4.19-stable review patch. If anyone has any objections, please let me know.
------------------ From: Ming Lei <[email protected]> commit 1adfc5e4136f5967d591c399aff95b3b035f16b7 upstream. Obviously the created discard bio has to be aligned with logical block size. This patch introduces the helper of bio_allowed_max_sectors() for this purpose. Cc: [email protected] Cc: Mike Snitzer <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Xiao Ni <[email protected]> Cc: Mariusz Dabrowski <[email protected]> Fixes: 744889b7cbb56a6 ("block: don't deal with discard limit in blkdev_issue_discard()") Fixes: a22c4d7e34402cc ("block: re-add discard_granularity and alignment checks") Reported-by: Rui Salvaterra <[email protected]> Tested-by: Rui Salvaterra <[email protected]> Signed-off-by: Ming Lei <[email protected]> Signed-off-by: Jens Axboe <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- block/blk-lib.c | 3 +-- block/blk-merge.c | 3 ++- block/blk.h | 10 ++++++++++ 3 files changed, 13 insertions(+), 3 deletions(-) --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -58,8 +58,7 @@ int __blkdev_issue_discard(struct block_ if (!req_sects) goto fail; - if (req_sects > UINT_MAX >> 9) - req_sects = UINT_MAX >> 9; + req_sects = min(req_sects, bio_allowed_max_sectors(q)); end_sect = sector + req_sects; --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -27,7 +27,8 @@ static struct bio *blk_bio_discard_split /* Zero-sector (unknown) and one-sector granularities are the same. */ granularity = max(q->limits.discard_granularity >> 9, 1U); - max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9); + max_discard_sectors = min(q->limits.max_discard_sectors, + bio_allowed_max_sectors(q)); max_discard_sectors -= max_discard_sectors % granularity; if (unlikely(!max_discard_sectors)) { --- a/block/blk.h +++ b/block/blk.h @@ -329,6 +329,16 @@ static inline unsigned long blk_rq_deadl } /* + * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size + * is defined as 'unsigned int', meantime it has to aligned to with logical + * block size which is the minimum accepted unit by hardware. + */ +static inline unsigned int bio_allowed_max_sectors(struct request_queue *q) +{ + return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9; +} + +/* * Internal io_context interface */ void get_io_context(struct io_context *ioc);
