Kernel space fcntl() equivalent

Question

I’ve been learning a bit more about LKMs, and I was trying to use fcntl() in this space to get flags associated with a file descriptor. But since this is in kernel space, I assumed we could use sys_fcntl(). When I try this, it says that symbol is undefined.

Is this symbol not exported, or is there another call I should use to get flags (O_CREAT, O_TMPFILE, etc.)? I only have the file descriptor, which is why I thought fcntl(fd, F_GETFL).

Thanks for any help!