iomap: use __bio_add_page in iomap_dio_zero

We don't need any merging logic, and this also replaces a BUG_ON with a
WARN_ON_ONCE inside __bio_add_page for the impossible overflow condition.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

diff --git a/fs/iomap.c b/fs/iomap.c
index df2652b..85901b4 100644 (file)
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -845,8 +845,7 @@ iomap_dio_zero(struct iomap_dio *dio, struct iomap *iomap, loff_t pos,
        bio->bi_end_io = iomap_dio_bio_end_io;
 
        get_page(page);
-       if (bio_add_page(bio, page, len, 0) != len)
-               BUG();
+       __bio_add_page(bio, page, len, 0);
        bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_SYNC | REQ_IDLE);
 
        atomic_inc(&dio->ref);