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-rw-r--r--tools/hv/hv_kvp_daemon.c16
-rw-r--r--tools/hv/hv_vss_daemon.c220
2 files changed, 232 insertions, 4 deletions
diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index c800ea4c8bf..5a1f6489d18 100644
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -102,6 +102,10 @@ static struct utsname uts_buf;
#define MAX_FILE_NAME 100
#define ENTRIES_PER_BLOCK 50
+#ifndef SOL_NETLINK
+#define SOL_NETLINK 270
+#endif
+
struct kvp_record {
char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
@@ -1407,7 +1411,7 @@ netlink_send(int fd, struct cn_msg *msg)
int main(void)
{
- int fd, len, sock_opt;
+ int fd, len, nl_group;
int error;
struct cn_msg *message;
struct pollfd pfd;
@@ -1443,7 +1447,7 @@ int main(void)
addr.nl_family = AF_NETLINK;
addr.nl_pad = 0;
addr.nl_pid = 0;
- addr.nl_groups = CN_KVP_IDX;
+ addr.nl_groups = 0;
error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
@@ -1452,8 +1456,8 @@ int main(void)
close(fd);
exit(EXIT_FAILURE);
}
- sock_opt = addr.nl_groups;
- setsockopt(fd, 270, 1, &sock_opt, sizeof(sock_opt));
+ nl_group = CN_KVP_IDX;
+ setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &nl_group, sizeof(nl_group));
/*
* Register ourselves with the kernel.
*/
@@ -1499,6 +1503,10 @@ int main(void)
}
incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
+
+ if (incoming_msg->nlmsg_type != NLMSG_DONE)
+ continue;
+
incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c
new file mode 100644
index 00000000000..95269952aa9
--- /dev/null
+++ b/tools/hv/hv_vss_daemon.c
@@ -0,0 +1,220 @@
+/*
+ * An implementation of the host initiated guest snapshot for Hyper-V.
+ *
+ *
+ * Copyright (C) 2013, Microsoft, Inc.
+ * Author : K. Y. Srinivasan <kys@microsoft.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for more
+ * details.
+ *
+ */
+
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/poll.h>
+#include <linux/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <arpa/inet.h>
+#include <linux/connector.h>
+#include <linux/hyperv.h>
+#include <linux/netlink.h>
+#include <syslog.h>
+
+static char vss_recv_buffer[4096];
+static char vss_send_buffer[4096];
+static struct sockaddr_nl addr;
+
+#ifndef SOL_NETLINK
+#define SOL_NETLINK 270
+#endif
+
+
+static int vss_operate(int operation)
+{
+ char *fs_op;
+ char cmd[512];
+ char buf[512];
+ FILE *file;
+ char *p;
+ char *x;
+ int error;
+
+ switch (operation) {
+ case VSS_OP_FREEZE:
+ fs_op = "-f ";
+ break;
+ case VSS_OP_THAW:
+ fs_op = "-u ";
+ break;
+ }
+
+ file = popen("mount | awk '/^\/dev\// { print $3}'", "r");
+ if (file == NULL)
+ return;
+
+ while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
+ x = strchr(p, '\n');
+ *x = '\0';
+ if (!strncmp(p, "/", sizeof("/")))
+ continue;
+
+ sprintf(cmd, "%s %s %s", "fsfreeze ", fs_op, p);
+ syslog(LOG_INFO, "VSS cmd is %s\n", cmd);
+ error = system(cmd);
+ }
+ pclose(file);
+
+ sprintf(cmd, "%s %s %s", "fsfreeze ", fs_op, "/");
+ syslog(LOG_INFO, "VSS cmd is %s\n", cmd);
+ error = system(cmd);
+
+ return error;
+}
+
+static int netlink_send(int fd, struct cn_msg *msg)
+{
+ struct nlmsghdr *nlh;
