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> 35*b24ab676SJeff Bonwick #include <sys/dmu_objset.h> 36*b24ab676SJeff Bonwick #include <sys/arc.h> 37*b24ab676SJeff Bonwick #include <sys/ddt.h> 38fa9e4066Sahrens 39fa9e4066Sahrens /* 40fa9e4066Sahrens * ========================================================================== 41fa9e4066Sahrens * I/O priority table 42fa9e4066Sahrens * ========================================================================== 43fa9e4066Sahrens */ 44fa9e4066Sahrens uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE] = { 45fa9e4066Sahrens 0, /* ZIO_PRIORITY_NOW */ 46fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_READ */ 47fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_WRITE */ 48fa9e4066Sahrens 6, /* ZIO_PRIORITY_ASYNC_READ */ 49fa9e4066Sahrens 4, /* ZIO_PRIORITY_ASYNC_WRITE */ 50fa9e4066Sahrens 4, /* ZIO_PRIORITY_FREE */ 51fa9e4066Sahrens 0, /* ZIO_PRIORITY_CACHE_FILL */ 52fa9e4066Sahrens 0, /* ZIO_PRIORITY_LOG_WRITE */ 53fa9e4066Sahrens 10, /* ZIO_PRIORITY_RESILVER */ 54fa9e4066Sahrens 20, /* ZIO_PRIORITY_SCRUB */ 55fa9e4066Sahrens }; 56fa9e4066Sahrens 57fa9e4066Sahrens /* 58fa9e4066Sahrens * ========================================================================== 59fa9e4066Sahrens * I/O type descriptions 60fa9e4066Sahrens * ========================================================================== 61fa9e4066Sahrens */ 62fa9e4066Sahrens char *zio_type_name[ZIO_TYPES] = { 63fa9e4066Sahrens "null", "read", "write", "free", "claim", "ioctl" }; 64fa9e4066Sahrens 65fa9e4066Sahrens /* 66fa9e4066Sahrens * ========================================================================== 67fa9e4066Sahrens * I/O kmem caches 68fa9e4066Sahrens * ========================================================================== 69fa9e4066Sahrens */ 70ccae0b50Seschrock kmem_cache_t *zio_cache; 71a3f829aeSBill Moore kmem_cache_t *zio_link_cache; 72fa9e4066Sahrens kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 73ad23a2dbSjohansen kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 74ad23a2dbSjohansen 75ad23a2dbSjohansen #ifdef _KERNEL 76ad23a2dbSjohansen extern vmem_t *zio_alloc_arena; 77ad23a2dbSjohansen #endif 78fa9e4066Sahrens 790a4e9518Sgw /* 80e14bb325SJeff Bonwick * An allocating zio is one that either currently has the DVA allocate 81e14bb325SJeff Bonwick * stage set or will have it later in its lifetime. 820a4e9518Sgw */ 83*b24ab676SJeff Bonwick #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) 84*b24ab676SJeff Bonwick 85*b24ab676SJeff Bonwick #ifdef ZFS_DEBUG 86*b24ab676SJeff Bonwick int zio_buf_debug_limit = 16384; 87*b24ab676SJeff Bonwick #else 88*b24ab676SJeff Bonwick int zio_buf_debug_limit = 0; 89*b24ab676SJeff Bonwick #endif 900a4e9518Sgw 91fa9e4066Sahrens void 92fa9e4066Sahrens zio_init(void) 93fa9e4066Sahrens { 94fa9e4066Sahrens size_t c; 95ad23a2dbSjohansen vmem_t *data_alloc_arena = NULL; 96ad23a2dbSjohansen 97ad23a2dbSjohansen #ifdef _KERNEL 98ad23a2dbSjohansen data_alloc_arena = zio_alloc_arena; 99ad23a2dbSjohansen #endif 100a3f829aeSBill Moore zio_cache = kmem_cache_create("zio_cache", 101a3f829aeSBill Moore sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 102a3f829aeSBill Moore zio_link_cache = kmem_cache_create("zio_link_cache", 103a3f829aeSBill Moore sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 104ccae0b50Seschrock 105fa9e4066Sahrens /* 106fa9e4066Sahrens * For small buffers, we want a cache for each multiple of 107fa9e4066Sahrens * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache 108fa9e4066Sahrens * for each quarter-power of 2. For large buffers, we want 109fa9e4066Sahrens * a cache for each multiple of PAGESIZE. 110fa9e4066Sahrens */ 111fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 112fa9e4066Sahrens size_t size = (c + 1) << SPA_MINBLOCKSHIFT; 113fa9e4066Sahrens size_t p2 = size; 114fa9e4066Sahrens size_t align = 0; 115fa9e4066Sahrens 116fa9e4066Sahrens while (p2 & (p2 - 1)) 117fa9e4066Sahrens p2 &= p2 - 1; 118fa9e4066Sahrens 119fa9e4066Sahrens if (size <= 4 * SPA_MINBLOCKSIZE) { 120fa9e4066Sahrens align = SPA_MINBLOCKSIZE; 121fa9e4066Sahrens } else if (P2PHASE(size, PAGESIZE) == 0) { 122fa9e4066Sahrens align = PAGESIZE; 123fa9e4066Sahrens } else if (P2PHASE(size, p2 >> 2) == 0) { 124fa9e4066Sahrens align = p2 >> 2; 125fa9e4066Sahrens } 126fa9e4066Sahrens 127fa9e4066Sahrens if (align != 0) { 128ad23a2dbSjohansen char name[36]; 1295ad82045Snd (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); 130fa9e4066Sahrens zio_buf_cache[c] = kmem_cache_create(name, size, 131*b24ab676SJeff Bonwick align, NULL, NULL, NULL, NULL, NULL, 132*b24ab676SJeff Bonwick size > zio_buf_debug_limit ? KMC_NODEBUG : 0); 133ad23a2dbSjohansen 134ad23a2dbSjohansen (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); 135ad23a2dbSjohansen zio_data_buf_cache[c] = kmem_cache_create(name, size, 136ad23a2dbSjohansen align, NULL, NULL, NULL, NULL, data_alloc_arena, 137*b24ab676SJeff Bonwick size > zio_buf_debug_limit ? KMC_NODEBUG : 0); 138fa9e4066Sahrens } 139fa9e4066Sahrens } 140fa9e4066Sahrens 141fa9e4066Sahrens while (--c != 0) { 142fa9e4066Sahrens ASSERT(zio_buf_cache[c] != NULL); 143fa9e4066Sahrens if (zio_buf_cache[c - 1] == NULL) 144fa9e4066Sahrens zio_buf_cache[c - 1] = zio_buf_cache[c]; 145ad23a2dbSjohansen 146ad23a2dbSjohansen ASSERT(zio_data_buf_cache[c] != NULL); 147ad23a2dbSjohansen if (zio_data_buf_cache[c - 1] == NULL) 148ad23a2dbSjohansen zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; 149fa9e4066Sahrens } 150ea8dc4b6Seschrock 151ea8dc4b6Seschrock zio_inject_init(); 152fa9e4066Sahrens } 153fa9e4066Sahrens 154fa9e4066Sahrens void 155fa9e4066Sahrens zio_fini(void) 156fa9e4066Sahrens { 157fa9e4066Sahrens size_t c; 158fa9e4066Sahrens kmem_cache_t *last_cache = NULL; 159ad23a2dbSjohansen kmem_cache_t *last_data_cache = NULL; 160fa9e4066Sahrens 161fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 162fa9e4066Sahrens if (zio_buf_cache[c] != last_cache) { 163fa9e4066Sahrens last_cache = zio_buf_cache[c]; 164fa9e4066Sahrens kmem_cache_destroy(zio_buf_cache[c]); 165fa9e4066Sahrens } 166fa9e4066Sahrens zio_buf_cache[c] = NULL; 167ad23a2dbSjohansen 168ad23a2dbSjohansen if (zio_data_buf_cache[c] != last_data_cache) { 169ad23a2dbSjohansen last_data_cache = zio_data_buf_cache[c]; 170ad23a2dbSjohansen kmem_cache_destroy(zio_data_buf_cache[c]); 171ad23a2dbSjohansen } 172ad23a2dbSjohansen zio_data_buf_cache[c] = NULL; 173fa9e4066Sahrens } 174ea8dc4b6Seschrock 175a3f829aeSBill Moore kmem_cache_destroy(zio_link_cache); 176ccae0b50Seschrock kmem_cache_destroy(zio_cache); 177ccae0b50Seschrock 178ea8dc4b6Seschrock zio_inject_fini(); 179fa9e4066Sahrens } 180fa9e4066Sahrens 181fa9e4066Sahrens /* 182fa9e4066Sahrens * ========================================================================== 183fa9e4066Sahrens * Allocate and free I/O buffers 184fa9e4066Sahrens * ========================================================================== 185fa9e4066Sahrens */ 186ad23a2dbSjohansen 187ad23a2dbSjohansen /* 188ad23a2dbSjohansen * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a 189ad23a2dbSjohansen * crashdump if the kernel panics, so use it judiciously. Obviously, it's 190ad23a2dbSjohansen * useful to inspect ZFS metadata, but if possible, we should avoid keeping 191ad23a2dbSjohansen * excess / transient data in-core during a crashdump. 192ad23a2dbSjohansen */ 193fa9e4066Sahrens void * 194fa9e4066Sahrens zio_buf_alloc(size_t size) 195fa9e4066Sahrens { 196fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 197fa9e4066Sahrens 198fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 199fa9e4066Sahrens 2001ab7f2deSmaybee return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); 201fa9e4066Sahrens } 202fa9e4066Sahrens 203ad23a2dbSjohansen /* 204ad23a2dbSjohansen * Use zio_data_buf_alloc to allocate data. The data will not appear in a 205ad23a2dbSjohansen * crashdump if the kernel panics. This exists so that we will limit the amount 206ad23a2dbSjohansen * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount 207ad23a2dbSjohansen * of kernel heap dumped to disk when the kernel panics) 208ad23a2dbSjohansen */ 209ad23a2dbSjohansen void * 210ad23a2dbSjohansen zio_data_buf_alloc(size_t size) 211ad23a2dbSjohansen { 212ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 213ad23a2dbSjohansen 214ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 215ad23a2dbSjohansen 2161ab7f2deSmaybee return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); 217ad23a2dbSjohansen } 218ad23a2dbSjohansen 219fa9e4066Sahrens void 220fa9e4066Sahrens zio_buf_free(void *buf, size_t size) 221fa9e4066Sahrens { 222fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 223fa9e4066Sahrens 224fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 225fa9e4066Sahrens 226fa9e4066Sahrens kmem_cache_free(zio_buf_cache[c], buf); 227fa9e4066Sahrens } 228fa9e4066Sahrens 229ad23a2dbSjohansen void 230ad23a2dbSjohansen zio_data_buf_free(void *buf, size_t size) 231ad23a2dbSjohansen { 232ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 233ad23a2dbSjohansen 234ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 235ad23a2dbSjohansen 236ad23a2dbSjohansen kmem_cache_free(zio_data_buf_cache[c], buf); 237ad23a2dbSjohansen } 238b3995adbSahrens 239fa9e4066Sahrens /* 240fa9e4066Sahrens * ========================================================================== 241fa9e4066Sahrens * Push and pop I/O transform buffers 242fa9e4066Sahrens * ========================================================================== 243fa9e4066Sahrens */ 244fa9e4066Sahrens static void 245e14bb325SJeff Bonwick zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, 246e14bb325SJeff Bonwick zio_transform_func_t *transform) 247fa9e4066Sahrens { 248fa9e4066Sahrens zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); 249fa9e4066Sahrens 250e14bb325SJeff Bonwick zt->zt_orig_data = zio->io_data; 251e14bb325SJeff Bonwick zt->zt_orig_size = zio->io_size; 252fa9e4066Sahrens zt->zt_bufsize = bufsize; 253e14bb325SJeff Bonwick zt->zt_transform = transform; 254fa9e4066Sahrens 255fa9e4066Sahrens zt->zt_next = zio->io_transform_stack; 256fa9e4066Sahrens zio->io_transform_stack = zt; 257fa9e4066Sahrens 258fa9e4066Sahrens zio->io_data = data; 259fa9e4066Sahrens zio->io_size = size; 260fa9e4066Sahrens } 261fa9e4066Sahrens 262fa9e4066Sahrens static void 263e14bb325SJeff Bonwick zio_pop_transforms(zio_t *zio) 264fa9e4066Sahrens { 265e14bb325SJeff Bonwick zio_transform_t *zt; 266e14bb325SJeff Bonwick 267e14bb325SJeff Bonwick while ((zt = zio->io_transform_stack) != NULL) { 268e14bb325SJeff Bonwick if (zt->zt_transform != NULL) 269e14bb325SJeff Bonwick zt->zt_transform(zio, 270e14bb325SJeff Bonwick zt->zt_orig_data, zt->zt_orig_size); 271fa9e4066Sahrens 272*b24ab676SJeff Bonwick if (zt->zt_bufsize != 0) 273*b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zt->zt_bufsize); 274fa9e4066Sahrens 275e14bb325SJeff Bonwick zio->io_data = zt->zt_orig_data; 276e14bb325SJeff Bonwick zio->io_size = zt->zt_orig_size; 277e14bb325SJeff Bonwick zio->io_transform_stack = zt->zt_next; 278fa9e4066Sahrens 279e14bb325SJeff Bonwick kmem_free(zt, sizeof (zio_transform_t)); 280fa9e4066Sahrens } 281fa9e4066Sahrens } 282fa9e4066Sahrens 283e14bb325SJeff Bonwick /* 284e14bb325SJeff Bonwick * ========================================================================== 285e14bb325SJeff Bonwick * I/O transform callbacks for subblocks and decompression 286e14bb325SJeff Bonwick * ========================================================================== 287e14bb325SJeff Bonwick */ 288e14bb325SJeff Bonwick static void 289e14bb325SJeff Bonwick zio_subblock(zio_t *zio, void *data, uint64_t size) 290e14bb325SJeff Bonwick { 291e14bb325SJeff Bonwick ASSERT(zio->io_size > size); 292e14bb325SJeff Bonwick 293e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ) 294e14bb325SJeff Bonwick bcopy(zio->io_data, data, size); 295e14bb325SJeff Bonwick } 296e14bb325SJeff Bonwick 297e14bb325SJeff Bonwick static void 298e14bb325SJeff Bonwick zio_decompress(zio_t *zio, void *data, uint64_t size) 299e14bb325SJeff Bonwick { 300e14bb325SJeff Bonwick if (zio->io_error == 0 && 301e14bb325SJeff Bonwick zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), 302*b24ab676SJeff Bonwick zio->io_data, data, zio->io_size, size) != 0) 303e14bb325SJeff Bonwick zio->io_error = EIO; 304e14bb325SJeff Bonwick } 305e14bb325SJeff Bonwick 306e14bb325SJeff Bonwick /* 307e14bb325SJeff Bonwick * ========================================================================== 308e14bb325SJeff Bonwick * I/O parent/child relationships and pipeline interlocks 309e14bb325SJeff Bonwick * ========================================================================== 310e14bb325SJeff Bonwick */ 311a3f829aeSBill Moore /* 312a3f829aeSBill Moore * NOTE - Callers to zio_walk_parents() and zio_walk_children must 313a3f829aeSBill Moore * continue calling these functions until they return NULL. 314a3f829aeSBill Moore * Otherwise, the next caller will pick up the list walk in 315a3f829aeSBill Moore * some indeterminate state. (Otherwise every caller would 316a3f829aeSBill Moore * have to pass in a cookie to keep the state represented by 317a3f829aeSBill Moore * io_walk_link, which gets annoying.) 318a3f829aeSBill Moore */ 319a3f829aeSBill Moore zio_t * 320a3f829aeSBill Moore zio_walk_parents(zio_t *cio) 321a3f829aeSBill Moore { 322a3f829aeSBill Moore zio_link_t *zl = cio->io_walk_link; 323a3f829aeSBill Moore list_t *pl = &cio->io_parent_list; 324e14bb325SJeff Bonwick 325a3f829aeSBill Moore zl = (zl == NULL) ? list_head(pl) : list_next(pl, zl); 326a3f829aeSBill Moore cio->io_walk_link = zl; 327a3f829aeSBill Moore 328a3f829aeSBill Moore if (zl == NULL) 329a3f829aeSBill Moore return (NULL); 330a3f829aeSBill Moore 331a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 332a3f829aeSBill Moore return (zl->zl_parent); 333a3f829aeSBill Moore } 334a3f829aeSBill Moore 335a3f829aeSBill Moore zio_t * 336a3f829aeSBill Moore zio_walk_children(zio_t *pio) 337a3f829aeSBill Moore { 338a3f829aeSBill Moore zio_link_t *zl = pio->io_walk_link; 339a3f829aeSBill Moore list_t *cl = &pio->io_child_list; 340a3f829aeSBill Moore 341a3f829aeSBill Moore zl = (zl == NULL) ? list_head(cl) : list_next(cl, zl); 342a3f829aeSBill Moore pio->io_walk_link = zl; 343a3f829aeSBill Moore 344a3f829aeSBill Moore if (zl == NULL) 345a3f829aeSBill Moore return (NULL); 346a3f829aeSBill Moore 347a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 348a3f829aeSBill Moore return (zl->zl_child); 349a3f829aeSBill Moore } 350a3f829aeSBill Moore 351a3f829aeSBill Moore zio_t * 352a3f829aeSBill Moore zio_unique_parent(zio_t *cio) 353a3f829aeSBill Moore { 354a3f829aeSBill Moore zio_t *pio = zio_walk_parents(cio); 355a3f829aeSBill Moore 356a3f829aeSBill Moore VERIFY(zio_walk_parents(cio) == NULL); 357a3f829aeSBill Moore return (pio); 358a3f829aeSBill Moore } 359a3f829aeSBill Moore 360a3f829aeSBill Moore void 361a3f829aeSBill Moore zio_add_child(zio_t *pio, zio_t *cio) 362e14bb325SJeff Bonwick { 363a3f829aeSBill Moore zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); 364a3f829aeSBill Moore 365a3f829aeSBill Moore /* 366a3f829aeSBill Moore * Logical I/Os can have logical, gang, or vdev children. 367a3f829aeSBill Moore * Gang I/Os can have gang or vdev children. 368a3f829aeSBill Moore * Vdev I/Os can only have vdev children. 369a3f829aeSBill Moore * The following ASSERT captures all of these constraints. 