btrfs: use BLK_STS defines where needed

At few places we could use BLK_STS_OK and BLK_STS_NOSUPP.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Satoru Taekeuchi <satoru.takeuchi@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ dropped first hunk btrfs_endio_direct_read ]
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 280384b..8bdd3dc 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -255,7 +255,8 @@
 					 cb->start,
 					 cb->start + cb->len - 1,
 					 NULL,
-					 bio->bi_status ? 0 : 1);
+					 bio->bi_status ?
+					 BLK_STS_OK : BLK_STS_NOTSUPP);
 	cb->compressed_pages[0]->mapping = NULL;
 
 	end_compressed_writeback(inode, cb);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index a11f87f..f2787ca 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8485,7 +8485,7 @@
 	if (dip->errors) {
 		bio_io_error(dip->orig_bio);
 	} else {
-		dip->dio_bio->bi_status = 0;
+		dip->dio_bio->bi_status = BLK_STS_OK;
 		bio_endio(dip->orig_bio);
 	}
 out:
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 4931b2d..56ed01f 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6029,7 +6029,7 @@
 			 * this bio is actually up to date, we didn't
 			 * go over the max number of errors
 			 */
-			bio->bi_status = 0;
+			bio->bi_status = BLK_STS_OK;
 		}
 
 		btrfs_end_bbio(bbio, bio);