net/batman-adv/debugfs.c - kernel/msm-4.9 - Gitiles

 /* Copyright (C) 2010-2015 B.A.T.M.A.N. contributors:
  *
  * Marek Lindner
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
  * License as published by the Free Software Foundation.
  *
  * 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, see <http://www.gnu.org/licenses/>.
  */

 #include "debugfs.h"
 #include "main.h"

 #include <linux/compiler.h>
 #include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/errno.h>
 #include <linux/export.h>
 #include <linux/fcntl.h>
 #include <linux/fs.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/poll.h>
 #include <linux/printk.h>
 #include <linux/sched.h> /* for linux/wait.h */
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/stat.h>
 #include <linux/stddef.h>
 #include <linux/stringify.h>
 #include <linux/sysfs.h>
 #include <linux/types.h>
 #include <linux/uaccess.h>
 #include <linux/wait.h>
 #include <stdarg.h>

 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
 #include "gateway_client.h"
 #include "icmp_socket.h"
 #include "network-coding.h"
 #include "originator.h"
 #include "translation-table.h"

 static struct dentry *batadv_debugfs;

 #ifdef CONFIG_BATMAN_ADV_DEBUG
 #define BATADV_LOG_BUFF_MASK (batadv_log_buff_len - 1)

 static const int batadv_log_buff_len = BATADV_LOG_BUF_LEN;

 static char *batadv_log_char_addr(struct batadv_priv_debug_log *debug_log,
 				  size_t idx)
 {
 	return &debug_log->log_buff[idx & BATADV_LOG_BUFF_MASK];
 }

 static void batadv_emit_log_char(struct batadv_priv_debug_log *debug_log,
 				 char c)
 {
 	char *char_addr;

 	char_addr = batadv_log_char_addr(debug_log, debug_log->log_end);
 	*char_addr = c;
 	debug_log->log_end++;

 	if (debug_log->log_end - debug_log->log_start > batadv_log_buff_len)
 		debug_log->log_start = debug_log->log_end - batadv_log_buff_len;
 }

 __printf(2, 3)
 static int batadv_fdebug_log(struct batadv_priv_debug_log *debug_log,
 			     const char *fmt, ...)
 {
 	va_list args;
 	static char debug_log_buf[256];
 	char *p;

 	if (!debug_log)
 		return 0;

 	spin_lock_bh(&debug_log->lock);
 	va_start(args, fmt);
 	vscnprintf(debug_log_buf, sizeof(debug_log_buf), fmt, args);
 	va_end(args);

 	for (p = debug_log_buf; *p != 0; p++)
 		batadv_emit_log_char(debug_log, *p);

 	spin_unlock_bh(&debug_log->lock);

 	wake_up(&debug_log->queue_wait);

 	return 0;
 }

 int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
 {
 	va_list args;
 	char tmp_log_buf[256];

 	va_start(args, fmt);
 	vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
 	batadv_fdebug_log(bat_priv->debug_log, "[%10u] %s",
 			  jiffies_to_msecs(jiffies), tmp_log_buf);
 	va_end(args);

 	return 0;
 }

 static int batadv_log_open(struct inode *inode, struct file *file)
 {
 	if (!try_module_get(THIS_MODULE))
 		return -EBUSY;

 	nonseekable_open(inode, file);
 	file->private_data = inode->i_private;
 	return 0;
 }

 static int batadv_log_release(struct inode *inode, struct file *file)
 {
 	module_put(THIS_MODULE);
 	return 0;
 }

 static int batadv_log_empty(struct batadv_priv_debug_log *debug_log)
 {
 	return !(debug_log->log_start - debug_log->log_end);
 }

 static ssize_t batadv_log_read(struct file *file, char __user *buf,
 			       size_t count, loff_t *ppos)
 {
 	struct batadv_priv *bat_priv = file->private_data;
 	struct batadv_priv_debug_log *debug_log = bat_priv->debug_log;
 	int error, i = 0;
 	char *char_addr;
 	char c;

 	if ((file->f_flags & O_NONBLOCK) && batadv_log_empty(debug_log))
 		return -EAGAIN;

 	if (!buf)
 		return -EINVAL;

 	if (count == 0)
 		return 0;

 	if (!access_ok(VERIFY_WRITE, buf, count))
 		return -EFAULT;

 	error = wait_event_interruptible(debug_log->queue_wait,
 					 (!batadv_log_empty(debug_log)));

 	if (error)
 		return error;

 	spin_lock_bh(&debug_log->lock);

