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 #define HDR_SET_LSIZE(hdr, x) do { \
48 ASSERT(IS_P2ALIGNED(x, 1U << SPA_MINBLOCKSHIFT)); \
49 (hdr)->b_lsize = ((x) >> SPA_MINBLOCKSHIFT); \
50 _NOTE(CONSTCOND) } while (0)
52 #define HDR_SET_PSIZE(hdr, x) do { \
53 ASSERT(IS_P2ALIGNED((x), 1U << SPA_MINBLOCKSHIFT)); \
54 (hdr)->b_psize = ((x) >> SPA_MINBLOCKSHIFT); \
55 _NOTE(CONSTCOND) } while (0)
57 #define HDR_GET_LSIZE(hdr) ((hdr)->b_lsize << SPA_MINBLOCKSHIFT)
58 #define HDR_GET_PSIZE(hdr) ((hdr)->b_psize << SPA_MINBLOCKSHIFT)
60 typedef struct arc_buf_hdr arc_buf_hdr_t
;
61 typedef struct arc_buf arc_buf_t
;
62 typedef struct arc_prune arc_prune_t
;
63 typedef void arc_done_func_t(zio_t
*zio
, arc_buf_t
*buf
, void *private);
64 typedef void arc_prune_func_t(int64_t bytes
, void *private);
66 /* Shared module parameters */
67 extern int zfs_arc_average_blocksize
;
69 /* generic arc_done_func_t's which you can use */
70 arc_done_func_t arc_bcopy_func
;
71 arc_done_func_t arc_getbuf_func
;
73 /* generic arc_prune_func_t wrapper for callbacks */
75 arc_prune_func_t
*p_pfunc
;
82 typedef enum arc_strategy
{
83 ARC_STRATEGY_META_ONLY
= 0, /* Evict only meta data buffers */
84 ARC_STRATEGY_META_BALANCED
= 1, /* Evict data buffers if needed */
87 typedef enum arc_flags
90 * Public flags that can be passed into the ARC by external consumers.
92 ARC_FLAG_WAIT
= 1 << 0, /* perform sync I/O */
93 ARC_FLAG_NOWAIT
= 1 << 1, /* perform async I/O */
94 ARC_FLAG_PREFETCH
= 1 << 2, /* I/O is a prefetch */
95 ARC_FLAG_CACHED
= 1 << 3, /* I/O was in cache */
96 ARC_FLAG_L2CACHE
= 1 << 4, /* cache in L2ARC */
97 ARC_FLAG_PREDICTIVE_PREFETCH
= 1 << 5, /* I/O from zfetch */
100 * Private ARC flags. These flags are private ARC only flags that
101 * will show up in b_flags in the arc_hdr_buf_t. These flags should
102 * only be set by ARC code.
104 ARC_FLAG_IN_HASH_TABLE
= 1 << 6, /* buffer is hashed */
105 ARC_FLAG_IO_IN_PROGRESS
= 1 << 7, /* I/O in progress */
106 ARC_FLAG_IO_ERROR
= 1 << 8, /* I/O failed for buf */
107 ARC_FLAG_INDIRECT
= 1 << 9, /* indirect block */
108 /* Indicates that block was read with ASYNC priority. */
109 ARC_FLAG_PRIO_ASYNC_READ
= 1 << 10,
110 ARC_FLAG_L2_WRITING
= 1 << 11, /* write in progress */
111 ARC_FLAG_L2_EVICTED
= 1 << 12, /* evicted during I/O */
112 ARC_FLAG_L2_WRITE_HEAD
= 1 << 13, /* head of write list */
113 /* indicates that the buffer contains metadata (otherwise, data) */
114 ARC_FLAG_BUFC_METADATA
= 1 << 14,
116 /* Flags specifying whether optional hdr struct fields are defined */
117 ARC_FLAG_HAS_L1HDR
= 1 << 15,
118 ARC_FLAG_HAS_L2HDR
= 1 << 16,
121 * Indicates the arc_buf_hdr_t's b_pdata matches the on-disk data.
122 * This allows the l2arc to use the blkptr's checksum to verify
123 * the data without having to store the checksum in the hdr.
125 ARC_FLAG_COMPRESSED_ARC
= 1 << 17,
126 ARC_FLAG_SHARED_DATA
= 1 << 18,
129 * The arc buffer's compression mode is stored in the top 7 bits of the
130 * flags field, so these dummy flags are included so that MDB can
131 * interpret the enum properly.
