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From: Kyle Moffett <mrlinuxman@mac.com>
To: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: Eric Dumazet <dada1@cosmosbay.com>, Tomas M <tomas@slax.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] max_loop limit
Date: Wed, 28 Mar 2007 23:54:17 -0400	[thread overview]
Message-ID: <89DC3EEA-72A3-4F6A-9FD8-FD5D5010BE39@mac.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0703240023220.10028@yvahk01.tjqt.qr>

On Mar 23, 2007, at 19:26:34, Jan Engelhardt wrote:
> here's one. Allocates all the fluff dynamically. It does not create  
> any dev nodes by itself, so you need to do it (à la mdadm), but  
> you'll get all 1048576 available minors.
>
> +static LIST_HEAD(loop_devices);

Maybe an rbtree would work better here?  Maximum number of nodes  
traversed to get to the bottom of the tree given 2^(20) loop devices  
is 19 as opposed to the 2^(20) for a linked list.  Also, to preserve  
compatibility with existing userspace loop tools you should probably  
always allocate one extra loop device.  Keep a "highest used loopdev"  
number and create the one after that so that udev will autocreate a  
dev node for it.

Cheers,
Kyle Moffett


  parent reply	other threads:[~2007-03-29  4:02 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-22  7:57 Tomas M
2007-03-22 11:00 ` markus reichelt
2007-03-22 11:37   ` Tomas M
2007-03-22 13:42     ` Eric Dumazet
2007-03-22 13:42       ` Jens Axboe
2007-03-22 13:52         ` Eric Dumazet
2007-03-22 13:54           ` Jens Axboe
2007-03-22 14:11             ` William Lee Irwin III
2007-03-22 15:22               ` Arjan van de Ven
2007-03-22 16:09               ` Pádraig Brady
2007-03-28 23:34                 ` Karel Zak
     [not found]             ` <20070322151826.c1421851.dada1@cosmosbay.com>
     [not found]               ` <20070322142306.GU19922@kernel.dk>
     [not found]                 ` <20070322153603.1f5d442d.dada1@cosmosbay.com>
2007-03-22 15:31                   ` max_loop limit - paid job offer Tomas M
2007-03-22 14:33         ` max_loop limit Al Viro
2007-03-22 19:51           ` Olivier Galibert
2007-03-22 14:25       ` Tomas M
2007-03-23  1:34       ` Jan Engelhardt
2007-03-23 23:26         ` [PATCH] " Jan Engelhardt
2007-03-25  0:17           ` Ken Chen
2007-03-25  0:29           ` Ken Chen
2007-03-25  8:40           ` Tomas M
2007-03-28 23:41             ` Karel Zak
2007-03-29  3:54           ` Kyle Moffett [this message]
2007-03-29  4:16             ` [PATCH] max_loop limit, t2 Jan Engelhardt
2007-03-29  8:38               ` [PATCH] max_loop limit, loop.c final working version Tomas M
2007-03-29 14:16     ` max_loop limit Bill Davidsen

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