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 /* 22d58459f4Sek * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 27fa9e4066Sahrens 28fa9e4066Sahrens #include <sys/zfs_context.h> 29ea8dc4b6Seschrock #include <sys/fm/fs/zfs.h> 30fa9e4066Sahrens #include <sys/spa.h> 31fa9e4066Sahrens #include <sys/txg.h> 32fa9e4066Sahrens #include <sys/spa_impl.h> 33fa9e4066Sahrens #include <sys/vdev_impl.h> 34fa9e4066Sahrens #include <sys/zio_impl.h> 35fa9e4066Sahrens #include <sys/zio_compress.h> 36fa9e4066Sahrens #include <sys/zio_checksum.h> 37fa9e4066Sahrens 38fa9e4066Sahrens /* 39fa9e4066Sahrens * ========================================================================== 40fa9e4066Sahrens * I/O priority table 41fa9e4066Sahrens * ========================================================================== 42fa9e4066Sahrens */ 43fa9e4066Sahrens uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE] = { 44fa9e4066Sahrens 0, /* ZIO_PRIORITY_NOW */ 45fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_READ */ 46fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_WRITE */ 47fa9e4066Sahrens 6, /* ZIO_PRIORITY_ASYNC_READ */ 48fa9e4066Sahrens 4, /* ZIO_PRIORITY_ASYNC_WRITE */ 49fa9e4066Sahrens 4, /* ZIO_PRIORITY_FREE */ 50fa9e4066Sahrens 0, /* ZIO_PRIORITY_CACHE_FILL */ 51fa9e4066Sahrens 0, /* ZIO_PRIORITY_LOG_WRITE */ 52fa9e4066Sahrens 10, /* ZIO_PRIORITY_RESILVER */ 53fa9e4066Sahrens 20, /* ZIO_PRIORITY_SCRUB */ 54fa9e4066Sahrens }; 55fa9e4066Sahrens 56fa9e4066Sahrens /* 57fa9e4066Sahrens * ========================================================================== 58fa9e4066Sahrens * I/O type descriptions 59fa9e4066Sahrens * ========================================================================== 60fa9e4066Sahrens */ 61fa9e4066Sahrens char *zio_type_name[ZIO_TYPES] = { 62fa9e4066Sahrens "null", "read", "write", "free", "claim", "ioctl" }; 63fa9e4066Sahrens 64fa9e4066Sahrens /* At or above this size, force gang blocking - for testing */ 65fa9e4066Sahrens uint64_t zio_gang_bang = SPA_MAXBLOCKSIZE + 1; 66fa9e4066Sahrens 67fa9e4066Sahrens typedef struct zio_sync_pass { 68fa9e4066Sahrens int zp_defer_free; /* defer frees after this pass */ 69fa9e4066Sahrens int zp_dontcompress; /* don't compress after this pass */ 70fa9e4066Sahrens int zp_rewrite; /* rewrite new bps after this pass */ 71fa9e4066Sahrens } zio_sync_pass_t; 72fa9e4066Sahrens 73fa9e4066Sahrens zio_sync_pass_t zio_sync_pass = { 74fa9e4066Sahrens 1, /* zp_defer_free */ 75fa9e4066Sahrens 4, /* zp_dontcompress */ 76fa9e4066Sahrens 1, /* zp_rewrite */ 77fa9e4066Sahrens }; 78fa9e4066Sahrens 79fa9e4066Sahrens /* 80fa9e4066Sahrens * ========================================================================== 81fa9e4066Sahrens * I/O kmem caches 82fa9e4066Sahrens * ========================================================================== 83fa9e4066Sahrens */ 84fa9e4066Sahrens kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 85ad23a2dbSjohansen kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 86ad23a2dbSjohansen 87ad23a2dbSjohansen #ifdef _KERNEL 88ad23a2dbSjohansen extern vmem_t *zio_alloc_arena; 89ad23a2dbSjohansen #endif 90fa9e4066Sahrens 91fa9e4066Sahrens void 92fa9e4066Sahrens zio_init(void) 93fa9e4066Sahrens { 94fa9e4066Sahrens size_t c; 95ad23a2dbSjohansen vmem_t *data_alloc_arena = NULL; 96ad23a2dbSjohansen 97ad23a2dbSjohansen #ifdef _KERNEL 98ad23a2dbSjohansen data_alloc_arena = zio_alloc_arena; 99ad23a2dbSjohansen #endif 100fa9e4066Sahrens 101fa9e4066Sahrens /* 102fa9e4066Sahrens * For small buffers, we want a cache for each multiple of 103fa9e4066Sahrens * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache 104fa9e4066Sahrens * for each quarter-power of 2. For large buffers, we want 105fa9e4066Sahrens * a cache for each multiple of PAGESIZE. 106fa9e4066Sahrens */ 107fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 108fa9e4066Sahrens size_t size = (c + 1) << SPA_MINBLOCKSHIFT; 109fa9e4066Sahrens size_t p2 = size; 110fa9e4066Sahrens size_t align = 0; 111fa9e4066Sahrens 112fa9e4066Sahrens while (p2 & (p2 - 1)) 113fa9e4066Sahrens p2 &= p2 - 1; 114fa9e4066Sahrens 115fa9e4066Sahrens if (size <= 4 * SPA_MINBLOCKSIZE) { 116fa9e4066Sahrens align = SPA_MINBLOCKSIZE; 117fa9e4066Sahrens } else if (P2PHASE(size, PAGESIZE) == 0) { 118fa9e4066Sahrens align = PAGESIZE; 119fa9e4066Sahrens } else if (P2PHASE(size, p2 >> 2) == 0) { 120fa9e4066Sahrens align = p2 >> 2; 121fa9e4066Sahrens } 122fa9e4066Sahrens 123fa9e4066Sahrens if (align != 0) { 124ad23a2dbSjohansen char name[36]; 1255ad82045Snd (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); 126fa9e4066Sahrens zio_buf_cache[c] = kmem_cache_create(name, size, 127a0965f35Sbonwick align, NULL, NULL, NULL, NULL, NULL, KMC_NODEBUG); 128ad23a2dbSjohansen 129ad23a2dbSjohansen (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); 130ad23a2dbSjohansen zio_data_buf_cache[c] = kmem_cache_create(name, size, 131ad23a2dbSjohansen align, NULL, NULL, NULL, NULL, data_alloc_arena, 132ad23a2dbSjohansen KMC_NODEBUG); 133ad23a2dbSjohansen 134fa9e4066Sahrens dprintf("creating cache for size %5lx align %5lx\n", 135fa9e4066Sahrens size, align); 136fa9e4066Sahrens } 137fa9e4066Sahrens } 138fa9e4066Sahrens 139fa9e4066Sahrens while (--c != 0) { 140fa9e4066Sahrens ASSERT(zio_buf_cache[c] != NULL); 141fa9e4066Sahrens if (zio_buf_cache[c - 1] == NULL) 142fa9e4066Sahrens zio_buf_cache[c - 1] = zio_buf_cache[c]; 143ad23a2dbSjohansen 144ad23a2dbSjohansen ASSERT(zio_data_buf_cache[c] != NULL); 145ad23a2dbSjohansen if (zio_data_buf_cache[c - 1] == NULL) 146ad23a2dbSjohansen zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; 147fa9e4066Sahrens } 148ea8dc4b6Seschrock 149ea8dc4b6Seschrock zio_inject_init(); 150fa9e4066Sahrens } 151fa9e4066Sahrens 152fa9e4066Sahrens void 153fa9e4066Sahrens zio_fini(void) 154fa9e4066Sahrens { 155fa9e4066Sahrens size_t c; 156fa9e4066Sahrens kmem_cache_t *last_cache = NULL; 157ad23a2dbSjohansen kmem_cache_t *last_data_cache = NULL; 158fa9e4066Sahrens 159fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 160fa9e4066Sahrens if (zio_buf_cache[c] != last_cache) { 161fa9e4066Sahrens last_cache = zio_buf_cache[c]; 162fa9e4066Sahrens kmem_cache_destroy(zio_buf_cache[c]); 163fa9e4066Sahrens } 164fa9e4066Sahrens zio_buf_cache[c] = NULL; 165ad23a2dbSjohansen 166ad23a2dbSjohansen if (zio_data_buf_cache[c] != last_data_cache) { 167ad23a2dbSjohansen last_data_cache = zio_data_buf_cache[c]; 168ad23a2dbSjohansen kmem_cache_destroy(zio_data_buf_cache[c]); 169ad23a2dbSjohansen } 170ad23a2dbSjohansen zio_data_buf_cache[c] = NULL; 171fa9e4066Sahrens } 172ea8dc4b6Seschrock 173ea8dc4b6Seschrock zio_inject_fini(); 174fa9e4066Sahrens } 175fa9e4066Sahrens 176fa9e4066Sahrens /* 177fa9e4066Sahrens * ========================================================================== 178fa9e4066Sahrens * Allocate and free I/O buffers 179fa9e4066Sahrens * ========================================================================== 180fa9e4066Sahrens */ 181ad23a2dbSjohansen 182ad23a2dbSjohansen /* 183ad23a2dbSjohansen * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a 184ad23a2dbSjohansen * crashdump if the kernel panics, so use it judiciously. Obviously, it's 185ad23a2dbSjohansen * useful to inspect ZFS metadata, but if possible, we should avoid keeping 186ad23a2dbSjohansen * excess / transient data in-core during a crashdump. 187ad23a2dbSjohansen */ 188fa9e4066Sahrens void * 189fa9e4066Sahrens zio_buf_alloc(size_t size) 190fa9e4066Sahrens { 191fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 192fa9e4066Sahrens 193fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 194fa9e4066Sahrens 195fa9e4066Sahrens return (kmem_cache_alloc(zio_buf_cache[c], KM_SLEEP)); 196fa9e4066Sahrens } 197fa9e4066Sahrens 198ad23a2dbSjohansen /* 199ad23a2dbSjohansen * Use zio_data_buf_alloc to allocate data. The data will not appear in a 200ad23a2dbSjohansen * crashdump if the kernel panics. This exists so that we will limit the amount 201ad23a2dbSjohansen * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount 202ad23a2dbSjohansen * of kernel heap dumped to disk when the kernel panics) 203ad23a2dbSjohansen */ 204ad23a2dbSjohansen void * 205ad23a2dbSjohansen zio_data_buf_alloc(size_t size) 206ad23a2dbSjohansen { 207ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 208ad23a2dbSjohansen 209ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 210ad23a2dbSjohansen 211ad23a2dbSjohansen return (kmem_cache_alloc(zio_data_buf_cache[c], KM_SLEEP)); 212ad23a2dbSjohansen } 213ad23a2dbSjohansen 214fa9e4066Sahrens void 215fa9e4066Sahrens zio_buf_free(void *buf, size_t size) 216fa9e4066Sahrens { 217fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 218fa9e4066Sahrens 219fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 220fa9e4066Sahrens 221fa9e4066Sahrens kmem_cache_free(zio_buf_cache[c], buf); 222fa9e4066Sahrens } 223fa9e4066Sahrens 224ad23a2dbSjohansen void 225ad23a2dbSjohansen zio_data_buf_free(void *buf, size_t size) 226ad23a2dbSjohansen { 227ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 228ad23a2dbSjohansen 229ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 230ad23a2dbSjohansen 231ad23a2dbSjohansen kmem_cache_free(zio_data_buf_cache[c], buf); 232ad23a2dbSjohansen } 233*b3995adbSahrens 234fa9e4066Sahrens /* 235fa9e4066Sahrens * ========================================================================== 236fa9e4066Sahrens * Push and pop I/O transform buffers 237fa9e4066Sahrens * ========================================================================== 238fa9e4066Sahrens */ 239fa9e4066Sahrens static void 240fa9e4066Sahrens zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize) 241fa9e4066Sahrens { 242fa9e4066Sahrens zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); 243fa9e4066Sahrens 