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authorDavid Howells <dhowells@redhat.com>2012-06-25 12:55:28 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2012-07-14 16:38:32 +0400
commitf015f1267b23d3530d3f874243fb83cb5f443005 (patch)
tree14db3794b2716614ee8acfaaad011d6fe7e6db44 /fs/namei.c
parentbe34d1a3bc4b6f357a49acb55ae870c81337e4f0 (diff)
VFS: Comment mount following code
Add comments describing what the directions "up" and "down" mean and ref count handling to the VFS mount following family of functions. Signed-off-by: Valerie Aurora <vaurora@redhat.com> (Original author) Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 0e1b9c3eb36..c6dcb4c8f86 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -672,6 +672,16 @@ static int follow_up_rcu(struct path *path)
return 1;
}
+/*
+ * follow_up - Find the mountpoint of path's vfsmount
+ *
+ * Given a path, find the mountpoint of its source file system.
+ * Replace @path with the path of the mountpoint in the parent mount.
+ * Up is towards /.
+ *
+ * Return 1 if we went up a level and 0 if we were already at the
+ * root.
+ */
int follow_up(struct path *path)
{
struct mount *mnt = real_mount(path->mnt);