xfs: remove attr fork handling in xfs_bmap_finish_one

	struct xfs_bmbt_irec		bmap;

	int				nimaps = 1;

	xfs_fsblock_t			firstfsb;

	int				flags = XFS_BMAPI_REMAP;

	int				done;

	int				error = 0;

			XFS_FSB_TO_AGBNO(tp->t_mountp, startblock),

			ip->i_ino, whichfork, startoff, blockcount, state);

	if (whichfork != XFS_DATA_FORK && whichfork != XFS_ATTR_FORK)

	if (WARN_ON_ONCE(whichfork != XFS_DATA_FORK))

		return -EFSCORRUPTED;

	if (whichfork == XFS_ATTR_FORK)

		flags |= XFS_BMAPI_ATTRFORK;

	if (XFS_TEST_ERROR(false, tp->t_mountp,

			XFS_ERRTAG_BMAP_FINISH_ONE,

	case XFS_BMAP_MAP:

		firstfsb = bmap.br_startblock;

		error = xfs_bmapi_write(tp, ip, bmap.br_startoff,

					bmap.br_blockcount, flags, &firstfsb,

					bmap.br_blockcount, XFS_BMAPI_REMAP, &firstfsb,

					bmap.br_blockcount, &bmap, &nimaps,

					dfops);

		break;

	case XFS_BMAP_UNMAP:

		error = xfs_bunmapi(tp, ip, bmap.br_startoff,

				bmap.br_blockcount, flags, 1, &firstfsb,

				bmap.br_blockcount, XFS_BMAPI_REMAP, 1, &firstfsb,

				dfops, &done);

		ASSERT(done);

		break;