 	while ((!error) && (i < count) &&
 	       (debug_log->log_start != debug_log->log_end)) {
 		char_addr = batadv_log_char_addr(debug_log,
 						 debug_log->log_start);
 		c = *char_addr;

 		debug_log->log_start++;

 		spin_unlock_bh(&debug_log->lock);

 		error = __put_user(c, buf);

 		spin_lock_bh(&debug_log->lock);

 		buf++;
 		i++;
 	}

 	spin_unlock_bh(&debug_log->lock);

 	if (!error)
 		return i;

 	return error;
 }

 static unsigned int batadv_log_poll(struct file *file, poll_table *wait)
 {
 	struct batadv_priv *bat_priv = file->private_data;
 	struct batadv_priv_debug_log *debug_log = bat_priv->debug_log;

 	poll_wait(file, &debug_log->queue_wait, wait);

 	if (!batadv_log_empty(debug_log))
 		return POLLIN | POLLRDNORM;

 	return 0;
 }

 static const struct file_operations batadv_log_fops = {
 	.open           = batadv_log_open,
 	.release        = batadv_log_release,
 	.read           = batadv_log_read,
 	.poll           = batadv_log_poll,
 	.llseek         = no_llseek,
 };

 static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
 {
 	struct dentry *d;

 	if (!bat_priv->debug_dir)
 		goto err;

 	bat_priv->debug_log = kzalloc(sizeof(*bat_priv->debug_log), GFP_ATOMIC);
 	if (!bat_priv->debug_log)
 		goto err;

 	spin_lock_init(&bat_priv->debug_log->lock);
 	init_waitqueue_head(&bat_priv->debug_log->queue_wait);

 	d = debugfs_create_file("log", S_IFREG | S_IRUSR,
 				bat_priv->debug_dir, bat_priv,
 				&batadv_log_fops);
 	if (!d)
 		goto err;

 	return 0;

 err:
 	return -ENOMEM;
 }

 static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
 {
 	kfree(bat_priv->debug_log);
 	bat_priv->debug_log = NULL;
 }
 #else /* CONFIG_BATMAN_ADV_DEBUG */
 static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
 {
 	return 0;
 }

 static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
 {
 }
 #endif

 static int batadv_algorithms_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, batadv_algo_seq_print_text, NULL);
 }

 static int neighbors_open(struct inode *inode, struct file *file)
 {
 	struct net_device *net_dev = (struct net_device *)inode->i_private;

 	return single_open(file, batadv_hardif_neigh_seq_print_text, net_dev);
 }

 static int batadv_originators_open(struct inode *inode, struct file *file)
 {
 	struct net_device *net_dev = (struct net_device *)inode->i_private;

 	return single_open(file, batadv_orig_seq_print_text, net_dev);
 }

 /**
  * batadv_originators_hardif_open - handles debugfs output for the
  *  originator table of an hard interface
  * @inode: inode pointer to debugfs file
  * @file: pointer to the seq_file
  */
 static int batadv_originators_hardif_open(struct inode *inode,
 					  struct file *file)
 {
 	struct net_device *net_dev = (struct net_device *)inode->i_private;

 	return single_open(file, batadv_orig_hardif_seq_print_text, net_dev);
 }

 static int batadv_gateways_open(struct inode *inode, struct file *file)
 {
 	struct net_device *net_dev = (struct net_device *)inode->i_private;

 	return single_open(file, batadv_gw_client_seq_print_text, net_dev);
 }

 static int batadv_transtable_global_open(struct inode *inode, struct file *file)
 {
 	struct net_device *net_dev = (struct net_device *)inode->i_private;

 	return single_open(file, batadv_tt_global_seq_print_text, net_dev);
 }

 #ifdef CONFIG_BATMAN_ADV_BLA
 static int batadv_bla_claim_table_open(struct inode *inode, struct file *file)
 {
 	struct net_device *net_dev = (struct net_device *)inode->i_private;

 	return single_open(file, batadv_bla_claim_table_seq_print_text,
 			   net_dev);
 }

 static int batadv_bla_backbone_table_open(struct inode *inode,
 					  struct file *file)
 {
 	struct net_device *net_dev = (struct net_device *)inode->i_private;

 	return single_open(file, batadv_bla_backbone_table_seq_print_text,
 			   net_dev);
 }