244fa9e4066Sahrens zt->zt_data = data; 245fa9e4066Sahrens zt->zt_size = size; 246fa9e4066Sahrens zt->zt_bufsize = bufsize; 247fa9e4066Sahrens 248fa9e4066Sahrens zt->zt_next = zio->io_transform_stack; 249fa9e4066Sahrens zio->io_transform_stack = zt; 250fa9e4066Sahrens 251fa9e4066Sahrens zio->io_data = data; 252fa9e4066Sahrens zio->io_size = size; 253fa9e4066Sahrens } 254fa9e4066Sahrens 255fa9e4066Sahrens static void 256fa9e4066Sahrens zio_pop_transform(zio_t *zio, void **data, uint64_t *size, uint64_t *bufsize) 257fa9e4066Sahrens { 258fa9e4066Sahrens zio_transform_t *zt = zio->io_transform_stack; 259fa9e4066Sahrens 260fa9e4066Sahrens *data = zt->zt_data; 261fa9e4066Sahrens *size = zt->zt_size; 262fa9e4066Sahrens *bufsize = zt->zt_bufsize; 263fa9e4066Sahrens 264fa9e4066Sahrens zio->io_transform_stack = zt->zt_next; 265fa9e4066Sahrens kmem_free(zt, sizeof (zio_transform_t)); 266fa9e4066Sahrens 267fa9e4066Sahrens if ((zt = zio->io_transform_stack) != NULL) { 268fa9e4066Sahrens zio->io_data = zt->zt_data; 269fa9e4066Sahrens zio->io_size = zt->zt_size; 270fa9e4066Sahrens } 271fa9e4066Sahrens } 272fa9e4066Sahrens 273fa9e4066Sahrens static void 274fa9e4066Sahrens zio_clear_transform_stack(zio_t *zio) 275fa9e4066Sahrens { 276fa9e4066Sahrens void *data; 277fa9e4066Sahrens uint64_t size, bufsize; 278fa9e4066Sahrens 279fa9e4066Sahrens ASSERT(zio->io_transform_stack != NULL); 280fa9e4066Sahrens 281fa9e4066Sahrens zio_pop_transform(zio, &data, &size, &bufsize); 282fa9e4066Sahrens while (zio->io_transform_stack != NULL) { 283fa9e4066Sahrens zio_buf_free(data, bufsize); 284fa9e4066Sahrens zio_pop_transform(zio, &data, &size, &bufsize); 285fa9e4066Sahrens } 286fa9e4066Sahrens } 287fa9e4066Sahrens 288fa9e4066Sahrens /* 289fa9e4066Sahrens * ========================================================================== 290fa9e4066Sahrens * Create the various types of I/O (read, write, free) 291fa9e4066Sahrens * ========================================================================== 292fa9e4066Sahrens */ 293fa9e4066Sahrens static zio_t * 294fa9e4066Sahrens zio_create(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 295fa9e4066Sahrens void *data, uint64_t size, zio_done_func_t *done, void *private, 296fa9e4066Sahrens zio_type_t type, int priority, int flags, uint8_t stage, uint32_t pipeline) 297fa9e4066Sahrens { 298fa9e4066Sahrens zio_t *zio; 299fa9e4066Sahrens 300fa9e4066Sahrens ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); 301fa9e4066Sahrens ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); 302fa9e4066Sahrens 303fa9e4066Sahrens zio = kmem_zalloc(sizeof (zio_t), KM_SLEEP); 304fa9e4066Sahrens zio->io_parent = pio; 305fa9e4066Sahrens zio->io_spa = spa; 306fa9e4066Sahrens zio->io_txg = txg; 307fa9e4066Sahrens if (bp != NULL) { 308fa9e4066Sahrens zio->io_bp = bp; 309fa9e4066Sahrens zio->io_bp_copy = *bp; 310fa9e4066Sahrens zio->io_bp_orig = *bp; 311fa9e4066Sahrens } 312fa9e4066Sahrens zio->io_done = done; 313fa9e4066Sahrens zio->io_private = private; 314fa9e4066Sahrens zio->io_type = type; 315fa9e4066Sahrens zio->io_priority = priority; 316fa9e4066Sahrens zio->io_stage = stage; 317fa9e4066Sahrens zio->io_pipeline = pipeline; 318fa9e4066Sahrens zio->io_async_stages = ZIO_ASYNC_PIPELINE_STAGES; 319fa9e4066Sahrens zio->io_timestamp = lbolt64; 320fa9e4066Sahrens zio->io_flags = flags; 3215ad82045Snd mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); 322fa9e4066Sahrens zio_push_transform(zio, data, size, size); 323fa9e4066Sahrens 324*b3995adbSahrens /* 325*b3995adbSahrens * Note on config lock: 326*b3995adbSahrens * 327*b3995adbSahrens * If CONFIG_HELD is set, then the caller already has the config 328*b3995adbSahrens * lock, so we don't need it for this io. 329*b3995adbSahrens * 330*b3995adbSahrens * We set CONFIG_GRABBED to indicate that we have grabbed the 331*b3995adbSahrens * config lock on behalf of this io, so it should be released 332*b3995adbSahrens * in zio_done. 333*b3995adbSahrens * 334*b3995adbSahrens * Unless CONFIG_HELD is set, we will grab the config lock for 335*b3995adbSahrens * any top-level (parent-less) io, *except* NULL top-level ios. 336*b3995adbSahrens * The NULL top-level ios rarely have any children, so we delay 337*b3995adbSahrens * grabbing the lock until the first child is added (but it is 338*b3995adbSahrens * still grabbed on behalf of the top-level i/o, so additional 339*b3995adbSahrens * children don't need to also grab it). This greatly reduces 340*b3995adbSahrens * contention on the config lock. 341*b3995adbSahrens */ 342fa9e4066Sahrens if (pio == NULL) { 343*b3995adbSahrens if (type != ZIO_TYPE_NULL && 344*b3995adbSahrens !(flags & ZIO_FLAG_CONFIG_HELD)) { 345ea8dc4b6Seschrock spa_config_enter(zio->io_spa, RW_READER, zio); 346*b3995adbSahrens zio->io_flags |= ZIO_FLAG_CONFIG_GRABBED; 347*b3995adbSahrens } 348fa9e4066Sahrens zio->io_root = zio; 349fa9e4066Sahrens } else { 350fa9e4066Sahrens zio->io_root = pio->io_root; 351ea8dc4b6Seschrock if (!(flags & ZIO_FLAG_NOBOOKMARK)) 352ea8dc4b6Seschrock zio->io_logical = pio->io_logical; 353fa9e4066Sahrens mutex_enter(&pio->io_lock); 354*b3995adbSahrens if (pio->io_parent == NULL && 355*b3995adbSahrens pio->io_type == ZIO_TYPE_NULL && 356*b3995adbSahrens !(pio->io_flags & ZIO_FLAG_CONFIG_GRABBED) && 357*b3995adbSahrens !(pio->io_flags & ZIO_FLAG_CONFIG_HELD)) { 358*b3995adbSahrens pio->io_flags |= ZIO_FLAG_CONFIG_GRABBED; 359*b3995adbSahrens spa_config_enter(zio->io_spa, RW_READER, pio); 360*b3995adbSahrens } 361fa9e4066Sahrens if (stage < ZIO_STAGE_READY) 362fa9e4066Sahrens pio->io_children_notready++; 363fa9e4066Sahrens pio->io_children_notdone++; 364fa9e4066Sahrens zio->io_sibling_next = pio->io_child; 365fa9e4066Sahrens zio->io_sibling_prev = NULL; 366fa9e4066Sahrens if (pio->io_child != NULL) 367fa9e4066Sahrens pio->io_child->io_sibling_prev = zio; 368fa9e4066Sahrens pio->io_child = zio; 36944cd46caSbillm zio->io_ndvas = pio->io_ndvas; 370fa9e4066Sahrens mutex_exit(&pio->io_lock); 371fa9e4066Sahrens } 372fa9e4066Sahrens 373fa9e4066Sahrens return (zio); 374fa9e4066Sahrens } 375fa9e4066Sahrens 376fa9e4066Sahrens zio_t * 377fa9e4066Sahrens zio_null(zio_t *pio, spa_t *spa, zio_done_func_t *done, void *private, 378fa9e4066Sahrens int flags) 379fa9e4066Sahrens { 380fa9e4066Sahrens zio_t *zio; 381fa9e4066Sahrens 382fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 383fa9e4066Sahrens ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, ZIO_STAGE_OPEN, 384fa9e4066Sahrens ZIO_WAIT_FOR_CHILDREN_PIPELINE); 385fa9e4066Sahrens 386fa9e4066Sahrens return (zio); 387fa9e4066Sahrens } 388fa9e4066Sahrens 389fa9e4066Sahrens zio_t * 390fa9e4066Sahrens zio_root(spa_t *spa, zio_done_func_t *done, void *private, int flags) 391fa9e4066Sahrens { 392fa9e4066Sahrens return (zio_null(NULL, spa, done, private, flags)); 393fa9e4066Sahrens } 394fa9e4066Sahrens 395fa9e4066Sahrens zio_t * 396fa9e4066Sahrens zio_read(zio_t *pio, spa_t *spa, blkptr_t *bp, void *data, 397fa9e4066Sahrens uint64_t size, zio_done_func_t *done, void *private, 398ea8dc4b6Seschrock int priority, int flags, zbookmark_t *zb) 399fa9e4066Sahrens { 400fa9e4066Sahrens zio_t *zio; 401fa9e4066Sahrens 402fa9e4066Sahrens ASSERT3U(size, ==, BP_GET_LSIZE(bp)); 403fa9e4066Sahrens 404fa9e4066Sahrens zio = zio_create(pio, spa, bp->blk_birth, bp, data, size, done, private, 405faafa6e3Sahrens ZIO_TYPE_READ, priority, flags | ZIO_FLAG_USER, 406faafa6e3Sahrens ZIO_STAGE_OPEN, ZIO_READ_PIPELINE); 407ea8dc4b6Seschrock zio->io_bookmark = *zb; 408ea8dc4b6Seschrock 409ea8dc4b6Seschrock zio->io_logical = zio; 410fa9e4066Sahrens 411fa9e4066Sahrens /* 412fa9e4066Sahrens * Work off our copy of the bp so the caller can free it. 413fa9e4066Sahrens */ 414fa9e4066Sahrens zio->io_bp = &zio->io_bp_copy; 415fa9e4066Sahrens 416fa9e4066Sahrens if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF) { 417fa9e4066Sahrens uint64_t csize = BP_GET_PSIZE(bp); 418fa9e4066Sahrens void *cbuf = zio_buf_alloc(csize); 419fa9e4066Sahrens 420fa9e4066Sahrens zio_push_transform(zio, cbuf, csize, csize); 421fa9e4066Sahrens zio->io_pipeline |= 1U << ZIO_STAGE_READ_DECOMPRESS; 422fa9e4066Sahrens } 423fa9e4066Sahrens 42444cd46caSbillm if (BP_IS_GANG(bp)) { 425fa9e4066Sahrens uint64_t gsize = SPA_GANGBLOCKSIZE; 426fa9e4066Sahrens void *gbuf = zio_buf_alloc(gsize); 427fa9e4066Sahrens 428fa9e4066Sahrens zio_push_transform(zio, gbuf, gsize, gsize); 429fa9e4066Sahrens zio->io_pipeline |= 1U << ZIO_STAGE_READ_GANG_MEMBERS; 430fa9e4066Sahrens } 431fa9e4066Sahrens 432fa9e4066Sahrens return (zio); 433fa9e4066Sahrens } 434fa9e4066Sahrens 435fa9e4066Sahrens zio_t * 43644cd46caSbillm zio_write(zio_t *pio, spa_t *spa, int checksum, int compress, int ncopies, 437fa9e4066Sahrens uint64_t txg, blkptr_t *bp, void *data, uint64_t size, 438ea8dc4b6Seschrock zio_done_func_t *done, void *private, int priority, int flags, 439ea8dc4b6Seschrock zbookmark_t *zb) 440fa9e4066Sahrens { 441fa9e4066Sahrens zio_t *zio; 442fa9e4066Sahrens 443fa9e4066Sahrens ASSERT(checksum >= ZIO_CHECKSUM_OFF && 444fa9e4066Sahrens checksum < ZIO_CHECKSUM_FUNCTIONS); 445fa9e4066Sahrens 446fa9e4066Sahrens ASSERT(compress >= ZIO_COMPRESS_OFF && 447fa9e4066Sahrens compress < ZIO_COMPRESS_FUNCTIONS); 448fa9e4066Sahrens 449fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 450faafa6e3Sahrens ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_USER, 451fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PIPELINE); 452fa9e4066Sahrens 453ea8dc4b6Seschrock zio->io_bookmark = *zb; 454ea8dc4b6Seschrock 455ea8dc4b6Seschrock zio->io_logical = zio; 456ea8dc4b6Seschrock 457fa9e4066Sahrens zio->io_checksum = checksum; 458fa9e4066Sahrens zio->io_compress = compress; 45944cd46caSbillm zio->io_ndvas = ncopies; 460fa9e4066Sahrens 461fa9e4066Sahrens if (compress != ZIO_COMPRESS_OFF) 