zil.c revision 200724
1168404Spjd/* 2168404Spjd * CDDL HEADER START 3168404Spjd * 4168404Spjd * The contents of this file are subject to the terms of the 5168404Spjd * Common Development and Distribution License (the "License"). 6168404Spjd * You may not use this file except in compliance with the License. 7168404Spjd * 8168404Spjd * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9168404Spjd * or http://www.opensolaris.org/os/licensing. 10168404Spjd * See the License for the specific language governing permissions 11168404Spjd * and limitations under the License. 12168404Spjd * 13168404Spjd * When distributing Covered Code, include this CDDL HEADER in each 14168404Spjd * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15168404Spjd * If applicable, add the following below this CDDL HEADER, with the 16168404Spjd * fields enclosed by brackets "[]" replaced with your own identifying 17168404Spjd * information: Portions Copyright [yyyy] [name of copyright owner] 18168404Spjd * 19168404Spjd * CDDL HEADER END 20168404Spjd */ 21168404Spjd/* 22185029Spjd * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23168404Spjd * Use is subject to license terms. 24168404Spjd */ 25168404Spjd 26168404Spjd#include <sys/zfs_context.h> 27168404Spjd#include <sys/spa.h> 28168404Spjd#include <sys/dmu.h> 29168404Spjd#include <sys/zap.h> 30168404Spjd#include <sys/arc.h> 31168404Spjd#include <sys/stat.h> 32168404Spjd#include <sys/resource.h> 33168404Spjd#include <sys/zil.h> 34168404Spjd#include <sys/zil_impl.h> 35168404Spjd#include <sys/dsl_dataset.h> 36168404Spjd#include <sys/vdev.h> 37168404Spjd#include <sys/dmu_tx.h> 38168404Spjd 39168404Spjd/* 40168404Spjd * The zfs intent log (ZIL) saves transaction records of system calls 41168404Spjd * that change the file system in memory with enough information 42168404Spjd * to be able to replay them. These are stored in memory until 43168404Spjd * either the DMU transaction group (txg) commits them to the stable pool 44168404Spjd * and they can be discarded, or they are flushed to the stable log 45168404Spjd * (also in the pool) due to a fsync, O_DSYNC or other synchronous 46168404Spjd * requirement. In the event of a panic or power fail then those log 47168404Spjd * records (transactions) are replayed. 48168404Spjd * 49168404Spjd * There is one ZIL per file system. Its on-disk (pool) format consists 50168404Spjd * of 3 parts: 51168404Spjd * 52168404Spjd * - ZIL header 53168404Spjd * - ZIL blocks 54168404Spjd * - ZIL records 55168404Spjd * 56168404Spjd * A log record holds a system call transaction. Log blocks can 57168404Spjd * hold many log records and the blocks are chained together. 58168404Spjd * Each ZIL block contains a block pointer (blkptr_t) to the next 59168404Spjd * ZIL block in the chain. The ZIL header points to the first 60168404Spjd * block in the chain. Note there is not a fixed place in the pool 61168404Spjd * to hold blocks. They are dynamically allocated and freed as 62168404Spjd * needed from the blocks available. Figure X shows the ZIL structure: 63168404Spjd */ 64168404Spjd 65168404Spjd/* 66168404Spjd * This global ZIL switch affects all pools 67168404Spjd */ 68168404Spjdint zil_disable = 0; /* disable intent logging */ 69168404SpjdSYSCTL_DECL(_vfs_zfs); 70168404SpjdTUNABLE_INT("vfs.zfs.zil_disable", &zil_disable); 71169028SpjdSYSCTL_INT(_vfs_zfs, OID_AUTO, zil_disable, CTLFLAG_RW, &zil_disable, 0, 72168404Spjd "Disable ZFS Intent Log (ZIL)"); 73168404Spjd 74168404Spjd/* 75168404Spjd * Tunable parameter for debugging or performance analysis. Setting 76168404Spjd * zfs_nocacheflush will cause corruption on power loss if a volatile 77168404Spjd * out-of-order write cache is enabled. 78168404Spjd */ 79168404Spjdboolean_t zfs_nocacheflush = B_FALSE; 80168404SpjdTUNABLE_INT("vfs.zfs.cache_flush_disable", &zfs_nocacheflush); 81168404SpjdSYSCTL_INT(_vfs_zfs, OID_AUTO, cache_flush_disable, CTLFLAG_RDTUN, 82168404Spjd &zfs_nocacheflush, 0, "Disable cache flush"); 83168404Spjd 84168404Spjdstatic kmem_cache_t *zil_lwb_cache; 85168404Spjd 86168404Spjdstatic int 87168404Spjdzil_dva_compare(const void *x1, const void *x2) 88168404Spjd{ 89168404Spjd const dva_t *dva1 = x1; 90168404Spjd const dva_t *dva2 = x2; 91168404Spjd 92168404Spjd if (DVA_GET_VDEV(dva1) < DVA_GET_VDEV(dva2)) 93168404Spjd return (-1); 94168404Spjd if (DVA_GET_VDEV(dva1) > DVA_GET_VDEV(dva2)) 95168404Spjd return (1); 96168404Spjd 97168404Spjd if (DVA_GET_OFFSET(dva1) < DVA_GET_OFFSET(dva2)) 98168404Spjd return (-1); 99168404Spjd if (DVA_GET_OFFSET(dva1) > DVA_GET_OFFSET(dva2)) 100168404Spjd return (1); 101168404Spjd 102168404Spjd return (0); 103168404Spjd} 104168404Spjd 105168404Spjdstatic void 106168404Spjdzil_dva_tree_init(avl_tree_t *t) 107168404Spjd{ 108168404Spjd avl_create(t, zil_dva_compare, sizeof (zil_dva_node_t), 109168404Spjd offsetof(zil_dva_node_t, zn_node)); 110168404Spjd} 111168404Spjd 112168404Spjdstatic void 113168404Spjdzil_dva_tree_fini(avl_tree_t *t) 114168404Spjd{ 115168404Spjd zil_dva_node_t *zn; 116168404Spjd void *cookie = NULL; 117168404Spjd 118168404Spjd while ((zn = avl_destroy_nodes(t, &cookie)) != NULL) 119168404Spjd kmem_free(zn, sizeof (zil_dva_node_t)); 120168404Spjd 121168404Spjd avl_destroy(t); 122168404Spjd} 123168404Spjd 124168404Spjdstatic int 125168404Spjdzil_dva_tree_add(avl_tree_t *t, dva_t *dva) 126168404Spjd{ 127168404Spjd zil_dva_node_t *zn; 128168404Spjd avl_index_t where; 129168404Spjd 130168404Spjd if (avl_find(t, dva, &where) != NULL) 131168404Spjd return (EEXIST); 132168404Spjd 133168404Spjd zn = kmem_alloc(sizeof (zil_dva_node_t), KM_SLEEP); 134168404Spjd zn->zn_dva = *dva; 135168404Spjd avl_insert(t, zn, where); 136168404Spjd 137168404Spjd return (0); 138168404Spjd} 139168404Spjd 140168404Spjdstatic zil_header_t * 141168404Spjdzil_header_in_syncing_context(zilog_t *zilog) 142168404Spjd{ 143168404Spjd return ((zil_header_t *)zilog->zl_header); 144168404Spjd} 145168404Spjd 146168404Spjdstatic void 147168404Spjdzil_init_log_chain(zilog_t *zilog, blkptr_t *bp) 148168404Spjd{ 149168404Spjd zio_cksum_t *zc = &bp->blk_cksum; 150168404Spjd 151168404Spjd zc->zc_word[ZIL_ZC_GUID_0] = spa_get_random(-1ULL); 152168404Spjd zc->zc_word[ZIL_ZC_GUID_1] = spa_get_random(-1ULL); 153168404Spjd zc->zc_word[ZIL_ZC_OBJSET] = dmu_objset_id(zilog->zl_os); 154168404Spjd zc->zc_word[ZIL_ZC_SEQ] = 1ULL; 155168404Spjd} 156168404Spjd 157168404Spjd/* 158168404Spjd * Read a log block, make sure it's valid, and byteswap it if necessary. 159168404Spjd */ 160168404Spjdstatic int 161168404Spjdzil_read_log_block(zilog_t *zilog, const blkptr_t *bp, arc_buf_t **abufpp) 162168404Spjd{ 163168404Spjd blkptr_t blk = *bp; 164168404Spjd zbookmark_t zb; 165168404Spjd uint32_t aflags = ARC_WAIT; 166168404Spjd int error; 167168404Spjd 168168404Spjd zb.zb_objset = bp->blk_cksum.zc_word[ZIL_ZC_OBJSET]; 169168404Spjd zb.zb_object = 0; 170168404Spjd zb.zb_level = -1; 171168404Spjd zb.zb_blkid = bp->blk_cksum.zc_word[ZIL_ZC_SEQ]; 172168404Spjd 173168404Spjd *abufpp = NULL; 174168404Spjd 175185029Spjd /* 176185029Spjd * We shouldn't be doing any scrubbing while we're doing log 177185029Spjd * replay, it's OK to not lock. 178185029Spjd */ 179185029Spjd error = arc_read_nolock(NULL, zilog->zl_spa, &blk, 180168404Spjd arc_getbuf_func, abufpp, ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL | 181168404Spjd ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB, &aflags, &zb); 182168404Spjd 183168404Spjd if (error == 0) { 184168404Spjd char *data = (*abufpp)->b_data; 185168404Spjd uint64_t blksz = BP_GET_LSIZE(bp); 186168404Spjd zil_trailer_t *ztp = (zil_trailer_t *)(data + blksz) - 1; 187168404Spjd zio_cksum_t cksum = bp->blk_cksum; 188168404Spjd 189168404Spjd /* 190185029Spjd * Validate the checksummed log block. 191185029Spjd * 192168404Spjd * Sequence numbers should be... sequential. The checksum 193168404Spjd * verifier for the next block should be bp's checksum plus 1. 194185029Spjd * 195185029Spjd * Also check the log chain linkage and size used. 196168404Spjd */ 197168404Spjd cksum.zc_word[ZIL_ZC_SEQ]++; 198168404Spjd 199185029Spjd if (bcmp(&cksum, &ztp->zit_next_blk.blk_cksum, 200185029Spjd sizeof (cksum)) || BP_IS_HOLE(&ztp->zit_next_blk) || 201185029Spjd (ztp->zit_nused > (blksz - sizeof (zil_trailer_t)))) { 202185029Spjd error = ECKSUM; 203185029Spjd } 204168404Spjd 205168404Spjd if (error) { 206168404Spjd VERIFY(arc_buf_remove_ref(*abufpp, abufpp) == 1); 207168404Spjd *abufpp = NULL; 208168404Spjd } 209168404Spjd } 210168404Spjd 211168404Spjd dprintf("error %d on %llu:%llu\n", error, zb.zb_objset, zb.zb_blkid); 212168404Spjd 213168404Spjd return (error); 214168404Spjd} 215168404Spjd 216168404Spjd/* 217168404Spjd * Parse the intent log, and call parse_func for each valid record within. 