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SubjectRe: BLKSSZGET change will break fdisk
On Mon, Oct 16, 2000 at 10:38:41PM +0200, Roman Zippel wrote:

> > [now that you make me look at this, there is a flaw in fdisk there;
> > fixed in 2.10p]
> BLKSSZGET isn't defined for fdisk.c? :)

Indeed :-)
The current code looks like this:

- BLKSSZGET added in common.h
- in fdisk.c added linux_version_code() similar to the one in nfsmount.c.
- in fdisk.c sector_size code:

static void
get_sectorsize(int fd) {
#if defined(BLKSSZGET)
if (!user_set_sector_size &&
linux_version_code() >= MAKE_VERSION(2,3,3)) {
int arg;
if (ioctl(fd, BLKSSZGET, &arg) == 0)
sector_size = arg;
if (sector_size != DEFAULT_SECTOR_SIZE)
printf(_("Note: sector size is %d (not %d)\n"),
sector_size, DEFAULT_SECTOR_SIZE);
/* maybe the user specified it; and otherwise we still
have the DEFAULT_SECTOR_SIZE default */

> BTW the problem is a bit bigger, I tried to partition a 4GB mo disk, what
> horribly breaks with current fdisk under 2.2. It results in an odd
> partition offset and you can't access any partition. So I need a fixed
> fdisk. As quick hack I simply reused BLKSSZGET, but now I have a fdisk,
> that only works with a fixed kernel.

Instead of the above, just use

static void
get_sectorsize(int fd) {

and use a -b option to specify the sector size.

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