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 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_ARC_H 27 #define _SYS_ARC_H 28 29 #include <sys/zfs_context.h> 30 31 #ifdef __cplusplus 32 extern "C" { 33 #endif 34 35 #include <sys/zio.h> 36 #include <sys/dmu.h> 37 #include <sys/spa.h> 38 39 typedef struct arc_buf_hdr arc_buf_hdr_t; 40 typedef struct arc_buf arc_buf_t; 41 typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private); 42 typedef int arc_evict_func_t(void *private); 43 44 /* generic arc_done_func_t's which you can use */ 45 arc_done_func_t arc_bcopy_func; 46 arc_done_func_t arc_getbuf_func; 47 48 struct arc_buf { 49 arc_buf_hdr_t *b_hdr; 50 arc_buf_t *b_next; 51 krwlock_t b_lock; 52 void *b_data; 53 arc_evict_func_t *b_efunc; 54 void *b_private; 55 }; 56 57 typedef enum arc_buf_contents { 58 ARC_BUFC_DATA, /* buffer contains data */ 59 ARC_BUFC_METADATA, /* buffer contains metadata */ 60 ARC_BUFC_NUMTYPES 61 } arc_buf_contents_t; 62 /* 63 * These are the flags we pass into calls to the arc 64 */ 65 #define ARC_WAIT (1 << 1) /* perform I/O synchronously */ 66 #define ARC_NOWAIT (1 << 2) /* perform I/O asynchronously */ 67 #define ARC_PREFETCH (1 << 3) /* I/O is a prefetch */ 68 #define ARC_CACHED (1 << 4) /* I/O was already in cache */ 69 #define ARC_L2CACHE (1 << 5) /* cache in L2ARC */ 70 71 /* 72 * The following breakdows of arc_size exist for kstat only. 73 */ 74 typedef enum arc_space_type { 75 ARC_SPACE_DATA, 76 ARC_SPACE_HDRS, 77 ARC_SPACE_L2HDRS, 78 ARC_SPACE_OTHER, 79 ARC_SPACE_NUMTYPES 80 } arc_space_type_t; 81 82 void arc_space_consume(uint64_t space, arc_space_type_t type); 83 void arc_space_return(uint64_t space, arc_space_type_t type); 84 void *arc_data_buf_alloc(uint64_t space); 85 void arc_data_buf_free(void *buf, uint64_t space); 86 arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag, 87 arc_buf_contents_t type); 88 arc_buf_t *arc_loan_buf(spa_t *spa, int size); 89 void arc_return_buf(arc_buf_t *buf, void *tag); 90 void arc_buf_add_ref(arc_buf_t *buf, void *tag); 91 int arc_buf_remove_ref(arc_buf_t *buf, void *tag); 92 int arc_buf_size(arc_buf_t *buf); 93 void arc_release(arc_buf_t *buf, void *tag); 94 int arc_released(arc_buf_t *buf); 95 int arc_has_callback(arc_buf_t *buf); 96 void arc_buf_freeze(arc_buf_t *buf); 97 void arc_buf_thaw(arc_buf_t *buf); 98 #ifdef ZFS_DEBUG 99 int arc_referenced(arc_buf_t *buf); 100 #endif 101 102 typedef struct writeprops { 103 dmu_object_type_t wp_type; 104 uint8_t wp_level; 105 uint8_t wp_copies; 106 uint8_t wp_dncompress, wp_oscompress; 107 uint8_t wp_dnchecksum, wp_oschecksum; 108 } writeprops_t; 109 110 void write_policy(spa_t *spa, const writeprops_t *wp, zio_prop_t *zp); 111 int arc_read(zio_t *pio, spa_t *spa, blkptr_t *bp, arc_buf_t *pbuf, 112 arc_done_func_t *done, void *private, int priority, int zio_flags, 113 uint32_t *arc_flags, const zbookmark_t *zb); 114 int arc_read_nolock(zio_t *pio, spa_t *spa, blkptr_t *bp, 115 arc_done_func_t *done, void *private, int priority, int flags, 116 uint32_t *arc_flags, const zbookmark_t *zb); 117 zio_t *arc_write(zio_t *pio, spa_t *spa, const writeprops_t *wp, 118 boolean_t l2arc, uint64_t txg, blkptr_t *bp, arc_buf_t *buf, 119 arc_done_func_t *ready, arc_done_func_t *done, void *private, int priority, 120 int zio_flags, const zbookmark_t *zb); 121 int arc_free(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 122 zio_done_func_t *done, void *private, uint32_t arc_flags); 123 int arc_tryread(spa_t *spa, blkptr_t *bp, void *data); 124 125 void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private); 126 int arc_buf_evict(arc_buf_t *buf); 127 128 void arc_flush(spa_t *spa); 129 void arc_tempreserve_clear(uint64_t reserve); 130 int arc_tempreserve_space(uint64_t reserve, uint64_t txg); 131 132 void arc_init(void); 133 void arc_fini(void); 134 135 /* 136 * Level 2 ARC 137 */ 138 139 void l2arc_add_vdev(spa_t *spa, vdev_t *vd); 140 void l2arc_remove_vdev(vdev_t *vd); 141 boolean_t l2arc_vdev_present(vdev_t *vd); 142 void l2arc_init(void); 143 void l2arc_fini(void); 144 void l2arc_start(void); 145 void l2arc_stop(void); 146 147 #ifdef __cplusplus 148 } 149 #endif 150 151 #endif /* _SYS_ARC_H */ 152