fuse_filehandle_get
err = fuse_filehandle_get(vp, fflag, fufhp, cred, pid);
err = fuse_filehandle_get(vp, FREAD | FWRITE, fufhp, cred, pid);
int fuse_filehandle_get(struct vnode *vp, int fflag,
error = fuse_filehandle_get(vp, FWRITE, &fufh, cred, pid);
if (fuse_filehandle_get(vp, FREAD, fufhp, cred, pid) == 0)
return fuse_filehandle_get(vp, FEXEC, fufhp, cred, pid);