/*
   *   fs/cifs/connect.c
   *

   *   Copyright (C) International Business Machines  Corp., 2002,2009

   *   Author(s): Steve French (sfrench@us.ibm.com)
   *
   *   This library is free software; you can redistribute it and/or modify
   *   it under the terms of the GNU Lesser General Public License as published
   *   by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
   *
   *   You should have received a copy of the GNU Lesser General Public License
   *   along with this library; if not, write to the Free Software

   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

   */
  #include <linux/fs.h>
  #include <linux/net.h>
  #include <linux/string.h>
  #include <linux/list.h>
  #include <linux/wait.h>

  #include <linux/slab.h>

  #include <linux/pagemap.h>
  #include <linux/ctype.h>
  #include <linux/utsname.h>
  #include <linux/mempool.h>

  #include <linux/delay.h>

  #include <linux/completion.h>

  #include <linux/kthread.h>

  #include <linux/pagevec.h>

  #include <linux/freezer.h>

  #include <linux/namei.h>

  #include <asm/uaccess.h>
  #include <asm/processor.h>

  #include <linux/inet.h>

  #include <linux/module.h>

  #include <net/ipv6.h>

  #include "cifspdu.h"
  #include "cifsglob.h"
  #include "cifsproto.h"
  #include "cifs_unicode.h"
  #include "cifs_debug.h"
  #include "cifs_fs_sb.h"
  #include "ntlmssp.h"
  #include "nterr.h"
  #include "rfc1002pdu.h"

  #include "fscache.h"

  
  #define CIFS_PORT 445
  #define RFC1001_PORT 139

  /* SMB echo "timeout" -- FIXME: tunable? */
  #define SMB_ECHO_INTERVAL (60 * HZ)

  extern mempool_t *cifs_req_poolp;

  /* FIXME: should these be tunable? */

  #define TLINK_ERROR_EXPIRE	(1 * HZ)

  #define TLINK_IDLE_EXPIRE	(600 * HZ)

  static int ip_connect(struct TCP_Server_Info *server);
  static int generic_ip_connect(struct TCP_Server_Info *server);

  static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);

  static void cifs_prune_tlinks(struct work_struct *work);

  static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
  					const char *devname);

  /*
   * cifs tcp session reconnection
   *
   * mark tcp session as reconnecting so temporarily locked
   * mark all smb sessions as reconnecting for tcp session
   * reconnect tcp session
   * wake up waiters on reconnection? - (not needed currently)
   */

  static int

  cifs_reconnect(struct TCP_Server_Info *server)
  {
  	int rc = 0;

  	struct list_head *tmp, *tmp2;

  	struct cifs_ses *ses;
  	struct cifs_tcon *tcon;

  	struct mid_q_entry *mid_entry;

  	struct list_head retry_list;

  	spin_lock(&GlobalMid_Lock);

  	if (server->tcpStatus == CifsExiting) {

  		/* the demux thread will exit normally

  		next time through the loop */
  		spin_unlock(&GlobalMid_Lock);
  		return rc;
  	} else
  		server->tcpStatus = CifsNeedReconnect;
  	spin_unlock(&GlobalMid_Lock);
  	server->maxBuf = 0;

  	cFYI(1, "Reconnecting tcp session");

  
  	/* before reconnecting the tcp session, mark the smb session (uid)
  		and the tid bad so they are not used until reconnected */

  	cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);

  	spin_lock(&cifs_tcp_ses_lock);

  	list_for_each(tmp, &server->smb_ses_list) {

  		ses = list_entry(tmp, struct cifs_ses, smb_ses_list);

  		ses->need_reconnect = true;
  		ses->ipc_tid = 0;

  		list_for_each(tmp2, &ses->tcon_list) {

  			tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);

  			tcon->need_reconnect = true;

  		}

  	}

  	spin_unlock(&cifs_tcp_ses_lock);

  	/* do not want to be sending data on a socket we are freeing */

  	cFYI(1, "%s: tearing down socket", __func__);

  	mutex_lock(&server->srv_mutex);

  	if (server->ssocket) {

  		cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
  			server->ssocket->flags);

  		kernel_sock_shutdown(server->ssocket, SHUT_WR);

  		cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",

  			server->ssocket->state,

  			server->ssocket->flags);

  		sock_release(server->ssocket);
  		server->ssocket = NULL;
  	}

  	server->sequence_number = 0;
  	server->session_estab = false;

  	kfree(server->session_key.response);
  	server->session_key.response = NULL;
  	server->session_key.len = 0;

  	server->lstrp = jiffies;

  	mutex_unlock(&server->srv_mutex);

  	/* mark submitted MIDs for retry and issue callback */

  	INIT_LIST_HEAD(&retry_list);
  	cFYI(1, "%s: moving mids to private list", __func__);

  	spin_lock(&GlobalMid_Lock);

  	list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
  		mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
  		if (mid_entry->midState == MID_REQUEST_SUBMITTED)

  			mid_entry->midState = MID_RETRY_NEEDED;

  		list_move(&mid_entry->qhead, &retry_list);
  	}
  	spin_unlock(&GlobalMid_Lock);
  
  	cFYI(1, "%s: issuing mid callbacks", __func__);
  	list_for_each_safe(tmp, tmp2, &retry_list) {
  		mid_entry = list_entry(tmp, struct mid_q_entry, qhead);

  		list_del_init(&mid_entry->qhead);
  		mid_entry->callback(mid_entry);

  	}

  	do {

  		try_to_freeze();

  
  		/* we should try only the port we connected to before */
  		rc = generic_ip_connect(server);

  		if (rc) {

  			cFYI(1, "reconnect error %d", rc);

  			msleep(3000);

  		} else {
  			atomic_inc(&tcpSesReconnectCount);
  			spin_lock(&GlobalMid_Lock);

  			if (server->tcpStatus != CifsExiting)

  				server->tcpStatus = CifsNeedNegotiate;

  			spin_unlock(&GlobalMid_Lock);

  		}

  	} while (server->tcpStatus == CifsNeedReconnect);

  	return rc;
  }

  /*

  	return codes:
  		0 	not a transact2, or all data present
  		>0 	transact2 with that much data missing
  		-EINVAL = invalid transact2
  
   */

  static int check2ndT2(struct smb_hdr *pSMB)

  {

  	struct smb_t2_rsp *pSMBt;

  	int remaining;

  	__u16 total_data_size, data_in_this_rsp;

  	if (pSMB->Command != SMB_COM_TRANSACTION2)

  		return 0;

  	/* check for plausible wct, bcc and t2 data and parm sizes */
  	/* check for parm and data offset going beyond end of smb */
  	if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */

  		cFYI(1, "invalid transact2 word count");

  		return -EINVAL;
  	}
  
  	pSMBt = (struct smb_t2_rsp *)pSMB;

  	total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
  	data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);

  	if (total_data_size == data_in_this_rsp)

  		return 0;

  	else if (total_data_size < data_in_this_rsp) {

  		cFYI(1, "total data %d smaller than data in frame %d",
  			total_data_size, data_in_this_rsp);

  		return -EINVAL;

