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authorEric W. Biederman <ebiederm@xmission.com>2007-09-12 13:48:45 +0200
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:49:11 -0700
commitb267b179648e46ea8e2a44f7314a23eb6aee1d6c (patch)
treef5ad81414be89f41114e2aa63d038fd7eac08c1d /net
parent881d966b48b035ab3f3aeaae0f3d3f9b584f45b2 (diff)
[NET]: Factor out __dev_alloc_name from dev_alloc_name
When forcibly changing the network namespace of a device I need something that can generate a name for the device in the new namespace without overwriting the old name. __dev_alloc_name provides me that functionality. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/dev.c48
1 files changed, 35 insertions, 13 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 3a3d5ee7390..520ef7b2086 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -739,9 +739,10 @@ int dev_valid_name(const char *name)
}
/**
- * dev_alloc_name - allocate a name for a device
- * @dev: device
+ * __dev_alloc_name - allocate a name for a device
+ * @net: network namespace to allocate the device name in
* @name: name format string
+ * @buf: scratch buffer and result name string
*
* Passed a format string - eg "lt%d" it will try and find a suitable
* id. It scans list of devices to build up a free map, then chooses
@@ -752,18 +753,13 @@ int dev_valid_name(const char *name)
* Returns the number of the unit assigned or a negative errno code.
*/
-int dev_alloc_name(struct net_device *dev, const char *name)
+static int __dev_alloc_name(struct net *net, const char *name, char *buf)
{
int i = 0;
- char buf[IFNAMSIZ];
const char *p;
const int max_netdevices = 8*PAGE_SIZE;
long *inuse;
struct net_device *d;
- struct net *net;
-
- BUG_ON(!dev->nd_net);
- net = dev->nd_net;
p = strnchr(name, IFNAMSIZ-1, '%');
if (p) {
@@ -787,7 +783,7 @@ int dev_alloc_name(struct net_device *dev, const char *name)
continue;
/* avoid cases where sscanf is not exact inverse of printf */
- snprintf(buf, sizeof(buf), name, i);
+ snprintf(buf, IFNAMSIZ, name, i);
if (!strncmp(buf, d->name, IFNAMSIZ))
set_bit(i, inuse);
}
@@ -796,11 +792,9 @@ int dev_alloc_name(struct net_device *dev, const char *name)
free_page((unsigned long) inuse);
}
- snprintf(buf, sizeof(buf), name, i);
- if (!__dev_get_by_name(net, buf)) {
- strlcpy(dev->name, buf, IFNAMSIZ);
+ snprintf(buf, IFNAMSIZ, name, i);
+ if (!__dev_get_by_name(net, buf))
return i;
- }
/* It is possible to run out of possible slots
* when the name is long and there isn't enough space left
@@ -809,6 +803,34 @@ int dev_alloc_name(struct net_device *dev, const char *name)
return -ENFILE;
}
+/**
+ * dev_alloc_name - allocate a name for a device
+ * @dev: device
+ * @name: name format string
+ *
+ * Passed a format string - eg "lt%d" it will try and find a suitable
+ * id. It scans list of devices to build up a free map, then chooses
+ * the first empty slot. The caller must hold the dev_base or rtnl lock
+ * while allocating the name and adding the device in order to avoid
+ * duplicates.
+ * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
+ * Returns the number of the unit assigned or a negative errno code.
+ */
+
+int dev_alloc_name(struct net_device *dev, const char *name)
+{
+ char buf[IFNAMSIZ];
+ struct net *net;
+ int ret;
+
+ BUG_ON(!dev->nd_net);
+ net = dev->nd_net;
+ ret = __dev_alloc_name(net, name, buf);
+ if (ret >= 0)
+ strlcpy(dev->name, buf, IFNAMSIZ);
+ return ret;
+}
+
/**
* dev_change_name - change name of a device