linux-kernel - Re: [PATCH] VFS: make file->f_pos access atomic on 32bit arch

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Date:	Tue, 16 Sep 2008 16:01:39 +0000 (GMT)
From:	Michael Trimarchi <trimarchimichael@...oo.it>
To:	7eggert@....de, Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] VFS: make file->f_pos access atomic on 32bit arch

hi,



----- Messaggio originale -----
> Da: Bodo Eggert <7eggert@....de>
> A: Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>; akpm@...ux-foundation.org; linux-kernel@...r.kernel.org; linux-fsdevel@...r.kernel.org
> Inviato: Martedì 16 settembre 2008, 17:32:08
> Oggetto: Re: [PATCH] VFS: make file->f_pos access atomic on 32bit arch
> 
> Hisashi Hifumi wrote:
> 
> > Protecting file->f_pos with a lock adds some overhead but I think we should
> > fix this.
> > I used seqlock to serialize the access to file->f_pos. This approach is
> > similar to inode->i_size synchronization.
> > 
> > Comments?
> 
> > +             if (offset != file_pos_read(file))
> > +                     file_pos_write(file, offset);
> 
> Maybe file_pos_write should do this check?
> 
I agree :)

Regards Michael

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