff Bonwick zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; 979e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_REWRITE; 980e14bb325SJeff Bonwick } else { 981e14bb325SJeff Bonwick BP_ZERO(bp); 982e14bb325SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 983e14bb325SJeff Bonwick } 984fa9e4066Sahrens 985b24ab676SJeff Bonwick if (psize == 0) { 986e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 987e14bb325SJeff Bonwick } else { 988e14bb325SJeff Bonwick ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); 989e14bb325SJeff Bonwick BP_SET_LSIZE(bp, lsize); 990b24ab676SJeff Bonwick BP_SET_PSIZE(bp, psize); 991e14bb325SJeff Bonwick BP_SET_COMPRESS(bp, compress); 992e14bb325SJeff Bonwick BP_SET_CHECKSUM(bp, zp->zp_checksum); 993e14bb325SJeff Bonwick BP_SET_TYPE(bp, zp->zp_type); 994e14bb325SJeff Bonwick BP_SET_LEVEL(bp, zp->zp_level); 995b24ab676SJeff Bonwick BP_SET_DEDUP(bp, zp->zp_dedup); 996e14bb325SJeff Bonwick BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 997b24ab676SJeff Bonwick if (zp->zp_dedup) { 998b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 999b24ab676SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 1000b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; 1001b24ab676SJeff Bonwick } 1002b24ab676SJeff Bonwick } 1003b24ab676SJeff Bonwick 1004b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1005b24ab676SJeff Bonwick } 1006b24ab676SJeff Bonwick 1007b24ab676SJeff Bonwick static int 1008b24ab676SJeff Bonwick zio_free_bp_init(zio_t *zio) 1009b24ab676SJeff Bonwick { 1010b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1011b24ab676SJeff Bonwick 1012b24ab676SJeff Bonwick if (zio->io_child_type == ZIO_CHILD_LOGICAL) { 1013b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp)) 1014b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; 1015b24ab676SJeff Bonwick else 1016b24ab676SJeff Bonwick arc_free(zio->io_spa, bp); 1017e14bb325SJeff Bonwick } 1018fa9e4066Sahrens 1019e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1020fa9e4066Sahrens } 1021fa9e4066Sahrens 1022e14bb325SJeff Bonwick /* 1023e14bb325SJeff Bonwick * ========================================================================== 1024e14bb325SJeff Bonwick * Execute the I/O pipeline 1025e14bb325SJeff Bonwick * ========================================================================== 1026e14bb325SJeff Bonwick */ 1027e14bb325SJeff Bonwick 1028e14bb325SJeff Bonwick static void 1029*35a5a358SJonathan Adams zio_taskq_dispatch(zio_t *zio, enum zio_taskq_type q, boolean_t cutinline) 1030fa9e4066Sahrens { 103180eb36f2SGeorge Wilson spa_t *spa = zio->io_spa; 1032e14bb325SJeff Bonwick zio_type_t t = zio->io_type; 1033*35a5a358SJonathan Adams int flags = TQ_SLEEP | (cutinline ? TQ_FRONT : 0); 10340a4e9518Sgw 10350a4e9518Sgw /* 1036bbe36defSGeorge Wilson * If we're a config writer or a probe, the normal issue and 1037bbe36defSGeorge Wilson * interrupt threads may all be blocked waiting for the config lock. 1038bbe36defSGeorge Wilson * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. 10390a4e9518Sgw */ 1040bbe36defSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) 1041e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 10420a4e9518Sgw 10430a4e9518Sgw /* 1044e14bb325SJeff Bonwick * A similar issue exists for the L2ARC write thread until L2ARC 2.0. 10450a4e9518Sgw */ 1046e14bb325SJeff Bonwick if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) 1047e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 10480a4e9518Sgw 104980eb36f2SGeorge Wilson /* 105080eb36f2SGeorge Wilson * If this is a high priority I/O, then use the high priority taskq. 105180eb36f2SGeorge Wilson */ 105280eb36f2SGeorge Wilson if (zio->io_priority == ZIO_PRIORITY_NOW && 105380eb36f2SGeorge Wilson spa->spa_zio_taskq[t][q + 1] != NULL) 105480eb36f2SGeorge Wilson q++; 105580eb36f2SGeorge Wilson 105680eb36f2SGeorge Wilson ASSERT3U(q, <, ZIO_TASKQ_TYPES); 105780eb36f2SGeorge Wilson (void) taskq_dispatch(spa->spa_zio_taskq[t][q], 1058*35a5a358SJonathan Adams (task_func_t *)zio_execute, zio, flags); 1059e14bb325SJeff Bonwick } 10600a4e9518Sgw 1061e14bb325SJeff Bonwick static boolean_t 1062e14bb325SJeff Bonwick zio_taskq_member(zio_t *zio, enum zio_taskq_type q) 1063e14bb325SJeff Bonwick { 1064e14bb325SJeff Bonwick kthread_t *executor = zio->io_executor; 1065e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 10660a4e9518Sgw 1067e14bb325SJeff Bonwick for (zio_type_t t = 0; t < ZIO_TYPES; t++) 1068e14bb325SJeff Bonwick if (taskq_member(spa->spa_zio_taskq[t][q], executor)) 1069e14bb325SJeff Bonwick return (B_TRUE); 10700a4e9518Sgw 1071e14bb325SJeff Bonwick return (B_FALSE); 1072e14bb325SJeff Bonwick } 1073e05725b1Sbonwick 1074e14bb325SJeff Bonwick static int 1075e14bb325SJeff Bonwick zio_issue_async(zio_t *zio) 1076e14bb325SJeff Bonwick { 1077*35a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 1078e14bb325SJeff Bonwick 1079e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 10800a4e9518Sgw } 10810a4e9518Sgw 1082e14bb325SJeff Bonwick void 1083e14bb325SJeff Bonwick zio_interrupt(zio_t *zio) 10840a4e9518Sgw { 1085*35a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE); 1086e14bb325SJeff Bonwick } 10870a4e9518Sgw 1088e14bb325SJeff Bonwick /* 1089e14bb325SJeff Bonwick * Execute the I/O pipeline until one of the following occurs: 1090e14bb325SJeff Bonwick * (1) the I/O completes; (2) the pipeline stalls waiting for 1091e14bb325SJeff Bonwick * dependent child I/Os; (3) the I/O issues, so we're waiting 1092e14bb325SJeff Bonwick * for an I/O completion interrupt; (4) the I/O is delegated by 1093e14bb325SJeff Bonwick * vdev-level caching or aggregation; (5) the I/O is deferred 1094e14bb325SJeff Bonwick * due to vdev-level queueing; (6) the I/O is handed off to 1095e14bb325SJeff Bonwick * another thread. In all cases, the pipeline stops whenever 1096e14bb325SJeff Bonwick * there's no CPU work; it never burns a thread in cv_wait(). 1097e14bb325SJeff Bonwick * 1098e14bb325SJeff Bonwick * There's no locking on io_stage because there's no legitimate way 1099e14bb325SJeff Bonwick * for multiple threads to be attempting to process the same I/O. 1100e14bb325SJeff Bonwick */ 1101b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[]; 11020a4e9518Sgw 1103e14bb325SJeff Bonwick void 1104e14bb325SJeff Bonwick zio_execute(zio_t *zio) 1105e14bb325SJeff Bonwick { 1106e14bb325SJeff Bonwick zio->io_executor = curthread; 11070a4e9518Sgw 1108e14bb325SJeff Bonwick while (zio->io_stage < ZIO_STAGE_DONE) { 1109b24ab676SJeff Bonwick enum zio_stage pipeline = zio->io_pipeline; 1110b24ab676SJeff Bonwick enum zio_stage stage = zio->io_stage; 1111e14bb325SJeff Bonwick int rv; 11120a4e9518Sgw 1113e14bb325SJeff Bonwick ASSERT(!MUTEX_HELD(&zio->io_lock)); 1114b24ab676SJeff Bonwick ASSERT(ISP2(stage)); 1115b24ab676SJeff Bonwick ASSERT(zio->io_stall == NULL); 11160a4e9518Sgw 1117b24ab676SJeff Bonwick do { 1118b24ab676SJeff Bonwick stage <<= 1; 1119b24ab676SJeff Bonwick } while ((stage & pipeline) == 0); 1120e14bb325SJeff Bonwick 1121e14bb325SJeff Bonwick ASSERT(stage <= ZIO_STAGE_DONE); 11220a4e9518Sgw 11230a4e9518Sgw /* 1124e14bb325SJeff Bonwick * If we are in interrupt context and this pipeline stage 1125e14bb325SJeff Bonwick * will grab a config lock that is held across I/O, 1126b24ab676SJeff Bonwick * or may wait for an I/O that needs an interrupt thread 1127b24ab676SJeff Bonwick * to complete, issue async to avoid deadlock. 1128*35a5a358SJonathan Adams * 1129*35a5a358SJonathan Adams * For VDEV_IO_START, we cut in line so that the io will 1130*35a5a358SJonathan Adams * be sent to disk promptly. 11310a4e9518Sgw */ 1132b24ab676SJeff Bonwick if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && 1133e14bb325SJeff Bonwick zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { 1134*35a5a358SJonathan Adams boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ? 1135*35a5a358SJonathan Adams zio_requeue_io_start_cut_in_line : B_FALSE; 1136*35a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); 1137e14bb325SJeff Bonwick return; 11380a4e9518Sgw } 11390a4e9518Sgw 1140e14bb325SJeff Bonwick zio->io_stage = stage; 1141b24ab676SJeff Bonwick rv = zio_pipeline[highbit(stage) - 1](zio); 11420a4e9518Sgw 1143e14bb325SJeff Bonwick if (rv == ZIO_PIPELINE_STOP) 1144e14bb325SJeff Bonwick return; 11450a4e9518Sgw 1146e14bb325SJeff Bonwick ASSERT(rv == ZIO_PIPELINE_CONTINUE); 1147e14bb325SJeff Bonwick } 11480a4e9518Sgw } 11490a4e9518Sgw 1150e14bb325SJeff Bonwick /* 1151e14bb325SJeff Bonwick * ========================================================================== 1152e14bb325SJeff Bonwick * Initiate I/O, either sync or async 1153e14bb325SJeff Bonwick * ========================================================================== 1154e14bb325SJeff Bonwick */ 1155e14bb325SJeff Bonwick int 1156e14bb325SJeff Bonwick zio_wait(zio_t *zio) 11570a4e9518Sgw { 1158e14bb325SJeff Bonwick int error; 11590a4e9518Sgw 1160e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 1161e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 11620a4e9518Sgw 1163e14bb325SJeff Bonwick zio->io_waiter = curthread; 1164e05725b1Sbonwick 1165e14bb325SJeff Bonwick zio_execute(zio); 11660a4e9518Sgw 1167e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 1168e14bb325SJeff Bonwick while (zio->io_executor != NULL) 1169e14bb325SJeff Bonwick cv_wait(&zio->io_cv, &zio->io_lock); 1170e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 117132b87932Sek 1172e14bb325SJeff Bonwick error = zio->io_error; 1173e14bb325SJeff Bonwick zio_destroy(zio); 117432b87932Sek 1175e14bb325SJeff Bonwick return (error); 117632b87932Sek } 117732b87932Sek 1178e14bb325SJeff Bonwick void 1179e14bb325SJeff Bonwick zio_nowait(zio_t *zio) 11800a4e9518Sgw { 1181e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 1182fa9e4066Sahrens 1183a3f829aeSBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL && 1184a3f829aeSBill Moore zio_unique_parent(zio) == NULL) { 1185ea8dc4b6Seschrock /* 1186e14bb325SJeff Bonwick * This is a logical async I/O with no parent to wait for it. 118754d692b7SGeorge Wilson * We add it to the spa_async_root_zio "Godfather" I/O which 118854d692b7SGeorge Wilson * will ensure they complete prior to unloading the pool. 1189ea8dc4b6Seschrock */ 1190e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 119154d692b7SGeorge Wilson 119254d692b7SGeorge Wilson zio_add_child(spa->spa_async_zio_root, zio); 1193e14bb325SJeff Bonwick } 1194ea8dc4b6Seschrock 1195e14bb325SJeff Bonwick zio_execute(zio); 1196e14bb325SJeff Bonwick } 1197ea8dc4b6Seschrock 1198e14bb325SJeff Bonwick /* 1199e14bb325SJeff Bonwick * ========================================================================== 1200e14bb325SJeff Bonwick * Reexecute or suspend/resume failed I/O 1201e14bb325SJeff Bonwick * ========================================================================== 1202e14bb325SJeff Bonwick */ 1203fa9e4066Sahrens 1204e14bb325SJeff Bonwick static void 1205e14bb325SJeff Bonwick zio_reexecute(zio_t *pio) 1206e14bb325SJeff Bonwick { 1207a3f829aeSBill Moore zio_t *cio, *cio_next; 1208a3f829aeSBill Moore 1209a3f829aeSBill Moore ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); 1210a3f829aeSBill Moore ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); 1211f5383399SBill Moore ASSERT(pio->io_gang_leader == NULL); 1212f5383399SBill Moore ASSERT(pio->io_gang_tree == NULL); 1213e05725b1Sbonwick 1214e14bb325SJeff Bonwick pio->io_flags = pio->io_orig_flags; 1215e14bb325SJeff Bonwick pio->io_stage = pio->io_orig_stage; 1216e14bb325SJeff Bonwick pio->io_pipeline = pio->io_orig_pipeline; 1217e14bb325SJeff Bonwick pio->io_reexecute = 0; 1218e14bb325SJeff Bonwick pio->io_error = 0; 1219a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1220a3f829aeSBill Moore pio->io_state[w] = 0; 1221e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 1222e14bb325SJeff Bonwick pio->io_child_error[c] = 0; 12230a4e9518Sgw 1224b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(pio)) 1225b24ab676SJeff Bonwick BP_ZERO(pio->io_bp); 1226d58459f4Sek 1227e14bb325SJeff Bonwick /* 1228e14bb325SJeff Bonwick * As we reexecute pio's children, new children could be created. 