1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/include/interval_tree.h
*
* Author: Huang Wei <huangwei@clusterfs.com>
* Author: Jay Xiong <jinshan.xiong@sun.com>
*/
#ifndef _INTERVAL_H__
#define _INTERVAL_H__
#include "../../include/linux/libcfs/libcfs.h" /* LASSERT. */
struct interval_node {
struct interval_node *in_left;
struct interval_node *in_right;
struct interval_node *in_parent;
unsigned in_color:1,
in_intree:1, /** set if the node is in tree */
in_res1:30;
__u8 in_res2[4]; /** tags, 8-bytes aligned */
__u64 in_max_high;
struct interval_node_extent {
__u64 start;
__u64 end;
} in_extent;
};
enum interval_iter {
INTERVAL_ITER_CONT = 1,
INTERVAL_ITER_STOP = 2
};
static inline int interval_is_intree(struct interval_node *node)
{
return node->in_intree == 1;
}
static inline __u64 interval_low(struct interval_node *node)
{
return node->in_extent.start;
}
static inline __u64 interval_high(struct interval_node *node)
{
return node->in_extent.end;
}
static inline void interval_set(struct interval_node *node,
__u64 start, __u64 end)
{
LASSERT(start <= end);
node->in_extent.start = start;
node->in_extent.end = end;
node->in_max_high = end;
}
/* Rules to write an interval callback.
* - the callback returns INTERVAL_ITER_STOP when it thinks the iteration
* should be stopped. It will then cause the iteration function to return
* immediately with return value INTERVAL_ITER_STOP.
* - callbacks for interval_iterate and interval_iterate_reverse: Every
* nodes in the tree will be set to @node before the callback being called
* - callback for interval_search: Only overlapped node will be set to @node
* before the callback being called.
*/
typedef enum interval_iter (*interval_callback_t)(struct interval_node *node,
void *args);
struct interval_node *interval_insert(struct interval_node *node,
struct interval_node **root);
void interval_erase(struct interval_node *node, struct interval_node **root);
/* Search the extents in the tree and call @func for each overlapped
* extents. */
enum interval_iter interval_search(struct interval_node *root,
struct interval_node_extent *ex,
interval_callback_t func, void *data);
/* Iterate every node in the tree - by reverse order or regular order. */
enum interval_iter interval_iterate(struct interval_node *root,
interval_callback_t func, void *data);
enum interval_iter interval_iterate_reverse(struct interval_node *root,
interval_callback_t func,void *data);
void interval_expand(struct interval_node *root,
struct interval_node_extent *ext,
struct interval_node_extent *limiter);
int interval_is_overlapped(struct interval_node *root,
struct interval_node_extent *ex);
struct interval_node *interval_find(struct interval_node *root,
struct interval_node_extent *ex);
#endif
|
