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Date:   Thu, 26 Mar 2020 00:28:00 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Damien Le Moal <damien.lemoal@wdc.com>
Cc:     linux-block@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
        linux-scsi@vger.kernel.org,
        "Martin K . Petersen" <martin.petersen@oracle.com>
Subject: Re: [PATCH] block: all zones zone management operations
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On Thu, Mar 26, 2020 at 01:30:12PM +0900, Damien Le Moal wrote:
> Similarly to the zone write pointer reset operation (REQ_OP_ZONE_RESET),
> the zone open, close and finish operations can operate on all zones of a
> ZBC or ZAC SMR disk by setting the all bit of the command. Compared to a
> loop issuing a request for every zone of the device, the device based
> processing of an all zone operation is several orders of magnitude
> faster.

What is the point?  None of these actually seem like remotely useful
operations.  Why would I ever want to open or finish all zones?