1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 223f9d6ad7SLin Ling * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 2309c9d376SGeorge Wilson * Copyright (c) 2011 by Delphix. All rights reserved. 24*5aeb9474SGarrett D'Amore * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved. 25fa9e4066Sahrens */ 26fa9e4066Sahrens 27fa9e4066Sahrens #include <sys/zfs_context.h> 28ea8dc4b6Seschrock #include <sys/fm/fs/zfs.h> 29fa9e4066Sahrens #include <sys/spa.h> 30fa9e4066Sahrens #include <sys/txg.h> 31fa9e4066Sahrens #include <sys/spa_impl.h> 32fa9e4066Sahrens #include <sys/vdev_impl.h> 33fa9e4066Sahrens #include <sys/zio_impl.h> 34fa9e4066Sahrens #include <sys/zio_compress.h> 35fa9e4066Sahrens #include <sys/zio_checksum.h> 36b24ab676SJeff Bonwick #include <sys/dmu_objset.h> 37b24ab676SJeff Bonwick #include <sys/arc.h> 38b24ab676SJeff Bonwick #include <sys/ddt.h> 39fa9e4066Sahrens 40fa9e4066Sahrens /* 41fa9e4066Sahrens * ========================================================================== 42fa9e4066Sahrens * I/O priority table 43fa9e4066Sahrens * ========================================================================== 44fa9e4066Sahrens */ 45fa9e4066Sahrens uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE] = { 46fa9e4066Sahrens 0, /* ZIO_PRIORITY_NOW */ 47fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_READ */ 48fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_WRITE */ 49fa9e4066Sahrens 0, /* ZIO_PRIORITY_LOG_WRITE */ 5080eb36f2SGeorge Wilson 1, /* ZIO_PRIORITY_CACHE_FILL */ 5180eb36f2SGeorge Wilson 1, /* ZIO_PRIORITY_AGG */ 5280eb36f2SGeorge Wilson 4, /* ZIO_PRIORITY_FREE */ 5380eb36f2SGeorge Wilson 4, /* ZIO_PRIORITY_ASYNC_WRITE */ 5480eb36f2SGeorge Wilson 6, /* ZIO_PRIORITY_ASYNC_READ */ 55fa9e4066Sahrens 10, /* ZIO_PRIORITY_RESILVER */ 56fa9e4066Sahrens 20, /* ZIO_PRIORITY_SCRUB */ 57c7cd2421SGeorge Wilson 2, /* ZIO_PRIORITY_DDT_PREFETCH */ 58fa9e4066Sahrens }; 59fa9e4066Sahrens 60fa9e4066Sahrens /* 61fa9e4066Sahrens * ========================================================================== 62fa9e4066Sahrens * I/O type descriptions 63fa9e4066Sahrens * ========================================================================== 64fa9e4066Sahrens */ 65fa9e4066Sahrens char *zio_type_name[ZIO_TYPES] = { 6680eb36f2SGeorge Wilson "zio_null", "zio_read", "zio_write", "zio_free", "zio_claim", 6780eb36f2SGeorge Wilson "zio_ioctl" 6880eb36f2SGeorge Wilson }; 69fa9e4066Sahrens 70fa9e4066Sahrens /* 71fa9e4066Sahrens * ========================================================================== 72fa9e4066Sahrens * I/O kmem caches 73fa9e4066Sahrens * ========================================================================== 74fa9e4066Sahrens */ 75ccae0b50Seschrock kmem_cache_t *zio_cache; 76a3f829aeSBill Moore kmem_cache_t *zio_link_cache; 77fa9e4066Sahrens kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 78ad23a2dbSjohansen kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 79ad23a2dbSjohansen 80ad23a2dbSjohansen #ifdef _KERNEL 81ad23a2dbSjohansen extern vmem_t *zio_alloc_arena; 82ad23a2dbSjohansen #endif 8309c9d376SGeorge Wilson extern int zfs_mg_alloc_failures; 84fa9e4066Sahrens 850a4e9518Sgw /* 86e14bb325SJeff Bonwick * An allocating zio is one that either currently has the DVA allocate 87e14bb325SJeff Bonwick * stage set or will have it later in its lifetime. 880a4e9518Sgw */ 89b24ab676SJeff Bonwick #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) 90b24ab676SJeff Bonwick 9135a5a358SJonathan Adams boolean_t zio_requeue_io_start_cut_in_line = B_TRUE; 9235a5a358SJonathan Adams 93b24ab676SJeff Bonwick #ifdef ZFS_DEBUG 94b24ab676SJeff Bonwick int zio_buf_debug_limit = 16384; 95b24ab676SJeff Bonwick #else 96b24ab676SJeff Bonwick int zio_buf_debug_limit = 0; 97b24ab676SJeff Bonwick #endif 980a4e9518Sgw 99fa9e4066Sahrens void 100fa9e4066Sahrens zio_init(void) 101fa9e4066Sahrens { 102fa9e4066Sahrens size_t c; 103ad23a2dbSjohansen vmem_t *data_alloc_arena = NULL; 104ad23a2dbSjohansen 105ad23a2dbSjohansen #ifdef _KERNEL 106ad23a2dbSjohansen data_alloc_arena = zio_alloc_arena; 107ad23a2dbSjohansen #endif 108a3f829aeSBill Moore zio_cache = kmem_cache_create("zio_cache", 109a3f829aeSBill Moore sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 110a3f829aeSBill Moore zio_link_cache = kmem_cache_create("zio_link_cache", 111a3f829aeSBill Moore sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 112ccae0b50Seschrock 113fa9e4066Sahrens /* 114fa9e4066Sahrens * For small buffers, we want a cache for each multiple of 115fa9e4066Sahrens * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache 116fa9e4066Sahrens * for each quarter-power of 2. For large buffers, we want 117fa9e4066Sahrens * a cache for each multiple of PAGESIZE. 118fa9e4066Sahrens */ 119fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 120fa9e4066Sahrens size_t size = (c + 1) << SPA_MINBLOCKSHIFT; 121fa9e4066Sahrens size_t p2 = size; 122fa9e4066Sahrens size_t align = 0; 123e291592aSJonathan Adams size_t cflags = (size > zio_buf_debug_limit) ? KMC_NODEBUG : 0; 124fa9e4066Sahrens 125fa9e4066Sahrens while (p2 & (p2 - 1)) 126fa9e4066Sahrens p2 &= p2 - 1; 127fa9e4066Sahrens 128fa9e4066Sahrens if (size <= 4 * SPA_MINBLOCKSIZE) { 129fa9e4066Sahrens align = SPA_MINBLOCKSIZE; 130fa9e4066Sahrens } else if (P2PHASE(size, PAGESIZE) == 0) { 131fa9e4066Sahrens align = PAGESIZE; 132fa9e4066Sahrens } else if (P2PHASE(size, p2 >> 2) == 0) { 133fa9e4066Sahrens align = p2 >> 2; 134fa9e4066Sahrens } 135fa9e4066Sahrens 136fa9e4066Sahrens if (align != 0) { 137ad23a2dbSjohansen char name[36]; 1385ad82045Snd (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); 139fa9e4066Sahrens zio_buf_cache[c] = kmem_cache_create(name, size, 140e291592aSJonathan Adams align, NULL, NULL, NULL, NULL, NULL, cflags); 141ad23a2dbSjohansen 142e291592aSJonathan Adams /* 143e291592aSJonathan Adams * Since zio_data bufs do not appear in crash dumps, we 144e291592aSJonathan Adams * pass KMC_NOTOUCH so that no allocator metadata is 145e291592aSJonathan Adams * stored with the buffers. 146e291592aSJonathan Adams */ 147ad23a2dbSjohansen (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); 148ad23a2dbSjohansen zio_data_buf_cache[c] = kmem_cache_create(name, size, 149ad23a2dbSjohansen align, NULL, NULL, NULL, NULL, data_alloc_arena, 150e291592aSJonathan Adams cflags | KMC_NOTOUCH); 151fa9e4066Sahrens } 152fa9e4066Sahrens } 153fa9e4066Sahrens 154fa9e4066Sahrens while (--c != 0) { 155fa9e4066Sahrens ASSERT(zio_buf_cache[c] != NULL); 156fa9e4066Sahrens if (zio_buf_cache[c - 1] == NULL) 157fa9e4066Sahrens zio_buf_cache[c - 1] = zio_buf_cache[c]; 158ad23a2dbSjohansen 159ad23a2dbSjohansen ASSERT(zio_data_buf_cache[c] != NULL); 160ad23a2dbSjohansen if (zio_data_buf_cache[c - 1] == NULL) 161ad23a2dbSjohansen zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; 162fa9e4066Sahrens } 163ea8dc4b6Seschrock 16409c9d376SGeorge Wilson /* 16509c9d376SGeorge Wilson * The zio write taskqs have 1 thread per cpu, allow 1/2 of the taskqs 16609c9d376SGeorge Wilson * to fail 3 times per txg or 8 failures, whichever is greater. 16709c9d376SGeorge Wilson */ 16809c9d376SGeorge Wilson zfs_mg_alloc_failures = MAX((3 * max_ncpus / 2), 8); 16909c9d376SGeorge Wilson 170ea8dc4b6Seschrock zio_inject_init(); 171fa9e4066Sahrens } 172fa9e4066Sahrens 173fa9e4066Sahrens void 174fa9e4066Sahrens zio_fini(void) 175fa9e4066Sahrens { 176fa9e4066Sahrens size_t c; 177fa9e4066Sahrens kmem_cache_t *last_cache = NULL; 178ad23a2dbSjohansen kmem_cache_t *last_data_cache = NULL; 179fa9e4066Sahrens 180fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 181fa9e4066Sahrens if (zio_buf_cache[c] != last_cache) { 182fa9e4066Sahrens last_cache = zio_buf_cache[c]; 183fa9e4066Sahrens kmem_cache_destroy(zio_buf_cache[c]); 184fa9e4066Sahrens } 185fa9e4066Sahrens zio_buf_cache[c] = NULL; 186ad23a2dbSjohansen 187ad23a2dbSjohansen if (zio_data_buf_cache[c] != last_data_cache) { 188ad23a2dbSjohansen last_data_cache = zio_data_buf_cache[c]; 189ad23a2dbSjohansen kmem_cache_destroy(zio_data_buf_cache[c]); 190ad23a2dbSjohansen } 191ad23a2dbSjohansen zio_data_buf_cache[c] = NULL; 192fa9e4066Sahrens } 193ea8dc4b6Seschrock 194a3f829aeSBill Moore kmem_cache_destroy(zio_link_cache); 195ccae0b50Seschrock kmem_cache_destroy(zio_cache); 196ccae0b50Seschrock 197ea8dc4b6Seschrock zio_inject_fini(); 198fa9e4066Sahrens } 199fa9e4066Sahrens 200fa9e4066Sahrens /* 201fa9e4066Sahrens * ========================================================================== 202fa9e4066Sahrens * Allocate and free I/O buffers 203fa9e4066Sahrens * ========================================================================== 204fa9e4066Sahrens */ 205ad23a2dbSjohansen 206ad23a2dbSjohansen /* 207ad23a2dbSjohansen * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a 208ad23a2dbSjohansen * crashdump if the kernel panics, so use it judiciously. Obviously, it's 209ad23a2dbSjohansen * useful to inspect ZFS metadata, but if possible, we should avoid keeping 210ad23a2dbSjohansen * excess / transient data in-core during a crashdump. 211ad23a2dbSjohansen */ 212fa9e4066Sahrens void * 213fa9e4066Sahrens zio_buf_alloc(size_t size) 214fa9e4066Sahrens { 215fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 216fa9e4066Sahrens 217fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 218fa9e4066Sahrens 2191ab7f2deSmaybee return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); 220fa9e4066Sahrens } 221fa9e4066Sahrens 222ad23a2dbSjohansen /* 223ad23a2dbSjohansen * Use zio_data_buf_alloc to allocate data. The data will not appear in a 224ad23a2dbSjohansen * crashdump if the kernel panics. This exists so that we will limit the amount 225ad23a2dbSjohansen * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount 226ad23a2dbSjohansen * of kernel heap dumped to disk when the kernel panics) 227ad23a2dbSjohansen */ 228ad23a2dbSjohansen void * 229ad23a2dbSjohansen zio_data_buf_alloc(size_t size) 230ad23a2dbSjohansen { 231ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 232ad23a2dbSjohansen 233ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 234ad23a2dbSjohansen 2351ab7f2deSmaybee return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); 236ad23a2dbSjohansen } 237ad23a2dbSjohansen 238fa9e4066Sahrens void 239fa9e4066Sahrens zio_buf_free(void *buf, size_t size) 240fa9e4066Sahrens { 241fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 242fa9e4066Sahrens 243fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 244fa9e4066Sahrens 245fa9e4066Sahrens kmem_cache_free(zio_buf_cache[c], buf); 246fa9e4066Sahrens } 247fa9e4066Sahrens 248ad23a2dbSjohansen void 249ad23a2dbSjohansen zio_data_buf_free(void *buf, size_t size) 250ad23a2dbSjohansen { 251ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 252ad23a2dbSjohansen 253ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 254ad23a2dbSjohansen 255ad23a2dbSjohansen kmem_cache_free(zio_data_buf_cache[c], buf); 256ad23a2dbSjohansen } 257b3995adbSahrens 258fa9e4066Sahrens /* 259fa9e4066Sahrens * ========================================================================== 260fa9e4066Sahrens * Push and pop I/O transform buffers 261fa9e4066Sahrens * ========================================================================== 262fa9e4066Sahrens */ 263fa9e4066Sahrens static void 264e14bb325SJeff Bonwick zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, 265e14bb325SJeff Bonwick zio_transform_func_t *transform) 266fa9e4066Sahrens { 267fa9e4066Sahrens zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); 268fa9e4066Sahrens 269e14bb325SJeff Bonwick zt->zt_orig_data = zio->io_data; 270e14bb325SJeff Bonwick zt->zt_orig_size = zio->io_size; 271fa9e4066Sahrens zt->zt_bufsize = bufsize; 272e14bb325SJeff Bonwick zt->zt_transform = transform; 273fa9e4066Sahrens 274fa9e4066Sahrens zt->zt_next = zio->io_transform_stack; 275fa9e4066Sahrens zio->io_transform_stack = zt; 276fa9e4066Sahrens 277fa9e4066Sahrens zio->io_data = data; 278fa9e4066Sahrens zio->io_size = size; 279fa9e4066Sahrens } 280fa9e4066Sahrens 281fa9e4066Sahrens static void 282e14bb325SJeff Bonwick zio_pop_transforms(zio_t *zio) 283fa9e4066Sahrens { 284e14bb325SJeff Bonwick zio_transform_t *zt; 285e14bb325SJeff Bonwick 286e14bb325SJeff Bonwick while ((zt = zio->io_transform_stack) != NULL) { 287e14bb325SJeff Bonwick if (zt->zt_transform != NULL) 288e14bb325SJeff Bonwick zt->zt_transform(zio, 289e14bb325SJeff Bonwick zt->zt_orig_data, zt->zt_orig_size); 290fa9e4066Sahrens 291b24ab676SJeff Bonwick if (zt->zt_bufsize != 0) 292b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zt->zt_bufsize); 293fa9e4066Sahrens 294e14bb325SJeff Bonwick zio->io_data = zt->zt_orig_data; 295e14bb325SJeff Bonwick zio->io_size = zt->zt_orig_size; 296e14bb325SJeff Bonwick zio->io_transform_stack = zt->zt_next; 297fa9e4066Sahrens 298e14bb325SJeff Bonwick kmem_free(zt, sizeof (zio_transform_t)); 299fa9e4066Sahrens } 300fa9e4066Sahrens } 301fa9e4066Sahrens 302e14bb325SJeff Bonwick /* 303e14bb325SJeff Bonwick * ========================================================================== 304e14bb325SJeff Bonwick * I/O transform callbacks for subblocks and decompression 305e14bb325SJeff Bonwick * ========================================================================== 306e14bb325SJeff Bonwick */ 307e14bb325SJeff Bonwick static void 308e14bb325SJeff Bonwick zio_subblock(zio_t *zio, void *data, uint64_t size) 309e14bb325SJeff Bonwick { 310e14bb325SJeff Bonwick ASSERT(zio->io_size > size); 311e14bb325SJeff Bonwick 312e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ) 313e14bb325SJeff Bonwick bcopy(zio->io_data, data, size); 314e14bb325SJeff Bonwick } 315e14bb325SJeff Bonwick 316e14bb325SJeff Bonwick static void 317e14bb325SJeff Bonwick zio_decompress(zio_t *zio, void *data, uint64_t size) 318e14bb325SJeff Bonwick { 319e14bb325SJeff Bonwick if (zio->io_error == 0 && 320e14bb325SJeff Bonwick zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), 321b24ab676SJeff Bonwick zio->io_data, data, zio->io_size, size) != 0) 322e14bb325SJeff Bonwick zio->io_error = EIO; 323e14bb325SJeff Bonwick } 324e14bb325SJeff Bonwick 325e14bb325SJeff Bonwick /* 326e14bb325SJeff Bonwick * ========================================================================== 327e14bb325SJeff Bonwick * I/O parent/child relationships and pipeline interlocks 328e14bb325SJeff Bonwick * ========================================================================== 329e14bb325SJeff Bonwick */ 330a3f829aeSBill Moore /* 331a3f829aeSBill Moore * NOTE - Callers to zio_walk_parents() and zio_walk_children must 332a3f829aeSBill Moore * continue calling these functions until they return NULL. 333a3f829aeSBill Moore * Otherwise, the next caller will pick up the list walk in 334a3f829aeSBill Moore * some indeterminate state. (Otherwise every caller would 335a3f829aeSBill Moore * have to pass in a cookie to keep the state represented by 336a3f829aeSBill Moore * io_walk_link, which gets annoying.) 337a3f829aeSBill Moore */ 338a3f829aeSBill Moore zio_t * 339a3f829aeSBill Moore zio_walk_parents(zio_t *cio) 340a3f829aeSBill Moore { 341a3f829aeSBill Moore zio_link_t *zl = cio->io_walk_link; 342a3f829aeSBill Moore list_t *pl = &cio->io_parent_list; 343e14bb325SJeff Bonwick 344a3f829aeSBill Moore zl = (zl == NULL) ? list_head(pl) : list_next(pl, zl); 345a3f829aeSBill Moore cio->io_walk_link = zl; 346a3f829aeSBill Moore 347a3f829aeSBill Moore if (zl == NULL) 348a3f829aeSBill Moore return (NULL); 349a3f829aeSBill Moore 350a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 351a3f829aeSBill Moore return (zl->zl_parent); 352a3f829aeSBill Moore } 353a3f829aeSBill Moore 354a3f829aeSBill Moore zio_t * 355a3f829aeSBill Moore zio_walk_children(zio_t *pio) 356a3f829aeSBill Moore { 357a3f829aeSBill Moore zio_link_t *zl = pio->io_walk_link; 358a3f829aeSBill Moore list_t *cl = &pio->io_child_list; 359a3f829aeSBill Moore 360a3f829aeSBill Moore zl = (zl == NULL) ? list_head(cl) : list_next(cl, zl); 361a3f829aeSBill Moore pio->io_walk_link = zl; 362a3f829aeSBill Moore 363a3f829aeSBill Moore if (zl == NULL) 364a3f829aeSBill Moore return (NULL); 365a3f829aeSBill Moore 366a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 367a3f829aeSBill Moore return (zl->zl_child); 368a3f829aeSBill Moore } 369a3f829aeSBill Moore 370a3f829aeSBill Moore zio_t * 371a3f829aeSBill Moore zio_unique_parent(zio_t *cio) 372a3f829aeSBill Moore { 373a3f829aeSBill Moore zio_t *pio = zio_walk_parents(cio); 374a3f829aeSBill Moore 375a3f829aeSBill Moore VERIFY(zio_walk_parents(cio) == NULL); 376a3f829aeSBill Moore return (pio); 377a3f829aeSBill Moore } 378a3f829aeSBill Moore 379a3f829aeSBill Moore void 380a3f829aeSBill Moore zio_add_child(zio_t *pio, zio_t *cio) 381e14bb325SJeff Bonwick { 382a3f829aeSBill Moore zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); 383a3f829aeSBill Moore 384a3f829aeSBill Moore /* 385a3f829aeSBill Moore * Logical I/Os can have logical, gang, or vdev children. 386a3f829aeSBill Moore * Gang I/Os can have gang or vdev children. 387a3f829aeSBill Moore * Vdev I/Os can only have vdev children. 388a3f829aeSBill Moore * The following ASSERT captures all of these constraints. 