tree 524aa4ff19872df73605600015ab6a597da2864b
parent 418638d3e448e0ed79d55cc43a26f7a65c22007f
author Eric Blake <eblake@redhat.com> 1510024152 -0600
committer Eric Blake <eblake@redhat.com> 1515424343 -0600

nbd/server: Optimize final chunk of sparse read

If we are careful to handle 0-length read requests correctly,
we can optimize our sparse read to send the NBD_REPLY_FLAG_DONE
bit on our last OFFSET_DATA or OFFSET_HOLE chunk rather than
needing a separate chunk.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20171107030912.23930-3-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>