1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 22c717a561Smaybee * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #ifndef _SYS_ARC_H 27fa9e4066Sahrens #define _SYS_ARC_H 28fa9e4066Sahrens 29fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 30fa9e4066Sahrens 31fa9e4066Sahrens #include <sys/zfs_context.h> 32fa9e4066Sahrens 33fa9e4066Sahrens #ifdef __cplusplus 34fa9e4066Sahrens extern "C" { 35fa9e4066Sahrens #endif 36fa9e4066Sahrens 37fa9e4066Sahrens #include <sys/zio.h> 38fa9e4066Sahrens 39fa9e4066Sahrens typedef struct arc_buf_hdr arc_buf_hdr_t; 40fa9e4066Sahrens typedef struct arc_buf arc_buf_t; 41fa9e4066Sahrens typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private); 42fa9e4066Sahrens typedef void arc_byteswap_func_t(void *buf, size_t size); 43ea8dc4b6Seschrock typedef int arc_evict_func_t(void *private); 44fa9e4066Sahrens 45fa9e4066Sahrens /* generic arc_done_func_t's which you can use */ 46fa9e4066Sahrens arc_done_func_t arc_bcopy_func; 47fa9e4066Sahrens arc_done_func_t arc_getbuf_func; 48fa9e4066Sahrens 49fa9e4066Sahrens struct arc_buf { 50fa9e4066Sahrens arc_buf_hdr_t *b_hdr; 51fa9e4066Sahrens arc_buf_t *b_next; 52fa9e4066Sahrens void *b_data; 53ea8dc4b6Seschrock arc_evict_func_t *b_efunc; 54ea8dc4b6Seschrock void *b_private; 55fa9e4066Sahrens }; 56fa9e4066Sahrens 57ad23a2dbSjohansen typedef enum arc_buf_contents { 58ad23a2dbSjohansen ARC_BUFC_DATA, /* buffer contains data */ 59*0e8c6158Smaybee ARC_BUFC_METADATA, /* buffer contains metadata */ 60*0e8c6158Smaybee ARC_BUFC_NUMTYPES 61ad23a2dbSjohansen } arc_buf_contents_t; 62fa9e4066Sahrens /* 63fa9e4066Sahrens * These are the flags we pass into calls to the arc 64fa9e4066Sahrens */ 65fa9e4066Sahrens #define ARC_WAIT (1 << 1) /* perform I/O synchronously */ 66fa9e4066Sahrens #define ARC_NOWAIT (1 << 2) /* perform I/O asynchronously */ 67fa9e4066Sahrens #define ARC_PREFETCH (1 << 3) /* I/O is a prefetch */ 6813506d1eSmaybee #define ARC_CACHED (1 << 4) /* I/O was already in cache */ 69fa9e4066Sahrens 70*0e8c6158Smaybee void arc_space_consume(uint64_t space); 71*0e8c6158Smaybee void arc_space_return(uint64_t space); 72*0e8c6158Smaybee void *arc_data_buf_alloc(uint64_t space); 73*0e8c6158Smaybee void arc_data_buf_free(void *buf, uint64_t space); 74ad23a2dbSjohansen arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag, 75ad23a2dbSjohansen arc_buf_contents_t type); 76ea8dc4b6Seschrock void arc_buf_add_ref(arc_buf_t *buf, void *tag); 77ea8dc4b6Seschrock int arc_buf_remove_ref(arc_buf_t *buf, void *tag); 78fa9e4066Sahrens int arc_buf_size(arc_buf_t *buf); 79fa9e4066Sahrens void arc_release(arc_buf_t *buf, void *tag); 80fa9e4066Sahrens int arc_released(arc_buf_t *buf); 81ea8dc4b6Seschrock int arc_has_callback(arc_buf_t *buf); 826b4acc8bSahrens void arc_buf_freeze(arc_buf_t *buf); 836b4acc8bSahrens void arc_buf_thaw(arc_buf_t *buf); 84ea8dc4b6Seschrock #ifdef ZFS_DEBUG 85ea8dc4b6Seschrock int arc_referenced(arc_buf_t *buf); 86ea8dc4b6Seschrock #endif 87fa9e4066Sahrens 88fa9e4066Sahrens int arc_read(zio_t *pio, spa_t *spa, blkptr_t *bp, arc_byteswap_func_t *swap, 89fa9e4066Sahrens arc_done_func_t *done, void *private, int priority, int flags, 9013506d1eSmaybee uint32_t *arc_flags, zbookmark_t *zb); 91c717a561Smaybee zio_t *arc_write(zio_t *pio, spa_t *spa, int checksum, int compress, 92c717a561Smaybee int ncopies, uint64_t txg, blkptr_t *bp, arc_buf_t *buf, 93c717a561Smaybee arc_done_func_t *ready, arc_done_func_t *done, void *private, int priority, 94c717a561Smaybee int flags, zbookmark_t *zb); 95fa9e4066Sahrens int arc_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 96fa9e4066Sahrens zio_done_func_t *done, void *private, uint32_t arc_flags); 97fa9e4066Sahrens int arc_tryread(spa_t *spa, blkptr_t *bp, void *data); 98fa9e4066Sahrens 99ea8dc4b6Seschrock void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private); 100ea8dc4b6Seschrock int arc_buf_evict(arc_buf_t *buf); 101ea8dc4b6Seschrock 102fa9e4066Sahrens void arc_flush(void); 103fa9e4066Sahrens void arc_tempreserve_clear(uint64_t tempreserve); 104fa9e4066Sahrens int arc_tempreserve_space(uint64_t tempreserve); 105fa9e4066Sahrens 106fa9e4066Sahrens void arc_init(void); 107fa9e4066Sahrens void arc_fini(void); 108fa9e4066Sahrens 109fa9e4066Sahrens #ifdef __cplusplus 110fa9e4066Sahrens } 111fa9e4066Sahrens #endif 112fa9e4066Sahrens 113fa9e4066Sahrens #endif /* _SYS_ARC_H */ 114