On Wed, Aug 29, 2012 at 9:15 PM, Frederick Grose <fgrose@xxxxxxxxx> wrote:
> commit d0d4f29cdd0a0e6dd1170965decb282ef5511746
> Author: Frederick Grose <fgrose@xxxxxxxxxxxxx>
> Date: Wed Aug 29 21:02:07 2012 -0400
>
> Don't truncate the overlay file on a reset.
>
> diff --git a/modules.d/90dmsquash-live/dmsquash-live-root.sh
> b/modules.d/90dmsquash-live/dmsquash-live-root.sh
> index f8bfca6..62340a5 100755
> --- a/modules.d/90dmsquash-live/dmsquash-live-root.sh
> +++ b/modules.d/90dmsquash-live/dmsquash-live-root.sh
> @@ -98,7 +98,7 @@ do_live_overlay() {
> if [ -f /run/initramfs/overlayfs$pathspec -a -w
> /run/initramfs/overlayfs$pathspec ]; then
> losetup $OVERLAY_LOOPDEV /run/initramfs/overlayfs$pathspec
> if [ -n "$reset_overlay" ]; then
> - dd if=/dev/zero of=$OVERLAY_LOOPDEV bs=64k count=1 2>/dev/null
> + dd if=/dev/zero of=$OVERLAY_LOOPDEV bs=64k count=1
> conv=notrunc 2>/dev/null
> fi
> setup="yes"
> fi
Void the above patch.
I don't know why the overlay is NOT truncated without the notrunc
conversion argument to dd.
However, my testing shows that this bug is fixed by using the fsync
conversion argument,
https://bugzilla.redhat.com/show_bug.cgi?id=832884
A revised patch file is attached to the bug ticket.
--Fred
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