218168404Spjd * Return the highest sequence number. 219168404Spjd */ 220168404Spjduint64_t 221168404Spjdzil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func, 222168404Spjd zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg) 223168404Spjd{ 224168404Spjd const zil_header_t *zh = zilog->zl_header; 225168404Spjd uint64_t claim_seq = zh->zh_claim_seq; 226168404Spjd uint64_t seq = 0; 227168404Spjd uint64_t max_seq = 0; 228168404Spjd blkptr_t blk = zh->zh_log; 229168404Spjd arc_buf_t *abuf; 230168404Spjd char *lrbuf, *lrp; 231168404Spjd zil_trailer_t *ztp; 232168404Spjd int reclen, error; 233168404Spjd 234168404Spjd if (BP_IS_HOLE(&blk)) 235168404Spjd return (max_seq); 236168404Spjd 237168404Spjd /* 238168404Spjd * Starting at the block pointed to by zh_log we read the log chain. 239168404Spjd * For each block in the chain we strongly check that block to 240168404Spjd * ensure its validity. We stop when an invalid block is found. 241168404Spjd * For each block pointer in the chain we call parse_blk_func(). 242168404Spjd * For each record in each valid block we call parse_lr_func(). 243168404Spjd * If the log has been claimed, stop if we encounter a sequence 244168404Spjd * number greater than the highest claimed sequence number. 245168404Spjd */ 246168404Spjd zil_dva_tree_init(&zilog->zl_dva_tree); 247168404Spjd for (;;) { 248168404Spjd seq = blk.blk_cksum.zc_word[ZIL_ZC_SEQ]; 249168404Spjd 250168404Spjd if (claim_seq != 0 && seq > claim_seq) 251168404Spjd break; 252168404Spjd 253168404Spjd ASSERT(max_seq < seq); 254168404Spjd max_seq = seq; 255168404Spjd 256168404Spjd error = zil_read_log_block(zilog, &blk, &abuf); 257168404Spjd 258168404Spjd if (parse_blk_func != NULL) 259168404Spjd parse_blk_func(zilog, &blk, arg, txg); 260168404Spjd 261168404Spjd if (error) 262168404Spjd break; 263168404Spjd 264168404Spjd lrbuf = abuf->b_data; 265168404Spjd ztp = (zil_trailer_t *)(lrbuf + BP_GET_LSIZE(&blk)) - 1; 266168404Spjd blk = ztp->zit_next_blk; 267168404Spjd 268168404Spjd if (parse_lr_func == NULL) { 269168404Spjd VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 270168404Spjd continue; 271168404Spjd } 272168404Spjd 273168404Spjd for (lrp = lrbuf; lrp < lrbuf + ztp->zit_nused; lrp += reclen) { 274168404Spjd lr_t *lr = (lr_t *)lrp; 275168404Spjd reclen = lr->lrc_reclen; 276168404Spjd ASSERT3U(reclen, >=, sizeof (lr_t)); 277168404Spjd parse_lr_func(zilog, lr, arg, txg); 278168404Spjd } 279168404Spjd VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 280168404Spjd } 281168404Spjd zil_dva_tree_fini(&zilog->zl_dva_tree); 282168404Spjd 283168404Spjd return (max_seq); 284168404Spjd} 285168404Spjd 286168404Spjd/* ARGSUSED */ 287168404Spjdstatic void 288168404Spjdzil_claim_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t first_txg) 289168404Spjd{ 290168404Spjd spa_t *spa = zilog->zl_spa; 291168404Spjd int err; 292168404Spjd 293168404Spjd /* 294168404Spjd * Claim log block if not already committed and not already claimed. 295168404Spjd */ 296168404Spjd if (bp->blk_birth >= first_txg && 297168404Spjd zil_dva_tree_add(&zilog->zl_dva_tree, BP_IDENTITY(bp)) == 0) { 298185029Spjd err = zio_wait(zio_claim(NULL, spa, first_txg, bp, NULL, NULL, 299185029Spjd ZIO_FLAG_MUSTSUCCEED)); 300168404Spjd ASSERT(err == 0); 301168404Spjd } 302168404Spjd} 303168404Spjd 304168404Spjdstatic void 305168404Spjdzil_claim_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t first_txg) 306168404Spjd{ 307168404Spjd if (lrc->lrc_txtype == TX_WRITE) { 308168404Spjd lr_write_t *lr = (lr_write_t *)lrc; 309168404Spjd zil_claim_log_block(zilog, &lr->lr_blkptr, tx, first_txg); 310168404Spjd } 311168404Spjd} 312168404Spjd 313168404Spjd/* ARGSUSED */ 314168404Spjdstatic void 315168404Spjdzil_free_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t claim_txg) 316168404Spjd{ 317168404Spjd zio_free_blk(zilog->zl_spa, bp, dmu_tx_get_txg(tx)); 318168404Spjd} 319168404Spjd 320168404Spjdstatic void 321168404Spjdzil_free_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t claim_txg) 322168404Spjd{ 323168404Spjd /* 324168404Spjd * If we previously claimed it, we need to free it. 325168404Spjd */ 326168404Spjd if (claim_txg != 0 && lrc->lrc_txtype == TX_WRITE) { 327168404Spjd lr_write_t *lr = (lr_write_t *)lrc; 328168404Spjd blkptr_t *bp = &lr->lr_blkptr; 329168404Spjd if (bp->blk_birth >= claim_txg && 330168404Spjd !zil_dva_tree_add(&zilog->zl_dva_tree, BP_IDENTITY(bp))) { 331168404Spjd (void) arc_free(NULL, zilog->zl_spa, 332168404Spjd dmu_tx_get_txg(tx), bp, NULL, NULL, ARC_WAIT); 333168404Spjd } 334168404Spjd } 335168404Spjd} 336168404Spjd 337168404Spjd/* 338168404Spjd * Create an on-disk intent log. 339168404Spjd */ 340168404Spjdstatic void 341168404Spjdzil_create(zilog_t *zilog) 342168404Spjd{ 343168404Spjd const zil_header_t *zh = zilog->zl_header; 344168404Spjd lwb_t *lwb; 345168404Spjd uint64_t txg = 0; 346168404Spjd dmu_tx_t *tx = NULL; 347168404Spjd blkptr_t blk; 348168404Spjd int error = 0; 349168404Spjd 350168404Spjd /* 351168404Spjd * Wait for any previous destroy to complete. 352168404Spjd */ 353168404Spjd txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); 354168404Spjd 355168404Spjd ASSERT(zh->zh_claim_txg == 0); 356168404Spjd ASSERT(zh->zh_replay_seq == 0); 357168404Spjd 358168404Spjd blk = zh->zh_log; 359168404Spjd 360168404Spjd /* 361168404Spjd * If we don't already have an initial log block, allocate one now. 362168404Spjd */ 363168404Spjd if (BP_IS_HOLE(&blk)) { 364168404Spjd tx = dmu_tx_create(zilog->zl_os); 365168404Spjd (void) dmu_tx_assign(tx, TXG_WAIT); 366168404Spjd dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 367168404Spjd txg = dmu_tx_get_txg(tx); 368168404Spjd 369168404Spjd error = zio_alloc_blk(zilog->zl_spa, ZIL_MIN_BLKSZ, &blk, 370168404Spjd NULL, txg); 371168404Spjd 372168404Spjd if (error == 0) 373168404Spjd zil_init_log_chain(zilog, &blk); 374168404Spjd } 375168404Spjd 376168404Spjd /* 377168404Spjd * Allocate a log write buffer (lwb) for the first log block. 378168404Spjd */ 379168404Spjd if (error == 0) { 380168404Spjd lwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP); 381168404Spjd lwb->lwb_zilog = zilog; 382168404Spjd lwb->lwb_blk = blk; 383168404Spjd lwb->lwb_nused = 0; 384168404Spjd lwb->lwb_sz = BP_GET_LSIZE(&lwb->lwb_blk); 385168404Spjd lwb->lwb_buf = zio_buf_alloc(lwb->lwb_sz); 386168404Spjd lwb->lwb_max_txg = txg; 387168404Spjd lwb->lwb_zio = NULL; 388168404Spjd 389168404Spjd mutex_enter(&zilog->zl_lock); 390168404Spjd list_insert_tail(&zilog->zl_lwb_list, lwb); 391168404Spjd mutex_exit(&zilog->zl_lock); 392168404Spjd } 393168404Spjd 394168404Spjd /* 395168404Spjd * If we just allocated the first log block, commit our transaction 396168404Spjd * and wait for zil_sync() to stuff the block poiner into zh_log. 397168404Spjd * (zh is part of the MOS, so we cannot modify it in open context.) 398168404Spjd */ 399168404Spjd if (tx != NULL) { 400168404Spjd dmu_tx_commit(tx); 401168404Spjd txg_wait_synced(zilog->zl_dmu_pool, txg); 402168404Spjd } 403168404Spjd 404168404Spjd ASSERT(bcmp(&blk, &zh->zh_log, sizeof (blk)) == 0); 405168404Spjd} 406168404Spjd 407168404Spjd/* 408168404Spjd * In one tx, free all log blocks and clear the log header. 409168404Spjd * If keep_first is set, then we're replaying a log with no content. 410168404Spjd * We want to keep the first block, however, so that the first 411168404Spjd * synchronous transaction doesn't require a txg_wait_synced() 412168404Spjd * in zil_create(). We don't need to txg_wait_synced() here either 413168404Spjd * when keep_first is set, because both zil_create() and zil_destroy() 414168404Spjd * will wait for any in-progress destroys to complete. 415168404Spjd */ 416168404Spjdvoid 417168404Spjdzil_destroy(zilog_t *zilog, boolean_t keep_first) 418168404Spjd{ 419168404Spjd const zil_header_t *zh = zilog->zl_header; 420168404Spjd lwb_t *lwb; 421168404Spjd dmu_tx_t *tx; 422168404Spjd uint64_t txg; 423168404Spjd 424168404Spjd /* 425168404Spjd * Wait for any previous destroy to complete. 