1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 22a3f829aeSBill Moore * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #include <sys/zfs_context.h> 27ea8dc4b6Seschrock #include <sys/fm/fs/zfs.h> 28fa9e4066Sahrens #include <sys/spa.h> 29fa9e4066Sahrens #include <sys/txg.h> 30fa9e4066Sahrens #include <sys/spa_impl.h> 31fa9e4066Sahrens #include <sys/vdev_impl.h> 32fa9e4066Sahrens #include <sys/zio_impl.h> 33fa9e4066Sahrens #include <sys/zio_compress.h> 34fa9e4066Sahrens #include <sys/zio_checksum.h> 35b24ab676SJeff Bonwick #include <sys/dmu_objset.h> 36b24ab676SJeff Bonwick #include <sys/arc.h> 37b24ab676SJeff Bonwick #include <sys/ddt.h> 38fa9e4066Sahrens 39fa9e4066Sahrens /* 40fa9e4066Sahrens * ========================================================================== 41fa9e4066Sahrens * I/O priority table 42fa9e4066Sahrens * ========================================================================== 43fa9e4066Sahrens */ 44fa9e4066Sahrens uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE] = { 45fa9e4066Sahrens 0, /* ZIO_PRIORITY_NOW */ 46fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_READ */ 47fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_WRITE */ 48fa9e4066Sahrens 0, /* ZIO_PRIORITY_LOG_WRITE */ 49*80eb36f2SGeorge Wilson 1, /* ZIO_PRIORITY_CACHE_FILL */ 50*80eb36f2SGeorge Wilson 1, /* ZIO_PRIORITY_AGG */ 51*80eb36f2SGeorge Wilson 4, /* ZIO_PRIORITY_FREE */ 52*80eb36f2SGeorge Wilson 4, /* ZIO_PRIORITY_ASYNC_WRITE */ 53*80eb36f2SGeorge Wilson 6, /* ZIO_PRIORITY_ASYNC_READ */ 54fa9e4066Sahrens 10, /* ZIO_PRIORITY_RESILVER */ 55fa9e4066Sahrens 20, /* ZIO_PRIORITY_SCRUB */ 56fa9e4066Sahrens }; 57fa9e4066Sahrens 58fa9e4066Sahrens /* 59fa9e4066Sahrens * ========================================================================== 60fa9e4066Sahrens * I/O type descriptions 61fa9e4066Sahrens * ========================================================================== 62fa9e4066Sahrens */ 63fa9e4066Sahrens char *zio_type_name[ZIO_TYPES] = { 64*80eb36f2SGeorge Wilson "zio_null", "zio_read", "zio_write", "zio_free", "zio_claim", 65*80eb36f2SGeorge Wilson "zio_ioctl" 66*80eb36f2SGeorge Wilson }; 67fa9e4066Sahrens 68fa9e4066Sahrens /* 69fa9e4066Sahrens * ========================================================================== 70fa9e4066Sahrens * I/O kmem caches 71fa9e4066Sahrens * ========================================================================== 72fa9e4066Sahrens */ 73ccae0b50Seschrock kmem_cache_t *zio_cache; 74a3f829aeSBill Moore kmem_cache_t *zio_link_cache; 75fa9e4066Sahrens kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 76ad23a2dbSjohansen kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 77ad23a2dbSjohansen 78ad23a2dbSjohansen #ifdef _KERNEL 79ad23a2dbSjohansen extern vmem_t *zio_alloc_arena; 80ad23a2dbSjohansen #endif 81fa9e4066Sahrens 820a4e9518Sgw /* 83e14bb325SJeff Bonwick * An allocating zio is one that either currently has the DVA allocate 84e14bb325SJeff Bonwick * stage set or will have it later in its lifetime. 850a4e9518Sgw */ 86b24ab676SJeff Bonwick #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) 87b24ab676SJeff Bonwick 88b24ab676SJeff Bonwick #ifdef ZFS_DEBUG 89b24ab676SJeff Bonwick int zio_buf_debug_limit = 16384; 90b24ab676SJeff Bonwick #else 91b24ab676SJeff Bonwick int zio_buf_debug_limit = 0; 92b24ab676SJeff Bonwick #endif 930a4e9518Sgw 94fa9e4066Sahrens void 95fa9e4066Sahrens zio_init(void) 96fa9e4066Sahrens { 97fa9e4066Sahrens size_t c; 98ad23a2dbSjohansen vmem_t *data_alloc_arena = NULL; 99ad23a2dbSjohansen 100ad23a2dbSjohansen #ifdef _KERNEL 101ad23a2dbSjohansen data_alloc_arena = zio_alloc_arena; 102ad23a2dbSjohansen #endif 103a3f829aeSBill Moore zio_cache = kmem_cache_create("zio_cache", 104a3f829aeSBill Moore sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 105a3f829aeSBill Moore zio_link_cache = kmem_cache_create("zio_link_cache", 106a3f829aeSBill Moore sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 107ccae0b50Seschrock 108fa9e4066Sahrens /* 109fa9e4066Sahrens * For small buffers, we want a cache for each multiple of 110fa9e4066Sahrens * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache 111fa9e4066Sahrens * for each quarter-power of 2. For large buffers, we want 112fa9e4066Sahrens * a cache for each multiple of PAGESIZE. 113fa9e4066Sahrens */ 114fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 115fa9e4066Sahrens size_t size = (c + 1) << SPA_MINBLOCKSHIFT; 116fa9e4066Sahrens size_t p2 = size; 117fa9e4066Sahrens size_t align = 0; 118fa9e4066Sahrens 119fa9e4066Sahrens while (p2 & (p2 - 1)) 120fa9e4066Sahrens p2 &= p2 - 1; 121fa9e4066Sahrens 122fa9e4066Sahrens if (size <= 4 * SPA_MINBLOCKSIZE) { 123fa9e4066Sahrens align = SPA_MINBLOCKSIZE; 124fa9e4066Sahrens } else if (P2PHASE(size, PAGESIZE) == 0) { 125fa9e4066Sahrens align = PAGESIZE; 126fa9e4066Sahrens } else if (P2PHASE(size, p2 >> 2) == 0) { 127fa9e4066Sahrens align = p2 >> 2; 128fa9e4066Sahrens } 129fa9e4066Sahrens 130fa9e4066Sahrens if (align != 0) { 131ad23a2dbSjohansen char name[36]; 1325ad82045Snd (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); 133fa9e4066Sahrens zio_buf_cache[c] = kmem_cache_create(name, size, 134b24ab676SJeff Bonwick align, NULL, NULL, NULL, NULL, NULL, 135b24ab676SJeff Bonwick size > zio_buf_debug_limit ? KMC_NODEBUG : 0); 136ad23a2dbSjohansen 137ad23a2dbSjohansen (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); 138ad23a2dbSjohansen zio_data_buf_cache[c] = kmem_cache_create(name, size, 139ad23a2dbSjohansen align, NULL, NULL, NULL, NULL, data_alloc_arena, 140b24ab676SJeff Bonwick size > zio_buf_debug_limit ? KMC_NODEBUG : 0); 141fa9e4066Sahrens } 142fa9e4066Sahrens } 143fa9e4066Sahrens 144fa9e4066Sahrens while (--c != 0) { 145fa9e4066Sahrens ASSERT(zio_buf_cache[c] != NULL); 146fa9e4066Sahrens if (zio_buf_cache[c - 1] == NULL) 147fa9e4066Sahrens zio_buf_cache[c - 1] = zio_buf_cache[c]; 148ad23a2dbSjohansen 149ad23a2dbSjohansen ASSERT(zio_data_buf_cache[c] != NULL); 150ad23a2dbSjohansen if (zio_data_buf_cache[c - 1] == NULL) 151ad23a2dbSjohansen zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; 152fa9e4066Sahrens } 153ea8dc4b6Seschrock 154ea8dc4b6Seschrock zio_inject_init(); 155fa9e4066Sahrens } 156fa9e4066Sahrens 157fa9e4066Sahrens void 158fa9e4066Sahrens zio_fini(void) 159fa9e4066Sahrens { 160fa9e4066Sahrens size_t c; 161fa9e4066Sahrens kmem_cache_t *last_cache = NULL; 162ad23a2dbSjohansen kmem_cache_t *last_data_cache = NULL; 163fa9e4066Sahrens 164fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 165fa9e4066Sahrens if (zio_buf_cache[c] != last_cache) { 166fa9e4066Sahrens last_cache = zio_buf_cache[c]; 167fa9e4066Sahrens kmem_cache_destroy(zio_buf_cache[c]); 168fa9e4066Sahrens } 169fa9e4066Sahrens zio_buf_cache[c] = NULL; 170ad23a2dbSjohansen 171ad23a2dbSjohansen if (zio_data_buf_cache[c] != last_data_cache) { 172ad23a2dbSjohansen last_data_cache = zio_data_buf_cache[c]; 173ad23a2dbSjohansen kmem_cache_destroy(zio_data_buf_cache[c]); 174ad23a2dbSjohansen } 175ad23a2dbSjohansen zio_data_buf_cache[c] = NULL; 176fa9e4066Sahrens } 177ea8dc4b6Seschrock 178a3f829aeSBill Moore kmem_cache_destroy(zio_link_cache); 179ccae0b50Seschrock kmem_cache_destroy(zio_cache); 180ccae0b50Seschrock 181ea8dc4b6Seschrock zio_inject_fini(); 182fa9e4066Sahrens } 183fa9e4066Sahrens 184fa9e4066Sahrens /* 185fa9e4066Sahrens * ========================================================================== 186fa9e4066Sahrens * Allocate and free I/O buffers 187fa9e4066Sahrens * ========================================================================== 188fa9e4066Sahrens */ 189ad23a2dbSjohansen 190ad23a2dbSjohansen /* 191ad23a2dbSjohansen * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a 192ad23a2dbSjohansen * crashdump if the kernel panics, so use it judiciously. Obviously, it's 193ad23a2dbSjohansen * useful to inspect ZFS metadata, but if possible, we should avoid keeping 194ad23a2dbSjohansen * excess / transient data in-core during a crashdump. 195ad23a2dbSjohansen */ 196fa9e4066Sahrens void * 197fa9e4066Sahrens zio_buf_alloc(size_t size) 198fa9e4066Sahrens { 199fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 200fa9e4066Sahrens 201fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 202fa9e4066Sahrens 2031ab7f2deSmaybee return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); 204fa9e4066Sahrens } 205fa9e4066Sahrens 206ad23a2dbSjohansen /* 207ad23a2dbSjohansen * Use zio_data_buf_alloc to allocate data. The data will not appear in a 208ad23a2dbSjohansen * crashdump if the kernel panics. This exists so that we will limit the amount 209ad23a2dbSjohansen * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount 210ad23a2dbSjohansen * of kernel heap dumped to disk when the kernel panics) 211ad23a2dbSjohansen */ 212ad23a2dbSjohansen void * 213ad23a2dbSjohansen zio_data_buf_alloc(size_t size) 214ad23a2dbSjohansen { 215ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 216ad23a2dbSjohansen 217ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 218ad23a2dbSjohansen 2191ab7f2deSmaybee return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); 220ad23a2dbSjohansen } 221ad23a2dbSjohansen 222fa9e4066Sahrens void 223fa9e4066Sahrens zio_buf_free(void *buf, size_t size) 224fa9e4066Sahrens { 225fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 226fa9e4066Sahrens 227fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 228fa9e4066Sahrens 229fa9e4066Sahrens kmem_cache_free(zio_buf_cache[c], buf); 230fa9e4066Sahrens } 231fa9e4066Sahrens 232ad23a2dbSjohansen void 233ad23a2dbSjohansen zio_data_buf_free(void *buf, size_t size) 234ad23a2dbSjohansen { 235ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 236ad23a2dbSjohansen 237ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 238ad23a2dbSjohansen 239ad23a2dbSjohansen kmem_cache_free(zio_data_buf_cache[c], buf); 240ad23a2dbSjohansen } 241b3995adbSahrens 242fa9e4066Sahrens /* 243fa9e4066Sahrens * ========================================================================== 244fa9e4066Sahrens * Push and pop I/O transform buffers 245fa9e4066Sahrens * ========================================================================== 246fa9e4066Sahrens */ 247fa9e4066Sahrens static void 248e14bb325SJeff Bonwick zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, 249e14bb325SJeff Bonwick zio_transform_func_t *transform) 250fa9e4066Sahrens { 251fa9e4066Sahrens zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); 252fa9e4066Sahrens 253e14bb325SJeff Bonwick zt->zt_orig_data = zio->io_data; 254e14bb325SJeff Bonwick zt->zt_orig_size = zio->io_size; 255fa9e4066Sahrens zt->zt_bufsize = bufsize; 256e14bb325SJeff Bonwick zt->zt_transform = transform; 257fa9e4066Sahrens 258fa9e4066Sahrens zt->zt_next = zio->io_transform_stack; 259fa9e4066Sahrens zio->io_transform_stack = zt; 260fa9e4066Sahrens 261fa9e4066Sahrens zio->io_data = data; 262fa9e4066Sahrens zio->io_size = size; 263fa9e4066Sahrens } 264fa9e4066Sahrens 265fa9e4066Sahrens static void 266e14bb325SJeff Bonwick zio_pop_transforms(zio_t *zio) 267fa9e4066Sahrens { 268e14bb325SJeff Bonwick zio_transform_t *zt; 269e14bb325SJeff Bonwick 270e14bb325SJeff Bonwick while ((zt = zio->io_transform_stack) != NULL) { 271e14bb325SJeff Bonwick if (zt->zt_transform != NULL) 272e14bb325SJeff Bonwick zt->zt_transform(zio, 273e14bb325SJeff Bonwick zt->zt_orig_data, zt->zt_orig_size); 274fa9e4066Sahrens 275b24ab676SJeff Bonwick if (zt->zt_bufsize != 0) 276b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zt->zt_bufsize); 277fa9e4066Sahrens 278e14bb325SJeff Bonwick zio->io_data = zt->zt_orig_data; 279e14bb325SJeff Bonwick zio->io_size = zt->zt_orig_size; 280e14bb325SJeff Bonwick zio->io_transform_stack = zt->zt_next; 281fa9e4066Sahrens 282e14bb325SJeff Bonwick kmem_free(zt, sizeof (zio_transform_t)); 283fa9e4066Sahrens } 284fa9e4066Sahrens } 285fa9e4066Sahrens 286e14bb325SJeff Bonwick /* 287e14bb325SJeff Bonwick * ========================================================================== 288e14bb325SJeff Bonwick * I/O transform callbacks for subblocks and decompression 289e14bb325SJeff Bonwick * ========================================================================== 290e14bb325SJeff Bonwick */ 291e14bb325SJeff Bonwick static void 292e14bb325SJeff Bonwick zio_subblock(zio_t *zio, void *data, uint64_t size) 293e14bb325SJeff Bonwick { 294e14bb325SJeff Bonwick ASSERT(zio->io_size > size); 295e14bb325SJeff Bonwick 296e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ) 297e14bb325SJeff Bonwick bcopy(zio->io_data, data, size); 298e14bb325SJeff Bonwick } 299e14bb325SJeff Bonwick 300e14bb325SJeff Bonwick static void 301e14bb325SJeff Bonwick zio_decompress(zio_t *zio, void *data, uint64_t size) 302e14bb325SJeff Bonwick { 303e14bb325SJeff Bonwick if (zio->io_error == 0 && 304e14bb325SJeff Bonwick zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), 305b24ab676SJeff Bonwick zio->io_data, data, zio->io_size, size) != 0) 306e14bb325SJeff Bonwick zio->io_error = EIO; 307e14bb325SJeff Bonwick } 308e14bb325SJeff Bonwick 309e14bb325SJeff Bonwick /* 310e14bb325SJeff Bonwick * ========================================================================== 311e14bb325SJeff Bonwick * I/O parent/child relationships and pipeline interlocks 312e14bb325SJeff Bonwick * ========================================================================== 313e14bb325SJeff Bonwick */ 314a3f829aeSBill Moore /* 315a3f829aeSBill Moore * NOTE - Callers to zio_walk_parents() and zio_walk_children must 316a3f829aeSBill Moore * continue calling these functions until they return NULL. 317a3f829aeSBill Moore * Otherwise, the next caller will pick up the list walk in 318a3f829aeSBill Moore * some indeterminate state. (Otherwise every caller would 319a3f829aeSBill Moore * have to pass in a cookie to keep the state represented by 320a3f829aeSBill Moore * io_walk_link, which gets annoying.) 321a3f829aeSBill Moore */ 322a3f829aeSBill Moore zio_t * 323a3f829aeSBill Moore zio_walk_parents(zio_t *cio) 324a3f829aeSBill Moore { 325a3f829aeSBill Moore zio_link_t *zl = cio->io_walk_link; 326a3f829aeSBill Moore list_t *pl = &cio->io_parent_list; 327e14bb325SJeff Bonwick 328a3f829aeSBill Moore zl = (zl == NULL) ? list_head(pl) : list_next(pl, zl); 329a3f829aeSBill Moore cio->io_walk_link = zl; 330a3f829aeSBill Moore 331a3f829aeSBill Moore if (zl == NULL) 332a3f829aeSBill Moore return (NULL); 333a3f829aeSBill Moore 334a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 335a3f829aeSBill Moore return (zl->zl_parent); 336a3f829aeSBill Moore } 337a3f829aeSBill Moore 338a3f829aeSBill Moore zio_t * 339a3f829aeSBill Moore zio_walk_children(zio_t *pio) 340a3f829aeSBill Moore { 341a3f829aeSBill Moore zio_link_t *zl = pio->io_walk_link; 342a3f829aeSBill Moore list_t *cl = &pio->io_child_list; 343a3f829aeSBill Moore 344a3f829aeSBill Moore zl = (zl == NULL) ? list_head(cl) : list_next(cl, zl); 345a3f829aeSBill Moore pio->io_walk_link = zl; 346a3f829aeSBill Moore 347a3f829aeSBill Moore if (zl == NULL) 348a3f829aeSBill Moore return (NULL); 349a3f829aeSBill Moore 350a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 351a3f829aeSBill Moore return (zl->zl_child); 352a3f829aeSBill Moore } 353a3f829aeSBill Moore 354a3f829aeSBill Moore zio_t * 355a3f829aeSBill Moore zio_unique_parent(zio_t *cio) 356a3f829aeSBill Moore { 357a3f829aeSBill Moore zio_t *pio = zio_walk_parents(cio); 358a3f829aeSBill Moore 359a3f829aeSBill Moore VERIFY(zio_walk_parents(cio) == NULL); 360a3f829aeSBill Moore return (pio); 361a3f829aeSBill Moore } 362a3f829aeSBill Moore 363a3f829aeSBill Moore void 364a3f829aeSBill Moore zio_add_child(zio_t *pio, zio_t *cio) 365e14bb325SJeff Bonwick { 366a3f829aeSBill Moore zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); 367a3f829aeSBill Moore 368a3f829aeSBill Moore /* 369a3f829aeSBill Moore * Logical I/Os can have logical, gang, or vdev children. 370a3f829aeSBill Moore * Gang I/Os can have gang or vdev children. 371a3f829aeSBill Moore * Vdev I/Os can only have vdev children. 372a3f829aeSBill Moore * The following ASSERT captures all of these constraints. 