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| author | Pavel Begunkov <asml.silence@gmail.com> | 2024-09-11 17:34:37 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2024-09-11 10:44:10 -0600 |
| commit | 6746ee4c3a189f8b60694f01e7e29bc5ff7972e0 (patch) | |
| tree | 6ab9e275c7681d7a8c2d1c9849fc053376a33527 /io_uring/io_uring.h | |
| parent | 6d0f8dcb3a634bbee46fcb028c5984c463f47812 (diff) | |
| download | lwn-6746ee4c3a189f8b60694f01e7e29bc5ff7972e0.tar.gz lwn-6746ee4c3a189f8b60694f01e7e29bc5ff7972e0.zip | |
io_uring/cmd: expose iowq to cmds
When an io_uring request needs blocking context we offload it to the
io_uring's thread pool called io-wq. We can get there off ->uring_cmd
by returning -EAGAIN, but there is no straightforward way of doing that
from an asynchronous callback. Add a helper that would transfer a
command to a blocking context.
Note, we do an extra hop via task_work before io_queue_iowq(), that's a
limitation of io_uring infra we have that can likely be lifted later
if that would ever become a problem.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/f735f807d7c8ba50c9452c69dfe5d3e9e535037b.1726072086.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/io_uring.h')
| -rw-r--r-- | io_uring/io_uring.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h index 65078e641390..9d70b2cf7b1e 100644 --- a/io_uring/io_uring.h +++ b/io_uring/io_uring.h @@ -94,6 +94,7 @@ int io_uring_alloc_task_context(struct task_struct *task, int io_ring_add_registered_file(struct io_uring_task *tctx, struct file *file, int start, int end); +void io_req_queue_iowq(struct io_kiocb *req); int io_poll_issue(struct io_kiocb *req, struct io_tw_state *ts); int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr); |