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. 23*f78cdc34SPaul Dagnelie * Copyright (c) 2011, 2018 by Delphix. All rights reserved. 245aeb9474SGarrett D'Amore * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved. 25c3d26abcSMatthew Ahrens * Copyright (c) 2014 Integros [integros.com] 26fa9e4066Sahrens */ 27fa9e4066Sahrens 28de710d24SJosef 'Jeff' Sipek #include <sys/sysmacros.h> 29fa9e4066Sahrens #include <sys/zfs_context.h> 30ea8dc4b6Seschrock #include <sys/fm/fs/zfs.h> 31fa9e4066Sahrens #include <sys/spa.h> 32fa9e4066Sahrens #include <sys/txg.h> 33fa9e4066Sahrens #include <sys/spa_impl.h> 34fa9e4066Sahrens #include <sys/vdev_impl.h> 35fa9e4066Sahrens #include <sys/zio_impl.h> 36fa9e4066Sahrens #include <sys/zio_compress.h> 37fa9e4066Sahrens #include <sys/zio_checksum.h> 38b24ab676SJeff Bonwick #include <sys/dmu_objset.h> 39b24ab676SJeff Bonwick #include <sys/arc.h> 40b24ab676SJeff Bonwick #include <sys/ddt.h> 415d7b4d43SMatthew Ahrens #include <sys/blkptr.h> 4243466aaeSMax Grossman #include <sys/zfeature.h> 430f7643c7SGeorge Wilson #include <sys/metaslab_impl.h> 44770499e1SDan Kimmel #include <sys/abd.h> 45*f78cdc34SPaul Dagnelie #include <sys/cityhash.h> 46fa9e4066Sahrens 47fa9e4066Sahrens /* 48fa9e4066Sahrens * ========================================================================== 49fa9e4066Sahrens * I/O type descriptions 50fa9e4066Sahrens * ========================================================================== 51fa9e4066Sahrens */ 5269962b56SMatthew Ahrens const char *zio_type_name[ZIO_TYPES] = { 5380eb36f2SGeorge Wilson "zio_null", "zio_read", "zio_write", "zio_free", "zio_claim", 5480eb36f2SGeorge Wilson "zio_ioctl" 5580eb36f2SGeorge Wilson }; 56fa9e4066Sahrens 570f7643c7SGeorge Wilson boolean_t zio_dva_throttle_enabled = B_TRUE; 580f7643c7SGeorge Wilson 59fa9e4066Sahrens /* 60fa9e4066Sahrens * ========================================================================== 61fa9e4066Sahrens * I/O kmem caches 62fa9e4066Sahrens * ========================================================================== 63fa9e4066Sahrens */ 64ccae0b50Seschrock kmem_cache_t *zio_cache; 65a3f829aeSBill Moore kmem_cache_t *zio_link_cache; 66fa9e4066Sahrens kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 67ad23a2dbSjohansen kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT]; 68ad23a2dbSjohansen 69ad23a2dbSjohansen #ifdef _KERNEL 70ad23a2dbSjohansen extern vmem_t *zio_alloc_arena; 71ad23a2dbSjohansen #endif 72fa9e4066Sahrens 73738f37bcSGeorge Wilson #define ZIO_PIPELINE_CONTINUE 0x100 74738f37bcSGeorge Wilson #define ZIO_PIPELINE_STOP 0x101 75738f37bcSGeorge Wilson 76a2cdcdd2SPaul Dagnelie #define BP_SPANB(indblkshift, level) \ 77a2cdcdd2SPaul Dagnelie (((uint64_t)1) << ((level) * ((indblkshift) - SPA_BLKPTRSHIFT))) 78a2cdcdd2SPaul Dagnelie #define COMPARE_META_LEVEL 0x80000000ul 7901f55e48SGeorge Wilson /* 8001f55e48SGeorge Wilson * The following actions directly effect the spa's sync-to-convergence logic. 8101f55e48SGeorge Wilson * The values below define the sync pass when we start performing the action. 8201f55e48SGeorge Wilson * Care should be taken when changing these values as they directly impact 8301f55e48SGeorge Wilson * spa_sync() performance. Tuning these values may introduce subtle performance 8401f55e48SGeorge Wilson * pathologies and should only be done in the context of performance analysis. 8501f55e48SGeorge Wilson * These tunables will eventually be removed and replaced with #defines once 8601f55e48SGeorge Wilson * enough analysis has been done to determine optimal values. 8701f55e48SGeorge Wilson * 8801f55e48SGeorge Wilson * The 'zfs_sync_pass_deferred_free' pass must be greater than 1 to ensure that 8901f55e48SGeorge Wilson * regular blocks are not deferred. 9001f55e48SGeorge Wilson */ 9101f55e48SGeorge Wilson int zfs_sync_pass_deferred_free = 2; /* defer frees starting in this pass */ 9201f55e48SGeorge Wilson int zfs_sync_pass_dont_compress = 5; /* don't compress starting in this pass */ 9301f55e48SGeorge Wilson int zfs_sync_pass_rewrite = 2; /* rewrite new bps starting in this pass */ 9401f55e48SGeorge Wilson 950a4e9518Sgw /* 96e14bb325SJeff Bonwick * An allocating zio is one that either currently has the DVA allocate 97e14bb325SJeff Bonwick * stage set or will have it later in its lifetime. 980a4e9518Sgw */ 99b24ab676SJeff Bonwick #define IO_IS_ALLOCATING(zio) ((zio)->io_orig_pipeline & ZIO_STAGE_DVA_ALLOCATE) 100b24ab676SJeff Bonwick 10135a5a358SJonathan Adams boolean_t zio_requeue_io_start_cut_in_line = B_TRUE; 10235a5a358SJonathan Adams 103b24ab676SJeff Bonwick #ifdef ZFS_DEBUG 104b24ab676SJeff Bonwick int zio_buf_debug_limit = 16384; 105b24ab676SJeff Bonwick #else 106b24ab676SJeff Bonwick int zio_buf_debug_limit = 0; 107b24ab676SJeff Bonwick #endif 1080a4e9518Sgw 1090f7643c7SGeorge Wilson static void zio_taskq_dispatch(zio_t *, zio_taskq_type_t, boolean_t); 1100f7643c7SGeorge Wilson 111fa9e4066Sahrens void 112fa9e4066Sahrens zio_init(void) 113fa9e4066Sahrens { 114fa9e4066Sahrens size_t c; 115ad23a2dbSjohansen vmem_t *data_alloc_arena = NULL; 116ad23a2dbSjohansen 117ad23a2dbSjohansen #ifdef _KERNEL 118ad23a2dbSjohansen data_alloc_arena = zio_alloc_arena; 119ad23a2dbSjohansen #endif 120a3f829aeSBill Moore zio_cache = kmem_cache_create("zio_cache", 121a3f829aeSBill Moore sizeof (zio_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 122a3f829aeSBill Moore zio_link_cache = kmem_cache_create("zio_link_cache", 123a3f829aeSBill Moore sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 124ccae0b50Seschrock 125fa9e4066Sahrens /* 126fa9e4066Sahrens * For small buffers, we want a cache for each multiple of 127b5152584SMatthew Ahrens * SPA_MINBLOCKSIZE. For larger buffers, we want a cache 128b5152584SMatthew Ahrens * for each quarter-power of 2. 129fa9e4066Sahrens */ 130fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 131fa9e4066Sahrens size_t size = (c + 1) << SPA_MINBLOCKSHIFT; 132fa9e4066Sahrens size_t p2 = size; 133fa9e4066Sahrens size_t align = 0; 134e291592aSJonathan Adams size_t cflags = (size > zio_buf_debug_limit) ? KMC_NODEBUG : 0; 135fa9e4066Sahrens 136de710d24SJosef 'Jeff' Sipek while (!ISP2(p2)) 137fa9e4066Sahrens p2 &= p2 - 1; 138fa9e4066Sahrens 139cd1c8b85SMatthew Ahrens #ifndef _KERNEL 140cd1c8b85SMatthew Ahrens /* 141cd1c8b85SMatthew Ahrens * If we are using watchpoints, put each buffer on its own page, 142cd1c8b85SMatthew Ahrens * to eliminate the performance overhead of trapping to the 143cd1c8b85SMatthew Ahrens * kernel when modifying a non-watched buffer that shares the 144cd1c8b85SMatthew Ahrens * page with a watched buffer. 145cd1c8b85SMatthew Ahrens */ 146cd1c8b85SMatthew Ahrens if (arc_watch && !IS_P2ALIGNED(size, PAGESIZE)) 147cd1c8b85SMatthew Ahrens continue; 148cd1c8b85SMatthew Ahrens #endif 149fa9e4066Sahrens if (size <= 4 * SPA_MINBLOCKSIZE) { 150fa9e4066Sahrens align = SPA_MINBLOCKSIZE; 151cd1c8b85SMatthew Ahrens } else if (IS_P2ALIGNED(size, p2 >> 2)) { 152b5152584SMatthew Ahrens align = MIN(p2 >> 2, PAGESIZE); 153fa9e4066Sahrens } 154fa9e4066Sahrens 155fa9e4066Sahrens if (align != 0) { 156ad23a2dbSjohansen char name[36]; 1575ad82045Snd (void) sprintf(name, "zio_buf_%lu", (ulong_t)size); 158fa9e4066Sahrens zio_buf_cache[c] = kmem_cache_create(name, size, 159e291592aSJonathan Adams align, NULL, NULL, NULL, NULL, NULL, cflags); 160ad23a2dbSjohansen 161e291592aSJonathan Adams /* 162e291592aSJonathan Adams * Since zio_data bufs do not appear in crash dumps, we 163e291592aSJonathan Adams * pass KMC_NOTOUCH so that no allocator metadata is 164e291592aSJonathan Adams * stored with the buffers. 165e291592aSJonathan Adams */ 166ad23a2dbSjohansen (void) sprintf(name, "zio_data_buf_%lu", (ulong_t)size); 167ad23a2dbSjohansen zio_data_buf_cache[c] = kmem_cache_create(name, size, 168ad23a2dbSjohansen align, NULL, NULL, NULL, NULL, data_alloc_arena, 169e291592aSJonathan Adams cflags | KMC_NOTOUCH); 170fa9e4066Sahrens } 171fa9e4066Sahrens } 172fa9e4066Sahrens 173fa9e4066Sahrens while (--c != 0) { 174fa9e4066Sahrens ASSERT(zio_buf_cache[c] != NULL); 175fa9e4066Sahrens if (zio_buf_cache[c - 1] == NULL) 176fa9e4066Sahrens zio_buf_cache[c - 1] = zio_buf_cache[c]; 177ad23a2dbSjohansen 178ad23a2dbSjohansen ASSERT(zio_data_buf_cache[c] != NULL); 179ad23a2dbSjohansen if (zio_data_buf_cache[c - 1] == NULL) 180ad23a2dbSjohansen zio_data_buf_cache[c - 1] = zio_data_buf_cache[c]; 181fa9e4066Sahrens } 182ea8dc4b6Seschrock 183ea8dc4b6Seschrock zio_inject_init(); 184fa9e4066Sahrens } 185fa9e4066Sahrens 186fa9e4066Sahrens void 187fa9e4066Sahrens zio_fini(void) 188fa9e4066Sahrens { 189fa9e4066Sahrens size_t c; 190fa9e4066Sahrens kmem_cache_t *last_cache = NULL; 191ad23a2dbSjohansen kmem_cache_t *last_data_cache = NULL; 192fa9e4066Sahrens 193fa9e4066Sahrens for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) { 194fa9e4066Sahrens if (zio_buf_cache[c] != last_cache) { 195fa9e4066Sahrens last_cache = zio_buf_cache[c]; 196fa9e4066Sahrens kmem_cache_destroy(zio_buf_cache[c]); 197fa9e4066Sahrens } 198fa9e4066Sahrens zio_buf_cache[c] = NULL; 199ad23a2dbSjohansen 200ad23a2dbSjohansen if (zio_data_buf_cache[c] != last_data_cache) { 201ad23a2dbSjohansen last_data_cache = zio_data_buf_cache[c]; 202ad23a2dbSjohansen kmem_cache_destroy(zio_data_buf_cache[c]); 203ad23a2dbSjohansen } 204ad23a2dbSjohansen zio_data_buf_cache[c] = NULL; 205fa9e4066Sahrens } 206ea8dc4b6Seschrock 207a3f829aeSBill Moore kmem_cache_destroy(zio_link_cache); 208ccae0b50Seschrock kmem_cache_destroy(zio_cache); 209ccae0b50Seschrock 210ea8dc4b6Seschrock zio_inject_fini(); 211fa9e4066Sahrens } 212fa9e4066Sahrens 213fa9e4066Sahrens /* 214fa9e4066Sahrens * ========================================================================== 215fa9e4066Sahrens * Allocate and free I/O buffers 216fa9e4066Sahrens * ========================================================================== 217fa9e4066Sahrens */ 218ad23a2dbSjohansen 219ad23a2dbSjohansen /* 220ad23a2dbSjohansen * Use zio_buf_alloc to allocate ZFS metadata. This data will appear in a 221ad23a2dbSjohansen * crashdump if the kernel panics, so use it judiciously. Obviously, it's 222ad23a2dbSjohansen * useful to inspect ZFS metadata, but if possible, we should avoid keeping 223ad23a2dbSjohansen * excess / transient data in-core during a crashdump. 224ad23a2dbSjohansen */ 225fa9e4066Sahrens void * 226fa9e4066Sahrens zio_buf_alloc(size_t size) 227fa9e4066Sahrens { 228fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 229fa9e4066Sahrens 230f63ab3d5SMatthew Ahrens VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 231fa9e4066Sahrens 2321ab7f2deSmaybee return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE)); 233fa9e4066Sahrens } 234fa9e4066Sahrens 235ad23a2dbSjohansen /* 236ad23a2dbSjohansen * Use zio_data_buf_alloc to allocate data. The data will not appear in a 237ad23a2dbSjohansen * crashdump if the kernel panics. This exists so that we will limit the amount 238ad23a2dbSjohansen * of ZFS data that shows up in a kernel crashdump. (Thus reducing the amount 239ad23a2dbSjohansen * of kernel heap dumped to disk when the kernel panics) 240ad23a2dbSjohansen */ 241ad23a2dbSjohansen void * 242ad23a2dbSjohansen zio_data_buf_alloc(size_t size) 243ad23a2dbSjohansen { 244ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 245ad23a2dbSjohansen 246f63ab3d5SMatthew Ahrens VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 247ad23a2dbSjohansen 2481ab7f2deSmaybee return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE)); 249ad23a2dbSjohansen } 250ad23a2dbSjohansen 251fa9e4066Sahrens void 252fa9e4066Sahrens zio_buf_free(void *buf, size_t size) 253fa9e4066Sahrens { 254fa9e4066Sahrens size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 255fa9e4066Sahrens 256f63ab3d5SMatthew Ahrens VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 257fa9e4066Sahrens 258fa9e4066Sahrens kmem_cache_free(zio_buf_cache[c], buf); 259fa9e4066Sahrens } 260fa9e4066Sahrens 261ad23a2dbSjohansen void 262ad23a2dbSjohansen zio_data_buf_free(void *buf, size_t size) 263ad23a2dbSjohansen { 264ad23a2dbSjohansen size_t c = (size - 1) >> SPA_MINBLOCKSHIFT; 265ad23a2dbSjohansen 266f63ab3d5SMatthew Ahrens VERIFY3U(c, <, SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT); 267ad23a2dbSjohansen 268ad23a2dbSjohansen kmem_cache_free(zio_data_buf_cache[c], buf); 269ad23a2dbSjohansen } 270b3995adbSahrens 271fa9e4066Sahrens /* 272fa9e4066Sahrens * ========================================================================== 273fa9e4066Sahrens * Push and pop I/O transform buffers 274fa9e4066Sahrens * ========================================================================== 275fa9e4066Sahrens */ 276dcbf3bd6SGeorge Wilson void 277770499e1SDan Kimmel zio_push_transform(zio_t *zio, abd_t *data, uint64_t size, uint64_t bufsize, 2789a686fbcSPaul Dagnelie zio_transform_func_t *transform) 279fa9e4066Sahrens { 280fa9e4066Sahrens zio_transform_t *zt = kmem_alloc(sizeof (zio_transform_t), KM_SLEEP); 281fa9e4066Sahrens 282770499e1SDan Kimmel /* 283770499e1SDan Kimmel * Ensure that anyone expecting this zio to contain a linear ABD isn't 284770499e1SDan Kimmel * going to get a nasty surprise when they try to access the data. 285770499e1SDan Kimmel */ 286770499e1SDan Kimmel IMPLY(abd_is_linear(zio->io_abd), abd_is_linear(data)); 287770499e1SDan Kimmel 288770499e1SDan Kimmel zt->zt_orig_abd = zio->io_abd; 289e14bb325SJeff Bonwick zt->zt_orig_size = zio->io_size; 290fa9e4066Sahrens zt->zt_bufsize = bufsize; 291e14bb325SJeff Bonwick zt->zt_transform = transform; 292fa9e4066Sahrens 293fa9e4066Sahrens zt->zt_next = zio->io_transform_stack; 294fa9e4066Sahrens zio->io_transform_stack = zt; 295fa9e4066Sahrens 296770499e1SDan Kimmel zio->io_abd = data; 297fa9e4066Sahrens zio->io_size = size; 298fa9e4066Sahrens } 299fa9e4066Sahrens 300dcbf3bd6SGeorge Wilson void 301e14bb325SJeff Bonwick zio_pop_transforms(zio_t *zio) 302fa9e4066Sahrens { 303e14bb325SJeff Bonwick zio_transform_t *zt; 304e14bb325SJeff Bonwick 305e14bb325SJeff Bonwick while ((zt = zio->io_transform_stack) != NULL) { 306e14bb325SJeff Bonwick if (zt->zt_transform != NULL) 307e14bb325SJeff Bonwick zt->zt_transform(zio, 308770499e1SDan Kimmel zt->zt_orig_abd, zt->zt_orig_size); 309fa9e4066Sahrens 310b24ab676SJeff Bonwick if (zt->zt_bufsize != 0) 311770499e1SDan Kimmel abd_free(zio->io_abd); 312fa9e4066Sahrens 313770499e1SDan Kimmel zio->io_abd = zt->zt_orig_abd; 314e14bb325SJeff Bonwick zio->io_size = zt->zt_orig_size; 315e14bb325SJeff Bonwick zio->io_transform_stack = zt->zt_next; 316fa9e4066Sahrens 317e14bb325SJeff Bonwick kmem_free(zt, sizeof (zio_transform_t)); 318fa9e4066Sahrens } 319fa9e4066Sahrens } 320fa9e4066Sahrens 321e14bb325SJeff Bonwick /* 322e14bb325SJeff Bonwick * ========================================================================== 323e14bb325SJeff Bonwick * I/O transform callbacks for subblocks and decompression 324e14bb325SJeff Bonwick * ========================================================================== 325e14bb325SJeff Bonwick */ 326e14bb325SJeff Bonwick static void 327770499e1SDan Kimmel zio_subblock(zio_t *zio, abd_t *data, uint64_t size) 328e14bb325SJeff Bonwick { 329e14bb325SJeff Bonwick ASSERT(zio->io_size > size); 330e14bb325SJeff Bonwick 331e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_READ) 332770499e1SDan Kimmel abd_copy(data, zio->io_abd, size); 333e14bb325SJeff Bonwick } 334e14bb325SJeff Bonwick 335e14bb325SJeff Bonwick static void 336770499e1SDan Kimmel zio_decompress(zio_t *zio, abd_t *data, uint64_t size) 337e14bb325SJeff Bonwick { 338770499e1SDan Kimmel if (zio->io_error == 0) { 339770499e1SDan Kimmel void *tmp = abd_borrow_buf(data, size); 340770499e1SDan Kimmel int ret = zio_decompress_data(BP_GET_COMPRESS(zio->io_bp), 341770499e1SDan Kimmel zio->io_abd, tmp, zio->io_size, size); 342770499e1SDan Kimmel abd_return_buf_copy(data, tmp, size); 343770499e1SDan Kimmel 344770499e1SDan Kimmel if (ret != 0) 345770499e1SDan Kimmel zio->io_error = SET_ERROR(EIO); 346770499e1SDan Kimmel } 347e14bb325SJeff Bonwick } 348e14bb325SJeff Bonwick 349e14bb325SJeff Bonwick /* 350e14bb325SJeff Bonwick * ========================================================================== 351e14bb325SJeff Bonwick * I/O parent/child relationships and pipeline interlocks 352e14bb325SJeff Bonwick * ========================================================================== 353e14bb325SJeff Bonwick */ 354a3f829aeSBill Moore zio_t * 3550f7643c7SGeorge Wilson zio_walk_parents(zio_t *cio, zio_link_t **zl) 356a3f829aeSBill Moore { 357a3f829aeSBill Moore list_t *pl = &cio->io_parent_list; 358e14bb325SJeff Bonwick 3590f7643c7SGeorge Wilson *zl = (*zl == NULL) ? list_head(pl) : list_next(pl, *zl); 3600f7643c7SGeorge Wilson if (*zl == NULL) 361a3f829aeSBill Moore return (NULL); 362a3f829aeSBill Moore 3630f7643c7SGeorge Wilson ASSERT((*zl)->zl_child == cio); 3640f7643c7SGeorge Wilson return ((*zl)->zl_parent); 365a3f829aeSBill Moore } 366a3f829aeSBill Moore 367a3f829aeSBill Moore zio_t * 3680f7643c7SGeorge Wilson zio_walk_children(zio_t *pio, zio_link_t **zl) 369a3f829aeSBill Moore { 370a3f829aeSBill Moore list_t *cl = &pio->io_child_list; 371a3f829aeSBill Moore 3720f7643c7SGeorge Wilson *zl = (*zl == NULL) ? list_head(cl) : list_next(cl, *zl); 3730f7643c7SGeorge Wilson if (*zl == NULL) 374a3f829aeSBill Moore return (NULL); 375a3f829aeSBill Moore 3760f7643c7SGeorge Wilson ASSERT((*zl)->zl_parent == pio); 3770f7643c7SGeorge Wilson return ((*zl)->zl_child); 378a3f829aeSBill Moore } 379a3f829aeSBill Moore 380a3f829aeSBill Moore zio_t * 381a3f829aeSBill Moore zio_unique_parent(zio_t *cio) 382a3f829aeSBill Moore { 3830f7643c7SGeorge Wilson zio_link_t *zl = NULL; 3840f7643c7SGeorge Wilson zio_t *pio = zio_walk_parents(cio, &zl); 385a3f829aeSBill Moore 3860f7643c7SGeorge Wilson VERIFY3P(zio_walk_parents(cio, &zl), ==, NULL); 387a3f829aeSBill Moore return (pio); 388a3f829aeSBill Moore } 389a3f829aeSBill Moore 390a3f829aeSBill Moore void 391a3f829aeSBill Moore zio_add_child(zio_t *pio, zio_t *cio) 392e14bb325SJeff Bonwick { 393a3f829aeSBill Moore zio_link_t *zl = kmem_cache_alloc(zio_link_cache, KM_SLEEP); 394a3f829aeSBill Moore 395a3f829aeSBill Moore /* 396a3f829aeSBill Moore * Logical I/Os can have logical, gang, or vdev children. 397a3f829aeSBill Moore * Gang I/Os can have gang or vdev children. 398a3f829aeSBill Moore * Vdev I/Os can only have vdev children. 399a3f829aeSBill Moore * The following ASSERT captures all of these constraints. 400a3f829aeSBill Moore */ 4011271e4b1SPrakash Surya ASSERT3S(cio->io_child_type, <=, pio->io_child_type); 402a3f829aeSBill Moore 403a3f829aeSBill Moore zl->zl_parent = pio; 404a3f829aeSBill Moore zl->zl_child = cio; 405a3f829aeSBill Moore 406a3f829aeSBill Moore mutex_enter(&cio->io_lock); 407e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 408a3f829aeSBill Moore 409a3f829aeSBill Moore ASSERT(pio->io_state[ZIO_WAIT_DONE] == 0); 410a3f829aeSBill Moore 411a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 412a3f829aeSBill Moore pio->io_children[cio->io_child_type][w] += !cio->io_state[w]; 413a3f829aeSBill Moore 414a3f829aeSBill Moore list_insert_head(&pio->io_child_list, zl); 415a3f829aeSBill Moore list_insert_head(&cio->io_parent_list, zl); 416a3f829aeSBill Moore 417b24ab676SJeff Bonwick pio->io_child_count++; 418b24ab676SJeff Bonwick cio->io_parent_count++; 419b24ab676SJeff Bonwick 420e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 421a3f829aeSBill Moore mutex_exit(&cio->io_lock); 422e14bb325SJeff Bonwick } 423e14bb325SJeff Bonwick 424fa9e4066Sahrens static void 425a3f829aeSBill Moore zio_remove_child(zio_t *pio, zio_t *cio, zio_link_t *zl) 426e14bb325SJeff Bonwick { 427a3f829aeSBill Moore ASSERT(zl->zl_parent == pio); 428a3f829aeSBill Moore ASSERT(zl->zl_child == cio); 429e14bb325SJeff Bonwick 430a3f829aeSBill Moore mutex_enter(&cio->io_lock); 431e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 432a3f829aeSBill Moore 433a3f829aeSBill Moore list_remove(&pio->io_child_list, zl); 434a3f829aeSBill Moore list_remove(&cio->io_parent_list, zl); 435a3f829aeSBill Moore 436b24ab676SJeff Bonwick pio->io_child_count--; 437b24ab676SJeff Bonwick cio->io_parent_count--; 438b24ab676SJeff Bonwick 439e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 440a3f829aeSBill Moore mutex_exit(&cio->io_lock); 441a3f829aeSBill Moore 442a3f829aeSBill Moore kmem_cache_free(zio_link_cache, zl); 443e14bb325SJeff Bonwick } 444e14bb325SJeff Bonwick 445e14bb325SJeff Bonwick static boolean_t 446d6e1c446SGeorge Wilson zio_wait_for_children(zio_t *zio, uint8_t childbits, enum zio_wait_type wait) 447fa9e4066Sahrens { 448e14bb325SJeff Bonwick boolean_t waiting = B_FALSE; 449e14bb325SJeff Bonwick 450e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 451e14bb325SJeff Bonwick ASSERT(zio->io_stall == NULL); 452d6e1c446SGeorge Wilson for (int c = 0; c < ZIO_CHILD_TYPES; c++) { 453d6e1c446SGeorge Wilson if (!(ZIO_CHILD_BIT_IS_SET(childbits, c))) 454d6e1c446SGeorge Wilson continue; 455d6e1c446SGeorge Wilson 456d6e1c446SGeorge Wilson uint64_t *countp = &zio->io_children[c][wait]; 457d6e1c446SGeorge Wilson if (*countp != 0) { 458d6e1c446SGeorge Wilson zio->io_stage >>= 1; 459d6e1c446SGeorge Wilson ASSERT3U(zio->io_stage, !=, ZIO_STAGE_OPEN); 460d6e1c446SGeorge Wilson zio->io_stall = countp; 461d6e1c446SGeorge Wilson waiting = B_TRUE; 462d6e1c446SGeorge Wilson break; 463d6e1c446SGeorge Wilson } 464e14bb325SJeff Bonwick } 465e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 466e14bb325SJeff Bonwick return (waiting); 467e14bb325SJeff Bonwick } 468fa9e4066Sahrens 469e14bb325SJeff Bonwick static void 470e14bb325SJeff Bonwick zio_notify_parent(zio_t *pio, zio_t *zio, enum zio_wait_type wait) 471e14bb325SJeff Bonwick { 472e14bb325SJeff Bonwick uint64_t *countp = &pio->io_children[zio->io_child_type][wait]; 473e14bb325SJeff Bonwick int *errorp = &pio->io_child_error[zio->io_child_type]; 474fa9e4066Sahrens 475e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 476e14bb325SJeff Bonwick if (zio->io_error && !(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 477e14bb325SJeff Bonwick *errorp = zio_worst_error(*errorp, zio->io_error); 478e14bb325SJeff Bonwick pio->io_reexecute |= zio->io_reexecute; 479e14bb325SJeff Bonwick ASSERT3U(*countp, >, 0); 48069962b56SMatthew Ahrens 48169962b56SMatthew Ahrens (*countp)--; 48269962b56SMatthew Ahrens 48369962b56SMatthew Ahrens if (*countp == 0 && pio->io_stall == countp) { 4840f7643c7SGeorge Wilson zio_taskq_type_t type = 4850f7643c7SGeorge Wilson pio->io_stage < ZIO_STAGE_VDEV_IO_START ? ZIO_TASKQ_ISSUE : 4860f7643c7SGeorge Wilson ZIO_TASKQ_INTERRUPT; 487e14bb325SJeff Bonwick pio->io_stall = NULL; 488e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 4890f7643c7SGeorge Wilson /* 4900f7643c7SGeorge Wilson * Dispatch the parent zio in its own taskq so that 4910f7643c7SGeorge Wilson * the child can continue to make progress. This also 4920f7643c7SGeorge Wilson * prevents overflowing the stack when we have deeply nested 4930f7643c7SGeorge Wilson * parent-child relationships. 4940f7643c7SGeorge Wilson */ 4950f7643c7SGeorge Wilson zio_taskq_dispatch(pio, type, B_FALSE); 496e14bb325SJeff Bonwick } else { 497e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 498fa9e4066Sahrens } 499fa9e4066Sahrens } 500fa9e4066Sahrens 501e14bb325SJeff Bonwick static void 502e14bb325SJeff Bonwick zio_inherit_child_errors(zio_t *zio, enum zio_child c) 503e14bb325SJeff Bonwick { 504e14bb325SJeff Bonwick if (zio->io_child_error[c] != 0 && zio->io_error == 0) 505e14bb325SJeff Bonwick zio->io_error = zio->io_child_error[c]; 506e14bb325SJeff Bonwick } 507e14bb325SJeff Bonwick 5080f7643c7SGeorge Wilson int 50994c2d0ebSMatthew Ahrens zio_bookmark_compare(const void *x1, const void *x2) 5100f7643c7SGeorge Wilson { 5110f7643c7SGeorge Wilson const zio_t *z1 = x1; 5120f7643c7SGeorge Wilson const zio_t *z2 = x2; 5130f7643c7SGeorge Wilson 51494c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_objset < z2->io_bookmark.zb_objset) 5150f7643c7SGeorge Wilson return (-1); 51694c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_objset > z2->io_bookmark.zb_objset) 5170f7643c7SGeorge Wilson return (1); 5180f7643c7SGeorge Wilson 51994c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_object < z2->io_bookmark.zb_object) 5200f7643c7SGeorge Wilson return (-1); 52194c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_object > z2->io_bookmark.zb_object) 52294c2d0ebSMatthew Ahrens return (1); 52394c2d0ebSMatthew Ahrens 52494c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_level < z2->io_bookmark.zb_level) 52594c2d0ebSMatthew Ahrens return (-1); 52694c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_level > z2->io_bookmark.zb_level) 52794c2d0ebSMatthew Ahrens return (1); 52894c2d0ebSMatthew Ahrens 52994c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_blkid < z2->io_bookmark.zb_blkid) 53094c2d0ebSMatthew Ahrens return (-1); 53194c2d0ebSMatthew Ahrens if (z1->io_bookmark.zb_blkid > z2->io_bookmark.zb_blkid) 5320f7643c7SGeorge Wilson return (1); 5330f7643c7SGeorge Wilson 5340f7643c7SGeorge Wilson if (z1 < z2) 5350f7643c7SGeorge Wilson return (-1); 5360f7643c7SGeorge Wilson if (z1 > z2) 5370f7643c7SGeorge Wilson return (1); 5380f7643c7SGeorge Wilson 5390f7643c7SGeorge Wilson return (0); 5400f7643c7SGeorge Wilson } 5410f7643c7SGeorge Wilson 542fa9e4066Sahrens /* 543fa9e4066Sahrens * ========================================================================== 544e14bb325SJeff Bonwick * Create the various types of I/O (read, write, free, etc) 545fa9e4066Sahrens * ========================================================================== 546fa9e4066Sahrens */ 547fa9e4066Sahrens static zio_t * 548b24ab676SJeff Bonwick zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 549770499e1SDan Kimmel abd_t *data, uint64_t lsize, uint64_t psize, zio_done_func_t *done, 5505602294fSDan Kimmel void *private, zio_type_t type, zio_priority_t priority, 5515602294fSDan Kimmel enum zio_flag flags, vdev_t *vd, uint64_t offset, 5525602294fSDan Kimmel const zbookmark_phys_t *zb, enum zio_stage stage, enum zio_stage pipeline) 553fa9e4066Sahrens { 554fa9e4066Sahrens zio_t *zio; 555fa9e4066Sahrens 5565602294fSDan Kimmel ASSERT3U(psize, <=, SPA_MAXBLOCKSIZE); 5575602294fSDan Kimmel ASSERT(P2PHASE(psize, SPA_MINBLOCKSIZE) == 0); 558e14bb325SJeff Bonwick ASSERT(P2PHASE(offset, SPA_MINBLOCKSIZE) == 0); 559fa9e4066Sahrens 560e14bb325SJeff Bonwick ASSERT(!vd || spa_config_held(spa, SCL_STATE_ALL, RW_READER)); 561e14bb325SJeff Bonwick ASSERT(!bp || !