/*
   *  linux/fs/proc/base.c
   *
   *  Copyright (C) 1991, 1992 Linus Torvalds
   *
   *  proc base directory handling functions
   *
   *  1999, Al Viro. Rewritten. Now it covers the whole per-process part.
   *  Instead of using magical inumbers to determine the kind of object
   *  we allocate and fill in-core inodes upon lookup. They don't even
   *  go into icache. We cache the reference to task_struct upon lookup too.
   *  Eventually it should become a filesystem in its own. We don't use the
   *  rest of procfs anymore.

   *
   *
   *  Changelog:
   *  17-Jan-2005
   *  Allan Bezerra
   *  Bruna Moreira <bruna.moreira@indt.org.br>
   *  Edjard Mota <edjard.mota@indt.org.br>
   *  Ilias Biris <ilias.biris@indt.org.br>
   *  Mauricio Lin <mauricio.lin@indt.org.br>
   *
   *  Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
   *
   *  A new process specific entry (smaps) included in /proc. It shows the
   *  size of rss for each memory area. The maps entry lacks information
   *  about physical memory size (rss) for each mapped file, i.e.,
   *  rss information for executables and library files.
   *  This additional information is useful for any tools that need to know
   *  about physical memory consumption for a process specific library.
   *
   *  Changelog:
   *  21-Feb-2005
   *  Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
   *  Pud inclusion in the page table walking.
   *
   *  ChangeLog:
   *  10-Mar-2005
   *  10LE Instituto Nokia de Tecnologia - INdT:
   *  A better way to walks through the page table as suggested by Hugh Dickins.
   *
   *  Simo Piiroinen <simo.piiroinen@nokia.com>:
   *  Smaps information related to shared, private, clean and dirty pages.
   *
   *  Paul Mundt <paul.mundt@nokia.com>:
   *  Overall revision about smaps.

   */
  
  #include <asm/uaccess.h>

  #include <linux/errno.h>
  #include <linux/time.h>
  #include <linux/proc_fs.h>
  #include <linux/stat.h>

  #include <linux/task_io_accounting_ops.h>

  #include <linux/init.h>

  #include <linux/capability.h>

  #include <linux/file.h>

  #include <linux/fdtable.h>

  #include <linux/string.h>
  #include <linux/seq_file.h>
  #include <linux/namei.h>

  #include <linux/mnt_namespace.h>

  #include <linux/mm.h>

  #include <linux/rcupdate.h>

  #include <linux/kallsyms.h>

  #include <linux/resource.h>

  #include <linux/module.h>

  #include <linux/mount.h>
  #include <linux/security.h>
  #include <linux/ptrace.h>

  #include <linux/tracehook.h>

  #include <linux/cgroup.h>

  #include <linux/cpuset.h>
  #include <linux/audit.h>

  #include <linux/poll.h>

  #include <linux/nsproxy.h>

  #include <linux/oom.h>

  #include <linux/elf.h>

  #include <linux/pid_namespace.h>

  #include "internal.h"

  /* NOTE:
   *	Implementing inode permission operations in /proc is almost
   *	certainly an error.  Permission checks need to happen during
   *	each system call not at open time.  The reason is that most of
   *	what we wish to check for permissions in /proc varies at runtime.
   *
   *	The classic example of a problem is opening file descriptors
   *	in /proc for a task before it execs a suid executable.
   */

  struct pid_entry {

  	char *name;

  	int len;

  	mode_t mode;

  	const struct inode_operations *iop;

  	const struct file_operations *fop;

  	union proc_op op;

  };

  #define NOD(NAME, MODE, IOP, FOP, OP) {			\

  	.name = (NAME),					\

  	.len  = sizeof(NAME) - 1,			\

  	.mode = MODE,					\
  	.iop  = IOP,					\
  	.fop  = FOP,					\
  	.op   = OP,					\
  }

  #define DIR(NAME, MODE, OTYPE)							\
  	NOD(NAME, (S_IFDIR|(MODE)),						\

  		&proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations,	\
  		{} )

  #define LNK(NAME, OTYPE)					\
  	NOD(NAME, (S_IFLNK|S_IRWXUGO),				\

  		&proc_pid_link_inode_operations, NULL,		\
  		{ .proc_get_link = &proc_##OTYPE##_link } )

  #define REG(NAME, MODE, OTYPE)				\
  	NOD(NAME, (S_IFREG|(MODE)), NULL,		\

  		&proc_##OTYPE##_operations, {})

  #define INF(NAME, MODE, OTYPE)				\
  	NOD(NAME, (S_IFREG|(MODE)), 			\

  		NULL, &proc_info_file_operations,	\
  		{ .proc_read = &proc_##OTYPE } )

  #define ONE(NAME, MODE, OTYPE)				\
  	NOD(NAME, (S_IFREG|(MODE)), 			\
  		NULL, &proc_single_file_operations,	\
  		{ .proc_show = &proc_##OTYPE } )

  /*
   * Count the number of hardlinks for the pid_entry table, excluding the .
   * and .. links.
   */
  static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
  	unsigned int n)
  {
  	unsigned int i;
  	unsigned int count;
  
  	count = 0;
  	for (i = 0; i < n; ++i) {
  		if (S_ISDIR(entries[i].mode))
  			++count;
  	}
  
  	return count;
  }

  static struct fs_struct *get_fs_struct(struct task_struct *task)

  {
  	struct fs_struct *fs;

  	task_lock(task);
  	fs = task->fs;

  	if(fs)
  		atomic_inc(&fs->count);

  	task_unlock(task);
  	return fs;
  }

  static int get_nr_threads(struct task_struct *tsk)
  {

  	unsigned long flags;
  	int count = 0;
  
  	if (lock_task_sighand(tsk, &flags)) {
  		count = atomic_read(&tsk->signal->count);
  		unlock_task_sighand(tsk, &flags);
  	}
  	return count;
  }

  static int proc_cwd_link(struct inode *inode, struct path *path)

  {

  	struct task_struct *task = get_proc_task(inode);
  	struct fs_struct *fs = NULL;

  	int result = -ENOENT;

  
  	if (task) {
  		fs = get_fs_struct(task);
  		put_task_struct(task);
  	}

  	if (fs) {
  		read_lock(&fs->lock);

  		*path = fs->pwd;
  		path_get(&fs->pwd);

  		read_unlock(&fs->lock);
  		result = 0;
  		put_fs_struct(fs);
  	}
  	return result;
  }

  static int proc_root_link(struct inode *inode, struct path *path)

  {

  	struct task_struct *task = get_proc_task(inode);
  	struct fs_struct *fs = NULL;

  	int result = -ENOENT;

  
  	if (task) {
  		fs = get_fs_struct(task);
  		put_task_struct(task);
  	}

  	if (fs) {
  		read_lock(&fs->lock);

  		*path = fs->root;
  		path_get(&fs->root);

  		read_unlock(&fs->lock);
  		result = 0;
  		put_fs_struct(fs);
  	}
  	return result;
  }

  /*
   * Return zero if current may access user memory in @task, -error if not.
   */
  static int check_mem_permission(struct task_struct *task)
  {
  	/*
  	 * A task can always look at itself, in case it chooses
  	 * to use system calls instead of load instructions.
  	 */
  	if (task == current)
  		return 0;
  
  	/*
  	 * If current is actively ptrace'ing, and would also be
  	 * permitted to freshly attach with ptrace now, permit it.
  	 */

  	if (task_is_stopped_or_traced(task)) {
  		int match;
  		rcu_read_lock();
  		match = (tracehook_tracer_task(task) == current);
  		rcu_read_unlock();
  		if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
  			return 0;
  	}

  
  	/*
  	 * Noone else is allowed.
  	 */
  	return -EPERM;
  }

  struct mm_struct *mm_for_maps(struct task_struct *task)
  {
  	struct mm_struct *mm = get_task_mm(task);
  	if (!mm)
  		return NULL;
  	down_read(&mm->mmap_sem);
  	task_lock(task);
  	if (task->mm != mm)
  		goto out;

  	if (task->mm != current->mm &&
  	    __ptrace_may_access(task, PTRACE_MODE_READ) < 0)

  		goto out;
  	task_unlock(task);
  	return mm;
  out:
  	task_unlock(task);
  	up_read(&mm->mmap_sem);
  	mmput(mm);
  	return NULL;
  }

  static int proc_pid_cmdline(struct task_struct *task, char * buffer)
  {
  	int res = 0;
  	unsigned int len;
  	struct mm_struct *mm = get_task_mm(task);
  	if (!mm)
  		goto out;
  	if (!mm->arg_end)
  		goto out_mm;	/* Shh! No looking before we're done */
  
   	len = mm->arg_end - mm->arg_start;
   
  	if (len > PAGE_SIZE)
  		len = PAGE_SIZE;
   
  	res = access_process_vm(task, mm->arg_start, buffer, len, 0);
  
