On Fri, 16 May 2008 00:11:21 +1000, Christoph Hellwig <hch@xxxxxxxxxxxxx>
wrote:
On Thu, May 15, 2008 at 02:43:44PM +0100, Anton Altaparmakov wrote:
Yes, and you can get the performance back if you allow negative
dentries to
be created. You just have to make sure that every time a directory
entry
is created in directory X, all negative dentries which are children of
directory X are thrown away.
We might even be able to optimize this a little by calling d_compare on
each alias to see if it hashes down to the same one down in the fs.
So, I gather from this comment is that the CI FS implementation overrides
d_compare but not d_hash, and the CI purge function will behave differently
if d_compare is overridden or not? If overridden, use it as per your
suggestion and if not (due to oversight or unexpected problems), purge
all negative children?
Barry.
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