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xfs: disallow ro->rw remount on norecovery mount

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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 <sandeen@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Eric Sandeen 2015-04-13 11:25:41 +10:00 committed by Dave Chinner
parent 72c1a73993
commit bbe051c841
1 changed files with 6 additions and 0 deletions
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6
fs/xfs/xfs_super.c
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@ -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;
/*