/*
    Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file

    This file is part of libzmq, the ZeroMQ core engine in C++.

    libzmq is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License (LGPL) as published
    by the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    As a special exception, the Contributors give you permission to link
    this library with independent modules to produce an executable,
    regardless of the license terms of these independent modules, and to
    copy and distribute the resulting executable under terms of your choice,
    provided that you also meet, for each linked independent module, the
    terms and conditions of the license of that module. An independent
    module is a module which is not derived from or based on this library.
    If you modify this library, you must extend this exception to your
    version of the library.

    libzmq 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 Lesser General Public
    License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "testutil.hpp"

void test_single_connect_ipv4 (void)
{
    void *ctx = zmq_ctx_new ();
    assert (ctx);

    void *sb = zmq_socket (ctx, ZMQ_REP);
    assert (sb);
    int rc = zmq_bind (sb, "tcp://127.0.0.1:5560");
    assert (rc == 0);

    void *sc = zmq_socket (ctx, ZMQ_REQ);
    assert (sc);
    rc = zmq_connect (sc, "tcp://127.0.0.1:5560");
    assert (rc == 0);

    bounce (sb, sc);

    rc = zmq_disconnect (sc, "tcp://127.0.0.1:5560");
    assert (rc == 0);

    rc = zmq_unbind (sb, "tcp://127.0.0.1:5560");
    assert (rc == 0);

    rc = zmq_close (sc);
    assert (rc == 0);

    rc = zmq_close (sb);
    assert (rc == 0);

    rc = zmq_ctx_term (ctx);
    assert (rc == 0);
}

void test_multi_connect_ipv4 (void)
{
    void *ctx = zmq_ctx_new ();
    assert (ctx);

    void *sb0 = zmq_socket (ctx, ZMQ_REP);
    assert (sb0);
    int rc = zmq_bind (sb0, "tcp://127.0.0.1:5560");
    assert (rc == 0);

    void *sb1 = zmq_socket (ctx, ZMQ_REP);
    assert (sb1);
    rc = zmq_bind (sb1, "tcp://127.0.0.1:5561");
    assert (rc == 0);

    void *sb2 = zmq_socket (ctx, ZMQ_REP);
    assert (sb2);
    rc = zmq_bind (sb2, "tcp://127.0.0.1:5562");
    assert (rc == 0);

    void *sc = zmq_socket (ctx, ZMQ_REQ);
    assert (sc);
    rc = zmq_connect (sc, "tcp://127.0.0.1:5560");
    assert (rc == 0);
    rc = zmq_connect (sc, "tcp://127.0.0.1:5561");
    assert (rc == 0);
    rc = zmq_connect (sc, "tcp://127.0.0.1:5564;127.0.0.1:5562");
    assert (rc == 0);

    bounce (sb0, sc);
    bounce (sb1, sc);
    bounce (sb2, sc);
    bounce (sb0, sc);
    bounce (sb1, sc);
    bounce (sb2, sc);
    bounce (sb0, sc);

    rc = zmq_disconnect (sc, "tcp://127.0.0.1:5560");
    assert (rc == 0);
    rc = zmq_disconnect (sc, "tcp://127.0.0.1:5564;127.0.0.1:5562");
    assert (rc == 0);
    rc = zmq_disconnect (sc, "tcp://127.0.0.1:5561");
    assert (rc == 0);

    rc = zmq_unbind (sb0, "tcp://127.0.0.1:5560");
    assert (rc == 0);

    rc = zmq_unbind (sb1, "tcp://127.0.0.1:5561");
    assert (rc == 0);

    rc = zmq_unbind (sb2, "tcp://127.0.0.1:5562");
    assert (rc == 0);

    rc = zmq_close (sc);
    assert (rc == 0);

    rc = zmq_close (sb0);
    assert (rc == 0);

    rc = zmq_close (sb1);
    assert (rc == 0);

    rc = zmq_close (sb2);
    assert (rc == 0);

    rc = zmq_ctx_term (ctx);
    assert (rc == 0);
}

void test_single_connect_ipv6 (void)
{
    void *ctx = zmq_ctx_new ();
    assert (ctx);

    if (!is_ipv6_available ()) {
        zmq_ctx_term (ctx);
        return;
    }

    void *sb = zmq_socket (ctx, ZMQ_REP);
    assert (sb);
    int ipv6 = 1;
    int rc = zmq_setsockopt (sb, ZMQ_IPV6, &ipv6, sizeof (int));
    assert (rc == 0);
    rc = zmq_bind (sb, "tcp://[::1]:5560");
    assert (rc == 0);

    void *sc = zmq_socket (ctx, ZMQ_REQ);
    assert (sc);
    rc = zmq_setsockopt (sc, ZMQ_IPV6, &ipv6, sizeof (int));
    assert (rc == 0);
    rc = zmq_connect (sc, "tcp://[::1]:5560");
    assert (rc == 0);

    bounce (sb, sc);

    rc = zmq_disconnect (sc, "tcp://[::1]:5560");
    assert (rc == 0);

    rc = zmq_unbind (sb, "tcp://[::1]:5560");
    assert (rc == 0);

    rc = zmq_close (sc);
    assert (rc == 0);

    rc = zmq_close (sb);
    assert (rc == 0);

    rc = zmq_ctx_term (ctx);
    assert (rc == 0);
}

void test_multi_connect_ipv6 (void)
{
    void *ctx = zmq_ctx_new ();
    assert (ctx);

    if (!is_ipv6_available ()) {
        zmq_ctx_term (ctx);
        return;
    }

    void *sb0 = zmq_socket (ctx, ZMQ_REP);
    assert (sb0);
    int ipv6 = 1;
    int rc = zmq_setsockopt (sb0, ZMQ_IPV6, &ipv6, sizeof (int));
    assert (rc == 0);
    rc = zmq_bind (sb0, "tcp://[::1]:5560");
    assert (rc == 0);

    void *sb1 = zmq_socket (ctx, ZMQ_REP);
    assert (sb1);
    rc = zmq_setsockopt (sb1, ZMQ_IPV6, &ipv6, sizeof (int));
    assert (rc == 0);
    rc = zmq_bind (sb1, "tcp://[::1]:5561");
    assert (rc == 0);

    void *sb2 = zmq_socket (ctx, ZMQ_REP);
    assert (sb2);
    rc = zmq_setsockopt (sb2, ZMQ_IPV6, &ipv6, sizeof (int));
    assert (rc == 0);
    rc = zmq_bind (sb2, "tcp://[::1]:5562");
    assert (rc == 0);

    void *sc = zmq_socket (ctx, ZMQ_REQ);
    assert (sc);
    rc = zmq_setsockopt (sc, ZMQ_IPV6, &ipv6, sizeof (int));
    assert (rc == 0);
    rc = zmq_connect (sc, "tcp://[::1]:5560");
    assert (rc == 0);
    rc = zmq_connect (sc, "tcp://[::1]:5561");
    assert (rc == 0);
    rc = zmq_connect (sc, "tcp://[::1]:5564;[::1]:5562");
    assert (rc == 0);

    bounce (sb0, sc);
    bounce (sb1, sc);
    bounce (sb2, sc);
    bounce (sb0, sc);
    bounce (sb1, sc);
    bounce (sb2, sc);
    bounce (sb0, sc);

    rc = zmq_disconnect (sc, "tcp://[::1]:5560");
    assert (rc == 0);
    rc = zmq_disconnect (sc, "tcp://[::1]:5564;[::1]:5562");
    assert (rc == 0);
    rc = zmq_disconnect (sc, "tcp://[::1]:5561");
    assert (rc == 0);

    rc = zmq_unbind (sb0, "tcp://[::1]:5560");
    assert (rc == 0);

    rc = zmq_unbind (sb1, "tcp://[::1]:5561");
    assert (rc == 0);

    rc = zmq_unbind (sb2, "tcp://[::1]:5562");
    assert (rc == 0);

    rc = zmq_close (sc);
    assert (rc == 0);

    rc = zmq_close (sb0);
    assert (rc == 0);

    rc = zmq_close (sb1);
    assert (rc == 0);

    rc = zmq_close (sb2);
    assert (rc == 0);

    rc = zmq_ctx_term (ctx);
    assert (rc == 0);
}

int main (void)
{
    setup_test_environment ();

    test_single_connect_ipv4 ();

    test_multi_connect_ipv4 ();

    test_single_connect_ipv6 ();

    test_multi_connect_ipv6 ();

    return 0 ;
}


// Copyright 2015 go-swagger maintainers
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package spec

// ContactInfo contact information for the exposed API.
//
// For more information: http://goo.gl/8us55a#contactObject
type ContactInfo struct {
	Name  string `json:"name,omitempty"`
	URL   string `json:"url,omitempty"`
	Email string `json:"email,omitempty"`
}


/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
"use strict";

const asyncLib = require("async");

class MultiWatching {
	constructor(watchings, compiler) {
		this.watchings = watchings;
		this.compiler = compiler;
	}

	invalidate() {
		this.watchings.forEach((watching) => watching.invalidate());
	}

	close(callback) {
		if(callback === undefined) callback = () => { /*do nothing*/ };

		asyncLib.forEach(this.watchings, (watching, finishedCallback) => {
			watching.close(finishedCallback);
		}, err => {
			this.compiler.applyPlugins("watch-close");
			callback(err);
		});

	}
}

module.exports = MultiWatching;


/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2001 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifndef TagNodeList_h
#define TagNodeList_h

#include "DynamicNodeList.h"
#include <wtf/text/AtomicString.h>

namespace WebCore {

    // NodeList that limits to a particular tag.
    class TagNodeList : public DynamicNodeList {
    public:
        static PassRefPtr<TagNodeList> create(PassRefPtr<Node> rootNode, const AtomicString& namespaceURI, const AtomicString& localName)
        {
            return adoptRef(new TagNodeList(rootNode, namespaceURI, localName));
        }

        virtual ~TagNodeList();

    private:
        TagNodeList(PassRefPtr<Node> rootNode, const AtomicString& namespaceURI, const AtomicString& localName);

        virtual bool nodeMatches(Element*) const;

        AtomicString m_namespaceURI;
        AtomicString m_localName;
    };

} // namespace WebCore

#endif // TagNodeList_h


var baseEach = require('./_baseEach');

/**
 * The base implementation of `_.filter` without support for iteratee shorthands.
 *
 * @private
 * @param {Array|Object} collection The collection to iterate over.
 * @param {Function} predicate The function invoked per iteration.
 * @returns {Array} Returns the new filtered array.
 */
function baseFilter(collection, predicate) {
  var result = [];
  baseEach(collection, function(value, index, collection) {
    if (predicate(value, index, collection)) {
      result.push(value);
    }
  });
  return result;
}

module.exports = baseFilter;


package com.alipay.api.response;

import java.util.List;
import com.alipay.api.internal.mapping.ApiField;
import com.alipay.api.internal.mapping.ApiListField;
import com.alipay.api.domain.PayModeModel;

import com.alipay.api.AlipayResponse;

/**
 * ALIPAY API: koubei.catering.pos.paymode.query response.
 *
 * @author auto create
 * @since 1.0, 2019-01-16 18:35:00
 */
public class KoubeiCateringPosPaymodeQueryResponse extends AlipayResponse {

	private static final long serialVersionUID = 7442381317539413652L;

	/**
	 * 支付方式列表
	 */
	@ApiListField("pay_mode_model_list")
	@ApiField("pay_mode_model")
	private List<PayModeModel> payModeModelList;

	public void setPayModeModelList(List<PayModeModel> payModeModelList) {
		this.payModeModelList = payModeModelList;
	}
	public List<PayModeModel> getPayModeModelList( ) {
		return this.payModeModelList;
	}

}


test_page_test.test_page:
  route_name: test_page_test.test_page
  title: 'Test front page link'
  weight: 0
test_page_test.front_page:
  title: 'Home'
  route_name: '<front>'
  menu_name: main


var inherits = require('util').inherits;
var DuplexStream = require('stream').Duplex;
var ReadableStream = require('stream').Readable;
var WritableStream = require('stream').Writable;

var STDERR = require('ssh2-streams').constants.CHANNEL_EXTENDED_DATATYPE.STDERR;

var PACKET_SIZE = 32 * 1024;
var MAX_WINDOW = 1 * 1024 * 1024;
var WINDOW_THRESHOLD = MAX_WINDOW / 2;
var CUSTOM_EVENTS = [
  'CHANNEL_EOF',
  'CHANNEL_CLOSE',
  'CHANNEL_DATA',
  'CHANNEL_EXTENDED_DATA',
  'CHANNEL_WINDOW_ADJUST',
  'CHANNEL_SUCCESS',
  'CHANNEL_FAILURE',
  'CHANNEL_REQUEST'
];
var CUSTOM_EVENTS_LEN = CUSTOM_EVENTS.length;

function Channel(info, client, opts) {
  var streamOpts = {
    highWaterMark: MAX_WINDOW,
    allowHalfOpen: (!opts || (opts && opts.allowHalfOpen !== false))
  };

  this.allowHalfOpen = streamOpts.allowHalfOpen;

