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From:   Christoph Hellwig <hch@lst.de>
To:     Jens Axboe <axboe@kernel.dk>
Cc:     Tejun Heo <tj@kernel.org>, linux-block@vger.kernel.org,
        Ming Lei <ming.lei@redhat.com>
Subject: tear down file system I/O in del_gendisk
Date:   Mon, 20 Sep 2021 13:24:01 +0200
Message-Id: <20210920112405.1299667-1-hch@lst.de>
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Ming reported that for SCSI we have a lifetime problem now that
the BDI moved from the request_queue to the disk as del_gendisk
doesn't finish all outstanding file system I/O.  It turns out
this actually is an older problem, although the case where it could
be hit before was very unusual (unbinding of a SCSI upper driver
while the scsi_device stays around).  This series fixes this by
draining all I/O in del_gendisk.