[PATCH 18/19] btrfs: use bdev_rw_virt in scrub_one_super

[Christoph Hellwig <hch@lst.de>]

Replace the code building a bio from a kernel direct map address and
submitting it synchronously with the bdev_rw_virt helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: David Sterba <dsterba@suse.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
---
 fs/btrfs/scrub.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 2c5edcee9450..7bdb2bc0a212 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -2770,17 +2770,11 @@ static int scrub_one_super(struct scrub_ctx *sctx, struct btrfs_device *dev,
 			   struct page *page, u64 physical, u64 generation)
 {
 	struct btrfs_fs_info *fs_info = sctx->fs_info;
-	struct bio_vec bvec;
-	struct bio bio;
 	struct btrfs_super_block *sb = page_address(page);
 	int ret;
 
-	bio_init(&bio, dev->bdev, &bvec, 1, REQ_OP_READ);
-	bio.bi_iter.bi_sector = physical >> SECTOR_SHIFT;
-	__bio_add_page(&bio, page, BTRFS_SUPER_INFO_SIZE, 0);
-	ret = submit_bio_wait(&bio);
-	bio_uninit(&bio);
-
+	ret = bdev_rw_virt(dev->bdev, physical >> SECTOR_SHIFT, sb,
+			BTRFS_SUPER_INFO_SIZE, REQ_OP_READ);
 	if (ret < 0)
 		return ret;
 	ret = btrfs_check_super_csum(fs_info, sb);
-- 
2.47.2