370a3f829aeSBill Moore */ 371a3f829aeSBill Moore ASSERT(cio->io_child_type <= pio->io_child_type); 372a3f829aeSBill Moore 373a3f829aeSBill Moore zl->zl_parent = pio; 374a3f829aeSBill Moore zl->zl_child = cio; 375a3f829aeSBill Moore 376a3f829aeSBill Moore mutex_enter(&cio->io_lock); 377e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 378a3f829aeSBill Moore 379a3f829aeSBill Moore ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); 380a3f829aeSBill Moore 381a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 382a3f829aeSBill Moore pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; 383a3f829aeSBill Moore 384a3f829aeSBill Moore list_insert_head(&pio->io_child_list, zl); 385a3f829aeSBill Moore list_insert_head(&cio->io_parent_list, zl); 386a3f829aeSBill Moore 387*b24ab676SJeff Bonwick pio->io_child_count++; 388*b24ab676SJeff Bonwick cio->io_parent_count++; 389*b24ab676SJeff Bonwick 390e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 391a3f829aeSBill Moore mutex_exit(&cio->io_lock); 392e14bb325SJeff Bonwick } 393e14bb325SJeff Bonwick 394fa9e4066Sahrens static void 395a3f829aeSBill Moore zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) 396e14bb325SJeff Bonwick { 397a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 398a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 399e14bb325SJeff Bonwick 400a3f829aeSBill Moore mutex_enter(&cio->io_lock); 401e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 402a3f829aeSBill Moore 403a3f829aeSBill Moore list_remove(&pio->io_child_list, zl); 404a3f829aeSBill Moore list_remove(&cio->io_parent_list, zl); 405a3f829aeSBill Moore 406*b24ab676SJeff Bonwick pio->io_child_count--; 407*b24ab676SJeff Bonwick cio->io_parent_count--; 408*b24ab676SJeff Bonwick 409e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 410a3f829aeSBill Moore mutex_exit(&cio->io_lock); 411a3f829aeSBill Moore 412a3f829aeSBill Moore kmem_cache_free(zio_link_cache, zl); 413e14bb325SJeff Bonwick } 414e14bb325SJeff Bonwick 415e14bb325SJeff Bonwick static boolean_t 416e14bb325SJeff Bonwick zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) 417fa9e4066Sahrens { 418e14bb325SJeff Bonwick uint64_t *countp = &zio->io_children[child][wait]; 419e14bb325SJeff Bonwick boolean_t waiting = B_FALSE; 420e14bb325SJeff Bonwick 421e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 422e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 423e14bb325SJeff Bonwick if (*countp != 0) { 424*b24ab676SJeff Bonwick zio->io_stage >>= 1; 425e14bb325SJeff Bonwick zio->io_stall = countp; 426e14bb325SJeff Bonwick waiting = B_TRUE; 427e14bb325SJeff Bonwick } 428e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 429e14bb325SJeff Bonwick 430e14bb325SJeff Bonwick return (waiting); 431e14bb325SJeff Bonwick } 432fa9e4066Sahrens 433e14bb325SJeff Bonwick static void 434e14bb325SJeff Bonwick zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) 435e14bb325SJeff Bonwick { 436e14bb325SJeff Bonwick uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; 437e14bb325SJeff Bonwick int *errorp = &pio->io_child_error[zio->io_child_type]; 438fa9e4066Sahrens 439e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 440e14bb325SJeff Bonwick if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 441e14bb325SJeff Bonwick *errorp = zio_worst_error(*errorp, zio->io_error); 442e14bb325SJeff Bonwick pio->io_reexecute |= zio->io_reexecute; 443e14bb325SJeff Bonwick ASSERT3U(*countp, >, 0); 444e14bb325SJeff Bonwick if (--*countp == 0 && pio->io_stall == countp) { 445e14bb325SJeff Bonwick pio->io_stall = NULL; 446e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 447e14bb325SJeff Bonwick zio_execute(pio); 448e14bb325SJeff Bonwick } else { 449e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 450fa9e4066Sahrens } 451fa9e4066Sahrens } 452fa9e4066Sahrens 453e14bb325SJeff Bonwick static void 454e14bb325SJeff Bonwick zio_inherit_child_errors(zio_t *zio, enum zio_child c) 455e14bb325SJeff Bonwick { 456e14bb325SJeff Bonwick if (zio->io_child_error[c] != 0 && zio->io_error == 0) 457e14bb325SJeff Bonwick zio->io_error = zio->io_child_error[c]; 458e14bb325SJeff Bonwick } 459e14bb325SJeff Bonwick 460fa9e4066Sahrens /* 461fa9e4066Sahrens * ========================================================================== 462e14bb325SJeff Bonwick * Create the various types of I/O (read, write, free, etc) 463fa9e4066Sahrens * ========================================================================== 464fa9e4066Sahrens */ 465fa9e4066Sahrens static zio_t * 466*b24ab676SJeff Bonwick zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 467fa9e4066Sahrens void *data, uint64_t size, zio_done_func_t *done, void *private, 468*b24ab676SJeff Bonwick zio_type_t type, int priority, enum zio_flag flags, 469*b24ab676SJeff Bonwick vdev_t *vd, uint64_t offset, const zbookmark_t *zb, 470*b24ab676SJeff Bonwick enum zio_stage stage, enum zio_stage pipeline) 471fa9e4066Sahrens { 472fa9e4066Sahrens zio_t *zio; 473fa9e4066Sahrens 474fa9e4066Sahrens ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); 475fa9e4066Sahrens ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); 476e14bb325SJeff Bonwick ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); 477fa9e4066Sahrens 478e14bb325SJeff Bonwick ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); 479e14bb325SJeff Bonwick ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); 480e14bb325SJeff Bonwick ASSERT(vd || stage == ZIO_STAGE_OPEN); 481088f3894Sahrens 482ccae0b50Seschrock zio = kmem_cache_alloc(zio_cache, KM_SLEEP); 483ccae0b50Seschrock bzero(zio, sizeof (zio_t)); 484e14bb325SJeff Bonwick 485e14bb325SJeff Bonwick mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); 486e14bb325SJeff Bonwick cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); 487e14bb325SJeff Bonwick 488a3f829aeSBill Moore list_create(&zio->io_parent_list, sizeof (zio_link_t), 489a3f829aeSBill Moore offsetof(zio_link_t, zl_parent_node)); 490a3f829aeSBill Moore list_create(&zio->io_child_list, sizeof (zio_link_t), 491a3f829aeSBill Moore offsetof(zio_link_t, zl_child_node)); 492a3f829aeSBill Moore 493e14bb325SJeff Bonwick if (vd != NULL) 494e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_VDEV; 495e14bb325SJeff Bonwick else if (flags & ZIO_FLAG_GANG_CHILD) 496e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_GANG; 497*b24ab676SJeff Bonwick else if (flags & ZIO_FLAG_DDT_CHILD) 498*b24ab676SJeff Bonwick zio->io_child_type = ZIO_CHILD_DDT; 499e14bb325SJeff Bonwick else 500e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_LOGICAL; 501e14bb325SJeff Bonwick 502fa9e4066Sahrens if (bp != NULL) { 503*b24ab676SJeff Bonwick zio->io_bp = (blkptr_t *)bp; 504fa9e4066Sahrens zio->io_bp_copy = *bp; 505fa9e4066Sahrens zio->io_bp_orig = *bp; 506*b24ab676SJeff Bonwick if (type != ZIO_TYPE_WRITE || 507*b24ab676SJeff Bonwick zio->io_child_type == ZIO_CHILD_DDT) 508e14bb325SJeff Bonwick zio->io_bp = &zio->io_bp_copy; /* so caller can free */ 509f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL) 510e14bb325SJeff Bonwick zio->io_logical = zio; 511f5383399SBill Moore if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) 512f5383399SBill Moore pipeline |= ZIO_GANG_STAGES; 513fa9e4066Sahrens } 514e14bb325SJeff Bonwick 515e14bb325SJeff Bonwick zio->io_spa = spa; 516e14bb325SJeff Bonwick zio->io_txg = txg; 517fa9e4066Sahrens zio->io_done = done; 518fa9e4066Sahrens zio->io_private = private; 519fa9e4066Sahrens zio->io_type = type; 520fa9e4066Sahrens zio->io_priority = priority; 521e14bb325SJeff Bonwick zio->io_vd = vd; 522e14bb325SJeff Bonwick zio->io_offset = offset; 523*b24ab676SJeff Bonwick zio->io_orig_data = zio->io_data = data; 524*b24ab676SJeff Bonwick zio->io_orig_size = zio->io_size = size; 525e14bb325SJeff Bonwick zio->io_orig_flags = zio->io_flags = flags; 526e14bb325SJeff Bonwick zio->io_orig_stage = zio->io_stage = stage; 527e14bb325SJeff Bonwick zio->io_orig_pipeline = zio->io_pipeline = pipeline; 528fa9e4066Sahrens 529a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); 530a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); 531a3f829aeSBill Moore 532e14bb325SJeff Bonwick if (zb != NULL) 533e14bb325SJeff Bonwick zio->io_bookmark = *zb; 534e14bb325SJeff Bonwick 535e14bb325SJeff Bonwick if (pio != NULL) { 536e14bb325SJeff Bonwick if (zio->io_logical == NULL) 537ea8dc4b6Seschrock zio->io_logical = pio->io_logical; 538f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_GANG) 539f5383399SBill Moore zio->io_gang_leader = pio->io_gang_leader; 540e14bb325SJeff Bonwick zio_add_child(pio, zio); 541fa9e4066Sahrens } 542fa9e4066Sahrens 543fa9e4066Sahrens return (zio); 544fa9e4066Sahrens } 545fa9e4066Sahrens 5460a4e9518Sgw static void 547e14bb325SJeff Bonwick zio_destroy(zio_t *zio) 5480a4e9518Sgw { 549a3f829aeSBill Moore list_destroy(&zio->io_parent_list); 550a3f829aeSBill Moore list_destroy(&zio->io_child_list); 551e14bb325SJeff Bonwick mutex_destroy(&zio->io_lock); 552e14bb325SJeff Bonwick cv_destroy(&zio->io_cv); 553e14bb325SJeff Bonwick kmem_cache_free(zio_cache, zio); 5540a4e9518Sgw } 5550a4e9518Sgw 556fa9e4066Sahrens zio_t * 557a3f829aeSBill Moore zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, 558*b24ab676SJeff Bonwick void *private, enum zio_flag flags) 559fa9e4066Sahrens { 560fa9e4066Sahrens zio_t *zio; 561fa9e4066Sahrens 562fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 563a3f829aeSBill Moore ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 564e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); 565fa9e4066Sahrens 566fa9e4066Sahrens return (zio); 567fa9e4066Sahrens } 568fa9e4066Sahrens 569fa9e4066Sahrens zio_t * 570*b24ab676SJeff Bonwick zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) 571fa9e4066Sahrens { 572a3f829aeSBill Moore return (zio_null(NULL, spa, NULL, done, private, flags)); 573fa9e4066Sahrens } 574fa9e4066Sahrens 575fa9e4066Sahrens zio_t * 576e14bb325SJeff Bonwick zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 577e14bb325SJeff Bonwick void *data, uint64_t size, zio_done_func_t *done, void *private, 578*b24ab676SJeff Bonwick int priority, enum zio_flag flags, const zbookmark_t *zb) 579fa9e4066Sahrens { 580fa9e4066Sahrens zio_t *zio; 581fa9e4066Sahrens 582*b24ab676SJeff Bonwick zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, 583088f3894Sahrens data, size, done, private, 584e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, NULL, 0, zb, 585*b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 586*b24ab676SJeff Bonwick ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); 587fa9e4066Sahrens 588fa9e4066Sahrens return (zio); 589fa9e4066Sahrens } 590fa9e4066Sahrens 591fa9e4066Sahrens zio_t * 592e14bb325SJeff Bonwick zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 593*b24ab676SJeff Bonwick void *data, uint64_t size, const zio_prop_t *zp, 594e14bb325SJeff Bonwick zio_done_func_t *ready, zio_done_func_t *done, void *private, 595*b24ab676SJeff Bonwick int priority, enum zio_flag flags, const zbookmark_t *zb) 596fa9e4066Sahrens { 597fa9e4066Sahrens zio_t *zio; 598fa9e4066Sahrens 599e14bb325SJeff Bonwick ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && 600e14bb325SJeff Bonwick zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && 601e14bb325SJeff Bonwick zp->zp_compress >= ZIO_COMPRESS_OFF && 602e14bb325SJeff Bonwick zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && 603e14bb325SJeff Bonwick zp->zp_type < DMU_OT_NUMTYPES && 604e14bb325SJeff Bonwick zp->zp_level < 32 && 605*b24ab676SJeff Bonwick zp->zp_copies > 0 && 606*b24ab676SJeff Bonwick zp->zp_copies <= spa_max_replication(spa) && 607*b24ab676SJeff Bonwick zp->zp_dedup <= 1 && 608*b24ab676SJeff Bonwick zp->zp_dedup_verify <= 1); 6090a4e9518Sgw 610fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 611e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 612*b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 613*b24ab676SJeff Bonwick ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); 614fa9e4066Sahrens 615c717a561Smaybee zio->io_ready = ready; 616e14bb325SJeff Bonwick zio->io_prop = *zp; 617fa9e4066Sahrens 618fa9e4066Sahrens return (zio); 619fa9e4066Sahrens } 620fa9e4066Sahrens 621fa9e4066Sahrens zio_t * 622e14bb325SJeff Bonwick zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, 623e14bb325SJeff Bonwick uint64_t size, zio_done_func_t *done, void *private, int priority, 624*b24ab676SJeff Bonwick enum zio_flag flags, zbookmark_t *zb) 625fa9e4066Sahrens { 626fa9e4066Sahrens zio_t *zio; 627fa9e4066Sahrens 628fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 629e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 630e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); 631fa9e4066Sahrens 632fa9e4066Sahrens return (zio); 633fa9e4066Sahrens } 634fa9e4066Sahrens 635*b24ab676SJeff Bonwick void 636*b24ab676SJeff Bonwick zio_write_override(zio_t *zio, blkptr_t *bp, int copies) 637*b24ab676SJeff Bonwick { 638*b24ab676SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 639*b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 640*b24ab676SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 641*b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); 642*b24ab676SJeff Bonwick 643*b24ab676SJeff Bonwick zio->io_prop.zp_copies = copies; 644*b24ab676SJeff Bonwick zio->io_bp_override = bp; 645*b24ab676SJeff Bonwick } 646*b24ab676SJeff Bonwick 647*b24ab676SJeff Bonwick void 648*b24ab676SJeff Bonwick zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) 649*b24ab676SJeff Bonwick { 650*b24ab676SJeff Bonwick bplist_enqueue_deferred(&spa->spa_free_bplist[txg & TXG_MASK], bp); 651*b24ab676SJeff Bonwick } 652*b24ab676SJeff Bonwick 653fa9e4066Sahrens zio_t * 654*b24ab676SJeff Bonwick zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 655*b24ab676SJeff Bonwick enum zio_flag flags) 656fa9e4066Sahrens { 657fa9e4066Sahrens zio_t *zio; 658fa9e4066Sahrens 659fa9e4066Sahrens ASSERT(!BP_IS_HOLE(bp)); 660*b24ab676SJeff Bonwick ASSERT(spa_syncing_txg(spa) == txg); 661*b24ab676SJeff Bonwick ASSERT(spa_sync_pass(spa) <= SYNC_PASS_DEFERRED_FREE); 662fa9e4066Sahrens 663e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 664*b24ab676SJeff Bonwick NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, flags, 665e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_FREE_PIPELINE); 666fa9e4066Sahrens 667fa9e4066Sahrens return (zio); 668fa9e4066Sahrens } 669fa9e4066Sahrens 670fa9e4066Sahrens zio_t * 671*b24ab676SJeff Bonwick zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 672*b24ab676SJeff Bonwick zio_done_func_t *done, void *private, enum zio_flag flags) 673fa9e4066Sahrens { 674fa9e4066Sahrens zio_t *zio; 675fa9e4066Sahrens 676fa9e4066Sahrens /* 677fa9e4066Sahrens * A claim is an allocation of a specific block. Claims are needed 678fa9e4066Sahrens * to support immediate writes in the intent log. The issue is that 679fa9e4066Sahrens * immediate writes contain committed data, but in a txg that was 680fa9e4066Sahrens * *not* committed. Upon opening the pool after an unclean shutdown, 681fa9e4066Sahrens * the intent log claims all blocks that contain immediate write data 682fa9e4066Sahrens * so that the SPA knows they're in use. 683fa9e4066Sahrens * 684fa9e4066Sahrens * All claims *must* be resolved in the first txg -- before the SPA 685fa9e4066Sahrens * starts allocating blocks -- so that nothing is allocated twice. 686*b24ab676SJeff Bonwick * If txg == 0 we just verify that the block is claimable. 687fa9e4066Sahrens */ 688fa9e4066Sahrens ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); 689*b24ab676SJeff Bonwick ASSERT(txg == spa_first_txg(spa) || txg == 0); 690*b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ 691fa9e4066Sahrens 692e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 693e14bb325SJeff Bonwick done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, 694e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); 695fa9e4066Sahrens 696fa9e4066Sahrens return (zio); 697fa9e4066Sahrens } 698fa9e4066Sahrens 699fa9e4066Sahrens zio_t * 700fa9e4066Sahrens zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 701*b24ab676SJeff Bonwick zio_done_func_t *done, void *private, int priority, enum zio_flag flags) 702fa9e4066Sahrens { 703fa9e4066Sahrens zio_t *zio; 704fa9e4066Sahrens int c; 705fa9e4066Sahrens 706fa9e4066Sahrens if (vd->vdev_children == 0) { 707fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 708e14bb325SJeff Bonwick ZIO_TYPE_IOCTL, priority, flags, vd, 0, NULL, 709fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); 710fa9e4066Sahrens 711fa9e4066Sahrens zio->io_cmd = cmd; 712fa9e4066Sahrens } else { 713a3f829aeSBill Moore zio = zio_null(pio, spa, NULL, NULL, NULL, flags); 714fa9e4066Sahrens 715fa9e4066Sahrens for (c = 0; c < vd->vdev_children; c++) 716fa9e4066Sahrens zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, 717fa9e4066Sahrens done, private, priority, flags)); 718fa9e4066Sahrens } 719fa9e4066Sahrens 720fa9e4066Sahrens return (zio); 721fa9e4066Sahrens } 722fa9e4066Sahrens 723fa9e4066Sahrens zio_t * 724fa9e4066Sahrens zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 725fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 726*b24ab676SJeff Bonwick int priority, enum zio_flag flags, boolean_t labels) 727fa9e4066Sahrens { 728fa9e4066Sahrens zio_t *zio; 7290a4e9518Sgw 730e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 731e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 732e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 733e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 734fa9e4066Sahrens 735e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 736e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, vd, offset, NULL, 737fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); 738fa9e4066Sahrens 739e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 740fa9e4066Sahrens 741fa9e4066Sahrens return (zio); 742fa9e4066Sahrens } 743fa9e4066Sahrens 744fa9e4066Sahrens zio_t * 745fa9e4066Sahrens zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 746fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 747*b24ab676SJeff Bonwick int priority, enum zio_flag flags, boolean_t labels) 748fa9e4066Sahrens { 749fa9e4066Sahrens zio_t *zio; 7500a4e9518Sgw 751e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 752e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 753e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 754e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 755fa9e4066Sahrens 756e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 757e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL, 758fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); 759fa9e4066Sahrens 760e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 761fa9e4066Sahrens 762fa9e4066Sahrens if (zio_checksum_table[checksum].ci_zbt) { 763fa9e4066Sahrens /* 764fa9e4066Sahrens * zbt checksums are necessarily destructive -- they modify 765e14bb325SJeff Bonwick * the end of the write buffer to hold the verifier/checksum. 766fa9e4066Sahrens * Therefore, we must make a local copy in case the data is 767e14bb325SJeff Bonwick * being written to multiple places in parallel. 