1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5fe9cf88cSperrin * Common Development and Distribution License (the "License"). 6fe9cf88cSperrin * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 2255da60b9SMark J Musante * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 237802d7bfSMatthew Ahrens * Copyright (c) 2011, 2014 by Delphix. All rights reserved. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 2655da60b9SMark J Musante /* Portions Copyright 2010 Robert Milkowski */ 2755da60b9SMark J Musante 28fa9e4066Sahrens #include <sys/zfs_context.h> 29fa9e4066Sahrens #include <sys/spa.h> 30fa9e4066Sahrens #include <sys/dmu.h> 31fa9e4066Sahrens #include <sys/zap.h> 32fa9e4066Sahrens #include <sys/arc.h> 33fa9e4066Sahrens #include <sys/stat.h> 34fa9e4066Sahrens #include <sys/resource.h> 35fa9e4066Sahrens #include <sys/zil.h> 36fa9e4066Sahrens #include <sys/zil_impl.h> 37fa9e4066Sahrens #include <sys/dsl_dataset.h> 384b964adaSGeorge Wilson #include <sys/vdev_impl.h> 39d63d470bSgw #include <sys/dmu_tx.h> 403f9d6ad7SLin Ling #include <sys/dsl_pool.h> 41fa9e4066Sahrens 42fa9e4066Sahrens /* 43fa9e4066Sahrens * The zfs intent log (ZIL) saves transaction records of system calls 44fa9e4066Sahrens * that change the file system in memory with enough information 45fa9e4066Sahrens * to be able to replay them. These are stored in memory until 46fa9e4066Sahrens * either the DMU transaction group (txg) commits them to the stable pool 47fa9e4066Sahrens * and they can be discarded, or they are flushed to the stable log 48fa9e4066Sahrens * (also in the pool) due to a fsync, O_DSYNC or other synchronous 49fa9e4066Sahrens * requirement. In the event of a panic or power fail then those log 50fa9e4066Sahrens * records (transactions) are replayed. 51fa9e4066Sahrens * 52fa9e4066Sahrens * There is one ZIL per file system. Its on-disk (pool) format consists 53fa9e4066Sahrens * of 3 parts: 54fa9e4066Sahrens * 55fa9e4066Sahrens * - ZIL header 56fa9e4066Sahrens * - ZIL blocks 57fa9e4066Sahrens * - ZIL records 58fa9e4066Sahrens * 59fa9e4066Sahrens * A log record holds a system call transaction. Log blocks can 60fa9e4066Sahrens * hold many log records and the blocks are chained together. 61fa9e4066Sahrens * Each ZIL block contains a block pointer (blkptr_t) to the next 62fa9e4066Sahrens * ZIL block in the chain. The ZIL header points to the first 63fa9e4066Sahrens * block in the chain. Note there is not a fixed place in the pool 64fa9e4066Sahrens * to hold blocks. They are dynamically allocated and freed as 65fa9e4066Sahrens * needed from the blocks available. Figure X shows the ZIL structure: 66fa9e4066Sahrens */ 67fa9e4066Sahrens 68fa9e4066Sahrens /* 69f7170741SWill Andrews * Disable intent logging replay. This global ZIL switch affects all pools. 70fa9e4066Sahrens */ 71f7170741SWill Andrews int zil_replay_disable = 0; 72416e0cd8Sek 73416e0cd8Sek /* 74416e0cd8Sek * Tunable parameter for debugging or performance analysis. Setting 75416e0cd8Sek * zfs_nocacheflush will cause corruption on power loss if a volatile 76416e0cd8Sek * out-of-order write cache is enabled. 77416e0cd8Sek */ 78416e0cd8Sek boolean_t zfs_nocacheflush = B_FALSE; 79fa9e4066Sahrens 80fa9e4066Sahrens static kmem_cache_t *zil_lwb_cache; 81fa9e4066Sahrens 8291de656bSNeil Perrin static void zil_async_to_sync(zilog_t *zilog, uint64_t foid); 838f18d1faSGeorge Wilson 846e1f5caaSNeil Perrin #define LWB_EMPTY(lwb) ((BP_GET_LSIZE(&lwb->lwb_blk) - \ 856e1f5caaSNeil Perrin sizeof (zil_chain_t)) == (lwb->lwb_sz - lwb->lwb_nused)) 866e1f5caaSNeil Perrin 876e1f5caaSNeil Perrin 885002558fSNeil Perrin /* 895002558fSNeil Perrin * ziltest is by and large an ugly hack, but very useful in 905002558fSNeil Perrin * checking replay without tedious work. 915002558fSNeil Perrin * When running ziltest we want to keep all itx's and so maintain 925002558fSNeil Perrin * a single list in the zl_itxg[] that uses a high txg: ZILTEST_TXG 935002558fSNeil Perrin * We subtract TXG_CONCURRENT_STATES to allow for common code. 945002558fSNeil Perrin */ 955002558fSNeil Perrin #define ZILTEST_TXG (UINT64_MAX - TXG_CONCURRENT_STATES) 965002558fSNeil Perrin 97fa9e4066Sahrens static int 98b24ab676SJeff Bonwick zil_bp_compare(const void *x1, const void *x2) 99fa9e4066Sahrens { 100b24ab676SJeff Bonwick const dva_t *dva1 = &((zil_bp_node_t *)x1)->zn_dva; 101b24ab676SJeff Bonwick const dva_t *dva2 = &((zil_bp_node_t *)x2)->zn_dva; 102fa9e4066Sahrens 103fa9e4066Sahrens if (DVA_GET_VDEV(dva1) < DVA_GET_VDEV(dva2)) 104fa9e4066Sahrens return (-1); 105fa9e4066Sahrens if (DVA_GET_VDEV(dva1) > DVA_GET_VDEV(dva2)) 106fa9e4066Sahrens return (1); 107fa9e4066Sahrens 108fa9e4066Sahrens if (DVA_GET_OFFSET(dva1) < DVA_GET_OFFSET(dva2)) 109fa9e4066Sahrens return (-1); 110fa9e4066Sahrens if (DVA_GET_OFFSET(dva1) > DVA_GET_OFFSET(dva2)) 111fa9e4066Sahrens return (1); 112fa9e4066Sahrens 113fa9e4066Sahrens return (0); 114fa9e4066Sahrens } 115fa9e4066Sahrens 116fa9e4066Sahrens static void 117b24ab676SJeff Bonwick zil_bp_tree_init(zilog_t *zilog) 118fa9e4066Sahrens { 119b24ab676SJeff Bonwick avl_create(&zilog->zl_bp_tree, zil_bp_compare, 120b24ab676SJeff Bonwick sizeof (zil_bp_node_t), offsetof(zil_bp_node_t, zn_node)); 121fa9e4066Sahrens } 122fa9e4066Sahrens 123fa9e4066Sahrens static void 124b24ab676SJeff Bonwick zil_bp_tree_fini(zilog_t *zilog) 125fa9e4066Sahrens { 126b24ab676SJeff Bonwick avl_tree_t *t = &zilog->zl_bp_tree; 127b24ab676SJeff Bonwick zil_bp_node_t *zn; 128fa9e4066Sahrens void *cookie = NULL; 129fa9e4066Sahrens 130fa9e4066Sahrens while ((zn = avl_destroy_nodes(t, &cookie)) != NULL) 131b24ab676SJeff Bonwick kmem_free(zn, sizeof (zil_bp_node_t)); 132fa9e4066Sahrens 133fa9e4066Sahrens avl_destroy(t); 134fa9e4066Sahrens } 135fa9e4066Sahrens 136b24ab676SJeff Bonwick int 137b24ab676SJeff Bonwick zil_bp_tree_add(zilog_t *zilog, const blkptr_t *bp) 138fa9e4066Sahrens { 139b24ab676SJeff Bonwick avl_tree_t *t = &zilog->zl_bp_tree; 1405d7b4d43SMatthew Ahrens const dva_t *dva; 141b24ab676SJeff Bonwick zil_bp_node_t *zn; 142fa9e4066Sahrens avl_index_t where; 143fa9e4066Sahrens 1445d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 1455d7b4d43SMatthew Ahrens return (0); 1465d7b4d43SMatthew Ahrens 1475d7b4d43SMatthew Ahrens dva = BP_IDENTITY(bp); 1485d7b4d43SMatthew Ahrens 149fa9e4066Sahrens if (avl_find(t, dva, &where) != NULL) 150be6fd75aSMatthew Ahrens return (SET_ERROR(EEXIST)); 151fa9e4066Sahrens 152b24ab676SJeff Bonwick zn = kmem_alloc(sizeof (zil_bp_node_t), KM_SLEEP); 153fa9e4066Sahrens zn->zn_dva = *dva; 154fa9e4066Sahrens avl_insert(t, zn, where); 155fa9e4066Sahrens 156fa9e4066Sahrens return (0); 157fa9e4066Sahrens } 158fa9e4066Sahrens 159d80c45e0Sbonwick static zil_header_t * 160d80c45e0Sbonwick zil_header_in_syncing_context(zilog_t *zilog) 161d80c45e0Sbonwick { 162d80c45e0Sbonwick return ((zil_header_t *)zilog->zl_header); 163d80c45e0Sbonwick } 164d80c45e0Sbonwick 165d80c45e0Sbonwick static void 166d80c45e0Sbonwick zil_init_log_chain(zilog_t *zilog, blkptr_t *bp) 167d80c45e0Sbonwick { 168d80c45e0Sbonwick zio_cksum_t *zc = &bp->blk_cksum; 169d80c45e0Sbonwick 170d80c45e0Sbonwick zc->zc_word[ZIL_ZC_GUID_0] = spa_get_random(-1ULL); 171d80c45e0Sbonwick zc->zc_word[ZIL_ZC_GUID_1] = spa_get_random(-1ULL); 172d80c45e0Sbonwick zc->zc_word[ZIL_ZC_OBJSET] = dmu_objset_id(zilog->zl_os); 173d80c45e0Sbonwick zc->zc_word[ZIL_ZC_SEQ] = 1ULL; 174d80c45e0Sbonwick } 175d80c45e0Sbonwick 176fa9e4066Sahrens /* 177b24ab676SJeff Bonwick * Read a log block and make sure it's valid. 178fa9e4066Sahrens */ 179fa9e4066Sahrens static int 1806e1f5caaSNeil Perrin zil_read_log_block(zilog_t *zilog, const blkptr_t *bp, blkptr_t *nbp, void *dst, 1816e1f5caaSNeil Perrin char **end) 182fa9e4066Sahrens { 183b24ab676SJeff Bonwick enum zio_flag zio_flags = ZIO_FLAG_CANFAIL; 1847adb730bSGeorge Wilson arc_flags_t aflags = ARC_FLAG_WAIT; 185b24ab676SJeff Bonwick arc_buf_t *abuf = NULL; 1867802d7bfSMatthew Ahrens zbookmark_phys_t zb; 187fa9e4066Sahrens int error; 188fa9e4066Sahrens 189b24ab676SJeff Bonwick if (zilog->zl_header->zh_claim_txg == 0) 190b24ab676SJeff Bonwick zio_flags |= ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB; 191ea8dc4b6Seschrock 192b24ab676SJeff Bonwick if (!(zilog->zl_header->zh_flags & ZIL_CLAIM_LR_SEQ_VALID)) 193b24ab676SJeff Bonwick zio_flags |= ZIO_FLAG_SPECULATIVE; 194fa9e4066Sahrens 195b24ab676SJeff Bonwick SET_BOOKMARK(&zb, bp->blk_cksum.zc_word[ZIL_ZC_OBJSET], 196b24ab676SJeff Bonwick ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); 197b24ab676SJeff Bonwick 1981b912ec7SGeorge Wilson error = arc_read(NULL, zilog->zl_spa, bp, arc_getbuf_func, &abuf, 199b24ab676SJeff Bonwick ZIO_PRIORITY_SYNC_READ, zio_flags, &aflags, &zb); 200fa9e4066Sahrens 201d80c45e0Sbonwick if (error == 0) { 202d80c45e0Sbonwick zio_cksum_t cksum = bp->blk_cksum; 203fa9e4066Sahrens 204d80c45e0Sbonwick /* 205f5e6e722SNeil Perrin * Validate the checksummed log block. 206f5e6e722SNeil Perrin * 207d80c45e0Sbonwick * Sequence numbers should be... sequential. The checksum 208d80c45e0Sbonwick * verifier for the next block should be bp's checksum plus 1. 209f5e6e722SNeil Perrin * 210f5e6e722SNeil Perrin * Also check the log chain linkage and size used. 211d80c45e0Sbonwick */ 212d80c45e0Sbonwick cksum.zc_word[ZIL_ZC_SEQ]++; 213d80c45e0Sbonwick 2146e1f5caaSNeil Perrin if (BP_GET_CHECKSUM(bp) == ZIO_CHECKSUM_ZILOG2) { 2156e1f5caaSNeil Perrin zil_chain_t *zilc = abuf->b_data; 2166e1f5caaSNeil Perrin char *lr = (char *)(zilc + 1); 2176e1f5caaSNeil Perrin uint64_t len = zilc->zc_nused - sizeof (zil_chain_t); 2186e1f5caaSNeil Perrin 2196e1f5caaSNeil Perrin if (bcmp(&cksum, &zilc->zc_next_blk.blk_cksum, 2206e1f5caaSNeil Perrin sizeof (cksum)) || BP_IS_HOLE(&zilc->zc_next_blk)) { 221be6fd75aSMatthew Ahrens error = SET_ERROR(ECKSUM); 2226e1f5caaSNeil Perrin } else { 223b5152584SMatthew Ahrens ASSERT3U(len, <=, SPA_OLD_MAXBLOCKSIZE); 2246e1f5caaSNeil Perrin bcopy(lr, dst, len); 2256e1f5caaSNeil Perrin *end = (char *)dst + len; 2266e1f5caaSNeil Perrin *nbp = zilc->zc_next_blk; 2276e1f5caaSNeil Perrin } 2286e1f5caaSNeil Perrin } else { 2296e1f5caaSNeil Perrin char *lr = abuf->b_data; 2306e1f5caaSNeil Perrin uint64_t size = BP_GET_LSIZE(bp); 2316e1f5caaSNeil Perrin zil_chain_t *zilc = (zil_chain_t *)(lr + size) - 1; 2326e1f5caaSNeil Perrin 2336e1f5caaSNeil Perrin if (bcmp(&cksum, &zilc->zc_next_blk.blk_cksum, 2346e1f5caaSNeil Perrin sizeof (cksum)) || BP_IS_HOLE(&zilc->zc_next_blk) || 2356e1f5caaSNeil Perrin (zilc->zc_nused > (size - sizeof (*zilc)))) { 236be6fd75aSMatthew Ahrens error = SET_ERROR(ECKSUM); 2376e1f5caaSNeil Perrin } else { 238b5152584SMatthew Ahrens ASSERT3U(zilc->zc_nused, <=, 239b5152584SMatthew Ahrens SPA_OLD_MAXBLOCKSIZE); 2406e1f5caaSNeil Perrin bcopy(lr, dst, zilc->zc_nused); 2416e1f5caaSNeil Perrin *end = (char *)dst + zilc->zc_nused; 2426e1f5caaSNeil Perrin *nbp = zilc->zc_next_blk; 2436e1f5caaSNeil Perrin } 2446e1f5caaSNeil Perrin } 245fa9e4066Sahrens 2463b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(abuf, &abuf)); 247fa9e4066Sahrens } 248fa9e4066Sahrens 249b24ab676SJeff Bonwick return (error); 250b24ab676SJeff Bonwick } 251b24ab676SJeff Bonwick 252b24ab676SJeff Bonwick /* 253b24ab676SJeff Bonwick * Read a TX_WRITE log data block. 254b24ab676SJeff Bonwick */ 255b24ab676SJeff Bonwick static int 256b24ab676SJeff Bonwick zil_read_log_data(zilog_t *zilog, const lr_write_t *lr, void *wbuf) 257b24ab676SJeff Bonwick { 258b24ab676SJeff Bonwick enum zio_flag zio_flags = ZIO_FLAG_CANFAIL; 259b24ab676SJeff Bonwick const blkptr_t *bp = &lr->lr_blkptr; 2607adb730bSGeorge Wilson arc_flags_t aflags = ARC_FLAG_WAIT; 261b24ab676SJeff Bonwick arc_buf_t *abuf = NULL; 2627802d7bfSMatthew Ahrens zbookmark_phys_t zb; 263b24ab676SJeff Bonwick int error; 264b24ab676SJeff Bonwick 265b24ab676SJeff Bonwick if (BP_IS_HOLE(bp)) { 266b24ab676SJeff Bonwick if (wbuf != NULL) 267b24ab676SJeff Bonwick bzero(wbuf, MAX(BP_GET_LSIZE(bp), lr->lr_length)); 268b24ab676SJeff Bonwick return (0); 269b24ab676SJeff Bonwick } 270b24ab676SJeff Bonwick 271b24ab676SJeff Bonwick if (zilog->zl_header->zh_claim_txg == 0) 272b24ab676SJeff Bonwick zio_flags |= ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB; 273b24ab676SJeff Bonwick 274b24ab676SJeff Bonwick SET_BOOKMARK(&zb, dmu_objset_id(zilog->zl_os), lr->lr_foid, 275b24ab676SJeff Bonwick ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp)); 276b24ab676SJeff Bonwick 2771b912ec7SGeorge Wilson error = arc_read(NULL, zilog->zl_spa, bp, arc_getbuf_func, &abuf, 278b24ab676SJeff Bonwick ZIO_PRIORITY_SYNC_READ, zio_flags, &aflags, &zb); 279b24ab676SJeff Bonwick 280b24ab676SJeff Bonwick if (error == 0) { 281b24ab676SJeff Bonwick if (wbuf != NULL) 282b24ab676SJeff Bonwick bcopy(abuf->b_data, wbuf, arc_buf_size(abuf)); 283b24ab676SJeff Bonwick (void) arc_buf_remove_ref(abuf, &abuf); 284b24ab676SJeff Bonwick } 285fa9e4066Sahrens 286d80c45e0Sbonwick return (error); 287fa9e4066Sahrens } 288fa9e4066Sahrens 289fa9e4066Sahrens /* 290fa9e4066Sahrens * Parse the intent log, and call parse_func for each valid record within. 