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Date:   Wed, 25 Nov 2020 23:16:39 +0100
From:   David Sterba <dsterba@suse.cz>
To:     Naohiro Aota <naohiro.aota@wdc.com>
Cc:     linux-btrfs@vger.kernel.org, dsterba@suse.com, hare@suse.com,
        linux-fsdevel@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
        Christoph Hellwig <hch@infradead.org>,
        "Darrick J. Wong" <darrick.wong@oracle.com>,
        Damien Le Moal <damien.lemoal@wdc.com>,
        Josef Bacik <josef@toxicpanda.com>
Subject: Re: [PATCH v10 04/41] btrfs: get zone information of zoned block
 devices
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        "Darrick J. Wong" <darrick.wong@oracle.com>,
        Damien Le Moal <damien.lemoal@wdc.com>,
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References: <cover.1605007036.git.naohiro.aota@wdc.com>
 <cf46f0aef5a214cae8bacb2be231efed5febef5f.1605007036.git.naohiro.aota@wdc.com>
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On Tue, Nov 10, 2020 at 08:26:07PM +0900, Naohiro Aota wrote:
> +	/* Get zones type */
> +	while (sector < nr_sectors) {
> +		nr_zones = BTRFS_REPORT_NR_ZONES;
> +		ret = btrfs_get_dev_zones(device, sector << SECTOR_SHIFT, zones,
> +					  &nr_zones);
> +		if (ret)
> +			goto out;
> +
> +		for (i = 0; i < nr_zones; i++) {
> +			if (zones[i].type == BLK_ZONE_TYPE_SEQWRITE_REQ)
> +				set_bit(nreported, zone_info->seq_zones);
> +			if (zones[i].cond == BLK_ZONE_COND_EMPTY)
> +				set_bit(nreported, zone_info->empty_zones);

set_bit is atomic and it's not needed as nothing else could be touching
the bitmap, so I'll switch it to plain __set_bit.