[XFS] move root inode IRELE into xfs_unmountfs

The root inode is allocated in xfs_mountfs so it should be release in
xfs_unmountfs. For the unmount case that means we do it after the the
xfs_sync(mp, SYNC_WAIT | SYNC_CLOSE) in the forced shutdown case and the
dmapi unmount event. Note that both reference the rip variable which might
be freed by that time in case inode flushing has kicked in, so strictly
speaking this might count as a bug fix

SGI-PV: 981498

SGI-Modid: xfs-linux-melb:xfs-kern:31830a
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

fs/xfs/linux-2.6/xfs_super.c

@@ -1131,8 +1131,6 @@ xfs_fs_put_super(
 	error = xfs_unmount_flush(mp, 0);
 	WARN_ON(error);
 
-	IRELE(rip);
-
 	/*
 	 * If we're forcing a shutdown, typically because of a media error,
 	 * we want to make sure we invalidate dirty pages that belong to
@@ -1804,8 +1802,6 @@ xfs_fs_fill_super(
 	error = xfs_unmount_flush(mp, 0);
 	WARN_ON(error);
 
-	IRELE(mp->m_rootip);
-
 	xfs_unmountfs(mp);
 	goto out_free_fsname;
 }

fs/xfs/xfs_mount.c

@@ -1250,6 +1250,8 @@ xfs_unmountfs(xfs_mount_t *mp)
 	__uint64_t	resblks;
 	int		error = 0;
 
+	IRELE(mp->m_rootip);
+
 	/*
 	 * We can potentially deadlock here if we have an inode cluster
 	 * that has been freed has it's buffer still pinned in memory because