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

From: Ramkumar Ramachandra
Date: Mon Sep 09 2013 - 23:13:43 EST


Linus Torvalds wrote:
> 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.

Right; it's sequential.

> 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.

No, it's write-locking.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/