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