zil.c revision 168404
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/* 22168404Spjd * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23168404Spjd * Use is subject to license terms. 24168404Spjd */ 25168404Spjd 26168404Spjd#pragma ident "%Z%%M% %I% %E% SMI" 27168404Spjd 28168404Spjd#include <sys/zfs_context.h> 29168404Spjd#include <sys/spa.h> 30168404Spjd#include <sys/dmu.h> 31168404Spjd#include <sys/zap.h> 32168404Spjd#include <sys/arc.h> 33168404Spjd#include <sys/stat.h> 34168404Spjd#include <sys/resource.h> 35168404Spjd#include <sys/zil.h> 36168404Spjd#include <sys/zil_impl.h> 37168404Spjd#include <sys/dsl_dataset.h> 38168404Spjd#include <sys/vdev.h> 39168404Spjd#include <sys/dmu_tx.h> 40168404Spjd 41168404Spjd/* 42168404Spjd * The zfs intent log (ZIL) saves transaction records of system calls 43168404Spjd * that change the file system in memory with enough information 44168404Spjd * to be able to replay them. These are stored in memory until 45168404Spjd * either the DMU transaction group (txg) commits them to the stable pool 46168404Spjd * and they can be discarded, or they are flushed to the stable log 47168404Spjd * (also in the pool) due to a fsync, O_DSYNC or other synchronous 48168404Spjd * requirement. In the event of a panic or power fail then those log 49168404Spjd * records (transactions) are replayed. 50168404Spjd * 51168404Spjd * There is one ZIL per file system. Its on-disk (pool) format consists 52168404Spjd * of 3 parts: 53168404Spjd * 54168404Spjd * - ZIL header 55168404Spjd * - ZIL blocks 56168404Spjd * - ZIL records 57168404Spjd * 58168404Spjd * A log record holds a system call transaction. Log blocks can 59168404Spjd * hold many log records and the blocks are chained together. 60168404Spjd * Each ZIL block contains a block pointer (blkptr_t) to the next 61168404Spjd * ZIL block in the chain. The ZIL header points to the first 62168404Spjd * block in the chain. Note there is not a fixed place in the pool 63168404Spjd * to hold blocks. They are dynamically allocated and freed as 64168404Spjd * needed from the blocks available. Figure X shows the ZIL structure: 65168404Spjd */ 66168404Spjd 67168404Spjd/* 68168404Spjd * This global ZIL switch affects all pools 69168404Spjd */ 70168404Spjdint zil_disable = 0; /* disable intent logging */ 71168404SpjdSYSCTL_DECL(_vfs_zfs); 72168404SpjdTUNABLE_INT("vfs.zfs.zil_disable", &zil_disable); 73168404SpjdSYSCTL_INT(_vfs_zfs, OID_AUTO, zil_disable, CTLFLAG_RDTUN, &zil_disable, 0, 74168404Spjd "Disable ZFS Intent Log (ZIL)"); 75168404Spjd 76168404Spjd/* 77168404Spjd * Tunable parameter for debugging or performance analysis. Setting 78168404Spjd * zfs_nocacheflush will cause corruption on power loss if a volatile 79168404Spjd * out-of-order write cache is enabled. 80168404Spjd */ 81168404Spjdboolean_t zfs_nocacheflush = B_FALSE; 82168404SpjdTUNABLE_INT("vfs.zfs.cache_flush_disable", &zfs_nocacheflush); 83168404SpjdSYSCTL_INT(_vfs_zfs, OID_AUTO, cache_flush_disable, CTLFLAG_RDTUN, 84168404Spjd &zfs_nocacheflush, 0, "Disable cache flush"); 85168404Spjd 86168404Spjdstatic kmem_cache_t *zil_lwb_cache; 87168404Spjd 88168404Spjdstatic int 89168404Spjdzil_dva_compare(const void *x1, const void *x2) 90168404Spjd{ 91168404Spjd const dva_t *dva1 = x1; 92168404Spjd const dva_t *dva2 = x2; 93168404Spjd 94168404Spjd if (DVA_GET_VDEV(dva1) < DVA_GET_VDEV(dva2)) 95168404Spjd return (-1); 96168404Spjd if (DVA_GET_VDEV(dva1) > DVA_GET_VDEV(dva2)) 97168404Spjd return (1); 98168404Spjd 99168404Spjd if (DVA_GET_OFFSET(dva1) < DVA_GET_OFFSET(dva2)) 100168404Spjd return (-1); 101168404Spjd if (DVA_GET_OFFSET(dva1) > DVA_GET_OFFSET(dva2)) 102168404Spjd return (1); 103168404Spjd 104168404Spjd return (0); 105168404Spjd} 106168404Spjd 107168404Spjdstatic void 108168404Spjdzil_dva_tree_init(avl_tree_t *t) 109168404Spjd{ 110168404Spjd avl_create(t, zil_dva_compare, sizeof (zil_dva_node_t), 111168404Spjd offsetof(zil_dva_node_t, zn_node)); 112168404Spjd} 113168404Spjd 114168404Spjdstatic void 115168404Spjdzil_dva_tree_fini(avl_tree_t *t) 116168404Spjd{ 117168404Spjd zil_dva_node_t *zn; 118168404Spjd void *cookie = NULL; 119168404Spjd 120168404Spjd while ((zn = avl_destroy_nodes(t, &cookie)) != NULL) 121168404Spjd kmem_free(zn, sizeof (zil_dva_node_t)); 122168404Spjd 123168404Spjd avl_destroy(t); 124168404Spjd} 125168404Spjd 126168404Spjdstatic int 127168404Spjdzil_dva_tree_add(avl_tree_t *t, dva_t *dva) 128168404Spjd{ 129168404Spjd zil_dva_node_t *zn; 130168404Spjd avl_index_t where; 131168404Spjd 132168404Spjd if (avl_find(t, dva, &where) != NULL) 133168404Spjd return (EEXIST); 134168404Spjd 135168404Spjd zn = kmem_alloc(sizeof (zil_dva_node_t), KM_SLEEP); 136168404Spjd zn->zn_dva = *dva; 137168404Spjd avl_insert(t, zn, where); 138168404Spjd 139168404Spjd return (0); 140168404Spjd} 141168404Spjd 142168404Spjdstatic zil_header_t * 143168404Spjdzil_header_in_syncing_context(zilog_t *zilog) 144168404Spjd{ 145168404Spjd return ((zil_header_t *)zilog->zl_header); 146168404Spjd} 147168404Spjd 148168404Spjdstatic void 149168404Spjdzil_init_log_chain(zilog_t *zilog, blkptr_t *bp) 150168404Spjd{ 151168404Spjd zio_cksum_t *zc = &bp->blk_cksum; 152168404Spjd 153168404Spjd zc->zc_word[ZIL_ZC_GUID_0] = spa_get_random(-1ULL); 154168404Spjd zc->zc_word[ZIL_ZC_GUID_1] = spa_get_random(-1ULL); 155168404Spjd zc->zc_word[ZIL_ZC_OBJSET] = dmu_objset_id(zilog->zl_os); 156168404Spjd zc->zc_word[ZIL_ZC_SEQ] = 1ULL; 157168404Spjd} 158168404Spjd 159168404Spjd/* 160168404Spjd * Read a log block, make sure it's valid, and byteswap it if necessary. 161168404Spjd */ 162168404Spjdstatic int 163168404Spjdzil_read_log_block(zilog_t *zilog, const blkptr_t *bp, arc_buf_t **abufpp) 164168404Spjd{ 165168404Spjd blkptr_t blk = *bp; 166168404Spjd zbookmark_t zb; 167168404Spjd uint32_t aflags = ARC_WAIT; 168168404Spjd int error; 169168404Spjd 170168404Spjd zb.zb_objset = bp->blk_cksum.zc_word[ZIL_ZC_OBJSET]; 171168404Spjd zb.zb_object = 0; 172168404Spjd zb.zb_level = -1; 173168404Spjd zb.zb_blkid = bp->blk_cksum.zc_word[ZIL_ZC_SEQ]; 174168404Spjd 175168404Spjd *abufpp = NULL; 176168404Spjd 177168404Spjd error = arc_read(NULL, zilog->zl_spa, &blk, byteswap_uint64_array, 178168404Spjd arc_getbuf_func, abufpp, ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL | 179168404Spjd ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB, &aflags, &zb); 180168404Spjd 181168404Spjd if (error == 0) { 182168404Spjd char *data = (*abufpp)->b_data; 183168404Spjd uint64_t blksz = BP_GET_LSIZE(bp); 184168404Spjd zil_trailer_t *ztp = (zil_trailer_t *)(data + blksz) - 1; 185168404Spjd zio_cksum_t cksum = bp->blk_cksum; 186168404Spjd 187168404Spjd /* 188168404Spjd * Sequence numbers should be... sequential. The checksum 189168404Spjd * verifier for the next block should be bp's checksum plus 1. 190168404Spjd */ 191168404Spjd cksum.zc_word[ZIL_ZC_SEQ]++; 192168404Spjd 193168404Spjd if (bcmp(&cksum, &ztp->zit_next_blk.blk_cksum, sizeof (cksum))) 194168404Spjd error = ESTALE; 195168404Spjd else if (BP_IS_HOLE(&ztp->zit_next_blk)) 196168404Spjd error = ENOENT; 197168404Spjd else if (ztp->zit_nused > (blksz - sizeof (zil_trailer_t))) 198168404Spjd error = EOVERFLOW; 199168404Spjd 200168404Spjd if (error) { 201168404Spjd VERIFY(arc_buf_remove_ref(*abufpp, abufpp) == 1); 202168404Spjd *abufpp = NULL; 203168404Spjd } 204168404Spjd } 205168404Spjd 206168404Spjd dprintf("error %d on %llu:%llu\n", error, zb.zb_objset, zb.zb_blkid); 207168404Spjd 208168404Spjd return (error); 209168404Spjd} 210168404Spjd 211168404Spjd/* 212168404Spjd * Parse the intent log, and call parse_func for each valid record within. 213168404Spjd * Return the highest sequence number. 