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io_uring commands provide an ioctl style interface for files to implement file specific operations. io_uring provides many features and advanced api to commands, and it's getting hard to test as it requires specific files/devices. Add basic infrastucture for creating special mock files that will be implementing the cmd api and using various io_uring features we want to test. It'll also be useful to test some more obscure read/write/polling edge cases in the future. Suggested-by: chase xd <sl1589472800@gmail.com> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/93f21b0af58c1367a2b22635d5a7d694ad0272fc.1750599274.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>