[PATCH] NFSv4_2: SSC helper should use its own config.

[Dai Ngo <dai.ngo@oracle.com>]

Currently NFSv4_2 SSC helper, nfs_ssc, incorrectly uses GRACE_PERIOD
as its config. Fix by adding new config NFS_V4_2_SSC_HELPER which
depends on NFS_V4_2 and is automatically selected when NFSD_V4 is
enabled. Also removed the file name from a comment in nfs_ssc.c.

Fixes: 0cfcd405e758 (NFSv4.2: Fix NFS4ERR_STALE error when doing inter server copy)
Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
---
 fs/Kconfig              |  3 +++
 fs/nfs/nfs4file.c       |  4 ++++
 fs/nfs/super.c          | 12 ++++++++++++
 fs/nfs_common/Makefile  |  2 +-
 fs/nfs_common/nfs_ssc.c |  2 --
 fs/nfsd/Kconfig         |  1 +
 6 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/fs/Kconfig b/fs/Kconfig
index aa4c12282301..d33a31239cbc 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -333,6 +333,9 @@ config NFS_COMMON
 	depends on NFSD || NFS_FS || LOCKD
 	default y
 
+config NFS_V4_2_SSC_HELPER
+	tristate
+
 source "net/sunrpc/Kconfig"
 source "fs/ceph/Kconfig"
 source "fs/cifs/Kconfig"
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 57b3821d975a..441a2fa073c8 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -420,7 +420,9 @@ static const struct nfs4_ssc_client_ops nfs4_ssc_clnt_ops_tbl = {
  */
 void nfs42_ssc_register_ops(void)
 {
+#ifdef CONFIG_NFSD_V4
 	nfs42_ssc_register(&nfs4_ssc_clnt_ops_tbl);
+#endif
 }
 
 /**
@@ -431,7 +433,9 @@ void nfs42_ssc_register_ops(void)
  */
 void nfs42_ssc_unregister_ops(void)
 {
+#ifdef CONFIG_NFSD_V4
 	nfs42_ssc_unregister(&nfs4_ssc_clnt_ops_tbl);
+#endif
 }
 #endif /* CONFIG_NFS_V4_2 */
 
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 4034102010f0..c7a924580eec 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -86,9 +86,11 @@ const struct super_operations nfs_sops = {
 };
 EXPORT_SYMBOL_GPL(nfs_sops);
 
+#ifdef CONFIG_NFS_V4_2
 static const struct nfs_ssc_client_ops nfs_ssc_clnt_ops_tbl = {
 	.sco_sb_deactive = nfs_sb_deactive,
 };
+#endif
 
 #if IS_ENABLED(CONFIG_NFS_V4)
 static int __init register_nfs4_fs(void)
@@ -111,15 +113,21 @@ static void unregister_nfs4_fs(void)
 }
 #endif
 
+#ifdef CONFIG_NFS_V4_2
 static void nfs_ssc_register_ops(void)
 {
+#ifdef CONFIG_NFSD_V4
 	nfs_ssc_register(&nfs_ssc_clnt_ops_tbl);
+#endif
 }
 
 static void nfs_ssc_unregister_ops(void)
 {
+#ifdef CONFIG_NFSD_V4
 	nfs_ssc_unregister(&nfs_ssc_clnt_ops_tbl);
+#endif
 }
+#endif /* CONFIG_NFS_V4_2 */
 
 static struct shrinker acl_shrinker = {
 	.count_objects	= nfs_access_cache_count,
@@ -148,7 +156,9 @@ int __init register_nfs_fs(void)
 	ret = register_shrinker(&acl_shrinker);
 	if (ret < 0)
 		goto error_3;
+#ifdef CONFIG_NFS_V4_2
 	nfs_ssc_register_ops();
+#endif
 	return 0;
 error_3:
 	nfs_unregister_sysctl();
@@ -168,7 +178,9 @@ void __exit unregister_nfs_fs(void)
 	unregister_shrinker(&acl_shrinker);
 	nfs_unregister_sysctl();
 	unregister_nfs4_fs();
+#ifdef CONFIG_NFS_V4_2
 	nfs_ssc_unregister_ops();
+#endif
 	unregister_filesystem(&nfs_fs_type);
 }
 
diff --git a/fs/nfs_common/Makefile b/fs/nfs_common/Makefile
index fa82f5aaa6d9..119c75ab9fd0 100644
--- a/fs/nfs_common/Makefile
+++ b/fs/nfs_common/Makefile
@@ -7,4 +7,4 @@ obj-$(CONFIG_NFS_ACL_SUPPORT) += nfs_acl.o
 nfs_acl-objs := nfsacl.o
 
 obj-$(CONFIG_GRACE_PERIOD) += grace.o
-obj-$(CONFIG_GRACE_PERIOD) += nfs_ssc.o
+obj-$(CONFIG_NFS_V4_2_SSC_HELPER) += nfs_ssc.o
diff --git a/fs/nfs_common/nfs_ssc.c b/fs/nfs_common/nfs_ssc.c
index f43bbb373913..7c1509e968c8 100644
--- a/fs/nfs_common/nfs_ssc.c
+++ b/fs/nfs_common/nfs_ssc.c
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * fs/nfs_common/nfs_ssc_comm.c
- *
  * Helper for knfsd's SSC to access ops in NFS client modules
  *
  * Author: Dai Ngo <dai.ngo@oracle.com>
diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
index dbbc583d6273..821e5913faee 100644
--- a/fs/nfsd/Kconfig
+++ b/fs/nfsd/Kconfig
@@ -76,6 +76,7 @@ config NFSD_V4
 	select CRYPTO_MD5
 	select CRYPTO_SHA256
 	select GRACE_PERIOD
+	select NFS_V4_2_SSC_HELPER if NFS_V4_2
 	help
 	  This option enables support in your system's NFS server for
 	  version 4 of the NFS protocol (RFC 3530).
-- 
2.9.5