Deleting files

File hierarchy objects are deleted with the vn_remove, vn_rmdir, and vn_rename calls. The vn_rename function causes the deletion of the new_name file when it exists.

The interface for all these operations includes the object's:

Parent directory vnode, as a token structure
Name, as a character string
PFS file token

Serialization: An exclusive latch is obtained for the parent directory vnode and the object's vnode. For vn_rename, an exclusive latch is held on both parent directories, the old object vnode, and the new object vnode, if it exists.