1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 223f9d6ad7SLin Ling * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23be6fd75aSMatthew Ahrens * Copyright (c) 2013 by Delphix. All rights reserved. 245aeb9474SGarrett D'Amore * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved. 25fa9e4066Sahrens */ 26fa9e4066Sahrens 27fa9e4066Sahrens #include <sys/zfs_context.h> 28ea8dc4b6Seschrock #include <sys/fm/fs/zfs.h> 29fa9e4066Sahrens #include <sys/spa.h> 30fa9e4066Sahrens #include <sys/txg.h> 31fa9e4066Sahrens #include <sys/spa_impl.h> 32fa9e4066Sahrens #include <sys/vdev_impl.h> 33fa9e4066Sahrens #include <sys/zio_impl.h> 34fa9e4066Sahrens #include <sys/zio_compress.h> 35fa9e4066Sahrens #include <sys/zio_checksum.h> 36b24ab676SJeff Bonwick #include <sys/dmu_objset.h> 37b24ab676SJeff Bonwick #include <sys/arc.h> 38b24ab676SJeff Bonwick #include <sys/ddt.h> 39*43466aaeSMax Grossman #include <sys/zfeature.h> 40fa9e4066Sahrens 41fa9e4066Sahrens /* 42fa9e4066Sahrens * ========================================================================== 43fa9e4066Sahrens * I/O type descriptions 44fa9e4066Sahrens * ========================================================================== 45fa9e4066Sahrens */ 4669962b56SMatthew Ahrens const char *zio_type_name[ZIO_TYPES] = { 4780eb36f2SGeorge Wilson "zio_null", "zio_read", "zio_write", "zio_free", "zio_claim", 4880eb36f2SGeorge Wilson "zio_ioctl" 4980eb36f2SGeorge Wilson }; 50fa9e4066Sahrens 51fa9e4066Sahrens /* 52fa9e4066Sahrens * ========================================================================== 53fa9e4066Sahrens * I/O kmem caches 54fa9e4066Sahrens * ========================================================================== 55fa9e4066Sahrens */ 56ccae0b50Seschrock kmem_cache_t *zio_cache; 57a3f829aeSBill Moore kmem_cache_t *zio_link_cache; 58fa9e4066Sahrens kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 59ad23a2dbSjohansen kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 60ad23a2dbSjohansen 61ad23a2dbSjohansen #ifdef _KERNEL 62ad23a2dbSjohansen extern vmem_t *zio_alloc_arena; 63ad23a2dbSjohansen #endif 6409c9d376SGeorge Wilson extern int zfs_mg_alloc_failures; 65fa9e4066Sahrens 6601f55e48SGeorge Wilson /* 6701f55e48SGeorge Wilson * The following actions directly effect the spa's sync-to-convergence logic. 6801f55e48SGeorge Wilson * The values below define the sync pass when we start performing the action. 6901f55e48SGeorge Wilson * Care should be taken when changing these values as they directly impact 7001f55e48SGeorge Wilson * spa_sync() performance. Tuning these values may introduce subtle performance 7101f55e48SGeorge Wilson * pathologies and should only be done in the context of performance analysis. 7201f55e48SGeorge Wilson * These tunables will eventually be removed and replaced with #defines once 7301f55e48SGeorge Wilson * enough analysis has been done to determine optimal values. 7401f55e48SGeorge Wilson * 7501f55e48SGeorge Wilson * The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that 7601f55e48SGeorge Wilson * regular blocks are not deferred. 7701f55e48SGeorge Wilson */ 7801f55e48SGeorge Wilson int zfs_sync_pass_deferred_free = 2; /* defer frees starting in this pass */ 7901f55e48SGeorge Wilson int zfs_sync_pass_dont_compress = 5; /* don't compress starting in this pass */ 8001f55e48SGeorge Wilson int zfs_sync_pass_rewrite = 2; /* rewrite new bps starting in this pass */ 8101f55e48SGeorge Wilson 820a4e9518Sgw /* 83e14bb325SJeff Bonwick * An allocating zio is one that either currently has the DVA allocate 84e14bb325SJeff Bonwick * stage set or will have it later in its lifetime. 850a4e9518Sgw */ 86b24ab676SJeff Bonwick #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) 87b24ab676SJeff Bonwick 8835a5a358SJonathan Adams boolean_t zio_requeue_io_start_cut_in_line = B_TRUE; 8935a5a358SJonathan Adams 90b24ab676SJeff Bonwick #ifdef ZFS_DEBUG 91b24ab676SJeff Bonwick int zio_buf_debug_limit = 16384; 92b24ab676SJeff Bonwick #else 93b24ab676SJeff Bonwick int zio_buf_debug_limit = 0; 94b24ab676SJeff Bonwick #endif 950a4e9518Sgw 96fa9e4066Sahrens void 97fa9e4066Sahrens zio_init(void) 98fa9e4066Sahrens { 99fa9e4066Sahrens size_t c; 100ad23a2dbSjohansen vmem_t *data_alloc_arena = NULL; 101ad23a2dbSjohansen 102ad23a2dbSjohansen #ifdef _KERNEL 103ad23a2dbSjohansen data_alloc_arena = zio_alloc_arena; 104ad23a2dbSjohansen #endif 105a3f829aeSBill Moore zio_cache = kmem_cache_create("zio_cache", 106a3f829aeSBill Moore sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 107a3f829aeSBill Moore zio_link_cache = kmem_cache_create("zio_link_cache", 108a3f829aeSBill Moore sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 109ccae0b50Seschrock 110fa9e4066Sahrens /* 111fa9e4066Sahrens * For small buffers, we want a cache for each multiple of 112fa9e4066Sahrens * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache 113fa9e4066Sahrens * for each quarter-power of 2. For large buffers, we want 114fa9e4066Sahrens * a cache for each multiple of PAGESIZE. 115fa9e4066Sahrens */ 116fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 117fa9e4066Sahrens size_t size = (c + 1) << SPA_MINBLOCKSHIFT; 118fa9e4066Sahrens size_t p2 = size; 119fa9e4066Sahrens size_t align = 0; 120e291592aSJonathan Adams size_t cflags = (size > zio_buf_debug_limit) ? KMC_NODEBUG : 0; 121fa9e4066Sahrens 122fa9e4066Sahrens while (p2 & (p2 - 1)) 123fa9e4066Sahrens p2 &= p2 - 1; 124fa9e4066Sahrens 125cd1c8b85SMatthew Ahrens #ifndef _KERNEL 126cd1c8b85SMatthew Ahrens /* 127cd1c8b85SMatthew Ahrens * If we are using watchpoints, put each buffer on its own page, 128cd1c8b85SMatthew Ahrens * to eliminate the performance overhead of trapping to the 129cd1c8b85SMatthew Ahrens * kernel when modifying a non-watched buffer that shares the 130cd1c8b85SMatthew Ahrens * page with a watched buffer. 131cd1c8b85SMatthew Ahrens */ 132cd1c8b85SMatthew Ahrens if (arc_watch && !IS_P2ALIGNED(size, PAGESIZE)) 133cd1c8b85SMatthew Ahrens continue; 134cd1c8b85SMatthew Ahrens #endif 135fa9e4066Sahrens if (size <= 4 * SPA_MINBLOCKSIZE) { 136fa9e4066Sahrens align = SPA_MINBLOCKSIZE; 137cd1c8b85SMatthew Ahrens } else if (IS_P2ALIGNED(size, PAGESIZE)) { 138fa9e4066Sahrens align = PAGESIZE; 139cd1c8b85SMatthew Ahrens } else if (IS_P2ALIGNED(size, p2 >> 2)) { 140fa9e4066Sahrens align = p2 >> 2; 141fa9e4066Sahrens } 142fa9e4066Sahrens 143fa9e4066Sahrens if (align != 0) { 144ad23a2dbSjohansen char name[36]; 1455ad82045Snd (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); 146fa9e4066Sahrens zio_buf_cache[c] = kmem_cache_create(name, size, 147e291592aSJonathan Adams align, NULL, NULL, NULL, NULL, NULL, cflags); 148ad23a2dbSjohansen 149e291592aSJonathan Adams /* 150e291592aSJonathan Adams * Since zio_data bufs do not appear in crash dumps, we 151e291592aSJonathan Adams * pass KMC_NOTOUCH so that no allocator metadata is 152e291592aSJonathan Adams * stored with the buffers. 153e291592aSJonathan Adams */ 154ad23a2dbSjohansen (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); 155ad23a2dbSjohansen zio_data_buf_cache[c] = kmem_cache_create(name, size, 156ad23a2dbSjohansen align, NULL, NULL, NULL, NULL, data_alloc_arena, 157e291592aSJonathan Adams cflags | KMC_NOTOUCH); 158fa9e4066Sahrens } 159fa9e4066Sahrens } 160fa9e4066Sahrens 161fa9e4066Sahrens while (--c != 0) { 162fa9e4066Sahrens ASSERT(zio_buf_cache[c] != NULL); 163fa9e4066Sahrens if (zio_buf_cache[c - 1] == NULL) 164fa9e4066Sahrens zio_buf_cache[c - 1] = zio_buf_cache[c]; 165ad23a2dbSjohansen 166ad23a2dbSjohansen ASSERT(zio_data_buf_cache[c] != NULL); 167ad23a2dbSjohansen if (zio_data_buf_cache[c - 1] == NULL) 168ad23a2dbSjohansen zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; 169fa9e4066Sahrens } 170ea8dc4b6Seschrock 17109c9d376SGeorge Wilson /* 17209c9d376SGeorge Wilson * The zio write taskqs have 1 thread per cpu, allow 1/2 of the taskqs 17309c9d376SGeorge Wilson * to fail 3 times per txg or 8 failures, whichever is greater. 17409c9d376SGeorge Wilson */ 17522e30981SGeorge Wilson if (zfs_mg_alloc_failures == 0) 17622e30981SGeorge Wilson zfs_mg_alloc_failures = MAX((3 * max_ncpus / 2), 8); 17709c9d376SGeorge Wilson 178ea8dc4b6Seschrock zio_inject_init(); 179fa9e4066Sahrens } 180fa9e4066Sahrens 181fa9e4066Sahrens void 182fa9e4066Sahrens zio_fini(void) 183fa9e4066Sahrens { 184fa9e4066Sahrens size_t c; 185fa9e4066Sahrens kmem_cache_t *last_cache = NULL; 186ad23a2dbSjohansen kmem_cache_t *last_data_cache = NULL; 187fa9e4066Sahrens 188fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 189fa9e4066Sahrens if (zio_buf_cache[c] != last_cache) { 190fa9e4066Sahrens last_cache = zio_buf_cache[c]; 191fa9e4066Sahrens kmem_cache_destroy(zio_buf_cache[c]); 192fa9e4066Sahrens } 193fa9e4066Sahrens zio_buf_cache[c] = NULL; 194ad23a2dbSjohansen 195ad23a2dbSjohansen if (zio_data_buf_cache[c] != last_data_cache) { 196ad23a2dbSjohansen last_data_cache = zio_data_buf_cache[c]; 197ad23a2dbSjohansen kmem_cache_destroy(zio_data_buf_cache[c]); 198ad23a2dbSjohansen } 199ad23a2dbSjohansen zio_data_buf_cache[c] = NULL; 200fa9e4066Sahrens } 201ea8dc4b6Seschrock 202a3f829aeSBill Moore kmem_cache_destroy(zio_link_cache); 203ccae0b50Seschrock kmem_cache_destroy(zio_cache); 204ccae0b50Seschrock 205ea8dc4b6Seschrock zio_inject_fini(); 206fa9e4066Sahrens } 207fa9e4066Sahrens 208fa9e4066Sahrens /* 209fa9e4066Sahrens * ========================================================================== 210fa9e4066Sahrens * Allocate and free I/O buffers 211fa9e4066Sahrens * ========================================================================== 212fa9e4066Sahrens */ 213ad23a2dbSjohansen 214ad23a2dbSjohansen /* 215ad23a2dbSjohansen * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a 216ad23a2dbSjohansen * crashdump if the kernel panics, so use it judiciously. Obviously, it's 217ad23a2dbSjohansen * useful to inspect ZFS metadata, but if possible, we should avoid keeping 218ad23a2dbSjohansen * excess / transient data in-core during a crashdump. 219ad23a2dbSjohansen */ 220fa9e4066Sahrens void * 221fa9e4066Sahrens zio_buf_alloc(size_t size) 222fa9e4066Sahrens { 223fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 224fa9e4066Sahrens 225fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 226fa9e4066Sahrens 2271ab7f2deSmaybee return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); 228fa9e4066Sahrens } 229fa9e4066Sahrens 230ad23a2dbSjohansen /* 231ad23a2dbSjohansen * Use zio_data_buf_alloc to allocate data. The data will not appear in a 232ad23a2dbSjohansen * crashdump if the kernel panics. This exists so that we will limit the amount 233ad23a2dbSjohansen * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount 234ad23a2dbSjohansen * of kernel heap dumped to disk when the kernel panics) 235ad23a2dbSjohansen */ 236ad23a2dbSjohansen void * 237ad23a2dbSjohansen zio_data_buf_alloc(size_t size) 238ad23a2dbSjohansen { 239ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 240ad23a2dbSjohansen 241ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 242ad23a2dbSjohansen 2431ab7f2deSmaybee return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); 244ad23a2dbSjohansen } 245ad23a2dbSjohansen 246fa9e4066Sahrens void 247fa9e4066Sahrens zio_buf_free(void *buf, size_t size) 248fa9e4066Sahrens { 249fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 250fa9e4066Sahrens 251fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 252fa9e4066Sahrens 253fa9e4066Sahrens kmem_cache_free(zio_buf_cache[c], buf); 254fa9e4066Sahrens } 255fa9e4066Sahrens 256ad23a2dbSjohansen void 257ad23a2dbSjohansen zio_data_buf_free(void *buf, size_t size) 258ad23a2dbSjohansen { 259ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 260ad23a2dbSjohansen 261ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 262ad23a2dbSjohansen 263ad23a2dbSjohansen kmem_cache_free(zio_data_buf_cache[c], buf); 264ad23a2dbSjohansen } 265b3995adbSahrens 266fa9e4066Sahrens /* 267fa9e4066Sahrens * ========================================================================== 268fa9e4066Sahrens * Push and pop I/O transform buffers 269fa9e4066Sahrens * ========================================================================== 270fa9e4066Sahrens */ 271fa9e4066Sahrens static void 272e14bb325SJeff Bonwick zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, 273e14bb325SJeff Bonwick zio_transform_func_t *transform) 274fa9e4066Sahrens { 275fa9e4066Sahrens zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); 276fa9e4066Sahrens 277e14bb325SJeff Bonwick zt->zt_orig_data = zio->io_data; 278e14bb325SJeff Bonwick zt->zt_orig_size = zio->io_size; 279fa9e4066Sahrens zt->zt_bufsize = bufsize; 280e14bb325SJeff Bonwick zt->zt_transform = transform; 281fa9e4066Sahrens 282fa9e4066Sahrens zt->zt_next = zio->io_transform_stack; 283fa9e4066Sahrens zio->io_transform_stack = zt; 284fa9e4066Sahrens 285fa9e4066Sahrens zio->io_data = data; 286fa9e4066Sahrens zio->io_size = size; 287fa9e4066Sahrens } 288fa9e4066Sahrens 289fa9e4066Sahrens static void 290e14bb325SJeff Bonwick zio_pop_transforms(zio_t *zio) 291fa9e4066Sahrens { 292e14bb325SJeff Bonwick zio_transform_t *zt; 293e14bb325SJeff Bonwick 294e14bb325SJeff Bonwick while ((zt = zio->io_transform_stack) != NULL) { 295e14bb325SJeff Bonwick if (zt->zt_transform != NULL) 296e14bb325SJeff Bonwick zt->zt_transform(zio, 297e14bb325SJeff Bonwick zt->zt_orig_data, zt->zt_orig_size); 298fa9e4066Sahrens 299b24ab676SJeff Bonwick if (zt->zt_bufsize != 0) 300b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zt->zt_bufsize); 301fa9e4066Sahrens 302e14bb325SJeff Bonwick zio->io_data = zt->zt_orig_data; 303e14bb325SJeff Bonwick zio->io_size = zt->zt_orig_size; 304e14bb325SJeff Bonwick zio->io_transform_stack = zt->zt_next; 305fa9e4066Sahrens 306e14bb325SJeff Bonwick kmem_free(zt, sizeof (zio_transform_t)); 307fa9e4066Sahrens } 308fa9e4066Sahrens } 309fa9e4066Sahrens 310e14bb325SJeff Bonwick /* 311e14bb325SJeff Bonwick * ========================================================================== 312e14bb325SJeff Bonwick * I/O transform callbacks for subblocks and decompression 313e14bb325SJeff Bonwick * ========================================================================== 314e14bb325SJeff Bonwick */ 315e14bb325SJeff Bonwick static void 316e14bb325SJeff Bonwick zio_subblock(zio_t *zio, void *data, uint64_t size) 317e14bb325SJeff Bonwick { 318e14bb325SJeff Bonwick ASSERT(zio->io_size > size); 319e14bb325SJeff Bonwick 320e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ) 321e14bb325SJeff Bonwick bcopy(zio->io_data, data, size); 322e14bb325SJeff Bonwick } 323e14bb325SJeff Bonwick 324e14bb325SJeff Bonwick static void 325e14bb325SJeff Bonwick zio_decompress(zio_t *zio, void *data, uint64_t size) 326e14bb325SJeff Bonwick { 327e14bb325SJeff Bonwick if (zio->io_error == 0 && 328e14bb325SJeff Bonwick zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), 329b24ab676SJeff Bonwick zio->io_data, data, zio->io_size, size) != 0) 330be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(EIO); 331e14bb325SJeff Bonwick } 332e14bb325SJeff Bonwick 333e14bb325SJeff Bonwick /* 334e14bb325SJeff Bonwick * ========================================================================== 335e14bb325SJeff Bonwick * I/O parent/child relationships and pipeline interlocks 336e14bb325SJeff Bonwick * ========================================================================== 337e14bb325SJeff Bonwick */ 338a3f829aeSBill Moore /* 339a3f829aeSBill Moore * NOTE - Callers to zio_walk_parents() and zio_walk_children must 340a3f829aeSBill Moore * continue calling these functions until they return NULL. 341a3f829aeSBill Moore * Otherwise, the next caller will pick up the list walk in 342a3f829aeSBill Moore * some indeterminate state. (Otherwise every caller would 343a3f829aeSBill Moore * have to pass in a cookie to keep the state represented by 344a3f829aeSBill Moore * io_walk_link, which gets annoying.) 345a3f829aeSBill Moore */ 346a3f829aeSBill Moore zio_t * 347a3f829aeSBill Moore zio_walk_parents(zio_t *cio) 348a3f829aeSBill Moore { 349a3f829aeSBill Moore zio_link_t *zl = cio->io_walk_link; 350a3f829aeSBill Moore list_t *pl = &cio->io_parent_list; 351e14bb325SJeff Bonwick 352a3f829aeSBill Moore zl = (zl == NULL) ? list_head(pl) : list_next(pl, zl); 353a3f829aeSBill Moore cio->io_walk_link = zl; 354a3f829aeSBill Moore 355a3f829aeSBill Moore if (zl == NULL) 356a3f829aeSBill Moore return (NULL); 357a3f829aeSBill Moore 358a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 359a3f829aeSBill Moore return (zl->zl_parent); 360a3f829aeSBill Moore } 361a3f829aeSBill Moore 362a3f829aeSBill Moore zio_t * 363a3f829aeSBill Moore zio_walk_children(zio_t *pio) 364a3f829aeSBill Moore { 365a3f829aeSBill Moore zio_link_t *zl = pio->io_walk_link; 366a3f829aeSBill Moore list_t *cl = &pio->io_child_list; 367a3f829aeSBill Moore 368a3f829aeSBill Moore zl = (zl == NULL) ? list_head(cl) : list_next(cl, zl); 369a3f829aeSBill Moore pio->io_walk_link = zl; 370a3f829aeSBill Moore 371a3f829aeSBill Moore if (zl == NULL) 372a3f829aeSBill Moore return (NULL); 373a3f829aeSBill Moore 374a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 375a3f829aeSBill Moore return (zl->zl_child); 376a3f829aeSBill Moore } 377a3f829aeSBill Moore 378a3f829aeSBill Moore zio_t * 379a3f829aeSBill Moore zio_unique_parent(zio_t *cio) 380a3f829aeSBill Moore { 381a3f829aeSBill Moore zio_t *pio = zio_walk_parents(cio); 382a3f829aeSBill Moore 383a3f829aeSBill Moore VERIFY(zio_walk_parents(cio) == NULL); 384a3f829aeSBill Moore return (pio); 385a3f829aeSBill Moore } 386a3f829aeSBill Moore 387a3f829aeSBill Moore void 388a3f829aeSBill Moore zio_add_child(zio_t *pio, zio_t *cio) 389e14bb325SJeff Bonwick { 390a3f829aeSBill Moore zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); 391a3f829aeSBill Moore 392a3f829aeSBill Moore /* 393a3f829aeSBill Moore * Logical I/Os can have logical, gang, or vdev children. 394a3f829aeSBill Moore * Gang I/Os can have gang or vdev children. 395a3f829aeSBill Moore * Vdev I/Os can only have vdev children. 396a3f829aeSBill Moore * The following ASSERT captures all of these constraints. 