Re: Sparse minor space in ub

[Pete Zaitcev]

On Fri, 16 Jun 2006 16:09:29 -0700, Greg KH <greg@xxxxxxxxx> wrote:

> > -		8 = /dev/ubb		Second USB block device
> > +		 16 = /dev/ubb		Second USB block device

> I don't think that distros that have a static /dev will like this change
> at all :(

That was an erroneous change in the documentation, I'm sorry.
In reality, everything is fully compatible. This is with the new
driver:

[zaitcev@lembas ~]$ ls -l /dev/ub*
brw-r----- 1 root disk 180,   0 Jun 14 23:18 /dev/uba
brw-r----- 1 root disk 180,   1 Jun 14 23:18 /dev/uba1
brw-r----- 1 root disk 180,   8 Jun 14 23:18 /dev/ubb
brw-r----- 1 root disk 180,   9 Jun 14 23:18 /dev/ubb1
brw-r----- 1 root disk 180,  10 Jun 14 23:18 /dev/ubb2
brw-r----- 1 root disk 180,  13 Jun 14 23:18 /dev/ubb5
brw-r----- 1 root disk 180,  14 Jun 14 23:18 /dev/ubb6
brw-r----- 1 root disk 180,  15 Jun 14 23:18 /dev/ubb7
brw-r----- 1 root disk 180, 264 Jun 14 23:18 /dev/ubb8
brw-r----- 1 root disk 180, 265 Jun 14 23:18 /dev/ubb9
[zaitcev@lembas ~]$

 /*
- */
+ * The minor layout is:
+ *   19 - 11  0xFF800
+ *   10 -  8    0x700   Upper 3 bits of partition number
+ *    7 -  3     0xF8   Host index, or same as "id". UB_MAX_HOSTS fit here.
+ *    2 -  0      0x7   Lower 3 bits of partition number
+ */

-- Pete
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