(flags & ZIO_FLAG_CONFIG_WRITER)); 562e14bb325SJeff Bonwick ASSERT(vd || stage == ZIO_STAGE_OPEN); 563088f3894Sahrens 5645602294fSDan Kimmel IMPLY(lsize != psize, (flags & ZIO_FLAG_RAW) != 0); 5655602294fSDan Kimmel 566ccae0b50Seschrock zio = kmem_cache_alloc(zio_cache, KM_SLEEP); 567ccae0b50Seschrock bzero(zio, sizeof (zio_t)); 568e14bb325SJeff Bonwick 569e14bb325SJeff Bonwick mutex_init(&zio->io_lock, NULL, MUTEX_DEFAULT, NULL); 570e14bb325SJeff Bonwick cv_init(&zio->io_cv, NULL, CV_DEFAULT, NULL); 571e14bb325SJeff Bonwick 572a3f829aeSBill Moore list_create(&zio->io_parent_list, sizeof (zio_link_t), 573a3f829aeSBill Moore offsetof(zio_link_t, zl_parent_node)); 574a3f829aeSBill Moore list_create(&zio->io_child_list, sizeof (zio_link_t), 575a3f829aeSBill Moore offsetof(zio_link_t, zl_child_node)); 5768363e80aSGeorge Wilson metaslab_trace_init(&zio->io_alloc_list); 577a3f829aeSBill Moore 578e14bb325SJeff Bonwick if (vd != NULL) 579e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_VDEV; 580e14bb325SJeff Bonwick else if (flags & ZIO_FLAG_GANG_CHILD) 581e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_GANG; 582b24ab676SJeff Bonwick else if (flags & ZIO_FLAG_DDT_CHILD) 583b24ab676SJeff Bonwick zio->io_child_type = ZIO_CHILD_DDT; 584e14bb325SJeff Bonwick else 585e14bb325SJeff Bonwick zio->io_child_type = ZIO_CHILD_LOGICAL; 586e14bb325SJeff Bonwick 587fa9e4066Sahrens if (bp != NULL) { 588b24ab676SJeff Bonwick zio->io_bp = (blkptr_t *)bp; 589fa9e4066Sahrens zio->io_bp_copy = *bp; 590fa9e4066Sahrens zio->io_bp_orig = *bp; 591b24ab676SJeff Bonwick if (type != ZIO_TYPE_WRITE || 592b24ab676SJeff Bonwick zio->io_child_type == ZIO_CHILD_DDT) 593e14bb325SJeff Bonwick zio->io_bp = &zio->io_bp_copy; /* so caller can free */ 594f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL) 595e14bb325SJeff Bonwick zio->io_logical = zio; 596f5383399SBill Moore if (zio->io_child_type > ZIO_CHILD_GANG && BP_IS_GANG(bp)) 597f5383399SBill Moore pipeline |= ZIO_GANG_STAGES; 598fa9e4066Sahrens } 599e14bb325SJeff Bonwick 600e14bb325SJeff Bonwick zio->io_spa = spa; 601e14bb325SJeff Bonwick zio->io_txg = txg; 602fa9e4066Sahrens zio->io_done = done; 603fa9e4066Sahrens zio->io_private = private; 604fa9e4066Sahrens zio->io_type = type; 605fa9e4066Sahrens zio->io_priority = priority; 606e14bb325SJeff Bonwick zio->io_vd = vd; 607e14bb325SJeff Bonwick zio->io_offset = offset; 608770499e1SDan Kimmel zio->io_orig_abd = zio->io_abd = data; 6095602294fSDan Kimmel zio->io_orig_size = zio->io_size = psize; 6105602294fSDan Kimmel zio->io_lsize = lsize; 611e14bb325SJeff Bonwick zio->io_orig_flags = zio->io_flags = flags; 612e14bb325SJeff Bonwick zio->io_orig_stage = zio->io_stage = stage; 613e14bb325SJeff Bonwick zio->io_orig_pipeline = zio->io_pipeline = pipeline; 6140f7643c7SGeorge Wilson zio->io_pipeline_trace = ZIO_STAGE_OPEN; 615fa9e4066Sahrens 616a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = (stage >= ZIO_STAGE_READY); 617a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = (stage >= ZIO_STAGE_DONE); 618a3f829aeSBill Moore 619e14bb325SJeff Bonwick if (zb != NULL) 620e14bb325SJeff Bonwick zio->io_bookmark = *zb; 621e14bb325SJeff Bonwick 622e14bb325SJeff Bonwick if (pio != NULL) { 623e14bb325SJeff Bonwick if (zio->io_logical == NULL) 624ea8dc4b6Seschrock zio->io_logical = pio->io_logical; 625f5383399SBill Moore if (zio->io_child_type == ZIO_CHILD_GANG) 626f5383399SBill Moore zio->io_gang_leader = pio->io_gang_leader; 627e14bb325SJeff Bonwick zio_add_child(pio, zio); 628fa9e4066Sahrens } 629fa9e4066Sahrens 630fa9e4066Sahrens return (zio); 631fa9e4066Sahrens } 632fa9e4066Sahrens 6330a4e9518Sgw static void 634e14bb325SJeff Bonwick zio_destroy(zio_t *zio) 6350a4e9518Sgw { 6368363e80aSGeorge Wilson metaslab_trace_fini(&zio->io_alloc_list); 637a3f829aeSBill Moore list_destroy(&zio->io_parent_list); 638a3f829aeSBill Moore list_destroy(&zio->io_child_list); 639e14bb325SJeff Bonwick mutex_destroy(&zio->io_lock); 640e14bb325SJeff Bonwick cv_destroy(&zio->io_cv); 641e14bb325SJeff Bonwick kmem_cache_free(zio_cache, zio); 6420a4e9518Sgw } 6430a4e9518Sgw 644fa9e4066Sahrens zio_t * 645a3f829aeSBill Moore zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, zio_done_func_t *done, 646b24ab676SJeff Bonwick void *private, enum zio_flag flags) 647fa9e4066Sahrens { 648fa9e4066Sahrens zio_t *zio; 649fa9e4066Sahrens 6505602294fSDan Kimmel zio = zio_create(pio, spa, 0, NULL, NULL, 0, 0, done, private, 651a3f829aeSBill Moore ZIO_TYPE_NULL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 652e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_INTERLOCK_PIPELINE); 653fa9e4066Sahrens 654fa9e4066Sahrens return (zio); 655fa9e4066Sahrens } 656fa9e4066Sahrens 657fa9e4066Sahrens zio_t * 658b24ab676SJeff Bonwick zio_root(spa_t *spa, zio_done_func_t *done, void *private, enum zio_flag flags) 659fa9e4066Sahrens { 660a3f829aeSBill Moore return (zio_null(NULL, spa, NULL, done, private, flags)); 661fa9e4066Sahrens } 662fa9e4066Sahrens 663f63ab3d5SMatthew Ahrens void 664f63ab3d5SMatthew Ahrens zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp) 665f63ab3d5SMatthew Ahrens { 666f63ab3d5SMatthew Ahrens if (!DMU_OT_IS_VALID(BP_GET_TYPE(bp))) { 667f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p has invalid TYPE %llu", 668f63ab3d5SMatthew Ahrens bp, (longlong_t)BP_GET_TYPE(bp)); 669f63ab3d5SMatthew Ahrens } 670f63ab3d5SMatthew Ahrens if (BP_GET_CHECKSUM(bp) >= ZIO_CHECKSUM_FUNCTIONS || 671f63ab3d5SMatthew Ahrens BP_GET_CHECKSUM(bp) <= ZIO_CHECKSUM_ON) { 672f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p has invalid CHECKSUM %llu", 673f63ab3d5SMatthew Ahrens bp, (longlong_t)BP_GET_CHECKSUM(bp)); 674f63ab3d5SMatthew Ahrens } 675f63ab3d5SMatthew Ahrens if (BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_FUNCTIONS || 676f63ab3d5SMatthew Ahrens BP_GET_COMPRESS(bp) <= ZIO_COMPRESS_ON) { 677f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p has invalid COMPRESS %llu", 678f63ab3d5SMatthew Ahrens bp, (longlong_t)BP_GET_COMPRESS(bp)); 679f63ab3d5SMatthew Ahrens } 680f63ab3d5SMatthew Ahrens if (BP_GET_LSIZE(bp) > SPA_MAXBLOCKSIZE) { 681f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p has invalid LSIZE %llu", 682f63ab3d5SMatthew Ahrens bp, (longlong_t)BP_GET_LSIZE(bp)); 683f63ab3d5SMatthew Ahrens } 684f63ab3d5SMatthew Ahrens if (BP_GET_PSIZE(bp) > SPA_MAXBLOCKSIZE) { 685f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p has invalid PSIZE %llu", 686f63ab3d5SMatthew Ahrens bp, (longlong_t)BP_GET_PSIZE(bp)); 687f63ab3d5SMatthew Ahrens } 688f63ab3d5SMatthew Ahrens 689f63ab3d5SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) { 690f63ab3d5SMatthew Ahrens if (BPE_GET_ETYPE(bp) > NUM_BP_EMBEDDED_TYPES) { 691f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p has invalid ETYPE %llu", 692f63ab3d5SMatthew Ahrens bp, (longlong_t)BPE_GET_ETYPE(bp)); 693f63ab3d5SMatthew Ahrens } 694f63ab3d5SMatthew Ahrens } 695f63ab3d5SMatthew Ahrens 6966f793812SPavel Zakharov /* 6976f793812SPavel Zakharov * Do not verify individual DVAs if the config is not trusted. This 6986f793812SPavel Zakharov * will be done once the zio is executed in vdev_mirror_map_alloc. 6996f793812SPavel Zakharov */ 7006f793812SPavel Zakharov if (!spa->spa_trust_config) 7016f793812SPavel Zakharov return; 7026f793812SPavel Zakharov 703f63ab3d5SMatthew Ahrens /* 704f63ab3d5SMatthew Ahrens * Pool-specific checks. 705f63ab3d5SMatthew Ahrens * 706f63ab3d5SMatthew Ahrens * Note: it would be nice to verify that the blk_birth and 707f63ab3d5SMatthew Ahrens * BP_PHYSICAL_BIRTH() are not too large. However, spa_freeze() 708f63ab3d5SMatthew Ahrens * allows the birth time of log blocks (and dmu_sync()-ed blocks 709f63ab3d5SMatthew Ahrens * that are in the log) to be arbitrarily large. 710f63ab3d5SMatthew Ahrens */ 711f63ab3d5SMatthew Ahrens for (int i = 0; i < BP_GET_NDVAS(bp); i++) { 712f63ab3d5SMatthew Ahrens uint64_t vdevid = DVA_GET_VDEV(&bp->blk_dva[i]); 713f63ab3d5SMatthew Ahrens if (vdevid >= spa->spa_root_vdev->vdev_children) { 714f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p DVA %u has invalid " 715f63ab3d5SMatthew Ahrens "VDEV %llu", 716f63ab3d5SMatthew Ahrens bp, i, (longlong_t)vdevid); 7175897eb49SJustin Gibbs continue; 718f63ab3d5SMatthew Ahrens } 719f63ab3d5SMatthew Ahrens vdev_t *vd = spa->spa_root_vdev->vdev_child[vdevid]; 720f63ab3d5SMatthew Ahrens if (vd == NULL) { 721f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p DVA %u has invalid " 722f63ab3d5SMatthew Ahrens "VDEV %llu", 723f63ab3d5SMatthew Ahrens bp, i, (longlong_t)vdevid); 7245897eb49SJustin Gibbs continue; 725f63ab3d5SMatthew Ahrens } 726f63ab3d5SMatthew Ahrens if (vd->vdev_ops == &vdev_hole_ops) { 727f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p DVA %u has hole " 728f63ab3d5SMatthew Ahrens "VDEV %llu", 729f63ab3d5SMatthew Ahrens bp, i, (longlong_t)vdevid); 7305897eb49SJustin Gibbs continue; 731f63ab3d5SMatthew Ahrens } 732f63ab3d5SMatthew Ahrens if (vd->vdev_ops == &vdev_missing_ops) { 733f63ab3d5SMatthew Ahrens /* 734f63ab3d5SMatthew Ahrens * "missing" vdevs are valid during import, but we 735f63ab3d5SMatthew Ahrens * don't have their detailed info (e.g. asize), so 736f63ab3d5SMatthew Ahrens * we can't perform any more checks on them. 737f63ab3d5SMatthew Ahrens */ 738f63ab3d5SMatthew Ahrens continue; 739f63ab3d5SMatthew Ahrens } 740f63ab3d5SMatthew Ahrens uint64_t offset = DVA_GET_OFFSET(&bp->blk_dva[i]); 741f63ab3d5SMatthew Ahrens uint64_t asize = DVA_GET_ASIZE(&bp->blk_dva[i]); 742f63ab3d5SMatthew Ahrens if (BP_IS_GANG(bp)) 743f63ab3d5SMatthew Ahrens asize = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE); 744f63ab3d5SMatthew Ahrens if (offset + asize > vd->vdev_asize) { 745f63ab3d5SMatthew Ahrens zfs_panic_recover("blkptr at %p DVA %u has invalid " 746f63ab3d5SMatthew Ahrens "OFFSET %llu", 747f63ab3d5SMatthew Ahrens bp, i, (longlong_t)offset); 748f63ab3d5SMatthew Ahrens } 749f63ab3d5SMatthew Ahrens } 750f63ab3d5SMatthew Ahrens } 751f63ab3d5SMatthew Ahrens 7526f793812SPavel Zakharov boolean_t 7536f793812SPavel Zakharov zfs_dva_valid(spa_t *spa, const dva_t *dva, const blkptr_t *bp) 7546f793812SPavel Zakharov { 7556f793812SPavel Zakharov uint64_t vdevid = DVA_GET_VDEV(dva); 7566f793812SPavel Zakharov 7576f793812SPavel Zakharov if (vdevid >= spa->spa_root_vdev->vdev_children) 7586f793812SPavel Zakharov return (B_FALSE); 7596f793812SPavel Zakharov 7606f793812SPavel Zakharov vdev_t *vd = spa->spa_root_vdev->vdev_child[vdevid]; 7616f793812SPavel Zakharov if (vd == NULL) 7626f793812SPavel Zakharov return (B_FALSE); 7636f793812SPavel Zakharov 7646f793812SPavel Zakharov if (vd->vdev_ops == &vdev_hole_ops) 7656f793812SPavel Zakharov return (B_FALSE); 7666f793812SPavel Zakharov 7676f793812SPavel Zakharov if (vd->vdev_ops == &vdev_missing_ops) { 7686f793812SPavel Zakharov return (B_FALSE); 7696f793812SPavel Zakharov } 7706f793812SPavel Zakharov 7716f793812SPavel Zakharov uint64_t offset = DVA_GET_OFFSET(dva); 7726f793812SPavel Zakharov uint64_t asize = DVA_GET_ASIZE(dva); 7736f793812SPavel Zakharov 7746f793812SPavel Zakharov if (BP_IS_GANG(bp)) 7756f793812SPavel Zakharov asize = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE); 7766f793812SPavel Zakharov if (offset + asize > vd->vdev_asize) 7776f793812SPavel Zakharov return (B_FALSE); 7786f793812SPavel Zakharov 7796f793812SPavel Zakharov return (B_TRUE); 7806f793812SPavel Zakharov } 7816f793812SPavel Zakharov 782fa9e4066Sahrens zio_t * 783e14bb325SJeff Bonwick zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 784770499e1SDan Kimmel abd_t *data, uint64_t size, zio_done_func_t *done, void *private, 7857802d7bfSMatthew Ahrens zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb) 786fa9e4066Sahrens { 787fa9e4066Sahrens zio_t *zio; 788fa9e4066Sahrens 789f63ab3d5SMatthew Ahrens zfs_blkptr_verify(spa, bp); 790f63ab3d5SMatthew Ahrens 791b24ab676SJeff Bonwick zio = zio_create(pio, spa, BP_PHYSICAL_BIRTH(bp), bp, 7925602294fSDan Kimmel data, size, size, done, private, 793e14bb325SJeff Bonwick ZIO_TYPE_READ, priority, flags, NULL, 0, zb, 794b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 795b24ab676SJeff Bonwick ZIO_DDT_CHILD_READ_PIPELINE : ZIO_READ_PIPELINE); 796fa9e4066Sahrens 797fa9e4066Sahrens return (zio); 798fa9e4066Sahrens } 799fa9e4066Sahrens 800fa9e4066Sahrens zio_t * 801e14bb325SJeff Bonwick zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 802770499e1SDan Kimmel abd_t *data, uint64_t lsize, uint64_t psize, const zio_prop_t *zp, 8038df0bcf0SPaul Dagnelie zio_done_func_t *ready, zio_done_func_t *children_ready, 8048df0bcf0SPaul Dagnelie zio_done_func_t *physdone, zio_done_func_t *done, 8058df0bcf0SPaul Dagnelie void *private, zio_priority_t priority, enum zio_flag flags, 8068df0bcf0SPaul Dagnelie const zbookmark_phys_t *zb) 807fa9e4066Sahrens { 808fa9e4066Sahrens zio_t *zio; 809fa9e4066Sahrens 810e14bb325SJeff Bonwick ASSERT(zp->zp_checksum >= ZIO_CHECKSUM_OFF && 811e14bb325SJeff Bonwick zp->zp_checksum < ZIO_CHECKSUM_FUNCTIONS && 812e14bb325SJeff Bonwick zp->zp_compress >= ZIO_COMPRESS_OFF && 813e14bb325SJeff Bonwick zp->zp_compress < ZIO_COMPRESS_FUNCTIONS && 814ad135b5dSChristopher Siden DMU_OT_IS_VALID(zp->zp_type) && 815e14bb325SJeff Bonwick zp->zp_level < 32 && 816b24ab676SJeff Bonwick zp->zp_copies > 0 && 81780901aeaSGeorge Wilson zp->zp_copies <= spa_max_replication(spa)); 8180a4e9518Sgw 8195602294fSDan Kimmel zio = zio_create(pio, spa, txg, bp, data, lsize, psize, done, private, 820e14bb325SJeff Bonwick ZIO_TYPE_WRITE, priority, flags, NULL, 0, zb, 821b24ab676SJeff Bonwick ZIO_STAGE_OPEN, (flags & ZIO_FLAG_DDT_CHILD) ? 822b24ab676SJeff Bonwick ZIO_DDT_CHILD_WRITE_PIPELINE : ZIO_WRITE_PIPELINE); 823fa9e4066Sahrens 824c717a561Smaybee zio->io_ready = ready; 8258df0bcf0SPaul Dagnelie zio->io_children_ready = children_ready; 82669962b56SMatthew Ahrens zio->io_physdone = physdone; 827e14bb325SJeff Bonwick zio->io_prop = *zp; 828fa9e4066Sahrens 8295d7b4d43SMatthew Ahrens /* 8305d7b4d43SMatthew Ahrens * Data can be NULL if we are going to call zio_write_override() to 8315d7b4d43SMatthew Ahrens * provide the already-allocated BP. But we may need the data to 8325d7b4d43SMatthew Ahrens * verify a dedup hit (if requested). In this case, don't try to 8335d7b4d43SMatthew Ahrens * dedup (just take the already-allocated BP verbatim). 8345d7b4d43SMatthew Ahrens */ 8355d7b4d43SMatthew Ahrens if (data == NULL && zio->io_prop.zp_dedup_verify) { 8365d7b4d43SMatthew Ahrens zio->io_prop.zp_dedup = zio->io_prop.zp_dedup_verify = B_FALSE; 8375d7b4d43SMatthew Ahrens } 8385d7b4d43SMatthew Ahrens 839fa9e4066Sahrens return (zio); 840fa9e4066Sahrens } 841fa9e4066Sahrens 842fa9e4066Sahrens zio_t * 843770499e1SDan Kimmel zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, abd_t *data, 84469962b56SMatthew Ahrens uint64_t size, zio_done_func_t *done, void *private, 8457802d7bfSMatthew Ahrens zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb) 846fa9e4066Sahrens { 847fa9e4066Sahrens zio_t *zio; 848fa9e4066Sahrens 8495602294fSDan Kimmel zio = zio_create(pio, spa, txg, bp, data, size, size, done, private, 8500f7643c7SGeorge Wilson ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_IO_REWRITE, NULL, 0, zb, 851e14bb325SJeff Bonwick ZIO_STAGE_OPEN, ZIO_REWRITE_PIPELINE); 852fa9e4066Sahrens 853fa9e4066Sahrens return (zio); 854fa9e4066Sahrens } 855fa9e4066Sahrens 856b24ab676SJeff Bonwick void 85780901aeaSGeorge Wilson zio_write_override(zio_t *zio, blkptr_t *bp, int copies, boolean_t nopwrite) 858b24ab676SJeff Bonwick { 859b24ab676SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 860b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 861b24ab676SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_OPEN); 862b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(zio->io_spa)); 863b24ab676SJeff Bonwick 86480901aeaSGeorge Wilson /* 86580901aeaSGeorge Wilson * We must reset the io_prop to match the values that existed 86680901aeaSGeorge Wilson * when the bp was first written by dmu_sync() keeping in mind 86780901aeaSGeorge Wilson * that nopwrite and dedup are mutually exclusive. 86880901aeaSGeorge Wilson */ 86980901aeaSGeorge Wilson zio->io_prop.zp_dedup = nopwrite ? B_FALSE : zio->io_prop.zp_dedup; 87080901aeaSGeorge Wilson zio->io_prop.zp_nopwrite = nopwrite; 871b24ab676SJeff Bonwick zio->io_prop.zp_copies = copies; 872b24ab676SJeff Bonwick zio->io_bp_override = bp; 873b24ab676SJeff Bonwick } 874b24ab676SJeff Bonwick 875b24ab676SJeff Bonwick void 876b24ab676SJeff Bonwick zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp) 877b24ab676SJeff Bonwick { 8785d7b4d43SMatthew Ahrens 8795cabbc6bSPrashanth Sreenivasa zfs_blkptr_verify(spa, bp); 8805cabbc6bSPrashanth Sreenivasa 8815d7b4d43SMatthew Ahrens /* 8825d7b4d43SMatthew Ahrens * The check for EMBEDDED is a performance optimization. We 8835d7b4d43SMatthew Ahrens * process the free here (by ignoring it) rather than 8845d7b4d43SMatthew Ahrens * putting it on the list and then processing it in zio_free_sync(). 8855d7b4d43SMatthew Ahrens */ 8865d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 8875d7b4d43SMatthew Ahrens return; 8883b2aab18SMatthew Ahrens metaslab_check_free(spa, bp); 8899cb154a3SMatthew Ahrens 8909cb154a3SMatthew Ahrens /* 8919cb154a3SMatthew Ahrens * Frees that are for the currently-syncing txg, are not going to be 8929cb154a3SMatthew Ahrens * deferred, and which will not need to do a read (i.e. not GANG or 8939cb154a3SMatthew Ahrens * DEDUP), can be processed immediately. Otherwise, put them on the 8949cb154a3SMatthew Ahrens * in-memory list for later processing. 8959cb154a3SMatthew Ahrens */ 8969cb154a3SMatthew Ahrens if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp) || 8979cb154a3SMatthew Ahrens txg != spa->spa_syncing_txg || 8989cb154a3SMatthew Ahrens spa_sync_pass(spa) >= zfs_sync_pass_deferred_free) { 8999cb154a3SMatthew Ahrens bplist_append(&spa->spa_free_bplist[txg & TXG_MASK], bp); 9009cb154a3SMatthew Ahrens } else { 9019cb154a3SMatthew Ahrens VERIFY0(zio_wait(zio_free_sync(NULL, spa, txg, bp, 0))); 9029cb154a3SMatthew Ahrens } 903b24ab676SJeff Bonwick } 904b24ab676SJeff Bonwick 905fa9e4066Sahrens zio_t * 906b24ab676SJeff Bonwick zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 907b24ab676SJeff Bonwick enum zio_flag flags) 908fa9e4066Sahrens { 909fa9e4066Sahrens zio_t *zio; 9109cb154a3SMatthew Ahrens enum zio_stage stage = ZIO_FREE_PIPELINE; 911fa9e4066Sahrens 912fa9e4066Sahrens ASSERT(!BP_IS_HOLE(bp)); 913b24ab676SJeff Bonwick ASSERT(spa_syncing_txg(spa) == txg); 91401f55e48SGeorge Wilson ASSERT(spa_sync_pass(spa) < zfs_sync_pass_deferred_free); 915fa9e4066Sahrens 9165d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 9175d7b4d43SMatthew Ahrens return (zio_null(pio, spa, NULL, NULL, NULL, 0)); 9185d7b4d43SMatthew Ahrens 9193b2aab18SMatthew Ahrens metaslab_check_free(spa, bp); 9206e6d5868SMatthew Ahrens arc_freed(spa, bp); 9213b2aab18SMatthew Ahrens 9229cb154a3SMatthew Ahrens /* 9239cb154a3SMatthew Ahrens * GANG and DEDUP blocks can induce a read (for the gang block header, 9249cb154a3SMatthew Ahrens * or the DDT), so issue them asynchronously so that this thread is 9259cb154a3SMatthew Ahrens * not tied up. 9269cb154a3SMatthew Ahrens */ 9279cb154a3SMatthew Ahrens if (BP_IS_GANG(bp) || BP_GET_DEDUP(bp)) 9289cb154a3SMatthew Ahrens stage |= ZIO_STAGE_ISSUE_ASYNC; 9299cb154a3SMatthew Ahrens 930e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 9315602294fSDan Kimmel BP_GET_PSIZE(bp), NULL, NULL, ZIO_TYPE_FREE, ZIO_PRIORITY_NOW, 9325602294fSDan Kimmel flags, NULL, 0, NULL, ZIO_STAGE_OPEN, stage); 9339cb154a3SMatthew Ahrens 934fa9e4066Sahrens return (zio); 935fa9e4066Sahrens } 936fa9e4066Sahrens 937fa9e4066Sahrens zio_t * 938b24ab676SJeff Bonwick zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp, 939b24ab676SJeff Bonwick zio_done_func_t *done, void *private, enum zio_flag flags) 940fa9e4066Sahrens { 941fa9e4066Sahrens zio_t *zio; 942fa9e4066Sahrens 9435cabbc6bSPrashanth Sreenivasa zfs_blkptr_verify(spa, bp); 9445d7b4d43SMatthew Ahrens 9455d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 9465d7b4d43SMatthew Ahrens return (zio_null(pio, spa, NULL, NULL, NULL, 0)); 9475d7b4d43SMatthew Ahrens 948fa9e4066Sahrens /* 949fa9e4066Sahrens * A claim is an allocation of a specific block. Claims are needed 950fa9e4066Sahrens * to support immediate writes in the intent log. The issue is that 951fa9e4066Sahrens * immediate writes contain committed data, but in a txg that was 952fa9e4066Sahrens * *not* committed. Upon opening the pool after an unclean shutdown, 953fa9e4066Sahrens * the intent log claims all blocks that contain immediate write data 954fa9e4066Sahrens * so that the SPA knows they're in use. 955fa9e4066Sahrens * 956fa9e4066Sahrens * All claims *must* be resolved in the first txg -- before the SPA 957fa9e4066Sahrens * starts allocating blocks -- so that nothing is allocated twice. 958b24ab676SJeff Bonwick * If txg == 0 we just verify that the block is claimable. 959fa9e4066Sahrens */ 96086714001SSerapheim Dimitropoulos ASSERT3U(spa->spa_uberblock.ub_rootbp.blk_birth, <, 96186714001SSerapheim Dimitropoulos spa_min_claim_txg(spa)); 96286714001SSerapheim Dimitropoulos ASSERT(txg == spa_min_claim_txg(spa) || txg == 0); 963b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp) || !spa_writeable(spa)); /* zdb(1M) */ 964fa9e4066Sahrens 965e14bb325SJeff Bonwick zio = zio_create(pio, spa, txg, bp, NULL, BP_GET_PSIZE(bp), 9665602294fSDan Kimmel BP_GET_PSIZE(bp), done, private, ZIO_TYPE_CLAIM, ZIO_PRIORITY_NOW, 9675602294fSDan Kimmel flags, NULL, 0, NULL, ZIO_STAGE_OPEN, ZIO_CLAIM_PIPELINE); 9680f7643c7SGeorge Wilson ASSERT0(zio->io_queued_timestamp); 969fa9e4066Sahrens 970fa9e4066Sahrens return (zio); 971fa9e4066Sahrens } 972fa9e4066Sahrens 973fa9e4066Sahrens zio_t * 974fa9e4066Sahrens zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 97569962b56SMatthew Ahrens zio_done_func_t *done, void *private, enum zio_flag flags) 976fa9e4066Sahrens { 977fa9e4066Sahrens zio_t *zio; 978fa9e4066Sahrens int c; 979fa9e4066Sahrens 980fa9e4066Sahrens if (vd->vdev_children == 0) { 9815602294fSDan Kimmel zio = zio_create(pio, spa, 0, NULL, NULL, 0, 0, done, private, 98269962b56SMatthew Ahrens ZIO_TYPE_IOCTL, ZIO_PRIORITY_NOW, flags, vd, 0, NULL, 983fa9e4066Sahrens ZIO_STAGE_OPEN, ZIO_IOCTL_PIPELINE); 984fa9e4066Sahrens 985fa9e4066Sahrens zio->io_cmd = cmd; 986fa9e4066Sahrens } else { 987a3f829aeSBill Moore zio = zio_null(pio, spa, NULL, NULL, NULL, flags); 988fa9e4066Sahrens 989fa9e4066Sahrens for (c = 0; c < vd->vdev_children; c++) 990fa9e4066Sahrens zio_nowait(zio_ioctl(zio, spa, vd->vdev_child[c], cmd, 99169962b56SMatthew Ahrens done, private, flags)); 992fa9e4066Sahrens } 993fa9e4066Sahrens 994fa9e4066Sahrens return (zio); 995fa9e4066Sahrens } 996fa9e4066Sahrens 997fa9e4066Sahrens zio_t * 998fa9e4066Sahrens zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 999770499e1SDan Kimmel abd_t *data, int checksum, zio_done_func_t *done, void *private, 100069962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, boolean_t labels) 1001fa9e4066Sahrens { 1002fa9e4066Sahrens zio_t *zio; 10030a4e9518Sgw 1004e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 1005e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 1006e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 1007e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 1008fa9e4066Sahrens 10095602294fSDan Kimmel zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, size, done, 10105602294fSDan Kimmel private, ZIO_TYPE_READ, priority, flags | ZIO_FLAG_PHYSICAL, vd, 10115602294fSDan Kimmel offset, NULL, ZIO_STAGE_OPEN, ZIO_READ_PHYS_PIPELINE); 1012fa9e4066Sahrens 1013e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 1014fa9e4066Sahrens 1015fa9e4066Sahrens return (zio); 1016fa9e4066Sahrens } 1017fa9e4066Sahrens 1018fa9e4066Sahrens zio_t * 1019fa9e4066Sahrens zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size, 1020770499e1SDan Kimmel abd_t *data, int checksum, zio_done_func_t *done, void *private, 102169962b56SMatthew Ahrens zio_priority_t priority, enum zio_flag flags, boolean_t labels) 1022fa9e4066Sahrens { 1023fa9e4066Sahrens zio_t *zio; 10240a4e9518Sgw 1025e14bb325SJeff Bonwick ASSERT(vd->vdev_children == 0); 1026e14bb325SJeff Bonwick ASSERT(!labels || offset + size <= VDEV_LABEL_START_SIZE || 1027e14bb325SJeff Bonwick offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE); 1028e14bb325SJeff Bonwick ASSERT3U(offset + size, <=, vd->vdev_psize); 1029fa9e4066Sahrens 10305602294fSDan Kimmel zio = zio_create(pio, vd->vdev_spa, 0, NULL, data, size, size, done, 10315602294fSDan Kimmel private, ZIO_TYPE_WRITE, priority, flags | ZIO_FLAG_PHYSICAL, vd, 10325602294fSDan Kimmel offset, NULL, ZIO_STAGE_OPEN, ZIO_WRITE_PHYS_PIPELINE); 1033fa9e4066Sahrens 1034e14bb325SJeff Bonwick zio->io_prop.zp_checksum = checksum; 1035fa9e4066Sahrens 103645818ee1SMatthew Ahrens if (zio_checksum_table[checksum].ci_flags & ZCHECKSUM_FLAG_EMBEDDED) { 1037fa9e4066Sahrens /* 10386e1f5caaSNeil Perrin * zec checksums are necessarily destructive -- they modify 1039e14bb325SJeff Bonwick * the end of the write buffer to hold the verifier/checksum. 1040fa9e4066Sahrens * Therefore, we must make a local copy in case the data is 1041e14bb325SJeff Bonwick * being written to multiple places in parallel. 1042fa9e4066Sahrens */ 1043770499e1SDan Kimmel abd_t *wbuf = abd_alloc_sametype(data, size); 1044770499e1SDan Kimmel abd_copy(wbuf, data, size); 1045770499e1SDan Kimmel 1046e14bb325SJeff Bonwick zio_push_transform(zio, wbuf, size, size, NULL); 1047fa9e4066Sahrens } 1048fa9e4066Sahrens 1049fa9e4066Sahrens return (zio); 1050fa9e4066Sahrens } 1051fa9e4066Sahrens 1052fa9e4066Sahrens /* 1053e14bb325SJeff Bonwick * Create a child I/O to do some work for us. 1054fa9e4066Sahrens */ 1055fa9e4066Sahrens zio_t * 1056e14bb325SJeff Bonwick zio_vdev_child_io(zio_t *pio, blkptr_t *bp, vdev_t *vd, uint64_t offset, 1057770499e1SDan Kimmel abd_t *data, uint64_t size, int type, zio_priority_t priority, 1058dcbf3bd6SGeorge Wilson enum zio_flag flags, zio_done_func_t *done, void *private) 1059fa9e4066Sahrens { 1060b24ab676SJeff Bonwick enum zio_stage pipeline = ZIO_VDEV_CHILD_PIPELINE; 1061e14bb325SJeff Bonwick zio_t *zio; 1062e14bb325SJeff Bonwick 10635cabbc6bSPrashanth Sreenivasa /* 10645cabbc6bSPrashanth Sreenivasa * vdev child I/Os do not propagate their error to the parent. 10655cabbc6bSPrashanth Sreenivasa * Therefore, for correct operation the caller *must* check for 10665cabbc6bSPrashanth Sreenivasa * and handle the error in the child i/o's done callback. 10675cabbc6bSPrashanth Sreenivasa * The only exceptions are i/os that we don't care about 10685cabbc6bSPrashanth Sreenivasa * (OPTIONAL or REPAIR). 