373a3f829aeSBill Moore */ 374a3f829aeSBill Moore ASSERT(cio->io_child_type <= pio->io_child_type); 375a3f829aeSBill Moore 376a3f829aeSBill Moore zl->zl_parent = pio; 377a3f829aeSBill Moore zl->zl_child = cio; 378a3f829aeSBill Moore 379a3f829aeSBill Moore mutex_enter(&cio->io_lock); 380e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 381a3f829aeSBill Moore 382a3f829aeSBill Moore ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); 383a3f829aeSBill Moore 384a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 385a3f829aeSBill Moore pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; 386a3f829aeSBill Moore 387a3f829aeSBill Moore list_insert_head(&pio->io_child_list, zl); 388a3f829aeSBill Moore list_insert_head(&cio->io_parent_list, zl); 389a3f829aeSBill Moore 390b24ab676SJeff Bonwick pio->io_child_count++; 391b24ab676SJeff Bonwick cio->io_parent_count++; 392b24ab676SJeff Bonwick 393e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 394a3f829aeSBill Moore mutex_exit(&cio->io_lock); 395e14bb325SJeff Bonwick } 396e14bb325SJeff Bonwick 397fa9e4066Sahrens static void 398a3f829aeSBill Moore zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) 399e14bb325SJeff Bonwick { 400a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 401a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 402e14bb325SJeff Bonwick 403a3f829aeSBill Moore mutex_enter(&cio->io_lock); 404e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 405a3f829aeSBill Moore 406a3f829aeSBill Moore list_remove(&pio->io_child_list, zl); 407a3f829aeSBill Moore list_remove(&cio->io_parent_list, zl); 408a3f829aeSBill Moore 409b24ab676SJeff Bonwick pio->io_child_count--; 410b24ab676SJeff Bonwick cio->io_parent_count--; 411b24ab676SJeff Bonwick 412e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 413a3f829aeSBill Moore mutex_exit(&cio->io_lock); 414a3f829aeSBill Moore 415a3f829aeSBill Moore kmem_cache_free(zio_link_cache, zl); 416e14bb325SJeff Bonwick } 417e14bb325SJeff Bonwick 418e14bb325SJeff Bonwick static boolean_t 419e14bb325SJeff Bonwick zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) 420fa9e4066Sahrens { 421e14bb325SJeff Bonwick uint64_t *countp = &zio->io_children[child][wait]; 422e14bb325SJeff Bonwick boolean_t waiting = B_FALSE; 423e14bb325SJeff Bonwick 424e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 425e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 426e14bb325SJeff Bonwick if (*countp != 0) { 427b24ab676SJeff Bonwick zio->io_stage >>= 1; 428e14bb325SJeff Bonwick zio->io_stall = countp; 429e14bb325SJeff Bonwick waiting = B_TRUE; 430e14bb325SJeff Bonwick } 431e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 432e14bb325SJeff Bonwick 433e14bb325SJeff Bonwick return (waiting); 434e14bb325SJeff Bonwick } 435fa9e4066Sahrens 436e14bb325SJeff Bonwick static void 437e14bb325SJeff Bonwick zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) 438e14bb325SJeff Bonwick { 439e14bb325SJeff Bonwick uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; 440e14bb325SJeff Bonwick int *errorp = &pio->io_child_error[zio->io_child_type]; 441fa9e4066Sahrens 442e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 443e14bb325SJeff Bonwick if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 444e14bb325SJeff Bonwick *errorp = zio_worst_error(*errorp, zio->io_error); 445e14bb325SJeff Bonwick pio->io_reexecute |= zio->io_reexecute; 446e14bb325SJeff Bonwick ASSERT3U(*countp, >, 0); 447e14bb325SJeff Bonwick if (--*countp == 0 && pio->io_stall == countp) { 448e14bb325SJeff Bonwick pio->io_stall = NULL; 449e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 450e14bb325SJeff Bonwick zio_execute(pio); 451e14bb325SJeff Bonwick } else { 452e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 453fa9e4066Sahrens } 454fa9e4066Sahrens } 455fa9e4066Sahrens 456e14bb325SJeff Bonwick static void 457e14bb325SJeff Bonwick zio_inherit_child_errors(zio_t *zio, enum zio_child c) 458e14bb325SJeff Bonwick { 459e14bb325SJeff Bonwick if (zio->io_child_error[c] != 0 && zio->io_error == 0) 460e14bb325SJeff Bonwick zio->io_error = zio->io_child_error[c]; 461e14bb325SJeff Bonwick } 462e14bb325SJeff Bonwick 463fa9e4066Sahrens /* 464fa9e4066Sahrens * ========================================================================== 465e14bb325SJeff Bonwick * Create the various types of I/O (read, write, free, etc) 466fa9e4066Sahrens * ========================================================================== 467fa9e4066Sahrens */ 468fa9e4066Sahrens static zio_t * 469b24ab676SJeff Bonwick zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 470fa9e4066Sahrens void *data, uint64_t size, zio_done_func_t *done, void *private, 471b24ab676SJeff Bonwick zio_type_t type, int priority, enum zio_flag flags, 472b24ab676SJeff Bonwick vdev_t *vd, uint64_t offset, const zbookmark_t *zb, 473b24ab676SJeff Bonwick enum zio_stage stage, enum zio_stage pipeline) 474fa9e4066Sahrens { 475fa9e4066Sahrens zio_t *zio; 476fa9e4066Sahrens 477fa9e4066Sahrens ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); 478fa9e4066Sahrens ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); 479e14bb325SJeff Bonwick ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); 480fa9e4066Sahrens 481e14bb325SJeff Bonwick ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); 482e14bb325SJeff Bonwick ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); 483e14bb325SJeff Bonwick ASSERT(vd || stage == ZIO_STAGE_OPEN); 484088f3894Sahrens 485ccae0b50Seschrock zio = kmem_cache_alloc(zio_cache, KM_SLEEP); 486ccae0b50Seschrock bzero(zio, sizeof (zio_t)); 487e14bb325SJeff Bonwick 488e14bb325SJeff Bonwick mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); 489e14bb325SJeff Bonwick cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); 490e14bb325SJeff Bonwick 491a3f829aeSBill Moore list_create(&zio->io_parent_list, sizeof (zio_link_t), 492a3f829aeSBill Moore offsetof(zio_link_t, zl_parent_node)); 493a3f829aeSBill Moore list_create(&zio->io_child_list, sizeof (zio_link_t), 494a3f829aeSBill Moore offsetof(zio_link_t, zl_child_node)); 495a3f829aeSBill Moore 496e14bb325SJeff Bonwick if (vd != NULL) 497e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_VDEV; 498e14bb325SJeff Bonwick else if (flags & ZIO_FLAG_GANG_CHILD) 499e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_GANG; 500b24ab676SJeff Bonwick else if (flags & ZIO_FLAG_DDT_CHILD) 501b24ab676SJeff Bonwick zio->io_child_type = ZIO_CHILD_DDT; 502e14bb325SJeff Bonwick else 503e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_LOGICAL; 504e14bb325SJeff Bonwick 505fa9e4066Sahrens if (bp != NULL) { 506b24ab676SJeff Bonwick zio->io_bp = (blkptr_t *)bp; 507fa9e4066Sahrens zio->io_bp_copy = *bp; 508fa9e4066Sahrens zio->io_bp_orig = *bp; 509b24ab676SJeff Bonwick if (type != ZIO_TYPE_WRITE || 510b24ab676SJeff Bonwick zio->io_child_type == ZIO_CHILD_DDT) 511e14bb325SJeff Bonwick zio->io_bp = &zio->io_bp_copy; /* so caller can free */ 512f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL) 513e14bb325SJeff Bonwick zio->io_logical = zio; 514f5383399SBill Moore if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) 515f5383399SBill Moore pipeline |= ZIO_GANG_STAGES; 516fa9e4066Sahrens } 517e14bb325SJeff Bonwick 518e14bb325SJeff Bonwick zio->io_spa = spa; 519e14bb325SJeff Bonwick zio->io_txg = txg; 520fa9e4066Sahrens zio->io_done = done; 521fa9e4066Sahrens zio->io_private = private; 522fa9e4066Sahrens zio->io_type = type; 523fa9e4066Sahrens zio->io_priority = priority; 524e14bb325SJeff Bonwick zio->io_vd = vd; 525e14bb325SJeff Bonwick zio->io_offset = offset; 526b24ab676SJeff Bonwick zio->io_orig_data = zio->io_data = data; 527b24ab676SJeff Bonwick zio->io_orig_size = zio->io_size = size; 528e14bb325SJeff Bonwick zio->io_orig_flags = zio->io_flags = flags; 529e14bb325SJeff Bonwick zio->io_orig_stage = zio->io_stage = stage; 530e14bb325SJeff Bonwick zio->io_orig_pipeline = zio->io_pipeline = pipeline; 531fa9e4066Sahrens 532a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); 533a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); 534a3f829aeSBill Moore 535e14bb325SJeff Bonwick if (zb != NULL) 536e14bb325SJeff Bonwick zio->io_bookmark = *zb; 537e14bb325SJeff Bonwick 538e14bb325SJeff Bonwick if (pio != NULL) { 539e14bb325SJeff Bonwick if (zio->io_logical == NULL) 540ea8dc4b6Seschrock zio->io_logical = pio->io_logical; 541f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_GANG) 542f5383399SBill Moore zio->io_gang_leader = pio->io_gang_leader; 543e14bb325SJeff Bonwick zio_add_child(pio, zio); 544fa9e4066Sahrens } 545fa9e4066Sahrens 546fa9e4066Sahrens return (zio); 547fa9e4066Sahrens } 548fa9e4066Sahrens 5490a4e9518Sgw static void 550e14bb325SJeff Bonwick zio_destroy(zio_t *zio) 5510a4e9518Sgw { 552a3f829aeSBill Moore list_destroy(&zio->io_parent_list); 553a3f829aeSBill Moore list_destroy(&zio->io_child_list); 554e14bb325SJeff Bonwick mutex_destroy(&zio->io_lock); 555e14bb325SJeff Bonwick cv_destroy(&zio->io_cv); 556e14bb325SJeff Bonwick kmem_cache_free(zio_cache, zio); 5570a4e9518Sgw } 5580a4e9518Sgw 559fa9e4066Sahrens zio_t * 560a3f829aeSBill Moore zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, 561b24ab676SJeff Bonwick void *private, enum zio_flag flags) 562fa9e4066Sahrens { 563fa9e4066Sahrens zio_t *zio; 564fa9e4066Sahrens 565fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 566a3f829aeSBill Moore ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 567e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); 568fa9e4066Sahrens 569fa9e4066Sahrens return (zio); 570fa9e4066Sahrens } 571fa9e4066Sahrens 572fa9e4066Sahrens zio_t * 573b24ab676SJeff Bonwick zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) 574fa9e4066Sahrens { 575a3f829aeSBill Moore return (zio_null(NULL, spa, NULL, done, private, flags)); 576fa9e4066Sahrens } 577fa9e4066Sahrens 578fa9e4066Sahrens zio_t * 579e14bb325SJeff Bonwick zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 580e14bb325SJeff Bonwick void *data, uint64_t size, zio_done_func_t *done, void *private, 581b24ab676SJeff Bonwick int priority, enum zio_flag flags, const zbookmark_t *zb) 582fa9e4066Sahrens { 583fa9e4066Sahrens zio_t *zio; 584fa9e4066Sahrens 585b24ab676SJeff Bonwick zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, 586088f3894Sahrens data, size, done, private, 587e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, NULL, 0, zb, 588b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 589b24ab676SJeff Bonwick ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); 590fa9e4066Sahrens 591fa9e4066Sahrens return (zio); 592fa9e4066Sahrens } 593fa9e4066Sahrens 594fa9e4066Sahrens zio_t * 595e14bb325SJeff Bonwick zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 596b24ab676SJeff Bonwick void *data, uint64_t size, const zio_prop_t *zp, 597e14bb325SJeff Bonwick zio_done_func_t *ready, zio_done_func_t *done, void *private, 598b24ab676SJeff Bonwick int priority, enum zio_flag flags, const zbookmark_t *zb) 599fa9e4066Sahrens { 600fa9e4066Sahrens zio_t *zio; 601fa9e4066Sahrens 602e14bb325SJeff Bonwick ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && 603e14bb325SJeff Bonwick zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && 604e14bb325SJeff Bonwick zp->zp_compress >= ZIO_COMPRESS_OFF && 605e14bb325SJeff Bonwick zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && 606e14bb325SJeff Bonwick zp->zp_type < DMU_OT_NUMTYPES && 607e14bb325SJeff Bonwick zp->zp_level < 32 && 608b24ab676SJeff Bonwick zp->zp_copies > 0 && 609b24ab676SJeff Bonwick zp->zp_copies <= spa_max_replication(spa) && 610b24ab676SJeff Bonwick zp->zp_dedup <= 1 && 611b24ab676SJeff Bonwick zp->zp_dedup_verify <= 1); 6120a4e9518Sgw 613fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 614e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 615b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 616b24ab676SJeff Bonwick ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); 617fa9e4066Sahrens 618c717a561Smaybee zio->io_ready = ready; 619e14bb325SJeff Bonwick zio->io_prop = *zp; 620fa9e4066Sahrens 621fa9e4066Sahrens return (zio); 622fa9e4066Sahrens } 623fa9e4066Sahrens 624fa9e4066Sahrens zio_t * 625e14bb325SJeff Bonwick zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, 626e14bb325SJeff Bonwick uint64_t size, zio_done_func_t *done, void *private, int priority, 627b24ab676SJeff Bonwick enum zio_flag flags, zbookmark_t *zb) 628fa9e4066Sahrens { 629fa9e4066Sahrens zio_t *zio; 630fa9e4066Sahrens 631fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 632e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 633e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); 634fa9e4066Sahrens 635fa9e4066Sahrens return (zio); 636fa9e4066Sahrens } 637fa9e4066Sahrens 638b24ab676SJeff Bonwick void 639b24ab676SJeff Bonwick zio_write_override(zio_t *zio, blkptr_t *bp, int copies) 640b24ab676SJeff Bonwick { 641b24ab676SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 642b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 643b24ab676SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 644b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); 645b24ab676SJeff Bonwick 646b24ab676SJeff Bonwick zio->io_prop.zp_copies = copies; 647b24ab676SJeff Bonwick zio->io_bp_override = bp; 648b24ab676SJeff Bonwick } 649b24ab676SJeff Bonwick 650b24ab676SJeff Bonwick void 651b24ab676SJeff Bonwick zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) 652b24ab676SJeff Bonwick { 653b24ab676SJeff Bonwick bplist_enqueue_deferred(&spa->spa_free_bplist[txg & TXG_MASK], bp); 654b24ab676SJeff Bonwick } 655b24ab676SJeff Bonwick 656fa9e4066Sahrens zio_t * 657b24ab676SJeff Bonwick zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 658b24ab676SJeff Bonwick enum zio_flag flags) 659fa9e4066Sahrens { 660fa9e4066Sahrens zio_t *zio; 661fa9e4066Sahrens 662fa9e4066Sahrens ASSERT(!BP_IS_HOLE(bp)); 663b24ab676SJeff Bonwick ASSERT(spa_syncing_txg(spa) == txg); 664b24ab676SJeff Bonwick ASSERT(spa_sync_pass(spa) <= SYNC_PASS_DEFERRED_FREE); 665fa9e4066Sahrens 666e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 667b24ab676SJeff Bonwick NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, flags, 668e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_FREE_PIPELINE); 669fa9e4066Sahrens 670fa9e4066Sahrens return (zio); 671fa9e4066Sahrens } 672fa9e4066Sahrens 673fa9e4066Sahrens zio_t * 674b24ab676SJeff Bonwick zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 675b24ab676SJeff Bonwick zio_done_func_t *done, void *private, enum zio_flag flags) 676fa9e4066Sahrens { 677fa9e4066Sahrens zio_t *zio; 678fa9e4066Sahrens 679fa9e4066Sahrens /* 680fa9e4066Sahrens * A claim is an allocation of a specific block. Claims are needed 681fa9e4066Sahrens * to support immediate writes in the intent log. The issue is that 682fa9e4066Sahrens * immediate writes contain committed data, but in a txg that was 683fa9e4066Sahrens * *not* committed. Upon opening the pool after an unclean shutdown, 684fa9e4066Sahrens * the intent log claims all blocks that contain immediate write data 685fa9e4066Sahrens * so that the SPA knows they're in use. 686fa9e4066Sahrens * 687fa9e4066Sahrens * All claims *must* be resolved in the first txg -- before the SPA 688fa9e4066Sahrens * starts allocating blocks -- so that nothing is allocated twice. 689b24ab676SJeff Bonwick * If txg == 0 we just verify that the block is claimable. 690fa9e4066Sahrens */ 691fa9e4066Sahrens ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); 692b24ab676SJeff Bonwick ASSERT(txg == spa_first_txg(spa) || txg == 0); 693b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ 694fa9e4066Sahrens 695e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 696e14bb325SJeff Bonwick done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, 697e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); 698fa9e4066Sahrens 699fa9e4066Sahrens return (zio); 700fa9e4066Sahrens } 701fa9e4066Sahrens 702fa9e4066Sahrens zio_t * 703fa9e4066Sahrens zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 704b24ab676SJeff Bonwick zio_done_func_t *done, void *private, int priority, enum zio_flag flags) 705fa9e4066Sahrens { 706fa9e4066Sahrens zio_t *zio; 707fa9e4066Sahrens int c; 708fa9e4066Sahrens 709fa9e4066Sahrens if (vd->vdev_children == 0) { 710fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 711e14bb325SJeff Bonwick ZIO_TYPE_IOCTL, priority, flags, vd, 0, NULL, 712fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); 713fa9e4066Sahrens 714fa9e4066Sahrens zio->io_cmd = cmd; 715fa9e4066Sahrens } else { 716a3f829aeSBill Moore zio = zio_null(pio, spa, NULL, NULL, NULL, flags); 717fa9e4066Sahrens 718fa9e4066Sahrens for (c = 0; c < vd->vdev_children; c++) 719fa9e4066Sahrens zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, 720fa9e4066Sahrens done, private, priority, flags)); 721fa9e4066Sahrens } 722fa9e4066Sahrens 723fa9e4066Sahrens return (zio); 724fa9e4066Sahrens } 725fa9e4066Sahrens 726fa9e4066Sahrens zio_t * 727fa9e4066Sahrens zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 728fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 729b24ab676SJeff Bonwick int priority, enum zio_flag flags, boolean_t labels) 730fa9e4066Sahrens { 731fa9e4066Sahrens zio_t *zio; 7320a4e9518Sgw 733e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 734e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 735e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 736e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 737fa9e4066Sahrens 738e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 739e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, vd, offset, NULL, 740fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); 741fa9e4066Sahrens 742e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 743fa9e4066Sahrens 744fa9e4066Sahrens return (zio); 745fa9e4066Sahrens } 746fa9e4066Sahrens 747fa9e4066Sahrens zio_t * 748fa9e4066Sahrens zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 749fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 750b24ab676SJeff Bonwick int priority, enum zio_flag flags, boolean_t labels) 751fa9e4066Sahrens { 752fa9e4066Sahrens zio_t *zio; 7530a4e9518Sgw 754e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 755e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 756e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 757e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 758fa9e4066Sahrens 759e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 760e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL, 761fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); 762fa9e4066Sahrens 763e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 764fa9e4066Sahrens 765fa9e4066Sahrens if (zio_checksum_table[checksum].ci_zbt) { 766fa9e4066Sahrens /* 767fa9e4066Sahrens * zbt checksums are necessarily destructive -- they modify 768e14bb325SJeff Bonwick * the end of the write buffer to hold the verifier/checksum. 769fa9e4066Sahrens * Therefore, we must make a local copy in case the data is 770e14bb325SJeff Bonwick * being written to multiple places in parallel. 