[PATCH v15 11/37] xfsprogs: Check for extent overflow when swapping extents

From: Chandan Babu R <redacted>

Source kernel commit: bcc561f21f115437a010307420fc43d91be91c66

Removing an initial range of source/donor file's extent and adding a new
extent (from donor/source file) in its place will cause extent count to
increase by 1.

Reviewed-by: Darrick J. Wong <redacted>
Reviewed-by: Allison Henderson <redacted>
Signed-off-by: Chandan Babu R <redacted>
Signed-off-by: Darrick J. Wong <redacted>
Signed-off-by: Allison Henderson <redacted>
---
 libxfs/xfs_inode_fork.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libxfs/xfs_inode_fork.h b/libxfs/xfs_inode_fork.h
index c8f279e..9e2137c 100644
--- a/libxfs/xfs_inode_fork.h
+++ b/libxfs/xfs_inode_fork.h

@@ -89,6 +89,13 @@ struct xfs_ifork {
 #define XFS_IEXT_REFLINK_END_COW_CNT	(2)
 
 /*
+ * Removing an initial range of source/donor file's extent and adding a new
+ * extent (from donor/source file) in its place will cause extent count to
+ * increase by 1.
+ */
+#define XFS_IEXT_SWAP_RMAP_CNT		(1)
+
+/*
  * Fork handling.
  */
 

-- 
2.7.4