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Linux kernel source tree
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Normally MSG_RING requires both a source and a destination ring. But some users don't always have a ring avilable to send a message from, yet they still need to notify a target ring. Add support for using io_uring_register(2) without having a source ring, using a file descriptor of -1 for that. Internally those are called blind registration opcodes. Implement IORING_REGISTER_SEND_MSG_RING as a blind opcode, which simply takes an sqe that the application can put on the stack and use the normal liburing helpers to initialize it. Then the app can call: io_uring_register(-1, IORING_REGISTER_SEND_MSG_RING, &sqe, 1); and get the same behavior in terms of the target, where a CQE is posted with the details given in the sqe. For now this takes a single sqe pointer argument, and hence arg must be set to that, and nr_args must be 1. Could easily be extended to take an array of sqes, but for now let's keep it simple. Link: https://lore.kernel.org/r/20240924115932.116167-3-axboe@kernel.dk Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.