--- drivers/char/raw.c

+++ drivers/char/raw.c

@@ -247,6 +247,7 @@ static const struct file_operations raw_

.aio_read = generic_file_aio_read,

.write = do_sync_write,

.aio_write = blkdev_aio_write,

+ .fsync = block_fsync,

.open = raw_open,

.release= raw_release,

.ioctl = raw_ioctl,