389a3f829aeSBill Moore */ 390a3f829aeSBill Moore ASSERT(cio->io_child_type <= pio->io_child_type); 391a3f829aeSBill Moore 392a3f829aeSBill Moore zl->zl_parent = pio; 393a3f829aeSBill Moore zl->zl_child = cio; 394a3f829aeSBill Moore 395a3f829aeSBill Moore mutex_enter(&cio->io_lock); 396e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 397a3f829aeSBill Moore 398a3f829aeSBill Moore ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); 399a3f829aeSBill Moore 400a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 401a3f829aeSBill Moore pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; 402a3f829aeSBill Moore 403a3f829aeSBill Moore list_insert_head(&pio->io_child_list, zl); 404a3f829aeSBill Moore list_insert_head(&cio->io_parent_list, zl); 405a3f829aeSBill Moore 406b24ab676SJeff Bonwick pio->io_child_count++; 407b24ab676SJeff Bonwick cio->io_parent_count++; 408b24ab676SJeff Bonwick 409e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 410a3f829aeSBill Moore mutex_exit(&cio->io_lock); 411e14bb325SJeff Bonwick } 412e14bb325SJeff Bonwick 413fa9e4066Sahrens static void 414a3f829aeSBill Moore zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) 415e14bb325SJeff Bonwick { 416a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 417a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 418e14bb325SJeff Bonwick 419a3f829aeSBill Moore mutex_enter(&cio->io_lock); 420e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 421a3f829aeSBill Moore 422a3f829aeSBill Moore list_remove(&pio->io_child_list, zl); 423a3f829aeSBill Moore list_remove(&cio->io_parent_list, zl); 424a3f829aeSBill Moore 425b24ab676SJeff Bonwick pio->io_child_count--; 426b24ab676SJeff Bonwick cio->io_parent_count--; 427b24ab676SJeff Bonwick 428e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 429a3f829aeSBill Moore mutex_exit(&cio->io_lock); 430a3f829aeSBill Moore 431a3f829aeSBill Moore kmem_cache_free(zio_link_cache, zl); 432e14bb325SJeff Bonwick } 433e14bb325SJeff Bonwick 434e14bb325SJeff Bonwick static boolean_t 435e14bb325SJeff Bonwick zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) 436fa9e4066Sahrens { 437e14bb325SJeff Bonwick uint64_t *countp = &zio->io_children[child][wait]; 438e14bb325SJeff Bonwick boolean_t waiting = B_FALSE; 439e14bb325SJeff Bonwick 440e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 441e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 442e14bb325SJeff Bonwick if (*countp != 0) { 443b24ab676SJeff Bonwick zio->io_stage >>= 1; 444e14bb325SJeff Bonwick zio->io_stall = countp; 445e14bb325SJeff Bonwick waiting = B_TRUE; 446e14bb325SJeff Bonwick } 447e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 448e14bb325SJeff Bonwick 449e14bb325SJeff Bonwick return (waiting); 450e14bb325SJeff Bonwick } 451fa9e4066Sahrens 452e14bb325SJeff Bonwick static void 453e14bb325SJeff Bonwick zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) 454e14bb325SJeff Bonwick { 455e14bb325SJeff Bonwick uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; 456e14bb325SJeff Bonwick int *errorp = &pio->io_child_error[zio->io_child_type]; 457fa9e4066Sahrens 458e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 459e14bb325SJeff Bonwick if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 460e14bb325SJeff Bonwick *errorp = zio_worst_error(*errorp, zio->io_error); 461e14bb325SJeff Bonwick pio->io_reexecute |= zio->io_reexecute; 462e14bb325SJeff Bonwick ASSERT3U(*countp, >, 0); 463e14bb325SJeff Bonwick if (--*countp == 0 && pio->io_stall == countp) { 464e14bb325SJeff Bonwick pio->io_stall = NULL; 465e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 466e14bb325SJeff Bonwick zio_execute(pio); 467e14bb325SJeff Bonwick } else { 468e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 469fa9e4066Sahrens } 470fa9e4066Sahrens } 471fa9e4066Sahrens 472e14bb325SJeff Bonwick static void 473e14bb325SJeff Bonwick zio_inherit_child_errors(zio_t *zio, enum zio_child c) 474e14bb325SJeff Bonwick { 475e14bb325SJeff Bonwick if (zio->io_child_error[c] != 0 && zio->io_error == 0) 476e14bb325SJeff Bonwick zio->io_error = zio->io_child_error[c]; 477e14bb325SJeff Bonwick } 478e14bb325SJeff Bonwick 479fa9e4066Sahrens /* 480fa9e4066Sahrens * ========================================================================== 481e14bb325SJeff Bonwick * Create the various types of I/O (read, write, free, etc) 482fa9e4066Sahrens * ========================================================================== 483fa9e4066Sahrens */ 484fa9e4066Sahrens static zio_t * 485b24ab676SJeff Bonwick zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 486fa9e4066Sahrens void *data, uint64_t size, zio_done_func_t *done, void *private, 487b24ab676SJeff Bonwick zio_type_t type, int priority, enum zio_flag flags, 488b24ab676SJeff Bonwick vdev_t *vd, uint64_t offset, const zbookmark_t *zb, 489b24ab676SJeff Bonwick enum zio_stage stage, enum zio_stage pipeline) 490fa9e4066Sahrens { 491fa9e4066Sahrens zio_t *zio; 492fa9e4066Sahrens 493fa9e4066Sahrens ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); 494fa9e4066Sahrens ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); 495e14bb325SJeff Bonwick ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); 496fa9e4066Sahrens 497e14bb325SJeff Bonwick ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); 498e14bb325SJeff Bonwick ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); 499e14bb325SJeff Bonwick ASSERT(vd || stage == ZIO_STAGE_OPEN); 500088f3894Sahrens 501ccae0b50Seschrock zio = kmem_cache_alloc(zio_cache, KM_SLEEP); 502ccae0b50Seschrock bzero(zio, sizeof (zio_t)); 503e14bb325SJeff Bonwick 504e14bb325SJeff Bonwick mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); 505e14bb325SJeff Bonwick cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); 506e14bb325SJeff Bonwick 507a3f829aeSBill Moore list_create(&zio->io_parent_list, sizeof (zio_link_t), 508a3f829aeSBill Moore offsetof(zio_link_t, zl_parent_node)); 509a3f829aeSBill Moore list_create(&zio->io_child_list, sizeof (zio_link_t), 510a3f829aeSBill Moore offsetof(zio_link_t, zl_child_node)); 511a3f829aeSBill Moore 512e14bb325SJeff Bonwick if (vd != NULL) 513e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_VDEV; 514e14bb325SJeff Bonwick else if (flags & ZIO_FLAG_GANG_CHILD) 515e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_GANG; 516b24ab676SJeff Bonwick else if (flags & ZIO_FLAG_DDT_CHILD) 517b24ab676SJeff Bonwick zio->io_child_type = ZIO_CHILD_DDT; 518e14bb325SJeff Bonwick else 519e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_LOGICAL; 520e14bb325SJeff Bonwick 521fa9e4066Sahrens if (bp != NULL) { 522b24ab676SJeff Bonwick zio->io_bp = (blkptr_t *)bp; 523fa9e4066Sahrens zio->io_bp_copy = *bp; 524fa9e4066Sahrens zio->io_bp_orig = *bp; 525b24ab676SJeff Bonwick if (type != ZIO_TYPE_WRITE || 526b24ab676SJeff Bonwick zio->io_child_type == ZIO_CHILD_DDT) 527e14bb325SJeff Bonwick zio->io_bp = &zio->io_bp_copy; /* so caller can free */ 528f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL) 529e14bb325SJeff Bonwick zio->io_logical = zio; 530f5383399SBill Moore if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) 531f5383399SBill Moore pipeline |= ZIO_GANG_STAGES; 532fa9e4066Sahrens } 533e14bb325SJeff Bonwick 534e14bb325SJeff Bonwick zio->io_spa = spa; 535e14bb325SJeff Bonwick zio->io_txg = txg; 536fa9e4066Sahrens zio->io_done = done; 537fa9e4066Sahrens zio->io_private = private; 538fa9e4066Sahrens zio->io_type = type; 539fa9e4066Sahrens zio->io_priority = priority; 540e14bb325SJeff Bonwick zio->io_vd = vd; 541e14bb325SJeff Bonwick zio->io_offset = offset; 542b24ab676SJeff Bonwick zio->io_orig_data = zio->io_data = data; 543b24ab676SJeff Bonwick zio->io_orig_size = zio->io_size = size; 544e14bb325SJeff Bonwick zio->io_orig_flags = zio->io_flags = flags; 545e14bb325SJeff Bonwick zio->io_orig_stage = zio->io_stage = stage; 546e14bb325SJeff Bonwick zio->io_orig_pipeline = zio->io_pipeline = pipeline; 547fa9e4066Sahrens 548a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); 549a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); 550a3f829aeSBill Moore 551e14bb325SJeff Bonwick if (zb != NULL) 552e14bb325SJeff Bonwick zio->io_bookmark = *zb; 553e14bb325SJeff Bonwick 554e14bb325SJeff Bonwick if (pio != NULL) { 555e14bb325SJeff Bonwick if (zio->io_logical == NULL) 556ea8dc4b6Seschrock zio->io_logical = pio->io_logical; 557f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_GANG) 558f5383399SBill Moore zio->io_gang_leader = pio->io_gang_leader; 559e14bb325SJeff Bonwick zio_add_child(pio, zio); 560fa9e4066Sahrens } 561fa9e4066Sahrens 562fa9e4066Sahrens return (zio); 563fa9e4066Sahrens } 564fa9e4066Sahrens 5650a4e9518Sgw static void 566e14bb325SJeff Bonwick zio_destroy(zio_t *zio) 5670a4e9518Sgw { 568a3f829aeSBill Moore list_destroy(&zio->io_parent_list); 569a3f829aeSBill Moore list_destroy(&zio->io_child_list); 570e14bb325SJeff Bonwick mutex_destroy(&zio->io_lock); 571e14bb325SJeff Bonwick cv_destroy(&zio->io_cv); 572e14bb325SJeff Bonwick kmem_cache_free(zio_cache, zio); 5730a4e9518Sgw } 5740a4e9518Sgw 575fa9e4066Sahrens zio_t * 576a3f829aeSBill Moore zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, 577b24ab676SJeff Bonwick void *private, enum zio_flag flags) 578fa9e4066Sahrens { 579fa9e4066Sahrens zio_t *zio; 580fa9e4066Sahrens 581fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 582a3f829aeSBill Moore ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 583e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); 584fa9e4066Sahrens 585fa9e4066Sahrens return (zio); 586fa9e4066Sahrens } 587fa9e4066Sahrens 588fa9e4066Sahrens zio_t * 589b24ab676SJeff Bonwick zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) 590fa9e4066Sahrens { 591a3f829aeSBill Moore return (zio_null(NULL, spa, NULL, done, private, flags)); 592fa9e4066Sahrens } 593fa9e4066Sahrens 594fa9e4066Sahrens zio_t * 595e14bb325SJeff Bonwick zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 596e14bb325SJeff Bonwick void *data, uint64_t size, zio_done_func_t *done, void *private, 597b24ab676SJeff Bonwick int priority, enum zio_flag flags, const zbookmark_t *zb) 598fa9e4066Sahrens { 599fa9e4066Sahrens zio_t *zio; 600fa9e4066Sahrens 601b24ab676SJeff Bonwick zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, 602088f3894Sahrens data, size, done, private, 603e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, NULL, 0, zb, 604b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 605b24ab676SJeff Bonwick ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); 606fa9e4066Sahrens 607fa9e4066Sahrens return (zio); 608fa9e4066Sahrens } 609fa9e4066Sahrens 610fa9e4066Sahrens zio_t * 611e14bb325SJeff Bonwick zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 612b24ab676SJeff Bonwick void *data, uint64_t size, const zio_prop_t *zp, 613e14bb325SJeff Bonwick zio_done_func_t *ready, zio_done_func_t *done, void *private, 614b24ab676SJeff Bonwick int priority, enum zio_flag flags, const zbookmark_t *zb) 615fa9e4066Sahrens { 616fa9e4066Sahrens zio_t *zio; 617fa9e4066Sahrens 618e14bb325SJeff Bonwick ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && 619e14bb325SJeff Bonwick zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && 620e14bb325SJeff Bonwick zp->zp_compress >= ZIO_COMPRESS_OFF && 621e14bb325SJeff Bonwick zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && 622e14bb325SJeff Bonwick zp->zp_type < DMU_OT_NUMTYPES && 623e14bb325SJeff Bonwick zp->zp_level < 32 && 624b24ab676SJeff Bonwick zp->zp_copies > 0 && 625b24ab676SJeff Bonwick zp->zp_copies <= spa_max_replication(spa) && 626b24ab676SJeff Bonwick zp->zp_dedup <= 1 && 627b24ab676SJeff Bonwick zp->zp_dedup_verify <= 1); 6280a4e9518Sgw 629fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 630e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 631b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 632b24ab676SJeff Bonwick ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); 633fa9e4066Sahrens 634c717a561Smaybee zio->io_ready = ready; 635e14bb325SJeff Bonwick zio->io_prop = *zp; 636fa9e4066Sahrens 637fa9e4066Sahrens return (zio); 638fa9e4066Sahrens } 639fa9e4066Sahrens 640fa9e4066Sahrens zio_t * 641e14bb325SJeff Bonwick zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, 642e14bb325SJeff Bonwick uint64_t size, zio_done_func_t *done, void *private, int priority, 643b24ab676SJeff Bonwick enum zio_flag flags, zbookmark_t *zb) 644fa9e4066Sahrens { 645fa9e4066Sahrens zio_t *zio; 646fa9e4066Sahrens 647fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 648e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 649e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); 650fa9e4066Sahrens 651fa9e4066Sahrens return (zio); 652fa9e4066Sahrens } 653fa9e4066Sahrens 654b24ab676SJeff Bonwick void 655b24ab676SJeff Bonwick zio_write_override(zio_t *zio, blkptr_t *bp, int copies) 656b24ab676SJeff Bonwick { 657b24ab676SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 658b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 659b24ab676SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 660b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); 661b24ab676SJeff Bonwick 662b24ab676SJeff Bonwick zio->io_prop.zp_copies = copies; 663b24ab676SJeff Bonwick zio->io_bp_override = bp; 664b24ab676SJeff Bonwick } 665b24ab676SJeff Bonwick 666b24ab676SJeff Bonwick void 667b24ab676SJeff Bonwick zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) 668b24ab676SJeff Bonwick { 669cde58dbcSMatthew Ahrens bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp); 670b24ab676SJeff Bonwick } 671b24ab676SJeff Bonwick 672fa9e4066Sahrens zio_t * 673b24ab676SJeff Bonwick zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 674b24ab676SJeff Bonwick enum zio_flag flags) 675fa9e4066Sahrens { 676fa9e4066Sahrens zio_t *zio; 677fa9e4066Sahrens 6783f9d6ad7SLin Ling dprintf_bp(bp, "freeing in txg %llu, pass %u", 6793f9d6ad7SLin Ling (longlong_t)txg, spa->spa_sync_pass); 6803f9d6ad7SLin Ling 681fa9e4066Sahrens ASSERT(!BP_IS_HOLE(bp)); 682b24ab676SJeff Bonwick ASSERT(spa_syncing_txg(spa) == txg); 683b24ab676SJeff Bonwick ASSERT(spa_sync_pass(spa) <= SYNC_PASS_DEFERRED_FREE); 684fa9e4066Sahrens 685e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 686b24ab676SJeff Bonwick NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, flags, 687e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_FREE_PIPELINE); 688fa9e4066Sahrens 689fa9e4066Sahrens return (zio); 690fa9e4066Sahrens } 691fa9e4066Sahrens 692fa9e4066Sahrens zio_t * 693b24ab676SJeff Bonwick zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 694b24ab676SJeff Bonwick zio_done_func_t *done, void *private, enum zio_flag flags) 695fa9e4066Sahrens { 696fa9e4066Sahrens zio_t *zio; 697fa9e4066Sahrens 698fa9e4066Sahrens /* 699fa9e4066Sahrens * A claim is an allocation of a specific block. Claims are needed 700fa9e4066Sahrens * to support immediate writes in the intent log. The issue is that 701fa9e4066Sahrens * immediate writes contain committed data, but in a txg that was 702fa9e4066Sahrens * *not* committed. Upon opening the pool after an unclean shutdown, 703fa9e4066Sahrens * the intent log claims all blocks that contain immediate write data 704fa9e4066Sahrens * so that the SPA knows they're in use. 705fa9e4066Sahrens * 706fa9e4066Sahrens * All claims *must* be resolved in the first txg -- before the SPA 707fa9e4066Sahrens * starts allocating blocks -- so that nothing is allocated twice. 708b24ab676SJeff Bonwick * If txg == 0 we just verify that the block is claimable. 709fa9e4066Sahrens */ 710fa9e4066Sahrens ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); 711b24ab676SJeff Bonwick ASSERT(txg == spa_first_txg(spa) || txg == 0); 712b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ 713fa9e4066Sahrens 714e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 715e14bb325SJeff Bonwick done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, 716e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); 717fa9e4066Sahrens 718fa9e4066Sahrens return (zio); 719fa9e4066Sahrens } 720fa9e4066Sahrens 721fa9e4066Sahrens zio_t * 722fa9e4066Sahrens zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 723b24ab676SJeff Bonwick zio_done_func_t *done, void *private, int priority, enum zio_flag flags) 724fa9e4066Sahrens { 725fa9e4066Sahrens zio_t *zio; 726fa9e4066Sahrens int c; 727fa9e4066Sahrens 728fa9e4066Sahrens if (vd->vdev_children == 0) { 729fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 730e14bb325SJeff Bonwick ZIO_TYPE_IOCTL, priority, flags, vd, 0, NULL, 731fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); 732fa9e4066Sahrens 733fa9e4066Sahrens zio->io_cmd = cmd; 734fa9e4066Sahrens } else { 735a3f829aeSBill Moore zio = zio_null(pio, spa, NULL, NULL, NULL, flags); 736fa9e4066Sahrens 737fa9e4066Sahrens for (c = 0; c < vd->vdev_children; c++) 738fa9e4066Sahrens zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, 739fa9e4066Sahrens done, private, priority, flags)); 740fa9e4066Sahrens } 741fa9e4066Sahrens 742fa9e4066Sahrens return (zio); 743fa9e4066Sahrens } 744fa9e4066Sahrens 745fa9e4066Sahrens zio_t * 746fa9e4066Sahrens zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 747fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 748b24ab676SJeff Bonwick int priority, enum zio_flag flags, boolean_t labels) 749fa9e4066Sahrens { 750fa9e4066Sahrens zio_t *zio; 7510a4e9518Sgw 752e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 753e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 754e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 755e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 756fa9e4066Sahrens 757e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 758e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, vd, offset, NULL, 759fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); 760fa9e4066Sahrens 761e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 762fa9e4066Sahrens 763fa9e4066Sahrens return (zio); 764fa9e4066Sahrens } 765fa9e4066Sahrens 766fa9e4066Sahrens zio_t * 767fa9e4066Sahrens zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 768fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 769b24ab676SJeff Bonwick int priority, enum zio_flag flags, boolean_t labels) 770fa9e4066Sahrens { 771fa9e4066Sahrens zio_t *zio; 7720a4e9518Sgw 773e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 774e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 775e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 776e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 777fa9e4066Sahrens 778e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 779e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL, 780fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); 781fa9e4066Sahrens 782e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 783fa9e4066Sahrens 7846e1f5caaSNeil Perrin if (zio_checksum_table[checksum].ci_eck) { 785fa9e4066Sahrens /* 7866e1f5caaSNeil Perrin * zec checksums are necessarily destructive -- they modify 787e14bb325SJeff Bonwick * the end of the write buffer to hold the verifier/checksum. 788fa9e4066Sahrens * Therefore, we must make a local copy in case the data is 789e14bb325SJeff Bonwick * being written to multiple places in parallel. 