214168404Spjd */ 215168404Spjduint64_t 216168404Spjdzil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func, 217168404Spjd zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg) 218168404Spjd{ 219168404Spjd const zil_header_t *zh = zilog->zl_header; 220168404Spjd uint64_t claim_seq = zh->zh_claim_seq; 221168404Spjd uint64_t seq = 0; 222168404Spjd uint64_t max_seq = 0; 223168404Spjd blkptr_t blk = zh->zh_log; 224168404Spjd arc_buf_t *abuf; 225168404Spjd char *lrbuf, *lrp; 226168404Spjd zil_trailer_t *ztp; 227168404Spjd int reclen, error; 228168404Spjd 229168404Spjd if (BP_IS_HOLE(&blk)) 230168404Spjd return (max_seq); 231168404Spjd 232168404Spjd /* 233168404Spjd * Starting at the block pointed to by zh_log we read the log chain. 234168404Spjd * For each block in the chain we strongly check that block to 235168404Spjd * ensure its validity. We stop when an invalid block is found. 236168404Spjd * For each block pointer in the chain we call parse_blk_func(). 237168404Spjd * For each record in each valid block we call parse_lr_func(). 238168404Spjd * If the log has been claimed, stop if we encounter a sequence 239168404Spjd * number greater than the highest claimed sequence number. 240168404Spjd */ 241168404Spjd zil_dva_tree_init(&zilog->zl_dva_tree); 242168404Spjd for (;;) { 243168404Spjd seq = blk.blk_cksum.zc_word[ZIL_ZC_SEQ]; 244168404Spjd 245168404Spjd if (claim_seq != 0 && seq > claim_seq) 246168404Spjd break; 247168404Spjd 248168404Spjd ASSERT(max_seq < seq); 249168404Spjd max_seq = seq; 250168404Spjd 251168404Spjd error = zil_read_log_block(zilog, &blk, &abuf); 252168404Spjd 253168404Spjd if (parse_blk_func != NULL) 254168404Spjd parse_blk_func(zilog, &blk, arg, txg); 255168404Spjd 256168404Spjd if (error) 257168404Spjd break; 258168404Spjd 259168404Spjd lrbuf = abuf->b_data; 260168404Spjd ztp = (zil_trailer_t *)(lrbuf + BP_GET_LSIZE(&blk)) - 1; 261168404Spjd blk = ztp->zit_next_blk; 262168404Spjd 263168404Spjd if (parse_lr_func == NULL) { 264168404Spjd VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 265168404Spjd continue; 266168404Spjd } 267168404Spjd 268168404Spjd for (lrp = lrbuf; lrp < lrbuf + ztp->zit_nused; lrp += reclen) { 269168404Spjd lr_t *lr = (lr_t *)lrp; 270168404Spjd reclen = lr->lrc_reclen; 271168404Spjd ASSERT3U(reclen, >=, sizeof (lr_t)); 272168404Spjd parse_lr_func(zilog, lr, arg, txg); 273168404Spjd } 274168404Spjd VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 275168404Spjd } 276168404Spjd zil_dva_tree_fini(&zilog->zl_dva_tree); 277168404Spjd 278168404Spjd return (max_seq); 279168404Spjd} 280168404Spjd 281168404Spjd/* ARGSUSED */ 282168404Spjdstatic void 283168404Spjdzil_claim_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t first_txg) 284168404Spjd{ 285168404Spjd spa_t *spa = zilog->zl_spa; 286168404Spjd int err; 287168404Spjd 288168404Spjd /* 289168404Spjd * Claim log block if not already committed and not already claimed. 290168404Spjd */ 291168404Spjd if (bp->blk_birth >= first_txg && 292168404Spjd zil_dva_tree_add(&zilog->zl_dva_tree, BP_IDENTITY(bp)) == 0) { 293168404Spjd err = zio_wait(zio_claim(NULL, spa, first_txg, bp, NULL, NULL)); 294168404Spjd ASSERT(err == 0); 295168404Spjd } 296168404Spjd} 297168404Spjd 298168404Spjdstatic void 299168404Spjdzil_claim_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t first_txg) 300168404Spjd{ 301168404Spjd if (lrc->lrc_txtype == TX_WRITE) { 302168404Spjd lr_write_t *lr = (lr_write_t *)lrc; 303168404Spjd zil_claim_log_block(zilog, &lr->lr_blkptr, tx, first_txg); 304168404Spjd } 305168404Spjd} 306168404Spjd 307168404Spjd/* ARGSUSED */ 308168404Spjdstatic void 309168404Spjdzil_free_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t claim_txg) 310168404Spjd{ 311168404Spjd zio_free_blk(zilog->zl_spa, bp, dmu_tx_get_txg(tx)); 312168404Spjd} 313168404Spjd 314168404Spjdstatic void 315168404Spjdzil_free_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t claim_txg) 316168404Spjd{ 317168404Spjd /* 318168404Spjd * If we previously claimed it, we need to free it. 319168404Spjd */ 320168404Spjd if (claim_txg != 0 && lrc->lrc_txtype == TX_WRITE) { 321168404Spjd lr_write_t *lr = (lr_write_t *)lrc; 322168404Spjd blkptr_t *bp = &lr->lr_blkptr; 323168404Spjd if (bp->blk_birth >= claim_txg && 324168404Spjd !zil_dva_tree_add(&zilog->zl_dva_tree, BP_IDENTITY(bp))) { 325168404Spjd (void) arc_free(NULL, zilog->zl_spa, 326168404Spjd dmu_tx_get_txg(tx), bp, NULL, NULL, ARC_WAIT); 327168404Spjd } 328168404Spjd } 329168404Spjd} 330168404Spjd 331168404Spjd/* 332168404Spjd * Create an on-disk intent log. 333168404Spjd */ 334168404Spjdstatic void 335168404Spjdzil_create(zilog_t *zilog) 336168404Spjd{ 337168404Spjd const zil_header_t *zh = zilog->zl_header; 338168404Spjd lwb_t *lwb; 339168404Spjd uint64_t txg = 0; 340168404Spjd dmu_tx_t *tx = NULL; 341168404Spjd blkptr_t blk; 342168404Spjd int error = 0; 343168404Spjd 344168404Spjd /* 345168404Spjd * Wait for any previous destroy to complete. 346168404Spjd */ 347168404Spjd txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); 348168404Spjd 349168404Spjd ASSERT(zh->zh_claim_txg == 0); 350168404Spjd ASSERT(zh->zh_replay_seq == 0); 351168404Spjd 352168404Spjd blk = zh->zh_log; 353168404Spjd 354168404Spjd /* 355168404Spjd * If we don't already have an initial log block, allocate one now. 356168404Spjd */ 357168404Spjd if (BP_IS_HOLE(&blk)) { 358168404Spjd tx = dmu_tx_create(zilog->zl_os); 359168404Spjd (void) dmu_tx_assign(tx, TXG_WAIT); 360168404Spjd dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 361168404Spjd txg = dmu_tx_get_txg(tx); 362168404Spjd 363168404Spjd error = zio_alloc_blk(zilog->zl_spa, ZIL_MIN_BLKSZ, &blk, 364168404Spjd NULL, txg); 365168404Spjd 366168404Spjd if (error == 0) 367168404Spjd zil_init_log_chain(zilog, &blk); 368168404Spjd } 369168404Spjd 370168404Spjd /* 371168404Spjd * Allocate a log write buffer (lwb) for the first log block. 372168404Spjd */ 373168404Spjd if (error == 0) { 374168404Spjd lwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP); 375168404Spjd lwb->lwb_zilog = zilog; 376168404Spjd lwb->lwb_blk = blk; 377168404Spjd lwb->lwb_nused = 0; 378168404Spjd lwb->lwb_sz = BP_GET_LSIZE(&lwb->lwb_blk); 379168404Spjd lwb->lwb_buf = zio_buf_alloc(lwb->lwb_sz); 380168404Spjd lwb->lwb_max_txg = txg; 381168404Spjd lwb->lwb_zio = NULL; 382168404Spjd 383168404Spjd mutex_enter(&zilog->zl_lock); 384168404Spjd list_insert_tail(&zilog->zl_lwb_list, lwb); 385168404Spjd mutex_exit(&zilog->zl_lock); 386168404Spjd } 387168404Spjd 388168404Spjd /* 389168404Spjd * If we just allocated the first log block, commit our transaction 390168404Spjd * and wait for zil_sync() to stuff the block poiner into zh_log. 391168404Spjd * (zh is part of the MOS, so we cannot modify it in open context.) 392168404Spjd */ 393168404Spjd if (tx != NULL) { 394168404Spjd dmu_tx_commit(tx); 395168404Spjd txg_wait_synced(zilog->zl_dmu_pool, txg); 396168404Spjd } 397168404Spjd 398168404Spjd ASSERT(bcmp(&blk, &zh->zh_log, sizeof (blk)) == 0); 399168404Spjd} 400168404Spjd 401168404Spjd/* 402168404Spjd * In one tx, free all log blocks and clear the log header. 403168404Spjd * If keep_first is set, then we're replaying a log with no content. 404168404Spjd * We want to keep the first block, however, so that the first 405168404Spjd * synchronous transaction doesn't require a txg_wait_synced() 406168404Spjd * in zil_create(). We don't need to txg_wait_synced() here either 407168404Spjd * when keep_first is set, because both zil_create() and zil_destroy() 408168404Spjd * will wait for any in-progress destroys to complete. 