  	// If the nul at the end of args has been overwritten, then
  	// assume application is using setproctitle(3).
  	if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
  		len = strnlen(buffer, res);
  		if (len < res) {
  		    res = len;
  		} else {
  			len = mm->env_end - mm->env_start;
  			if (len > PAGE_SIZE - res)
  				len = PAGE_SIZE - res;
  			res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
  			res = strnlen(buffer, res);
  		}
  	}
  out_mm:
  	mmput(mm);
  out:
  	return res;
  }
  
  static int proc_pid_auxv(struct task_struct *task, char *buffer)
  {
  	int res = 0;
  	struct mm_struct *mm = get_task_mm(task);
  	if (mm) {
  		unsigned int nwords = 0;
  		do
  			nwords += 2;
  		while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
  		res = nwords * sizeof(mm->saved_auxv[0]);
  		if (res > PAGE_SIZE)
  			res = PAGE_SIZE;
  		memcpy(buffer, mm->saved_auxv, res);
  		mmput(mm);
  	}
  	return res;
  }
  
  
  #ifdef CONFIG_KALLSYMS
  /*
   * Provides a wchan file via kallsyms in a proper one-value-per-file format.
   * Returns the resolved symbol.  If that fails, simply return the address.
   */
  static int proc_pid_wchan(struct task_struct *task, char *buffer)
  {

  	unsigned long wchan;

  	char symname[KSYM_NAME_LEN];

  
  	wchan = get_wchan(task);

  	if (lookup_symbol_name(wchan, symname) < 0)
  		return sprintf(buffer, "%lu", wchan);
  	else
  		return sprintf(buffer, "%s", symname);

  }
  #endif /* CONFIG_KALLSYMS */
  
  #ifdef CONFIG_SCHEDSTATS
  /*
   * Provides /proc/PID/schedstat
   */
  static int proc_pid_schedstat(struct task_struct *task, char *buffer)
  {

  	return sprintf(buffer, "%llu %llu %lu
  ",

  			task->sched_info.cpu_time,
  			task->sched_info.run_delay,

  			task->sched_info.pcount);

  }
  #endif

  #ifdef CONFIG_LATENCYTOP
  static int lstats_show_proc(struct seq_file *m, void *v)
  {
  	int i;

  	struct inode *inode = m->private;
  	struct task_struct *task = get_proc_task(inode);

  	if (!task)
  		return -ESRCH;
  	seq_puts(m, "Latency Top version : v0.1
  ");

  	for (i = 0; i < 32; i++) {
  		if (task->latency_record[i].backtrace[0]) {
  			int q;
  			seq_printf(m, "%i %li %li ",
  				task->latency_record[i].count,
  				task->latency_record[i].time,
  				task->latency_record[i].max);
  			for (q = 0; q < LT_BACKTRACEDEPTH; q++) {

  				char sym[KSYM_SYMBOL_LEN];

  				char *c;
  				if (!task->latency_record[i].backtrace[q])
  					break;
  				if (task->latency_record[i].backtrace[q] == ULONG_MAX)
  					break;
  				sprint_symbol(sym, task->latency_record[i].backtrace[q]);
  				c = strchr(sym, '+');
  				if (c)
  					*c = 0;
  				seq_printf(m, "%s ", sym);
  			}
  			seq_printf(m, "
  ");
  		}
  
  	}

  	put_task_struct(task);

  	return 0;
  }
  
  static int lstats_open(struct inode *inode, struct file *file)
  {

  	return single_open(file, lstats_show_proc, inode);

  }

  static ssize_t lstats_write(struct file *file, const char __user *buf,
  			    size_t count, loff_t *offs)
  {

  	struct task_struct *task = get_proc_task(file->f_dentry->d_inode);

  	if (!task)
  		return -ESRCH;

  	clear_all_latency_tracing(task);

  	put_task_struct(task);

  
  	return count;
  }
  
  static const struct file_operations proc_lstats_operations = {
  	.open		= lstats_open,
  	.read		= seq_read,
  	.write		= lstats_write,
  	.llseek		= seq_lseek,

  	.release	= single_release,

  };
  
  #endif

  /* The badness from the OOM killer */
  unsigned long badness(struct task_struct *p, unsigned long uptime);
  static int proc_oom_score(struct task_struct *task, char *buffer)
  {
  	unsigned long points;
  	struct timespec uptime;
  
  	do_posix_clock_monotonic_gettime(&uptime);

  	read_lock(&tasklist_lock);

  	points = badness(task, uptime.tv_sec);

  	read_unlock(&tasklist_lock);

  	return sprintf(buffer, "%lu
  ", points);
  }

  struct limit_names {
  	char *name;
  	char *unit;
  };
  
  static const struct limit_names lnames[RLIM_NLIMITS] = {
  	[RLIMIT_CPU] = {"Max cpu time", "ms"},
  	[RLIMIT_FSIZE] = {"Max file size", "bytes"},
  	[RLIMIT_DATA] = {"Max data size", "bytes"},
  	[RLIMIT_STACK] = {"Max stack size", "bytes"},
  	[RLIMIT_CORE] = {"Max core file size", "bytes"},
  	[RLIMIT_RSS] = {"Max resident set", "bytes"},
  	[RLIMIT_NPROC] = {"Max processes", "processes"},
  	[RLIMIT_NOFILE] = {"Max open files", "files"},
  	[RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
  	[RLIMIT_AS] = {"Max address space", "bytes"},
  	[RLIMIT_LOCKS] = {"Max file locks", "locks"},
  	[RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
  	[RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
  	[RLIMIT_NICE] = {"Max nice priority", NULL},
  	[RLIMIT_RTPRIO] = {"Max realtime priority", NULL},

  	[RLIMIT_RTTIME] = {"Max realtime timeout", "us"},

  };
  
  /* Display limits for a process */
  static int proc_pid_limits(struct task_struct *task, char *buffer)
  {
  	unsigned int i;
  	int count = 0;
  	unsigned long flags;
  	char *bufptr = buffer;
  
  	struct rlimit rlim[RLIM_NLIMITS];

  	if (!lock_task_sighand(task, &flags))

  		return 0;

  	memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
  	unlock_task_sighand(task, &flags);

  
  	/*
  	 * print the file header
  	 */
  	count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s
  ",
  			"Limit", "Soft Limit", "Hard Limit", "Units");
  
  	for (i = 0; i < RLIM_NLIMITS; i++) {
  		if (rlim[i].rlim_cur == RLIM_INFINITY)
  			count += sprintf(&bufptr[count], "%-25s %-20s ",
  					 lnames[i].name, "unlimited");
  		else
  			count += sprintf(&bufptr[count], "%-25s %-20lu ",
  					 lnames[i].name, rlim[i].rlim_cur);
  
  		if (rlim[i].rlim_max == RLIM_INFINITY)
  			count += sprintf(&bufptr[count], "%-20s ", "unlimited");
  		else
  			count += sprintf(&bufptr[count], "%-20lu ",
  					 rlim[i].rlim_max);
  
  		if (lnames[i].unit)
  			count += sprintf(&bufptr[count], "%-10s
  ",
  					 lnames[i].unit);
  		else
  			count += sprintf(&bufptr[count], "
  ");
  	}
  
  	return count;
  }

  #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
  static int proc_pid_syscall(struct task_struct *task, char *buffer)
  {
  	long nr;
  	unsigned long args[6], sp, pc;
  
  	if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
  		return sprintf(buffer, "running
  ");
  
  	if (nr < 0)
  		return sprintf(buffer, "%ld 0x%lx 0x%lx
  ", nr, sp, pc);
  
  	return sprintf(buffer,
  		       "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx
  ",
  		       nr,
  		       args[0], args[1], args[2], args[3], args[4], args[5],
  		       sp, pc);
  }
  #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */

  /************************************************************************/
  /*                       Here the fs part begins                        */
  /************************************************************************/
  
  /* permission checks */

  static int proc_fd_access_allowed(struct inode *inode)

  {

  	struct task_struct *task;
  	int allowed = 0;

  	/* Allow access to a task's file descriptors if it is us or we
  	 * may use ptrace attach to the process and find out that
  	 * information.

