1 files changed, 14 insertions, 0 deletions
diff --git a/block/blk.h b/block/blk.h
index 9dcf51c94096..49e2928a1632 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -265,6 +265,20 @@ static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
 }
 
 /*
+ * The max bio size which is aligned to q->limits.discard_granularity. This
+ * is a hint to split large discard bio in generic block layer, then if device
+ * driver needs to split the discard bio into smaller ones, their bi_size can
+ * be very probably and easily aligned to discard_granularity of the device's
+ * queue.
+ */
+static inline unsigned int bio_aligned_discard_max_sectors(
+					struct request_queue *q)
+{
+	return round_down(UINT_MAX, q->limits.discard_granularity) >>
+			SECTOR_SHIFT;
+}
+
+/*
  * Internal io_context interface
  */
 void get_io_context(struct io_context *ioc);