linux-kernel - Re: [PATCH] block: fix blk_get_backing_dev_info() crash, use bdev->bd

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Date:   Tue, 10 Jan 2017 16:57:51 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jan Kara <jack@...e.cz>
Cc:     Dan Williams <dan.j.williams@...el.com>, axboe@...com,
        Andi Kleen <ak@...ux.intel.com>,
        Rabin Vincent <rabinv@...s.com>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, linux-block@...r.kernel.org,
        Jeff Moyer <jmoyer@...hat.com>, Wei Fang <fangwei1@...wei.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] block: fix blk_get_backing_dev_info() crash, use
        bdev->bd_queue

On Fri, Jan 06, 2017 at 11:23:30AM +0100, Jan Kara wrote:
> So what I think needs to be done is that we make backing_dev_info
> independently allocated structure with different lifetime rules to gendisk
> or request_queue - definitely I want it to live as long as block device
> inode exists. However it needs more thought what the exact lifetime rules
> will be.

Yes, moving the backing dev out (or keeping the request_queue memoery alive)
is something we need to do.  And we need to look into the other half
of the backing_dev life time isssues - we need to make sure the name
and sysfs resources are released as soon as the devices goes away so that
we aren't going to run into reuse races.