  	}

  
  	remaining = total_data_size - data_in_this_rsp;
  
  	cFYI(1, "missing %d bytes from transact2, check next response",
  		remaining);

  	if (total_data_size > CIFSMaxBufSize) {

  		cERROR(1, "TotalDataSize %d is over maximum buffer %d",

  			total_data_size, CIFSMaxBufSize);

  		return -EINVAL;
  	}
  	return remaining;

  }

  static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)

  {
  	struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
  	struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)pTargetSMB;

  	char *data_area_of_target;
  	char *data_area_of_buf2;

  	int remaining;

  	unsigned int byte_count, total_in_buf;
  	__u16 total_data_size, total_in_buf2;

  	total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);

  	if (total_data_size !=
  	    get_unaligned_le16(&pSMB2->t2_rsp.TotalDataCount))

  		cFYI(1, "total data size of primary and secondary t2 differ");

  	total_in_buf = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);

  
  	remaining = total_data_size - total_in_buf;

  	if (remaining < 0)

  		return -EPROTO;

  	if (remaining == 0) /* nothing to do, ignore */

  		return 0;

  	total_in_buf2 = get_unaligned_le16(&pSMB2->t2_rsp.DataCount);

  	if (remaining < total_in_buf2) {

  		cFYI(1, "transact2 2nd response contains too much data");

  	}
  
  	/* find end of first SMB data area */

  	data_area_of_target = (char *)&pSMBt->hdr.Protocol +

  				get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);

  	/* validate target area */

  	data_area_of_buf2 = (char *)&pSMB2->hdr.Protocol +
  				get_unaligned_le16(&pSMB2->t2_rsp.DataOffset);

  
  	data_area_of_target += total_in_buf;
  
  	/* copy second buffer into end of first buffer */

  	total_in_buf += total_in_buf2;

  	/* is the result too big for the field? */
  	if (total_in_buf > USHRT_MAX)
  		return -EPROTO;

  	put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);

  
  	/* fix up the BCC */

  	byte_count = get_bcc(pTargetSMB);

  	byte_count += total_in_buf2;

  	/* is the result too big for the field? */
  	if (byte_count > USHRT_MAX)
  		return -EPROTO;

  	put_bcc(byte_count, pTargetSMB);

  	byte_count = be32_to_cpu(pTargetSMB->smb_buf_length);

  	byte_count += total_in_buf2;

  	/* don't allow buffer to overflow */

  	if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)

  		return -ENOBUFS;

  	pTargetSMB->smb_buf_length = cpu_to_be32(byte_count);

  	memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);

  	if (remaining == total_in_buf2) {

  		cFYI(1, "found the last secondary response");

  		return 0; /* we are done */
  	} else /* more responses to go */
  		return 1;

  }

  static void
  cifs_echo_request(struct work_struct *work)
  {
  	int rc;
  	struct TCP_Server_Info *server = container_of(work,
  					struct TCP_Server_Info, echo.work);

  	/*

  	 * We cannot send an echo until the NEGOTIATE_PROTOCOL request is
  	 * done, which is indicated by maxBuf != 0. Also, no need to ping if
  	 * we got a response recently

  	 */

  	if (server->maxBuf == 0 ||

  	    time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))

  		goto requeue_echo;
  
  	rc = CIFSSMBEcho(server);
  	if (rc)
  		cFYI(1, "Unable to send echo request to server: %s",
  			server->hostname);
  
  requeue_echo:
  	queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
  }

  static bool

  allocate_buffers(struct TCP_Server_Info *server)

  {

  	if (!server->bigbuf) {
  		server->bigbuf = (char *)cifs_buf_get();
  		if (!server->bigbuf) {

  			cERROR(1, "No memory for large SMB response");
  			msleep(3000);
  			/* retry will check if exiting */
  			return false;
  		}

  	} else if (server->large_buf) {

  		/* we are reusing a dirty large buf, clear its start */

  		memset(server->bigbuf, 0, sizeof(struct smb_hdr));

  	}

  	if (!server->smallbuf) {
  		server->smallbuf = (char *)cifs_small_buf_get();
  		if (!server->smallbuf) {

  			cERROR(1, "No memory for SMB response");
  			msleep(1000);
  			/* retry will check if exiting */
  			return false;
  		}
  		/* beginning of smb buffer is cleared in our buf_get */
  	} else {
  		/* if existing small buf clear beginning */

  		memset(server->smallbuf, 0, sizeof(struct smb_hdr));

  	}

  	return true;
  }

  static bool
  server_unresponsive(struct TCP_Server_Info *server)
  {
  	if (echo_retries > 0 && server->tcpStatus == CifsGood &&
  	    time_after(jiffies, server->lstrp +
  				(echo_retries * SMB_ECHO_INTERVAL))) {
  		cERROR(1, "Server %s has not responded in %d seconds. "
  			  "Reconnecting...", server->hostname,
  			  (echo_retries * SMB_ECHO_INTERVAL / HZ));
  		cifs_reconnect(server);
  		wake_up(&server->response_q);
  		return true;
  	}
  
  	return false;
  }

  /*
   * kvec_array_init - clone a kvec array, and advance into it
   * @new:	pointer to memory for cloned array
   * @iov:	pointer to original array
   * @nr_segs:	number of members in original array
   * @bytes:	number of bytes to advance into the cloned array
   *
   * This function will copy the array provided in iov to a section of memory
   * and advance the specified number of bytes into the new array. It returns
   * the number of segments in the new array. "new" must be at least as big as
   * the original iov array.
   */
  static unsigned int
  kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
  		size_t bytes)
  {
  	size_t base = 0;
  
  	while (bytes || !iov->iov_len) {
  		int copy = min(bytes, iov->iov_len);
  
  		bytes -= copy;
  		base += copy;
  		if (iov->iov_len == base) {
  			iov++;
  			nr_segs--;
  			base = 0;
  		}
  	}
  	memcpy(new, iov, sizeof(*iov) * nr_segs);
  	new->iov_base += base;
  	new->iov_len -= base;
  	return nr_segs;
  }

  static struct kvec *
  get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)

  {

  	struct kvec *new_iov;
  
  	if (server->iov && nr_segs <= server->nr_iov)
  		return server->iov;
  
  	/* not big enough -- allocate a new one and release the old */
  	new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
  	if (new_iov) {
  		kfree(server->iov);
  		server->iov = new_iov;
  		server->nr_iov = nr_segs;
  	}
  	return new_iov;
  }

  int
  cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
  		       unsigned int nr_segs, unsigned int to_read)

