| 1 | |
| 2 | #include <linux/kernel.h>
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| 3 | #include <linux/errno.h>
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| 4 | #include <linux/file.h>
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| 5 | #include <linux/fs.h>
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| 6 | #include <linux/uaccess.h>
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| 7 | #include <linux/io_uring.h>
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| 8 | #include <linux/eventpoll.h>
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| 9 |
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| 10 | #include <uapi/linux/io_uring.h>
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| 11 |
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| 12 | #include "io_uring.h"
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| 13 | #include "epoll.h"
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| 14 |
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| 15 | struct io_epoll {
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| 16 | struct file *file;
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| 17 | int epfd;
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| 18 | int op;
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| 19 | int fd;
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| 20 | struct epoll_event event;
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| 21 | };
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| 22 |
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| 23 | struct io_epoll_wait {
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| 24 | struct file *file;
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| 25 | int maxevents;
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| 26 | struct epoll_event __user *events;
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| 27 | };
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| 28 |
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| 29 | int io_epoll_ctl_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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| 30 | {
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| 31 | struct io_epoll *epoll = io_kiocb_to_cmd(req, struct io_epoll);
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| 32 |
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| 33 | if (sqe->buf_index || sqe->splice_fd_in)
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| 34 | return -EINVAL;
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| 35 |
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| 36 | epoll->epfd = READ_ONCE(sqe->fd);
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| 37 | epoll->op = READ_ONCE(sqe->len);
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| 38 | epoll->fd = READ_ONCE(sqe->off);
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| 39 |
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| 40 | if (ep_op_has_event(epoll->op)) {
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| 41 | struct epoll_event __user *ev;
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| 42 |
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| 43 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr));
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| 44 | if (copy_from_user(&epoll->event, ev, sizeof(*ev)))
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| 45 | return -EFAULT;
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| 46 | }
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| 47 |
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| 48 | return 0;
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| 49 | }
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| 50 |
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| 51 | int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags)
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| 52 | {
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| 53 | struct io_epoll *ie = io_kiocb_to_cmd(req, struct io_epoll);
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| 54 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
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| 55 | struct epoll_key key;
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| 56 | int ret;
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| 57 |
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| 58 | CLASS(fd, f)(ie->epfd);
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| 59 | if (fd_empty(f))
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| 60 | return -EBADF;
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| 61 |
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| 62 | CLASS(fd, tf)(ie->fd);
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| 63 | if (fd_empty(tf))
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| 64 | return -EBADF;
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| 65 |
|
| 66 | key.file = fd_file(tf);
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| 67 | key.fd = ie->fd;
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| 68 | ret = do_epoll_ctl_file(fd_file(f), ie->op, &key, &ie->event, force_nonblock);
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| 69 | if (force_nonblock && ret == -EAGAIN)
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| 70 | return -EAGAIN;
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| 71 |
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| 72 | if (ret < 0)
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| 73 | req_set_fail(req);
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| 74 | io_req_set_res(req, ret, 0);
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| 75 | return IOU_COMPLETE;
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| 76 | }
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| 77 |
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| 78 | int io_epoll_wait_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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| 79 | {
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| 80 | struct io_epoll_wait *iew = io_kiocb_to_cmd(req, struct io_epoll_wait);
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| 81 |
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| 82 | if (sqe->off || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
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| 83 | return -EINVAL;
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| 84 |
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| 85 | iew->maxevents = READ_ONCE(sqe->len);
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| 86 | iew->events = u64_to_user_ptr(READ_ONCE(sqe->addr));
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| 87 | return 0;
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| 88 | }
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| 89 |
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| 90 | int io_epoll_wait(struct io_kiocb *req, unsigned int issue_flags)
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| 91 | {
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| 92 | struct io_epoll_wait *iew = io_kiocb_to_cmd(req, struct io_epoll_wait);
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| 93 | int ret;
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| 94 |
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| 95 | ret = epoll_sendevents(req->file, iew->events, iew->maxevents);
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| 96 | if (ret == 0)
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| 97 | return -EAGAIN;
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| 98 | if (ret < 0)
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| 99 | req_set_fail(req);
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| 100 |
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| 101 | io_req_set_res(req, ret, 0);
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| 102 | return IOU_COMPLETE;
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| 103 | }
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