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, 2017 by Delphix. All rights reserved.
24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
30 #include <sys/zfs_context.h>
41 * Used by arc_flush() to inform arc_evict_state() that it should evict
42 * all available buffers from the arc state being passed in.
44 #define ARC_EVICT_ALL -1ULL
46 #define HDR_SET_LSIZE(hdr, x) do { \
47 ASSERT(IS_P2ALIGNED(x, 1U << SPA_MINBLOCKSHIFT)); \
48 (hdr)->b_lsize = ((x) >> SPA_MINBLOCKSHIFT); \
49 _NOTE(CONSTCOND) } while (0)
51 #define HDR_SET_PSIZE(hdr, x) do { \
52 ASSERT(IS_P2ALIGNED((x), 1U << SPA_MINBLOCKSHIFT)); \
53 (hdr)->b_psize = ((x) >> SPA_MINBLOCKSHIFT); \
54 _NOTE(CONSTCOND) } while (0)
56 #define HDR_GET_LSIZE(hdr) ((hdr)->b_lsize << SPA_MINBLOCKSHIFT)
57 #define HDR_GET_PSIZE(hdr) ((hdr)->b_psize << SPA_MINBLOCKSHIFT)
59 typedef struct arc_buf_hdr arc_buf_hdr_t;
60 typedef struct arc_buf arc_buf_t;
61 typedef struct arc_prune arc_prune_t;
64 * Because the ARC can store encrypted data, errors (not due to bugs) may arise
65 * while transforming data into its desired format - specifically, when
66 * decrypting, the key may not be present, or the HMAC may not be correct
67 * which signifies deliberate tampering with the on-disk state
68 * (assuming that the checksum was correct). If any error occurs, the "buf"
69 * parameter will be NULL.
71 typedef void arc_read_done_func_t(zio_t *zio, const zbookmark_phys_t *zb,
72 const blkptr_t *bp, arc_buf_t *buf, void *priv);
73 typedef void arc_write_done_func_t(zio_t *zio, arc_buf_t *buf, void *priv);
74 typedef void arc_prune_func_t(int64_t bytes, void *priv);
76 /* Shared module parameters */
77 extern uint64_t zfs_arc_average_blocksize;
79 /* generic arc_done_func_t's which you can use */
80 arc_read_done_func_t arc_bcopy_func;
81 arc_read_done_func_t arc_getbuf_func;
83 /* generic arc_prune_func_t wrapper for callbacks */
85 arc_prune_func_t *p_pfunc;
89 zfs_refcount_t p_refcnt;
92 typedef enum arc_strategy {
93 ARC_STRATEGY_META_ONLY = 0, /* Evict only meta data buffers */
94 ARC_STRATEGY_META_BALANCED = 1, /* Evict data buffers if needed */
97 typedef enum arc_flags
100 * Public flags that can be passed into the ARC by external consumers.
102 ARC_FLAG_WAIT = 1 << 0, /* perform sync I/O */
103 ARC_FLAG_NOWAIT = 1 << 1, /* perform async I/O */
104 ARC_FLAG_PREFETCH = 1 << 2, /* I/O is a prefetch */
105 ARC_FLAG_CACHED = 1 << 3, /* I/O was in cache */
106 ARC_FLAG_L2CACHE = 1 << 4, /* cache in L2ARC */
107 ARC_FLAG_PREDICTIVE_PREFETCH = 1 << 5, /* I/O from zfetch */
108 ARC_FLAG_PRESCIENT_PREFETCH = 1 << 6, /* long min lifespan */
111 * Private ARC flags. These flags are private ARC only flags that
112 * will show up in b_flags in the arc_hdr_buf_t. These flags should
113 * only be set by ARC code.
115 ARC_FLAG_IN_HASH_TABLE = 1 << 7, /* buffer is hashed */
116 ARC_FLAG_IO_IN_PROGRESS = 1 << 8, /* I/O in progress */
117 ARC_FLAG_IO_ERROR = 1 << 9, /* I/O failed for buf */
118 ARC_FLAG_INDIRECT = 1 << 10, /* indirect block */
119 /* Indicates that block was read with ASYNC priority. */
120 ARC_FLAG_PRIO_ASYNC_READ = 1 << 11,
121 ARC_FLAG_L2_WRITING = 1 << 12, /* write in progress */
122 ARC_FLAG_L2_EVICTED = 1 << 13, /* evicted during I/O */
123 ARC_FLAG_L2_WRITE_HEAD = 1 << 14, /* head of write list */
124 /* indicates that the buffer contains metadata (otherwise, data) */
125 ARC_FLAG_BUFC_METADATA = 1 << 15,
127 /* Flags specifying whether optional hdr struct fields are defined */
128 ARC_FLAG_HAS_L1HDR = 1 << 16,
129 ARC_FLAG_HAS_L2HDR = 1 << 17,
132 * Indicates the arc_buf_hdr_t's b_pdata matches the on-disk data.
133 * This allows the l2arc to use the blkptr's checksum to verify
134 * the data without having to store the checksum in the hdr.
136 ARC_FLAG_COMPRESSED_ARC = 1 << 18,
137 ARC_FLAG_SHARED_DATA = 1 << 19,
140 * The arc buffer's compression mode is stored in the top 7 bits of the
141 * flags field, so these dummy flags are included so that MDB can
142 * interpret the enum properly.
