xfs_flush_unmap_range
error = xfs_flush_unmap_range(ip, offset, len);
error = xfs_flush_unmap_range(ip, offset, XFS_ISIZE(ip));
int xfs_flush_unmap_range(struct xfs_inode *ip, xfs_off_t offset,
error = xfs_flush_unmap_range(ip2, fxr->file2_offset, fxr->length);
error = xfs_flush_unmap_range(ip1, fxr->file1_offset, fxr->length);
ret = xfs_flush_unmap_range(dest, XFS_ISIZE(dest), flen);
ret = xfs_flush_unmap_range(dest, pos_out, *len);