  	 */
  	task = get_proc_task(inode);

  	if (task) {

  		allowed = ptrace_may_access(task, PTRACE_MODE_READ);

  		put_task_struct(task);

  	}

  	return allowed;

  }

  static int proc_setattr(struct dentry *dentry, struct iattr *attr)
  {
  	int error;
  	struct inode *inode = dentry->d_inode;
  
  	if (attr->ia_valid & ATTR_MODE)
  		return -EPERM;
  
  	error = inode_change_ok(inode, attr);

  	if (!error)
  		error = inode_setattr(inode, attr);

  	return error;
  }

  static const struct inode_operations proc_def_inode_operations = {

  	.setattr	= proc_setattr,
  };

  static int mounts_open_common(struct inode *inode, struct file *file,
  			      const struct seq_operations *op)

  {

  	struct task_struct *task = get_proc_task(inode);

  	struct nsproxy *nsp;

  	struct mnt_namespace *ns = NULL;

  	struct fs_struct *fs = NULL;
  	struct path root;

  	struct proc_mounts *p;
  	int ret = -EINVAL;

  	if (task) {

  		rcu_read_lock();
  		nsp = task_nsproxy(task);
  		if (nsp) {
  			ns = nsp->mnt_ns;

  			if (ns)
  				get_mnt_ns(ns);
  		}

  		rcu_read_unlock();

  		if (ns)
  			fs = get_fs_struct(task);

  		put_task_struct(task);
  	}

  	if (!ns)
  		goto err;
  	if (!fs)
  		goto err_put_ns;
  
  	read_lock(&fs->lock);
  	root = fs->root;
  	path_get(&root);
  	read_unlock(&fs->lock);
  	put_fs_struct(fs);
  
  	ret = -ENOMEM;
  	p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
  	if (!p)
  		goto err_put_path;
  
  	file->private_data = &p->m;
  	ret = seq_open(file, op);
  	if (ret)
  		goto err_free;
  
  	p->m.private = p;
  	p->ns = ns;
  	p->root = root;
  	p->event = ns->event;
  
  	return 0;
  
   err_free:
  	kfree(p);
   err_put_path:
  	path_put(&root);
   err_put_ns:
  	put_mnt_ns(ns);
   err:

  	return ret;
  }
  
  static int mounts_release(struct inode *inode, struct file *file)
  {

  	struct proc_mounts *p = file->private_data;
  	path_put(&p->root);
  	put_mnt_ns(p->ns);

  	return seq_release(inode, file);
  }

  static unsigned mounts_poll(struct file *file, poll_table *wait)
  {
  	struct proc_mounts *p = file->private_data;

  	struct mnt_namespace *ns = p->ns;

  	unsigned res = 0;
  
  	poll_wait(file, &ns->poll, wait);
  
  	spin_lock(&vfsmount_lock);
  	if (p->event != ns->event) {
  		p->event = ns->event;
  		res = POLLERR;
  	}
  	spin_unlock(&vfsmount_lock);
  
  	return res;
  }

  static int mounts_open(struct inode *inode, struct file *file)
  {
  	return mounts_open_common(inode, file, &mounts_op);
  }

  static const struct file_operations proc_mounts_operations = {

  	.open		= mounts_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= mounts_release,

  	.poll		= mounts_poll,

  };

  static int mountinfo_open(struct inode *inode, struct file *file)
  {
  	return mounts_open_common(inode, file, &mountinfo_op);
  }
  
  static const struct file_operations proc_mountinfo_operations = {
  	.open		= mountinfo_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= mounts_release,
  	.poll		= mounts_poll,
  };

  static int mountstats_open(struct inode *inode, struct file *file)
  {

  	return mounts_open_common(inode, file, &mountstats_op);

  }

  static const struct file_operations proc_mountstats_operations = {

  	.open		= mountstats_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= mounts_release,
  };

  #define PROC_BLOCK_SIZE	(3*1024)		/* 4K page size but our output routines use some slack for overruns */
  
  static ssize_t proc_info_read(struct file * file, char __user * buf,
  			  size_t count, loff_t *ppos)
  {

  	struct inode * inode = file->f_path.dentry->d_inode;

  	unsigned long page;
  	ssize_t length;

  	struct task_struct *task = get_proc_task(inode);
  
  	length = -ESRCH;
  	if (!task)
  		goto out_no_task;

  
  	if (count > PROC_BLOCK_SIZE)
  		count = PROC_BLOCK_SIZE;

  
  	length = -ENOMEM;

  	if (!(page = __get_free_page(GFP_TEMPORARY)))

  		goto out;

  
  	length = PROC_I(inode)->op.proc_read(task, (char*)page);
  
  	if (length >= 0)
  		length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
  	free_page(page);

  out:
  	put_task_struct(task);
  out_no_task:

  	return length;
  }

  static const struct file_operations proc_info_file_operations = {

  	.read		= proc_info_read,
  };

  static int proc_single_show(struct seq_file *m, void *v)
  {
  	struct inode *inode = m->private;
  	struct pid_namespace *ns;
  	struct pid *pid;
  	struct task_struct *task;
  	int ret;
  
  	ns = inode->i_sb->s_fs_info;
  	pid = proc_pid(inode);
  	task = get_pid_task(pid, PIDTYPE_PID);
  	if (!task)
  		return -ESRCH;
  
  	ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
  
  	put_task_struct(task);
  	return ret;
  }
  
  static int proc_single_open(struct inode *inode, struct file *filp)
  {
  	int ret;
  	ret = single_open(filp, proc_single_show, NULL);
  	if (!ret) {
  		struct seq_file *m = filp->private_data;
  
  		m->private = inode;
  	}
  	return ret;
  }
  
  static const struct file_operations proc_single_file_operations = {
  	.open		= proc_single_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };

  static int mem_open(struct inode* inode, struct file* file)
  {
  	file->private_data = (void*)((long)current->self_exec_id);
  	return 0;
  }
  
  static ssize_t mem_read(struct file * file, char __user * buf,
  			size_t count, loff_t *ppos)
  {

  	struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);

  	char *page;
  	unsigned long src = *ppos;
  	int ret = -ESRCH;
  	struct mm_struct *mm;

  	if (!task)
  		goto out_no_task;

  	if (check_mem_permission(task))

  		goto out;
  
  	ret = -ENOMEM;

  	page = (char *)__get_free_page(GFP_TEMPORARY);

  	if (!page)
  		goto out;
  
  	ret = 0;
   
  	mm = get_task_mm(task);
  	if (!mm)
  		goto out_free;
  
  	ret = -EIO;
   
  	if (file->private_data != (void*)((long)current->self_exec_id))
  		goto out_put;
  
  	ret = 0;
   
  	while (count > 0) {
  		int this_len, retval;
  
  		this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
  		retval = access_process_vm(task, src, page, this_len, 0);

  		if (!retval || check_mem_permission(task)) {

  			if (!ret)
  				ret = -EIO;
  			break;
  		}
  
  		if (copy_to_user(buf, page, retval)) {
  			ret = -EFAULT;
  			break;
  		}
   
  		ret += retval;
  		src += retval;
  		buf += retval;
  		count -= retval;
  	}
  	*ppos = src;
  
  out_put:
  	mmput(mm);
  out_free:
  	free_page((unsigned long) page);
  out:

  	put_task_struct(task);
  out_no_task:

  	return ret;
  }
  
  #define mem_write NULL
  
  #ifndef mem_write
  /* This is a security hazard */

  static ssize_t mem_write(struct file * file, const char __user *buf,

  			 size_t count, loff_t *ppos)
  {

  	int copied;

  	char *page;

  	struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);

  	unsigned long dst = *ppos;

  	copied = -ESRCH;
  	if (!task)
  		goto out_no_task;

  	if (check_mem_permission(task))

  		goto out;

  	copied = -ENOMEM;

  	page = (char *)__get_free_page(GFP_TEMPORARY);

  	if (!page)

  		goto out;

  	copied = 0;

  	while (count > 0) {
  		int this_len, retval;
  
  		this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
  		if (copy_from_user(page, buf, this_len)) {
  			copied = -EFAULT;
  			break;
  		}
  		retval = access_process_vm(task, dst, page, this_len, 1);
  		if (!retval) {
  			if (!copied)
  				copied = -EIO;
  			break;
  		}
  		copied += retval;
  		buf += retval;
  		dst += retval;
  		count -= retval;			
  	}
  	*ppos = dst;
  	free_page((unsigned long) page);

  out:
  	put_task_struct(task);
  out_no_task:

  	return copied;
  }
  #endif

  loff_t mem_lseek(struct file *file, loff_t offset, int orig)

