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

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Message-Id: <E1KvbXx-0002dH-4j@pomaz-ex.szeredi.hu>
Date:	Thu, 30 Oct 2008 18:43:01 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	stern@...land.harvard.edu
CC:	miklos@...redi.hu, rjw@...k.pl, linux-kernel@...r.kernel.org,
	ncunningham@...a.org.au, linux-pm@...ts.linux-foundation.org
Subject: Re: [linux-pm] Freezer: Don't count threads waiting for frozen
 filesystems.

On Thu, 30 Oct 2008, Alan Stern wrote:
> Okay.  Don't forget things like ioctl for sockets -- they often involve 
> doing I/O directly to the network interface device.

Yeah, ioctls should probably just always be protected (at least
initially), regardless of what type of file they are done on.

> What happens to a task accessing a non-regular file on a fuse 
> filesystem?  :-)

The same as on any other filesystem, i.e. the fs is only involved as
far as calling init_special_inode(), the rest is taken care of by the
VFS.

Tejun Heo recently posted patches to fuse which enable emulating a
char device from userspace.  That is another matter, obviously we'd
want to keep the "allow suspend during I/O" property of fuse in that
case, even though there's a char device involved (but no hardware, at
least not on that level).

Miklos
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