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 | 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 | |