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--- old/usr/src/uts/common/fs/zfs/sys/space_map.h
+++ new/usr/src/uts/common/fs/zfs/sys/space_map.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 2006 Sun Microsystems, Inc. All rights reserved.
23 23 * Use is subject to license terms.
24 24 */
25 25
26 26 #ifndef _SYS_SPACE_MAP_H
27 27 #define _SYS_SPACE_MAP_H
28 28
29 29 #pragma ident "%Z%%M% %I% %E% SMI"
30 30
31 31 #include <sys/avl.h>
32 32 #include <sys/dmu.h>
33 33
34 34 #ifdef __cplusplus
35 35 extern "C" {
36 36 #endif
37 37
38 38 typedef struct space_map_ops space_map_ops_t;
39 39
40 40 typedef struct space_map {
41 41 avl_tree_t sm_root; /* AVL tree of map segments */
42 42 uint64_t sm_space; /* sum of all segments in the map */
43 43 uint64_t sm_start; /* start of map */
44 44 uint64_t sm_size; /* size of map */
45 45 uint8_t sm_shift; /* unit shift */
46 46 uint8_t sm_pad[3]; /* unused */
47 47 uint8_t sm_loaded; /* map loaded? */
48 48 uint8_t sm_loading; /* map loading? */
49 49 kcondvar_t sm_load_cv; /* map load completion */
50 50 space_map_ops_t *sm_ops; /* space map block picker ops vector */
51 51 void *sm_ppd; /* picker-private data */
52 52 kmutex_t *sm_lock; /* pointer to lock that protects map */
53 53 } space_map_t;
54 54
55 55 typedef struct space_seg {
56 56 avl_node_t ss_node; /* AVL node */
57 57 uint64_t ss_start; /* starting offset of this segment */
58 58 uint64_t ss_end; /* ending offset (non-inclusive) */
59 59 } space_seg_t;
60 60
61 61 typedef struct space_map_obj {
62 62 uint64_t smo_object; /* on-disk space map object */
63 63 uint64_t smo_objsize; /* size of the object */
64 64 uint64_t smo_alloc; /* space allocated from the map */
65 65 } space_map_obj_t;
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66 66
67 67 struct space_map_ops {
68 68 void (*smop_load)(space_map_t *sm);
69 69 void (*smop_unload)(space_map_t *sm);
70 70 uint64_t (*smop_alloc)(space_map_t *sm, uint64_t size);
71 71 void (*smop_claim)(space_map_t *sm, uint64_t start, uint64_t size);
72 72 void (*smop_free)(space_map_t *sm, uint64_t start, uint64_t size);
73 73 };
74 74
75 75 /*
76 - * debug entry
76 + * allocation/free entry
77 77 *
78 - * 1 3 10 50
79 - * ,---+--------+------------+---------------------------------.
80 - * | 1 | action | syncpass | txg (lower bits) |
81 - * `---+--------+------------+---------------------------------'
82 - * 63 62 60 59 50 49 0
83 - *
84 - *
85 - *
86 - * non-debug entry
87 - *
88 78 * 1 47 1 15
89 - * ,-----------------------------------------------------------.
79 + * ,---+------------------------------+------+-----------------.
90 80 * | 0 | offset (sm_shift units) | type | run |
91 - * `-----------------------------------------------------------'
81 + * `---+------------------------------+------+-----------------'
92 82 * 63 62 17 16 15 0
83 + *
84 + * special entry
85 + *
86 + * 1 1 6 56
87 + * ,---+---+----------+----------------------------------------.
88 + * | 1 | 1 | action | <action specific> |
89 + * `---+---+----------+----------------------------------------'
90 + * 63 62 61 56 55 0
91 + *
92 + * debug entry
93 + *
94 + * 1 1 2 10 50
95 + * ,---+---+--------+----------+-------------------------------.
