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. 23bf16b11eSMatthew Ahrens * Copyright (c) 2011, 2014 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*5d7b4d43SMatthew Ahrens #include <sys/blkptr.h> 4043466aaeSMax Grossman #include <sys/zfeature.h> 41fa9e4066Sahrens 42fa9e4066Sahrens /* 43fa9e4066Sahrens * ========================================================================== 44fa9e4066Sahrens * I/O type descriptions 45fa9e4066Sahrens * ========================================================================== 46fa9e4066Sahrens */ 4769962b56SMatthew Ahrens const char *zio_type_name[ZIO_TYPES] = { 4880eb36f2SGeorge Wilson "zio_null", "zio_read", "zio_write", "zio_free", "zio_claim", 4980eb36f2SGeorge Wilson "zio_ioctl" 5080eb36f2SGeorge Wilson }; 51fa9e4066Sahrens 52fa9e4066Sahrens /* 53fa9e4066Sahrens * ========================================================================== 54fa9e4066Sahrens * I/O kmem caches 55fa9e4066Sahrens * ========================================================================== 56fa9e4066Sahrens */ 57ccae0b50Seschrock kmem_cache_t *zio_cache; 58a3f829aeSBill Moore kmem_cache_t *zio_link_cache; 59fa9e4066Sahrens kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 60ad23a2dbSjohansen kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 61ad23a2dbSjohansen 62ad23a2dbSjohansen #ifdef _KERNEL 63ad23a2dbSjohansen extern vmem_t *zio_alloc_arena; 64ad23a2dbSjohansen #endif 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 171ea8dc4b6Seschrock zio_inject_init(); 172fa9e4066Sahrens } 173fa9e4066Sahrens 174fa9e4066Sahrens void 175fa9e4066Sahrens zio_fini(void) 176fa9e4066Sahrens { 177fa9e4066Sahrens size_t c; 178fa9e4066Sahrens kmem_cache_t *last_cache = NULL; 179ad23a2dbSjohansen kmem_cache_t *last_data_cache = NULL; 180fa9e4066Sahrens 181fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 182fa9e4066Sahrens if (zio_buf_cache[c] != last_cache) { 183fa9e4066Sahrens last_cache = zio_buf_cache[c]; 184fa9e4066Sahrens kmem_cache_destroy(zio_buf_cache[c]); 185fa9e4066Sahrens } 186fa9e4066Sahrens zio_buf_cache[c] = NULL; 187ad23a2dbSjohansen 188ad23a2dbSjohansen if (zio_data_buf_cache[c] != last_data_cache) { 189ad23a2dbSjohansen last_data_cache = zio_data_buf_cache[c]; 190ad23a2dbSjohansen kmem_cache_destroy(zio_data_buf_cache[c]); 191ad23a2dbSjohansen } 192ad23a2dbSjohansen zio_data_buf_cache[c] = NULL; 193fa9e4066Sahrens } 194ea8dc4b6Seschrock 195a3f829aeSBill Moore kmem_cache_destroy(zio_link_cache); 196ccae0b50Seschrock kmem_cache_destroy(zio_cache); 197ccae0b50Seschrock 198ea8dc4b6Seschrock zio_inject_fini(); 199fa9e4066Sahrens } 200fa9e4066Sahrens 201fa9e4066Sahrens /* 202fa9e4066Sahrens * ========================================================================== 203fa9e4066Sahrens * Allocate and free I/O buffers 204fa9e4066Sahrens * ========================================================================== 205fa9e4066Sahrens */ 206ad23a2dbSjohansen 207ad23a2dbSjohansen /* 208ad23a2dbSjohansen * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a 209ad23a2dbSjohansen * crashdump if the kernel panics, so use it judiciously. Obviously, it's 210ad23a2dbSjohansen * useful to inspect ZFS metadata, but if possible, we should avoid keeping 211ad23a2dbSjohansen * excess / transient data in-core during a crashdump. 212ad23a2dbSjohansen */ 213fa9e4066Sahrens void * 214fa9e4066Sahrens zio_buf_alloc(size_t size) 215fa9e4066Sahrens { 216fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 217fa9e4066Sahrens 218*5d7b4d43SMatthew Ahrens ASSERT3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 219fa9e4066Sahrens 2201ab7f2deSmaybee return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); 221fa9e4066Sahrens } 222fa9e4066Sahrens 223ad23a2dbSjohansen /* 224ad23a2dbSjohansen * Use zio_data_buf_alloc to allocate data. The data will not appear in a 225ad23a2dbSjohansen * crashdump if the kernel panics. This exists so that we will limit the amount 226ad23a2dbSjohansen * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount 227ad23a2dbSjohansen * of kernel heap dumped to disk when the kernel panics) 228ad23a2dbSjohansen */ 229ad23a2dbSjohansen void * 230ad23a2dbSjohansen zio_data_buf_alloc(size_t size) 231ad23a2dbSjohansen { 232ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 233ad23a2dbSjohansen 234ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 235ad23a2dbSjohansen 2361ab7f2deSmaybee return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); 237ad23a2dbSjohansen } 238ad23a2dbSjohansen 239fa9e4066Sahrens void 240fa9e4066Sahrens zio_buf_free(void *buf, size_t size) 241fa9e4066Sahrens { 242fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 243fa9e4066Sahrens 244fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 245fa9e4066Sahrens 246fa9e4066Sahrens kmem_cache_free(zio_buf_cache[c], buf); 247fa9e4066Sahrens } 248fa9e4066Sahrens 249ad23a2dbSjohansen void 250ad23a2dbSjohansen zio_data_buf_free(void *buf, size_t size) 251ad23a2dbSjohansen { 252ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 253ad23a2dbSjohansen 254ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 255ad23a2dbSjohansen 256ad23a2dbSjohansen kmem_cache_free(zio_data_buf_cache[c], buf); 257ad23a2dbSjohansen } 258b3995adbSahrens 259fa9e4066Sahrens /* 260fa9e4066Sahrens * ========================================================================== 261fa9e4066Sahrens * Push and pop I/O transform buffers 262fa9e4066Sahrens * ========================================================================== 263fa9e4066Sahrens */ 264fa9e4066Sahrens static void 265e14bb325SJeff Bonwick zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, 266e14bb325SJeff Bonwick zio_transform_func_t *transform) 267fa9e4066Sahrens { 268fa9e4066Sahrens zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); 269fa9e4066Sahrens 270e14bb325SJeff Bonwick zt->zt_orig_data = zio->io_data; 271e14bb325SJeff Bonwick zt->zt_orig_size = zio->io_size; 272fa9e4066Sahrens zt->zt_bufsize = bufsize; 273e14bb325SJeff Bonwick zt->zt_transform = transform; 274fa9e4066Sahrens 275fa9e4066Sahrens zt->zt_next = zio->io_transform_stack; 276fa9e4066Sahrens zio->io_transform_stack = zt; 277fa9e4066Sahrens 278fa9e4066Sahrens zio->io_data = data; 279fa9e4066Sahrens zio->io_size = size; 280fa9e4066Sahrens } 281fa9e4066Sahrens 282fa9e4066Sahrens static void 283e14bb325SJeff Bonwick zio_pop_transforms(zio_t *zio) 284fa9e4066Sahrens { 285e14bb325SJeff Bonwick zio_transform_t *zt; 286e14bb325SJeff Bonwick 287e14bb325SJeff Bonwick while ((zt = zio->io_transform_stack) != NULL) { 288e14bb325SJeff Bonwick if (zt->zt_transform != NULL) 289e14bb325SJeff Bonwick zt->zt_transform(zio, 290e14bb325SJeff Bonwick zt->zt_orig_data, zt->zt_orig_size); 291fa9e4066Sahrens 292b24ab676SJeff Bonwick if (zt->zt_bufsize != 0) 293b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zt->zt_bufsize); 294fa9e4066Sahrens 295e14bb325SJeff Bonwick zio->io_data = zt->zt_orig_data; 296e14bb325SJeff Bonwick zio->io_size = zt->zt_orig_size; 297e14bb325SJeff Bonwick zio->io_transform_stack = zt->zt_next; 298fa9e4066Sahrens 299e14bb325SJeff Bonwick kmem_free(zt, sizeof (zio_transform_t)); 300fa9e4066Sahrens } 301fa9e4066Sahrens } 302fa9e4066Sahrens 303e14bb325SJeff Bonwick /* 304e14bb325SJeff Bonwick * ========================================================================== 305e14bb325SJeff Bonwick * I/O transform callbacks for subblocks and decompression 306e14bb325SJeff Bonwick * ========================================================================== 307e14bb325SJeff Bonwick */ 308e14bb325SJeff Bonwick static void 309e14bb325SJeff Bonwick zio_subblock(zio_t *zio, void *data, uint64_t size) 310e14bb325SJeff Bonwick { 311e14bb325SJeff Bonwick ASSERT(zio->io_size > size); 312e14bb325SJeff Bonwick 313e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ) 314e14bb325SJeff Bonwick bcopy(zio->io_data, data, size); 315e14bb325SJeff Bonwick } 316e14bb325SJeff Bonwick 317e14bb325SJeff Bonwick static void 318e14bb325SJeff Bonwick zio_decompress(zio_t *zio, void *data, uint64_t size) 319e14bb325SJeff Bonwick { 320e14bb325SJeff Bonwick if (zio->io_error == 0 && 321e14bb325SJeff Bonwick zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), 322b24ab676SJeff Bonwick zio->io_data, data, zio->io_size, size) != 0) 323be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(EIO); 324e14bb325SJeff Bonwick } 325e14bb325SJeff Bonwick 326e14bb325SJeff Bonwick /* 327e14bb325SJeff Bonwick * ========================================================================== 328e14bb325SJeff Bonwick * I/O parent/child relationships and pipeline interlocks 329e14bb325SJeff Bonwick * ========================================================================== 330e14bb325SJeff Bonwick */ 331a3f829aeSBill Moore /* 332a3f829aeSBill Moore * NOTE - Callers to zio_walk_parents() and zio_walk_children must 333a3f829aeSBill Moore * continue calling these functions until they return NULL. 334a3f829aeSBill Moore * Otherwise, the next caller will pick up the list walk in 335a3f829aeSBill Moore * some indeterminate state. (Otherwise every caller would 336a3f829aeSBill Moore * have to pass in a cookie to keep the state represented by 337a3f829aeSBill Moore * io_walk_link, which gets annoying.) 338a3f829aeSBill Moore */ 339a3f829aeSBill Moore zio_t * 340a3f829aeSBill Moore zio_walk_parents(zio_t *cio) 341a3f829aeSBill Moore { 342a3f829aeSBill Moore zio_link_t *zl = cio->io_walk_link; 343a3f829aeSBill Moore list_t *pl = &cio->io_parent_list; 344e14bb325SJeff Bonwick 345a3f829aeSBill Moore zl = (zl == NULL) ? list_head(pl) : list_next(pl, zl); 346a3f829aeSBill Moore cio->io_walk_link = zl; 347a3f829aeSBill Moore 348a3f829aeSBill Moore if (zl == NULL) 349a3f829aeSBill Moore return (NULL); 350a3f829aeSBill Moore 351a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 352a3f829aeSBill Moore return (zl->zl_parent); 353a3f829aeSBill Moore } 354a3f829aeSBill Moore 355a3f829aeSBill Moore zio_t * 356a3f829aeSBill Moore zio_walk_children(zio_t *pio) 357a3f829aeSBill Moore { 358a3f829aeSBill Moore zio_link_t *zl = pio->io_walk_link; 359a3f829aeSBill Moore list_t *cl = &pio->io_child_list; 360a3f829aeSBill Moore 361a3f829aeSBill Moore zl = (zl == NULL) ? list_head(cl) : list_next(cl, zl); 362a3f829aeSBill Moore pio->io_walk_link = zl; 363a3f829aeSBill Moore 364a3f829aeSBill Moore if (zl == NULL) 365a3f829aeSBill Moore return (NULL); 366a3f829aeSBill Moore 367a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 368a3f829aeSBill Moore return (zl->zl_child); 369a3f829aeSBill Moore } 370a3f829aeSBill Moore 371a3f829aeSBill Moore zio_t * 372a3f829aeSBill Moore zio_unique_parent(zio_t *cio) 373a3f829aeSBill Moore { 374a3f829aeSBill Moore zio_t *pio = zio_walk_parents(cio); 375a3f829aeSBill Moore 376a3f829aeSBill Moore VERIFY(zio_walk_parents(cio) == NULL); 377a3f829aeSBill Moore return (pio); 378a3f829aeSBill Moore } 379a3f829aeSBill Moore 380a3f829aeSBill Moore void 381a3f829aeSBill Moore zio_add_child(zio_t *pio, zio_t *cio) 382e14bb325SJeff Bonwick { 383a3f829aeSBill Moore zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); 384a3f829aeSBill Moore 385a3f829aeSBill Moore /* 386a3f829aeSBill Moore * Logical I/Os can have logical, gang, or vdev children. 387a3f829aeSBill Moore * Gang I/Os can have gang or vdev children. 388a3f829aeSBill Moore * Vdev I/Os can only have vdev children. 389a3f829aeSBill Moore * The following ASSERT captures all of these constraints. 390a3f829aeSBill Moore */ 391a3f829aeSBill Moore ASSERT(cio->io_child_type <= pio->io_child_type); 392a3f829aeSBill Moore 393a3f829aeSBill Moore zl->zl_parent = pio; 394a3f829aeSBill Moore zl->zl_child = cio; 395a3f829aeSBill Moore 396a3f829aeSBill Moore mutex_enter(&cio->io_lock); 397e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 398a3f829aeSBill Moore 399a3f829aeSBill Moore ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); 400a3f829aeSBill Moore 401a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 402a3f829aeSBill Moore pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; 403a3f829aeSBill Moore 404a3f829aeSBill Moore list_insert_head(&pio->io_child_list, zl); 405a3f829aeSBill Moore list_insert_head(&cio->io_parent_list, zl); 406a3f829aeSBill Moore 407b24ab676SJeff Bonwick pio->io_child_count++; 408b24ab676SJeff Bonwick cio->io_parent_count++; 409b24ab676SJeff Bonwick 410e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 411a3f829aeSBill Moore mutex_exit(&cio->io_lock); 412e14bb325SJeff Bonwick } 413e14bb325SJeff Bonwick 414fa9e4066Sahrens static void 415a3f829aeSBill Moore zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) 416e14bb325SJeff Bonwick { 417a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 418a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 419e14bb325SJeff Bonwick 420a3f829aeSBill Moore mutex_enter(&cio->io_lock); 421e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 422a3f829aeSBill Moore 423a3f829aeSBill Moore list_remove(&pio->io_child_list, zl); 424a3f829aeSBill Moore list_remove(&cio->io_parent_list, zl); 425a3f829aeSBill Moore 426b24ab676SJeff Bonwick pio->io_child_count--; 427b24ab676SJeff Bonwick cio->io_parent_count--; 428b24ab676SJeff Bonwick 429e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 430a3f829aeSBill Moore mutex_exit(&cio->io_lock); 431a3f829aeSBill Moore 432a3f829aeSBill Moore kmem_cache_free(zio_link_cache, zl); 433e14bb325SJeff Bonwick } 434e14bb325SJeff Bonwick 435e14bb325SJeff Bonwick static boolean_t 436e14bb325SJeff Bonwick zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) 437fa9e4066Sahrens { 438e14bb325SJeff Bonwick uint64_t *countp = &zio->io_children[child][wait]; 439e14bb325SJeff Bonwick boolean_t waiting = B_FALSE; 440e14bb325SJeff Bonwick 441e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 442e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 443e14bb325SJeff Bonwick if (*countp != 0) { 444b24ab676SJeff Bonwick zio->io_stage >>= 1; 445e14bb325SJeff Bonwick zio->io_stall = countp; 446e14bb325SJeff Bonwick waiting = B_TRUE; 447e14bb325SJeff Bonwick } 448e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 449e14bb325SJeff Bonwick 450e14bb325SJeff Bonwick return (waiting); 451e14bb325SJeff Bonwick } 452fa9e4066Sahrens 453e14bb325SJeff Bonwick static void 454e14bb325SJeff Bonwick zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) 455e14bb325SJeff Bonwick { 456e14bb325SJeff Bonwick uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; 457e14bb325SJeff Bonwick int *errorp = &pio->io_child_error[zio->io_child_type]; 458fa9e4066Sahrens 459e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 460e14bb325SJeff Bonwick if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 461e14bb325SJeff Bonwick *errorp = zio_worst_error(*errorp, zio->io_error); 462e14bb325SJeff Bonwick pio->io_reexecute |= zio->io_reexecute; 463e14bb325SJeff Bonwick ASSERT3U(*countp, >, 0); 46469962b56SMatthew Ahrens 46569962b56SMatthew Ahrens (*countp)--; 46669962b56SMatthew Ahrens 46769962b56SMatthew Ahrens if (*countp == 0 && pio->io_stall == countp) { 468e14bb325SJeff Bonwick pio->io_stall = NULL; 469e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 470e14bb325SJeff Bonwick zio_execute(pio); 471e14bb325SJeff Bonwick } else { 472e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 473fa9e4066Sahrens } 474fa9e4066Sahrens } 475fa9e4066Sahrens 476e14bb325SJeff Bonwick static void 477e14bb325SJeff Bonwick zio_inherit_child_errors(zio_t *zio, enum zio_child c) 478e14bb325SJeff Bonwick { 479e14bb325SJeff Bonwick if (zio->io_child_error[c] != 0 && zio->io_error == 0) 480e14bb325SJeff Bonwick zio->io_error = zio->io_child_error[c]; 481e14bb325SJeff Bonwick } 482e14bb325SJeff Bonwick 483fa9e4066Sahrens /* 484fa9e4066Sahrens * ========================================================================== 485e14bb325SJeff Bonwick * Create the various types of I/O (read, write, free, etc) 486fa9e4066Sahrens * ========================================================================== 487fa9e4066Sahrens */ 488fa9e4066Sahrens static zio_t * 489b24ab676SJeff Bonwick zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 490fa9e4066Sahrens void *data, uint64_t size, zio_done_func_t *done, void *private, 49169962b56SMatthew Ahrens zio_type_t type, zio_priority_t priority, enum zio_flag flags, 492b24ab676SJeff Bonwick vdev_t *vd, uint64_t offset, const zbookmark_t *zb, 493b24ab676SJeff Bonwick enum zio_stage stage, enum zio_stage pipeline) 494fa9e4066Sahrens { 495fa9e4066Sahrens zio_t *zio; 496fa9e4066Sahrens 497fa9e4066Sahrens ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); 498fa9e4066Sahrens ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); 499e14bb325SJeff Bonwick ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); 500fa9e4066Sahrens 501e14bb325SJeff Bonwick ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); 502e14bb325SJeff Bonwick ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); 503e14bb325SJeff Bonwick ASSERT(vd || stage == ZIO_STAGE_OPEN); 504088f3894Sahrens 505ccae0b50Seschrock zio = kmem_cache_alloc(zio_cache, KM_SLEEP); 506ccae0b50Seschrock bzero(zio, sizeof (zio_t)); 507e14bb325SJeff Bonwick 508e14bb325SJeff Bonwick mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); 509e14bb325SJeff Bonwick cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); 510e14bb325SJeff Bonwick 511a3f829aeSBill Moore list_create(&zio->io_parent_list, sizeof (zio_link_t), 512a3f829aeSBill Moore offsetof(zio_link_t, zl_parent_node)); 513a3f829aeSBill Moore list_create(&zio->io_child_list, sizeof (zio_link_t), 514a3f829aeSBill Moore offsetof(zio_link_t, zl_child_node)); 515a3f829aeSBill Moore 516e14bb325SJeff Bonwick if (vd != NULL) 517e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_VDEV; 518e14bb325SJeff Bonwick else if (flags & ZIO_FLAG_GANG_CHILD) 519e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_GANG; 520b24ab676SJeff Bonwick else if (flags & ZIO_FLAG_DDT_CHILD) 521b24ab676SJeff Bonwick zio->io_child_type = ZIO_CHILD_DDT; 522e14bb325SJeff Bonwick else 523e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_LOGICAL; 524e14bb325SJeff Bonwick 525fa9e4066Sahrens if (bp != NULL) { 526b24ab676SJeff Bonwick zio->io_bp = (blkptr_t *)bp; 527fa9e4066Sahrens zio->io_bp_copy = *bp; 528fa9e4066Sahrens zio->io_bp_orig = *bp; 529b24ab676SJeff Bonwick if (type != ZIO_TYPE_WRITE || 530b24ab676SJeff Bonwick zio->io_child_type == ZIO_CHILD_DDT) 531e14bb325SJeff Bonwick zio->io_bp = &zio->io_bp_copy; /* so caller can free */ 532f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL) 533e14bb325SJeff Bonwick zio->io_logical = zio; 534f5383399SBill Moore if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) 535f5383399SBill Moore pipeline |= ZIO_GANG_STAGES; 536fa9e4066Sahrens } 537e14bb325SJeff Bonwick 538e14bb325SJeff Bonwick zio->io_spa = spa; 539e14bb325SJeff Bonwick zio->io_txg = txg; 540fa9e4066Sahrens zio->io_done = done; 541fa9e4066Sahrens zio->io_private = private; 542fa9e4066Sahrens zio->io_type = type; 543fa9e4066Sahrens zio->io_priority = priority; 544e14bb325SJeff Bonwick zio->io_vd = vd; 545e14bb325SJeff Bonwick zio->io_offset = offset; 546b24ab676SJeff Bonwick zio->io_orig_data = zio->io_data = data; 547b24ab676SJeff Bonwick zio->io_orig_size = zio->io_size = size; 548e14bb325SJeff Bonwick zio->io_orig_flags = zio->io_flags = flags; 549e14bb325SJeff Bonwick zio->io_orig_stage = zio->io_stage = stage; 550e14bb325SJeff Bonwick zio->io_orig_pipeline = zio->io_pipeline = pipeline; 551fa9e4066Sahrens 552a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); 