1229a3f829aeSBill Moore * New children go to the head of pio's io_child_list, however, 1230e14bb325SJeff Bonwick * so we will (correctly) not reexecute them. The key is that 1231a3f829aeSBill Moore * the remainder of pio's io_child_list, from 'cio_next' onward, 1232a3f829aeSBill Moore * cannot be affected by any side effects of reexecuting 'cio'. 1233e14bb325SJeff Bonwick */ 1234a3f829aeSBill Moore for (cio = zio_walk_children(pio); cio != NULL; cio = cio_next) { 1235a3f829aeSBill Moore cio_next = zio_walk_children(pio); 1236e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 1237a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1238a3f829aeSBill Moore pio->io_children[cio->io_child_type][w]++; 1239e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 1240a3f829aeSBill Moore zio_reexecute(cio); 1241fa9e4066Sahrens } 1242e05725b1Sbonwick 1243e14bb325SJeff Bonwick /* 1244e14bb325SJeff Bonwick * Now that all children have been reexecuted, execute the parent. 124554d692b7SGeorge Wilson * We don't reexecute "The Godfather" I/O here as it's the 124654d692b7SGeorge Wilson * responsibility of the caller to wait on him. 1247e14bb325SJeff Bonwick */ 124854d692b7SGeorge Wilson if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) 124954d692b7SGeorge Wilson zio_execute(pio); 12500a4e9518Sgw } 12510a4e9518Sgw 1252e14bb325SJeff Bonwick void 1253e14bb325SJeff Bonwick zio_suspend(spa_t *spa, zio_t *zio) 12540a4e9518Sgw { 1255e14bb325SJeff Bonwick if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) 1256e14bb325SJeff Bonwick fm_panic("Pool '%s' has encountered an uncorrectable I/O " 1257e14bb325SJeff Bonwick "failure and the failure mode property for this pool " 1258e14bb325SJeff Bonwick "is set to panic.", spa_name(spa)); 12590a4e9518Sgw 1260e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); 12610a4e9518Sgw 1262e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1263fa9e4066Sahrens 1264e14bb325SJeff Bonwick if (spa->spa_suspend_zio_root == NULL) 126554d692b7SGeorge Wilson spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, 126654d692b7SGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 126754d692b7SGeorge Wilson ZIO_FLAG_GODFATHER); 1268fa9e4066Sahrens 1269e14bb325SJeff Bonwick spa->spa_suspended = B_TRUE; 1270fa9e4066Sahrens 1271e14bb325SJeff Bonwick if (zio != NULL) { 127254d692b7SGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 1273e14bb325SJeff Bonwick ASSERT(zio != spa->spa_suspend_zio_root); 1274e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1275a3f829aeSBill Moore ASSERT(zio_unique_parent(zio) == NULL); 1276e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_DONE); 1277e14bb325SJeff Bonwick zio_add_child(spa->spa_suspend_zio_root, zio); 1278e14bb325SJeff Bonwick } 1279fa9e4066Sahrens 1280e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1281e14bb325SJeff Bonwick } 1282fa9e4066Sahrens 128354d692b7SGeorge Wilson int 1284e14bb325SJeff Bonwick zio_resume(spa_t *spa) 1285e14bb325SJeff Bonwick { 128654d692b7SGeorge Wilson zio_t *pio; 1287fa9e4066Sahrens 1288b3995adbSahrens /* 1289e14bb325SJeff Bonwick * Reexecute all previously suspended i/o. 1290b3995adbSahrens */ 1291e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1292e14bb325SJeff Bonwick spa->spa_suspended = B_FALSE; 1293e14bb325SJeff Bonwick cv_broadcast(&spa->spa_suspend_cv); 1294e14bb325SJeff Bonwick pio = spa->spa_suspend_zio_root; 1295e14bb325SJeff Bonwick spa->spa_suspend_zio_root = NULL; 1296e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1297e14bb325SJeff Bonwick 1298e14bb325SJeff Bonwick if (pio == NULL) 129954d692b7SGeorge Wilson return (0); 1300e14bb325SJeff Bonwick 130154d692b7SGeorge Wilson zio_reexecute(pio); 130254d692b7SGeorge Wilson return (zio_wait(pio)); 1303e14bb325SJeff Bonwick } 1304e14bb325SJeff Bonwick 1305e14bb325SJeff Bonwick void 1306e14bb325SJeff Bonwick zio_resume_wait(spa_t *spa) 1307e14bb325SJeff Bonwick { 1308e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1309e14bb325SJeff Bonwick while (spa_suspended(spa)) 1310e14bb325SJeff Bonwick cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); 1311e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1312fa9e4066Sahrens } 1313fa9e4066Sahrens 1314fa9e4066Sahrens /* 1315fa9e4066Sahrens * ========================================================================== 1316e14bb325SJeff Bonwick * Gang blocks. 1317e14bb325SJeff Bonwick * 1318e14bb325SJeff Bonwick * A gang block is a collection of small blocks that looks to the DMU 1319e14bb325SJeff Bonwick * like one large block. When zio_dva_allocate() cannot find a block 1320e14bb325SJeff Bonwick * of the requested size, due to either severe fragmentation or the pool 1321e14bb325SJeff Bonwick * being nearly full, it calls zio_write_gang_block() to construct the 1322e14bb325SJeff Bonwick * block from smaller fragments. 1323e14bb325SJeff Bonwick * 1324e14bb325SJeff Bonwick * A gang block consists of a gang header (zio_gbh_phys_t) and up to 1325e14bb325SJeff Bonwick * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like 1326e14bb325SJeff Bonwick * an indirect block: it's an array of block pointers. It consumes 1327e14bb325SJeff Bonwick * only one sector and hence is allocatable regardless of fragmentation. 1328e14bb325SJeff Bonwick * The gang header's bps point to its gang members, which hold the data. 1329e14bb325SJeff Bonwick * 1330e14bb325SJeff Bonwick * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> 1331e14bb325SJeff Bonwick * as the verifier to ensure uniqueness of the SHA256 checksum. 1332e14bb325SJeff Bonwick * Critically, the gang block bp's blk_cksum is the checksum of the data, 1333e14bb325SJeff Bonwick * not the gang header. This ensures that data block signatures (needed for 1334e14bb325SJeff Bonwick * deduplication) are independent of how the block is physically stored. 1335e14bb325SJeff Bonwick * 1336e14bb325SJeff Bonwick * Gang blocks can be nested: a gang member may itself be a gang block. 1337e14bb325SJeff Bonwick * Thus every gang block is a tree in which root and all interior nodes are 1338e14bb325SJeff Bonwick * gang headers, and the leaves are normal blocks that contain user data. 1339e14bb325SJeff Bonwick * The root of the gang tree is called the gang leader. 1340e14bb325SJeff Bonwick * 1341e14bb325SJeff Bonwick * To perform any operation (read, rewrite, free, claim) on a gang block, 1342e14bb325SJeff Bonwick * zio_gang_assemble() first assembles the gang tree (minus data leaves) 1343e14bb325SJeff Bonwick * in the io_gang_tree field of the original logical i/o by recursively 1344e14bb325SJeff Bonwick * reading the gang leader and all gang headers below it. This yields 1345e14bb325SJeff Bonwick * an in-core tree containing the contents of every gang header and the 1346e14bb325SJeff Bonwick * bps for every constituent of the gang block. 1347e14bb325SJeff Bonwick * 1348e14bb325SJeff Bonwick * With the gang tree now assembled, zio_gang_issue() just walks the gang tree 1349e14bb325SJeff Bonwick * and invokes a callback on each bp. To free a gang block, zio_gang_issue() 1350e14bb325SJeff Bonwick * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. 1351e14bb325SJeff Bonwick * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). 1352e14bb325SJeff Bonwick * zio_read_gang() is a wrapper around zio_read() that omits reading gang 1353e14bb325SJeff Bonwick * headers, since we already have those in io_gang_tree. zio_rewrite_gang() 1354e14bb325SJeff Bonwick * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() 1355e14bb325SJeff Bonwick * of the gang header plus zio_checksum_compute() of the data to update the 1356e14bb325SJeff Bonwick * gang header's blk_cksum as described above. 1357e14bb325SJeff Bonwick * 1358e14bb325SJeff Bonwick * The two-phase assemble/issue model solves the problem of partial failure -- 1359e14bb325SJeff Bonwick * what if you'd freed part of a gang block but then couldn't read the 1360e14bb325SJeff Bonwick * gang header for another part? Assembling the entire gang tree first 1361e14bb325SJeff Bonwick * ensures that all the necessary gang header I/O has succeeded before 1362e14bb325SJeff Bonwick * starting the actual work of free, claim, or write. Once the gang tree 1363e14bb325SJeff Bonwick * is assembled, free and claim are in-memory operations that cannot fail. 1364e14bb325SJeff Bonwick * 1365e14bb325SJeff Bonwick * In the event that a gang write fails, zio_dva_unallocate() walks the 1366e14bb325SJeff Bonwick * gang tree to immediately free (i.e. insert back into the space map) 1367e14bb325SJeff Bonwick * everything we've allocated. This ensures that we don't get ENOSPC 1368e14bb325SJeff Bonwick * errors during repeated suspend/resume cycles due to a flaky device. 1369e14bb325SJeff Bonwick * 1370e14bb325SJeff Bonwick * Gang rewrites only happen during sync-to-convergence. If we can't assemble 1371e14bb325SJeff Bonwick * the gang tree, we won't modify the block, so we can safely defer the free 1372e14bb325SJeff Bonwick * (knowing that the block is still intact). If we *can* assemble the gang 1373e14bb325SJeff Bonwick * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free 1374e14bb325SJeff Bonwick * each constituent bp and we can allocate a new block on the next sync pass. 1375e14bb325SJeff Bonwick * 1376e14bb325SJeff Bonwick * In all cases, the gang tree allows complete recovery from partial failure. 1377fa9e4066Sahrens * ========================================================================== 1378fa9e4066Sahrens */ 1379e14bb325SJeff Bonwick 1380e14bb325SJeff Bonwick static zio_t * 1381e14bb325SJeff Bonwick zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1382fa9e4066Sahrens { 1383e14bb325SJeff Bonwick if (gn != NULL) 1384e14bb325SJeff Bonwick return (pio); 1385fa9e4066Sahrens 1386e14bb325SJeff Bonwick return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), 1387e14bb325SJeff Bonwick NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1388e14bb325SJeff Bonwick &pio->io_bookmark)); 1389e14bb325SJeff Bonwick } 1390e14bb325SJeff Bonwick 1391e14bb325SJeff Bonwick zio_t * 1392e14bb325SJeff Bonwick zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1393e14bb325SJeff Bonwick { 1394e14bb325SJeff Bonwick zio_t *zio; 1395e14bb325SJeff Bonwick 1396e14bb325SJeff Bonwick if (gn != NULL) { 1397e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1398e14bb325SJeff Bonwick gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, 1399e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1400fa9e4066Sahrens /* 1401e14bb325SJeff Bonwick * As we rewrite each gang header, the pipeline will compute 1402e14bb325SJeff Bonwick * a new gang block header checksum for it; but no one will 1403e14bb325SJeff Bonwick * compute a new data checksum, so we do that here. The one 1404e14bb325SJeff Bonwick * exception is the gang leader: the pipeline already computed 1405e14bb325SJeff Bonwick * its data checksum because that stage precedes gang assembly. 1406e14bb325SJeff Bonwick * (Presently, nothing actually uses interior data checksums; 1407e14bb325SJeff Bonwick * this is just good hygiene.) 1408fa9e4066Sahrens */ 1409f5383399SBill Moore if (gn != pio->io_gang_leader->io_gang_tree) { 1410e14bb325SJeff Bonwick zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), 1411e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp)); 1412e14bb325SJeff Bonwick } 1413b24ab676SJeff Bonwick /* 1414b24ab676SJeff Bonwick * If we are here to damage data for testing purposes, 1415b24ab676SJeff Bonwick * leave the GBH alone so that we can detect the damage. 