Am 05.02.2013 16:12, schrieb Markus Armbruster: > Stefan Hajnoczi <stefa...@redhat.com> writes: > >> Linux block devices can be set read-only with "blockdev --setro >> <device>". The same thing can be done for LVM volumes using "lvchange >> --permission r <volume>". This read-only setting is independent of >> device node permissions. Therefore the device can still be opened >> O_RDWR but actual writes will fail. >> >> This results in odd behavior for QEMU. bdrv_open() is supposed to fail >> if a read-only image is being opened with BDRV_O_RDWR. By not failing >> for Linux block devices, the guest boots up but every write produces an >> I/O error. >> >> This patch checks whether the block device is read-only so that Linux >> block devices behave like regular files. >> >> Reported-by: Sibiao Luo <s...@redhat.com> >> Suggested-by: Paolo Bonzini <pbonz...@redhat.com> >> Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com> > > Reviewed-by: Markus Armbruster <arm...@redhat.com>
Thanks, applied to the block branch. Kevin