291fa9e4066Sahrens */ 292b24ab676SJeff Bonwick int 293fa9e4066Sahrens zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func, 294fa9e4066Sahrens zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg) 295fa9e4066Sahrens { 296d80c45e0Sbonwick const zil_header_t *zh = zilog->zl_header; 297b24ab676SJeff Bonwick boolean_t claimed = !!zh->zh_claim_txg; 298b24ab676SJeff Bonwick uint64_t claim_blk_seq = claimed ? zh->zh_claim_blk_seq : UINT64_MAX; 299b24ab676SJeff Bonwick uint64_t claim_lr_seq = claimed ? zh->zh_claim_lr_seq : UINT64_MAX; 300b24ab676SJeff Bonwick uint64_t max_blk_seq = 0; 301b24ab676SJeff Bonwick uint64_t max_lr_seq = 0; 302b24ab676SJeff Bonwick uint64_t blk_count = 0; 303b24ab676SJeff Bonwick uint64_t lr_count = 0; 304b24ab676SJeff Bonwick blkptr_t blk, next_blk; 305fa9e4066Sahrens char *lrbuf, *lrp; 306b24ab676SJeff Bonwick int error = 0; 307fa9e4066Sahrens 308b24ab676SJeff Bonwick /* 309b24ab676SJeff Bonwick * Old logs didn't record the maximum zh_claim_lr_seq. 310b24ab676SJeff Bonwick */ 311b24ab676SJeff Bonwick if (!(zh->zh_flags & ZIL_CLAIM_LR_SEQ_VALID)) 312b24ab676SJeff Bonwick claim_lr_seq = UINT64_MAX; 313fa9e4066Sahrens 314fa9e4066Sahrens /* 315fa9e4066Sahrens * Starting at the block pointed to by zh_log we read the log chain. 316fa9e4066Sahrens * For each block in the chain we strongly check that block to 317fa9e4066Sahrens * ensure its validity. We stop when an invalid block is found. 318fa9e4066Sahrens * For each block pointer in the chain we call parse_blk_func(). 319fa9e4066Sahrens * For each record in each valid block we call parse_lr_func(). 320d80c45e0Sbonwick * If the log has been claimed, stop if we encounter a sequence 321d80c45e0Sbonwick * number greater than the highest claimed sequence number. 322fa9e4066Sahrens */ 323b5152584SMatthew Ahrens lrbuf = zio_buf_alloc(SPA_OLD_MAXBLOCKSIZE); 324b24ab676SJeff Bonwick zil_bp_tree_init(zilog); 325d80c45e0Sbonwick 326b24ab676SJeff Bonwick for (blk = zh->zh_log; !BP_IS_HOLE(&blk); blk = next_blk) { 327b24ab676SJeff Bonwick uint64_t blk_seq = blk.blk_cksum.zc_word[ZIL_ZC_SEQ]; 328b24ab676SJeff Bonwick int reclen; 3296e1f5caaSNeil Perrin char *end; 330d80c45e0Sbonwick 331b24ab676SJeff Bonwick if (blk_seq > claim_blk_seq) 332b24ab676SJeff Bonwick break; 333b24ab676SJeff Bonwick if ((error = parse_blk_func(zilog, &blk, arg, txg)) != 0) 334b24ab676SJeff Bonwick break; 3356e1f5caaSNeil Perrin ASSERT3U(max_blk_seq, <, blk_seq); 336b24ab676SJeff Bonwick max_blk_seq = blk_seq; 337b24ab676SJeff Bonwick blk_count++; 338fa9e4066Sahrens 339b24ab676SJeff Bonwick if (max_lr_seq == claim_lr_seq && max_blk_seq == claim_blk_seq) 340b24ab676SJeff Bonwick break; 341fa9e4066Sahrens 3426e1f5caaSNeil Perrin error = zil_read_log_block(zilog, &blk, &next_blk, lrbuf, &end); 3433b2aab18SMatthew Ahrens if (error != 0) 344fa9e4066Sahrens break; 345fa9e4066Sahrens 3466e1f5caaSNeil Perrin for (lrp = lrbuf; lrp < end; lrp += reclen) { 347fa9e4066Sahrens lr_t *lr = (lr_t *)lrp; 348fa9e4066Sahrens reclen = lr->lrc_reclen; 349fa9e4066Sahrens ASSERT3U(reclen, >=, sizeof (lr_t)); 350b24ab676SJeff Bonwick if (lr->lrc_seq > claim_lr_seq) 351b24ab676SJeff Bonwick goto done; 352b24ab676SJeff Bonwick if ((error = parse_lr_func(zilog, lr, arg, txg)) != 0) 353b24ab676SJeff Bonwick goto done; 3546e1f5caaSNeil Perrin ASSERT3U(max_lr_seq, <, lr->lrc_seq); 355b24ab676SJeff Bonwick max_lr_seq = lr->lrc_seq; 356b24ab676SJeff Bonwick lr_count++; 357fa9e4066Sahrens } 358fa9e4066Sahrens } 359b24ab676SJeff Bonwick done: 360b24ab676SJeff Bonwick zilog->zl_parse_error = error; 361b24ab676SJeff Bonwick zilog->zl_parse_blk_seq = max_blk_seq; 362b24ab676SJeff Bonwick zilog->zl_parse_lr_seq = max_lr_seq; 363b24ab676SJeff Bonwick zilog->zl_parse_blk_count = blk_count; 364b24ab676SJeff Bonwick zilog->zl_parse_lr_count = lr_count; 365b24ab676SJeff Bonwick 366b24ab676SJeff Bonwick ASSERT(!claimed || !(zh->zh_flags & ZIL_CLAIM_LR_SEQ_VALID) || 367b24ab676SJeff Bonwick (max_blk_seq == claim_blk_seq && max_lr_seq == claim_lr_seq)); 368d80c45e0Sbonwick 369b24ab676SJeff Bonwick zil_bp_tree_fini(zilog); 370b5152584SMatthew Ahrens zio_buf_free(lrbuf, SPA_OLD_MAXBLOCKSIZE); 371b24ab676SJeff Bonwick 372b24ab676SJeff Bonwick return (error); 373fa9e4066Sahrens } 374fa9e4066Sahrens 375b24ab676SJeff Bonwick static int 376fa9e4066Sahrens zil_claim_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t first_txg) 377fa9e4066Sahrens { 378fa9e4066Sahrens /* 379fa9e4066Sahrens * Claim log block if not already committed and not already claimed. 380b24ab676SJeff Bonwick * If tx == NULL, just verify that the block is claimable. 381fa9e4066Sahrens */ 38243466aaeSMax Grossman if (BP_IS_HOLE(bp) || bp->blk_birth < first_txg || 38343466aaeSMax Grossman zil_bp_tree_add(zilog, bp) != 0) 384b24ab676SJeff Bonwick return (0); 385b24ab676SJeff Bonwick 386b24ab676SJeff Bonwick return (zio_wait(zio_claim(NULL, zilog->zl_spa, 387b24ab676SJeff Bonwick tx == NULL ? 0 : first_txg, bp, spa_claim_notify, NULL, 388b24ab676SJeff Bonwick ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB))); 389fa9e4066Sahrens } 390fa9e4066Sahrens 391b24ab676SJeff Bonwick static int 392fa9e4066Sahrens zil_claim_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t first_txg) 393fa9e4066Sahrens { 394b24ab676SJeff Bonwick lr_write_t *lr = (lr_write_t *)lrc; 395b24ab676SJeff Bonwick int error; 396b24ab676SJeff Bonwick 397b24ab676SJeff Bonwick if (lrc->lrc_txtype != TX_WRITE) 398b24ab676SJeff Bonwick return (0); 399b24ab676SJeff Bonwick 400b24ab676SJeff Bonwick /* 401b24ab676SJeff Bonwick * If the block is not readable, don't claim it. This can happen 402b24ab676SJeff Bonwick * in normal operation when a log block is written to disk before 403b24ab676SJeff Bonwick * some of the dmu_sync() blocks it points to. In this case, the 404b24ab676SJeff Bonwick * transaction cannot have been committed to anyone (we would have 405b24ab676SJeff Bonwick * waited for all writes to be stable first), so it is semantically 406b24ab676SJeff Bonwick * correct to declare this the end of the log. 407b24ab676SJeff Bonwick */ 408b24ab676SJeff Bonwick if (lr->lr_blkptr.blk_birth >= first_txg && 409b24ab676SJeff Bonwick (error = zil_read_log_data(zilog, lr, NULL)) != 0) 410b24ab676SJeff Bonwick return (error); 411b24ab676SJeff Bonwick return (zil_claim_log_block(zilog, &lr->lr_blkptr, tx, first_txg)); 412fa9e4066Sahrens } 413fa9e4066Sahrens 414fa9e4066Sahrens /* ARGSUSED */ 415b24ab676SJeff Bonwick static int 416fa9e4066Sahrens zil_free_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t claim_txg) 417fa9e4066Sahrens { 418b24ab676SJeff Bonwick zio_free_zil(zilog->zl_spa, dmu_tx_get_txg(tx), bp); 419b24ab676SJeff Bonwick 420b24ab676SJeff Bonwick return (0); 421fa9e4066Sahrens } 422fa9e4066Sahrens 423b24ab676SJeff Bonwick static int 424fa9e4066Sahrens zil_free_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t claim_txg) 425fa9e4066Sahrens { 426b24ab676SJeff Bonwick lr_write_t *lr = (lr_write_t *)lrc; 427b24ab676SJeff Bonwick blkptr_t *bp = &lr->lr_blkptr; 428b24ab676SJeff Bonwick 429fa9e4066Sahrens /* 430fa9e4066Sahrens * If we previously claimed it, we need to free it. 431fa9e4066Sahrens */ 432b24ab676SJeff Bonwick if (claim_txg != 0 && lrc->lrc_txtype == TX_WRITE && 43343466aaeSMax Grossman bp->blk_birth >= claim_txg && zil_bp_tree_add(zilog, bp) == 0 && 43443466aaeSMax Grossman !BP_IS_HOLE(bp)) 435b24ab676SJeff Bonwick zio_free(zilog->zl_spa, dmu_tx_get_txg(tx), bp); 436b24ab676SJeff Bonwick 437b24ab676SJeff Bonwick return (0); 438fa9e4066Sahrens } 439fa9e4066Sahrens 4406e1f5caaSNeil Perrin static lwb_t * 4416e1f5caaSNeil Perrin zil_alloc_lwb(zilog_t *zilog, blkptr_t *bp, uint64_t txg) 4426e1f5caaSNeil Perrin { 4436e1f5caaSNeil Perrin lwb_t *lwb; 4446e1f5caaSNeil Perrin 4456e1f5caaSNeil Perrin lwb = kmem_cache_alloc(zil_lwb_cache, KM_SLEEP); 4466e1f5caaSNeil Perrin lwb->lwb_zilog = zilog; 4476e1f5caaSNeil Perrin lwb->lwb_blk = *bp; 4486e1f5caaSNeil Perrin lwb->lwb_buf = zio_buf_alloc(BP_GET_LSIZE(bp)); 4496e1f5caaSNeil Perrin lwb->lwb_max_txg = txg; 4506e1f5caaSNeil Perrin lwb->lwb_zio = NULL; 4516e1f5caaSNeil Perrin lwb->lwb_tx = NULL; 4526e1f5caaSNeil Perrin if (BP_GET_CHECKSUM(bp) == ZIO_CHECKSUM_ZILOG2) { 4536e1f5caaSNeil Perrin lwb->lwb_nused = sizeof (zil_chain_t); 4546e1f5caaSNeil Perrin lwb->lwb_sz = BP_GET_LSIZE(bp); 4556e1f5caaSNeil Perrin } else { 4566e1f5caaSNeil Perrin lwb->lwb_nused = 0; 4576e1f5caaSNeil Perrin lwb->lwb_sz = BP_GET_LSIZE(bp) - sizeof (zil_chain_t); 4586e1f5caaSNeil Perrin } 4596e1f5caaSNeil Perrin 4606e1f5caaSNeil Perrin mutex_enter(&zilog->zl_lock); 4616e1f5caaSNeil Perrin list_insert_tail(&zilog->zl_lwb_list, lwb); 4626e1f5caaSNeil Perrin mutex_exit(&zilog->zl_lock); 4636e1f5caaSNeil Perrin 4646e1f5caaSNeil Perrin return (lwb); 4656e1f5caaSNeil Perrin } 4666e1f5caaSNeil Perrin 467ce636f8bSMatthew Ahrens /* 468ce636f8bSMatthew Ahrens * Called when we create in-memory log transactions so that we know 469ce636f8bSMatthew Ahrens * to cleanup the itxs at the end of spa_sync(). 470ce636f8bSMatthew Ahrens */ 471ce636f8bSMatthew Ahrens void 472ce636f8bSMatthew Ahrens zilog_dirty(zilog_t *zilog, uint64_t txg) 473ce636f8bSMatthew Ahrens { 474ce636f8bSMatthew Ahrens dsl_pool_t *dp = zilog->zl_dmu_pool; 475ce636f8bSMatthew Ahrens dsl_dataset_t *ds = dmu_objset_ds(zilog->zl_os); 476ce636f8bSMatthew Ahrens 477bc9014e6SJustin Gibbs if (ds->ds_is_snapshot) 478ce636f8bSMatthew Ahrens panic("dirtying snapshot!"); 479ce636f8bSMatthew Ahrens 4803b2aab18SMatthew Ahrens if (txg_list_add(&dp->dp_dirty_zilogs, zilog, txg)) { 481ce636f8bSMatthew Ahrens /* up the hold count until we can be written out */ 482ce636f8bSMatthew Ahrens dmu_buf_add_ref(ds->ds_dbuf, zilog); 483ce636f8bSMatthew Ahrens } 484ce636f8bSMatthew Ahrens } 485ce636f8bSMatthew Ahrens 486ce636f8bSMatthew Ahrens boolean_t 487ce636f8bSMatthew Ahrens zilog_is_dirty(zilog_t *zilog) 488ce636f8bSMatthew Ahrens { 489ce636f8bSMatthew Ahrens dsl_pool_t *dp = zilog->zl_dmu_pool; 490ce636f8bSMatthew Ahrens 491ce636f8bSMatthew Ahrens for (int t = 0; t < TXG_SIZE; t++) { 492ce636f8bSMatthew Ahrens if (txg_list_member(&dp->dp_dirty_zilogs, zilog, t)) 493ce636f8bSMatthew Ahrens return (B_TRUE); 494ce636f8bSMatthew Ahrens } 495ce636f8bSMatthew Ahrens return (B_FALSE); 496ce636f8bSMatthew Ahrens } 497ce636f8bSMatthew Ahrens 498fa9e4066Sahrens /* 499fa9e4066Sahrens * Create an on-disk intent log. 500fa9e4066Sahrens */ 5016e1f5caaSNeil Perrin static lwb_t * 502fa9e4066Sahrens zil_create(zilog_t *zilog) 503fa9e4066Sahrens { 504d80c45e0Sbonwick const zil_header_t *zh = zilog->zl_header; 5056e1f5caaSNeil Perrin lwb_t *lwb = NULL; 506d80c45e0Sbonwick uint64_t txg = 0; 507d80c45e0Sbonwick dmu_tx_t *tx = NULL; 508fa9e4066Sahrens blkptr_t blk; 509d80c45e0Sbonwick int error = 0; 510fa9e4066Sahrens 511fa9e4066Sahrens /* 512d80c45e0Sbonwick * Wait for any previous destroy to complete. 513fa9e4066Sahrens */ 514d80c45e0Sbonwick txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); 515d80c45e0Sbonwick 516d80c45e0Sbonwick ASSERT(zh->zh_claim_txg == 0); 517d80c45e0Sbonwick ASSERT(zh->zh_replay_seq == 0); 518d80c45e0Sbonwick 519d80c45e0Sbonwick blk = zh->zh_log; 520fa9e4066Sahrens 521fa9e4066Sahrens /* 5226e1f5caaSNeil Perrin * Allocate an initial log block if: 5236e1f5caaSNeil Perrin * - there isn't one already 5246e1f5caaSNeil Perrin * - the existing block is the wrong endianess 525fa9e4066Sahrens */ 526899217ddSNeil Perrin if (BP_IS_HOLE(&blk) || BP_SHOULD_BYTESWAP(&blk)) { 527d80c45e0Sbonwick tx = dmu_tx_create(zilog->zl_os); 528b24ab676SJeff Bonwick VERIFY(dmu_tx_assign(tx, TXG_WAIT) == 0); 529d80c45e0Sbonwick dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 530d80c45e0Sbonwick txg = dmu_tx_get_txg(tx); 531d80c45e0Sbonwick 532899217ddSNeil Perrin if (!BP_IS_HOLE(&blk)) { 533b24ab676SJeff Bonwick zio_free_zil(zilog->zl_spa, txg, &blk); 534899217ddSNeil Perrin BP_ZERO(&blk); 535899217ddSNeil Perrin } 536899217ddSNeil Perrin 537b24ab676SJeff Bonwick error = zio_alloc_zil(zilog->zl_spa, txg, &blk, NULL, 538b24ab676SJeff Bonwick ZIL_MIN_BLKSZ, zilog->zl_logbias == ZFS_LOGBIAS_LATENCY); 539d80c45e0Sbonwick 540d80c45e0Sbonwick if (error == 0) 541d80c45e0Sbonwick zil_init_log_chain(zilog, &blk); 54213f5297eSperrin } 543fa9e4066Sahrens 544d80c45e0Sbonwick /* 545d80c45e0Sbonwick * Allocate a log write buffer (lwb) for the first log block. 546d80c45e0Sbonwick */ 5476e1f5caaSNeil Perrin if (error == 0) 5486e1f5caaSNeil Perrin lwb = zil_alloc_lwb(zilog, &blk, txg); 549fa9e4066Sahrens 550d80c45e0Sbonwick /* 551d80c45e0Sbonwick * If we just allocated the first log block, commit our transaction 552d80c45e0Sbonwick * and wait for zil_sync() to stuff the block poiner into zh_log. 553d80c45e0Sbonwick * (zh is part of the MOS, so we cannot modify it in open context.) 