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
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