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authorJens Axboe <axboe@kernel.dk>2018-05-08 15:09:41 -0600
committerJens Axboe <axboe@kernel.dk>2018-05-08 15:10:44 -0600
commitaf097f5d199e2aa3ab3ef777f0716e487b8f7b08 (patch)
treec93cd4dcadcadf206d7889a3d071450900137b0f
parentd3349b6b3c373ac1fbfb040b810fcee5e2adc7e0 (diff)
downloadlinux-af097f5d199e2aa3ab3ef777f0716e487b8f7b08.tar.bz2
block: break discard submissions into the user defined size
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>
-rw-r--r--block/blk-lib.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c
index a676084d4740..8faa70f26fcd 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -62,10 +62,16 @@ 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.
*/