10695cabbc6bSPrashanth Sreenivasa */ 10705cabbc6bSPrashanth Sreenivasa ASSERT((flags & ZIO_FLAG_OPTIONAL) || (flags & ZIO_FLAG_IO_REPAIR) || 10715cabbc6bSPrashanth Sreenivasa done != NULL); 10725cabbc6bSPrashanth Sreenivasa 10735cabbc6bSPrashanth Sreenivasa /* 10745cabbc6bSPrashanth Sreenivasa * In the common case, where the parent zio was to a normal vdev, 10755cabbc6bSPrashanth Sreenivasa * the child zio must be to a child vdev of that vdev. Otherwise, 10765cabbc6bSPrashanth Sreenivasa * the child zio must be to a top-level vdev. 10775cabbc6bSPrashanth Sreenivasa */ 10785cabbc6bSPrashanth Sreenivasa if (pio->io_vd != NULL && pio->io_vd->vdev_ops != &vdev_indirect_ops) { 10795cabbc6bSPrashanth Sreenivasa ASSERT3P(vd->vdev_parent, ==, pio->io_vd); 10805cabbc6bSPrashanth Sreenivasa } else { 10815cabbc6bSPrashanth Sreenivasa ASSERT3P(vd, ==, vd->vdev_top); 10825cabbc6bSPrashanth Sreenivasa } 1083fa9e4066Sahrens 1084fa9e4066Sahrens if (type == ZIO_TYPE_READ && bp != NULL) { 1085fa9e4066Sahrens /* 1086fa9e4066Sahrens * If we have the bp, then the child should perform the 1087fa9e4066Sahrens * checksum and the parent need not. This pushes error 1088fa9e4066Sahrens * detection as close to the leaves as possible and 1089fa9e4066Sahrens * eliminates redundant checksums in the interior nodes. 1090fa9e4066Sahrens */ 1091b24ab676SJeff Bonwick pipeline |= ZIO_STAGE_CHECKSUM_VERIFY; 1092b24ab676SJeff Bonwick pio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 1093fa9e4066Sahrens } 1094fa9e4066Sahrens 10955cabbc6bSPrashanth Sreenivasa if (vd->vdev_ops->vdev_op_leaf) { 10965cabbc6bSPrashanth Sreenivasa ASSERT0(vd->vdev_children); 1097e14bb325SJeff Bonwick offset += VDEV_LABEL_START_SIZE; 10985cabbc6bSPrashanth Sreenivasa } 1099e14bb325SJeff Bonwick 11005cabbc6bSPrashanth Sreenivasa flags |= ZIO_VDEV_CHILD_FLAGS(pio); 1101b24ab676SJeff Bonwick 1102b24ab676SJeff Bonwick /* 1103b24ab676SJeff Bonwick * If we've decided to do a repair, the write is not speculative -- 1104b24ab676SJeff Bonwick * even if the original read was. 1105b24ab676SJeff Bonwick */ 1106b24ab676SJeff Bonwick if (flags & ZIO_FLAG_IO_REPAIR) 1107b24ab676SJeff Bonwick flags &= ~ZIO_FLAG_SPECULATIVE; 1108b24ab676SJeff Bonwick 11090f7643c7SGeorge Wilson /* 11100f7643c7SGeorge Wilson * If we're creating a child I/O that is not associated with a 11110f7643c7SGeorge Wilson * top-level vdev, then the child zio is not an allocating I/O. 11120f7643c7SGeorge Wilson * If this is a retried I/O then we ignore it since we will 11130f7643c7SGeorge Wilson * have already processed the original allocating I/O. 11140f7643c7SGeorge Wilson */ 11150f7643c7SGeorge Wilson if (flags & ZIO_FLAG_IO_ALLOCATING && 11160f7643c7SGeorge Wilson (vd != vd->vdev_top || (flags & ZIO_FLAG_IO_RETRY))) { 11170f7643c7SGeorge Wilson metaslab_class_t *mc = spa_normal_class(pio->io_spa); 11180f7643c7SGeorge Wilson 11190f7643c7SGeorge Wilson ASSERT(mc->mc_alloc_throttle_enabled); 11200f7643c7SGeorge Wilson ASSERT(type == ZIO_TYPE_WRITE); 11210f7643c7SGeorge Wilson ASSERT(priority == ZIO_PRIORITY_ASYNC_WRITE); 11220f7643c7SGeorge Wilson ASSERT(!(flags & ZIO_FLAG_IO_REPAIR)); 11230f7643c7SGeorge Wilson ASSERT(!(pio->io_flags & ZIO_FLAG_IO_REWRITE) || 11240f7643c7SGeorge Wilson pio->io_child_type == ZIO_CHILD_GANG); 11250f7643c7SGeorge Wilson 11260f7643c7SGeorge Wilson flags &= ~ZIO_FLAG_IO_ALLOCATING; 11270f7643c7SGeorge Wilson } 11280f7643c7SGeorge Wilson 11295602294fSDan Kimmel zio = zio_create(pio, pio->io_spa, pio->io_txg, bp, data, size, size, 1130b24ab676SJeff Bonwick done, private, type, priority, flags, vd, offset, &pio->io_bookmark, 1131b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, pipeline); 11320f7643c7SGeorge Wilson ASSERT3U(zio->io_child_type, ==, ZIO_CHILD_VDEV); 1133fa9e4066Sahrens 113469962b56SMatthew Ahrens zio->io_physdone = pio->io_physdone; 113569962b56SMatthew Ahrens if (vd->vdev_ops->vdev_op_leaf && zio->io_logical != NULL) 113669962b56SMatthew Ahrens zio->io_logical->io_phys_children++; 113769962b56SMatthew Ahrens 1138e14bb325SJeff Bonwick return (zio); 113932b87932Sek } 114032b87932Sek 1141e14bb325SJeff Bonwick zio_t * 1142770499e1SDan Kimmel zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, abd_t *data, uint64_t size, 11439a686fbcSPaul Dagnelie int type, zio_priority_t priority, enum zio_flag flags, 11449a686fbcSPaul Dagnelie zio_done_func_t *done, void *private) 1145fa9e4066Sahrens { 1146e14bb325SJeff Bonwick zio_t *zio; 1147fa9e4066Sahrens 1148e14bb325SJeff Bonwick ASSERT(vd->vdev_ops->vdev_op_leaf); 1149fa9e4066Sahrens 1150e14bb325SJeff Bonwick zio = zio_create(NULL, vd->vdev_spa, 0, NULL, 11515602294fSDan Kimmel data, size, size, done, private, type, priority, 115269962b56SMatthew Ahrens flags | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY | ZIO_FLAG_DELEGATED, 1153e14bb325SJeff Bonwick vd, offset, NULL, 1154b24ab676SJeff Bonwick ZIO_STAGE_VDEV_IO_START >> 1, ZIO_VDEV_CHILD_PIPELINE); 1155fa9e4066Sahrens 1156e14bb325SJeff Bonwick return (zio); 1157e05725b1Sbonwick } 1158e05725b1Sbonwick 1159e05725b1Sbonwick void 1160e14bb325SJeff Bonwick zio_flush(zio_t *zio, vdev_t *vd) 1161e05725b1Sbonwick { 1162e14bb325SJeff Bonwick zio_nowait(zio_ioctl(zio, zio->io_spa, vd, DKIOCFLUSHWRITECACHE, 116369962b56SMatthew Ahrens NULL, NULL, 1164e14bb325SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY)); 1165fa9e4066Sahrens } 1166fa9e4066Sahrens 11676e1f5caaSNeil Perrin void 11686e1f5caaSNeil Perrin zio_shrink(zio_t *zio, uint64_t size) 11696e1f5caaSNeil Perrin { 11701271e4b1SPrakash Surya ASSERT3P(zio->io_executor, ==, NULL); 11711271e4b1SPrakash Surya ASSERT3P(zio->io_orig_size, ==, zio->io_size); 11721271e4b1SPrakash Surya ASSERT3U(size, <=, zio->io_size); 11736e1f5caaSNeil Perrin 11746e1f5caaSNeil Perrin /* 11756e1f5caaSNeil Perrin * We don't shrink for raidz because of problems with the 11766e1f5caaSNeil Perrin * reconstruction when reading back less than the block size. 11776e1f5caaSNeil Perrin * Note, BP_IS_RAIDZ() assumes no compression. 11786e1f5caaSNeil Perrin */ 11796e1f5caaSNeil Perrin ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); 11805602294fSDan Kimmel if (!BP_IS_RAIDZ(zio->io_bp)) { 11815602294fSDan Kimmel /* we are not doing a raw write */ 11825602294fSDan Kimmel ASSERT3U(zio->io_size, ==, zio->io_lsize); 11835602294fSDan Kimmel zio->io_orig_size = zio->io_size = zio->io_lsize = size; 11845602294fSDan Kimmel } 11856e1f5caaSNeil Perrin } 11866e1f5caaSNeil Perrin 1187fa9e4066Sahrens /* 1188fa9e4066Sahrens * ========================================================================== 1189e14bb325SJeff Bonwick * Prepare to read and write logical blocks 1190fa9e4066Sahrens * ========================================================================== 1191fa9e4066Sahrens */ 1192e14bb325SJeff Bonwick 1193e05725b1Sbonwick static int 1194e14bb325SJeff Bonwick zio_read_bp_init(zio_t *zio) 1195fa9e4066Sahrens { 1196e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 1197e05725b1Sbonwick 11985cabbc6bSPrashanth Sreenivasa ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy); 11995cabbc6bSPrashanth Sreenivasa 120003361682SJeff Bonwick if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF && 1201f5383399SBill Moore zio->io_child_type == ZIO_CHILD_LOGICAL && 1202f5383399SBill Moore !(zio->io_flags & ZIO_FLAG_RAW)) { 12035d7b4d43SMatthew Ahrens uint64_t psize = 12045d7b4d43SMatthew Ahrens BP_IS_EMBEDDED(bp) ? BPE_GET_PSIZE(bp) : BP_GET_PSIZE(bp); 1205770499e1SDan Kimmel zio_push_transform(zio, abd_alloc_sametype(zio->io_abd, psize), 1206770499e1SDan Kimmel psize, psize, zio_decompress); 1207e14bb325SJeff Bonwick } 1208fa9e4066Sahrens 12095d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp) && BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA) { 12105d7b4d43SMatthew Ahrens zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1211770499e1SDan Kimmel 1212770499e1SDan Kimmel int psize = BPE_GET_PSIZE(bp); 1213770499e1SDan Kimmel void *data = abd_borrow_buf(zio->io_abd, psize); 1214770499e1SDan Kimmel decode_embedded_bp_compressed(bp, data); 1215770499e1SDan Kimmel abd_return_buf_copy(zio->io_abd, data, psize); 12165d7b4d43SMatthew Ahrens } else { 12175d7b4d43SMatthew Ahrens ASSERT(!BP_IS_EMBEDDED(bp)); 12185cabbc6bSPrashanth Sreenivasa ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy); 12195d7b4d43SMatthew Ahrens } 12205d7b4d43SMatthew Ahrens 1221ad135b5dSChristopher Siden if (!DMU_OT_IS_METADATA(BP_GET_TYPE(bp)) && BP_GET_LEVEL(bp) == 0) 1222e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 1223fa9e4066Sahrens 1224bbfd46c4SJeff Bonwick if (BP_GET_TYPE(bp) == DMU_OT_DDT_ZAP) 1225bbfd46c4SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_CACHE; 1226bbfd46c4SJeff Bonwick 1227b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp) && zio->io_child_type == ZIO_CHILD_LOGICAL) 1228b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_READ_PIPELINE; 1229b24ab676SJeff Bonwick 1230e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1231fa9e4066Sahrens } 1232fa9e4066Sahrens 1233e05725b1Sbonwick static int 1234e14bb325SJeff Bonwick zio_write_bp_init(zio_t *zio) 12350a4e9518Sgw { 1236e14bb325SJeff Bonwick if (!IO_IS_ALLOCATING(zio)) 1237e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 12380a4e9518Sgw 1239b24ab676SJeff Bonwick ASSERT(zio->io_child_type != ZIO_CHILD_DDT); 1240b24ab676SJeff Bonwick 1241b24ab676SJeff Bonwick if (zio->io_bp_override) { 12420f7643c7SGeorge Wilson blkptr_t *bp = zio->io_bp; 12430f7643c7SGeorge Wilson zio_prop_t *zp = &zio->io_prop; 12440f7643c7SGeorge Wilson 1245b24ab676SJeff Bonwick ASSERT(bp->blk_birth != zio->io_txg); 1246b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(zio->io_bp_override) == 0); 1247b24ab676SJeff Bonwick 1248b24ab676SJeff Bonwick *bp = *zio->io_bp_override; 1249b24ab676SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1250b24ab676SJeff Bonwick 12515d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 12525d7b4d43SMatthew Ahrens return (ZIO_PIPELINE_CONTINUE); 12535d7b4d43SMatthew Ahrens 125480901aeaSGeorge Wilson /* 125580901aeaSGeorge Wilson * If we've been overridden and nopwrite is set then 125680901aeaSGeorge Wilson * set the flag accordingly to indicate that a nopwrite 125780901aeaSGeorge Wilson * has already occurred. 125880901aeaSGeorge Wilson */ 125980901aeaSGeorge Wilson if (!BP_IS_HOLE(bp) && zp->zp_nopwrite) { 126080901aeaSGeorge Wilson ASSERT(!zp->zp_dedup); 12610f7643c7SGeorge Wilson ASSERT3U(BP_GET_CHECKSUM(bp), ==, zp->zp_checksum); 126280901aeaSGeorge Wilson zio->io_flags |= ZIO_FLAG_NOPWRITE; 126380901aeaSGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 126480901aeaSGeorge Wilson } 126580901aeaSGeorge Wilson 126680901aeaSGeorge Wilson ASSERT(!zp->zp_nopwrite); 126780901aeaSGeorge Wilson 1268b24ab676SJeff Bonwick if (BP_IS_HOLE(bp) || !zp->zp_dedup) 1269b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1270b24ab676SJeff Bonwick 127145818ee1SMatthew Ahrens ASSERT((zio_checksum_table[zp->zp_checksum].ci_flags & 127245818ee1SMatthew Ahrens ZCHECKSUM_FLAG_DEDUP) || zp->zp_dedup_verify); 1273b24ab676SJeff Bonwick 1274b24ab676SJeff Bonwick if (BP_GET_CHECKSUM(bp) == zp->zp_checksum) { 1275b24ab676SJeff Bonwick BP_SET_DEDUP(bp, 1); 1276b24ab676SJeff Bonwick zio->io_pipeline |= ZIO_STAGE_DDT_WRITE; 1277b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1278b24ab676SJeff Bonwick } 12790f7643c7SGeorge Wilson 12800f7643c7SGeorge Wilson /* 12810f7643c7SGeorge Wilson * We were unable to handle this as an override bp, treat 12820f7643c7SGeorge Wilson * it as a regular write I/O. 12830f7643c7SGeorge Wilson */ 1284b39b744bSMatthew Ahrens zio->io_bp_override = NULL; 12850f7643c7SGeorge Wilson *bp = zio->io_bp_orig; 12860f7643c7SGeorge Wilson zio->io_pipeline = zio->io_orig_pipeline; 1287b24ab676SJeff Bonwick } 12880a4e9518Sgw 12890f7643c7SGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 12900f7643c7SGeorge Wilson } 12910f7643c7SGeorge Wilson 12920f7643c7SGeorge Wilson static int 12930f7643c7SGeorge Wilson zio_write_compress(zio_t *zio) 12940f7643c7SGeorge Wilson { 12950f7643c7SGeorge Wilson spa_t *spa = zio->io_spa; 12960f7643c7SGeorge Wilson zio_prop_t *zp = &zio->io_prop; 12970f7643c7SGeorge Wilson enum zio_compress compress = zp->zp_compress; 12980f7643c7SGeorge Wilson blkptr_t *bp = zio->io_bp; 12995602294fSDan Kimmel uint64_t lsize = zio->io_lsize; 13005602294fSDan Kimmel uint64_t psize = zio->io_size; 13010f7643c7SGeorge Wilson int pass = 1; 13020f7643c7SGeorge Wilson 13035602294fSDan Kimmel EQUIV(lsize != psize, (zio->io_flags & ZIO_FLAG_RAW) != 0); 13045602294fSDan Kimmel 13050f7643c7SGeorge Wilson /* 13060f7643c7SGeorge Wilson * If our children haven't all reached the ready stage, 13070f7643c7SGeorge Wilson * wait for them and then repeat this pipeline stage. 13080f7643c7SGeorge Wilson */ 1309d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_LOGICAL_BIT | 1310d6e1c446SGeorge Wilson ZIO_CHILD_GANG_BIT, ZIO_WAIT_READY)) { 13110f7643c7SGeorge Wilson return (ZIO_PIPELINE_STOP); 1312d6e1c446SGeorge Wilson } 13130f7643c7SGeorge Wilson 13140f7643c7SGeorge Wilson if (!IO_IS_ALLOCATING(zio)) 13150f7643c7SGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 13160f7643c7SGeorge Wilson 13170f7643c7SGeorge Wilson if (zio->io_children_ready != NULL) { 13180f7643c7SGeorge Wilson /* 13190f7643c7SGeorge Wilson * Now that all our children are ready, run the callback 13200f7643c7SGeorge Wilson * associated with this zio in case it wants to modify the 13210f7643c7SGeorge Wilson * data to be written. 13220f7643c7SGeorge Wilson */ 13230f7643c7SGeorge Wilson ASSERT3U(zp->zp_level, >, 0); 13240f7643c7SGeorge Wilson zio->io_children_ready(zio); 13250f7643c7SGeorge Wilson } 13260f7643c7SGeorge Wilson 13270f7643c7SGeorge Wilson ASSERT(zio->io_child_type != ZIO_CHILD_DDT); 13280f7643c7SGeorge Wilson ASSERT(zio->io_bp_override == NULL); 13290f7643c7SGeorge Wilson 133043466aaeSMax Grossman if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg) { 1331e14bb325SJeff Bonwick /* 1332e14bb325SJeff Bonwick * We're rewriting an existing block, which means we're 1333e14bb325SJeff Bonwick * working on behalf of spa_sync(). For spa_sync() to 1334e14bb325SJeff Bonwick * converge, it must eventually be the case that we don't 1335e14bb325SJeff Bonwick * have to allocate new blocks. But compression changes 1336e14bb325SJeff Bonwick * the blocksize, which forces a reallocate, and makes 1337e14bb325SJeff Bonwick * convergence take longer. Therefore, after the first 1338e14bb325SJeff Bonwick * few passes, stop compressing to ensure convergence. 1339e14bb325SJeff Bonwick */ 1340b24ab676SJeff Bonwick pass = spa_sync_pass(spa); 1341b24ab676SJeff Bonwick 1342b24ab676SJeff Bonwick ASSERT(zio->io_txg == spa_syncing_txg(spa)); 1343b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1344b24ab676SJeff Bonwick ASSERT(!BP_GET_DEDUP(bp)); 1345e05725b1Sbonwick 134601f55e48SGeorge Wilson if (pass >= zfs_sync_pass_dont_compress) 1347e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 1348e05725b1Sbonwick 1349e14bb325SJeff Bonwick /* Make sure someone doesn't change their mind on overwrites */ 13505d7b4d43SMatthew Ahrens ASSERT(BP_IS_EMBEDDED(bp) || MIN(zp->zp_copies + BP_IS_GANG(bp), 1351b24ab676SJeff Bonwick spa_max_replication(spa)) == BP_GET_NDVAS(bp)); 1352e14bb325SJeff Bonwick } 1353fa9e4066Sahrens 13545602294fSDan Kimmel /* If it's a compressed write that is not raw, compress the buffer. */ 13555602294fSDan Kimmel if (compress != ZIO_COMPRESS_OFF && psize == lsize) { 1356b24ab676SJeff Bonwick void *cbuf = zio_buf_alloc(lsize); 1357770499e1SDan Kimmel psize = zio_compress_data(compress, zio->io_abd, cbuf, lsize); 1358b24ab676SJeff Bonwick if (psize == 0 || psize == lsize) { 1359e14bb325SJeff Bonwick compress = ZIO_COMPRESS_OFF; 1360b24ab676SJeff Bonwick zio_buf_free(cbuf, lsize); 13615d7b4d43SMatthew Ahrens } else if (!zp->zp_dedup && psize <= BPE_PAYLOAD_SIZE && 13625d7b4d43SMatthew Ahrens zp->zp_level == 0 && !DMU_OT_HAS_FILL(zp->zp_type) && 13635d7b4d43SMatthew Ahrens spa_feature_is_enabled(spa, SPA_FEATURE_EMBEDDED_DATA)) { 13645d7b4d43SMatthew Ahrens encode_embedded_bp_compressed(bp, 13655d7b4d43SMatthew Ahrens cbuf, compress, lsize, psize); 13665d7b4d43SMatthew Ahrens BPE_SET_ETYPE(bp, BP_EMBEDDED_TYPE_DATA); 13675d7b4d43SMatthew Ahrens BP_SET_TYPE(bp, zio->io_prop.zp_type); 13685d7b4d43SMatthew Ahrens BP_SET_LEVEL(bp, zio->io_prop.zp_level); 13695d7b4d43SMatthew Ahrens zio_buf_free(cbuf, lsize); 13705d7b4d43SMatthew Ahrens bp->blk_birth = zio->io_txg; 13715d7b4d43SMatthew Ahrens zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 13725d7b4d43SMatthew Ahrens ASSERT(spa_feature_is_active(spa, 13735d7b4d43SMatthew Ahrens SPA_FEATURE_EMBEDDED_DATA)); 13745d7b4d43SMatthew Ahrens return (ZIO_PIPELINE_CONTINUE); 1375b24ab676SJeff Bonwick } else { 13765d7b4d43SMatthew Ahrens /* 137781cd5c55SMatthew Ahrens * Round up compressed size up to the ashift 137881cd5c55SMatthew Ahrens * of the smallest-ashift device, and zero the tail. 137981cd5c55SMatthew Ahrens * This ensures that the compressed size of the BP 138081cd5c55SMatthew Ahrens * (and thus compressratio property) are correct, 138181cd5c55SMatthew Ahrens * in that we charge for the padding used to fill out 138281cd5c55SMatthew Ahrens * the last sector. 13835d7b4d43SMatthew Ahrens */ 138481cd5c55SMatthew Ahrens ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT); 138581cd5c55SMatthew Ahrens size_t rounded = (size_t)P2ROUNDUP(psize, 138681cd5c55SMatthew Ahrens 1ULL << spa->spa_min_ashift); 138781cd5c55SMatthew Ahrens if (rounded >= lsize) { 13885d7b4d43SMatthew Ahrens compress = ZIO_COMPRESS_OFF; 13895d7b4d43SMatthew Ahrens zio_buf_free(cbuf, lsize); 139081cd5c55SMatthew Ahrens psize = lsize; 13915d7b4d43SMatthew Ahrens } else { 1392770499e1SDan Kimmel abd_t *cdata = abd_get_from_buf(cbuf, lsize); 1393770499e1SDan Kimmel abd_take_ownership_of_buf(cdata, B_TRUE); 1394770499e1SDan Kimmel abd_zero_off(cdata, psize, rounded - psize); 139581cd5c55SMatthew Ahrens psize = rounded; 1396770499e1SDan Kimmel zio_push_transform(zio, cdata, 13975d7b4d43SMatthew Ahrens psize, lsize, NULL); 13985d7b4d43SMatthew Ahrens } 1399e14bb325SJeff Bonwick } 14000f7643c7SGeorge Wilson 14010f7643c7SGeorge Wilson /* 14020f7643c7SGeorge Wilson * We were unable to handle this as an override bp, treat 14030f7643c7SGeorge Wilson * it as a regular write I/O. 14040f7643c7SGeorge Wilson */ 14050f7643c7SGeorge Wilson zio->io_bp_override = NULL; 14060f7643c7SGeorge Wilson *bp = zio->io_bp_orig; 14070f7643c7SGeorge Wilson zio->io_pipeline = zio->io_orig_pipeline; 14085602294fSDan Kimmel } else { 14095602294fSDan Kimmel ASSERT3U(psize, !=, 0); 1410e14bb325SJeff Bonwick } 1411c717a561Smaybee 1412e14bb325SJeff Bonwick /* 1413e14bb325SJeff Bonwick * The final pass of spa_sync() must be all rewrites, but the first 1414e14bb325SJeff Bonwick * few passes offer a trade-off: allocating blocks defers convergence, 1415e14bb325SJeff Bonwick * but newly allocated blocks are sequential, so they can be written 1416e14bb325SJeff Bonwick * to disk faster. Therefore, we allow the first few passes of 1417e14bb325SJeff Bonwick * spa_sync() to allocate new blocks, but force rewrites after that. 1418e14bb325SJeff Bonwick * There should only be a handful of blocks after pass 1 in any case. 1419e14bb325SJeff Bonwick */ 142043466aaeSMax Grossman if (!BP_IS_HOLE(bp) && bp->blk_birth == zio->io_txg && 142143466aaeSMax Grossman BP_GET_PSIZE(bp) == psize && 142201f55e48SGeorge Wilson pass >= zfs_sync_pass_rewrite) { 1423b24ab676SJeff Bonwick ASSERT(psize != 0); 1424b24ab676SJeff Bonwick enum zio_stage gang_stages = zio->io_pipeline & ZIO_GANG_STAGES; 1425e14bb325SJeff Bonwick zio->io_pipeline = ZIO_REWRITE_PIPELINE | gang_stages; 1426e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_REWRITE; 1427e14bb325SJeff Bonwick } else { 1428e14bb325SJeff Bonwick BP_ZERO(bp); 1429e14bb325SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 1430e14bb325SJeff Bonwick } 1431fa9e4066Sahrens 1432b24ab676SJeff Bonwick if (psize == 0) { 143343466aaeSMax Grossman if (zio->io_bp_orig.blk_birth != 0 && 143443466aaeSMax Grossman spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { 143543466aaeSMax Grossman BP_SET_LSIZE(bp, lsize); 143643466aaeSMax Grossman BP_SET_TYPE(bp, zp->zp_type); 143743466aaeSMax Grossman BP_SET_LEVEL(bp, zp->zp_level); 143843466aaeSMax Grossman BP_SET_BIRTH(bp, zio->io_txg, 0); 143943466aaeSMax Grossman } 1440e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 1441e14bb325SJeff Bonwick } else { 1442e14bb325SJeff Bonwick ASSERT(zp->zp_checksum != ZIO_CHECKSUM_GANG_HEADER); 1443e14bb325SJeff Bonwick BP_SET_LSIZE(bp, lsize); 144443466aaeSMax Grossman BP_SET_TYPE(bp, zp->zp_type); 144543466aaeSMax Grossman BP_SET_LEVEL(bp, zp->zp_level); 1446b24ab676SJeff Bonwick BP_SET_PSIZE(bp, psize); 1447e14bb325SJeff Bonwick BP_SET_COMPRESS(bp, compress); 1448e14bb325SJeff Bonwick BP_SET_CHECKSUM(bp, zp->zp_checksum); 1449b24ab676SJeff Bonwick BP_SET_DEDUP(bp, zp->zp_dedup); 1450e14bb325SJeff Bonwick BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER); 1451b24ab676SJeff Bonwick if (zp->zp_dedup) { 1452b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1453b24ab676SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 1454b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_WRITE_PIPELINE; 1455b24ab676SJeff Bonwick } 145680901aeaSGeorge Wilson if (zp->zp_nopwrite) { 145780901aeaSGeorge Wilson ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 145880901aeaSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 145980901aeaSGeorge Wilson zio->io_pipeline |= ZIO_STAGE_NOP_WRITE; 146080901aeaSGeorge Wilson } 1461b24ab676SJeff Bonwick } 1462b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 1463b24ab676SJeff Bonwick } 1464b24ab676SJeff Bonwick 1465b24ab676SJeff Bonwick static int 1466b24ab676SJeff Bonwick zio_free_bp_init(zio_t *zio) 1467b24ab676SJeff Bonwick { 1468b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 1469b24ab676SJeff Bonwick 1470b24ab676SJeff Bonwick if (zio->io_child_type == ZIO_CHILD_LOGICAL) { 1471b24ab676SJeff Bonwick if (BP_GET_DEDUP(bp)) 1472b24ab676SJeff Bonwick zio->io_pipeline = ZIO_DDT_FREE_PIPELINE; 1473e14bb325SJeff Bonwick } 1474fa9e4066Sahrens 14755cabbc6bSPrashanth Sreenivasa ASSERT3P(zio->io_bp, ==, &zio->io_bp_copy); 14765cabbc6bSPrashanth Sreenivasa 1477e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 1478fa9e4066Sahrens } 1479fa9e4066Sahrens 1480e14bb325SJeff Bonwick /* 1481e14bb325SJeff Bonwick * ========================================================================== 1482e14bb325SJeff Bonwick * Execute the I/O pipeline 1483e14bb325SJeff Bonwick * ========================================================================== 1484e14bb325SJeff Bonwick */ 1485e14bb325SJeff Bonwick 1486e14bb325SJeff Bonwick static void 1487ec94d322SAdam Leventhal zio_taskq_dispatch(zio_t *zio, zio_taskq_type_t q, boolean_t cutinline) 1488fa9e4066Sahrens { 148980eb36f2SGeorge Wilson spa_t *spa = zio->io_spa; 1490e14bb325SJeff Bonwick zio_type_t t = zio->io_type; 14915aeb9474SGarrett D'Amore int flags = (cutinline ? TQ_FRONT : 0); 14920a4e9518Sgw 14930a4e9518Sgw /* 1494bbe36defSGeorge Wilson * If we're a config writer or a probe, the normal issue and 1495bbe36defSGeorge Wilson * interrupt threads may all be blocked waiting for the config lock. 1496bbe36defSGeorge Wilson * In this case, select the otherwise-unused taskq for ZIO_TYPE_NULL. 14970a4e9518Sgw */ 1498bbe36defSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_PROBE)) 1499e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 15000a4e9518Sgw 15010a4e9518Sgw /* 1502e14bb325SJeff Bonwick * A similar issue exists for the L2ARC write thread until L2ARC 2.0. 15030a4e9518Sgw */ 1504e14bb325SJeff Bonwick if (t == ZIO_TYPE_WRITE && zio->io_vd && zio->io_vd->vdev_aux) 1505e14bb325SJeff Bonwick t = ZIO_TYPE_NULL; 15060a4e9518Sgw 150780eb36f2SGeorge Wilson /* 1508ec94d322SAdam Leventhal * If this is a high priority I/O, then use the high priority taskq if 1509ec94d322SAdam Leventhal * available. 151080eb36f2SGeorge Wilson */ 151180eb36f2SGeorge Wilson if (zio->io_priority == ZIO_PRIORITY_NOW && 1512ec94d322SAdam Leventhal spa->spa_zio_taskq[t][q + 1].stqs_count != 0) 151380eb36f2SGeorge Wilson q++; 151480eb36f2SGeorge Wilson 151580eb36f2SGeorge Wilson ASSERT3U(q, <, ZIO_TASKQ_TYPES); 15165aeb9474SGarrett D'Amore 15175aeb9474SGarrett D'Amore /* 15185aeb9474SGarrett D'Amore * NB: We are assuming that the zio can only be dispatched 15195aeb9474SGarrett D'Amore * to a single taskq at a time. It would be a grievous error 15205aeb9474SGarrett D'Amore * to dispatch the zio to another taskq at the same time. 15215aeb9474SGarrett D'Amore */ 15225aeb9474SGarrett D'Amore ASSERT(zio->io_tqent.tqent_next == NULL); 1523ec94d322SAdam Leventhal spa_taskq_dispatch_ent(spa, t, q, (task_func_t *)zio_execute, zio, 1524ec94d322SAdam Leventhal flags, &zio->io_tqent); 1525e14bb325SJeff Bonwick } 15260a4e9518Sgw 1527e14bb325SJeff Bonwick static boolean_t 1528ec94d322SAdam Leventhal zio_taskq_member(zio_t *zio, zio_taskq_type_t q) 1529e14bb325SJeff Bonwick { 1530e14bb325SJeff Bonwick kthread_t *executor = zio->io_executor; 1531e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 15320a4e9518Sgw 1533ec94d322SAdam Leventhal for (zio_type_t t = 0; t < ZIO_TYPES; t++) { 1534ec94d322SAdam Leventhal spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 1535ec94d322SAdam Leventhal uint_t i; 1536ec94d322SAdam Leventhal for (i = 0; i < tqs->stqs_count; i++) { 1537ec94d322SAdam Leventhal if (taskq_member(tqs->stqs_taskq[i], executor)) 1538ec94d322SAdam Leventhal return (B_TRUE); 1539ec94d322SAdam Leventhal } 1540ec94d322SAdam Leventhal } 15410a4e9518Sgw 1542e14bb325SJeff Bonwick return (B_FALSE); 1543e14bb325SJeff Bonwick } 1544e05725b1Sbonwick 1545e14bb325SJeff Bonwick static int 1546e14bb325SJeff Bonwick zio_issue_async(zio_t *zio) 1547e14bb325SJeff Bonwick { 154835a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 1549e14bb325SJeff Bonwick 1550e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 15510a4e9518Sgw } 15520a4e9518Sgw 1553e14bb325SJeff Bonwick void 1554e14bb325SJeff Bonwick zio_interrupt(zio_t *zio) 15550a4e9518Sgw { 155635a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_INTERRUPT, B_FALSE); 1557e14bb325SJeff Bonwick } 15580a4e9518Sgw 155997e81309SPrakash Surya void 156097e81309SPrakash Surya zio_delay_interrupt(zio_t *zio) 156197e81309SPrakash Surya { 156297e81309SPrakash Surya /* 156397e81309SPrakash Surya * The timeout_generic() function isn't defined in userspace, so 156497e81309SPrakash Surya * rather than trying to implement the function, the zio delay 156597e81309SPrakash Surya * functionality has been disabled for userspace builds. 