Re: [GIT PULL] overlay filesystem v25

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On Fri, Oct 24, 2014 at 01:25:39AM +0200, Miklos Szeredi wrote:
> Linus,
> 
> Please pull
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.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.

*blink*

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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