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#include <sys/types.h>
#include <sys/ioctl.h>
#include "blkdev.h"
#include "linux_version.h"
/* get size in bytes */
int
blkdev_get_size(int fd, unsigned long long *bytes)
{
unsigned long size;
int ver = get_linux_version();
/* kernels 2.4.15-2.4.17, had a broken BLKGETSIZE64 */
if (ver >= KERNEL_VERSION (2,6,0) ||
(ver >= KERNEL_VERSION (2,4,18) && ver < KERNEL_VERSION (2,5,0))) {
if (ioctl(fd, BLKGETSIZE64, bytes) >= 0)
return 0;
}
if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
*bytes = ((unsigned long long)size << 9);
return 0;
}
return -1;
}
/* get 512-byte sector count */
int
blkdev_get_sectors(int fd, unsigned long long *sectors)
{
unsigned long long bytes;
if (blkdev_get_size(fd, &bytes) == 0) {
*sectors = (bytes >> 9);
return 0;
}
return -1;
}
/* get hardware sector size */
int
blkdev_get_sector_size(int fd, int *sector_size)
{
if (get_linux_version() < KERNEL_VERSION(2,3,3)) {
*sector_size = DEFAULT_SECTOR_SIZE;
return 0;
}
if (ioctl(fd, BLKSSZGET, sector_size) >= 0)
return 0;
return -1;
}
#ifdef MAIN_TEST_BLKDEV
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <err.h>
int
main(int argc, char **argv)
{
unsigned long long bytes;
unsigned long long sectors;
int sector_size;
int fd;
if (argc != 2) {
fprintf(stderr, "usage: %s device\n", argv[0]);
exit(EXIT_FAILURE);
}
if ((fd = open(argv[1], O_RDONLY)) < 0)
err(EXIT_FAILURE, "open %s failed", argv[1]);
if (blkdev_get_size(fd, &bytes) < 0)
err(EXIT_FAILURE, "blkdev_get_size() failed");
if (blkdev_get_sectors(fd, §ors) < 0)
err(EXIT_FAILURE, "blkdev_get_sectors() failed");
if (blkdev_get_sector_size(fd, §or_size) < 0)
err(EXIT_FAILURE, "blkdev_get_sector_size() failed");
printf("bytes %llu\n", bytes);
printf("sectors %llu\n", sectors);
printf("sectorsize %d\n", sector_size);
return EXIT_SUCCESS;
}
#endif /* TEST_PROGRAM */
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