409168404Spjd */ 410168404Spjdvoid 411168404Spjdzil_destroy(zilog_t *zilog, boolean_t keep_first) 412168404Spjd{ 413168404Spjd const zil_header_t *zh = zilog->zl_header; 414168404Spjd lwb_t *lwb; 415168404Spjd dmu_tx_t *tx; 416168404Spjd uint64_t txg; 417168404Spjd 418168404Spjd /* 419168404Spjd * Wait for any previous destroy to complete. 420168404Spjd */ 421168404Spjd txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); 422168404Spjd 423168404Spjd if (BP_IS_HOLE(&zh->zh_log)) 424168404Spjd return; 425168404Spjd 426168404Spjd tx = dmu_tx_create(zilog->zl_os); 427168404Spjd (void) dmu_tx_assign(tx, TXG_WAIT); 428168404Spjd dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 429168404Spjd txg = dmu_tx_get_txg(tx); 430168404Spjd 431168404Spjd mutex_enter(&zilog->zl_lock); 432168404Spjd 433168404Spjd ASSERT3U(zilog->zl_destroy_txg, <, txg); 434168404Spjd zilog->zl_destroy_txg = txg; 435168404Spjd zilog->zl_keep_first = keep_first; 436168404Spjd 437168404Spjd if (!list_is_empty(&zilog->zl_lwb_list)) { 438168404Spjd ASSERT(zh->zh_claim_txg == 0); 439168404Spjd ASSERT(!keep_first); 440168404Spjd while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) { 441168404Spjd list_remove(&zilog->zl_lwb_list, lwb); 442168404Spjd if (lwb->lwb_buf != NULL) 443168404Spjd zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); 444168404Spjd zio_free_blk(zilog->zl_spa, &lwb->lwb_blk, txg); 445168404Spjd kmem_cache_free(zil_lwb_cache, lwb); 446168404Spjd } 447168404Spjd } else { 448168404Spjd if (!keep_first) { 449168404Spjd (void) zil_parse(zilog, zil_free_log_block, 450168404Spjd zil_free_log_record, tx, zh->zh_claim_txg); 451168404Spjd } 452168404Spjd } 453168404Spjd mutex_exit(&zilog->zl_lock); 454168404Spjd 455168404Spjd dmu_tx_commit(tx); 456168404Spjd 457168404Spjd if (keep_first) /* no need to wait in this case */ 458168404Spjd return; 459168404Spjd 460168404Spjd txg_wait_synced(zilog->zl_dmu_pool, txg); 461168404Spjd ASSERT(BP_IS_HOLE(&zh->zh_log)); 462168404Spjd} 463168404Spjd 464168404Spjdint 465168404Spjdzil_claim(char *osname, void *txarg) 466168404Spjd{ 467168404Spjd dmu_tx_t *tx = txarg; 468168404Spjd uint64_t first_txg = dmu_tx_get_txg(tx); 469168404Spjd zilog_t *zilog; 470168404Spjd zil_header_t *zh; 471168404Spjd objset_t *os; 472168404Spjd int error; 473168404Spjd 474168404Spjd error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_STANDARD, &os); 475168404Spjd if (error) { 476168404Spjd cmn_err(CE_WARN, "can't process intent log for %s", osname); 477168404Spjd return (0); 478168404Spjd } 479168404Spjd 480168404Spjd zilog = dmu_objset_zil(os); 481168404Spjd zh = zil_header_in_syncing_context(zilog); 482168404Spjd 483168404Spjd /* 484168404Spjd * Claim all log blocks if we haven't already done so, and remember 485168404Spjd * the highest claimed sequence number. This ensures that if we can 486168404Spjd * read only part of the log now (e.g. due to a missing device), 487168404Spjd * but we can read the entire log later, we will not try to replay 488168404Spjd * or destroy beyond the last block we successfully claimed. 489168404Spjd */ 490168404Spjd ASSERT3U(zh->zh_claim_txg, <=, first_txg); 491168404Spjd if (zh->zh_claim_txg == 0 && !BP_IS_HOLE(&zh->zh_log)) { 492168404Spjd zh->zh_claim_txg = first_txg; 493168404Spjd zh->zh_claim_seq = zil_parse(zilog, zil_claim_log_block, 494168404Spjd zil_claim_log_record, tx, first_txg); 495168404Spjd dsl_dataset_dirty(dmu_objset_ds(os), tx); 496168404Spjd } 497168404Spjd 498168404Spjd ASSERT3U(first_txg, ==, (spa_last_synced_txg(zilog->zl_spa) + 1)); 499168404Spjd dmu_objset_close(os); 500168404Spjd return (0); 501168404Spjd} 502168404Spjd 503168404Spjdvoid 504168404Spjdzil_add_vdev(zilog_t *zilog, uint64_t vdev) 505168404Spjd{ 506168404Spjd zil_vdev_t *zv, *new; 507168404Spjd uint64_t bmap_sz = sizeof (zilog->zl_vdev_bmap) << 3; 508168404Spjd uchar_t *cp; 509168404Spjd 510168404Spjd if (zfs_nocacheflush) 511168404Spjd return; 512168404Spjd 513168404Spjd if (vdev < bmap_sz) { 514168404Spjd cp = zilog->zl_vdev_bmap + (vdev / 8); 515168404Spjd atomic_or_8(cp, 1 << (vdev % 8)); 516168404Spjd } else { 517168404Spjd /* 518168404Spjd * insert into ordered list 519168404Spjd */ 520168404Spjd mutex_enter(&zilog->zl_lock); 521168404Spjd for (zv = list_head(&zilog->zl_vdev_list); zv != NULL; 522168404Spjd zv = list_next(&zilog->zl_vdev_list, zv)) { 523168404Spjd if (zv->vdev == vdev) { 524168404Spjd /* duplicate found - just return */ 525168404Spjd mutex_exit(&zilog->zl_lock); 526168404Spjd return; 527168404Spjd } 528168404Spjd if (zv->vdev > vdev) { 529168404Spjd /* insert before this entry */ 530168404Spjd new = kmem_alloc(sizeof (zil_vdev_t), 531168404Spjd KM_SLEEP); 532168404Spjd new->vdev = vdev; 533168404Spjd list_insert_before(&zilog->zl_vdev_list, 534168404Spjd zv, new); 535168404Spjd mutex_exit(&zilog->zl_lock); 536168404Spjd return; 537168404Spjd } 538168404Spjd } 539168404Spjd /* ran off end of list, insert at the end */ 540168404Spjd ASSERT(zv == NULL); 541168404Spjd new = kmem_alloc(sizeof (zil_vdev_t), KM_SLEEP); 542168404Spjd new->vdev = vdev; 543168404Spjd list_insert_tail(&zilog->zl_vdev_list, new); 544168404Spjd mutex_exit(&zilog->zl_lock); 545168404Spjd } 546168404Spjd} 547168404Spjd 548168404Spjd/* start an async flush of the write cache for this vdev */ 549168404Spjdvoid 550168404Spjdzil_flush_vdev(spa_t *spa, uint64_t vdev, zio_t **zio) 551168404Spjd{ 552168404Spjd vdev_t *vd; 553168404Spjd 554168404Spjd if (*zio == NULL) 555168404Spjd *zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 556168404Spjd 557168404Spjd vd = vdev_lookup_top(spa, vdev); 558168404Spjd ASSERT(vd); 559168404Spjd 560168404Spjd (void) zio_nowait(zio_ioctl(*zio, spa, vd, DKIOCFLUSHWRITECACHE, 561168404Spjd NULL, NULL, ZIO_PRIORITY_NOW, 562168404Spjd ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_RETRY)); 563168404Spjd} 564168404Spjd 565168404Spjdvoid 566168404Spjdzil_flush_vdevs(zilog_t *zilog) 567168404Spjd{ 568168404Spjd zil_vdev_t *zv; 569168404Spjd zio_t *zio = NULL; 570168404Spjd spa_t *spa = zilog->zl_spa; 571168404Spjd uint64_t vdev; 572168404Spjd uint8_t b; 573168404Spjd int i, j; 574168404Spjd 575168404Spjd ASSERT(zilog->zl_writer); 576168404Spjd 577168404Spjd for (i = 0; i < sizeof (zilog->zl_vdev_bmap); i++) { 578168404Spjd b = zilog->zl_vdev_bmap[i]; 579168404Spjd if (b == 0) 580168404Spjd continue; 581168404Spjd for (j = 0; j < 8; j++) { 582168404Spjd if (b & (1 << j)) { 583168404Spjd vdev = (i << 3) + j; 584168404Spjd zil_flush_vdev(spa, vdev, &zio); 585168404Spjd } 586168404Spjd } 587168404Spjd zilog->zl_vdev_bmap[i] = 0; 588168404Spjd } 589168404Spjd 590168404Spjd while ((zv = list_head(&zilog->zl_vdev_list)) != NULL) { 591168404Spjd zil_flush_vdev(spa, zv->vdev, &zio); 592168404Spjd list_remove(&zilog->zl_vdev_list, zv); 593168404Spjd kmem_free(zv, sizeof (zil_vdev_t)); 594168404Spjd } 595168404Spjd /* 596168404Spjd * Wait for all the flushes to complete. Not all devices actually 597168404Spjd * support the DKIOCFLUSHWRITECACHE ioctl, so it's OK if it fails. 598168404Spjd */ 599168404Spjd if (zio) 600168404Spjd (void) zio_wait(zio); 601168404Spjd} 602168404Spjd 603168404Spjd/* 604168404Spjd * Function called when a log block write completes 605168404Spjd */ 606168404Spjdstatic void 607168404Spjdzil_lwb_write_done(zio_t *zio) 608168404Spjd{ 609168404Spjd lwb_t *lwb = zio->io_private; 610168404Spjd zilog_t *zilog = lwb->lwb_zilog; 611168404Spjd 612168404Spjd /* 613168404Spjd * Now that we've written this log block, we have a stable pointer 614168404Spjd * to the next block in the chain, so it's OK to let the txg in 615168404Spjd * which we allocated the next block sync. 616168404Spjd */ 617168404Spjd txg_rele_to_sync(&lwb->lwb_txgh); 618168404Spjd 619168404Spjd zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); 620168404Spjd mutex_enter(&zilog->zl_lock); 621168404Spjd lwb->lwb_buf = NULL; 622168404Spjd if (zio->io_error) { 623168404Spjd zilog->zl_log_error = B_TRUE; 624168404Spjd mutex_exit(&zilog->zl_lock); 625168404Spjd return; 626168404Spjd } 627168404Spjd mutex_exit(&zilog->zl_lock); 628168404Spjd} 629168404Spjd 630168404Spjd/* 631168404Spjd * Initialize the io for a log block. 