462fa9e4066Sahrens zio->io_async_stages |= 1U << ZIO_STAGE_WRITE_COMPRESS; 463fa9e4066Sahrens 464fa9e4066Sahrens if (bp->blk_birth != txg) { 465fa9e4066Sahrens /* XXX the bp usually (always?) gets re-zeroed later */ 466fa9e4066Sahrens BP_ZERO(bp); 467fa9e4066Sahrens BP_SET_LSIZE(bp, size); 468fa9e4066Sahrens BP_SET_PSIZE(bp, size); 46944cd46caSbillm } else { 47044cd46caSbillm /* Make sure someone doesn't change their mind on overwrites */ 47144cd46caSbillm ASSERT(MIN(zio->io_ndvas + BP_IS_GANG(bp), 47244cd46caSbillm spa_max_replication(spa)) == BP_GET_NDVAS(bp)); 473fa9e4066Sahrens } 474fa9e4066Sahrens 475fa9e4066Sahrens return (zio); 476fa9e4066Sahrens } 477fa9e4066Sahrens 478fa9e4066Sahrens zio_t * 479fa9e4066Sahrens zio_rewrite(zio_t *pio, spa_t *spa, int checksum, 480fa9e4066Sahrens uint64_t txg, blkptr_t *bp, void *data, uint64_t size, 481ea8dc4b6Seschrock zio_done_func_t *done, void *private, int priority, int flags, 482ea8dc4b6Seschrock zbookmark_t *zb) 483fa9e4066Sahrens { 484fa9e4066Sahrens zio_t *zio; 485fa9e4066Sahrens 486fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 487faafa6e3Sahrens ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_USER, 488fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); 489fa9e4066Sahrens 490ea8dc4b6Seschrock zio->io_bookmark = *zb; 491fa9e4066Sahrens zio->io_checksum = checksum; 492fa9e4066Sahrens zio->io_compress = ZIO_COMPRESS_OFF; 493fa9e4066Sahrens 49444cd46caSbillm if (pio != NULL) 49544cd46caSbillm ASSERT3U(zio->io_ndvas, <=, BP_GET_NDVAS(bp)); 49644cd46caSbillm 497fa9e4066Sahrens return (zio); 498fa9e4066Sahrens } 499fa9e4066Sahrens 500fa9e4066Sahrens static zio_t * 501fa9e4066Sahrens zio_write_allocate(zio_t *pio, spa_t *spa, int checksum, 502fa9e4066Sahrens uint64_t txg, blkptr_t *bp, void *data, uint64_t size, 503fa9e4066Sahrens zio_done_func_t *done, void *private, int priority, int flags) 504fa9e4066Sahrens { 505fa9e4066Sahrens zio_t *zio; 506fa9e4066Sahrens 507fa9e4066Sahrens BP_ZERO(bp); 508fa9e4066Sahrens BP_SET_LSIZE(bp, size); 509fa9e4066Sahrens BP_SET_PSIZE(bp, size); 510fa9e4066Sahrens BP_SET_COMPRESS(bp, ZIO_COMPRESS_OFF); 511fa9e4066Sahrens 512fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 513fa9e4066Sahrens ZIO_TYPE_WRITE, priority, flags, 514fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_ALLOCATE_PIPELINE); 515fa9e4066Sahrens 516fa9e4066Sahrens zio->io_checksum = checksum; 517fa9e4066Sahrens zio->io_compress = ZIO_COMPRESS_OFF; 518fa9e4066Sahrens 519fa9e4066Sahrens return (zio); 520fa9e4066Sahrens } 521fa9e4066Sahrens 522fa9e4066Sahrens zio_t * 523fa9e4066Sahrens zio_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 524fa9e4066Sahrens zio_done_func_t *done, void *private) 525fa9e4066Sahrens { 526fa9e4066Sahrens zio_t *zio; 527fa9e4066Sahrens 528fa9e4066Sahrens ASSERT(!BP_IS_HOLE(bp)); 529fa9e4066Sahrens 530fa9e4066Sahrens if (txg == spa->spa_syncing_txg && 531fa9e4066Sahrens spa->spa_sync_pass > zio_sync_pass.zp_defer_free) { 532fa9e4066Sahrens bplist_enqueue_deferred(&spa->spa_sync_bplist, bp); 533fa9e4066Sahrens return (zio_null(pio, spa, NULL, NULL, 0)); 534fa9e4066Sahrens } 535fa9e4066Sahrens 536fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, NULL, 0, done, private, 537faafa6e3Sahrens ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, ZIO_FLAG_USER, 538fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_FREE_PIPELINE); 539fa9e4066Sahrens 540fa9e4066Sahrens zio->io_bp = &zio->io_bp_copy; 541fa9e4066Sahrens 542fa9e4066Sahrens return (zio); 543fa9e4066Sahrens } 544fa9e4066Sahrens 545fa9e4066Sahrens zio_t * 546fa9e4066Sahrens zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 547fa9e4066Sahrens zio_done_func_t *done, void *private) 548fa9e4066Sahrens { 549fa9e4066Sahrens zio_t *zio; 550fa9e4066Sahrens 551fa9e4066Sahrens /* 552fa9e4066Sahrens * A claim is an allocation of a specific block. Claims are needed 553fa9e4066Sahrens * to support immediate writes in the intent log. The issue is that 554fa9e4066Sahrens * immediate writes contain committed data, but in a txg that was 555fa9e4066Sahrens * *not* committed. Upon opening the pool after an unclean shutdown, 556fa9e4066Sahrens * the intent log claims all blocks that contain immediate write data 557fa9e4066Sahrens * so that the SPA knows they're in use. 558fa9e4066Sahrens * 559fa9e4066Sahrens * All claims *must* be resolved in the first txg -- before the SPA 560fa9e4066Sahrens * starts allocating blocks -- so that nothing is allocated twice. 561fa9e4066Sahrens */ 562fa9e4066Sahrens ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); 563fa9e4066Sahrens ASSERT3U(spa_first_txg(spa), <=, txg); 564fa9e4066Sahrens 565fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, NULL, 0, done, private, 566fa9e4066Sahrens ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, 0, 567fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); 568fa9e4066Sahrens 569fa9e4066Sahrens zio->io_bp = &zio->io_bp_copy; 570fa9e4066Sahrens 571fa9e4066Sahrens return (zio); 572fa9e4066Sahrens } 573fa9e4066Sahrens 574fa9e4066Sahrens zio_t * 575fa9e4066Sahrens zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 576fa9e4066Sahrens zio_done_func_t *done, void *private, int priority, int flags) 577fa9e4066Sahrens { 578fa9e4066Sahrens zio_t *zio; 579fa9e4066Sahrens int c; 580fa9e4066Sahrens 581fa9e4066Sahrens if (vd->vdev_children == 0) { 582fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 583fa9e4066Sahrens ZIO_TYPE_IOCTL, priority, flags, 584fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); 585fa9e4066Sahrens 586fa9e4066Sahrens zio->io_vd = vd; 587fa9e4066Sahrens zio->io_cmd = cmd; 588fa9e4066Sahrens } else { 589fa9e4066Sahrens zio = zio_null(pio, spa, NULL, NULL, flags); 590fa9e4066Sahrens 591fa9e4066Sahrens for (c = 0; c < vd->vdev_children; c++) 592fa9e4066Sahrens zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, 593fa9e4066Sahrens done, private, priority, flags)); 594fa9e4066Sahrens } 595fa9e4066Sahrens 596fa9e4066Sahrens return (zio); 597fa9e4066Sahrens } 598fa9e4066Sahrens 599fa9e4066Sahrens static void 600fa9e4066Sahrens zio_phys_bp_init(vdev_t *vd, blkptr_t *bp, uint64_t offset, uint64_t size, 601fa9e4066Sahrens int checksum) 602fa9e4066Sahrens { 603fa9e4066Sahrens ASSERT(vd->vdev_children == 0); 604fa9e4066Sahrens 605fa9e4066Sahrens ASSERT(size <= SPA_MAXBLOCKSIZE); 606fa9e4066Sahrens ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); 607fa9e4066Sahrens ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); 608fa9e4066Sahrens 609fa9e4066Sahrens ASSERT(offset + size <= VDEV_LABEL_START_SIZE || 610fa9e4066Sahrens offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 611fa9e4066Sahrens ASSERT3U(offset + size, <=, vd->vdev_psize); 612fa9e4066Sahrens 613fa9e4066Sahrens BP_ZERO(bp); 614fa9e4066Sahrens 615fa9e4066Sahrens BP_SET_LSIZE(bp, size); 616fa9e4066Sahrens BP_SET_PSIZE(bp, size); 617fa9e4066Sahrens 618fa9e4066Sahrens BP_SET_CHECKSUM(bp, checksum); 619fa9e4066Sahrens BP_SET_COMPRESS(bp, ZIO_COMPRESS_OFF); 620fa9e4066Sahrens BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 621fa9e4066Sahrens 622fa9e4066Sahrens if (checksum != ZIO_CHECKSUM_OFF) 623fa9e4066Sahrens ZIO_SET_CHECKSUM(&bp->blk_cksum, offset, 0, 0, 0); 624fa9e4066Sahrens } 625fa9e4066Sahrens 626fa9e4066Sahrens zio_t * 627fa9e4066Sahrens zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 628fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 629fa9e4066Sahrens int priority, int flags) 630fa9e4066Sahrens { 631fa9e4066Sahrens zio_t *zio; 632fa9e4066Sahrens blkptr_t blk; 633fa9e4066Sahrens 634fa9e4066Sahrens zio_phys_bp_init(vd, &blk, offset, size, checksum); 635fa9e4066Sahrens 636fa9e4066Sahrens zio = zio_create(pio, vd->vdev_spa, 0, &blk, data, size, done, private, 637fa9e4066Sahrens ZIO_TYPE_READ, priority, flags | ZIO_FLAG_PHYSICAL, 638fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); 639fa9e4066Sahrens 640fa9e4066Sahrens zio->io_vd = vd; 641fa9e4066Sahrens zio->io_offset = offset; 642fa9e4066Sahrens 643fa9e4066Sahrens /* 644fa9e4066Sahrens * Work off our copy of the bp so the caller can free it. 645fa9e4066Sahrens */ 646fa9e4066Sahrens zio->io_bp = &zio->io_bp_copy; 647fa9e4066Sahrens 648fa9e4066Sahrens return (zio); 649fa9e4066Sahrens } 650fa9e4066Sahrens 651fa9e4066Sahrens zio_t * 652fa9e4066Sahrens zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 653fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 654fa9e4066Sahrens int priority, int flags) 655fa9e4066Sahrens { 656fa9e4066Sahrens zio_block_tail_t *zbt; 657fa9e4066Sahrens void *wbuf; 658fa9e4066Sahrens zio_t *zio; 659fa9e4066Sahrens blkptr_t blk; 660fa9e4066Sahrens 661fa9e4066Sahrens zio_phys_bp_init(vd, &blk, offset, size, checksum); 662fa9e4066Sahrens 663fa9e4066Sahrens zio = zio_create(pio, vd->vdev_spa, 0, &blk, data, size, done, private, 664fa9e4066Sahrens ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_PHYSICAL, 665fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); 666fa9e4066Sahrens 667fa9e4066Sahrens zio->io_vd = vd; 668fa9e4066Sahrens zio->io_offset = offset; 669fa9e4066Sahrens 670fa9e4066Sahrens zio->io_bp = &zio->io_bp_copy; 671fa9e4066Sahrens zio->io_checksum = checksum; 672fa9e4066Sahrens 673fa9e4066Sahrens if (zio_checksum_table[checksum].ci_zbt) { 674fa9e4066Sahrens /* 675fa9e4066Sahrens * zbt checksums are necessarily destructive -- they modify 676fa9e4066Sahrens * one word of the write buffer to hold the verifier/checksum. 677fa9e4066Sahrens * Therefore, we must make a local copy in case the data is 678fa9e4066Sahrens * being written to multiple places. 