From 1adfc5e4136f5967d591c399aff95b3b035f16b7 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Mon, 29 Oct 2018 20:57:17 +0800 Subject: [PATCH] block: make sure discard bio is aligned with logical block size 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: stable@vger.kernel.org Cc: Mike Snitzer Cc: Christoph Hellwig Cc: Xiao Ni Cc: Mariusz Dabrowski 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 Tested-by: Rui Salvaterra Signed-off-by: Ming Lei Signed-off-by: Jens Axboe --- block/blk-lib.c | 3 +-- block/blk-merge.c | 3 ++- block/blk.h | 10 ++++++++++ 3 files changed, 13 insertions(+), 3 deletions(-) diff --git a/block/blk-lib.c b/block/blk-lib.c index 76f867ea9a9b..d56fd159d2e8 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -57,8 +57,7 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 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; diff --git a/block/blk-merge.c b/block/blk-merge.c index 208658a901c6..e7696c47489a 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -90,7 +90,8 @@ static struct bio *blk_bio_discard_split(struct request_queue *q, /* 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)) { diff --git a/block/blk.h b/block/blk.h index c85e53f21cdd..0089fefdf771 100644 --- a/block/blk.h +++ b/block/blk.h @@ -395,6 +395,16 @@ static inline unsigned long blk_rq_deadline(struct request *rq) return rq->__deadline & ~0x1UL; } +/* + * 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 */