linux-kernel - Re: max

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Message-ID: <460BCB1D.9030806@tmr.com>
Date:	Thu, 29 Mar 2007 10:20:13 -0400
From:	Bill Davidsen <davidsen@....com>
To:	roland <devzero@....de>
CC:	linux-kernel@...r.kernel.org
Subject: Re: max_loop limit

roland wrote:
> partitions on loop or device-mapper devices ?
> 
> you can use kpartx tool for this.
> 
> bryn m. reeves told me, that it's probably poissible to create udev 
> rules that will automatically create partition maps when a new loop 
> device is setup, which is better than adding partitioning logig into 
> dm-loop for example.

It is certainly possible to create a partitionable RAID device from a 
loop device. Should be possible to use nbd as well, but I can't seem to 
get nbd to work on 2.6.21-rc (my working system runs 2.6.17).
> 
> example:
>> kpartx -a /dev/mapper/loop0
>>
>> # ls /dev/mapper/loop0*
>> /dev/mapper/loop0  /dev/mapper/loop0p1  /dev/mapper/loop0p2
>> /dev/mapper/loop0p3
> 
> i have seen a patch for loop.c doing this, though. search the archives 
> for this
> 
> regards
> roland
> 
> 
> 
> 
> 
> On Thu, Mar 22, 2007 at 02:33:14PM +0000, Al Viro wrote:
>> Correction: current ABI is crap.  To set the thing up you need to open
>> it and issue an ioctl.  Which is a bloody bad idea, for obvious 
>> reasons...
> 
> Agreed.  What would be a right way?  Global device ala ptmx/tun/tap?
> New syscall?  Something else?
> 
>  OG.
> -
> ]


-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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