771fa9e4066Sahrens */ 772e14bb325SJeff Bonwick void *wbuf = zio_buf_alloc(size); 773fa9e4066Sahrens bcopy(data, wbuf, size); 774e14bb325SJeff Bonwick zio_push_transform(zio, wbuf, size, size, NULL); 775fa9e4066Sahrens } 776fa9e4066Sahrens 777fa9e4066Sahrens return (zio); 778fa9e4066Sahrens } 779fa9e4066Sahrens 780fa9e4066Sahrens /* 781e14bb325SJeff Bonwick * Create a child I/O to do some work for us. 782fa9e4066Sahrens */ 783fa9e4066Sahrens zio_t * 784e14bb325SJeff Bonwick zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, 785b24ab676SJeff Bonwick void *data, uint64_t size, int type, int priority, enum zio_flag flags, 786fa9e4066Sahrens zio_done_func_t *done, void *private) 787fa9e4066Sahrens { 788b24ab676SJeff Bonwick enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; 789e14bb325SJeff Bonwick zio_t *zio; 790e14bb325SJeff Bonwick 791e14bb325SJeff Bonwick ASSERT(vd->vdev_parent == 792e14bb325SJeff Bonwick (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); 793fa9e4066Sahrens 794fa9e4066Sahrens if (type == ZIO_TYPE_READ && bp != NULL) { 795fa9e4066Sahrens /* 796fa9e4066Sahrens * If we have the bp, then the child should perform the 797fa9e4066Sahrens * checksum and the parent need not. This pushes error 798fa9e4066Sahrens * detection as close to the leaves as possible and 799fa9e4066Sahrens * eliminates redundant checksums in the interior nodes. 800fa9e4066Sahrens */ 801b24ab676SJeff Bonwick pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; 802b24ab676SJeff Bonwick pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 803fa9e4066Sahrens } 804fa9e4066Sahrens 805e14bb325SJeff Bonwick if (vd->vdev_children == 0) 806e14bb325SJeff Bonwick offset += VDEV_LABEL_START_SIZE; 807e14bb325SJeff Bonwick 808b24ab676SJeff Bonwick flags |= ZIO_VDEV_CHILD_FLAGS(pio) | ZIO_FLAG_DONT_PROPAGATE; 809b24ab676SJeff Bonwick 810b24ab676SJeff Bonwick /* 811b24ab676SJeff Bonwick * If we've decided to do a repair, the write is not speculative -- 812b24ab676SJeff Bonwick * even if the original read was. 813b24ab676SJeff Bonwick */ 814b24ab676SJeff Bonwick if (flags & ZIO_FLAG_IO_REPAIR) 815b24ab676SJeff Bonwick flags &= ~ZIO_FLAG_SPECULATIVE; 816b24ab676SJeff Bonwick 817e14bb325SJeff Bonwick zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, 818b24ab676SJeff Bonwick done, private, type, priority, flags, vd, offset, &pio->io_bookmark, 819b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, pipeline); 820fa9e4066Sahrens 821e14bb325SJeff Bonwick return (zio); 82232b87932Sek } 82332b87932Sek 824e14bb325SJeff Bonwick zio_t * 825e14bb325SJeff Bonwick zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, 826b24ab676SJeff Bonwick int type, int priority, enum zio_flag flags, 827b24ab676SJeff Bonwick zio_done_func_t *done, void *private) 828fa9e4066Sahrens { 829e14bb325SJeff Bonwick zio_t *zio; 830fa9e4066Sahrens 831e14bb325SJeff Bonwick ASSERT(vd->vdev_ops->vdev_op_leaf); 832fa9e4066Sahrens 833e14bb325SJeff Bonwick zio = zio_create(NULL, vd->vdev_spa, 0, NULL, 834e14bb325SJeff Bonwick data, size, done, private, type, priority, 835e14bb325SJeff Bonwick flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY, 836e14bb325SJeff Bonwick vd, offset, NULL, 837b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); 838fa9e4066Sahrens 839e14bb325SJeff Bonwick return (zio); 840e05725b1Sbonwick } 841e05725b1Sbonwick 842e05725b1Sbonwick void 843e14bb325SJeff Bonwick zio_flush(zio_t *zio, vdev_t *vd) 844e05725b1Sbonwick { 845e14bb325SJeff Bonwick zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, 846e14bb325SJeff Bonwick NULL, NULL, ZIO_PRIORITY_NOW, 847e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); 848fa9e4066Sahrens } 849fa9e4066Sahrens 850fa9e4066Sahrens /* 851fa9e4066Sahrens * ========================================================================== 852e14bb325SJeff Bonwick * Prepare to read and write logical blocks 853fa9e4066Sahrens * ========================================================================== 854fa9e4066Sahrens */ 855e14bb325SJeff Bonwick 856e05725b1Sbonwick static int 857e14bb325SJeff Bonwick zio_read_bp_init(zio_t *zio) 858fa9e4066Sahrens { 859e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 860e05725b1Sbonwick 86103361682SJeff Bonwick if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && 862f5383399SBill Moore zio->io_child_type == ZIO_CHILD_LOGICAL && 863f5383399SBill Moore !(zio->io_flags & ZIO_FLAG_RAW)) { 864b24ab676SJeff Bonwick uint64_t psize = BP_GET_PSIZE(bp); 865b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(psize); 866e05725b1Sbonwick 867b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, psize, zio_decompress); 868e14bb325SJeff Bonwick } 869fa9e4066Sahrens 870e14bb325SJeff Bonwick if (!dmu_ot[BP_GET_TYPE(bp)].ot_metadata && BP_GET_LEVEL(bp) == 0) 871e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 872fa9e4066Sahrens 873bbfd46c4SJeff Bonwick if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) 874bbfd46c4SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 875bbfd46c4SJeff Bonwick 876b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) 877b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_READ_PIPELINE; 878b24ab676SJeff Bonwick 879e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 880fa9e4066Sahrens } 881fa9e4066Sahrens 882e05725b1Sbonwick static int 883e14bb325SJeff Bonwick zio_write_bp_init(zio_t *zio) 8840a4e9518Sgw { 885b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 886e14bb325SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 887b24ab676SJeff Bonwick enum zio_compress compress = zp->zp_compress; 888e05725b1Sbonwick blkptr_t *bp = zio->io_bp; 889e14bb325SJeff Bonwick uint64_t lsize = zio->io_size; 890b24ab676SJeff Bonwick uint64_t psize = lsize; 891e14bb325SJeff Bonwick int pass = 1; 892e05725b1Sbonwick 893e14bb325SJeff Bonwick /* 894e14bb325SJeff Bonwick * If our children haven't all reached the ready stage, 895e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 896e14bb325SJeff Bonwick */ 897e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 898e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) 899e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 9000a4e9518Sgw 901e14bb325SJeff Bonwick if (!IO_IS_ALLOCATING(zio)) 902e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 9030a4e9518Sgw 904b24ab676SJeff Bonwick ASSERT(zio->io_child_type != ZIO_CHILD_DDT); 905b24ab676SJeff Bonwick 906b24ab676SJeff Bonwick if (zio->io_bp_override) { 907b24ab676SJeff Bonwick ASSERT(bp->blk_birth != zio->io_txg); 908b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); 909b24ab676SJeff Bonwick 910b24ab676SJeff Bonwick *bp = *zio->io_bp_override; 911b24ab676SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 912b24ab676SJeff Bonwick 913b24ab676SJeff Bonwick if (BP_IS_HOLE(bp) || !zp->zp_dedup) 914b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 915b24ab676SJeff Bonwick 916b24ab676SJeff Bonwick ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup || 917b24ab676SJeff Bonwick zp->zp_dedup_verify); 918b24ab676SJeff Bonwick 919b24ab676SJeff Bonwick if (BP_GET_CHECKSUM(bp) == zp->zp_checksum) { 920b24ab676SJeff Bonwick BP_SET_DEDUP(bp, 1); 921b24ab676SJeff Bonwick zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; 922b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 923b24ab676SJeff Bonwick } 924b24ab676SJeff Bonwick zio->io_bp_override = NULL; 925b24ab676SJeff Bonwick BP_ZERO(bp); 926b24ab676SJeff Bonwick } 9270a4e9518Sgw 928e14bb325SJeff Bonwick if (bp->blk_birth == zio->io_txg) { 929e14bb325SJeff Bonwick /* 930e14bb325SJeff Bonwick * We're rewriting an existing block, which means we're 931e14bb325SJeff Bonwick * working on behalf of spa_sync(). For spa_sync() to 932e14bb325SJeff Bonwick * converge, it must eventually be the case that we don't 933e14bb325SJeff Bonwick * have to allocate new blocks. But compression changes 934e14bb325SJeff Bonwick * the blocksize, which forces a reallocate, and makes 935e14bb325SJeff Bonwick * convergence take longer. Therefore, after the first 936e14bb325SJeff Bonwick * few passes, stop compressing to ensure convergence. 937e14bb325SJeff Bonwick */ 938b24ab676SJeff Bonwick pass = spa_sync_pass(spa); 939b24ab676SJeff Bonwick 940b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(spa)); 941b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 942b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp)); 943e05725b1Sbonwick 944e14bb325SJeff Bonwick if (pass > SYNC_PASS_DONT_COMPRESS) 945e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 946e05725b1Sbonwick 947e14bb325SJeff Bonwick /* Make sure someone doesn't change their mind on overwrites */ 948b24ab676SJeff Bonwick ASSERT(MIN(zp->zp_copies + BP_IS_GANG(bp), 949b24ab676SJeff Bonwick spa_max_replication(spa)) == BP_GET_NDVAS(bp)); 950e14bb325SJeff Bonwick } 951fa9e4066Sahrens 952e14bb325SJeff Bonwick if (compress != ZIO_COMPRESS_OFF) { 953b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(lsize); 954b24ab676SJeff Bonwick psize = zio_compress_data(compress, zio->io_data, cbuf, lsize); 955b24ab676SJeff Bonwick if (psize == 0 || psize == lsize) { 956e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 957b24ab676SJeff Bonwick zio_buf_free(cbuf, lsize); 958b24ab676SJeff Bonwick } else { 959b24ab676SJeff Bonwick ASSERT(psize < lsize); 960b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, lsize, NULL); 961e14bb325SJeff Bonwick } 962e14bb325SJeff Bonwick } 963c717a561Smaybee 964e14bb325SJeff Bonwick /* 965e14bb325SJeff Bonwick * The final pass of spa_sync() must be all rewrites, but the first 966e14bb325SJeff Bonwick * few passes offer a trade-off: allocating blocks defers convergence, 967e14bb325SJeff Bonwick * but newly allocated blocks are sequential, so they can be written 968e14bb325SJeff Bonwick * to disk faster. Therefore, we allow the first few passes of 969e14bb325SJeff Bonwick * spa_sync() to allocate new blocks, but force rewrites after that. 970e14bb325SJeff Bonwick * There should only be a handful of blocks after pass 1 in any case. 971e14bb325SJeff Bonwick */ 972b24ab676SJeff Bonwick if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == psize && 973e14bb325SJeff Bonwick pass > SYNC_PASS_REWRITE) { 974b24ab676SJeff Bonwick ASSERT(psize != 0); 975b24ab676SJeff Bonwick enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; 976e14bb325SJeff Bonwick zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; 977e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_REWRITE; 978e14bb325SJeff Bonwick } else { 979e14bb325SJeff Bonwick BP_ZERO(bp); 980e14bb325SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 981e14bb325SJeff Bonwick } 982fa9e4066Sahrens 983b24ab676SJeff Bonwick if (psize == 0) { 984e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 985e14bb325SJeff Bonwick } else { 986e14bb325SJeff Bonwick ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); 987e14bb325SJeff Bonwick BP_SET_LSIZE(bp, lsize); 988b24ab676SJeff Bonwick BP_SET_PSIZE(bp, psize); 989e14bb325SJeff Bonwick BP_SET_COMPRESS(bp, compress); 990e14bb325SJeff Bonwick BP_SET_CHECKSUM(bp, zp->zp_checksum); 991e14bb325SJeff Bonwick BP_SET_TYPE(bp, zp->zp_type); 992e14bb325SJeff Bonwick BP_SET_LEVEL(bp, zp->zp_level); 993b24ab676SJeff Bonwick BP_SET_DEDUP(bp, zp->zp_dedup); 994e14bb325SJeff Bonwick BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 995b24ab676SJeff Bonwick if (zp->zp_dedup) { 996b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 997b24ab676SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 998b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; 999b24ab676SJeff Bonwick } 1000b24ab676SJeff Bonwick } 1001b24ab676SJeff Bonwick 1002b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1003b24ab676SJeff Bonwick } 1004b24ab676SJeff Bonwick 1005b24ab676SJeff Bonwick static int 1006b24ab676SJeff Bonwick zio_free_bp_init(zio_t *zio) 1007b24ab676SJeff Bonwick { 1008b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1009b24ab676SJeff Bonwick 1010b24ab676SJeff Bonwick if (zio->io_child_type == ZIO_CHILD_LOGICAL) { 1011b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp)) 1012b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; 1013b24ab676SJeff Bonwick else 1014b24ab676SJeff Bonwick arc_free(zio->io_spa, bp); 1015e14bb325SJeff Bonwick } 1016fa9e4066Sahrens 1017e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1018fa9e4066Sahrens } 1019fa9e4066Sahrens 1020e14bb325SJeff Bonwick /* 1021e14bb325SJeff Bonwick * ========================================================================== 1022e14bb325SJeff Bonwick * Execute the I/O pipeline 1023e14bb325SJeff Bonwick * ========================================================================== 1024e14bb325SJeff Bonwick */ 1025e14bb325SJeff Bonwick 1026e14bb325SJeff Bonwick static void 1027e14bb325SJeff Bonwick zio_taskq_dispatch(zio_t *zio, enum zio_taskq_type q) 1028fa9e4066Sahrens { 1029*80eb36f2SGeorge Wilson spa_t *spa = zio->io_spa; 1030e14bb325SJeff Bonwick zio_type_t t = zio->io_type; 10310a4e9518Sgw 10320a4e9518Sgw /* 1033bbe36defSGeorge Wilson * If we're a config writer or a probe, the normal issue and 1034bbe36defSGeorge Wilson * interrupt threads may all be blocked waiting for the config lock. 1035bbe36defSGeorge Wilson * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. 10360a4e9518Sgw */ 1037bbe36defSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) 1038e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 10390a4e9518Sgw 10400a4e9518Sgw /* 1041e14bb325SJeff Bonwick * A similar issue exists for the L2ARC write thread until L2ARC 2.0. 10420a4e9518Sgw */ 1043e14bb325SJeff Bonwick if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) 1044e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 10450a4e9518Sgw 1046*80eb36f2SGeorge Wilson /* 1047*80eb36f2SGeorge Wilson * If this is a high priority I/O, then use the high priority taskq. 1048*80eb36f2SGeorge Wilson */ 1049*80eb36f2SGeorge Wilson if (zio->io_priority == ZIO_PRIORITY_NOW && 1050*80eb36f2SGeorge Wilson spa->spa_zio_taskq[t][q + 1] != NULL) 1051*80eb36f2SGeorge Wilson q++; 1052*80eb36f2SGeorge Wilson 1053*80eb36f2SGeorge Wilson ASSERT3U(q, <, ZIO_TASKQ_TYPES); 1054*80eb36f2SGeorge Wilson (void) taskq_dispatch(spa->spa_zio_taskq[t][q], 1055e14bb325SJeff Bonwick (task_func_t *)zio_execute, zio, TQ_SLEEP); 1056e14bb325SJeff Bonwick } 10570a4e9518Sgw 1058e14bb325SJeff Bonwick static boolean_t 1059e14bb325SJeff Bonwick zio_taskq_member(zio_t *zio, enum zio_taskq_type q) 1060e14bb325SJeff Bonwick { 1061e14bb325SJeff Bonwick kthread_t *executor = zio->io_executor; 1062e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 10630a4e9518Sgw 1064e14bb325SJeff Bonwick for (zio_type_t t = 0; t < ZIO_TYPES; t++) 1065e14bb325SJeff Bonwick if (taskq_member(spa->spa_zio_taskq[t][q], executor)) 1066e14bb325SJeff Bonwick return (B_TRUE); 10670a4e9518Sgw 1068e14bb325SJeff Bonwick return (B_FALSE); 1069e14bb325SJeff Bonwick } 1070e05725b1Sbonwick 1071e14bb325SJeff Bonwick static int 1072e14bb325SJeff Bonwick zio_issue_async(zio_t *zio) 1073e14bb325SJeff Bonwick { 1074e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 1075e14bb325SJeff Bonwick 1076e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 10770a4e9518Sgw } 10780a4e9518Sgw 1079e14bb325SJeff Bonwick void 1080e14bb325SJeff Bonwick zio_interrupt(zio_t *zio) 10810a4e9518Sgw { 1082e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT); 1083e14bb325SJeff Bonwick } 10840a4e9518Sgw 1085e14bb325SJeff Bonwick /* 1086e14bb325SJeff Bonwick * Execute the I/O pipeline until one of the following occurs: 1087e14bb325SJeff Bonwick * (1) the I/O completes; (2) the pipeline stalls waiting for 1088e14bb325SJeff Bonwick * dependent child I/Os; (3) the I/O issues, so we're waiting 1089e14bb325SJeff Bonwick * for an I/O completion interrupt; (4) the I/O is delegated by 1090e14bb325SJeff Bonwick * vdev-level caching or aggregation; (5) the I/O is deferred 1091e14bb325SJeff Bonwick * due to vdev-level queueing; (6) the I/O is handed off to 1092e14bb325SJeff Bonwick * another thread. In all cases, the pipeline stops whenever 1093e14bb325SJeff Bonwick * there's no CPU work; it never burns a thread in cv_wait(). 1094e14bb325SJeff Bonwick * 1095e14bb325SJeff Bonwick * There's no locking on io_stage because there's no legitimate way 1096e14bb325SJeff Bonwick * for multiple threads to be attempting to process the same I/O. 1097e14bb325SJeff Bonwick */ 1098b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[]; 10990a4e9518Sgw 1100e14bb325SJeff Bonwick void 1101e14bb325SJeff Bonwick zio_execute(zio_t *zio) 1102e14bb325SJeff Bonwick { 1103e14bb325SJeff Bonwick zio->io_executor = curthread; 11040a4e9518Sgw 1105e14bb325SJeff Bonwick while (zio->io_stage < ZIO_STAGE_DONE) { 1106b24ab676SJeff Bonwick enum zio_stage pipeline = zio->io_pipeline; 1107b24ab676SJeff Bonwick enum zio_stage stage = zio->io_stage; 1108e14bb325SJeff Bonwick int rv; 11090a4e9518Sgw 1110e14bb325SJeff Bonwick ASSERT(!MUTEX_HELD(&zio->io_lock)); 1111b24ab676SJeff Bonwick ASSERT(ISP2(stage)); 1112b24ab676SJeff Bonwick ASSERT(zio->io_stall == NULL); 11130a4e9518Sgw 1114b24ab676SJeff Bonwick do { 1115b24ab676SJeff Bonwick stage <<= 1; 1116b24ab676SJeff Bonwick } while ((stage & pipeline) == 0); 1117e14bb325SJeff Bonwick 1118e14bb325SJeff Bonwick ASSERT(stage <= ZIO_STAGE_DONE); 11190a4e9518Sgw 11200a4e9518Sgw /* 1121e14bb325SJeff Bonwick * If we are in interrupt context and this pipeline stage 1122e14bb325SJeff Bonwick * will grab a config lock that is held across I/O, 1123b24ab676SJeff Bonwick * or may wait for an I/O that needs an interrupt thread 1124b24ab676SJeff Bonwick * to complete, issue async to avoid deadlock. 