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. 23840345f6SGeorge Wilson * Copyright (c) 2012 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> 39fa9e4066Sahrens 40fa9e4066Sahrens /* 41fa9e4066Sahrens * ========================================================================== 42fa9e4066Sahrens * I/O priority table 43fa9e4066Sahrens * ========================================================================== 44fa9e4066Sahrens */ 45fa9e4066Sahrens uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE] = { 46fa9e4066Sahrens 0, /* ZIO_PRIORITY_NOW */ 47fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_READ */ 48fa9e4066Sahrens 0, /* ZIO_PRIORITY_SYNC_WRITE */ 49fa9e4066Sahrens 0, /* ZIO_PRIORITY_LOG_WRITE */ 5080eb36f2SGeorge Wilson 1, /* ZIO_PRIORITY_CACHE_FILL */ 5180eb36f2SGeorge Wilson 1, /* ZIO_PRIORITY_AGG */ 5280eb36f2SGeorge Wilson 4, /* ZIO_PRIORITY_FREE */ 5380eb36f2SGeorge Wilson 4, /* ZIO_PRIORITY_ASYNC_WRITE */ 5480eb36f2SGeorge Wilson 6, /* ZIO_PRIORITY_ASYNC_READ */ 55fa9e4066Sahrens 10, /* ZIO_PRIORITY_RESILVER */ 56fa9e4066Sahrens 20, /* ZIO_PRIORITY_SCRUB */ 57c7cd2421SGeorge Wilson 2, /* ZIO_PRIORITY_DDT_PREFETCH */ 58fa9e4066Sahrens }; 59fa9e4066Sahrens 60fa9e4066Sahrens /* 61fa9e4066Sahrens * ========================================================================== 62fa9e4066Sahrens * I/O type descriptions 63fa9e4066Sahrens * ========================================================================== 64fa9e4066Sahrens */ 65fa9e4066Sahrens char *zio_type_name[ZIO_TYPES] = { 6680eb36f2SGeorge Wilson "zio_null", "zio_read", "zio_write", "zio_free", "zio_claim", 6780eb36f2SGeorge Wilson "zio_ioctl" 6880eb36f2SGeorge Wilson }; 69fa9e4066Sahrens 70fa9e4066Sahrens /* 71fa9e4066Sahrens * ========================================================================== 72fa9e4066Sahrens * I/O kmem caches 73fa9e4066Sahrens * ========================================================================== 74fa9e4066Sahrens */ 75ccae0b50Seschrock kmem_cache_t *zio_cache; 76a3f829aeSBill Moore kmem_cache_t *zio_link_cache; 77fa9e4066Sahrens kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 78ad23a2dbSjohansen kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 79ad23a2dbSjohansen 80ad23a2dbSjohansen #ifdef _KERNEL 81ad23a2dbSjohansen extern vmem_t *zio_alloc_arena; 82ad23a2dbSjohansen #endif 8309c9d376SGeorge Wilson extern int zfs_mg_alloc_failures; 84fa9e4066Sahrens 85*01f55e48SGeorge Wilson /* 86*01f55e48SGeorge Wilson * The following actions directly effect the spa's sync-to-convergence logic. 87*01f55e48SGeorge Wilson * The values below define the sync pass when we start performing the action. 88*01f55e48SGeorge Wilson * Care should be taken when changing these values as they directly impact 89*01f55e48SGeorge Wilson * spa_sync() performance. Tuning these values may introduce subtle performance 90*01f55e48SGeorge Wilson * pathologies and should only be done in the context of performance analysis. 91*01f55e48SGeorge Wilson * These tunables will eventually be removed and replaced with #defines once 92*01f55e48SGeorge Wilson * enough analysis has been done to determine optimal values. 93*01f55e48SGeorge Wilson * 94*01f55e48SGeorge Wilson * The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that 95*01f55e48SGeorge Wilson * regular blocks are not deferred. 96*01f55e48SGeorge Wilson */ 97*01f55e48SGeorge Wilson int zfs_sync_pass_deferred_free = 2; /* defer frees starting in this pass */ 98*01f55e48SGeorge Wilson int zfs_sync_pass_dont_compress = 5; /* don't compress starting in this pass */ 99*01f55e48SGeorge Wilson int zfs_sync_pass_rewrite = 2; /* rewrite new bps starting in this pass */ 100*01f55e48SGeorge Wilson 1010a4e9518Sgw /* 102e14bb325SJeff Bonwick * An allocating zio is one that either currently has the DVA allocate 103e14bb325SJeff Bonwick * stage set or will have it later in its lifetime. 1040a4e9518Sgw */ 105b24ab676SJeff Bonwick #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) 106b24ab676SJeff Bonwick 10735a5a358SJonathan Adams boolean_t zio_requeue_io_start_cut_in_line = B_TRUE; 10835a5a358SJonathan Adams 109b24ab676SJeff Bonwick #ifdef ZFS_DEBUG 110b24ab676SJeff Bonwick int zio_buf_debug_limit = 16384; 111b24ab676SJeff Bonwick #else 112b24ab676SJeff Bonwick int zio_buf_debug_limit = 0; 113b24ab676SJeff Bonwick #endif 1140a4e9518Sgw 115fa9e4066Sahrens void 116fa9e4066Sahrens zio_init(void) 117fa9e4066Sahrens { 118fa9e4066Sahrens size_t c; 119ad23a2dbSjohansen vmem_t *data_alloc_arena = NULL; 120ad23a2dbSjohansen 121ad23a2dbSjohansen #ifdef _KERNEL 122ad23a2dbSjohansen data_alloc_arena = zio_alloc_arena; 123ad23a2dbSjohansen #endif 124a3f829aeSBill Moore zio_cache = kmem_cache_create("zio_cache", 125a3f829aeSBill Moore sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 126a3f829aeSBill Moore zio_link_cache = kmem_cache_create("zio_link_cache", 127a3f829aeSBill Moore sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 128ccae0b50Seschrock 129fa9e4066Sahrens /* 130fa9e4066Sahrens * For small buffers, we want a cache for each multiple of 131fa9e4066Sahrens * SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache 132fa9e4066Sahrens * for each quarter-power of 2. For large buffers, we want 133fa9e4066Sahrens * a cache for each multiple of PAGESIZE. 134fa9e4066Sahrens */ 135fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 136fa9e4066Sahrens size_t size = (c + 1) << SPA_MINBLOCKSHIFT; 137fa9e4066Sahrens size_t p2 = size; 138fa9e4066Sahrens size_t align = 0; 139e291592aSJonathan Adams size_t cflags = (size > zio_buf_debug_limit) ? KMC_NODEBUG : 0; 140fa9e4066Sahrens 141fa9e4066Sahrens while (p2 & (p2 - 1)) 142fa9e4066Sahrens p2 &= p2 - 1; 143fa9e4066Sahrens 144cd1c8b85SMatthew Ahrens #ifndef _KERNEL 145cd1c8b85SMatthew Ahrens /* 146cd1c8b85SMatthew Ahrens * If we are using watchpoints, put each buffer on its own page, 147cd1c8b85SMatthew Ahrens * to eliminate the performance overhead of trapping to the 148cd1c8b85SMatthew Ahrens * kernel when modifying a non-watched buffer that shares the 149cd1c8b85SMatthew Ahrens * page with a watched buffer. 150cd1c8b85SMatthew Ahrens */ 151cd1c8b85SMatthew Ahrens if (arc_watch && !IS_P2ALIGNED(size, PAGESIZE)) 152cd1c8b85SMatthew Ahrens continue; 153cd1c8b85SMatthew Ahrens #endif 154fa9e4066Sahrens if (size <= 4 * SPA_MINBLOCKSIZE) { 155fa9e4066Sahrens align = SPA_MINBLOCKSIZE; 156cd1c8b85SMatthew Ahrens } else if (IS_P2ALIGNED(size, PAGESIZE)) { 157fa9e4066Sahrens align = PAGESIZE; 158cd1c8b85SMatthew Ahrens } else if (IS_P2ALIGNED(size, p2 >> 2)) { 159fa9e4066Sahrens align = p2 >> 2; 160fa9e4066Sahrens } 161fa9e4066Sahrens 162fa9e4066Sahrens if (align != 0) { 163ad23a2dbSjohansen char name[36]; 1645ad82045Snd (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); 165fa9e4066Sahrens zio_buf_cache[c] = kmem_cache_create(name, size, 166e291592aSJonathan Adams align, NULL, NULL, NULL, NULL, NULL, cflags); 167ad23a2dbSjohansen 168e291592aSJonathan Adams /* 169e291592aSJonathan Adams * Since zio_data bufs do not appear in crash dumps, we 170e291592aSJonathan Adams * pass KMC_NOTOUCH so that no allocator metadata is 171e291592aSJonathan Adams * stored with the buffers. 172e291592aSJonathan Adams */ 173ad23a2dbSjohansen (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); 174ad23a2dbSjohansen zio_data_buf_cache[c] = kmem_cache_create(name, size, 175ad23a2dbSjohansen align, NULL, NULL, NULL, NULL, data_alloc_arena, 176e291592aSJonathan Adams cflags | KMC_NOTOUCH); 177fa9e4066Sahrens } 178fa9e4066Sahrens } 179fa9e4066Sahrens 180fa9e4066Sahrens while (--c != 0) { 181fa9e4066Sahrens ASSERT(zio_buf_cache[c] != NULL); 182fa9e4066Sahrens if (zio_buf_cache[c - 1] == NULL) 183fa9e4066Sahrens zio_buf_cache[c - 1] = zio_buf_cache[c]; 184ad23a2dbSjohansen 185ad23a2dbSjohansen ASSERT(zio_data_buf_cache[c] != NULL); 186ad23a2dbSjohansen if (zio_data_buf_cache[c - 1] == NULL) 187ad23a2dbSjohansen zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; 188fa9e4066Sahrens } 189ea8dc4b6Seschrock 19009c9d376SGeorge Wilson /* 19109c9d376SGeorge Wilson * The zio write taskqs have 1 thread per cpu, allow 1/2 of the taskqs 19209c9d376SGeorge Wilson * to fail 3 times per txg or 8 failures, whichever is greater. 19309c9d376SGeorge Wilson */ 19409c9d376SGeorge Wilson zfs_mg_alloc_failures = MAX((3 * max_ncpus / 2), 8); 19509c9d376SGeorge Wilson 196ea8dc4b6Seschrock zio_inject_init(); 197fa9e4066Sahrens } 198fa9e4066Sahrens 199fa9e4066Sahrens void 200fa9e4066Sahrens zio_fini(void) 201fa9e4066Sahrens { 202fa9e4066Sahrens size_t c; 203fa9e4066Sahrens kmem_cache_t *last_cache = NULL; 204ad23a2dbSjohansen kmem_cache_t *last_data_cache = NULL; 205fa9e4066Sahrens 206fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 207fa9e4066Sahrens if (zio_buf_cache[c] != last_cache) { 208fa9e4066Sahrens last_cache = zio_buf_cache[c]; 209fa9e4066Sahrens kmem_cache_destroy(zio_buf_cache[c]); 210fa9e4066Sahrens } 211fa9e4066Sahrens zio_buf_cache[c] = NULL; 212ad23a2dbSjohansen 213ad23a2dbSjohansen if (zio_data_buf_cache[c] != last_data_cache) { 214ad23a2dbSjohansen last_data_cache = zio_data_buf_cache[c]; 215ad23a2dbSjohansen kmem_cache_destroy(zio_data_buf_cache[c]); 216ad23a2dbSjohansen } 217ad23a2dbSjohansen zio_data_buf_cache[c] = NULL; 218fa9e4066Sahrens } 219ea8dc4b6Seschrock 220a3f829aeSBill Moore kmem_cache_destroy(zio_link_cache); 221ccae0b50Seschrock kmem_cache_destroy(zio_cache); 222ccae0b50Seschrock 223ea8dc4b6Seschrock zio_inject_fini(); 224fa9e4066Sahrens } 225fa9e4066Sahrens 226fa9e4066Sahrens /* 227fa9e4066Sahrens * ========================================================================== 228fa9e4066Sahrens * Allocate and free I/O buffers 229fa9e4066Sahrens * ========================================================================== 230fa9e4066Sahrens */ 231ad23a2dbSjohansen 232ad23a2dbSjohansen /* 233ad23a2dbSjohansen * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a 234ad23a2dbSjohansen * crashdump if the kernel panics, so use it judiciously. Obviously, it's 235ad23a2dbSjohansen * useful to inspect ZFS metadata, but if possible, we should avoid keeping 236ad23a2dbSjohansen * excess / transient data in-core during a crashdump. 237ad23a2dbSjohansen */ 238fa9e4066Sahrens void * 239fa9e4066Sahrens zio_buf_alloc(size_t size) 240fa9e4066Sahrens { 241fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 242fa9e4066Sahrens 243fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 244fa9e4066Sahrens 2451ab7f2deSmaybee return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); 246fa9e4066Sahrens } 247fa9e4066Sahrens 248ad23a2dbSjohansen /* 249ad23a2dbSjohansen * Use zio_data_buf_alloc to allocate data. The data will not appear in a 250ad23a2dbSjohansen * crashdump if the kernel panics. This exists so that we will limit the amount 251ad23a2dbSjohansen * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount 252ad23a2dbSjohansen * of kernel heap dumped to disk when the kernel panics) 253ad23a2dbSjohansen */ 254ad23a2dbSjohansen void * 255ad23a2dbSjohansen zio_data_buf_alloc(size_t size) 256ad23a2dbSjohansen { 257ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 258ad23a2dbSjohansen 259ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 260ad23a2dbSjohansen 2611ab7f2deSmaybee return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); 262ad23a2dbSjohansen } 263ad23a2dbSjohansen 264fa9e4066Sahrens void 265fa9e4066Sahrens zio_buf_free(void *buf, size_t size) 266fa9e4066Sahrens { 267fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 268fa9e4066Sahrens 269fa9e4066Sahrens ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 270fa9e4066Sahrens 271fa9e4066Sahrens kmem_cache_free(zio_buf_cache[c], buf); 272fa9e4066Sahrens } 273fa9e4066Sahrens 274ad23a2dbSjohansen void 275ad23a2dbSjohansen zio_data_buf_free(void *buf, size_t size) 276ad23a2dbSjohansen { 277ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 278ad23a2dbSjohansen 279ad23a2dbSjohansen ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 280ad23a2dbSjohansen 281ad23a2dbSjohansen kmem_cache_free(zio_data_buf_cache[c], buf); 282ad23a2dbSjohansen } 283b3995adbSahrens 284fa9e4066Sahrens /* 285fa9e4066Sahrens * ========================================================================== 286fa9e4066Sahrens * Push and pop I/O transform buffers 287fa9e4066Sahrens * ========================================================================== 288fa9e4066Sahrens */ 289fa9e4066Sahrens static void 290e14bb325SJeff Bonwick zio_push_transform(zio_t *zio, void *data, uint64_t size, uint64_t bufsize, 291e14bb325SJeff Bonwick zio_transform_func_t *transform) 292fa9e4066Sahrens { 293fa9e4066Sahrens zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); 294fa9e4066Sahrens 295e14bb325SJeff Bonwick zt->zt_orig_data = zio->io_data; 296e14bb325SJeff Bonwick zt->zt_orig_size = zio->io_size; 297fa9e4066Sahrens zt->zt_bufsize = bufsize; 298e14bb325SJeff Bonwick zt->zt_transform = transform; 299fa9e4066Sahrens 300fa9e4066Sahrens zt->zt_next = zio->io_transform_stack; 301fa9e4066Sahrens zio->io_transform_stack = zt; 302fa9e4066Sahrens 303fa9e4066Sahrens zio->io_data = data; 304fa9e4066Sahrens zio->io_size = size; 305fa9e4066Sahrens } 306fa9e4066Sahrens 307fa9e4066Sahrens static void 308e14bb325SJeff Bonwick zio_pop_transforms(zio_t *zio) 309fa9e4066Sahrens { 310e14bb325SJeff Bonwick zio_transform_t *zt; 311e14bb325SJeff Bonwick 312e14bb325SJeff Bonwick while ((zt = zio->io_transform_stack) != NULL) { 313e14bb325SJeff Bonwick if (zt->zt_transform != NULL) 314e14bb325SJeff Bonwick zt->zt_transform(zio, 315e14bb325SJeff Bonwick zt->zt_orig_data, zt->zt_orig_size); 316fa9e4066Sahrens 317b24ab676SJeff Bonwick if (zt->zt_bufsize != 0) 318b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zt->zt_bufsize); 319fa9e4066Sahrens 320e14bb325SJeff Bonwick zio->io_data = zt->zt_orig_data; 321e14bb325SJeff Bonwick zio->io_size = zt->zt_orig_size; 322e14bb325SJeff Bonwick zio->io_transform_stack = zt->zt_next; 323fa9e4066Sahrens 324e14bb325SJeff Bonwick kmem_free(zt, sizeof (zio_transform_t)); 325fa9e4066Sahrens } 326fa9e4066Sahrens } 327fa9e4066Sahrens 328e14bb325SJeff Bonwick /* 329e14bb325SJeff Bonwick * ========================================================================== 330e14bb325SJeff Bonwick * I/O transform callbacks for subblocks and decompression 331e14bb325SJeff Bonwick * ========================================================================== 332e14bb325SJeff Bonwick */ 333e14bb325SJeff Bonwick static void 334e14bb325SJeff Bonwick zio_subblock(zio_t *zio, void *data, uint64_t size) 335e14bb325SJeff Bonwick { 336e14bb325SJeff Bonwick ASSERT(zio->io_size > size); 337e14bb325SJeff Bonwick 338e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ) 339e14bb325SJeff Bonwick bcopy(zio->io_data, data, size); 340e14bb325SJeff Bonwick } 341e14bb325SJeff Bonwick 342e14bb325SJeff Bonwick static void 343e14bb325SJeff Bonwick zio_decompress(zio_t *zio, void *data, uint64_t size) 344e14bb325SJeff Bonwick { 345e14bb325SJeff Bonwick if (zio->io_error == 0 && 346e14bb325SJeff Bonwick zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), 347b24ab676SJeff Bonwick zio->io_data, data, zio->io_size, size) != 0) 348e14bb325SJeff Bonwick zio->io_error = EIO; 349e14bb325SJeff Bonwick } 350e14bb325SJeff Bonwick 351e14bb325SJeff Bonwick /* 352e14bb325SJeff Bonwick * ========================================================================== 353e14bb325SJeff Bonwick * I/O parent/child relationships and pipeline interlocks 354e14bb325SJeff Bonwick * ========================================================================== 355e14bb325SJeff Bonwick */ 356a3f829aeSBill Moore /* 357a3f829aeSBill Moore * NOTE - Callers to zio_walk_parents() and zio_walk_children must 358a3f829aeSBill Moore * continue calling these functions until they return NULL. 359a3f829aeSBill Moore * Otherwise, the next caller will pick up the list walk in 360a3f829aeSBill Moore * some indeterminate state. (Otherwise every caller would 361a3f829aeSBill Moore * have to pass in a cookie to keep the state represented by 362a3f829aeSBill Moore * io_walk_link, which gets annoying.) 363a3f829aeSBill Moore */ 364a3f829aeSBill Moore zio_t * 365a3f829aeSBill Moore zio_walk_parents(zio_t *cio) 366a3f829aeSBill Moore { 367a3f829aeSBill Moore zio_link_t *zl = cio->io_walk_link; 368a3f829aeSBill Moore list_t *pl = &cio->io_parent_list; 369e14bb325SJeff Bonwick 370a3f829aeSBill Moore zl = (zl == NULL) ? list_head(pl) : list_next(pl, zl); 371a3f829aeSBill Moore cio->io_walk_link = zl; 372a3f829aeSBill Moore 373a3f829aeSBill Moore if (zl == NULL) 374a3f829aeSBill Moore return (NULL); 375a3f829aeSBill Moore 376a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 377a3f829aeSBill Moore return (zl->zl_parent); 378a3f829aeSBill Moore } 379a3f829aeSBill Moore 380a3f829aeSBill Moore zio_t * 381a3f829aeSBill Moore zio_walk_children(zio_t *pio) 382a3f829aeSBill Moore { 383a3f829aeSBill Moore zio_link_t *zl = pio->io_walk_link; 384a3f829aeSBill Moore list_t *cl = &pio->io_child_list; 385a3f829aeSBill Moore 386a3f829aeSBill Moore zl = (zl == NULL) ? list_head(cl) : list_next(cl, zl); 387a3f829aeSBill Moore pio->io_walk_link = zl; 388a3f829aeSBill Moore 389a3f829aeSBill Moore if (zl == NULL) 390a3f829aeSBill Moore return (NULL); 391a3f829aeSBill Moore 392a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 393a3f829aeSBill Moore return (zl->zl_child); 394a3f829aeSBill Moore } 395a3f829aeSBill Moore 396a3f829aeSBill Moore zio_t * 397a3f829aeSBill Moore zio_unique_parent(zio_t *cio) 398a3f829aeSBill Moore { 399a3f829aeSBill Moore zio_t *pio = zio_walk_parents(cio); 400a3f829aeSBill Moore 401a3f829aeSBill Moore VERIFY(zio_walk_parents(cio) == NULL); 402a3f829aeSBill Moore return (pio); 403a3f829aeSBill Moore } 404a3f829aeSBill Moore 405a3f829aeSBill Moore void 406a3f829aeSBill Moore zio_add_child(zio_t *pio, zio_t *cio) 407e14bb325SJeff Bonwick { 408a3f829aeSBill Moore zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); 409a3f829aeSBill Moore 410a3f829aeSBill Moore /* 411a3f829aeSBill Moore * Logical I/Os can have logical, gang, or vdev children. 412a3f829aeSBill Moore * Gang I/Os can have gang or vdev children. 413a3f829aeSBill Moore * Vdev I/Os can only have vdev children. 414a3f829aeSBill Moore * The following ASSERT captures all of these constraints. 