  DuplexStream.call(this, streamOpts);

  var self = this;
  var server = opts && opts.server;

  this.server = server;
  this.type = info.type;
  this.subtype = undefined;
  /*
    incoming and outgoing contain these properties:
    {
      id: undefined,
      window: undefined,
      packetSize: undefined,
      state: 'closed'
    }
  */
  var incoming = this.incoming = info.incoming;
  var incomingId = incoming.id;
  var outgoing = this.outgoing = info.outgoing;
  var callbacks = this._callbacks = [];
  var exitCode;
  var exitSignal;
  var exitDump;
  var exitDesc;
  var exitLang;

  this._client = client;
  this._hasX11 = false;

  var channels = client._channels;
  var sshstream = client._sshstream;

  function ondrain() {
    if (self._waitClientDrain) {
      self._waitClientDrain = false;
      if (!self._waitWindow) {
        if (self._chunk)
          self._write(self._chunk, null, self._chunkcb);
        else if (self._chunkcb)
          self._chunkcb();
        else if (self._chunkErr)
          self.stderr._write(self._chunkErr, null, self._chunkcbErr);
        else if (self._chunkcbErr)
          self._chunkcbErr();
      }
    }
  }
  client._sock.on('drain', ondrain);

  sshstream.once('CHANNEL_EOF:' + incomingId, function() {
    if (incoming.state === 'closed' || incoming.state === 'eof')
      return;
    incoming.state = 'eof';

    if (self.readable)
      self.push(null);
    if (!server && self.stderr.readable)
      self.stderr.push(null);
  }).once('CHANNEL_CLOSE:' + incomingId, function() {
    if (incoming.state === 'closed')
      return;
    incoming.state = 'closed';

    if (self.readable)
      self.push(null);
    if (server && self.stderr.writable)
      self.stderr.end();
    else if (!server && self.stderr.readable)
      self.stderr.push(null);

    if (outgoing.state === 'open' || outgoing.state === 'eof')
      self.close();
    if (outgoing.state === 'closing')
      outgoing.state = 'closed';

    delete channels[incomingId];

    var state = self._writableState;
    client._sock.removeListener('drain', ondrain);
    if (!state.ending && !state.finished)
      self.end();

    // Take care of any outstanding channel requests
    self._callbacks = [];
    for (var i = 0; i < callbacks.length; ++i)
      callbacks[i](true);
    callbacks = self._callbacks;

    if (!server) {
      // align more with node child processes, where the close event gets the
      // same arguments as the exit event
      if (!self.readable) {
        if (exitCode === null) {
          self.emit('close', exitCode, exitSignal, exitDump, exitDesc,
                    exitLang);
        } else
          self.emit('close', exitCode);
      } else {
        self.once('end', function() {
          if (exitCode === null) {
            self.emit('close', exitCode, exitSignal, exitDump, exitDesc,
                      exitLang);
          } else
            self.emit('close', exitCode);
        });
      }

      if (!self.stderr.readable)
        self.stderr.emit('close');
      else {
        self.stderr.once('end', function() {
          self.stderr.emit('close');
        });
      }
    } else { // Server mode
      if (!self.readable)
        self.emit('close');
      else {
        self.once('end', function() {
          self.emit('close');
        });
      }
    }

    for (var i = 0; i < CUSTOM_EVENTS_LEN; ++i)
      sshstream.removeAllListeners(CUSTOM_EVENTS[i] + ':' + incomingId);
  }).on('CHANNEL_DATA:' + incomingId, function(data) {
    // the remote party should not be sending us data if there is no window
    // space available ...
    if (incoming.window === 0)
      return;

    incoming.window -= data.length;

    if (!self.push(data)) {
      self._waitChanDrain = true;
      return;
    }

    if (incoming.window <= WINDOW_THRESHOLD)
      windowAdjust(self);
  }).on('CHANNEL_WINDOW_ADJUST:' + incomingId, function(amt) {
    // the server is allowing us to send `amt` more bytes of data
    outgoing.window += amt;

    if (self._waitWindow) {
      self._waitWindow = false;
      if (!self._waitClientDrain) {
        if (self._chunk)
          self._write(self._chunk, null, self._chunkcb);
        else if (self._chunkcb)
          self._chunkcb();
        else if (self._chunkErr)
          self.stderr._write(self._chunkErr, null, self._chunkcbErr);
        else if (self._chunkcbErr)
          self._chunkcbErr();
      }
    }
  }).on('CHANNEL_SUCCESS:' + incomingId, function() {
    if (server) {
      sshstream._kalast = Date.now();
      sshstream._kacnt = 0;
    } else
      client._resetKA();
    if (callbacks.length)
      callbacks.shift()(false);
  }).on('CHANNEL_FAILURE:' + incomingId, function() {
    if (server) {
      sshstream._kalast = Date.now();
      sshstream._kacnt = 0;
    } else
      client._resetKA();
    if (callbacks.length)
      callbacks.shift()(true);
  }).on('CHANNEL_REQUEST:' + incomingId, function(info) {
    if (!server) {
      if (info.request === 'exit-status') {
        self.emit('exit', exitCode = info.code);
        return;
      } else if (info.request === 'exit-signal') {
        self.emit('exit',
                  exitCode = null,
                  exitSignal = 'SIG' + info.signal,
                  exitDump = info.coredump,
                  exitDesc = info.description,
                  exitLang = info.lang);
        return;
      }
    }

    // keepalive request? OpenSSH will send one as a channel request if there
    // is a channel open

    if (info.wantReply)
      sshstream.channelFailure(outgoing.id);
  });

  this.stdin = this.stdout = this;

  if (server)
    this.stderr = new ServerStderr(this);
  else {
    this.stderr = new ReadableStream(streamOpts);
    this.stderr._read = function(n) {
      if (self._waitChanDrain) {
        self._waitChanDrain = false;
        if (incoming.window <= WINDOW_THRESHOLD)
          windowAdjust(self);
      }
    };

    sshstream.on('CHANNEL_EXTENDED_DATA:' + incomingId,
      function(type, data) {
        // the remote party should not be sending us data if there is no window
        // space available ...
        if (incoming.window === 0)
          return;

        incoming.window -= data.length;

        if (!self.stderr.push(data)) {
          self._waitChanDrain = true;
          return;
        }

        if (incoming.window <= WINDOW_THRESHOLD)
          windowAdjust(self);
      }
    );
  }

  // outgoing data
  this._waitClientDrain = false; // Client stream-level backpressure
  this._waitWindow = false; // SSH-level backpressure

  // incoming data
  this._waitChanDrain = false; // Channel Readable side backpressure

  this._chunk = undefined;
  this._chunkcb = undefined;
  this._chunkErr = undefined;
  this._chunkcbErr = undefined;

  function onFinish() {
    self.eof();
    if (server || (!server && !self.allowHalfOpen))
      self.close();
    self.writable = false;
  }
  this.on('finish', onFinish)
      .on('prefinish', onFinish); // for node v0.11+
  function onEnd() {
    self.readable = false;
  }
  this.on('end', onEnd)
      .on('close', onEnd);
}
inherits(Channel, DuplexStream);

Channel.prototype.eof = function() {
  var ret = true;
  var outgoing = this.outgoing;

  if (outgoing.state === 'open') {
    outgoing.state = 'eof';
    ret = this._client._sshstream.channelEOF(outgoing.id);
  }

  return ret;
};

Channel.prototype.close = function() {
  var ret = true;
  var outgoing = this.outgoing;

  if (outgoing.state === 'open' || outgoing.state === 'eof') {
    outgoing.state = 'closing';
    ret = this._client._sshstream.channelClose(outgoing.id);
  }

  return ret;
};

Channel.prototype._read = function(n) {
  if (this._waitChanDrain) {
    this._waitChanDrain = false;
    if (this.incoming.window <= WINDOW_THRESHOLD)
      windowAdjust(this);
  }
};

Channel.prototype._write = function(data, encoding, cb) {
  var sshstream = this._client._sshstream;
  var outgoing = this.outgoing;
  var packetSize = outgoing.packetSize;
  var id = outgoing.id;
  var window = outgoing.window;
  var len = data.length;
  var p = 0;
  var ret;
  var buf;
  var sliceLen;

  if (outgoing.state !== 'open')
    return;

  while (len - p > 0 && window > 0) {
    sliceLen = len - p;
    if (sliceLen > window)
      sliceLen = window;
    if (sliceLen > packetSize)
      sliceLen = packetSize;

    ret = sshstream.channelData(id, data.slice(p, p + sliceLen));

    p += sliceLen;
    window -= sliceLen;

    if (!ret) {
      this._waitClientDrain = true;
      this._chunk = undefined;
      this._chunkcb = cb;
      break;
    }
  }

  outgoing.window = window;

  if (len - p > 0) {
    if (window === 0)
      this._waitWindow = true;
    if (p > 0) {
      // partial
      buf = new Buffer(len - p);
      data.copy(buf, 0, p);
      this._chunk = buf;
    } else
      this._chunk = data;
    this._chunkcb = cb;
    return;
  }

  if (!this._waitClientDrain)
    cb();
};

Channel.prototype.destroy = function() {
  this.end();
};

// session type-specific methods
Channel.prototype.setWindow = function(rows, cols, height, width) {
  if (this.server)
    throw new Error('Client-only method called in server mode');

  if (this.type === 'session'
      && (this.subtype === 'shell' || this.subtype === 'exec')
      && this.writable
      && this.outgoing.state === 'open') {
    return this._client._sshstream.windowChange(this.outgoing.id,
                                                rows,
                                                cols,
                                                height,
                                                width);
  }

  return true;
};
Channel.prototype.signal = function(signalName) {
  if (this.server)
    throw new Error('Client-only method called in server mode');

  if (this.type === 'session'
      && this.writable
      && this.outgoing.state === 'open')
    return this._client._sshstream.signal(this.outgoing.id, signalName);

  return true;
};
Channel.prototype.exit = function(name, coreDumped, msg) {
  if (!this.server)
    throw new Error('Server-only method called in client mode');

  if (this.type === 'session'
      && this.writable
      && this.outgoing.state === 'open') {
    if (typeof name === 'number')
      return this._client._sshstream.exitStatus(this.outgoing.id, name);
    else {
      return this._client._sshstream.exitSignal(this.outgoing.id,
                                                name,
                                                coreDumped,
                                                msg);
    }
  }

  return true;
};

Channel.MAX_WINDOW = MAX_WINDOW;
Channel.PACKET_SIZE = PACKET_SIZE;

function windowAdjust(self) {
  if (self.outgoing.state !== 'open')
    return true;
  var amt = MAX_WINDOW - self.incoming.window;
  if (amt <= 0)
    return true;
  self.incoming.window += amt;
  return self._client._sshstream.channelWindowAdjust(self.outgoing.id, amt);
}

function ServerStderr(channel) {
  WritableStream.call(this, { highWaterMark: MAX_WINDOW });
  this._channel = channel;
}
inherits(ServerStderr, WritableStream);

ServerStderr.prototype._write = function(data, encoding, cb) {
  var channel = this._channel;
  var sshstream = channel._client._sshstream;
  var outgoing = channel.outgoing;
  var packetSize = outgoing.packetSize;
  var id = outgoing.id;
  var window = outgoing.window;
  var len = data.length;
  var p = 0;
  var ret;
  var buf;
  var sliceLen;

  if (channel.outgoing.state !== 'open')
    return;

  while (len - p > 0 && window > 0) {
    sliceLen = len - p;
    if (sliceLen > window)
      sliceLen = window;
    if (sliceLen > packetSize)
      sliceLen = packetSize;

    ret = sshstream.channelExtData(id, data.slice(p, p + sliceLen), STDERR);

    p += sliceLen;
    window -= sliceLen;

    if (!ret) {
      channel._waitClientDrain = true;
      channel._chunkErr = undefined;
      channel._chunkcbErr = cb;
      break;
    }
  }

  outgoing.window = window;

  if (len - p > 0) {
    if (window === 0)
      channel._waitWindow = true;
    if (p > 0) {
      // partial
      buf = new Buffer(len - p);
      data.copy(buf, 0, p);
      channel._chunkErr = buf;
    } else
      channel._chunkErr = data;
    channel._chunkcbErr = cb;
    return;
  }

  if (!channel._waitClientDrain)
    cb();
};

module.exports = Channel;


int glui_img_checkbox_0_dis[] = {    13, 13,   /* width, height */
    255,255,255,  255,255,255,  255,255,255,  255,255,255,  255,255,255,
    255,255,255,  255,255,255,  255,255,255,  255,255,255,  255,255,255,
    255,255,255,  255,255,255,  255,255,255,  128,128,128,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    255,255,255,  128,128,128,   64, 64, 64,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  255,255,255,  128,128,128,
     64, 64, 64,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  255,255,255,  128,128,128,   64, 64, 64,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  255,255,255,
    128,128,128,   64, 64, 64,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  255,255,255,  128,128,128,   64, 64, 64,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    255,255,255,  128,128,128,   64, 64, 64,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  255,255,255,  128,128,128,
     64, 64, 64,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  255,255,255,  128,128,128,   64, 64, 64,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  255,255,255,
    128,128,128,   64, 64, 64,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  192,192,192,  192,192,192,  192,192,192,
    192,192,192,  192,192,192,  255,255,255,  128,128,128,   64, 64, 64,
     64, 64, 64,   64, 64, 64,   64, 64, 64,   64, 64, 64,   64, 64, 64,
     64, 64, 64,   64, 64, 64,   64, 64, 64,   64, 64, 64,  192,192,192,
    255,255,255,  128,128,128,  128,128,128,  128,128,128,  128,128,128,
    128,128,128,  128,128,128,  128,128,128,  128,128,128,  128,128,128,
    128,128,128,  128,128,128,  128,128,128,  255,255,255,
};


