1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5fe9cf88cSperrin * Common Development and Distribution License (the "License"). 6fe9cf88cSperrin * 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 /* 2213f5297eSperrin * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 27fa9e4066Sahrens 28fa9e4066Sahrens #include <sys/zfs_context.h> 29fa9e4066Sahrens #include <sys/spa.h> 30fa9e4066Sahrens #include <sys/dmu.h> 31fa9e4066Sahrens #include <sys/zap.h> 32fa9e4066Sahrens #include <sys/arc.h> 33fa9e4066Sahrens #include <sys/stat.h> 34fa9e4066Sahrens #include <sys/resource.h> 35fa9e4066Sahrens #include <sys/zil.h> 36fa9e4066Sahrens #include <sys/zil_impl.h> 37fa9e4066Sahrens #include <sys/dsl_dataset.h> 38fa9e4066Sahrens #include <sys/vdev.h> 39fa9e4066Sahrens 40fa9e4066Sahrens /* 41fa9e4066Sahrens * The zfs intent log (ZIL) saves transaction records of system calls 42fa9e4066Sahrens * that change the file system in memory with enough information 43fa9e4066Sahrens * to be able to replay them. These are stored in memory until 44fa9e4066Sahrens * either the DMU transaction group (txg) commits them to the stable pool 45fa9e4066Sahrens * and they can be discarded, or they are flushed to the stable log 46fa9e4066Sahrens * (also in the pool) due to a fsync, O_DSYNC or other synchronous 47fa9e4066Sahrens * requirement. In the event of a panic or power fail then those log 48fa9e4066Sahrens * records (transactions) are replayed. 49fa9e4066Sahrens * 50fa9e4066Sahrens * There is one ZIL per file system. Its on-disk (pool) format consists 51fa9e4066Sahrens * of 3 parts: 52fa9e4066Sahrens * 53fa9e4066Sahrens * - ZIL header 54fa9e4066Sahrens * - ZIL blocks 55fa9e4066Sahrens * - ZIL records 56fa9e4066Sahrens * 57fa9e4066Sahrens * A log record holds a system call transaction. Log blocks can 58fa9e4066Sahrens * hold many log records and the blocks are chained together. 59fa9e4066Sahrens * Each ZIL block contains a block pointer (blkptr_t) to the next 60fa9e4066Sahrens * ZIL block in the chain. The ZIL header points to the first 61fa9e4066Sahrens * block in the chain. Note there is not a fixed place in the pool 62fa9e4066Sahrens * to hold blocks. They are dynamically allocated and freed as 63fa9e4066Sahrens * needed from the blocks available. Figure X shows the ZIL structure: 64fa9e4066Sahrens */ 65fa9e4066Sahrens 66fa9e4066Sahrens /* 67fa9e4066Sahrens * These global ZIL switches affect all pools 68fa9e4066Sahrens */ 69fa9e4066Sahrens int zil_disable = 0; /* disable intent logging */ 70fa9e4066Sahrens int zil_always = 0; /* make every transaction synchronous */ 71fa9e4066Sahrens int zil_purge = 0; /* at pool open, just throw everything away */ 72fa9e4066Sahrens int zil_noflush = 0; /* don't flush write cache buffers on disks */ 73fa9e4066Sahrens 74fa9e4066Sahrens static kmem_cache_t *zil_lwb_cache; 75fa9e4066Sahrens 76fa9e4066Sahrens static int 77fa9e4066Sahrens zil_dva_compare(const void *x1, const void *x2) 78fa9e4066Sahrens { 79fa9e4066Sahrens const dva_t *dva1 = x1; 80fa9e4066Sahrens const dva_t *dva2 = x2; 81fa9e4066Sahrens 82fa9e4066Sahrens if (DVA_GET_VDEV(dva1) < DVA_GET_VDEV(dva2)) 83fa9e4066Sahrens return (-1); 84fa9e4066Sahrens if (DVA_GET_VDEV(dva1) > DVA_GET_VDEV(dva2)) 85fa9e4066Sahrens return (1); 86fa9e4066Sahrens 87fa9e4066Sahrens if (DVA_GET_OFFSET(dva1) < DVA_GET_OFFSET(dva2)) 88fa9e4066Sahrens return (-1); 89fa9e4066Sahrens if (DVA_GET_OFFSET(dva1) > DVA_GET_OFFSET(dva2)) 90fa9e4066Sahrens return (1); 91fa9e4066Sahrens 92fa9e4066Sahrens return (0); 93fa9e4066Sahrens } 94fa9e4066Sahrens 95fa9e4066Sahrens static void 96fa9e4066Sahrens zil_dva_tree_init(avl_tree_t *t) 97fa9e4066Sahrens { 98fa9e4066Sahrens avl_create(t, zil_dva_compare, sizeof (zil_dva_node_t), 99fa9e4066Sahrens offsetof(zil_dva_node_t, zn_node)); 100fa9e4066Sahrens } 101fa9e4066Sahrens 102fa9e4066Sahrens static void 103fa9e4066Sahrens zil_dva_tree_fini(avl_tree_t *t) 104fa9e4066Sahrens { 105fa9e4066Sahrens zil_dva_node_t *zn; 106fa9e4066Sahrens void *cookie = NULL; 107fa9e4066Sahrens 108fa9e4066Sahrens while ((zn = avl_destroy_nodes(t, &cookie)) != NULL) 109fa9e4066Sahrens kmem_free(zn, sizeof (zil_dva_node_t)); 110fa9e4066Sahrens 111fa9e4066Sahrens avl_destroy(t); 112fa9e4066Sahrens } 113fa9e4066Sahrens 114fa9e4066Sahrens static int 115fa9e4066Sahrens zil_dva_tree_add(avl_tree_t *t, dva_t *dva) 116fa9e4066Sahrens { 117fa9e4066Sahrens zil_dva_node_t *zn; 118fa9e4066Sahrens avl_index_t where; 119fa9e4066Sahrens 120fa9e4066Sahrens if (avl_find(t, dva, &where) != NULL) 121fa9e4066Sahrens return (EEXIST); 122fa9e4066Sahrens 123fa9e4066Sahrens zn = kmem_alloc(sizeof (zil_dva_node_t), KM_SLEEP); 124fa9e4066Sahrens zn->zn_dva = *dva; 125fa9e4066Sahrens avl_insert(t, zn, where); 126fa9e4066Sahrens 127fa9e4066Sahrens return (0); 128fa9e4066Sahrens } 129fa9e4066Sahrens 130d80c45e0Sbonwick static zil_header_t * 131d80c45e0Sbonwick zil_header_in_syncing_context(zilog_t *zilog) 132d80c45e0Sbonwick { 133d80c45e0Sbonwick return ((zil_header_t *)zilog->zl_header); 134d80c45e0Sbonwick } 135d80c45e0Sbonwick 136d80c45e0Sbonwick static void 137d80c45e0Sbonwick zil_init_log_chain(zilog_t *zilog, blkptr_t *bp) 138d80c45e0Sbonwick { 139d80c45e0Sbonwick zio_cksum_t *zc = &bp->blk_cksum; 140d80c45e0Sbonwick 141d80c45e0Sbonwick zc->zc_word[ZIL_ZC_GUID_0] = spa_get_random(-1ULL); 142d80c45e0Sbonwick zc->zc_word[ZIL_ZC_GUID_1] = spa_get_random(-1ULL); 143d80c45e0Sbonwick zc->zc_word[ZIL_ZC_OBJSET] = dmu_objset_id(zilog->zl_os); 144d80c45e0Sbonwick zc->zc_word[ZIL_ZC_SEQ] = 1ULL; 145d80c45e0Sbonwick } 146d80c45e0Sbonwick 147fa9e4066Sahrens /* 148fa9e4066Sahrens * Read a log block, make sure it's valid, and byteswap it if necessary. 149fa9e4066Sahrens */ 150fa9e4066Sahrens static int 151d80c45e0Sbonwick zil_read_log_block(zilog_t *zilog, const blkptr_t *bp, arc_buf_t **abufpp) 152fa9e4066Sahrens { 153d80c45e0Sbonwick blkptr_t blk = *bp; 154ea8dc4b6Seschrock zbookmark_t zb; 155fa9e4066Sahrens int error; 156fa9e4066Sahrens 157d80c45e0Sbonwick zb.zb_objset = bp->blk_cksum.zc_word[ZIL_ZC_OBJSET]; 158ea8dc4b6Seschrock zb.zb_object = 0; 159ea8dc4b6Seschrock zb.zb_level = -1; 160d80c45e0Sbonwick zb.zb_blkid = bp->blk_cksum.zc_word[ZIL_ZC_SEQ]; 161ea8dc4b6Seschrock 162d80c45e0Sbonwick *abufpp = NULL; 163fa9e4066Sahrens 164d80c45e0Sbonwick error = arc_read(NULL, zilog->zl_spa, &blk, byteswap_uint64_array, 165d80c45e0Sbonwick arc_getbuf_func, abufpp, ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL | 166d80c45e0Sbonwick ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB, ARC_WAIT, &zb); 167fa9e4066Sahrens 168d80c45e0Sbonwick if (error == 0) { 169d80c45e0Sbonwick char *data = (*abufpp)->b_data; 170d80c45e0Sbonwick uint64_t blksz = BP_GET_LSIZE(bp); 171d80c45e0Sbonwick zil_trailer_t *ztp = (zil_trailer_t *)(data + blksz) - 1; 172d80c45e0Sbonwick zio_cksum_t cksum = bp->blk_cksum; 173fa9e4066Sahrens 174d80c45e0Sbonwick /* 175d80c45e0Sbonwick * Sequence numbers should be... sequential. The checksum 176d80c45e0Sbonwick * verifier for the next block should be bp's checksum plus 1. 177d80c45e0Sbonwick */ 178d80c45e0Sbonwick cksum.zc_word[ZIL_ZC_SEQ]++; 179d80c45e0Sbonwick 180d80c45e0Sbonwick if (bcmp(&cksum, &ztp->zit_next_blk.blk_cksum, sizeof (cksum))) 181d80c45e0Sbonwick error = ESTALE; 182d80c45e0Sbonwick else if (BP_IS_HOLE(&ztp->zit_next_blk)) 183d80c45e0Sbonwick error = ENOENT; 184d80c45e0Sbonwick else if (ztp->zit_nused > (blksz - sizeof (zil_trailer_t))) 185d80c45e0Sbonwick error = EOVERFLOW; 186fa9e4066Sahrens 187d80c45e0Sbonwick if (error) { 188d80c45e0Sbonwick VERIFY(arc_buf_remove_ref(*abufpp, abufpp) == 1); 189d80c45e0Sbonwick *abufpp = NULL; 190d80c45e0Sbonwick } 191fa9e4066Sahrens } 192fa9e4066Sahrens 193d80c45e0Sbonwick dprintf("error %d on %llu:%llu\n", error, zb.zb_objset, zb.zb_blkid); 194fa9e4066Sahrens 195d80c45e0Sbonwick return (error); 196fa9e4066Sahrens } 197fa9e4066Sahrens 198fa9e4066Sahrens /* 199fa9e4066Sahrens * Parse the intent log, and call parse_func for each valid record within. 200d80c45e0Sbonwick * Return the highest sequence number. 201fa9e4066Sahrens */ 202d80c45e0Sbonwick uint64_t 203fa9e4066Sahrens zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func, 204fa9e4066Sahrens zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg) 205fa9e4066Sahrens { 206d80c45e0Sbonwick const zil_header_t *zh = zilog->zl_header; 207d80c45e0Sbonwick uint64_t claim_seq = zh->zh_claim_seq; 208d80c45e0Sbonwick uint64_t seq = 0; 209d80c45e0Sbonwick uint64_t max_seq = 0; 210d80c45e0Sbonwick blkptr_t blk = zh->zh_log; 211d80c45e0Sbonwick arc_buf_t *abuf; 212fa9e4066Sahrens char *lrbuf, *lrp; 213fa9e4066Sahrens zil_trailer_t *ztp; 214fa9e4066Sahrens int reclen, error; 215fa9e4066Sahrens 216fa9e4066Sahrens if (BP_IS_HOLE(&blk)) 217d80c45e0Sbonwick return (max_seq); 218fa9e4066Sahrens 219fa9e4066Sahrens /* 220fa9e4066Sahrens * Starting at the block pointed to by zh_log we read the log chain. 221fa9e4066Sahrens * For each block in the chain we strongly check that block to 222fa9e4066Sahrens * ensure its validity. We stop when an invalid block is found. 223fa9e4066Sahrens * For each block pointer in the chain we call parse_blk_func(). 224fa9e4066Sahrens * For each record in each valid block we call parse_lr_func(). 225d80c45e0Sbonwick * If the log has been claimed, stop if we encounter a sequence 226d80c45e0Sbonwick * number greater than the highest claimed sequence number. 227fa9e4066Sahrens */ 228fa9e4066Sahrens zil_dva_tree_init(&zilog->zl_dva_tree); 229fa9e4066Sahrens for (;;) { 230d80c45e0Sbonwick seq = blk.blk_cksum.zc_word[ZIL_ZC_SEQ]; 231d80c45e0Sbonwick 232d80c45e0Sbonwick if (claim_seq != 0 && seq > claim_seq) 233d80c45e0Sbonwick break; 234d80c45e0Sbonwick 235d80c45e0Sbonwick ASSERT(max_seq < seq); 236d80c45e0Sbonwick max_seq = seq; 237d80c45e0Sbonwick 238d80c45e0Sbonwick error = zil_read_log_block(zilog, &blk, &abuf); 239fa9e4066Sahrens 240fa9e4066Sahrens if (parse_blk_func != NULL) 241fa9e4066Sahrens parse_blk_func(zilog, &blk, arg, txg); 242fa9e4066Sahrens 243fa9e4066Sahrens if (error) 244fa9e4066Sahrens break; 245fa9e4066Sahrens 246d80c45e0Sbonwick lrbuf = abuf->b_data; 247fa9e4066Sahrens ztp = (zil_trailer_t *)(lrbuf + BP_GET_LSIZE(&blk)) - 1; 248fa9e4066Sahrens blk = ztp->zit_next_blk; 249fa9e4066Sahrens 250d80c45e0Sbonwick if (parse_lr_func == NULL) { 251d80c45e0Sbonwick VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 252fa9e4066Sahrens continue; 253d80c45e0Sbonwick } 254fa9e4066Sahrens 255fa9e4066Sahrens for (lrp = lrbuf; lrp < lrbuf + ztp->zit_nused; lrp += reclen) { 256fa9e4066Sahrens lr_t *lr = (lr_t *)lrp; 257fa9e4066Sahrens reclen = lr->lrc_reclen; 258fa9e4066Sahrens ASSERT3U(reclen, >=, sizeof (lr_t)); 259fa9e4066Sahrens parse_lr_func(zilog, lr, arg, txg); 260fa9e4066Sahrens } 261d80c45e0Sbonwick VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 262fa9e4066Sahrens } 263fa9e4066Sahrens zil_dva_tree_fini(&zilog->zl_dva_tree); 264d80c45e0Sbonwick 265d80c45e0Sbonwick return (max_seq); 266fa9e4066Sahrens } 267fa9e4066Sahrens 268fa9e4066Sahrens /* ARGSUSED */ 269fa9e4066Sahrens static void 270fa9e4066Sahrens zil_claim_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t first_txg) 271fa9e4066Sahrens { 272fa9e4066Sahrens spa_t *spa = zilog->zl_spa; 273fa9e4066Sahrens int err; 274fa9e4066Sahrens 275fa9e4066Sahrens /* 276fa9e4066Sahrens * Claim log block if not already committed and not already claimed. 277fa9e4066Sahrens */ 278fa9e4066Sahrens if (bp->blk_birth >= first_txg && 279fa9e4066Sahrens zil_dva_tree_add(&zilog->zl_dva_tree, BP_IDENTITY(bp)) == 0) { 280fa9e4066Sahrens err = zio_wait(zio_claim(NULL, spa, first_txg, bp, NULL, NULL)); 281fa9e4066Sahrens ASSERT(err == 0); 282fa9e4066Sahrens } 283fa9e4066Sahrens } 284fa9e4066Sahrens 285fa9e4066Sahrens static void 286fa9e4066Sahrens zil_claim_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t first_txg) 287fa9e4066Sahrens { 288fa9e4066Sahrens if (lrc->lrc_txtype == TX_WRITE) { 289fa9e4066Sahrens lr_write_t *lr = (lr_write_t *)lrc; 290fa9e4066Sahrens zil_claim_log_block(zilog, &lr->lr_blkptr, tx, first_txg); 291fa9e4066Sahrens } 292fa9e4066Sahrens } 293fa9e4066Sahrens 294fa9e4066Sahrens /* ARGSUSED */ 295fa9e4066Sahrens static void 296fa9e4066Sahrens zil_free_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t claim_txg) 297fa9e4066Sahrens { 298fa9e4066Sahrens zio_free_blk(zilog->zl_spa, bp, dmu_tx_get_txg(tx)); 299fa9e4066Sahrens } 300fa9e4066Sahrens 301fa9e4066Sahrens static void 302fa9e4066Sahrens zil_free_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t claim_txg) 303fa9e4066Sahrens { 304fa9e4066Sahrens /* 305fa9e4066Sahrens * If we previously claimed it, we need to free it. 306fa9e4066Sahrens */ 307fa9e4066Sahrens if (claim_txg != 0 && lrc->lrc_txtype == TX_WRITE) { 308fa9e4066Sahrens lr_write_t *lr = (lr_write_t *)lrc; 309fa9e4066Sahrens blkptr_t *bp = &lr->lr_blkptr; 310fa9e4066Sahrens if (bp->blk_birth >= claim_txg && 311fa9e4066Sahrens !zil_dva_tree_add(&zilog->zl_dva_tree, BP_IDENTITY(bp))) { 312fa9e4066Sahrens (void) arc_free(NULL, zilog->zl_spa, 313fa9e4066Sahrens dmu_tx_get_txg(tx), bp, NULL, NULL, ARC_WAIT); 314fa9e4066Sahrens } 315fa9e4066Sahrens } 316fa9e4066Sahrens } 317fa9e4066Sahrens 318fa9e4066Sahrens /* 319fa9e4066Sahrens * Create an on-disk intent log. 320fa9e4066Sahrens */ 321fa9e4066Sahrens static void 322fa9e4066Sahrens zil_create(zilog_t *zilog) 323fa9e4066Sahrens { 324d80c45e0Sbonwick const zil_header_t *zh = zilog->zl_header; 325fa9e4066Sahrens lwb_t *lwb; 326d80c45e0Sbonwick uint64_t txg = 0; 327d80c45e0Sbonwick dmu_tx_t *tx = NULL; 328fa9e4066Sahrens blkptr_t blk; 329d80c45e0Sbonwick int error = 0; 330fa9e4066Sahrens 331fa9e4066Sahrens /* 332d80c45e0Sbonwick * Wait for any previous destroy to complete. 333fa9e4066Sahrens */ 334d80c45e0Sbonwick txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); 335d80c45e0Sbonwick 336d80c45e0Sbonwick ASSERT(zh->zh_claim_txg == 0); 337d80c45e0Sbonwick ASSERT(zh->zh_replay_seq == 0); 338d80c45e0Sbonwick 339d80c45e0Sbonwick blk = zh->zh_log; 340fa9e4066Sahrens 341fa9e4066Sahrens /* 342d80c45e0Sbonwick * If we don't already have an initial log block, allocate one now. 343fa9e4066Sahrens */ 344d80c45e0Sbonwick if (BP_IS_HOLE(&blk)) { 345d80c45e0Sbonwick tx = dmu_tx_create(zilog->zl_os); 346d80c45e0Sbonwick (void) dmu_tx_assign(tx, TXG_WAIT); 347d80c45e0Sbonwick dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 348d80c45e0Sbonwick txg = dmu_tx_get_txg(tx); 349d80c45e0Sbonwick 350d80c45e0Sbonwick error = zio_alloc_blk(zilog->zl_spa, ZIL_MIN_BLKSZ, &blk, txg); 351d80c45e0Sbonwick 352d80c45e0Sbonwick if (error == 0) 353d80c45e0Sbonwick zil_init_log_chain(zilog, &blk); 35413f5297eSperrin } 355fa9e4066Sahrens 356d80c45e0Sbonwick /* 357d80c45e0Sbonwick * Allocate a log write buffer (lwb) for the first log block. 358d80c45e0Sbonwick */ 359d80c45e0Sbonwick if (error == 0) { 360fa9e4066Sahrens lwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP); 361fa9e4066Sahrens lwb->lwb_zilog = zilog; 362fa9e4066Sahrens lwb->lwb_blk = blk; 363fa9e4066Sahrens lwb->lwb_nused = 0; 364fa9e4066Sahrens lwb->lwb_sz = BP_GET_LSIZE(&lwb->lwb_blk); 365fa9e4066Sahrens lwb->lwb_buf = zio_buf_alloc(lwb->lwb_sz); 366fa9e4066Sahrens lwb->lwb_max_txg = txg; 367fa9e4066Sahrens lwb->lwb_seq = 0; 368fa9e4066Sahrens lwb->lwb_state = UNWRITTEN; 369fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 370fa9e4066Sahrens list_insert_tail(&zilog->zl_lwb_list, lwb); 371fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 372fa9e4066Sahrens } 373fa9e4066Sahrens 374d80c45e0Sbonwick /* 375d80c45e0Sbonwick * If we just allocated the first log block, commit our transaction 376d80c45e0Sbonwick * and wait for zil_sync() to stuff the block poiner into zh_log. 377d80c45e0Sbonwick * (zh is part of the MOS, so we cannot modify it in open context.) 378d80c45e0Sbonwick */ 379d80c45e0Sbonwick if (tx != NULL) { 380d80c45e0Sbonwick dmu_tx_commit(tx); 38113f5297eSperrin txg_wait_synced(zilog->zl_dmu_pool, txg); 382d80c45e0Sbonwick } 383d80c45e0Sbonwick 384d80c45e0Sbonwick ASSERT(bcmp(&blk, &zh->zh_log, sizeof (blk)) == 0); 385fa9e4066Sahrens } 386fa9e4066Sahrens 387fa9e4066Sahrens /* 388fa9e4066Sahrens * In one tx, free all log blocks and clear the log header. 