156697e81309SPrakash Surya */ 156797e81309SPrakash Surya 156897e81309SPrakash Surya #ifdef _KERNEL 156997e81309SPrakash Surya /* 157097e81309SPrakash Surya * If io_target_timestamp is zero, then no delay has been registered 157197e81309SPrakash Surya * for this IO, thus jump to the end of this function and "skip" the 157297e81309SPrakash Surya * delay; issuing it directly to the zio layer. 157397e81309SPrakash Surya */ 157497e81309SPrakash Surya if (zio->io_target_timestamp != 0) { 157597e81309SPrakash Surya hrtime_t now = gethrtime(); 157697e81309SPrakash Surya 157797e81309SPrakash Surya if (now >= zio->io_target_timestamp) { 157897e81309SPrakash Surya /* 157997e81309SPrakash Surya * This IO has already taken longer than the target 158097e81309SPrakash Surya * delay to complete, so we don't want to delay it 158197e81309SPrakash Surya * any longer; we "miss" the delay and issue it 158297e81309SPrakash Surya * directly to the zio layer. This is likely due to 158397e81309SPrakash Surya * the target latency being set to a value less than 158497e81309SPrakash Surya * the underlying hardware can satisfy (e.g. delay 158597e81309SPrakash Surya * set to 1ms, but the disks take 10ms to complete an 158697e81309SPrakash Surya * IO request). 158797e81309SPrakash Surya */ 158897e81309SPrakash Surya 158997e81309SPrakash Surya DTRACE_PROBE2(zio__delay__miss, zio_t *, zio, 159097e81309SPrakash Surya hrtime_t, now); 159197e81309SPrakash Surya 159297e81309SPrakash Surya zio_interrupt(zio); 159397e81309SPrakash Surya } else { 159497e81309SPrakash Surya hrtime_t diff = zio->io_target_timestamp - now; 159597e81309SPrakash Surya 159697e81309SPrakash Surya DTRACE_PROBE3(zio__delay__hit, zio_t *, zio, 159797e81309SPrakash Surya hrtime_t, now, hrtime_t, diff); 159897e81309SPrakash Surya 159997e81309SPrakash Surya (void) timeout_generic(CALLOUT_NORMAL, 160097e81309SPrakash Surya (void (*)(void *))zio_interrupt, zio, diff, 1, 0); 160197e81309SPrakash Surya } 160297e81309SPrakash Surya 160397e81309SPrakash Surya return; 160497e81309SPrakash Surya } 160597e81309SPrakash Surya #endif 160697e81309SPrakash Surya 160797e81309SPrakash Surya DTRACE_PROBE1(zio__delay__skip, zio_t *, zio); 160897e81309SPrakash Surya zio_interrupt(zio); 160997e81309SPrakash Surya } 161097e81309SPrakash Surya 1611e14bb325SJeff Bonwick /* 1612e14bb325SJeff Bonwick * Execute the I/O pipeline until one of the following occurs: 1613f7170741SWill Andrews * 1614f7170741SWill Andrews * (1) the I/O completes 1615f7170741SWill Andrews * (2) the pipeline stalls waiting for dependent child I/Os 1616f7170741SWill Andrews * (3) the I/O issues, so we're waiting for an I/O completion interrupt 1617f7170741SWill Andrews * (4) the I/O is delegated by vdev-level caching or aggregation 1618f7170741SWill Andrews * (5) the I/O is deferred due to vdev-level queueing 1619f7170741SWill Andrews * (6) the I/O is handed off to another thread. 1620f7170741SWill Andrews * 1621f7170741SWill Andrews * In all cases, the pipeline stops whenever there's no CPU work; it never 1622f7170741SWill Andrews * burns a thread in cv_wait(). 1623e14bb325SJeff Bonwick * 1624e14bb325SJeff Bonwick * There's no locking on io_stage because there's no legitimate way 1625e14bb325SJeff Bonwick * for multiple threads to be attempting to process the same I/O. 1626e14bb325SJeff Bonwick */ 1627b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[]; 16280a4e9518Sgw 1629e14bb325SJeff Bonwick void 1630e14bb325SJeff Bonwick zio_execute(zio_t *zio) 1631e14bb325SJeff Bonwick { 1632e14bb325SJeff Bonwick zio->io_executor = curthread; 16330a4e9518Sgw 16340f7643c7SGeorge Wilson ASSERT3U(zio->io_queued_timestamp, >, 0); 16350f7643c7SGeorge Wilson 1636e14bb325SJeff Bonwick while (zio->io_stage < ZIO_STAGE_DONE) { 1637b24ab676SJeff Bonwick enum zio_stage pipeline = zio->io_pipeline; 1638b24ab676SJeff Bonwick enum zio_stage stage = zio->io_stage; 1639e14bb325SJeff Bonwick int rv; 16400a4e9518Sgw 1641e14bb325SJeff Bonwick ASSERT(!MUTEX_HELD(&zio->io_lock)); 1642b24ab676SJeff Bonwick ASSERT(ISP2(stage)); 1643b24ab676SJeff Bonwick ASSERT(zio->io_stall == NULL); 16440a4e9518Sgw 1645b24ab676SJeff Bonwick do { 1646b24ab676SJeff Bonwick stage <<= 1; 1647b24ab676SJeff Bonwick } while ((stage & pipeline) == 0); 1648e14bb325SJeff Bonwick 1649e14bb325SJeff Bonwick ASSERT(stage <= ZIO_STAGE_DONE); 16500a4e9518Sgw 16510a4e9518Sgw /* 1652e14bb325SJeff Bonwick * If we are in interrupt context and this pipeline stage 1653e14bb325SJeff Bonwick * will grab a config lock that is held across I/O, 1654b24ab676SJeff Bonwick * or may wait for an I/O that needs an interrupt thread 1655b24ab676SJeff Bonwick * to complete, issue async to avoid deadlock. 165635a5a358SJonathan Adams * 165735a5a358SJonathan Adams * For VDEV_IO_START, we cut in line so that the io will 165835a5a358SJonathan Adams * be sent to disk promptly. 16590a4e9518Sgw */ 1660b24ab676SJeff Bonwick if ((stage & ZIO_BLOCKING_STAGES) && zio->io_vd == NULL && 1661e14bb325SJeff Bonwick zio_taskq_member(zio, ZIO_TASKQ_INTERRUPT)) { 166235a5a358SJonathan Adams boolean_t cut = (stage == ZIO_STAGE_VDEV_IO_START) ? 166335a5a358SJonathan Adams zio_requeue_io_start_cut_in_line : B_FALSE; 166435a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, cut); 1665e14bb325SJeff Bonwick return; 16660a4e9518Sgw } 16670a4e9518Sgw 1668e14bb325SJeff Bonwick zio->io_stage = stage; 16690f7643c7SGeorge Wilson zio->io_pipeline_trace |= zio->io_stage; 1670bf16b11eSMatthew Ahrens rv = zio_pipeline[highbit64(stage) - 1](zio); 16710a4e9518Sgw 1672e14bb325SJeff Bonwick if (rv == ZIO_PIPELINE_STOP) 1673e14bb325SJeff Bonwick return; 16740a4e9518Sgw 1675e14bb325SJeff Bonwick ASSERT(rv == ZIO_PIPELINE_CONTINUE); 1676e14bb325SJeff Bonwick } 16770a4e9518Sgw } 16780a4e9518Sgw 1679e14bb325SJeff Bonwick /* 1680e14bb325SJeff Bonwick * ========================================================================== 1681e14bb325SJeff Bonwick * Initiate I/O, either sync or async 1682e14bb325SJeff Bonwick * ========================================================================== 1683e14bb325SJeff Bonwick */ 1684e14bb325SJeff Bonwick int 1685e14bb325SJeff Bonwick zio_wait(zio_t *zio) 16860a4e9518Sgw { 1687e14bb325SJeff Bonwick int error; 16880a4e9518Sgw 16891271e4b1SPrakash Surya ASSERT3P(zio->io_stage, ==, ZIO_STAGE_OPEN); 16901271e4b1SPrakash Surya ASSERT3P(zio->io_executor, ==, NULL); 16910a4e9518Sgw 1692e14bb325SJeff Bonwick zio->io_waiter = curthread; 16930f7643c7SGeorge Wilson ASSERT0(zio->io_queued_timestamp); 16940f7643c7SGeorge Wilson zio->io_queued_timestamp = gethrtime(); 1695e05725b1Sbonwick 1696e14bb325SJeff Bonwick zio_execute(zio); 16970a4e9518Sgw 1698e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 1699e14bb325SJeff Bonwick while (zio->io_executor != NULL) 1700e14bb325SJeff Bonwick cv_wait(&zio->io_cv, &zio->io_lock); 1701e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 170232b87932Sek 1703e14bb325SJeff Bonwick error = zio->io_error; 1704e14bb325SJeff Bonwick zio_destroy(zio); 170532b87932Sek 1706e14bb325SJeff Bonwick return (error); 170732b87932Sek } 170832b87932Sek 1709e14bb325SJeff Bonwick void 1710e14bb325SJeff Bonwick zio_nowait(zio_t *zio) 17110a4e9518Sgw { 17121271e4b1SPrakash Surya ASSERT3P(zio->io_executor, ==, NULL); 1713fa9e4066Sahrens 1714a3f829aeSBill Moore if (zio->io_child_type == ZIO_CHILD_LOGICAL && 1715a3f829aeSBill Moore zio_unique_parent(zio) == NULL) { 1716ea8dc4b6Seschrock /* 1717e14bb325SJeff Bonwick * This is a logical async I/O with no parent to wait for it. 171854d692b7SGeorge Wilson * We add it to the spa_async_root_zio "Godfather" I/O which 171954d692b7SGeorge Wilson * will ensure they complete prior to unloading the pool. 1720ea8dc4b6Seschrock */ 1721e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 172254d692b7SGeorge Wilson 17236f834bc1SMatthew Ahrens zio_add_child(spa->spa_async_zio_root[CPU_SEQID], zio); 1724e14bb325SJeff Bonwick } 1725ea8dc4b6Seschrock 17260f7643c7SGeorge Wilson ASSERT0(zio->io_queued_timestamp); 17270f7643c7SGeorge Wilson zio->io_queued_timestamp = gethrtime(); 1728e14bb325SJeff Bonwick zio_execute(zio); 1729e14bb325SJeff Bonwick } 1730ea8dc4b6Seschrock 1731e14bb325SJeff Bonwick /* 1732e14bb325SJeff Bonwick * ========================================================================== 17331271e4b1SPrakash Surya * Reexecute, cancel, or suspend/resume failed I/O 1734e14bb325SJeff Bonwick * ========================================================================== 1735e14bb325SJeff Bonwick */ 1736fa9e4066Sahrens 1737e14bb325SJeff Bonwick static void 1738e14bb325SJeff Bonwick zio_reexecute(zio_t *pio) 1739e14bb325SJeff Bonwick { 1740a3f829aeSBill Moore zio_t *cio, *cio_next; 1741a3f829aeSBill Moore 1742a3f829aeSBill Moore ASSERT(pio->io_child_type == ZIO_CHILD_LOGICAL); 1743a3f829aeSBill Moore ASSERT(pio->io_orig_stage == ZIO_STAGE_OPEN); 1744f5383399SBill Moore ASSERT(pio->io_gang_leader == NULL); 1745f5383399SBill Moore ASSERT(pio->io_gang_tree == NULL); 1746e05725b1Sbonwick 1747e14bb325SJeff Bonwick pio->io_flags = pio->io_orig_flags; 1748e14bb325SJeff Bonwick pio->io_stage = pio->io_orig_stage; 1749e14bb325SJeff Bonwick pio->io_pipeline = pio->io_orig_pipeline; 1750e14bb325SJeff Bonwick pio->io_reexecute = 0; 175180901aeaSGeorge Wilson pio->io_flags |= ZIO_FLAG_REEXECUTED; 17520f7643c7SGeorge Wilson pio->io_pipeline_trace = 0; 1753e14bb325SJeff Bonwick pio->io_error = 0; 1754a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1755a3f829aeSBill Moore pio->io_state[w] = 0; 1756e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 1757e14bb325SJeff Bonwick pio->io_child_error[c] = 0; 17580a4e9518Sgw 1759b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(pio)) 1760b24ab676SJeff Bonwick BP_ZERO(pio->io_bp); 1761d58459f4Sek 1762e14bb325SJeff Bonwick /* 1763e14bb325SJeff Bonwick * As we reexecute pio's children, new children could be created. 1764a3f829aeSBill Moore * New children go to the head of pio's io_child_list, however, 1765e14bb325SJeff Bonwick * so we will (correctly) not reexecute them. The key is that 1766a3f829aeSBill Moore * the remainder of pio's io_child_list, from 'cio_next' onward, 1767a3f829aeSBill Moore * cannot be affected by any side effects of reexecuting 'cio'. 1768e14bb325SJeff Bonwick */ 17690f7643c7SGeorge Wilson zio_link_t *zl = NULL; 17700f7643c7SGeorge Wilson for (cio = zio_walk_children(pio, &zl); cio != NULL; cio = cio_next) { 17710f7643c7SGeorge Wilson cio_next = zio_walk_children(pio, &zl); 1772e14bb325SJeff Bonwick mutex_enter(&pio->io_lock); 1773a3f829aeSBill Moore for (int w = 0; w < ZIO_WAIT_TYPES; w++) 1774a3f829aeSBill Moore pio->io_children[cio->io_child_type][w]++; 1775e14bb325SJeff Bonwick mutex_exit(&pio->io_lock); 1776a3f829aeSBill Moore zio_reexecute(cio); 1777fa9e4066Sahrens } 1778e05725b1Sbonwick 1779e14bb325SJeff Bonwick /* 1780e14bb325SJeff Bonwick * Now that all children have been reexecuted, execute the parent. 178154d692b7SGeorge Wilson * We don't reexecute "The Godfather" I/O here as it's the 178248bbca81SDaniel Hoffman * responsibility of the caller to wait on it. 1783e14bb325SJeff Bonwick */ 17840f7643c7SGeorge Wilson if (!(pio->io_flags & ZIO_FLAG_GODFATHER)) { 17850f7643c7SGeorge Wilson pio->io_queued_timestamp = gethrtime(); 178654d692b7SGeorge Wilson zio_execute(pio); 17870f7643c7SGeorge Wilson } 17880a4e9518Sgw } 17890a4e9518Sgw 1790e14bb325SJeff Bonwick void 1791e14bb325SJeff Bonwick zio_suspend(spa_t *spa, zio_t *zio) 17920a4e9518Sgw { 1793e14bb325SJeff Bonwick if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC) 1794e14bb325SJeff Bonwick fm_panic("Pool '%s' has encountered an uncorrectable I/O " 1795e14bb325SJeff Bonwick "failure and the failure mode property for this pool " 1796e14bb325SJeff Bonwick "is set to panic.", spa_name(spa)); 17970a4e9518Sgw 1798e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO_FAILURE, spa, NULL, NULL, 0, 0); 17990a4e9518Sgw 1800e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1801fa9e4066Sahrens 1802e14bb325SJeff Bonwick if (spa->spa_suspend_zio_root == NULL) 180354d692b7SGeorge Wilson spa->spa_suspend_zio_root = zio_root(spa, NULL, NULL, 180454d692b7SGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 180554d692b7SGeorge Wilson ZIO_FLAG_GODFATHER); 1806fa9e4066Sahrens 1807e14bb325SJeff Bonwick spa->spa_suspended = B_TRUE; 1808fa9e4066Sahrens 1809e14bb325SJeff Bonwick if (zio != NULL) { 181054d692b7SGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 1811e14bb325SJeff Bonwick ASSERT(zio != spa->spa_suspend_zio_root); 1812e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 1813a3f829aeSBill Moore ASSERT(zio_unique_parent(zio) == NULL); 1814e14bb325SJeff Bonwick ASSERT(zio->io_stage == ZIO_STAGE_DONE); 1815e14bb325SJeff Bonwick zio_add_child(spa->spa_suspend_zio_root, zio); 1816e14bb325SJeff Bonwick } 1817fa9e4066Sahrens 1818e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1819e14bb325SJeff Bonwick } 1820fa9e4066Sahrens 182154d692b7SGeorge Wilson int 1822e14bb325SJeff Bonwick zio_resume(spa_t *spa) 1823e14bb325SJeff Bonwick { 182454d692b7SGeorge Wilson zio_t *pio; 1825fa9e4066Sahrens 1826b3995adbSahrens /* 1827e14bb325SJeff Bonwick * Reexecute all previously suspended i/o. 1828b3995adbSahrens */ 1829e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1830e14bb325SJeff Bonwick spa->spa_suspended = B_FALSE; 1831e14bb325SJeff Bonwick cv_broadcast(&spa->spa_suspend_cv); 1832e14bb325SJeff Bonwick pio = spa->spa_suspend_zio_root; 1833e14bb325SJeff Bonwick spa->spa_suspend_zio_root = NULL; 1834e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1835e14bb325SJeff Bonwick 1836e14bb325SJeff Bonwick if (pio == NULL) 183754d692b7SGeorge Wilson return (0); 1838e14bb325SJeff Bonwick 183954d692b7SGeorge Wilson zio_reexecute(pio); 184054d692b7SGeorge Wilson return (zio_wait(pio)); 1841e14bb325SJeff Bonwick } 1842e14bb325SJeff Bonwick 1843e14bb325SJeff Bonwick void 1844e14bb325SJeff Bonwick zio_resume_wait(spa_t *spa) 1845e14bb325SJeff Bonwick { 1846e14bb325SJeff Bonwick mutex_enter(&spa->spa_suspend_lock); 1847e14bb325SJeff Bonwick while (spa_suspended(spa)) 1848e14bb325SJeff Bonwick cv_wait(&spa->spa_suspend_cv, &spa->spa_suspend_lock); 1849e14bb325SJeff Bonwick mutex_exit(&spa->spa_suspend_lock); 1850fa9e4066Sahrens } 1851fa9e4066Sahrens 1852fa9e4066Sahrens /* 1853fa9e4066Sahrens * ========================================================================== 1854e14bb325SJeff Bonwick * Gang blocks. 1855e14bb325SJeff Bonwick * 1856e14bb325SJeff Bonwick * A gang block is a collection of small blocks that looks to the DMU 1857e14bb325SJeff Bonwick * like one large block. When zio_dva_allocate() cannot find a block 1858e14bb325SJeff Bonwick * of the requested size, due to either severe fragmentation or the pool 1859e14bb325SJeff Bonwick * being nearly full, it calls zio_write_gang_block() to construct the 1860e14bb325SJeff Bonwick * block from smaller fragments. 1861e14bb325SJeff Bonwick * 1862e14bb325SJeff Bonwick * A gang block consists of a gang header (zio_gbh_phys_t) and up to 1863e14bb325SJeff Bonwick * three (SPA_GBH_NBLKPTRS) gang members. The gang header is just like 1864e14bb325SJeff Bonwick * an indirect block: it's an array of block pointers. It consumes 1865e14bb325SJeff Bonwick * only one sector and hence is allocatable regardless of fragmentation. 1866e14bb325SJeff Bonwick * The gang header's bps point to its gang members, which hold the data. 1867e14bb325SJeff Bonwick * 1868e14bb325SJeff Bonwick * Gang blocks are self-checksumming, using the bp's <vdev, offset, txg> 1869e14bb325SJeff Bonwick * as the verifier to ensure uniqueness of the SHA256 checksum. 1870e14bb325SJeff Bonwick * Critically, the gang block bp's blk_cksum is the checksum of the data, 1871e14bb325SJeff Bonwick * not the gang header. This ensures that data block signatures (needed for 1872e14bb325SJeff Bonwick * deduplication) are independent of how the block is physically stored. 1873e14bb325SJeff Bonwick * 1874e14bb325SJeff Bonwick * Gang blocks can be nested: a gang member may itself be a gang block. 1875e14bb325SJeff Bonwick * Thus every gang block is a tree in which root and all interior nodes are 1876e14bb325SJeff Bonwick * gang headers, and the leaves are normal blocks that contain user data. 1877e14bb325SJeff Bonwick * The root of the gang tree is called the gang leader. 1878e14bb325SJeff Bonwick * 1879e14bb325SJeff Bonwick * To perform any operation (read, rewrite, free, claim) on a gang block, 1880e14bb325SJeff Bonwick * zio_gang_assemble() first assembles the gang tree (minus data leaves) 1881e14bb325SJeff Bonwick * in the io_gang_tree field of the original logical i/o by recursively 1882e14bb325SJeff Bonwick * reading the gang leader and all gang headers below it. This yields 1883e14bb325SJeff Bonwick * an in-core tree containing the contents of every gang header and the 1884e14bb325SJeff Bonwick * bps for every constituent of the gang block. 1885e14bb325SJeff Bonwick * 1886e14bb325SJeff Bonwick * With the gang tree now assembled, zio_gang_issue() just walks the gang tree 1887e14bb325SJeff Bonwick * and invokes a callback on each bp. To free a gang block, zio_gang_issue() 1888e14bb325SJeff Bonwick * calls zio_free_gang() -- a trivial wrapper around zio_free() -- for each bp. 1889e14bb325SJeff Bonwick * zio_claim_gang() provides a similarly trivial wrapper for zio_claim(). 1890e14bb325SJeff Bonwick * zio_read_gang() is a wrapper around zio_read() that omits reading gang 1891e14bb325SJeff Bonwick * headers, since we already have those in io_gang_tree. zio_rewrite_gang() 1892e14bb325SJeff Bonwick * performs a zio_rewrite() of the data or, for gang headers, a zio_rewrite() 1893e14bb325SJeff Bonwick * of the gang header plus zio_checksum_compute() of the data to update the 1894e14bb325SJeff Bonwick * gang header's blk_cksum as described above. 1895e14bb325SJeff Bonwick * 1896e14bb325SJeff Bonwick * The two-phase assemble/issue model solves the problem of partial failure -- 1897e14bb325SJeff Bonwick * what if you'd freed part of a gang block but then couldn't read the 1898e14bb325SJeff Bonwick * gang header for another part? Assembling the entire gang tree first 1899e14bb325SJeff Bonwick * ensures that all the necessary gang header I/O has succeeded before 1900e14bb325SJeff Bonwick * starting the actual work of free, claim, or write. Once the gang tree 1901e14bb325SJeff Bonwick * is assembled, free and claim are in-memory operations that cannot fail. 1902e14bb325SJeff Bonwick * 1903e14bb325SJeff Bonwick * In the event that a gang write fails, zio_dva_unallocate() walks the 1904e14bb325SJeff Bonwick * gang tree to immediately free (i.e. insert back into the space map) 1905e14bb325SJeff Bonwick * everything we've allocated. This ensures that we don't get ENOSPC 1906e14bb325SJeff Bonwick * errors during repeated suspend/resume cycles due to a flaky device. 1907e14bb325SJeff Bonwick * 1908e14bb325SJeff Bonwick * Gang rewrites only happen during sync-to-convergence. If we can't assemble 1909e14bb325SJeff Bonwick * the gang tree, we won't modify the block, so we can safely defer the free 1910e14bb325SJeff Bonwick * (knowing that the block is still intact). If we *can* assemble the gang 1911e14bb325SJeff Bonwick * tree, then even if some of the rewrites fail, zio_dva_unallocate() will free 1912e14bb325SJeff Bonwick * each constituent bp and we can allocate a new block on the next sync pass. 1913e14bb325SJeff Bonwick * 1914e14bb325SJeff Bonwick * In all cases, the gang tree allows complete recovery from partial failure. 1915fa9e4066Sahrens * ========================================================================== 1916fa9e4066Sahrens */ 1917e14bb325SJeff Bonwick 1918770499e1SDan Kimmel static void 1919770499e1SDan Kimmel zio_gang_issue_func_done(zio_t *zio) 1920770499e1SDan Kimmel { 1921770499e1SDan Kimmel abd_put(zio->io_abd); 1922770499e1SDan Kimmel } 1923770499e1SDan Kimmel 1924e14bb325SJeff Bonwick static zio_t * 1925770499e1SDan Kimmel zio_read_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data, 1926770499e1SDan Kimmel uint64_t offset) 1927fa9e4066Sahrens { 1928e14bb325SJeff Bonwick if (gn != NULL) 1929e14bb325SJeff Bonwick return (pio); 1930fa9e4066Sahrens 1931770499e1SDan Kimmel return (zio_read(pio, pio->io_spa, bp, abd_get_offset(data, offset), 1932770499e1SDan Kimmel BP_GET_PSIZE(bp), zio_gang_issue_func_done, 1933770499e1SDan Kimmel NULL, pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1934e14bb325SJeff Bonwick &pio->io_bookmark)); 1935e14bb325SJeff Bonwick } 1936e14bb325SJeff Bonwick 1937770499e1SDan Kimmel static zio_t * 1938770499e1SDan Kimmel zio_rewrite_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data, 1939770499e1SDan Kimmel uint64_t offset) 1940e14bb325SJeff Bonwick { 1941e14bb325SJeff Bonwick zio_t *zio; 1942e14bb325SJeff Bonwick 1943e14bb325SJeff Bonwick if (gn != NULL) { 1944770499e1SDan Kimmel abd_t *gbh_abd = 1945770499e1SDan Kimmel abd_get_from_buf(gn->gn_gbh, SPA_GANGBLOCKSIZE); 1946e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1947770499e1SDan Kimmel gbh_abd, SPA_GANGBLOCKSIZE, zio_gang_issue_func_done, NULL, 1948770499e1SDan Kimmel pio->io_priority, ZIO_GANG_CHILD_FLAGS(pio), 1949770499e1SDan Kimmel &pio->io_bookmark); 1950fa9e4066Sahrens /* 1951e14bb325SJeff Bonwick * As we rewrite each gang header, the pipeline will compute 1952e14bb325SJeff Bonwick * a new gang block header checksum for it; but no one will 1953e14bb325SJeff Bonwick * compute a new data checksum, so we do that here. The one 1954e14bb325SJeff Bonwick * exception is the gang leader: the pipeline already computed 1955e14bb325SJeff Bonwick * its data checksum because that stage precedes gang assembly. 1956e14bb325SJeff Bonwick * (Presently, nothing actually uses interior data checksums; 1957e14bb325SJeff Bonwick * this is just good hygiene.) 1958fa9e4066Sahrens */ 1959f5383399SBill Moore if (gn != pio->io_gang_leader->io_gang_tree) { 1960770499e1SDan Kimmel abd_t *buf = abd_get_offset(data, offset); 1961770499e1SDan Kimmel 1962e14bb325SJeff Bonwick zio_checksum_compute(zio, BP_GET_CHECKSUM(bp), 1963770499e1SDan Kimmel buf, BP_GET_PSIZE(bp)); 1964770499e1SDan Kimmel 1965770499e1SDan Kimmel abd_put(buf); 1966e14bb325SJeff Bonwick } 1967b24ab676SJeff Bonwick /* 1968b24ab676SJeff Bonwick * If we are here to damage data for testing purposes, 1969b24ab676SJeff Bonwick * leave the GBH alone so that we can detect the damage. 1970b24ab676SJeff Bonwick */ 1971b24ab676SJeff Bonwick if (pio->io_gang_leader->io_flags & ZIO_FLAG_INDUCE_DAMAGE) 1972b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 1973fa9e4066Sahrens } else { 1974e14bb325SJeff Bonwick zio = zio_rewrite(pio, pio->io_spa, pio->io_txg, bp, 1975770499e1SDan Kimmel abd_get_offset(data, offset), BP_GET_PSIZE(bp), 1976770499e1SDan Kimmel zio_gang_issue_func_done, NULL, pio->io_priority, 1977e14bb325SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 1978fa9e4066Sahrens } 1979fa9e4066Sahrens 1980e14bb325SJeff Bonwick return (zio); 1981e14bb325SJeff Bonwick } 1982fa9e4066Sahrens 1983e14bb325SJeff Bonwick /* ARGSUSED */ 1984770499e1SDan Kimmel static zio_t * 1985770499e1SDan Kimmel zio_free_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data, 1986770499e1SDan Kimmel uint64_t offset) 1987e14bb325SJeff Bonwick { 1988b24ab676SJeff Bonwick return (zio_free_sync(pio, pio->io_spa, pio->io_txg, bp, 1989b24ab676SJeff Bonwick ZIO_GANG_CHILD_FLAGS(pio))); 1990fa9e4066Sahrens } 1991fa9e4066Sahrens 1992e14bb325SJeff Bonwick /* ARGSUSED */ 1993770499e1SDan Kimmel static zio_t * 1994770499e1SDan Kimmel zio_claim_gang(zio_t *pio, blkptr_t *bp, zio_gang_node_t *gn, abd_t *data, 1995770499e1SDan Kimmel uint64_t offset) 1996fa9e4066Sahrens { 1997e14bb325SJeff Bonwick return (zio_claim(pio, pio->io_spa, pio->io_txg, bp, 1998e14bb325SJeff Bonwick NULL, NULL, ZIO_GANG_CHILD_FLAGS(pio))); 1999e14bb325SJeff Bonwick } 2000fa9e4066Sahrens 2001e14bb325SJeff Bonwick static zio_gang_issue_func_t *zio_gang_issue_func[ZIO_TYPES] = { 2002e14bb325SJeff Bonwick NULL, 2003e14bb325SJeff Bonwick zio_read_gang, 2004e14bb325SJeff Bonwick zio_rewrite_gang, 2005e14bb325SJeff Bonwick zio_free_gang, 2006e14bb325SJeff Bonwick zio_claim_gang, 2007e14bb325SJeff Bonwick NULL 2008e14bb325SJeff Bonwick }; 2009fa9e4066Sahrens 2010e14bb325SJeff Bonwick static void zio_gang_tree_assemble_done(zio_t *zio); 2011fa9e4066Sahrens 2012e14bb325SJeff Bonwick static zio_gang_node_t * 2013e14bb325SJeff Bonwick zio_gang_node_alloc(zio_gang_node_t **gnpp) 2014e14bb325SJeff Bonwick { 2015e14bb325SJeff Bonwick zio_gang_node_t *gn; 2016fa9e4066Sahrens 2017e14bb325SJeff Bonwick ASSERT(*gnpp == NULL); 2018fa9e4066Sahrens 2019e14bb325SJeff Bonwick gn = kmem_zalloc(sizeof (*gn), KM_SLEEP); 2020e14bb325SJeff Bonwick gn->gn_gbh = zio_buf_alloc(SPA_GANGBLOCKSIZE); 2021e14bb325SJeff Bonwick *gnpp = gn; 2022e14bb325SJeff Bonwick 2023e14bb325SJeff Bonwick return (gn); 2024fa9e4066Sahrens } 2025fa9e4066Sahrens 2026fa9e4066Sahrens static void 2027e14bb325SJeff Bonwick zio_gang_node_free(zio_gang_node_t **gnpp) 2028fa9e4066Sahrens { 2029e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 2030fa9e4066Sahrens 2031e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 2032e14bb325SJeff Bonwick ASSERT(gn->gn_child[g] == NULL); 2033e14bb325SJeff Bonwick 2034e14bb325SJeff Bonwick zio_buf_free(gn->gn_gbh, SPA_GANGBLOCKSIZE); 2035e14bb325SJeff Bonwick kmem_free(gn, sizeof (*gn)); 2036e14bb325SJeff Bonwick *gnpp = NULL; 2037fa9e4066Sahrens } 2038fa9e4066Sahrens 2039e14bb325SJeff Bonwick static void 2040e14bb325SJeff Bonwick zio_gang_tree_free(zio_gang_node_t **gnpp) 2041fa9e4066Sahrens { 2042e14bb325SJeff Bonwick zio_gang_node_t *gn = *gnpp; 2043fa9e4066Sahrens 2044e14bb325SJeff Bonwick if (gn == NULL) 2045e14bb325SJeff Bonwick return; 2046fa9e4066Sahrens 2047e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) 2048e14bb325SJeff Bonwick zio_gang_tree_free(&gn->gn_child[g]); 2049fa9e4066Sahrens 2050e14bb325SJeff Bonwick zio_gang_node_free(gnpp); 2051fa9e4066Sahrens } 2052fa9e4066Sahrens 2053e14bb325SJeff Bonwick static void 2054f5383399SBill Moore zio_gang_tree_assemble(zio_t *gio, blkptr_t *bp, zio_gang_node_t **gnpp) 2055fa9e4066Sahrens { 2056e14bb325SJeff Bonwick zio_gang_node_t *gn = zio_gang_node_alloc(gnpp); 2057770499e1SDan Kimmel abd_t *gbh_abd = abd_get_from_buf(gn->gn_gbh, SPA_GANGBLOCKSIZE); 2058e14bb325SJeff Bonwick 2059f5383399SBill Moore ASSERT(gio->io_gang_leader == gio); 2060e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp)); 2061fa9e4066Sahrens 2062770499e1SDan Kimmel zio_nowait(zio_read(gio, gio->io_spa, bp, gbh_abd, SPA_GANGBLOCKSIZE, 2063770499e1SDan Kimmel zio_gang_tree_assemble_done, gn, gio->io_priority, 2064770499e1SDan Kimmel ZIO_GANG_CHILD_FLAGS(gio), &gio->io_bookmark)); 2065e14bb325SJeff Bonwick } 