As suggested by Paolo Bonzini, use ioctl instead of calling fsfreeze.
Signed-off-by: Olaf Hering <o...@aepfle.de>
---
NOT runtime tested!!
tools/hv/hv_vss_daemon.c | 31 ++++++++++++++++++++++---------
1 file changed, 22 insertions(+), 9 deletions(-)
diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c
index e37d86c..830d606 100644
--- a/tools/hv/hv_vss_daemon.c
+++ b/tools/hv/hv_vss_daemon.c
@@ -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;
--
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