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      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 2007 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	"@(#)zil_impl.h	1.7	07/12/12 SMI"
     30 
     31 #include <sys/zil.h>
     32 #include <sys/dmu_objset.h>
     33 
     34 #ifdef	__cplusplus
     35 extern "C" {
     36 #endif
     37 
     38 /*
     39  * Log write buffer.
     40  */
     41 typedef struct lwb {
     42 	zilog_t		*lwb_zilog;	/* back pointer to log struct */
     43 	blkptr_t	lwb_blk;	/* on disk address of this log blk */
     44 	int		lwb_nused;	/* # used bytes in buffer */
     45 	int		lwb_sz;		/* size of block and buffer */
     46 	char		*lwb_buf;	/* log write buffer */
     47 	zio_t		*lwb_zio;	/* zio for this buffer */
     48 	uint64_t	lwb_max_txg;	/* highest txg in this lwb */
     49 	txg_handle_t	lwb_txgh;	/* txg handle for txg_exit() */
     50 	list_node_t	lwb_node;	/* zilog->zl_lwb_list linkage */
     51 } lwb_t;
     52 
     53 /*
     54  * Vdev flushing: during a zil_commit(), we build up an AVL tree of the vdevs
     55  * we've touched so we know which ones need a write cache flush at the end.
     56  */
     57 typedef struct zil_vdev_node {
     58 	uint64_t	zv_vdev;	/* vdev to be flushed */
     59 	avl_node_t	zv_node;	/* AVL tree linkage */
     60 } zil_vdev_node_t;
     61 
     62 /*
     63  * Stable storage intent log management structure.  One per dataset.
     64  */
     65 struct zilog {
     66 	kmutex_t	zl_lock;	/* protects most zilog_t fields */
     67 	struct dsl_pool	*zl_dmu_pool;	/* DSL pool */
     68 	spa_t		*zl_spa;	/* handle for read/write log */
     69 	const zil_header_t *zl_header;	/* log header buffer */
     70 	objset_t	*zl_os;		/* object set we're logging */
     71 	zil_get_data_t	*zl_get_data;	/* callback to get object content */
     72 	zio_t		*zl_root_zio;	/* log writer root zio */
     73 	uint64_t	zl_itx_seq;	/* next itx sequence number */
     74 	uint64_t	zl_commit_seq;	/* committed upto this number */
     75 	uint64_t	zl_lr_seq;	/* log record sequence number */
     76 	uint64_t	zl_destroy_txg;	/* txg of last zil_destroy() */
     77 	uint64_t	zl_replay_seq[TXG_SIZE]; /* seq of last replayed rec */
     78 	uint32_t	zl_suspend;	/* log suspend count */
     79 	kcondvar_t	zl_cv_writer;	/* log writer thread completion */
     80 	kcondvar_t	zl_cv_suspend;	/* log suspend completion */
     81 	uint8_t		zl_suspending;	/* log is currently suspending */
     82 	uint8_t		zl_keep_first;	/* keep first log block in destroy */
     83 	uint8_t		zl_stop_replay;	/* don't replay any further */
     84 	uint8_t		zl_stop_sync;	/* for debugging */
     85 	uint8_t		zl_writer;	/* boolean: write setup in progress */
     86 	uint8_t		zl_log_error;	/* boolean: log write error */
     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 #ifdef	__cplusplus
    106 }
    107 #endif
    108 
    109 #endif	/* _SYS_ZIL_IMPL_H */
    110