  {

  	int length = 0;
  	int total_read;

  	unsigned int segs;

  	struct msghdr smb_msg;

  	struct kvec *iov;

  	iov = get_server_iovec(server, nr_segs);

  	if (!iov)
  		return -ENOMEM;

  	smb_msg.msg_control = NULL;
  	smb_msg.msg_controllen = 0;

  	for (total_read = 0; to_read; total_read += length, to_read -= length) {

  		try_to_freeze();

  		if (server_unresponsive(server)) {

  			total_read = -EAGAIN;

  			break;
  		}

  		segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
  
  		length = kernel_recvmsg(server->ssocket, &smb_msg,
  					iov, segs, to_read, 0);

  		if (server->tcpStatus == CifsExiting) {

  			total_read = -ESHUTDOWN;

  			break;
  		} else if (server->tcpStatus == CifsNeedReconnect) {
  			cifs_reconnect(server);

  			total_read = -EAGAIN;

  			break;
  		} else if (length == -ERESTARTSYS ||
  			   length == -EAGAIN ||
  			   length == -EINTR) {
  			/*
  			 * Minimum sleep to prevent looping, allowing socket
  			 * to clear and app threads to set tcpStatus
  			 * CifsNeedReconnect if server hung.
  			 */
  			usleep_range(1000, 2000);
  			length = 0;

  			continue;

  		} else if (length <= 0) {

  			cFYI(1, "Received no data or error: expecting %d "
  				"got %d", to_read, length);

  			cifs_reconnect(server);

  			total_read = -EAGAIN;

  			break;
  		}
  	}

  	return total_read;

  }

  int
  cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
  		      unsigned int to_read)

  {
  	struct kvec iov;
  
  	iov.iov_base = buf;
  	iov.iov_len = to_read;

  	return cifs_readv_from_socket(server, &iov, 1, to_read);

  }

  static bool

  is_smb_response(struct TCP_Server_Info *server, unsigned char type)

  {

  	/*
  	 * The first byte big endian of the length field,
  	 * is actually not part of the length but the type
  	 * with the most common, zero, as regular data.
  	 */

  	switch (type) {
  	case RFC1002_SESSION_MESSAGE:
  		/* Regular SMB response */
  		return true;
  	case RFC1002_SESSION_KEEP_ALIVE:
  		cFYI(1, "RFC 1002 session keep alive");
  		break;
  	case RFC1002_POSITIVE_SESSION_RESPONSE:
  		cFYI(1, "RFC 1002 positive session response");
  		break;
  	case RFC1002_NEGATIVE_SESSION_RESPONSE:

  		/*
  		 * We get this from Windows 98 instead of an error on
  		 * SMB negprot response.
  		 */

  		cFYI(1, "RFC 1002 negative session response");

  		/* give server a second to clean up */
  		msleep(1000);
  		/*
  		 * Always try 445 first on reconnect since we get NACK
  		 * on some if we ever connected to port 139 (the NACK
  		 * is since we do not begin with RFC1001 session
  		 * initialize frame).
  		 */

  		cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);

  		cifs_reconnect(server);
  		wake_up(&server->response_q);

  		break;
  	default:
  		cERROR(1, "RFC 1002 unknown response type 0x%x", type);

  		cifs_reconnect(server);

  	}

  	return false;

  }

  static struct mid_q_entry *

  find_mid(struct TCP_Server_Info *server, struct smb_hdr *buf)

  {

  	struct mid_q_entry *mid;

  
  	spin_lock(&GlobalMid_Lock);

  	list_for_each_entry(mid, &server->pending_mid_q, qhead) {
  		if (mid->mid == buf->Mid &&
  		    mid->midState == MID_REQUEST_SUBMITTED &&
  		    mid->command == buf->Command) {
  			spin_unlock(&GlobalMid_Lock);
  			return mid;

  		}

  	}
  	spin_unlock(&GlobalMid_Lock);
  	return NULL;
  }

  void
  dequeue_mid(struct mid_q_entry *mid, bool malformed)

  {

  #ifdef CONFIG_CIFS_STATS2

  	mid->when_received = jiffies;

  #endif

  	spin_lock(&GlobalMid_Lock);
  	if (!malformed)
  		mid->midState = MID_RESPONSE_RECEIVED;
  	else
  		mid->midState = MID_RESPONSE_MALFORMED;
  	list_del_init(&mid->qhead);

  	spin_unlock(&GlobalMid_Lock);

  }

  static void
  handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
  	   struct smb_hdr *buf, int malformed)

  {

  	if (malformed == 0 && check2ndT2(buf) > 0) {
  		mid->multiRsp = true;

  		if (mid->resp_buf) {
  			/* merge response - fix up 1st*/

  			malformed = coalesce_t2(buf, mid->resp_buf);
  			if (malformed > 0)

  				return;

  			/* All parts received or packet is malformed. */
  			mid->multiEnd = true;

  			return dequeue_mid(mid, malformed);

  		}

  		if (!server->large_buf) {

  			/*FIXME: switch to already allocated largebuf?*/
  			cERROR(1, "1st trans2 resp needs bigbuf");
  		} else {
  			/* Have first buffer */
  			mid->resp_buf = buf;
  			mid->largeBuf = true;

  			server->bigbuf = NULL;

  		}

  		return;

  	}
  	mid->resp_buf = buf;

  	mid->largeBuf = server->large_buf;
  	/* Was previous buf put in mpx struct for multi-rsp? */
  	if (!mid->multiRsp) {
  		/* smb buffer will be freed by user thread */
  		if (server->large_buf)
  			server->bigbuf = NULL;
  		else
  			server->smallbuf = NULL;
  	}

  	dequeue_mid(mid, malformed);

  }

  static void clean_demultiplex_info(struct TCP_Server_Info *server)
  {
  	int length;
  
  	/* take it off the list, if it's not already */
  	spin_lock(&cifs_tcp_ses_lock);
  	list_del_init(&server->tcp_ses_list);
  	spin_unlock(&cifs_tcp_ses_lock);
  
  	spin_lock(&GlobalMid_Lock);
  	server->tcpStatus = CifsExiting;
  	spin_unlock(&GlobalMid_Lock);
  	wake_up_all(&server->response_q);
  
  	/*
  	 * Check if we have blocked requests that need to free. Note that
  	 * cifs_max_pending is normally 50, but can be set at module install
  	 * time to as little as two.
  	 */
  	spin_lock(&GlobalMid_Lock);
  	if (atomic_read(&server->inFlight) >= cifs_max_pending)
  		atomic_set(&server->inFlight, cifs_max_pending - 1);
  	/*
  	 * We do not want to set the max_pending too low or we could end up
  	 * with the counter going negative.
  	 */
  	spin_unlock(&GlobalMid_Lock);
  	/*
  	 * Although there should not be any requests blocked on this queue it
  	 * can not hurt to be paranoid and try to wake up requests that may
  	 * haven been blocked when more than 50 at time were on the wire to the
  	 * same server - they now will see the session is in exit state and get
  	 * out of SendReceive.
  	 */
  	wake_up_all(&server->request_q);
  	/* give those requests time to exit */
  	msleep(125);
  
  	if (server->ssocket) {
  		sock_release(server->ssocket);
  		server->ssocket = NULL;
  	}
  
  	if (!list_empty(&server->pending_mid_q)) {
  		struct list_head dispose_list;
  		struct mid_q_entry *mid_entry;
  		struct list_head *tmp, *tmp2;
  