397a3f829aeSBill Moore */ 398a3f829aeSBill Moore ASSERT(cio->io_child_type <= pio->io_child_type); 399a3f829aeSBill Moore 400a3f829aeSBill Moore zl->zl_parent = pio; 401a3f829aeSBill Moore zl->zl_child = cio; 402a3f829aeSBill Moore 403a3f829aeSBill Moore mutex_enter(&cio->io_lock); 404e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 405a3f829aeSBill Moore 406a3f829aeSBill Moore ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); 407a3f829aeSBill Moore 408a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 409a3f829aeSBill Moore pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; 410a3f829aeSBill Moore 411a3f829aeSBill Moore list_insert_head(&pio->io_child_list, zl); 412a3f829aeSBill Moore list_insert_head(&cio->io_parent_list, zl); 413a3f829aeSBill Moore 414b24ab676SJeff Bonwick pio->io_child_count++; 415b24ab676SJeff Bonwick cio->io_parent_count++; 416b24ab676SJeff Bonwick 417e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 418a3f829aeSBill Moore mutex_exit(&cio->io_lock); 419e14bb325SJeff Bonwick } 420e14bb325SJeff Bonwick 421fa9e4066Sahrens static void 422a3f829aeSBill Moore zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) 423e14bb325SJeff Bonwick { 424a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 425a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 426e14bb325SJeff Bonwick 427a3f829aeSBill Moore mutex_enter(&cio->io_lock); 428e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 429a3f829aeSBill Moore 430a3f829aeSBill Moore list_remove(&pio->io_child_list, zl); 431a3f829aeSBill Moore list_remove(&cio->io_parent_list, zl); 432a3f829aeSBill Moore 433b24ab676SJeff Bonwick pio->io_child_count--; 434b24ab676SJeff Bonwick cio->io_parent_count--; 435b24ab676SJeff Bonwick 436e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 437a3f829aeSBill Moore mutex_exit(&cio->io_lock); 438a3f829aeSBill Moore 439a3f829aeSBill Moore kmem_cache_free(zio_link_cache, zl); 440e14bb325SJeff Bonwick } 441e14bb325SJeff Bonwick 442e14bb325SJeff Bonwick static boolean_t 443e14bb325SJeff Bonwick zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) 444fa9e4066Sahrens { 445e14bb325SJeff Bonwick uint64_t *countp = &zio->io_children[child][wait]; 446e14bb325SJeff Bonwick boolean_t waiting = B_FALSE; 447e14bb325SJeff Bonwick 448e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 449e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 450e14bb325SJeff Bonwick if (*countp != 0) { 451b24ab676SJeff Bonwick zio->io_stage >>= 1; 452e14bb325SJeff Bonwick zio->io_stall = countp; 453e14bb325SJeff Bonwick waiting = B_TRUE; 454e14bb325SJeff Bonwick } 455e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 456e14bb325SJeff Bonwick 457e14bb325SJeff Bonwick return (waiting); 458e14bb325SJeff Bonwick } 459fa9e4066Sahrens 460e14bb325SJeff Bonwick static void 461e14bb325SJeff Bonwick zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) 462e14bb325SJeff Bonwick { 463e14bb325SJeff Bonwick uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; 464e14bb325SJeff Bonwick int *errorp = &pio->io_child_error[zio->io_child_type]; 465fa9e4066Sahrens 466e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 467e14bb325SJeff Bonwick if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 468e14bb325SJeff Bonwick *errorp = zio_worst_error(*errorp, zio->io_error); 469e14bb325SJeff Bonwick pio->io_reexecute |= zio->io_reexecute; 470e14bb325SJeff Bonwick ASSERT3U(*countp, >, 0); 47169962b56SMatthew Ahrens 47269962b56SMatthew Ahrens (*countp)--; 47369962b56SMatthew Ahrens 47469962b56SMatthew Ahrens if (*countp == 0 && pio->io_stall == countp) { 475e14bb325SJeff Bonwick pio->io_stall = NULL; 476e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 477e14bb325SJeff Bonwick zio_execute(pio); 478e14bb325SJeff Bonwick } else { 479e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 480fa9e4066Sahrens } 481fa9e4066Sahrens } 482fa9e4066Sahrens 483e14bb325SJeff Bonwick static void 484e14bb325SJeff Bonwick zio_inherit_child_errors(zio_t *zio, enum zio_child c) 485e14bb325SJeff Bonwick { 486e14bb325SJeff Bonwick if (zio->io_child_error[c] != 0 && zio->io_error == 0) 487e14bb325SJeff Bonwick zio->io_error = zio->io_child_error[c]; 488e14bb325SJeff Bonwick } 489e14bb325SJeff Bonwick 490fa9e4066Sahrens /* 491fa9e4066Sahrens * ========================================================================== 492e14bb325SJeff Bonwick * Create the various types of I/O (read, write, free, etc) 493fa9e4066Sahrens * ========================================================================== 494fa9e4066Sahrens */ 495fa9e4066Sahrens static zio_t * 496b24ab676SJeff Bonwick zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 497fa9e4066Sahrens void *data, uint64_t size, zio_done_func_t *done, void *private, 49869962b56SMatthew Ahrens zio_type_t type, zio_priority_t priority, enum zio_flag flags, 499b24ab676SJeff Bonwick vdev_t *vd, uint64_t offset, const zbookmark_t *zb, 500b24ab676SJeff Bonwick enum zio_stage stage, enum zio_stage pipeline) 501fa9e4066Sahrens { 502fa9e4066Sahrens zio_t *zio; 503fa9e4066Sahrens 504fa9e4066Sahrens ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); 505fa9e4066Sahrens ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); 506e14bb325SJeff Bonwick ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); 507fa9e4066Sahrens 508e14bb325SJeff Bonwick ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); 509e14bb325SJeff Bonwick ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); 510e14bb325SJeff Bonwick ASSERT(vd || stage == ZIO_STAGE_OPEN); 511088f3894Sahrens 512ccae0b50Seschrock zio = kmem_cache_alloc(zio_cache, KM_SLEEP); 513ccae0b50Seschrock bzero(zio, sizeof (zio_t)); 514e14bb325SJeff Bonwick 515e14bb325SJeff Bonwick mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); 516e14bb325SJeff Bonwick cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); 517e14bb325SJeff Bonwick 518a3f829aeSBill Moore list_create(&zio->io_parent_list, sizeof (zio_link_t), 519a3f829aeSBill Moore offsetof(zio_link_t, zl_parent_node)); 520a3f829aeSBill Moore list_create(&zio->io_child_list, sizeof (zio_link_t), 521a3f829aeSBill Moore offsetof(zio_link_t, zl_child_node)); 522a3f829aeSBill Moore 523e14bb325SJeff Bonwick if (vd != NULL) 524e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_VDEV; 525e14bb325SJeff Bonwick else if (flags & ZIO_FLAG_GANG_CHILD) 526e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_GANG; 527b24ab676SJeff Bonwick else if (flags & ZIO_FLAG_DDT_CHILD) 528b24ab676SJeff Bonwick zio->io_child_type = ZIO_CHILD_DDT; 529e14bb325SJeff Bonwick else 530e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_LOGICAL; 531e14bb325SJeff Bonwick 532fa9e4066Sahrens if (bp != NULL) { 533b24ab676SJeff Bonwick zio->io_bp = (blkptr_t *)bp; 534fa9e4066Sahrens zio->io_bp_copy = *bp; 535fa9e4066Sahrens zio->io_bp_orig = *bp; 536b24ab676SJeff Bonwick if (type != ZIO_TYPE_WRITE || 537b24ab676SJeff Bonwick zio->io_child_type == ZIO_CHILD_DDT) 538e14bb325SJeff Bonwick zio->io_bp = &zio->io_bp_copy; /* so caller can free */ 539f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL) 540e14bb325SJeff Bonwick zio->io_logical = zio; 541f5383399SBill Moore if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) 542f5383399SBill Moore pipeline |= ZIO_GANG_STAGES; 543fa9e4066Sahrens } 544e14bb325SJeff Bonwick 545e14bb325SJeff Bonwick zio->io_spa = spa; 546e14bb325SJeff Bonwick zio->io_txg = txg; 547fa9e4066Sahrens zio->io_done = done; 548fa9e4066Sahrens zio->io_private = private; 549fa9e4066Sahrens zio->io_type = type; 550fa9e4066Sahrens zio->io_priority = priority; 551e14bb325SJeff Bonwick zio->io_vd = vd; 552e14bb325SJeff Bonwick zio->io_offset = offset; 553b24ab676SJeff Bonwick zio->io_orig_data = zio->io_data = data; 554b24ab676SJeff Bonwick zio->io_orig_size = zio->io_size = size; 555e14bb325SJeff Bonwick zio->io_orig_flags = zio->io_flags = flags; 556e14bb325SJeff Bonwick zio->io_orig_stage = zio->io_stage = stage; 557e14bb325SJeff Bonwick zio->io_orig_pipeline = zio->io_pipeline = pipeline; 558fa9e4066Sahrens 559a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); 560a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); 561a3f829aeSBill Moore 562e14bb325SJeff Bonwick if (zb != NULL) 563e14bb325SJeff Bonwick zio->io_bookmark = *zb; 564e14bb325SJeff Bonwick 565e14bb325SJeff Bonwick if (pio != NULL) { 566e14bb325SJeff Bonwick if (zio->io_logical == NULL) 567ea8dc4b6Seschrock zio->io_logical = pio->io_logical; 568f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_GANG) 569f5383399SBill Moore zio->io_gang_leader = pio->io_gang_leader; 570e14bb325SJeff Bonwick zio_add_child(pio, zio); 571fa9e4066Sahrens } 572fa9e4066Sahrens 573fa9e4066Sahrens return (zio); 574fa9e4066Sahrens } 575fa9e4066Sahrens 5760a4e9518Sgw static void 577e14bb325SJeff Bonwick zio_destroy(zio_t *zio) 5780a4e9518Sgw { 579a3f829aeSBill Moore list_destroy(&zio->io_parent_list); 580a3f829aeSBill Moore list_destroy(&zio->io_child_list); 581e14bb325SJeff Bonwick mutex_destroy(&zio->io_lock); 582e14bb325SJeff Bonwick cv_destroy(&zio->io_cv); 583e14bb325SJeff Bonwick kmem_cache_free(zio_cache, zio); 5840a4e9518Sgw } 5850a4e9518Sgw 586fa9e4066Sahrens zio_t * 587a3f829aeSBill Moore zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, 588b24ab676SJeff Bonwick void *private, enum zio_flag flags) 589fa9e4066Sahrens { 590fa9e4066Sahrens zio_t *zio; 591fa9e4066Sahrens 592fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 593a3f829aeSBill Moore ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 594e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); 595fa9e4066Sahrens 596fa9e4066Sahrens return (zio); 597fa9e4066Sahrens } 598fa9e4066Sahrens 599fa9e4066Sahrens zio_t * 600b24ab676SJeff Bonwick zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) 601fa9e4066Sahrens { 602a3f829aeSBill Moore return (zio_null(NULL, spa, NULL, done, private, flags)); 603fa9e4066Sahrens } 604fa9e4066Sahrens 605fa9e4066Sahrens zio_t * 606e14bb325SJeff Bonwick zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 607e14bb325SJeff Bonwick void *data, uint64_t size, zio_done_func_t *done, void *private, 60869962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb) 609fa9e4066Sahrens { 610fa9e4066Sahrens zio_t *zio; 611fa9e4066Sahrens 612b24ab676SJeff Bonwick zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, 613088f3894Sahrens data, size, done, private, 614e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, NULL, 0, zb, 615b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 616b24ab676SJeff Bonwick ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); 617fa9e4066Sahrens 618fa9e4066Sahrens return (zio); 619fa9e4066Sahrens } 620fa9e4066Sahrens 621fa9e4066Sahrens zio_t * 622e14bb325SJeff Bonwick zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 623b24ab676SJeff Bonwick void *data, uint64_t size, const zio_prop_t *zp, 62469962b56SMatthew Ahrens zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done, 62569962b56SMatthew Ahrens void *private, 62669962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb) 627fa9e4066Sahrens { 628fa9e4066Sahrens zio_t *zio; 629fa9e4066Sahrens 630e14bb325SJeff Bonwick ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && 631e14bb325SJeff Bonwick zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && 632e14bb325SJeff Bonwick zp->zp_compress >= ZIO_COMPRESS_OFF && 633e14bb325SJeff Bonwick zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && 634ad135b5dSChristopher Siden DMU_OT_IS_VALID(zp->zp_type) && 635e14bb325SJeff Bonwick zp->zp_level < 32 && 636b24ab676SJeff Bonwick zp->zp_copies > 0 && 63780901aeaSGeorge Wilson zp->zp_copies <= spa_max_replication(spa)); 6380a4e9518Sgw 639fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 640e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 641b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 642b24ab676SJeff Bonwick ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); 643fa9e4066Sahrens 644c717a561Smaybee zio->io_ready = ready; 64569962b56SMatthew Ahrens zio->io_physdone = physdone; 646e14bb325SJeff Bonwick zio->io_prop = *zp; 647fa9e4066Sahrens 648fa9e4066Sahrens return (zio); 649fa9e4066Sahrens } 650fa9e4066Sahrens 651fa9e4066Sahrens zio_t * 652e14bb325SJeff Bonwick zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, 65369962b56SMatthew Ahrens uint64_t size, zio_done_func_t *done, void *private, 65469962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, zbookmark_t *zb) 655fa9e4066Sahrens { 656fa9e4066Sahrens zio_t *zio; 657fa9e4066Sahrens 658fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 659e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 660e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); 661fa9e4066Sahrens 662fa9e4066Sahrens return (zio); 663fa9e4066Sahrens } 664fa9e4066Sahrens 665b24ab676SJeff Bonwick void 66680901aeaSGeorge Wilson zio_write_override(zio_t *zio, blkptr_t *bp, int copies, boolean_t nopwrite) 667b24ab676SJeff Bonwick { 668b24ab676SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 669b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 670b24ab676SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 671b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); 672b24ab676SJeff Bonwick 67380901aeaSGeorge Wilson /* 67480901aeaSGeorge Wilson * We must reset the io_prop to match the values that existed 67580901aeaSGeorge Wilson * when the bp was first written by dmu_sync() keeping in mind 67680901aeaSGeorge Wilson * that nopwrite and dedup are mutually exclusive. 67780901aeaSGeorge Wilson */ 67880901aeaSGeorge Wilson zio->io_prop.zp_dedup = nopwrite ? B_FALSE : zio->io_prop.zp_dedup; 67980901aeaSGeorge Wilson zio->io_prop.zp_nopwrite = nopwrite; 680b24ab676SJeff Bonwick zio->io_prop.zp_copies = copies; 681b24ab676SJeff Bonwick zio->io_bp_override = bp; 682b24ab676SJeff Bonwick } 683b24ab676SJeff Bonwick 684b24ab676SJeff Bonwick void 685b24ab676SJeff Bonwick zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) 686b24ab676SJeff Bonwick { 6873b2aab18SMatthew Ahrens metaslab_check_free(spa, bp); 6889cb154a3SMatthew Ahrens 6899cb154a3SMatthew Ahrens /* 6909cb154a3SMatthew Ahrens * Frees that are for the currently-syncing txg, are not going to be 6919cb154a3SMatthew Ahrens * deferred, and which will not need to do a read (i.e. not GANG or 6929cb154a3SMatthew Ahrens * DEDUP), can be processed immediately. Otherwise, put them on the 6939cb154a3SMatthew Ahrens * in-memory list for later processing. 6949cb154a3SMatthew Ahrens */ 6959cb154a3SMatthew Ahrens if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp) || 6969cb154a3SMatthew Ahrens txg != spa->spa_syncing_txg || 6979cb154a3SMatthew Ahrens spa_sync_pass(spa) >= zfs_sync_pass_deferred_free) { 6989cb154a3SMatthew Ahrens bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp); 6999cb154a3SMatthew Ahrens } else { 7009cb154a3SMatthew Ahrens VERIFY0(zio_wait(zio_free_sync(NULL, spa, txg, bp, 0))); 7019cb154a3SMatthew Ahrens } 702b24ab676SJeff Bonwick } 703b24ab676SJeff Bonwick 704fa9e4066Sahrens zio_t * 705b24ab676SJeff Bonwick zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 706b24ab676SJeff Bonwick enum zio_flag flags) 707fa9e4066Sahrens { 708fa9e4066Sahrens zio_t *zio; 7099cb154a3SMatthew Ahrens enum zio_stage stage = ZIO_FREE_PIPELINE; 710fa9e4066Sahrens 7113f9d6ad7SLin Ling dprintf_bp(bp, "freeing in txg %llu, pass %u", 7123f9d6ad7SLin Ling (longlong_t)txg, spa->spa_sync_pass); 7133f9d6ad7SLin Ling 714fa9e4066Sahrens ASSERT(!BP_IS_HOLE(bp)); 715b24ab676SJeff Bonwick ASSERT(spa_syncing_txg(spa) == txg); 71601f55e48SGeorge Wilson ASSERT(spa_sync_pass(spa) < zfs_sync_pass_deferred_free); 717fa9e4066Sahrens 7183b2aab18SMatthew Ahrens metaslab_check_free(spa, bp); 7196e6d5868SMatthew Ahrens arc_freed(spa, bp); 7203b2aab18SMatthew Ahrens 7219cb154a3SMatthew Ahrens /* 7229cb154a3SMatthew Ahrens * GANG and DEDUP blocks can induce a read (for the gang block header, 7239cb154a3SMatthew Ahrens * or the DDT), so issue them asynchronously so that this thread is 7249cb154a3SMatthew Ahrens * not tied up. 7259cb154a3SMatthew Ahrens */ 7269cb154a3SMatthew Ahrens if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp)) 7279cb154a3SMatthew Ahrens stage |= ZIO_STAGE_ISSUE_ASYNC; 7289cb154a3SMatthew Ahrens 729e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 73069962b56SMatthew Ahrens NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_NOW, flags, 7319cb154a3SMatthew Ahrens NULL, 0, NULL, ZIO_STAGE_OPEN, stage); 7329cb154a3SMatthew Ahrens 733fa9e4066Sahrens 734fa9e4066Sahrens return (zio); 735fa9e4066Sahrens } 736fa9e4066Sahrens 737fa9e4066Sahrens zio_t * 738b24ab676SJeff Bonwick zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 739b24ab676SJeff Bonwick zio_done_func_t *done, void *private, enum zio_flag flags) 740fa9e4066Sahrens { 741fa9e4066Sahrens zio_t *zio; 742fa9e4066Sahrens 743fa9e4066Sahrens /* 744fa9e4066Sahrens * A claim is an allocation of a specific block. Claims are needed 745fa9e4066Sahrens * to support immediate writes in the intent log. The issue is that 746fa9e4066Sahrens * immediate writes contain committed data, but in a txg that was 747fa9e4066Sahrens * *not* committed. Upon opening the pool after an unclean shutdown, 748fa9e4066Sahrens * the intent log claims all blocks that contain immediate write data 749fa9e4066Sahrens * so that the SPA knows they're in use. 750fa9e4066Sahrens * 751fa9e4066Sahrens * All claims *must* be resolved in the first txg -- before the SPA 752fa9e4066Sahrens * starts allocating blocks -- so that nothing is allocated twice. 753b24ab676SJeff Bonwick * If txg == 0 we just verify that the block is claimable. 754fa9e4066Sahrens */ 755fa9e4066Sahrens ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); 756b24ab676SJeff Bonwick ASSERT(txg == spa_first_txg(spa) || txg == 0); 757b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ 758fa9e4066Sahrens 759e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 760e14bb325SJeff Bonwick done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, 761e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); 762fa9e4066Sahrens 763fa9e4066Sahrens return (zio); 764fa9e4066Sahrens } 765fa9e4066Sahrens 766fa9e4066Sahrens zio_t * 767fa9e4066Sahrens zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 76869962b56SMatthew Ahrens zio_done_func_t *done, void *private, enum zio_flag flags) 769fa9e4066Sahrens { 770fa9e4066Sahrens zio_t *zio; 771fa9e4066Sahrens int c; 772fa9e4066Sahrens 773fa9e4066Sahrens if (vd->vdev_children == 0) { 774fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 77569962b56SMatthew Ahrens ZIO_TYPE_IOCTL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 776fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); 777fa9e4066Sahrens 778fa9e4066Sahrens zio->io_cmd = cmd; 779fa9e4066Sahrens } else { 780a3f829aeSBill Moore zio = zio_null(pio, spa, NULL, NULL, NULL, flags); 781fa9e4066Sahrens 782fa9e4066Sahrens for (c = 0; c < vd->vdev_children; c++) 783fa9e4066Sahrens zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, 78469962b56SMatthew Ahrens done, private, flags)); 785fa9e4066Sahrens } 786fa9e4066Sahrens 787fa9e4066Sahrens return (zio); 788fa9e4066Sahrens } 789fa9e4066Sahrens 790fa9e4066Sahrens zio_t * 791fa9e4066Sahrens zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 792fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 79369962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, boolean_t labels) 794fa9e4066Sahrens { 795fa9e4066Sahrens zio_t *zio; 7960a4e9518Sgw 797e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 798e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 799e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 800e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 801fa9e4066Sahrens 802e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 803e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, vd, offset, NULL, 804fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); 805fa9e4066Sahrens 806e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 807fa9e4066Sahrens 808fa9e4066Sahrens return (zio); 809fa9e4066Sahrens } 810fa9e4066Sahrens 811fa9e4066Sahrens zio_t * 812fa9e4066Sahrens zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 813fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 81469962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, boolean_t labels) 815fa9e4066Sahrens { 816fa9e4066Sahrens zio_t *zio; 8170a4e9518Sgw 818e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 819e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 820e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 821e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 822fa9e4066Sahrens 823e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 824e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL, 825fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); 826fa9e4066Sahrens 827e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 828fa9e4066Sahrens 8296e1f5caaSNeil Perrin if (zio_checksum_table[checksum].ci_eck) { 830fa9e4066Sahrens /* 8316e1f5caaSNeil Perrin * zec checksums are necessarily destructive -- they modify 832e14bb325SJeff Bonwick * the end of the write buffer to hold the verifier/checksum. 833fa9e4066Sahrens * Therefore, we must make a local copy in case the data is 834e14bb325SJeff Bonwick * being written to multiple places in parallel. 