11250a4e9518Sgw */ 1126b24ab676SJeff Bonwick if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && 1127e14bb325SJeff Bonwick zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { 1128e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 1129e14bb325SJeff Bonwick return; 11300a4e9518Sgw } 11310a4e9518Sgw 1132e14bb325SJeff Bonwick zio->io_stage = stage; 1133b24ab676SJeff Bonwick rv = zio_pipeline[highbit(stage) - 1](zio); 11340a4e9518Sgw 1135e14bb325SJeff Bonwick if (rv == ZIO_PIPELINE_STOP) 1136e14bb325SJeff Bonwick return; 11370a4e9518Sgw 1138e14bb325SJeff Bonwick ASSERT(rv == ZIO_PIPELINE_CONTINUE); 1139e14bb325SJeff Bonwick } 11400a4e9518Sgw } 11410a4e9518Sgw 1142e14bb325SJeff Bonwick /* 1143e14bb325SJeff Bonwick * ========================================================================== 1144e14bb325SJeff Bonwick * Initiate I/O, either sync or async 1145e14bb325SJeff Bonwick * ========================================================================== 1146e14bb325SJeff Bonwick */ 1147e14bb325SJeff Bonwick int 1148e14bb325SJeff Bonwick zio_wait(zio_t *zio) 11490a4e9518Sgw { 1150e14bb325SJeff Bonwick int error; 11510a4e9518Sgw 1152e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 1153e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 11540a4e9518Sgw 1155e14bb325SJeff Bonwick zio->io_waiter = curthread; 1156e05725b1Sbonwick 1157e14bb325SJeff Bonwick zio_execute(zio); 11580a4e9518Sgw 1159e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 1160e14bb325SJeff Bonwick while (zio->io_executor != NULL) 1161e14bb325SJeff Bonwick cv_wait(&zio->io_cv, &zio->io_lock); 1162e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 116332b87932Sek 1164e14bb325SJeff Bonwick error = zio->io_error; 1165e14bb325SJeff Bonwick zio_destroy(zio); 116632b87932Sek 1167e14bb325SJeff Bonwick return (error); 116832b87932Sek } 116932b87932Sek 1170e14bb325SJeff Bonwick void 1171e14bb325SJeff Bonwick zio_nowait(zio_t *zio) 11720a4e9518Sgw { 1173e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 1174fa9e4066Sahrens 1175a3f829aeSBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL && 1176a3f829aeSBill Moore zio_unique_parent(zio) == NULL) { 1177ea8dc4b6Seschrock /* 1178e14bb325SJeff Bonwick * This is a logical async I/O with no parent to wait for it. 117954d692b7SGeorge Wilson * We add it to the spa_async_root_zio "Godfather" I/O which 118054d692b7SGeorge Wilson * will ensure they complete prior to unloading the pool. 1181ea8dc4b6Seschrock */ 1182e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 118354d692b7SGeorge Wilson 118454d692b7SGeorge Wilson zio_add_child(spa->spa_async_zio_root, zio); 1185e14bb325SJeff Bonwick } 1186ea8dc4b6Seschrock 1187e14bb325SJeff Bonwick zio_execute(zio); 1188e14bb325SJeff Bonwick } 1189ea8dc4b6Seschrock 1190e14bb325SJeff Bonwick /* 1191e14bb325SJeff Bonwick * ========================================================================== 1192e14bb325SJeff Bonwick * Reexecute or suspend/resume failed I/O 1193e14bb325SJeff Bonwick * ========================================================================== 1194e14bb325SJeff Bonwick */ 1195fa9e4066Sahrens 1196e14bb325SJeff Bonwick static void 1197e14bb325SJeff Bonwick zio_reexecute(zio_t *pio) 1198e14bb325SJeff Bonwick { 1199a3f829aeSBill Moore zio_t *cio, *cio_next; 1200a3f829aeSBill Moore 1201a3f829aeSBill Moore ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); 1202a3f829aeSBill Moore ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); 1203f5383399SBill Moore ASSERT(pio->io_gang_leader == NULL); 1204f5383399SBill Moore ASSERT(pio->io_gang_tree == NULL); 1205e05725b1Sbonwick 1206e14bb325SJeff Bonwick pio->io_flags = pio->io_orig_flags; 1207e14bb325SJeff Bonwick pio->io_stage = pio->io_orig_stage; 1208e14bb325SJeff Bonwick pio->io_pipeline = pio->io_orig_pipeline; 1209e14bb325SJeff Bonwick pio->io_reexecute = 0; 1210e14bb325SJeff Bonwick pio->io_error = 0; 1211a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1212a3f829aeSBill Moore pio->io_state[w] = 0; 1213e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 1214e14bb325SJeff Bonwick pio->io_child_error[c] = 0; 12150a4e9518Sgw 1216b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(pio)) 1217b24ab676SJeff Bonwick BP_ZERO(pio->io_bp); 1218d58459f4Sek 1219e14bb325SJeff Bonwick /* 1220e14bb325SJeff Bonwick * As we reexecute pio's children, new children could be created. 1221a3f829aeSBill Moore * New children go to the head of pio's io_child_list, however, 1222e14bb325SJeff Bonwick * so we will (correctly) not reexecute them. The key is that 1223a3f829aeSBill Moore * the remainder of pio's io_child_list, from 'cio_next' onward, 1224a3f829aeSBill Moore * cannot be affected by any side effects of reexecuting 'cio'. 1225e14bb325SJeff Bonwick */ 1226a3f829aeSBill Moore for (cio = zio_walk_children(pio); cio != NULL; cio = cio_next) { 1227a3f829aeSBill Moore cio_next = zio_walk_children(pio); 1228e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 1229a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1230a3f829aeSBill Moore pio->io_children[cio->io_child_type][w]++; 1231e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 1232a3f829aeSBill Moore zio_reexecute(cio); 1233fa9e4066Sahrens } 1234e05725b1Sbonwick 1235e14bb325SJeff Bonwick /* 1236e14bb325SJeff Bonwick * Now that all children have been reexecuted, execute the parent. 123754d692b7SGeorge Wilson * We don't reexecute "The Godfather" I/O here as it's the 123854d692b7SGeorge Wilson * responsibility of the caller to wait on him. 1239e14bb325SJeff Bonwick */ 124054d692b7SGeorge Wilson if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) 124154d692b7SGeorge Wilson zio_execute(pio); 12420a4e9518Sgw } 12430a4e9518Sgw 1244e14bb325SJeff Bonwick void 1245e14bb325SJeff Bonwick zio_suspend(spa_t *spa, zio_t *zio) 12460a4e9518Sgw { 1247e14bb325SJeff Bonwick if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) 1248e14bb325SJeff Bonwick fm_panic("Pool '%s' has encountered an uncorrectable I/O " 1249e14bb325SJeff Bonwick "failure and the failure mode property for this pool " 1250e14bb325SJeff Bonwick "is set to panic.", spa_name(spa)); 12510a4e9518Sgw 1252e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); 12530a4e9518Sgw 1254e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1255fa9e4066Sahrens 1256e14bb325SJeff Bonwick if (spa->spa_suspend_zio_root == NULL) 125754d692b7SGeorge Wilson spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, 125854d692b7SGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 125954d692b7SGeorge Wilson ZIO_FLAG_GODFATHER); 1260fa9e4066Sahrens 1261e14bb325SJeff Bonwick spa->spa_suspended = B_TRUE; 1262fa9e4066Sahrens 1263e14bb325SJeff Bonwick if (zio != NULL) { 126454d692b7SGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 1265e14bb325SJeff Bonwick ASSERT(zio != spa->spa_suspend_zio_root); 1266e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1267a3f829aeSBill Moore ASSERT(zio_unique_parent(zio) == NULL); 1268e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_DONE); 1269e14bb325SJeff Bonwick zio_add_child(spa->spa_suspend_zio_root, zio); 1270e14bb325SJeff Bonwick } 1271fa9e4066Sahrens 1272e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1273e14bb325SJeff Bonwick } 1274fa9e4066Sahrens 127554d692b7SGeorge Wilson int 1276e14bb325SJeff Bonwick zio_resume(spa_t *spa) 1277e14bb325SJeff Bonwick { 127854d692b7SGeorge Wilson zio_t *pio; 1279fa9e4066Sahrens 1280b3995adbSahrens /* 1281e14bb325SJeff Bonwick * Reexecute all previously suspended i/o. 1282b3995adbSahrens */ 1283e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1284e14bb325SJeff Bonwick spa->spa_suspended = B_FALSE; 1285e14bb325SJeff Bonwick cv_broadcast(&spa->spa_suspend_cv); 1286e14bb325SJeff Bonwick pio = spa->spa_suspend_zio_root; 1287e14bb325SJeff Bonwick spa->spa_suspend_zio_root = NULL; 1288e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1289e14bb325SJeff Bonwick 1290e14bb325SJeff Bonwick if (pio == NULL) 129154d692b7SGeorge Wilson return (0); 1292e14bb325SJeff Bonwick 129354d692b7SGeorge Wilson zio_reexecute(pio); 129454d692b7SGeorge Wilson return (zio_wait(pio)); 1295e14bb325SJeff Bonwick } 1296e14bb325SJeff Bonwick 1297e14bb325SJeff Bonwick void 1298e14bb325SJeff Bonwick zio_resume_wait(spa_t *spa) 1299e14bb325SJeff Bonwick { 1300e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1301e14bb325SJeff Bonwick while (spa_suspended(spa)) 1302e14bb325SJeff Bonwick cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); 1303e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1304fa9e4066Sahrens } 1305fa9e4066Sahrens 1306fa9e4066Sahrens /* 1307fa9e4066Sahrens * ========================================================================== 1308e14bb325SJeff Bonwick * Gang blocks. 1309e14bb325SJeff Bonwick * 1310e14bb325SJeff Bonwick * A gang block is a collection of small blocks that looks to the DMU 1311e14bb325SJeff Bonwick * like one large block. When zio_dva_allocate() cannot find a block 1312e14bb325SJeff Bonwick * of the requested size, due to either severe fragmentation or the pool 1313e14bb325SJeff Bonwick * being nearly full, it calls zio_write_gang_block() to construct the 1314e14bb325SJeff Bonwick * block from smaller fragments. 1315e14bb325SJeff Bonwick * 1316e14bb325SJeff Bonwick * A gang block consists of a gang header (zio_gbh_phys_t) and up to 1317e14bb325SJeff Bonwick * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like 1318e14bb325SJeff Bonwick * an indirect block: it's an array of block pointers. It consumes 1319e14bb325SJeff Bonwick * only one sector and hence is allocatable regardless of fragmentation. 1320e14bb325SJeff Bonwick * The gang header's bps point to its gang members, which hold the data. 1321e14bb325SJeff Bonwick * 1322e14bb325SJeff Bonwick * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> 1323e14bb325SJeff Bonwick * as the verifier to ensure uniqueness of the SHA256 checksum. 1324e14bb325SJeff Bonwick * Critically, the gang block bp's blk_cksum is the checksum of the data, 1325e14bb325SJeff Bonwick * not the gang header. This ensures that data block signatures (needed for 1326e14bb325SJeff Bonwick * deduplication) are independent of how the block is physically stored. 1327e14bb325SJeff Bonwick * 1328e14bb325SJeff Bonwick * Gang blocks can be nested: a gang member may itself be a gang block. 1329e14bb325SJeff Bonwick * Thus every gang block is a tree in which root and all interior nodes are 1330e14bb325SJeff Bonwick * gang headers, and the leaves are normal blocks that contain user data. 1331e14bb325SJeff Bonwick * The root of the gang tree is called the gang leader. 1332e14bb325SJeff Bonwick * 1333e14bb325SJeff Bonwick * To perform any operation (read, rewrite, free, claim) on a gang block, 1334e14bb325SJeff Bonwick * zio_gang_assemble() first assembles the gang tree (minus data leaves) 1335e14bb325SJeff Bonwick * in the io_gang_tree field of the original logical i/o by recursively 1336e14bb325SJeff Bonwick * reading the gang leader and all gang headers below it. This yields 1337e14bb325SJeff Bonwick * an in-core tree containing the contents of every gang header and the 1338e14bb325SJeff Bonwick * bps for every constituent of the gang block. 1339e14bb325SJeff Bonwick * 1340e14bb325SJeff Bonwick * With the gang tree now assembled, zio_gang_issue() just walks the gang tree 1341e14bb325SJeff Bonwick * and invokes a callback on each bp. To free a gang block, zio_gang_issue() 1342e14bb325SJeff Bonwick * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. 1343e14bb325SJeff Bonwick * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). 1344e14bb325SJeff Bonwick * zio_read_gang() is a wrapper around zio_read() that omits reading gang 1345e14bb325SJeff Bonwick * headers, since we already have those in io_gang_tree. zio_rewrite_gang() 1346e14bb325SJeff Bonwick * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() 1347e14bb325SJeff Bonwick * of the gang header plus zio_checksum_compute() of the data to update the 1348e14bb325SJeff Bonwick * gang header's blk_cksum as described above. 1349e14bb325SJeff Bonwick * 1350e14bb325SJeff Bonwick * The two-phase assemble/issue model solves the problem of partial failure -- 1351e14bb325SJeff Bonwick * what if you'd freed part of a gang block but then couldn't read the 1352e14bb325SJeff Bonwick * gang header for another part? Assembling the entire gang tree first 1353e14bb325SJeff Bonwick * ensures that all the necessary gang header I/O has succeeded before 1354e14bb325SJeff Bonwick * starting the actual work of free, claim, or write. Once the gang tree 1355e14bb325SJeff Bonwick * is assembled, free and claim are in-memory operations that cannot fail. 1356e14bb325SJeff Bonwick * 1357e14bb325SJeff Bonwick * In the event that a gang write fails, zio_dva_unallocate() walks the 1358e14bb325SJeff Bonwick * gang tree to immediately free (i.e. insert back into the space map) 1359e14bb325SJeff Bonwick * everything we've allocated. This ensures that we don't get ENOSPC 1360e14bb325SJeff Bonwick * errors during repeated suspend/resume cycles due to a flaky device. 1361e14bb325SJeff Bonwick * 1362e14bb325SJeff Bonwick * Gang rewrites only happen during sync-to-convergence. If we can't assemble 1363e14bb325SJeff Bonwick * the gang tree, we won't modify the block, so we can safely defer the free 1364e14bb325SJeff Bonwick * (knowing that the block is still intact). If we *can* assemble the gang 1365e14bb325SJeff Bonwick * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free 1366e14bb325SJeff Bonwick * each constituent bp and we can allocate a new block on the next sync pass. 1367e14bb325SJeff Bonwick * 1368e14bb325SJeff Bonwick * In all cases, the gang tree allows complete recovery from partial failure. 1369fa9e4066Sahrens * ========================================================================== 1370fa9e4066Sahrens */ 1371e14bb325SJeff Bonwick 1372e14bb325SJeff Bonwick static zio_t * 1373e14bb325SJeff Bonwick zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1374fa9e4066Sahrens { 1375e14bb325SJeff Bonwick if (gn != NULL) 1376e14bb325SJeff Bonwick return (pio); 1377fa9e4066Sahrens 1378e14bb325SJeff Bonwick return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), 1379e14bb325SJeff Bonwick NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1380e14bb325SJeff Bonwick &pio->io_bookmark)); 1381e14bb325SJeff Bonwick } 1382e14bb325SJeff Bonwick 1383e14bb325SJeff Bonwick zio_t * 1384e14bb325SJeff Bonwick zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1385e14bb325SJeff Bonwick { 1386e14bb325SJeff Bonwick zio_t *zio; 1387e14bb325SJeff Bonwick 1388e14bb325SJeff Bonwick if (gn != NULL) { 1389e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1390e14bb325SJeff Bonwick gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, 1391e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1392fa9e4066Sahrens /* 1393e14bb325SJeff Bonwick * As we rewrite each gang header, the pipeline will compute 1394e14bb325SJeff Bonwick * a new gang block header checksum for it; but no one will 1395e14bb325SJeff Bonwick * compute a new data checksum, so we do that here. The one 1396e14bb325SJeff Bonwick * exception is the gang leader: the pipeline already computed 1397e14bb325SJeff Bonwick * its data checksum because that stage precedes gang assembly. 1398e14bb325SJeff Bonwick * (Presently, nothing actually uses interior data checksums; 1399e14bb325SJeff Bonwick * this is just good hygiene.) 1400fa9e4066Sahrens */ 1401f5383399SBill Moore if (gn != pio->io_gang_leader->io_gang_tree) { 1402e14bb325SJeff Bonwick zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), 1403e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp)); 1404e14bb325SJeff Bonwick } 1405b24ab676SJeff Bonwick /* 1406b24ab676SJeff Bonwick * If we are here to damage data for testing purposes, 1407b24ab676SJeff Bonwick * leave the GBH alone so that we can detect the damage. 