133 ARC_FLAG_COMPRESS_0
= 1 << 24,
134 ARC_FLAG_COMPRESS_1
= 1 << 25,
135 ARC_FLAG_COMPRESS_2
= 1 << 26,
136 ARC_FLAG_COMPRESS_3
= 1 << 27,
137 ARC_FLAG_COMPRESS_4
= 1 << 28,
138 ARC_FLAG_COMPRESS_5
= 1 << 29,
139 ARC_FLAG_COMPRESS_6
= 1 << 30
143 typedef enum arc_buf_flags
{
144 ARC_BUF_FLAG_SHARED
= 1 << 0,
145 ARC_BUF_FLAG_COMPRESSED
= 1 << 1
149 arc_buf_hdr_t
*b_hdr
;
151 kmutex_t b_evict_lock
;
153 arc_buf_flags_t b_flags
;
156 typedef enum arc_buf_contents
{
157 ARC_BUFC_INVALID
, /* invalid type */
158 ARC_BUFC_DATA
, /* buffer contains data */
159 ARC_BUFC_METADATA
, /* buffer contains metadata */
161 } arc_buf_contents_t
;
164 * The following breakdows of arc_size exist for kstat only.
166 typedef enum arc_space_type
{
177 typedef enum arc_state_type
{
187 typedef struct arc_buf_info
{
188 arc_state_type_t abi_state_type
;
189 arc_buf_contents_t abi_state_contents
;
195 uint32_t abi_mru_hits
;
196 uint32_t abi_mru_ghost_hits
;
197 uint32_t abi_mfu_hits
;
198 uint32_t abi_mfu_ghost_hits
;
199 uint32_t abi_l2arc_hits
;
201 uint64_t abi_l2arc_dattr
;
202 uint64_t abi_l2arc_asize
;
203 enum zio_compress abi_l2arc_compress
;
206 void arc_space_consume(uint64_t space
, arc_space_type_t type
);
207 void arc_space_return(uint64_t space
, arc_space_type_t type
);
208 boolean_t
arc_is_metadata(arc_buf_t
*buf
);
209 enum zio_compress
arc_get_compression(arc_buf_t
*buf
);
210 int arc_decompress(arc_buf_t
*buf
);
211 arc_buf_t
*arc_alloc_buf(spa_t
*spa
, void *tag
, arc_buf_contents_t type
,
213 arc_buf_t
*arc_alloc_compressed_buf(spa_t
*spa
, void *tag
,
214 uint64_t psize
, uint64_t lsize
, enum zio_compress compression_type
);
215 arc_buf_t
*arc_loan_buf(spa_t
*spa
, boolean_t is_metadata
, int size
);
216 arc_buf_t
*arc_loan_compressed_buf(spa_t
*spa
, uint64_t psize
, uint64_t lsize
,
217 enum zio_compress compression_type
);
218 void arc_return_buf(arc_buf_t
*buf
, void *tag
);
219 void arc_loan_inuse_buf(arc_buf_t
*buf
, void *tag
);
220 void arc_buf_destroy(arc_buf_t
*buf
, void *tag
);
221 void arc_buf_info(arc_buf_t
*buf
, arc_buf_info_t
*abi
, int state_index
);
222 uint64_t arc_buf_size(arc_buf_t
*buf
);
223 uint64_t arc_buf_lsize(arc_buf_t
*buf
);
224 void arc_buf_access(arc_buf_t
*buf
);
225 void arc_release(arc_buf_t
*buf
, void *tag
);
226 int arc_released(arc_buf_t
*buf
);
227 void arc_buf_sigsegv(int sig
, siginfo_t
*si
, void *unused
);
228 void arc_buf_freeze(arc_buf_t
*buf
);
229 void arc_buf_thaw(arc_buf_t
*buf
);
231 int arc_referenced(arc_buf_t
*buf
);
234 int arc_read(zio_t
*pio
, spa_t
*spa
, const blkptr_t
*bp
,
235 arc_done_func_t
*done
, void *private, zio_priority_t priority
, int flags
,
236 arc_flags_t
*arc_flags
, const zbookmark_phys_t
*zb
);
237 zio_t
*arc_write(zio_t
*pio
, spa_t
*spa
, uint64_t txg
,
238 blkptr_t
*bp
, arc_buf_t
*buf
, boolean_t l2arc
, const zio_prop_t
*zp
,
239 arc_done_func_t
*ready
, arc_done_func_t
*child_ready
,
240 arc_done_func_t
*physdone
, arc_done_func_t
*done
,
241 void *private, zio_priority_t priority
, int zio_flags
,
242 const zbookmark_phys_t
*zb
);
244 arc_prune_t
*arc_add_prune_callback(arc_prune_func_t
*func
, void *private);
245 void arc_remove_prune_callback(arc_prune_t
*p
);
246 void arc_freed(spa_t
*spa
, const blkptr_t
*bp
);
248 void arc_flush(spa_t
*spa
, boolean_t retry
);
249 void arc_tempreserve_clear(uint64_t reserve
);
250 int arc_tempreserve_space(uint64_t reserve
, uint64_t txg
);
252 uint64_t arc_target_bytes(void);
260 void l2arc_add_vdev(spa_t
*spa
, vdev_t
*vd
);
261 void l2arc_remove_vdev(vdev_t
*vd
);
262 boolean_t
l2arc_vdev_present(vdev_t
*vd
);
263 void l2arc_init(void);
264 void l2arc_fini(void);
265 void l2arc_start(void);
266 void l2arc_stop(void);
269 extern boolean_t arc_watch
;
276 #endif /* _SYS_ARC_H */