679fa9e4066Sahrens */ 680fa9e4066Sahrens wbuf = zio_buf_alloc(size); 681fa9e4066Sahrens bcopy(data, wbuf, size); 682fa9e4066Sahrens zio_push_transform(zio, wbuf, size, size); 683fa9e4066Sahrens 684fa9e4066Sahrens zbt = (zio_block_tail_t *)((char *)wbuf + size) - 1; 685fa9e4066Sahrens zbt->zbt_cksum = blk.blk_cksum; 686fa9e4066Sahrens } 687fa9e4066Sahrens 688fa9e4066Sahrens return (zio); 689fa9e4066Sahrens } 690fa9e4066Sahrens 691fa9e4066Sahrens /* 692fa9e4066Sahrens * Create a child I/O to do some work for us. It has no associated bp. 693fa9e4066Sahrens */ 694fa9e4066Sahrens zio_t * 695fa9e4066Sahrens zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, uint64_t offset, 696fa9e4066Sahrens void *data, uint64_t size, int type, int priority, int flags, 697fa9e4066Sahrens zio_done_func_t *done, void *private) 698fa9e4066Sahrens { 699fa9e4066Sahrens uint32_t pipeline = ZIO_VDEV_CHILD_PIPELINE; 700fa9e4066Sahrens zio_t *cio; 701fa9e4066Sahrens 702fa9e4066Sahrens if (type == ZIO_TYPE_READ && bp != NULL) { 703fa9e4066Sahrens /* 704fa9e4066Sahrens * If we have the bp, then the child should perform the 705fa9e4066Sahrens * checksum and the parent need not. This pushes error 706fa9e4066Sahrens * detection as close to the leaves as possible and 707fa9e4066Sahrens * eliminates redundant checksums in the interior nodes. 708fa9e4066Sahrens */ 709fa9e4066Sahrens pipeline |= 1U << ZIO_STAGE_CHECKSUM_VERIFY; 710fa9e4066Sahrens zio->io_pipeline &= ~(1U << ZIO_STAGE_CHECKSUM_VERIFY); 711fa9e4066Sahrens } 712fa9e4066Sahrens 713fa9e4066Sahrens cio = zio_create(zio, zio->io_spa, zio->io_txg, bp, data, size, 714fa9e4066Sahrens done, private, type, priority, 715fa9e4066Sahrens (zio->io_flags & ZIO_FLAG_VDEV_INHERIT) | ZIO_FLAG_CANFAIL | flags, 71644cd46caSbillm ZIO_STAGE_VDEV_IO_START - 1, pipeline); 717fa9e4066Sahrens 718fa9e4066Sahrens cio->io_vd = vd; 719fa9e4066Sahrens cio->io_offset = offset; 720fa9e4066Sahrens 721fa9e4066Sahrens return (cio); 722fa9e4066Sahrens } 723fa9e4066Sahrens 724fa9e4066Sahrens /* 725fa9e4066Sahrens * ========================================================================== 726fa9e4066Sahrens * Initiate I/O, either sync or async 727fa9e4066Sahrens * ========================================================================== 728fa9e4066Sahrens */ 729fa9e4066Sahrens int 730fa9e4066Sahrens zio_wait(zio_t *zio) 731fa9e4066Sahrens { 732fa9e4066Sahrens int error; 733fa9e4066Sahrens 734fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 735fa9e4066Sahrens 736fa9e4066Sahrens zio->io_waiter = curthread; 737fa9e4066Sahrens 738fa9e4066Sahrens zio_next_stage_async(zio); 739fa9e4066Sahrens 740fa9e4066Sahrens mutex_enter(&zio->io_lock); 741fa9e4066Sahrens while (zio->io_stalled != ZIO_STAGE_DONE) 742fa9e4066Sahrens cv_wait(&zio->io_cv, &zio->io_lock); 743fa9e4066Sahrens mutex_exit(&zio->io_lock); 744fa9e4066Sahrens 745fa9e4066Sahrens error = zio->io_error; 7465ad82045Snd mutex_destroy(&zio->io_lock); 747fa9e4066Sahrens kmem_free(zio, sizeof (zio_t)); 748fa9e4066Sahrens 749fa9e4066Sahrens return (error); 750fa9e4066Sahrens } 751fa9e4066Sahrens 752fa9e4066Sahrens void 753fa9e4066Sahrens zio_nowait(zio_t *zio) 754fa9e4066Sahrens { 755fa9e4066Sahrens zio_next_stage_async(zio); 756fa9e4066Sahrens } 757fa9e4066Sahrens 758fa9e4066Sahrens /* 759fa9e4066Sahrens * ========================================================================== 760fa9e4066Sahrens * I/O pipeline interlocks: parent/child dependency scoreboarding 761fa9e4066Sahrens * ========================================================================== 762fa9e4066Sahrens */ 763fa9e4066Sahrens static void 764fa9e4066Sahrens zio_wait_for_children(zio_t *zio, uint32_t stage, uint64_t *countp) 765fa9e4066Sahrens { 766fa9e4066Sahrens mutex_enter(&zio->io_lock); 767fa9e4066Sahrens if (*countp == 0) { 768fa9e4066Sahrens ASSERT(zio->io_stalled == 0); 769fa9e4066Sahrens mutex_exit(&zio->io_lock); 770fa9e4066Sahrens zio_next_stage(zio); 771fa9e4066Sahrens } else { 772fa9e4066Sahrens zio->io_stalled = stage; 773fa9e4066Sahrens mutex_exit(&zio->io_lock); 774fa9e4066Sahrens } 775fa9e4066Sahrens } 776fa9e4066Sahrens 777fa9e4066Sahrens static void 778fa9e4066Sahrens zio_notify_parent(zio_t *zio, uint32_t stage, uint64_t *countp) 779fa9e4066Sahrens { 780fa9e4066Sahrens zio_t *pio = zio->io_parent; 781fa9e4066Sahrens 782fa9e4066Sahrens mutex_enter(&pio->io_lock); 783fa9e4066Sahrens if (pio->io_error == 0 && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 784fa9e4066Sahrens pio->io_error = zio->io_error; 785fa9e4066Sahrens if (--*countp == 0 && pio->io_stalled == stage) { 786fa9e4066Sahrens pio->io_stalled = 0; 787fa9e4066Sahrens mutex_exit(&pio->io_lock); 788fa9e4066Sahrens zio_next_stage_async(pio); 789fa9e4066Sahrens } else { 790fa9e4066Sahrens mutex_exit(&pio->io_lock); 791fa9e4066Sahrens } 792fa9e4066Sahrens } 793fa9e4066Sahrens 794fa9e4066Sahrens static void 795fa9e4066Sahrens zio_wait_children_ready(zio_t *zio) 796fa9e4066Sahrens { 797fa9e4066Sahrens zio_wait_for_children(zio, ZIO_STAGE_WAIT_CHILDREN_READY, 798fa9e4066Sahrens &zio->io_children_notready); 799fa9e4066Sahrens } 800fa9e4066Sahrens 801fa9e4066Sahrens void 802fa9e4066Sahrens zio_wait_children_done(zio_t *zio) 803fa9e4066Sahrens { 804fa9e4066Sahrens zio_wait_for_children(zio, ZIO_STAGE_WAIT_CHILDREN_DONE, 805fa9e4066Sahrens &zio->io_children_notdone); 806fa9e4066Sahrens } 807fa9e4066Sahrens 808fa9e4066Sahrens static void 809fa9e4066Sahrens zio_ready(zio_t *zio) 810fa9e4066Sahrens { 811fa9e4066Sahrens zio_t *pio = zio->io_parent; 812fa9e4066Sahrens 813fa9e4066Sahrens if (pio != NULL) 814fa9e4066Sahrens zio_notify_parent(zio, ZIO_STAGE_WAIT_CHILDREN_READY, 815fa9e4066Sahrens &pio->io_children_notready); 816fa9e4066Sahrens 817fa9e4066Sahrens if (zio->io_bp) 818fa9e4066Sahrens zio->io_bp_copy = *zio->io_bp; 819fa9e4066Sahrens 820fa9e4066Sahrens zio_next_stage(zio); 821fa9e4066Sahrens } 822fa9e4066Sahrens 823fa9e4066Sahrens static void 824fa9e4066Sahrens zio_done(zio_t *zio) 825fa9e4066Sahrens { 826fa9e4066Sahrens zio_t *pio = zio->io_parent; 827fa9e4066Sahrens spa_t *spa = zio->io_spa; 828fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 829fa9e4066Sahrens vdev_t *vd = zio->io_vd; 830fa9e4066Sahrens 831fa9e4066Sahrens ASSERT(zio->io_children_notready == 0); 832fa9e4066Sahrens ASSERT(zio->io_children_notdone == 0); 833fa9e4066Sahrens 834fa9e4066Sahrens if (bp != NULL) { 835fa9e4066Sahrens ASSERT(bp->blk_pad[0] == 0); 836fa9e4066Sahrens ASSERT(bp->blk_pad[1] == 0); 837fa9e4066Sahrens ASSERT(bp->blk_pad[2] == 0); 838fa9e4066Sahrens ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0); 839fa9e4066Sahrens if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && 84044cd46caSbillm !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { 841fa9e4066Sahrens ASSERT(!BP_SHOULD_BYTESWAP(bp)); 84244cd46caSbillm if (zio->io_ndvas != 0) 84344cd46caSbillm ASSERT3U(zio->io_ndvas, <=, BP_GET_NDVAS(bp)); 84444cd46caSbillm ASSERT(BP_COUNT_GANG(bp) == 0 || 84544cd46caSbillm (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); 84644cd46caSbillm } 847fa9e4066Sahrens } 848fa9e4066Sahrens 849fa9e4066Sahrens if (vd != NULL) 850fa9e4066Sahrens vdev_stat_update(zio); 851fa9e4066Sahrens 852fa9e4066Sahrens if (zio->io_error) { 853ea8dc4b6Seschrock /* 854ea8dc4b6Seschrock * If this I/O is attached to a particular vdev, 855ea8dc4b6Seschrock * generate an error message describing the I/O failure 856ea8dc4b6Seschrock * at the block level. We ignore these errors if the 857ea8dc4b6Seschrock * device is currently unavailable. 858ea8dc4b6Seschrock */ 859ecc2d604Sbonwick if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) 860ea8dc4b6Seschrock zfs_ereport_post(FM_EREPORT_ZFS_IO, 861ecc2d604Sbonwick zio->io_spa, vd, zio, 0, 0); 862ea8dc4b6Seschrock 863ea8dc4b6Seschrock if ((zio->io_error == EIO || 864ea8dc4b6Seschrock !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) && 865ea8dc4b6Seschrock zio->io_logical == zio) { 866ea8dc4b6Seschrock /* 867ea8dc4b6Seschrock * For root I/O requests, tell the SPA to log the error 868ea8dc4b6Seschrock * appropriately. Also, generate a logical data 869ea8dc4b6Seschrock * ereport. 870ea8dc4b6Seschrock */ 871ea8dc4b6Seschrock spa_log_error(zio->io_spa, zio); 872ea8dc4b6Seschrock 873ea8dc4b6Seschrock zfs_ereport_post(FM_EREPORT_ZFS_DATA, 874ea8dc4b6Seschrock zio->io_spa, NULL, zio, 0, 0); 875ea8dc4b6Seschrock } 876fa9e4066Sahrens 877ea8dc4b6Seschrock /* 878ea8dc4b6Seschrock * For I/O requests that cannot fail, panic appropriately. 879ea8dc4b6Seschrock */ 880ea8dc4b6Seschrock if (!(zio->io_flags & ZIO_FLAG_CANFAIL)) { 881d58459f4Sek char *blkbuf; 882d58459f4Sek 883d58459f4Sek blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_NOSLEEP); 884d58459f4Sek if (blkbuf) { 885d58459f4Sek sprintf_blkptr(blkbuf, BP_SPRINTF_LEN, 886d58459f4Sek bp ? bp : &zio->io_bp_copy); 887d58459f4Sek } 888ea8dc4b6Seschrock panic("ZFS: %s (%s on %s off %llx: zio %p %s): error " 889ea8dc4b6Seschrock "%d", zio->io_error == ECKSUM ? 