632168404Spjd * 633168404Spjd * Note, we should not initialize the IO until we are about 634168404Spjd * to use it, since zio_rewrite() does a spa_config_enter(). 635168404Spjd */ 636168404Spjdstatic void 637168404Spjdzil_lwb_write_init(zilog_t *zilog, lwb_t *lwb) 638168404Spjd{ 639168404Spjd zbookmark_t zb; 640168404Spjd 641168404Spjd zb.zb_objset = lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_OBJSET]; 642168404Spjd zb.zb_object = 0; 643168404Spjd zb.zb_level = -1; 644168404Spjd zb.zb_blkid = lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_SEQ]; 645168404Spjd 646168404Spjd if (zilog->zl_root_zio == NULL) { 647168404Spjd zilog->zl_root_zio = zio_root(zilog->zl_spa, NULL, NULL, 648168404Spjd ZIO_FLAG_CANFAIL); 649168404Spjd } 650168404Spjd if (lwb->lwb_zio == NULL) { 651168404Spjd lwb->lwb_zio = zio_rewrite(zilog->zl_root_zio, zilog->zl_spa, 652168404Spjd ZIO_CHECKSUM_ZILOG, 0, &lwb->lwb_blk, lwb->lwb_buf, 653168404Spjd lwb->lwb_sz, zil_lwb_write_done, lwb, 654168404Spjd ZIO_PRIORITY_LOG_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 655168404Spjd } 656168404Spjd} 657168404Spjd 658168404Spjd/* 659168404Spjd * Start a log block write and advance to the next log block. 660168404Spjd * Calls are serialized. 661168404Spjd */ 662168404Spjdstatic lwb_t * 663168404Spjdzil_lwb_write_start(zilog_t *zilog, lwb_t *lwb) 664168404Spjd{ 665168404Spjd lwb_t *nlwb; 666168404Spjd zil_trailer_t *ztp = (zil_trailer_t *)(lwb->lwb_buf + lwb->lwb_sz) - 1; 667168404Spjd spa_t *spa = zilog->zl_spa; 668168404Spjd blkptr_t *bp = &ztp->zit_next_blk; 669168404Spjd uint64_t txg; 670168404Spjd uint64_t zil_blksz; 671168404Spjd int error; 672168404Spjd 673168404Spjd ASSERT(lwb->lwb_nused <= ZIL_BLK_DATA_SZ(lwb)); 674168404Spjd 675168404Spjd /* 676168404Spjd * Allocate the next block and save its address in this block 677168404Spjd * before writing it in order to establish the log chain. 678168404Spjd * Note that if the allocation of nlwb synced before we wrote 679168404Spjd * the block that points at it (lwb), we'd leak it if we crashed. 680168404Spjd * Therefore, we don't do txg_rele_to_sync() until zil_lwb_write_done(). 681168404Spjd */ 682168404Spjd txg = txg_hold_open(zilog->zl_dmu_pool, &lwb->lwb_txgh); 683168404Spjd txg_rele_to_quiesce(&lwb->lwb_txgh); 684168404Spjd 685168404Spjd /* 686168404Spjd * Pick a ZIL blocksize. We request a size that is the 687168404Spjd * maximum of the previous used size, the current used size and 688168404Spjd * the amount waiting in the queue. 689168404Spjd */ 690168404Spjd zil_blksz = MAX(zilog->zl_prev_used, 691168404Spjd zilog->zl_cur_used + sizeof (*ztp)); 692168404Spjd zil_blksz = MAX(zil_blksz, zilog->zl_itx_list_sz + sizeof (*ztp)); 693168404Spjd zil_blksz = P2ROUNDUP_TYPED(zil_blksz, ZIL_MIN_BLKSZ, uint64_t); 694168404Spjd if (zil_blksz > ZIL_MAX_BLKSZ) 695168404Spjd zil_blksz = ZIL_MAX_BLKSZ; 696168404Spjd 697168404Spjd BP_ZERO(bp); 698168404Spjd /* pass the old blkptr in order to spread log blocks across devs */ 699168404Spjd error = zio_alloc_blk(spa, zil_blksz, bp, &lwb->lwb_blk, txg); 700168404Spjd if (error) { 701168404Spjd dmu_tx_t *tx = dmu_tx_create_assigned(zilog->zl_dmu_pool, txg); 702168404Spjd 703168404Spjd /* 704168404Spjd * We dirty the dataset to ensure that zil_sync() will 705168404Spjd * be called to remove this lwb from our zl_lwb_list. 706168404Spjd * Failing to do so, may leave an lwb with a NULL lwb_buf 707168404Spjd * hanging around on the zl_lwb_list. 708168404Spjd */ 709168404Spjd dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 710168404Spjd dmu_tx_commit(tx); 711168404Spjd 712168404Spjd /* 713168404Spjd * Since we've just experienced an allocation failure so we 714168404Spjd * terminate the current lwb and send it on its way. 715168404Spjd */ 716168404Spjd ztp->zit_pad = 0; 717168404Spjd ztp->zit_nused = lwb->lwb_nused; 718168404Spjd ztp->zit_bt.zbt_cksum = lwb->lwb_blk.blk_cksum; 719168404Spjd zio_nowait(lwb->lwb_zio); 720168404Spjd 721168404Spjd /* 722168404Spjd * By returning NULL the caller will call tx_wait_synced() 723168404Spjd */ 724168404Spjd return (NULL); 725168404Spjd } 726168404Spjd 727168404Spjd ASSERT3U(bp->blk_birth, ==, txg); 728168404Spjd ztp->zit_pad = 0; 729168404Spjd ztp->zit_nused = lwb->lwb_nused; 730168404Spjd ztp->zit_bt.zbt_cksum = lwb->lwb_blk.blk_cksum; 731168404Spjd bp->blk_cksum = lwb->lwb_blk.blk_cksum; 732168404Spjd bp->blk_cksum.zc_word[ZIL_ZC_SEQ]++; 733168404Spjd 734168404Spjd /* 735168404Spjd * Allocate a new log write buffer (lwb). 736168404Spjd */ 737168404Spjd nlwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP); 738168404Spjd 739168404Spjd nlwb->lwb_zilog = zilog; 740168404Spjd nlwb->lwb_blk = *bp; 741168404Spjd nlwb->lwb_nused = 0; 742168404Spjd nlwb->lwb_sz = BP_GET_LSIZE(&nlwb->lwb_blk); 743168404Spjd nlwb->lwb_buf = zio_buf_alloc(nlwb->lwb_sz); 744168404Spjd nlwb->lwb_max_txg = txg; 745168404Spjd nlwb->lwb_zio = NULL; 746168404Spjd 747168404Spjd /* 748168404Spjd * Put new lwb at the end of the log chain 749168404Spjd */ 750168404Spjd mutex_enter(&zilog->zl_lock); 751168404Spjd list_insert_tail(&zilog->zl_lwb_list, nlwb); 752168404Spjd mutex_exit(&zilog->zl_lock); 753168404Spjd 754168404Spjd /* Record the vdev for later flushing */ 755168404Spjd zil_add_vdev(zilog, DVA_GET_VDEV(BP_IDENTITY(&(lwb->lwb_blk)))); 756168404Spjd 757168404Spjd /* 758168404Spjd * kick off the write for the old log block 759168404Spjd */ 760168404Spjd dprintf_bp(&lwb->lwb_blk, "lwb %p txg %llu: ", lwb, txg); 761168404Spjd ASSERT(lwb->lwb_zio); 762168404Spjd zio_nowait(lwb->lwb_zio); 763168404Spjd 764168404Spjd return (nlwb); 765168404Spjd} 766168404Spjd 767168404Spjdstatic lwb_t * 768168404Spjdzil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb) 769168404Spjd{ 770168404Spjd lr_t *lrc = &itx->itx_lr; /* common log record */ 771168404Spjd lr_write_t *lr = (lr_write_t *)lrc; 772168404Spjd uint64_t txg = lrc->lrc_txg; 773168404Spjd uint64_t reclen = lrc->lrc_reclen; 774168404Spjd uint64_t dlen; 775168404Spjd 776168404Spjd if (lwb == NULL) 777168404Spjd return (NULL); 778168404Spjd ASSERT(lwb->lwb_buf != NULL); 779168404Spjd 780168404Spjd if (lrc->lrc_txtype == TX_WRITE && itx->itx_wr_state == WR_NEED_COPY) 781168404Spjd dlen = P2ROUNDUP_TYPED( 782168404Spjd lr->lr_length, sizeof (uint64_t), uint64_t); 783168404Spjd else 784168404Spjd dlen = 0; 785168404Spjd 786168404Spjd zilog->zl_cur_used += (reclen + dlen); 787168404Spjd 788168404Spjd zil_lwb_write_init(zilog, lwb); 789168404Spjd 790168404Spjd /* 791168404Spjd * If this record won't fit in the current log block, start a new one. 792168404Spjd */ 793168404Spjd if (lwb->lwb_nused + reclen + dlen > ZIL_BLK_DATA_SZ(lwb)) { 794168404Spjd lwb = zil_lwb_write_start(zilog, lwb); 795168404Spjd if (lwb == NULL) 796168404Spjd return (NULL); 797168404Spjd zil_lwb_write_init(zilog, lwb); 798168404Spjd ASSERT(lwb->lwb_nused == 0); 799168404Spjd if (reclen + dlen > ZIL_BLK_DATA_SZ(lwb)) { 800168404Spjd txg_wait_synced(zilog->zl_dmu_pool, txg); 801168404Spjd return (lwb); 802168404Spjd } 803168404Spjd } 804168404Spjd 805168404Spjd /* 806168404Spjd * Update the lrc_seq, to be log record sequence number. See zil.h 807168404Spjd * Then copy the record to the log buffer. 