Re: [PATCH v3 02/15] block: freeze queue when updating zone resources

[Hannes Reinecke <hare@suse.de>]

On 11/4/25 02:31, Damien Le Moal wrote:
> Modify disk_update_zone_resources() to freeze the device queue before
> updating the number of zones, zone capacity and other zone related
> resources. The locking order resulting from the call to
> queue_limits_commit_update_frozen() is preserved, that is, the queue
> limits lock is first taken by calling queue_limits_start_update() before
> freezing the queue, and the queue is unfrozen after executing
> queue_limits_commit_update(), which replaces the call to
> queue_limits_commit_update_frozen().
> 
> This change ensures that there are no in-flights I/Os when the zone
> resources are updated due to a zone revalidation. In case of error when
> the limits are applied, directly call disk_free_zone_resources() from
> disk_update_zone_resources() while the disk queue is still frozen to
> avoid needing to freeze & unfreeze the queue again in
> blk_revalidate_disk_zones(), thus simplifying that function code a
> little.
> 
> Fixes: 0b83c86b444a ("block: Prevent potential deadlock in blk_revalidate_disk_zones()")
> Cc: stable@vger.kernel.org
> Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
> ---
>   block/blk-zoned.c | 42 ++++++++++++++++++++++++------------------
>   1 file changed, 24 insertions(+), 18 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@suse.de                                +49 911 74053 688
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