block: implement block_read/block_write functions

Some drivers use blk->ops->read/write. This bypasses the caching block
layer and was never intended like this. The upper API to the block layer
is the cdev layer. This patch adds block_read and block_write functions
and uses them where appropriate.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 22 insertions, 0 deletions

diff --git a/common/block.c b/common/block.c
index 2cf85ae987..ad07f8b2e2 100644
--- a/common/block.c
+++ b/common/block.c
@@ -387,3 +387,25 @@ int blockdevice_unregister(struct block_device *blk)
 
 	return 0;
 }
+
+int block_read(struct block_device *blk, void *buf, int block, int num_blocks)
+{
+	int ret;
+
+	ret = cdev_read(&blk->cdev, buf,
+			num_blocks << blk->blockbits,
+			(loff_t)block << blk->blockbits, 0);
+
+	return ret < 0 ? ret : 0;
+}
+
+int block_write(struct block_device *blk, void *buf, int block, int num_blocks)
+{
+	int ret;
+
+	ret = cdev_write(&blk->cdev, buf,
+			num_blocks << blk->blockbits,
+			(loff_t)block << blk->blockbits, 0);
+
+	return ret < 0 ? ret : 0;
+}