[RFC 08/26] VFS: Export lives_below_in_same_fs()

[Jan Blunck <jblunck@suse.de>]

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Export lives_below_in_same_fs() for use in union mount code.

Signed-off-by: Jan Blunck <jblunck@suse.de>
---
 fs/namespace.c        |    3 ++-
 include/linux/mount.h |    1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -793,7 +793,7 @@ static bool permit_mount(struct nameidat
 	return true;
 }
 
-static int lives_below_in_same_fs(struct dentry *d, struct dentry *dentry)
+int lives_below_in_same_fs(struct dentry *d, struct dentry *dentry)
 {
 	while (1) {
 		if (d == dentry)
@@ -803,6 +803,7 @@ static int lives_below_in_same_fs(struct
 		d = d->d_parent;
 	}
 }
+EXPORT_SYMBOL_GPL(lives_below_in_same_fs);
 
 struct vfsmount *copy_tree(struct vfsmount *mnt, struct dentry *dentry,
 					int flag, uid_t owner)
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -106,6 +106,7 @@ extern void shrink_submounts(struct vfsm
 
 extern spinlock_t vfsmount_lock;
 extern dev_t name_to_dev_t(char *name);
+extern int lives_below_in_same_fs(struct dentry *, struct dentry *);
 
 #endif
 #endif /* _LINUX_MOUNT_H */

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