Hi, We currently only support looking up and canceling requests based on the user_data of the original request. Sometimes it can be useful to instead key off the fd used in the original request, eg if a socket goes away. Patch 1 is just a cleanup spotted while doing this, 2 is a prep patch, patch 3 adds support for IORING_ASYNC_CANCEL_ALL, and finally patch 4 adds support for IORING_ASYNC_CANCEL_FD. If IORING_ASYNC_CANCEL_ALL is set, all requests matching the given criteria are canceled. Return value is number of requests canceled, and 0 if none were found, or any error encountered canceling requests. If IORING_ASYNC_CANCEL_FD is set, requests matching sqe->fd are canceled rather than matching on sqe->addr for user_data. v3: - Fixup issues with CANCEL_ALL - Combine two prep patches, and extent io_cancel_data propagation further. - Get rid of buggy task_work running, we don't need it anymore. -- Jens Axboe
