Messages in this thread | | | Date | Thu, 10 Aug 2006 00:18:57 +0200 | From | Adrian Bunk <> | Subject | Re: /dev/sd* |
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On Wed, Aug 09, 2006 at 11:01:43PM +0100, Alan Cox wrote: > Ar Mer, 2006-08-09 am 23:21 +0200, ysgrifennodd Adrian Bunk: > > It might be a bit out of the scope of this thread, but why do some many > > subsystems use the /dev/sd* namespace? > > > > Real SCSI devices use it. > > The USB mass storage driver uses it. > > USB storage is real SCSI.
Real SCSI for a developer, for a user it's USB.
And things become even more confusing considering that the drive might show up as /dev/sda or /dev/uba depending on the driver used.
> > libata uses it. > > > > I'd expext SATA or PATA devices at /dev/hd* or perhaps at /dev/ata* - > > but why are they at /dev/sd*? > > ATA uses the top half of the scsi stack so ends up using the top layer > scsi drivers. Its probably more efficient than writing new driver > clones, especially as non disk ATA is also real SCSI (or very close).
You are talking about kernel<->kernel and kernel<->hardware interfaces.
I'm more concerned about the kernel<->userspace interface.
> You can use /dev/ata if you want - its just a udev problem ;)
Or by adding some manual links if using a static /dev.
But I'm still not getting the point why the /dev/sd* namespace has to be used.
> Alan
cu Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out of the darkness. There had been need of rain for many days. "Only a promise," Lao Er said. Pearl S. Buck - Dragon Seed
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