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netif rename: optimistic loop for the name to become free

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Parts from Ubuntu's 70-ifrename.patch.
This commit is contained in:
Kay Sievers 2006-07-03 00:58:35 +02:00
parent e0595b53b5
commit b879c303a7
3 changed files with 40 additions and 8 deletions
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2
extras/volume_id/lib/reiserfs.c
View File

@ -66,7 +66,7 @@ int volume_id_probe_reiserfs(struct volume_id *id, uint64_t off)
if (buf == NULL)
return -1;
rs = (struct reiserfs_super_block *) buf;;
rs = (struct reiserfs_super_block *) buf;
if (memcmp(rs->magic, "ReIsErFs", 8) == 0) {
strcpy(id->type_version, "3.5");
id->type = "reiserfs";

44
udev_device.c
View File

@ -81,7 +81,7 @@ dev_t udev_device_get_devt(struct udevice *udev)
return makedev(0, 0);
}
static int rename_net_if(struct udevice *udev)
static int rename_netif(struct udevice *udev)
{
int sk;
struct ifreq ifr;
@ -100,12 +100,44 @@ static int rename_net_if(struct udevice *udev)
memset(&ifr, 0x00, sizeof(struct ifreq));
strlcpy(ifr.ifr_name, udev->dev->kernel_name, IFNAMSIZ);
strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
retval = ioctl(sk, SIOCSIFNAME, &ifr);
if (retval != 0)
err("error changing net interface name: %s", strerror(errno));
close(sk);
if (retval != 0) {
int loop;
/* see if the destination interface name already exists */
if (errno != EEXIST) {
err("error changing netif name: %s", strerror(errno));
goto exit;
}
/* free our own name, another process may wait for us */
strlcpy(ifr.ifr_newname, udev->dev->kernel_name, IFNAMSIZ);
strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
retval = ioctl(sk, SIOCSIFNAME, &ifr);
if (retval != 0) {
err("error changing netif name: %s", strerror(errno));
goto exit;
}
/* wait 30 seconds for our target to become available */
strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
loop = 30 * 20;
while (loop--) {
retval = ioctl(sk, SIOCSIFNAME, &ifr);
if (retval != 0) {
if (errno != EEXIST) {
err("error changing net interface name: %s", strerror(errno));
break;
}
dbg("wait for netif '%s' to become free, loop=%i", udev->name, (30 * 20) - loop);
usleep(1000 * 1000 / 20);
}
}
}
exit:
close(sk);
return retval;
}
@ -181,7 +213,7 @@ int udev_device_event(struct udev_rules *rules, struct udevice *udev)
if (strcmp(udev->name, udev->dev->kernel_name) != 0) {
char *pos;
retval = rename_net_if(udev);
retval = rename_netif(udev);
if (retval != 0)
goto exit;
info("renamed netif to '%s'", udev->name);

2
udevd.h
View File

@ -32,7 +32,7 @@
#define EVENT_SEQNUM ".udev/uevent_seqnum"
/* maximum limit of forked childs */
#define UDEVD_MAX_CHILDS 64
#define UDEVD_MAX_CHILDS 256
/* start to throttle forking if maximum number of running childs in our session is reached */
#define UDEVD_MAX_CHILDS_RUNNING 16