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io_uring: split out open/close operations Signed-off-by: Jens Axboe <axboe@kernel.dk> 2022-05-24 21:54:43 -06:00

io_uring: split out fixed file installation and removal Put it with the filetable code, which is where it belongs. While doing so, have the helpers take a ctx rather than an io_kiocb. It doesn't make sense to use a request, as it's not an operation on the request itself. It applies to the ring itself. Signed-off-by: Jens Axboe <axboe@kernel.dk> 2022-06-13 04:42:56 -06:00
io_uring: split out open/close operations Signed-off-by: Jens Axboe <axboe@kernel.dk> 2022-05-24 21:54:43 -06:00










io_uring/openclose: add support for IORING_OP_FIXED_FD_INSTALL io_uring can currently open/close regular files or fixed/direct descriptors. Or you can instantiate a fixed descriptor from a regular one, and then close the regular descriptor. But you currently can't turn a purely fixed/direct descriptor into a regular file descriptor. IORING_OP_FIXED_FD_INSTALL adds support for installing a direct descriptor into the normal file table, just like receiving a file descriptor or opening a new file would do. This is all nicely abstracted into receive_fd(), and hence adding support for this is truly trivial. Since direct descriptors are only usable within io_uring itself, it can be useful to turn them into real file descriptors if they ever need to be accessed via normal syscalls. This can either be a transitory thing, or just a permanent transition for a given direct descriptor. By default, new fds are installed with O_CLOEXEC set. The application can disable O_CLOEXEC by setting IORING_FIXED_FD_NO_CLOEXEC in the sqe->install_fd_flags member. Suggested-by: Christian Brauner <brauner@kernel.org> Reviewed-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> 2023-12-07 20:06:02 -07:00