From: Darrick J. Wong <darrick.wong@oracle.com>
Date: Tue, 25 Oct 2016 01:46:51 +0000 (+1100)
Subject: xfs: don't mix reflink and DAX mode for now
X-Git-Tag: v4.9.0-rc1~77
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=378ed4e785ae4ed5a94c923c25bacd340247c1ca;p=thirdparty%2Fxfsprogs-dev.git

xfs: don't mix reflink and DAX mode for now

Source kernel commit: 4f435ebe7d0422af61cdcddbbcc659888645a1e1

Since we don't have a strategy for handling both DAX and reflink,
for now we'll just prohibit both being set at the same time.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/libxfs/xfs_inode_buf.c b/libxfs/xfs_inode_buf.c
index ed34eceba..4796a592b 100644
--- a/libxfs/xfs_inode_buf.c
+++ b/libxfs/xfs_inode_buf.c
@@ -416,6 +416,10 @@ xfs_dinode_verify(
 	if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME))
 		return false;
 
+	/* don't let reflink and dax mix */
+	if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags2 & XFS_DIFLAG2_DAX))
+		return false;
+
 	return true;
 }