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
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* Copyright (C) 2007 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 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 for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include "kerncompat.h"
#include "extent-cache.h"
struct cache_extent_search_range {
u64 start;
u64 size;
};
void cache_tree_init(struct cache_tree *tree)
{
tree->root = RB_ROOT;
}
static int cache_tree_comp_range(struct rb_node *node, void *data)
{
struct cache_extent *entry;
struct cache_extent_search_range *range;
range = (struct cache_extent_search_range *)data;
entry = rb_entry(node, struct cache_extent, rb_node);
if (entry->start + entry->size <= range->start)
return 1;
else if (range->start + range->size <= entry->start)
return -1;
else
return 0;
}
static int cache_tree_comp_nodes(struct rb_node *node1, struct rb_node *node2)
{
struct cache_extent *entry;
struct cache_extent_search_range range;
entry = rb_entry(node2, struct cache_extent, rb_node);
range.start = entry->start;
range.size = entry->size;
return cache_tree_comp_range(node1, (void *)&range);
}
struct cache_extent *alloc_cache_extent(u64 start, u64 size)
{
struct cache_extent *pe = malloc(sizeof(*pe));
if (!pe)
return pe;
pe->start = start;
pe->size = size;
return pe;
}
int insert_cache_extent(struct cache_tree *tree, struct cache_extent *pe)
{
return rb_insert(&tree->root, &pe->rb_node, cache_tree_comp_nodes);
}
int add_cache_extent(struct cache_tree *tree, u64 start, u64 size)
{
struct cache_extent *pe = alloc_cache_extent(start, size);
int ret;
if (!pe) {
fprintf(stderr, "memory allocation failed\n");
exit(1);
}
ret = insert_cache_extent(tree, pe);
if (ret)
free(pe);
return ret;
}
struct cache_extent *find_cache_extent(struct cache_tree *tree,
u64 start, u64 size)
{
struct rb_node *node;
struct cache_extent *entry;
struct cache_extent_search_range range;
range.start = start;
range.size = size;
node = rb_search(&tree->root, &range, cache_tree_comp_range, NULL);
if (!node)
return NULL;
entry = rb_entry(node, struct cache_extent, rb_node);
return entry;
}
struct cache_extent *find_first_cache_extent(struct cache_tree *tree, u64 start)
{
struct rb_node *next;
struct rb_node *node;
struct cache_extent *entry;
struct cache_extent_search_range range;
range.start = start;
range.size = 1;
node = rb_search(&tree->root, &range, cache_tree_comp_range, &next);
if (!node)
node = next;
if (!node)
return NULL;
entry = rb_entry(node, struct cache_extent, rb_node);
return entry;
}
struct cache_extent *first_cache_extent(struct cache_tree *tree)
{
struct rb_node *node = rb_first(&tree->root);
if (!node)
return NULL;
return rb_entry(node, struct cache_extent, rb_node);
}
struct cache_extent *prev_cache_extent(struct cache_extent *pe)
{
struct rb_node *node = rb_prev(&pe->rb_node);
if (!node)
return NULL;
return rb_entry(node, struct cache_extent, rb_node);
}
struct cache_extent *next_cache_extent(struct cache_extent *pe)
{
struct rb_node *node = rb_next(&pe->rb_node);
if (!node)
return NULL;
return rb_entry(node, struct cache_extent, rb_node);
}
void remove_cache_extent(struct cache_tree *tree, struct cache_extent *pe)
{
rb_erase(&pe->rb_node, &tree->root);
}
void cache_tree_free_extents(struct cache_tree *tree,
free_cache_extent free_func)
{
struct cache_extent *ce;
while ((ce = first_cache_extent(tree))) {
remove_cache_extent(tree, ce);
free_func(ce);
}
}
|
