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/*
* Copyright (C) 2001 Sistina Software
*
* lvm is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* lvm 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 GNU CC; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#include "dbg_malloc.h"
#include "log.h"
#include "dev-cache.h"
#include "filter.h"
#include "lvm-string.h"
#include <stdlib.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <linux/kdev_t.h>
#define NUMBER_OF_MAJORS 256
typedef struct {
char *name;
int max_partitions;
} device_info_t;
static int _md_major = -1;
static device_info_t device_info[] = {
{"ide", 16}, /* IDE disk */
{"sd", 16}, /* SCSI disk */
{"md", 16}, /* Multiple Disk driver (SoftRAID) */
{"loop", 16}, /* Loop device */
{"dasd", 4}, /* DASD disk (IBM S/390, zSeries) */
{"dac960", 8}, /* DAC960 */
{"nbd", 16}, /* Network Block Device */
{"ida", 16}, /* Compaq SMART2 */
{"cciss", 16}, /* Compaq CCISS array */
{"ubd", 16}, /* User-mode virtual block device */
{"ataraid", 16}, /* ATA Raid */
{NULL, 0}
};
static int *scan_proc_dev(const char *proc);
static int passes_lvm_type_device_filter(struct dev_filter *f,
struct device *dev)
{
int fd;
const char *name = dev_name(dev);
/* Is this a recognised device type? */
if (!(((int *) f->private)[MAJOR(dev->dev)]))
return 0;
/* Check it's accessible */
if ((fd = open(name, O_RDONLY)) < 0) {
log_debug("Unable to open %s: %s", name, strerror(errno));
return 0;
}
close(fd);
return 1;
}
struct dev_filter *lvm_type_filter_create(const char *proc)
{
struct dev_filter *f;
if (!(f = dbg_malloc(sizeof(struct dev_filter)))) {
log_error("LVM type filter allocation failed");
return NULL;
}
f->passes_filter = passes_lvm_type_device_filter;
f->destroy = lvm_type_filter_destroy;
if (!(f->private = scan_proc_dev(proc)))
return NULL;
return f;
}
int md_major(void)
{
return _md_major;
}
void lvm_type_filter_destroy(struct dev_filter *f)
{
dbg_free(f->private);
dbg_free(f);
return;
}
static int *scan_proc_dev(const char *proc)
{
char line[80];
char proc_devices[PATH_MAX];
FILE *pd = NULL;
int ret = 0;
int i, j = 0;
int line_maj = 0;
int blocksection = 0;
int dev_len = 0;
int *max_partitions_by_major;
if (!(max_partitions_by_major =
dbg_malloc(sizeof(int) * NUMBER_OF_MAJORS))) {
log_error("Filter failed to allocate max_partitions_by_major");
return NULL;
}
if (lvm_snprintf(proc_devices, sizeof(proc_devices),
"%s/devices", proc) < 0) {
log_error("Failed to create /proc/devices string");
return NULL;
}
if (!(pd = fopen(proc_devices, "r"))) {
log_sys_error("fopen", proc_devices);
return NULL;
}
memset(max_partitions_by_major, 0, sizeof(int) * NUMBER_OF_MAJORS);
while (fgets(line, 80, pd) != NULL) {
i = 0;
while (line[i] == ' ' && line[i] != '\0')
i++;
/* If it's not a number it may be name of section */
line_maj = atoi(((char *) (line + i)));
if (!line_maj) {
blocksection = (line[i] == 'B') ? 1 : 0;
continue;
}
/* We only want block devices ... */
if (!blocksection)
continue;
/* Find the start of the device major name */
while (line[i] != ' ' && line[i] != '\0')
i++;
while (line[i] == ' ' && line[i] != '\0')
i++;
/* Look for md device */
if (!strncmp("md", line + i, 2) && isspace(*(line + i + 2)))
_md_major = line_maj;
/* Go through the valid device names and if there is a
match store max number of partitions */
for (j = 0; device_info[j].name != NULL; j++) {
dev_len = strlen(device_info[j].name);
if (dev_len <= strlen(line + i)
&& !strncmp(device_info[j].name, line + i, dev_len)
&& (line_maj < NUMBER_OF_MAJORS)) {
max_partitions_by_major[line_maj] =
device_info[j].max_partitions;
ret++;
break;
}
}
}
fclose(pd);
return max_partitions_by_major;
}
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