nbd/server: Don't fail NBD_OPT_INFO for byte-aligned sources
In commit 0c1d50bd, I added a couple of TODO comments about whether we consult bl.request_alignment when responding to NBD_OPT_INFO. At the time, qemu as server was hard-coding an advertised alignment of 512 to clients that promised to obey constraints, and there was no function for getting at a device's preferred alignment. But in hindsight, advertising 512 when the block device prefers 1 caused other compliance problems, and commit b0245d64 changed one of the two TODO comments to advertise a more accurate alignment. Time to fix the other TODO. Doesn't really impact qemu as client (our normal client doesn't use NBD_OPT_INFO, and qemu-nbd --list promises to obey block sizes), but it might prove useful to other clients. Fixes: b0245d64Signed-off-by: NEric Blake <eblake@redhat.com> Message-Id: <20190403030526.12258-4-eblake@redhat.com> Reviewed-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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