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, 2016 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>
42 * Used by arc_flush() to inform arc_evict_state() that it should evict
43 * all available buffers from the arc state being passed in.
45 #define ARC_EVICT_ALL -1ULL
47 typedef struct arc_buf_hdr arc_buf_hdr_t
;
48 typedef struct arc_buf arc_buf_t
;
49 typedef struct arc_prune arc_prune_t
;
50 typedef void arc_done_func_t(zio_t
*zio
, arc_buf_t
*buf
, void *private);
51 typedef void arc_prune_func_t(int64_t bytes
, void *private);
52 typedef int arc_evict_func_t(void *private);
54 /* Shared module parameters */
55 extern int zfs_arc_average_blocksize
;
57 /* generic arc_done_func_t's which you can use */
58 arc_done_func_t arc_bcopy_func
;
59 arc_done_func_t arc_getbuf_func
;
61 /* generic arc_prune_func_t wrapper for callbacks */
63 arc_prune_func_t
*p_pfunc
;
70 typedef enum arc_strategy
{
71 ARC_STRATEGY_META_ONLY
= 0, /* Evict only meta data buffers */
72 ARC_STRATEGY_META_BALANCED
= 1, /* Evict data buffers if needed */
75 typedef enum arc_flags
78 * Public flags that can be passed into the ARC by external consumers.
80 ARC_FLAG_NONE
= 1 << 0, /* No flags set */
81 ARC_FLAG_WAIT
= 1 << 1, /* perform sync I/O */
82 ARC_FLAG_NOWAIT
= 1 << 2, /* perform async I/O */
83 ARC_FLAG_PREFETCH
= 1 << 3, /* I/O is a prefetch */
84 ARC_FLAG_CACHED
= 1 << 4, /* I/O was in cache */
85 ARC_FLAG_L2CACHE
= 1 << 5, /* cache in L2ARC */
86 ARC_FLAG_L2COMPRESS
= 1 << 6, /* compress in L2ARC */
87 ARC_FLAG_PREDICTIVE_PREFETCH
= 1 << 7, /* I/O from zfetch */
90 * Private ARC flags. These flags are private ARC only flags that
91 * will show up in b_flags in the arc_hdr_buf_t. These flags should
92 * only be set by ARC code.
94 ARC_FLAG_IN_HASH_TABLE
= 1 << 8, /* buffer is hashed */
95 ARC_FLAG_IO_IN_PROGRESS
= 1 << 9, /* I/O in progress */
96 ARC_FLAG_IO_ERROR
= 1 << 10, /* I/O failed for buf */
97 ARC_FLAG_FREED_IN_READ
= 1 << 11, /* freed during read */
98 ARC_FLAG_BUF_AVAILABLE
= 1 << 12, /* block not in use */
99 ARC_FLAG_INDIRECT
= 1 << 13, /* indirect block */
100 /* Indicates that block was read with ASYNC priority. */
101 ARC_FLAG_PRIO_ASYNC_READ
= 1 << 14,
102 ARC_FLAG_L2_WRITING
= 1 << 15, /* write in progress */
103 ARC_FLAG_L2_EVICTED
= 1 << 16, /* evicted during I/O */
104 ARC_FLAG_L2_WRITE_HEAD
= 1 << 17, /* head of write list */
105 /* indicates that the buffer contains metadata (otherwise, data) */
106 ARC_FLAG_BUFC_METADATA
= 1 << 18,
108 /* Flags specifying whether optional hdr struct fields are defined */
109 ARC_FLAG_HAS_L1HDR
= 1 << 19,
110 ARC_FLAG_HAS_L2HDR
= 1 << 20,
115 arc_buf_hdr_t
*b_hdr
;
117 kmutex_t b_evict_lock
;
119 arc_evict_func_t
*b_efunc
;
123 typedef enum arc_buf_contents
{
124 ARC_BUFC_DATA
, /* buffer contains data */
125 ARC_BUFC_METADATA
, /* buffer contains metadata */
127 } arc_buf_contents_t
;
130 * The following breakdows of arc_size exist for kstat only.
