From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Jens Axboe To: linux-block@vger.kernel.org, linux-xfs@vger.kernel.org Cc: dchinner@redhat.com, hch@lst.de, Jens Axboe Subject: [PATCH 1/4] block: break discard submissions into the user defined size Date: Mon, 7 May 2018 10:13:32 -0600 Message-Id: <1525709615-14395-2-git-send-email-axboe@kernel.dk> In-Reply-To: <1525709615-14395-1-git-send-email-axboe@kernel.dk> References: <1525709615-14395-1-git-send-email-axboe@kernel.dk> List-ID: Don't build discards bigger than what the user asked for, if the user decided to limit the size by writing to 'discard_max_bytes'. Signed-off-by: Jens Axboe --- block/blk-lib.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/block/blk-lib.c b/block/blk-lib.c index a676084d4740..7417d617091b 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -62,10 +62,11 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, unsigned int req_sects; sector_t end_sect, tmp; - /* Make sure bi_size doesn't overflow */ - req_sects = min_t(sector_t, nr_sects, UINT_MAX >> 9); + /* Issue in chunks of the user defined max discard setting */ + req_sects = min_t(sector_t, nr_sects, + q->limits.max_discard_sectors); - /** + /* * If splitting a request, and the next starting sector would be * misaligned, stop the discard at the previous aligned sector. */ -- 2.7.4