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

Message ID 20190417012715.8287-2-ruansy.fnst@cn.fujitsu.com (mailing list archive)
State New, archived
Headers show
Series xfs: add handle for reflink in dax | expand

Commit Message

Ruan Shiyang April 17, 2019, 1:27 a.m. UTC
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@cn.fujitsu.com>
---
 include/linux/iomap.h | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

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 */