835fa9e4066Sahrens */ 836e14bb325SJeff Bonwick void *wbuf = zio_buf_alloc(size); 837fa9e4066Sahrens bcopy(data, wbuf, size); 838e14bb325SJeff Bonwick zio_push_transform(zio, wbuf, size, size, NULL); 839fa9e4066Sahrens } 840fa9e4066Sahrens 841fa9e4066Sahrens return (zio); 842fa9e4066Sahrens } 843fa9e4066Sahrens 844fa9e4066Sahrens /* 845e14bb325SJeff Bonwick * Create a child I/O to do some work for us. 846fa9e4066Sahrens */ 847fa9e4066Sahrens zio_t * 848e14bb325SJeff Bonwick zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, 84969962b56SMatthew Ahrens void *data, uint64_t size, int type, zio_priority_t priority, 85069962b56SMatthew Ahrens enum zio_flag flags, zio_done_func_t *done, void *private) 851fa9e4066Sahrens { 852b24ab676SJeff Bonwick enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; 853e14bb325SJeff Bonwick zio_t *zio; 854e14bb325SJeff Bonwick 855e14bb325SJeff Bonwick ASSERT(vd->vdev_parent == 856e14bb325SJeff Bonwick (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); 857fa9e4066Sahrens 858fa9e4066Sahrens if (type == ZIO_TYPE_READ && bp != NULL) { 859fa9e4066Sahrens /* 860fa9e4066Sahrens * If we have the bp, then the child should perform the 861fa9e4066Sahrens * checksum and the parent need not. This pushes error 862fa9e4066Sahrens * detection as close to the leaves as possible and 863fa9e4066Sahrens * eliminates redundant checksums in the interior nodes. 864fa9e4066Sahrens */ 865b24ab676SJeff Bonwick pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; 866b24ab676SJeff Bonwick pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 867fa9e4066Sahrens } 868fa9e4066Sahrens 869e14bb325SJeff Bonwick if (vd->vdev_children == 0) 870e14bb325SJeff Bonwick offset += VDEV_LABEL_START_SIZE; 871e14bb325SJeff Bonwick 872b24ab676SJeff Bonwick flags |= ZIO_VDEV_CHILD_FLAGS(pio) | ZIO_FLAG_DONT_PROPAGATE; 873b24ab676SJeff Bonwick 874b24ab676SJeff Bonwick /* 875b24ab676SJeff Bonwick * If we've decided to do a repair, the write is not speculative -- 876b24ab676SJeff Bonwick * even if the original read was. 877b24ab676SJeff Bonwick */ 878b24ab676SJeff Bonwick if (flags & ZIO_FLAG_IO_REPAIR) 879b24ab676SJeff Bonwick flags &= ~ZIO_FLAG_SPECULATIVE; 880b24ab676SJeff Bonwick 881e14bb325SJeff Bonwick zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, 882b24ab676SJeff Bonwick done, private, type, priority, flags, vd, offset, &pio->io_bookmark, 883b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, pipeline); 884fa9e4066Sahrens 88569962b56SMatthew Ahrens zio->io_physdone = pio->io_physdone; 88669962b56SMatthew Ahrens if (vd->vdev_ops->vdev_op_leaf && zio->io_logical != NULL) 88769962b56SMatthew Ahrens zio->io_logical->io_phys_children++; 88869962b56SMatthew Ahrens 889e14bb325SJeff Bonwick return (zio); 89032b87932Sek } 89132b87932Sek 892e14bb325SJeff Bonwick zio_t * 893e14bb325SJeff Bonwick zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, 89469962b56SMatthew Ahrens int type, zio_priority_t priority, enum zio_flag flags, 895b24ab676SJeff Bonwick zio_done_func_t *done, void *private) 896fa9e4066Sahrens { 897e14bb325SJeff Bonwick zio_t *zio; 898fa9e4066Sahrens 899e14bb325SJeff Bonwick ASSERT(vd->vdev_ops->vdev_op_leaf); 900fa9e4066Sahrens 901e14bb325SJeff Bonwick zio = zio_create(NULL, vd->vdev_spa, 0, NULL, 902e14bb325SJeff Bonwick data, size, done, private, type, priority, 90369962b56SMatthew Ahrens flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY | ZIO_FLAG_DELEGATED, 904e14bb325SJeff Bonwick vd, offset, NULL, 905b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); 906fa9e4066Sahrens 907e14bb325SJeff Bonwick return (zio); 908e05725b1Sbonwick } 909e05725b1Sbonwick 910e05725b1Sbonwick void 911e14bb325SJeff Bonwick zio_flush(zio_t *zio, vdev_t *vd) 912e05725b1Sbonwick { 913e14bb325SJeff Bonwick zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, 91469962b56SMatthew Ahrens NULL, NULL, 915e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); 916fa9e4066Sahrens } 917fa9e4066Sahrens 9186e1f5caaSNeil Perrin void 9196e1f5caaSNeil Perrin zio_shrink(zio_t *zio, uint64_t size) 9206e1f5caaSNeil Perrin { 9216e1f5caaSNeil Perrin ASSERT(zio->io_executor == NULL); 9226e1f5caaSNeil Perrin ASSERT(zio->io_orig_size == zio->io_size); 9236e1f5caaSNeil Perrin ASSERT(size <= zio->io_size); 9246e1f5caaSNeil Perrin 9256e1f5caaSNeil Perrin /* 9266e1f5caaSNeil Perrin * We don't shrink for raidz because of problems with the 9276e1f5caaSNeil Perrin * reconstruction when reading back less than the block size. 9286e1f5caaSNeil Perrin * Note, BP_IS_RAIDZ() assumes no compression. 9296e1f5caaSNeil Perrin */ 9306e1f5caaSNeil Perrin ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); 9316e1f5caaSNeil Perrin if (!BP_IS_RAIDZ(zio->io_bp)) 9326e1f5caaSNeil Perrin zio->io_orig_size = zio->io_size = size; 9336e1f5caaSNeil Perrin } 9346e1f5caaSNeil Perrin 935fa9e4066Sahrens /* 936fa9e4066Sahrens * ========================================================================== 937e14bb325SJeff Bonwick * Prepare to read and write logical blocks 938fa9e4066Sahrens * ========================================================================== 939fa9e4066Sahrens */ 940e14bb325SJeff Bonwick 941e05725b1Sbonwick static int 942e14bb325SJeff Bonwick zio_read_bp_init(zio_t *zio) 943fa9e4066Sahrens { 944e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 945e05725b1Sbonwick 94603361682SJeff Bonwick if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && 947f5383399SBill Moore zio->io_child_type == ZIO_CHILD_LOGICAL && 948f5383399SBill Moore !(zio->io_flags & ZIO_FLAG_RAW)) { 949b24ab676SJeff Bonwick uint64_t psize = BP_GET_PSIZE(bp); 950b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(psize); 951e05725b1Sbonwick 952b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, psize, zio_decompress); 953e14bb325SJeff Bonwick } 954fa9e4066Sahrens 955ad135b5dSChristopher Siden if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) && BP_GET_LEVEL(bp) == 0) 956e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 957fa9e4066Sahrens 958bbfd46c4SJeff Bonwick if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) 959bbfd46c4SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 960bbfd46c4SJeff Bonwick 961b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) 962b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_READ_PIPELINE; 963b24ab676SJeff Bonwick 964e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 965fa9e4066Sahrens } 966fa9e4066Sahrens 967e05725b1Sbonwick static int 968e14bb325SJeff Bonwick zio_write_bp_init(zio_t *zio) 9690a4e9518Sgw { 970b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 971e14bb325SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 972b24ab676SJeff Bonwick enum zio_compress compress = zp->zp_compress; 973e05725b1Sbonwick blkptr_t *bp = zio->io_bp; 974e14bb325SJeff Bonwick uint64_t lsize = zio->io_size; 975b24ab676SJeff Bonwick uint64_t psize = lsize; 976e14bb325SJeff Bonwick int pass = 1; 977e05725b1Sbonwick 978e14bb325SJeff Bonwick /* 979e14bb325SJeff Bonwick * If our children haven't all reached the ready stage, 980e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 981e14bb325SJeff Bonwick */ 982e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 983e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) 984e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 9850a4e9518Sgw 986e14bb325SJeff Bonwick if (!IO_IS_ALLOCATING(zio)) 987e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 9880a4e9518Sgw 989b24ab676SJeff Bonwick ASSERT(zio->io_child_type != ZIO_CHILD_DDT); 990b24ab676SJeff Bonwick 991b24ab676SJeff Bonwick if (zio->io_bp_override) { 992b24ab676SJeff Bonwick ASSERT(bp->blk_birth != zio->io_txg); 993b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); 994b24ab676SJeff Bonwick 995b24ab676SJeff Bonwick *bp = *zio->io_bp_override; 996b24ab676SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 997b24ab676SJeff Bonwick 99880901aeaSGeorge Wilson /* 99980901aeaSGeorge Wilson * If we've been overridden and nopwrite is set then 100080901aeaSGeorge Wilson * set the flag accordingly to indicate that a nopwrite 100180901aeaSGeorge Wilson * has already occurred. 100280901aeaSGeorge Wilson */ 100380901aeaSGeorge Wilson if (!BP_IS_HOLE(bp) && zp->zp_nopwrite) { 100480901aeaSGeorge Wilson ASSERT(!zp->zp_dedup); 100580901aeaSGeorge Wilson zio->io_flags |= ZIO_FLAG_NOPWRITE; 100680901aeaSGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 100780901aeaSGeorge Wilson } 100880901aeaSGeorge Wilson 100980901aeaSGeorge Wilson ASSERT(!zp->zp_nopwrite); 101080901aeaSGeorge Wilson 1011b24ab676SJeff Bonwick if (BP_IS_HOLE(bp) || !zp->zp_dedup) 1012b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1013b24ab676SJeff Bonwick 1014b24ab676SJeff Bonwick ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup || 1015b24ab676SJeff Bonwick zp->zp_dedup_verify); 1016b24ab676SJeff Bonwick 1017b24ab676SJeff Bonwick if (BP_GET_CHECKSUM(bp) == zp->zp_checksum) { 1018b24ab676SJeff Bonwick BP_SET_DEDUP(bp, 1); 1019b24ab676SJeff Bonwick zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; 1020b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1021b24ab676SJeff Bonwick } 1022b24ab676SJeff Bonwick zio->io_bp_override = NULL; 1023b24ab676SJeff Bonwick BP_ZERO(bp); 1024b24ab676SJeff Bonwick } 10250a4e9518Sgw 1026*43466aaeSMax Grossman if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg) { 1027e14bb325SJeff Bonwick /* 1028e14bb325SJeff Bonwick * We're rewriting an existing block, which means we're 1029e14bb325SJeff Bonwick * working on behalf of spa_sync(). For spa_sync() to 1030e14bb325SJeff Bonwick * converge, it must eventually be the case that we don't 1031e14bb325SJeff Bonwick * have to allocate new blocks. But compression changes 1032e14bb325SJeff Bonwick * the blocksize, which forces a reallocate, and makes 1033e14bb325SJeff Bonwick * convergence take longer. Therefore, after the first 1034e14bb325SJeff Bonwick * few passes, stop compressing to ensure convergence. 1035e14bb325SJeff Bonwick */ 1036b24ab676SJeff Bonwick pass = spa_sync_pass(spa); 1037b24ab676SJeff Bonwick 1038b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(spa)); 1039b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1040b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp)); 1041e05725b1Sbonwick 104201f55e48SGeorge Wilson if (pass >= zfs_sync_pass_dont_compress) 1043e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 1044e05725b1Sbonwick 1045e14bb325SJeff Bonwick /* Make sure someone doesn't change their mind on overwrites */ 1046b24ab676SJeff Bonwick ASSERT(MIN(zp->zp_copies + BP_IS_GANG(bp), 1047b24ab676SJeff Bonwick spa_max_replication(spa)) == BP_GET_NDVAS(bp)); 1048e14bb325SJeff Bonwick } 1049fa9e4066Sahrens 1050e14bb325SJeff Bonwick if (compress != ZIO_COMPRESS_OFF) { 1051b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(lsize); 1052b24ab676SJeff Bonwick psize = zio_compress_data(compress, zio->io_data, cbuf, lsize); 1053b24ab676SJeff Bonwick if (psize == 0 || psize == lsize) { 1054e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 1055b24ab676SJeff Bonwick zio_buf_free(cbuf, lsize); 1056b24ab676SJeff Bonwick } else { 1057b24ab676SJeff Bonwick ASSERT(psize < lsize); 1058b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, lsize, NULL); 1059e14bb325SJeff Bonwick } 1060e14bb325SJeff Bonwick } 1061c717a561Smaybee 1062e14bb325SJeff Bonwick /* 1063e14bb325SJeff Bonwick * The final pass of spa_sync() must be all rewrites, but the first 1064e14bb325SJeff Bonwick * few passes offer a trade-off: allocating blocks defers convergence, 1065e14bb325SJeff Bonwick * but newly allocated blocks are sequential, so they can be written 1066e14bb325SJeff Bonwick * to disk faster. Therefore, we allow the first few passes of 1067e14bb325SJeff Bonwick * spa_sync() to allocate new blocks, but force rewrites after that. 1068e14bb325SJeff Bonwick * There should only be a handful of blocks after pass 1 in any case. 1069e14bb325SJeff Bonwick */ 1070*43466aaeSMax Grossman if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg && 1071*43466aaeSMax Grossman BP_GET_PSIZE(bp) == psize && 107201f55e48SGeorge Wilson pass >= zfs_sync_pass_rewrite) { 1073b24ab676SJeff Bonwick ASSERT(psize != 0); 1074b24ab676SJeff Bonwick enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; 1075e14bb325SJeff Bonwick zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; 1076e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_REWRITE; 1077e14bb325SJeff Bonwick } else { 1078e14bb325SJeff Bonwick BP_ZERO(bp); 1079e14bb325SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 1080e14bb325SJeff Bonwick } 1081fa9e4066Sahrens 1082b24ab676SJeff Bonwick if (psize == 0) { 1083*43466aaeSMax Grossman if (zio->io_bp_orig.blk_birth != 0 && 1084*43466aaeSMax Grossman spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { 1085*43466aaeSMax Grossman BP_SET_LSIZE(bp, lsize); 1086*43466aaeSMax Grossman BP_SET_TYPE(bp, zp->zp_type); 1087*43466aaeSMax Grossman BP_SET_LEVEL(bp, zp->zp_level); 1088*43466aaeSMax Grossman BP_SET_BIRTH(bp, zio->io_txg, 0); 1089*43466aaeSMax Grossman } 1090e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1091e14bb325SJeff Bonwick } else { 1092e14bb325SJeff Bonwick ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); 1093e14bb325SJeff Bonwick BP_SET_LSIZE(bp, lsize); 1094*43466aaeSMax Grossman BP_SET_TYPE(bp, zp->zp_type); 1095*43466aaeSMax Grossman BP_SET_LEVEL(bp, zp->zp_level); 1096b24ab676SJeff Bonwick BP_SET_PSIZE(bp, psize); 1097e14bb325SJeff Bonwick BP_SET_COMPRESS(bp, compress); 1098e14bb325SJeff Bonwick BP_SET_CHECKSUM(bp, zp->zp_checksum); 1099b24ab676SJeff Bonwick BP_SET_DEDUP(bp, zp->zp_dedup); 1100e14bb325SJeff Bonwick BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 1101b24ab676SJeff Bonwick if (zp->zp_dedup) { 1102b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1103b24ab676SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 1104b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; 1105b24ab676SJeff Bonwick } 110680901aeaSGeorge Wilson if (zp->zp_nopwrite) { 110780901aeaSGeorge Wilson ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 110880901aeaSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 110980901aeaSGeorge Wilson zio->io_pipeline |= ZIO_STAGE_NOP_WRITE; 111080901aeaSGeorge Wilson } 1111b24ab676SJeff Bonwick } 1112b24ab676SJeff Bonwick 1113b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1114b24ab676SJeff Bonwick } 1115b24ab676SJeff Bonwick 1116b24ab676SJeff Bonwick static int 1117b24ab676SJeff Bonwick zio_free_bp_init(zio_t *zio) 1118b24ab676SJeff Bonwick { 1119b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1120b24ab676SJeff Bonwick 1121b24ab676SJeff Bonwick if (zio->io_child_type == ZIO_CHILD_LOGICAL) { 1122b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp)) 1123b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; 1124e14bb325SJeff Bonwick } 1125fa9e4066Sahrens 1126e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1127fa9e4066Sahrens } 1128fa9e4066Sahrens 1129e14bb325SJeff Bonwick /* 1130e14bb325SJeff Bonwick * ========================================================================== 1131e14bb325SJeff Bonwick * Execute the I/O pipeline 1132e14bb325SJeff Bonwick * ========================================================================== 1133e14bb325SJeff Bonwick */ 1134e14bb325SJeff Bonwick 1135e14bb325SJeff Bonwick static void 1136ec94d322SAdam Leventhal zio_taskq_dispatch(zio_t *zio, zio_taskq_type_t q, boolean_t cutinline) 1137fa9e4066Sahrens { 113880eb36f2SGeorge Wilson spa_t *spa = zio->io_spa; 1139e14bb325SJeff Bonwick zio_type_t t = zio->io_type; 11405aeb9474SGarrett D'Amore int flags = (cutinline ? TQ_FRONT : 0); 11410a4e9518Sgw 11420a4e9518Sgw /* 1143bbe36defSGeorge Wilson * If we're a config writer or a probe, the normal issue and 1144bbe36defSGeorge Wilson * interrupt threads may all be blocked waiting for the config lock. 1145bbe36defSGeorge Wilson * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. 11460a4e9518Sgw */ 1147bbe36defSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) 1148e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 11490a4e9518Sgw 11500a4e9518Sgw /* 1151e14bb325SJeff Bonwick * A similar issue exists for the L2ARC write thread until L2ARC 2.0. 11520a4e9518Sgw */ 1153e14bb325SJeff Bonwick if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) 1154e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 11550a4e9518Sgw 115680eb36f2SGeorge Wilson /* 1157ec94d322SAdam Leventhal * If this is a high priority I/O, then use the high priority taskq if 1158ec94d322SAdam Leventhal * available. 115980eb36f2SGeorge Wilson */ 116080eb36f2SGeorge Wilson if (zio->io_priority == ZIO_PRIORITY_NOW && 1161ec94d322SAdam Leventhal spa->spa_zio_taskq[t][q + 1].stqs_count != 0) 116280eb36f2SGeorge Wilson q++; 116380eb36f2SGeorge Wilson 116480eb36f2SGeorge Wilson ASSERT3U(q, <, ZIO_TASKQ_TYPES); 11655aeb9474SGarrett D'Amore 11665aeb9474SGarrett D'Amore /* 11675aeb9474SGarrett D'Amore * NB: We are assuming that the zio can only be dispatched 11685aeb9474SGarrett D'Amore * to a single taskq at a time. It would be a grievous error 11695aeb9474SGarrett D'Amore * to dispatch the zio to another taskq at the same time. 11705aeb9474SGarrett D'Amore */ 11715aeb9474SGarrett D'Amore ASSERT(zio->io_tqent.tqent_next == NULL); 1172ec94d322SAdam Leventhal spa_taskq_dispatch_ent(spa, t, q, (task_func_t *)zio_execute, zio, 1173ec94d322SAdam Leventhal flags, &zio->io_tqent); 1174e14bb325SJeff Bonwick } 11750a4e9518Sgw 1176e14bb325SJeff Bonwick static boolean_t 1177ec94d322SAdam Leventhal zio_taskq_member(zio_t *zio, zio_taskq_type_t q) 1178e14bb325SJeff Bonwick { 1179e14bb325SJeff Bonwick kthread_t *executor = zio->io_executor; 1180e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 11810a4e9518Sgw 1182ec94d322SAdam Leventhal for (zio_type_t t = 0; t < ZIO_TYPES; t++) { 1183ec94d322SAdam Leventhal spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 1184ec94d322SAdam Leventhal uint_t i; 1185ec94d322SAdam Leventhal for (i = 0; i < tqs->stqs_count; i++) { 1186ec94d322SAdam Leventhal if (taskq_member(tqs->stqs_taskq[i], executor)) 1187ec94d322SAdam Leventhal return (B_TRUE); 1188ec94d322SAdam Leventhal } 1189ec94d322SAdam Leventhal } 11900a4e9518Sgw 1191e14bb325SJeff Bonwick return (B_FALSE); 1192e14bb325SJeff Bonwick } 1193e05725b1Sbonwick 1194e14bb325SJeff Bonwick static int 1195e14bb325SJeff Bonwick zio_issue_async(zio_t *zio) 1196e14bb325SJeff Bonwick { 119735a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 1198e14bb325SJeff Bonwick 1199e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 12000a4e9518Sgw } 12010a4e9518Sgw 1202e14bb325SJeff Bonwick void 1203e14bb325SJeff Bonwick zio_interrupt(zio_t *zio) 12040a4e9518Sgw { 120535a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE); 1206e14bb325SJeff Bonwick } 12070a4e9518Sgw 1208e14bb325SJeff Bonwick /* 1209e14bb325SJeff Bonwick * Execute the I/O pipeline until one of the following occurs: 1210f7170741SWill Andrews * 1211f7170741SWill Andrews * (1) the I/O completes 1212f7170741SWill Andrews * (2) the pipeline stalls waiting for dependent child I/Os 1213f7170741SWill Andrews * (3) the I/O issues, so we're waiting for an I/O completion interrupt 1214f7170741SWill Andrews * (4) the I/O is delegated by vdev-level caching or aggregation 1215f7170741SWill Andrews * (5) the I/O is deferred due to vdev-level queueing 1216f7170741SWill Andrews * (6) the I/O is handed off to another thread. 1217f7170741SWill Andrews * 1218f7170741SWill Andrews * In all cases, the pipeline stops whenever there's no CPU work; it never 1219f7170741SWill Andrews * burns a thread in cv_wait(). 1220e14bb325SJeff Bonwick * 1221e14bb325SJeff Bonwick * There's no locking on io_stage because there's no legitimate way 1222e14bb325SJeff Bonwick * for multiple threads to be attempting to process the same I/O. 1223e14bb325SJeff Bonwick */ 1224b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[]; 12250a4e9518Sgw 1226e14bb325SJeff Bonwick void 1227e14bb325SJeff Bonwick zio_execute(zio_t *zio) 1228e14bb325SJeff Bonwick { 1229e14bb325SJeff Bonwick zio->io_executor = curthread; 12300a4e9518Sgw 1231e14bb325SJeff Bonwick while (zio->io_stage < ZIO_STAGE_DONE) { 1232b24ab676SJeff Bonwick enum zio_stage pipeline = zio->io_pipeline; 1233b24ab676SJeff Bonwick enum zio_stage stage = zio->io_stage; 1234e14bb325SJeff Bonwick int rv; 12350a4e9518Sgw 1236e14bb325SJeff Bonwick ASSERT(!MUTEX_HELD(&zio->io_lock)); 1237b24ab676SJeff Bonwick ASSERT(ISP2(stage)); 1238b24ab676SJeff Bonwick ASSERT(zio->io_stall == NULL); 12390a4e9518Sgw 1240b24ab676SJeff Bonwick do { 1241b24ab676SJeff Bonwick stage <<= 1; 1242b24ab676SJeff Bonwick } while ((stage & pipeline) == 0); 1243e14bb325SJeff Bonwick 1244e14bb325SJeff Bonwick ASSERT(stage <= ZIO_STAGE_DONE); 12450a4e9518Sgw 12460a4e9518Sgw /* 1247e14bb325SJeff Bonwick * If we are in interrupt context and this pipeline stage 1248e14bb325SJeff Bonwick * will grab a config lock that is held across I/O, 1249b24ab676SJeff Bonwick * or may wait for an I/O that needs an interrupt thread 1250b24ab676SJeff Bonwick * to complete, issue async to avoid deadlock. 125135a5a358SJonathan Adams * 125235a5a358SJonathan Adams * For VDEV_IO_START, we cut in line so that the io will 125335a5a358SJonathan Adams * be sent to disk promptly. 12540a4e9518Sgw */ 1255b24ab676SJeff Bonwick if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && 1256e14bb325SJeff Bonwick zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { 125735a5a358SJonathan Adams boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ? 125835a5a358SJonathan Adams zio_requeue_io_start_cut_in_line : B_FALSE; 125935a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); 1260e14bb325SJeff Bonwick return; 12610a4e9518Sgw } 12620a4e9518Sgw 1263e14bb325SJeff Bonwick zio->io_stage = stage; 1264b24ab676SJeff Bonwick rv = zio_pipeline[highbit(stage) - 1](zio); 12650a4e9518Sgw 1266e14bb325SJeff Bonwick if (rv == ZIO_PIPELINE_STOP) 1267e14bb325SJeff Bonwick return; 12680a4e9518Sgw 1269e14bb325SJeff Bonwick ASSERT(rv == ZIO_PIPELINE_CONTINUE); 1270e14bb325SJeff Bonwick } 12710a4e9518Sgw } 12720a4e9518Sgw 1273e14bb325SJeff Bonwick /* 1274e14bb325SJeff Bonwick * ========================================================================== 1275e14bb325SJeff Bonwick * Initiate I/O, either sync or async 1276e14bb325SJeff Bonwick * ========================================================================== 1277e14bb325SJeff Bonwick */ 1278e14bb325SJeff Bonwick int 1279e14bb325SJeff Bonwick zio_wait(zio_t *zio) 12800a4e9518Sgw { 1281e14bb325SJeff Bonwick int error; 12820a4e9518Sgw 1283e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 1284e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 12850a4e9518Sgw 1286e14bb325SJeff Bonwick zio->io_waiter = curthread; 1287e05725b1Sbonwick 1288e14bb325SJeff Bonwick zio_execute(zio); 12890a4e9518Sgw 1290e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 1291e14bb325SJeff Bonwick while (zio->io_executor != NULL) 1292e14bb325SJeff Bonwick cv_wait(&zio->io_cv, &zio->io_lock); 1293e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 129432b87932Sek 1295e14bb325SJeff Bonwick error = zio->io_error; 1296e14bb325SJeff Bonwick zio_destroy(zio); 129732b87932Sek 1298e14bb325SJeff Bonwick return (error); 129932b87932Sek } 130032b87932Sek 1301e14bb325SJeff Bonwick void 1302e14bb325SJeff Bonwick zio_nowait(zio_t *zio) 13030a4e9518Sgw { 1304e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 1305fa9e4066Sahrens 1306a3f829aeSBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL && 1307a3f829aeSBill Moore zio_unique_parent(zio) == NULL) { 1308ea8dc4b6Seschrock /* 1309e14bb325SJeff Bonwick * This is a logical async I/O with no parent to wait for it. 131054d692b7SGeorge Wilson * We add it to the spa_async_root_zio "Godfather" I/O which 131154d692b7SGeorge Wilson * will ensure they complete prior to unloading the pool. 1312ea8dc4b6Seschrock */ 1313e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 131454d692b7SGeorge Wilson 131554d692b7SGeorge Wilson zio_add_child(spa->spa_async_zio_root, zio); 1316e14bb325SJeff Bonwick } 1317ea8dc4b6Seschrock 1318e14bb325SJeff Bonwick zio_execute(zio); 1319e14bb325SJeff Bonwick } 1320ea8dc4b6Seschrock 1321e14bb325SJeff Bonwick /* 1322e14bb325SJeff Bonwick * ========================================================================== 1323e14bb325SJeff Bonwick * Reexecute or suspend/resume failed I/O 1324e14bb325SJeff Bonwick * ========================================================================== 1325e14bb325SJeff Bonwick */ 1326fa9e4066Sahrens 1327e14bb325SJeff Bonwick static void 1328e14bb325SJeff Bonwick zio_reexecute(zio_t *pio) 1329e14bb325SJeff Bonwick { 1330a3f829aeSBill Moore zio_t *cio, *cio_next; 1331a3f829aeSBill Moore 1332a3f829aeSBill Moore ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); 1333a3f829aeSBill Moore ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); 1334f5383399SBill Moore ASSERT(pio->io_gang_leader == NULL); 1335f5383399SBill Moore ASSERT(pio->io_gang_tree == NULL); 1336e05725b1Sbonwick 1337e14bb325SJeff Bonwick pio->io_flags = pio->io_orig_flags; 1338e14bb325SJeff Bonwick pio->io_stage = pio->io_orig_stage; 1339e14bb325SJeff Bonwick pio->io_pipeline = pio->io_orig_pipeline; 1340e14bb325SJeff Bonwick pio->io_reexecute = 0; 134180901aeaSGeorge Wilson pio->io_flags |= ZIO_FLAG_REEXECUTED; 1342e14bb325SJeff Bonwick pio->io_error = 0; 1343a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1344a3f829aeSBill Moore pio->io_state[w] = 0; 1345e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 1346e14bb325SJeff Bonwick pio->io_child_error[c] = 0; 13470a4e9518Sgw 1348b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(pio)) 1349b24ab676SJeff Bonwick BP_ZERO(pio->io_bp); 1350d58459f4Sek 1351e14bb325SJeff Bonwick /* 1352e14bb325SJeff Bonwick * As we reexecute pio's children, new children could be created. 1353a3f829aeSBill Moore * New children go to the head of pio's io_child_list, however, 1354e14bb325SJeff Bonwick * so we will (correctly) not reexecute them. The key is that 1355a3f829aeSBill Moore * the remainder of pio's io_child_list, from 'cio_next' onward, 1356a3f829aeSBill Moore * cannot be affected by any side effects of reexecuting 'cio'. 1357e14bb325SJeff Bonwick */ 1358a3f829aeSBill Moore for (cio = zio_walk_children(pio); cio != NULL; cio = cio_next) { 1359a3f829aeSBill Moore cio_next = zio_walk_children(pio); 1360e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 1361a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1362a3f829aeSBill Moore pio->io_children[cio->io_child_type][w]++; 1363e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 1364a3f829aeSBill Moore zio_reexecute(cio); 1365fa9e4066Sahrens } 1366e05725b1Sbonwick 1367e14bb325SJeff Bonwick /* 1368e14bb325SJeff Bonwick * Now that all children have been reexecuted, execute the parent. 136954d692b7SGeorge Wilson * We don't reexecute "The Godfather" I/O here as it's the 137054d692b7SGeorge Wilson * responsibility of the caller to wait on him. 1371e14bb325SJeff Bonwick */ 137254d692b7SGeorge Wilson if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) 137354d692b7SGeorge Wilson zio_execute(pio); 13740a4e9518Sgw } 13750a4e9518Sgw 1376e14bb325SJeff Bonwick void 1377e14bb325SJeff Bonwick zio_suspend(spa_t *spa, zio_t *zio) 13780a4e9518Sgw { 1379e14bb325SJeff Bonwick if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) 1380e14bb325SJeff Bonwick fm_panic("Pool '%s' has encountered an uncorrectable I/O " 1381e14bb325SJeff Bonwick "failure and the failure mode property for this pool " 1382e14bb325SJeff Bonwick "is set to panic.", spa_name(spa)); 13830a4e9518Sgw 1384e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); 13850a4e9518Sgw 1386e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1387fa9e4066Sahrens 1388e14bb325SJeff Bonwick if (spa->spa_suspend_zio_root == NULL) 138954d692b7SGeorge Wilson spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, 139054d692b7SGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 139154d692b7SGeorge Wilson ZIO_FLAG_GODFATHER); 1392fa9e4066Sahrens 1393e14bb325SJeff Bonwick spa->spa_suspended = B_TRUE; 1394fa9e4066Sahrens 1395e14bb325SJeff Bonwick if (zio != NULL) { 139654d692b7SGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 1397e14bb325SJeff Bonwick ASSERT(zio != spa->spa_suspend_zio_root); 1398e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1399a3f829aeSBill Moore ASSERT(zio_unique_parent(zio) == NULL); 1400e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_DONE); 1401e14bb325SJeff Bonwick zio_add_child(spa->spa_suspend_zio_root, zio); 1402e14bb325SJeff Bonwick } 1403fa9e4066Sahrens 1404e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1405e14bb325SJeff Bonwick } 1406fa9e4066Sahrens 140754d692b7SGeorge Wilson int 1408e14bb325SJeff Bonwick zio_resume(spa_t *spa) 1409e14bb325SJeff Bonwick { 141054d692b7SGeorge Wilson zio_t *pio; 1411fa9e4066Sahrens 1412b3995adbSahrens /* 1413e14bb325SJeff Bonwick * Reexecute all previously suspended i/o. 1414b3995adbSahrens */ 1415e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1416e14bb325SJeff Bonwick spa->spa_suspended = B_FALSE; 1417e14bb325SJeff Bonwick cv_broadcast(&spa->spa_suspend_cv); 1418e14bb325SJeff Bonwick pio = spa->spa_suspend_zio_root; 1419e14bb325SJeff Bonwick spa->spa_suspend_zio_root = NULL; 1420e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1421e14bb325SJeff Bonwick 1422e14bb325SJeff Bonwick if (pio == NULL) 142354d692b7SGeorge Wilson return (0); 1424e14bb325SJeff Bonwick 142554d692b7SGeorge Wilson zio_reexecute(pio); 142654d692b7SGeorge Wilson return (zio_wait(pio)); 1427e14bb325SJeff Bonwick } 1428e14bb325SJeff Bonwick 1429e14bb325SJeff Bonwick void 1430e14bb325SJeff Bonwick zio_resume_wait(spa_t *spa) 1431e14bb325SJeff Bonwick { 1432e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1433e14bb325SJeff Bonwick while (spa_suspended(spa)) 1434e14bb325SJeff Bonwick cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); 1435e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1436fa9e4066Sahrens } 1437fa9e4066Sahrens 1438fa9e4066Sahrens /* 1439fa9e4066Sahrens * ========================================================================== 1440e14bb325SJeff Bonwick * Gang blocks. 1441e14bb325SJeff Bonwick * 1442e14bb325SJeff Bonwick * A gang block is a collection of small blocks that looks to the DMU 1443e14bb325SJeff Bonwick * like one large block. When zio_dva_allocate() cannot find a block 1444e14bb325SJeff Bonwick * of the requested size, due to either severe fragmentation or the pool 1445e14bb325SJeff Bonwick * being nearly full, it calls zio_write_gang_block() to construct the 1446e14bb325SJeff Bonwick * block from smaller fragments. 1447e14bb325SJeff Bonwick * 1448e14bb325SJeff Bonwick * A gang block consists of a gang header (zio_gbh_phys_t) and up to 1449e14bb325SJeff Bonwick * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like 1450e14bb325SJeff Bonwick * an indirect block: it's an array of block pointers. It consumes 1451e14bb325SJeff Bonwick * only one sector and hence is allocatable regardless of fragmentation. 1452e14bb325SJeff Bonwick * The gang header's bps point to its gang members, which hold the data. 1453e14bb325SJeff Bonwick * 1454e14bb325SJeff Bonwick * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> 1455e14bb325SJeff Bonwick * as the verifier to ensure uniqueness of the SHA256 checksum. 1456e14bb325SJeff Bonwick * Critically, the gang block bp's blk_cksum is the checksum of the data, 1457e14bb325SJeff Bonwick * not the gang header. This ensures that data block signatures (needed for 1458e14bb325SJeff Bonwick * deduplication) are independent of how the block is physically stored. 1459e14bb325SJeff Bonwick * 1460e14bb325SJeff Bonwick * Gang blocks can be nested: a gang member may itself be a gang block. 1461e14bb325SJeff Bonwick * Thus every gang block is a tree in which root and all interior nodes are 1462e14bb325SJeff Bonwick * gang headers, and the leaves are normal blocks that contain user data. 1463e14bb325SJeff Bonwick * The root of the gang tree is called the gang leader. 1464e14bb325SJeff Bonwick * 1465e14bb325SJeff Bonwick * To perform any operation (read, rewrite, free, claim) on a gang block, 1466e14bb325SJeff Bonwick * zio_gang_assemble() first assembles the gang tree (minus data leaves) 1467e14bb325SJeff Bonwick * in the io_gang_tree field of the original logical i/o by recursively 1468e14bb325SJeff Bonwick * reading the gang leader and all gang headers below it. This yields 1469e14bb325SJeff Bonwick * an in-core tree containing the contents of every gang header and the 1470e14bb325SJeff Bonwick * bps for every constituent of the gang block. 1471e14bb325SJeff Bonwick * 1472e14bb325SJeff Bonwick * With the gang tree now assembled, zio_gang_issue() just walks the gang tree 1473e14bb325SJeff Bonwick * and invokes a callback on each bp. To free a gang block, zio_gang_issue() 1474e14bb325SJeff Bonwick * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. 1475e14bb325SJeff Bonwick * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). 1476e14bb325SJeff Bonwick * zio_read_gang() is a wrapper around zio_read() that omits reading gang 1477e14bb325SJeff Bonwick * headers, since we already have those in io_gang_tree. zio_rewrite_gang() 1478e14bb325SJeff Bonwick * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() 1479e14bb325SJeff Bonwick * of the gang header plus zio_checksum_compute() of the data to update the 1480e14bb325SJeff Bonwick * gang header's blk_cksum as described above. 1481e14bb325SJeff Bonwick * 1482e14bb325SJeff Bonwick * The two-phase assemble/issue model solves the problem of partial failure -- 1483e14bb325SJeff Bonwick * what if you'd freed part of a gang block but then couldn't read the 1484e14bb325SJeff Bonwick * gang header for another part? Assembling the entire gang tree first 1485e14bb325SJeff Bonwick * ensures that all the necessary gang header I/O has succeeded before 1486e14bb325SJeff Bonwick * starting the actual work of free, claim, or write. Once the gang tree 1487e14bb325SJeff Bonwick * is assembled, free and claim are in-memory operations that cannot fail. 1488e14bb325SJeff Bonwick * 1489e14bb325SJeff Bonwick * In the event that a gang write fails, zio_dva_unallocate() walks the 1490e14bb325SJeff Bonwick * gang tree to immediately free (i.e. insert back into the space map) 1491e14bb325SJeff Bonwick * everything we've allocated. This ensures that we don't get ENOSPC 1492e14bb325SJeff Bonwick * errors during repeated suspend/resume cycles due to a flaky device. 1493e14bb325SJeff Bonwick * 1494e14bb325SJeff Bonwick * Gang rewrites only happen during sync-to-convergence. If we can't assemble 1495e14bb325SJeff Bonwick * the gang tree, we won't modify the block, so we can safely defer the free 1496e14bb325SJeff Bonwick * (knowing that the block is still intact). If we *can* assemble the gang 1497e14bb325SJeff Bonwick * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free 1498e14bb325SJeff Bonwick * each constituent bp and we can allocate a new block on the next sync pass. 1499e14bb325SJeff Bonwick * 1500e14bb325SJeff Bonwick * In all cases, the gang tree allows complete recovery from partial failure. 1501fa9e4066Sahrens * ========================================================================== 1502fa9e4066Sahrens */ 1503e14bb325SJeff Bonwick 1504e14bb325SJeff Bonwick static zio_t * 1505e14bb325SJeff Bonwick zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1506fa9e4066Sahrens { 1507e14bb325SJeff Bonwick if (gn != NULL) 1508e14bb325SJeff Bonwick return (pio); 1509fa9e4066Sahrens 1510e14bb325SJeff Bonwick return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), 1511e14bb325SJeff Bonwick NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1512e14bb325SJeff Bonwick &pio->io_bookmark)); 1513e14bb325SJeff Bonwick } 1514e14bb325SJeff Bonwick 1515e14bb325SJeff Bonwick zio_t * 1516e14bb325SJeff Bonwick zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1517e14bb325SJeff Bonwick { 1518e14bb325SJeff Bonwick zio_t *zio; 1519e14bb325SJeff Bonwick 1520e14bb325SJeff Bonwick if (gn != NULL) { 1521e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1522e14bb325SJeff Bonwick gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, 1523e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1524fa9e4066Sahrens /* 1525e14bb325SJeff Bonwick * As we rewrite each gang header, the pipeline will compute 1526e14bb325SJeff Bonwick * a new gang block header checksum for it; but no one will 1527e14bb325SJeff Bonwick * compute a new data checksum, so we do that here. The one 1528e14bb325SJeff Bonwick * exception is the gang leader: the pipeline already computed 1529e14bb325SJeff Bonwick * its data checksum because that stage precedes gang assembly. 1530e14bb325SJeff Bonwick * (Presently, nothing actually uses interior data checksums; 1531e14bb325SJeff Bonwick * this is just good hygiene.) 1532fa9e4066Sahrens */ 1533f5383399SBill Moore if (gn != pio->io_gang_leader->io_gang_tree) { 1534e14bb325SJeff Bonwick zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), 1535e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp)); 1536e14bb325SJeff Bonwick } 1537b24ab676SJeff Bonwick /* 1538b24ab676SJeff Bonwick * If we are here to damage data for testing purposes, 1539b24ab676SJeff Bonwick * leave the GBH alone so that we can detect the damage. 