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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved. 24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 25 */ 26 27 #ifndef _SYS_ARC_H 28 #define _SYS_ARC_H 29 30 #include <sys/zfs_context.h> 31 32 #ifdef __cplusplus 33 extern "C" { 34 #endif 35 36 #include <sys/zio.h> 37 #include <sys/dmu.h> 38 #include <sys/spa.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 int arc_evict_func_t(void *private); 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 kmutex_t b_evict_lock; 53 void *b_data; 54 arc_evict_func_t *b_efunc; 55 void *b_private; 56 }; 57 58 typedef enum arc_buf_contents { 59 ARC_BUFC_DATA, /* buffer contains data */ 60 ARC_BUFC_METADATA, /* buffer contains metadata */ 61 ARC_BUFC_NUMTYPES 62 } arc_buf_contents_t; 63 /* 64 * These are the flags we pass into calls to the arc 65 */ 66 #define ARC_WAIT (1 << 1) /* perform I/O synchronously */ 67 #define ARC_NOWAIT (1 << 2) /* perform I/O asynchronously */ 68 #define ARC_PREFETCH (1 << 3) /* I/O is a prefetch */ 69 #define ARC_CACHED (1 << 4) /* I/O was already in cache */ 70 #define ARC_L2CACHE (1 << 5) /* cache in L2ARC */ 71 #define ARC_L2COMPRESS (1 << 6) /* compress in L2ARC */ 72 73 /* 74 * The following breakdows of arc_size exist for kstat only. 75 */ 76 typedef enum arc_space_type { 77 ARC_SPACE_DATA, 78 ARC_SPACE_HDRS, 79 ARC_SPACE_L2HDRS, 80 ARC_SPACE_OTHER, 81 ARC_SPACE_NUMTYPES 82 } arc_space_type_t; 83 84 void arc_space_consume(uint64_t space, arc_space_type_t type); 85 void arc_space_return(uint64_t space, arc_space_type_t type); 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_loan_inuse_buf(arc_buf_t *buf, void *tag); 91 void arc_buf_add_ref(arc_buf_t *buf, void *tag); 92 boolean_t arc_buf_remove_ref(arc_buf_t *buf, void *tag); 93 int arc_buf_size(arc_buf_t *buf); 94 void arc_release(arc_buf_t *buf, void *tag); 95 int arc_released(arc_buf_t *buf); 96 void arc_buf_freeze(arc_buf_t *buf); 97 void arc_buf_thaw(arc_buf_t *buf); 98 boolean_t arc_buf_eviction_needed(arc_buf_t *buf); 99 #ifdef ZFS_DEBUG 100 int arc_referenced(arc_buf_t *buf); 101 #endif 102 103 int arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 104 arc_done_func_t *done, void *private, zio_priority_t priority, int flags, 105 uint32_t *arc_flags, const zbookmark_phys_t *zb); 106 zio_t *arc_write(zio_t *pio, spa_t *spa, uint64_t txg, 107 blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, boolean_t l2arc_compress, 108 const zio_prop_t *zp, arc_done_func_t *ready, arc_done_func_t *physdone, 109 arc_done_func_t *done, void *private, zio_priority_t priority, 110 int zio_flags, const zbookmark_phys_t *zb); 111 void arc_freed(spa_t *spa, const blkptr_t *bp); 112 113 void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private); 114 boolean_t arc_clear_callback(arc_buf_t *buf); 115 116 void arc_flush(spa_t *spa); 117 void arc_tempreserve_clear(uint64_t reserve); 118 int arc_tempreserve_space(uint64_t reserve, uint64_t txg); 119 120 void arc_init(void); 121 void arc_fini(void); 122 123 /* 124 * Level 2 ARC 125 */ 126 127 void l2arc_add_vdev(spa_t *spa, vdev_t *vd); 128 void l2arc_remove_vdev(vdev_t *vd); 129 boolean_t l2arc_vdev_present(vdev_t *vd); 130 void l2arc_init(void); 131 void l2arc_fini(void); 132 void l2arc_start(void); 133 void l2arc_stop(void); 134 135 #ifndef _KERNEL 136 extern boolean_t arc_watch; 137 extern int arc_procfd; 138 #endif 139 140 #ifdef __cplusplus 141 } 142 #endif 143 144 #endif /* _SYS_ARC_H */ 145