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Date:	Fri, 24 Oct 2014 03:20:55 +0100
From:	Al Viro <>
To:	Miklos Szeredi <>
Cc:	Linus Torvalds <>,,,
Subject: Re: [GIT PULL] overlay filesystem v25

On Fri, Oct 24, 2014 at 01:25:39AM +0200, Miklos Szeredi wrote:
> Linus,
> Please pull
>   git:// overlayfs.v25
> Plenty of bugs fixed relative to the previous version, thanks to Al Viro's
> review and is now officially be BugFree(TM).  Also passes the
> unionmount-testsuite by David Howells.


Why the hell do you hold ->i_mutex across the entire opening of underlying
directory?  All you need is to serialize one assignment; the side that loses
the race will simply fput() what it opened...

Oh, well - that goes under "weird pessimisations, easy to fix in followups"...
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