Re: [PATCH] support HDIO_GET_IDENTITY in libata

[Jeff Garzik <jeff@garzik.org>]

Alexey Dobriyan wrote:
> On Thu, Dec 14, 2006 at 01:26:08PM -0700, Erik Andersen wrote:
> > On Thu Dec 14, 2006 at 03:05:52PM -0500, Jeff Garzik wrote:
> > > FWIW, libata generally follows a "implement it, if enough people care
> > > about it" policy for the old HDIO_xxx ioctls.
> > I personally care about HDIO_GET_IDENTITY and find it terribly
> > useful to quickly find out about a drive.  Perhaps enough other
> > people care about this ioctl that it might make it into the official
> > libata tree.  Well tested with a number of months of use.
>
> > --- orig/drivers/ata/libata-scsi.c
> > +++ linux-2.6.18/drivers/ata/libata-scsi.c
> > @@ -303,6 +303,172 @@
> >  	return rc;
> >  }
> >
> > +static void ide_fixstring (u8 *s, const int bytecount)
> > +{
> > +	u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
> > +
> > +#ifndef __BIG_ENDIAN
> > +# ifdef __LITTLE_ENDIAN
> > +	/* convert from big-endian to host byte order */
> > +	for (p = end ; p != s;) {
> > +		unsigned short *pp = (unsigned short *) (p -= 2);
> > +		*pp = ntohs(*pp);
> > +	}
> > +# else
> > +#  error "Please fix <asm/byteorder.h>"
> > +# endif
> > +#endif
>
> Ugly. ntohs() will work on BE arches also.
>
> > +static void ide_fix_driveid (struct hd_driveid *id)
> > +{
> > +#ifndef __LITTLE_ENDIAN
> > +# ifdef __BIG_ENDIAN
>
> Ditto.

Agreed...

	Jeff



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