commit 643822b41e5e0f133438883b0be574cdaf168a2a
author Al Viro <viro@zeniv.linux.org.uk> Thu Nov 24 22:00:28 2011 -0500
committer Al Viro <viro@zeniv.linux.org.uk> Tue Jan 03 22:57:04 2012 -0500
tree 1b9bbeace5c1078ae6e893e2f826b724411d3a07
parent 676da58df740f325034b8641311413c2393588e1

vfs: spread struct mount - is_path_reachable

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index ced3aa5..b117d94 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2559,21 +2559,21 @@
  *
  * namespace_sem or vfsmount_lock is held
  */
-bool is_path_reachable(struct vfsmount *mnt, struct dentry *dentry,
+bool is_path_reachable(struct mount *mnt, struct dentry *dentry,
 			 const struct path *root)
 {
-	while (mnt != root->mnt && mnt_has_parent(real_mount(mnt))) {
-		dentry = mnt->mnt_mountpoint;
-		mnt = mnt->mnt_parent;
+	while (&mnt->mnt != root->mnt && mnt_has_parent(mnt)) {
+		dentry = mnt->mnt.mnt_mountpoint;
+		mnt = real_mount(mnt->mnt.mnt_parent);
 	}
-	return mnt == root->mnt && is_subdir(dentry, root->dentry);
+	return &mnt->mnt == root->mnt && is_subdir(dentry, root->dentry);
 }
 
 int path_is_under(struct path *path1, struct path *path2)
 {
 	int res;
 	br_read_lock(vfsmount_lock);
-	res = is_path_reachable(path1->mnt, path1->dentry, path2);
+	res = is_path_reachable(real_mount(path1->mnt), path1->dentry, path2);
 	br_read_unlock(vfsmount_lock);
 	return res;
 }
@@ -2659,7 +2659,7 @@
 	if (!mnt_has_parent(new_mnt))
 		goto out4; /* not attached */
 	/* make sure we can reach put_old from new_root */
-	if (!is_path_reachable(old.mnt, old.dentry, &new))
+	if (!is_path_reachable(real_mount(old.mnt), old.dentry, &new))
 		goto out4;
 	br_write_lock(vfsmount_lock);
 	detach_mnt(new_mnt, &parent_path);