2066fa9e4066Sahrens 2067e14bb325SJeff Bonwick static void 2068e14bb325SJeff Bonwick zio_gang_tree_assemble_done(zio_t *zio) 2069e14bb325SJeff Bonwick { 2070f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 2071e14bb325SJeff Bonwick zio_gang_node_t *gn = zio->io_private; 2072e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2073fa9e4066Sahrens 2074f5383399SBill Moore ASSERT(gio == zio_unique_parent(zio)); 2075b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 2076fa9e4066Sahrens 2077e14bb325SJeff Bonwick if (zio->io_error) 2078e14bb325SJeff Bonwick return; 2079fa9e4066Sahrens 2080770499e1SDan Kimmel /* this ABD was created from a linear buf in zio_gang_tree_assemble */ 2081e14bb325SJeff Bonwick if (BP_SHOULD_BYTESWAP(bp)) 2082770499e1SDan Kimmel byteswap_uint64_array(abd_to_buf(zio->io_abd), zio->io_size); 2083fa9e4066Sahrens 2084770499e1SDan Kimmel ASSERT3P(abd_to_buf(zio->io_abd), ==, gn->gn_gbh); 2085e14bb325SJeff Bonwick ASSERT(zio->io_size == SPA_GANGBLOCKSIZE); 20866e1f5caaSNeil Perrin ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); 2087e05725b1Sbonwick 2088770499e1SDan Kimmel abd_put(zio->io_abd); 2089770499e1SDan Kimmel 2090e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 2091e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 2092e14bb325SJeff Bonwick if (!BP_IS_GANG(gbp)) 2093e14bb325SJeff Bonwick continue; 2094f5383399SBill Moore zio_gang_tree_assemble(gio, gbp, &gn->gn_child[g]); 2095e14bb325SJeff Bonwick } 2096fa9e4066Sahrens } 2097fa9e4066Sahrens 2098e14bb325SJeff Bonwick static void 2099770499e1SDan Kimmel zio_gang_tree_issue(zio_t *pio, zio_gang_node_t *gn, blkptr_t *bp, abd_t *data, 2100770499e1SDan Kimmel uint64_t offset) 2101fa9e4066Sahrens { 2102f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 2103e14bb325SJeff Bonwick zio_t *zio; 2104fa9e4066Sahrens 2105e14bb325SJeff Bonwick ASSERT(BP_IS_GANG(bp) == !!gn); 2106f5383399SBill Moore ASSERT(BP_GET_CHECKSUM(bp) == BP_GET_CHECKSUM(gio->io_bp)); 2107f5383399SBill Moore ASSERT(BP_GET_LSIZE(bp) == BP_GET_PSIZE(bp) || gn == gio->io_gang_tree); 2108fa9e4066Sahrens 2109e14bb325SJeff Bonwick /* 2110e14bb325SJeff Bonwick * If you're a gang header, your data is in gn->gn_gbh. 2111e14bb325SJeff Bonwick * If you're a gang member, your data is in 'data' and gn == NULL. 2112e14bb325SJeff Bonwick */ 2113770499e1SDan Kimmel zio = zio_gang_issue_func[gio->io_type](pio, bp, gn, data, offset); 2114fa9e4066Sahrens 2115e14bb325SJeff Bonwick if (gn != NULL) { 21166e1f5caaSNeil Perrin ASSERT(gn->gn_gbh->zg_tail.zec_magic == ZEC_MAGIC); 2117fa9e4066Sahrens 2118e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 2119e14bb325SJeff Bonwick blkptr_t *gbp = &gn->gn_gbh->zg_blkptr[g]; 2120e14bb325SJeff Bonwick if (BP_IS_HOLE(gbp)) 2121e14bb325SJeff Bonwick continue; 2122770499e1SDan Kimmel zio_gang_tree_issue(zio, gn->gn_child[g], gbp, data, 2123770499e1SDan Kimmel offset); 2124770499e1SDan Kimmel offset += BP_GET_PSIZE(gbp); 2125e14bb325SJeff Bonwick } 2126fa9e4066Sahrens } 2127fa9e4066Sahrens 2128f5383399SBill Moore if (gn == gio->io_gang_tree) 2129770499e1SDan Kimmel ASSERT3U(gio->io_size, ==, offset); 2130e05725b1Sbonwick 2131e14bb325SJeff Bonwick if (zio != pio) 2132e14bb325SJeff Bonwick zio_nowait(zio); 2133fa9e4066Sahrens } 2134fa9e4066Sahrens 2135e05725b1Sbonwick static int 2136e14bb325SJeff Bonwick zio_gang_assemble(zio_t *zio) 2137fa9e4066Sahrens { 2138e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2139fa9e4066Sahrens 2140f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == NULL); 2141f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 2142f5383399SBill Moore 2143f5383399SBill Moore zio->io_gang_leader = zio; 2144fa9e4066Sahrens 2145e14bb325SJeff Bonwick zio_gang_tree_assemble(zio, bp, &zio->io_gang_tree); 2146e05725b1Sbonwick 2147e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2148fa9e4066Sahrens } 2149fa9e4066Sahrens 2150e05725b1Sbonwick static int 2151e14bb325SJeff Bonwick zio_gang_issue(zio_t *zio) 2152fa9e4066Sahrens { 2153e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2154fa9e4066Sahrens 2155d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_GANG_BIT, ZIO_WAIT_DONE)) { 2156e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 2157d6e1c446SGeorge Wilson } 2158fa9e4066Sahrens 2159f5383399SBill Moore ASSERT(BP_IS_GANG(bp) && zio->io_gang_leader == zio); 2160f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 2161fa9e4066Sahrens 2162e14bb325SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_GANG] == 0) 2163770499e1SDan Kimmel zio_gang_tree_issue(zio, zio->io_gang_tree, bp, zio->io_abd, 2164770499e1SDan Kimmel 0); 2165e14bb325SJeff Bonwick else 2166f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 2167fa9e4066Sahrens 2168e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2169e05725b1Sbonwick 2170e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2171fa9e4066Sahrens } 2172fa9e4066Sahrens 2173fa9e4066Sahrens static void 2174e14bb325SJeff Bonwick zio_write_gang_member_ready(zio_t *zio) 2175fa9e4066Sahrens { 2176a3f829aeSBill Moore zio_t *pio = zio_unique_parent(zio); 2177f5383399SBill Moore zio_t *gio = zio->io_gang_leader; 217844cd46caSbillm dva_t *cdva = zio->io_bp->blk_dva; 217944cd46caSbillm dva_t *pdva = pio->io_bp->blk_dva; 2180fa9e4066Sahrens uint64_t asize; 2181fa9e4066Sahrens 2182e14bb325SJeff Bonwick if (BP_IS_HOLE(zio->io_bp)) 2183e14bb325SJeff Bonwick return; 2184e14bb325SJeff Bonwick 2185e14bb325SJeff Bonwick ASSERT(BP_IS_HOLE(&zio->io_bp_orig)); 2186e14bb325SJeff Bonwick 2187e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_GANG); 2188b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, ==, gio->io_prop.zp_copies); 2189b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(zio->io_bp)); 2190b24ab676SJeff Bonwick ASSERT3U(pio->io_prop.zp_copies, <=, BP_GET_NDVAS(pio->io_bp)); 219144cd46caSbillm ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp)); 2192fa9e4066Sahrens 2193fa9e4066Sahrens mutex_enter(&pio->io_lock); 2194e14bb325SJeff Bonwick for (int d = 0; d < BP_GET_NDVAS(zio->io_bp); d++) { 219544cd46caSbillm ASSERT(DVA_GET_GANG(&pdva[d])); 219644cd46caSbillm asize = DVA_GET_ASIZE(&pdva[d]); 219744cd46caSbillm asize += DVA_GET_ASIZE(&cdva[d]); 219844cd46caSbillm DVA_SET_ASIZE(&pdva[d], asize); 219944cd46caSbillm } 2200fa9e4066Sahrens mutex_exit(&pio->io_lock); 2201fa9e4066Sahrens } 2202fa9e4066Sahrens 2203770499e1SDan Kimmel static void 2204770499e1SDan Kimmel zio_write_gang_done(zio_t *zio) 2205770499e1SDan Kimmel { 2206770499e1SDan Kimmel abd_put(zio->io_abd); 2207770499e1SDan Kimmel } 2208770499e1SDan Kimmel 22090a4e9518Sgw static int 2210e14bb325SJeff Bonwick zio_write_gang_block(zio_t *pio) 2211fa9e4066Sahrens { 2212e14bb325SJeff Bonwick spa_t *spa = pio->io_spa; 22130f7643c7SGeorge Wilson metaslab_class_t *mc = spa_normal_class(spa); 2214e14bb325SJeff Bonwick blkptr_t *bp = pio->io_bp; 2215f5383399SBill Moore zio_t *gio = pio->io_gang_leader; 2216e14bb325SJeff Bonwick zio_t *zio; 2217e14bb325SJeff Bonwick zio_gang_node_t *gn, **gnpp; 2218fa9e4066Sahrens zio_gbh_phys_t *gbh; 2219770499e1SDan Kimmel abd_t *gbh_abd; 2220e14bb325SJeff Bonwick uint64_t txg = pio->io_txg; 2221e14bb325SJeff Bonwick uint64_t resid = pio->io_size; 2222e14bb325SJeff Bonwick uint64_t lsize; 2223b24ab676SJeff Bonwick int copies = gio->io_prop.zp_copies; 2224b24ab676SJeff Bonwick int gbh_copies = MIN(copies + 1, spa_max_replication(spa)); 2225e14bb325SJeff Bonwick zio_prop_t zp; 2226fa9e4066Sahrens int error; 2227fa9e4066Sahrens 22280f7643c7SGeorge Wilson int flags = METASLAB_HINTBP_FAVOR | METASLAB_GANG_HEADER; 22290f7643c7SGeorge Wilson if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) { 22300f7643c7SGeorge Wilson ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); 22310f7643c7SGeorge Wilson ASSERT(!(pio->io_flags & ZIO_FLAG_NODATA)); 22320f7643c7SGeorge Wilson 22330f7643c7SGeorge Wilson flags |= METASLAB_ASYNC_ALLOC; 2234*f78cdc34SPaul Dagnelie VERIFY(refcount_held(&mc->mc_alloc_slots[pio->io_allocator], 2235*f78cdc34SPaul Dagnelie pio)); 22360f7643c7SGeorge Wilson 22370f7643c7SGeorge Wilson /* 22380f7643c7SGeorge Wilson * The logical zio has already placed a reservation for 22390f7643c7SGeorge Wilson * 'copies' allocation slots but gang blocks may require 22400f7643c7SGeorge Wilson * additional copies. These additional copies 22410f7643c7SGeorge Wilson * (i.e. gbh_copies - copies) are guaranteed to succeed 22420f7643c7SGeorge Wilson * since metaslab_class_throttle_reserve() always allows 22430f7643c7SGeorge Wilson * additional reservations for gang blocks. 22440f7643c7SGeorge Wilson */ 22450f7643c7SGeorge Wilson VERIFY(metaslab_class_throttle_reserve(mc, gbh_copies - copies, 2246*f78cdc34SPaul Dagnelie pio->io_allocator, pio, flags)); 22470f7643c7SGeorge Wilson } 22480f7643c7SGeorge Wilson 22490f7643c7SGeorge Wilson error = metaslab_alloc(spa, mc, SPA_GANGBLOCKSIZE, 22508363e80aSGeorge Wilson bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, flags, 2251*f78cdc34SPaul Dagnelie &pio->io_alloc_list, pio, pio->io_allocator); 2252e05725b1Sbonwick if (error) { 22530f7643c7SGeorge Wilson if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) { 22540f7643c7SGeorge Wilson ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); 22550f7643c7SGeorge Wilson ASSERT(!(pio->io_flags & ZIO_FLAG_NODATA)); 22560f7643c7SGeorge Wilson 22570f7643c7SGeorge Wilson /* 22580f7643c7SGeorge Wilson * If we failed to allocate the gang block header then 22590f7643c7SGeorge Wilson * we remove any additional allocation reservations that 22600f7643c7SGeorge Wilson * we placed here. The original reservation will 22610f7643c7SGeorge Wilson * be removed when the logical I/O goes to the ready 22620f7643c7SGeorge Wilson * stage. 22630f7643c7SGeorge Wilson */ 22640f7643c7SGeorge Wilson metaslab_class_throttle_unreserve(mc, 2265*f78cdc34SPaul Dagnelie gbh_copies - copies, pio->io_allocator, pio); 22660f7643c7SGeorge Wilson } 2267e14bb325SJeff Bonwick pio->io_error = error; 2268e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2269e05725b1Sbonwick } 2270fa9e4066Sahrens 2271f5383399SBill Moore if (pio == gio) { 2272f5383399SBill Moore gnpp = &gio->io_gang_tree; 2273e14bb325SJeff Bonwick } else { 2274e14bb325SJeff Bonwick gnpp = pio->io_private; 2275e14bb325SJeff Bonwick ASSERT(pio->io_ready == zio_write_gang_member_ready); 2276fa9e4066Sahrens } 2277fa9e4066Sahrens 2278e14bb325SJeff Bonwick gn = zio_gang_node_alloc(gnpp); 2279e14bb325SJeff Bonwick gbh = gn->gn_gbh; 2280e14bb325SJeff Bonwick bzero(gbh, SPA_GANGBLOCKSIZE); 2281770499e1SDan Kimmel gbh_abd = abd_get_from_buf(gbh, SPA_GANGBLOCKSIZE); 2282fa9e4066Sahrens 2283e14bb325SJeff Bonwick /* 2284e14bb325SJeff Bonwick * Create the gang header. 2285e14bb325SJeff Bonwick */ 2286770499e1SDan Kimmel zio = zio_rewrite(pio, spa, txg, bp, gbh_abd, SPA_GANGBLOCKSIZE, 2287770499e1SDan Kimmel zio_write_gang_done, NULL, pio->io_priority, 2288770499e1SDan Kimmel ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 2289fa9e4066Sahrens 2290e14bb325SJeff Bonwick /* 2291e14bb325SJeff Bonwick * Create and nowait the gang children. 2292e14bb325SJeff Bonwick */ 2293e14bb325SJeff Bonwick for (int g = 0; resid != 0; resid -= lsize, g++) { 2294e14bb325SJeff Bonwick lsize = P2ROUNDUP(resid / (SPA_GBH_NBLKPTRS - g), 2295e14bb325SJeff Bonwick SPA_MINBLOCKSIZE); 2296e14bb325SJeff Bonwick ASSERT(lsize >= SPA_MINBLOCKSIZE && lsize <= resid); 2297e14bb325SJeff Bonwick 2298f5383399SBill Moore zp.zp_checksum = gio->io_prop.zp_checksum; 2299e14bb325SJeff Bonwick zp.zp_compress = ZIO_COMPRESS_OFF; 2300e14bb325SJeff Bonwick zp.zp_type = DMU_OT_NONE; 2301e14bb325SJeff Bonwick zp.zp_level = 0; 2302b24ab676SJeff Bonwick zp.zp_copies = gio->io_prop.zp_copies; 230380901aeaSGeorge Wilson zp.zp_dedup = B_FALSE; 230480901aeaSGeorge Wilson zp.zp_dedup_verify = B_FALSE; 230580901aeaSGeorge Wilson zp.zp_nopwrite = B_FALSE; 2306e14bb325SJeff Bonwick 23070f7643c7SGeorge Wilson zio_t *cio = zio_write(zio, spa, txg, &gbh->zg_blkptr[g], 2308770499e1SDan Kimmel abd_get_offset(pio->io_abd, pio->io_size - resid), lsize, 2309770499e1SDan Kimmel lsize, &zp, zio_write_gang_member_ready, NULL, NULL, 2310770499e1SDan Kimmel zio_write_gang_done, &gn->gn_child[g], pio->io_priority, 23110f7643c7SGeorge Wilson ZIO_GANG_CHILD_FLAGS(pio), &pio->io_bookmark); 23120f7643c7SGeorge Wilson 23130f7643c7SGeorge Wilson if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) { 23140f7643c7SGeorge Wilson ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); 23150f7643c7SGeorge Wilson ASSERT(!(pio->io_flags & ZIO_FLAG_NODATA)); 23160f7643c7SGeorge Wilson 23170f7643c7SGeorge Wilson /* 23180f7643c7SGeorge Wilson * Gang children won't throttle but we should 23190f7643c7SGeorge Wilson * account for their work, so reserve an allocation 23200f7643c7SGeorge Wilson * slot for them here. 23210f7643c7SGeorge Wilson */ 23220f7643c7SGeorge Wilson VERIFY(metaslab_class_throttle_reserve(mc, 2323*f78cdc34SPaul Dagnelie zp.zp_copies, cio->io_allocator, cio, flags)); 23240f7643c7SGeorge Wilson } 23250f7643c7SGeorge Wilson zio_nowait(cio); 2326e14bb325SJeff Bonwick } 2327e05725b1Sbonwick 232844cd46caSbillm /* 2329e14bb325SJeff Bonwick * Set pio's pipeline to just wait for zio to finish. 233044cd46caSbillm */ 2331e14bb325SJeff Bonwick pio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 2332e14bb325SJeff Bonwick 2333e14bb325SJeff Bonwick zio_nowait(zio); 2334e14bb325SJeff Bonwick 2335e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2336fa9e4066Sahrens } 2337fa9e4066Sahrens 233880901aeaSGeorge Wilson /* 233945818ee1SMatthew Ahrens * The zio_nop_write stage in the pipeline determines if allocating a 234045818ee1SMatthew Ahrens * new bp is necessary. The nopwrite feature can handle writes in 234145818ee1SMatthew Ahrens * either syncing or open context (i.e. zil writes) and as a result is 234245818ee1SMatthew Ahrens * mutually exclusive with dedup. 234345818ee1SMatthew Ahrens * 234445818ee1SMatthew Ahrens * By leveraging a cryptographically secure checksum, such as SHA256, we 234545818ee1SMatthew Ahrens * can compare the checksums of the new data and the old to determine if 234645818ee1SMatthew Ahrens * allocating a new block is required. Note that our requirements for 234745818ee1SMatthew Ahrens * cryptographic strength are fairly weak: there can't be any accidental 234845818ee1SMatthew Ahrens * hash collisions, but we don't need to be secure against intentional 234945818ee1SMatthew Ahrens * (malicious) collisions. To trigger a nopwrite, you have to be able 235045818ee1SMatthew Ahrens * to write the file to begin with, and triggering an incorrect (hash 235145818ee1SMatthew Ahrens * collision) nopwrite is no worse than simply writing to the file. 235245818ee1SMatthew Ahrens * That said, there are no known attacks against the checksum algorithms 235345818ee1SMatthew Ahrens * used for nopwrite, assuming that the salt and the checksums 235445818ee1SMatthew Ahrens * themselves remain secret. 235580901aeaSGeorge Wilson */ 235680901aeaSGeorge Wilson static int 235780901aeaSGeorge Wilson zio_nop_write(zio_t *zio) 235880901aeaSGeorge Wilson { 235980901aeaSGeorge Wilson blkptr_t *bp = zio->io_bp; 236080901aeaSGeorge Wilson blkptr_t *bp_orig = &zio->io_bp_orig; 236180901aeaSGeorge Wilson zio_prop_t *zp = &zio->io_prop; 236280901aeaSGeorge Wilson 236380901aeaSGeorge Wilson ASSERT(BP_GET_LEVEL(bp) == 0); 236480901aeaSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REWRITE)); 236580901aeaSGeorge Wilson ASSERT(zp->zp_nopwrite); 236680901aeaSGeorge Wilson ASSERT(!zp->zp_dedup); 236780901aeaSGeorge Wilson ASSERT(zio->io_bp_override == NULL); 236880901aeaSGeorge Wilson ASSERT(IO_IS_ALLOCATING(zio)); 236980901aeaSGeorge Wilson 237080901aeaSGeorge Wilson /* 237180901aeaSGeorge Wilson * Check to see if the original bp and the new bp have matching 237280901aeaSGeorge Wilson * characteristics (i.e. same checksum, compression algorithms, etc). 237380901aeaSGeorge Wilson * If they don't then just continue with the pipeline which will 237480901aeaSGeorge Wilson * allocate a new bp. 237580901aeaSGeorge Wilson */ 237680901aeaSGeorge Wilson if (BP_IS_HOLE(bp_orig) || 237745818ee1SMatthew Ahrens !(zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_flags & 237845818ee1SMatthew Ahrens ZCHECKSUM_FLAG_NOPWRITE) || 237980901aeaSGeorge Wilson BP_GET_CHECKSUM(bp) != BP_GET_CHECKSUM(bp_orig) || 238080901aeaSGeorge Wilson BP_GET_COMPRESS(bp) != BP_GET_COMPRESS(bp_orig) || 238180901aeaSGeorge Wilson BP_GET_DEDUP(bp) != BP_GET_DEDUP(bp_orig) || 238280901aeaSGeorge Wilson zp->zp_copies != BP_GET_NDVAS(bp_orig)) 238380901aeaSGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 238480901aeaSGeorge Wilson 238580901aeaSGeorge Wilson /* 238680901aeaSGeorge Wilson * If the checksums match then reset the pipeline so that we 238780901aeaSGeorge Wilson * avoid allocating a new bp and issuing any I/O. 238880901aeaSGeorge Wilson */ 238980901aeaSGeorge Wilson if (ZIO_CHECKSUM_EQUAL(bp->blk_cksum, bp_orig->blk_cksum)) { 239045818ee1SMatthew Ahrens ASSERT(zio_checksum_table[zp->zp_checksum].ci_flags & 239145818ee1SMatthew Ahrens ZCHECKSUM_FLAG_NOPWRITE); 239280901aeaSGeorge Wilson ASSERT3U(BP_GET_PSIZE(bp), ==, BP_GET_PSIZE(bp_orig)); 239380901aeaSGeorge Wilson ASSERT3U(BP_GET_LSIZE(bp), ==, BP_GET_LSIZE(bp_orig)); 239480901aeaSGeorge Wilson ASSERT(zp->zp_compress != ZIO_COMPRESS_OFF); 239580901aeaSGeorge Wilson ASSERT(bcmp(&bp->blk_prop, &bp_orig->blk_prop, 239680901aeaSGeorge Wilson sizeof (uint64_t)) == 0); 239780901aeaSGeorge Wilson 239880901aeaSGeorge Wilson *bp = *bp_orig; 239980901aeaSGeorge Wilson zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 240080901aeaSGeorge Wilson zio->io_flags |= ZIO_FLAG_NOPWRITE; 240180901aeaSGeorge Wilson } 240280901aeaSGeorge Wilson 240380901aeaSGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 240480901aeaSGeorge Wilson } 240580901aeaSGeorge Wilson 2406fa9e4066Sahrens /* 2407fa9e4066Sahrens * ========================================================================== 2408b24ab676SJeff Bonwick * Dedup 2409fa9e4066Sahrens * ========================================================================== 2410fa9e4066Sahrens */ 2411b24ab676SJeff Bonwick static void 2412b24ab676SJeff Bonwick zio_ddt_child_read_done(zio_t *zio) 2413b24ab676SJeff Bonwick { 2414b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2415b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2416b24ab676SJeff Bonwick ddt_phys_t *ddp; 2417b24ab676SJeff Bonwick zio_t *pio = zio_unique_parent(zio); 2418b24ab676SJeff Bonwick 2419b24ab676SJeff Bonwick mutex_enter(&pio->io_lock); 2420b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 2421b24ab676SJeff Bonwick if (zio->io_error == 0) 2422b24ab676SJeff Bonwick ddt_phys_clear(ddp); /* this ddp doesn't need repair */ 2423770499e1SDan Kimmel 2424770499e1SDan Kimmel if (zio->io_error == 0 && dde->dde_repair_abd == NULL) 2425770499e1SDan Kimmel dde->dde_repair_abd = zio->io_abd; 2426b24ab676SJeff Bonwick else 2427770499e1SDan Kimmel abd_free(zio->io_abd); 2428b24ab676SJeff Bonwick mutex_exit(&pio->io_lock); 2429b24ab676SJeff Bonwick } 2430b24ab676SJeff Bonwick 2431b24ab676SJeff Bonwick static int 2432b24ab676SJeff Bonwick zio_ddt_read_start(zio_t *zio) 2433b24ab676SJeff Bonwick { 2434b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2435b24ab676SJeff Bonwick 2436b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2437b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 2438b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2439b24ab676SJeff Bonwick 2440b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 2441b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 2442b24ab676SJeff Bonwick ddt_entry_t *dde = ddt_repair_start(ddt, bp); 2443b24ab676SJeff Bonwick ddt_phys_t *ddp = dde->dde_phys; 2444b24ab676SJeff Bonwick ddt_phys_t *ddp_self = ddt_phys_select(dde, bp); 2445b24ab676SJeff Bonwick blkptr_t blk; 2446b24ab676SJeff Bonwick 2447b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 2448b24ab676SJeff Bonwick zio->io_vsd = dde; 2449b24ab676SJeff Bonwick 2450b24ab676SJeff Bonwick if (ddp_self == NULL) 2451b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2452b24ab676SJeff Bonwick 2453b24ab676SJeff Bonwick for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { 2454b24ab676SJeff Bonwick if (ddp->ddp_phys_birth == 0 || ddp == ddp_self) 2455b24ab676SJeff Bonwick continue; 2456bbfd46c4SJeff Bonwick ddt_bp_create(ddt->ddt_checksum, &dde->dde_key, ddp, 2457bbfd46c4SJeff Bonwick &blk); 2458b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, &blk, 2459770499e1SDan Kimmel abd_alloc_for_io(zio->io_size, B_TRUE), 2460770499e1SDan Kimmel zio->io_size, zio_ddt_child_read_done, dde, 2461770499e1SDan Kimmel zio->io_priority, ZIO_DDT_CHILD_FLAGS(zio) | 2462770499e1SDan Kimmel ZIO_FLAG_DONT_PROPAGATE, &zio->io_bookmark)); 2463b24ab676SJeff Bonwick } 2464b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2465b24ab676SJeff Bonwick } 2466b24ab676SJeff Bonwick 2467b24ab676SJeff Bonwick zio_nowait(zio_read(zio, zio->io_spa, bp, 2468770499e1SDan Kimmel zio->io_abd, zio->io_size, NULL, NULL, zio->io_priority, 2469b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark)); 2470b24ab676SJeff Bonwick 2471b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2472b24ab676SJeff Bonwick } 2473e14bb325SJeff Bonwick 2474b24ab676SJeff Bonwick static int 2475b24ab676SJeff Bonwick zio_ddt_read_done(zio_t *zio) 2476b24ab676SJeff Bonwick { 2477b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2478b24ab676SJeff Bonwick 2479d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_DDT_BIT, ZIO_WAIT_DONE)) { 2480b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 2481d6e1c446SGeorge Wilson } 2482b24ab676SJeff Bonwick 2483b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2484b24ab676SJeff Bonwick ASSERT(BP_GET_PSIZE(bp) == zio->io_size); 2485b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2486b24ab676SJeff Bonwick 2487b24ab676SJeff Bonwick if (zio->io_child_error[ZIO_CHILD_DDT]) { 2488b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 2489b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_vsd; 2490b24ab676SJeff Bonwick if (ddt == NULL) { 2491b16da2e2SGeorge Wilson ASSERT(spa_load_state(zio->io_spa) != SPA_LOAD_NONE); 2492b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2493b24ab676SJeff Bonwick } 2494b24ab676SJeff Bonwick if (dde == NULL) { 2495b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_DDT_READ_START >> 1; 249635a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_FALSE); 2497b24ab676SJeff Bonwick return (ZIO_PIPELINE_STOP); 2498b24ab676SJeff Bonwick } 2499770499e1SDan Kimmel if (dde->dde_repair_abd != NULL) { 2500770499e1SDan Kimmel abd_copy(zio->io_abd, dde->dde_repair_abd, 2501770499e1SDan Kimmel zio->io_size); 2502b24ab676SJeff Bonwick zio->io_child_error[ZIO_CHILD_DDT] = 0; 2503b24ab676SJeff Bonwick } 2504b24ab676SJeff Bonwick ddt_repair_done(ddt, dde); 2505b24ab676SJeff Bonwick zio->io_vsd = NULL; 2506b24ab676SJeff Bonwick } 2507b24ab676SJeff Bonwick 2508b24ab676SJeff Bonwick ASSERT(zio->io_vsd == NULL); 2509b24ab676SJeff Bonwick 2510b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2511b24ab676SJeff Bonwick } 2512b24ab676SJeff Bonwick 2513b24ab676SJeff Bonwick static boolean_t 2514b24ab676SJeff Bonwick zio_ddt_collision(zio_t *zio, ddt_t *ddt, ddt_entry_t *dde) 2515b24ab676SJeff Bonwick { 2516b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 25175602294fSDan Kimmel boolean_t do_raw = (zio->io_flags & ZIO_FLAG_RAW); 25185602294fSDan Kimmel 25195602294fSDan Kimmel /* We should never get a raw, override zio */ 25205602294fSDan Kimmel ASSERT(!(zio->io_bp_override && do_raw)); 2521b24ab676SJeff Bonwick 2522b24ab676SJeff Bonwick /* 2523b24ab676SJeff Bonwick * Note: we compare the original data, not the transformed data, 2524b24ab676SJeff Bonwick * because when zio->io_bp is an override bp, we will not have 2525b24ab676SJeff Bonwick * pushed the I/O transforms. That's an important optimization 2526b24ab676SJeff Bonwick * because otherwise we'd compress/encrypt all dmu_sync() data twice. 