(function(root) {

    "use strict";

    var Models = root.App.Models,
        Collections = root.App.Collections,
        TimeOffRequests = Collections.Base.extend({
            model: Models.TimeOffRequest,
            endpoint: function() {
                var self = this,
                    locationId = self.getUpstreamModelId("locationId"),
                    roleId = self.getUpstreamModelId("roleId"),
                    userId = self.getUpstreamModelId("userId")
                ;

                return "locations/" + locationId + "/roles/" + roleId + "/users/" + userId + "/timeoffrequests/" + self.getParams();
            },
            parse: function(response) {
                return response.data;
            },
        })
    ;

    root.App.Collections.TimeOffRequests = TimeOffRequests;
})(this);


# coding: utf-8
from __future__ import unicode_literals, division, absolute_import, print_function

import ctypes
from ctypes import windll, wintypes, POINTER, c_longlong, Structure

from .._ffi import FFIEngineError
from .._types import str_cls
from ..errors import LibraryNotFoundError

__all__ = [
    'get_error',
    'kernel32',
]

try:
    kernel32 = windll.kernel32
except (OSError) as e:
    if str_cls(e).find('The specified module could not be found') != -1:
        raise LibraryNotFoundError('kernel32.dll could not be found')
    raise

LARGE_INTEGER = c_longlong

try:
    kernel32.QueryPerformanceCounter.argtypes = [POINTER(LARGE_INTEGER)]
    kernel32.QueryPerformanceCounter.restype = wintypes.BOOL

    class FILETIME(Structure):
        _fields_ = [
            ("dwLowDateTime", wintypes.DWORD),
            ("dwHighDateTime", wintypes.DWORD),
        ]

    kernel32.GetSystemTimeAsFileTime.argtypes = [POINTER(FILETIME)]
    kernel32.GetSystemTimeAsFileTime.restype = None

except (AttributeError):
    raise FFIEngineError('Error initializing ctypes')

setattr(kernel32, 'LARGE_INTEGER', LARGE_INTEGER)
setattr(kernel32, 'FILETIME', FILETIME)

def get_error():
    error = ctypes.GetLastError()
    return (error, ctypes.FormatError(error))


/*
 * Memory merging support.
 *
 * This code enables dynamic sharing of identical pages found in different
 * memory areas, even if they are not shared by fork()
 *
 * Copyright (C) 2008-2009 Red Hat, Inc.
 * Authors:
 *	Izik Eidus
 *	Andrea Arcangeli
 *	Chris Wright
 *	Hugh Dickins
 *
 * This work is licensed under the terms of the GNU GPL, version 2.
 */

#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/mman.h>
#include <linux/sched.h>
#include <linux/rwsem.h>
#include <linux/pagemap.h>
#include <linux/rmap.h>
#include <linux/spinlock.h>
#include <linux/jhash.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/rbtree.h>
#include <linux/memory.h>
#include <linux/mmu_notifier.h>
#include <linux/swap.h>
#include <linux/ksm.h>
#include <linux/hashtable.h>
#include <linux/freezer.h>
#include <linux/oom.h>
#include <linux/numa.h>

#include <asm/tlbflush.h>
#include "internal.h"

#ifdef CONFIG_NUMA
#define NUMA(x)		(x)
#define DO_NUMA(x)	do { (x); } while (0)
#else
#define NUMA(x)		(0)
#define DO_NUMA(x)	do { } while (0)
#endif

/*
 * A few notes about the KSM scanning process,
 * to make it easier to understand the data structures below:
 *
 * In order to reduce excessive scanning, KSM sorts the memory pages by their
 * contents into a data structure that holds pointers to the pages' locations.
 *
 * Since the contents of the pages may change at any moment, KSM cannot just
 * insert the pages into a normal sorted tree and expect it to find anything.
 * Therefore KSM uses two data structures - the stable and the unstable tree.
 *
 * The stable tree holds pointers to all the merged pages (ksm pages), sorted
 * by their contents.  Because each such page is write-protected, searching on
 * this tree is fully assured to be working (except when pages are unmapped),
 * and therefore this tree is called the stable tree.
 *
 * In addition to the stable tree, KSM uses a second data structure called the
 * unstable tree: this tree holds pointers to pages which have been found to
 * be "unchanged for a period of time".  The unstable tree sorts these pages
 * by their contents, but since they are not write-protected, KSM cannot rely
 * upon the unstable tree to work correctly - the unstable tree is liable to
 * be corrupted as its contents are modified, and so it is called unstable.
 *
 * KSM solves this problem by several techniques:
 *
 * 1) The unstable tree is flushed every time KSM completes scanning all
 *    memory areas, and then the tree is rebuilt again from the beginning.
 * 2) KSM will only insert into the unstable tree, pages whose hash value
 *    has not changed since the previous scan of all memory areas.
 * 3) The unstable tree is a RedBlack Tree - so its balancing is based on the
 *    colors of the nodes and not on their contents, assuring that even when
 *    the tree gets "corrupted" it won't get out of balance, so scanning time
 *    remains the same (also, searching and inserting nodes in an rbtree uses
 *    the same algorithm, so we have no overhead when we flush and rebuild).
 * 4) KSM never flushes the stable tree, which means that even if it were to
 *    take 10 attempts to find a page in the unstable tree, once it is found,
 *    it is secured in the stable tree.  (When we scan a new page, we first
 *    compare it against the stable tree, and then against the unstable tree.)
 *
 * If the merge_across_nodes tunable is unset, then KSM maintains multiple
 * stable trees and multiple unstable trees: one of each for each NUMA node.
 */

/**
 * struct mm_slot - ksm information per mm that is being scanned
 * @link: link to the mm_slots hash list
 * @mm_list: link into the mm_slots list, rooted in ksm_mm_head
 * @rmap_list: head for this mm_slot's singly-linked list of rmap_items
 * @mm: the mm that this information is valid for
 */
struct mm_slot {
	struct hlist_node link;
	struct list_head mm_list;
	struct rmap_item *rmap_list;
	struct mm_struct *mm;
};

/**
 * struct ksm_scan - cursor for scanning
 * @mm_slot: the current mm_slot we are scanning
 * @address: the next address inside that to be scanned
 * @rmap_list: link to the next rmap to be scanned in the rmap_list
 * @seqnr: count of completed full scans (needed when removing unstable node)
 *
 * There is only the one ksm_scan instance of this cursor structure.
 */
struct ksm_scan {
	struct mm_slot *mm_slot;
	unsigned long address;
	struct rmap_item **rmap_list;
	unsigned long seqnr;
};

/**
 * struct stable_node - node of the stable rbtree
 * @node: rb node of this ksm page in the stable tree
 * @head: (overlaying parent) &migrate_nodes indicates temporarily on that list
 * @list: linked into migrate_nodes, pending placement in the proper node tree
 * @hlist: hlist head of rmap_items using this ksm page
 * @kpfn: page frame number of this ksm page (perhaps temporarily on wrong nid)
 * @nid: NUMA node id of stable tree in which linked (may not match kpfn)
 */
struct stable_node {
	union {
		struct rb_node node;	/* when node of stable tree */
		struct {		/* when listed for migration */
			struct list_head *head;
			struct list_head list;
		};
	};
	struct hlist_head hlist;
	unsigned long kpfn;
#ifdef CONFIG_NUMA
	int nid;
#endif
};

/**
 * struct rmap_item - reverse mapping item for virtual addresses
 * @rmap_list: next rmap_item in mm_slot's singly-linked rmap_list
 * @anon_vma: pointer to anon_vma for this mm,address, when in stable tree
 * @nid: NUMA node id of unstable tree in which linked (may not match page)
 * @mm: the memory structure this rmap_item is pointing into
 * @address: the virtual address this rmap_item tracks (+ flags in low bits)
 * @oldchecksum: previous checksum of the page at that virtual address
 * @node: rb node of this rmap_item in the unstable tree
 * @head: pointer to stable_node heading this list in the stable tree
 * @hlist: link into hlist of rmap_items hanging off that stable_node
 */
struct rmap_item {
	struct rmap_item *rmap_list;
	union {
		struct anon_vma *anon_vma;	/* when stable */
#ifdef CONFIG_NUMA
		int nid;		/* when node of unstable tree */
#endif
	};
	struct mm_struct *mm;
	unsigned long address;		/* + low bits used for flags below */
	unsigned int oldchecksum;	/* when unstable */
	union {
		struct rb_node node;	/* when node of unstable tree */
		struct {		/* when listed from stable tree */
			struct stable_node *head;
			struct hlist_node hlist;
		};
	};
};

#define SEQNR_MASK	0x0ff	/* low bits of unstable tree seqnr */
#define UNSTABLE_FLAG	0x100	/* is a node of the unstable tree */
#define STABLE_FLAG	0x200	/* is listed from the stable tree */

/* The stable and unstable tree heads */
static struct rb_root one_stable_tree[1] = { RB_ROOT };
static struct rb_root one_unstable_tree[1] = { RB_ROOT };
static struct rb_root *root_stable_tree = one_stable_tree;
static struct rb_root *root_unstable_tree = one_unstable_tree;

/* Recently migrated nodes of stable tree, pending proper placement */
static LIST_HEAD(migrate_nodes);

#define MM_SLOTS_HASH_BITS 10
static DEFINE_HASHTABLE(mm_slots_hash, MM_SLOTS_HASH_BITS);

static struct mm_slot ksm_mm_head = {
	.mm_list = LIST_HEAD_INIT(ksm_mm_head.mm_list),
};
static struct ksm_scan ksm_scan = {
	.mm_slot = &ksm_mm_head,
};

static struct kmem_cache *rmap_item_cache;
static struct kmem_cache *stable_node_cache;
static struct kmem_cache *mm_slot_cache;

/* The number of nodes in the stable tree */
static unsigned long ksm_pages_shared;

/* The number of page slots additionally sharing those nodes */
static unsigned long ksm_pages_sharing;

/* The number of nodes in the unstable tree */
static unsigned long ksm_pages_unshared;

/* The number of rmap_items in use: to calculate pages_volatile */
static unsigned long ksm_rmap_items;

/* Number of pages ksmd should scan in one batch */
static unsigned int ksm_thread_pages_to_scan = 100;

/* Milliseconds ksmd should sleep between batches */
static unsigned int ksm_thread_sleep_millisecs = 20;

#ifdef CONFIG_NUMA
/* Zeroed when merging across nodes is not allowed */
static unsigned int ksm_merge_across_nodes = 1;
static int ksm_nr_node_ids = 1;
#else
#define ksm_merge_across_nodes	1U
#define ksm_nr_node_ids		1
#endif

#define KSM_RUN_STOP	0
#define KSM_RUN_MERGE	1
#define KSM_RUN_UNMERGE	2
#define KSM_RUN_OFFLINE	4
static unsigned long ksm_run = KSM_RUN_STOP;
static void wait_while_offlining(void);

static DECLARE_WAIT_QUEUE_HEAD(ksm_thread_wait);
static DEFINE_MUTEX(ksm_thread_mutex);
static DEFINE_SPINLOCK(ksm_mmlist_lock);

#define KSM_KMEM_CACHE(__struct, __flags) kmem_cache_create("ksm_"#__struct,\
		sizeof(struct __struct), __alignof__(struct __struct),\
		(__flags), NULL)

static int __init ksm_slab_init(void)
{
	rmap_item_cache = KSM_KMEM_CACHE(rmap_item, 0);
	if (!rmap_item_cache)
		goto out;

	stable_node_cache = KSM_KMEM_CACHE(stable_node, 0);
	if (!stable_node_cache)
		goto out_free1;

	mm_slot_cache = KSM_KMEM_CACHE(mm_slot, 0);
	if (!mm_slot_cache)
		goto out_free2;

	return 0;

out_free2:
	kmem_cache_destroy(stable_node_cache);
out_free1:
	kmem_cache_destroy(rmap_item_cache);
out:
	return -ENOMEM;
}

static void __init ksm_slab_free(void)
{
	kmem_cache_destroy(mm_slot_cache);
	kmem_cache_destroy(stable_node_cache);
	kmem_cache_destroy(rmap_item_cache);
	mm_slot_cache = NULL;
}

static inline struct rmap_item *alloc_rmap_item(void)
{
	struct rmap_item *rmap_item;

	rmap_item = kmem_cache_zalloc(rmap_item_cache, GFP_KERNEL |
						__GFP_NORETRY | __GFP_NOWARN);
	if (rmap_item)
		ksm_rmap_items++;
	return rmap_item;
}

static inline void free_rmap_item(struct rmap_item *rmap_item)
{
	ksm_rmap_items--;
	rmap_item->mm = NULL;	/* debug safety */
	kmem_cache_free(rmap_item_cache, rmap_item);
}

static inline struct stable_node *alloc_stable_node(void)
{
	/*
	 * The allocation can take too long with GFP_KERNEL when memory is under
	 * pressure, which may lead to hung task warnings.  Adding __GFP_HIGH
	 * grants access to memory reserves, helping to avoid this problem.
	 */
	return kmem_cache_alloc(stable_node_cache, GFP_KERNEL | __GFP_HIGH);
}

static inline void free_stable_node(struct stable_node *stable_node)
{
	kmem_cache_free(stable_node_cache, stable_node);
}

static inline struct mm_slot *alloc_mm_slot(void)
{
	if (!mm_slot_cache)	/* initialization failed */
		return NULL;
	return kmem_cache_zalloc(mm_slot_cache, GFP_KERNEL);
}

static inline void free_mm_slot(struct mm_slot *mm_slot)
{
	kmem_cache_free(mm_slot_cache, mm_slot);
}

static struct mm_slot *get_mm_slot(struct mm_struct *mm)
{
	struct mm_slot *slot;

	hash_for_each_possible(mm_slots_hash, slot, link, (unsigned long)mm)
		if (slot->mm == mm)
			return slot;

	return NULL;
}

static void insert_to_mm_slots_hash(struct mm_struct *mm,
				    struct mm_slot *mm_slot)
{
	mm_slot->mm = mm;
	hash_add(mm_slots_hash, &mm_slot->link, (unsigned long)mm);
}