890ea8dc4b6Seschrock "bad checksum" : "I/O failure", 891ea8dc4b6Seschrock zio_type_name[zio->io_type], 892ea8dc4b6Seschrock vdev_description(vd), 893ea8dc4b6Seschrock (u_longlong_t)zio->io_offset, 894d58459f4Sek zio, blkbuf ? blkbuf : "", zio->io_error); 895ea8dc4b6Seschrock } 896fa9e4066Sahrens } 897fa9e4066Sahrens zio_clear_transform_stack(zio); 898fa9e4066Sahrens 899fa9e4066Sahrens if (zio->io_done) 900fa9e4066Sahrens zio->io_done(zio); 901fa9e4066Sahrens 902fa9e4066Sahrens ASSERT(zio->io_delegate_list == NULL); 903fa9e4066Sahrens ASSERT(zio->io_delegate_next == NULL); 904fa9e4066Sahrens 905fa9e4066Sahrens if (pio != NULL) { 906fa9e4066Sahrens zio_t *next, *prev; 907fa9e4066Sahrens 908fa9e4066Sahrens mutex_enter(&pio->io_lock); 909fa9e4066Sahrens next = zio->io_sibling_next; 910fa9e4066Sahrens prev = zio->io_sibling_prev; 911fa9e4066Sahrens if (next != NULL) 912fa9e4066Sahrens next->io_sibling_prev = prev; 913fa9e4066Sahrens if (prev != NULL) 914fa9e4066Sahrens prev->io_sibling_next = next; 915fa9e4066Sahrens if (pio->io_child == zio) 916fa9e4066Sahrens pio->io_child = next; 917fa9e4066Sahrens mutex_exit(&pio->io_lock); 918fa9e4066Sahrens 919fa9e4066Sahrens zio_notify_parent(zio, ZIO_STAGE_WAIT_CHILDREN_DONE, 920fa9e4066Sahrens &pio->io_children_notdone); 921fa9e4066Sahrens } 922fa9e4066Sahrens 923*b3995adbSahrens /* 924*b3995adbSahrens * Note: this I/O is now done, and will shortly be 925*b3995adbSahrens * kmem_free()'d, so there is no need to clear this (or any 926*b3995adbSahrens * other) flag. 927*b3995adbSahrens */ 928*b3995adbSahrens if (zio->io_flags & ZIO_FLAG_CONFIG_GRABBED) 929ea8dc4b6Seschrock spa_config_exit(spa, zio); 930fa9e4066Sahrens 931fa9e4066Sahrens if (zio->io_waiter != NULL) { 932fa9e4066Sahrens mutex_enter(&zio->io_lock); 933fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_DONE); 934fa9e4066Sahrens zio->io_stalled = zio->io_stage; 935fa9e4066Sahrens cv_broadcast(&zio->io_cv); 936fa9e4066Sahrens mutex_exit(&zio->io_lock); 937fa9e4066Sahrens } else { 938fa9e4066Sahrens kmem_free(zio, sizeof (zio_t)); 939fa9e4066Sahrens } 940fa9e4066Sahrens } 941fa9e4066Sahrens 942fa9e4066Sahrens /* 943fa9e4066Sahrens * ========================================================================== 944fa9e4066Sahrens * Compression support 945fa9e4066Sahrens * ========================================================================== 946fa9e4066Sahrens */ 947fa9e4066Sahrens static void 948fa9e4066Sahrens zio_write_compress(zio_t *zio) 949fa9e4066Sahrens { 950fa9e4066Sahrens int compress = zio->io_compress; 951fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 952fa9e4066Sahrens void *cbuf; 953fa9e4066Sahrens uint64_t lsize = zio->io_size; 954fa9e4066Sahrens uint64_t csize = lsize; 955fa9e4066Sahrens uint64_t cbufsize = 0; 956fa9e4066Sahrens int pass; 957fa9e4066Sahrens 958fa9e4066Sahrens if (bp->blk_birth == zio->io_txg) { 959fa9e4066Sahrens /* 960fa9e4066Sahrens * We're rewriting an existing block, which means we're 961fa9e4066Sahrens * working on behalf of spa_sync(). For spa_sync() to 962fa9e4066Sahrens * converge, it must eventually be the case that we don't 963fa9e4066Sahrens * have to allocate new blocks. But compression changes 964fa9e4066Sahrens * the blocksize, which forces a reallocate, and makes 965fa9e4066Sahrens * convergence take longer. Therefore, after the first 966fa9e4066Sahrens * few passes, stop compressing to ensure convergence. 967fa9e4066Sahrens */ 968fa9e4066Sahrens pass = spa_sync_pass(zio->io_spa); 969fa9e4066Sahrens if (pass > zio_sync_pass.zp_dontcompress) 970fa9e4066Sahrens compress = ZIO_COMPRESS_OFF; 971fa9e4066Sahrens } else { 972fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 973fa9e4066Sahrens pass = 1; 974fa9e4066Sahrens } 975fa9e4066Sahrens 976fa9e4066Sahrens if (compress != ZIO_COMPRESS_OFF) 977fa9e4066Sahrens if (!zio_compress_data(compress, zio->io_data, zio->io_size, 978fa9e4066Sahrens &cbuf, &csize, &cbufsize)) 979fa9e4066Sahrens compress = ZIO_COMPRESS_OFF; 980fa9e4066Sahrens 981fa9e4066Sahrens if (compress != ZIO_COMPRESS_OFF && csize != 0) 982fa9e4066Sahrens zio_push_transform(zio, cbuf, csize, cbufsize); 983fa9e4066Sahrens 984fa9e4066Sahrens /* 985fa9e4066Sahrens * The final pass of spa_sync() must be all rewrites, but the first 986fa9e4066Sahrens * few passes offer a trade-off: allocating blocks defers convergence, 987fa9e4066Sahrens * but newly allocated blocks are sequential, so they can be written 988fa9e4066Sahrens * to disk faster. Therefore, we allow the first few passes of 989fa9e4066Sahrens * spa_sync() to reallocate new blocks, but force rewrites after that. 990fa9e4066Sahrens * There should only be a handful of blocks after pass 1 in any case. 991fa9e4066Sahrens */ 992fa9e4066Sahrens if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == csize && 993fa9e4066Sahrens pass > zio_sync_pass.zp_rewrite) { 994fa9e4066Sahrens ASSERT(csize != 0); 995a2eea2e1Sahrens BP_SET_LSIZE(bp, lsize); 996a2eea2e1Sahrens BP_SET_COMPRESS(bp, compress); 997fa9e4066Sahrens zio->io_pipeline = ZIO_REWRITE_PIPELINE; 998fa9e4066Sahrens } else { 999fa9e4066Sahrens if (bp->blk_birth == zio->io_txg) { 1000fa9e4066Sahrens ASSERT3U(BP_GET_LSIZE(bp), ==, lsize); 1001fa9e4066Sahrens bzero(bp, sizeof (blkptr_t)); 1002fa9e4066Sahrens } 1003fa9e4066Sahrens if (csize == 0) { 1004fa9e4066Sahrens BP_ZERO(bp); 1005fa9e4066Sahrens zio->io_pipeline = ZIO_WAIT_FOR_CHILDREN_PIPELINE; 1006fa9e4066Sahrens } else { 100744cd46caSbillm ASSERT3U(BP_GET_NDVAS(bp), ==, 0); 1008fa9e4066Sahrens BP_SET_LSIZE(bp, lsize); 1009fa9e4066Sahrens BP_SET_PSIZE(bp, csize); 1010fa9e4066Sahrens BP_SET_COMPRESS(bp, compress); 1011fa9e4066Sahrens zio->io_pipeline = ZIO_WRITE_ALLOCATE_PIPELINE; 1012fa9e4066Sahrens } 1013fa9e4066Sahrens } 1014fa9e4066Sahrens 1015fa9e4066Sahrens zio_next_stage(zio); 1016fa9e4066Sahrens } 1017fa9e4066Sahrens 1018fa9e4066Sahrens static void 1019fa9e4066Sahrens zio_read_decompress(zio_t *zio) 1020fa9e4066Sahrens { 1021fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 1022fa9e4066Sahrens void *data; 1023fa9e4066Sahrens uint64_t size; 1024fa9e4066Sahrens uint64_t bufsize; 1025fa9e4066Sahrens int compress = BP_GET_COMPRESS(bp); 1026fa9e4066Sahrens 1027fa9e4066Sahrens ASSERT(compress != ZIO_COMPRESS_OFF); 1028fa9e4066Sahrens 1029fa9e4066Sahrens zio_pop_transform(zio, &data, &size, &bufsize); 1030fa9e4066Sahrens 1031fa9e4066Sahrens if (zio_decompress_data(compress, data, size, 1032fa9e4066Sahrens zio->io_data, zio->io_size)) 1033fa9e4066Sahrens zio->io_error = EIO; 1034fa9e4066Sahrens 1035fa9e4066Sahrens zio_buf_free(data, bufsize); 1036fa9e4066Sahrens 1037fa9e4066Sahrens zio_next_stage(zio); 1038fa9e4066Sahrens } 1039fa9e4066Sahrens 1040fa9e4066Sahrens /* 1041fa9e4066Sahrens * ========================================================================== 1042fa9e4066Sahrens * Gang block support 1043fa9e4066Sahrens * ========================================================================== 1044fa9e4066Sahrens */ 1045fa9e4066Sahrens static void 1046fa9e4066Sahrens zio_gang_pipeline(zio_t *zio) 1047fa9e4066Sahrens { 1048fa9e4066Sahrens /* 1049fa9e4066Sahrens * By default, the pipeline assumes that we're dealing with a gang 1050fa9e4066Sahrens * block. If we're not, strip out any gang-specific stages. 1051fa9e4066Sahrens */ 105244cd46caSbillm if (!BP_IS_GANG(zio->io_bp)) 1053fa9e4066Sahrens zio->io_pipeline &= ~ZIO_GANG_STAGES; 1054fa9e4066Sahrens 1055fa9e4066Sahrens zio_next_stage(zio); 1056fa9e4066Sahrens } 1057fa9e4066Sahrens 1058fa9e4066Sahrens static void 1059fa9e4066Sahrens zio_gang_byteswap(zio_t *zio) 1060fa9e4066Sahrens { 1061fa9e4066Sahrens ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); 1062fa9e4066Sahrens 1063fa9e4066Sahrens if (BP_SHOULD_BYTESWAP(zio->io_bp)) 1064fa9e4066Sahrens byteswap_uint64_array(zio->io_data, zio->io_size); 1065fa9e4066Sahrens } 1066fa9e4066Sahrens 1067fa9e4066Sahrens static void 1068fa9e4066Sahrens zio_get_gang_header(zio_t *zio) 1069fa9e4066Sahrens { 1070fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 1071fa9e4066Sahrens uint64_t gsize = SPA_GANGBLOCKSIZE; 1072fa9e4066Sahrens void *gbuf = zio_buf_alloc(gsize); 1073fa9e4066Sahrens 107444cd46caSbillm ASSERT(BP_IS_GANG(bp)); 1075fa9e4066Sahrens 1076fa9e4066Sahrens zio_push_transform(zio, gbuf, gsize, gsize); 1077fa9e4066Sahrens 1078fa9e4066Sahrens zio_nowait(zio_create(zio, zio->io_spa, bp->blk_birth, bp, gbuf, gsize, 1079fa9e4066Sahrens NULL, NULL, ZIO_TYPE_READ, zio->io_priority, 1080fa9e4066Sahrens zio->io_flags & ZIO_FLAG_GANG_INHERIT, 1081fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_READ_PIPELINE)); 1082fa9e4066Sahrens 1083fa9e4066Sahrens zio_wait_children_done(zio); 1084fa9e4066Sahrens } 1085fa9e4066Sahrens 1086fa9e4066Sahrens static void 1087fa9e4066Sahrens zio_read_gang_members(zio_t *zio) 1088fa9e4066Sahrens { 1089fa9e4066Sahrens zio_gbh_phys_t *gbh; 1090fa9e4066Sahrens uint64_t gsize, gbufsize, loff, lsize; 1091fa9e4066Sahrens int i; 1092fa9e4066Sahrens 109344cd46caSbillm ASSERT(BP_IS_GANG(zio->io_bp)); 1094fa9e4066Sahrens 1095fa9e4066Sahrens zio_gang_byteswap(zio); 1096fa9e4066Sahrens zio_pop_transform(zio, (void **)&gbh, &gsize, &gbufsize); 1097fa9e4066Sahrens 1098fa9e4066Sahrens for (loff = 0, i = 0; loff != zio->io_size; loff += lsize, i++) { 1099fa9e4066Sahrens blkptr_t *gbp = &gbh->zg_blkptr[i]; 1100fa9e4066Sahrens lsize = BP_GET_PSIZE(gbp); 1101fa9e4066Sahrens 1102fa9e4066Sahrens ASSERT(BP_GET_COMPRESS(gbp) == ZIO_COMPRESS_OFF); 1103fa9e4066Sahrens ASSERT3U(lsize, ==, BP_GET_LSIZE(gbp)); 1104fa9e4066Sahrens ASSERT3U(loff + lsize, <=, zio->io_size); 1105fa9e4066Sahrens ASSERT(i < SPA_GBH_NBLKPTRS); 1106fa9e4066Sahrens ASSERT(!BP_IS_HOLE(gbp)); 1107fa9e4066Sahrens 1108fa9e4066Sahrens zio_nowait(zio_read(zio, zio->io_spa, gbp, 1109fa9e4066Sahrens (char *)zio->io_data + loff, lsize, NULL, NULL, 1110ea8dc4b6Seschrock zio->io_priority, zio->io_flags & ZIO_FLAG_GANG_INHERIT, 1111ea8dc4b6Seschrock &zio->io_bookmark)); 1112fa9e4066Sahrens } 1113fa9e4066Sahrens 1114fa9e4066Sahrens zio_buf_free(gbh, gbufsize); 1115fa9e4066Sahrens zio_wait_children_done(zio); 1116fa9e4066Sahrens } 1117fa9e4066Sahrens 1118fa9e4066Sahrens static void 1119fa9e4066Sahrens zio_rewrite_gang_members(zio_t *zio) 1120fa9e4066Sahrens { 1121fa9e4066Sahrens zio_gbh_phys_t *gbh; 1122fa9e4066Sahrens uint64_t gsize, gbufsize, loff, lsize; 1123fa9e4066Sahrens int i; 1124fa9e4066Sahrens 112544cd46caSbillm ASSERT(BP_IS_GANG(zio->io_bp)); 1126fa9e4066Sahrens ASSERT3U(zio->io_size, ==, SPA_GANGBLOCKSIZE); 1127fa9e4066Sahrens 1128fa9e4066Sahrens zio_gang_byteswap(zio); 1129fa9e4066Sahrens zio_pop_transform(zio, (void **)&gbh, &gsize, &gbufsize); 1130fa9e4066Sahrens 1131fa9e4066Sahrens ASSERT(gsize == gbufsize); 1132fa9e4066Sahrens 1133fa9e4066Sahrens