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 2006 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 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include <sys/zil.h> 32 #include <sys/dmu_objset.h> 33 34 #ifdef __cplusplus 35 extern "C" { 36 #endif 37 38 typedef enum lwb_state_type { 39 UNWRITTEN, /* buffer yet to be written */ 40 SEQ_INCOMPLETE, /* buffer written, but there's an unwritten buffer in */ 41 /* the sequence before this */ 42 SEQ_COMPLETE, /* no unwritten buffers before this */ 43 } lwb_state_t; 44 45 /* 46 * Log write buffer. 47 */ 48 typedef struct lwb { 49 zilog_t *lwb_zilog; /* back pointer to log struct */ 50 blkptr_t lwb_blk; /* on disk address of this log blk */ 51 int lwb_nused; /* # used bytes in buffer */ 52 int lwb_sz; /* size of block and buffer */ 53 char *lwb_buf; /* log write buffer */ 54 uint64_t lwb_max_txg; /* highest txg in this lwb */ 55 uint64_t lwb_seq; /* highest log record seq number */ 56 txg_handle_t lwb_txgh; /* txg handle for txg_exit() */ 57 list_node_t lwb_node; /* zilog->zl_lwb_list linkage */ 58 lwb_state_t lwb_state; /* buffer state */ 59 } lwb_t; 60 61 /* 62 * [vdev, seq] element for use in flushing device write caches 63 */ 64 typedef struct zil_vdev { 65 uint64_t vdev; /* device written */ 66 uint64_t seq; /* itx sequence */ 67 list_node_t vdev_seq_node; /* zilog->zl_vdev_list linkage */ 68 } zil_vdev_t; 69 70 /* 71 * Stable storage intent log management structure. One per dataset. 72 */ 73 struct zilog { 74 kmutex_t zl_lock; /* protects most zilog_t fields */ 75 struct dsl_pool *zl_dmu_pool; /* DSL pool */ 76 spa_t *zl_spa; /* handle for read/write log */ 77 const zil_header_t *zl_header; /* log header buffer */ 78 objset_t *zl_os; /* object set we're logging */ 79 zil_get_data_t *zl_get_data; /* callback to get object content */ 80 uint64_t zl_itx_seq; /* itx sequence number */ 81 uint64_t zl_ss_seq; /* last tx on stable storage */ 82 uint64_t zl_destroy_txg; /* txg of last zil_destroy() */ 83 uint64_t zl_replay_seq[TXG_SIZE]; /* seq of last replayed rec */ 84 uint32_t zl_suspend; /* log suspend count */ 85 kcondvar_t zl_cv_write; /* for waiting to write to log */ 86 kcondvar_t zl_cv_seq; /* for committing a sequence */ 87 kcondvar_t zl_cv_suspend; /* log suspend completion */ 88 uint8_t zl_suspending; /* log is currently suspending */ 89 uint8_t zl_keep_first; /* keep first log block in destroy */ 90 uint8_t zl_stop_replay; /* don't replay any further */ 91 uint8_t zl_stop_sync; /* for debugging */ 92 uint8_t zl_writer; /* boolean: write setup in progress */ 93 uint8_t zl_log_error; /* boolean: log write error */ 94 list_t zl_itx_list; /* in-memory itx list */ 95 uint64_t zl_itx_list_sz; /* total size of records on list */ 96 uint64_t zl_cur_used; /* current commit log size used */ 97 uint64_t zl_prev_used; /* previous commit log size used */ 98 list_t zl_lwb_list; /* in-flight log write list */ 99 list_t zl_vdev_list; /* list of [vdev, seq] pairs */ 100 taskq_t *zl_clean_taskq; /* runs lwb and itx clean tasks */ 101 avl_tree_t zl_dva_tree; /* track DVAs during log parse */ 102 }; 103 104 typedef struct zil_dva_node { 105 dva_t zn_dva; 106 avl_node_t zn_node; 107 } zil_dva_node_t; 108 109 #ifdef __cplusplus 110 } 111 #endif 112 113 #endif /* _SYS_ZIL_IMPL_H */ 114