diff mbox series

[5.4,5/6] xfs: preserve inode versioning across remounts

Message ID 20221111041025.87704-6-chandan.babu@oracle.com (mailing list archive)
State New, archived
Headers show
Series xfs stable candidate patches for 5.4.y (from v5.9) | expand

Commit Message

Chandan Babu R Nov. 11, 2022, 4:10 a.m. UTC 
From: Eric Sandeen <sandeen@redhat.com>

commit 4750a171c3290f9bbebca16c6372db723a4cfa3b upstream.

[ For 5.4.y, SB_I_VERSION should be set in xfs_fs_remount() ]

The MS_I_VERSION mount flag is exposed via the VFS, as documented
in the mount manpages etc; see the iversion and noiversion mount
options in mount(8).

As a result, mount -o remount looks for this option in /proc/mounts
and will only send the I_VERSION flag back in during remount it it
is present.  Since it's not there, a remount will /remove/ the
I_VERSION flag at the vfs level, and iversion functionality is lost.

xfs v5 superblocks intend to always have i_version enabled; it is
set as a default at mount time, but is lost during remount for the
reasons above.

The generic fix would be to expose this documented option in
/proc/mounts, but since that was rejected, fix it up again in the
xfs remount path instead, so that at least xfs won't suffer from
this misbehavior.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
---
 fs/xfs/xfs_super.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 2429acbfb132..f1407900aeef 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1228,6 +1228,10 @@  xfs_fs_remount(
 	char			*p;
 	int			error;
 
+	/* version 5 superblocks always support version counters. */
+	if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
+		*flags |= SB_I_VERSION;
+
 	/* First, check for complete junk; i.e. invalid options */
 	error = xfs_test_remount_options(sb, options);
 	if (error)