Linux kernel stable tree (mirror) https://git.radix-linux.su/kernel/linux.git/atom?h=v6.12.80 2023-12-12T14:42:57+00:00 2023-12-12T14:42:57+00:00 Jens Axboe axboe@kernel.dk 2023-12-08T03:06:02+00:00 urn:sha1:dc18b89ab113e9c6c7a529316ddf7029fb55132d 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> 2022-07-25T00:39:16+00:00 Jens Axboe axboe@kernel.dk 2022-06-13T10:42:56+00:00 urn:sha1:f110ed8498afa6ff8e9a8c08fb26880e02117616 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> 2022-07-25T00:39:11+00:00 Jens Axboe axboe@kernel.dk 2022-05-25T03:54:43+00:00 urn:sha1:cd40cae29ef815de6f7e72207b677c78f43f4688 Signed-off-by: Jens Axboe <axboe@kernel.dk>