tree ea3bcde8cc26c19c44332dbbe4fa0cd1d048b13e
parent 03ff8821eb5ed168792667cfc3ddff903e97af99
author Chuck Lever <chuck.lever@oracle.com> 1401287554 -0400
committer Anna Schumaker <Anna.Schumaker@Netapp.com> 1401886597 -0400

xprtrdma: Remove MEMWINDOWS registration modes

The MEMWINDOWS and MEMWINDOWS_ASYNC memory registration modes were
intended as stop-gap modes before the introduction of FRMR. They
are now considered obsolete.

MEMWINDOWS_ASYNC is also considered unsafe because it can leave
client memory registered and exposed for an indeterminant time after
each I/O.

At this point, the MEMWINDOWS modes add needless complexity, so
remove them.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>