  {
  	switch (orig) {
  	case 0:
  		file->f_pos = offset;
  		break;
  	case 1:
  		file->f_pos += offset;
  		break;
  	default:
  		return -EINVAL;
  	}
  	force_successful_syscall_return();
  	return file->f_pos;
  }

  static const struct file_operations proc_mem_operations = {

  	.llseek		= mem_lseek,
  	.read		= mem_read,
  	.write		= mem_write,
  	.open		= mem_open,
  };

  static ssize_t environ_read(struct file *file, char __user *buf,
  			size_t count, loff_t *ppos)
  {
  	struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
  	char *page;
  	unsigned long src = *ppos;
  	int ret = -ESRCH;
  	struct mm_struct *mm;
  
  	if (!task)
  		goto out_no_task;

  	if (!ptrace_may_access(task, PTRACE_MODE_READ))

  		goto out;
  
  	ret = -ENOMEM;
  	page = (char *)__get_free_page(GFP_TEMPORARY);
  	if (!page)
  		goto out;
  
  	ret = 0;
  
  	mm = get_task_mm(task);
  	if (!mm)
  		goto out_free;
  
  	while (count > 0) {
  		int this_len, retval, max_len;
  
  		this_len = mm->env_end - (mm->env_start + src);
  
  		if (this_len <= 0)
  			break;
  
  		max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
  		this_len = (this_len > max_len) ? max_len : this_len;
  
  		retval = access_process_vm(task, (mm->env_start + src),
  			page, this_len, 0);
  
  		if (retval <= 0) {
  			ret = retval;
  			break;
  		}
  
  		if (copy_to_user(buf, page, retval)) {
  			ret = -EFAULT;
  			break;
  		}
  
  		ret += retval;
  		src += retval;
  		buf += retval;
  		count -= retval;
  	}
  	*ppos = src;
  
  	mmput(mm);
  out_free:
  	free_page((unsigned long) page);
  out:
  	put_task_struct(task);
  out_no_task:
  	return ret;
  }
  
  static const struct file_operations proc_environ_operations = {
  	.read		= environ_read,
  };

  static ssize_t oom_adjust_read(struct file *file, char __user *buf,
  				size_t count, loff_t *ppos)
  {

  	struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);

  	char buffer[PROC_NUMBUF];

  	size_t len;

  	int oom_adjust;

  	if (!task)
  		return -ESRCH;
  	oom_adjust = task->oomkilladj;
  	put_task_struct(task);

  	len = snprintf(buffer, sizeof(buffer), "%i
  ", oom_adjust);

  
  	return simple_read_from_buffer(buf, count, ppos, buffer, len);

  }
  
  static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
  				size_t count, loff_t *ppos)
  {

  	struct task_struct *task;

  	char buffer[PROC_NUMBUF], *end;

  	int oom_adjust;

  	memset(buffer, 0, sizeof(buffer));
  	if (count > sizeof(buffer) - 1)
  		count = sizeof(buffer) - 1;

  	if (copy_from_user(buffer, buf, count))
  		return -EFAULT;
  	oom_adjust = simple_strtol(buffer, &end, 0);

  	if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
  	     oom_adjust != OOM_DISABLE)

  		return -EINVAL;
  	if (*end == '
  ')
  		end++;

  	task = get_proc_task(file->f_path.dentry->d_inode);

  	if (!task)
  		return -ESRCH;

  	if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) {
  		put_task_struct(task);
  		return -EACCES;
  	}

  	task->oomkilladj = oom_adjust;

  	put_task_struct(task);

  	if (end - buffer == 0)
  		return -EIO;
  	return end - buffer;
  }

  static const struct file_operations proc_oom_adjust_operations = {

  	.read		= oom_adjust_read,
  	.write		= oom_adjust_write,
  };

  #ifdef CONFIG_AUDITSYSCALL
  #define TMPBUFLEN 21
  static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
  				  size_t count, loff_t *ppos)
  {

  	struct inode * inode = file->f_path.dentry->d_inode;

  	struct task_struct *task = get_proc_task(inode);

  	ssize_t length;
  	char tmpbuf[TMPBUFLEN];

  	if (!task)
  		return -ESRCH;

  	length = scnprintf(tmpbuf, TMPBUFLEN, "%u",

  				audit_get_loginuid(task));

  	put_task_struct(task);

  	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
  }
  
  static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
  				   size_t count, loff_t *ppos)
  {

  	struct inode * inode = file->f_path.dentry->d_inode;

  	char *page, *tmp;
  	ssize_t length;

  	uid_t loginuid;
  
  	if (!capable(CAP_AUDIT_CONTROL))
  		return -EPERM;

  	if (current != pid_task(proc_pid(inode), PIDTYPE_PID))

  		return -EPERM;

  	if (count >= PAGE_SIZE)
  		count = PAGE_SIZE - 1;

  
  	if (*ppos != 0) {
  		/* No partial writes. */
  		return -EINVAL;
  	}

  	page = (char*)__get_free_page(GFP_TEMPORARY);

  	if (!page)
  		return -ENOMEM;
  	length = -EFAULT;
  	if (copy_from_user(page, buf, count))
  		goto out_free_page;

  	page[count] = '\0';

  	loginuid = simple_strtoul(page, &tmp, 10);
  	if (tmp == page) {
  		length = -EINVAL;
  		goto out_free_page;
  
  	}

  	length = audit_set_loginuid(current, loginuid);

  	if (likely(length == 0))
  		length = count;
  
  out_free_page:
  	free_page((unsigned long) page);
  	return length;
  }

  static const struct file_operations proc_loginuid_operations = {

  	.read		= proc_loginuid_read,
  	.write		= proc_loginuid_write,
  };

  
  static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
  				  size_t count, loff_t *ppos)
  {
  	struct inode * inode = file->f_path.dentry->d_inode;
  	struct task_struct *task = get_proc_task(inode);
  	ssize_t length;
  	char tmpbuf[TMPBUFLEN];
  
  	if (!task)
  		return -ESRCH;
  	length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
  				audit_get_sessionid(task));
  	put_task_struct(task);
  	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
  }
  
  static const struct file_operations proc_sessionid_operations = {
  	.read		= proc_sessionid_read,
  };

  #endif

  #ifdef CONFIG_FAULT_INJECTION
  static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
  				      size_t count, loff_t *ppos)
  {
  	struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
  	char buffer[PROC_NUMBUF];
  	size_t len;
  	int make_it_fail;

  
  	if (!task)
  		return -ESRCH;
  	make_it_fail = task->make_it_fail;
  	put_task_struct(task);
  
  	len = snprintf(buffer, sizeof(buffer), "%i
  ", make_it_fail);

  
  	return simple_read_from_buffer(buf, count, ppos, buffer, len);

  }
  
  static ssize_t proc_fault_inject_write(struct file * file,
  			const char __user * buf, size_t count, loff_t *ppos)
  {
  	struct task_struct *task;
  	char buffer[PROC_NUMBUF], *end;
  	int make_it_fail;
  
  	if (!capable(CAP_SYS_RESOURCE))
  		return -EPERM;
  	memset(buffer, 0, sizeof(buffer));
  	if (count > sizeof(buffer) - 1)
  		count = sizeof(buffer) - 1;
  	if (copy_from_user(buffer, buf, count))
  		return -EFAULT;
  	make_it_fail = simple_strtol(buffer, &end, 0);
  	if (*end == '
  ')
  		end++;
  	task = get_proc_task(file->f_dentry->d_inode);
  	if (!task)
  		return -ESRCH;
  	task->make_it_fail = make_it_fail;
  	put_task_struct(task);
  	if (end - buffer == 0)
  		return -EIO;
  	return end - buffer;
  }

  static const struct file_operations proc_fault_inject_operations = {

  	.read		= proc_fault_inject_read,
  	.write		= proc_fault_inject_write,
  };
  #endif

  #ifdef CONFIG_SCHED_DEBUG
  /*
   * Print out various scheduling related per-task fields:
   */
  static int sched_show(struct seq_file *m, void *v)
  {
  	struct inode *inode = m->private;
  	struct task_struct *p;
  
  	WARN_ON(!inode);
  
  	p = get_proc_task(inode);
  	if (!p)
  		return -ESRCH;
  	proc_sched_show_task(p, m);
  
  	put_task_struct(p);
  
  	return 0;
  }
  
  static ssize_t
  sched_write(struct file *file, const char __user *buf,
  	    size_t count, loff_t *offset)
  {
  	struct inode *inode = file->f_path.dentry->d_inode;
  	struct task_struct *p;
  
  	WARN_ON(!inode);
  
  	p = get_proc_task(inode);
  	if (!p)
  		return -ESRCH;
  	proc_sched_set_task(p);
  
  	put_task_struct(p);
  
  	return count;
  }
  
  static int sched_open(struct inode *inode, struct file *filp)
  {
  	int ret;
  
  	ret = single_open(filp, sched_show, NULL);
  	if (!ret) {
  		struct seq_file *m = filp->private_data;
  
  		m->private = inode;
  	}
  	return ret;
  }
  
  static const struct file_operations proc_pid_sched_operations = {
  	.open		= sched_open,
  	.read		= seq_read,
  	.write		= sched_write,
  	.llseek		= seq_lseek,

  	.release	= single_release,

  };
  
  #endif

  /*
   * We added or removed a vma mapping the executable. The vmas are only mapped
   * during exec and are not mapped with the mmap system call.
   * Callers must hold down_write() on the mm's mmap_sem for these
   */
  void added_exe_file_vma(struct mm_struct *mm)
  {
  	mm->num_exe_file_vmas++;
  }
  
  void removed_exe_file_vma(struct mm_struct *mm)
  {
  	mm->num_exe_file_vmas--;
  	if ((mm->num_exe_file_vmas == 0) && mm->exe_file){
  		fput(mm->exe_file);
  		mm->exe_file = NULL;
  	}
  