554d80c45e0Sbonwick */ 555d80c45e0Sbonwick if (tx != NULL) { 556d80c45e0Sbonwick dmu_tx_commit(tx); 55713f5297eSperrin txg_wait_synced(zilog->zl_dmu_pool, txg); 558d80c45e0Sbonwick } 559d80c45e0Sbonwick 560d80c45e0Sbonwick ASSERT(bcmp(&blk, &zh->zh_log, sizeof (blk)) == 0); 5616e1f5caaSNeil Perrin 5626e1f5caaSNeil Perrin return (lwb); 563fa9e4066Sahrens } 564fa9e4066Sahrens 565fa9e4066Sahrens /* 566fa9e4066Sahrens * In one tx, free all log blocks and clear the log header. 567d80c45e0Sbonwick * If keep_first is set, then we're replaying a log with no content. 568d80c45e0Sbonwick * We want to keep the first block, however, so that the first 569d80c45e0Sbonwick * synchronous transaction doesn't require a txg_wait_synced() 570d80c45e0Sbonwick * in zil_create(). We don't need to txg_wait_synced() here either 571d80c45e0Sbonwick * when keep_first is set, because both zil_create() and zil_destroy() 572d80c45e0Sbonwick * will wait for any in-progress destroys to complete. 573fa9e4066Sahrens */ 574fa9e4066Sahrens void 575d80c45e0Sbonwick zil_destroy(zilog_t *zilog, boolean_t keep_first) 576fa9e4066Sahrens { 577d80c45e0Sbonwick const zil_header_t *zh = zilog->zl_header; 578d80c45e0Sbonwick lwb_t *lwb; 579fa9e4066Sahrens dmu_tx_t *tx; 580fa9e4066Sahrens uint64_t txg; 581fa9e4066Sahrens 582d80c45e0Sbonwick /* 583d80c45e0Sbonwick * Wait for any previous destroy to complete. 584d80c45e0Sbonwick */ 585d80c45e0Sbonwick txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); 586fa9e4066Sahrens 587b24ab676SJeff Bonwick zilog->zl_old_header = *zh; /* debugging aid */ 588b24ab676SJeff Bonwick 589d80c45e0Sbonwick if (BP_IS_HOLE(&zh->zh_log)) 590fa9e4066Sahrens return; 591fa9e4066Sahrens 592fa9e4066Sahrens tx = dmu_tx_create(zilog->zl_os); 593b24ab676SJeff Bonwick VERIFY(dmu_tx_assign(tx, TXG_WAIT) == 0); 594fa9e4066Sahrens dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 595fa9e4066Sahrens txg = dmu_tx_get_txg(tx); 596fa9e4066Sahrens 597d80c45e0Sbonwick mutex_enter(&zilog->zl_lock); 598d80c45e0Sbonwick 599d80c45e0Sbonwick ASSERT3U(zilog->zl_destroy_txg, <, txg); 600fa9e4066Sahrens zilog->zl_destroy_txg = txg; 601b24ab676SJeff Bonwick zilog->zl_keep_first = keep_first; 602d80c45e0Sbonwick 603d80c45e0Sbonwick if (!list_is_empty(&zilog->zl_lwb_list)) { 604d80c45e0Sbonwick ASSERT(zh->zh_claim_txg == 0); 605c9ba2a43SEric Schrock VERIFY(!keep_first); 606d80c45e0Sbonwick while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) { 607d80c45e0Sbonwick list_remove(&zilog->zl_lwb_list, lwb); 608d80c45e0Sbonwick if (lwb->lwb_buf != NULL) 609d80c45e0Sbonwick zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); 610b24ab676SJeff Bonwick zio_free_zil(zilog->zl_spa, txg, &lwb->lwb_blk); 611d80c45e0Sbonwick kmem_cache_free(zil_lwb_cache, lwb); 612d80c45e0Sbonwick } 613b24ab676SJeff Bonwick } else if (!keep_first) { 614ce636f8bSMatthew Ahrens zil_destroy_sync(zilog, tx); 615d80c45e0Sbonwick } 616b19a79ecSperrin mutex_exit(&zilog->zl_lock); 617fa9e4066Sahrens 618fa9e4066Sahrens dmu_tx_commit(tx); 619fa9e4066Sahrens } 620fa9e4066Sahrens 621ce636f8bSMatthew Ahrens void 622ce636f8bSMatthew Ahrens zil_destroy_sync(zilog_t *zilog, dmu_tx_t *tx) 623ce636f8bSMatthew Ahrens { 624ce636f8bSMatthew Ahrens ASSERT(list_is_empty(&zilog->zl_lwb_list)); 625ce636f8bSMatthew Ahrens (void) zil_parse(zilog, zil_free_log_block, 626ce636f8bSMatthew Ahrens zil_free_log_record, tx, zilog->zl_header->zh_claim_txg); 627ce636f8bSMatthew Ahrens } 628ce636f8bSMatthew Ahrens 6291d452cf5Sahrens int 630*12380e1eSArne Jansen zil_claim(dsl_pool_t *dp, dsl_dataset_t *ds, void *txarg) 631fa9e4066Sahrens { 632fa9e4066Sahrens dmu_tx_t *tx = txarg; 633fa9e4066Sahrens uint64_t first_txg = dmu_tx_get_txg(tx); 634fa9e4066Sahrens zilog_t *zilog; 635fa9e4066Sahrens zil_header_t *zh; 636fa9e4066Sahrens objset_t *os; 637fa9e4066Sahrens int error; 638fa9e4066Sahrens 639*12380e1eSArne Jansen error = dmu_objset_own_obj(dp, ds->ds_object, 640*12380e1eSArne Jansen DMU_OST_ANY, B_FALSE, FTAG, &os); 6413b2aab18SMatthew Ahrens if (error != 0) { 64222438533SMatthew Ahrens /* 64322438533SMatthew Ahrens * EBUSY indicates that the objset is inconsistent, in which 64422438533SMatthew Ahrens * case it can not have a ZIL. 64522438533SMatthew Ahrens */ 64622438533SMatthew Ahrens if (error != EBUSY) { 647*12380e1eSArne Jansen cmn_err(CE_WARN, "can't open objset for %llu, error %u", 648*12380e1eSArne Jansen (unsigned long long)ds->ds_object, error); 64922438533SMatthew Ahrens } 6501d452cf5Sahrens return (0); 651fa9e4066Sahrens } 652fa9e4066Sahrens 653fa9e4066Sahrens zilog = dmu_objset_zil(os); 654d80c45e0Sbonwick zh = zil_header_in_syncing_context(zilog); 655fa9e4066Sahrens 656b24ab676SJeff Bonwick if (spa_get_log_state(zilog->zl_spa) == SPA_LOG_CLEAR) { 657e6ca193dSGeorge Wilson if (!BP_IS_HOLE(&zh->zh_log)) 658b24ab676SJeff Bonwick zio_free_zil(zilog->zl_spa, first_txg, &zh->zh_log); 659e6ca193dSGeorge Wilson BP_ZERO(&zh->zh_log); 660e6ca193dSGeorge Wilson dsl_dataset_dirty(dmu_objset_ds(os), tx); 6613b2aab18SMatthew Ahrens dmu_objset_disown(os, FTAG); 662468c413aSTim Haley return (0); 663e6ca193dSGeorge Wilson } 664e6ca193dSGeorge Wilson 665fa9e4066Sahrens /* 666d80c45e0Sbonwick * Claim all log blocks if we haven't already done so, and remember 667d80c45e0Sbonwick * the highest claimed sequence number. This ensures that if we can 668d80c45e0Sbonwick * read only part of the log now (e.g. due to a missing device), 669d80c45e0Sbonwick * but we can read the entire log later, we will not try to replay 670d80c45e0Sbonwick * or destroy beyond the last block we successfully claimed. 671fa9e4066Sahrens */ 672fa9e4066Sahrens ASSERT3U(zh->zh_claim_txg, <=, first_txg); 673fa9e4066Sahrens if (zh->zh_claim_txg == 0 && !BP_IS_HOLE(&zh->zh_log)) { 674b24ab676SJeff Bonwick (void) zil_parse(zilog, zil_claim_log_block, 675d80c45e0Sbonwick zil_claim_log_record, tx, first_txg); 676b24ab676SJeff Bonwick zh->zh_claim_txg = first_txg; 677b24ab676SJeff Bonwick zh->zh_claim_blk_seq = zilog->zl_parse_blk_seq; 678b24ab676SJeff Bonwick zh->zh_claim_lr_seq = zilog->zl_parse_lr_seq; 679b24ab676SJeff Bonwick if (zilog->zl_parse_lr_count || zilog->zl_parse_blk_count > 1) 680b24ab676SJeff Bonwick zh->zh_flags |= ZIL_REPLAY_NEEDED; 681b24ab676SJeff Bonwick zh->zh_flags |= ZIL_CLAIM_LR_SEQ_VALID; 682fa9e4066Sahrens dsl_dataset_dirty(dmu_objset_ds(os), tx); 683fa9e4066Sahrens } 684d80c45e0Sbonwick 685fa9e4066Sahrens ASSERT3U(first_txg, ==, (spa_last_synced_txg(zilog->zl_spa) + 1)); 6863b2aab18SMatthew Ahrens dmu_objset_disown(os, FTAG); 6871d452cf5Sahrens return (0); 688b87f3af3Sperrin } 689b87f3af3Sperrin 690b87f3af3Sperrin /* 691b87f3af3Sperrin * Check the log by walking the log chain. 692b87f3af3Sperrin * Checksum errors are ok as they indicate the end of the chain. 693b87f3af3Sperrin * Any other error (no device or read failure) returns an error. 694b87f3af3Sperrin */ 695*12380e1eSArne Jansen /* ARGSUSED */ 696b87f3af3Sperrin int 697*12380e1eSArne Jansen zil_check_log_chain(dsl_pool_t *dp, dsl_dataset_t *ds, void *tx) 698b87f3af3Sperrin { 699b87f3af3Sperrin zilog_t *zilog; 700b87f3af3Sperrin objset_t *os; 7014b964adaSGeorge Wilson blkptr_t *bp; 702b87f3af3Sperrin int error; 703b87f3af3Sperrin 704b24ab676SJeff Bonwick ASSERT(tx == NULL); 705b24ab676SJeff Bonwick 706*12380e1eSArne Jansen error = dmu_objset_from_ds(ds, &os); 7073b2aab18SMatthew Ahrens if (error != 0) { 708*12380e1eSArne Jansen cmn_err(CE_WARN, "can't open objset %llu, error %d", 709*12380e1eSArne Jansen (unsigned long long)ds->ds_object, error); 710b87f3af3Sperrin return (0); 711b87f3af3Sperrin } 712b87f3af3Sperrin 713b87f3af3Sperrin zilog = dmu_objset_zil(os); 7144b964adaSGeorge Wilson bp = (blkptr_t *)&zilog->zl_header->zh_log; 7154b964adaSGeorge Wilson 7164b964adaSGeorge Wilson /* 7174b964adaSGeorge Wilson * Check the first block and determine if it's on a log device 7184b964adaSGeorge Wilson * which may have been removed or faulted prior to loading this 7194b964adaSGeorge Wilson * pool. If so, there's no point in checking the rest of the log 7204b964adaSGeorge Wilson * as its content should have already been synced to the pool. 7214b964adaSGeorge Wilson */ 7224b964adaSGeorge Wilson if (!BP_IS_HOLE(bp)) { 7234b964adaSGeorge Wilson vdev_t *vd; 7244b964adaSGeorge Wilson boolean_t valid = B_TRUE; 7254b964adaSGeorge Wilson 7264b964adaSGeorge Wilson spa_config_enter(os->os_spa, SCL_STATE, FTAG, RW_READER); 7274b964adaSGeorge Wilson vd = vdev_lookup_top(os->os_spa, DVA_GET_VDEV(&bp->blk_dva[0])); 7284b964adaSGeorge Wilson if (vd->vdev_islog && vdev_is_dead(vd)) 7294b964adaSGeorge Wilson valid = vdev_log_state_valid(vd); 7304b964adaSGeorge Wilson spa_config_exit(os->os_spa, SCL_STATE, FTAG); 7314b964adaSGeorge Wilson 732*12380e1eSArne Jansen if (!valid) 7334b964adaSGeorge Wilson return (0); 7344b964adaSGeorge Wilson } 735b87f3af3Sperrin 736b24ab676SJeff Bonwick /* 737b24ab676SJeff Bonwick * Because tx == NULL, zil_claim_log_block() will not actually claim 738b24ab676SJeff Bonwick * any blocks, but just determine whether it is possible to do so. 739b24ab676SJeff Bonwick * In addition to checking the log chain, zil_claim_log_block() 740b24ab676SJeff Bonwick * will invoke zio_claim() with a done func of spa_claim_notify(), 741b24ab676SJeff Bonwick * which will update spa_max_claim_txg. See spa_load() for details. 742b24ab676SJeff Bonwick */ 743b24ab676SJeff Bonwick error = zil_parse(zilog, zil_claim_log_block, zil_claim_log_record, tx, 744b24ab676SJeff Bonwick zilog->zl_header->zh_claim_txg ? -1ULL : spa_first_txg(os->os_spa)); 745b24ab676SJeff Bonwick 746b24ab676SJeff Bonwick return ((error == ECKSUM || error == ENOENT) ? 0 : error); 747b87f3af3Sperrin } 748b87f3af3Sperrin 74917f17c2dSbonwick static int 75017f17c2dSbonwick zil_vdev_compare(const void *x1, const void *x2) 75117f17c2dSbonwick { 7525002558fSNeil Perrin const uint64_t v1 = ((zil_vdev_node_t *)x1)->zv_vdev; 7535002558fSNeil Perrin const uint64_t v2 = ((zil_vdev_node_t *)x2)->zv_vdev; 75417f17c2dSbonwick 75517f17c2dSbonwick if (v1 < v2) 75617f17c2dSbonwick return (-1); 75717f17c2dSbonwick if (v1 > v2) 75817f17c2dSbonwick return (1); 75917f17c2dSbonwick 76017f17c2dSbonwick return (0); 76117f17c2dSbonwick } 76217f17c2dSbonwick 763fa9e4066Sahrens void 764b24ab676SJeff Bonwick zil_add_block(zilog_t *zilog, const blkptr_t *bp) 765fa9e4066Sahrens { 76617f17c2dSbonwick avl_tree_t *t = &zilog->zl_vdev_tree; 76717f17c2dSbonwick avl_index_t where; 76817f17c2dSbonwick zil_vdev_node_t *zv, zvsearch; 76917f17c2dSbonwick int ndvas = BP_GET_NDVAS(bp); 77017f17c2dSbonwick int i; 771fa9e4066Sahrens 772416e0cd8Sek if (zfs_nocacheflush) 773fa9e4066Sahrens return; 774fa9e4066Sahrens 77517f17c2dSbonwick ASSERT(zilog->zl_writer); 77617f17c2dSbonwick 77717f17c2dSbonwick /* 77817f17c2dSbonwick * Even though we're zl_writer, we still need a lock because the 77917f17c2dSbonwick * zl_get_data() callbacks may have dmu_sync() done callbacks 78017f17c2dSbonwick * that will run concurrently. 78117f17c2dSbonwick */ 78217f17c2dSbonwick mutex_enter(&zilog->zl_vdev_lock); 78317f17c2dSbonwick for (i = 0; i < ndvas; i++) { 78417f17c2dSbonwick zvsearch.zv_vdev = DVA_GET_VDEV(&bp->blk_dva[i]); 78517f17c2dSbonwick if (avl_find(t, &zvsearch, &where) == NULL) { 78617f17c2dSbonwick zv = kmem_alloc(sizeof (*zv), KM_SLEEP); 78717f17c2dSbonwick zv->zv_vdev = zvsearch.zv_vdev; 78817f17c2dSbonwick avl_insert(t, zv, where); 78967bd71c6Sperrin } 79067bd71c6Sperrin } 79117f17c2dSbonwick mutex_exit(&zilog->zl_vdev_lock); 792fa9e4066Sahrens } 793fa9e4066Sahrens 79491de656bSNeil Perrin static void 79567bd71c6Sperrin zil_flush_vdevs(zilog_t *zilog) 79667bd71c6Sperrin { 79767bd71c6Sperrin spa_t *spa = zilog->zl_spa; 79817f17c2dSbonwick avl_tree_t *t = &zilog->zl_vdev_tree; 79917f17c2dSbonwick void *cookie = NULL; 80017f17c2dSbonwick zil_vdev_node_t *zv; 80117f17c2dSbonwick zio_t *zio; 802fa9e4066Sahrens 80367bd71c6Sperrin ASSERT(zilog->zl_writer); 80467bd71c6Sperrin 80517f17c2dSbonwick /* 80617f17c2dSbonwick * We don't need zl_vdev_lock here because we're the zl_writer, 80717f17c2dSbonwick * and all zl_get_data() callbacks are done. 80817f17c2dSbonwick */ 80917f17c2dSbonwick if (avl_numnodes(t) == 0) 81017f17c2dSbonwick return; 81117f17c2dSbonwick 812e14bb325SJeff Bonwick spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 81317f17c2dSbonwick 814e14bb325SJeff Bonwick zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 815fa9e4066Sahrens 81617f17c2dSbonwick while ((zv = avl_destroy_nodes(t, &cookie)) != NULL) { 81717f17c2dSbonwick vdev_t *vd = vdev_lookup_top(spa, zv->zv_vdev); 81817f17c2dSbonwick if (vd != NULL) 81917f17c2dSbonwick zio_flush(zio, vd); 82017f17c2dSbonwick kmem_free(zv, sizeof (*zv)); 82167bd71c6Sperrin } 82217f17c2dSbonwick 823fa9e4066Sahrens /* 824fa9e4066Sahrens * Wait for all the flushes to complete. Not all devices actually 825fa9e4066Sahrens * support the DKIOCFLUSHWRITECACHE ioctl, so it's OK if it fails. 