144 ARC_FLAG_COMPRESS_0 = 1 << 24,
145 ARC_FLAG_COMPRESS_1 = 1 << 25,
146 ARC_FLAG_COMPRESS_2 = 1 << 26,
147 ARC_FLAG_COMPRESS_3 = 1 << 27,
148 ARC_FLAG_COMPRESS_4 = 1 << 28,
149 ARC_FLAG_COMPRESS_5 = 1 << 29,
150 ARC_FLAG_COMPRESS_6 = 1 << 30
154 typedef enum arc_buf_flags {
155 ARC_BUF_FLAG_SHARED = 1 << 0,
156 ARC_BUF_FLAG_COMPRESSED = 1 << 1
160 arc_buf_hdr_t *b_hdr;
162 kmutex_t b_evict_lock;
164 arc_buf_flags_t b_flags;
167 typedef enum arc_buf_contents {
168 ARC_BUFC_INVALID, /* invalid type */
169 ARC_BUFC_DATA, /* buffer contains data */
170 ARC_BUFC_METADATA, /* buffer contains metadata */
172 } arc_buf_contents_t;
175 * The following breakdows of arc_size exist for kstat only.
177 typedef enum arc_space_type {
188 typedef enum arc_state_type {
198 typedef struct arc_buf_info {
199 arc_state_type_t abi_state_type;
200 arc_buf_contents_t abi_state_contents;
201 uint64_t abi_state_index;
207 uint32_t abi_mru_hits;
208 uint32_t abi_mru_ghost_hits;
209 uint32_t abi_mfu_hits;
210 uint32_t abi_mfu_ghost_hits;
211 uint32_t abi_l2arc_hits;
213 uint64_t abi_l2arc_dattr;
214 uint64_t abi_l2arc_asize;
215 enum zio_compress abi_l2arc_compress;
218 void arc_space_consume(uint64_t space, arc_space_type_t type);
219 void arc_space_return(uint64_t space, arc_space_type_t type);
220 boolean_t arc_is_metadata(arc_buf_t *buf);
221 enum zio_compress arc_get_compression(arc_buf_t *buf);
222 int arc_decompress(arc_buf_t *buf);
223 arc_buf_t *arc_alloc_buf(spa_t *spa, void *tag, arc_buf_contents_t type,
225 arc_buf_t *arc_alloc_compressed_buf(spa_t *spa, void *tag,
226 uint64_t psize, uint64_t lsize, enum zio_compress compression_type);
227 arc_buf_t *arc_loan_buf(spa_t *spa, boolean_t is_metadata, int size);
228 arc_buf_t *arc_loan_compressed_buf(spa_t *spa, uint64_t psize, uint64_t lsize,
229 enum zio_compress compression_type);
230 void arc_return_buf(arc_buf_t *buf, void *tag);
231 void arc_loan_inuse_buf(arc_buf_t *buf, void *tag);
232 void arc_buf_destroy(arc_buf_t *buf, void *tag);
233 void arc_buf_info(arc_buf_t *buf, arc_buf_info_t *abi, int state_index);
234 int arc_buf_size(arc_buf_t *buf);
235 int arc_buf_lsize(arc_buf_t *buf);
236 void arc_buf_access(arc_buf_t *buf);
237 void arc_release(arc_buf_t *buf, void *tag);
238 int arc_released(arc_buf_t *buf);
239 void arc_buf_freeze(arc_buf_t *buf);
240 void arc_buf_thaw(arc_buf_t *buf);
242 int arc_referenced(arc_buf_t *buf);
245 int arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
246 arc_read_done_func_t *done, void *priv, zio_priority_t priority,
247 int flags, arc_flags_t *arc_flags, const zbookmark_phys_t *zb);
248 zio_t *arc_write(zio_t *pio, spa_t *spa, uint64_t txg,
249 blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, const zio_prop_t *zp,
250 arc_write_done_func_t *ready, arc_write_done_func_t *child_ready,
251 arc_write_done_func_t *physdone, arc_write_done_func_t *done,
252 void *priv, zio_priority_t priority, int zio_flags,
253 const zbookmark_phys_t *zb);
255 arc_prune_t *arc_add_prune_callback(arc_prune_func_t *func, void *priv);
256 void arc_remove_prune_callback(arc_prune_t *p);
257 void arc_freed(spa_t *spa, const blkptr_t *bp);
259 void arc_flush(spa_t *spa, boolean_t retry);
260 void arc_tempreserve_clear(uint64_t reserve);
261 int arc_tempreserve_space(spa_t *spa, uint64_t reserve, uint64_t txg);
263 uint64_t arc_max_bytes(void);
271 void l2arc_add_vdev(spa_t *spa, vdev_t *vd);
272 void l2arc_remove_vdev(vdev_t *vd);
273 boolean_t l2arc_vdev_present(vdev_t *vd);
274 void l2arc_init(void);
275 void l2arc_fini(void);
276 void l2arc_start(void);
277 void l2arc_stop(void);
281 extern boolean_t arc_watch;
282 extern int arc_procfd;
290 #endif /* _SYS_ARC_H */