linux-kernel - Re: [linux-pm] Freezer: Don't count threads waiting for frozen filesystems.

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Message-Id: <1225237298.9661.55.camel@nigel-laptop>
Date:	Wed, 29 Oct 2008 10:41:38 +1100
From:	Nigel Cunningham <ncunningham@...a.org.au>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] Freezer: Don't count threads waiting for
	frozen	filesystems.

Hi.

On Wed, 2008-10-29 at 00:24 +0100, Miklos Szeredi wrote:
> On Wed, 29 Oct 2008, Nigel Cunningham wrote:
> > Remember, though, that we're only freezing fuse at the moment, and
> > strictly one filesystem at a time. We can thus happily wait for the
> > i_mutex taken by some other process to be released.
> 
> Not going to work: you need to wait for all requests to be finished,
> but those might depend on some other fuse filesystem which has already
> been frozen.

Okay. In that case, am I right in thinking that the request waiting on
the frozen filesystem will be stuck in request_wait_answer, and the
userspace process that was trying to satisfy the request will be stuck
in the FUSE_MIGHT_FREEZE call that was invoked for the frozen
filesystem?

Regards,

Nigel

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