linux-kernel - Re: [PATCH 2/5] virtio_blk: remove the broken zone revalidation support

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Date: Mon, 18 Dec 2023 10:15:22 -0500
From: Stefan Hajnoczi <stefanha@...hat.com>
To: Christoph Hellwig <hch@....de>
Cc: Jens Axboe <axboe@...nel.dk>, Paolo Bonzini <pbonzini@...hat.com>,
	Damien Le Moal <dlemoal@...nel.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	dm-devel@...ts.linux.dev, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux.dev, linux-nvme@...ts.infradead.org,
	linux-scsi@...r.kernel.org, linux-btrfs@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/5] virtio_blk: remove the broken zone revalidation
 support

On Sun, Dec 17, 2023 at 05:53:56PM +0100, Christoph Hellwig wrote:
> virtblk_revalidate_zones is called unconditionally from
> virtblk_config_changed_work from the virtio config_changed callback.
> 
> virtblk_revalidate_zones is a bit odd in that it re-clears the zoned
> state for host aware or non-zoned devices, which isn't needed unless the
> zoned mode changed - but a zone mode change to a host managed model isn't
> handled at all, and virtio_blk also doesn't handle any other config
> change except for a capacity change is handled (and even if it was
> the upper layers above virtio_blk wouldn't handle it very well).
> 
> But even the useful case of a size change that would add or remove
> zones isn't handled properly as blk_revalidate_disk_zones expects the
> device capacity to cover all zones, but the capacity is only updated
> after virtblk_revalidate_zones.
> 
> As this code appears to be entirely untested and is getting in the way
> remove it for now, but it can be readded in a fixed version with
> proper test coverage if needed.
> 
> Fixes: 95bfec41bd3d ("virtio-blk: add support for zoned block devices")
> Fixes: f1ba4e674feb ("virtio-blk: fix to match virtio spec")
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  drivers/block/virtio_blk.c | 26 --------------------------
>  1 file changed, 26 deletions(-)

Fair enough.

Reviewed-by: Stefan Hajnoczi <stefanha@...hat.com>

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