808168404Spjd */ 809168404Spjd lrc->lrc_seq = ++zilog->zl_lr_seq; /* we are single threaded */ 810168404Spjd bcopy(lrc, lwb->lwb_buf + lwb->lwb_nused, reclen); 811168404Spjd 812168404Spjd /* 813168404Spjd * If it's a write, fetch the data or get its blkptr as appropriate. 814168404Spjd */ 815168404Spjd if (lrc->lrc_txtype == TX_WRITE) { 816168404Spjd if (txg > spa_freeze_txg(zilog->zl_spa)) 817168404Spjd txg_wait_synced(zilog->zl_dmu_pool, txg); 818168404Spjd if (itx->itx_wr_state != WR_COPIED) { 819168404Spjd char *dbuf; 820168404Spjd int error; 821168404Spjd 822168404Spjd /* alignment is guaranteed */ 823168404Spjd lr = (lr_write_t *)(lwb->lwb_buf + lwb->lwb_nused); 824168404Spjd if (dlen) { 825168404Spjd ASSERT(itx->itx_wr_state == WR_NEED_COPY); 826168404Spjd dbuf = lwb->lwb_buf + lwb->lwb_nused + reclen; 827168404Spjd lr->lr_common.lrc_reclen += dlen; 828168404Spjd } else { 829168404Spjd ASSERT(itx->itx_wr_state == WR_INDIRECT); 830168404Spjd dbuf = NULL; 831168404Spjd } 832168404Spjd error = zilog->zl_get_data( 833168404Spjd itx->itx_private, lr, dbuf, lwb->lwb_zio); 834168404Spjd if (error) { 835168404Spjd ASSERT(error == ENOENT || error == EEXIST || 836168404Spjd error == EALREADY); 837168404Spjd return (lwb); 838168404Spjd } 839168404Spjd } 840168404Spjd } 841168404Spjd 842168404Spjd lwb->lwb_nused += reclen + dlen; 843168404Spjd lwb->lwb_max_txg = MAX(lwb->lwb_max_txg, txg); 844168404Spjd ASSERT3U(lwb->lwb_nused, <=, ZIL_BLK_DATA_SZ(lwb)); 845168404Spjd ASSERT3U(P2PHASE(lwb->lwb_nused, sizeof (uint64_t)), ==, 0); 846168404Spjd 847168404Spjd return (lwb); 848168404Spjd} 849168404Spjd 850168404Spjditx_t * 851168404Spjdzil_itx_create(int txtype, size_t lrsize) 852168404Spjd{ 853168404Spjd itx_t *itx; 854168404Spjd 855168404Spjd lrsize = P2ROUNDUP_TYPED(lrsize, sizeof (uint64_t), size_t); 856168404Spjd 857168404Spjd itx = kmem_alloc(offsetof(itx_t, itx_lr) + lrsize, KM_SLEEP); 858168404Spjd itx->itx_lr.lrc_txtype = txtype; 859168404Spjd itx->itx_lr.lrc_reclen = lrsize; 860168404Spjd itx->itx_lr.lrc_seq = 0; /* defensive */ 861168404Spjd 862168404Spjd return (itx); 863168404Spjd} 864168404Spjd 865168404Spjduint64_t 866168404Spjdzil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx) 867168404Spjd{ 868168404Spjd uint64_t seq; 869168404Spjd 870168404Spjd ASSERT(itx->itx_lr.lrc_seq == 0); 871168404Spjd 872168404Spjd mutex_enter(&zilog->zl_lock); 873168404Spjd list_insert_tail(&zilog->zl_itx_list, itx); 874168404Spjd zilog->zl_itx_list_sz += itx->itx_lr.lrc_reclen; 875168404Spjd itx->itx_lr.lrc_txg = dmu_tx_get_txg(tx); 876168404Spjd itx->itx_lr.lrc_seq = seq = ++zilog->zl_itx_seq; 877168404Spjd mutex_exit(&zilog->zl_lock); 878168404Spjd 879168404Spjd return (seq); 880168404Spjd} 881168404Spjd 882168404Spjd/* 883168404Spjd * Free up all in-memory intent log transactions that have now been synced. 884168404Spjd */ 885168404Spjdstatic void 886168404Spjdzil_itx_clean(zilog_t *zilog) 887168404Spjd{ 888168404Spjd uint64_t synced_txg = spa_last_synced_txg(zilog->zl_spa); 889168404Spjd uint64_t freeze_txg = spa_freeze_txg(zilog->zl_spa); 890168404Spjd list_t clean_list; 891168404Spjd itx_t *itx; 892168404Spjd 893168404Spjd list_create(&clean_list, sizeof (itx_t), offsetof(itx_t, itx_node)); 894168404Spjd 895168404Spjd mutex_enter(&zilog->zl_lock); 896168404Spjd /* wait for a log writer to finish walking list */ 897168404Spjd while (zilog->zl_writer) { 898168404Spjd cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock); 899168404Spjd } 900168404Spjd 901168404Spjd /* 902168404Spjd * Move the sync'd log transactions to a separate list so we can call 903168404Spjd * kmem_free without holding the zl_lock. 904168404Spjd * 905168404Spjd * There is no need to set zl_writer as we don't drop zl_lock here 906168404Spjd */ 907168404Spjd while ((itx = list_head(&zilog->zl_itx_list)) != NULL && 908168404Spjd itx->itx_lr.lrc_txg <= MIN(synced_txg, freeze_txg)) { 909168404Spjd list_remove(&zilog->zl_itx_list, itx); 910168404Spjd zilog->zl_itx_list_sz -= itx->itx_lr.lrc_reclen; 911168404Spjd list_insert_tail(&clean_list, itx); 912168404Spjd } 913168404Spjd cv_broadcast(&zilog->zl_cv_writer); 914168404Spjd mutex_exit(&zilog->zl_lock); 915168404Spjd 916168404Spjd /* destroy sync'd log transactions */ 917168404Spjd while ((itx = list_head(&clean_list)) != NULL) { 918168404Spjd list_remove(&clean_list, itx); 919168404Spjd kmem_free(itx, offsetof(itx_t, itx_lr) 920168404Spjd + itx->itx_lr.lrc_reclen); 921168404Spjd } 922168404Spjd list_destroy(&clean_list); 923168404Spjd} 924168404Spjd 925168404Spjd/* 926168404Spjd * If there are any in-memory intent log transactions which have now been 927168404Spjd * synced then start up a taskq to free them. 928168404Spjd */ 929168404Spjdvoid 930168404Spjdzil_clean(zilog_t *zilog) 931168404Spjd{ 932168404Spjd itx_t *itx; 933168404Spjd 934168404Spjd mutex_enter(&zilog->zl_lock); 935168404Spjd itx = list_head(&zilog->zl_itx_list); 936168404Spjd if ((itx != NULL) && 937168404Spjd (itx->itx_lr.lrc_txg <= spa_last_synced_txg(zilog->zl_spa))) { 938168404Spjd (void) taskq_dispatch(zilog->zl_clean_taskq, 939168404Spjd (void (*)(void *))zil_itx_clean, zilog, TQ_NOSLEEP); 940168404Spjd } 941168404Spjd mutex_exit(&zilog->zl_lock); 942168404Spjd} 943168404Spjd 944168404Spjdvoid 945168404Spjdzil_commit_writer(zilog_t *zilog, uint64_t seq, uint64_t foid) 946168404Spjd{ 947168404Spjd uint64_t txg; 948168404Spjd uint64_t reclen; 949168404Spjd uint64_t commit_seq = 0; 950168404Spjd itx_t *itx, *itx_next = (itx_t *)-1; 951168404Spjd lwb_t *lwb; 952168404Spjd spa_t *spa; 953168404Spjd 954168404Spjd zilog->zl_writer = B_TRUE; 955168404Spjd zilog->zl_root_zio = NULL; 956168404Spjd spa = zilog->zl_spa; 957168404Spjd 958168404Spjd if (zilog->zl_suspend) { 959168404Spjd lwb = NULL; 960168404Spjd } else { 961168404Spjd lwb = list_tail(&zilog->zl_lwb_list); 962168404Spjd if (lwb == NULL) { 963168404Spjd /* 964168404Spjd * Return if there's nothing to flush before we 965168404Spjd * dirty the fs by calling zil_create() 966168404Spjd */ 967168404Spjd if (list_is_empty(&zilog->zl_itx_list)) { 968168404Spjd zilog->zl_writer = B_FALSE; 969168404Spjd return; 970168404Spjd } 971168404Spjd mutex_exit(&zilog->zl_lock); 972168404Spjd zil_create(zilog); 973168404Spjd mutex_enter(&zilog->zl_lock); 974168404Spjd lwb = list_tail(&zilog->zl_lwb_list); 975168404Spjd } 976168404Spjd } 977168404Spjd 978168404Spjd /* Loop through in-memory log transactions filling log blocks. */ 979168404Spjd DTRACE_PROBE1(zil__cw1, zilog_t *, zilog); 980168404Spjd for (;;) { 981168404Spjd /* 982168404Spjd * Find the next itx to push: 983168404Spjd * Push all transactions related to specified foid and all 984168404Spjd * other transactions except TX_WRITE, TX_TRUNCATE, 985168404Spjd * TX_SETATTR and TX_ACL for all other files. 986168404Spjd */ 987168404Spjd if (itx_next != (itx_t *)-1) 988168404Spjd itx = itx_next; 989168404Spjd else 990168404Spjd itx = list_head(&zilog->zl_itx_list); 991168404Spjd for (; itx != NULL; itx = list_next(&zilog->zl_itx_list, itx)) { 992168404Spjd if (foid == 0) /* push all foids? */ 993168404Spjd break; 994168404Spjd if (itx->itx_sync) /* push all O_[D]SYNC */ 995168404Spjd break; 996168404Spjd switch (itx->itx_lr.lrc_txtype) { 997168404Spjd case TX_SETATTR: 998168404Spjd case TX_WRITE: 999168404Spjd case TX_TRUNCATE: 1000168404Spjd case TX_ACL: 1001168404Spjd /* lr_foid is same offset for these records */ 1002168404Spjd if (((lr_write_t *)&itx->itx_lr)->lr_foid 1003168404Spjd != foid) { 1004168404Spjd continue; /* skip this record */ 1005168404Spjd } 1006168404Spjd } 1007168404Spjd break; 1008168404Spjd } 1009168404Spjd if (itx == NULL) 1010168404Spjd break; 1011168404Spjd 1012168404Spjd reclen = itx->itx_lr.lrc_reclen; 1013168404Spjd if ((itx->itx_lr.lrc_seq > seq) && 1014168404Spjd ((lwb == NULL) || (lwb->lwb_nused == 0) || 1015168404Spjd (lwb->lwb_nused + reclen > ZIL_BLK_DATA_SZ(lwb)))) { 1016168404Spjd break; 1017168404Spjd } 1018168404Spjd 1019168404Spjd /* 1020168404Spjd * Save the next pointer. Even though we soon drop 1021168404Spjd * zl_lock all threads that may change the list 1022168404Spjd * (another writer or zil_itx_clean) can't do so until 1023168404Spjd * they have zl_writer. 