Re: problem with dd for floppy under 2.4.0

Jamie Lokier (lk@tantalophile.demon.co.uk)
Thu, 25 Jan 2001 19:27:21 +0100

Mikael Pettersson wrote:
> There's a known bug in dd where it incorrectly attempts to truncate
> the output file even though it's a block device.

dd also attempts to truncate a character device, therefore fails in the
same way.

The kernel should probably return EINVAL for this rather than EPERM.

> In kernels older
> than 2.4.0-test10 or so it got away with this, but now the kernel
> correctly returns an error.
>
> Use the 'conv=notrunc' option to dd to fix this, i.e.
>
> dd if=rootfs.gz of=/dev/fd0 bs=1k conv=notrunc seek=XXX

If only it were so easy to fix the program that calls dd...

-- Jamie
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