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> 35fa9e4066Sahrens 36fa9e4066Sahrens /* 37fa9e4066Sahrens * ========================================================================== 38fa9e4066Sahrens * I/O priority table 39fa9e4066Sahrens * ========================================================================== 40fa9e4066Sahrens */ 41fa9e4066Sahrens uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE] = { 42fa9e4066Sahrens 0, /* ZIO_PRIORITY_NOW */ 43fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_READ */ 44fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_WRITE */ 45fa9e4066Sahrens 6, /* ZIO_PRIORITY_ASYNC_READ */ 46fa9e4066Sahrens 4, /* ZIO_PRIORITY_ASYNC_WRITE */ 47fa9e4066Sahrens 4, /* ZIO_PRIORITY_FREE */ 48fa9e4066Sahrens 0, /* ZIO_PRIORITY_CACHE_FILL */ 49fa9e4066Sahrens 0, /* ZIO_PRIORITY_LOG_WRITE */ 50fa9e4066Sahrens 10, /* ZIO_PRIORITY_RESILVER */ 51fa9e4066Sahrens 20, /* ZIO_PRIORITY_SCRUB */ 52fa9e4066Sahrens }; 53fa9e4066Sahrens 54fa9e4066Sahrens /* 55fa9e4066Sahrens * ========================================================================== 56fa9e4066Sahrens * I/O type descriptions 57fa9e4066Sahrens * ========================================================================== 58fa9e4066Sahrens */ 59fa9e4066Sahrens char *zio_type_name[ZIO_TYPES] = { 60fa9e4066Sahrens "null", "read", "write", "free", "claim", "ioctl" }; 61fa9e4066Sahrens 62e14bb325SJeff Bonwick #define SYNC_PASS_DEFERRED_FREE 1 /* defer frees after this pass */ 63e14bb325SJeff Bonwick #define SYNC_PASS_DONT_COMPRESS 4 /* don't compress after this pass */ 64e14bb325SJeff Bonwick #define SYNC_PASS_REWRITE 1 /* rewrite new bps after this pass */ 650a4e9518Sgw 66fa9e4066Sahrens /* 67fa9e4066Sahrens * ========================================================================== 68fa9e4066Sahrens * I/O kmem caches 69fa9e4066Sahrens * ========================================================================== 70fa9e4066Sahrens */ 71ccae0b50Seschrock kmem_cache_t *zio_cache; 72a3f829aeSBill Moore kmem_cache_t *zio_link_cache; 73fa9e4066Sahrens kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 74ad23a2dbSjohansen kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 75ad23a2dbSjohansen 76ad23a2dbSjohansen #ifdef _KERNEL 77ad23a2dbSjohansen extern vmem_t *zio_alloc_arena; 78ad23a2dbSjohansen #endif 79fa9e4066Sahrens 800a4e9518Sgw /* 81e14bb325SJeff Bonwick * An allocating zio is one that either currently has the DVA allocate 82e14bb325SJeff Bonwick * stage set or will have it later in its lifetime. 830a4e9518Sgw */ 840a4e9518Sgw #define IO_IS_ALLOCATING(zio) \ 8517f17c2dSbonwick ((zio)->io_orig_pipeline & (1U << ZIO_STAGE_DVA_ALLOCATE)) 860a4e9518Sgw 87fa9e4066Sahrens void 88fa9e4066Sahrens zio_init(void) 89fa9e4066Sahrens { 90fa9e4066Sahrens size_t c; 91ad23a2dbSjohansen vmem_t *data_alloc_arena = NULL; 92ad23a2dbSjohansen 93ad23a2dbSjohansen #ifdef _KERNEL 94ad23a2dbSjohansen data_alloc_arena = zio_alloc_arena; 95ad23a2dbSjohansen #endif 96a3f829aeSBill Moore zio_cache = kmem_cache_create("zio_cache", 97a3f829aeSBill Moore sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 98a3f829aeSBill Moore zio_link_cache = kmem_cache_create("zio_link_cache", 99a3f829aeSBill Moore sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 100ccae0b50Seschrock 101fa9e4066Sahrens /* 102fa9e4066Sahrens * For small buffers, we want a cache for each multiple of 103fa9e4066Sahrens * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache 104fa9e4066Sahrens * for each quarter-power of 2. For large buffers, we want 105fa9e4066Sahrens * a cache for each multiple of PAGESIZE. 106fa9e4066Sahrens */ 107fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 108fa9e4066Sahrens size_t size = (c + 1) << SPA_MINBLOCKSHIFT; 109fa9e4066Sahrens size_t p2 = size; 110fa9e4066Sahrens size_t align = 0; 111fa9e4066Sahrens 112fa9e4066Sahrens while (p2 & (p2 - 1)) 113fa9e4066Sahrens p2 &= p2 - 1; 114fa9e4066Sahrens 115fa9e4066Sahrens if (size <= 4 * SPA_MINBLOCKSIZE) { 116fa9e4066Sahrens align = SPA_MINBLOCKSIZE; 117fa9e4066Sahrens } else if (P2PHASE(size, PAGESIZE) == 0) { 118fa9e4066Sahrens align = PAGESIZE; 119fa9e4066Sahrens } else if (P2PHASE(size, p2 >> 2) == 0) { 120fa9e4066Sahrens align = p2 >> 2; 121fa9e4066Sahrens } 122fa9e4066Sahrens 123fa9e4066Sahrens if (align != 0) { 124ad23a2dbSjohansen char name[36]; 1255ad82045Snd (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); 126fa9e4066Sahrens zio_buf_cache[c] = kmem_cache_create(name, size, 127a0965f35Sbonwick align, NULL, NULL, NULL, NULL, NULL, KMC_NODEBUG); 128ad23a2dbSjohansen 129ad23a2dbSjohansen (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); 130ad23a2dbSjohansen zio_data_buf_cache[c] = kmem_cache_create(name, size, 131ad23a2dbSjohansen align, NULL, NULL, NULL, NULL, data_alloc_arena, 132ad23a2dbSjohansen KMC_NODEBUG); 133fa9e4066Sahrens } 134fa9e4066Sahrens } 135fa9e4066Sahrens 136fa9e4066Sahrens while (--c != 0) { 137fa9e4066Sahrens ASSERT(zio_buf_cache[c] != NULL); 138fa9e4066Sahrens if (zio_buf_cache[c - 1] == NULL) 139fa9e4066Sahrens zio_buf_cache[c - 1] = zio_buf_cache[c]; 140ad23a2dbSjohansen 141ad23a2dbSjohansen ASSERT(zio_data_buf_cache[c] != NULL); 142ad23a2dbSjohansen if (zio_data_buf_cache[c - 1] == NULL) 143ad23a2dbSjohansen zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; 144fa9e4066Sahrens } 145ea8dc4b6Seschrock 146ea8dc4b6Seschrock zio_inject_init(); 147fa9e4066Sahrens } 148fa9e4066Sahrens 149fa9e4066Sahrens void 150fa9e4066Sahrens zio_fini(void) 151fa9e4066Sahrens { 152fa9e4066Sahrens size_t c; 153fa9e4066Sahrens kmem_cache_t *last_cache = NULL; 154ad23a2dbSjohansen kmem_cache_t *last_data_cache = NULL; 155fa9e4066Sahrens 156fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 157fa9e4066Sahrens if (zio_buf_cache[c] != last_cache) { 158fa9e4066Sahrens last_cache = zio_buf_cache[c]; 159fa9e4066Sahrens kmem_cache_destroy(zio_buf_cache[c]); 160fa9e4066Sahrens } 161fa9e4066Sahrens zio_buf_cache[c] = NULL; 162ad23a2dbSjohansen 163ad23a2dbSjohansen if (zio_data_buf_cache[c] != last_data_cache) { 164ad23a2dbSjohansen last_data_cache = zio_data_buf_cache[c]; 165ad23a2dbSjohansen kmem_cache_destroy(zio_data_buf_cache[c]); 166ad23a2dbSjohansen } 167ad23a2dbSjohansen zio_data_buf_cache[c] = NULL; 168fa9e4066Sahrens } 169ea8dc4b6Seschrock 170a3f829aeSBill Moore kmem_cache_destroy(zio_link_cache); 171ccae0b50Seschrock kmem_cache_destroy(zio_cache); 172ccae0b50Seschrock 173ea8dc4b6Seschrock zio_inject_fini(); 174fa9e4066Sahrens } 175fa9e4066Sahrens 176fa9e4066Sahrens /* 177fa9e4066Sahrens * ========================================================================== 178fa9e4066Sahrens * Allocate and free I/O buffers 179fa9e4066Sahrens * ========================================================================== 180fa9e4066Sahrens */ 181ad23a2dbSjohansen 182ad23a2dbSjohansen /* 183ad23a2dbSjohansen * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a 184ad23a2dbSjohansen * crashdump if the kernel panics, so use it judiciously. Obviously, it's 185ad23a2dbSjohansen * useful to inspect ZFS metadata, but if possible, we should avoid keeping 186ad23a2dbSjohansen * excess / transient data in-core during a crashdump. 187ad23a2dbSjohansen */ 188fa9e4066Sahrens void * 189fa9e4066Sahrens zio_buf_alloc(size_t size) 190fa9e4066Sahrens { 191fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 192fa9e4066Sahrens 193fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 194fa9e4066Sahrens 1951ab7f2deSmaybee return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); 196fa9e4066Sahrens } 197fa9e4066Sahrens 198ad23a2dbSjohansen /* 199ad23a2dbSjohansen * Use zio_data_buf_alloc to allocate data. The data will not appear in a 200ad23a2dbSjohansen * crashdump if the kernel panics. This exists so that we will limit the amount 201ad23a2dbSjohansen * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount 202ad23a2dbSjohansen * of kernel heap dumped to disk when the kernel panics) 203ad23a2dbSjohansen */ 204ad23a2dbSjohansen void * 205ad23a2dbSjohansen zio_data_buf_alloc(size_t size) 206ad23a2dbSjohansen { 207ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 208ad23a2dbSjohansen 209ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 210ad23a2dbSjohansen 2111ab7f2deSmaybee return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); 212ad23a2dbSjohansen } 213ad23a2dbSjohansen 214fa9e4066Sahrens void 215fa9e4066Sahrens zio_buf_free(void *buf, size_t size) 216fa9e4066Sahrens { 217fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 218fa9e4066Sahrens 219fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 220fa9e4066Sahrens 221fa9e4066Sahrens kmem_cache_free(zio_buf_cache[c], buf); 222fa9e4066Sahrens } 223fa9e4066Sahrens 224ad23a2dbSjohansen void 225ad23a2dbSjohansen zio_data_buf_free(void *buf, size_t size) 226ad23a2dbSjohansen { 227ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 228ad23a2dbSjohansen 229ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 230ad23a2dbSjohansen 231ad23a2dbSjohansen kmem_cache_free(zio_data_buf_cache[c], buf); 232ad23a2dbSjohansen } 233b3995adbSahrens 234fa9e4066Sahrens /* 235fa9e4066Sahrens * ========================================================================== 236fa9e4066Sahrens * Push and pop I/O transform buffers 237fa9e4066Sahrens * ========================================================================== 238fa9e4066Sahrens */ 239fa9e4066Sahrens static void 240e14bb325SJeff Bonwick zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, 241e14bb325SJeff Bonwick zio_transform_func_t *transform) 242fa9e4066Sahrens { 243fa9e4066Sahrens zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); 244fa9e4066Sahrens 245e14bb325SJeff Bonwick zt->zt_orig_data = zio->io_data; 246e14bb325SJeff Bonwick zt->zt_orig_size = zio->io_size; 247fa9e4066Sahrens zt->zt_bufsize = bufsize; 248e14bb325SJeff Bonwick zt->zt_transform = transform; 249fa9e4066Sahrens 250fa9e4066Sahrens zt->zt_next = zio->io_transform_stack; 251fa9e4066Sahrens zio->io_transform_stack = zt; 252fa9e4066Sahrens 253fa9e4066Sahrens zio->io_data = data; 254fa9e4066Sahrens zio->io_size = size; 255fa9e4066Sahrens } 256fa9e4066Sahrens 257fa9e4066Sahrens static void 258e14bb325SJeff Bonwick zio_pop_transforms(zio_t *zio) 259fa9e4066Sahrens { 260e14bb325SJeff Bonwick zio_transform_t *zt; 261e14bb325SJeff Bonwick 262e14bb325SJeff Bonwick while ((zt = zio->io_transform_stack) != NULL) { 263e14bb325SJeff Bonwick if (zt->zt_transform != NULL) 264e14bb325SJeff Bonwick zt->zt_transform(zio, 265e14bb325SJeff Bonwick zt->zt_orig_data, zt->zt_orig_size); 266fa9e4066Sahrens 267e14bb325SJeff Bonwick zio_buf_free(zio->io_data, zt->zt_bufsize); 268fa9e4066Sahrens 269e14bb325SJeff Bonwick zio->io_data = zt->zt_orig_data; 270e14bb325SJeff Bonwick zio->io_size = zt->zt_orig_size; 271e14bb325SJeff Bonwick zio->io_transform_stack = zt->zt_next; 272fa9e4066Sahrens 273e14bb325SJeff Bonwick kmem_free(zt, sizeof (zio_transform_t)); 274fa9e4066Sahrens } 275fa9e4066Sahrens } 276fa9e4066Sahrens 277e14bb325SJeff Bonwick /* 278e14bb325SJeff Bonwick * ========================================================================== 279e14bb325SJeff Bonwick * I/O transform callbacks for subblocks and decompression 280e14bb325SJeff Bonwick * ========================================================================== 281e14bb325SJeff Bonwick */ 282e14bb325SJeff Bonwick static void 283e14bb325SJeff Bonwick zio_subblock(zio_t *zio, void *data, uint64_t size) 284e14bb325SJeff Bonwick { 285e14bb325SJeff Bonwick ASSERT(zio->io_size > size); 286e14bb325SJeff Bonwick 287e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ) 288e14bb325SJeff Bonwick bcopy(zio->io_data, data, size); 289e14bb325SJeff Bonwick } 290e14bb325SJeff Bonwick 291e14bb325SJeff Bonwick static void 292e14bb325SJeff Bonwick zio_decompress(zio_t *zio, void *data, uint64_t size) 293e14bb325SJeff Bonwick { 294e14bb325SJeff Bonwick if (zio->io_error == 0 && 295e14bb325SJeff Bonwick zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), 296e14bb325SJeff Bonwick zio->io_data, zio->io_size, data, size) != 0) 297e14bb325SJeff Bonwick zio->io_error = EIO; 298e14bb325SJeff Bonwick } 299e14bb325SJeff Bonwick 300e14bb325SJeff Bonwick /* 301e14bb325SJeff Bonwick * ========================================================================== 302e14bb325SJeff Bonwick * I/O parent/child relationships and pipeline interlocks 303e14bb325SJeff Bonwick * ========================================================================== 304e14bb325SJeff Bonwick */ 305a3f829aeSBill Moore /* 306a3f829aeSBill Moore * NOTE - Callers to zio_walk_parents() and zio_walk_children must 307a3f829aeSBill Moore * continue calling these functions until they return NULL. 308a3f829aeSBill Moore * Otherwise, the next caller will pick up the list walk in 309a3f829aeSBill Moore * some indeterminate state. (Otherwise every caller would 310a3f829aeSBill Moore * have to pass in a cookie to keep the state represented by 311a3f829aeSBill Moore * io_walk_link, which gets annoying.) 312a3f829aeSBill Moore */ 313a3f829aeSBill Moore zio_t * 314a3f829aeSBill Moore zio_walk_parents(zio_t *cio) 315a3f829aeSBill Moore { 316a3f829aeSBill Moore zio_link_t *zl = cio->io_walk_link; 317a3f829aeSBill Moore list_t *pl = &cio->io_parent_list; 318e14bb325SJeff Bonwick 319a3f829aeSBill Moore zl = (zl == NULL) ? list_head(pl) : list_next(pl, zl); 320a3f829aeSBill Moore cio->io_walk_link = zl; 321a3f829aeSBill Moore 322a3f829aeSBill Moore if (zl == NULL) 323a3f829aeSBill Moore return (NULL); 324a3f829aeSBill Moore 325a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 326a3f829aeSBill Moore return (zl->zl_parent); 327a3f829aeSBill Moore } 328a3f829aeSBill Moore 329a3f829aeSBill Moore zio_t * 330a3f829aeSBill Moore zio_walk_children(zio_t *pio) 331a3f829aeSBill Moore { 332a3f829aeSBill Moore zio_link_t *zl = pio->io_walk_link; 333a3f829aeSBill Moore list_t *cl = &pio->io_child_list; 334a3f829aeSBill Moore 335a3f829aeSBill Moore zl = (zl == NULL) ? list_head(cl) : list_next(cl, zl); 336a3f829aeSBill Moore pio->io_walk_link = zl; 337a3f829aeSBill Moore 338a3f829aeSBill Moore if (zl == NULL) 339a3f829aeSBill Moore return (NULL); 340a3f829aeSBill Moore 341a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 342a3f829aeSBill Moore return (zl->zl_child); 343a3f829aeSBill Moore } 344a3f829aeSBill Moore 345a3f829aeSBill Moore zio_t * 346a3f829aeSBill Moore zio_unique_parent(zio_t *cio) 347a3f829aeSBill Moore { 348a3f829aeSBill Moore zio_t *pio = zio_walk_parents(cio); 349a3f829aeSBill Moore 350a3f829aeSBill Moore VERIFY(zio_walk_parents(cio) == NULL); 351a3f829aeSBill Moore return (pio); 352a3f829aeSBill Moore } 353a3f829aeSBill Moore 354a3f829aeSBill Moore void 355a3f829aeSBill Moore zio_add_child(zio_t *pio, zio_t *cio) 356e14bb325SJeff Bonwick { 357a3f829aeSBill Moore zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); 358a3f829aeSBill Moore 359a3f829aeSBill Moore /* 360a3f829aeSBill Moore * Logical I/Os can have logical, gang, or vdev children. 