vfs: propagate snapshot enumeration errors
The current FSCTL_GET_SHADOW_COPY_DATA/FSCTL_SRV_ENUMERATE_SNAPSHOTS
handler squashes all non-ENOSYS errors into an NT_STATUS_UNSUCCESSFUL
response.
This commit ensures that all errors are propagated up to the client, to
aid debugging.
The Windows Explorer "Previous Versions" dialogue doesn't appear to
distinguish between error codes. It displays "There are no previous
versions available".
Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Thu Feb 27 22:42:50 CET 2014 on sn-devel-104