553a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); 554a3f829aeSBill Moore 555e14bb325SJeff Bonwick if (zb != NULL) 556e14bb325SJeff Bonwick zio->io_bookmark = *zb; 557e14bb325SJeff Bonwick 558e14bb325SJeff Bonwick if (pio != NULL) { 559e14bb325SJeff Bonwick if (zio->io_logical == NULL) 560ea8dc4b6Seschrock zio->io_logical = pio->io_logical; 561f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_GANG) 562f5383399SBill Moore zio->io_gang_leader = pio->io_gang_leader; 563e14bb325SJeff Bonwick zio_add_child(pio, zio); 564fa9e4066Sahrens } 565fa9e4066Sahrens 566fa9e4066Sahrens return (zio); 567fa9e4066Sahrens } 568fa9e4066Sahrens 5690a4e9518Sgw static void 570e14bb325SJeff Bonwick zio_destroy(zio_t *zio) 5710a4e9518Sgw { 572a3f829aeSBill Moore list_destroy(&zio->io_parent_list); 573a3f829aeSBill Moore list_destroy(&zio->io_child_list); 574e14bb325SJeff Bonwick mutex_destroy(&zio->io_lock); 575e14bb325SJeff Bonwick cv_destroy(&zio->io_cv); 576e14bb325SJeff Bonwick kmem_cache_free(zio_cache, zio); 5770a4e9518Sgw } 5780a4e9518Sgw 579fa9e4066Sahrens zio_t * 580a3f829aeSBill Moore zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, 581b24ab676SJeff Bonwick void *private, enum zio_flag flags) 582fa9e4066Sahrens { 583fa9e4066Sahrens zio_t *zio; 584fa9e4066Sahrens 585fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 586a3f829aeSBill Moore ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 587e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); 588fa9e4066Sahrens 589fa9e4066Sahrens return (zio); 590fa9e4066Sahrens } 591fa9e4066Sahrens 592fa9e4066Sahrens zio_t * 593b24ab676SJeff Bonwick zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) 594fa9e4066Sahrens { 595a3f829aeSBill Moore return (zio_null(NULL, spa, NULL, done, private, flags)); 596fa9e4066Sahrens } 597fa9e4066Sahrens 598fa9e4066Sahrens zio_t * 599e14bb325SJeff Bonwick zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 600e14bb325SJeff Bonwick void *data, uint64_t size, zio_done_func_t *done, void *private, 60169962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb) 602fa9e4066Sahrens { 603fa9e4066Sahrens zio_t *zio; 604fa9e4066Sahrens 605b24ab676SJeff Bonwick zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, 606088f3894Sahrens data, size, done, private, 607e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, NULL, 0, zb, 608b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 609b24ab676SJeff Bonwick ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); 610fa9e4066Sahrens 611fa9e4066Sahrens return (zio); 612fa9e4066Sahrens } 613fa9e4066Sahrens 614fa9e4066Sahrens zio_t * 615e14bb325SJeff Bonwick zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 616b24ab676SJeff Bonwick void *data, uint64_t size, const zio_prop_t *zp, 61769962b56SMatthew Ahrens zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done, 61869962b56SMatthew Ahrens void *private, 61969962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb) 620fa9e4066Sahrens { 621fa9e4066Sahrens zio_t *zio; 622fa9e4066Sahrens 623e14bb325SJeff Bonwick ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && 624e14bb325SJeff Bonwick zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && 625e14bb325SJeff Bonwick zp->zp_compress >= ZIO_COMPRESS_OFF && 626e14bb325SJeff Bonwick zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && 627ad135b5dSChristopher Siden DMU_OT_IS_VALID(zp->zp_type) && 628e14bb325SJeff Bonwick zp->zp_level < 32 && 629b24ab676SJeff Bonwick zp->zp_copies > 0 && 63080901aeaSGeorge Wilson zp->zp_copies <= spa_max_replication(spa)); 6310a4e9518Sgw 632fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 633e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 634b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 635b24ab676SJeff Bonwick ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); 636fa9e4066Sahrens 637c717a561Smaybee zio->io_ready = ready; 63869962b56SMatthew Ahrens zio->io_physdone = physdone; 639e14bb325SJeff Bonwick zio->io_prop = *zp; 640fa9e4066Sahrens 641*5d7b4d43SMatthew Ahrens /* 642*5d7b4d43SMatthew Ahrens * Data can be NULL if we are going to call zio_write_override() to 643*5d7b4d43SMatthew Ahrens * provide the already-allocated BP. But we may need the data to 644*5d7b4d43SMatthew Ahrens * verify a dedup hit (if requested). In this case, don't try to 645*5d7b4d43SMatthew Ahrens * dedup (just take the already-allocated BP verbatim). 646*5d7b4d43SMatthew Ahrens */ 647*5d7b4d43SMatthew Ahrens if (data == NULL && zio->io_prop.zp_dedup_verify) { 648*5d7b4d43SMatthew Ahrens zio->io_prop.zp_dedup = zio->io_prop.zp_dedup_verify = B_FALSE; 649*5d7b4d43SMatthew Ahrens } 650*5d7b4d43SMatthew Ahrens 651fa9e4066Sahrens return (zio); 652fa9e4066Sahrens } 653fa9e4066Sahrens 654fa9e4066Sahrens zio_t * 655e14bb325SJeff Bonwick zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, 65669962b56SMatthew Ahrens uint64_t size, zio_done_func_t *done, void *private, 65769962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, zbookmark_t *zb) 658fa9e4066Sahrens { 659fa9e4066Sahrens zio_t *zio; 660fa9e4066Sahrens 661fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 662e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 663e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); 664fa9e4066Sahrens 665fa9e4066Sahrens return (zio); 666fa9e4066Sahrens } 667fa9e4066Sahrens 668b24ab676SJeff Bonwick void 66980901aeaSGeorge Wilson zio_write_override(zio_t *zio, blkptr_t *bp, int copies, boolean_t nopwrite) 670b24ab676SJeff Bonwick { 671b24ab676SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 672b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 673b24ab676SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 674b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); 675b24ab676SJeff Bonwick 67680901aeaSGeorge Wilson /* 67780901aeaSGeorge Wilson * We must reset the io_prop to match the values that existed 67880901aeaSGeorge Wilson * when the bp was first written by dmu_sync() keeping in mind 67980901aeaSGeorge Wilson * that nopwrite and dedup are mutually exclusive. 68080901aeaSGeorge Wilson */ 68180901aeaSGeorge Wilson zio->io_prop.zp_dedup = nopwrite ? B_FALSE : zio->io_prop.zp_dedup; 68280901aeaSGeorge Wilson zio->io_prop.zp_nopwrite = nopwrite; 683b24ab676SJeff Bonwick zio->io_prop.zp_copies = copies; 684b24ab676SJeff Bonwick zio->io_bp_override = bp; 685b24ab676SJeff Bonwick } 686b24ab676SJeff Bonwick 687b24ab676SJeff Bonwick void 688b24ab676SJeff Bonwick zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) 689b24ab676SJeff Bonwick { 690*5d7b4d43SMatthew Ahrens 691*5d7b4d43SMatthew Ahrens /* 692*5d7b4d43SMatthew Ahrens * The check for EMBEDDED is a performance optimization. We 693*5d7b4d43SMatthew Ahrens * process the free here (by ignoring it) rather than 694*5d7b4d43SMatthew Ahrens * putting it on the list and then processing it in zio_free_sync(). 695*5d7b4d43SMatthew Ahrens */ 696*5d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 697*5d7b4d43SMatthew Ahrens return; 6983b2aab18SMatthew Ahrens metaslab_check_free(spa, bp); 6999cb154a3SMatthew Ahrens 7009cb154a3SMatthew Ahrens /* 7019cb154a3SMatthew Ahrens * Frees that are for the currently-syncing txg, are not going to be 7029cb154a3SMatthew Ahrens * deferred, and which will not need to do a read (i.e. not GANG or 7039cb154a3SMatthew Ahrens * DEDUP), can be processed immediately. Otherwise, put them on the 7049cb154a3SMatthew Ahrens * in-memory list for later processing. 7059cb154a3SMatthew Ahrens */ 7069cb154a3SMatthew Ahrens if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp) || 7079cb154a3SMatthew Ahrens txg != spa->spa_syncing_txg || 7089cb154a3SMatthew Ahrens spa_sync_pass(spa) >= zfs_sync_pass_deferred_free) { 7099cb154a3SMatthew Ahrens bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp); 7109cb154a3SMatthew Ahrens } else { 7119cb154a3SMatthew Ahrens VERIFY0(zio_wait(zio_free_sync(NULL, spa, txg, bp, 0))); 7129cb154a3SMatthew Ahrens } 713b24ab676SJeff Bonwick } 714b24ab676SJeff Bonwick 715fa9e4066Sahrens zio_t * 716b24ab676SJeff Bonwick zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 717b24ab676SJeff Bonwick enum zio_flag flags) 718fa9e4066Sahrens { 719fa9e4066Sahrens zio_t *zio; 7209cb154a3SMatthew Ahrens enum zio_stage stage = ZIO_FREE_PIPELINE; 721fa9e4066Sahrens 722fa9e4066Sahrens ASSERT(!BP_IS_HOLE(bp)); 723b24ab676SJeff Bonwick ASSERT(spa_syncing_txg(spa) == txg); 72401f55e48SGeorge Wilson ASSERT(spa_sync_pass(spa) < zfs_sync_pass_deferred_free); 725fa9e4066Sahrens 726*5d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 727*5d7b4d43SMatthew Ahrens return (zio_null(pio, spa, NULL, NULL, NULL, 0)); 728*5d7b4d43SMatthew Ahrens 7293b2aab18SMatthew Ahrens metaslab_check_free(spa, bp); 7306e6d5868SMatthew Ahrens arc_freed(spa, bp); 7313b2aab18SMatthew Ahrens 7329cb154a3SMatthew Ahrens /* 7339cb154a3SMatthew Ahrens * GANG and DEDUP blocks can induce a read (for the gang block header, 7349cb154a3SMatthew Ahrens * or the DDT), so issue them asynchronously so that this thread is 7359cb154a3SMatthew Ahrens * not tied up. 7369cb154a3SMatthew Ahrens */ 7379cb154a3SMatthew Ahrens if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp)) 7389cb154a3SMatthew Ahrens stage |= ZIO_STAGE_ISSUE_ASYNC; 7399cb154a3SMatthew Ahrens 740e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 74169962b56SMatthew Ahrens NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_NOW, flags, 7429cb154a3SMatthew Ahrens NULL, 0, NULL, ZIO_STAGE_OPEN, stage); 7439cb154a3SMatthew Ahrens 744fa9e4066Sahrens return (zio); 745fa9e4066Sahrens } 746fa9e4066Sahrens 747fa9e4066Sahrens zio_t * 748b24ab676SJeff Bonwick zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 749b24ab676SJeff Bonwick zio_done_func_t *done, void *private, enum zio_flag flags) 750fa9e4066Sahrens { 751fa9e4066Sahrens zio_t *zio; 752fa9e4066Sahrens 753*5d7b4d43SMatthew Ahrens dprintf_bp(bp, "claiming in txg %llu", txg); 754*5d7b4d43SMatthew Ahrens 755*5d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 756*5d7b4d43SMatthew Ahrens return (zio_null(pio, spa, NULL, NULL, NULL, 0)); 757*5d7b4d43SMatthew Ahrens 758fa9e4066Sahrens /* 759fa9e4066Sahrens * A claim is an allocation of a specific block. Claims are needed 760fa9e4066Sahrens * to support immediate writes in the intent log. The issue is that 761fa9e4066Sahrens * immediate writes contain committed data, but in a txg that was 762fa9e4066Sahrens * *not* committed. Upon opening the pool after an unclean shutdown, 763fa9e4066Sahrens * the intent log claims all blocks that contain immediate write data 764fa9e4066Sahrens * so that the SPA knows they're in use. 765fa9e4066Sahrens * 766fa9e4066Sahrens * All claims *must* be resolved in the first txg -- before the SPA 767fa9e4066Sahrens * starts allocating blocks -- so that nothing is allocated twice. 768b24ab676SJeff Bonwick * If txg == 0 we just verify that the block is claimable. 769fa9e4066Sahrens */ 770fa9e4066Sahrens ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); 771b24ab676SJeff Bonwick ASSERT(txg == spa_first_txg(spa) || txg == 0); 772b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ 773fa9e4066Sahrens 774e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 775e14bb325SJeff Bonwick done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, 776e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); 777fa9e4066Sahrens 778fa9e4066Sahrens return (zio); 779fa9e4066Sahrens } 780fa9e4066Sahrens 781fa9e4066Sahrens zio_t * 782fa9e4066Sahrens zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 78369962b56SMatthew Ahrens zio_done_func_t *done, void *private, enum zio_flag flags) 784fa9e4066Sahrens { 785fa9e4066Sahrens zio_t *zio; 786fa9e4066Sahrens int c; 787fa9e4066Sahrens 788fa9e4066Sahrens if (vd->vdev_children == 0) { 789fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 79069962b56SMatthew Ahrens ZIO_TYPE_IOCTL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 791fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); 792fa9e4066Sahrens 793fa9e4066Sahrens zio->io_cmd = cmd; 794fa9e4066Sahrens } else { 795a3f829aeSBill Moore zio = zio_null(pio, spa, NULL, NULL, NULL, flags); 796fa9e4066Sahrens 797fa9e4066Sahrens for (c = 0; c < vd->vdev_children; c++) 798fa9e4066Sahrens zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, 79969962b56SMatthew Ahrens done, private, flags)); 800fa9e4066Sahrens } 801fa9e4066Sahrens 802fa9e4066Sahrens return (zio); 803fa9e4066Sahrens } 804fa9e4066Sahrens 805fa9e4066Sahrens zio_t * 806fa9e4066Sahrens zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 807fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 80869962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, boolean_t labels) 809fa9e4066Sahrens { 810fa9e4066Sahrens zio_t *zio; 8110a4e9518Sgw 812e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 813e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 814e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 815e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 816fa9e4066Sahrens 817e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 818e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, vd, offset, NULL, 819fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); 820fa9e4066Sahrens 821e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 822fa9e4066Sahrens 823fa9e4066Sahrens return (zio); 824fa9e4066Sahrens } 825fa9e4066Sahrens 826fa9e4066Sahrens zio_t * 827fa9e4066Sahrens zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 828fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 82969962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, boolean_t labels) 830fa9e4066Sahrens { 831fa9e4066Sahrens zio_t *zio; 8320a4e9518Sgw 833e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 834e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 835e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 836e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 837fa9e4066Sahrens 838e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 839e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL, 840fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); 841fa9e4066Sahrens 842e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 843fa9e4066Sahrens 8446e1f5caaSNeil Perrin if (zio_checksum_table[checksum].ci_eck) { 845fa9e4066Sahrens /* 8466e1f5caaSNeil Perrin * zec checksums are necessarily destructive -- they modify 847e14bb325SJeff Bonwick * the end of the write buffer to hold the verifier/checksum. 848fa9e4066Sahrens * Therefore, we must make a local copy in case the data is 849e14bb325SJeff Bonwick * being written to multiple places in parallel. 850fa9e4066Sahrens */ 851e14bb325SJeff Bonwick void *wbuf = zio_buf_alloc(size); 852fa9e4066Sahrens bcopy(data, wbuf, size); 853e14bb325SJeff Bonwick zio_push_transform(zio, wbuf, size, size, NULL); 854fa9e4066Sahrens } 855fa9e4066Sahrens 856fa9e4066Sahrens return (zio); 857fa9e4066Sahrens } 858fa9e4066Sahrens 859fa9e4066Sahrens /* 860e14bb325SJeff Bonwick * Create a child I/O to do some work for us. 861fa9e4066Sahrens */ 862fa9e4066Sahrens zio_t * 863e14bb325SJeff Bonwick zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, 86469962b56SMatthew Ahrens void *data, uint64_t size, int type, zio_priority_t priority, 86569962b56SMatthew Ahrens enum zio_flag flags, zio_done_func_t *done, void *private) 866fa9e4066Sahrens { 867b24ab676SJeff Bonwick enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; 868e14bb325SJeff Bonwick zio_t *zio; 869e14bb325SJeff Bonwick 870e14bb325SJeff Bonwick ASSERT(vd->vdev_parent == 871e14bb325SJeff Bonwick (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); 872fa9e4066Sahrens 873fa9e4066Sahrens if (type == ZIO_TYPE_READ && bp != NULL) { 874fa9e4066Sahrens /* 875fa9e4066Sahrens * If we have the bp, then the child should perform the 876fa9e4066Sahrens * checksum and the parent need not. This pushes error 877fa9e4066Sahrens * detection as close to the leaves as possible and 878fa9e4066Sahrens * eliminates redundant checksums in the interior nodes. 879fa9e4066Sahrens */ 880b24ab676SJeff Bonwick pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; 881b24ab676SJeff Bonwick pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 882fa9e4066Sahrens } 883fa9e4066Sahrens 884e14bb325SJeff Bonwick if (vd->vdev_children == 0) 885e14bb325SJeff Bonwick offset += VDEV_LABEL_START_SIZE; 886e14bb325SJeff Bonwick 887b24ab676SJeff Bonwick flags |= ZIO_VDEV_CHILD_FLAGS(pio) | ZIO_FLAG_DONT_PROPAGATE; 888b24ab676SJeff Bonwick 889b24ab676SJeff Bonwick /* 890b24ab676SJeff Bonwick * If we've decided to do a repair, the write is not speculative -- 891b24ab676SJeff Bonwick * even if the original read was. 892b24ab676SJeff Bonwick */ 893b24ab676SJeff Bonwick if (flags & ZIO_FLAG_IO_REPAIR) 894b24ab676SJeff Bonwick flags &= ~ZIO_FLAG_SPECULATIVE; 895b24ab676SJeff Bonwick 896e14bb325SJeff Bonwick zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, 897b24ab676SJeff Bonwick done, private, type, priority, flags, vd, offset, &pio->io_bookmark, 898b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, pipeline); 899fa9e4066Sahrens 90069962b56SMatthew Ahrens zio->io_physdone = pio->io_physdone; 90169962b56SMatthew Ahrens if (vd->vdev_ops->vdev_op_leaf && zio->io_logical != NULL) 90269962b56SMatthew Ahrens zio->io_logical->io_phys_children++; 90369962b56SMatthew Ahrens 904e14bb325SJeff Bonwick return (zio); 90532b87932Sek } 90632b87932Sek 907e14bb325SJeff Bonwick zio_t * 908e14bb325SJeff Bonwick zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, 90969962b56SMatthew Ahrens int type, zio_priority_t priority, enum zio_flag flags, 910b24ab676SJeff Bonwick zio_done_func_t *done, void *private) 911fa9e4066Sahrens { 912e14bb325SJeff Bonwick zio_t *zio; 913fa9e4066Sahrens 914e14bb325SJeff Bonwick ASSERT(vd->vdev_ops->vdev_op_leaf); 915fa9e4066Sahrens 916e14bb325SJeff Bonwick zio = zio_create(NULL, vd->vdev_spa, 0, NULL, 917e14bb325SJeff Bonwick data, size, done, private, type, priority, 91869962b56SMatthew Ahrens flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY | ZIO_FLAG_DELEGATED, 919e14bb325SJeff Bonwick vd, offset, NULL, 920b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); 921fa9e4066Sahrens 922e14bb325SJeff Bonwick return (zio); 923e05725b1Sbonwick } 924e05725b1Sbonwick 925e05725b1Sbonwick void 926e14bb325SJeff Bonwick zio_flush(zio_t *zio, vdev_t *vd) 927e05725b1Sbonwick { 928e14bb325SJeff Bonwick zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, 92969962b56SMatthew Ahrens NULL, NULL, 930e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); 931fa9e4066Sahrens } 932fa9e4066Sahrens 9336e1f5caaSNeil Perrin void 9346e1f5caaSNeil Perrin zio_shrink(zio_t *zio, uint64_t size) 9356e1f5caaSNeil Perrin { 9366e1f5caaSNeil Perrin ASSERT(zio->io_executor == NULL); 9376e1f5caaSNeil Perrin ASSERT(zio->io_orig_size == zio->io_size); 9386e1f5caaSNeil Perrin ASSERT(size <= zio->io_size); 9396e1f5caaSNeil Perrin 9406e1f5caaSNeil Perrin /* 9416e1f5caaSNeil Perrin * We don't shrink for raidz because of problems with the 9426e1f5caaSNeil Perrin * reconstruction when reading back less than the block size. 9436e1f5caaSNeil Perrin * Note, BP_IS_RAIDZ() assumes no compression. 