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From:   Christoph Hellwig <hch@lst.de>
To:     Jens Axboe <axboe@kernel.dk>
Cc:     linux-block@vger.kernel.org
Subject: cleanup bio page releasing and fix a page leak
Date:   Thu,  2 May 2019 19:33:24 -0400
Message-Id: <20190502233332.28720-1-hch@lst.de>
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Hi Jens,

this series cleans up the various direct I/O and pass through
routines by switching them over to common bio helpers.  For
the block device simple case this also fixes a page leak
if we were using bvec iters.

The last page just unconditionally applies the no page ref
behavior for bvec iters.  I looked at all the callers, and
there is none that drops the pre-required references before
completing the request.  Probably not suitable for so late
in the merge, but I wanted to get it out.