  		INIT_LIST_HEAD(&dispose_list);
  		spin_lock(&GlobalMid_Lock);
  		list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
  			mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
  			cFYI(1, "Clearing mid 0x%x", mid_entry->mid);
  			mid_entry->midState = MID_SHUTDOWN;
  			list_move(&mid_entry->qhead, &dispose_list);
  		}
  		spin_unlock(&GlobalMid_Lock);
  
  		/* now walk dispose list and issue callbacks */
  		list_for_each_safe(tmp, tmp2, &dispose_list) {
  			mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
  			cFYI(1, "Callback mid 0x%x", mid_entry->mid);
  			list_del_init(&mid_entry->qhead);
  			mid_entry->callback(mid_entry);
  		}
  		/* 1/8th of sec is more than enough time for them to exit */
  		msleep(125);
  	}
  
  	if (!list_empty(&server->pending_mid_q)) {
  		/*
  		 * mpx threads have not exited yet give them at least the smb
  		 * send timeout time for long ops.
  		 *
  		 * Due to delays on oplock break requests, we need to wait at
  		 * least 45 seconds before giving up on a request getting a
  		 * response and going ahead and killing cifsd.
  		 */
  		cFYI(1, "Wait for exit from demultiplex thread");
  		msleep(46000);
  		/*
  		 * If threads still have not exited they are probably never
  		 * coming home not much else we can do but free the memory.
  		 */
  	}
  
  	kfree(server->hostname);

  	kfree(server->iov);

  	kfree(server);
  
  	length = atomic_dec_return(&tcpSesAllocCount);
  	if (length > 0)
  		mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
  				GFP_KERNEL);
  }

  static int

  standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
  {
  	int length;
  	char *buf = server->smallbuf;
  	struct smb_hdr *smb_buffer = (struct smb_hdr *)buf;
  	unsigned int pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
  
  	/* make sure this will fit in a large buffer */
  	if (pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
  		cERROR(1, "SMB response too long (%u bytes)",
  			pdu_length);
  		cifs_reconnect(server);
  		wake_up(&server->response_q);
  		return -EAGAIN;
  	}
  
  	/* switch to large buffer if too big for a small one */
  	if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
  		server->large_buf = true;
  		memcpy(server->bigbuf, server->smallbuf, server->total_read);
  		buf = server->bigbuf;
  		smb_buffer = (struct smb_hdr *)buf;
  	}
  
  	/* now read the rest */

  	length = cifs_read_from_socket(server,

  			  buf + sizeof(struct smb_hdr) - 1,
  			  pdu_length - sizeof(struct smb_hdr) + 1 + 4);
  	if (length < 0)
  		return length;
  	server->total_read += length;
  
  	dump_smb(smb_buffer, server->total_read);
  
  	/*
  	 * We know that we received enough to get to the MID as we
  	 * checked the pdu_length earlier. Now check to see
  	 * if the rest of the header is OK. We borrow the length
  	 * var for the rest of the loop to avoid a new stack var.
  	 *
  	 * 48 bytes is enough to display the header and a little bit
  	 * into the payload for debugging purposes.
  	 */
  	length = checkSMB(smb_buffer, smb_buffer->Mid, server->total_read);
  	if (length != 0)
  		cifs_dump_mem("Bad SMB: ", buf,
  			min_t(unsigned int, server->total_read, 48));
  
  	if (mid)
  		handle_mid(mid, server, smb_buffer, length);
  
  	return length;
  }
  
  static int

  cifs_demultiplex_thread(void *p)

  {
  	int length;

  	struct TCP_Server_Info *server = p;

  	unsigned int pdu_length;
  	char *buf = NULL;

  	struct smb_hdr *smb_buffer = NULL;

  	struct task_struct *task_to_wake = NULL;
  	struct mid_q_entry *mid_entry;

  	current->flags |= PF_MEMALLOC;

  	cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));

  
  	length = atomic_inc_return(&tcpSesAllocCount);
  	if (length > 1)

  		mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
  				GFP_KERNEL);

  	set_freezable();

  	while (server->tcpStatus != CifsExiting) {

  		if (try_to_freeze())
  			continue;

  		if (!allocate_buffers(server))

  			continue;

  		server->large_buf = false;
  		smb_buffer = (struct smb_hdr *)server->smallbuf;
  		buf = server->smallbuf;

  		pdu_length = 4; /* enough to get RFC1001 header */

  		length = cifs_read_from_socket(server, buf, pdu_length);

  		if (length < 0)

  			continue;

  		server->total_read = length;

  		/*
  		 * The right amount was read from socket - 4 bytes,
  		 * so we can now interpret the length field.
  		 */

  		pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);

  		cFYI(1, "RFC1002 header 0x%x", pdu_length);
  		if (!is_smb_response(server, buf[0]))

  			continue;

  		/* make sure we have enough to get to the MID */
  		if (pdu_length < sizeof(struct smb_hdr) - 1 - 4) {
  			cERROR(1, "SMB response too short (%u bytes)",
  				pdu_length);
  			cifs_reconnect(server);
  			wake_up(&server->response_q);
  			continue;

  		}

  		/* read down to the MID */

  		length = cifs_read_from_socket(server, buf + 4,
  					sizeof(struct smb_hdr) - 1 - 4);

  		if (length < 0)

  			continue;

  		server->total_read += length;

  		mid_entry = find_mid(server, smb_buffer);

  		if (!mid_entry || !mid_entry->receive)
  			length = standard_receive3(server, mid_entry);
  		else
  			length = mid_entry->receive(server, mid_entry);

  		if (length < 0)

  			continue;

  		if (server->large_buf) {

  			buf = server->bigbuf;

  			smb_buffer = (struct smb_hdr *)buf;

  		}

  		server->lstrp = jiffies;

  		if (mid_entry != NULL) {

  			if (!mid_entry->multiRsp || mid_entry->multiEnd)
  				mid_entry->callback(mid_entry);

  		} else if (!is_valid_oplock_break(smb_buffer, server)) {

  			cERROR(1, "No task to wake, unknown frame received! "

  				   "NumMids %d", atomic_read(&midCount));

  			cifs_dump_mem("Received Data is: ", buf,

  				      sizeof(struct smb_hdr));

  #ifdef CONFIG_CIFS_DEBUG2
  			cifs_dump_detail(smb_buffer);
  			cifs_dump_mids(server);
  #endif /* CIFS_DEBUG2 */

  		}
  	} /* end while !EXITING */

  	/* buffer usually freed in free_mid - need to free it here on exit */

  	cifs_buf_release(server->bigbuf);
  	if (server->smallbuf) /* no sense logging a debug message if NULL */
  		cifs_small_buf_release(server->smallbuf);

  	task_to_wake = xchg(&server->tsk, NULL);

  	clean_demultiplex_info(server);

  	/* if server->tsk was NULL then wait for a signal before exiting */
  	if (!task_to_wake) {
  		set_current_state(TASK_INTERRUPTIBLE);
  		while (!signal_pending(current)) {
  			schedule();
  			set_current_state(TASK_INTERRUPTIBLE);
  		}
  		set_current_state(TASK_RUNNING);
  	}

  	module_put_and_exit(0);

