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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _SYS_ARC_H 28 #define _SYS_ARC_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include <sys/zfs_context.h> 33 34 #ifdef __cplusplus 35 extern "C" { 36 #endif 37 38 #include <sys/zio.h> 39 40 typedef struct arc_buf_hdr arc_buf_hdr_t; 41 typedef struct arc_buf arc_buf_t; 42 typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private); 43 typedef void arc_byteswap_func_t(void *buf, size_t size); 44 45 /* generic arc_done_func_t's which you can use */ 46 arc_done_func_t arc_bcopy_func; 47 arc_done_func_t arc_getbuf_func; 48 49 struct arc_buf { 50 arc_buf_hdr_t *b_hdr; 51 arc_buf_t *b_next; 52 void *b_data; 53 }; 54 55 /* 56 * These are the flags we pass into calls to the arc 57 */ 58 #define ARC_WAIT (1 << 1) /* perform I/O synchronously */ 59 #define ARC_NOWAIT (1 << 2) /* perform I/O asynchronously */ 60 #define ARC_PREFETCH (1 << 3) /* I/O is a prefetch */ 61 62 arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag); 63 void arc_buf_free(arc_buf_t *buf, void *tag); 64 int arc_buf_size(arc_buf_t *buf); 65 void arc_release(arc_buf_t *buf, void *tag); 66 int arc_released(arc_buf_t *buf); 67 68 int arc_read(zio_t *pio, spa_t *spa, blkptr_t *bp, arc_byteswap_func_t *swap, 69 arc_done_func_t *done, void *private, int priority, int flags, 70 uint32_t arc_flags); 71 int arc_write(zio_t *pio, spa_t *spa, int checksum, int compress, 72 uint64_t txg, blkptr_t *bp, arc_buf_t *buf, 73 arc_done_func_t *done, void *private, int priority, int flags, 74 uint32_t arc_flags); 75 int arc_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 76 zio_done_func_t *done, void *private, uint32_t arc_flags); 77 int arc_tryread(spa_t *spa, blkptr_t *bp, void *data); 78 79 void arc_flush(void); 80 void arc_tempreserve_clear(uint64_t tempreserve); 81 int arc_tempreserve_space(uint64_t tempreserve); 82 83 void arc_init(void); 84 void arc_fini(void); 85 86 #ifdef __cplusplus 87 } 88 #endif 89 90 #endif /* _SYS_ARC_H */ 91