From ceeb373aa6b9eb75ed3278d4b3ff2318c304e70c Mon Sep 17 00:00:00 2001 From: Damien Le Moal Date: Mon, 11 Nov 2019 11:39:24 +0900 Subject: block: Simplify report zones execution All kernel users of blkdev_report_zones() as well as applications use through ioctl(BLKZONEREPORT) expect to potentially get less zone descriptors than requested. As such, the use of the internal report zones command execution loop implemented by blk_report_zones() is not necessary and can even be harmful to performance by causing the execution of inefficient small zones report command to service the reminder of a requested zone array. This patch removes blk_report_zones(), simplifying the code. Also remove a now incorrect comment in dm_blk_report_zones(). Signed-off-by: Damien Le Moal Reviewed-by: Christoph Hellwig Reviewed-by: Javier Gonzalez Reviewed-by: Hannes Reinecke Signed-off-by: Jens Axboe --- block/blk-zoned.c | 34 +++++----------------------------- 1 file changed, 5 insertions(+), 29 deletions(-) (limited to 'block') diff --git a/block/blk-zoned.c b/block/blk-zoned.c index 523a28d7a15c..ea4e086ba00e 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -119,31 +119,6 @@ static bool blkdev_report_zone(struct block_device *bdev, struct blk_zone *rep) return true; } -static int blk_report_zones(struct gendisk *disk, sector_t sector, - struct blk_zone *zones, unsigned int *nr_zones) -{ - struct request_queue *q = disk->queue; - unsigned int z = 0, n, nrz = *nr_zones; - sector_t capacity = get_capacity(disk); - int ret; - - while (z < nrz && sector < capacity) { - n = nrz - z; - ret = disk->fops->report_zones(disk, sector, &zones[z], &n); - if (ret) - return ret; - if (!n) - break; - sector += blk_queue_zone_sectors(q) * n; - z += n; - } - - WARN_ON(z > *nr_zones); - *nr_zones = z; - - return 0; -} - /** * blkdev_report_zones - Get zones information * @bdev: Target block device @@ -164,6 +139,7 @@ int blkdev_report_zones(struct block_device *bdev, sector_t sector, struct blk_zone *zones, unsigned int *nr_zones) { struct request_queue *q = bdev_get_queue(bdev); + struct gendisk *disk = bdev->bd_disk; unsigned int i, nrz; int ret; @@ -175,7 +151,7 @@ int blkdev_report_zones(struct block_device *bdev, sector_t sector, * report_zones method. If it does not have one defined, the device * driver has a bug. So warn about that. */ - if (WARN_ON_ONCE(!bdev->bd_disk->fops->report_zones)) + if (WARN_ON_ONCE(!disk->fops->report_zones)) return -EOPNOTSUPP; if (!*nr_zones || sector >= bdev->bd_part->nr_sects) { @@ -185,8 +161,8 @@ int blkdev_report_zones(struct block_device *bdev, sector_t sector, nrz = min(*nr_zones, __blkdev_nr_zones(q, bdev->bd_part->nr_sects - sector)); - ret = blk_report_zones(bdev->bd_disk, get_start_sect(bdev) + sector, - zones, &nrz); + ret = disk->fops->report_zones(disk, get_start_sect(bdev) + sector, + zones, &nrz); if (ret) return ret; @@ -561,7 +537,7 @@ int blk_revalidate_disk_zones(struct gendisk *disk) while (z < nr_zones) { nrz = min(nr_zones - z, rep_nr_zones); - ret = blk_report_zones(disk, sector, zones, &nrz); + ret = disk->fops->report_zones(disk, sector, zones, &nrz); if (ret) goto out; if (!nrz) -- cgit v1.2.3