08-31-2008
How are you creating the partitions? I think there was a limitation around 15G for primary partition(s). But if you are deleting everything this is not the case.
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dkio(4) Kernel Interfaces Manual dkio(4)
Name
dkio - disk interface
Syntax
#include <sys/fs.h>
#include <sys/ioctl.h>
Description
This section describes the ioctl (input/output controller) codes for all disk drivers. The basic ioctl (input/output controller) format
is:
#include <sys/fs.h>
#include <sys/ioctl.h>
ioctl(fildes, code, arg)
struct pt *arg;
The applicable codes are:
DIOCGETPT Indicates to the driver to store the information in the current partition table in the address pointed to by arg. The file
descriptor must be opened on the raw partitions, a or c.
DIOCGETPT does not change the partition table, but it does provide access to the partition table information.
DIOCSETPT Indicates to the driver to modify the current partition table with the information pointed to by arg.
The file descriptor must be opened on the raw partitions, a or c.
If the a or c partition is not mounted, only the partition table in the driver is modified. This temporarily modifies the
partition table of the disk. The modifications are overwritten with the default table when the disk is turned off and on.
If the a or c partition is mounted, both the partition table in the driver and the partition table in the primary
superblock are modified. This permanently modifies the partition table of the disk. This is not recommended. To change a
partition table permanently, use the command.
DIOCDGTPT Indicates to the driver to store the default information of the current partition table in the address pointed to by arg.
The file descriptor must be opened on the raw partitions a or c.
DIOCGETPT does not change the partition table, but it does provide access to the partition table information.
DKIOCGET Allows the user to receive generic disk information as defined in structdevget.
DKIOCACC This code is defined in It is currently unused.
Restrictions
These restrictions apply when using the DIOCSETPT ioctl code:
o You must have superuser privileges.
o You cannot shrink or change the offset of a partition with a file system mounted on it or with an open file descriptor on the entire
partition.
o You cannot change the offset of the a partition.
Examples
This example shows how to use the DIOGETPT ioctl code to print the length and offset of the a partition of an RZ23 disk:
#include <sys/types.h>
#include <sys/param.h>
#include <sys/fs.h>
#include <sys/ioctl.h>
main()
{
struct pt arg;
int fd, i;
/* Open the "a" partition of the disk you want to see */
if ( (fd = open("/dev/rz0a",0)) < 0 ) {
printf("Unable to open device
");
exit(2);
}
/* Get the partition information */
if ( ioctl(fd,DIOCGETPT,&arg) < 0 )
printf("Error in ioctl
");
printf("Length Offset
");
for ( i = 0; i <= 7; i++ ) {
printf("%d %d
",arg.pt_part[i].pi_nblocks,
arg.pt_part[i].pi_blkoff );
}
}
Files
See Also
rz(4), disktab(5), fstab(5), chpt(8), diskpart(8), fsck(8), MAKEDEV(8), mkfs(8), tunefs(8)
RISC dkio(4)