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
|
/*
* This file is part of the Distributed Network Block Device 3
*
* Copyright(c) 2011-2012 Johann Latocha <johann@latocha.de>
*
* This file may be licensed under the terms of of the
* GNU General Public License Version 2 (the ``GPL'').
*
* Software distributed under the License is distributed
* on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
* express or implied. See the GPL for the specific language
* governing rights and limitations.
*
* You should have received a copy of the GPL along with this
* program. If not, go to http://www.gnu.org/licenses/gpl.html
* or write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdlib.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <pthread.h>
#include <string.h>
#include "server.h"
#include "utils.h"
void dnbd3_load_config(char *file)
{
int fd;
gint i;
GKeyFile* gkf;
gkf = g_key_file_new();
if (!g_key_file_load_from_file(gkf, file, G_KEY_FILE_NONE, NULL))
{
printf("ERROR: Config file not found: %s\n", file);
exit(EXIT_FAILURE);
}
gchar **groups = NULL;
groups = g_key_file_get_groups(gkf, &_num_images);
_images = calloc(_num_images, sizeof(dnbd3_image_t));
for (i = 0; i < _num_images; i++)
{
_images[i].file = g_key_file_get_string(gkf, groups[i], "file", NULL);
_images[i].servers = g_key_file_get_string_list(gkf, groups[i], "servers", &_images[i].num_servers, NULL);
_images[i].vid = g_key_file_get_integer(gkf, groups[i], "vid", NULL);
_images[i].rid = g_key_file_get_integer(gkf, groups[i], "rid", NULL);
_images[i].cache_file = g_key_file_get_string(gkf, groups[i], "cache", NULL);
_images[i].atime = 0;
if (_images[i].num_servers > NUMBER_SERVERS)
printf("WARN: Max allowed servers %i\n", NUMBER_SERVERS);
fd = open(_images[i].file, O_RDONLY);
if (fd > 0)
_images[i].filesize = lseek(fd, 0, SEEK_END);
else
printf("ERROR: Image not found: %s\n", _images[i].file);
close(fd);
if (_images[i].cache_file)
{
// read cache map from file
_images[i].cache_map = calloc(_images[i].filesize >> 15, sizeof(char));
memset(_images[i].cache_map, 0, (_images[i].filesize >> 15) * sizeof(char));
char tmp[strlen(_images[i].cache_file)+4];
strcpy(tmp, _images[i].cache_file);
strcat(tmp, ".map");
fd = open(tmp, O_RDONLY);
if (fd > 0)
read(fd, _images[i].cache_map, (_images[i].filesize >> 15) * sizeof(char));
close(fd);
// open cache file
fd = open(_images[i].cache_file, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
if (fd < 1)
printf("ERROR: Could't create cache file\n");
if (_images[i].filesize != lseek(fd, 0, SEEK_END))
fallocate(fd, 0, 0, _images[i].filesize);
close(fd);
}
}
g_strfreev(groups);
g_key_file_free(gkf);
}
void dnbd3_reload_config(char* config_file_name)
{
int i, fd;
pthread_spin_lock(&_spinlock);
GSList *iterator = NULL;
for (iterator = _dnbd3_clients; iterator; iterator = iterator->next)
{
dnbd3_client_t *client = iterator->data;
pthread_spin_lock(&client->spinlock);
client->image = NULL;
}
// save cache maps
for (i = 0; i < _num_images; i++)
{
if (_images[i].cache_file)
{
char tmp[strlen(_images[i].cache_file)+4];
strcpy(tmp, _images[i].cache_file);
strcat(tmp, ".map");
fd = open(tmp, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
if (fd > 0)
write(fd, _images[i].cache_map, (_images[i].filesize >> 15) * sizeof(char));
close(fd);
}
}
_num_images = 0;
free(_images);
dnbd3_load_config(config_file_name);
for (iterator = _dnbd3_clients; iterator; iterator = iterator->next)
{
dnbd3_client_t *client = iterator->data;
pthread_spin_unlock(&client->spinlock);
}
pthread_spin_unlock(&_spinlock);
}
dnbd3_image_t* dnbd3_get_image(int vid, int rid)
{
int i, max = 0;
dnbd3_image_t *result = NULL;
for (i = 0; i < _num_images; ++i)
{
if (rid != 0) // rid was specified
{
if (_images[i].vid == vid && _images[i].rid == rid)
result = &_images[i];
}
else // search max. rid available
{
if (_images[i].vid == vid && _images[i].rid > max)
{
result = &_images[i];
max = _images[i].rid;
}
}
}
return result;
}
void dnbd3_handle_sigpipe(int signum)
{
printf("ERROR: SIGPIPE received!\n");
}
void dnbd3_handle_sigterm(int signum)
{
printf("INFO: SIGTERM or SIGINT received!\n");
dnbd3_cleanup();
}
|