1540b24ab676SJeff Bonwick */ 1541b24ab676SJeff Bonwick if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) 1542b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 1543fa9e4066Sahrens } else { 1544e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1545e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, 1546e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1547fa9e4066Sahrens } 1548fa9e4066Sahrens 1549e14bb325SJeff Bonwick return (zio); 1550e14bb325SJeff Bonwick } 1551fa9e4066Sahrens 1552e14bb325SJeff Bonwick /* ARGSUSED */ 1553e14bb325SJeff Bonwick zio_t * 1554e14bb325SJeff Bonwick zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1555e14bb325SJeff Bonwick { 1556b24ab676SJeff Bonwick return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, 1557b24ab676SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio))); 1558fa9e4066Sahrens } 1559fa9e4066Sahrens 1560e14bb325SJeff Bonwick /* ARGSUSED */ 1561e14bb325SJeff Bonwick zio_t * 1562e14bb325SJeff Bonwick zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1563fa9e4066Sahrens { 1564e14bb325SJeff Bonwick return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, 1565e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 1566e14bb325SJeff Bonwick } 1567fa9e4066Sahrens 1568e14bb325SJeff Bonwick static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { 1569e14bb325SJeff Bonwick NULL, 1570e14bb325SJeff Bonwick zio_read_gang, 1571e14bb325SJeff Bonwick zio_rewrite_gang, 1572e14bb325SJeff Bonwick zio_free_gang, 1573e14bb325SJeff Bonwick zio_claim_gang, 1574e14bb325SJeff Bonwick NULL 1575e14bb325SJeff Bonwick }; 1576fa9e4066Sahrens 1577e14bb325SJeff Bonwick static void zio_gang_tree_assemble_done(zio_t *zio); 1578fa9e4066Sahrens 1579e14bb325SJeff Bonwick static zio_gang_node_t * 1580e14bb325SJeff Bonwick zio_gang_node_alloc(zio_gang_node_t **gnpp) 1581e14bb325SJeff Bonwick { 1582e14bb325SJeff Bonwick zio_gang_node_t *gn; 1583fa9e4066Sahrens 1584e14bb325SJeff Bonwick ASSERT(*gnpp == NULL); 1585fa9e4066Sahrens 1586e14bb325SJeff Bonwick gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); 1587e14bb325SJeff Bonwick gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); 1588e14bb325SJeff Bonwick *gnpp = gn; 1589e14bb325SJeff Bonwick 1590e14bb325SJeff Bonwick return (gn); 1591fa9e4066Sahrens } 1592fa9e4066Sahrens 1593fa9e4066Sahrens static void 1594e14bb325SJeff Bonwick zio_gang_node_free(zio_gang_node_t **gnpp) 1595fa9e4066Sahrens { 1596e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1597fa9e4066Sahrens 1598e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1599e14bb325SJeff Bonwick ASSERT(gn->gn_child[g] == NULL); 1600e14bb325SJeff Bonwick 1601e14bb325SJeff Bonwick zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); 1602e14bb325SJeff Bonwick kmem_free(gn, sizeof (*gn)); 1603e14bb325SJeff Bonwick *gnpp = NULL; 1604fa9e4066Sahrens } 1605fa9e4066Sahrens 1606e14bb325SJeff Bonwick static void 1607e14bb325SJeff Bonwick zio_gang_tree_free(zio_gang_node_t **gnpp) 1608fa9e4066Sahrens { 1609e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1610fa9e4066Sahrens 1611e14bb325SJeff Bonwick if (gn == NULL) 1612e14bb325SJeff Bonwick return; 1613fa9e4066Sahrens 1614e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1615e14bb325SJeff Bonwick zio_gang_tree_free(&gn->gn_child[g]); 1616fa9e4066Sahrens 1617e14bb325SJeff Bonwick zio_gang_node_free(gnpp); 1618fa9e4066Sahrens } 1619fa9e4066Sahrens 1620e14bb325SJeff Bonwick static void 1621f5383399SBill Moore zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) 1622fa9e4066Sahrens { 1623e14bb325SJeff Bonwick zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); 1624e14bb325SJeff Bonwick 1625f5383399SBill Moore ASSERT(gio->io_gang_leader == gio); 1626e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp)); 1627fa9e4066Sahrens 1628f5383399SBill Moore zio_nowait(zio_read(gio, gio->io_spa, bp, gn->gn_gbh, 1629e14bb325SJeff Bonwick SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, 1630f5383399SBill Moore gio->io_priority, ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); 1631e14bb325SJeff Bonwick } 1632fa9e4066Sahrens 1633e14bb325SJeff Bonwick static void 1634e14bb325SJeff Bonwick zio_gang_tree_assemble_done(zio_t *zio) 1635e14bb325SJeff Bonwick { 1636f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 1637e14bb325SJeff Bonwick zio_gang_node_t *gn = zio->io_private; 1638e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1639fa9e4066Sahrens 1640f5383399SBill Moore ASSERT(gio == zio_unique_parent(zio)); 1641b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 1642fa9e4066Sahrens 1643e14bb325SJeff Bonwick if (zio->io_error) 1644e14bb325SJeff Bonwick return; 1645fa9e4066Sahrens 1646e14bb325SJeff Bonwick if (BP_SHOULD_BYTESWAP(bp)) 1647e14bb325SJeff Bonwick byteswap_uint64_array(zio->io_data, zio->io_size); 1648fa9e4066Sahrens 1649e14bb325SJeff Bonwick ASSERT(zio->io_data == gn->gn_gbh); 1650e14bb325SJeff Bonwick ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); 16516e1f5caaSNeil Perrin ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); 1652e05725b1Sbonwick 1653e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1654e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1655e14bb325SJeff Bonwick if (!BP_IS_GANG(gbp)) 1656e14bb325SJeff Bonwick continue; 1657f5383399SBill Moore zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); 1658e14bb325SJeff Bonwick } 1659fa9e4066Sahrens } 1660fa9e4066Sahrens 1661e14bb325SJeff Bonwick static void 1662e14bb325SJeff Bonwick zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) 1663fa9e4066Sahrens { 1664f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1665e14bb325SJeff Bonwick zio_t *zio; 1666fa9e4066Sahrens 1667e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) == !!gn); 1668f5383399SBill Moore ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); 1669f5383399SBill Moore ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); 1670fa9e4066Sahrens 1671e14bb325SJeff Bonwick /* 1672e14bb325SJeff Bonwick * If you're a gang header, your data is in gn->gn_gbh. 1673e14bb325SJeff Bonwick * If you're a gang member, your data is in 'data' and gn == NULL. 1674e14bb325SJeff Bonwick */ 1675f5383399SBill Moore zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data); 1676fa9e4066Sahrens 1677e14bb325SJeff Bonwick if (gn != NULL) { 16786e1f5caaSNeil Perrin ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); 1679fa9e4066Sahrens 1680e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1681e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1682e14bb325SJeff Bonwick if (BP_IS_HOLE(gbp)) 1683e14bb325SJeff Bonwick continue; 1684e14bb325SJeff Bonwick zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); 1685e14bb325SJeff Bonwick data = (char *)data + BP_GET_PSIZE(gbp); 1686e14bb325SJeff Bonwick } 1687fa9e4066Sahrens } 1688fa9e4066Sahrens 1689f5383399SBill Moore if (gn == gio->io_gang_tree) 1690f5383399SBill Moore ASSERT3P((char *)gio->io_data + gio->io_size, ==, data); 1691e05725b1Sbonwick 1692e14bb325SJeff Bonwick if (zio != pio) 1693e14bb325SJeff Bonwick zio_nowait(zio); 1694fa9e4066Sahrens } 1695fa9e4066Sahrens 1696e05725b1Sbonwick static int 1697e14bb325SJeff Bonwick zio_gang_assemble(zio_t *zio) 1698fa9e4066Sahrens { 1699e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1700fa9e4066Sahrens 1701f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); 1702f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1703f5383399SBill Moore 1704f5383399SBill Moore zio->io_gang_leader = zio; 1705fa9e4066Sahrens 1706e14bb325SJeff Bonwick zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); 1707e05725b1Sbonwick 1708e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1709fa9e4066Sahrens } 1710fa9e4066Sahrens 1711e05725b1Sbonwick static int 1712e14bb325SJeff Bonwick zio_gang_issue(zio_t *zio) 1713fa9e4066Sahrens { 1714e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1715fa9e4066Sahrens 1716e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) 1717e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1718fa9e4066Sahrens 1719f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); 1720f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1721fa9e4066Sahrens 1722e14bb325SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_GANG] == 0) 1723f5383399SBill Moore zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_data); 1724e14bb325SJeff Bonwick else 1725f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 1726fa9e4066Sahrens 1727e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1728e05725b1Sbonwick 1729e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1730fa9e4066Sahrens } 1731fa9e4066Sahrens 1732fa9e4066Sahrens static void 1733e14bb325SJeff Bonwick zio_write_gang_member_ready(zio_t *zio) 1734fa9e4066Sahrens { 1735a3f829aeSBill Moore zio_t *pio = zio_unique_parent(zio); 1736f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 173744cd46caSbillm dva_t *cdva = zio->io_bp->blk_dva; 173844cd46caSbillm dva_t *pdva = pio->io_bp->blk_dva; 1739fa9e4066Sahrens uint64_t asize; 1740fa9e4066Sahrens 1741e14bb325SJeff Bonwick if (BP_IS_HOLE(zio->io_bp)) 1742e14bb325SJeff Bonwick return; 1743e14bb325SJeff Bonwick 1744e14bb325SJeff Bonwick ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); 1745e14bb325SJeff Bonwick 1746e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_GANG); 1747b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); 1748b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); 1749b24ab676SJeff Bonwick ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); 175044cd46caSbillm ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); 1751fa9e4066Sahrens 1752fa9e4066Sahrens mutex_enter(&pio->io_lock); 1753e14bb325SJeff Bonwick for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { 175444cd46caSbillm ASSERT(DVA_GET_GANG(&pdva[d])); 175544cd46caSbillm asize = DVA_GET_ASIZE(&pdva[d]); 175644cd46caSbillm asize += DVA_GET_ASIZE(&cdva[d]); 175744cd46caSbillm DVA_SET_ASIZE(&pdva[d], asize); 175844cd46caSbillm } 1759fa9e4066Sahrens mutex_exit(&pio->io_lock); 1760fa9e4066Sahrens } 1761fa9e4066Sahrens 17620a4e9518Sgw static int 1763e14bb325SJeff Bonwick zio_write_gang_block(zio_t *pio) 1764fa9e4066Sahrens { 1765e14bb325SJeff Bonwick spa_t *spa = pio->io_spa; 1766e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 1767f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1768e14bb325SJeff Bonwick zio_t *zio; 1769e14bb325SJeff Bonwick zio_gang_node_t *gn, **gnpp; 1770fa9e4066Sahrens zio_gbh_phys_t *gbh; 1771e14bb325SJeff Bonwick uint64_t txg = pio->io_txg; 1772e14bb325SJeff Bonwick uint64_t resid = pio->io_size; 1773e14bb325SJeff Bonwick uint64_t lsize; 1774b24ab676SJeff Bonwick int copies = gio->io_prop.zp_copies; 1775b24ab676SJeff Bonwick int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); 1776e14bb325SJeff Bonwick zio_prop_t zp; 1777fa9e4066Sahrens int error; 1778fa9e4066Sahrens 1779b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), SPA_GANGBLOCKSIZE, 1780b24ab676SJeff Bonwick bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, 1781e14bb325SJeff Bonwick METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); 1782e05725b1Sbonwick if (error) { 1783e14bb325SJeff Bonwick pio->io_error = error; 1784e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1785e05725b1Sbonwick } 1786fa9e4066Sahrens 1787f5383399SBill Moore if (pio == gio) { 1788f5383399SBill Moore gnpp = &gio->io_gang_tree; 1789e14bb325SJeff Bonwick } else { 1790e14bb325SJeff Bonwick gnpp = pio->io_private; 1791e14bb325SJeff Bonwick ASSERT(pio->io_ready == zio_write_gang_member_ready); 1792fa9e4066Sahrens } 1793fa9e4066Sahrens 1794e14bb325SJeff Bonwick gn = zio_gang_node_alloc(gnpp); 1795e14bb325SJeff Bonwick gbh = gn->gn_gbh; 1796e14bb325SJeff Bonwick bzero(gbh, SPA_GANGBLOCKSIZE); 1797fa9e4066Sahrens 1798e14bb325SJeff Bonwick /* 1799e14bb325SJeff Bonwick * Create the gang header. 1800e14bb325SJeff Bonwick */ 1801e14bb325SJeff Bonwick zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, 1802e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1803fa9e4066Sahrens 1804e14bb325SJeff Bonwick /* 1805e14bb325SJeff Bonwick * Create and nowait the gang children. 1806e14bb325SJeff Bonwick */ 1807e14bb325SJeff Bonwick for (int g = 0; resid != 0; resid -= lsize, g++) { 1808e14bb325SJeff Bonwick lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), 1809e14bb325SJeff Bonwick SPA_MINBLOCKSIZE); 1810e14bb325SJeff Bonwick ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); 1811e14bb325SJeff Bonwick 1812f5383399SBill Moore zp.zp_checksum = gio->io_prop.zp_checksum; 1813e14bb325SJeff Bonwick zp.zp_compress = ZIO_COMPRESS_OFF; 1814e14bb325SJeff Bonwick zp.zp_type = DMU_OT_NONE; 1815e14bb325SJeff Bonwick zp.zp_level = 0; 1816b24ab676SJeff Bonwick zp.zp_copies = gio->io_prop.zp_copies; 181780901aeaSGeorge Wilson zp.zp_dedup = B_FALSE; 181880901aeaSGeorge Wilson zp.zp_dedup_verify = B_FALSE; 181980901aeaSGeorge Wilson zp.zp_nopwrite = B_FALSE; 1820e14bb325SJeff Bonwick 1821e14bb325SJeff Bonwick zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], 1822e14bb325SJeff Bonwick (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, 182369962b56SMatthew Ahrens zio_write_gang_member_ready, NULL, NULL, &gn->gn_child[g], 1824e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1825e14bb325SJeff Bonwick &pio->io_bookmark)); 1826e14bb325SJeff Bonwick } 1827e05725b1Sbonwick 182844cd46caSbillm /* 1829e14bb325SJeff Bonwick * Set pio's pipeline to just wait for zio to finish. 183044cd46caSbillm */ 1831e14bb325SJeff Bonwick pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1832e14bb325SJeff Bonwick 1833e14bb325SJeff Bonwick zio_nowait(zio); 1834e14bb325SJeff Bonwick 1835e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1836fa9e4066Sahrens } 1837fa9e4066Sahrens 183880901aeaSGeorge Wilson /* 183980901aeaSGeorge Wilson * The zio_nop_write stage in the pipeline determines if allocating 184080901aeaSGeorge Wilson * a new bp is necessary. By leveraging a cryptographically secure checksum, 184180901aeaSGeorge Wilson * such as SHA256, we can compare the checksums of the new data and the old 184280901aeaSGeorge Wilson * to determine if allocating a new block is required. The nopwrite 184380901aeaSGeorge Wilson * feature can handle writes in either syncing or open context (i.e. zil 184480901aeaSGeorge Wilson * writes) and as a result is mutually exclusive with dedup. 184580901aeaSGeorge Wilson */ 184680901aeaSGeorge Wilson static int 184780901aeaSGeorge Wilson zio_nop_write(zio_t *zio) 184880901aeaSGeorge Wilson { 184980901aeaSGeorge Wilson blkptr_t *bp = zio->io_bp; 185080901aeaSGeorge Wilson blkptr_t *bp_orig = &zio->io_bp_orig; 185180901aeaSGeorge Wilson zio_prop_t *zp = &zio->io_prop; 185280901aeaSGeorge Wilson 185380901aeaSGeorge Wilson ASSERT(BP_GET_LEVEL(bp) == 0); 185480901aeaSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 185580901aeaSGeorge Wilson ASSERT(zp->zp_nopwrite); 185680901aeaSGeorge Wilson ASSERT(!zp->zp_dedup); 185780901aeaSGeorge Wilson ASSERT(zio->io_bp_override == NULL); 185880901aeaSGeorge Wilson ASSERT(IO_IS_ALLOCATING(zio)); 185980901aeaSGeorge Wilson 186080901aeaSGeorge Wilson /* 186180901aeaSGeorge Wilson * Check to see if the original bp and the new bp have matching 186280901aeaSGeorge Wilson * characteristics (i.e. same checksum, compression algorithms, etc). 186380901aeaSGeorge Wilson * If they don't then just continue with the pipeline which will 186480901aeaSGeorge Wilson * allocate a new bp. 186580901aeaSGeorge Wilson */ 186680901aeaSGeorge Wilson if (BP_IS_HOLE(bp_orig) || 186780901aeaSGeorge Wilson !zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_dedup || 186880901aeaSGeorge Wilson BP_GET_CHECKSUM(bp) != BP_GET_CHECKSUM(bp_orig) || 186980901aeaSGeorge Wilson BP_GET_COMPRESS(bp) != BP_GET_COMPRESS(bp_orig) || 187080901aeaSGeorge Wilson BP_GET_DEDUP(bp) != BP_GET_DEDUP(bp_orig) || 187180901aeaSGeorge Wilson zp->zp_copies != BP_GET_NDVAS(bp_orig)) 187280901aeaSGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 187380901aeaSGeorge Wilson 187480901aeaSGeorge Wilson /* 187580901aeaSGeorge Wilson * If the checksums match then reset the pipeline so that we 187680901aeaSGeorge Wilson * avoid allocating a new bp and issuing any I/O. 187780901aeaSGeorge Wilson */ 187880901aeaSGeorge Wilson if (ZIO_CHECKSUM_EQUAL(bp->blk_cksum, bp_orig->blk_cksum)) { 187980901aeaSGeorge Wilson ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup); 188080901aeaSGeorge Wilson ASSERT3U(BP_GET_PSIZE(bp), ==, BP_GET_PSIZE(bp_orig)); 188180901aeaSGeorge Wilson ASSERT3U(BP_GET_LSIZE(bp), ==, BP_GET_LSIZE(bp_orig)); 188280901aeaSGeorge Wilson ASSERT(zp->zp_compress != ZIO_COMPRESS_OFF); 188380901aeaSGeorge Wilson ASSERT(bcmp(&bp->blk_prop, &bp_orig->blk_prop, 188480901aeaSGeorge Wilson sizeof (uint64_t)) == 0); 188580901aeaSGeorge Wilson 188680901aeaSGeorge Wilson *bp = *bp_orig; 188780901aeaSGeorge Wilson zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 188880901aeaSGeorge Wilson zio->io_flags |= ZIO_FLAG_NOPWRITE; 188980901aeaSGeorge Wilson } 189080901aeaSGeorge Wilson 189180901aeaSGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 189280901aeaSGeorge Wilson } 189380901aeaSGeorge Wilson 1894fa9e4066Sahrens /* 1895fa9e4066Sahrens * ========================================================================== 1896b24ab676SJeff Bonwick * Dedup 1897fa9e4066Sahrens * ========================================================================== 1898fa9e4066Sahrens */ 1899b24ab676SJeff Bonwick static void 1900b24ab676SJeff Bonwick zio_ddt_child_read_done(zio_t *zio) 1901b24ab676SJeff Bonwick { 1902b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1903b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1904b24ab676SJeff Bonwick ddt_phys_t *ddp; 1905b24ab676SJeff Bonwick zio_t *pio = zio_unique_parent(zio); 1906b24ab676SJeff Bonwick 1907b24ab676SJeff Bonwick mutex_enter(&pio->io_lock); 1908b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 1909b24ab676SJeff Bonwick if (zio->io_error == 0) 1910b24ab676SJeff Bonwick ddt_phys_clear(ddp); /* this ddp doesn't need repair */ 1911b24ab676SJeff Bonwick if (zio->io_error == 0 && dde->dde_repair_data == NULL) 1912b24ab676SJeff Bonwick dde->dde_repair_data = zio->io_data; 1913b24ab676SJeff Bonwick else 1914b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zio->io_size); 1915b24ab676SJeff Bonwick mutex_exit(&pio->io_lock); 1916b24ab676SJeff Bonwick } 1917b24ab676SJeff Bonwick 1918b24ab676SJeff Bonwick static int 1919b24ab676SJeff Bonwick zio_ddt_read_start(zio_t *zio) 1920b24ab676SJeff Bonwick { 1921b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1922b24ab676SJeff Bonwick 1923b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1924b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1925b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1926b24ab676SJeff Bonwick 1927b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1928b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1929b24ab676SJeff Bonwick ddt_entry_t *dde = ddt_repair_start(ddt, bp); 1930b24ab676SJeff Bonwick ddt_phys_t *ddp = dde->dde_phys; 1931b24ab676SJeff Bonwick ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); 1932b24ab676SJeff Bonwick blkptr_t blk; 1933b24ab676SJeff Bonwick 1934b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1935b24ab676SJeff Bonwick zio->io_vsd = dde; 1936b24ab676SJeff Bonwick 1937b24ab676SJeff Bonwick if (ddp_self == NULL) 1938b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1939b24ab676SJeff Bonwick 1940b24ab676SJeff Bonwick for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { 1941b24ab676SJeff Bonwick if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) 1942b24ab676SJeff Bonwick continue; 1943bbfd46c4SJeff Bonwick ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, 1944bbfd46c4SJeff Bonwick &blk); 1945b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, &blk, 1946b24ab676SJeff Bonwick zio_buf_alloc(zio->io_size), zio->io_size, 1947b24ab676SJeff Bonwick zio_ddt_child_read_done, dde, zio->io_priority, 1948b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio) | ZIO_FLAG_DONT_PROPAGATE, 1949b24ab676SJeff Bonwick &zio->io_bookmark)); 1950b24ab676SJeff Bonwick } 1951b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1952b24ab676SJeff Bonwick } 1953b24ab676SJeff Bonwick 1954b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, bp, 1955b24ab676SJeff Bonwick zio->io_data, zio->io_size, NULL, NULL, zio->io_priority, 1956b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); 1957b24ab676SJeff Bonwick 1958b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1959b24ab676SJeff Bonwick } 1960e14bb325SJeff Bonwick 1961b24ab676SJeff Bonwick static int 1962b24ab676SJeff Bonwick zio_ddt_read_done(zio_t *zio) 1963b24ab676SJeff Bonwick { 1964b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1965b24ab676SJeff Bonwick 1966b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE)) 1967b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 1968b24ab676SJeff Bonwick 1969b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1970b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1971b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1972b24ab676SJeff Bonwick 1973b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1974b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1975b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_vsd; 1976b24ab676SJeff Bonwick if (ddt == NULL) { 1977b16da2e2SGeorge Wilson ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE); 1978b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1979b24ab676SJeff Bonwick } 1980b24ab676SJeff Bonwick if (dde == NULL) { 1981b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; 198235a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 1983b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 1984b24ab676SJeff Bonwick } 1985b24ab676SJeff Bonwick if (dde->dde_repair_data != NULL) { 1986b24ab676SJeff Bonwick bcopy(dde->dde_repair_data, zio->io_data, zio->io_size); 1987b24ab676SJeff Bonwick zio->io_child_error[ZIO_CHILD_DDT] = 0; 1988b24ab676SJeff Bonwick } 1989b24ab676SJeff Bonwick ddt_repair_done(ddt, dde); 1990b24ab676SJeff Bonwick zio->io_vsd = NULL; 1991b24ab676SJeff Bonwick } 1992b24ab676SJeff Bonwick 1993b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1994b24ab676SJeff Bonwick 1995b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1996b24ab676SJeff Bonwick } 1997b24ab676SJeff Bonwick 1998b24ab676SJeff Bonwick static boolean_t 1999b24ab676SJeff Bonwick zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) 2000b24ab676SJeff Bonwick { 2001b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2002b24ab676SJeff Bonwick 2003b24ab676SJeff Bonwick /* 2004b24ab676SJeff Bonwick * Note: we compare the original data, not the transformed data, 2005b24ab676SJeff Bonwick * because when zio->io_bp is an override bp, we will not have 2006b24ab676SJeff Bonwick * pushed the I/O transforms. That's an important optimization 2007b24ab676SJeff Bonwick * because otherwise we'd compress/encrypt all dmu_sync() data twice. 