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-rw-r--r--arch/um/drivers/ubd_user.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/arch/um/drivers/ubd_user.c b/arch/um/drivers/ubd_user.c
new file mode 100644
index 000000000..a1afe414c
--- /dev/null
+++ b/arch/um/drivers/ubd_user.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2016 Anton Ivanov (aivanov@brocade.com)
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com)
+ */
+
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sched.h>
+#include <signal.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/mman.h>
+#include <sys/param.h>
+#include <endian.h>
+#include <byteswap.h>
+
+#include "ubd.h"
+#include <os.h>
+#include <poll.h>
+
+struct pollfd kernel_pollfd;
+
+int start_io_thread(unsigned long sp, int *fd_out)
+{
+ int pid, fds[2], err;
+
+ err = os_pipe(fds, 1, 1);
+ if(err < 0){
+ printk("start_io_thread - os_pipe failed, err = %d\n", -err);
+ goto out;
+ }
+
+ kernel_fd = fds[0];
+ kernel_pollfd.fd = kernel_fd;
+ kernel_pollfd.events = POLLIN;
+ *fd_out = fds[1];
+
+ err = os_set_fd_block(*fd_out, 0);
+ err = os_set_fd_block(kernel_fd, 0);
+ if (err) {
+ printk("start_io_thread - failed to set nonblocking I/O.\n");
+ goto out_close;
+ }
+
+ pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
+ if(pid < 0){
+ err = -errno;
+ printk("start_io_thread - clone failed : errno = %d\n", errno);
+ goto out_close;
+ }
+
+ return(pid);
+
+ out_close:
+ os_close_file(fds[0]);
+ os_close_file(fds[1]);
+ kernel_fd = -1;
+ *fd_out = -1;
+ out:
+ return err;
+}
+
+int ubd_read_poll(int timeout)
+{
+ kernel_pollfd.events = POLLIN;
+ return poll(&kernel_pollfd, 1, timeout);
+}
+int ubd_write_poll(int timeout)
+{
+ kernel_pollfd.events = POLLOUT;
+ return poll(&kernel_pollfd, 1, timeout);
+}
+