9446e1f5caaSNeil Perrin */ 9456e1f5caaSNeil Perrin ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); 9466e1f5caaSNeil Perrin if (!BP_IS_RAIDZ(zio->io_bp)) 9476e1f5caaSNeil Perrin zio->io_orig_size = zio->io_size = size; 9486e1f5caaSNeil Perrin } 9496e1f5caaSNeil Perrin 950fa9e4066Sahrens /* 951fa9e4066Sahrens * ========================================================================== 952e14bb325SJeff Bonwick * Prepare to read and write logical blocks 953fa9e4066Sahrens * ========================================================================== 954fa9e4066Sahrens */ 955e14bb325SJeff Bonwick 956e05725b1Sbonwick static int 957e14bb325SJeff Bonwick zio_read_bp_init(zio_t *zio) 958fa9e4066Sahrens { 959e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 960e05725b1Sbonwick 96103361682SJeff Bonwick if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && 962f5383399SBill Moore zio->io_child_type == ZIO_CHILD_LOGICAL && 963f5383399SBill Moore !(zio->io_flags & ZIO_FLAG_RAW)) { 964*5d7b4d43SMatthew Ahrens uint64_t psize = 965*5d7b4d43SMatthew Ahrens BP_IS_EMBEDDED(bp) ? BPE_GET_PSIZE(bp) : BP_GET_PSIZE(bp); 966b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(psize); 967e05725b1Sbonwick 968b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, psize, zio_decompress); 969e14bb325SJeff Bonwick } 970fa9e4066Sahrens 971*5d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp) && BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA) { 972*5d7b4d43SMatthew Ahrens zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 973*5d7b4d43SMatthew Ahrens decode_embedded_bp_compressed(bp, zio->io_data); 974*5d7b4d43SMatthew Ahrens } else { 975*5d7b4d43SMatthew Ahrens ASSERT(!BP_IS_EMBEDDED(bp)); 976*5d7b4d43SMatthew Ahrens } 977*5d7b4d43SMatthew Ahrens 978ad135b5dSChristopher Siden if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) && BP_GET_LEVEL(bp) == 0) 979e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 980fa9e4066Sahrens 981bbfd46c4SJeff Bonwick if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) 982bbfd46c4SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 983bbfd46c4SJeff Bonwick 984b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) 985b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_READ_PIPELINE; 986b24ab676SJeff Bonwick 987e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 988fa9e4066Sahrens } 989fa9e4066Sahrens 990e05725b1Sbonwick static int 991e14bb325SJeff Bonwick zio_write_bp_init(zio_t *zio) 9920a4e9518Sgw { 993b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 994e14bb325SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 995b24ab676SJeff Bonwick enum zio_compress compress = zp->zp_compress; 996e05725b1Sbonwick blkptr_t *bp = zio->io_bp; 997e14bb325SJeff Bonwick uint64_t lsize = zio->io_size; 998b24ab676SJeff Bonwick uint64_t psize = lsize; 999e14bb325SJeff Bonwick int pass = 1; 1000e05725b1Sbonwick 1001e14bb325SJeff Bonwick /* 1002e14bb325SJeff Bonwick * If our children haven't all reached the ready stage, 1003e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 1004e14bb325SJeff Bonwick */ 1005e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 1006e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) 1007e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 10080a4e9518Sgw 1009e14bb325SJeff Bonwick if (!IO_IS_ALLOCATING(zio)) 1010e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 10110a4e9518Sgw 1012b24ab676SJeff Bonwick ASSERT(zio->io_child_type != ZIO_CHILD_DDT); 1013b24ab676SJeff Bonwick 1014b24ab676SJeff Bonwick if (zio->io_bp_override) { 1015b24ab676SJeff Bonwick ASSERT(bp->blk_birth != zio->io_txg); 1016b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); 1017b24ab676SJeff Bonwick 1018b24ab676SJeff Bonwick *bp = *zio->io_bp_override; 1019b24ab676SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1020b24ab676SJeff Bonwick 1021*5d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 1022*5d7b4d43SMatthew Ahrens return (ZIO_PIPELINE_CONTINUE); 1023*5d7b4d43SMatthew Ahrens 102480901aeaSGeorge Wilson /* 102580901aeaSGeorge Wilson * If we've been overridden and nopwrite is set then 102680901aeaSGeorge Wilson * set the flag accordingly to indicate that a nopwrite 102780901aeaSGeorge Wilson * has already occurred. 102880901aeaSGeorge Wilson */ 102980901aeaSGeorge Wilson if (!BP_IS_HOLE(bp) && zp->zp_nopwrite) { 103080901aeaSGeorge Wilson ASSERT(!zp->zp_dedup); 103180901aeaSGeorge Wilson zio->io_flags |= ZIO_FLAG_NOPWRITE; 103280901aeaSGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 103380901aeaSGeorge Wilson } 103480901aeaSGeorge Wilson 103580901aeaSGeorge Wilson ASSERT(!zp->zp_nopwrite); 103680901aeaSGeorge Wilson 1037b24ab676SJeff Bonwick if (BP_IS_HOLE(bp) || !zp->zp_dedup) 1038b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1039b24ab676SJeff Bonwick 1040b24ab676SJeff Bonwick ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup || 1041b24ab676SJeff Bonwick zp->zp_dedup_verify); 1042b24ab676SJeff Bonwick 1043b24ab676SJeff Bonwick if (BP_GET_CHECKSUM(bp) == zp->zp_checksum) { 1044b24ab676SJeff Bonwick BP_SET_DEDUP(bp, 1); 1045b24ab676SJeff Bonwick zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; 1046b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1047b24ab676SJeff Bonwick } 1048b24ab676SJeff Bonwick zio->io_bp_override = NULL; 1049b24ab676SJeff Bonwick BP_ZERO(bp); 1050b24ab676SJeff Bonwick } 10510a4e9518Sgw 105243466aaeSMax Grossman if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg) { 1053e14bb325SJeff Bonwick /* 1054e14bb325SJeff Bonwick * We're rewriting an existing block, which means we're 1055e14bb325SJeff Bonwick * working on behalf of spa_sync(). For spa_sync() to 1056e14bb325SJeff Bonwick * converge, it must eventually be the case that we don't 1057e14bb325SJeff Bonwick * have to allocate new blocks. But compression changes 1058e14bb325SJeff Bonwick * the blocksize, which forces a reallocate, and makes 1059e14bb325SJeff Bonwick * convergence take longer. Therefore, after the first 1060e14bb325SJeff Bonwick * few passes, stop compressing to ensure convergence. 1061e14bb325SJeff Bonwick */ 1062b24ab676SJeff Bonwick pass = spa_sync_pass(spa); 1063b24ab676SJeff Bonwick 1064b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(spa)); 1065b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1066b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp)); 1067e05725b1Sbonwick 106801f55e48SGeorge Wilson if (pass >= zfs_sync_pass_dont_compress) 1069e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 1070e05725b1Sbonwick 1071e14bb325SJeff Bonwick /* Make sure someone doesn't change their mind on overwrites */ 1072*5d7b4d43SMatthew Ahrens ASSERT(BP_IS_EMBEDDED(bp) || MIN(zp->zp_copies + BP_IS_GANG(bp), 1073b24ab676SJeff Bonwick spa_max_replication(spa)) == BP_GET_NDVAS(bp)); 1074e14bb325SJeff Bonwick } 1075fa9e4066Sahrens 1076e14bb325SJeff Bonwick if (compress != ZIO_COMPRESS_OFF) { 1077b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(lsize); 1078b24ab676SJeff Bonwick psize = zio_compress_data(compress, zio->io_data, cbuf, lsize); 1079b24ab676SJeff Bonwick if (psize == 0 || psize == lsize) { 1080e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 1081b24ab676SJeff Bonwick zio_buf_free(cbuf, lsize); 1082*5d7b4d43SMatthew Ahrens } else if (!zp->zp_dedup && psize <= BPE_PAYLOAD_SIZE && 1083*5d7b4d43SMatthew Ahrens zp->zp_level == 0 && !DMU_OT_HAS_FILL(zp->zp_type) && 1084*5d7b4d43SMatthew Ahrens spa_feature_is_enabled(spa, SPA_FEATURE_EMBEDDED_DATA)) { 1085*5d7b4d43SMatthew Ahrens encode_embedded_bp_compressed(bp, 1086*5d7b4d43SMatthew Ahrens cbuf, compress, lsize, psize); 1087*5d7b4d43SMatthew Ahrens BPE_SET_ETYPE(bp, BP_EMBEDDED_TYPE_DATA); 1088*5d7b4d43SMatthew Ahrens BP_SET_TYPE(bp, zio->io_prop.zp_type); 1089*5d7b4d43SMatthew Ahrens BP_SET_LEVEL(bp, zio->io_prop.zp_level); 1090*5d7b4d43SMatthew Ahrens zio_buf_free(cbuf, lsize); 1091*5d7b4d43SMatthew Ahrens bp->blk_birth = zio->io_txg; 1092*5d7b4d43SMatthew Ahrens zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1093*5d7b4d43SMatthew Ahrens ASSERT(spa_feature_is_active(spa, 1094*5d7b4d43SMatthew Ahrens SPA_FEATURE_EMBEDDED_DATA)); 1095*5d7b4d43SMatthew Ahrens return (ZIO_PIPELINE_CONTINUE); 1096b24ab676SJeff Bonwick } else { 1097*5d7b4d43SMatthew Ahrens /* 1098*5d7b4d43SMatthew Ahrens * Round up compressed size to MINBLOCKSIZE and 1099*5d7b4d43SMatthew Ahrens * zero the tail. 1100*5d7b4d43SMatthew Ahrens */ 1101*5d7b4d43SMatthew Ahrens size_t rounded = 1102*5d7b4d43SMatthew Ahrens P2ROUNDUP(psize, (size_t)SPA_MINBLOCKSIZE); 1103*5d7b4d43SMatthew Ahrens if (rounded > psize) { 1104*5d7b4d43SMatthew Ahrens bzero((char *)cbuf + psize, rounded - psize); 1105*5d7b4d43SMatthew Ahrens psize = rounded; 1106*5d7b4d43SMatthew Ahrens } 1107*5d7b4d43SMatthew Ahrens if (psize == lsize) { 1108*5d7b4d43SMatthew Ahrens compress = ZIO_COMPRESS_OFF; 1109*5d7b4d43SMatthew Ahrens zio_buf_free(cbuf, lsize); 1110*5d7b4d43SMatthew Ahrens } else { 1111*5d7b4d43SMatthew Ahrens zio_push_transform(zio, cbuf, 1112*5d7b4d43SMatthew Ahrens psize, lsize, NULL); 1113*5d7b4d43SMatthew Ahrens } 1114e14bb325SJeff Bonwick } 1115e14bb325SJeff Bonwick } 1116c717a561Smaybee 1117e14bb325SJeff Bonwick /* 1118e14bb325SJeff Bonwick * The final pass of spa_sync() must be all rewrites, but the first 1119e14bb325SJeff Bonwick * few passes offer a trade-off: allocating blocks defers convergence, 1120e14bb325SJeff Bonwick * but newly allocated blocks are sequential, so they can be written 1121e14bb325SJeff Bonwick * to disk faster. Therefore, we allow the first few passes of 1122e14bb325SJeff Bonwick * spa_sync() to allocate new blocks, but force rewrites after that. 1123e14bb325SJeff Bonwick * There should only be a handful of blocks after pass 1 in any case. 1124e14bb325SJeff Bonwick */ 112543466aaeSMax Grossman if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg && 112643466aaeSMax Grossman BP_GET_PSIZE(bp) == psize && 112701f55e48SGeorge Wilson pass >= zfs_sync_pass_rewrite) { 1128b24ab676SJeff Bonwick ASSERT(psize != 0); 1129b24ab676SJeff Bonwick enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; 1130e14bb325SJeff Bonwick zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; 1131e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_REWRITE; 1132e14bb325SJeff Bonwick } else { 1133e14bb325SJeff Bonwick BP_ZERO(bp); 1134e14bb325SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 1135e14bb325SJeff Bonwick } 1136fa9e4066Sahrens 1137b24ab676SJeff Bonwick if (psize == 0) { 113843466aaeSMax Grossman if (zio->io_bp_orig.blk_birth != 0 && 113943466aaeSMax Grossman spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { 114043466aaeSMax Grossman BP_SET_LSIZE(bp, lsize); 114143466aaeSMax Grossman BP_SET_TYPE(bp, zp->zp_type); 114243466aaeSMax Grossman BP_SET_LEVEL(bp, zp->zp_level); 114343466aaeSMax Grossman BP_SET_BIRTH(bp, zio->io_txg, 0); 114443466aaeSMax Grossman } 1145e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1146e14bb325SJeff Bonwick } else { 1147e14bb325SJeff Bonwick ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); 1148e14bb325SJeff Bonwick BP_SET_LSIZE(bp, lsize); 114943466aaeSMax Grossman BP_SET_TYPE(bp, zp->zp_type); 115043466aaeSMax Grossman BP_SET_LEVEL(bp, zp->zp_level); 1151b24ab676SJeff Bonwick BP_SET_PSIZE(bp, psize); 1152e14bb325SJeff Bonwick BP_SET_COMPRESS(bp, compress); 1153e14bb325SJeff Bonwick BP_SET_CHECKSUM(bp, zp->zp_checksum); 1154b24ab676SJeff Bonwick BP_SET_DEDUP(bp, zp->zp_dedup); 1155e14bb325SJeff Bonwick BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 1156b24ab676SJeff Bonwick if (zp->zp_dedup) { 1157b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1158b24ab676SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 1159b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; 1160b24ab676SJeff Bonwick } 116180901aeaSGeorge Wilson if (zp->zp_nopwrite) { 116280901aeaSGeorge Wilson ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 116380901aeaSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 116480901aeaSGeorge Wilson zio->io_pipeline |= ZIO_STAGE_NOP_WRITE; 116580901aeaSGeorge Wilson } 1166b24ab676SJeff Bonwick } 1167b24ab676SJeff Bonwick 1168b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1169b24ab676SJeff Bonwick } 1170b24ab676SJeff Bonwick 1171b24ab676SJeff Bonwick static int 1172b24ab676SJeff Bonwick zio_free_bp_init(zio_t *zio) 1173b24ab676SJeff Bonwick { 1174b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1175b24ab676SJeff Bonwick 1176b24ab676SJeff Bonwick if (zio->io_child_type == ZIO_CHILD_LOGICAL) { 1177b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp)) 1178b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; 1179e14bb325SJeff Bonwick } 1180fa9e4066Sahrens 1181e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1182fa9e4066Sahrens } 1183fa9e4066Sahrens 1184e14bb325SJeff Bonwick /* 1185e14bb325SJeff Bonwick * ========================================================================== 1186e14bb325SJeff Bonwick * Execute the I/O pipeline 1187e14bb325SJeff Bonwick * ========================================================================== 1188e14bb325SJeff Bonwick */ 1189e14bb325SJeff Bonwick 1190e14bb325SJeff Bonwick static void 1191ec94d322SAdam Leventhal zio_taskq_dispatch(zio_t *zio, zio_taskq_type_t q, boolean_t cutinline) 1192fa9e4066Sahrens { 119380eb36f2SGeorge Wilson spa_t *spa = zio->io_spa; 1194e14bb325SJeff Bonwick zio_type_t t = zio->io_type; 11955aeb9474SGarrett D'Amore int flags = (cutinline ? TQ_FRONT : 0); 11960a4e9518Sgw 11970a4e9518Sgw /* 1198bbe36defSGeorge Wilson * If we're a config writer or a probe, the normal issue and 1199bbe36defSGeorge Wilson * interrupt threads may all be blocked waiting for the config lock. 1200bbe36defSGeorge Wilson * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. 12010a4e9518Sgw */ 1202bbe36defSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) 1203e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 12040a4e9518Sgw 12050a4e9518Sgw /* 1206e14bb325SJeff Bonwick * A similar issue exists for the L2ARC write thread until L2ARC 2.0. 12070a4e9518Sgw */ 1208e14bb325SJeff Bonwick if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) 1209e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 12100a4e9518Sgw 121180eb36f2SGeorge Wilson /* 1212ec94d322SAdam Leventhal * If this is a high priority I/O, then use the high priority taskq if 1213ec94d322SAdam Leventhal * available. 121480eb36f2SGeorge Wilson */ 121580eb36f2SGeorge Wilson if (zio->io_priority == ZIO_PRIORITY_NOW && 1216ec94d322SAdam Leventhal spa->spa_zio_taskq[t][q + 1].stqs_count != 0) 121780eb36f2SGeorge Wilson q++; 121880eb36f2SGeorge Wilson 121980eb36f2SGeorge Wilson ASSERT3U(q, <, ZIO_TASKQ_TYPES); 12205aeb9474SGarrett D'Amore 12215aeb9474SGarrett D'Amore /* 12225aeb9474SGarrett D'Amore * NB: We are assuming that the zio can only be dispatched 12235aeb9474SGarrett D'Amore * to a single taskq at a time. It would be a grievous error 12245aeb9474SGarrett D'Amore * to dispatch the zio to another taskq at the same time. 12255aeb9474SGarrett D'Amore */ 12265aeb9474SGarrett D'Amore ASSERT(zio->io_tqent.tqent_next == NULL); 1227ec94d322SAdam Leventhal spa_taskq_dispatch_ent(spa, t, q, (task_func_t *)zio_execute, zio, 1228ec94d322SAdam Leventhal flags, &zio->io_tqent); 1229e14bb325SJeff Bonwick } 12300a4e9518Sgw 1231e14bb325SJeff Bonwick static boolean_t 1232ec94d322SAdam Leventhal zio_taskq_member(zio_t *zio, zio_taskq_type_t q) 1233e14bb325SJeff Bonwick { 1234e14bb325SJeff Bonwick kthread_t *executor = zio->io_executor; 1235e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 12360a4e9518Sgw 1237ec94d322SAdam Leventhal for (zio_type_t t = 0; t < ZIO_TYPES; t++) { 1238ec94d322SAdam Leventhal spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 1239ec94d322SAdam Leventhal uint_t i; 1240ec94d322SAdam Leventhal for (i = 0; i < tqs->stqs_count; i++) { 1241ec94d322SAdam Leventhal if (taskq_member(tqs->stqs_taskq[i], executor)) 1242ec94d322SAdam Leventhal return (B_TRUE); 1243ec94d322SAdam Leventhal } 1244ec94d322SAdam Leventhal } 12450a4e9518Sgw 1246e14bb325SJeff Bonwick return (B_FALSE); 1247e14bb325SJeff Bonwick } 1248e05725b1Sbonwick 1249e14bb325SJeff Bonwick static int 1250e14bb325SJeff Bonwick zio_issue_async(zio_t *zio) 1251e14bb325SJeff Bonwick { 125235a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 1253e14bb325SJeff Bonwick 1254e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 12550a4e9518Sgw } 12560a4e9518Sgw 1257e14bb325SJeff Bonwick void 1258e14bb325SJeff Bonwick zio_interrupt(zio_t *zio) 12590a4e9518Sgw { 126035a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE); 1261e14bb325SJeff Bonwick } 12620a4e9518Sgw 1263e14bb325SJeff Bonwick /* 1264e14bb325SJeff Bonwick * Execute the I/O pipeline until one of the following occurs: 1265f7170741SWill Andrews * 1266f7170741SWill Andrews * (1) the I/O completes 1267f7170741SWill Andrews * (2) the pipeline stalls waiting for dependent child I/Os 1268f7170741SWill Andrews * (3) the I/O issues, so we're waiting for an I/O completion interrupt 1269f7170741SWill Andrews * (4) the I/O is delegated by vdev-level caching or aggregation 1270f7170741SWill Andrews * (5) the I/O is deferred due to vdev-level queueing 1271f7170741SWill Andrews * (6) the I/O is handed off to another thread. 1272f7170741SWill Andrews * 1273f7170741SWill Andrews * In all cases, the pipeline stops whenever there's no CPU work; it never 1274f7170741SWill Andrews * burns a thread in cv_wait(). 1275e14bb325SJeff Bonwick * 1276e14bb325SJeff Bonwick * There's no locking on io_stage because there's no legitimate way 1277e14bb325SJeff Bonwick * for multiple threads to be attempting to process the same I/O. 1278e14bb325SJeff Bonwick */ 1279b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[]; 12800a4e9518Sgw 1281e14bb325SJeff Bonwick void 1282e14bb325SJeff Bonwick zio_execute(zio_t *zio) 1283e14bb325SJeff Bonwick { 1284e14bb325SJeff Bonwick zio->io_executor = curthread; 12850a4e9518Sgw 1286e14bb325SJeff Bonwick while (zio->io_stage < ZIO_STAGE_DONE) { 1287b24ab676SJeff Bonwick enum zio_stage pipeline = zio->io_pipeline; 1288b24ab676SJeff Bonwick enum zio_stage stage = zio->io_stage; 1289e14bb325SJeff Bonwick int rv; 12900a4e9518Sgw 1291e14bb325SJeff Bonwick ASSERT(!MUTEX_HELD(&zio->io_lock)); 1292b24ab676SJeff Bonwick ASSERT(ISP2(stage)); 1293b24ab676SJeff Bonwick ASSERT(zio->io_stall == NULL); 12940a4e9518Sgw 1295b24ab676SJeff Bonwick do { 1296b24ab676SJeff Bonwick stage <<= 1; 1297b24ab676SJeff Bonwick } while ((stage & pipeline) == 0); 1298e14bb325SJeff Bonwick 1299e14bb325SJeff Bonwick ASSERT(stage <= ZIO_STAGE_DONE); 13000a4e9518Sgw 13010a4e9518Sgw /* 1302e14bb325SJeff Bonwick * If we are in interrupt context and this pipeline stage 1303e14bb325SJeff Bonwick * will grab a config lock that is held across I/O, 1304b24ab676SJeff Bonwick * or may wait for an I/O that needs an interrupt thread 1305b24ab676SJeff Bonwick * to complete, issue async to avoid deadlock. 130635a5a358SJonathan Adams * 130735a5a358SJonathan Adams * For VDEV_IO_START, we cut in line so that the io will 130835a5a358SJonathan Adams * be sent to disk promptly. 13090a4e9518Sgw */ 1310b24ab676SJeff Bonwick if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && 1311e14bb325SJeff Bonwick zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { 131235a5a358SJonathan Adams boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ? 