linux-kernel - Re: [RFC] block: check partition alignment

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Message-ID: <20161215084553.GA19716@infradead.org>
Date:   Thu, 15 Dec 2016 00:45:53 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Damien Le Moal <damien.lemoal@....com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Stefan Haberland <sth@...ux.vnet.ibm.com>, axboe@...nel.dk,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        hoeppner@...ux.vnet.ibm.com, sebott@...ux.vnet.ibm.com
Subject: Re: [RFC] block: check partition alignment

On Thu, Dec 15, 2016 at 10:33:47AM +0900, Damien Le Moal wrote:
> For a regular block device, I agree. But in Stephan case, I think that
> the check really needs to be against the physical block size, with the
> added condition that the bdev is a DASD device (similarly to the zone
> alignment check for zoned block devices).

Then they need to expose a chunk_size.  physical block size is defined
as not having a meaning for the kernel.