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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 /*
     27  * Copyright (c) 2014 by Delphix. All rights reserved.
     28  */
     29 
     30 #ifndef	_DMU_ZFETCH_H
     31 #define	_DMU_ZFETCH_H
     32 
     33 #include <sys/zfs_context.h>
     34 
     35 #ifdef	__cplusplus
     36 extern "C" {
     37 #endif
     38 
     39 extern uint64_t	zfetch_array_rd_sz;
     40 
     41 struct dnode;				/* so we can reference dnode */
     42 
     43 typedef struct zstream {
     44 	uint64_t	zs_blkid;	/* expect next access at this blkid */
     45 	uint64_t	zs_pf_blkid;	/* next block to prefetch */
     46 
     47 	/*
     48 	 * We will next prefetch the L1 indirect block of this level-0
     49 	 * block id.
     50 	 */
     51 	uint64_t	zs_ipf_blkid;
     52 
     53 	kmutex_t	zs_lock;	/* protects stream */
     54 	hrtime_t	zs_atime;	/* time last prefetch issued */
     55 	list_node_t	zs_node;	/* link for zf_stream */
     56 } zstream_t;
     57 
     58 typedef struct zfetch {
     59 	krwlock_t	zf_rwlock;	/* protects zfetch structure */
     60 	list_t		zf_stream;	/* list of zstream_t's */
     61 	struct dnode	*zf_dnode;	/* dnode that owns this zfetch */
     62 } zfetch_t;
     63 
     64 void		zfetch_init(void);
     65 void		zfetch_fini(void);
     66 
     67 void		dmu_zfetch_init(zfetch_t *, struct dnode *);
     68 void		dmu_zfetch_fini(zfetch_t *);
     69 void		dmu_zfetch(zfetch_t *, uint64_t, uint64_t, boolean_t);
     70 
     71 
     72 #ifdef	__cplusplus
     73 }
     74 #endif
     75 
     76 #endif	/* _DMU_ZFETCH_H */
     77