zil_impl.h revision fa9e4066f08beec538e775443c5be79dd423fcab
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_ZIL_IMPL_H
#define _SYS_ZIL_IMPL_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/zil.h>
#include <sys/dmu_objset.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef enum lwb_state_type {
UNWRITTEN, /* buffer yet to be written */
SEQ_INCOMPLETE, /* buffer written, but there's an unwritten buffer in */
/* the sequence before this */
SEQ_COMPLETE, /* no unwritten buffers before this */
} lwb_state_t;
/*
* Log write buffer.
*/
typedef struct lwb {
zilog_t *lwb_zilog; /* back pointer to log struct */
blkptr_t lwb_blk; /* on disk address of this log blk */
int lwb_nused; /* # used bytes in buffer */
int lwb_sz; /* size of block and buffer */
char *lwb_buf; /* log write buffer */
uint64_t lwb_max_txg; /* highest txg in this lwb */
uint64_t lwb_seq; /* highest log record seq number */
txg_handle_t lwb_txgh; /* txg handle for txg_exit() */
list_node_t lwb_node; /* zilog->zl_lwb_list linkage */
lwb_state_t lwb_state; /* buffer state */
} lwb_t;
/*
* [vdev, seq] element for use in flushing device write caches
*/
typedef struct zil_vdev {
uint64_t vdev; /* device written */
uint64_t seq; /* itx sequence */
list_node_t vdev_seq_node; /* zilog->zl_vdev_list linkage */
} zil_vdev_t;
/*
* Stable storage intent log management structure. One per dataset.
*/
struct zilog {
kmutex_t zl_lock; /* protects most zilog_t fields */
struct dsl_pool *zl_dmu_pool; /* DSL pool */
spa_t *zl_spa; /* handle for read/write log */
zil_header_t *zl_header; /* log header buffer */
objset_t *zl_os; /* object set we're logging */
zil_get_data_t *zl_get_data; /* callback to get object content */
uint64_t zl_itx_seq; /* itx sequence number */
uint64_t zl_ss_seq; /* last tx on stable storage */
uint64_t zl_destroy_txg; /* txg of last zil_destroy() */
uint64_t zl_replay_seq[TXG_SIZE]; /* seq of last replayed rec */
uint32_t zl_suspend; /* log suspend count */
kcondvar_t zl_cv_write; /* for waiting to write to log */
kcondvar_t zl_cv_seq; /* for committing a sequence */
uint8_t zl_stop_replay; /* don't replay any further */
uint8_t zl_stop_sync; /* for debugging */
uint8_t zl_writer; /* boolean: write setup in progress */
uint8_t zl_log_error; /* boolean: log write error */
list_t zl_itx_list; /* in-memory itx list */
uint64_t zl_itx_list_sz; /* total size of records on list */
uint64_t zl_prev_blk_sz; /* previous log block size */
list_t zl_lwb_list; /* in-flight log write list */
list_t zl_vdev_list; /* list of [vdev, seq] pairs */
taskq_t *zl_clean_taskq; /* runs lwb and itx clean tasks */
avl_tree_t zl_dva_tree; /* track DVAs during log parse */
kmutex_t zl_destroy_lock; /* serializes zil_destroy() calls */
};
typedef struct zil_dva_node {
dva_t zn_dva;
avl_node_t zn_node;
} zil_dva_node_t;
#ifdef __cplusplus
}
#endif
#endif /* _SYS_ZIL_IMPL_H */