[PATCH 3/3] block: set REQ_PREFLUSH to the final bio from __blkdev_issue_zero_pages()

[Tom Yan <tom.ty89@xxxxxxxxx>]

Mimicking blkdev_issue_flush(). Seems like a right thing to do, as
they are a bunch of REQ_OP_WRITE.

Signed-off-by: Tom Yan <tom.ty89@xxxxxxxxx>
---
 block/blk-lib.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/blk-lib.c b/block/blk-lib.c
index 354dcab760c7..5579fdea893d 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -422,6 +422,8 @@ int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
 	} else if (!(flags & BLKDEV_ZERO_NOFALLBACK)) {
 		ret = __blkdev_issue_zero_pages(bdev, sector, nr_sects,
 						gfp_mask, &bio);
+		if (bio)
+			bio->bi_opf |= REQ_PREFLUSH;
 	} else {
 		/* No zeroing offload support */
 		ret = -EOPNOTSUPP;
-- 
2.29.2