1 /*
2 * CDDL HEADER START
3 *
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.
7 *
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.
12 *
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]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /*
27 * Copyright (c) 2013 by Delphix. All rights reserved.
28 */
29
30 #ifndef _SYS_RANGE_TREE_H
31 #define _SYS_RANGE_TREE_H
32
33 #include <sys/avl.h>
34 #include <sys/dmu.h>
35
36 #ifdef __cplusplus
37 extern "C" {
38 #endif
39
40 #define RANGE_TREE_HISTOGRAM_SIZE 64
41
42 typedef struct range_tree_ops range_tree_ops_t;
43
44 typedef struct range_tree {
45 avl_tree_t rt_root; /* offset-ordered segment AVL tree */
46 uint64_t rt_space; /* sum of all segments in the map */
47 range_tree_ops_t *rt_ops;
48 void *rt_arg;
49
50 /*
51 * The rt_histogram maintains a histogram of ranges. Each bucket,
52 * rt_histogram[i], contains the number of ranges whose size is:
53 * 2^i <= size of range in bytes < 2^(i+1)
54 */
55 uint64_t rt_histogram[RANGE_TREE_HISTOGRAM_SIZE];
56 kmutex_t *rt_lock; /* pointer to lock that protects map */
57 } range_tree_t;
58
59 typedef struct range_seg {
60 avl_node_t rs_node; /* AVL node */
61 avl_node_t rs_pp_node; /* AVL picker-private node */
62 uint64_t rs_start; /* starting offset of this segment */
63 uint64_t rs_end; /* ending offset (non-inclusive) */
64 } range_seg_t;
65
66 struct range_tree_ops {
67 void (*rtop_create)(range_tree_t *rt, void *arg);
68 void (*rtop_destroy)(range_tree_t *rt, void *arg);
69 void (*rtop_add)(range_tree_t *rt, range_seg_t *rs, void *arg);
70 void (*rtop_remove)(range_tree_t *rt, range_seg_t *rs, void *arg);
71 void (*rtop_vacate)(range_tree_t *rt, void *arg);
72 };
73
74 typedef void range_tree_func_t(void *arg, uint64_t start, uint64_t size);
75
76 void range_tree_init(void);
77 void range_tree_fini(void);
78 range_tree_t *range_tree_create(range_tree_ops_t *ops, void *arg, kmutex_t *lp);
79 void range_tree_destroy(range_tree_t *rt);
80 boolean_t range_tree_contains(range_tree_t *rt, uint64_t start, uint64_t size);
81 uint64_t range_tree_space(range_tree_t *rt);
82 void range_tree_verify(range_tree_t *rt, uint64_t start, uint64_t size);
83 void range_tree_swap(range_tree_t **rtsrc, range_tree_t **rtdst);
84 void range_tree_stat_verify(range_tree_t *rt);
85
86 void range_tree_add(void *arg, uint64_t start, uint64_t size);
87 void range_tree_remove(void *arg, uint64_t start, uint64_t size);
88
89 void range_tree_vacate(range_tree_t *rt, range_tree_func_t *func, void *arg);
90 void range_tree_walk(range_tree_t *rt, range_tree_func_t *func, void *arg);
91
92 #ifdef __cplusplus
93 }
94 #endif
95
96 #endif /* _SYS_RANGE_TREE_H */