1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 25 /* Portions Copyright 2010 Robert Milkowski */ 26 27 #ifndef _SYS_ZIL_IMPL_H 28 #define _SYS_ZIL_IMPL_H 29 30 #include <sys/zil.h> 31 #include <sys/dmu_objset.h> 32 33 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 /* 38 * Log write buffer. 39 */ 40 typedef struct lwb { 41 zilog_t *lwb_zilog; /* back pointer to log struct */ 42 blkptr_t lwb_blk; /* on disk address of this log blk */ 43 int lwb_nused; /* # used bytes in buffer */ 44 int lwb_sz; /* size of block and buffer */ 45 char *lwb_buf; /* log write buffer */ 46 zio_t *lwb_zio; /* zio for this buffer */ 47 dmu_tx_t *lwb_tx; /* tx for log block allocation */ 48 uint64_t lwb_max_txg; /* highest txg in this lwb */ 49 list_node_t lwb_node; /* zilog->zl_lwb_list linkage */ 50 } lwb_t; 51 52 /* 53 * Vdev flushing: during a zil_commit(), we build up an AVL tree of the vdevs 54 * we've touched so we know which ones need a write cache flush at the end. 55 */ 56 typedef struct zil_vdev_node { 57 uint64_t zv_vdev; /* vdev to be flushed */ 58 avl_node_t zv_node; /* AVL tree linkage */ 59 } zil_vdev_node_t; 60 61 #define ZIL_PREV_BLKS 16 62 63 /* 64 * Stable storage intent log management structure. One per dataset. 65 */ 66 struct zilog { 67 kmutex_t zl_lock; /* protects most zilog_t fields */ 68 struct dsl_pool *zl_dmu_pool; /* DSL pool */ 69 spa_t *zl_spa; /* handle for read/write log */ 70 const zil_header_t *zl_header; /* log header buffer */ 71 objset_t *zl_os; /* object set we're logging */ 72 zil_get_data_t *zl_get_data; /* callback to get object content */ 73 zio_t *zl_root_zio; /* log writer root zio */ 74 uint64_t zl_itx_seq; /* next in-core itx sequence number */ 75 uint64_t zl_lr_seq; /* on-disk log record sequence number */ 76 uint64_t zl_commit_seq; /* committed upto this number */ 77 uint64_t zl_commit_lr_seq; /* last committed on-disk lr seq */ 78 uint64_t zl_destroy_txg; /* txg of last zil_destroy() */ 79 uint64_t zl_replayed_seq[TXG_SIZE]; /* last replayed rec seq */ 80 uint64_t zl_replaying_seq; /* current replay seq number */ 81 uint32_t zl_suspend; /* log suspend count */ 82 kcondvar_t zl_cv_writer; /* log writer thread completion */ 83 kcondvar_t zl_cv_suspend; /* log suspend completion */ 84 uint8_t zl_suspending; /* log is currently suspending */ 85 uint8_t zl_keep_first; /* keep first log block in destroy */ 86 uint8_t zl_replay; /* replaying records while set */ 87 uint8_t zl_stop_sync; /* for debugging */ 88 uint8_t zl_writer; /* boolean: write setup in progress */ 89 uint8_t zl_logbias; /* latency or throughput */ 90 uint8_t zl_sync; /* synchronous or asynchronous */ 91 int zl_parse_error; /* last zil_parse() error */ 92 uint64_t zl_parse_blk_seq; /* highest blk seq on last parse */ 93 uint64_t zl_parse_lr_seq; /* highest lr seq on last parse */ 94 uint64_t zl_parse_blk_count; /* number of blocks parsed */ 95 uint64_t zl_parse_lr_count; /* number of log records parsed */ 96 list_t zl_itx_list; /* in-memory itx list */ 97 uint64_t zl_itx_list_sz; /* total size of records on list */ 98 uint64_t zl_cur_used; /* current commit log size used */ 99 uint64_t zl_prev_used; /* previous commit log size used */ 100 list_t zl_lwb_list; /* in-flight log write list */ 101 kmutex_t zl_vdev_lock; /* protects zl_vdev_tree */ 102 avl_tree_t zl_vdev_tree; /* vdevs to flush in zil_commit() */ 103 taskq_t *zl_clean_taskq; /* runs lwb and itx clean tasks */ 104 avl_tree_t zl_bp_tree; /* track bps during log parse */ 105 clock_t zl_replay_time; /* lbolt of when replay started */ 106 uint64_t zl_replay_blks; /* number of log blocks replayed */ 107 zil_header_t zl_old_header; /* debugging aid */ 108 uint_t zl_prev_blks[ZIL_PREV_BLKS]; /* size - sector rounded */ 109 uint_t zl_prev_rotor; /* rotor for zl_prev[] */ 110 }; 111 112 typedef struct zil_bp_node { 113 dva_t zn_dva; 114 avl_node_t zn_node; 115 } zil_bp_node_t; 116 117 #define ZIL_MAX_LOG_DATA (SPA_MAXBLOCKSIZE - sizeof (zil_chain_t) - \ 118 sizeof (lr_write_t)) 119 120 #ifdef __cplusplus 121 } 122 #endif 123 124 #endif /* _SYS_ZIL_IMPL_H */ 125