826fa9e4066Sahrens */ 82717f17c2dSbonwick (void) zio_wait(zio); 82817f17c2dSbonwick 829e14bb325SJeff Bonwick spa_config_exit(spa, SCL_STATE, FTAG); 830fa9e4066Sahrens } 831fa9e4066Sahrens 832fa9e4066Sahrens /* 833fa9e4066Sahrens * Function called when a log block write completes 834fa9e4066Sahrens */ 835fa9e4066Sahrens static void 836fa9e4066Sahrens zil_lwb_write_done(zio_t *zio) 837fa9e4066Sahrens { 838fa9e4066Sahrens lwb_t *lwb = zio->io_private; 839fa9e4066Sahrens zilog_t *zilog = lwb->lwb_zilog; 840b24ab676SJeff Bonwick dmu_tx_t *tx = lwb->lwb_tx; 841fa9e4066Sahrens 842e14bb325SJeff Bonwick ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); 843e14bb325SJeff Bonwick ASSERT(BP_GET_TYPE(zio->io_bp) == DMU_OT_INTENT_LOG); 844e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(zio->io_bp) == 0); 845e14bb325SJeff Bonwick ASSERT(BP_GET_BYTEORDER(zio->io_bp) == ZFS_HOST_BYTEORDER); 846e14bb325SJeff Bonwick ASSERT(!BP_IS_GANG(zio->io_bp)); 847e14bb325SJeff Bonwick ASSERT(!BP_IS_HOLE(zio->io_bp)); 8485d7b4d43SMatthew Ahrens ASSERT(BP_GET_FILL(zio->io_bp) == 0); 849e14bb325SJeff Bonwick 850fa9e4066Sahrens /* 851ef0d8e11SNeil Perrin * Ensure the lwb buffer pointer is cleared before releasing 852ef0d8e11SNeil Perrin * the txg. If we have had an allocation failure and 853ef0d8e11SNeil Perrin * the txg is waiting to sync then we want want zil_sync() 854ef0d8e11SNeil Perrin * to remove the lwb so that it's not picked up as the next new 855ef0d8e11SNeil Perrin * one in zil_commit_writer(). zil_sync() will only remove 856ef0d8e11SNeil Perrin * the lwb if lwb_buf is null. 857fa9e4066Sahrens */ 858fa9e4066Sahrens zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); 859fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 860fa9e4066Sahrens lwb->lwb_buf = NULL; 861b24ab676SJeff Bonwick lwb->lwb_tx = NULL; 862b24ab676SJeff Bonwick mutex_exit(&zilog->zl_lock); 863ef0d8e11SNeil Perrin 864ef0d8e11SNeil Perrin /* 865ef0d8e11SNeil Perrin * Now that we've written this log block, we have a stable pointer 866ef0d8e11SNeil Perrin * to the next block in the chain, so it's OK to let the txg in 867b24ab676SJeff Bonwick * which we allocated the next block sync. 868ef0d8e11SNeil Perrin */ 869b24ab676SJeff Bonwick dmu_tx_commit(tx); 870fa9e4066Sahrens } 871fa9e4066Sahrens 872c5c6ffa0Smaybee /* 873c5c6ffa0Smaybee * Initialize the io for a log block. 874c5c6ffa0Smaybee */ 875c5c6ffa0Smaybee static void 876c5c6ffa0Smaybee zil_lwb_write_init(zilog_t *zilog, lwb_t *lwb) 877c5c6ffa0Smaybee { 8787802d7bfSMatthew Ahrens zbookmark_phys_t zb; 879c5c6ffa0Smaybee 880b24ab676SJeff Bonwick SET_BOOKMARK(&zb, lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_OBJSET], 881b24ab676SJeff Bonwick ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, 882b24ab676SJeff Bonwick lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_SEQ]); 883c5c6ffa0Smaybee 884b19a79ecSperrin if (zilog->zl_root_zio == NULL) { 885b19a79ecSperrin zilog->zl_root_zio = zio_root(zilog->zl_spa, NULL, NULL, 886b19a79ecSperrin ZIO_FLAG_CANFAIL); 887b19a79ecSperrin } 88867bd71c6Sperrin if (lwb->lwb_zio == NULL) { 88967bd71c6Sperrin lwb->lwb_zio = zio_rewrite(zilog->zl_root_zio, zilog->zl_spa, 8906e1f5caaSNeil Perrin 0, &lwb->lwb_blk, lwb->lwb_buf, BP_GET_LSIZE(&lwb->lwb_blk), 89169962b56SMatthew Ahrens zil_lwb_write_done, lwb, ZIO_PRIORITY_SYNC_WRITE, 8928f18d1faSGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE, &zb); 89367bd71c6Sperrin } 894c5c6ffa0Smaybee } 895c5c6ffa0Smaybee 8966e1f5caaSNeil Perrin /* 8976e1f5caaSNeil Perrin * Define a limited set of intent log block sizes. 898f7170741SWill Andrews * 8996e1f5caaSNeil Perrin * These must be a multiple of 4KB. Note only the amount used (again 9006e1f5caaSNeil Perrin * aligned to 4KB) actually gets written. However, we can't always just 901b5152584SMatthew Ahrens * allocate SPA_OLD_MAXBLOCKSIZE as the slog space could be exhausted. 9026e1f5caaSNeil Perrin */ 9036e1f5caaSNeil Perrin uint64_t zil_block_buckets[] = { 9046e1f5caaSNeil Perrin 4096, /* non TX_WRITE */ 9056e1f5caaSNeil Perrin 8192+4096, /* data base */ 9066e1f5caaSNeil Perrin 32*1024 + 4096, /* NFS writes */ 9076e1f5caaSNeil Perrin UINT64_MAX 9086e1f5caaSNeil Perrin }; 9096e1f5caaSNeil Perrin 910d48e086fSNeil Perrin /* 911d48e086fSNeil Perrin * Use the slog as long as the logbias is 'latency' and the current commit size 912d48e086fSNeil Perrin * is less than the limit or the total list size is less than 2X the limit. 913d48e086fSNeil Perrin * Limit checking is disabled by setting zil_slog_limit to UINT64_MAX. 914d48e086fSNeil Perrin */ 915d48e086fSNeil Perrin uint64_t zil_slog_limit = 1024 * 1024; 916d48e086fSNeil Perrin #define USE_SLOG(zilog) (((zilog)->zl_logbias == ZFS_LOGBIAS_LATENCY) && \ 917d48e086fSNeil Perrin (((zilog)->zl_cur_used < zil_slog_limit) || \ 918d48e086fSNeil Perrin ((zilog)->zl_itx_list_sz < (zil_slog_limit << 1)))) 919d48e086fSNeil Perrin 920fa9e4066Sahrens /* 921fa9e4066Sahrens * Start a log block write and advance to the next log block. 922fa9e4066Sahrens * Calls are serialized. 923fa9e4066Sahrens */ 924fa9e4066Sahrens static lwb_t * 925fa9e4066Sahrens zil_lwb_write_start(zilog_t *zilog, lwb_t *lwb) 926fa9e4066Sahrens { 9276e1f5caaSNeil Perrin lwb_t *nlwb = NULL; 9286e1f5caaSNeil Perrin zil_chain_t *zilc; 929d80c45e0Sbonwick spa_t *spa = zilog->zl_spa; 9306e1f5caaSNeil Perrin blkptr_t *bp; 931b24ab676SJeff Bonwick dmu_tx_t *tx; 932fa9e4066Sahrens uint64_t txg; 933ada693c4SNeil Perrin uint64_t zil_blksz, wsz; 9346e1f5caaSNeil Perrin int i, error; 9356e1f5caaSNeil Perrin 9366e1f5caaSNeil Perrin if (BP_GET_CHECKSUM(&lwb->lwb_blk) == ZIO_CHECKSUM_ZILOG2) { 9376e1f5caaSNeil Perrin zilc = (zil_chain_t *)lwb->lwb_buf; 9386e1f5caaSNeil Perrin bp = &zilc->zc_next_blk; 9396e1f5caaSNeil Perrin } else { 9406e1f5caaSNeil Perrin zilc = (zil_chain_t *)(lwb->lwb_buf + lwb->lwb_sz); 9416e1f5caaSNeil Perrin bp = &zilc->zc_next_blk; 9426e1f5caaSNeil Perrin } 943fa9e4066Sahrens 9446e1f5caaSNeil Perrin ASSERT(lwb->lwb_nused <= lwb->lwb_sz); 945fa9e4066Sahrens 946fa9e4066Sahrens /* 947fa9e4066Sahrens * Allocate the next block and save its address in this block 948fa9e4066Sahrens * before writing it in order to establish the log chain. 949fa9e4066Sahrens * Note that if the allocation of nlwb synced before we wrote 950fa9e4066Sahrens * the block that points at it (lwb), we'd leak it if we crashed. 951b24ab676SJeff Bonwick * Therefore, we don't do dmu_tx_commit() until zil_lwb_write_done(). 952b24ab676SJeff Bonwick * We dirty the dataset to ensure that zil_sync() will be called 953b24ab676SJeff Bonwick * to clean up in the event of allocation failure or I/O failure. 954fa9e4066Sahrens */ 955b24ab676SJeff Bonwick tx = dmu_tx_create(zilog->zl_os); 956b24ab676SJeff Bonwick VERIFY(dmu_tx_assign(tx, TXG_WAIT) == 0); 957b24ab676SJeff Bonwick dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 958b24ab676SJeff Bonwick txg = dmu_tx_get_txg(tx); 959b24ab676SJeff Bonwick 960b24ab676SJeff Bonwick lwb->lwb_tx = tx; 961fa9e4066Sahrens 962fa9e4066Sahrens /* 9636e1f5caaSNeil Perrin * Log blocks are pre-allocated. Here we select the size of the next 9646e1f5caaSNeil Perrin * block, based on size used in the last block. 9656e1f5caaSNeil Perrin * - first find the smallest bucket that will fit the block from a 9666e1f5caaSNeil Perrin * limited set of block sizes. This is because it's faster to write 9676e1f5caaSNeil Perrin * blocks allocated from the same metaslab as they are adjacent or 9686e1f5caaSNeil Perrin * close. 9696e1f5caaSNeil Perrin * - next find the maximum from the new suggested size and an array of 9706e1f5caaSNeil Perrin * previous sizes. This lessens a picket fence effect of wrongly 9716e1f5caaSNeil Perrin * guesssing the size if we have a stream of say 2k, 64k, 2k, 64k 9726e1f5caaSNeil Perrin * requests. 9736e1f5caaSNeil Perrin * 9746e1f5caaSNeil Perrin * Note we only write what is used, but we can't just allocate 9756e1f5caaSNeil Perrin * the maximum block size because we can exhaust the available 9766e1f5caaSNeil Perrin * pool log space. 977fa9e4066Sahrens */ 9786e1f5caaSNeil Perrin zil_blksz = zilog->zl_cur_used + sizeof (zil_chain_t); 9796e1f5caaSNeil Perrin for (i = 0; zil_blksz > zil_block_buckets[i]; i++) 9806e1f5caaSNeil Perrin continue; 9816e1f5caaSNeil Perrin zil_blksz = zil_block_buckets[i]; 9826e1f5caaSNeil Perrin if (zil_blksz == UINT64_MAX) 983b5152584SMatthew Ahrens zil_blksz = SPA_OLD_MAXBLOCKSIZE; 9846e1f5caaSNeil Perrin zilog->zl_prev_blks[zilog->zl_prev_rotor] = zil_blksz; 9856e1f5caaSNeil Perrin for (i = 0; i < ZIL_PREV_BLKS; i++) 9866e1f5caaSNeil Perrin zil_blksz = MAX(zil_blksz, zilog->zl_prev_blks[i]); 9876e1f5caaSNeil Perrin zilog->zl_prev_rotor = (zilog->zl_prev_rotor + 1) & (ZIL_PREV_BLKS - 1); 988fa9e4066Sahrens 98967bd71c6Sperrin BP_ZERO(bp); 99067bd71c6Sperrin /* pass the old blkptr in order to spread log blocks across devs */ 991b24ab676SJeff Bonwick error = zio_alloc_zil(spa, txg, bp, &lwb->lwb_blk, zil_blksz, 992d48e086fSNeil Perrin USE_SLOG(zilog)); 9933b2aab18SMatthew Ahrens if (error == 0) { 9946e1f5caaSNeil Perrin ASSERT3U(bp->blk_birth, ==, txg); 9956e1f5caaSNeil Perrin bp->blk_cksum = lwb->lwb_blk.blk_cksum; 9966e1f5caaSNeil Perrin bp->blk_cksum.zc_word[ZIL_ZC_SEQ]++; 997d63d470bSgw 998ea8dc4b6Seschrock /* 9996e1f5caaSNeil Perrin * Allocate a new log write buffer (lwb). 1000ea8dc4b6Seschrock */ 10016e1f5caaSNeil Perrin nlwb = zil_alloc_lwb(zilog, bp, txg); 10026e1f5caaSNeil Perrin 10036e1f5caaSNeil Perrin /* Record the block for later vdev flushing */ 10046e1f5caaSNeil Perrin zil_add_block(zilog, &lwb->lwb_blk); 1005fa9e4066Sahrens } 1006fa9e4066Sahrens 10076e1f5caaSNeil Perrin if (BP_GET_CHECKSUM(&lwb->lwb_blk) == ZIO_CHECKSUM_ZILOG2) { 10086e1f5caaSNeil Perrin /* For Slim ZIL only write what is used. */ 1009ada693c4SNeil Perrin wsz = P2ROUNDUP_TYPED(lwb->lwb_nused, ZIL_MIN_BLKSZ, uint64_t); 1010ada693c4SNeil Perrin ASSERT3U(wsz, <=, lwb->lwb_sz); 1011ada693c4SNeil Perrin zio_shrink(lwb->lwb_zio, wsz); 1012fa9e4066Sahrens 1013ada693c4SNeil Perrin } else { 1014ada693c4SNeil Perrin wsz = lwb->lwb_sz; 10156e1f5caaSNeil Perrin } 1016ada693c4SNeil Perrin 10176e1f5caaSNeil Perrin zilc->zc_pad = 0; 10186e1f5caaSNeil Perrin zilc->zc_nused = lwb->lwb_nused; 10196e1f5caaSNeil Perrin zilc->zc_eck.zec_cksum = lwb->lwb_blk.blk_cksum; 1020fa9e4066Sahrens 1021ada693c4SNeil Perrin /* 1022ada693c4SNeil Perrin * clear unused data for security 1023ada693c4SNeil Perrin */ 1024ada693c4SNeil Perrin bzero(lwb->lwb_buf + lwb->lwb_nused, wsz - lwb->lwb_nused); 1025ada693c4SNeil Perrin 10266e1f5caaSNeil Perrin zio_nowait(lwb->lwb_zio); /* Kick off the write for the old log block */ 102767bd71c6Sperrin 1028fa9e4066Sahrens /* 10296e1f5caaSNeil Perrin * If there was an allocation failure then nlwb will be null which 10306e1f5caaSNeil Perrin * forces a txg_wait_synced(). 1031fa9e4066Sahrens */ 1032fa9e4066Sahrens return (nlwb); 1033fa9e4066Sahrens } 1034fa9e4066Sahrens 1035fa9e4066Sahrens static lwb_t * 1036fa9e4066Sahrens zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb) 1037fa9e4066Sahrens { 1038fa9e4066Sahrens lr_t *lrc = &itx->itx_lr; /* common log record */ 1039b24ab676SJeff Bonwick lr_write_t *lrw = (lr_write_t *)lrc; 1040b24ab676SJeff Bonwick char *lr_buf; 1041fa9e4066Sahrens uint64_t txg = lrc->lrc_txg; 1042fa9e4066Sahrens uint64_t reclen = lrc->lrc_reclen; 1043b24ab676SJeff Bonwick uint64_t dlen = 0; 1044fa9e4066Sahrens 1045fa9e4066Sahrens if (lwb == NULL) 1046fa9e4066Sahrens return (NULL); 1047b24ab676SJeff Bonwick 1048fa9e4066Sahrens ASSERT(lwb->lwb_buf != NULL); 1049ce636f8bSMatthew Ahrens ASSERT(zilog_is_dirty(zilog) || 1050ce636f8bSMatthew Ahrens spa_freeze_txg(zilog->zl_spa) != UINT64_MAX); 1051fa9e4066Sahrens 1052c5c6ffa0Smaybee if (lrc->lrc_txtype == TX_WRITE && itx->itx_wr_state == WR_NEED_COPY) 1053c5c6ffa0Smaybee dlen = P2ROUNDUP_TYPED( 1054b24ab676SJeff Bonwick lrw->lr_length, sizeof (uint64_t), uint64_t); 1055fa9e4066Sahrens 1056104e2ed7Sperrin zilog->zl_cur_used += (reclen + dlen); 105722ac5be4Sperrin 105867bd71c6Sperrin zil_lwb_write_init(zilog, lwb); 105967bd71c6Sperrin 1060fa9e4066Sahrens /* 1061fa9e4066Sahrens * If this record won't fit in the current log block, start a new one. 1062fa9e4066Sahrens */ 10636e1f5caaSNeil Perrin if (lwb->lwb_nused + reclen + dlen > lwb->lwb_sz) { 1064fa9e4066Sahrens lwb = zil_lwb_write_start(zilog, lwb); 1065c5c6ffa0Smaybee if (lwb == NULL) 1066fa9e4066Sahrens return (NULL); 106767bd71c6Sperrin zil_lwb_write_init(zilog, lwb); 10686e1f5caaSNeil Perrin ASSERT(LWB_EMPTY(lwb)); 10696e1f5caaSNeil Perrin if (lwb->lwb_nused + reclen + dlen > lwb->lwb_sz) { 1070fa9e4066Sahrens txg_wait_synced(zilog->zl_dmu_pool, txg); 1071fa9e4066Sahrens return (lwb); 1072fa9e4066Sahrens } 1073fa9e4066Sahrens } 1074fa9e4066Sahrens 1075b24ab676SJeff Bonwick lr_buf = lwb->lwb_buf + lwb->lwb_nused; 1076b24ab676SJeff Bonwick bcopy(lrc, lr_buf, reclen); 1077b24ab676SJeff Bonwick lrc = (lr_t *)lr_buf; 1078b24ab676SJeff Bonwick lrw = (lr_write_t *)lrc; 1079c5c6ffa0Smaybee 1080c5c6ffa0Smaybee /* 1081c5c6ffa0Smaybee * If it's a write, fetch the data or get its blkptr as appropriate. 