Re: [PATCH 07/13] block: Do not remove zone write plugs still in use

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On Tue, Apr 30, 2024 at 09:51:25PM +0900, Damien Le Moal wrote:
> Large write BIOs that span a zone boundary are split in
> blk_mq_submit_bio() before being passed to blk_zone_plug_bio() for zone
> write plugging. Such split BIO will be chained with one fragment
> targeting one zone and the remainder of the BIO tergetting the next

s/tergetting/targetting/

> Fix this by modifying disk_should_remove_zone_wplug() to check that the
> reference count to a zone write plug is not larger than 2, that is, that
> the only references left on the zone are the caller held reference
> (blk_zone_write_plug_complete_request()) and the initial extra reference
> for the zone write plug taken when it was initialized (and that is
> dropped when the zone write plug is removed from the hash table).

How is this atomic_read() based check not racy?





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