/*
 * ksmd, and unmerge_and_remove_all_rmap_items(), must not touch an mm's
 * page tables after it has passed through ksm_exit() - which, if necessary,
 * takes mmap_sem briefly to serialize against them.  ksm_exit() does not set
 * a special flag: they can just back out as soon as mm_users goes to zero.
 * ksm_test_exit() is used throughout to make this test for exit: in some
 * places for correctness, in some places just to avoid unnecessary work.
 */
static inline bool ksm_test_exit(struct mm_struct *mm)
{
	return atomic_read(&mm->mm_users) == 0;
}

/*
 * We use break_ksm to break COW on a ksm page: it's a stripped down
 *
 *	if (get_user_pages(addr, 1, 1, 1, &page, NULL) == 1)
 *		put_page(page);
 *
 * but taking great care only to touch a ksm page, in a VM_MERGEABLE vma,
 * in case the application has unmapped and remapped mm,addr meanwhile.
 * Could a ksm page appear anywhere else?  Actually yes, in a VM_PFNMAP
 * mmap of /dev/mem or /dev/kmem, where we would not want to touch it.
 *
 * FAULT_FLAG/FOLL_REMOTE are because we do this outside the context
 * of the process that owns 'vma'.  We also do not want to enforce
 * protection keys here anyway.
 */
static int break_ksm(struct vm_area_struct *vma, unsigned long addr)
{
	struct page *page;
	int ret = 0;

	do {
		cond_resched();
		page = follow_page(vma, addr,
				FOLL_GET | FOLL_MIGRATION | FOLL_REMOTE);
		if (IS_ERR_OR_NULL(page))
			break;
		if (PageKsm(page))
			ret = handle_mm_fault(vma, addr,
					FAULT_FLAG_WRITE | FAULT_FLAG_REMOTE);
		else
			ret = VM_FAULT_WRITE;
		put_page(page);
	} while (!(ret & (VM_FAULT_WRITE | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | VM_FAULT_OOM)));
	/*
	 * We must loop because handle_mm_fault() may back out if there's
	 * any difficulty e.g. if pte accessed bit gets updated concurrently.
	 *
	 * VM_FAULT_WRITE is what we have been hoping for: it indicates that
	 * COW has been broken, even if the vma does not permit VM_WRITE;
	 * but note that a concurrent fault might break PageKsm for us.
	 *
	 * VM_FAULT_SIGBUS could occur if we race with truncation of the
	 * backing file, which also invalidates anonymous pages: that's
	 * okay, that truncation will have unmapped the PageKsm for us.
	 *
	 * VM_FAULT_OOM: at the time of writing (late July 2009), setting
	 * aside mem_cgroup limits, VM_FAULT_OOM would only be set if the
	 * current task has TIF_MEMDIE set, and will be OOM killed on return
	 * to user; and ksmd, having no mm, would never be chosen for that.
	 *
	 * But if the mm is in a limited mem_cgroup, then the fault may fail
	 * with VM_FAULT_OOM even if the current task is not TIF_MEMDIE; and
	 * even ksmd can fail in this way - though it's usually breaking ksm
	 * just to undo a merge it made a moment before, so unlikely to oom.
	 *
	 * That's a pity: we might therefore have more kernel pages allocated
	 * than we're counting as nodes in the stable tree; but ksm_do_scan
	 * will retry to break_cow on each pass, so should recover the page
	 * in due course.  The important thing is to not let VM_MERGEABLE
	 * be cleared while any such pages might remain in the area.
	 */
	return (ret & VM_FAULT_OOM) ? -ENOMEM : 0;
}

static struct vm_area_struct *find_mergeable_vma(struct mm_struct *mm,
		unsigned long addr)
{
	struct vm_area_struct *vma;
	if (ksm_test_exit(mm))
		return NULL;
	vma = find_vma(mm, addr);
	if (!vma || vma->vm_start > addr)
		return NULL;
	if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
		return NULL;
	return vma;
}

static void break_cow(struct rmap_item *rmap_item)
{
	struct mm_struct *mm = rmap_item->mm;
	unsigned long addr = rmap_item->address;
	struct vm_area_struct *vma;

	/*
	 * It is not an accident that whenever we want to break COW
	 * to undo, we also need to drop a reference to the anon_vma.
	 */
	put_anon_vma(rmap_item->anon_vma);

	down_read(&mm->mmap_sem);
	vma = find_mergeable_vma(mm, addr);
	if (vma)
		break_ksm(vma, addr);
	up_read(&mm->mmap_sem);
}

static struct page *get_mergeable_page(struct rmap_item *rmap_item)
{
	struct mm_struct *mm = rmap_item->mm;
	unsigned long addr = rmap_item->address;
	struct vm_area_struct *vma;
	struct page *page;

	down_read(&mm->mmap_sem);
	vma = find_mergeable_vma(mm, addr);
	if (!vma)
		goto out;

	page = follow_page(vma, addr, FOLL_GET);
	if (IS_ERR_OR_NULL(page))
		goto out;
	if (PageAnon(page)) {
		flush_anon_page(vma, page, addr);
		flush_dcache_page(page);
	} else {
		put_page(page);
out:
		page = NULL;
	}
	up_read(&mm->mmap_sem);
	return page;
}

/*
 * This helper is used for getting right index into array of tree roots.
 * When merge_across_nodes knob is set to 1, there are only two rb-trees for
 * stable and unstable pages from all nodes with roots in index 0. Otherwise,
 * every node has its own stable and unstable tree.
 */
static inline int get_kpfn_nid(unsigned long kpfn)
{
	return ksm_merge_across_nodes ? 0 : NUMA(pfn_to_nid(kpfn));
}

static void remove_node_from_stable_tree(struct stable_node *stable_node)
{
	struct rmap_item *rmap_item;

	hlist_for_each_entry(rmap_item, &stable_node->hlist, hlist) {
		if (rmap_item->hlist.next)
			ksm_pages_sharing--;
		else
			ksm_pages_shared--;
		put_anon_vma(rmap_item->anon_vma);
		rmap_item->address &= PAGE_MASK;
		cond_resched();
	}

	if (stable_node->head == &migrate_nodes)
		list_del(&stable_node->list);
	else
		rb_erase(&stable_node->node,
			 root_stable_tree + NUMA(stable_node->nid));
	free_stable_node(stable_node);
}

/*
 * get_ksm_page: checks if the page indicated by the stable node
 * is still its ksm page, despite having held no reference to it.
 * In which case we can trust the content of the page, and it
 * returns the gotten page; but if the page has now been zapped,
 * remove the stale node from the stable tree and return NULL.
 * But beware, the stable node's page might be being migrated.
 *
 * You would expect the stable_node to hold a reference to the ksm page.
 * But if it increments the page's count, swapping out has to wait for
 * ksmd to come around again before it can free the page, which may take
 * seconds or even minutes: much too unresponsive.  So instead we use a
 * "keyhole reference": access to the ksm page from the stable node peeps
 * out through its keyhole to see if that page still holds the right key,
 * pointing back to this stable node.  This relies on freeing a PageAnon
 * page to reset its page->mapping to NULL, and relies on no other use of
 * a page to put something that might look like our key in page->mapping.
 * is on its way to being freed; but it is an anomaly to bear in mind.
 */
static struct page *get_ksm_page(struct stable_node *stable_node, bool lock_it)
{
	struct page *page;
	void *expected_mapping;
	unsigned long kpfn;

	expected_mapping = (void *)((unsigned long)stable_node |
					PAGE_MAPPING_KSM);
again:
	kpfn = READ_ONCE(stable_node->kpfn);
	page = pfn_to_page(kpfn);

	/*
	 * page is computed from kpfn, so on most architectures reading
	 * page->mapping is naturally ordered after reading node->kpfn,
	 * but on Alpha we need to be more careful.
	 */
	smp_read_barrier_depends();
	if (READ_ONCE(page->mapping) != expected_mapping)
		goto stale;

	/*
	 * We cannot do anything with the page while its refcount is 0.
	 * Usually 0 means free, or tail of a higher-order page: in which
	 * case this node is no longer referenced, and should be freed;
	 * however, it might mean that the page is under page_freeze_refs().
	 * The __remove_mapping() case is easy, again the node is now stale;
	 * but if page is swapcache in migrate_page_move_mapping(), it might
	 * still be our page, in which case it's essential to keep the node.
	 */
	while (!get_page_unless_zero(page)) {
		/*
		 * Another check for page->mapping != expected_mapping would
		 * work here too.  We have chosen the !PageSwapCache test to
		 * optimize the common case, when the page is or is about to
		 * be freed: PageSwapCache is cleared (under spin_lock_irq)
		 * in the freeze_refs section of __remove_mapping(); but Anon
		 * page->mapping reset to NULL later, in free_pages_prepare().
		 */
		if (!PageSwapCache(page))
			goto stale;
		cpu_relax();
	}

	if (READ_ONCE(page->mapping) != expected_mapping) {
		put_page(page);
		goto stale;
	}

	if (lock_it) {
		lock_page(page);
		if (READ_ONCE(page->mapping) != expected_mapping) {
			unlock_page(page);
			put_page(page);
			goto stale;
		}
	}
	return page;

stale:
	/*
	 * We come here from above when page->mapping or !PageSwapCache
	 * suggests that the node is stale; but it might be under migration.
	 * We need smp_rmb(), matching the smp_wmb() in ksm_migrate_page(),
	 * before checking whether node->kpfn has been changed.
	 */
	smp_rmb();
	if (READ_ONCE(stable_node->kpfn) != kpfn)
		goto again;
	remove_node_from_stable_tree(stable_node);
	return NULL;
}

/*
 * Removing rmap_item from stable or unstable tree.
 * This function will clean the information from the stable/unstable tree.
 */
static void remove_rmap_item_from_tree(struct rmap_item *rmap_item)
{
	if (rmap_item->address & STABLE_FLAG) {
		struct stable_node *stable_node;
		struct page *page;

		stable_node = rmap_item->head;
		page = get_ksm_page(stable_node, true);
		if (!page)
			goto out;

		hlist_del(&rmap_item->hlist);
		unlock_page(page);
		put_page(page);

		if (!hlist_empty(&stable_node->hlist))
			ksm_pages_sharing--;
		else
			ksm_pages_shared--;

		put_anon_vma(rmap_item->anon_vma);
		rmap_item->address &= PAGE_MASK;

	} else if (rmap_item->address & UNSTABLE_FLAG) {
		unsigned char age;
		/*
		 * Usually ksmd can and must skip the rb_erase, because
		 * root_unstable_tree was already reset to RB_ROOT.
		 * But be careful when an mm is exiting: do the rb_erase
		 * if this rmap_item was inserted by this scan, rather
		 * than left over from before.
		 */
		age = (unsigned char)(ksm_scan.seqnr - rmap_item->address);
		BUG_ON(age > 1);
		if (!age)
			rb_erase(&rmap_item->node,
				 root_unstable_tree + NUMA(rmap_item->nid));
		ksm_pages_unshared--;
		rmap_item->address &= PAGE_MASK;
	}
out:
	cond_resched();		/* we're called from many long loops */
}

static void remove_trailing_rmap_items(struct mm_slot *mm_slot,
				       struct rmap_item **rmap_list)
{
	while (*rmap_list) {
		struct rmap_item *rmap_item = *rmap_list;
		*rmap_list = rmap_item->rmap_list;
		remove_rmap_item_from_tree(rmap_item);
		free_rmap_item(rmap_item);
	}
}

/*
 * Though it's very tempting to unmerge rmap_items from stable tree rather
 * than check every pte of a given vma, the locking doesn't quite work for
 * that - an rmap_item is assigned to the stable tree after inserting ksm
 * page and upping mmap_sem.  Nor does it fit with the way we skip dup'ing
 * rmap_items from parent to child at fork time (so as not to waste time
 * if exit comes before the next scan reaches it).
 *
 * Similarly, although we'd like to remove rmap_items (so updating counts
 * and freeing memory) when unmerging an area, it's easier to leave that
 * to the next pass of ksmd - consider, for example, how ksmd might be
 * in cmp_and_merge_page on one of the rmap_items we would be removing.
 */
static int unmerge_ksm_pages(struct vm_area_struct *vma,
			     unsigned long start, unsigned long end)
{
	unsigned long addr;
	int err = 0;

	for (addr = start; addr < end && !err; addr += PAGE_SIZE) {
		if (ksm_test_exit(vma->vm_mm))
			break;
		if (signal_pending(current))
			err = -ERESTARTSYS;
		else
			err = break_ksm(vma, addr);
	}
	return err;
}