1082c5c6ffa0Smaybee */ 1083c5c6ffa0Smaybee if (lrc->lrc_txtype == TX_WRITE) { 1084c5c6ffa0Smaybee if (txg > spa_freeze_txg(zilog->zl_spa)) 1085c5c6ffa0Smaybee txg_wait_synced(zilog->zl_dmu_pool, txg); 1086c5c6ffa0Smaybee if (itx->itx_wr_state != WR_COPIED) { 1087c5c6ffa0Smaybee char *dbuf; 1088c5c6ffa0Smaybee int error; 1089c5c6ffa0Smaybee 1090c5c6ffa0Smaybee if (dlen) { 1091c5c6ffa0Smaybee ASSERT(itx->itx_wr_state == WR_NEED_COPY); 1092b24ab676SJeff Bonwick dbuf = lr_buf + reclen; 1093b24ab676SJeff Bonwick lrw->lr_common.lrc_reclen += dlen; 1094c5c6ffa0Smaybee } else { 1095c5c6ffa0Smaybee ASSERT(itx->itx_wr_state == WR_INDIRECT); 1096c5c6ffa0Smaybee dbuf = NULL; 1097c5c6ffa0Smaybee } 1098c5c6ffa0Smaybee error = zilog->zl_get_data( 1099b24ab676SJeff Bonwick itx->itx_private, lrw, dbuf, lwb->lwb_zio); 1100c87b8fc5SMark J Musante if (error == EIO) { 1101c87b8fc5SMark J Musante txg_wait_synced(zilog->zl_dmu_pool, txg); 1102c87b8fc5SMark J Musante return (lwb); 1103c87b8fc5SMark J Musante } 11043b2aab18SMatthew Ahrens if (error != 0) { 1105c5c6ffa0Smaybee ASSERT(error == ENOENT || error == EEXIST || 1106c5c6ffa0Smaybee error == EALREADY); 1107c5c6ffa0Smaybee return (lwb); 1108c5c6ffa0Smaybee } 1109c5c6ffa0Smaybee } 1110104e2ed7Sperrin } 1111c5c6ffa0Smaybee 1112b24ab676SJeff Bonwick /* 1113b24ab676SJeff Bonwick * We're actually making an entry, so update lrc_seq to be the 1114b24ab676SJeff Bonwick * log record sequence number. Note that this is generally not 1115b24ab676SJeff Bonwick * equal to the itx sequence number because not all transactions 1116b24ab676SJeff Bonwick * are synchronous, and sometimes spa_sync() gets there first. 1117b24ab676SJeff Bonwick */ 1118b24ab676SJeff Bonwick lrc->lrc_seq = ++zilog->zl_lr_seq; /* we are single threaded */ 1119c5c6ffa0Smaybee lwb->lwb_nused += reclen + dlen; 1120fa9e4066Sahrens lwb->lwb_max_txg = MAX(lwb->lwb_max_txg, txg); 11216e1f5caaSNeil Perrin ASSERT3U(lwb->lwb_nused, <=, lwb->lwb_sz); 1122fb09f5aaSMadhav Suresh ASSERT0(P2PHASE(lwb->lwb_nused, sizeof (uint64_t))); 1123fa9e4066Sahrens 1124fa9e4066Sahrens return (lwb); 1125fa9e4066Sahrens } 1126fa9e4066Sahrens 1127fa9e4066Sahrens itx_t * 1128da6c28aaSamw zil_itx_create(uint64_t txtype, size_t lrsize) 1129fa9e4066Sahrens { 1130fa9e4066Sahrens itx_t *itx; 1131fa9e4066Sahrens 1132b4d654b0Sperrin lrsize = P2ROUNDUP_TYPED(lrsize, sizeof (uint64_t), size_t); 1133fa9e4066Sahrens 1134fa9e4066Sahrens itx = kmem_alloc(offsetof(itx_t, itx_lr) + lrsize, KM_SLEEP); 1135fa9e4066Sahrens itx->itx_lr.lrc_txtype = txtype; 1136fa9e4066Sahrens itx->itx_lr.lrc_reclen = lrsize; 1137abf76b6eSperrin itx->itx_sod = lrsize; /* if write & WR_NEED_COPY will be increased */ 1138fa9e4066Sahrens itx->itx_lr.lrc_seq = 0; /* defensive */ 11395002558fSNeil Perrin itx->itx_sync = B_TRUE; /* default is synchronous */ 1140fa9e4066Sahrens 1141fa9e4066Sahrens return (itx); 1142fa9e4066Sahrens } 1143fa9e4066Sahrens 1144b24ab676SJeff Bonwick void 1145b24ab676SJeff Bonwick zil_itx_destroy(itx_t *itx) 1146b24ab676SJeff Bonwick { 1147b24ab676SJeff Bonwick kmem_free(itx, offsetof(itx_t, itx_lr) + itx->itx_lr.lrc_reclen); 1148b24ab676SJeff Bonwick } 1149b24ab676SJeff Bonwick 11505002558fSNeil Perrin /* 11515002558fSNeil Perrin * Free up the sync and async itxs. The itxs_t has already been detached 11525002558fSNeil Perrin * so no locks are needed. 11535002558fSNeil Perrin */ 11545002558fSNeil Perrin static void 11555002558fSNeil Perrin zil_itxg_clean(itxs_t *itxs) 1156fa9e4066Sahrens { 11575002558fSNeil Perrin itx_t *itx; 11585002558fSNeil Perrin list_t *list; 11595002558fSNeil Perrin avl_tree_t *t; 11605002558fSNeil Perrin void *cookie; 11615002558fSNeil Perrin itx_async_node_t *ian; 11625002558fSNeil Perrin 11635002558fSNeil Perrin list = &itxs->i_sync_list; 11645002558fSNeil Perrin while ((itx = list_head(list)) != NULL) { 11655002558fSNeil Perrin list_remove(list, itx); 11665002558fSNeil Perrin kmem_free(itx, offsetof(itx_t, itx_lr) + 11675002558fSNeil Perrin itx->itx_lr.lrc_reclen); 11685002558fSNeil Perrin } 1169fa9e4066Sahrens 11705002558fSNeil Perrin cookie = NULL; 11715002558fSNeil Perrin t = &itxs->i_async_tree; 11725002558fSNeil Perrin while ((ian = avl_destroy_nodes(t, &cookie)) != NULL) { 11735002558fSNeil Perrin list = &ian->ia_list; 11745002558fSNeil Perrin while ((itx = list_head(list)) != NULL) { 11755002558fSNeil Perrin list_remove(list, itx); 11765002558fSNeil Perrin kmem_free(itx, offsetof(itx_t, itx_lr) + 11775002558fSNeil Perrin itx->itx_lr.lrc_reclen); 11785002558fSNeil Perrin } 11795002558fSNeil Perrin list_destroy(list); 11805002558fSNeil Perrin kmem_free(ian, sizeof (itx_async_node_t)); 11815002558fSNeil Perrin } 11825002558fSNeil Perrin avl_destroy(t); 1183fa9e4066Sahrens 11845002558fSNeil Perrin kmem_free(itxs, sizeof (itxs_t)); 11855002558fSNeil Perrin } 11865002558fSNeil Perrin 11875002558fSNeil Perrin static int 11885002558fSNeil Perrin zil_aitx_compare(const void *x1, const void *x2) 11895002558fSNeil Perrin { 11905002558fSNeil Perrin const uint64_t o1 = ((itx_async_node_t *)x1)->ia_foid; 11915002558fSNeil Perrin const uint64_t o2 = ((itx_async_node_t *)x2)->ia_foid; 1192fa9e4066Sahrens 11935002558fSNeil Perrin if (o1 < o2) 11945002558fSNeil Perrin return (-1); 11955002558fSNeil Perrin if (o1 > o2) 11965002558fSNeil Perrin return (1); 11975002558fSNeil Perrin 11985002558fSNeil Perrin return (0); 1199fa9e4066Sahrens } 1200fa9e4066Sahrens 1201fa9e4066Sahrens /* 12025002558fSNeil Perrin * Remove all async itx with the given oid. 1203fa9e4066Sahrens */ 120491de656bSNeil Perrin static void 12055002558fSNeil Perrin zil_remove_async(zilog_t *zilog, uint64_t oid) 1206fa9e4066Sahrens { 12075002558fSNeil Perrin uint64_t otxg, txg; 12085002558fSNeil Perrin itx_async_node_t *ian; 12095002558fSNeil Perrin avl_tree_t *t; 12105002558fSNeil Perrin avl_index_t where; 1211a584ef65Sjohansen list_t clean_list; 1212fa9e4066Sahrens itx_t *itx; 1213fa9e4066Sahrens 12145002558fSNeil Perrin ASSERT(oid != 0); 1215a584ef65Sjohansen list_create(&clean_list, sizeof (itx_t), offsetof(itx_t, itx_node)); 1216a584ef65Sjohansen 12175002558fSNeil Perrin if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */ 12185002558fSNeil Perrin otxg = ZILTEST_TXG; 12195002558fSNeil Perrin else 12205002558fSNeil Perrin otxg = spa_last_synced_txg(zilog->zl_spa) + 1; 1221a584ef65Sjohansen 12225002558fSNeil Perrin for (txg = otxg; txg < (otxg + TXG_CONCURRENT_STATES); txg++) { 12235002558fSNeil Perrin itxg_t *itxg = &zilog->zl_itxg[txg & TXG_MASK]; 12245002558fSNeil Perrin 12255002558fSNeil Perrin mutex_enter(&itxg->itxg_lock); 12265002558fSNeil Perrin if (itxg->itxg_txg != txg) { 12275002558fSNeil Perrin mutex_exit(&itxg->itxg_lock); 12285002558fSNeil Perrin continue; 12295002558fSNeil Perrin } 1230a584ef65Sjohansen 12315002558fSNeil Perrin /* 12325002558fSNeil Perrin * Locate the object node and append its list. 12335002558fSNeil Perrin */ 12345002558fSNeil Perrin t = &itxg->itxg_itxs->i_async_tree; 12355002558fSNeil Perrin ian = avl_find(t, &oid, &where); 12365002558fSNeil Perrin if (ian != NULL) 12375002558fSNeil Perrin list_move_tail(&clean_list, &ian->ia_list); 12385002558fSNeil Perrin mutex_exit(&itxg->itxg_lock); 12395002558fSNeil Perrin } 1240a584ef65Sjohansen while ((itx = list_head(&clean_list)) != NULL) { 1241a584ef65Sjohansen list_remove(&clean_list, itx); 12425002558fSNeil Perrin kmem_free(itx, offsetof(itx_t, itx_lr) + 12435002558fSNeil Perrin itx->itx_lr.lrc_reclen); 1244a584ef65Sjohansen } 1245a584ef65Sjohansen list_destroy(&clean_list); 1246fa9e4066Sahrens } 1247fa9e4066Sahrens 12485002558fSNeil Perrin void 12495002558fSNeil Perrin zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx) 12505002558fSNeil Perrin { 12515002558fSNeil Perrin uint64_t txg; 12525002558fSNeil Perrin itxg_t *itxg; 12535002558fSNeil Perrin itxs_t *itxs, *clean = NULL; 12545002558fSNeil Perrin 12555002558fSNeil Perrin /* 125691de656bSNeil Perrin * Object ids can be re-instantiated in the next txg so 12575002558fSNeil Perrin * remove any async transactions to avoid future leaks. 12585002558fSNeil Perrin * This can happen if a fsync occurs on the re-instantiated 12595002558fSNeil Perrin * object for a WR_INDIRECT or WR_NEED_COPY write, which gets 12605002558fSNeil Perrin * the new file data and flushes a write record for the old object. 12615002558fSNeil Perrin */ 12625002558fSNeil Perrin if ((itx->itx_lr.lrc_txtype & ~TX_CI) == TX_REMOVE) 126351bd2f97SNeil Perrin zil_remove_async(zilog, itx->itx_oid); 12645002558fSNeil Perrin 126591de656bSNeil Perrin /* 126691de656bSNeil Perrin * Ensure the data of a renamed file is committed before the rename. 126791de656bSNeil Perrin */ 126891de656bSNeil Perrin if ((itx->itx_lr.lrc_txtype & ~TX_CI) == TX_RENAME) 126991de656bSNeil Perrin zil_async_to_sync(zilog, itx->itx_oid); 127091de656bSNeil Perrin 1271ce636f8bSMatthew Ahrens if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) 12725002558fSNeil Perrin txg = ZILTEST_TXG; 12735002558fSNeil Perrin else 12745002558fSNeil Perrin txg = dmu_tx_get_txg(tx); 12755002558fSNeil Perrin 12765002558fSNeil Perrin itxg = &zilog->zl_itxg[txg & TXG_MASK]; 12775002558fSNeil Perrin mutex_enter(&itxg->itxg_lock); 12785002558fSNeil Perrin itxs = itxg->itxg_itxs; 12795002558fSNeil Perrin if (itxg->itxg_txg != txg) { 12805002558fSNeil Perrin if (itxs != NULL) { 12815002558fSNeil Perrin /* 12825002558fSNeil Perrin * The zil_clean callback hasn't got around to cleaning 12835002558fSNeil Perrin * this itxg. Save the itxs for release below. 12845002558fSNeil Perrin * This should be rare. 12855002558fSNeil Perrin */ 12865002558fSNeil Perrin atomic_add_64(&zilog->zl_itx_list_sz, -itxg->itxg_sod); 12875002558fSNeil Perrin itxg->itxg_sod = 0; 12885002558fSNeil Perrin clean = itxg->itxg_itxs; 12895002558fSNeil Perrin } 12905002558fSNeil Perrin ASSERT(itxg->itxg_sod == 0); 12915002558fSNeil Perrin itxg->itxg_txg = txg; 12925002558fSNeil Perrin itxs = itxg->itxg_itxs = kmem_zalloc(sizeof (itxs_t), KM_SLEEP); 12935002558fSNeil Perrin 12945002558fSNeil Perrin list_create(&itxs->i_sync_list, sizeof (itx_t), 12955002558fSNeil Perrin offsetof(itx_t, itx_node)); 12965002558fSNeil Perrin avl_create(&itxs->i_async_tree, zil_aitx_compare, 12975002558fSNeil Perrin sizeof (itx_async_node_t), 12985002558fSNeil Perrin offsetof(itx_async_node_t, ia_node)); 12995002558fSNeil Perrin } 13005002558fSNeil Perrin if (itx->itx_sync) { 13015002558fSNeil Perrin list_insert_tail(&itxs->i_sync_list, itx); 13025002558fSNeil Perrin atomic_add_64(&zilog->zl_itx_list_sz, itx->itx_sod); 13035002558fSNeil Perrin itxg->itxg_sod += itx->itx_sod; 13045002558fSNeil Perrin } else { 13055002558fSNeil Perrin avl_tree_t *t = &itxs->i_async_tree; 13065002558fSNeil Perrin uint64_t foid = ((lr_ooo_t *)&itx->itx_lr)->lr_foid; 13075002558fSNeil Perrin itx_async_node_t *ian; 13085002558fSNeil Perrin avl_index_t where; 13095002558fSNeil Perrin 13105002558fSNeil Perrin ian = avl_find(t, &foid, &where); 13115002558fSNeil Perrin if (ian == NULL) { 13125002558fSNeil Perrin ian = kmem_alloc(sizeof (itx_async_node_t), KM_SLEEP); 13135002558fSNeil Perrin list_create(&ian->ia_list, sizeof (itx_t), 13145002558fSNeil Perrin offsetof(itx_t, itx_node)); 13155002558fSNeil Perrin ian->ia_foid = foid; 13165002558fSNeil Perrin avl_insert(t, ian, where); 13175002558fSNeil Perrin } 13185002558fSNeil Perrin list_insert_tail(&ian->ia_list, itx); 13195002558fSNeil Perrin } 13205002558fSNeil Perrin 13215002558fSNeil Perrin itx->itx_lr.lrc_txg = dmu_tx_get_txg(tx); 1322ce636f8bSMatthew Ahrens zilog_dirty(zilog, txg); 13235002558fSNeil Perrin mutex_exit(&itxg->itxg_lock); 13245002558fSNeil Perrin 13255002558fSNeil Perrin /* Release the old itxs now we've dropped the lock */ 13265002558fSNeil Perrin if (clean != NULL) 13275002558fSNeil Perrin zil_itxg_clean(clean); 13285002558fSNeil Perrin } 13295002558fSNeil Perrin 1330b19a79ecSperrin /* 133167bd71c6Sperrin * If there are any in-memory intent log transactions which have now been 1332ce636f8bSMatthew Ahrens * synced then start up a taskq to free them. We should only do this after we 1333ce636f8bSMatthew Ahrens * have written out the uberblocks (i.e. txg has been comitted) so that 1334ce636f8bSMatthew Ahrens * don't inadvertently clean out in-memory log records that would be required 1335ce636f8bSMatthew Ahrens * by zil_commit(). 