linux-kernel - Re: [PATCH 2/3] Fix fsync livelock

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Message-ID: <Pine.LNX.4.64.0810060857341.26843@hs20-bc2-1.build.redhat.com>
Date:	Mon, 6 Oct 2008 09:00:14 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, agk@...hat.com, mbroz@...hat.com,
	chris@...chsys.com
Subject: Re: [PATCH 2/3] Fix fsync livelock

On Sun, 5 Oct 2008, Arjan van de Ven wrote:

> On Sun, 5 Oct 2008 23:30:51 -0400 (EDT
> > The point is that many fsync()s may run in parallel and you have just
> > one inode and just one chain. And if you add two-word list_head to a
> > page, to link it on this list, many developers will hate it for
> > increasing its size.
> 
> why to a page?
> a list head in the inode and chain up the bios....

And if you want to wait for a bio submitted by a different process? 
There's no way you can find the bio from the page.

> or not make an actual list but just a "is the previous one done" thing
> it's not all that hard to get something that works on a per inode basis,
> that gives "wait for all io upto this one".

So code it :)

Mikulas
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