790fa9e4066Sahrens */ 791e14bb325SJeff Bonwick void *wbuf = zio_buf_alloc(size); 792fa9e4066Sahrens bcopy(data, wbuf, size); 793e14bb325SJeff Bonwick zio_push_transform(zio, wbuf, size, size, NULL); 794fa9e4066Sahrens } 795fa9e4066Sahrens 796fa9e4066Sahrens return (zio); 797fa9e4066Sahrens } 798fa9e4066Sahrens 799fa9e4066Sahrens /* 800e14bb325SJeff Bonwick * Create a child I/O to do some work for us. 801fa9e4066Sahrens */ 802fa9e4066Sahrens zio_t * 803e14bb325SJeff Bonwick zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, 804b24ab676SJeff Bonwick void *data, uint64_t size, int type, int priority, enum zio_flag flags, 805fa9e4066Sahrens zio_done_func_t *done, void *private) 806fa9e4066Sahrens { 807b24ab676SJeff Bonwick enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; 808e14bb325SJeff Bonwick zio_t *zio; 809e14bb325SJeff Bonwick 810e14bb325SJeff Bonwick ASSERT(vd->vdev_parent == 811e14bb325SJeff Bonwick (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); 812fa9e4066Sahrens 813fa9e4066Sahrens if (type == ZIO_TYPE_READ && bp != NULL) { 814fa9e4066Sahrens /* 815fa9e4066Sahrens * If we have the bp, then the child should perform the 816fa9e4066Sahrens * checksum and the parent need not. This pushes error 817fa9e4066Sahrens * detection as close to the leaves as possible and 818fa9e4066Sahrens * eliminates redundant checksums in the interior nodes. 819fa9e4066Sahrens */ 820b24ab676SJeff Bonwick pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; 821b24ab676SJeff Bonwick pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 822fa9e4066Sahrens } 823fa9e4066Sahrens 824e14bb325SJeff Bonwick if (vd->vdev_children == 0) 825e14bb325SJeff Bonwick offset += VDEV_LABEL_START_SIZE; 826e14bb325SJeff Bonwick 827b24ab676SJeff Bonwick flags |= ZIO_VDEV_CHILD_FLAGS(pio) | ZIO_FLAG_DONT_PROPAGATE; 828b24ab676SJeff Bonwick 829b24ab676SJeff Bonwick /* 830b24ab676SJeff Bonwick * If we've decided to do a repair, the write is not speculative -- 831b24ab676SJeff Bonwick * even if the original read was. 832b24ab676SJeff Bonwick */ 833b24ab676SJeff Bonwick if (flags & ZIO_FLAG_IO_REPAIR) 834b24ab676SJeff Bonwick flags &= ~ZIO_FLAG_SPECULATIVE; 835b24ab676SJeff Bonwick 836e14bb325SJeff Bonwick zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, 837b24ab676SJeff Bonwick done, private, type, priority, flags, vd, offset, &pio->io_bookmark, 838b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, pipeline); 839fa9e4066Sahrens 840e14bb325SJeff Bonwick return (zio); 84132b87932Sek } 84232b87932Sek 843e14bb325SJeff Bonwick zio_t * 844e14bb325SJeff Bonwick zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, 845b24ab676SJeff Bonwick int type, int priority, enum zio_flag flags, 846b24ab676SJeff Bonwick zio_done_func_t *done, void *private) 847fa9e4066Sahrens { 848e14bb325SJeff Bonwick zio_t *zio; 849fa9e4066Sahrens 850e14bb325SJeff Bonwick ASSERT(vd->vdev_ops->vdev_op_leaf); 851fa9e4066Sahrens 852e14bb325SJeff Bonwick zio = zio_create(NULL, vd->vdev_spa, 0, NULL, 853e14bb325SJeff Bonwick data, size, done, private, type, priority, 854e14bb325SJeff Bonwick flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY, 855e14bb325SJeff Bonwick vd, offset, NULL, 856b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); 857fa9e4066Sahrens 858e14bb325SJeff Bonwick return (zio); 859e05725b1Sbonwick } 860e05725b1Sbonwick 861e05725b1Sbonwick void 862e14bb325SJeff Bonwick zio_flush(zio_t *zio, vdev_t *vd) 863e05725b1Sbonwick { 864e14bb325SJeff Bonwick zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, 865e14bb325SJeff Bonwick NULL, NULL, ZIO_PRIORITY_NOW, 866e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); 867fa9e4066Sahrens } 868fa9e4066Sahrens 8696e1f5caaSNeil Perrin void 8706e1f5caaSNeil Perrin zio_shrink(zio_t *zio, uint64_t size) 8716e1f5caaSNeil Perrin { 8726e1f5caaSNeil Perrin ASSERT(zio->io_executor == NULL); 8736e1f5caaSNeil Perrin ASSERT(zio->io_orig_size == zio->io_size); 8746e1f5caaSNeil Perrin ASSERT(size <= zio->io_size); 8756e1f5caaSNeil Perrin 8766e1f5caaSNeil Perrin /* 8776e1f5caaSNeil Perrin * We don't shrink for raidz because of problems with the 8786e1f5caaSNeil Perrin * reconstruction when reading back less than the block size. 8796e1f5caaSNeil Perrin * Note, BP_IS_RAIDZ() assumes no compression. 8806e1f5caaSNeil Perrin */ 8816e1f5caaSNeil Perrin ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); 8826e1f5caaSNeil Perrin if (!BP_IS_RAIDZ(zio->io_bp)) 8836e1f5caaSNeil Perrin zio->io_orig_size = zio->io_size = size; 8846e1f5caaSNeil Perrin } 8856e1f5caaSNeil Perrin 886fa9e4066Sahrens /* 887fa9e4066Sahrens * ========================================================================== 888e14bb325SJeff Bonwick * Prepare to read and write logical blocks 889fa9e4066Sahrens * ========================================================================== 890fa9e4066Sahrens */ 891e14bb325SJeff Bonwick 892e05725b1Sbonwick static int 893e14bb325SJeff Bonwick zio_read_bp_init(zio_t *zio) 894fa9e4066Sahrens { 895e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 896e05725b1Sbonwick 89703361682SJeff Bonwick if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && 898f5383399SBill Moore zio->io_child_type == ZIO_CHILD_LOGICAL && 899f5383399SBill Moore !(zio->io_flags & ZIO_FLAG_RAW)) { 900b24ab676SJeff Bonwick uint64_t psize = BP_GET_PSIZE(bp); 901b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(psize); 902e05725b1Sbonwick 903b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, psize, zio_decompress); 904e14bb325SJeff Bonwick } 905fa9e4066Sahrens 906e14bb325SJeff Bonwick if (!dmu_ot[BP_GET_TYPE(bp)].ot_metadata && BP_GET_LEVEL(bp) == 0) 907e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 908fa9e4066Sahrens 909bbfd46c4SJeff Bonwick if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) 910bbfd46c4SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 911bbfd46c4SJeff Bonwick 912b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) 913b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_READ_PIPELINE; 914b24ab676SJeff Bonwick 915e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 916fa9e4066Sahrens } 917fa9e4066Sahrens 918e05725b1Sbonwick static int 919e14bb325SJeff Bonwick zio_write_bp_init(zio_t *zio) 9200a4e9518Sgw { 921b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 922e14bb325SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 923b24ab676SJeff Bonwick enum zio_compress compress = zp->zp_compress; 924e05725b1Sbonwick blkptr_t *bp = zio->io_bp; 925e14bb325SJeff Bonwick uint64_t lsize = zio->io_size; 926b24ab676SJeff Bonwick uint64_t psize = lsize; 927e14bb325SJeff Bonwick int pass = 1; 928e05725b1Sbonwick 929e14bb325SJeff Bonwick /* 930e14bb325SJeff Bonwick * If our children haven't all reached the ready stage, 931e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 932e14bb325SJeff Bonwick */ 933e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 934e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) 935e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 9360a4e9518Sgw 937e14bb325SJeff Bonwick if (!IO_IS_ALLOCATING(zio)) 938e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 9390a4e9518Sgw 940b24ab676SJeff Bonwick ASSERT(zio->io_child_type != ZIO_CHILD_DDT); 941b24ab676SJeff Bonwick 942b24ab676SJeff Bonwick if (zio->io_bp_override) { 943b24ab676SJeff Bonwick ASSERT(bp->blk_birth != zio->io_txg); 944b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); 945b24ab676SJeff Bonwick 946b24ab676SJeff Bonwick *bp = *zio->io_bp_override; 947b24ab676SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 948b24ab676SJeff Bonwick 949b24ab676SJeff Bonwick if (BP_IS_HOLE(bp) || !zp->zp_dedup) 950b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 951b24ab676SJeff Bonwick 952b24ab676SJeff Bonwick ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup || 953b24ab676SJeff Bonwick zp->zp_dedup_verify); 954b24ab676SJeff Bonwick 955b24ab676SJeff Bonwick if (BP_GET_CHECKSUM(bp) == zp->zp_checksum) { 956b24ab676SJeff Bonwick BP_SET_DEDUP(bp, 1); 957b24ab676SJeff Bonwick zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; 958b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 959b24ab676SJeff Bonwick } 960b24ab676SJeff Bonwick zio->io_bp_override = NULL; 961b24ab676SJeff Bonwick BP_ZERO(bp); 962b24ab676SJeff Bonwick } 9630a4e9518Sgw 964e14bb325SJeff Bonwick if (bp->blk_birth == zio->io_txg) { 965e14bb325SJeff Bonwick /* 966e14bb325SJeff Bonwick * We're rewriting an existing block, which means we're 967e14bb325SJeff Bonwick * working on behalf of spa_sync(). For spa_sync() to 968e14bb325SJeff Bonwick * converge, it must eventually be the case that we don't 969e14bb325SJeff Bonwick * have to allocate new blocks. But compression changes 970e14bb325SJeff Bonwick * the blocksize, which forces a reallocate, and makes 971e14bb325SJeff Bonwick * convergence take longer. Therefore, after the first 972e14bb325SJeff Bonwick * few passes, stop compressing to ensure convergence. 973e14bb325SJeff Bonwick */ 974b24ab676SJeff Bonwick pass = spa_sync_pass(spa); 975b24ab676SJeff Bonwick 976b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(spa)); 977b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 978b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp)); 979e05725b1Sbonwick 980e14bb325SJeff Bonwick if (pass > SYNC_PASS_DONT_COMPRESS) 981e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 982e05725b1Sbonwick 983e14bb325SJeff Bonwick /* Make sure someone doesn't change their mind on overwrites */ 984b24ab676SJeff Bonwick ASSERT(MIN(zp->zp_copies + BP_IS_GANG(bp), 985b24ab676SJeff Bonwick spa_max_replication(spa)) == BP_GET_NDVAS(bp)); 986e14bb325SJeff Bonwick } 987fa9e4066Sahrens 988e14bb325SJeff Bonwick if (compress != ZIO_COMPRESS_OFF) { 989b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(lsize); 990b24ab676SJeff Bonwick psize = zio_compress_data(compress, zio->io_data, cbuf, lsize); 991b24ab676SJeff Bonwick if (psize == 0 || psize == lsize) { 992e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 993b24ab676SJeff Bonwick zio_buf_free(cbuf, lsize); 994b24ab676SJeff Bonwick } else { 995b24ab676SJeff Bonwick ASSERT(psize < lsize); 996b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, lsize, NULL); 997e14bb325SJeff Bonwick } 998e14bb325SJeff Bonwick } 999c717a561Smaybee 1000e14bb325SJeff Bonwick /* 1001e14bb325SJeff Bonwick * The final pass of spa_sync() must be all rewrites, but the first 1002e14bb325SJeff Bonwick * few passes offer a trade-off: allocating blocks defers convergence, 1003e14bb325SJeff Bonwick * but newly allocated blocks are sequential, so they can be written 1004e14bb325SJeff Bonwick * to disk faster. Therefore, we allow the first few passes of 1005e14bb325SJeff Bonwick * spa_sync() to allocate new blocks, but force rewrites after that. 1006e14bb325SJeff Bonwick * There should only be a handful of blocks after pass 1 in any case. 1007e14bb325SJeff Bonwick */ 1008b24ab676SJeff Bonwick if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == psize && 1009e14bb325SJeff Bonwick pass > SYNC_PASS_REWRITE) { 1010b24ab676SJeff Bonwick ASSERT(psize != 0); 1011b24ab676SJeff Bonwick enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; 1012e14bb325SJeff Bonwick zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; 1013e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_REWRITE; 1014e14bb325SJeff Bonwick } else { 1015e14bb325SJeff Bonwick BP_ZERO(bp); 1016e14bb325SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 1017e14bb325SJeff Bonwick } 1018fa9e4066Sahrens 1019b24ab676SJeff Bonwick if (psize == 0) { 1020e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1021e14bb325SJeff Bonwick } else { 1022e14bb325SJeff Bonwick ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); 1023e14bb325SJeff Bonwick BP_SET_LSIZE(bp, lsize); 1024b24ab676SJeff Bonwick BP_SET_PSIZE(bp, psize); 1025e14bb325SJeff Bonwick BP_SET_COMPRESS(bp, compress); 1026e14bb325SJeff Bonwick BP_SET_CHECKSUM(bp, zp->zp_checksum); 1027e14bb325SJeff Bonwick BP_SET_TYPE(bp, zp->zp_type); 1028e14bb325SJeff Bonwick BP_SET_LEVEL(bp, zp->zp_level); 1029b24ab676SJeff Bonwick BP_SET_DEDUP(bp, zp->zp_dedup); 1030e14bb325SJeff Bonwick BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 1031b24ab676SJeff Bonwick if (zp->zp_dedup) { 1032b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1033b24ab676SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 1034b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; 1035b24ab676SJeff Bonwick } 1036b24ab676SJeff Bonwick } 1037b24ab676SJeff Bonwick 1038b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1039b24ab676SJeff Bonwick } 1040b24ab676SJeff Bonwick 1041b24ab676SJeff Bonwick static int 1042b24ab676SJeff Bonwick zio_free_bp_init(zio_t *zio) 1043b24ab676SJeff Bonwick { 1044b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1045b24ab676SJeff Bonwick 1046b24ab676SJeff Bonwick if (zio->io_child_type == ZIO_CHILD_LOGICAL) { 1047b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp)) 1048b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; 1049e14bb325SJeff Bonwick } 1050fa9e4066Sahrens 1051e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1052fa9e4066Sahrens } 1053fa9e4066Sahrens 1054e14bb325SJeff Bonwick /* 1055e14bb325SJeff Bonwick * ========================================================================== 1056e14bb325SJeff Bonwick * Execute the I/O pipeline 1057e14bb325SJeff Bonwick * ========================================================================== 1058e14bb325SJeff Bonwick */ 1059e14bb325SJeff Bonwick 1060e14bb325SJeff Bonwick static void 106135a5a358SJonathan Adams zio_taskq_dispatch(zio_t *zio, enum zio_taskq_type q, boolean_t cutinline) 1062fa9e4066Sahrens { 106380eb36f2SGeorge Wilson spa_t *spa = zio->io_spa; 1064e14bb325SJeff Bonwick zio_type_t t = zio->io_type; 1065*5aeb9474SGarrett D'Amore int flags = (cutinline ? TQ_FRONT : 0); 10660a4e9518Sgw 10670a4e9518Sgw /* 1068bbe36defSGeorge Wilson * If we're a config writer or a probe, the normal issue and 1069bbe36defSGeorge Wilson * interrupt threads may all be blocked waiting for the config lock. 1070bbe36defSGeorge Wilson * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. 10710a4e9518Sgw */ 1072bbe36defSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) 1073e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 10740a4e9518Sgw 10750a4e9518Sgw /* 1076e14bb325SJeff Bonwick * A similar issue exists for the L2ARC write thread until L2ARC 2.0. 10770a4e9518Sgw */ 1078e14bb325SJeff Bonwick if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) 1079e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 10800a4e9518Sgw 108180eb36f2SGeorge Wilson /* 108280eb36f2SGeorge Wilson * If this is a high priority I/O, then use the high priority taskq. 108380eb36f2SGeorge Wilson */ 108480eb36f2SGeorge Wilson if (zio->io_priority == ZIO_PRIORITY_NOW && 108580eb36f2SGeorge Wilson spa->spa_zio_taskq[t][q + 1] != NULL) 108680eb36f2SGeorge Wilson q++; 108780eb36f2SGeorge Wilson 108880eb36f2SGeorge Wilson ASSERT3U(q, <, ZIO_TASKQ_TYPES); 1089*5aeb9474SGarrett D'Amore 1090*5aeb9474SGarrett D'Amore /* 1091*5aeb9474SGarrett D'Amore * NB: We are assuming that the zio can only be dispatched 1092*5aeb9474SGarrett D'Amore * to a single taskq at a time. It would be a grievous error 1093*5aeb9474SGarrett D'Amore * to dispatch the zio to another taskq at the same time. 1094*5aeb9474SGarrett D'Amore */ 1095*5aeb9474SGarrett D'Amore ASSERT(zio->io_tqent.tqent_next == NULL); 1096*5aeb9474SGarrett D'Amore taskq_dispatch_ent(spa->spa_zio_taskq[t][q], 1097*5aeb9474SGarrett D'Amore (task_func_t *)zio_execute, zio, flags, &zio->io_tqent); 1098e14bb325SJeff Bonwick } 10990a4e9518Sgw 1100e14bb325SJeff Bonwick static boolean_t 1101e14bb325SJeff Bonwick zio_taskq_member(zio_t *zio, enum zio_taskq_type q) 1102e14bb325SJeff Bonwick { 1103e14bb325SJeff Bonwick kthread_t *executor = zio->io_executor; 1104e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 11050a4e9518Sgw 1106e14bb325SJeff Bonwick for (zio_type_t t = 0; t < ZIO_TYPES; t++) 1107e14bb325SJeff Bonwick if (taskq_member(spa->spa_zio_taskq[t][q], executor)) 1108e14bb325SJeff Bonwick return (B_TRUE); 11090a4e9518Sgw 1110e14bb325SJeff Bonwick return (B_FALSE); 1111e14bb325SJeff Bonwick } 1112e05725b1Sbonwick 1113e14bb325SJeff Bonwick static int 1114e14bb325SJeff Bonwick zio_issue_async(zio_t *zio) 1115e14bb325SJeff Bonwick { 111635a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 1117e14bb325SJeff Bonwick 1118e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 11190a4e9518Sgw } 11200a4e9518Sgw 1121e14bb325SJeff Bonwick void 1122e14bb325SJeff Bonwick zio_interrupt(zio_t *zio) 11230a4e9518Sgw { 112435a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE); 1125e14bb325SJeff Bonwick } 11260a4e9518Sgw 1127e14bb325SJeff Bonwick /* 1128e14bb325SJeff Bonwick * Execute the I/O pipeline until one of the following occurs: 1129e14bb325SJeff Bonwick * (1) the I/O completes; (2) the pipeline stalls waiting for 1130e14bb325SJeff Bonwick * dependent child I/Os; (3) the I/O issues, so we're waiting 1131e14bb325SJeff Bonwick * for an I/O completion interrupt; (4) the I/O is delegated by 1132e14bb325SJeff Bonwick * vdev-level caching or aggregation; (5) the I/O is deferred 1133e14bb325SJeff Bonwick * due to vdev-level queueing; (6) the I/O is handed off to 1134e14bb325SJeff Bonwick * another thread. In all cases, the pipeline stops whenever 1135e14bb325SJeff Bonwick * there's no CPU work; it never burns a thread in cv_wait(). 1136e14bb325SJeff Bonwick * 1137e14bb325SJeff Bonwick * There's no locking on io_stage because there's no legitimate way 1138e14bb325SJeff Bonwick * for multiple threads to be attempting to process the same I/O. 1139e14bb325SJeff Bonwick */ 1140b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[]; 11410a4e9518Sgw 1142e14bb325SJeff Bonwick void 1143e14bb325SJeff Bonwick zio_execute(zio_t *zio) 1144e14bb325SJeff Bonwick { 1145e14bb325SJeff Bonwick zio->io_executor = curthread; 11460a4e9518Sgw 1147e14bb325SJeff Bonwick while (zio->io_stage < ZIO_STAGE_DONE) { 1148b24ab676SJeff Bonwick enum zio_stage pipeline = zio->io_pipeline; 1149b24ab676SJeff Bonwick enum zio_stage stage = zio->io_stage; 1150e14bb325SJeff Bonwick int rv; 11510a4e9518Sgw 1152e14bb325SJeff Bonwick ASSERT(!MUTEX_HELD(&zio->io_lock)); 1153b24ab676SJeff Bonwick ASSERT(ISP2(stage)); 1154b24ab676SJeff Bonwick ASSERT(zio->io_stall == NULL); 11550a4e9518Sgw 1156b24ab676SJeff Bonwick do { 1157b24ab676SJeff Bonwick stage <<= 1; 1158b24ab676SJeff Bonwick } while ((stage & pipeline) == 0); 1159e14bb325SJeff Bonwick 1160e14bb325SJeff Bonwick ASSERT(stage <= ZIO_STAGE_DONE); 11610a4e9518Sgw 11620a4e9518Sgw /* 1163e14bb325SJeff Bonwick * If we are in interrupt context and this pipeline stage 1164e14bb325SJeff Bonwick * will grab a config lock that is held across I/O, 1165b24ab676SJeff Bonwick * or may wait for an I/O that needs an interrupt thread 1166b24ab676SJeff Bonwick * to complete, issue async to avoid deadlock. 