1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2016 Anton Ivanov (aivanov@brocade.com)
4*4882a593Smuzhiyun * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
5*4882a593Smuzhiyun * Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com)
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <stddef.h>
9*4882a593Smuzhiyun #include <unistd.h>
10*4882a593Smuzhiyun #include <errno.h>
11*4882a593Smuzhiyun #include <sched.h>
12*4882a593Smuzhiyun #include <signal.h>
13*4882a593Smuzhiyun #include <string.h>
14*4882a593Smuzhiyun #include <netinet/in.h>
15*4882a593Smuzhiyun #include <sys/time.h>
16*4882a593Smuzhiyun #include <sys/socket.h>
17*4882a593Smuzhiyun #include <sys/mman.h>
18*4882a593Smuzhiyun #include <sys/param.h>
19*4882a593Smuzhiyun #include <endian.h>
20*4882a593Smuzhiyun #include <byteswap.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun #include "ubd.h"
23*4882a593Smuzhiyun #include <os.h>
24*4882a593Smuzhiyun #include <poll.h>
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun struct pollfd kernel_pollfd;
27*4882a593Smuzhiyun
start_io_thread(unsigned long sp,int * fd_out)28*4882a593Smuzhiyun int start_io_thread(unsigned long sp, int *fd_out)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun int pid, fds[2], err;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun err = os_pipe(fds, 1, 1);
33*4882a593Smuzhiyun if(err < 0){
34*4882a593Smuzhiyun printk("start_io_thread - os_pipe failed, err = %d\n", -err);
35*4882a593Smuzhiyun goto out;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun kernel_fd = fds[0];
39*4882a593Smuzhiyun kernel_pollfd.fd = kernel_fd;
40*4882a593Smuzhiyun kernel_pollfd.events = POLLIN;
41*4882a593Smuzhiyun *fd_out = fds[1];
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun err = os_set_fd_block(*fd_out, 0);
44*4882a593Smuzhiyun err = os_set_fd_block(kernel_fd, 0);
45*4882a593Smuzhiyun if (err) {
46*4882a593Smuzhiyun printk("start_io_thread - failed to set nonblocking I/O.\n");
47*4882a593Smuzhiyun goto out_close;
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
51*4882a593Smuzhiyun if(pid < 0){
52*4882a593Smuzhiyun err = -errno;
53*4882a593Smuzhiyun printk("start_io_thread - clone failed : errno = %d\n", errno);
54*4882a593Smuzhiyun goto out_close;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun return(pid);
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun out_close:
60*4882a593Smuzhiyun os_close_file(fds[0]);
61*4882a593Smuzhiyun os_close_file(fds[1]);
62*4882a593Smuzhiyun kernel_fd = -1;
63*4882a593Smuzhiyun *fd_out = -1;
64*4882a593Smuzhiyun out:
65*4882a593Smuzhiyun return err;
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
ubd_read_poll(int timeout)68*4882a593Smuzhiyun int ubd_read_poll(int timeout)
69*4882a593Smuzhiyun {
70*4882a593Smuzhiyun kernel_pollfd.events = POLLIN;
71*4882a593Smuzhiyun return poll(&kernel_pollfd, 1, timeout);
72*4882a593Smuzhiyun }
ubd_write_poll(int timeout)73*4882a593Smuzhiyun int ubd_write_poll(int timeout)
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun kernel_pollfd.events = POLLOUT;
76*4882a593Smuzhiyun return poll(&kernel_pollfd, 1, timeout);
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
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