  }

  /* extract the host portion of the UNC string */
  static char *
  extract_hostname(const char *unc)
  {
  	const char *src;
  	char *dst, *delim;
  	unsigned int len;
  
  	/* skip double chars at beginning of string */
  	/* BB: check validity of these bytes? */
  	src = unc + 2;
  
  	/* delimiter between hostname and sharename is always '\\' now */
  	delim = strchr(src, '\\');
  	if (!delim)
  		return ERR_PTR(-EINVAL);
  
  	len = delim - src;
  	dst = kmalloc((len + 1), GFP_KERNEL);
  	if (dst == NULL)
  		return ERR_PTR(-ENOMEM);
  
  	memcpy(dst, src, len);
  	dst[len] = '\0';
  
  	return dst;
  }

  static int

  cifs_parse_mount_options(const char *mountdata, const char *devname,

  			 struct smb_vol *vol)

  {

  	char *value, *data, *end;

  	char *mountdata_copy = NULL, *options;

  	int err;

  	unsigned int  temp_len, i, j;
  	char separator[2];

  	short int override_uid = -1;
  	short int override_gid = -1;
  	bool uid_specified = false;
  	bool gid_specified = false;

  	char *nodename = utsname()->nodename;

  
  	separator[0] = ',';

  	separator[1] = 0;

  	/*
  	 * does not have to be perfect mapping since field is
  	 * informational, only used for servers that do not support
  	 * port 445 and it can be overridden at mount time
  	 */

  	memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
  	for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)

  		vol->source_rfc1001_name[i] = toupper(nodename[i]);

  	vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;

  	/* null target name indicates to use *SMBSERVR default called name
  	   if we end up sending RFC1001 session initialize */
  	vol->target_rfc1001_name[0] = 0;

  	vol->cred_uid = current_uid();
  	vol->linux_uid = current_uid();

  	vol->linux_gid = current_gid();

  
  	/* default to only allowing write access to owner of the mount */
  	vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;

  
  	/* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */

  	/* default is always to request posix paths. */
  	vol->posix_paths = 1;

  	/* default to using server inode numbers where available */
  	vol->server_ino = 1;

  	vol->actimeo = CIFS_DEF_ACTIMEO;

  	if (!mountdata)
  		goto cifs_parse_mount_err;
  
  	mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
  	if (!mountdata_copy)
  		goto cifs_parse_mount_err;

  	options = mountdata_copy;

  	end = options + strlen(options);

  	if (strncmp(options, "sep=", 4) == 0) {

  		if (options[4] != 0) {

  			separator[0] = options[4];
  			options += 5;
  		} else {

  			cFYI(1, "Null separator not allowed");

  		}
  	}

  	vol->backupuid_specified = false; /* no backup intent for a user */
  	vol->backupgid_specified = false; /* no backup intent for a group */

  	while ((data = strsep(&options, separator)) != NULL) {
  		if (!*data)
  			continue;
  		if ((value = strchr(data, '=')) != NULL)
  			*value++ = '\0';

  		/* Have to parse this before we parse for "user" */
  		if (strnicmp(data, "user_xattr", 10) == 0) {

  			vol->no_xattr = 0;

  		} else if (strnicmp(data, "nouser_xattr", 12) == 0) {

  			vol->no_xattr = 1;
  		} else if (strnicmp(data, "user", 4) == 0) {

  			if (!value) {

  				printk(KERN_WARNING
  				       "CIFS: invalid or missing username
  ");

  				goto cifs_parse_mount_err;

  			} else if (!*value) {

  				/* null user, ie anonymous, authentication */
  				vol->nullauth = 1;

  			}

  			if (strnlen(value, MAX_USERNAME_SIZE) <
  						MAX_USERNAME_SIZE) {

  				vol->username = kstrdup(value, GFP_KERNEL);
  				if (!vol->username) {
  					printk(KERN_WARNING "CIFS: no memory "
  							    "for username
  ");
  					goto cifs_parse_mount_err;
  				}

  			} else {
  				printk(KERN_WARNING "CIFS: username too long
  ");

  				goto cifs_parse_mount_err;

  			}
  		} else if (strnicmp(data, "pass", 4) == 0) {
  			if (!value) {
  				vol->password = NULL;
  				continue;

  			} else if (value[0] == 0) {

  				/* check if string begins with double comma
  				   since that would mean the password really
  				   does start with a comma, and would not
  				   indicate an empty string */

  				if (value[1] != separator[0]) {

  					vol->password = NULL;
  					continue;
  				}
  			}
  			temp_len = strlen(value);
  			/* removed password length check, NTLM passwords
  				can be arbitrarily long */

  			/* if comma in password, the string will be

  			prematurely null terminated.  Commas in password are
  			specified across the cifs mount interface by a double
  			comma ie ,, and a comma used as in other cases ie ','
  			as a parameter delimiter/separator is single and due
  			to the strsep above is temporarily zeroed. */
  
  			/* NB: password legally can have multiple commas and
  			the only illegal character in a password is null */

  			if ((value[temp_len] == 0) &&

  			    (value + temp_len < end) &&

  			    (value[temp_len+1] == separator[0])) {

  				/* reinsert comma */
  				value[temp_len] = separator[0];

  				temp_len += 2;  /* move after second comma */
  				while (value[temp_len] != 0)  {

  					if (value[temp_len] == separator[0]) {

  						if (value[temp_len+1] ==

  						     separator[0]) {
  						/* skip second comma */
  							temp_len++;

  						} else {

  						/* single comma indicating start
  							 of next parm */
  							break;
  						}
  					}
  					temp_len++;
  				}

  				if (value[temp_len] == 0) {

  					options = NULL;
  				} else {
  					value[temp_len] = 0;
  					/* point option to start of next parm */
  					options = value + temp_len + 1;
  				}

  				/* go from value to value + temp_len condensing

  				double commas to singles. Note that this ends up
  				allocating a few bytes too many, which is ok */

  				vol->password = kzalloc(temp_len, GFP_KERNEL);

  				if (vol->password == NULL) {

  					printk(KERN_WARNING "CIFS: no memory "
  							    "for password
  ");

  					goto cifs_parse_mount_err;

  				}

  				for (i = 0, j = 0; i < temp_len; i++, j++) {

  					vol->password[j] = value[i];

  					if (value[i] == separator[0]

  						&& value[i+1] == separator[0]) {

  						/* skip second comma */
  						i++;
  					}
  				}
  				vol->password[j] = 0;
  			} else {

  				vol->password = kzalloc(temp_len+1, GFP_KERNEL);

  				if (vol->password == NULL) {

  					printk(KERN_WARNING "CIFS: no memory "
  							    "for password
  ");

  					goto cifs_parse_mount_err;

  				}

  				strcpy(vol->password, value);
  			}

  		} else if (!strnicmp(data, "ip", 2) ||
  			   !strnicmp(data, "addr", 4)) {

  			if (!value || !*value) {
  				vol->UNCip = NULL;

