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 typedef enum arc_flags 50 { 51 /* 52 * Public flags that can be passed into the ARC by external consumers. 53 */ 54 ARC_FLAG_NONE = 1 << 0, /* No flags set */ 55 ARC_FLAG_WAIT = 1 << 1, /* perform sync I/O */ 56 ARC_FLAG_NOWAIT = 1 << 2, /* perform async I/O */ 57 ARC_FLAG_PREFETCH = 1 << 3, /* I/O is a prefetch */ 58 ARC_FLAG_CACHED = 1 << 4, /* I/O was in cache */ 59 ARC_FLAG_L2CACHE = 1 << 5, /* cache in L2ARC */ 60 ARC_FLAG_L2COMPRESS = 1 << 6, /* compress in L2ARC */ 61 62 /* 63 * Private ARC flags. These flags are private ARC only flags that 64 * will show up in b_flags in the arc_hdr_buf_t. These flags should 65 * only be set by ARC code. 66 */ 67 ARC_FLAG_IN_HASH_TABLE = 1 << 7, /* buffer is hashed */ 68 ARC_FLAG_IO_IN_PROGRESS = 1 << 8, /* I/O in progress */ 69 ARC_FLAG_IO_ERROR = 1 << 9, /* I/O failed for buf */ 70 ARC_FLAG_FREED_IN_READ = 1 << 10, /* freed during read */ 71 ARC_FLAG_BUF_AVAILABLE = 1 << 11, /* block not in use */ 72 ARC_FLAG_INDIRECT = 1 << 12, /* indirect block */ 73 ARC_FLAG_FREE_IN_PROGRESS = 1 << 13, /* about to be freed */ 74 ARC_FLAG_L2_WRITING = 1 << 14, /* write in progress */ 75 ARC_FLAG_L2_EVICTED = 1 << 15, /* evicted during I/O */ 76 ARC_FLAG_L2_WRITE_HEAD = 1 << 16, /* head of write list */ 77 } arc_flags_t; 78 79 struct arc_buf { 80 arc_buf_hdr_t *b_hdr; 81 arc_buf_t *b_next; 82 kmutex_t b_evict_lock; 83 void *b_data; 84 arc_evict_func_t *b_efunc; 85 void *b_private; 86 }; 87 88 typedef enum arc_buf_contents { 89 ARC_BUFC_DATA, /* buffer contains data */ 90 ARC_BUFC_METADATA, /* buffer contains metadata */ 91 ARC_BUFC_NUMTYPES 92 } arc_buf_contents_t; 93 94 /* 95 * The following breakdows of arc_size exist for kstat only. 96 */ 97 typedef enum arc_space_type { 98 ARC_SPACE_DATA, 99 ARC_SPACE_HDRS, 100 ARC_SPACE_L2HDRS, 101 ARC_SPACE_OTHER, 102 ARC_SPACE_NUMTYPES 103 } arc_space_type_t; 104 105 void arc_space_consume(uint64_t space, arc_space_type_t type); 106 void arc_space_return(uint64_t space, arc_space_type_t type); 107 arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag, 108 arc_buf_contents_t type); 109 arc_buf_t *arc_loan_buf(spa_t *spa, int size); 110 void arc_return_buf(arc_buf_t *buf, void *tag); 111 void arc_loan_inuse_buf(arc_buf_t *buf, void *tag); 112 void arc_buf_add_ref(arc_buf_t *buf, void *tag); 113 boolean_t arc_buf_remove_ref(arc_buf_t *buf, void *tag); 114 int arc_buf_size(arc_buf_t *buf); 115 void arc_release(arc_buf_t *buf, void *tag); 116 int arc_released(arc_buf_t *buf); 117 void arc_buf_freeze(arc_buf_t *buf); 118 void arc_buf_thaw(arc_buf_t *buf); 119 boolean_t arc_buf_eviction_needed(arc_buf_t *buf); 120 #ifdef ZFS_DEBUG 121 int arc_referenced(arc_buf_t *buf); 122 #endif 123 124 int arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 125 arc_done_func_t *done, void *private, zio_priority_t priority, int flags, 126 arc_flags_t *arc_flags, const zbookmark_phys_t *zb); 127 zio_t *arc_write(zio_t *pio, spa_t *spa, uint64_t txg, 128 blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, boolean_t l2arc_compress, 129 const zio_prop_t *zp, arc_done_func_t *ready, arc_done_func_t *physdone, 130 arc_done_func_t *done, void *private, zio_priority_t priority, 131 int zio_flags, const zbookmark_phys_t *zb); 132 void arc_freed(spa_t *spa, const blkptr_t *bp); 133 134 void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private); 135 boolean_t arc_clear_callback(arc_buf_t *buf); 136 137 void arc_flush(spa_t *spa); 138 void arc_tempreserve_clear(uint64_t reserve); 139 int arc_tempreserve_space(uint64_t reserve, uint64_t txg); 140 141 void arc_init(void); 142 void arc_fini(void); 143 144 /* 145 * Level 2 ARC 146 */ 147 148 void l2arc_add_vdev(spa_t *spa, vdev_t *vd); 149 void l2arc_remove_vdev(vdev_t *vd); 150 boolean_t l2arc_vdev_present(vdev_t *vd); 151 void l2arc_init(void); 152 void l2arc_fini(void); 153 void l2arc_start(void); 154 void l2arc_stop(void); 155 156 #ifndef _KERNEL 157 extern boolean_t arc_watch; 158 extern int arc_procfd; 159 #endif 160 161 #ifdef __cplusplus 162 } 163 #endif 164 165 #endif /* _SYS_ARC_H */ 166