426168404Spjd */ 427168404Spjd txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); 428168404Spjd 429168404Spjd if (BP_IS_HOLE(&zh->zh_log)) 430168404Spjd return; 431168404Spjd 432168404Spjd tx = dmu_tx_create(zilog->zl_os); 433168404Spjd (void) dmu_tx_assign(tx, TXG_WAIT); 434168404Spjd dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 435168404Spjd txg = dmu_tx_get_txg(tx); 436168404Spjd 437168404Spjd mutex_enter(&zilog->zl_lock); 438168404Spjd 439185029Spjd /* 440185029Spjd * It is possible for the ZIL to get the previously mounted zilog 441185029Spjd * structure of the same dataset if quickly remounted and the dbuf 442185029Spjd * eviction has not completed. In this case we can see a non 443185029Spjd * empty lwb list and keep_first will be set. We fix this by 444185029Spjd * clearing the keep_first. This will be slower but it's very rare. 445185029Spjd */ 446185029Spjd if (!list_is_empty(&zilog->zl_lwb_list) && keep_first) 447185029Spjd keep_first = B_FALSE; 448185029Spjd 449168404Spjd ASSERT3U(zilog->zl_destroy_txg, <, txg); 450168404Spjd zilog->zl_destroy_txg = txg; 451168404Spjd zilog->zl_keep_first = keep_first; 452168404Spjd 453168404Spjd if (!list_is_empty(&zilog->zl_lwb_list)) { 454168404Spjd ASSERT(zh->zh_claim_txg == 0); 455168404Spjd ASSERT(!keep_first); 456168404Spjd while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) { 457168404Spjd list_remove(&zilog->zl_lwb_list, lwb); 458168404Spjd if (lwb->lwb_buf != NULL) 459168404Spjd zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); 460168404Spjd zio_free_blk(zilog->zl_spa, &lwb->lwb_blk, txg); 461168404Spjd kmem_cache_free(zil_lwb_cache, lwb); 462168404Spjd } 463168404Spjd } else { 464168404Spjd if (!keep_first) { 465168404Spjd (void) zil_parse(zilog, zil_free_log_block, 466168404Spjd zil_free_log_record, tx, zh->zh_claim_txg); 467168404Spjd } 468168404Spjd } 469168404Spjd mutex_exit(&zilog->zl_lock); 470168404Spjd 471168404Spjd dmu_tx_commit(tx); 472185029Spjd} 473168404Spjd 474185029Spjd/* 475185029Spjd * zil_rollback_destroy() is only called by the rollback code. 476185029Spjd * We already have a syncing tx. Rollback has exclusive access to the 477185029Spjd * dataset, so we don't have to worry about concurrent zil access. 478185029Spjd * The actual freeing of any log blocks occurs in zil_sync() later in 479185029Spjd * this txg syncing phase. 480185029Spjd */ 481185029Spjdvoid 482185029Spjdzil_rollback_destroy(zilog_t *zilog, dmu_tx_t *tx) 483185029Spjd{ 484185029Spjd const zil_header_t *zh = zilog->zl_header; 485185029Spjd uint64_t txg; 486185029Spjd 487185029Spjd if (BP_IS_HOLE(&zh->zh_log)) 488168404Spjd return; 489168404Spjd 490185029Spjd txg = dmu_tx_get_txg(tx); 491185029Spjd ASSERT3U(zilog->zl_destroy_txg, <, txg); 492185029Spjd zilog->zl_destroy_txg = txg; 493185029Spjd zilog->zl_keep_first = B_FALSE; 494185029Spjd 495185029Spjd /* 496185029Spjd * Ensure there's no outstanding ZIL IO. No lwbs or just the 497185029Spjd * unused one that allocated in advance is ok. 498185029Spjd */ 499185029Spjd ASSERT(zilog->zl_lwb_list.list_head.list_next == 500185029Spjd zilog->zl_lwb_list.list_head.list_prev); 501185029Spjd (void) zil_parse(zilog, zil_free_log_block, zil_free_log_record, 502185029Spjd tx, zh->zh_claim_txg); 503168404Spjd} 504168404Spjd 505200724Sdelphij/* 506200724Sdelphij * return true if the initial log block is not valid 507200724Sdelphij */ 508200724Sdelphijstatic boolean_t 509200724Sdelphijzil_empty(zilog_t *zilog) 510200724Sdelphij{ 511200724Sdelphij const zil_header_t *zh = zilog->zl_header; 512200724Sdelphij arc_buf_t *abuf = NULL; 513200724Sdelphij 514200724Sdelphij if (BP_IS_HOLE(&zh->zh_log)) 515200724Sdelphij return (B_TRUE); 516200724Sdelphij 517200724Sdelphij if (zil_read_log_block(zilog, &zh->zh_log, &abuf) != 0) 518200724Sdelphij return (B_TRUE); 519200724Sdelphij 520200724Sdelphij VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 521200724Sdelphij return (B_FALSE); 522200724Sdelphij} 523200724Sdelphij 524168404Spjdint 525168404Spjdzil_claim(char *osname, void *txarg) 526168404Spjd{ 527168404Spjd dmu_tx_t *tx = txarg; 528168404Spjd uint64_t first_txg = dmu_tx_get_txg(tx); 529168404Spjd zilog_t *zilog; 530168404Spjd zil_header_t *zh; 531168404Spjd objset_t *os; 532168404Spjd int error; 533168404Spjd 534185029Spjd error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os); 535168404Spjd if (error) { 536185029Spjd cmn_err(CE_WARN, "can't open objset for %s", osname); 537168404Spjd return (0); 538168404Spjd } 539168404Spjd 540168404Spjd zilog = dmu_objset_zil(os); 541168404Spjd zh = zil_header_in_syncing_context(zilog); 542168404Spjd 543168404Spjd /* 544200724Sdelphij * Record here whether the zil has any records to replay. 545200724Sdelphij * If the header block pointer is null or the block points 546200724Sdelphij * to the stubby then we know there are no valid log records. 547200724Sdelphij * We use the header to store this state as the the zilog gets 548200724Sdelphij * freed later in dmu_objset_close(). 549200724Sdelphij * The flags (and the rest of the header fields) are cleared in 550200724Sdelphij * zil_sync() as a result of a zil_destroy(), after replaying the log. 551200724Sdelphij * 552200724Sdelphij * Note, the intent log can be empty but still need the 553200724Sdelphij * stubby to be claimed. 554200724Sdelphij */ 555200724Sdelphij if (!zil_empty(zilog)) 556200724Sdelphij zh->zh_flags |= ZIL_REPLAY_NEEDED; 557200724Sdelphij 558200724Sdelphij /* 559168404Spjd * Claim all log blocks if we haven't already done so, and remember 560168404Spjd * the highest claimed sequence number. This ensures that if we can 561168404Spjd * read only part of the log now (e.g. due to a missing device), 562168404Spjd * but we can read the entire log later, we will not try to replay 563168404Spjd * or destroy beyond the last block we successfully claimed. 564168404Spjd */ 565168404Spjd ASSERT3U(zh->zh_claim_txg, <=, first_txg); 566168404Spjd if (zh->zh_claim_txg == 0 && !BP_IS_HOLE(&zh->zh_log)) { 567168404Spjd zh->zh_claim_txg = first_txg; 568168404Spjd zh->zh_claim_seq = zil_parse(zilog, zil_claim_log_block, 569168404Spjd zil_claim_log_record, tx, first_txg); 570168404Spjd dsl_dataset_dirty(dmu_objset_ds(os), tx); 571168404Spjd } 572168404Spjd 573168404Spjd ASSERT3U(first_txg, ==, (spa_last_synced_txg(zilog->zl_spa) + 1)); 574168404Spjd dmu_objset_close(os); 575168404Spjd return (0); 576168404Spjd} 577168404Spjd 578185029Spjd/* 579185029Spjd * Check the log by walking the log chain. 580185029Spjd * Checksum errors are ok as they indicate the end of the chain. 581185029Spjd * Any other error (no device or read failure) returns an error. 582185029Spjd */ 583185029Spjd/* ARGSUSED */ 584185029Spjdint 585185029Spjdzil_check_log_chain(char *osname, void *txarg) 586168404Spjd{ 587185029Spjd zilog_t *zilog; 588185029Spjd zil_header_t *zh; 589185029Spjd blkptr_t blk; 590185029Spjd arc_buf_t *abuf; 591185029Spjd objset_t *os; 592185029Spjd char *lrbuf; 593185029Spjd zil_trailer_t *ztp; 594185029Spjd int error; 595168404Spjd 596185029Spjd error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os); 597185029Spjd if (error) { 598185029Spjd cmn_err(CE_WARN, "can't open objset for %s", osname); 599185029Spjd return (0); 600185029Spjd } 601168404Spjd 602185029Spjd zilog = dmu_objset_zil(os); 603185029Spjd zh = zil_header_in_syncing_context(zilog); 604185029Spjd blk = zh->zh_log; 605185029Spjd if (BP_IS_HOLE(&blk)) { 606185029Spjd dmu_objset_close(os); 607185029Spjd return (0); /* no chain */ 608168404Spjd } 609185029Spjd 610185029Spjd for (;;) { 611185029Spjd error = zil_read_log_block(zilog, &blk, &abuf); 612185029Spjd if (error) 613185029Spjd break; 614185029Spjd lrbuf = abuf->b_data; 615185029Spjd ztp = (zil_trailer_t *)(lrbuf + BP_GET_LSIZE(&blk)) - 1; 616185029Spjd blk = ztp->zit_next_blk; 617185029Spjd VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 618185029Spjd } 619185029Spjd dmu_objset_close(os); 620185029Spjd if (error == ECKSUM) 621185029Spjd return (0); /* normal end of chain */ 622185029Spjd return (error); 623168404Spjd} 624168404Spjd 625185029Spjd/* 626185029Spjd * Clear a log chain 627185029Spjd */ 628185029Spjd/* ARGSUSED */ 629185029Spjdint 630185029Spjdzil_clear_log_chain(char *osname, void *txarg) 631185029Spjd{ 632185029Spjd zilog_t *zilog; 633185029Spjd zil_header_t *zh; 634185029Spjd objset_t *os; 635185029Spjd dmu_tx_t *tx; 636185029Spjd int error; 637185029Spjd 638185029Spjd error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os); 639185029Spjd if (error) { 640185029Spjd cmn_err(CE_WARN, "can't open objset for %s", osname); 641185029Spjd return (0); 642185029Spjd } 643185029Spjd 644185029Spjd zilog = dmu_objset_zil(os); 645185029Spjd tx = dmu_tx_create(zilog->zl_os); 646185029Spjd (void) dmu_tx_assign(tx, TXG_WAIT); 647185029Spjd zh = zil_header_in_syncing_context(zilog); 648185029Spjd BP_ZERO(&zh->zh_log); 649185029Spjd dsl_dataset_dirty(dmu_objset_ds(os), tx); 650185029Spjd dmu_tx_commit(tx); 651185029Spjd dmu_objset_close(os); 652185029Spjd return (0); 653185029Spjd} 654185029Spjd 655185029Spjdstatic int 656185029Spjdzil_vdev_compare(const void *x1, const void *x2) 657185029Spjd{ 658185029Spjd uint64_t v1 = ((zil_vdev_node_t *)x1)->zv_vdev; 659185029Spjd uint64_t v2 = ((zil_vdev_node_t *)x2)->zv_vdev; 660185029Spjd 661185029Spjd if (v1 < v2) 662185029Spjd return (-1); 663185029Spjd if (v1 > v2) 664185029Spjd return (1); 665185029Spjd 666185029Spjd return (0); 667185029Spjd} 668185029Spjd 669168404Spjdvoid 670185029Spjdzil_add_block(zilog_t *zilog, blkptr_t *bp) 671168404Spjd{ 672185029Spjd avl_tree_t *t = &zilog->zl_vdev_tree; 673185029Spjd avl_index_t where; 674185029Spjd zil_vdev_node_t *zv, zvsearch; 675185029Spjd int ndvas = BP_GET_NDVAS(bp); 676185029Spjd int i; 677168404Spjd 678185029Spjd if (zfs_nocacheflush) 679185029Spjd return; 680168404Spjd 681185029Spjd ASSERT(zilog->zl_writer); 682168404Spjd 683185029Spjd /* 684185029Spjd * Even though we're zl_writer, we still need a lock because the 685185029Spjd * zl_get_data() callbacks may have dmu_sync() done callbacks 686185029Spjd * that will run concurrently. 687185029Spjd */ 688185029Spjd mutex_enter(&zilog->zl_vdev_lock); 689185029Spjd for (i = 0; i < ndvas; i++) { 690185029Spjd zvsearch.zv_vdev = DVA_GET_VDEV(&bp->blk_dva[i]); 691185029Spjd if (avl_find(t, &zvsearch, &where) == NULL) { 692185029Spjd zv = kmem_alloc(sizeof (*zv), KM_SLEEP); 693185029Spjd zv->zv_vdev = zvsearch.zv_vdev; 694185029Spjd avl_insert(t, zv, where); 695185029Spjd } 696185029Spjd } 697185029Spjd mutex_exit(&zilog->zl_vdev_lock); 698168404Spjd} 699168404Spjd 700168404Spjdvoid 701168404Spjdzil_flush_vdevs(zilog_t *zilog) 702168404Spjd{ 703168404Spjd spa_t *spa = zilog->zl_spa; 704185029Spjd avl_tree_t *t = &zilog->zl_vdev_tree; 705185029Spjd void *cookie = NULL; 706185029Spjd zil_vdev_node_t *zv; 707185029Spjd zio_t *zio; 708168404Spjd 709168404Spjd ASSERT(zilog->zl_writer); 710168404Spjd 711185029Spjd /* 712185029Spjd * We don't need zl_vdev_lock here because we're the zl_writer, 713185029Spjd * and all zl_get_data() callbacks are done. 714185029Spjd */ 715185029Spjd if (avl_numnodes(t) == 0) 716185029Spjd return; 717185029Spjd 718185029Spjd spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 719185029Spjd 720185029Spjd zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 721185029Spjd 722185029Spjd while ((zv = avl_destroy_nodes(t, &cookie)) != NULL) { 723185029Spjd vdev_t *vd = vdev_lookup_top(spa, zv->zv_vdev); 724185029Spjd if (vd != NULL) 725185029Spjd zio_flush(zio, vd); 726185029Spjd kmem_free(zv, sizeof (*zv)); 727168404Spjd } 728168404Spjd 729168404Spjd /* 730168404Spjd * Wait for all the flushes to complete. Not all devices actually 731168404Spjd * support the DKIOCFLUSHWRITECACHE ioctl, so it's OK if it fails. 732168404Spjd */ 733185029Spjd (void) zio_wait(zio); 734185029Spjd 735185029Spjd spa_config_exit(spa, SCL_STATE, FTAG); 736168404Spjd} 737168404Spjd 738168404Spjd/* 739168404Spjd * Function called when a log block write completes 740168404Spjd */ 741168404Spjdstatic void 742168404Spjdzil_lwb_write_done(zio_t *zio) 743168404Spjd{ 744168404Spjd lwb_t *lwb = zio->io_private; 745168404Spjd zilog_t *zilog = lwb->lwb_zilog; 746168404Spjd 747185029Spjd ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); 748185029Spjd ASSERT(BP_GET_CHECKSUM(zio->io_bp) == ZIO_CHECKSUM_ZILOG); 749185029Spjd ASSERT(BP_GET_TYPE(zio->io_bp) == DMU_OT_INTENT_LOG); 750185029Spjd ASSERT(BP_GET_LEVEL(zio->io_bp) == 0); 751185029Spjd ASSERT(BP_GET_BYTEORDER(zio->io_bp) == ZFS_HOST_BYTEORDER); 752185029Spjd ASSERT(!BP_IS_GANG(zio->io_bp)); 753185029Spjd ASSERT(!BP_IS_HOLE(zio->io_bp)); 754185029Spjd ASSERT(zio->io_bp->blk_fill == 0); 755185029Spjd 756168404Spjd /* 757168404Spjd * Now that we've written this log block, we have a stable pointer 758168404Spjd * to the next block in the chain, so it's OK to let the txg in 759168404Spjd * which we allocated the next block sync. 760168404Spjd */ 761168404Spjd txg_rele_to_sync(&lwb->lwb_txgh); 762168404Spjd 763168404Spjd zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); 764168404Spjd mutex_enter(&zilog->zl_lock); 765168404Spjd lwb->lwb_buf = NULL; 766185029Spjd if (zio->io_error) 767168404Spjd zilog->zl_log_error = B_TRUE; 768168404Spjd mutex_exit(&zilog->zl_lock); 769168404Spjd} 770168404Spjd 771168404Spjd/* 772168404Spjd * Initialize the io for a log block. 773168404Spjd */ 774168404Spjdstatic void 775168404Spjdzil_lwb_write_init(zilog_t *zilog, lwb_t *lwb) 776168404Spjd{ 777168404Spjd zbookmark_t zb; 778168404Spjd 779168404Spjd zb.zb_objset = lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_OBJSET]; 780168404Spjd zb.zb_object = 0; 781168404Spjd zb.zb_level = -1; 782168404Spjd zb.zb_blkid = lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_SEQ]; 783168404Spjd 784168404Spjd if (zilog->zl_root_zio == NULL) { 785168404Spjd zilog->zl_root_zio = zio_root(zilog->zl_spa, NULL, NULL, 786168404Spjd ZIO_FLAG_CANFAIL); 787168404Spjd } 788168404Spjd if (lwb->lwb_zio == NULL) { 789168404Spjd lwb->lwb_zio = zio_rewrite(zilog->zl_root_zio, zilog->zl_spa, 790185029Spjd 0, &lwb->lwb_blk, lwb->lwb_buf, 791168404Spjd lwb->lwb_sz, zil_lwb_write_done, lwb, 792185029Spjd ZIO_PRIORITY_LOG_WRITE, ZIO_FLAG_CANFAIL, &zb); 793168404Spjd } 794168404Spjd} 795168404Spjd 796168404Spjd/* 797168404Spjd * Start a log block write and advance to the next log block. 798168404Spjd * Calls are serialized. 799168404Spjd */ 800168404Spjdstatic lwb_t * 801168404Spjdzil_lwb_write_start(zilog_t *zilog, lwb_t *lwb) 802168404Spjd{ 803168404Spjd lwb_t *nlwb; 804168404Spjd zil_trailer_t *ztp = (zil_trailer_t *)(lwb->lwb_buf + lwb->lwb_sz) - 1; 805168404Spjd spa_t *spa = zilog->zl_spa; 806168404Spjd blkptr_t *bp = &ztp->zit_next_blk; 807168404Spjd uint64_t txg; 808168404Spjd uint64_t zil_blksz; 809168404Spjd int error; 810168404Spjd 811168404Spjd ASSERT(lwb->lwb_nused <= ZIL_BLK_DATA_SZ(lwb)); 812168404Spjd 813168404Spjd /* 814168404Spjd * Allocate the next block and save its address in this block 815168404Spjd * before writing it in order to establish the log chain. 816168404Spjd * Note that if the allocation of nlwb synced before we wrote 817168404Spjd * the block that points at it (lwb), we'd leak it if we crashed. 818168404Spjd * Therefore, we don't do txg_rele_to_sync() until zil_lwb_write_done(). 819168404Spjd */ 820168404Spjd txg = txg_hold_open(zilog->zl_dmu_pool, &lwb->lwb_txgh); 821168404Spjd txg_rele_to_quiesce(&lwb->lwb_txgh); 822168404Spjd 823168404Spjd /* 824168404Spjd * Pick a ZIL blocksize. We request a size that is the 825168404Spjd * maximum of the previous used size, the current used size and 826168404Spjd * the amount waiting in the queue. 827168404Spjd */ 828168404Spjd zil_blksz = MAX(zilog->zl_prev_used, 829168404Spjd zilog->zl_cur_used + sizeof (*ztp)); 830168404Spjd zil_blksz = MAX(zil_blksz, zilog->zl_itx_list_sz + sizeof (*ztp)); 831168404Spjd zil_blksz = P2ROUNDUP_TYPED(zil_blksz, ZIL_MIN_BLKSZ, uint64_t); 832168404Spjd if (zil_blksz > ZIL_MAX_BLKSZ) 833168404Spjd zil_blksz = ZIL_MAX_BLKSZ; 834168404Spjd 835168404Spjd BP_ZERO(bp); 836168404Spjd /* pass the old blkptr in order to spread log blocks across devs */ 837168404Spjd error = zio_alloc_blk(spa, zil_blksz, bp, &lwb->lwb_blk, txg); 838168404Spjd if (error) { 839168404Spjd dmu_tx_t *tx = dmu_tx_create_assigned(zilog->zl_dmu_pool, txg); 840168404Spjd 841168404Spjd /* 842168404Spjd * We dirty the dataset to ensure that zil_sync() will 843168404Spjd * be called to remove this lwb from our zl_lwb_list. 844168404Spjd * Failing to do so, may leave an lwb with a NULL lwb_buf 845168404Spjd * hanging around on the zl_lwb_list. 846168404Spjd */ 847168404Spjd dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 848168404Spjd dmu_tx_commit(tx); 849168404Spjd 850168404Spjd /* 851168404Spjd * Since we've just experienced an allocation failure so we 852168404Spjd * terminate the current lwb and send it on its way. 853168404Spjd */ 854168404Spjd ztp->zit_pad = 0; 855168404Spjd ztp->zit_nused = lwb->lwb_nused; 856168404Spjd ztp->zit_bt.zbt_cksum = lwb->lwb_blk.blk_cksum; 857168404Spjd zio_nowait(lwb->lwb_zio); 858168404Spjd 859168404Spjd /* 860168404Spjd * By returning NULL the caller will call tx_wait_synced() 861168404Spjd */ 862168404Spjd return (NULL); 863168404Spjd } 864168404Spjd 865168404Spjd ASSERT3U(bp->blk_birth, ==, txg); 866168404Spjd ztp->zit_pad = 0; 867168404Spjd ztp->zit_nused = lwb->lwb_nused; 868168404Spjd ztp->zit_bt.zbt_cksum = lwb->lwb_blk.blk_cksum; 869168404Spjd bp->blk_cksum = lwb->lwb_blk.blk_cksum; 870168404Spjd bp->blk_cksum.zc_word[ZIL_ZC_SEQ]++; 871168404Spjd 872168404Spjd /* 873168404Spjd * Allocate a new log write buffer (lwb). 