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block: rework zone reporting

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Avoid the need to allocate a potentially large array of struct blk_zone
in the block layer by switching the ->report_zones method interface to
a callback model. Now the caller simply supplies a callback that is
executed on each reported zone, and private data for it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2019-11-11 11:39:30 +09:00
committed by Jens Axboe
parent 23a50861ad
commit d41003513e
12 changed files with 346 additions and 464 deletions
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20
drivers/md/dm-linear.c
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@@ -136,21 +136,15 @@ static int linear_prepare_ioctl(struct dm_target *ti, struct block_device **bdev
}
#ifdef CONFIG_BLK_DEV_ZONED
static int linear_report_zones(struct dm_target *ti, sector_t sector,
struct blk_zone *zones, unsigned int *nr_zones)
static int linear_report_zones(struct dm_target *ti,
struct dm_report_zones_args *args, unsigned int nr_zones)
{
struct linear_c *lc = (struct linear_c *) ti->private;
int ret;
struct linear_c *lc = ti->private;
sector_t sector = linear_map_sector(ti, args->next_sector);
/* Do report and remap it */
ret = blkdev_report_zones(lc->dev->bdev, linear_map_sector(ti, sector),
zones, nr_zones);
if (ret != 0)
return ret;
if (*nr_zones)
dm_remap_zone_report(ti, lc->start, zones, nr_zones);
return 0;
args->start = lc->start;
return blkdev_report_zones(lc->dev->bdev, sector, nr_zones,
dm_report_zones_cb, args);
}
#endif