389d80c45e0Sbonwick * If keep_first is set, then we're replaying a log with no content. 390d80c45e0Sbonwick * We want to keep the first block, however, so that the first 391d80c45e0Sbonwick * synchronous transaction doesn't require a txg_wait_synced() 392d80c45e0Sbonwick * in zil_create(). We don't need to txg_wait_synced() here either 393d80c45e0Sbonwick * when keep_first is set, because both zil_create() and zil_destroy() 394d80c45e0Sbonwick * will wait for any in-progress destroys to complete. 395fa9e4066Sahrens */ 396fa9e4066Sahrens void 397d80c45e0Sbonwick zil_destroy(zilog_t *zilog, boolean_t keep_first) 398fa9e4066Sahrens { 399d80c45e0Sbonwick const zil_header_t *zh = zilog->zl_header; 400d80c45e0Sbonwick lwb_t *lwb; 401fa9e4066Sahrens dmu_tx_t *tx; 402fa9e4066Sahrens uint64_t txg; 403fa9e4066Sahrens 404d80c45e0Sbonwick /* 405d80c45e0Sbonwick * Wait for any previous destroy to complete. 406d80c45e0Sbonwick */ 407d80c45e0Sbonwick txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); 408fa9e4066Sahrens 409d80c45e0Sbonwick if (BP_IS_HOLE(&zh->zh_log)) 410fa9e4066Sahrens return; 411fa9e4066Sahrens 412fa9e4066Sahrens tx = dmu_tx_create(zilog->zl_os); 413fa9e4066Sahrens (void) dmu_tx_assign(tx, TXG_WAIT); 414fa9e4066Sahrens dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 415fa9e4066Sahrens txg = dmu_tx_get_txg(tx); 416fa9e4066Sahrens 417d80c45e0Sbonwick mutex_enter(&zilog->zl_lock); 418d80c45e0Sbonwick 419d80c45e0Sbonwick ASSERT3U(zilog->zl_destroy_txg, <, txg); 420fa9e4066Sahrens zilog->zl_destroy_txg = txg; 421d80c45e0Sbonwick zilog->zl_keep_first = keep_first; 422d80c45e0Sbonwick 423d80c45e0Sbonwick if (!list_is_empty(&zilog->zl_lwb_list)) { 424d80c45e0Sbonwick ASSERT(zh->zh_claim_txg == 0); 425d80c45e0Sbonwick ASSERT(!keep_first); 426d80c45e0Sbonwick while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) { 427d80c45e0Sbonwick list_remove(&zilog->zl_lwb_list, lwb); 428d80c45e0Sbonwick if (lwb->lwb_buf != NULL) 429d80c45e0Sbonwick zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); 430d80c45e0Sbonwick zio_free_blk(zilog->zl_spa, &lwb->lwb_blk, txg); 431d80c45e0Sbonwick kmem_cache_free(zil_lwb_cache, lwb); 432d80c45e0Sbonwick } 433d80c45e0Sbonwick mutex_exit(&zilog->zl_lock); 434d80c45e0Sbonwick } else { 435d80c45e0Sbonwick mutex_exit(&zilog->zl_lock); 436d80c45e0Sbonwick if (!keep_first) { 437d80c45e0Sbonwick (void) zil_parse(zilog, zil_free_log_block, 438d80c45e0Sbonwick zil_free_log_record, tx, zh->zh_claim_txg); 439d80c45e0Sbonwick } 440d80c45e0Sbonwick } 441fa9e4066Sahrens 442fa9e4066Sahrens dmu_tx_commit(tx); 443fa9e4066Sahrens 444d80c45e0Sbonwick if (keep_first) /* no need to wait in this case */ 445d80c45e0Sbonwick return; 446d80c45e0Sbonwick 447d80c45e0Sbonwick txg_wait_synced(zilog->zl_dmu_pool, txg); 448d80c45e0Sbonwick ASSERT(BP_IS_HOLE(&zh->zh_log)); 449fa9e4066Sahrens } 450fa9e4066Sahrens 451*1d452cf5Sahrens int 452fa9e4066Sahrens zil_claim(char *osname, void *txarg) 453fa9e4066Sahrens { 454fa9e4066Sahrens dmu_tx_t *tx = txarg; 455fa9e4066Sahrens uint64_t first_txg = dmu_tx_get_txg(tx); 456fa9e4066Sahrens zilog_t *zilog; 457fa9e4066Sahrens zil_header_t *zh; 458fa9e4066Sahrens objset_t *os; 459fa9e4066Sahrens int error; 460fa9e4066Sahrens 461fa9e4066Sahrens error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_STANDARD, &os); 462fa9e4066Sahrens if (error) { 463fa9e4066Sahrens cmn_err(CE_WARN, "can't process intent log for %s", osname); 464*1d452cf5Sahrens return (0); 465fa9e4066Sahrens } 466fa9e4066Sahrens 467fa9e4066Sahrens zilog = dmu_objset_zil(os); 468d80c45e0Sbonwick zh = zil_header_in_syncing_context(zilog); 469fa9e4066Sahrens 470fa9e4066Sahrens /* 471d80c45e0Sbonwick * Claim all log blocks if we haven't already done so, and remember 472d80c45e0Sbonwick * the highest claimed sequence number. This ensures that if we can 473d80c45e0Sbonwick * read only part of the log now (e.g. due to a missing device), 474d80c45e0Sbonwick * but we can read the entire log later, we will not try to replay 475d80c45e0Sbonwick * or destroy beyond the last block we successfully claimed. 476fa9e4066Sahrens */ 477fa9e4066Sahrens ASSERT3U(zh->zh_claim_txg, <=, first_txg); 478fa9e4066Sahrens if (zh->zh_claim_txg == 0 && !BP_IS_HOLE(&zh->zh_log)) { 479fa9e4066Sahrens zh->zh_claim_txg = first_txg; 480d80c45e0Sbonwick zh->zh_claim_seq = zil_parse(zilog, zil_claim_log_block, 481d80c45e0Sbonwick zil_claim_log_record, tx, first_txg); 482fa9e4066Sahrens dsl_dataset_dirty(dmu_objset_ds(os), tx); 483fa9e4066Sahrens } 484d80c45e0Sbonwick 485fa9e4066Sahrens ASSERT3U(first_txg, ==, (spa_last_synced_txg(zilog->zl_spa) + 1)); 486fa9e4066Sahrens dmu_objset_close(os); 487*1d452cf5Sahrens return (0); 488fa9e4066Sahrens } 489fa9e4066Sahrens 490fa9e4066Sahrens void 491fa9e4066Sahrens zil_add_vdev(zilog_t *zilog, uint64_t vdev, uint64_t seq) 492fa9e4066Sahrens { 493fa9e4066Sahrens zil_vdev_t *zv; 494fa9e4066Sahrens 495fa9e4066Sahrens if (zil_noflush) 496fa9e4066Sahrens return; 497fa9e4066Sahrens 498fa9e4066Sahrens ASSERT(MUTEX_HELD(&zilog->zl_lock)); 499fa9e4066Sahrens zv = kmem_alloc(sizeof (zil_vdev_t), KM_SLEEP); 500fa9e4066Sahrens zv->vdev = vdev; 501fa9e4066Sahrens zv->seq = seq; 502fa9e4066Sahrens list_insert_tail(&zilog->zl_vdev_list, zv); 503fa9e4066Sahrens } 504fa9e4066Sahrens 505fa9e4066Sahrens void 506fa9e4066Sahrens zil_flush_vdevs(zilog_t *zilog, uint64_t seq) 507fa9e4066Sahrens { 508fa9e4066Sahrens vdev_t *vd; 509fa9e4066Sahrens zil_vdev_t *zv, *zv2; 510fa9e4066Sahrens zio_t *zio; 511fa9e4066Sahrens spa_t *spa; 512fa9e4066Sahrens uint64_t vdev; 513fa9e4066Sahrens 514fa9e4066Sahrens if (zil_noflush) 515fa9e4066Sahrens return; 516fa9e4066Sahrens 517fa9e4066Sahrens ASSERT(MUTEX_HELD(&zilog->zl_lock)); 518fa9e4066Sahrens 519fa9e4066Sahrens spa = zilog->zl_spa; 520fa9e4066Sahrens zio = NULL; 521fa9e4066Sahrens 522fa9e4066Sahrens while ((zv = list_head(&zilog->zl_vdev_list)) != NULL && 523fa9e4066Sahrens zv->seq <= seq) { 524fa9e4066Sahrens vdev = zv->vdev; 525fa9e4066Sahrens list_remove(&zilog->zl_vdev_list, zv); 526fa9e4066Sahrens kmem_free(zv, sizeof (zil_vdev_t)); 527fa9e4066Sahrens 528fa9e4066Sahrens /* 529fa9e4066Sahrens * remove all chained entries <= seq with same vdev 530fa9e4066Sahrens */ 531fa9e4066Sahrens zv = list_head(&zilog->zl_vdev_list); 532fa9e4066Sahrens while (zv && zv->seq <= seq) { 533fa9e4066Sahrens zv2 = list_next(&zilog->zl_vdev_list, zv); 534fa9e4066Sahrens if (zv->vdev == vdev) { 535fa9e4066Sahrens list_remove(&zilog->zl_vdev_list, zv); 536fa9e4066Sahrens kmem_free(zv, sizeof (zil_vdev_t)); 537fa9e4066Sahrens } 538fa9e4066Sahrens zv = zv2; 539fa9e4066Sahrens } 540fa9e4066Sahrens 541fa9e4066Sahrens /* flush the write cache for this vdev */ 542fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 543fa9e4066Sahrens if (zio == NULL) 544fa9e4066Sahrens zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 545fa9e4066Sahrens vd = vdev_lookup_top(spa, vdev); 546fa9e4066Sahrens ASSERT(vd); 547fa9e4066Sahrens (void) zio_nowait(zio_ioctl(zio, spa, vd, DKIOCFLUSHWRITECACHE, 548fa9e4066Sahrens NULL, NULL, ZIO_PRIORITY_NOW, 549fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY)); 550fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 551fa9e4066Sahrens } 552fa9e4066Sahrens 553fa9e4066Sahrens /* 554fa9e4066Sahrens * Wait for all the flushes to complete. Not all devices actually 555fa9e4066Sahrens * support the DKIOCFLUSHWRITECACHE ioctl, so it's OK if it fails. 