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99f15d8d JA |
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> | |
2a584012 | 6 | #include <linux/security.h> |
9cda70f6 | 7 | #include <linux/nospec.h> |
99f15d8d JA |
8 | |
9 | #include <uapi/linux/io_uring.h> | |
10 | ||
99f15d8d | 11 | #include "io_uring.h" |
a9216fac | 12 | #include "rsrc.h" |
99f15d8d JA |
13 | #include "uring_cmd.h" |
14 | ||
a282967c | 15 | static void io_uring_cmd_work(struct io_kiocb *req, struct io_tw_state *ts) |
99f15d8d | 16 | { |
f2ccb5ae | 17 | struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); |
a282967c | 18 | unsigned issue_flags = ts->locked ? 0 : IO_URING_F_UNLOCKED; |
99f15d8d | 19 | |
9d2789ac | 20 | ioucmd->task_work_cb(ioucmd, issue_flags); |
99f15d8d JA |
21 | } |
22 | ||
5f3139fc PB |
23 | void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd, |
24 | void (*task_work_cb)(struct io_uring_cmd *, unsigned), | |
25 | unsigned flags) | |
99f15d8d JA |
26 | { |
27 | struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); | |
28 | ||
29 | ioucmd->task_work_cb = task_work_cb; | |
30 | req->io_task_work.func = io_uring_cmd_work; | |
5f3139fc PB |
31 | __io_req_task_work_add(req, flags); |
32 | } | |
33 | EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task); | |
34 | ||
35 | void io_uring_cmd_do_in_task_lazy(struct io_uring_cmd *ioucmd, | |
36 | void (*task_work_cb)(struct io_uring_cmd *, unsigned)) | |
37 | { | |
38 | __io_uring_cmd_do_in_task(ioucmd, task_work_cb, IOU_F_TWQ_LAZY_WAKE); | |
99f15d8d | 39 | } |
5f3139fc | 40 | EXPORT_SYMBOL_GPL(io_uring_cmd_do_in_task_lazy); |
99f15d8d JA |
41 | |
42 | static inline void io_req_set_cqe32_extra(struct io_kiocb *req, | |
43 | u64 extra1, u64 extra2) | |
44 | { | |
45 | req->extra1 = extra1; | |
46 | req->extra2 = extra2; | |
47 | req->flags |= REQ_F_CQE32_INIT; | |
48 | } | |
49 | ||
50 | /* | |
51 | * Called by consumers of io_uring_cmd, if they originally returned | |
52 | * -EIOCBQUEUED upon receiving the command. | |
53 | */ | |
9d2789ac JA |
54 | void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2, |
55 | unsigned issue_flags) | |
99f15d8d JA |
56 | { |
57 | struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); | |
58 | ||
59 | if (ret < 0) | |
60 | req_set_fail(req); | |
61 | ||
ff2557b7 | 62 | io_req_set_res(req, ret, 0); |
99f15d8d JA |
63 | if (req->ctx->flags & IORING_SETUP_CQE32) |
64 | io_req_set_cqe32_extra(req, res2, 0); | |
27a67079 | 65 | if (req->ctx->flags & IORING_SETUP_IOPOLL) { |
5756a3a7 KJ |
66 | /* order with io_iopoll_req_issued() checking ->iopoll_complete */ |
67 | smp_store_release(&req->iopoll_completed, 1); | |
27a67079 JA |
68 | } else { |
69 | struct io_tw_state ts = { | |
70 | .locked = !(issue_flags & IO_URING_F_UNLOCKED), | |
71 | }; | |
72 | io_req_task_complete(req, &ts); | |
73 | } | |
99f15d8d JA |
74 | } |
75 | EXPORT_SYMBOL_GPL(io_uring_cmd_done); | |
76 | ||
77 | int io_uring_cmd_prep_async(struct io_kiocb *req) | |
78 | { | |
f2ccb5ae | 79 | struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); |
99f15d8d | 80 | |
fd9b8547 BL |
