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6214 zpools going south
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--- old/usr/src/uts/common/fs/zfs/sys/arc.h
+++ new/usr/src/uts/common/fs/zfs/sys/arc.h
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
24 24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25 25 */
26 26
27 27 #ifndef _SYS_ARC_H
28 28 #define _SYS_ARC_H
29 29
30 30 #include <sys/zfs_context.h>
31 31
32 32 #ifdef __cplusplus
33 33 extern "C" {
34 34 #endif
35 35
36 36 #include <sys/zio.h>
37 37 #include <sys/dmu.h>
38 38 #include <sys/spa.h>
39 39
40 40 /*
41 41 * Used by arc_flush() to inform arc_evict_state() that it should evict
42 42 * all available buffers from the arc state being passed in.
43 43 */
44 44 #define ARC_EVICT_ALL -1ULL
45 45
46 46 typedef struct arc_buf_hdr arc_buf_hdr_t;
47 47 typedef struct arc_buf arc_buf_t;
48 48 typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private);
49 49 typedef int arc_evict_func_t(void *private);
50 50
51 51 /* generic arc_done_func_t's which you can use */
52 52 arc_done_func_t arc_bcopy_func;
53 53 arc_done_func_t arc_getbuf_func;
54 54
55 55 typedef enum arc_flags
56 56 {
57 57 /*
58 58 * Public flags that can be passed into the ARC by external consumers.
59 59 */
60 60 ARC_FLAG_NONE = 1 << 0, /* No flags set */
61 61 ARC_FLAG_WAIT = 1 << 1, /* perform sync I/O */
62 62 ARC_FLAG_NOWAIT = 1 << 2, /* perform async I/O */
63 63 ARC_FLAG_PREFETCH = 1 << 3, /* I/O is a prefetch */
64 64 ARC_FLAG_CACHED = 1 << 4, /* I/O was in cache */
65 65 ARC_FLAG_L2CACHE = 1 << 5, /* cache in L2ARC */
66 66 ARC_FLAG_L2COMPRESS = 1 << 6, /* compress in L2ARC */
67 67
68 68 /*
69 69 * Private ARC flags. These flags are private ARC only flags that
70 70 * will show up in b_flags in the arc_hdr_buf_t. These flags should
71 71 * only be set by ARC code.
72 72 */
73 73 ARC_FLAG_IN_HASH_TABLE = 1 << 7, /* buffer is hashed */
74 74 ARC_FLAG_IO_IN_PROGRESS = 1 << 8, /* I/O in progress */
75 75 ARC_FLAG_IO_ERROR = 1 << 9, /* I/O failed for buf */
76 76 ARC_FLAG_FREED_IN_READ = 1 << 10, /* freed during read */
77 77 ARC_FLAG_BUF_AVAILABLE = 1 << 11, /* block not in use */
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78 78 ARC_FLAG_INDIRECT = 1 << 12, /* indirect block */
79 79 ARC_FLAG_L2_WRITING = 1 << 13, /* write in progress */
80 80 ARC_FLAG_L2_EVICTED = 1 << 14, /* evicted during I/O */
81 81 ARC_FLAG_L2_WRITE_HEAD = 1 << 15, /* head of write list */
82 82 /* indicates that the buffer contains metadata (otherwise, data) */
83 83 ARC_FLAG_BUFC_METADATA = 1 << 16,
84 84
85 85 /* Flags specifying whether optional hdr struct fields are defined */
86 86 ARC_FLAG_HAS_L1HDR = 1 << 17,
87 87 ARC_FLAG_HAS_L2HDR = 1 << 18,
88 -
89 - /*
90 - * The arc buffer's compression mode is stored in the top 7 bits of the
91 - * flags field, so these dummy flags are included so that MDB can
92 - * interpret the enum properly.
