[PATCH v2] btrfs: not a disk error if the bio_add_page fails

[Anand Jain <anand.jain@oracle.com>]

bio_add_page() can fail for logical reasons as from the bio_add_page()
comments:- 'This will only fail if either
bio->bi_vcnt == bio->bi_max_vecs or it's a cloned bio.' Don't inc the
write error statistics for this. And set -EINVAL instead of -EIO.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
v1->v2: Add missing bio_put(). Thanks Filipe.

 fs/btrfs/scrub.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index ecfe3118d9dd..57ac39a3f046 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -4617,15 +4617,16 @@ static int write_page_nocow(struct scrub_ctx *sctx,
 	bio->bi_opf = REQ_OP_WRITE | REQ_SYNC;
 	ret = bio_add_page(bio, page, PAGE_SIZE, 0);
 	if (ret != PAGE_SIZE) {
-leave_with_eio:
+		bio_put(bio);
+		return -EINVAL;
+	}
+
+	if (btrfsic_submit_bio_wait(bio)) {
 		bio_put(bio);
 		btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
 		return -EIO;
 	}
 
-	if (btrfsic_submit_bio_wait(bio))
-		goto leave_with_eio;
-
 	bio_put(bio);
 	return 0;
 }
-- 
2.15.0