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tools: hv: use FIFREEZE/FITHAW in hv_vss_daemon 

As suggested by Paolo Bonzini, use ioctl instead of calling fsfreeze.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Olaf Hering 2013-04-24 07:48:52 -07:00 committed by Greg Kroah-Hartman
parent d3d1ee3ab2
commit 7b413b6553
1 changed files with 22 additions and 9 deletions
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31
tools/hv/hv_vss_daemon.c
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@ -21,7 +21,9 @@
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/poll.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <mntent.h>
#include <stdlib.h>
@ -30,6 +32,7 @@
#include <ctype.h>
#include <errno.h>
#include <arpa/inet.h>
#include <linux/fs.h>
#include <linux/connector.h>
#include <linux/hyperv.h>
#include <linux/netlink.h>
@ -44,21 +47,35 @@ static struct sockaddr_nl addr;
#endif
static int vss_do_freeze(char *dir, unsigned int cmd, char *fs_op)
{
int ret, fd = open(dir, O_RDONLY);
if (fd < 0)
return 1;
ret = ioctl(fd, cmd, 0);
syslog(LOG_INFO, "VSS: %s of %s: %s\n", fs_op, dir, strerror(errno));
close(fd);
return !!ret;
}
static int vss_operate(int operation)
{
char *fs_op;
char cmd[512];
char match[] = "/dev/";
FILE *mounts;
struct mntent *ent;
unsigned int cmd;
int error = 0, root_seen = 0;
switch (operation) {
case VSS_OP_FREEZE:
fs_op = "-f ";
cmd = FIFREEZE;
fs_op = "freeze";
break;
case VSS_OP_THAW:
fs_op = "-u ";
cmd = FITHAW;
fs_op = "thaw";
break;
default:
return -1;
@ -75,16 +92,12 @@ static int vss_operate(int operation)
root_seen = 1;
continue;
}
snprintf(cmd, sizeof(cmd), "fsfreeze %s '%s'", fs_op, ent->mnt_dir);
syslog(LOG_INFO, "VSS cmd is %s\n", cmd);
error |= system(cmd);
error |= vss_do_freeze(ent->mnt_dir, cmd, fs_op);
}
endmntent(mounts);
if (root_seen) {
sprintf(cmd, "fsfreeze %s /", fs_op);
syslog(LOG_INFO, "VSS cmd is %s\n", cmd);
error |= system(cmd);
error |= vss_do_freeze("/", cmd, fs_op);
}
return error;