projects / mirror_zfs-debian.git / blame
| Commit | Line | Data |
|---|---|---|
| 34dc7c2f BB |
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 | /* | |
| 428870ff | 22 | * Copyright 2009 Sun Microsystems, Inc. All rights reserved. |
| 34dc7c2f BB |
23 | * Use is subject to license terms. |
| 24 | */ | |
| 25 | ||
| 26 | #ifndef _DFETCH_H | |
| 27 | #define _DFETCH_H | |
| 28 | ||
| 34dc7c2f BB |
29 | #include <sys/zfs_context.h> |
| 30 | ||
| 31 | #ifdef __cplusplus | |
| 32 | extern "C" { | |
| 33 | #endif | |
| 34 | ||
| 35 | extern uint64_t zfetch_array_rd_sz; | |
| 36 | ||
| 37 | struct dnode; /* so we can reference dnode */ | |
| 38 | ||
| 39 | typedef enum zfetch_dirn { | |
| 40 | ZFETCH_FORWARD = 1, /* prefetch increasing block numbers */ | |
| 41 | ZFETCH_BACKWARD = -1 /* prefetch decreasing block numbers */ | |
| 42 | } zfetch_dirn_t; | |
| 43 | ||
| 44 | typedef struct zstream { | |
| 45 | uint64_t zst_offset; /* offset of starting block in range */ | |
| 46 | uint64_t zst_len; /* length of range, in blocks */ | |
| 47 | zfetch_dirn_t zst_direction; /* direction of prefetch */ | |
| 48 | uint64_t zst_stride; /* length of stride, in blocks */ | |
| 49 | uint64_t zst_ph_offset; /* prefetch offset, in blocks */ | |
| 50 | uint64_t zst_cap; /* prefetch limit (cap), in blocks */ | |
| 51 | kmutex_t zst_lock; /* protects stream */ | |
| 52 | clock_t zst_last; /* lbolt of last prefetch */ | |
| 53 | avl_node_t zst_node; /* embed avl node here */ | |
| 54 | } zstream_t; | |
| 55 | ||
| 56 | typedef struct zfetch { | |
| 57 | krwlock_t zf_rwlock; /* protects zfetch structure */ | |
| 58 | list_t zf_stream; /* AVL tree of zstream_t's */ | |
| 59 | struct dnode *zf_dnode; /* dnode that owns this zfetch */ | |
| 60 | uint32_t zf_stream_cnt; /* # of active streams */ | |
| 61 | uint64_t zf_alloc_fail; /* # of failed attempts to alloc strm */ | |
| 62 | } zfetch_t; | |
| 63 | ||
| 428870ff BB |
64 | void zfetch_init(void); |
| 65 | void zfetch_fini(void); | |
| 66 | ||
| 34dc7c2f BB |
67 | void dmu_zfetch_init(zfetch_t *, struct dnode *); |
| 68 | void dmu_zfetch_rele(zfetch_t *); | |
| 69 | void dmu_zfetch(zfetch_t *, uint64_t, uint64_t, int); | |
| 70 | ||
| 71 | ||
| 72 | #ifdef __cplusplus | |
| 73 | } | |
| 74 | #endif | |
| 75 | ||
| 76 | #endif /* _DFETCH_H */ |