1024168404Spjd */ 1025168404Spjd itx_next = list_next(&zilog->zl_itx_list, itx); 1026168404Spjd list_remove(&zilog->zl_itx_list, itx); 1027168404Spjd mutex_exit(&zilog->zl_lock); 1028168404Spjd txg = itx->itx_lr.lrc_txg; 1029168404Spjd ASSERT(txg); 1030168404Spjd 1031168404Spjd if (txg > spa_last_synced_txg(spa) || 1032168404Spjd txg > spa_freeze_txg(spa)) 1033168404Spjd lwb = zil_lwb_commit(zilog, itx, lwb); 1034168404Spjd kmem_free(itx, offsetof(itx_t, itx_lr) 1035168404Spjd + itx->itx_lr.lrc_reclen); 1036168404Spjd mutex_enter(&zilog->zl_lock); 1037168404Spjd zilog->zl_itx_list_sz -= reclen; 1038168404Spjd } 1039168404Spjd DTRACE_PROBE1(zil__cw2, zilog_t *, zilog); 1040168404Spjd /* determine commit sequence number */ 1041168404Spjd itx = list_head(&zilog->zl_itx_list); 1042168404Spjd if (itx) 1043168404Spjd commit_seq = itx->itx_lr.lrc_seq; 1044168404Spjd else 1045168404Spjd commit_seq = zilog->zl_itx_seq; 1046168404Spjd mutex_exit(&zilog->zl_lock); 1047168404Spjd 1048168404Spjd /* write the last block out */ 1049168404Spjd if (lwb != NULL && lwb->lwb_zio != NULL) 1050168404Spjd lwb = zil_lwb_write_start(zilog, lwb); 1051168404Spjd 1052168404Spjd zilog->zl_prev_used = zilog->zl_cur_used; 1053168404Spjd zilog->zl_cur_used = 0; 1054168404Spjd 1055168404Spjd /* 1056168404Spjd * Wait if necessary for the log blocks to be on stable storage. 1057168404Spjd */ 1058168404Spjd if (zilog->zl_root_zio) { 1059168404Spjd DTRACE_PROBE1(zil__cw3, zilog_t *, zilog); 1060168404Spjd (void) zio_wait(zilog->zl_root_zio); 1061168404Spjd DTRACE_PROBE1(zil__cw4, zilog_t *, zilog); 1062168404Spjd if (!zfs_nocacheflush) 1063168404Spjd zil_flush_vdevs(zilog); 1064168404Spjd } 1065168404Spjd 1066168404Spjd if (zilog->zl_log_error || lwb == NULL) { 1067168404Spjd zilog->zl_log_error = 0; 1068168404Spjd txg_wait_synced(zilog->zl_dmu_pool, 0); 1069168404Spjd } 1070168404Spjd 1071168404Spjd mutex_enter(&zilog->zl_lock); 1072168404Spjd zilog->zl_writer = B_FALSE; 1073168404Spjd 1074168404Spjd ASSERT3U(commit_seq, >=, zilog->zl_commit_seq); 1075168404Spjd zilog->zl_commit_seq = commit_seq; 1076168404Spjd} 1077168404Spjd 1078168404Spjd/* 1079168404Spjd * Push zfs transactions to stable storage up to the supplied sequence number. 1080168404Spjd * If foid is 0 push out all transactions, otherwise push only those 1081168404Spjd * for that file or might have been used to create that file. 1082168404Spjd */ 1083168404Spjdvoid 1084168404Spjdzil_commit(zilog_t *zilog, uint64_t seq, uint64_t foid) 1085168404Spjd{ 1086168404Spjd if (zilog == NULL || seq == 0) 1087168404Spjd return; 1088168404Spjd 1089168404Spjd mutex_enter(&zilog->zl_lock); 1090168404Spjd 1091168404Spjd seq = MIN(seq, zilog->zl_itx_seq); /* cap seq at largest itx seq */ 1092168404Spjd 1093168404Spjd while (zilog->zl_writer) { 1094168404Spjd cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock); 1095168404Spjd if (seq < zilog->zl_commit_seq) { 1096168404Spjd mutex_exit(&zilog->zl_lock); 1097168404Spjd return; 1098168404Spjd } 1099168404Spjd } 1100168404Spjd zil_commit_writer(zilog, seq, foid); /* drops zl_lock */ 1101168404Spjd /* wake up others waiting on the commit */ 1102168404Spjd cv_broadcast(&zilog->zl_cv_writer); 1103168404Spjd mutex_exit(&zilog->zl_lock); 1104168404Spjd} 1105168404Spjd 1106168404Spjd/* 1107168404Spjd * Called in syncing context to free committed log blocks and update log header. 1108168404Spjd */ 1109168404Spjdvoid 1110168404Spjdzil_sync(zilog_t *zilog, dmu_tx_t *tx) 1111168404Spjd{ 1112168404Spjd zil_header_t *zh = zil_header_in_syncing_context(zilog); 1113168404Spjd uint64_t txg = dmu_tx_get_txg(tx); 1114168404Spjd spa_t *spa = zilog->zl_spa; 1115168404Spjd lwb_t *lwb; 1116168404Spjd 1117168404Spjd mutex_enter(&zilog->zl_lock); 1118168404Spjd 1119168404Spjd ASSERT(zilog->zl_stop_sync == 0); 1120168404Spjd 1121168404Spjd zh->zh_replay_seq = zilog->zl_replay_seq[txg & TXG_MASK]; 1122168404Spjd 1123168404Spjd if (zilog->zl_destroy_txg == txg) { 1124168404Spjd blkptr_t blk = zh->zh_log; 1125168404Spjd 1126168404Spjd ASSERT(list_head(&zilog->zl_lwb_list) == NULL); 1127168404Spjd ASSERT(spa_sync_pass(spa) == 1); 1128168404Spjd 1129168404Spjd bzero(zh, sizeof (zil_header_t)); 1130168404Spjd bzero(zilog->zl_replay_seq, sizeof (zilog->zl_replay_seq)); 1131168404Spjd 1132168404Spjd if (zilog->zl_keep_first) { 1133168404Spjd /* 1134168404Spjd * If this block was part of log chain that couldn't 1135168404Spjd * be claimed because a device was missing during 1136168404Spjd * zil_claim(), but that device later returns, 1137168404Spjd * then this block could erroneously appear valid. 1138168404Spjd * To guard against this, assign a new GUID to the new 1139168404Spjd * log chain so it doesn't matter what blk points to. 1140168404Spjd */ 1141168404Spjd zil_init_log_chain(zilog, &blk); 1142168404Spjd zh->zh_log = blk; 1143168404Spjd } 1144168404Spjd } 1145168404Spjd 1146168404Spjd for (;;) { 1147168404Spjd lwb = list_head(&zilog->zl_lwb_list); 1148168404Spjd if (lwb == NULL) { 1149168404Spjd mutex_exit(&zilog->zl_lock); 1150168404Spjd return; 1151168404Spjd } 1152168404Spjd zh->zh_log = lwb->lwb_blk; 1153168404Spjd if (lwb->lwb_buf != NULL || lwb->lwb_max_txg > txg) 1154168404Spjd break; 1155168404Spjd list_remove(&zilog->zl_lwb_list, lwb); 1156168404Spjd zio_free_blk(spa, &lwb->lwb_blk, txg); 1157168404Spjd kmem_cache_free(zil_lwb_cache, lwb); 1158168404Spjd 1159168404Spjd /* 1160168404Spjd * If we don't have anything left in the lwb list then 1161168404Spjd * we've had an allocation failure and we need to zero 1162168404Spjd * out the zil_header blkptr so that we don't end 1163168404Spjd * up freeing the same block twice. 1164168404Spjd */ 1165168404Spjd if (list_head(&zilog->zl_lwb_list) == NULL) 1166168404Spjd BP_ZERO(&zh->zh_log); 1167168404Spjd } 1168168404Spjd mutex_exit(&zilog->zl_lock); 1169168404Spjd} 1170168404Spjd 1171168404Spjdvoid 1172168404Spjdzil_init(void) 1173168404Spjd{ 1174168404Spjd zil_lwb_cache = kmem_cache_create("zil_lwb_cache", 1175168404Spjd sizeof (struct lwb), 0, NULL, NULL, NULL, NULL, NULL, 0); 1176168404Spjd} 1177168404Spjd 1178168404Spjdvoid 1179168404Spjdzil_fini(void) 1180168404Spjd{ 1181168404Spjd kmem_cache_destroy(zil_lwb_cache); 1182168404Spjd} 1183168404Spjd 1184168404Spjdzilog_t * 1185168404Spjdzil_alloc(objset_t *os, zil_header_t *zh_phys) 1186168404Spjd{ 1187168404Spjd zilog_t *zilog; 1188168404Spjd 1189168404Spjd zilog = kmem_zalloc(sizeof (zilog_t), KM_SLEEP); 1190168404Spjd 1191168404Spjd zilog->zl_header = zh_phys; 1192168404Spjd zilog->zl_os = os; 1193168404Spjd zilog->zl_spa = dmu_objset_spa(os); 1194168404Spjd zilog->zl_dmu_pool = dmu_objset_pool(os); 1195168404Spjd zilog->zl_destroy_txg = TXG_INITIAL - 1; 1196168404Spjd 1197168404Spjd mutex_init(&zilog->zl_lock, NULL, MUTEX_DEFAULT, NULL); 1198168404Spjd cv_init(&zilog->zl_cv_writer, NULL, CV_DEFAULT, NULL); 1199168404Spjd cv_init(&zilog->zl_cv_suspend, NULL, CV_DEFAULT, NULL); 1200168404Spjd 1201168404Spjd list_create(&zilog->zl_itx_list, sizeof (itx_t), 1202168404Spjd offsetof(itx_t, itx_node)); 1203168404Spjd 1204168404Spjd list_create(&zilog->zl_lwb_list, sizeof (lwb_t), 1205168404Spjd