Move all the logic to limit the discard bio size into a common helper
so that it is better documented.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Acked-by: NColy Li <colyli@suse.de>
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-23-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>