2 * An implementation of host to guest copy functionality for Linux.
4 * Copyright (C) 2014, Microsoft, Inc.
6 * Author : K. Y. Srinivasan <kys@microsoft.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
15 * NON INFRINGEMENT. See the GNU General Public License for more
20 #include <sys/types.h>
21 #include <sys/socket.h>
23 #include <linux/types.h>
24 #include <linux/kdev_t.h>
31 #include <linux/hyperv.h>
38 static char target_fname[W_MAX_PATH];
40 static int hv_start_fcopy(struct hv_start_fcopy *smsg)
42 int error = HV_E_FAIL;
46 * If possile append a path seperator to the path.
48 if (strlen((char *)smsg->path_name) < (W_MAX_PATH - 2))
49 strcat((char *)smsg->path_name, "/");
51 p = (char *)smsg->path_name;
52 snprintf(target_fname, sizeof(target_fname), "%s/%s",
53 (char *)smsg->path_name, smsg->file_name);
55 syslog(LOG_INFO, "Target file name: %s", target_fname);
57 * Check to see if the path is already in place; if not,
60 while ((q = strchr(p, '/')) != NULL) {
66 if (access((char *)smsg->path_name, F_OK)) {
67 if (smsg->copy_flags & CREATE_PATH) {
68 if (mkdir((char *)smsg->path_name, 0755)) {
69 syslog(LOG_ERR, "Failed to create %s",
70 (char *)smsg->path_name);
74 syslog(LOG_ERR, "Invalid path: %s",
75 (char *)smsg->path_name);
83 if (!access(target_fname, F_OK)) {
84 syslog(LOG_INFO, "File: %s exists", target_fname);
85 if (!(smsg->copy_flags & OVER_WRITE)) {
86 error = HV_ERROR_ALREADY_EXISTS;
91 target_fd = open(target_fname, O_RDWR | O_CREAT | O_CLOEXEC, 0744);
92 if (target_fd == -1) {
93 syslog(LOG_INFO, "Open Failed: %s", strerror(errno));
102 static int hv_copy_data(struct hv_do_fcopy *cpmsg)
104 ssize_t bytes_written;
106 bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size,
109 if (bytes_written != cpmsg->size)
115 static int hv_copy_finished(void)
120 static int hv_copy_cancel(void)
123 unlink(target_fname);
130 int fd, fcopy_fd, len;
132 int version = FCOPY_CURRENT_VERSION;
133 char *buffer[4096 * 2];
134 struct hv_fcopy_hdr *in_msg;
137 syslog(LOG_ERR, "daemon() failed; error: %s", strerror(errno));
141 openlog("HV_FCOPY", 0, LOG_USER);
142 syslog(LOG_INFO, "HV_FCOPY starting; pid is:%d", getpid());
144 fcopy_fd = open("/dev/vmbus/hv_fcopy", O_RDWR);
147 syslog(LOG_ERR, "open /dev/vmbus/hv_fcopy failed; error: %d %s",
148 errno, strerror(errno));
153 * Register with the kernel.
155 if ((write(fcopy_fd, &version, sizeof(int))) != sizeof(int)) {
156 syslog(LOG_ERR, "Registration failed: %s", strerror(errno));
162 * In this loop we process fcopy messages after the
163 * handshake is complete.
165 len = pread(fcopy_fd, buffer, (4096 * 2), 0);
167 syslog(LOG_ERR, "pread failed: %s", strerror(errno));
170 in_msg = (struct hv_fcopy_hdr *)buffer;
172 switch (in_msg->operation) {
173 case START_FILE_COPY:
174 error = hv_start_fcopy((struct hv_start_fcopy *)in_msg);
177 error = hv_copy_data((struct hv_do_fcopy *)in_msg);
180 error = hv_copy_finished();
183 error = hv_copy_cancel();
187 syslog(LOG_ERR, "Unknown operation: %d",
192 if (pwrite(fcopy_fd, &error, sizeof(int), 0) != sizeof(int)) {
193 syslog(LOG_ERR, "pwrite failed: %s", strerror(errno));