81 | memcpy(req->async_data, ioucmd->sqe, uring_sqe_size(req->ctx)); |
82 | ioucmd->sqe = req->async_data; | |
99f15d8d JA |
83 | return 0; |
84 | } | |
85 | ||
86 | int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
87 | { | |
f2ccb5ae | 88 | struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); |
99f15d8d | 89 | |
9cda70f6 | 90 | if (sqe->__pad1) |
99f15d8d | 91 | return -EINVAL; |
9cda70f6 AG |
92 | |
93 | ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags); | |
94 | if (ioucmd->flags & ~IORING_URING_CMD_FIXED) | |
95 | return -EINVAL; | |
96 | ||
97 | if (ioucmd->flags & IORING_URING_CMD_FIXED) { | |
98 | struct io_ring_ctx *ctx = req->ctx; | |
99 | u16 index; | |
100 | ||
101 | req->buf_index = READ_ONCE(sqe->buf_index); | |
102 | if (unlikely(req->buf_index >= ctx->nr_user_bufs)) | |
103 | return -EFAULT; | |
104 | index = array_index_nospec(req->buf_index, ctx->nr_user_bufs); | |
105 | req->imu = ctx->user_bufs[index]; | |
106 | io_req_set_rsrc_node(req, ctx, 0); | |
107 | } | |
fd9b8547 | 108 | ioucmd->sqe = sqe; |
99f15d8d JA |
109 | ioucmd->cmd_op = READ_ONCE(sqe->cmd_op); |
110 | return 0; | |
111 | } | |
112 | ||
113 | int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags) | |
114 | { | |
f2ccb5ae | 115 | struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); |
99f15d8d JA |
116 | struct io_ring_ctx *ctx = req->ctx; |
117 | struct file *file = req->file; | |
118 | int ret; | |
119 | ||
03b3d6be | 120 | if (!file->f_op->uring_cmd) |
99f15d8d JA |
121 | return -EOPNOTSUPP; |
122 | ||
2a584012 LC |
123 | ret = security_uring_cmd(ioucmd); |
124 | if (ret) | |
125 | return ret; | |
126 | ||
99f15d8d JA |
127 | if (ctx->flags & IORING_SETUP_SQE128) |
128 | issue_flags |= IO_URING_F_SQE128; | |
129 | if (ctx->flags & IORING_SETUP_CQE32) | |
130 | issue_flags |= IO_URING_F_CQE32; | |
5756a3a7 | 131 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
03b3d6be JA |
132 | if (!file->f_op->uring_cmd_iopoll) |
133 | return -EOPNOTSUPP; | |
99f15d8d | 134 | issue_flags |= IO_URING_F_IOPOLL; |
5756a3a7 KJ |
135 | req->iopoll_completed = 0; |
136 | WRITE_ONCE(ioucmd->cookie, NULL); | |
137 | } | |
99f15d8d | 138 | |
99f15d8d JA |
139 | ret = file->f_op->uring_cmd(ioucmd, issue_flags); |
140 | if (ret == -EAGAIN) { | |
141 | if (!req_has_async_data(req)) { | |
142 | if (io_alloc_async_data(req)) | |
143 | return -ENOMEM; | |
144 | io_uring_cmd_prep_async(req); | |
145 | } | |
146 | return -EAGAIN; | |
147 | } | |
148 | ||
149 | if (ret != -EIOCBQUEUED) { | |
3ed159c9 AG |
150 | if (ret < 0) |
151 | req_set_fail(req); | |
152 | io_req_set_res(req, ret, 0); | |
a9c3eda7 | 153 | return ret; |
99f15d8d JA |
154 | } |
155 | ||
156 | return IOU_ISSUE_SKIP_COMPLETE; | |
157 | } | |
a9216fac AG |
158 | |
159 | int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, | |
160 | struct iov_iter *iter, void *ioucmd) | |
161 | { | |
162 | struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); | |
163 | ||
164 | return io_import_fixed(rw, iter, req->imu, ubuf, len); | |
165 | } | |
166 | EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed); |