768fa9e4066Sahrens */ 769e14bb325SJeff Bonwick void *wbuf = zio_buf_alloc(size); 770fa9e4066Sahrens bcopy(data, wbuf, size); 771e14bb325SJeff Bonwick zio_push_transform(zio, wbuf, size, size, NULL); 772fa9e4066Sahrens } 773fa9e4066Sahrens 774fa9e4066Sahrens return (zio); 775fa9e4066Sahrens } 776fa9e4066Sahrens 777fa9e4066Sahrens /* 778e14bb325SJeff Bonwick * Create a child I/O to do some work for us. 779fa9e4066Sahrens */ 780fa9e4066Sahrens zio_t * 781e14bb325SJeff Bonwick zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, 782*b24ab676SJeff Bonwick void *data, uint64_t size, int type, int priority, enum zio_flag flags, 783fa9e4066Sahrens zio_done_func_t *done, void *private) 784fa9e4066Sahrens { 785*b24ab676SJeff Bonwick enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; 786e14bb325SJeff Bonwick zio_t *zio; 787e14bb325SJeff Bonwick 788e14bb325SJeff Bonwick ASSERT(vd->vdev_parent == 789e14bb325SJeff Bonwick (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); 790fa9e4066Sahrens 791fa9e4066Sahrens if (type == ZIO_TYPE_READ && bp != NULL) { 792fa9e4066Sahrens /* 793fa9e4066Sahrens * If we have the bp, then the child should perform the 794fa9e4066Sahrens * checksum and the parent need not. This pushes error 795fa9e4066Sahrens * detection as close to the leaves as possible and 796fa9e4066Sahrens * eliminates redundant checksums in the interior nodes. 797fa9e4066Sahrens */ 798*b24ab676SJeff Bonwick pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; 799*b24ab676SJeff Bonwick pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 800fa9e4066Sahrens } 801fa9e4066Sahrens 802e14bb325SJeff Bonwick if (vd->vdev_children == 0) 803e14bb325SJeff Bonwick offset += VDEV_LABEL_START_SIZE; 804e14bb325SJeff Bonwick 805*b24ab676SJeff Bonwick flags |= ZIO_VDEV_CHILD_FLAGS(pio) | ZIO_FLAG_DONT_PROPAGATE; 806*b24ab676SJeff Bonwick 807*b24ab676SJeff Bonwick /* 808*b24ab676SJeff Bonwick * If we've decided to do a repair, the write is not speculative -- 809*b24ab676SJeff Bonwick * even if the original read was. 810*b24ab676SJeff Bonwick */ 811*b24ab676SJeff Bonwick if (flags & ZIO_FLAG_IO_REPAIR) 812*b24ab676SJeff Bonwick flags &= ~ZIO_FLAG_SPECULATIVE; 813*b24ab676SJeff Bonwick 814e14bb325SJeff Bonwick zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, 815*b24ab676SJeff Bonwick done, private, type, priority, flags, vd, offset, &pio->io_bookmark, 816*b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, pipeline); 817fa9e4066Sahrens 818e14bb325SJeff Bonwick return (zio); 81932b87932Sek } 82032b87932Sek 821e14bb325SJeff Bonwick zio_t * 822e14bb325SJeff Bonwick zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, 823*b24ab676SJeff Bonwick int type, int priority, enum zio_flag flags, 824*b24ab676SJeff Bonwick zio_done_func_t *done, void *private) 825fa9e4066Sahrens { 826e14bb325SJeff Bonwick zio_t *zio; 827fa9e4066Sahrens 828e14bb325SJeff Bonwick ASSERT(vd->vdev_ops->vdev_op_leaf); 829fa9e4066Sahrens 830e14bb325SJeff Bonwick zio = zio_create(NULL, vd->vdev_spa, 0, NULL, 831e14bb325SJeff Bonwick data, size, done, private, type, priority, 832e14bb325SJeff Bonwick flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY, 833e14bb325SJeff Bonwick vd, offset, NULL, 834*b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); 835fa9e4066Sahrens 836e14bb325SJeff Bonwick return (zio); 837e05725b1Sbonwick } 838e05725b1Sbonwick 839e05725b1Sbonwick void 840e14bb325SJeff Bonwick zio_flush(zio_t *zio, vdev_t *vd) 841e05725b1Sbonwick { 842e14bb325SJeff Bonwick zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, 843e14bb325SJeff Bonwick NULL, NULL, ZIO_PRIORITY_NOW, 844e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); 845fa9e4066Sahrens } 846fa9e4066Sahrens 847fa9e4066Sahrens /* 848fa9e4066Sahrens * ========================================================================== 849e14bb325SJeff Bonwick * Prepare to read and write logical blocks 850fa9e4066Sahrens * ========================================================================== 851fa9e4066Sahrens */ 852e14bb325SJeff Bonwick 853e05725b1Sbonwick static int 854e14bb325SJeff Bonwick zio_read_bp_init(zio_t *zio) 855fa9e4066Sahrens { 856e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 857e05725b1Sbonwick 85803361682SJeff Bonwick if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && 859f5383399SBill Moore zio->io_child_type == ZIO_CHILD_LOGICAL && 860f5383399SBill Moore !(zio->io_flags & ZIO_FLAG_RAW)) { 861*b24ab676SJeff Bonwick uint64_t psize = BP_GET_PSIZE(bp); 862*b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(psize); 863e05725b1Sbonwick 864*b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, psize, zio_decompress); 865e14bb325SJeff Bonwick } 866fa9e4066Sahrens 867e14bb325SJeff Bonwick if (!dmu_ot[BP_GET_TYPE(bp)].ot_metadata && BP_GET_LEVEL(bp) == 0) 868e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 869fa9e4066Sahrens 870*b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) 871*b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_READ_PIPELINE; 872*b24ab676SJeff Bonwick 873e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 874fa9e4066Sahrens } 875fa9e4066Sahrens 876e05725b1Sbonwick static int 877e14bb325SJeff Bonwick zio_write_bp_init(zio_t *zio) 8780a4e9518Sgw { 879*b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 880e14bb325SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 881*b24ab676SJeff Bonwick enum zio_compress compress = zp->zp_compress; 882e05725b1Sbonwick blkptr_t *bp = zio->io_bp; 883e14bb325SJeff Bonwick uint64_t lsize = zio->io_size; 884*b24ab676SJeff Bonwick uint64_t psize = lsize; 885e14bb325SJeff Bonwick int pass = 1; 886e05725b1Sbonwick 887e14bb325SJeff Bonwick /* 888e14bb325SJeff Bonwick * If our children haven't all reached the ready stage, 889e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 890e14bb325SJeff Bonwick */ 891e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 892e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) 893e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 8940a4e9518Sgw 895e14bb325SJeff Bonwick if (!IO_IS_ALLOCATING(zio)) 896e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 8970a4e9518Sgw 898*b24ab676SJeff Bonwick ASSERT(zio->io_child_type != ZIO_CHILD_DDT); 899*b24ab676SJeff Bonwick 900*b24ab676SJeff Bonwick if (zio->io_bp_override) { 901*b24ab676SJeff Bonwick ASSERT(bp->blk_birth != zio->io_txg); 902*b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); 903*b24ab676SJeff Bonwick 904*b24ab676SJeff Bonwick *bp = *zio->io_bp_override; 905*b24ab676SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 906*b24ab676SJeff Bonwick 907*b24ab676SJeff Bonwick if (BP_IS_HOLE(bp) || !zp->zp_dedup) 908*b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 909*b24ab676SJeff Bonwick 910*b24ab676SJeff Bonwick ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup || 911*b24ab676SJeff Bonwick zp->zp_dedup_verify); 912*b24ab676SJeff Bonwick 913*b24ab676SJeff Bonwick if (BP_GET_CHECKSUM(bp) == zp->zp_checksum) { 914*b24ab676SJeff Bonwick BP_SET_DEDUP(bp, 1); 915*b24ab676SJeff Bonwick zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; 916*b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 917*b24ab676SJeff Bonwick } 918*b24ab676SJeff Bonwick zio->io_bp_override = NULL; 919*b24ab676SJeff Bonwick BP_ZERO(bp); 920*b24ab676SJeff Bonwick } 9210a4e9518Sgw 922e14bb325SJeff Bonwick if (bp->blk_birth == zio->io_txg) { 923e14bb325SJeff Bonwick /* 924e14bb325SJeff Bonwick * We're rewriting an existing block, which means we're 925e14bb325SJeff Bonwick * working on behalf of spa_sync(). For spa_sync() to 926e14bb325SJeff Bonwick * converge, it must eventually be the case that we don't 927e14bb325SJeff Bonwick * have to allocate new blocks. But compression changes 928e14bb325SJeff Bonwick * the blocksize, which forces a reallocate, and makes 929e14bb325SJeff Bonwick * convergence take longer. Therefore, after the first 930e14bb325SJeff Bonwick * few passes, stop compressing to ensure convergence. 931e14bb325SJeff Bonwick */ 932*b24ab676SJeff Bonwick pass = spa_sync_pass(spa); 933*b24ab676SJeff Bonwick 934*b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(spa)); 935*b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 936*b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp)); 937e05725b1Sbonwick 938e14bb325SJeff Bonwick if (pass > SYNC_PASS_DONT_COMPRESS) 939e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 940e05725b1Sbonwick 941e14bb325SJeff Bonwick /* Make sure someone doesn't change their mind on overwrites */ 942*b24ab676SJeff Bonwick ASSERT(MIN(zp->zp_copies + BP_IS_GANG(bp), 943*b24ab676SJeff Bonwick spa_max_replication(spa)) == BP_GET_NDVAS(bp)); 944e14bb325SJeff Bonwick } 945fa9e4066Sahrens 946e14bb325SJeff Bonwick if (compress != ZIO_COMPRESS_OFF) { 947*b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(lsize); 948*b24ab676SJeff Bonwick psize = zio_compress_data(compress, zio->io_data, cbuf, lsize); 949*b24ab676SJeff Bonwick if (psize == 0 || psize == lsize) { 950e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 951*b24ab676SJeff Bonwick zio_buf_free(cbuf, lsize); 952*b24ab676SJeff Bonwick } else { 953*b24ab676SJeff Bonwick ASSERT(psize < lsize); 954*b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, lsize, NULL); 955e14bb325SJeff Bonwick } 956e14bb325SJeff Bonwick } 957c717a561Smaybee 958e14bb325SJeff Bonwick /* 959e14bb325SJeff Bonwick * The final pass of spa_sync() must be all rewrites, but the first 960e14bb325SJeff Bonwick * few passes offer a trade-off: allocating blocks defers convergence, 961e14bb325SJeff Bonwick * but newly allocated blocks are sequential, so they can be written 962e14bb325SJeff Bonwick * to disk faster. Therefore, we allow the first few passes of 963e14bb325SJeff Bonwick * spa_sync() to allocate new blocks, but force rewrites after that. 964e14bb325SJeff Bonwick * There should only be a handful of blocks after pass 1 in any case. 965e14bb325SJeff Bonwick */ 966*b24ab676SJeff Bonwick if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == psize && 967e14bb325SJeff Bonwick pass > SYNC_PASS_REWRITE) { 968*b24ab676SJeff Bonwick ASSERT(psize != 0); 969*b24ab676SJeff Bonwick enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; 970e14bb325SJeff Bonwick zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; 971e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_REWRITE; 972e14bb325SJeff Bonwick } else { 973e14bb325SJeff Bonwick BP_ZERO(bp); 974e14bb325SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 975e14bb325SJeff Bonwick } 976fa9e4066Sahrens 977*b24ab676SJeff Bonwick if (psize == 0) { 978e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 979e14bb325SJeff Bonwick } else { 980e14bb325SJeff Bonwick ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); 981e14bb325SJeff Bonwick BP_SET_LSIZE(bp, lsize); 982*b24ab676SJeff Bonwick BP_SET_PSIZE(bp, psize); 983e14bb325SJeff Bonwick BP_SET_COMPRESS(bp, compress); 984e14bb325SJeff Bonwick BP_SET_CHECKSUM(bp, zp->zp_checksum); 985e14bb325SJeff Bonwick BP_SET_TYPE(bp, zp->zp_type); 986e14bb325SJeff Bonwick BP_SET_LEVEL(bp, zp->zp_level); 987*b24ab676SJeff Bonwick BP_SET_DEDUP(bp, zp->zp_dedup); 988e14bb325SJeff Bonwick BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 989*b24ab676SJeff Bonwick if (zp->zp_dedup) { 990*b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 991*b24ab676SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 992*b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; 993*b24ab676SJeff Bonwick } 994*b24ab676SJeff Bonwick } 995*b24ab676SJeff Bonwick 996*b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 997*b24ab676SJeff Bonwick } 998*b24ab676SJeff Bonwick 999*b24ab676SJeff Bonwick static int 1000*b24ab676SJeff Bonwick zio_free_bp_init(zio_t *zio) 1001*b24ab676SJeff Bonwick { 1002*b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1003*b24ab676SJeff Bonwick 1004*b24ab676SJeff Bonwick if (zio->io_child_type == ZIO_CHILD_LOGICAL) { 1005*b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp)) 1006*b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; 1007*b24ab676SJeff Bonwick else 1008*b24ab676SJeff Bonwick arc_free(zio->io_spa, bp); 1009e14bb325SJeff Bonwick } 1010fa9e4066Sahrens 1011468c413aSTim Haley if (zio_injection_enabled && 1012468c413aSTim Haley zio->io_spa->spa_syncing_txg == zio->io_txg) 1013468c413aSTim Haley zio_handle_ignored_writes(zio); 1014468c413aSTim Haley 1015e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1016fa9e4066Sahrens } 1017fa9e4066Sahrens 1018e14bb325SJeff Bonwick /* 1019e14bb325SJeff Bonwick * ========================================================================== 1020e14bb325SJeff Bonwick * Execute the I/O pipeline 1021e14bb325SJeff Bonwick * ========================================================================== 1022e14bb325SJeff Bonwick */ 1023e14bb325SJeff Bonwick 1024e14bb325SJeff Bonwick static void 1025e14bb325SJeff Bonwick zio_taskq_dispatch(zio_t *zio, enum zio_taskq_type q) 1026fa9e4066Sahrens { 1027e14bb325SJeff Bonwick zio_type_t t = zio->io_type; 10280a4e9518Sgw 10290a4e9518Sgw /* 1030bbe36defSGeorge Wilson * If we're a config writer or a probe, the normal issue and 1031bbe36defSGeorge Wilson * interrupt threads may all be blocked waiting for the config lock. 1032bbe36defSGeorge Wilson * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. 10330a4e9518Sgw */ 1034bbe36defSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) 1035e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 10360a4e9518Sgw 10370a4e9518Sgw /* 1038e14bb325SJeff Bonwick * A similar issue exists for the L2ARC write thread until L2ARC 2.0. 10390a4e9518Sgw */ 1040e14bb325SJeff Bonwick if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) 1041e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 10420a4e9518Sgw 1043e14bb325SJeff Bonwick (void) taskq_dispatch(zio->io_spa->spa_zio_taskq[t][q], 1044e14bb325SJeff Bonwick (task_func_t *)zio_execute, zio, TQ_SLEEP); 1045e14bb325SJeff Bonwick } 10460a4e9518Sgw 1047e14bb325SJeff Bonwick static boolean_t 1048e14bb325SJeff Bonwick zio_taskq_member(zio_t *zio, enum zio_taskq_type q) 1049e14bb325SJeff Bonwick { 1050e14bb325SJeff Bonwick kthread_t *executor = zio->io_executor; 1051e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 10520a4e9518Sgw 1053e14bb325SJeff Bonwick for (zio_type_t t = 0; t < ZIO_TYPES; t++) 1054e14bb325SJeff Bonwick if (taskq_member(spa->spa_zio_taskq[t][q], executor)) 1055e14bb325SJeff Bonwick return (B_TRUE); 10560a4e9518Sgw 1057e14bb325SJeff Bonwick return (B_FALSE); 1058e14bb325SJeff Bonwick } 1059e05725b1Sbonwick 1060e14bb325SJeff Bonwick static int 1061e14bb325SJeff Bonwick zio_issue_async(zio_t *zio) 1062e14bb325SJeff Bonwick { 1063e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 1064e14bb325SJeff Bonwick 1065e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 10660a4e9518Sgw } 10670a4e9518Sgw 1068e14bb325SJeff Bonwick void 1069e14bb325SJeff Bonwick zio_interrupt(zio_t *zio) 10700a4e9518Sgw { 1071e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT); 1072e14bb325SJeff Bonwick } 10730a4e9518Sgw 1074e14bb325SJeff Bonwick /* 1075e14bb325SJeff Bonwick * Execute the I/O pipeline until one of the following occurs: 1076e14bb325SJeff Bonwick * (1) the I/O completes; (2) the pipeline stalls waiting for 1077e14bb325SJeff Bonwick * dependent child I/Os; (3) the I/O issues, so we're waiting 1078e14bb325SJeff Bonwick * for an I/O completion interrupt; (4) the I/O is delegated by 1079e14bb325SJeff Bonwick * vdev-level caching or aggregation; (5) the I/O is deferred 1080e14bb325SJeff Bonwick * due to vdev-level queueing; (6) the I/O is handed off to 1081e14bb325SJeff Bonwick * another thread. In all cases, the pipeline stops whenever 1082e14bb325SJeff Bonwick * there's no CPU work; it never burns a thread in cv_wait(). 1083e14bb325SJeff Bonwick * 1084e14bb325SJeff Bonwick * There's no locking on io_stage because there's no legitimate way 1085e14bb325SJeff Bonwick * for multiple threads to be attempting to process the same I/O. 1086e14bb325SJeff Bonwick */ 1087*b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[]; 10880a4e9518Sgw 1089e14bb325SJeff Bonwick void 1090e14bb325SJeff Bonwick zio_execute(zio_t *zio) 1091e14bb325SJeff Bonwick { 1092e14bb325SJeff Bonwick zio->io_executor = curthread; 10930a4e9518Sgw 1094e14bb325SJeff Bonwick while (zio->io_stage < ZIO_STAGE_DONE) { 1095*b24ab676SJeff Bonwick enum zio_stage pipeline = zio->io_pipeline; 1096*b24ab676SJeff Bonwick enum zio_stage stage = zio->io_stage; 1097e14bb325SJeff Bonwick int rv; 10980a4e9518Sgw 1099e14bb325SJeff Bonwick ASSERT(!MUTEX_HELD(&zio->io_lock)); 1100*b24ab676SJeff Bonwick ASSERT(ISP2(stage)); 1101*b24ab676SJeff Bonwick ASSERT(zio->io_stall == NULL); 11020a4e9518Sgw 1103*b24ab676SJeff Bonwick do { 1104*b24ab676SJeff Bonwick stage <<= 1; 1105*b24ab676SJeff Bonwick } while ((stage & pipeline) == 0); 1106e14bb325SJeff Bonwick 1107e14bb325SJeff Bonwick ASSERT(stage <= ZIO_STAGE_DONE); 11080a4e9518Sgw 11090a4e9518Sgw /* 1110e14bb325SJeff Bonwick * If we are in interrupt context and this pipeline stage 1111e14bb325SJeff Bonwick * will grab a config lock that is held across I/O, 1112*b24ab676SJeff Bonwick * or may wait for an I/O that needs an interrupt thread 1113*b24ab676SJeff Bonwick * to complete, issue async to avoid deadlock. 