361a3f829aeSBill Moore * Gang I/Os can have gang or vdev children. 362a3f829aeSBill Moore * Vdev I/Os can only have vdev children. 363a3f829aeSBill Moore * The following ASSERT captures all of these constraints. 364a3f829aeSBill Moore */ 365a3f829aeSBill Moore ASSERT(cio->io_child_type <= pio->io_child_type); 366a3f829aeSBill Moore 367a3f829aeSBill Moore zl->zl_parent = pio; 368a3f829aeSBill Moore zl->zl_child = cio; 369a3f829aeSBill Moore 370a3f829aeSBill Moore mutex_enter(&cio->io_lock); 371e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 372a3f829aeSBill Moore 373a3f829aeSBill Moore ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); 374a3f829aeSBill Moore 375a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 376a3f829aeSBill Moore pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; 377a3f829aeSBill Moore 378a3f829aeSBill Moore list_insert_head(&pio->io_child_list, zl); 379a3f829aeSBill Moore list_insert_head(&cio->io_parent_list, zl); 380a3f829aeSBill Moore 381e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 382a3f829aeSBill Moore mutex_exit(&cio->io_lock); 383e14bb325SJeff Bonwick } 384e14bb325SJeff Bonwick 385fa9e4066Sahrens static void 386a3f829aeSBill Moore zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) 387e14bb325SJeff Bonwick { 388a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 389a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 390e14bb325SJeff Bonwick 391a3f829aeSBill Moore mutex_enter(&cio->io_lock); 392e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 393a3f829aeSBill Moore 394a3f829aeSBill Moore list_remove(&pio->io_child_list, zl); 395a3f829aeSBill Moore list_remove(&cio->io_parent_list, zl); 396a3f829aeSBill Moore 397e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 398a3f829aeSBill Moore mutex_exit(&cio->io_lock); 399a3f829aeSBill Moore 400a3f829aeSBill Moore kmem_cache_free(zio_link_cache, zl); 401e14bb325SJeff Bonwick } 402e14bb325SJeff Bonwick 403e14bb325SJeff Bonwick static boolean_t 404e14bb325SJeff Bonwick zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) 405fa9e4066Sahrens { 406e14bb325SJeff Bonwick uint64_t *countp = &zio->io_children[child][wait]; 407e14bb325SJeff Bonwick boolean_t waiting = B_FALSE; 408e14bb325SJeff Bonwick 409e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 410e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 411e14bb325SJeff Bonwick if (*countp != 0) { 412e14bb325SJeff Bonwick zio->io_stage--; 413e14bb325SJeff Bonwick zio->io_stall = countp; 414e14bb325SJeff Bonwick waiting = B_TRUE; 415e14bb325SJeff Bonwick } 416e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 417e14bb325SJeff Bonwick 418e14bb325SJeff Bonwick return (waiting); 419e14bb325SJeff Bonwick } 420fa9e4066Sahrens 421e14bb325SJeff Bonwick static void 422e14bb325SJeff Bonwick zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) 423e14bb325SJeff Bonwick { 424e14bb325SJeff Bonwick uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; 425e14bb325SJeff Bonwick int *errorp = &pio->io_child_error[zio->io_child_type]; 426fa9e4066Sahrens 427e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 428e14bb325SJeff Bonwick if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 429e14bb325SJeff Bonwick *errorp = zio_worst_error(*errorp, zio->io_error); 430e14bb325SJeff Bonwick pio->io_reexecute |= zio->io_reexecute; 431e14bb325SJeff Bonwick ASSERT3U(*countp, >, 0); 432e14bb325SJeff Bonwick if (--*countp == 0 && pio->io_stall == countp) { 433e14bb325SJeff Bonwick pio->io_stall = NULL; 434e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 435e14bb325SJeff Bonwick zio_execute(pio); 436e14bb325SJeff Bonwick } else { 437e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 438fa9e4066Sahrens } 439fa9e4066Sahrens } 440fa9e4066Sahrens 441e14bb325SJeff Bonwick static void 442e14bb325SJeff Bonwick zio_inherit_child_errors(zio_t *zio, enum zio_child c) 443e14bb325SJeff Bonwick { 444e14bb325SJeff Bonwick if (zio->io_child_error[c] != 0 && zio->io_error == 0) 445e14bb325SJeff Bonwick zio->io_error = zio->io_child_error[c]; 446e14bb325SJeff Bonwick } 447e14bb325SJeff Bonwick 448fa9e4066Sahrens /* 449fa9e4066Sahrens * ========================================================================== 450e14bb325SJeff Bonwick * Create the various types of I/O (read, write, free, etc) 451fa9e4066Sahrens * ========================================================================== 452fa9e4066Sahrens */ 453fa9e4066Sahrens static zio_t * 454fa9e4066Sahrens zio_create(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 455fa9e4066Sahrens void *data, uint64_t size, zio_done_func_t *done, void *private, 456e14bb325SJeff Bonwick zio_type_t type, int priority, int flags, vdev_t *vd, uint64_t offset, 457e14bb325SJeff Bonwick const zbookmark_t *zb, uint8_t stage, uint32_t pipeline) 458fa9e4066Sahrens { 459fa9e4066Sahrens zio_t *zio; 460fa9e4066Sahrens 461fa9e4066Sahrens ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); 462fa9e4066Sahrens ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); 463e14bb325SJeff Bonwick ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); 464fa9e4066Sahrens 465e14bb325SJeff Bonwick ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); 466e14bb325SJeff Bonwick ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); 467e14bb325SJeff Bonwick ASSERT(vd || stage == ZIO_STAGE_OPEN); 468088f3894Sahrens 469ccae0b50Seschrock zio = kmem_cache_alloc(zio_cache, KM_SLEEP); 470ccae0b50Seschrock bzero(zio, sizeof (zio_t)); 471e14bb325SJeff Bonwick 472e14bb325SJeff Bonwick mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); 473e14bb325SJeff Bonwick cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); 474e14bb325SJeff Bonwick 475a3f829aeSBill Moore list_create(&zio->io_parent_list, sizeof (zio_link_t), 476a3f829aeSBill Moore offsetof(zio_link_t, zl_parent_node)); 477a3f829aeSBill Moore list_create(&zio->io_child_list, sizeof (zio_link_t), 478a3f829aeSBill Moore offsetof(zio_link_t, zl_child_node)); 479a3f829aeSBill Moore 480e14bb325SJeff Bonwick if (vd != NULL) 481e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_VDEV; 482e14bb325SJeff Bonwick else if (flags & ZIO_FLAG_GANG_CHILD) 483e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_GANG; 484e14bb325SJeff Bonwick else 485e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_LOGICAL; 486e14bb325SJeff Bonwick 487fa9e4066Sahrens if (bp != NULL) { 488fa9e4066Sahrens zio->io_bp = bp; 489fa9e4066Sahrens zio->io_bp_copy = *bp; 490fa9e4066Sahrens zio->io_bp_orig = *bp; 491e14bb325SJeff Bonwick if (type != ZIO_TYPE_WRITE) 492e14bb325SJeff Bonwick zio->io_bp = &zio->io_bp_copy; /* so caller can free */ 493f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL) 494e14bb325SJeff Bonwick zio->io_logical = zio; 495f5383399SBill Moore if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) 496f5383399SBill Moore pipeline |= ZIO_GANG_STAGES; 497fa9e4066Sahrens } 498e14bb325SJeff Bonwick 499e14bb325SJeff Bonwick zio->io_spa = spa; 500e14bb325SJeff Bonwick zio->io_txg = txg; 501e14bb325SJeff Bonwick zio->io_data = data; 502e14bb325SJeff Bonwick zio->io_size = size; 503fa9e4066Sahrens zio->io_done = done; 504fa9e4066Sahrens zio->io_private = private; 505fa9e4066Sahrens zio->io_type = type; 506fa9e4066Sahrens zio->io_priority = priority; 507e14bb325SJeff Bonwick zio->io_vd = vd; 508e14bb325SJeff Bonwick zio->io_offset = offset; 509e14bb325SJeff Bonwick zio->io_orig_flags = zio->io_flags = flags; 510e14bb325SJeff Bonwick zio->io_orig_stage = zio->io_stage = stage; 511e14bb325SJeff Bonwick zio->io_orig_pipeline = zio->io_pipeline = pipeline; 512fa9e4066Sahrens 513a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); 514a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); 515a3f829aeSBill Moore 516e14bb325SJeff Bonwick if (zb != NULL) 517e14bb325SJeff Bonwick zio->io_bookmark = *zb; 518e14bb325SJeff Bonwick 519e14bb325SJeff Bonwick if (pio != NULL) { 520e14bb325SJeff Bonwick if (zio->io_logical == NULL) 521ea8dc4b6Seschrock zio->io_logical = pio->io_logical; 522f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_GANG) 523f5383399SBill Moore zio->io_gang_leader = pio->io_gang_leader; 524e14bb325SJeff Bonwick zio_add_child(pio, zio); 525fa9e4066Sahrens } 526fa9e4066Sahrens 527fa9e4066Sahrens return (zio); 528fa9e4066Sahrens } 529fa9e4066Sahrens 5300a4e9518Sgw static void 531e14bb325SJeff Bonwick zio_destroy(zio_t *zio) 5320a4e9518Sgw { 533a3f829aeSBill Moore list_destroy(&zio->io_parent_list); 534a3f829aeSBill Moore list_destroy(&zio->io_child_list); 535e14bb325SJeff Bonwick mutex_destroy(&zio->io_lock); 536e14bb325SJeff Bonwick cv_destroy(&zio->io_cv); 537e14bb325SJeff Bonwick kmem_cache_free(zio_cache, zio); 5380a4e9518Sgw } 5390a4e9518Sgw 540fa9e4066Sahrens zio_t * 541a3f829aeSBill Moore zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, 542a3f829aeSBill Moore void *private, int flags) 543fa9e4066Sahrens { 544fa9e4066Sahrens zio_t *zio; 545fa9e4066Sahrens 546fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 547a3f829aeSBill Moore ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 548e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); 549fa9e4066Sahrens 550fa9e4066Sahrens return (zio); 551fa9e4066Sahrens } 552fa9e4066Sahrens 553fa9e4066Sahrens zio_t * 554fa9e4066Sahrens zio_root(spa_t *spa, zio_done_func_t *done, void *private, int flags) 555fa9e4066Sahrens { 556a3f829aeSBill Moore return (zio_null(NULL, spa, NULL, done, private, flags)); 557fa9e4066Sahrens } 558fa9e4066Sahrens 559fa9e4066Sahrens zio_t * 560e14bb325SJeff Bonwick zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 561e14bb325SJeff Bonwick void *data, uint64_t size, zio_done_func_t *done, void *private, 562088f3894Sahrens int priority, int flags, const zbookmark_t *zb) 563fa9e4066Sahrens { 564fa9e4066Sahrens zio_t *zio; 565fa9e4066Sahrens 566088f3894Sahrens zio = zio_create(pio, spa, bp->blk_birth, (blkptr_t *)bp, 567088f3894Sahrens data, size, done, private, 568e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, NULL, 0, zb, 569faafa6e3Sahrens ZIO_STAGE_OPEN, ZIO_READ_PIPELINE); 570fa9e4066Sahrens 571fa9e4066Sahrens return (zio); 572fa9e4066Sahrens } 573fa9e4066Sahrens 57482c9918fSTim Haley void 57582c9918fSTim Haley zio_skip_write(zio_t *zio) 57682c9918fSTim Haley { 57782c9918fSTim Haley ASSERT(zio->io_type == ZIO_TYPE_WRITE); 57882c9918fSTim Haley ASSERT(zio->io_stage == ZIO_STAGE_READY); 57982c9918fSTim Haley ASSERT(!BP_IS_GANG(zio->io_bp)); 58082c9918fSTim Haley 58182c9918fSTim Haley zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 58282c9918fSTim Haley } 58382c9918fSTim Haley 584fa9e4066Sahrens zio_t * 585e14bb325SJeff Bonwick zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 586e14bb325SJeff Bonwick void *data, uint64_t size, zio_prop_t *zp, 587e14bb325SJeff Bonwick zio_done_func_t *ready, zio_done_func_t *done, void *private, 588e14bb325SJeff Bonwick int priority, int flags, const zbookmark_t *zb) 589fa9e4066Sahrens { 590fa9e4066Sahrens zio_t *zio; 591fa9e4066Sahrens 592e14bb325SJeff Bonwick ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && 593e14bb325SJeff Bonwick zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && 594e14bb325SJeff Bonwick zp->zp_compress >= ZIO_COMPRESS_OFF && 595e14bb325SJeff Bonwick zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && 596e14bb325SJeff Bonwick zp->zp_type < DMU_OT_NUMTYPES && 597e14bb325SJeff Bonwick zp->zp_level < 32 && 598e14bb325SJeff Bonwick zp->zp_ndvas > 0 && 599e14bb325SJeff Bonwick zp->zp_ndvas <= spa_max_replication(spa)); 600e14bb325SJeff Bonwick ASSERT(ready != NULL); 6010a4e9518Sgw 602fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 603e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 604fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PIPELINE); 605fa9e4066Sahrens 606c717a561Smaybee zio->io_ready = ready; 607e14bb325SJeff Bonwick zio->io_prop = *zp; 608fa9e4066Sahrens 609fa9e4066Sahrens return (zio); 610fa9e4066Sahrens } 611fa9e4066Sahrens 612fa9e4066Sahrens zio_t * 613e14bb325SJeff Bonwick zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, 614e14bb325SJeff Bonwick uint64_t size, zio_done_func_t *done, void *private, int priority, 615e14bb325SJeff Bonwick int flags, zbookmark_t *zb) 616fa9e4066Sahrens { 617fa9e4066Sahrens zio_t *zio; 618fa9e4066Sahrens 619fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 620e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 621e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); 622fa9e4066Sahrens 623fa9e4066Sahrens return (zio); 624fa9e4066Sahrens } 625fa9e4066Sahrens 626fa9e4066Sahrens zio_t * 627fa9e4066Sahrens zio_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 628e14bb325SJeff Bonwick zio_done_func_t *done, void *private, int flags) 629fa9e4066Sahrens { 630fa9e4066Sahrens zio_t *zio; 631fa9e4066Sahrens 632fa9e4066Sahrens ASSERT(!BP_IS_HOLE(bp)); 633fa9e4066Sahrens 634e14bb325SJeff Bonwick if (bp->blk_fill == BLK_FILL_ALREADY_FREED) 635a3f829aeSBill Moore return (zio_null(pio, spa, NULL, NULL, NULL, flags)); 636e14bb325SJeff Bonwick 637fa9e4066Sahrens if (txg == spa->spa_syncing_txg && 638e14bb325SJeff Bonwick spa_sync_pass(spa) > SYNC_PASS_DEFERRED_FREE) { 639fa9e4066Sahrens bplist_enqueue_deferred(&spa->spa_sync_bplist, bp); 640a3f829aeSBill Moore return (zio_null(pio, spa, NULL, NULL, NULL, flags)); 641fa9e4066Sahrens } 642fa9e4066Sahrens 643e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 644e14bb325SJeff Bonwick done, private, ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, flags, 645e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_FREE_PIPELINE); 646fa9e4066Sahrens 647fa9e4066Sahrens return (zio); 648fa9e4066Sahrens } 649fa9e4066Sahrens 650fa9e4066Sahrens zio_t * 651fa9e4066Sahrens zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 652e14bb325SJeff Bonwick zio_done_func_t *done, void *private, int flags) 653fa9e4066Sahrens { 654fa9e4066Sahrens zio_t *zio; 655fa9e4066Sahrens 656fa9e4066Sahrens /* 657fa9e4066Sahrens * A claim is an allocation of a specific block. Claims are needed 658fa9e4066Sahrens * to support immediate writes in the intent log. The issue is that 659fa9e4066Sahrens * immediate writes contain committed data, but in a txg that was 660fa9e4066Sahrens * *not* committed. Upon opening the pool after an unclean shutdown, 661fa9e4066Sahrens * the intent log claims all blocks that contain immediate write data 662fa9e4066Sahrens * so that the SPA knows they're in use. 663fa9e4066Sahrens * 664fa9e4066Sahrens * All claims *must* be resolved in the first txg -- before the SPA 665fa9e4066Sahrens * starts allocating blocks -- so that nothing is allocated twice. 