#ifdef CONFIG_SYSFS
/*
 * Only called through the sysfs control interface:
 */
static int remove_stable_node(struct stable_node *stable_node)
{
	struct page *page;
	int err;

	page = get_ksm_page(stable_node, true);
	if (!page) {
		/*
		 * get_ksm_page did remove_node_from_stable_tree itself.
		 */
		return 0;
	}

	if (WARN_ON_ONCE(page_mapped(page))) {
		/*
		 * This should not happen: but if it does, just refuse to let
		 * merge_across_nodes be switched - there is no need to panic.
		 */
		err = -EBUSY;
	} else {
		/*
		 * The stable node did not yet appear stale to get_ksm_page(),
		 * since that allows for an unmapped ksm page to be recognized
		 * right up until it is freed; but the node is safe to remove.
		 * This page might be in a pagevec waiting to be freed,
		 * or it might be PageSwapCache (perhaps under writeback),
		 * or it might have been removed from swapcache a moment ago.
		 */
		set_page_stable_node(page, NULL);
		remove_node_from_stable_tree(stable_node);
		err = 0;
	}

	unlock_page(page);
	put_page(page);
	return err;
}

static int remove_all_stable_nodes(void)
{
	struct stable_node *stable_node, *next;
	int nid;
	int err = 0;

	for (nid = 0; nid < ksm_nr_node_ids; nid++) {
		while (root_stable_tree[nid].rb_node) {
			stable_node = rb_entry(root_stable_tree[nid].rb_node,
						struct stable_node, node);
			if (remove_stable_node(stable_node)) {
				err = -EBUSY;
				break;	/* proceed to next nid */
			}
			cond_resched();
		}
	}
	list_for_each_entry_safe(stable_node, next, &migrate_nodes, list) {
		if (remove_stable_node(stable_node))
			err = -EBUSY;
		cond_resched();
	}
	return err;
}

static int unmerge_and_remove_all_rmap_items(void)
{
	struct mm_slot *mm_slot;
	struct mm_struct *mm;
	struct vm_area_struct *vma;
	int err = 0;

	spin_lock(&ksm_mmlist_lock);
	ksm_scan.mm_slot = list_entry(ksm_mm_head.mm_list.next,
						struct mm_slot, mm_list);
	spin_unlock(&ksm_mmlist_lock);

	for (mm_slot = ksm_scan.mm_slot;
			mm_slot != &ksm_mm_head; mm_slot = ksm_scan.mm_slot) {
		mm = mm_slot->mm;
		down_read(&mm->mmap_sem);
		for (vma = mm->mmap; vma; vma = vma->vm_next) {
			if (ksm_test_exit(mm))
				break;
			if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
				continue;
			err = unmerge_ksm_pages(vma,
						vma->vm_start, vma->vm_end);
			if (err)
				goto error;
		}

		remove_trailing_rmap_items(mm_slot, &mm_slot->rmap_list);
		up_read(&mm->mmap_sem);

		spin_lock(&ksm_mmlist_lock);
		ksm_scan.mm_slot = list_entry(mm_slot->mm_list.next,
						struct mm_slot, mm_list);
		if (ksm_test_exit(mm)) {
			hash_del(&mm_slot->link);
			list_del(&mm_slot->mm_list);
			spin_unlock(&ksm_mmlist_lock);

			free_mm_slot(mm_slot);
			clear_bit(MMF_VM_MERGEABLE, &mm->flags);
			mmdrop(mm);
		} else
			spin_unlock(&ksm_mmlist_lock);
	}

	/* Clean up stable nodes, but don't worry if some are still busy */
	remove_all_stable_nodes();
	ksm_scan.seqnr = 0;
	return 0;

error:
	up_read(&mm->mmap_sem);
	spin_lock(&ksm_mmlist_lock);
	ksm_scan.mm_slot = &ksm_mm_head;
	spin_unlock(&ksm_mmlist_lock);
	return err;
}
#endif /* CONFIG_SYSFS */

static u32 calc_checksum(struct page *page)
{
	u32 checksum;
	void *addr = kmap_atomic(page);
	checksum = jhash2(addr, PAGE_SIZE / 4, 17);
	kunmap_atomic(addr);
	return checksum;
}

static int memcmp_pages(struct page *page1, struct page *page2)
{
	char *addr1, *addr2;
	int ret;

	addr1 = kmap_atomic(page1);
	addr2 = kmap_atomic(page2);
	ret = memcmp(addr1, addr2, PAGE_SIZE);
	kunmap_atomic(addr2);
	kunmap_atomic(addr1);
	return ret;
}

static inline int pages_identical(struct page *page1, struct page *page2)
{
	return !memcmp_pages(page1, page2);
}

static int write_protect_page(struct vm_area_struct *vma, struct page *page,
			      pte_t *orig_pte)
{
	struct mm_struct *mm = vma->vm_mm;
	unsigned long addr;
	pte_t *ptep;
	spinlock_t *ptl;
	int swapped;
	int err = -EFAULT;
	unsigned long mmun_start;	/* For mmu_notifiers */
	unsigned long mmun_end;		/* For mmu_notifiers */

	addr = page_address_in_vma(page, vma);
	if (addr == -EFAULT)
		goto out;

	BUG_ON(PageTransCompound(page));

	mmun_start = addr;
	mmun_end   = addr + PAGE_SIZE;
	mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);

	ptep = page_check_address(page, mm, addr, &ptl, 0);
	if (!ptep)
		goto out_mn;

	if (pte_write(*ptep) || pte_dirty(*ptep)) {
		pte_t entry;

		swapped = PageSwapCache(page);
		flush_cache_page(vma, addr, page_to_pfn(page));
		/*
		 * Ok this is tricky, when get_user_pages_fast() run it doesn't
		 * take any lock, therefore the check that we are going to make
		 * with the pagecount against the mapcount is racey and
		 * O_DIRECT can happen right after the check.
		 * So we clear the pte and flush the tlb before the check
		 * this assure us that no O_DIRECT can happen after the check
		 * or in the middle of the check.
		 */
		entry = ptep_clear_flush_notify(vma, addr, ptep);
		/*
		 * Check that no O_DIRECT or similar I/O is in progress on the
		 * page
		 */
		if (page_mapcount(page) + 1 + swapped != page_count(page)) {
			set_pte_at(mm, addr, ptep, entry);
			goto out_unlock;
		}
		if (pte_dirty(entry))
			set_page_dirty(page);
		entry = pte_mkclean(pte_wrprotect(entry));
		set_pte_at_notify(mm, addr, ptep, entry);
	}
	*orig_pte = *ptep;
	err = 0;

out_unlock:
	pte_unmap_unlock(ptep, ptl);
out_mn:
	mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
out:
	return err;
}

/**
 * replace_page - replace page in vma by new ksm page
 * @vma:      vma that holds the pte pointing to page
 * @page:     the page we are replacing by kpage
 * @kpage:    the ksm page we replace page by
 * @orig_pte: the original value of the pte
 *
 * Returns 0 on success, -EFAULT on failure.
 */
static int replace_page(struct vm_area_struct *vma, struct page *page,
			struct page *kpage, pte_t orig_pte)
{
	struct mm_struct *mm = vma->vm_mm;
	pmd_t *pmd;
	pte_t *ptep;
	spinlock_t *ptl;
	unsigned long addr;
	int err = -EFAULT;
	unsigned long mmun_start;	/* For mmu_notifiers */
	unsigned long mmun_end;		/* For mmu_notifiers */

	addr = page_address_in_vma(page, vma);
	if (addr == -EFAULT)
		goto out;

	pmd = mm_find_pmd(mm, addr);
	if (!pmd)
		goto out;

	mmun_start = addr;
	mmun_end   = addr + PAGE_SIZE;
	mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);

	ptep = pte_offset_map_lock(mm, pmd, addr, &ptl);
	if (!pte_same(*ptep, orig_pte)) {
		pte_unmap_unlock(ptep, ptl);
		goto out_mn;
	}

	get_page(kpage);
	page_add_anon_rmap(kpage, vma, addr, false);

	flush_cache_page(vma, addr, pte_pfn(*ptep));
	ptep_clear_flush_notify(vma, addr, ptep);
	set_pte_at_notify(mm, addr, ptep, mk_pte(kpage, vma->vm_page_prot));

	page_remove_rmap(page, false);
	if (!page_mapped(page))
		try_to_free_swap(page);
	put_page(page);

	pte_unmap_unlock(ptep, ptl);
	err = 0;
out_mn:
	mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
out:
	return err;
}

/*
 * try_to_merge_one_page - take two pages and merge them into one
 * @vma: the vma that holds the pte pointing to page
 * @page: the PageAnon page that we want to replace with kpage
 * @kpage: the PageKsm page that we want to map instead of page,
 *         or NULL the first time when we want to use page as kpage.
 *
 * This function returns 0 if the pages were merged, -EFAULT otherwise.
 */
static int try_to_merge_one_page(struct vm_area_struct *vma,
				 struct page *page, struct page *kpage)
{
	pte_t orig_pte = __pte(0);
	int err = -EFAULT;

	if (page == kpage)			/* ksm page forked */
		return 0;

	if (!PageAnon(page))
		goto out;

	/*
	 * We need the page lock to read a stable PageSwapCache in
	 * write_protect_page().  We use trylock_page() instead of
	 * lock_page() because we don't want to wait here - we
	 * prefer to continue scanning and merging different pages,
	 * then come back to this page when it is unlocked.
	 */
	if (!trylock_page(page))
		goto out;

	if (PageTransCompound(page)) {
		err = split_huge_page(page);
		if (err)
			goto out_unlock;
	}

	/*
	 * If this anonymous page is mapped only here, its pte may need
	 * to be write-protected.  If it's mapped elsewhere, all of its
	 * ptes are necessarily already write-protected.  But in either
	 * case, we need to lock and check page_count is not raised.
	 */
	if (write_protect_page(vma, page, &orig_pte) == 0) {
		if (!kpage) {
			/*
			 * While we hold page lock, upgrade page from
			 * PageAnon+anon_vma to PageKsm+NULL stable_node:
			 * stable_tree_insert() will update stable_node.
			 */
			set_page_stable_node(page, NULL);
			mark_page_accessed(page);
			/*
			 * Page reclaim just frees a clean page with no dirty
			 * ptes: make sure that the ksm page would be swapped.
			 */
			if (!PageDirty(page))
				SetPageDirty(page);
			err = 0;
		} else if (pages_identical(page, kpage))
			err = replace_page(vma, page, kpage, orig_pte);
	}

	if ((vma->vm_flags & VM_LOCKED) && kpage && !err) {
		munlock_vma_page(page);
		if (!PageMlocked(kpage)) {
			unlock_page(page);
			lock_page(kpage);
			mlock_vma_page(kpage);
			page = kpage;		/* for final unlock */
		}
	}

out_unlock:
	unlock_page(page);
out:
	return err;
}

/*
 * try_to_merge_with_ksm_page - like try_to_merge_two_pages,
 * but no new kernel page is allocated: kpage must already be a ksm page.
 *
 * This function returns 0 if the pages were merged, -EFAULT otherwise.
 */
static int try_to_merge_with_ksm_page(struct rmap_item *rmap_item,
				      struct page *page, struct page *kpage)
{
	struct mm_struct *mm = rmap_item->mm;
	struct vm_area_struct *vma;
	int err = -EFAULT;

	down_read(&mm->mmap_sem);
	vma = find_mergeable_vma(mm, rmap_item->address);
	if (!vma)
		goto out;

	err = try_to_merge_one_page(vma, page, kpage);
	if (err)
		goto out;

	/* Unstable nid is in union with stable anon_vma: remove first */
	remove_rmap_item_from_tree(rmap_item);

	/* Must get reference to anon_vma while still holding mmap_sem */
	rmap_item->anon_vma = vma->anon_vma;
	get_anon_vma(vma->anon_vma);
out:
	up_read(&mm->mmap_sem);
	return err;
}

/*
 * try_to_merge_two_pages - take two identical pages and prepare them
 * to be merged into one page.
 *
 * This function returns the kpage if we successfully merged two identical
 * pages into one ksm page, NULL otherwise.
 *
 * Note that this function upgrades page to ksm page: if one of the pages
 * is already a ksm page, try_to_merge_with_ksm_page should be used.
 */
static struct page *try_to_merge_two_pages(struct rmap_item *rmap_item,
					   struct page *page,
					   struct rmap_item *tree_rmap_item,
					   struct page *tree_page)
{
	int err;

	err = try_to_merge_with_ksm_page(rmap_item, page, NULL);
	if (!err) {
		err = try_to_merge_with_ksm_page(tree_rmap_item,
							tree_page, page);
		/*
		 * If that fails, we have a ksm page with only one pte
		 * pointing to it: so break it.
		 */
		if (err)
			break_cow(rmap_item);
	}
	return err ? NULL : page;
}

