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 /* 221ab7f2deSmaybee * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #include <sys/zfs_context.h> 27ea8dc4b6Seschrock #include <sys/fm/fs/zfs.h> 28fa9e4066Sahrens #include <sys/spa.h> 29fa9e4066Sahrens #include <sys/txg.h> 30fa9e4066Sahrens #include <sys/spa_impl.h> 31fa9e4066Sahrens #include <sys/vdev_impl.h> 32fa9e4066Sahrens #include <sys/zio_impl.h> 33fa9e4066Sahrens #include <sys/zio_compress.h> 34fa9e4066Sahrens #include <sys/zio_checksum.h> 35fa9e4066Sahrens 36fa9e4066Sahrens /* 37fa9e4066Sahrens * ========================================================================== 38fa9e4066Sahrens * I/O priority table 39fa9e4066Sahrens * ========================================================================== 40fa9e4066Sahrens */ 41fa9e4066Sahrens uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE] = { 42fa9e4066Sahrens 0, /* ZIO_PRIORITY_NOW */ 43fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_READ */ 44fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_WRITE */ 45fa9e4066Sahrens 6, /* ZIO_PRIORITY_ASYNC_READ */ 46fa9e4066Sahrens 4, /* ZIO_PRIORITY_ASYNC_WRITE */ 47fa9e4066Sahrens 4, /* ZIO_PRIORITY_FREE */ 48fa9e4066Sahrens 0, /* ZIO_PRIORITY_CACHE_FILL */ 49fa9e4066Sahrens 0, /* ZIO_PRIORITY_LOG_WRITE */ 50fa9e4066Sahrens 10, /* ZIO_PRIORITY_RESILVER */ 51fa9e4066Sahrens 20, /* ZIO_PRIORITY_SCRUB */ 52fa9e4066Sahrens }; 53fa9e4066Sahrens 54fa9e4066Sahrens /* 55fa9e4066Sahrens * ========================================================================== 56fa9e4066Sahrens * I/O type descriptions 57fa9e4066Sahrens * ========================================================================== 58fa9e4066Sahrens */ 59fa9e4066Sahrens char *zio_type_name[ZIO_TYPES] = { 60fa9e4066Sahrens "null", "read", "write", "free", "claim", "ioctl" }; 61fa9e4066Sahrens 62e14bb325SJeff Bonwick #define SYNC_PASS_DEFERRED_FREE 1 /* defer frees after this pass */ 63e14bb325SJeff Bonwick #define SYNC_PASS_DONT_COMPRESS 4 /* don't compress after this pass */ 64e14bb325SJeff Bonwick #define SYNC_PASS_REWRITE 1 /* rewrite new bps after this pass */ 650a4e9518Sgw 66fa9e4066Sahrens /* 67fa9e4066Sahrens * ========================================================================== 68fa9e4066Sahrens * I/O kmem caches 69fa9e4066Sahrens * ========================================================================== 70fa9e4066Sahrens */ 71ccae0b50Seschrock kmem_cache_t *zio_cache; 72fa9e4066Sahrens kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 73ad23a2dbSjohansen kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 74ad23a2dbSjohansen 75ad23a2dbSjohansen #ifdef _KERNEL 76ad23a2dbSjohansen extern vmem_t *zio_alloc_arena; 77ad23a2dbSjohansen #endif 78fa9e4066Sahrens 790a4e9518Sgw /* 80e14bb325SJeff Bonwick * An allocating zio is one that either currently has the DVA allocate 81e14bb325SJeff Bonwick * stage set or will have it later in its lifetime. 820a4e9518Sgw */ 830a4e9518Sgw #define IO_IS_ALLOCATING(zio) \ 8417f17c2dSbonwick ((zio)->io_orig_pipeline & (1U << ZIO_STAGE_DVA_ALLOCATE)) 850a4e9518Sgw 86fa9e4066Sahrens void 87fa9e4066Sahrens zio_init(void) 88fa9e4066Sahrens { 89fa9e4066Sahrens size_t c; 90ad23a2dbSjohansen vmem_t *data_alloc_arena = NULL; 91ad23a2dbSjohansen 92ad23a2dbSjohansen #ifdef _KERNEL 93ad23a2dbSjohansen data_alloc_arena = zio_alloc_arena; 94ad23a2dbSjohansen #endif 95ccae0b50Seschrock zio_cache = kmem_cache_create("zio_cache", sizeof (zio_t), 0, 96ccae0b50Seschrock NULL, NULL, NULL, NULL, NULL, 0); 97ccae0b50Seschrock 98fa9e4066Sahrens /* 99fa9e4066Sahrens * For small buffers, we want a cache for each multiple of 100fa9e4066Sahrens * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache 101fa9e4066Sahrens * for each quarter-power of 2. For large buffers, we want 102fa9e4066Sahrens * a cache for each multiple of PAGESIZE. 103fa9e4066Sahrens */ 104fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 105fa9e4066Sahrens size_t size = (c + 1) << SPA_MINBLOCKSHIFT; 106fa9e4066Sahrens size_t p2 = size; 107fa9e4066Sahrens size_t align = 0; 108fa9e4066Sahrens 109fa9e4066Sahrens while (p2 & (p2 - 1)) 110fa9e4066Sahrens p2 &= p2 - 1; 111fa9e4066Sahrens 112fa9e4066Sahrens if (size <= 4 * SPA_MINBLOCKSIZE) { 113fa9e4066Sahrens align = SPA_MINBLOCKSIZE; 114fa9e4066Sahrens } else if (P2PHASE(size, PAGESIZE) == 0) { 115fa9e4066Sahrens align = PAGESIZE; 116fa9e4066Sahrens } else if (P2PHASE(size, p2 >> 2) == 0) { 117fa9e4066Sahrens align = p2 >> 2; 118fa9e4066Sahrens } 119fa9e4066Sahrens 120fa9e4066Sahrens if (align != 0) { 121ad23a2dbSjohansen char name[36]; 1225ad82045Snd (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); 123fa9e4066Sahrens zio_buf_cache[c] = kmem_cache_create(name, size, 124a0965f35Sbonwick align, NULL, NULL, NULL, NULL, NULL, KMC_NODEBUG); 125ad23a2dbSjohansen 126ad23a2dbSjohansen (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); 127ad23a2dbSjohansen zio_data_buf_cache[c] = kmem_cache_create(name, size, 128ad23a2dbSjohansen align, NULL, NULL, NULL, NULL, data_alloc_arena, 129ad23a2dbSjohansen KMC_NODEBUG); 130fa9e4066Sahrens } 131fa9e4066Sahrens } 132fa9e4066Sahrens 133fa9e4066Sahrens while (--c != 0) { 134fa9e4066Sahrens ASSERT(zio_buf_cache[c] != NULL); 135fa9e4066Sahrens if (zio_buf_cache[c - 1] == NULL) 136fa9e4066Sahrens zio_buf_cache[c - 1] = zio_buf_cache[c]; 137ad23a2dbSjohansen 138ad23a2dbSjohansen ASSERT(zio_data_buf_cache[c] != NULL); 139ad23a2dbSjohansen if (zio_data_buf_cache[c - 1] == NULL) 140ad23a2dbSjohansen zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; 141fa9e4066Sahrens } 142ea8dc4b6Seschrock 143ea8dc4b6Seschrock zio_inject_init(); 144fa9e4066Sahrens } 145fa9e4066Sahrens 146fa9e4066Sahrens void 147fa9e4066Sahrens zio_fini(void) 148fa9e4066Sahrens { 149fa9e4066Sahrens size_t c; 150fa9e4066Sahrens kmem_cache_t *last_cache = NULL; 151ad23a2dbSjohansen kmem_cache_t *last_data_cache = NULL; 152fa9e4066Sahrens 153fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 154fa9e4066Sahrens if (zio_buf_cache[c] != last_cache) { 155fa9e4066Sahrens last_cache = zio_buf_cache[c]; 156fa9e4066Sahrens kmem_cache_destroy(zio_buf_cache[c]); 157fa9e4066Sahrens } 158fa9e4066Sahrens zio_buf_cache[c] = NULL; 159ad23a2dbSjohansen 160ad23a2dbSjohansen if (zio_data_buf_cache[c] != last_data_cache) { 161ad23a2dbSjohansen last_data_cache = zio_data_buf_cache[c]; 162ad23a2dbSjohansen kmem_cache_destroy(zio_data_buf_cache[c]); 163ad23a2dbSjohansen } 164ad23a2dbSjohansen zio_data_buf_cache[c] = NULL; 165fa9e4066Sahrens } 166ea8dc4b6Seschrock 167ccae0b50Seschrock kmem_cache_destroy(zio_cache); 168ccae0b50Seschrock 169ea8dc4b6Seschrock zio_inject_fini(); 170fa9e4066Sahrens } 171fa9e4066Sahrens 172fa9e4066Sahrens /* 173fa9e4066Sahrens * ========================================================================== 174fa9e4066Sahrens * Allocate and free I/O buffers 175fa9e4066Sahrens * ========================================================================== 176fa9e4066Sahrens */ 177ad23a2dbSjohansen 178ad23a2dbSjohansen /* 179ad23a2dbSjohansen * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a 180ad23a2dbSjohansen * crashdump if the kernel panics, so use it judiciously. Obviously, it's 181ad23a2dbSjohansen * useful to inspect ZFS metadata, but if possible, we should avoid keeping 182ad23a2dbSjohansen * excess / transient data in-core during a crashdump. 183ad23a2dbSjohansen */ 184fa9e4066Sahrens void * 185fa9e4066Sahrens zio_buf_alloc(size_t size) 186fa9e4066Sahrens { 187fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 188fa9e4066Sahrens 189fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 190fa9e4066Sahrens 1911ab7f2deSmaybee return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); 192fa9e4066Sahrens } 193fa9e4066Sahrens 194ad23a2dbSjohansen /* 195ad23a2dbSjohansen * Use zio_data_buf_alloc to allocate data. The data will not appear in a 196ad23a2dbSjohansen * crashdump if the kernel panics. This exists so that we will limit the amount 197ad23a2dbSjohansen * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount 198ad23a2dbSjohansen * of kernel heap dumped to disk when the kernel panics) 199ad23a2dbSjohansen */ 200ad23a2dbSjohansen void * 201ad23a2dbSjohansen zio_data_buf_alloc(size_t size) 202ad23a2dbSjohansen { 203ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 204ad23a2dbSjohansen 205ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 206ad23a2dbSjohansen 2071ab7f2deSmaybee return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); 208ad23a2dbSjohansen } 209ad23a2dbSjohansen 210fa9e4066Sahrens void 211fa9e4066Sahrens zio_buf_free(void *buf, size_t size) 212fa9e4066Sahrens { 213fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 214fa9e4066Sahrens 215fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 216fa9e4066Sahrens 217fa9e4066Sahrens kmem_cache_free(zio_buf_cache[c], buf); 218fa9e4066Sahrens } 219fa9e4066Sahrens 220ad23a2dbSjohansen void 221ad23a2dbSjohansen zio_data_buf_free(void *buf, size_t size) 222ad23a2dbSjohansen { 223ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 224ad23a2dbSjohansen 225ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 226ad23a2dbSjohansen 227ad23a2dbSjohansen kmem_cache_free(zio_data_buf_cache[c], buf); 228ad23a2dbSjohansen } 229b3995adbSahrens 230fa9e4066Sahrens /* 231fa9e4066Sahrens * ========================================================================== 232fa9e4066Sahrens * Push and pop I/O transform buffers 233fa9e4066Sahrens * ========================================================================== 234fa9e4066Sahrens */ 235fa9e4066Sahrens static void 236e14bb325SJeff Bonwick zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, 237e14bb325SJeff Bonwick zio_transform_func_t *transform) 238fa9e4066Sahrens { 239fa9e4066Sahrens zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); 240fa9e4066Sahrens 241e14bb325SJeff Bonwick zt->zt_orig_data = zio->io_data; 242e14bb325SJeff Bonwick zt->zt_orig_size = zio->io_size; 243fa9e4066Sahrens zt->zt_bufsize = bufsize; 244e14bb325SJeff Bonwick zt->zt_transform = transform; 245fa9e4066Sahrens 246fa9e4066Sahrens zt->zt_next = zio->io_transform_stack; 247fa9e4066Sahrens zio->io_transform_stack = zt; 248fa9e4066Sahrens 249fa9e4066Sahrens zio->io_data = data; 250fa9e4066Sahrens zio->io_size = size; 251fa9e4066Sahrens } 252fa9e4066Sahrens 253fa9e4066Sahrens static void 254e14bb325SJeff Bonwick zio_pop_transforms(zio_t *zio) 255fa9e4066Sahrens { 256e14bb325SJeff Bonwick zio_transform_t *zt; 257e14bb325SJeff Bonwick 258e14bb325SJeff Bonwick while ((zt = zio->io_transform_stack) != NULL) { 259e14bb325SJeff Bonwick if (zt->zt_transform != NULL) 260e14bb325SJeff Bonwick zt->zt_transform(zio, 261e14bb325SJeff Bonwick zt->zt_orig_data, zt->zt_orig_size); 262fa9e4066Sahrens 263e14bb325SJeff Bonwick zio_buf_free(zio->io_data, zt->zt_bufsize); 264fa9e4066Sahrens 265e14bb325SJeff Bonwick zio->io_data = zt->zt_orig_data; 266e14bb325SJeff Bonwick zio->io_size = zt->zt_orig_size; 267e14bb325SJeff Bonwick zio->io_transform_stack = zt->zt_next; 268fa9e4066Sahrens 269e14bb325SJeff Bonwick kmem_free(zt, sizeof (zio_transform_t)); 270fa9e4066Sahrens } 271fa9e4066Sahrens } 272fa9e4066Sahrens 273e14bb325SJeff Bonwick /* 274e14bb325SJeff Bonwick * ========================================================================== 275e14bb325SJeff Bonwick * I/O transform callbacks for subblocks and decompression 276e14bb325SJeff Bonwick * ========================================================================== 277e14bb325SJeff Bonwick */ 278e14bb325SJeff Bonwick static void 279e14bb325SJeff Bonwick zio_subblock(zio_t *zio, void *data, uint64_t size) 280e14bb325SJeff Bonwick { 281e14bb325SJeff Bonwick ASSERT(zio->io_size > size); 282e14bb325SJeff Bonwick 283e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ) 284e14bb325SJeff Bonwick bcopy(zio->io_data, data, size); 285e14bb325SJeff Bonwick } 286e14bb325SJeff Bonwick 287e14bb325SJeff Bonwick static void 288e14bb325SJeff Bonwick zio_decompress(zio_t *zio, void *data, uint64_t size) 289e14bb325SJeff Bonwick { 290e14bb325SJeff Bonwick if (zio->io_error == 0 && 291e14bb325SJeff Bonwick zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), 292e14bb325SJeff Bonwick zio->io_data, zio->io_size, data, size) != 0) 293e14bb325SJeff Bonwick zio->io_error = EIO; 294e14bb325SJeff Bonwick } 295e14bb325SJeff Bonwick 296e14bb325SJeff Bonwick /* 297e14bb325SJeff Bonwick * ========================================================================== 298e14bb325SJeff Bonwick * I/O parent/child relationships and pipeline interlocks 299e14bb325SJeff Bonwick * ========================================================================== 300e14bb325SJeff Bonwick */ 301e14bb325SJeff Bonwick 302e14bb325SJeff Bonwick static void 303e14bb325SJeff Bonwick zio_add_child(zio_t *pio, zio_t *zio) 304e14bb325SJeff Bonwick { 305e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 306e14bb325SJeff Bonwick if (zio->io_stage < ZIO_STAGE_READY) 307e14bb325SJeff Bonwick pio->io_children[zio->io_child_type][ZIO_WAIT_READY]++; 308e14bb325SJeff Bonwick if (zio->io_stage < ZIO_STAGE_DONE) 309e14bb325SJeff Bonwick pio->io_children[zio->io_child_type][ZIO_WAIT_DONE]++; 310e14bb325SJeff Bonwick zio->io_sibling_prev = NULL; 311e14bb325SJeff Bonwick zio->io_sibling_next = pio->io_child; 312e14bb325SJeff Bonwick if (pio->io_child != NULL) 313e14bb325SJeff Bonwick pio->io_child->io_sibling_prev = zio; 314e14bb325SJeff Bonwick pio->io_child = zio; 315e14bb325SJeff Bonwick zio->io_parent = pio; 316e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 317e14bb325SJeff Bonwick } 318e14bb325SJeff Bonwick 319fa9e4066Sahrens static void 320e14bb325SJeff Bonwick zio_remove_child(zio_t *pio, zio_t *zio) 321e14bb325SJeff Bonwick { 322e14bb325SJeff Bonwick zio_t *next, *prev; 323e14bb325SJeff Bonwick 324e14bb325SJeff Bonwick ASSERT(zio->io_parent == pio); 325e14bb325SJeff Bonwick 326e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 327e14bb325SJeff Bonwick next = zio->io_sibling_next; 328e14bb325SJeff Bonwick prev = zio->io_sibling_prev; 329e14bb325SJeff Bonwick if (next != NULL) 330e14bb325SJeff Bonwick next->io_sibling_prev = prev; 331e14bb325SJeff Bonwick if (prev != NULL) 332e14bb325SJeff Bonwick prev->io_sibling_next = next; 333e14bb325SJeff Bonwick if (pio->io_child == zio) 334e14bb325SJeff Bonwick pio->io_child = next; 335e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 336e14bb325SJeff Bonwick } 337e14bb325SJeff Bonwick 338e14bb325SJeff Bonwick static boolean_t 339e14bb325SJeff Bonwick zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) 340fa9e4066Sahrens { 341e14bb325SJeff Bonwick uint64_t *countp = &zio->io_children[child][wait]; 342e14bb325SJeff Bonwick boolean_t waiting = B_FALSE; 343e14bb325SJeff Bonwick 344e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 345e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 346e14bb325SJeff Bonwick if (*countp != 0) { 347e14bb325SJeff Bonwick zio->io_stage--; 348e14bb325SJeff Bonwick zio->io_stall = countp; 349e14bb325SJeff Bonwick waiting = B_TRUE; 350e14bb325SJeff Bonwick } 351e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 352e14bb325SJeff Bonwick 353e14bb325SJeff Bonwick return (waiting); 354e14bb325SJeff Bonwick } 355fa9e4066Sahrens 356e14bb325SJeff Bonwick static void 357e14bb325SJeff Bonwick zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) 358e14bb325SJeff Bonwick { 359e14bb325SJeff Bonwick uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; 360e14bb325SJeff Bonwick int *errorp = &pio->io_child_error[zio->io_child_type]; 361fa9e4066Sahrens 362e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 363e14bb325SJeff Bonwick if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 364e14bb325SJeff Bonwick *errorp = zio_worst_error(*errorp, zio->io_error); 365e14bb325SJeff Bonwick pio->io_reexecute |= zio->io_reexecute; 366e14bb325SJeff Bonwick ASSERT3U(*countp, >, 0); 367e14bb325SJeff Bonwick if (--*countp == 0 && pio->io_stall == countp) { 368e14bb325SJeff Bonwick pio->io_stall = NULL; 369e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 370e14bb325SJeff Bonwick zio_execute(pio); 371e14bb325SJeff Bonwick } else { 372e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 373fa9e4066Sahrens } 374fa9e4066Sahrens } 375fa9e4066Sahrens 376e14bb325SJeff Bonwick static void 377e14bb325SJeff Bonwick zio_inherit_child_errors(zio_t *zio, enum zio_child c) 378e14bb325SJeff Bonwick { 379e14bb325SJeff Bonwick if (zio->io_child_error[c] != 0 && zio->io_error == 0) 380e14bb325SJeff Bonwick zio->io_error = zio->io_child_error[c]; 381e14bb325SJeff Bonwick } 382e14bb325SJeff Bonwick 383fa9e4066Sahrens /* 384fa9e4066Sahrens * ========================================================================== 385e14bb325SJeff Bonwick * Create the various types of I/O (read, write, free, etc) 386fa9e4066Sahrens * ========================================================================== 387fa9e4066Sahrens */ 388fa9e4066Sahrens static zio_t * 389fa9e4066Sahrens zio_create(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 390fa9e4066Sahrens void *data, uint64_t size, zio_done_func_t *done, void *private, 391e14bb325SJeff Bonwick zio_type_t type, int priority, int flags, vdev_t *vd, uint64_t offset, 392e14bb325SJeff Bonwick const zbookmark_t *zb, uint8_t stage, uint32_t pipeline) 393fa9e4066Sahrens { 394fa9e4066Sahrens zio_t *zio; 395fa9e4066Sahrens 396fa9e4066Sahrens ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); 397fa9e4066Sahrens ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); 398e14bb325SJeff Bonwick ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); 399fa9e4066Sahrens 400e14bb325SJeff Bonwick ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); 401e14bb325SJeff Bonwick ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); 402e14bb325SJeff Bonwick ASSERT(vd || stage == ZIO_STAGE_OPEN); 403088f3894Sahrens 404ccae0b50Seschrock zio = kmem_cache_alloc(zio_cache, KM_SLEEP); 405ccae0b50Seschrock bzero(zio, sizeof (zio_t)); 406e14bb325SJeff Bonwick 407e14bb325SJeff Bonwick mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); 408e14bb325SJeff Bonwick cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); 409e14bb325SJeff Bonwick 410e14bb325SJeff Bonwick if (vd != NULL) 411e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_VDEV; 412e14bb325SJeff Bonwick else if (flags & ZIO_FLAG_GANG_CHILD) 413e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_GANG; 414e14bb325SJeff Bonwick else 415e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_LOGICAL; 416e14bb325SJeff Bonwick 417fa9e4066Sahrens if (bp != NULL) { 418fa9e4066Sahrens zio->io_bp = bp; 419fa9e4066Sahrens zio->io_bp_copy = *bp; 420fa9e4066Sahrens zio->io_bp_orig = *bp; 421e14bb325SJeff Bonwick if (type != ZIO_TYPE_WRITE) 422e14bb325SJeff Bonwick zio->io_bp = &zio->io_bp_copy; /* so caller can free */ 423e14bb325SJeff Bonwick if (zio->io_child_type == ZIO_CHILD_LOGICAL) { 424e14bb325SJeff Bonwick if (BP_IS_GANG(bp)) 425e14bb325SJeff Bonwick pipeline |= ZIO_GANG_STAGES; 426e14bb325SJeff Bonwick zio->io_logical = zio; 427e14bb325SJeff Bonwick } 428fa9e4066Sahrens } 429e14bb325SJeff Bonwick 430e14bb325SJeff Bonwick zio->io_spa = spa; 431e14bb325SJeff Bonwick zio->io_txg = txg; 432e14bb325SJeff Bonwick zio->io_data = data; 433e14bb325SJeff Bonwick zio->io_size = size; 434fa9e4066Sahrens zio->io_done = done; 435fa9e4066Sahrens zio->io_private = private; 436fa9e4066Sahrens zio->io_type = type; 437fa9e4066Sahrens zio->io_priority = priority; 438e14bb325SJeff Bonwick zio->io_vd = vd; 439e14bb325SJeff Bonwick zio->io_offset = offset; 440e14bb325SJeff Bonwick zio->io_orig_flags = zio->io_flags = flags; 441e14bb325SJeff Bonwick zio->io_orig_stage = zio->io_stage = stage; 442e14bb325SJeff Bonwick zio->io_orig_pipeline = zio->io_pipeline = pipeline; 443fa9e4066Sahrens 444e14bb325SJeff Bonwick if (zb != NULL) 445e14bb325SJeff Bonwick zio->io_bookmark = *zb; 446e14bb325SJeff Bonwick 447e14bb325SJeff Bonwick if (pio != NULL) { 448e14bb325SJeff Bonwick /* 449e14bb325SJeff Bonwick * Logical I/Os can have logical, gang, or vdev children. 450e14bb325SJeff Bonwick * Gang I/Os can have gang or vdev children. 451e14bb325SJeff Bonwick * Vdev I/Os can only have vdev children. 452e14bb325SJeff Bonwick * The following ASSERT captures all of these constraints. 453e14bb325SJeff Bonwick */ 454e14bb325SJeff Bonwick ASSERT(zio->io_child_type <= pio->io_child_type); 455e14bb325SJeff Bonwick if (zio->io_logical == NULL) 456ea8dc4b6Seschrock zio->io_logical = pio->io_logical; 457e14bb325SJeff Bonwick zio_add_child(pio, zio); 458fa9e4066Sahrens } 459fa9e4066Sahrens 460fa9e4066Sahrens return (zio); 461fa9e4066Sahrens } 462fa9e4066Sahrens 4630a4e9518Sgw static void 464e14bb325SJeff Bonwick zio_destroy(zio_t *zio) 4650a4e9518Sgw { 466e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 467e14bb325SJeff Bonwick uint8_t async_root = zio->io_async_root; 468e14bb325SJeff Bonwick 469e14bb325SJeff Bonwick mutex_destroy(&zio->io_lock); 470e14bb325SJeff Bonwick cv_destroy(&zio->io_cv); 471e14bb325SJeff Bonwick kmem_cache_free(zio_cache, zio); 4720a4e9518Sgw 473e14bb325SJeff Bonwick if (async_root) { 474e14bb325SJeff Bonwick mutex_enter(&spa->spa_async_root_lock); 475e14bb325SJeff Bonwick if (--spa->spa_async_root_count == 0) 476e14bb325SJeff Bonwick cv_broadcast(&spa->spa_async_root_cv); 477e14bb325SJeff Bonwick mutex_exit(&spa->spa_async_root_lock); 478e14bb325SJeff Bonwick } 4790a4e9518Sgw } 4800a4e9518Sgw 481fa9e4066Sahrens zio_t * 482fa9e4066Sahrens zio_null(zio_t *pio, spa_t *spa, zio_done_func_t *done, void *private, 483fa9e4066Sahrens int flags) 484fa9e4066Sahrens { 485fa9e4066Sahrens zio_t *zio; 486fa9e4066Sahrens 487fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 488e14bb325SJeff Bonwick ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, NULL, 0, NULL, 489e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); 490fa9e4066Sahrens 491fa9e4066Sahrens return (zio); 492fa9e4066Sahrens } 493fa9e4066Sahrens 494fa9e4066Sahrens zio_t * 495fa9e4066Sahrens zio_root(spa_t *spa, zio_done_func_t *done, void *private, int flags) 496fa9e4066Sahrens { 497fa9e4066Sahrens return (zio_null(NULL, spa, done, private, flags)); 498fa9e4066Sahrens } 499fa9e4066Sahrens 500fa9e4066Sahrens zio_t * 501e14bb325SJeff Bonwick zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 502e14bb325SJeff Bonwick void *data, uint64_t size, zio_done_func_t *done, void *private, 503088f3894Sahrens int priority, int flags, const zbookmark_t *zb) 504fa9e4066Sahrens { 505fa9e4066Sahrens zio_t *zio; 506fa9e4066Sahrens 507088f3894Sahrens zio = zio_create(pio, spa, bp->blk_birth, (blkptr_t *)bp, 508088f3894Sahrens data, size, done, private, 509e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, NULL, 0, zb, 510faafa6e3Sahrens ZIO_STAGE_OPEN, ZIO_READ_PIPELINE); 511fa9e4066Sahrens 512fa9e4066Sahrens return (zio); 513fa9e4066Sahrens } 514fa9e4066Sahrens 51582c9918fSTim Haley void 51682c9918fSTim Haley zio_skip_write(zio_t *zio) 51782c9918fSTim Haley { 51882c9918fSTim Haley ASSERT(zio->io_type == ZIO_TYPE_WRITE); 51982c9918fSTim Haley ASSERT(zio->io_stage == ZIO_STAGE_READY); 52082c9918fSTim Haley ASSERT(!BP_IS_GANG(zio->io_bp)); 52182c9918fSTim Haley 52282c9918fSTim Haley zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 52382c9918fSTim Haley } 52482c9918fSTim Haley 525fa9e4066Sahrens zio_t * 526e14bb325SJeff Bonwick zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 527e14bb325SJeff Bonwick void *data, uint64_t size, zio_prop_t *zp, 528e14bb325SJeff Bonwick zio_done_func_t *ready, zio_done_func_t *done, void *private, 529e14bb325SJeff Bonwick int priority, int flags, const zbookmark_t *zb) 530fa9e4066Sahrens { 531fa9e4066Sahrens zio_t *zio; 532fa9e4066Sahrens 533e14bb325SJeff Bonwick ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && 534e14bb325SJeff Bonwick zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && 535e14bb325SJeff Bonwick zp->zp_compress >= ZIO_COMPRESS_OFF && 536e14bb325SJeff Bonwick zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && 537e14bb325SJeff Bonwick zp->zp_type < DMU_OT_NUMTYPES && 538e14bb325SJeff Bonwick zp->zp_level < 32 && 539e14bb325SJeff Bonwick zp->zp_ndvas > 0 && 540e14bb325SJeff Bonwick zp->zp_ndvas <= spa_max_replication(spa)); 541e14bb325SJeff Bonwick ASSERT(ready != NULL); 5420a4e9518Sgw 543fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 544e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 545fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PIPELINE); 546fa9e4066Sahrens 547c717a561Smaybee zio->io_ready = ready; 548e14bb325SJeff Bonwick zio->io_prop = *zp; 549fa9e4066Sahrens 550fa9e4066Sahrens return (zio); 551fa9e4066Sahrens } 552fa9e4066Sahrens 553fa9e4066Sahrens zio_t * 554e14bb325SJeff Bonwick zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, 555e14bb325SJeff Bonwick uint64_t size, zio_done_func_t *done, void *private, int priority, 556e14bb325SJeff Bonwick int flags, zbookmark_t *zb) 557fa9e4066Sahrens { 558fa9e4066Sahrens zio_t *zio; 559fa9e4066Sahrens 560fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 561e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 562e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); 563fa9e4066Sahrens 564fa9e4066Sahrens return (zio); 565fa9e4066Sahrens } 566fa9e4066Sahrens 567fa9e4066Sahrens zio_t * 568fa9e4066Sahrens zio_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 569e14bb325SJeff Bonwick zio_done_func_t *done, void *private, int flags) 570fa9e4066Sahrens { 571fa9e4066Sahrens zio_t *zio; 572fa9e4066Sahrens 573fa9e4066Sahrens ASSERT(!BP_IS_HOLE(bp)); 574fa9e4066Sahrens 575e14bb325SJeff Bonwick if (bp->blk_fill == BLK_FILL_ALREADY_FREED) 576e14bb325SJeff Bonwick return (zio_null(pio, spa, NULL, NULL, flags)); 577e14bb325SJeff Bonwick 578fa9e4066Sahrens if (txg == spa->spa_syncing_txg && 579e14bb325SJeff Bonwick spa_sync_pass(spa) > SYNC_PASS_DEFERRED_FREE) { 580fa9e4066Sahrens bplist_enqueue_deferred(&spa->spa_sync_bplist, bp); 581e14bb325SJeff Bonwick return (zio_null(pio, spa, NULL, NULL, flags)); 582fa9e4066Sahrens } 583fa9e4066Sahrens 584e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 585e14bb325SJeff Bonwick done, private, ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, flags, 586e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_FREE_PIPELINE); 587fa9e4066Sahrens 588fa9e4066Sahrens return (zio); 589fa9e4066Sahrens } 590fa9e4066Sahrens 591fa9e4066Sahrens zio_t * 592fa9e4066Sahrens zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 593e14bb325SJeff Bonwick zio_done_func_t *done, void *private, int flags) 594fa9e4066Sahrens { 595fa9e4066Sahrens zio_t *zio; 596fa9e4066Sahrens 597fa9e4066Sahrens /* 598fa9e4066Sahrens * A claim is an allocation of a specific block. Claims are needed 599fa9e4066Sahrens * to support immediate writes in the intent log. The issue is that 600fa9e4066Sahrens * immediate writes contain committed data, but in a txg that was 601fa9e4066Sahrens * *not* committed. Upon opening the pool after an unclean shutdown, 602fa9e4066Sahrens * the intent log claims all blocks that contain immediate write data 603fa9e4066Sahrens * so that the SPA knows they're in use. 604fa9e4066Sahrens * 605fa9e4066Sahrens * All claims *must* be resolved in the first txg -- before the SPA 606fa9e4066Sahrens * starts allocating blocks -- so that nothing is allocated twice. 