116735a5a358SJonathan Adams * 116835a5a358SJonathan Adams * For VDEV_IO_START, we cut in line so that the io will 116935a5a358SJonathan Adams * be sent to disk promptly. 11700a4e9518Sgw */ 1171b24ab676SJeff Bonwick if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && 1172e14bb325SJeff Bonwick zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { 117335a5a358SJonathan Adams boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ? 117435a5a358SJonathan Adams zio_requeue_io_start_cut_in_line : B_FALSE; 117535a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); 1176e14bb325SJeff Bonwick return; 11770a4e9518Sgw } 11780a4e9518Sgw 1179e14bb325SJeff Bonwick zio->io_stage = stage; 1180b24ab676SJeff Bonwick rv = zio_pipeline[highbit(stage) - 1](zio); 11810a4e9518Sgw 1182e14bb325SJeff Bonwick if (rv == ZIO_PIPELINE_STOP) 1183e14bb325SJeff Bonwick return; 11840a4e9518Sgw 1185e14bb325SJeff Bonwick ASSERT(rv == ZIO_PIPELINE_CONTINUE); 1186e14bb325SJeff Bonwick } 11870a4e9518Sgw } 11880a4e9518Sgw 1189e14bb325SJeff Bonwick /* 1190e14bb325SJeff Bonwick * ========================================================================== 1191e14bb325SJeff Bonwick * Initiate I/O, either sync or async 1192e14bb325SJeff Bonwick * ========================================================================== 1193e14bb325SJeff Bonwick */ 1194e14bb325SJeff Bonwick int 1195e14bb325SJeff Bonwick zio_wait(zio_t *zio) 11960a4e9518Sgw { 1197e14bb325SJeff Bonwick int error; 11980a4e9518Sgw 1199e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 1200e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 12010a4e9518Sgw 1202e14bb325SJeff Bonwick zio->io_waiter = curthread; 1203e05725b1Sbonwick 1204e14bb325SJeff Bonwick zio_execute(zio); 12050a4e9518Sgw 1206e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 1207e14bb325SJeff Bonwick while (zio->io_executor != NULL) 1208e14bb325SJeff Bonwick cv_wait(&zio->io_cv, &zio->io_lock); 1209e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 121032b87932Sek 1211e14bb325SJeff Bonwick error = zio->io_error; 1212e14bb325SJeff Bonwick zio_destroy(zio); 121332b87932Sek 1214e14bb325SJeff Bonwick return (error); 121532b87932Sek } 121632b87932Sek 1217e14bb325SJeff Bonwick void 1218e14bb325SJeff Bonwick zio_nowait(zio_t *zio) 12190a4e9518Sgw { 1220e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 1221fa9e4066Sahrens 1222a3f829aeSBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL && 1223a3f829aeSBill Moore zio_unique_parent(zio) == NULL) { 1224ea8dc4b6Seschrock /* 1225e14bb325SJeff Bonwick * This is a logical async I/O with no parent to wait for it. 122654d692b7SGeorge Wilson * We add it to the spa_async_root_zio "Godfather" I/O which 122754d692b7SGeorge Wilson * will ensure they complete prior to unloading the pool. 1228ea8dc4b6Seschrock */ 1229e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 123054d692b7SGeorge Wilson 123154d692b7SGeorge Wilson zio_add_child(spa->spa_async_zio_root, zio); 1232e14bb325SJeff Bonwick } 1233ea8dc4b6Seschrock 1234e14bb325SJeff Bonwick zio_execute(zio); 1235e14bb325SJeff Bonwick } 1236ea8dc4b6Seschrock 1237e14bb325SJeff Bonwick /* 1238e14bb325SJeff Bonwick * ========================================================================== 1239e14bb325SJeff Bonwick * Reexecute or suspend/resume failed I/O 1240e14bb325SJeff Bonwick * ========================================================================== 1241e14bb325SJeff Bonwick */ 1242fa9e4066Sahrens 1243e14bb325SJeff Bonwick static void 1244e14bb325SJeff Bonwick zio_reexecute(zio_t *pio) 1245e14bb325SJeff Bonwick { 1246a3f829aeSBill Moore zio_t *cio, *cio_next; 1247a3f829aeSBill Moore 1248a3f829aeSBill Moore ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); 1249a3f829aeSBill Moore ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); 1250f5383399SBill Moore ASSERT(pio->io_gang_leader == NULL); 1251f5383399SBill Moore ASSERT(pio->io_gang_tree == NULL); 1252e05725b1Sbonwick 1253e14bb325SJeff Bonwick pio->io_flags = pio->io_orig_flags; 1254e14bb325SJeff Bonwick pio->io_stage = pio->io_orig_stage; 1255e14bb325SJeff Bonwick pio->io_pipeline = pio->io_orig_pipeline; 1256e14bb325SJeff Bonwick pio->io_reexecute = 0; 1257e14bb325SJeff Bonwick pio->io_error = 0; 1258a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1259a3f829aeSBill Moore pio->io_state[w] = 0; 1260e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 1261e14bb325SJeff Bonwick pio->io_child_error[c] = 0; 12620a4e9518Sgw 1263b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(pio)) 1264b24ab676SJeff Bonwick BP_ZERO(pio->io_bp); 1265d58459f4Sek 1266e14bb325SJeff Bonwick /* 1267e14bb325SJeff Bonwick * As we reexecute pio's children, new children could be created. 1268a3f829aeSBill Moore * New children go to the head of pio's io_child_list, however, 1269e14bb325SJeff Bonwick * so we will (correctly) not reexecute them. The key is that 1270a3f829aeSBill Moore * the remainder of pio's io_child_list, from 'cio_next' onward, 1271a3f829aeSBill Moore * cannot be affected by any side effects of reexecuting 'cio'. 1272e14bb325SJeff Bonwick */ 1273a3f829aeSBill Moore for (cio = zio_walk_children(pio); cio != NULL; cio = cio_next) { 1274a3f829aeSBill Moore cio_next = zio_walk_children(pio); 1275e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 1276a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1277a3f829aeSBill Moore pio->io_children[cio->io_child_type][w]++; 1278e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 1279a3f829aeSBill Moore zio_reexecute(cio); 1280fa9e4066Sahrens } 1281e05725b1Sbonwick 1282e14bb325SJeff Bonwick /* 1283e14bb325SJeff Bonwick * Now that all children have been reexecuted, execute the parent. 128454d692b7SGeorge Wilson * We don't reexecute "The Godfather" I/O here as it's the 128554d692b7SGeorge Wilson * responsibility of the caller to wait on him. 1286e14bb325SJeff Bonwick */ 128754d692b7SGeorge Wilson if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) 128854d692b7SGeorge Wilson zio_execute(pio); 12890a4e9518Sgw } 12900a4e9518Sgw 1291e14bb325SJeff Bonwick void 1292e14bb325SJeff Bonwick zio_suspend(spa_t *spa, zio_t *zio) 12930a4e9518Sgw { 1294e14bb325SJeff Bonwick if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) 1295e14bb325SJeff Bonwick fm_panic("Pool '%s' has encountered an uncorrectable I/O " 1296e14bb325SJeff Bonwick "failure and the failure mode property for this pool " 1297e14bb325SJeff Bonwick "is set to panic.", spa_name(spa)); 12980a4e9518Sgw 1299e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); 13000a4e9518Sgw 1301e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1302fa9e4066Sahrens 1303e14bb325SJeff Bonwick if (spa->spa_suspend_zio_root == NULL) 130454d692b7SGeorge Wilson spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, 130554d692b7SGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 130654d692b7SGeorge Wilson ZIO_FLAG_GODFATHER); 1307fa9e4066Sahrens 1308e14bb325SJeff Bonwick spa->spa_suspended = B_TRUE; 1309fa9e4066Sahrens 1310e14bb325SJeff Bonwick if (zio != NULL) { 131154d692b7SGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 1312e14bb325SJeff Bonwick ASSERT(zio != spa->spa_suspend_zio_root); 1313e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1314a3f829aeSBill Moore ASSERT(zio_unique_parent(zio) == NULL); 1315e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_DONE); 1316e14bb325SJeff Bonwick zio_add_child(spa->spa_suspend_zio_root, zio); 1317e14bb325SJeff Bonwick } 1318fa9e4066Sahrens 1319e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1320e14bb325SJeff Bonwick } 1321fa9e4066Sahrens 132254d692b7SGeorge Wilson int 1323e14bb325SJeff Bonwick zio_resume(spa_t *spa) 1324e14bb325SJeff Bonwick { 132554d692b7SGeorge Wilson zio_t *pio; 1326fa9e4066Sahrens 1327b3995adbSahrens /* 1328e14bb325SJeff Bonwick * Reexecute all previously suspended i/o. 1329b3995adbSahrens */ 1330e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1331e14bb325SJeff Bonwick spa->spa_suspended = B_FALSE; 1332e14bb325SJeff Bonwick cv_broadcast(&spa->spa_suspend_cv); 1333e14bb325SJeff Bonwick pio = spa->spa_suspend_zio_root; 1334e14bb325SJeff Bonwick spa->spa_suspend_zio_root = NULL; 1335e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1336e14bb325SJeff Bonwick 1337e14bb325SJeff Bonwick if (pio == NULL) 133854d692b7SGeorge Wilson return (0); 1339e14bb325SJeff Bonwick 134054d692b7SGeorge Wilson zio_reexecute(pio); 134154d692b7SGeorge Wilson return (zio_wait(pio)); 1342e14bb325SJeff Bonwick } 1343e14bb325SJeff Bonwick 1344e14bb325SJeff Bonwick void 1345e14bb325SJeff Bonwick zio_resume_wait(spa_t *spa) 1346e14bb325SJeff Bonwick { 1347e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1348e14bb325SJeff Bonwick while (spa_suspended(spa)) 1349e14bb325SJeff Bonwick cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); 1350e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1351fa9e4066Sahrens } 1352fa9e4066Sahrens 1353fa9e4066Sahrens /* 1354fa9e4066Sahrens * ========================================================================== 1355e14bb325SJeff Bonwick * Gang blocks. 1356e14bb325SJeff Bonwick * 1357e14bb325SJeff Bonwick * A gang block is a collection of small blocks that looks to the DMU 1358e14bb325SJeff Bonwick * like one large block. When zio_dva_allocate() cannot find a block 1359e14bb325SJeff Bonwick * of the requested size, due to either severe fragmentation or the pool 1360e14bb325SJeff Bonwick * being nearly full, it calls zio_write_gang_block() to construct the 1361e14bb325SJeff Bonwick * block from smaller fragments. 1362e14bb325SJeff Bonwick * 1363e14bb325SJeff Bonwick * A gang block consists of a gang header (zio_gbh_phys_t) and up to 1364e14bb325SJeff Bonwick * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like 1365e14bb325SJeff Bonwick * an indirect block: it's an array of block pointers. It consumes 1366e14bb325SJeff Bonwick * only one sector and hence is allocatable regardless of fragmentation. 1367e14bb325SJeff Bonwick * The gang header's bps point to its gang members, which hold the data. 1368e14bb325SJeff Bonwick * 1369e14bb325SJeff Bonwick * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> 1370e14bb325SJeff Bonwick * as the verifier to ensure uniqueness of the SHA256 checksum. 1371e14bb325SJeff Bonwick * Critically, the gang block bp's blk_cksum is the checksum of the data, 1372e14bb325SJeff Bonwick * not the gang header. This ensures that data block signatures (needed for 1373e14bb325SJeff Bonwick * deduplication) are independent of how the block is physically stored. 1374e14bb325SJeff Bonwick * 1375e14bb325SJeff Bonwick * Gang blocks can be nested: a gang member may itself be a gang block. 1376e14bb325SJeff Bonwick * Thus every gang block is a tree in which root and all interior nodes are 1377e14bb325SJeff Bonwick * gang headers, and the leaves are normal blocks that contain user data. 1378e14bb325SJeff Bonwick * The root of the gang tree is called the gang leader. 1379e14bb325SJeff Bonwick * 1380e14bb325SJeff Bonwick * To perform any operation (read, rewrite, free, claim) on a gang block, 1381e14bb325SJeff Bonwick * zio_gang_assemble() first assembles the gang tree (minus data leaves) 1382e14bb325SJeff Bonwick * in the io_gang_tree field of the original logical i/o by recursively 1383e14bb325SJeff Bonwick * reading the gang leader and all gang headers below it. This yields 1384e14bb325SJeff Bonwick * an in-core tree containing the contents of every gang header and the 1385e14bb325SJeff Bonwick * bps for every constituent of the gang block. 1386e14bb325SJeff Bonwick * 1387e14bb325SJeff Bonwick * With the gang tree now assembled, zio_gang_issue() just walks the gang tree 1388e14bb325SJeff Bonwick * and invokes a callback on each bp. To free a gang block, zio_gang_issue() 1389e14bb325SJeff Bonwick * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. 1390e14bb325SJeff Bonwick * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). 1391e14bb325SJeff Bonwick * zio_read_gang() is a wrapper around zio_read() that omits reading gang 1392e14bb325SJeff Bonwick * headers, since we already have those in io_gang_tree. zio_rewrite_gang() 1393e14bb325SJeff Bonwick * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() 1394e14bb325SJeff Bonwick * of the gang header plus zio_checksum_compute() of the data to update the 1395e14bb325SJeff Bonwick * gang header's blk_cksum as described above. 1396e14bb325SJeff Bonwick * 1397e14bb325SJeff Bonwick * The two-phase assemble/issue model solves the problem of partial failure -- 1398e14bb325SJeff Bonwick * what if you'd freed part of a gang block but then couldn't read the 1399e14bb325SJeff Bonwick * gang header for another part? Assembling the entire gang tree first 1400e14bb325SJeff Bonwick * ensures that all the necessary gang header I/O has succeeded before 1401e14bb325SJeff Bonwick * starting the actual work of free, claim, or write. Once the gang tree 1402e14bb325SJeff Bonwick * is assembled, free and claim are in-memory operations that cannot fail. 1403e14bb325SJeff Bonwick * 1404e14bb325SJeff Bonwick * In the event that a gang write fails, zio_dva_unallocate() walks the 1405e14bb325SJeff Bonwick * gang tree to immediately free (i.e. insert back into the space map) 1406e14bb325SJeff Bonwick * everything we've allocated. This ensures that we don't get ENOSPC 1407e14bb325SJeff Bonwick * errors during repeated suspend/resume cycles due to a flaky device. 1408e14bb325SJeff Bonwick * 1409e14bb325SJeff Bonwick * Gang rewrites only happen during sync-to-convergence. If we can't assemble 1410e14bb325SJeff Bonwick * the gang tree, we won't modify the block, so we can safely defer the free 1411e14bb325SJeff Bonwick * (knowing that the block is still intact). If we *can* assemble the gang 1412e14bb325SJeff Bonwick * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free 1413e14bb325SJeff Bonwick * each constituent bp and we can allocate a new block on the next sync pass. 1414e14bb325SJeff Bonwick * 1415e14bb325SJeff Bonwick * In all cases, the gang tree allows complete recovery from partial failure. 1416fa9e4066Sahrens * ========================================================================== 1417fa9e4066Sahrens */ 1418e14bb325SJeff Bonwick 1419e14bb325SJeff Bonwick static zio_t * 1420e14bb325SJeff Bonwick zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1421fa9e4066Sahrens { 1422e14bb325SJeff Bonwick if (gn != NULL) 1423e14bb325SJeff Bonwick return (pio); 1424fa9e4066Sahrens 1425e14bb325SJeff Bonwick return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), 1426e14bb325SJeff Bonwick NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1427e14bb325SJeff Bonwick &pio->io_bookmark)); 1428e14bb325SJeff Bonwick } 1429e14bb325SJeff Bonwick 1430e14bb325SJeff Bonwick zio_t * 1431e14bb325SJeff Bonwick zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1432e14bb325SJeff Bonwick { 1433e14bb325SJeff Bonwick zio_t *zio; 1434e14bb325SJeff Bonwick 1435e14bb325SJeff Bonwick if (gn != NULL) { 1436e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1437e14bb325SJeff Bonwick gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, 1438e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1439fa9e4066Sahrens /* 1440e14bb325SJeff Bonwick * As we rewrite each gang header, the pipeline will compute 1441e14bb325SJeff Bonwick * a new gang block header checksum for it; but no one will 1442e14bb325SJeff Bonwick * compute a new data checksum, so we do that here. The one 1443e14bb325SJeff Bonwick * exception is the gang leader: the pipeline already computed 1444e14bb325SJeff Bonwick * its data checksum because that stage precedes gang assembly. 1445e14bb325SJeff Bonwick * (Presently, nothing actually uses interior data checksums; 1446e14bb325SJeff Bonwick * this is just good hygiene.) 1447fa9e4066Sahrens */ 1448f5383399SBill Moore if (gn != pio->io_gang_leader->io_gang_tree) { 1449e14bb325SJeff Bonwick zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), 1450e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp)); 1451e14bb325SJeff Bonwick } 1452b24ab676SJeff Bonwick /* 1453b24ab676SJeff Bonwick * If we are here to damage data for testing purposes, 1454b24ab676SJeff Bonwick * leave the GBH alone so that we can detect the damage. 