for (loff = 0, i = 0; loff != zio->io_size; loff += lsize, i++) { 1134fa9e4066Sahrens blkptr_t *gbp = &gbh->zg_blkptr[i]; 1135fa9e4066Sahrens lsize = BP_GET_PSIZE(gbp); 1136fa9e4066Sahrens 1137fa9e4066Sahrens ASSERT(BP_GET_COMPRESS(gbp) == ZIO_COMPRESS_OFF); 1138fa9e4066Sahrens ASSERT3U(lsize, ==, BP_GET_LSIZE(gbp)); 1139fa9e4066Sahrens ASSERT3U(loff + lsize, <=, zio->io_size); 1140fa9e4066Sahrens ASSERT(i < SPA_GBH_NBLKPTRS); 1141fa9e4066Sahrens ASSERT(!BP_IS_HOLE(gbp)); 1142fa9e4066Sahrens 1143fa9e4066Sahrens zio_nowait(zio_rewrite(zio, zio->io_spa, zio->io_checksum, 1144fa9e4066Sahrens zio->io_txg, gbp, (char *)zio->io_data + loff, lsize, 1145ea8dc4b6Seschrock NULL, NULL, zio->io_priority, zio->io_flags, 1146ea8dc4b6Seschrock &zio->io_bookmark)); 1147fa9e4066Sahrens } 1148fa9e4066Sahrens 1149fa9e4066Sahrens zio_push_transform(zio, gbh, gsize, gbufsize); 1150fa9e4066Sahrens zio_wait_children_ready(zio); 1151fa9e4066Sahrens } 1152fa9e4066Sahrens 1153fa9e4066Sahrens static void 1154fa9e4066Sahrens zio_free_gang_members(zio_t *zio) 1155fa9e4066Sahrens { 1156fa9e4066Sahrens zio_gbh_phys_t *gbh; 1157fa9e4066Sahrens uint64_t gsize, gbufsize; 1158fa9e4066Sahrens int i; 1159fa9e4066Sahrens 116044cd46caSbillm ASSERT(BP_IS_GANG(zio->io_bp)); 1161fa9e4066Sahrens 1162fa9e4066Sahrens zio_gang_byteswap(zio); 1163fa9e4066Sahrens zio_pop_transform(zio, (void **)&gbh, &gsize, &gbufsize); 1164fa9e4066Sahrens 1165fa9e4066Sahrens for (i = 0; i < SPA_GBH_NBLKPTRS; i++) { 1166fa9e4066Sahrens blkptr_t *gbp = &gbh->zg_blkptr[i]; 1167fa9e4066Sahrens 1168fa9e4066Sahrens if (BP_IS_HOLE(gbp)) 1169fa9e4066Sahrens continue; 1170fa9e4066Sahrens zio_nowait(zio_free(zio, zio->io_spa, zio->io_txg, 1171fa9e4066Sahrens gbp, NULL, NULL)); 1172fa9e4066Sahrens } 1173fa9e4066Sahrens 1174fa9e4066Sahrens zio_buf_free(gbh, gbufsize); 1175fa9e4066Sahrens zio_next_stage(zio); 1176fa9e4066Sahrens } 1177fa9e4066Sahrens 1178fa9e4066Sahrens static void 1179fa9e4066Sahrens zio_claim_gang_members(zio_t *zio) 1180fa9e4066Sahrens { 1181fa9e4066Sahrens zio_gbh_phys_t *gbh; 1182fa9e4066Sahrens uint64_t gsize, gbufsize; 1183fa9e4066Sahrens int i; 1184fa9e4066Sahrens 118544cd46caSbillm ASSERT(BP_IS_GANG(zio->io_bp)); 1186fa9e4066Sahrens 1187fa9e4066Sahrens zio_gang_byteswap(zio); 1188fa9e4066Sahrens zio_pop_transform(zio, (void **)&gbh, &gsize, &gbufsize); 1189fa9e4066Sahrens 1190fa9e4066Sahrens for (i = 0; i < SPA_GBH_NBLKPTRS; i++) { 1191fa9e4066Sahrens blkptr_t *gbp = &gbh->zg_blkptr[i]; 1192fa9e4066Sahrens if (BP_IS_HOLE(gbp)) 1193fa9e4066Sahrens continue; 1194fa9e4066Sahrens zio_nowait(zio_claim(zio, zio->io_spa, zio->io_txg, 1195fa9e4066Sahrens gbp, NULL, NULL)); 1196fa9e4066Sahrens } 1197fa9e4066Sahrens 1198fa9e4066Sahrens zio_buf_free(gbh, gbufsize); 1199fa9e4066Sahrens zio_next_stage(zio); 1200fa9e4066Sahrens } 1201fa9e4066Sahrens 1202fa9e4066Sahrens static void 1203fa9e4066Sahrens zio_write_allocate_gang_member_done(zio_t *zio) 1204fa9e4066Sahrens { 1205fa9e4066Sahrens zio_t *pio = zio->io_parent; 120644cd46caSbillm dva_t *cdva = zio->io_bp->blk_dva; 120744cd46caSbillm dva_t *pdva = pio->io_bp->blk_dva; 1208fa9e4066Sahrens uint64_t asize; 120944cd46caSbillm int d; 1210fa9e4066Sahrens 121144cd46caSbillm ASSERT3U(pio->io_ndvas, ==, zio->io_ndvas); 121244cd46caSbillm ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); 121344cd46caSbillm ASSERT3U(zio->io_ndvas, <=, BP_GET_NDVAS(zio->io_bp)); 121444cd46caSbillm ASSERT3U(pio->io_ndvas, <=, BP_GET_NDVAS(pio->io_bp)); 1215fa9e4066Sahrens 1216fa9e4066Sahrens mutex_enter(&pio->io_lock); 121744cd46caSbillm for (d = 0; d < BP_GET_NDVAS(pio->io_bp); d++) { 121844cd46caSbillm ASSERT(DVA_GET_GANG(&pdva[d])); 121944cd46caSbillm asize = DVA_GET_ASIZE(&pdva[d]); 122044cd46caSbillm asize += DVA_GET_ASIZE(&cdva[d]); 122144cd46caSbillm DVA_SET_ASIZE(&pdva[d], asize); 122244cd46caSbillm } 1223fa9e4066Sahrens mutex_exit(&pio->io_lock); 1224fa9e4066Sahrens } 1225fa9e4066Sahrens 1226fa9e4066Sahrens static void 1227fa9e4066Sahrens zio_write_allocate_gang_members(zio_t *zio) 1228fa9e4066Sahrens { 1229fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 123044cd46caSbillm dva_t *dva = bp->blk_dva; 123144cd46caSbillm spa_t *spa = zio->io_spa; 1232fa9e4066Sahrens zio_gbh_phys_t *gbh; 123344cd46caSbillm uint64_t txg = zio->io_txg; 1234fa9e4066Sahrens uint64_t resid = zio->io_size; 1235fa9e4066Sahrens uint64_t maxalloc = P2ROUNDUP(zio->io_size >> 1, SPA_MINBLOCKSIZE); 1236fa9e4066Sahrens uint64_t gsize, loff, lsize; 1237fa9e4066Sahrens uint32_t gbps_left; 123844cd46caSbillm int ndvas = zio->io_ndvas; 123944cd46caSbillm int gbh_ndvas = MIN(ndvas + 1, spa_max_replication(spa)); 1240fa9e4066Sahrens int error; 124144cd46caSbillm int i, d; 1242fa9e4066Sahrens 1243fa9e4066Sahrens gsize = SPA_GANGBLOCKSIZE; 1244fa9e4066Sahrens gbps_left = SPA_GBH_NBLKPTRS; 1245fa9e4066Sahrens 124667bd71c6Sperrin error = metaslab_alloc(spa, gsize, bp, gbh_ndvas, txg, NULL, B_FALSE); 1247fa9e4066Sahrens if (error == ENOSPC) 1248fa9e4066Sahrens panic("can't allocate gang block header"); 1249fa9e4066Sahrens ASSERT(error == 0); 1250fa9e4066Sahrens 125144cd46caSbillm for (d = 0; d < gbh_ndvas; d++) 125244cd46caSbillm DVA_SET_GANG(&dva[d], 1); 1253fa9e4066Sahrens 125444cd46caSbillm bp->blk_birth = txg; 1255fa9e4066Sahrens 1256fa9e4066Sahrens gbh = zio_buf_alloc(gsize); 1257fa9e4066Sahrens bzero(gbh, gsize); 1258fa9e4066Sahrens 125944cd46caSbillm /* We need to test multi-level gang blocks */ 126044cd46caSbillm if (maxalloc >= zio_gang_bang && (lbolt & 0x1) == 0) 126144cd46caSbillm maxalloc = MAX(maxalloc >> 2, SPA_MINBLOCKSIZE); 126244cd46caSbillm 1263fa9e4066Sahrens for (loff = 0, i = 0; loff != zio->io_size; 1264fa9e4066Sahrens loff += lsize, resid -= lsize, gbps_left--, i++) { 1265fa9e4066Sahrens blkptr_t *gbp = &gbh->zg_blkptr[i]; 126644cd46caSbillm dva = gbp->blk_dva; 1267fa9e4066Sahrens 1268fa9e4066Sahrens ASSERT(gbps_left != 0); 1269fa9e4066Sahrens maxalloc = MIN(maxalloc, resid); 1270fa9e4066Sahrens 1271fa9e4066Sahrens while (resid <= maxalloc * gbps_left) { 127244cd46caSbillm error = metaslab_alloc(spa, maxalloc, gbp, ndvas, 127367bd71c6Sperrin txg, bp, B_FALSE); 1274fa9e4066Sahrens if (error == 0) 1275fa9e4066Sahrens break; 1276fa9e4066Sahrens ASSERT3U(error, ==, ENOSPC); 1277fa9e4066Sahrens if (maxalloc == SPA_MINBLOCKSIZE) 1278fa9e4066Sahrens panic("really out of space"); 1279fa9e4066Sahrens maxalloc = P2ROUNDUP(maxalloc >> 1, SPA_MINBLOCKSIZE); 1280fa9e4066Sahrens } 1281fa9e4066Sahrens 1282fa9e4066Sahrens if (resid <= maxalloc * gbps_left) { 1283fa9e4066Sahrens lsize = maxalloc; 1284fa9e4066Sahrens BP_SET_LSIZE(gbp, lsize); 1285fa9e4066Sahrens BP_SET_PSIZE(gbp, lsize); 1286fa9e4066Sahrens BP_SET_COMPRESS(gbp, ZIO_COMPRESS_OFF); 128744cd46caSbillm gbp->blk_birth = txg; 128844cd46caSbillm zio_nowait(zio_rewrite(zio, spa, 128944cd46caSbillm zio->io_checksum, txg, gbp, 1290fa9e4066Sahrens (char *)zio->io_data + loff, lsize, 1291fa9e4066Sahrens zio_write_allocate_gang_member_done, NULL, 1292ea8dc4b6Seschrock zio->io_priority, zio->io_flags, 1293ea8dc4b6Seschrock &zio->io_bookmark)); 1294fa9e4066Sahrens } else { 1295fa9e4066Sahrens lsize = P2ROUNDUP(resid / gbps_left, SPA_MINBLOCKSIZE); 1296fa9e4066Sahrens ASSERT(lsize != SPA_MINBLOCKSIZE); 129744cd46caSbillm zio_nowait(zio_write_allocate(zio, spa, 129844cd46caSbillm zio->io_checksum, txg, gbp, 1299fa9e4066Sahrens (char *)zio->io_data + loff, lsize, 1300fa9e4066Sahrens zio_write_allocate_gang_member_done, NULL, 1301fa9e4066Sahrens zio->io_priority, zio->io_flags)); 1302fa9e4066Sahrens } 1303fa9e4066Sahrens } 1304fa9e4066Sahrens 1305fa9e4066Sahrens ASSERT(resid == 0 && loff == zio->io_size); 1306fa9e4066Sahrens 1307fa9e4066Sahrens zio->io_pipeline |= 1U << ZIO_STAGE_GANG_CHECKSUM_GENERATE; 1308fa9e4066Sahrens 1309fa9e4066Sahrens zio_push_transform(zio, gbh, gsize, gsize); 131044cd46caSbillm /* 131144cd46caSbillm * As much as we'd like this to be zio_wait_children_ready(), 131244cd46caSbillm * updating our ASIZE doesn't happen until the io_done callback, 131344cd46caSbillm * so we have to wait for that to finish in order for our BP 131444cd46caSbillm * to be stable. 131544cd46caSbillm */ 1316fa9e4066Sahrens zio_wait_children_done(zio); 1317fa9e4066Sahrens } 1318fa9e4066Sahrens 1319fa9e4066Sahrens /* 1320fa9e4066Sahrens * ========================================================================== 1321fa9e4066Sahrens * Allocate and free blocks 1322fa9e4066Sahrens * ========================================================================== 1323fa9e4066Sahrens */ 1324fa9e4066Sahrens static void 1325fa9e4066Sahrens zio_dva_allocate(zio_t *zio) 1326fa9e4066Sahrens { 1327fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 1328fa9e4066Sahrens int error; 1329fa9e4066Sahrens 1330fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 133144cd46caSbillm ASSERT3U(BP_GET_NDVAS(bp), ==, 0); 133244cd46caSbillm ASSERT3U(zio->io_ndvas, >, 0); 133344cd46caSbillm ASSERT3U(zio->io_ndvas, <=, spa_max_replication(zio->io_spa)); 1334fa9e4066Sahrens 1335fa9e4066Sahrens /* For testing, make some blocks above a certain size be gang blocks */ 1336fa9e4066Sahrens if (zio->io_size >= zio_gang_bang && (lbolt & 0x3) == 0) { 1337fa9e4066Sahrens zio_write_allocate_gang_members(zio); 1338fa9e4066Sahrens return; 1339fa9e4066Sahrens } 1340fa9e4066Sahrens 1341fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 1342fa9e4066Sahrens 134344cd46caSbillm error = metaslab_alloc(zio->io_spa, zio->io_size, bp, zio->io_ndvas, 134467bd71c6Sperrin zio->io_txg, NULL, B_FALSE); 1345fa9e4066Sahrens 1346fa9e4066Sahrens if (error == 0) { 1347fa9e4066Sahrens bp->blk_birth = zio->io_txg; 1348fa9e4066Sahrens } else if (error == ENOSPC) { 1349fa9e4066Sahrens if (zio->io_size == SPA_MINBLOCKSIZE) 1350fa9e4066Sahrens panic("really, truly out