666fa9e4066Sahrens */ 667fa9e4066Sahrens ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); 668fa9e4066Sahrens ASSERT3U(spa_first_txg(spa), <=, txg); 669fa9e4066Sahrens 670e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 671e14bb325SJeff Bonwick done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, 672e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); 673fa9e4066Sahrens 674fa9e4066Sahrens return (zio); 675fa9e4066Sahrens } 676fa9e4066Sahrens 677fa9e4066Sahrens zio_t * 678fa9e4066Sahrens zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 679fa9e4066Sahrens zio_done_func_t *done, void *private, int priority, int flags) 680fa9e4066Sahrens { 681fa9e4066Sahrens zio_t *zio; 682fa9e4066Sahrens int c; 683fa9e4066Sahrens 684fa9e4066Sahrens if (vd->vdev_children == 0) { 685fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 686e14bb325SJeff Bonwick ZIO_TYPE_IOCTL, priority, flags, vd, 0, NULL, 687fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); 688fa9e4066Sahrens 689fa9e4066Sahrens zio->io_cmd = cmd; 690fa9e4066Sahrens } else { 691a3f829aeSBill Moore zio = zio_null(pio, spa, NULL, NULL, NULL, flags); 692fa9e4066Sahrens 693fa9e4066Sahrens for (c = 0; c < vd->vdev_children; c++) 694fa9e4066Sahrens zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, 695fa9e4066Sahrens done, private, priority, flags)); 696fa9e4066Sahrens } 697fa9e4066Sahrens 698fa9e4066Sahrens return (zio); 699fa9e4066Sahrens } 700fa9e4066Sahrens 701fa9e4066Sahrens zio_t * 702fa9e4066Sahrens zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 703fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 704fa94a07fSbrendan int priority, int flags, boolean_t labels) 705fa9e4066Sahrens { 706fa9e4066Sahrens zio_t *zio; 7070a4e9518Sgw 708e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 709e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 710e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 711e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 712fa9e4066Sahrens 713e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 714e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, vd, offset, NULL, 715fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); 716fa9e4066Sahrens 717e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 718fa9e4066Sahrens 719fa9e4066Sahrens return (zio); 720fa9e4066Sahrens } 721fa9e4066Sahrens 722fa9e4066Sahrens zio_t * 723fa9e4066Sahrens zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 724fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 725fa94a07fSbrendan int priority, int flags, boolean_t labels) 726fa9e4066Sahrens { 727fa9e4066Sahrens zio_t *zio; 7280a4e9518Sgw 729e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 730e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 731e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 732e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 733fa9e4066Sahrens 734e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 735e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL, 736fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); 737fa9e4066Sahrens 738e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 739fa9e4066Sahrens 740fa9e4066Sahrens if (zio_checksum_table[checksum].ci_zbt) { 741fa9e4066Sahrens /* 742fa9e4066Sahrens * zbt checksums are necessarily destructive -- they modify 743e14bb325SJeff Bonwick * the end of the write buffer to hold the verifier/checksum. 744fa9e4066Sahrens * Therefore, we must make a local copy in case the data is 745e14bb325SJeff Bonwick * being written to multiple places in parallel. 746fa9e4066Sahrens */ 747e14bb325SJeff Bonwick void *wbuf = zio_buf_alloc(size); 748fa9e4066Sahrens bcopy(data, wbuf, size); 749e14bb325SJeff Bonwick zio_push_transform(zio, wbuf, size, size, NULL); 750fa9e4066Sahrens } 751fa9e4066Sahrens 752fa9e4066Sahrens return (zio); 753fa9e4066Sahrens } 754fa9e4066Sahrens 755fa9e4066Sahrens /* 756e14bb325SJeff Bonwick * Create a child I/O to do some work for us. 757fa9e4066Sahrens */ 758fa9e4066Sahrens zio_t * 759e14bb325SJeff Bonwick zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, 760fa9e4066Sahrens void *data, uint64_t size, int type, int priority, int flags, 761fa9e4066Sahrens zio_done_func_t *done, void *private) 762fa9e4066Sahrens { 763fa9e4066Sahrens uint32_t pipeline = ZIO_VDEV_CHILD_PIPELINE; 764e14bb325SJeff Bonwick zio_t *zio; 765e14bb325SJeff Bonwick 766e14bb325SJeff Bonwick ASSERT(vd->vdev_parent == 767e14bb325SJeff Bonwick (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); 768fa9e4066Sahrens 769fa9e4066Sahrens if (type == ZIO_TYPE_READ && bp != NULL) { 770fa9e4066Sahrens /* 771fa9e4066Sahrens * If we have the bp, then the child should perform the 772fa9e4066Sahrens * checksum and the parent need not. This pushes error 773fa9e4066Sahrens * detection as close to the leaves as possible and 774fa9e4066Sahrens * eliminates redundant checksums in the interior nodes. 775fa9e4066Sahrens */ 776fa9e4066Sahrens pipeline |= 1U << ZIO_STAGE_CHECKSUM_VERIFY; 777e14bb325SJeff Bonwick pio->io_pipeline &= ~(1U << ZIO_STAGE_CHECKSUM_VERIFY); 778fa9e4066Sahrens } 779fa9e4066Sahrens 780e14bb325SJeff Bonwick if (vd->vdev_children == 0) 781e14bb325SJeff Bonwick offset += VDEV_LABEL_START_SIZE; 782e14bb325SJeff Bonwick 783e14bb325SJeff Bonwick zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, 784fa9e4066Sahrens done, private, type, priority, 785e14bb325SJeff Bonwick (pio->io_flags & ZIO_FLAG_VDEV_INHERIT) | 786e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | flags, 787e14bb325SJeff Bonwick vd, offset, &pio->io_bookmark, 78844cd46caSbillm ZIO_STAGE_VDEV_IO_START - 1, pipeline); 789fa9e4066Sahrens 790e14bb325SJeff Bonwick return (zio); 79132b87932Sek } 79232b87932Sek 793e14bb325SJeff Bonwick zio_t * 794e14bb325SJeff Bonwick zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, 795e14bb325SJeff Bonwick int type, int priority, int flags, zio_done_func_t *done, void *private) 796fa9e4066Sahrens { 797e14bb325SJeff Bonwick zio_t *zio; 798fa9e4066Sahrens 799e14bb325SJeff Bonwick ASSERT(vd->vdev_ops->vdev_op_leaf); 800fa9e4066Sahrens 801e14bb325SJeff Bonwick zio = zio_create(NULL, vd->vdev_spa, 0, NULL, 802e14bb325SJeff Bonwick data, size, done, private, type, priority, 803e14bb325SJeff Bonwick flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY, 804e14bb325SJeff Bonwick vd, offset, NULL, 805e14bb325SJeff Bonwick ZIO_STAGE_VDEV_IO_START - 1, ZIO_VDEV_CHILD_PIPELINE); 806fa9e4066Sahrens 807e14bb325SJeff Bonwick return (zio); 808e05725b1Sbonwick } 809e05725b1Sbonwick 810e05725b1Sbonwick void 811e14bb325SJeff Bonwick zio_flush(zio_t *zio, vdev_t *vd) 812e05725b1Sbonwick { 813e14bb325SJeff Bonwick zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, 814e14bb325SJeff Bonwick NULL, NULL, ZIO_PRIORITY_NOW, 815e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); 816fa9e4066Sahrens } 817fa9e4066Sahrens 818fa9e4066Sahrens /* 819fa9e4066Sahrens * ========================================================================== 820e14bb325SJeff Bonwick * Prepare to read and write logical blocks 821fa9e4066Sahrens * ========================================================================== 822fa9e4066Sahrens */ 823e14bb325SJeff Bonwick 824e05725b1Sbonwick static int 825e14bb325SJeff Bonwick zio_read_bp_init(zio_t *zio) 826fa9e4066Sahrens { 827e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 828e05725b1Sbonwick 82903361682SJeff Bonwick if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && 830f5383399SBill Moore zio->io_child_type == ZIO_CHILD_LOGICAL && 831f5383399SBill Moore !(zio->io_flags & ZIO_FLAG_RAW)) { 832e14bb325SJeff Bonwick uint64_t csize = BP_GET_PSIZE(bp); 833e14bb325SJeff Bonwick void *cbuf = zio_buf_alloc(csize); 834e05725b1Sbonwick 835e14bb325SJeff Bonwick zio_push_transform(zio, cbuf, csize, csize, zio_decompress); 836e14bb325SJeff Bonwick } 837fa9e4066Sahrens 838e14bb325SJeff Bonwick if (!dmu_ot[BP_GET_TYPE(bp)].ot_metadata && BP_GET_LEVEL(bp) == 0) 839e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 840fa9e4066Sahrens 841e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 842fa9e4066Sahrens } 843fa9e4066Sahrens 844e05725b1Sbonwick static int 845e14bb325SJeff Bonwick zio_write_bp_init(zio_t *zio) 8460a4e9518Sgw { 847e14bb325SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 848e14bb325SJeff Bonwick int compress = zp->zp_compress; 849e05725b1Sbonwick blkptr_t *bp = zio->io_bp; 850e14bb325SJeff Bonwick void *cbuf; 851e14bb325SJeff Bonwick uint64_t lsize = zio->io_size; 852e14bb325SJeff Bonwick uint64_t csize = lsize; 853e14bb325SJeff Bonwick uint64_t cbufsize = 0; 854e14bb325SJeff Bonwick int pass = 1; 855e05725b1Sbonwick 856e14bb325SJeff Bonwick /* 857e14bb325SJeff Bonwick * If our children haven't all reached the ready stage, 858e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 859e14bb325SJeff Bonwick */ 860e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 861e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) 862e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 8630a4e9518Sgw 864e14bb325SJeff Bonwick if (!IO_IS_ALLOCATING(zio)) 865e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 8660a4e9518Sgw 867e14bb325SJeff Bonwick ASSERT(compress != ZIO_COMPRESS_INHERIT); 8680a4e9518Sgw 869e14bb325SJeff Bonwick if (bp->blk_birth == zio->io_txg) { 870e14bb325SJeff Bonwick /* 871e14bb325SJeff Bonwick * We're rewriting an existing block, which means we're 872e14bb325SJeff Bonwick * working on behalf of spa_sync(). For spa_sync() to 873e14bb325SJeff Bonwick * converge, it must eventually be the case that we don't 874e14bb325SJeff Bonwick * have to allocate new blocks. But compression changes 875e14bb325SJeff Bonwick * the blocksize, which forces a reallocate, and makes 876e14bb325SJeff Bonwick * convergence take longer. Therefore, after the first 877e14bb325SJeff Bonwick * few passes, stop compressing to ensure convergence. 878e14bb325SJeff Bonwick */ 879e14bb325SJeff Bonwick pass = spa_sync_pass(zio->io_spa); 880e05725b1Sbonwick 881e14bb325SJeff Bonwick if (pass > SYNC_PASS_DONT_COMPRESS) 882e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 883e05725b1Sbonwick 884e14bb325SJeff Bonwick /* Make sure someone doesn't change their mind on overwrites */ 885e14bb325SJeff Bonwick ASSERT(MIN(zp->zp_ndvas + BP_IS_GANG(bp), 886e14bb325SJeff Bonwick spa_max_replication(zio->io_spa)) == BP_GET_NDVAS(bp)); 887e14bb325SJeff Bonwick } 888fa9e4066Sahrens 889e14bb325SJeff Bonwick if (compress != ZIO_COMPRESS_OFF) { 890e14bb325SJeff Bonwick if (!zio_compress_data(compress, zio->io_data, zio->io_size, 891e14bb325SJeff Bonwick &cbuf, &csize, &cbufsize)) { 892e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 893e14bb325SJeff Bonwick } else if (csize != 0) { 894e14bb325SJeff Bonwick zio_push_transform(zio, cbuf, csize, cbufsize, NULL); 895e14bb325SJeff Bonwick } 896e14bb325SJeff Bonwick } 897c717a561Smaybee 898e14bb325SJeff Bonwick /* 899e14bb325SJeff Bonwick * The final pass of spa_sync() must be all rewrites, but the first 900e14bb325SJeff Bonwick * few passes offer a trade-off: allocating blocks defers convergence, 901e14bb325SJeff Bonwick * but newly allocated blocks are sequential, so they can be written 902e14bb325SJeff Bonwick * to disk faster. Therefore, we allow the first few passes of 903e14bb325SJeff Bonwick * spa_sync() to allocate new blocks, but force rewrites after that. 904e14bb325SJeff Bonwick * There should only be a handful of blocks after pass 1 in any case. 905e14bb325SJeff Bonwick */ 906e14bb325SJeff Bonwick if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == csize && 907e14bb325SJeff Bonwick pass > SYNC_PASS_REWRITE) { 908e14bb325SJeff Bonwick ASSERT(csize != 0); 909e14bb325SJeff Bonwick uint32_t gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; 910e14bb325SJeff Bonwick zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; 911e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_REWRITE; 912e14bb325SJeff Bonwick } else { 913e14bb325SJeff Bonwick BP_ZERO(bp); 914e14bb325SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 915e14bb325SJeff Bonwick } 916fa9e4066Sahrens 917e14bb325SJeff Bonwick if (csize == 0) { 918e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 919e14bb325SJeff Bonwick } else { 920e14bb325SJeff Bonwick ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); 921e14bb325SJeff Bonwick BP_SET_LSIZE(bp, lsize); 922e14bb325SJeff Bonwick BP_SET_PSIZE(bp, csize); 923e14bb325SJeff Bonwick BP_SET_COMPRESS(bp, compress); 924e14bb325SJeff Bonwick BP_SET_CHECKSUM(bp, zp->zp_checksum); 925e14bb325SJeff Bonwick BP_SET_TYPE(bp, zp->zp_type); 926e14bb325SJeff Bonwick BP_SET_LEVEL(bp, zp->zp_level); 927e14bb325SJeff Bonwick BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 928e14bb325SJeff Bonwick } 929fa9e4066Sahrens 930e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 931fa9e4066Sahrens } 932fa9e4066Sahrens 933e14bb325SJeff Bonwick /* 934e14bb325SJeff Bonwick * ========================================================================== 935e14bb325SJeff Bonwick * Execute the I/O pipeline 936e14bb325SJeff Bonwick * ========================================================================== 937e14bb325SJeff Bonwick */ 938e14bb325SJeff Bonwick 939e14bb325SJeff Bonwick static void 940e14bb325SJeff Bonwick zio_taskq_dispatch(zio_t *zio, enum zio_taskq_type q) 941fa9e4066Sahrens { 942e14bb325SJeff Bonwick zio_type_t t = zio->io_type; 9430a4e9518Sgw 9440a4e9518Sgw /* 945e14bb325SJeff Bonwick * If we're a config writer, the normal issue and interrupt threads 946e14bb325SJeff Bonwick * may all be blocked waiting for the config lock. In this case, 947e14bb325SJeff Bonwick * select the otherwise-unused taskq for ZIO_TYPE_NULL. 9480a4e9518Sgw */ 949e14bb325SJeff Bonwick if (zio->io_flags & ZIO_FLAG_CONFIG_WRITER) 950e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 9510a4e9518Sgw 9520a4e9518Sgw /* 953e14bb325SJeff Bonwick * A similar issue exists for the L2ARC write thread until L2ARC 2.0. 