/* * 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. */ #ifndef _DFETCH_H #define _DFETCH_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 enum zfetch_dirn { ZFETCH_FORWARD = 1, /* prefetch increasing block numbers */ ZFETCH_BACKWARD = -1 /* prefetch decreasing block numbers */ } zfetch_dirn_t; typedef struct zstream { uint64_t zst_offset; /* offset of starting block in range */ uint64_t zst_len; /* length of range, in blocks */ zfetch_dirn_t zst_direction; /* direction of prefetch */ uint64_t zst_stride; /* length of stride, in blocks */ uint64_t zst_ph_offset; /* prefetch offset, in blocks */ uint64_t zst_cap; /* prefetch limit (cap), in blocks */ kmutex_t zst_lock; /* protects stream */ clock_t zst_last; /* lbolt of last prefetch */ list_node_t zst_node; /* next zstream here */ } zstream_t; typedef struct zfetch { krwlock_t zf_rwlock; /* protects zfetch structure */ list_t zf_stream; /* AVL tree of zstream_t's */ struct dnode *zf_dnode; /* dnode that owns this zfetch */ uint32_t zf_stream_cnt; /* # of active streams */ uint64_t zf_alloc_fail; /* # of failed attempts to alloc strm */ } zfetch_t; void zfetch_init(void); void zfetch_fini(void); void dmu_zfetch_init(zfetch_t *, struct dnode *); void dmu_zfetch_rele(zfetch_t *); void dmu_zfetch(zfetch_t *, uint64_t, uint64_t, int); #ifdef __cplusplus } #endif #endif /* _DFETCH_H */