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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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 https://opensource.org/licenses/CDDL-1.0.
* 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 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 2014, 2017 by Delphix. All rights reserved.
*/
#ifndef _DMU_ZFETCH_H
#define _DMU_ZFETCH_H
#include <sys/zfs_context.h>
#ifdef __cplusplus
extern "C" {
#endif
struct dnode; /* so we can reference dnode */
typedef struct zfetch {
kmutex_t zf_lock; /* protects zfetch structure */
list_t zf_stream; /* list of zstream_t's */
struct dnode *zf_dnode; /* dnode that owns this zfetch */
int zf_numstreams; /* number of zstream_t's */
} zfetch_t;
typedef struct zsrange {
uint16_t start;
uint16_t end;
} zsrange_t;
#define ZFETCH_RANGES 9 /* Fits zstream_t into 128 bytes */
typedef struct zstream {
list_node_t zs_node; /* link for zf_stream */
uint64_t zs_blkid; /* expect next access at this blkid */
uint_t zs_atime; /* time last prefetch issued */
zsrange_t zs_ranges[ZFETCH_RANGES]; /* ranges from future */
unsigned int zs_pf_dist; /* data prefetch distance in bytes */
unsigned int zs_ipf_dist; /* L1 prefetch distance in bytes */
uint64_t zs_pf_start; /* first data block to prefetch */
uint64_t zs_pf_end; /* data block to prefetch up to */
uint64_t zs_ipf_start; /* first data block to prefetch L1 */
uint64_t zs_ipf_end; /* data block to prefetch L1 up to */
boolean_t zs_missed; /* stream saw cache misses */
boolean_t zs_more; /* need more distant prefetch */
zfs_refcount_t zs_callers; /* number of pending callers */
/*
* Number of stream references: dnode, callers and pending blocks.
* The stream memory is freed when the number returns to zero.
*/
zfs_refcount_t zs_refs;
} zstream_t;
void zfetch_init(void);
void zfetch_fini(void);
void dmu_zfetch_init(zfetch_t *, struct dnode *);
void dmu_zfetch_fini(zfetch_t *);
zstream_t *dmu_zfetch_prepare(zfetch_t *, uint64_t, uint64_t, boolean_t,
boolean_t);
void dmu_zfetch_run(zfetch_t *, zstream_t *, boolean_t, boolean_t);
void dmu_zfetch(zfetch_t *, uint64_t, uint64_t, boolean_t, boolean_t,
boolean_t);
#ifdef __cplusplus
}
#endif
#endif /* _DMU_ZFETCH_H */
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