9540a4e9518Sgw */ 955e14bb325SJeff Bonwick if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) 956e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 9570a4e9518Sgw 958e14bb325SJeff Bonwick (void) taskq_dispatch(zio->io_spa->spa_zio_taskq[t][q], 959e14bb325SJeff Bonwick (task_func_t *)zio_execute, zio, TQ_SLEEP); 960e14bb325SJeff Bonwick } 9610a4e9518Sgw 962e14bb325SJeff Bonwick static boolean_t 963e14bb325SJeff Bonwick zio_taskq_member(zio_t *zio, enum zio_taskq_type q) 964e14bb325SJeff Bonwick { 965e14bb325SJeff Bonwick kthread_t *executor = zio->io_executor; 966e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 9670a4e9518Sgw 968e14bb325SJeff Bonwick for (zio_type_t t = 0; t < ZIO_TYPES; t++) 969e14bb325SJeff Bonwick if (taskq_member(spa->spa_zio_taskq[t][q], executor)) 970e14bb325SJeff Bonwick return (B_TRUE); 9710a4e9518Sgw 972e14bb325SJeff Bonwick return (B_FALSE); 973e14bb325SJeff Bonwick } 974e05725b1Sbonwick 975e14bb325SJeff Bonwick static int 976e14bb325SJeff Bonwick zio_issue_async(zio_t *zio) 977e14bb325SJeff Bonwick { 978e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 979e14bb325SJeff Bonwick 980e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 9810a4e9518Sgw } 9820a4e9518Sgw 983e14bb325SJeff Bonwick void 984e14bb325SJeff Bonwick zio_interrupt(zio_t *zio) 9850a4e9518Sgw { 986e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT); 987e14bb325SJeff Bonwick } 9880a4e9518Sgw 989e14bb325SJeff Bonwick /* 990e14bb325SJeff Bonwick * Execute the I/O pipeline until one of the following occurs: 991e14bb325SJeff Bonwick * (1) the I/O completes; (2) the pipeline stalls waiting for 992e14bb325SJeff Bonwick * dependent child I/Os; (3) the I/O issues, so we're waiting 993e14bb325SJeff Bonwick * for an I/O completion interrupt; (4) the I/O is delegated by 994e14bb325SJeff Bonwick * vdev-level caching or aggregation; (5) the I/O is deferred 995e14bb325SJeff Bonwick * due to vdev-level queueing; (6) the I/O is handed off to 996e14bb325SJeff Bonwick * another thread. In all cases, the pipeline stops whenever 997e14bb325SJeff Bonwick * there's no CPU work; it never burns a thread in cv_wait(). 998e14bb325SJeff Bonwick * 999e14bb325SJeff Bonwick * There's no locking on io_stage because there's no legitimate way 1000e14bb325SJeff Bonwick * for multiple threads to be attempting to process the same I/O. 1001e14bb325SJeff Bonwick */ 1002e14bb325SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[ZIO_STAGES]; 10030a4e9518Sgw 1004e14bb325SJeff Bonwick void 1005e14bb325SJeff Bonwick zio_execute(zio_t *zio) 1006e14bb325SJeff Bonwick { 1007e14bb325SJeff Bonwick zio->io_executor = curthread; 10080a4e9518Sgw 1009e14bb325SJeff Bonwick while (zio->io_stage < ZIO_STAGE_DONE) { 1010e14bb325SJeff Bonwick uint32_t pipeline = zio->io_pipeline; 1011e14bb325SJeff Bonwick zio_stage_t stage = zio->io_stage; 1012e14bb325SJeff Bonwick int rv; 10130a4e9518Sgw 1014e14bb325SJeff Bonwick ASSERT(!MUTEX_HELD(&zio->io_lock)); 10150a4e9518Sgw 1016e14bb325SJeff Bonwick while (((1U << ++stage) & pipeline) == 0) 1017e14bb325SJeff Bonwick continue; 1018e14bb325SJeff Bonwick 1019e14bb325SJeff Bonwick ASSERT(stage <= ZIO_STAGE_DONE); 1020e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 10210a4e9518Sgw 10220a4e9518Sgw /* 1023e14bb325SJeff Bonwick * If we are in interrupt context and this pipeline stage 1024e14bb325SJeff Bonwick * will grab a config lock that is held across I/O, 1025e14bb325SJeff Bonwick * issue async to avoid deadlock. 10260a4e9518Sgw */ 1027e14bb325SJeff Bonwick if (((1U << stage) & ZIO_CONFIG_LOCK_BLOCKING_STAGES) && 1028e14bb325SJeff Bonwick zio->io_vd == NULL && 1029e14bb325SJeff Bonwick zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { 1030e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 1031e14bb325SJeff Bonwick return; 10320a4e9518Sgw } 10330a4e9518Sgw 1034e14bb325SJeff Bonwick zio->io_stage = stage; 1035e14bb325SJeff Bonwick rv = zio_pipeline[stage](zio); 10360a4e9518Sgw 1037e14bb325SJeff Bonwick if (rv == ZIO_PIPELINE_STOP) 1038e14bb325SJeff Bonwick return; 10390a4e9518Sgw 1040e14bb325SJeff Bonwick ASSERT(rv == ZIO_PIPELINE_CONTINUE); 1041e14bb325SJeff Bonwick } 10420a4e9518Sgw } 10430a4e9518Sgw 1044e14bb325SJeff Bonwick /* 1045e14bb325SJeff Bonwick * ========================================================================== 1046e14bb325SJeff Bonwick * Initiate I/O, either sync or async 1047e14bb325SJeff Bonwick * ========================================================================== 1048e14bb325SJeff Bonwick */ 1049e14bb325SJeff Bonwick int 1050e14bb325SJeff Bonwick zio_wait(zio_t *zio) 10510a4e9518Sgw { 1052e14bb325SJeff Bonwick int error; 10530a4e9518Sgw 1054e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 1055e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 10560a4e9518Sgw 1057e14bb325SJeff Bonwick zio->io_waiter = curthread; 1058e05725b1Sbonwick 1059e14bb325SJeff Bonwick zio_execute(zio); 10600a4e9518Sgw 1061e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 1062e14bb325SJeff Bonwick while (zio->io_executor != NULL) 1063e14bb325SJeff Bonwick cv_wait(&zio->io_cv, &zio->io_lock); 1064e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 106532b87932Sek 1066e14bb325SJeff Bonwick error = zio->io_error; 1067e14bb325SJeff Bonwick zio_destroy(zio); 106832b87932Sek 1069e14bb325SJeff Bonwick return (error); 107032b87932Sek } 107132b87932Sek 1072e14bb325SJeff Bonwick void 1073e14bb325SJeff Bonwick zio_nowait(zio_t *zio) 10740a4e9518Sgw { 1075e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 1076fa9e4066Sahrens 1077a3f829aeSBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL && 1078a3f829aeSBill Moore zio_unique_parent(zio) == NULL) { 1079ea8dc4b6Seschrock /* 1080e14bb325SJeff Bonwick * This is a logical async I/O with no parent to wait for it. 108154d692b7SGeorge Wilson * We add it to the spa_async_root_zio "Godfather" I/O which 108254d692b7SGeorge Wilson * will ensure they complete prior to unloading the pool. 1083ea8dc4b6Seschrock */ 1084e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 108554d692b7SGeorge Wilson 108654d692b7SGeorge Wilson zio_add_child(spa->spa_async_zio_root, zio); 1087e14bb325SJeff Bonwick } 1088ea8dc4b6Seschrock 1089e14bb325SJeff Bonwick zio_execute(zio); 1090e14bb325SJeff Bonwick } 1091ea8dc4b6Seschrock 1092e14bb325SJeff Bonwick /* 1093e14bb325SJeff Bonwick * ========================================================================== 1094e14bb325SJeff Bonwick * Reexecute or suspend/resume failed I/O 1095e14bb325SJeff Bonwick * ========================================================================== 1096e14bb325SJeff Bonwick */ 1097fa9e4066Sahrens 1098e14bb325SJeff Bonwick static void 1099e14bb325SJeff Bonwick zio_reexecute(zio_t *pio) 1100e14bb325SJeff Bonwick { 1101a3f829aeSBill Moore zio_t *cio, *cio_next; 1102a3f829aeSBill Moore 1103a3f829aeSBill Moore ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); 1104a3f829aeSBill Moore ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); 1105f5383399SBill Moore ASSERT(pio->io_gang_leader == NULL); 1106f5383399SBill Moore ASSERT(pio->io_gang_tree == NULL); 1107e05725b1Sbonwick 1108e14bb325SJeff Bonwick pio->io_flags = pio->io_orig_flags; 1109e14bb325SJeff Bonwick pio->io_stage = pio->io_orig_stage; 1110e14bb325SJeff Bonwick pio->io_pipeline = pio->io_orig_pipeline; 1111e14bb325SJeff Bonwick pio->io_reexecute = 0; 1112e14bb325SJeff Bonwick pio->io_error = 0; 1113a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1114a3f829aeSBill Moore pio->io_state[w] = 0; 1115e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 1116e14bb325SJeff Bonwick pio->io_child_error[c] = 0; 11170a4e9518Sgw 1118e14bb325SJeff Bonwick if (IO_IS_ALLOCATING(pio)) { 11190a4e9518Sgw /* 1120e14bb325SJeff Bonwick * Remember the failed bp so that the io_ready() callback 1121e14bb325SJeff Bonwick * can update its accounting upon reexecution. The block 1122e14bb325SJeff Bonwick * was already freed in zio_done(); we indicate this with 1123e14bb325SJeff Bonwick * a fill count of -1 so that zio_free() knows to skip it. 1124ea8dc4b6Seschrock */ 1125e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 1126e14bb325SJeff Bonwick ASSERT(bp->blk_birth == 0 || bp->blk_birth == pio->io_txg); 1127e14bb325SJeff Bonwick bp->blk_fill = BLK_FILL_ALREADY_FREED; 1128e14bb325SJeff Bonwick pio->io_bp_orig = *bp; 1129e14bb325SJeff Bonwick BP_ZERO(bp); 1130e14bb325SJeff Bonwick } 1131d58459f4Sek 1132e14bb325SJeff Bonwick /* 1133e14bb325SJeff Bonwick * As we reexecute pio's children, new children could be created. 1134a3f829aeSBill Moore * New children go to the head of pio's io_child_list, however, 1135e14bb325SJeff Bonwick * so we will (correctly) not reexecute them. The key is that 1136a3f829aeSBill Moore * the remainder of pio's io_child_list, from 'cio_next' onward, 1137a3f829aeSBill Moore * cannot be affected by any side effects of reexecuting 'cio'. 1138e14bb325SJeff Bonwick */ 1139a3f829aeSBill Moore for (cio = zio_walk_children(pio); cio != NULL; cio = cio_next) { 1140a3f829aeSBill Moore cio_next = zio_walk_children(pio); 1141e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 1142a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1143a3f829aeSBill Moore pio->io_children[cio->io_child_type][w]++; 1144e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 1145a3f829aeSBill Moore zio_reexecute(cio); 1146fa9e4066Sahrens } 1147e05725b1Sbonwick 1148e14bb325SJeff Bonwick /* 1149e14bb325SJeff Bonwick * Now that all children have been reexecuted, execute the parent. 115054d692b7SGeorge Wilson * We don't reexecute "The Godfather" I/O here as it's the 115154d692b7SGeorge Wilson * responsibility of the caller to wait on him. 1152e14bb325SJeff Bonwick */ 115354d692b7SGeorge Wilson if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) 115454d692b7SGeorge Wilson zio_execute(pio); 11550a4e9518Sgw } 11560a4e9518Sgw 1157e14bb325SJeff Bonwick void 1158e14bb325SJeff Bonwick zio_suspend(spa_t *spa, zio_t *zio) 11590a4e9518Sgw { 1160e14bb325SJeff Bonwick if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) 1161e14bb325SJeff Bonwick fm_panic("Pool '%s' has encountered an uncorrectable I/O " 1162e14bb325SJeff Bonwick "failure and the failure mode property for this pool " 1163e14bb325SJeff Bonwick "is set to panic.", spa_name(spa)); 11640a4e9518Sgw 1165e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); 11660a4e9518Sgw 1167e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1168fa9e4066Sahrens 1169e14bb325SJeff Bonwick if (spa->spa_suspend_zio_root == NULL) 117054d692b7SGeorge Wilson spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, 117154d692b7SGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 117254d692b7SGeorge Wilson ZIO_FLAG_GODFATHER); 1173fa9e4066Sahrens 1174e14bb325SJeff Bonwick spa->spa_suspended = B_TRUE; 1175fa9e4066Sahrens 1176e14bb325SJeff Bonwick if (zio != NULL) { 117754d692b7SGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 1178e14bb325SJeff Bonwick ASSERT(zio != spa->spa_suspend_zio_root); 1179e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1180a3f829aeSBill Moore ASSERT(zio_unique_parent(zio) == NULL); 1181e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_DONE); 1182e14bb325SJeff Bonwick zio_add_child(spa->spa_suspend_zio_root, zio); 1183e14bb325SJeff Bonwick } 1184fa9e4066Sahrens 1185e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1186e14bb325SJeff Bonwick } 1187fa9e4066Sahrens 118854d692b7SGeorge Wilson int 1189e14bb325SJeff Bonwick zio_resume(spa_t *spa) 1190e14bb325SJeff Bonwick { 119154d692b7SGeorge Wilson zio_t *pio; 1192fa9e4066Sahrens 1193b3995adbSahrens /* 1194e14bb325SJeff Bonwick * Reexecute all previously suspended i/o. 1195b3995adbSahrens */ 1196e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1197e14bb325SJeff Bonwick spa->spa_suspended = B_FALSE; 1198e14bb325SJeff Bonwick cv_broadcast(&spa->spa_suspend_cv); 1199e14bb325SJeff Bonwick pio = spa->spa_suspend_zio_root; 1200e14bb325SJeff Bonwick spa->spa_suspend_zio_root = NULL; 1201e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1202e14bb325SJeff Bonwick 1203e14bb325SJeff Bonwick if (pio == NULL) 120454d692b7SGeorge Wilson return (0); 1205e14bb325SJeff Bonwick 120654d692b7SGeorge Wilson zio_reexecute(pio); 120754d692b7SGeorge Wilson return (zio_wait(pio)); 1208e14bb325SJeff Bonwick } 1209e14bb325SJeff Bonwick 1210e14bb325SJeff Bonwick void 1211e14bb325SJeff Bonwick zio_resume_wait(spa_t *spa) 1212e14bb325SJeff Bonwick { 1213e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1214e14bb325SJeff Bonwick while (spa_suspended(spa)) 1215e14bb325SJeff Bonwick cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); 1216e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1217fa9e4066Sahrens } 1218fa9e4066Sahrens 1219fa9e4066Sahrens /* 1220fa9e4066Sahrens * ========================================================================== 1221e14bb325SJeff Bonwick * Gang blocks. 1222e14bb325SJeff Bonwick * 1223e14bb325SJeff Bonwick * A gang block is a collection of small blocks that looks to the DMU 1224e14bb325SJeff Bonwick * like one large block. When zio_dva_allocate() cannot find a block 1225e14bb325SJeff Bonwick * of the requested size, due to either severe fragmentation or the pool 1226e14bb325SJeff Bonwick * being nearly full, it calls zio_write_gang_block() to construct the 1227e14bb325SJeff Bonwick * block from smaller fragments. 