[PATCH v11 05/20] nfsd: add Kconfig options to allow localio to be enabled

[Mike Snitzer <snitzer@kernel.org>]

CONFIG_NFSD_LOCALIO controls the server enablement for localio.
A later commit will add CONFIG_NFS_LOCALIO to allow the client
enablement.

While it is true that it doesn't make sense, on a using LOCALIO level,
to have one without the other: it is useful to allow a mix be
configured for testing purposes.  It could be that the same control
could be achieved by exposing a discrete "localio_enabled"
module_param in the server (nfsd.ko) like is already available in the
client (nfs.ko).

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
---
 fs/Kconfig      |  3 +++
 fs/nfsd/Kconfig | 14 ++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/fs/Kconfig b/fs/Kconfig
index a46b0cbc4d8f..170083ff2a51 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -377,6 +377,9 @@ config NFS_ACL_SUPPORT
 	tristate
 	select FS_POSIX_ACL
 
+config NFS_COMMON_LOCALIO_SUPPORT
+	tristate
+
 config NFS_COMMON
 	bool
 	depends on NFSD || NFS_FS || LOCKD
diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
index ec2ab6429e00..a36ff66c7430 100644
--- a/fs/nfsd/Kconfig
+++ b/fs/nfsd/Kconfig
@@ -89,6 +89,20 @@ config NFSD_V4
 
 	  If unsure, say N.
 
+config NFSD_LOCALIO
+	tristate "NFS server support for the LOCALIO auxiliary protocol"
+	depends on NFSD || NFSD_V4
+	select NFS_COMMON_LOCALIO_SUPPORT
+	help
+	  Some NFS servers support an auxiliary NFS LOCALIO protocol
+	  that is not an official part of the NFS version 3 or 4 protocol.
+
+	  This option enables support for the LOCALIO protocol in the
+	  kernel's NFS server.  Enable this to bypass using the NFS
+	  protocol when issuing reads, writes and commits to the server.
+
+	  If unsure, say N.
+
 config NFSD_PNFS
 	bool
 
-- 
2.44.0