1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
3 #include <linux/errno.h>
4 #include <linux/file.h>
5 #include <linux/io_uring.h>
6 #include <linux/security.h>
8 #include <uapi/linux/io_uring.h>
11 #include "uring_cmd.h"
13 static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
15 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
17 ioucmd->task_work_cb(ioucmd);
20 void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
21 void (*task_work_cb)(struct io_uring_cmd *))
23 struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
25 ioucmd->task_work_cb = task_work_cb;
26 req->io_task_work.func = io_uring_cmd_work;
27 io_req_task_work_add(req);
29 EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task);
31 static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
32 u64 extra1, u64 extra2)
36 req->flags |= REQ_F_CQE32_INIT;
40 * Called by consumers of io_uring_cmd, if they originally returned
41 * -EIOCBQUEUED upon receiving the command.
43 void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
45 struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
50 io_req_set_res(req, ret, 0);
51 if (req->ctx->flags & IORING_SETUP_CQE32)
52 io_req_set_cqe32_extra(req, res2, 0);
53 __io_req_complete(req, 0);
55 EXPORT_SYMBOL_GPL(io_uring_cmd_done);
57 int io_uring_cmd_prep_async(struct io_kiocb *req)
59 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
62 BUILD_BUG_ON(uring_cmd_pdu_size(0) != 16);
63 BUILD_BUG_ON(uring_cmd_pdu_size(1) != 80);
65 cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128);
67 memcpy(req->async_data, ioucmd->cmd, cmd_size);
71 int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
73 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
75 if (sqe->rw_flags || sqe->__pad1)
77 ioucmd->cmd = sqe->cmd;
78 ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
82 int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
84 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
85 struct io_ring_ctx *ctx = req->ctx;
86 struct file *file = req->file;
89 if (!req->file->f_op->uring_cmd)
92 ret = security_uring_cmd(ioucmd);
96 if (ctx->flags & IORING_SETUP_SQE128)
97 issue_flags |= IO_URING_F_SQE128;
98 if (ctx->flags & IORING_SETUP_CQE32)
99 issue_flags |= IO_URING_F_CQE32;
100 if (ctx->flags & IORING_SETUP_IOPOLL)
101 issue_flags |= IO_URING_F_IOPOLL;
103 if (req_has_async_data(req))
104 ioucmd->cmd = req->async_data;
106 ret = file->f_op->uring_cmd(ioucmd, issue_flags);
107 if (ret == -EAGAIN) {
108 if (!req_has_async_data(req)) {
109 if (io_alloc_async_data(req))
111 io_uring_cmd_prep_async(req);
116 if (ret != -EIOCBQUEUED) {
119 io_req_set_res(req, ret, 0);
123 return IOU_ISSUE_SKIP_COMPLETE;