1228e14bb325SJeff Bonwick * 1229e14bb325SJeff Bonwick * A gang block consists of a gang header (zio_gbh_phys_t) and up to 1230e14bb325SJeff Bonwick * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like 1231e14bb325SJeff Bonwick * an indirect block: it's an array of block pointers. It consumes 1232e14bb325SJeff Bonwick * only one sector and hence is allocatable regardless of fragmentation. 1233e14bb325SJeff Bonwick * The gang header's bps point to its gang members, which hold the data. 1234e14bb325SJeff Bonwick * 1235e14bb325SJeff Bonwick * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> 1236e14bb325SJeff Bonwick * as the verifier to ensure uniqueness of the SHA256 checksum. 1237e14bb325SJeff Bonwick * Critically, the gang block bp's blk_cksum is the checksum of the data, 1238e14bb325SJeff Bonwick * not the gang header. This ensures that data block signatures (needed for 1239e14bb325SJeff Bonwick * deduplication) are independent of how the block is physically stored. 1240e14bb325SJeff Bonwick * 1241e14bb325SJeff Bonwick * Gang blocks can be nested: a gang member may itself be a gang block. 1242e14bb325SJeff Bonwick * Thus every gang block is a tree in which root and all interior nodes are 1243e14bb325SJeff Bonwick * gang headers, and the leaves are normal blocks that contain user data. 1244e14bb325SJeff Bonwick * The root of the gang tree is called the gang leader. 1245e14bb325SJeff Bonwick * 1246e14bb325SJeff Bonwick * To perform any operation (read, rewrite, free, claim) on a gang block, 1247e14bb325SJeff Bonwick * zio_gang_assemble() first assembles the gang tree (minus data leaves) 1248e14bb325SJeff Bonwick * in the io_gang_tree field of the original logical i/o by recursively 1249e14bb325SJeff Bonwick * reading the gang leader and all gang headers below it. This yields 1250e14bb325SJeff Bonwick * an in-core tree containing the contents of every gang header and the 1251e14bb325SJeff Bonwick * bps for every constituent of the gang block. 1252e14bb325SJeff Bonwick * 1253e14bb325SJeff Bonwick * With the gang tree now assembled, zio_gang_issue() just walks the gang tree 1254e14bb325SJeff Bonwick * and invokes a callback on each bp. To free a gang block, zio_gang_issue() 1255e14bb325SJeff Bonwick * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. 1256e14bb325SJeff Bonwick * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). 1257e14bb325SJeff Bonwick * zio_read_gang() is a wrapper around zio_read() that omits reading gang 1258e14bb325SJeff Bonwick * headers, since we already have those in io_gang_tree. zio_rewrite_gang() 1259e14bb325SJeff Bonwick * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() 1260e14bb325SJeff Bonwick * of the gang header plus zio_checksum_compute() of the data to update the 1261e14bb325SJeff Bonwick * gang header's blk_cksum as described above. 1262e14bb325SJeff Bonwick * 1263e14bb325SJeff Bonwick * The two-phase assemble/issue model solves the problem of partial failure -- 1264e14bb325SJeff Bonwick * what if you'd freed part of a gang block but then couldn't read the 1265e14bb325SJeff Bonwick * gang header for another part? Assembling the entire gang tree first 1266e14bb325SJeff Bonwick * ensures that all the necessary gang header I/O has succeeded before 1267e14bb325SJeff Bonwick * starting the actual work of free, claim, or write. Once the gang tree 1268e14bb325SJeff Bonwick * is assembled, free and claim are in-memory operations that cannot fail. 1269e14bb325SJeff Bonwick * 1270e14bb325SJeff Bonwick * In the event that a gang write fails, zio_dva_unallocate() walks the 1271e14bb325SJeff Bonwick * gang tree to immediately free (i.e. insert back into the space map) 1272e14bb325SJeff Bonwick * everything we've allocated. This ensures that we don't get ENOSPC 1273e14bb325SJeff Bonwick * errors during repeated suspend/resume cycles due to a flaky device. 1274e14bb325SJeff Bonwick * 1275e14bb325SJeff Bonwick * Gang rewrites only happen during sync-to-convergence. If we can't assemble 1276e14bb325SJeff Bonwick * the gang tree, we won't modify the block, so we can safely defer the free 1277e14bb325SJeff Bonwick * (knowing that the block is still intact). If we *can* assemble the gang 1278e14bb325SJeff Bonwick * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free 1279e14bb325SJeff Bonwick * each constituent bp and we can allocate a new block on the next sync pass. 1280e14bb325SJeff Bonwick * 1281e14bb325SJeff Bonwick * In all cases, the gang tree allows complete recovery from partial failure. 1282fa9e4066Sahrens * ========================================================================== 1283fa9e4066Sahrens */ 1284e14bb325SJeff Bonwick 1285e14bb325SJeff Bonwick static zio_t * 1286e14bb325SJeff Bonwick zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1287fa9e4066Sahrens { 1288e14bb325SJeff Bonwick if (gn != NULL) 1289e14bb325SJeff Bonwick return (pio); 1290fa9e4066Sahrens 1291e14bb325SJeff Bonwick return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), 1292e14bb325SJeff Bonwick NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1293e14bb325SJeff Bonwick &pio->io_bookmark)); 1294e14bb325SJeff Bonwick } 1295e14bb325SJeff Bonwick 1296e14bb325SJeff Bonwick zio_t * 1297e14bb325SJeff Bonwick zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1298e14bb325SJeff Bonwick { 1299e14bb325SJeff Bonwick zio_t *zio; 1300e14bb325SJeff Bonwick 1301e14bb325SJeff Bonwick if (gn != NULL) { 1302e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1303e14bb325SJeff Bonwick gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, 1304e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1305fa9e4066Sahrens /* 1306e14bb325SJeff Bonwick * As we rewrite each gang header, the pipeline will compute 1307e14bb325SJeff Bonwick * a new gang block header checksum for it; but no one will 1308e14bb325SJeff Bonwick * compute a new data checksum, so we do that here. The one 1309e14bb325SJeff Bonwick * exception is the gang leader: the pipeline already computed 1310e14bb325SJeff Bonwick * its data checksum because that stage precedes gang assembly. 1311e14bb325SJeff Bonwick * (Presently, nothing actually uses interior data checksums; 1312e14bb325SJeff Bonwick * this is just good hygiene.) 1313fa9e4066Sahrens */ 1314f5383399SBill Moore if (gn != pio->io_gang_leader->io_gang_tree) { 1315e14bb325SJeff Bonwick zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), 1316e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp)); 1317e14bb325SJeff Bonwick } 1318fa9e4066Sahrens } else { 1319e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1320e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, 1321e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1322fa9e4066Sahrens } 1323fa9e4066Sahrens 1324e14bb325SJeff Bonwick return (zio); 1325e14bb325SJeff Bonwick } 1326fa9e4066Sahrens 1327e14bb325SJeff Bonwick /* ARGSUSED */ 1328e14bb325SJeff Bonwick zio_t * 1329e14bb325SJeff Bonwick zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1330e14bb325SJeff Bonwick { 1331e14bb325SJeff Bonwick return (zio_free(pio, pio->io_spa, pio->io_txg, bp, 1332e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 1333fa9e4066Sahrens } 1334fa9e4066Sahrens 1335e14bb325SJeff Bonwick /* ARGSUSED */ 1336e14bb325SJeff Bonwick zio_t * 1337e14bb325SJeff Bonwick zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1338fa9e4066Sahrens { 1339e14bb325SJeff Bonwick return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, 1340e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 1341e14bb325SJeff Bonwick } 1342fa9e4066Sahrens 1343e14bb325SJeff Bonwick static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { 1344e14bb325SJeff Bonwick NULL, 1345e14bb325SJeff Bonwick zio_read_gang, 1346e14bb325SJeff Bonwick zio_rewrite_gang, 1347e14bb325SJeff Bonwick zio_free_gang, 1348e14bb325SJeff Bonwick zio_claim_gang, 1349e14bb325SJeff Bonwick NULL 1350e14bb325SJeff Bonwick }; 1351fa9e4066Sahrens 1352e14bb325SJeff Bonwick static void zio_gang_tree_assemble_done(zio_t *zio); 1353fa9e4066Sahrens 1354e14bb325SJeff Bonwick static zio_gang_node_t * 1355e14bb325SJeff Bonwick zio_gang_node_alloc(zio_gang_node_t **gnpp) 1356e14bb325SJeff Bonwick { 1357e14bb325SJeff Bonwick zio_gang_node_t *gn; 1358fa9e4066Sahrens 1359e14bb325SJeff Bonwick ASSERT(*gnpp == NULL); 1360fa9e4066Sahrens 1361e14bb325SJeff Bonwick gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); 1362e14bb325SJeff Bonwick gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); 1363e14bb325SJeff Bonwick *gnpp = gn; 1364e14bb325SJeff Bonwick 1365e14bb325SJeff Bonwick return (gn); 1366fa9e4066Sahrens } 1367fa9e4066Sahrens 1368fa9e4066Sahrens static void 1369e14bb325SJeff Bonwick zio_gang_node_free(zio_gang_node_t **gnpp) 1370fa9e4066Sahrens { 1371e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1372fa9e4066Sahrens 1373e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1374e14bb325SJeff Bonwick ASSERT(gn->gn_child[g] == NULL); 1375e14bb325SJeff Bonwick 1376e14bb325SJeff Bonwick zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); 1377e14bb325SJeff Bonwick kmem_free(gn, sizeof (*gn)); 1378e14bb325SJeff Bonwick *gnpp = NULL; 1379fa9e4066Sahrens } 1380fa9e4066Sahrens 1381e14bb325SJeff Bonwick static void 1382e14bb325SJeff Bonwick zio_gang_tree_free(zio_gang_node_t **gnpp) 1383fa9e4066Sahrens { 1384e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1385fa9e4066Sahrens 1386e14bb325SJeff Bonwick if (gn == NULL) 1387e14bb325SJeff Bonwick return; 1388fa9e4066Sahrens 1389e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1390e14bb325SJeff Bonwick zio_gang_tree_free(&gn->gn_child[g]); 1391fa9e4066Sahrens 1392e14bb325SJeff Bonwick zio_gang_node_free(gnpp); 1393fa9e4066Sahrens } 1394fa9e4066Sahrens 1395e14bb325SJeff Bonwick static void 1396f5383399SBill Moore zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) 1397fa9e4066Sahrens { 1398e14bb325SJeff Bonwick zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); 1399e14bb325SJeff Bonwick 1400f5383399SBill Moore ASSERT(gio->io_gang_leader == gio); 1401e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp)); 1402fa9e4066Sahrens 1403f5383399SBill Moore zio_nowait(zio_read(gio, gio->io_spa, bp, gn->gn_gbh, 1404e14bb325SJeff Bonwick SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, 1405f5383399SBill Moore gio->io_priority, ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); 1406e14bb325SJeff Bonwick } 1407fa9e4066Sahrens 1408e14bb325SJeff Bonwick static void 1409e14bb325SJeff Bonwick zio_gang_tree_assemble_done(zio_t *zio) 1410e14bb325SJeff Bonwick { 1411f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 1412e14bb325SJeff Bonwick zio_gang_node_t *gn = zio->io_private; 1413e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1414fa9e4066Sahrens 1415f5383399SBill Moore ASSERT(gio == zio_unique_parent(zio)); 1416a3f829aeSBill Moore ASSERT(zio_walk_children(zio) == NULL); 1417fa9e4066Sahrens 1418e14bb325SJeff Bonwick if (zio->io_error) 1419e14bb325SJeff Bonwick return; 1420fa9e4066Sahrens 1421e14bb325SJeff Bonwick if (BP_SHOULD_BYTESWAP(bp)) 1422e14bb325SJeff Bonwick byteswap_uint64_array(zio->io_data, zio->io_size); 1423fa9e4066Sahrens 1424e14bb325SJeff Bonwick ASSERT(zio->io_data == gn->gn_gbh); 1425e14bb325SJeff Bonwick ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); 1426e14bb325SJeff Bonwick ASSERT(gn->gn_gbh->zg_tail.zbt_magic == ZBT_MAGIC); 1427e05725b1Sbonwick 1428e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1429e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1430e14bb325SJeff Bonwick if (!BP_IS_GANG(gbp)) 1431e14bb325SJeff Bonwick continue; 1432f5383399SBill Moore zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); 1433e14bb325SJeff Bonwick } 1434fa9e4066Sahrens } 1435fa9e4066Sahrens 1436e14bb325SJeff Bonwick static void 1437e14bb325SJeff Bonwick zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) 1438fa9e4066Sahrens { 1439f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1440e14bb325SJeff Bonwick zio_t *zio; 1441fa9e4066Sahrens 1442e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) == !!gn); 1443f5383399SBill Moore ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); 1444f5383399SBill Moore ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); 1445fa9e4066Sahrens 1446e14bb325SJeff Bonwick /* 1447e14bb325SJeff Bonwick * If you're a gang header, your data is in gn->gn_gbh. 1448e14bb325SJeff Bonwick * If you're a gang member, your data is in 'data' and gn == NULL. 1449e14bb325SJeff Bonwick */ 1450f5383399SBill Moore zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data); 1451fa9e4066Sahrens 1452e14bb325SJeff Bonwick if (gn != NULL) { 1453e14bb325SJeff Bonwick ASSERT(gn->gn_gbh->zg_tail.zbt_magic == ZBT_MAGIC); 1454fa9e4066Sahrens 1455e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1456e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1457e14bb325SJeff Bonwick if (BP_IS_HOLE(gbp)) 1458e14bb325SJeff Bonwick continue; 1459e14bb325SJeff Bonwick zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); 1460e14bb325SJeff Bonwick data = (char *)data + BP_GET_PSIZE(gbp); 1461e14bb325SJeff Bonwick } 1462fa9e4066Sahrens } 1463fa9e4066Sahrens 1464f5383399SBill Moore if (gn == gio->io_gang_tree) 1465f5383399SBill Moore ASSERT3P((char *)gio->io_data + gio->io_size, ==, data); 1466e05725b1Sbonwick 1467e14bb325SJeff Bonwick if (zio != pio) 1468e14bb325SJeff Bonwick zio_nowait(zio); 1469fa9e4066Sahrens } 1470fa9e4066Sahrens 1471e05725b1Sbonwick static int 1472e14bb325SJeff Bonwick zio_gang_assemble(zio_t *zio) 1473fa9e4066Sahrens { 1474e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1475fa9e4066Sahrens 1476f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); 1477f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1478f5383399SBill Moore 1479f5383399SBill Moore zio->io_gang_leader = zio; 1480fa9e4066Sahrens 1481e14bb325SJeff Bonwick zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); 1482e05725b1Sbonwick 1483e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1484fa9e4066Sahrens } 1485fa9e4066Sahrens 1486e05725b1Sbonwick static int 1487e14bb325SJeff Bonwick zio_gang_issue(zio_t *zio) 1488fa9e4066Sahrens { 