/*
 * stable_tree_search - search for page inside the stable tree
 *
 * This function checks if there is a page inside the stable tree
 * with identical content to the page that we are scanning right now.
 *
 * This function returns the stable tree node of identical content if found,
 * NULL otherwise.
 */
static struct page *stable_tree_search(struct page *page)
{
	int nid;
	struct rb_root *root;
	struct rb_node **new;
	struct rb_node *parent;
	struct stable_node *stable_node;
	struct stable_node *page_node;

	page_node = page_stable_node(page);
	if (page_node && page_node->head != &migrate_nodes) {
		/* ksm page forked */
		get_page(page);
		return page;
	}

	nid = get_kpfn_nid(page_to_pfn(page));
	root = root_stable_tree + nid;
again:
	new = &root->rb_node;
	parent = NULL;

	while (*new) {
		struct page *tree_page;
		int ret;

		cond_resched();
		stable_node = rb_entry(*new, struct stable_node, node);
		tree_page = get_ksm_page(stable_node, false);
		if (!tree_page) {
			/*
			 * If we walked over a stale stable_node,
			 * get_ksm_page() will call rb_erase() and it
			 * may rebalance the tree from under us. So
			 * restart the search from scratch. Returning
			 * NULL would be safe too, but we'd generate
			 * false negative insertions just because some
			 * stable_node was stale.
			 */
			goto again;
		}

		ret = memcmp_pages(page, tree_page);
		put_page(tree_page);

		parent = *new;
		if (ret < 0)
			new = &parent->rb_left;
		else if (ret > 0)
			new = &parent->rb_right;
		else {
			/*
			 * Lock and unlock the stable_node's page (which
			 * might already have been migrated) so that page
			 * migration is sure to notice its raised count.
			 * It would be more elegant to return stable_node
			 * than kpage, but that involves more changes.
			 */
			tree_page = get_ksm_page(stable_node, true);
			if (tree_page) {
				unlock_page(tree_page);
				if (get_kpfn_nid(stable_node->kpfn) !=
						NUMA(stable_node->nid)) {
					put_page(tree_page);
					goto replace;
				}
				return tree_page;
			}
			/*
			 * There is now a place for page_node, but the tree may
			 * have been rebalanced, so re-evaluate parent and new.
			 */
			if (page_node)
				goto again;
			return NULL;
		}
	}

	if (!page_node)
		return NULL;

	list_del(&page_node->list);
	DO_NUMA(page_node->nid = nid);
	rb_link_node(&page_node->node, parent, new);
	rb_insert_color(&page_node->node, root);
	get_page(page);
	return page;

replace:
	if (page_node) {
		list_del(&page_node->list);
		DO_NUMA(page_node->nid = nid);
		rb_replace_node(&stable_node->node, &page_node->node, root);
		get_page(page);
	} else {
		rb_erase(&stable_node->node, root);
		page = NULL;
	}
	stable_node->head = &migrate_nodes;
	list_add(&stable_node->list, stable_node->head);
	return page;
}

/*
 * stable_tree_insert - insert stable tree node pointing to new ksm page
 * into the stable tree.
 *
 * This function returns the stable tree node just allocated on success,
 * NULL otherwise.
 */
static struct stable_node *stable_tree_insert(struct page *kpage)
{
	int nid;
	unsigned long kpfn;
	struct rb_root *root;
	struct rb_node **new;
	struct rb_node *parent;
	struct stable_node *stable_node;

	kpfn = page_to_pfn(kpage);
	nid = get_kpfn_nid(kpfn);
	root = root_stable_tree + nid;
again:
	parent = NULL;
	new = &root->rb_node;

	while (*new) {
		struct page *tree_page;
		int ret;

		cond_resched();
		stable_node = rb_entry(*new, struct stable_node, node);
		tree_page = get_ksm_page(stable_node, false);
		if (!tree_page) {
			/*
			 * If we walked over a stale stable_node,
			 * get_ksm_page() will call rb_erase() and it
			 * may rebalance the tree from under us. So
			 * restart the search from scratch. Returning
			 * NULL would be safe too, but we'd generate
			 * false negative insertions just because some
			 * stable_node was stale.
			 */
			goto again;
		}

		ret = memcmp_pages(kpage, tree_page);
		put_page(tree_page);

		parent = *new;
		if (ret < 0)
			new = &parent->rb_left;
		else if (ret > 0)
			new = &parent->rb_right;
		else {
			/*
			 * It is not a bug that stable_tree_search() didn't
			 * find this node: because at that time our page was
			 * not yet write-protected, so may have changed since.
			 */
			return NULL;
		}
	}

	stable_node = alloc_stable_node();
	if (!stable_node)
		return NULL;

	INIT_HLIST_HEAD(&stable_node->hlist);
	stable_node->kpfn = kpfn;
	set_page_stable_node(kpage, stable_node);
	DO_NUMA(stable_node->nid = nid);
	rb_link_node(&stable_node->node, parent, new);
	rb_insert_color(&stable_node->node, root);

	return stable_node;
}

/*
 * unstable_tree_search_insert - search for identical page,
 * else insert rmap_item into the unstable tree.
 *
 * This function searches for a page in the unstable tree identical to the
 * page currently being scanned; and if no identical page is found in the
 * tree, we insert rmap_item as a new object into the unstable tree.
 *
 * This function returns pointer to rmap_item found to be identical
 * to the currently scanned page, NULL otherwise.
 *
 * This function does both searching and inserting, because they share
 * the same walking algorithm in an rbtree.
 */
static
struct rmap_item *unstable_tree_search_insert(struct rmap_item *rmap_item,
					      struct page *page,
					      struct page **tree_pagep)
{
	struct rb_node **new;
	struct rb_root *root;
	struct rb_node *parent = NULL;
	int nid;

	nid = get_kpfn_nid(page_to_pfn(page));
	root = root_unstable_tree + nid;
	new = &root->rb_node;

	while (*new) {
		struct rmap_item *tree_rmap_item;
		struct page *tree_page;
		int ret;

		cond_resched();
		tree_rmap_item = rb_entry(*new, struct rmap_item, node);
		tree_page = get_mergeable_page(tree_rmap_item);
		if (!tree_page)
			return NULL;

		/*
		 * Don't substitute a ksm page for a forked page.
		 */
		if (page == tree_page) {
			put_page(tree_page);
			return NULL;
		}

		ret = memcmp_pages(page, tree_page);

		parent = *new;
		if (ret < 0) {
			put_page(tree_page);
			new = &parent->rb_left;
		} else if (ret > 0) {
			put_page(tree_page);
			new = &parent->rb_right;
		} else if (!ksm_merge_across_nodes &&
			   page_to_nid(tree_page) != nid) {
			/*
			 * If tree_page has been migrated to another NUMA node,
			 * it will be flushed out and put in the right unstable
			 * tree next time: only merge with it when across_nodes.
			 */
			put_page(tree_page);
			return NULL;
		} else {
			*tree_pagep = tree_page;
			return tree_rmap_item;
		}
	}

	rmap_item->address |= UNSTABLE_FLAG;
	rmap_item->address |= (ksm_scan.seqnr & SEQNR_MASK);
	DO_NUMA(rmap_item->nid = nid);
	rb_link_node(&rmap_item->node, parent, new);
	rb_insert_color(&rmap_item->node, root);

	ksm_pages_unshared++;
	return NULL;
}

/*
 * stable_tree_append - add another rmap_item to the linked list of
 * rmap_items hanging off a given node of the stable tree, all sharing
 * the same ksm page.
 */
static void stable_tree_append(struct rmap_item *rmap_item,
			       struct stable_node *stable_node)
{
	rmap_item->head = stable_node;
	rmap_item->address |= STABLE_FLAG;
	hlist_add_head(&rmap_item->hlist, &stable_node->hlist);

	if (rmap_item->hlist.next)
		ksm_pages_sharing++;
	else
		ksm_pages_shared++;
}

/*
 * cmp_and_merge_page - first see if page can be merged into the stable tree;
 * if not, compare checksum to previous and if it's the same, see if page can
 * be inserted into the unstable tree, or merged with a page already there and
 * both transferred to the stable tree.
 *
 * @page: the page that we are searching identical page to.
 * @rmap_item: the reverse mapping into the virtual address of this page
 */
static void cmp_and_merge_page(struct page *page, struct rmap_item *rmap_item)
{
	struct rmap_item *tree_rmap_item;
	struct page *tree_page = NULL;
	struct stable_node *stable_node;
	struct page *kpage;
	unsigned int checksum;
	int err;

	stable_node = page_stable_node(page);
	if (stable_node) {
		if (stable_node->head != &migrate_nodes &&
		    get_kpfn_nid(stable_node->kpfn) != NUMA(stable_node->nid)) {
			rb_erase(&stable_node->node,
				 root_stable_tree + NUMA(stable_node->nid));
			stable_node->head = &migrate_nodes;
			list_add(&stable_node->list, stable_node->head);
		}
		if (stable_node->head != &migrate_nodes &&
		    rmap_item->head == stable_node)
			return;
	}

	/* We first start with searching the page inside the stable tree */
	kpage = stable_tree_search(page);
	if (kpage == page && rmap_item->head == stable_node) {
		put_page(kpage);
		return;
	}

	remove_rmap_item_from_tree(rmap_item);

	if (kpage) {
		err = try_to_merge_with_ksm_page(rmap_item, page, kpage);
		if (!err) {
			/*
			 * The page was successfully merged:
			 * add its rmap_item to the stable tree.
			 */
			lock_page(kpage);
			stable_tree_append(rmap_item, page_stable_node(kpage));
			unlock_page(kpage);
		}
		put_page(kpage);
		return;
	}

	/*
	 * If the hash value of the page has changed from the last time
	 * we calculated it, this page is changing frequently: therefore we
	 * don't want to insert it in the unstable tree, and we don't want
	 * to waste our time searching for something identical to it there.
	 */
	checksum = calc_checksum(page);
	if (rmap_item->oldchecksum != checksum) {
		rmap_item->oldchecksum = checksum;
		return;
	}

	tree_rmap_item =
		unstable_tree_search_insert(rmap_item, page, &tree_page);
	if (tree_rmap_item) {
		kpage = try_to_merge_two_pages(rmap_item, page,
						tree_rmap_item, tree_page);
		put_page(tree_page);
		if (kpage) {
			/*
			 * The pages were successfully merged: insert new
			 * node in the stable tree and add both rmap_items.
			 */
			lock_page(kpage);
			stable_node = stable_tree_insert(kpage);
			if (stable_node) {
				stable_tree_append(tree_rmap_item, stable_node);
				stable_tree_append(rmap_item, stable_node);
			}
			unlock_page(kpage);

			/*
			 * If we fail to insert the page into the stable tree,
			 * we will have 2 virtual addresses that are pointing
			 * to a ksm page left outside the stable tree,
			 * in which case we need to break_cow on both.
			 */
			if (!stable_node) {
				break_cow(tree_rmap_item);
				break_cow(rmap_item);
			}
		}
	}
}

static struct rmap_item *get_next_rmap_item(struct mm_slot *mm_slot,
					    struct rmap_item **rmap_list,
					    unsigned long addr)
{
	struct rmap_item *rmap_item;

	while (*rmap_list) {
		rmap_item = *rmap_list;
		if ((rmap_item->address & PAGE_MASK) == addr)
			return rmap_item;
		if (rmap_item->address > addr)
			break;
		*rmap_list = rmap_item->rmap_list;
		remove_rmap_item_from_tree(rmap_item);
		free_rmap_item(rmap_item);
	}

	rmap_item = alloc_rmap_item();
	if (rmap_item) {
		/* It has already been zeroed */
		rmap_item->mm = mm_slot->mm;
		rmap_item->address = addr;
		rmap_item->rmap_list = *rmap_list;
		*rmap_list = rmap_item;
	}
	return rmap_item;
}

static struct rmap_item *scan_get_next_rmap_item(struct page **page)
{
	struct mm_struct *mm;
	struct mm_slot *slot;
	struct vm_area_struct *vma;
	struct rmap_item *rmap_item;
	int nid;

	if (list_empty(&ksm_mm_head.mm_list))
		return NULL;

	slot = ksm_scan.mm_slot;
	if (slot == &ksm_mm_head) {
		/*
		 * A number of pages can hang around indefinitely on per-cpu
		 * pagevecs, raised page count preventing write_protect_page
		 * from merging them.  Though it doesn't really matter much,
		 * it is puzzling to see some stuck in pages_volatile until
		 * other activity jostles them out, and they also prevented
		 * LTP's KSM test from succeeding deterministically; so drain
		 * them here (here rather than on entry to ksm_do_scan(),
		 * so we don't IPI too often when pages_to_scan is set low).
		 */
		lru_add_drain_all();