131335a5a358SJonathan Adams zio_requeue_io_start_cut_in_line : B_FALSE; 131435a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); 1315e14bb325SJeff Bonwick return; 13160a4e9518Sgw } 13170a4e9518Sgw 1318e14bb325SJeff Bonwick zio->io_stage = stage; 1319bf16b11eSMatthew Ahrens rv = zio_pipeline[highbit64(stage) - 1](zio); 13200a4e9518Sgw 1321e14bb325SJeff Bonwick if (rv == ZIO_PIPELINE_STOP) 1322e14bb325SJeff Bonwick return; 13230a4e9518Sgw 1324e14bb325SJeff Bonwick ASSERT(rv == ZIO_PIPELINE_CONTINUE); 1325e14bb325SJeff Bonwick } 13260a4e9518Sgw } 13270a4e9518Sgw 1328e14bb325SJeff Bonwick /* 1329e14bb325SJeff Bonwick * ========================================================================== 1330e14bb325SJeff Bonwick * Initiate I/O, either sync or async 1331e14bb325SJeff Bonwick * ========================================================================== 1332e14bb325SJeff Bonwick */ 1333e14bb325SJeff Bonwick int 1334e14bb325SJeff Bonwick zio_wait(zio_t *zio) 13350a4e9518Sgw { 1336e14bb325SJeff Bonwick int error; 13370a4e9518Sgw 1338e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 1339e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 13400a4e9518Sgw 1341e14bb325SJeff Bonwick zio->io_waiter = curthread; 1342e05725b1Sbonwick 1343e14bb325SJeff Bonwick zio_execute(zio); 13440a4e9518Sgw 1345e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 1346e14bb325SJeff Bonwick while (zio->io_executor != NULL) 1347e14bb325SJeff Bonwick cv_wait(&zio->io_cv, &zio->io_lock); 1348e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 134932b87932Sek 1350e14bb325SJeff Bonwick error = zio->io_error; 1351e14bb325SJeff Bonwick zio_destroy(zio); 135232b87932Sek 1353e14bb325SJeff Bonwick return (error); 135432b87932Sek } 135532b87932Sek 1356e14bb325SJeff Bonwick void 1357e14bb325SJeff Bonwick zio_nowait(zio_t *zio) 13580a4e9518Sgw { 1359e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 1360fa9e4066Sahrens 1361a3f829aeSBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL && 1362a3f829aeSBill Moore zio_unique_parent(zio) == NULL) { 1363ea8dc4b6Seschrock /* 1364e14bb325SJeff Bonwick * This is a logical async I/O with no parent to wait for it. 136554d692b7SGeorge Wilson * We add it to the spa_async_root_zio "Godfather" I/O which 136654d692b7SGeorge Wilson * will ensure they complete prior to unloading the pool. 1367ea8dc4b6Seschrock */ 1368e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 136954d692b7SGeorge Wilson 137054d692b7SGeorge Wilson zio_add_child(spa->spa_async_zio_root, zio); 1371e14bb325SJeff Bonwick } 1372ea8dc4b6Seschrock 1373e14bb325SJeff Bonwick zio_execute(zio); 1374e14bb325SJeff Bonwick } 1375ea8dc4b6Seschrock 1376e14bb325SJeff Bonwick /* 1377e14bb325SJeff Bonwick * ========================================================================== 1378e14bb325SJeff Bonwick * Reexecute or suspend/resume failed I/O 1379e14bb325SJeff Bonwick * ========================================================================== 1380e14bb325SJeff Bonwick */ 1381fa9e4066Sahrens 1382e14bb325SJeff Bonwick static void 1383e14bb325SJeff Bonwick zio_reexecute(zio_t *pio) 1384e14bb325SJeff Bonwick { 1385a3f829aeSBill Moore zio_t *cio, *cio_next; 1386a3f829aeSBill Moore 1387a3f829aeSBill Moore ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); 1388a3f829aeSBill Moore ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); 1389f5383399SBill Moore ASSERT(pio->io_gang_leader == NULL); 1390f5383399SBill Moore ASSERT(pio->io_gang_tree == NULL); 1391e05725b1Sbonwick 1392e14bb325SJeff Bonwick pio->io_flags = pio->io_orig_flags; 1393e14bb325SJeff Bonwick pio->io_stage = pio->io_orig_stage; 1394e14bb325SJeff Bonwick pio->io_pipeline = pio->io_orig_pipeline; 1395e14bb325SJeff Bonwick pio->io_reexecute = 0; 139680901aeaSGeorge Wilson pio->io_flags |= ZIO_FLAG_REEXECUTED; 1397e14bb325SJeff Bonwick pio->io_error = 0; 1398a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1399a3f829aeSBill Moore pio->io_state[w] = 0; 1400e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 1401e14bb325SJeff Bonwick pio->io_child_error[c] = 0; 14020a4e9518Sgw 1403b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(pio)) 1404b24ab676SJeff Bonwick BP_ZERO(pio->io_bp); 1405d58459f4Sek 1406e14bb325SJeff Bonwick /* 1407e14bb325SJeff Bonwick * As we reexecute pio's children, new children could be created. 1408a3f829aeSBill Moore * New children go to the head of pio's io_child_list, however, 1409e14bb325SJeff Bonwick * so we will (correctly) not reexecute them. The key is that 1410a3f829aeSBill Moore * the remainder of pio's io_child_list, from 'cio_next' onward, 1411a3f829aeSBill Moore * cannot be affected by any side effects of reexecuting 'cio'. 1412e14bb325SJeff Bonwick */ 1413a3f829aeSBill Moore for (cio = zio_walk_children(pio); cio != NULL; cio = cio_next) { 1414a3f829aeSBill Moore cio_next = zio_walk_children(pio); 1415e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 1416a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1417a3f829aeSBill Moore pio->io_children[cio->io_child_type][w]++; 1418e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 1419a3f829aeSBill Moore zio_reexecute(cio); 1420fa9e4066Sahrens } 1421e05725b1Sbonwick 1422e14bb325SJeff Bonwick /* 1423e14bb325SJeff Bonwick * Now that all children have been reexecuted, execute the parent. 142454d692b7SGeorge Wilson * We don't reexecute "The Godfather" I/O here as it's the 142554d692b7SGeorge Wilson * responsibility of the caller to wait on him. 1426e14bb325SJeff Bonwick */ 142754d692b7SGeorge Wilson if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) 142854d692b7SGeorge Wilson zio_execute(pio); 14290a4e9518Sgw } 14300a4e9518Sgw 1431e14bb325SJeff Bonwick void 1432e14bb325SJeff Bonwick zio_suspend(spa_t *spa, zio_t *zio) 14330a4e9518Sgw { 1434e14bb325SJeff Bonwick if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) 1435e14bb325SJeff Bonwick fm_panic("Pool '%s' has encountered an uncorrectable I/O " 1436e14bb325SJeff Bonwick "failure and the failure mode property for this pool " 1437e14bb325SJeff Bonwick "is set to panic.", spa_name(spa)); 14380a4e9518Sgw 1439e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); 14400a4e9518Sgw 1441e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1442fa9e4066Sahrens 1443e14bb325SJeff Bonwick if (spa->spa_suspend_zio_root == NULL) 144454d692b7SGeorge Wilson spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, 144554d692b7SGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 144654d692b7SGeorge Wilson ZIO_FLAG_GODFATHER); 1447fa9e4066Sahrens 1448e14bb325SJeff Bonwick spa->spa_suspended = B_TRUE; 1449fa9e4066Sahrens 1450e14bb325SJeff Bonwick if (zio != NULL) { 145154d692b7SGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 1452e14bb325SJeff Bonwick ASSERT(zio != spa->spa_suspend_zio_root); 1453e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1454a3f829aeSBill Moore ASSERT(zio_unique_parent(zio) == NULL); 1455e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_DONE); 1456e14bb325SJeff Bonwick zio_add_child(spa->spa_suspend_zio_root, zio); 1457e14bb325SJeff Bonwick } 1458fa9e4066Sahrens 1459e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1460e14bb325SJeff Bonwick } 1461fa9e4066Sahrens 146254d692b7SGeorge Wilson int 1463e14bb325SJeff Bonwick zio_resume(spa_t *spa) 1464e14bb325SJeff Bonwick { 146554d692b7SGeorge Wilson zio_t *pio; 1466fa9e4066Sahrens 1467b3995adbSahrens /* 1468e14bb325SJeff Bonwick * Reexecute all previously suspended i/o. 1469b3995adbSahrens */ 1470e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1471e14bb325SJeff Bonwick spa->spa_suspended = B_FALSE; 1472e14bb325SJeff Bonwick cv_broadcast(&spa->spa_suspend_cv); 1473e14bb325SJeff Bonwick pio = spa->spa_suspend_zio_root; 1474e14bb325SJeff Bonwick spa->spa_suspend_zio_root = NULL; 1475e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1476e14bb325SJeff Bonwick 1477e14bb325SJeff Bonwick if (pio == NULL) 147854d692b7SGeorge Wilson return (0); 1479e14bb325SJeff Bonwick 148054d692b7SGeorge Wilson zio_reexecute(pio); 148154d692b7SGeorge Wilson return (zio_wait(pio)); 1482e14bb325SJeff Bonwick } 1483e14bb325SJeff Bonwick 1484e14bb325SJeff Bonwick void 1485e14bb325SJeff Bonwick zio_resume_wait(spa_t *spa) 1486e14bb325SJeff Bonwick { 1487e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1488e14bb325SJeff Bonwick while (spa_suspended(spa)) 1489e14bb325SJeff Bonwick cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); 1490e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1491fa9e4066Sahrens } 1492fa9e4066Sahrens 1493fa9e4066Sahrens /* 1494fa9e4066Sahrens * ========================================================================== 1495e14bb325SJeff Bonwick * Gang blocks. 1496e14bb325SJeff Bonwick * 1497e14bb325SJeff Bonwick * A gang block is a collection of small blocks that looks to the DMU 1498e14bb325SJeff Bonwick * like one large block. When zio_dva_allocate() cannot find a block 1499e14bb325SJeff Bonwick * of the requested size, due to either severe fragmentation or the pool 1500e14bb325SJeff Bonwick * being nearly full, it calls zio_write_gang_block() to construct the 1501e14bb325SJeff Bonwick * block from smaller fragments. 1502e14bb325SJeff Bonwick * 1503e14bb325SJeff Bonwick * A gang block consists of a gang header (zio_gbh_phys_t) and up to 1504e14bb325SJeff Bonwick * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like 1505e14bb325SJeff Bonwick * an indirect block: it's an array of block pointers. It consumes 1506e14bb325SJeff Bonwick * only one sector and hence is allocatable regardless of fragmentation. 1507e14bb325SJeff Bonwick * The gang header's bps point to its gang members, which hold the data. 1508e14bb325SJeff Bonwick * 1509e14bb325SJeff Bonwick * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> 1510e14bb325SJeff Bonwick * as the verifier to ensure uniqueness of the SHA256 checksum. 1511e14bb325SJeff Bonwick * Critically, the gang block bp's blk_cksum is the checksum of the data, 1512e14bb325SJeff Bonwick * not the gang header. This ensures that data block signatures (needed for 1513e14bb325SJeff Bonwick * deduplication) are independent of how the block is physically stored. 1514e14bb325SJeff Bonwick * 1515e14bb325SJeff Bonwick * Gang blocks can be nested: a gang member may itself be a gang block. 1516e14bb325SJeff Bonwick * Thus every gang block is a tree in which root and all interior nodes are 1517e14bb325SJeff Bonwick * gang headers, and the leaves are normal blocks that contain user data. 1518e14bb325SJeff Bonwick * The root of the gang tree is called the gang leader. 1519e14bb325SJeff Bonwick * 1520e14bb325SJeff Bonwick * To perform any operation (read, rewrite, free, claim) on a gang block, 1521e14bb325SJeff Bonwick * zio_gang_assemble() first assembles the gang tree (minus data leaves) 1522e14bb325SJeff Bonwick * in the io_gang_tree field of the original logical i/o by recursively 1523e14bb325SJeff Bonwick * reading the gang leader and all gang headers below it. This yields 1524e14bb325SJeff Bonwick * an in-core tree containing the contents of every gang header and the 1525e14bb325SJeff Bonwick * bps for every constituent of the gang block. 1526e14bb325SJeff Bonwick * 1527e14bb325SJeff Bonwick * With the gang tree now assembled, zio_gang_issue() just walks the gang tree 1528e14bb325SJeff Bonwick * and invokes a callback on each bp. To free a gang block, zio_gang_issue() 1529e14bb325SJeff Bonwick * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. 1530e14bb325SJeff Bonwick * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). 1531e14bb325SJeff Bonwick * zio_read_gang() is a wrapper around zio_read() that omits reading gang 1532e14bb325SJeff Bonwick * headers, since we already have those in io_gang_tree. zio_rewrite_gang() 1533e14bb325SJeff Bonwick * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() 1534e14bb325SJeff Bonwick * of the gang header plus zio_checksum_compute() of the data to update the 1535e14bb325SJeff Bonwick * gang header's blk_cksum as described above. 1536e14bb325SJeff Bonwick * 1537e14bb325SJeff Bonwick * The two-phase assemble/issue model solves the problem of partial failure -- 1538e14bb325SJeff Bonwick * what if you'd freed part of a gang block but then couldn't read the 1539e14bb325SJeff Bonwick * gang header for another part? Assembling the entire gang tree first 1540e14bb325SJeff Bonwick * ensures that all the necessary gang header I/O has succeeded before 1541e14bb325SJeff Bonwick * starting the actual work of free, claim, or write. Once the gang tree 1542e14bb325SJeff Bonwick * is assembled, free and claim are in-memory operations that cannot fail. 1543e14bb325SJeff Bonwick * 1544e14bb325SJeff Bonwick * In the event that a gang write fails, zio_dva_unallocate() walks the 1545e14bb325SJeff Bonwick * gang tree to immediately free (i.e. insert back into the space map) 1546e14bb325SJeff Bonwick * everything we've allocated. This ensures that we don't get ENOSPC 1547e14bb325SJeff Bonwick * errors during repeated suspend/resume cycles due to a flaky device. 1548e14bb325SJeff Bonwick * 1549e14bb325SJeff Bonwick * Gang rewrites only happen during sync-to-convergence. If we can't assemble 1550e14bb325SJeff Bonwick * the gang tree, we won't modify the block, so we can safely defer the free 1551e14bb325SJeff Bonwick * (knowing that the block is still intact). If we *can* assemble the gang 1552e14bb325SJeff Bonwick * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free 1553e14bb325SJeff Bonwick * each constituent bp and we can allocate a new block on the next sync pass. 1554e14bb325SJeff Bonwick * 1555e14bb325SJeff Bonwick * In all cases, the gang tree allows complete recovery from partial failure. 1556fa9e4066Sahrens * ========================================================================== 1557fa9e4066Sahrens */ 1558e14bb325SJeff Bonwick 1559e14bb325SJeff Bonwick static zio_t * 1560e14bb325SJeff Bonwick zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1561fa9e4066Sahrens { 1562e14bb325SJeff Bonwick if (gn != NULL) 1563e14bb325SJeff Bonwick return (pio); 1564fa9e4066Sahrens 1565e14bb325SJeff Bonwick return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), 1566e14bb325SJeff Bonwick NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1567e14bb325SJeff Bonwick &pio->io_bookmark)); 1568e14bb325SJeff Bonwick } 1569e14bb325SJeff Bonwick 1570e14bb325SJeff Bonwick zio_t * 1571e14bb325SJeff Bonwick zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1572e14bb325SJeff Bonwick { 1573e14bb325SJeff Bonwick zio_t *zio; 1574e14bb325SJeff Bonwick 1575e14bb325SJeff Bonwick if (gn != NULL) { 1576e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1577e14bb325SJeff Bonwick gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, 1578e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1579fa9e4066Sahrens /* 1580e14bb325SJeff Bonwick * As we rewrite each gang header, the pipeline will compute 1581e14bb325SJeff Bonwick * a new gang block header checksum for it; but no one will 1582e14bb325SJeff Bonwick * compute a new data checksum, so we do that here. The one 1583e14bb325SJeff Bonwick * exception is the gang leader: the pipeline already computed 1584e14bb325SJeff Bonwick * its data checksum because that stage precedes gang assembly. 1585e14bb325SJeff Bonwick * (Presently, nothing actually uses interior data checksums; 1586e14bb325SJeff Bonwick * this is just good hygiene.) 1587fa9e4066Sahrens */ 1588f5383399SBill Moore if (gn != pio->io_gang_leader->io_gang_tree) { 1589e14bb325SJeff Bonwick zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), 1590e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp)); 1591e14bb325SJeff Bonwick } 1592b24ab676SJeff Bonwick /* 1593b24ab676SJeff Bonwick * If we are here to damage data for testing purposes, 1594b24ab676SJeff Bonwick * leave the GBH alone so that we can detect the damage. 1595b24ab676SJeff Bonwick */ 1596b24ab676SJeff Bonwick if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) 1597b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 1598fa9e4066Sahrens } else { 1599e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1600e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, 1601e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1602fa9e4066Sahrens } 1603fa9e4066Sahrens 1604e14bb325SJeff Bonwick return (zio); 1605e14bb325SJeff Bonwick } 1606fa9e4066Sahrens 1607e14bb325SJeff Bonwick /* ARGSUSED */ 1608e14bb325SJeff Bonwick zio_t * 1609e14bb325SJeff Bonwick zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1610e14bb325SJeff Bonwick { 1611b24ab676SJeff Bonwick return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, 1612b24ab676SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio))); 1613fa9e4066Sahrens } 1614fa9e4066Sahrens 1615e14bb325SJeff Bonwick /* ARGSUSED */ 1616e14bb325SJeff Bonwick zio_t * 1617e14bb325SJeff Bonwick zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1618fa9e4066Sahrens { 1619e14bb325SJeff Bonwick return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, 1620e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 1621e14bb325SJeff Bonwick } 1622fa9e4066Sahrens 1623e14bb325SJeff Bonwick static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { 1624e14bb325SJeff Bonwick NULL, 1625e14bb325SJeff Bonwick zio_read_gang, 1626e14bb325SJeff Bonwick zio_rewrite_gang, 1627e14bb325SJeff Bonwick zio_free_gang, 1628e14bb325SJeff Bonwick zio_claim_gang, 1629e14bb325SJeff Bonwick NULL 1630e14bb325SJeff Bonwick }; 1631fa9e4066Sahrens 1632e14bb325SJeff Bonwick static void zio_gang_tree_assemble_done(zio_t *zio); 1633fa9e4066Sahrens 1634e14bb325SJeff Bonwick static zio_gang_node_t * 1635e14bb325SJeff Bonwick zio_gang_node_alloc(zio_gang_node_t **gnpp) 1636e14bb325SJeff Bonwick { 1637e14bb325SJeff Bonwick zio_gang_node_t *gn; 1638fa9e4066Sahrens 1639e14bb325SJeff Bonwick ASSERT(*gnpp == NULL); 1640fa9e4066Sahrens 1641e14bb325SJeff Bonwick gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); 1642e14bb325SJeff Bonwick gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); 1643e14bb325SJeff Bonwick *gnpp = gn; 1644e14bb325SJeff Bonwick 1645e14bb325SJeff Bonwick return (gn); 1646fa9e4066Sahrens } 1647fa9e4066Sahrens 1648fa9e4066Sahrens static void 1649e14bb325SJeff Bonwick zio_gang_node_free(zio_gang_node_t **gnpp) 1650fa9e4066Sahrens { 1651e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1652fa9e4066Sahrens 1653e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1654e14bb325SJeff Bonwick ASSERT(gn->gn_child[g] == NULL); 1655e14bb325SJeff Bonwick 1656e14bb325SJeff Bonwick zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); 1657e14bb325SJeff Bonwick kmem_free(gn, sizeof (*gn)); 1658e14bb325SJeff Bonwick *gnpp = NULL; 1659fa9e4066Sahrens } 1660fa9e4066Sahrens 1661e14bb325SJeff Bonwick static void 1662e14bb325SJeff Bonwick zio_gang_tree_free(zio_gang_node_t **gnpp) 1663fa9e4066Sahrens { 1664e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1665fa9e4066Sahrens 1666e14bb325SJeff Bonwick if (gn == NULL) 1667e14bb325SJeff Bonwick return; 1668fa9e4066Sahrens 1669e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1670e14bb325SJeff Bonwick zio_gang_tree_free(&gn->gn_child[g]); 1671fa9e4066Sahrens 1672e14bb325SJeff Bonwick zio_gang_node_free(gnpp); 1673fa9e4066Sahrens } 1674fa9e4066Sahrens 1675e14bb325SJeff Bonwick static void 1676f5383399SBill Moore zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) 1677fa9e4066Sahrens { 1678e14bb325SJeff Bonwick zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); 1679e14bb325SJeff Bonwick 1680f5383399SBill Moore ASSERT(gio->io_gang_leader == gio); 1681e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp)); 1682fa9e4066Sahrens 1683f5383399SBill Moore zio_nowait(zio_read(gio, gio->io_spa, bp, gn->gn_gbh, 1684e14bb325SJeff Bonwick SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, 1685f5383399SBill Moore gio->io_priority, ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); 1686e14bb325SJeff Bonwick } 1687fa9e4066Sahrens 1688e14bb325SJeff Bonwick static void 1689e14bb325SJeff Bonwick zio_gang_tree_assemble_done(zio_t *zio) 1690e14bb325SJeff Bonwick { 