1489e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1490fa9e4066Sahrens 1491e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) 1492e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1493fa9e4066Sahrens 1494f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); 1495f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1496fa9e4066Sahrens 1497e14bb325SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_GANG] == 0) 1498f5383399SBill Moore zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_data); 1499e14bb325SJeff Bonwick else 1500f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 1501fa9e4066Sahrens 1502e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1503e05725b1Sbonwick 1504e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1505fa9e4066Sahrens } 1506fa9e4066Sahrens 1507fa9e4066Sahrens static void 1508e14bb325SJeff Bonwick zio_write_gang_member_ready(zio_t *zio) 1509fa9e4066Sahrens { 1510a3f829aeSBill Moore zio_t *pio = zio_unique_parent(zio); 1511f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 151244cd46caSbillm dva_t *cdva = zio->io_bp->blk_dva; 151344cd46caSbillm dva_t *pdva = pio->io_bp->blk_dva; 1514fa9e4066Sahrens uint64_t asize; 1515fa9e4066Sahrens 1516e14bb325SJeff Bonwick if (BP_IS_HOLE(zio->io_bp)) 1517e14bb325SJeff Bonwick return; 1518e14bb325SJeff Bonwick 1519e14bb325SJeff Bonwick ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); 1520e14bb325SJeff Bonwick 1521e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_GANG); 1522f5383399SBill Moore ASSERT3U(zio->io_prop.zp_ndvas, ==, gio->io_prop.zp_ndvas); 1523e14bb325SJeff Bonwick ASSERT3U(zio->io_prop.zp_ndvas, <=, BP_GET_NDVAS(zio->io_bp)); 1524e14bb325SJeff Bonwick ASSERT3U(pio->io_prop.zp_ndvas, <=, BP_GET_NDVAS(pio->io_bp)); 152544cd46caSbillm ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); 1526fa9e4066Sahrens 1527fa9e4066Sahrens mutex_enter(&pio->io_lock); 1528e14bb325SJeff Bonwick for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { 152944cd46caSbillm ASSERT(DVA_GET_GANG(&pdva[d])); 153044cd46caSbillm asize = DVA_GET_ASIZE(&pdva[d]); 153144cd46caSbillm asize += DVA_GET_ASIZE(&cdva[d]); 153244cd46caSbillm DVA_SET_ASIZE(&pdva[d], asize); 153344cd46caSbillm } 1534fa9e4066Sahrens mutex_exit(&pio->io_lock); 1535fa9e4066Sahrens } 1536fa9e4066Sahrens 15370a4e9518Sgw static int 1538e14bb325SJeff Bonwick zio_write_gang_block(zio_t *pio) 1539fa9e4066Sahrens { 1540e14bb325SJeff Bonwick spa_t *spa = pio->io_spa; 1541e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 1542f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1543e14bb325SJeff Bonwick zio_t *zio; 1544e14bb325SJeff Bonwick zio_gang_node_t *gn, **gnpp; 1545fa9e4066Sahrens zio_gbh_phys_t *gbh; 1546e14bb325SJeff Bonwick uint64_t txg = pio->io_txg; 1547e14bb325SJeff Bonwick uint64_t resid = pio->io_size; 1548e14bb325SJeff Bonwick uint64_t lsize; 1549f5383399SBill Moore int ndvas = gio->io_prop.zp_ndvas; 155044cd46caSbillm int gbh_ndvas = MIN(ndvas + 1, spa_max_replication(spa)); 1551e14bb325SJeff Bonwick zio_prop_t zp; 1552fa9e4066Sahrens int error; 1553fa9e4066Sahrens 1554e14bb325SJeff Bonwick error = metaslab_alloc(spa, spa->spa_normal_class, SPA_GANGBLOCKSIZE, 1555f5383399SBill Moore bp, gbh_ndvas, txg, pio == gio ? NULL : gio->io_bp, 1556e14bb325SJeff Bonwick METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); 1557e05725b1Sbonwick if (error) { 1558e14bb325SJeff Bonwick pio->io_error = error; 1559e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1560e05725b1Sbonwick } 1561fa9e4066Sahrens 1562f5383399SBill Moore if (pio == gio) { 1563f5383399SBill Moore gnpp = &gio->io_gang_tree; 1564e14bb325SJeff Bonwick } else { 1565e14bb325SJeff Bonwick gnpp = pio->io_private; 1566e14bb325SJeff Bonwick ASSERT(pio->io_ready == zio_write_gang_member_ready); 1567fa9e4066Sahrens } 1568fa9e4066Sahrens 1569e14bb325SJeff Bonwick gn = zio_gang_node_alloc(gnpp); 1570e14bb325SJeff Bonwick gbh = gn->gn_gbh; 1571e14bb325SJeff Bonwick bzero(gbh, SPA_GANGBLOCKSIZE); 1572fa9e4066Sahrens 1573e14bb325SJeff Bonwick /* 1574e14bb325SJeff Bonwick * Create the gang header. 1575e14bb325SJeff Bonwick */ 1576e14bb325SJeff Bonwick zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, 1577e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1578fa9e4066Sahrens 1579e14bb325SJeff Bonwick /* 1580e14bb325SJeff Bonwick * Create and nowait the gang children. 1581e14bb325SJeff Bonwick */ 1582e14bb325SJeff Bonwick for (int g = 0; resid != 0; resid -= lsize, g++) { 1583e14bb325SJeff Bonwick lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), 1584e14bb325SJeff Bonwick SPA_MINBLOCKSIZE); 1585e14bb325SJeff Bonwick ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); 1586e14bb325SJeff Bonwick 1587f5383399SBill Moore zp.zp_checksum = gio->io_prop.zp_checksum; 1588e14bb325SJeff Bonwick zp.zp_compress = ZIO_COMPRESS_OFF; 1589e14bb325SJeff Bonwick zp.zp_type = DMU_OT_NONE; 1590e14bb325SJeff Bonwick zp.zp_level = 0; 1591f5383399SBill Moore zp.zp_ndvas = gio->io_prop.zp_ndvas; 1592e14bb325SJeff Bonwick 1593e14bb325SJeff Bonwick zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], 1594e14bb325SJeff Bonwick (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, 1595e14bb325SJeff Bonwick zio_write_gang_member_ready, NULL, &gn->gn_child[g], 1596e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1597e14bb325SJeff Bonwick &pio->io_bookmark)); 1598e14bb325SJeff Bonwick } 1599e05725b1Sbonwick 160044cd46caSbillm /* 1601e14bb325SJeff Bonwick * Set pio's pipeline to just wait for zio to finish. 160244cd46caSbillm */ 1603e14bb325SJeff Bonwick pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1604e14bb325SJeff Bonwick 1605e14bb325SJeff Bonwick zio_nowait(zio); 1606e14bb325SJeff Bonwick 1607e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1608fa9e4066Sahrens } 1609fa9e4066Sahrens 1610fa9e4066Sahrens /* 1611fa9e4066Sahrens * ========================================================================== 1612fa9e4066Sahrens * Allocate and free blocks 1613fa9e4066Sahrens * ========================================================================== 1614fa9e4066Sahrens */ 1615e14bb325SJeff Bonwick 1616e05725b1Sbonwick static int 1617fa9e4066Sahrens zio_dva_allocate(zio_t *zio) 1618fa9e4066Sahrens { 16198654d025Sperrin spa_t *spa = zio->io_spa; 16208654d025Sperrin metaslab_class_t *mc = spa->spa_normal_class; 1621fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 1622fa9e4066Sahrens int error; 1623fa9e4066Sahrens 1624f5383399SBill Moore if (zio->io_gang_leader == NULL) { 1625f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1626f5383399SBill Moore zio->io_gang_leader = zio; 1627f5383399SBill Moore } 1628f5383399SBill Moore 1629fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 163044cd46caSbillm ASSERT3U(BP_GET_NDVAS(bp), ==, 0); 1631e14bb325SJeff Bonwick ASSERT3U(zio->io_prop.zp_ndvas, >, 0); 1632e14bb325SJeff Bonwick ASSERT3U(zio->io_prop.zp_ndvas, <=, spa_max_replication(spa)); 1633fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 1634fa9e4066Sahrens 1635e14bb325SJeff Bonwick error = metaslab_alloc(spa, mc, zio->io_size, bp, 1636e14bb325SJeff Bonwick zio->io_prop.zp_ndvas, zio->io_txg, NULL, 0); 1637fa9e4066Sahrens 1638e14bb325SJeff Bonwick if (error) { 1639e14bb325SJeff Bonwick if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) 1640e14bb325SJeff Bonwick return (zio_write_gang_block(zio)); 1641fa9e4066Sahrens zio->io_error = error; 1642fa9e4066Sahrens } 1643e05725b1Sbonwick 1644e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1645fa9e4066Sahrens } 1646fa9e4066Sahrens 1647e05725b1Sbonwick static int 1648fa9e4066Sahrens zio_dva_free(zio_t *zio) 1649fa9e4066Sahrens { 1650e14bb325SJeff Bonwick metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); 1651fa9e4066Sahrens 1652e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1653fa9e4066Sahrens } 1654fa9e4066Sahrens 1655e05725b1Sbonwick static int 1656fa9e4066Sahrens zio_dva_claim(zio_t *zio) 1657fa9e4066Sahrens { 1658e14bb325SJeff Bonwick int error; 1659e14bb325SJeff Bonwick 1660e14bb325SJeff Bonwick error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); 1661e14bb325SJeff Bonwick if (error) 1662e14bb325SJeff Bonwick zio->io_error = error; 1663fa9e4066Sahrens 1664e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1665fa9e4066Sahrens } 1666fa9e4066Sahrens 1667e14bb325SJeff Bonwick /* 1668e14bb325SJeff Bonwick * Undo an allocation. This is used by zio_done() when an I/O fails 1669e14bb325SJeff Bonwick * and we want to give back the block we just allocated. 1670e14bb325SJeff Bonwick * This handles both normal blocks and gang blocks. 1671e14bb325SJeff Bonwick */ 1672e14bb325SJeff Bonwick static void 1673e14bb325SJeff Bonwick zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) 1674e14bb325SJeff Bonwick { 1675e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 1676e14bb325SJeff Bonwick boolean_t now = !(zio->io_flags & ZIO_FLAG_IO_REWRITE); 1677e14bb325SJeff Bonwick 1678e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 1679e14bb325SJeff Bonwick 1680e14bb325SJeff Bonwick if (zio->io_bp == bp && !now) { 1681e14bb325SJeff Bonwick /* 1682e14bb325SJeff Bonwick * This is a rewrite for sync-to-convergence. 1683e14bb325SJeff Bonwick * We can't do a metaslab_free(NOW) because bp wasn't allocated 1684e14bb325SJeff Bonwick * during this sync pass, which means that metaslab_sync() 1685e14bb325SJeff Bonwick * already committed the allocation. 1686e14bb325SJeff Bonwick */ 1687e14bb325SJeff Bonwick ASSERT(DVA_EQUAL(BP_IDENTITY(bp), 1688e14bb325SJeff Bonwick BP_IDENTITY(&zio->io_bp_orig))); 1689e14bb325SJeff Bonwick ASSERT(spa_sync_pass(spa) > 1); 1690e14bb325SJeff Bonwick 1691e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && gn == NULL) { 1692e14bb325SJeff Bonwick /* 1693e14bb325SJeff Bonwick * This is a gang leader whose gang header(s) we 1694e14bb325SJeff Bonwick * couldn't read now, so defer the free until later. 1695e14bb325SJeff Bonwick * The block should still be intact because without 1696e14bb325SJeff Bonwick * the headers, we'd never even start the rewrite. 1697e14bb325SJeff Bonwick */ 1698e14bb325SJeff Bonwick bplist_enqueue_deferred(&spa->spa_sync_bplist, bp); 1699e14bb325SJeff Bonwick return; 1700e14bb325SJeff Bonwick } 1701e14bb325SJeff Bonwick } 1702e14bb325SJeff Bonwick 1703e14bb325SJeff Bonwick if (!BP_IS_HOLE(bp)) 1704e14bb325SJeff Bonwick metaslab_free(spa, bp, bp->blk_birth, now); 1705e14bb325SJeff Bonwick 1706e14bb325SJeff Bonwick if (gn != NULL) { 1707e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1708e14bb325SJeff Bonwick zio_dva_unallocate(zio, gn->gn_child[g], 1709e14bb325SJeff Bonwick &gn->gn_gbh->zg_blkptr[g]); 1710e14bb325SJeff Bonwick } 1711e14bb325SJeff Bonwick } 1712e14bb325SJeff Bonwick } 1713e14bb325SJeff Bonwick 1714e14bb325SJeff Bonwick /* 1715e14bb325SJeff Bonwick * Try to allocate an intent log block. Return 0 on success, errno on failure. 1716e14bb325SJeff Bonwick */ 1717e14bb325SJeff Bonwick int 1718e14bb325SJeff Bonwick zio_alloc_blk(spa_t *spa, uint64_t size, blkptr_t *new_bp, blkptr_t *old_bp, 1719e14bb325SJeff Bonwick uint64_t txg) 1720e14bb325SJeff Bonwick { 1721e14bb325SJeff Bonwick int error; 1722e14bb325SJeff Bonwick 1723e14bb325SJeff Bonwick error = metaslab_alloc(spa, spa->spa_log_class, size, 1724e14bb325SJeff Bonwick new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); 1725e14bb325SJeff Bonwick 1726e14bb325SJeff Bonwick if (error) 1727e14bb325SJeff Bonwick error = metaslab_alloc(spa, spa->spa_normal_class, size, 1728e14bb325SJeff Bonwick new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); 1729e14bb325SJeff Bonwick 1730e14bb325SJeff Bonwick if (error == 0) { 1731e14bb325SJeff Bonwick BP_SET_LSIZE(new_bp, size); 1732e14bb325SJeff Bonwick BP_SET_PSIZE(new_bp, size); 1733e14bb325SJeff Bonwick BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); 1734e14bb325SJeff Bonwick BP_SET_CHECKSUM(new_bp, ZIO_CHECKSUM_ZILOG); 1735e14bb325SJeff Bonwick BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 1736e14bb325SJeff Bonwick BP_SET_LEVEL(new_bp, 0); 1737e14bb325SJeff Bonwick BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); 1738e14bb325SJeff Bonwick } 1739e14bb325SJeff Bonwick 1740e14bb325SJeff Bonwick return (error); 1741e14bb325SJeff Bonwick } 1742e14bb325SJeff Bonwick 1743e14bb325SJeff Bonwick /* 1744e14bb325SJeff Bonwick * Free an intent log block. We know it can't be a gang block, so there's 1745e14bb325SJeff Bonwick * nothing to do except metaslab_free() it. 1746e14bb325SJeff Bonwick */ 1747e14bb325SJeff Bonwick void 1748e14bb325SJeff Bonwick zio_free_blk(spa_t *spa, blkptr_t *bp, uint64_t txg) 1749e14bb325SJeff Bonwick { 1750e14bb325SJeff Bonwick ASSERT(!BP_IS_GANG(bp)); 1751e14bb325SJeff Bonwick 1752e14bb325SJeff Bonwick metaslab_free(spa, bp, txg, B_FALSE); 1753e14bb325SJeff Bonwick } 1754e14bb325SJeff Bonwick 1755fa9e4066Sahrens /* 1756fa9e4066Sahrens * ========================================================================== 1757fa9e4066Sahrens * Read and write to physical devices 1758fa9e4066Sahrens * ========================================================================== 1759fa9e4066Sahrens */ 1760e05725b1Sbonwick static int 176144cd46caSbillm zio_vdev_io_start(zio_t *zio) 1762fa9e4066Sahrens { 1763fa9e4066Sahrens vdev_t *vd = zio->io_vd; 176444cd46caSbillm uint64_t align; 17650a4e9518Sgw spa_t *spa = zio->io_spa; 17660a4e9518Sgw 1767e14bb325SJeff Bonwick ASSERT(zio->io_error == 0); 1768e14bb325SJeff Bonwick ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); 1769fa9e4066Sahrens 1770e14bb325SJeff Bonwick if (vd == NULL) { 1771e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 1772e14bb325SJeff Bonwick spa_config_enter(spa, SCL_ZIO, zio, RW_READER); 1773fa9e4066Sahrens 1774e14bb325SJeff Bonwick /* 1775e14bb325SJeff Bonwick * The mirror_ops handle multiple DVAs in a single BP. 1776e14bb325SJeff Bonwick */ 1777e14bb325SJeff Bonwick return (vdev_mirror_ops.vdev_op_io_start(zio)); 1778fa9e4066Sahrens } 1779fa9e4066Sahrens 1780e14bb325SJeff Bonwick align = 1ULL << vd->vdev_top->vdev_ashift; 1781e14bb325SJeff Bonwick 1782ecc2d604Sbonwick if (P2PHASE(zio->io_size, align) != 0) { 1783ecc2d604Sbonwick uint64_t asize = P2ROUNDUP(zio->io_size, align); 1784ecc2d604Sbonwick char *abuf = zio_buf_alloc(asize); 1785e14bb325SJeff Bonwick ASSERT(vd == vd->vdev_top); 1786ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_WRITE) { 1787ecc2d604Sbonwick bcopy(zio->io_data, abuf, zio->io_size); 1788ecc2d604Sbonwick bzero(abuf + zio->io_size, asize - zio->io_size); 1789ecc2d604Sbonwick } 1790e14bb325SJeff Bonwick zio_push_transform(zio, abuf, asize, asize, zio_subblock); 1791ecc2d604Sbonwick } 1792ecc2d604Sbonwick 1793ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_offset, align) == 0); 1794ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_size, align) == 0); 17958ad4d6ddSJeff Bonwick ASSERT(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); 17968ad4d6ddSJeff Bonwick 17978ad4d6ddSJeff Bonwick /* 17988ad4d6ddSJeff Bonwick * If this is a repair I/O, and there's no self-healing involved -- 17998ad4d6ddSJeff Bonwick * that is, we're just resilvering what we expect to resilver -- 18008ad4d6ddSJeff Bonwick * then don't do the I/O unless zio's txg is actually in vd's DTL. 18018ad4d6ddSJeff Bonwick * This prevents spurious resilvering with nested replication. 