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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 <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Javier Gonzalez <javier@javigon.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Damien Le Moal 2019-11-11 11:39:24 +09:00 committed by Jens Axboe
parent c98c3d09fc
commit ceeb373aa6
2 changed files with 5 additions and 35 deletions
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34
block/blk-zoned.c
View File

@ -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)

6
drivers/md/dm.c
View File

@ -473,12 +473,6 @@ static int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
goto out;
}
/*
* blkdev_report_zones() will loop and call this again to cover all the
* zones of the target, eventually moving on to the next target.
* So there is no need to loop here trying to fill the entire array
* of zones.
*/
ret = tgt->type->report_zones(tgt, sector, zones, nr_zones);
out: