[PATCH 10/21] block: Add flush callback

[Sascha Hauer]

Some block devices need an explicit callback for flushing written
blocks. Add this callback.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 common/block.c  | 3 +++
 include/block.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/common/block.c b/common/block.c
index e522ee4..0edc861 100644
--- a/common/block.c
+++ b/common/block.c
@@ -55,6 +55,9 @@ static int writebuffer_flush(struct block_device *blk)
 		}
 	}
 
+	if (blk->ops->flush)
+		return blk->ops->flush(blk);
+
 	return 0;
 }
 
diff --git a/include/block.h b/include/block.h
index 872a4c1..9137767 100644
--- a/include/block.h
+++ b/include/block.h
@@ -9,6 +9,7 @@ struct block_device;
 struct block_device_ops {
 	int (*read)(struct block_device *, void *buf, int block, int num_blocks);
 	int (*write)(struct block_device *, const void *buf, int block, int num_blocks);
+	int (*flush)(struct block_device *);
 };
 
 struct chunk;
-- 
2.0.0