/*
* 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].group = malloc(strlen(groups[i]));
strcpy(_images[i].group, groups[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].serverss = g_key_file_get_string(gkf, groups[i], "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 file 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;
}
for (i = 0; i < _num_images; i++)
{
// save cache maps
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);
}
free(_images[i].group);
free(_images[i].file);
free(_images[i].servers);
free(_images[i].serverss);
free(_images[i].cache_file);
free(_images[i].cache_map);
}
_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);
}
int dnbd3_add_image(dnbd3_image_t *image, char *file)
{
FILE* f = fopen(image->file,"r");
if (f == NULL)
{
printf("ERROR: Image file not found: %s\n", image->file);
return ERROR_FILE_NOT_FOUND;
}
fclose (f);
dnbd3_image_t* tmp = dnbd3_get_image(image->vid, image->rid);
if (image->rid == 0)
{
if(tmp)
image->rid = tmp->rid +1;
else
image->rid = 1;
} else if (tmp)
{
printf("ERROR: Image already exists (%d,%d)\n", image->vid, image->rid);
return ERROR_IMAGE_ALREADY_EXISTS;
}
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);
}
g_key_file_set_integer(gkf, image->group, "vid", image->vid);
g_key_file_set_integer(gkf, image->group, "rid", image->rid);
g_key_file_set_string(gkf, image->group, "file", image->file);
g_key_file_set_string(gkf, image->group, "servers", image->serverss);
g_key_file_set_string(gkf, image->group, "cache", image->cache_file);
gchar* data = g_key_file_to_data(gkf, NULL, NULL);
f = fopen(file,"w");
if (f)
{
fputs((char*) data, f);
fclose(f);
g_free(data);
g_key_file_free(gkf);
return 0;
}
else
{
g_free(data);
g_key_file_free(gkf);
printf("ERROR: Config file is not writable: %s\n", file);
return ERROR_CONFIG_FILE_PERMISSIONS;
}
}
int dnbd3_del_image(dnbd3_image_t *image, char *file)
{
if (image->rid == 0)
{
printf("ERROR: Delete with rid=0 is not allowed\n");
return ERROR_RID;
}
dnbd3_image_t* tmp = dnbd3_get_image(image->vid, image->rid);
if (!tmp)
{
printf("ERROR: Image not found: (%d,%d)\n", image->vid, image->rid);
return ERROR_IMAGE_NOT_FOUND;
}
GSList *iterator = NULL;
for (iterator = _dnbd3_clients; iterator; iterator = iterator->next)
{
dnbd3_client_t *client = iterator->data;
if (tmp == client->image)
{
printf("ERROR: Delete is not allowed, image is in use (%d,%d)\n", tmp->vid, tmp->rid);
return ERROR_IMAGE_IN_USE;
}
}
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);
}
g_key_file_remove_group(gkf, tmp->group, NULL);
gchar* data = g_key_file_to_data(gkf, NULL, NULL);
FILE* f = fopen(file,"w");
if (f)
{
fputs((char*) data, f);
fclose(f);
g_free(data);
g_key_file_free(gkf);
// TODO: unlink image file
return 0;
}
else
{
g_free(data);
g_key_file_free(gkf);
printf("ERROR: Config file is not writable: %s\n", file);
return ERROR_CONFIG_FILE_PERMISSIONS;
}
}
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();
}