607fa9e4066Sahrens */ 608fa9e4066Sahrens ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); 609fa9e4066Sahrens ASSERT3U(spa_first_txg(spa), <=, txg); 610fa9e4066Sahrens 611e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 612e14bb325SJeff Bonwick done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, 613e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); 614fa9e4066Sahrens 615fa9e4066Sahrens return (zio); 616fa9e4066Sahrens } 617fa9e4066Sahrens 618fa9e4066Sahrens zio_t * 619fa9e4066Sahrens zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 620fa9e4066Sahrens zio_done_func_t *done, void *private, int priority, int flags) 621fa9e4066Sahrens { 622fa9e4066Sahrens zio_t *zio; 623fa9e4066Sahrens int c; 624fa9e4066Sahrens 625fa9e4066Sahrens if (vd->vdev_children == 0) { 626fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 627e14bb325SJeff Bonwick ZIO_TYPE_IOCTL, priority, flags, vd, 0, NULL, 628fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); 629fa9e4066Sahrens 630fa9e4066Sahrens zio->io_cmd = cmd; 631fa9e4066Sahrens } else { 632fa9e4066Sahrens zio = zio_null(pio, spa, NULL, NULL, flags); 633fa9e4066Sahrens 634fa9e4066Sahrens for (c = 0; c < vd->vdev_children; c++) 635fa9e4066Sahrens zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, 636fa9e4066Sahrens done, private, priority, flags)); 637fa9e4066Sahrens } 638fa9e4066Sahrens 639fa9e4066Sahrens return (zio); 640fa9e4066Sahrens } 641fa9e4066Sahrens 642fa9e4066Sahrens zio_t * 643fa9e4066Sahrens zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 644fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 645fa94a07fSbrendan int priority, int flags, boolean_t labels) 646fa9e4066Sahrens { 647fa9e4066Sahrens zio_t *zio; 6480a4e9518Sgw 649e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 650e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 651e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 652e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 653fa9e4066Sahrens 654e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 655e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, vd, offset, NULL, 656fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); 657fa9e4066Sahrens 658e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 659fa9e4066Sahrens 660fa9e4066Sahrens return (zio); 661fa9e4066Sahrens } 662fa9e4066Sahrens 663fa9e4066Sahrens zio_t * 664fa9e4066Sahrens zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 665fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 666fa94a07fSbrendan int priority, int flags, boolean_t labels) 667fa9e4066Sahrens { 668fa9e4066Sahrens zio_t *zio; 6690a4e9518Sgw 670e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 671e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 672e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 673e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 674fa9e4066Sahrens 675e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 676e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL, 677fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); 678fa9e4066Sahrens 679e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 680fa9e4066Sahrens 681fa9e4066Sahrens if (zio_checksum_table[checksum].ci_zbt) { 682fa9e4066Sahrens /* 683fa9e4066Sahrens * zbt checksums are necessarily destructive -- they modify 684e14bb325SJeff Bonwick * the end of the write buffer to hold the verifier/checksum. 685fa9e4066Sahrens * Therefore, we must make a local copy in case the data is 686e14bb325SJeff Bonwick * being written to multiple places in parallel. 687fa9e4066Sahrens */ 688e14bb325SJeff Bonwick void *wbuf = zio_buf_alloc(size); 689fa9e4066Sahrens bcopy(data, wbuf, size); 690e14bb325SJeff Bonwick zio_push_transform(zio, wbuf, size, size, NULL); 691fa9e4066Sahrens } 692fa9e4066Sahrens 693fa9e4066Sahrens return (zio); 694fa9e4066Sahrens } 695fa9e4066Sahrens 696fa9e4066Sahrens /* 697e14bb325SJeff Bonwick * Create a child I/O to do some work for us. 698fa9e4066Sahrens */ 699fa9e4066Sahrens zio_t * 700e14bb325SJeff Bonwick zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, 701fa9e4066Sahrens void *data, uint64_t size, int type, int priority, int flags, 702fa9e4066Sahrens zio_done_func_t *done, void *private) 703fa9e4066Sahrens { 704fa9e4066Sahrens uint32_t pipeline = ZIO_VDEV_CHILD_PIPELINE; 705e14bb325SJeff Bonwick zio_t *zio; 706e14bb325SJeff Bonwick 707e14bb325SJeff Bonwick ASSERT(vd->vdev_parent == 708e14bb325SJeff Bonwick (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); 709fa9e4066Sahrens 710fa9e4066Sahrens if (type == ZIO_TYPE_READ && bp != NULL) { 711fa9e4066Sahrens /* 712fa9e4066Sahrens * If we have the bp, then the child should perform the 713fa9e4066Sahrens * checksum and the parent need not. This pushes error 714fa9e4066Sahrens * detection as close to the leaves as possible and 715fa9e4066Sahrens * eliminates redundant checksums in the interior nodes. 716fa9e4066Sahrens */ 717fa9e4066Sahrens pipeline |= 1U << ZIO_STAGE_CHECKSUM_VERIFY; 718e14bb325SJeff Bonwick pio->io_pipeline &= ~(1U << ZIO_STAGE_CHECKSUM_VERIFY); 719fa9e4066Sahrens } 720fa9e4066Sahrens 721e14bb325SJeff Bonwick if (vd->vdev_children == 0) 722e14bb325SJeff Bonwick offset += VDEV_LABEL_START_SIZE; 723e14bb325SJeff Bonwick 724e14bb325SJeff Bonwick zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, 725fa9e4066Sahrens done, private, type, priority, 726e14bb325SJeff Bonwick (pio->io_flags & ZIO_FLAG_VDEV_INHERIT) | 727e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | flags, 728e14bb325SJeff Bonwick vd, offset, &pio->io_bookmark, 72944cd46caSbillm ZIO_STAGE_VDEV_IO_START - 1, pipeline); 730fa9e4066Sahrens 731e14bb325SJeff Bonwick return (zio); 73232b87932Sek } 73332b87932Sek 734e14bb325SJeff Bonwick zio_t * 735e14bb325SJeff Bonwick zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, 736e14bb325SJeff Bonwick int type, int priority, int flags, zio_done_func_t *done, void *private) 737fa9e4066Sahrens { 738e14bb325SJeff Bonwick zio_t *zio; 739fa9e4066Sahrens 740e14bb325SJeff Bonwick ASSERT(vd->vdev_ops->vdev_op_leaf); 741fa9e4066Sahrens 742e14bb325SJeff Bonwick zio = zio_create(NULL, vd->vdev_spa, 0, NULL, 743e14bb325SJeff Bonwick data, size, done, private, type, priority, 744e14bb325SJeff Bonwick flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY, 745e14bb325SJeff Bonwick vd, offset, NULL, 746e14bb325SJeff Bonwick ZIO_STAGE_VDEV_IO_START - 1, ZIO_VDEV_CHILD_PIPELINE); 747fa9e4066Sahrens 748e14bb325SJeff Bonwick return (zio); 749e05725b1Sbonwick } 750e05725b1Sbonwick 751e05725b1Sbonwick void 752e14bb325SJeff Bonwick zio_flush(zio_t *zio, vdev_t *vd) 753e05725b1Sbonwick { 754e14bb325SJeff Bonwick zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, 755e14bb325SJeff Bonwick NULL, NULL, ZIO_PRIORITY_NOW, 756e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); 757fa9e4066Sahrens } 758fa9e4066Sahrens 759fa9e4066Sahrens /* 760fa9e4066Sahrens * ========================================================================== 761e14bb325SJeff Bonwick * Prepare to read and write logical blocks 762fa9e4066Sahrens * ========================================================================== 763fa9e4066Sahrens */ 764e14bb325SJeff Bonwick 765e05725b1Sbonwick static int 766e14bb325SJeff Bonwick zio_read_bp_init(zio_t *zio) 767fa9e4066Sahrens { 768e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 769e05725b1Sbonwick 770e14bb325SJeff Bonwick if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && zio->io_logical == zio) { 771e14bb325SJeff Bonwick uint64_t csize = BP_GET_PSIZE(bp); 772e14bb325SJeff Bonwick void *cbuf = zio_buf_alloc(csize); 773e05725b1Sbonwick 774e14bb325SJeff Bonwick zio_push_transform(zio, cbuf, csize, csize, zio_decompress); 775e14bb325SJeff Bonwick } 776fa9e4066Sahrens 777e14bb325SJeff Bonwick if (!dmu_ot[BP_GET_TYPE(bp)].ot_metadata && BP_GET_LEVEL(bp) == 0) 778e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 779fa9e4066Sahrens 780e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 781fa9e4066Sahrens } 782fa9e4066Sahrens 783e05725b1Sbonwick static int 784e14bb325SJeff Bonwick zio_write_bp_init(zio_t *zio) 7850a4e9518Sgw { 786e14bb325SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 787e14bb325SJeff Bonwick int compress = zp->zp_compress; 788e05725b1Sbonwick blkptr_t *bp = zio->io_bp; 789e14bb325SJeff Bonwick void *cbuf; 790e14bb325SJeff Bonwick uint64_t lsize = zio->io_size; 791e14bb325SJeff Bonwick uint64_t csize = lsize; 792e14bb325SJeff Bonwick uint64_t cbufsize = 0; 793e14bb325SJeff Bonwick int pass = 1; 794e05725b1Sbonwick 795e14bb325SJeff Bonwick /* 796e14bb325SJeff Bonwick * If our children haven't all reached the ready stage, 797e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 798e14bb325SJeff Bonwick */ 799e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 800e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) 801e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 8020a4e9518Sgw 803e14bb325SJeff Bonwick if (!IO_IS_ALLOCATING(zio)) 804e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 8050a4e9518Sgw 806e14bb325SJeff Bonwick ASSERT(compress != ZIO_COMPRESS_INHERIT); 8070a4e9518Sgw 808e14bb325SJeff Bonwick if (bp->blk_birth == zio->io_txg) { 809e14bb325SJeff Bonwick /* 810e14bb325SJeff Bonwick * We're rewriting an existing block, which means we're 811e14bb325SJeff Bonwick * working on behalf of spa_sync(). For spa_sync() to 812e14bb325SJeff Bonwick * converge, it must eventually be the case that we don't 813e14bb325SJeff Bonwick * have to allocate new blocks. But compression changes 814e14bb325SJeff Bonwick * the blocksize, which forces a reallocate, and makes 815e14bb325SJeff Bonwick * convergence take longer. Therefore, after the first 816e14bb325SJeff Bonwick * few passes, stop compressing to ensure convergence. 817e14bb325SJeff Bonwick */ 818e14bb325SJeff Bonwick pass = spa_sync_pass(zio->io_spa); 819e14bb325SJeff Bonwick ASSERT(pass > 1); 820e05725b1Sbonwick 821e14bb325SJeff Bonwick if (pass > SYNC_PASS_DONT_COMPRESS) 822e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 823e05725b1Sbonwick 824e14bb325SJeff Bonwick /* 825e14bb325SJeff Bonwick * Only MOS (objset 0) data should need to be rewritten. 826e14bb325SJeff Bonwick */ 827e14bb325SJeff Bonwick ASSERT(zio->io_logical->io_bookmark.zb_objset == 0); 8280a4e9518Sgw 829e14bb325SJeff Bonwick /* Make sure someone doesn't change their mind on overwrites */ 830e14bb325SJeff Bonwick ASSERT(MIN(zp->zp_ndvas + BP_IS_GANG(bp), 831e14bb325SJeff Bonwick spa_max_replication(zio->io_spa)) == BP_GET_NDVAS(bp)); 832e14bb325SJeff Bonwick } 833fa9e4066Sahrens 834e14bb325SJeff Bonwick if (compress != ZIO_COMPRESS_OFF) { 835e14bb325SJeff Bonwick if (!zio_compress_data(compress, zio->io_data, zio->io_size, 836e14bb325SJeff Bonwick &cbuf, &csize, &cbufsize)) { 837e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 838e14bb325SJeff Bonwick } else if (csize != 0) { 839e14bb325SJeff Bonwick zio_push_transform(zio, cbuf, csize, cbufsize, NULL); 840e14bb325SJeff Bonwick } 841e14bb325SJeff Bonwick } 842c717a561Smaybee 843e14bb325SJeff Bonwick /* 844e14bb325SJeff Bonwick * The final pass of spa_sync() must be all rewrites, but the first 845e14bb325SJeff Bonwick * few passes offer a trade-off: allocating blocks defers convergence, 846e14bb325SJeff Bonwick * but newly allocated blocks are sequential, so they can be written 847e14bb325SJeff Bonwick * to disk faster. Therefore, we allow the first few passes of 848e14bb325SJeff Bonwick * spa_sync() to allocate new blocks, but force rewrites after that. 849e14bb325SJeff Bonwick * There should only be a handful of blocks after pass 1 in any case. 850e14bb325SJeff Bonwick */ 851e14bb325SJeff Bonwick if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == csize && 852e14bb325SJeff Bonwick pass > SYNC_PASS_REWRITE) { 853e14bb325SJeff Bonwick ASSERT(csize != 0); 854e14bb325SJeff Bonwick uint32_t gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; 855e14bb325SJeff Bonwick zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; 856e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_REWRITE; 857e14bb325SJeff Bonwick } else { 858e14bb325SJeff Bonwick BP_ZERO(bp); 859e14bb325SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 860e14bb325SJeff Bonwick } 861fa9e4066Sahrens 862e14bb325SJeff Bonwick if (csize == 0) { 863e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 864e14bb325SJeff Bonwick } else { 865e14bb325SJeff Bonwick ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); 866e14bb325SJeff Bonwick BP_SET_LSIZE(bp, lsize); 867e14bb325SJeff Bonwick BP_SET_PSIZE(bp, csize); 868e14bb325SJeff Bonwick BP_SET_COMPRESS(bp, compress); 869e14bb325SJeff Bonwick BP_SET_CHECKSUM(bp, zp->zp_checksum); 870e14bb325SJeff Bonwick BP_SET_TYPE(bp, zp->zp_type); 871e14bb325SJeff Bonwick BP_SET_LEVEL(bp, zp->zp_level); 872e14bb325SJeff Bonwick BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 873e14bb325SJeff Bonwick } 874fa9e4066Sahrens 875e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 876fa9e4066Sahrens } 877fa9e4066Sahrens 878e14bb325SJeff Bonwick /* 879e14bb325SJeff Bonwick * ========================================================================== 880e14bb325SJeff Bonwick * Execute the I/O pipeline 881e14bb325SJeff Bonwick * ========================================================================== 882e14bb325SJeff Bonwick */ 883e14bb325SJeff Bonwick 884e14bb325SJeff Bonwick static void 885e14bb325SJeff Bonwick zio_taskq_dispatch(zio_t *zio, enum zio_taskq_type q) 886fa9e4066Sahrens { 887e14bb325SJeff Bonwick zio_type_t t = zio->io_type; 8880a4e9518Sgw 8890a4e9518Sgw /* 890e14bb325SJeff Bonwick * If we're a config writer, the normal issue and interrupt threads 891e14bb325SJeff Bonwick * may all be blocked waiting for the config lock. In this case, 892e14bb325SJeff Bonwick * select the otherwise-unused taskq for ZIO_TYPE_NULL. 8930a4e9518Sgw */ 894e14bb325SJeff Bonwick if (zio->io_flags & ZIO_FLAG_CONFIG_WRITER) 895e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 8960a4e9518Sgw 8970a4e9518Sgw /* 898e14bb325SJeff Bonwick * A similar issue exists for the L2ARC write thread until L2ARC 2.0. 