  }
  
  void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
  {
  	if (new_exe_file)
  		get_file(new_exe_file);
  	if (mm->exe_file)
  		fput(mm->exe_file);
  	mm->exe_file = new_exe_file;
  	mm->num_exe_file_vmas = 0;
  }
  
  struct file *get_mm_exe_file(struct mm_struct *mm)
  {
  	struct file *exe_file;
  
  	/* We need mmap_sem to protect against races with removal of
  	 * VM_EXECUTABLE vmas */
  	down_read(&mm->mmap_sem);
  	exe_file = mm->exe_file;
  	if (exe_file)
  		get_file(exe_file);
  	up_read(&mm->mmap_sem);
  	return exe_file;
  }
  
  void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm)
  {
  	/* It's safe to write the exe_file pointer without exe_file_lock because
  	 * this is called during fork when the task is not yet in /proc */
  	newmm->exe_file = get_mm_exe_file(oldmm);
  }
  
  static int proc_exe_link(struct inode *inode, struct path *exe_path)
  {
  	struct task_struct *task;
  	struct mm_struct *mm;
  	struct file *exe_file;
  
  	task = get_proc_task(inode);
  	if (!task)
  		return -ENOENT;
  	mm = get_task_mm(task);
  	put_task_struct(task);
  	if (!mm)
  		return -ENOENT;
  	exe_file = get_mm_exe_file(mm);
  	mmput(mm);
  	if (exe_file) {
  		*exe_path = exe_file->f_path;
  		path_get(&exe_file->f_path);
  		fput(exe_file);
  		return 0;
  	} else
  		return -ENOENT;
  }

  static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)

  {
  	struct inode *inode = dentry->d_inode;
  	int error = -EACCES;
  
  	/* We don't need a base pointer in the /proc filesystem */

  	path_put(&nd->path);

  	/* Are we allowed to snoop on the tasks file descriptors? */
  	if (!proc_fd_access_allowed(inode))

  		goto out;

  	error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);

  	nd->last_type = LAST_BIND;
  out:

  	return ERR_PTR(error);

  }

  static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)

  {

  	char *tmp = (char*)__get_free_page(GFP_TEMPORARY);

  	char *pathname;

  	int len;
  
  	if (!tmp)
  		return -ENOMEM;

  	pathname = d_path(path, tmp, PAGE_SIZE);

  	len = PTR_ERR(pathname);
  	if (IS_ERR(pathname))

  		goto out;

  	len = tmp + PAGE_SIZE - 1 - pathname;

  
  	if (len > buflen)
  		len = buflen;

  	if (copy_to_user(buffer, pathname, len))

  		len = -EFAULT;
   out:
  	free_page((unsigned long)tmp);
  	return len;
  }
  
  static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
  {
  	int error = -EACCES;
  	struct inode *inode = dentry->d_inode;

  	struct path path;

  	/* Are we allowed to snoop on the tasks file descriptors? */
  	if (!proc_fd_access_allowed(inode))

  		goto out;

  	error = PROC_I(inode)->op.proc_get_link(inode, &path);

  	if (error)
  		goto out;

  	error = do_proc_readlink(&path, buffer, buflen);
  	path_put(&path);

  out:

  	return error;
  }

  static const struct inode_operations proc_pid_link_inode_operations = {

  	.readlink	= proc_pid_readlink,

  	.follow_link	= proc_pid_follow_link,
  	.setattr	= proc_setattr,

  };

  
  /* building an inode */
  
  static int task_dumpable(struct task_struct *task)

  {

  	int dumpable = 0;
  	struct mm_struct *mm;

  	task_lock(task);
  	mm = task->mm;
  	if (mm)

  		dumpable = get_dumpable(mm);

  	task_unlock(task);
  	if(dumpable == 1)
  		return 1;
  	return 0;
  }

  static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)

  {
  	struct inode * inode;
  	struct proc_inode *ei;

  	/* We need a new inode */

  	inode = new_inode(sb);
  	if (!inode)
  		goto out;
  
  	/* Common stuff */
  	ei = PROC_I(inode);
  	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;

  	inode->i_op = &proc_def_inode_operations;
  
  	/*
  	 * grab the reference to task.
  	 */

  	ei->pid = get_task_pid(task, PIDTYPE_PID);

  	if (!ei->pid)
  		goto out_unlock;
  
  	inode->i_uid = 0;
  	inode->i_gid = 0;
  	if (task_dumpable(task)) {
  		inode->i_uid = task->euid;
  		inode->i_gid = task->egid;

  	}

  	security_task_to_inode(task, inode);

  out:

  	return inode;
  
  out_unlock:
  	iput(inode);
  	return NULL;

  }

  static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)

  {

  	struct inode *inode = dentry->d_inode;

  	struct task_struct *task;
  	generic_fillattr(inode, stat);

  	rcu_read_lock();
  	stat->uid = 0;
  	stat->gid = 0;
  	task = pid_task(proc_pid(inode), PIDTYPE_PID);
  	if (task) {
  		if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
  		    task_dumpable(task)) {
  			stat->uid = task->euid;
  			stat->gid = task->egid;

  		}
  	}

  	rcu_read_unlock();

  	return 0;

  }

  /* dentry stuff */
  
  /*
   *	Exceptional case: normally we are not allowed to unhash a busy
   * directory. In this case, however, we can do it - no aliasing problems
   * due to the way we treat inodes.
   *
   * Rewrite the inode's ownerships here because the owning task may have
   * performed a setuid(), etc.

   *
   * Before the /proc/pid/status file was created the only way to read
   * the effective uid of a /process was to stat /proc/pid.  Reading
   * /proc/pid/status is slow enough that procps and other packages
   * kept stating /proc/pid.  To keep the rules in /proc simple I have
   * made this apply to all per process world readable and executable
   * directories.

   */
  static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
  {
  	struct inode *inode = dentry->d_inode;

  	struct task_struct *task = get_proc_task(inode);
  	if (task) {
  		if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
  		    task_dumpable(task)) {

  			inode->i_uid = task->euid;
  			inode->i_gid = task->egid;
  		} else {
  			inode->i_uid = 0;
  			inode->i_gid = 0;
  		}

  		inode->i_mode &= ~(S_ISUID | S_ISGID);

  		security_task_to_inode(task, inode);

  		put_task_struct(task);

  		return 1;
  	}
  	d_drop(dentry);
  	return 0;
  }

  static int pid_delete_dentry(struct dentry * dentry)

  {

  	/* Is the task we represent dead?
  	 * If so, then don't put the dentry on the lru list,
  	 * kill it immediately.
  	 */
  	return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
  }
  
  static struct dentry_operations pid_dentry_operations =
  {
  	.d_revalidate	= pid_revalidate,
  	.d_delete	= pid_delete_dentry,
  };
  
  /* Lookups */

  typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
  				struct task_struct *, const void *);

  /*
   * Fill a directory entry.
   *
   * If possible create the dcache entry and derive our inode number and
   * file type from dcache entry.
   *
   * Since all of the proc inode numbers are dynamically generated, the inode
   * numbers do not exist until the inode is cache.  This means creating the
   * the dcache entry in readdir is necessary to keep the inode numbers
   * reported by readdir in sync with the inode numbers reported
   * by stat.
   */

  static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
  	char *name, int len,

  	instantiate_t instantiate, struct task_struct *task, const void *ptr)

  {

  	struct dentry *child, *dir = filp->f_path.dentry;

  	struct inode *inode;
  	struct qstr qname;
  	ino_t ino = 0;
  	unsigned type = DT_UNKNOWN;
  
  	qname.name = name;
  	qname.len  = len;
  	qname.hash = full_name_hash(name, len);
  
  	child = d_lookup(dir, &qname);
  	if (!child) {
  		struct dentry *new;
  		new = d_alloc(dir, &qname);
  		if (new) {
  			child = instantiate(dir->d_inode, new, task, ptr);
  			if (child)
  				dput(new);
  			else
  				child = new;
  		}
  	}
  	if (!child || IS_ERR(child) || !child->d_inode)
  		goto end_instantiate;
  	inode = child->d_inode;
  	if (inode) {
  		ino = inode->i_ino;
  		type = inode->i_mode >> 12;
  	}
  	dput(child);
  end_instantiate:
  	if (!ino)
  		ino = find_inode_number(dir, &qname);
  	if (!ino)
  		ino = 1;
  	return filldir(dirent, name, len, filp->f_pos, ino, type);
  }

  static unsigned name_to_int(struct dentry *dentry)
  {
  	const char *name = dentry->d_name.name;
  	int len = dentry->d_name.len;
  	unsigned n = 0;
  
  	if (len > 1 && *name == '0')
  		goto out;
  	while (len-- > 0) {
  		unsigned c = *name++ - '0';
  		if (c > 9)
  			goto out;
  		if (n >= (~0U-9)/10)
  			goto out;
  		n *= 10;
  		n += c;
  	}
  	return n;
  out:
  	return ~0U;
  }