 #endif

 #ifdef CONFIG_BATMAN_ADV_DAT
 /**
  * batadv_dat_cache_open - Prepare file handler for reads from dat_chache
  * @inode: inode which was opened
  * @file: file handle to be initialized
  */
 static int batadv_dat_cache_open(struct inode *inode, struct file *file)
 {
 	struct net_device *net_dev = (struct net_device *)inode->i_private;

 	return single_open(file, batadv_dat_cache_seq_print_text, net_dev);
 }
 #endif

 static int batadv_transtable_local_open(struct inode *inode, struct file *file)
 {
 	struct net_device *net_dev = (struct net_device *)inode->i_private;

 	return single_open(file, batadv_tt_local_seq_print_text, net_dev);
 }

 struct batadv_debuginfo {
 	struct attribute attr;
 	const struct file_operations fops;
 };

 #ifdef CONFIG_BATMAN_ADV_NC
 static int batadv_nc_nodes_open(struct inode *inode, struct file *file)
 {
 	struct net_device *net_dev = (struct net_device *)inode->i_private;

 	return single_open(file, batadv_nc_nodes_seq_print_text, net_dev);
 }
 #endif

 #define BATADV_DEBUGINFO(_name, _mode, _open)		\
 struct batadv_debuginfo batadv_debuginfo_##_name = {	\
 	.attr = { .name = __stringify(_name),		\
 		  .mode = _mode, },			\
 	.fops = { .owner = THIS_MODULE,			\
 		  .open = _open,			\
 		  .read	= seq_read,			\
 		  .llseek = seq_lseek,			\
 		  .release = single_release,		\
 		}					\
 }

 /* the following attributes are general and therefore they will be directly
  * placed in the BATADV_DEBUGFS_SUBDIR subdirectory of debugfs
  */
 static BATADV_DEBUGINFO(routing_algos, S_IRUGO, batadv_algorithms_open);

 static struct batadv_debuginfo *batadv_general_debuginfos[] = {
 	&batadv_debuginfo_routing_algos,
 	NULL,
 };

 /* The following attributes are per soft interface */
 static BATADV_DEBUGINFO(neighbors, S_IRUGO, neighbors_open);
 static BATADV_DEBUGINFO(originators, S_IRUGO, batadv_originators_open);
 static BATADV_DEBUGINFO(gateways, S_IRUGO, batadv_gateways_open);
 static BATADV_DEBUGINFO(transtable_global, S_IRUGO,
 			batadv_transtable_global_open);
 #ifdef CONFIG_BATMAN_ADV_BLA
 static BATADV_DEBUGINFO(bla_claim_table, S_IRUGO, batadv_bla_claim_table_open);
 static BATADV_DEBUGINFO(bla_backbone_table, S_IRUGO,
 			batadv_bla_backbone_table_open);
 #endif
 #ifdef CONFIG_BATMAN_ADV_DAT
 static BATADV_DEBUGINFO(dat_cache, S_IRUGO, batadv_dat_cache_open);
 #endif
 static BATADV_DEBUGINFO(transtable_local, S_IRUGO,
 			batadv_transtable_local_open);
 #ifdef CONFIG_BATMAN_ADV_NC
 static BATADV_DEBUGINFO(nc_nodes, S_IRUGO, batadv_nc_nodes_open);
 #endif

 static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
 	&batadv_debuginfo_neighbors,
 	&batadv_debuginfo_originators,
 	&batadv_debuginfo_gateways,
 	&batadv_debuginfo_transtable_global,
 #ifdef CONFIG_BATMAN_ADV_BLA
 	&batadv_debuginfo_bla_claim_table,
 	&batadv_debuginfo_bla_backbone_table,
 #endif
 #ifdef CONFIG_BATMAN_ADV_DAT
 	&batadv_debuginfo_dat_cache,
 #endif
 	&batadv_debuginfo_transtable_local,
 #ifdef CONFIG_BATMAN_ADV_NC
 	&batadv_debuginfo_nc_nodes,
 #endif
 	NULL,
 };

 #define BATADV_HARDIF_DEBUGINFO(_name, _mode, _open)		\
 struct batadv_debuginfo batadv_hardif_debuginfo_##_name = {	\
 	.attr = {						\
 		.name = __stringify(_name),			\
 		.mode = _mode,					\
 	},							\
 	.fops = {						\
 		.owner = THIS_MODULE,				\
 		.open = _open,					\
 		.read	= seq_read,				\
 		.llseek = seq_lseek,				\
 		.release = single_release,			\
 	},							\
 }

 static BATADV_HARDIF_DEBUGINFO(originators, S_IRUGO,
 			       batadv_originators_hardif_open);

 static struct batadv_debuginfo *batadv_hardif_debuginfos[] = {
 	&batadv_hardif_debuginfo_originators,
 	NULL,
 };

