blob: a1afe414ce481481adb956675783b78660a9ab46 [file] [log] [blame]
Alex Dewardbddf422019-08-25 10:49:16 +01001// SPDX-License-Identifier: GPL-2.0
Anton Ivanovf88f0bd2016-11-09 20:43:25 +00002/*
3 * Copyright (C) 2016 Anton Ivanov (aivanov@brocade.com)
Jeff Dike91acb212005-10-10 23:10:32 -04004 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
5 * Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com)
Jeff Dike91acb212005-10-10 23:10:32 -04006 */
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>
Jeff Dike91acb212005-10-10 23:10:32 -040019#include <endian.h>
20#include <byteswap.h>
21
Al Viro8ea3c062011-08-18 18:04:41 -040022#include "ubd.h"
Al Viro37185b32012-10-08 03:27:32 +010023#include <os.h>
Anton Ivanovf88f0bd2016-11-09 20:43:25 +000024#include <poll.h>
25
26struct pollfd kernel_pollfd;
Al Viro8ea3c062011-08-18 18:04:41 -040027
Jeff Dike91acb212005-10-10 23:10:32 -040028int 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];
Anton Ivanovf88f0bd2016-11-09 20:43:25 +000039 kernel_pollfd.fd = kernel_fd;
40 kernel_pollfd.events = POLLIN;
Jeff Dike91acb212005-10-10 23:10:32 -040041 *fd_out = fds[1];
42
Eduard-Gabriel Munteanu89df6bf2007-07-15 23:38:51 -070043 err = os_set_fd_block(*fd_out, 0);
Anton Ivanovf88f0bd2016-11-09 20:43:25 +000044 err = os_set_fd_block(kernel_fd, 0);
Eduard-Gabriel Munteanu89df6bf2007-07-15 23:38:51 -070045 if (err) {
46 printk("start_io_thread - failed to set nonblocking I/O.\n");
47 goto out_close;
48 }
49
Stanislaw Gruszka4dbed852007-12-17 16:19:46 -080050 pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
Jeff Dike91acb212005-10-10 23:10:32 -040051 if(pid < 0){
Jeff Dike91acb212005-10-10 23:10:32 -040052 err = -errno;
Jeff Dike56bd1942007-05-06 14:51:02 -070053 printk("start_io_thread - clone failed : errno = %d\n", errno);
Jeff Dike91acb212005-10-10 23:10:32 -040054 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:
Jeff Dike56bd1942007-05-06 14:51:02 -070065 return err;
Jeff Dike91acb212005-10-10 23:10:32 -040066}
Anton Ivanovf88f0bd2016-11-09 20:43:25 +000067
68int ubd_read_poll(int timeout)
69{
70 kernel_pollfd.events = POLLIN;
71 return poll(&kernel_pollfd, 1, timeout);
72}
73int ubd_write_poll(int timeout)
74{
75 kernel_pollfd.events = POLLOUT;
76 return poll(&kernel_pollfd, 1, timeout);
77}
78