556fa9e4066Sahrens */ 55722ac5be4Sperrin if (zio != NULL) { 55822ac5be4Sperrin mutex_exit(&zilog->zl_lock); 559fa9e4066Sahrens (void) zio_wait(zio); 56022ac5be4Sperrin mutex_enter(&zilog->zl_lock); 56122ac5be4Sperrin } 562fa9e4066Sahrens } 563fa9e4066Sahrens 564fa9e4066Sahrens /* 565fa9e4066Sahrens * Function called when a log block write completes 566fa9e4066Sahrens */ 567fa9e4066Sahrens static void 568fa9e4066Sahrens zil_lwb_write_done(zio_t *zio) 569fa9e4066Sahrens { 570fa9e4066Sahrens lwb_t *prev; 571fa9e4066Sahrens lwb_t *lwb = zio->io_private; 572fa9e4066Sahrens zilog_t *zilog = lwb->lwb_zilog; 573fa9e4066Sahrens uint64_t max_seq; 574fa9e4066Sahrens 575fa9e4066Sahrens /* 576fa9e4066Sahrens * Now that we've written this log block, we have a stable pointer 577fa9e4066Sahrens * to the next block in the chain, so it's OK to let the txg in 578fa9e4066Sahrens * which we allocated the next block sync. 579fa9e4066Sahrens */ 580fa9e4066Sahrens txg_rele_to_sync(&lwb->lwb_txgh); 581fa9e4066Sahrens 582fa9e4066Sahrens zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); 583fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 584fa9e4066Sahrens lwb->lwb_buf = NULL; 585fa9e4066Sahrens if (zio->io_error) { 586fa9e4066Sahrens zilog->zl_log_error = B_TRUE; 587fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 588fa9e4066Sahrens cv_broadcast(&zilog->zl_cv_seq); 589fa9e4066Sahrens return; 590fa9e4066Sahrens } 591fa9e4066Sahrens 592fa9e4066Sahrens prev = list_prev(&zilog->zl_lwb_list, lwb); 593fa9e4066Sahrens if (prev && prev->lwb_state != SEQ_COMPLETE) { 594fa9e4066Sahrens /* There's an unwritten buffer in the chain before this one */ 595fa9e4066Sahrens lwb->lwb_state = SEQ_INCOMPLETE; 596fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 597fa9e4066Sahrens return; 598fa9e4066Sahrens } 599fa9e4066Sahrens 600fa9e4066Sahrens max_seq = lwb->lwb_seq; 601fa9e4066Sahrens lwb->lwb_state = SEQ_COMPLETE; 602fa9e4066Sahrens /* 603fa9e4066Sahrens * We must also follow up the chain for already written buffers 604fa9e4066Sahrens * to see if we can set zl_ss_seq even higher. 605fa9e4066Sahrens */ 606fa9e4066Sahrens while (lwb = list_next(&zilog->zl_lwb_list, lwb)) { 607fa9e4066Sahrens if (lwb->lwb_state != SEQ_INCOMPLETE) 608fa9e4066Sahrens break; 609fa9e4066Sahrens lwb->lwb_state = SEQ_COMPLETE; 610fa9e4066Sahrens /* lwb_seq will be zero if we've written an empty buffer */ 611fa9e4066Sahrens if (lwb->lwb_seq) { 612fa9e4066Sahrens ASSERT3U(max_seq, <, lwb->lwb_seq); 613fa9e4066Sahrens max_seq = lwb->lwb_seq; 614fa9e4066Sahrens } 615fa9e4066Sahrens } 616fa9e4066Sahrens zilog->zl_ss_seq = MAX(max_seq, zilog->zl_ss_seq); 617fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 618fa9e4066Sahrens cv_broadcast(&zilog->zl_cv_seq); 619fa9e4066Sahrens } 620fa9e4066Sahrens 621fa9e4066Sahrens /* 622fa9e4066Sahrens * Start a log block write and advance to the next log block. 623fa9e4066Sahrens * Calls are serialized. 624fa9e4066Sahrens */ 625fa9e4066Sahrens static lwb_t * 626fa9e4066Sahrens zil_lwb_write_start(zilog_t *zilog, lwb_t *lwb) 627fa9e4066Sahrens { 628fa9e4066Sahrens lwb_t *nlwb; 629fa9e4066Sahrens zil_trailer_t *ztp = (zil_trailer_t *)(lwb->lwb_buf + lwb->lwb_sz) - 1; 630d80c45e0Sbonwick spa_t *spa = zilog->zl_spa; 631d80c45e0Sbonwick blkptr_t *bp = &ztp->zit_next_blk; 632fa9e4066Sahrens uint64_t txg; 633fa9e4066Sahrens uint64_t zil_blksz; 634ea8dc4b6Seschrock zbookmark_t zb; 635fa9e4066Sahrens int error; 636fa9e4066Sahrens 637fa9e4066Sahrens ASSERT(lwb->lwb_nused <= ZIL_BLK_DATA_SZ(lwb)); 638fa9e4066Sahrens 639fa9e4066Sahrens /* 640fa9e4066Sahrens * Allocate the next block and save its address in this block 641fa9e4066Sahrens * before writing it in order to establish the log chain. 642fa9e4066Sahrens * Note that if the allocation of nlwb synced before we wrote 643fa9e4066Sahrens * the block that points at it (lwb), we'd leak it if we crashed. 644fa9e4066Sahrens * Therefore, we don't do txg_rele_to_sync() until zil_lwb_write_done(). 645fa9e4066Sahrens */ 646fa9e4066Sahrens txg = txg_hold_open(zilog->zl_dmu_pool, &lwb->lwb_txgh); 647fa9e4066Sahrens txg_rele_to_quiesce(&lwb->lwb_txgh); 648fa9e4066Sahrens 649fa9e4066Sahrens /* 65022ac5be4Sperrin * Pick a ZIL blocksize. We request a size that is the 65122ac5be4Sperrin * maximum of the previous used size, the current used size and 65222ac5be4Sperrin * the amount waiting in the queue. 653fa9e4066Sahrens */ 65422ac5be4Sperrin zil_blksz = MAX(zilog->zl_cur_used, zilog->zl_prev_used); 65522ac5be4Sperrin zil_blksz = MAX(zil_blksz, zilog->zl_itx_list_sz + sizeof (*ztp)); 656b4d654b0Sperrin zil_blksz = P2ROUNDUP_TYPED(zil_blksz, ZIL_MIN_BLKSZ, uint64_t); 65722ac5be4Sperrin if (zil_blksz > ZIL_MAX_BLKSZ) 65822ac5be4Sperrin zil_blksz = ZIL_MAX_BLKSZ; 659fa9e4066Sahrens 660d80c45e0Sbonwick error = zio_alloc_blk(spa, zil_blksz, bp, txg); 661fa9e4066Sahrens if (error) { 662ea8dc4b6Seschrock /* 663ea8dc4b6Seschrock * Reinitialise the lwb. 664ea8dc4b6Seschrock * By returning NULL the caller will call tx_wait_synced() 665ea8dc4b6Seschrock */ 666ea8dc4b6Seschrock mutex_enter(&zilog->zl_lock); 667ea8dc4b6Seschrock ASSERT(lwb->lwb_state == UNWRITTEN); 668ea8dc4b6Seschrock lwb->lwb_nused = 0; 669ea8dc4b6Seschrock lwb->lwb_seq = 0; 670ea8dc4b6Seschrock mutex_exit(&zilog->zl_lock); 671fa9e4066Sahrens txg_rele_to_sync(&lwb->lwb_txgh); 672fa9e4066Sahrens return (NULL); 673fa9e4066Sahrens } 674fa9e4066Sahrens 675d80c45e0Sbonwick ASSERT3U(bp->blk_birth, ==, txg); 676ea8dc4b6Seschrock ztp->zit_pad = 0; 677fa9e4066Sahrens ztp->zit_nused = lwb->lwb_nused; 678fa9e4066Sahrens ztp->zit_bt.zbt_cksum = lwb->lwb_blk.blk_cksum; 679d80c45e0Sbonwick bp->blk_cksum = lwb->lwb_blk.blk_cksum; 680d80c45e0Sbonwick bp->blk_cksum.zc_word[ZIL_ZC_SEQ]++; 681fa9e4066Sahrens 682fa9e4066Sahrens /* 683fa9e4066Sahrens * Allocate a new log write buffer (lwb). 684fa9e4066Sahrens */ 685fa9e4066Sahrens nlwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP); 686fa9e4066Sahrens 687fa9e4066Sahrens nlwb->lwb_zilog = zilog; 688d80c45e0Sbonwick nlwb->lwb_blk = *bp; 689fa9e4066Sahrens nlwb->lwb_nused = 0; 690fa9e4066Sahrens nlwb->lwb_sz = BP_GET_LSIZE(&nlwb->lwb_blk); 691fa9e4066Sahrens nlwb->lwb_buf = zio_buf_alloc(nlwb->lwb_sz); 692fa9e4066Sahrens nlwb->lwb_max_txg = txg; 693fa9e4066Sahrens nlwb->lwb_seq = 0; 694fa9e4066Sahrens nlwb->lwb_state = UNWRITTEN; 695fa9e4066Sahrens 696fa9e4066Sahrens /* 697fa9e4066Sahrens * Put new lwb at the end of the log chain, 698fa9e4066Sahrens * and record the vdev for later flushing 699fa9e4066Sahrens */ 700fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 701fa9e4066Sahrens list_insert_tail(&zilog->zl_lwb_list, nlwb); 702fa9e4066Sahrens zil_add_vdev(zilog, DVA_GET_VDEV(BP_IDENTITY(&(lwb->lwb_blk))), 703fa9e4066Sahrens lwb->lwb_seq); 704fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 705fa9e4066Sahrens 706fa9e4066Sahrens /* 707fa9e4066Sahrens * write the old log block 708fa9e4066Sahrens */ 709d80c45e0Sbonwick zb.zb_objset = lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_OBJSET]; 710ea8dc4b6Seschrock zb.zb_object = 0; 711ea8dc4b6Seschrock zb.zb_level = -1; 712d80c45e0Sbonwick zb.zb_blkid = lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_SEQ]; 713ea8dc4b6Seschrock 714d80c45e0Sbonwick zio_nowait(zio_rewrite(NULL, spa, ZIO_CHECKSUM_ZILOG, 0, 715fa9e4066Sahrens &lwb->lwb_blk, lwb->lwb_buf, lwb->lwb_sz, zil_lwb_write_done, lwb, 716ea8dc4b6Seschrock ZIO_PRIORITY_LOG_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb)); 717fa9e4066Sahrens 718fa9e4066Sahrens return (nlwb); 719fa9e4066Sahrens } 720fa9e4066Sahrens 721fa9e4066Sahrens static lwb_t * 722fa9e4066Sahrens zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb) 723fa9e4066Sahrens { 724fa9e4066Sahrens lr_t *lrc = &itx->itx_lr; /* common log record */ 725104e2ed7Sperrin lr_write_t *lr; 726104e2ed7Sperrin char *dbuf; 727fa9e4066Sahrens uint64_t seq = lrc->lrc_seq; 728fa9e4066Sahrens uint64_t txg = lrc->lrc_txg; 729fa9e4066Sahrens uint64_t reclen = lrc->lrc_reclen; 730104e2ed7Sperrin uint64_t dlen = 0; 731fa9e4066Sahrens int error; 732fa9e4066Sahrens 733fa9e4066Sahrens if (lwb == NULL) 734fa9e4066Sahrens return (NULL); 735fa9e4066Sahrens ASSERT(lwb->lwb_buf != NULL); 736fa9e4066Sahrens 737fa9e4066Sahrens /* 738fa9e4066Sahrens * If it's a write, fetch the data or get its blkptr as appropriate. 