 void batadv_debugfs_init(void)
 {
 	struct batadv_debuginfo **bat_debug;
 	struct dentry *file;

 	batadv_debugfs = debugfs_create_dir(BATADV_DEBUGFS_SUBDIR, NULL);
 	if (batadv_debugfs == ERR_PTR(-ENODEV))
 		batadv_debugfs = NULL;

 	if (!batadv_debugfs)
 		goto err;

 	for (bat_debug = batadv_general_debuginfos; *bat_debug; ++bat_debug) {
 		file = debugfs_create_file(((*bat_debug)->attr).name,
 					   S_IFREG | ((*bat_debug)->attr).mode,
 					   batadv_debugfs, NULL,
 					   &(*bat_debug)->fops);
 		if (!file) {
 			pr_err("Can't add general debugfs file: %s\n",
 			       ((*bat_debug)->attr).name);
 			goto err;
 		}
 	}

 	return;
 err:
 	debugfs_remove_recursive(batadv_debugfs);
 	batadv_debugfs = NULL;
 }

 void batadv_debugfs_destroy(void)
 {
 	debugfs_remove_recursive(batadv_debugfs);
 	batadv_debugfs = NULL;
 }

 /**
  * batadv_debugfs_add_hardif - creates the base directory for a hard interface
  *  in debugfs.
  * @hard_iface: hard interface which should be added.
  */
 int batadv_debugfs_add_hardif(struct batadv_hard_iface *hard_iface)
 {
 	struct batadv_debuginfo **bat_debug;
 	struct dentry *file;

 	if (!batadv_debugfs)
 		goto out;

 	hard_iface->debug_dir = debugfs_create_dir(hard_iface->net_dev->name,
 						   batadv_debugfs);
 	if (!hard_iface->debug_dir)
 		goto out;

 	for (bat_debug = batadv_hardif_debuginfos; *bat_debug; ++bat_debug) {
 		file = debugfs_create_file(((*bat_debug)->attr).name,
 					   S_IFREG | ((*bat_debug)->attr).mode,
 					   hard_iface->debug_dir,
 					   hard_iface->net_dev,
 					   &(*bat_debug)->fops);
 		if (!file)
 			goto rem_attr;
 	}

 	return 0;
 rem_attr:
 	debugfs_remove_recursive(hard_iface->debug_dir);
 	hard_iface->debug_dir = NULL;
 out:
 	return -ENOMEM;
 }

 /**
  * batadv_debugfs_del_hardif - delete the base directory for a hard interface
  *  in debugfs.
  * @hard_iface: hard interface which is deleted.
  */
 void batadv_debugfs_del_hardif(struct batadv_hard_iface *hard_iface)
 {
 	if (batadv_debugfs) {
 		debugfs_remove_recursive(hard_iface->debug_dir);
 		hard_iface->debug_dir = NULL;
 	}
 }

 int batadv_debugfs_add_meshif(struct net_device *dev)
 {
 	struct batadv_priv *bat_priv = netdev_priv(dev);
 	struct batadv_debuginfo **bat_debug;
 	struct dentry *file;

 	if (!batadv_debugfs)
 		goto out;

 	bat_priv->debug_dir = debugfs_create_dir(dev->name, batadv_debugfs);
 	if (!bat_priv->debug_dir)
 		goto out;

 	if (batadv_socket_setup(bat_priv) < 0)
 		goto rem_attr;

 	if (batadv_debug_log_setup(bat_priv) < 0)
 		goto rem_attr;

 	for (bat_debug = batadv_mesh_debuginfos; *bat_debug; ++bat_debug) {
 		file = debugfs_create_file(((*bat_debug)->attr).name,
 					   S_IFREG | ((*bat_debug)->attr).mode,
 					   bat_priv->debug_dir,
 					   dev, &(*bat_debug)->fops);
 		if (!file) {
 			batadv_err(dev, "Can't add debugfs file: %s/%s\n",
 				   dev->name, ((*bat_debug)->attr).name);
 			goto rem_attr;
 		}
 	}

 	if (batadv_nc_init_debugfs(bat_priv) < 0)
 		goto rem_attr;

 	return 0;
 rem_attr:
 	debugfs_remove_recursive(bat_priv->debug_dir);
 	bat_priv->debug_dir = NULL;
 out:
 	return -ENOMEM;
 }

 void batadv_debugfs_del_meshif(struct net_device *dev)
 {
 	struct batadv_priv *bat_priv = netdev_priv(dev);

 	batadv_debug_log_cleanup(bat_priv);

 	if (batadv_debugfs) {
 		debugfs_remove_recursive(bat_priv->debug_dir);
 		bat_priv->debug_dir = NULL;
 	}
 }
	/* Copyright (C) 2010-2015 B.A.T.M.A.N. contributors:
	*
	* Marek Lindner
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of version 2 of the GNU General Public
	* License as published by the Free Software Foundation.
	*
	* 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, see <http://www.gnu.org/licenses/>.
	*/

