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From DJBooth.net's interview with Royce da 5'9":

DJ Booth: A lot of my coworkers begged me to ask you who you are ghostwriting for these days.

Royce: I’m writing for Diddy right now, that’s pretty much it. I’m so involved with my project, the Slaughterhouse project, that I don’t have much free time to do side stuff. And I don’t even consider Diddy’s project side stuff, I consider that something that’s gotta get done. I’m officially a go-to guy for him; whenever he calls me, I stop what I’m doing, even if I’ve gotta work ‘em at the same time and just get ‘em done.

DJ Booth: When he sends you a check, does he include Sean John clothing and some cologne?

Royce: Yeah, he sends me everything – he sends me some Sean John clothing, Sean John cologne. He sent me a million-dollar check yesterday that I just got. I’ll probably buy you something for Christmas—what do you want?

As I have before, I must note that it's not ghostwriting if you're credited in the album booklet.