1336b19a79ecSperrin */ 1337fa9e4066Sahrens void 13385002558fSNeil Perrin zil_clean(zilog_t *zilog, uint64_t synced_txg) 1339fa9e4066Sahrens { 13405002558fSNeil Perrin itxg_t *itxg = &zilog->zl_itxg[synced_txg & TXG_MASK]; 13415002558fSNeil Perrin itxs_t *clean_me; 134267bd71c6Sperrin 13435002558fSNeil Perrin mutex_enter(&itxg->itxg_lock); 13445002558fSNeil Perrin if (itxg->itxg_itxs == NULL || itxg->itxg_txg == ZILTEST_TXG) { 13455002558fSNeil Perrin mutex_exit(&itxg->itxg_lock); 13465002558fSNeil Perrin return; 13475002558fSNeil Perrin } 13485002558fSNeil Perrin ASSERT3U(itxg->itxg_txg, <=, synced_txg); 13495002558fSNeil Perrin ASSERT(itxg->itxg_txg != 0); 13505002558fSNeil Perrin ASSERT(zilog->zl_clean_taskq != NULL); 13515002558fSNeil Perrin atomic_add_64(&zilog->zl_itx_list_sz, -itxg->itxg_sod); 13525002558fSNeil Perrin itxg->itxg_sod = 0; 13535002558fSNeil Perrin clean_me = itxg->itxg_itxs; 13545002558fSNeil Perrin itxg->itxg_itxs = NULL; 13555002558fSNeil Perrin itxg->itxg_txg = 0; 13565002558fSNeil Perrin mutex_exit(&itxg->itxg_lock); 13575002558fSNeil Perrin /* 13585002558fSNeil Perrin * Preferably start a task queue to free up the old itxs but 13595002558fSNeil Perrin * if taskq_dispatch can't allocate resources to do that then 13605002558fSNeil Perrin * free it in-line. This should be rare. Note, using TQ_SLEEP 13615002558fSNeil Perrin * created a bad performance problem. 13625002558fSNeil Perrin */ 13635002558fSNeil Perrin if (taskq_dispatch(zilog->zl_clean_taskq, 13645002558fSNeil Perrin (void (*)(void *))zil_itxg_clean, clean_me, TQ_NOSLEEP) == NULL) 13655002558fSNeil Perrin zil_itxg_clean(clean_me); 13665002558fSNeil Perrin } 13675002558fSNeil Perrin 13685002558fSNeil Perrin /* 13695002558fSNeil Perrin * Get the list of itxs to commit into zl_itx_commit_list. 13705002558fSNeil Perrin */ 137191de656bSNeil Perrin static void 13725002558fSNeil Perrin zil_get_commit_list(zilog_t *zilog) 13735002558fSNeil Perrin { 13745002558fSNeil Perrin uint64_t otxg, txg; 13755002558fSNeil Perrin list_t *commit_list = &zilog->zl_itx_commit_list; 13765002558fSNeil Perrin uint64_t push_sod = 0; 13775002558fSNeil Perrin 13785002558fSNeil Perrin if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */ 13795002558fSNeil Perrin otxg = ZILTEST_TXG; 13805002558fSNeil Perrin else 13815002558fSNeil Perrin otxg = spa_last_synced_txg(zilog->zl_spa) + 1; 13825002558fSNeil Perrin 13835002558fSNeil Perrin for (txg = otxg; txg < (otxg + TXG_CONCURRENT_STATES); txg++) { 13845002558fSNeil Perrin itxg_t *itxg = &zilog->zl_itxg[txg & TXG_MASK]; 13855002558fSNeil Perrin 13865002558fSNeil Perrin mutex_enter(&itxg->itxg_lock); 13875002558fSNeil Perrin if (itxg->itxg_txg != txg) { 13885002558fSNeil Perrin mutex_exit(&itxg->itxg_lock); 13895002558fSNeil Perrin continue; 13905002558fSNeil Perrin } 13915002558fSNeil Perrin 13925002558fSNeil Perrin list_move_tail(commit_list, &itxg->itxg_itxs->i_sync_list); 13935002558fSNeil Perrin push_sod += itxg->itxg_sod; 13945002558fSNeil Perrin itxg->itxg_sod = 0; 13955002558fSNeil Perrin 13965002558fSNeil Perrin mutex_exit(&itxg->itxg_lock); 13975002558fSNeil Perrin } 13985002558fSNeil Perrin atomic_add_64(&zilog->zl_itx_list_sz, -push_sod); 13995002558fSNeil Perrin } 14005002558fSNeil Perrin 14015002558fSNeil Perrin /* 14025002558fSNeil Perrin * Move the async itxs for a specified object to commit into sync lists. 14035002558fSNeil Perrin */ 140491de656bSNeil Perrin static void 14055002558fSNeil Perrin zil_async_to_sync(zilog_t *zilog, uint64_t foid) 14065002558fSNeil Perrin { 14075002558fSNeil Perrin uint64_t otxg, txg; 14085002558fSNeil Perrin itx_async_node_t *ian; 14095002558fSNeil Perrin avl_tree_t *t; 14105002558fSNeil Perrin avl_index_t where; 14115002558fSNeil Perrin 14125002558fSNeil Perrin if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */ 14135002558fSNeil Perrin otxg = ZILTEST_TXG; 14145002558fSNeil Perrin else 14155002558fSNeil Perrin otxg = spa_last_synced_txg(zilog->zl_spa) + 1; 14165002558fSNeil Perrin 14175002558fSNeil Perrin for (txg = otxg; txg < (otxg + TXG_CONCURRENT_STATES); txg++) { 14185002558fSNeil Perrin itxg_t *itxg = &zilog->zl_itxg[txg & TXG_MASK]; 14195002558fSNeil Perrin 14205002558fSNeil Perrin mutex_enter(&itxg->itxg_lock); 14215002558fSNeil Perrin if (itxg->itxg_txg != txg) { 14225002558fSNeil Perrin mutex_exit(&itxg->itxg_lock); 14235002558fSNeil Perrin continue; 14245002558fSNeil Perrin } 14255002558fSNeil Perrin 14265002558fSNeil Perrin /* 14275002558fSNeil Perrin * If a foid is specified then find that node and append its 14285002558fSNeil Perrin * list. Otherwise walk the tree appending all the lists 14295002558fSNeil Perrin * to the sync list. We add to the end rather than the 14305002558fSNeil Perrin * beginning to ensure the create has happened. 14315002558fSNeil Perrin */ 14325002558fSNeil Perrin t = &itxg->itxg_itxs->i_async_tree; 14335002558fSNeil Perrin if (foid != 0) { 14345002558fSNeil Perrin ian = avl_find(t, &foid, &where); 14355002558fSNeil Perrin if (ian != NULL) { 14365002558fSNeil Perrin list_move_tail(&itxg->itxg_itxs->i_sync_list, 14375002558fSNeil Perrin &ian->ia_list); 14385002558fSNeil Perrin } 14395002558fSNeil Perrin } else { 14405002558fSNeil Perrin void *cookie = NULL; 14415002558fSNeil Perrin 14425002558fSNeil Perrin while ((ian = avl_destroy_nodes(t, &cookie)) != NULL) { 14435002558fSNeil Perrin list_move_tail(&itxg->itxg_itxs->i_sync_list, 14445002558fSNeil Perrin &ian->ia_list); 14455002558fSNeil Perrin list_destroy(&ian->ia_list); 14465002558fSNeil Perrin kmem_free(ian, sizeof (itx_async_node_t)); 14475002558fSNeil Perrin } 14485002558fSNeil Perrin } 14495002558fSNeil Perrin mutex_exit(&itxg->itxg_lock); 145067bd71c6Sperrin } 1451fa9e4066Sahrens } 1452fa9e4066Sahrens 1453e14bb325SJeff Bonwick static void 14545002558fSNeil Perrin zil_commit_writer(zilog_t *zilog) 1455fa9e4066Sahrens { 1456fa9e4066Sahrens uint64_t txg; 14575002558fSNeil Perrin itx_t *itx; 1458fa9e4066Sahrens lwb_t *lwb; 14595002558fSNeil Perrin spa_t *spa = zilog->zl_spa; 1460b24ab676SJeff Bonwick int error = 0; 1461fa9e4066Sahrens 1462e14bb325SJeff Bonwick ASSERT(zilog->zl_root_zio == NULL); 14635002558fSNeil Perrin 14645002558fSNeil Perrin mutex_exit(&zilog->zl_lock); 14655002558fSNeil Perrin 14665002558fSNeil Perrin zil_get_commit_list(zilog); 14675002558fSNeil Perrin 14685002558fSNeil Perrin /* 14695002558fSNeil Perrin * Return if there's nothing to commit before we dirty the fs by 14705002558fSNeil Perrin * calling zil_create(). 14715002558fSNeil Perrin */ 14725002558fSNeil Perrin if (list_head(&zilog->zl_itx_commit_list) == NULL) { 14735002558fSNeil Perrin mutex_enter(&zilog->zl_lock); 14745002558fSNeil Perrin return; 14755002558fSNeil Perrin } 1476fa9e4066Sahrens 1477fa9e4066Sahrens if (zilog->zl_suspend) { 1478fa9e4066Sahrens lwb = NULL; 1479fa9e4066Sahrens } else { 1480fa9e4066Sahrens lwb = list_tail(&zilog->zl_lwb_list); 14815002558fSNeil Perrin if (lwb == NULL) 14826e1f5caaSNeil Perrin lwb = zil_create(zilog); 1483fa9e4066Sahrens } 1484fa9e4066Sahrens 1485b19a79ecSperrin DTRACE_PROBE1(zil__cw1, zilog_t *, zilog); 14865002558fSNeil Perrin while (itx = list_head(&zilog->zl_itx_commit_list)) { 1487fa9e4066Sahrens txg = itx->itx_lr.lrc_txg; 1488fa9e4066Sahrens ASSERT(txg); 1489fa9e4066Sahrens 14905002558fSNeil Perrin if (txg > spa_last_synced_txg(spa) || txg > spa_freeze_txg(spa)) 1491fa9e4066Sahrens lwb = zil_lwb_commit(zilog, itx, lwb); 14925002558fSNeil Perrin list_remove(&zilog->zl_itx_commit_list, itx); 14935002558fSNeil Perrin kmem_free(itx, offsetof(itx_t, itx_lr) 14945002558fSNeil Perrin + itx->itx_lr.lrc_reclen); 1495fa9e4066Sahrens } 1496b19a79ecSperrin DTRACE_PROBE1(zil__cw2, zilog_t *, zilog); 1497fa9e4066Sahrens 1498fa9e4066Sahrens /* write the last block out */ 149967bd71c6Sperrin if (lwb != NULL && lwb->lwb_zio != NULL) 1500fa9e4066Sahrens lwb = zil_lwb_write_start(zilog, lwb); 1501fa9e4066Sahrens 150222ac5be4Sperrin zilog->zl_cur_used = 0; 1503fa9e4066Sahrens 1504fa9e4066Sahrens /* 1505b19a79ecSperrin * Wait if necessary for the log blocks to be on stable storage. 1506fa9e4066Sahrens */ 1507b19a79ecSperrin if (zilog->zl_root_zio) { 1508b24ab676SJeff Bonwick error = zio_wait(zilog->zl_root_zio); 1509e14bb325SJeff Bonwick zilog->zl_root_zio = NULL; 151017f17c2dSbonwick zil_flush_vdevs(zilog); 1511fa9e4066Sahrens } 151222ac5be4Sperrin 1513b24ab676SJeff Bonwick if (error || lwb == NULL) 1514fa9e4066Sahrens txg_wait_synced(zilog->zl_dmu_pool, 0); 151567bd71c6Sperrin 151667bd71c6Sperrin mutex_enter(&zilog->zl_lock); 1517b24ab676SJeff Bonwick 1518b24ab676SJeff Bonwick /* 1519b24ab676SJeff Bonwick * Remember the highest committed log sequence number for ztest. 1520b24ab676SJeff Bonwick * We only update this value when all the log writes succeeded, 1521b24ab676SJeff Bonwick * because ztest wants to ASSERT that it got the whole log chain. 1522b24ab676SJeff Bonwick */ 1523b24ab676SJeff Bonwick if (error == 0 && lwb != NULL) 1524b24ab676SJeff Bonwick zilog->zl_commit_lr_seq = zilog->zl_lr_seq; 1525b19a79ecSperrin } 1526b19a79ecSperrin 1527b19a79ecSperrin /* 15285002558fSNeil Perrin * Commit zfs transactions to stable storage. 1529b19a79ecSperrin * If foid is 0 push out all transactions, otherwise push only those 15305002558fSNeil Perrin * for that object or might reference that object. 15315002558fSNeil Perrin * 15325002558fSNeil Perrin * itxs are committed in batches. In a heavily stressed zil there will be 15335002558fSNeil Perrin * a commit writer thread who is writing out a bunch of itxs to the log 15345002558fSNeil Perrin * for a set of committing threads (cthreads) in the same batch as the writer. 15355002558fSNeil Perrin * Those cthreads are all waiting on the same cv for that batch. 15365002558fSNeil Perrin * 15375002558fSNeil Perrin * There will also be a different and growing batch of threads that are 15385002558fSNeil Perrin * waiting to commit (qthreads). When the committing batch completes 15395002558fSNeil Perrin * a transition occurs such that the cthreads exit and the qthreads become 15405002558fSNeil Perrin * cthreads. One of the new cthreads becomes the writer thread for the 15415002558fSNeil Perrin * batch. Any new threads arriving become new qthreads. 15425002558fSNeil Perrin * 15435002558fSNeil Perrin * Only 2 condition variables are needed and there's no transition 15445002558fSNeil Perrin * between the two cvs needed. They just flip-flop between qthreads 15455002558fSNeil Perrin * and cthreads. 15465002558fSNeil Perrin * 15475002558fSNeil Perrin * Using this scheme we can efficiently wakeup up only those threads 15485002558fSNeil Perrin * that have been committed. 1549b19a79ecSperrin */ 1550b19a79ecSperrin void 15515002558fSNeil Perrin zil_commit(zilog_t *zilog, uint64_t foid) 1552b19a79ecSperrin { 15535002558fSNeil Perrin uint64_t mybatch; 1554b19a79ecSperrin 15555002558fSNeil Perrin if (zilog->zl_sync == ZFS_SYNC_DISABLED) 15565002558fSNeil Perrin return; 1557b19a79ecSperrin 15585002558fSNeil Perrin /* move the async itxs for the foid to the sync queues */ 15595002558fSNeil Perrin zil_async_to_sync(zilog, foid); 1560b19a79ecSperrin 15615002558fSNeil Perrin mutex_enter(&zilog->zl_lock); 15625002558fSNeil Perrin mybatch = zilog->zl_next_batch; 156367bd71c6Sperrin while (zilog->zl_writer) { 15645002558fSNeil Perrin cv_wait(&zilog->zl_cv_batch[mybatch & 1], &zilog->zl_lock); 15655002558fSNeil Perrin if (mybatch <= zilog->zl_com_batch) { 156667bd71c6Sperrin mutex_exit(&zilog->zl_lock); 156767bd71c6Sperrin return; 156867bd71c6Sperrin } 156967bd71c6Sperrin } 1570b24ab676SJeff Bonwick 15715002558fSNeil Perrin zilog->zl_next_batch++; 15725002558fSNeil Perrin zilog->zl_writer = B_TRUE; 15735002558fSNeil Perrin zil_commit_writer(zilog); 15745002558fSNeil Perrin zilog->zl_com_batch = mybatch; 15755002558fSNeil Perrin zilog->zl_writer = B_FALSE; 15765002558fSNeil Perrin mutex_exit(&zilog->zl_lock); 1577b24ab676SJeff Bonwick 15785002558fSNeil Perrin /* wake up one thread to become the next writer */ 15795002558fSNeil Perrin cv_signal(&zilog->zl_cv_batch[(mybatch+1) & 1]); 1580b24ab676SJeff Bonwick 15815002558fSNeil Perrin /* wake up all threads waiting for this batch to be committed */ 15825002558fSNeil Perrin cv_broadcast(&zilog->zl_cv_batch[mybatch & 1]); 1583b24ab676SJeff Bonwick } 1584b24ab676SJeff Bonwick 1585fa9e4066Sahrens /* 1586fa9e4066Sahrens * Called in syncing context to free committed log blocks and update log header. 1587fa9e4066Sahrens */ 1588fa9e4066Sahrens void 1589fa9e4066Sahrens zil_sync(zilog_t *zilog, dmu_tx_t *tx) 1590fa9e4066Sahrens { 1591d80c45e0Sbonwick zil_header_t *zh = zil_header_in_syncing_context(zilog); 1592fa9e4066Sahrens uint64_t txg = dmu_tx_get_txg(tx); 1593fa9e4066Sahrens spa_t *spa = zilog->zl_spa; 1594b24ab676SJeff Bonwick uint64_t *replayed_seq = &zilog->zl_replayed_seq[txg & TXG_MASK]; 1595fa9e4066Sahrens lwb_t *lwb; 1596fa9e4066Sahrens 159714843421SMatthew Ahrens /* 159814843421SMatthew Ahrens * We don't zero out zl_destroy_txg, so make sure we don't try 159914843421SMatthew Ahrens * to destroy it twice. 