415a3f829aeSBill Moore */ 416a3f829aeSBill Moore ASSERT(cio->io_child_type <= pio->io_child_type); 417a3f829aeSBill Moore 418a3f829aeSBill Moore zl->zl_parent = pio; 419a3f829aeSBill Moore zl->zl_child = cio; 420a3f829aeSBill Moore 421a3f829aeSBill Moore mutex_enter(&cio->io_lock); 422e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 423a3f829aeSBill Moore 424a3f829aeSBill Moore ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); 425a3f829aeSBill Moore 426a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 427a3f829aeSBill Moore pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; 428a3f829aeSBill Moore 429a3f829aeSBill Moore list_insert_head(&pio->io_child_list, zl); 430a3f829aeSBill Moore list_insert_head(&cio->io_parent_list, zl); 431a3f829aeSBill Moore 432b24ab676SJeff Bonwick pio->io_child_count++; 433b24ab676SJeff Bonwick cio->io_parent_count++; 434b24ab676SJeff Bonwick 435e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 436a3f829aeSBill Moore mutex_exit(&cio->io_lock); 437e14bb325SJeff Bonwick } 438e14bb325SJeff Bonwick 439fa9e4066Sahrens static void 440a3f829aeSBill Moore zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) 441e14bb325SJeff Bonwick { 442a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 443a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 444e14bb325SJeff Bonwick 445a3f829aeSBill Moore mutex_enter(&cio->io_lock); 446e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 447a3f829aeSBill Moore 448a3f829aeSBill Moore list_remove(&pio->io_child_list, zl); 449a3f829aeSBill Moore list_remove(&cio->io_parent_list, zl); 450a3f829aeSBill Moore 451b24ab676SJeff Bonwick pio->io_child_count--; 452b24ab676SJeff Bonwick cio->io_parent_count--; 453b24ab676SJeff Bonwick 454e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 455a3f829aeSBill Moore mutex_exit(&cio->io_lock); 456a3f829aeSBill Moore 457a3f829aeSBill Moore kmem_cache_free(zio_link_cache, zl); 458e14bb325SJeff Bonwick } 459e14bb325SJeff Bonwick 460e14bb325SJeff Bonwick static boolean_t 461e14bb325SJeff Bonwick zio_wait_for_children(zio_t *zio, enum zio_child child, enum zio_wait_type wait) 462fa9e4066Sahrens { 463e14bb325SJeff Bonwick uint64_t *countp = &zio->io_children[child][wait]; 464e14bb325SJeff Bonwick boolean_t waiting = B_FALSE; 465e14bb325SJeff Bonwick 466e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 467e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 468e14bb325SJeff Bonwick if (*countp != 0) { 469b24ab676SJeff Bonwick zio->io_stage >>= 1; 470e14bb325SJeff Bonwick zio->io_stall = countp; 471e14bb325SJeff Bonwick waiting = B_TRUE; 472e14bb325SJeff Bonwick } 473e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 474e14bb325SJeff Bonwick 475e14bb325SJeff Bonwick return (waiting); 476e14bb325SJeff Bonwick } 477fa9e4066Sahrens 478e14bb325SJeff Bonwick static void 479e14bb325SJeff Bonwick zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) 480e14bb325SJeff Bonwick { 481e14bb325SJeff Bonwick uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; 482e14bb325SJeff Bonwick int *errorp = &pio->io_child_error[zio->io_child_type]; 483fa9e4066Sahrens 484e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 485e14bb325SJeff Bonwick if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 486e14bb325SJeff Bonwick *errorp = zio_worst_error(*errorp, zio->io_error); 487e14bb325SJeff Bonwick pio->io_reexecute |= zio->io_reexecute; 488e14bb325SJeff Bonwick ASSERT3U(*countp, >, 0); 489e14bb325SJeff Bonwick if (--*countp == 0 && pio->io_stall == countp) { 490e14bb325SJeff Bonwick pio->io_stall = NULL; 491e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 492e14bb325SJeff Bonwick zio_execute(pio); 493e14bb325SJeff Bonwick } else { 494e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 495fa9e4066Sahrens } 496fa9e4066Sahrens } 497fa9e4066Sahrens 498e14bb325SJeff Bonwick static void 499e14bb325SJeff Bonwick zio_inherit_child_errors(zio_t *zio, enum zio_child c) 500e14bb325SJeff Bonwick { 501e14bb325SJeff Bonwick if (zio->io_child_error[c] != 0 && zio->io_error == 0) 502e14bb325SJeff Bonwick zio->io_error = zio->io_child_error[c]; 503e14bb325SJeff Bonwick } 504e14bb325SJeff Bonwick 505fa9e4066Sahrens /* 506fa9e4066Sahrens * ========================================================================== 507e14bb325SJeff Bonwick * Create the various types of I/O (read, write, free, etc) 508fa9e4066Sahrens * ========================================================================== 509fa9e4066Sahrens */ 510fa9e4066Sahrens static zio_t * 511b24ab676SJeff Bonwick zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 512fa9e4066Sahrens void *data, uint64_t size, zio_done_func_t *done, void *private, 513b24ab676SJeff Bonwick zio_type_t type, int priority, enum zio_flag flags, 514b24ab676SJeff Bonwick vdev_t *vd, uint64_t offset, const zbookmark_t *zb, 515b24ab676SJeff Bonwick enum zio_stage stage, enum zio_stage pipeline) 516fa9e4066Sahrens { 517fa9e4066Sahrens zio_t *zio; 518fa9e4066Sahrens 519fa9e4066Sahrens ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); 520fa9e4066Sahrens ASSERT(P2PHASE(size, SPA_MINBLOCKSIZE) == 0); 521e14bb325SJeff Bonwick ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); 522fa9e4066Sahrens 523e14bb325SJeff Bonwick ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); 524e14bb325SJeff Bonwick ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); 525e14bb325SJeff Bonwick ASSERT(vd || stage == ZIO_STAGE_OPEN); 526088f3894Sahrens 527ccae0b50Seschrock zio = kmem_cache_alloc(zio_cache, KM_SLEEP); 528ccae0b50Seschrock bzero(zio, sizeof (zio_t)); 529e14bb325SJeff Bonwick 530e14bb325SJeff Bonwick mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); 531e14bb325SJeff Bonwick cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); 532e14bb325SJeff Bonwick 533a3f829aeSBill Moore list_create(&zio->io_parent_list, sizeof (zio_link_t), 534a3f829aeSBill Moore offsetof(zio_link_t, zl_parent_node)); 535a3f829aeSBill Moore list_create(&zio->io_child_list, sizeof (zio_link_t), 536a3f829aeSBill Moore offsetof(zio_link_t, zl_child_node)); 537a3f829aeSBill Moore 538e14bb325SJeff Bonwick if (vd != NULL) 539e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_VDEV; 540e14bb325SJeff Bonwick else if (flags & ZIO_FLAG_GANG_CHILD) 541e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_GANG; 542b24ab676SJeff Bonwick else if (flags & ZIO_FLAG_DDT_CHILD) 543b24ab676SJeff Bonwick zio->io_child_type = ZIO_CHILD_DDT; 544e14bb325SJeff Bonwick else 545e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_LOGICAL; 546e14bb325SJeff Bonwick 547fa9e4066Sahrens if (bp != NULL) { 548b24ab676SJeff Bonwick zio->io_bp = (blkptr_t *)bp; 549fa9e4066Sahrens zio->io_bp_copy = *bp; 550fa9e4066Sahrens zio->io_bp_orig = *bp; 551b24ab676SJeff Bonwick if (type != ZIO_TYPE_WRITE || 552b24ab676SJeff Bonwick zio->io_child_type == ZIO_CHILD_DDT) 553e14bb325SJeff Bonwick zio->io_bp = &zio->io_bp_copy; /* so caller can free */ 554f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL) 555e14bb325SJeff Bonwick zio->io_logical = zio; 556f5383399SBill Moore if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) 557f5383399SBill Moore pipeline |= ZIO_GANG_STAGES; 558fa9e4066Sahrens } 559e14bb325SJeff Bonwick 560e14bb325SJeff Bonwick zio->io_spa = spa; 561e14bb325SJeff Bonwick zio->io_txg = txg; 562fa9e4066Sahrens zio->io_done = done; 563fa9e4066Sahrens zio->io_private = private; 564fa9e4066Sahrens zio->io_type = type; 565fa9e4066Sahrens zio->io_priority = priority; 566e14bb325SJeff Bonwick zio->io_vd = vd; 567e14bb325SJeff Bonwick zio->io_offset = offset; 568b24ab676SJeff Bonwick zio->io_orig_data = zio->io_data = data; 569b24ab676SJeff Bonwick zio->io_orig_size = zio->io_size = size; 570e14bb325SJeff Bonwick zio->io_orig_flags = zio->io_flags = flags; 571e14bb325SJeff Bonwick zio->io_orig_stage = zio->io_stage = stage; 572e14bb325SJeff Bonwick zio->io_orig_pipeline = zio->io_pipeline = pipeline; 573fa9e4066Sahrens 574a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); 575a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); 576a3f829aeSBill Moore 577e14bb325SJeff Bonwick if (zb != NULL) 578e14bb325SJeff Bonwick zio->io_bookmark = *zb; 579e14bb325SJeff Bonwick 580e14bb325SJeff Bonwick if (pio != NULL) { 581e14bb325SJeff Bonwick if (zio->io_logical == NULL) 582ea8dc4b6Seschrock zio->io_logical = pio->io_logical; 583f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_GANG) 584f5383399SBill Moore zio->io_gang_leader = pio->io_gang_leader; 585e14bb325SJeff Bonwick zio_add_child(pio, zio); 586fa9e4066Sahrens } 587fa9e4066Sahrens 588fa9e4066Sahrens return (zio); 589fa9e4066Sahrens } 590fa9e4066Sahrens 5910a4e9518Sgw static void 592e14bb325SJeff Bonwick zio_destroy(zio_t *zio) 5930a4e9518Sgw { 594a3f829aeSBill Moore list_destroy(&zio->io_parent_list); 595a3f829aeSBill Moore list_destroy(&zio->io_child_list); 596e14bb325SJeff Bonwick mutex_destroy(&zio->io_lock); 597e14bb325SJeff Bonwick cv_destroy(&zio->io_cv); 598e14bb325SJeff Bonwick kmem_cache_free(zio_cache, zio); 5990a4e9518Sgw } 6000a4e9518Sgw 601fa9e4066Sahrens zio_t * 602a3f829aeSBill Moore zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, 603b24ab676SJeff Bonwick void *private, enum zio_flag flags) 604fa9e4066Sahrens { 605fa9e4066Sahrens zio_t *zio; 606fa9e4066Sahrens 607fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 608a3f829aeSBill Moore ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 609e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); 610fa9e4066Sahrens 611fa9e4066Sahrens return (zio); 612fa9e4066Sahrens } 613fa9e4066Sahrens 614fa9e4066Sahrens zio_t * 615b24ab676SJeff Bonwick zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) 616fa9e4066Sahrens { 617a3f829aeSBill Moore return (zio_null(NULL, spa, NULL, done, private, flags)); 618fa9e4066Sahrens } 619fa9e4066Sahrens 620fa9e4066Sahrens zio_t * 621e14bb325SJeff Bonwick zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 622e14bb325SJeff Bonwick void *data, uint64_t size, zio_done_func_t *done, void *private, 623b24ab676SJeff Bonwick int priority, enum zio_flag flags, const zbookmark_t *zb) 624fa9e4066Sahrens { 625fa9e4066Sahrens zio_t *zio; 626fa9e4066Sahrens 627b24ab676SJeff Bonwick zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, 628088f3894Sahrens data, size, done, private, 629e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, NULL, 0, zb, 630b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 631b24ab676SJeff Bonwick ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); 632fa9e4066Sahrens 633fa9e4066Sahrens return (zio); 634fa9e4066Sahrens } 635fa9e4066Sahrens 636fa9e4066Sahrens zio_t * 637e14bb325SJeff Bonwick zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 638b24ab676SJeff Bonwick void *data, uint64_t size, const zio_prop_t *zp, 639e14bb325SJeff Bonwick zio_done_func_t *ready, zio_done_func_t *done, void *private, 640b24ab676SJeff Bonwick int priority, enum zio_flag flags, const zbookmark_t *zb) 641fa9e4066Sahrens { 642fa9e4066Sahrens zio_t *zio; 643fa9e4066Sahrens 644e14bb325SJeff Bonwick ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && 645e14bb325SJeff Bonwick zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && 646e14bb325SJeff Bonwick zp->zp_compress >= ZIO_COMPRESS_OFF && 647e14bb325SJeff Bonwick zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && 648ad135b5dSChristopher Siden DMU_OT_IS_VALID(zp->zp_type) && 649e14bb325SJeff Bonwick zp->zp_level < 32 && 650b24ab676SJeff Bonwick zp->zp_copies > 0 && 651b24ab676SJeff Bonwick zp->zp_copies <= spa_max_replication(spa) && 652b24ab676SJeff Bonwick zp->zp_dedup <= 1 && 653b24ab676SJeff Bonwick zp->zp_dedup_verify <= 1); 6540a4e9518Sgw 655fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 656e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 657b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 658b24ab676SJeff Bonwick ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); 659fa9e4066Sahrens 660c717a561Smaybee zio->io_ready = ready; 661e14bb325SJeff Bonwick zio->io_prop = *zp; 662fa9e4066Sahrens 663fa9e4066Sahrens return (zio); 664fa9e4066Sahrens } 665fa9e4066Sahrens 666fa9e4066Sahrens zio_t * 667e14bb325SJeff Bonwick zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, void *data, 668e14bb325SJeff Bonwick uint64_t size, zio_done_func_t *done, void *private, int priority, 669b24ab676SJeff Bonwick enum zio_flag flags, zbookmark_t *zb) 670fa9e4066Sahrens { 671fa9e4066Sahrens zio_t *zio; 672fa9e4066Sahrens 673fa9e4066Sahrens zio = zio_create(pio, spa, txg, bp, data, size, done, private, 674e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 675e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); 676fa9e4066Sahrens 677fa9e4066Sahrens return (zio); 678fa9e4066Sahrens } 679fa9e4066Sahrens 680b24ab676SJeff Bonwick void 681b24ab676SJeff Bonwick zio_write_override(zio_t *zio, blkptr_t *bp, int copies) 682b24ab676SJeff Bonwick { 683b24ab676SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 684b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 685b24ab676SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 686b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); 687b24ab676SJeff Bonwick 688b24ab676SJeff Bonwick zio->io_prop.zp_copies = copies; 689b24ab676SJeff Bonwick zio->io_bp_override = bp; 690b24ab676SJeff Bonwick } 691b24ab676SJeff Bonwick 692b24ab676SJeff Bonwick void 693b24ab676SJeff Bonwick zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) 694b24ab676SJeff Bonwick { 695cde58dbcSMatthew Ahrens bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp); 696b24ab676SJeff Bonwick } 697b24ab676SJeff Bonwick 698fa9e4066Sahrens zio_t * 699b24ab676SJeff Bonwick zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 700b24ab676SJeff Bonwick enum zio_flag flags) 701fa9e4066Sahrens { 702fa9e4066Sahrens zio_t *zio; 703fa9e4066Sahrens 7043f9d6ad7SLin Ling dprintf_bp(bp, "freeing in txg %llu, pass %u", 7053f9d6ad7SLin Ling (longlong_t)txg, spa->spa_sync_pass); 7063f9d6ad7SLin Ling 707fa9e4066Sahrens ASSERT(!BP_IS_HOLE(bp)); 708b24ab676SJeff Bonwick ASSERT(spa_syncing_txg(spa) == txg); 709*01f55e48SGeorge Wilson ASSERT(spa_sync_pass(spa) < zfs_sync_pass_deferred_free); 710fa9e4066Sahrens 711e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 712b24ab676SJeff Bonwick NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_FREE, flags, 713e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_FREE_PIPELINE); 714fa9e4066Sahrens 715fa9e4066Sahrens return (zio); 716fa9e4066Sahrens } 717fa9e4066Sahrens 718fa9e4066Sahrens zio_t * 719b24ab676SJeff Bonwick zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 720b24ab676SJeff Bonwick zio_done_func_t *done, void *private, enum zio_flag flags) 721fa9e4066Sahrens { 722fa9e4066Sahrens zio_t *zio; 723fa9e4066Sahrens 724fa9e4066Sahrens /* 725fa9e4066Sahrens * A claim is an allocation of a specific block. Claims are needed 726fa9e4066Sahrens * to support immediate writes in the intent log. The issue is that 727fa9e4066Sahrens * immediate writes contain committed data, but in a txg that was 728fa9e4066Sahrens * *not* committed. Upon opening the pool after an unclean shutdown, 729fa9e4066Sahrens * the intent log claims all blocks that contain immediate write data 730fa9e4066Sahrens * so that the SPA knows they're in use. 731fa9e4066Sahrens * 732fa9e4066Sahrens * All claims *must* be resolved in the first txg -- before the SPA 733fa9e4066Sahrens * starts allocating blocks -- so that nothing is allocated twice. 734b24ab676SJeff Bonwick * If txg == 0 we just verify that the block is claimable. 735fa9e4066Sahrens */ 736fa9e4066Sahrens ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, spa_first_txg(spa)); 737b24ab676SJeff Bonwick ASSERT(txg == spa_first_txg(spa) || txg == 0); 738b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ 739fa9e4066Sahrens 740e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 741e14bb325SJeff Bonwick done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, flags, 742e14bb325SJeff Bonwick NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); 743fa9e4066Sahrens 744fa9e4066Sahrens return (zio); 745fa9e4066Sahrens } 746fa9e4066Sahrens 747fa9e4066Sahrens zio_t * 748fa9e4066Sahrens zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 749b24ab676SJeff Bonwick zio_done_func_t *done, void *private, int priority, enum zio_flag flags) 750fa9e4066Sahrens { 751fa9e4066Sahrens zio_t *zio; 752fa9e4066Sahrens int c; 753fa9e4066Sahrens 754fa9e4066Sahrens if (vd->vdev_children == 0) { 755fa9e4066Sahrens zio = zio_create(pio, spa, 0, NULL, NULL, 0, done, private, 756e14bb325SJeff Bonwick ZIO_TYPE_IOCTL, priority, flags, vd, 0, NULL, 757fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); 758fa9e4066Sahrens 759fa9e4066Sahrens zio->io_cmd = cmd; 760fa9e4066Sahrens } else { 761a3f829aeSBill Moore zio = zio_null(pio, spa, NULL, NULL, NULL, flags); 762fa9e4066Sahrens 763fa9e4066Sahrens for (c = 0; c < vd->vdev_children; c++) 764fa9e4066Sahrens zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, 765fa9e4066Sahrens done, private, priority, flags)); 766fa9e4066Sahrens } 767fa9e4066Sahrens 768fa9e4066Sahrens return (zio); 769fa9e4066Sahrens } 770fa9e4066Sahrens 771fa9e4066Sahrens zio_t * 772fa9e4066Sahrens zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 773fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 774b24ab676SJeff Bonwick int priority, enum zio_flag flags, boolean_t labels) 775fa9e4066Sahrens { 776fa9e4066Sahrens zio_t *zio; 7770a4e9518Sgw 778e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 779e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 780e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 781e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 782fa9e4066Sahrens 783e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 784e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, vd, offset, NULL, 785fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); 786fa9e4066Sahrens 787e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 788fa9e4066Sahrens 789fa9e4066Sahrens return (zio); 790fa9e4066Sahrens } 791fa9e4066Sahrens 792fa9e4066Sahrens zio_t * 793fa9e4066Sahrens zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 794fa9e4066Sahrens void *data, int checksum, zio_done_func_t *done, void *private, 795b24ab676SJeff Bonwick int priority, enum zio_flag flags, boolean_t labels) 796fa9e4066Sahrens { 797fa9e4066Sahrens zio_t *zio; 7980a4e9518Sgw 799e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 800e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 801e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 802e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 803fa9e4066Sahrens 804e14bb325SJeff Bonwick zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, done, private, 805e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, vd, offset, NULL, 806fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); 807fa9e4066Sahrens 808e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 809fa9e4066Sahrens 8106e1f5caaSNeil Perrin if (zio_checksum_table[checksum].ci_eck) { 811fa9e4066Sahrens /* 8126e1f5caaSNeil Perrin * zec checksums are necessarily destructive -- they modify 813e14bb325SJeff Bonwick * the end of the write buffer to hold the verifier/checksum. 814fa9e4066Sahrens * Therefore, we must make a local copy in case the data is 815e14bb325SJeff Bonwick * being written to multiple places in parallel. 