From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tejun Heo <tj@kernel.org>
Subject: Re: Problem w/ CONFIG_DEBUG_BLOCK_EXT_DEVT
Date: Tue, 02 Sep 2008 13:06:24 +0200
Message-ID: <48BD1E30.8040602@kernel.org>
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To: "Alan D. Brunelle" <Alan.Brunelle@hp.com>
Cc: device-mapper development <dm-devel@redhat.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Jens Axboe <jens.axboe@oracle.com>
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Alan D. Brunelle wrote:
>>> (2) Device minor numbers can be quite large, and the 10-character limits
>>> in dm/lib/libdm-deptree.c are too small.
>> Would it be difficult to increase that?
> 
> No, but knowing the upper bound would be helpful.

Well, dev_t is 32bits and MINORBITS is 20.  So, major 12 bits, minor 20
bits, so 4 characters for major, 7 characters for minor.

-- 
tejun