Commit 122eace8 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] __d_path needs vfsmount_lock

From: Mike Waychison <Michael.Waychison@Sun.COM>

- protect vfsmount->mnt_parent by taking vfsmount_lock in __d_path
parent 702e97e7
......@@ -1296,10 +1296,14 @@ static char * __d_path( struct dentry *dentry, struct vfsmount *vfsmnt,
break;
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
/* Global root? */
if (vfsmnt->mnt_parent == vfsmnt)
spin_lock(&vfsmount_lock);
if (vfsmnt->mnt_parent == vfsmnt) {
spin_unlock(&vfsmount_lock);
goto global_root;
}
dentry = vfsmnt->mnt_mountpoint;
vfsmnt = vfsmnt->mnt_parent;
spin_unlock(&vfsmount_lock);
continue;
}
parent = dentry->d_parent;
......
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