816fa9e4066Sahrens */ 817e14bb325SJeff Bonwick void *wbuf = zio_buf_alloc(size); 818fa9e4066Sahrens bcopy(data, wbuf, size); 819e14bb325SJeff Bonwick zio_push_transform(zio, wbuf, size, size, NULL); 820fa9e4066Sahrens } 821fa9e4066Sahrens 822fa9e4066Sahrens return (zio); 823fa9e4066Sahrens } 824fa9e4066Sahrens 825fa9e4066Sahrens /* 826e14bb325SJeff Bonwick * Create a child I/O to do some work for us. 827fa9e4066Sahrens */ 828fa9e4066Sahrens zio_t * 829e14bb325SJeff Bonwick zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, 830b24ab676SJeff Bonwick void *data, uint64_t size, int type, int priority, enum zio_flag flags, 831fa9e4066Sahrens zio_done_func_t *done, void *private) 832fa9e4066Sahrens { 833b24ab676SJeff Bonwick enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; 834e14bb325SJeff Bonwick zio_t *zio; 835e14bb325SJeff Bonwick 836e14bb325SJeff Bonwick ASSERT(vd->vdev_parent == 837e14bb325SJeff Bonwick (pio->io_vd ? pio->io_vd : pio->io_spa->spa_root_vdev)); 838fa9e4066Sahrens 839fa9e4066Sahrens if (type == ZIO_TYPE_READ && bp != NULL) { 840fa9e4066Sahrens /* 841fa9e4066Sahrens * If we have the bp, then the child should perform the 842fa9e4066Sahrens * checksum and the parent need not. This pushes error 843fa9e4066Sahrens * detection as close to the leaves as possible and 844fa9e4066Sahrens * eliminates redundant checksums in the interior nodes. 845fa9e4066Sahrens */ 846b24ab676SJeff Bonwick pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; 847b24ab676SJeff Bonwick pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 848fa9e4066Sahrens } 849fa9e4066Sahrens 850e14bb325SJeff Bonwick if (vd->vdev_children == 0) 851e14bb325SJeff Bonwick offset += VDEV_LABEL_START_SIZE; 852e14bb325SJeff Bonwick 853b24ab676SJeff Bonwick flags |= ZIO_VDEV_CHILD_FLAGS(pio) | ZIO_FLAG_DONT_PROPAGATE; 854b24ab676SJeff Bonwick 855b24ab676SJeff Bonwick /* 856b24ab676SJeff Bonwick * If we've decided to do a repair, the write is not speculative -- 857b24ab676SJeff Bonwick * even if the original read was. 858b24ab676SJeff Bonwick */ 859b24ab676SJeff Bonwick if (flags & ZIO_FLAG_IO_REPAIR) 860b24ab676SJeff Bonwick flags &= ~ZIO_FLAG_SPECULATIVE; 861b24ab676SJeff Bonwick 862e14bb325SJeff Bonwick zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, 863b24ab676SJeff Bonwick done, private, type, priority, flags, vd, offset, &pio->io_bookmark, 864b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, pipeline); 865fa9e4066Sahrens 866e14bb325SJeff Bonwick return (zio); 86732b87932Sek } 86832b87932Sek 869e14bb325SJeff Bonwick zio_t * 870e14bb325SJeff Bonwick zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, void *data, uint64_t size, 871b24ab676SJeff Bonwick int type, int priority, enum zio_flag flags, 872b24ab676SJeff Bonwick zio_done_func_t *done, void *private) 873fa9e4066Sahrens { 874e14bb325SJeff Bonwick zio_t *zio; 875fa9e4066Sahrens 876e14bb325SJeff Bonwick ASSERT(vd->vdev_ops->vdev_op_leaf); 877fa9e4066Sahrens 878e14bb325SJeff Bonwick zio = zio_create(NULL, vd->vdev_spa, 0, NULL, 879e14bb325SJeff Bonwick data, size, done, private, type, priority, 880e14bb325SJeff Bonwick flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY, 881e14bb325SJeff Bonwick vd, offset, NULL, 882b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); 883fa9e4066Sahrens 884e14bb325SJeff Bonwick return (zio); 885e05725b1Sbonwick } 886e05725b1Sbonwick 887e05725b1Sbonwick void 888e14bb325SJeff Bonwick zio_flush(zio_t *zio, vdev_t *vd) 889e05725b1Sbonwick { 890e14bb325SJeff Bonwick zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, 891e14bb325SJeff Bonwick NULL, NULL, ZIO_PRIORITY_NOW, 892e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); 893fa9e4066Sahrens } 894fa9e4066Sahrens 8956e1f5caaSNeil Perrin void 8966e1f5caaSNeil Perrin zio_shrink(zio_t *zio, uint64_t size) 8976e1f5caaSNeil Perrin { 8986e1f5caaSNeil Perrin ASSERT(zio->io_executor == NULL); 8996e1f5caaSNeil Perrin ASSERT(zio->io_orig_size == zio->io_size); 9006e1f5caaSNeil Perrin ASSERT(size <= zio->io_size); 9016e1f5caaSNeil Perrin 9026e1f5caaSNeil Perrin /* 9036e1f5caaSNeil Perrin * We don't shrink for raidz because of problems with the 9046e1f5caaSNeil Perrin * reconstruction when reading back less than the block size. 9056e1f5caaSNeil Perrin * Note, BP_IS_RAIDZ() assumes no compression. 9066e1f5caaSNeil Perrin */ 9076e1f5caaSNeil Perrin ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); 9086e1f5caaSNeil Perrin if (!BP_IS_RAIDZ(zio->io_bp)) 9096e1f5caaSNeil Perrin zio->io_orig_size = zio->io_size = size; 9106e1f5caaSNeil Perrin } 9116e1f5caaSNeil Perrin 912fa9e4066Sahrens /* 913fa9e4066Sahrens * ========================================================================== 914e14bb325SJeff Bonwick * Prepare to read and write logical blocks 915fa9e4066Sahrens * ========================================================================== 916fa9e4066Sahrens */ 917e14bb325SJeff Bonwick 918e05725b1Sbonwick static int 919e14bb325SJeff Bonwick zio_read_bp_init(zio_t *zio) 920fa9e4066Sahrens { 921e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 922e05725b1Sbonwick 92303361682SJeff Bonwick if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && 924f5383399SBill Moore zio->io_child_type == ZIO_CHILD_LOGICAL && 925f5383399SBill Moore !(zio->io_flags & ZIO_FLAG_RAW)) { 926b24ab676SJeff Bonwick uint64_t psize = BP_GET_PSIZE(bp); 927b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(psize); 928e05725b1Sbonwick 929b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, psize, zio_decompress); 930e14bb325SJeff Bonwick } 931fa9e4066Sahrens 932ad135b5dSChristopher Siden if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) && BP_GET_LEVEL(bp) == 0) 933e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 934fa9e4066Sahrens 935bbfd46c4SJeff Bonwick if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) 936bbfd46c4SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 937bbfd46c4SJeff Bonwick 938b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) 939b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_READ_PIPELINE; 940b24ab676SJeff Bonwick 941e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 942fa9e4066Sahrens } 943fa9e4066Sahrens 944e05725b1Sbonwick static int 945e14bb325SJeff Bonwick zio_write_bp_init(zio_t *zio) 9460a4e9518Sgw { 947b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 948e14bb325SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 949b24ab676SJeff Bonwick enum zio_compress compress = zp->zp_compress; 950e05725b1Sbonwick blkptr_t *bp = zio->io_bp; 951e14bb325SJeff Bonwick uint64_t lsize = zio->io_size; 952b24ab676SJeff Bonwick uint64_t psize = lsize; 953e14bb325SJeff Bonwick int pass = 1; 954e05725b1Sbonwick 955e14bb325SJeff Bonwick /* 956e14bb325SJeff Bonwick * If our children haven't all reached the ready stage, 957e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 958e14bb325SJeff Bonwick */ 959e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 960e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_READY)) 961e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 9620a4e9518Sgw 963e14bb325SJeff Bonwick if (!IO_IS_ALLOCATING(zio)) 964e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 9650a4e9518Sgw 966b24ab676SJeff Bonwick ASSERT(zio->io_child_type != ZIO_CHILD_DDT); 967b24ab676SJeff Bonwick 968b24ab676SJeff Bonwick if (zio->io_bp_override) { 969b24ab676SJeff Bonwick ASSERT(bp->blk_birth != zio->io_txg); 970b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); 971b24ab676SJeff Bonwick 972b24ab676SJeff Bonwick *bp = *zio->io_bp_override; 973b24ab676SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 974b24ab676SJeff Bonwick 975b24ab676SJeff Bonwick if (BP_IS_HOLE(bp) || !zp->zp_dedup) 976b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 977b24ab676SJeff Bonwick 978b24ab676SJeff Bonwick ASSERT(zio_checksum_table[zp->zp_checksum].ci_dedup || 979b24ab676SJeff Bonwick zp->zp_dedup_verify); 980b24ab676SJeff Bonwick 981b24ab676SJeff Bonwick if (BP_GET_CHECKSUM(bp) == zp->zp_checksum) { 982b24ab676SJeff Bonwick BP_SET_DEDUP(bp, 1); 983b24ab676SJeff Bonwick zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; 984b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 985b24ab676SJeff Bonwick } 986b24ab676SJeff Bonwick zio->io_bp_override = NULL; 987b24ab676SJeff Bonwick BP_ZERO(bp); 988b24ab676SJeff Bonwick } 9890a4e9518Sgw 990e14bb325SJeff Bonwick if (bp->blk_birth == zio->io_txg) { 991e14bb325SJeff Bonwick /* 992e14bb325SJeff Bonwick * We're rewriting an existing block, which means we're 993e14bb325SJeff Bonwick * working on behalf of spa_sync(). For spa_sync() to 994e14bb325SJeff Bonwick * converge, it must eventually be the case that we don't 995e14bb325SJeff Bonwick * have to allocate new blocks. But compression changes 996e14bb325SJeff Bonwick * the blocksize, which forces a reallocate, and makes 997e14bb325SJeff Bonwick * convergence take longer. Therefore, after the first 998e14bb325SJeff Bonwick * few passes, stop compressing to ensure convergence. 999e14bb325SJeff Bonwick */ 1000b24ab676SJeff Bonwick pass = spa_sync_pass(spa); 1001b24ab676SJeff Bonwick 1002b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(spa)); 1003b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1004b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp)); 1005e05725b1Sbonwick 1006*01f55e48SGeorge Wilson if (pass >= zfs_sync_pass_dont_compress) 1007e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 1008e05725b1Sbonwick 1009e14bb325SJeff Bonwick /* Make sure someone doesn't change their mind on overwrites */ 1010b24ab676SJeff Bonwick ASSERT(MIN(zp->zp_copies + BP_IS_GANG(bp), 1011b24ab676SJeff Bonwick spa_max_replication(spa)) == BP_GET_NDVAS(bp)); 1012e14bb325SJeff Bonwick } 1013fa9e4066Sahrens 1014e14bb325SJeff Bonwick if (compress != ZIO_COMPRESS_OFF) { 1015b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(lsize); 1016b24ab676SJeff Bonwick psize = zio_compress_data(compress, zio->io_data, cbuf, lsize); 1017b24ab676SJeff Bonwick if (psize == 0 || psize == lsize) { 1018e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 1019b24ab676SJeff Bonwick zio_buf_free(cbuf, lsize); 1020b24ab676SJeff Bonwick } else { 1021b24ab676SJeff Bonwick ASSERT(psize < lsize); 1022b24ab676SJeff Bonwick zio_push_transform(zio, cbuf, psize, lsize, NULL); 1023e14bb325SJeff Bonwick } 1024e14bb325SJeff Bonwick } 1025c717a561Smaybee 1026e14bb325SJeff Bonwick /* 1027e14bb325SJeff Bonwick * The final pass of spa_sync() must be all rewrites, but the first 1028e14bb325SJeff Bonwick * few passes offer a trade-off: allocating blocks defers convergence, 1029e14bb325SJeff Bonwick * but newly allocated blocks are sequential, so they can be written 1030e14bb325SJeff Bonwick * to disk faster. Therefore, we allow the first few passes of 1031e14bb325SJeff Bonwick * spa_sync() to allocate new blocks, but force rewrites after that. 1032e14bb325SJeff Bonwick * There should only be a handful of blocks after pass 1 in any case. 1033e14bb325SJeff Bonwick */ 1034b24ab676SJeff Bonwick if (bp->blk_birth == zio->io_txg && BP_GET_PSIZE(bp) == psize && 1035*01f55e48SGeorge Wilson pass >= zfs_sync_pass_rewrite) { 1036b24ab676SJeff Bonwick ASSERT(psize != 0); 1037b24ab676SJeff Bonwick enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; 1038e14bb325SJeff Bonwick zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; 1039e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_REWRITE; 1040e14bb325SJeff Bonwick } else { 1041e14bb325SJeff Bonwick BP_ZERO(bp); 1042e14bb325SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 1043e14bb325SJeff Bonwick } 1044fa9e4066Sahrens 1045b24ab676SJeff Bonwick if (psize == 0) { 1046e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1047e14bb325SJeff Bonwick } else { 1048e14bb325SJeff Bonwick ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); 1049e14bb325SJeff Bonwick BP_SET_LSIZE(bp, lsize); 1050b24ab676SJeff Bonwick BP_SET_PSIZE(bp, psize); 1051e14bb325SJeff Bonwick BP_SET_COMPRESS(bp, compress); 1052e14bb325SJeff Bonwick BP_SET_CHECKSUM(bp, zp->zp_checksum); 1053e14bb325SJeff Bonwick BP_SET_TYPE(bp, zp->zp_type); 1054e14bb325SJeff Bonwick BP_SET_LEVEL(bp, zp->zp_level); 1055b24ab676SJeff Bonwick BP_SET_DEDUP(bp, zp->zp_dedup); 1056e14bb325SJeff Bonwick BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 1057b24ab676SJeff Bonwick if (zp->zp_dedup) { 1058b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1059b24ab676SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 1060b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; 1061b24ab676SJeff Bonwick } 1062b24ab676SJeff Bonwick } 1063b24ab676SJeff Bonwick 1064b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1065b24ab676SJeff Bonwick } 1066b24ab676SJeff Bonwick 1067b24ab676SJeff Bonwick static int 1068b24ab676SJeff Bonwick zio_free_bp_init(zio_t *zio) 1069b24ab676SJeff Bonwick { 1070b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1071b24ab676SJeff Bonwick 1072b24ab676SJeff Bonwick if (zio->io_child_type == ZIO_CHILD_LOGICAL) { 1073b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp)) 1074b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; 1075e14bb325SJeff Bonwick } 1076fa9e4066Sahrens 1077e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1078fa9e4066Sahrens } 1079fa9e4066Sahrens 1080e14bb325SJeff Bonwick /* 1081e14bb325SJeff Bonwick * ========================================================================== 1082e14bb325SJeff Bonwick * Execute the I/O pipeline 1083e14bb325SJeff Bonwick * ========================================================================== 1084e14bb325SJeff Bonwick */ 1085e14bb325SJeff Bonwick 1086e14bb325SJeff Bonwick static void 108735a5a358SJonathan Adams zio_taskq_dispatch(zio_t *zio, enum zio_taskq_type q, boolean_t cutinline) 1088fa9e4066Sahrens { 108980eb36f2SGeorge Wilson spa_t *spa = zio->io_spa; 1090e14bb325SJeff Bonwick zio_type_t t = zio->io_type; 10915aeb9474SGarrett D'Amore int flags = (cutinline ? TQ_FRONT : 0); 10920a4e9518Sgw 10930a4e9518Sgw /* 1094bbe36defSGeorge Wilson * If we're a config writer or a probe, the normal issue and 1095bbe36defSGeorge Wilson * interrupt threads may all be blocked waiting for the config lock. 1096bbe36defSGeorge Wilson * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. 10970a4e9518Sgw */ 1098bbe36defSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) 1099e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 11000a4e9518Sgw 11010a4e9518Sgw /* 1102e14bb325SJeff Bonwick * A similar issue exists for the L2ARC write thread until L2ARC 2.0. 11030a4e9518Sgw */ 1104e14bb325SJeff Bonwick if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) 1105e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 11060a4e9518Sgw 110780eb36f2SGeorge Wilson /* 110880eb36f2SGeorge Wilson * If this is a high priority I/O, then use the high priority taskq. 110980eb36f2SGeorge Wilson */ 111080eb36f2SGeorge Wilson if (zio->io_priority == ZIO_PRIORITY_NOW && 111180eb36f2SGeorge Wilson spa->spa_zio_taskq[t][q + 1] != NULL) 111280eb36f2SGeorge Wilson q++; 111380eb36f2SGeorge Wilson 111480eb36f2SGeorge Wilson ASSERT3U(q, <, ZIO_TASKQ_TYPES); 11155aeb9474SGarrett D'Amore 11165aeb9474SGarrett D'Amore /* 11175aeb9474SGarrett D'Amore * NB: We are assuming that the zio can only be dispatched 11185aeb9474SGarrett D'Amore * to a single taskq at a time. It would be a grievous error 11195aeb9474SGarrett D'Amore * to dispatch the zio to another taskq at the same time. 11205aeb9474SGarrett D'Amore */ 11215aeb9474SGarrett D'Amore ASSERT(zio->io_tqent.tqent_next == NULL); 11225aeb9474SGarrett D'Amore taskq_dispatch_ent(spa->spa_zio_taskq[t][q], 11235aeb9474SGarrett D'Amore (task_func_t *)zio_execute, zio, flags, &zio->io_tqent); 1124e14bb325SJeff Bonwick } 11250a4e9518Sgw 1126e14bb325SJeff Bonwick static boolean_t 1127e14bb325SJeff Bonwick zio_taskq_member(zio_t *zio, enum zio_taskq_type q) 1128e14bb325SJeff Bonwick { 1129e14bb325SJeff Bonwick kthread_t *executor = zio->io_executor; 1130e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 11310a4e9518Sgw 1132e14bb325SJeff Bonwick for (zio_type_t t = 0; t < ZIO_TYPES; t++) 1133e14bb325SJeff Bonwick if (taskq_member(spa->spa_zio_taskq[t][q], executor)) 1134e14bb325SJeff Bonwick return (B_TRUE); 11350a4e9518Sgw 1136e14bb325SJeff Bonwick return (B_FALSE); 1137e14bb325SJeff Bonwick } 1138e05725b1Sbonwick 1139e14bb325SJeff Bonwick static int 1140e14bb325SJeff Bonwick zio_issue_async(zio_t *zio) 1141e14bb325SJeff Bonwick { 114235a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 1143e14bb325SJeff Bonwick 1144e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 11450a4e9518Sgw } 11460a4e9518Sgw 1147e14bb325SJeff Bonwick void 1148e14bb325SJeff Bonwick zio_interrupt(zio_t *zio) 11490a4e9518Sgw { 115035a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE); 1151e14bb325SJeff Bonwick } 11520a4e9518Sgw 1153e14bb325SJeff Bonwick /* 1154e14bb325SJeff Bonwick * Execute the I/O pipeline until one of the following occurs: 1155e14bb325SJeff Bonwick * (1) the I/O completes; (2) the pipeline stalls waiting for 1156e14bb325SJeff Bonwick * dependent child I/Os; (3) the I/O issues, so we're waiting 1157e14bb325SJeff Bonwick * for an I/O completion interrupt; (4) the I/O is delegated by 1158e14bb325SJeff Bonwick * vdev-level caching or aggregation; (5) the I/O is deferred 1159e14bb325SJeff Bonwick * due to vdev-level queueing; (6) the I/O is handed off to 1160e14bb325SJeff Bonwick * another thread. In all cases, the pipeline stops whenever 1161e14bb325SJeff Bonwick * there's no CPU work; it never burns a thread in cv_wait(). 1162e14bb325SJeff Bonwick * 1163e14bb325SJeff Bonwick * There's no locking on io_stage because there's no legitimate way 1164e14bb325SJeff Bonwick * for multiple threads to be attempting to process the same I/O. 1165e14bb325SJeff Bonwick */ 1166b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[]; 11670a4e9518Sgw 1168e14bb325SJeff Bonwick void 1169e14bb325SJeff Bonwick zio_execute(zio_t *zio) 1170e14bb325SJeff Bonwick { 1171e14bb325SJeff Bonwick zio->io_executor = curthread; 11720a4e9518Sgw 1173e14bb325SJeff Bonwick while (zio->io_stage < ZIO_STAGE_DONE) { 1174b24ab676SJeff Bonwick enum zio_stage pipeline = zio->io_pipeline; 1175b24ab676SJeff Bonwick enum zio_stage stage = zio->io_stage; 1176e14bb325SJeff Bonwick int rv; 11770a4e9518Sgw 1178e14bb325SJeff Bonwick ASSERT(!MUTEX_HELD(&zio->io_lock)); 1179b24ab676SJeff Bonwick ASSERT(ISP2(stage)); 1180b24ab676SJeff Bonwick ASSERT(zio->io_stall == NULL); 11810a4e9518Sgw 1182b24ab676SJeff Bonwick do { 1183b24ab676SJeff Bonwick stage <<= 1; 1184b24ab676SJeff Bonwick } while ((stage & pipeline) == 0); 1185e14bb325SJeff Bonwick 1186e14bb325SJeff Bonwick ASSERT(stage <= ZIO_STAGE_DONE); 11870a4e9518Sgw 11880a4e9518Sgw /* 1189e14bb325SJeff Bonwick * If we are in interrupt context and this pipeline stage 1190e14bb325SJeff Bonwick * will grab a config lock that is held across I/O, 1191b24ab676SJeff Bonwick * or may wait for an I/O that needs an interrupt thread 1192b24ab676SJeff Bonwick * to complete, issue async to avoid deadlock. 