160014843421SMatthew Ahrens */ 160114843421SMatthew Ahrens if (spa_sync_pass(spa) != 1) 160214843421SMatthew Ahrens return; 160314843421SMatthew Ahrens 1604d80c45e0Sbonwick mutex_enter(&zilog->zl_lock); 1605d80c45e0Sbonwick 1606fa9e4066Sahrens ASSERT(zilog->zl_stop_sync == 0); 1607fa9e4066Sahrens 1608b24ab676SJeff Bonwick if (*replayed_seq != 0) { 1609b24ab676SJeff Bonwick ASSERT(zh->zh_replay_seq < *replayed_seq); 1610b24ab676SJeff Bonwick zh->zh_replay_seq = *replayed_seq; 1611b24ab676SJeff Bonwick *replayed_seq = 0; 1612b24ab676SJeff Bonwick } 1613fa9e4066Sahrens 1614fa9e4066Sahrens if (zilog->zl_destroy_txg == txg) { 1615d80c45e0Sbonwick blkptr_t blk = zh->zh_log; 1616d80c45e0Sbonwick 1617d80c45e0Sbonwick ASSERT(list_head(&zilog->zl_lwb_list) == NULL); 1618d80c45e0Sbonwick 1619d80c45e0Sbonwick bzero(zh, sizeof (zil_header_t)); 16201209a471SNeil Perrin bzero(zilog->zl_replayed_seq, sizeof (zilog->zl_replayed_seq)); 1621d80c45e0Sbonwick 1622d80c45e0Sbonwick if (zilog->zl_keep_first) { 1623d80c45e0Sbonwick /* 1624d80c45e0Sbonwick * If this block was part of log chain that couldn't 1625d80c45e0Sbonwick * be claimed because a device was missing during 1626d80c45e0Sbonwick * zil_claim(), but that device later returns, 1627d80c45e0Sbonwick * then this block could erroneously appear valid. 1628d80c45e0Sbonwick * To guard against this, assign a new GUID to the new 1629d80c45e0Sbonwick * log chain so it doesn't matter what blk points to. 1630d80c45e0Sbonwick */ 1631d80c45e0Sbonwick zil_init_log_chain(zilog, &blk); 1632d80c45e0Sbonwick zh->zh_log = blk; 1633d80c45e0Sbonwick } 1634fa9e4066Sahrens } 1635fa9e4066Sahrens 1636e6ca193dSGeorge Wilson while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) { 1637b19a79ecSperrin zh->zh_log = lwb->lwb_blk; 1638fa9e4066Sahrens if (lwb->lwb_buf != NULL || lwb->lwb_max_txg > txg) 1639fa9e4066Sahrens break; 1640fa9e4066Sahrens list_remove(&zilog->zl_lwb_list, lwb); 1641b24ab676SJeff Bonwick zio_free_zil(spa, txg, &lwb->lwb_blk); 1642fa9e4066Sahrens kmem_cache_free(zil_lwb_cache, lwb); 1643d63d470bSgw 1644d63d470bSgw /* 1645d63d470bSgw * If we don't have anything left in the lwb list then 1646d63d470bSgw * we've had an allocation failure and we need to zero 1647d63d470bSgw * out the zil_header blkptr so that we don't end 1648d63d470bSgw * up freeing the same block twice. 1649d63d470bSgw */ 1650d63d470bSgw if (list_head(&zilog->zl_lwb_list) == NULL) 1651d63d470bSgw BP_ZERO(&zh->zh_log); 1652fa9e4066Sahrens } 1653fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 1654fa9e4066Sahrens } 1655fa9e4066Sahrens 1656fa9e4066Sahrens void 1657fa9e4066Sahrens zil_init(void) 1658fa9e4066Sahrens { 1659fa9e4066Sahrens zil_lwb_cache = kmem_cache_create("zil_lwb_cache", 16605ad82045Snd sizeof (struct lwb), 0, NULL, NULL, NULL, NULL, NULL, 0); 1661fa9e4066Sahrens } 1662fa9e4066Sahrens 1663fa9e4066Sahrens void 1664fa9e4066Sahrens zil_fini(void) 1665fa9e4066Sahrens { 1666fa9e4066Sahrens kmem_cache_destroy(zil_lwb_cache); 1667fa9e4066Sahrens } 1668fa9e4066Sahrens 166955da60b9SMark J Musante void 167055da60b9SMark J Musante zil_set_sync(zilog_t *zilog, uint64_t sync) 167155da60b9SMark J Musante { 167255da60b9SMark J Musante zilog->zl_sync = sync; 167355da60b9SMark J Musante } 167455da60b9SMark J Musante 1675e09fa4daSNeil Perrin void 1676e09fa4daSNeil Perrin zil_set_logbias(zilog_t *zilog, uint64_t logbias) 1677e09fa4daSNeil Perrin { 1678e09fa4daSNeil Perrin zilog->zl_logbias = logbias; 1679e09fa4daSNeil Perrin } 1680e09fa4daSNeil Perrin 1681fa9e4066Sahrens zilog_t * 1682fa9e4066Sahrens zil_alloc(objset_t *os, zil_header_t *zh_phys) 1683fa9e4066Sahrens { 1684fa9e4066Sahrens zilog_t *zilog; 1685fa9e4066Sahrens 1686fa9e4066Sahrens zilog = kmem_zalloc(sizeof (zilog_t), KM_SLEEP); 1687fa9e4066Sahrens 1688fa9e4066Sahrens zilog->zl_header = zh_phys; 1689fa9e4066Sahrens zilog->zl_os = os; 1690fa9e4066Sahrens zilog->zl_spa = dmu_objset_spa(os); 1691fa9e4066Sahrens zilog->zl_dmu_pool = dmu_objset_pool(os); 1692d80c45e0Sbonwick zilog->zl_destroy_txg = TXG_INITIAL - 1; 1693e09fa4daSNeil Perrin zilog->zl_logbias = dmu_objset_logbias(os); 169455da60b9SMark J Musante zilog->zl_sync = dmu_objset_syncprop(os); 16955002558fSNeil Perrin zilog->zl_next_batch = 1; 1696fa9e4066Sahrens 16975ad82045Snd mutex_init(&zilog->zl_lock, NULL, MUTEX_DEFAULT, NULL); 16985ad82045Snd 16995002558fSNeil Perrin for (int i = 0; i < TXG_SIZE; i++) { 17005002558fSNeil Perrin mutex_init(&zilog->zl_itxg[i].itxg_lock, NULL, 17015002558fSNeil Perrin MUTEX_DEFAULT, NULL); 17025002558fSNeil Perrin } 1703fa9e4066Sahrens 1704fa9e4066Sahrens list_create(&zilog->zl_lwb_list, sizeof (lwb_t), 1705fa9e4066Sahrens offsetof(lwb_t, lwb_node)); 1706fa9e4066Sahrens 17075002558fSNeil Perrin list_create(&zilog->zl_itx_commit_list, sizeof (itx_t), 17085002558fSNeil Perrin offsetof(itx_t, itx_node)); 17095002558fSNeil Perrin 171017f17c2dSbonwick mutex_init(&zilog->zl_vdev_lock, NULL, MUTEX_DEFAULT, NULL); 171117f17c2dSbonwick 171217f17c2dSbonwick avl_create(&zilog->zl_vdev_tree, zil_vdev_compare, 171317f17c2dSbonwick sizeof (zil_vdev_node_t), offsetof(zil_vdev_node_t, zv_node)); 1714fa9e4066Sahrens 1715b7b97454Sperrin cv_init(&zilog->zl_cv_writer, NULL, CV_DEFAULT, NULL); 1716b7b97454Sperrin cv_init(&zilog->zl_cv_suspend, NULL, CV_DEFAULT, NULL); 17175002558fSNeil Perrin cv_init(&zilog->zl_cv_batch[0], NULL, CV_DEFAULT, NULL); 17185002558fSNeil Perrin cv_init(&zilog->zl_cv_batch[1], NULL, CV_DEFAULT, NULL); 1719b7b97454Sperrin 1720fa9e4066Sahrens return (zilog); 1721fa9e4066Sahrens } 1722fa9e4066Sahrens 1723fa9e4066Sahrens void 1724fa9e4066Sahrens zil_free(zilog_t *zilog) 1725fa9e4066Sahrens { 1726fa9e4066Sahrens zilog->zl_stop_sync = 1; 1727fa9e4066Sahrens 17283b2aab18SMatthew Ahrens ASSERT0(zilog->zl_suspend); 17293b2aab18SMatthew Ahrens ASSERT0(zilog->zl_suspending); 17303b2aab18SMatthew Ahrens 1731c9ba2a43SEric Schrock ASSERT(list_is_empty(&zilog->zl_lwb_list)); 1732fa9e4066Sahrens list_destroy(&zilog->zl_lwb_list); 1733fa9e4066Sahrens 173417f17c2dSbonwick avl_destroy(&zilog->zl_vdev_tree); 173517f17c2dSbonwick mutex_destroy(&zilog->zl_vdev_lock); 1736fa9e4066Sahrens 17375002558fSNeil Perrin ASSERT(list_is_empty(&zilog->zl_itx_commit_list)); 17385002558fSNeil Perrin list_destroy(&zilog->zl_itx_commit_list); 17395002558fSNeil Perrin 17405002558fSNeil Perrin for (int i = 0; i < TXG_SIZE; i++) { 17415002558fSNeil Perrin /* 17425002558fSNeil Perrin * It's possible for an itx to be generated that doesn't dirty 17435002558fSNeil Perrin * a txg (e.g. ztest TX_TRUNCATE). So there's no zil_clean() 17445002558fSNeil Perrin * callback to remove the entry. We remove those here. 17455002558fSNeil Perrin * 17465002558fSNeil Perrin * Also free up the ziltest itxs. 17475002558fSNeil Perrin */ 17485002558fSNeil Perrin if (zilog->zl_itxg[i].itxg_itxs) 17495002558fSNeil Perrin zil_itxg_clean(zilog->zl_itxg[i].itxg_itxs); 17505002558fSNeil Perrin mutex_destroy(&zilog->zl_itxg[i].itxg_lock); 17515002558fSNeil Perrin } 17525002558fSNeil Perrin 17535ad82045Snd mutex_destroy(&zilog->zl_lock); 1754fa9e4066Sahrens 1755b7b97454Sperrin cv_destroy(&zilog->zl_cv_writer); 1756b7b97454Sperrin cv_destroy(&zilog->zl_cv_suspend); 17575002558fSNeil Perrin cv_destroy(&zilog->zl_cv_batch[0]); 17585002558fSNeil Perrin cv_destroy(&zilog->zl_cv_batch[1]); 1759b7b97454Sperrin 1760fa9e4066Sahrens kmem_free(zilog, sizeof (zilog_t)); 1761fa9e4066Sahrens } 1762fa9e4066Sahrens 1763fa9e4066Sahrens /* 1764fa9e4066Sahrens * Open an intent log. 1765fa9e4066Sahrens */ 1766fa9e4066Sahrens zilog_t * 1767fa9e4066Sahrens zil_open(objset_t *os, zil_get_data_t *get_data) 1768fa9e4066Sahrens { 1769fa9e4066Sahrens zilog_t *zilog = dmu_objset_zil(os); 1770fa9e4066Sahrens 1771c9ba2a43SEric Schrock ASSERT(zilog->zl_clean_taskq == NULL); 1772c9ba2a43SEric Schrock ASSERT(zilog->zl_get_data == NULL); 1773c9ba2a43SEric Schrock ASSERT(list_is_empty(&zilog->zl_lwb_list)); 1774c9ba2a43SEric Schrock 1775fa9e4066Sahrens zilog->zl_get_data = get_data; 1776fa9e4066Sahrens zilog->zl_clean_taskq = taskq_create("zil_clean", 1, minclsyspri, 1777fa9e4066Sahrens 2, 2, TASKQ_PREPOPULATE); 1778fa9e4066Sahrens 1779fa9e4066Sahrens return (zilog); 1780fa9e4066Sahrens } 1781fa9e4066Sahrens 1782fa9e4066Sahrens /* 1783fa9e4066Sahrens * Close an intent log. 1784fa9e4066Sahrens */ 1785fa9e4066Sahrens void 1786fa9e4066Sahrens zil_close(zilog_t *zilog) 1787fa9e4066Sahrens { 1788c9ba2a43SEric Schrock lwb_t *lwb; 17895002558fSNeil Perrin uint64_t txg = 0; 17905002558fSNeil Perrin 17915002558fSNeil Perrin zil_commit(zilog, 0); /* commit all itx */ 17925002558fSNeil Perrin 1793d80c45e0Sbonwick /* 17945002558fSNeil Perrin * The lwb_max_txg for the stubby lwb will reflect the last activity 17955002558fSNeil Perrin * for the zil. After a txg_wait_synced() on the txg we know all the 17965002558fSNeil Perrin * callbacks have occurred that may clean the zil. Only then can we 17975002558fSNeil Perrin * destroy the zl_clean_taskq. 1798d80c45e0Sbonwick */ 17995002558fSNeil Perrin mutex_enter(&zilog->zl_lock); 1800c9ba2a43SEric Schrock lwb = list_tail(&zilog->zl_lwb_list); 1801c9ba2a43SEric Schrock if (lwb != NULL) 1802c9ba2a43SEric Schrock txg = lwb->lwb_max_txg; 18035002558fSNeil Perrin mutex_exit(&zilog->zl_lock); 18045002558fSNeil Perrin if (txg) 1805d80c45e0Sbonwick txg_wait_synced(zilog->zl_dmu_pool, txg); 1806ce636f8bSMatthew Ahrens ASSERT(!zilog_is_dirty(zilog)); 1807d80c45e0Sbonwick 1808fa9e4066Sahrens taskq_destroy(zilog->zl_clean_taskq); 1809fa9e4066Sahrens zilog->zl_clean_taskq = NULL; 1810fa9e4066Sahrens zilog->zl_get_data = NULL; 1811c9ba2a43SEric Schrock 1812c9ba2a43SEric Schrock /* 1813c9ba2a43SEric Schrock * We should have only one LWB left on the list; remove it now. 1814c9ba2a43SEric Schrock */ 1815c9ba2a43SEric Schrock mutex_enter(&zilog->zl_lock); 1816c9ba2a43SEric Schrock lwb = list_head(&zilog->zl_lwb_list); 1817c9ba2a43SEric Schrock if (lwb != NULL) { 1818c9ba2a43SEric Schrock ASSERT(lwb == list_tail(&zilog->zl_lwb_list)); 1819c9ba2a43SEric Schrock list_remove(&zilog->zl_lwb_list, lwb); 1820c9ba2a43SEric Schrock zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); 1821c9ba2a43SEric Schrock kmem_cache_free(zil_lwb_cache, lwb); 1822c9ba2a43SEric Schrock } 1823c9ba2a43SEric Schrock mutex_exit(&zilog->zl_lock); 1824fa9e4066Sahrens } 1825fa9e4066Sahrens 18263b2aab18SMatthew Ahrens static char *suspend_tag = "zil suspending"; 18273b2aab18SMatthew Ahrens 1828fa9e4066Sahrens /* 1829fa9e4066Sahrens * Suspend an intent log. While in suspended mode, we still honor 1830fa9e4066Sahrens * synchronous semantics, but we rely on txg_wait_synced() to do it. 18313b2aab18SMatthew Ahrens * On old version pools, we suspend the log briefly when taking a 18323b2aab18SMatthew Ahrens * snapshot so that it will have an empty intent log. 18333b2aab18SMatthew Ahrens * 18343b2aab18SMatthew Ahrens * Long holds are not really intended to be used the way we do here -- 18353b2aab18SMatthew Ahrens * held for such a short time. A concurrent caller of dsl_dataset_long_held() 18363b2aab18SMatthew Ahrens * could fail. Therefore we take pains to only put a long hold if it is 18373b2aab18SMatthew Ahrens * actually necessary. Fortunately, it will only be necessary if the 18383b2aab18SMatthew Ahrens * objset is currently mounted (or the ZVOL equivalent). In that case it 18393b2aab18SMatthew Ahrens * will already have a long hold, so we are not really making things any worse. 18403b2aab18SMatthew Ahrens * 18413b2aab18SMatthew Ahrens * Ideally, we would locate the existing long-holder (i.e. the zfsvfs_t or 18423b2aab18SMatthew Ahrens * zvol_state_t), and use their mechanism to prevent their hold from being 18433b2aab18SMatthew Ahrens * dropped (e.g. VFS_HOLD()). However, that would be even more pain for 18443b2aab18SMatthew Ahrens * very little gain. 18453b2aab18SMatthew Ahrens * 18463b2aab18SMatthew Ahrens * if cookiep == NULL, this does both the suspend & resume. 18473b2aab18SMatthew Ahrens * Otherwise, it returns with the dataset "long held", and the cookie 18483b2aab18SMatthew Ahrens * should be passed into zil_resume(). 