+ unsigned int size;
+ struct msghdr message;
+ char buffer[64];
+ struct iovec iov[2];
+
+ size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
+
+ nlh = (struct nlmsghdr *)buffer;
+ nlh->nlmsg_seq = 0;
+ nlh->nlmsg_pid = getpid();
+ nlh->nlmsg_type = NLMSG_DONE;
+ nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
+ nlh->nlmsg_flags = 0;
+
+ iov[0].iov_base = nlh;
+ iov[0].iov_len = sizeof(*nlh);
+
+ iov[1].iov_base = msg;
+ iov[1].iov_len = size;
+
+ memset(&message, 0, sizeof(message));
+ message.msg_name = &addr;
+ message.msg_namelen = sizeof(addr);
+ message.msg_iov = iov;
+ message.msg_iovlen = 2;
+
+ return sendmsg(fd, &message, 0);
+}
+
+int main(void)
+{
+ int fd, len, nl_group;
+ int error;
+ struct cn_msg *message;
+ struct pollfd pfd;
+ struct nlmsghdr *incoming_msg;
+ struct cn_msg *incoming_cn_msg;
+ int op;
+ struct hv_vss_msg *vss_msg;
+
+ daemon(1, 0);
+ openlog("Hyper-V VSS", 0, LOG_USER);
+ syslog(LOG_INFO, "VSS starting; pid is:%d", getpid());
+
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
+ if (fd < 0) {
+ syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
+ exit(EXIT_FAILURE);
+ }
+ addr.nl_family = AF_NETLINK;
+ addr.nl_pad = 0;
+ addr.nl_pid = 0;
+ addr.nl_groups = 0;
+
+
+ error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
+ if (error < 0) {
+ syslog(LOG_ERR, "bind failed; error:%d", error);
+ close(fd);
+ exit(EXIT_FAILURE);
+ }
+ nl_group = CN_VSS_IDX;
+ setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &nl_group, sizeof(nl_group));
+ /*
+ * Register ourselves with the kernel.
+ */
+ message = (struct cn_msg *)vss_send_buffer;
+ message->id.idx = CN_VSS_IDX;
+ message->id.val = CN_VSS_VAL;
+ message->ack = 0;
+ vss_msg = (struct hv_vss_msg *)message->data;
+ vss_msg->vss_hdr.operation = VSS_OP_REGISTER;
+
+ message->len = sizeof(struct hv_vss_msg);
+
+ len = netlink_send(fd, message);
+ if (len < 0) {
+ syslog(LOG_ERR, "netlink_send failed; error:%d", len);
+ close(fd);
+ exit(EXIT_FAILURE);
+ }
+
+ pfd.fd = fd;
+
+ while (1) {
+ struct sockaddr *addr_p = (struct sockaddr *) &addr;
+ socklen_t addr_l = sizeof(addr);
+ pfd.events = POLLIN;
+ pfd.revents = 0;
+ poll(&pfd, 1, -1);
+
+ len = recvfrom(fd, vss_recv_buffer, sizeof(vss_recv_buffer), 0,
+ addr_p, &addr_l);
+
+ if (len < 0 || addr.nl_pid) {
+ syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
+ addr.nl_pid, errno, strerror(errno));
+ close(fd);
+ return -1;
+ }
+
+ incoming_msg = (struct nlmsghdr *)vss_recv_buffer;
+
+ if (incoming_msg->nlmsg_type != NLMSG_DONE)
+ continue;
+
+ incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
+ vss_msg = (struct hv_vss_msg *)incoming_cn_msg->data;
+ op = vss_msg->vss_hdr.operation;
+ error = HV_S_OK;
+
+ switch (op) {
+ case VSS_OP_FREEZE:
+ case VSS_OP_THAW:
+ error = vss_operate(op);
+ if (error)
+ error = HV_E_FAIL;
+ break;
+ default:
+ syslog(LOG_ERR, "Illegal op:%d\n", op);
+ }
+ vss_msg->error = error;
+ len = netlink_send(fd, incoming_cn_msg);
+ if (len < 0) {
+ syslog(LOG_ERR, "net_link send failed; error:%d", len);
+ exit(EXIT_FAILURE);
+ }
+ }
+
+}
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-10-31 11:02:46 +0000