On Sat, Jan 14, 2017 at 6:31 PM, Christoph Anton Mitterer
<calestyo@xxxxxxxxxxxx> wrote:
Hi.
On advice from Alex Bligh I'd like to ping linux-block and nbd-general
about the issue described here:
https://github.com/NetworkBlockDevice/nbd/issues/44
What basically happens is, that with a recent kernel (Linux heisenberg
4.9.0-1-amd64 #1 SMP Debian 4.9.2-2 (2017-01-12) x86_64 GNU/Linux),
when a device larger than something between 1 TiB and 2 TiB is
exported
via nbd-server and connected to via nbd-client (which uses the kernel
driver, AFAIU) than the device size gets insanely large while reading
from /dev/nbd0 gives actually nothing.
The bug does not seem to happen when the kernel is not involved (we
tried using nbd-server and qemu-img as the client).
Don't think it makes all too much sense to copy & paste everything
from
what was tried already for testing here, so please have a look at the
issue on github.
Yeah I noticed this in testing, there's a bug with NBD since it's
inception where it uses a 32 bit number for keeping track of the size
of the device, I fixed it with
nbd: use loff_t for blocksize and nbd_set_size args
It'll be in 4.10. Thanks,
Josef
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