[Libguestfs] luks filter breaks zeroing

[Richard W.M. Jones]

(More of a note to self to investigate)

$ qemu-img create -f luks --object secret,data=LETMEPASS,id=sec0 -o key-secret=sec0 encrypted.img 100M
Formatting 'encrypted.img', fmt=luks size=104857600 key-secret=sec0
$ rm -f data.img
$ truncate -s 100M data.img
$ nbdkit file encrypted.img --filter=luks passphrase=LETMEPASS --run 'nbdcopy data.img $nbd'
nbdkit: backend.c:718: backend_zero: Assertion `c->can_zero > NBDKIT_ZERO_NONE' failed.
write at offset 0 failed: Transport endpoint is not connected
nbdkit: nbdkit command was killed by signal 6



-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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