		/*
		 * Whereas stale stable_nodes on the stable_tree itself
		 * get pruned in the regular course of stable_tree_search(),
		 * those moved out to the migrate_nodes list can accumulate:
		 * so prune them once before each full scan.
		 */
		if (!ksm_merge_across_nodes) {
			struct stable_node *stable_node, *next;
			struct page *page;

			list_for_each_entry_safe(stable_node, next,
						 &migrate_nodes, list) {
				page = get_ksm_page(stable_node, false);
				if (page)
					put_page(page);
				cond_resched();
			}
		}

		for (nid = 0; nid < ksm_nr_node_ids; nid++)
			root_unstable_tree[nid] = RB_ROOT;

		spin_lock(&ksm_mmlist_lock);
		slot = list_entry(slot->mm_list.next, struct mm_slot, mm_list);
		ksm_scan.mm_slot = slot;
		spin_unlock(&ksm_mmlist_lock);
		/*
		 * Although we tested list_empty() above, a racing __ksm_exit
		 * of the last mm on the list may have removed it since then.
		 */
		if (slot == &ksm_mm_head)
			return NULL;
next_mm:
		ksm_scan.address = 0;
		ksm_scan.rmap_list = &slot->rmap_list;
	}

	mm = slot->mm;
	down_read(&mm->mmap_sem);
	if (ksm_test_exit(mm))
		vma = NULL;
	else
		vma = find_vma(mm, ksm_scan.address);

	for (; vma; vma = vma->vm_next) {
		if (!(vma->vm_flags & VM_MERGEABLE))
			continue;
		if (ksm_scan.address < vma->vm_start)
			ksm_scan.address = vma->vm_start;
		if (!vma->anon_vma)
			ksm_scan.address = vma->vm_end;

		while (ksm_scan.address < vma->vm_end) {
			if (ksm_test_exit(mm))
				break;
			*page = follow_page(vma, ksm_scan.address, FOLL_GET);
			if (IS_ERR_OR_NULL(*page)) {
				ksm_scan.address += PAGE_SIZE;
				cond_resched();
				continue;
			}
			if (PageAnon(*page)) {
				flush_anon_page(vma, *page, ksm_scan.address);
				flush_dcache_page(*page);
				rmap_item = get_next_rmap_item(slot,
					ksm_scan.rmap_list, ksm_scan.address);
				if (rmap_item) {
					ksm_scan.rmap_list =
							&rmap_item->rmap_list;
					ksm_scan.address += PAGE_SIZE;
				} else
					put_page(*page);
				up_read(&mm->mmap_sem);
				return rmap_item;
			}
			put_page(*page);
			ksm_scan.address += PAGE_SIZE;
			cond_resched();
		}
	}

	if (ksm_test_exit(mm)) {
		ksm_scan.address = 0;
		ksm_scan.rmap_list = &slot->rmap_list;
	}
	/*
	 * Nuke all the rmap_items that are above this current rmap:
	 * because there were no VM_MERGEABLE vmas with such addresses.
	 */
	remove_trailing_rmap_items(slot, ksm_scan.rmap_list);

	spin_lock(&ksm_mmlist_lock);
	ksm_scan.mm_slot = list_entry(slot->mm_list.next,
						struct mm_slot, mm_list);
	if (ksm_scan.address == 0) {
		/*
		 * We've completed a full scan of all vmas, holding mmap_sem
		 * throughout, and found no VM_MERGEABLE: so do the same as
		 * __ksm_exit does to remove this mm from all our lists now.
		 * This applies either when cleaning up after __ksm_exit
		 * (but beware: we can reach here even before __ksm_exit),
		 * or when all VM_MERGEABLE areas have been unmapped (and
		 * mmap_sem then protects against race with MADV_MERGEABLE).
		 */
		hash_del(&slot->link);
		list_del(&slot->mm_list);
		spin_unlock(&ksm_mmlist_lock);

		free_mm_slot(slot);
		clear_bit(MMF_VM_MERGEABLE, &mm->flags);
		up_read(&mm->mmap_sem);
		mmdrop(mm);
	} else {
		up_read(&mm->mmap_sem);
		/*
		 * up_read(&mm->mmap_sem) first because after
		 * spin_unlock(&ksm_mmlist_lock) run, the "mm" may
		 * already have been freed under us by __ksm_exit()
		 * because the "mm_slot" is still hashed and
		 * ksm_scan.mm_slot doesn't point to it anymore.
		 */
		spin_unlock(&ksm_mmlist_lock);
	}

	/* Repeat until we've completed scanning the whole list */
	slot = ksm_scan.mm_slot;
	if (slot != &ksm_mm_head)
		goto next_mm;

	ksm_scan.seqnr++;
	return NULL;
}

/**
 * ksm_do_scan  - the ksm scanner main worker function.
 * @scan_npages - number of pages we want to scan before we return.
 */
static void ksm_do_scan(unsigned int scan_npages)
{
	struct rmap_item *rmap_item;
	struct page *uninitialized_var(page);

	while (scan_npages-- && likely(!freezing(current))) {
		cond_resched();
		rmap_item = scan_get_next_rmap_item(&page);
		if (!rmap_item)
			return;
		cmp_and_merge_page(page, rmap_item);
		put_page(page);
	}
}

static int ksmd_should_run(void)
{
	return (ksm_run & KSM_RUN_MERGE) && !list_empty(&ksm_mm_head.mm_list);
}

static int ksm_scan_thread(void *nothing)
{
	set_freezable();
	set_user_nice(current, 5);

	while (!kthread_should_stop()) {
		mutex_lock(&ksm_thread_mutex);
		wait_while_offlining();
		if (ksmd_should_run())
			ksm_do_scan(ksm_thread_pages_to_scan);
		mutex_unlock(&ksm_thread_mutex);

		try_to_freeze();

		if (ksmd_should_run()) {
			schedule_timeout_interruptible(
				msecs_to_jiffies(ksm_thread_sleep_millisecs));
		} else {
			wait_event_freezable(ksm_thread_wait,
				ksmd_should_run() || kthread_should_stop());
		}
	}
	return 0;
}

int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
		unsigned long end, int advice, unsigned long *vm_flags)
{
	struct mm_struct *mm = vma->vm_mm;
	int err;

	switch (advice) {
	case MADV_MERGEABLE:
		/*
		 * Be somewhat over-protective for now!
		 */
		if (*vm_flags & (VM_MERGEABLE | VM_SHARED  | VM_MAYSHARE   |
				 VM_PFNMAP    | VM_IO      | VM_DONTEXPAND |
				 VM_HUGETLB | VM_MIXEDMAP))
			return 0;		/* just ignore the advice */

#ifdef VM_SAO
		if (*vm_flags & VM_SAO)
			return 0;
#endif

		if (!test_bit(MMF_VM_MERGEABLE, &mm->flags)) {
			err = __ksm_enter(mm);
			if (err)
				return err;
		}

		*vm_flags |= VM_MERGEABLE;
		break;

	case MADV_UNMERGEABLE:
		if (!(*vm_flags & VM_MERGEABLE))
			return 0;		/* just ignore the advice */

		if (vma->anon_vma) {
			err = unmerge_ksm_pages(vma, start, end);
			if (err)
				return err;
		}

		*vm_flags &= ~VM_MERGEABLE;
		break;
	}

	return 0;
}

int __ksm_enter(struct mm_struct *mm)
{
	struct mm_slot *mm_slot;
	int needs_wakeup;

	mm_slot = alloc_mm_slot();
	if (!mm_slot)
		return -ENOMEM;

	/* Check ksm_run too?  Would need tighter locking */
	needs_wakeup = list_empty(&ksm_mm_head.mm_list);

	spin_lock(&ksm_mmlist_lock);
	insert_to_mm_slots_hash(mm, mm_slot);
	/*
	 * When KSM_RUN_MERGE (or KSM_RUN_STOP),
	 * insert just behind the scanning cursor, to let the area settle
	 * down a little; when fork is followed by immediate exec, we don't
	 * want ksmd to waste time setting up and tearing down an rmap_list.
	 *
	 * But when KSM_RUN_UNMERGE, it's important to insert ahead of its
	 * scanning cursor, otherwise KSM pages in newly forked mms will be
	 * missed: then we might as well insert at the end of the list.
	 */
	if (ksm_run & KSM_RUN_UNMERGE)
		list_add_tail(&mm_slot->mm_list, &ksm_mm_head.mm_list);
	else
		list_add_tail(&mm_slot->mm_list, &ksm_scan.mm_slot->mm_list);
	spin_unlock(&ksm_mmlist_lock);

	set_bit(MMF_VM_MERGEABLE, &mm->flags);
	atomic_inc(&mm->mm_count);

	if (needs_wakeup)
		wake_up_interruptible(&ksm_thread_wait);

	return 0;
}

void __ksm_exit(struct mm_struct *mm)
{
	struct mm_slot *mm_slot;
	int easy_to_free = 0;

	/*
	 * This process is exiting: if it's straightforward (as is the
	 * case when ksmd was never running), free mm_slot immediately.
	 * But if it's at the cursor or has rmap_items linked to it, use
	 * mmap_sem to synchronize with any break_cows before pagetables
	 * are freed, and leave the mm_slot on the list for ksmd to free.
	 * Beware: ksm may already have noticed it exiting and freed the slot.
	 */

	spin_lock(&ksm_mmlist_lock);
	mm_slot = get_mm_slot(mm);
	if (mm_slot && ksm_scan.mm_slot != mm_slot) {
		if (!mm_slot->rmap_list) {
			hash_del(&mm_slot->link);
			list_del(&mm_slot->mm_list);
			easy_to_free = 1;
		} else {
			list_move(&mm_slot->mm_list,
				  &ksm_scan.mm_slot->mm_list);
		}
	}
	spin_unlock(&ksm_mmlist_lock);

	if (easy_to_free) {
		free_mm_slot(mm_slot);
		clear_bit(MMF_VM_MERGEABLE, &mm->flags);
		mmdrop(mm);
	} else if (mm_slot) {
		down_write(&mm->mmap_sem);
		up_write(&mm->mmap_sem);
	}
}

struct page *ksm_might_need_to_copy(struct page *page,
			struct vm_area_struct *vma, unsigned long address)
{
	struct anon_vma *anon_vma = page_anon_vma(page);
	struct page *new_page;

	if (PageKsm(page)) {
		if (page_stable_node(page) &&
		    !(ksm_run & KSM_RUN_UNMERGE))
			return page;	/* no need to copy it */
	} else if (!anon_vma) {
		return page;		/* no need to copy it */
	} else if (anon_vma->root == vma->anon_vma->root &&
		 page->index == linear_page_index(vma, address)) {
		return page;		/* still no need to copy it */
	}
	if (!PageUptodate(page))
		return page;		/* let do_swap_page report the error */

	new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
	if (new_page) {
		copy_user_highpage(new_page, page, address, vma);

		SetPageDirty(new_page);
		__SetPageUptodate(new_page);
		__SetPageLocked(new_page);
	}

	return new_page;
}

int rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc)
{
	struct stable_node *stable_node;
	struct rmap_item *rmap_item;
	int ret = SWAP_AGAIN;
	int search_new_forks = 0;

	VM_BUG_ON_PAGE(!PageKsm(page), page);

	/*
	 * Rely on the page lock to protect against concurrent modifications
	 * to that page's node of the stable tree.
	 */
	VM_BUG_ON_PAGE(!PageLocked(page), page);

	stable_node = page_stable_node(page);
	if (!stable_node)
		return ret;
again:
	hlist_for_each_entry(rmap_item, &stable_node->hlist, hlist) {
		struct anon_vma *anon_vma = rmap_item->anon_vma;
		struct anon_vma_chain *vmac;
		struct vm_area_struct *vma;

		cond_resched();
		anon_vma_lock_read(anon_vma);
		anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
					       0, ULONG_MAX) {
			cond_resched();
			vma = vmac->vma;
			if (rmap_item->address < vma->vm_start ||
			    rmap_item->address >= vma->vm_end)
				continue;
			/*
			 * Initially we examine only the vma which covers this
			 * rmap_item; but later, if there is still work to do,
			 * we examine covering vmas in other mms: in case they
			 * were forked from the original since ksmd passed.
			 */
			if ((rmap_item->mm == vma->vm_mm) == search_new_forks)
				continue;

			if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg))
				continue;

			ret = rwc->rmap_one(page, vma,
					rmap_item->address, rwc->arg);
			if (ret != SWAP_AGAIN) {
				anon_vma_unlock_read(anon_vma);
				goto out;
			}
			if (rwc->done && rwc->done(page)) {
				anon_vma_unlock_read(anon_vma);
				goto out;
			}
		}
		anon_vma_unlock_read(anon_vma);
	}
	if (!search_new_forks++)
		goto again;
out:
	return ret;
}

#ifdef CONFIG_MIGRATION
void ksm_migrate_page(struct page *newpage, struct page *oldpage)
{
	struct stable_node *stable_node;

	VM_BUG_ON_PAGE(!PageLocked(oldpage), oldpage);
	VM_BUG_ON_PAGE(!PageLocked(newpage), newpage);
	VM_BUG_ON_PAGE(newpage->mapping != oldpage->mapping, newpage);

	stable_node = page_stable_node(newpage);
	if (stable_node) {
		VM_BUG_ON_PAGE(stable_node->kpfn != page_to_pfn(oldpage), oldpage);
		stable_node->kpfn = page_to_pfn(newpage);
		/*
		 * newpage->mapping was set in advance; now we need smp_wmb()
		 * to make sure that the new stable_node->kpfn is visible
		 * to get_ksm_page() before it can see that oldpage->mapping
		 * has gone stale (or that PageSwapCache has been cleared).
		 */
		smp_wmb();
		set_page_stable_node(oldpage, NULL);
	}
}
#endif /* CONFIG_MIGRATION */