2527b24ab676SJeff Bonwick */ 2528b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 2529b24ab676SJeff Bonwick zio_t *lio = dde->dde_lead_zio[p]; 2530b24ab676SJeff Bonwick 2531b24ab676SJeff Bonwick if (lio != NULL) { 2532b24ab676SJeff Bonwick return (lio->io_orig_size != zio->io_orig_size || 2533770499e1SDan Kimmel abd_cmp(zio->io_orig_abd, lio->io_orig_abd, 2534b24ab676SJeff Bonwick zio->io_orig_size) != 0); 2535b24ab676SJeff Bonwick } 2536b24ab676SJeff Bonwick } 2537b24ab676SJeff Bonwick 2538b24ab676SJeff Bonwick for (int p = DDT_PHYS_SINGLE; p <= DDT_PHYS_TRIPLE; p++) { 2539b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2540b24ab676SJeff Bonwick 2541b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) { 2542b24ab676SJeff Bonwick arc_buf_t *abuf = NULL; 25437adb730bSGeorge Wilson arc_flags_t aflags = ARC_FLAG_WAIT; 25445602294fSDan Kimmel int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE; 2545b24ab676SJeff Bonwick blkptr_t blk = *zio->io_bp; 2546b24ab676SJeff Bonwick int error; 2547b24ab676SJeff Bonwick 2548b24ab676SJeff Bonwick ddt_bp_fill(ddp, &blk, ddp->ddp_phys_birth); 2549b24ab676SJeff Bonwick 2550b24ab676SJeff Bonwick ddt_exit(ddt); 2551b24ab676SJeff Bonwick 25525602294fSDan Kimmel /* 25535602294fSDan Kimmel * Intuitively, it would make more sense to compare 2554770499e1SDan Kimmel * io_abd than io_orig_abd in the raw case since you 25555602294fSDan Kimmel * don't want to look at any transformations that have 25565602294fSDan Kimmel * happened to the data. However, for raw I/Os the 2557770499e1SDan Kimmel * data will actually be the same in io_abd and 2558770499e1SDan Kimmel * io_orig_abd, so all we have to do is issue this as 25595602294fSDan Kimmel * a raw ARC read. 25605602294fSDan Kimmel */ 25615602294fSDan Kimmel if (do_raw) { 25625602294fSDan Kimmel zio_flags |= ZIO_FLAG_RAW; 25635602294fSDan Kimmel ASSERT3U(zio->io_size, ==, zio->io_orig_size); 2564770499e1SDan Kimmel ASSERT0(abd_cmp(zio->io_abd, zio->io_orig_abd, 25655602294fSDan Kimmel zio->io_size)); 25665602294fSDan Kimmel ASSERT3P(zio->io_transform_stack, ==, NULL); 25675602294fSDan Kimmel } 25685602294fSDan Kimmel 25691b912ec7SGeorge Wilson error = arc_read(NULL, spa, &blk, 2570b24ab676SJeff Bonwick arc_getbuf_func, &abuf, ZIO_PRIORITY_SYNC_READ, 25715602294fSDan Kimmel zio_flags, &aflags, &zio->io_bookmark); 2572b24ab676SJeff Bonwick 2573b24ab676SJeff Bonwick if (error == 0) { 2574b24ab676SJeff Bonwick if (arc_buf_size(abuf) != zio->io_orig_size || 2575770499e1SDan Kimmel abd_cmp_buf(zio->io_orig_abd, abuf->b_data, 2576b24ab676SJeff Bonwick zio->io_orig_size) != 0) 2577be6fd75aSMatthew Ahrens error = SET_ERROR(EEXIST); 2578dcbf3bd6SGeorge Wilson arc_buf_destroy(abuf, &abuf); 2579b24ab676SJeff Bonwick } 2580b24ab676SJeff Bonwick 2581b24ab676SJeff Bonwick ddt_enter(ddt); 2582b24ab676SJeff Bonwick return (error != 0); 2583b24ab676SJeff Bonwick } 2584b24ab676SJeff Bonwick } 2585b24ab676SJeff Bonwick 2586b24ab676SJeff Bonwick return (B_FALSE); 2587b24ab676SJeff Bonwick } 2588b24ab676SJeff Bonwick 2589b24ab676SJeff Bonwick static void 2590b24ab676SJeff Bonwick zio_ddt_child_write_ready(zio_t *zio) 2591b24ab676SJeff Bonwick { 2592b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 2593b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 2594b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2595b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2596b24ab676SJeff Bonwick zio_t *pio; 2597b24ab676SJeff Bonwick 2598b24ab676SJeff Bonwick if (zio->io_error) 2599b24ab676SJeff Bonwick return; 2600b24ab676SJeff Bonwick 2601b24ab676SJeff Bonwick ddt_enter(ddt); 2602b24ab676SJeff Bonwick 2603b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2604b24ab676SJeff Bonwick 2605b24ab676SJeff Bonwick ddt_phys_fill(ddp, zio->io_bp); 2606b24ab676SJeff Bonwick 26070f7643c7SGeorge Wilson zio_link_t *zl = NULL; 26080f7643c7SGeorge Wilson while ((pio = zio_walk_parents(zio, &zl)) != NULL) 2609b24ab676SJeff Bonwick ddt_bp_fill(ddp, pio->io_bp, zio->io_txg); 2610b24ab676SJeff Bonwick 2611b24ab676SJeff Bonwick ddt_exit(ddt); 2612b24ab676SJeff Bonwick } 2613b24ab676SJeff Bonwick 2614b24ab676SJeff Bonwick static void 2615b24ab676SJeff Bonwick zio_ddt_child_write_done(zio_t *zio) 2616b24ab676SJeff Bonwick { 2617b24ab676SJeff Bonwick int p = zio->io_prop.zp_copies; 2618b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, zio->io_bp); 2619b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2620b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2621b24ab676SJeff Bonwick 2622b24ab676SJeff Bonwick ddt_enter(ddt); 2623b24ab676SJeff Bonwick 2624b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 2625b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2626b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 2627b24ab676SJeff Bonwick 2628b24ab676SJeff Bonwick if (zio->io_error == 0) { 26290f7643c7SGeorge Wilson zio_link_t *zl = NULL; 26300f7643c7SGeorge Wilson while (zio_walk_parents(zio, &zl) != NULL) 2631b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2632b24ab676SJeff Bonwick } else { 2633b24ab676SJeff Bonwick ddt_phys_clear(ddp); 2634b24ab676SJeff Bonwick } 2635b24ab676SJeff Bonwick 2636b24ab676SJeff Bonwick ddt_exit(ddt); 2637b24ab676SJeff Bonwick } 2638b24ab676SJeff Bonwick 2639b24ab676SJeff Bonwick static void 2640b24ab676SJeff Bonwick zio_ddt_ditto_write_done(zio_t *zio) 2641b24ab676SJeff Bonwick { 2642b24ab676SJeff Bonwick int p = DDT_PHYS_DITTO; 2643b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 2644b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2645b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(zio->io_spa, bp); 2646b24ab676SJeff Bonwick ddt_entry_t *dde = zio->io_private; 2647b24ab676SJeff Bonwick ddt_phys_t *ddp = &dde->dde_phys[p]; 2648b24ab676SJeff Bonwick ddt_key_t *ddk = &dde->dde_key; 2649b24ab676SJeff Bonwick 2650b24ab676SJeff Bonwick ddt_enter(ddt); 2651b24ab676SJeff Bonwick 2652b24ab676SJeff Bonwick ASSERT(ddp->ddp_refcnt == 0); 2653b24ab676SJeff Bonwick ASSERT(dde->dde_lead_zio[p] == zio); 2654b24ab676SJeff Bonwick dde->dde_lead_zio[p] = NULL; 2655b24ab676SJeff Bonwick 2656b24ab676SJeff Bonwick if (zio->io_error == 0) { 2657b24ab676SJeff Bonwick ASSERT(ZIO_CHECKSUM_EQUAL(bp->blk_cksum, ddk->ddk_cksum)); 2658b24ab676SJeff Bonwick ASSERT(zp->zp_copies < SPA_DVAS_PER_BP); 2659b24ab676SJeff Bonwick ASSERT(zp->zp_copies == BP_GET_NDVAS(bp) - BP_IS_GANG(bp)); 2660b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2661b24ab676SJeff Bonwick ddt_phys_free(ddt, ddk, ddp, zio->io_txg); 2662b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2663b24ab676SJeff Bonwick } 2664b24ab676SJeff Bonwick 2665b24ab676SJeff Bonwick ddt_exit(ddt); 2666b24ab676SJeff Bonwick } 2667b24ab676SJeff Bonwick 2668b24ab676SJeff Bonwick static int 2669b24ab676SJeff Bonwick zio_ddt_write(zio_t *zio) 2670b24ab676SJeff Bonwick { 2671b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2672b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2673b24ab676SJeff Bonwick uint64_t txg = zio->io_txg; 2674b24ab676SJeff Bonwick zio_prop_t *zp = &zio->io_prop; 2675b24ab676SJeff Bonwick int p = zp->zp_copies; 2676b24ab676SJeff Bonwick int ditto_copies; 2677b24ab676SJeff Bonwick zio_t *cio = NULL; 2678b24ab676SJeff Bonwick zio_t *dio = NULL; 2679b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2680b24ab676SJeff Bonwick ddt_entry_t *dde; 2681b24ab676SJeff Bonwick ddt_phys_t *ddp; 2682b24ab676SJeff Bonwick 2683b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2684b24ab676SJeff Bonwick ASSERT(BP_GET_CHECKSUM(bp) == zp->zp_checksum); 2685b24ab676SJeff Bonwick ASSERT(BP_IS_HOLE(bp) || zio->io_bp_override); 26865602294fSDan Kimmel ASSERT(!(zio->io_bp_override && (zio->io_flags & ZIO_FLAG_RAW))); 2687b24ab676SJeff Bonwick 2688b24ab676SJeff Bonwick ddt_enter(ddt); 2689b24ab676SJeff Bonwick dde = ddt_lookup(ddt, bp, B_TRUE); 2690b24ab676SJeff Bonwick ddp = &dde->dde_phys[p]; 2691b24ab676SJeff Bonwick 2692b24ab676SJeff Bonwick if (zp->zp_dedup_verify && zio_ddt_collision(zio, ddt, dde)) { 2693b24ab676SJeff Bonwick /* 2694b24ab676SJeff Bonwick * If we're using a weak checksum, upgrade to a strong checksum 2695b24ab676SJeff Bonwick * and try again. If we're already using a strong checksum, 2696b24ab676SJeff Bonwick * we can't resolve it, so just convert to an ordinary write. 2697b24ab676SJeff Bonwick * (And automatically e-mail a paper to Nature?) 2698b24ab676SJeff Bonwick */ 269945818ee1SMatthew Ahrens if (!(zio_checksum_table[zp->zp_checksum].ci_flags & 270045818ee1SMatthew Ahrens ZCHECKSUM_FLAG_DEDUP)) { 2701b24ab676SJeff Bonwick zp->zp_checksum = spa_dedup_checksum(spa); 2702b24ab676SJeff Bonwick zio_pop_transforms(zio); 2703b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2704b24ab676SJeff Bonwick BP_ZERO(bp); 2705b24ab676SJeff Bonwick } else { 270680901aeaSGeorge Wilson zp->zp_dedup = B_FALSE; 27075602294fSDan Kimmel BP_SET_DEDUP(bp, B_FALSE); 2708b24ab676SJeff Bonwick } 27095602294fSDan Kimmel ASSERT(!BP_GET_DEDUP(bp)); 2710b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2711b24ab676SJeff Bonwick ddt_exit(ddt); 2712b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2713b24ab676SJeff Bonwick } 2714b24ab676SJeff Bonwick 2715b24ab676SJeff Bonwick ditto_copies = ddt_ditto_copies_needed(ddt, dde, ddp); 2716b24ab676SJeff Bonwick ASSERT(ditto_copies < SPA_DVAS_PER_BP); 2717b24ab676SJeff Bonwick 2718b24ab676SJeff Bonwick if (ditto_copies > ddt_ditto_copies_present(dde) && 2719b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] == NULL) { 2720b24ab676SJeff Bonwick zio_prop_t czp = *zp; 2721b24ab676SJeff Bonwick 2722b24ab676SJeff Bonwick czp.zp_copies = ditto_copies; 2723b24ab676SJeff Bonwick 2724b24ab676SJeff Bonwick /* 2725b24ab676SJeff Bonwick * If we arrived here with an override bp, we won't have run 2726b24ab676SJeff Bonwick * the transform stack, so we won't have the data we need to 2727b24ab676SJeff Bonwick * generate a child i/o. So, toss the override bp and restart. 2728b24ab676SJeff Bonwick * This is safe, because using the override bp is just an 2729b24ab676SJeff Bonwick * optimization; and it's rare, so the cost doesn't matter. 2730b24ab676SJeff Bonwick */ 2731b24ab676SJeff Bonwick if (zio->io_bp_override) { 2732b24ab676SJeff Bonwick zio_pop_transforms(zio); 2733b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_OPEN; 2734b24ab676SJeff Bonwick zio->io_pipeline = ZIO_WRITE_PIPELINE; 2735b24ab676SJeff Bonwick zio->io_bp_override = NULL; 2736b24ab676SJeff Bonwick BP_ZERO(bp); 2737b24ab676SJeff Bonwick ddt_exit(ddt); 2738b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2739b24ab676SJeff Bonwick } 2740b24ab676SJeff Bonwick 2741770499e1SDan Kimmel dio = zio_write(zio, spa, txg, bp, zio->io_orig_abd, 27425602294fSDan Kimmel zio->io_orig_size, zio->io_orig_size, &czp, NULL, NULL, 27438df0bcf0SPaul Dagnelie NULL, zio_ddt_ditto_write_done, dde, zio->io_priority, 2744b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2745b24ab676SJeff Bonwick 2746770499e1SDan Kimmel zio_push_transform(dio, zio->io_abd, zio->io_size, 0, NULL); 2747b24ab676SJeff Bonwick dde->dde_lead_zio[DDT_PHYS_DITTO] = dio; 2748b24ab676SJeff Bonwick } 2749b24ab676SJeff Bonwick 2750b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0 || dde->dde_lead_zio[p] != NULL) { 2751b24ab676SJeff Bonwick if (ddp->ddp_phys_birth != 0) 2752b24ab676SJeff Bonwick ddt_bp_fill(ddp, bp, txg); 2753b24ab676SJeff Bonwick if (dde->dde_lead_zio[p] != NULL) 2754b24ab676SJeff Bonwick zio_add_child(zio, dde->dde_lead_zio[p]); 2755b24ab676SJeff Bonwick else 2756b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2757b24ab676SJeff Bonwick } else if (zio->io_bp_override) { 2758b24ab676SJeff Bonwick ASSERT(bp->blk_birth == txg); 2759b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, zio->io_bp_override)); 2760b24ab676SJeff Bonwick ddt_phys_fill(ddp, bp); 2761b24ab676SJeff Bonwick ddt_phys_addref(ddp); 2762b24ab676SJeff Bonwick } else { 2763770499e1SDan Kimmel cio = zio_write(zio, spa, txg, bp, zio->io_orig_abd, 27645602294fSDan Kimmel zio->io_orig_size, zio->io_orig_size, zp, 27658df0bcf0SPaul Dagnelie zio_ddt_child_write_ready, NULL, NULL, 2766b24ab676SJeff Bonwick zio_ddt_child_write_done, dde, zio->io_priority, 2767b24ab676SJeff Bonwick ZIO_DDT_CHILD_FLAGS(zio), &zio->io_bookmark); 2768b24ab676SJeff Bonwick 2769770499e1SDan Kimmel zio_push_transform(cio, zio->io_abd, zio->io_size, 0, NULL); 2770b24ab676SJeff Bonwick dde->dde_lead_zio[p] = cio; 2771b24ab676SJeff Bonwick } 2772b24ab676SJeff Bonwick 2773b24ab676SJeff Bonwick ddt_exit(ddt); 2774b24ab676SJeff Bonwick 2775b24ab676SJeff Bonwick if (cio) 2776b24ab676SJeff Bonwick zio_nowait(cio); 2777b24ab676SJeff Bonwick if (dio) 2778b24ab676SJeff Bonwick zio_nowait(dio); 2779b24ab676SJeff Bonwick 2780b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2781b24ab676SJeff Bonwick } 2782b24ab676SJeff Bonwick 27833f9d6ad7SLin Ling ddt_entry_t *freedde; /* for debugging */ 27843f9d6ad7SLin Ling 2785b24ab676SJeff Bonwick static int 2786b24ab676SJeff Bonwick zio_ddt_free(zio_t *zio) 2787b24ab676SJeff Bonwick { 2788b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2789b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2790b24ab676SJeff Bonwick ddt_t *ddt = ddt_select(spa, bp); 2791b24ab676SJeff Bonwick ddt_entry_t *dde; 2792b24ab676SJeff Bonwick ddt_phys_t *ddp; 2793b24ab676SJeff Bonwick 2794b24ab676SJeff Bonwick ASSERT(BP_GET_DEDUP(bp)); 2795b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 2796b24ab676SJeff Bonwick 2797b24ab676SJeff Bonwick ddt_enter(ddt); 27983f9d6ad7SLin Ling freedde = dde = ddt_lookup(ddt, bp, B_TRUE); 2799b24ab676SJeff Bonwick ddp = ddt_phys_select(dde, bp); 2800b24ab676SJeff Bonwick ddt_phys_decref(ddp); 2801b24ab676SJeff Bonwick ddt_exit(ddt); 2802b24ab676SJeff Bonwick 2803b24ab676SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 2804b24ab676SJeff Bonwick } 2805b24ab676SJeff Bonwick 2806b24ab676SJeff Bonwick /* 2807b24ab676SJeff Bonwick * ========================================================================== 2808b24ab676SJeff Bonwick * Allocate and free blocks 2809b24ab676SJeff Bonwick * ========================================================================== 2810b24ab676SJeff Bonwick */ 28110f7643c7SGeorge Wilson 28120f7643c7SGeorge Wilson static zio_t * 2813*f78cdc34SPaul Dagnelie zio_io_to_allocate(spa_t *spa, int allocator) 28140f7643c7SGeorge Wilson { 28150f7643c7SGeorge Wilson zio_t *zio; 28160f7643c7SGeorge Wilson 2817*f78cdc34SPaul Dagnelie ASSERT(MUTEX_HELD(&spa->spa_alloc_locks[allocator])); 28180f7643c7SGeorge Wilson 2819*f78cdc34SPaul Dagnelie zio = avl_first(&spa->spa_alloc_trees[allocator]); 28200f7643c7SGeorge Wilson if (zio == NULL) 28210f7643c7SGeorge Wilson return (NULL); 28220f7643c7SGeorge Wilson 28230f7643c7SGeorge Wilson ASSERT(IO_IS_ALLOCATING(zio)); 28240f7643c7SGeorge Wilson 28250f7643c7SGeorge Wilson /* 28260f7643c7SGeorge Wilson * Try to place a reservation for this zio. If we're unable to 28270f7643c7SGeorge Wilson * reserve then we throttle. 28280f7643c7SGeorge Wilson */ 2829*f78cdc34SPaul Dagnelie ASSERT3U(zio->io_allocator, ==, allocator); 28300f7643c7SGeorge Wilson if (!metaslab_class_throttle_reserve(spa_normal_class(spa), 2831*f78cdc34SPaul Dagnelie zio->io_prop.zp_copies, zio->io_allocator, zio, 0)) { 28320f7643c7SGeorge Wilson return (NULL); 28330f7643c7SGeorge Wilson } 28340f7643c7SGeorge Wilson 2835*f78cdc34SPaul Dagnelie avl_remove(&spa->spa_alloc_trees[allocator], zio); 28360f7643c7SGeorge Wilson ASSERT3U(zio->io_stage, <, ZIO_STAGE_DVA_ALLOCATE); 28370f7643c7SGeorge Wilson 28380f7643c7SGeorge Wilson return (zio); 28390f7643c7SGeorge Wilson } 28400f7643c7SGeorge Wilson 28410f7643c7SGeorge Wilson static int 28420f7643c7SGeorge Wilson zio_dva_throttle(zio_t *zio) 28430f7643c7SGeorge Wilson { 28440f7643c7SGeorge Wilson spa_t *spa = zio->io_spa; 28450f7643c7SGeorge Wilson zio_t *nio; 28460f7643c7SGeorge Wilson 28470f7643c7SGeorge Wilson if (zio->io_priority == ZIO_PRIORITY_SYNC_WRITE || 28480f7643c7SGeorge Wilson !spa_normal_class(zio->io_spa)->mc_alloc_throttle_enabled || 28490f7643c7SGeorge Wilson zio->io_child_type == ZIO_CHILD_GANG || 28500f7643c7SGeorge Wilson zio->io_flags & ZIO_FLAG_NODATA) { 28510f7643c7SGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 28520f7643c7SGeorge Wilson } 28530f7643c7SGeorge Wilson 28540f7643c7SGeorge Wilson ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 28550f7643c7SGeorge Wilson 28560f7643c7SGeorge Wilson ASSERT3U(zio->io_queued_timestamp, >, 0); 28570f7643c7SGeorge Wilson ASSERT(zio->io_stage == ZIO_STAGE_DVA_THROTTLE); 28580f7643c7SGeorge Wilson 2859*f78cdc34SPaul Dagnelie zbookmark_phys_t *bm = &zio->io_bookmark; 2860*f78cdc34SPaul Dagnelie /* 2861*f78cdc34SPaul Dagnelie * We want to try to use as many allocators as possible to help improve 2862*f78cdc34SPaul Dagnelie * performance, but we also want logically adjacent IOs to be physically 2863*f78cdc34SPaul Dagnelie * adjacent to improve sequential read performance. We chunk each object 2864*f78cdc34SPaul Dagnelie * into 2^20 block regions, and then hash based on the objset, object, 2865*f78cdc34SPaul Dagnelie * level, and region to accomplish both of these goals. 2866*f78cdc34SPaul Dagnelie */ 2867*f78cdc34SPaul Dagnelie zio->io_allocator = cityhash4(bm->zb_objset, bm->zb_object, 2868*f78cdc34SPaul Dagnelie bm->zb_level, bm->zb_blkid >> 20) % spa->spa_alloc_count; 2869*f78cdc34SPaul Dagnelie mutex_enter(&spa->spa_alloc_locks[zio->io_allocator]); 28700f7643c7SGeorge Wilson 28710f7643c7SGeorge Wilson ASSERT(zio->io_type == ZIO_TYPE_WRITE); 2872*f78cdc34SPaul Dagnelie avl_add(&spa->spa_alloc_trees[zio->io_allocator], zio); 28730f7643c7SGeorge Wilson 2874*f78cdc34SPaul Dagnelie nio = zio_io_to_allocate(zio->io_spa, zio->io_allocator); 2875*f78cdc34SPaul Dagnelie mutex_exit(&spa->spa_alloc_locks[zio->io_allocator]); 28760f7643c7SGeorge Wilson 28770f7643c7SGeorge Wilson if (nio == zio) 28780f7643c7SGeorge Wilson return (ZIO_PIPELINE_CONTINUE); 28790f7643c7SGeorge Wilson 28800f7643c7SGeorge Wilson if (nio != NULL) { 28810f7643c7SGeorge Wilson ASSERT(nio->io_stage == ZIO_STAGE_DVA_THROTTLE); 28820f7643c7SGeorge Wilson /* 28830f7643c7SGeorge Wilson * We are passing control to a new zio so make sure that 28840f7643c7SGeorge Wilson * it is processed by a different thread. We do this to 28850f7643c7SGeorge Wilson * avoid stack overflows that can occur when parents are 28860f7643c7SGeorge Wilson * throttled and children are making progress. We allow 28870f7643c7SGeorge Wilson * it to go to the head of the taskq since it's already 28880f7643c7SGeorge Wilson * been waiting. 28890f7643c7SGeorge Wilson */ 28900f7643c7SGeorge Wilson zio_taskq_dispatch(nio, ZIO_TASKQ_ISSUE, B_TRUE); 28910f7643c7SGeorge Wilson } 28920f7643c7SGeorge Wilson return (ZIO_PIPELINE_STOP); 28930f7643c7SGeorge Wilson } 28940f7643c7SGeorge Wilson 28950f7643c7SGeorge Wilson void 2896*f78cdc34SPaul Dagnelie zio_allocate_dispatch(spa_t *spa, int allocator) 28970f7643c7SGeorge Wilson { 28980f7643c7SGeorge Wilson zio_t *zio; 28990f7643c7SGeorge Wilson 2900*f78cdc34SPaul Dagnelie mutex_enter(&spa->spa_alloc_locks[allocator]); 2901*f78cdc34SPaul Dagnelie zio = zio_io_to_allocate(spa, allocator); 2902*f78cdc34SPaul Dagnelie mutex_exit(&spa->spa_alloc_locks[allocator]); 29030f7643c7SGeorge Wilson if (zio == NULL) 29040f7643c7SGeorge Wilson return; 29050f7643c7SGeorge Wilson 29060f7643c7SGeorge Wilson ASSERT3U(zio->io_stage, ==, ZIO_STAGE_DVA_THROTTLE); 29070f7643c7SGeorge Wilson ASSERT0(zio->io_error); 29080f7643c7SGeorge Wilson zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, B_TRUE); 29090f7643c7SGeorge Wilson } 29100f7643c7SGeorge Wilson 2911e05725b1Sbonwick static int 2912fa9e4066Sahrens zio_dva_allocate(zio_t *zio) 2913fa9e4066Sahrens { 29148654d025Sperrin spa_t *spa = zio->io_spa; 2915b24ab676SJeff Bonwick metaslab_class_t *mc = spa_normal_class(spa); 2916fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 2917fa9e4066Sahrens int error; 291809c9d376SGeorge Wilson int flags = 0; 2919fa9e4066Sahrens 2920f5383399SBill Moore if (zio->io_gang_leader == NULL) { 2921f5383399SBill Moore ASSERT(zio->io_child_type > ZIO_CHILD_GANG); 2922f5383399SBill Moore zio->io_gang_leader = zio; 2923f5383399SBill Moore } 2924f5383399SBill Moore 2925fa9e4066Sahrens ASSERT(BP_IS_HOLE(bp)); 2926fb09f5aaSMadhav Suresh ASSERT0(BP_GET_NDVAS(bp)); 2927b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, >, 0); 2928b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, spa_max_replication(spa)); 2929fa9e4066Sahrens ASSERT3U(zio->io_size, ==, BP_GET_PSIZE(bp)); 2930fa9e4066Sahrens 29310f7643c7SGeorge Wilson if (zio->io_flags & ZIO_FLAG_NODATA) { 29320f7643c7SGeorge Wilson flags |= METASLAB_DONT_THROTTLE; 29330f7643c7SGeorge Wilson } 29340f7643c7SGeorge Wilson if (zio->io_flags & ZIO_FLAG_GANG_CHILD) { 29350f7643c7SGeorge Wilson flags |= METASLAB_GANG_CHILD; 29360f7643c7SGeorge Wilson } 29370f7643c7SGeorge Wilson if (zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE) { 29380f7643c7SGeorge Wilson flags |= METASLAB_ASYNC_ALLOC; 29390f7643c7SGeorge Wilson } 29400f7643c7SGeorge Wilson 2941e14bb325SJeff Bonwick error = metaslab_alloc(spa, mc, zio->io_size, bp, 29428363e80aSGeorge Wilson zio->io_prop.zp_copies, zio->io_txg, NULL, flags, 2943*f78cdc34SPaul Dagnelie &zio->io_alloc_list, zio, zio->io_allocator); 2944fa9e4066Sahrens 29450f7643c7SGeorge Wilson if (error != 0) { 294609c9d376SGeorge Wilson spa_dbgmsg(spa, "%s: metaslab allocation failure: zio %p, " 294709c9d376SGeorge Wilson "size %llu, error %d", spa_name(spa), zio, zio->io_size, 294809c9d376SGeorge Wilson error); 2949e14bb325SJeff Bonwick if (error == ENOSPC && zio->io_size > SPA_MINBLOCKSIZE) 2950e14bb325SJeff Bonwick return (zio_write_gang_block(zio)); 2951fa9e4066Sahrens zio->io_error = error; 2952fa9e4066Sahrens } 2953e05725b1Sbonwick 2954e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2955fa9e4066Sahrens } 2956fa9e4066Sahrens 2957e05725b1Sbonwick static int 2958fa9e4066Sahrens zio_dva_free(zio_t *zio) 2959fa9e4066Sahrens { 2960e14bb325SJeff Bonwick metaslab_free(zio->io_spa, zio->io_bp, zio->io_txg, B_FALSE); 2961fa9e4066Sahrens 2962e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2963fa9e4066Sahrens } 2964fa9e4066Sahrens 2965e05725b1Sbonwick static int 2966fa9e4066Sahrens zio_dva_claim(zio_t *zio) 2967fa9e4066Sahrens { 2968e14bb325SJeff Bonwick int error; 2969e14bb325SJeff Bonwick 2970e14bb325SJeff Bonwick error = metaslab_claim(zio->io_spa, zio->io_bp, zio->io_txg); 2971e14bb325SJeff Bonwick if (error) 2972e14bb325SJeff Bonwick zio->io_error = error; 2973fa9e4066Sahrens 2974e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 2975fa9e4066Sahrens } 2976fa9e4066Sahrens 2977e14bb325SJeff Bonwick /* 2978e14bb325SJeff Bonwick * Undo an allocation. This is used by zio_done() when an I/O fails 2979e14bb325SJeff Bonwick * and we want to give back the block we just allocated. 2980e14bb325SJeff Bonwick * This handles both normal blocks and gang blocks. 2981e14bb325SJeff Bonwick */ 2982e14bb325SJeff Bonwick static void 2983e14bb325SJeff Bonwick zio_dva_unallocate(zio_t *zio, zio_gang_node_t *gn, blkptr_t *bp) 2984e14bb325SJeff Bonwick { 2985e14bb325SJeff Bonwick ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp)); 2986b24ab676SJeff Bonwick ASSERT(zio->io_bp_override == NULL); 2987e14bb325SJeff Bonwick 2988e14bb325SJeff Bonwick if (!BP_IS_HOLE(bp)) 2989b24ab676SJeff Bonwick metaslab_free(zio->io_spa, bp, bp->blk_birth, B_TRUE); 2990e14bb325SJeff Bonwick 2991e14bb325SJeff Bonwick if (gn != NULL) { 2992e14bb325SJeff Bonwick for (int g = 0; g < SPA_GBH_NBLKPTRS; g++) { 2993e14bb325SJeff Bonwick zio_dva_unallocate(zio, gn->gn_child[g], 2994e14bb325SJeff Bonwick &gn->gn_gbh->zg_blkptr[g]); 2995e14bb325SJeff Bonwick } 2996e14bb325SJeff Bonwick } 2997e14bb325SJeff Bonwick } 2998e14bb325SJeff Bonwick 2999e14bb325SJeff Bonwick /* 3000e14bb325SJeff Bonwick * Try to allocate an intent log block. Return 0 on success, errno on failure. 3001e14bb325SJeff Bonwick */ 3002e14bb325SJeff Bonwick int 3003*f78cdc34SPaul Dagnelie zio_alloc_zil(spa_t *spa, uint64_t objset, uint64_t txg, blkptr_t *new_bp, 3004*f78cdc34SPaul Dagnelie blkptr_t *old_bp, uint64_t size, boolean_t *slog) 3005e14bb325SJeff Bonwick { 3006e09fa4daSNeil Perrin int error = 1; 30078363e80aSGeorge Wilson zio_alloc_list_t io_alloc_list; 3008e14bb325SJeff Bonwick 3009b24ab676SJeff Bonwick ASSERT(txg > spa_syncing_txg(spa)); 3010b24ab676SJeff Bonwick 30118363e80aSGeorge Wilson metaslab_trace_init(&io_alloc_list); 3012*f78cdc34SPaul Dagnelie /* 3013*f78cdc34SPaul Dagnelie * When allocating a zil block, we don't have information about 3014*f78cdc34SPaul Dagnelie * the final destination of the block except the objset it's part 3015*f78cdc34SPaul Dagnelie * of, so we just hash the objset ID to pick the allocator to get 3016*f78cdc34SPaul Dagnelie * some parallelism. 3017*f78cdc34SPaul Dagnelie */ 3018c5ee4681SAlexander Motin error = metaslab_alloc(spa, spa_log_class(spa), size, new_bp, 1, 3019*f78cdc34SPaul Dagnelie txg, old_bp, METASLAB_HINTBP_AVOID, &io_alloc_list, NULL, 3020*f78cdc34SPaul Dagnelie cityhash4(0, 0, 0, objset) % spa->spa_alloc_count); 3021c5ee4681SAlexander Motin if (error == 0) { 3022c5ee4681SAlexander Motin *slog = TRUE; 3023c5ee4681SAlexander Motin } else { 3024b24ab676SJeff Bonwick error = metaslab_alloc(spa, spa_normal_class(spa), size, 30258363e80aSGeorge Wilson new_bp, 1, txg, old_bp, METASLAB_HINTBP_AVOID, 3026*f78cdc34SPaul Dagnelie &io_alloc_list, NULL, cityhash4(0, 0, 0, objset) % 3027*f78cdc34SPaul Dagnelie spa->spa_alloc_count); 3028c5ee4681SAlexander Motin if (error == 0) 3029c5ee4681SAlexander Motin *slog = FALSE; 3030840345f6SGeorge Wilson } 30318363e80aSGeorge Wilson metaslab_trace_fini(&io_alloc_list); 3032e14bb325SJeff Bonwick 3033e14bb325SJeff Bonwick if (error == 0) { 3034e14bb325SJeff Bonwick BP_SET_LSIZE(new_bp, size); 3035e14bb325SJeff Bonwick BP_SET_PSIZE(new_bp, size); 3036e14bb325SJeff Bonwick BP_SET_COMPRESS(new_bp, ZIO_COMPRESS_OFF); 30376e1f5caaSNeil Perrin BP_SET_CHECKSUM(new_bp, 30386e1f5caaSNeil Perrin spa_version(spa) >= SPA_VERSION_SLIM_ZIL 30396e1f5caaSNeil Perrin ? ZIO_CHECKSUM_ZILOG2 : ZIO_CHECKSUM_ZILOG); 3040e14bb325SJeff Bonwick BP_SET_TYPE(new_bp, DMU_OT_INTENT_LOG); 3041e14bb325SJeff Bonwick BP_SET_LEVEL(new_bp, 0); 3042b24ab676SJeff Bonwick BP_SET_DEDUP(new_bp, 0); 3043e14bb325SJeff Bonwick BP_SET_BYTEORDER(new_bp, ZFS_HOST_BYTEORDER); 30441271e4b1SPrakash Surya } else { 30451271e4b1SPrakash Surya zfs_dbgmsg("%s: zil block allocation failure: " 30461271e4b1SPrakash Surya "size %llu, error %d", spa_name(spa), size, error); 3047e14bb325SJeff Bonwick } 3048e14bb325SJeff Bonwick 3049e14bb325SJeff Bonwick return (error); 3050e14bb325SJeff Bonwick } 3051e14bb325SJeff Bonwick 3052fa9e4066Sahrens /* 3053fa9e4066Sahrens * ========================================================================== 3054fa9e4066Sahrens * Read and write to physical devices 3055fa9e4066Sahrens * ========================================================================== 3056fa9e4066Sahrens */ 3057738f37bcSGeorge Wilson 3058738f37bcSGeorge Wilson 3059738f37bcSGeorge Wilson /* 3060738f37bcSGeorge Wilson * Issue an I/O to the underlying vdev. Typically the issue pipeline 3061738f37bcSGeorge Wilson * stops after this stage and will resume upon I/O completion. 3062738f37bcSGeorge Wilson * However, there are instances where the vdev layer may need to 3063738f37bcSGeorge Wilson * continue the pipeline when an I/O was not issued. Since the I/O 3064738f37bcSGeorge Wilson * that was sent to the vdev layer might be different than the one 3065738f37bcSGeorge Wilson * currently active in the pipeline (see vdev_queue_io()), we explicitly 3066738f37bcSGeorge Wilson * force the underlying vdev layers to call either zio_execute() or 3067738f37bcSGeorge Wilson * zio_interrupt() to ensure that the pipeline continues with the correct I/O. 3068738f37bcSGeorge Wilson */ 3069e05725b1Sbonwick static int 307044cd46caSbillm zio_vdev_io_start(zio_t *zio) 3071fa9e4066Sahrens { 3072fa9e4066Sahrens vdev_t *vd = zio->io_vd; 307344cd46caSbillm uint64_t align; 30740a4e9518Sgw spa_t *spa = zio->io_spa; 30750a4e9518Sgw 3076e14bb325SJeff Bonwick ASSERT(zio->io_error == 0); 3077e14bb325SJeff Bonwick ASSERT(zio->io_child_error[ZIO_CHILD_VDEV] == 0); 3078fa9e4066Sahrens 3079e14bb325SJeff Bonwick if (vd == NULL) { 3080e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 3081e14bb325SJeff Bonwick spa_config_enter(spa, SCL_ZIO, zio, RW_READER); 3082fa9e4066Sahrens 3083e14bb325SJeff Bonwick /* 3084e14bb325SJeff Bonwick * The mirror_ops handle multiple DVAs in a single BP. 3085e14bb325SJeff Bonwick */ 3086738f37bcSGeorge Wilson vdev_mirror_ops.vdev_op_io_start(zio); 3087738f37bcSGeorge Wilson return (ZIO_PIPELINE_STOP); 3088fa9e4066Sahrens } 3089fa9e4066Sahrens 30900f7643c7SGeorge Wilson ASSERT3P(zio->io_logical, !