forked from pool/hyper-v
- add hv_vss_daemon (fate#314921)
helper to support host initiated backup OBS-URL: https://build.opensuse.org/package/show/Virtualization/hyper-v?expand=0&rev=55
This commit is contained in:
Git OBS Bridge
225
hyper-v.tools.hv.hv_vss_daemon.c
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225
hyper-v.tools.hv.hv_vss_daemon.c
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/*
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* An implementation of the host initiated guest snapshot for Hyper-V.
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*
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*
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* Copyright (C) 2013, Microsoft, Inc.
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* Author : K. Y. Srinivasan <kys@microsoft.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/poll.h>
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#include <linux/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <linux/connector.h>
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#include <linux/hyperv.h>
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#include <linux/netlink.h>
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#include <syslog.h>
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static char vss_recv_buffer[4096];
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static char vss_send_buffer[4096];
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static struct sockaddr_nl addr;
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#ifndef SOL_NETLINK
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#define SOL_NETLINK 270
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#endif
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static int vss_operate(int operation)
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{
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char *fs_op;
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char cmd[512];
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char buf[512];
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FILE *file;
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char *p;
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char *x;
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int error = -1;
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switch (operation) {
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case VSS_OP_FREEZE:
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fs_op = "-f ";
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break;
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case VSS_OP_THAW:
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fs_op = "-u ";
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break;
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default:
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goto out;
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}
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file = popen("mount | awk '/^\\/dev\\// { print $3}'", "r");
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if (file == NULL)
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goto out;
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while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
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x = strchr(p, '\n');
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*x = '\0';
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if (!strncmp(p, "/", sizeof("/")))
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continue;
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sprintf(cmd, "%s %s %s", "fsfreeze ", fs_op, p);
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syslog(LOG_INFO, "VSS cmd is %s\n", cmd);
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error = system(cmd);
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}
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pclose(file);
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sprintf(cmd, "%s %s %s", "fsfreeze ", fs_op, "/");
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syslog(LOG_INFO, "VSS cmd is %s\n", cmd);
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error = system(cmd);
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out:
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return error;
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}
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static int netlink_send(int fd, struct cn_msg *msg)
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{
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struct nlmsghdr *nlh;
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unsigned int size;
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struct msghdr message;
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char buffer[64];
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struct iovec iov[2];
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size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len);
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nlh = (struct nlmsghdr *)buffer;
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nlh->nlmsg_seq = 0;
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nlh->nlmsg_pid = getpid();
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nlh->nlmsg_type = NLMSG_DONE;
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nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
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nlh->nlmsg_flags = 0;
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iov[0].iov_base = nlh;
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iov[0].iov_len = sizeof(*nlh);
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iov[1].iov_base = msg;
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iov[1].iov_len = size;
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memset(&message, 0, sizeof(message));
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message.msg_name = &addr;
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message.msg_namelen = sizeof(addr);
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message.msg_iov = iov;
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message.msg_iovlen = 2;
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return sendmsg(fd, &message, 0);
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}
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int main(void)
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{
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int fd, len, nl_group;
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int error;
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struct cn_msg *message;
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struct pollfd pfd;
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struct nlmsghdr *incoming_msg;
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struct cn_msg *incoming_cn_msg;
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int op;
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struct hv_vss_msg *vss_msg;
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if (daemon(1, 0))
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return 1;
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openlog("Hyper-V VSS", 0, LOG_USER);
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syslog(LOG_INFO, "VSS starting; pid is:%d", getpid());
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fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
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if (fd < 0) {
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syslog(LOG_ERR, "netlink socket creation failed; error:%d", fd);
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exit(EXIT_FAILURE);
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}
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addr.nl_family = AF_NETLINK;
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addr.nl_pad = 0;
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addr.nl_pid = 0;
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addr.nl_groups = 0;
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error = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
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if (error < 0) {
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syslog(LOG_ERR, "bind failed; error:%d", error);
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close(fd);
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exit(EXIT_FAILURE);
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}
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nl_group = CN_VSS_IDX;
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setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &nl_group, sizeof(nl_group));
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/*
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* Register ourselves with the kernel.
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*/
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message = (struct cn_msg *)vss_send_buffer;
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message->id.idx = CN_VSS_IDX;
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message->id.val = CN_VSS_VAL;
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message->ack = 0;
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vss_msg = (struct hv_vss_msg *)message->data;
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vss_msg->vss_hdr.operation = VSS_OP_REGISTER;
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message->len = sizeof(struct hv_vss_msg);
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len = netlink_send(fd, message);
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if (len < 0) {
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syslog(LOG_ERR, "netlink_send failed; error:%d", len);
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close(fd);
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exit(EXIT_FAILURE);
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}
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pfd.fd = fd;
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while (1) {
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struct sockaddr *addr_p = (struct sockaddr *) &addr;
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socklen_t addr_l = sizeof(addr);
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pfd.events = POLLIN;
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pfd.revents = 0;
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poll(&pfd, 1, -1);
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len = recvfrom(fd, vss_recv_buffer, sizeof(vss_recv_buffer), 0,
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addr_p, &addr_l);
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if (len < 0 || addr.nl_pid) {
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syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
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addr.nl_pid, errno, strerror(errno));
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close(fd);
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return -1;
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}
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incoming_msg = (struct nlmsghdr *)vss_recv_buffer;
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if (incoming_msg->nlmsg_type != NLMSG_DONE)
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continue;
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incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
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vss_msg = (struct hv_vss_msg *)incoming_cn_msg->data;
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op = vss_msg->vss_hdr.operation;
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error = HV_S_OK;
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switch (op) {
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case VSS_OP_FREEZE:
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case VSS_OP_THAW:
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error = vss_operate(op);
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if (error)
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error = HV_E_FAIL;
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break;
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default:
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syslog(LOG_ERR, "Illegal op:%d\n", op);
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}
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vss_msg->error = error;
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len = netlink_send(fd, incoming_cn_msg);
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if (len < 0) {
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syslog(LOG_ERR, "net_link send failed; error:%d", len);
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exit(EXIT_FAILURE);
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}
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}
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}
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