  #define PROC_FDINFO_MAX 64

  static int proc_fd_info(struct inode *inode, struct path *path, char *info)

  {
  	struct task_struct *task = get_proc_task(inode);
  	struct files_struct *files = NULL;
  	struct file *file;
  	int fd = proc_fd(inode);

  	if (task) {

  		files = get_files_struct(task);
  		put_task_struct(task);
  	}
  	if (files) {
  		/*
  		 * We are not taking a ref to the file structure, so we must
  		 * hold ->file_lock.
  		 */
  		spin_lock(&files->file_lock);
  		file = fcheck_files(files, fd);
  		if (file) {

  			if (path) {
  				*path = file->f_path;
  				path_get(&file->f_path);
  			}

  			if (info)
  				snprintf(info, PROC_FDINFO_MAX,
  					 "pos:\t%lli
  "
  					 "flags:\t0%o
  ",
  					 (long long) file->f_pos,
  					 file->f_flags);

  			spin_unlock(&files->file_lock);
  			put_files_struct(files);
  			return 0;

  		}

  		spin_unlock(&files->file_lock);
  		put_files_struct(files);

  	}

  	return -ENOENT;

  }

  static int proc_fd_link(struct inode *inode, struct path *path)

  {

  	return proc_fd_info(inode, path, NULL);

  }

  static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
  {
  	struct inode *inode = dentry->d_inode;

  	struct task_struct *task = get_proc_task(inode);

  	int fd = proc_fd(inode);

  	struct files_struct *files;

  	if (task) {
  		files = get_files_struct(task);
  		if (files) {
  			rcu_read_lock();
  			if (fcheck_files(files, fd)) {
  				rcu_read_unlock();
  				put_files_struct(files);
  				if (task_dumpable(task)) {
  					inode->i_uid = task->euid;
  					inode->i_gid = task->egid;
  				} else {
  					inode->i_uid = 0;
  					inode->i_gid = 0;
  				}

  				inode->i_mode &= ~(S_ISUID | S_ISGID);

  				security_task_to_inode(task, inode);
  				put_task_struct(task);
  				return 1;
  			}

  			rcu_read_unlock();

  			put_files_struct(files);

  		}

  		put_task_struct(task);

  	}
  	d_drop(dentry);
  	return 0;
  }

  static struct dentry_operations tid_fd_dentry_operations =
  {
  	.d_revalidate	= tid_fd_revalidate,
  	.d_delete	= pid_delete_dentry,
  };

  static struct dentry *proc_fd_instantiate(struct inode *dir,

  	struct dentry *dentry, struct task_struct *task, const void *ptr)

  {

  	unsigned fd = *(const unsigned *)ptr;

  	struct file *file;
  	struct files_struct *files;
   	struct inode *inode;
   	struct proc_inode *ei;
  	struct dentry *error = ERR_PTR(-ENOENT);

  	inode = proc_pid_make_inode(dir->i_sb, task);

  	if (!inode)
  		goto out;
  	ei = PROC_I(inode);

  	ei->fd = fd;

  	files = get_files_struct(task);
  	if (!files)

  		goto out_iput;

  	inode->i_mode = S_IFLNK;

  
  	/*
  	 * We are not taking a ref to the file structure, so we must
  	 * hold ->file_lock.
  	 */
  	spin_lock(&files->file_lock);

  	file = fcheck_files(files, fd);
  	if (!file)

  		goto out_unlock;

  	if (file->f_mode & FMODE_READ)

  		inode->i_mode |= S_IRUSR | S_IXUSR;

  	if (file->f_mode & FMODE_WRITE)

  		inode->i_mode |= S_IWUSR | S_IXUSR;

  	spin_unlock(&files->file_lock);

  	put_files_struct(files);

  	inode->i_op = &proc_pid_link_inode_operations;
  	inode->i_size = 64;
  	ei->op.proc_get_link = proc_fd_link;
  	dentry->d_op = &tid_fd_dentry_operations;
  	d_add(dentry, inode);

  	/* Close the race of the process dying before we return the dentry */
  	if (tid_fd_revalidate(dentry, NULL))

  		error = NULL;

   out:
  	return error;
  out_unlock:

  	spin_unlock(&files->file_lock);

  	put_files_struct(files);

  out_iput:

  	iput(inode);

  	goto out;

  }

  static struct dentry *proc_lookupfd_common(struct inode *dir,
  					   struct dentry *dentry,
  					   instantiate_t instantiate)

  {
  	struct task_struct *task = get_proc_task(dir);
  	unsigned fd = name_to_int(dentry);
  	struct dentry *result = ERR_PTR(-ENOENT);
  
  	if (!task)
  		goto out_no_task;
  	if (fd == ~0U)
  		goto out;

  	result = instantiate(dir, dentry, task, &fd);

  out:
  	put_task_struct(task);
  out_no_task:
  	return result;
  }

  static int proc_readfd_common(struct file * filp, void * dirent,
  			      filldir_t filldir, instantiate_t instantiate)

  {

  	struct dentry *dentry = filp->f_path.dentry;

  	struct inode *inode = dentry->d_inode;
  	struct task_struct *p = get_proc_task(inode);

  	unsigned int fd, ino;

  	int retval;

  	struct files_struct * files;

  	retval = -ENOENT;
  	if (!p)
  		goto out_no_task;
  	retval = 0;

  
  	fd = filp->f_pos;
  	switch (fd) {
  		case 0:
  			if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
  				goto out;
  			filp->f_pos++;
  		case 1:
  			ino = parent_ino(dentry);
  			if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
  				goto out;
  			filp->f_pos++;
  		default:
  			files = get_files_struct(p);
  			if (!files)
  				goto out;
  			rcu_read_lock();

  			for (fd = filp->f_pos-2;

  			     fd < files_fdtable(files)->max_fds;

  			     fd++, filp->f_pos++) {

  				char name[PROC_NUMBUF];
  				int len;

  
  				if (!fcheck_files(files, fd))
  					continue;
  				rcu_read_unlock();

  				len = snprintf(name, sizeof(name), "%d", fd);
  				if (proc_fill_cache(filp, dirent, filldir,
  						    name, len, instantiate,
  						    p, &fd) < 0) {

  					rcu_read_lock();
  					break;
  				}
  				rcu_read_lock();
  			}
  			rcu_read_unlock();
  			put_files_struct(files);
  	}
  out:
  	put_task_struct(p);
  out_no_task:
  	return retval;
  }

  static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
  				    struct nameidata *nd)
  {
  	return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
  }
  
  static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
  {
  	return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
  }
  
  static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
  				      size_t len, loff_t *ppos)
  {
  	char tmp[PROC_FDINFO_MAX];

  	int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);

  	if (!err)
  		err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
  	return err;
  }
  
  static const struct file_operations proc_fdinfo_file_operations = {
  	.open		= nonseekable_open,
  	.read		= proc_fdinfo_read,
  };

  static const struct file_operations proc_fd_operations = {

  	.read		= generic_read_dir,
  	.readdir	= proc_readfd,

  };
  
  /*

   * /proc/pid/fd needs a special permission handler so that a process can still
   * access /proc/self/fd after it has executed a setuid().
   */

  static int proc_fd_permission(struct inode *inode, int mask)

  {
  	int rv;
  
  	rv = generic_permission(inode, mask, NULL);
  	if (rv == 0)
  		return 0;
  	if (task_pid(current) == proc_pid(inode))
  		rv = 0;
  	return rv;
  }
  
  /*

   * proc directories can do almost nothing..
   */

  static const struct inode_operations proc_fd_inode_operations = {

  	.lookup		= proc_lookupfd,

  	.permission	= proc_fd_permission,

  	.setattr	= proc_setattr,

  };

  static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
  	struct dentry *dentry, struct task_struct *task, const void *ptr)
  {
  	unsigned fd = *(unsigned *)ptr;
   	struct inode *inode;
   	struct proc_inode *ei;
  	struct dentry *error = ERR_PTR(-ENOENT);
  
  	inode = proc_pid_make_inode(dir->i_sb, task);
  	if (!inode)
  		goto out;
  	ei = PROC_I(inode);
  	ei->fd = fd;
  	inode->i_mode = S_IFREG | S_IRUSR;
  	inode->i_fop = &proc_fdinfo_file_operations;
  	dentry->d_op = &tid_fd_dentry_operations;
  	d_add(dentry, inode);
  	/* Close the race of the process dying before we return the dentry */
  	if (tid_fd_revalidate(dentry, NULL))
  		error = NULL;
  
   out:
  	return error;
  }
  
  static struct dentry *proc_lookupfdinfo(struct inode *dir,
  					struct dentry *dentry,
  					struct nameidata *nd)
  {
  	return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
  }
  
  static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
  {
  	return proc_readfd_common(filp, dirent, filldir,
  				  proc_fdinfo_instantiate);
  }
  
  static const struct file_operations proc_fdinfo_operations = {
  	.read		= generic_read_dir,
  	.readdir	= proc_readfdinfo,
  };
  
