drivers/net/bonding/bond_sysfs.c


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/*
 * Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/sysdev.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/in.h>
#include <linux/sysfs.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <linux/rtnetlink.h>
#include <net/net_namespace.h>

#include "bonding.h"

#define to_dev(obj)	container_of(obj,struct device,kobj)
#define to_bond(cd)	((struct bonding *)(netdev_priv(to_net_dev(cd))))

/*---------------------------- Declarations -------------------------------*/

static int expected_refcount = -1;
/*--------------------------- Data Structures -----------------------------*/

/* Bonding sysfs lock.  Why can't we just use the subsystem lock?
 * Because kobject_register tries to acquire the subsystem lock.  If
 * we already hold the lock (which we would if the user was creating
 * a new bond through the sysfs interface), we deadlock.
 * This lock is only needed when deleting a bond - we need to make sure
 * that we don't collide with an ongoing ioctl.
 */

struct rw_semaphore bonding_rwsem;


/*------------------------------ Functions --------------------------------*/

/*
 * "show" function for the bond_masters attribute.
 * The class parameter is ignored.
 */
static ssize_t bonding_show_bonds(struct class *cls, char *buf)
{
	int res = 0;
	struct bonding *bond;

	down_read(&(bonding_rwsem));

	list_for_each_entry(bond, &bond_dev_list, bond_list) {
		if (res > (PAGE_SIZE - IFNAMSIZ)) {
			/* not enough space for another interface name */
			if ((PAGE_SIZE - res) > 10)
				res = PAGE_SIZE - 10;
			res += sprintf(buf + res, "++more++ ");
			break;
		}
		res += sprintf(buf + res, "%s ", bond->dev->name);
	}
	if (res)
		buf[res-1] = '\n'; /* eat the leftover space */
	up_read(&(bonding_rwsem));
	return res;
}

/*
 * "store" function for the bond_masters attribute.  This is what
 * creates and deletes entire bonds.
 *
 * The class parameter is ignored.
 *
 */

static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t count)
{
	char command[IFNAMSIZ + 1] = {0, };
	char *ifname;
	int rv, res = count;
	struct bonding *bond;

	sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
	ifname = command + 1;
	if ((strlen(command) <= 1) ||
	    !dev_valid_name(ifname))
		goto err_no_cmd;

	if (command[0] == '+') {
		printk(KERN_INFO DRV_NAME
			": %s is being created...\n", ifname);
		rv = bond_create(ifname, &bonding_defaults);
		if (rv) {
			printk(KERN_INFO DRV_NAME ": Bond creation failed.\n");
			res = rv;
		}
		goto out;
	}

	if (command[0] == '-') {
		rtnl_lock();
		down_write(&bonding_rwsem);

		list_for_each_entry(bond, &bond_dev_list, bond_list)
			if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
				/* check the ref count on the bond's kobject.
				 * If it's > expected, then there's a file open,
				 * and we have to fail.
				 */
				if (atomic_read(&bond->dev->dev.kobj.kref.refcount)
							> expected_refcount){
					printk(KERN_INFO DRV_NAME
						": Unable remove bond %s due to open references.\n",
						ifname);
					res = -EPERM;
					goto out_unlock;
				}
				printk(KERN_INFO DRV_NAME
					": %s is being deleted...\n",
					bond->dev->name);
				bond_destroy(bond);
				goto out_unlock;
			}

		printk(KERN_ERR DRV_NAME
			": unable to delete non-existent bond %s\n", ifname);
		res = -ENODEV;
		goto out_unlock;
	}

err_no_cmd:
	printk(KERN_ERR DRV_NAME
		": no command found in bonding_masters. Use +ifname or -ifname.\n");
	return -EPERM;

out_unlock:
	up_write(&bonding_rwsem);
	rtnl_unlock();

	/* Always return either count or an error.  If you return 0, you'll
	 * get called forever, which is bad.
	 */
out:
	return res;
}
/* class attribute for bond_masters file.  This ends up in /sys/class/net */
static CLASS_ATTR(bonding_masters,  S_IWUSR | S_IRUGO,
		  bonding_show_bonds, bonding_store_bonds);

int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave)
{
	char linkname[IFNAMSIZ+7];
	int ret = 0;

	/* first, create a link from the slave back to the master */
	ret = sysfs_create_link(&(slave->dev.kobj), &(master->dev.kobj),
				"master");
	if (ret)
		return ret;
	/* next, create a link from the master to the slave */
	sprintf(linkname,"slave_%s",slave->name);
	ret = sysfs_create_link(&(master->dev.kobj), &(slave->dev.kobj),
				linkname);
	return ret;