  			} else if (strnlen(value, INET6_ADDRSTRLEN) <
  							INET6_ADDRSTRLEN) {

  				vol->UNCip = kstrdup(value, GFP_KERNEL);
  				if (!vol->UNCip) {
  					printk(KERN_WARNING "CIFS: no memory "
  							    "for UNC IP
  ");
  					goto cifs_parse_mount_err;
  				}

  			} else {

  				printk(KERN_WARNING "CIFS: ip address "
  						    "too long
  ");

  				goto cifs_parse_mount_err;

  			}

  		} else if (strnicmp(data, "sec", 3) == 0) {
  			if (!value || !*value) {

  				cERROR(1, "no security value specified");

  				continue;
  			} else if (strnicmp(value, "krb5i", 5) == 0) {
  				vol->secFlg |= CIFSSEC_MAY_KRB5 |

  					CIFSSEC_MUST_SIGN;

  			} else if (strnicmp(value, "krb5p", 5) == 0) {

  				/* vol->secFlg |= CIFSSEC_MUST_SEAL |
  					CIFSSEC_MAY_KRB5; */

  				cERROR(1, "Krb5 cifs privacy not supported");

  				goto cifs_parse_mount_err;

  			} else if (strnicmp(value, "krb5", 4) == 0) {

  				vol->secFlg |= CIFSSEC_MAY_KRB5;

  			} else if (strnicmp(value, "ntlmsspi", 8) == 0) {
  				vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
  					CIFSSEC_MUST_SIGN;
  			} else if (strnicmp(value, "ntlmssp", 7) == 0) {
  				vol->secFlg |= CIFSSEC_MAY_NTLMSSP;

  			} else if (strnicmp(value, "ntlmv2i", 7) == 0) {

  				vol->secFlg |= CIFSSEC_MAY_NTLMV2 |

  					CIFSSEC_MUST_SIGN;

  			} else if (strnicmp(value, "ntlmv2", 6) == 0) {

  				vol->secFlg |= CIFSSEC_MAY_NTLMV2;

  			} else if (strnicmp(value, "ntlmi", 5) == 0) {

  				vol->secFlg |= CIFSSEC_MAY_NTLM |

  					CIFSSEC_MUST_SIGN;

  			} else if (strnicmp(value, "ntlm", 4) == 0) {
  				/* ntlm is default so can be turned off too */

  				vol->secFlg |= CIFSSEC_MAY_NTLM;

  			} else if (strnicmp(value, "nontlm", 6) == 0) {

  				/* BB is there a better way to do this? */

  				vol->secFlg |= CIFSSEC_MAY_NTLMV2;

  #ifdef CONFIG_CIFS_WEAK_PW_HASH
  			} else if (strnicmp(value, "lanman", 6) == 0) {

  				vol->secFlg |= CIFSSEC_MAY_LANMAN;

  #endif

  			} else if (strnicmp(value, "none", 4) == 0) {

  				vol->nullauth = 1;

  			} else {

  				cERROR(1, "bad security option: %s", value);

  				goto cifs_parse_mount_err;

  			}

  		} else if (strnicmp(data, "vers", 3) == 0) {
  			if (!value || !*value) {
  				cERROR(1, "no protocol version specified"
  					  " after vers= mount option");
  			} else if ((strnicmp(value, "cifs", 4) == 0) ||
  				   (strnicmp(value, "1", 1) == 0)) {
  				/* this is the default */
  				continue;

  			}

  		} else if ((strnicmp(data, "unc", 3) == 0)
  			   || (strnicmp(data, "target", 6) == 0)
  			   || (strnicmp(data, "path", 4) == 0)) {
  			if (!value || !*value) {

  				printk(KERN_WARNING "CIFS: invalid path to "
  						    "network resource
  ");

  				goto cifs_parse_mount_err;

  			}
  			if ((temp_len = strnlen(value, 300)) < 300) {

  				vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);

  				if (vol->UNC == NULL)

  					goto cifs_parse_mount_err;

  				strcpy(vol->UNC, value);

  				if (strncmp(vol->UNC, "//", 2) == 0) {
  					vol->UNC[0] = '\\';
  					vol->UNC[1] = '\\';

  				} else if (strncmp(vol->UNC, "\\\\", 2) != 0) {

  					printk(KERN_WARNING

  					       "CIFS: UNC Path does not begin "
  					       "with // or \\\\ 
  ");

  					goto cifs_parse_mount_err;

  				}
  			} else {
  				printk(KERN_WARNING "CIFS: UNC name too long
  ");

  				goto cifs_parse_mount_err;

  			}
  		} else if ((strnicmp(data, "domain", 3) == 0)
  			   || (strnicmp(data, "workgroup", 5) == 0)) {
  			if (!value || !*value) {
  				printk(KERN_WARNING "CIFS: invalid domain name
  ");

  				goto cifs_parse_mount_err;

  			}
  			/* BB are there cases in which a comma can be valid in
  			a domain name and need special handling? */

  			if (strnlen(value, 256) < 256) {

  				vol->domainname = kstrdup(value, GFP_KERNEL);
  				if (!vol->domainname) {
  					printk(KERN_WARNING "CIFS: no memory "
  							    "for domainname
  ");
  					goto cifs_parse_mount_err;
  				}

  				cFYI(1, "Domain name set");

  			} else {

  				printk(KERN_WARNING "CIFS: domain name too "
  						    "long
  ");

  				goto cifs_parse_mount_err;

  			}

  		} else if (strnicmp(data, "srcaddr", 7) == 0) {
  			vol->srcaddr.ss_family = AF_UNSPEC;
  
  			if (!value || !*value) {
  				printk(KERN_WARNING "CIFS: srcaddr value"
  				       " not specified.
  ");

  				goto cifs_parse_mount_err;

  			}
  			i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
  						 value, strlen(value));

  			if (i == 0) {

  				printk(KERN_WARNING "CIFS:  Could not parse"
  				       " srcaddr: %s
  ",
  				       value);

  				goto cifs_parse_mount_err;

  			}

  		} else if (strnicmp(data, "prefixpath", 10) == 0) {
  			if (!value || !*value) {
  				printk(KERN_WARNING
  					"CIFS: invalid path prefix
  ");

  				goto cifs_parse_mount_err;

  			}
  			if ((temp_len = strnlen(value, 1024)) < 1024) {

  				if (value[0] != '/')

  					temp_len++;  /* missing leading slash */

  				vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
  				if (vol->prepath == NULL)

  					goto cifs_parse_mount_err;

  				if (value[0] != '/') {

  					vol->prepath[0] = '/';

  					strcpy(vol->prepath+1, value);

  				} else

  					strcpy(vol->prepath, value);

  				cFYI(1, "prefix path %s", vol->prepath);

  			} else {
  				printk(KERN_WARNING "CIFS: prefix too long
  ");

  				goto cifs_parse_mount_err;

  			}

  		} else if (strnicmp(data, "iocharset", 9) == 0) {
  			if (!value || !*value) {

  				printk(KERN_WARNING "CIFS: invalid iocharset "
  						    "specified
  ");

  				goto cifs_parse_mount_err;

