linux-kernel - Re: [PATCH] fs/block_dev.c: Use hd

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Message-ID: <20140822174848.GA11819@infradead.org>
Date:	Fri, 22 Aug 2014 10:48:48 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Keith Busch <keith.busch@...el.com>
Cc:	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
	axboe@...nel.dk, willy@...ux.intel.com,
	nilesh.choudhury@...cle.com, indraneel.m@...sung.com,
	shiro.itou@...look.com
Subject: Re: [PATCH] fs/block_dev.c: Use hd_part to find block inodes

On Fri, Aug 22, 2014 at 10:28:16AM -0600, Keith Busch wrote:
> When using the GENHD_FL_EXT_DEVT disk flags, a newly added device may
> be assigned the same major/minor as one that was previously removed but
> opened, and the pesky userspace refuses to close it!

Which means life time rules for those dev_t allocations are broken.
Please fix it to not release the dev_t until the device isn't referenced
at all.

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