96 + * | 1 | 0 | action | syncpass | txg (lower bits) |
97 + * `---+---+--------+----------+-------------------------------'
98 + * 63 62 61 60 59 50 49 0
93 99 */
94 100
95 101 /* All this stuff takes and returns bytes */
96 102 #define SM_RUN_DECODE(x) (BF64_DECODE(x, 0, 15) + 1)
97 103 #define SM_RUN_ENCODE(x) BF64_ENCODE((x) - 1, 0, 15)
98 104 #define SM_TYPE_DECODE(x) BF64_DECODE(x, 15, 1)
99 105 #define SM_TYPE_ENCODE(x) BF64_ENCODE(x, 15, 1)
100 106 #define SM_OFFSET_DECODE(x) BF64_DECODE(x, 16, 47)
101 107 #define SM_OFFSET_ENCODE(x) BF64_ENCODE(x, 16, 47)
102 -#define SM_DEBUG_DECODE(x) BF64_DECODE(x, 63, 1)
103 -#define SM_DEBUG_ENCODE(x) BF64_ENCODE(x, 63, 1)
104 108
109 +#define SM_IS_SPECIAL(x) (BF64_DECODE(x, 62, 2) == 3)
110 +#define SM_SPECIAL_ENCODE() BF64_ENCODE(3, 62, 2)
111 +#define SM_IS_DEBUG(x) (BF64_DECODE(x, 62, 2) == 2)
112 +#define SM_DEBUG_ENCODE() BF64_ENCODE(2, 62, 2)
113 +
114 +#define SM_SPECIAL_ACTION_DECODE(x) BF64_DECODE(x, 56, 6)
115 +#define SM_SPECIAL_ACTION_ENCODE(x) BF64_ENCODE(x, 56, 6)
116 +
105 117 #define SM_DEBUG_ACTION_DECODE(x) BF64_DECODE(x, 60, 3)
106 118 #define SM_DEBUG_ACTION_ENCODE(x) BF64_ENCODE(x, 60, 3)
107 -
108 119 #define SM_DEBUG_SYNCPASS_DECODE(x) BF64_DECODE(x, 50, 10)
109 120 #define SM_DEBUG_SYNCPASS_ENCODE(x) BF64_ENCODE(x, 50, 10)
110 -
111 121 #define SM_DEBUG_TXG_DECODE(x) BF64_DECODE(x, 0, 50)
112 122 #define SM_DEBUG_TXG_ENCODE(x) BF64_ENCODE(x, 0, 50)
113 123
114 124 #define SM_RUN_MAX SM_RUN_DECODE(~0ULL)
115 125
116 126 #define SM_ALLOC 0x0
117 127 #define SM_FREE 0x1
118 128
129 +#define SM_FOLD 0x01
130 +
119 131 /*
120 132 * The data for a given space map can be kept on blocks of any size.
121 133 * Larger blocks entail fewer i/o operations, but they also cause the
122 134 * DMU to keep more data in-core, and also to waste more i/o bandwidth
123 135 * when only a few blocks have changed since the last transaction group.
124 136 * This could use a lot more research, but for now, set the freelist
125 137 * block size to 4k (2^12).
126 138 */
127 139 #define SPACE_MAP_BLOCKSHIFT 12
128 140
129 141 typedef void space_map_func_t(space_map_t *sm, uint64_t start, uint64_t size);
130 142
131 143 extern void space_map_create(space_map_t *sm, uint64_t start, uint64_t size,
132 144 uint8_t shift, kmutex_t *lp);
133 145 extern void space_map_destroy(space_map_t *sm);
134 146 extern void space_map_add(space_map_t *sm, uint64_t start, uint64_t size);
135 147 extern void space_map_remove(space_map_t *sm, uint64_t start, uint64_t size);
136 148 extern int space_map_contains(space_map_t *sm, uint64_t start, uint64_t size);
137 149 extern void space_map_vacate(space_map_t *sm,
138 150 space_map_func_t *func, space_map_t *mdest);
139 151 extern void space_map_walk(space_map_t *sm,
140 152 space_map_func_t *func, space_map_t *mdest);
141 153 extern void space_map_excise(space_map_t *sm, uint64_t start, uint64_t size);
142 154 extern void space_map_union(space_map_t *smd, space_map_t *sms);
143 155
144 156 extern void space_map_load_wait(space_map_t *sm);
145 157 extern int space_map_load(space_map_t *sm, space_map_ops_t *ops,
146 158 uint8_t maptype, space_map_obj_t *smo, objset_t *os);
147 159 extern void space_map_unload(space_map_t *sm);
148 160
149 161 extern uint64_t space_map_alloc(space_map_t *sm, uint64_t size);
150 162 extern void space_map_claim(space_map_t *sm, uint64_t start, uint64_t size);
151 163 extern void space_map_free(space_map_t *sm, uint64_t start, uint64_t size);
152 164
153 165 extern void space_map_sync(space_map_t *sm, uint8_t maptype,
154 166 space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx);
155 167 extern void space_map_truncate(space_map_obj_t *smo,
156 168 objset_t *os, dmu_tx_t *tx);
157 169
158 170 #ifdef __cplusplus
159 171 }
160 172 #endif
161 173
162 174 #endif /* _SYS_SPACE_MAP_H */
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