2008b24ab676SJeff Bonwick */ 2009b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 2010b24ab676SJeff Bonwick zio_t *lio = dde->dde_lead_zio[p]; 2011b24ab676SJeff Bonwick 2012b24ab676SJeff Bonwick if (lio != NULL) { 2013b24ab676SJeff Bonwick return (lio->io_orig_size != zio->io_orig_size || 2014b24ab676SJeff Bonwick bcmp(zio->io_orig_data, lio->io_orig_data, 2015b24ab676SJeff Bonwick zio->io_orig_size) != 0); 2016b24ab676SJeff Bonwick } 2017b24ab676SJeff Bonwick } 2018b24ab676SJeff Bonwick 2019b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 2020b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2021b24ab676SJeff Bonwick 2022b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) { 2023b24ab676SJeff Bonwick arc_buf_t *abuf = NULL; 2024b24ab676SJeff Bonwick uint32_t aflags = ARC_WAIT; 2025b24ab676SJeff Bonwick blkptr_t blk = *zio->io_bp; 2026b24ab676SJeff Bonwick int error; 2027b24ab676SJeff Bonwick 2028b24ab676SJeff Bonwick ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); 2029b24ab676SJeff Bonwick 2030b24ab676SJeff Bonwick ddt_exit(ddt); 2031b24ab676SJeff Bonwick 20321b912ec7SGeorge Wilson error = arc_read(NULL, spa, &blk, 2033b24ab676SJeff Bonwick arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, 2034b24ab676SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2035b24ab676SJeff Bonwick &aflags, &zio->io_bookmark); 2036b24ab676SJeff Bonwick 2037b24ab676SJeff Bonwick if (error == 0) { 2038b24ab676SJeff Bonwick if (arc_buf_size(abuf) != zio->io_orig_size || 2039b24ab676SJeff Bonwick bcmp(abuf->b_data, zio->io_orig_data, 2040b24ab676SJeff Bonwick zio->io_orig_size) != 0) 2041be6fd75aSMatthew Ahrens error = SET_ERROR(EEXIST); 20423b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(abuf, &abuf)); 2043b24ab676SJeff Bonwick } 2044b24ab676SJeff Bonwick 2045b24ab676SJeff Bonwick ddt_enter(ddt); 2046b24ab676SJeff Bonwick return (error != 0); 2047b24ab676SJeff Bonwick } 2048b24ab676SJeff Bonwick } 2049b24ab676SJeff Bonwick 2050b24ab676SJeff Bonwick return (B_FALSE); 2051b24ab676SJeff Bonwick } 2052b24ab676SJeff Bonwick 2053b24ab676SJeff Bonwick static void 2054b24ab676SJeff Bonwick zio_ddt_child_write_ready(zio_t *zio) 2055b24ab676SJeff Bonwick { 2056b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 2057b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 2058b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2059b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2060b24ab676SJeff Bonwick zio_t *pio; 2061b24ab676SJeff Bonwick 2062b24ab676SJeff Bonwick if (zio->io_error) 2063b24ab676SJeff Bonwick return; 2064b24ab676SJeff Bonwick 2065b24ab676SJeff Bonwick ddt_enter(ddt); 2066b24ab676SJeff Bonwick 2067b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2068b24ab676SJeff Bonwick 2069b24ab676SJeff Bonwick ddt_phys_fill(ddp, zio->io_bp); 2070b24ab676SJeff Bonwick 2071b24ab676SJeff Bonwick while ((pio = zio_walk_parents(zio)) != NULL) 2072b24ab676SJeff Bonwick ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); 2073b24ab676SJeff Bonwick 2074b24ab676SJeff Bonwick ddt_exit(ddt); 2075b24ab676SJeff Bonwick } 2076b24ab676SJeff Bonwick 2077b24ab676SJeff Bonwick static void 2078b24ab676SJeff Bonwick zio_ddt_child_write_done(zio_t *zio) 2079b24ab676SJeff Bonwick { 2080b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 2081b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 2082b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2083b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2084b24ab676SJeff Bonwick 2085b24ab676SJeff Bonwick ddt_enter(ddt); 2086b24ab676SJeff Bonwick 2087b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 2088b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2089b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 2090b24ab676SJeff Bonwick 2091b24ab676SJeff Bonwick if (zio->io_error == 0) { 2092b24ab676SJeff Bonwick while (zio_walk_parents(zio) != NULL) 2093b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2094b24ab676SJeff Bonwick } else { 2095b24ab676SJeff Bonwick ddt_phys_clear(ddp); 2096b24ab676SJeff Bonwick } 2097b24ab676SJeff Bonwick 2098b24ab676SJeff Bonwick ddt_exit(ddt); 2099b24ab676SJeff Bonwick } 2100b24ab676SJeff Bonwick 2101b24ab676SJeff Bonwick static void 2102b24ab676SJeff Bonwick zio_ddt_ditto_write_done(zio_t *zio) 2103b24ab676SJeff Bonwick { 2104b24ab676SJeff Bonwick int p = DDT_PHYS_DITTO; 2105b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 2106b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2107b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 2108b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2109b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2110b24ab676SJeff Bonwick ddt_key_t *ddk = &dde->dde_key; 2111b24ab676SJeff Bonwick 2112b24ab676SJeff Bonwick ddt_enter(ddt); 2113b24ab676SJeff Bonwick 2114b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 2115b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2116b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 2117b24ab676SJeff Bonwick 2118b24ab676SJeff Bonwick if (zio->io_error == 0) { 2119b24ab676SJeff Bonwick ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); 2120b24ab676SJeff Bonwick ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); 2121b24ab676SJeff Bonwick ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); 2122b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2123b24ab676SJeff Bonwick ddt_phys_free(ddt, ddk, ddp, zio->io_txg); 2124b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2125b24ab676SJeff Bonwick } 2126b24ab676SJeff Bonwick 2127b24ab676SJeff Bonwick ddt_exit(ddt); 2128b24ab676SJeff Bonwick } 2129b24ab676SJeff Bonwick 2130b24ab676SJeff Bonwick static int 2131b24ab676SJeff Bonwick zio_ddt_write(zio_t *zio) 2132b24ab676SJeff Bonwick { 2133b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2134b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2135b24ab676SJeff Bonwick uint64_t txg = zio->io_txg; 2136b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 2137b24ab676SJeff Bonwick int p = zp->zp_copies; 2138b24ab676SJeff Bonwick int ditto_copies; 2139b24ab676SJeff Bonwick zio_t *cio = NULL; 2140b24ab676SJeff Bonwick zio_t *dio = NULL; 2141b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2142b24ab676SJeff Bonwick ddt_entry_t *dde; 2143b24ab676SJeff Bonwick ddt_phys_t *ddp; 2144b24ab676SJeff Bonwick 2145b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2146b24ab676SJeff Bonwick ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); 2147b24ab676SJeff Bonwick ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); 2148b24ab676SJeff Bonwick 2149b24ab676SJeff Bonwick ddt_enter(ddt); 2150b24ab676SJeff Bonwick dde = ddt_lookup(ddt, bp, B_TRUE); 2151b24ab676SJeff Bonwick ddp = &dde->dde_phys[p]; 2152b24ab676SJeff Bonwick 2153b24ab676SJeff Bonwick if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { 2154b24ab676SJeff Bonwick /* 2155b24ab676SJeff Bonwick * If we're using a weak checksum, upgrade to a strong checksum 2156b24ab676SJeff Bonwick * and try again. If we're already using a strong checksum, 2157b24ab676SJeff Bonwick * we can't resolve it, so just convert to an ordinary write. 2158b24ab676SJeff Bonwick * (And automatically e-mail a paper to Nature?) 2159b24ab676SJeff Bonwick */ 2160b24ab676SJeff Bonwick if (!zio_checksum_table[zp->zp_checksum].ci_dedup) { 2161b24ab676SJeff Bonwick zp->zp_checksum = spa_dedup_checksum(spa); 2162b24ab676SJeff Bonwick zio_pop_transforms(zio); 2163b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2164b24ab676SJeff Bonwick BP_ZERO(bp); 2165b24ab676SJeff Bonwick } else { 216680901aeaSGeorge Wilson zp->zp_dedup = B_FALSE; 2167b24ab676SJeff Bonwick } 2168b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2169b24ab676SJeff Bonwick ddt_exit(ddt); 2170b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2171b24ab676SJeff Bonwick } 2172b24ab676SJeff Bonwick 2173b24ab676SJeff Bonwick ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); 2174b24ab676SJeff Bonwick ASSERT(ditto_copies < SPA_DVAS_PER_BP); 2175b24ab676SJeff Bonwick 2176b24ab676SJeff Bonwick if (ditto_copies > ddt_ditto_copies_present(dde) && 2177b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { 2178b24ab676SJeff Bonwick zio_prop_t czp = *zp; 2179b24ab676SJeff Bonwick 2180b24ab676SJeff Bonwick czp.zp_copies = ditto_copies; 2181b24ab676SJeff Bonwick 2182b24ab676SJeff Bonwick /* 2183b24ab676SJeff Bonwick * If we arrived here with an override bp, we won't have run 2184b24ab676SJeff Bonwick * the transform stack, so we won't have the data we need to 2185b24ab676SJeff Bonwick * generate a child i/o. So, toss the override bp and restart. 2186b24ab676SJeff Bonwick * This is safe, because using the override bp is just an 2187b24ab676SJeff Bonwick * optimization; and it's rare, so the cost doesn't matter. 2188b24ab676SJeff Bonwick */ 2189b24ab676SJeff Bonwick if (zio->io_bp_override) { 2190b24ab676SJeff Bonwick zio_pop_transforms(zio); 2191b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2192b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2193b24ab676SJeff Bonwick zio->io_bp_override = NULL; 2194b24ab676SJeff Bonwick BP_ZERO(bp); 2195b24ab676SJeff Bonwick ddt_exit(ddt); 2196b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2197b24ab676SJeff Bonwick } 2198b24ab676SJeff Bonwick 2199b24ab676SJeff Bonwick dio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 220069962b56SMatthew Ahrens zio->io_orig_size, &czp, NULL, NULL, 2201b24ab676SJeff Bonwick zio_ddt_ditto_write_done, dde, zio->io_priority, 2202b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2203b24ab676SJeff Bonwick 2204b24ab676SJeff Bonwick zio_push_transform(dio, zio->io_data, zio->io_size, 0, NULL); 2205b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; 2206b24ab676SJeff Bonwick } 2207b24ab676SJeff Bonwick 2208b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { 2209b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2210b24ab676SJeff Bonwick ddt_bp_fill(ddp, bp, txg); 2211b24ab676SJeff Bonwick if (dde->dde_lead_zio[p] != NULL) 2212b24ab676SJeff Bonwick zio_add_child(zio, dde->dde_lead_zio[p]); 2213b24ab676SJeff Bonwick else 2214b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2215b24ab676SJeff Bonwick } else if (zio->io_bp_override) { 2216b24ab676SJeff Bonwick ASSERT(bp->blk_birth == txg); 2217b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, zio->io_bp_override)); 2218b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2219b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2220b24ab676SJeff Bonwick } else { 2221b24ab676SJeff Bonwick cio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 222269962b56SMatthew Ahrens zio->io_orig_size, zp, zio_ddt_child_write_ready, NULL, 2223b24ab676SJeff Bonwick zio_ddt_child_write_done, dde, zio->io_priority, 2224b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2225b24ab676SJeff Bonwick 2226b24ab676SJeff Bonwick zio_push_transform(cio, zio->io_data, zio->io_size, 0, NULL); 2227b24ab676SJeff Bonwick dde->dde_lead_zio[p] = cio; 2228b24ab676SJeff Bonwick } 2229b24ab676SJeff Bonwick 2230b24ab676SJeff Bonwick ddt_exit(ddt); 2231b24ab676SJeff Bonwick 2232b24ab676SJeff Bonwick if (cio) 2233b24ab676SJeff Bonwick zio_nowait(cio); 2234b24ab676SJeff Bonwick if (dio) 2235b24ab676SJeff Bonwick zio_nowait(dio); 2236b24ab676SJeff Bonwick 2237b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2238b24ab676SJeff Bonwick } 2239b24ab676SJeff Bonwick 22403f9d6ad7SLin Ling ddt_entry_t *freedde; /* for debugging */ 22413f9d6ad7SLin Ling 2242b24ab676SJeff Bonwick static int 2243b24ab676SJeff Bonwick zio_ddt_free(zio_t *zio) 2244b24ab676SJeff Bonwick { 2245b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2246b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2247b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2248b24ab676SJeff Bonwick ddt_entry_t *dde; 2249b24ab676SJeff Bonwick ddt_phys_t *ddp; 2250b24ab676SJeff Bonwick 2251b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2252b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2253b24ab676SJeff Bonwick 2254b24ab676SJeff Bonwick ddt_enter(ddt); 22553f9d6ad7SLin Ling freedde = dde = ddt_lookup(ddt, bp, B_TRUE); 2256b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 2257b24ab676SJeff Bonwick ddt_phys_decref(ddp); 2258b24ab676SJeff Bonwick ddt_exit(ddt); 2259b24ab676SJeff Bonwick 2260b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2261b24ab676SJeff Bonwick } 2262b24ab676SJeff Bonwick 2263b24ab676SJeff Bonwick /* 2264b24ab676SJeff Bonwick * ========================================================================== 2265b24ab676SJeff Bonwick * Allocate and free blocks 2266b24ab676SJeff Bonwick * ========================================================================== 2267b24ab676SJeff Bonwick */ 2268e05725b1Sbonwick static int 2269fa9e4066Sahrens zio_dva_allocate(zio_t *zio) 2270fa9e4066Sahrens { 22718654d025Sperrin spa_t *spa = zio->io_spa; 2272b24ab676SJeff Bonwick metaslab_class_t *mc = spa_normal_class(spa); 2273fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2274fa9e4066Sahrens int error; 227509c9d376SGeorge Wilson int flags = 0; 2276fa9e4066Sahrens 2277f5383399SBill Moore if (zio->io_gang_leader == NULL) { 2278f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 2279f5383399SBill Moore zio->io_gang_leader = zio; 2280f5383399SBill Moore } 2281f5383399SBill Moore 2282fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 2283fb09f5aaSMadhav Suresh ASSERT0(BP_GET_NDVAS(bp)); 2284b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, >, 0); 2285b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); 2286fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 2287fa9e4066Sahrens 228809c9d376SGeorge Wilson /* 228909c9d376SGeorge Wilson * The dump device does not support gang blocks so allocation on 229009c9d376SGeorge Wilson * behalf of the dump device (i.e. ZIO_FLAG_NODATA) must avoid 229109c9d376SGeorge Wilson * the "fast" gang feature. 229209c9d376SGeorge Wilson */ 229309c9d376SGeorge Wilson flags |= (zio->io_flags & ZIO_FLAG_NODATA) ? METASLAB_GANG_AVOID : 0; 229409c9d376SGeorge Wilson flags |= (zio->io_flags & ZIO_FLAG_GANG_CHILD) ? 229509c9d376SGeorge Wilson METASLAB_GANG_CHILD : 0; 2296e14bb325SJeff Bonwick error = metaslab_alloc(spa, mc, zio->io_size, bp, 229709c9d376SGeorge Wilson zio->io_prop.zp_copies, zio->io_txg, NULL, flags); 2298fa9e4066Sahrens 2299e14bb325SJeff Bonwick if (error) { 230009c9d376SGeorge Wilson spa_dbgmsg(spa, "%s: metaslab allocation failure: zio %p, " 230109c9d376SGeorge Wilson "size %llu, error %d", spa_name(spa), zio, zio->io_size, 230209c9d376SGeorge Wilson error); 2303e14bb325SJeff Bonwick if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) 2304e14bb325SJeff Bonwick return (zio_write_gang_block(zio)); 2305fa9e4066Sahrens zio->io_error = error; 2306fa9e4066Sahrens } 2307e05725b1Sbonwick 2308e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2309fa9e4066Sahrens } 2310fa9e4066Sahrens 2311e05725b1Sbonwick static int 2312fa9e4066Sahrens zio_dva_free(zio_t *zio) 2313fa9e4066Sahrens { 2314e14bb325SJeff Bonwick metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); 2315fa9e4066Sahrens 2316e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2317fa9e4066Sahrens } 2318fa9e4066Sahrens 2319e05725b1Sbonwick static int 2320fa9e4066Sahrens zio_dva_claim(zio_t *zio) 2321fa9e4066Sahrens { 2322e14bb325SJeff Bonwick int error; 2323e14bb325SJeff Bonwick 2324e14bb325SJeff Bonwick error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); 2325e14bb325SJeff Bonwick if (error) 2326e14bb325SJeff Bonwick zio->io_error = error; 2327fa9e4066Sahrens 2328e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2329fa9e4066Sahrens } 2330fa9e4066Sahrens 2331e14bb325SJeff Bonwick /* 2332e14bb325SJeff Bonwick * Undo an allocation. This is used by zio_done() when an I/O fails 2333e14bb325SJeff Bonwick * and we want to give back the block we just allocated. 2334e14bb325SJeff Bonwick * This handles both normal blocks and gang blocks. 2335e14bb325SJeff Bonwick */ 2336e14bb325SJeff Bonwick static void 2337e14bb325SJeff Bonwick zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) 2338e14bb325SJeff Bonwick { 2339e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2340b24ab676SJeff Bonwick ASSERT(zio->io_bp_override == NULL); 2341e14bb325SJeff Bonwick 2342e14bb325SJeff Bonwick if (!BP_IS_HOLE(bp)) 2343b24ab676SJeff Bonwick metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); 2344e14bb325SJeff Bonwick 2345e14bb325SJeff Bonwick if (gn != NULL) { 2346e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 2347e14bb325SJeff Bonwick zio_dva_unallocate(zio, gn->gn_child[g], 2348e14bb325SJeff Bonwick &gn->gn_gbh->zg_blkptr[g]); 2349e14bb325SJeff Bonwick } 2350e14bb325SJeff Bonwick } 2351e14bb325SJeff Bonwick } 2352e14bb325SJeff Bonwick 2353e14bb325SJeff Bonwick /* 2354e14bb325SJeff Bonwick * Try to allocate an intent log block. Return 0 on success, errno on failure. 2355e14bb325SJeff Bonwick */ 2356e14bb325SJeff Bonwick int 2357b24ab676SJeff Bonwick zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, blkptr_t *old_bp, 2358b24ab676SJeff Bonwick uint64_t size, boolean_t use_slog) 2359e14bb325SJeff Bonwick { 2360e09fa4daSNeil Perrin int error = 1; 2361e14bb325SJeff Bonwick 2362b24ab676SJeff Bonwick ASSERT(txg > spa_syncing_txg(spa)); 2363b24ab676SJeff Bonwick 2364840345f6SGeorge Wilson /* 2365840345f6SGeorge Wilson * ZIL blocks are always contiguous (i.e. not gang blocks) so we 2366840345f6SGeorge Wilson * set the METASLAB_GANG_AVOID flag so that they don't "fast gang" 2367840345f6SGeorge Wilson * when allocating them. 2368840345f6SGeorge Wilson */ 2369840345f6SGeorge Wilson if (use_slog) { 2370b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_log_class(spa), size, 2371840345f6SGeorge Wilson new_bp, 1, txg, old_bp, 2372840345f6SGeorge Wilson METASLAB_HINTBP_AVOID | METASLAB_GANG_AVOID); 2373840345f6SGeorge Wilson } 2374e14bb325SJeff Bonwick 2375840345f6SGeorge Wilson if (error) { 2376b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), size, 2377840345f6SGeorge Wilson new_bp, 1, txg, old_bp, 237822e30981SGeorge Wilson METASLAB_HINTBP_AVOID); 2379840345f6SGeorge Wilson } 2380e14bb325SJeff Bonwick 2381e14bb325SJeff Bonwick if (error == 0) { 2382e14bb325SJeff Bonwick BP_SET_LSIZE(new_bp, size); 2383e14bb325SJeff Bonwick BP_SET_PSIZE(new_bp, size); 2384e14bb325SJeff Bonwick BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); 23856e1f5caaSNeil Perrin BP_SET_CHECKSUM(new_bp, 23866e1f5caaSNeil Perrin spa_version(spa) >= SPA_VERSION_SLIM_ZIL 23876e1f5caaSNeil Perrin ? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG); 2388e14bb325SJeff Bonwick BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 2389e14bb325SJeff Bonwick BP_SET_LEVEL(new_bp, 0); 2390b24ab676SJeff Bonwick BP_SET_DEDUP(new_bp, 0); 2391e14bb325SJeff Bonwick BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); 2392e14bb325SJeff Bonwick } 2393e14bb325SJeff Bonwick 2394e14bb325SJeff Bonwick return (error); 2395e14bb325SJeff Bonwick } 2396e14bb325SJeff Bonwick 2397e14bb325SJeff Bonwick /* 2398b24ab676SJeff Bonwick * Free an intent log block. 