  			}
  			if (strnlen(value, 65) < 65) {

  				if (strnicmp(value, "default", 7)) {
  					vol->iocharset = kstrdup(value,
  								 GFP_KERNEL);
  
  					if (!vol->iocharset) {
  						printk(KERN_WARNING "CIFS: no "
  								   "memory for"
  								   "charset
  ");
  						goto cifs_parse_mount_err;
  					}
  				}

  				/* if iocharset not set then load_nls_default
  				   is used by caller */

  				cFYI(1, "iocharset set to %s", value);

  			} else {

  				printk(KERN_WARNING "CIFS: iocharset name "
  						    "too long.
  ");

  				goto cifs_parse_mount_err;

  			}

  		} else if (!strnicmp(data, "uid", 3) && value && *value) {
  			vol->linux_uid = simple_strtoul(value, &value, 0);
  			uid_specified = true;

  		} else if (!strnicmp(data, "cruid", 5) && value && *value) {
  			vol->cred_uid = simple_strtoul(value, &value, 0);

  		} else if (!strnicmp(data, "forceuid", 8)) {
  			override_uid = 1;
  		} else if (!strnicmp(data, "noforceuid", 10)) {
  			override_uid = 0;
  		} else if (!strnicmp(data, "gid", 3) && value && *value) {
  			vol->linux_gid = simple_strtoul(value, &value, 0);
  			gid_specified = true;
  		} else if (!strnicmp(data, "forcegid", 8)) {
  			override_gid = 1;
  		} else if (!strnicmp(data, "noforcegid", 10)) {
  			override_gid = 0;

  		} else if (strnicmp(data, "file_mode", 4) == 0) {
  			if (value && *value) {
  				vol->file_mode =
  					simple_strtoul(value, &value, 0);
  			}
  		} else if (strnicmp(data, "dir_mode", 4) == 0) {
  			if (value && *value) {
  				vol->dir_mode =
  					simple_strtoul(value, &value, 0);
  			}
  		} else if (strnicmp(data, "dirmode", 4) == 0) {
  			if (value && *value) {
  				vol->dir_mode =
  					simple_strtoul(value, &value, 0);
  			}
  		} else if (strnicmp(data, "port", 4) == 0) {
  			if (value && *value) {
  				vol->port =
  					simple_strtoul(value, &value, 0);
  			}
  		} else if (strnicmp(data, "rsize", 5) == 0) {
  			if (value && *value) {
  				vol->rsize =
  					simple_strtoul(value, &value, 0);
  			}
  		} else if (strnicmp(data, "wsize", 5) == 0) {
  			if (value && *value) {
  				vol->wsize =
  					simple_strtoul(value, &value, 0);
  			}
  		} else if (strnicmp(data, "sockopt", 5) == 0) {

  			if (!value || !*value) {

  				cERROR(1, "no socket option specified");

  				continue;
  			} else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
  				vol->sockopt_tcp_nodelay = 1;

  			}
  		} else if (strnicmp(data, "netbiosname", 4) == 0) {
  			if (!value || !*value || (*value == ' ')) {

  				cFYI(1, "invalid (empty) netbiosname");

  			} else {

  				memset(vol->source_rfc1001_name, 0x20,
  					RFC1001_NAME_LEN);
  				/*
  				 * FIXME: are there cases in which a comma can
  				 * be valid in workstation netbios name (and
  				 * need special handling)?
  				 */
  				for (i = 0; i < RFC1001_NAME_LEN; i++) {
  					/* don't ucase netbiosname for user */

  					if (value[i] == 0)

  						break;

  					vol->source_rfc1001_name[i] = value[i];

  				}
  				/* The string has 16th byte zero still from
  				set at top of the function  */

  				if (i == RFC1001_NAME_LEN && value[i] != 0)

  					printk(KERN_WARNING "CIFS: netbiosname"
  						" longer than 15 truncated.
  ");

  			}
  		} else if (strnicmp(data, "servern", 7) == 0) {
  			/* servernetbiosname specified override *SMBSERVER */
  			if (!value || !*value || (*value == ' ')) {

  				cFYI(1, "empty server netbiosname specified");

  			} else {
  				/* last byte, type, is 0x20 for servr type */

  				memset(vol->target_rfc1001_name, 0x20,
  					RFC1001_NAME_LEN_WITH_NULL);

  				for (i = 0; i < 15; i++) {

  				/* BB are there cases in which a comma can be

  				   valid in this workstation netbios name
  				   (and need special handling)? */

  				/* user or mount helper must uppercase
  				   the netbiosname */
  					if (value[i] == 0)

  						break;
  					else

  						vol->target_rfc1001_name[i] =
  								value[i];

  				}
  				/* The string has 16th byte zero still from
  				   set at top of the function  */

  				if (i == RFC1001_NAME_LEN && value[i] != 0)

  					printk(KERN_WARNING "CIFS: server net"
  					"biosname longer than 15 truncated.
  ");

  			}

  		} else if (strnicmp(data, "actimeo", 7) == 0) {
  			if (value && *value) {
  				vol->actimeo = HZ * simple_strtoul(value,
  								   &value, 0);
  				if (vol->actimeo > CIFS_MAX_ACTIMEO) {
  					cERROR(1, "CIFS: attribute cache"
  							"timeout too large");

  					goto cifs_parse_mount_err;

  				}
  			}

  		} else if (strnicmp(data, "credentials", 4) == 0) {
  			/* ignore */
  		} else if (strnicmp(data, "version", 3) == 0) {
  			/* ignore */

  		} else if (strnicmp(data, "guest", 5) == 0) {

  			/* ignore */

  		} else if (strnicmp(data, "rw", 2) == 0 && strlen(data) == 2) {

  			/* ignore */
  		} else if (strnicmp(data, "ro", 2) == 0) {
  			/* ignore */

  		} else if (strnicmp(data, "noblocksend", 11) == 0) {
  			vol->noblocksnd = 1;
  		} else if (strnicmp(data, "noautotune", 10) == 0) {
  			vol->noautotune = 1;

  		} else if ((strnicmp(data, "suid", 4) == 0) ||
  				   (strnicmp(data, "nosuid", 6) == 0) ||
  				   (strnicmp(data, "exec", 4) == 0) ||
  				   (strnicmp(data, "noexec", 6) == 0) ||
  				   (strnicmp(data, "nodev", 5) == 0) ||
  				   (strnicmp(data, "noauto", 6) == 0) ||
  				   (strnicmp(data, "dev", 3) == 0)) {
  			/*  The mount tool or mount.cifs helper (if present)

  			    uses these opts to set flags, and the flags are read
  			    by the kernel vfs layer before we get here (ie
  			    before read super) so there is no point trying to
  			    parse these options again and set anything and it
  			    is ok to just ignore them */

  			continue;

  		} else if (strnicmp(data, "hard", 4) == 0) {
  			vol->retry = 1;
  		} else if (strnicmp(data, "soft", 4) == 0) {
  			vol->retry = 0;
  		} else if (strnicmp(data, "perm", 4) == 0) {
  			vol->noperm = 0;
  		} else if (strnicmp(data, "noperm", 6) == 0) {
  			vol->noperm = 1;