1416b24ab676SJeff Bonwick */ 1417b24ab676SJeff Bonwick if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) 1418b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 1419fa9e4066Sahrens } else { 1420e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1421e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, 1422e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1423fa9e4066Sahrens } 1424fa9e4066Sahrens 1425e14bb325SJeff Bonwick return (zio); 1426e14bb325SJeff Bonwick } 1427fa9e4066Sahrens 1428e14bb325SJeff Bonwick /* ARGSUSED */ 1429e14bb325SJeff Bonwick zio_t * 1430e14bb325SJeff Bonwick zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1431e14bb325SJeff Bonwick { 1432b24ab676SJeff Bonwick return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, 1433b24ab676SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio))); 1434fa9e4066Sahrens } 1435fa9e4066Sahrens 1436e14bb325SJeff Bonwick /* ARGSUSED */ 1437e14bb325SJeff Bonwick zio_t * 1438e14bb325SJeff Bonwick zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1439fa9e4066Sahrens { 1440e14bb325SJeff Bonwick return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, 1441e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 1442e14bb325SJeff Bonwick } 1443fa9e4066Sahrens 1444e14bb325SJeff Bonwick static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { 1445e14bb325SJeff Bonwick NULL, 1446e14bb325SJeff Bonwick zio_read_gang, 1447e14bb325SJeff Bonwick zio_rewrite_gang, 1448e14bb325SJeff Bonwick zio_free_gang, 1449e14bb325SJeff Bonwick zio_claim_gang, 1450e14bb325SJeff Bonwick NULL 1451e14bb325SJeff Bonwick }; 1452fa9e4066Sahrens 1453e14bb325SJeff Bonwick static void zio_gang_tree_assemble_done(zio_t *zio); 1454fa9e4066Sahrens 1455e14bb325SJeff Bonwick static zio_gang_node_t * 1456e14bb325SJeff Bonwick zio_gang_node_alloc(zio_gang_node_t **gnpp) 1457e14bb325SJeff Bonwick { 1458e14bb325SJeff Bonwick zio_gang_node_t *gn; 1459fa9e4066Sahrens 1460e14bb325SJeff Bonwick ASSERT(*gnpp == NULL); 1461fa9e4066Sahrens 1462e14bb325SJeff Bonwick gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); 1463e14bb325SJeff Bonwick gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); 1464e14bb325SJeff Bonwick *gnpp = gn; 1465e14bb325SJeff Bonwick 1466e14bb325SJeff Bonwick return (gn); 1467fa9e4066Sahrens } 1468fa9e4066Sahrens 1469fa9e4066Sahrens static void 1470e14bb325SJeff Bonwick zio_gang_node_free(zio_gang_node_t **gnpp) 1471fa9e4066Sahrens { 1472e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1473fa9e4066Sahrens 1474e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1475e14bb325SJeff Bonwick ASSERT(gn->gn_child[g] == NULL); 1476e14bb325SJeff Bonwick 1477e14bb325SJeff Bonwick zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); 1478e14bb325SJeff Bonwick kmem_free(gn, sizeof (*gn)); 1479e14bb325SJeff Bonwick *gnpp = NULL; 1480fa9e4066Sahrens } 1481fa9e4066Sahrens 1482e14bb325SJeff Bonwick static void 1483e14bb325SJeff Bonwick zio_gang_tree_free(zio_gang_node_t **gnpp) 1484fa9e4066Sahrens { 1485e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1486fa9e4066Sahrens 1487e14bb325SJeff Bonwick if (gn == NULL) 1488e14bb325SJeff Bonwick return; 1489fa9e4066Sahrens 1490e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1491e14bb325SJeff Bonwick zio_gang_tree_free(&gn->gn_child[g]); 1492fa9e4066Sahrens 1493e14bb325SJeff Bonwick zio_gang_node_free(gnpp); 1494fa9e4066Sahrens } 1495fa9e4066Sahrens 1496e14bb325SJeff Bonwick static void 1497f5383399SBill Moore zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) 1498fa9e4066Sahrens { 1499e14bb325SJeff Bonwick zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); 1500e14bb325SJeff Bonwick 1501f5383399SBill Moore ASSERT(gio->io_gang_leader == gio); 1502e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp)); 1503fa9e4066Sahrens 1504f5383399SBill Moore zio_nowait(zio_read(gio, gio->io_spa, bp, gn->gn_gbh, 1505e14bb325SJeff Bonwick SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, 1506f5383399SBill Moore gio->io_priority, ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); 1507e14bb325SJeff Bonwick } 1508fa9e4066Sahrens 1509e14bb325SJeff Bonwick static void 1510e14bb325SJeff Bonwick zio_gang_tree_assemble_done(zio_t *zio) 1511e14bb325SJeff Bonwick { 1512f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 1513e14bb325SJeff Bonwick zio_gang_node_t *gn = zio->io_private; 1514e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1515fa9e4066Sahrens 1516f5383399SBill Moore ASSERT(gio == zio_unique_parent(zio)); 1517b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 1518fa9e4066Sahrens 1519e14bb325SJeff Bonwick if (zio->io_error) 1520e14bb325SJeff Bonwick return; 1521fa9e4066Sahrens 1522e14bb325SJeff Bonwick if (BP_SHOULD_BYTESWAP(bp)) 1523e14bb325SJeff Bonwick byteswap_uint64_array(zio->io_data, zio->io_size); 1524fa9e4066Sahrens 1525e14bb325SJeff Bonwick ASSERT(zio->io_data == gn->gn_gbh); 1526e14bb325SJeff Bonwick ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); 1527e14bb325SJeff Bonwick ASSERT(gn->gn_gbh->zg_tail.zbt_magic == ZBT_MAGIC); 1528e05725b1Sbonwick 1529e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1530e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1531e14bb325SJeff Bonwick if (!BP_IS_GANG(gbp)) 1532e14bb325SJeff Bonwick continue; 1533f5383399SBill Moore zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); 1534e14bb325SJeff Bonwick } 1535fa9e4066Sahrens } 1536fa9e4066Sahrens 1537e14bb325SJeff Bonwick static void 1538e14bb325SJeff Bonwick zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) 1539fa9e4066Sahrens { 1540f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1541e14bb325SJeff Bonwick zio_t *zio; 1542fa9e4066Sahrens 1543e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) == !!gn); 1544f5383399SBill Moore ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); 1545f5383399SBill Moore ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); 1546fa9e4066Sahrens 1547e14bb325SJeff Bonwick /* 1548e14bb325SJeff Bonwick * If you're a gang header, your data is in gn->gn_gbh. 1549e14bb325SJeff Bonwick * If you're a gang member, your data is in 'data' and gn == NULL. 1550e14bb325SJeff Bonwick */ 1551f5383399SBill Moore zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data); 1552fa9e4066Sahrens 1553e14bb325SJeff Bonwick if (gn != NULL) { 1554e14bb325SJeff Bonwick ASSERT(gn->gn_gbh->zg_tail.zbt_magic == ZBT_MAGIC); 1555fa9e4066Sahrens 1556e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1557e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1558e14bb325SJeff Bonwick if (BP_IS_HOLE(gbp)) 1559e14bb325SJeff Bonwick continue; 1560e14bb325SJeff Bonwick zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); 1561e14bb325SJeff Bonwick data = (char *)data + BP_GET_PSIZE(gbp); 1562e14bb325SJeff Bonwick } 1563fa9e4066Sahrens } 1564fa9e4066Sahrens 1565f5383399SBill Moore if (gn == gio->io_gang_tree) 1566f5383399SBill Moore ASSERT3P((char *)gio->io_data + gio->io_size, ==, data); 1567e05725b1Sbonwick 1568e14bb325SJeff Bonwick if (zio != pio) 1569e14bb325SJeff Bonwick zio_nowait(zio); 1570fa9e4066Sahrens } 1571fa9e4066Sahrens 1572e05725b1Sbonwick static int 1573e14bb325SJeff Bonwick zio_gang_assemble(zio_t *zio) 1574fa9e4066Sahrens { 1575e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1576fa9e4066Sahrens 1577f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); 1578f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1579f5383399SBill Moore 1580f5383399SBill Moore zio->io_gang_leader = zio; 1581fa9e4066Sahrens 1582e14bb325SJeff Bonwick zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); 1583e05725b1Sbonwick 1584e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1585fa9e4066Sahrens } 1586fa9e4066Sahrens 1587e05725b1Sbonwick static int 1588e14bb325SJeff Bonwick zio_gang_issue(zio_t *zio) 1589fa9e4066Sahrens { 1590e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1591fa9e4066Sahrens 1592e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) 1593e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1594fa9e4066Sahrens 1595f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); 1596f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1597fa9e4066Sahrens 1598e14bb325SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_GANG] == 0) 1599f5383399SBill Moore zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_data); 1600e14bb325SJeff Bonwick else 1601f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 1602fa9e4066Sahrens 1603e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1604e05725b1Sbonwick 1605e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1606fa9e4066Sahrens } 1607fa9e4066Sahrens 1608fa9e4066Sahrens static void 1609e14bb325SJeff Bonwick zio_write_gang_member_ready(zio_t *zio) 1610fa9e4066Sahrens { 1611a3f829aeSBill Moore zio_t *pio = zio_unique_parent(zio); 1612f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 161344cd46caSbillm dva_t *cdva = zio->io_bp->blk_dva; 161444cd46caSbillm dva_t *pdva = pio->io_bp->blk_dva; 1615fa9e4066Sahrens uint64_t asize; 1616fa9e4066Sahrens 1617e14bb325SJeff Bonwick if (BP_IS_HOLE(zio->io_bp)) 1618e14bb325SJeff Bonwick return; 1619e14bb325SJeff Bonwick 1620e14bb325SJeff Bonwick ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); 1621e14bb325SJeff Bonwick 1622e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_GANG); 1623b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); 1624b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); 1625b24ab676SJeff Bonwick ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); 162644cd46caSbillm ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); 1627fa9e4066Sahrens 1628fa9e4066Sahrens mutex_enter(&pio->io_lock); 1629e14bb325SJeff Bonwick for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { 163044cd46caSbillm ASSERT(DVA_GET_GANG(&pdva[d])); 163144cd46caSbillm asize = DVA_GET_ASIZE(&pdva[d]); 163244cd46caSbillm asize += DVA_GET_ASIZE(&cdva[d]); 163344cd46caSbillm DVA_SET_ASIZE(&pdva[d], asize); 163444cd46caSbillm } 1635fa9e4066Sahrens mutex_exit(&pio->io_lock); 1636fa9e4066Sahrens } 1637fa9e4066Sahrens 16380a4e9518Sgw static int 1639e14bb325SJeff Bonwick zio_write_gang_block(zio_t *pio) 1640fa9e4066Sahrens { 1641e14bb325SJeff Bonwick spa_t *spa = pio->io_spa; 1642e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 1643f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1644e14bb325SJeff Bonwick zio_t *zio; 1645e14bb325SJeff Bonwick zio_gang_node_t *gn, **gnpp; 1646fa9e4066Sahrens zio_gbh_phys_t *gbh; 1647e14bb325SJeff Bonwick uint64_t txg = pio->io_txg; 1648e14bb325SJeff Bonwick uint64_t resid = pio->io_size; 1649e14bb325SJeff Bonwick uint64_t lsize; 1650b24ab676SJeff Bonwick int copies = gio->io_prop.zp_copies; 1651b24ab676SJeff Bonwick int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); 1652e14bb325SJeff Bonwick zio_prop_t zp; 1653fa9e4066Sahrens int error; 1654fa9e4066Sahrens 1655b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), SPA_GANGBLOCKSIZE, 1656b24ab676SJeff Bonwick bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, 1657e14bb325SJeff Bonwick METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); 1658e05725b1Sbonwick if (error) { 1659e14bb325SJeff Bonwick pio->io_error = error; 1660e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1661e05725b1Sbonwick } 1662fa9e4066Sahrens 1663f5383399SBill Moore if (pio == gio) { 1664f5383399SBill Moore gnpp = &gio->io_gang_tree; 1665e14bb325SJeff Bonwick } else { 1666e14bb325SJeff Bonwick gnpp = pio->io_private; 1667e14bb325SJeff Bonwick ASSERT(pio->io_ready == zio_write_gang_member_ready); 1668fa9e4066Sahrens } 1669fa9e4066Sahrens 1670e14bb325SJeff Bonwick gn = zio_gang_node_alloc(gnpp); 1671e14bb325SJeff Bonwick gbh = gn->gn_gbh; 1672e14bb325SJeff Bonwick bzero(gbh, SPA_GANGBLOCKSIZE); 1673fa9e4066Sahrens 1674e14bb325SJeff Bonwick /* 1675e14bb325SJeff Bonwick * Create the gang header. 1676e14bb325SJeff Bonwick */ 1677e14bb325SJeff Bonwick zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, 1678e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1679fa9e4066Sahrens 1680e14bb325SJeff Bonwick /* 1681e14bb325SJeff Bonwick * Create and nowait the gang children. 