Re: [PATCH v4 1/1] dcache: Translating dentry into pathname withouttaking rename_lock

[Linus Torvalds]

On Mon, Sep 9, 2013 at 6:15 PM, Ramkumar Ramachandra <artagnon@xxxxxxxxx> wrote:
>
> Maybe it should then?

It doesn't need to. The RCU lookup looks at individual dentry sequence
numbers and doesn't care about the bigger rename sequence number at
all.

The fallback (if you hit one of the very very rare races, or if you
hit a symlink) ends up doing per-path-component lookups under the
rename sequence lock, but for it, read-locking it until it succeeds is
the right thing to do.

              Linus
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