[PATCH 08/23] nfs: stash nfs_subversion reference into nfs_mount_info

[David Howells <dhowells@xxxxxxxxxx>]

From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>

That will allow to get rid of passing those references around in
quite a few places.  Moreover, that will allow to merge xdev and
remote file_system_type.

Reviewed-by: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---

 fs/nfs/internal.h  |    1 +
 fs/nfs/namespace.c |    6 +++---
 fs/nfs/nfs4super.c |    1 +
 fs/nfs/super.c     |    1 +
 4 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 496a0e03f2b2..62af450bb91a 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -149,6 +149,7 @@ struct nfs_mount_info {
 	struct nfs_clone_mount *cloned;
 	struct nfs_server *server;
 	struct nfs_fh *mntfh;
+	struct nfs_subversion *nfs_mod;
 };
 
 extern int nfs_mount(struct nfs_mount_request *info);
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 9622575682da..476f4c0d5542 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -232,8 +232,8 @@ struct vfsmount *nfs_do_submount(struct dentry *dentry, struct nfs_fh *fh,
 		.set_security = nfs_clone_sb_security,
 		.cloned = &mountdata,
 		.mntfh = fh,
+		.nfs_mod = NFS_SB(sb)->nfs_client->cl_nfs_mod,
 	};
-	struct nfs_subversion *nfs_mod = NFS_SB(sb)->nfs_client->cl_nfs_mod;
 	struct nfs_server *server;
 	struct vfsmount *mnt;
 	char *page = (char *) __get_free_page(GFP_USER);
@@ -242,8 +242,8 @@ struct vfsmount *nfs_do_submount(struct dentry *dentry, struct nfs_fh *fh,
 	if (page == NULL)
 		return ERR_PTR(-ENOMEM);
 
-	server = nfs_mod->rpc_ops->clone_server(NFS_SB(sb), fh,
-						fattr, authflavor);
+	server = mount_info.nfs_mod->rpc_ops->clone_server(NFS_SB(sb), fh,
+							   fattr, authflavor);
 	if (IS_ERR(server))
 		return ERR_CAST(server);
 
diff --git a/fs/nfs/nfs4super.c b/fs/nfs/nfs4super.c
index 1710df8240fb..25253c235fba 100644
--- a/fs/nfs/nfs4super.c
+++ b/fs/nfs/nfs4super.c
@@ -247,6 +247,7 @@ static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
 		.fill_super = nfs_fill_super,
 		.set_security = nfs_clone_sb_security,
 		.cloned = data,
+		.nfs_mod = &nfs_v4,
 	};
 	struct dentry *res;
 
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index f0a8f1da394b..c76b4fe73fab 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2713,6 +2713,7 @@ struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
 		mntroot = ERR_CAST(nfs_mod);
 		goto out;
 	}
+	mount_info.nfs_mod = nfs_mod;
 
 	mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);