From bbe051c841d522bf2aaa1d362b57fe47457187bf Mon Sep 17 00:00:00 2001 From: Eric Sandeen Date: Mon, 13 Apr 2015 11:25:41 +1000 Subject: [PATCH] xfs: disallow ro->rw remount on norecovery mount There's a bit of a loophole in norecovery mount handling right now: an initial mount must be readonly, but nothing prevents a mount -o remount,rw from producing a writable, unrecovered xfs filesystem. It might be possible to try to perform a log recovery when this is requested, but I'm not sure it's worth the effort. For now, simply disallow this sort of transition. Signed-off-by: Eric Sandeen Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/xfs_super.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 58453e3..0271863 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1237,6 +1237,12 @@ xfs_fs_remount( /* ro -> rw */ if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) { + if (mp->m_flags & XFS_MOUNT_NORECOVERY) { + xfs_warn(mp, + "ro->rw transition prohibited on norecovery mount"); + return -EINVAL; + } + mp->m_flags &= ~XFS_MOUNT_RDONLY; /* -- 2.7.4