linux-kernel - Re: [RFC][PATCH -mm] PM: Do not sync filesystems from within the freezer

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Message-Id: <200707061914.02972.nigel@nigel.suspend2.net>
Date:	Fri, 6 Jul 2007 19:13:56 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	benh@...nel.crashing.org, nigel@...pend2.net, rjw@...k.pl,
	pavel@....cz, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, mjg59@...f.ucam.org,
	oliver@...kum.org, paulus@...ba.org, mingo@...e.hu
Subject: Re: [RFC][PATCH -mm] PM: Do not sync filesystems from within the freezer

Hi.

On Friday 06 July 2007 19:05:53 Miklos Szeredi wrote:
> > On Fri, 2007-07-06 at 09:13 +0200, Miklos Szeredi wrote:
> > > 
> > > Another myth, that has been debunked already.  The problem is: how do
> > > you define fuse processes?  There's no theoretical or even practial
> > > way to do that.
> > 
> > It could if they told the kernel via some black magic ...
> > 
> > But that still suck. The freezer sucks :-)
> 
> Yeah, and it wouldn't work in practice, since the auxilary tasks might
> be part of a library which is not even aware of being used by a "fuse
> task".

This is why I think the whole concept of filesystems in userspace is broken. 
Trying to shift things that need special privilege and special handling to 
userspace is just asking for trouble. You can say it's the kernel code's 
fault, but then you have to explain why it's only fuse (yeah ok, and XFS) 
that have problems.

Regards,

Nigel
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