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 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_ZIL_IMPL_H 27 #define _SYS_ZIL_IMPL_H 28 29 #include <sys/zil.h> 30 #include <sys/dmu_objset.h> 31 32 #ifdef __cplusplus 33 extern "C" { 34 #endif 35 36 /* 37 * Log write buffer. 38 */ 39 typedef struct lwb { 40 zilog_t *lwb_zilog; /* back pointer to log struct */ 41 blkptr_t lwb_blk; /* on disk address of this log blk */ 42 int lwb_nused; /* # used bytes in buffer */ 43 int lwb_sz; /* size of block and buffer */ 44 char *lwb_buf; /* log write buffer */ 45 zio_t *lwb_zio; /* zio for this buffer */ 46 uint64_t lwb_max_txg; /* highest txg in this lwb */ 47 txg_handle_t lwb_txgh; /* txg handle for txg_exit() */ 48 list_node_t lwb_node; /* zilog->zl_lwb_list linkage */ 49 } lwb_t; 50 51 /* 52 * Vdev flushing: during a zil_commit(), we build up an AVL tree of the vdevs 53 * we've touched so we know which ones need a write cache flush at the end. 54 */ 55 typedef struct zil_vdev_node { 56 uint64_t zv_vdev; /* vdev to be flushed */ 57 avl_node_t zv_node; /* AVL tree linkage */ 58 } zil_vdev_node_t; 59 60 /* 61 * Stable storage intent log management structure. One per dataset. 62 */ 63 struct zilog { 64 kmutex_t zl_lock; /* protects most zilog_t fields */ 65 struct dsl_pool *zl_dmu_pool; /* DSL pool */ 66 spa_t *zl_spa; /* handle for read/write log */ 67 const zil_header_t *zl_header; /* log header buffer */ 68 objset_t *zl_os; /* object set we're logging */ 69 zil_get_data_t *zl_get_data; /* callback to get object content */ 70 zio_t *zl_root_zio; /* log writer root zio */ 71 uint64_t zl_itx_seq; /* next itx sequence number */ 72 uint64_t zl_commit_seq; /* committed upto this number */ 73 uint64_t zl_lr_seq; /* log record sequence number */ 74 uint64_t zl_destroy_txg; /* txg of last zil_destroy() */ 75 uint64_t zl_replayed_seq[TXG_SIZE]; /* last replayed rec seq */ 76 uint64_t zl_replaying_seq; /* current replay seq number */ 77 uint32_t zl_suspend; /* log suspend count */ 78 kcondvar_t zl_cv_writer; /* log writer thread completion */ 79 kcondvar_t zl_cv_suspend; /* log suspend completion */ 80 uint8_t zl_suspending; /* log is currently suspending */ 81 uint8_t zl_keep_first; /* keep first log block in destroy */ 82 uint8_t zl_replay; /* replaying records while set */ 83 uint8_t zl_stop_sync; /* for debugging */ 84 uint8_t zl_writer; /* boolean: write setup in progress */ 85 uint8_t zl_log_error; /* boolean: log write error */ 86 uint8_t zl_logbias; /* latency or throughput */ 87 list_t zl_itx_list; /* in-memory itx list */ 88 uint64_t zl_itx_list_sz; /* total size of records on list */ 89 uint64_t zl_cur_used; /* current commit log size used */ 90 uint64_t zl_prev_used; /* previous commit log size used */ 91 list_t zl_lwb_list; /* in-flight log write list */ 92 kmutex_t zl_vdev_lock; /* protects zl_vdev_tree */ 93 avl_tree_t zl_vdev_tree; /* vdevs to flush in zil_commit() */ 94 taskq_t *zl_clean_taskq; /* runs lwb and itx clean tasks */ 95 avl_tree_t zl_dva_tree; /* track DVAs during log parse */ 96 clock_t zl_replay_time; /* lbolt of when replay started */ 97 uint64_t zl_replay_blks; /* number of log blocks replayed */ 98 }; 99 100 typedef struct zil_dva_node { 101 dva_t zn_dva; 102 avl_node_t zn_node; 103 } zil_dva_node_t; 104 105 #define ZIL_MAX_LOG_DATA (SPA_MAXBLOCKSIZE - sizeof (zil_trailer_t) - \ 106 sizeof (lr_write_t)) 107 108 #ifdef __cplusplus 109 } 110 #endif 111 112 #endif /* _SYS_ZIL_IMPL_H */ 113