11140a4e9518Sgw */ 1115*b24ab676SJeff Bonwick if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && 1116e14bb325SJeff Bonwick zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { 1117e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 1118e14bb325SJeff Bonwick return; 11190a4e9518Sgw } 11200a4e9518Sgw 1121e14bb325SJeff Bonwick zio->io_stage = stage; 1122*b24ab676SJeff Bonwick rv = zio_pipeline[highbit(stage) - 1](zio); 11230a4e9518Sgw 1124e14bb325SJeff Bonwick if (rv == ZIO_PIPELINE_STOP) 1125e14bb325SJeff Bonwick return; 11260a4e9518Sgw 1127e14bb325SJeff Bonwick ASSERT(rv == ZIO_PIPELINE_CONTINUE); 1128e14bb325SJeff Bonwick } 11290a4e9518Sgw } 11300a4e9518Sgw 1131e14bb325SJeff Bonwick /* 1132e14bb325SJeff Bonwick * ========================================================================== 1133e14bb325SJeff Bonwick * Initiate I/O, either sync or async 1134e14bb325SJeff Bonwick * ========================================================================== 1135e14bb325SJeff Bonwick */ 1136e14bb325SJeff Bonwick int 1137e14bb325SJeff Bonwick zio_wait(zio_t *zio) 11380a4e9518Sgw { 1139e14bb325SJeff Bonwick int error; 11400a4e9518Sgw 1141e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 1142e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 11430a4e9518Sgw 1144e14bb325SJeff Bonwick zio->io_waiter = curthread; 1145e05725b1Sbonwick 1146e14bb325SJeff Bonwick zio_execute(zio); 11470a4e9518Sgw 1148e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 1149e14bb325SJeff Bonwick while (zio->io_executor != NULL) 1150e14bb325SJeff Bonwick cv_wait(&zio->io_cv, &zio->io_lock); 1151e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 115232b87932Sek 1153e14bb325SJeff Bonwick error = zio->io_error; 1154e14bb325SJeff Bonwick zio_destroy(zio); 115532b87932Sek 1156e14bb325SJeff Bonwick return (error); 115732b87932Sek } 115832b87932Sek 1159e14bb325SJeff Bonwick void 1160e14bb325SJeff Bonwick zio_nowait(zio_t *zio) 11610a4e9518Sgw { 1162e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 1163fa9e4066Sahrens 1164a3f829aeSBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL && 1165a3f829aeSBill Moore zio_unique_parent(zio) == NULL) { 1166ea8dc4b6Seschrock /* 1167e14bb325SJeff Bonwick * This is a logical async I/O with no parent to wait for it. 116854d692b7SGeorge Wilson * We add it to the spa_async_root_zio "Godfather" I/O which 116954d692b7SGeorge Wilson * will ensure they complete prior to unloading the pool. 1170ea8dc4b6Seschrock */ 1171e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 117254d692b7SGeorge Wilson 117354d692b7SGeorge Wilson zio_add_child(spa->spa_async_zio_root, zio); 1174e14bb325SJeff Bonwick } 1175ea8dc4b6Seschrock 1176e14bb325SJeff Bonwick zio_execute(zio); 1177e14bb325SJeff Bonwick } 1178ea8dc4b6Seschrock 1179e14bb325SJeff Bonwick /* 1180e14bb325SJeff Bonwick * ========================================================================== 1181e14bb325SJeff Bonwick * Reexecute or suspend/resume failed I/O 1182e14bb325SJeff Bonwick * ========================================================================== 1183e14bb325SJeff Bonwick */ 1184fa9e4066Sahrens 1185e14bb325SJeff Bonwick static void 1186e14bb325SJeff Bonwick zio_reexecute(zio_t *pio) 1187e14bb325SJeff Bonwick { 1188a3f829aeSBill Moore zio_t *cio, *cio_next; 1189a3f829aeSBill Moore 1190a3f829aeSBill Moore ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); 1191a3f829aeSBill Moore ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); 1192f5383399SBill Moore ASSERT(pio->io_gang_leader == NULL); 1193f5383399SBill Moore ASSERT(pio->io_gang_tree == NULL); 1194e05725b1Sbonwick 1195e14bb325SJeff Bonwick pio->io_flags = pio->io_orig_flags; 1196e14bb325SJeff Bonwick pio->io_stage = pio->io_orig_stage; 1197e14bb325SJeff Bonwick pio->io_pipeline = pio->io_orig_pipeline; 1198e14bb325SJeff Bonwick pio->io_reexecute = 0; 1199e14bb325SJeff Bonwick pio->io_error = 0; 1200a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1201a3f829aeSBill Moore pio->io_state[w] = 0; 1202e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 1203e14bb325SJeff Bonwick pio->io_child_error[c] = 0; 12040a4e9518Sgw 1205*b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(pio)) 1206*b24ab676SJeff Bonwick BP_ZERO(pio->io_bp); 1207d58459f4Sek 1208e14bb325SJeff Bonwick /* 1209e14bb325SJeff Bonwick * As we reexecute pio's children, new children could be created. 1210a3f829aeSBill Moore * New children go to the head of pio's io_child_list, however, 1211e14bb325SJeff Bonwick * so we will (correctly) not reexecute them. The key is that 1212a3f829aeSBill Moore * the remainder of pio's io_child_list, from 'cio_next' onward, 1213a3f829aeSBill Moore * cannot be affected by any side effects of reexecuting 'cio'. 1214e14bb325SJeff Bonwick */ 1215a3f829aeSBill Moore for (cio = zio_walk_children(pio); cio != NULL; cio = cio_next) { 1216a3f829aeSBill Moore cio_next = zio_walk_children(pio); 1217e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 1218a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1219a3f829aeSBill Moore pio->io_children[cio->io_child_type][w]++; 1220e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 1221a3f829aeSBill Moore zio_reexecute(cio); 1222fa9e4066Sahrens } 1223e05725b1Sbonwick 1224e14bb325SJeff Bonwick /* 1225e14bb325SJeff Bonwick * Now that all children have been reexecuted, execute the parent. 122654d692b7SGeorge Wilson * We don't reexecute "The Godfather" I/O here as it's the 122754d692b7SGeorge Wilson * responsibility of the caller to wait on him. 1228e14bb325SJeff Bonwick */ 122954d692b7SGeorge Wilson if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) 123054d692b7SGeorge Wilson zio_execute(pio); 12310a4e9518Sgw } 12320a4e9518Sgw 1233e14bb325SJeff Bonwick void 1234e14bb325SJeff Bonwick zio_suspend(spa_t *spa, zio_t *zio) 12350a4e9518Sgw { 1236e14bb325SJeff Bonwick if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) 1237e14bb325SJeff Bonwick fm_panic("Pool '%s' has encountered an uncorrectable I/O " 1238e14bb325SJeff Bonwick "failure and the failure mode property for this pool " 1239e14bb325SJeff Bonwick "is set to panic.", spa_name(spa)); 12400a4e9518Sgw 1241e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); 12420a4e9518Sgw 1243e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1244fa9e4066Sahrens 1245e14bb325SJeff Bonwick if (spa->spa_suspend_zio_root == NULL) 124654d692b7SGeorge Wilson spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, 124754d692b7SGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 124854d692b7SGeorge Wilson ZIO_FLAG_GODFATHER); 1249fa9e4066Sahrens 1250e14bb325SJeff Bonwick spa->spa_suspended = B_TRUE; 1251fa9e4066Sahrens 1252e14bb325SJeff Bonwick if (zio != NULL) { 125354d692b7SGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 1254e14bb325SJeff Bonwick ASSERT(zio != spa->spa_suspend_zio_root); 1255e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1256a3f829aeSBill Moore ASSERT(zio_unique_parent(zio) == NULL); 1257e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_DONE); 1258e14bb325SJeff Bonwick zio_add_child(spa->spa_suspend_zio_root, zio); 1259e14bb325SJeff Bonwick } 1260fa9e4066Sahrens 1261e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1262e14bb325SJeff Bonwick } 1263fa9e4066Sahrens 126454d692b7SGeorge Wilson int 1265e14bb325SJeff Bonwick zio_resume(spa_t *spa) 1266e14bb325SJeff Bonwick { 126754d692b7SGeorge Wilson zio_t *pio; 1268fa9e4066Sahrens 1269b3995adbSahrens /* 1270e14bb325SJeff Bonwick * Reexecute all previously suspended i/o. 1271b3995adbSahrens */ 1272e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1273e14bb325SJeff Bonwick spa->spa_suspended = B_FALSE; 1274e14bb325SJeff Bonwick cv_broadcast(&spa->spa_suspend_cv); 1275e14bb325SJeff Bonwick pio = spa->spa_suspend_zio_root; 1276e14bb325SJeff Bonwick spa->spa_suspend_zio_root = NULL; 1277e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1278e14bb325SJeff Bonwick 1279e14bb325SJeff Bonwick if (pio == NULL) 128054d692b7SGeorge Wilson return (0); 1281e14bb325SJeff Bonwick 128254d692b7SGeorge Wilson zio_reexecute(pio); 128354d692b7SGeorge Wilson return (zio_wait(pio)); 1284e14bb325SJeff Bonwick } 1285e14bb325SJeff Bonwick 1286e14bb325SJeff Bonwick void 1287e14bb325SJeff Bonwick zio_resume_wait(spa_t *spa) 1288e14bb325SJeff Bonwick { 1289e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1290e14bb325SJeff Bonwick while (spa_suspended(spa)) 1291e14bb325SJeff Bonwick cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); 1292e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1293fa9e4066Sahrens } 1294fa9e4066Sahrens 1295fa9e4066Sahrens /* 1296fa9e4066Sahrens * ========================================================================== 1297e14bb325SJeff Bonwick * Gang blocks. 1298e14bb325SJeff Bonwick * 1299e14bb325SJeff Bonwick * A gang block is a collection of small blocks that looks to the DMU 1300e14bb325SJeff Bonwick * like one large block. When zio_dva_allocate() cannot find a block 1301e14bb325SJeff Bonwick * of the requested size, due to either severe fragmentation or the pool 1302e14bb325SJeff Bonwick * being nearly full, it calls zio_write_gang_block() to construct the 1303e14bb325SJeff Bonwick * block from smaller fragments. 1304e14bb325SJeff Bonwick * 1305e14bb325SJeff Bonwick * A gang block consists of a gang header (zio_gbh_phys_t) and up to 1306e14bb325SJeff Bonwick * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like 1307e14bb325SJeff Bonwick * an indirect block: it's an array of block pointers. It consumes 1308e14bb325SJeff Bonwick * only one sector and hence is allocatable regardless of fragmentation. 1309e14bb325SJeff Bonwick * The gang header's bps point to its gang members, which hold the data. 1310e14bb325SJeff Bonwick * 1311e14bb325SJeff Bonwick * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> 1312e14bb325SJeff Bonwick * as the verifier to ensure uniqueness of the SHA256 checksum. 1313e14bb325SJeff Bonwick * Critically, the gang block bp's blk_cksum is the checksum of the data, 1314e14bb325SJeff Bonwick * not the gang header. This ensures that data block signatures (needed for 1315e14bb325SJeff Bonwick * deduplication) are independent of how the block is physically stored. 1316e14bb325SJeff Bonwick * 1317e14bb325SJeff Bonwick * Gang blocks can be nested: a gang member may itself be a gang block. 1318e14bb325SJeff Bonwick * Thus every gang block is a tree in which root and all interior nodes are 1319e14bb325SJeff Bonwick * gang headers, and the leaves are normal blocks that contain user data. 1320e14bb325SJeff Bonwick * The root of the gang tree is called the gang leader. 1321e14bb325SJeff Bonwick * 1322e14bb325SJeff Bonwick * To perform any operation (read, rewrite, free, claim) on a gang block, 1323e14bb325SJeff Bonwick * zio_gang_assemble() first assembles the gang tree (minus data leaves) 1324e14bb325SJeff Bonwick * in the io_gang_tree field of the original logical i/o by recursively 1325e14bb325SJeff Bonwick * reading the gang leader and all gang headers below it. This yields 1326e14bb325SJeff Bonwick * an in-core tree containing the contents of every gang header and the 1327e14bb325SJeff Bonwick * bps for every constituent of the gang block. 1328e14bb325SJeff Bonwick * 1329e14bb325SJeff Bonwick * With the gang tree now assembled, zio_gang_issue() just walks the gang tree 1330e14bb325SJeff Bonwick * and invokes a callback on each bp. To free a gang block, zio_gang_issue() 1331e14bb325SJeff Bonwick * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. 1332e14bb325SJeff Bonwick * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). 1333e14bb325SJeff Bonwick * zio_read_gang() is a wrapper around zio_read() that omits reading gang 1334e14bb325SJeff Bonwick * headers, since we already have those in io_gang_tree. zio_rewrite_gang() 1335e14bb325SJeff Bonwick * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() 1336e14bb325SJeff Bonwick * of the gang header plus zio_checksum_compute() of the data to update the 1337e14bb325SJeff Bonwick * gang header's blk_cksum as described above. 1338e14bb325SJeff Bonwick * 1339e14bb325SJeff Bonwick * The two-phase assemble/issue model solves the problem of partial failure -- 1340e14bb325SJeff Bonwick * what if you'd freed part of a gang block but then couldn't read the 1341e14bb325SJeff Bonwick * gang header for another part? Assembling the entire gang tree first 1342e14bb325SJeff Bonwick * ensures that all the necessary gang header I/O has succeeded before 1343e14bb325SJeff Bonwick * starting the actual work of free, claim, or write. Once the gang tree 1344e14bb325SJeff Bonwick * is assembled, free and claim are in-memory operations that cannot fail. 1345e14bb325SJeff Bonwick * 1346e14bb325SJeff Bonwick * In the event that a gang write fails, zio_dva_unallocate() walks the 1347e14bb325SJeff Bonwick * gang tree to immediately free (i.e. insert back into the space map) 1348e14bb325SJeff Bonwick * everything we've allocated. This ensures that we don't get ENOSPC 1349e14bb325SJeff Bonwick * errors during repeated suspend/resume cycles due to a flaky device. 1350e14bb325SJeff Bonwick * 1351e14bb325SJeff Bonwick * Gang rewrites only happen during sync-to-convergence. If we can't assemble 1352e14bb325SJeff Bonwick * the gang tree, we won't modify the block, so we can safely defer the free 1353e14bb325SJeff Bonwick * (knowing that the block is still intact). If we *can* assemble the gang 1354e14bb325SJeff Bonwick * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free 1355e14bb325SJeff Bonwick * each constituent bp and we can allocate a new block on the next sync pass. 1356e14bb325SJeff Bonwick * 1357e14bb325SJeff Bonwick * In all cases, the gang tree allows complete recovery from partial failure. 1358fa9e4066Sahrens * ========================================================================== 1359fa9e4066Sahrens */ 1360e14bb325SJeff Bonwick 1361e14bb325SJeff Bonwick static zio_t * 1362e14bb325SJeff Bonwick zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1363fa9e4066Sahrens { 1364e14bb325SJeff Bonwick if (gn != NULL) 1365e14bb325SJeff Bonwick return (pio); 1366fa9e4066Sahrens 1367e14bb325SJeff Bonwick return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), 1368e14bb325SJeff Bonwick NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1369e14bb325SJeff Bonwick &pio->io_bookmark)); 1370e14bb325SJeff Bonwick } 1371e14bb325SJeff Bonwick 1372e14bb325SJeff Bonwick zio_t * 1373e14bb325SJeff Bonwick zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1374e14bb325SJeff Bonwick { 1375e14bb325SJeff Bonwick zio_t *zio; 1376e14bb325SJeff Bonwick 1377e14bb325SJeff Bonwick if (gn != NULL) { 1378e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1379e14bb325SJeff Bonwick gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, 1380e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1381fa9e4066Sahrens /* 1382e14bb325SJeff Bonwick * As we rewrite each gang header, the pipeline will compute 1383e14bb325SJeff Bonwick * a new gang block header checksum for it; but no one will 1384e14bb325SJeff Bonwick * compute a new data checksum, so we do that here. The one 1385e14bb325SJeff Bonwick * exception is the gang leader: the pipeline already computed 1386e14bb325SJeff Bonwick * its data checksum because that stage precedes gang assembly. 1387e14bb325SJeff Bonwick * (Presently, nothing actually uses interior data checksums; 1388e14bb325SJeff Bonwick * this is just good hygiene.) 1389fa9e4066Sahrens */ 1390f5383399SBill Moore if (gn != pio->io_gang_leader->io_gang_tree) { 1391e14bb325SJeff Bonwick zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), 1392e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp)); 1393e14bb325SJeff Bonwick } 1394*b24ab676SJeff Bonwick /* 1395*b24ab676SJeff Bonwick * If we are here to damage data for testing purposes, 1396*b24ab676SJeff Bonwick * leave the GBH alone so that we can detect the damage. 