1408b24ab676SJeff Bonwick */ 1409b24ab676SJeff Bonwick if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) 1410b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 1411fa9e4066Sahrens } else { 1412e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1413e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, 1414e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1415fa9e4066Sahrens } 1416fa9e4066Sahrens 1417e14bb325SJeff Bonwick return (zio); 1418e14bb325SJeff Bonwick } 1419fa9e4066Sahrens 1420e14bb325SJeff Bonwick /* ARGSUSED */ 1421e14bb325SJeff Bonwick zio_t * 1422e14bb325SJeff Bonwick zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1423e14bb325SJeff Bonwick { 1424b24ab676SJeff Bonwick return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, 1425b24ab676SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio))); 1426fa9e4066Sahrens } 1427fa9e4066Sahrens 1428e14bb325SJeff Bonwick /* ARGSUSED */ 1429e14bb325SJeff Bonwick zio_t * 1430e14bb325SJeff Bonwick zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1431fa9e4066Sahrens { 1432e14bb325SJeff Bonwick return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, 1433e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 1434e14bb325SJeff Bonwick } 1435fa9e4066Sahrens 1436e14bb325SJeff Bonwick static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { 1437e14bb325SJeff Bonwick NULL, 1438e14bb325SJeff Bonwick zio_read_gang, 1439e14bb325SJeff Bonwick zio_rewrite_gang, 1440e14bb325SJeff Bonwick zio_free_gang, 1441e14bb325SJeff Bonwick zio_claim_gang, 1442e14bb325SJeff Bonwick NULL 1443e14bb325SJeff Bonwick }; 1444fa9e4066Sahrens 1445e14bb325SJeff Bonwick static void zio_gang_tree_assemble_done(zio_t *zio); 1446fa9e4066Sahrens 1447e14bb325SJeff Bonwick static zio_gang_node_t * 1448e14bb325SJeff Bonwick zio_gang_node_alloc(zio_gang_node_t **gnpp) 1449e14bb325SJeff Bonwick { 1450e14bb325SJeff Bonwick zio_gang_node_t *gn; 1451fa9e4066Sahrens 1452e14bb325SJeff Bonwick ASSERT(*gnpp == NULL); 1453fa9e4066Sahrens 1454e14bb325SJeff Bonwick gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); 1455e14bb325SJeff Bonwick gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); 1456e14bb325SJeff Bonwick *gnpp = gn; 1457e14bb325SJeff Bonwick 1458e14bb325SJeff Bonwick return (gn); 1459fa9e4066Sahrens } 1460fa9e4066Sahrens 1461fa9e4066Sahrens static void 1462e14bb325SJeff Bonwick zio_gang_node_free(zio_gang_node_t **gnpp) 1463fa9e4066Sahrens { 1464e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1465fa9e4066Sahrens 1466e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1467e14bb325SJeff Bonwick ASSERT(gn->gn_child[g] == NULL); 1468e14bb325SJeff Bonwick 1469e14bb325SJeff Bonwick zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); 1470e14bb325SJeff Bonwick kmem_free(gn, sizeof (*gn)); 1471e14bb325SJeff Bonwick *gnpp = NULL; 1472fa9e4066Sahrens } 1473fa9e4066Sahrens 1474e14bb325SJeff Bonwick static void 1475e14bb325SJeff Bonwick zio_gang_tree_free(zio_gang_node_t **gnpp) 1476fa9e4066Sahrens { 1477e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1478fa9e4066Sahrens 1479e14bb325SJeff Bonwick if (gn == NULL) 1480e14bb325SJeff Bonwick return; 1481fa9e4066Sahrens 1482e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1483e14bb325SJeff Bonwick zio_gang_tree_free(&gn->gn_child[g]); 1484fa9e4066Sahrens 1485e14bb325SJeff Bonwick zio_gang_node_free(gnpp); 1486fa9e4066Sahrens } 1487fa9e4066Sahrens 1488e14bb325SJeff Bonwick static void 1489f5383399SBill Moore zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) 1490fa9e4066Sahrens { 1491e14bb325SJeff Bonwick zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); 1492e14bb325SJeff Bonwick 1493f5383399SBill Moore ASSERT(gio->io_gang_leader == gio); 1494e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp)); 1495fa9e4066Sahrens 1496f5383399SBill Moore zio_nowait(zio_read(gio, gio->io_spa, bp, gn->gn_gbh, 1497e14bb325SJeff Bonwick SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, 1498f5383399SBill Moore gio->io_priority, ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); 1499e14bb325SJeff Bonwick } 1500fa9e4066Sahrens 1501e14bb325SJeff Bonwick static void 1502e14bb325SJeff Bonwick zio_gang_tree_assemble_done(zio_t *zio) 1503e14bb325SJeff Bonwick { 1504f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 1505e14bb325SJeff Bonwick zio_gang_node_t *gn = zio->io_private; 1506e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1507fa9e4066Sahrens 1508f5383399SBill Moore ASSERT(gio == zio_unique_parent(zio)); 1509b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 1510fa9e4066Sahrens 1511e14bb325SJeff Bonwick if (zio->io_error) 1512e14bb325SJeff Bonwick return; 1513fa9e4066Sahrens 1514e14bb325SJeff Bonwick if (BP_SHOULD_BYTESWAP(bp)) 1515e14bb325SJeff Bonwick byteswap_uint64_array(zio->io_data, zio->io_size); 1516fa9e4066Sahrens 1517e14bb325SJeff Bonwick ASSERT(zio->io_data == gn->gn_gbh); 1518e14bb325SJeff Bonwick ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); 1519e14bb325SJeff Bonwick ASSERT(gn->gn_gbh->zg_tail.zbt_magic == ZBT_MAGIC); 1520e05725b1Sbonwick 1521e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1522e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1523e14bb325SJeff Bonwick if (!BP_IS_GANG(gbp)) 1524e14bb325SJeff Bonwick continue; 1525f5383399SBill Moore zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); 1526e14bb325SJeff Bonwick } 1527fa9e4066Sahrens } 1528fa9e4066Sahrens 1529e14bb325SJeff Bonwick static void 1530e14bb325SJeff Bonwick zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) 1531fa9e4066Sahrens { 1532f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1533e14bb325SJeff Bonwick zio_t *zio; 1534fa9e4066Sahrens 1535e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) == !!gn); 1536f5383399SBill Moore ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); 1537f5383399SBill Moore ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); 1538fa9e4066Sahrens 1539e14bb325SJeff Bonwick /* 1540e14bb325SJeff Bonwick * If you're a gang header, your data is in gn->gn_gbh. 1541e14bb325SJeff Bonwick * If you're a gang member, your data is in 'data' and gn == NULL. 1542e14bb325SJeff Bonwick */ 1543f5383399SBill Moore zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data); 1544fa9e4066Sahrens 1545e14bb325SJeff Bonwick if (gn != NULL) { 1546e14bb325SJeff Bonwick ASSERT(gn->gn_gbh->zg_tail.zbt_magic == ZBT_MAGIC); 1547fa9e4066Sahrens 1548e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1549e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1550e14bb325SJeff Bonwick if (BP_IS_HOLE(gbp)) 1551e14bb325SJeff Bonwick continue; 1552e14bb325SJeff Bonwick zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); 1553e14bb325SJeff Bonwick data = (char *)data + BP_GET_PSIZE(gbp); 1554e14bb325SJeff Bonwick } 1555fa9e4066Sahrens } 1556fa9e4066Sahrens 1557f5383399SBill Moore if (gn == gio->io_gang_tree) 1558f5383399SBill Moore ASSERT3P((char *)gio->io_data + gio->io_size, ==, data); 1559e05725b1Sbonwick 1560e14bb325SJeff Bonwick if (zio != pio) 1561e14bb325SJeff Bonwick zio_nowait(zio); 1562fa9e4066Sahrens } 1563fa9e4066Sahrens 1564e05725b1Sbonwick static int 1565e14bb325SJeff Bonwick zio_gang_assemble(zio_t *zio) 1566fa9e4066Sahrens { 1567e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1568fa9e4066Sahrens 1569f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); 1570f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1571f5383399SBill Moore 1572f5383399SBill Moore zio->io_gang_leader = zio; 1573fa9e4066Sahrens 1574e14bb325SJeff Bonwick zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); 1575e05725b1Sbonwick 1576e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1577fa9e4066Sahrens } 1578fa9e4066Sahrens 1579e05725b1Sbonwick static int 1580e14bb325SJeff Bonwick zio_gang_issue(zio_t *zio) 1581fa9e4066Sahrens { 1582e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1583fa9e4066Sahrens 1584e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) 1585e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1586fa9e4066Sahrens 1587f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); 1588f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1589fa9e4066Sahrens 1590e14bb325SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_GANG] == 0) 1591f5383399SBill Moore zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_data); 1592e14bb325SJeff Bonwick else 1593f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 1594fa9e4066Sahrens 1595e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1596e05725b1Sbonwick 1597e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1598fa9e4066Sahrens } 1599fa9e4066Sahrens 1600fa9e4066Sahrens static void 1601e14bb325SJeff Bonwick zio_write_gang_member_ready(zio_t *zio) 1602fa9e4066Sahrens { 1603a3f829aeSBill Moore zio_t *pio = zio_unique_parent(zio); 1604f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 160544cd46caSbillm dva_t *cdva = zio->io_bp->blk_dva; 160644cd46caSbillm dva_t *pdva = pio->io_bp->blk_dva; 1607fa9e4066Sahrens uint64_t asize; 1608fa9e4066Sahrens 1609e14bb325SJeff Bonwick if (BP_IS_HOLE(zio->io_bp)) 1610e14bb325SJeff Bonwick return; 1611e14bb325SJeff Bonwick 1612e14bb325SJeff Bonwick ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); 1613e14bb325SJeff Bonwick 1614e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_GANG); 1615b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); 1616b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); 1617b24ab676SJeff Bonwick ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); 161844cd46caSbillm ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); 1619fa9e4066Sahrens 1620fa9e4066Sahrens mutex_enter(&pio->io_lock); 1621e14bb325SJeff Bonwick for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { 162244cd46caSbillm ASSERT(DVA_GET_GANG(&pdva[d])); 162344cd46caSbillm asize = DVA_GET_ASIZE(&pdva[d]); 162444cd46caSbillm asize += DVA_GET_ASIZE(&cdva[d]); 162544cd46caSbillm DVA_SET_ASIZE(&pdva[d], asize); 162644cd46caSbillm } 1627fa9e4066Sahrens mutex_exit(&pio->io_lock); 1628fa9e4066Sahrens } 1629fa9e4066Sahrens 16300a4e9518Sgw static int 1631e14bb325SJeff Bonwick zio_write_gang_block(zio_t *pio) 1632fa9e4066Sahrens { 1633e14bb325SJeff Bonwick spa_t *spa = pio->io_spa; 1634e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 1635f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1636e14bb325SJeff Bonwick zio_t *zio; 1637e14bb325SJeff Bonwick zio_gang_node_t *gn, **gnpp; 1638fa9e4066Sahrens zio_gbh_phys_t *gbh; 1639e14bb325SJeff Bonwick uint64_t txg = pio->io_txg; 1640e14bb325SJeff Bonwick uint64_t resid = pio->io_size; 1641e14bb325SJeff Bonwick uint64_t lsize; 1642b24ab676SJeff Bonwick int copies = gio->io_prop.zp_copies; 1643b24ab676SJeff Bonwick int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); 1644e14bb325SJeff Bonwick zio_prop_t zp; 1645fa9e4066Sahrens int error; 1646fa9e4066Sahrens 1647b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), SPA_GANGBLOCKSIZE, 1648b24ab676SJeff Bonwick bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, 1649e14bb325SJeff Bonwick METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); 1650e05725b1Sbonwick if (error) { 1651e14bb325SJeff Bonwick pio->io_error = error; 1652e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1653e05725b1Sbonwick } 1654fa9e4066Sahrens 1655f5383399SBill Moore if (pio == gio) { 1656f5383399SBill Moore gnpp = &gio->io_gang_tree; 1657e14bb325SJeff Bonwick } else { 1658e14bb325SJeff Bonwick gnpp = pio->io_private; 1659e14bb325SJeff Bonwick ASSERT(pio->io_ready == zio_write_gang_member_ready); 1660fa9e4066Sahrens } 1661fa9e4066Sahrens 1662e14bb325SJeff Bonwick gn = zio_gang_node_alloc(gnpp); 1663e14bb325SJeff Bonwick gbh = gn->gn_gbh; 1664e14bb325SJeff Bonwick bzero(gbh, SPA_GANGBLOCKSIZE); 1665fa9e4066Sahrens 1666e14bb325SJeff Bonwick /* 1667e14bb325SJeff Bonwick * Create the gang header. 1668e14bb325SJeff Bonwick */ 1669e14bb325SJeff Bonwick zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, 1670e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1671fa9e4066Sahrens 1672e14bb325SJeff Bonwick /* 1673e14bb325SJeff Bonwick * Create and nowait the gang children. 1674e14bb325SJeff Bonwick */ 1675e14bb325SJeff Bonwick for (int g = 0; resid != 0; resid -= lsize, g++) { 1676e14bb325SJeff Bonwick lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), 1677e14bb325SJeff Bonwick SPA_MINBLOCKSIZE); 1678e14bb325SJeff Bonwick ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); 1679e14bb325SJeff Bonwick 1680f5383399SBill Moore zp.zp_checksum = gio->io_prop.zp_checksum; 1681e14bb325SJeff Bonwick zp.zp_compress = ZIO_COMPRESS_OFF; 1682e14bb325SJeff Bonwick zp.zp_type = DMU_OT_NONE; 1683e14bb325SJeff Bonwick zp.zp_level = 0; 1684b24ab676SJeff Bonwick zp.zp_copies = gio->io_prop.zp_copies; 1685b24ab676SJeff Bonwick zp.zp_dedup = 0; 1686b24ab676SJeff Bonwick zp.zp_dedup_verify = 0; 1687e14bb325SJeff Bonwick 1688e14bb325SJeff Bonwick zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], 1689e14bb325SJeff Bonwick (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, 1690e14bb325SJeff Bonwick zio_write_gang_member_ready, NULL, &gn->gn_child[g], 1691e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1692e14bb325SJeff Bonwick &pio->io_bookmark)); 1693e14bb325SJeff Bonwick } 1694e05725b1Sbonwick 169544cd46caSbillm /* 1696e14bb325SJeff Bonwick * Set pio's pipeline to just wait for zio to finish. 169744cd46caSbillm */ 1698e14bb325SJeff Bonwick pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1699e14bb325SJeff Bonwick 1700e14bb325SJeff Bonwick zio_nowait(zio); 1701e14bb325SJeff Bonwick 1702e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1703fa9e4066Sahrens } 1704fa9e4066Sahrens 1705fa9e4066Sahrens /* 1706fa9e4066Sahrens * ========================================================================== 1707b24ab676SJeff Bonwick * Dedup 1708fa9e4066Sahrens * ========================================================================== 1709fa9e4066Sahrens */ 1710b24ab676SJeff Bonwick static void 1711b24ab676SJeff Bonwick zio_ddt_child_read_done(zio_t *zio) 1712b24ab676SJeff Bonwick { 1713b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1714b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1715b24ab676SJeff Bonwick ddt_phys_t *ddp; 1716b24ab676SJeff Bonwick zio_t *pio = zio_unique_parent(zio); 1717b24ab676SJeff Bonwick 1718b24ab676SJeff Bonwick mutex_enter(&pio->io_lock); 1719b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 1720b24ab676SJeff Bonwick if (zio->io_error == 0) 1721b24ab676SJeff Bonwick ddt_phys_clear(ddp); /* this ddp doesn't need repair */ 1722b24ab676SJeff Bonwick if (zio->io_error == 0 && dde->dde_repair_data == NULL) 1723b24ab676SJeff Bonwick dde->dde_repair_data = zio->io_data; 1724b24ab676SJeff Bonwick else 1725b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zio->io_size); 1726b24ab676SJeff Bonwick mutex_exit(&pio->io_lock); 1727b24ab676SJeff Bonwick } 1728b24ab676SJeff Bonwick 1729b24ab676SJeff Bonwick static int 1730b24ab676SJeff Bonwick zio_ddt_read_start(zio_t *zio) 1731b24ab676SJeff Bonwick { 1732b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1733b24ab676SJeff Bonwick 1734b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1735b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1736b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1737b24ab676SJeff Bonwick 1738b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1739b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1740b24ab676SJeff Bonwick ddt_entry_t *dde = ddt_repair_start(ddt, bp); 1741b24ab676SJeff Bonwick ddt_phys_t *ddp = dde->dde_phys; 1742b24ab676SJeff Bonwick ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); 1743b24ab676SJeff Bonwick blkptr_t blk; 1744b24ab676SJeff Bonwick 1745b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1746b24ab676SJeff Bonwick zio->io_vsd = dde; 1747b24ab676SJeff Bonwick 1748b24ab676SJeff Bonwick if (ddp_self == NULL) 1749b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1750b24ab676SJeff Bonwick 1751b24ab676SJeff Bonwick for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { 1752b24ab676SJeff Bonwick if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) 1753b24ab676SJeff Bonwick continue; 1754bbfd46c4SJeff Bonwick ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, 1755bbfd46c4SJeff Bonwick &blk); 1756b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, &blk, 1757b24ab676SJeff Bonwick zio_buf_alloc(zio->io_size), zio->io_size, 1758b24ab676SJeff Bonwick zio_ddt_child_read_done, dde, zio->io_priority, 1759b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio) | ZIO_FLAG_DONT_PROPAGATE, 1760b24ab676SJeff Bonwick &zio->io_bookmark)); 1761b24ab676SJeff Bonwick } 1762b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1763b24ab676SJeff Bonwick } 1764b24ab676SJeff Bonwick 1765b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, bp, 1766b24ab676SJeff Bonwick zio->io_data, zio->io_size, NULL, NULL, zio->io_priority, 1767b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); 1768b24ab676SJeff Bonwick 1769b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1770b24ab676SJeff Bonwick } 1771e14bb325SJeff Bonwick 1772b24ab676SJeff Bonwick static int 1773b24ab676SJeff Bonwick zio_ddt_read_done(zio_t *zio) 1774b24ab676SJeff Bonwick { 1775b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1776b24ab676SJeff Bonwick 1777b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE)) 1778b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 1779b24ab676SJeff Bonwick 1780b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1781b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1782b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1783b24ab676SJeff Bonwick 1784b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1785b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1786b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_vsd; 1787b24ab676SJeff Bonwick if (ddt == NULL) { 1788b24ab676SJeff Bonwick ASSERT(zio->io_spa->spa_load_state != SPA_LOAD_NONE); 1789b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1790b24ab676SJeff Bonwick } 1791b24ab676SJeff Bonwick if (dde == NULL) { 1792b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; 1793b24ab676SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 1794b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 1795b24ab676SJeff Bonwick } 1796b24ab676SJeff Bonwick if (dde->dde_repair_data != NULL) { 1797b24ab676SJeff Bonwick bcopy(dde->dde_repair_data, zio->io_data, zio->io_size); 1798b24ab676SJeff Bonwick zio->io_child_error[ZIO_CHILD_DDT] = 0; 1799b24ab676SJeff Bonwick } 1800b24ab676SJeff Bonwick ddt_repair_done(ddt, dde); 1801b24ab676SJeff Bonwick zio->io_vsd = NULL; 1802b24ab676SJeff Bonwick } 1803b24ab676SJeff Bonwick 1804b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1805b24ab676SJeff Bonwick 1806b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1807b24ab676SJeff Bonwick } 1808b24ab676SJeff Bonwick 1809b24ab676SJeff Bonwick static boolean_t 1810b24ab676SJeff Bonwick zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) 1811b24ab676SJeff Bonwick { 1812b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 1813b24ab676SJeff Bonwick 1814b24ab676SJeff Bonwick /* 1815b24ab676SJeff Bonwick * Note: we compare the original data, not the transformed data, 1816b24ab676SJeff Bonwick * because when zio->io_bp is an override bp, we will not have 1817b24ab676SJeff Bonwick * pushed the I/O transforms. That's an important optimization 1818b24ab676SJeff Bonwick * because otherwise we'd compress/encrypt all dmu_sync() data twice. 