|
Description
|
For fixing 6623175, we need to convert the size from MB to cylinder. The size of the cylinder can be calculated by getting the disk geometry attributes DM_NSECT, and DM_NHEADS. libdiskmgt provides these attributes correctly for internal disks. But there are not available for removable USB disks.
Looking at the libdiskmgt:media.c code, it uses DKIOCGGEOM to get DM_NSECT, DM_NHEADS and bunch of other attributes for sparc and X86. It fails for removable USB stick in X86. So it should use DKIOCG_PHYGEOM to get all X86 disk attributes. Check the output the following program. It uses both DKIOCGGEOM and DKIOCG_PHYGEOM
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/param.h>
#include <sys/types.h>
#include <libnvpair.h>
#include <sys/dkio.h>
main(char **argv, int argc)
{
struct dk_geom dkg;
char path[1024];
int fd;
if (argc < 2) {
printf("Usage: %s <raw disk path>\n", argv[0]);
exit (1);
}
if ((fd = open(argv[1], O_RDONLY|O_NDELAY)) < 0) {
printf("Usage: %s <raw disk path>\n", argv[0]);
exit (2);
}
if (ioctl(fd, DKIOCGGEOM, &dkg) < 0) {
printf("DKIOCGGEOM failed for %s\n", argv[1]);
return;
}
printf("\nResults using DKIOCGGEOM \n");
printf("DM_NHEADS = %d\n", dkg.dkg_nhead);
printf("DM_NSECT = %d\n", dkg.dkg_nsect);
if (ioctl(fd, DKIOCG_PHYGEOM, &dkg) < 0) {
printf("DKIOCGGEOM failed for %s\n", argv[1]);
return;
}
printf("\nResults using DKIOCG_PHYGEOM \n");
printf("DM_NHEADS = %d\n", dkg.dkg_nhead);
printf("DM_NSECT = %d\n", dkg.dkg_nsect);
}
------------------------------------------------------------------------------------
# ./dkiotest /dev/rdsk/c5t0d0p0
DKIOCGGEOM failed for /dev/rdsk/c5t0d0p0
Results using DKIOCG_PHYGEOM
DM_NHEADS = 128
DM_NSECT = 32
The data looks correct because the cylinder size is 4096 blocks (DM_NHEADS*DM_NSECT) and it is the same size reported by fdisk.
# fdisk /dev/rdsk/c5t0d0p0
Total disk size is 984 cylinders
Cylinder size is 4096 (512 byte) blocks
Cylinders
Partition Status Type Start End Length %
========= ====== ============ ===== === ====== ===
1 Solaris2 1 246 246 25
2 Solaris2 247 975 729 74
SELECT ONE OF THE FOLLOWING:
1. Create a partition
2. Specify the active partition
3. Delete a partition
4. Change between Solaris and Solaris2 Partition IDs
5. Exit (update disk configuration and exit)
6. Cancel (exit without updating disk configuration)
*** (#1 of 1): [ UNSAVED ] xxxxx@xxxxx.com
*** (#1 of 1): 2007-10-30 11:53:59 MDT xxxxx@xxxxx.com
|