1397*b24ab676SJeff Bonwick */ 1398*b24ab676SJeff Bonwick if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) 1399*b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 1400fa9e4066Sahrens } else { 1401e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1402e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, 1403e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1404fa9e4066Sahrens } 1405fa9e4066Sahrens 1406e14bb325SJeff Bonwick return (zio); 1407e14bb325SJeff Bonwick } 1408fa9e4066Sahrens 1409e14bb325SJeff Bonwick /* ARGSUSED */ 1410e14bb325SJeff Bonwick zio_t * 1411e14bb325SJeff Bonwick zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1412e14bb325SJeff Bonwick { 1413*b24ab676SJeff Bonwick return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, 1414*b24ab676SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio))); 1415fa9e4066Sahrens } 1416fa9e4066Sahrens 1417e14bb325SJeff Bonwick /* ARGSUSED */ 1418e14bb325SJeff Bonwick zio_t * 1419e14bb325SJeff Bonwick zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1420fa9e4066Sahrens { 1421e14bb325SJeff Bonwick return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, 1422e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 1423e14bb325SJeff Bonwick } 1424fa9e4066Sahrens 1425e14bb325SJeff Bonwick static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { 1426e14bb325SJeff Bonwick NULL, 1427e14bb325SJeff Bonwick zio_read_gang, 1428e14bb325SJeff Bonwick zio_rewrite_gang, 1429e14bb325SJeff Bonwick zio_free_gang, 1430e14bb325SJeff Bonwick zio_claim_gang, 1431e14bb325SJeff Bonwick NULL 1432e14bb325SJeff Bonwick }; 1433fa9e4066Sahrens 1434e14bb325SJeff Bonwick static void zio_gang_tree_assemble_done(zio_t *zio); 1435fa9e4066Sahrens 1436e14bb325SJeff Bonwick static zio_gang_node_t * 1437e14bb325SJeff Bonwick zio_gang_node_alloc(zio_gang_node_t **gnpp) 1438e14bb325SJeff Bonwick { 1439e14bb325SJeff Bonwick zio_gang_node_t *gn; 1440fa9e4066Sahrens 1441e14bb325SJeff Bonwick ASSERT(*gnpp == NULL); 1442fa9e4066Sahrens 1443e14bb325SJeff Bonwick gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); 1444e14bb325SJeff Bonwick gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); 1445e14bb325SJeff Bonwick *gnpp = gn; 1446e14bb325SJeff Bonwick 1447e14bb325SJeff Bonwick return (gn); 1448fa9e4066Sahrens } 1449fa9e4066Sahrens 1450fa9e4066Sahrens static void 1451e14bb325SJeff Bonwick zio_gang_node_free(zio_gang_node_t **gnpp) 1452fa9e4066Sahrens { 1453e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1454fa9e4066Sahrens 1455e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1456e14bb325SJeff Bonwick ASSERT(gn->gn_child[g] == NULL); 1457e14bb325SJeff Bonwick 1458e14bb325SJeff Bonwick zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); 1459e14bb325SJeff Bonwick kmem_free(gn, sizeof (*gn)); 1460e14bb325SJeff Bonwick *gnpp = NULL; 1461fa9e4066Sahrens } 1462fa9e4066Sahrens 1463e14bb325SJeff Bonwick static void 1464e14bb325SJeff Bonwick zio_gang_tree_free(zio_gang_node_t **gnpp) 1465fa9e4066Sahrens { 1466e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1467fa9e4066Sahrens 1468e14bb325SJeff Bonwick if (gn == NULL) 1469e14bb325SJeff Bonwick return; 1470fa9e4066Sahrens 1471e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1472e14bb325SJeff Bonwick zio_gang_tree_free(&gn->gn_child[g]); 1473fa9e4066Sahrens 1474e14bb325SJeff Bonwick zio_gang_node_free(gnpp); 1475fa9e4066Sahrens } 1476fa9e4066Sahrens 1477e14bb325SJeff Bonwick static void 1478f5383399SBill Moore zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) 1479fa9e4066Sahrens { 1480e14bb325SJeff Bonwick zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); 1481e14bb325SJeff Bonwick 1482f5383399SBill Moore ASSERT(gio->io_gang_leader == gio); 1483e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp)); 1484fa9e4066Sahrens 1485f5383399SBill Moore zio_nowait(zio_read(gio, gio->io_spa, bp, gn->gn_gbh, 1486e14bb325SJeff Bonwick SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, 1487f5383399SBill Moore gio->io_priority, ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); 1488e14bb325SJeff Bonwick } 1489fa9e4066Sahrens 1490e14bb325SJeff Bonwick static void 1491e14bb325SJeff Bonwick zio_gang_tree_assemble_done(zio_t *zio) 1492e14bb325SJeff Bonwick { 1493f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 1494e14bb325SJeff Bonwick zio_gang_node_t *gn = zio->io_private; 1495e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1496fa9e4066Sahrens 1497f5383399SBill Moore ASSERT(gio == zio_unique_parent(zio)); 1498*b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 1499fa9e4066Sahrens 1500e14bb325SJeff Bonwick if (zio->io_error) 1501e14bb325SJeff Bonwick return; 1502fa9e4066Sahrens 1503e14bb325SJeff Bonwick if (BP_SHOULD_BYTESWAP(bp)) 1504e14bb325SJeff Bonwick byteswap_uint64_array(zio->io_data, zio->io_size); 1505fa9e4066Sahrens 1506e14bb325SJeff Bonwick ASSERT(zio->io_data == gn->gn_gbh); 1507e14bb325SJeff Bonwick ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); 1508e14bb325SJeff Bonwick ASSERT(gn->gn_gbh->zg_tail.zbt_magic == ZBT_MAGIC); 1509e05725b1Sbonwick 1510e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1511e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1512e14bb325SJeff Bonwick if (!BP_IS_GANG(gbp)) 1513e14bb325SJeff Bonwick continue; 1514f5383399SBill Moore zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); 1515e14bb325SJeff Bonwick } 1516fa9e4066Sahrens } 1517fa9e4066Sahrens 1518e14bb325SJeff Bonwick static void 1519e14bb325SJeff Bonwick zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) 1520fa9e4066Sahrens { 1521f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1522e14bb325SJeff Bonwick zio_t *zio; 1523fa9e4066Sahrens 1524e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) == !!gn); 1525f5383399SBill Moore ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); 1526f5383399SBill Moore ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); 1527fa9e4066Sahrens 1528e14bb325SJeff Bonwick /* 1529e14bb325SJeff Bonwick * If you're a gang header, your data is in gn->gn_gbh. 1530e14bb325SJeff Bonwick * If you're a gang member, your data is in 'data' and gn == NULL. 1531e14bb325SJeff Bonwick */ 1532f5383399SBill Moore zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data); 1533fa9e4066Sahrens 1534e14bb325SJeff Bonwick if (gn != NULL) { 1535e14bb325SJeff Bonwick ASSERT(gn->gn_gbh->zg_tail.zbt_magic == ZBT_MAGIC); 1536fa9e4066Sahrens 1537e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1538e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1539e14bb325SJeff Bonwick if (BP_IS_HOLE(gbp)) 1540e14bb325SJeff Bonwick continue; 1541e14bb325SJeff Bonwick zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); 1542e14bb325SJeff Bonwick data = (char *)data + BP_GET_PSIZE(gbp); 1543e14bb325SJeff Bonwick } 1544fa9e4066Sahrens } 1545fa9e4066Sahrens 1546f5383399SBill Moore if (gn == gio->io_gang_tree) 1547f5383399SBill Moore ASSERT3P((char *)gio->io_data + gio->io_size, ==, data); 1548e05725b1Sbonwick 1549e14bb325SJeff Bonwick if (zio != pio) 1550e14bb325SJeff Bonwick zio_nowait(zio); 1551fa9e4066Sahrens } 1552fa9e4066Sahrens 1553e05725b1Sbonwick static int 1554e14bb325SJeff Bonwick zio_gang_assemble(zio_t *zio) 1555fa9e4066Sahrens { 1556e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1557fa9e4066Sahrens 1558f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); 1559f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1560f5383399SBill Moore 1561f5383399SBill Moore zio->io_gang_leader = zio; 1562fa9e4066Sahrens 1563e14bb325SJeff Bonwick zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); 1564e05725b1Sbonwick 1565e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1566fa9e4066Sahrens } 1567fa9e4066Sahrens 1568e05725b1Sbonwick static int 1569e14bb325SJeff Bonwick zio_gang_issue(zio_t *zio) 1570fa9e4066Sahrens { 1571e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1572fa9e4066Sahrens 1573e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) 1574e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1575fa9e4066Sahrens 1576f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); 1577f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1578fa9e4066Sahrens 1579e14bb325SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_GANG] == 0) 1580f5383399SBill Moore zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_data); 1581e14bb325SJeff Bonwick else 1582f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 1583fa9e4066Sahrens 1584e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1585e05725b1Sbonwick 1586e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1587fa9e4066Sahrens } 1588fa9e4066Sahrens 1589fa9e4066Sahrens static void 1590e14bb325SJeff Bonwick zio_write_gang_member_ready(zio_t *zio) 1591fa9e4066Sahrens { 1592a3f829aeSBill Moore zio_t *pio = zio_unique_parent(zio); 1593f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 159444cd46caSbillm dva_t *cdva = zio->io_bp->blk_dva; 159544cd46caSbillm dva_t *pdva = pio->io_bp->blk_dva; 1596fa9e4066Sahrens uint64_t asize; 1597fa9e4066Sahrens 1598e14bb325SJeff Bonwick if (BP_IS_HOLE(zio->io_bp)) 1599e14bb325SJeff Bonwick return; 1600e14bb325SJeff Bonwick 1601e14bb325SJeff Bonwick ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); 1602e14bb325SJeff Bonwick 1603e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_GANG); 1604*b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); 1605*b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); 1606*b24ab676SJeff Bonwick ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); 160744cd46caSbillm ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); 1608fa9e4066Sahrens 1609fa9e4066Sahrens mutex_enter(&pio->io_lock); 1610e14bb325SJeff Bonwick for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { 161144cd46caSbillm ASSERT(DVA_GET_GANG(&pdva[d])); 161244cd46caSbillm asize = DVA_GET_ASIZE(&pdva[d]); 161344cd46caSbillm asize += DVA_GET_ASIZE(&cdva[d]); 161444cd46caSbillm DVA_SET_ASIZE(&pdva[d], asize); 161544cd46caSbillm } 1616fa9e4066Sahrens mutex_exit(&pio->io_lock); 1617fa9e4066Sahrens } 1618fa9e4066Sahrens 16190a4e9518Sgw static int 1620e14bb325SJeff Bonwick zio_write_gang_block(zio_t *pio) 1621fa9e4066Sahrens { 1622e14bb325SJeff Bonwick spa_t *spa = pio->io_spa; 1623e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 1624f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1625e14bb325SJeff Bonwick zio_t *zio; 1626e14bb325SJeff Bonwick zio_gang_node_t *gn, **gnpp; 1627fa9e4066Sahrens zio_gbh_phys_t *gbh; 1628e14bb325SJeff Bonwick uint64_t txg = pio->io_txg; 1629e14bb325SJeff Bonwick uint64_t resid = pio->io_size; 1630e14bb325SJeff Bonwick uint64_t lsize; 1631*b24ab676SJeff Bonwick int copies = gio->io_prop.zp_copies; 1632*b24ab676SJeff Bonwick int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); 1633e14bb325SJeff Bonwick zio_prop_t zp; 1634fa9e4066Sahrens int error; 1635fa9e4066Sahrens 1636*b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), SPA_GANGBLOCKSIZE, 1637*b24ab676SJeff Bonwick bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, 1638e14bb325SJeff Bonwick METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); 1639e05725b1Sbonwick if (error) { 1640e14bb325SJeff Bonwick pio->io_error = error; 1641e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1642e05725b1Sbonwick } 1643fa9e4066Sahrens 1644f5383399SBill Moore if (pio == gio) { 1645f5383399SBill Moore gnpp = &gio->io_gang_tree; 1646e14bb325SJeff Bonwick } else { 1647e14bb325SJeff Bonwick gnpp = pio->io_private; 1648e14bb325SJeff Bonwick ASSERT(pio->io_ready == zio_write_gang_member_ready); 1649fa9e4066Sahrens } 1650fa9e4066Sahrens 1651e14bb325SJeff Bonwick gn = zio_gang_node_alloc(gnpp); 1652e14bb325SJeff Bonwick gbh = gn->gn_gbh; 1653e14bb325SJeff Bonwick bzero(gbh, SPA_GANGBLOCKSIZE); 1654fa9e4066Sahrens 1655e14bb325SJeff Bonwick /* 1656e14bb325SJeff Bonwick * Create the gang header. 1657e14bb325SJeff Bonwick */ 1658e14bb325SJeff Bonwick zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, 1659e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1660fa9e4066Sahrens 1661e14bb325SJeff Bonwick /* 1662e14bb325SJeff Bonwick * Create and nowait the gang children. 1663e14bb325SJeff Bonwick */ 1664e14bb325SJeff Bonwick for (int g = 0; resid != 0; resid -= lsize, g++) { 1665e14bb325SJeff Bonwick lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), 1666e14bb325SJeff Bonwick SPA_MINBLOCKSIZE); 1667e14bb325SJeff Bonwick ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); 1668e14bb325SJeff Bonwick 1669f5383399SBill Moore zp.zp_checksum = gio->io_prop.zp_checksum; 1670e14bb325SJeff Bonwick zp.zp_compress = ZIO_COMPRESS_OFF; 1671e14bb325SJeff Bonwick zp.zp_type = DMU_OT_NONE; 1672e14bb325SJeff Bonwick zp.zp_level = 0; 1673*b24ab676SJeff Bonwick zp.zp_copies = gio->io_prop.zp_copies; 1674*b24ab676SJeff Bonwick zp.zp_dedup = 0; 1675*b24ab676SJeff Bonwick zp.zp_dedup_verify = 0; 1676e14bb325SJeff Bonwick 1677e14bb325SJeff Bonwick zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], 1678e14bb325SJeff Bonwick (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, 1679e14bb325SJeff Bonwick zio_write_gang_member_ready, NULL, &gn->gn_child[g], 1680e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1681e14bb325SJeff Bonwick &pio->io_bookmark)); 1682e14bb325SJeff Bonwick } 1683e05725b1Sbonwick 168444cd46caSbillm /* 1685e14bb325SJeff Bonwick * Set pio's pipeline to just wait for zio to finish. 168644cd46caSbillm */ 1687e14bb325SJeff Bonwick pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1688e14bb325SJeff Bonwick 1689e14bb325SJeff Bonwick zio_nowait(zio); 1690e14bb325SJeff Bonwick 1691e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1692fa9e4066Sahrens } 1693fa9e4066Sahrens 1694fa9e4066Sahrens /* 1695fa9e4066Sahrens * ========================================================================== 1696*b24ab676SJeff Bonwick * Dedup 1697fa9e4066Sahrens * ========================================================================== 1698fa9e4066Sahrens */ 1699*b24ab676SJeff Bonwick static void 1700*b24ab676SJeff Bonwick zio_ddt_child_read_done(zio_t *zio) 1701*b24ab676SJeff Bonwick { 1702*b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1703*b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1704*b24ab676SJeff Bonwick ddt_phys_t *ddp; 1705*b24ab676SJeff Bonwick zio_t *pio = zio_unique_parent(zio); 1706*b24ab676SJeff Bonwick 1707*b24ab676SJeff Bonwick mutex_enter(&pio->io_lock); 1708*b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 1709*b24ab676SJeff Bonwick if (zio->io_error == 0) 1710*b24ab676SJeff Bonwick ddt_phys_clear(ddp); /* this ddp doesn't need repair */ 1711*b24ab676SJeff Bonwick if (zio->io_error == 0 && dde->dde_repair_data == NULL) 1712*b24ab676SJeff Bonwick dde->dde_repair_data = zio->io_data; 1713*b24ab676SJeff Bonwick else 1714*b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zio->io_size); 1715*b24ab676SJeff Bonwick mutex_exit(&pio->io_lock); 1716*b24ab676SJeff Bonwick } 1717*b24ab676SJeff Bonwick 1718*b24ab676SJeff Bonwick static int 1719*b24ab676SJeff Bonwick zio_ddt_read_start(zio_t *zio) 1720*b24ab676SJeff Bonwick { 1721*b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1722*b24ab676SJeff Bonwick 1723*b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1724*b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1725*b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1726*b24ab676SJeff Bonwick 1727*b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1728*b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1729*b24ab676SJeff Bonwick ddt_entry_t *dde = ddt_repair_start(ddt, bp); 1730*b24ab676SJeff Bonwick ddt_phys_t *ddp = dde->dde_phys; 1731*b24ab676SJeff Bonwick ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); 1732*b24ab676SJeff Bonwick blkptr_t blk; 1733*b24ab676SJeff Bonwick 1734*b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1735*b24ab676SJeff Bonwick zio->io_vsd = dde; 1736*b24ab676SJeff Bonwick 1737*b24ab676SJeff Bonwick if (ddp_self == NULL) 1738*b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1739*b24ab676SJeff Bonwick 1740*b24ab676SJeff Bonwick for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { 1741*b24ab676SJeff Bonwick if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) 1742*b24ab676SJeff Bonwick continue; 1743*b24ab676SJeff Bonwick ddt_bp_create(ddt, &dde->dde_key, ddp, &blk); 1744*b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, &blk, 1745*b24ab676SJeff Bonwick zio_buf_alloc(zio->io_size), zio->io_size, 1746*b24ab676SJeff Bonwick zio_ddt_child_read_done, dde, zio->io_priority, 1747*b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio) | ZIO_FLAG_DONT_PROPAGATE, 1748*b24ab676SJeff Bonwick &zio->io_bookmark)); 1749*b24ab676SJeff Bonwick } 1750*b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1751*b24ab676SJeff Bonwick } 1752*b24ab676SJeff Bonwick 1753*b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, bp, 1754*b24ab676SJeff Bonwick zio->io_data, zio->io_size, NULL, NULL, zio->io_priority, 1755*b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); 1756*b24ab676SJeff Bonwick 1757*b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1758*b24ab676SJeff Bonwick } 1759e14bb325SJeff Bonwick 1760*b24ab676SJeff Bonwick static int 1761*b24ab676SJeff Bonwick zio_ddt_read_done(zio_t *zio) 1762*b24ab676SJeff Bonwick { 1763*b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1764*b24ab676SJeff Bonwick 1765*b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE)) 1766*b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 1767*b24ab676SJeff Bonwick 1768*b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1769*b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1770*b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1771*b24ab676SJeff Bonwick 1772*b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1773*b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1774*b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_vsd; 1775*b24ab676SJeff Bonwick if (ddt == NULL) { 1776*b24ab676SJeff Bonwick ASSERT(zio->io_spa->spa_load_state != SPA_LOAD_NONE); 1777*b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1778*b24ab676SJeff Bonwick } 1779*b24ab676SJeff Bonwick if (dde == NULL) { 1780*b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; 1781*b24ab676SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 1782*b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 1783*b24ab676SJeff Bonwick } 1784*b24ab676SJeff Bonwick if (dde->dde_repair_data != NULL) { 1785*b24ab676SJeff Bonwick bcopy(dde->dde_repair_data, zio->io_data, zio->io_size); 1786*b24ab676SJeff Bonwick zio->io_child_error[ZIO_CHILD_DDT] = 0; 1787*b24ab676SJeff Bonwick } 1788*b24ab676SJeff Bonwick ddt_repair_done(ddt, dde); 1789*b24ab676SJeff Bonwick zio->io_vsd = NULL; 1790*b24ab676SJeff Bonwick } 1791*b24ab676SJeff Bonwick 1792*b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1793*b24ab676SJeff Bonwick 1794*b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1795*b24ab676SJeff Bonwick } 1796*b24ab676SJeff Bonwick 1797*b24ab676SJeff Bonwick static boolean_t 1798*b24ab676SJeff Bonwick zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) 1799*b24ab676SJeff Bonwick { 1800*b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 1801*b24ab676SJeff Bonwick 1802*b24ab676SJeff Bonwick /* 1803*b24ab676SJeff Bonwick * Note: we compare the original data, not the transformed data, 1804*b24ab676SJeff Bonwick * because when zio->io_bp is an override bp, we will not have 1805*b24ab676SJeff Bonwick * pushed the I/O transforms. That's an important optimization 1806*b24ab676SJeff Bonwick * because otherwise we'd compress/encrypt all dmu_sync() data twice. 