1691f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 1692e14bb325SJeff Bonwick zio_gang_node_t *gn = zio->io_private; 1693e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1694fa9e4066Sahrens 1695f5383399SBill Moore ASSERT(gio == zio_unique_parent(zio)); 1696b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 1697fa9e4066Sahrens 1698e14bb325SJeff Bonwick if (zio->io_error) 1699e14bb325SJeff Bonwick return; 1700fa9e4066Sahrens 1701e14bb325SJeff Bonwick if (BP_SHOULD_BYTESWAP(bp)) 1702e14bb325SJeff Bonwick byteswap_uint64_array(zio->io_data, zio->io_size); 1703fa9e4066Sahrens 1704e14bb325SJeff Bonwick ASSERT(zio->io_data == gn->gn_gbh); 1705e14bb325SJeff Bonwick ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); 17066e1f5caaSNeil Perrin ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); 1707e05725b1Sbonwick 1708e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1709e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1710e14bb325SJeff Bonwick if (!BP_IS_GANG(gbp)) 1711e14bb325SJeff Bonwick continue; 1712f5383399SBill Moore zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); 1713e14bb325SJeff Bonwick } 1714fa9e4066Sahrens } 1715fa9e4066Sahrens 1716e14bb325SJeff Bonwick static void 1717e14bb325SJeff Bonwick zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) 1718fa9e4066Sahrens { 1719f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1720e14bb325SJeff Bonwick zio_t *zio; 1721fa9e4066Sahrens 1722e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) == !!gn); 1723f5383399SBill Moore ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); 1724f5383399SBill Moore ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); 1725fa9e4066Sahrens 1726e14bb325SJeff Bonwick /* 1727e14bb325SJeff Bonwick * If you're a gang header, your data is in gn->gn_gbh. 1728e14bb325SJeff Bonwick * If you're a gang member, your data is in 'data' and gn == NULL. 1729e14bb325SJeff Bonwick */ 1730f5383399SBill Moore zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data); 1731fa9e4066Sahrens 1732e14bb325SJeff Bonwick if (gn != NULL) { 17336e1f5caaSNeil Perrin ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); 1734fa9e4066Sahrens 1735e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1736e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1737e14bb325SJeff Bonwick if (BP_IS_HOLE(gbp)) 1738e14bb325SJeff Bonwick continue; 1739e14bb325SJeff Bonwick zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); 1740e14bb325SJeff Bonwick data = (char *)data + BP_GET_PSIZE(gbp); 1741e14bb325SJeff Bonwick } 1742fa9e4066Sahrens } 1743fa9e4066Sahrens 1744f5383399SBill Moore if (gn == gio->io_gang_tree) 1745f5383399SBill Moore ASSERT3P((char *)gio->io_data + gio->io_size, ==, data); 1746e05725b1Sbonwick 1747e14bb325SJeff Bonwick if (zio != pio) 1748e14bb325SJeff Bonwick zio_nowait(zio); 1749fa9e4066Sahrens } 1750fa9e4066Sahrens 1751e05725b1Sbonwick static int 1752e14bb325SJeff Bonwick zio_gang_assemble(zio_t *zio) 1753fa9e4066Sahrens { 1754e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1755fa9e4066Sahrens 1756f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); 1757f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1758f5383399SBill Moore 1759f5383399SBill Moore zio->io_gang_leader = zio; 1760fa9e4066Sahrens 1761e14bb325SJeff Bonwick zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); 1762e05725b1Sbonwick 1763e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1764fa9e4066Sahrens } 1765fa9e4066Sahrens 1766e05725b1Sbonwick static int 1767e14bb325SJeff Bonwick zio_gang_issue(zio_t *zio) 1768fa9e4066Sahrens { 1769e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1770fa9e4066Sahrens 1771e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) 1772e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1773fa9e4066Sahrens 1774f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); 1775f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1776fa9e4066Sahrens 1777e14bb325SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_GANG] == 0) 1778f5383399SBill Moore zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_data); 1779e14bb325SJeff Bonwick else 1780f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 1781fa9e4066Sahrens 1782e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1783e05725b1Sbonwick 1784e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1785fa9e4066Sahrens } 1786fa9e4066Sahrens 1787fa9e4066Sahrens static void 1788e14bb325SJeff Bonwick zio_write_gang_member_ready(zio_t *zio) 1789fa9e4066Sahrens { 1790a3f829aeSBill Moore zio_t *pio = zio_unique_parent(zio); 1791f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 179244cd46caSbillm dva_t *cdva = zio->io_bp->blk_dva; 179344cd46caSbillm dva_t *pdva = pio->io_bp->blk_dva; 1794fa9e4066Sahrens uint64_t asize; 1795fa9e4066Sahrens 1796e14bb325SJeff Bonwick if (BP_IS_HOLE(zio->io_bp)) 1797e14bb325SJeff Bonwick return; 1798e14bb325SJeff Bonwick 1799e14bb325SJeff Bonwick ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); 1800e14bb325SJeff Bonwick 1801e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_GANG); 1802b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); 1803b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); 1804b24ab676SJeff Bonwick ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); 180544cd46caSbillm ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); 1806fa9e4066Sahrens 1807fa9e4066Sahrens mutex_enter(&pio->io_lock); 1808e14bb325SJeff Bonwick for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { 180944cd46caSbillm ASSERT(DVA_GET_GANG(&pdva[d])); 181044cd46caSbillm asize = DVA_GET_ASIZE(&pdva[d]); 181144cd46caSbillm asize += DVA_GET_ASIZE(&cdva[d]); 181244cd46caSbillm DVA_SET_ASIZE(&pdva[d], asize); 181344cd46caSbillm } 1814fa9e4066Sahrens mutex_exit(&pio->io_lock); 1815fa9e4066Sahrens } 1816fa9e4066Sahrens 18170a4e9518Sgw static int 1818e14bb325SJeff Bonwick zio_write_gang_block(zio_t *pio) 1819fa9e4066Sahrens { 1820e14bb325SJeff Bonwick spa_t *spa = pio->io_spa; 1821e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 1822f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1823e14bb325SJeff Bonwick zio_t *zio; 1824e14bb325SJeff Bonwick zio_gang_node_t *gn, **gnpp; 1825fa9e4066Sahrens zio_gbh_phys_t *gbh; 1826e14bb325SJeff Bonwick uint64_t txg = pio->io_txg; 1827e14bb325SJeff Bonwick uint64_t resid = pio->io_size; 1828e14bb325SJeff Bonwick uint64_t lsize; 1829b24ab676SJeff Bonwick int copies = gio->io_prop.zp_copies; 1830b24ab676SJeff Bonwick int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); 1831e14bb325SJeff Bonwick zio_prop_t zp; 1832fa9e4066Sahrens int error; 1833fa9e4066Sahrens 1834b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), SPA_GANGBLOCKSIZE, 1835b24ab676SJeff Bonwick bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, 1836e14bb325SJeff Bonwick METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); 1837e05725b1Sbonwick if (error) { 1838e14bb325SJeff Bonwick pio->io_error = error; 1839e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1840e05725b1Sbonwick } 1841fa9e4066Sahrens 1842f5383399SBill Moore if (pio == gio) { 1843f5383399SBill Moore gnpp = &gio->io_gang_tree; 1844e14bb325SJeff Bonwick } else { 1845e14bb325SJeff Bonwick gnpp = pio->io_private; 1846e14bb325SJeff Bonwick ASSERT(pio->io_ready == zio_write_gang_member_ready); 1847fa9e4066Sahrens } 1848fa9e4066Sahrens 1849e14bb325SJeff Bonwick gn = zio_gang_node_alloc(gnpp); 1850e14bb325SJeff Bonwick gbh = gn->gn_gbh; 1851e14bb325SJeff Bonwick bzero(gbh, SPA_GANGBLOCKSIZE); 1852fa9e4066Sahrens 1853e14bb325SJeff Bonwick /* 1854e14bb325SJeff Bonwick * Create the gang header. 1855e14bb325SJeff Bonwick */ 1856e14bb325SJeff Bonwick zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, 1857e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1858fa9e4066Sahrens 1859e14bb325SJeff Bonwick /* 1860e14bb325SJeff Bonwick * Create and nowait the gang children. 1861e14bb325SJeff Bonwick */ 1862e14bb325SJeff Bonwick for (int g = 0; resid != 0; resid -= lsize, g++) { 1863e14bb325SJeff Bonwick lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), 1864e14bb325SJeff Bonwick SPA_MINBLOCKSIZE); 1865e14bb325SJeff Bonwick ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); 1866e14bb325SJeff Bonwick 1867f5383399SBill Moore zp.zp_checksum = gio->io_prop.zp_checksum; 1868e14bb325SJeff Bonwick zp.zp_compress = ZIO_COMPRESS_OFF; 1869e14bb325SJeff Bonwick zp.zp_type = DMU_OT_NONE; 1870e14bb325SJeff Bonwick zp.zp_level = 0; 1871b24ab676SJeff Bonwick zp.zp_copies = gio->io_prop.zp_copies; 187280901aeaSGeorge Wilson zp.zp_dedup = B_FALSE; 187380901aeaSGeorge Wilson zp.zp_dedup_verify = B_FALSE; 187480901aeaSGeorge Wilson zp.zp_nopwrite = B_FALSE; 1875e14bb325SJeff Bonwick 1876e14bb325SJeff Bonwick zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], 1877e14bb325SJeff Bonwick (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, 187869962b56SMatthew Ahrens zio_write_gang_member_ready, NULL, NULL, &gn->gn_child[g], 1879e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1880e14bb325SJeff Bonwick &pio->io_bookmark)); 1881e14bb325SJeff Bonwick } 1882e05725b1Sbonwick 188344cd46caSbillm /* 1884e14bb325SJeff Bonwick * Set pio's pipeline to just wait for zio to finish. 188544cd46caSbillm */ 1886e14bb325SJeff Bonwick pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1887e14bb325SJeff Bonwick 1888e14bb325SJeff Bonwick zio_nowait(zio); 1889e14bb325SJeff Bonwick 1890e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1891fa9e4066Sahrens } 1892fa9e4066Sahrens 189380901aeaSGeorge Wilson /* 189480901aeaSGeorge Wilson * The zio_nop_write stage in the pipeline determines if allocating 189580901aeaSGeorge Wilson * a new bp is necessary. By leveraging a cryptographically secure checksum, 189680901aeaSGeorge Wilson * such as SHA256, we can compare the checksums of the new data and the old 189780901aeaSGeorge Wilson * to determine if allocating a new block is required. The nopwrite 189880901aeaSGeorge Wilson * feature can handle writes in either syncing or open context (i.e. zil 189980901aeaSGeorge Wilson * writes) and as a result is mutually exclusive with dedup. 190080901aeaSGeorge Wilson */ 190180901aeaSGeorge Wilson static int 190280901aeaSGeorge Wilson zio_nop_write(zio_t *zio) 190380901aeaSGeorge Wilson { 190480901aeaSGeorge Wilson blkptr_t *bp = zio->io_bp; 190580901aeaSGeorge Wilson blkptr_t *bp_orig = &zio->io_bp_orig; 190680901aeaSGeorge Wilson zio_prop_t *zp = &zio->io_prop; 190780901aeaSGeorge Wilson 190880901aeaSGeorge Wilson ASSERT(BP_GET_LEVEL(bp) == 0); 190980901aeaSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 191080901aeaSGeorge Wilson ASSERT(zp->zp_nopwrite); 191180901aeaSGeorge Wilson ASSERT(!zp->zp_dedup); 191280901aeaSGeorge Wilson ASSERT(zio->io_bp_override == NULL); 191380901aeaSGeorge Wilson ASSERT(IO_IS_ALLOCATING(zio)); 191480901aeaSGeorge Wilson 191580901aeaSGeorge Wilson /* 191680901aeaSGeorge Wilson * Check to see if the original bp and the new bp have matching 191780901aeaSGeorge Wilson * characteristics (i.e. same checksum, compression algorithms, etc). 191880901aeaSGeorge Wilson * If they don't then just continue with the pipeline which will 191980901aeaSGeorge Wilson * allocate a new bp. 192080901aeaSGeorge Wilson */ 192180901aeaSGeorge Wilson if (BP_IS_HOLE(bp_orig) || 192280901aeaSGeorge Wilson !zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_dedup || 192380901aeaSGeorge Wilson BP_GET_CHECKSUM(bp) != BP_GET_CHECKSUM(bp_orig) || 192480901aeaSGeorge Wilson BP_GET_COMPRESS(bp) != BP_GET_COMPRESS(bp_orig) || 192580901aeaSGeorge Wilson BP_GET_DEDUP(bp) != BP_GET_DEDUP(bp_orig) || 192680901aeaSGeorge Wilson zp->zp_copies != BP_GET_NDVAS(bp_orig)) 192780901aeaSGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 192880901aeaSGeorge Wilson 192980901aeaSGeorge Wilson /* 193080901aeaSGeorge Wilson * If the checksums match then reset the pipeline so that we 193180901aeaSGeorge Wilson * avoid allocating a new bp and issuing any I/O. 193280901aeaSGeorge Wilson */ 193380901aeaSGeorge Wilson if (ZIO_CHECKSUM_EQUAL(bp->blk_cksum, bp_orig->blk_cksum)) { 193480901aeaSGeorge Wilson ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup); 193580901aeaSGeorge Wilson ASSERT3U(BP_GET_PSIZE(bp), ==, BP_GET_PSIZE(bp_orig)); 193680901aeaSGeorge Wilson ASSERT3U(BP_GET_LSIZE(bp), ==, BP_GET_LSIZE(bp_orig)); 193780901aeaSGeorge Wilson ASSERT(zp->zp_compress != ZIO_COMPRESS_OFF); 193880901aeaSGeorge Wilson ASSERT(bcmp(&bp->blk_prop, &bp_orig->blk_prop, 193980901aeaSGeorge Wilson sizeof (uint64_t)) == 0); 194080901aeaSGeorge Wilson 194180901aeaSGeorge Wilson *bp = *bp_orig; 194280901aeaSGeorge Wilson zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 194380901aeaSGeorge Wilson zio->io_flags |= ZIO_FLAG_NOPWRITE; 194480901aeaSGeorge Wilson } 194580901aeaSGeorge Wilson 194680901aeaSGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 194780901aeaSGeorge Wilson } 194880901aeaSGeorge Wilson 1949fa9e4066Sahrens /* 1950fa9e4066Sahrens * ========================================================================== 1951b24ab676SJeff Bonwick * Dedup 1952fa9e4066Sahrens * ========================================================================== 1953fa9e4066Sahrens */ 1954b24ab676SJeff Bonwick static void 1955b24ab676SJeff Bonwick zio_ddt_child_read_done(zio_t *zio) 1956b24ab676SJeff Bonwick { 1957b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1958b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1959b24ab676SJeff Bonwick ddt_phys_t *ddp; 1960b24ab676SJeff Bonwick zio_t *pio = zio_unique_parent(zio); 1961b24ab676SJeff Bonwick 1962b24ab676SJeff Bonwick mutex_enter(&pio->io_lock); 1963b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 1964b24ab676SJeff Bonwick if (zio->io_error == 0) 1965b24ab676SJeff Bonwick ddt_phys_clear(ddp); /* this ddp doesn't need repair */ 1966b24ab676SJeff Bonwick if (zio->io_error == 0 && dde->dde_repair_data == NULL) 1967b24ab676SJeff Bonwick dde->dde_repair_data = zio->io_data; 1968b24ab676SJeff Bonwick else 1969b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zio->io_size); 1970b24ab676SJeff Bonwick mutex_exit(&pio->io_lock); 1971b24ab676SJeff Bonwick } 1972b24ab676SJeff Bonwick 1973b24ab676SJeff Bonwick static int 1974b24ab676SJeff Bonwick zio_ddt_read_start(zio_t *zio) 1975b24ab676SJeff Bonwick { 1976b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1977b24ab676SJeff Bonwick 1978b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1979b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1980b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1981b24ab676SJeff Bonwick 1982b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1983b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1984b24ab676SJeff Bonwick ddt_entry_t *dde = ddt_repair_start(ddt, bp); 1985b24ab676SJeff Bonwick ddt_phys_t *ddp = dde->dde_phys; 1986b24ab676SJeff Bonwick ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); 1987b24ab676SJeff Bonwick blkptr_t blk; 1988b24ab676SJeff Bonwick 1989b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1990b24ab676SJeff Bonwick zio->io_vsd = dde; 1991b24ab676SJeff Bonwick 1992b24ab676SJeff Bonwick if (ddp_self == NULL) 1993b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1994b24ab676SJeff Bonwick 1995b24ab676SJeff Bonwick for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { 1996b24ab676SJeff Bonwick if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) 1997b24ab676SJeff Bonwick continue; 1998bbfd46c4SJeff Bonwick ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, 1999bbfd46c4SJeff Bonwick &blk); 2000b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, &blk, 2001b24ab676SJeff Bonwick zio_buf_alloc(zio->io_size), zio->io_size, 2002b24ab676SJeff Bonwick zio_ddt_child_read_done, dde, zio->io_priority, 2003b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio) | ZIO_FLAG_DONT_PROPAGATE, 2004b24ab676SJeff Bonwick &zio->io_bookmark)); 2005b24ab676SJeff Bonwick } 2006b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2007b24ab676SJeff Bonwick } 2008b24ab676SJeff Bonwick 2009b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, bp, 2010b24ab676SJeff Bonwick zio->io_data, zio->io_size, NULL, NULL, zio->io_priority, 2011b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); 2012b24ab676SJeff Bonwick 2013b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2014b24ab676SJeff Bonwick } 2015e14bb325SJeff Bonwick 2016b24ab676SJeff Bonwick static int 2017b24ab676SJeff Bonwick zio_ddt_read_done(zio_t *zio) 2018b24ab676SJeff Bonwick { 2019b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2020b24ab676SJeff Bonwick 2021b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE)) 2022b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 2023b24ab676SJeff Bonwick 2024b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2025b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 2026b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2027b24ab676SJeff Bonwick 2028b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 2029b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 2030b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_vsd; 2031b24ab676SJeff Bonwick if (ddt == NULL) { 2032b16da2e2SGeorge Wilson ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE); 2033b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2034b24ab676SJeff Bonwick } 2035b24ab676SJeff Bonwick if (dde == NULL) { 2036b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; 203735a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 2038b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 2039b24ab676SJeff Bonwick } 2040b24ab676SJeff Bonwick if (dde->dde_repair_data != NULL) { 2041b24ab676SJeff Bonwick bcopy(dde->dde_repair_data, zio->io_data, zio->io_size); 2042b24ab676SJeff Bonwick zio->io_child_error[ZIO_CHILD_DDT] = 0; 2043b24ab676SJeff Bonwick } 2044b24ab676SJeff Bonwick ddt_repair_done(ddt, dde); 2045b24ab676SJeff Bonwick zio->io_vsd = NULL; 2046b24ab676SJeff Bonwick } 2047b24ab676SJeff Bonwick 2048b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 2049b24ab676SJeff Bonwick 2050b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2051b24ab676SJeff Bonwick } 2052b24ab676SJeff Bonwick 2053b24ab676SJeff Bonwick static boolean_t 2054b24ab676SJeff Bonwick zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) 2055b24ab676SJeff Bonwick { 2056b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2057b24ab676SJeff Bonwick 2058b24ab676SJeff Bonwick /* 2059b24ab676SJeff Bonwick * Note: we compare the original data, not the transformed data, 2060b24ab676SJeff Bonwick * because when zio->io_bp is an override bp, we will not have 2061b24ab676SJeff Bonwick * pushed the I/O transforms. That's an important optimization 2062b24ab676SJeff Bonwick * because otherwise we'd compress/encrypt all dmu_sync() data twice. 