1455b24ab676SJeff Bonwick */ 1456b24ab676SJeff Bonwick if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) 1457b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 1458fa9e4066Sahrens } else { 1459e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1460e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, 1461e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1462fa9e4066Sahrens } 1463fa9e4066Sahrens 1464e14bb325SJeff Bonwick return (zio); 1465e14bb325SJeff Bonwick } 1466fa9e4066Sahrens 1467e14bb325SJeff Bonwick /* ARGSUSED */ 1468e14bb325SJeff Bonwick zio_t * 1469e14bb325SJeff Bonwick zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1470e14bb325SJeff Bonwick { 1471b24ab676SJeff Bonwick return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, 1472b24ab676SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio))); 1473fa9e4066Sahrens } 1474fa9e4066Sahrens 1475e14bb325SJeff Bonwick /* ARGSUSED */ 1476e14bb325SJeff Bonwick zio_t * 1477e14bb325SJeff Bonwick zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1478fa9e4066Sahrens { 1479e14bb325SJeff Bonwick return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, 1480e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 1481e14bb325SJeff Bonwick } 1482fa9e4066Sahrens 1483e14bb325SJeff Bonwick static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { 1484e14bb325SJeff Bonwick NULL, 1485e14bb325SJeff Bonwick zio_read_gang, 1486e14bb325SJeff Bonwick zio_rewrite_gang, 1487e14bb325SJeff Bonwick zio_free_gang, 1488e14bb325SJeff Bonwick zio_claim_gang, 1489e14bb325SJeff Bonwick NULL 1490e14bb325SJeff Bonwick }; 1491fa9e4066Sahrens 1492e14bb325SJeff Bonwick static void zio_gang_tree_assemble_done(zio_t *zio); 1493fa9e4066Sahrens 1494e14bb325SJeff Bonwick static zio_gang_node_t * 1495e14bb325SJeff Bonwick zio_gang_node_alloc(zio_gang_node_t **gnpp) 1496e14bb325SJeff Bonwick { 1497e14bb325SJeff Bonwick zio_gang_node_t *gn; 1498fa9e4066Sahrens 1499e14bb325SJeff Bonwick ASSERT(*gnpp == NULL); 1500fa9e4066Sahrens 1501e14bb325SJeff Bonwick gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); 1502e14bb325SJeff Bonwick gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); 1503e14bb325SJeff Bonwick *gnpp = gn; 1504e14bb325SJeff Bonwick 1505e14bb325SJeff Bonwick return (gn); 1506fa9e4066Sahrens } 1507fa9e4066Sahrens 1508fa9e4066Sahrens static void 1509e14bb325SJeff Bonwick zio_gang_node_free(zio_gang_node_t **gnpp) 1510fa9e4066Sahrens { 1511e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1512fa9e4066Sahrens 1513e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1514e14bb325SJeff Bonwick ASSERT(gn->gn_child[g] == NULL); 1515e14bb325SJeff Bonwick 1516e14bb325SJeff Bonwick zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); 1517e14bb325SJeff Bonwick kmem_free(gn, sizeof (*gn)); 1518e14bb325SJeff Bonwick *gnpp = NULL; 1519fa9e4066Sahrens } 1520fa9e4066Sahrens 1521e14bb325SJeff Bonwick static void 1522e14bb325SJeff Bonwick zio_gang_tree_free(zio_gang_node_t **gnpp) 1523fa9e4066Sahrens { 1524e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1525fa9e4066Sahrens 1526e14bb325SJeff Bonwick if (gn == NULL) 1527e14bb325SJeff Bonwick return; 1528fa9e4066Sahrens 1529e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1530e14bb325SJeff Bonwick zio_gang_tree_free(&gn->gn_child[g]); 1531fa9e4066Sahrens 1532e14bb325SJeff Bonwick zio_gang_node_free(gnpp); 1533fa9e4066Sahrens } 1534fa9e4066Sahrens 1535e14bb325SJeff Bonwick static void 1536f5383399SBill Moore zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) 1537fa9e4066Sahrens { 1538e14bb325SJeff Bonwick zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); 1539e14bb325SJeff Bonwick 1540f5383399SBill Moore ASSERT(gio->io_gang_leader == gio); 1541e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp)); 1542fa9e4066Sahrens 1543f5383399SBill Moore zio_nowait(zio_read(gio, gio->io_spa, bp, gn->gn_gbh, 1544e14bb325SJeff Bonwick SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, 1545f5383399SBill Moore gio->io_priority, ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); 1546e14bb325SJeff Bonwick } 1547fa9e4066Sahrens 1548e14bb325SJeff Bonwick static void 1549e14bb325SJeff Bonwick zio_gang_tree_assemble_done(zio_t *zio) 1550e14bb325SJeff Bonwick { 1551f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 1552e14bb325SJeff Bonwick zio_gang_node_t *gn = zio->io_private; 1553e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1554fa9e4066Sahrens 1555f5383399SBill Moore ASSERT(gio == zio_unique_parent(zio)); 1556b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 1557fa9e4066Sahrens 1558e14bb325SJeff Bonwick if (zio->io_error) 1559e14bb325SJeff Bonwick return; 1560fa9e4066Sahrens 1561e14bb325SJeff Bonwick if (BP_SHOULD_BYTESWAP(bp)) 1562e14bb325SJeff Bonwick byteswap_uint64_array(zio->io_data, zio->io_size); 1563fa9e4066Sahrens 1564e14bb325SJeff Bonwick ASSERT(zio->io_data == gn->gn_gbh); 1565e14bb325SJeff Bonwick ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); 15666e1f5caaSNeil Perrin ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); 1567e05725b1Sbonwick 1568e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1569e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1570e14bb325SJeff Bonwick if (!BP_IS_GANG(gbp)) 1571e14bb325SJeff Bonwick continue; 1572f5383399SBill Moore zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); 1573e14bb325SJeff Bonwick } 1574fa9e4066Sahrens } 1575fa9e4066Sahrens 1576e14bb325SJeff Bonwick static void 1577e14bb325SJeff Bonwick zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) 1578fa9e4066Sahrens { 1579f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1580e14bb325SJeff Bonwick zio_t *zio; 1581fa9e4066Sahrens 1582e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) == !!gn); 1583f5383399SBill Moore ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); 1584f5383399SBill Moore ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); 1585fa9e4066Sahrens 1586e14bb325SJeff Bonwick /* 1587e14bb325SJeff Bonwick * If you're a gang header, your data is in gn->gn_gbh. 1588e14bb325SJeff Bonwick * If you're a gang member, your data is in 'data' and gn == NULL. 1589e14bb325SJeff Bonwick */ 1590f5383399SBill Moore zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data); 1591fa9e4066Sahrens 1592e14bb325SJeff Bonwick if (gn != NULL) { 15936e1f5caaSNeil Perrin ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); 1594fa9e4066Sahrens 1595e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1596e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1597e14bb325SJeff Bonwick if (BP_IS_HOLE(gbp)) 1598e14bb325SJeff Bonwick continue; 1599e14bb325SJeff Bonwick zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); 1600e14bb325SJeff Bonwick data = (char *)data + BP_GET_PSIZE(gbp); 1601e14bb325SJeff Bonwick } 1602fa9e4066Sahrens } 1603fa9e4066Sahrens 1604f5383399SBill Moore if (gn == gio->io_gang_tree) 1605f5383399SBill Moore ASSERT3P((char *)gio->io_data + gio->io_size, ==, data); 1606e05725b1Sbonwick 1607e14bb325SJeff Bonwick if (zio != pio) 1608e14bb325SJeff Bonwick zio_nowait(zio); 1609fa9e4066Sahrens } 1610fa9e4066Sahrens 1611e05725b1Sbonwick static int 1612e14bb325SJeff Bonwick zio_gang_assemble(zio_t *zio) 1613fa9e4066Sahrens { 1614e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1615fa9e4066Sahrens 1616f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); 1617f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1618f5383399SBill Moore 1619f5383399SBill Moore zio->io_gang_leader = zio; 1620fa9e4066Sahrens 1621e14bb325SJeff Bonwick zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); 1622e05725b1Sbonwick 1623e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1624fa9e4066Sahrens } 1625fa9e4066Sahrens 1626e05725b1Sbonwick static int 1627e14bb325SJeff Bonwick zio_gang_issue(zio_t *zio) 1628fa9e4066Sahrens { 1629e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1630fa9e4066Sahrens 1631e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) 1632e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1633fa9e4066Sahrens 1634f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); 1635f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1636fa9e4066Sahrens 1637e14bb325SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_GANG] == 0) 1638f5383399SBill Moore zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_data); 1639e14bb325SJeff Bonwick else 1640f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 1641fa9e4066Sahrens 1642e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1643e05725b1Sbonwick 1644e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1645fa9e4066Sahrens } 1646fa9e4066Sahrens 1647fa9e4066Sahrens static void 1648e14bb325SJeff Bonwick zio_write_gang_member_ready(zio_t *zio) 1649fa9e4066Sahrens { 1650a3f829aeSBill Moore zio_t *pio = zio_unique_parent(zio); 1651f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 165244cd46caSbillm dva_t *cdva = zio->io_bp->blk_dva; 165344cd46caSbillm dva_t *pdva = pio->io_bp->blk_dva; 1654fa9e4066Sahrens uint64_t asize; 1655fa9e4066Sahrens 1656e14bb325SJeff Bonwick if (BP_IS_HOLE(zio->io_bp)) 1657e14bb325SJeff Bonwick return; 1658e14bb325SJeff Bonwick 1659e14bb325SJeff Bonwick ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); 1660e14bb325SJeff Bonwick 1661e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_GANG); 1662b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); 1663b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); 1664b24ab676SJeff Bonwick ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); 166544cd46caSbillm ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); 1666fa9e4066Sahrens 1667fa9e4066Sahrens mutex_enter(&pio->io_lock); 1668e14bb325SJeff Bonwick for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { 166944cd46caSbillm ASSERT(DVA_GET_GANG(&pdva[d])); 167044cd46caSbillm asize = DVA_GET_ASIZE(&pdva[d]); 167144cd46caSbillm asize += DVA_GET_ASIZE(&cdva[d]); 167244cd46caSbillm DVA_SET_ASIZE(&pdva[d], asize); 167344cd46caSbillm } 1674fa9e4066Sahrens mutex_exit(&pio->io_lock); 1675fa9e4066Sahrens } 1676fa9e4066Sahrens 16770a4e9518Sgw static int 1678e14bb325SJeff Bonwick zio_write_gang_block(zio_t *pio) 1679fa9e4066Sahrens { 1680e14bb325SJeff Bonwick spa_t *spa = pio->io_spa; 1681e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 1682f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1683e14bb325SJeff Bonwick zio_t *zio; 1684e14bb325SJeff Bonwick zio_gang_node_t *gn, **gnpp; 1685fa9e4066Sahrens zio_gbh_phys_t *gbh; 1686e14bb325SJeff Bonwick uint64_t txg = pio->io_txg; 1687e14bb325SJeff Bonwick uint64_t resid = pio->io_size; 1688e14bb325SJeff Bonwick uint64_t lsize; 1689b24ab676SJeff Bonwick int copies = gio->io_prop.zp_copies; 1690b24ab676SJeff Bonwick int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); 1691e14bb325SJeff Bonwick zio_prop_t zp; 1692fa9e4066Sahrens int error; 1693fa9e4066Sahrens 1694b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), SPA_GANGBLOCKSIZE, 1695b24ab676SJeff Bonwick bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, 1696e14bb325SJeff Bonwick METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); 1697e05725b1Sbonwick if (error) { 1698e14bb325SJeff Bonwick pio->io_error = error; 1699e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1700e05725b1Sbonwick } 1701fa9e4066Sahrens 1702f5383399SBill Moore if (pio == gio) { 1703f5383399SBill Moore gnpp = &gio->io_gang_tree; 1704e14bb325SJeff Bonwick } else { 1705e14bb325SJeff Bonwick gnpp = pio->io_private; 1706e14bb325SJeff Bonwick ASSERT(pio->io_ready == zio_write_gang_member_ready); 1707fa9e4066Sahrens } 1708fa9e4066Sahrens 1709e14bb325SJeff Bonwick gn = zio_gang_node_alloc(gnpp); 1710e14bb325SJeff Bonwick gbh = gn->gn_gbh; 1711e14bb325SJeff Bonwick bzero(gbh, SPA_GANGBLOCKSIZE); 1712fa9e4066Sahrens 1713e14bb325SJeff Bonwick /* 1714e14bb325SJeff Bonwick * Create the gang header. 1715e14bb325SJeff Bonwick */ 1716e14bb325SJeff Bonwick zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, 1717e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1718fa9e4066Sahrens 1719e14bb325SJeff Bonwick /* 1720e14bb325SJeff Bonwick * Create and nowait the gang children. 1721e14bb325SJeff Bonwick */ 1722e14bb325SJeff Bonwick for (int g = 0; resid != 0; resid -= lsize, g++) { 1723e14bb325SJeff Bonwick lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), 1724e14bb325SJeff Bonwick SPA_MINBLOCKSIZE); 1725e14bb325SJeff Bonwick ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); 1726e14bb325SJeff Bonwick 1727f5383399SBill Moore zp.zp_checksum = gio->io_prop.zp_checksum; 1728e14bb325SJeff Bonwick zp.zp_compress = ZIO_COMPRESS_OFF; 1729e14bb325SJeff Bonwick zp.zp_type = DMU_OT_NONE; 1730e14bb325SJeff Bonwick zp.zp_level = 0; 1731b24ab676SJeff Bonwick zp.zp_copies = gio->io_prop.zp_copies; 1732b24ab676SJeff Bonwick zp.zp_dedup = 0; 1733b24ab676SJeff Bonwick zp.zp_dedup_verify = 0; 1734e14bb325SJeff Bonwick 1735e14bb325SJeff Bonwick zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], 1736e14bb325SJeff Bonwick (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, 1737e14bb325SJeff Bonwick zio_write_gang_member_ready, NULL, &gn->gn_child[g], 1738e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1739e14bb325SJeff Bonwick &pio->io_bookmark)); 1740e14bb325SJeff Bonwick } 1741e05725b1Sbonwick 174244cd46caSbillm /* 1743e14bb325SJeff Bonwick * Set pio's pipeline to just wait for zio to finish. 174444cd46caSbillm */ 1745e14bb325SJeff Bonwick pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1746e14bb325SJeff Bonwick 1747e14bb325SJeff Bonwick zio_nowait(zio); 1748e14bb325SJeff Bonwick 1749e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1750fa9e4066Sahrens } 1751fa9e4066Sahrens 1752fa9e4066Sahrens /* 1753fa9e4066Sahrens * ========================================================================== 1754b24ab676SJeff Bonwick * Dedup 1755fa9e4066Sahrens * ========================================================================== 1756fa9e4066Sahrens */ 1757b24ab676SJeff Bonwick static void 1758b24ab676SJeff Bonwick zio_ddt_child_read_done(zio_t *zio) 1759b24ab676SJeff Bonwick { 1760b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1761b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1762b24ab676SJeff Bonwick ddt_phys_t *ddp; 1763b24ab676SJeff Bonwick zio_t *pio = zio_unique_parent(zio); 1764b24ab676SJeff Bonwick 1765b24ab676SJeff Bonwick mutex_enter(&pio->io_lock); 1766b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 1767b24ab676SJeff Bonwick if (zio->io_error == 0) 1768b24ab676SJeff Bonwick ddt_phys_clear(ddp); /* this ddp doesn't need repair */ 1769b24ab676SJeff Bonwick if (zio->io_error == 0 && dde->dde_repair_data == NULL) 1770b24ab676SJeff Bonwick dde->dde_repair_data = zio->io_data; 1771b24ab676SJeff Bonwick else 1772b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zio->io_size); 1773b24ab676SJeff Bonwick mutex_exit(&pio->io_lock); 1774b24ab676SJeff Bonwick } 1775b24ab676SJeff Bonwick 1776b24ab676SJeff Bonwick static int 1777b24ab676SJeff Bonwick zio_ddt_read_start(zio_t *zio) 1778b24ab676SJeff Bonwick { 1779b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1780b24ab676SJeff Bonwick 1781b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1782b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1783b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1784b24ab676SJeff Bonwick 1785b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1786b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1787b24ab676SJeff Bonwick ddt_entry_t *dde = ddt_repair_start(ddt, bp); 1788b24ab676SJeff Bonwick ddt_phys_t *ddp = dde->dde_phys; 1789b24ab676SJeff Bonwick ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); 1790b24ab676SJeff Bonwick blkptr_t blk; 1791b24ab676SJeff Bonwick 1792b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1793b24ab676SJeff Bonwick zio->io_vsd = dde; 1794b24ab676SJeff Bonwick 1795b24ab676SJeff Bonwick if (ddp_self == NULL) 1796b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1797b24ab676SJeff Bonwick 1798b24ab676SJeff Bonwick for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { 1799b24ab676SJeff Bonwick if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) 1800b24ab676SJeff Bonwick continue; 1801bbfd46c4SJeff Bonwick ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, 1802bbfd46c4SJeff Bonwick &blk); 1803b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, &blk, 1804b24ab676SJeff Bonwick zio_buf_alloc(zio->io_size), zio->io_size, 1805b24ab676SJeff Bonwick zio_ddt_child_read_done, dde, zio->io_priority, 1806b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio) | ZIO_FLAG_DONT_PROPAGATE, 1807b24ab676SJeff Bonwick &zio->io_bookmark)); 1808b24ab676SJeff Bonwick } 1809b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1810b24ab676SJeff Bonwick } 1811b24ab676SJeff Bonwick 1812b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, bp, 1813b24ab676SJeff Bonwick zio->io_data, zio->io_size, NULL, NULL, zio->io_priority, 1814b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); 1815b24ab676SJeff Bonwick 1816b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1817b24ab676SJeff Bonwick } 1818e14bb325SJeff Bonwick 1819b24ab676SJeff Bonwick static int 1820b24ab676SJeff Bonwick zio_ddt_read_done(zio_t *zio) 1821b24ab676SJeff Bonwick { 1822b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1823b24ab676SJeff Bonwick 1824b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE)) 1825b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 1826b24ab676SJeff Bonwick 1827b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1828b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1829b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1830b24ab676SJeff Bonwick 1831b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1832b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1833b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_vsd; 1834b24ab676SJeff Bonwick if (ddt == NULL) { 1835b16da2e2SGeorge Wilson ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE); 1836b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1837b24ab676SJeff Bonwick } 1838b24ab676SJeff Bonwick if (dde == NULL) { 1839b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; 184035a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 1841b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 1842b24ab676SJeff Bonwick } 1843b24ab676SJeff Bonwick if (dde->dde_repair_data != NULL) { 1844b24ab676SJeff Bonwick bcopy(dde->dde_repair_data, zio->io_data, zio->io_size); 1845b24ab676SJeff Bonwick zio->io_child_error[ZIO_CHILD_DDT] = 0; 1846b24ab676SJeff Bonwick } 1847b24ab676SJeff Bonwick ddt_repair_done(ddt, dde); 1848b24ab676SJeff Bonwick zio->io_vsd = NULL; 1849b24ab676SJeff Bonwick } 1850b24ab676SJeff Bonwick 1851b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1852b24ab676SJeff Bonwick 1853b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1854b24ab676SJeff Bonwick } 1855b24ab676SJeff Bonwick 1856b24ab676SJeff Bonwick static boolean_t 1857b24ab676SJeff Bonwick zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) 1858b24ab676SJeff Bonwick { 1859b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 1860b24ab676SJeff Bonwick 1861b24ab676SJeff Bonwick /* 1862b24ab676SJeff Bonwick * Note: we compare the original data, not the transformed data, 1863b24ab676SJeff Bonwick * because when zio->io_bp is an override bp, we will not have 1864b24ab676SJeff Bonwick * pushed the I/O transforms. That's an important optimization 1865b24ab676SJeff Bonwick * because otherwise we'd compress/encrypt all dmu_sync() data twice. 