  		} else if (strnicmp(data, "mapchars", 8) == 0) {
  			vol->remap = 1;
  		} else if (strnicmp(data, "nomapchars", 10) == 0) {
  			vol->remap = 0;

  		} else if (strnicmp(data, "sfu", 3) == 0) {
  			vol->sfu_emul = 1;
  		} else if (strnicmp(data, "nosfu", 5) == 0) {
  			vol->sfu_emul = 0;

  		} else if (strnicmp(data, "nodfs", 5) == 0) {
  			vol->nodfs = 1;

  		} else if (strnicmp(data, "posixpaths", 10) == 0) {
  			vol->posix_paths = 1;
  		} else if (strnicmp(data, "noposixpaths", 12) == 0) {
  			vol->posix_paths = 0;

  		} else if (strnicmp(data, "nounix", 6) == 0) {
  			vol->no_linux_ext = 1;
  		} else if (strnicmp(data, "nolinux", 7) == 0) {
  			vol->no_linux_ext = 1;

  		} else if ((strnicmp(data, "nocase", 6) == 0) ||

  			   (strnicmp(data, "ignorecase", 10)  == 0)) {

  			vol->nocase = 1;

  		} else if (strnicmp(data, "mand", 4) == 0) {
  			/* ignore */
  		} else if (strnicmp(data, "nomand", 6) == 0) {
  			/* ignore */
  		} else if (strnicmp(data, "_netdev", 7) == 0) {
  			/* ignore */

  		} else if (strnicmp(data, "brl", 3) == 0) {
  			vol->nobrl =  0;

  		} else if ((strnicmp(data, "nobrl", 5) == 0) ||

  			   (strnicmp(data, "nolock", 6) == 0)) {

  			vol->nobrl =  1;

  			/* turn off mandatory locking in mode
  			if remote locking is turned off since the
  			local vfs will do advisory */

  			if (vol->file_mode ==
  				(S_IALLUGO & ~(S_ISUID | S_IXGRP)))

  				vol->file_mode = S_IALLUGO;

  		} else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
  			/* will take the shorter form "forcemand" as well */
  			/* This mount option will force use of mandatory
  			  (DOS/Windows style) byte range locks, instead of
  			  using posix advisory byte range locks, even if the
  			  Unix extensions are available and posix locks would
  			  be supported otherwise. If Unix extensions are not
  			  negotiated this has no effect since mandatory locks
  			  would be used (mandatory locks is all that those
  			  those servers support) */
  			vol->mand_lock = 1;

  		} else if (strnicmp(data, "setuids", 7) == 0) {
  			vol->setuids = 1;
  		} else if (strnicmp(data, "nosetuids", 9) == 0) {
  			vol->setuids = 0;

  		} else if (strnicmp(data, "dynperm", 7) == 0) {
  			vol->dynperm = true;
  		} else if (strnicmp(data, "nodynperm", 9) == 0) {
  			vol->dynperm = false;

  		} else if (strnicmp(data, "nohard", 6) == 0) {
  			vol->retry = 0;
  		} else if (strnicmp(data, "nosoft", 6) == 0) {
  			vol->retry = 1;
  		} else if (strnicmp(data, "nointr", 6) == 0) {
  			vol->intr = 0;
  		} else if (strnicmp(data, "intr", 4) == 0) {
  			vol->intr = 1;

  		} else if (strnicmp(data, "nostrictsync", 12) == 0) {
  			vol->nostrictsync = 1;
  		} else if (strnicmp(data, "strictsync", 10) == 0) {
  			vol->nostrictsync = 0;

  		} else if (strnicmp(data, "serverino", 7) == 0) {

  			vol->server_ino = 1;

  		} else if (strnicmp(data, "noserverino", 9) == 0) {

  			vol->server_ino = 0;

  		} else if (strnicmp(data, "rwpidforward", 12) == 0) {

  			vol->rwpidforward = 1;

  		} else if (strnicmp(data, "cifsacl", 7) == 0) {

  			vol->cifs_acl = 1;
  		} else if (strnicmp(data, "nocifsacl", 9) == 0) {
  			vol->cifs_acl = 0;

  		} else if (strnicmp(data, "acl", 3) == 0) {

  			vol->no_psx_acl = 0;

  		} else if (strnicmp(data, "noacl", 5) == 0) {

  			vol->no_psx_acl = 1;

  		} else if (strnicmp(data, "locallease", 6) == 0) {
  			vol->local_lease = 1;

  		} else if (strnicmp(data, "sign", 4) == 0) {

  			vol->secFlg |= CIFSSEC_MUST_SIGN;

  		} else if (strnicmp(data, "seal", 4) == 0) {
  			/* we do not do the following in secFlags because seal
  			   is a per tree connection (mount) not a per socket
  			   or per-smb connection option in the protocol */
  			/* vol->secFlg |= CIFSSEC_MUST_SEAL; */
  			vol->seal = 1;

  		} else if (strnicmp(data, "direct", 6) == 0) {

  			vol->direct_io = 1;

  		} else if (strnicmp(data, "forcedirectio", 13) == 0) {

  			vol->direct_io = 1;

  		} else if (strnicmp(data, "strictcache", 11) == 0) {
  			vol->strict_io = 1;

  		} else if (strnicmp(data, "noac", 4) == 0) {

  			printk(KERN_WARNING "CIFS: Mount option noac not "
  				"supported. Instead set "
  				"/proc/fs/cifs/LookupCacheEnabled to 0
  ");

  		} else if (strnicmp(data, "fsc", 3) == 0) {

  #ifndef CONFIG_CIFS_FSCACHE

  			cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE "

  				  "kernel config option set");

  			goto cifs_parse_mount_err;

  #endif

  			vol->fsc = true;

  		} else if (strnicmp(data, "mfsymlinks", 10) == 0) {
  			vol->mfsymlinks = true;

  		} else if (strnicmp(data, "multiuser", 8) == 0) {
  			vol->multiuser = true;

  		} else if (!strnicmp(data, "backupuid", 9) && value && *value) {
  			err = kstrtouint(value, 0, &vol->backupuid);
  			if (err < 0) {
  				cERROR(1, "%s: Invalid backupuid value",
  					__func__);
  				goto cifs_parse_mount_err;
  			}
  			vol->backupuid_specified = true;
  		} else if (!strnicmp(data, "backupgid", 9) && value && *value) {
  			err = kstrtouint(value, 0, &vol->backupgid);
  			if (err < 0) {
  				cERROR(1, "%s: Invalid backupgid value",
  					__func__);
  				goto cifs_parse_mount_err;
  			}
  			vol->backupgid_specified = true;

  		} else

  			printk(KERN_WARNING "CIFS: Unknown mount option %s
  ",
  						data);

  	}
  	if (vol->UNC == NULL) {

  		if (devname == NULL) {

  			printk(KERN_WARNING "CIFS: Missing UNC name for mount "
  						"target
  ");

  			goto cifs_parse_mount_err;