Re: [PATCH v2 5/7] block: allow submitting all zone writes from a single context

[Christoph Hellwig <hch@infradead.org>]

On Thu, Feb 26, 2026 at 01:10:22PM +0900, Damien Le Moal wrote:
> limits the maximum size of commands to a small value, e.g. HBAs
> controlled with the mpi3mr driver limit commands to a maximum of 1 MiB.
> In such case, the write throughput gains are over 40%.

Nice numbers!  Although it's a bit sad that HBA capabilities are
actually degrading with new products.

> +static ssize_t queue_zoned_qd1_writes_store(struct gendisk *disk,
> +					    const char *page, size_t count)
> +{
> +	struct request_queue *q = disk->queue;
> +	unsigned long qd1_writes;
> +	unsigned int memflags;
> +	ssize_t ret;
> +
> +	if (!blk_queue_is_zoned(q))
> +		return -EOPNOTSUPP;

I think with the attr visibility check the non-zoned case here can't
actually happen.

Otherwise this looks beautiful, thanks!

Reviewed-by: Christoph Hellwig <hch@lst.de>