119335a5a358SJonathan Adams * 119435a5a358SJonathan Adams * For VDEV_IO_START, we cut in line so that the io will 119535a5a358SJonathan Adams * be sent to disk promptly. 11960a4e9518Sgw */ 1197b24ab676SJeff Bonwick if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && 1198e14bb325SJeff Bonwick zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { 119935a5a358SJonathan Adams boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ? 120035a5a358SJonathan Adams zio_requeue_io_start_cut_in_line : B_FALSE; 120135a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); 1202e14bb325SJeff Bonwick return; 12030a4e9518Sgw } 12040a4e9518Sgw 1205e14bb325SJeff Bonwick zio->io_stage = stage; 1206b24ab676SJeff Bonwick rv = zio_pipeline[highbit(stage) - 1](zio); 12070a4e9518Sgw 1208e14bb325SJeff Bonwick if (rv == ZIO_PIPELINE_STOP) 1209e14bb325SJeff Bonwick return; 12100a4e9518Sgw 1211e14bb325SJeff Bonwick ASSERT(rv == ZIO_PIPELINE_CONTINUE); 1212e14bb325SJeff Bonwick } 12130a4e9518Sgw } 12140a4e9518Sgw 1215e14bb325SJeff Bonwick /* 1216e14bb325SJeff Bonwick * ========================================================================== 1217e14bb325SJeff Bonwick * Initiate I/O, either sync or async 1218e14bb325SJeff Bonwick * ========================================================================== 1219e14bb325SJeff Bonwick */ 1220e14bb325SJeff Bonwick int 1221e14bb325SJeff Bonwick zio_wait(zio_t *zio) 12220a4e9518Sgw { 1223e14bb325SJeff Bonwick int error; 12240a4e9518Sgw 1225e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 1226e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 12270a4e9518Sgw 1228e14bb325SJeff Bonwick zio->io_waiter = curthread; 1229e05725b1Sbonwick 1230e14bb325SJeff Bonwick zio_execute(zio); 12310a4e9518Sgw 1232e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 1233e14bb325SJeff Bonwick while (zio->io_executor != NULL) 1234e14bb325SJeff Bonwick cv_wait(&zio->io_cv, &zio->io_lock); 1235e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 123632b87932Sek 1237e14bb325SJeff Bonwick error = zio->io_error; 1238e14bb325SJeff Bonwick zio_destroy(zio); 123932b87932Sek 1240e14bb325SJeff Bonwick return (error); 124132b87932Sek } 124232b87932Sek 1243e14bb325SJeff Bonwick void 1244e14bb325SJeff Bonwick zio_nowait(zio_t *zio) 12450a4e9518Sgw { 1246e14bb325SJeff Bonwick ASSERT(zio->io_executor == NULL); 1247fa9e4066Sahrens 1248a3f829aeSBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL && 1249a3f829aeSBill Moore zio_unique_parent(zio) == NULL) { 1250ea8dc4b6Seschrock /* 1251e14bb325SJeff Bonwick * This is a logical async I/O with no parent to wait for it. 125254d692b7SGeorge Wilson * We add it to the spa_async_root_zio "Godfather" I/O which 125354d692b7SGeorge Wilson * will ensure they complete prior to unloading the pool. 1254ea8dc4b6Seschrock */ 1255e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 125654d692b7SGeorge Wilson 125754d692b7SGeorge Wilson zio_add_child(spa->spa_async_zio_root, zio); 1258e14bb325SJeff Bonwick } 1259ea8dc4b6Seschrock 1260e14bb325SJeff Bonwick zio_execute(zio); 1261e14bb325SJeff Bonwick } 1262ea8dc4b6Seschrock 1263e14bb325SJeff Bonwick /* 1264e14bb325SJeff Bonwick * ========================================================================== 1265e14bb325SJeff Bonwick * Reexecute or suspend/resume failed I/O 1266e14bb325SJeff Bonwick * ========================================================================== 1267e14bb325SJeff Bonwick */ 1268fa9e4066Sahrens 1269e14bb325SJeff Bonwick static void 1270e14bb325SJeff Bonwick zio_reexecute(zio_t *pio) 1271e14bb325SJeff Bonwick { 1272a3f829aeSBill Moore zio_t *cio, *cio_next; 1273a3f829aeSBill Moore 1274a3f829aeSBill Moore ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); 1275a3f829aeSBill Moore ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); 1276f5383399SBill Moore ASSERT(pio->io_gang_leader == NULL); 1277f5383399SBill Moore ASSERT(pio->io_gang_tree == NULL); 1278e05725b1Sbonwick 1279e14bb325SJeff Bonwick pio->io_flags = pio->io_orig_flags; 1280e14bb325SJeff Bonwick pio->io_stage = pio->io_orig_stage; 1281e14bb325SJeff Bonwick pio->io_pipeline = pio->io_orig_pipeline; 1282e14bb325SJeff Bonwick pio->io_reexecute = 0; 1283e14bb325SJeff Bonwick pio->io_error = 0; 1284a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1285a3f829aeSBill Moore pio->io_state[w] = 0; 1286e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 1287e14bb325SJeff Bonwick pio->io_child_error[c] = 0; 12880a4e9518Sgw 1289b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(pio)) 1290b24ab676SJeff Bonwick BP_ZERO(pio->io_bp); 1291d58459f4Sek 1292e14bb325SJeff Bonwick /* 1293e14bb325SJeff Bonwick * As we reexecute pio's children, new children could be created. 1294a3f829aeSBill Moore * New children go to the head of pio's io_child_list, however, 1295e14bb325SJeff Bonwick * so we will (correctly) not reexecute them. The key is that 1296a3f829aeSBill Moore * the remainder of pio's io_child_list, from 'cio_next' onward, 1297a3f829aeSBill Moore * cannot be affected by any side effects of reexecuting 'cio'. 1298e14bb325SJeff Bonwick */ 1299a3f829aeSBill Moore for (cio = zio_walk_children(pio); cio != NULL; cio = cio_next) { 1300a3f829aeSBill Moore cio_next = zio_walk_children(pio); 1301e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 1302a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1303a3f829aeSBill Moore pio->io_children[cio->io_child_type][w]++; 1304e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 1305a3f829aeSBill Moore zio_reexecute(cio); 1306fa9e4066Sahrens } 1307e05725b1Sbonwick 1308e14bb325SJeff Bonwick /* 1309e14bb325SJeff Bonwick * Now that all children have been reexecuted, execute the parent. 131054d692b7SGeorge Wilson * We don't reexecute "The Godfather" I/O here as it's the 131154d692b7SGeorge Wilson * responsibility of the caller to wait on him. 1312e14bb325SJeff Bonwick */ 131354d692b7SGeorge Wilson if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) 131454d692b7SGeorge Wilson zio_execute(pio); 13150a4e9518Sgw } 13160a4e9518Sgw 1317e14bb325SJeff Bonwick void 1318e14bb325SJeff Bonwick zio_suspend(spa_t *spa, zio_t *zio) 13190a4e9518Sgw { 1320e14bb325SJeff Bonwick if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) 1321e14bb325SJeff Bonwick fm_panic("Pool '%s' has encountered an uncorrectable I/O " 1322e14bb325SJeff Bonwick "failure and the failure mode property for this pool " 1323e14bb325SJeff Bonwick "is set to panic.", spa_name(spa)); 13240a4e9518Sgw 1325e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); 13260a4e9518Sgw 1327e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1328fa9e4066Sahrens 1329e14bb325SJeff Bonwick if (spa->spa_suspend_zio_root == NULL) 133054d692b7SGeorge Wilson spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, 133154d692b7SGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 133254d692b7SGeorge Wilson ZIO_FLAG_GODFATHER); 1333fa9e4066Sahrens 1334e14bb325SJeff Bonwick spa->spa_suspended = B_TRUE; 1335fa9e4066Sahrens 1336e14bb325SJeff Bonwick if (zio != NULL) { 133754d692b7SGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 1338e14bb325SJeff Bonwick ASSERT(zio != spa->spa_suspend_zio_root); 1339e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1340a3f829aeSBill Moore ASSERT(zio_unique_parent(zio) == NULL); 1341e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_DONE); 1342e14bb325SJeff Bonwick zio_add_child(spa->spa_suspend_zio_root, zio); 1343e14bb325SJeff Bonwick } 1344fa9e4066Sahrens 1345e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1346e14bb325SJeff Bonwick } 1347fa9e4066Sahrens 134854d692b7SGeorge Wilson int 1349e14bb325SJeff Bonwick zio_resume(spa_t *spa) 1350e14bb325SJeff Bonwick { 135154d692b7SGeorge Wilson zio_t *pio; 1352fa9e4066Sahrens 1353b3995adbSahrens /* 1354e14bb325SJeff Bonwick * Reexecute all previously suspended i/o. 1355b3995adbSahrens */ 1356e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1357e14bb325SJeff Bonwick spa->spa_suspended = B_FALSE; 1358e14bb325SJeff Bonwick cv_broadcast(&spa->spa_suspend_cv); 1359e14bb325SJeff Bonwick pio = spa->spa_suspend_zio_root; 1360e14bb325SJeff Bonwick spa->spa_suspend_zio_root = NULL; 1361e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1362e14bb325SJeff Bonwick 1363e14bb325SJeff Bonwick if (pio == NULL) 136454d692b7SGeorge Wilson return (0); 1365e14bb325SJeff Bonwick 136654d692b7SGeorge Wilson zio_reexecute(pio); 136754d692b7SGeorge Wilson return (zio_wait(pio)); 1368e14bb325SJeff Bonwick } 1369e14bb325SJeff Bonwick 1370e14bb325SJeff Bonwick void 1371e14bb325SJeff Bonwick zio_resume_wait(spa_t *spa) 1372e14bb325SJeff Bonwick { 1373e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1374e14bb325SJeff Bonwick while (spa_suspended(spa)) 1375e14bb325SJeff Bonwick cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); 1376e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1377fa9e4066Sahrens } 1378fa9e4066Sahrens 1379fa9e4066Sahrens /* 1380fa9e4066Sahrens * ========================================================================== 1381e14bb325SJeff Bonwick * Gang blocks. 1382e14bb325SJeff Bonwick * 1383e14bb325SJeff Bonwick * A gang block is a collection of small blocks that looks to the DMU 1384e14bb325SJeff Bonwick * like one large block. When zio_dva_allocate() cannot find a block 1385e14bb325SJeff Bonwick * of the requested size, due to either severe fragmentation or the pool 1386e14bb325SJeff Bonwick * being nearly full, it calls zio_write_gang_block() to construct the 1387e14bb325SJeff Bonwick * block from smaller fragments. 1388e14bb325SJeff Bonwick * 1389e14bb325SJeff Bonwick * A gang block consists of a gang header (zio_gbh_phys_t) and up to 1390e14bb325SJeff Bonwick * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like 1391e14bb325SJeff Bonwick * an indirect block: it's an array of block pointers. It consumes 1392e14bb325SJeff Bonwick * only one sector and hence is allocatable regardless of fragmentation. 1393e14bb325SJeff Bonwick * The gang header's bps point to its gang members, which hold the data. 1394e14bb325SJeff Bonwick * 1395e14bb325SJeff Bonwick * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> 1396e14bb325SJeff Bonwick * as the verifier to ensure uniqueness of the SHA256 checksum. 1397e14bb325SJeff Bonwick * Critically, the gang block bp's blk_cksum is the checksum of the data, 1398e14bb325SJeff Bonwick * not the gang header. This ensures that data block signatures (needed for 1399e14bb325SJeff Bonwick * deduplication) are independent of how the block is physically stored. 1400e14bb325SJeff Bonwick * 1401e14bb325SJeff Bonwick * Gang blocks can be nested: a gang member may itself be a gang block. 1402e14bb325SJeff Bonwick * Thus every gang block is a tree in which root and all interior nodes are 1403e14bb325SJeff Bonwick * gang headers, and the leaves are normal blocks that contain user data. 1404e14bb325SJeff Bonwick * The root of the gang tree is called the gang leader. 1405e14bb325SJeff Bonwick * 1406e14bb325SJeff Bonwick * To perform any operation (read, rewrite, free, claim) on a gang block, 1407e14bb325SJeff Bonwick * zio_gang_assemble() first assembles the gang tree (minus data leaves) 1408e14bb325SJeff Bonwick * in the io_gang_tree field of the original logical i/o by recursively 1409e14bb325SJeff Bonwick * reading the gang leader and all gang headers below it. This yields 1410e14bb325SJeff Bonwick * an in-core tree containing the contents of every gang header and the 1411e14bb325SJeff Bonwick * bps for every constituent of the gang block. 1412e14bb325SJeff Bonwick * 1413e14bb325SJeff Bonwick * With the gang tree now assembled, zio_gang_issue() just walks the gang tree 1414e14bb325SJeff Bonwick * and invokes a callback on each bp. To free a gang block, zio_gang_issue() 1415e14bb325SJeff Bonwick * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. 1416e14bb325SJeff Bonwick * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). 1417e14bb325SJeff Bonwick * zio_read_gang() is a wrapper around zio_read() that omits reading gang 1418e14bb325SJeff Bonwick * headers, since we already have those in io_gang_tree. zio_rewrite_gang() 1419e14bb325SJeff Bonwick * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() 1420e14bb325SJeff Bonwick * of the gang header plus zio_checksum_compute() of the data to update the 1421e14bb325SJeff Bonwick * gang header's blk_cksum as described above. 1422e14bb325SJeff Bonwick * 1423e14bb325SJeff Bonwick * The two-phase assemble/issue model solves the problem of partial failure -- 1424e14bb325SJeff Bonwick * what if you'd freed part of a gang block but then couldn't read the 1425e14bb325SJeff Bonwick * gang header for another part? Assembling the entire gang tree first 1426e14bb325SJeff Bonwick * ensures that all the necessary gang header I/O has succeeded before 1427e14bb325SJeff Bonwick * starting the actual work of free, claim, or write. Once the gang tree 1428e14bb325SJeff Bonwick * is assembled, free and claim are in-memory operations that cannot fail. 1429e14bb325SJeff Bonwick * 1430e14bb325SJeff Bonwick * In the event that a gang write fails, zio_dva_unallocate() walks the 1431e14bb325SJeff Bonwick * gang tree to immediately free (i.e. insert back into the space map) 1432e14bb325SJeff Bonwick * everything we've allocated. This ensures that we don't get ENOSPC 1433e14bb325SJeff Bonwick * errors during repeated suspend/resume cycles due to a flaky device. 1434e14bb325SJeff Bonwick * 1435e14bb325SJeff Bonwick * Gang rewrites only happen during sync-to-convergence. If we can't assemble 1436e14bb325SJeff Bonwick * the gang tree, we won't modify the block, so we can safely defer the free 1437e14bb325SJeff Bonwick * (knowing that the block is still intact). If we *can* assemble the gang 1438e14bb325SJeff Bonwick * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free 1439e14bb325SJeff Bonwick * each constituent bp and we can allocate a new block on the next sync pass. 1440e14bb325SJeff Bonwick * 1441e14bb325SJeff Bonwick * In all cases, the gang tree allows complete recovery from partial failure. 1442fa9e4066Sahrens * ========================================================================== 1443fa9e4066Sahrens */ 1444e14bb325SJeff Bonwick 1445e14bb325SJeff Bonwick static zio_t * 1446e14bb325SJeff Bonwick zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1447fa9e4066Sahrens { 1448e14bb325SJeff Bonwick if (gn != NULL) 1449e14bb325SJeff Bonwick return (pio); 1450fa9e4066Sahrens 1451e14bb325SJeff Bonwick return (zio_read(pio, pio->io_spa, bp, data, BP_GET_PSIZE(bp), 1452e14bb325SJeff Bonwick NULL, NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1453e14bb325SJeff Bonwick &pio->io_bookmark)); 1454e14bb325SJeff Bonwick } 1455e14bb325SJeff Bonwick 1456e14bb325SJeff Bonwick zio_t * 1457e14bb325SJeff Bonwick zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1458e14bb325SJeff Bonwick { 1459e14bb325SJeff Bonwick zio_t *zio; 1460e14bb325SJeff Bonwick 1461e14bb325SJeff Bonwick if (gn != NULL) { 1462e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1463e14bb325SJeff Bonwick gn->gn_gbh, SPA_GANGBLOCKSIZE, NULL, NULL, pio->io_priority, 1464e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1465fa9e4066Sahrens /* 1466e14bb325SJeff Bonwick * As we rewrite each gang header, the pipeline will compute 1467e14bb325SJeff Bonwick * a new gang block header checksum for it; but no one will 1468e14bb325SJeff Bonwick * compute a new data checksum, so we do that here. The one 1469e14bb325SJeff Bonwick * exception is the gang leader: the pipeline already computed 1470e14bb325SJeff Bonwick * its data checksum because that stage precedes gang assembly. 1471e14bb325SJeff Bonwick * (Presently, nothing actually uses interior data checksums; 1472e14bb325SJeff Bonwick * this is just good hygiene.) 1473fa9e4066Sahrens */ 1474f5383399SBill Moore if (gn != pio->io_gang_leader->io_gang_tree) { 1475e14bb325SJeff Bonwick zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), 1476e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp)); 1477e14bb325SJeff Bonwick } 1478b24ab676SJeff Bonwick /* 1479b24ab676SJeff Bonwick * If we are here to damage data for testing purposes, 1480b24ab676SJeff Bonwick * leave the GBH alone so that we can detect the damage. 