874168404Spjd */ 875168404Spjd nlwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP); 876168404Spjd 877168404Spjd nlwb->lwb_zilog = zilog; 878168404Spjd nlwb->lwb_blk = *bp; 879168404Spjd nlwb->lwb_nused = 0; 880168404Spjd nlwb->lwb_sz = BP_GET_LSIZE(&nlwb->lwb_blk); 881168404Spjd nlwb->lwb_buf = zio_buf_alloc(nlwb->lwb_sz); 882168404Spjd nlwb->lwb_max_txg = txg; 883168404Spjd nlwb->lwb_zio = NULL; 884168404Spjd 885168404Spjd /* 886168404Spjd * Put new lwb at the end of the log chain 887168404Spjd */ 888168404Spjd mutex_enter(&zilog->zl_lock); 889168404Spjd list_insert_tail(&zilog->zl_lwb_list, nlwb); 890168404Spjd mutex_exit(&zilog->zl_lock); 891168404Spjd 892185029Spjd /* Record the block for later vdev flushing */ 893185029Spjd zil_add_block(zilog, &lwb->lwb_blk); 894168404Spjd 895168404Spjd /* 896168404Spjd * kick off the write for the old log block 897168404Spjd */ 898168404Spjd dprintf_bp(&lwb->lwb_blk, "lwb %p txg %llu: ", lwb, txg); 899168404Spjd ASSERT(lwb->lwb_zio); 900168404Spjd zio_nowait(lwb->lwb_zio); 901168404Spjd 902168404Spjd return (nlwb); 903168404Spjd} 904168404Spjd 905168404Spjdstatic lwb_t * 906168404Spjdzil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb) 907168404Spjd{ 908168404Spjd lr_t *lrc = &itx->itx_lr; /* common log record */ 909168404Spjd lr_write_t *lr = (lr_write_t *)lrc; 910168404Spjd uint64_t txg = lrc->lrc_txg; 911168404Spjd uint64_t reclen = lrc->lrc_reclen; 912168404Spjd uint64_t dlen; 913168404Spjd 914168404Spjd if (lwb == NULL) 915168404Spjd return (NULL); 916168404Spjd ASSERT(lwb->lwb_buf != NULL); 917168404Spjd 918168404Spjd if (lrc->lrc_txtype == TX_WRITE && itx->itx_wr_state == WR_NEED_COPY) 919168404Spjd dlen = P2ROUNDUP_TYPED( 920168404Spjd lr->lr_length, sizeof (uint64_t), uint64_t); 921168404Spjd else 922168404Spjd dlen = 0; 923168404Spjd 924168404Spjd zilog->zl_cur_used += (reclen + dlen); 925168404Spjd 926168404Spjd zil_lwb_write_init(zilog, lwb); 927168404Spjd 928168404Spjd /* 929168404Spjd * If this record won't fit in the current log block, start a new one. 930168404Spjd */ 931168404Spjd if (lwb->lwb_nused + reclen + dlen > ZIL_BLK_DATA_SZ(lwb)) { 932168404Spjd lwb = zil_lwb_write_start(zilog, lwb); 933168404Spjd if (lwb == NULL) 934168404Spjd return (NULL); 935168404Spjd zil_lwb_write_init(zilog, lwb); 936168404Spjd ASSERT(lwb->lwb_nused == 0); 937168404Spjd if (reclen + dlen > ZIL_BLK_DATA_SZ(lwb)) { 938168404Spjd txg_wait_synced(zilog->zl_dmu_pool, txg); 939168404Spjd return (lwb); 940168404Spjd } 941168404Spjd } 942168404Spjd 943168404Spjd /* 944168404Spjd * Update the lrc_seq, to be log record sequence number. See zil.h 945168404Spjd * Then copy the record to the log buffer. 946168404Spjd */ 947168404Spjd lrc->lrc_seq = ++zilog->zl_lr_seq; /* we are single threaded */ 948168404Spjd bcopy(lrc, lwb->lwb_buf + lwb->lwb_nused, reclen); 949168404Spjd 950168404Spjd /* 951168404Spjd * If it's a write, fetch the data or get its blkptr as appropriate. 952168404Spjd */ 953168404Spjd if (lrc->lrc_txtype == TX_WRITE) { 954168404Spjd if (txg > spa_freeze_txg(zilog->zl_spa)) 955168404Spjd txg_wait_synced(zilog->zl_dmu_pool, txg); 956168404Spjd if (itx->itx_wr_state != WR_COPIED) { 957168404Spjd char *dbuf; 958168404Spjd int error; 959168404Spjd 960168404Spjd /* alignment is guaranteed */ 961168404Spjd lr = (lr_write_t *)(lwb->lwb_buf + lwb->lwb_nused); 962168404Spjd if (dlen) { 963168404Spjd ASSERT(itx->itx_wr_state == WR_NEED_COPY); 964168404Spjd dbuf = lwb->lwb_buf + lwb->lwb_nused + reclen; 965168404Spjd lr->lr_common.lrc_reclen += dlen; 966168404Spjd } else { 967168404Spjd ASSERT(itx->itx_wr_state == WR_INDIRECT); 968168404Spjd dbuf = NULL; 969168404Spjd } 970168404Spjd error = zilog->zl_get_data( 971168404Spjd itx->itx_private, lr, dbuf, lwb->lwb_zio); 972168404Spjd if (error) { 973168404Spjd ASSERT(error == ENOENT || error == EEXIST || 974168404Spjd error == EALREADY); 975168404Spjd return (lwb); 976168404Spjd } 977168404Spjd } 978168404Spjd } 979168404Spjd 980168404Spjd lwb->lwb_nused += reclen + dlen; 981168404Spjd lwb->lwb_max_txg = MAX(lwb->lwb_max_txg, txg); 982168404Spjd ASSERT3U(lwb->lwb_nused, <=, ZIL_BLK_DATA_SZ(lwb)); 983168404Spjd ASSERT3U(P2PHASE(lwb->lwb_nused, sizeof (uint64_t)), ==, 0); 984168404Spjd 985168404Spjd return (lwb); 986168404Spjd} 987168404Spjd 988168404Spjditx_t * 989185029Spjdzil_itx_create(uint64_t txtype, size_t lrsize) 990168404Spjd{ 991168404Spjd itx_t *itx; 992168404Spjd 993168404Spjd lrsize = P2ROUNDUP_TYPED(lrsize, sizeof (uint64_t), size_t); 994168404Spjd 995168404Spjd itx = kmem_alloc(offsetof(itx_t, itx_lr) + lrsize, KM_SLEEP); 996168404Spjd itx->itx_lr.lrc_txtype = txtype; 997168404Spjd itx->itx_lr.lrc_reclen = lrsize; 998185029Spjd itx->itx_sod = lrsize; /* if write & WR_NEED_COPY will be increased */ 999168404Spjd itx->itx_lr.lrc_seq = 0; /* defensive */ 1000168404Spjd 1001168404Spjd return (itx); 1002168404Spjd} 1003168404Spjd 1004168404Spjduint64_t 1005168404Spjdzil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx) 1006168404Spjd{ 1007168404Spjd uint64_t seq; 1008168404Spjd 1009168404Spjd ASSERT(itx->itx_lr.lrc_seq == 0); 1010168404Spjd 1011168404Spjd mutex_enter(&zilog->zl_lock); 1012168404Spjd list_insert_tail(&zilog->zl_itx_list, itx); 1013185029Spjd zilog->zl_itx_list_sz += itx->itx_sod; 1014168404Spjd itx->itx_lr.lrc_txg = dmu_tx_get_txg(tx); 1015168404Spjd itx->itx_lr.lrc_seq = seq = ++zilog->zl_itx_seq; 1016168404Spjd mutex_exit(&zilog->zl_lock); 1017168404Spjd 1018168404Spjd return (seq); 1019168404Spjd} 1020168404Spjd 1021168404Spjd/* 1022168404Spjd * Free up all in-memory intent log transactions that have now been synced. 1023168404Spjd */ 1024168404Spjdstatic void 1025168404Spjdzil_itx_clean(zilog_t *zilog) 1026168404Spjd{ 1027168404Spjd uint64_t synced_txg = spa_last_synced_txg(zilog->zl_spa); 1028168404Spjd uint64_t freeze_txg = spa_freeze_txg(zilog->zl_spa); 1029168404Spjd list_t clean_list; 1030168404Spjd itx_t *itx; 1031168404Spjd 1032168404Spjd list_create(&clean_list, sizeof (itx_t), offsetof(itx_t, itx_node)); 1033168404Spjd 1034168404Spjd mutex_enter(&zilog->zl_lock); 1035168404Spjd /* wait for a log writer to finish walking list */ 1036168404Spjd while (zilog->zl_writer) { 1037168404Spjd cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock); 1038168404Spjd } 1039168404Spjd 1040168404Spjd /* 1041168404Spjd * Move the sync'd log transactions to a separate list so we can call 1042168404Spjd * kmem_free without holding the zl_lock. 1043168404Spjd * 1044168404Spjd * There is no need to set zl_writer as we don't drop zl_lock here 1045168404Spjd */ 1046168404Spjd while ((itx = list_head(&zilog->zl_itx_list)) != NULL && 1047168404Spjd itx->itx_lr.lrc_txg <= MIN(synced_txg, freeze_txg)) { 1048168404Spjd list_remove(&zilog->zl_itx_list, itx); 1049185029Spjd zilog->zl_itx_list_sz -= itx->itx_sod; 1050168404Spjd list_insert_tail(&clean_list, itx); 1051168404Spjd } 1052168404Spjd cv_broadcast(&zilog->zl_cv_writer); 1053168404Spjd mutex_exit(&zilog->zl_lock); 1054168404Spjd 1055168404Spjd /* destroy sync'd log transactions */ 1056168404Spjd while ((itx = list_head(&clean_list)) != NULL) { 1057168404Spjd list_remove(&clean_list, itx); 1058168404Spjd kmem_free(itx, offsetof(itx_t, itx_lr) 1059168404Spjd + itx->itx_lr.lrc_reclen); 1060168404Spjd } 1061168404Spjd list_destroy(&clean_list); 1062168404Spjd} 1063168404Spjd 1064168404Spjd/* 1065168404Spjd * If there are any in-memory intent log transactions which have now been 1066168404Spjd * synced then start up a taskq to free them. 1067168404Spjd */ 1068168404Spjdvoid 1069168404Spjdzil_clean(zilog_t *zilog) 1070168404Spjd{ 1071168404Spjd itx_t *itx; 1072168404Spjd 1073168404Spjd mutex_enter(&zilog->zl_lock); 1074168404Spjd itx = list_head(&zilog->zl_itx_list); 1075168404Spjd if ((itx != NULL) && 1076168404Spjd (itx->itx_lr.lrc_txg <= spa_last_synced_txg(zilog->zl_spa))) { 1077168404Spjd (void) taskq_dispatch(zilog->zl_clean_taskq, 1078191900Skmacy (task_func_t *)zil_itx_clean, zilog, TQ_SLEEP); 