linux-kernel - Re: [PATCH v12 13/13] dm: add power-of-2 target for zoned devices with non power-of-2 zone sizes

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Date:   Fri, 2 Sep 2022 14:05:00 +0200
From:   Pankaj Raghav <p.raghav@...sung.com>
To:     <agk@...hat.com>, <snitzer@...nel.org>, <axboe@...nel.dk>,
        <damien.lemoal@...nsource.wdc.com>, <hch@....de>
CC:     <pankydev8@...il.com>, <Johannes.Thumshirn@....com>,
        <linux-block@...r.kernel.org>, <dm-devel@...hat.com>,
        <hare@...e.de>, <jaegeuk@...nel.org>,
        <linux-kernel@...r.kernel.org>, <matias.bjorling@....com>,
        <gost.dev@...sung.com>, <bvanassche@....org>,
        <linux-nvme@...ts.infradead.org>,
        Damien Le Moal <damien.lemoal@....com>
Subject: Re: [PATCH v12 13/13] dm: add power-of-2 target for zoned devices
 with non power-of-2 zone sizes

On 2022-08-23 14:18, Pankaj Raghav wrote:

> +static int dm_po2z_iterate_devices(struct dm_target *ti,
> +				   iterate_devices_callout_fn fn, void *data)
> +{
> +	struct dm_po2z_target *dmh = ti->private;
> +	sector_t len = dmh->nr_zones * dmh->zone_size;
> +
> +	return fn(ti, dmh->dev, 0, len, data);
> +}
> +
> +static struct target_type dm_po2z_target = {
> +	.name = "po2zone",
> +	.version = { 1, 0, 0 },
> +	.features = DM_TARGET_ZONED_HM | DM_TARGET_EMULATED_ZONES,

This target also supports DM_TARGET_NOWAIT feature flag. I will add it in
the next version.

> +	.map = dm_po2z_map,
> +	.end_io = dm_po2z_end_io,
> +	.report_zones = dm_po2z_report_zones,
> +	.iterate_devices = dm_po2z_iterate_devices,
> +	.module = THIS_MODULE,
> +	.io_hints = dm_po2z_io_hints,
> +	.ctr = dm_po2z_ctr,
> +};
> +
> +static int __init dm_po2z_init(void)
> +{
> +	return dm_register_target(&dm_po2z_target);
> +}
> +
> +static void __exit dm_po2z_exit(void)
> +{
> +	dm_unregister_target(&dm_po2z_target);
> +}
> +
> +/* Module hooks */
> +module_init(dm_po2z_init);
> +module_exit(dm_po2z_exit);
> +
> +MODULE_DESCRIPTION(DM_NAME "power-of-2 zoned target");
> +MODULE_AUTHOR("Pankaj Raghav <p.raghav@...sung.com>");
> +MODULE_LICENSE("GPL");
> +