	#include "debugfs.h"
	#include "main.h"

	#include <linux/compiler.h>
	#include <linux/debugfs.h>
	#include <linux/device.h>
	#include <linux/errno.h>
	#include <linux/export.h>
	#include <linux/fcntl.h>
	#include <linux/fs.h>
	#include <linux/jiffies.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/netdevice.h>
	#include <linux/poll.h>
	#include <linux/printk.h>
	#include <linux/sched.h> /* for linux/wait.h */
	#include <linux/seq_file.h>
	#include <linux/slab.h>
	#include <linux/spinlock.h>
	#include <linux/stat.h>
	#include <linux/stddef.h>
	#include <linux/stringify.h>
	#include <linux/sysfs.h>
	#include <linux/types.h>
	#include <linux/uaccess.h>
	#include <linux/wait.h>
	#include <stdarg.h>

	#include "bridge_loop_avoidance.h"
	#include "distributed-arp-table.h"
	#include "gateway_client.h"
	#include "icmp_socket.h"
	#include "network-coding.h"
	#include "originator.h"
	#include "translation-table.h"

	static struct dentry *batadv_debugfs;

	#ifdef CONFIG_BATMAN_ADV_DEBUG
	#define BATADV_LOG_BUFF_MASK (batadv_log_buff_len - 1)

	static const int batadv_log_buff_len = BATADV_LOG_BUF_LEN;

	static char batadv_log_char_addr(struct batadv_priv_debug_log debug_log,
	size_t idx)
	{
	return &debug_log->log_buff[idx & BATADV_LOG_BUFF_MASK];
	}

	static void batadv_emit_log_char(struct batadv_priv_debug_log *debug_log,
	char c)
	{
	char *char_addr;

	char_addr = batadv_log_char_addr(debug_log, debug_log->log_end);
	*char_addr = c;
	debug_log->log_end++;

	if (debug_log->log_end - debug_log->log_start > batadv_log_buff_len)
	debug_log->log_start = debug_log->log_end - batadv_log_buff_len;
	}

	__printf(2, 3)
	static int batadv_fdebug_log(struct batadv_priv_debug_log *debug_log,
	const char *fmt, ...)
	{
	va_list args;
	static char debug_log_buf[256];
	char *p;

	if (!debug_log)
	return 0;

	spin_lock_bh(&debug_log->lock);
	va_start(args, fmt);
	vscnprintf(debug_log_buf, sizeof(debug_log_buf), fmt, args);
	va_end(args);

	for (p = debug_log_buf; *p != 0; p++)
	batadv_emit_log_char(debug_log, *p);

	spin_unlock_bh(&debug_log->lock);

	wake_up(&debug_log->queue_wait);

	return 0;
	}

	int batadv_debug_log(struct batadv_priv bat_priv, const char fmt, ...)
	{
	va_list args;
	char tmp_log_buf[256];

	va_start(args, fmt);
	vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
	batadv_fdebug_log(bat_priv->debug_log, "[%10u] %s",
	jiffies_to_msecs(jiffies), tmp_log_buf);
	va_end(args);

	return 0;
	}

	static int batadv_log_open(struct inode inode, struct file file)
	{
	if (!try_module_get(THIS_MODULE))
	return -EBUSY;

	nonseekable_open(inode, file);
	file->private_data = inode->i_private;
	return 0;
	}

	static int batadv_log_release(struct inode inode, struct file file)
	{
	module_put(THIS_MODULE);
	return 0;
	}

	static int batadv_log_empty(struct batadv_priv_debug_log *debug_log)
	{
	return !(debug_log->log_start - debug_log->log_end);
	}

	static ssize_t batadv_log_read(struct file file, char __user buf,
	size_t count, loff_t *ppos)
	{
	struct batadv_priv *bat_priv = file->private_data;
	struct batadv_priv_debug_log *debug_log = bat_priv->debug_log;
	int error, i = 0;
	char *char_addr;
	char c;

	if ((file->f_flags & O_NONBLOCK) && batadv_log_empty(debug_log))
	return -EAGAIN;

