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io_uring/cmd: expose iowq to cmds

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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>
This commit is contained in:
Pavel Begunkov
2024-09-11 17:34:37 +01:00
committed by Jens Axboe
parent 6d0f8dcb3a
commit 6746ee4c3a
4 changed files with 25 additions and 0 deletions
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7
io_uring/uring_cmd.c
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@@ -277,6 +277,13 @@ int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
}
EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd)
{
struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
io_req_queue_iowq(req);
}
static inline int io_uring_cmd_getsockopt(struct socket *sock,
struct io_uring_cmd *cmd,
unsigned int issue_flags)