1481b24ab676SJeff Bonwick */ 1482b24ab676SJeff Bonwick if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) 1483b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 1484fa9e4066Sahrens } else { 1485e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1486e14bb325SJeff Bonwick data, BP_GET_PSIZE(bp), NULL, NULL, pio->io_priority, 1487e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1488fa9e4066Sahrens } 1489fa9e4066Sahrens 1490e14bb325SJeff Bonwick return (zio); 1491e14bb325SJeff Bonwick } 1492fa9e4066Sahrens 1493e14bb325SJeff Bonwick /* ARGSUSED */ 1494e14bb325SJeff Bonwick zio_t * 1495e14bb325SJeff Bonwick zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1496e14bb325SJeff Bonwick { 1497b24ab676SJeff Bonwick return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, 1498b24ab676SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio))); 1499fa9e4066Sahrens } 1500fa9e4066Sahrens 1501e14bb325SJeff Bonwick /* ARGSUSED */ 1502e14bb325SJeff Bonwick zio_t * 1503e14bb325SJeff Bonwick zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, void *data) 1504fa9e4066Sahrens { 1505e14bb325SJeff Bonwick return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, 1506e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 1507e14bb325SJeff Bonwick } 1508fa9e4066Sahrens 1509e14bb325SJeff Bonwick static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { 1510e14bb325SJeff Bonwick NULL, 1511e14bb325SJeff Bonwick zio_read_gang, 1512e14bb325SJeff Bonwick zio_rewrite_gang, 1513e14bb325SJeff Bonwick zio_free_gang, 1514e14bb325SJeff Bonwick zio_claim_gang, 1515e14bb325SJeff Bonwick NULL 1516e14bb325SJeff Bonwick }; 1517fa9e4066Sahrens 1518e14bb325SJeff Bonwick static void zio_gang_tree_assemble_done(zio_t *zio); 1519fa9e4066Sahrens 1520e14bb325SJeff Bonwick static zio_gang_node_t * 1521e14bb325SJeff Bonwick zio_gang_node_alloc(zio_gang_node_t **gnpp) 1522e14bb325SJeff Bonwick { 1523e14bb325SJeff Bonwick zio_gang_node_t *gn; 1524fa9e4066Sahrens 1525e14bb325SJeff Bonwick ASSERT(*gnpp == NULL); 1526fa9e4066Sahrens 1527e14bb325SJeff Bonwick gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); 1528e14bb325SJeff Bonwick gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); 1529e14bb325SJeff Bonwick *gnpp = gn; 1530e14bb325SJeff Bonwick 1531e14bb325SJeff Bonwick return (gn); 1532fa9e4066Sahrens } 1533fa9e4066Sahrens 1534fa9e4066Sahrens static void 1535e14bb325SJeff Bonwick zio_gang_node_free(zio_gang_node_t **gnpp) 1536fa9e4066Sahrens { 1537e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1538fa9e4066Sahrens 1539e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1540e14bb325SJeff Bonwick ASSERT(gn->gn_child[g] == NULL); 1541e14bb325SJeff Bonwick 1542e14bb325SJeff Bonwick zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); 1543e14bb325SJeff Bonwick kmem_free(gn, sizeof (*gn)); 1544e14bb325SJeff Bonwick *gnpp = NULL; 1545fa9e4066Sahrens } 1546fa9e4066Sahrens 1547e14bb325SJeff Bonwick static void 1548e14bb325SJeff Bonwick zio_gang_tree_free(zio_gang_node_t **gnpp) 1549fa9e4066Sahrens { 1550e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 1551fa9e4066Sahrens 1552e14bb325SJeff Bonwick if (gn == NULL) 1553e14bb325SJeff Bonwick return; 1554fa9e4066Sahrens 1555e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 1556e14bb325SJeff Bonwick zio_gang_tree_free(&gn->gn_child[g]); 1557fa9e4066Sahrens 1558e14bb325SJeff Bonwick zio_gang_node_free(gnpp); 1559fa9e4066Sahrens } 1560fa9e4066Sahrens 1561e14bb325SJeff Bonwick static void 1562f5383399SBill Moore zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) 1563fa9e4066Sahrens { 1564e14bb325SJeff Bonwick zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); 1565e14bb325SJeff Bonwick 1566f5383399SBill Moore ASSERT(gio->io_gang_leader == gio); 1567e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp)); 1568fa9e4066Sahrens 1569f5383399SBill Moore zio_nowait(zio_read(gio, gio->io_spa, bp, gn->gn_gbh, 1570e14bb325SJeff Bonwick SPA_GANGBLOCKSIZE, zio_gang_tree_assemble_done, gn, 1571f5383399SBill Moore gio->io_priority, ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); 1572e14bb325SJeff Bonwick } 1573fa9e4066Sahrens 1574e14bb325SJeff Bonwick static void 1575e14bb325SJeff Bonwick zio_gang_tree_assemble_done(zio_t *zio) 1576e14bb325SJeff Bonwick { 1577f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 1578e14bb325SJeff Bonwick zio_gang_node_t *gn = zio->io_private; 1579e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1580fa9e4066Sahrens 1581f5383399SBill Moore ASSERT(gio == zio_unique_parent(zio)); 1582b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 1583fa9e4066Sahrens 1584e14bb325SJeff Bonwick if (zio->io_error) 1585e14bb325SJeff Bonwick return; 1586fa9e4066Sahrens 1587e14bb325SJeff Bonwick if (BP_SHOULD_BYTESWAP(bp)) 1588e14bb325SJeff Bonwick byteswap_uint64_array(zio->io_data, zio->io_size); 1589fa9e4066Sahrens 1590e14bb325SJeff Bonwick ASSERT(zio->io_data == gn->gn_gbh); 1591e14bb325SJeff Bonwick ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); 15926e1f5caaSNeil Perrin ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); 1593e05725b1Sbonwick 1594e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1595e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1596e14bb325SJeff Bonwick if (!BP_IS_GANG(gbp)) 1597e14bb325SJeff Bonwick continue; 1598f5383399SBill Moore zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); 1599e14bb325SJeff Bonwick } 1600fa9e4066Sahrens } 1601fa9e4066Sahrens 1602e14bb325SJeff Bonwick static void 1603e14bb325SJeff Bonwick zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, void *data) 1604fa9e4066Sahrens { 1605f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1606e14bb325SJeff Bonwick zio_t *zio; 1607fa9e4066Sahrens 1608e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) == !!gn); 1609f5383399SBill Moore ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); 1610f5383399SBill Moore ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); 1611fa9e4066Sahrens 1612e14bb325SJeff Bonwick /* 1613e14bb325SJeff Bonwick * If you're a gang header, your data is in gn->gn_gbh. 1614e14bb325SJeff Bonwick * If you're a gang member, your data is in 'data' and gn == NULL. 1615e14bb325SJeff Bonwick */ 1616f5383399SBill Moore zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data); 1617fa9e4066Sahrens 1618e14bb325SJeff Bonwick if (gn != NULL) { 16196e1f5caaSNeil Perrin ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); 1620fa9e4066Sahrens 1621e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 1622e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 1623e14bb325SJeff Bonwick if (BP_IS_HOLE(gbp)) 1624e14bb325SJeff Bonwick continue; 1625e14bb325SJeff Bonwick zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data); 1626e14bb325SJeff Bonwick data = (char *)data + BP_GET_PSIZE(gbp); 1627e14bb325SJeff Bonwick } 1628fa9e4066Sahrens } 1629fa9e4066Sahrens 1630f5383399SBill Moore if (gn == gio->io_gang_tree) 1631f5383399SBill Moore ASSERT3P((char *)gio->io_data + gio->io_size, ==, data); 1632e05725b1Sbonwick 1633e14bb325SJeff Bonwick if (zio != pio) 1634e14bb325SJeff Bonwick zio_nowait(zio); 1635fa9e4066Sahrens } 1636fa9e4066Sahrens 1637e05725b1Sbonwick static int 1638e14bb325SJeff Bonwick zio_gang_assemble(zio_t *zio) 1639fa9e4066Sahrens { 1640e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1641fa9e4066Sahrens 1642f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); 1643f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1644f5383399SBill Moore 1645f5383399SBill Moore zio->io_gang_leader = zio; 1646fa9e4066Sahrens 1647e14bb325SJeff Bonwick zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); 1648e05725b1Sbonwick 1649e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1650fa9e4066Sahrens } 1651fa9e4066Sahrens 1652e05725b1Sbonwick static int 1653e14bb325SJeff Bonwick zio_gang_issue(zio_t *zio) 1654fa9e4066Sahrens { 1655e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1656fa9e4066Sahrens 1657e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE)) 1658e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 1659fa9e4066Sahrens 1660f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); 1661f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 1662fa9e4066Sahrens 1663e14bb325SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_GANG] == 0) 1664f5383399SBill Moore zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_data); 1665e14bb325SJeff Bonwick else 1666f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 1667fa9e4066Sahrens 1668e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1669e05725b1Sbonwick 1670e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1671fa9e4066Sahrens } 1672fa9e4066Sahrens 1673fa9e4066Sahrens static void 1674e14bb325SJeff Bonwick zio_write_gang_member_ready(zio_t *zio) 1675fa9e4066Sahrens { 1676a3f829aeSBill Moore zio_t *pio = zio_unique_parent(zio); 1677f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 167844cd46caSbillm dva_t *cdva = zio->io_bp->blk_dva; 167944cd46caSbillm dva_t *pdva = pio->io_bp->blk_dva; 1680fa9e4066Sahrens uint64_t asize; 1681fa9e4066Sahrens 1682e14bb325SJeff Bonwick if (BP_IS_HOLE(zio->io_bp)) 1683e14bb325SJeff Bonwick return; 1684e14bb325SJeff Bonwick 1685e14bb325SJeff Bonwick ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); 1686e14bb325SJeff Bonwick 1687e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_GANG); 1688b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); 1689b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); 1690b24ab676SJeff Bonwick ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); 169144cd46caSbillm ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); 1692fa9e4066Sahrens 1693fa9e4066Sahrens mutex_enter(&pio->io_lock); 1694e14bb325SJeff Bonwick for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { 169544cd46caSbillm ASSERT(DVA_GET_GANG(&pdva[d])); 169644cd46caSbillm asize = DVA_GET_ASIZE(&pdva[d]); 169744cd46caSbillm asize += DVA_GET_ASIZE(&cdva[d]); 169844cd46caSbillm DVA_SET_ASIZE(&pdva[d], asize); 169944cd46caSbillm } 1700fa9e4066Sahrens mutex_exit(&pio->io_lock); 1701fa9e4066Sahrens } 1702fa9e4066Sahrens 17030a4e9518Sgw static int 1704e14bb325SJeff Bonwick zio_write_gang_block(zio_t *pio) 1705fa9e4066Sahrens { 1706e14bb325SJeff Bonwick spa_t *spa = pio->io_spa; 1707e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 1708f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 1709e14bb325SJeff Bonwick zio_t *zio; 1710e14bb325SJeff Bonwick zio_gang_node_t *gn, **gnpp; 1711fa9e4066Sahrens zio_gbh_phys_t *gbh; 1712e14bb325SJeff Bonwick uint64_t txg = pio->io_txg; 1713e14bb325SJeff Bonwick uint64_t resid = pio->io_size; 1714e14bb325SJeff Bonwick uint64_t lsize; 1715b24ab676SJeff Bonwick int copies = gio->io_prop.zp_copies; 1716b24ab676SJeff Bonwick int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); 1717e14bb325SJeff Bonwick zio_prop_t zp; 1718fa9e4066Sahrens int error; 1719fa9e4066Sahrens 1720b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), SPA_GANGBLOCKSIZE, 1721b24ab676SJeff Bonwick bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, 1722e14bb325SJeff Bonwick METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER); 1723e05725b1Sbonwick if (error) { 1724e14bb325SJeff Bonwick pio->io_error = error; 1725e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1726e05725b1Sbonwick } 1727fa9e4066Sahrens 1728f5383399SBill Moore if (pio == gio) { 1729f5383399SBill Moore gnpp = &gio->io_gang_tree; 1730e14bb325SJeff Bonwick } else { 1731e14bb325SJeff Bonwick gnpp = pio->io_private; 1732e14bb325SJeff Bonwick ASSERT(pio->io_ready == zio_write_gang_member_ready); 1733fa9e4066Sahrens } 1734fa9e4066Sahrens 1735e14bb325SJeff Bonwick gn = zio_gang_node_alloc(gnpp); 1736e14bb325SJeff Bonwick gbh = gn->gn_gbh; 1737e14bb325SJeff Bonwick bzero(gbh, SPA_GANGBLOCKSIZE); 1738fa9e4066Sahrens 1739e14bb325SJeff Bonwick /* 1740e14bb325SJeff Bonwick * Create the gang header. 1741e14bb325SJeff Bonwick */ 1742e14bb325SJeff Bonwick zio = zio_rewrite(pio, spa, txg, bp, gbh, SPA_GANGBLOCKSIZE, NULL, NULL, 1743e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1744fa9e4066Sahrens 1745e14bb325SJeff Bonwick /* 1746e14bb325SJeff Bonwick * Create and nowait the gang children. 1747e14bb325SJeff Bonwick */ 1748e14bb325SJeff Bonwick for (int g = 0; resid != 0; resid -= lsize, g++) { 1749e14bb325SJeff Bonwick lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), 1750e14bb325SJeff Bonwick SPA_MINBLOCKSIZE); 1751e14bb325SJeff Bonwick ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); 1752e14bb325SJeff Bonwick 1753f5383399SBill Moore zp.zp_checksum = gio->io_prop.zp_checksum; 1754e14bb325SJeff Bonwick zp.zp_compress = ZIO_COMPRESS_OFF; 1755e14bb325SJeff Bonwick zp.zp_type = DMU_OT_NONE; 1756e14bb325SJeff Bonwick zp.zp_level = 0; 1757b24ab676SJeff Bonwick zp.zp_copies = gio->io_prop.zp_copies; 1758b24ab676SJeff Bonwick zp.zp_dedup = 0; 1759b24ab676SJeff Bonwick zp.zp_dedup_verify = 0; 1760e14bb325SJeff Bonwick 1761e14bb325SJeff Bonwick zio_nowait(zio_write(zio, spa, txg, &gbh->zg_blkptr[g], 1762e14bb325SJeff Bonwick (char *)pio->io_data + (pio->io_size - resid), lsize, &zp, 1763e14bb325SJeff Bonwick zio_write_gang_member_ready, NULL, &gn->gn_child[g], 1764e14bb325SJeff Bonwick pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1765e14bb325SJeff Bonwick &pio->io_bookmark)); 1766e14bb325SJeff Bonwick } 1767e05725b1Sbonwick 176844cd46caSbillm /* 1769e14bb325SJeff Bonwick * Set pio's pipeline to just wait for zio to finish. 177044cd46caSbillm */ 1771e14bb325SJeff Bonwick pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1772e14bb325SJeff Bonwick 1773e14bb325SJeff Bonwick zio_nowait(zio); 1774e14bb325SJeff Bonwick 1775e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1776fa9e4066Sahrens } 1777fa9e4066Sahrens 1778fa9e4066Sahrens /* 1779fa9e4066Sahrens * ========================================================================== 1780b24ab676SJeff Bonwick * Dedup 1781fa9e4066Sahrens * ========================================================================== 1782fa9e4066Sahrens */ 1783b24ab676SJeff Bonwick static void 1784b24ab676SJeff Bonwick zio_ddt_child_read_done(zio_t *zio) 1785b24ab676SJeff Bonwick { 1786b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1787b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1788b24ab676SJeff Bonwick ddt_phys_t *ddp; 1789b24ab676SJeff Bonwick zio_t *pio = zio_unique_parent(zio); 1790b24ab676SJeff Bonwick 1791b24ab676SJeff Bonwick mutex_enter(&pio->io_lock); 1792b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 1793b24ab676SJeff Bonwick if (zio->io_error == 0) 1794b24ab676SJeff Bonwick ddt_phys_clear(ddp); /* this ddp doesn't need repair */ 1795b24ab676SJeff Bonwick if (zio->io_error == 0 && dde->dde_repair_data == NULL) 1796b24ab676SJeff Bonwick dde->dde_repair_data = zio->io_data; 1797b24ab676SJeff Bonwick else 1798b24ab676SJeff Bonwick zio_buf_free(zio->io_data, zio->io_size); 1799b24ab676SJeff Bonwick mutex_exit(&pio->io_lock); 1800b24ab676SJeff Bonwick } 1801b24ab676SJeff Bonwick 1802b24ab676SJeff Bonwick static int 1803b24ab676SJeff Bonwick zio_ddt_read_start(zio_t *zio) 1804b24ab676SJeff Bonwick { 1805b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1806b24ab676SJeff Bonwick 1807b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1808b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1809b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1810b24ab676SJeff Bonwick 1811b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1812b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1813b24ab676SJeff Bonwick ddt_entry_t *dde = ddt_repair_start(ddt, bp); 1814b24ab676SJeff Bonwick ddt_phys_t *ddp = dde->dde_phys; 1815b24ab676SJeff Bonwick ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); 1816b24ab676SJeff Bonwick blkptr_t blk; 1817b24ab676SJeff Bonwick 1818b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1819b24ab676SJeff Bonwick zio->io_vsd = dde; 1820b24ab676SJeff Bonwick 1821b24ab676SJeff Bonwick if (ddp_self == NULL) 1822b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1823b24ab676SJeff Bonwick 1824b24ab676SJeff Bonwick for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { 1825b24ab676SJeff Bonwick if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) 1826b24ab676SJeff Bonwick continue; 1827bbfd46c4SJeff Bonwick ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, 1828bbfd46c4SJeff Bonwick &blk); 1829b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, &blk, 1830b24ab676SJeff Bonwick zio_buf_alloc(zio->io_size), zio->io_size, 1831b24ab676SJeff Bonwick zio_ddt_child_read_done, dde, zio->io_priority, 1832b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio) | ZIO_FLAG_DONT_PROPAGATE, 1833b24ab676SJeff Bonwick &zio->io_bookmark)); 1834b24ab676SJeff Bonwick } 1835b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1836b24ab676SJeff Bonwick } 1837b24ab676SJeff Bonwick 1838b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, bp, 1839b24ab676SJeff Bonwick zio->io_data, zio->io_size, NULL, NULL, zio->io_priority, 1840b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); 1841b24ab676SJeff Bonwick 1842b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1843b24ab676SJeff Bonwick } 1844e14bb325SJeff Bonwick 1845b24ab676SJeff Bonwick static int 1846b24ab676SJeff Bonwick zio_ddt_read_done(zio_t *zio) 1847b24ab676SJeff Bonwick { 1848b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1849b24ab676SJeff Bonwick 1850b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE)) 1851b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 1852b24ab676SJeff Bonwick 1853b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 1854b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 1855b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1856b24ab676SJeff Bonwick 1857b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 1858b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1859b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_vsd; 1860b24ab676SJeff Bonwick if (ddt == NULL) { 1861b16da2e2SGeorge Wilson ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE); 1862b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1863b24ab676SJeff Bonwick } 1864b24ab676SJeff Bonwick if (dde == NULL) { 1865b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; 186635a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 1867b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 1868b24ab676SJeff Bonwick } 1869b24ab676SJeff Bonwick if (dde->dde_repair_data != NULL) { 1870b24ab676SJeff Bonwick bcopy(dde->dde_repair_data, zio->io_data, zio->io_size); 1871b24ab676SJeff Bonwick zio->io_child_error[ZIO_CHILD_DDT] = 0; 1872b24ab676SJeff Bonwick } 1873b24ab676SJeff Bonwick ddt_repair_done(ddt, dde); 1874b24ab676SJeff Bonwick zio->io_vsd = NULL; 1875b24ab676SJeff Bonwick } 1876b24ab676SJeff Bonwick 1877b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 1878b24ab676SJeff Bonwick 1879b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1880b24ab676SJeff Bonwick } 1881b24ab676SJeff Bonwick 1882b24ab676SJeff Bonwick static boolean_t 1883b24ab676SJeff Bonwick zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) 1884b24ab676SJeff Bonwick { 1885b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 1886b24ab676SJeff Bonwick 1887b24ab676SJeff Bonwick /* 1888b24ab676SJeff Bonwick * Note: we compare the original data, not the transformed data, 1889b24ab676SJeff Bonwick * because when zio->io_bp is an override bp, we will not have 1890b24ab676SJeff Bonwick * pushed the I/O transforms. That's an important optimization 1891b24ab676SJeff Bonwick * because otherwise we'd compress/encrypt all dmu_sync() data twice. 