	if (!buf)
	return -EINVAL;

	if (count == 0)
	return 0;

	if (!access_ok(VERIFY_WRITE, buf, count))
	return -EFAULT;

	error = wait_event_interruptible(debug_log->queue_wait,
	(!batadv_log_empty(debug_log)));

	if (error)
	return error;

	spin_lock_bh(&debug_log->lock);

	while ((!error) && (i < count) &&
	(debug_log->log_start != debug_log->log_end)) {
	char_addr = batadv_log_char_addr(debug_log,
	debug_log->log_start);
	c = *char_addr;

	debug_log->log_start++;

	spin_unlock_bh(&debug_log->lock);

	error = __put_user(c, buf);

	spin_lock_bh(&debug_log->lock);

	buf++;
	i++;
	}

	spin_unlock_bh(&debug_log->lock);

	if (!error)
	return i;

	return error;
	}

	static unsigned int batadv_log_poll(struct file file, poll_table wait)
	{
	struct batadv_priv *bat_priv = file->private_data;
	struct batadv_priv_debug_log *debug_log = bat_priv->debug_log;

	poll_wait(file, &debug_log->queue_wait, wait);

	if (!batadv_log_empty(debug_log))
	return POLLIN \| POLLRDNORM;

	return 0;
	}

	static const struct file_operations batadv_log_fops = {
	.open = batadv_log_open,
	.release = batadv_log_release,
	.read = batadv_log_read,
	.poll = batadv_log_poll,
	.llseek = no_llseek,
	};

	static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
	{
	struct dentry *d;

	if (!bat_priv->debug_dir)
	goto err;

	bat_priv->debug_log = kzalloc(sizeof(*bat_priv->debug_log), GFP_ATOMIC);
	if (!bat_priv->debug_log)
	goto err;

	spin_lock_init(&bat_priv->debug_log->lock);
	init_waitqueue_head(&bat_priv->debug_log->queue_wait);

	d = debugfs_create_file("log", S_IFREG \| S_IRUSR,
	bat_priv->debug_dir, bat_priv,
	&batadv_log_fops);
	if (!d)
	goto err;

	return 0;

	err:
	return -ENOMEM;
	}

	static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
	{
	kfree(bat_priv->debug_log);
	bat_priv->debug_log = NULL;
	}
	#else /* CONFIG_BATMAN_ADV_DEBUG */
	static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
	{
	return 0;
	}

	static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
	{
	}
	#endif

	static int batadv_algorithms_open(struct inode inode, struct file file)
	{
	return single_open(file, batadv_algo_seq_print_text, NULL);
	}

	static int neighbors_open(struct inode inode, struct file file)
	{
	struct net_device net_dev = (struct net_device )inode->i_private;

	return single_open(file, batadv_hardif_neigh_seq_print_text, net_dev);
	}

	static int batadv_originators_open(struct inode inode, struct file file)
	{
	struct net_device net_dev = (struct net_device )inode->i_private;

	return single_open(file, batadv_orig_seq_print_text, net_dev);
	}

	/**
	* batadv_originators_hardif_open - handles debugfs output for the
	* originator table of an hard interface
	* @inode: inode pointer to debugfs file
	* @file: pointer to the seq_file
	*/
	static int batadv_originators_hardif_open(struct inode *inode,
	struct file *file)
	{
	struct net_device net_dev = (struct net_device )inode->i_private;

	return single_open(file, batadv_orig_hardif_seq_print_text, net_dev);
	}

	static int batadv_gateways_open(struct inode inode, struct file file)
	{
	struct net_device net_dev = (struct net_device )inode->i_private;

	return single_open(file, batadv_gw_client_seq_print_text, net_dev);
	}

	static int batadv_transtable_global_open(struct inode inode, struct file file)
	{
	struct net_device net_dev = (struct net_device )inode->i_private;

	return single_open(file, batadv_tt_global_seq_print_text, net_dev);
	}

	#ifdef CONFIG_BATMAN_ADV_BLA
	static int batadv_bla_claim_table_open(struct inode inode, struct file file)
	{
	struct net_device net_dev = (struct net_device )inode->i_private;

	return single_open(file, batadv_bla_claim_table_seq_print_text,
	net_dev);
	}

	static int batadv_bla_backbone_table_open(struct inode *inode,
	struct file *file)
	{
	struct net_device net_dev = (struct net_device )inode->i_private;