2063b24ab676SJeff Bonwick */ 2064b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 2065b24ab676SJeff Bonwick zio_t *lio = dde->dde_lead_zio[p]; 2066b24ab676SJeff Bonwick 2067b24ab676SJeff Bonwick if (lio != NULL) { 2068b24ab676SJeff Bonwick return (lio->io_orig_size != zio->io_orig_size || 2069b24ab676SJeff Bonwick bcmp(zio->io_orig_data, lio->io_orig_data, 2070b24ab676SJeff Bonwick zio->io_orig_size) != 0); 2071b24ab676SJeff Bonwick } 2072b24ab676SJeff Bonwick } 2073b24ab676SJeff Bonwick 2074b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 2075b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2076b24ab676SJeff Bonwick 2077b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) { 2078b24ab676SJeff Bonwick arc_buf_t *abuf = NULL; 2079b24ab676SJeff Bonwick uint32_t aflags = ARC_WAIT; 2080b24ab676SJeff Bonwick blkptr_t blk = *zio->io_bp; 2081b24ab676SJeff Bonwick int error; 2082b24ab676SJeff Bonwick 2083b24ab676SJeff Bonwick ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); 2084b24ab676SJeff Bonwick 2085b24ab676SJeff Bonwick ddt_exit(ddt); 2086b24ab676SJeff Bonwick 20871b912ec7SGeorge Wilson error = arc_read(NULL, spa, &blk, 2088b24ab676SJeff Bonwick arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, 2089b24ab676SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2090b24ab676SJeff Bonwick &aflags, &zio->io_bookmark); 2091b24ab676SJeff Bonwick 2092b24ab676SJeff Bonwick if (error == 0) { 2093b24ab676SJeff Bonwick if (arc_buf_size(abuf) != zio->io_orig_size || 2094b24ab676SJeff Bonwick bcmp(abuf->b_data, zio->io_orig_data, 2095b24ab676SJeff Bonwick zio->io_orig_size) != 0) 2096be6fd75aSMatthew Ahrens error = SET_ERROR(EEXIST); 20973b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(abuf, &abuf)); 2098b24ab676SJeff Bonwick } 2099b24ab676SJeff Bonwick 2100b24ab676SJeff Bonwick ddt_enter(ddt); 2101b24ab676SJeff Bonwick return (error != 0); 2102b24ab676SJeff Bonwick } 2103b24ab676SJeff Bonwick } 2104b24ab676SJeff Bonwick 2105b24ab676SJeff Bonwick return (B_FALSE); 2106b24ab676SJeff Bonwick } 2107b24ab676SJeff Bonwick 2108b24ab676SJeff Bonwick static void 2109b24ab676SJeff Bonwick zio_ddt_child_write_ready(zio_t *zio) 2110b24ab676SJeff Bonwick { 2111b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 2112b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 2113b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2114b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2115b24ab676SJeff Bonwick zio_t *pio; 2116b24ab676SJeff Bonwick 2117b24ab676SJeff Bonwick if (zio->io_error) 2118b24ab676SJeff Bonwick return; 2119b24ab676SJeff Bonwick 2120b24ab676SJeff Bonwick ddt_enter(ddt); 2121b24ab676SJeff Bonwick 2122b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2123b24ab676SJeff Bonwick 2124b24ab676SJeff Bonwick ddt_phys_fill(ddp, zio->io_bp); 2125b24ab676SJeff Bonwick 2126b24ab676SJeff Bonwick while ((pio = zio_walk_parents(zio)) != NULL) 2127b24ab676SJeff Bonwick ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); 2128b24ab676SJeff Bonwick 2129b24ab676SJeff Bonwick ddt_exit(ddt); 2130b24ab676SJeff Bonwick } 2131b24ab676SJeff Bonwick 2132b24ab676SJeff Bonwick static void 2133b24ab676SJeff Bonwick zio_ddt_child_write_done(zio_t *zio) 2134b24ab676SJeff Bonwick { 2135b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 2136b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 2137b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2138b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2139b24ab676SJeff Bonwick 2140b24ab676SJeff Bonwick ddt_enter(ddt); 2141b24ab676SJeff Bonwick 2142b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 2143b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2144b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 2145b24ab676SJeff Bonwick 2146b24ab676SJeff Bonwick if (zio->io_error == 0) { 2147b24ab676SJeff Bonwick while (zio_walk_parents(zio) != NULL) 2148b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2149b24ab676SJeff Bonwick } else { 2150b24ab676SJeff Bonwick ddt_phys_clear(ddp); 2151b24ab676SJeff Bonwick } 2152b24ab676SJeff Bonwick 2153b24ab676SJeff Bonwick ddt_exit(ddt); 2154b24ab676SJeff Bonwick } 2155b24ab676SJeff Bonwick 2156b24ab676SJeff Bonwick static void 2157b24ab676SJeff Bonwick zio_ddt_ditto_write_done(zio_t *zio) 2158b24ab676SJeff Bonwick { 2159b24ab676SJeff Bonwick int p = DDT_PHYS_DITTO; 2160b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 2161b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2162b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 2163b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2164b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2165b24ab676SJeff Bonwick ddt_key_t *ddk = &dde->dde_key; 2166b24ab676SJeff Bonwick 2167b24ab676SJeff Bonwick ddt_enter(ddt); 2168b24ab676SJeff Bonwick 2169b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 2170b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2171b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 2172b24ab676SJeff Bonwick 2173b24ab676SJeff Bonwick if (zio->io_error == 0) { 2174b24ab676SJeff Bonwick ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); 2175b24ab676SJeff Bonwick ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); 2176b24ab676SJeff Bonwick ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); 2177b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2178b24ab676SJeff Bonwick ddt_phys_free(ddt, ddk, ddp, zio->io_txg); 2179b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2180b24ab676SJeff Bonwick } 2181b24ab676SJeff Bonwick 2182b24ab676SJeff Bonwick ddt_exit(ddt); 2183b24ab676SJeff Bonwick } 2184b24ab676SJeff Bonwick 2185b24ab676SJeff Bonwick static int 2186b24ab676SJeff Bonwick zio_ddt_write(zio_t *zio) 2187b24ab676SJeff Bonwick { 2188b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2189b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2190b24ab676SJeff Bonwick uint64_t txg = zio->io_txg; 2191b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 2192b24ab676SJeff Bonwick int p = zp->zp_copies; 2193b24ab676SJeff Bonwick int ditto_copies; 2194b24ab676SJeff Bonwick zio_t *cio = NULL; 2195b24ab676SJeff Bonwick zio_t *dio = NULL; 2196b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2197b24ab676SJeff Bonwick ddt_entry_t *dde; 2198b24ab676SJeff Bonwick ddt_phys_t *ddp; 2199b24ab676SJeff Bonwick 2200b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2201b24ab676SJeff Bonwick ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); 2202b24ab676SJeff Bonwick ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); 2203b24ab676SJeff Bonwick 2204b24ab676SJeff Bonwick ddt_enter(ddt); 2205b24ab676SJeff Bonwick dde = ddt_lookup(ddt, bp, B_TRUE); 2206b24ab676SJeff Bonwick ddp = &dde->dde_phys[p]; 2207b24ab676SJeff Bonwick 2208b24ab676SJeff Bonwick if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { 2209b24ab676SJeff Bonwick /* 2210b24ab676SJeff Bonwick * If we're using a weak checksum, upgrade to a strong checksum 2211b24ab676SJeff Bonwick * and try again. If we're already using a strong checksum, 2212b24ab676SJeff Bonwick * we can't resolve it, so just convert to an ordinary write. 2213b24ab676SJeff Bonwick * (And automatically e-mail a paper to Nature?) 2214b24ab676SJeff Bonwick */ 2215b24ab676SJeff Bonwick if (!zio_checksum_table[zp->zp_checksum].ci_dedup) { 2216b24ab676SJeff Bonwick zp->zp_checksum = spa_dedup_checksum(spa); 2217b24ab676SJeff Bonwick zio_pop_transforms(zio); 2218b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2219b24ab676SJeff Bonwick BP_ZERO(bp); 2220b24ab676SJeff Bonwick } else { 222180901aeaSGeorge Wilson zp->zp_dedup = B_FALSE; 2222b24ab676SJeff Bonwick } 2223b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2224b24ab676SJeff Bonwick ddt_exit(ddt); 2225b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2226b24ab676SJeff Bonwick } 2227b24ab676SJeff Bonwick 2228b24ab676SJeff Bonwick ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); 2229b24ab676SJeff Bonwick ASSERT(ditto_copies < SPA_DVAS_PER_BP); 2230b24ab676SJeff Bonwick 2231b24ab676SJeff Bonwick if (ditto_copies > ddt_ditto_copies_present(dde) && 2232b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { 2233b24ab676SJeff Bonwick zio_prop_t czp = *zp; 2234b24ab676SJeff Bonwick 2235b24ab676SJeff Bonwick czp.zp_copies = ditto_copies; 2236b24ab676SJeff Bonwick 2237b24ab676SJeff Bonwick /* 2238b24ab676SJeff Bonwick * If we arrived here with an override bp, we won't have run 2239b24ab676SJeff Bonwick * the transform stack, so we won't have the data we need to 2240b24ab676SJeff Bonwick * generate a child i/o. So, toss the override bp and restart. 2241b24ab676SJeff Bonwick * This is safe, because using the override bp is just an 2242b24ab676SJeff Bonwick * optimization; and it's rare, so the cost doesn't matter. 2243b24ab676SJeff Bonwick */ 2244b24ab676SJeff Bonwick if (zio->io_bp_override) { 2245b24ab676SJeff Bonwick zio_pop_transforms(zio); 2246b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2247b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2248b24ab676SJeff Bonwick zio->io_bp_override = NULL; 2249b24ab676SJeff Bonwick BP_ZERO(bp); 2250b24ab676SJeff Bonwick ddt_exit(ddt); 2251b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2252b24ab676SJeff Bonwick } 2253b24ab676SJeff Bonwick 2254b24ab676SJeff Bonwick dio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 225569962b56SMatthew Ahrens zio->io_orig_size, &czp, NULL, NULL, 2256b24ab676SJeff Bonwick zio_ddt_ditto_write_done, dde, zio->io_priority, 2257b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2258b24ab676SJeff Bonwick 2259b24ab676SJeff Bonwick zio_push_transform(dio, zio->io_data, zio->io_size, 0, NULL); 2260b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; 2261b24ab676SJeff Bonwick } 2262b24ab676SJeff Bonwick 2263b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { 2264b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2265b24ab676SJeff Bonwick ddt_bp_fill(ddp, bp, txg); 2266b24ab676SJeff Bonwick if (dde->dde_lead_zio[p] != NULL) 2267b24ab676SJeff Bonwick zio_add_child(zio, dde->dde_lead_zio[p]); 2268b24ab676SJeff Bonwick else 2269b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2270b24ab676SJeff Bonwick } else if (zio->io_bp_override) { 2271b24ab676SJeff Bonwick ASSERT(bp->blk_birth == txg); 2272b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, zio->io_bp_override)); 2273b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2274b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2275b24ab676SJeff Bonwick } else { 2276b24ab676SJeff Bonwick cio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 227769962b56SMatthew Ahrens zio->io_orig_size, zp, zio_ddt_child_write_ready, NULL, 2278b24ab676SJeff Bonwick zio_ddt_child_write_done, dde, zio->io_priority, 2279b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2280b24ab676SJeff Bonwick 2281b24ab676SJeff Bonwick zio_push_transform(cio, zio->io_data, zio->io_size, 0, NULL); 2282b24ab676SJeff Bonwick dde->dde_lead_zio[p] = cio; 2283b24ab676SJeff Bonwick } 2284b24ab676SJeff Bonwick 2285b24ab676SJeff Bonwick ddt_exit(ddt); 2286b24ab676SJeff Bonwick 2287b24ab676SJeff Bonwick if (cio) 2288b24ab676SJeff Bonwick zio_nowait(cio); 2289b24ab676SJeff Bonwick if (dio) 2290b24ab676SJeff Bonwick zio_nowait(dio); 2291b24ab676SJeff Bonwick 2292b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2293b24ab676SJeff Bonwick } 2294b24ab676SJeff Bonwick 22953f9d6ad7SLin Ling ddt_entry_t *freedde; /* for debugging */ 22963f9d6ad7SLin Ling 2297b24ab676SJeff Bonwick static int 2298b24ab676SJeff Bonwick zio_ddt_free(zio_t *zio) 2299b24ab676SJeff Bonwick { 2300b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2301b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2302b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2303b24ab676SJeff Bonwick ddt_entry_t *dde; 2304b24ab676SJeff Bonwick ddt_phys_t *ddp; 2305b24ab676SJeff Bonwick 2306b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2307b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2308b24ab676SJeff Bonwick 2309b24ab676SJeff Bonwick ddt_enter(ddt); 23103f9d6ad7SLin Ling freedde = dde = ddt_lookup(ddt, bp, B_TRUE); 2311b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 2312b24ab676SJeff Bonwick ddt_phys_decref(ddp); 2313b24ab676SJeff Bonwick ddt_exit(ddt); 2314b24ab676SJeff Bonwick 2315b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2316b24ab676SJeff Bonwick } 2317b24ab676SJeff Bonwick 2318b24ab676SJeff Bonwick /* 2319b24ab676SJeff Bonwick * ========================================================================== 2320b24ab676SJeff Bonwick * Allocate and free blocks 2321b24ab676SJeff Bonwick * ========================================================================== 2322b24ab676SJeff Bonwick */ 2323e05725b1Sbonwick static int 2324fa9e4066Sahrens zio_dva_allocate(zio_t *zio) 2325fa9e4066Sahrens { 23268654d025Sperrin spa_t *spa = zio->io_spa; 2327b24ab676SJeff Bonwick metaslab_class_t *mc = spa_normal_class(spa); 2328fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2329fa9e4066Sahrens int error; 233009c9d376SGeorge Wilson int flags = 0; 2331fa9e4066Sahrens 2332f5383399SBill Moore if (zio->io_gang_leader == NULL) { 2333f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 2334f5383399SBill Moore zio->io_gang_leader = zio; 2335f5383399SBill Moore } 2336f5383399SBill Moore 2337fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 2338fb09f5aaSMadhav Suresh ASSERT0(BP_GET_NDVAS(bp)); 2339b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, >, 0); 2340b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); 2341fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 2342fa9e4066Sahrens 234309c9d376SGeorge Wilson /* 234409c9d376SGeorge Wilson * The dump device does not support gang blocks so allocation on 234509c9d376SGeorge Wilson * behalf of the dump device (i.e. ZIO_FLAG_NODATA) must avoid 234609c9d376SGeorge Wilson * the "fast" gang feature. 234709c9d376SGeorge Wilson */ 234809c9d376SGeorge Wilson flags |= (zio->io_flags & ZIO_FLAG_NODATA) ? METASLAB_GANG_AVOID : 0; 234909c9d376SGeorge Wilson flags |= (zio->io_flags & ZIO_FLAG_GANG_CHILD) ? 235009c9d376SGeorge Wilson METASLAB_GANG_CHILD : 0; 2351e14bb325SJeff Bonwick error = metaslab_alloc(spa, mc, zio->io_size, bp, 235209c9d376SGeorge Wilson zio->io_prop.zp_copies, zio->io_txg, NULL, flags); 2353fa9e4066Sahrens 2354e14bb325SJeff Bonwick if (error) { 235509c9d376SGeorge Wilson spa_dbgmsg(spa, "%s: metaslab allocation failure: zio %p, " 235609c9d376SGeorge Wilson "size %llu, error %d", spa_name(spa), zio, zio->io_size, 235709c9d376SGeorge Wilson error); 2358e14bb325SJeff Bonwick if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) 2359e14bb325SJeff Bonwick return (zio_write_gang_block(zio)); 2360fa9e4066Sahrens zio->io_error = error; 2361fa9e4066Sahrens } 2362e05725b1Sbonwick 2363e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2364fa9e4066Sahrens } 2365fa9e4066Sahrens 2366e05725b1Sbonwick static int 2367fa9e4066Sahrens zio_dva_free(zio_t *zio) 2368fa9e4066Sahrens { 2369e14bb325SJeff Bonwick metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); 2370fa9e4066Sahrens 2371e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2372fa9e4066Sahrens } 2373fa9e4066Sahrens 2374e05725b1Sbonwick static int 2375fa9e4066Sahrens zio_dva_claim(zio_t *zio) 2376fa9e4066Sahrens { 2377e14bb325SJeff Bonwick int error; 2378e14bb325SJeff Bonwick 2379e14bb325SJeff Bonwick error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); 2380e14bb325SJeff Bonwick if (error) 2381e14bb325SJeff Bonwick zio->io_error = error; 2382fa9e4066Sahrens 2383e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2384fa9e4066Sahrens } 2385fa9e4066Sahrens 2386e14bb325SJeff Bonwick /* 2387e14bb325SJeff Bonwick * Undo an allocation. This is used by zio_done() when an I/O fails 2388e14bb325SJeff Bonwick * and we want to give back the block we just allocated. 2389e14bb325SJeff Bonwick * This handles both normal blocks and gang blocks. 2390e14bb325SJeff Bonwick */ 2391e14bb325SJeff Bonwick static void 2392e14bb325SJeff Bonwick zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) 2393e14bb325SJeff Bonwick { 2394e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2395b24ab676SJeff Bonwick ASSERT(zio->io_bp_override == NULL); 2396e14bb325SJeff Bonwick 2397e14bb325SJeff Bonwick if (!BP_IS_HOLE(bp)) 2398b24ab676SJeff Bonwick metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); 2399e14bb325SJeff Bonwick 2400e14bb325SJeff Bonwick if (gn != NULL) { 2401e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 2402e14bb325SJeff Bonwick zio_dva_unallocate(zio, gn->gn_child[g], 2403e14bb325SJeff Bonwick &gn->gn_gbh->zg_blkptr[g]); 2404e14bb325SJeff Bonwick } 2405e14bb325SJeff Bonwick } 2406e14bb325SJeff Bonwick } 2407e14bb325SJeff Bonwick 2408e14bb325SJeff Bonwick /* 2409e14bb325SJeff Bonwick * Try to allocate an intent log block. Return 0 on success, errno on failure. 2410e14bb325SJeff Bonwick */ 2411e14bb325SJeff Bonwick int 2412b24ab676SJeff Bonwick zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, blkptr_t *old_bp, 2413b24ab676SJeff Bonwick uint64_t size, boolean_t use_slog) 2414e14bb325SJeff Bonwick { 2415e09fa4daSNeil Perrin int error = 1; 2416e14bb325SJeff Bonwick 2417b24ab676SJeff Bonwick ASSERT(txg > spa_syncing_txg(spa)); 2418b24ab676SJeff Bonwick 2419840345f6SGeorge Wilson /* 2420840345f6SGeorge Wilson * ZIL blocks are always contiguous (i.e. not gang blocks) so we 2421840345f6SGeorge Wilson * set the METASLAB_GANG_AVOID flag so that they don't "fast gang" 2422840345f6SGeorge Wilson * when allocating them. 2423840345f6SGeorge Wilson */ 2424840345f6SGeorge Wilson if (use_slog) { 2425b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_log_class(spa), size, 2426840345f6SGeorge Wilson new_bp, 1, txg, old_bp, 2427840345f6SGeorge Wilson METASLAB_HINTBP_AVOID | METASLAB_GANG_AVOID); 2428840345f6SGeorge Wilson } 2429e14bb325SJeff Bonwick 2430840345f6SGeorge Wilson if (error) { 2431b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), size, 2432840345f6SGeorge Wilson new_bp, 1, txg, old_bp, 243322e30981SGeorge Wilson METASLAB_HINTBP_AVOID); 2434840345f6SGeorge Wilson } 2435e14bb325SJeff Bonwick 2436e14bb325SJeff Bonwick if (error == 0) { 2437e14bb325SJeff Bonwick BP_SET_LSIZE(new_bp, size); 2438e14bb325SJeff Bonwick BP_SET_PSIZE(new_bp, size); 2439e14bb325SJeff Bonwick BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); 24406e1f5caaSNeil Perrin BP_SET_CHECKSUM(new_bp, 24416e1f5caaSNeil Perrin spa_version(spa) >= SPA_VERSION_SLIM_ZIL 24426e1f5caaSNeil Perrin ? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG); 2443e14bb325SJeff Bonwick BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 2444e14bb325SJeff Bonwick BP_SET_LEVEL(new_bp, 0); 2445b24ab676SJeff Bonwick BP_SET_DEDUP(new_bp, 0); 2446e14bb325SJeff Bonwick BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); 2447e14bb325SJeff Bonwick } 2448e14bb325SJeff Bonwick 2449e14bb325SJeff Bonwick return (error); 2450e14bb325SJeff Bonwick } 2451e14bb325SJeff Bonwick 2452e14bb325SJeff Bonwick /* 2453b24ab676SJeff Bonwick * Free an intent log block. 2454e14bb325SJeff Bonwick */ 2455e14bb325SJeff Bonwick void 2456b24ab676SJeff Bonwick zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp) 2457e14bb325SJeff Bonwick { 2458b24ab676SJeff Bonwick ASSERT(BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG); 2459e14bb325SJeff Bonwick ASSERT(!BP_IS_GANG(bp)); 2460e14bb325SJeff Bonwick 2461b24ab676SJeff Bonwick zio_free(spa, txg, bp); 2462e14bb325SJeff Bonwick } 2463e14bb325SJeff Bonwick 2464fa9e4066Sahrens /* 2465fa9e4066Sahrens * ========================================================================== 2466fa9e4066Sahrens * Read and write to physical devices 2467fa9e4066Sahrens * ========================================================================== 2468fa9e4066Sahrens */ 2469e05725b1Sbonwick static int 247044cd46caSbillm zio_vdev_io_start(zio_t *zio) 2471fa9e4066Sahrens { 2472fa9e4066Sahrens vdev_t *vd = zio->io_vd; 247344cd46caSbillm uint64_t align; 24740a4e9518Sgw spa_t *spa = zio->io_spa; 24750a4e9518Sgw 2476e14bb325SJeff Bonwick ASSERT(zio->io_error == 0); 2477e14bb325SJeff Bonwick ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); 2478fa9e4066Sahrens 2479e14bb325SJeff Bonwick if (vd == NULL) { 2480e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2481e14bb325SJeff Bonwick spa_config_enter(spa, SCL_ZIO, zio, RW_READER); 2482fa9e4066Sahrens 2483e14bb325SJeff Bonwick /* 2484e14bb325SJeff Bonwick * The mirror_ops handle multiple DVAs in a single BP. 2485e14bb325SJeff Bonwick */ 2486e14bb325SJeff Bonwick return (vdev_mirror_ops.vdev_op_io_start(zio)); 2487fa9e4066Sahrens } 2488fa9e4066Sahrens 248944ecc532SGeorge Wilson /* 249044ecc532SGeorge Wilson * We keep track of time-sensitive I/Os so that the scan thread 249144ecc532SGeorge Wilson * can quickly react to certain workloads. In particular, we care 249244ecc532SGeorge Wilson * about non-scrubbing, top-level reads and writes with the following 249344ecc532SGeorge Wilson * characteristics: 249444ecc532SGeorge Wilson * - synchronous writes of user data to non-slog devices 249544ecc532SGeorge Wilson * - any reads of user data 249644ecc532SGeorge Wilson * When these conditions are met, adjust the timestamp of spa_last_io 249744ecc532SGeorge Wilson * which allows the scan thread to adjust its workload accordingly. 