block: Add missing flush_dcache_page() call

Since a bio can point to userspace pages (e.g. direct IO), this is
generally necessary.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/bio.c b/block/bio.c
index 858f56f3edcb62074ac28b22b75bfe6dbd4eb9f7..2112ad01b52cd5d8cd0c20dcebd14b864106efcc 100644 (file)
--- a/block/bio.c
+++ b/block/bio.c
@@ -994,6 +994,8 @@ void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter,
                kunmap_atomic(dst_p);
                kunmap_atomic(src_p);
 
+               flush_dcache_page(dst_bv.bv_page);
+
                bio_advance_iter(src, src_iter, bytes);
                bio_advance_iter(dst, dst_iter, bytes);
        }