	return single_open(file, batadv_bla_backbone_table_seq_print_text,
	net_dev);
	}

	#endif

	#ifdef CONFIG_BATMAN_ADV_DAT
	/**
	* batadv_dat_cache_open - Prepare file handler for reads from dat_chache
	* @inode: inode which was opened
	* @file: file handle to be initialized
	*/
	static int batadv_dat_cache_open(struct inode inode, struct file file)
	{
	struct net_device net_dev = (struct net_device )inode->i_private;

	return single_open(file, batadv_dat_cache_seq_print_text, net_dev);
	}
	#endif

	static int batadv_transtable_local_open(struct inode inode, struct file file)
	{
	struct net_device net_dev = (struct net_device )inode->i_private;

	return single_open(file, batadv_tt_local_seq_print_text, net_dev);
	}

	struct batadv_debuginfo {
	struct attribute attr;
	const struct file_operations fops;
	};

	#ifdef CONFIG_BATMAN_ADV_NC
	static int batadv_nc_nodes_open(struct inode inode, struct file file)
	{
	struct net_device net_dev = (struct net_device )inode->i_private;

	return single_open(file, batadv_nc_nodes_seq_print_text, net_dev);
	}
	#endif

	#define BATADV_DEBUGINFO(_name, _mode, _open) \
	struct batadv_debuginfo batadv_debuginfo_##_name = { \
	.attr = { .name = __stringify(_name), \
	.mode = _mode, }, \
	.fops = { .owner = THIS_MODULE, \
	.open = _open, \
	.read = seq_read, \
	.llseek = seq_lseek, \
	.release = single_release, \
	} \
	}

	/* the following attributes are general and therefore they will be directly
	* placed in the BATADV_DEBUGFS_SUBDIR subdirectory of debugfs
	*/
	static BATADV_DEBUGINFO(routing_algos, S_IRUGO, batadv_algorithms_open);

	static struct batadv_debuginfo *batadv_general_debuginfos[] = {
	&batadv_debuginfo_routing_algos,
	NULL,
	};

	/* The following attributes are per soft interface */
	static BATADV_DEBUGINFO(neighbors, S_IRUGO, neighbors_open);
	static BATADV_DEBUGINFO(originators, S_IRUGO, batadv_originators_open);
	static BATADV_DEBUGINFO(gateways, S_IRUGO, batadv_gateways_open);
	static BATADV_DEBUGINFO(transtable_global, S_IRUGO,
	batadv_transtable_global_open);
	#ifdef CONFIG_BATMAN_ADV_BLA
	static BATADV_DEBUGINFO(bla_claim_table, S_IRUGO, batadv_bla_claim_table_open);
	static BATADV_DEBUGINFO(bla_backbone_table, S_IRUGO,
	batadv_bla_backbone_table_open);
	#endif
	#ifdef CONFIG_BATMAN_ADV_DAT
	static BATADV_DEBUGINFO(dat_cache, S_IRUGO, batadv_dat_cache_open);
	#endif
	static BATADV_DEBUGINFO(transtable_local, S_IRUGO,
	batadv_transtable_local_open);
	#ifdef CONFIG_BATMAN_ADV_NC
	static BATADV_DEBUGINFO(nc_nodes, S_IRUGO, batadv_nc_nodes_open);
	#endif

	static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
	&batadv_debuginfo_neighbors,
	&batadv_debuginfo_originators,
	&batadv_debuginfo_gateways,
	&batadv_debuginfo_transtable_global,
	#ifdef CONFIG_BATMAN_ADV_BLA
	&batadv_debuginfo_bla_claim_table,
	&batadv_debuginfo_bla_backbone_table,
	#endif
	#ifdef CONFIG_BATMAN_ADV_DAT
	&batadv_debuginfo_dat_cache,
	#endif
	&batadv_debuginfo_transtable_local,
	#ifdef CONFIG_BATMAN_ADV_NC
	&batadv_debuginfo_nc_nodes,
	#endif
	NULL,
	};

