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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
7#include <uapi/linux/io_uring.h>
8
9#include "io_uring.h"
10#include "uring_cmd.h"
11
12static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
13{
14 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
15
16 ioucmd->task_work_cb(ioucmd);
17}
18
19void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
20 void (*task_work_cb)(struct io_uring_cmd *))
21{
22 struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
23
24 ioucmd->task_work_cb = task_work_cb;
25 req->io_task_work.func = io_uring_cmd_work;
26 io_req_task_work_add(req);
27}
28EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task);
29
30static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
31 u64 extra1, u64 extra2)
32{
33 req->extra1 = extra1;
34 req->extra2 = extra2;
35 req->flags |= REQ_F_CQE32_INIT;
36}
37
38/*
39 * Called by consumers of io_uring_cmd, if they originally returned
40 * -EIOCBQUEUED upon receiving the command.
41 */
42void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
43{
44 struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
45
46 if (ret < 0)
47 req_set_fail(req);
48
49 io_req_set_res(req, ret, 0);
50 if (req->ctx->flags & IORING_SETUP_CQE32)
51 io_req_set_cqe32_extra(req, res2, 0);
52 __io_req_complete(req, 0);
53}
54EXPORT_SYMBOL_GPL(io_uring_cmd_done);
55
56int io_uring_cmd_prep_async(struct io_kiocb *req)
57{
58 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
59 size_t cmd_size;
60
61 BUILD_BUG_ON(uring_cmd_pdu_size(0) != 16);
62 BUILD_BUG_ON(uring_cmd_pdu_size(1) != 80);
63
64 cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128);
65
66 memcpy(req->async_data, ioucmd->cmd, cmd_size);
67 return 0;
68}
69
70int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
71{
72 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
73
74 if (sqe->rw_flags || sqe->__pad1)
75 return -EINVAL;
76 ioucmd->cmd = sqe->cmd;
77 ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
78 return 0;
79}
80
81int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
82{
83 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
84 struct io_ring_ctx *ctx = req->ctx;
85 struct file *file = req->file;
86 int ret;
87
88 if (!req->file->f_op->uring_cmd)
89 return -EOPNOTSUPP;
90
91 if (ctx->flags & IORING_SETUP_SQE128)
92 issue_flags |= IO_URING_F_SQE128;
93 if (ctx->flags & IORING_SETUP_CQE32)
94 issue_flags |= IO_URING_F_CQE32;
95 if (ctx->flags & IORING_SETUP_IOPOLL)
96 issue_flags |= IO_URING_F_IOPOLL;
97
98 if (req_has_async_data(req))
99 ioucmd->cmd = req->async_data;
100
101 ret = file->f_op->uring_cmd(ioucmd, issue_flags);
102 if (ret == -EAGAIN) {
103 if (!req_has_async_data(req)) {
104 if (io_alloc_async_data(req))
105 return -ENOMEM;
106 io_uring_cmd_prep_async(req);
107 }
108 return -EAGAIN;
109 }
110
111 if (ret != -EIOCBQUEUED) {
112 if (ret < 0)
113 req_set_fail(req);
114 io_req_set_res(req, ret, 0);
115 return IOU_OK;
116 }
117
118 return IOU_ISSUE_SKIP_COMPLETE;
119}