132 typedef enum arc_space_type
{
141 typedef enum arc_state_type
{
151 typedef struct arc_buf_info
{
152 arc_state_type_t abi_state_type
;
153 arc_buf_contents_t abi_state_contents
;
155 uint32_t abi_datacnt
;
159 uint32_t abi_mru_hits
;
160 uint32_t abi_mru_ghost_hits
;
161 uint32_t abi_mfu_hits
;
162 uint32_t abi_mfu_ghost_hits
;
163 uint32_t abi_l2arc_hits
;
165 uint64_t abi_l2arc_dattr
;
166 uint64_t abi_l2arc_asize
;
167 enum zio_compress abi_l2arc_compress
;
170 void arc_space_consume(uint64_t space
, arc_space_type_t type
);
171 void arc_space_return(uint64_t space
, arc_space_type_t type
);
172 arc_buf_t
*arc_buf_alloc(spa_t
*spa
, uint64_t size
, void *tag
,
173 arc_buf_contents_t type
);
174 arc_buf_t
*arc_loan_buf(spa_t
*spa
, uint64_t size
);
175 void arc_return_buf(arc_buf_t
*buf
, void *tag
);
176 void arc_loan_inuse_buf(arc_buf_t
*buf
, void *tag
);
177 void arc_buf_add_ref(arc_buf_t
*buf
, void *tag
);
178 boolean_t
arc_buf_remove_ref(arc_buf_t
*buf
, void *tag
);
179 void arc_buf_info(arc_buf_t
*buf
, arc_buf_info_t
*abi
, int state_index
);
180 uint64_t arc_buf_size(arc_buf_t
*buf
);
181 void arc_release(arc_buf_t
*buf
, void *tag
);
182 int arc_released(arc_buf_t
*buf
);
183 void arc_buf_sigsegv(int sig
, siginfo_t
*si
, void *unused
);
184 void arc_buf_freeze(arc_buf_t
*buf
);
185 void arc_buf_thaw(arc_buf_t
*buf
);
186 boolean_t
arc_buf_eviction_needed(arc_buf_t
*buf
);
188 int arc_referenced(arc_buf_t
*buf
);
191 int arc_read(zio_t
*pio
, spa_t
*spa
, const blkptr_t
*bp
,
192 arc_done_func_t
*done
, void *private, zio_priority_t priority
, int flags
,
193 arc_flags_t
*arc_flags
, const zbookmark_phys_t
*zb
);
194 zio_t
*arc_write(zio_t
*pio
, spa_t
*spa
, uint64_t txg
,
195 blkptr_t
*bp
, arc_buf_t
*buf
, boolean_t l2arc
, boolean_t l2arc_compress
,
196 const zio_prop_t
*zp
,
197 arc_done_func_t
*ready
, arc_done_func_t
*child_ready
,
198 arc_done_func_t
*physdone
, arc_done_func_t
*done
,
199 void *private, zio_priority_t priority
, int zio_flags
,
200 const zbookmark_phys_t
*zb
);
202 arc_prune_t
*arc_add_prune_callback(arc_prune_func_t
*func
, void *private);
203 void arc_remove_prune_callback(arc_prune_t
*p
);
204 void arc_freed(spa_t
*spa
, const blkptr_t
*bp
);
206 void arc_set_callback(arc_buf_t
*buf
, arc_evict_func_t
*func
, void *private);
207 boolean_t
arc_clear_callback(arc_buf_t
*buf
);
209 void arc_flush(spa_t
*spa
, boolean_t retry
);
210 void arc_tempreserve_clear(uint64_t reserve
);
211 int arc_tempreserve_space(uint64_t reserve
, uint64_t txg
);
220 void l2arc_add_vdev(spa_t
*spa
, vdev_t
*vd
);
221 void l2arc_remove_vdev(vdev_t
*vd
);
222 boolean_t
l2arc_vdev_present(vdev_t
*vd
);
223 void l2arc_init(void);
224 void l2arc_fini(void);
225 void l2arc_start(void);
226 void l2arc_stop(void);
229 extern boolean_t arc_watch
;
236 #endif /* _SYS_ARC_H */