linux-kernel - Re: [PATCH v3 1/1] dcache: Translating dentry into pathname without taking rename

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Date:	Sat, 7 Sep 2013 19:53:51 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Waiman Long <Waiman.Long@...com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>,
	George Spelvin <linux@...izon.com>,
	John Stoffel <john@...ffel.org>
Subject: Re: [PATCH v3 1/1] dcache: Translating dentry into pathname without
 taking rename_lock

On Sat, Sep 07, 2013 at 07:07:24PM +0100, Al Viro wrote:

> with these loops turning into
> 	seq = read_seqlock(&rename_lock);
again:
> 	...
> 	if (!seqretry_and_lock(&rename_lock, &seq))
> 		goto again;
> 	...
> 	seqretry_done(&rename_lock);

Forgot the label, sorry.

And I agree that d_lookup() ought to stay as is - this is just about
the ones that try readlock once and then fall back to writer.
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