of space"); 1351fa9e4066Sahrens zio_write_allocate_gang_members(zio); 1352fa9e4066Sahrens return; 1353fa9e4066Sahrens } else { 1354fa9e4066Sahrens zio->io_error = error; 1355fa9e4066Sahrens } 1356fa9e4066Sahrens zio_next_stage(zio); 1357fa9e4066Sahrens } 1358fa9e4066Sahrens 1359fa9e4066Sahrens static void 1360fa9e4066Sahrens zio_dva_free(zio_t *zio) 1361fa9e4066Sahrens { 1362fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 1363fa9e4066Sahrens 1364d80c45e0Sbonwick metaslab_free(zio->io_spa, bp, zio->io_txg, B_FALSE); 1365fa9e4066Sahrens 1366fa9e4066Sahrens BP_ZERO(bp); 1367fa9e4066Sahrens 1368fa9e4066Sahrens zio_next_stage(zio); 1369fa9e4066Sahrens } 1370fa9e4066Sahrens 1371fa9e4066Sahrens static void 1372fa9e4066Sahrens zio_dva_claim(zio_t *zio) 1373fa9e4066Sahrens { 1374d80c45e0Sbonwick zio->io_error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); 1375fa9e4066Sahrens 1376fa9e4066Sahrens zio_next_stage(zio); 1377fa9e4066Sahrens } 1378fa9e4066Sahrens 1379fa9e4066Sahrens /* 1380fa9e4066Sahrens * ========================================================================== 1381fa9e4066Sahrens * Read and write to physical devices 1382fa9e4066Sahrens * ========================================================================== 1383fa9e4066Sahrens */ 1384fa9e4066Sahrens 1385fa9e4066Sahrens static void 138644cd46caSbillm zio_vdev_io_start(zio_t *zio) 1387fa9e4066Sahrens { 1388fa9e4066Sahrens vdev_t *vd = zio->io_vd; 138944cd46caSbillm vdev_t *tvd = vd ? vd->vdev_top : NULL; 139044cd46caSbillm blkptr_t *bp = zio->io_bp; 139144cd46caSbillm uint64_t align; 139244cd46caSbillm 139344cd46caSbillm if (vd == NULL) { 139444cd46caSbillm /* The mirror_ops handle multiple DVAs in a single BP */ 139544cd46caSbillm vdev_mirror_ops.vdev_op_io_start(zio); 139644cd46caSbillm return; 139744cd46caSbillm } 139844cd46caSbillm 139944cd46caSbillm align = 1ULL << tvd->vdev_ashift; 1400fa9e4066Sahrens 1401ecc2d604Sbonwick if (zio->io_retries == 0 && vd == tvd) 1402fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_FAILFAST; 1403fa9e4066Sahrens 140444cd46caSbillm if (!(zio->io_flags & ZIO_FLAG_PHYSICAL) && 140544cd46caSbillm vd->vdev_children == 0) { 1406fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_PHYSICAL; 1407fa9e4066Sahrens zio->io_offset += VDEV_LABEL_START_SIZE; 1408fa9e4066Sahrens } 1409fa9e4066Sahrens 1410ecc2d604Sbonwick if (P2PHASE(zio->io_size, align) != 0) { 1411ecc2d604Sbonwick uint64_t asize = P2ROUNDUP(zio->io_size, align); 1412ecc2d604Sbonwick char *abuf = zio_buf_alloc(asize); 1413ecc2d604Sbonwick ASSERT(vd == tvd); 1414ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_WRITE) { 1415ecc2d604Sbonwick bcopy(zio->io_data, abuf, zio->io_size); 1416ecc2d604Sbonwick bzero(abuf + zio->io_size, asize - zio->io_size); 1417ecc2d604Sbonwick } 1418ecc2d604Sbonwick zio_push_transform(zio, abuf, asize, asize); 1419ecc2d604Sbonwick ASSERT(!(zio->io_flags & ZIO_FLAG_SUBBLOCK)); 1420ecc2d604Sbonwick zio->io_flags |= ZIO_FLAG_SUBBLOCK; 1421ecc2d604Sbonwick } 1422ecc2d604Sbonwick 1423ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_offset, align) == 0); 1424ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_size, align) == 0); 1425ecc2d604Sbonwick ASSERT(bp == NULL || 1426ecc2d604Sbonwick P2ROUNDUP(ZIO_GET_IOSIZE(zio), align) == zio->io_size); 1427fa9e4066Sahrens ASSERT(zio->io_type != ZIO_TYPE_WRITE || (spa_mode & FWRITE)); 1428fa9e4066Sahrens 1429fa9e4066Sahrens vdev_io_start(zio); 1430fa9e4066Sahrens 1431fa9e4066Sahrens /* zio_next_stage_async() gets called from io completion interrupt */ 1432fa9e4066Sahrens } 1433fa9e4066Sahrens 1434fa9e4066Sahrens static void 1435fa9e4066Sahrens zio_vdev_io_done(zio_t *zio) 1436fa9e4066Sahrens { 143744cd46caSbillm if (zio->io_vd == NULL) 143844cd46caSbillm /* The mirror_ops handle multiple DVAs in a single BP */ 143944cd46caSbillm vdev_mirror_ops.vdev_op_io_done(zio); 144044cd46caSbillm else 144144cd46caSbillm vdev_io_done(zio); 1442fa9e4066Sahrens } 1443fa9e4066Sahrens 1444fa9e4066Sahrens /* XXPOLICY */ 1445ea8dc4b6Seschrock boolean_t 1446fa9e4066Sahrens zio_should_retry(zio_t *zio) 1447fa9e4066Sahrens { 1448fa9e4066Sahrens vdev_t *vd = zio->io_vd; 1449fa9e4066Sahrens 1450fa9e4066Sahrens if (zio->io_error == 0) 1451fa9e4066Sahrens return (B_FALSE); 1452fa9e4066Sahrens if (zio->io_delegate_list != NULL) 1453fa9e4066Sahrens return (B_FALSE); 145444cd46caSbillm if (vd && vd != vd->vdev_top) 1455fa9e4066Sahrens return (B_FALSE); 1456fa9e4066Sahrens if (zio->io_flags & ZIO_FLAG_DONT_RETRY) 1457fa9e4066Sahrens return (B_FALSE); 1458ea8dc4b6Seschrock if (zio->io_retries > 0) 1459fa9e4066Sahrens return (B_FALSE); 1460fa9e4066Sahrens 1461fa9e4066Sahrens return (B_TRUE); 1462fa9e4066Sahrens } 1463fa9e4066Sahrens 1464fa9e4066Sahrens static void 1465fa9e4066Sahrens zio_vdev_io_assess(zio_t *zio) 1466fa9e4066Sahrens { 1467fa9e4066Sahrens vdev_t *vd = zio->io_vd; 146844cd46caSbillm vdev_t *tvd = vd ? vd->vdev_top : NULL; 1469fa9e4066Sahrens 1470fa9e4066Sahrens ASSERT(zio->io_vsd == NULL); 1471fa9e4066Sahrens 1472ecc2d604Sbonwick if (zio->io_flags & ZIO_FLAG_SUBBLOCK) { 1473ecc2d604Sbonwick void *abuf; 1474ecc2d604Sbonwick uint64_t asize; 1475ecc2d604Sbonwick ASSERT(vd == tvd); 1476ecc2d604Sbonwick zio_pop_transform(zio, &abuf, &asize, &asize); 1477ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_READ) 1478ecc2d604Sbonwick bcopy(abuf, zio->io_data, zio->io_size); 1479ecc2d604Sbonwick zio_buf_free(abuf, asize); 1480ecc2d604Sbonwick zio->io_flags &= ~ZIO_FLAG_SUBBLOCK; 1481ecc2d604Sbonwick } 1482ecc2d604Sbonwick 1483ea8dc4b6Seschrock if (zio_injection_enabled && !zio->io_error) 1484ea8dc4b6Seschrock zio->io_error = zio_handle_fault_injection(zio, EIO); 1485ea8dc4b6Seschrock 1486fa9e4066Sahrens /* 1487fa9e4066Sahrens * If the I/O failed, determine whether we should attempt to retry it. 1488fa9e4066Sahrens */ 1489fa9e4066Sahrens /* XXPOLICY */ 1490fa9e4066Sahrens if (zio_should_retry(zio)) { 1491fa9e4066Sahrens ASSERT(tvd == vd); 1492fa9e4066Sahrens 1493fa9e4066Sahrens zio->io_retries++; 1494fa9e4066Sahrens zio->io_error = 0; 1495*b3995adbSahrens zio->io_flags &= ZIO_FLAG_VDEV_INHERIT | 1496*b3995adbSahrens ZIO_FLAG_CONFIG_GRABBED; 1497fa9e4066Sahrens /* XXPOLICY */ 1498fa9e4066Sahrens zio->io_flags &= ~ZIO_FLAG_FAILFAST; 1499fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_DONT_CACHE; 150044cd46caSbillm zio->io_stage = ZIO_STAGE_VDEV_IO_START - 1; 1501fa9e4066Sahrens 1502fa9e4066Sahrens dprintf("retry #%d for %s to %s offset %llx\n", 1503fa9e4066Sahrens zio->io_retries, zio_type_name[zio->io_type], 1504fa9e4066Sahrens vdev_description(vd), zio->io_offset); 1505fa9e4066Sahrens 1506ea8dc4b6Seschrock zio_next_stage_async(zio); 1507ea8dc4b6Seschrock return; 1508ea8dc4b6Seschrock } 1509fa9e4066Sahrens 151044cd46caSbillm if (zio->io_error != 0 && zio->io_error != ECKSUM && 151144cd46caSbillm !(zio->io_flags & ZIO_FLAG_SPECULATIVE) && vd) { 1512fa9e4066Sahrens /* 1513ea8dc4b6Seschrock * Poor man's hotplug support. Even if we're done retrying this 1514ea8dc4b6Seschrock * I/O, try to reopen the vdev to see if it's still attached. 1515ea8dc4b6Seschrock * To avoid excessive thrashing, we only try it once a minute. 1516ea8dc4b6Seschrock * This also has the effect of detecting when missing devices 1517ea8dc4b6Seschrock * have come back, by polling the device once a minute. 1518ea8dc4b6Seschrock * 1519ea8dc4b6Seschrock * We need to do this asynchronously because we can't grab 1520ea8dc4b6Seschrock * all the necessary locks way down here. 1521fa9e4066Sahrens */ 1522ea8dc4b6Seschrock if (gethrtime() - vd->vdev_last_try > 60ULL * NANOSEC) { 1523ea8dc4b6Seschrock vd->vdev_last_try = gethrtime(); 1524ea8dc4b6Seschrock tvd->vdev_reopen_wanted = 1; 1525ea8dc4b6Seschrock spa_async_request(vd->vdev_spa, SPA_ASYNC_REOPEN); 1526ea8dc4b6Seschrock } 1527fa9e4066Sahrens } 1528fa9e4066Sahrens 1529fa9e4066Sahrens zio_next_stage(zio); 1530fa9e4066Sahrens } 1531fa9e4066Sahrens 1532fa9e4066Sahrens void 1533fa9e4066Sahrens zio_vdev_io_reissue(zio_t *zio) 1534fa9e4066Sahrens { 1535fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 1536fa9e4066Sahrens ASSERT(zio->io_error == 0); 1537fa9e4066Sahrens 1538fa9e4066Sahrens zio->io_stage--; 1539fa9e4066Sahrens } 1540fa9e4066Sahrens 1541fa9e4066Sahrens void 1542fa9e4066Sahrens zio_vdev_io_redone(zio_t *zio) 1543fa9e4066Sahrens { 1544fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); 1545fa9e4066Sahrens 1546fa9e4066Sahrens zio->io_stage--; 1547fa9e4066Sahrens } 1548fa9e4066Sahrens 1549fa9e4066Sahrens void 1550fa9e4066Sahrens zio_vdev_io_bypass(zio_t *zio) 1551fa9e4066Sahrens { 1552fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 1553fa9e4066Sahrens ASSERT(zio->io_error == 0); 1554fa9e4066Sahrens 1555fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_IO_BYPASS; 1556fa9e4066Sahrens zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS - 1; 1557fa9e4066Sahrens } 1558fa9e4066Sahrens 1559fa9e4066Sahrens /* 1560fa9e4066Sahrens * ========================================================================== 1561fa9e4066Sahrens * Generate and verify checksums 1562fa9e4066Sahrens * ========================================================================== 1563fa9e4066Sahrens */ 1564fa9e4066Sahrens static void 1565fa9e4066Sahrens zio_checksum_generate(zio_t *zio) 1566fa9e4066Sahrens { 1567fa9e4066Sahrens int checksum = zio->io_checksum; 1568fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 1569fa9e4066Sahrens 1570fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 1571fa9e4066Sahrens 1572fa9e4066Sahrens BP_SET_CHECKSUM(bp, checksum); 1573fa9e4066Sahrens BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 1574fa9e4066Sahrens 1575fa9e4066Sahrens zio_checksum(checksum, &bp->blk_cksum, zio->io_data, zio->io_size); 1576fa9e4066Sahrens 1577fa9e4066Sahrens zio_next_stage(zio); 1578fa9e4066Sahrens } 1579fa9e4066Sahrens 1580fa9e4066Sahrens static void 1581fa9e4066Sahrens zio_gang_checksum_generate(zio_t *zio) 1582fa9e4066Sahrens { 1583fa9e4066Sahrens zio_cksum_t zc; 1584fa9e4066Sahrens zio_gbh_phys_t *gbh = zio->io_data; 1585fa9e4066Sahrens 158644cd46caSbillm ASSERT(BP_IS_GANG(zio->io_bp)); 1587fa9e4066Sahrens ASSERT3U(zio->io_size, ==, SPA_GANGBLOCKSIZE); 1588fa9e4066Sahrens 1589fa9e4066Sahrens zio_set_gang_verifier(zio, &gbh->zg_tail.zbt_cksum); 1590fa9e4066Sahrens 1591fa9e4066Sahrens zio_checksum(ZIO_CHECKSUM_GANG_HEADER, &zc, zio->io_data, zio->io_size); 1592fa9e4066Sahrens 1593fa9e4066Sahrens zio_next_stage(zio); 1594fa9e4066Sahrens } 1595fa9e4066Sahrens 1596fa9e4066Sahrens static void 1597fa9e4066Sahrens zio_checksum_verify(zio_t *zio) 1598fa9e4066Sahrens { 1599fa9e4066Sahrens if (zio->io_bp != NULL) { 1600fa9e4066Sahrens zio->io_error = zio_checksum_error(zio); 1601ea8dc4b6Seschrock if (zio->io_error && !