From: Al Viro <viro@ZenIV.linux.org.uk>
To: Waiman Long <waiman.long@hp.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
"Chandramouleeswaran, Aswin" <aswin@hp.com>,
"Norton, Scott J" <scott.norton@hp.com>,
George Spelvin <linux@horizon.com>,
John Stoffel <john@stoffel.org>
Subject: Re: [PATCH v4 1/1] dcache: Translating dentry into pathname without taking rename_lock
Date: Mon, 9 Sep 2013 19:07:21 +0100 [thread overview]
Message-ID: <20130909180720.GP13318@ZenIV.linux.org.uk> (raw)
In-Reply-To: <522E0B7A.2080401@hp.com>
On Mon, Sep 09, 2013 at 01:55:06PM -0400, Waiman Long wrote:
> >I'm not sure I like mixing rcu_read_lock() into that - d_path() and friends
> >can do that themselves just fine (it needs to be taken when seq is even),
> >and e.g. d_walk() doesn't need it at all. Other than that, I'm OK with
> >this variant.
>
> I think rcu_read_lock() is needed to make sure that the dentry won't
> be freed as we don't take d_lock now.
Sure, you do need that; the question is whether you need to take it in
the primitives you are introducing.
prev parent reply other threads:[~2013-09-09 18:07 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-09 16:18 [PATCH v4 0/1] dcache: Translating dentry into pathname without taking rename_lock Waiman Long
2013-09-09 16:18 ` [PATCH v4 1/1] " Waiman Long
2013-09-09 17:29 ` Al Viro
2013-09-09 17:45 ` Linus Torvalds
2013-09-09 17:56 ` Waiman Long
2013-09-09 18:06 ` Al Viro
2013-09-09 18:15 ` Linus Torvalds
2013-09-09 18:21 ` Al Viro
2013-09-09 18:36 ` Al Viro
2013-09-09 18:46 ` Al Viro
2013-09-09 18:46 ` Waiman Long
2013-09-09 19:10 ` Al Viro
2013-09-09 19:28 ` Al Viro
2013-09-09 22:57 ` Waiman Long
2013-09-10 0:40 ` George Spelvin
2013-09-10 0:57 ` Al Viro
2013-09-10 1:15 ` Ramkumar Ramachandra
2013-09-10 1:34 ` Linus Torvalds
2013-09-10 2:25 ` Al Viro
2013-09-10 2:33 ` Linus Torvalds
2013-09-10 3:12 ` Ramkumar Ramachandra
2013-09-10 8:24 ` George Spelvin
2013-09-10 3:57 ` Waiman Long
2013-09-09 17:55 ` Waiman Long
2013-09-09 18:07 ` Al Viro [this message]
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