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

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46 * must provide external locking if required.
47 */
48typedef struct range_tree {
49 avl_tree_t rt_root; /* offset-ordered segment AVL tree */
50 uint64_t rt_space; /* sum of all segments in the map */
51 range_tree_ops_t *rt_ops;
52 void *rt_arg;
53
54 /*
55 * The rt_histogram maintains a histogram of ranges. Each bucket,
56 * rt_histogram[i], contains the number of ranges whose size is:
57 * 2^i <= size of range in bytes < 2^(i+1)
58 */
59 uint64_t rt_histogram[RANGE_TREE_HISTOGRAM_SIZE];
60} range_tree_t;
61
62typedef struct range_seg {
63 avl_node_t rs_node; /* AVL node */
64 avl_node_t rs_pp_node; /* AVL picker-private node */
65 uint64_t rs_start; /* starting offset of this segment */
66 uint64_t rs_end; /* ending offset (non-inclusive) */
67} range_seg_t;
68
69struct range_tree_ops {
70 void (*rtop_create)(range_tree_t *rt, void *arg);
71 void (*rtop_destroy)(range_tree_t *rt, void *arg);
72 void (*rtop_add)(range_tree_t *rt, range_seg_t *rs, void *arg);
73 void (*rtop_remove)(range_tree_t *rt, range_seg_t *rs, void *arg);
74 void (*rtop_vacate)(range_tree_t *rt, void *arg);
75};
76
77typedef void range_tree_func_t(void *arg, uint64_t start, uint64_t size);
78
79void range_tree_init(void);
80void range_tree_fini(void);
81range_tree_t *range_tree_create(range_tree_ops_t *ops, void *arg);
82void range_tree_destroy(range_tree_t *rt);
83boolean_t range_tree_contains(range_tree_t *rt, uint64_t start, uint64_t size);
84uint64_t range_tree_space(range_tree_t *rt);
85boolean_t range_tree_is_empty(range_tree_t *rt);
86void range_tree_verify(range_tree_t *rt, uint64_t start, uint64_t size);
87void range_tree_swap(range_tree_t **rtsrc, range_tree_t **rtdst);
88void range_tree_stat_verify(range_tree_t *rt);
89
90void range_tree_add(void *arg, uint64_t start, uint64_t size);
91void range_tree_remove(void *arg, uint64_t start, uint64_t size);
92void range_tree_clear(range_tree_t *rt, uint64_t start, uint64_t size);
93
94void range_tree_vacate(range_tree_t *rt, range_tree_func_t *func, void *arg);
95void range_tree_walk(range_tree_t *rt, range_tree_func_t *func, void *arg);
96
97#ifdef __cplusplus
98}
99#endif
100
101#endif /* _SYS_RANGE_TREE_H */