249844ecc532SGeorge Wilson */ 249944ecc532SGeorge Wilson if (!(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && zio->io_bp != NULL && 250044ecc532SGeorge Wilson vd == vd->vdev_top && !vd->vdev_islog && 250144ecc532SGeorge Wilson zio->io_bookmark.zb_objset != DMU_META_OBJSET && 250244ecc532SGeorge Wilson zio->io_txg != spa_syncing_txg(spa)) { 250344ecc532SGeorge Wilson uint64_t old = spa->spa_last_io; 250444ecc532SGeorge Wilson uint64_t new = ddi_get_lbolt64(); 250544ecc532SGeorge Wilson if (old != new) 250644ecc532SGeorge Wilson (void) atomic_cas_64(&spa->spa_last_io, old, new); 250744ecc532SGeorge Wilson } 250844ecc532SGeorge Wilson 2509e14bb325SJeff Bonwick align = 1ULL << vd->vdev_top->vdev_ashift; 2510e14bb325SJeff Bonwick 2511ecc2d604Sbonwick if (P2PHASE(zio->io_size, align) != 0) { 2512ecc2d604Sbonwick uint64_t asize = P2ROUNDUP(zio->io_size, align); 2513ecc2d604Sbonwick char *abuf = zio_buf_alloc(asize); 2514e14bb325SJeff Bonwick ASSERT(vd == vd->vdev_top); 2515ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_WRITE) { 2516ecc2d604Sbonwick bcopy(zio->io_data, abuf, zio->io_size); 2517ecc2d604Sbonwick bzero(abuf + zio->io_size, asize - zio->io_size); 2518ecc2d604Sbonwick } 2519e14bb325SJeff Bonwick zio_push_transform(zio, abuf, asize, asize, zio_subblock); 2520ecc2d604Sbonwick } 2521ecc2d604Sbonwick 2522ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_offset, align) == 0); 2523ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_size, align) == 0); 2524f9af39baSGeorge Wilson VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); 25258ad4d6ddSJeff Bonwick 25268ad4d6ddSJeff Bonwick /* 25278ad4d6ddSJeff Bonwick * If this is a repair I/O, and there's no self-healing involved -- 25288ad4d6ddSJeff Bonwick * that is, we're just resilvering what we expect to resilver -- 25298ad4d6ddSJeff Bonwick * then don't do the I/O unless zio's txg is actually in vd's DTL. 25308ad4d6ddSJeff Bonwick * This prevents spurious resilvering with nested replication. 25318ad4d6ddSJeff Bonwick * For example, given a mirror of mirrors, (A+B)+(C+D), if only 25328ad4d6ddSJeff Bonwick * A is out of date, we'll read from C+D, then use the data to 25338ad4d6ddSJeff Bonwick * resilver A+B -- but we don't actually want to resilver B, just A. 25348ad4d6ddSJeff Bonwick * The top-level mirror has no way to know this, so instead we just 25358ad4d6ddSJeff Bonwick * discard unnecessary repairs as we work our way down the vdev tree. 25368ad4d6ddSJeff Bonwick * The same logic applies to any form of nested replication: 25378ad4d6ddSJeff Bonwick * ditto + mirror, RAID-Z + replacing, etc. This covers them all. 25388ad4d6ddSJeff Bonwick */ 25398ad4d6ddSJeff Bonwick if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && 25408ad4d6ddSJeff Bonwick !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && 25418ad4d6ddSJeff Bonwick zio->io_txg != 0 && /* not a delegated i/o */ 25428ad4d6ddSJeff Bonwick !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { 25438ad4d6ddSJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 25448ad4d6ddSJeff Bonwick zio_vdev_io_bypass(zio); 25458ad4d6ddSJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 25468ad4d6ddSJeff Bonwick } 2547fa9e4066Sahrens 2548e14bb325SJeff Bonwick if (vd->vdev_ops->vdev_op_leaf && 2549e14bb325SJeff Bonwick (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { 2550e14bb325SJeff Bonwick 255143466aaeSMax Grossman if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio)) 2552a3f829aeSBill Moore return (ZIO_PIPELINE_CONTINUE); 2553e14bb325SJeff Bonwick 2554e14bb325SJeff Bonwick if ((zio = vdev_queue_io(zio)) == NULL) 2555e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2556e14bb325SJeff Bonwick 2557e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2558be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(ENXIO); 2559e14bb325SJeff Bonwick zio_interrupt(zio); 2560e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2561e14bb325SJeff Bonwick } 2562e14bb325SJeff Bonwick } 2563e14bb325SJeff Bonwick 2564e05725b1Sbonwick return (vd->vdev_ops->vdev_op_io_start(zio)); 2565fa9e4066Sahrens } 2566fa9e4066Sahrens 2567e05725b1Sbonwick static int 2568fa9e4066Sahrens zio_vdev_io_done(zio_t *zio) 2569fa9e4066Sahrens { 2570e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2571e14bb325SJeff Bonwick vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; 2572e14bb325SJeff Bonwick boolean_t unexpected_error = B_FALSE; 2573e05725b1Sbonwick 2574e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2575e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2576fa9e4066Sahrens 2577e14bb325SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); 2578e14bb325SJeff Bonwick 2579e14bb325SJeff Bonwick if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { 2580e14bb325SJeff Bonwick 2581e14bb325SJeff Bonwick vdev_queue_io_done(zio); 2582fa9e4066Sahrens 2583e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE) 2584e14bb325SJeff Bonwick vdev_cache_write(zio); 2585e14bb325SJeff Bonwick 2586e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 25878956713aSEric Schrock zio->io_error = zio_handle_device_injection(vd, 25888956713aSEric Schrock zio, EIO); 2589e14bb325SJeff Bonwick 2590e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2591e14bb325SJeff Bonwick zio->io_error = zio_handle_label_injection(zio, EIO); 2592e14bb325SJeff Bonwick 2593e14bb325SJeff Bonwick if (zio->io_error) { 2594e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2595be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(ENXIO); 2596e14bb325SJeff Bonwick } else { 2597e14bb325SJeff Bonwick unexpected_error = B_TRUE; 2598e14bb325SJeff Bonwick } 2599e14bb325SJeff Bonwick } 260051ece835Seschrock } 2601fa9e4066Sahrens 2602e14bb325SJeff Bonwick ops->vdev_op_io_done(zio); 2603e14bb325SJeff Bonwick 2604e14bb325SJeff Bonwick if (unexpected_error) 2605a3f829aeSBill Moore VERIFY(vdev_probe(vd, zio) == NULL); 2606e14bb325SJeff Bonwick 2607e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2608fa9e4066Sahrens } 2609fa9e4066Sahrens 261022fe2c88SJonathan Adams /* 261122fe2c88SJonathan Adams * For non-raidz ZIOs, we can just copy aside the bad data read from the 261222fe2c88SJonathan Adams * disk, and use that to finish the checksum ereport later. 261322fe2c88SJonathan Adams */ 261422fe2c88SJonathan Adams static void 261522fe2c88SJonathan Adams zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, 261622fe2c88SJonathan Adams const void *good_buf) 261722fe2c88SJonathan Adams { 261822fe2c88SJonathan Adams /* no processing needed */ 261922fe2c88SJonathan Adams zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); 262022fe2c88SJonathan Adams } 262122fe2c88SJonathan Adams 262222fe2c88SJonathan Adams /*ARGSUSED*/ 262322fe2c88SJonathan Adams void 262422fe2c88SJonathan Adams zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) 262522fe2c88SJonathan Adams { 262622fe2c88SJonathan Adams void *buf = zio_buf_alloc(zio->io_size); 262722fe2c88SJonathan Adams 262822fe2c88SJonathan Adams bcopy(zio->io_data, buf, zio->io_size); 262922fe2c88SJonathan Adams 263022fe2c88SJonathan Adams zcr->zcr_cbinfo = zio->io_size; 263122fe2c88SJonathan Adams zcr->zcr_cbdata = buf; 263222fe2c88SJonathan Adams zcr->zcr_finish = zio_vsd_default_cksum_finish; 263322fe2c88SJonathan Adams zcr->zcr_free = zio_buf_free; 263422fe2c88SJonathan Adams } 263522fe2c88SJonathan Adams 2636e05725b1Sbonwick static int 2637fa9e4066Sahrens zio_vdev_io_assess(zio_t *zio) 2638fa9e4066Sahrens { 2639fa9e4066Sahrens vdev_t *vd = zio->io_vd; 2640e14bb325SJeff Bonwick 2641e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2642e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2643e14bb325SJeff Bonwick 2644e14bb325SJeff Bonwick if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2645e14bb325SJeff Bonwick spa_config_exit(zio->io_spa, SCL_ZIO, zio); 2646e14bb325SJeff Bonwick 2647e14bb325SJeff Bonwick if (zio->io_vsd != NULL) { 264822fe2c88SJonathan Adams zio->io_vsd_ops->vsd_free(zio); 2649e14bb325SJeff Bonwick zio->io_vsd = NULL; 2650ecc2d604Sbonwick } 2651ecc2d604Sbonwick 2652e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2653ea8dc4b6Seschrock zio->io_error = zio_handle_fault_injection(zio, EIO); 2654ea8dc4b6Seschrock 2655fa9e4066Sahrens /* 2656fa9e4066Sahrens * If the I/O failed, determine whether we should attempt to retry it. 265735a5a358SJonathan Adams * 265835a5a358SJonathan Adams * On retry, we cut in line in the issue queue, since we don't want 265935a5a358SJonathan Adams * compression/checksumming/etc. work to prevent our (cheap) IO reissue. 2660fa9e4066Sahrens */ 2661e14bb325SJeff Bonwick if (zio->io_error && vd == NULL && 2662e14bb325SJeff Bonwick !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { 2663e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ 2664e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ 2665fa9e4066Sahrens zio->io_error = 0; 2666e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_RETRY | 2667e14bb325SJeff Bonwick ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; 2668b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; 266935a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, 267035a5a358SJonathan Adams zio_requeue_io_start_cut_in_line); 2671e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2672ea8dc4b6Seschrock } 2673fa9e4066Sahrens 2674e14bb325SJeff Bonwick /* 2675e14bb325SJeff Bonwick * If we got an error on a leaf device, convert it to ENXIO 2676e14bb325SJeff Bonwick * if the device is not accessible at all. 2677e14bb325SJeff Bonwick */ 2678e14bb325SJeff Bonwick if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && 2679e14bb325SJeff Bonwick !vdev_accessible(vd, zio)) 2680be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(ENXIO); 2681e14bb325SJeff Bonwick 2682e14bb325SJeff Bonwick /* 2683e14bb325SJeff Bonwick * If we can't write to an interior vdev (mirror or RAID-Z), 2684e14bb325SJeff Bonwick * set vdev_cant_write so that we stop trying to allocate from it. 2685e14bb325SJeff Bonwick */ 2686e14bb325SJeff Bonwick if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && 26873b2aab18SMatthew Ahrens vd != NULL && !vd->vdev_ops->vdev_op_leaf) { 2688e14bb325SJeff Bonwick vd->vdev_cant_write = B_TRUE; 26893b2aab18SMatthew Ahrens } 2690e14bb325SJeff Bonwick 2691e14bb325SJeff Bonwick if (zio->io_error) 2692e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2693e14bb325SJeff Bonwick 269469962b56SMatthew Ahrens if (vd != NULL && vd->vdev_ops->vdev_op_leaf && 269569962b56SMatthew Ahrens zio->io_physdone != NULL) { 269669962b56SMatthew Ahrens ASSERT(!(zio->io_flags & ZIO_FLAG_DELEGATED)); 269769962b56SMatthew Ahrens ASSERT(zio->io_child_type == ZIO_CHILD_VDEV); 269869962b56SMatthew Ahrens zio->io_physdone(zio->io_logical); 269969962b56SMatthew Ahrens } 270069962b56SMatthew Ahrens 2701e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2702fa9e4066Sahrens } 2703fa9e4066Sahrens 2704fa9e4066Sahrens void 2705fa9e4066Sahrens zio_vdev_io_reissue(zio_t *zio) 2706fa9e4066Sahrens { 2707fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2708fa9e4066Sahrens ASSERT(zio->io_error == 0); 2709fa9e4066Sahrens 2710b24ab676SJeff Bonwick zio->io_stage >>= 1; 2711fa9e4066Sahrens } 2712fa9e4066Sahrens 2713fa9e4066Sahrens void 2714fa9e4066Sahrens zio_vdev_io_redone(zio_t *zio) 2715fa9e4066Sahrens { 2716fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); 2717fa9e4066Sahrens 2718b24ab676SJeff Bonwick zio->io_stage >>= 1; 2719fa9e4066Sahrens } 2720fa9e4066Sahrens 2721fa9e4066Sahrens void 2722fa9e4066Sahrens zio_vdev_io_bypass(zio_t *zio) 2723fa9e4066Sahrens { 2724fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2725fa9e4066Sahrens ASSERT(zio->io_error == 0); 2726fa9e4066Sahrens 2727fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_IO_BYPASS; 2728b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; 2729fa9e4066Sahrens } 2730fa9e4066Sahrens 2731fa9e4066Sahrens /* 2732fa9e4066Sahrens * ========================================================================== 2733fa9e4066Sahrens * Generate and verify checksums 2734fa9e4066Sahrens * ========================================================================== 2735fa9e4066Sahrens */ 2736e05725b1Sbonwick static int 2737fa9e4066Sahrens zio_checksum_generate(zio_t *zio) 2738fa9e4066Sahrens { 2739fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2740e14bb325SJeff Bonwick enum zio_checksum checksum; 2741fa9e4066Sahrens 2742e14bb325SJeff Bonwick if (bp == NULL) { 2743e14bb325SJeff Bonwick /* 2744e14bb325SJeff Bonwick * This is zio_write_phys(). 2745e14bb325SJeff Bonwick * We're either generating a label checksum, or none at all. 2746e14bb325SJeff Bonwick */ 2747e14bb325SJeff Bonwick checksum = zio->io_prop.zp_checksum; 2748e14bb325SJeff Bonwick 2749e14bb325SJeff Bonwick if (checksum == ZIO_CHECKSUM_OFF) 2750e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2751fa9e4066Sahrens 2752e14bb325SJeff Bonwick ASSERT(checksum == ZIO_CHECKSUM_LABEL); 2753e14bb325SJeff Bonwick } else { 2754e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { 2755e14bb325SJeff Bonwick ASSERT(!IO_IS_ALLOCATING(zio)); 2756e14bb325SJeff Bonwick checksum = ZIO_CHECKSUM_GANG_HEADER; 2757e14bb325SJeff Bonwick } else { 2758e14bb325SJeff Bonwick checksum = BP_GET_CHECKSUM(bp); 2759e14bb325SJeff Bonwick } 2760e14bb325SJeff Bonwick } 2761fa9e4066Sahrens 2762e14bb325SJeff Bonwick zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); 2763fa9e4066Sahrens 2764e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2765fa9e4066Sahrens } 2766fa9e4066Sahrens 2767e05725b1Sbonwick static int 2768e14bb325SJeff Bonwick zio_checksum_verify(zio_t *zio) 2769fa9e4066Sahrens { 277022fe2c88SJonathan Adams zio_bad_cksum_t info; 2771e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2772e14bb325SJeff Bonwick int error; 2773fa9e4066Sahrens 2774b24ab676SJeff Bonwick ASSERT(zio->io_vd != NULL); 2775b24ab676SJeff Bonwick 2776e14bb325SJeff Bonwick if (bp == NULL) { 2777e14bb325SJeff Bonwick /* 2778e14bb325SJeff Bonwick * This is zio_read_phys(). 2779e14bb325SJeff Bonwick * We're either verifying a label checksum, or nothing at all. 2780e14bb325SJeff Bonwick */ 2781e14bb325SJeff Bonwick if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) 2782e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2783fa9e4066Sahrens 2784e14bb325SJeff Bonwick ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); 2785e14bb325SJeff Bonwick } 2786fa9e4066Sahrens 278722fe2c88SJonathan Adams if ((error = zio_checksum_error(zio, &info)) != 0) { 2788e14bb325SJeff Bonwick zio->io_error = error; 2789e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { 279022fe2c88SJonathan Adams zfs_ereport_start_checksum(zio->io_spa, 279122fe2c88SJonathan Adams zio->io_vd, zio, zio->io_offset, 279222fe2c88SJonathan Adams zio->io_size, NULL, &info); 2793e14bb325SJeff Bonwick } 2794fa9e4066Sahrens } 2795fa9e4066Sahrens 2796e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2797fa9e4066Sahrens } 2798fa9e4066Sahrens 2799fa9e4066Sahrens /* 2800fa9e4066Sahrens * Called by RAID-Z to ensure we don't compute the checksum twice. 2801fa9e4066Sahrens */ 2802fa9e4066Sahrens void 2803fa9e4066Sahrens zio_checksum_verified(zio_t *zio) 2804fa9e4066Sahrens { 2805b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 2806fa9e4066Sahrens } 2807fa9e4066Sahrens 2808fa9e4066Sahrens /* 2809e14bb325SJeff Bonwick * ========================================================================== 2810e14bb325SJeff Bonwick * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. 2811*5d7b4d43SMatthew Ahrens * An error of 0 indicates success. ENXIO indicates whole-device failure, 2812e14bb325SJeff Bonwick * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO 2813e14bb325SJeff Bonwick * indicate errors that are specific to one I/O, and most likely permanent. 2814e14bb325SJeff Bonwick * Any other error is presumed to be worse because we weren't expecting it. 2815e14bb325SJeff Bonwick * ========================================================================== 2816fa9e4066Sahrens */ 2817e14bb325SJeff Bonwick int 2818e14bb325SJeff Bonwick zio_worst_error(int e1, int e2) 2819fa9e4066Sahrens { 2820e14bb325SJeff Bonwick static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; 2821e14bb325SJeff Bonwick int r1, r2; 2822e14bb325SJeff Bonwick 2823e14bb325SJeff Bonwick for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) 2824e14bb325SJeff Bonwick if (e1 == zio_error_rank[r1]) 2825e14bb325SJeff Bonwick break; 2826e14bb325SJeff Bonwick 2827e14bb325SJeff Bonwick for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) 2828e14bb325SJeff Bonwick if (e2 == zio_error_rank[r2]) 2829e14bb325SJeff Bonwick break; 283044cd46caSbillm 2831e14bb325SJeff Bonwick return (r1 > r2 ? e1 : e2); 2832fa9e4066Sahrens } 2833fa9e4066Sahrens 2834fa9e4066Sahrens /* 2835fa9e4066Sahrens * ========================================================================== 2836e14bb325SJeff Bonwick * I/O completion 2837fa9e4066Sahrens * ========================================================================== 2838fa9e4066Sahrens */ 2839e14bb325SJeff Bonwick static int 2840e14bb325SJeff Bonwick zio_ready(zio_t *zio) 2841fa9e4066Sahrens { 2842e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2843a3f829aeSBill Moore zio_t *pio, *pio_next; 2844fa9e4066Sahrens 2845b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 2846b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_READY)) 2847f5383399SBill Moore return (ZIO_PIPELINE_STOP); 2848fa9e4066Sahrens 2849f5383399SBill Moore if (zio->io_ready) { 2850e14bb325SJeff Bonwick ASSERT(IO_IS_ALLOCATING(zio)); 285180901aeaSGeorge Wilson ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp) || 285280901aeaSGeorge Wilson (zio->io_flags & ZIO_FLAG_NOPWRITE)); 2853e14bb325SJeff Bonwick ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); 2854fa9e4066Sahrens 2855e14bb325SJeff Bonwick zio->io_ready(zio); 2856e14bb325SJeff Bonwick } 2857fa9e4066Sahrens 2858e14bb325SJeff Bonwick if (bp != NULL && bp != &zio->io_bp_copy) 2859e14bb325SJeff Bonwick zio->io_bp_copy = *bp; 2860fa9e4066Sahrens 2861e14bb325SJeff Bonwick if (zio->io_error) 2862e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2863fa9e4066Sahrens 2864a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2865a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = 1; 2866a3f829aeSBill Moore pio = zio_walk_parents(zio); 2867a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2868a3f829aeSBill Moore 2869a3f829aeSBill Moore /* 2870a3f829aeSBill Moore * As we notify zio's parents, new parents could be added. 