linux-kernel - Re: [PATCH 3.18 15/19] move d_rcu from overlapping d_child to overlapping d

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Date:	Mon, 15 Dec 2014 21:34:28 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Josh Boyer <jwboyer@...oraproject.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 3.18 15/19] move d_rcu from overlapping d_child to
 overlapping d_alias

On Mon, Dec 15, 2014 at 04:21:12PM -0500, Josh Boyer wrote:
> On Mon, Dec 15, 2014 at 11:38 AM, Josh Boyer <jwboyer@...oraproject.org> wrote:
> > On Mon, Dec 15, 2014 at 11:34 AM, Greg Kroah-Hartman
> > <gregkh@...uxfoundation.org> wrote:
> >> On Mon, Dec 15, 2014 at 10:46:50AM -0500, Josh Boyer wrote:
> >>> On Sun, Dec 14, 2014 at 12:21:26PM -0800, Greg Kroah-Hartman wrote:
> >>> >3.18-stable review patch.  If anyone has any objections, please let me know.
> >>> >
> >>> >------------------
> >>> >
> >>> >From: Al Viro <viro@...iv.linux.org.uk>
> >>> >
> >>> >commit 946e51f2bf37f1656916eb75bd0742ba33983c28 upstream.
> >>> >
> >>> >Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> >>> >Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> >>>
> >>> I noticed you don't have this (and the child commit) queued for 3.17.y.
> >>
> >> That is because:
> >>
> >>> The backport wasn't exactly straight-forward because of the d_external
> >>> stuff, but I took a swing at it.  After that, the other commit was a
> >>> quick cherry-pick.
> >>
> >> It wasn't a "simple" backport, and I didn't have the time.  I'm also
> >> going to drop 3.17 real-soon-now.
> >
> > Right, figured.  Fedora isn't going to rebase the stable releases to
> > 3.18 until 3.18.2-ish, and this fixes an issue so I thought I'd give
> > it a try.
> >
> >>> Al, does the below look correct for a backport on top of 3.17.6?  It
> >>> builds, but I haven't tested it yet.
> >>
> >> Testing would be great to do :)
> >
> > Working on it.  Just wanted to send it out early in case Al spotted
> > something obviously wrong and wanted to yell at me for it.
> 
> Finally got around to booting it.  Something is definitely wrong.  Sigh.

Start with moving WARN_ON() into dentry_free() (as it's done in mainline and
for the same reason)...
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