[for-6.11 PATCH 24/29] nfs_common: add NFS v4 LOCALIO protocol extension enablement

[Mike Snitzer <snitzer@kernel.org>]

Add CONFIG_NFS_V4_LOCALIO and CONFIG_NFSD_V4_LOCALIO to Kconfig.
Extend nfs_common's nfsd_uuids list infrastructure to NFS v4.

Also, nfs and nfsd will only build their respective localio.c if
either NFS_V{3,4}_LOCALIO and/or either NFSD_V{3,4}_LOCALIO are
enabled.

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
---
 fs/nfs/Kconfig   | 14 +++++++++++++-
 fs/nfs/Makefile  |  1 +
 fs/nfsd/Kconfig  | 14 +++++++++++++-
 fs/nfsd/Makefile |  1 +
 fs/nfsd/netns.h  |  2 +-
 fs/nfsd/nfssvc.c |  6 +++---
 6 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index db8c9d6edcea..453ec4903086 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -5,7 +5,7 @@ config NFS_FS
 	select LOCKD
 	select SUNRPC
 	select NFS_ACL_SUPPORT if NFS_V3_ACL
-	select NFS_LOCALIO_SUPPORT if NFS_V3_LOCALIO
+	select NFS_LOCALIO_SUPPORT if NFS_V3_LOCALIO || NFS_V4_LOCALIO
 	help
 	  Choose Y here if you want to access files residing on other
 	  computers using Sun's Network File System protocol.  To compile
@@ -99,6 +99,18 @@ config NFS_V4
 
 	  If unsure, say Y.
 
+config NFS_V4_LOCALIO
+	bool "NFS client support for the NFSv4 LOCALIO protocol extension"
+	depends on NFS_V4
+	help
+	  Some NFS servers support an auxiliary NFSv4 LOCALIO protocol
+	  that is not an official part of the NFS version 4 protocol.
+
+	  This option enables support for version 4 of the LOCALIO
+	  protocol in the kernel's NFS client.
+
+	  If unsure, say N.
+
 config NFS_SWAP
 	bool "Provide swap over NFS support"
 	default n
diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
index 7fed1ce375da..ad9923fb0f03 100644
--- a/fs/nfs/Makefile
+++ b/fs/nfs/Makefile
@@ -14,6 +14,7 @@ nfs-$(CONFIG_ROOT_NFS)	+= nfsroot.o
 nfs-$(CONFIG_SYSCTL)	+= sysctl.o
 nfs-$(CONFIG_NFS_FSCACHE) += fscache.o
 nfs-$(CONFIG_NFS_V3_LOCALIO) += localio.o
+nfs-$(CONFIG_NFS_V4_LOCALIO) += localio.o
 
 obj-$(CONFIG_NFS_V2) += nfsv2.o
 nfsv2-y := nfs2super.o proc.o nfs2xdr.o
diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
index c8eb7e2d4006..34d540324dfa 100644
--- a/fs/nfsd/Kconfig
+++ b/fs/nfsd/Kconfig
@@ -9,7 +9,7 @@ config NFSD
 	select EXPORTFS
 	select NFS_ACL_SUPPORT if NFSD_V2_ACL
 	select NFS_ACL_SUPPORT if NFSD_V3_ACL
-	select NFS_LOCALIO_SUPPORT if NFSD_V3_LOCALIO
+	select NFS_LOCALIO_SUPPORT if NFSD_V3_LOCALIO || NFSD_V4_LOCALIO
 	depends on MULTIUSER
 	help
 	  Choose Y here if you want to allow other computers to access
@@ -102,6 +102,18 @@ config NFSD_V4
 
 	  If unsure, say N.
 
+config NFSD_V4_LOCALIO
+	bool "NFS server support for the NFSv4 LOCALIO protocol extension"
+	depends on NFSD_V4
+	help
+	  Some NFS servers support an auxiliary NFSv4 LOCALIO protocol
+	  that is not an official part of the NFS version 4 protocol.
+
+	  This option enables support for version 4 of the LOCALIO
+	  protocol in the kernel's NFS server.
+
+	  If unsure, say N.
+
 config NFSD_PNFS
 	bool
 
diff --git a/fs/nfsd/Makefile b/fs/nfsd/Makefile
index 0e01749f6153..51d52fb0cd04 100644
--- a/fs/nfsd/Makefile
+++ b/fs/nfsd/Makefile
@@ -24,3 +24,4 @@ nfsd-$(CONFIG_NFSD_BLOCKLAYOUT) += blocklayout.o blocklayoutxdr.o
 nfsd-$(CONFIG_NFSD_SCSILAYOUT) += blocklayout.o blocklayoutxdr.o
 nfsd-$(CONFIG_NFSD_FLEXFILELAYOUT) += flexfilelayout.o flexfilelayoutxdr.o
 nfsd-$(CONFIG_NFSD_V3_LOCALIO) += localio.o
+nfsd-$(CONFIG_NFSD_V4_LOCALIO) += localio.o
diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index 5c5f7030ad87..afeabe5c7613 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -214,7 +214,7 @@ struct nfsd_net {
 	/* last time an admin-revoke happened for NFSv4.0 */
 	time64_t		nfs40_last_revoke;
 
-#if defined(CONFIG_NFSD_V3_LOCALIO)
+#if defined(CONFIG_NFSD_V3_LOCALIO) || defined(CONFIG_NFSD_V4_LOCALIO)
 	nfsd_uuid_t		nfsd_uuid;
 #endif
 };
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index c18ee0f56da4..fab699699869 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -466,7 +466,7 @@ static int nfsd_startup_net(struct net *net, const struct cred *cred)
 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
 	nfsd4_ssc_init_umount_work(nn);
 #endif
-#if defined(CONFIG_NFSD_V3_LOCALIO)
+#if defined(CONFIG_NFSD_V3_LOCALIO) || defined(CONFIG_NFSD_V4_LOCALIO)
 	INIT_LIST_HEAD(&nn->nfsd_uuid.list);
 	list_add_tail_rcu(&nn->nfsd_uuid.list, &nfsd_uuids);
 #endif
@@ -499,7 +499,7 @@ static void nfsd_shutdown_net(struct net *net)
 		nn->lockd_up = false;
 	}
 	nn->nfsd_net_up = false;
-#if defined(CONFIG_NFSD_V3_LOCALIO)
+#if defined(CONFIG_NFSD_V3_LOCALIO) || defined(CONFIG_NFSD_V4_LOCALIO)
 	list_del_rcu(&nn->nfsd_uuid.list);
 #endif
 	nfsd_shutdown_generic();
@@ -832,7 +832,7 @@ nfsd_svc(int nrservs, struct net *net, const struct cred *cred, const char *scop
 
 	strscpy(nn->nfsd_name, scope ? scope : utsname()->nodename,
 		sizeof(nn->nfsd_name));
-#if defined(CONFIG_NFSD_V3_LOCALIO)
+#if defined(CONFIG_NFSD_V3_LOCALIO) || defined(CONFIG_NFSD_V4_LOCALIO)
 	uuid_gen(&nn->nfsd_uuid.uuid);
 #endif
 
-- 
2.44.0