1807*b24ab676SJeff Bonwick */ 1808*b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 1809*b24ab676SJeff Bonwick zio_t *lio = dde->dde_lead_zio[p]; 1810*b24ab676SJeff Bonwick 1811*b24ab676SJeff Bonwick if (lio != NULL) { 1812*b24ab676SJeff Bonwick return (lio->io_orig_size != zio->io_orig_size || 1813*b24ab676SJeff Bonwick bcmp(zio->io_orig_data, lio->io_orig_data, 1814*b24ab676SJeff Bonwick zio->io_orig_size) != 0); 1815*b24ab676SJeff Bonwick } 1816*b24ab676SJeff Bonwick } 1817*b24ab676SJeff Bonwick 1818*b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 1819*b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1820*b24ab676SJeff Bonwick 1821*b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) { 1822*b24ab676SJeff Bonwick arc_buf_t *abuf = NULL; 1823*b24ab676SJeff Bonwick uint32_t aflags = ARC_WAIT; 1824*b24ab676SJeff Bonwick blkptr_t blk = *zio->io_bp; 1825*b24ab676SJeff Bonwick int error; 1826*b24ab676SJeff Bonwick 1827*b24ab676SJeff Bonwick ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); 1828*b24ab676SJeff Bonwick 1829*b24ab676SJeff Bonwick ddt_exit(ddt); 1830*b24ab676SJeff Bonwick 1831*b24ab676SJeff Bonwick error = arc_read_nolock(NULL, spa, &blk, 1832*b24ab676SJeff Bonwick arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, 1833*b24ab676SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 1834*b24ab676SJeff Bonwick &aflags, &zio->io_bookmark); 1835*b24ab676SJeff Bonwick 1836*b24ab676SJeff Bonwick if (error == 0) { 1837*b24ab676SJeff Bonwick if (arc_buf_size(abuf) != zio->io_orig_size || 1838*b24ab676SJeff Bonwick bcmp(abuf->b_data, zio->io_orig_data, 1839*b24ab676SJeff Bonwick zio->io_orig_size) != 0) 1840*b24ab676SJeff Bonwick error = EEXIST; 1841*b24ab676SJeff Bonwick VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 1842*b24ab676SJeff Bonwick } 1843*b24ab676SJeff Bonwick 1844*b24ab676SJeff Bonwick ddt_enter(ddt); 1845*b24ab676SJeff Bonwick return (error != 0); 1846*b24ab676SJeff Bonwick } 1847*b24ab676SJeff Bonwick } 1848*b24ab676SJeff Bonwick 1849*b24ab676SJeff Bonwick return (B_FALSE); 1850*b24ab676SJeff Bonwick } 1851*b24ab676SJeff Bonwick 1852*b24ab676SJeff Bonwick static void 1853*b24ab676SJeff Bonwick zio_ddt_child_write_ready(zio_t *zio) 1854*b24ab676SJeff Bonwick { 1855*b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 1856*b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 1857*b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1858*b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1859*b24ab676SJeff Bonwick zio_t *pio; 1860*b24ab676SJeff Bonwick 1861*b24ab676SJeff Bonwick if (zio->io_error) 1862*b24ab676SJeff Bonwick return; 1863*b24ab676SJeff Bonwick 1864*b24ab676SJeff Bonwick ddt_enter(ddt); 1865*b24ab676SJeff Bonwick 1866*b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1867*b24ab676SJeff Bonwick 1868*b24ab676SJeff Bonwick ddt_phys_fill(ddp, zio->io_bp); 1869*b24ab676SJeff Bonwick 1870*b24ab676SJeff Bonwick while ((pio = zio_walk_parents(zio)) != NULL) 1871*b24ab676SJeff Bonwick ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); 1872*b24ab676SJeff Bonwick 1873*b24ab676SJeff Bonwick ddt_exit(ddt); 1874*b24ab676SJeff Bonwick } 1875*b24ab676SJeff Bonwick 1876*b24ab676SJeff Bonwick static void 1877*b24ab676SJeff Bonwick zio_ddt_child_write_done(zio_t *zio) 1878*b24ab676SJeff Bonwick { 1879*b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 1880*b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 1881*b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1882*b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1883*b24ab676SJeff Bonwick 1884*b24ab676SJeff Bonwick ddt_enter(ddt); 1885*b24ab676SJeff Bonwick 1886*b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 1887*b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1888*b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 1889*b24ab676SJeff Bonwick 1890*b24ab676SJeff Bonwick if (zio->io_error == 0) { 1891*b24ab676SJeff Bonwick while (zio_walk_parents(zio) != NULL) 1892*b24ab676SJeff Bonwick ddt_phys_addref(ddp); 1893*b24ab676SJeff Bonwick } else { 1894*b24ab676SJeff Bonwick ddt_phys_clear(ddp); 1895*b24ab676SJeff Bonwick } 1896*b24ab676SJeff Bonwick 1897*b24ab676SJeff Bonwick ddt_exit(ddt); 1898*b24ab676SJeff Bonwick } 1899*b24ab676SJeff Bonwick 1900*b24ab676SJeff Bonwick static void 1901*b24ab676SJeff Bonwick zio_ddt_ditto_write_done(zio_t *zio) 1902*b24ab676SJeff Bonwick { 1903*b24ab676SJeff Bonwick int p = DDT_PHYS_DITTO; 1904*b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 1905*b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1906*b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1907*b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1908*b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1909*b24ab676SJeff Bonwick ddt_key_t *ddk = &dde->dde_key; 1910*b24ab676SJeff Bonwick 1911*b24ab676SJeff Bonwick ddt_enter(ddt); 1912*b24ab676SJeff Bonwick 1913*b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 1914*b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1915*b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 1916*b24ab676SJeff Bonwick 1917*b24ab676SJeff Bonwick if (zio->io_error == 0) { 1918*b24ab676SJeff Bonwick ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); 1919*b24ab676SJeff Bonwick ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); 1920*b24ab676SJeff Bonwick ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); 1921*b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 1922*b24ab676SJeff Bonwick ddt_phys_free(ddt, ddk, ddp, zio->io_txg); 1923*b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 1924*b24ab676SJeff Bonwick } 1925*b24ab676SJeff Bonwick 1926*b24ab676SJeff Bonwick ddt_exit(ddt); 1927*b24ab676SJeff Bonwick } 1928*b24ab676SJeff Bonwick 1929*b24ab676SJeff Bonwick static int 1930*b24ab676SJeff Bonwick zio_ddt_write(zio_t *zio) 1931*b24ab676SJeff Bonwick { 1932*b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 1933*b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1934*b24ab676SJeff Bonwick uint64_t txg = zio->io_txg; 1935*b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 1936*b24ab676SJeff Bonwick int p = zp->zp_copies; 1937*b24ab676SJeff Bonwick int ditto_copies; 1938*b24ab676SJeff Bonwick zio_t *cio = NULL; 1939*b24ab676SJeff Bonwick zio_t *dio = NULL; 1940*b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 1941*b24ab676SJeff Bonwick ddt_entry_t *dde; 1942*b24ab676SJeff Bonwick ddt_phys_t *ddp; 1943*b24ab676SJeff Bonwick 1944*b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1945*b24ab676SJeff Bonwick ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); 1946*b24ab676SJeff Bonwick ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); 1947*b24ab676SJeff Bonwick 1948*b24ab676SJeff Bonwick ddt_enter(ddt); 1949*b24ab676SJeff Bonwick dde = ddt_lookup(ddt, bp, B_TRUE); 1950*b24ab676SJeff Bonwick ddp = &dde->dde_phys[p]; 1951*b24ab676SJeff Bonwick 1952*b24ab676SJeff Bonwick if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { 1953*b24ab676SJeff Bonwick /* 1954*b24ab676SJeff Bonwick * If we're using a weak checksum, upgrade to a strong checksum 1955*b24ab676SJeff Bonwick * and try again. If we're already using a strong checksum, 1956*b24ab676SJeff Bonwick * we can't resolve it, so just convert to an ordinary write. 1957*b24ab676SJeff Bonwick * (And automatically e-mail a paper to Nature?) 1958*b24ab676SJeff Bonwick */ 1959*b24ab676SJeff Bonwick if (!zio_checksum_table[zp->zp_checksum].ci_dedup) { 1960*b24ab676SJeff Bonwick zp->zp_checksum = spa_dedup_checksum(spa); 1961*b24ab676SJeff Bonwick zio_pop_transforms(zio); 1962*b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 1963*b24ab676SJeff Bonwick BP_ZERO(bp); 1964*b24ab676SJeff Bonwick } else { 1965*b24ab676SJeff Bonwick zp->zp_dedup = 0; 1966*b24ab676SJeff Bonwick } 1967*b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 1968*b24ab676SJeff Bonwick ddt_exit(ddt); 1969*b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1970*b24ab676SJeff Bonwick } 1971*b24ab676SJeff Bonwick 1972*b24ab676SJeff Bonwick ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); 1973*b24ab676SJeff Bonwick ASSERT(ditto_copies < SPA_DVAS_PER_BP); 1974*b24ab676SJeff Bonwick 1975*b24ab676SJeff Bonwick if (ditto_copies > ddt_ditto_copies_present(dde) && 1976*b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { 1977*b24ab676SJeff Bonwick zio_prop_t czp = *zp; 1978*b24ab676SJeff Bonwick 1979*b24ab676SJeff Bonwick czp.zp_copies = ditto_copies; 1980*b24ab676SJeff Bonwick 1981*b24ab676SJeff Bonwick /* 1982*b24ab676SJeff Bonwick * If we arrived here with an override bp, we won't have run 1983*b24ab676SJeff Bonwick * the transform stack, so we won't have the data we need to 1984*b24ab676SJeff Bonwick * generate a child i/o. So, toss the override bp and restart. 1985*b24ab676SJeff Bonwick * This is safe, because using the override bp is just an 1986*b24ab676SJeff Bonwick * optimization; and it's rare, so the cost doesn't matter. 1987*b24ab676SJeff Bonwick */ 1988*b24ab676SJeff Bonwick if (zio->io_bp_override) { 1989*b24ab676SJeff Bonwick zio_pop_transforms(zio); 1990*b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 1991*b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 1992*b24ab676SJeff Bonwick zio->io_bp_override = NULL; 1993*b24ab676SJeff Bonwick BP_ZERO(bp); 1994*b24ab676SJeff Bonwick ddt_exit(ddt); 1995*b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1996*b24ab676SJeff Bonwick } 1997*b24ab676SJeff Bonwick 1998*b24ab676SJeff Bonwick dio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 1999*b24ab676SJeff Bonwick zio->io_orig_size, &czp, NULL, 2000*b24ab676SJeff Bonwick zio_ddt_ditto_write_done, dde, zio->io_priority, 2001*b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2002*b24ab676SJeff Bonwick 2003*b24ab676SJeff Bonwick zio_push_transform(dio, zio->io_data, zio->io_size, 0, NULL); 2004*b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; 2005*b24ab676SJeff Bonwick } 2006*b24ab676SJeff Bonwick 2007*b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { 2008*b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2009*b24ab676SJeff Bonwick ddt_bp_fill(ddp, bp, txg); 2010*b24ab676SJeff Bonwick if (dde->dde_lead_zio[p] != NULL) 2011*b24ab676SJeff Bonwick zio_add_child(zio, dde->dde_lead_zio[p]); 2012*b24ab676SJeff Bonwick else 2013*b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2014*b24ab676SJeff Bonwick } else if (zio->io_bp_override) { 2015*b24ab676SJeff Bonwick ASSERT(bp->blk_birth == txg); 2016*b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, zio->io_bp_override)); 2017*b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2018*b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2019*b24ab676SJeff Bonwick } else { 2020*b24ab676SJeff Bonwick cio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 2021*b24ab676SJeff Bonwick zio->io_orig_size, zp, zio_ddt_child_write_ready, 2022*b24ab676SJeff Bonwick zio_ddt_child_write_done, dde, zio->io_priority, 2023*b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2024*b24ab676SJeff Bonwick 2025*b24ab676SJeff Bonwick zio_push_transform(cio, zio->io_data, zio->io_size, 0, NULL); 2026*b24ab676SJeff Bonwick dde->dde_lead_zio[p] = cio; 2027*b24ab676SJeff Bonwick } 2028*b24ab676SJeff Bonwick 2029*b24ab676SJeff Bonwick ddt_exit(ddt); 2030*b24ab676SJeff Bonwick 2031*b24ab676SJeff Bonwick if (cio) 2032*b24ab676SJeff Bonwick zio_nowait(cio); 2033*b24ab676SJeff Bonwick if (dio) 2034*b24ab676SJeff Bonwick zio_nowait(dio); 2035*b24ab676SJeff Bonwick 2036*b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2037*b24ab676SJeff Bonwick } 2038*b24ab676SJeff Bonwick 2039*b24ab676SJeff Bonwick static int 2040*b24ab676SJeff Bonwick zio_ddt_free(zio_t *zio) 2041*b24ab676SJeff Bonwick { 2042*b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2043*b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2044*b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2045*b24ab676SJeff Bonwick ddt_entry_t *dde; 2046*b24ab676SJeff Bonwick ddt_phys_t *ddp; 2047*b24ab676SJeff Bonwick 2048*b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2049*b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2050*b24ab676SJeff Bonwick 2051*b24ab676SJeff Bonwick ddt_enter(ddt); 2052*b24ab676SJeff Bonwick dde = ddt_lookup(ddt, bp, B_TRUE); 2053*b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 2054*b24ab676SJeff Bonwick ddt_phys_decref(ddp); 2055*b24ab676SJeff Bonwick ddt_exit(ddt); 2056*b24ab676SJeff Bonwick 2057*b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2058*b24ab676SJeff Bonwick } 2059*b24ab676SJeff Bonwick 2060*b24ab676SJeff Bonwick /* 2061*b24ab676SJeff Bonwick * ========================================================================== 2062*b24ab676SJeff Bonwick * Allocate and free blocks 2063*b24ab676SJeff Bonwick * ========================================================================== 2064*b24ab676SJeff Bonwick */ 2065e05725b1Sbonwick static int 2066fa9e4066Sahrens zio_dva_allocate(zio_t *zio) 2067fa9e4066Sahrens { 20688654d025Sperrin spa_t *spa = zio->io_spa; 2069*b24ab676SJeff Bonwick metaslab_class_t *mc = spa_normal_class(spa); 2070fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2071fa9e4066Sahrens int error; 2072fa9e4066Sahrens 2073f5383399SBill Moore if (zio->io_gang_leader == NULL) { 2074f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 2075f5383399SBill Moore zio->io_gang_leader = zio; 2076f5383399SBill Moore } 2077f5383399SBill Moore 2078fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 207944cd46caSbillm ASSERT3U(BP_GET_NDVAS(bp), ==, 0); 2080*b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, >, 0); 2081*b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); 2082fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 2083fa9e4066Sahrens 2084e14bb325SJeff Bonwick error = metaslab_alloc(spa, mc, zio->io_size, bp, 2085*b24ab676SJeff Bonwick zio->io_prop.zp_copies, zio->io_txg, NULL, 0); 2086fa9e4066Sahrens 2087e14bb325SJeff Bonwick if (error) { 2088e14bb325SJeff Bonwick if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) 2089e14bb325SJeff Bonwick return (zio_write_gang_block(zio)); 2090fa9e4066Sahrens zio->io_error = error; 2091fa9e4066Sahrens } 2092e05725b1Sbonwick 2093e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2094fa9e4066Sahrens } 2095fa9e4066Sahrens 2096e05725b1Sbonwick static int 2097fa9e4066Sahrens zio_dva_free(zio_t *zio) 2098fa9e4066Sahrens { 2099e14bb325SJeff Bonwick metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); 2100fa9e4066Sahrens 2101e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2102fa9e4066Sahrens } 2103fa9e4066Sahrens 2104e05725b1Sbonwick static int 2105fa9e4066Sahrens zio_dva_claim(zio_t *zio) 2106fa9e4066Sahrens { 2107e14bb325SJeff Bonwick int error; 2108e14bb325SJeff Bonwick 2109e14bb325SJeff Bonwick error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); 2110e14bb325SJeff Bonwick if (error) 2111e14bb325SJeff Bonwick zio->io_error = error; 2112fa9e4066Sahrens 2113e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2114fa9e4066Sahrens } 2115fa9e4066Sahrens 2116e14bb325SJeff Bonwick /* 2117e14bb325SJeff Bonwick * Undo an allocation. This is used by zio_done() when an I/O fails 2118e14bb325SJeff Bonwick * and we want to give back the block we just allocated. 2119e14bb325SJeff Bonwick * This handles both normal blocks and gang blocks. 2120e14bb325SJeff Bonwick */ 2121e14bb325SJeff Bonwick static void 2122e14bb325SJeff Bonwick zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) 2123e14bb325SJeff Bonwick { 2124e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2125*b24ab676SJeff Bonwick ASSERT(zio->io_bp_override == NULL); 2126e14bb325SJeff Bonwick 2127e14bb325SJeff Bonwick if (!BP_IS_HOLE(bp)) 2128*b24ab676SJeff Bonwick metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); 2129e14bb325SJeff Bonwick 2130e14bb325SJeff Bonwick if (gn != NULL) { 2131e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 2132e14bb325SJeff Bonwick zio_dva_unallocate(zio, gn->gn_child[g], 2133e14bb325SJeff Bonwick &gn->gn_gbh->zg_blkptr[g]); 2134e14bb325SJeff Bonwick } 2135e14bb325SJeff Bonwick } 2136e14bb325SJeff Bonwick } 2137e14bb325SJeff Bonwick 2138e14bb325SJeff Bonwick /* 2139e14bb325SJeff Bonwick * Try to allocate an intent log block. Return 0 on success, errno on failure. 2140e14bb325SJeff Bonwick */ 2141e14bb325SJeff Bonwick int 2142*b24ab676SJeff Bonwick zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, blkptr_t *old_bp, 2143*b24ab676SJeff Bonwick uint64_t size, boolean_t use_slog) 2144e14bb325SJeff Bonwick { 2145e09fa4daSNeil Perrin int error = 1; 2146e14bb325SJeff Bonwick 2147*b24ab676SJeff Bonwick ASSERT(txg > spa_syncing_txg(spa)); 2148*b24ab676SJeff Bonwick 2149d48e086fSNeil Perrin if (use_slog) 2150*b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_log_class(spa), size, 2151e09fa4daSNeil Perrin new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); 2152e14bb325SJeff Bonwick 2153e14bb325SJeff Bonwick if (error) 2154*b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), size, 2155e14bb325SJeff Bonwick new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); 2156e14bb325SJeff Bonwick 2157e14bb325SJeff Bonwick if (error == 0) { 2158e14bb325SJeff Bonwick BP_SET_LSIZE(new_bp, size); 2159e14bb325SJeff Bonwick BP_SET_PSIZE(new_bp, size); 2160e14bb325SJeff Bonwick BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); 2161e14bb325SJeff Bonwick BP_SET_CHECKSUM(new_bp, ZIO_CHECKSUM_ZILOG); 2162e14bb325SJeff Bonwick BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 2163e14bb325SJeff Bonwick BP_SET_LEVEL(new_bp, 0); 2164*b24ab676SJeff Bonwick BP_SET_DEDUP(new_bp, 0); 2165e14bb325SJeff Bonwick BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); 2166e14bb325SJeff Bonwick } 2167e14bb325SJeff Bonwick 2168e14bb325SJeff Bonwick return (error); 2169e14bb325SJeff Bonwick } 2170e14bb325SJeff Bonwick 2171e14bb325SJeff Bonwick /* 2172*b24ab676SJeff Bonwick * Free an intent log block. 2173e14bb325SJeff Bonwick */ 2174e14bb325SJeff Bonwick void 2175*b24ab676SJeff Bonwick zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp) 2176e14bb325SJeff Bonwick { 2177*b24ab676SJeff Bonwick ASSERT(BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG); 2178e14bb325SJeff Bonwick ASSERT(!BP_IS_GANG(bp)); 2179e14bb325SJeff Bonwick 2180*b24ab676SJeff Bonwick zio_free(spa, txg, bp); 2181e14bb325SJeff Bonwick } 2182e14bb325SJeff Bonwick 2183fa9e4066Sahrens /* 2184fa9e4066Sahrens * ========================================================================== 2185fa9e4066Sahrens * Read and write to physical devices 2186fa9e4066Sahrens * ========================================================================== 2187fa9e4066Sahrens */ 2188e05725b1Sbonwick static int 218944cd46caSbillm zio_vdev_io_start(zio_t *zio) 2190fa9e4066Sahrens { 2191fa9e4066Sahrens vdev_t *vd = zio->io_vd; 219244cd46caSbillm uint64_t align; 21930a4e9518Sgw spa_t *spa = zio->io_spa; 21940a4e9518Sgw 2195e14bb325SJeff Bonwick ASSERT(zio->io_error == 0); 2196e14bb325SJeff Bonwick ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); 2197fa9e4066Sahrens 2198e14bb325SJeff Bonwick if (vd == NULL) { 2199e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2200e14bb325SJeff Bonwick spa_config_enter(spa, SCL_ZIO, zio, RW_READER); 2201fa9e4066Sahrens 2202e14bb325SJeff Bonwick /* 2203e14bb325SJeff Bonwick * The mirror_ops handle multiple DVAs in a single BP. 2204e14bb325SJeff Bonwick */ 2205e14bb325SJeff Bonwick return (vdev_mirror_ops.vdev_op_io_start(zio)); 2206fa9e4066Sahrens } 2207fa9e4066Sahrens 2208e14bb325SJeff Bonwick align = 1ULL << vd->vdev_top->vdev_ashift; 2209e14bb325SJeff Bonwick 2210ecc2d604Sbonwick if (P2PHASE(zio->io_size, align) != 0) { 2211ecc2d604Sbonwick uint64_t asize = P2ROUNDUP(zio->io_size, align); 2212ecc2d604Sbonwick char *abuf = zio_buf_alloc(asize); 2213e14bb325SJeff Bonwick ASSERT(vd == vd->vdev_top); 2214ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_WRITE) { 2215ecc2d604Sbonwick bcopy(zio->io_data, abuf, zio->io_size); 2216ecc2d604Sbonwick bzero(abuf + zio->io_size, asize - zio->io_size); 2217ecc2d604Sbonwick } 2218e14bb325SJeff Bonwick zio_push_transform(zio, abuf, asize, asize, zio_subblock); 2219ecc2d604Sbonwick } 2220ecc2d604Sbonwick 2221ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_offset, align) == 0); 2222ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_size, align) == 0); 22238ad4d6ddSJeff Bonwick ASSERT(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); 22248ad4d6ddSJeff Bonwick 22258ad4d6ddSJeff Bonwick /* 22268ad4d6ddSJeff Bonwick * If this is a repair I/O, and there's no self-healing involved -- 22278ad4d6ddSJeff Bonwick * that is, we're just resilvering what we expect to resilver -- 22288ad4d6ddSJeff Bonwick * then don't do the I/O unless zio's txg is actually in vd's DTL. 22298ad4d6ddSJeff Bonwick * This prevents spurious resilvering with nested replication. 22308ad4d6ddSJeff Bonwick * For example, given a mirror of mirrors, (A+B)+(C+D), if only 22318ad4d6ddSJeff Bonwick * A is out of date, we'll read from C+D, then use the data to 22328ad4d6ddSJeff Bonwick * resilver A+B -- but we don't actually want to resilver B, just A. 22338ad4d6ddSJeff Bonwick * The top-level mirror has no way to know this, so instead we just 22348ad4d6ddSJeff Bonwick * discard unnecessary repairs as we work our way down the vdev tree. 22358ad4d6ddSJeff Bonwick * The same logic applies to any form of nested replication: 22368ad4d6ddSJeff Bonwick * ditto + mirror, RAID-Z + replacing, etc. This covers them all. 22378ad4d6ddSJeff Bonwick */ 22388ad4d6ddSJeff Bonwick if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && 22398ad4d6ddSJeff Bonwick !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && 22408ad4d6ddSJeff Bonwick zio->io_txg != 0 && /* not a delegated i/o */ 22418ad4d6ddSJeff Bonwick !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { 22428ad4d6ddSJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 22438ad4d6ddSJeff Bonwick zio_vdev_io_bypass(zio); 22448ad4d6ddSJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 22458ad4d6ddSJeff Bonwick } 2246fa9e4066Sahrens 2247e14bb325SJeff Bonwick if (vd->vdev_ops->vdev_op_leaf && 2248e14bb325SJeff Bonwick (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { 2249e14bb325SJeff Bonwick 2250e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) 2251a3f829aeSBill Moore return (ZIO_PIPELINE_CONTINUE); 2252e14bb325SJeff Bonwick 2253e14bb325SJeff Bonwick if ((zio = vdev_queue_io(zio)) == NULL) 2254e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2255e14bb325SJeff Bonwick 2256e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2257e14bb325SJeff Bonwick zio->io_error = ENXIO; 2258e14bb325SJeff Bonwick zio_interrupt(zio); 2259e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2260e14bb325SJeff Bonwick } 2261e14bb325SJeff Bonwick } 2262e14bb325SJeff Bonwick 2263e05725b1Sbonwick return (vd->vdev_ops->vdev_op_io_start(zio)); 2264fa9e4066Sahrens } 2265fa9e4066Sahrens 2266e05725b1Sbonwick static int 2267fa9e4066Sahrens zio_vdev_io_done(zio_t *zio) 2268fa9e4066Sahrens { 2269e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2270e14bb325SJeff Bonwick vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; 2271e14bb325SJeff Bonwick boolean_t unexpected_error = B_FALSE; 2272e05725b1Sbonwick 2273e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2274e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2275fa9e4066Sahrens 2276e14bb325SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); 2277e14bb325SJeff Bonwick 2278e14bb325SJeff Bonwick if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { 2279e14bb325SJeff Bonwick 2280e14bb325SJeff Bonwick vdev_queue_io_done(zio); 2281fa9e4066Sahrens 2282e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE) 2283e14bb325SJeff Bonwick vdev_cache_write(zio); 2284e14bb325SJeff Bonwick 2285e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 22868956713aSEric Schrock zio->io_error = zio_handle_device_injection(vd, 22878956713aSEric Schrock zio, EIO); 2288e14bb325SJeff Bonwick 2289e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2290e14bb325SJeff Bonwick zio->io_error = zio_handle_label_injection(zio, EIO); 2291e14bb325SJeff Bonwick 2292e14bb325SJeff Bonwick if (zio->io_error) { 2293e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2294e14bb325SJeff Bonwick zio->io_error = ENXIO; 2295e14bb325SJeff Bonwick } else { 2296e14bb325SJeff Bonwick unexpected_error = B_TRUE; 2297e14bb325SJeff Bonwick } 2298e14bb325SJeff Bonwick } 229951ece835Seschrock } 2300fa9e4066Sahrens 2301e14bb325SJeff Bonwick ops->vdev_op_io_done(zio); 2302e14bb325SJeff Bonwick 2303e14bb325SJeff Bonwick if (unexpected_error) 2304a3f829aeSBill Moore VERIFY(vdev_probe(vd, zio) == NULL); 2305e14bb325SJeff Bonwick 2306e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2307fa9e4066Sahrens } 2308fa9e4066Sahrens 230922fe2c88SJonathan Adams /* 231022fe2c88SJonathan Adams * For non-raidz ZIOs, we can just copy aside the bad data read from the 231122fe2c88SJonathan Adams * disk, and use that to finish the checksum ereport later. 231222fe2c88SJonathan Adams */ 231322fe2c88SJonathan Adams static void 231422fe2c88SJonathan Adams zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, 231522fe2c88SJonathan Adams const void *good_buf) 231622fe2c88SJonathan Adams { 231722fe2c88SJonathan Adams /* no processing needed */ 231822fe2c88SJonathan Adams zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); 231922fe2c88SJonathan Adams } 232022fe2c88SJonathan Adams 232122fe2c88SJonathan Adams /*ARGSUSED*/ 232222fe2c88SJonathan Adams void 232322fe2c88SJonathan Adams zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) 232422fe2c88SJonathan Adams { 232522fe2c88SJonathan Adams void *buf = zio_buf_alloc(zio->io_size); 232622fe2c88SJonathan Adams 232722fe2c88SJonathan Adams bcopy(zio->io_data, buf, zio->io_size); 232822fe2c88SJonathan Adams 232922fe2c88SJonathan Adams zcr->zcr_cbinfo = zio->io_size; 233022fe2c88SJonathan Adams zcr->zcr_cbdata = buf; 233122fe2c88SJonathan Adams zcr->zcr_finish = zio_vsd_default_cksum_finish; 233222fe2c88SJonathan Adams zcr->zcr_free = zio_buf_free; 233322fe2c88SJonathan Adams } 233422fe2c88SJonathan Adams 2335e05725b1Sbonwick static int 2336fa9e4066Sahrens zio_vdev_io_assess(zio_t *zio) 2337fa9e4066Sahrens { 2338fa9e4066Sahrens vdev_t *vd = zio->io_vd; 2339e14bb325SJeff Bonwick 2340e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2341e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2342e14bb325SJeff Bonwick 2343e14bb325SJeff Bonwick if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2344e14bb325SJeff Bonwick spa_config_exit(zio->io_spa, SCL_ZIO, zio); 2345e14bb325SJeff Bonwick 2346e14bb325SJeff Bonwick if (zio->io_vsd != NULL) { 234722fe2c88SJonathan Adams zio->io_vsd_ops->vsd_free(zio); 2348e14bb325SJeff Bonwick zio->io_vsd = NULL; 2349ecc2d604Sbonwick } 2350ecc2d604Sbonwick 2351e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2352ea8dc4b6Seschrock zio->io_error = zio_handle_fault_injection(zio, EIO); 2353ea8dc4b6Seschrock 2354fa9e4066Sahrens /* 2355fa9e4066Sahrens * If the I/O failed, determine whether we should attempt to retry it. 2356fa9e4066Sahrens */ 2357e14bb325SJeff Bonwick if (zio->io_error && vd == NULL && 2358e14bb325SJeff Bonwick !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { 2359e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ 2360e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ 2361fa9e4066Sahrens zio->io_error = 0; 2362e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_RETRY | 2363e14bb325SJeff Bonwick ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; 2364*b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; 2365e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 2366e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2367ea8dc4b6Seschrock } 2368fa9e4066Sahrens 2369e14bb325SJeff Bonwick /* 2370e14bb325SJeff Bonwick * If we got an error on a leaf device, convert it to ENXIO 2371e14bb325SJeff Bonwick * if the device is not accessible at all. 2372e14bb325SJeff Bonwick */ 2373e14bb325SJeff Bonwick if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && 2374e14bb325SJeff Bonwick !vdev_accessible(vd, zio)) 2375e14bb325SJeff Bonwick zio->io_error = ENXIO; 2376e14bb325SJeff Bonwick 2377e14bb325SJeff Bonwick /* 2378e14bb325SJeff Bonwick * If we can't write to an interior vdev (mirror or RAID-Z), 2379e14bb325SJeff Bonwick * set vdev_cant_write so that we stop trying to allocate from it. 2380e14bb325SJeff Bonwick */ 2381e14bb325SJeff Bonwick if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && 2382e14bb325SJeff Bonwick vd != NULL && !vd->vdev_ops->vdev_op_leaf) 2383e14bb325SJeff Bonwick vd->vdev_cant_write = B_TRUE; 2384e14bb325SJeff Bonwick 2385e14bb325SJeff Bonwick if (zio->io_error) 2386e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2387e14bb325SJeff Bonwick 2388e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2389fa9e4066Sahrens } 2390fa9e4066Sahrens 2391fa9e4066Sahrens void 2392fa9e4066Sahrens zio_vdev_io_reissue(zio_t *zio) 2393fa9e4066Sahrens { 2394fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2395fa9e4066Sahrens ASSERT(zio->io_error == 0); 2396fa9e4066Sahrens 2397*b24ab676SJeff Bonwick zio->io_stage >>= 1; 2398fa9e4066Sahrens } 2399fa9e4066Sahrens 2400fa9e4066Sahrens void 2401fa9e4066Sahrens zio_vdev_io_redone(zio_t *zio) 2402fa9e4066Sahrens { 2403fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); 2404fa9e4066Sahrens 2405*b24ab676SJeff Bonwick zio->io_stage >>= 1; 2406fa9e4066Sahrens } 2407fa9e4066Sahrens 2408fa9e4066Sahrens void 2409fa9e4066Sahrens zio_vdev_io_bypass(zio_t *zio) 2410fa9e4066Sahrens { 2411fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2412fa9e4066Sahrens ASSERT(zio->io_error == 0); 2413fa9e4066Sahrens 2414fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_IO_BYPASS; 2415*b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; 2416fa9e4066Sahrens } 2417fa9e4066Sahrens 2418fa9e4066Sahrens /* 2419fa9e4066Sahrens * ========================================================================== 2420fa9e4066Sahrens * Generate and verify checksums 2421fa9e4066Sahrens * ========================================================================== 2422fa9e4066Sahrens */ 2423e05725b1Sbonwick static int 2424fa9e4066Sahrens zio_checksum_generate(zio_t *zio) 2425fa9e4066Sahrens { 2426fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2427e14bb325SJeff Bonwick enum zio_checksum checksum; 2428fa9e4066Sahrens 2429e14bb325SJeff Bonwick if (bp == NULL) { 2430e14bb325SJeff Bonwick /* 2431e14bb325SJeff Bonwick * This is zio_write_phys(). 2432e14bb325SJeff Bonwick * We're either generating a label checksum, or none at all. 2433e14bb325SJeff Bonwick */ 2434e14bb325SJeff Bonwick checksum = zio->io_prop.zp_checksum; 2435e14bb325SJeff Bonwick 2436e14bb325SJeff Bonwick if (checksum == ZIO_CHECKSUM_OFF) 2437e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2438fa9e4066Sahrens 2439e14bb325SJeff Bonwick ASSERT(checksum == ZIO_CHECKSUM_LABEL); 2440e14bb325SJeff Bonwick } else { 2441e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { 2442e14bb325SJeff Bonwick ASSERT(!IO_IS_ALLOCATING(zio)); 2443e14bb325SJeff Bonwick checksum = ZIO_CHECKSUM_GANG_HEADER; 2444e14bb325SJeff Bonwick } else { 2445e14bb325SJeff Bonwick checksum = BP_GET_CHECKSUM(bp); 2446e14bb325SJeff Bonwick } 2447e14bb325SJeff Bonwick } 2448fa9e4066Sahrens 2449e14bb325SJeff Bonwick zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); 2450fa9e4066Sahrens 2451e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2452fa9e4066Sahrens } 2453fa9e4066Sahrens 2454e05725b1Sbonwick static int 2455e14bb325SJeff Bonwick zio_checksum_verify(zio_t *zio) 2456fa9e4066Sahrens { 245722fe2c88SJonathan Adams zio_bad_cksum_t info; 2458e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2459e14bb325SJeff Bonwick int error; 2460fa9e4066Sahrens 2461*b24ab676SJeff Bonwick ASSERT(zio->io_vd != NULL); 2462*b24ab676SJeff Bonwick 2463e14bb325SJeff Bonwick if (bp == NULL) { 2464e14bb325SJeff Bonwick /* 2465e14bb325SJeff Bonwick * This is zio_read_phys(). 2466e14bb325SJeff Bonwick * We're either verifying a label checksum, or nothing at all. 2467e14bb325SJeff Bonwick */ 2468e14bb325SJeff Bonwick if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) 2469e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2470fa9e4066Sahrens 2471e14bb325SJeff Bonwick ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); 2472e14bb325SJeff Bonwick } 2473fa9e4066Sahrens 247422fe2c88SJonathan Adams if ((error = zio_checksum_error(zio, &info)) != 0) { 2475e14bb325SJeff Bonwick zio->io_error = error; 2476e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { 247722fe2c88SJonathan Adams zfs_ereport_start_checksum(zio->io_spa, 247822fe2c88SJonathan Adams zio->io_vd, zio, zio->io_offset, 247922fe2c88SJonathan Adams zio->io_size, NULL, &info); 2480e14bb325SJeff Bonwick } 2481fa9e4066Sahrens } 2482fa9e4066Sahrens 2483e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2484fa9e4066Sahrens } 2485fa9e4066Sahrens 2486fa9e4066Sahrens /* 2487fa9e4066Sahrens * Called by RAID-Z to ensure we don't compute the checksum twice. 2488fa9e4066Sahrens */ 2489fa9e4066Sahrens void 2490fa9e4066Sahrens zio_checksum_verified(zio_t *zio) 2491fa9e4066Sahrens { 2492*b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 2493fa9e4066Sahrens } 2494fa9e4066Sahrens 2495fa9e4066Sahrens /* 2496e14bb325SJeff Bonwick * ========================================================================== 2497e14bb325SJeff Bonwick * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. 2498e14bb325SJeff Bonwick * An error of 0 indictes success. ENXIO indicates whole-device failure, 2499e14bb325SJeff Bonwick * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO 2500e14bb325SJeff Bonwick * indicate errors that are specific to one I/O, and most likely permanent. 2501e14bb325SJeff Bonwick * Any other error is presumed to be worse because we weren't expecting it. 2502e14bb325SJeff Bonwick * ========================================================================== 2503fa9e4066Sahrens */ 2504e14bb325SJeff Bonwick int 2505e14bb325SJeff Bonwick zio_worst_error(int e1, int e2) 2506fa9e4066Sahrens { 2507e14bb325SJeff Bonwick static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; 2508e14bb325SJeff Bonwick int r1, r2; 2509e14bb325SJeff Bonwick 2510e14bb325SJeff Bonwick for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) 2511e14bb325SJeff Bonwick if (e1 == zio_error_rank[r1]) 2512e14bb325SJeff Bonwick break; 2513e14bb325SJeff Bonwick 2514e14bb325SJeff Bonwick for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) 2515e14bb325SJeff Bonwick if (e2 == zio_error_rank[r2]) 2516e14bb325SJeff Bonwick break; 251744cd46caSbillm 2518e14bb325SJeff Bonwick return (r1 > r2 ? e1 : e2); 2519fa9e4066Sahrens } 2520fa9e4066Sahrens 2521fa9e4066Sahrens /* 2522fa9e4066Sahrens * ========================================================================== 2523e14bb325SJeff Bonwick * I/O completion 2524fa9e4066Sahrens * ========================================================================== 2525fa9e4066Sahrens */ 2526e14bb325SJeff Bonwick static int 2527e14bb325SJeff Bonwick zio_ready(zio_t *zio) 2528fa9e4066Sahrens { 2529e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2530a3f829aeSBill Moore zio_t *pio, *pio_next; 2531fa9e4066Sahrens 2532*b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 2533*b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_READY)) 2534f5383399SBill Moore return (ZIO_PIPELINE_STOP); 2535fa9e4066Sahrens 2536f5383399SBill Moore if (zio->io_ready) { 2537e14bb325SJeff Bonwick ASSERT(IO_IS_ALLOCATING(zio)); 2538e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2539e14bb325SJeff Bonwick ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); 2540fa9e4066Sahrens 2541e14bb325SJeff Bonwick zio->io_ready(zio); 2542e14bb325SJeff Bonwick } 2543fa9e4066Sahrens 2544e14bb325SJeff Bonwick if (bp != NULL && bp != &zio->io_bp_copy) 2545e14bb325SJeff Bonwick zio->io_bp_copy = *bp; 2546fa9e4066Sahrens 2547e14bb325SJeff Bonwick if (zio->io_error) 2548e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2549fa9e4066Sahrens 2550a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2551a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = 1; 2552a3f829aeSBill Moore pio = zio_walk_parents(zio); 2553a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2554a3f829aeSBill Moore 2555a3f829aeSBill Moore /* 2556a3f829aeSBill Moore * As we notify zio's parents, new parents could be added. 