4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

[ 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.w...@oracle.com>
Reviewed-by: Omar Sandoval <osan...@fb.com>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Sasha Levin <sas...@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 46fe9248410d..d8b89c58af3d 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -63,10 +63,16 @@ 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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