=, zio); 30916f793812SPavel Zakharov if (zio->io_type == ZIO_TYPE_WRITE) { 30926f793812SPavel Zakharov ASSERT(spa->spa_trust_config); 30936f793812SPavel Zakharov 30946f793812SPavel Zakharov if (zio->io_vd->vdev_removing) { 30956f793812SPavel Zakharov ASSERT(zio->io_flags & 30966f793812SPavel Zakharov (ZIO_FLAG_PHYSICAL | ZIO_FLAG_SELF_HEAL | 30976f793812SPavel Zakharov ZIO_FLAG_INDUCE_DAMAGE)); 30986f793812SPavel Zakharov } 30995cabbc6bSPrashanth Sreenivasa } 31000f7643c7SGeorge Wilson 310144ecc532SGeorge Wilson /* 310244ecc532SGeorge Wilson * We keep track of time-sensitive I/Os so that the scan thread 310344ecc532SGeorge Wilson * can quickly react to certain workloads. In particular, we care 310444ecc532SGeorge Wilson * about non-scrubbing, top-level reads and writes with the following 310544ecc532SGeorge Wilson * characteristics: 3106738f37bcSGeorge Wilson * - synchronous writes of user data to non-slog devices 310744ecc532SGeorge Wilson * - any reads of user data 310844ecc532SGeorge Wilson * When these conditions are met, adjust the timestamp of spa_last_io 310944ecc532SGeorge Wilson * which allows the scan thread to adjust its workload accordingly. 311044ecc532SGeorge Wilson */ 311144ecc532SGeorge Wilson if (!(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && zio->io_bp != NULL && 311244ecc532SGeorge Wilson vd == vd->vdev_top && !vd->vdev_islog && 311344ecc532SGeorge Wilson zio->io_bookmark.zb_objset != DMU_META_OBJSET && 311444ecc532SGeorge Wilson zio->io_txg != spa_syncing_txg(spa)) { 311544ecc532SGeorge Wilson uint64_t old = spa->spa_last_io; 311644ecc532SGeorge Wilson uint64_t new = ddi_get_lbolt64(); 311744ecc532SGeorge Wilson if (old != new) 311844ecc532SGeorge Wilson (void) atomic_cas_64(&spa->spa_last_io, old, new); 311944ecc532SGeorge Wilson } 312044ecc532SGeorge Wilson 3121e14bb325SJeff Bonwick align = 1ULL << vd->vdev_top->vdev_ashift; 3122e14bb325SJeff Bonwick 31232a104a52SAlex Reece if (!(zio->io_flags & ZIO_FLAG_PHYSICAL) && 31242a104a52SAlex Reece P2PHASE(zio->io_size, align) != 0) { 31252a104a52SAlex Reece /* Transform logical writes to be a full physical block size. */ 3126ecc2d604Sbonwick uint64_t asize = P2ROUNDUP(zio->io_size, align); 3127770499e1SDan Kimmel abd_t *abuf = abd_alloc_sametype(zio->io_abd, asize); 3128e14bb325SJeff Bonwick ASSERT(vd == vd->vdev_top); 3129ecc2d604Sbonwick if (zio->io_type == ZIO_TYPE_WRITE) { 3130770499e1SDan Kimmel abd_copy(abuf, zio->io_abd, zio->io_size); 3131770499e1SDan Kimmel abd_zero_off(abuf, zio->io_size, asize - zio->io_size); 3132ecc2d604Sbonwick } 3133e14bb325SJeff Bonwick zio_push_transform(zio, abuf, asize, asize, zio_subblock); 3134ecc2d604Sbonwick } 3135ecc2d604Sbonwick 31362a104a52SAlex Reece /* 31372a104a52SAlex Reece * If this is not a physical io, make sure that it is properly aligned 31382a104a52SAlex Reece * before proceeding. 31392a104a52SAlex Reece */ 31402a104a52SAlex Reece if (!(zio->io_flags & ZIO_FLAG_PHYSICAL)) { 31412a104a52SAlex Reece ASSERT0(P2PHASE(zio->io_offset, align)); 31422a104a52SAlex Reece ASSERT0(P2PHASE(zio->io_size, align)); 31432a104a52SAlex Reece } else { 31442a104a52SAlex Reece /* 31452a104a52SAlex Reece * For physical writes, we allow 512b aligned writes and assume 31462a104a52SAlex Reece * the device will perform a read-modify-write as necessary. 31472a104a52SAlex Reece */ 31482a104a52SAlex Reece ASSERT0(P2PHASE(zio->io_offset, SPA_MINBLOCKSIZE)); 31492a104a52SAlex Reece ASSERT0(P2PHASE(zio->io_size, SPA_MINBLOCKSIZE)); 31502a104a52SAlex Reece } 31512a104a52SAlex Reece 3152f9af39baSGeorge Wilson VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa)); 31538ad4d6ddSJeff Bonwick 31548ad4d6ddSJeff Bonwick /* 31558ad4d6ddSJeff Bonwick * If this is a repair I/O, and there's no self-healing involved -- 31568ad4d6ddSJeff Bonwick * that is, we're just resilvering what we expect to resilver -- 31578ad4d6ddSJeff Bonwick * then don't do the I/O unless zio's txg is actually in vd's DTL. 31588ad4d6ddSJeff Bonwick * This prevents spurious resilvering with nested replication. 31598ad4d6ddSJeff Bonwick * For example, given a mirror of mirrors, (A+B)+(C+D), if only 31608ad4d6ddSJeff Bonwick * A is out of date, we'll read from C+D, then use the data to 31618ad4d6ddSJeff Bonwick * resilver A+B -- but we don't actually want to resilver B, just A. 31628ad4d6ddSJeff Bonwick * The top-level mirror has no way to know this, so instead we just 31638ad4d6ddSJeff Bonwick * discard unnecessary repairs as we work our way down the vdev tree. 31648ad4d6ddSJeff Bonwick * The same logic applies to any form of nested replication: 31658ad4d6ddSJeff Bonwick * ditto + mirror, RAID-Z + replacing, etc. This covers them all. 31668ad4d6ddSJeff Bonwick */ 31678ad4d6ddSJeff Bonwick if ((zio->io_flags & ZIO_FLAG_IO_REPAIR) && 31688ad4d6ddSJeff Bonwick !(zio->io_flags & ZIO_FLAG_SELF_HEAL) && 31698ad4d6ddSJeff Bonwick zio->io_txg != 0 && /* not a delegated i/o */ 31708ad4d6ddSJeff Bonwick !vdev_dtl_contains(vd, DTL_PARTIAL, zio->io_txg, 1)) { 31718ad4d6ddSJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_WRITE); 31728ad4d6ddSJeff Bonwick zio_vdev_io_bypass(zio); 31738ad4d6ddSJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 31748ad4d6ddSJeff Bonwick } 3175fa9e4066Sahrens 3176e14bb325SJeff Bonwick if (vd->vdev_ops->vdev_op_leaf && 3177e14bb325SJeff Bonwick (zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE)) { 3178e14bb325SJeff Bonwick 317943466aaeSMax Grossman if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio)) 3180a3f829aeSBill Moore return (ZIO_PIPELINE_CONTINUE); 3181e14bb325SJeff Bonwick 3182e14bb325SJeff Bonwick if ((zio = vdev_queue_io(zio)) == NULL) 3183e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3184e14bb325SJeff Bonwick 3185e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 3186be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(ENXIO); 3187e14bb325SJeff Bonwick zio_interrupt(zio); 3188e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3189e14bb325SJeff Bonwick } 3190e14bb325SJeff Bonwick } 3191e14bb325SJeff Bonwick 3192738f37bcSGeorge Wilson vd->vdev_ops->vdev_op_io_start(zio); 3193738f37bcSGeorge Wilson return (ZIO_PIPELINE_STOP); 3194fa9e4066Sahrens } 3195fa9e4066Sahrens 3196e05725b1Sbonwick static int 3197fa9e4066Sahrens zio_vdev_io_done(zio_t *zio) 3198fa9e4066Sahrens { 3199e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 3200e14bb325SJeff Bonwick vdev_ops_t *ops = vd ? vd->vdev_ops : &vdev_mirror_ops; 3201e14bb325SJeff Bonwick boolean_t unexpected_error = B_FALSE; 3202e05725b1Sbonwick 3203d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_VDEV_BIT, ZIO_WAIT_DONE)) { 3204e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3205d6e1c446SGeorge Wilson } 3206fa9e4066Sahrens 3207e14bb325SJeff Bonwick ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); 3208e14bb325SJeff Bonwick 3209e14bb325SJeff Bonwick if (vd != NULL && vd->vdev_ops->vdev_op_leaf) { 3210e14bb325SJeff Bonwick 3211e14bb325SJeff Bonwick vdev_queue_io_done(zio); 3212fa9e4066Sahrens 3213e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE) 3214e14bb325SJeff Bonwick vdev_cache_write(zio); 3215e14bb325SJeff Bonwick 3216e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 32178956713aSEric Schrock zio->io_error = zio_handle_device_injection(vd, 32188956713aSEric Schrock zio, EIO); 3219e14bb325SJeff Bonwick 3220e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 3221e14bb325SJeff Bonwick zio->io_error = zio_handle_label_injection(zio, EIO); 3222e14bb325SJeff Bonwick 3223e14bb325SJeff Bonwick if (zio->io_error) { 3224e14bb325SJeff Bonwick if (!vdev_accessible(vd, zio)) { 3225be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(ENXIO); 3226e14bb325SJeff Bonwick } else { 3227e14bb325SJeff Bonwick unexpected_error = B_TRUE; 3228e14bb325SJeff Bonwick } 3229e14bb325SJeff Bonwick } 323051ece835Seschrock } 3231fa9e4066Sahrens 3232e14bb325SJeff Bonwick ops->vdev_op_io_done(zio); 3233e14bb325SJeff Bonwick 3234e14bb325SJeff Bonwick if (unexpected_error) 3235a3f829aeSBill Moore VERIFY(vdev_probe(vd, zio) == NULL); 3236e14bb325SJeff Bonwick 3237e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 3238fa9e4066Sahrens } 3239fa9e4066Sahrens 324022fe2c88SJonathan Adams /* 324122fe2c88SJonathan Adams * For non-raidz ZIOs, we can just copy aside the bad data read from the 324222fe2c88SJonathan Adams * disk, and use that to finish the checksum ereport later. 324322fe2c88SJonathan Adams */ 324422fe2c88SJonathan Adams static void 324522fe2c88SJonathan Adams zio_vsd_default_cksum_finish(zio_cksum_report_t *zcr, 324622fe2c88SJonathan Adams const void *good_buf) 324722fe2c88SJonathan Adams { 324822fe2c88SJonathan Adams /* no processing needed */ 324922fe2c88SJonathan Adams zfs_ereport_finish_checksum(zcr, good_buf, zcr->zcr_cbdata, B_FALSE); 325022fe2c88SJonathan Adams } 325122fe2c88SJonathan Adams 325222fe2c88SJonathan Adams /*ARGSUSED*/ 325322fe2c88SJonathan Adams void 325422fe2c88SJonathan Adams zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr, void *ignored) 325522fe2c88SJonathan Adams { 325622fe2c88SJonathan Adams void *buf = zio_buf_alloc(zio->io_size); 325722fe2c88SJonathan Adams 3258770499e1SDan Kimmel abd_copy_to_buf(buf, zio->io_abd, zio->io_size); 325922fe2c88SJonathan Adams 326022fe2c88SJonathan Adams zcr->zcr_cbinfo = zio->io_size; 326122fe2c88SJonathan Adams zcr->zcr_cbdata = buf; 326222fe2c88SJonathan Adams zcr->zcr_finish = zio_vsd_default_cksum_finish; 326322fe2c88SJonathan Adams zcr->zcr_free = zio_buf_free; 326422fe2c88SJonathan Adams } 326522fe2c88SJonathan Adams 3266e05725b1Sbonwick static int 3267fa9e4066Sahrens zio_vdev_io_assess(zio_t *zio) 3268fa9e4066Sahrens { 3269fa9e4066Sahrens vdev_t *vd = zio->io_vd; 3270e14bb325SJeff Bonwick 3271d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_VDEV_BIT, ZIO_WAIT_DONE)) { 3272e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3273d6e1c446SGeorge Wilson } 3274e14bb325SJeff Bonwick 3275e14bb325SJeff Bonwick if (vd == NULL && !(zio->io_flags & ZIO_FLAG_CONFIG_WRITER)) 3276e14bb325SJeff Bonwick spa_config_exit(zio->io_spa, SCL_ZIO, zio); 3277e14bb325SJeff Bonwick 3278e14bb325SJeff Bonwick if (zio->io_vsd != NULL) { 327922fe2c88SJonathan Adams zio->io_vsd_ops->vsd_free(zio); 3280e14bb325SJeff Bonwick zio->io_vsd = NULL; 3281ecc2d604Sbonwick } 3282ecc2d604Sbonwick 3283e14bb325SJeff Bonwick if (zio_injection_enabled && zio->io_error == 0) 3284ea8dc4b6Seschrock zio->io_error = zio_handle_fault_injection(zio, EIO); 3285ea8dc4b6Seschrock 3286fa9e4066Sahrens /* 3287fa9e4066Sahrens * If the I/O failed, determine whether we should attempt to retry it. 328835a5a358SJonathan Adams * 328935a5a358SJonathan Adams * On retry, we cut in line in the issue queue, since we don't want 329035a5a358SJonathan Adams * compression/checksumming/etc. work to prevent our (cheap) IO reissue. 3291fa9e4066Sahrens */ 3292e14bb325SJeff Bonwick if (zio->io_error && vd == NULL && 3293e14bb325SJeff Bonwick !(zio->io_flags & (ZIO_FLAG_DONT_RETRY | ZIO_FLAG_IO_RETRY))) { 3294e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_DONT_QUEUE)); /* not a leaf */ 3295e14bb325SJeff Bonwick ASSERT(!(zio->io_flags & ZIO_FLAG_IO_BYPASS)); /* not a leaf */ 3296fa9e4066Sahrens zio->io_error = 0; 3297e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_IO_RETRY | 3298e14bb325SJeff Bonwick ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE; 3299b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_START >> 1; 330035a5a358SJonathan Adams zio_taskq_dispatch(zio, ZIO_TASKQ_ISSUE, 330135a5a358SJonathan Adams zio_requeue_io_start_cut_in_line); 3302e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3303ea8dc4b6Seschrock } 3304fa9e4066Sahrens 3305e14bb325SJeff Bonwick /* 3306e14bb325SJeff Bonwick * If we got an error on a leaf device, convert it to ENXIO 3307e14bb325SJeff Bonwick * if the device is not accessible at all. 3308e14bb325SJeff Bonwick */ 3309e14bb325SJeff Bonwick if (zio->io_error && vd != NULL && vd->vdev_ops->vdev_op_leaf && 3310e14bb325SJeff Bonwick !vdev_accessible(vd, zio)) 3311be6fd75aSMatthew Ahrens zio->io_error = SET_ERROR(ENXIO); 3312e14bb325SJeff Bonwick 3313e14bb325SJeff Bonwick /* 3314e14bb325SJeff Bonwick * If we can't write to an interior vdev (mirror or RAID-Z), 3315e14bb325SJeff Bonwick * set vdev_cant_write so that we stop trying to allocate from it. 3316e14bb325SJeff Bonwick */ 3317e14bb325SJeff Bonwick if (zio->io_error == ENXIO && zio->io_type == ZIO_TYPE_WRITE && 33183b2aab18SMatthew Ahrens vd != NULL && !vd->vdev_ops->vdev_op_leaf) { 3319e14bb325SJeff Bonwick vd->vdev_cant_write = B_TRUE; 33203b2aab18SMatthew Ahrens } 3321e14bb325SJeff Bonwick 3322295438baSHans Rosenfeld /* 3323295438baSHans Rosenfeld * If a cache flush returns ENOTSUP or ENOTTY, we know that no future 3324295438baSHans Rosenfeld * attempts will ever succeed. In this case we set a persistent bit so 3325295438baSHans Rosenfeld * that we don't bother with it in the future. 3326295438baSHans Rosenfeld */ 3327295438baSHans Rosenfeld if ((zio->io_error == ENOTSUP || zio->io_error == ENOTTY) && 3328295438baSHans Rosenfeld zio->io_type == ZIO_TYPE_IOCTL && 3329295438baSHans Rosenfeld zio->io_cmd == DKIOCFLUSHWRITECACHE && vd != NULL) 3330295438baSHans Rosenfeld vd->vdev_nowritecache = B_TRUE; 3331295438baSHans Rosenfeld 3332e14bb325SJeff Bonwick if (zio->io_error) 3333e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 3334e14bb325SJeff Bonwick 333569962b56SMatthew Ahrens if (vd != NULL && vd->vdev_ops->vdev_op_leaf && 333669962b56SMatthew Ahrens zio->io_physdone != NULL) { 333769962b56SMatthew Ahrens ASSERT(!(zio->io_flags & ZIO_FLAG_DELEGATED)); 333869962b56SMatthew Ahrens ASSERT(zio->io_child_type == ZIO_CHILD_VDEV); 333969962b56SMatthew Ahrens zio->io_physdone(zio->io_logical); 334069962b56SMatthew Ahrens } 334169962b56SMatthew Ahrens 3342e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 3343fa9e4066Sahrens } 3344fa9e4066Sahrens 3345fa9e4066Sahrens void 3346fa9e4066Sahrens zio_vdev_io_reissue(zio_t *zio) 3347fa9e4066Sahrens { 3348fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 3349fa9e4066Sahrens ASSERT(zio->io_error == 0); 3350fa9e4066Sahrens 3351b24ab676SJeff Bonwick zio->io_stage >>= 1; 3352fa9e4066Sahrens } 3353fa9e4066Sahrens 3354fa9e4066Sahrens void 3355fa9e4066Sahrens zio_vdev_io_redone(zio_t *zio) 3356fa9e4066Sahrens { 3357fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_DONE); 3358fa9e4066Sahrens 3359b24ab676SJeff Bonwick zio->io_stage >>= 1; 3360fa9e4066Sahrens } 3361fa9e4066Sahrens 3362fa9e4066Sahrens void 3363fa9e4066Sahrens zio_vdev_io_bypass(zio_t *zio) 3364fa9e4066Sahrens { 3365fa9e4066Sahrens ASSERT(zio->io_stage == ZIO_STAGE_VDEV_IO_START); 3366fa9e4066Sahrens ASSERT(zio->io_error == 0); 3367fa9e4066Sahrens 3368fa9e4066Sahrens zio->io_flags |= ZIO_FLAG_IO_BYPASS; 3369b24ab676SJeff Bonwick zio->io_stage = ZIO_STAGE_VDEV_IO_ASSESS >> 1; 3370fa9e4066Sahrens } 3371fa9e4066Sahrens 3372fa9e4066Sahrens /* 3373fa9e4066Sahrens * ========================================================================== 3374fa9e4066Sahrens * Generate and verify checksums 3375fa9e4066Sahrens * ========================================================================== 3376fa9e4066Sahrens */ 3377e05725b1Sbonwick static int 3378fa9e4066Sahrens zio_checksum_generate(zio_t *zio) 3379fa9e4066Sahrens { 3380fa9e4066Sahrens blkptr_t *bp = zio->io_bp; 3381e14bb325SJeff Bonwick enum zio_checksum checksum; 3382fa9e4066Sahrens 3383e14bb325SJeff Bonwick if (bp == NULL) { 3384e14bb325SJeff Bonwick /* 3385e14bb325SJeff Bonwick * This is zio_write_phys(). 3386e14bb325SJeff Bonwick * We're either generating a label checksum, or none at all. 3387e14bb325SJeff Bonwick */ 3388e14bb325SJeff Bonwick checksum = zio->io_prop.zp_checksum; 3389e14bb325SJeff Bonwick 3390e14bb325SJeff Bonwick if (checksum == ZIO_CHECKSUM_OFF) 3391e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 3392fa9e4066Sahrens 3393e14bb325SJeff Bonwick ASSERT(checksum == ZIO_CHECKSUM_LABEL); 3394e14bb325SJeff Bonwick } else { 3395e14bb325SJeff Bonwick if (BP_IS_GANG(bp) && zio->io_child_type == ZIO_CHILD_GANG) { 3396e14bb325SJeff Bonwick ASSERT(!IO_IS_ALLOCATING(zio)); 3397e14bb325SJeff Bonwick checksum = ZIO_CHECKSUM_GANG_HEADER; 3398e14bb325SJeff Bonwick } else { 3399e14bb325SJeff Bonwick checksum = BP_GET_CHECKSUM(bp); 3400e14bb325SJeff Bonwick } 3401e14bb325SJeff Bonwick } 3402fa9e4066Sahrens 3403770499e1SDan Kimmel zio_checksum_compute(zio, checksum, zio->io_abd, zio->io_size); 3404fa9e4066Sahrens 3405e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 3406fa9e4066Sahrens } 3407fa9e4066Sahrens 3408e05725b1Sbonwick static int 3409e14bb325SJeff Bonwick zio_checksum_verify(zio_t *zio) 3410fa9e4066Sahrens { 341122fe2c88SJonathan Adams zio_bad_cksum_t info; 3412e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 3413e14bb325SJeff Bonwick int error; 3414fa9e4066Sahrens 3415b24ab676SJeff Bonwick ASSERT(zio->io_vd != NULL); 3416b24ab676SJeff Bonwick 3417e14bb325SJeff Bonwick if (bp == NULL) { 3418e14bb325SJeff Bonwick /* 3419e14bb325SJeff Bonwick * This is zio_read_phys(). 3420e14bb325SJeff Bonwick * We're either verifying a label checksum, or nothing at all. 3421e14bb325SJeff Bonwick */ 3422e14bb325SJeff Bonwick if (zio->io_prop.zp_checksum == ZIO_CHECKSUM_OFF) 3423e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 3424fa9e4066Sahrens 3425e14bb325SJeff Bonwick ASSERT(zio->io_prop.zp_checksum == ZIO_CHECKSUM_LABEL); 3426e14bb325SJeff Bonwick } 3427fa9e4066Sahrens 342822fe2c88SJonathan Adams if ((error = zio_checksum_error(zio, &info)) != 0) { 3429e14bb325SJeff Bonwick zio->io_error = error; 3430373dc1cfSMatthew Ahrens if (error == ECKSUM && 3431373dc1cfSMatthew Ahrens !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) { 343222fe2c88SJonathan Adams zfs_ereport_start_checksum(zio->io_spa, 343322fe2c88SJonathan Adams zio->io_vd, zio, zio->io_offset, 343422fe2c88SJonathan Adams zio->io_size, NULL, &info); 3435e14bb325SJeff Bonwick } 3436fa9e4066Sahrens } 3437fa9e4066Sahrens 3438e05725b1Sbonwick return (ZIO_PIPELINE_CONTINUE); 3439fa9e4066Sahrens } 3440fa9e4066Sahrens 3441fa9e4066Sahrens /* 3442fa9e4066Sahrens * Called by RAID-Z to ensure we don't compute the checksum twice. 3443fa9e4066Sahrens */ 3444fa9e4066Sahrens void 3445fa9e4066Sahrens zio_checksum_verified(zio_t *zio) 3446fa9e4066Sahrens { 3447b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_STAGE_CHECKSUM_VERIFY; 3448fa9e4066Sahrens } 3449fa9e4066Sahrens 3450fa9e4066Sahrens /* 3451e14bb325SJeff Bonwick * ========================================================================== 3452e14bb325SJeff Bonwick * Error rank. Error are ranked in the order 0, ENXIO, ECKSUM, EIO, other. 34535d7b4d43SMatthew Ahrens * An error of 0 indicates success. ENXIO indicates whole-device failure, 3454e14bb325SJeff Bonwick * which may be transient (e.g. unplugged) or permament. ECKSUM and EIO 3455e14bb325SJeff Bonwick * indicate errors that are specific to one I/O, and most likely permanent. 3456e14bb325SJeff Bonwick * Any other error is presumed to be worse because we weren't expecting it. 3457e14bb325SJeff Bonwick * ========================================================================== 3458fa9e4066Sahrens */ 3459e14bb325SJeff Bonwick int 3460e14bb325SJeff Bonwick zio_worst_error(int e1, int e2) 3461fa9e4066Sahrens { 3462e14bb325SJeff Bonwick static int zio_error_rank[] = { 0, ENXIO, ECKSUM, EIO }; 3463e14bb325SJeff Bonwick int r1, r2; 3464e14bb325SJeff Bonwick 3465e14bb325SJeff Bonwick for (r1 = 0; r1 < sizeof (zio_error_rank) / sizeof (int); r1++) 3466e14bb325SJeff Bonwick if (e1 == zio_error_rank[r1]) 3467e14bb325SJeff Bonwick break; 3468e14bb325SJeff Bonwick 3469e14bb325SJeff Bonwick for (r2 = 0; r2 < sizeof (zio_error_rank) / sizeof (int); r2++) 3470e14bb325SJeff Bonwick if (e2 == zio_error_rank[r2]) 3471e14bb325SJeff Bonwick break; 347244cd46caSbillm 3473e14bb325SJeff Bonwick return (r1 > r2 ? e1 : e2); 3474fa9e4066Sahrens } 3475fa9e4066Sahrens 3476fa9e4066Sahrens /* 3477fa9e4066Sahrens * ========================================================================== 3478e14bb325SJeff Bonwick * I/O completion 3479fa9e4066Sahrens * ========================================================================== 3480fa9e4066Sahrens */ 3481e14bb325SJeff Bonwick static int 3482e14bb325SJeff Bonwick zio_ready(zio_t *zio) 3483fa9e4066Sahrens { 3484e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 3485a3f829aeSBill Moore zio_t *pio, *pio_next; 34860f7643c7SGeorge Wilson zio_link_t *zl = NULL; 3487fa9e4066Sahrens 3488d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_GANG_BIT | ZIO_CHILD_DDT_BIT, 3489d6e1c446SGeorge Wilson ZIO_WAIT_READY)) { 3490f5383399SBill Moore return (ZIO_PIPELINE_STOP); 3491d6e1c446SGeorge Wilson } 3492fa9e4066Sahrens 3493f5383399SBill Moore if (zio->io_ready) { 3494e14bb325SJeff Bonwick ASSERT(IO_IS_ALLOCATING(zio)); 349580901aeaSGeorge Wilson ASSERT(bp->blk_birth == zio->io_txg || BP_IS_HOLE(bp) || 349680901aeaSGeorge Wilson (zio->io_flags & ZIO_FLAG_NOPWRITE)); 3497e14bb325SJeff Bonwick ASSERT(zio->io_children[ZIO_CHILD_GANG][ZIO_WAIT_READY] == 0); 3498fa9e4066Sahrens 3499e14bb325SJeff Bonwick zio->io_ready(zio); 3500e14bb325SJeff Bonwick } 3501fa9e4066Sahrens 3502e14bb325SJeff Bonwick if (bp != NULL && bp != &zio->io_bp_copy) 3503e14bb325SJeff Bonwick zio->io_bp_copy = *bp; 3504fa9e4066Sahrens 35050f7643c7SGeorge Wilson if (zio->io_error != 0) { 3506e14bb325SJeff Bonwick zio->io_pipeline = ZIO_INTERLOCK_PIPELINE; 3507fa9e4066Sahrens 35080f7643c7SGeorge Wilson if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING) { 35090f7643c7SGeorge Wilson ASSERT(IO_IS_ALLOCATING(zio)); 35100f7643c7SGeorge Wilson ASSERT(zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); 35110f7643c7SGeorge Wilson /* 35120f7643c7SGeorge Wilson * We were unable to allocate anything, unreserve and 35130f7643c7SGeorge Wilson * issue the next I/O to allocate. 35140f7643c7SGeorge Wilson */ 35150f7643c7SGeorge Wilson metaslab_class_throttle_unreserve( 35160f7643c7SGeorge Wilson spa_normal_class(zio->io_spa), 3517*f78cdc34SPaul Dagnelie zio->io_prop.zp_copies, zio->io_allocator, zio); 3518*f78cdc34SPaul Dagnelie zio_allocate_dispatch(zio->io_spa, zio->io_allocator); 35190f7643c7SGeorge Wilson } 35200f7643c7SGeorge Wilson } 35210f7643c7SGeorge Wilson 3522a3f829aeSBill Moore mutex_enter(&zio->io_lock); 3523a3f829aeSBill Moore zio->io_state[ZIO_WAIT_READY] = 1; 35240f7643c7SGeorge Wilson pio = zio_walk_parents(zio, &zl); 3525a3f829aeSBill Moore mutex_exit(&zio->io_lock); 3526a3f829aeSBill Moore 3527a3f829aeSBill Moore /* 3528a3f829aeSBill Moore * As we notify zio's parents, new parents could be added. 3529a3f829aeSBill Moore * New parents go to the head of zio's io_parent_list, however, 3530a3f829aeSBill Moore * so we will (correctly) not notify them. The remainder of zio's 3531a3f829aeSBill Moore * io_parent_list, from 'pio_next' onward, cannot change because 3532a3f829aeSBill Moore * all parents must wait for us to be done before they can be done. 3533a3f829aeSBill Moore */ 3534a3f829aeSBill Moore for (; pio != NULL; pio = pio_next) { 35350f7643c7SGeorge Wilson pio_next = zio_walk_parents(zio, &zl); 3536e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_READY); 3537a3f829aeSBill Moore } 3538fa9e4066Sahrens 3539b24ab676SJeff Bonwick if (zio->io_flags & ZIO_FLAG_NODATA) { 3540b24ab676SJeff Bonwick if (BP_IS_GANG(bp)) { 3541b24ab676SJeff Bonwick zio->io_flags &= ~ZIO_FLAG_NODATA; 3542b24ab676SJeff Bonwick } else { 3543770499e1SDan Kimmel ASSERT((uintptr_t)zio->io_abd < SPA_MAXBLOCKSIZE); 3544b24ab676SJeff Bonwick zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 3545b24ab676SJeff Bonwick } 3546b24ab676SJeff Bonwick } 3547b24ab676SJeff Bonwick 3548a33cae98STim Haley if (zio_injection_enabled && 3549a33cae98STim Haley zio->io_spa->spa_syncing_txg == zio->io_txg) 3550a33cae98STim Haley zio_handle_ignored_writes(zio); 3551a33cae98STim Haley 3552e14bb325SJeff Bonwick return (ZIO_PIPELINE_CONTINUE); 3553fa9e4066Sahrens } 3554fa9e4066Sahrens 35550f7643c7SGeorge Wilson /* 35560f7643c7SGeorge Wilson * Update the allocation throttle accounting. 35570f7643c7SGeorge Wilson */ 35580f7643c7SGeorge Wilson static void 35590f7643c7SGeorge Wilson zio_dva_throttle_done(zio_t *zio) 35600f7643c7SGeorge Wilson { 35610f7643c7SGeorge Wilson zio_t *lio = zio->io_logical; 35620f7643c7SGeorge Wilson zio_t *pio = zio_unique_parent(zio); 35630f7643c7SGeorge Wilson vdev_t *vd = zio->io_vd; 35640f7643c7SGeorge Wilson int flags = METASLAB_ASYNC_ALLOC; 35650f7643c7SGeorge Wilson 35660f7643c7SGeorge Wilson ASSERT3P(zio->io_bp, !=, NULL); 35670f7643c7SGeorge Wilson ASSERT3U(zio->io_type, ==, ZIO_TYPE_WRITE); 35680f7643c7SGeorge Wilson ASSERT3U(zio->io_priority, ==, ZIO_PRIORITY_ASYNC_WRITE); 35690f7643c7SGeorge Wilson ASSERT3U(zio->io_child_type, ==, ZIO_CHILD_VDEV); 35700f7643c7SGeorge Wilson ASSERT(vd != NULL); 35710f7643c7SGeorge Wilson ASSERT3P(vd, ==, vd->vdev_top); 35720f7643c7SGeorge Wilson ASSERT(!(zio->io_flags & (ZIO_FLAG_IO_REPAIR | ZIO_FLAG_IO_RETRY))); 35730f7643c7SGeorge Wilson ASSERT(zio->io_flags & ZIO_FLAG_IO_ALLOCATING); 35740f7643c7SGeorge Wilson ASSERT(!(lio->io_flags & ZIO_FLAG_IO_REWRITE)); 35750f7643c7SGeorge Wilson ASSERT(!(lio->io_orig_flags & ZIO_FLAG_NODATA)); 35760f7643c7SGeorge Wilson 35770f7643c7SGeorge Wilson /* 35780f7643c7SGeorge Wilson * Parents of gang children can have two flavors -- ones that 35790f7643c7SGeorge Wilson * allocated the gang header (will have ZIO_FLAG_IO_REWRITE set) 35800f7643c7SGeorge Wilson * and ones that allocated the constituent blocks. The allocation 35810f7643c7SGeorge Wilson * throttle needs to know the allocating parent zio so we must find 35820f7643c7SGeorge Wilson * it here. 35830f7643c7SGeorge Wilson */ 35840f7643c7SGeorge Wilson if (pio->io_child_type == ZIO_CHILD_GANG) { 35850f7643c7SGeorge Wilson /* 35860f7643c7SGeorge Wilson * If our parent is a rewrite gang child then our grandparent 35870f7643c7SGeorge Wilson * would have been the one that performed the allocation. 35880f7643c7SGeorge Wilson */ 35890f7643c7SGeorge Wilson if (pio->io_flags & ZIO_FLAG_IO_REWRITE) 35900f7643c7SGeorge Wilson pio = zio_unique_parent(pio); 35910f7643c7SGeorge Wilson flags |= METASLAB_GANG_CHILD; 35920f7643c7SGeorge Wilson } 35930f7643c7SGeorge Wilson 35940f7643c7SGeorge Wilson ASSERT(IO_IS_ALLOCATING(pio)); 35950f7643c7SGeorge Wilson ASSERT3P(zio, !=, zio->io_logical); 35960f7643c7SGeorge Wilson ASSERT(zio->io_logical != NULL); 35970f7643c7SGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_IO_REPAIR)); 35980f7643c7SGeorge Wilson ASSERT0(zio->io_flags & ZIO_FLAG_NOPWRITE); 35990f7643c7SGeorge Wilson 36000f7643c7SGeorge Wilson mutex_enter(&pio->io_lock); 3601*f78cdc34SPaul Dagnelie metaslab_group_alloc_decrement(zio->io_spa, vd->vdev_id, pio, flags, 3602*f78cdc34SPaul Dagnelie pio->io_allocator, B_TRUE); 36030f7643c7SGeorge Wilson mutex_exit(&pio->io_lock); 36040f7643c7SGeorge Wilson 36050f7643c7SGeorge Wilson metaslab_class_throttle_unreserve(spa_normal_class(zio->io_spa), 3606*f78cdc34SPaul Dagnelie 1, pio->io_allocator, pio); 36070f7643c7SGeorge Wilson 36080f7643c7SGeorge Wilson /* 36090f7643c7SGeorge Wilson * Call into the pipeline to see if there is more work that 36100f7643c7SGeorge Wilson * needs to be done. If there is work to be done it will be 36110f7643c7SGeorge Wilson * dispatched to another taskq thread. 