Re: [PATCH 27/32] xfs: Add parent pointer ioctls

Darrick J. Wong
2024-04-17T05:22:46Z

On Tue, Apr 16, 2024 at 12:14:24PM -0700, Christoph Hellwig wrote:
> On Tue, Apr 16, 2024 at 12:07:33PM -0700, Darrick J. Wong wrote:
> > Ohhhh, does that happens outside of XFS then? No wonder I couldn't find
> > what you were talking about. Ok I'll go look some more.
>
> Yes. get_name() in fs/exportfs/expfs.c.

Hmm. Implementing a custom ->get_name for pptrs would work well for
child files with low hardlink counts. Certainly there are probably a
lot more large directories than files that are hardlinked many many
times. At what point does it become cheaper to scan the directory?

--D