1892b24ab676SJeff Bonwick */ 1893b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 1894b24ab676SJeff Bonwick zio_t *lio = dde->dde_lead_zio[p]; 1895b24ab676SJeff Bonwick 1896b24ab676SJeff Bonwick if (lio != NULL) { 1897b24ab676SJeff Bonwick return (lio->io_orig_size != zio->io_orig_size || 1898b24ab676SJeff Bonwick bcmp(zio->io_orig_data, lio->io_orig_data, 1899b24ab676SJeff Bonwick zio->io_orig_size) != 0); 1900b24ab676SJeff Bonwick } 1901b24ab676SJeff Bonwick } 1902b24ab676SJeff Bonwick 1903b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 1904b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1905b24ab676SJeff Bonwick 1906b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) { 1907b24ab676SJeff Bonwick arc_buf_t *abuf = NULL; 1908b24ab676SJeff Bonwick uint32_t aflags = ARC_WAIT; 1909b24ab676SJeff Bonwick blkptr_t blk = *zio->io_bp; 1910b24ab676SJeff Bonwick int error; 1911b24ab676SJeff Bonwick 1912b24ab676SJeff Bonwick ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); 1913b24ab676SJeff Bonwick 1914b24ab676SJeff Bonwick ddt_exit(ddt); 1915b24ab676SJeff Bonwick 1916b24ab676SJeff Bonwick error = arc_read_nolock(NULL, spa, &blk, 1917b24ab676SJeff Bonwick arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, 1918b24ab676SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 1919b24ab676SJeff Bonwick &aflags, &zio->io_bookmark); 1920b24ab676SJeff Bonwick 1921b24ab676SJeff Bonwick if (error == 0) { 1922b24ab676SJeff Bonwick if (arc_buf_size(abuf) != zio->io_orig_size || 1923b24ab676SJeff Bonwick bcmp(abuf->b_data, zio->io_orig_data, 1924b24ab676SJeff Bonwick zio->io_orig_size) != 0) 1925b24ab676SJeff Bonwick error = EEXIST; 1926b24ab676SJeff Bonwick VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 1927b24ab676SJeff Bonwick } 1928b24ab676SJeff Bonwick 1929b24ab676SJeff Bonwick ddt_enter(ddt); 1930b24ab676SJeff Bonwick return (error != 0); 1931b24ab676SJeff Bonwick } 1932b24ab676SJeff Bonwick } 1933b24ab676SJeff Bonwick 1934b24ab676SJeff Bonwick return (B_FALSE); 1935b24ab676SJeff Bonwick } 1936b24ab676SJeff Bonwick 1937b24ab676SJeff Bonwick static void 1938b24ab676SJeff Bonwick zio_ddt_child_write_ready(zio_t *zio) 1939b24ab676SJeff Bonwick { 1940b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 1941b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 1942b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1943b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1944b24ab676SJeff Bonwick zio_t *pio; 1945b24ab676SJeff Bonwick 1946b24ab676SJeff Bonwick if (zio->io_error) 1947b24ab676SJeff Bonwick return; 1948b24ab676SJeff Bonwick 1949b24ab676SJeff Bonwick ddt_enter(ddt); 1950b24ab676SJeff Bonwick 1951b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1952b24ab676SJeff Bonwick 1953b24ab676SJeff Bonwick ddt_phys_fill(ddp, zio->io_bp); 1954b24ab676SJeff Bonwick 1955b24ab676SJeff Bonwick while ((pio = zio_walk_parents(zio)) != NULL) 1956b24ab676SJeff Bonwick ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); 1957b24ab676SJeff Bonwick 1958b24ab676SJeff Bonwick ddt_exit(ddt); 1959b24ab676SJeff Bonwick } 1960b24ab676SJeff Bonwick 1961b24ab676SJeff Bonwick static void 1962b24ab676SJeff Bonwick zio_ddt_child_write_done(zio_t *zio) 1963b24ab676SJeff Bonwick { 1964b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 1965b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 1966b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1967b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1968b24ab676SJeff Bonwick 1969b24ab676SJeff Bonwick ddt_enter(ddt); 1970b24ab676SJeff Bonwick 1971b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 1972b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 1973b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 1974b24ab676SJeff Bonwick 1975b24ab676SJeff Bonwick if (zio->io_error == 0) { 1976b24ab676SJeff Bonwick while (zio_walk_parents(zio) != NULL) 1977b24ab676SJeff Bonwick ddt_phys_addref(ddp); 1978b24ab676SJeff Bonwick } else { 1979b24ab676SJeff Bonwick ddt_phys_clear(ddp); 1980b24ab676SJeff Bonwick } 1981b24ab676SJeff Bonwick 1982b24ab676SJeff Bonwick ddt_exit(ddt); 1983b24ab676SJeff Bonwick } 1984b24ab676SJeff Bonwick 1985b24ab676SJeff Bonwick static void 1986b24ab676SJeff Bonwick zio_ddt_ditto_write_done(zio_t *zio) 1987b24ab676SJeff Bonwick { 1988b24ab676SJeff Bonwick int p = DDT_PHYS_DITTO; 1989b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 1990b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1991b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 1992b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 1993b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 1994b24ab676SJeff Bonwick ddt_key_t *ddk = &dde->dde_key; 1995b24ab676SJeff Bonwick 1996b24ab676SJeff Bonwick ddt_enter(ddt); 1997b24ab676SJeff Bonwick 1998b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 1999b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2000b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 2001b24ab676SJeff Bonwick 2002b24ab676SJeff Bonwick if (zio->io_error == 0) { 2003b24ab676SJeff Bonwick ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); 2004b24ab676SJeff Bonwick ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); 2005b24ab676SJeff Bonwick ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); 2006b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2007b24ab676SJeff Bonwick ddt_phys_free(ddt, ddk, ddp, zio->io_txg); 2008b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2009b24ab676SJeff Bonwick } 2010b24ab676SJeff Bonwick 2011b24ab676SJeff Bonwick ddt_exit(ddt); 2012b24ab676SJeff Bonwick } 2013b24ab676SJeff Bonwick 2014b24ab676SJeff Bonwick static int 2015b24ab676SJeff Bonwick zio_ddt_write(zio_t *zio) 2016b24ab676SJeff Bonwick { 2017b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2018b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2019b24ab676SJeff Bonwick uint64_t txg = zio->io_txg; 2020b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 2021b24ab676SJeff Bonwick int p = zp->zp_copies; 2022b24ab676SJeff Bonwick int ditto_copies; 2023b24ab676SJeff Bonwick zio_t *cio = NULL; 2024b24ab676SJeff Bonwick zio_t *dio = NULL; 2025b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2026b24ab676SJeff Bonwick ddt_entry_t *dde; 2027b24ab676SJeff Bonwick ddt_phys_t *ddp; 2028b24ab676SJeff Bonwick 2029b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2030b24ab676SJeff Bonwick ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); 2031b24ab676SJeff Bonwick ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); 2032b24ab676SJeff Bonwick 2033b24ab676SJeff Bonwick ddt_enter(ddt); 2034b24ab676SJeff Bonwick dde = ddt_lookup(ddt, bp, B_TRUE); 2035b24ab676SJeff Bonwick ddp = &dde->dde_phys[p]; 2036b24ab676SJeff Bonwick 2037b24ab676SJeff Bonwick if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { 2038b24ab676SJeff Bonwick /* 2039b24ab676SJeff Bonwick * If we're using a weak checksum, upgrade to a strong checksum 2040b24ab676SJeff Bonwick * and try again. If we're already using a strong checksum, 2041b24ab676SJeff Bonwick * we can't resolve it, so just convert to an ordinary write. 2042b24ab676SJeff Bonwick * (And automatically e-mail a paper to Nature?) 2043b24ab676SJeff Bonwick */ 2044b24ab676SJeff Bonwick if (!zio_checksum_table[zp->zp_checksum].ci_dedup) { 2045b24ab676SJeff Bonwick zp->zp_checksum = spa_dedup_checksum(spa); 2046b24ab676SJeff Bonwick zio_pop_transforms(zio); 2047b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2048b24ab676SJeff Bonwick BP_ZERO(bp); 2049b24ab676SJeff Bonwick } else { 2050b24ab676SJeff Bonwick zp->zp_dedup = 0; 2051b24ab676SJeff Bonwick } 2052b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2053b24ab676SJeff Bonwick ddt_exit(ddt); 2054b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2055b24ab676SJeff Bonwick } 2056b24ab676SJeff Bonwick 2057b24ab676SJeff Bonwick ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); 2058b24ab676SJeff Bonwick ASSERT(ditto_copies < SPA_DVAS_PER_BP); 2059b24ab676SJeff Bonwick 2060b24ab676SJeff Bonwick if (ditto_copies > ddt_ditto_copies_present(dde) && 2061b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { 2062b24ab676SJeff Bonwick zio_prop_t czp = *zp; 2063b24ab676SJeff Bonwick 2064b24ab676SJeff Bonwick czp.zp_copies = ditto_copies; 2065b24ab676SJeff Bonwick 2066b24ab676SJeff Bonwick /* 2067b24ab676SJeff Bonwick * If we arrived here with an override bp, we won't have run 2068b24ab676SJeff Bonwick * the transform stack, so we won't have the data we need to 2069b24ab676SJeff Bonwick * generate a child i/o. So, toss the override bp and restart. 2070b24ab676SJeff Bonwick * This is safe, because using the override bp is just an 2071b24ab676SJeff Bonwick * optimization; and it's rare, so the cost doesn't matter. 2072b24ab676SJeff Bonwick */ 2073b24ab676SJeff Bonwick if (zio->io_bp_override) { 2074b24ab676SJeff Bonwick zio_pop_transforms(zio); 2075b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2076b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2077b24ab676SJeff Bonwick zio->io_bp_override = NULL; 2078b24ab676SJeff Bonwick BP_ZERO(bp); 2079b24ab676SJeff Bonwick ddt_exit(ddt); 2080b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2081b24ab676SJeff Bonwick } 2082b24ab676SJeff Bonwick 2083b24ab676SJeff Bonwick dio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 2084b24ab676SJeff Bonwick zio->io_orig_size, &czp, NULL, 2085b24ab676SJeff Bonwick zio_ddt_ditto_write_done, dde, zio->io_priority, 2086b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2087b24ab676SJeff Bonwick 2088b24ab676SJeff Bonwick zio_push_transform(dio, zio->io_data, zio->io_size, 0, NULL); 2089b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; 2090b24ab676SJeff Bonwick } 2091b24ab676SJeff Bonwick 2092b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { 2093b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2094b24ab676SJeff Bonwick ddt_bp_fill(ddp, bp, txg); 2095b24ab676SJeff Bonwick if (dde->dde_lead_zio[p] != NULL) 2096b24ab676SJeff Bonwick zio_add_child(zio, dde->dde_lead_zio[p]); 2097b24ab676SJeff Bonwick else 2098b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2099b24ab676SJeff Bonwick } else if (zio->io_bp_override) { 2100b24ab676SJeff Bonwick ASSERT(bp->blk_birth == txg); 2101b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, zio->io_bp_override)); 2102b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2103b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2104b24ab676SJeff Bonwick } else { 2105b24ab676SJeff Bonwick cio = zio_write(zio, spa, txg, bp, zio->io_orig_data, 2106b24ab676SJeff Bonwick zio->io_orig_size, zp, zio_ddt_child_write_ready, 2107b24ab676SJeff Bonwick zio_ddt_child_write_done, dde, zio->io_priority, 2108b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2109b24ab676SJeff Bonwick 2110b24ab676SJeff Bonwick zio_push_transform(cio, zio->io_data, zio->io_size, 0, NULL); 2111b24ab676SJeff Bonwick dde->dde_lead_zio[p] = cio; 2112b24ab676SJeff Bonwick } 2113b24ab676SJeff Bonwick 2114b24ab676SJeff Bonwick ddt_exit(ddt); 2115b24ab676SJeff Bonwick 2116b24ab676SJeff Bonwick if (cio) 2117b24ab676SJeff Bonwick zio_nowait(cio); 2118b24ab676SJeff Bonwick if (dio) 2119b24ab676SJeff Bonwick zio_nowait(dio); 2120b24ab676SJeff Bonwick 2121b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2122b24ab676SJeff Bonwick } 2123b24ab676SJeff Bonwick 21243f9d6ad7SLin Ling ddt_entry_t *freedde; /* for debugging */ 21253f9d6ad7SLin Ling 2126b24ab676SJeff Bonwick static int 2127b24ab676SJeff Bonwick zio_ddt_free(zio_t *zio) 2128b24ab676SJeff Bonwick { 2129b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2130b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2131b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2132b24ab676SJeff Bonwick ddt_entry_t *dde; 2133b24ab676SJeff Bonwick ddt_phys_t *ddp; 2134b24ab676SJeff Bonwick 2135b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2136b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2137b24ab676SJeff Bonwick 2138b24ab676SJeff Bonwick ddt_enter(ddt); 21393f9d6ad7SLin Ling freedde = dde = ddt_lookup(ddt, bp, B_TRUE); 2140b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 2141b24ab676SJeff Bonwick ddt_phys_decref(ddp); 2142b24ab676SJeff Bonwick ddt_exit(ddt); 2143b24ab676SJeff Bonwick 2144b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2145b24ab676SJeff Bonwick } 2146b24ab676SJeff Bonwick 2147b24ab676SJeff Bonwick /* 2148b24ab676SJeff Bonwick * ========================================================================== 2149b24ab676SJeff Bonwick * Allocate and free blocks 2150b24ab676SJeff Bonwick * ========================================================================== 2151b24ab676SJeff Bonwick */ 2152e05725b1Sbonwick static int 2153fa9e4066Sahrens zio_dva_allocate(zio_t *zio) 2154fa9e4066Sahrens { 21558654d025Sperrin spa_t *spa = zio->io_spa; 2156b24ab676SJeff Bonwick metaslab_class_t *mc = spa_normal_class(spa); 2157fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2158fa9e4066Sahrens int error; 215909c9d376SGeorge Wilson int flags = 0; 2160fa9e4066Sahrens 2161f5383399SBill Moore if (zio->io_gang_leader == NULL) { 2162f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 2163f5383399SBill Moore zio->io_gang_leader = zio; 2164f5383399SBill Moore } 2165f5383399SBill Moore 2166fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 2167fb09f5aaSMadhav Suresh ASSERT0(BP_GET_NDVAS(bp)); 2168b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, >, 0); 2169b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); 2170fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 2171fa9e4066Sahrens 217209c9d376SGeorge Wilson /* 217309c9d376SGeorge Wilson * The dump device does not support gang blocks so allocation on 217409c9d376SGeorge Wilson * behalf of the dump device (i.e. ZIO_FLAG_NODATA) must avoid 217509c9d376SGeorge Wilson * the "fast" gang feature. 217609c9d376SGeorge Wilson */ 217709c9d376SGeorge Wilson flags |= (zio->io_flags & ZIO_FLAG_NODATA) ? METASLAB_GANG_AVOID : 0; 217809c9d376SGeorge Wilson flags |= (zio->io_flags & ZIO_FLAG_GANG_CHILD) ? 217909c9d376SGeorge Wilson METASLAB_GANG_CHILD : 0; 2180e14bb325SJeff Bonwick error = metaslab_alloc(spa, mc, zio->io_size, bp, 218109c9d376SGeorge Wilson zio->io_prop.zp_copies, zio->io_txg, NULL, flags); 2182fa9e4066Sahrens 2183e14bb325SJeff Bonwick if (error) { 218409c9d376SGeorge Wilson spa_dbgmsg(spa, "%s: metaslab allocation failure: zio %p, " 218509c9d376SGeorge Wilson "size %llu, error %d", spa_name(spa), zio, zio->io_size, 218609c9d376SGeorge Wilson error); 2187e14bb325SJeff Bonwick if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) 2188e14bb325SJeff Bonwick return (zio_write_gang_block(zio)); 2189fa9e4066Sahrens zio->io_error = error; 2190fa9e4066Sahrens } 2191e05725b1Sbonwick 2192e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2193fa9e4066Sahrens } 2194fa9e4066Sahrens 2195e05725b1Sbonwick static int 2196fa9e4066Sahrens zio_dva_free(zio_t *zio) 2197fa9e4066Sahrens { 2198e14bb325SJeff Bonwick metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); 2199fa9e4066Sahrens 2200e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2201fa9e4066Sahrens } 2202fa9e4066Sahrens 2203e05725b1Sbonwick static int 2204fa9e4066Sahrens zio_dva_claim(zio_t *zio) 2205fa9e4066Sahrens { 2206e14bb325SJeff Bonwick int error; 2207e14bb325SJeff Bonwick 2208e14bb325SJeff Bonwick error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); 2209e14bb325SJeff Bonwick if (error) 2210e14bb325SJeff Bonwick zio->io_error = error; 2211fa9e4066Sahrens 2212e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2213fa9e4066Sahrens } 2214fa9e4066Sahrens 2215e14bb325SJeff Bonwick /* 2216e14bb325SJeff Bonwick * Undo an allocation. This is used by zio_done() when an I/O fails 2217e14bb325SJeff Bonwick * and we want to give back the block we just allocated. 2218e14bb325SJeff Bonwick * This handles both normal blocks and gang blocks. 2219e14bb325SJeff Bonwick */ 2220e14bb325SJeff Bonwick static void 2221e14bb325SJeff Bonwick zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) 2222e14bb325SJeff Bonwick { 2223e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2224b24ab676SJeff Bonwick ASSERT(zio->io_bp_override == NULL); 2225e14bb325SJeff Bonwick 2226e14bb325SJeff Bonwick if (!BP_IS_HOLE(bp)) 2227b24ab676SJeff Bonwick metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); 2228e14bb325SJeff Bonwick 2229e14bb325SJeff Bonwick if (gn != NULL) { 2230e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 2231e14bb325SJeff Bonwick zio_dva_unallocate(zio, gn->gn_child[g], 2232e14bb325SJeff Bonwick &gn->gn_gbh->zg_blkptr[g]); 2233e14bb325SJeff Bonwick } 2234e14bb325SJeff Bonwick } 2235e14bb325SJeff Bonwick } 2236e14bb325SJeff Bonwick 2237e14bb325SJeff Bonwick /* 2238e14bb325SJeff Bonwick * Try to allocate an intent log block. Return 0 on success, errno on failure. 2239e14bb325SJeff Bonwick */ 2240e14bb325SJeff Bonwick int 2241b24ab676SJeff Bonwick zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, blkptr_t *old_bp, 2242b24ab676SJeff Bonwick uint64_t size, boolean_t use_slog) 2243e14bb325SJeff Bonwick { 2244e09fa4daSNeil Perrin int error = 1; 2245e14bb325SJeff Bonwick 2246b24ab676SJeff Bonwick ASSERT(txg > spa_syncing_txg(spa)); 2247b24ab676SJeff Bonwick 2248840345f6SGeorge Wilson /* 2249840345f6SGeorge Wilson * ZIL blocks are always contiguous (i.e. not gang blocks) so we 2250840345f6SGeorge Wilson * set the METASLAB_GANG_AVOID flag so that they don't "fast gang" 2251840345f6SGeorge Wilson * when allocating them. 2252840345f6SGeorge Wilson */ 2253840345f6SGeorge Wilson if (use_slog) { 2254b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_log_class(spa), size, 2255840345f6SGeorge Wilson new_bp, 1, txg, old_bp, 2256840345f6SGeorge Wilson METASLAB_HINTBP_AVOID | METASLAB_GANG_AVOID); 2257840345f6SGeorge Wilson } 2258e14bb325SJeff Bonwick 2259840345f6SGeorge Wilson if (error) { 2260b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), size, 2261840345f6SGeorge Wilson new_bp, 1, txg, old_bp, 2262840345f6SGeorge Wilson METASLAB_HINTBP_AVOID | METASLAB_GANG_AVOID); 2263840345f6SGeorge Wilson } 2264e14bb325SJeff Bonwick 2265e14bb325SJeff Bonwick if (error == 0) { 2266e14bb325SJeff Bonwick BP_SET_LSIZE(new_bp, size); 2267e14bb325SJeff Bonwick BP_SET_PSIZE(new_bp, size); 2268e14bb325SJeff Bonwick BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); 22696e1f5caaSNeil Perrin BP_SET_CHECKSUM(new_bp, 22706e1f5caaSNeil Perrin spa_version(spa) >= SPA_VERSION_SLIM_ZIL 22716e1f5caaSNeil Perrin ? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG); 2272e14bb325SJeff Bonwick BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 2273e14bb325SJeff Bonwick BP_SET_LEVEL(new_bp, 0); 2274b24ab676SJeff Bonwick BP_SET_DEDUP(new_bp, 0); 2275e14bb325SJeff Bonwick BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); 2276e14bb325SJeff Bonwick } 2277e14bb325SJeff Bonwick 2278e14bb325SJeff Bonwick return (error); 2279e14bb325SJeff Bonwick } 2280e14bb325SJeff Bonwick 2281e14bb325SJeff Bonwick /* 2282b24ab676SJeff Bonwick * Free an intent log block. 2283e14bb325SJeff Bonwick */ 2284e14bb325SJeff Bonwick void 2285b24ab676SJeff Bonwick zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp) 2286e14bb325SJeff Bonwick { 2287b24ab676SJeff Bonwick ASSERT(BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG); 2288e14bb325SJeff Bonwick ASSERT(!BP_IS_GANG(bp)); 2289e14bb325SJeff Bonwick 2290b24ab676SJeff Bonwick zio_free(spa, txg, bp); 2291e14bb325SJeff Bonwick } 2292e14bb325SJeff Bonwick 2293fa9e4066Sahrens /* 2294fa9e4066Sahrens * ========================================================================== 2295fa9e4066Sahrens * Read and write to physical devices 2296fa9e4066Sahrens * ========================================================================== 2297fa9e4066Sahrens */ 2298e05725b1Sbonwick static int 229944cd46caSbillm zio_vdev_io_start(zio_t *zio) 2300fa9e4066Sahrens { 2301fa9e4066Sahrens vdev_t *vd = zio->io_vd; 230244cd46caSbillm uint64_t align; 23030a4e9518Sgw spa_t *spa = zio->io_spa; 23040a4e9518Sgw 2305e14bb325SJeff Bonwick ASSERT(zio->io_error == 0); 2306e14bb325SJeff Bonwick ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); 2307fa9e4066Sahrens 2308e14bb325SJeff Bonwick if (vd == NULL) { 2309e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2310e14bb325SJeff Bonwick spa_config_enter(spa, SCL_ZIO, zio, RW_READER); 2311fa9e4066Sahrens 2312e14bb325SJeff Bonwick /* 2313e14bb325SJeff Bonwick * The mirror_ops handle multiple DVAs in a single BP. 2314e14bb325SJeff Bonwick */ 2315e14bb325SJeff Bonwick return (vdev_mirror_ops.vdev_op_io_start(zio)); 2316fa9e4066Sahrens } 2317fa9e4066Sahrens 231844ecc532SGeorge Wilson /* 231944ecc532SGeorge Wilson * We keep track of time-sensitive I/Os so that the scan thread 232044ecc532SGeorge Wilson * can quickly react to certain workloads. In particular, we care 232144ecc532SGeorge Wilson * about non-scrubbing, top-level reads and writes with the following 232244ecc532SGeorge Wilson * characteristics: 232344ecc532SGeorge Wilson * - synchronous writes of user data to non-slog devices 232444ecc532SGeorge Wilson * - any reads of user data 232544ecc532SGeorge Wilson * When these conditions are met, adjust the timestamp of spa_last_io 232644ecc532SGeorge Wilson * which allows the scan thread to adjust its workload accordingly. 