blkdev_issue_discard (9)

int blkdev_issue_discard(struct block_device * bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);

bdev

blockdev to issue discard for

sector

start sector

nr_sects

number of sectors to discard

gfp_mask

memory allocation flags (for bio_alloc)

flags

BLKDEV_IFL_* flags to control behaviour

Issue a discard request for the sectors in question.