1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2016 Anton Ivanov (aivanov@brocade.com)
4 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
5 * Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com)
6 */
7
8 #include <stddef.h>
9 #include <unistd.h>
10 #include <errno.h>
11 #include <sched.h>
12 #include <signal.h>
13 #include <string.h>
14 #include <netinet/in.h>
15 #include <sys/time.h>
16 #include <sys/socket.h>
17 #include <sys/mman.h>
18 #include <sys/param.h>
19 #include <endian.h>
20 #include <byteswap.h>
21
22 #include "ubd.h"
23 #include <os.h>
24 #include <poll.h>
25
26 static struct pollfd kernel_pollfd;
27
28 int start_io_thread(unsigned long sp, int *fd_out)
29 {
30 int pid, fds[2], err;
31
32 err = os_pipe(fds, 1, 1);
33 if(err < 0){
34 printk("start_io_thread - os_pipe failed, err = %d\n", -err);
35 goto out;
36 }
37
38 kernel_fd = fds[0];
39 kernel_pollfd.fd = kernel_fd;
40 kernel_pollfd.events = POLLIN;
41 *fd_out = fds[1];
42
43 err = os_set_fd_block(*fd_out, 0);
44 err = os_set_fd_block(kernel_fd, 0);
45 if (err) {
46 printk("start_io_thread - failed to set nonblocking I/O.\n");
47 goto out_close;
48 }
49
50 pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
51 if(pid < 0){
52 err = -errno;
53 printk("start_io_thread - clone failed : errno = %d\n", errno);
54 goto out_close;
55 }
56
57 return(pid);
58
59 out_close:
60 os_close_file(fds[0]);
61 os_close_file(fds[1]);
62 kernel_fd = -1;
63 *fd_out = -1;
64 out:
65 return err;
66 }
67
68 int ubd_read_poll(int timeout)
69 {
70 kernel_pollfd.events = POLLIN;
71 return poll(&kernel_pollfd, 1, timeout);
72 }
73 int ubd_write_poll(int timeout)
74 {
75 kernel_pollfd.events = POLLOUT;
76 return poll(&kernel_pollfd, 1, timeout);
77 }
78
79
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