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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 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 	dmu_tx_t	*lwb_tx;	/* tx for log block allocation */
     47 	uint64_t	lwb_max_txg;	/* highest txg in this lwb */
     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 in-core itx sequence number */
     72 	uint64_t	zl_lr_seq;	/* on-disk log record sequence number */
     73 	uint64_t	zl_commit_seq;	/* committed upto this number */
     74 	uint64_t	zl_commit_lr_seq; /* last committed on-disk lr seq */
     75 	uint64_t	zl_destroy_txg;	/* txg of last zil_destroy() */
     76 	uint64_t	zl_replayed_seq[TXG_SIZE]; /* last replayed rec seq */
     77 	uint64_t	zl_replaying_seq; /* current replay seq number */
     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_replay;	/* replaying records while set */
     84 	uint8_t		zl_stop_sync;	/* for debugging */
     85 	uint8_t		zl_writer;	/* boolean: write setup in progress */
     86 	uint8_t		zl_logbias;	/* latency or throughput */
     87 	int		zl_parse_error;	/* last zil_parse() error */
     88 	uint64_t	zl_parse_blk_seq; /* highest blk seq on last parse */
     89 	uint64_t	zl_parse_lr_seq; /* highest lr seq on last parse */
     90 	uint64_t	zl_parse_blk_count; /* number of blocks parsed */
     91 	uint64_t	zl_parse_lr_count; /* number of log records parsed */
     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 	kmutex_t	zl_vdev_lock;	/* protects zl_vdev_tree */
     98 	avl_tree_t	zl_vdev_tree;	/* vdevs to flush in zil_commit() */
     99 	taskq_t		*zl_clean_taskq; /* runs lwb and itx clean tasks */
    100 	avl_tree_t	zl_bp_tree;	/* track bps during log parse */
    101 	clock_t		zl_replay_time;	/* lbolt of when replay started */
    102 	uint64_t	zl_replay_blks;	/* number of log blocks replayed */
    103 	zil_header_t	zl_old_header;	/* debugging aid */
    104 };
    105 
    106 typedef struct zil_bp_node {
    107 	dva_t		zn_dva;
    108 	avl_node_t	zn_node;
    109 } zil_bp_node_t;
    110 
    111 #define	ZIL_MAX_LOG_DATA (SPA_MAXBLOCKSIZE - sizeof (zil_trailer_t) - \
    112     sizeof (lr_write_t))
    113 
    114 #ifdef	__cplusplus
    115 }
    116 #endif
    117 
    118 #endif	/* _SYS_ZIL_IMPL_H */
    119