8990a4e9518Sgw */ 900e14bb325SJeff Bonwick if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) 901e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 9020a4e9518Sgw 903e14bb325SJeff Bonwick (void) taskq_dispatch(zio->io_spa->spa_zio_taskq[t][q], 904e14bb325SJeff Bonwick (task_func_t *)zio_execute, zio, TQ_SLEEP); 905e14bb325SJeff Bonwick } 9060a4e9518Sgw 907e14bb325SJeff Bonwick static boolean_t 908e14bb325SJeff Bonwick zio_taskq_member(zio_t *zio, enum zio_taskq_type q) 909e14bb325SJeff Bonwick { 910e14bb325SJeff Bonwick kthread_t *executor = zio->io_executor; 911e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 9120a4e9518Sgw 913e14bb325SJeff Bonwick for (zio_type_t t = 0; t < ZIO_TYPES; t++) 914e14bb325SJeff Bonwick if (taskq_member(spa->spa_zio_taskq[t][q], executor)) 915e14bb325SJeff Bonwick return (B_TRUE); 9160a4e9518Sgw 917e14bb325SJeff Bonwick return (B_FALSE); 918e14bb325SJeff Bonwick } 919e05725b1Sbonwick 920e14bb325SJeff Bonwick static int 921e14bb325SJeff Bonwick zio_issue_async(zio_t *zio) 922e14bb325SJeff Bonwick { 923e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 924e14bb325SJeff Bonwick 925e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 9260a4e9518Sgw } 9270a4e9518Sgw 928e14bb325SJeff Bonwick void 929e14bb325SJeff Bonwick zio_interrupt(zio_t *zio) 9300a4e9518Sgw { 931e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT); 932e14bb325SJeff Bonwick } 9330a4e9518Sgw 934e14bb325SJeff Bonwick /* 935e14bb325SJeff Bonwick * Execute the I/O pipeline until one of the following occurs: 936e14bb325SJeff Bonwick * (1) the I/O completes; (2) the pipeline stalls waiting for 937e14bb325SJeff Bonwick * dependent child I/Os; (3) the I/O issues, so we're waiting 938e14bb325SJeff Bonwick * for an I/O completion interrupt; (4) the I/O is delegated by 939e14bb325SJeff Bonwick * vdev-level caching or aggregation; (5) the I/O is deferred 940e14bb325SJeff Bonwick * due to vdev-level queueing; (6) the I/O is handed off to 941e14bb325SJeff Bonwick * another thread. In all cases, the pipeline stops whenever 942e14bb325SJeff Bonwick * there's no CPU work; it never burns a thread in cv_wait(). 943e14bb325SJeff Bonwick * 944e14bb325SJeff Bonwick * There's no locking on io_stage because there's no legitimate way 945e14bb325SJeff Bonwick * for multiple threads to be attempting to process the same I/O. 946e14bb325SJeff Bonwick */ 947e14bb325SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[ZIO_STAGES]; 9480a4e9518Sgw 949e14bb325SJeff Bonwick void 950e14bb325SJeff Bonwick zio_execute(zio_t *zio) 951e14bb325SJeff Bonwick { 952e14bb325SJeff Bonwick zio->io_executor = curthread; 9530a4e9518Sgw 954e14bb325SJeff Bonwick while (zio->io_stage < ZIO_STAGE_DONE) { 955e14bb325SJeff Bonwick uint32_t pipeline = zio->io_pipeline; 956e14bb325SJeff Bonwick zio_stage_t stage = zio->io_stage; 957e14bb325SJeff Bonwick int rv; 9580a4e9518Sgw 959e14bb325SJeff Bonwick ASSERT(!MUTEX_HELD(&zio->io_lock)); 9600a4e9518Sgw 961e14bb325SJeff Bonwick while (((1U << ++stage) & pipeline) == 0) 962e14bb325SJeff Bonwick continue; 963e14bb325SJeff Bonwick 964e14bb325SJeff Bonwick ASSERT(stage <= ZIO_STAGE_DONE); 965e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 9660a4e9518Sgw 9670a4e9518Sgw /* 968e14bb325SJeff Bonwick * If we are in interrupt context and this pipeline stage 969e14bb325SJeff Bonwick * will grab a config lock that is held across I/O, 970e14bb325SJeff Bonwick * issue async to avoid deadlock. 9710a4e9518Sgw */ 972e14bb325SJeff Bonwick if (((1U << stage) & ZIO_CONFIG_LOCK_BLOCKING_STAGES) && 973e14bb325SJeff Bonwick zio->io_vd == NULL && 974e14bb325SJeff Bonwick zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { 975e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 976e14bb325SJeff Bonwick return; 9770a4e9518Sgw } 9780a4e9518Sgw 979e14bb325SJeff Bonwick zio->io_stage = stage; 980e14bb325SJeff Bonwick rv = zio_pipeline[stage](zio); 9810a4e9518Sgw 982e14bb325SJeff Bonwick if (rv == ZIO_PIPELINE_STOP) 983e14bb325SJeff Bonwick return; 9840a4e9518Sgw 985e14bb325SJeff Bonwick ASSERT(rv == ZIO_PIPELINE_CONTINUE); 986e14bb325SJeff Bonwick } 9870a4e9518Sgw } 9880a4e9518Sgw 989e14bb325SJeff Bonwick /* 990e14bb325SJeff Bonwick * ========================================================================== 991e14bb325SJeff Bonwick * Initiate I/O, either sync or async 992e14bb325SJeff Bonwick * ========================================================================== 993e14bb325SJeff Bonwick */ 994e14bb325SJeff Bonwick int 995e14bb325SJeff Bonwick zio_wait(zio_t *zio) 9960a4e9518Sgw { 997e14bb325SJeff Bonwick int error; 9980a4e9518Sgw 999e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 1000e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 10010a4e9518Sgw 1002e14bb325SJeff Bonwick zio->io_waiter = curthread; 1003e05725b1Sbonwick 1004e14bb325SJeff Bonwick zio_execute(zio); 10050a4e9518Sgw 1006e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 1007e14bb325SJeff Bonwick while (zio->io_executor != NULL) 1008e14bb325SJeff Bonwick cv_wait(&zio->io_cv, &zio->io_lock); 1009e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 101032b87932Sek 1011e14bb325SJeff Bonwick error = zio->io_error; 1012e14bb325SJeff Bonwick zio_destroy(zio); 101332b87932Sek 1014e14bb325SJeff Bonwick return (error); 101532b87932Sek } 101632b87932Sek 1017e14bb325SJeff Bonwick void 1018e14bb325SJeff Bonwick zio_nowait(zio_t *zio) 10190a4e9518Sgw { 1020e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 1021fa9e4066Sahrens 1022e14bb325SJeff Bonwick if (zio->io_parent == NULL && zio->io_child_type == ZIO_CHILD_LOGICAL) { 1023ea8dc4b6Seschrock /* 1024e14bb325SJeff Bonwick * This is a logical async I/O with no parent to wait for it. 1025e14bb325SJeff Bonwick * Attach it to the pool's global async root zio so that 1026e14bb325SJeff Bonwick * spa_unload() has a way of waiting for async I/O to finish. 1027ea8dc4b6Seschrock */ 1028e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 1029e14bb325SJeff Bonwick zio->io_async_root = B_TRUE; 1030e14bb325SJeff Bonwick mutex_enter(&spa->spa_async_root_lock); 1031e14bb325SJeff Bonwick spa->spa_async_root_count++; 1032e14bb325SJeff Bonwick mutex_exit(&spa->spa_async_root_lock); 1033e14bb325SJeff Bonwick } 1034ea8dc4b6Seschrock 1035e14bb325SJeff Bonwick zio_execute(zio); 1036e14bb325SJeff Bonwick } 1037ea8dc4b6Seschrock 1038e14bb325SJeff Bonwick /* 1039e14bb325SJeff Bonwick * ========================================================================== 1040e14bb325SJeff Bonwick * Reexecute or suspend/resume failed I/O 1041e14bb325SJeff Bonwick * ========================================================================== 1042e14bb325SJeff Bonwick */ 1043fa9e4066Sahrens 1044e14bb325SJeff Bonwick static void 1045e14bb325SJeff Bonwick zio_reexecute(zio_t *pio) 1046e14bb325SJeff Bonwick { 1047e14bb325SJeff Bonwick zio_t *zio, *zio_next; 1048e05725b1Sbonwick 1049e14bb325SJeff Bonwick pio->io_flags = pio->io_orig_flags; 1050e14bb325SJeff Bonwick pio->io_stage = pio->io_orig_stage; 1051e14bb325SJeff Bonwick pio->io_pipeline = pio->io_orig_pipeline; 1052e14bb325SJeff Bonwick pio->io_reexecute = 0; 1053e14bb325SJeff Bonwick pio->io_error = 0; 1054e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 1055e14bb325SJeff Bonwick pio->io_child_error[c] = 0; 10560a4e9518Sgw 1057e14bb325SJeff Bonwick if (IO_IS_ALLOCATING(pio)) { 10580a4e9518Sgw /* 1059e14bb325SJeff Bonwick * Remember the failed bp so that the io_ready() callback 1060e14bb325SJeff Bonwick * can update its accounting upon reexecution. The block 1061e14bb325SJeff Bonwick * was already freed in zio_done(); we indicate this with 1062e14bb325SJeff Bonwick * a fill count of -1 so that zio_free() knows to skip it. 1063ea8dc4b6Seschrock */ 1064e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 1065e14bb325SJeff Bonwick ASSERT(bp->blk_birth == 0 || bp->blk_birth == pio->io_txg); 1066e14bb325SJeff Bonwick bp->blk_fill = BLK_FILL_ALREADY_FREED; 1067e14bb325SJeff Bonwick pio->io_bp_orig = *bp; 1068e14bb325SJeff Bonwick BP_ZERO(bp); 1069e14bb325SJeff Bonwick } 1070d58459f4Sek 1071e14bb325SJeff Bonwick /* 1072e14bb325SJeff Bonwick * As we reexecute pio's children, new children could be created. 1073e14bb325SJeff Bonwick * New children go to the head of the io_child list, however, 1074e14bb325SJeff Bonwick * so we will (correctly) not reexecute them. The key is that 1075e14bb325SJeff Bonwick * the remainder of the io_child list, from 'zio_next' onward, 1076e14bb325SJeff Bonwick * cannot be affected by any side effects of reexecuting 'zio'. 1077e14bb325SJeff Bonwick */ 1078e14bb325SJeff Bonwick for (zio = pio->io_child; zio != NULL; zio = zio_next) { 1079e14bb325SJeff Bonwick zio_next = zio->io_sibling_next; 1080e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 1081e14bb325SJeff Bonwick pio->io_children[zio->io_child_type][ZIO_WAIT_READY]++; 1082e14bb325SJeff Bonwick pio->io_children[zio->io_child_type][ZIO_WAIT_DONE]++; 1083e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 1084e14bb325SJeff Bonwick zio_reexecute(zio); 1085fa9e4066Sahrens } 1086e05725b1Sbonwick 1087e14bb325SJeff Bonwick /* 1088e14bb325SJeff Bonwick * Now that all children have been reexecuted, execute the parent. 1089e14bb325SJeff Bonwick */ 1090e14bb325SJeff Bonwick zio_execute(pio); 10910a4e9518Sgw } 10920a4e9518Sgw 1093e14bb325SJeff Bonwick void 1094e14bb325SJeff Bonwick zio_suspend(spa_t *spa, zio_t *zio) 10950a4e9518Sgw { 1096e14bb325SJeff Bonwick if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) 1097e14bb325SJeff Bonwick fm_panic("Pool '%s' has encountered an uncorrectable I/O " 1098e14bb325SJeff Bonwick "failure and the failure mode property for this pool " 1099e14bb325SJeff Bonwick "is set to panic.", spa_name(spa)); 11000a4e9518Sgw 1101e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); 11020a4e9518Sgw 1103e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1104fa9e4066Sahrens 1105e14bb325SJeff Bonwick if (spa->spa_suspend_zio_root == NULL) 1106e14bb325SJeff Bonwick spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, 0); 1107fa9e4066Sahrens 1108e14bb325SJeff Bonwick spa->spa_suspended = B_TRUE; 1109fa9e4066Sahrens 1110e14bb325SJeff Bonwick if (zio != NULL) { 1111e14bb325SJeff Bonwick ASSERT(zio != spa->spa_suspend_zio_root); 1112e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1113e14bb325SJeff Bonwick ASSERT(zio->io_parent == NULL); 1114e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_DONE); 1115e14bb325SJeff Bonwick zio_add_child(spa->spa_suspend_zio_root, zio); 1116e14bb325SJeff Bonwick } 1117fa9e4066Sahrens 1118e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1119e14bb325SJeff Bonwick } 1120fa9e4066Sahrens 1121e14bb325SJeff Bonwick void 1122e14bb325SJeff Bonwick zio_resume(spa_t *spa) 1123e14bb325SJeff Bonwick { 1124e14bb325SJeff Bonwick zio_t *pio, *zio; 1125fa9e4066Sahrens 1126b3995adbSahrens /* 1127e14bb325SJeff Bonwick * Reexecute all previously suspended i/o. 1128b3995adbSahrens */ 1129e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1130e14bb325SJeff Bonwick spa->spa_suspended = B_FALSE; 1131e14bb325SJeff Bonwick cv_broadcast(&spa->spa_suspend_cv); 1132e14bb325SJeff Bonwick pio = spa->spa_suspend_zio_root; 1133e14bb325SJeff Bonwick spa->spa_suspend_zio_root = NULL; 1134e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1135e14bb325SJeff Bonwick 1136e14bb325SJeff Bonwick if (pio == NULL) 1137e14bb325SJeff Bonwick return; 1138fa9e4066Sahrens 1139e14bb325SJeff Bonwick while ((zio = pio->io_child) != NULL) { 1140e14bb325SJeff Bonwick zio_remove_child(pio, zio); 1141e14bb325SJeff Bonwick zio->io_parent = NULL; 1142e14bb325SJeff Bonwick zio_reexecute(zio); 1143fa9e4066Sahrens } 1144e05725b1Sbonwick 1145e14bb325SJeff Bonwick ASSERT(pio->io_children[ZIO_CHILD_LOGICAL][ZIO_WAIT_DONE] == 0); 1146e14bb325SJeff Bonwick 1147e14bb325SJeff Bonwick (void) zio_wait(pio); 1148e14bb325SJeff Bonwick } 1149e14bb325SJeff Bonwick 1150e14bb325SJeff Bonwick void 1151e14bb325SJeff Bonwick zio_resume_wait(spa_t *spa) 1152e14bb325SJeff Bonwick { 1153e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1154e14bb325SJeff Bonwick while (spa_suspended(spa)) 1155e14bb325SJeff Bonwick cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); 1156e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1157fa9e4066Sahrens } 1158fa9e4066Sahrens 1159fa9e4066Sahrens /* 1160fa9e4066Sahrens * ========================================================================== 1161e14bb325SJeff Bonwick * Gang blocks. 1162e14bb325SJeff Bonwick * 1163e14bb325SJeff Bonwick * A gang block is a collection of small blocks that looks to the DMU 1164e14bb325SJeff Bonwick * like one large block. When zio_dva_allocate() cannot find a block 1165e14bb325SJeff Bonwick * of the requested size, due to either severe fragmentation or the pool 1166e14bb325SJeff Bonwick * being nearly full, it calls zio_write_gang_block() to construct the 1167e14bb325SJeff Bonwick * block from smaller fragments. 1168e14bb325SJeff Bonwick * 1169e14bb325SJeff Bonwick * A gang block consists of a gang header (zio_gbh_phys_t) and up to 1170e14bb325SJeff Bonwick * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like 1171e14bb325SJeff Bonwick * an indirect block: it's an array of block pointers. It consumes 1172e14bb325SJeff Bonwick * only one sector and hence is allocatable regardless of fragmentation. 1173e14bb325SJeff Bonwick * The gang header's bps point to its gang members, which hold the data. 1174e14bb325SJeff Bonwick * 1175e14bb325SJeff Bonwick * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> 1176e14bb325SJeff Bonwick * as the verifier to ensure uniqueness of the SHA256 checksum. 1177e14bb325SJeff Bonwick * Critically, the gang block bp's blk_cksum is the checksum of the data, 1178e14bb325SJeff Bonwick * not the gang header. This ensures that data block signatures (needed for 1179e14bb325SJeff Bonwick * deduplication) are independent of how the block is physically stored. 1180e14bb325SJeff Bonwick * 1181e14bb325SJeff Bonwick * Gang blocks can be nested: a gang member may itself be a gang block. 