linux-kernel - Re: [RFC PATCH 1/4] init: move block device helpers from init/do

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Message-ID: <ZCWgAvLh6sNs03SW@makrotopia.org>
Date:   Thu, 30 Mar 2023 15:43:14 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Richard Weinberger <richard@....at>,
        Matthew Wilcox <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/4] init: move block device helpers from
 init/do_mounts.c

Hi Christoph,

On Tue, Nov 22, 2022 at 04:37:08AM -0800, Christoph Hellwig wrote:
> On Sat, Nov 19, 2022 at 04:03:11PM +0000, Daniel Golle wrote:
> > [...]
> > Yet another (imho not terrible) problem is removal of the lower device.
> > Many of the supported SBC use a micro SD card to boot, which can be
> > removed by the user while the system is running (which is generally not
> > a good idea, but anyway). For partitions this is handled automatically
> > by blk_drop_partitions() called directly from genhd.c.
> > I'm currently playing with doing something similar using the bus device
> > removal notification, but it doesn't seem to work for all cases, e.g.
> > mmcblk device do not seem to have the ->bus pointer populated at all
> > (ie. disk_to_dev(disk)->bus == NULL for mmcblk devices).
> 
> I have WIP patches that allow the claimer of a block device get
> resize and removal notification.  It's not going to land for 6.2,
> but I hope I have it ready in time for the next merge window.

Any news about that patchset? I'd happily review, test and use it ;)