Re: dcache problems with vfat

Linus Torvalds (torvalds@transmeta.com)
Mon, 4 Jan 1999 22:04:19 -0800 (PST)

On Tue, 5 Jan 1999 Andries.Brouwer@cwi.nl wrote:
>
> What happens? The "cd /mnt/dir/file" needs the dcache
> entry of dir, but the revalidate fails because dir was
> timestamped with the version of /mnt, but that changed
> when mv ../file . was done. So, the old entry for dir
> is dropped and a new lookup is done.

Hmm.. The old dentry for dir should not just be dropped, it should be
released. Now why doesn't that happen? That sounds like the source of the
problem (technically just dropping the dentry is correct from a dentry
coherency point of view, but leaving an unreferenced and unhashed dentry
around is just a waste of resources and leads to these kinds of secondary
issues).

Linus

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