  /*
   * proc directories can do almost nothing..
   */
  static const struct inode_operations proc_fdinfo_inode_operations = {
  	.lookup		= proc_lookupfdinfo,
  	.setattr	= proc_setattr,
  };

  static struct dentry *proc_pident_instantiate(struct inode *dir,

  	struct dentry *dentry, struct task_struct *task, const void *ptr)

  {

  	const struct pid_entry *p = ptr;

  	struct inode *inode;
  	struct proc_inode *ei;
  	struct dentry *error = ERR_PTR(-EINVAL);

  	inode = proc_pid_make_inode(dir->i_sb, task);

  	if (!inode)
  		goto out;
  
  	ei = PROC_I(inode);
  	inode->i_mode = p->mode;
  	if (S_ISDIR(inode->i_mode))
  		inode->i_nlink = 2;	/* Use getattr to fix if necessary */
  	if (p->iop)
  		inode->i_op = p->iop;
  	if (p->fop)
  		inode->i_fop = p->fop;
  	ei->op = p->op;
  	dentry->d_op = &pid_dentry_operations;
  	d_add(dentry, inode);
  	/* Close the race of the process dying before we return the dentry */
  	if (pid_revalidate(dentry, NULL))
  		error = NULL;
  out:
  	return error;
  }

  static struct dentry *proc_pident_lookup(struct inode *dir, 
  					 struct dentry *dentry,

  					 const struct pid_entry *ents,

  					 unsigned int nents)

  {
  	struct inode *inode;

  	struct dentry *error;

  	struct task_struct *task = get_proc_task(dir);

  	const struct pid_entry *p, *last;

  	error = ERR_PTR(-ENOENT);

  	inode = NULL;

  	if (!task)
  		goto out_no_task;

  	/*
  	 * Yes, it does not scale. And it should not. Don't add
  	 * new entries into /proc/<tgid>/ without very good reasons.
  	 */

  	last = &ents[nents - 1];
  	for (p = ents; p <= last; p++) {

  		if (p->len != dentry->d_name.len)
  			continue;
  		if (!memcmp(dentry->d_name.name, p->name, p->len))
  			break;
  	}

  	if (p > last)

  		goto out;

  	error = proc_pident_instantiate(dir, dentry, task, p);

  out:

  	put_task_struct(task);
  out_no_task:

  	return error;

  }

  static int proc_pident_fill_cache(struct file *filp, void *dirent,
  	filldir_t filldir, struct task_struct *task, const struct pid_entry *p)

  {
  	return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
  				proc_pident_instantiate, task, p);
  }

  static int proc_pident_readdir(struct file *filp,
  		void *dirent, filldir_t filldir,

  		const struct pid_entry *ents, unsigned int nents)

  {
  	int i;

  	struct dentry *dentry = filp->f_path.dentry;

  	struct inode *inode = dentry->d_inode;
  	struct task_struct *task = get_proc_task(inode);

  	const struct pid_entry *p, *last;

  	ino_t ino;
  	int ret;
  
  	ret = -ENOENT;
  	if (!task)

  		goto out_no_task;

  
  	ret = 0;

  	i = filp->f_pos;
  	switch (i) {
  	case 0:
  		ino = inode->i_ino;
  		if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
  			goto out;
  		i++;
  		filp->f_pos++;
  		/* fall through */
  	case 1:
  		ino = parent_ino(dentry);
  		if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
  			goto out;
  		i++;
  		filp->f_pos++;
  		/* fall through */
  	default:
  		i -= 2;
  		if (i >= nents) {
  			ret = 1;
  			goto out;
  		}
  		p = ents + i;

  		last = &ents[nents - 1];
  		while (p <= last) {

  			if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)

  				goto out;
  			filp->f_pos++;
  			p++;
  		}
  	}
  
  	ret = 1;
  out:

  	put_task_struct(task);
  out_no_task:

  	return ret;

  }

  #ifdef CONFIG_SECURITY
  static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
  				  size_t count, loff_t *ppos)
  {

  	struct inode * inode = file->f_path.dentry->d_inode;

  	char *p = NULL;

  	ssize_t length;
  	struct task_struct *task = get_proc_task(inode);

  	if (!task)

  		return -ESRCH;

  
  	length = security_getprocattr(task,

  				      (char*)file->f_path.dentry->d_name.name,

  				      &p);

  	put_task_struct(task);

  	if (length > 0)
  		length = simple_read_from_buffer(buf, count, ppos, p, length);
  	kfree(p);

  	return length;

  }

  static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
  				   size_t count, loff_t *ppos)
  {

  	struct inode * inode = file->f_path.dentry->d_inode;

  	char *page;
  	ssize_t length;
  	struct task_struct *task = get_proc_task(inode);
  
  	length = -ESRCH;
  	if (!task)
  		goto out_no_task;
  	if (count > PAGE_SIZE)
  		count = PAGE_SIZE;
  
  	/* No partial writes. */
  	length = -EINVAL;
  	if (*ppos != 0)
  		goto out;
  
  	length = -ENOMEM;

  	page = (char*)__get_free_page(GFP_TEMPORARY);

  	if (!page)
  		goto out;
  
  	length = -EFAULT;
  	if (copy_from_user(page, buf, count))
  		goto out_free;
  
  	length = security_setprocattr(task,

  				      (char*)file->f_path.dentry->d_name.name,

  				      (void*)page, count);
  out_free:
  	free_page((unsigned long) page);
  out:
  	put_task_struct(task);
  out_no_task:
  	return length;
  }

  static const struct file_operations proc_pid_attr_operations = {

  	.read		= proc_pid_attr_read,
  	.write		= proc_pid_attr_write,
  };

  static const struct pid_entry attr_dir_stuff[] = {

  	REG("current",    S_IRUGO|S_IWUGO, pid_attr),
  	REG("prev",       S_IRUGO,	   pid_attr),
  	REG("exec",       S_IRUGO|S_IWUGO, pid_attr),
  	REG("fscreate",   S_IRUGO|S_IWUGO, pid_attr),
  	REG("keycreate",  S_IRUGO|S_IWUGO, pid_attr),
  	REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr),

  };

  static int proc_attr_dir_readdir(struct file * filp,

  			     void * dirent, filldir_t filldir)
  {
  	return proc_pident_readdir(filp,dirent,filldir,

  				   attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));

  }

  static const struct file_operations proc_attr_dir_operations = {

  	.read		= generic_read_dir,

  	.readdir	= proc_attr_dir_readdir,

  };

  static struct dentry *proc_attr_dir_lookup(struct inode *dir,

  				struct dentry *dentry, struct nameidata *nd)
  {

  	return proc_pident_lookup(dir, dentry,
  				  attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));

  }

  static const struct inode_operations proc_attr_dir_inode_operations = {

  	.lookup		= proc_attr_dir_lookup,

  	.getattr	= pid_getattr,

  	.setattr	= proc_setattr,

  };

  #endif

  #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
  static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
  					 size_t count, loff_t *ppos)
  {
  	struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
  	struct mm_struct *mm;
  	char buffer[PROC_NUMBUF];
  	size_t len;
  	int ret;
  
  	if (!task)
  		return -ESRCH;
  
  	ret = 0;
  	mm = get_task_mm(task);
  	if (mm) {
  		len = snprintf(buffer, sizeof(buffer), "%08lx
  ",
  			       ((mm->flags & MMF_DUMP_FILTER_MASK) >>
  				MMF_DUMP_FILTER_SHIFT));
  		mmput(mm);
  		ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
  	}
  
  	put_task_struct(task);
  
  	return ret;
  }
  
  static ssize_t proc_coredump_filter_write(struct file *file,
  					  const char __user *buf,
  					  size_t count,
  					  loff_t *ppos)
  {
  	struct task_struct *task;
  	struct mm_struct *mm;
  	char buffer[PROC_NUMBUF], *end;
  	unsigned int val;
  	int ret;
  	int i;
  	unsigned long mask;
  
  	ret = -EFAULT;
  	memset(buffer, 0, sizeof(buffer));
  	if (count > sizeof(buffer) - 1)
  		count = sizeof(buffer) - 1;
  	if (copy_from_user(buffer, buf, count))
  		goto out_no_task;
  
  	ret = -EINVAL;
  	val = (unsigned int)simple_strtoul(buffer, &end, 0);
  	if (*end == '
  ')
  		end++;
  	if (end - buffer == 0)
  		goto out_no_task;
  
  	ret = -ESRCH;
  	task = get_proc_task(file->f_dentry->d_inode);
  	if (!task)
  		goto out_no_task;
  
  	ret = end - buffer;
  	mm = get_task_mm(task);
  	if (!mm)
  		goto out_no_mm;
  
  	for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
  		if (val & mask)
  			set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
  		else
  			clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
  	}
  
  	mmput(mm);
   out_no_mm:
  	put_task_struct(task);
   out_no_task:
  	return ret;
  }
  
  static const struct file_operations proc_coredump_filter_operations = {
  	.read		= proc_coredump_filter_read,
  	.write		= proc_coredump_filter_write,
  };
  #endif

