io_uring: put provided buffer meta data under memcg accounting
For each provided buffer, we allocate a struct io_buffer to hold the data associated with it. As a large number of buffers can be provided, account that data with memcg. Fixes: ddf0322d ("io_uring: add IORING_OP_PROVIDE_BUFFERS") Signed-off-by: Jens Axboe <axboe@kernel.dk>
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