Why don't register a d_delete function for externfs_dentry_ops in 2.4 kernel?

Why don't register a d_delete function for externfs_dentry_ops in 2.4 kernel?

[lepton]

Hi!
	I read about code of linux-2.4.31/arch/um/fs/hostfs/externfs.c

	I found you have defined a function named exterfs_d_delete, but
	you don't register this function in externfs_dentry_ops.

	This behavior is diffrent from the hostfs code in 2.6 kernel

	It will lead to some strange problem like this:

	on guest UML box:  ls -l /tmp/nonexist  ( the result is "file not
	found", it is correct)

	IN the directory of host os: touch ..../tmp/nonexist

	on guest UML box again: ls -l /tmp/nonexist ( the result keeps "file
	not found",  a incorrect negative dcache hit)

	I don't kown why 2.4 kernel have not fixed it.

	What do you think about it?

	Thanks