[PATCHv2 0/2] nbd: add discard support

[paul . clements]

This patchset adds discard request support to nbd. This should be good
for inclusion in next.

The first patch adds a set-flags ioctl, allowing various option flags
to be set on an nbd device. One of the new flags (NBD_FLAG_SEND_TRIM)
tells the nbd client to send discard requests to the server.

The second patch adds handling of discard requests to nbd when
NBD_FLAG_SEND_TRIM is set.

Thanks,
Paul
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