18028ad4d6ddSJeff Bonwick * For example, given a mirror of mirrors, (A+B)+(C+D), if only 18038ad4d6ddSJeff Bonwick * A is out of date, we'll read from C+D, then use the data to 18048ad4d6ddSJeff Bonwick * resilver A+B -- but we don't actually want to resilver B, just A. 18058ad4d6ddSJeff Bonwick * The top-level mirror has no way to know this, so instead we just 18068ad4d6ddSJeff Bonwick * discard unnecessary repairs as we work our way down the vdev tree. 18078ad4d6ddSJeff Bonwick * The same logic applies to any form of nested replication: 18088ad4d6ddSJeff Bonwick * ditto + mirror, RAID-Z + replacing, etc. This covers them all. 18098ad4d6ddSJeff Bonwick */ 18108ad4d6ddSJeff Bonwick if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && 18118ad4d6ddSJeff Bonwick !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && 18128ad4d6ddSJeff Bonwick zio->io_txg != 0 && /* not a delegated i/o */ 18138ad4d6ddSJeff Bonwick !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { 18148ad4d6ddSJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 18158ad4d6ddSJeff Bonwick zio_vdev_io_bypass(zio); 18168ad4d6ddSJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 18178ad4d6ddSJeff Bonwick } 1818fa9e4066Sahrens 1819e14bb325SJeff Bonwick if (vd->vdev_ops->vdev_op_leaf && 1820e14bb325SJeff Bonwick (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { 1821e14bb325SJeff Bonwick 1822e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) 1823a3f829aeSBill Moore return (ZIO_PIPELINE_CONTINUE); 1824e14bb325SJeff Bonwick 1825e14bb325SJeff Bonwick if ((zio = vdev_queue_io(zio)) == NULL) 1826e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1827e14bb325SJeff Bonwick 1828e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 1829e14bb325SJeff Bonwick zio->io_error = ENXIO; 1830e14bb325SJeff Bonwick zio_interrupt(zio); 1831e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1832e14bb325SJeff Bonwick } 1833e14bb325SJeff Bonwick } 1834e14bb325SJeff Bonwick 1835e05725b1Sbonwick return (vd->vdev_ops->vdev_op_io_start(zio)); 1836fa9e4066Sahrens } 1837fa9e4066Sahrens 1838e05725b1Sbonwick static int 1839fa9e4066Sahrens zio_vdev_io_done(zio_t *zio) 1840fa9e4066Sahrens { 1841e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 1842e14bb325SJeff Bonwick vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; 1843e14bb325SJeff Bonwick boolean_t unexpected_error = B_FALSE; 1844e05725b1Sbonwick 1845e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 1846e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1847fa9e4066Sahrens 1848e14bb325SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); 1849e14bb325SJeff Bonwick 1850e14bb325SJeff Bonwick if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { 1851e14bb325SJeff Bonwick 1852e14bb325SJeff Bonwick vdev_queue_io_done(zio); 1853fa9e4066Sahrens 1854e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE) 1855e14bb325SJeff Bonwick vdev_cache_write(zio); 1856e14bb325SJeff Bonwick 1857e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 1858e14bb325SJeff Bonwick zio->io_error = zio_handle_device_injection(vd, EIO); 1859e14bb325SJeff Bonwick 1860e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 1861e14bb325SJeff Bonwick zio->io_error = zio_handle_label_injection(zio, EIO); 1862e14bb325SJeff Bonwick 1863e14bb325SJeff Bonwick if (zio->io_error) { 1864e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 1865e14bb325SJeff Bonwick zio->io_error = ENXIO; 1866e14bb325SJeff Bonwick } else { 1867e14bb325SJeff Bonwick unexpected_error = B_TRUE; 1868e14bb325SJeff Bonwick } 1869e14bb325SJeff Bonwick } 187051ece835Seschrock } 1871fa9e4066Sahrens 1872e14bb325SJeff Bonwick ops->vdev_op_io_done(zio); 1873e14bb325SJeff Bonwick 1874e14bb325SJeff Bonwick if (unexpected_error) 1875a3f829aeSBill Moore VERIFY(vdev_probe(vd, zio) == NULL); 1876e14bb325SJeff Bonwick 1877e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1878fa9e4066Sahrens } 1879fa9e4066Sahrens 1880e05725b1Sbonwick static int 1881fa9e4066Sahrens zio_vdev_io_assess(zio_t *zio) 1882fa9e4066Sahrens { 1883fa9e4066Sahrens vdev_t *vd = zio->io_vd; 1884e14bb325SJeff Bonwick 1885e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 1886e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1887e14bb325SJeff Bonwick 1888e14bb325SJeff Bonwick if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 1889e14bb325SJeff Bonwick spa_config_exit(zio->io_spa, SCL_ZIO, zio); 1890e14bb325SJeff Bonwick 1891e14bb325SJeff Bonwick if (zio->io_vsd != NULL) { 1892e14bb325SJeff Bonwick zio->io_vsd_free(zio); 1893e14bb325SJeff Bonwick zio->io_vsd = NULL; 1894ecc2d604Sbonwick } 1895ecc2d604Sbonwick 1896e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 1897ea8dc4b6Seschrock zio->io_error = zio_handle_fault_injection(zio, EIO); 1898ea8dc4b6Seschrock 1899fa9e4066Sahrens /* 1900fa9e4066Sahrens * If the I/O failed, determine whether we should attempt to retry it. 1901fa9e4066Sahrens */ 1902e14bb325SJeff Bonwick if (zio->io_error && vd == NULL && 1903e14bb325SJeff Bonwick !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { 1904e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ 1905e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ 1906fa9e4066Sahrens zio->io_error = 0; 1907e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_RETRY | 1908e14bb325SJeff Bonwick ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; 190944cd46caSbillm zio->io_stage = ZIO_STAGE_VDEV_IO_START - 1; 1910e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 1911e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1912ea8dc4b6Seschrock } 1913fa9e4066Sahrens 1914e14bb325SJeff Bonwick /* 1915e14bb325SJeff Bonwick * If we got an error on a leaf device, convert it to ENXIO 1916e14bb325SJeff Bonwick * if the device is not accessible at all. 1917e14bb325SJeff Bonwick */ 1918e14bb325SJeff Bonwick if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && 1919e14bb325SJeff Bonwick !vdev_accessible(vd, zio)) 1920e14bb325SJeff Bonwick zio->io_error = ENXIO; 1921e14bb325SJeff Bonwick 1922e14bb325SJeff Bonwick /* 1923e14bb325SJeff Bonwick * If we can't write to an interior vdev (mirror or RAID-Z), 1924e14bb325SJeff Bonwick * set vdev_cant_write so that we stop trying to allocate from it. 1925e14bb325SJeff Bonwick */ 1926e14bb325SJeff Bonwick if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && 1927e14bb325SJeff Bonwick vd != NULL && !vd->vdev_ops->vdev_op_leaf) 1928e14bb325SJeff Bonwick vd->vdev_cant_write = B_TRUE; 1929e14bb325SJeff Bonwick 1930e14bb325SJeff Bonwick if (zio->io_error) 1931e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1932e14bb325SJeff Bonwick 1933e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1934fa9e4066Sahrens } 1935fa9e4066Sahrens 1936fa9e4066Sahrens void 1937fa9e4066Sahrens zio_vdev_io_reissue(zio_t *zio) 1938fa9e4066Sahrens { 1939fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 1940fa9e4066Sahrens ASSERT(zio->io_error == 0); 1941fa9e4066Sahrens 1942fa9e4066Sahrens zio->io_stage--; 1943fa9e4066Sahrens } 1944fa9e4066Sahrens 1945fa9e4066Sahrens void 1946fa9e4066Sahrens zio_vdev_io_redone(zio_t *zio) 1947fa9e4066Sahrens { 1948fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); 1949fa9e4066Sahrens 1950fa9e4066Sahrens zio->io_stage--; 1951fa9e4066Sahrens } 1952fa9e4066Sahrens 1953fa9e4066Sahrens void 1954fa9e4066Sahrens zio_vdev_io_bypass(zio_t *zio) 1955fa9e4066Sahrens { 1956fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 1957fa9e4066Sahrens ASSERT(zio->io_error == 0); 1958fa9e4066Sahrens 1959fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_IO_BYPASS; 1960fa9e4066Sahrens zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS - 1; 1961fa9e4066Sahrens } 1962fa9e4066Sahrens 1963fa9e4066Sahrens /* 1964fa9e4066Sahrens * ========================================================================== 1965fa9e4066Sahrens * Generate and verify checksums 1966fa9e4066Sahrens * ========================================================================== 1967fa9e4066Sahrens */ 1968e05725b1Sbonwick static int 1969fa9e4066Sahrens zio_checksum_generate(zio_t *zio) 1970fa9e4066Sahrens { 1971fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 1972e14bb325SJeff Bonwick enum zio_checksum checksum; 1973fa9e4066Sahrens 1974e14bb325SJeff Bonwick if (bp == NULL) { 1975e14bb325SJeff Bonwick /* 1976e14bb325SJeff Bonwick * This is zio_write_phys(). 1977e14bb325SJeff Bonwick * We're either generating a label checksum, or none at all. 1978e14bb325SJeff Bonwick */ 1979e14bb325SJeff Bonwick checksum = zio->io_prop.zp_checksum; 1980e14bb325SJeff Bonwick 1981e14bb325SJeff Bonwick if (checksum == ZIO_CHECKSUM_OFF) 1982e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1983fa9e4066Sahrens 1984e14bb325SJeff Bonwick ASSERT(checksum == ZIO_CHECKSUM_LABEL); 1985e14bb325SJeff Bonwick } else { 1986e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { 1987e14bb325SJeff Bonwick ASSERT(!IO_IS_ALLOCATING(zio)); 1988e14bb325SJeff Bonwick checksum = ZIO_CHECKSUM_GANG_HEADER; 1989e14bb325SJeff Bonwick } else { 1990e14bb325SJeff Bonwick checksum = BP_GET_CHECKSUM(bp); 1991e14bb325SJeff Bonwick } 1992e14bb325SJeff Bonwick } 1993fa9e4066Sahrens 1994e14bb325SJeff Bonwick zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); 1995fa9e4066Sahrens 1996e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1997fa9e4066Sahrens } 1998fa9e4066Sahrens 1999e05725b1Sbonwick static int 2000e14bb325SJeff Bonwick zio_checksum_verify(zio_t *zio) 2001fa9e4066Sahrens { 2002e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2003e14bb325SJeff Bonwick int error; 2004fa9e4066Sahrens 2005e14bb325SJeff Bonwick if (bp == NULL) { 2006e14bb325SJeff Bonwick /* 2007e14bb325SJeff Bonwick * This is zio_read_phys(). 2008e14bb325SJeff Bonwick * We're either verifying a label checksum, or nothing at all. 2009e14bb325SJeff Bonwick */ 2010e14bb325SJeff Bonwick if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) 2011e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2012fa9e4066Sahrens 2013e14bb325SJeff Bonwick ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); 2014e14bb325SJeff Bonwick } 2015fa9e4066Sahrens 2016e14bb325SJeff Bonwick if ((error = zio_checksum_error(zio)) != 0) { 2017e14bb325SJeff Bonwick zio->io_error = error; 2018e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { 2019ea8dc4b6Seschrock zfs_ereport_post(FM_EREPORT_ZFS_CHECKSUM, 2020ea8dc4b6Seschrock zio->io_spa, zio->io_vd, zio, 0, 0); 2021e14bb325SJeff Bonwick } 2022fa9e4066Sahrens } 2023fa9e4066Sahrens 2024e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2025fa9e4066Sahrens } 2026fa9e4066Sahrens 2027fa9e4066Sahrens /* 2028fa9e4066Sahrens * Called by RAID-Z to ensure we don't compute the checksum twice. 2029fa9e4066Sahrens */ 2030fa9e4066Sahrens void 2031fa9e4066Sahrens zio_checksum_verified(zio_t *zio) 2032fa9e4066Sahrens { 2033fa9e4066Sahrens zio->io_pipeline &= ~(1U << ZIO_STAGE_CHECKSUM_VERIFY); 2034fa9e4066Sahrens } 2035fa9e4066Sahrens 2036fa9e4066Sahrens /* 2037e14bb325SJeff Bonwick * ========================================================================== 2038e14bb325SJeff Bonwick * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. 2039e14bb325SJeff Bonwick * An error of 0 indictes success. ENXIO indicates whole-device failure, 2040e14bb325SJeff Bonwick * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO 2041e14bb325SJeff Bonwick * indicate errors that are specific to one I/O, and most likely permanent. 2042e14bb325SJeff Bonwick * Any other error is presumed to be worse because we weren't expecting it. 2043e14bb325SJeff Bonwick * ========================================================================== 2044fa9e4066Sahrens */ 2045e14bb325SJeff Bonwick int 2046e14bb325SJeff Bonwick zio_worst_error(int e1, int e2) 2047fa9e4066Sahrens { 2048e14bb325SJeff Bonwick static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; 2049e14bb325SJeff Bonwick int r1, r2; 2050e14bb325SJeff Bonwick 2051e14bb325SJeff Bonwick for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) 2052e14bb325SJeff Bonwick if (e1 == zio_error_rank[r1]) 2053e14bb325SJeff Bonwick break; 2054e14bb325SJeff Bonwick 2055e14bb325SJeff Bonwick for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) 2056e14bb325SJeff Bonwick if (e2 == zio_error_rank[r2]) 2057e14bb325SJeff Bonwick break; 205844cd46caSbillm 2059e14bb325SJeff Bonwick return (r1 > r2 ? e1 : e2); 2060fa9e4066Sahrens } 2061fa9e4066Sahrens 2062fa9e4066Sahrens /* 2063fa9e4066Sahrens * ========================================================================== 2064e14bb325SJeff Bonwick * I/O completion 2065fa9e4066Sahrens * ========================================================================== 2066fa9e4066Sahrens */ 2067e14bb325SJeff Bonwick static int 2068e14bb325SJeff Bonwick zio_ready(zio_t *zio) 2069fa9e4066Sahrens { 2070e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2071a3f829aeSBill Moore zio_t *pio, *pio_next; 2072fa9e4066Sahrens 2073f5383399SBill Moore if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY)) 2074f5383399SBill Moore return (ZIO_PIPELINE_STOP); 2075fa9e4066Sahrens 2076f5383399SBill Moore if (zio->io_ready) { 2077e14bb325SJeff Bonwick ASSERT(IO_IS_ALLOCATING(zio)); 2078e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2079e14bb325SJeff Bonwick ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); 2080fa9e4066Sahrens 2081e14bb325SJeff Bonwick zio->io_ready(zio); 2082e14bb325SJeff Bonwick } 2083fa9e4066Sahrens 2084e14bb325SJeff Bonwick if (bp != NULL && bp != &zio->io_bp_copy) 2085e14bb325SJeff Bonwick zio->io_bp_copy = *bp; 2086fa9e4066Sahrens 2087e14bb325SJeff Bonwick if (zio->io_error) 2088e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2089fa9e4066Sahrens 2090a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2091a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = 1; 2092a3f829aeSBill Moore pio = zio_walk_parents(zio); 2093a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2094a3f829aeSBill Moore 2095a3f829aeSBill Moore /* 2096a3f829aeSBill Moore * As we notify zio's parents, new parents could be added. 