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udev: network device renaming - immediately give up if the target name isn't available

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This commit is contained in:
Kay Sievers 2012-07-05 17:40:50 +02:00
parent 47ef94ac5f
commit 97595710b7
1 changed files with 9 additions and 60 deletions
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69
src/udev/udev-event.c
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@ -745,32 +745,11 @@ out:
return err;
}
static void rename_netif_kernel_log(struct ifreq ifr)
{
int klog;
FILE *f;
klog = open("/dev/kmsg", O_WRONLY|O_CLOEXEC);
if (klog < 0)
return;
f = fdopen(klog, "w");
if (f == NULL) {
close(klog);
return;
}
fprintf(f, "<30>udevd[%u]: renamed network interface %s to %s\n",
getpid(), ifr.ifr_name, ifr.ifr_newname);
fclose(f);
}
static int rename_netif(struct udev_event *event)
{
struct udev_device *dev = event->dev;
int sk;
struct ifreq ifr;
int loop;
int err;
log_debug("changing net interface name from '%s' to '%s'\n",
@ -787,49 +766,19 @@ static int rename_netif(struct udev_event *event)
util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev));
util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
err = ioctl(sk, SIOCSIFNAME, &ifr);
if (err == 0) {
rename_netif_kernel_log(ifr);
goto out;
}
if (err >= 0) {
FILE *f;
/* keep trying if the destination interface name already exists */
err = -errno;
if (err != -EEXIST)
goto out;
/* free our own name, another process may wait for us */
snprintf(ifr.ifr_newname, IFNAMSIZ, "rename%u", udev_device_get_ifindex(dev));
err = ioctl(sk, SIOCSIFNAME, &ifr);
if (err < 0) {
err = -errno;
goto out;
}
/* log temporary name */
rename_netif_kernel_log(ifr);
/* wait a maximum of 90 seconds for our target to become available */
util_strscpy(ifr.ifr_name, IFNAMSIZ, ifr.ifr_newname);
util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
loop = 90 * 20;
while (loop--) {
const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
nanosleep(&duration, NULL);
err = ioctl(sk, SIOCSIFNAME, &ifr);
if (err == 0) {
rename_netif_kernel_log(ifr);
break;
f = fopen("/dev/kmsg", "we");
if (f != NULL) {
fprintf(f, "<30>systemd-udevd[%u]: renamed network interface %s to %s\n",
getpid(), ifr.ifr_name, ifr.ifr_newname);
fclose(f);
}
} else {
err = -errno;
if (err != -EEXIST)
break;
}
out:
if (err < 0)
log_error("error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname);
}
close(sk);
return err;
}