1079168404Spjd } 1080168404Spjd mutex_exit(&zilog->zl_lock); 1081168404Spjd} 1082168404Spjd 1083185029Spjdstatic void 1084168404Spjdzil_commit_writer(zilog_t *zilog, uint64_t seq, uint64_t foid) 1085168404Spjd{ 1086168404Spjd uint64_t txg; 1087168404Spjd uint64_t commit_seq = 0; 1088168404Spjd itx_t *itx, *itx_next = (itx_t *)-1; 1089168404Spjd lwb_t *lwb; 1090168404Spjd spa_t *spa; 1091168404Spjd 1092168404Spjd zilog->zl_writer = B_TRUE; 1093185029Spjd ASSERT(zilog->zl_root_zio == NULL); 1094168404Spjd spa = zilog->zl_spa; 1095168404Spjd 1096168404Spjd if (zilog->zl_suspend) { 1097168404Spjd lwb = NULL; 1098168404Spjd } else { 1099168404Spjd lwb = list_tail(&zilog->zl_lwb_list); 1100168404Spjd if (lwb == NULL) { 1101168404Spjd /* 1102168404Spjd * Return if there's nothing to flush before we 1103168404Spjd * dirty the fs by calling zil_create() 1104168404Spjd */ 1105168404Spjd if (list_is_empty(&zilog->zl_itx_list)) { 1106168404Spjd zilog->zl_writer = B_FALSE; 1107168404Spjd return; 1108168404Spjd } 1109168404Spjd mutex_exit(&zilog->zl_lock); 1110168404Spjd zil_create(zilog); 1111168404Spjd mutex_enter(&zilog->zl_lock); 1112168404Spjd lwb = list_tail(&zilog->zl_lwb_list); 1113168404Spjd } 1114168404Spjd } 1115168404Spjd 1116168404Spjd /* Loop through in-memory log transactions filling log blocks. */ 1117168404Spjd DTRACE_PROBE1(zil__cw1, zilog_t *, zilog); 1118168404Spjd for (;;) { 1119168404Spjd /* 1120168404Spjd * Find the next itx to push: 1121168404Spjd * Push all transactions related to specified foid and all 1122168404Spjd * other transactions except TX_WRITE, TX_TRUNCATE, 1123168404Spjd * TX_SETATTR and TX_ACL for all other files. 1124168404Spjd */ 1125168404Spjd if (itx_next != (itx_t *)-1) 1126168404Spjd itx = itx_next; 1127168404Spjd else 1128168404Spjd itx = list_head(&zilog->zl_itx_list); 1129168404Spjd for (; itx != NULL; itx = list_next(&zilog->zl_itx_list, itx)) { 1130168404Spjd if (foid == 0) /* push all foids? */ 1131168404Spjd break; 1132168404Spjd if (itx->itx_sync) /* push all O_[D]SYNC */ 1133168404Spjd break; 1134168404Spjd switch (itx->itx_lr.lrc_txtype) { 1135168404Spjd case TX_SETATTR: 1136168404Spjd case TX_WRITE: 1137168404Spjd case TX_TRUNCATE: 1138168404Spjd case TX_ACL: 1139168404Spjd /* lr_foid is same offset for these records */ 1140168404Spjd if (((lr_write_t *)&itx->itx_lr)->lr_foid 1141168404Spjd != foid) { 1142168404Spjd continue; /* skip this record */ 1143168404Spjd } 1144168404Spjd } 1145168404Spjd break; 1146168404Spjd } 1147168404Spjd if (itx == NULL) 1148168404Spjd break; 1149168404Spjd 1150168404Spjd if ((itx->itx_lr.lrc_seq > seq) && 1151168404Spjd ((lwb == NULL) || (lwb->lwb_nused == 0) || 1152185029Spjd (lwb->lwb_nused + itx->itx_sod > ZIL_BLK_DATA_SZ(lwb)))) { 1153168404Spjd break; 1154168404Spjd } 1155168404Spjd 1156168404Spjd /* 1157168404Spjd * Save the next pointer. Even though we soon drop 1158168404Spjd * zl_lock all threads that may change the list 1159168404Spjd * (another writer or zil_itx_clean) can't do so until 1160168404Spjd * they have zl_writer. 1161168404Spjd */ 1162168404Spjd itx_next = list_next(&zilog->zl_itx_list, itx); 1163168404Spjd list_remove(&zilog->zl_itx_list, itx); 1164185029Spjd zilog->zl_itx_list_sz -= itx->itx_sod; 1165168404Spjd mutex_exit(&zilog->zl_lock); 1166168404Spjd txg = itx->itx_lr.lrc_txg; 1167168404Spjd ASSERT(txg); 1168168404Spjd 1169168404Spjd if (txg > spa_last_synced_txg(spa) || 1170168404Spjd txg > spa_freeze_txg(spa)) 1171168404Spjd lwb = zil_lwb_commit(zilog, itx, lwb); 1172168404Spjd kmem_free(itx, offsetof(itx_t, itx_lr) 1173168404Spjd + itx->itx_lr.lrc_reclen); 1174168404Spjd mutex_enter(&zilog->zl_lock); 1175168404Spjd } 1176168404Spjd DTRACE_PROBE1(zil__cw2, zilog_t *, zilog); 1177168404Spjd /* determine commit sequence number */ 1178168404Spjd itx = list_head(&zilog->zl_itx_list); 1179168404Spjd if (itx) 1180168404Spjd commit_seq = itx->itx_lr.lrc_seq; 1181168404Spjd else 1182168404Spjd commit_seq = zilog->zl_itx_seq; 1183168404Spjd mutex_exit(&zilog->zl_lock); 1184168404Spjd 1185168404Spjd /* write the last block out */ 1186168404Spjd if (lwb != NULL && lwb->lwb_zio != NULL) 1187168404Spjd lwb = zil_lwb_write_start(zilog, lwb); 1188168404Spjd 1189168404Spjd zilog->zl_prev_used = zilog->zl_cur_used; 1190168404Spjd zilog->zl_cur_used = 0; 1191168404Spjd 1192168404Spjd /* 1193168404Spjd * Wait if necessary for the log blocks to be on stable storage. 1194168404Spjd */ 1195168404Spjd if (zilog->zl_root_zio) { 1196168404Spjd DTRACE_PROBE1(zil__cw3, zilog_t *, zilog); 1197168404Spjd (void) zio_wait(zilog->zl_root_zio); 1198185029Spjd zilog->zl_root_zio = NULL; 1199168404Spjd DTRACE_PROBE1(zil__cw4, zilog_t *, zilog); 1200185029Spjd zil_flush_vdevs(zilog); 1201168404Spjd } 1202168404Spjd 1203168404Spjd if (zilog->zl_log_error || lwb == NULL) { 1204168404Spjd zilog->zl_log_error = 0; 1205168404Spjd txg_wait_synced(zilog->zl_dmu_pool, 0); 1206168404Spjd } 1207168404Spjd 1208168404Spjd mutex_enter(&zilog->zl_lock); 1209168404Spjd zilog->zl_writer = B_FALSE; 1210168404Spjd 1211168404Spjd ASSERT3U(commit_seq, >=, zilog->zl_commit_seq); 1212168404Spjd zilog->zl_commit_seq = commit_seq; 1213168404Spjd} 1214168404Spjd 1215168404Spjd/* 1216168404Spjd * Push zfs transactions to stable storage up to the supplied sequence number. 1217168404Spjd * If foid is 0 push out all transactions, otherwise push only those 1218168404Spjd * for that file or might have been used to create that file. 1219168404Spjd */ 1220168404Spjdvoid 1221168404Spjdzil_commit(zilog_t *zilog, uint64_t seq, uint64_t foid) 1222168404Spjd{ 1223168404Spjd if (zilog == NULL || seq == 0) 1224168404Spjd return; 1225168404Spjd 1226168404Spjd mutex_enter(&zilog->zl_lock); 1227168404Spjd 1228168404Spjd seq = MIN(seq, zilog->zl_itx_seq); /* cap seq at largest itx seq */ 1229168404Spjd 1230168404Spjd while (zilog->zl_writer) { 1231168404Spjd cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock); 1232168404Spjd if (seq < zilog->zl_commit_seq) { 1233168404Spjd mutex_exit(&zilog->zl_lock); 1234168404Spjd return; 1235168404Spjd } 1236168404Spjd } 1237168404Spjd zil_commit_writer(zilog, seq, foid); /* drops zl_lock */ 1238168404Spjd /* wake up others waiting on the commit */ 1239168404Spjd cv_broadcast(&zilog->zl_cv_writer); 1240168404Spjd mutex_exit(&zilog->zl_lock); 1241168404Spjd} 1242168404Spjd 1243168404Spjd/* 1244168404Spjd * Called in syncing context to free committed log blocks and update log header. 1245168404Spjd */ 1246168404Spjdvoid 1247168404Spjdzil_sync(zilog_t *zilog, dmu_tx_t *tx) 1248168404Spjd{ 1249168404Spjd zil_header_t *zh = zil_header_in_syncing_context(zilog); 1250168404Spjd uint64_t txg = dmu_tx_get_txg(tx); 1251168404Spjd spa_t *spa = zilog->zl_spa; 1252168404Spjd lwb_t *lwb; 1253168404Spjd 1254168404Spjd mutex_enter(&zilog->zl_lock); 1255168404Spjd 1256168404Spjd ASSERT(zilog->zl_stop_sync == 0); 1257168404Spjd 1258168404Spjd zh->zh_replay_seq = zilog->zl_replay_seq[txg & TXG_MASK]; 1259168404Spjd 1260168404Spjd if (zilog->zl_destroy_txg == txg) { 1261168404Spjd blkptr_t blk = zh->zh_log; 1262168404Spjd 1263168404Spjd ASSERT(list_head(&zilog->zl_lwb_list) == NULL); 1264168404Spjd ASSERT(spa_sync_pass(spa) == 1); 1265168404Spjd 1266168404Spjd bzero(zh, sizeof (zil_header_t)); 1267168404Spjd bzero(zilog->zl_replay_seq, sizeof (zilog->zl_replay_seq)); 1268168404Spjd 1269168404Spjd if (zilog->zl_keep_first) { 1270168404Spjd /* 1271168404Spjd * If this block was part of log chain that couldn't 1272168404Spjd * be claimed because a device was missing during 1273168404Spjd * zil_claim(), but that device later returns, 1274168404Spjd * then this block could erroneously appear valid. 1275168404Spjd * To guard against this, assign a new GUID to the new 1276168404Spjd * log chain so it doesn't matter what blk points to. 1277168404Spjd */ 1278168404Spjd zil_init_log_chain(zilog, &blk); 1279168404Spjd zh->zh_log = blk; 1280168404Spjd } 1281168404Spjd } 1282168404Spjd 1283168404Spjd for (;;) { 1284168404Spjd lwb = list_head(&zilog->zl_lwb_list); 1285168404Spjd if (lwb == NULL) { 1286168404Spjd mutex_exit(&zilog->zl_lock); 1287168404Spjd return; 1288168404Spjd } 1289168404Spjd zh->zh_log = lwb->lwb_blk; 1290168404Spjd if (lwb->lwb_buf != NULL || lwb->lwb_max_txg > txg) 1291168404Spjd break; 1292168404Spjd list_remove(&zilog->zl_lwb_list, lwb); 1293168404Spjd zio_free_blk(spa, &lwb->lwb_blk, txg); 1294168404Spjd kmem_cache_free(zil_lwb_cache, lwb); 1295168404Spjd 1296168404Spjd /* 1297168404Spjd * If we don't have anything left in the lwb list then 1298168404Spjd * we've had an allocation failure and we need to zero 1299168404Spjd * out the zil_header blkptr so that we don't end 1300168404Spjd * up freeing the same block twice. 