739fa9e4066Sahrens */ 740fa9e4066Sahrens if (lrc->lrc_txtype == TX_WRITE) { 741104e2ed7Sperrin lr = (lr_write_t *)lrc; 742fa9e4066Sahrens if (txg > spa_freeze_txg(zilog->zl_spa)) 743fa9e4066Sahrens txg_wait_synced(zilog->zl_dmu_pool, txg); 744104e2ed7Sperrin if (itx->itx_wr_state != WR_COPIED) { 745104e2ed7Sperrin if (itx->itx_wr_state == WR_NEED_COPY) { 746b4d654b0Sperrin dlen = P2ROUNDUP_TYPED(lr->lr_length, 747b4d654b0Sperrin sizeof (uint64_t), uint64_t); 748104e2ed7Sperrin ASSERT(dlen); 749104e2ed7Sperrin dbuf = kmem_alloc(dlen, KM_NOSLEEP); 750104e2ed7Sperrin /* on memory shortage use dmu_sync */ 751104e2ed7Sperrin if (dbuf == NULL) { 752104e2ed7Sperrin itx->itx_wr_state = WR_INDIRECT; 753104e2ed7Sperrin dlen = 0; 754104e2ed7Sperrin } 755104e2ed7Sperrin } else { 756104e2ed7Sperrin ASSERT(itx->itx_wr_state == WR_INDIRECT); 757104e2ed7Sperrin dbuf = NULL; 758104e2ed7Sperrin } 759104e2ed7Sperrin error = zilog->zl_get_data(itx->itx_private, lr, dbuf); 760104e2ed7Sperrin if (error) { 761104e2ed7Sperrin if (dlen) 762104e2ed7Sperrin kmem_free(dbuf, dlen); 763104e2ed7Sperrin if (error != ENOENT && error != EALREADY) { 764104e2ed7Sperrin txg_wait_synced(zilog->zl_dmu_pool, 765104e2ed7Sperrin txg); 766104e2ed7Sperrin mutex_enter(&zilog->zl_lock); 767104e2ed7Sperrin zilog->zl_ss_seq = 768104e2ed7Sperrin MAX(seq, zilog->zl_ss_seq); 769104e2ed7Sperrin mutex_exit(&zilog->zl_lock); 770104e2ed7Sperrin return (lwb); 771104e2ed7Sperrin } 772fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 773104e2ed7Sperrin zil_add_vdev(zilog, DVA_GET_VDEV(BP_IDENTITY( 774104e2ed7Sperrin &(lr->lr_blkptr))), seq); 775fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 776fa9e4066Sahrens return (lwb); 777fa9e4066Sahrens } 778fa9e4066Sahrens } 779fa9e4066Sahrens } 780fa9e4066Sahrens 781104e2ed7Sperrin zilog->zl_cur_used += (reclen + dlen); 78222ac5be4Sperrin 783fa9e4066Sahrens /* 784fa9e4066Sahrens * If this record won't fit in the current log block, start a new one. 785fa9e4066Sahrens */ 786104e2ed7Sperrin if (lwb->lwb_nused + reclen + dlen > ZIL_BLK_DATA_SZ(lwb)) { 787fa9e4066Sahrens lwb = zil_lwb_write_start(zilog, lwb); 788104e2ed7Sperrin if (lwb == NULL) { 789104e2ed7Sperrin if (dlen) 790104e2ed7Sperrin kmem_free(dbuf, dlen); 791fa9e4066Sahrens return (NULL); 792104e2ed7Sperrin } 793ea8dc4b6Seschrock ASSERT(lwb->lwb_nused == 0); 794104e2ed7Sperrin if (reclen + dlen > ZIL_BLK_DATA_SZ(lwb)) { 795fa9e4066Sahrens txg_wait_synced(zilog->zl_dmu_pool, txg); 796fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 797fa9e4066Sahrens zilog->zl_ss_seq = MAX(seq, zilog->zl_ss_seq); 798fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 799104e2ed7Sperrin if (dlen) 800104e2ed7Sperrin kmem_free(dbuf, dlen); 801fa9e4066Sahrens return (lwb); 802fa9e4066Sahrens } 803fa9e4066Sahrens } 804fa9e4066Sahrens 805104e2ed7Sperrin lrc->lrc_reclen += dlen; 806fa9e4066Sahrens bcopy(lrc, lwb->lwb_buf + lwb->lwb_nused, reclen); 807fa9e4066Sahrens lwb->lwb_nused += reclen; 808104e2ed7Sperrin if (dlen) { 809104e2ed7Sperrin bcopy(dbuf, lwb->lwb_buf + lwb->lwb_nused, dlen); 810104e2ed7Sperrin lwb->lwb_nused += dlen; 811104e2ed7Sperrin kmem_free(dbuf, dlen); 812104e2ed7Sperrin lrc->lrc_reclen -= dlen; /* for kmem_free of itx */ 813104e2ed7Sperrin } 814fa9e4066Sahrens lwb->lwb_max_txg = MAX(lwb->lwb_max_txg, txg); 815fa9e4066Sahrens ASSERT3U(lwb->lwb_seq, <, seq); 816fa9e4066Sahrens lwb->lwb_seq = seq; 817fa9e4066Sahrens ASSERT3U(lwb->lwb_nused, <=, ZIL_BLK_DATA_SZ(lwb)); 818fa9e4066Sahrens ASSERT3U(P2PHASE(lwb->lwb_nused, sizeof (uint64_t)), ==, 0); 819fa9e4066Sahrens 820fa9e4066Sahrens return (lwb); 821fa9e4066Sahrens } 822fa9e4066Sahrens 823fa9e4066Sahrens itx_t * 824fa9e4066Sahrens zil_itx_create(int txtype, size_t lrsize) 825fa9e4066Sahrens { 826fa9e4066Sahrens itx_t *itx; 827fa9e4066Sahrens 828b4d654b0Sperrin lrsize = P2ROUNDUP_TYPED(lrsize, sizeof (uint64_t), size_t); 829fa9e4066Sahrens 830fa9e4066Sahrens itx = kmem_alloc(offsetof(itx_t, itx_lr) + lrsize, KM_SLEEP); 831fa9e4066Sahrens itx->itx_lr.lrc_txtype = txtype; 832fa9e4066Sahrens itx->itx_lr.lrc_reclen = lrsize; 833fa9e4066Sahrens itx->itx_lr.lrc_seq = 0; /* defensive */ 834fa9e4066Sahrens 835fa9e4066Sahrens return (itx); 836fa9e4066Sahrens } 837fa9e4066Sahrens 838fa9e4066Sahrens uint64_t 839fa9e4066Sahrens zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx) 840fa9e4066Sahrens { 841fa9e4066Sahrens uint64_t seq; 842fa9e4066Sahrens 843fa9e4066Sahrens ASSERT(itx->itx_lr.lrc_seq == 0); 844fa9e4066Sahrens 845fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 846fa9e4066Sahrens list_insert_tail(&zilog->zl_itx_list, itx); 847fa9e4066Sahrens zilog->zl_itx_list_sz += itx->itx_lr.lrc_reclen; 848fa9e4066Sahrens itx->itx_lr.lrc_txg = dmu_tx_get_txg(tx); 849fa9e4066Sahrens itx->itx_lr.lrc_seq = seq = ++zilog->zl_itx_seq; 850fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 851fa9e4066Sahrens 852fa9e4066Sahrens return (seq); 853fa9e4066Sahrens } 854fa9e4066Sahrens 855fa9e4066Sahrens /* 856fa9e4066Sahrens * Free up all in-memory intent log transactions that have now been synced. 857fa9e4066Sahrens */ 858fa9e4066Sahrens static void 859fa9e4066Sahrens zil_itx_clean(zilog_t *zilog) 860fa9e4066Sahrens { 861fa9e4066Sahrens uint64_t synced_txg = spa_last_synced_txg(zilog->zl_spa); 862fa9e4066Sahrens uint64_t freeze_txg = spa_freeze_txg(zilog->zl_spa); 863fa9e4066Sahrens uint64_t max_seq = 0; 864fa9e4066Sahrens itx_t *itx; 865fa9e4066Sahrens 866fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 867fa9e4066Sahrens while ((itx = list_head(&zilog->zl_itx_list)) != NULL && 868fa9e4066Sahrens itx->itx_lr.lrc_txg <= MIN(synced_txg, freeze_txg)) { 869fa9e4066Sahrens list_remove(&zilog->zl_itx_list, itx); 870fa9e4066Sahrens zilog->zl_itx_list_sz -= itx->itx_lr.lrc_reclen; 871fa9e4066Sahrens ASSERT3U(max_seq, <, itx->itx_lr.lrc_seq); 872fa9e4066Sahrens max_seq = itx->itx_lr.lrc_seq; 873fa9e4066Sahrens kmem_free(itx, offsetof(itx_t, itx_lr) 874fa9e4066Sahrens + itx->itx_lr.lrc_reclen); 875fa9e4066Sahrens } 876fa9e4066Sahrens if (max_seq > zilog->zl_ss_seq) { 877fa9e4066Sahrens zilog->zl_ss_seq = max_seq; 878fa9e4066Sahrens cv_broadcast(&zilog->zl_cv_seq); 879fa9e4066Sahrens } 880fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 881fa9e4066Sahrens } 882fa9e4066Sahrens 883fa9e4066Sahrens void 884fa9e4066Sahrens zil_clean(zilog_t *zilog) 885fa9e4066Sahrens { 886fa9e4066Sahrens /* 887fa9e4066Sahrens * Check for any log blocks that can be freed. 888fa9e4066Sahrens * Log blocks are only freed when the log block allocation and 889fa9e4066Sahrens * log records contained within are both known to be committed. 890fa9e4066Sahrens */ 891fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 892fa9e4066Sahrens if (list_head(&zilog->zl_itx_list) != NULL) 893fa9e4066Sahrens (void) taskq_dispatch(zilog->zl_clean_taskq, 894fa9e4066Sahrens (void (*)(void *))zil_itx_clean, zilog, TQ_NOSLEEP); 895fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 896fa9e4066Sahrens } 897fa9e4066Sahrens 898fa9e4066Sahrens /* 899fa9e4066Sahrens * Push zfs transactions to stable storage up to the supplied sequence number. 900fa9e4066Sahrens */ 901fa9e4066Sahrens void 902fa9e4066Sahrens zil_commit(zilog_t *zilog, uint64_t seq, int ioflag) 903fa9e4066Sahrens { 904fa9e4066Sahrens uint64_t txg; 905fa9e4066Sahrens uint64_t max_seq; 906fa9e4066Sahrens uint64_t reclen; 907fa9e4066Sahrens itx_t *itx; 908fa9e4066Sahrens lwb_t *lwb; 909fa9e4066Sahrens spa_t *spa; 910fa9e4066Sahrens 911fa9e4066Sahrens if (zilog == NULL || seq == 0 || 912fa9e4066Sahrens ((ioflag & (FSYNC | FDSYNC | FRSYNC)) == 0 && !zil_always)) 913fa9e4066Sahrens return; 914fa9e4066Sahrens 915fa9e4066Sahrens spa = zilog->zl_spa; 916fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 917fa9e4066Sahrens 918fa9e4066Sahrens seq = MIN(seq, zilog->zl_itx_seq); /* cap seq at largest itx seq */ 919fa9e4066Sahrens 920fa9e4066Sahrens for (;;) { 921fa9e4066Sahrens if (zilog->zl_ss_seq >= seq) { /* already on stable storage */ 922fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 923fa9e4066Sahrens return; 924fa9e4066Sahrens } 925fa9e4066Sahrens 926fa9e4066Sahrens if (zilog->zl_writer == B_FALSE) /* no one writing, do it */ 927fa9e4066Sahrens break; 928fa9e4066Sahrens 929fa9e4066Sahrens cv_wait(&zilog->zl_cv_write, &zilog->zl_lock); 930fa9e4066Sahrens } 931fa9e4066Sahrens 932fa9e4066Sahrens zilog->zl_writer = B_TRUE; 933fa9e4066Sahrens max_seq = 0; 934fa9e4066Sahrens 935fa9e4066Sahrens if (zilog->zl_suspend) { 936fa9e4066Sahrens lwb = NULL; 937fa9e4066Sahrens } else { 938fa9e4066Sahrens lwb = list_tail(&zilog->zl_lwb_list); 939fa9e4066Sahrens if (lwb == NULL) { 940fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 941fa9e4066Sahrens zil_create(zilog); 942fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 943fa9e4066Sahrens lwb = list_tail(&zilog->zl_lwb_list); 944fa9e4066Sahrens } 945fa9e4066Sahrens } 946fa9e4066Sahrens 947fa9e4066Sahrens /* 948fa9e4066Sahrens * Loop through in-memory log transactions filling log blocks, 949fa9e4066Sahrens * until we reach the given sequence number and there's no more 950fa9e4066Sahrens * room in the write buffer. 