Alex Dewar | dbddf42 | 2019-08-25 10:49:16 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2016 Anton Ivanov (aivanov@brocade.com) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 4 | * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) |
| 5 | * Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com) |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 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> |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 19 | #include <endian.h> |
| 20 | #include <byteswap.h> |
| 21 | |
Al Viro | 8ea3c06 | 2011-08-18 18:04:41 -0400 | [diff] [blame] | 22 | #include "ubd.h" |
Al Viro | 37185b3 | 2012-10-08 03:27:32 +0100 | [diff] [blame] | 23 | #include <os.h> |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 24 | #include <poll.h> |
| 25 | |
| 26 | struct pollfd kernel_pollfd; |
Al Viro | 8ea3c06 | 2011-08-18 18:04:41 -0400 | [diff] [blame] | 27 | |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 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]; |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 39 | kernel_pollfd.fd = kernel_fd; |
| 40 | kernel_pollfd.events = POLLIN; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 41 | *fd_out = fds[1]; |
| 42 | |
Eduard-Gabriel Munteanu | 89df6bf | 2007-07-15 23:38:51 -0700 | [diff] [blame] | 43 | err = os_set_fd_block(*fd_out, 0); |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 44 | err = os_set_fd_block(kernel_fd, 0); |
Eduard-Gabriel Munteanu | 89df6bf | 2007-07-15 23:38:51 -0700 | [diff] [blame] | 45 | if (err) { |
| 46 | printk("start_io_thread - failed to set nonblocking I/O.\n"); |
| 47 | goto out_close; |
| 48 | } |
| 49 | |
Stanislaw Gruszka | 4dbed85 | 2007-12-17 16:19:46 -0800 | [diff] [blame] | 50 | pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 51 | if(pid < 0){ |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 52 | err = -errno; |
Jeff Dike | 56bd194 | 2007-05-06 14:51:02 -0700 | [diff] [blame] | 53 | printk("start_io_thread - clone failed : errno = %d\n", errno); |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 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: |
Jeff Dike | 56bd194 | 2007-05-06 14:51:02 -0700 | [diff] [blame] | 65 | return err; |
Jeff Dike | 91acb21 | 2005-10-10 23:10:32 -0400 | [diff] [blame] | 66 | } |
Anton Ivanov | f88f0bd | 2016-11-09 20:43:25 +0000 | [diff] [blame] | 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 | |