linux-ext4 - [PATCH 2/5] fs/xfs: Isolate the physical DAX flag from effective

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Date:   Sun, 20 Oct 2019 08:59:32 -0700
From:   ira.weiny@...el.com
To:     linux-kernel@...r.kernel.org
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Christoph Hellwig <hch@....de>,
        "Theodore Y. Ts'o" <tytso@....edu>, Jan Kara <jack@...e.cz>,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH 2/5] fs/xfs: Isolate the physical DAX flag from effective

From: Ira Weiny <ira.weiny@...el.com>

xfs_ioctl_setattr_dax_invalidate() currently checks if the DAX flag is
changing as a quick check.

But the implementation mixes the physical (XFS_DIFLAG2_DAX) and
effective (S_DAX) DAX flags.

Remove the use of the effective flag when determining if a change of the
physical flag is required.

Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 fs/xfs/xfs_ioctl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index d58f0d6a699e..0ea326290cca 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1319,9 +1319,11 @@ xfs_ioctl_setattr_dax_invalidate(
 	}
 
 	/* If the DAX state is not changing, we have nothing to do here. */
-	if ((fa->fsx_xflags & FS_XFLAG_DAX) && IS_DAX(inode))
+	if ((fa->fsx_xflags & FS_XFLAG_DAX) &&
+	    (ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
 		return 0;
-	if (!(fa->fsx_xflags & FS_XFLAG_DAX) && !IS_DAX(inode))
+	if (!(fa->fsx_xflags & FS_XFLAG_DAX) &&
+	    !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
 		return 0;
 
 	if (S_ISDIR(inode->i_mode))
-- 
2.20.1