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io_uring: add iopoll infrastructure for io_uring_cmd

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Put this up in the same way as iopoll is done for regular read/write IO.
Make place for storing a cookie into struct io_uring_cmd on submission.
Perform the completion using the ->uring_cmd_iopoll handler.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
Link: https://lore.kernel.org/r/20220823161443.49436-3-joshi.k@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kanchan Joshi
2022-08-23 21:44:41 +05:30
committed by Jens Axboe
parent de27e18e86
commit 5756a3a7e7
5 changed files with 29 additions and 5 deletions
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11
io_uring/uring_cmd.c
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@@ -50,7 +50,11 @@ void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
io_req_set_res(req, ret, 0);
if (req->ctx->flags & IORING_SETUP_CQE32)
io_req_set_cqe32_extra(req, res2, 0);
__io_req_complete(req, 0);
if (req->ctx->flags & IORING_SETUP_IOPOLL)
/* order with io_iopoll_req_issued() checking ->iopoll_complete */
smp_store_release(&req->iopoll_completed, 1);
else
__io_req_complete(req, 0);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_done);
@@ -97,8 +101,11 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
issue_flags |= IO_URING_F_SQE128;
if (ctx->flags & IORING_SETUP_CQE32)
issue_flags |= IO_URING_F_CQE32;
if (ctx->flags & IORING_SETUP_IOPOLL)
if (ctx->flags & IORING_SETUP_IOPOLL) {
issue_flags |= IO_URING_F_IOPOLL;
req->iopoll_completed = 0;
WRITE_ONCE(ioucmd->cookie, NULL);
}
if (req_has_async_data(req))
ioucmd->cmd = req->async_data;