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

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Message-ID: <4706C177.3010100@zytor.com>
Date:	Fri, 05 Oct 2007 15:57:59 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [code] Unlimited partitions, a try

Jan Engelhardt wrote:
> 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_.

Yes, but you're proposing something with substantially higher switch 
threshold...

	-hpa
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