kernel/git/stable/linux.git/io_uring/tctx.h, branch linux-7.2.y

io_uring: preserve task restrictions across exec

2026-07-30T20:40:22+00:00

Per-task restrictions apply to all rings created by a task. Once installed, they should not be dropped across exec. For a task that has used io_uring, the exec cancellation path calls __io_uring_free(). This frees both the task context and the per-task restriction, so a ring created after exec is unrestricted. Split task context cleanup into io_uring_free_tctx(), and use it from the exec cancellation path. Keep __io_uring_free() for final task cleanup, where both the context and restriction are released. Fixes: ed82f35b926b ("io_uring: allow registration of per-task restrictions") Cc: stable@vger.kernel.org # 7.1+ Signed-off-by: Kyumin Lee Link: https://patch.msgid.link/20260730192734.459247-1-fyonglkm@gmail.com Signed-off-by: Jens Axboe

io_uring/tctx: have io_uring_alloc_task_context() return tctx

2026-04-08T19:21:30+00:00

Instead of having io_uring_alloc_task_context() return an int and assign tsk->io_uring, just have it return the task context directly. This enables cleaner error handling in callers, which may have failure points post calling io_uring_alloc_task_context(). Signed-off-by: Jens Axboe

io_uring: simplify __io_uring_add_tctx_node

2022-10-07T18:25:30+00:00

Remove submitter parameter from __io_uring_add_tctx_node. It was only called from one place, and we can do that logic in that one place. Signed-off-by: Dylan Yudaken Fixes: 97bbdc06a444 ("io_uring: add IORING_SETUP_SINGLE_ISSUER") Signed-off-by: Jens Axboe

io_uring: export io_put_task()

2022-07-25T00:41:06+00:00

Make io_put_task() available to non-core parts of io_uring, we'll need it for notification infrastructure. Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/3686807d4c03b72e389947b0e8692d4d44334ef0.1657643355.git.asml.silence@gmail.com Signed-off-by: Jens Axboe

io_uring: lockless task list

2022-07-25T00:39:15+00:00

With networking use cases we see contention on the spinlock used to protect the task_list when multiple threads try and add completions at once. Instead we can use a lockless list, and assume that the first caller to add to the list is responsible for kicking off task work. Signed-off-by: Dylan Yudaken Link: https://lore.kernel.org/r/20220622134028.2013417-4-dylany@fb.com Signed-off-by: Jens Axboe

io_uring: remove priority tw list optimisation

2022-07-25T00:39:15+00:00

This optimisation has some built in assumptions that make it easy to introduce bugs. It also does not have clear wins that make it worth keeping. Signed-off-by: Dylan Yudaken Link: https://lore.kernel.org/r/20220622134028.2013417-2-dylany@fb.com Signed-off-by: Jens Axboe

io_uring: optimize io_uring_task layout

2022-07-25T00:39:15+00:00

task_work bits of io_uring_task are split into two cache lines causing extra cache bouncing, place them into a separate cache line. Also move the most used submission path fields closer together, so there are hot. Cc: stable@vger.kernel.org # 5.15+ Signed-off-by: Pavel Begunkov Signed-off-by: Jens Axboe

io_uring: add IORING_SETUP_SINGLE_ISSUER

2022-07-25T00:39:13+00:00

Add a new IORING_SETUP_SINGLE_ISSUER flag and the userspace visible part of it, i.e. put limitations of submitters. Also, don't allow it together with IOPOLL as we're not going to put it to good use. Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/4bcc41ee467fdf04c8aab8baf6ce3ba21858c3d4.1655371007.git.asml.silence@gmail.com Reviewed-by: Hao Xu Signed-off-by: Jens Axboe

io_uring: inline ->registered_rings

2022-07-25T00:39:13+00:00

There can be only 16 registered rings, no need to allocate an array for them separately but store it in tctx. Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/495f0b953c87994dd9e13de2134019054fa5830d.1655310733.git.asml.silence@gmail.com Signed-off-by: Jens Axboe

io_uring: move io_uring_task (tctx) helpers into its own file

2022-07-25T00:39:12+00:00

Signed-off-by: Jens Axboe