1168404Spjd/* 2168404Spjd * CDDL HEADER START 3168404Spjd * 4168404Spjd * The contents of this file are subject to the terms of the 5168404Spjd * Common Development and Distribution License (the "License"). 6168404Spjd * You may not use this file except in compliance with the License. 7168404Spjd * 8168404Spjd * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9168404Spjd * or http://www.opensolaris.org/os/licensing. 10168404Spjd * See the License for the specific language governing permissions 11168404Spjd * and limitations under the License. 12168404Spjd * 13168404Spjd * When distributing Covered Code, include this CDDL HEADER in each 14168404Spjd * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15168404Spjd * If applicable, add the following below this CDDL HEADER, with the 16168404Spjd * fields enclosed by brackets "[]" replaced with your own identifying 17168404Spjd * information: Portions Copyright [yyyy] [name of copyright owner] 18168404Spjd * 19168404Spjd * CDDL HEADER END 20168404Spjd */ 21168404Spjd/* 22208130Smm * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23168404Spjd * Use is subject to license terms. 24168404Spjd */ 25168404Spjd 26168404Spjd#ifndef _DFETCH_H 27168404Spjd#define _DFETCH_H 28168404Spjd 29168404Spjd#include <sys/zfs_context.h> 30168404Spjd 31168404Spjd#ifdef __cplusplus 32168404Spjdextern "C" { 33168404Spjd#endif 34168404Spjd 35168404Spjdextern uint64_t zfetch_array_rd_sz; 36168404Spjd 37168404Spjdstruct dnode; /* so we can reference dnode */ 38168404Spjd 39168404Spjdtypedef enum zfetch_dirn { 40168404Spjd ZFETCH_FORWARD = 1, /* prefetch increasing block numbers */ 41168404Spjd ZFETCH_BACKWARD = -1 /* prefetch decreasing block numbers */ 42168404Spjd} zfetch_dirn_t; 43168404Spjd 44168404Spjdtypedef struct zstream { 45168404Spjd uint64_t zst_offset; /* offset of starting block in range */ 46168404Spjd uint64_t zst_len; /* length of range, in blocks */ 47168404Spjd zfetch_dirn_t zst_direction; /* direction of prefetch */ 48168404Spjd uint64_t zst_stride; /* length of stride, in blocks */ 49168404Spjd uint64_t zst_ph_offset; /* prefetch offset, in blocks */ 50168404Spjd uint64_t zst_cap; /* prefetch limit (cap), in blocks */ 51168404Spjd kmutex_t zst_lock; /* protects stream */ 52168404Spjd clock_t zst_last; /* lbolt of last prefetch */ 53168404Spjd avl_node_t zst_node; /* embed avl node here */ 54168404Spjd} zstream_t; 55168404Spjd 56168404Spjdtypedef struct zfetch { 57168404Spjd krwlock_t zf_rwlock; /* protects zfetch structure */ 58168404Spjd list_t zf_stream; /* AVL tree of zstream_t's */ 59168404Spjd struct dnode *zf_dnode; /* dnode that owns this zfetch */ 60168404Spjd uint32_t zf_stream_cnt; /* # of active streams */ 61168404Spjd uint64_t zf_alloc_fail; /* # of failed attempts to alloc strm */ 62168404Spjd} zfetch_t; 63168404Spjd 64208130Smmvoid zfetch_init(void); 65208130Smmvoid zfetch_fini(void); 66208130Smm 67168404Spjdvoid dmu_zfetch_init(zfetch_t *, struct dnode *); 68168404Spjdvoid dmu_zfetch_rele(zfetch_t *); 69168404Spjdvoid dmu_zfetch(zfetch_t *, uint64_t, uint64_t, int); 70168404Spjd 71168404Spjd 72168404Spjd#ifdef __cplusplus 73168404Spjd} 74168404Spjd#endif 75168404Spjd 76168404Spjd#endif /* _DFETCH_H */ 77