linux-toradex.git/include/uapi/linux/io_uring.h, branch v5.12-rc6

io_uring: flag new native workers with IORING_FEAT_NATIVE_WORKERS

2021-02-24T03:32:11+00:00

A few reasons to do this:

- The naming of the manager and worker have changed. That's a user visible
  change, so makes sense to flag it.

- Opening certain files that use ->signal (like /proc/self or /dev/tty)
  now works, and the flag tells the application upfront that this is the
  case.

- Related to the above, using signalfd will now work as well.

Signed-off-by: Jens Axboe

io_uring: Add skip option for __io_sqe_files_update

2021-02-01T17:02:43+00:00

This patch adds support for skipping a file descriptor when using
IORING_REGISTER_FILES_UPDATE.  __io_sqe_files_update will skip fds set
to IORING_REGISTER_FILES_SKIP. IORING_REGISTER_FILES_SKIP is inturn
added as a #define in io_uring.h

Signed-off-by: noah 
Signed-off-by: Jens Axboe

io_uring: rename file related variables to rsrc

2021-02-01T17:02:41+00:00

This is a prep rename patch for subsequent patches to generalize file
registration.

[io_uring_rsrc_update:: rename fds -> data]

Reviewed-by: Pavel Begunkov 
Signed-off-by: Bijan Mottahedeh 
[leave io_uring_files_update as struct]
Signed-off-by: Pavel Begunkov 
Signed-off-by: Jens Axboe

io_uring: add timeout update

2020-12-09T19:04:01+00:00

Support timeout updates through IORING_OP_TIMEOUT_REMOVE with passed in
IORING_TIMEOUT_UPDATE. Updates doesn't support offset timeout mode.
Oirignal timeout.off will be ignored as well.

Signed-off-by: Pavel Begunkov 
[axboe: remove now unused 'ret' variable]
Signed-off-by: Jens Axboe

io_uring: add timeout support for io_uring_enter()

2020-12-09T19:03:59+00:00

Now users who want to get woken when waiting for events should submit a
timeout command first. It is not safe for applications that split SQ and
CQ handling between two threads, such as mysql. Users should synchronize
the two threads explicitly to protect SQ and that will impact the
performance.

This patch adds support for timeout to existing io_uring_enter(). To
avoid overloading arguments, it introduces a new parameter structure
which contains sigmask and timeout.

I have tested the workloads with one thread submiting nop requests
while the other reaping the cqe with timeout. It shows 1.8~2x faster
when the iodepth is 16.

Signed-off-by: Jiufei Xue 
Signed-off-by: Hao Xu 
[axboe: various cleanups/fixes, and name change to SIG_IS_DATA]
Signed-off-by: Jens Axboe

io_uring: add support for IORING_OP_UNLINKAT

2020-12-09T19:03:59+00:00

IORING_OP_UNLINKAT behaves like unlinkat(2) and takes the same flags
and arguments.

Signed-off-by: Jens Axboe

io_uring: add support for IORING_OP_RENAMEAT

2020-12-09T19:03:59+00:00

IORING_OP_RENAMEAT behaves like renameat2(), and takes the same flags
etc.

Signed-off-by: Jens Axboe

io_uring: allow non-fixed files with SQPOLL

2020-12-09T19:03:54+00:00

The restriction of needing fixed files for SQPOLL is problematic, and
prevents/inhibits several valid uses cases. With the referenced
files_struct that we have now, it's trivially supportable.

Treat ->files like we do the mm for the SQPOLL thread - grab a reference
to it (and assign it), and drop it when we're done.

This feature is exposed as IORING_FEAT_SQPOLL_NONFIXED.

Signed-off-by: Jens Axboe

io_uring: add support for shutdown(2)

2020-11-23T16:15:15+00:00

This adds support for the shutdown(2) system call, which is useful for
dealing with sockets.

shutdown(2) may block, so we have to punt it to async context.

Suggested-by: Norman Maurer 
Signed-off-by: Jens Axboe

io_uring: provide IORING_ENTER_SQ_WAIT for SQPOLL SQ ring waits

2020-10-01T02:32:33+00:00

When using SQPOLL, applications can run into the issue of running out of
SQ ring entries because the thread hasn't consumed them yet. The only
option for dealing with that is checking later, or busy checking for the
condition.

Provide IORING_ENTER_SQ_WAIT if applications want to wait on this
condition.

Signed-off-by: Jens Axboe