mnt: Export __open_mountpoint

We gonna need it for inotify handle testing.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/mount.h

@@ -95,6 +95,7 @@ extern int mntns_get_root_by_mnt_id(int mnt_id);
 extern struct ns_id *lookup_nsid_by_mnt_id(int mnt_id);
 
 extern int open_mount(unsigned int s_dev);
+extern int __open_mountpoint(struct mount_info *pm, int mnt_fd);
 extern struct fstype *find_fstype_by_name(char *fst);
 extern bool add_fsname_auto(const char *names);
 

mount.c

@@ -1004,7 +1004,7 @@ static struct mount_info *mnt_build_tree(struct mount_info *list, bool insert_ro
  * mnt_fd is a file descriptor on the mountpoint, which is closed in an error case.
  * If mnt_fd is -1, the mountpoint will be opened by this function.
  */
-static int __open_mountpoint(struct mount_info *pm, int mnt_fd)
+int __open_mountpoint(struct mount_info *pm, int mnt_fd)
 {
 	dev_t dev;
 	struct stat st;