2871a3f829aeSBill Moore * New parents go to the head of zio's io_parent_list, however, 2872a3f829aeSBill Moore * so we will (correctly) not notify them. The remainder of zio's 2873a3f829aeSBill Moore * io_parent_list, from 'pio_next' onward, cannot change because 2874a3f829aeSBill Moore * all parents must wait for us to be done before they can be done. 2875a3f829aeSBill Moore */ 2876a3f829aeSBill Moore for (; pio != NULL; pio = pio_next) { 2877a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2878e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_READY); 2879a3f829aeSBill Moore } 2880fa9e4066Sahrens 2881b24ab676SJeff Bonwick if (zio->io_flags & ZIO_FLAG_NODATA) { 2882b24ab676SJeff Bonwick if (BP_IS_GANG(bp)) { 2883b24ab676SJeff Bonwick zio->io_flags &= ~ZIO_FLAG_NODATA; 2884b24ab676SJeff Bonwick } else { 2885b24ab676SJeff Bonwick ASSERT((uintptr_t)zio->io_data < SPA_MAXBLOCKSIZE); 2886b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 2887b24ab676SJeff Bonwick } 2888b24ab676SJeff Bonwick } 2889b24ab676SJeff Bonwick 2890a33cae98STim Haley if (zio_injection_enabled && 2891a33cae98STim Haley zio->io_spa->spa_syncing_txg == zio->io_txg) 2892a33cae98STim Haley zio_handle_ignored_writes(zio); 2893a33cae98STim Haley 2894e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2895fa9e4066Sahrens } 2896fa9e4066Sahrens 2897e14bb325SJeff Bonwick static int 2898e14bb325SJeff Bonwick zio_done(zio_t *zio) 2899d63d470bSgw { 2900e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 2901e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 2902e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2903e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2904e14bb325SJeff Bonwick uint64_t psize = zio->io_size; 2905a3f829aeSBill Moore zio_t *pio, *pio_next; 2906d63d470bSgw 2907e14bb325SJeff Bonwick /* 2908f5383399SBill Moore * If our children haven't all completed, 2909e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 2910e14bb325SJeff Bonwick */ 2911e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || 2912e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || 2913b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE) || 2914e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) 2915e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2916d63d470bSgw 2917e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 2918e14bb325SJeff Bonwick for (int w = 0; w < ZIO_WAIT_TYPES; w++) 2919e14bb325SJeff Bonwick ASSERT(zio->io_children[c][w] == 0); 2920e14bb325SJeff Bonwick 2921*5d7b4d43SMatthew Ahrens if (bp != NULL && !BP_IS_EMBEDDED(bp)) { 2922e14bb325SJeff Bonwick ASSERT(bp->blk_pad[0] == 0); 2923e14bb325SJeff Bonwick ASSERT(bp->blk_pad[1] == 0); 2924e14bb325SJeff Bonwick ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || 2925a3f829aeSBill Moore (bp == zio_unique_parent(zio)->io_bp)); 2926e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && 2927b24ab676SJeff Bonwick zio->io_bp_override == NULL && 2928e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { 2929e14bb325SJeff Bonwick ASSERT(!BP_SHOULD_BYTESWAP(bp)); 2930b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(bp)); 2931e14bb325SJeff Bonwick ASSERT(BP_COUNT_GANG(bp) == 0 || 2932e14bb325SJeff Bonwick (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); 2933e14bb325SJeff Bonwick } 293480901aeaSGeorge Wilson if (zio->io_flags & ZIO_FLAG_NOPWRITE) 293580901aeaSGeorge Wilson VERIFY(BP_EQUAL(bp, &zio->io_bp_orig)); 2936e14bb325SJeff Bonwick } 2937fa9e4066Sahrens 2938e14bb325SJeff Bonwick /* 2939b24ab676SJeff Bonwick * If there were child vdev/gang/ddt errors, they apply to us now. 2940e14bb325SJeff Bonwick */ 2941e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); 2942e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_GANG); 2943b24ab676SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_DDT); 2944b24ab676SJeff Bonwick 2945b24ab676SJeff Bonwick /* 2946b24ab676SJeff Bonwick * If the I/O on the transformed data was successful, generate any 2947b24ab676SJeff Bonwick * checksum reports now while we still have the transformed data. 2948b24ab676SJeff Bonwick */ 2949b24ab676SJeff Bonwick if (zio->io_error == 0) { 2950b24ab676SJeff Bonwick while (zio->io_cksum_report != NULL) { 2951b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 2952b24ab676SJeff Bonwick uint64_t align = zcr->zcr_align; 2953b24ab676SJeff Bonwick uint64_t asize = P2ROUNDUP(psize, align); 2954b24ab676SJeff Bonwick char *abuf = zio->io_data; 2955b24ab676SJeff Bonwick 2956b24ab676SJeff Bonwick if (asize != psize) { 2957b24ab676SJeff Bonwick abuf = zio_buf_alloc(asize); 2958b24ab676SJeff Bonwick bcopy(zio->io_data, abuf, psize); 2959b24ab676SJeff Bonwick bzero(abuf + psize, asize - psize); 2960b24ab676SJeff Bonwick } 2961b24ab676SJeff Bonwick 2962b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 2963b24ab676SJeff Bonwick zcr->zcr_next = NULL; 2964b24ab676SJeff Bonwick zcr->zcr_finish(zcr, abuf); 2965b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 2966b24ab676SJeff Bonwick 2967b24ab676SJeff Bonwick if (asize != psize) 2968b24ab676SJeff Bonwick zio_buf_free(abuf, asize); 2969b24ab676SJeff Bonwick } 2970b24ab676SJeff Bonwick } 2971e14bb325SJeff Bonwick 2972e14bb325SJeff Bonwick zio_pop_transforms(zio); /* note: may set zio->io_error */ 2973e14bb325SJeff Bonwick 2974e14bb325SJeff Bonwick vdev_stat_update(zio, psize); 2975e14bb325SJeff Bonwick 2976e14bb325SJeff Bonwick if (zio->io_error) { 2977e14bb325SJeff Bonwick /* 2978e14bb325SJeff Bonwick * If this I/O is attached to a particular vdev, 2979e14bb325SJeff Bonwick * generate an error message describing the I/O failure 2980e14bb325SJeff Bonwick * at the block level. We ignore these errors if the 2981e14bb325SJeff Bonwick * device is currently unavailable. 2982e14bb325SJeff Bonwick */ 2983e14bb325SJeff Bonwick if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) 2984e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, zio, 0, 0); 2985e14bb325SJeff Bonwick 29868f18d1faSGeorge Wilson if ((zio->io_error == EIO || !(zio->io_flags & 29878f18d1faSGeorge Wilson (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && 29888f18d1faSGeorge Wilson zio == lio) { 2989e14bb325SJeff Bonwick /* 2990e14bb325SJeff Bonwick * For logical I/O requests, tell the SPA to log the 2991e14bb325SJeff Bonwick * error and generate a logical data ereport. 2992e14bb325SJeff Bonwick */ 2993e14bb325SJeff Bonwick spa_log_error(spa, zio); 2994e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, zio, 2995e14bb325SJeff Bonwick 0, 0); 2996e14bb325SJeff Bonwick } 2997e14bb325SJeff Bonwick } 2998fa9e4066Sahrens 2999e14bb325SJeff Bonwick if (zio->io_error && zio == lio) { 3000e14bb325SJeff Bonwick /* 3001e14bb325SJeff Bonwick * Determine whether zio should be reexecuted. This will 3002e14bb325SJeff Bonwick * propagate all the way to the root via zio_notify_parent(). 3003e14bb325SJeff Bonwick */ 3004e14bb325SJeff Bonwick ASSERT(vd == NULL && bp != NULL); 3005b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 3006e14bb325SJeff Bonwick 3007b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(zio) && 3008b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_CANFAIL)) { 3009e14bb325SJeff Bonwick if (zio->io_error != ENOSPC) 3010e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_NOW; 3011e14bb325SJeff Bonwick else 3012e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 3013b24ab676SJeff Bonwick } 3014e14bb325SJeff Bonwick 3015e14bb325SJeff Bonwick if ((zio->io_type == ZIO_TYPE_READ || 3016e14bb325SJeff Bonwick zio->io_type == ZIO_TYPE_FREE) && 301744ecc532SGeorge Wilson !(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && 3018e14bb325SJeff Bonwick zio->io_error == ENXIO && 3019b16da2e2SGeorge Wilson spa_load_state(spa) == SPA_LOAD_NONE && 3020e14bb325SJeff Bonwick spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) 3021e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 3022e14bb325SJeff Bonwick 3023e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) 3024e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 302522fe2c88SJonathan Adams 302622fe2c88SJonathan Adams /* 302722fe2c88SJonathan Adams * Here is a possibly good place to attempt to do 302822fe2c88SJonathan Adams * either combinatorial reconstruction or error correction 302922fe2c88SJonathan Adams * based on checksums. It also might be a good place 303022fe2c88SJonathan Adams * to send out preliminary ereports before we suspend 303122fe2c88SJonathan Adams * processing. 303222fe2c88SJonathan Adams */ 3033d63d470bSgw } 3034d63d470bSgw 303567bd71c6Sperrin /* 3036e14bb325SJeff Bonwick * If there were logical child errors, they apply to us now. 3037e14bb325SJeff Bonwick * We defer this until now to avoid conflating logical child 3038e14bb325SJeff Bonwick * errors with errors that happened to the zio itself when 3039e14bb325SJeff Bonwick * updating vdev stats and reporting FMA events above. 304067bd71c6Sperrin */ 3041e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); 30428654d025Sperrin 3043b24ab676SJeff Bonwick if ((zio->io_error || zio->io_reexecute) && 3044b24ab676SJeff Bonwick IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && 304580901aeaSGeorge Wilson !(zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE))) 3046f5383399SBill Moore zio_dva_unallocate(zio, zio->io_gang_tree, bp); 3047f5383399SBill Moore 3048f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 3049f5383399SBill Moore 305033a372edSGeorge Wilson /* 305133a372edSGeorge Wilson * Godfather I/Os should never suspend. 305233a372edSGeorge Wilson */ 305333a372edSGeorge Wilson if ((zio->io_flags & ZIO_FLAG_GODFATHER) && 305433a372edSGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) 305533a372edSGeorge Wilson zio->io_reexecute = 0; 305633a372edSGeorge Wilson 305733a372edSGeorge Wilson if (zio->io_reexecute) { 3058e14bb325SJeff Bonwick /* 3059e14bb325SJeff Bonwick * This is a logical I/O that wants to reexecute. 3060e14bb325SJeff Bonwick * 3061e14bb325SJeff Bonwick * Reexecute is top-down. When an i/o fails, if it's not 3062e14bb325SJeff Bonwick * the root, it simply notifies its parent and sticks around. 3063e14bb325SJeff Bonwick * The parent, seeing that it still has children in zio_done(), 3064e14bb325SJeff Bonwick * does the same. This percolates all the way up to the root. 3065e14bb325SJeff Bonwick * The root i/o will reexecute or suspend the entire tree. 3066e14bb325SJeff Bonwick * 3067e14bb325SJeff Bonwick * This approach ensures that zio_reexecute() honors 3068e14bb325SJeff Bonwick * all the original i/o dependency relationships, e.g. 3069e14bb325SJeff Bonwick * parents not executing until children are ready. 3070e14bb325SJeff Bonwick */ 3071e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 3072fa9e4066Sahrens 3073f5383399SBill Moore zio->io_gang_leader = NULL; 3074e14bb325SJeff Bonwick 3075a3f829aeSBill Moore mutex_enter(&zio->io_lock); 3076a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 3077a3f829aeSBill Moore mutex_exit(&zio->io_lock); 3078a3f829aeSBill Moore 307954d692b7SGeorge Wilson /* 308054d692b7SGeorge Wilson * "The Godfather" I/O monitors its children but is 308154d692b7SGeorge Wilson * not a true parent to them. It will track them through 308254d692b7SGeorge Wilson * the pipeline but severs its ties whenever they get into 308354d692b7SGeorge Wilson * trouble (e.g. suspended). This allows "The Godfather" 308454d692b7SGeorge Wilson * I/O to return status without blocking. 308554d692b7SGeorge Wilson */ 308654d692b7SGeorge Wilson for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 308754d692b7SGeorge Wilson zio_link_t *zl = zio->io_walk_link; 308854d692b7SGeorge Wilson pio_next = zio_walk_parents(zio); 308954d692b7SGeorge Wilson 309054d692b7SGeorge Wilson if ((pio->io_flags & ZIO_FLAG_GODFATHER) && 309154d692b7SGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { 309254d692b7SGeorge Wilson zio_remove_child(pio, zio, zl); 309354d692b7SGeorge Wilson zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 309454d692b7SGeorge Wilson } 309554d692b7SGeorge Wilson } 309654d692b7SGeorge Wilson 3097a3f829aeSBill Moore if ((pio = zio_unique_parent(zio)) != NULL) { 3098e14bb325SJeff Bonwick /* 3099e14bb325SJeff Bonwick * We're not a root i/o, so there's nothing to do 3100e14bb325SJeff Bonwick * but notify our parent. Don't propagate errors 3101e14bb325SJeff Bonwick * upward since we haven't permanently failed yet. 3102e14bb325SJeff Bonwick */ 310333a372edSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 3104e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; 3105e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 3106e14bb325SJeff Bonwick } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { 3107e14bb325SJeff Bonwick /* 3108e14bb325SJeff Bonwick * We'd fail again if we reexecuted now, so suspend 3109e14bb325SJeff Bonwick * until conditions improve (e.g. device comes online). 3110e14bb325SJeff Bonwick */ 3111e14bb325SJeff Bonwick zio_suspend(spa, zio); 3112e14bb325SJeff Bonwick } else { 3113e14bb325SJeff Bonwick /* 3114e14bb325SJeff Bonwick * Reexecution is potentially a huge amount of work. 3115e14bb325SJeff Bonwick * Hand it off to the otherwise-unused claim taskq. 3116e14bb325SJeff Bonwick */ 31175aeb9474SGarrett D'Amore ASSERT(zio->io_tqent.tqent_next == NULL); 3118ec94d322SAdam Leventhal spa_taskq_dispatch_ent(spa, ZIO_TYPE_CLAIM, 3119ec94d322SAdam Leventhal ZIO_TASKQ_ISSUE, (task_func_t *)zio_reexecute, zio, 3120ec94d322SAdam Leventhal 0, &zio->io_tqent); 3121e14bb325SJeff Bonwick } 3122e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3123fa9e4066Sahrens } 3124fa9e4066Sahrens 3125b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 312633a372edSGeorge Wilson ASSERT(zio->io_reexecute == 0); 3127e14bb325SJeff Bonwick ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); 3128fa9e4066Sahrens 3129b24ab676SJeff Bonwick /* 3130b24ab676SJeff Bonwick * Report any checksum errors, since the I/O is complete. 3131b24ab676SJeff Bonwick */ 313222fe2c88SJonathan Adams while (zio->io_cksum_report != NULL) { 3133b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 3134b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 3135b24ab676SJeff Bonwick zcr->zcr_next = NULL; 3136b24ab676SJeff Bonwick zcr->zcr_finish(zcr, NULL); 3137b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 313822fe2c88SJonathan Adams } 313922fe2c88SJonathan Adams 3140a3f829aeSBill Moore /* 3141a3f829aeSBill Moore * It is the responsibility of the done callback to ensure that this 3142a3f829aeSBill Moore * particular zio is no longer discoverable for adoption, and as 3143a3f829aeSBill Moore * such, cannot acquire any new parents. 3144a3f829aeSBill Moore */ 3145e14bb325SJeff Bonwick if (zio->io_done) 3146e14bb325SJeff Bonwick zio->io_done(zio); 3147fa9e4066Sahrens 3148a3f829aeSBill Moore mutex_enter(&zio->io_lock); 3149a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 3150a3f829aeSBill Moore mutex_exit(&zio->io_lock); 3151fa9e4066Sahrens 3152a3f829aeSBill Moore for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 3153a3f829aeSBill Moore zio_link_t *zl = zio->io_walk_link; 3154a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 3155a3f829aeSBill Moore zio_remove_child(pio, zio, zl); 3156e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 3157e14bb325SJeff Bonwick } 3158fa9e4066Sahrens 3159e14bb325SJeff Bonwick if (zio->io_waiter != NULL) { 3160e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 3161e14bb325SJeff Bonwick zio->io_executor = NULL; 3162e14bb325SJeff Bonwick cv_broadcast(&zio->io_cv); 3163e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 3164e14bb325SJeff Bonwick } else { 3165e14bb325SJeff Bonwick zio_destroy(zio); 3166e14bb325SJeff Bonwick } 3167fa9e4066Sahrens 3168e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3169fa9e4066Sahrens } 317046341222Sperrin 317146341222Sperrin /* 3172e14bb325SJeff Bonwick * ========================================================================== 3173e14bb325SJeff Bonwick * I/O pipeline definition 3174e14bb325SJeff Bonwick * ========================================================================== 317546341222Sperrin */ 3176b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[] = { 3177e14bb325SJeff Bonwick NULL, 3178e14bb325SJeff Bonwick zio_read_bp_init, 3179b24ab676SJeff Bonwick zio_free_bp_init, 3180b24ab676SJeff Bonwick zio_issue_async, 3181e14bb325SJeff Bonwick zio_write_bp_init, 3182e14bb325SJeff Bonwick zio_checksum_generate, 318380901aeaSGeorge Wilson zio_nop_write, 3184b24ab676SJeff Bonwick zio_ddt_read_start, 3185b24ab676SJeff Bonwick zio_ddt_read_done, 3186b24ab676SJeff Bonwick zio_ddt_write, 3187b24ab676SJeff Bonwick zio_ddt_free, 3188e14bb325SJeff Bonwick zio_gang_assemble, 3189e14bb325SJeff Bonwick zio_gang_issue, 3190e14bb325SJeff Bonwick zio_dva_allocate, 3191e14bb325SJeff Bonwick zio_dva_free, 3192e14bb325SJeff Bonwick zio_dva_claim, 3193e14bb325SJeff Bonwick zio_ready, 3194e14bb325SJeff Bonwick zio_vdev_io_start, 3195e14bb325SJeff Bonwick zio_vdev_io_done, 3196e14bb325SJeff Bonwick zio_vdev_io_assess, 3197e14bb325SJeff Bonwick zio_checksum_verify, 3198e14bb325SJeff Bonwick zio_done 3199e14bb325SJeff Bonwick }; 3200ad135b5dSChristopher Siden 3201ad135b5dSChristopher Siden /* dnp is the dnode for zb1->zb_object */ 3202ad135b5dSChristopher Siden boolean_t 3203ad135b5dSChristopher Siden zbookmark_is_before(const dnode_phys_t *dnp, const zbookmark_t *zb1, 3204ad135b5dSChristopher Siden const zbookmark_t *zb2) 3205ad135b5dSChristopher Siden { 3206ad135b5dSChristopher Siden uint64_t zb1nextL0, zb2thisobj; 3207ad135b5dSChristopher Siden 3208ad135b5dSChristopher Siden ASSERT(zb1->zb_objset == zb2->zb_objset); 3209ad135b5dSChristopher Siden ASSERT(zb2->zb_level == 0); 3210ad135b5dSChristopher Siden 3211ad135b5dSChristopher Siden /* 3212ad135b5dSChristopher Siden * A bookmark in the deadlist is considered to be after 3213ad135b5dSChristopher Siden * everything else. 3214ad135b5dSChristopher Siden */ 3215ad135b5dSChristopher Siden if (zb2->zb_object == DMU_DEADLIST_OBJECT) 3216ad135b5dSChristopher Siden return (B_TRUE); 3217ad135b5dSChristopher Siden 3218ad135b5dSChristopher Siden /* The objset_phys_t isn't before anything. */ 3219ad135b5dSChristopher Siden if (dnp == NULL) 3220ad135b5dSChristopher Siden return (B_FALSE); 3221ad135b5dSChristopher Siden 3222ad135b5dSChristopher Siden zb1nextL0 = (zb1->zb_blkid + 1) << 3223ad135b5dSChristopher Siden ((zb1->zb_level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)); 3224ad135b5dSChristopher Siden 3225ad135b5dSChristopher Siden zb2thisobj = zb2->zb_object ? zb2->zb_object : 3226ad135b5dSChristopher Siden zb2->zb_blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT); 3227ad135b5dSChristopher Siden 3228ad135b5dSChristopher Siden if (zb1->zb_object == DMU_META_DNODE_OBJECT) { 3229ad135b5dSChristopher Siden uint64_t nextobj = zb1nextL0 * 3230ad135b5dSChristopher Siden (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT) >> DNODE_SHIFT; 3231ad135b5dSChristopher Siden return (nextobj <= zb2thisobj); 3232ad135b5dSChristopher Siden } 3233ad135b5dSChristopher Siden 3234ad135b5dSChristopher Siden if (zb1->zb_object < zb2thisobj) 3235ad135b5dSChristopher Siden return (B_TRUE); 3236ad135b5dSChristopher Siden if (zb1->zb_object > zb2thisobj) 3237ad135b5dSChristopher Siden return (B_FALSE); 3238ad135b5dSChristopher Siden if (zb2->zb_object == DMU_META_DNODE_OBJECT) 3239ad135b5dSChristopher Siden return (B_FALSE); 3240ad135b5dSChristopher Siden return (zb1nextL0 <= zb2->zb_blkid); 3241ad135b5dSChristopher Siden } 3242