1182e14bb325SJeff Bonwick * Thus every gang block is a tree in which root and all interior nodes are 1183e14bb325SJeff Bonwick * gang headers, and the leaves are normal blocks that contain user data. 1184e14bb325SJeff Bonwick * The root of the gang tree is called the gang leader. 1185e14bb325SJeff Bonwick * 1186e14bb325SJeff Bonwick * To perform any operation (read, rewrite, free, claim) on a gang block, 1187e14bb325SJeff Bonwick * zio_gang_assemble() first assembles the gang tree (minus data leaves) 1188e14bb325SJeff Bonwick * in the io_gang_tree field of the original logical i/o by recursively 1189e14bb325SJeff Bonwick * reading the gang leader and all gang headers below it. This yields 1190e14bb325SJeff Bonwick * an in-core tree containing the contents of every gang header and the 1191e14bb325SJeff Bonwick * bps for every constituent of the gang block. 1192e14bb325SJeff Bonwick * 1193e14bb325SJeff Bonwick * With the gang tree now assembled, zio_gang_issue() just walks the gang tree 1194e14bb325SJeff Bonwick * and invokes a callback on each bp. To free a gang block, zio_gang_issue() 1195e14bb325SJeff Bonwick * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. 1196e14bb325SJeff Bonwick * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). 1197e14bb325SJeff Bonwick * zio_read_gang() is a wrapper around zio_read() that omits reading gang 1198e14bb325SJeff Bonwick * headers, since we already have those in io_gang_tree. zio_rewrite_gang() 1199e14bb325SJeff Bonwick * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() 1200e14bb325SJeff Bonwick * of the gang header plus zio_checksum_compute() of the data to update the 1201e14bb325SJeff Bonwick * gang header's blk_cksum as described above. 1202e14bb325SJeff Bonwick * 1203e14bb325SJeff Bonwick * The two-phase assemble/issue model solves the problem of partial failure -- 1204e14bb325SJeff Bonwick * what if you'd freed part of a gang block but then couldn't read the 1205e14bb325SJeff Bonwick * gang header for another part? Assembling the entire gang tree first 1206e14bb325SJeff Bonwick * ensures that all the necessary gang header I/O has succeeded before 1207e14bb325SJeff Bonwick * starting the actual work of free, claim, or write. Once the gang tree 1208e14bb325SJeff Bonwick * is assembled, free and claim are in-memory operations that cannot fail. 1209e14bb325SJeff Bonwick * 1210e14bb325SJeff Bonwick * In the event that a gang write fails, zio_dva_unallocate() walks the 1211e14bb325SJeff Bonwick * gang tree to immediately free (i.e. insert back into the space map) 1212e14bb325SJeff Bonwick * everything we've allocated. This ensures that we don't get ENOSPC 1213e14bb325SJeff Bonwick * errors during repeated suspend/resume cycles due to a flaky device. 1214e14bb325SJeff Bonwick * 1215e14bb325SJeff Bonwick * Gang rewrites only happen during sync-to-convergence. If we can't assemble 1216e14bb325SJeff Bonwick * the gang tree, we won't modify the block, so we can safely defer the free 1217e14bb325SJeff Bonwick * (knowing that the block is still intact). If we *can* assemble the gang 1218e14bb325SJeff Bonwick * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free 1219e14bb325SJeff Bonwick * each constituent bp and we can allocate a new block on the next sync pass. 1220e14bb325SJeff Bonwick * 1221e14bb325SJeff Bonwick * In all cases, the gang tree allows complete recovery from partial failure. 1222fa9e4066Sahrens * ========================================================================== 1223fa9e4066Sahrens */ 1224e14bb325SJeff Bonwick 1225e14bb325SJeff Bonwick static zio_t * 1226e14bb325SJeff Bonwick zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1227fa9e4066Sahrens { 1228e14bb325SJeff Bonwick if (gn != NULL) 1229e14bb325SJeff Bonwick return (pio); 1230fa9e4066Sahrens 1231e14bb325SJeff Bonwick return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), 1232e14bb325SJeff Bonwick NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1233e14bb325SJeff Bonwick &pio->io_bookmark)); 1234e14bb325SJeff Bonwick } 1235e14bb325SJeff Bonwick 1236e14bb325SJeff Bonwick zio_t * 1237e14bb325SJeff Bonwick zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1238e14bb325SJeff Bonwick { 1239e14bb325SJeff Bonwick zio_t *zio; 1240e14bb325SJeff Bonwick 1241e14bb325SJeff Bonwick if (gn != NULL) { 1242e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1243e14bb325SJeff Bonwick gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, 1244e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1245fa9e4066Sahrens /* 1246e14bb325SJeff Bonwick * As we rewrite each gang header, the pipeline will compute 1247e14bb325SJeff Bonwick * a new gang block header checksum for it; but no one will 1248e14bb325SJeff Bonwick * compute a new data checksum, so we do that here. The one 1249e14bb325SJeff Bonwick * exception is the gang leader: the pipeline already computed 1250e14bb325SJeff Bonwick * its data checksum because that stage precedes gang assembly. 1251e14bb325SJeff Bonwick * (Presently, nothing actually uses interior data checksums; 1252e14bb325SJeff Bonwick * this is just good hygiene.) 1253fa9e4066Sahrens */ 1254e14bb325SJeff Bonwick if (gn != pio->io_logical->io_gang_tree) { 1255e14bb325SJeff Bonwick zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), 1256e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp)); 1257e14bb325SJeff Bonwick } 1258fa9e4066Sahrens } else { 1259e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1260e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, 1261e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1262fa9e4066Sahrens } 1263fa9e4066Sahrens 1264e14bb325SJeff Bonwick return (zio); 1265e14bb325SJeff Bonwick } 1266fa9e4066Sahrens 1267e14bb325SJeff Bonwick /* ARGSUSED */ 1268e14bb325SJeff Bonwick zio_t * 1269e14bb325SJeff Bonwick zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1270e14bb325SJeff Bonwick { 1271e14bb325SJeff Bonwick return (zio_free(pio, pio->io_spa, pio->io_txg, bp, 1272e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 1273fa9e4066Sahrens } 1274fa9e4066Sahrens 1275e14bb325SJeff Bonwick /* ARGSUSED */ 1276e14bb325SJeff Bonwick zio_t * 1277e14bb325SJeff Bonwick zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1278fa9e4066Sahrens { 1279e14bb325SJeff Bonwick return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, 1280e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 1281e14bb325SJeff Bonwick } 1282fa9e4066Sahrens 1283e14bb325SJeff Bonwick static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { 1284e14bb325SJeff Bonwick NULL, 1285e14bb325SJeff Bonwick zio_read_gang, 1286e14bb325SJeff Bonwick zio_rewrite_gang, 1287e14bb325SJeff Bonwick zio_free_gang, 1288e14bb325SJeff Bonwick zio_claim_gang, 1289e14bb325SJeff Bonwick NULL 1290e14bb325SJeff Bonwick }; 1291fa9e4066Sahrens 1292e14bb325SJeff Bonwick static void zio_gang_tree_assemble_done(zio_t *zio); 1293fa9e4066Sahrens 1294e14bb325SJeff Bonwick static zio_gang_node_t * 1295e14bb325SJeff Bonwick zio_gang_node_alloc(zio_gang_node_t **gnpp) 1296e14bb325SJeff Bonwick { 1297e14bb325SJeff Bonwick zio_gang_node_t *gn; 1298fa9e4066Sahrens 1299e14bb325SJeff Bonwick ASSERT(*gnpp == NULL); 1300fa9e4066Sahrens 1301e14bb325SJeff Bonwick gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); 1302e14bb325SJeff Bonwick gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); 1303e14bb325SJeff Bonwick *gnpp = gn; 1304e14bb325SJeff Bonwick 1305e14bb325SJeff Bonwick return (gn); 1306fa9e4066Sahrens } 1307fa9e4066Sahrens 1308fa9e4066Sahrens static void 1309e14bb325SJeff Bonwick zio_gang_node_free(zio_gang_node_t **gnpp) 1310fa9e4066Sahrens { 1311e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1312fa9e4066Sahrens 1313e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1314e14bb325SJeff Bonwick ASSERT(gn->gn_child[g] == NULL); 1315e14bb325SJeff Bonwick 1316e14bb325SJeff Bonwick zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); 1317e14bb325SJeff Bonwick kmem_free(gn, sizeof (*gn)); 1318e14bb325SJeff Bonwick *gnpp = NULL; 1319fa9e4066Sahrens } 1320fa9e4066Sahrens 1321e14bb325SJeff Bonwick static void 1322e14bb325SJeff Bonwick zio_gang_tree_free(zio_gang_node_t **gnpp) 1323fa9e4066Sahrens { 1324e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1325fa9e4066Sahrens 1326e14bb325SJeff Bonwick if (gn == NULL) 1327e14bb325SJeff Bonwick return; 1328fa9e4066Sahrens 1329e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1330e14bb325SJeff Bonwick zio_gang_tree_free(&gn->gn_child[g]); 1331fa9e4066Sahrens 1332e14bb325SJeff Bonwick zio_gang_node_free(gnpp); 1333fa9e4066Sahrens } 1334fa9e4066Sahrens 1335e14bb325SJeff Bonwick static void 1336e14bb325SJeff Bonwick zio_gang_tree_assemble(zio_t *lio, blkptr_t *bp, zio_gang_node_t **gnpp) 1337fa9e4066Sahrens { 1338e14bb325SJeff Bonwick zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); 1339e14bb325SJeff Bonwick 1340e14bb325SJeff Bonwick ASSERT(lio->io_logical == lio); 1341e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp)); 1342fa9e4066Sahrens 1343e14bb325SJeff Bonwick zio_nowait(zio_read(lio, lio->io_spa, bp, gn->gn_gbh, 1344e14bb325SJeff Bonwick SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, 1345e14bb325SJeff Bonwick lio->io_priority, ZIO_GANG_CHILD_FLAGS(lio), &lio->io_bookmark)); 1346e14bb325SJeff Bonwick } 1347fa9e4066Sahrens 1348e14bb325SJeff Bonwick static void 1349e14bb325SJeff Bonwick zio_gang_tree_assemble_done(zio_t *zio) 1350e14bb325SJeff Bonwick { 1351e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 1352e14bb325SJeff Bonwick zio_gang_node_t *gn = zio->io_private; 1353e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1354fa9e4066Sahrens 1355e14bb325SJeff Bonwick ASSERT(zio->io_parent == lio); 1356e14bb325SJeff Bonwick ASSERT(zio->io_child == NULL); 1357fa9e4066Sahrens 1358e14bb325SJeff Bonwick if (zio->io_error) 1359e14bb325SJeff Bonwick return; 1360fa9e4066Sahrens 1361e14bb325SJeff Bonwick if (BP_SHOULD_BYTESWAP(bp)) 1362e14bb325SJeff Bonwick byteswap_uint64_array(zio->io_data, zio->io_size); 1363fa9e4066Sahrens 1364e14bb325SJeff Bonwick ASSERT(zio->io_data == gn->gn_gbh); 1365e14bb325SJeff Bonwick ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); 1366e14bb325SJeff Bonwick ASSERT(gn->gn_gbh->zg_tail.zbt_magic == ZBT_MAGIC); 1367e05725b1Sbonwick 1368e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1369e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1370e14bb325SJeff Bonwick if (!BP_IS_GANG(gbp)) 1371e14bb325SJeff Bonwick continue; 1372e14bb325SJeff Bonwick zio_gang_tree_assemble(lio, gbp, &gn->gn_child[g]); 1373e14bb325SJeff Bonwick } 1374fa9e4066Sahrens } 1375fa9e4066Sahrens 1376e14bb325SJeff Bonwick static void 1377e14bb325SJeff Bonwick zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) 1378fa9e4066Sahrens { 1379e14bb325SJeff Bonwick zio_t *lio = pio->io_logical; 1380e14bb325SJeff Bonwick zio_t *zio; 1381fa9e4066Sahrens 1382e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) == !!gn); 1383e14bb325SJeff Bonwick ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(lio->io_bp)); 1384e14bb325SJeff Bonwick ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == lio->io_gang_tree); 1385fa9e4066Sahrens 1386e14bb325SJeff Bonwick /* 1387e14bb325SJeff Bonwick * If you're a gang header, your data is in gn->gn_gbh. 1388e14bb325SJeff Bonwick * If you're a gang member, your data is in 'data' and gn == NULL. 1389e14bb325SJeff Bonwick */ 1390e14bb325SJeff Bonwick zio = zio_gang_issue_func[lio->io_type](pio, bp, gn, data); 1391fa9e4066Sahrens 1392e14bb325SJeff Bonwick if (gn != NULL) { 1393e14bb325SJeff Bonwick ASSERT(gn->gn_gbh->zg_tail.zbt_magic == ZBT_MAGIC); 1394fa9e4066Sahrens 1395e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1396e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1397e14bb325SJeff Bonwick if (BP_IS_HOLE(gbp)) 1398e14bb325SJeff Bonwick continue; 1399e14bb325SJeff Bonwick zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); 1400e14bb325SJeff Bonwick data = (char *)data + BP_GET_PSIZE(gbp); 1401e14bb325SJeff Bonwick } 1402fa9e4066Sahrens } 1403fa9e4066Sahrens 1404e14bb325SJeff Bonwick if (gn == lio->io_gang_tree) 1405e14bb325SJeff Bonwick ASSERT3P((char *)lio->io_data + lio->io_size, ==, data); 1406e05725b1Sbonwick 1407e14bb325SJeff Bonwick if (zio != pio) 1408e14bb325SJeff Bonwick zio_nowait(zio); 1409fa9e4066Sahrens } 1410fa9e4066Sahrens 1411e05725b1Sbonwick static int 1412e14bb325SJeff Bonwick zio_gang_assemble(zio_t *zio) 1413fa9e4066Sahrens { 1414e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1415fa9e4066Sahrens 1416e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) && zio == zio->io_logical); 1417fa9e4066Sahrens 1418e14bb325SJeff Bonwick zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); 1419e05725b1Sbonwick 1420e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1421fa9e4066Sahrens } 1422fa9e4066Sahrens 1423e05725b1Sbonwick static int 1424e14bb325SJeff Bonwick zio_gang_issue(zio_t *zio) 1425fa9e4066Sahrens { 1426e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 1427e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1428fa9e4066Sahrens 1429e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) 1430e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1431fa9e4066Sahrens 1432e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) && zio == lio); 1433fa9e4066Sahrens 1434e14bb325SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_GANG] == 0) 1435e14bb325SJeff Bonwick zio_gang_tree_issue(lio, lio->io_gang_tree, bp, lio->io_data); 1436e14bb325SJeff Bonwick else 1437e14bb325SJeff Bonwick zio_gang_tree_free(&lio->io_gang_tree); 1438fa9e4066Sahrens 1439e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1440e05725b1Sbonwick 1441e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1442fa9e4066Sahrens } 1443fa9e4066Sahrens 1444fa9e4066Sahrens static void 1445e14bb325SJeff Bonwick zio_write_gang_member_ready(zio_t *zio) 1446fa9e4066Sahrens { 1447fa9e4066Sahrens zio_t *pio = zio->io_parent; 1448e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 144944cd46caSbillm dva_t *cdva = zio->io_bp->blk_dva; 145044cd46caSbillm dva_t *pdva = pio->io_bp->blk_dva; 1451fa9e4066Sahrens uint64_t asize; 1452fa9e4066Sahrens 1453e14bb325SJeff Bonwick if (BP_IS_HOLE(zio->io_bp)) 1454e14bb325SJeff Bonwick return; 1455e14bb325SJeff Bonwick 1456e14bb325SJeff Bonwick ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); 1457e14bb325SJeff Bonwick 1458e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_GANG); 1459e14bb325SJeff Bonwick ASSERT3U(zio->io_prop.zp_ndvas, ==, lio->io_prop.zp_ndvas); 1460e14bb325SJeff Bonwick ASSERT3U(zio->io_prop.zp_ndvas, <=, BP_GET_NDVAS(zio->io_bp)); 1461e14bb325SJeff Bonwick ASSERT3U(pio->io_prop.zp_ndvas, <=, BP_GET_NDVAS(pio->io_bp)); 146244cd46caSbillm ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); 1463fa9e4066Sahrens 1464fa9e4066Sahrens mutex_enter(&pio->io_lock); 1465e14bb325SJeff Bonwick for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { 146644cd46caSbillm ASSERT(DVA_GET_GANG(&pdva[d])); 146744cd46caSbillm asize = DVA_GET_ASIZE(&pdva[d]); 146844cd46caSbillm asize += DVA_GET_ASIZE(&cdva[d]); 146944cd46caSbillm DVA_SET_ASIZE(&pdva[d], asize); 147044cd46caSbillm } 1471fa9e4066Sahrens mutex_exit(&pio->io_lock); 1472fa9e4066Sahrens } 1473fa9e4066Sahrens 14740a4e9518Sgw static int 1475e14bb325SJeff Bonwick zio_write_gang_block(zio_t *pio) 1476fa9e4066Sahrens { 1477e14bb325SJeff Bonwick spa_t *spa = pio->io_spa; 1478e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 1479e14bb325SJeff Bonwick zio_t *lio = pio->io_logical; 1480e14bb325SJeff Bonwick zio_t *zio; 1481e14bb325SJeff Bonwick zio_gang_node_t *gn, **gnpp; 1482fa9e4066Sahrens zio_gbh_phys_t *gbh; 1483e14bb325SJeff Bonwick uint64_t txg = pio->io_txg; 1484e14bb325SJeff Bonwick uint64_t resid = pio->io_size; 1485e14bb325SJeff Bonwick uint64_t lsize; 1486e14bb325SJeff Bonwick int ndvas = lio->io_prop.zp_ndvas; 148744cd46caSbillm int gbh_ndvas = MIN(ndvas + 1, spa_max_replication(spa)); 1488e14bb325SJeff Bonwick zio_prop_t zp; 1489fa9e4066Sahrens int error; 1490fa9e4066Sahrens 1491e14bb325SJeff Bonwick error = metaslab_alloc(spa, spa->spa_normal_class, SPA_GANGBLOCKSIZE, 1492e14bb325SJeff Bonwick bp, gbh_ndvas, txg, pio == lio ? NULL : lio->io_bp, 1493e14bb325SJeff Bonwick METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); 1494e05725b1Sbonwick if (error) { 1495e14bb325SJeff Bonwick pio->io_error = error; 1496e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1497e05725b1Sbonwick } 1498fa9e4066Sahrens 1499e14bb325SJeff Bonwick if (pio == lio) { 1500e14bb325SJeff Bonwick gnpp = &lio->io_gang_tree; 1501e14bb325SJeff Bonwick } else { 1502e14bb325SJeff Bonwick gnpp = pio->io_private; 1503e14bb325SJeff Bonwick ASSERT(pio->io_ready == zio_write_gang_member_ready); 1504fa9e4066Sahrens } 1505fa9e4066Sahrens 1506e14bb325SJeff Bonwick gn = zio_gang_node_alloc(gnpp); 1507e14bb325SJeff Bonwick gbh = gn->gn_gbh; 1508e14bb325SJeff Bonwick bzero(gbh, SPA_GANGBLOCKSIZE); 1509fa9e4066Sahrens 1510e14bb325SJeff Bonwick /* 1511e14bb325SJeff Bonwick * Create the gang header. 1512e14bb325SJeff Bonwick */ 1513e14bb325SJeff Bonwick zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, 1514e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1515fa9e4066Sahrens 1516e14bb325SJeff Bonwick /* 1517e14bb325SJeff Bonwick * Create and nowait the gang children. 1518e14bb325SJeff Bonwick */ 1519e14bb325SJeff Bonwick for (int g = 0; resid != 0; resid -= lsize, g++) { 1520e14bb325SJeff Bonwick lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), 1521e14bb325SJeff Bonwick SPA_MINBLOCKSIZE); 1522e14bb325SJeff Bonwick ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); 1523e14bb325SJeff Bonwick 1524e14bb325SJeff Bonwick zp.zp_checksum = lio->io_prop.zp_checksum; 1525e14bb325SJeff Bonwick zp.zp_compress = ZIO_COMPRESS_OFF; 1526e14bb325SJeff Bonwick zp.zp_type = DMU_OT_NONE; 1527e14bb325SJeff Bonwick zp.zp_level = 0; 1528e14bb325SJeff Bonwick zp.zp_ndvas = lio->io_prop.zp_ndvas; 1529e14bb325SJeff Bonwick 1530e14bb325SJeff Bonwick zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], 1531e14bb325SJeff Bonwick (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, 1532e14bb325SJeff Bonwick zio_write_gang_member_ready, NULL, &gn->gn_child[g], 1533e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1534e14bb325SJeff Bonwick &pio->io_bookmark)); 1535e14bb325SJeff Bonwick } 1536e05725b1Sbonwick 153744cd46caSbillm /* 1538e14bb325SJeff Bonwick * Set pio's pipeline to just wait for zio to finish. 153944cd46caSbillm */ 1540e14bb325SJeff Bonwick pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1541e14bb325SJeff Bonwick 1542e14bb325SJeff Bonwick zio_nowait(zio); 1543e14bb325SJeff Bonwick 1544e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1545fa9e4066Sahrens } 1546fa9e4066Sahrens 1547fa9e4066Sahrens /* 1548fa9e4066Sahrens * ========================================================================== 1549fa9e4066Sahrens * Allocate and free blocks 1550fa9e4066Sahrens * ========================================================================== 1551fa9e4066Sahrens */ 1552e14bb325SJeff Bonwick 1553e05725b1Sbonwick static int 1554fa9e4066Sahrens zio_dva_allocate(zio_t *zio) 1555fa9e4066Sahrens { 15568654d025Sperrin spa_t *spa = zio->io_spa; 15578654d025Sperrin metaslab_class_t *mc = spa->spa_normal_class; 1558fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 1559fa9e4066Sahrens int error; 1560fa9e4066Sahrens 1561fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 156244cd46caSbillm ASSERT3U(BP_GET_NDVAS(bp), ==, 0); 1563e14bb325SJeff Bonwick ASSERT3U(zio->io_prop.zp_ndvas, >, 0); 1564e14bb325SJeff Bonwick ASSERT3U(zio->io_prop.zp_ndvas, <=, spa_max_replication(spa)); 1565fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 1566fa9e4066Sahrens 1567e14bb325SJeff Bonwick error = metaslab_alloc(spa, mc, zio->io_size, bp, 1568e14bb325SJeff Bonwick zio->io_prop.zp_ndvas, zio->io_txg, NULL, 0); 1569fa9e4066Sahrens 1570e14bb325SJeff Bonwick if (error) { 1571e14bb325SJeff Bonwick if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) 1572e14bb325SJeff Bonwick return (zio_write_gang_block(zio)); 1573fa9e4066Sahrens zio->io_error = error; 1574fa9e4066Sahrens } 1575e05725b1Sbonwick 1576e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1577fa9e4066Sahrens } 1578fa9e4066Sahrens 1579e05725b1Sbonwick static int 1580fa9e4066Sahrens zio_dva_free(zio_t *zio) 1581fa9e4066Sahrens { 1582e14bb325SJeff Bonwick metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); 1583fa9e4066Sahrens 1584e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1585fa9e4066Sahrens } 1586fa9e4066Sahrens 1587e05725b1Sbonwick static int 1588fa9e4066Sahrens zio_dva_claim(zio_t *zio) 1589fa9e4066Sahrens { 1590e14bb325SJeff Bonwick int error; 1591e14bb325SJeff Bonwick 1592e14bb325SJeff Bonwick error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); 1593e14bb325SJeff Bonwick if (error) 1594e14bb325SJeff Bonwick zio->io_error = error; 1595fa9e4066Sahrens 1596e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1597fa9e4066Sahrens } 1598fa9e4066Sahrens 1599e14bb325SJeff Bonwick /* 1600e14bb325SJeff Bonwick * Undo an allocation. This is used by zio_done() when an I/O fails 1601e14bb325SJeff Bonwick * and we want to give back the block we just allocated. 1602e14bb325SJeff Bonwick * This handles both normal blocks and gang blocks. 1603e14bb325SJeff Bonwick */ 1604e14bb325SJeff Bonwick static void 1605e14bb325SJeff Bonwick zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) 1606e14bb325SJeff Bonwick { 1607e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 1608e14bb325SJeff Bonwick boolean_t now = !(zio->io_flags & ZIO_FLAG_IO_REWRITE); 1609e14bb325SJeff Bonwick 1610e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 1611e14bb325SJeff Bonwick 1612e14bb325SJeff Bonwick if (zio->io_bp == bp && !now) { 1613e14bb325SJeff Bonwick /* 1614e14bb325SJeff Bonwick * This is a rewrite for sync-to-convergence. 1615e14bb325SJeff Bonwick * We can't do a metaslab_free(NOW) because bp wasn't allocated 1616e14bb325SJeff Bonwick * during this sync pass, which means that metaslab_sync() 1617e14bb325SJeff Bonwick * already committed the allocation. 1618e14bb325SJeff Bonwick */ 1619e14bb325SJeff Bonwick ASSERT(DVA_EQUAL(BP_IDENTITY(bp), 1620e14bb325SJeff Bonwick BP_IDENTITY(&zio->io_bp_orig))); 1621e14bb325SJeff Bonwick ASSERT(spa_sync_pass(spa) > 1); 1622e14bb325SJeff Bonwick 1623e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && gn == NULL) { 1624e14bb325SJeff Bonwick /* 1625e14bb325SJeff Bonwick * This is a gang leader whose gang header(s) we 1626e14bb325SJeff Bonwick * couldn't read now, so defer the free until later. 1627e14bb325SJeff Bonwick * The block should still be intact because without 1628e14bb325SJeff Bonwick * the headers, we'd never even start the rewrite. 1629e14bb325SJeff Bonwick */ 1630e14bb325SJeff Bonwick bplist_enqueue_deferred(&spa->spa_sync_bplist, bp); 1631e14bb325SJeff Bonwick return; 1632e14bb325SJeff Bonwick } 1633e14bb325SJeff Bonwick } 1634e14bb325SJeff Bonwick 1635e14bb325SJeff Bonwick if (!BP_IS_HOLE(bp)) 1636e14bb325SJeff Bonwick metaslab_free(spa, bp, bp->blk_birth, now); 1637e14bb325SJeff Bonwick 1638e14bb325SJeff Bonwick if (gn != NULL) { 1639e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1640e14bb325SJeff Bonwick zio_dva_unallocate(zio, gn->gn_child[g], 1641e14bb325SJeff Bonwick &gn->gn_gbh->zg_blkptr[g]); 1642e14bb325SJeff Bonwick } 1643e14bb325SJeff Bonwick } 1644e14bb325SJeff Bonwick } 1645e14bb325SJeff Bonwick 1646e14bb325SJeff Bonwick /* 1647e14bb325SJeff Bonwick * Try to allocate an intent log block. Return 0 on success, errno on failure. 1648e14bb325SJeff Bonwick */ 1649e14bb325SJeff Bonwick int 1650e14bb325SJeff Bonwick zio_alloc_blk(spa_t *spa, uint64_t size, blkptr_t *new_bp, blkptr_t *old_bp, 1651e14bb325SJeff Bonwick uint64_t txg) 1652e14bb325SJeff Bonwick { 1653e14bb325SJeff Bonwick int error; 1654e14bb325SJeff Bonwick 1655e14bb325SJeff Bonwick error = metaslab_alloc(spa, spa->spa_log_class, size, 1656e14bb325SJeff Bonwick new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); 1657e14bb325SJeff Bonwick 1658e14bb325SJeff Bonwick if (error) 1659e14bb325SJeff Bonwick error = metaslab_alloc(spa, spa->spa_normal_class, size, 1660e14bb325SJeff Bonwick new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID); 1661e14bb325SJeff Bonwick 1662e14bb325SJeff Bonwick if (error == 0) { 1663e14bb325SJeff Bonwick BP_SET_LSIZE(new_bp, size); 1664e14bb325SJeff Bonwick BP_SET_PSIZE(new_bp, size); 1665e14bb325SJeff Bonwick BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); 1666e14bb325SJeff Bonwick BP_SET_CHECKSUM(new_bp, ZIO_CHECKSUM_ZILOG); 1667e14bb325SJeff Bonwick BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 1668e14bb325SJeff Bonwick BP_SET_LEVEL(new_bp, 0); 1669e14bb325SJeff Bonwick BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); 1670e14bb325SJeff Bonwick } 1671e14bb325SJeff Bonwick 1672e14bb325SJeff Bonwick return (error); 1673e14bb325SJeff Bonwick } 1674e14bb325SJeff Bonwick 1675e14bb325SJeff Bonwick /* 1676e14bb325SJeff Bonwick * Free an intent log block. We know it can't be a gang block, so there's 1677e14bb325SJeff Bonwick * nothing to do except metaslab_free() it. 1678e14bb325SJeff Bonwick */ 1679e14bb325SJeff Bonwick void 1680e14bb325SJeff Bonwick zio_free_blk(spa_t *spa, blkptr_t *bp, uint64_t txg) 1681e14bb325SJeff Bonwick { 1682e14bb325SJeff Bonwick ASSERT(!BP_IS_GANG(bp)); 1683e14bb325SJeff Bonwick 1684e14bb325SJeff Bonwick metaslab_free(spa, bp, txg, B_FALSE); 1685e14bb325SJeff Bonwick } 1686e14bb325SJeff Bonwick 1687fa9e4066Sahrens /* 1688fa9e4066Sahrens * ========================================================================== 1689fa9e4066Sahrens * Read and write to physical devices 1690fa9e4066Sahrens * ========================================================================== 1691fa9e4066Sahrens */ 1692fa9e4066Sahrens 1693e14bb325SJeff Bonwick static void 1694e14bb325SJeff Bonwick zio_vdev_io_probe_done(zio_t *zio) 1695e14bb325SJeff Bonwick { 1696e14bb325SJeff Bonwick zio_t *dio; 1697e14bb325SJeff Bonwick vdev_t *vd = zio->io_private; 1698e14bb325SJeff Bonwick 1699e14bb325SJeff Bonwick mutex_enter(&vd->vdev_probe_lock); 1700e14bb325SJeff Bonwick ASSERT(vd->vdev_probe_zio == zio); 1701e14bb325SJeff Bonwick vd->vdev_probe_zio = NULL; 1702e14bb325SJeff Bonwick mutex_exit(&vd->vdev_probe_lock); 1703e14bb325SJeff Bonwick 1704e14bb325SJeff Bonwick while ((dio = zio->io_delegate_list) != NULL) { 1705e14bb325SJeff Bonwick zio->io_delegate_list = dio->io_delegate_next; 1706e14bb325SJeff Bonwick dio->io_delegate_next = NULL; 1707e14bb325SJeff Bonwick if (!vdev_accessible(vd, dio)) 1708e14bb325SJeff Bonwick dio->io_error = ENXIO; 1709e14bb325SJeff Bonwick zio_execute(dio); 1710e14bb325SJeff Bonwick } 1711e14bb325SJeff Bonwick } 1712e14bb325SJeff Bonwick 1713e14bb325SJeff Bonwick /* 1714e14bb325SJeff Bonwick * Probe the device to determine whether I/O failure is specific to this 1715e14bb325SJeff Bonwick * zio (e.g. a bad sector) or affects the entire vdev (e.g. unplugged). 1716e14bb325SJeff Bonwick */ 1717e14bb325SJeff Bonwick static int 1718e14bb325SJeff Bonwick zio_vdev_io_probe(zio_t *zio) 1719e14bb325SJeff Bonwick { 1720e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 1721e14bb325SJeff Bonwick zio_t *pio = NULL; 1722e14bb325SJeff Bonwick boolean_t created_pio = B_FALSE; 1723e14bb325SJeff Bonwick 1724e14bb325SJeff Bonwick /* 1725e14bb325SJeff Bonwick * Don't probe the probe. 