1301168404Spjd */ 1302168404Spjd if (list_head(&zilog->zl_lwb_list) == NULL) 1303168404Spjd BP_ZERO(&zh->zh_log); 1304168404Spjd } 1305168404Spjd mutex_exit(&zilog->zl_lock); 1306168404Spjd} 1307168404Spjd 1308168404Spjdvoid 1309168404Spjdzil_init(void) 1310168404Spjd{ 1311168404Spjd zil_lwb_cache = kmem_cache_create("zil_lwb_cache", 1312168404Spjd sizeof (struct lwb), 0, NULL, NULL, NULL, NULL, NULL, 0); 1313168404Spjd} 1314168404Spjd 1315168404Spjdvoid 1316168404Spjdzil_fini(void) 1317168404Spjd{ 1318168404Spjd kmem_cache_destroy(zil_lwb_cache); 1319168404Spjd} 1320168404Spjd 1321168404Spjdzilog_t * 1322168404Spjdzil_alloc(objset_t *os, zil_header_t *zh_phys) 1323168404Spjd{ 1324168404Spjd zilog_t *zilog; 1325168404Spjd 1326168404Spjd zilog = kmem_zalloc(sizeof (zilog_t), KM_SLEEP); 1327168404Spjd 1328168404Spjd zilog->zl_header = zh_phys; 1329168404Spjd zilog->zl_os = os; 1330168404Spjd zilog->zl_spa = dmu_objset_spa(os); 1331168404Spjd zilog->zl_dmu_pool = dmu_objset_pool(os); 1332168404Spjd zilog->zl_destroy_txg = TXG_INITIAL - 1; 1333168404Spjd 1334168404Spjd mutex_init(&zilog->zl_lock, NULL, MUTEX_DEFAULT, NULL); 1335168404Spjd 1336168404Spjd list_create(&zilog->zl_itx_list, sizeof (itx_t), 1337168404Spjd offsetof(itx_t, itx_node)); 1338168404Spjd 1339168404Spjd list_create(&zilog->zl_lwb_list, sizeof (lwb_t), 1340168404Spjd offsetof(lwb_t, lwb_node)); 1341168404Spjd 1342185029Spjd mutex_init(&zilog->zl_vdev_lock, NULL, MUTEX_DEFAULT, NULL); 1343168404Spjd 1344185029Spjd avl_create(&zilog->zl_vdev_tree, zil_vdev_compare, 1345185029Spjd sizeof (zil_vdev_node_t), offsetof(zil_vdev_node_t, zv_node)); 1346185029Spjd 1347185029Spjd cv_init(&zilog->zl_cv_writer, NULL, CV_DEFAULT, NULL); 1348185029Spjd cv_init(&zilog->zl_cv_suspend, NULL, CV_DEFAULT, NULL); 1349185029Spjd 1350168404Spjd return (zilog); 1351168404Spjd} 1352168404Spjd 1353168404Spjdvoid 1354168404Spjdzil_free(zilog_t *zilog) 1355168404Spjd{ 1356168404Spjd lwb_t *lwb; 1357168404Spjd 1358168404Spjd zilog->zl_stop_sync = 1; 1359168404Spjd 1360168404Spjd while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) { 1361168404Spjd list_remove(&zilog->zl_lwb_list, lwb); 1362168404Spjd if (lwb->lwb_buf != NULL) 1363168404Spjd zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); 1364168404Spjd kmem_cache_free(zil_lwb_cache, lwb); 1365168404Spjd } 1366168404Spjd list_destroy(&zilog->zl_lwb_list); 1367168404Spjd 1368185029Spjd avl_destroy(&zilog->zl_vdev_tree); 1369185029Spjd mutex_destroy(&zilog->zl_vdev_lock); 1370168404Spjd 1371168404Spjd ASSERT(list_head(&zilog->zl_itx_list) == NULL); 1372168404Spjd list_destroy(&zilog->zl_itx_list); 1373168404Spjd mutex_destroy(&zilog->zl_lock); 1374168404Spjd 1375185029Spjd cv_destroy(&zilog->zl_cv_writer); 1376185029Spjd cv_destroy(&zilog->zl_cv_suspend); 1377185029Spjd 1378168404Spjd kmem_free(zilog, sizeof (zilog_t)); 1379168404Spjd} 1380168404Spjd 1381168404Spjd/* 1382168404Spjd * Open an intent log. 1383168404Spjd */ 1384168404Spjdzilog_t * 1385168404Spjdzil_open(objset_t *os, zil_get_data_t *get_data) 1386168404Spjd{ 1387168404Spjd zilog_t *zilog = dmu_objset_zil(os); 1388168404Spjd 1389168404Spjd zilog->zl_get_data = get_data; 1390168404Spjd zilog->zl_clean_taskq = taskq_create("zil_clean", 1, minclsyspri, 1391168404Spjd 2, 2, TASKQ_PREPOPULATE); 1392168404Spjd 1393168404Spjd return (zilog); 1394168404Spjd} 1395168404Spjd 1396168404Spjd/* 1397168404Spjd * Close an intent log. 1398168404Spjd */ 1399168404Spjdvoid 1400168404Spjdzil_close(zilog_t *zilog) 1401168404Spjd{ 1402168404Spjd /* 1403168404Spjd * If the log isn't already committed, mark the objset dirty 1404168404Spjd * (so zil_sync() will be called) and wait for that txg to sync. 1405168404Spjd */ 1406168404Spjd if (!zil_is_committed(zilog)) { 1407168404Spjd uint64_t txg; 1408168404Spjd dmu_tx_t *tx = dmu_tx_create(zilog->zl_os); 1409168404Spjd (void) dmu_tx_assign(tx, TXG_WAIT); 1410168404Spjd dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 1411168404Spjd txg = dmu_tx_get_txg(tx); 1412168404Spjd dmu_tx_commit(tx); 1413168404Spjd txg_wait_synced(zilog->zl_dmu_pool, txg); 1414168404Spjd } 1415168404Spjd 1416168404Spjd taskq_destroy(zilog->zl_clean_taskq); 1417168404Spjd zilog->zl_clean_taskq = NULL; 1418168404Spjd zilog->zl_get_data = NULL; 1419168404Spjd 1420168404Spjd zil_itx_clean(zilog); 1421168404Spjd ASSERT(list_head(&zilog->zl_itx_list) == NULL); 1422168404Spjd} 1423168404Spjd 1424168404Spjd/* 1425168404Spjd * Suspend an intent log. While in suspended mode, we still honor 1426168404Spjd * synchronous semantics, but we rely on txg_wait_synced() to do it. 1427168404Spjd * We suspend the log briefly when taking a snapshot so that the snapshot 1428168404Spjd * contains all the data it's supposed to, and has an empty intent log. 1429168404Spjd */ 1430168404Spjdint 1431168404Spjdzil_suspend(zilog_t *zilog) 1432168404Spjd{ 1433168404Spjd const zil_header_t *zh = zilog->zl_header; 1434168404Spjd 1435168404Spjd mutex_enter(&zilog->zl_lock); 1436200724Sdelphij if (zh->zh_flags & ZIL_REPLAY_NEEDED) { /* unplayed log */ 1437168404Spjd mutex_exit(&zilog->zl_lock); 1438168404Spjd return (EBUSY); 1439168404Spjd } 1440168404Spjd if (zilog->zl_suspend++ != 0) { 1441168404Spjd /* 1442168404Spjd * Someone else already began a suspend. 1443168404Spjd * Just wait for them to finish. 1444168404Spjd */ 1445168404Spjd while (zilog->zl_suspending) 1446168404Spjd cv_wait(&zilog->zl_cv_suspend, &zilog->zl_lock); 1447168404Spjd mutex_exit(&zilog->zl_lock); 1448168404Spjd return (0); 1449168404Spjd } 1450168404Spjd zilog->zl_suspending = B_TRUE; 1451168404Spjd mutex_exit(&zilog->zl_lock); 1452168404Spjd 1453168404Spjd zil_commit(zilog, UINT64_MAX, 0); 1454168404Spjd 1455168404Spjd /* 1456168404Spjd * Wait for any in-flight log writes to complete. 1457168404Spjd */ 1458168404Spjd mutex_enter(&zilog->zl_lock); 1459168404Spjd while (zilog->zl_writer) 1460168404Spjd cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock); 1461168404Spjd mutex_exit(&zilog->zl_lock); 1462168404Spjd 1463168404Spjd zil_destroy(zilog, B_FALSE); 1464168404Spjd 1465168404Spjd mutex_enter(&zilog->zl_lock); 1466168404Spjd zilog->zl_suspending = B_FALSE; 1467168404Spjd cv_broadcast(&zilog->zl_cv_suspend); 1468168404Spjd mutex_exit(&zilog->zl_lock); 1469168404Spjd 1470168404Spjd return (0); 1471168404Spjd} 1472168404Spjd 1473168404Spjdvoid 1474168404Spjdzil_resume(zilog_t *zilog) 1475168404Spjd{ 1476168404Spjd mutex_enter(&zilog->zl_lock); 1477168404Spjd ASSERT(zilog->zl_suspend != 0); 1478168404Spjd zilog->zl_suspend--; 1479168404Spjd mutex_exit(&zilog->zl_lock); 1480168404Spjd} 1481168404Spjd 1482168404Spjdtypedef struct zil_replay_arg { 1483168404Spjd objset_t *zr_os; 1484168404Spjd zil_replay_func_t **zr_replay; 1485185029Spjd zil_replay_cleaner_t *zr_replay_cleaner; 1486168404Spjd void *zr_arg; 1487168404Spjd uint64_t *zr_txgp; 1488168404Spjd boolean_t zr_byteswap; 1489168404Spjd char *zr_lrbuf; 1490168404Spjd} zil_replay_arg_t; 1491168404Spjd 1492168404Spjdstatic void 1493168404Spjdzil_replay_log_record(zilog_t *zilog, lr_t *lr, void *zra, uint64_t claim_txg) 1494168404Spjd{ 1495168404Spjd zil_replay_arg_t *zr = zra; 1496168404Spjd const zil_header_t *zh = zilog->zl_header; 1497168404Spjd uint64_t reclen = lr->lrc_reclen; 1498168404Spjd uint64_t txtype = lr->lrc_txtype; 1499168404Spjd char *name; 1500168404Spjd int pass, error, sunk; 1501168404Spjd 1502168404Spjd if (zilog->zl_stop_replay) 1503168404Spjd return; 1504168404Spjd 1505168404Spjd if (lr->lrc_txg < claim_txg) /* already committed */ 1506168404Spjd return; 1507168404Spjd 1508168404Spjd if (lr->lrc_seq <= zh->zh_replay_seq) /* already replayed */ 1509168404Spjd return; 1510168404Spjd 1511185029Spjd /* Strip case-insensitive bit, still present in log record */ 1512185029Spjd txtype &= ~TX_CI; 1513185029Spjd 1514168404Spjd /* 1515168404Spjd * Make a copy of the data so we can revise and extend it. 1516168404Spjd */ 1517168404Spjd bcopy(lr, zr->zr_lrbuf, reclen); 1518168404Spjd 1519168404Spjd /* 1520168404Spjd * The log block containing this lr may have been byteswapped 1521168404Spjd * so that we can easily examine common fields like lrc_txtype. 