linux-kernel - Re: 2.6.20-rc4: known unfixed regressions (v2)

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Date:	Thu, 11 Jan 2007 16:12:40 +0300
From:	"Vladimir V. Saveliev" <vs@...esys.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	reiserfs-dev@...esys.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.20-rc4: known unfixed regressions (v2)

Hello

On Thursday 11 January 2007 04:00, Nick Piggin wrote:
> Vladimir V. Saveliev wrote:
> > Hello
> > 
> > On Tuesday 09 January 2007 21:30, Linus Torvalds wrote:
> > 
> >>On Tue, 9 Jan 2007, Malte Schröder wrote:
> >>
> >>>>So something interesting is definitely going on, but I don't know exactly
> >>>>what it is. Why does reiserfs do the truncate as part of a close, if the
> >>>>same inode is actually mapped somewhere else? 
> > 
> > 
> > on file close reiserfs tries to "pack" content of last incomplete page of file into metadata blocks.
> > It should not if that page is still mapped somewhere. 
> > It does not actually truncate, it calls the same function which does truncate, but file size does not change.
> 
> That's racy, unfortunately :P
> 

Sorry, please, explain what is racy.
reiserfs_truncate and reiserfs_release call that function after they have inode's mutex locked.

> > 
> > Please consider the below patch.
> 
> That seems like it would work. Probably papers over your truncate-inside-i_size as well.
> 
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