1866b24ab676SJeff Bonwick */ 1867b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 1868b24ab676SJeff Bonwick zio_t *lio = dde->dde_lead_zio[p]; 1869b24ab676SJeff Bonwick 1870b24ab676SJeff Bonwick if (lio != NULL) { 1871b24ab676SJeff Bonwick return (lio->io_orig_size != zio->io_orig_size || 1872b24ab676SJeff Bonwick bcmp(zio->io_orig_data, lio->io_orig_data, 1873b24ab676SJeff Bonwick zio->io_orig_size) != 0); 1874b24ab676SJeff Bonwick } 1875b24ab676SJeff Bonwick } 1876b24ab676SJeff Bonwick 1877b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 1878b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1879b24ab676SJeff Bonwick 1880b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) { 1881b24ab676SJeff Bonwick arc_buf_t *abuf = NULL; 1882b24ab676SJeff Bonwick uint32_t aflags = ARC_WAIT; 1883b24ab676SJeff Bonwick blkptr_t blk = *zio->io_bp; 1884b24ab676SJeff Bonwick int error; 1885b24ab676SJeff Bonwick 1886b24ab676SJeff Bonwick ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); 1887b24ab676SJeff Bonwick 1888b24ab676SJeff Bonwick ddt_exit(ddt); 1889b24ab676SJeff Bonwick 1890b24ab676SJeff Bonwick error = arc_read_nolock(NULL, spa, &blk, 1891b24ab676SJeff Bonwick arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, 1892b24ab676SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 1893b24ab676SJeff Bonwick &aflags, &zio->io_bookmark); 1894b24ab676SJeff Bonwick 1895b24ab676SJeff Bonwick if (error == 0) { 1896b24ab676SJeff Bonwick if (arc_buf_size(abuf) != zio->io_orig_size || 1897b24ab676SJeff Bonwick bcmp(abuf->b_data, zio->io_orig_data, 1898b24ab676SJeff Bonwick zio->io_orig_size) != 0) 1899b24ab676SJeff Bonwick error = EEXIST; 1900b24ab676SJeff Bonwick VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 1901b24ab676SJeff Bonwick } 1902b24ab676SJeff Bonwick 1903b24ab676SJeff Bonwick ddt_enter(ddt); 1904b24ab676SJeff Bonwick return (error != 0); 1905b24ab676SJeff Bonwick } 1906b24ab676SJeff Bonwick } 1907b24ab676SJeff Bonwick 1908b24ab676SJeff Bonwick return (B_FALSE); 1909b24ab676SJeff Bonwick } 1910b24ab676SJeff Bonwick 1911b24ab676SJeff Bonwick static void 1912b24ab676SJeff Bonwick zio_ddt_child_write_ready(zio_t *zio) 1913b24ab676SJeff Bonwick { 1914b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 1915b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 1916b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1917b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1918b24ab676SJeff Bonwick zio_t *pio; 1919b24ab676SJeff Bonwick 1920b24ab676SJeff Bonwick if (zio->io_error) 1921b24ab676SJeff Bonwick return; 1922b24ab676SJeff Bonwick 1923b24ab676SJeff Bonwick ddt_enter(ddt); 1924b24ab676SJeff Bonwick 1925b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1926b24ab676SJeff Bonwick 1927b24ab676SJeff Bonwick ddt_phys_fill(ddp, zio->io_bp); 1928b24ab676SJeff Bonwick 1929b24ab676SJeff Bonwick while ((pio = zio_walk_parents(zio)) != NULL) 1930b24ab676SJeff Bonwick ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); 1931b24ab676SJeff Bonwick 1932b24ab676SJeff Bonwick ddt_exit(ddt); 1933b24ab676SJeff Bonwick } 1934b24ab676SJeff Bonwick 1935b24ab676SJeff Bonwick static void 1936b24ab676SJeff Bonwick zio_ddt_child_write_done(zio_t *zio) 1937b24ab676SJeff Bonwick { 1938b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 1939b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 1940b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1941b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1942b24ab676SJeff Bonwick 1943b24ab676SJeff Bonwick ddt_enter(ddt); 1944b24ab676SJeff Bonwick 1945b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 1946b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1947b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 1948b24ab676SJeff Bonwick 1949b24ab676SJeff Bonwick if (zio->io_error == 0) { 1950b24ab676SJeff Bonwick while (zio_walk_parents(zio) != NULL) 1951b24ab676SJeff Bonwick ddt_phys_addref(ddp); 1952b24ab676SJeff Bonwick } else { 1953b24ab676SJeff Bonwick ddt_phys_clear(ddp); 1954b24ab676SJeff Bonwick } 1955b24ab676SJeff Bonwick 1956b24ab676SJeff Bonwick ddt_exit(ddt); 1957b24ab676SJeff Bonwick } 1958b24ab676SJeff Bonwick 1959b24ab676SJeff Bonwick static void 1960b24ab676SJeff Bonwick zio_ddt_ditto_write_done(zio_t *zio) 1961b24ab676SJeff Bonwick { 1962b24ab676SJeff Bonwick int p = DDT_PHYS_DITTO; 1963b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 1964b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1965b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1966b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1967b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1968b24ab676SJeff Bonwick ddt_key_t *ddk = &dde->dde_key; 1969b24ab676SJeff Bonwick 1970b24ab676SJeff Bonwick ddt_enter(ddt); 1971b24ab676SJeff Bonwick 1972b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 1973b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1974b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 1975b24ab676SJeff Bonwick 1976b24ab676SJeff Bonwick if (zio->io_error == 0) { 1977b24ab676SJeff Bonwick ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); 1978b24ab676SJeff Bonwick ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); 1979b24ab676SJeff Bonwick ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); 1980b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 1981b24ab676SJeff Bonwick ddt_phys_free(ddt, ddk, ddp, zio->io_txg); 1982b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 1983b24ab676SJeff Bonwick } 1984b24ab676SJeff Bonwick 1985b24ab676SJeff Bonwick ddt_exit(ddt); 1986b24ab676SJeff Bonwick } 1987b24ab676SJeff Bonwick 1988b24ab676SJeff Bonwick static int 1989b24ab676SJeff Bonwick zio_ddt_write(zio_t *zio) 1990b24ab676SJeff Bonwick { 1991b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 1992b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1993b24ab676SJeff Bonwick uint64_t txg = zio->io_txg; 1994b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 1995b24ab676SJeff Bonwick int p = zp->zp_copies; 1996b24ab676SJeff Bonwick int ditto_copies; 1997b24ab676SJeff Bonwick zio_t *cio = NULL; 1998b24ab676SJeff Bonwick zio_t *dio = NULL; 1999b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2000b24ab676SJeff Bonwick ddt_entry_t *dde; 2001b24ab676SJeff Bonwick ddt_phys_t *ddp; 2002b24ab676SJeff Bonwick 2003b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2004b24ab676SJeff Bonwick ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); 2005b24ab676SJeff Bonwick ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); 2006b24ab676SJeff Bonwick 2007b24ab676SJeff Bonwick ddt_enter(ddt); 2008b24ab676SJeff Bonwick dde = ddt_lookup(ddt, bp, B_TRUE); 2009b24ab676SJeff Bonwick ddp = &dde->dde_phys[p]; 2010b24ab676SJeff Bonwick 2011b24ab676SJeff Bonwick if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { 2012b24ab676SJeff Bonwick /* 2013b24ab676SJeff Bonwick * If we're using a weak checksum, upgrade to a strong checksum 2014b24ab676SJeff Bonwick * and try again. If we're already using a strong checksum, 2015b24ab676SJeff Bonwick * we can't resolve it, so just convert to an ordinary write. 2016b24ab676SJeff Bonwick * (And automatically e-mail a paper to Nature?) 2017b24ab676SJeff Bonwick */ 2018b24ab676SJeff Bonwick if (!zio_checksum_table[zp->zp_checksum].ci_dedup) { 2019b24ab676SJeff Bonwick zp->zp_checksum = spa_dedup_checksum(spa); 2020b24ab676SJeff Bonwick zio_pop_transforms(zio); 2021b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2022b24ab676SJeff Bonwick BP_ZERO(bp); 2023b24ab676SJeff Bonwick } else { 2024b24ab676SJeff Bonwick zp->zp_dedup = 0; 2025b24ab676SJeff Bonwick } 2026b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2027b24ab676SJeff Bonwick ddt_exit(ddt); 2028b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2029b24ab676SJeff Bonwick } 2030b24ab676SJeff Bonwick 2031b24ab676SJeff Bonwick ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); 2032b24ab676SJeff Bonwick ASSERT(ditto_copies < SPA_DVAS_PER_BP); 2033b24ab676SJeff Bonwick 2034b24ab676SJeff Bonwick if (ditto_copies > ddt_ditto_copies_present(dde) && 2035b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { 2036b24ab676SJeff Bonwick zio_prop_t czp = *zp; 2037b24ab676SJeff Bonwick 2038b24ab676SJeff Bonwick czp.zp_copies = ditto_copies; 2039b24ab676SJeff Bonwick 2040b24ab676SJeff Bonwick /* 2041b24ab676SJeff Bonwick * If we arrived here with an override bp, we won't have run 2042b24ab676SJeff Bonwick * the transform stack, so we won't have the data we need to 2043b24ab676SJeff Bonwick * generate a child i/o. So, toss the override bp and restart. 2044b24ab676SJeff Bonwick * This is safe, because using the override bp is just an 2045b24ab676SJeff Bonwick * optimization; and it's rare, so the cost doesn't matter. 2046b24ab676SJeff Bonwick */ 2047b24ab676SJeff Bonwick if (zio->io_bp_override) { 2048b24ab676SJeff Bonwick zio_pop_transforms(zio); 2049b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2050b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2051b24ab676SJeff Bonwick zio->io_bp_override = NULL; 2052b24ab676SJeff Bonwick BP_ZERO(bp); 2053b24ab676SJeff Bonwick ddt_exit(ddt); 2054b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2055b24ab676SJeff Bonwick } 2056b24ab676SJeff Bonwick 2057b24ab676SJeff Bonwick dio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 2058b24ab676SJeff Bonwick zio->io_orig_size, &czp, NULL, 2059b24ab676SJeff Bonwick zio_ddt_ditto_write_done, dde, zio->io_priority, 2060b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2061b24ab676SJeff Bonwick 2062b24ab676SJeff Bonwick zio_push_transform(dio, zio->io_data, zio->io_size, 0, NULL); 2063b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; 2064b24ab676SJeff Bonwick } 2065b24ab676SJeff Bonwick 2066b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { 2067b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2068b24ab676SJeff Bonwick ddt_bp_fill(ddp, bp, txg); 2069b24ab676SJeff Bonwick if (dde->dde_lead_zio[p] != NULL) 2070b24ab676SJeff Bonwick zio_add_child(zio, dde->dde_lead_zio[p]); 2071b24ab676SJeff Bonwick else 2072b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2073b24ab676SJeff Bonwick } else if (zio->io_bp_override) { 2074b24ab676SJeff Bonwick ASSERT(bp->blk_birth == txg); 2075b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, zio->io_bp_override)); 2076b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2077b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2078b24ab676SJeff Bonwick } else { 2079b24ab676SJeff Bonwick cio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 2080b24ab676SJeff Bonwick zio->io_orig_size, zp, zio_ddt_child_write_ready, 2081b24ab676SJeff Bonwick zio_ddt_child_write_done, dde, zio->io_priority, 2082b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2083b24ab676SJeff Bonwick 2084b24ab676SJeff Bonwick zio_push_transform(cio, zio->io_data, zio->io_size, 0, NULL); 2085b24ab676SJeff Bonwick dde->dde_lead_zio[p] = cio; 2086b24ab676SJeff Bonwick } 2087b24ab676SJeff Bonwick 2088b24ab676SJeff Bonwick ddt_exit(ddt); 2089b24ab676SJeff Bonwick 2090b24ab676SJeff Bonwick if (cio) 2091b24ab676SJeff Bonwick zio_nowait(cio); 2092b24ab676SJeff Bonwick if (dio) 2093b24ab676SJeff Bonwick zio_nowait(dio); 2094b24ab676SJeff Bonwick 2095b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2096b24ab676SJeff Bonwick } 2097b24ab676SJeff Bonwick 20983f9d6ad7SLin Ling ddt_entry_t *freedde; /* for debugging */ 20993f9d6ad7SLin Ling 2100b24ab676SJeff Bonwick static int 2101b24ab676SJeff Bonwick zio_ddt_free(zio_t *zio) 2102b24ab676SJeff Bonwick { 2103b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2104b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2105b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2106b24ab676SJeff Bonwick ddt_entry_t *dde; 2107b24ab676SJeff Bonwick ddt_phys_t *ddp; 2108b24ab676SJeff Bonwick 2109b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2110b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2111b24ab676SJeff Bonwick 2112b24ab676SJeff Bonwick ddt_enter(ddt); 21133f9d6ad7SLin Ling freedde = dde = ddt_lookup(ddt, bp, B_TRUE); 2114b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 2115b24ab676SJeff Bonwick ddt_phys_decref(ddp); 2116b24ab676SJeff Bonwick ddt_exit(ddt); 2117b24ab676SJeff Bonwick 2118b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2119b24ab676SJeff Bonwick } 2120b24ab676SJeff Bonwick 2121b24ab676SJeff Bonwick /* 2122b24ab676SJeff Bonwick * ========================================================================== 2123b24ab676SJeff Bonwick * Allocate and free blocks 2124b24ab676SJeff Bonwick * ========================================================================== 2125b24ab676SJeff Bonwick */ 2126e05725b1Sbonwick static int 2127fa9e4066Sahrens zio_dva_allocate(zio_t *zio) 2128fa9e4066Sahrens { 21298654d025Sperrin spa_t *spa = zio->io_spa; 2130b24ab676SJeff Bonwick metaslab_class_t *mc = spa_normal_class(spa); 2131fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2132fa9e4066Sahrens int error; 213309c9d376SGeorge Wilson int flags = 0; 2134fa9e4066Sahrens 2135f5383399SBill Moore if (zio->io_gang_leader == NULL) { 2136f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 2137f5383399SBill Moore zio->io_gang_leader = zio; 2138f5383399SBill Moore } 2139f5383399SBill Moore 2140fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 214144cd46caSbillm ASSERT3U(BP_GET_NDVAS(bp), ==, 0); 2142b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, >, 0); 2143b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); 2144fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 2145fa9e4066Sahrens 214609c9d376SGeorge Wilson /* 214709c9d376SGeorge Wilson * The dump device does not support gang blocks so allocation on 214809c9d376SGeorge Wilson * behalf of the dump device (i.e. ZIO_FLAG_NODATA) must avoid 214909c9d376SGeorge Wilson * the "fast" gang feature. 215009c9d376SGeorge Wilson */ 215109c9d376SGeorge Wilson flags |= (zio->io_flags & ZIO_FLAG_NODATA) ? METASLAB_GANG_AVOID : 0; 215209c9d376SGeorge Wilson flags |= (zio->io_flags & ZIO_FLAG_GANG_CHILD) ? 215309c9d376SGeorge Wilson METASLAB_GANG_CHILD : 0; 2154e14bb325SJeff Bonwick error = metaslab_alloc(spa, mc, zio->io_size, bp, 215509c9d376SGeorge Wilson zio->io_prop.zp_copies, zio->io_txg, NULL, flags); 2156fa9e4066Sahrens 2157e14bb325SJeff Bonwick if (error) { 215809c9d376SGeorge Wilson spa_dbgmsg(spa, "%s: metaslab allocation failure: zio %p, " 215909c9d376SGeorge Wilson "size %llu, error %d", spa_name(spa), zio, zio->io_size, 216009c9d376SGeorge Wilson error); 2161e14bb325SJeff Bonwick if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) 2162e14bb325SJeff Bonwick return (zio_write_gang_block(zio)); 2163fa9e4066Sahrens zio->io_error = error; 2164fa9e4066Sahrens } 2165e05725b1Sbonwick 2166e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2167fa9e4066Sahrens } 2168fa9e4066Sahrens 2169e05725b1Sbonwick static int 2170fa9e4066Sahrens zio_dva_free(zio_t *zio) 2171fa9e4066Sahrens { 2172e14bb325SJeff Bonwick metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); 2173fa9e4066Sahrens 2174e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2175fa9e4066Sahrens } 2176fa9e4066Sahrens 2177e05725b1Sbonwick static int 2178fa9e4066Sahrens zio_dva_claim(zio_t *zio) 2179fa9e4066Sahrens { 2180e14bb325SJeff Bonwick int error; 2181e14bb325SJeff Bonwick 2182e14bb325SJeff Bonwick error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); 2183e14bb325SJeff Bonwick if (error) 2184e14bb325SJeff Bonwick zio->io_error = error; 2185fa9e4066Sahrens 2186e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2187fa9e4066Sahrens } 2188fa9e4066Sahrens 2189e14bb325SJeff Bonwick /* 2190e14bb325SJeff Bonwick * Undo an allocation. This is used by zio_done() when an I/O fails 2191e14bb325SJeff Bonwick * and we want to give back the block we just allocated. 2192e14bb325SJeff Bonwick * This handles both normal blocks and gang blocks. 2193e14bb325SJeff Bonwick */ 2194e14bb325SJeff Bonwick static void 2195e14bb325SJeff Bonwick zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) 2196e14bb325SJeff Bonwick { 2197e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2198b24ab676SJeff Bonwick ASSERT(zio->io_bp_override == NULL); 2199e14bb325SJeff Bonwick 2200e14bb325SJeff Bonwick if (!BP_IS_HOLE(bp)) 2201b24ab676SJeff Bonwick metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); 2202e14bb325SJeff Bonwick 2203e14bb325SJeff Bonwick if (gn != NULL) { 2204e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 2205e14bb325SJeff Bonwick zio_dva_unallocate(zio, gn->gn_child[g], 2206e14bb325SJeff Bonwick &gn->gn_gbh->zg_blkptr[g]); 2207e14bb325SJeff Bonwick } 2208e14bb325SJeff Bonwick } 2209e14bb325SJeff Bonwick } 2210e14bb325SJeff Bonwick 2211e14bb325SJeff Bonwick /* 2212e14bb325SJeff Bonwick * Try to allocate an intent log block. Return 0 on success, errno on failure. 2213e14bb325SJeff Bonwick */ 2214e14bb325SJeff Bonwick int 2215b24ab676SJeff Bonwick zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, blkptr_t *old_bp, 2216b24ab676SJeff Bonwick uint64_t size, boolean_t use_slog) 2217e14bb325SJeff Bonwick { 2218e09fa4daSNeil Perrin int error = 1; 2219e14bb325SJeff Bonwick 2220b24ab676SJeff Bonwick ASSERT(txg > spa_syncing_txg(spa)); 2221b24ab676SJeff Bonwick 2222d48e086fSNeil Perrin if (use_slog) 2223b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_log_class(spa), size, 2224e09fa4daSNeil Perrin new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); 2225e14bb325SJeff Bonwick 2226e14bb325SJeff Bonwick if (error) 2227b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), size, 2228e14bb325SJeff Bonwick new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); 2229e14bb325SJeff Bonwick 2230e14bb325SJeff Bonwick if (error == 0) { 2231e14bb325SJeff Bonwick BP_SET_LSIZE(new_bp, size); 2232e14bb325SJeff Bonwick BP_SET_PSIZE(new_bp, size); 2233e14bb325SJeff Bonwick BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); 22346e1f5caaSNeil Perrin BP_SET_CHECKSUM(new_bp, 22356e1f5caaSNeil Perrin spa_version(spa) >= SPA_VERSION_SLIM_ZIL 22366e1f5caaSNeil Perrin ? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG); 2237e14bb325SJeff Bonwick BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 2238e14bb325SJeff Bonwick BP_SET_LEVEL(new_bp, 0); 2239b24ab676SJeff Bonwick BP_SET_DEDUP(new_bp, 0); 2240e14bb325SJeff Bonwick BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); 2241e14bb325SJeff Bonwick } 2242e14bb325SJeff Bonwick 2243e14bb325SJeff Bonwick return (error); 2244e14bb325SJeff Bonwick } 2245e14bb325SJeff Bonwick 2246e14bb325SJeff Bonwick /* 2247b24ab676SJeff Bonwick * Free an intent log block. 