1819b24ab676SJeff Bonwick */ 1820b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 1821b24ab676SJeff Bonwick zio_t *lio = dde->dde_lead_zio[p]; 1822b24ab676SJeff Bonwick 1823b24ab676SJeff Bonwick if (lio != NULL) { 1824b24ab676SJeff Bonwick return (lio->io_orig_size != zio->io_orig_size || 1825b24ab676SJeff Bonwick bcmp(zio->io_orig_data, lio->io_orig_data, 1826b24ab676SJeff Bonwick zio->io_orig_size) != 0); 1827b24ab676SJeff Bonwick } 1828b24ab676SJeff Bonwick } 1829b24ab676SJeff Bonwick 1830b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 1831b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1832b24ab676SJeff Bonwick 1833b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) { 1834b24ab676SJeff Bonwick arc_buf_t *abuf = NULL; 1835b24ab676SJeff Bonwick uint32_t aflags = ARC_WAIT; 1836b24ab676SJeff Bonwick blkptr_t blk = *zio->io_bp; 1837b24ab676SJeff Bonwick int error; 1838b24ab676SJeff Bonwick 1839b24ab676SJeff Bonwick ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); 1840b24ab676SJeff Bonwick 1841b24ab676SJeff Bonwick ddt_exit(ddt); 1842b24ab676SJeff Bonwick 1843b24ab676SJeff Bonwick error = arc_read_nolock(NULL, spa, &blk, 1844b24ab676SJeff Bonwick arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, 1845b24ab676SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 1846b24ab676SJeff Bonwick &aflags, &zio->io_bookmark); 1847b24ab676SJeff Bonwick 1848b24ab676SJeff Bonwick if (error == 0) { 1849b24ab676SJeff Bonwick if (arc_buf_size(abuf) != zio->io_orig_size || 1850b24ab676SJeff Bonwick bcmp(abuf->b_data, zio->io_orig_data, 1851b24ab676SJeff Bonwick zio->io_orig_size) != 0) 1852b24ab676SJeff Bonwick error = EEXIST; 1853b24ab676SJeff Bonwick VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 1854b24ab676SJeff Bonwick } 1855b24ab676SJeff Bonwick 1856b24ab676SJeff Bonwick ddt_enter(ddt); 1857b24ab676SJeff Bonwick return (error != 0); 1858b24ab676SJeff Bonwick } 1859b24ab676SJeff Bonwick } 1860b24ab676SJeff Bonwick 1861b24ab676SJeff Bonwick return (B_FALSE); 1862b24ab676SJeff Bonwick } 1863b24ab676SJeff Bonwick 1864b24ab676SJeff Bonwick static void 1865b24ab676SJeff Bonwick zio_ddt_child_write_ready(zio_t *zio) 1866b24ab676SJeff Bonwick { 1867b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 1868b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 1869b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1870b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1871b24ab676SJeff Bonwick zio_t *pio; 1872b24ab676SJeff Bonwick 1873b24ab676SJeff Bonwick if (zio->io_error) 1874b24ab676SJeff Bonwick return; 1875b24ab676SJeff Bonwick 1876b24ab676SJeff Bonwick ddt_enter(ddt); 1877b24ab676SJeff Bonwick 1878b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1879b24ab676SJeff Bonwick 1880b24ab676SJeff Bonwick ddt_phys_fill(ddp, zio->io_bp); 1881b24ab676SJeff Bonwick 1882b24ab676SJeff Bonwick while ((pio = zio_walk_parents(zio)) != NULL) 1883b24ab676SJeff Bonwick ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); 1884b24ab676SJeff Bonwick 1885b24ab676SJeff Bonwick ddt_exit(ddt); 1886b24ab676SJeff Bonwick } 1887b24ab676SJeff Bonwick 1888b24ab676SJeff Bonwick static void 1889b24ab676SJeff Bonwick zio_ddt_child_write_done(zio_t *zio) 1890b24ab676SJeff Bonwick { 1891b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 1892b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 1893b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1894b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1895b24ab676SJeff Bonwick 1896b24ab676SJeff Bonwick ddt_enter(ddt); 1897b24ab676SJeff Bonwick 1898b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 1899b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1900b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 1901b24ab676SJeff Bonwick 1902b24ab676SJeff Bonwick if (zio->io_error == 0) { 1903b24ab676SJeff Bonwick while (zio_walk_parents(zio) != NULL) 1904b24ab676SJeff Bonwick ddt_phys_addref(ddp); 1905b24ab676SJeff Bonwick } else { 1906b24ab676SJeff Bonwick ddt_phys_clear(ddp); 1907b24ab676SJeff Bonwick } 1908b24ab676SJeff Bonwick 1909b24ab676SJeff Bonwick ddt_exit(ddt); 1910b24ab676SJeff Bonwick } 1911b24ab676SJeff Bonwick 1912b24ab676SJeff Bonwick static void 1913b24ab676SJeff Bonwick zio_ddt_ditto_write_done(zio_t *zio) 1914b24ab676SJeff Bonwick { 1915b24ab676SJeff Bonwick int p = DDT_PHYS_DITTO; 1916b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 1917b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1918b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1919b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1920b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1921b24ab676SJeff Bonwick ddt_key_t *ddk = &dde->dde_key; 1922b24ab676SJeff Bonwick 1923b24ab676SJeff Bonwick ddt_enter(ddt); 1924b24ab676SJeff Bonwick 1925b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 1926b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1927b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 1928b24ab676SJeff Bonwick 1929b24ab676SJeff Bonwick if (zio->io_error == 0) { 1930b24ab676SJeff Bonwick ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); 1931b24ab676SJeff Bonwick ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); 1932b24ab676SJeff Bonwick ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); 1933b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 1934b24ab676SJeff Bonwick ddt_phys_free(ddt, ddk, ddp, zio->io_txg); 1935b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 1936b24ab676SJeff Bonwick } 1937b24ab676SJeff Bonwick 1938b24ab676SJeff Bonwick ddt_exit(ddt); 1939b24ab676SJeff Bonwick } 1940b24ab676SJeff Bonwick 1941b24ab676SJeff Bonwick static int 1942b24ab676SJeff Bonwick zio_ddt_write(zio_t *zio) 1943b24ab676SJeff Bonwick { 1944b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 1945b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1946b24ab676SJeff Bonwick uint64_t txg = zio->io_txg; 1947b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 1948b24ab676SJeff Bonwick int p = zp->zp_copies; 1949b24ab676SJeff Bonwick int ditto_copies; 1950b24ab676SJeff Bonwick zio_t *cio = NULL; 1951b24ab676SJeff Bonwick zio_t *dio = NULL; 1952b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 1953b24ab676SJeff Bonwick ddt_entry_t *dde; 1954b24ab676SJeff Bonwick ddt_phys_t *ddp; 1955b24ab676SJeff Bonwick 1956b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1957b24ab676SJeff Bonwick ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); 1958b24ab676SJeff Bonwick ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); 1959b24ab676SJeff Bonwick 1960b24ab676SJeff Bonwick ddt_enter(ddt); 1961b24ab676SJeff Bonwick dde = ddt_lookup(ddt, bp, B_TRUE); 1962b24ab676SJeff Bonwick ddp = &dde->dde_phys[p]; 1963b24ab676SJeff Bonwick 1964b24ab676SJeff Bonwick if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { 1965b24ab676SJeff Bonwick /* 1966b24ab676SJeff Bonwick * If we're using a weak checksum, upgrade to a strong checksum 1967b24ab676SJeff Bonwick * and try again. If we're already using a strong checksum, 1968b24ab676SJeff Bonwick * we can't resolve it, so just convert to an ordinary write. 1969b24ab676SJeff Bonwick * (And automatically e-mail a paper to Nature?) 1970b24ab676SJeff Bonwick */ 1971b24ab676SJeff Bonwick if (!zio_checksum_table[zp->zp_checksum].ci_dedup) { 1972b24ab676SJeff Bonwick zp->zp_checksum = spa_dedup_checksum(spa); 1973b24ab676SJeff Bonwick zio_pop_transforms(zio); 1974b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 1975b24ab676SJeff Bonwick BP_ZERO(bp); 1976b24ab676SJeff Bonwick } else { 1977b24ab676SJeff Bonwick zp->zp_dedup = 0; 1978b24ab676SJeff Bonwick } 1979b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 1980b24ab676SJeff Bonwick ddt_exit(ddt); 1981b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1982b24ab676SJeff Bonwick } 1983b24ab676SJeff Bonwick 1984b24ab676SJeff Bonwick ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); 1985b24ab676SJeff Bonwick ASSERT(ditto_copies < SPA_DVAS_PER_BP); 1986b24ab676SJeff Bonwick 1987b24ab676SJeff Bonwick if (ditto_copies > ddt_ditto_copies_present(dde) && 1988b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { 1989b24ab676SJeff Bonwick zio_prop_t czp = *zp; 1990b24ab676SJeff Bonwick 1991b24ab676SJeff Bonwick czp.zp_copies = ditto_copies; 1992b24ab676SJeff Bonwick 1993b24ab676SJeff Bonwick /* 1994b24ab676SJeff Bonwick * If we arrived here with an override bp, we won't have run 1995b24ab676SJeff Bonwick * the transform stack, so we won't have the data we need to 1996b24ab676SJeff Bonwick * generate a child i/o. So, toss the override bp and restart. 1997b24ab676SJeff Bonwick * This is safe, because using the override bp is just an 1998b24ab676SJeff Bonwick * optimization; and it's rare, so the cost doesn't matter. 1999b24ab676SJeff Bonwick */ 2000b24ab676SJeff Bonwick if (zio->io_bp_override) { 2001b24ab676SJeff Bonwick zio_pop_transforms(zio); 2002b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2003b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2004b24ab676SJeff Bonwick zio->io_bp_override = NULL; 2005b24ab676SJeff Bonwick BP_ZERO(bp); 2006b24ab676SJeff Bonwick ddt_exit(ddt); 2007b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2008b24ab676SJeff Bonwick } 2009b24ab676SJeff Bonwick 2010b24ab676SJeff Bonwick dio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 2011b24ab676SJeff Bonwick zio->io_orig_size, &czp, NULL, 2012b24ab676SJeff Bonwick zio_ddt_ditto_write_done, dde, zio->io_priority, 2013b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2014b24ab676SJeff Bonwick 2015b24ab676SJeff Bonwick zio_push_transform(dio, zio->io_data, zio->io_size, 0, NULL); 2016b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; 2017b24ab676SJeff Bonwick } 2018b24ab676SJeff Bonwick 2019b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { 2020b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2021b24ab676SJeff Bonwick ddt_bp_fill(ddp, bp, txg); 2022b24ab676SJeff Bonwick if (dde->dde_lead_zio[p] != NULL) 2023b24ab676SJeff Bonwick zio_add_child(zio, dde->dde_lead_zio[p]); 2024b24ab676SJeff Bonwick else 2025b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2026b24ab676SJeff Bonwick } else if (zio->io_bp_override) { 2027b24ab676SJeff Bonwick ASSERT(bp->blk_birth == txg); 2028b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, zio->io_bp_override)); 2029b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2030b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2031b24ab676SJeff Bonwick } else { 2032b24ab676SJeff Bonwick cio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 2033b24ab676SJeff Bonwick zio->io_orig_size, zp, zio_ddt_child_write_ready, 2034b24ab676SJeff Bonwick zio_ddt_child_write_done, dde, zio->io_priority, 2035b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2036b24ab676SJeff Bonwick 2037b24ab676SJeff Bonwick zio_push_transform(cio, zio->io_data, zio->io_size, 0, NULL); 2038b24ab676SJeff Bonwick dde->dde_lead_zio[p] = cio; 2039b24ab676SJeff Bonwick } 2040b24ab676SJeff Bonwick 2041b24ab676SJeff Bonwick ddt_exit(ddt); 2042b24ab676SJeff Bonwick 2043b24ab676SJeff Bonwick if (cio) 2044b24ab676SJeff Bonwick zio_nowait(cio); 2045b24ab676SJeff Bonwick if (dio) 2046b24ab676SJeff Bonwick zio_nowait(dio); 2047b24ab676SJeff Bonwick 2048b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2049b24ab676SJeff Bonwick } 2050b24ab676SJeff Bonwick 2051b24ab676SJeff Bonwick static int 2052b24ab676SJeff Bonwick zio_ddt_free(zio_t *zio) 2053b24ab676SJeff Bonwick { 2054b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2055b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2056b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2057b24ab676SJeff Bonwick ddt_entry_t *dde; 2058b24ab676SJeff Bonwick ddt_phys_t *ddp; 2059b24ab676SJeff Bonwick 2060b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2061b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2062b24ab676SJeff Bonwick 2063b24ab676SJeff Bonwick ddt_enter(ddt); 2064b24ab676SJeff Bonwick dde = ddt_lookup(ddt, bp, B_TRUE); 2065b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 2066b24ab676SJeff Bonwick ddt_phys_decref(ddp); 2067b24ab676SJeff Bonwick ddt_exit(ddt); 2068b24ab676SJeff Bonwick 2069b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2070b24ab676SJeff Bonwick } 2071b24ab676SJeff Bonwick 2072b24ab676SJeff Bonwick /* 2073b24ab676SJeff Bonwick * ========================================================================== 2074b24ab676SJeff Bonwick * Allocate and free blocks 2075b24ab676SJeff Bonwick * ========================================================================== 2076b24ab676SJeff Bonwick */ 2077e05725b1Sbonwick static int 2078fa9e4066Sahrens zio_dva_allocate(zio_t *zio) 2079fa9e4066Sahrens { 20808654d025Sperrin spa_t *spa = zio->io_spa; 2081b24ab676SJeff Bonwick metaslab_class_t *mc = spa_normal_class(spa); 2082fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2083fa9e4066Sahrens int error; 2084fa9e4066Sahrens 2085f5383399SBill Moore if (zio->io_gang_leader == NULL) { 2086f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 2087f5383399SBill Moore zio->io_gang_leader = zio; 2088f5383399SBill Moore } 2089f5383399SBill Moore 2090fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 209144cd46caSbillm ASSERT3U(BP_GET_NDVAS(bp), ==, 0); 2092b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, >, 0); 2093b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); 2094fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 2095fa9e4066Sahrens 2096e14bb325SJeff Bonwick error = metaslab_alloc(spa, mc, zio->io_size, bp, 2097b24ab676SJeff Bonwick zio->io_prop.zp_copies, zio->io_txg, NULL, 0); 2098fa9e4066Sahrens 2099e14bb325SJeff Bonwick if (error) { 2100e14bb325SJeff Bonwick if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) 2101e14bb325SJeff Bonwick return (zio_write_gang_block(zio)); 2102fa9e4066Sahrens zio->io_error = error; 2103fa9e4066Sahrens } 2104e05725b1Sbonwick 2105e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2106fa9e4066Sahrens } 2107fa9e4066Sahrens 2108e05725b1Sbonwick static int 2109fa9e4066Sahrens zio_dva_free(zio_t *zio) 2110fa9e4066Sahrens { 2111e14bb325SJeff Bonwick metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); 2112fa9e4066Sahrens 2113e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2114fa9e4066Sahrens } 2115fa9e4066Sahrens 2116e05725b1Sbonwick static int 2117fa9e4066Sahrens zio_dva_claim(zio_t *zio) 2118fa9e4066Sahrens { 2119e14bb325SJeff Bonwick int error; 2120e14bb325SJeff Bonwick 2121e14bb325SJeff Bonwick error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); 2122e14bb325SJeff Bonwick if (error) 2123e14bb325SJeff Bonwick zio->io_error = error; 2124fa9e4066Sahrens 2125e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2126fa9e4066Sahrens } 2127fa9e4066Sahrens 2128e14bb325SJeff Bonwick /* 2129e14bb325SJeff Bonwick * Undo an allocation. This is used by zio_done() when an I/O fails 2130e14bb325SJeff Bonwick * and we want to give back the block we just allocated. 2131e14bb325SJeff Bonwick * This handles both normal blocks and gang blocks. 2132e14bb325SJeff Bonwick */ 2133e14bb325SJeff Bonwick static void 2134e14bb325SJeff Bonwick zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) 2135e14bb325SJeff Bonwick { 2136e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2137b24ab676SJeff Bonwick ASSERT(zio->io_bp_override == NULL); 2138e14bb325SJeff Bonwick 2139e14bb325SJeff Bonwick if (!BP_IS_HOLE(bp)) 2140b24ab676SJeff Bonwick metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); 2141e14bb325SJeff Bonwick 2142e14bb325SJeff Bonwick if (gn != NULL) { 2143e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 2144e14bb325SJeff Bonwick zio_dva_unallocate(zio, gn->gn_child[g], 2145e14bb325SJeff Bonwick &gn->gn_gbh->zg_blkptr[g]); 2146e14bb325SJeff Bonwick } 2147e14bb325SJeff Bonwick } 2148e14bb325SJeff Bonwick } 2149e14bb325SJeff Bonwick 2150e14bb325SJeff Bonwick /* 2151e14bb325SJeff Bonwick * Try to allocate an intent log block. Return 0 on success, errno on failure. 2152e14bb325SJeff Bonwick */ 2153e14bb325SJeff Bonwick int 2154b24ab676SJeff Bonwick zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, blkptr_t *old_bp, 2155b24ab676SJeff Bonwick uint64_t size, boolean_t use_slog) 2156e14bb325SJeff Bonwick { 2157e09fa4daSNeil Perrin int error = 1; 2158e14bb325SJeff Bonwick 2159b24ab676SJeff Bonwick ASSERT(txg > spa_syncing_txg(spa)); 2160b24ab676SJeff Bonwick 2161d48e086fSNeil Perrin if (use_slog) 2162b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_log_class(spa), size, 2163e09fa4daSNeil Perrin new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); 2164e14bb325SJeff Bonwick 2165e14bb325SJeff Bonwick if (error) 2166b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), size, 2167e14bb325SJeff Bonwick new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); 2168e14bb325SJeff Bonwick 2169e14bb325SJeff Bonwick if (error == 0) { 2170e14bb325SJeff Bonwick BP_SET_LSIZE(new_bp, size); 2171e14bb325SJeff Bonwick BP_SET_PSIZE(new_bp, size); 2172e14bb325SJeff Bonwick BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); 2173e14bb325SJeff Bonwick BP_SET_CHECKSUM(new_bp, ZIO_CHECKSUM_ZILOG); 2174e14bb325SJeff Bonwick BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 2175e14bb325SJeff Bonwick BP_SET_LEVEL(new_bp, 0); 2176b24ab676SJeff Bonwick BP_SET_DEDUP(new_bp, 0); 2177e14bb325SJeff Bonwick BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); 2178e14bb325SJeff Bonwick } 2179e14bb325SJeff Bonwick 2180e14bb325SJeff Bonwick return (error); 2181e14bb325SJeff Bonwick } 2182e14bb325SJeff Bonwick 2183e14bb325SJeff Bonwick /* 2184b24ab676SJeff Bonwick * Free an intent log block. 