offsetof(lwb_t, lwb_node)); 1206168404Spjd 1207168404Spjd list_create(&zilog->zl_vdev_list, sizeof (zil_vdev_t), 1208168404Spjd offsetof(zil_vdev_t, vdev_seq_node)); 1209168404Spjd 1210168404Spjd return (zilog); 1211168404Spjd} 1212168404Spjd 1213168404Spjdvoid 1214168404Spjdzil_free(zilog_t *zilog) 1215168404Spjd{ 1216168404Spjd lwb_t *lwb; 1217168404Spjd zil_vdev_t *zv; 1218168404Spjd 1219168404Spjd zilog->zl_stop_sync = 1; 1220168404Spjd 1221168404Spjd while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) { 1222168404Spjd list_remove(&zilog->zl_lwb_list, lwb); 1223168404Spjd if (lwb->lwb_buf != NULL) 1224168404Spjd zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); 1225168404Spjd kmem_cache_free(zil_lwb_cache, lwb); 1226168404Spjd } 1227168404Spjd list_destroy(&zilog->zl_lwb_list); 1228168404Spjd 1229168404Spjd while ((zv = list_head(&zilog->zl_vdev_list)) != NULL) { 1230168404Spjd list_remove(&zilog->zl_vdev_list, zv); 1231168404Spjd kmem_free(zv, sizeof (zil_vdev_t)); 1232168404Spjd } 1233168404Spjd list_destroy(&zilog->zl_vdev_list); 1234168404Spjd 1235168404Spjd ASSERT(list_head(&zilog->zl_itx_list) == NULL); 1236168404Spjd list_destroy(&zilog->zl_itx_list); 1237168404Spjd cv_destroy(&zilog->zl_cv_suspend); 1238168404Spjd cv_destroy(&zilog->zl_cv_writer); 1239168404Spjd mutex_destroy(&zilog->zl_lock); 1240168404Spjd 1241168404Spjd kmem_free(zilog, sizeof (zilog_t)); 1242168404Spjd} 1243168404Spjd 1244168404Spjd/* 1245168404Spjd * return true if the initial log block is not valid 1246168404Spjd */ 1247168404Spjdstatic int 1248168404Spjdzil_empty(zilog_t *zilog) 1249168404Spjd{ 1250168404Spjd const zil_header_t *zh = zilog->zl_header; 1251168404Spjd arc_buf_t *abuf = NULL; 1252168404Spjd 1253168404Spjd if (BP_IS_HOLE(&zh->zh_log)) 1254168404Spjd return (1); 1255168404Spjd 1256168404Spjd if (zil_read_log_block(zilog, &zh->zh_log, &abuf) != 0) 1257168404Spjd return (1); 1258168404Spjd 1259168404Spjd VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); 1260168404Spjd return (0); 1261168404Spjd} 1262168404Spjd 1263168404Spjd/* 1264168404Spjd * Open an intent log. 1265168404Spjd */ 1266168404Spjdzilog_t * 1267168404Spjdzil_open(objset_t *os, zil_get_data_t *get_data) 1268168404Spjd{ 1269168404Spjd zilog_t *zilog = dmu_objset_zil(os); 1270168404Spjd 1271168404Spjd zilog->zl_get_data = get_data; 1272168404Spjd zilog->zl_clean_taskq = taskq_create("zil_clean", 1, minclsyspri, 1273168404Spjd 2, 2, TASKQ_PREPOPULATE); 1274168404Spjd 1275168404Spjd return (zilog); 1276168404Spjd} 1277168404Spjd 1278168404Spjd/* 1279168404Spjd * Close an intent log. 1280168404Spjd */ 1281168404Spjdvoid 1282168404Spjdzil_close(zilog_t *zilog) 1283168404Spjd{ 1284168404Spjd /* 1285168404Spjd * If the log isn't already committed, mark the objset dirty 1286168404Spjd * (so zil_sync() will be called) and wait for that txg to sync. 1287168404Spjd */ 1288168404Spjd if (!zil_is_committed(zilog)) { 1289168404Spjd uint64_t txg; 1290168404Spjd dmu_tx_t *tx = dmu_tx_create(zilog->zl_os); 1291168404Spjd (void) dmu_tx_assign(tx, TXG_WAIT); 1292168404Spjd dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 1293168404Spjd txg = dmu_tx_get_txg(tx); 1294168404Spjd dmu_tx_commit(tx); 1295168404Spjd txg_wait_synced(zilog->zl_dmu_pool, txg); 1296168404Spjd } 1297168404Spjd 1298168404Spjd taskq_destroy(zilog->zl_clean_taskq); 1299168404Spjd zilog->zl_clean_taskq = NULL; 1300168404Spjd zilog->zl_get_data = NULL; 1301168404Spjd 1302168404Spjd zil_itx_clean(zilog); 1303168404Spjd ASSERT(list_head(&zilog->zl_itx_list) == NULL); 1304168404Spjd} 1305168404Spjd 1306168404Spjd/* 1307168404Spjd * Suspend an intent log. While in suspended mode, we still honor 1308168404Spjd * synchronous semantics, but we rely on txg_wait_synced() to do it. 1309168404Spjd * We suspend the log briefly when taking a snapshot so that the snapshot 1310168404Spjd * contains all the data it's supposed to, and has an empty intent log. 1311168404Spjd */ 1312168404Spjdint 1313168404Spjdzil_suspend(zilog_t *zilog) 1314168404Spjd{ 1315168404Spjd const zil_header_t *zh = zilog->zl_header; 1316168404Spjd 1317168404Spjd mutex_enter(&zilog->zl_lock); 1318168404Spjd if (zh->zh_claim_txg != 0) { /* unplayed log */ 1319168404Spjd mutex_exit(&zilog->zl_lock); 1320168404Spjd return (EBUSY); 1321168404Spjd } 1322168404Spjd if (zilog->zl_suspend++ != 0) { 1323168404Spjd /* 1324168404Spjd * Someone else already began a suspend. 1325168404Spjd * Just wait for them to finish. 1326168404Spjd */ 1327168404Spjd while (zilog->zl_suspending) 1328168404Spjd cv_wait(&zilog->zl_cv_suspend, &zilog->zl_lock); 1329168404Spjd ASSERT(BP_IS_HOLE(&zh->zh_log)); 1330168404Spjd mutex_exit(&zilog->zl_lock); 1331168404Spjd return (0); 1332168404Spjd } 1333168404Spjd zilog->zl_suspending = B_TRUE; 1334168404Spjd mutex_exit(&zilog->zl_lock); 1335168404Spjd 1336168404Spjd zil_commit(zilog, UINT64_MAX, 0); 1337168404Spjd 1338168404Spjd /* 1339168404Spjd * Wait for any in-flight log writes to complete. 1340168404Spjd */ 1341168404Spjd mutex_enter(&zilog->zl_lock); 1342168404Spjd while (zilog->zl_writer) 1343168404Spjd cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock); 1344168404Spjd mutex_exit(&zilog->zl_lock); 1345168404Spjd 1346168404Spjd zil_destroy(zilog, B_FALSE); 1347168404Spjd 1348168404Spjd mutex_enter(&zilog->zl_lock); 1349168404Spjd ASSERT(BP_IS_HOLE(&zh->zh_log)); 1350168404Spjd zilog->zl_suspending = B_FALSE; 1351168404Spjd cv_broadcast(&zilog->zl_cv_suspend); 1352168404Spjd mutex_exit(&zilog->zl_lock); 1353168404Spjd 1354168404Spjd return (0); 1355168404Spjd} 1356168404Spjd 1357168404Spjdvoid 1358168404Spjdzil_resume(zilog_t *zilog) 1359168404Spjd{ 1360168404Spjd mutex_enter(&zilog->zl_lock); 1361168404Spjd ASSERT(zilog->zl_suspend != 0); 1362168404Spjd zilog->zl_suspend--; 1363168404Spjd mutex_exit(&zilog->zl_lock); 1364168404Spjd} 1365168404Spjd 1366168404Spjdtypedef struct zil_replay_arg { 1367168404Spjd objset_t *zr_os; 1368168404Spjd zil_replay_func_t **zr_replay; 1369168404Spjd void *zr_arg; 1370168404Spjd uint64_t *zr_txgp; 1371168404Spjd boolean_t zr_byteswap; 1372168404Spjd char *zr_lrbuf; 1373168404Spjd} zil_replay_arg_t; 1374168404Spjd 1375168404Spjdstatic void 1376168404Spjdzil_replay_log_record(zilog_t *zilog, lr_t *lr, void *zra, uint64_t claim_txg) 1377168404Spjd{ 1378168404Spjd zil_replay_arg_t *zr = zra; 1379168404Spjd const zil_header_t *zh = zilog->zl_header; 1380168404Spjd uint64_t reclen = lr->lrc_reclen; 1381168404Spjd uint64_t txtype = lr->lrc_txtype; 1382168404Spjd char *name; 1383168404Spjd int pass, error, sunk; 1384168404Spjd 1385168404Spjd if (zilog->zl_stop_replay) 1386168404Spjd return; 1387168404Spjd 1388168404Spjd if (lr->lrc_txg < claim_txg) /* already committed */ 1389168404Spjd return; 1390168404Spjd 1391168404Spjd if (lr->lrc_seq <= zh->zh_replay_seq) /* already replayed */ 1392168404Spjd return; 1393168404Spjd 1394168404Spjd /* 1395168404Spjd * Make a copy of the data so we can revise and extend it. 1396168404Spjd */ 1397168404Spjd bcopy(lr, zr->zr_lrbuf, reclen); 1398168404Spjd 1399168404Spjd /* 1400168404Spjd * The log block containing this lr may have been byteswapped 1401168404Spjd * so that we can easily examine common fields like lrc_txtype. 1402168404Spjd * However, the log is a mix of different data types, and only the 1403168404Spjd * replay vectors know how to byteswap their records. Therefore, if 1404168404Spjd * the lr was byteswapped, undo it before invoking the replay vector. 