2248e14bb325SJeff Bonwick */ 2249e14bb325SJeff Bonwick void 2250b24ab676SJeff Bonwick zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp) 2251e14bb325SJeff Bonwick { 2252b24ab676SJeff Bonwick ASSERT(BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG); 2253e14bb325SJeff Bonwick ASSERT(!BP_IS_GANG(bp)); 2254e14bb325SJeff Bonwick 2255b24ab676SJeff Bonwick zio_free(spa, txg, bp); 2256e14bb325SJeff Bonwick } 2257e14bb325SJeff Bonwick 2258fa9e4066Sahrens /* 2259fa9e4066Sahrens * ========================================================================== 2260fa9e4066Sahrens * Read and write to physical devices 2261fa9e4066Sahrens * ========================================================================== 2262fa9e4066Sahrens */ 2263e05725b1Sbonwick static int 226444cd46caSbillm zio_vdev_io_start(zio_t *zio) 2265fa9e4066Sahrens { 2266fa9e4066Sahrens vdev_t *vd = zio->io_vd; 226744cd46caSbillm uint64_t align; 22680a4e9518Sgw spa_t *spa = zio->io_spa; 22690a4e9518Sgw 2270e14bb325SJeff Bonwick ASSERT(zio->io_error == 0); 2271e14bb325SJeff Bonwick ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); 2272fa9e4066Sahrens 2273e14bb325SJeff Bonwick if (vd == NULL) { 2274e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2275e14bb325SJeff Bonwick spa_config_enter(spa, SCL_ZIO, zio, RW_READER); 2276fa9e4066Sahrens 2277e14bb325SJeff Bonwick /* 2278e14bb325SJeff Bonwick * The mirror_ops handle multiple DVAs in a single BP. 2279e14bb325SJeff Bonwick */ 2280e14bb325SJeff Bonwick return (vdev_mirror_ops.vdev_op_io_start(zio)); 2281fa9e4066Sahrens } 2282fa9e4066Sahrens 228344ecc532SGeorge Wilson /* 228444ecc532SGeorge Wilson * We keep track of time-sensitive I/Os so that the scan thread 228544ecc532SGeorge Wilson * can quickly react to certain workloads. In particular, we care 228644ecc532SGeorge Wilson * about non-scrubbing, top-level reads and writes with the following 228744ecc532SGeorge Wilson * characteristics: 228844ecc532SGeorge Wilson * - synchronous writes of user data to non-slog devices 228944ecc532SGeorge Wilson * - any reads of user data 229044ecc532SGeorge Wilson * When these conditions are met, adjust the timestamp of spa_last_io 229144ecc532SGeorge Wilson * which allows the scan thread to adjust its workload accordingly. 229244ecc532SGeorge Wilson */ 229344ecc532SGeorge Wilson if (!(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && zio->io_bp != NULL && 229444ecc532SGeorge Wilson vd == vd->vdev_top && !vd->vdev_islog && 229544ecc532SGeorge Wilson zio->io_bookmark.zb_objset != DMU_META_OBJSET && 229644ecc532SGeorge Wilson zio->io_txg != spa_syncing_txg(spa)) { 229744ecc532SGeorge Wilson uint64_t old = spa->spa_last_io; 229844ecc532SGeorge Wilson uint64_t new = ddi_get_lbolt64(); 229944ecc532SGeorge Wilson if (old != new) 230044ecc532SGeorge Wilson (void) atomic_cas_64(&spa->spa_last_io, old, new); 230144ecc532SGeorge Wilson } 230244ecc532SGeorge Wilson 2303e14bb325SJeff Bonwick align = 1ULL << vd->vdev_top->vdev_ashift; 2304e14bb325SJeff Bonwick 2305ecc2d604Sbonwick if (P2PHASE(zio->io_size, align) != 0) { 2306ecc2d604Sbonwick uint64_t asize = P2ROUNDUP(zio->io_size, align); 2307ecc2d604Sbonwick char *abuf = zio_buf_alloc(asize); 2308e14bb325SJeff Bonwick ASSERT(vd == vd->vdev_top); 2309ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_WRITE) { 2310ecc2d604Sbonwick bcopy(zio->io_data, abuf, zio->io_size); 2311ecc2d604Sbonwick bzero(abuf + zio->io_size, asize - zio->io_size); 2312ecc2d604Sbonwick } 2313e14bb325SJeff Bonwick zio_push_transform(zio, abuf, asize, asize, zio_subblock); 2314ecc2d604Sbonwick } 2315ecc2d604Sbonwick 2316ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_offset, align) == 0); 2317ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_size, align) == 0); 2318f9af39baSGeorge Wilson VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); 23198ad4d6ddSJeff Bonwick 23208ad4d6ddSJeff Bonwick /* 23218ad4d6ddSJeff Bonwick * If this is a repair I/O, and there's no self-healing involved -- 23228ad4d6ddSJeff Bonwick * that is, we're just resilvering what we expect to resilver -- 23238ad4d6ddSJeff Bonwick * then don't do the I/O unless zio's txg is actually in vd's DTL. 23248ad4d6ddSJeff Bonwick * This prevents spurious resilvering with nested replication. 23258ad4d6ddSJeff Bonwick * For example, given a mirror of mirrors, (A+B)+(C+D), if only 23268ad4d6ddSJeff Bonwick * A is out of date, we'll read from C+D, then use the data to 23278ad4d6ddSJeff Bonwick * resilver A+B -- but we don't actually want to resilver B, just A. 23288ad4d6ddSJeff Bonwick * The top-level mirror has no way to know this, so instead we just 23298ad4d6ddSJeff Bonwick * discard unnecessary repairs as we work our way down the vdev tree. 23308ad4d6ddSJeff Bonwick * The same logic applies to any form of nested replication: 23318ad4d6ddSJeff Bonwick * ditto + mirror, RAID-Z + replacing, etc. This covers them all. 23328ad4d6ddSJeff Bonwick */ 23338ad4d6ddSJeff Bonwick if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && 23348ad4d6ddSJeff Bonwick !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && 23358ad4d6ddSJeff Bonwick zio->io_txg != 0 && /* not a delegated i/o */ 23368ad4d6ddSJeff Bonwick !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { 23378ad4d6ddSJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 23388ad4d6ddSJeff Bonwick zio_vdev_io_bypass(zio); 23398ad4d6ddSJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 23408ad4d6ddSJeff Bonwick } 2341fa9e4066Sahrens 2342e14bb325SJeff Bonwick if (vd->vdev_ops->vdev_op_leaf && 2343e14bb325SJeff Bonwick (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { 2344e14bb325SJeff Bonwick 2345e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) 2346a3f829aeSBill Moore return (ZIO_PIPELINE_CONTINUE); 2347e14bb325SJeff Bonwick 2348e14bb325SJeff Bonwick if ((zio = vdev_queue_io(zio)) == NULL) 2349e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2350e14bb325SJeff Bonwick 2351e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2352e14bb325SJeff Bonwick zio->io_error = ENXIO; 2353e14bb325SJeff Bonwick zio_interrupt(zio); 2354e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2355e14bb325SJeff Bonwick } 2356e14bb325SJeff Bonwick } 2357e14bb325SJeff Bonwick 2358e05725b1Sbonwick return (vd->vdev_ops->vdev_op_io_start(zio)); 2359fa9e4066Sahrens } 2360fa9e4066Sahrens 2361e05725b1Sbonwick static int 2362fa9e4066Sahrens zio_vdev_io_done(zio_t *zio) 2363fa9e4066Sahrens { 2364e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2365e14bb325SJeff Bonwick vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; 2366e14bb325SJeff Bonwick boolean_t unexpected_error = B_FALSE; 2367e05725b1Sbonwick 2368e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2369e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2370fa9e4066Sahrens 2371e14bb325SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); 2372e14bb325SJeff Bonwick 2373e14bb325SJeff Bonwick if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { 2374e14bb325SJeff Bonwick 2375e14bb325SJeff Bonwick vdev_queue_io_done(zio); 2376fa9e4066Sahrens 2377e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE) 2378e14bb325SJeff Bonwick vdev_cache_write(zio); 2379e14bb325SJeff Bonwick 2380e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 23818956713aSEric Schrock zio->io_error = zio_handle_device_injection(vd, 23828956713aSEric Schrock zio, EIO); 2383e14bb325SJeff Bonwick 2384e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2385e14bb325SJeff Bonwick zio->io_error = zio_handle_label_injection(zio, EIO); 2386e14bb325SJeff Bonwick 2387e14bb325SJeff Bonwick if (zio->io_error) { 2388e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2389e14bb325SJeff Bonwick zio->io_error = ENXIO; 2390e14bb325SJeff Bonwick } else { 2391e14bb325SJeff Bonwick unexpected_error = B_TRUE; 2392e14bb325SJeff Bonwick } 2393e14bb325SJeff Bonwick } 239451ece835Seschrock } 2395fa9e4066Sahrens 2396e14bb325SJeff Bonwick ops->vdev_op_io_done(zio); 2397e14bb325SJeff Bonwick 2398e14bb325SJeff Bonwick if (unexpected_error) 2399a3f829aeSBill Moore VERIFY(vdev_probe(vd, zio) == NULL); 2400e14bb325SJeff Bonwick 2401e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2402fa9e4066Sahrens } 2403fa9e4066Sahrens 240422fe2c88SJonathan Adams /* 240522fe2c88SJonathan Adams * For non-raidz ZIOs, we can just copy aside the bad data read from the 240622fe2c88SJonathan Adams * disk, and use that to finish the checksum ereport later. 240722fe2c88SJonathan Adams */ 240822fe2c88SJonathan Adams static void 240922fe2c88SJonathan Adams zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, 241022fe2c88SJonathan Adams const void *good_buf) 241122fe2c88SJonathan Adams { 241222fe2c88SJonathan Adams /* no processing needed */ 241322fe2c88SJonathan Adams zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); 241422fe2c88SJonathan Adams } 241522fe2c88SJonathan Adams 241622fe2c88SJonathan Adams /*ARGSUSED*/ 241722fe2c88SJonathan Adams void 241822fe2c88SJonathan Adams zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) 241922fe2c88SJonathan Adams { 242022fe2c88SJonathan Adams void *buf = zio_buf_alloc(zio->io_size); 242122fe2c88SJonathan Adams 242222fe2c88SJonathan Adams bcopy(zio->io_data, buf, zio->io_size); 242322fe2c88SJonathan Adams 242422fe2c88SJonathan Adams zcr->zcr_cbinfo = zio->io_size; 242522fe2c88SJonathan Adams zcr->zcr_cbdata = buf; 242622fe2c88SJonathan Adams zcr->zcr_finish = zio_vsd_default_cksum_finish; 242722fe2c88SJonathan Adams zcr->zcr_free = zio_buf_free; 242822fe2c88SJonathan Adams } 242922fe2c88SJonathan Adams 2430e05725b1Sbonwick static int 2431fa9e4066Sahrens zio_vdev_io_assess(zio_t *zio) 2432fa9e4066Sahrens { 2433fa9e4066Sahrens vdev_t *vd = zio->io_vd; 2434e14bb325SJeff Bonwick 2435e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2436e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2437e14bb325SJeff Bonwick 2438e14bb325SJeff Bonwick if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2439e14bb325SJeff Bonwick spa_config_exit(zio->io_spa, SCL_ZIO, zio); 2440e14bb325SJeff Bonwick 2441e14bb325SJeff Bonwick if (zio->io_vsd != NULL) { 244222fe2c88SJonathan Adams zio->io_vsd_ops->vsd_free(zio); 2443e14bb325SJeff Bonwick zio->io_vsd = NULL; 2444ecc2d604Sbonwick } 2445ecc2d604Sbonwick 2446e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2447ea8dc4b6Seschrock zio->io_error = zio_handle_fault_injection(zio, EIO); 2448ea8dc4b6Seschrock 2449fa9e4066Sahrens /* 2450fa9e4066Sahrens * If the I/O failed, determine whether we should attempt to retry it. 245135a5a358SJonathan Adams * 245235a5a358SJonathan Adams * On retry, we cut in line in the issue queue, since we don't want 245335a5a358SJonathan Adams * compression/checksumming/etc. work to prevent our (cheap) IO reissue. 2454fa9e4066Sahrens */ 2455e14bb325SJeff Bonwick if (zio->io_error && vd == NULL && 2456e14bb325SJeff Bonwick !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { 2457e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ 2458e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ 2459fa9e4066Sahrens zio->io_error = 0; 2460e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_RETRY | 2461e14bb325SJeff Bonwick ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; 2462b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; 246335a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, 246435a5a358SJonathan Adams zio_requeue_io_start_cut_in_line); 2465e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2466ea8dc4b6Seschrock } 2467fa9e4066Sahrens 2468e14bb325SJeff Bonwick /* 2469e14bb325SJeff Bonwick * If we got an error on a leaf device, convert it to ENXIO 2470e14bb325SJeff Bonwick * if the device is not accessible at all. 2471e14bb325SJeff Bonwick */ 2472e14bb325SJeff Bonwick if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && 2473e14bb325SJeff Bonwick !vdev_accessible(vd, zio)) 2474e14bb325SJeff Bonwick zio->io_error = ENXIO; 2475e14bb325SJeff Bonwick 2476e14bb325SJeff Bonwick /* 2477e14bb325SJeff Bonwick * If we can't write to an interior vdev (mirror or RAID-Z), 2478e14bb325SJeff Bonwick * set vdev_cant_write so that we stop trying to allocate from it. 2479e14bb325SJeff Bonwick */ 2480e14bb325SJeff Bonwick if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && 2481e14bb325SJeff Bonwick vd != NULL && !vd->vdev_ops->vdev_op_leaf) 2482e14bb325SJeff Bonwick vd->vdev_cant_write = B_TRUE; 2483e14bb325SJeff Bonwick 2484e14bb325SJeff Bonwick if (zio->io_error) 2485e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2486e14bb325SJeff Bonwick 2487e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2488fa9e4066Sahrens } 2489fa9e4066Sahrens 2490fa9e4066Sahrens void 2491fa9e4066Sahrens zio_vdev_io_reissue(zio_t *zio) 2492fa9e4066Sahrens { 2493fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2494fa9e4066Sahrens ASSERT(zio->io_error == 0); 2495fa9e4066Sahrens 2496b24ab676SJeff Bonwick zio->io_stage >>= 1; 2497fa9e4066Sahrens } 2498fa9e4066Sahrens 2499fa9e4066Sahrens void 2500fa9e4066Sahrens zio_vdev_io_redone(zio_t *zio) 2501fa9e4066Sahrens { 2502fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); 2503fa9e4066Sahrens 2504b24ab676SJeff Bonwick zio->io_stage >>= 1; 2505fa9e4066Sahrens } 2506fa9e4066Sahrens 2507fa9e4066Sahrens void 2508fa9e4066Sahrens zio_vdev_io_bypass(zio_t *zio) 2509fa9e4066Sahrens { 2510fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2511fa9e4066Sahrens ASSERT(zio->io_error == 0); 2512fa9e4066Sahrens 2513fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_IO_BYPASS; 2514b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; 2515fa9e4066Sahrens } 2516fa9e4066Sahrens 2517fa9e4066Sahrens /* 2518fa9e4066Sahrens * ========================================================================== 2519fa9e4066Sahrens * Generate and verify checksums 2520fa9e4066Sahrens * ========================================================================== 2521fa9e4066Sahrens */ 2522e05725b1Sbonwick static int 2523fa9e4066Sahrens zio_checksum_generate(zio_t *zio) 2524fa9e4066Sahrens { 2525fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2526e14bb325SJeff Bonwick enum zio_checksum checksum; 2527fa9e4066Sahrens 2528e14bb325SJeff Bonwick if (bp == NULL) { 2529e14bb325SJeff Bonwick /* 2530e14bb325SJeff Bonwick * This is zio_write_phys(). 2531e14bb325SJeff Bonwick * We're either generating a label checksum, or none at all. 2532e14bb325SJeff Bonwick */ 2533e14bb325SJeff Bonwick checksum = zio->io_prop.zp_checksum; 2534e14bb325SJeff Bonwick 2535e14bb325SJeff Bonwick if (checksum == ZIO_CHECKSUM_OFF) 2536e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2537fa9e4066Sahrens 2538e14bb325SJeff Bonwick ASSERT(checksum == ZIO_CHECKSUM_LABEL); 2539e14bb325SJeff Bonwick } else { 2540e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { 2541e14bb325SJeff Bonwick ASSERT(!IO_IS_ALLOCATING(zio)); 2542e14bb325SJeff Bonwick checksum = ZIO_CHECKSUM_GANG_HEADER; 2543e14bb325SJeff Bonwick } else { 2544e14bb325SJeff Bonwick checksum = BP_GET_CHECKSUM(bp); 2545e14bb325SJeff Bonwick } 2546e14bb325SJeff Bonwick } 2547fa9e4066Sahrens 2548e14bb325SJeff Bonwick zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); 2549fa9e4066Sahrens 2550e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2551fa9e4066Sahrens } 2552fa9e4066Sahrens 2553e05725b1Sbonwick static int 2554e14bb325SJeff Bonwick zio_checksum_verify(zio_t *zio) 2555fa9e4066Sahrens { 255622fe2c88SJonathan Adams zio_bad_cksum_t info; 2557e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2558e14bb325SJeff Bonwick int error; 2559fa9e4066Sahrens 2560b24ab676SJeff Bonwick ASSERT(zio->io_vd != NULL); 2561b24ab676SJeff Bonwick 2562e14bb325SJeff Bonwick if (bp == NULL) { 2563e14bb325SJeff Bonwick /* 2564e14bb325SJeff Bonwick * This is zio_read_phys(). 2565e14bb325SJeff Bonwick * We're either verifying a label checksum, or nothing at all. 2566e14bb325SJeff Bonwick */ 2567e14bb325SJeff Bonwick if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) 2568e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2569fa9e4066Sahrens 2570e14bb325SJeff Bonwick ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); 2571e14bb325SJeff Bonwick } 2572fa9e4066Sahrens 257322fe2c88SJonathan Adams if ((error = zio_checksum_error(zio, &info)) != 0) { 2574e14bb325SJeff Bonwick zio->io_error = error; 2575e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { 257622fe2c88SJonathan Adams zfs_ereport_start_checksum(zio->io_spa, 257722fe2c88SJonathan Adams zio->io_vd, zio, zio->io_offset, 257822fe2c88SJonathan Adams zio->io_size, NULL, &info); 2579e14bb325SJeff Bonwick } 2580fa9e4066Sahrens } 2581fa9e4066Sahrens 2582e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2583fa9e4066Sahrens } 2584fa9e4066Sahrens 2585fa9e4066Sahrens /* 2586fa9e4066Sahrens * Called by RAID-Z to ensure we don't compute the checksum twice. 2587fa9e4066Sahrens */ 2588fa9e4066Sahrens void 2589fa9e4066Sahrens zio_checksum_verified(zio_t *zio) 2590fa9e4066Sahrens { 2591b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 2592fa9e4066Sahrens } 2593fa9e4066Sahrens 2594fa9e4066Sahrens /* 2595e14bb325SJeff Bonwick * ========================================================================== 2596e14bb325SJeff Bonwick * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. 2597e14bb325SJeff Bonwick * An error of 0 indictes success. ENXIO indicates whole-device failure, 2598e14bb325SJeff Bonwick * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO 2599e14bb325SJeff Bonwick * indicate errors that are specific to one I/O, and most likely permanent. 