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.
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.
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]
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.
30 #include <sys/zfs_context.h>
39 #include <sys/refcount.h>
41 typedef struct arc_buf_hdr arc_buf_hdr_t
;
42 typedef struct arc_buf arc_buf_t
;
43 typedef struct arc_prune arc_prune_t
;
44 typedef void arc_done_func_t(zio_t
*zio
, arc_buf_t
*buf
, void *private);
45 typedef void arc_prune_func_t(int64_t bytes
, void *private);
46 typedef int arc_evict_func_t(void *private);
48 /* generic arc_done_func_t's which you can use */
49 arc_done_func_t arc_bcopy_func
;
50 arc_done_func_t arc_getbuf_func
;
52 /* generic arc_prune_func_t wrapper for callbacks */
54 arc_prune_func_t
*p_pfunc
;
63 kmutex_t b_evict_lock
;
65 arc_evict_func_t
*b_efunc
;
69 typedef enum arc_buf_contents
{
70 ARC_BUFC_DATA
, /* buffer contains data */
71 ARC_BUFC_METADATA
, /* buffer contains metadata */
75 * These are the flags we pass into calls to the arc
77 #define ARC_WAIT (1 << 1) /* perform I/O synchronously */
78 #define ARC_NOWAIT (1 << 2) /* perform I/O asynchronously */
79 #define ARC_PREFETCH (1 << 3) /* I/O is a prefetch */
80 #define ARC_CACHED (1 << 4) /* I/O was already in cache */
81 #define ARC_L2CACHE (1 << 5) /* cache in L2ARC */
82 #define ARC_L2COMPRESS (1 << 6) /* compress in L2ARC */
85 * The following breakdows of arc_size exist for kstat only.
87 typedef enum arc_space_type
{
96 typedef enum arc_state_type
{
106 typedef struct arc_buf_info
{
107 arc_state_type_t abi_state_type
;
108 arc_buf_contents_t abi_state_contents
;
109 uint64_t abi_state_index
;
111 uint32_t abi_datacnt
;
115 uint32_t abi_mru_hits
;
116 uint32_t abi_mru_ghost_hits
;
117 uint32_t abi_mfu_hits
;
118 uint32_t abi_mfu_ghost_hits
;
119 uint32_t abi_l2arc_hits
;
121 uint64_t abi_l2arc_dattr
;
122 uint64_t abi_l2arc_asize
;
123 enum zio_compress abi_l2arc_compress
;
126 void arc_space_consume(uint64_t space
, arc_space_type_t type
);
127 void arc_space_return(uint64_t space
, arc_space_type_t type
);
128 arc_buf_t
*arc_buf_alloc(spa_t
*spa
, int size
, void *tag
,
129 arc_buf_contents_t type
);
130 arc_buf_t
*arc_loan_buf(spa_t
*spa
, int size
);
131 void arc_return_buf(arc_buf_t
*buf
, void *tag
);
132 void arc_loan_inuse_buf(arc_buf_t
*buf
, void *tag
);
133 void arc_buf_add_ref(arc_buf_t
*buf
, void *tag
);
134 boolean_t
arc_buf_remove_ref(arc_buf_t
*buf
, void *tag
);
135 void arc_buf_info(arc_buf_t
*buf
, arc_buf_info_t
*abi
, int state_index
);
136 int arc_buf_size(arc_buf_t
*buf
);
137 void arc_release(arc_buf_t
*buf
, void *tag
);
138 int arc_released(arc_buf_t
*buf
);
139 int arc_has_callback(arc_buf_t
*buf
);
140 void arc_buf_sigsegv(int sig
, siginfo_t
*si
, void *unused
);
141 void arc_buf_freeze(arc_buf_t
*buf
);
142 void arc_buf_thaw(arc_buf_t
*buf
);
143 boolean_t
arc_buf_eviction_needed(arc_buf_t
*buf
);
145 int arc_referenced(arc_buf_t
*buf
);
148 int arc_read(zio_t
*pio
, spa_t
*spa
, const blkptr_t
*bp
,
149 arc_done_func_t
*done
, void *private, zio_priority_t priority
, int flags
,
150 uint32_t *arc_flags
, const zbookmark_phys_t
*zb
);
151 zio_t
*arc_write(zio_t
*pio
, spa_t
*spa
, uint64_t txg
,
152 blkptr_t
*bp
, arc_buf_t
*buf
, boolean_t l2arc
, boolean_t l2arc_compress
,
153 const zio_prop_t
*zp
, arc_done_func_t
*ready
, arc_done_func_t
*physdone
,
154 arc_done_func_t
*done
, void *private, zio_priority_t priority
,
155 int zio_flags
, const zbookmark_phys_t
*zb
);
157 arc_prune_t
*arc_add_prune_callback(arc_prune_func_t
*func
, void *private);
158 void arc_remove_prune_callback(arc_prune_t
*p
);
159 void arc_freed(spa_t
*spa
, const blkptr_t
*bp
);
161 void arc_set_callback(arc_buf_t
*buf
, arc_evict_func_t
*func
, void *private);
162 int arc_buf_evict(arc_buf_t
*buf
);
164 void arc_flush(spa_t
*spa
);
165 void arc_tempreserve_clear(uint64_t reserve
);
166 int arc_tempreserve_space(uint64_t reserve
, uint64_t txg
);
175 void l2arc_add_vdev(spa_t
*spa
, vdev_t
*vd
);
176 void l2arc_remove_vdev(vdev_t
*vd
);
177 boolean_t
l2arc_vdev_present(vdev_t
*vd
);
178 void l2arc_init(void);
179 void l2arc_fini(void);
180 void l2arc_start(void);
181 void l2arc_stop(void);
184 extern boolean_t arc_watch
;
191 #endif /* _SYS_ARC_H */