linux-kernel - Finding a free range (idr, blockdev)

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Message-ID: <Pine.LNX.4.64.0710041957500.13406@fbirervta.pbzchgretzou.qr>
Date:	Thu, 4 Oct 2007 20:04:14 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Finding a free range (idr, blockdev)

Hi,

I'd like to register a blkdev region, much like

	blk_register_region(MKDEV(major, first_minor), number_minors, 
		            xmodule, xprobe, xlock, xdata);

number_minors is known, but how do I decide what first_minor to use?
Module owns the full major number, so I thought I could use an idr map,
but there does not seem to be a function that marks a range used.
(Something along idr_get_new_range(&my_idr, ptr, &new_id, range_len)
would have been cool.)
Ideas on how to proceed?

Thanks,
Jan
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