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 https://opensource.org/licenses/CDDL-1.0. 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 struct dnode; /* so we can reference dnode */ 40 41 typedef struct zfetch { 42 kmutex_t zf_lock; /* protects zfetch structure */ 43 list_t zf_stream; /* list of zstream_t's */ 44 struct dnode *zf_dnode; /* dnode that owns this zfetch */ 45 int zf_numstreams; /* number of zstream_t's */ 46 } zfetch_t; 47 48 typedef struct zstream { 49 uint64_t zs_blkid; /* expect next access at this blkid */ 50 unsigned int zs_pf_dist; /* data prefetch distance in bytes */ 51 unsigned int zs_ipf_dist; /* L1 prefetch distance in bytes */ 52 uint64_t zs_pf_start; /* first data block to prefetch */ 53 uint64_t zs_pf_end; /* data block to prefetch up to */ 54 uint64_t zs_ipf_start; /* first data block to prefetch L1 */ 55 uint64_t zs_ipf_end; /* data block to prefetch L1 up to */ 56 57 list_node_t zs_node; /* link for zf_stream */ 58 hrtime_t zs_atime; /* time last prefetch issued */ 59 zfetch_t *zs_fetch; /* parent fetch */ 60 boolean_t zs_missed; /* stream saw cache misses */ 61 boolean_t zs_more; /* need more distant prefetch */ 62 zfs_refcount_t zs_callers; /* number of pending callers */ 63 /* 64 * Number of stream references: dnode, callers and pending blocks. 65 * The stream memory is freed when the number returns to zero. 66 */ 67 zfs_refcount_t zs_refs; 68 } zstream_t; 69 70 void zfetch_init(void); 71 void zfetch_fini(void); 72 73 void dmu_zfetch_init(zfetch_t *, struct dnode *); 74 void dmu_zfetch_fini(zfetch_t *); 75 zstream_t *dmu_zfetch_prepare(zfetch_t *, uint64_t, uint64_t, boolean_t, 76 boolean_t); 77 void dmu_zfetch_run(zstream_t *, boolean_t, boolean_t); 78 void dmu_zfetch(zfetch_t *, uint64_t, uint64_t, boolean_t, boolean_t, 79 boolean_t); 80 81 82 #ifdef __cplusplus 83 } 84 #endif 85 86 #endif /* _DMU_ZFETCH_H */ 87