vfs: Kill mount_ns()

Kill mount_ns() as it has been replaced by vfs_get_super() in the new mount
API.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/super.c

@@ -1143,44 +1143,6 @@ void kill_litter_super(struct super_block *sb)
 }
 EXPORT_SYMBOL(kill_litter_super);
 
-static int ns_test_super(struct super_block *sb, void *data)
-{
-	return sb->s_fs_info == data;
-}
-
-static int ns_set_super(struct super_block *sb, void *data)
-{
-	sb->s_fs_info = data;
-	return set_anon_super(sb, NULL);
-}
-
-struct dentry *mount_ns(struct file_system_type *fs_type,
-	int flags, void *data, void *ns, struct user_namespace *user_ns,
-	int (*fill_super)(struct super_block *, void *, int))
-{
-	struct super_block *sb;
-
-	sb = sget_userns(fs_type, ns_test_super, ns_set_super, flags,
-			 user_ns, ns);
-	if (IS_ERR(sb))
-		return ERR_CAST(sb);
-
-	if (!sb->s_root) {
-		int err;
-		err = fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
-		if (err) {
-			deactivate_locked_super(sb);
-			return ERR_PTR(err);
-		}
-
-		sb->s_flags |= SB_ACTIVE;
-	}
-
-	return dget(sb->s_root);
-}
-
-EXPORT_SYMBOL(mount_ns);
-
 int set_anon_super_fc(struct super_block *sb, struct fs_context *fc)
 {
 	return set_anon_super(sb, NULL);

include/linux/fs.h

@@ -2206,9 +2206,6 @@ struct file_system_type {
 
 #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)
 
-extern struct dentry *mount_ns(struct file_system_type *fs_type,
-	int flags, void *data, void *ns, struct user_namespace *user_ns,
-	int (*fill_super)(struct super_block *, void *, int));
 #ifdef CONFIG_BLOCK
 extern struct dentry *mount_bdev(struct file_system_type *fs_type,
 	int flags, const char *dev_name, void *data,