Re: PATCH: 2.6.10 - Still mishandles volumes without geometry data

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

On Mer, 2004-12-29 at 02:52, Andries Brouwer wrote:
> > +	/* No non-LBA info .. so valid! */
> > +	if (id->cyls == 0)
> > +		return 1;
> > +		
> >  	/*
> >  	 * The ATA spec tells large drives to return
> >  	 * C/H/S = 16383/16/63 independent of their size.
> 
> Reasonable in case this actually occurs. Do you have examples?

Yes - raid volumes on IT8212 is one such example.

> > -		pr_debug("%s: CHS=%u/%u/%u\n", drive->name, cyl, head, sect);
> > +		if(cyl)
> > +			pr_debug("%s: CHS=%u/%u/%u\n", drive->name, cyl, head, sect);
> >  
> >  		hwif->OUTB(0x00, IDE_FEATURE_REG);
> >  		hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
> 
> Unreasonable. This part must be a misunderstanding.
> The cyl here is not the number of cylinders of a disk,

Yep - as Bartlomiej correctly noted this was a mismerge when I fixed up
to 2.6.10

> > -	printk(", CHS=%d/%d/%d", 
> > -	       drive->bios_cyl, drive->bios_head, drive->bios_sect);
> > +	if(drive->bios_cyl)
> > +		printk(", CHS=%d/%d/%d", 
> > +			drive->bios_cyl, drive->bios_head, drive->bios_sect);
> >  	if (drive->using_dma)
> >  		ide_dma_verbose(drive);
> >  	printk("\n");
> 
> Reasonable. (But s/if(/if (/ .)
> On the other hand, I like the "CHS=0/0/0" - it makes very clear what is wrong
> in case lilo or so has geometry problems.

0/0/0 is valid in these cases - would it be better if it printed
something else instead for that situation ("No physical geometry, ")
perhaps ?