36120f7643c7SGeorge Wilson */ 3613*f78cdc34SPaul Dagnelie zio_allocate_dispatch(zio->io_spa, pio->io_allocator); 36140f7643c7SGeorge Wilson } 36150f7643c7SGeorge Wilson 3616e14bb325SJeff Bonwick static int 3617e14bb325SJeff Bonwick zio_done(zio_t *zio) 3618d63d470bSgw { 3619e14bb325SJeff Bonwick spa_t *spa = zio->io_spa; 3620e14bb325SJeff Bonwick zio_t *lio = zio->io_logical; 3621e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 3622e14bb325SJeff Bonwick vdev_t *vd = zio->io_vd; 3623e14bb325SJeff Bonwick uint64_t psize = zio->io_size; 3624a3f829aeSBill Moore zio_t *pio, *pio_next; 36250f7643c7SGeorge Wilson metaslab_class_t *mc = spa_normal_class(spa); 36260f7643c7SGeorge Wilson zio_link_t *zl = NULL; 3627d63d470bSgw 3628e14bb325SJeff Bonwick /* 3629f5383399SBill Moore * If our children haven't all completed, 3630e14bb325SJeff Bonwick * wait for them and then repeat this pipeline stage. 3631e14bb325SJeff Bonwick */ 3632d6e1c446SGeorge Wilson if (zio_wait_for_children(zio, ZIO_CHILD_ALL_BITS, ZIO_WAIT_DONE)) { 3633e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3634d6e1c446SGeorge Wilson } 3635d63d470bSgw 36360f7643c7SGeorge Wilson /* 36370f7643c7SGeorge Wilson * If the allocation throttle is enabled, then update the accounting. 36380f7643c7SGeorge Wilson * We only track child I/Os that are part of an allocating async 36390f7643c7SGeorge Wilson * write. We must do this since the allocation is performed 36400f7643c7SGeorge Wilson * by the logical I/O but the actual write is done by child I/Os. 36410f7643c7SGeorge Wilson */ 36420f7643c7SGeorge Wilson if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING && 36430f7643c7SGeorge Wilson zio->io_child_type == ZIO_CHILD_VDEV) { 36440f7643c7SGeorge Wilson ASSERT(mc->mc_alloc_throttle_enabled); 36450f7643c7SGeorge Wilson zio_dva_throttle_done(zio); 36460f7643c7SGeorge Wilson } 36470f7643c7SGeorge Wilson 36480f7643c7SGeorge Wilson /* 36490f7643c7SGeorge Wilson * If the allocation throttle is enabled, verify that 36500f7643c7SGeorge Wilson * we have decremented the refcounts for every I/O that was throttled. 36510f7643c7SGeorge Wilson */ 36520f7643c7SGeorge Wilson if (zio->io_flags & ZIO_FLAG_IO_ALLOCATING) { 36530f7643c7SGeorge Wilson ASSERT(zio->io_type == ZIO_TYPE_WRITE); 36540f7643c7SGeorge Wilson ASSERT(zio->io_priority == ZIO_PRIORITY_ASYNC_WRITE); 36550f7643c7SGeorge Wilson ASSERT(bp != NULL); 3656*f78cdc34SPaul Dagnelie metaslab_group_alloc_verify(spa, zio->io_bp, zio, 3657*f78cdc34SPaul Dagnelie zio->io_allocator); 3658*f78cdc34SPaul Dagnelie VERIFY(refcount_not_held(&mc->mc_alloc_slots[zio->io_allocator], 3659*f78cdc34SPaul Dagnelie zio)); 36600f7643c7SGeorge Wilson } 36610f7643c7SGeorge Wilson 3662e14bb325SJeff Bonwick for (int c = 0; c < ZIO_CHILD_TYPES; c++) 3663e14bb325SJeff Bonwick for (int w = 0; w < ZIO_WAIT_TYPES; w++) 3664e14bb325SJeff Bonwick ASSERT(zio->io_children[c][w] == 0); 3665e14bb325SJeff Bonwick 36665d7b4d43SMatthew Ahrens if (bp != NULL && !BP_IS_EMBEDDED(bp)) { 3667e14bb325SJeff Bonwick ASSERT(bp->blk_pad[0] == 0); 3668e14bb325SJeff Bonwick ASSERT(bp->blk_pad[1] == 0); 3669e14bb325SJeff Bonwick ASSERT(bcmp(bp, &zio->io_bp_copy, sizeof (blkptr_t)) == 0 || 3670a3f829aeSBill Moore (bp == zio_unique_parent(zio)->io_bp)); 3671e14bb325SJeff Bonwick if (zio->io_type == ZIO_TYPE_WRITE && !BP_IS_HOLE(bp) && 3672b24ab676SJeff Bonwick zio->io_bp_override == NULL && 3673e14bb325SJeff Bonwick !(zio->io_flags & ZIO_FLAG_IO_REPAIR)) { 3674e14bb325SJeff Bonwick ASSERT(!BP_SHOULD_BYTESWAP(bp)); 3675b24ab676SJeff Bonwick ASSERT3U(zio->io_prop.zp_copies, <=, BP_GET_NDVAS(bp)); 3676e14bb325SJeff Bonwick ASSERT(BP_COUNT_GANG(bp) == 0 || 3677e14bb325SJeff Bonwick (BP_COUNT_GANG(bp) == BP_GET_NDVAS(bp))); 3678e14bb325SJeff Bonwick } 367980901aeaSGeorge Wilson if (zio->io_flags & ZIO_FLAG_NOPWRITE) 368080901aeaSGeorge Wilson VERIFY(BP_EQUAL(bp, &zio->io_bp_orig)); 3681e14bb325SJeff Bonwick } 3682fa9e4066Sahrens 3683e14bb325SJeff Bonwick /* 3684b24ab676SJeff Bonwick * If there were child vdev/gang/ddt errors, they apply to us now. 3685e14bb325SJeff Bonwick */ 3686e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_VDEV); 3687e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_GANG); 3688b24ab676SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_DDT); 3689b24ab676SJeff Bonwick 3690b24ab676SJeff Bonwick /* 3691b24ab676SJeff Bonwick * If the I/O on the transformed data was successful, generate any 3692b24ab676SJeff Bonwick * checksum reports now while we still have the transformed data. 3693b24ab676SJeff Bonwick */ 3694b24ab676SJeff Bonwick if (zio->io_error == 0) { 3695b24ab676SJeff Bonwick while (zio->io_cksum_report != NULL) { 3696b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 3697b24ab676SJeff Bonwick uint64_t align = zcr->zcr_align; 3698b24ab676SJeff Bonwick uint64_t asize = P2ROUNDUP(psize, align); 3699770499e1SDan Kimmel char *abuf = NULL; 3700770499e1SDan Kimmel abd_t *adata = zio->io_abd; 3701b24ab676SJeff Bonwick 3702b24ab676SJeff Bonwick if (asize != psize) { 3703770499e1SDan Kimmel adata = abd_alloc_linear(asize, B_TRUE); 3704770499e1SDan Kimmel abd_copy(adata, zio->io_abd, psize); 3705770499e1SDan Kimmel abd_zero_off(adata, psize, asize - psize); 3706b24ab676SJeff Bonwick } 3707b24ab676SJeff Bonwick 3708770499e1SDan Kimmel if (adata != NULL) 3709770499e1SDan Kimmel abuf = abd_borrow_buf_copy(adata, asize); 3710770499e1SDan Kimmel 3711b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 3712b24ab676SJeff Bonwick zcr->zcr_next = NULL; 3713b24ab676SJeff Bonwick zcr->zcr_finish(zcr, abuf); 3714b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 3715b24ab676SJeff Bonwick 3716770499e1SDan Kimmel if (adata != NULL) 3717770499e1SDan Kimmel abd_return_buf(adata, abuf, asize); 3718770499e1SDan Kimmel 3719b24ab676SJeff Bonwick if (asize != psize) 3720770499e1SDan Kimmel abd_free(adata); 3721b24ab676SJeff Bonwick } 3722b24ab676SJeff Bonwick } 3723e14bb325SJeff Bonwick 3724e14bb325SJeff Bonwick zio_pop_transforms(zio); /* note: may set zio->io_error */ 3725e14bb325SJeff Bonwick 3726e14bb325SJeff Bonwick vdev_stat_update(zio, psize); 3727e14bb325SJeff Bonwick 3728e14bb325SJeff Bonwick if (zio->io_error) { 3729e14bb325SJeff Bonwick /* 3730e14bb325SJeff Bonwick * If this I/O is attached to a particular vdev, 3731e14bb325SJeff Bonwick * generate an error message describing the I/O failure 3732e14bb325SJeff Bonwick * at the block level. We ignore these errors if the 3733e14bb325SJeff Bonwick * device is currently unavailable. 3734e14bb325SJeff Bonwick */ 3735e14bb325SJeff Bonwick if (zio->io_error != ECKSUM && vd != NULL && !vdev_is_dead(vd)) 3736e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_IO, spa, vd, zio, 0, 0); 3737e14bb325SJeff Bonwick 37388f18d1faSGeorge Wilson if ((zio->io_error == EIO || !(zio->io_flags & 37398f18d1faSGeorge Wilson (ZIO_FLAG_SPECULATIVE | ZIO_FLAG_DONT_PROPAGATE))) && 37408f18d1faSGeorge Wilson zio == lio) { 3741e14bb325SJeff Bonwick /* 3742e14bb325SJeff Bonwick * For logical I/O requests, tell the SPA to log the 3743e14bb325SJeff Bonwick * error and generate a logical data ereport. 3744e14bb325SJeff Bonwick */ 3745e14bb325SJeff Bonwick spa_log_error(spa, zio); 3746e14bb325SJeff Bonwick zfs_ereport_post(FM_EREPORT_ZFS_DATA, spa, NULL, zio, 3747e14bb325SJeff Bonwick 0, 0); 3748e14bb325SJeff Bonwick } 3749e14bb325SJeff Bonwick } 3750fa9e4066Sahrens 3751e14bb325SJeff Bonwick if (zio->io_error && zio == lio) { 3752e14bb325SJeff Bonwick /* 3753e14bb325SJeff Bonwick * Determine whether zio should be reexecuted. This will 3754e14bb325SJeff Bonwick * propagate all the way to the root via zio_notify_parent(). 3755e14bb325SJeff Bonwick */ 3756e14bb325SJeff Bonwick ASSERT(vd == NULL && bp != NULL); 3757b24ab676SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 3758e14bb325SJeff Bonwick 3759b24ab676SJeff Bonwick if (IO_IS_ALLOCATING(zio) && 3760b24ab676SJeff Bonwick !(zio->io_flags & ZIO_FLAG_CANFAIL)) { 3761e14bb325SJeff Bonwick if (zio->io_error != ENOSPC) 3762e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_NOW; 3763e14bb325SJeff Bonwick else 3764e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 3765b24ab676SJeff Bonwick } 3766e14bb325SJeff Bonwick 3767e14bb325SJeff Bonwick if ((zio->io_type == ZIO_TYPE_READ || 3768e14bb325SJeff Bonwick zio->io_type == ZIO_TYPE_FREE) && 376944ecc532SGeorge Wilson !(zio->io_flags & ZIO_FLAG_SCAN_THREAD) && 3770e14bb325SJeff Bonwick zio->io_error == ENXIO && 3771b16da2e2SGeorge Wilson spa_load_state(spa) == SPA_LOAD_NONE && 3772e14bb325SJeff Bonwick spa_get_failmode(spa) != ZIO_FAILURE_MODE_CONTINUE) 3773e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 3774e14bb325SJeff Bonwick 3775e14bb325SJeff Bonwick if (!(zio->io_flags & ZIO_FLAG_CANFAIL) && !zio->io_reexecute) 3776e14bb325SJeff Bonwick zio->io_reexecute |= ZIO_REEXECUTE_SUSPEND; 377722fe2c88SJonathan Adams 377822fe2c88SJonathan Adams /* 377922fe2c88SJonathan Adams * Here is a possibly good place to attempt to do 378022fe2c88SJonathan Adams * either combinatorial reconstruction or error correction 378122fe2c88SJonathan Adams * based on checksums. It also might be a good place 378222fe2c88SJonathan Adams * to send out preliminary ereports before we suspend 378322fe2c88SJonathan Adams * processing. 378422fe2c88SJonathan Adams */ 3785d63d470bSgw } 3786d63d470bSgw 378767bd71c6Sperrin /* 3788e14bb325SJeff Bonwick * If there were logical child errors, they apply to us now. 3789e14bb325SJeff Bonwick * We defer this until now to avoid conflating logical child 3790e14bb325SJeff Bonwick * errors with errors that happened to the zio itself when 3791e14bb325SJeff Bonwick * updating vdev stats and reporting FMA events above. 379267bd71c6Sperrin */ 3793e14bb325SJeff Bonwick zio_inherit_child_errors(zio, ZIO_CHILD_LOGICAL); 37948654d025Sperrin 3795b24ab676SJeff Bonwick if ((zio->io_error || zio->io_reexecute) && 3796b24ab676SJeff Bonwick IO_IS_ALLOCATING(zio) && zio->io_gang_leader == zio && 379780901aeaSGeorge Wilson !(zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE))) 3798f5383399SBill Moore zio_dva_unallocate(zio, zio->io_gang_tree, bp); 3799f5383399SBill Moore 3800f5383399SBill Moore zio_gang_tree_free(&zio->io_gang_tree); 3801f5383399SBill Moore 380233a372edSGeorge Wilson /* 380333a372edSGeorge Wilson * Godfather I/Os should never suspend. 380433a372edSGeorge Wilson */ 380533a372edSGeorge Wilson if ((zio->io_flags & ZIO_FLAG_GODFATHER) && 380633a372edSGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) 380733a372edSGeorge Wilson zio->io_reexecute = 0; 380833a372edSGeorge Wilson 380933a372edSGeorge Wilson if (zio->io_reexecute) { 3810e14bb325SJeff Bonwick /* 3811e14bb325SJeff Bonwick * This is a logical I/O that wants to reexecute. 3812e14bb325SJeff Bonwick * 3813e14bb325SJeff Bonwick * Reexecute is top-down. When an i/o fails, if it's not 3814e14bb325SJeff Bonwick * the root, it simply notifies its parent and sticks around. 3815e14bb325SJeff Bonwick * The parent, seeing that it still has children in zio_done(), 3816e14bb325SJeff Bonwick * does the same. This percolates all the way up to the root. 3817e14bb325SJeff Bonwick * The root i/o will reexecute or suspend the entire tree. 3818e14bb325SJeff Bonwick * 3819e14bb325SJeff Bonwick * This approach ensures that zio_reexecute() honors 3820e14bb325SJeff Bonwick * all the original i/o dependency relationships, e.g. 3821e14bb325SJeff Bonwick * parents not executing until children are ready. 3822e14bb325SJeff Bonwick */ 3823e14bb325SJeff Bonwick ASSERT(zio->io_child_type == ZIO_CHILD_LOGICAL); 3824fa9e4066Sahrens 3825f5383399SBill Moore zio->io_gang_leader = NULL; 3826e14bb325SJeff Bonwick 3827a3f829aeSBill Moore mutex_enter(&zio->io_lock); 3828a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 3829a3f829aeSBill Moore mutex_exit(&zio->io_lock); 3830a3f829aeSBill Moore 383154d692b7SGeorge Wilson /* 383254d692b7SGeorge Wilson * "The Godfather" I/O monitors its children but is 383354d692b7SGeorge Wilson * not a true parent to them. It will track them through 383454d692b7SGeorge Wilson * the pipeline but severs its ties whenever they get into 383554d692b7SGeorge Wilson * trouble (e.g. suspended). This allows "The Godfather" 383654d692b7SGeorge Wilson * I/O to return status without blocking. 383754d692b7SGeorge Wilson */ 38380f7643c7SGeorge Wilson zl = NULL; 38390f7643c7SGeorge Wilson for (pio = zio_walk_parents(zio, &zl); pio != NULL; 38400f7643c7SGeorge Wilson pio = pio_next) { 38410f7643c7SGeorge Wilson zio_link_t *remove_zl = zl; 38420f7643c7SGeorge Wilson pio_next = zio_walk_parents(zio, &zl); 384354d692b7SGeorge Wilson 384454d692b7SGeorge Wilson if ((pio->io_flags & ZIO_FLAG_GODFATHER) && 384554d692b7SGeorge Wilson (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND)) { 38460f7643c7SGeorge Wilson zio_remove_child(pio, zio, remove_zl); 384754d692b7SGeorge Wilson zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 384854d692b7SGeorge Wilson } 384954d692b7SGeorge Wilson } 385054d692b7SGeorge Wilson 3851a3f829aeSBill Moore if ((pio = zio_unique_parent(zio)) != NULL) { 3852e14bb325SJeff Bonwick /* 3853e14bb325SJeff Bonwick * We're not a root i/o, so there's nothing to do 3854e14bb325SJeff Bonwick * but notify our parent. Don't propagate errors 3855e14bb325SJeff Bonwick * upward since we haven't permanently failed yet. 3856e14bb325SJeff Bonwick */ 385733a372edSGeorge Wilson ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER)); 3858e14bb325SJeff Bonwick zio->io_flags |= ZIO_FLAG_DONT_PROPAGATE; 3859e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 3860e14bb325SJeff Bonwick } else if (zio->io_reexecute & ZIO_REEXECUTE_SUSPEND) { 3861e14bb325SJeff Bonwick /* 3862e14bb325SJeff Bonwick * We'd fail again if we reexecuted now, so suspend 3863e14bb325SJeff Bonwick * until conditions improve (e.g. device comes online). 3864e14bb325SJeff Bonwick */ 3865e14bb325SJeff Bonwick zio_suspend(spa, zio); 3866e14bb325SJeff Bonwick } else { 3867e14bb325SJeff Bonwick /* 3868e14bb325SJeff Bonwick * Reexecution is potentially a huge amount of work. 3869e14bb325SJeff Bonwick * Hand it off to the otherwise-unused claim taskq. 3870e14bb325SJeff Bonwick */ 38715aeb9474SGarrett D'Amore ASSERT(zio->io_tqent.tqent_next == NULL); 3872ec94d322SAdam Leventhal spa_taskq_dispatch_ent(spa, ZIO_TYPE_CLAIM, 3873ec94d322SAdam Leventhal ZIO_TASKQ_ISSUE, (task_func_t *)zio_reexecute, zio, 3874ec94d322SAdam Leventhal 0, &zio->io_tqent); 3875e14bb325SJeff Bonwick } 3876e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3877fa9e4066Sahrens } 3878fa9e4066Sahrens 3879b24ab676SJeff Bonwick ASSERT(zio->io_child_count == 0); 388033a372edSGeorge Wilson ASSERT(zio->io_reexecute == 0); 3881e14bb325SJeff Bonwick ASSERT(zio->io_error == 0 || (zio->io_flags & ZIO_FLAG_CANFAIL)); 3882fa9e4066Sahrens 3883b24ab676SJeff Bonwick /* 3884b24ab676SJeff Bonwick * Report any checksum errors, since the I/O is complete. 3885b24ab676SJeff Bonwick */ 388622fe2c88SJonathan Adams while (zio->io_cksum_report != NULL) { 3887b24ab676SJeff Bonwick zio_cksum_report_t *zcr = zio->io_cksum_report; 3888b24ab676SJeff Bonwick zio->io_cksum_report = zcr->zcr_next; 3889b24ab676SJeff Bonwick zcr->zcr_next = NULL; 3890b24ab676SJeff Bonwick zcr->zcr_finish(zcr, NULL); 3891b24ab676SJeff Bonwick zfs_ereport_free_checksum(zcr); 389222fe2c88SJonathan Adams } 389322fe2c88SJonathan Adams 3894a3f829aeSBill Moore /* 3895a3f829aeSBill Moore * It is the responsibility of the done callback to ensure that this 3896a3f829aeSBill Moore * particular zio is no longer discoverable for adoption, and as 3897a3f829aeSBill Moore * such, cannot acquire any new parents. 3898a3f829aeSBill Moore */ 3899e14bb325SJeff Bonwick if (zio->io_done) 3900e14bb325SJeff Bonwick zio->io_done(zio); 3901fa9e4066Sahrens 3902a3f829aeSBill Moore mutex_enter(&zio->io_lock); 3903a3f829aeSBill Moore zio->io_state[ZIO_WAIT_DONE] = 1; 3904a3f829aeSBill Moore mutex_exit(&zio->io_lock); 3905fa9e4066Sahrens 39060f7643c7SGeorge Wilson zl = NULL; 39070f7643c7SGeorge Wilson for (pio = zio_walk_parents(zio, &zl); pio != NULL; pio = pio_next) { 39080f7643c7SGeorge Wilson zio_link_t *remove_zl = zl; 39090f7643c7SGeorge Wilson pio_next = zio_walk_parents(zio, &zl); 39100f7643c7SGeorge Wilson zio_remove_child(pio, zio, remove_zl); 3911e14bb325SJeff Bonwick zio_notify_parent(pio, zio, ZIO_WAIT_DONE); 3912e14bb325SJeff Bonwick } 3913fa9e4066Sahrens 3914e14bb325SJeff Bonwick if (zio->io_waiter != NULL) { 3915e14bb325SJeff Bonwick mutex_enter(&zio->io_lock); 3916e14bb325SJeff Bonwick zio->io_executor = NULL; 3917e14bb325SJeff Bonwick cv_broadcast(&zio->io_cv); 3918e14bb325SJeff Bonwick mutex_exit(&zio->io_lock); 3919e14bb325SJeff Bonwick } else { 3920e14bb325SJeff Bonwick zio_destroy(zio); 3921e14bb325SJeff Bonwick } 3922fa9e4066Sahrens 3923e14bb325SJeff Bonwick return (ZIO_PIPELINE_STOP); 3924fa9e4066Sahrens } 392546341222Sperrin 392646341222Sperrin /* 3927e14bb325SJeff Bonwick * ========================================================================== 3928e14bb325SJeff Bonwick * I/O pipeline definition 3929e14bb325SJeff Bonwick * ========================================================================== 393046341222Sperrin */ 3931b24ab676SJeff Bonwick static zio_pipe_stage_t *zio_pipeline[] = { 3932e14bb325SJeff Bonwick NULL, 3933e14bb325SJeff Bonwick zio_read_bp_init, 39340f7643c7SGeorge Wilson zio_write_bp_init, 3935b24ab676SJeff Bonwick zio_free_bp_init, 3936b24ab676SJeff Bonwick zio_issue_async, 39370f7643c7SGeorge Wilson zio_write_compress, 3938e14bb325SJeff Bonwick zio_checksum_generate, 393980901aeaSGeorge Wilson zio_nop_write, 3940b24ab676SJeff Bonwick zio_ddt_read_start, 3941b24ab676SJeff Bonwick zio_ddt_read_done, 3942b24ab676SJeff Bonwick zio_ddt_write, 3943b24ab676SJeff Bonwick zio_ddt_free, 3944e14bb325SJeff Bonwick zio_gang_assemble, 3945e14bb325SJeff Bonwick zio_gang_issue, 39460f7643c7SGeorge Wilson zio_dva_throttle, 3947e14bb325SJeff Bonwick zio_dva_allocate, 3948e14bb325SJeff Bonwick zio_dva_free, 3949e14bb325SJeff Bonwick zio_dva_claim, 3950e14bb325SJeff Bonwick zio_ready, 3951e14bb325SJeff Bonwick zio_vdev_io_start, 3952e14bb325SJeff Bonwick zio_vdev_io_done, 3953e14bb325SJeff Bonwick zio_vdev_io_assess, 3954e14bb325SJeff Bonwick zio_checksum_verify, 3955e14bb325SJeff Bonwick zio_done 3956e14bb325SJeff Bonwick }; 3957ad135b5dSChristopher Siden 3958ad135b5dSChristopher Siden 3959ad135b5dSChristopher Siden 3960ad135b5dSChristopher Siden 3961a2cdcdd2SPaul Dagnelie /* 3962a2cdcdd2SPaul Dagnelie * Compare two zbookmark_phys_t's to see which we would reach first in a 3963a2cdcdd2SPaul Dagnelie * pre-order traversal of the object tree. 3964a2cdcdd2SPaul Dagnelie * 3965a2cdcdd2SPaul Dagnelie * This is simple in every case aside from the meta-dnode object. For all other 3966a2cdcdd2SPaul Dagnelie * objects, we traverse them in order (object 1 before object 2, and so on). 3967a2cdcdd2SPaul Dagnelie * However, all of these objects are traversed while traversing object 0, since 3968a2cdcdd2SPaul Dagnelie * the data it points to is the list of objects. Thus, we need to convert to a 3969a2cdcdd2SPaul Dagnelie * canonical representation so we can compare meta-dnode bookmarks to 3970a2cdcdd2SPaul Dagnelie * non-meta-dnode bookmarks. 3971a2cdcdd2SPaul Dagnelie * 3972a2cdcdd2SPaul Dagnelie * We do this by calculating "equivalents" for each field of the zbookmark. 3973a2cdcdd2SPaul Dagnelie * zbookmarks outside of the meta-dnode use their own object and level, and 3974a2cdcdd2SPaul Dagnelie * calculate the level 0 equivalent (the first L0 blkid that is contained in the 3975a2cdcdd2SPaul Dagnelie * blocks this bookmark refers to) by multiplying their blkid by their span 3976a2cdcdd2SPaul Dagnelie * (the number of L0 blocks contained within one block at their level). 3977a2cdcdd2SPaul Dagnelie * zbookmarks inside the meta-dnode calculate their object equivalent 3978a2cdcdd2SPaul Dagnelie * (which is L0equiv * dnodes per data block), use 0 for their L0equiv, and use 3979a2cdcdd2SPaul Dagnelie * level + 1<<31 (any value larger than a level could ever be) for their level. 3980a2cdcdd2SPaul Dagnelie * This causes them to always compare before a bookmark in their object 3981a2cdcdd2SPaul Dagnelie * equivalent, compare appropriately to bookmarks in other objects, and to 3982a2cdcdd2SPaul Dagnelie * compare appropriately to other bookmarks in the meta-dnode. 3983a2cdcdd2SPaul Dagnelie */ 3984a2cdcdd2SPaul Dagnelie int 3985a2cdcdd2SPaul Dagnelie zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, uint8_t ibs2, 3986a2cdcdd2SPaul Dagnelie const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2) 3987a2cdcdd2SPaul Dagnelie { 3988a2cdcdd2SPaul Dagnelie /* 3989a2cdcdd2SPaul Dagnelie * These variables represent the "equivalent" values for the zbookmark, 3990a2cdcdd2SPaul Dagnelie * after converting zbookmarks inside the meta dnode to their 3991a2cdcdd2SPaul Dagnelie * normal-object equivalents. 3992a2cdcdd2SPaul Dagnelie */ 3993a2cdcdd2SPaul Dagnelie uint64_t zb1obj, zb2obj; 3994a2cdcdd2SPaul Dagnelie uint64_t zb1L0, zb2L0; 3995a2cdcdd2SPaul Dagnelie uint64_t zb1level, zb2level; 3996ad135b5dSChristopher Siden 3997a2cdcdd2SPaul Dagnelie if (zb1->zb_object == zb2->zb_object && 3998a2cdcdd2SPaul Dagnelie zb1->zb_level == zb2->zb_level && 3999a2cdcdd2SPaul Dagnelie zb1->zb_blkid == zb2->zb_blkid) 4000a2cdcdd2SPaul Dagnelie return (0); 4001a2cdcdd2SPaul Dagnelie 4002a2cdcdd2SPaul Dagnelie /* 4003a2cdcdd2SPaul Dagnelie * BP_SPANB calculates the span in blocks. 4004a2cdcdd2SPaul Dagnelie */ 4005a2cdcdd2SPaul Dagnelie zb1L0 = (zb1->zb_blkid) * BP_SPANB(ibs1, zb1->zb_level); 4006a2cdcdd2SPaul Dagnelie zb2L0 = (zb2->zb_blkid) * BP_SPANB(ibs2, zb2->zb_level); 4007ad135b5dSChristopher Siden 4008ad135b5dSChristopher Siden if (zb1->zb_object == DMU_META_DNODE_OBJECT) { 4009a2cdcdd2SPaul Dagnelie zb1obj = zb1L0 * (dbss1 << (SPA_MINBLOCKSHIFT - DNODE_SHIFT)); 4010a2cdcdd2SPaul Dagnelie zb1L0 = 0; 4011a2cdcdd2SPaul Dagnelie zb1level = zb1->zb_level + COMPARE_META_LEVEL; 4012a2cdcdd2SPaul Dagnelie } else { 4013a2cdcdd2SPaul Dagnelie zb1obj = zb1->zb_object; 4014a2cdcdd2SPaul Dagnelie zb1level = zb1->zb_level; 4015ad135b5dSChristopher Siden } 4016ad135b5dSChristopher Siden 4017a2cdcdd2SPaul Dagnelie if (zb2->zb_object == DMU_META_DNODE_OBJECT) { 4018a2cdcdd2SPaul Dagnelie zb2obj = zb2L0 * (dbss2 << (SPA_MINBLOCKSHIFT - DNODE_SHIFT)); 4019a2cdcdd2SPaul Dagnelie zb2L0 = 0; 4020a2cdcdd2SPaul Dagnelie zb2level = zb2->zb_level + COMPARE_META_LEVEL; 4021a2cdcdd2SPaul Dagnelie } else { 4022a2cdcdd2SPaul Dagnelie zb2obj = zb2->zb_object; 4023a2cdcdd2SPaul Dagnelie zb2level = zb2->zb_level; 4024a2cdcdd2SPaul Dagnelie } 4025a2cdcdd2SPaul Dagnelie 4026a2cdcdd2SPaul Dagnelie /* Now that we have a canonical representation, do the comparison. */ 4027a2cdcdd2SPaul Dagnelie if (zb1obj != zb2obj) 4028a2cdcdd2SPaul Dagnelie return (zb1obj < zb2obj ? -1 : 1); 4029a2cdcdd2SPaul Dagnelie else if (zb1L0 != zb2L0) 4030a2cdcdd2SPaul Dagnelie return (zb1L0 < zb2L0 ? -1 : 1); 4031a2cdcdd2SPaul Dagnelie else if (zb1level != zb2level) 4032a2cdcdd2SPaul Dagnelie return (zb1level > zb2level ? -1 : 1); 4033a2cdcdd2SPaul Dagnelie /* 4034a2cdcdd2SPaul Dagnelie * This can (theoretically) happen if the bookmarks have the same object 4035a2cdcdd2SPaul Dagnelie * and level, but different blkids, if the block sizes are not the same. 4036a2cdcdd2SPaul Dagnelie * There is presently no way to change the indirect block sizes 4037a2cdcdd2SPaul Dagnelie */ 4038a2cdcdd2SPaul Dagnelie return (0); 4039a2cdcdd2SPaul Dagnelie } 4040a2cdcdd2SPaul Dagnelie 4041a2cdcdd2SPaul Dagnelie /* 4042a2cdcdd2SPaul Dagnelie * This function checks the following: given that last_block is the place that 4043a2cdcdd2SPaul Dagnelie * our traversal stopped last time, does that guarantee that we've visited 4044a2cdcdd2SPaul Dagnelie * every node under subtree_root? Therefore, we can't just use the raw output 4045a2cdcdd2SPaul Dagnelie * of zbookmark_compare. We have to pass in a modified version of 4046a2cdcdd2SPaul Dagnelie * subtree_root; by incrementing the block id, and then checking whether 4047a2cdcdd2SPaul Dagnelie * last_block is before or equal to that, we can tell whether or not having 4048a2cdcdd2SPaul Dagnelie * visited last_block implies that all of subtree_root's children have been 4049a2cdcdd2SPaul Dagnelie * visited. 4050a2cdcdd2SPaul Dagnelie */ 4051a2cdcdd2SPaul Dagnelie boolean_t 4052a2cdcdd2SPaul Dagnelie zbookmark_subtree_completed(const dnode_phys_t *dnp, 4053a2cdcdd2SPaul Dagnelie const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block) 4054a2cdcdd2SPaul Dagnelie { 4055a2cdcdd2SPaul Dagnelie zbookmark_phys_t mod_zb = *subtree_root; 4056a2cdcdd2SPaul Dagnelie mod_zb.zb_blkid++; 4057a2cdcdd2SPaul Dagnelie ASSERT(last_block->zb_level == 0); 4058a2cdcdd2SPaul Dagnelie 4059a2cdcdd2SPaul Dagnelie /* The objset_phys_t isn't before anything. */ 4060a2cdcdd2SPaul Dagnelie if (dnp == NULL) 4061ad135b5dSChristopher Siden return (B_FALSE); 4062a2cdcdd2SPaul Dagnelie 4063a2cdcdd2SPaul Dagnelie /* 4064a2cdcdd2SPaul Dagnelie * We pass in 1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT) for the 4065a2cdcdd2SPaul Dagnelie * data block size in sectors, because that variable is only used if 4066a2cdcdd2SPaul Dagnelie * the bookmark refers to a block in the meta-dnode. Since we don't 4067a2cdcdd2SPaul Dagnelie * know without examining it what object it refers to, and there's no 4068a2cdcdd2SPaul Dagnelie * harm in passing in this value in other cases, we always pass it in. 4069a2cdcdd2SPaul Dagnelie * 4070a2cdcdd2SPaul Dagnelie * We pass in 0 for the indirect block size shift because zb2 must be 4071a2cdcdd2SPaul Dagnelie * level 0. The indirect block size is only used to calculate the span 4072a2cdcdd2SPaul Dagnelie * of the bookmark, but since the bookmark must be level 0, the span is 4073a2cdcdd2SPaul Dagnelie * always 1, so the math works out. 4074a2cdcdd2SPaul Dagnelie * 4075a2cdcdd2SPaul Dagnelie * If you make changes to how the zbookmark_compare code works, be sure 4076a2cdcdd2SPaul Dagnelie * to make sure that this code still works afterwards. 4077a2cdcdd2SPaul Dagnelie */ 4078a2cdcdd2SPaul Dagnelie return (zbookmark_compare(dnp->dn_datablkszsec, dnp->dn_indblkshift, 4079a2cdcdd2SPaul Dagnelie 1ULL << (DNODE_BLOCK_SHIFT - SPA_MINBLOCKSHIFT), 0, &mod_zb, 4080a2cdcdd2SPaul Dagnelie last_block) <= 0); 4081ad135b5dSChristopher Siden } 4082