  /*
   * /proc/self:
   */
  static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
  			      int buflen)
  {

  	struct pid_namespace *ns = dentry->d_sb->s_fs_info;

  	pid_t tgid = task_tgid_nr_ns(current, ns);

  	char tmp[PROC_NUMBUF];

  	if (!tgid)

  		return -ENOENT;

  	sprintf(tmp, "%d", tgid);

  	return vfs_readlink(dentry,buffer,buflen,tmp);
  }
  
  static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
  {

  	struct pid_namespace *ns = dentry->d_sb->s_fs_info;

  	pid_t tgid = task_tgid_nr_ns(current, ns);

  	char tmp[PROC_NUMBUF];

  	if (!tgid)

  		return ERR_PTR(-ENOENT);

  	sprintf(tmp, "%d", task_tgid_nr_ns(current, ns));

  	return ERR_PTR(vfs_follow_link(nd,tmp));
  }

  static const struct inode_operations proc_self_inode_operations = {

  	.readlink	= proc_self_readlink,
  	.follow_link	= proc_self_follow_link,
  };
  
  /*

   * proc base
   *
   * These are the directory entries in the root directory of /proc
   * that properly belong to the /proc filesystem, as they describe
   * describe something that is process related.
   */

  static const struct pid_entry proc_base_stuff[] = {

  	NOD("self", S_IFLNK|S_IRWXUGO,

  		&proc_self_inode_operations, NULL, {}),

  };
  
  /*
   *	Exceptional case: normally we are not allowed to unhash a busy
   * directory. In this case, however, we can do it - no aliasing problems
   * due to the way we treat inodes.
   */
  static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd)
  {
  	struct inode *inode = dentry->d_inode;
  	struct task_struct *task = get_proc_task(inode);
  	if (task) {
  		put_task_struct(task);
  		return 1;
  	}
  	d_drop(dentry);
  	return 0;
  }
  
  static struct dentry_operations proc_base_dentry_operations =
  {
  	.d_revalidate	= proc_base_revalidate,
  	.d_delete	= pid_delete_dentry,
  };

  static struct dentry *proc_base_instantiate(struct inode *dir,

  	struct dentry *dentry, struct task_struct *task, const void *ptr)

  {

  	const struct pid_entry *p = ptr;

  	struct inode *inode;

  	struct proc_inode *ei;

  	struct dentry *error = ERR_PTR(-EINVAL);

  
  	/* Allocate the inode */
  	error = ERR_PTR(-ENOMEM);
  	inode = new_inode(dir->i_sb);
  	if (!inode)
  		goto out;
  
  	/* Initialize the inode */
  	ei = PROC_I(inode);
  	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;

  
  	/*
  	 * grab the reference to the task.
  	 */

  	ei->pid = get_task_pid(task, PIDTYPE_PID);

  	if (!ei->pid)
  		goto out_iput;
  
  	inode->i_uid = 0;
  	inode->i_gid = 0;
  	inode->i_mode = p->mode;
  	if (S_ISDIR(inode->i_mode))
  		inode->i_nlink = 2;
  	if (S_ISLNK(inode->i_mode))
  		inode->i_size = 64;
  	if (p->iop)
  		inode->i_op = p->iop;
  	if (p->fop)
  		inode->i_fop = p->fop;
  	ei->op = p->op;
  	dentry->d_op = &proc_base_dentry_operations;
  	d_add(dentry, inode);
  	error = NULL;
  out:

  	return error;
  out_iput:
  	iput(inode);
  	goto out;
  }

  static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
  {
  	struct dentry *error;
  	struct task_struct *task = get_proc_task(dir);

  	const struct pid_entry *p, *last;

  
  	error = ERR_PTR(-ENOENT);
  
  	if (!task)
  		goto out_no_task;
  
  	/* Lookup the directory entry */

  	last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
  	for (p = proc_base_stuff; p <= last; p++) {

  		if (p->len != dentry->d_name.len)
  			continue;
  		if (!memcmp(dentry->d_name.name, p->name, p->len))
  			break;
  	}

  	if (p > last)

  		goto out;
  
  	error = proc_base_instantiate(dir, dentry, task, p);
  
  out:
  	put_task_struct(task);
  out_no_task:
  	return error;
  }

  static int proc_base_fill_cache(struct file *filp, void *dirent,
  	filldir_t filldir, struct task_struct *task, const struct pid_entry *p)

  {
  	return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
  				proc_base_instantiate, task, p);
  }

  #ifdef CONFIG_TASK_IO_ACCOUNTING

  static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
  {

  	struct task_io_accounting acct = task->ioac;

  	unsigned long flags;
  
  	if (whole && lock_task_sighand(task, &flags)) {
  		struct task_struct *t = task;
  
  		task_io_accounting_add(&acct, &task->signal->ioac);
  		while_each_thread(task, t)
  			task_io_accounting_add(&acct, &t->ioac);
  
  		unlock_task_sighand(task, &flags);

  	}

  	return sprintf(buffer,
  			"rchar: %llu
  "
  			"wchar: %llu
  "
  			"syscr: %llu
  "
  			"syscw: %llu
  "
  			"read_bytes: %llu
  "
  			"write_bytes: %llu
  "
  			"cancelled_write_bytes: %llu
  ",

  			(unsigned long long)acct.rchar,
  			(unsigned long long)acct.wchar,
  			(unsigned long long)acct.syscr,
  			(unsigned long long)acct.syscw,
  			(unsigned long long)acct.read_bytes,
  			(unsigned long long)acct.write_bytes,
  			(unsigned long long)acct.cancelled_write_bytes);

  }
  
  static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
  {
  	return do_io_accounting(task, buffer, 0);

  }

  
  static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
  {
  	return do_io_accounting(task, buffer, 1);
  }
  #endif /* CONFIG_TASK_IO_ACCOUNTING */

  static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
  				struct pid *pid, struct task_struct *task)
  {
  	seq_printf(m, "%08x
  ", task->personality);
  	return 0;
  }

  /*

   * Thread groups
   */

  static const struct file_operations proc_task_operations;

  static const struct inode_operations proc_task_inode_operations;

  static const struct pid_entry tgid_base_stuff[] = {

  	DIR("task",       S_IRUGO|S_IXUGO, task),
  	DIR("fd",         S_IRUSR|S_IXUSR, fd),

  	DIR("fdinfo",     S_IRUSR|S_IXUSR, fdinfo),

  #ifdef CONFIG_NET

  	DIR("net",        S_IRUGO|S_IXUGO, net),

  #endif

  	REG("environ",    S_IRUSR, environ),

  	INF("auxv",       S_IRUSR, pid_auxv),

  	ONE("status",     S_IRUGO, pid_status),

  	ONE("personality", S_IRUSR, pid_personality),

  	INF("limits",	  S_IRUSR, pid_limits),

  #ifdef CONFIG_SCHED_DEBUG
  	REG("sched",      S_IRUGO|S_IWUSR, pid_sched),
  #endif

  #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
  	INF("syscall",    S_IRUSR, pid_syscall),
  #endif

  	INF("cmdline",    S_IRUGO, pid_cmdline),

  	ONE("stat",       S_IRUGO, tgid_stat),

  	ONE("statm",      S_IRUGO, pid_statm),

  	REG("maps",       S_IRUGO, maps),

  #ifdef CONFIG_NUMA

  	REG("numa_maps",  S_IRUGO, numa_maps),

  #endif

  	REG("mem",        S_IRUSR|S_IWUSR, mem),

  	LNK("cwd",        cwd),
  	LNK("root",       root),
  	LNK("exe",        exe),
  	REG("mounts",     S_IRUGO, mounts),

  	REG("mountinfo",  S_IRUGO, mountinfo),

  	REG("mountstats", S_IRUSR, mountstats),

  #ifdef CONFIG_PROC_PAGE_MONITOR

  	REG("clear_refs", S_IWUSR, clear_refs),

  	REG("smaps",      S_IRUGO, smaps),

  	REG("pagemap",    S_IRUSR, pagemap),

  #endif
  #ifdef CONFIG_SECURITY

  	DIR("attr",       S_IRUGO|S_IXUGO, attr_dir),

  #endif
  #ifdef CONFIG_KALLSYMS

  	INF("wchan",      S_IRUGO, pid_wchan),