io_uring: handle multiple personalities in link chains
If we have a chain of requests and they don't all use the same credentials, then the head of the chain will be issued with the credentails of the tail of the chain. Ensure __io_queue_sqe() overrides the credentials, if they are different. Once we do that, we can clean up the creds handling as well, by only having io_submit_sqe() do the lookup of a personality. It doesn't need to assign it, since __io_queue_sqe() now always does the right thing. Fixes: 75c6a039 ("io_uring: support using a registered personality for commands") Reported-by: NPavel Begunkov <asml.silence@gmail.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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