232744ecc532SGeorge Wilson */ 232844ecc532SGeorge Wilson if (!(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && zio->io_bp != NULL && 232944ecc532SGeorge Wilson vd == vd->vdev_top && !vd->vdev_islog && 233044ecc532SGeorge Wilson zio->io_bookmark.zb_objset != DMU_META_OBJSET && 233144ecc532SGeorge Wilson zio->io_txg != spa_syncing_txg(spa)) { 233244ecc532SGeorge Wilson uint64_t old = spa->spa_last_io; 233344ecc532SGeorge Wilson uint64_t new = ddi_get_lbolt64(); 233444ecc532SGeorge Wilson if (old != new) 233544ecc532SGeorge Wilson (void) atomic_cas_64(&spa->spa_last_io, old, new); 233644ecc532SGeorge Wilson } 233744ecc532SGeorge Wilson 2338e14bb325SJeff Bonwick align = 1ULL << vd->vdev_top->vdev_ashift; 2339e14bb325SJeff Bonwick 2340ecc2d604Sbonwick if (P2PHASE(zio->io_size, align) != 0) { 2341ecc2d604Sbonwick uint64_t asize = P2ROUNDUP(zio->io_size, align); 2342ecc2d604Sbonwick char *abuf = zio_buf_alloc(asize); 2343e14bb325SJeff Bonwick ASSERT(vd == vd->vdev_top); 2344ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_WRITE) { 2345ecc2d604Sbonwick bcopy(zio->io_data, abuf, zio->io_size); 2346ecc2d604Sbonwick bzero(abuf + zio->io_size, asize - zio->io_size); 2347ecc2d604Sbonwick } 2348e14bb325SJeff Bonwick zio_push_transform(zio, abuf, asize, asize, zio_subblock); 2349ecc2d604Sbonwick } 2350ecc2d604Sbonwick 2351ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_offset, align) == 0); 2352ecc2d604Sbonwick ASSERT(P2PHASE(zio->io_size, align) == 0); 2353f9af39baSGeorge Wilson VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); 23548ad4d6ddSJeff Bonwick 23558ad4d6ddSJeff Bonwick /* 23568ad4d6ddSJeff Bonwick * If this is a repair I/O, and there's no self-healing involved -- 23578ad4d6ddSJeff Bonwick * that is, we're just resilvering what we expect to resilver -- 23588ad4d6ddSJeff Bonwick * then don't do the I/O unless zio's txg is actually in vd's DTL. 23598ad4d6ddSJeff Bonwick * This prevents spurious resilvering with nested replication. 23608ad4d6ddSJeff Bonwick * For example, given a mirror of mirrors, (A+B)+(C+D), if only 23618ad4d6ddSJeff Bonwick * A is out of date, we'll read from C+D, then use the data to 23628ad4d6ddSJeff Bonwick * resilver A+B -- but we don't actually want to resilver B, just A. 23638ad4d6ddSJeff Bonwick * The top-level mirror has no way to know this, so instead we just 23648ad4d6ddSJeff Bonwick * discard unnecessary repairs as we work our way down the vdev tree. 23658ad4d6ddSJeff Bonwick * The same logic applies to any form of nested replication: 23668ad4d6ddSJeff Bonwick * ditto + mirror, RAID-Z + replacing, etc. This covers them all. 23678ad4d6ddSJeff Bonwick */ 23688ad4d6ddSJeff Bonwick if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && 23698ad4d6ddSJeff Bonwick !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && 23708ad4d6ddSJeff Bonwick zio->io_txg != 0 && /* not a delegated i/o */ 23718ad4d6ddSJeff Bonwick !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { 23728ad4d6ddSJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 23738ad4d6ddSJeff Bonwick zio_vdev_io_bypass(zio); 23748ad4d6ddSJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 23758ad4d6ddSJeff Bonwick } 2376fa9e4066Sahrens 2377e14bb325SJeff Bonwick if (vd->vdev_ops->vdev_op_leaf && 2378e14bb325SJeff Bonwick (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { 2379e14bb325SJeff Bonwick 2380e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) 2381a3f829aeSBill Moore return (ZIO_PIPELINE_CONTINUE); 2382e14bb325SJeff Bonwick 2383e14bb325SJeff Bonwick if ((zio = vdev_queue_io(zio)) == NULL) 2384e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2385e14bb325SJeff Bonwick 2386e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2387e14bb325SJeff Bonwick zio->io_error = ENXIO; 2388e14bb325SJeff Bonwick zio_interrupt(zio); 2389e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2390e14bb325SJeff Bonwick } 2391e14bb325SJeff Bonwick } 2392e14bb325SJeff Bonwick 2393e05725b1Sbonwick return (vd->vdev_ops->vdev_op_io_start(zio)); 2394fa9e4066Sahrens } 2395fa9e4066Sahrens 2396e05725b1Sbonwick static int 2397fa9e4066Sahrens zio_vdev_io_done(zio_t *zio) 2398fa9e4066Sahrens { 2399e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2400e14bb325SJeff Bonwick vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; 2401e14bb325SJeff Bonwick boolean_t unexpected_error = B_FALSE; 2402e05725b1Sbonwick 2403e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2404e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2405fa9e4066Sahrens 2406e14bb325SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); 2407e14bb325SJeff Bonwick 2408e14bb325SJeff Bonwick if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { 2409e14bb325SJeff Bonwick 2410e14bb325SJeff Bonwick vdev_queue_io_done(zio); 2411fa9e4066Sahrens 2412e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE) 2413e14bb325SJeff Bonwick vdev_cache_write(zio); 2414e14bb325SJeff Bonwick 2415e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 24168956713aSEric Schrock zio->io_error = zio_handle_device_injection(vd, 24178956713aSEric Schrock zio, EIO); 2418e14bb325SJeff Bonwick 2419e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2420e14bb325SJeff Bonwick zio->io_error = zio_handle_label_injection(zio, EIO); 2421e14bb325SJeff Bonwick 2422e14bb325SJeff Bonwick if (zio->io_error) { 2423e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 2424e14bb325SJeff Bonwick zio->io_error = ENXIO; 2425e14bb325SJeff Bonwick } else { 2426e14bb325SJeff Bonwick unexpected_error = B_TRUE; 2427e14bb325SJeff Bonwick } 2428e14bb325SJeff Bonwick } 242951ece835Seschrock } 2430fa9e4066Sahrens 2431e14bb325SJeff Bonwick ops->vdev_op_io_done(zio); 2432e14bb325SJeff Bonwick 2433e14bb325SJeff Bonwick if (unexpected_error) 2434a3f829aeSBill Moore VERIFY(vdev_probe(vd, zio) == NULL); 2435e14bb325SJeff Bonwick 2436e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2437fa9e4066Sahrens } 2438fa9e4066Sahrens 243922fe2c88SJonathan Adams /* 244022fe2c88SJonathan Adams * For non-raidz ZIOs, we can just copy aside the bad data read from the 244122fe2c88SJonathan Adams * disk, and use that to finish the checksum ereport later. 244222fe2c88SJonathan Adams */ 244322fe2c88SJonathan Adams static void 244422fe2c88SJonathan Adams zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, 244522fe2c88SJonathan Adams const void *good_buf) 244622fe2c88SJonathan Adams { 244722fe2c88SJonathan Adams /* no processing needed */ 244822fe2c88SJonathan Adams zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); 244922fe2c88SJonathan Adams } 245022fe2c88SJonathan Adams 245122fe2c88SJonathan Adams /*ARGSUSED*/ 245222fe2c88SJonathan Adams void 245322fe2c88SJonathan Adams zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) 245422fe2c88SJonathan Adams { 245522fe2c88SJonathan Adams void *buf = zio_buf_alloc(zio->io_size); 245622fe2c88SJonathan Adams 245722fe2c88SJonathan Adams bcopy(zio->io_data, buf, zio->io_size); 245822fe2c88SJonathan Adams 245922fe2c88SJonathan Adams zcr->zcr_cbinfo = zio->io_size; 246022fe2c88SJonathan Adams zcr->zcr_cbdata = buf; 246122fe2c88SJonathan Adams zcr->zcr_finish = zio_vsd_default_cksum_finish; 246222fe2c88SJonathan Adams zcr->zcr_free = zio_buf_free; 246322fe2c88SJonathan Adams } 246422fe2c88SJonathan Adams 2465e05725b1Sbonwick static int 2466fa9e4066Sahrens zio_vdev_io_assess(zio_t *zio) 2467fa9e4066Sahrens { 2468fa9e4066Sahrens vdev_t *vd = zio->io_vd; 2469e14bb325SJeff Bonwick 2470e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE)) 2471e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2472e14bb325SJeff Bonwick 2473e14bb325SJeff Bonwick if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 2474e14bb325SJeff Bonwick spa_config_exit(zio->io_spa, SCL_ZIO, zio); 2475e14bb325SJeff Bonwick 2476e14bb325SJeff Bonwick if (zio->io_vsd != NULL) { 247722fe2c88SJonathan Adams zio->io_vsd_ops->vsd_free(zio); 2478e14bb325SJeff Bonwick zio->io_vsd = NULL; 2479ecc2d604Sbonwick } 2480ecc2d604Sbonwick 2481e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 2482ea8dc4b6Seschrock zio->io_error = zio_handle_fault_injection(zio, EIO); 2483ea8dc4b6Seschrock 2484fa9e4066Sahrens /* 2485fa9e4066Sahrens * If the I/O failed, determine whether we should attempt to retry it. 248635a5a358SJonathan Adams * 248735a5a358SJonathan Adams * On retry, we cut in line in the issue queue, since we don't want 248835a5a358SJonathan Adams * compression/checksumming/etc. work to prevent our (cheap) IO reissue. 2489fa9e4066Sahrens */ 2490e14bb325SJeff Bonwick if (zio->io_error && vd == NULL && 2491e14bb325SJeff Bonwick !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { 2492e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ 2493e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ 2494fa9e4066Sahrens zio->io_error = 0; 2495e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_RETRY | 2496e14bb325SJeff Bonwick ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; 2497b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; 249835a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, 249935a5a358SJonathan Adams zio_requeue_io_start_cut_in_line); 2500e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2501ea8dc4b6Seschrock } 2502fa9e4066Sahrens 2503e14bb325SJeff Bonwick /* 2504e14bb325SJeff Bonwick * If we got an error on a leaf device, convert it to ENXIO 2505e14bb325SJeff Bonwick * if the device is not accessible at all. 2506e14bb325SJeff Bonwick */ 2507e14bb325SJeff Bonwick if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && 2508e14bb325SJeff Bonwick !vdev_accessible(vd, zio)) 2509e14bb325SJeff Bonwick zio->io_error = ENXIO; 2510e14bb325SJeff Bonwick 2511e14bb325SJeff Bonwick /* 2512e14bb325SJeff Bonwick * If we can't write to an interior vdev (mirror or RAID-Z), 2513e14bb325SJeff Bonwick * set vdev_cant_write so that we stop trying to allocate from it. 2514e14bb325SJeff Bonwick */ 2515e14bb325SJeff Bonwick if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && 2516e14bb325SJeff Bonwick vd != NULL && !vd->vdev_ops->vdev_op_leaf) 2517e14bb325SJeff Bonwick vd->vdev_cant_write = B_TRUE; 2518e14bb325SJeff Bonwick 2519e14bb325SJeff Bonwick if (zio->io_error) 2520e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2521e14bb325SJeff Bonwick 2522e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2523fa9e4066Sahrens } 2524fa9e4066Sahrens 2525fa9e4066Sahrens void 2526fa9e4066Sahrens zio_vdev_io_reissue(zio_t *zio) 2527fa9e4066Sahrens { 2528fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2529fa9e4066Sahrens ASSERT(zio->io_error == 0); 2530fa9e4066Sahrens 2531b24ab676SJeff Bonwick zio->io_stage >>= 1; 2532fa9e4066Sahrens } 2533fa9e4066Sahrens 2534fa9e4066Sahrens void 2535fa9e4066Sahrens zio_vdev_io_redone(zio_t *zio) 2536fa9e4066Sahrens { 2537fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); 2538fa9e4066Sahrens 2539b24ab676SJeff Bonwick zio->io_stage >>= 1; 2540fa9e4066Sahrens } 2541fa9e4066Sahrens 2542fa9e4066Sahrens void 2543fa9e4066Sahrens zio_vdev_io_bypass(zio_t *zio) 2544fa9e4066Sahrens { 2545fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 2546fa9e4066Sahrens ASSERT(zio->io_error == 0); 2547fa9e4066Sahrens 2548fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_IO_BYPASS; 2549b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; 2550fa9e4066Sahrens } 2551fa9e4066Sahrens 2552fa9e4066Sahrens /* 2553fa9e4066Sahrens * ========================================================================== 2554fa9e4066Sahrens * Generate and verify checksums 2555fa9e4066Sahrens * ========================================================================== 2556fa9e4066Sahrens */ 2557e05725b1Sbonwick static int 2558fa9e4066Sahrens zio_checksum_generate(zio_t *zio) 2559fa9e4066Sahrens { 2560fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2561e14bb325SJeff Bonwick enum zio_checksum checksum; 2562fa9e4066Sahrens 2563e14bb325SJeff Bonwick if (bp == NULL) { 2564e14bb325SJeff Bonwick /* 2565e14bb325SJeff Bonwick * This is zio_write_phys(). 2566e14bb325SJeff Bonwick * We're either generating a label checksum, or none at all. 2567e14bb325SJeff Bonwick */ 2568e14bb325SJeff Bonwick checksum = zio->io_prop.zp_checksum; 2569e14bb325SJeff Bonwick 2570e14bb325SJeff Bonwick if (checksum == ZIO_CHECKSUM_OFF) 2571e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2572fa9e4066Sahrens 2573e14bb325SJeff Bonwick ASSERT(checksum == ZIO_CHECKSUM_LABEL); 2574e14bb325SJeff Bonwick } else { 2575e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { 2576e14bb325SJeff Bonwick ASSERT(!IO_IS_ALLOCATING(zio)); 2577e14bb325SJeff Bonwick checksum = ZIO_CHECKSUM_GANG_HEADER; 2578e14bb325SJeff Bonwick } else { 2579e14bb325SJeff Bonwick checksum = BP_GET_CHECKSUM(bp); 2580e14bb325SJeff Bonwick } 2581e14bb325SJeff Bonwick } 2582fa9e4066Sahrens 2583e14bb325SJeff Bonwick zio_checksum_compute(zio, checksum, zio->io_data, zio->io_size); 2584fa9e4066Sahrens 2585e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2586fa9e4066Sahrens } 2587fa9e4066Sahrens 2588e05725b1Sbonwick static int 2589e14bb325SJeff Bonwick zio_checksum_verify(zio_t *zio) 2590fa9e4066Sahrens { 259122fe2c88SJonathan Adams zio_bad_cksum_t info; 2592e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2593e14bb325SJeff Bonwick int error; 2594fa9e4066Sahrens 2595b24ab676SJeff Bonwick ASSERT(zio->io_vd != NULL); 2596b24ab676SJeff Bonwick 2597e14bb325SJeff Bonwick if (bp == NULL) { 2598e14bb325SJeff Bonwick /* 2599e14bb325SJeff Bonwick * This is zio_read_phys(). 2600e14bb325SJeff Bonwick * We're either verifying a label checksum, or nothing at all. 2601e14bb325SJeff Bonwick */ 2602e14bb325SJeff Bonwick if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) 2603e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2604fa9e4066Sahrens 2605e14bb325SJeff Bonwick ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); 2606e14bb325SJeff Bonwick } 2607fa9e4066Sahrens 260822fe2c88SJonathan Adams if ((error = zio_checksum_error(zio, &info)) != 0) { 2609e14bb325SJeff Bonwick zio->io_error = error; 2610e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { 261122fe2c88SJonathan Adams zfs_ereport_start_checksum(zio->io_spa, 261222fe2c88SJonathan Adams zio->io_vd, zio, zio->io_offset, 261322fe2c88SJonathan Adams zio->io_size, NULL, &info); 2614e14bb325SJeff Bonwick } 2615fa9e4066Sahrens } 2616fa9e4066Sahrens 2617e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2618fa9e4066Sahrens } 2619fa9e4066Sahrens 2620fa9e4066Sahrens /* 2621fa9e4066Sahrens * Called by RAID-Z to ensure we don't compute the checksum twice. 2622fa9e4066Sahrens */ 2623fa9e4066Sahrens void 2624fa9e4066Sahrens zio_checksum_verified(zio_t *zio) 2625fa9e4066Sahrens { 2626b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 2627fa9e4066Sahrens } 2628fa9e4066Sahrens 2629fa9e4066Sahrens /* 2630e14bb325SJeff Bonwick * ========================================================================== 2631e14bb325SJeff Bonwick * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. 2632e14bb325SJeff Bonwick * An error of 0 indictes success. ENXIO indicates whole-device failure, 2633e14bb325SJeff Bonwick * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO 2634e14bb325SJeff Bonwick * indicate errors that are specific to one I/O, and most likely permanent. 2635e14bb325SJeff Bonwick * Any other error is presumed to be worse because we weren't expecting it. 2636e14bb325SJeff Bonwick * ========================================================================== 2637fa9e4066Sahrens */ 2638e14bb325SJeff Bonwick int 2639e14bb325SJeff Bonwick zio_worst_error(int e1, int e2) 2640fa9e4066Sahrens { 2641e14bb325SJeff Bonwick static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; 2642e14bb325SJeff Bonwick int r1, r2; 2643e14bb325SJeff Bonwick 2644e14bb325SJeff Bonwick for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) 2645e14bb325SJeff Bonwick if (e1 == zio_error_rank[r1]) 2646e14bb325SJeff Bonwick break; 2647e14bb325SJeff Bonwick 2648e14bb325SJeff Bonwick for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) 2649e14bb325SJeff Bonwick if (e2 == zio_error_rank[r2]) 2650e14bb325SJeff Bonwick break; 265144cd46caSbillm 2652e14bb325SJeff Bonwick return (r1 > r2 ? e1 : e2); 2653fa9e4066Sahrens } 2654fa9e4066Sahrens 2655fa9e4066Sahrens /* 2656fa9e4066Sahrens * ========================================================================== 2657e14bb325SJeff Bonwick * I/O completion 2658fa9e4066Sahrens * ========================================================================== 2659fa9e4066Sahrens */ 2660e14bb325SJeff Bonwick static int 2661e14bb325SJeff Bonwick zio_ready(zio_t *zio) 2662fa9e4066Sahrens { 2663e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2664a3f829aeSBill Moore zio_t *pio, *pio_next; 2665fa9e4066Sahrens 2666b24ab676SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_READY) || 2667b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_READY)) 2668f5383399SBill Moore return (ZIO_PIPELINE_STOP); 2669fa9e4066Sahrens 2670f5383399SBill Moore if (zio->io_ready) { 2671e14bb325SJeff Bonwick ASSERT(IO_IS_ALLOCATING(zio)); 2672e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2673e14bb325SJeff Bonwick ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); 2674fa9e4066Sahrens 2675e14bb325SJeff Bonwick zio->io_ready(zio); 2676e14bb325SJeff Bonwick } 2677fa9e4066Sahrens 2678e14bb325SJeff Bonwick if (bp != NULL && bp != &zio->io_bp_copy) 2679e14bb325SJeff Bonwick zio->io_bp_copy = *bp; 2680fa9e4066Sahrens 2681e14bb325SJeff Bonwick if (zio->io_error) 2682e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2683fa9e4066Sahrens 2684a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2685a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = 1; 2686a3f829aeSBill Moore pio = zio_walk_parents(zio); 2687a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2688a3f829aeSBill Moore 2689a3f829aeSBill Moore /* 2690a3f829aeSBill Moore * As we notify zio's parents, new parents could be added. 