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, 2017 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 boolean_t); 71 72 73 #ifdef __cplusplus 74 } 75 #endif 76 77 #endif /* _DMU_ZFETCH_H */ 78