1849fa9e4066Sahrens */ 1850fa9e4066Sahrens int 18513b2aab18SMatthew Ahrens zil_suspend(const char *osname, void **cookiep) 1852fa9e4066Sahrens { 18533b2aab18SMatthew Ahrens objset_t *os; 18543b2aab18SMatthew Ahrens zilog_t *zilog; 18553b2aab18SMatthew Ahrens const zil_header_t *zh; 18563b2aab18SMatthew Ahrens int error; 18573b2aab18SMatthew Ahrens 18583b2aab18SMatthew Ahrens error = dmu_objset_hold(osname, suspend_tag, &os); 18593b2aab18SMatthew Ahrens if (error != 0) 18603b2aab18SMatthew Ahrens return (error); 18613b2aab18SMatthew Ahrens zilog = dmu_objset_zil(os); 1862fa9e4066Sahrens 1863fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 18643b2aab18SMatthew Ahrens zh = zilog->zl_header; 18653b2aab18SMatthew Ahrens 18663589c4f0SNeil Perrin if (zh->zh_flags & ZIL_REPLAY_NEEDED) { /* unplayed log */ 1867fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 18683b2aab18SMatthew Ahrens dmu_objset_rele(os, suspend_tag); 1869be6fd75aSMatthew Ahrens return (SET_ERROR(EBUSY)); 1870fa9e4066Sahrens } 18713b2aab18SMatthew Ahrens 18723b2aab18SMatthew Ahrens /* 18733b2aab18SMatthew Ahrens * Don't put a long hold in the cases where we can avoid it. This 18743b2aab18SMatthew Ahrens * is when there is no cookie so we are doing a suspend & resume 18753b2aab18SMatthew Ahrens * (i.e. called from zil_vdev_offline()), and there's nothing to do 18763b2aab18SMatthew Ahrens * for the suspend because it's already suspended, or there's no ZIL. 18773b2aab18SMatthew Ahrens */ 18783b2aab18SMatthew Ahrens if (cookiep == NULL && !zilog->zl_suspending && 18793b2aab18SMatthew Ahrens (zilog->zl_suspend > 0 || BP_IS_HOLE(&zh->zh_log))) { 18803b2aab18SMatthew Ahrens mutex_exit(&zilog->zl_lock); 18813b2aab18SMatthew Ahrens dmu_objset_rele(os, suspend_tag); 18823b2aab18SMatthew Ahrens return (0); 18833b2aab18SMatthew Ahrens } 18843b2aab18SMatthew Ahrens 18853b2aab18SMatthew Ahrens dsl_dataset_long_hold(dmu_objset_ds(os), suspend_tag); 18863b2aab18SMatthew Ahrens dsl_pool_rele(dmu_objset_pool(os), suspend_tag); 18873b2aab18SMatthew Ahrens 18883b2aab18SMatthew Ahrens zilog->zl_suspend++; 18893b2aab18SMatthew Ahrens 18903b2aab18SMatthew Ahrens if (zilog->zl_suspend > 1) { 1891d80c45e0Sbonwick /* 18923b2aab18SMatthew Ahrens * Someone else is already suspending it. 1893d80c45e0Sbonwick * Just wait for them to finish. 1894d80c45e0Sbonwick */ 18953b2aab18SMatthew Ahrens 1896d80c45e0Sbonwick while (zilog->zl_suspending) 1897d80c45e0Sbonwick cv_wait(&zilog->zl_cv_suspend, &zilog->zl_lock); 1898d80c45e0Sbonwick mutex_exit(&zilog->zl_lock); 18993b2aab18SMatthew Ahrens 19003b2aab18SMatthew Ahrens if (cookiep == NULL) 19013b2aab18SMatthew Ahrens zil_resume(os); 19023b2aab18SMatthew Ahrens else 19033b2aab18SMatthew Ahrens *cookiep = os; 19043b2aab18SMatthew Ahrens return (0); 19053b2aab18SMatthew Ahrens } 19063b2aab18SMatthew Ahrens 19073b2aab18SMatthew Ahrens /* 19083b2aab18SMatthew Ahrens * If there is no pointer to an on-disk block, this ZIL must not 19093b2aab18SMatthew Ahrens * be active (e.g. filesystem not mounted), so there's nothing 19103b2aab18SMatthew Ahrens * to clean up. 19113b2aab18SMatthew Ahrens */ 19123b2aab18SMatthew Ahrens if (BP_IS_HOLE(&zh->zh_log)) { 19133b2aab18SMatthew Ahrens ASSERT(cookiep != NULL); /* fast path already handled */ 19143b2aab18SMatthew Ahrens 19153b2aab18SMatthew Ahrens *cookiep = os; 19163b2aab18SMatthew Ahrens mutex_exit(&zilog->zl_lock); 1917d80c45e0Sbonwick return (0); 1918d80c45e0Sbonwick } 19193b2aab18SMatthew Ahrens 1920d80c45e0Sbonwick zilog->zl_suspending = B_TRUE; 1921fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 1922fa9e4066Sahrens 19235002558fSNeil Perrin zil_commit(zilog, 0); 1924fa9e4066Sahrens 1925d80c45e0Sbonwick zil_destroy(zilog, B_FALSE); 1926d80c45e0Sbonwick 1927d80c45e0Sbonwick mutex_enter(&zilog->zl_lock); 1928d80c45e0Sbonwick zilog->zl_suspending = B_FALSE; 1929d80c45e0Sbonwick cv_broadcast(&zilog->zl_cv_suspend); 1930d80c45e0Sbonwick mutex_exit(&zilog->zl_lock); 1931fa9e4066Sahrens 19323b2aab18SMatthew Ahrens if (cookiep == NULL) 19333b2aab18SMatthew Ahrens zil_resume(os); 19343b2aab18SMatthew Ahrens else 19353b2aab18SMatthew Ahrens *cookiep = os; 1936fa9e4066Sahrens return (0); 1937fa9e4066Sahrens } 1938fa9e4066Sahrens 1939fa9e4066Sahrens void 19403b2aab18SMatthew Ahrens zil_resume(void *cookie) 1941fa9e4066Sahrens { 19423b2aab18SMatthew Ahrens objset_t *os = cookie; 19433b2aab18SMatthew Ahrens zilog_t *zilog = dmu_objset_zil(os); 19443b2aab18SMatthew Ahrens 1945fa9e4066Sahrens mutex_enter(&zilog->zl_lock); 1946fa9e4066Sahrens ASSERT(zilog->zl_suspend != 0); 1947fa9e4066Sahrens zilog->zl_suspend--; 1948fa9e4066Sahrens mutex_exit(&zilog->zl_lock); 19493b2aab18SMatthew Ahrens dsl_dataset_long_rele(dmu_objset_ds(os), suspend_tag); 19503b2aab18SMatthew Ahrens dsl_dataset_rele(dmu_objset_ds(os), suspend_tag); 1951fa9e4066Sahrens } 1952fa9e4066Sahrens 1953fa9e4066Sahrens typedef struct zil_replay_arg { 1954fa9e4066Sahrens zil_replay_func_t **zr_replay; 1955fa9e4066Sahrens void *zr_arg; 1956fa9e4066Sahrens boolean_t zr_byteswap; 1957b24ab676SJeff Bonwick char *zr_lr; 1958fa9e4066Sahrens } zil_replay_arg_t; 1959fa9e4066Sahrens 1960b24ab676SJeff Bonwick static int 1961b24ab676SJeff Bonwick zil_replay_error(zilog_t *zilog, lr_t *lr, int error) 1962b24ab676SJeff Bonwick { 1963b24ab676SJeff Bonwick char name[MAXNAMELEN]; 1964b24ab676SJeff Bonwick 1965b24ab676SJeff Bonwick zilog->zl_replaying_seq--; /* didn't actually replay this one */ 1966b24ab676SJeff Bonwick 1967b24ab676SJeff Bonwick dmu_objset_name(zilog->zl_os, name); 1968b24ab676SJeff Bonwick 1969b24ab676SJeff Bonwick cmn_err(CE_WARN, "ZFS replay transaction error %d, " 1970b24ab676SJeff Bonwick "dataset %s, seq 0x%llx, txtype %llu %s\n", error, name, 1971b24ab676SJeff Bonwick (u_longlong_t)lr->lrc_seq, 1972b24ab676SJeff Bonwick (u_longlong_t)(lr->lrc_txtype & ~TX_CI), 1973b24ab676SJeff Bonwick (lr->lrc_txtype & TX_CI) ? "CI" : ""); 1974b24ab676SJeff Bonwick 1975b24ab676SJeff Bonwick return (error); 1976b24ab676SJeff Bonwick } 1977b24ab676SJeff Bonwick 1978b24ab676SJeff Bonwick static int 1979fa9e4066Sahrens zil_replay_log_record(zilog_t *zilog, lr_t *lr, void *zra, uint64_t claim_txg) 1980fa9e4066Sahrens { 1981fa9e4066Sahrens zil_replay_arg_t *zr = zra; 1982d80c45e0Sbonwick const zil_header_t *zh = zilog->zl_header; 1983fa9e4066Sahrens uint64_t reclen = lr->lrc_reclen; 1984fa9e4066Sahrens uint64_t txtype = lr->lrc_txtype; 1985b24ab676SJeff Bonwick int error = 0; 1986fa9e4066Sahrens 1987b24ab676SJeff Bonwick zilog->zl_replaying_seq = lr->lrc_seq; 1988fa9e4066Sahrens 1989fa9e4066Sahrens if (lr->lrc_seq <= zh->zh_replay_seq) /* already replayed */ 1990b24ab676SJeff Bonwick return (0); 1991b24ab676SJeff Bonwick 1992b24ab676SJeff Bonwick if (lr->lrc_txg < claim_txg) /* already committed */ 1993b24ab676SJeff Bonwick return (0); 1994fa9e4066Sahrens 1995da6c28aaSamw /* Strip case-insensitive bit, still present in log record */ 1996da6c28aaSamw txtype &= ~TX_CI; 1997da6c28aaSamw 1998b24ab676SJeff Bonwick if (txtype == 0 || txtype >= TX_MAX_TYPE) 1999b24ab676SJeff Bonwick return (zil_replay_error(zilog, lr, EINVAL)); 2000b24ab676SJeff Bonwick 2001b24ab676SJeff Bonwick /* 2002b24ab676SJeff Bonwick * If this record type can be logged out of order, the object 2003b24ab676SJeff Bonwick * (lr_foid) may no longer exist. That's legitimate, not an error. 2004b24ab676SJeff Bonwick */ 2005b24ab676SJeff Bonwick if (TX_OOO(txtype)) { 2006b24ab676SJeff Bonwick error = dmu_object_info(zilog->zl_os, 2007b24ab676SJeff Bonwick ((lr_ooo_t *)lr)->lr_foid, NULL); 2008b24ab676SJeff Bonwick if (error == ENOENT || error == EEXIST) 2009b24ab676SJeff Bonwick return (0); 20101209a471SNeil Perrin } 20111209a471SNeil Perrin 2012fa9e4066Sahrens /* 2013fa9e4066Sahrens * Make a copy of the data so we can revise and extend it. 2014fa9e4066Sahrens */ 2015b24ab676SJeff Bonwick bcopy(lr, zr->zr_lr, reclen); 2016b24ab676SJeff Bonwick 2017b24ab676SJeff Bonwick /* 2018b24ab676SJeff Bonwick * If this is a TX_WRITE with a blkptr, suck in the data. 2019b24ab676SJeff Bonwick */ 2020b24ab676SJeff Bonwick if (txtype == TX_WRITE && reclen == sizeof (lr_write_t)) { 2021b24ab676SJeff Bonwick error = zil_read_log_data(zilog, (lr_write_t *)lr, 2022b24ab676SJeff Bonwick zr->zr_lr + reclen); 20233b2aab18SMatthew Ahrens if (error != 0) 2024b24ab676SJeff Bonwick return (zil_replay_error(zilog, lr, error)); 2025b24ab676SJeff Bonwick } 2026fa9e4066Sahrens 2027fa9e4066Sahrens /* 2028fa9e4066Sahrens * The log block containing this lr may have been byteswapped 2029fa9e4066Sahrens * so that we can easily examine common fields like lrc_txtype. 2030b24ab676SJeff Bonwick * However, the log is a mix of different record types, and only the 2031fa9e4066Sahrens * replay vectors know how to byteswap their records. Therefore, if 2032fa9e4066Sahrens * the lr was byteswapped, undo it before invoking the replay vector. 2033fa9e4066Sahrens */ 2034fa9e4066Sahrens if (zr->zr_byteswap) 2035b24ab676SJeff Bonwick byteswap_uint64_array(zr->zr_lr, reclen); 2036fa9e4066Sahrens 2037fa9e4066Sahrens /* 2038fa9e4066Sahrens * We must now do two things atomically: replay this log record, 20391209a471SNeil Perrin * and update the log header sequence number to reflect the fact that 20401209a471SNeil Perrin * we did so. At the end of each replay function the sequence number 20411209a471SNeil Perrin * is updated if we are in replay mode. 2042fa9e4066Sahrens */ 2043b24ab676SJeff Bonwick error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lr, zr->zr_byteswap); 20443b2aab18SMatthew Ahrens if (error != 0) { 204567bd71c6Sperrin /* 204667bd71c6Sperrin * The DMU's dnode layer doesn't see removes until the txg 204767bd71c6Sperrin * commits, so a subsequent claim can spuriously fail with 20481209a471SNeil Perrin * EEXIST. So if we receive any error we try syncing out 2049b24ab676SJeff Bonwick * any removes then retry the transaction. Note that we 2050b24ab676SJeff Bonwick * specify B_FALSE for byteswap now, so we don't do it twice. 205167bd71c6Sperrin */ 2052b24ab676SJeff Bonwick txg_wait_synced(spa_get_dsl(zilog->zl_spa), 0); 2053b24ab676SJeff Bonwick error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lr, B_FALSE); 20543b2aab18SMatthew Ahrens if (error != 0) 2055b24ab676SJeff Bonwick return (zil_replay_error(zilog, lr, error)); 2056fa9e4066Sahrens } 2057b24ab676SJeff Bonwick return (0); 205867bd71c6Sperrin } 2059fa9e4066Sahrens 206067bd71c6Sperrin /* ARGSUSED */ 2061b24ab676SJeff Bonwick static int 206267bd71c6Sperrin zil_incr_blks(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) 206367bd71c6Sperrin { 206467bd71c6Sperrin zilog->zl_replay_blks++; 2065b24ab676SJeff Bonwick 2066b24ab676SJeff Bonwick return (0); 2067fa9e4066Sahrens } 2068fa9e4066Sahrens 2069fa9e4066Sahrens /* 207013f5297eSperrin * If this dataset has a non-empty intent log, replay it and destroy it. 2071fa9e4066Sahrens */ 2072fa9e4066Sahrens void 20731209a471SNeil Perrin zil_replay(objset_t *os, void *arg, zil_replay_func_t *replay_func[TX_MAX_TYPE]) 2074fa9e4066Sahrens { 2075fa9e4066Sahrens zilog_t *zilog = dmu_objset_zil(os); 2076d80c45e0Sbonwick const zil_header_t *zh = zilog->zl_header; 2077d80c45e0Sbonwick zil_replay_arg_t zr; 207813f5297eSperrin 20793589c4f0SNeil Perrin if ((zh->zh_flags & ZIL_REPLAY_NEEDED) == 0) { 2080d80c45e0Sbonwick zil_destroy(zilog, B_TRUE); 208113f5297eSperrin return; 208213f5297eSperrin } 2083fa9e4066Sahrens 2084fa9e4066Sahrens zr.zr_replay = replay_func; 2085fa9e4066Sahrens zr.zr_arg = arg; 2086d80c45e0Sbonwick zr.zr_byteswap = BP_SHOULD_BYTESWAP(&zh->zh_log); 2087b24ab676SJeff Bonwick zr.zr_lr = kmem_alloc(2 * SPA_MAXBLOCKSIZE, KM_SLEEP); 2088fa9e4066Sahrens 2089fa9e4066Sahrens /* 2090fa9e4066Sahrens * Wait for in-progress removes to sync before starting replay. 2091fa9e4066Sahrens */ 2092fa9e4066Sahrens txg_wait_synced(zilog->zl_dmu_pool, 0); 2093fa9e4066Sahrens 20941209a471SNeil Perrin zilog->zl_replay = B_TRUE; 2095d3d50737SRafael Vanoni zilog->zl_replay_time = ddi_get_lbolt(); 209667bd71c6Sperrin ASSERT(zilog->zl_replay_blks == 0); 209767bd71c6Sperrin (void) zil_parse(zilog, zil_incr_blks, zil_replay_log_record, &zr, 2098d80c45e0Sbonwick zh->zh_claim_txg); 2099b24ab676SJeff Bonwick kmem_free(zr.zr_lr, 2 * SPA_MAXBLOCKSIZE); 2100fa9e4066Sahrens 2101d80c45e0Sbonwick zil_destroy(zilog, B_FALSE); 2102a4611edeSahrens txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); 21031209a471SNeil Perrin zilog->zl_replay = B_FALSE; 2104fa9e4066Sahrens } 2105436b2950Sperrin 2106b24ab676SJeff Bonwick boolean_t 2107b24ab676SJeff Bonwick zil_replaying(zilog_t *zilog, dmu_tx_t *tx) 2108436b2950Sperrin { 210955da60b9SMark J Musante if (zilog->zl_sync == ZFS_SYNC_DISABLED) 2110b24ab676SJeff Bonwick return (B_TRUE); 2111436b2950Sperrin 2112b24ab676SJeff Bonwick if (zilog->zl_replay) { 2113b24ab676SJeff Bonwick dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 2114b24ab676SJeff Bonwick zilog->zl_replayed_seq[dmu_tx_get_txg(tx) & TXG_MASK] = 2115b24ab676SJeff Bonwick zilog->zl_replaying_seq; 2116b24ab676SJeff Bonwick return (B_TRUE); 2117b19a79ecSperrin } 2118b19a79ecSperrin 2119b24ab676SJeff Bonwick return (B_FALSE); 2120436b2950Sperrin } 2121e6ca193dSGeorge Wilson 2122e6ca193dSGeorge Wilson /* ARGSUSED */ 2123e6ca193dSGeorge Wilson int 2124fd136879SMatthew Ahrens zil_vdev_offline(const char *osname, void *arg) 2125e6ca193dSGeorge Wilson { 2126e6ca193dSGeorge Wilson int error; 2127e6ca193dSGeorge Wilson 21283b2aab18SMatthew Ahrens error = zil_suspend(osname, NULL); 21293b2aab18SMatthew Ahrens if (error != 0) 2130be6fd75aSMatthew Ahrens return (SET_ERROR(EEXIST)); 21313b2aab18SMatthew Ahrens return (0); 2132e6ca193dSGeorge Wilson } 2133