linux-kernel - Re: [PATCH] block: Don't allow illegal discard requests

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Date:	Wed, 4 Nov 2015 03:30:19 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Jan Kara <jack@...e.com>
Cc:	axboe@...nel.dk, LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] block: Don't allow illegal discard requests

On Wed, Nov 04, 2015 at 10:18:41AM +0100, Jan Kara wrote:
> Currently blkdev_issue_discard() doesn't check that submitted discard
> request matches granularity required by the underlying device.
> Submitting such requests to the device can have unexpected consequences
> (e.g. brd driver just discards more / less data depending on how exactly
> the request is aligned). So test that submitted discard request has the
> granularity required by the driver.

How is this going to work with stacked drivers?  I think brd needs to
be fixed to take care of the granularity itself, just like we did for
request based drivers.
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