From: Christoph Hellwig <hch@lst.de>
Date: Sun, 17 Sep 2017 21:06:27 +0000 (-0700)
Subject: xfs: disable per-inode DAX flag
X-Git-Tag: v4.13.3~8
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=0f5748b23567df4aabbd12b5ac59c6f5ce2ddb71;p=thirdparty%2Fkernel%2Fstable.git

xfs: disable per-inode DAX flag

commit 742d84290739ae908f1b61b7d17ea382c8c0073a upstream.

Currently flag switching can be used to easily crash the kernel.  Disable
the per-inode DAX flag until that is sorted out.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 9c0c7a920304e..06ca244c323ae 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1008,11 +1008,12 @@ xfs_diflags_to_linux(
 		inode->i_flags |= S_NOATIME;
 	else
 		inode->i_flags &= ~S_NOATIME;
+#if 0	/* disabled until the flag switching races are sorted out */
 	if (xflags & FS_XFLAG_DAX)
 		inode->i_flags |= S_DAX;
 	else
 		inode->i_flags &= ~S_DAX;
-
+#endif
 }
 
 static int