2185e14bb325SJeff Bonwick */ 2186e14bb325SJeff Bonwick void 2187b24ab676SJeff Bonwick zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp) 2188e14bb325SJeff Bonwick { 2189b24ab676SJeff Bonwick ASSERT(BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG); 2190e14bb325SJeff Bonwick ASSERT(!BP_IS_GANG(bp)); 2191e14bb325SJeff Bonwick 2192b24ab676SJeff Bonwick zio_free(spa, txg, bp); 2193e14bb325SJeff Bonwick } 2194e14bb325SJeff Bonwick 2195fa9e4066Sahrens /* 2196fa9e4066Sahrens * ========================================================================== 2197fa9e4066Sahrens * Read and write to physical devices 2198fa9e4066Sahrens * ========================================================================== 2199fa9e4066Sahrens */ 2200e05725b1Sbonwick static int 220144cd46caSbillm zio_vdev_io_start(zio_t *zio) 2202fa9e4066Sahrens { 2203fa9e4066Sahrens vdev_t *vd = zio->io_vd; 220444cd46caSbillm uint64_t align; 22050a4e9518Sgw spa_t *spa = zio->io_spa; 22060a4e9518Sgw 2207e14bb325SJeff Bonwick ASSERT(zio->io_error == 0); 2208e14bb325SJeff Bonwick ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); 2209fa9e4066Sahrens 2210e14bb325SJeff Bonwick if (vd == NULL) { 2211e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2212e14bb325SJeff Bonwick spa_config_enter(spa, SCL_ZIO, zio, RW_READER); 2213fa9e4066Sahrens 2214e14bb325SJeff Bonwick /* 2215e14bb325SJeff Bonwick * The mirror_ops handle multiple DVAs in a single BP. 2216e14bb325SJeff Bonwick */ 2217e14bb325SJeff Bonwick return (vdev_mirror_ops.vdev_op_io_start(zio)); 2218fa9e4066Sahrens } 2219fa9e4066Sahrens 2220e14bb325SJeff Bonwick align = 1ULL << vd->vdev_top->vdev_ashift; 2221e14bb325SJeff Bonwick 2222ecc2d604Sbonwick if (P2PHASE(zio->io_size, align) != 0) { 2223ecc2d604Sbonwick uint64_t asize = P2ROUNDUP(zio->io_size, align); 2224ecc2d604Sbonwick char *abuf = zio_buf_alloc(asize); 2225e14bb325SJeff Bonwick ASSERT(vd == vd->vdev_top); 2226ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_WRITE) { 2227ecc2d604Sbonwick bcopy(zio->io_data, abuf, zio->io_size); 2228ecc2d604Sbonwick bzero(abuf + zio->io_size, asize - zio->io_size); 2229ecc2d604Sbonwick } 2230e14bb325SJeff Bonwick zio_push_transform(zio, abuf, asize, asize, zio_subblock); 2231ecc2d604Sbonwick } 2232ecc2d604Sbonwick 2233ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_offset, align) == 0); 2234ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_size, align) == 0); 22358ad4d6ddSJeff Bonwick ASSERT(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); 22368ad4d6ddSJeff Bonwick 22378ad4d6ddSJeff Bonwick /* 22388ad4d6ddSJeff Bonwick * If this is a repair I/O, and there's no self-healing involved -- 22398ad4d6ddSJeff Bonwick * that is, we're just resilvering what we expect to resilver -- 22408ad4d6ddSJeff Bonwick * then don't do the I/O unless zio's txg is actually in vd's DTL. 22418ad4d6ddSJeff Bonwick * This prevents spurious resilvering with nested replication. 22428ad4d6ddSJeff Bonwick * For example, given a mirror of mirrors, (A+B)+(C+D), if only 22438ad4d6ddSJeff Bonwick * A is out of date, we'll read from C+D, then use the data to 22448ad4d6ddSJeff Bonwick * resilver A+B -- but we don't actually want to resilver B, just A. 22458ad4d6ddSJeff Bonwick * The top-level mirror has no way to know this, so instead we just 22468ad4d6ddSJeff Bonwick * discard unnecessary repairs as we work our way down the vdev tree. 22478ad4d6ddSJeff Bonwick * The same logic applies to any form of nested replication: 22488ad4d6ddSJeff Bonwick * ditto + mirror, RAID-Z + replacing, etc. This covers them all. 22498ad4d6ddSJeff Bonwick */ 22508ad4d6ddSJeff Bonwick if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && 22518ad4d6ddSJeff Bonwick !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && 22528ad4d6ddSJeff Bonwick zio->io_txg != 0 && /* not a delegated i/o */ 22538ad4d6ddSJeff Bonwick !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { 22548ad4d6ddSJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 22558ad4d6ddSJeff Bonwick zio_vdev_io_bypass(zio); 22568ad4d6ddSJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 22578ad4d6ddSJeff Bonwick } 2258fa9e4066Sahrens 2259e14bb325SJeff Bonwick if (vd->vdev_ops->vdev_op_leaf && 2260e14bb325SJeff Bonwick (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { 2261e14bb325SJeff Bonwick 2262e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) 2263a3f829aeSBill Moore return (ZIO_PIPELINE_CONTINUE); 2264e14bb325SJeff Bonwick 2265e14bb325SJeff Bonwick if ((zio = vdev_queue_io(zio)) == NULL) 2266e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2267e14bb325SJeff Bonwick 2268e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2269e14bb325SJeff Bonwick zio->io_error = ENXIO; 2270e14bb325SJeff Bonwick zio_interrupt(zio); 2271e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2272e14bb325SJeff Bonwick } 2273e14bb325SJeff Bonwick } 2274e14bb325SJeff Bonwick 2275e05725b1Sbonwick return (vd->vdev_ops->vdev_op_io_start(zio)); 2276fa9e4066Sahrens } 2277fa9e4066Sahrens 2278e05725b1Sbonwick static int 2279fa9e4066Sahrens zio_vdev_io_done(zio_t *zio) 2280fa9e4066Sahrens { 2281e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2282e14bb325SJeff Bonwick vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; 2283e14bb325SJeff Bonwick boolean_t unexpected_error = B_FALSE; 2284e05725b1Sbonwick 2285e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2286e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2287fa9e4066Sahrens 2288e14bb325SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); 2289e14bb325SJeff Bonwick 2290e14bb325SJeff Bonwick if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { 2291e14bb325SJeff Bonwick 2292e14bb325SJeff Bonwick vdev_queue_io_done(zio); 2293fa9e4066Sahrens 2294e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE) 2295e14bb325SJeff Bonwick vdev_cache_write(zio); 2296e14bb325SJeff Bonwick 2297e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 22988956713aSEric Schrock zio->io_error = zio_handle_device_injection(vd, 22998956713aSEric Schrock zio, EIO); 2300e14bb325SJeff Bonwick 2301e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2302e14bb325SJeff Bonwick zio->io_error = zio_handle_label_injection(zio, EIO); 2303e14bb325SJeff Bonwick 2304e14bb325SJeff Bonwick if (zio->io_error) { 2305e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2306e14bb325SJeff Bonwick zio->io_error = ENXIO; 2307e14bb325SJeff Bonwick } else { 2308e14bb325SJeff Bonwick unexpected_error = B_TRUE; 2309e14bb325SJeff Bonwick } 2310e14bb325SJeff Bonwick } 231151ece835Seschrock } 2312fa9e4066Sahrens 2313e14bb325SJeff Bonwick ops->vdev_op_io_done(zio); 2314e14bb325SJeff Bonwick 2315e14bb325SJeff Bonwick if (unexpected_error) 2316a3f829aeSBill Moore VERIFY(vdev_probe(vd, zio) == NULL); 2317e14bb325SJeff Bonwick 2318e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2319fa9e4066Sahrens } 2320fa9e4066Sahrens 232122fe2c88SJonathan Adams /* 232222fe2c88SJonathan Adams * For non-raidz ZIOs, we can just copy aside the bad data read from the 232322fe2c88SJonathan Adams * disk, and use that to finish the checksum ereport later. 232422fe2c88SJonathan Adams */ 232522fe2c88SJonathan Adams static void 232622fe2c88SJonathan Adams zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, 232722fe2c88SJonathan Adams const void *good_buf) 232822fe2c88SJonathan Adams { 232922fe2c88SJonathan Adams /* no processing needed */ 233022fe2c88SJonathan Adams zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); 233122fe2c88SJonathan Adams } 233222fe2c88SJonathan Adams 233322fe2c88SJonathan Adams /*ARGSUSED*/ 233422fe2c88SJonathan Adams void 233522fe2c88SJonathan Adams zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) 233622fe2c88SJonathan Adams { 233722fe2c88SJonathan Adams void *buf = zio_buf_alloc(zio->io_size); 233822fe2c88SJonathan Adams 233922fe2c88SJonathan Adams bcopy(zio->io_data, buf, zio->io_size); 234022fe2c88SJonathan Adams 234122fe2c88SJonathan Adams zcr->zcr_cbinfo = zio->io_size; 234222fe2c88SJonathan Adams zcr->zcr_cbdata = buf; 234322fe2c88SJonathan Adams zcr->zcr_finish = zio_vsd_default_cksum_finish; 234422fe2c88SJonathan Adams zcr->zcr_free = zio_buf_free; 234522fe2c88SJonathan Adams } 234622fe2c88SJonathan Adams 2347e05725b1Sbonwick static int 2348fa9e4066Sahrens zio_vdev_io_assess(zio_t *zio) 2349fa9e4066Sahrens { 2350fa9e4066Sahrens vdev_t *vd = zio->io_vd; 2351e14bb325SJeff Bonwick 2352e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2353e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2354e14bb325SJeff Bonwick 2355e14bb325SJeff Bonwick if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2356e14bb325SJeff Bonwick spa_config_exit(zio->io_spa, SCL_ZIO, zio); 2357e14bb325SJeff Bonwick 2358e14bb325SJeff Bonwick if (zio->io_vsd != NULL) { 235922fe2c88SJonathan Adams zio->io_vsd_ops->vsd_free(zio); 2360e14bb325SJeff Bonwick zio->io_vsd = NULL; 2361ecc2d604Sbonwick } 2362ecc2d604Sbonwick 2363e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2364ea8dc4b6Seschrock zio->io_error = zio_handle_fault_injection(zio, EIO); 2365ea8dc4b6Seschrock 2366fa9e4066Sahrens /* 2367fa9e4066Sahrens * If the I/O failed, determine whether we should attempt to retry it. 2368fa9e4066Sahrens */ 2369e14bb325SJeff Bonwick if (zio->io_error && vd == NULL && 2370e14bb325SJeff Bonwick !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { 2371e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ 2372e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ 2373fa9e4066Sahrens zio->io_error = 0; 2374e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_RETRY | 2375e14bb325SJeff Bonwick ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; 2376b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; 2377e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 2378e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2379ea8dc4b6Seschrock } 2380fa9e4066Sahrens 2381e14bb325SJeff Bonwick /* 2382e14bb325SJeff Bonwick * If we got an error on a leaf device, convert it to ENXIO 2383e14bb325SJeff Bonwick * if the device is not accessible at all. 2384e14bb325SJeff Bonwick */ 2385e14bb325SJeff Bonwick if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && 2386e14bb325SJeff Bonwick !vdev_accessible(vd, zio)) 2387e14bb325SJeff Bonwick zio->io_error = ENXIO; 2388e14bb325SJeff Bonwick 2389e14bb325SJeff Bonwick /* 2390e14bb325SJeff Bonwick * If we can't write to an interior vdev (mirror or RAID-Z), 2391e14bb325SJeff Bonwick * set vdev_cant_write so that we stop trying to allocate from it. 2392e14bb325SJeff Bonwick */ 2393e14bb325SJeff Bonwick if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && 2394e14bb325SJeff Bonwick vd != NULL && !vd->vdev_ops->vdev_op_leaf) 2395e14bb325SJeff Bonwick vd->vdev_cant_write = B_TRUE; 2396e14bb325SJeff Bonwick 2397e14bb325SJeff Bonwick if (zio->io_error) 2398e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2399e14bb325SJeff Bonwick 2400e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2401fa9e4066Sahrens } 2402fa9e4066Sahrens 2403fa9e4066Sahrens void 2404fa9e4066Sahrens zio_vdev_io_reissue(zio_t *zio) 2405fa9e4066Sahrens { 2406fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2407fa9e4066Sahrens ASSERT(zio->io_error == 0); 2408fa9e4066Sahrens 2409b24ab676SJeff Bonwick zio->io_stage >>= 1; 2410fa9e4066Sahrens } 2411fa9e4066Sahrens 2412fa9e4066Sahrens void 2413fa9e4066Sahrens zio_vdev_io_redone(zio_t *zio) 2414fa9e4066Sahrens { 2415fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); 2416fa9e4066Sahrens 2417b24ab676SJeff Bonwick zio->io_stage >>= 1; 2418fa9e4066Sahrens } 2419fa9e4066Sahrens 2420fa9e4066Sahrens void 2421fa9e4066Sahrens zio_vdev_io_bypass(zio_t *zio) 2422fa9e4066Sahrens { 2423fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2424fa9e4066Sahrens ASSERT(zio->io_error == 0); 2425fa9e4066Sahrens 2426fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_IO_BYPASS; 2427b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; 2428fa9e4066Sahrens } 2429fa9e4066Sahrens 2430fa9e4066Sahrens /* 2431fa9e4066Sahrens * ========================================================================== 2432fa9e4066Sahrens * Generate and verify checksums 2433fa9e4066Sahrens * ========================================================================== 2434fa9e4066Sahrens */ 2435e05725b1Sbonwick static int 2436fa9e4066Sahrens zio_checksum_generate(zio_t *zio) 2437fa9e4066Sahrens { 2438fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2439e14bb325SJeff Bonwick enum zio_checksum checksum; 2440fa9e4066Sahrens 2441e14bb325SJeff Bonwick if (bp == NULL) { 2442e14bb325SJeff Bonwick /* 2443e14bb325SJeff Bonwick * This is zio_write_phys(). 2444e14bb325SJeff Bonwick * We're either generating a label checksum, or none at all. 2445e14bb325SJeff Bonwick */ 2446e14bb325SJeff Bonwick checksum = zio->io_prop.zp_checksum; 2447e14bb325SJeff Bonwick 2448e14bb325SJeff Bonwick if (checksum == ZIO_CHECKSUM_OFF) 2449e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2450fa9e4066Sahrens 2451e14bb325SJeff Bonwick ASSERT(checksum == ZIO_CHECKSUM_LABEL); 2452e14bb325SJeff Bonwick } else { 2453e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { 2454e14bb325SJeff Bonwick ASSERT(!IO_IS_ALLOCATING(zio)); 2455e14bb325SJeff Bonwick checksum = ZIO_CHECKSUM_GANG_HEADER; 2456e14bb325SJeff Bonwick } else { 2457e14bb325SJeff Bonwick checksum = BP_GET_CHECKSUM(bp); 2458e14bb325SJeff Bonwick } 2459e14bb325SJeff Bonwick } 2460fa9e4066Sahrens 2461e14bb325SJeff Bonwick zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); 2462fa9e4066Sahrens 2463e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2464fa9e4066Sahrens } 2465fa9e4066Sahrens 2466e05725b1Sbonwick static int 2467e14bb325SJeff Bonwick zio_checksum_verify(zio_t *zio) 2468fa9e4066Sahrens { 246922fe2c88SJonathan Adams zio_bad_cksum_t info; 2470e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2471e14bb325SJeff Bonwick int error; 2472fa9e4066Sahrens 2473b24ab676SJeff Bonwick ASSERT(zio->io_vd != NULL); 2474b24ab676SJeff Bonwick 2475e14bb325SJeff Bonwick if (bp == NULL) { 2476e14bb325SJeff Bonwick /* 2477e14bb325SJeff Bonwick * This is zio_read_phys(). 2478e14bb325SJeff Bonwick * We're either verifying a label checksum, or nothing at all. 2479e14bb325SJeff Bonwick */ 2480e14bb325SJeff Bonwick if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) 2481e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2482fa9e4066Sahrens 2483e14bb325SJeff Bonwick ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); 2484e14bb325SJeff Bonwick } 2485fa9e4066Sahrens 248622fe2c88SJonathan Adams if ((error = zio_checksum_error(zio, &info)) != 0) { 2487e14bb325SJeff Bonwick zio->io_error = error; 2488e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { 248922fe2c88SJonathan Adams zfs_ereport_start_checksum(zio->io_spa, 249022fe2c88SJonathan Adams zio->io_vd, zio, zio->io_offset, 249122fe2c88SJonathan Adams zio->io_size, NULL, &info); 2492e14bb325SJeff Bonwick } 2493fa9e4066Sahrens } 2494fa9e4066Sahrens 2495e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2496fa9e4066Sahrens } 2497fa9e4066Sahrens 2498fa9e4066Sahrens /* 2499fa9e4066Sahrens * Called by RAID-Z to ensure we don't compute the checksum twice. 2500fa9e4066Sahrens */ 2501fa9e4066Sahrens void 2502fa9e4066Sahrens zio_checksum_verified(zio_t *zio) 2503fa9e4066Sahrens { 2504b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 2505fa9e4066Sahrens } 2506fa9e4066Sahrens 2507fa9e4066Sahrens /* 2508e14bb325SJeff Bonwick * ========================================================================== 2509e14bb325SJeff Bonwick * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. 2510e14bb325SJeff Bonwick * An error of 0 indictes success. ENXIO indicates whole-device failure, 2511e14bb325SJeff Bonwick * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO 2512e14bb325SJeff Bonwick * indicate errors that are specific to one I/O, and most likely permanent. 2513e14bb325SJeff Bonwick * Any other error is presumed to be worse because we weren't expecting it. 2514e14bb325SJeff Bonwick * ========================================================================== 2515fa9e4066Sahrens */ 2516e14bb325SJeff Bonwick int 2517e14bb325SJeff Bonwick zio_worst_error(int e1, int e2) 2518fa9e4066Sahrens { 2519e14bb325SJeff Bonwick static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; 2520e14bb325SJeff Bonwick int r1, r2; 2521e14bb325SJeff Bonwick 2522e14bb325SJeff Bonwick for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) 2523e14bb325SJeff Bonwick if (e1 == zio_error_rank[r1]) 2524e14bb325SJeff Bonwick break; 2525e14bb325SJeff Bonwick 2526e14bb325SJeff Bonwick for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) 2527e14bb325SJeff Bonwick if (e2 == zio_error_rank[r2]) 2528e14bb325SJeff Bonwick break; 252944cd46caSbillm 2530e14bb325SJeff Bonwick return (r1 > r2 ? e1 : e2); 2531fa9e4066Sahrens } 2532fa9e4066Sahrens 2533fa9e4066Sahrens /* 2534fa9e4066Sahrens * ========================================================================== 2535e14bb325SJeff Bonwick * I/O completion 2536fa9e4066Sahrens * ========================================================================== 2537fa9e4066Sahrens */ 2538e14bb325SJeff Bonwick static int 2539e14bb325SJeff Bonwick zio_ready(zio_t *zio) 2540fa9e4066Sahrens { 2541e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2542a3f829aeSBill Moore zio_t *pio, *pio_next; 2543fa9e4066Sahrens 2544b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 2545b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_READY)) 2546f5383399SBill Moore return (ZIO_PIPELINE_STOP); 2547fa9e4066Sahrens 2548f5383399SBill Moore if (zio->io_ready) { 2549e14bb325SJeff Bonwick ASSERT(IO_IS_ALLOCATING(zio)); 2550e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2551e14bb325SJeff Bonwick ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); 2552fa9e4066Sahrens 2553e14bb325SJeff Bonwick zio->io_ready(zio); 2554e14bb325SJeff Bonwick } 2555fa9e4066Sahrens 2556e14bb325SJeff Bonwick if (bp != NULL && bp != &zio->io_bp_copy) 2557e14bb325SJeff Bonwick zio->io_bp_copy = *bp; 2558fa9e4066Sahrens 2559e14bb325SJeff Bonwick if (zio->io_error) 2560e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2561fa9e4066Sahrens 2562a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2563a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = 1; 2564a3f829aeSBill Moore pio = zio_walk_parents(zio); 2565a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2566a3f829aeSBill Moore 2567a3f829aeSBill Moore /* 2568a3f829aeSBill Moore * As we notify zio's parents, new parents could be added. 