1405168404Spjd */ 1406168404Spjd if (zr->zr_byteswap) 1407168404Spjd byteswap_uint64_array(zr->zr_lrbuf, reclen); 1408168404Spjd 1409168404Spjd /* 1410168404Spjd * If this is a TX_WRITE with a blkptr, suck in the data. 1411168404Spjd */ 1412168404Spjd if (txtype == TX_WRITE && reclen == sizeof (lr_write_t)) { 1413168404Spjd lr_write_t *lrw = (lr_write_t *)lr; 1414168404Spjd blkptr_t *wbp = &lrw->lr_blkptr; 1415168404Spjd uint64_t wlen = lrw->lr_length; 1416168404Spjd char *wbuf = zr->zr_lrbuf + reclen; 1417168404Spjd 1418168404Spjd if (BP_IS_HOLE(wbp)) { /* compressed to a hole */ 1419168404Spjd bzero(wbuf, wlen); 1420168404Spjd } else { 1421168404Spjd /* 1422168404Spjd * A subsequent write may have overwritten this block, 1423168404Spjd * in which case wbp may have been been freed and 1424168404Spjd * reallocated, and our read of wbp may fail with a 1425168404Spjd * checksum error. We can safely ignore this because 1426168404Spjd * the later write will provide the correct data. 1427168404Spjd */ 1428168404Spjd zbookmark_t zb; 1429168404Spjd 1430168404Spjd zb.zb_objset = dmu_objset_id(zilog->zl_os); 1431168404Spjd zb.zb_object = lrw->lr_foid; 1432168404Spjd zb.zb_level = -1; 1433168404Spjd zb.zb_blkid = lrw->lr_offset / BP_GET_LSIZE(wbp); 1434168404Spjd 1435168404Spjd (void) zio_wait(zio_read(NULL, zilog->zl_spa, 1436168404Spjd wbp, wbuf, BP_GET_LSIZE(wbp), NULL, NULL, 1437168404Spjd ZIO_PRIORITY_SYNC_READ, 1438168404Spjd ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &zb)); 1439168404Spjd (void) memmove(wbuf, wbuf + lrw->lr_blkoff, wlen); 1440168404Spjd } 1441168404Spjd } 1442168404Spjd 1443168404Spjd /* 1444168404Spjd * We must now do two things atomically: replay this log record, 1445168404Spjd * and update the log header to reflect the fact that we did so. 1446168404Spjd * We use the DMU's ability to assign into a specific txg to do this. 1447168404Spjd */ 1448168404Spjd for (pass = 1, sunk = B_FALSE; /* CONSTANTCONDITION */; pass++) { 1449168404Spjd uint64_t replay_txg; 1450168404Spjd dmu_tx_t *replay_tx; 1451168404Spjd 1452168404Spjd replay_tx = dmu_tx_create(zr->zr_os); 1453168404Spjd error = dmu_tx_assign(replay_tx, TXG_WAIT); 1454168404Spjd if (error) { 1455168404Spjd dmu_tx_abort(replay_tx); 1456168404Spjd break; 1457168404Spjd } 1458168404Spjd 1459168404Spjd replay_txg = dmu_tx_get_txg(replay_tx); 1460168404Spjd 1461168404Spjd if (txtype == 0 || txtype >= TX_MAX_TYPE) { 1462168404Spjd error = EINVAL; 1463168404Spjd } else { 1464168404Spjd /* 1465168404Spjd * On the first pass, arrange for the replay vector 1466168404Spjd * to fail its dmu_tx_assign(). That's the only way 1467168404Spjd * to ensure that those code paths remain well tested. 1468168404Spjd */ 1469168404Spjd *zr->zr_txgp = replay_txg - (pass == 1); 1470168404Spjd error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lrbuf, 1471168404Spjd zr->zr_byteswap); 1472168404Spjd *zr->zr_txgp = TXG_NOWAIT; 1473168404Spjd } 1474168404Spjd 1475168404Spjd if (error == 0) { 1476168404Spjd dsl_dataset_dirty(dmu_objset_ds(zr->zr_os), replay_tx); 1477168404Spjd zilog->zl_replay_seq[replay_txg & TXG_MASK] = 1478168404Spjd lr->lrc_seq; 1479168404Spjd } 1480168404Spjd 1481168404Spjd dmu_tx_commit(replay_tx); 1482168404Spjd 1483168404Spjd if (!error) 1484168404Spjd return; 1485168404Spjd 1486168404Spjd /* 1487168404Spjd * The DMU's dnode layer doesn't see removes until the txg 1488168404Spjd * commits, so a subsequent claim can spuriously fail with 1489168404Spjd * EEXIST. So if we receive any error other than ERESTART 1490168404Spjd * we try syncing out any removes then retrying the 1491168404Spjd * transaction. 1492168404Spjd */ 1493168404Spjd if (error != ERESTART && !sunk) { 1494168404Spjd txg_wait_synced(spa_get_dsl(zilog->zl_spa), 0); 1495168404Spjd sunk = B_TRUE; 1496168404Spjd continue; /* retry */ 1497168404Spjd } 1498168404Spjd 1499168404Spjd if (error != ERESTART) 1500168404Spjd break; 1501168404Spjd 1502168404Spjd if (pass != 1) 1503168404Spjd txg_wait_open(spa_get_dsl(zilog->zl_spa), 1504168404Spjd replay_txg + 1); 1505168404Spjd 1506168404Spjd dprintf("pass %d, retrying\n", pass); 1507168404Spjd } 1508168404Spjd 1509168404Spjd ASSERT(error && error != ERESTART); 1510168404Spjd name = kmem_alloc(MAXNAMELEN, KM_SLEEP); 1511168404Spjd dmu_objset_name(zr->zr_os, name); 1512168404Spjd cmn_err(CE_WARN, "ZFS replay transaction error %d, " 1513168404Spjd "dataset %s, seq 0x%llx, txtype %llu\n", 1514168404Spjd error, name, (u_longlong_t)lr->lrc_seq, (u_longlong_t)txtype); 1515168404Spjd zilog->zl_stop_replay = 1; 1516168404Spjd kmem_free(name, MAXNAMELEN); 1517168404Spjd} 1518168404Spjd 1519168404Spjd/* ARGSUSED */ 1520168404Spjdstatic void 1521168404Spjdzil_incr_blks(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) 1522168404Spjd{ 1523168404Spjd zilog->zl_replay_blks++; 1524168404Spjd} 1525168404Spjd 1526168404Spjd/* 1527168404Spjd * If this dataset has a non-empty intent log, replay it and destroy it. 1528168404Spjd */ 1529168404Spjdvoid 1530168404Spjdzil_replay(objset_t *os, void *arg, uint64_t *txgp, 1531168404Spjd zil_replay_func_t *replay_func[TX_MAX_TYPE]) 1532168404Spjd{ 1533168404Spjd zilog_t *zilog = dmu_objset_zil(os); 1534168404Spjd const zil_header_t *zh = zilog->zl_header; 1535168404Spjd zil_replay_arg_t zr; 1536168404Spjd 1537168404Spjd if (zil_empty(zilog)) { 1538168404Spjd zil_destroy(zilog, B_TRUE); 1539168404Spjd return; 1540168404Spjd } 1541168404Spjd //printf("ZFS: Replaying ZIL on %s...\n", os->os->os_spa->spa_name); 1542168404Spjd 1543168404Spjd zr.zr_os = os; 1544168404Spjd zr.zr_replay = replay_func; 1545168404Spjd zr.zr_arg = arg; 1546168404Spjd zr.zr_txgp = txgp; 1547168404Spjd zr.zr_byteswap = BP_SHOULD_BYTESWAP(&zh->zh_log); 1548168404Spjd zr.zr_lrbuf = kmem_alloc(2 * SPA_MAXBLOCKSIZE, KM_SLEEP); 1549168404Spjd 1550168404Spjd /* 1551168404Spjd * Wait for in-progress removes to sync before starting replay. 1552168404Spjd */ 1553168404Spjd txg_wait_synced(zilog->zl_dmu_pool, 0); 1554168404Spjd 1555168404Spjd zilog->zl_stop_replay = 0; 1556168404Spjd zilog->zl_replay_time = lbolt; 1557168404Spjd ASSERT(zilog->zl_replay_blks == 0); 1558168404Spjd (void) zil_parse(zilog, zil_incr_blks, zil_replay_log_record, &zr, 1559168404Spjd zh->zh_claim_txg); 1560168404Spjd kmem_free(zr.zr_lrbuf, 2 * SPA_MAXBLOCKSIZE); 1561168404Spjd 1562168404Spjd zil_destroy(zilog, B_FALSE); 1563168404Spjd //printf("ZFS: Replay of ZIL on %s finished.\n", os->os->os_spa->spa_name); 1564168404Spjd} 1565168404Spjd 1566168404Spjd/* 1567168404Spjd * Report whether all transactions are committed 1568168404Spjd */ 1569168404Spjdint 1570168404Spjdzil_is_committed(zilog_t *zilog) 1571168404Spjd{ 1572168404Spjd lwb_t *lwb; 1573168404Spjd int ret; 1574168404Spjd 1575168404Spjd mutex_enter(&zilog->zl_lock); 1576168404Spjd while (zilog->zl_writer) 1577168404Spjd cv_wait(&zilog->zl_cv_writer, &zilog->zl_lock); 1578168404Spjd 1579168404Spjd /* recent unpushed intent log transactions? */ 1580168404Spjd if (!list_is_empty(&zilog->zl_itx_list)) { 1581168404Spjd ret = B_FALSE; 1582168404Spjd goto out; 1583168404Spjd } 1584168404Spjd 1585168404Spjd /* intent log never used? */ 1586168404Spjd lwb = list_head(&zilog->zl_lwb_list); 1587168404Spjd if (lwb == NULL) { 1588168404Spjd ret = B_TRUE; 1589168404Spjd goto out; 1590168404Spjd } 1591168404Spjd 1592168404Spjd /* 1593168404Spjd * more than 1 log buffer means zil_sync() hasn't yet freed 1594168404Spjd * entries after a txg has committed 1595168404Spjd */ 1596168404Spjd if (list_next(&zilog->zl_lwb_list, lwb)) { 1597168404Spjd ret = B_FALSE; 1598168404Spjd goto out; 1599168404Spjd } 1600168404Spjd 1601168404Spjd ASSERT(zil_empty(zilog)); 1602168404Spjd ret = B_TRUE; 1603168404Spjdout: 1604168404Spjd cv_broadcast(&zilog->zl_cv_writer); 1605168404Spjd mutex_exit(&zilog->zl_lock); 1606168404Spjd return (ret); 1607168404Spjd} 1608