1682e14bb325SJeff Bonwick */ 1683e14bb325SJeff Bonwick for (int g = 0; resid != 0; resid -= lsize, g++) { 1684e14bb325SJeff Bonwick lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), 1685e14bb325SJeff Bonwick SPA_MINBLOCKSIZE); 1686e14bb325SJeff Bonwick ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); 1687e14bb325SJeff Bonwick 1688f5383399SBill Moore zp.zp_checksum = gio->io_prop.zp_checksum; 1689e14bb325SJeff Bonwick zp.zp_compress = ZIO_COMPRESS_OFF; 1690e14bb325SJeff Bonwick zp.zp_type = DMU_OT_NONE; 1691e14bb325SJeff Bonwick zp.zp_level = 0; 1692b24ab676SJeff Bonwick zp.zp_copies = gio->io_prop.zp_copies; 1693b24ab676SJeff Bonwick zp.zp_dedup = 0; 1694b24ab676SJeff Bonwick zp.zp_dedup_verify = 0; 1695e14bb325SJeff Bonwick 1696e14bb325SJeff Bonwick zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], 1697e14bb325SJeff Bonwick (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, 1698e14bb325SJeff Bonwick zio_write_gang_member_ready, NULL, &gn->gn_child[g], 1699e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1700e14bb325SJeff Bonwick &pio->io_bookmark)); 1701e14bb325SJeff Bonwick } 1702e05725b1Sbonwick 170344cd46caSbillm /* 1704e14bb325SJeff Bonwick * Set pio's pipeline to just wait for zio to finish. 170544cd46caSbillm */ 1706e14bb325SJeff Bonwick pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1707e14bb325SJeff Bonwick 1708e14bb325SJeff Bonwick zio_nowait(zio); 1709e14bb325SJeff Bonwick 1710e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1711fa9e4066Sahrens } 1712fa9e4066Sahrens 1713fa9e4066Sahrens /* 1714fa9e4066Sahrens * ========================================================================== 1715b24ab676SJeff Bonwick * Dedup 1716fa9e4066Sahrens * ========================================================================== 1717fa9e4066Sahrens */ 1718b24ab676SJeff Bonwick static void 1719b24ab676SJeff Bonwick zio_ddt_child_read_done(zio_t *zio) 1720b24ab676SJeff Bonwick { 1721b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1722b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1723b24ab676SJeff Bonwick ddt_phys_t *ddp; 1724b24ab676SJeff Bonwick zio_t *pio = zio_unique_parent(zio); 1725b24ab676SJeff Bonwick 1726b24ab676SJeff Bonwick mutex_enter(&pio->io_lock); 1727b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 1728b24ab676SJeff Bonwick if (zio->io_error == 0) 1729b24ab676SJeff Bonwick ddt_phys_clear(ddp); /* this ddp doesn't need repair */ 1730b24ab676SJeff Bonwick if (zio->io_error == 0 && dde->dde_repair_data == NULL) 1731b24ab676SJeff Bonwick dde->dde_repair_data = zio->io_data; 1732b24ab676SJeff Bonwick else 1733b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zio->io_size); 1734b24ab676SJeff Bonwick mutex_exit(&pio->io_lock); 1735b24ab676SJeff Bonwick } 1736b24ab676SJeff Bonwick 1737b24ab676SJeff Bonwick static int 1738b24ab676SJeff Bonwick zio_ddt_read_start(zio_t *zio) 1739b24ab676SJeff Bonwick { 1740b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1741b24ab676SJeff Bonwick 1742b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1743b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1744b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1745b24ab676SJeff Bonwick 1746b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1747b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1748b24ab676SJeff Bonwick ddt_entry_t *dde = ddt_repair_start(ddt, bp); 1749b24ab676SJeff Bonwick ddt_phys_t *ddp = dde->dde_phys; 1750b24ab676SJeff Bonwick ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); 1751b24ab676SJeff Bonwick blkptr_t blk; 1752b24ab676SJeff Bonwick 1753b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1754b24ab676SJeff Bonwick zio->io_vsd = dde; 1755b24ab676SJeff Bonwick 1756b24ab676SJeff Bonwick if (ddp_self == NULL) 1757b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1758b24ab676SJeff Bonwick 1759b24ab676SJeff Bonwick for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { 1760b24ab676SJeff Bonwick if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) 1761b24ab676SJeff Bonwick continue; 1762bbfd46c4SJeff Bonwick ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, 1763bbfd46c4SJeff Bonwick &blk); 1764b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, &blk, 1765b24ab676SJeff Bonwick zio_buf_alloc(zio->io_size), zio->io_size, 1766b24ab676SJeff Bonwick zio_ddt_child_read_done, dde, zio->io_priority, 1767b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio) | ZIO_FLAG_DONT_PROPAGATE, 1768b24ab676SJeff Bonwick &zio->io_bookmark)); 1769b24ab676SJeff Bonwick } 1770b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1771b24ab676SJeff Bonwick } 1772b24ab676SJeff Bonwick 1773b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, bp, 1774b24ab676SJeff Bonwick zio->io_data, zio->io_size, NULL, NULL, zio->io_priority, 1775b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); 1776b24ab676SJeff Bonwick 1777b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1778b24ab676SJeff Bonwick } 1779e14bb325SJeff Bonwick 1780b24ab676SJeff Bonwick static int 1781b24ab676SJeff Bonwick zio_ddt_read_done(zio_t *zio) 1782b24ab676SJeff Bonwick { 1783b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1784b24ab676SJeff Bonwick 1785b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE)) 1786b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 1787b24ab676SJeff Bonwick 1788b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1789b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1790b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1791b24ab676SJeff Bonwick 1792b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1793b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1794b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_vsd; 1795b24ab676SJeff Bonwick if (ddt == NULL) { 1796b16da2e2SGeorge Wilson ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE); 1797b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1798b24ab676SJeff Bonwick } 1799b24ab676SJeff Bonwick if (dde == NULL) { 1800b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; 1801*35a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 1802b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 1803b24ab676SJeff Bonwick } 1804b24ab676SJeff Bonwick if (dde->dde_repair_data != NULL) { 1805b24ab676SJeff Bonwick bcopy(dde->dde_repair_data, zio->io_data, zio->io_size); 1806b24ab676SJeff Bonwick zio->io_child_error[ZIO_CHILD_DDT] = 0; 1807b24ab676SJeff Bonwick } 1808b24ab676SJeff Bonwick ddt_repair_done(ddt, dde); 1809b24ab676SJeff Bonwick zio->io_vsd = NULL; 1810b24ab676SJeff Bonwick } 1811b24ab676SJeff Bonwick 1812b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1813b24ab676SJeff Bonwick 1814b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1815b24ab676SJeff Bonwick } 1816b24ab676SJeff Bonwick 1817b24ab676SJeff Bonwick static boolean_t 1818b24ab676SJeff Bonwick zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) 1819b24ab676SJeff Bonwick { 1820b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 1821b24ab676SJeff Bonwick 1822b24ab676SJeff Bonwick /* 1823b24ab676SJeff Bonwick * Note: we compare the original data, not the transformed data, 1824b24ab676SJeff Bonwick * because when zio->io_bp is an override bp, we will not have 1825b24ab676SJeff Bonwick * pushed the I/O transforms. That's an important optimization 1826b24ab676SJeff Bonwick * because otherwise we'd compress/encrypt all dmu_sync() data twice. 1827b24ab676SJeff Bonwick */ 1828b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 1829b24ab676SJeff Bonwick zio_t *lio = dde->dde_lead_zio[p]; 1830b24ab676SJeff Bonwick 1831b24ab676SJeff Bonwick if (lio != NULL) { 1832b24ab676SJeff Bonwick return (lio->io_orig_size != zio->io_orig_size || 1833b24ab676SJeff Bonwick bcmp(zio->io_orig_data, lio->io_orig_data, 1834b24ab676SJeff Bonwick zio->io_orig_size) != 0); 1835b24ab676SJeff Bonwick } 1836b24ab676SJeff Bonwick } 1837b24ab676SJeff Bonwick 1838b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 1839b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1840b24ab676SJeff Bonwick 1841b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) { 1842b24ab676SJeff Bonwick arc_buf_t *abuf = NULL; 1843b24ab676SJeff Bonwick uint32_t aflags = ARC_WAIT; 1844b24ab676SJeff Bonwick blkptr_t blk = *zio->io_bp; 1845b24ab676SJeff Bonwick int error; 1846b24ab676SJeff Bonwick 1847b24ab676SJeff Bonwick ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); 1848b24ab676SJeff Bonwick 1849b24ab676SJeff Bonwick ddt_exit(ddt); 1850b24ab676SJeff Bonwick 1851b24ab676SJeff Bonwick error = arc_read_nolock(NULL, spa, &blk, 1852b24ab676SJeff Bonwick arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, 1853b24ab676SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 1854b24ab676SJeff Bonwick &aflags, &zio->io_bookmark); 1855b24ab676SJeff Bonwick 1856b24ab676SJeff Bonwick if (error == 0) { 1857b24ab676SJeff Bonwick if (arc_buf_size(abuf) != zio->io_orig_size || 1858b24ab676SJeff Bonwick bcmp(abuf->b_data, zio->io_orig_data, 1859b24ab676SJeff Bonwick zio->io_orig_size) != 0) 1860b24ab676SJeff Bonwick error = EEXIST; 1861b24ab676SJeff Bonwick VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 1862b24ab676SJeff Bonwick } 1863b24ab676SJeff Bonwick 1864b24ab676SJeff Bonwick ddt_enter(ddt); 1865b24ab676SJeff Bonwick return (error != 0); 1866b24ab676SJeff Bonwick } 1867b24ab676SJeff Bonwick } 1868b24ab676SJeff Bonwick 1869b24ab676SJeff Bonwick return (B_FALSE); 1870b24ab676SJeff Bonwick } 1871b24ab676SJeff Bonwick 1872b24ab676SJeff Bonwick static void 1873b24ab676SJeff Bonwick zio_ddt_child_write_ready(zio_t *zio) 1874b24ab676SJeff Bonwick { 1875b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 1876b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 1877b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1878b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1879b24ab676SJeff Bonwick zio_t *pio; 1880b24ab676SJeff Bonwick 1881b24ab676SJeff Bonwick if (zio->io_error) 1882b24ab676SJeff Bonwick return; 1883b24ab676SJeff Bonwick 1884b24ab676SJeff Bonwick ddt_enter(ddt); 1885b24ab676SJeff Bonwick 1886b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1887b24ab676SJeff Bonwick 1888b24ab676SJeff Bonwick ddt_phys_fill(ddp, zio->io_bp); 1889b24ab676SJeff Bonwick 1890b24ab676SJeff Bonwick while ((pio = zio_walk_parents(zio)) != NULL) 1891b24ab676SJeff Bonwick ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); 1892b24ab676SJeff Bonwick 1893b24ab676SJeff Bonwick ddt_exit(ddt); 1894b24ab676SJeff Bonwick } 1895b24ab676SJeff Bonwick 1896b24ab676SJeff Bonwick static void 1897b24ab676SJeff Bonwick zio_ddt_child_write_done(zio_t *zio) 1898b24ab676SJeff Bonwick { 1899b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 1900b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 1901b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1902b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1903b24ab676SJeff Bonwick 1904b24ab676SJeff Bonwick ddt_enter(ddt); 1905b24ab676SJeff Bonwick 1906b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 1907b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1908b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 1909b24ab676SJeff Bonwick 1910b24ab676SJeff Bonwick if (zio->io_error == 0) { 1911b24ab676SJeff Bonwick while (zio_walk_parents(zio) != NULL) 1912b24ab676SJeff Bonwick ddt_phys_addref(ddp); 1913b24ab676SJeff Bonwick } else { 1914b24ab676SJeff Bonwick ddt_phys_clear(ddp); 1915b24ab676SJeff Bonwick } 1916b24ab676SJeff Bonwick 1917b24ab676SJeff Bonwick ddt_exit(ddt); 1918b24ab676SJeff Bonwick } 1919b24ab676SJeff Bonwick 1920b24ab676SJeff Bonwick static void 1921b24ab676SJeff Bonwick zio_ddt_ditto_write_done(zio_t *zio) 1922b24ab676SJeff Bonwick { 1923b24ab676SJeff Bonwick int p = DDT_PHYS_DITTO; 1924b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 1925b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1926b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1927b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1928b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1929b24ab676SJeff Bonwick ddt_key_t *ddk = &dde->dde_key; 1930b24ab676SJeff Bonwick 1931b24ab676SJeff Bonwick ddt_enter(ddt); 1932b24ab676SJeff Bonwick 1933b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 1934b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1935b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 1936b24ab676SJeff Bonwick 1937b24ab676SJeff Bonwick if (zio->io_error == 0) { 