93 - */
94 - ARC_FLAG_COMPRESS_0 = 1 << 24,
95 - ARC_FLAG_COMPRESS_1 = 1 << 25,
96 - ARC_FLAG_COMPRESS_2 = 1 << 26,
97 - ARC_FLAG_COMPRESS_3 = 1 << 27,
98 - ARC_FLAG_COMPRESS_4 = 1 << 28,
99 - ARC_FLAG_COMPRESS_5 = 1 << 29,
100 - ARC_FLAG_COMPRESS_6 = 1 << 30
101 -
102 88 } arc_flags_t;
103 89
104 90 struct arc_buf {
105 91 arc_buf_hdr_t *b_hdr;
106 92 arc_buf_t *b_next;
107 93 kmutex_t b_evict_lock;
108 94 void *b_data;
109 95 arc_evict_func_t *b_efunc;
110 96 void *b_private;
111 97 };
112 98
113 99 typedef enum arc_buf_contents {
114 100 ARC_BUFC_DATA, /* buffer contains data */
115 101 ARC_BUFC_METADATA, /* buffer contains metadata */
116 102 ARC_BUFC_NUMTYPES
117 103 } arc_buf_contents_t;
118 104
119 105 /*
120 106 * The following breakdows of arc_size exist for kstat only.
121 107 */
122 108 typedef enum arc_space_type {
123 109 ARC_SPACE_DATA,
124 110 ARC_SPACE_META,
125 111 ARC_SPACE_HDRS,
126 112 ARC_SPACE_L2HDRS,
127 113 ARC_SPACE_OTHER,
128 114 ARC_SPACE_NUMTYPES
129 115 } arc_space_type_t;
130 116
131 117 void arc_space_consume(uint64_t space, arc_space_type_t type);
132 118 void arc_space_return(uint64_t space, arc_space_type_t type);
133 119 arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag,
134 120 arc_buf_contents_t type);
135 121 arc_buf_t *arc_loan_buf(spa_t *spa, int size);
136 122 void arc_return_buf(arc_buf_t *buf, void *tag);
137 123 void arc_loan_inuse_buf(arc_buf_t *buf, void *tag);
138 124 void arc_buf_add_ref(arc_buf_t *buf, void *tag);
139 125 boolean_t arc_buf_remove_ref(arc_buf_t *buf, void *tag);
140 126 int arc_buf_size(arc_buf_t *buf);
141 127 void arc_release(arc_buf_t *buf, void *tag);
142 128 int arc_released(arc_buf_t *buf);
143 129 void arc_buf_freeze(arc_buf_t *buf);
144 130 void arc_buf_thaw(arc_buf_t *buf);
145 131 boolean_t arc_buf_eviction_needed(arc_buf_t *buf);
146 132 #ifdef ZFS_DEBUG
147 133 int arc_referenced(arc_buf_t *buf);
148 134 #endif
149 135
150 136 int arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
151 137 arc_done_func_t *done, void *private, zio_priority_t priority, int flags,
152 138 arc_flags_t *arc_flags, const zbookmark_phys_t *zb);
153 139 zio_t *arc_write(zio_t *pio, spa_t *spa, uint64_t txg,
154 140 blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, boolean_t l2arc_compress,
155 141 const zio_prop_t *zp, arc_done_func_t *ready, arc_done_func_t *physdone,
156 142 arc_done_func_t *done, void *private, zio_priority_t priority,
157 143 int zio_flags, const zbookmark_phys_t *zb);
158 144 void arc_freed(spa_t *spa, const blkptr_t *bp);
159 145
160 146 void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private);
161 147 boolean_t arc_clear_callback(arc_buf_t *buf);
162 148
163 149 void arc_flush(spa_t *spa, boolean_t retry);
164 150 void arc_tempreserve_clear(uint64_t reserve);
165 151 int arc_tempreserve_space(uint64_t reserve, uint64_t txg);
166 152
167 153 void arc_init(void);
168 154 void arc_fini(void);
169 155
170 156 /*
171 157 * Level 2 ARC
172 158 */
173 159
174 160 void l2arc_add_vdev(spa_t *spa, vdev_t *vd);
175 161 void l2arc_remove_vdev(vdev_t *vd);
176 162 boolean_t l2arc_vdev_present(vdev_t *vd);
177 163 void l2arc_init(void);
178 164 void l2arc_fini(void);
179 165 void l2arc_start(void);
180 166 void l2arc_stop(void);
181 167
182 168 #ifndef _KERNEL
183 169 extern boolean_t arc_watch;
184 170 extern int arc_procfd;
185 171 #endif
186 172
187 173 #ifdef __cplusplus
188 174 }
189 175 #endif
190 176
191 177 #endif /* _SYS_ARC_H */
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