[RFC PATCH 1/4] fs/iomap: Introduce src_addr for COW in fsdax mode.

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When using reflink, coping the source blocks before writing data
into new allocated blocks is required.  In fsdax mode, we need a source
blocks' start address to handle the COW operation.

Signed-off-by: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxxxxx>
---
 include/linux/iomap.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 0fefb5455bda..3b3aec2311c5 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -61,6 +61,10 @@ struct iomap {
 	u16			flags;	/* flags for mapping */
 	struct block_device	*bdev;	/* block device for I/O */
 	struct dax_device	*dax_dev; /* dax_dev for dax operations */
+	u64			src_addr; /* disk offset of mapping, bytes,
+					   * the source blocks' start address
+					   * for cow in dax
+					   */
 	void			*inline_data;
 	void			*private; /* filesystem private */
 
-- 
2.17.0






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