1726e14bb325SJeff Bonwick */ 1727e14bb325SJeff Bonwick if (zio->io_flags & ZIO_FLAG_PROBE) 1728e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1729e14bb325SJeff Bonwick 1730e14bb325SJeff Bonwick /* 1731e14bb325SJeff Bonwick * To prevent 'probe storms' when a device fails, we create 1732e14bb325SJeff Bonwick * just one probe i/o at a time. All zios that want to probe 1733e14bb325SJeff Bonwick * this vdev will join the probe zio's io_delegate_list. 1734e14bb325SJeff Bonwick */ 1735e14bb325SJeff Bonwick mutex_enter(&vd->vdev_probe_lock); 1736e14bb325SJeff Bonwick 1737e14bb325SJeff Bonwick if ((pio = vd->vdev_probe_zio) == NULL) { 1738e14bb325SJeff Bonwick vd->vdev_probe_zio = pio = zio_root(zio->io_spa, 1739e14bb325SJeff Bonwick zio_vdev_io_probe_done, vd, ZIO_FLAG_CANFAIL); 1740e14bb325SJeff Bonwick created_pio = B_TRUE; 1741e14bb325SJeff Bonwick vd->vdev_probe_wanted = B_TRUE; 1742e14bb325SJeff Bonwick spa_async_request(zio->io_spa, SPA_ASYNC_PROBE); 1743e14bb325SJeff Bonwick } 1744e14bb325SJeff Bonwick 1745e14bb325SJeff Bonwick zio->io_delegate_next = pio->io_delegate_list; 1746e14bb325SJeff Bonwick pio->io_delegate_list = zio; 1747e14bb325SJeff Bonwick 1748e14bb325SJeff Bonwick mutex_exit(&vd->vdev_probe_lock); 1749e14bb325SJeff Bonwick 1750e14bb325SJeff Bonwick if (created_pio) { 1751e14bb325SJeff Bonwick zio_nowait(vdev_probe(vd, pio)); 1752e14bb325SJeff Bonwick zio_nowait(pio); 1753e14bb325SJeff Bonwick } 1754e14bb325SJeff Bonwick 1755e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1756e14bb325SJeff Bonwick } 1757e14bb325SJeff Bonwick 1758e05725b1Sbonwick static int 175944cd46caSbillm zio_vdev_io_start(zio_t *zio) 1760fa9e4066Sahrens { 1761fa9e4066Sahrens vdev_t *vd = zio->io_vd; 176244cd46caSbillm uint64_t align; 17630a4e9518Sgw spa_t *spa = zio->io_spa; 17640a4e9518Sgw 1765e14bb325SJeff Bonwick ASSERT(zio->io_error == 0); 1766e14bb325SJeff Bonwick ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); 1767fa9e4066Sahrens 1768e14bb325SJeff Bonwick if (vd == NULL) { 1769e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 1770e14bb325SJeff Bonwick spa_config_enter(spa, SCL_ZIO, zio, RW_READER); 1771fa9e4066Sahrens 1772e14bb325SJeff Bonwick /* 1773e14bb325SJeff Bonwick * The mirror_ops handle multiple DVAs in a single BP. 1774e14bb325SJeff Bonwick */ 1775e14bb325SJeff Bonwick return (vdev_mirror_ops.vdev_op_io_start(zio)); 1776fa9e4066Sahrens } 1777fa9e4066Sahrens 1778e14bb325SJeff Bonwick align = 1ULL << vd->vdev_top->vdev_ashift; 1779e14bb325SJeff Bonwick 1780ecc2d604Sbonwick if (P2PHASE(zio->io_size, align) != 0) { 1781ecc2d604Sbonwick uint64_t asize = P2ROUNDUP(zio->io_size, align); 1782ecc2d604Sbonwick char *abuf = zio_buf_alloc(asize); 1783e14bb325SJeff Bonwick ASSERT(vd == vd->vdev_top); 1784ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_WRITE) { 1785ecc2d604Sbonwick bcopy(zio->io_data, abuf, zio->io_size); 1786ecc2d604Sbonwick bzero(abuf + zio->io_size, asize - zio->io_size); 1787ecc2d604Sbonwick } 1788e14bb325SJeff Bonwick zio_push_transform(zio, abuf, asize, asize, zio_subblock); 1789ecc2d604Sbonwick } 1790ecc2d604Sbonwick 1791ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_offset, align) == 0); 1792ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_size, align) == 0); 1793*8ad4d6ddSJeff Bonwick ASSERT(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); 1794*8ad4d6ddSJeff Bonwick 1795*8ad4d6ddSJeff Bonwick /* 1796*8ad4d6ddSJeff Bonwick * If this is a repair I/O, and there's no self-healing involved -- 1797*8ad4d6ddSJeff Bonwick * that is, we're just resilvering what we expect to resilver -- 1798*8ad4d6ddSJeff Bonwick * then don't do the I/O unless zio's txg is actually in vd's DTL. 1799*8ad4d6ddSJeff Bonwick * This prevents spurious resilvering with nested replication. 1800*8ad4d6ddSJeff Bonwick * For example, given a mirror of mirrors, (A+B)+(C+D), if only 1801*8ad4d6ddSJeff Bonwick * A is out of date, we'll read from C+D, then use the data to 1802*8ad4d6ddSJeff Bonwick * resilver A+B -- but we don't actually want to resilver B, just A. 1803*8ad4d6ddSJeff Bonwick * The top-level mirror has no way to know this, so instead we just 1804*8ad4d6ddSJeff Bonwick * discard unnecessary repairs as we work our way down the vdev tree. 1805*8ad4d6ddSJeff Bonwick * The same logic applies to any form of nested replication: 1806*8ad4d6ddSJeff Bonwick * ditto + mirror, RAID-Z + replacing, etc. This covers them all. 1807*8ad4d6ddSJeff Bonwick */ 1808*8ad4d6ddSJeff Bonwick if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && 1809*8ad4d6ddSJeff Bonwick !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && 1810*8ad4d6ddSJeff Bonwick zio->io_txg != 0 && /* not a delegated i/o */ 1811*8ad4d6ddSJeff Bonwick !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { 1812*8ad4d6ddSJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 1813*8ad4d6ddSJeff Bonwick ASSERT(zio->io_delegate_list == NULL); 1814*8ad4d6ddSJeff Bonwick zio_vdev_io_bypass(zio); 1815*8ad4d6ddSJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1816*8ad4d6ddSJeff Bonwick } 1817fa9e4066Sahrens 1818e14bb325SJeff Bonwick if (vd->vdev_ops->vdev_op_leaf && 1819e14bb325SJeff Bonwick (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { 1820e14bb325SJeff Bonwick 1821e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) 1822e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1823e14bb325SJeff Bonwick 1824e14bb325SJeff Bonwick if ((zio = vdev_queue_io(zio)) == NULL) 1825e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1826e14bb325SJeff Bonwick 1827e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 1828e14bb325SJeff Bonwick zio->io_error = ENXIO; 1829e14bb325SJeff Bonwick zio_interrupt(zio); 1830e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1831e14bb325SJeff Bonwick } 1832e14bb325SJeff Bonwick } 1833e14bb325SJeff Bonwick 1834e05725b1Sbonwick return (vd->vdev_ops->vdev_op_io_start(zio)); 1835fa9e4066Sahrens } 1836fa9e4066Sahrens 1837e05725b1Sbonwick static int 1838fa9e4066Sahrens zio_vdev_io_done(zio_t *zio) 1839fa9e4066Sahrens { 1840e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 1841e14bb325SJeff Bonwick vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; 1842e14bb325SJeff Bonwick boolean_t unexpected_error = B_FALSE; 1843e05725b1Sbonwick 1844e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 1845e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1846fa9e4066Sahrens 1847e14bb325SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); 1848e14bb325SJeff Bonwick 1849e14bb325SJeff Bonwick if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { 1850e14bb325SJeff Bonwick 1851e14bb325SJeff Bonwick vdev_queue_io_done(zio); 1852fa9e4066Sahrens 1853e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE) 1854e14bb325SJeff Bonwick vdev_cache_write(zio); 1855e14bb325SJeff Bonwick 1856e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 1857e14bb325SJeff Bonwick zio->io_error = zio_handle_device_injection(vd, EIO); 1858e14bb325SJeff Bonwick 1859e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 1860e14bb325SJeff Bonwick zio->io_error = zio_handle_label_injection(zio, EIO); 1861e14bb325SJeff Bonwick 1862e14bb325SJeff Bonwick if (zio->io_error) { 1863e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 1864e14bb325SJeff Bonwick zio->io_error = ENXIO; 1865e14bb325SJeff Bonwick } else { 1866e14bb325SJeff Bonwick unexpected_error = B_TRUE; 1867e14bb325SJeff Bonwick } 1868e14bb325SJeff Bonwick } 186951ece835Seschrock } 1870fa9e4066Sahrens 1871e14bb325SJeff Bonwick ops->vdev_op_io_done(zio); 1872e14bb325SJeff Bonwick 1873e14bb325SJeff Bonwick if (unexpected_error) 1874e14bb325SJeff Bonwick return (zio_vdev_io_probe(zio)); 1875e14bb325SJeff Bonwick 1876e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1877fa9e4066Sahrens } 1878fa9e4066Sahrens 1879e05725b1Sbonwick static int 1880fa9e4066Sahrens zio_vdev_io_assess(zio_t *zio) 1881fa9e4066Sahrens { 1882fa9e4066Sahrens vdev_t *vd = zio->io_vd; 1883e14bb325SJeff Bonwick 1884e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 1885e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1886e14bb325SJeff Bonwick 1887e14bb325SJeff Bonwick if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 1888e14bb325SJeff Bonwick spa_config_exit(zio->io_spa, SCL_ZIO, zio); 1889e14bb325SJeff Bonwick 1890e14bb325SJeff Bonwick if (zio->io_vsd != NULL) { 1891e14bb325SJeff Bonwick zio->io_vsd_free(zio); 1892e14bb325SJeff Bonwick zio->io_vsd = NULL; 1893ecc2d604Sbonwick } 1894ecc2d604Sbonwick 1895e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 1896ea8dc4b6Seschrock zio->io_error = zio_handle_fault_injection(zio, EIO); 1897ea8dc4b6Seschrock 1898fa9e4066Sahrens /* 1899fa9e4066Sahrens * If the I/O failed, determine whether we should attempt to retry it. 1900fa9e4066Sahrens */ 1901e14bb325SJeff Bonwick if (zio->io_error && vd == NULL && 1902e14bb325SJeff Bonwick !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { 1903e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ 1904e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ 1905fa9e4066Sahrens zio->io_error = 0; 1906e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_RETRY | 1907e14bb325SJeff Bonwick ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; 190844cd46caSbillm zio->io_stage = ZIO_STAGE_VDEV_IO_START - 1; 1909e14bb325SJeff Bonwick zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE); 1910e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1911ea8dc4b6Seschrock } 1912fa9e4066Sahrens 1913e14bb325SJeff Bonwick /* 1914e14bb325SJeff Bonwick * If we got an error on a leaf device, convert it to ENXIO 1915e14bb325SJeff Bonwick * if the device is not accessible at all. 1916e14bb325SJeff Bonwick */ 1917e14bb325SJeff Bonwick if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && 1918e14bb325SJeff Bonwick !vdev_accessible(vd, zio)) 1919e14bb325SJeff Bonwick zio->io_error = ENXIO; 1920e14bb325SJeff Bonwick 1921e14bb325SJeff Bonwick /* 1922e14bb325SJeff Bonwick * If we can't write to an interior vdev (mirror or RAID-Z), 1923e14bb325SJeff Bonwick * set vdev_cant_write so that we stop trying to allocate from it. 1924e14bb325SJeff Bonwick */ 1925e14bb325SJeff Bonwick if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && 1926e14bb325SJeff Bonwick vd != NULL && !vd->vdev_ops->vdev_op_leaf) 1927e14bb325SJeff Bonwick vd->vdev_cant_write = B_TRUE; 1928e14bb325SJeff Bonwick 1929e14bb325SJeff Bonwick if (zio->io_error) 1930e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1931e14bb325SJeff Bonwick 1932e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1933fa9e4066Sahrens } 1934fa9e4066Sahrens 1935fa9e4066Sahrens void 1936fa9e4066Sahrens zio_vdev_io_reissue(zio_t *zio) 1937fa9e4066Sahrens { 1938fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 1939fa9e4066Sahrens ASSERT(zio->io_error == 0); 1940fa9e4066Sahrens 1941fa9e4066Sahrens zio->io_stage--; 1942fa9e4066Sahrens } 1943fa9e4066Sahrens 1944fa9e4066Sahrens void 1945fa9e4066Sahrens zio_vdev_io_redone(zio_t *zio) 1946fa9e4066Sahrens { 1947fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); 1948fa9e4066Sahrens 1949fa9e4066Sahrens zio->io_stage--; 1950fa9e4066Sahrens } 1951fa9e4066Sahrens 1952fa9e4066Sahrens void 1953fa9e4066Sahrens zio_vdev_io_bypass(zio_t *zio) 1954fa9e4066Sahrens { 1955fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 1956fa9e4066Sahrens ASSERT(zio->io_error == 0); 1957fa9e4066Sahrens 1958fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_IO_BYPASS; 1959fa9e4066Sahrens zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS - 1; 1960fa9e4066Sahrens } 1961fa9e4066Sahrens 1962fa9e4066Sahrens /* 1963fa9e4066Sahrens * ========================================================================== 1964fa9e4066Sahrens * Generate and verify checksums 1965fa9e4066Sahrens * ========================================================================== 1966fa9e4066Sahrens */ 1967e05725b1Sbonwick static int 1968fa9e4066Sahrens zio_checksum_generate(zio_t *zio) 1969fa9e4066Sahrens { 1970fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 1971e14bb325SJeff Bonwick enum zio_checksum checksum; 1972fa9e4066Sahrens 1973e14bb325SJeff Bonwick if (bp == NULL) { 1974e14bb325SJeff Bonwick /* 1975e14bb325SJeff Bonwick * This is zio_write_phys(). 1976e14bb325SJeff Bonwick * We're either generating a label checksum, or none at all. 1977e14bb325SJeff Bonwick */ 1978e14bb325SJeff Bonwick checksum = zio->io_prop.zp_checksum; 1979e14bb325SJeff Bonwick 1980e14bb325SJeff Bonwick if (checksum == ZIO_CHECKSUM_OFF) 1981e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1982fa9e4066Sahrens 1983e14bb325SJeff Bonwick ASSERT(checksum == ZIO_CHECKSUM_LABEL); 1984e14bb325SJeff Bonwick } else { 1985e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { 1986e14bb325SJeff Bonwick ASSERT(!IO_IS_ALLOCATING(zio)); 1987e14bb325SJeff Bonwick checksum = ZIO_CHECKSUM_GANG_HEADER; 1988e14bb325SJeff Bonwick } else { 1989e14bb325SJeff Bonwick checksum = BP_GET_CHECKSUM(bp); 1990e14bb325SJeff Bonwick } 1991e14bb325SJeff Bonwick } 1992fa9e4066Sahrens 1993e14bb325SJeff Bonwick zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); 1994fa9e4066Sahrens 1995e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1996fa9e4066Sahrens } 1997fa9e4066Sahrens 1998e05725b1Sbonwick static int 1999e14bb325SJeff Bonwick zio_checksum_verify(zio_t *zio) 2000fa9e4066Sahrens { 2001e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2002e14bb325SJeff Bonwick int error; 2003fa9e4066Sahrens 2004e14bb325SJeff Bonwick if (bp == NULL) { 2005e14bb325SJeff Bonwick /* 2006e14bb325SJeff Bonwick * This is zio_read_phys(). 2007e14bb325SJeff Bonwick * We're either verifying a label checksum, or nothing at all. 2008e14bb325SJeff Bonwick */ 2009e14bb325SJeff Bonwick if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) 2010e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2011fa9e4066Sahrens 2012e14bb325SJeff Bonwick ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); 2013e14bb325SJeff Bonwick } 2014fa9e4066Sahrens 2015e14bb325SJeff Bonwick if ((error = zio_checksum_error(zio)) != 0) { 2016e14bb325SJeff Bonwick zio->io_error = error; 2017e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { 2018ea8dc4b6Seschrock zfs_ereport_post(FM_EREPORT_ZFS_CHECKSUM, 2019ea8dc4b6Seschrock zio->io_spa, zio->io_vd, zio, 0, 0); 2020e14bb325SJeff Bonwick } 2021fa9e4066Sahrens } 2022fa9e4066Sahrens 2023e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2024fa9e4066Sahrens } 2025fa9e4066Sahrens 2026fa9e4066Sahrens /* 2027fa9e4066Sahrens * Called by RAID-Z to ensure we don't compute the checksum twice. 