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) 1602ea8dc4b6Seschrock zfs_ereport_post(FM_EREPORT_ZFS_CHECKSUM, 1603ea8dc4b6Seschrock zio->io_spa, zio->io_vd, zio, 0, 0); 1604fa9e4066Sahrens } 1605fa9e4066Sahrens 1606fa9e4066Sahrens zio_next_stage(zio); 1607fa9e4066Sahrens } 1608fa9e4066Sahrens 1609fa9e4066Sahrens /* 1610fa9e4066Sahrens * Called by RAID-Z to ensure we don't compute the checksum twice. 1611fa9e4066Sahrens */ 1612fa9e4066Sahrens void 1613fa9e4066Sahrens zio_checksum_verified(zio_t *zio) 1614fa9e4066Sahrens { 1615fa9e4066Sahrens zio->io_pipeline &= ~(1U << ZIO_STAGE_CHECKSUM_VERIFY); 1616fa9e4066Sahrens } 1617fa9e4066Sahrens 1618fa9e4066Sahrens /* 1619fa9e4066Sahrens * Set the external verifier for a gang block based on stuff in the bp 1620fa9e4066Sahrens */ 1621fa9e4066Sahrens void 1622fa9e4066Sahrens zio_set_gang_verifier(zio_t *zio, zio_cksum_t *zcp) 1623fa9e4066Sahrens { 162444cd46caSbillm blkptr_t *bp = zio->io_bp; 162544cd46caSbillm 162644cd46caSbillm zcp->zc_word[0] = DVA_GET_VDEV(BP_IDENTITY(bp)); 162744cd46caSbillm zcp->zc_word[1] = DVA_GET_OFFSET(BP_IDENTITY(bp)); 162844cd46caSbillm zcp->zc_word[2] = bp->blk_birth; 1629fa9e4066Sahrens zcp->zc_word[3] = 0; 1630fa9e4066Sahrens } 1631fa9e4066Sahrens 1632fa9e4066Sahrens /* 1633fa9e4066Sahrens * ========================================================================== 1634fa9e4066Sahrens * Define the pipeline 1635fa9e4066Sahrens * ========================================================================== 1636fa9e4066Sahrens */ 1637fa9e4066Sahrens typedef void zio_pipe_stage_t(zio_t *zio); 1638fa9e4066Sahrens 1639fa9e4066Sahrens static void 1640fa9e4066Sahrens zio_badop(zio_t *zio) 1641fa9e4066Sahrens { 1642fa9e4066Sahrens panic("Invalid I/O pipeline stage %u for zio %p", zio->io_stage, zio); 1643fa9e4066Sahrens } 1644fa9e4066Sahrens 1645fa9e4066Sahrens zio_pipe_stage_t *zio_pipeline[ZIO_STAGE_DONE + 2] = { 1646fa9e4066Sahrens zio_badop, 1647fa9e4066Sahrens zio_wait_children_ready, 1648fa9e4066Sahrens zio_write_compress, 1649fa9e4066Sahrens zio_checksum_generate, 1650fa9e4066Sahrens zio_gang_pipeline, 1651fa9e4066Sahrens zio_get_gang_header, 1652fa9e4066Sahrens zio_rewrite_gang_members, 1653fa9e4066Sahrens zio_free_gang_members, 1654fa9e4066Sahrens zio_claim_gang_members, 1655fa9e4066Sahrens zio_dva_allocate, 1656fa9e4066Sahrens zio_dva_free, 1657fa9e4066Sahrens zio_dva_claim, 1658fa9e4066Sahrens zio_gang_checksum_generate, 1659fa9e4066Sahrens zio_ready, 1660fa9e4066Sahrens zio_vdev_io_start, 1661fa9e4066Sahrens zio_vdev_io_done, 1662fa9e4066Sahrens zio_vdev_io_assess, 1663fa9e4066Sahrens zio_wait_children_done, 1664fa9e4066Sahrens zio_checksum_verify, 1665fa9e4066Sahrens zio_read_gang_members, 1666fa9e4066Sahrens zio_read_decompress, 1667fa9e4066Sahrens zio_done, 1668fa9e4066Sahrens zio_badop 1669fa9e4066Sahrens }; 1670fa9e4066Sahrens 1671fa9e4066Sahrens /* 1672fa9e4066Sahrens * Move an I/O to the next stage of the pipeline and execute that stage. 1673fa9e4066Sahrens * There's no locking on io_stage because there's no legitimate way for 1674fa9e4066Sahrens * multiple threads to be attempting to process the same I/O. 1675fa9e4066Sahrens */ 1676fa9e4066Sahrens void 1677fa9e4066Sahrens zio_next_stage(zio_t *zio) 1678fa9e4066Sahrens { 1679fa9e4066Sahrens uint32_t pipeline = zio->io_pipeline; 1680fa9e4066Sahrens 1681fa9e4066Sahrens ASSERT(!MUTEX_HELD(&zio->io_lock)); 1682fa9e4066Sahrens 1683fa9e4066Sahrens if (zio->io_error) { 1684fa9e4066Sahrens dprintf("zio %p vdev %s offset %llx stage %d error %d\n", 1685fa9e4066Sahrens zio, vdev_description(zio->io_vd), 1686fa9e4066Sahrens zio->io_offset, zio->io_stage, zio->io_error); 1687fa9e4066Sahrens if (((1U << zio->io_stage) & ZIO_VDEV_IO_PIPELINE) == 0) 1688fa9e4066Sahrens pipeline &= ZIO_ERROR_PIPELINE_MASK; 1689fa9e4066Sahrens } 1690fa9e4066Sahrens 1691fa9e4066Sahrens while (((1U << ++zio->io_stage) & pipeline) == 0) 1692fa9e4066Sahrens continue; 1693fa9e4066Sahrens 1694fa9e4066Sahrens ASSERT(zio->io_stage <= ZIO_STAGE_DONE); 1695fa9e4066Sahrens ASSERT(zio->io_stalled == 0); 1696fa9e4066Sahrens 1697fa9e4066Sahrens zio_pipeline[zio->io_stage](zio); 1698fa9e4066Sahrens } 1699fa9e4066Sahrens 1700fa9e4066Sahrens void 1701fa9e4066Sahrens zio_next_stage_async(zio_t *zio) 1702fa9e4066Sahrens { 1703fa9e4066Sahrens taskq_t *tq; 1704fa9e4066Sahrens uint32_t pipeline = zio->io_pipeline; 1705fa9e4066Sahrens 1706fa9e4066Sahrens ASSERT(!MUTEX_HELD(&zio->io_lock)); 1707fa9e4066Sahrens 1708fa9e4066Sahrens if (zio->io_error) { 1709fa9e4066Sahrens dprintf("zio %p vdev %s offset %llx stage %d error %d\n", 1710fa9e4066Sahrens zio, vdev_description(zio->io_vd), 1711fa9e4066Sahrens zio->io_offset, zio->io_stage, zio->io_error); 1712fa9e4066Sahrens if (((1U << zio->io_stage) & ZIO_VDEV_IO_PIPELINE) == 0) 1713fa9e4066Sahrens pipeline &= ZIO_ERROR_PIPELINE_MASK; 1714fa9e4066Sahrens } 1715fa9e4066Sahrens 1716fa9e4066Sahrens while (((1U << ++zio->io_stage) & pipeline) == 0) 1717fa9e4066Sahrens continue; 1718fa9e4066Sahrens 1719fa9e4066Sahrens ASSERT(zio->io_stage <= ZIO_STAGE_DONE); 1720fa9e4066Sahrens ASSERT(zio->io_stalled == 0); 1721fa9e4066Sahrens 1722fa9e4066Sahrens /* 1723fa9e4066Sahrens * For performance, we'll probably want two sets of task queues: 1724fa9e4066Sahrens * per-CPU issue taskqs and per-CPU completion taskqs. The per-CPU 1725fa9e4066Sahrens * part is for read performance: since we have to make a pass over 1726fa9e4066Sahrens * the data to checksum it anyway, we want to do this on the same CPU 1727fa9e4066Sahrens * that issued the read, because (assuming CPU scheduling affinity) 1728fa9e4066Sahrens * that thread is probably still there. Getting this optimization 1729fa9e4066Sahrens * right avoids performance-hostile cache-to-cache transfers. 1730fa9e4066Sahrens * 1731fa9e4066Sahrens * Note that having two sets of task queues is also necessary for 1732fa9e4066Sahrens * correctness: if all of the issue threads get bogged down waiting 1733fa9e4066Sahrens * for dependent reads (e.g. metaslab freelist) to complete, then 1734fa9e4066Sahrens * there won't be any threads available to service I/O completion 1735fa9e4066Sahrens * interrupts. 1736fa9e4066Sahrens */ 1737fa9e4066Sahrens if ((1U << zio->io_stage) & zio->io_async_stages) { 1738fa9e4066Sahrens if (zio->io_stage < ZIO_STAGE_VDEV_IO_DONE) 1739fa9e4066Sahrens tq = zio->io_spa->spa_zio_issue_taskq[zio->io_type]; 1740fa9e4066Sahrens else 1741fa9e4066Sahrens tq = zio->io_spa->spa_zio_intr_taskq[zio->io_type]; 1742fa9e4066Sahrens (void) taskq_dispatch(tq, 1743fa9e4066Sahrens (task_func_t *)zio_pipeline[zio->io_stage], zio, TQ_SLEEP); 1744fa9e4066Sahrens } else { 1745fa9e4066Sahrens zio_pipeline[zio->io_stage](zio); 1746fa9e4066Sahrens } 1747fa9e4066Sahrens } 1748fa9e4066Sahrens 1749fa9e4066Sahrens /* 1750fa9e4066Sahrens * Try to allocate an intent log block. Return 0 on success, errno on failure. 1751fa9e4066Sahrens */ 1752fa9e4066Sahrens int 175367bd71c6Sperrin zio_alloc_blk(spa_t *spa, uint64_t size, blkptr_t *new_bp, blkptr_t *old_bp, 175467bd71c6Sperrin uint64_t txg) 1755fa9e4066Sahrens { 1756fa9e4066Sahrens int error; 1757fa9e4066Sahrens 1758ea8dc4b6Seschrock spa_config_enter(spa, RW_READER, FTAG); 1759fa9e4066Sahrens 176067bd71c6Sperrin /* 176167bd71c6Sperrin * We were passed the previous log blocks dva_t in bp->blk_dva[0]. 176267bd71c6Sperrin */ 176367bd71c6Sperrin error = metaslab_alloc(spa, size, new_bp, 1, txg, old_bp, B_TRUE); 1764fa9e4066Sahrens 1765fa9e4066Sahrens if (error == 0) { 176667bd71c6Sperrin BP_SET_LSIZE(new_bp, size); 176767bd71c6Sperrin BP_SET_PSIZE(new_bp, size); 176867bd71c6Sperrin BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); 176967bd71c6Sperrin BP_SET_CHECKSUM(new_bp, ZIO_CHECKSUM_ZILOG); 177067bd71c6Sperrin BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 177167bd71c6Sperrin BP_SET_LEVEL(new_bp, 0); 177267bd71c6Sperrin BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); 177367bd71c6Sperrin new_bp->blk_birth = txg; 1774fa9e4066Sahrens } 1775fa9e4066Sahrens 1776ea8dc4b6Seschrock spa_config_exit(spa, FTAG); 1777fa9e4066Sahrens 1778fa9e4066Sahrens return (error); 1779fa9e4066Sahrens } 1780fa9e4066Sahrens 1781fa9e4066Sahrens /* 1782fa9e4066Sahrens * Free an intent log block. We know it can't be a gang block, so there's 1783fa9e4066Sahrens * nothing to do except metaslab_free() it. 1784fa9e4066Sahrens */ 1785fa9e4066Sahrens void 1786fa9e4066Sahrens zio_free_blk(spa_t *spa, blkptr_t *bp, uint64_t txg) 1787fa9e4066Sahrens { 178844cd46caSbillm ASSERT(!BP_IS_GANG(bp)); 1789fa9e4066Sahrens 1790ea8dc4b6Seschrock spa_config_enter(spa, RW_READER, FTAG); 1791fa9e4066Sahrens 1792d80c45e0Sbonwick metaslab_free(spa, bp, txg, B_FALSE); 1793fa9e4066Sahrens 1794ea8dc4b6Seschrock spa_config_exit(spa, FTAG); 1795fa9e4066Sahrens } 1796