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

[Michael Trimarchi]

hi,



----- Messaggio originale -----
> Da: Bodo Eggert <7eggert@xxxxxx>
> A: Hisashi Hifumi <hifumi.hisashi@xxxxxxxxxxxxx>; akpm@xxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-fsdevel@xxxxxxxxxxxxxxx
> 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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