Date: Tue, 30 Mar 2004 20:51:29 +0200
From: Andrea Arcangeli <andrea@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org, hugh@veritas.com
Subject: Re: mapped pages being truncated [was Re: 2.6.5-rc2-aa5]
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On Tue, Mar 30, 2004 at 10:28:34AM -0800, Andrew Morton wrote:
> Andrea Arcangeli <andrea@suse.de> wrote:
> >
> > here we go, my new debugging WARN_ON in in __remove_from_page_cache
> >  triggered just before the other one in page_remove_rmap, as I expected
> >  it was truncate removing pages from pagecache before all mappings were
> >  dropped:
> 
> XFS is doing peculiar things - xfs_setattr calls truncate_inode_pages()
> before running vmtruncate().
> 
> 	xfs_setattr
> 	->xfs_itruncate_start
> 	  ->VOP_TOSS_PAGES
> 	    ->fs_tosspages
> 	      ->truncate_inode_pages

Ok, so objrmap needs my WARN_ON changes to survive the above. I believe
I can close the bug as fixed now (however I will leave the WARN_ON in
the code).

Still xfs seems pretty broken doing the above.
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