2097a3f829aeSBill Moore * New parents go to the head of zio's io_parent_list, however, 2098a3f829aeSBill Moore * so we will (correctly) not notify them. The remainder of zio's 2099a3f829aeSBill Moore * io_parent_list, from 'pio_next' onward, cannot change because 2100a3f829aeSBill Moore * all parents must wait for us to be done before they can be done. 2101a3f829aeSBill Moore */ 2102a3f829aeSBill Moore for (; pio != NULL; pio = pio_next) { 2103a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2104e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_READY); 2105a3f829aeSBill Moore } 2106fa9e4066Sahrens 2107e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2108fa9e4066Sahrens } 2109fa9e4066Sahrens 2110e14bb325SJeff Bonwick static int 2111e14bb325SJeff Bonwick zio_done(zio_t *zio) 2112d63d470bSgw { 2113e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 2114e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 2115e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2116e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2117e14bb325SJeff Bonwick uint64_t psize = zio->io_size; 2118a3f829aeSBill Moore zio_t *pio, *pio_next; 2119d63d470bSgw 2120e14bb325SJeff Bonwick /* 2121f5383399SBill Moore * If our children haven't all completed, 2122e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 2123e14bb325SJeff Bonwick */ 2124e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || 2125e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || 2126e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) 2127e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2128d63d470bSgw 2129e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 2130e14bb325SJeff Bonwick for (int w = 0; w < ZIO_WAIT_TYPES; w++) 2131e14bb325SJeff Bonwick ASSERT(zio->io_children[c][w] == 0); 2132e14bb325SJeff Bonwick 2133e14bb325SJeff Bonwick if (bp != NULL) { 2134e14bb325SJeff Bonwick ASSERT(bp->blk_pad[0] == 0); 2135e14bb325SJeff Bonwick ASSERT(bp->blk_pad[1] == 0); 2136e14bb325SJeff Bonwick ASSERT(bp->blk_pad[2] == 0); 2137e14bb325SJeff Bonwick ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || 2138a3f829aeSBill Moore (bp == zio_unique_parent(zio)->io_bp)); 2139e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && 2140e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { 2141e14bb325SJeff Bonwick ASSERT(!BP_SHOULD_BYTESWAP(bp)); 2142e14bb325SJeff Bonwick ASSERT3U(zio->io_prop.zp_ndvas, <=, BP_GET_NDVAS(bp)); 2143e14bb325SJeff Bonwick ASSERT(BP_COUNT_GANG(bp) == 0 || 2144e14bb325SJeff Bonwick (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); 2145e14bb325SJeff Bonwick } 2146e14bb325SJeff Bonwick } 2147fa9e4066Sahrens 2148e14bb325SJeff Bonwick /* 2149e14bb325SJeff Bonwick * If there were child vdev or gang errors, they apply to us now. 2150e14bb325SJeff Bonwick */ 2151e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); 2152e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_GANG); 2153e14bb325SJeff Bonwick 2154e14bb325SJeff Bonwick zio_pop_transforms(zio); /* note: may set zio->io_error */ 2155e14bb325SJeff Bonwick 2156e14bb325SJeff Bonwick vdev_stat_update(zio, psize); 2157e14bb325SJeff Bonwick 2158e14bb325SJeff Bonwick if (zio->io_error) { 2159e14bb325SJeff Bonwick /* 2160e14bb325SJeff Bonwick * If this I/O is attached to a particular vdev, 2161e14bb325SJeff Bonwick * generate an error message describing the I/O failure 2162e14bb325SJeff Bonwick * at the block level. We ignore these errors if the 2163e14bb325SJeff Bonwick * device is currently unavailable. 2164e14bb325SJeff Bonwick */ 2165e14bb325SJeff Bonwick if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) 2166e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, zio, 0, 0); 2167e14bb325SJeff Bonwick 2168e14bb325SJeff Bonwick if ((zio->io_error == EIO || 2169e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) && zio == lio) { 2170e14bb325SJeff Bonwick /* 2171e14bb325SJeff Bonwick * For logical I/O requests, tell the SPA to log the 2172e14bb325SJeff Bonwick * error and generate a logical data ereport. 2173e14bb325SJeff Bonwick */ 2174e14bb325SJeff Bonwick spa_log_error(spa, zio); 2175e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, zio, 2176e14bb325SJeff Bonwick 0, 0); 2177e14bb325SJeff Bonwick } 2178e14bb325SJeff Bonwick } 2179fa9e4066Sahrens 2180e14bb325SJeff Bonwick if (zio->io_error && zio == lio) { 2181e14bb325SJeff Bonwick /* 2182e14bb325SJeff Bonwick * Determine whether zio should be reexecuted. This will 2183e14bb325SJeff Bonwick * propagate all the way to the root via zio_notify_parent(). 2184e14bb325SJeff Bonwick */ 2185e14bb325SJeff Bonwick ASSERT(vd == NULL && bp != NULL); 2186e14bb325SJeff Bonwick 2187e14bb325SJeff Bonwick if (IO_IS_ALLOCATING(zio)) 2188e14bb325SJeff Bonwick if (zio->io_error != ENOSPC) 2189e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_NOW; 2190e14bb325SJeff Bonwick else 2191e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2192e14bb325SJeff Bonwick 2193e14bb325SJeff Bonwick if ((zio->io_type == ZIO_TYPE_READ || 2194e14bb325SJeff Bonwick zio->io_type == ZIO_TYPE_FREE) && 2195e14bb325SJeff Bonwick zio->io_error == ENXIO && 21968ad4d6ddSJeff Bonwick spa->spa_load_state == SPA_LOAD_NONE && 2197e14bb325SJeff Bonwick spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) 2198e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2199e14bb325SJeff Bonwick 2200e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) 2201e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2202d63d470bSgw } 2203d63d470bSgw 220467bd71c6Sperrin /* 2205e14bb325SJeff Bonwick * If there were logical child errors, they apply to us now. 2206e14bb325SJeff Bonwick * We defer this until now to avoid conflating logical child 2207e14bb325SJeff Bonwick * errors with errors that happened to the zio itself when 2208e14bb325SJeff Bonwick * updating vdev stats and reporting FMA events above. 220967bd71c6Sperrin */ 2210e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); 22118654d025Sperrin 2212f5383399SBill Moore if ((zio->io_error || zio->io_reexecute) && IO_IS_ALLOCATING(zio) && 2213f5383399SBill Moore zio->io_child_type == ZIO_CHILD_LOGICAL) { 2214f5383399SBill Moore ASSERT(zio->io_child_type != ZIO_CHILD_GANG); 2215f5383399SBill Moore zio_dva_unallocate(zio, zio->io_gang_tree, bp); 2216f5383399SBill Moore } 2217f5383399SBill Moore 2218f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 2219f5383399SBill Moore 2220*33a372edSGeorge Wilson /* 2221*33a372edSGeorge Wilson * Godfather I/Os should never suspend. 2222*33a372edSGeorge Wilson */ 2223*33a372edSGeorge Wilson if ((zio->io_flags & ZIO_FLAG_GODFATHER) && 2224*33a372edSGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) 2225*33a372edSGeorge Wilson zio->io_reexecute = 0; 2226*33a372edSGeorge Wilson 2227*33a372edSGeorge Wilson if (zio->io_reexecute) { 2228e14bb325SJeff Bonwick /* 2229e14bb325SJeff Bonwick * This is a logical I/O that wants to reexecute. 2230e14bb325SJeff Bonwick * 2231e14bb325SJeff Bonwick * Reexecute is top-down. When an i/o fails, if it's not 2232e14bb325SJeff Bonwick * the root, it simply notifies its parent and sticks around. 2233e14bb325SJeff Bonwick * The parent, seeing that it still has children in zio_done(), 2234e14bb325SJeff Bonwick * does the same. This percolates all the way up to the root. 2235e14bb325SJeff Bonwick * The root i/o will reexecute or suspend the entire tree. 2236e14bb325SJeff Bonwick * 2237e14bb325SJeff Bonwick * This approach ensures that zio_reexecute() honors 2238e14bb325SJeff Bonwick * all the original i/o dependency relationships, e.g. 2239e14bb325SJeff Bonwick * parents not executing until children are ready. 2240e14bb325SJeff Bonwick */ 2241e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2242fa9e4066Sahrens 2243f5383399SBill Moore zio->io_gang_leader = NULL; 2244e14bb325SJeff Bonwick 2245a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2246a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 2247a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2248a3f829aeSBill Moore 224954d692b7SGeorge Wilson /* 225054d692b7SGeorge Wilson * "The Godfather" I/O monitors its children but is 225154d692b7SGeorge Wilson * not a true parent to them. It will track them through 225254d692b7SGeorge Wilson * the pipeline but severs its ties whenever they get into 225354d692b7SGeorge Wilson * trouble (e.g. suspended). This allows "The Godfather" 225454d692b7SGeorge Wilson * I/O to return status without blocking. 225554d692b7SGeorge Wilson */ 225654d692b7SGeorge Wilson for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 225754d692b7SGeorge Wilson zio_link_t *zl = zio->io_walk_link; 225854d692b7SGeorge Wilson pio_next = zio_walk_parents(zio); 225954d692b7SGeorge Wilson 226054d692b7SGeorge Wilson if ((pio->io_flags & ZIO_FLAG_GODFATHER) && 226154d692b7SGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { 226254d692b7SGeorge Wilson zio_remove_child(pio, zio, zl); 226354d692b7SGeorge Wilson zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 226454d692b7SGeorge Wilson } 226554d692b7SGeorge Wilson } 226654d692b7SGeorge Wilson 2267a3f829aeSBill Moore if ((pio = zio_unique_parent(zio)) != NULL) { 2268e14bb325SJeff Bonwick /* 2269e14bb325SJeff Bonwick * We're not a root i/o, so there's nothing to do 2270e14bb325SJeff Bonwick * but notify our parent. Don't propagate errors 2271e14bb325SJeff Bonwick * upward since we haven't permanently failed yet. 2272e14bb325SJeff Bonwick */ 2273*33a372edSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 2274e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; 2275e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2276e14bb325SJeff Bonwick } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { 2277e14bb325SJeff Bonwick /* 2278e14bb325SJeff Bonwick * We'd fail again if we reexecuted now, so suspend 2279e14bb325SJeff Bonwick * until conditions improve (e.g. device comes online). 2280e14bb325SJeff Bonwick */ 2281e14bb325SJeff Bonwick zio_suspend(spa, zio); 2282e14bb325SJeff Bonwick } else { 2283e14bb325SJeff Bonwick /* 2284e14bb325SJeff Bonwick * Reexecution is potentially a huge amount of work. 2285e14bb325SJeff Bonwick * Hand it off to the otherwise-unused claim taskq. 2286e14bb325SJeff Bonwick */ 2287e14bb325SJeff Bonwick (void) taskq_dispatch( 2288e14bb325SJeff Bonwick spa->spa_zio_taskq[ZIO_TYPE_CLAIM][ZIO_TASKQ_ISSUE], 2289e14bb325SJeff Bonwick (task_func_t *)zio_reexecute, zio, TQ_SLEEP); 2290e14bb325SJeff Bonwick } 2291e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2292fa9e4066Sahrens } 2293fa9e4066Sahrens 2294a3f829aeSBill Moore ASSERT(zio_walk_children(zio) == NULL); 2295*33a372edSGeorge Wilson ASSERT(zio->io_reexecute == 0); 2296e14bb325SJeff Bonwick ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); 2297fa9e4066Sahrens 2298a3f829aeSBill Moore /* 2299a3f829aeSBill Moore * It is the responsibility of the done callback to ensure that this 2300a3f829aeSBill Moore * particular zio is no longer discoverable for adoption, and as 2301a3f829aeSBill Moore * such, cannot acquire any new parents. 2302a3f829aeSBill Moore */ 2303e14bb325SJeff Bonwick if (zio->io_done) 2304e14bb325SJeff Bonwick zio->io_done(zio); 2305fa9e4066Sahrens 2306a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2307a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 2308a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2309fa9e4066Sahrens 2310a3f829aeSBill Moore for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 2311a3f829aeSBill Moore zio_link_t *zl = zio->io_walk_link; 2312a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2313a3f829aeSBill Moore zio_remove_child(pio, zio, zl); 2314e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2315e14bb325SJeff Bonwick } 2316fa9e4066Sahrens 2317e14bb325SJeff Bonwick if (zio->io_waiter != NULL) { 2318e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 2319e14bb325SJeff Bonwick zio->io_executor = NULL; 2320e14bb325SJeff Bonwick cv_broadcast(&zio->io_cv); 2321e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 2322e14bb325SJeff Bonwick } else { 2323e14bb325SJeff Bonwick zio_destroy(zio); 2324e14bb325SJeff Bonwick } 2325fa9e4066Sahrens 2326e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2327fa9e4066Sahrens } 232846341222Sperrin 232946341222Sperrin /* 2330e14bb325SJeff Bonwick * ========================================================================== 2331e14bb325SJeff Bonwick * I/O pipeline definition 2332e14bb325SJeff Bonwick * ========================================================================== 233346341222Sperrin */ 2334e14bb325SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[ZIO_STAGES] = { 2335e14bb325SJeff Bonwick NULL, 2336e14bb325SJeff Bonwick zio_issue_async, 2337e14bb325SJeff Bonwick zio_read_bp_init, 2338e14bb325SJeff Bonwick zio_write_bp_init, 2339e14bb325SJeff Bonwick zio_checksum_generate, 2340e14bb325SJeff Bonwick zio_gang_assemble, 2341e14bb325SJeff Bonwick zio_gang_issue, 2342e14bb325SJeff Bonwick zio_dva_allocate, 2343e14bb325SJeff Bonwick zio_dva_free, 2344e14bb325SJeff Bonwick zio_dva_claim, 2345e14bb325SJeff Bonwick zio_ready, 2346e14bb325SJeff Bonwick zio_vdev_io_start, 2347e14bb325SJeff Bonwick zio_vdev_io_done, 2348e14bb325SJeff Bonwick zio_vdev_io_assess, 2349e14bb325SJeff Bonwick zio_checksum_verify, 2350e14bb325SJeff Bonwick zio_done 2351e14bb325SJeff Bonwick }; 2352