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nbd: Expose constants and structs for structured read

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Upcoming patches will implement the NBD structured reply
extension [1] for both client and server roles.  Declare the
constants, structs, and lookup routines that will be valuable
whether the server or client code is backported in isolation.

This includes moving one constant from an internal header to
the public header, as part of the structured read processing
will be done in block/nbd-client.c rather than nbd/client.c.

[1]https://github.com/NetworkBlockDevice/nbd/blob/extension-structured-reply/doc/proto.md

Based on patches from Vladimir Sementsov-Ogievskiy.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20171027104037.8319-4-eblake@redhat.com>
This commit is contained in:
Eric Blake 2017-10-27 12:40:28 +02:00
parent dd68944049
commit bae245d19a
4 changed files with 71 additions and 1 deletions
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2
nbd/server.c
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@ -40,6 +40,8 @@ static int system_errno_to_nbd_errno(int err)
case EFBIG:
case ENOSPC:
return NBD_ENOSPC;
case EOVERFLOW:
return NBD_EOVERFLOW;
case ESHUTDOWN:
return NBD_ESHUTDOWN;
case EINVAL: