[dm-devel] [PATCH v3 01/11] block: improve handling of all zones reset operation

[Chaitanya Kulkarni]

On 5/20/21 20:01, Damien Le Moal wrote:
> +static int blkdev_zone_reset_all_emulated(struct block_device *bdev,
> +					  gfp_t gfp_mask)
> +{
> +	struct request_queue *q = bdev_get_queue(bdev);
> +	sector_t capacity = get_capacity(bdev->bd_disk);
> +	sector_t zone_sectors = blk_queue_zone_sectors(q);
> +	unsigned long *need_reset;
> +	struct bio *bio = NULL;
> +	sector_t sector;
> +	int ret;
> +
> +	need_reset = blk_alloc_zone_bitmap(q->node, q->nr_zones);
> +	if (!need_reset)
> +		return -ENOMEM;
> +
> +	ret = bdev->bd_disk->fops->report_zones(bdev->bd_disk, 0,
> +				q->nr_zones, blk_zone_need_reset_cb,
> +				need_reset);
> +	if (ret < 0)
> +		goto out_free_need_reset;
> +
> +	ret = 0;
> +	while (sector < capacity) {

Garbage value of sector variable used in above comparison ?
If so consider initializing at the time of declaration.

> +		if (!test_bit(blk_queue_zone_no(q, sector), need_reset)) {
> +			sector += zone_sectors;
> +			continue;
> +		}
> +		bio = blk_next_bio(bio, 0, gfp_mask);
> +		bio_set_dev(bio, bdev);
> +		bio->bi_opf = REQ_OP_ZONE_RESET | REQ_SYNC;
> +		bio->bi_iter.bi_sector = sector;
> +		sector += zone_sectors;
> +
> +		/* This may take a while, so be nice to others */
> +		cond_resched();
> +	}
> +
> +	if (bio) {
> +		ret = submit_bio_wait(bio);
> +		bio_put(bio);
> +	}
> +
> +out_free_need_reset:
> +	kfree(need_reset);
> +	return ret;
> +}