2600e14bb325SJeff Bonwick * Any other error is presumed to be worse because we weren't expecting it. 2601e14bb325SJeff Bonwick * ========================================================================== 2602fa9e4066Sahrens */ 2603e14bb325SJeff Bonwick int 2604e14bb325SJeff Bonwick zio_worst_error(int e1, int e2) 2605fa9e4066Sahrens { 2606e14bb325SJeff Bonwick static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; 2607e14bb325SJeff Bonwick int r1, r2; 2608e14bb325SJeff Bonwick 2609e14bb325SJeff Bonwick for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) 2610e14bb325SJeff Bonwick if (e1 == zio_error_rank[r1]) 2611e14bb325SJeff Bonwick break; 2612e14bb325SJeff Bonwick 2613e14bb325SJeff Bonwick for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) 2614e14bb325SJeff Bonwick if (e2 == zio_error_rank[r2]) 2615e14bb325SJeff Bonwick break; 261644cd46caSbillm 2617e14bb325SJeff Bonwick return (r1 > r2 ? e1 : e2); 2618fa9e4066Sahrens } 2619fa9e4066Sahrens 2620fa9e4066Sahrens /* 2621fa9e4066Sahrens * ========================================================================== 2622e14bb325SJeff Bonwick * I/O completion 2623fa9e4066Sahrens * ========================================================================== 2624fa9e4066Sahrens */ 2625e14bb325SJeff Bonwick static int 2626e14bb325SJeff Bonwick zio_ready(zio_t *zio) 2627fa9e4066Sahrens { 2628e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2629a3f829aeSBill Moore zio_t *pio, *pio_next; 2630fa9e4066Sahrens 2631b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 2632b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_READY)) 2633f5383399SBill Moore return (ZIO_PIPELINE_STOP); 2634fa9e4066Sahrens 2635f5383399SBill Moore if (zio->io_ready) { 2636e14bb325SJeff Bonwick ASSERT(IO_IS_ALLOCATING(zio)); 2637e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2638e14bb325SJeff Bonwick ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); 2639fa9e4066Sahrens 2640e14bb325SJeff Bonwick zio->io_ready(zio); 2641e14bb325SJeff Bonwick } 2642fa9e4066Sahrens 2643e14bb325SJeff Bonwick if (bp != NULL && bp != &zio->io_bp_copy) 2644e14bb325SJeff Bonwick zio->io_bp_copy = *bp; 2645fa9e4066Sahrens 2646e14bb325SJeff Bonwick if (zio->io_error) 2647e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2648fa9e4066Sahrens 2649a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2650a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = 1; 2651a3f829aeSBill Moore pio = zio_walk_parents(zio); 2652a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2653a3f829aeSBill Moore 2654a3f829aeSBill Moore /* 2655a3f829aeSBill Moore * As we notify zio's parents, new parents could be added. 2656a3f829aeSBill Moore * New parents go to the head of zio's io_parent_list, however, 2657a3f829aeSBill Moore * so we will (correctly) not notify them. The remainder of zio's 2658a3f829aeSBill Moore * io_parent_list, from 'pio_next' onward, cannot change because 2659a3f829aeSBill Moore * all parents must wait for us to be done before they can be done. 2660a3f829aeSBill Moore */ 2661a3f829aeSBill Moore for (; pio != NULL; pio = pio_next) { 2662a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2663e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_READY); 2664a3f829aeSBill Moore } 2665fa9e4066Sahrens 2666b24ab676SJeff Bonwick if (zio->io_flags & ZIO_FLAG_NODATA) { 2667b24ab676SJeff Bonwick if (BP_IS_GANG(bp)) { 2668b24ab676SJeff Bonwick zio->io_flags &= ~ZIO_FLAG_NODATA; 2669b24ab676SJeff Bonwick } else { 2670b24ab676SJeff Bonwick ASSERT((uintptr_t)zio->io_data < SPA_MAXBLOCKSIZE); 2671b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 2672b24ab676SJeff Bonwick } 2673b24ab676SJeff Bonwick } 2674b24ab676SJeff Bonwick 2675a33cae98STim Haley if (zio_injection_enabled && 2676a33cae98STim Haley zio->io_spa->spa_syncing_txg == zio->io_txg) 2677a33cae98STim Haley zio_handle_ignored_writes(zio); 2678a33cae98STim Haley 2679e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2680fa9e4066Sahrens } 2681fa9e4066Sahrens 2682e14bb325SJeff Bonwick static int 2683e14bb325SJeff Bonwick zio_done(zio_t *zio) 2684d63d470bSgw { 2685e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 2686e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 2687e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2688e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2689e14bb325SJeff Bonwick uint64_t psize = zio->io_size; 2690a3f829aeSBill Moore zio_t *pio, *pio_next; 2691d63d470bSgw 2692e14bb325SJeff Bonwick /* 2693f5383399SBill Moore * If our children haven't all completed, 2694e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 2695e14bb325SJeff Bonwick */ 2696e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || 2697e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || 2698b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE) || 2699e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) 2700e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2701d63d470bSgw 2702e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 2703e14bb325SJeff Bonwick for (int w = 0; w < ZIO_WAIT_TYPES; w++) 2704e14bb325SJeff Bonwick ASSERT(zio->io_children[c][w] == 0); 2705e14bb325SJeff Bonwick 2706e14bb325SJeff Bonwick if (bp != NULL) { 2707e14bb325SJeff Bonwick ASSERT(bp->blk_pad[0] == 0); 2708e14bb325SJeff Bonwick ASSERT(bp->blk_pad[1] == 0); 2709e14bb325SJeff Bonwick ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || 2710a3f829aeSBill Moore (bp == zio_unique_parent(zio)->io_bp)); 2711e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && 2712b24ab676SJeff Bonwick zio->io_bp_override == NULL && 2713e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { 2714e14bb325SJeff Bonwick ASSERT(!BP_SHOULD_BYTESWAP(bp)); 2715b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(bp)); 2716e14bb325SJeff Bonwick ASSERT(BP_COUNT_GANG(bp) == 0 || 2717e14bb325SJeff Bonwick (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); 2718e14bb325SJeff Bonwick } 2719e14bb325SJeff Bonwick } 2720fa9e4066Sahrens 2721e14bb325SJeff Bonwick /* 2722b24ab676SJeff Bonwick * If there were child vdev/gang/ddt errors, they apply to us now. 2723e14bb325SJeff Bonwick */ 2724e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); 2725e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_GANG); 2726b24ab676SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_DDT); 2727b24ab676SJeff Bonwick 2728b24ab676SJeff Bonwick /* 2729b24ab676SJeff Bonwick * If the I/O on the transformed data was successful, generate any 2730b24ab676SJeff Bonwick * checksum reports now while we still have the transformed data. 2731b24ab676SJeff Bonwick */ 2732b24ab676SJeff Bonwick if (zio->io_error == 0) { 2733b24ab676SJeff Bonwick while (zio->io_cksum_report != NULL) { 2734b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 2735b24ab676SJeff Bonwick uint64_t align = zcr->zcr_align; 2736b24ab676SJeff Bonwick uint64_t asize = P2ROUNDUP(psize, align); 2737b24ab676SJeff Bonwick char *abuf = zio->io_data; 2738b24ab676SJeff Bonwick 2739b24ab676SJeff Bonwick if (asize != psize) { 2740b24ab676SJeff Bonwick abuf = zio_buf_alloc(asize); 2741b24ab676SJeff Bonwick bcopy(zio->io_data, abuf, psize); 2742b24ab676SJeff Bonwick bzero(abuf + psize, asize - psize); 2743b24ab676SJeff Bonwick } 2744b24ab676SJeff Bonwick 2745b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 2746b24ab676SJeff Bonwick zcr->zcr_next = NULL; 2747b24ab676SJeff Bonwick zcr->zcr_finish(zcr, abuf); 2748b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 2749b24ab676SJeff Bonwick 2750b24ab676SJeff Bonwick if (asize != psize) 2751b24ab676SJeff Bonwick zio_buf_free(abuf, asize); 2752b24ab676SJeff Bonwick } 2753b24ab676SJeff Bonwick } 2754e14bb325SJeff Bonwick 2755e14bb325SJeff Bonwick zio_pop_transforms(zio); /* note: may set zio->io_error */ 2756e14bb325SJeff Bonwick 2757e14bb325SJeff Bonwick vdev_stat_update(zio, psize); 2758e14bb325SJeff Bonwick 2759e14bb325SJeff Bonwick if (zio->io_error) { 2760e14bb325SJeff Bonwick /* 2761e14bb325SJeff Bonwick * If this I/O is attached to a particular vdev, 2762e14bb325SJeff Bonwick * generate an error message describing the I/O failure 2763e14bb325SJeff Bonwick * at the block level. We ignore these errors if the 2764e14bb325SJeff Bonwick * device is currently unavailable. 2765e14bb325SJeff Bonwick */ 2766e14bb325SJeff Bonwick if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) 2767e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, zio, 0, 0); 2768e14bb325SJeff Bonwick 27698f18d1faSGeorge Wilson if ((zio->io_error == EIO || !(zio->io_flags & 27708f18d1faSGeorge Wilson (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && 27718f18d1faSGeorge Wilson zio == lio) { 2772e14bb325SJeff Bonwick /* 2773e14bb325SJeff Bonwick * For logical I/O requests, tell the SPA to log the 2774e14bb325SJeff Bonwick * error and generate a logical data ereport. 2775e14bb325SJeff Bonwick */ 2776e14bb325SJeff Bonwick spa_log_error(spa, zio); 2777e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, zio, 2778e14bb325SJeff Bonwick 0, 0); 2779e14bb325SJeff Bonwick } 2780e14bb325SJeff Bonwick } 2781fa9e4066Sahrens 2782e14bb325SJeff Bonwick if (zio->io_error && zio == lio) { 2783e14bb325SJeff Bonwick /* 2784e14bb325SJeff Bonwick * Determine whether zio should be reexecuted. This will 2785e14bb325SJeff Bonwick * propagate all the way to the root via zio_notify_parent(). 2786e14bb325SJeff Bonwick */ 2787e14bb325SJeff Bonwick ASSERT(vd == NULL && bp != NULL); 2788b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2789e14bb325SJeff Bonwick 2790b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(zio) && 2791b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_CANFAIL)) { 2792e14bb325SJeff Bonwick if (zio->io_error != ENOSPC) 2793e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_NOW; 2794e14bb325SJeff Bonwick else 2795e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2796b24ab676SJeff Bonwick } 2797e14bb325SJeff Bonwick 2798e14bb325SJeff Bonwick if ((zio->io_type == ZIO_TYPE_READ || 2799e14bb325SJeff Bonwick zio->io_type == ZIO_TYPE_FREE) && 280044ecc532SGeorge Wilson !(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && 2801e14bb325SJeff Bonwick zio->io_error == ENXIO && 2802b16da2e2SGeorge Wilson spa_load_state(spa) == SPA_LOAD_NONE && 2803e14bb325SJeff Bonwick spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) 2804e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2805e14bb325SJeff Bonwick 2806e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) 2807e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 280822fe2c88SJonathan Adams 280922fe2c88SJonathan Adams /* 281022fe2c88SJonathan Adams * Here is a possibly good place to attempt to do 281122fe2c88SJonathan Adams * either combinatorial reconstruction or error correction 281222fe2c88SJonathan Adams * based on checksums. It also might be a good place 281322fe2c88SJonathan Adams * to send out preliminary ereports before we suspend 281422fe2c88SJonathan Adams * processing. 281522fe2c88SJonathan Adams */ 2816d63d470bSgw } 2817d63d470bSgw 281867bd71c6Sperrin /* 2819e14bb325SJeff Bonwick * If there were logical child errors, they apply to us now. 2820e14bb325SJeff Bonwick * We defer this until now to avoid conflating logical child 2821e14bb325SJeff Bonwick * errors with errors that happened to the zio itself when 2822e14bb325SJeff Bonwick * updating vdev stats and reporting FMA events above. 282367bd71c6Sperrin */ 2824e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); 28258654d025Sperrin 2826b24ab676SJeff Bonwick if ((zio->io_error || zio->io_reexecute) && 2827b24ab676SJeff Bonwick IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && 2828b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REWRITE)) 2829f5383399SBill Moore zio_dva_unallocate(zio, zio->io_gang_tree, bp); 2830f5383399SBill Moore 2831f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 2832f5383399SBill Moore 283333a372edSGeorge Wilson /* 283433a372edSGeorge Wilson * Godfather I/Os should never suspend. 283533a372edSGeorge Wilson */ 283633a372edSGeorge Wilson if ((zio->io_flags & ZIO_FLAG_GODFATHER) && 283733a372edSGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) 283833a372edSGeorge Wilson zio->io_reexecute = 0; 283933a372edSGeorge Wilson 284033a372edSGeorge Wilson if (zio->io_reexecute) { 2841e14bb325SJeff Bonwick /* 2842e14bb325SJeff Bonwick * This is a logical I/O that wants to reexecute. 2843e14bb325SJeff Bonwick * 2844e14bb325SJeff Bonwick * Reexecute is top-down. When an i/o fails, if it's not 2845e14bb325SJeff Bonwick * the root, it simply notifies its parent and sticks around. 2846e14bb325SJeff Bonwick * The parent, seeing that it still has children in zio_done(), 2847e14bb325SJeff Bonwick * does the same. This percolates all the way up to the root. 2848e14bb325SJeff Bonwick * The root i/o will reexecute or suspend the entire tree. 2849e14bb325SJeff Bonwick * 2850e14bb325SJeff Bonwick * This approach ensures that zio_reexecute() honors 2851e14bb325SJeff Bonwick * all the original i/o dependency relationships, e.g. 2852e14bb325SJeff Bonwick * parents not executing until children are ready. 2853e14bb325SJeff Bonwick */ 2854e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2855fa9e4066Sahrens 2856f5383399SBill Moore zio->io_gang_leader = NULL; 2857e14bb325SJeff Bonwick 2858a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2859a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 2860a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2861a3f829aeSBill Moore 286254d692b7SGeorge Wilson /* 286354d692b7SGeorge Wilson * "The Godfather" I/O monitors its children but is 286454d692b7SGeorge Wilson * not a true parent to them. It will track them through 286554d692b7SGeorge Wilson * the pipeline but severs its ties whenever they get into 286654d692b7SGeorge Wilson * trouble (e.g. suspended). This allows "The Godfather" 286754d692b7SGeorge Wilson * I/O to return status without blocking. 286854d692b7SGeorge Wilson */ 286954d692b7SGeorge Wilson for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 287054d692b7SGeorge Wilson zio_link_t *zl = zio->io_walk_link; 287154d692b7SGeorge Wilson pio_next = zio_walk_parents(zio); 287254d692b7SGeorge Wilson 287354d692b7SGeorge Wilson if ((pio->io_flags & ZIO_FLAG_GODFATHER) && 287454d692b7SGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { 287554d692b7SGeorge Wilson zio_remove_child(pio, zio, zl); 287654d692b7SGeorge Wilson zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 287754d692b7SGeorge Wilson } 287854d692b7SGeorge Wilson } 287954d692b7SGeorge Wilson 2880a3f829aeSBill Moore if ((pio = zio_unique_parent(zio)) != NULL) { 2881e14bb325SJeff Bonwick /* 2882e14bb325SJeff Bonwick * We're not a root i/o, so there's nothing to do 2883e14bb325SJeff Bonwick * but notify our parent. Don't propagate errors 2884e14bb325SJeff Bonwick * upward since we haven't permanently failed yet. 2885e14bb325SJeff Bonwick */ 288633a372edSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 2887e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; 2888e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2889e14bb325SJeff Bonwick } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { 2890e14bb325SJeff Bonwick /* 2891e14bb325SJeff Bonwick * We'd fail again if we reexecuted now, so suspend 2892e14bb325SJeff Bonwick * until conditions improve (e.g. device comes online). 2893e14bb325SJeff Bonwick */ 2894e14bb325SJeff Bonwick zio_suspend(spa, zio); 2895e14bb325SJeff Bonwick } else { 2896e14bb325SJeff Bonwick /* 2897e14bb325SJeff Bonwick * Reexecution is potentially a huge amount of work. 2898e14bb325SJeff Bonwick * Hand it off to the otherwise-unused claim taskq. 2899e14bb325SJeff Bonwick */ 2900*5aeb9474SGarrett D'Amore ASSERT(zio->io_tqent.tqent_next == NULL); 2901*5aeb9474SGarrett D'Amore (void) taskq_dispatch_ent( 2902e14bb325SJeff Bonwick spa->spa_zio_taskq[ZIO_TYPE_CLAIM][ZIO_TASKQ_ISSUE], 2903*5aeb9474SGarrett D'Amore (task_func_t *)zio_reexecute, zio, 0, 2904*5aeb9474SGarrett D'Amore &zio->io_tqent); 2905e14bb325SJeff Bonwick } 2906e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2907fa9e4066Sahrens } 2908fa9e4066Sahrens 2909b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 291033a372edSGeorge Wilson ASSERT(zio->io_reexecute == 0); 2911e14bb325SJeff Bonwick ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); 2912fa9e4066Sahrens 2913b24ab676SJeff Bonwick /* 2914b24ab676SJeff Bonwick * Report any checksum errors, since the I/O is complete. 2915b24ab676SJeff Bonwick */ 291622fe2c88SJonathan Adams while (zio->io_cksum_report != NULL) { 2917b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 2918b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 2919b24ab676SJeff Bonwick zcr->zcr_next = NULL; 2920b24ab676SJeff Bonwick zcr->zcr_finish(zcr, NULL); 2921b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 292222fe2c88SJonathan Adams } 292322fe2c88SJonathan Adams 2924a3f829aeSBill Moore /* 2925a3f829aeSBill Moore * It is the responsibility of the done callback to ensure that this 2926a3f829aeSBill Moore * particular zio is no longer discoverable for adoption, and as 2927a3f829aeSBill Moore * such, cannot acquire any new parents. 2928a3f829aeSBill Moore */ 2929e14bb325SJeff Bonwick if (zio->io_done) 2930e14bb325SJeff Bonwick zio->io_done(zio); 2931fa9e4066Sahrens 2932a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2933a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 2934a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2935fa9e4066Sahrens 2936a3f829aeSBill Moore for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 2937a3f829aeSBill Moore zio_link_t *zl = zio->io_walk_link; 2938a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2939a3f829aeSBill Moore zio_remove_child(pio, zio, zl); 2940e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2941e14bb325SJeff Bonwick } 2942fa9e4066Sahrens 2943e14bb325SJeff Bonwick if (zio->io_waiter != NULL) { 2944e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 2945e14bb325SJeff Bonwick zio->io_executor = NULL; 2946e14bb325SJeff Bonwick cv_broadcast(&zio->io_cv); 2947e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 2948e14bb325SJeff Bonwick } else { 2949e14bb325SJeff Bonwick zio_destroy(zio); 2950e14bb325SJeff Bonwick } 2951fa9e4066Sahrens 2952e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2953fa9e4066Sahrens } 295446341222Sperrin 295546341222Sperrin /* 2956e14bb325SJeff Bonwick * ========================================================================== 2957e14bb325SJeff Bonwick * I/O pipeline definition 2958e14bb325SJeff Bonwick * ========================================================================== 295946341222Sperrin */ 2960b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[] = { 2961e14bb325SJeff Bonwick NULL, 2962e14bb325SJeff Bonwick zio_read_bp_init, 2963b24ab676SJeff Bonwick zio_free_bp_init, 2964b24ab676SJeff Bonwick zio_issue_async, 2965e14bb325SJeff Bonwick zio_write_bp_init, 2966e14bb325SJeff Bonwick zio_checksum_generate, 2967b24ab676SJeff Bonwick zio_ddt_read_start, 2968b24ab676SJeff Bonwick zio_ddt_read_done, 2969b24ab676SJeff Bonwick zio_ddt_write, 2970b24ab676SJeff Bonwick zio_ddt_free, 2971e14bb325SJeff Bonwick zio_gang_assemble, 2972e14bb325SJeff Bonwick zio_gang_issue, 2973e14bb325SJeff Bonwick zio_dva_allocate, 2974e14bb325SJeff Bonwick zio_dva_free, 2975e14bb325SJeff Bonwick zio_dva_claim, 2976e14bb325SJeff Bonwick zio_ready, 2977e14bb325SJeff Bonwick zio_vdev_io_start, 2978e14bb325SJeff Bonwick zio_vdev_io_done, 2979e14bb325SJeff Bonwick zio_vdev_io_assess, 2980e14bb325SJeff Bonwick zio_checksum_verify, 2981e14bb325SJeff Bonwick zio_done 2982e14bb325SJeff Bonwick }; 2983