2028fa9e4066Sahrens */ 2029fa9e4066Sahrens void 2030fa9e4066Sahrens zio_checksum_verified(zio_t *zio) 2031fa9e4066Sahrens { 2032fa9e4066Sahrens zio->io_pipeline &= ~(1U << ZIO_STAGE_CHECKSUM_VERIFY); 2033fa9e4066Sahrens } 2034fa9e4066Sahrens 2035fa9e4066Sahrens /* 2036e14bb325SJeff Bonwick * ========================================================================== 2037e14bb325SJeff Bonwick * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. 2038e14bb325SJeff Bonwick * An error of 0 indictes success. ENXIO indicates whole-device failure, 2039e14bb325SJeff Bonwick * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO 2040e14bb325SJeff Bonwick * indicate errors that are specific to one I/O, and most likely permanent. 2041e14bb325SJeff Bonwick * Any other error is presumed to be worse because we weren't expecting it. 2042e14bb325SJeff Bonwick * ========================================================================== 2043fa9e4066Sahrens */ 2044e14bb325SJeff Bonwick int 2045e14bb325SJeff Bonwick zio_worst_error(int e1, int e2) 2046fa9e4066Sahrens { 2047e14bb325SJeff Bonwick static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; 2048e14bb325SJeff Bonwick int r1, r2; 2049e14bb325SJeff Bonwick 2050e14bb325SJeff Bonwick for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) 2051e14bb325SJeff Bonwick if (e1 == zio_error_rank[r1]) 2052e14bb325SJeff Bonwick break; 2053e14bb325SJeff Bonwick 2054e14bb325SJeff Bonwick for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) 2055e14bb325SJeff Bonwick if (e2 == zio_error_rank[r2]) 2056e14bb325SJeff Bonwick break; 205744cd46caSbillm 2058e14bb325SJeff Bonwick return (r1 > r2 ? e1 : e2); 2059fa9e4066Sahrens } 2060fa9e4066Sahrens 2061fa9e4066Sahrens /* 2062fa9e4066Sahrens * ========================================================================== 2063e14bb325SJeff Bonwick * I/O completion 2064fa9e4066Sahrens * ========================================================================== 2065fa9e4066Sahrens */ 2066e14bb325SJeff Bonwick static int 2067e14bb325SJeff Bonwick zio_ready(zio_t *zio) 2068fa9e4066Sahrens { 2069e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2070e14bb325SJeff Bonwick zio_t *pio = zio->io_parent; 2071fa9e4066Sahrens 2072e14bb325SJeff Bonwick if (zio->io_ready) { 2073e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && 2074e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY)) 2075e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2076fa9e4066Sahrens 2077e14bb325SJeff Bonwick ASSERT(IO_IS_ALLOCATING(zio)); 2078e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2079e14bb325SJeff Bonwick ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); 2080fa9e4066Sahrens 2081e14bb325SJeff Bonwick zio->io_ready(zio); 2082e14bb325SJeff Bonwick } 2083fa9e4066Sahrens 2084e14bb325SJeff Bonwick if (bp != NULL && bp != &zio->io_bp_copy) 2085e14bb325SJeff Bonwick zio->io_bp_copy = *bp; 2086fa9e4066Sahrens 2087e14bb325SJeff Bonwick if (zio->io_error) 2088e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2089fa9e4066Sahrens 2090e14bb325SJeff Bonwick if (pio != NULL) 2091e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_READY); 2092fa9e4066Sahrens 2093e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2094fa9e4066Sahrens } 2095fa9e4066Sahrens 2096e14bb325SJeff Bonwick static int 2097e14bb325SJeff Bonwick zio_done(zio_t *zio) 2098d63d470bSgw { 2099e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 2100e14bb325SJeff Bonwick zio_t *pio = zio->io_parent; 2101e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 2102e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2103e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2104e14bb325SJeff Bonwick uint64_t psize = zio->io_size; 2105d63d470bSgw 2106e14bb325SJeff Bonwick /* 2107e14bb325SJeff Bonwick * If our of children haven't all completed, 2108e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 2109e14bb325SJeff Bonwick */ 2110e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || 2111e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || 2112e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) 2113e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2114d63d470bSgw 2115e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 2116e14bb325SJeff Bonwick for (int w = 0; w < ZIO_WAIT_TYPES; w++) 2117e14bb325SJeff Bonwick ASSERT(zio->io_children[c][w] == 0); 2118e14bb325SJeff Bonwick 2119e14bb325SJeff Bonwick if (bp != NULL) { 2120e14bb325SJeff Bonwick ASSERT(bp->blk_pad[0] == 0); 2121e14bb325SJeff Bonwick ASSERT(bp->blk_pad[1] == 0); 2122e14bb325SJeff Bonwick ASSERT(bp->blk_pad[2] == 0); 2123e14bb325SJeff Bonwick ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || 2124e14bb325SJeff Bonwick (pio != NULL && bp == pio->io_bp)); 2125e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && 2126e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { 2127e14bb325SJeff Bonwick ASSERT(!BP_SHOULD_BYTESWAP(bp)); 2128e14bb325SJeff Bonwick ASSERT3U(zio->io_prop.zp_ndvas, <=, BP_GET_NDVAS(bp)); 2129e14bb325SJeff Bonwick ASSERT(BP_COUNT_GANG(bp) == 0 || 2130e14bb325SJeff Bonwick (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); 2131e14bb325SJeff Bonwick } 2132e14bb325SJeff Bonwick } 2133fa9e4066Sahrens 2134e14bb325SJeff Bonwick /* 2135e14bb325SJeff Bonwick * If there were child vdev or gang errors, they apply to us now. 2136e14bb325SJeff Bonwick */ 2137e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); 2138e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_GANG); 2139e14bb325SJeff Bonwick 2140e14bb325SJeff Bonwick zio_pop_transforms(zio); /* note: may set zio->io_error */ 2141e14bb325SJeff Bonwick 2142e14bb325SJeff Bonwick vdev_stat_update(zio, psize); 2143e14bb325SJeff Bonwick 2144e14bb325SJeff Bonwick if (zio->io_error) { 2145e14bb325SJeff Bonwick /* 2146e14bb325SJeff Bonwick * If this I/O is attached to a particular vdev, 2147e14bb325SJeff Bonwick * generate an error message describing the I/O failure 2148e14bb325SJeff Bonwick * at the block level. We ignore these errors if the 2149e14bb325SJeff Bonwick * device is currently unavailable. 2150e14bb325SJeff Bonwick */ 2151e14bb325SJeff Bonwick if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) 2152e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, zio, 0, 0); 2153e14bb325SJeff Bonwick 2154e14bb325SJeff Bonwick if ((zio->io_error == EIO || 2155e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) && zio == lio) { 2156e14bb325SJeff Bonwick /* 2157e14bb325SJeff Bonwick * For logical I/O requests, tell the SPA to log the 2158e14bb325SJeff Bonwick * error and generate a logical data ereport. 2159e14bb325SJeff Bonwick */ 2160e14bb325SJeff Bonwick spa_log_error(spa, zio); 2161e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, zio, 2162e14bb325SJeff Bonwick 0, 0); 2163e14bb325SJeff Bonwick } 2164e14bb325SJeff Bonwick } 2165fa9e4066Sahrens 2166e14bb325SJeff Bonwick if (zio->io_error && zio == lio) { 2167e14bb325SJeff Bonwick /* 2168e14bb325SJeff Bonwick * Determine whether zio should be reexecuted. This will 2169e14bb325SJeff Bonwick * propagate all the way to the root via zio_notify_parent(). 2170e14bb325SJeff Bonwick */ 2171e14bb325SJeff Bonwick ASSERT(vd == NULL && bp != NULL); 2172e14bb325SJeff Bonwick 2173e14bb325SJeff Bonwick if (IO_IS_ALLOCATING(zio)) 2174e14bb325SJeff Bonwick if (zio->io_error != ENOSPC) 2175e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_NOW; 2176e14bb325SJeff Bonwick else 2177e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2178e14bb325SJeff Bonwick 2179e14bb325SJeff Bonwick if ((zio->io_type == ZIO_TYPE_READ || 2180e14bb325SJeff Bonwick zio->io_type == ZIO_TYPE_FREE) && 2181e14bb325SJeff Bonwick zio->io_error == ENXIO && 2182*8ad4d6ddSJeff Bonwick spa->spa_load_state == SPA_LOAD_NONE && 2183e14bb325SJeff Bonwick spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) 2184e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2185e14bb325SJeff Bonwick 2186e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) 2187e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2188d63d470bSgw } 2189d63d470bSgw 219067bd71c6Sperrin /* 2191e14bb325SJeff Bonwick * If there were logical child errors, they apply to us now. 2192e14bb325SJeff Bonwick * We defer this until now to avoid conflating logical child 2193e14bb325SJeff Bonwick * errors with errors that happened to the zio itself when 2194e14bb325SJeff Bonwick * updating vdev stats and reporting FMA events above. 219567bd71c6Sperrin */ 2196e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); 21978654d025Sperrin 2198e14bb325SJeff Bonwick if (zio->io_reexecute) { 2199e14bb325SJeff Bonwick /* 2200e14bb325SJeff Bonwick * This is a logical I/O that wants to reexecute. 2201e14bb325SJeff Bonwick * 2202e14bb325SJeff Bonwick * Reexecute is top-down. When an i/o fails, if it's not 2203e14bb325SJeff Bonwick * the root, it simply notifies its parent and sticks around. 2204e14bb325SJeff Bonwick * The parent, seeing that it still has children in zio_done(), 2205e14bb325SJeff Bonwick * does the same. This percolates all the way up to the root. 2206e14bb325SJeff Bonwick * The root i/o will reexecute or suspend the entire tree. 2207e14bb325SJeff Bonwick * 2208e14bb325SJeff Bonwick * This approach ensures that zio_reexecute() honors 2209e14bb325SJeff Bonwick * all the original i/o dependency relationships, e.g. 2210e14bb325SJeff Bonwick * parents not executing until children are ready. 2211e14bb325SJeff Bonwick */ 2212e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2213fa9e4066Sahrens 2214e14bb325SJeff Bonwick if (IO_IS_ALLOCATING(zio)) 2215e14bb325SJeff Bonwick zio_dva_unallocate(zio, zio->io_gang_tree, bp); 2216e14bb325SJeff Bonwick 2217e14bb325SJeff Bonwick zio_gang_tree_free(&zio->io_gang_tree); 2218e14bb325SJeff Bonwick 2219e14bb325SJeff Bonwick if (pio != NULL) { 2220e14bb325SJeff Bonwick /* 2221e14bb325SJeff Bonwick * We're not a root i/o, so there's nothing to do 2222e14bb325SJeff Bonwick * but notify our parent. Don't propagate errors 2223e14bb325SJeff Bonwick * upward since we haven't permanently failed yet. 2224e14bb325SJeff Bonwick */ 2225e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; 2226e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2227e14bb325SJeff Bonwick } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { 2228e14bb325SJeff Bonwick /* 2229e14bb325SJeff Bonwick * We'd fail again if we reexecuted now, so suspend 2230e14bb325SJeff Bonwick * until conditions improve (e.g. device comes online). 2231e14bb325SJeff Bonwick */ 2232e14bb325SJeff Bonwick zio_suspend(spa, zio); 2233e14bb325SJeff Bonwick } else { 2234e14bb325SJeff Bonwick /* 2235e14bb325SJeff Bonwick * Reexecution is potentially a huge amount of work. 2236e14bb325SJeff Bonwick * Hand it off to the otherwise-unused claim taskq. 2237e14bb325SJeff Bonwick */ 2238e14bb325SJeff Bonwick (void) taskq_dispatch( 2239e14bb325SJeff Bonwick spa->spa_zio_taskq[ZIO_TYPE_CLAIM][ZIO_TASKQ_ISSUE], 2240e14bb325SJeff Bonwick (task_func_t *)zio_reexecute, zio, TQ_SLEEP); 2241e14bb325SJeff Bonwick } 2242e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2243fa9e4066Sahrens } 2244fa9e4066Sahrens 2245e14bb325SJeff Bonwick ASSERT(zio->io_child == NULL); 2246e14bb325SJeff Bonwick ASSERT(zio->io_reexecute == 0); 2247e14bb325SJeff Bonwick ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); 2248fa9e4066Sahrens 2249e14bb325SJeff Bonwick if (zio->io_done) 2250e14bb325SJeff Bonwick zio->io_done(zio); 2251fa9e4066Sahrens 2252e14bb325SJeff Bonwick zio_gang_tree_free(&zio->io_gang_tree); 2253e14bb325SJeff Bonwick 2254e14bb325SJeff Bonwick ASSERT(zio->io_delegate_list == NULL); 2255e14bb325SJeff Bonwick ASSERT(zio->io_delegate_next == NULL); 2256fa9e4066Sahrens 2257e14bb325SJeff Bonwick if (pio != NULL) { 2258e14bb325SJeff Bonwick zio_remove_child(pio, zio); 2259e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2260e14bb325SJeff Bonwick } 2261fa9e4066Sahrens 2262e14bb325SJeff Bonwick if (zio->io_waiter != NULL) { 2263e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 2264e14bb325SJeff Bonwick zio->io_executor = NULL; 2265e14bb325SJeff Bonwick cv_broadcast(&zio->io_cv); 2266e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 2267e14bb325SJeff Bonwick } else { 2268e14bb325SJeff Bonwick zio_destroy(zio); 2269e14bb325SJeff Bonwick } 2270fa9e4066Sahrens 2271e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2272fa9e4066Sahrens } 227346341222Sperrin 227446341222Sperrin /* 2275e14bb325SJeff Bonwick * ========================================================================== 2276e14bb325SJeff Bonwick * I/O pipeline definition 2277e14bb325SJeff Bonwick * ========================================================================== 227846341222Sperrin */ 2279e14bb325SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[ZIO_STAGES] = { 2280e14bb325SJeff Bonwick NULL, 2281e14bb325SJeff Bonwick zio_issue_async, 2282e14bb325SJeff Bonwick zio_read_bp_init, 2283e14bb325SJeff Bonwick zio_write_bp_init, 2284e14bb325SJeff Bonwick zio_checksum_generate, 2285e14bb325SJeff Bonwick zio_gang_assemble, 2286e14bb325SJeff Bonwick zio_gang_issue, 2287e14bb325SJeff Bonwick zio_dva_allocate, 2288e14bb325SJeff Bonwick zio_dva_free, 2289e14bb325SJeff Bonwick zio_dva_claim, 2290e14bb325SJeff Bonwick zio_ready, 2291e14bb325SJeff Bonwick zio_vdev_io_start, 2292e14bb325SJeff Bonwick zio_vdev_io_done, 2293e14bb325SJeff Bonwick zio_vdev_io_assess, 2294e14bb325SJeff Bonwick zio_checksum_verify, 2295e14bb325SJeff Bonwick zio_done 2296e14bb325SJeff Bonwick }; 2297