On Sun, Jun 28, 2015 at 12:52:11PM -0700, Linus Torvalds wrote:
> On Sun, Jun 28, 2015 at 6:16 AM, Mikulas Patocka <miku...@twibright.com>
> wrote:
> > This patch adds support for fstrim to the HPFS filesystem.
> ...
> > +#ifdef CONFIG_COMPAT
> > + .compat_ioctl = hpfs_compat_ioctl,
> > +#endif
> ...
> > +#ifdef CONFIG_COMPAT
> > + .compat_ioctl = hpfs_compat_ioctl,
> > +#endif
> ...
> > +#ifdef CONFIG_COMPAT
> > +long hpfs_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
> > +{
> > + return hpfs_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
> > +}
> > +#endif
>
> Hmm. You've clearly copied this pattern from other filesystems, and so
> I can't really blame you, but this thing annoys me a lot.
>
> Why isn't FITRIM just marked as a COMPATIBLE_IOCTL(), at which point
> the generic ioctl layer will do exactly the above translation for us?
>
> Am I missing something?
More to the point, why bother with ->ioctl() at all? Why not make
->fitrim() a super_block method and let do_vfs_ioctl() handle all
marshalling? As in
(int *)fitrim(struct super_block *, struct fstrim_range *);
guaranteed to be called only on a filesystem kept active by caller...
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