2557a3f829aeSBill Moore * New parents go to the head of zio's io_parent_list, however, 2558a3f829aeSBill Moore * so we will (correctly) not notify them. The remainder of zio's 2559a3f829aeSBill Moore * io_parent_list, from 'pio_next' onward, cannot change because 2560a3f829aeSBill Moore * all parents must wait for us to be done before they can be done. 2561a3f829aeSBill Moore */ 2562a3f829aeSBill Moore for (; pio != NULL; pio = pio_next) { 2563a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2564e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_READY); 2565a3f829aeSBill Moore } 2566fa9e4066Sahrens 2567*b24ab676SJeff Bonwick if (zio->io_flags & ZIO_FLAG_NODATA) { 2568*b24ab676SJeff Bonwick if (BP_IS_GANG(bp)) { 2569*b24ab676SJeff Bonwick zio->io_flags &= ~ZIO_FLAG_NODATA; 2570*b24ab676SJeff Bonwick } else { 2571*b24ab676SJeff Bonwick ASSERT((uintptr_t)zio->io_data < SPA_MAXBLOCKSIZE); 2572*b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 2573*b24ab676SJeff Bonwick } 2574*b24ab676SJeff Bonwick } 2575*b24ab676SJeff Bonwick 2576e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2577fa9e4066Sahrens } 2578fa9e4066Sahrens 2579e14bb325SJeff Bonwick static int 2580e14bb325SJeff Bonwick zio_done(zio_t *zio) 2581d63d470bSgw { 2582e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 2583e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 2584e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2585e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2586e14bb325SJeff Bonwick uint64_t psize = zio->io_size; 2587a3f829aeSBill Moore zio_t *pio, *pio_next; 2588d63d470bSgw 2589e14bb325SJeff Bonwick /* 2590f5383399SBill Moore * If our children haven't all completed, 2591e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 2592e14bb325SJeff Bonwick */ 2593e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || 2594e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || 2595*b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE) || 2596e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) 2597e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2598d63d470bSgw 2599e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 2600e14bb325SJeff Bonwick for (int w = 0; w < ZIO_WAIT_TYPES; w++) 2601e14bb325SJeff Bonwick ASSERT(zio->io_children[c][w] == 0); 2602e14bb325SJeff Bonwick 2603e14bb325SJeff Bonwick if (bp != NULL) { 2604e14bb325SJeff Bonwick ASSERT(bp->blk_pad[0] == 0); 2605e14bb325SJeff Bonwick ASSERT(bp->blk_pad[1] == 0); 2606e14bb325SJeff Bonwick ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || 2607a3f829aeSBill Moore (bp == zio_unique_parent(zio)->io_bp)); 2608e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && 2609*b24ab676SJeff Bonwick zio->io_bp_override == NULL && 2610e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { 2611e14bb325SJeff Bonwick ASSERT(!BP_SHOULD_BYTESWAP(bp)); 2612*b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(bp)); 2613e14bb325SJeff Bonwick ASSERT(BP_COUNT_GANG(bp) == 0 || 2614e14bb325SJeff Bonwick (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); 2615e14bb325SJeff Bonwick } 2616e14bb325SJeff Bonwick } 2617fa9e4066Sahrens 2618e14bb325SJeff Bonwick /* 2619*b24ab676SJeff Bonwick * If there were child vdev/gang/ddt errors, they apply to us now. 2620e14bb325SJeff Bonwick */ 2621e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); 2622e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_GANG); 2623*b24ab676SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_DDT); 2624*b24ab676SJeff Bonwick 2625*b24ab676SJeff Bonwick /* 2626*b24ab676SJeff Bonwick * If the I/O on the transformed data was successful, generate any 2627*b24ab676SJeff Bonwick * checksum reports now while we still have the transformed data. 2628*b24ab676SJeff Bonwick */ 2629*b24ab676SJeff Bonwick if (zio->io_error == 0) { 2630*b24ab676SJeff Bonwick while (zio->io_cksum_report != NULL) { 2631*b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 2632*b24ab676SJeff Bonwick uint64_t align = zcr->zcr_align; 2633*b24ab676SJeff Bonwick uint64_t asize = P2ROUNDUP(psize, align); 2634*b24ab676SJeff Bonwick char *abuf = zio->io_data; 2635*b24ab676SJeff Bonwick 2636*b24ab676SJeff Bonwick if (asize != psize) { 2637*b24ab676SJeff Bonwick abuf = zio_buf_alloc(asize); 2638*b24ab676SJeff Bonwick bcopy(zio->io_data, abuf, psize); 2639*b24ab676SJeff Bonwick bzero(abuf + psize, asize - psize); 2640*b24ab676SJeff Bonwick } 2641*b24ab676SJeff Bonwick 2642*b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 2643*b24ab676SJeff Bonwick zcr->zcr_next = NULL; 2644*b24ab676SJeff Bonwick zcr->zcr_finish(zcr, abuf); 2645*b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 2646*b24ab676SJeff Bonwick 2647*b24ab676SJeff Bonwick if (asize != psize) 2648*b24ab676SJeff Bonwick zio_buf_free(abuf, asize); 2649*b24ab676SJeff Bonwick } 2650*b24ab676SJeff Bonwick } 2651e14bb325SJeff Bonwick 2652e14bb325SJeff Bonwick zio_pop_transforms(zio); /* note: may set zio->io_error */ 2653e14bb325SJeff Bonwick 2654e14bb325SJeff Bonwick vdev_stat_update(zio, psize); 2655e14bb325SJeff Bonwick 2656e14bb325SJeff Bonwick if (zio->io_error) { 2657e14bb325SJeff Bonwick /* 2658e14bb325SJeff Bonwick * If this I/O is attached to a particular vdev, 2659e14bb325SJeff Bonwick * generate an error message describing the I/O failure 2660e14bb325SJeff Bonwick * at the block level. We ignore these errors if the 2661e14bb325SJeff Bonwick * device is currently unavailable. 2662e14bb325SJeff Bonwick */ 2663e14bb325SJeff Bonwick if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) 2664e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, zio, 0, 0); 2665e14bb325SJeff Bonwick 26668f18d1faSGeorge Wilson if ((zio->io_error == EIO || !(zio->io_flags & 26678f18d1faSGeorge Wilson (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && 26688f18d1faSGeorge Wilson zio == lio) { 2669e14bb325SJeff Bonwick /* 2670e14bb325SJeff Bonwick * For logical I/O requests, tell the SPA to log the 2671e14bb325SJeff Bonwick * error and generate a logical data ereport. 2672e14bb325SJeff Bonwick */ 2673e14bb325SJeff Bonwick spa_log_error(spa, zio); 2674e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, zio, 2675e14bb325SJeff Bonwick 0, 0); 2676e14bb325SJeff Bonwick } 2677e14bb325SJeff Bonwick } 2678fa9e4066Sahrens 2679e14bb325SJeff Bonwick if (zio->io_error && zio == lio) { 2680e14bb325SJeff Bonwick /* 2681e14bb325SJeff Bonwick * Determine whether zio should be reexecuted. This will 2682e14bb325SJeff Bonwick * propagate all the way to the root via zio_notify_parent(). 2683e14bb325SJeff Bonwick */ 2684e14bb325SJeff Bonwick ASSERT(vd == NULL && bp != NULL); 2685*b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2686e14bb325SJeff Bonwick 2687*b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(zio) && 2688*b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_CANFAIL)) { 2689e14bb325SJeff Bonwick if (zio->io_error != ENOSPC) 2690e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_NOW; 2691e14bb325SJeff Bonwick else 2692e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2693*b24ab676SJeff Bonwick } 2694e14bb325SJeff Bonwick 2695e14bb325SJeff Bonwick if ((zio->io_type == ZIO_TYPE_READ || 2696e14bb325SJeff Bonwick zio->io_type == ZIO_TYPE_FREE) && 2697e14bb325SJeff Bonwick zio->io_error == ENXIO && 26988ad4d6ddSJeff Bonwick spa->spa_load_state == SPA_LOAD_NONE && 2699e14bb325SJeff Bonwick spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) 2700e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2701e14bb325SJeff Bonwick 2702e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) 2703e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 270422fe2c88SJonathan Adams 270522fe2c88SJonathan Adams /* 270622fe2c88SJonathan Adams * Here is a possibly good place to attempt to do 270722fe2c88SJonathan Adams * either combinatorial reconstruction or error correction 270822fe2c88SJonathan Adams * based on checksums. It also might be a good place 270922fe2c88SJonathan Adams * to send out preliminary ereports before we suspend 271022fe2c88SJonathan Adams * processing. 271122fe2c88SJonathan Adams */ 2712d63d470bSgw } 2713d63d470bSgw 271467bd71c6Sperrin /* 2715e14bb325SJeff Bonwick * If there were logical child errors, they apply to us now. 2716e14bb325SJeff Bonwick * We defer this until now to avoid conflating logical child 2717e14bb325SJeff Bonwick * errors with errors that happened to the zio itself when 2718e14bb325SJeff Bonwick * updating vdev stats and reporting FMA events above. 271967bd71c6Sperrin */ 2720e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); 27218654d025Sperrin 2722*b24ab676SJeff Bonwick if ((zio->io_error || zio->io_reexecute) && 2723*b24ab676SJeff Bonwick IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && 2724*b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REWRITE)) 2725f5383399SBill Moore zio_dva_unallocate(zio, zio->io_gang_tree, bp); 2726f5383399SBill Moore 2727f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 2728f5383399SBill Moore 272933a372edSGeorge Wilson /* 273033a372edSGeorge Wilson * Godfather I/Os should never suspend. 273133a372edSGeorge Wilson */ 273233a372edSGeorge Wilson if ((zio->io_flags & ZIO_FLAG_GODFATHER) && 273333a372edSGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) 273433a372edSGeorge Wilson zio->io_reexecute = 0; 273533a372edSGeorge Wilson 273633a372edSGeorge Wilson if (zio->io_reexecute) { 2737e14bb325SJeff Bonwick /* 2738e14bb325SJeff Bonwick * This is a logical I/O that wants to reexecute. 2739e14bb325SJeff Bonwick * 2740e14bb325SJeff Bonwick * Reexecute is top-down. When an i/o fails, if it's not 2741e14bb325SJeff Bonwick * the root, it simply notifies its parent and sticks around. 2742e14bb325SJeff Bonwick * The parent, seeing that it still has children in zio_done(), 2743e14bb325SJeff Bonwick * does the same. This percolates all the way up to the root. 2744e14bb325SJeff Bonwick * The root i/o will reexecute or suspend the entire tree. 2745e14bb325SJeff Bonwick * 2746e14bb325SJeff Bonwick * This approach ensures that zio_reexecute() honors 2747e14bb325SJeff Bonwick * all the original i/o dependency relationships, e.g. 2748e14bb325SJeff Bonwick * parents not executing until children are ready. 2749e14bb325SJeff Bonwick */ 2750e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2751fa9e4066Sahrens 2752f5383399SBill Moore zio->io_gang_leader = NULL; 2753e14bb325SJeff Bonwick 2754a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2755a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 2756a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2757a3f829aeSBill Moore 275854d692b7SGeorge Wilson /* 275954d692b7SGeorge Wilson * "The Godfather" I/O monitors its children but is 276054d692b7SGeorge Wilson * not a true parent to them. It will track them through 276154d692b7SGeorge Wilson * the pipeline but severs its ties whenever they get into 276254d692b7SGeorge Wilson * trouble (e.g. suspended). This allows "The Godfather" 276354d692b7SGeorge Wilson * I/O to return status without blocking. 276454d692b7SGeorge Wilson */ 276554d692b7SGeorge Wilson for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 276654d692b7SGeorge Wilson zio_link_t *zl = zio->io_walk_link; 276754d692b7SGeorge Wilson pio_next = zio_walk_parents(zio); 276854d692b7SGeorge Wilson 276954d692b7SGeorge Wilson if ((pio->io_flags & ZIO_FLAG_GODFATHER) && 277054d692b7SGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { 277154d692b7SGeorge Wilson zio_remove_child(pio, zio, zl); 277254d692b7SGeorge Wilson zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 277354d692b7SGeorge Wilson } 277454d692b7SGeorge Wilson } 277554d692b7SGeorge Wilson 2776a3f829aeSBill Moore if ((pio = zio_unique_parent(zio)) != NULL) { 2777e14bb325SJeff Bonwick /* 2778e14bb325SJeff Bonwick * We're not a root i/o, so there's nothing to do 2779e14bb325SJeff Bonwick * but notify our parent. Don't propagate errors 2780e14bb325SJeff Bonwick * upward since we haven't permanently failed yet. 2781e14bb325SJeff Bonwick */ 278233a372edSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 2783e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; 2784e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2785e14bb325SJeff Bonwick } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { 2786e14bb325SJeff Bonwick /* 2787e14bb325SJeff Bonwick * We'd fail again if we reexecuted now, so suspend 2788e14bb325SJeff Bonwick * until conditions improve (e.g. device comes online). 2789e14bb325SJeff Bonwick */ 2790e14bb325SJeff Bonwick zio_suspend(spa, zio); 2791e14bb325SJeff Bonwick } else { 2792e14bb325SJeff Bonwick /* 2793e14bb325SJeff Bonwick * Reexecution is potentially a huge amount of work. 2794e14bb325SJeff Bonwick * Hand it off to the otherwise-unused claim taskq. 2795e14bb325SJeff Bonwick */ 2796e14bb325SJeff Bonwick (void) taskq_dispatch( 2797e14bb325SJeff Bonwick spa->spa_zio_taskq[ZIO_TYPE_CLAIM][ZIO_TASKQ_ISSUE], 2798e14bb325SJeff Bonwick (task_func_t *)zio_reexecute, zio, TQ_SLEEP); 2799e14bb325SJeff Bonwick } 2800e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2801fa9e4066Sahrens } 2802fa9e4066Sahrens 2803*b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 280433a372edSGeorge Wilson ASSERT(zio->io_reexecute == 0); 2805e14bb325SJeff Bonwick ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); 2806fa9e4066Sahrens 2807*b24ab676SJeff Bonwick /* 2808*b24ab676SJeff Bonwick * Report any checksum errors, since the I/O is complete. 2809*b24ab676SJeff Bonwick */ 281022fe2c88SJonathan Adams while (zio->io_cksum_report != NULL) { 2811*b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 2812*b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 2813*b24ab676SJeff Bonwick zcr->zcr_next = NULL; 2814*b24ab676SJeff Bonwick zcr->zcr_finish(zcr, NULL); 2815*b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 281622fe2c88SJonathan Adams } 281722fe2c88SJonathan Adams 2818a3f829aeSBill Moore /* 2819a3f829aeSBill Moore * It is the responsibility of the done callback to ensure that this 2820a3f829aeSBill Moore * particular zio is no longer discoverable for adoption, and as 2821a3f829aeSBill Moore * such, cannot acquire any new parents. 2822a3f829aeSBill Moore */ 2823e14bb325SJeff Bonwick if (zio->io_done) 2824e14bb325SJeff Bonwick zio->io_done(zio); 2825fa9e4066Sahrens 2826a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2827a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 2828a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2829fa9e4066Sahrens 2830a3f829aeSBill Moore for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 2831a3f829aeSBill Moore zio_link_t *zl = zio->io_walk_link; 2832a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2833a3f829aeSBill Moore zio_remove_child(pio, zio, zl); 2834e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2835e14bb325SJeff Bonwick } 2836fa9e4066Sahrens 2837e14bb325SJeff Bonwick if (zio->io_waiter != NULL) { 2838e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 2839e14bb325SJeff Bonwick zio->io_executor = NULL; 2840e14bb325SJeff Bonwick cv_broadcast(&zio->io_cv); 2841e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 2842e14bb325SJeff Bonwick } else { 2843e14bb325SJeff Bonwick zio_destroy(zio); 2844e14bb325SJeff Bonwick } 2845fa9e4066Sahrens 2846e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2847fa9e4066Sahrens } 284846341222Sperrin 284946341222Sperrin /* 2850e14bb325SJeff Bonwick * ========================================================================== 2851e14bb325SJeff Bonwick * I/O pipeline definition 2852e14bb325SJeff Bonwick * ========================================================================== 285346341222Sperrin */ 2854*b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[] = { 2855e14bb325SJeff Bonwick NULL, 2856e14bb325SJeff Bonwick zio_read_bp_init, 2857*b24ab676SJeff Bonwick zio_free_bp_init, 2858*b24ab676SJeff Bonwick zio_issue_async, 2859e14bb325SJeff Bonwick zio_write_bp_init, 2860e14bb325SJeff Bonwick zio_checksum_generate, 2861*b24ab676SJeff Bonwick zio_ddt_read_start, 2862*b24ab676SJeff Bonwick zio_ddt_read_done, 2863*b24ab676SJeff Bonwick zio_ddt_write, 2864*b24ab676SJeff Bonwick zio_ddt_free, 2865e14bb325SJeff Bonwick zio_gang_assemble, 2866e14bb325SJeff Bonwick zio_gang_issue, 2867e14bb325SJeff Bonwick zio_dva_allocate, 2868e14bb325SJeff Bonwick zio_dva_free, 2869e14bb325SJeff Bonwick zio_dva_claim, 2870e14bb325SJeff Bonwick zio_ready, 2871e14bb325SJeff Bonwick zio_vdev_io_start, 2872e14bb325SJeff Bonwick zio_vdev_io_done, 2873e14bb325SJeff Bonwick zio_vdev_io_assess, 2874e14bb325SJeff Bonwick zio_checksum_verify, 2875e14bb325SJeff Bonwick zio_done 2876e14bb325SJeff Bonwick }; 2877