951fa9e4066Sahrens */ 952fa9e4066Sahrens for (;;) { 953fa9e4066Sahrens itx = list_head(&zilog->zl_itx_list); 954fa9e4066Sahrens if (itx == NULL) 955fa9e4066Sahrens break; 956fa9e4066Sahrens 957fa9e4066Sahrens reclen = itx->itx_lr.lrc_reclen; 958fa9e4066Sahrens if ((itx->itx_lr.lrc_seq > seq) && 959fa9e4066Sahrens ((lwb == NULL) || (lwb->lwb_nused + reclen > 960fa9e4066Sahrens ZIL_BLK_DATA_SZ(lwb)))) 961fa9e4066Sahrens break; 962fa9e4066Sahrens 963fa9e4066Sahrens list_remove(&zilog->zl_itx_list, itx); 964fa9e4066Sahrens txg = itx->itx_lr.lrc_txg; 965fa9e4066Sahrens ASSERT(txg); 966fa9e4066Sahrens 967fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 968fa9e4066Sahrens if (txg > spa_last_synced_txg(spa) || 969fa9e4066Sahrens txg > spa_freeze_txg(spa)) 970fa9e4066Sahrens lwb = zil_lwb_commit(zilog, itx, lwb); 971fa9e4066Sahrens else 972fa9e4066Sahrens max_seq = itx->itx_lr.lrc_seq; 973fa9e4066Sahrens kmem_free(itx, offsetof(itx_t, itx_lr) 974fa9e4066Sahrens + itx->itx_lr.lrc_reclen); 975fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 976fa9e4066Sahrens zilog->zl_itx_list_sz -= reclen; 977fa9e4066Sahrens } 978fa9e4066Sahrens 979fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 980fa9e4066Sahrens 981fa9e4066Sahrens /* write the last block out */ 982fa9e4066Sahrens if (lwb != NULL && lwb->lwb_nused != 0) 983fa9e4066Sahrens lwb = zil_lwb_write_start(zilog, lwb); 984fa9e4066Sahrens 98522ac5be4Sperrin zilog->zl_prev_used = zilog->zl_cur_used; 98622ac5be4Sperrin zilog->zl_cur_used = 0; 987fa9e4066Sahrens 98822ac5be4Sperrin mutex_enter(&zilog->zl_lock); 989fa9e4066Sahrens if (max_seq > zilog->zl_ss_seq) { 990fa9e4066Sahrens zilog->zl_ss_seq = max_seq; 991fa9e4066Sahrens cv_broadcast(&zilog->zl_cv_seq); 992fa9e4066Sahrens } 993fa9e4066Sahrens /* 994fa9e4066Sahrens * Wait if necessary for our seq to be committed. 995fa9e4066Sahrens */ 996fa9e4066Sahrens if (lwb) { 997fa9e4066Sahrens while (zilog->zl_ss_seq < seq && zilog->zl_log_error == 0) 998fa9e4066Sahrens cv_wait(&zilog->zl_cv_seq, &zilog->zl_lock); 999fa9e4066Sahrens zil_flush_vdevs(zilog, seq); 1000fa9e4066Sahrens } 100122ac5be4Sperrin 1002fa9e4066Sahrens if (zilog->zl_log_error || lwb == NULL) { 1003fa9e4066Sahrens zilog->zl_log_error = 0; 1004fa9e4066Sahrens max_seq = zilog->zl_itx_seq; 1005fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 1006fa9e4066Sahrens txg_wait_synced(zilog->zl_dmu_pool, 0); 1007fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 1008fa9e4066Sahrens zilog->zl_ss_seq = MAX(max_seq, zilog->zl_ss_seq); 1009fa9e4066Sahrens cv_broadcast(&zilog->zl_cv_seq); 1010fa9e4066Sahrens } 101122ac5be4Sperrin /* wake up others waiting to start a write */ 101222ac5be4Sperrin zilog->zl_writer = B_FALSE; 1013fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 1014fe9cf88cSperrin cv_broadcast(&zilog->zl_cv_write); 1015fa9e4066Sahrens } 1016fa9e4066Sahrens 1017fa9e4066Sahrens /* 1018fa9e4066Sahrens * Called in syncing context to free committed log blocks and update log header. 1019fa9e4066Sahrens */ 1020fa9e4066Sahrens void 1021fa9e4066Sahrens zil_sync(zilog_t *zilog, dmu_tx_t *tx) 1022fa9e4066Sahrens { 1023d80c45e0Sbonwick zil_header_t *zh = zil_header_in_syncing_context(zilog); 1024fa9e4066Sahrens uint64_t txg = dmu_tx_get_txg(tx); 1025fa9e4066Sahrens spa_t *spa = zilog->zl_spa; 1026fa9e4066Sahrens lwb_t *lwb; 1027fa9e4066Sahrens 1028d80c45e0Sbonwick mutex_enter(&zilog->zl_lock); 1029d80c45e0Sbonwick 1030fa9e4066Sahrens ASSERT(zilog->zl_stop_sync == 0); 1031fa9e4066Sahrens 1032d80c45e0Sbonwick zh->zh_replay_seq = zilog->zl_replay_seq[txg & TXG_MASK]; 1033fa9e4066Sahrens 1034fa9e4066Sahrens if (zilog->zl_destroy_txg == txg) { 1035d80c45e0Sbonwick blkptr_t blk = zh->zh_log; 1036d80c45e0Sbonwick 1037d80c45e0Sbonwick ASSERT(list_head(&zilog->zl_lwb_list) == NULL); 1038d80c45e0Sbonwick ASSERT(spa_sync_pass(spa) == 1); 1039d80c45e0Sbonwick 1040d80c45e0Sbonwick bzero(zh, sizeof (zil_header_t)); 1041fa9e4066Sahrens bzero(zilog->zl_replay_seq, sizeof (zilog->zl_replay_seq)); 1042d80c45e0Sbonwick 1043d80c45e0Sbonwick if (zilog->zl_keep_first) { 1044d80c45e0Sbonwick /* 1045d80c45e0Sbonwick * If this block was part of log chain that couldn't 1046d80c45e0Sbonwick * be claimed because a device was missing during 1047d80c45e0Sbonwick * zil_claim(), but that device later returns, 1048d80c45e0Sbonwick * then this block could erroneously appear valid. 1049d80c45e0Sbonwick * To guard against this, assign a new GUID to the new 1050d80c45e0Sbonwick * log chain so it doesn't matter what blk points to. 1051d80c45e0Sbonwick */ 1052d80c45e0Sbonwick zil_init_log_chain(zilog, &blk); 1053d80c45e0Sbonwick zh->zh_log = blk; 1054d80c45e0Sbonwick } 1055fa9e4066Sahrens } 1056fa9e4066Sahrens 1057fa9e4066Sahrens for (;;) { 1058fa9e4066Sahrens lwb = list_head(&zilog->zl_lwb_list); 1059fa9e4066Sahrens if (lwb == NULL) { 1060fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 1061fa9e4066Sahrens return; 1062fa9e4066Sahrens } 1063fa9e4066Sahrens if (lwb->lwb_buf != NULL || lwb->lwb_max_txg > txg) 1064fa9e4066Sahrens break; 1065fa9e4066Sahrens list_remove(&zilog->zl_lwb_list, lwb); 1066fa9e4066Sahrens zio_free_blk(spa, &lwb->lwb_blk, txg); 1067fa9e4066Sahrens kmem_cache_free(zil_lwb_cache, lwb); 1068fa9e4066Sahrens } 1069d80c45e0Sbonwick zh->zh_log = lwb->lwb_blk; 1070fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 1071fa9e4066Sahrens } 1072fa9e4066Sahrens 1073fa9e4066Sahrens void 1074fa9e4066Sahrens zil_init(void) 1075fa9e4066Sahrens { 1076fa9e4066Sahrens zil_lwb_cache = kmem_cache_create("zil_lwb_cache", 1077fa9e4066Sahrens sizeof (struct lwb), NULL, NULL, NULL, NULL, NULL, NULL, 0); 1078fa9e4066Sahrens } 1079fa9e4066Sahrens 1080fa9e4066Sahrens void 1081fa9e4066Sahrens zil_fini(void) 1082fa9e4066Sahrens { 1083fa9e4066Sahrens kmem_cache_destroy(zil_lwb_cache); 1084fa9e4066Sahrens } 1085fa9e4066Sahrens 1086fa9e4066Sahrens zilog_t * 1087fa9e4066Sahrens zil_alloc(objset_t *os, zil_header_t *zh_phys) 1088fa9e4066Sahrens { 1089fa9e4066Sahrens zilog_t *zilog; 1090fa9e4066Sahrens 1091fa9e4066Sahrens zilog = kmem_zalloc(sizeof (zilog_t), KM_SLEEP); 1092fa9e4066Sahrens 1093fa9e4066Sahrens zilog->zl_header = zh_phys; 1094fa9e4066Sahrens zilog->zl_os = os; 1095fa9e4066Sahrens zilog->zl_spa = dmu_objset_spa(os); 1096fa9e4066Sahrens zilog->zl_dmu_pool = dmu_objset_pool(os); 1097d80c45e0Sbonwick zilog->zl_destroy_txg = TXG_INITIAL - 1; 1098fa9e4066Sahrens 1099fa9e4066Sahrens list_create(&zilog->zl_itx_list, sizeof (itx_t), 1100fa9e4066Sahrens offsetof(itx_t, itx_node)); 1101fa9e4066Sahrens 1102fa9e4066Sahrens list_create(&zilog->zl_lwb_list, sizeof (lwb_t), 1103fa9e4066Sahrens offsetof(lwb_t, lwb_node)); 1104fa9e4066Sahrens 1105fa9e4066Sahrens list_create(&zilog->zl_vdev_list, sizeof (zil_vdev_t), 1106fa9e4066Sahrens offsetof(zil_vdev_t, vdev_seq_node)); 1107fa9e4066Sahrens 1108fa9e4066Sahrens return (zilog); 1109fa9e4066Sahrens } 1110fa9e4066Sahrens 1111fa9e4066Sahrens void 1112fa9e4066Sahrens zil_free(zilog_t *zilog) 1113fa9e4066Sahrens { 1114fa9e4066Sahrens lwb_t *lwb; 1115fa9e4066Sahrens zil_vdev_t *zv; 1116fa9e4066Sahrens 1117fa9e4066Sahrens zilog->zl_stop_sync = 1; 1118fa9e4066Sahrens 1119fa9e4066Sahrens