On 03/19/2015 01:03 PM, Max Reitz wrote: > This flag is set if write accesses to BDSs managed by the respective > driver may lead to writes beyond the end of the underlying file BDS, > expecting it to increase its size accordingly. > > This behavior, however, is only supported by protocol BDSs having the > BDS.growing flag set. If they do not, emit a warning. > > An example of such a misconfiguration is exporting a qcow2 file using > the reference NBD server implementation, which cannot interpret the > qcow2 format and will thus expose it directly over the network. When > accessing that export with qemu, qemu's qcow2 driver may try to allocate > clusters over the NBD connection, writing to addresses beyond the size > of the NBD export, which will then fail (without the user knowing why, > without this warning). > > Signed-off-by: Max Reitz <mre...@redhat.com> > --- > block.c | 16 ++++++++++++++++ > block/qcow.c | 1 + > block/qcow2.c | 2 ++ > block/qed.c | 1 + > block/vdi.c | 2 ++ > block/vhdx.c | 2 ++ > block/vmdk.c | 1 + > block/vpc.c | 2 ++ > include/block/block_int.h | 4 ++++ > 9 files changed, 31 insertions(+) >
Reviewed-by: Eric Blake <ebl...@redhat.com> -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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