#ifdef CONFIG_MEMORY_HOTREMOVE
static void wait_while_offlining(void)
{
	while (ksm_run & KSM_RUN_OFFLINE) {
		mutex_unlock(&ksm_thread_mutex);
		wait_on_bit(&ksm_run, ilog2(KSM_RUN_OFFLINE),
			    TASK_UNINTERRUPTIBLE);
		mutex_lock(&ksm_thread_mutex);
	}
}

static void ksm_check_stable_tree(unsigned long start_pfn,
				  unsigned long end_pfn)
{
	struct stable_node *stable_node, *next;
	struct rb_node *node;
	int nid;

	for (nid = 0; nid < ksm_nr_node_ids; nid++) {
		node = rb_first(root_stable_tree + nid);
		while (node) {
			stable_node = rb_entry(node, struct stable_node, node);
			if (stable_node->kpfn >= start_pfn &&
			    stable_node->kpfn < end_pfn) {
				/*
				 * Don't get_ksm_page, page has already gone:
				 * which is why we keep kpfn instead of page*
				 */
				remove_node_from_stable_tree(stable_node);
				node = rb_first(root_stable_tree + nid);
			} else
				node = rb_next(node);
			cond_resched();
		}
	}
	list_for_each_entry_safe(stable_node, next, &migrate_nodes, list) {
		if (stable_node->kpfn >= start_pfn &&
		    stable_node->kpfn < end_pfn)
			remove_node_from_stable_tree(stable_node);
		cond_resched();
	}
}

static int ksm_memory_callback(struct notifier_block *self,
			       unsigned long action, void *arg)
{
	struct memory_notify *mn = arg;

	switch (action) {
	case MEM_GOING_OFFLINE:
		/*
		 * Prevent ksm_do_scan(), unmerge_and_remove_all_rmap_items()
		 * and remove_all_stable_nodes() while memory is going offline:
		 * it is unsafe for them to touch the stable tree at this time.
		 * But unmerge_ksm_pages(), rmap lookups and other entry points
		 * which do not need the ksm_thread_mutex are all safe.
		 */
		mutex_lock(&ksm_thread_mutex);
		ksm_run |= KSM_RUN_OFFLINE;
		mutex_unlock(&ksm_thread_mutex);
		break;

	case MEM_OFFLINE:
		/*
		 * Most of the work is done by page migration; but there might
		 * be a few stable_nodes left over, still pointing to struct
		 * pages which have been offlined: prune those from the tree,
		 * otherwise get_ksm_page() might later try to access a
		 * non-existent struct page.
		 */
		ksm_check_stable_tree(mn->start_pfn,
				      mn->start_pfn + mn->nr_pages);
		/* fallthrough */

	case MEM_CANCEL_OFFLINE:
		mutex_lock(&ksm_thread_mutex);
		ksm_run &= ~KSM_RUN_OFFLINE;
		mutex_unlock(&ksm_thread_mutex);

		smp_mb();	/* wake_up_bit advises this */
		wake_up_bit(&ksm_run, ilog2(KSM_RUN_OFFLINE));
		break;
	}
	return NOTIFY_OK;
}
#else
static void wait_while_offlining(void)
{
}
#endif /* CONFIG_MEMORY_HOTREMOVE */

#ifdef CONFIG_SYSFS
/*
 * This all compiles without CONFIG_SYSFS, but is a waste of space.
 */

#define KSM_ATTR_RO(_name) \
	static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
#define KSM_ATTR(_name) \
	static struct kobj_attribute _name##_attr = \
		__ATTR(_name, 0644, _name##_show, _name##_store)

static ssize_t sleep_millisecs_show(struct kobject *kobj,
				    struct kobj_attribute *attr, char *buf)
{
	return sprintf(buf, "%u\n", ksm_thread_sleep_millisecs);
}

static ssize_t sleep_millisecs_store(struct kobject *kobj,
				     struct kobj_attribute *attr,
				     const char *buf, size_t count)
{
	unsigned long msecs;
	int err;

	err = kstrtoul(buf, 10, &msecs);
	if (err || msecs > UINT_MAX)
		return -EINVAL;

	ksm_thread_sleep_millisecs = msecs;

	return count;
}
KSM_ATTR(sleep_millisecs);

static ssize_t pages_to_scan_show(struct kobject *kobj,
				  struct kobj_attribute *attr, char *buf)
{
	return sprintf(buf, "%u\n", ksm_thread_pages_to_scan);
}

static ssize_t pages_to_scan_store(struct kobject *kobj,
				   struct kobj_attribute *attr,
				   const char *buf, size_t count)
{
	int err;
	unsigned long nr_pages;

	err = kstrtoul(buf, 10, &nr_pages);
	if (err || nr_pages > UINT_MAX)
		return -EINVAL;

	ksm_thread_pages_to_scan = nr_pages;

	return count;
}
KSM_ATTR(pages_to_scan);

static ssize_t run_show(struct kobject *kobj, struct kobj_attribute *attr,
			char *buf)
{
	return sprintf(buf, "%lu\n", ksm_run);
}

static ssize_t run_store(struct kobject *kobj, struct kobj_attribute *attr,
			 const char *buf, size_t count)
{
	int err;
	unsigned long flags;

	err = kstrtoul(buf, 10, &flags);
	if (err || flags > UINT_MAX)
		return -EINVAL;
	if (flags > KSM_RUN_UNMERGE)
		return -EINVAL;

	/*
	 * KSM_RUN_MERGE sets ksmd running, and 0 stops it running.
	 * KSM_RUN_UNMERGE stops it running and unmerges all rmap_items,
	 * breaking COW to free the pages_shared (but leaves mm_slots
	 * on the list for when ksmd may be set running again).
	 */

	mutex_lock(&ksm_thread_mutex);
	wait_while_offlining();
	if (ksm_run != flags) {
		ksm_run = flags;
		if (flags & KSM_RUN_UNMERGE) {
			set_current_oom_origin();
			err = unmerge_and_remove_all_rmap_items();
			clear_current_oom_origin();
			if (err) {
				ksm_run = KSM_RUN_STOP;
				count = err;
			}
		}
	}
	mutex_unlock(&ksm_thread_mutex);

	if (flags & KSM_RUN_MERGE)
		wake_up_interruptible(&ksm_thread_wait);

	return count;
}
KSM_ATTR(run);

#ifdef CONFIG_NUMA
static ssize_t merge_across_nodes_show(struct kobject *kobj,
				struct kobj_attribute *attr, char *buf)
{
	return sprintf(buf, "%u\n", ksm_merge_across_nodes);
}

static ssize_t merge_across_nodes_store(struct kobject *kobj,
				   struct kobj_attribute *attr,
				   const char *buf, size_t count)
{
	int err;
	unsigned long knob;

	err = kstrtoul(buf, 10, &knob);
	if (err)
		return err;
	if (knob > 1)
		return -EINVAL;

	mutex_lock(&ksm_thread_mutex);
	wait_while_offlining();
	if (ksm_merge_across_nodes != knob) {
		if (ksm_pages_shared || remove_all_stable_nodes())
			err = -EBUSY;
		else if (root_stable_tree == one_stable_tree) {
			struct rb_root *buf;
			/*
			 * This is the first time that we switch away from the
			 * default of merging across nodes: must now allocate
			 * a buffer to hold as many roots as may be needed.
			 * Allocate stable and unstable together:
			 * MAXSMP NODES_SHIFT 10 will use 16kB.
			 */
			buf = kcalloc(nr_node_ids + nr_node_ids, sizeof(*buf),
				      GFP_KERNEL);
			/* Let us assume that RB_ROOT is NULL is zero */
			if (!buf)
				err = -ENOMEM;
			else {
				root_stable_tree = buf;
				root_unstable_tree = buf + nr_node_ids;
				/* Stable tree is empty but not the unstable */
				root_unstable_tree[0] = one_unstable_tree[0];
			}
		}
		if (!err) {
			ksm_merge_across_nodes = knob;
			ksm_nr_node_ids = knob ? 1 : nr_node_ids;
		}
	}
	mutex_unlock(&ksm_thread_mutex);

	return err ? err : count;
}
KSM_ATTR(merge_across_nodes);
#endif

static ssize_t pages_shared_show(struct kobject *kobj,
				 struct kobj_attribute *attr, char *buf)
{
	return sprintf(buf, "%lu\n", ksm_pages_shared);
}
KSM_ATTR_RO(pages_shared);

static ssize_t pages_sharing_show(struct kobject *kobj,
				  struct kobj_attribute *attr, char *buf)
{
	return sprintf(buf, "%lu\n", ksm_pages_sharing);
}
KSM_ATTR_RO(pages_sharing);

static ssize_t pages_unshared_show(struct kobject *kobj,
				   struct kobj_attribute *attr, char *buf)
{
	return sprintf(buf, "%lu\n", ksm_pages_unshared);
}
KSM_ATTR_RO(pages_unshared);

static ssize_t pages_volatile_show(struct kobject *kobj,
				   struct kobj_attribute *attr, char *buf)
{
	long ksm_pages_volatile;

	ksm_pages_volatile = ksm_rmap_items - ksm_pages_shared
				- ksm_pages_sharing - ksm_pages_unshared;
	/*
	 * It was not worth any locking to calculate that statistic,
	 * but it might therefore sometimes be negative: conceal that.
	 */
	if (ksm_pages_volatile < 0)
		ksm_pages_volatile = 0;
	return sprintf(buf, "%ld\n", ksm_pages_volatile);
}
KSM_ATTR_RO(pages_volatile);

static ssize_t full_scans_show(struct kobject *kobj,
			       struct kobj_attribute *attr, char *buf)
{
	return sprintf(buf, "%lu\n", ksm_scan.seqnr);
}
KSM_ATTR_RO(full_scans);

static struct attribute *ksm_attrs[] = {
	&sleep_millisecs_attr.attr,
	&pages_to_scan_attr.attr,
	&run_attr.attr,
	&pages_shared_attr.attr,
	&pages_sharing_attr.attr,
	&pages_unshared_attr.attr,
	&pages_volatile_attr.attr,
	&full_scans_attr.attr,
#ifdef CONFIG_NUMA
	&merge_across_nodes_attr.attr,
#endif
	NULL,
};

static struct attribute_group ksm_attr_group = {
	.attrs = ksm_attrs,
	.name = "ksm",
};
#endif /* CONFIG_SYSFS */

static int __init ksm_init(void)
{
	struct task_struct *ksm_thread;
	int err;

	err = ksm_slab_init();
	if (err)
		goto out;

	ksm_thread = kthread_run(ksm_scan_thread, NULL, "ksmd");
	if (IS_ERR(ksm_thread)) {
		pr_err("ksm: creating kthread failed\n");
		err = PTR_ERR(ksm_thread);
		goto out_free;
	}

#ifdef CONFIG_SYSFS
	err = sysfs_create_group(mm_kobj, &ksm_attr_group);
	if (err) {
		pr_err("ksm: register sysfs failed\n");
		kthread_stop(ksm_thread);
		goto out_free;
	}
#else
	ksm_run = KSM_RUN_MERGE;	/* no way for user to start it */

#endif /* CONFIG_SYSFS */

#ifdef CONFIG_MEMORY_HOTREMOVE
	/* There is no significance to this priority 100 */
	hotplug_memory_notifier(ksm_memory_callback, 100);
#endif
	return 0;

out_free:
	ksm_slab_free();
out:
	return err;
}
subsys_initcall(ksm_init);


//
//  INSnapViewController.h
//  Snapmail
//
//  Created by Ben Gotow on 6/16/14.
//  Copyright (c) 2014 InboxApp, Inc. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface INSnapViewController : UIViewController <INModelProviderDelegate>

@property (nonatomic, weak) IBOutlet UIActivityIndicatorView * spinner;
@property (nonatomic, weak) IBOutlet UIImageView * imageView;
@property (nonatomic, weak) IBOutlet UILabel * errorLabel;
@property (nonatomic, weak) IBOutlet UILabel * timeLabel;

@property (nonatomic, strong) NSTimer * timer;
@property (nonatomic, strong) INMessageProvider * provider;

- (id)initWithThread:(INThread*)thread;

@end


set(csv_export_SOURCES
  gnc-plugin-csv-export.c
  assistant-csv-export.c
  csv-tree-export.c
  csv-transactions-export.c
)

# Add dependency on config.h
set_source_files_properties (${csv_export_SOURCES} PROPERTIES OBJECT_DEPENDS ${CONFIG_H})

set(csv_export_noinst_HEADERS
  gnc-plugin-csv-export.h
  assistant-csv-export.h
  csv-tree-export.h
  csv-transactions-export.h
)

add_library(gnc-csv-export ${csv_export_noinst_HEADERS} ${csv_export_SOURCES})

target_link_libraries(gnc-csv-export
    gnc-register-gnome
    gnc-register-core
    gnc-ledger-core
    gnc-engine
    gnc-gnome-utils
    gnc-gnome
    gnc-app-utils
    gnc-core-utils)

target_include_directories(gnc-csv-export
    PUBLIC
        ${CMAKE_CURRENT_SOURCE_DIR}
)

target_compile_definitions(gnc-csv-export PRIVATE -DG_LOG_DOMAIN=\"gnc.export.csv\")

if (APPLE)
  set_target_properties (gnc-csv-export PROPERTIES INSTALL_NAME_DIR "${CMAKE_INSTALL_FULL_LIBDIR}/gnucash")
endif()

install(TARGETS gnc-csv-export
  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}/gnucash
  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}/gnucash
  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
# No headers to install.

set_dist_list (csv_export_DIST CMakeLists.txt
        ${csv_export_SOURCES} ${csv_export_noinst_HEADERS})