1938b24ab676SJeff Bonwick ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); 1939b24ab676SJeff Bonwick ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); 1940b24ab676SJeff Bonwick ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); 1941b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 1942b24ab676SJeff Bonwick ddt_phys_free(ddt, ddk, ddp, zio->io_txg); 1943b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 1944b24ab676SJeff Bonwick } 1945b24ab676SJeff Bonwick 1946b24ab676SJeff Bonwick ddt_exit(ddt); 1947b24ab676SJeff Bonwick } 1948b24ab676SJeff Bonwick 1949b24ab676SJeff Bonwick static int 1950b24ab676SJeff Bonwick zio_ddt_write(zio_t *zio) 1951b24ab676SJeff Bonwick { 1952b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 1953b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1954b24ab676SJeff Bonwick uint64_t txg = zio->io_txg; 1955b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 1956b24ab676SJeff Bonwick int p = zp->zp_copies; 1957b24ab676SJeff Bonwick int ditto_copies; 1958b24ab676SJeff Bonwick zio_t *cio = NULL; 1959b24ab676SJeff Bonwick zio_t *dio = NULL; 1960b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 1961b24ab676SJeff Bonwick ddt_entry_t *dde; 1962b24ab676SJeff Bonwick ddt_phys_t *ddp; 1963b24ab676SJeff Bonwick 1964b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1965b24ab676SJeff Bonwick ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); 1966b24ab676SJeff Bonwick ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); 1967b24ab676SJeff Bonwick 1968b24ab676SJeff Bonwick ddt_enter(ddt); 1969b24ab676SJeff Bonwick dde = ddt_lookup(ddt, bp, B_TRUE); 1970b24ab676SJeff Bonwick ddp = &dde->dde_phys[p]; 1971b24ab676SJeff Bonwick 1972b24ab676SJeff Bonwick if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { 1973b24ab676SJeff Bonwick /* 1974b24ab676SJeff Bonwick * If we're using a weak checksum, upgrade to a strong checksum 1975b24ab676SJeff Bonwick * and try again. If we're already using a strong checksum, 1976b24ab676SJeff Bonwick * we can't resolve it, so just convert to an ordinary write. 1977b24ab676SJeff Bonwick * (And automatically e-mail a paper to Nature?) 1978b24ab676SJeff Bonwick */ 1979b24ab676SJeff Bonwick if (!zio_checksum_table[zp->zp_checksum].ci_dedup) { 1980b24ab676SJeff Bonwick zp->zp_checksum = spa_dedup_checksum(spa); 1981b24ab676SJeff Bonwick zio_pop_transforms(zio); 1982b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 1983b24ab676SJeff Bonwick BP_ZERO(bp); 1984b24ab676SJeff Bonwick } else { 1985b24ab676SJeff Bonwick zp->zp_dedup = 0; 1986b24ab676SJeff Bonwick } 1987b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 1988b24ab676SJeff Bonwick ddt_exit(ddt); 1989b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1990b24ab676SJeff Bonwick } 1991b24ab676SJeff Bonwick 1992b24ab676SJeff Bonwick ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); 1993b24ab676SJeff Bonwick ASSERT(ditto_copies < SPA_DVAS_PER_BP); 1994b24ab676SJeff Bonwick 1995b24ab676SJeff Bonwick if (ditto_copies > ddt_ditto_copies_present(dde) && 1996b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { 1997b24ab676SJeff Bonwick zio_prop_t czp = *zp; 1998b24ab676SJeff Bonwick 1999b24ab676SJeff Bonwick czp.zp_copies = ditto_copies; 2000b24ab676SJeff Bonwick 2001b24ab676SJeff Bonwick /* 2002b24ab676SJeff Bonwick * If we arrived here with an override bp, we won't have run 2003b24ab676SJeff Bonwick * the transform stack, so we won't have the data we need to 2004b24ab676SJeff Bonwick * generate a child i/o. So, toss the override bp and restart. 2005b24ab676SJeff Bonwick * This is safe, because using the override bp is just an 2006b24ab676SJeff Bonwick * optimization; and it's rare, so the cost doesn't matter. 2007b24ab676SJeff Bonwick */ 2008b24ab676SJeff Bonwick if (zio->io_bp_override) { 2009b24ab676SJeff Bonwick zio_pop_transforms(zio); 2010b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2011b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2012b24ab676SJeff Bonwick zio->io_bp_override = NULL; 2013b24ab676SJeff Bonwick BP_ZERO(bp); 2014b24ab676SJeff Bonwick ddt_exit(ddt); 2015b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2016b24ab676SJeff Bonwick } 2017b24ab676SJeff Bonwick 2018b24ab676SJeff Bonwick dio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 2019b24ab676SJeff Bonwick zio->io_orig_size, &czp, NULL, 2020b24ab676SJeff Bonwick zio_ddt_ditto_write_done, dde, zio->io_priority, 2021b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2022b24ab676SJeff Bonwick 2023b24ab676SJeff Bonwick zio_push_transform(dio, zio->io_data, zio->io_size, 0, NULL); 2024b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; 2025b24ab676SJeff Bonwick } 2026b24ab676SJeff Bonwick 2027b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { 2028b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2029b24ab676SJeff Bonwick ddt_bp_fill(ddp, bp, txg); 2030b24ab676SJeff Bonwick if (dde->dde_lead_zio[p] != NULL) 2031b24ab676SJeff Bonwick zio_add_child(zio, dde->dde_lead_zio[p]); 2032b24ab676SJeff Bonwick else 2033b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2034b24ab676SJeff Bonwick } else if (zio->io_bp_override) { 2035b24ab676SJeff Bonwick ASSERT(bp->blk_birth == txg); 2036b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, zio->io_bp_override)); 2037b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2038b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2039b24ab676SJeff Bonwick } else { 2040b24ab676SJeff Bonwick cio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 2041b24ab676SJeff Bonwick zio->io_orig_size, zp, zio_ddt_child_write_ready, 2042b24ab676SJeff Bonwick zio_ddt_child_write_done, dde, zio->io_priority, 2043b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2044b24ab676SJeff Bonwick 2045b24ab676SJeff Bonwick zio_push_transform(cio, zio->io_data, zio->io_size, 0, NULL); 2046b24ab676SJeff Bonwick dde->dde_lead_zio[p] = cio; 2047b24ab676SJeff Bonwick } 2048b24ab676SJeff Bonwick 2049b24ab676SJeff Bonwick ddt_exit(ddt); 2050b24ab676SJeff Bonwick 2051b24ab676SJeff Bonwick if (cio) 2052b24ab676SJeff Bonwick zio_nowait(cio); 2053b24ab676SJeff Bonwick if (dio) 2054b24ab676SJeff Bonwick zio_nowait(dio); 2055b24ab676SJeff Bonwick 2056b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2057b24ab676SJeff Bonwick } 2058b24ab676SJeff Bonwick 2059b24ab676SJeff Bonwick static int 2060b24ab676SJeff Bonwick zio_ddt_free(zio_t *zio) 2061b24ab676SJeff Bonwick { 2062b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2063b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2064b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2065b24ab676SJeff Bonwick ddt_entry_t *dde; 2066b24ab676SJeff Bonwick ddt_phys_t *ddp; 2067b24ab676SJeff Bonwick 2068b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2069b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2070b24ab676SJeff Bonwick 2071b24ab676SJeff Bonwick ddt_enter(ddt); 2072b24ab676SJeff Bonwick dde = ddt_lookup(ddt, bp, B_TRUE); 2073b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 2074b24ab676SJeff Bonwick ddt_phys_decref(ddp); 2075b24ab676SJeff Bonwick ddt_exit(ddt); 2076b24ab676SJeff Bonwick 2077b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2078b24ab676SJeff Bonwick } 2079b24ab676SJeff Bonwick 2080b24ab676SJeff Bonwick /* 2081b24ab676SJeff Bonwick * ========================================================================== 2082b24ab676SJeff Bonwick * Allocate and free blocks 2083b24ab676SJeff Bonwick * ========================================================================== 2084b24ab676SJeff Bonwick */ 2085e05725b1Sbonwick static int 2086fa9e4066Sahrens zio_dva_allocate(zio_t *zio) 2087fa9e4066Sahrens { 20888654d025Sperrin spa_t *spa = zio->io_spa; 2089b24ab676SJeff Bonwick metaslab_class_t *mc = spa_normal_class(spa); 2090fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2091fa9e4066Sahrens int error; 2092fa9e4066Sahrens 2093f5383399SBill Moore if (zio->io_gang_leader == NULL) { 2094f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 2095f5383399SBill Moore zio->io_gang_leader = zio; 2096f5383399SBill Moore } 2097f5383399SBill Moore 2098fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 209944cd46caSbillm ASSERT3U(BP_GET_NDVAS(bp), ==, 0); 2100b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, >, 0); 2101b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); 2102fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 2103fa9e4066Sahrens 2104e14bb325SJeff Bonwick error = metaslab_alloc(spa, mc, zio->io_size, bp, 2105b24ab676SJeff Bonwick zio->io_prop.zp_copies, zio->io_txg, NULL, 0); 2106fa9e4066Sahrens 2107e14bb325SJeff Bonwick if (error) { 2108e14bb325SJeff Bonwick if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) 2109e14bb325SJeff Bonwick return (zio_write_gang_block(zio)); 2110fa9e4066Sahrens zio->io_error = error; 2111fa9e4066Sahrens } 2112e05725b1Sbonwick 2113e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2114fa9e4066Sahrens } 2115fa9e4066Sahrens 2116e05725b1Sbonwick static int 2117fa9e4066Sahrens zio_dva_free(zio_t *zio) 2118fa9e4066Sahrens { 2119e14bb325SJeff Bonwick metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); 2120fa9e4066Sahrens 2121e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2122fa9e4066Sahrens } 2123fa9e4066Sahrens 2124e05725b1Sbonwick static int 2125fa9e4066Sahrens zio_dva_claim(zio_t *zio) 2126fa9e4066Sahrens { 2127e14bb325SJeff Bonwick int error; 2128e14bb325SJeff Bonwick 2129e14bb325SJeff Bonwick error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); 2130e14bb325SJeff Bonwick if (error) 2131e14bb325SJeff Bonwick zio->io_error = error; 2132fa9e4066Sahrens 2133e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2134fa9e4066Sahrens } 2135fa9e4066Sahrens 2136e14bb325SJeff Bonwick /* 2137e14bb325SJeff Bonwick * Undo an allocation. This is used by zio_done() when an I/O fails 2138e14bb325SJeff Bonwick * and we want to give back the block we just allocated. 2139e14bb325SJeff Bonwick * This handles both normal blocks and gang blocks. 2140e14bb325SJeff Bonwick */ 2141e14bb325SJeff Bonwick static void 2142e14bb325SJeff Bonwick zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) 2143e14bb325SJeff Bonwick { 2144e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2145b24ab676SJeff Bonwick ASSERT(zio->io_bp_override == NULL); 2146e14bb325SJeff Bonwick 2147e14bb325SJeff Bonwick if (!BP_IS_HOLE(bp)) 2148b24ab676SJeff Bonwick metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); 2149e14bb325SJeff Bonwick 2150e14bb325SJeff Bonwick if (gn != NULL) { 2151e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 2152e14bb325SJeff Bonwick zio_dva_unallocate(zio, gn->gn_child[g], 2153e14bb325SJeff Bonwick &gn->gn_gbh->zg_blkptr[g]); 2154e14bb325SJeff Bonwick } 2155e14bb325SJeff Bonwick } 2156e14bb325SJeff Bonwick } 2157e14bb325SJeff Bonwick 2158e14bb325SJeff Bonwick /* 2159e14bb325SJeff Bonwick * Try to allocate an intent log block. Return 0 on success, errno on failure. 2160e14bb325SJeff Bonwick */ 2161e14bb325SJeff Bonwick int 2162b24ab676SJeff Bonwick zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, blkptr_t *old_bp, 2163b24ab676SJeff Bonwick uint64_t size, boolean_t use_slog) 2164e14bb325SJeff Bonwick { 2165e09fa4daSNeil Perrin int error = 1; 2166e14bb325SJeff Bonwick 2167b24ab676SJeff Bonwick ASSERT(txg > spa_syncing_txg(spa)); 2168b24ab676SJeff Bonwick 2169d48e086fSNeil Perrin if (use_slog) 2170b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_log_class(spa), size, 2171e09fa4daSNeil Perrin new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); 2172e14bb325SJeff Bonwick 2173e14bb325SJeff Bonwick if (error) 2174b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), size, 2175e14bb325SJeff Bonwick new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); 2176e14bb325SJeff Bonwick 2177e14bb325SJeff Bonwick if (error == 0) { 2178e14bb325SJeff Bonwick BP_SET_LSIZE(new_bp, size); 2179e14bb325SJeff Bonwick BP_SET_PSIZE(new_bp, size); 2180e14bb325SJeff Bonwick BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); 2181e14bb325SJeff Bonwick BP_SET_CHECKSUM(new_bp, ZIO_CHECKSUM_ZILOG); 2182e14bb325SJeff Bonwick BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 2183e14bb325SJeff Bonwick BP_SET_LEVEL(new_bp, 0); 2184b24ab676SJeff Bonwick BP_SET_DEDUP(new_bp, 0); 2185e14bb325SJeff Bonwick BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); 2186e14bb325SJeff Bonwick } 2187e14bb325SJeff Bonwick 2188e14bb325SJeff Bonwick return (error); 2189e14bb325SJeff Bonwick } 2190e14bb325SJeff Bonwick 2191e14bb325SJeff Bonwick /* 2192b24ab676SJeff Bonwick * Free an intent log block. 