Hi Damien,

quoted

+ */
+static bool bio_in_emulated_zone_area(struct dm_po2z_target *dmh,
+				      struct bio *bio, int *offset)

This function name reads like it is a block layer helper. It mat be less
confucing to keep using the dm_po2z_ prefix for it.

Good point. Even though it is a static function in the same file, it could
be confused for a block helper at the caller site.

quoted

+{
+	/*
+	 * Read operation on the emulated zone area (between zone capacity
+	 * and zone size) will fill the bio with zeroes. Any other operation

quoted

+
+	return DM_MAPIO_KILL;
+}

Do you see any more issues apart from the two you pointed out?