ext4: Fix to read empty directory blocks correctly in 64k

[~andy/linux] / fs / bio.c

diff --git a/fs/bio.c b/fs/bio.c
index 13be075806b6ea072322b93a01e16998dee81024..062299acbccddc2d8f808d6cb85722cdd9ef6d09 100644 (file)
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -859,7 +859,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
        /*
         * success
         */
-       if (!write_to_vm) {
+       if (!write_to_vm && (!map_data || !map_data->null_mapped)) {
                ret = __bio_copy_iov(bio, bio->bi_io_vec, iov, iov_count, 0, 0);
                if (ret)
                        goto cleanup;