2569a3f829aeSBill Moore * New parents go to the head of zio's io_parent_list, however, 2570a3f829aeSBill Moore * so we will (correctly) not notify them. The remainder of zio's 2571a3f829aeSBill Moore * io_parent_list, from 'pio_next' onward, cannot change because 2572a3f829aeSBill Moore * all parents must wait for us to be done before they can be done. 2573a3f829aeSBill Moore */ 2574a3f829aeSBill Moore for (; pio != NULL; pio = pio_next) { 2575a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2576e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_READY); 2577a3f829aeSBill Moore } 2578fa9e4066Sahrens 2579b24ab676SJeff Bonwick if (zio->io_flags & ZIO_FLAG_NODATA) { 2580b24ab676SJeff Bonwick if (BP_IS_GANG(bp)) { 2581b24ab676SJeff Bonwick zio->io_flags &= ~ZIO_FLAG_NODATA; 2582b24ab676SJeff Bonwick } else { 2583b24ab676SJeff Bonwick ASSERT((uintptr_t)zio->io_data < SPA_MAXBLOCKSIZE); 2584b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 2585b24ab676SJeff Bonwick } 2586b24ab676SJeff Bonwick } 2587b24ab676SJeff Bonwick 2588a33cae98STim Haley if (zio_injection_enabled && 2589a33cae98STim Haley zio->io_spa->spa_syncing_txg == zio->io_txg) 2590a33cae98STim Haley zio_handle_ignored_writes(zio); 2591a33cae98STim Haley 2592e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2593fa9e4066Sahrens } 2594fa9e4066Sahrens 2595e14bb325SJeff Bonwick static int 2596e14bb325SJeff Bonwick zio_done(zio_t *zio) 2597d63d470bSgw { 2598e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 2599e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 2600e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2601e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2602e14bb325SJeff Bonwick uint64_t psize = zio->io_size; 2603a3f829aeSBill Moore zio_t *pio, *pio_next; 2604d63d470bSgw 2605e14bb325SJeff Bonwick /* 2606f5383399SBill Moore * If our children haven't all completed, 2607e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 2608e14bb325SJeff Bonwick */ 2609e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || 2610e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || 2611b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE) || 2612e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) 2613e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2614d63d470bSgw 2615e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 2616e14bb325SJeff Bonwick for (int w = 0; w < ZIO_WAIT_TYPES; w++) 2617e14bb325SJeff Bonwick ASSERT(zio->io_children[c][w] == 0); 2618e14bb325SJeff Bonwick 2619e14bb325SJeff Bonwick if (bp != NULL) { 2620e14bb325SJeff Bonwick ASSERT(bp->blk_pad[0] == 0); 2621e14bb325SJeff Bonwick ASSERT(bp->blk_pad[1] == 0); 2622e14bb325SJeff Bonwick ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || 2623a3f829aeSBill Moore (bp == zio_unique_parent(zio)->io_bp)); 2624e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && 2625b24ab676SJeff Bonwick zio->io_bp_override == NULL && 2626e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { 2627e14bb325SJeff Bonwick ASSERT(!BP_SHOULD_BYTESWAP(bp)); 2628b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(bp)); 2629e14bb325SJeff Bonwick ASSERT(BP_COUNT_GANG(bp) == 0 || 2630e14bb325SJeff Bonwick (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); 2631e14bb325SJeff Bonwick } 2632e14bb325SJeff Bonwick } 2633fa9e4066Sahrens 2634e14bb325SJeff Bonwick /* 2635b24ab676SJeff Bonwick * If there were child vdev/gang/ddt errors, they apply to us now. 2636e14bb325SJeff Bonwick */ 2637e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); 2638e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_GANG); 2639b24ab676SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_DDT); 2640b24ab676SJeff Bonwick 2641b24ab676SJeff Bonwick /* 2642b24ab676SJeff Bonwick * If the I/O on the transformed data was successful, generate any 2643b24ab676SJeff Bonwick * checksum reports now while we still have the transformed data. 2644b24ab676SJeff Bonwick */ 2645b24ab676SJeff Bonwick if (zio->io_error == 0) { 2646b24ab676SJeff Bonwick while (zio->io_cksum_report != NULL) { 2647b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 2648b24ab676SJeff Bonwick uint64_t align = zcr->zcr_align; 2649b24ab676SJeff Bonwick uint64_t asize = P2ROUNDUP(psize, align); 2650b24ab676SJeff Bonwick char *abuf = zio->io_data; 2651b24ab676SJeff Bonwick 2652b24ab676SJeff Bonwick if (asize != psize) { 2653b24ab676SJeff Bonwick abuf = zio_buf_alloc(asize); 2654b24ab676SJeff Bonwick bcopy(zio->io_data, abuf, psize); 2655b24ab676SJeff Bonwick bzero(abuf + psize, asize - psize); 2656b24ab676SJeff Bonwick } 2657b24ab676SJeff Bonwick 2658b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 2659b24ab676SJeff Bonwick zcr->zcr_next = NULL; 2660b24ab676SJeff Bonwick zcr->zcr_finish(zcr, abuf); 2661b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 2662b24ab676SJeff Bonwick 2663b24ab676SJeff Bonwick if (asize != psize) 2664b24ab676SJeff Bonwick zio_buf_free(abuf, asize); 2665b24ab676SJeff Bonwick } 2666b24ab676SJeff Bonwick } 2667e14bb325SJeff Bonwick 2668e14bb325SJeff Bonwick zio_pop_transforms(zio); /* note: may set zio->io_error */ 2669e14bb325SJeff Bonwick 2670e14bb325SJeff Bonwick vdev_stat_update(zio, psize); 2671e14bb325SJeff Bonwick 2672e14bb325SJeff Bonwick if (zio->io_error) { 2673e14bb325SJeff Bonwick /* 2674e14bb325SJeff Bonwick * If this I/O is attached to a particular vdev, 2675e14bb325SJeff Bonwick * generate an error message describing the I/O failure 2676e14bb325SJeff Bonwick * at the block level. We ignore these errors if the 2677e14bb325SJeff Bonwick * device is currently unavailable. 2678e14bb325SJeff Bonwick */ 2679e14bb325SJeff Bonwick if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) 2680e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, zio, 0, 0); 2681e14bb325SJeff Bonwick 26828f18d1faSGeorge Wilson if ((zio->io_error == EIO || !(zio->io_flags & 26838f18d1faSGeorge Wilson (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && 26848f18d1faSGeorge Wilson zio == lio) { 2685e14bb325SJeff Bonwick /* 2686e14bb325SJeff Bonwick * For logical I/O requests, tell the SPA to log the 2687e14bb325SJeff Bonwick * error and generate a logical data ereport. 2688e14bb325SJeff Bonwick */ 2689e14bb325SJeff Bonwick spa_log_error(spa, zio); 2690e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, zio, 2691e14bb325SJeff Bonwick 0, 0); 2692e14bb325SJeff Bonwick } 2693e14bb325SJeff Bonwick } 2694fa9e4066Sahrens 2695e14bb325SJeff Bonwick if (zio->io_error && zio == lio) { 2696e14bb325SJeff Bonwick /* 2697e14bb325SJeff Bonwick * Determine whether zio should be reexecuted. This will 2698e14bb325SJeff Bonwick * propagate all the way to the root via zio_notify_parent(). 2699e14bb325SJeff Bonwick */ 2700e14bb325SJeff Bonwick ASSERT(vd == NULL && bp != NULL); 2701b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2702e14bb325SJeff Bonwick 2703b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(zio) && 2704b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_CANFAIL)) { 2705e14bb325SJeff Bonwick if (zio->io_error != ENOSPC) 2706e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_NOW; 2707e14bb325SJeff Bonwick else 2708e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2709b24ab676SJeff Bonwick } 2710e14bb325SJeff Bonwick 2711e14bb325SJeff Bonwick if ((zio->io_type == ZIO_TYPE_READ || 2712e14bb325SJeff Bonwick zio->io_type == ZIO_TYPE_FREE) && 2713e14bb325SJeff Bonwick zio->io_error == ENXIO && 27148ad4d6ddSJeff Bonwick spa->spa_load_state == SPA_LOAD_NONE && 2715e14bb325SJeff Bonwick spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) 2716e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2717e14bb325SJeff Bonwick 2718e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) 2719e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 272022fe2c88SJonathan Adams 272122fe2c88SJonathan Adams /* 272222fe2c88SJonathan Adams * Here is a possibly good place to attempt to do 272322fe2c88SJonathan Adams * either combinatorial reconstruction or error correction 272422fe2c88SJonathan Adams * based on checksums. It also might be a good place 272522fe2c88SJonathan Adams * to send out preliminary ereports before we suspend 272622fe2c88SJonathan Adams * processing. 272722fe2c88SJonathan Adams */ 2728d63d470bSgw } 2729d63d470bSgw 273067bd71c6Sperrin /* 2731e14bb325SJeff Bonwick * If there were logical child errors, they apply to us now. 2732e14bb325SJeff Bonwick * We defer this until now to avoid conflating logical child 2733e14bb325SJeff Bonwick * errors with errors that happened to the zio itself when 2734e14bb325SJeff Bonwick * updating vdev stats and reporting FMA events above. 273567bd71c6Sperrin */ 2736e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); 27378654d025Sperrin 2738b24ab676SJeff Bonwick if ((zio->io_error || zio->io_reexecute) && 2739b24ab676SJeff Bonwick IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && 2740b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REWRITE)) 2741f5383399SBill Moore zio_dva_unallocate(zio, zio->io_gang_tree, bp); 2742f5383399SBill Moore 2743f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 2744f5383399SBill Moore 274533a372edSGeorge Wilson /* 274633a372edSGeorge Wilson * Godfather I/Os should never suspend. 274733a372edSGeorge Wilson */ 274833a372edSGeorge Wilson if ((zio->io_flags & ZIO_FLAG_GODFATHER) && 274933a372edSGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) 275033a372edSGeorge Wilson zio->io_reexecute = 0; 275133a372edSGeorge Wilson 275233a372edSGeorge Wilson if (zio->io_reexecute) { 2753e14bb325SJeff Bonwick /* 2754e14bb325SJeff Bonwick * This is a logical I/O that wants to reexecute. 2755e14bb325SJeff Bonwick * 2756e14bb325SJeff Bonwick * Reexecute is top-down. When an i/o fails, if it's not 2757e14bb325SJeff Bonwick * the root, it simply notifies its parent and sticks around. 2758e14bb325SJeff Bonwick * The parent, seeing that it still has children in zio_done(), 2759e14bb325SJeff Bonwick * does the same. This percolates all the way up to the root. 2760e14bb325SJeff Bonwick * The root i/o will reexecute or suspend the entire tree. 2761e14bb325SJeff Bonwick * 2762e14bb325SJeff Bonwick * This approach ensures that zio_reexecute() honors 2763e14bb325SJeff Bonwick * all the original i/o dependency relationships, e.g. 2764e14bb325SJeff Bonwick * parents not executing until children are ready. 2765e14bb325SJeff Bonwick */ 2766e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2767fa9e4066Sahrens 2768f5383399SBill Moore zio->io_gang_leader = NULL; 2769e14bb325SJeff Bonwick 2770a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2771a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 2772a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2773a3f829aeSBill Moore 277454d692b7SGeorge Wilson /* 277554d692b7SGeorge Wilson * "The Godfather" I/O monitors its children but is 277654d692b7SGeorge Wilson * not a true parent to them. It will track them through 277754d692b7SGeorge Wilson * the pipeline but severs its ties whenever they get into 277854d692b7SGeorge Wilson * trouble (e.g. suspended). This allows "The Godfather" 277954d692b7SGeorge Wilson * I/O to return status without blocking. 278054d692b7SGeorge Wilson */ 278154d692b7SGeorge Wilson for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 278254d692b7SGeorge Wilson zio_link_t *zl = zio->io_walk_link; 278354d692b7SGeorge Wilson pio_next = zio_walk_parents(zio); 278454d692b7SGeorge Wilson 278554d692b7SGeorge Wilson if ((pio->io_flags & ZIO_FLAG_GODFATHER) && 278654d692b7SGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { 278754d692b7SGeorge Wilson zio_remove_child(pio, zio, zl); 278854d692b7SGeorge Wilson zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 278954d692b7SGeorge Wilson } 279054d692b7SGeorge Wilson } 279154d692b7SGeorge Wilson 2792a3f829aeSBill Moore if ((pio = zio_unique_parent(zio)) != NULL) { 2793e14bb325SJeff Bonwick /* 2794e14bb325SJeff Bonwick * We're not a root i/o, so there's nothing to do 2795e14bb325SJeff Bonwick * but notify our parent. Don't propagate errors 2796e14bb325SJeff Bonwick * upward since we haven't permanently failed yet. 2797e14bb325SJeff Bonwick */ 279833a372edSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 2799e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; 2800e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2801e14bb325SJeff Bonwick } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { 2802e14bb325SJeff Bonwick /* 2803e14bb325SJeff Bonwick * We'd fail again if we reexecuted now, so suspend 2804e14bb325SJeff Bonwick * until conditions improve (e.g. device comes online). 2805e14bb325SJeff Bonwick */ 2806e14bb325SJeff Bonwick zio_suspend(spa, zio); 2807e14bb325SJeff Bonwick } else { 2808e14bb325SJeff Bonwick /* 2809e14bb325SJeff Bonwick * Reexecution is potentially a huge amount of work. 2810e14bb325SJeff Bonwick * Hand it off to the otherwise-unused claim taskq. 2811e14bb325SJeff Bonwick */ 2812e14bb325SJeff Bonwick (void) taskq_dispatch( 2813e14bb325SJeff Bonwick spa->spa_zio_taskq[ZIO_TYPE_CLAIM][ZIO_TASKQ_ISSUE], 2814e14bb325SJeff Bonwick (task_func_t *)zio_reexecute, zio, TQ_SLEEP); 2815e14bb325SJeff Bonwick } 2816e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2817fa9e4066Sahrens } 2818fa9e4066Sahrens 2819b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 282033a372edSGeorge Wilson ASSERT(zio->io_reexecute == 0); 2821e14bb325SJeff Bonwick ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); 2822fa9e4066Sahrens 2823b24ab676SJeff Bonwick /* 2824b24ab676SJeff Bonwick * Report any checksum errors, since the I/O is complete. 2825b24ab676SJeff Bonwick */ 282622fe2c88SJonathan Adams while (zio->io_cksum_report != NULL) { 2827b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 2828b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 2829b24ab676SJeff Bonwick zcr->zcr_next = NULL; 2830b24ab676SJeff Bonwick zcr->zcr_finish(zcr, NULL); 2831b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 283222fe2c88SJonathan Adams } 283322fe2c88SJonathan Adams 2834a3f829aeSBill Moore /* 2835a3f829aeSBill Moore * It is the responsibility of the done callback to ensure that this 2836a3f829aeSBill Moore * particular zio is no longer discoverable for adoption, and as 2837a3f829aeSBill Moore * such, cannot acquire any new parents. 2838a3f829aeSBill Moore */ 2839e14bb325SJeff Bonwick if (zio->io_done) 2840e14bb325SJeff Bonwick zio->io_done(zio); 2841fa9e4066Sahrens 2842a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2843a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 2844a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2845fa9e4066Sahrens 2846a3f829aeSBill Moore for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 2847a3f829aeSBill Moore zio_link_t *zl = zio->io_walk_link; 2848a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2849a3f829aeSBill Moore zio_remove_child(pio, zio, zl); 2850e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2851e14bb325SJeff Bonwick } 2852fa9e4066Sahrens 2853e14bb325SJeff Bonwick if (zio->io_waiter != NULL) { 2854e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 2855e14bb325SJeff Bonwick zio->io_executor = NULL; 2856e14bb325SJeff Bonwick cv_broadcast(&zio->io_cv); 2857e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 2858e14bb325SJeff Bonwick } else { 2859e14bb325SJeff Bonwick zio_destroy(zio); 2860e14bb325SJeff Bonwick } 2861fa9e4066Sahrens 2862e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2863fa9e4066Sahrens } 286446341222Sperrin 286546341222Sperrin /* 2866e14bb325SJeff Bonwick * ========================================================================== 2867e14bb325SJeff Bonwick * I/O pipeline definition 2868e14bb325SJeff Bonwick * ========================================================================== 286946341222Sperrin */ 2870b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[] = { 2871e14bb325SJeff Bonwick NULL, 2872e14bb325SJeff Bonwick zio_read_bp_init, 2873b24ab676SJeff Bonwick zio_free_bp_init, 2874b24ab676SJeff Bonwick zio_issue_async, 2875e14bb325SJeff Bonwick zio_write_bp_init, 2876e14bb325SJeff Bonwick zio_checksum_generate, 2877b24ab676SJeff Bonwick zio_ddt_read_start, 2878b24ab676SJeff Bonwick zio_ddt_read_done, 2879b24ab676SJeff Bonwick zio_ddt_write, 2880b24ab676SJeff Bonwick zio_ddt_free, 2881e14bb325SJeff Bonwick zio_gang_assemble, 2882e14bb325SJeff Bonwick zio_gang_issue, 2883e14bb325SJeff Bonwick zio_dva_allocate, 2884e14bb325SJeff Bonwick zio_dva_free, 2885e14bb325SJeff Bonwick zio_dva_claim, 2886e14bb325SJeff Bonwick zio_ready, 2887e14bb325SJeff Bonwick zio_vdev_io_start, 2888e14bb325SJeff Bonwick zio_vdev_io_done, 2889e14bb325SJeff Bonwick zio_vdev_io_assess, 2890e14bb325SJeff Bonwick zio_checksum_verify, 2891e14bb325SJeff Bonwick zio_done 2892e14bb325SJeff Bonwick }; 2893