xfs_exchmaps_reqfork
bmap_flags = xfs_bmapi_aflag(xfs_exchmaps_reqfork(req));
xfs_exchmaps_reqfork(req) == XFS_DATA_FORK) {
int whichfork = xfs_exchmaps_reqfork(req);
XFS_EXTENTADD_SPACE_RES(mp, xfs_exchmaps_reqfork(req));
int whichfork = xfs_exchmaps_reqfork(req);
int whichfork = xfs_exchmaps_reqfork(req);
int whichfork = xfs_exchmaps_reqfork(req);