2193e14bb325SJeff Bonwick */ 2194e14bb325SJeff Bonwick void 2195b24ab676SJeff Bonwick zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp) 2196e14bb325SJeff Bonwick { 2197b24ab676SJeff Bonwick ASSERT(BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG); 2198e14bb325SJeff Bonwick ASSERT(!BP_IS_GANG(bp)); 2199e14bb325SJeff Bonwick 2200b24ab676SJeff Bonwick zio_free(spa, txg, bp); 2201e14bb325SJeff Bonwick } 2202e14bb325SJeff Bonwick 2203fa9e4066Sahrens /* 2204fa9e4066Sahrens * ========================================================================== 2205fa9e4066Sahrens * Read and write to physical devices 2206fa9e4066Sahrens * ========================================================================== 2207fa9e4066Sahrens */ 2208e05725b1Sbonwick static int 220944cd46caSbillm zio_vdev_io_start(zio_t *zio) 2210fa9e4066Sahrens { 2211fa9e4066Sahrens vdev_t *vd = zio->io_vd; 221244cd46caSbillm uint64_t align; 22130a4e9518Sgw spa_t *spa = zio->io_spa; 22140a4e9518Sgw 2215e14bb325SJeff Bonwick ASSERT(zio->io_error == 0); 2216e14bb325SJeff Bonwick ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); 2217fa9e4066Sahrens 2218e14bb325SJeff Bonwick if (vd == NULL) { 2219e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2220e14bb325SJeff Bonwick spa_config_enter(spa, SCL_ZIO, zio, RW_READER); 2221fa9e4066Sahrens 2222e14bb325SJeff Bonwick /* 2223e14bb325SJeff Bonwick * The mirror_ops handle multiple DVAs in a single BP. 2224e14bb325SJeff Bonwick */ 2225e14bb325SJeff Bonwick return (vdev_mirror_ops.vdev_op_io_start(zio)); 2226fa9e4066Sahrens } 2227fa9e4066Sahrens 2228e14bb325SJeff Bonwick align = 1ULL << vd->vdev_top->vdev_ashift; 2229e14bb325SJeff Bonwick 2230ecc2d604Sbonwick if (P2PHASE(zio->io_size, align) != 0) { 2231ecc2d604Sbonwick uint64_t asize = P2ROUNDUP(zio->io_size, align); 2232ecc2d604Sbonwick char *abuf = zio_buf_alloc(asize); 2233e14bb325SJeff Bonwick ASSERT(vd == vd->vdev_top); 2234ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_WRITE) { 2235ecc2d604Sbonwick bcopy(zio->io_data, abuf, zio->io_size); 2236ecc2d604Sbonwick bzero(abuf + zio->io_size, asize - zio->io_size); 2237ecc2d604Sbonwick } 2238e14bb325SJeff Bonwick zio_push_transform(zio, abuf, asize, asize, zio_subblock); 2239ecc2d604Sbonwick } 2240ecc2d604Sbonwick 2241ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_offset, align) == 0); 2242ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_size, align) == 0); 22438ad4d6ddSJeff Bonwick ASSERT(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); 22448ad4d6ddSJeff Bonwick 22458ad4d6ddSJeff Bonwick /* 22468ad4d6ddSJeff Bonwick * If this is a repair I/O, and there's no self-healing involved -- 22478ad4d6ddSJeff Bonwick * that is, we're just resilvering what we expect to resilver -- 22488ad4d6ddSJeff Bonwick * then don't do the I/O unless zio's txg is actually in vd's DTL. 22498ad4d6ddSJeff Bonwick * This prevents spurious resilvering with nested replication. 22508ad4d6ddSJeff Bonwick * For example, given a mirror of mirrors, (A+B)+(C+D), if only 22518ad4d6ddSJeff Bonwick * A is out of date, we'll read from C+D, then use the data to 22528ad4d6ddSJeff Bonwick * resilver A+B -- but we don't actually want to resilver B, just A. 22538ad4d6ddSJeff Bonwick * The top-level mirror has no way to know this, so instead we just 22548ad4d6ddSJeff Bonwick * discard unnecessary repairs as we work our way down the vdev tree. 22558ad4d6ddSJeff Bonwick * The same logic applies to any form of nested replication: 22568ad4d6ddSJeff Bonwick * ditto + mirror, RAID-Z + replacing, etc. This covers them all. 22578ad4d6ddSJeff Bonwick */ 22588ad4d6ddSJeff Bonwick if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && 22598ad4d6ddSJeff Bonwick !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && 22608ad4d6ddSJeff Bonwick zio->io_txg != 0 && /* not a delegated i/o */ 22618ad4d6ddSJeff Bonwick !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { 22628ad4d6ddSJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 22638ad4d6ddSJeff Bonwick zio_vdev_io_bypass(zio); 22648ad4d6ddSJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 22658ad4d6ddSJeff Bonwick } 2266fa9e4066Sahrens 2267e14bb325SJeff Bonwick if (vd->vdev_ops->vdev_op_leaf && 2268e14bb325SJeff Bonwick (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { 2269e14bb325SJeff Bonwick 2270e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) 2271a3f829aeSBill Moore return (ZIO_PIPELINE_CONTINUE); 2272e14bb325SJeff Bonwick 2273e14bb325SJeff Bonwick if ((zio = vdev_queue_io(zio)) == NULL) 2274e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2275e14bb325SJeff Bonwick 2276e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2277e14bb325SJeff Bonwick zio->io_error = ENXIO; 2278e14bb325SJeff Bonwick zio_interrupt(zio); 2279e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2280e14bb325SJeff Bonwick } 2281e14bb325SJeff Bonwick } 2282e14bb325SJeff Bonwick 2283e05725b1Sbonwick return (vd->vdev_ops->vdev_op_io_start(zio)); 2284fa9e4066Sahrens } 2285fa9e4066Sahrens 2286e05725b1Sbonwick static int 2287fa9e4066Sahrens zio_vdev_io_done(zio_t *zio) 2288fa9e4066Sahrens { 2289e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2290e14bb325SJeff Bonwick vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; 2291e14bb325SJeff Bonwick boolean_t unexpected_error = B_FALSE; 2292e05725b1Sbonwick 2293e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2294e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2295fa9e4066Sahrens 2296e14bb325SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); 2297e14bb325SJeff Bonwick 2298e14bb325SJeff Bonwick if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { 2299e14bb325SJeff Bonwick 2300e14bb325SJeff Bonwick vdev_queue_io_done(zio); 2301fa9e4066Sahrens 2302e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE) 2303e14bb325SJeff Bonwick vdev_cache_write(zio); 2304e14bb325SJeff Bonwick 2305e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 23068956713aSEric Schrock zio->io_error = zio_handle_device_injection(vd, 23078956713aSEric Schrock zio, EIO); 2308e14bb325SJeff Bonwick 2309e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2310e14bb325SJeff Bonwick zio->io_error = zio_handle_label_injection(zio, EIO); 2311e14bb325SJeff Bonwick 2312e14bb325SJeff Bonwick if (zio->io_error) { 2313e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2314e14bb325SJeff Bonwick zio->io_error = ENXIO; 2315e14bb325SJeff Bonwick } else { 2316e14bb325SJeff Bonwick unexpected_error = B_TRUE; 2317e14bb325SJeff Bonwick } 2318e14bb325SJeff Bonwick } 231951ece835Seschrock } 2320fa9e4066Sahrens 2321e14bb325SJeff Bonwick ops->vdev_op_io_done(zio); 2322e14bb325SJeff Bonwick 2323e14bb325SJeff Bonwick if (unexpected_error) 2324a3f829aeSBill Moore VERIFY(vdev_probe(vd, zio) == NULL); 2325e14bb325SJeff Bonwick 2326e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2327fa9e4066Sahrens } 2328fa9e4066Sahrens 232922fe2c88SJonathan Adams /* 233022fe2c88SJonathan Adams * For non-raidz ZIOs, we can just copy aside the bad data read from the 233122fe2c88SJonathan Adams * disk, and use that to finish the checksum ereport later. 233222fe2c88SJonathan Adams */ 233322fe2c88SJonathan Adams static void 233422fe2c88SJonathan Adams zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, 233522fe2c88SJonathan Adams const void *good_buf) 233622fe2c88SJonathan Adams { 233722fe2c88SJonathan Adams /* no processing needed */ 233822fe2c88SJonathan Adams zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); 233922fe2c88SJonathan Adams } 234022fe2c88SJonathan Adams 234122fe2c88SJonathan Adams /*ARGSUSED*/ 234222fe2c88SJonathan Adams void 234322fe2c88SJonathan Adams zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) 234422fe2c88SJonathan Adams { 234522fe2c88SJonathan Adams void *buf = zio_buf_alloc(zio->io_size); 234622fe2c88SJonathan Adams 234722fe2c88SJonathan Adams bcopy(zio->io_data, buf, zio->io_size); 234822fe2c88SJonathan Adams 234922fe2c88SJonathan Adams zcr->zcr_cbinfo = zio->io_size; 235022fe2c88SJonathan Adams zcr->zcr_cbdata = buf; 235122fe2c88SJonathan Adams zcr->zcr_finish = zio_vsd_default_cksum_finish; 235222fe2c88SJonathan Adams zcr->zcr_free = zio_buf_free; 235322fe2c88SJonathan Adams } 235422fe2c88SJonathan Adams 2355e05725b1Sbonwick static int 2356fa9e4066Sahrens zio_vdev_io_assess(zio_t *zio) 2357fa9e4066Sahrens { 2358fa9e4066Sahrens vdev_t *vd = zio->io_vd; 2359e14bb325SJeff Bonwick 2360e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2361e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2362e14bb325SJeff Bonwick 2363e14bb325SJeff Bonwick if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2364e14bb325SJeff Bonwick spa_config_exit(zio->io_spa, SCL_ZIO, zio); 2365e14bb325SJeff Bonwick 2366e14bb325SJeff Bonwick if (zio->io_vsd != NULL) { 236722fe2c88SJonathan Adams zio->io_vsd_ops->vsd_free(zio); 2368e14bb325SJeff Bonwick zio->io_vsd = NULL; 2369ecc2d604Sbonwick } 2370ecc2d604Sbonwick 2371e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2372ea8dc4b6Seschrock zio->io_error = zio_handle_fault_injection(zio, EIO); 2373ea8dc4b6Seschrock 2374fa9e4066Sahrens /* 2375fa9e4066Sahrens * If the I/O failed, determine whether we should attempt to retry it. 2376*35a5a358SJonathan Adams * 2377*35a5a358SJonathan Adams * On retry, we cut in line in the issue queue, since we don't want 2378*35a5a358SJonathan Adams * compression/checksumming/etc. work to prevent our (cheap) IO reissue. 2379fa9e4066Sahrens */ 2380e14bb325SJeff Bonwick if (zio->io_error && vd == NULL && 2381e14bb325SJeff Bonwick !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { 2382e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ 2383e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ 2384fa9e4066Sahrens zio->io_error = 0; 2385e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_RETRY | 2386e14bb325SJeff Bonwick ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; 2387b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; 2388*35a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, 2389*35a5a358SJonathan Adams zio_requeue_io_start_cut_in_line); 2390e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2391ea8dc4b6Seschrock } 2392fa9e4066Sahrens 2393e14bb325SJeff Bonwick /* 2394e14bb325SJeff Bonwick * If we got an error on a leaf device, convert it to ENXIO 2395e14bb325SJeff Bonwick * if the device is not accessible at all. 2396e14bb325SJeff Bonwick */ 2397e14bb325SJeff Bonwick if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && 2398e14bb325SJeff Bonwick !vdev_accessible(vd, zio)) 2399e14bb325SJeff Bonwick zio->io_error = ENXIO; 2400e14bb325SJeff Bonwick 2401e14bb325SJeff Bonwick /* 2402e14bb325SJeff Bonwick * If we can't write to an interior vdev (mirror or RAID-Z), 2403e14bb325SJeff Bonwick * set vdev_cant_write so that we stop trying to allocate from it. 2404e14bb325SJeff Bonwick */ 2405e14bb325SJeff Bonwick if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && 2406e14bb325SJeff Bonwick vd != NULL && !vd->vdev_ops->vdev_op_leaf) 2407e14bb325SJeff Bonwick vd->vdev_cant_write = B_TRUE; 2408e14bb325SJeff Bonwick 2409e14bb325SJeff Bonwick if (zio->io_error) 2410e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2411e14bb325SJeff Bonwick 2412e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2413fa9e4066Sahrens } 2414fa9e4066Sahrens 2415fa9e4066Sahrens void 2416fa9e4066Sahrens zio_vdev_io_reissue(zio_t *zio) 2417fa9e4066Sahrens { 2418fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2419fa9e4066Sahrens ASSERT(zio->io_error == 0); 2420fa9e4066Sahrens 2421b24ab676SJeff Bonwick zio->io_stage >>= 1; 2422fa9e4066Sahrens } 2423fa9e4066Sahrens 2424fa9e4066Sahrens void 2425fa9e4066Sahrens zio_vdev_io_redone(zio_t *zio) 2426fa9e4066Sahrens { 2427fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); 2428fa9e4066Sahrens 2429b24ab676SJeff Bonwick zio->io_stage >>= 1; 2430fa9e4066Sahrens } 2431fa9e4066Sahrens 2432fa9e4066Sahrens void 2433fa9e4066Sahrens zio_vdev_io_bypass(zio_t *zio) 2434fa9e4066Sahrens { 2435fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2436fa9e4066Sahrens ASSERT(zio->io_error == 0); 2437fa9e4066Sahrens 2438fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_IO_BYPASS; 2439b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; 2440fa9e4066Sahrens } 2441fa9e4066Sahrens 2442fa9e4066Sahrens /* 2443fa9e4066Sahrens * ========================================================================== 2444fa9e4066Sahrens * Generate and verify checksums 2445fa9e4066Sahrens * ========================================================================== 2446fa9e4066Sahrens */ 2447e05725b1Sbonwick static int 2448fa9e4066Sahrens zio_checksum_generate(zio_t *zio) 2449fa9e4066Sahrens { 2450fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2451e14bb325SJeff Bonwick enum zio_checksum checksum; 2452fa9e4066Sahrens 2453e14bb325SJeff Bonwick if (bp == NULL) { 2454e14bb325SJeff Bonwick /* 2455e14bb325SJeff Bonwick * This is zio_write_phys(). 