| /* |
| * 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 http://www.opensolaris.org/os/licensing. |
| * 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 |
| |
| extern unsigned long zfetch_array_rd_sz; |
| |
| 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 zstream { |
| uint64_t zs_blkid; /* expect next access at this blkid */ |
| 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 */ |
| |
| list_node_t zs_node; /* link for zf_stream */ |
| hrtime_t zs_atime; /* time last prefetch issued */ |
| zfetch_t *zs_fetch; /* parent fetch */ |
| 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(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 */ |