linux-kernel - Re: simplify gendisk lookup and remove struct block

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Date:   Wed, 11 Nov 2020 09:17:55 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Christoph Hellwig <hch@....de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Denis Efremov <efremov@...ux.com>,
        "David S. Miller" <davem@...emloft.net>,
        Song Liu <song@...nel.org>, Al Viro <viro@...iv.linux.org.uk>,
        Finn Thain <fthain@...egraphics.com.au>,
        Michael Schmitz <schmitzmic@...il.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-ide@...r.kernel.org, linux-raid@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-m68k@...ts.linux-m68k.org
Subject: Re: simplify gendisk lookup and remove struct block_device aliases v4

On 10/29/20 8:58 AM, Christoph Hellwig wrote:
> Hi all,
> 
> this series removes the annoying struct block_device aliases, which can
> happen for a bunch of old floppy drivers (and z2ram).  In that case
> multiple struct block device instances for different dev_t's can point
> to the same gendisk, without being partitions.  The cause for that
> is the probe/get callback registered through blk_register_regions.
> 
> This series removes blk_register_region entirely, splitting it it into
> a simple xarray lookup of registered gendisks, and a probe callback
> stored in the major_names array that can be used for modprobe overrides
> or creating devices on demands when no gendisk is found.  The old
> remapping is gone entirely, and instead the 4 remaining drivers just
> register a gendisk for each operating mode.  In case of the two drivers
> that have lots of aliases that is done on-demand using the new probe
> callback, while for the other two I simply register all at probe time
> to keep things simple.
> 
> Note that the m68k drivers are compile tested only.

Applied, thanks.

-- 
Jens Axboe