| 1 | |
| 2 | #include <linux/kernel.h>
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| 3 | #include <linux/errno.h>
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| 4 | #include <linux/fs.h>
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| 5 | #include <linux/file.h>
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| 6 | #include <linux/io_uring.h>
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| 7 |
|
| 8 | #include <uapi/linux/io_uring.h>
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| 9 |
|
| 10 | #include "io_uring.h"
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| 11 | #include "rsrc.h"
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| 12 | #include "nop.h"
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| 13 |
|
| 14 | struct io_nop {
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| 15 | struct file *file;
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| 16 | int result;
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| 17 | int fd;
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| 18 | unsigned int flags;
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| 19 | __u64 extra1;
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| 20 | __u64 extra2;
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| 21 | };
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| 22 |
|
| 23 | #define NOP_FLAGS (IORING_NOP_INJECT_RESULT | IORING_NOP_FIXED_FILE | \
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| 24 | IORING_NOP_FIXED_BUFFER | IORING_NOP_FILE | \
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| 25 | IORING_NOP_TW | IORING_NOP_CQE32)
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| 26 |
|
| 27 | int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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| 28 | {
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| 29 | struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
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| 30 |
|
| 31 | nop->flags = READ_ONCE(sqe->nop_flags);
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| 32 | if (nop->flags & ~NOP_FLAGS)
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| 33 | return -EINVAL;
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| 34 |
|
| 35 | if (nop->flags & IORING_NOP_INJECT_RESULT)
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| 36 | nop->result = READ_ONCE(sqe->len);
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| 37 | else
|
| 38 | nop->result = 0;
|
| 39 | if (nop->flags & IORING_NOP_FILE)
|
| 40 | nop->fd = READ_ONCE(sqe->fd);
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| 41 | else
|
| 42 | nop->fd = -1;
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| 43 | if (nop->flags & IORING_NOP_FIXED_FILE)
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| 44 | req->flags |= REQ_F_FIXED_FILE;
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| 45 | if (nop->flags & IORING_NOP_FIXED_BUFFER)
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| 46 | req->buf_index = READ_ONCE(sqe->buf_index);
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| 47 | if (nop->flags & IORING_NOP_CQE32) {
|
| 48 | struct io_ring_ctx *ctx = req->ctx;
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| 49 |
|
| 50 | if (!(ctx->flags & (IORING_SETUP_CQE32|IORING_SETUP_CQE_MIXED)))
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| 51 | return -EINVAL;
|
| 52 | nop->extra1 = READ_ONCE(sqe->off);
|
| 53 | nop->extra2 = READ_ONCE(sqe->addr);
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| 54 | }
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| 55 | return 0;
|
| 56 | }
|
| 57 |
|
| 58 | int io_nop(struct io_kiocb *req, unsigned int issue_flags)
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| 59 | {
|
| 60 | struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
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| 61 | int ret = nop->result;
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| 62 |
|
| 63 | if (nop->flags & IORING_NOP_FILE) {
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| 64 | if (req->flags & REQ_F_FIXED_FILE)
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| 65 | req->file = io_file_get_fixed(req, nop->fd, issue_flags);
|
| 66 | else
|
| 67 | req->file = io_file_get_normal(req, nop->fd);
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| 68 | if (!req->file) {
|
| 69 | ret = -EBADF;
|
| 70 | goto done;
|
| 71 | }
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| 72 | }
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| 73 | if (nop->flags & IORING_NOP_FIXED_BUFFER) {
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| 74 | if (!io_find_buf_node(req, issue_flags))
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| 75 | ret = -EFAULT;
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| 76 | }
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| 77 | done:
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| 78 | if (ret < 0)
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| 79 | req_set_fail(req);
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| 80 | if (nop->flags & IORING_NOP_CQE32)
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| 81 | io_req_set_res32(req, ret, 0, nop->extra1, nop->extra2);
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| 82 | else
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| 83 | io_req_set_res(req, ret, 0);
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| 84 | if (nop->flags & IORING_NOP_TW) {
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| 85 | req->io_task_work.func = io_req_task_complete;
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| 86 | io_req_task_work_add(req);
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| 87 | return IOU_ISSUE_SKIP_COMPLETE;
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| 88 | }
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| 89 | return IOU_COMPLETE;
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| 90 | }
|