linux-kernel - [PATCH 4.19 020/361] block: make sure writesame bio is aligned with logical block size

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Date:   Sun, 11 Nov 2018 14:16:07 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mike Snitzer <snitzer@...hat.com>,
        Christoph Hellwig <hch@....de>, Xiao Ni <xni@...hat.com>,
        Mariusz Dabrowski <mariusz.dabrowski@...el.com>,
        Rui Salvaterra <rsalvaterra@...il.com>,
        Ming Lei <ming.lei@...hat.com>, Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 4.19 020/361] block: make sure writesame bio is aligned with logical block size

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

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

From: Ming Lei <ming.lei@...hat.com>

commit 34ffec60b27aa81d04e274e71e4c6ef740f75fc7 upstream.

Obviously the created writesame bio has to be aligned with logical block
size, and use bio_allowed_max_sectors() to retrieve this number.

Cc: stable@...r.kernel.org
Cc: Mike Snitzer <snitzer@...hat.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Xiao Ni <xni@...hat.com>
Cc: Mariusz Dabrowski <mariusz.dabrowski@...el.com>
Fixes: b49a0871be31a745b2ef ("block: remove split code in blkdev_issue_{discard,write_same}")
Tested-by: Rui Salvaterra <rsalvaterra@...il.com>
Signed-off-by: Ming Lei <ming.lei@...hat.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 block/blk-lib.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -161,7 +161,7 @@ static int __blkdev_issue_write_same(str
 		return -EOPNOTSUPP;
 
 	/* Ensure that max_write_same_sectors doesn't overflow bi_size */
-	max_write_same_sectors = UINT_MAX >> 9;
+	max_write_same_sectors = bio_allowed_max_sectors(q);
 
 	while (nr_sects) {
 		bio = next_bio(bio, 1, gfp_mask);