nfs_pub: move from vfs_subr.c to vfs_export.c

nfs_pub is used only in vfs_export.c.

Reviewed by:	kib, rmacklem
Differential Revision:	https://reviews.freebsd.org/D56777

sys/kern/vfs_export.c

@@ -62,6 +62,9 @@
 #include <rpc/types.h>
 #include <rpc/auth.h>
 
+/* Publicly exported FS */
+static struct nfs_public nfs_pub;
+
 static MALLOC_DEFINE(M_NETADDR, "export_host", "Export host address structure");
 
 #if defined(INET) || defined(INET6)

sys/kern/vfs_subr.c

@@ -237,9 +237,6 @@ static struct mtx mntid_mtx;
  */
 static struct mtx __exclusive_cache_line vnode_list_mtx;
 
-/* Publicly exported FS */
-struct nfs_public nfs_pub;
-
 static uma_zone_t buf_trie_zone;
 static smr_t buf_trie_smr;
 

sys/sys/mount.h

@@ -1071,7 +1071,6 @@ int	vfs_report_lockf(struct mount *mp, struct sbuf *sb);
 
 extern	TAILQ_HEAD(mntlist, mount) mountlist;	/* mounted filesystem list */
 extern	struct mtx_padalign mountlist_mtx;
-extern	struct nfs_public nfs_pub;
 extern	struct sx vfsconf_sx;
 #define	vfsconf_lock()		sx_xlock(&vfsconf_sx)
 #define	vfsconf_unlock()	sx_xunlock(&vfsconf_sx)