2456e14bb325SJeff Bonwick * We're either generating a label checksum, or none at all. 2457e14bb325SJeff Bonwick */ 2458e14bb325SJeff Bonwick checksum = zio->io_prop.zp_checksum; 2459e14bb325SJeff Bonwick 2460e14bb325SJeff Bonwick if (checksum == ZIO_CHECKSUM_OFF) 2461e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2462fa9e4066Sahrens 2463e14bb325SJeff Bonwick ASSERT(checksum == ZIO_CHECKSUM_LABEL); 2464e14bb325SJeff Bonwick } else { 2465e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { 2466e14bb325SJeff Bonwick ASSERT(!IO_IS_ALLOCATING(zio)); 2467e14bb325SJeff Bonwick checksum = ZIO_CHECKSUM_GANG_HEADER; 2468e14bb325SJeff Bonwick } else { 2469e14bb325SJeff Bonwick checksum = BP_GET_CHECKSUM(bp); 2470e14bb325SJeff Bonwick } 2471e14bb325SJeff Bonwick } 2472fa9e4066Sahrens 2473e14bb325SJeff Bonwick zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); 2474fa9e4066Sahrens 2475e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2476fa9e4066Sahrens } 2477fa9e4066Sahrens 2478e05725b1Sbonwick static int 2479e14bb325SJeff Bonwick zio_checksum_verify(zio_t *zio) 2480fa9e4066Sahrens { 248122fe2c88SJonathan Adams zio_bad_cksum_t info; 2482e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2483e14bb325SJeff Bonwick int error; 2484fa9e4066Sahrens 2485b24ab676SJeff Bonwick ASSERT(zio->io_vd != NULL); 2486b24ab676SJeff Bonwick 2487e14bb325SJeff Bonwick if (bp == NULL) { 2488e14bb325SJeff Bonwick /* 2489e14bb325SJeff Bonwick * This is zio_read_phys(). 2490e14bb325SJeff Bonwick * We're either verifying a label checksum, or nothing at all. 2491e14bb325SJeff Bonwick */ 2492e14bb325SJeff Bonwick if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) 2493e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2494fa9e4066Sahrens 2495e14bb325SJeff Bonwick ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); 2496e14bb325SJeff Bonwick } 2497fa9e4066Sahrens 249822fe2c88SJonathan Adams if ((error = zio_checksum_error(zio, &info)) != 0) { 2499e14bb325SJeff Bonwick zio->io_error = error; 2500e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { 250122fe2c88SJonathan Adams zfs_ereport_start_checksum(zio->io_spa, 250222fe2c88SJonathan Adams zio->io_vd, zio, zio->io_offset, 250322fe2c88SJonathan Adams zio->io_size, NULL, &info); 2504e14bb325SJeff Bonwick } 2505fa9e4066Sahrens } 2506fa9e4066Sahrens 2507e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2508fa9e4066Sahrens } 2509fa9e4066Sahrens 2510fa9e4066Sahrens /* 2511fa9e4066Sahrens * Called by RAID-Z to ensure we don't compute the checksum twice. 2512fa9e4066Sahrens */ 2513fa9e4066Sahrens void 2514fa9e4066Sahrens zio_checksum_verified(zio_t *zio) 2515fa9e4066Sahrens { 2516b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 2517fa9e4066Sahrens } 2518fa9e4066Sahrens 2519fa9e4066Sahrens /* 2520e14bb325SJeff Bonwick * ========================================================================== 2521e14bb325SJeff Bonwick * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. 2522e14bb325SJeff Bonwick * An error of 0 indictes success. ENXIO indicates whole-device failure, 2523e14bb325SJeff Bonwick * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO 2524e14bb325SJeff Bonwick * indicate errors that are specific to one I/O, and most likely permanent. 2525e14bb325SJeff Bonwick * Any other error is presumed to be worse because we weren't expecting it. 2526e14bb325SJeff Bonwick * ========================================================================== 2527fa9e4066Sahrens */ 2528e14bb325SJeff Bonwick int 2529e14bb325SJeff Bonwick zio_worst_error(int e1, int e2) 2530fa9e4066Sahrens { 2531e14bb325SJeff Bonwick static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; 2532e14bb325SJeff Bonwick int r1, r2; 2533e14bb325SJeff Bonwick 2534e14bb325SJeff Bonwick for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) 2535e14bb325SJeff Bonwick if (e1 == zio_error_rank[r1]) 2536e14bb325SJeff Bonwick break; 2537e14bb325SJeff Bonwick 2538e14bb325SJeff Bonwick for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) 2539e14bb325SJeff Bonwick if (e2 == zio_error_rank[r2]) 2540e14bb325SJeff Bonwick break; 254144cd46caSbillm 2542e14bb325SJeff Bonwick return (r1 > r2 ? e1 : e2); 2543fa9e4066Sahrens } 2544fa9e4066Sahrens 2545fa9e4066Sahrens /* 2546fa9e4066Sahrens * ========================================================================== 2547e14bb325SJeff Bonwick * I/O completion 2548fa9e4066Sahrens * ========================================================================== 2549fa9e4066Sahrens */ 2550e14bb325SJeff Bonwick static int 2551e14bb325SJeff Bonwick zio_ready(zio_t *zio) 2552fa9e4066Sahrens { 2553e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2554a3f829aeSBill Moore zio_t *pio, *pio_next; 2555fa9e4066Sahrens 2556b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 2557b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_READY)) 2558f5383399SBill Moore return (ZIO_PIPELINE_STOP); 2559fa9e4066Sahrens 2560f5383399SBill Moore if (zio->io_ready) { 2561e14bb325SJeff Bonwick ASSERT(IO_IS_ALLOCATING(zio)); 2562e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2563e14bb325SJeff Bonwick ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); 2564fa9e4066Sahrens 2565e14bb325SJeff Bonwick zio->io_ready(zio); 2566e14bb325SJeff Bonwick } 2567fa9e4066Sahrens 2568e14bb325SJeff Bonwick if (bp != NULL && bp != &zio->io_bp_copy) 2569e14bb325SJeff Bonwick zio->io_bp_copy = *bp; 2570fa9e4066Sahrens 2571e14bb325SJeff Bonwick if (zio->io_error) 2572e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2573fa9e4066Sahrens 2574a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2575a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = 1; 2576a3f829aeSBill Moore pio = zio_walk_parents(zio); 2577a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2578a3f829aeSBill Moore 2579a3f829aeSBill Moore /* 2580a3f829aeSBill Moore * As we notify zio's parents, new parents could be added. 2581a3f829aeSBill Moore * New parents go to the head of zio's io_parent_list, however, 2582a3f829aeSBill Moore * so we will (correctly) not notify them. The remainder of zio's 2583a3f829aeSBill Moore * io_parent_list, from 'pio_next' onward, cannot change because 2584a3f829aeSBill Moore * all parents must wait for us to be done before they can be done. 2585a3f829aeSBill Moore */ 2586a3f829aeSBill Moore for (; pio != NULL; pio = pio_next) { 2587a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2588e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_READY); 2589a3f829aeSBill Moore } 2590fa9e4066Sahrens 2591b24ab676SJeff Bonwick if (zio->io_flags & ZIO_FLAG_NODATA) { 2592b24ab676SJeff Bonwick if (BP_IS_GANG(bp)) { 2593b24ab676SJeff Bonwick zio->io_flags &= ~ZIO_FLAG_NODATA; 2594b24ab676SJeff Bonwick } else { 2595b24ab676SJeff Bonwick ASSERT((uintptr_t)zio->io_data < SPA_MAXBLOCKSIZE); 2596b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 2597b24ab676SJeff Bonwick } 2598b24ab676SJeff Bonwick } 2599b24ab676SJeff Bonwick 2600a33cae98STim Haley if (zio_injection_enabled && 2601a33cae98STim Haley zio->io_spa->spa_syncing_txg == zio->io_txg) 2602a33cae98STim Haley zio_handle_ignored_writes(zio); 2603a33cae98STim Haley 2604e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2605fa9e4066Sahrens } 2606fa9e4066Sahrens 2607e14bb325SJeff Bonwick static int 2608e14bb325SJeff Bonwick zio_done(zio_t *zio) 2609d63d470bSgw { 2610e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 2611e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 2612e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2613e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2614e14bb325SJeff Bonwick uint64_t psize = zio->io_size; 2615a3f829aeSBill Moore zio_t *pio, *pio_next; 2616d63d470bSgw 2617e14bb325SJeff Bonwick /* 2618f5383399SBill Moore * If our children haven't all completed, 2619e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 2620e14bb325SJeff Bonwick */ 2621e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || 2622e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || 2623b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE) || 2624e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) 2625e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2626d63d470bSgw 2627e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 2628e14bb325SJeff Bonwick for (int w = 0; w < ZIO_WAIT_TYPES; w++) 2629e14bb325SJeff Bonwick ASSERT(zio->io_children[c][w] == 0); 2630e14bb325SJeff Bonwick 2631e14bb325SJeff Bonwick if (bp != NULL) { 2632e14bb325SJeff Bonwick ASSERT(bp->blk_pad[0] == 0); 2633e14bb325SJeff Bonwick ASSERT(bp->blk_pad[1] == 0); 2634e14bb325SJeff Bonwick ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || 2635a3f829aeSBill Moore (bp == zio_unique_parent(zio)->io_bp)); 2636e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && 2637b24ab676SJeff Bonwick zio->io_bp_override == NULL && 2638e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { 2639e14bb325SJeff Bonwick ASSERT(!BP_SHOULD_BYTESWAP(bp)); 2640b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(bp)); 2641e14bb325SJeff Bonwick ASSERT(BP_COUNT_GANG(bp) == 0 || 2642e14bb325SJeff Bonwick (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); 2643e14bb325SJeff Bonwick } 2644e14bb325SJeff Bonwick } 2645fa9e4066Sahrens 2646e14bb325SJeff Bonwick /* 2647b24ab676SJeff Bonwick * If there were child vdev/gang/ddt errors, they apply to us now. 2648e14bb325SJeff Bonwick */ 2649e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); 2650e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_GANG); 2651b24ab676SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_DDT); 2652b24ab676SJeff Bonwick 2653b24ab676SJeff Bonwick /* 2654b24ab676SJeff Bonwick * If the I/O on the transformed data was successful, generate any 2655b24ab676SJeff Bonwick * checksum reports now while we still have the transformed data. 2656b24ab676SJeff Bonwick */ 2657b24ab676SJeff Bonwick if (zio->io_error == 0) { 2658b24ab676SJeff Bonwick while (zio->io_cksum_report != NULL) { 2659b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 2660b24ab676SJeff Bonwick uint64_t align = zcr->zcr_align; 2661b24ab676SJeff Bonwick uint64_t asize = P2ROUNDUP(psize, align); 2662b24ab676SJeff Bonwick char *abuf = zio->io_data; 2663b24ab676SJeff Bonwick 2664b24ab676SJeff Bonwick if (asize != psize) { 2665b24ab676SJeff Bonwick abuf = zio_buf_alloc(asize); 2666b24ab676SJeff Bonwick bcopy(zio->io_data, abuf, psize); 2667b24ab676SJeff Bonwick bzero(abuf + psize, asize - psize); 2668b24ab676SJeff Bonwick } 2669b24ab676SJeff Bonwick 2670b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 2671b24ab676SJeff Bonwick zcr->zcr_next = NULL; 2672b24ab676SJeff Bonwick zcr->zcr_finish(zcr, abuf); 2673b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 2674b24ab676SJeff Bonwick 2675b24ab676SJeff Bonwick if (asize != psize) 2676b24ab676SJeff Bonwick zio_buf_free(abuf, asize); 2677b24ab676SJeff Bonwick } 2678b24ab676SJeff Bonwick } 2679e14bb325SJeff Bonwick 2680e14bb325SJeff Bonwick zio_pop_transforms(zio); /* note: may set zio->io_error */ 2681e14bb325SJeff Bonwick 2682e14bb325SJeff Bonwick vdev_stat_update(zio, psize); 2683e14bb325SJeff Bonwick 2684e14bb325SJeff Bonwick if (zio->io_error) { 2685e14bb325SJeff Bonwick /* 2686e14bb325SJeff Bonwick * If this I/O is attached to a particular vdev, 2687e14bb325SJeff Bonwick * generate an error message describing the I/O failure 2688e14bb325SJeff Bonwick * at the block level. We ignore these errors if the 2689e14bb325SJeff Bonwick * device is currently unavailable. 2690e14bb325SJeff Bonwick */ 2691e14bb325SJeff Bonwick if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) 2692e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, zio, 0, 0); 2693e14bb325SJeff Bonwick 26948f18d1faSGeorge Wilson if ((zio->io_error == EIO || !(zio->io_flags & 26958f18d1faSGeorge Wilson (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && 26968f18d1faSGeorge Wilson zio == lio) { 2697e14bb325SJeff Bonwick /* 2698e14bb325SJeff Bonwick * For logical I/O requests, tell the SPA to log the 2699e14bb325SJeff Bonwick * error and generate a logical data ereport. 2700e14bb325SJeff Bonwick */ 2701e14bb325SJeff Bonwick spa_log_error(spa, zio); 2702e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, zio, 2703e14bb325SJeff Bonwick 0, 0); 2704e14bb325SJeff Bonwick } 2705e14bb325SJeff Bonwick } 2706fa9e4066Sahrens 2707e14bb325SJeff Bonwick if (zio->io_error && zio == lio) { 2708e14bb325SJeff Bonwick /* 2709e14bb325SJeff Bonwick * Determine whether zio should be reexecuted. This will 2710e14bb325SJeff Bonwick * propagate all the way to the root via zio_notify_parent(). 2711e14bb325SJeff Bonwick */ 2712e14bb325SJeff Bonwick ASSERT(vd == NULL && bp != NULL); 2713b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2714e14bb325SJeff Bonwick 2715b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(zio) && 2716b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_CANFAIL)) { 2717e14bb325SJeff Bonwick if (zio->io_error != ENOSPC) 2718e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_NOW; 2719e14bb325SJeff Bonwick else 2720e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2721b24ab676SJeff Bonwick } 2722e14bb325SJeff Bonwick 2723e14bb325SJeff Bonwick if ((zio->io_type == ZIO_TYPE_READ || 2724e14bb325SJeff Bonwick zio->io_type == ZIO_TYPE_FREE) && 2725e14bb325SJeff Bonwick zio->io_error == ENXIO && 2726b16da2e2SGeorge Wilson spa_load_state(spa) == SPA_LOAD_NONE && 2727e14bb325SJeff Bonwick spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) 2728e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2729e14bb325SJeff Bonwick 2730e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) 2731e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 273222fe2c88SJonathan Adams 273322fe2c88SJonathan Adams /* 273422fe2c88SJonathan Adams * Here is a possibly good place to attempt to do 273522fe2c88SJonathan Adams * either combinatorial reconstruction or error correction 273622fe2c88SJonathan Adams * based on checksums. It also might be a good place 273722fe2c88SJonathan Adams * to send out preliminary ereports before we suspend 273822fe2c88SJonathan Adams * processing. 273922fe2c88SJonathan Adams */ 2740d63d470bSgw } 2741d63d470bSgw 274267bd71c6Sperrin /* 2743e14bb325SJeff Bonwick * If there were logical child errors, they apply to us now. 2744e14bb325SJeff Bonwick * We defer this until now to avoid conflating logical child 2745e14bb325SJeff Bonwick * errors with errors that happened to the zio itself when 2746e14bb325SJeff Bonwick * updating vdev stats and reporting FMA events above. 274767bd71c6Sperrin */ 2748e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); 27498654d025Sperrin 2750b24ab676SJeff Bonwick if ((zio->io_error || zio->io_reexecute) && 2751b24ab676SJeff Bonwick IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && 2752b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REWRITE)) 2753f5383399SBill Moore zio_dva_unallocate(zio, zio->io_gang_tree, bp); 2754f5383399SBill Moore 2755f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 2756f5383399SBill Moore 275733a372edSGeorge Wilson /* 275833a372edSGeorge Wilson * Godfather I/Os should never suspend. 275933a372edSGeorge Wilson */ 276033a372edSGeorge Wilson if ((zio->io_flags & ZIO_FLAG_GODFATHER) && 276133a372edSGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) 276233a372edSGeorge Wilson zio->io_reexecute = 0; 276333a372edSGeorge Wilson 276433a372edSGeorge Wilson if (zio->io_reexecute) { 2765e14bb325SJeff Bonwick /* 2766e14bb325SJeff Bonwick * This is a logical I/O that wants to reexecute. 2767e14bb325SJeff Bonwick * 2768e14bb325SJeff Bonwick * Reexecute is top-down. When an i/o fails, if it's not 2769e14bb325SJeff Bonwick * the root, it simply notifies its parent and sticks around. 2770e14bb325SJeff Bonwick * The parent, seeing that it still has children in zio_done(), 2771e14bb325SJeff Bonwick * does the same. This percolates all the way up to the root. 2772e14bb325SJeff Bonwick * The root i/o will reexecute or suspend the entire tree. 2773e14bb325SJeff Bonwick * 2774e14bb325SJeff Bonwick * This approach ensures that zio_reexecute() honors 2775e14bb325SJeff Bonwick * all the original i/o dependency relationships, e.g. 2776e14bb325SJeff Bonwick * parents not executing until children are ready. 2777e14bb325SJeff Bonwick */ 2778e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2779fa9e4066Sahrens 2780f5383399SBill Moore zio->io_gang_leader = NULL; 2781e14bb325SJeff Bonwick 2782a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2783a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 2784a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2785a3f829aeSBill Moore 278654d692b7SGeorge Wilson /* 278754d692b7SGeorge Wilson * "The Godfather" I/O monitors its children but is 278854d692b7SGeorge Wilson * not a true parent to them. It will track them through 278954d692b7SGeorge Wilson * the pipeline but severs its ties whenever they get into 279054d692b7SGeorge Wilson * trouble (e.g. suspended). This allows "The Godfather" 279154d692b7SGeorge Wilson * I/O to return status without blocking. 279254d692b7SGeorge Wilson */ 279354d692b7SGeorge Wilson for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 279454d692b7SGeorge Wilson zio_link_t *zl = zio->io_walk_link; 279554d692b7SGeorge Wilson pio_next = zio_walk_parents(zio); 279654d692b7SGeorge Wilson 279754d692b7SGeorge Wilson if ((pio->io_flags & ZIO_FLAG_GODFATHER) && 279854d692b7SGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { 279954d692b7SGeorge Wilson zio_remove_child(pio, zio, zl); 280054d692b7SGeorge Wilson zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 280154d692b7SGeorge Wilson } 280254d692b7SGeorge Wilson } 280354d692b7SGeorge Wilson 2804a3f829aeSBill Moore if ((pio = zio_unique_parent(zio)) != NULL) { 2805e14bb325SJeff Bonwick /* 2806e14bb325SJeff Bonwick * We're not a root i/o, so there's nothing to do 2807e14bb325SJeff Bonwick * but notify our parent. Don't propagate errors 2808e14bb325SJeff Bonwick * upward since we haven't permanently failed yet. 2809e14bb325SJeff Bonwick */ 281033a372edSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 2811e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; 2812e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2813e14bb325SJeff Bonwick } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { 2814e14bb325SJeff Bonwick /* 2815e14bb325SJeff Bonwick * We'd fail again if we reexecuted now, so suspend 2816e14bb325SJeff Bonwick * until conditions improve (e.g. device comes online). 2817e14bb325SJeff Bonwick */ 2818e14bb325SJeff Bonwick zio_suspend(spa, zio); 2819e14bb325SJeff Bonwick } else { 2820e14bb325SJeff Bonwick /* 2821e14bb325SJeff Bonwick * Reexecution is potentially a huge amount of work. 2822e14bb325SJeff Bonwick * Hand it off to the otherwise-unused claim taskq. 2823e14bb325SJeff Bonwick */ 2824e14bb325SJeff Bonwick (void) taskq_dispatch( 2825e14bb325SJeff Bonwick spa->spa_zio_taskq[ZIO_TYPE_CLAIM][ZIO_TASKQ_ISSUE], 2826e14bb325SJeff Bonwick (task_func_t *)zio_reexecute, zio, TQ_SLEEP); 2827e14bb325SJeff Bonwick } 2828e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2829fa9e4066Sahrens } 2830fa9e4066Sahrens 2831b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 283233a372edSGeorge Wilson ASSERT(zio->io_reexecute == 0); 2833e14bb325SJeff Bonwick ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); 2834fa9e4066Sahrens 2835b24ab676SJeff Bonwick /* 2836b24ab676SJeff Bonwick * Report any checksum errors, since the I/O is complete. 2837b24ab676SJeff Bonwick */ 283822fe2c88SJonathan Adams while (zio->io_cksum_report != NULL) { 2839b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 2840b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 2841b24ab676SJeff Bonwick zcr->zcr_next = NULL; 2842b24ab676SJeff Bonwick zcr->zcr_finish(zcr, NULL); 2843b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 284422fe2c88SJonathan Adams } 284522fe2c88SJonathan Adams 2846a3f829aeSBill Moore /* 2847a3f829aeSBill Moore * It is the responsibility of the done callback to ensure that this 2848a3f829aeSBill Moore * particular zio is no longer discoverable for adoption, and as 2849a3f829aeSBill Moore * such, cannot acquire any new parents. 2850a3f829aeSBill Moore */ 2851e14bb325SJeff Bonwick if (zio->io_done) 2852e14bb325SJeff Bonwick zio->io_done(zio); 2853fa9e4066Sahrens 2854a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2855a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 2856a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2857fa9e4066Sahrens 2858a3f829aeSBill Moore for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 2859a3f829aeSBill Moore zio_link_t *zl = zio->io_walk_link; 2860a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2861a3f829aeSBill Moore zio_remove_child(pio, zio, zl); 2862e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2863e14bb325SJeff Bonwick } 2864fa9e4066Sahrens 2865e14bb325SJeff Bonwick if (zio->io_waiter != NULL) { 2866e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 2867e14bb325SJeff Bonwick zio->io_executor = NULL; 2868e14bb325SJeff Bonwick cv_broadcast(&zio->io_cv); 2869e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 2870e14bb325SJeff Bonwick } else { 2871e14bb325SJeff Bonwick zio_destroy(zio); 2872e14bb325SJeff Bonwick } 2873fa9e4066Sahrens 2874e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2875fa9e4066Sahrens } 287646341222Sperrin 287746341222Sperrin /* 2878e14bb325SJeff Bonwick * ========================================================================== 2879e14bb325SJeff Bonwick * I/O pipeline definition 2880e14bb325SJeff Bonwick * ========================================================================== 288146341222Sperrin */ 2882b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[] = { 2883e14bb325SJeff Bonwick NULL, 2884e14bb325SJeff Bonwick zio_read_bp_init, 2885b24ab676SJeff Bonwick zio_free_bp_init, 2886b24ab676SJeff Bonwick zio_issue_async, 2887e14bb325SJeff Bonwick zio_write_bp_init, 2888e14bb325SJeff Bonwick zio_checksum_generate, 2889b24ab676SJeff Bonwick zio_ddt_read_start, 2890b24ab676SJeff Bonwick zio_ddt_read_done, 2891b24ab676SJeff Bonwick zio_ddt_write, 2892b24ab676SJeff Bonwick zio_ddt_free, 2893e14bb325SJeff Bonwick zio_gang_assemble, 2894e14bb325SJeff Bonwick zio_gang_issue, 2895e14bb325SJeff Bonwick zio_dva_allocate, 2896e14bb325SJeff Bonwick zio_dva_free, 2897e14bb325SJeff Bonwick zio_dva_claim, 2898e14bb325SJeff Bonwick zio_ready, 2899e14bb325SJeff Bonwick zio_vdev_io_start, 2900e14bb325SJeff Bonwick zio_vdev_io_done, 2901e14bb325SJeff Bonwick zio_vdev_io_assess, 2902e14bb325SJeff Bonwick zio_checksum_verify, 2903e14bb325SJeff Bonwick zio_done 2904e14bb325SJeff Bonwick }; 2905