while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) { 1120fa9e4066Sahrens list_remove(&zilog->zl_lwb_list, lwb); 1121fa9e4066Sahrens if (lwb->lwb_buf != NULL) 1122fa9e4066Sahrens zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); 1123fa9e4066Sahrens kmem_cache_free(zil_lwb_cache, lwb); 1124fa9e4066Sahrens } 1125fa9e4066Sahrens list_destroy(&zilog->zl_lwb_list); 1126fa9e4066Sahrens 1127fa9e4066Sahrens while ((zv = list_head(&zilog->zl_vdev_list)) != NULL) { 1128fa9e4066Sahrens list_remove(&zilog->zl_vdev_list, zv); 1129fa9e4066Sahrens kmem_free(zv, sizeof (zil_vdev_t)); 1130fa9e4066Sahrens } 1131fa9e4066Sahrens list_destroy(&zilog->zl_vdev_list); 1132fa9e4066Sahrens 1133fa9e4066Sahrens ASSERT(list_head(&zilog->zl_itx_list) == NULL); 1134fa9e4066Sahrens list_destroy(&zilog->zl_itx_list); 1135fa9e4066Sahrens 1136fa9e4066Sahrens kmem_free(zilog, sizeof (zilog_t)); 1137fa9e4066Sahrens } 1138fa9e4066Sahrens 113913f5297eSperrin /* 1140436b2950Sperrin * return true if the initial log block is not valid 114113f5297eSperrin */ 114213f5297eSperrin static int 114313f5297eSperrin zil_empty(zilog_t *zilog) 114413f5297eSperrin { 1145d80c45e0Sbonwick const zil_header_t *zh = zilog->zl_header; 1146d80c45e0Sbonwick arc_buf_t *abuf = NULL; 114713f5297eSperrin 1148d80c45e0Sbonwick if (BP_IS_HOLE(&zh->zh_log)) 114913f5297eSperrin return (1); 115013f5297eSperrin 1151d80c45e0Sbonwick if (zil_read_log_block(zilog, &zh->zh_log, &abuf) != 0) 1152d80c45e0Sbonwick return (1); 1153d80c45e0Sbonwick 1154d80c45e0Sbonwick VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 1155d80c45e0Sbonwick return (0); 115613f5297eSperrin } 115713f5297eSperrin 1158fa9e4066Sahrens /* 1159fa9e4066Sahrens * Open an intent log. 1160fa9e4066Sahrens */ 1161fa9e4066Sahrens zilog_t * 1162fa9e4066Sahrens zil_open(objset_t *os, zil_get_data_t *get_data) 1163fa9e4066Sahrens { 1164fa9e4066Sahrens zilog_t *zilog = dmu_objset_zil(os); 1165fa9e4066Sahrens 1166fa9e4066Sahrens zilog->zl_get_data = get_data; 1167fa9e4066Sahrens zilog->zl_clean_taskq = taskq_create("zil_clean", 1, minclsyspri, 1168fa9e4066Sahrens 2, 2, TASKQ_PREPOPULATE); 1169fa9e4066Sahrens 1170fa9e4066Sahrens return (zilog); 1171fa9e4066Sahrens } 1172fa9e4066Sahrens 1173fa9e4066Sahrens /* 1174fa9e4066Sahrens * Close an intent log. 1175fa9e4066Sahrens */ 1176fa9e4066Sahrens void 1177fa9e4066Sahrens zil_close(zilog_t *zilog) 1178fa9e4066Sahrens { 1179d80c45e0Sbonwick /* 1180d80c45e0Sbonwick * If the log isn't already committed, mark the objset dirty 1181d80c45e0Sbonwick * (so zil_sync() will be called) and wait for that txg to sync. 1182d80c45e0Sbonwick */ 1183d80c45e0Sbonwick if (!zil_is_committed(zilog)) { 1184d80c45e0Sbonwick uint64_t txg; 1185d80c45e0Sbonwick dmu_tx_t *tx = dmu_tx_create(zilog->zl_os); 1186d80c45e0Sbonwick (void) dmu_tx_assign(tx, TXG_WAIT); 1187d80c45e0Sbonwick dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 1188d80c45e0Sbonwick txg = dmu_tx_get_txg(tx); 1189d80c45e0Sbonwick dmu_tx_commit(tx); 1190d80c45e0Sbonwick txg_wait_synced(zilog->zl_dmu_pool, txg); 1191d80c45e0Sbonwick } 1192d80c45e0Sbonwick 1193fa9e4066Sahrens taskq_destroy(zilog->zl_clean_taskq); 1194fa9e4066Sahrens zilog->zl_clean_taskq = NULL; 1195fa9e4066Sahrens zilog->zl_get_data = NULL; 1196fa9e4066Sahrens 1197fa9e4066Sahrens zil_itx_clean(zilog); 1198fa9e4066Sahrens ASSERT(list_head(&zilog->zl_itx_list) == NULL); 1199fa9e4066Sahrens } 1200fa9e4066Sahrens 1201fa9e4066Sahrens /* 1202fa9e4066Sahrens * Suspend an intent log. While in suspended mode, we still honor 1203fa9e4066Sahrens * synchronous semantics, but we rely on txg_wait_synced() to do it. 1204fa9e4066Sahrens * We suspend the log briefly when taking a snapshot so that the snapshot 1205fa9e4066Sahrens * contains all the data it's supposed to, and has an empty intent log. 1206fa9e4066Sahrens */ 1207fa9e4066Sahrens int 1208fa9e4066Sahrens zil_suspend(zilog_t *zilog) 1209fa9e4066Sahrens { 1210d80c45e0Sbonwick const zil_header_t *zh = zilog->zl_header; 1211fa9e4066Sahrens lwb_t *lwb; 1212fa9e4066Sahrens 1213fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 1214d80c45e0Sbonwick if (zh->zh_claim_txg != 0) { /* unplayed log */ 1215fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 1216fa9e4066Sahrens return (EBUSY); 1217fa9e4066Sahrens } 1218d80c45e0Sbonwick if (zilog->zl_suspend++ != 0) { 1219d80c45e0Sbonwick /* 1220d80c45e0Sbonwick * Someone else already began a suspend. 1221d80c45e0Sbonwick * Just wait for them to finish. 1222d80c45e0Sbonwick */ 1223d80c45e0Sbonwick while (zilog->zl_suspending) 1224d80c45e0Sbonwick cv_wait(&zilog->zl_cv_suspend, &zilog->zl_lock); 1225d80c45e0Sbonwick ASSERT(BP_IS_HOLE(&zh->zh_log)); 1226d80c45e0Sbonwick mutex_exit(&zilog->zl_lock); 1227d80c45e0Sbonwick return (0); 1228d80c45e0Sbonwick } 1229d80c45e0Sbonwick zilog->zl_suspending = B_TRUE; 1230fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 1231fa9e4066Sahrens 1232fa9e4066Sahrens zil_commit(zilog, UINT64_MAX, FSYNC); 1233fa9e4066Sahrens 1234fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 1235d80c45e0Sbonwick for (;;) { 1236d80c45e0Sbonwick /* 1237d80c45e0Sbonwick * Wait for any in-flight log writes to complete. 1238d80c45e0Sbonwick */ 1239d80c45e0Sbonwick for (lwb = list_head(&zilog->zl_lwb_list); lwb != NULL; 1240d80c45e0Sbonwick lwb = list_next(&zilog->zl_lwb_list, lwb)) 1241d80c45e0Sbonwick if (lwb->lwb_seq != 0 && lwb->lwb_state != SEQ_COMPLETE) 1242d80c45e0Sbonwick break; 1243d80c45e0Sbonwick 1244d80c45e0Sbonwick if (lwb == NULL) 1245d80c45e0Sbonwick break; 1246d80c45e0Sbonwick 1247d80c45e0Sbonwick cv_wait(&zilog->zl_cv_seq, &zilog->zl_lock); 1248fa9e4066Sahrens } 1249d80c45e0Sbonwick 1250fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 1251fa9e4066Sahrens 1252d80c45e0Sbonwick zil_destroy(zilog, B_FALSE); 1253d80c45e0Sbonwick 1254d80c45e0Sbonwick mutex_enter(&zilog->zl_lock); 1255d80c45e0Sbonwick ASSERT(BP_IS_HOLE(&zh->zh_log)); 1256d80c45e0Sbonwick zilog->zl_suspending = B_FALSE; 1257d80c45e0Sbonwick cv_broadcast(&zilog->zl_cv_suspend); 1258d80c45e0Sbonwick mutex_exit(&zilog->zl_lock); 1259fa9e4066Sahrens 1260fa9e4066Sahrens return (0); 1261fa9e4066Sahrens } 1262fa9e4066Sahrens 1263fa9e4066Sahrens void 1264fa9e4066Sahrens zil_resume(zilog_t *zilog) 1265fa9e4066Sahrens { 1266fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 1267fa9e4066Sahrens ASSERT(zilog->zl_suspend != 0); 1268fa9e4066Sahrens zilog->zl_suspend--; 1269fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 1270fa9e4066Sahrens } 1271fa9e4066Sahrens 1272fa9e4066Sahrens typedef struct zil_replay_arg { 1273fa9e4066Sahrens objset_t *zr_os; 1274fa9e4066Sahrens zil_replay_func_t **zr_replay; 1275fa9e4066Sahrens void *zr_arg; 1276fa9e4066Sahrens void (*zr_rm_sync)(void *arg); 1277fa9e4066Sahrens uint64_t *zr_txgp; 1278fa9e4066Sahrens boolean_t zr_byteswap; 1279fa9e4066Sahrens char *zr_lrbuf; 1280fa9e4066Sahrens } zil_replay_arg_t; 1281fa9e4066Sahrens 1282fa9e4066Sahrens static void 1283fa9e4066Sahrens zil_replay_log_record(zilog_t *zilog, lr_t *lr, void *zra, uint64_t claim_txg) 1284fa9e4066Sahrens { 1285fa9e4066Sahrens zil_replay_arg_t *zr = zra; 1286d80c45e0Sbonwick const zil_header_t *zh = zilog->zl_header; 1287fa9e4066Sahrens uint64_t reclen = lr->lrc_reclen; 1288fa9e4066Sahrens uint64_t txtype = lr->lrc_txtype; 1289fa9e4066Sahrens int pass, error; 1290fa9e4066Sahrens 1291fa9e4066Sahrens if (zilog->zl_stop_replay) 1292fa9e4066Sahrens return; 1293fa9e4066Sahrens 1294fa9e4066Sahrens if (lr->lrc_txg < claim_txg) /* already committed */ 1295fa9e4066Sahrens return; 1296fa9e4066Sahrens 1297fa9e4066Sahrens if (lr->lrc_seq <= zh->zh_replay_seq) /* already replayed */ 1298fa9e4066Sahrens return; 1299fa9e4066Sahrens 1300fa9e4066Sahrens /* 1301fa9e4066Sahrens * Make a copy of the data so we can revise and extend it. 1302fa9e4066Sahrens */ 1303fa9e4066Sahrens bcopy(lr, zr->zr_lrbuf, reclen); 1304fa9e4066Sahrens 1305fa9e4066Sahrens /* 1306fa9e4066Sahrens * The log block containing this lr may have been byteswapped 1307fa9e4066Sahrens * so that we can easily examine common fields like lrc_txtype. 