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Subject[PATCH 4.4 71/88] block: break discard submissions into the user defined size
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Jens Axboe <axboe@kernel.dk>

commit af097f5d199e2aa3ab3ef777f0716e487b8f7b08 upstream.

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: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
block/blk-lib.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -81,8 +81,14 @@ int blkdev_issue_discard(struct block_de
break;
}

- /* 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

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