linux-kernel - Re: [dm-devel] [PATCH 0/2] block layer filter and block device snapshot module

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Message-ID: <20201023111253.GA22468@infradead.org>
Date:   Fri, 23 Oct 2020 12:12:53 +0100
From:   "hch@...radead.org" <hch@...radead.org>
To:     Hannes Reinecke <hare@...e.de>
Cc:     "hch@...radead.org" <hch@...radead.org>,
        Mike Snitzer <snitzer@...hat.com>,
        "jack@...e.cz" <jack@...e.cz>,
        "gustavo@...eddedor.com" <gustavo@...eddedor.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        device-mapper development <dm-devel@...hat.com>,
        "pavel@....cz" <pavel@....cz>, "steve@....org" <steve@....org>,
        "osandov@...com" <osandov@...com>,
        Alasdair G Kergon <agk@...hat.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        "len.brown@...el.com" <len.brown@...el.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "ming.lei@...hat.com" <ming.lei@...hat.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        Sergei Shtepa <sergei.shtepa@...am.com>,
        "koct9i@...il.com" <koct9i@...il.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        Damien Le Moal <Damien.LeMoal@....com>,
        Johannes Thumshirn <Johannes.Thumshirn@....com>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
        "tj@...nel.org" <tj@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [dm-devel] [PATCH 0/2] block layer filter and block device
 snapshot module

On Fri, Oct 23, 2020 at 12:31:05PM +0200, Hannes Reinecke wrote:
> My thoughts went more into the direction of hooking into ->submit_bio,
> seeing that it's a NULL pointer for most (all?) block drivers.
> 
> But sure, I'll check how the interposer approach would turn out.

submit_bio is owned by the underlying device, and for a good reason
stored in a const struct..