2691a3f829aeSBill Moore * New parents go to the head of zio's io_parent_list, however, 2692a3f829aeSBill Moore * so we will (correctly) not notify them. The remainder of zio's 2693a3f829aeSBill Moore * io_parent_list, from 'pio_next' onward, cannot change because 2694a3f829aeSBill Moore * all parents must wait for us to be done before they can be done. 2695a3f829aeSBill Moore */ 2696a3f829aeSBill Moore for (; pio != NULL; pio = pio_next) { 2697a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2698e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_READY); 2699a3f829aeSBill Moore } 2700fa9e4066Sahrens 2701b24ab676SJeff Bonwick if (zio->io_flags & ZIO_FLAG_NODATA) { 2702b24ab676SJeff Bonwick if (BP_IS_GANG(bp)) { 2703b24ab676SJeff Bonwick zio->io_flags &= ~ZIO_FLAG_NODATA; 2704b24ab676SJeff Bonwick } else { 2705b24ab676SJeff Bonwick ASSERT((uintptr_t)zio->io_data < SPA_MAXBLOCKSIZE); 2706b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 2707b24ab676SJeff Bonwick } 2708b24ab676SJeff Bonwick } 2709b24ab676SJeff Bonwick 2710a33cae98STim Haley if (zio_injection_enabled && 2711a33cae98STim Haley zio->io_spa->spa_syncing_txg == zio->io_txg) 2712a33cae98STim Haley zio_handle_ignored_writes(zio); 2713a33cae98STim Haley 2714e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2715fa9e4066Sahrens } 2716fa9e4066Sahrens 2717e14bb325SJeff Bonwick static int 2718e14bb325SJeff Bonwick zio_done(zio_t *zio) 2719d63d470bSgw { 2720e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 2721e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 2722e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2723e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 2724e14bb325SJeff Bonwick uint64_t psize = zio->io_size; 2725a3f829aeSBill Moore zio_t *pio, *pio_next; 2726d63d470bSgw 2727e14bb325SJeff Bonwick /* 2728f5383399SBill Moore * If our children haven't all completed, 2729e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 2730e14bb325SJeff Bonwick */ 2731e14bb325SJeff Bonwick if (zio_wait_for_children(zio, ZIO_CHILD_VDEV, ZIO_WAIT_DONE) || 2732e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_GANG, ZIO_WAIT_DONE) || 2733b24ab676SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_DDT, ZIO_WAIT_DONE) || 2734e14bb325SJeff Bonwick zio_wait_for_children(zio, ZIO_CHILD_LOGICAL, ZIO_WAIT_DONE)) 2735e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2736d63d470bSgw 2737e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 2738e14bb325SJeff Bonwick for (int w = 0; w < ZIO_WAIT_TYPES; w++) 2739e14bb325SJeff Bonwick ASSERT(zio->io_children[c][w] == 0); 2740e14bb325SJeff Bonwick 2741e14bb325SJeff Bonwick if (bp != NULL) { 2742e14bb325SJeff Bonwick ASSERT(bp->blk_pad[0] == 0); 2743e14bb325SJeff Bonwick ASSERT(bp->blk_pad[1] == 0); 2744e14bb325SJeff Bonwick ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || 2745a3f829aeSBill Moore (bp == zio_unique_parent(zio)->io_bp)); 2746e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && 2747b24ab676SJeff Bonwick zio->io_bp_override == NULL && 2748e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { 2749e14bb325SJeff Bonwick ASSERT(!BP_SHOULD_BYTESWAP(bp)); 2750b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(bp)); 2751e14bb325SJeff Bonwick ASSERT(BP_COUNT_GANG(bp) == 0 || 2752e14bb325SJeff Bonwick (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); 2753e14bb325SJeff Bonwick } 2754e14bb325SJeff Bonwick } 2755fa9e4066Sahrens 2756e14bb325SJeff Bonwick /* 2757b24ab676SJeff Bonwick * If there were child vdev/gang/ddt errors, they apply to us now. 2758e14bb325SJeff Bonwick */ 2759e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); 2760e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_GANG); 2761b24ab676SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_DDT); 2762b24ab676SJeff Bonwick 2763b24ab676SJeff Bonwick /* 2764b24ab676SJeff Bonwick * If the I/O on the transformed data was successful, generate any 2765b24ab676SJeff Bonwick * checksum reports now while we still have the transformed data. 2766b24ab676SJeff Bonwick */ 2767b24ab676SJeff Bonwick if (zio->io_error == 0) { 2768b24ab676SJeff Bonwick while (zio->io_cksum_report != NULL) { 2769b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 2770b24ab676SJeff Bonwick uint64_t align = zcr->zcr_align; 2771b24ab676SJeff Bonwick uint64_t asize = P2ROUNDUP(psize, align); 2772b24ab676SJeff Bonwick char *abuf = zio->io_data; 2773b24ab676SJeff Bonwick 2774b24ab676SJeff Bonwick if (asize != psize) { 2775b24ab676SJeff Bonwick abuf = zio_buf_alloc(asize); 2776b24ab676SJeff Bonwick bcopy(zio->io_data, abuf, psize); 2777b24ab676SJeff Bonwick bzero(abuf + psize, asize - psize); 2778b24ab676SJeff Bonwick } 2779b24ab676SJeff Bonwick 2780b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 2781b24ab676SJeff Bonwick zcr->zcr_next = NULL; 2782b24ab676SJeff Bonwick zcr->zcr_finish(zcr, abuf); 2783b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 2784b24ab676SJeff Bonwick 2785b24ab676SJeff Bonwick if (asize != psize) 2786b24ab676SJeff Bonwick zio_buf_free(abuf, asize); 2787b24ab676SJeff Bonwick } 2788b24ab676SJeff Bonwick } 2789e14bb325SJeff Bonwick 2790e14bb325SJeff Bonwick zio_pop_transforms(zio); /* note: may set zio->io_error */ 2791e14bb325SJeff Bonwick 2792e14bb325SJeff Bonwick vdev_stat_update(zio, psize); 2793e14bb325SJeff Bonwick 2794e14bb325SJeff Bonwick if (zio->io_error) { 2795e14bb325SJeff Bonwick /* 2796e14bb325SJeff Bonwick * If this I/O is attached to a particular vdev, 2797e14bb325SJeff Bonwick * generate an error message describing the I/O failure 2798e14bb325SJeff Bonwick * at the block level. We ignore these errors if the 2799e14bb325SJeff Bonwick * device is currently unavailable. 2800e14bb325SJeff Bonwick */ 2801e14bb325SJeff Bonwick if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) 2802e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, zio, 0, 0); 2803e14bb325SJeff Bonwick 28048f18d1faSGeorge Wilson if ((zio->io_error == EIO || !(zio->io_flags & 28058f18d1faSGeorge Wilson (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && 28068f18d1faSGeorge Wilson zio == lio) { 2807e14bb325SJeff Bonwick /* 2808e14bb325SJeff Bonwick * For logical I/O requests, tell the SPA to log the 2809e14bb325SJeff Bonwick * error and generate a logical data ereport. 2810e14bb325SJeff Bonwick */ 2811e14bb325SJeff Bonwick spa_log_error(spa, zio); 2812e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, zio, 2813e14bb325SJeff Bonwick 0, 0); 2814e14bb325SJeff Bonwick } 2815e14bb325SJeff Bonwick } 2816fa9e4066Sahrens 2817e14bb325SJeff Bonwick if (zio->io_error && zio == lio) { 2818e14bb325SJeff Bonwick /* 2819e14bb325SJeff Bonwick * Determine whether zio should be reexecuted. This will 2820e14bb325SJeff Bonwick * propagate all the way to the root via zio_notify_parent(). 2821e14bb325SJeff Bonwick */ 2822e14bb325SJeff Bonwick ASSERT(vd == NULL && bp != NULL); 2823b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2824e14bb325SJeff Bonwick 2825b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(zio) && 2826b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_CANFAIL)) { 2827e14bb325SJeff Bonwick if (zio->io_error != ENOSPC) 2828e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_NOW; 2829e14bb325SJeff Bonwick else 2830e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2831b24ab676SJeff Bonwick } 2832e14bb325SJeff Bonwick 2833e14bb325SJeff Bonwick if ((zio->io_type == ZIO_TYPE_READ || 2834e14bb325SJeff Bonwick zio->io_type == ZIO_TYPE_FREE) && 283544ecc532SGeorge Wilson !(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && 2836e14bb325SJeff Bonwick zio->io_error == ENXIO && 2837b16da2e2SGeorge Wilson spa_load_state(spa) == SPA_LOAD_NONE && 2838e14bb325SJeff Bonwick spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) 2839e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 2840e14bb325SJeff Bonwick 2841e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) 2842e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 284322fe2c88SJonathan Adams 284422fe2c88SJonathan Adams /* 284522fe2c88SJonathan Adams * Here is a possibly good place to attempt to do 284622fe2c88SJonathan Adams * either combinatorial reconstruction or error correction 284722fe2c88SJonathan Adams * based on checksums. It also might be a good place 284822fe2c88SJonathan Adams * to send out preliminary ereports before we suspend 284922fe2c88SJonathan Adams * processing. 285022fe2c88SJonathan Adams */ 2851d63d470bSgw } 2852d63d470bSgw 285367bd71c6Sperrin /* 2854e14bb325SJeff Bonwick * If there were logical child errors, they apply to us now. 2855e14bb325SJeff Bonwick * We defer this until now to avoid conflating logical child 2856e14bb325SJeff Bonwick * errors with errors that happened to the zio itself when 2857e14bb325SJeff Bonwick * updating vdev stats and reporting FMA events above. 285867bd71c6Sperrin */ 2859e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); 28608654d025Sperrin 2861b24ab676SJeff Bonwick if ((zio->io_error || zio->io_reexecute) && 2862b24ab676SJeff Bonwick IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && 2863b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REWRITE)) 2864f5383399SBill Moore zio_dva_unallocate(zio, zio->io_gang_tree, bp); 2865f5383399SBill Moore 2866f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 2867f5383399SBill Moore 286833a372edSGeorge Wilson /* 286933a372edSGeorge Wilson * Godfather I/Os should never suspend. 287033a372edSGeorge Wilson */ 287133a372edSGeorge Wilson if ((zio->io_flags & ZIO_FLAG_GODFATHER) && 287233a372edSGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) 287333a372edSGeorge Wilson zio->io_reexecute = 0; 287433a372edSGeorge Wilson 287533a372edSGeorge Wilson if (zio->io_reexecute) { 2876e14bb325SJeff Bonwick /* 2877e14bb325SJeff Bonwick * This is a logical I/O that wants to reexecute. 2878e14bb325SJeff Bonwick * 2879e14bb325SJeff Bonwick * Reexecute is top-down. When an i/o fails, if it's not 2880e14bb325SJeff Bonwick * the root, it simply notifies its parent and sticks around. 2881e14bb325SJeff Bonwick * The parent, seeing that it still has children in zio_done(), 2882e14bb325SJeff Bonwick * does the same. This percolates all the way up to the root. 2883e14bb325SJeff Bonwick * The root i/o will reexecute or suspend the entire tree. 2884e14bb325SJeff Bonwick * 2885e14bb325SJeff Bonwick * This approach ensures that zio_reexecute() honors 2886e14bb325SJeff Bonwick * all the original i/o dependency relationships, e.g. 2887e14bb325SJeff Bonwick * parents not executing until children are ready. 2888e14bb325SJeff Bonwick */ 2889e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2890fa9e4066Sahrens 2891f5383399SBill Moore zio->io_gang_leader = NULL; 2892e14bb325SJeff Bonwick 2893a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2894a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 2895a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2896a3f829aeSBill Moore 289754d692b7SGeorge Wilson /* 289854d692b7SGeorge Wilson * "The Godfather" I/O monitors its children but is 289954d692b7SGeorge Wilson * not a true parent to them. It will track them through 290054d692b7SGeorge Wilson * the pipeline but severs its ties whenever they get into 290154d692b7SGeorge Wilson * trouble (e.g. suspended). This allows "The Godfather" 290254d692b7SGeorge Wilson * I/O to return status without blocking. 290354d692b7SGeorge Wilson */ 290454d692b7SGeorge Wilson for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 290554d692b7SGeorge Wilson zio_link_t *zl = zio->io_walk_link; 290654d692b7SGeorge Wilson pio_next = zio_walk_parents(zio); 290754d692b7SGeorge Wilson 290854d692b7SGeorge Wilson if ((pio->io_flags & ZIO_FLAG_GODFATHER) && 290954d692b7SGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { 291054d692b7SGeorge Wilson zio_remove_child(pio, zio, zl); 291154d692b7SGeorge Wilson zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 291254d692b7SGeorge Wilson } 291354d692b7SGeorge Wilson } 291454d692b7SGeorge Wilson 2915a3f829aeSBill Moore if ((pio = zio_unique_parent(zio)) != NULL) { 2916e14bb325SJeff Bonwick /* 2917e14bb325SJeff Bonwick * We're not a root i/o, so there's nothing to do 2918e14bb325SJeff Bonwick * but notify our parent. Don't propagate errors 2919e14bb325SJeff Bonwick * upward since we haven't permanently failed yet. 2920e14bb325SJeff Bonwick */ 292133a372edSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 2922e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; 2923e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2924e14bb325SJeff Bonwick } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { 2925e14bb325SJeff Bonwick /* 2926e14bb325SJeff Bonwick * We'd fail again if we reexecuted now, so suspend 2927e14bb325SJeff Bonwick * until conditions improve (e.g. device comes online). 2928e14bb325SJeff Bonwick */ 2929e14bb325SJeff Bonwick zio_suspend(spa, zio); 2930e14bb325SJeff Bonwick } else { 2931e14bb325SJeff Bonwick /* 2932e14bb325SJeff Bonwick * Reexecution is potentially a huge amount of work. 2933e14bb325SJeff Bonwick * Hand it off to the otherwise-unused claim taskq. 2934e14bb325SJeff Bonwick */ 29355aeb9474SGarrett D'Amore ASSERT(zio->io_tqent.tqent_next == NULL); 293631d7e8faSGeorge Wilson taskq_dispatch_ent( 2937e14bb325SJeff Bonwick spa->spa_zio_taskq[ZIO_TYPE_CLAIM][ZIO_TASKQ_ISSUE], 29385aeb9474SGarrett D'Amore (task_func_t *)zio_reexecute, zio, 0, 29395aeb9474SGarrett D'Amore &zio->io_tqent); 2940e14bb325SJeff Bonwick } 2941e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2942fa9e4066Sahrens } 2943fa9e4066Sahrens 2944b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 294533a372edSGeorge Wilson ASSERT(zio->io_reexecute == 0); 2946e14bb325SJeff Bonwick ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); 2947fa9e4066Sahrens 2948b24ab676SJeff Bonwick /* 2949b24ab676SJeff Bonwick * Report any checksum errors, since the I/O is complete. 2950b24ab676SJeff Bonwick */ 295122fe2c88SJonathan Adams while (zio->io_cksum_report != NULL) { 2952b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 2953b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 2954b24ab676SJeff Bonwick zcr->zcr_next = NULL; 2955b24ab676SJeff Bonwick zcr->zcr_finish(zcr, NULL); 2956b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 295722fe2c88SJonathan Adams } 295822fe2c88SJonathan Adams 2959a3f829aeSBill Moore /* 2960a3f829aeSBill Moore * It is the responsibility of the done callback to ensure that this 2961a3f829aeSBill Moore * particular zio is no longer discoverable for adoption, and as 2962a3f829aeSBill Moore * such, cannot acquire any new parents. 2963a3f829aeSBill Moore */ 2964e14bb325SJeff Bonwick if (zio->io_done) 2965e14bb325SJeff Bonwick zio->io_done(zio); 2966fa9e4066Sahrens 2967a3f829aeSBill Moore mutex_enter(&zio->io_lock); 2968a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 2969a3f829aeSBill Moore mutex_exit(&zio->io_lock); 2970fa9e4066Sahrens 2971a3f829aeSBill Moore for (pio = zio_walk_parents(zio); pio != NULL; pio = pio_next) { 2972a3f829aeSBill Moore zio_link_t *zl = zio->io_walk_link; 2973a3f829aeSBill Moore pio_next = zio_walk_parents(zio); 2974a3f829aeSBill Moore zio_remove_child(pio, zio, zl); 2975e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 2976e14bb325SJeff Bonwick } 2977fa9e4066Sahrens 2978e14bb325SJeff Bonwick if (zio->io_waiter != NULL) { 2979e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 2980e14bb325SJeff Bonwick zio->io_executor = NULL; 2981e14bb325SJeff Bonwick cv_broadcast(&zio->io_cv); 2982e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 2983e14bb325SJeff Bonwick } else { 2984e14bb325SJeff Bonwick zio_destroy(zio); 2985e14bb325SJeff Bonwick } 2986fa9e4066Sahrens 2987e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2988fa9e4066Sahrens } 298946341222Sperrin 299046341222Sperrin /* 2991e14bb325SJeff Bonwick * ========================================================================== 2992e14bb325SJeff Bonwick * I/O pipeline definition 2993e14bb325SJeff Bonwick * ========================================================================== 299446341222Sperrin */ 2995b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[] = { 2996e14bb325SJeff Bonwick NULL, 2997e14bb325SJeff Bonwick zio_read_bp_init, 2998b24ab676SJeff Bonwick zio_free_bp_init, 2999b24ab676SJeff Bonwick zio_issue_async, 3000e14bb325SJeff Bonwick zio_write_bp_init, 3001e14bb325SJeff Bonwick zio_checksum_generate, 3002b24ab676SJeff Bonwick zio_ddt_read_start, 3003b24ab676SJeff Bonwick zio_ddt_read_done, 3004b24ab676SJeff Bonwick zio_ddt_write, 3005b24ab676SJeff Bonwick zio_ddt_free, 3006e14bb325SJeff Bonwick zio_gang_assemble, 3007e14bb325SJeff Bonwick zio_gang_issue, 3008e14bb325SJeff Bonwick zio_dva_allocate, 3009e14bb325SJeff Bonwick zio_dva_free, 3010e14bb325SJeff Bonwick zio_dva_claim, 3011e14bb325SJeff Bonwick zio_ready, 3012e14bb325SJeff Bonwick zio_vdev_io_start, 3013e14bb325SJeff Bonwick zio_vdev_io_done, 3014e14bb325SJeff Bonwick zio_vdev_io_assess, 3015e14bb325SJeff Bonwick zio_checksum_verify, 3016e14bb325SJeff Bonwick zio_done 3017e14bb325SJeff Bonwick }; 3018ad135b5dSChristopher Siden 3019ad135b5dSChristopher Siden /* dnp is the dnode for zb1->zb_object */ 3020ad135b5dSChristopher Siden boolean_t 3021ad135b5dSChristopher Siden zbookmark_is_before(const dnode_phys_t *dnp, const zbookmark_t *zb1, 3022ad135b5dSChristopher Siden const zbookmark_t *zb2) 3023ad135b5dSChristopher Siden { 3024ad135b5dSChristopher Siden uint64_t zb1nextL0, zb2thisobj; 3025ad135b5dSChristopher Siden 3026ad135b5dSChristopher Siden ASSERT(zb1->zb_objset == zb2->zb_objset); 3027ad135b5dSChristopher Siden ASSERT(zb2->zb_level == 0); 3028ad135b5dSChristopher Siden 3029ad135b5dSChristopher Siden /* 3030ad135b5dSChristopher Siden * A bookmark in the deadlist is considered to be after 3031ad135b5dSChristopher Siden * everything else. 3032ad135b5dSChristopher Siden */ 3033ad135b5dSChristopher Siden if (zb2->zb_object == DMU_DEADLIST_OBJECT) 3034ad135b5dSChristopher Siden return (B_TRUE); 3035ad135b5dSChristopher Siden 3036ad135b5dSChristopher Siden /* The objset_phys_t isn't before anything. */ 3037ad135b5dSChristopher Siden if (dnp == NULL) 3038ad135b5dSChristopher Siden return (B_FALSE); 3039ad135b5dSChristopher Siden 3040ad135b5dSChristopher Siden zb1nextL0 = (zb1->zb_blkid + 1) << 3041ad135b5dSChristopher Siden ((zb1->zb_level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)); 3042ad135b5dSChristopher Siden 3043ad135b5dSChristopher Siden zb2thisobj = zb2->zb_object ? zb2->zb_object : 3044ad135b5dSChristopher Siden zb2->zb_blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT); 3045ad135b5dSChristopher Siden 3046ad135b5dSChristopher Siden if (zb1->zb_object == DMU_META_DNODE_OBJECT) { 3047ad135b5dSChristopher Siden uint64_t nextobj = zb1nextL0 * 3048ad135b5dSChristopher Siden (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT) >> DNODE_SHIFT; 3049ad135b5dSChristopher Siden return (nextobj <= zb2thisobj); 3050ad135b5dSChristopher Siden } 3051ad135b5dSChristopher Siden 3052ad135b5dSChristopher Siden if (zb1->zb_object < zb2thisobj) 3053ad135b5dSChristopher Siden return (B_TRUE); 3054ad135b5dSChristopher Siden if (zb1->zb_object > zb2thisobj) 3055ad135b5dSChristopher Siden return (B_FALSE); 3056ad135b5dSChristopher Siden if (zb2->zb_object == DMU_META_DNODE_OBJECT) 3057ad135b5dSChristopher Siden return (B_FALSE); 3058ad135b5dSChristopher Siden return (zb1nextL0 <= zb2->zb_blkid); 3059ad135b5dSChristopher Siden } 3060