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lib: [blkdev.c] add blkdev_get_physector_size() 

This function uses the BLKPBSZGET ioctl to get the physical block size
of the device.

Signed-off-by: Davidlohr Bueso <dave@gnu.org>
Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Davidlohr Bueso 2011-06-20 22:51:47 -04:00 committed by Karel Zak
parent 5dfc984392
commit 0e75337c31
2 changed files with 36 additions and 4 deletions
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3
include/blkdev.h
View File

@ -95,4 +95,7 @@ int blkdev_get_sector_size(int fd, int *sector_size);
/* specifies whether or not the device is misaligned */
int blkdev_is_misaligned(int fd);
/* get physical block device size */
int blkdev_get_physector_size(int fd, int *sector_size);
#endif /* BLKDEV_H */

37
lib/blkdev.c
View File

@ -204,6 +204,31 @@ blkdev_get_sector_size(int fd, int *sector_size)
#endif
}
/*
* Get physical block device size. The BLKPBSZGET is supported since Linux
* 2.6.32. For old kernels is probably the best to assume that physical sector
* size is the same as logical sector size.
*
* Example:
*
* rc = blkdev_get_physector_size(fd, &physec);
* if (rc || physec == 0) {
* rc = blkdev_get_sector_size(fd, &physec);
* if (rc)
* physec = DEFAULT_SECTOR_SIZE;
* }
*/
int blkdev_get_physector_size(int fd, int *sector_size)
{
#ifdef BLKPBSZGET
if (ioctl(fd, BLKPBSZGET, &sector_size) >= 0)
return 0;
return -1;
#else
*sector_size = DEFAULT_SECTOR_SIZE;
return 0;
#endif
}
/*
* Return the alignment status of a device
@ -221,6 +246,7 @@ int blkdev_is_misaligned(int fd)
#endif
}
#ifdef TEST_PROGRAM
#include <stdio.h>
#include <stdlib.h>
@ -230,7 +256,7 @@ main(int argc, char **argv)
{
unsigned long long bytes;
unsigned long long sectors;
int sector_size;
int sector_size, phy_sector_size;
int fd;
if (argc != 2) {
@ -247,10 +273,13 @@ main(int argc, char **argv)
err(EXIT_FAILURE, "blkdev_get_sectors() failed");
if (blkdev_get_sector_size(fd, &sector_size) < 0)
err(EXIT_FAILURE, "blkdev_get_sector_size() failed");
if (blkdev_get_physector_size(fd, &phy_sector_size) < 0)
err(EXIT_FAILURE, "blkdev_get_physector_size() failed");
printf("bytes %llu\n", bytes);
printf("sectors %llu\n", sectors);
printf("sectorsize %d\n", sector_size);
printf(" bytes: %llu\n", bytes);
printf(" sectors: %llu\n", sectors);
printf(" sector size: %d\n", sector_size);
printf("phy-sector size: %d\n", phy_sector_size);
return EXIT_SUCCESS;
}