	#define BATADV_HARDIF_DEBUGINFO(_name, _mode, _open) \
	struct batadv_debuginfo batadv_hardif_debuginfo_##_name = { \
	.attr = { \
	.name = __stringify(_name), \
	.mode = _mode, \
	}, \
	.fops = { \
	.owner = THIS_MODULE, \
	.open = _open, \
	.read = seq_read, \
	.llseek = seq_lseek, \
	.release = single_release, \
	}, \
	}

	static BATADV_HARDIF_DEBUGINFO(originators, S_IRUGO,
	batadv_originators_hardif_open);

	static struct batadv_debuginfo *batadv_hardif_debuginfos[] = {
	&batadv_hardif_debuginfo_originators,
	NULL,
	};

	void batadv_debugfs_init(void)
	{
	struct batadv_debuginfo **bat_debug;
	struct dentry *file;

	batadv_debugfs = debugfs_create_dir(BATADV_DEBUGFS_SUBDIR, NULL);
	if (batadv_debugfs == ERR_PTR(-ENODEV))
	batadv_debugfs = NULL;

	if (!batadv_debugfs)
	goto err;

	for (bat_debug = batadv_general_debuginfos; *bat_debug; ++bat_debug) {
	file = debugfs_create_file(((*bat_debug)->attr).name,
	S_IFREG \| ((*bat_debug)->attr).mode,
	batadv_debugfs, NULL,
	&(*bat_debug)->fops);
	if (!file) {
	pr_err("Can't add general debugfs file: %s\n",
	((*bat_debug)->attr).name);
	goto err;
	}
	}

	return;
	err:
	debugfs_remove_recursive(batadv_debugfs);
	batadv_debugfs = NULL;
	}

	void batadv_debugfs_destroy(void)
	{
	debugfs_remove_recursive(batadv_debugfs);
	batadv_debugfs = NULL;
	}

	/**
	* batadv_debugfs_add_hardif - creates the base directory for a hard interface
	* in debugfs.
	* @hard_iface: hard interface which should be added.
	*/
	int batadv_debugfs_add_hardif(struct batadv_hard_iface *hard_iface)
	{
	struct batadv_debuginfo **bat_debug;
	struct dentry *file;

	if (!batadv_debugfs)
	goto out;

	hard_iface->debug_dir = debugfs_create_dir(hard_iface->net_dev->name,
	batadv_debugfs);
	if (!hard_iface->debug_dir)
	goto out;

	for (bat_debug = batadv_hardif_debuginfos; *bat_debug; ++bat_debug) {
	file = debugfs_create_file(((*bat_debug)->attr).name,
	S_IFREG \| ((*bat_debug)->attr).mode,
	hard_iface->debug_dir,
	hard_iface->net_dev,
	&(*bat_debug)->fops);
	if (!file)
	goto rem_attr;
	}

	return 0;
	rem_attr:
	debugfs_remove_recursive(hard_iface->debug_dir);
	hard_iface->debug_dir = NULL;
	out:
	return -ENOMEM;
	}

	/**
	* batadv_debugfs_del_hardif - delete the base directory for a hard interface
	* in debugfs.
	* @hard_iface: hard interface which is deleted.
	*/
	void batadv_debugfs_del_hardif(struct batadv_hard_iface *hard_iface)
	{
	if (batadv_debugfs) {
	debugfs_remove_recursive(hard_iface->debug_dir);
	hard_iface->debug_dir = NULL;
	}
	}

	int batadv_debugfs_add_meshif(struct net_device *dev)
	{
	struct batadv_priv *bat_priv = netdev_priv(dev);
	struct batadv_debuginfo **bat_debug;
	struct dentry *file;

	if (!batadv_debugfs)
	goto out;

	bat_priv->debug_dir = debugfs_create_dir(dev->name, batadv_debugfs);
	if (!bat_priv->debug_dir)
	goto out;

	if (batadv_socket_setup(bat_priv) < 0)
	goto rem_attr;

	if (batadv_debug_log_setup(bat_priv) < 0)
	goto rem_attr;

	for (bat_debug = batadv_mesh_debuginfos; *bat_debug; ++bat_debug) {
	file = debugfs_create_file(((*bat_debug)->attr).name,
	S_IFREG \| ((*bat_debug)->attr).mode,
	bat_priv->debug_dir,
	dev, &(*bat_debug)->fops);
	if (!file) {
	batadv_err(dev, "Can't add debugfs file: %s/%s\n",
	dev->name, ((*bat_debug)->attr).name);
	goto rem_attr;
	}
	}

	if (batadv_nc_init_debugfs(bat_priv) < 0)
	goto rem_attr;

	return 0;
	rem_attr:
	debugfs_remove_recursive(bat_priv->debug_dir);
	bat_priv->debug_dir = NULL;
	out:
	return -ENOMEM;
	}

	void batadv_debugfs_del_meshif(struct net_device *dev)
	{
	struct batadv_priv *bat_priv = netdev_priv(dev);

	batadv_debug_log_cleanup(bat_priv);

	if (batadv_debugfs) {
	debugfs_remove_recursive(bat_priv->debug_dir);
	bat_priv->debug_dir = NULL;
	}
	}