1308fa9e4066Sahrens * However, the log is a mix of different data types, and only the 1309fa9e4066Sahrens * replay vectors know how to byteswap their records. Therefore, if 1310fa9e4066Sahrens * the lr was byteswapped, undo it before invoking the replay vector. 1311fa9e4066Sahrens */ 1312fa9e4066Sahrens if (zr->zr_byteswap) 1313fa9e4066Sahrens byteswap_uint64_array(zr->zr_lrbuf, reclen); 1314fa9e4066Sahrens 1315fa9e4066Sahrens /* 1316fa9e4066Sahrens * If this is a TX_WRITE with a blkptr, suck in the data. 1317fa9e4066Sahrens */ 1318fa9e4066Sahrens if (txtype == TX_WRITE && reclen == sizeof (lr_write_t)) { 1319fa9e4066Sahrens lr_write_t *lrw = (lr_write_t *)lr; 1320fa9e4066Sahrens blkptr_t *wbp = &lrw->lr_blkptr; 1321fa9e4066Sahrens uint64_t wlen = lrw->lr_length; 1322fa9e4066Sahrens char *wbuf = zr->zr_lrbuf + reclen; 1323fa9e4066Sahrens 1324fa9e4066Sahrens if (BP_IS_HOLE(wbp)) { /* compressed to a hole */ 1325fa9e4066Sahrens bzero(wbuf, wlen); 1326fa9e4066Sahrens } else { 1327fa9e4066Sahrens /* 1328fa9e4066Sahrens * A subsequent write may have overwritten this block, 1329fa9e4066Sahrens * in which case wbp may have been been freed and 1330fa9e4066Sahrens * reallocated, and our read of wbp may fail with a 1331fa9e4066Sahrens * checksum error. We can safely ignore this because 1332fa9e4066Sahrens * the later write will provide the correct data. 1333fa9e4066Sahrens */ 1334ea8dc4b6Seschrock zbookmark_t zb; 1335ea8dc4b6Seschrock 1336ea8dc4b6Seschrock zb.zb_objset = dmu_objset_id(zilog->zl_os); 1337ea8dc4b6Seschrock zb.zb_object = lrw->lr_foid; 1338ea8dc4b6Seschrock zb.zb_level = -1; 1339ea8dc4b6Seschrock zb.zb_blkid = lrw->lr_offset / BP_GET_LSIZE(wbp); 1340ea8dc4b6Seschrock 1341fa9e4066Sahrens (void) zio_wait(zio_read(NULL, zilog->zl_spa, 1342fa9e4066Sahrens wbp, wbuf, BP_GET_LSIZE(wbp), NULL, NULL, 1343fa9e4066Sahrens ZIO_PRIORITY_SYNC_READ, 1344ea8dc4b6Seschrock ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &zb)); 1345fa9e4066Sahrens (void) memmove(wbuf, wbuf + lrw->lr_blkoff, wlen); 1346fa9e4066Sahrens } 1347fa9e4066Sahrens } 1348fa9e4066Sahrens 1349fa9e4066Sahrens /* 1350fa9e4066Sahrens * We must now do two things atomically: replay this log record, 1351fa9e4066Sahrens * and update the log header to reflect the fact that we did so. 1352fa9e4066Sahrens * We use the DMU's ability to assign into a specific txg to do this. 1353fa9e4066Sahrens */ 1354fa9e4066Sahrens for (pass = 1; /* CONSTANTCONDITION */; pass++) { 1355fa9e4066Sahrens uint64_t replay_txg; 1356fa9e4066Sahrens dmu_tx_t *replay_tx; 1357fa9e4066Sahrens 1358fa9e4066Sahrens replay_tx = dmu_tx_create(zr->zr_os); 1359fa9e4066Sahrens error = dmu_tx_assign(replay_tx, TXG_WAIT); 1360fa9e4066Sahrens if (error) { 1361fa9e4066Sahrens dmu_tx_abort(replay_tx); 1362fa9e4066Sahrens break; 1363fa9e4066Sahrens } 1364fa9e4066Sahrens 1365fa9e4066Sahrens replay_txg = dmu_tx_get_txg(replay_tx); 1366fa9e4066Sahrens 1367fa9e4066Sahrens if (txtype == 0 || txtype >= TX_MAX_TYPE) { 1368fa9e4066Sahrens error = EINVAL; 1369fa9e4066Sahrens } else { 1370fa9e4066Sahrens /* 1371fa9e4066Sahrens * On the first pass, arrange for the replay vector 1372fa9e4066Sahrens * to fail its dmu_tx_assign(). That's the only way 1373fa9e4066Sahrens * to ensure that those code paths remain well tested. 1374fa9e4066Sahrens */ 1375fa9e4066Sahrens *zr->zr_txgp = replay_txg - (pass == 1); 1376fa9e4066Sahrens error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lrbuf, 1377fa9e4066Sahrens zr->zr_byteswap); 1378fa9e4066Sahrens *zr->zr_txgp = TXG_NOWAIT; 1379fa9e4066Sahrens } 1380fa9e4066Sahrens 1381fa9e4066Sahrens if (error == 0) { 1382fa9e4066Sahrens dsl_dataset_dirty(dmu_objset_ds(zr->zr_os), replay_tx); 1383fa9e4066Sahrens zilog->zl_replay_seq[replay_txg & TXG_MASK] = 1384fa9e4066Sahrens lr->lrc_seq; 1385fa9e4066Sahrens } 1386fa9e4066Sahrens 1387fa9e4066Sahrens dmu_tx_commit(replay_tx); 1388fa9e4066Sahrens 1389fa9e4066Sahrens if (error != ERESTART) 1390fa9e4066Sahrens break; 1391fa9e4066Sahrens 1392fa9e4066Sahrens if (pass != 1) 1393fa9e4066Sahrens txg_wait_open(spa_get_dsl(zilog->zl_spa), 1394fa9e4066Sahrens replay_txg + 1); 1395fa9e4066Sahrens 1396fa9e4066Sahrens dprintf("pass %d, retrying\n", pass); 1397fa9e4066Sahrens } 1398fa9e4066Sahrens 1399fa9e4066Sahrens if (error) { 1400fa9e4066Sahrens char *name = kmem_alloc(MAXNAMELEN, KM_SLEEP); 1401fa9e4066Sahrens dmu_objset_name(zr->zr_os, name); 1402fa9e4066Sahrens cmn_err(CE_WARN, "ZFS replay transaction error %d, " 1403fa9e4066Sahrens "dataset %s, seq 0x%llx, txtype %llu\n", 1404fa9e4066Sahrens error, name, 1405fa9e4066Sahrens (u_longlong_t)lr->lrc_seq, (u_longlong_t)txtype); 1406fa9e4066Sahrens zilog->zl_stop_replay = 1; 1407fa9e4066Sahrens kmem_free(name, MAXNAMELEN); 1408fa9e4066Sahrens } 1409fa9e4066Sahrens 1410fa9e4066Sahrens /* 1411fa9e4066Sahrens * The DMU's dnode layer doesn't see removes until the txg commits, 1412fa9e4066Sahrens * so a subsequent claim can spuriously fail with EEXIST. 1413fa9e4066Sahrens * To prevent this, if we might have removed an object, 1414fa9e4066Sahrens * wait for the delete thread to delete it, and then 1415fa9e4066Sahrens * wait for the transaction group to sync. 1416fa9e4066Sahrens */ 1417fa9e4066Sahrens if (txtype == TX_REMOVE || txtype == TX_RMDIR || txtype == TX_RENAME) { 1418fa9e4066Sahrens if (zr->zr_rm_sync != NULL) 1419fa9e4066Sahrens zr->zr_rm_sync(zr->zr_arg); 1420fa9e4066Sahrens txg_wait_synced(spa_get_dsl(zilog->zl_spa), 0); 1421fa9e4066Sahrens } 1422fa9e4066Sahrens } 1423fa9e4066Sahrens 1424fa9e4066Sahrens /* 142513f5297eSperrin * If this dataset has a non-empty intent log, replay it and destroy it. 1426fa9e4066Sahrens */ 1427fa9e4066Sahrens void 1428fa9e4066Sahrens zil_replay(objset_t *os, void *arg, uint64_t *txgp, 1429fa9e4066Sahrens zil_replay_func_t *replay_func[TX_MAX_TYPE], void (*rm_sync)(void *arg)) 1430fa9e4066Sahrens { 1431fa9e4066Sahrens zilog_t *zilog = dmu_objset_zil(os); 1432d80c45e0Sbonwick const zil_header_t *zh = zilog->zl_header; 1433d80c45e0Sbonwick zil_replay_arg_t zr; 143413f5297eSperrin 143513f5297eSperrin if (zil_empty(zilog)) { 1436d80c45e0Sbonwick zil_destroy(zilog, B_TRUE); 143713f5297eSperrin return; 143813f5297eSperrin } 1439fa9e4066Sahrens 1440fa9e4066Sahrens zr.zr_os = os; 1441fa9e4066Sahrens zr.zr_replay = replay_func; 1442fa9e4066Sahrens zr.zr_arg = arg; 1443fa9e4066Sahrens zr.zr_rm_sync = rm_sync; 1444fa9e4066Sahrens zr.zr_txgp = txgp; 1445d80c45e0Sbonwick zr.zr_byteswap = BP_SHOULD_BYTESWAP(&zh->zh_log); 1446fa9e4066Sahrens zr.zr_lrbuf = kmem_alloc(2 * SPA_MAXBLOCKSIZE, KM_SLEEP); 1447fa9e4066Sahrens 1448fa9e4066Sahrens /* 1449fa9e4066Sahrens * Wait for in-progress removes to sync before starting replay. 1450fa9e4066Sahrens */ 1451fa9e4066Sahrens if (rm_sync != NULL) 1452fa9e4066Sahrens rm_sync(arg); 1453fa9e4066Sahrens txg_wait_synced(zilog->zl_dmu_pool, 0); 1454fa9e4066Sahrens 1455fa9e4066Sahrens zilog->zl_stop_replay = 0; 1456d80c45e0Sbonwick (void) zil_parse(zilog, NULL, zil_replay_log_record, &zr, 1457d80c45e0Sbonwick zh->zh_claim_txg); 1458fa9e4066Sahrens kmem_free(zr.zr_lrbuf, 2 * SPA_MAXBLOCKSIZE); 1459fa9e4066Sahrens 1460d80c45e0Sbonwick zil_destroy(zilog, B_FALSE); 1461fa9e4066Sahrens } 1462436b2950Sperrin 1463436b2950Sperrin /* 1464436b2950Sperrin * Report whether all transactions are committed 1465436b2950Sperrin */ 1466436b2950Sperrin int 1467436b2950Sperrin zil_is_committed(zilog_t *zilog) 1468436b2950Sperrin { 1469436b2950Sperrin lwb_t *lwb; 1470436b2950Sperrin 1471d80c45e0Sbonwick if (!list_is_empty(&zilog->zl_itx_list)) 1472436b2950Sperrin return (B_FALSE); 1473436b2950Sperrin 1474436b2950Sperrin /* 1475436b2950Sperrin * A log write buffer at the head of the list that is not UNWRITTEN 1476436b2950Sperrin * means there's a lwb yet to be freed after a txg commit 1477436b2950Sperrin */ 1478436b2950Sperrin lwb = list_head(&zilog->zl_lwb_list); 1479436b2950Sperrin if (lwb && lwb->lwb_state != UNWRITTEN) 1480436b2950Sperrin return (B_FALSE); 1481436b2950Sperrin ASSERT(zil_empty(zilog)); 1482436b2950Sperrin return (B_TRUE); 1483436b2950Sperrin } 1484