diff options
| 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 /include/linux/io_uring/cmd.h | |
| parent | 6d0f8dcb3a634bbee46fcb028c5984c463f47812 (diff) | |
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 'include/linux/io_uring/cmd.h')
| -rw-r--r-- | include/linux/io_uring/cmd.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h index 447fbfd32215..86ceb3383e49 100644 --- a/include/linux/io_uring/cmd.h +++ b/include/linux/io_uring/cmd.h @@ -48,6 +48,9 @@ void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd, void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, unsigned int issue_flags); +/* Execute the request from a blocking context */ +void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd); + #else static inline int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, struct iov_iter *iter, void *ioucmd) @@ -67,6 +70,9 @@ static inline void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, unsigned int issue_flags) { } +static inline void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd) +{ +} #endif /* |