Re: [PATCH] 2.5 ide 48-bit usage

Alan Cox
2003-05-07T19:15:15Z

On Mer, 2003-05-07 at 17:28, Linus Torvalds wrote:
> At least if I read the patch correctly, theer's no way for upper layers to
> say "I want 48-bit addressing" - it's just turned on automatically for
> high sectors (or big transfers).

You read it incorrectly. The lower layers don't know about the issue at
all. The disk layer does mapping (conceptually like READ6/READ10/READ16
in SCSI)

Raw I/O and other drivers can still issue CHS LBA28 and LBA48 taskfiles.

> Well, you can mark the drive itself as wanting 48-bit transfers, but you
> can't do it on a per-request basis.

Its per request at the low level.