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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _SYS_ZIL_IMPL_H 28 #define _SYS_ZIL_IMPL_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include <sys/zil.h> 33 #include <sys/dmu_objset.h> 34 35 #ifdef __cplusplus 36 extern "C" { 37 #endif 38 39 typedef enum lwb_state_type { 40 UNWRITTEN, /* buffer yet to be written */ 41 SEQ_INCOMPLETE, /* buffer written, but there's an unwritten buffer in */ 42 /* the sequence before this */ 43 SEQ_COMPLETE, /* no unwritten buffers before this */ 44 } lwb_state_t; 45 46 /* 47 * Log write buffer. 48 */ 49 typedef struct lwb { 50 zilog_t *lwb_zilog; /* back pointer to log struct */ 51 blkptr_t lwb_blk; /* on disk address of this log blk */ 52 int lwb_nused; /* # used bytes in buffer */ 53 int lwb_sz; /* size of block and buffer */ 54 char *lwb_buf; /* log write buffer */ 55 uint64_t lwb_max_txg; /* highest txg in this lwb */ 56 uint64_t lwb_seq; /* highest log record seq number */ 57 txg_handle_t lwb_txgh; /* txg handle for txg_exit() */ 58 list_node_t lwb_node; /* zilog->zl_lwb_list linkage */ 59 lwb_state_t lwb_state; /* buffer state */ 60 } lwb_t; 61 62 /* 63 * [vdev, seq] element for use in flushing device write caches 64 */ 65 typedef struct zil_vdev { 66 uint64_t vdev; /* device written */ 67 uint64_t seq; /* itx sequence */ 68 list_node_t vdev_seq_node; /* zilog->zl_vdev_list linkage */ 69 } zil_vdev_t; 70 71 /* 72 * Stable storage intent log management structure. One per dataset. 73 */ 74 struct zilog { 75 kmutex_t zl_lock; /* protects most zilog_t fields */ 76 struct dsl_pool *zl_dmu_pool; /* DSL pool */ 77 spa_t *zl_spa; /* handle for read/write log */ 78 zil_header_t *zl_header; /* log header buffer */ 79 objset_t *zl_os; /* object set we're logging */ 80 zil_get_data_t *zl_get_data; /* callback to get object content */ 81 uint64_t zl_itx_seq; /* itx sequence number */ 82 uint64_t zl_ss_seq; /* last tx on stable storage */ 83 uint64_t zl_destroy_txg; /* txg of last zil_destroy() */ 84 uint64_t zl_replay_seq[TXG_SIZE]; /* seq of last replayed rec */ 85 uint32_t zl_suspend; /* log suspend count */ 86 kcondvar_t zl_cv_write; /* for waiting to write to log */ 87 kcondvar_t zl_cv_seq; /* for committing a sequence */ 88 uint8_t zl_stop_replay; /* don't replay any further */ 89 uint8_t zl_stop_sync; /* for debugging */ 90 uint8_t zl_writer; /* boolean: write setup in progress */ 91 uint8_t zl_log_error; /* boolean: log write error */ 92 list_t zl_itx_list; /* in-memory itx list */ 93 uint64_t zl_itx_list_sz; /* total size of records on list */ 94 uint64_t zl_cur_used; /* current commit log size used */ 95 uint64_t zl_prev_used; /* previous commit log size used */ 96 list_t zl_lwb_list; /* in-flight log write list */ 97 list_t zl_vdev_list; /* list of [vdev, seq] pairs */ 98 taskq_t *zl_clean_taskq; /* runs lwb and itx clean tasks */ 99 avl_tree_t zl_dva_tree; /* track DVAs during log parse */ 100 kmutex_t zl_destroy_lock; /* serializes zil_destroy() calls */ 101 }; 102 103 typedef struct zil_dva_node { 104 dva_t zn_dva; 105 avl_node_t zn_node; 106 } zil_dva_node_t; 107 108 #ifdef __cplusplus 109 } 110 #endif 111 112 #endif /* _SYS_ZIL_IMPL_H */ 113