Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 01/36] block: break discard submissions into the user defined size | Date | Fri, 28 Dec 2018 12:52:17 +0100 |
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4.14-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit af097f5d199e2aa3ab3ef777f0716e487b8f7b08 ]
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'.
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org> --- block/blk-lib.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/block/blk-lib.c b/block/blk-lib.c index 2bc544ce3d2e..53a45663e688 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -59,10 +59,16 @@ 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, + * ensuring that bi_size doesn't overflow + */ + req_sects = min_t(sector_t, nr_sects, + q->limits.max_discard_sectors); + if (req_sects > UINT_MAX >> 9) + req_sects = UINT_MAX >> 9; - /** + /* * If splitting a request, and the next starting sector would be * misaligned, stop the discard at the previous aligned sector. */ -- 2.19.1
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