linux-kernel - Re: dio_get_page() lockdep complaints

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Message-Id: <20070419094254.2b273d0c.akpm@linux-foundation.org>
Date:	Thu, 19 Apr 2007 09:42:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Vladimir V. Saveliev" <vs@...esys.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>, linux-kernel@...r.kernel.org,
	linux-aio@...ck.org, reiserfs-dev@...esys.com, linux-mm@...ck.org
Subject: Re: dio_get_page() lockdep complaints

On Thu, 19 Apr 2007 18:57:41 +0400 "Vladimir V. Saveliev" <vs@...esys.com> wrote:

> > It's a bit odd that reiserfs is playing with file contents within
> > file_operations.release(): there could be other files open against that
> > inode.  One would expect this sort of thing to be happening in an
> > inode_operation.  But it's been like that for a long time.
> > 
> 
> reiserfs needs to "pack" file tail when last process which opened a file closes it.
> Can you see more suitable place where that could be performed?

No, you're right - I got my ->release() and ->flush() mixed up.

Possibly one could perform this operation on the final iput(), but I suspect the
locking situation there would be even more complex.
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