linux-kernel - Re: [code] Unlimited partitions, a try

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Message-ID: <Pine.LNX.4.64.0710060022530.18723@fbirervta.pbzchgretzou.qr>
Date:	Sat, 6 Oct 2007 00:27:17 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [code] Unlimited partitions, a try

On Oct 5 2007 15:11, H. Peter Anvin wrote:
> Jan Engelhardt wrote:
>> 15 partitions (at least for sd_mod devices) are too few.
>
> Now when we have 20-bit minors, can't we simply recycle some of the 
> higher bits for additional partitions, across the board?  63 
> partitions seem to have been sufficient; at least I haven't heard 
> anyone complain about that for 15 years.

GPT allows up to 128 partitions, and the linux partition code currently 
allows for up to MAX_PART (256). Assuming 1048576/128, that would give 
8192 disks. With dynamic minor allocation and reuse, all that goes away 
and the limit becomes a bit less than 1048576 _partitions_.
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