2399e14bb325SJeff Bonwick */ 2400e14bb325SJeff Bonwick void 2401b24ab676SJeff Bonwick zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp) 2402e14bb325SJeff Bonwick { 2403b24ab676SJeff Bonwick ASSERT(BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG); 2404e14bb325SJeff Bonwick ASSERT(!BP_IS_GANG(bp)); 2405e14bb325SJeff Bonwick 2406b24ab676SJeff Bonwick zio_free(spa, txg, bp); 2407e14bb325SJeff Bonwick } 2408e14bb325SJeff Bonwick 2409fa9e4066Sahrens /* 2410fa9e4066Sahrens * ========================================================================== 2411fa9e4066Sahrens * Read and write to physical devices 2412fa9e4066Sahrens * ========================================================================== 2413fa9e4066Sahrens */ 2414e05725b1Sbonwick static int 241544cd46caSbillm zio_vdev_io_start(zio_t *zio) 2416fa9e4066Sahrens { 2417fa9e4066Sahrens vdev_t *vd = zio->io_vd; 241844cd46caSbillm uint64_t align; 24190a4e9518Sgw spa_t *spa = zio->io_spa; 24200a4e9518Sgw 2421e14bb325SJeff Bonwick ASSERT(zio->io_error == 0); 2422e14bb325SJeff Bonwick ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); 2423fa9e4066Sahrens 2424e14bb325SJeff Bonwick if (vd == NULL) { 2425e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2426e14bb325SJeff Bonwick spa_config_enter(spa, SCL_ZIO, zio, RW_READER); 2427fa9e4066Sahrens 2428e14bb325SJeff Bonwick /* 2429e14bb325SJeff Bonwick * The mirror_ops handle multiple DVAs in a single BP. 2430e14bb325SJeff Bonwick */ 2431e14bb325SJeff Bonwick return (vdev_mirror_ops.vdev_op_io_start(zio)); 2432fa9e4066Sahrens } 2433fa9e4066Sahrens 243444ecc532SGeorge Wilson /* 243544ecc532SGeorge Wilson * We keep track of time-sensitive I/Os so that the scan thread 243644ecc532SGeorge Wilson * can quickly react to certain workloads. In particular, we care 243744ecc532SGeorge Wilson * about non-scrubbing, top-level reads and writes with the following 243844ecc532SGeorge Wilson * characteristics: 243944ecc532SGeorge Wilson * - synchronous writes of user data to non-slog devices 244044ecc532SGeorge Wilson * - any reads of user data 244144ecc532SGeorge Wilson * When these conditions are met, adjust the timestamp of spa_last_io 244244ecc532SGeorge Wilson * which allows the scan thread to adjust its workload accordingly. 244344ecc532SGeorge Wilson */ 244444ecc532SGeorge Wilson if (!(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && zio->io_bp != NULL && 244544ecc532SGeorge Wilson vd == vd->vdev_top && !vd->vdev_islog && 244644ecc532SGeorge Wilson zio->io_bookmark.zb_objset != DMU_META_OBJSET && 244744ecc532SGeorge Wilson zio->io_txg != spa_syncing_txg(spa)) { 244844ecc532SGeorge Wilson uint64_t old = spa->spa_last_io; 244944ecc532SGeorge Wilson uint64_t new = ddi_get_lbolt64(); 245044ecc532SGeorge Wilson if (old != new) 245144ecc532SGeorge Wilson (void) atomic_cas_64(&spa->spa_last_io, old, new); 245244ecc532SGeorge Wilson } 245344ecc532SGeorge Wilson 2454e14bb325SJeff Bonwick align = 1ULL << vd->vdev_top->vdev_ashift; 2455e14bb325SJeff Bonwick 2456ecc2d604Sbonwick if (P2PHASE(zio->io_size, align) != 0) { 2457ecc2d604Sbonwick uint64_t asize = P2ROUNDUP(zio->io_size, align); 2458ecc2d604Sbonwick char *abuf = zio_buf_alloc(asize); 2459e14bb325SJeff Bonwick ASSERT(vd == vd->vdev_top); 2460ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_WRITE) { 2461ecc2d604Sbonwick bcopy(zio->io_data, abuf, zio->io_size); 2462ecc2d604Sbonwick bzero(abuf + zio->io_size, asize - zio->io_size); 2463ecc2d604Sbonwick } 2464e14bb325SJeff Bonwick zio_push_transform(zio, abuf, asize, asize, zio_subblock); 2465ecc2d604Sbonwick } 2466ecc2d604Sbonwick 2467ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_offset, align) == 0); 2468ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_size, align) == 0); 2469f9af39baSGeorge Wilson VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); 24708ad4d6ddSJeff Bonwick 24718ad4d6ddSJeff Bonwick /* 24728ad4d6ddSJeff Bonwick * If this is a repair I/O, and there's no self-healing involved -- 24738ad4d6ddSJeff Bonwick * that is, we're just resilvering what we expect to resilver -- 24748ad4d6ddSJeff Bonwick * then don't do the I/O unless zio's txg is actually in vd's DTL. 24758ad4d6ddSJeff Bonwick * This prevents spurious resilvering with nested replication. 24768ad4d6ddSJeff Bonwick * For example, given a mirror of mirrors, (A+B)+(C+D), if only 24778ad4d6ddSJeff Bonwick * A is out of date, we'll read from C+D, then use the data to 24788ad4d6ddSJeff Bonwick * resilver A+B -- but we don't actually want to resilver B, just A. 24798ad4d6ddSJeff Bonwick * The top-level mirror has no way to know this, so instead we just 24808ad4d6ddSJeff Bonwick * discard unnecessary repairs as we work our way down the vdev tree. 24818ad4d6ddSJeff Bonwick * The same logic applies to any form of nested replication: 24828ad4d6ddSJeff Bonwick * ditto + mirror, RAID-Z + replacing, etc. This covers them all. 24838ad4d6ddSJeff Bonwick */ 24848ad4d6ddSJeff Bonwick if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && 24858ad4d6ddSJeff Bonwick !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && 24868ad4d6ddSJeff Bonwick zio->io_txg != 0 && /* not a delegated i/o */ 24878ad4d6ddSJeff Bonwick !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { 24888ad4d6ddSJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 24898ad4d6ddSJeff Bonwick zio_vdev_io_bypass(zio); 24908ad4d6ddSJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 24918ad4d6ddSJeff Bonwick } 2492fa9e4066Sahrens 2493e14bb325SJeff Bonwick if (vd->vdev_ops->vdev_op_leaf && 2494e14bb325SJeff Bonwick (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { 2495e14bb325SJeff Bonwick 2496*43466aaeSMax Grossman if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio)) 2497a3f829aeSBill Moore return (ZIO_PIPELINE_CONTINUE); 2498e14bb325SJeff Bonwick 2499e14bb325SJeff Bonwick if ((zio = vdev_queue_io(zio)) == NULL) 2500e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2501e14bb325SJeff Bonwick 2502e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2503be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(ENXIO); 2504e14bb325SJeff Bonwick zio_interrupt(zio); 2505e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2506e14bb325SJeff Bonwick } 2507e14bb325SJeff Bonwick } 2508e14bb325SJeff Bonwick 2509e05725b1Sbonwick return (vd->vdev_ops->vdev_op_io_start(zio)); 2510fa9e4066Sahrens } 2511fa9e4066Sahrens 2512e05725b1Sbonwick static int 2513fa9e4066Sahrens zio_vdev_io_done(zio_t *zio) 2514fa9e4066Sahrens { 2515e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2516e14bb325SJeff Bonwick vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; 2517e14bb325SJeff Bonwick boolean_t unexpected_error = B_FALSE; 2518e05725b1Sbonwick 2519e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2520e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2521fa9e4066Sahrens 2522e14bb325SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); 2523e14bb325SJeff Bonwick 2524e14bb325SJeff Bonwick if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { 2525e14bb325SJeff Bonwick 2526e14bb325SJeff Bonwick vdev_queue_io_done(zio); 2527fa9e4066Sahrens 2528e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE) 2529e14bb325SJeff Bonwick vdev_cache_write(zio); 2530e14bb325SJeff Bonwick 2531e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 25328956713aSEric Schrock zio->io_error = zio_handle_device_injection(vd, 25338956713aSEric Schrock zio, EIO); 2534e14bb325SJeff Bonwick 2535e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2536e14bb325SJeff Bonwick zio->io_error = zio_handle_label_injection(zio, EIO); 2537e14bb325SJeff Bonwick 2538e14bb325SJeff Bonwick if (zio->io_error) { 2539e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2540be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(ENXIO); 2541e14bb325SJeff Bonwick } else { 2542e14bb325SJeff Bonwick unexpected_error = B_TRUE; 2543e14bb325SJeff Bonwick } 2544e14bb325SJeff Bonwick } 254551ece835Seschrock } 2546fa9e4066Sahrens 2547e14bb325SJeff Bonwick ops->vdev_op_io_done(zio); 2548e14bb325SJeff Bonwick 2549e14bb325SJeff Bonwick if (unexpected_error) 2550a3f829aeSBill Moore VERIFY(vdev_probe(vd, zio) == NULL); 2551e14bb325SJeff Bonwick 2552e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2553fa9e4066Sahrens } 2554fa9e4066Sahrens 255522fe2c88SJonathan Adams /* 255622fe2c88SJonathan Adams * For non-raidz ZIOs, we can just copy aside the bad data read from the 255722fe2c88SJonathan Adams * disk, and use that to finish the checksum ereport later. 255822fe2c88SJonathan Adams */ 255922fe2c88SJonathan Adams static void 256022fe2c88SJonathan Adams zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, 256122fe2c88SJonathan Adams const void *good_buf) 256222fe2c88SJonathan Adams { 256322fe2c88SJonathan Adams /* no processing needed */ 256422fe2c88SJonathan Adams zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); 256522fe2c88SJonathan Adams } 256622fe2c88SJonathan Adams 256722fe2c88SJonathan Adams /*ARGSUSED*/ 256822fe2c88SJonathan Adams void 256922fe2c88SJonathan Adams zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) 257022fe2c88SJonathan Adams { 257122fe2c88SJonathan Adams void *buf = zio_buf_alloc(zio->io_size); 257222fe2c88SJonathan Adams 257322fe2c88SJonathan Adams bcopy(zio->io_data, buf, zio->io_size); 257422fe2c88SJonathan Adams 257522fe2c88SJonathan Adams zcr->zcr_cbinfo = zio->io_size; 257622fe2c88SJonathan Adams zcr->zcr_cbdata = buf; 257722fe2c88SJonathan Adams zcr->zcr_finish = zio_vsd_default_cksum_finish; 257822fe2c88SJonathan Adams zcr->zcr_free = zio_buf_free; 257922fe2c88SJonathan Adams } 258022fe2c88SJonathan Adams 2581e05725b1Sbonwick static int 2582fa9e4066Sahrens zio_vdev_io_assess(zio_t *zio) 2583fa9e4066Sahrens { 2584fa9e4066Sahrens vdev_t *vd = zio->io_vd; 2585e14bb325SJeff Bonwick 2586e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2587e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2588e14bb325SJeff Bonwick 2589e14bb325SJeff Bonwick if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2590e14bb325SJeff Bonwick spa_config_exit(zio->io_spa, SCL_ZIO, zio); 2591e14bb325SJeff Bonwick 2592e14bb325SJeff Bonwick if (zio->io_vsd != NULL) { 259322fe2c88SJonathan Adams zio->io_vsd_ops->vsd_free(zio); 2594e14bb325SJeff Bonwick zio->io_vsd = NULL; 2595ecc2d604Sbonwick } 2596ecc2d604Sbonwick 2597e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2598ea8dc4b6Seschrock zio->io_error = zio_handle_fault_injection(zio, EIO); 2599ea8dc4b6Seschrock 2600fa9e4066Sahrens /* 2601fa9e4066Sahrens * If the I/O failed, determine whether we should attempt to retry it. 260235a5a358SJonathan Adams * 260335a5a358SJonathan Adams * On retry, we cut in line in the issue queue, since we don't want 260435a5a358SJonathan Adams * compression/checksumming/etc. work to prevent our (cheap) IO reissue. 2605fa9e4066Sahrens */ 2606e14bb325SJeff Bonwick if (zio->io_error && vd == NULL && 2607e14bb325SJeff Bonwick !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { 2608e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ 2609e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ 2610fa9e4066Sahrens zio->io_error = 0; 2611e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_RETRY | 2612e14bb325SJeff Bonwick ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; 2613b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; 261435a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, 261535a5a358SJonathan Adams zio_requeue_io_start_cut_in_line); 2616e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2617ea8dc4b6Seschrock } 2618fa9e4066Sahrens 2619e14bb325SJeff Bonwick /* 2620e14bb325SJeff Bonwick * If we got an error on a leaf device, convert it to ENXIO 2621e14bb325SJeff Bonwick * if the device is not accessible at all. 2622e14bb325SJeff Bonwick */ 2623e14bb325SJeff Bonwick if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && 2624e14bb325SJeff Bonwick !vdev_accessible(vd, zio)) 2625be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(ENXIO); 2626e14bb325SJeff Bonwick 2627e14bb325SJeff Bonwick /* 2628e14bb325SJeff Bonwick * If we can't write to an interior vdev (mirror or RAID-Z), 2629e14bb325SJeff Bonwick * set vdev_cant_write so that we stop trying to allocate from it. 2630e14bb325SJeff Bonwick */ 2631e14bb325SJeff Bonwick if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && 26323b2aab18SMatthew Ahrens vd != NULL && !vd->vdev_ops->vdev_op_leaf) { 2633e14bb325SJeff Bonwick vd->vdev_cant_write = B_TRUE; 26343b2aab18SMatthew Ahrens } 2635e14bb325SJeff Bonwick 2636e14bb325SJeff Bonwick if (zio->io_error) 2637e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2638e14bb325SJeff Bonwick 263969962b56SMatthew Ahrens if (vd != NULL && vd->vdev_ops->vdev_op_leaf && 264069962b56SMatthew Ahrens zio->io_physdone != NULL) { 264169962b56SMatthew Ahrens ASSERT(!(zio->io_flags & ZIO_FLAG_DELEGATED)); 264269962b56SMatthew Ahrens ASSERT(zio->io_child_type == ZIO_CHILD_VDEV); 264369962b56SMatthew Ahrens zio->io_physdone(zio->io_logical); 264469962b56SMatthew Ahrens } 264569962b56SMatthew Ahrens 2646e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2647fa9e4066Sahrens } 2648fa9e4066Sahrens 2649fa9e4066Sahrens void 2650fa9e4066Sahrens zio_vdev_io_reissue(zio_t *zio) 2651fa9e4066Sahrens { 2652fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2653fa9e4066Sahrens ASSERT(zio->io_error == 0); 2654fa9e4066Sahrens 2655b24ab676SJeff Bonwick zio->io_stage >>= 1; 2656fa9e4066Sahrens } 2657fa9e4066Sahrens 2658fa9e4066Sahrens void 2659fa9e4066Sahrens zio_vdev_io_redone(zio_t *zio) 2660fa9e4066Sahrens { 2661fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); 2662fa9e4066Sahrens 2663b24ab676SJeff Bonwick zio->io_stage >>= 1; 2664fa9e4066Sahrens } 2665fa9e4066Sahrens 2666fa9e4066Sahrens void 2667fa9e4066Sahrens zio_vdev_io_bypass(zio_t *zio) 2668fa9e4066Sahrens { 2669fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2670fa9e4066Sahrens ASSERT(zio->io_error == 0); 2671fa9e4066Sahrens 2672fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_IO_BYPASS; 2673b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; 2674fa9e4066Sahrens } 2675fa9e4066Sahrens 2676fa9e4066Sahrens /* 2677fa9e4066Sahrens * ========================================================================== 2678fa9e4066Sahrens * Generate and verify checksums 2679fa9e4066Sahrens * ========================================================================== 2680fa9e4066Sahrens */ 2681e05725b1Sbonwick static int 2682fa9e4066Sahrens zio_checksum_generate(zio_t *zio) 2683fa9e4066Sahrens { 2684fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2685e14bb325SJeff Bonwick enum zio_checksum checksum; 2686fa9e4066Sahrens 2687e14bb325SJeff Bonwick if (bp == NULL) { 2688e14bb325SJeff Bonwick /* 2689e14bb325SJeff Bonwick * This is zio_write_phys(). 2690e14bb325SJeff Bonwick * We're either generating a label checksum, or none at all. 2691e14bb325SJeff Bonwick */ 2692e14bb325SJeff Bonwick checksum = zio->io_prop.zp_checksum; 2693e14bb325SJeff Bonwick 2694e14bb325SJeff Bonwick if (checksum == ZIO_CHECKSUM_OFF) 2695e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2696fa9e4066Sahrens 2697e14bb325SJeff Bonwick ASSERT(checksum == ZIO_CHECKSUM_LABEL); 2698e14bb325SJeff Bonwick } else { 2699e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { 2700e14bb325SJeff Bonwick ASSERT(!IO_IS_ALLOCATING(zio)); 2701e14bb325SJeff Bonwick checksum = ZIO_CHECKSUM_GANG_HEADER; 2702e14bb325SJeff Bonwick } else { 2703e14bb325SJeff Bonwick checksum = BP_GET_CHECKSUM(bp); 2704e14bb325SJeff Bonwick } 2705e14bb325SJeff Bonwick } 2706fa9e4066Sahrens 2707e14bb325SJeff Bonwick zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); 2708fa9e4066Sahrens 2709e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2710fa9e4066Sahrens } 2711fa9e4066Sahrens 2712e05725b1Sbonwick static int 2713e14bb325SJeff Bonwick zio_checksum_verify(zio_t *zio) 2714fa9e4066Sahrens { 271522fe2c88SJonathan Adams zio_bad_cksum_t info; 2716e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2717e14bb325SJeff Bonwick int error; 2718fa9e4066Sahrens 2719b24ab676SJeff Bonwick ASSERT(zio->io_vd != NULL); 2720b24ab676SJeff Bonwick 2721e14bb325SJeff Bonwick if (bp == NULL) { 2722e14bb325SJeff Bonwick /* 2723e14bb325SJeff Bonwick * This is zio_read_phys(). 2724e14bb325SJeff Bonwick * We're either verifying a label checksum, or nothing at all. 2725e14bb325SJeff Bonwick */ 2726e14bb325SJeff Bonwick if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) 2727e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2728fa9e4066Sahrens 2729e14bb325SJeff Bonwick ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); 2730e14bb325SJeff Bonwick } 2731fa9e4066Sahrens 273222fe2c88SJonathan Adams if ((error = zio_checksum_error(zio, &info)) != 0) { 2733e14bb325SJeff Bonwick zio->io_error = error; 2734e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { 273522fe2c88SJonathan Adams zfs_ereport_start_checksum(zio->io_spa, 273622fe2c88SJonathan Adams zio->io_vd, zio, zio->io_offset, 273722fe2c88SJonathan Adams zio->io_size, NULL, &info); 2738e14bb325SJeff Bonwick } 2739fa9e4066Sahrens } 2740fa9e4066Sahrens 2741e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2742fa9e4066Sahrens } 2743fa9e4066Sahrens 2744fa9e4066Sahrens /* 2745fa9e4066Sahrens * Called by RAID-Z to ensure we don't compute the checksum twice. 2746fa9e4066Sahrens */ 2747fa9e4066Sahrens void 2748fa9e4066Sahrens zio_checksum_verified(zio_t *zio) 2749fa9e4066Sahrens { 2750b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 2751fa9e4066Sahrens } 2752fa9e4066Sahrens 2753fa9e4066Sahrens /* 2754e14bb325SJeff Bonwick * ========================================================================== 2755e14bb325SJeff Bonwick * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. 2756e14bb325SJeff Bonwick * An error of 0 indictes success. ENXIO indicates whole-device failure, 2757e14bb325SJeff Bonwick * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO 2758e14bb325SJeff Bonwick * indicate errors that are specific to one I/O, and most likely permanent. 2759e14bb325SJeff Bonwick * Any other error is presumed to be worse because we weren't expecting it. 2760e14bb325SJeff Bonwick * ========================================================================== 2761fa9e4066Sahrens */ 2762e14bb325SJeff Bonwick int 2763e14bb325SJeff Bonwick zio_worst_error(int e1, int e2) 2764fa9e4066Sahrens { 2765e14bb325SJeff Bonwick static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; 2766e14bb325SJeff Bonwick int r1, r2; 2767e14bb325SJeff Bonwick 2768e14bb325SJeff Bonwick for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) 2769e14bb325SJeff Bonwick if (e1 == zio_error_rank[r1]) 2770e14bb325SJeff Bonwick break; 2771e14bb325SJeff Bonwick 2772e14bb325SJeff Bonwick for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) 2773e14bb325SJeff Bonwick if (e2 == zio_error_rank[r2]) 2774e14bb325SJeff Bonwick break; 277544cd46caSbillm 2776e14bb325SJeff Bonwick return (r1 > r2 ? e1 : e2); 2777fa9e4066Sahrens } 2778fa9e4066Sahrens 2779fa9e4066Sahrens /* 2780fa9e4066Sahrens * ========================================================================== 2781e14bb325SJeff Bonwick * I/O completion 2782fa9e4066Sahrens * ========================================================================== 2783fa9e4066Sahrens */ 2784e14bb325SJeff Bonwick static int 2785e14bb325SJeff Bonwick zio_ready(zio_t *zio) 2786fa9e4066Sahrens { 2787e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2788a3f829aeSBill Moore zio_t *pio, *pio_next; 2789fa9e4066Sahrens 2790b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 2791b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_READY)) 2792f5383399SBill Moore return (ZIO_PIPELINE_STOP); 2793fa9e4066Sahrens 2794f5383399SBill Moore if (zio->io_ready) { 2795e14bb325SJeff Bonwick ASSERT(IO_IS_ALLOCATING(zio)); 279680901aeaSGeorge Wilson ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp) || 279780901aeaSGeorge Wilson (zio->io_flags & ZIO_FLAG_NOPWRITE)); 2798e14bb325SJeff Bonwick ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); 2799fa9e4066Sahrens 2800e14bb325SJeff Bonwick zio->io_ready(zio); 2801e14bb325SJeff Bonwick } 2802fa9e4066Sahrens 2803e14bb325SJeff Bonwick if (bp != NULL && bp != &zio->io_bp_copy) 2804e14bb325SJeff Bonwick zio->io_bp_copy = *bp; 2805fa9e4066Sahrens 2806e14bb325SJeff Bonwick if (zio->io_error) 2807e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2808fa9e4066Sahrens 2809a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2810a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = 1; 2811a3f829aeSBill Moore pio = zio_walk_parents(zio); 2812a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2813a3f829aeSBill Moore 2814a3f829aeSBill Moore /* 2815a3f829aeSBill Moore * As we notify zio's parents, new parents could be added. 