1522168404Spjd * However, the log is a mix of different data types, and only the 1523168404Spjd * replay vectors know how to byteswap their records. Therefore, if 1524168404Spjd * the lr was byteswapped, undo it before invoking the replay vector. 1525168404Spjd */ 1526168404Spjd if (zr->zr_byteswap) 1527168404Spjd byteswap_uint64_array(zr->zr_lrbuf, reclen); 1528168404Spjd 1529168404Spjd /* 1530168404Spjd * If this is a TX_WRITE with a blkptr, suck in the data. 1531168404Spjd */ 1532168404Spjd if (txtype == TX_WRITE && reclen == sizeof (lr_write_t)) { 1533168404Spjd lr_write_t *lrw = (lr_write_t *)lr; 1534168404Spjd blkptr_t *wbp = &lrw->lr_blkptr; 1535168404Spjd uint64_t wlen = lrw->lr_length; 1536168404Spjd char *wbuf = zr->zr_lrbuf + reclen; 1537168404Spjd 1538168404Spjd if (BP_IS_HOLE(wbp)) { /* compressed to a hole */ 1539168404Spjd bzero(wbuf, wlen); 1540168404Spjd } else { 1541168404Spjd /* 1542168404Spjd * A subsequent write may have overwritten this block, 1543168404Spjd * in which case wbp may have been been freed and 1544168404Spjd * reallocated, and our read of wbp may fail with a 1545168404Spjd * checksum error. We can safely ignore this because 1546168404Spjd * the later write will provide the correct data. 1547168404Spjd */ 1548168404Spjd zbookmark_t zb; 1549168404Spjd 1550168404Spjd zb.zb_objset = dmu_objset_id(zilog->zl_os); 1551168404Spjd zb.zb_object = lrw->lr_foid; 1552168404Spjd zb.zb_level = -1; 1553168404Spjd zb.zb_blkid = lrw->lr_offset / BP_GET_LSIZE(wbp); 1554168404Spjd 1555168404Spjd (void) zio_wait(zio_read(NULL, zilog->zl_spa, 1556168404Spjd wbp, wbuf, BP_GET_LSIZE(wbp), NULL, NULL, 1557168404Spjd ZIO_PRIORITY_SYNC_READ, 1558168404Spjd ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &zb)); 1559168404Spjd (void) memmove(wbuf, wbuf + lrw->lr_blkoff, wlen); 1560168404Spjd } 1561168404Spjd } 1562168404Spjd 1563168404Spjd /* 1564168404Spjd * We must now do two things atomically: replay this log record, 1565168404Spjd * and update the log header to reflect the fact that we did so. 1566168404Spjd * We use the DMU's ability to assign into a specific txg to do this. 1567168404Spjd */ 1568168404Spjd for (pass = 1, sunk = B_FALSE; /* CONSTANTCONDITION */; pass++) { 1569168404Spjd uint64_t replay_txg; 1570168404Spjd dmu_tx_t *replay_tx; 1571168404Spjd 1572168404Spjd replay_tx = dmu_tx_create(zr->zr_os); 1573168404Spjd error = dmu_tx_assign(replay_tx, TXG_WAIT); 1574168404Spjd if (error) { 1575168404Spjd dmu_tx_abort(replay_tx); 1576168404Spjd break; 1577168404Spjd } 1578168404Spjd 1579168404Spjd replay_txg = dmu_tx_get_txg(replay_tx); 1580168404Spjd 1581168404Spjd if (txtype == 0 || txtype >= TX_MAX_TYPE) { 1582168404Spjd error = EINVAL; 1583168404Spjd } else { 1584168404Spjd /* 1585168404Spjd * On the first pass, arrange for the replay vector 1586168404Spjd * to fail its dmu_tx_assign(). That's the only way 1587168404Spjd * to ensure that those code paths remain well tested. 1588185029Spjd * 1589185029Spjd * Only byteswap (if needed) on the 1st pass. 1590168404Spjd */ 1591168404Spjd *zr->zr_txgp = replay_txg - (pass == 1); 1592168404Spjd error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lrbuf, 1593185029Spjd zr->zr_byteswap && pass == 1); 1594168404Spjd *zr->zr_txgp = TXG_NOWAIT; 1595168404Spjd } 1596168404Spjd 1597168404Spjd if (error == 0) { 1598168404Spjd dsl_dataset_dirty(dmu_objset_ds(zr->zr_os), replay_tx); 1599168404Spjd zilog->zl_replay_seq[replay_txg & TXG_MASK] = 1600168404Spjd lr->lrc_seq; 1601168404Spjd } 1602168404Spjd 1603168404Spjd dmu_tx_commit(replay_tx); 1604168404Spjd 1605168404Spjd if (!error) 1606168404Spjd return; 1607168404Spjd 1608168404Spjd /* 1609168404Spjd * The DMU's dnode layer doesn't see removes until the txg 1610168404Spjd * commits, so a subsequent claim can spuriously fail with 1611168404Spjd * EEXIST. So if we receive any error other than ERESTART 1612168404Spjd * we try syncing out any removes then retrying the 1613168404Spjd * transaction. 1614168404Spjd */ 1615168404Spjd if (error != ERESTART && !sunk) { 1616185029Spjd if (zr->zr_replay_cleaner) 1617185029Spjd zr->zr_replay_cleaner(zr->zr_arg); 1618168404Spjd txg_wait_synced(spa_get_dsl(zilog->zl_spa), 0); 1619168404Spjd sunk = B_TRUE; 1620168404Spjd continue; /* retry */ 1621168404Spjd } 1622168404Spjd 1623168404Spjd if (error != ERESTART) 1624168404Spjd break; 1625168404Spjd 1626168404Spjd if (pass != 1) 1627168404Spjd txg_wait_open(spa_get_dsl(zilog->zl_spa), 1628168404Spjd replay_txg + 1); 1629168404Spjd 1630168404Spjd dprintf("pass %d, retrying\n", pass); 1631168404Spjd } 1632168404Spjd 1633168404Spjd ASSERT(error && error != ERESTART); 1634168404Spjd name = kmem_alloc(MAXNAMELEN, KM_SLEEP); 1635168404Spjd dmu_objset_name(zr->zr_os, name); 1636168404Spjd cmn_err(CE_WARN, "ZFS replay transaction error %d, " 1637185029Spjd "dataset %s, seq 0x%llx, txtype %llu %s\n", 1638185029Spjd error, name, (u_longlong_t)lr->lrc_seq, (u_longlong_t)txtype, 1639185029Spjd (lr->lrc_txtype & TX_CI) ? "CI" : ""); 1640168404Spjd zilog->zl_stop_replay = 1; 1641168404Spjd kmem_free(name, MAXNAMELEN); 1642168404Spjd} 1643168404Spjd 1644168404Spjd/* ARGSUSED */ 1645168404Spjdstatic void 1646168404Spjdzil_incr_blks(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) 1647168404Spjd{ 1648168404Spjd zilog->zl_replay_blks++; 1649168404Spjd} 1650168404Spjd 1651168404Spjd/* 1652168404Spjd * If this dataset has a non-empty intent log, replay it and destroy it. 1653168404Spjd */ 1654168404Spjdvoid 1655168404Spjdzil_replay(objset_t *os, void *arg, uint64_t *txgp, 1656185029Spjd zil_replay_func_t *replay_func[TX_MAX_TYPE], 1657185029Spjd zil_replay_cleaner_t *replay_cleaner) 1658168404Spjd{ 1659168404Spjd zilog_t *zilog = dmu_objset_zil(os); 1660168404Spjd const zil_header_t *zh = zilog->zl_header; 1661168404Spjd zil_replay_arg_t zr; 1662168404Spjd 1663200724Sdelphij if ((zh->zh_flags & ZIL_REPLAY_NEEDED) == 0) { 1664168404Spjd zil_destroy(zilog, B_TRUE); 1665168404Spjd return; 1666168404Spjd } 1667168404Spjd //printf("ZFS: Replaying ZIL on %s...\n", os->os->os_spa->spa_name); 1668168404Spjd 1669168404Spjd zr.zr_os = os; 1670168404Spjd zr.zr_replay = replay_func; 1671185029Spjd zr.zr_replay_cleaner = replay_cleaner; 1672168404Spjd zr.zr_arg = arg; 1673168404Spjd zr.zr_txgp = txgp; 1674168404Spjd zr.zr_byteswap = BP_SHOULD_BYTESWAP(&zh->zh_log); 1675168404Spjd zr.zr_lrbuf = kmem_alloc(2 * SPA_MAXBLOCKSIZE, KM_SLEEP); 1676168404Spjd 1677168404Spjd /* 1678168404Spjd * Wait for in-progress removes to sync before starting replay. 1679168404Spjd */ 1680168404Spjd txg_wait_synced(zilog->zl_dmu_pool, 0); 1681168404Spjd 1682168404Spjd zilog->zl_stop_replay = 0; 1683174049Sjb zilog->zl_replay_time = LBOLT; 1684168404Spjd ASSERT(zilog->zl_replay_blks == 0); 1685168404Spjd (void) zil_parse(zilog, zil_incr_blks, zil_replay_log_record, &zr, 1686168404Spjd zh->zh_claim_txg); 1687168404Spjd kmem_free(zr.zr_lrbuf, 2 * SPA_MAXBLOCKSIZE); 1688168404Spjd 1689168404Spjd zil_destroy(zilog, B_FALSE); 1690185029Spjd txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); 1691168404Spjd //printf("ZFS: Replay of ZIL on %s finished.\n", os->os->os_spa->spa_name); 1692168404Spjd} 1693168404Spjd 1694168404Spjd/* 1695168404Spjd * Report whether all transactions are committed 1696168404Spjd */ 1697168404Spjdint 1698168404Spjdzil_is_committed(zilog_t *zilog) 1699168404Spjd{ 1700168404Spjd lwb_t *lwb; 1701168404Spjd int ret; 1702168404Spjd 1703168404Spjd mutex_enter(&zilog->zl_lock); 1704168404Spjd while (zilog->zl_writer) 1705168404Spjd cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock); 1706168404Spjd 1707168404Spjd /* recent unpushed intent log transactions? */ 1708168404Spjd if (!list_is_empty(&zilog->zl_itx_list)) { 1709168404Spjd ret = B_FALSE; 1710168404Spjd goto out; 1711168404Spjd } 1712168404Spjd 1713168404Spjd /* intent log never used? */ 1714168404Spjd lwb = list_head(&zilog->zl_lwb_list); 1715168404Spjd if (lwb == NULL) { 1716168404Spjd ret = B_TRUE; 1717168404Spjd goto out; 1718168404Spjd } 1719168404Spjd 1720168404Spjd /* 1721168404Spjd * more than 1 log buffer means zil_sync() hasn't yet freed 1722168404Spjd * entries after a txg has committed 1723168404Spjd */ 1724168404Spjd if (list_next(&zilog->zl_lwb_list, lwb)) { 1725168404Spjd ret = B_FALSE; 1726168404Spjd goto out; 1727168404Spjd } 1728168404Spjd 1729168404Spjd ASSERT(zil_empty(zilog)); 1730168404Spjd ret = B_TRUE; 1731168404Spjdout: 1732168404Spjd cv_broadcast(&zilog->zl_cv_writer); 1733168404Spjd mutex_exit(&zilog->zl_lock); 1734168404Spjd return (ret); 1735168404Spjd} 1736