2816a3f829aeSBill Moore * New parents go to the head of zio's io_parent_list, however, 2817a3f829aeSBill Moore * so we will (correctly) not notify them. The remainder of zio's 2818a3f829aeSBill Moore * io_parent_list, from 'pio_next' onward, cannot change because 2819a3f829aeSBill Moore * all parents must wait for us to be done before they can be done. 2820a3f829aeSBill Moore */ 2821a3f829aeSBill Moore for (; pio != NULL; pio = pio_next) { 2822a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2823e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_READY); 2824a3f829aeSBill Moore } 2825fa9e4066Sahrens 2826b24ab676SJeff Bonwick if (zio->io_flags & ZIO_FLAG_NODATA) { 2827b24ab676SJeff Bonwick if (BP_IS_GANG(bp)) { 2828b24ab676SJeff Bonwick zio->io_flags &= ~ZIO_FLAG_NODATA; 2829b24ab676SJeff Bonwick } else { 2830b24ab676SJeff Bonwick ASSERT((uintptr_t)zio->io_data < SPA_MAXBLOCKSIZE); 2831b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 2832b24ab676SJeff Bonwick } 2833b24ab676SJeff Bonwick } 2834b24ab676SJeff Bonwick 2835a33cae98STim Haley if (zio_injection_enabled && 2836a33cae98STim Haley zio->io_spa->spa_syncing_txg == zio->io_txg) 2837a33cae98STim Haley zio_handle_ignored_writes(zio); 2838a33cae98STim Haley 2839e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2840fa9e4066Sahrens } 2841fa9e4066Sahrens 2842e14bb325SJeff Bonwick static int 2843e14bb325SJeff Bonwick zio_done(zio_t *zio) 2844d63d470bSgw { 2845e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 2846e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 2847e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2848e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2849e14bb325SJeff Bonwick uint64_t psize = zio->io_size; 2850a3f829aeSBill Moore zio_t *pio, *pio_next; 2851d63d470bSgw 2852e14bb325SJeff Bonwick /* 2853f5383399SBill Moore * If our children haven't all completed, 2854e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 2855e14bb325SJeff Bonwick */ 2856e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || 2857e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || 2858b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE) || 2859e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) 2860e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2861d63d470bSgw 2862e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 2863e14bb325SJeff Bonwick for (int w = 0; w < ZIO_WAIT_TYPES; w++) 2864e14bb325SJeff Bonwick ASSERT(zio->io_children[c][w] == 0); 2865e14bb325SJeff Bonwick 2866e14bb325SJeff Bonwick if (bp != NULL) { 2867e14bb325SJeff Bonwick ASSERT(bp->blk_pad[0] == 0); 2868e14bb325SJeff Bonwick ASSERT(bp->blk_pad[1] == 0); 2869e14bb325SJeff Bonwick ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || 2870a3f829aeSBill Moore (bp == zio_unique_parent(zio)->io_bp)); 2871e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && 2872b24ab676SJeff Bonwick zio->io_bp_override == NULL && 2873e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { 2874e14bb325SJeff Bonwick ASSERT(!BP_SHOULD_BYTESWAP(bp)); 2875b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(bp)); 2876e14bb325SJeff Bonwick ASSERT(BP_COUNT_GANG(bp) == 0 || 2877e14bb325SJeff Bonwick (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); 2878e14bb325SJeff Bonwick } 287980901aeaSGeorge Wilson if (zio->io_flags & ZIO_FLAG_NOPWRITE) 288080901aeaSGeorge Wilson VERIFY(BP_EQUAL(bp, &zio->io_bp_orig)); 2881e14bb325SJeff Bonwick } 2882fa9e4066Sahrens 2883e14bb325SJeff Bonwick /* 2884b24ab676SJeff Bonwick * If there were child vdev/gang/ddt errors, they apply to us now. 2885e14bb325SJeff Bonwick */ 2886e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); 2887e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_GANG); 2888b24ab676SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_DDT); 2889b24ab676SJeff Bonwick 2890b24ab676SJeff Bonwick /* 2891b24ab676SJeff Bonwick * If the I/O on the transformed data was successful, generate any 2892b24ab676SJeff Bonwick * checksum reports now while we still have the transformed data. 2893b24ab676SJeff Bonwick */ 2894b24ab676SJeff Bonwick if (zio->io_error == 0) { 2895b24ab676SJeff Bonwick while (zio->io_cksum_report != NULL) { 2896b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 2897b24ab676SJeff Bonwick uint64_t align = zcr->zcr_align; 2898b24ab676SJeff Bonwick uint64_t asize = P2ROUNDUP(psize, align); 2899b24ab676SJeff Bonwick char *abuf = zio->io_data; 2900b24ab676SJeff Bonwick 2901b24ab676SJeff Bonwick if (asize != psize) { 2902b24ab676SJeff Bonwick abuf = zio_buf_alloc(asize); 2903b24ab676SJeff Bonwick bcopy(zio->io_data, abuf, psize); 2904b24ab676SJeff Bonwick bzero(abuf + psize, asize - psize); 2905b24ab676SJeff Bonwick } 2906b24ab676SJeff Bonwick 2907b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 2908b24ab676SJeff Bonwick zcr->zcr_next = NULL; 2909b24ab676SJeff Bonwick zcr->zcr_finish(zcr, abuf); 2910b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 2911b24ab676SJeff Bonwick 2912b24ab676SJeff Bonwick if (asize != psize) 2913b24ab676SJeff Bonwick zio_buf_free(abuf, asize); 2914b24ab676SJeff Bonwick } 2915b24ab676SJeff Bonwick } 2916e14bb325SJeff Bonwick 2917e14bb325SJeff Bonwick zio_pop_transforms(zio); /* note: may set zio->io_error */ 2918e14bb325SJeff Bonwick 2919e14bb325SJeff Bonwick vdev_stat_update(zio, psize); 2920e14bb325SJeff Bonwick 2921e14bb325SJeff Bonwick if (zio->io_error) { 2922e14bb325SJeff Bonwick /* 2923e14bb325SJeff Bonwick * If this I/O is attached to a particular vdev, 2924e14bb325SJeff Bonwick * generate an error message describing the I/O failure 2925e14bb325SJeff Bonwick * at the block level. We ignore these errors if the 2926e14bb325SJeff Bonwick * device is currently unavailable. 2927e14bb325SJeff Bonwick */ 2928e14bb325SJeff Bonwick if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) 2929e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, zio, 0, 0); 2930e14bb325SJeff Bonwick 29318f18d1faSGeorge Wilson if ((zio->io_error == EIO || !(zio->io_flags & 29328f18d1faSGeorge Wilson (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && 29338f18d1faSGeorge Wilson zio == lio) { 2934e14bb325SJeff Bonwick /* 2935e14bb325SJeff Bonwick * For logical I/O requests, tell the SPA to log the 2936e14bb325SJeff Bonwick * error and generate a logical data ereport. 2937e14bb325SJeff Bonwick */ 2938e14bb325SJeff Bonwick spa_log_error(spa, zio); 2939e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, zio, 2940e14bb325SJeff Bonwick 0, 0); 2941e14bb325SJeff Bonwick } 2942e14bb325SJeff Bonwick } 2943fa9e4066Sahrens 2944e14bb325SJeff Bonwick if (zio->io_error && zio == lio) { 2945e14bb325SJeff Bonwick /* 2946e14bb325SJeff Bonwick * Determine whether zio should be reexecuted. This will 2947e14bb325SJeff Bonwick * propagate all the way to the root via zio_notify_parent(). 2948e14bb325SJeff Bonwick */ 2949e14bb325SJeff Bonwick ASSERT(vd == NULL && bp != NULL); 2950b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2951e14bb325SJeff Bonwick 2952b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(zio) && 2953b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_CANFAIL)) { 2954e14bb325SJeff Bonwick if (zio->io_error != ENOSPC) 2955e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_NOW; 2956e14bb325SJeff Bonwick else 2957e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2958b24ab676SJeff Bonwick } 2959e14bb325SJeff Bonwick 2960e14bb325SJeff Bonwick if ((zio->io_type == ZIO_TYPE_READ || 2961e14bb325SJeff Bonwick zio->io_type == ZIO_TYPE_FREE) && 296244ecc532SGeorge Wilson !(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && 2963e14bb325SJeff Bonwick zio->io_error == ENXIO && 2964b16da2e2SGeorge Wilson spa_load_state(spa) == SPA_LOAD_NONE && 2965e14bb325SJeff Bonwick spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) 2966e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2967e14bb325SJeff Bonwick 2968e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) 2969e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 297022fe2c88SJonathan Adams 297122fe2c88SJonathan Adams /* 297222fe2c88SJonathan Adams * Here is a possibly good place to attempt to do 297322fe2c88SJonathan Adams * either combinatorial reconstruction or error correction 297422fe2c88SJonathan Adams * based on checksums. It also might be a good place 297522fe2c88SJonathan Adams * to send out preliminary ereports before we suspend 297622fe2c88SJonathan Adams * processing. 297722fe2c88SJonathan Adams */ 2978d63d470bSgw } 2979d63d470bSgw 298067bd71c6Sperrin /* 2981e14bb325SJeff Bonwick * If there were logical child errors, they apply to us now. 2982e14bb325SJeff Bonwick * We defer this until now to avoid conflating logical child 2983e14bb325SJeff Bonwick * errors with errors that happened to the zio itself when 2984e14bb325SJeff Bonwick * updating vdev stats and reporting FMA events above. 298567bd71c6Sperrin */ 2986e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); 29878654d025Sperrin 2988b24ab676SJeff Bonwick if ((zio->io_error || zio->io_reexecute) && 2989b24ab676SJeff Bonwick IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && 299080901aeaSGeorge Wilson !(zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE))) 2991f5383399SBill Moore zio_dva_unallocate(zio, zio->io_gang_tree, bp); 2992f5383399SBill Moore 2993f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 2994f5383399SBill Moore 299533a372edSGeorge Wilson /* 299633a372edSGeorge Wilson * Godfather I/Os should never suspend. 299733a372edSGeorge Wilson */ 299833a372edSGeorge Wilson if ((zio->io_flags & ZIO_FLAG_GODFATHER) && 299933a372edSGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) 300033a372edSGeorge Wilson zio->io_reexecute = 0; 300133a372edSGeorge Wilson 300233a372edSGeorge Wilson if (zio->io_reexecute) { 3003e14bb325SJeff Bonwick /* 3004e14bb325SJeff Bonwick * This is a logical I/O that wants to reexecute. 3005e14bb325SJeff Bonwick * 3006e14bb325SJeff Bonwick * Reexecute is top-down. When an i/o fails, if it's not 3007e14bb325SJeff Bonwick * the root, it simply notifies its parent and sticks around. 3008e14bb325SJeff Bonwick * The parent, seeing that it still has children in zio_done(), 3009e14bb325SJeff Bonwick * does the same. This percolates all the way up to the root. 3010e14bb325SJeff Bonwick * The root i/o will reexecute or suspend the entire tree. 3011e14bb325SJeff Bonwick * 3012e14bb325SJeff Bonwick * This approach ensures that zio_reexecute() honors 3013e14bb325SJeff Bonwick * all the original i/o dependency relationships, e.g. 3014e14bb325SJeff Bonwick * parents not executing until children are ready. 3015e14bb325SJeff Bonwick */ 3016e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 3017fa9e4066Sahrens 3018f5383399SBill Moore zio->io_gang_leader = NULL; 3019e14bb325SJeff Bonwick 3020a3f829aeSBill Moore mutex_enter(&zio->io_lock); 3021a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 3022a3f829aeSBill Moore mutex_exit(&zio->io_lock); 3023a3f829aeSBill Moore 302454d692b7SGeorge Wilson /* 302554d692b7SGeorge Wilson * "The Godfather" I/O monitors its children but is 302654d692b7SGeorge Wilson * not a true parent to them. It will track them through 302754d692b7SGeorge Wilson * the pipeline but severs its ties whenever they get into 302854d692b7SGeorge Wilson * trouble (e.g. suspended). This allows "The Godfather" 302954d692b7SGeorge Wilson * I/O to return status without blocking. 303054d692b7SGeorge Wilson */ 303154d692b7SGeorge Wilson for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 303254d692b7SGeorge Wilson zio_link_t *zl = zio->io_walk_link; 303354d692b7SGeorge Wilson pio_next = zio_walk_parents(zio); 303454d692b7SGeorge Wilson 303554d692b7SGeorge Wilson if ((pio->io_flags & ZIO_FLAG_GODFATHER) && 303654d692b7SGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { 303754d692b7SGeorge Wilson zio_remove_child(pio, zio, zl); 303854d692b7SGeorge Wilson zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 303954d692b7SGeorge Wilson } 304054d692b7SGeorge Wilson } 304154d692b7SGeorge Wilson 3042a3f829aeSBill Moore if ((pio = zio_unique_parent(zio)) != NULL) { 3043e14bb325SJeff Bonwick /* 3044e14bb325SJeff Bonwick * We're not a root i/o, so there's nothing to do 3045e14bb325SJeff Bonwick * but notify our parent. Don't propagate errors 3046e14bb325SJeff Bonwick * upward since we haven't permanently failed yet. 3047e14bb325SJeff Bonwick */ 304833a372edSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 3049e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; 3050e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 3051e14bb325SJeff Bonwick } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { 3052e14bb325SJeff Bonwick /* 3053e14bb325SJeff Bonwick * We'd fail again if we reexecuted now, so suspend 3054e14bb325SJeff Bonwick * until conditions improve (e.g. device comes online). 3055e14bb325SJeff Bonwick */ 3056e14bb325SJeff Bonwick zio_suspend(spa, zio); 3057e14bb325SJeff Bonwick } else { 3058e14bb325SJeff Bonwick /* 3059e14bb325SJeff Bonwick * Reexecution is potentially a huge amount of work. 3060e14bb325SJeff Bonwick * Hand it off to the otherwise-unused claim taskq. 3061e14bb325SJeff Bonwick */ 30625aeb9474SGarrett D'Amore ASSERT(zio->io_tqent.tqent_next == NULL); 3063ec94d322SAdam Leventhal spa_taskq_dispatch_ent(spa, ZIO_TYPE_CLAIM, 3064ec94d322SAdam Leventhal ZIO_TASKQ_ISSUE, (task_func_t *)zio_reexecute, zio, 3065ec94d322SAdam Leventhal 0, &zio->io_tqent); 3066e14bb325SJeff Bonwick } 3067e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3068fa9e4066Sahrens } 3069fa9e4066Sahrens 3070b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 307133a372edSGeorge Wilson ASSERT(zio->io_reexecute == 0); 3072e14bb325SJeff Bonwick ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); 3073fa9e4066Sahrens 3074b24ab676SJeff Bonwick /* 3075b24ab676SJeff Bonwick * Report any checksum errors, since the I/O is complete. 3076b24ab676SJeff Bonwick */ 307722fe2c88SJonathan Adams while (zio->io_cksum_report != NULL) { 3078b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 3079b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 3080b24ab676SJeff Bonwick zcr->zcr_next = NULL; 3081b24ab676SJeff Bonwick zcr->zcr_finish(zcr, NULL); 3082b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 308322fe2c88SJonathan Adams } 308422fe2c88SJonathan Adams 3085a3f829aeSBill Moore /* 3086a3f829aeSBill Moore * It is the responsibility of the done callback to ensure that this 3087a3f829aeSBill Moore * particular zio is no longer discoverable for adoption, and as 3088a3f829aeSBill Moore * such, cannot acquire any new parents. 3089a3f829aeSBill Moore */ 3090e14bb325SJeff Bonwick if (zio->io_done) 3091e14bb325SJeff Bonwick zio->io_done(zio); 3092fa9e4066Sahrens 3093a3f829aeSBill Moore mutex_enter(&zio->io_lock); 3094a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 3095a3f829aeSBill Moore mutex_exit(&zio->io_lock); 3096fa9e4066Sahrens 3097a3f829aeSBill Moore for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 3098a3f829aeSBill Moore zio_link_t *zl = zio->io_walk_link; 3099a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 3100a3f829aeSBill Moore zio_remove_child(pio, zio, zl); 3101e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 3102e14bb325SJeff Bonwick } 3103fa9e4066Sahrens 3104e14bb325SJeff Bonwick if (zio->io_waiter != NULL) { 3105e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 3106e14bb325SJeff Bonwick zio->io_executor = NULL; 3107e14bb325SJeff Bonwick cv_broadcast(&zio->io_cv); 3108e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 3109e14bb325SJeff Bonwick } else { 3110e14bb325SJeff Bonwick zio_destroy(zio); 3111e14bb325SJeff Bonwick } 3112fa9e4066Sahrens 3113e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3114fa9e4066Sahrens } 311546341222Sperrin 311646341222Sperrin /* 3117e14bb325SJeff Bonwick * ========================================================================== 3118e14bb325SJeff Bonwick * I/O pipeline definition 3119e14bb325SJeff Bonwick * ========================================================================== 312046341222Sperrin */ 3121b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[] = { 3122e14bb325SJeff Bonwick NULL, 3123e14bb325SJeff Bonwick zio_read_bp_init, 3124b24ab676SJeff Bonwick zio_free_bp_init, 3125b24ab676SJeff Bonwick zio_issue_async, 3126e14bb325SJeff Bonwick zio_write_bp_init, 3127e14bb325SJeff Bonwick zio_checksum_generate, 312880901aeaSGeorge Wilson zio_nop_write, 3129b24ab676SJeff Bonwick zio_ddt_read_start, 3130b24ab676SJeff Bonwick zio_ddt_read_done, 3131b24ab676SJeff Bonwick zio_ddt_write, 3132b24ab676SJeff Bonwick zio_ddt_free, 3133e14bb325SJeff Bonwick zio_gang_assemble, 3134e14bb325SJeff Bonwick zio_gang_issue, 3135e14bb325SJeff Bonwick zio_dva_allocate, 3136e14bb325SJeff Bonwick zio_dva_free, 3137e14bb325SJeff Bonwick zio_dva_claim, 3138e14bb325SJeff Bonwick zio_ready, 3139e14bb325SJeff Bonwick zio_vdev_io_start, 3140e14bb325SJeff Bonwick zio_vdev_io_done, 3141e14bb325SJeff Bonwick zio_vdev_io_assess, 3142e14bb325SJeff Bonwick zio_checksum_verify, 3143e14bb325SJeff Bonwick zio_done 3144e14bb325SJeff Bonwick }; 3145ad135b5dSChristopher Siden 3146ad135b5dSChristopher Siden /* dnp is the dnode for zb1->zb_object */ 3147ad135b5dSChristopher Siden boolean_t 3148ad135b5dSChristopher Siden zbookmark_is_before(const dnode_phys_t *dnp, const zbookmark_t *zb1, 3149ad135b5dSChristopher Siden const zbookmark_t *zb2) 3150ad135b5dSChristopher Siden { 3151ad135b5dSChristopher Siden uint64_t zb1nextL0, zb2thisobj; 3152ad135b5dSChristopher Siden 3153ad135b5dSChristopher Siden ASSERT(zb1->zb_objset == zb2->zb_objset); 3154ad135b5dSChristopher Siden ASSERT(zb2->zb_level == 0); 3155ad135b5dSChristopher Siden 3156ad135b5dSChristopher Siden /* 3157ad135b5dSChristopher Siden * A bookmark in the deadlist is considered to be after 3158ad135b5dSChristopher Siden * everything else. 3159ad135b5dSChristopher Siden */ 3160ad135b5dSChristopher Siden if (zb2->zb_object == DMU_DEADLIST_OBJECT) 3161ad135b5dSChristopher Siden return (B_TRUE); 3162ad135b5dSChristopher Siden 3163ad135b5dSChristopher Siden /* The objset_phys_t isn't before anything. */ 3164ad135b5dSChristopher Siden if (dnp == NULL) 3165ad135b5dSChristopher Siden return (B_FALSE); 3166ad135b5dSChristopher Siden 3167ad135b5dSChristopher Siden zb1nextL0 = (zb1->zb_blkid + 1) << 3168ad135b5dSChristopher Siden ((zb1->zb_level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)); 3169ad135b5dSChristopher Siden 3170ad135b5dSChristopher Siden zb2thisobj = zb2->zb_object ? zb2->zb_object : 3171ad135b5dSChristopher Siden zb2->zb_blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT); 3172ad135b5dSChristopher Siden 3173ad135b5dSChristopher Siden if (zb1->zb_object == DMU_META_DNODE_OBJECT) { 3174ad135b5dSChristopher Siden uint64_t nextobj = zb1nextL0 * 3175ad135b5dSChristopher Siden (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT) >> DNODE_SHIFT; 3176ad135b5dSChristopher Siden return (nextobj <= zb2thisobj); 3177ad135b5dSChristopher Siden } 3178ad135b5dSChristopher Siden 3179ad135b5dSChristopher Siden if (zb1->zb_object < zb2thisobj) 3180ad135b5dSChristopher Siden return (B_TRUE); 3181ad135b5dSChristopher Siden if (zb1->zb_object > zb2thisobj) 3182ad135b5dSChristopher Siden return (B_FALSE); 3183ad135b5dSChristopher Siden if (zb2->zb_object == DMU_META_DNODE_OBJECT) 3184ad135b5dSChristopher Siden return (B_FALSE); 3185ad135b5dSChristopher Siden return (zb1nextL0 <= zb2->zb_blkid); 3186ad135b5dSChristopher Siden } 3187