コード例 #1
0
ファイル: transport.c プロジェクト: AlexShiLucky/linux
int
compound_send_recv(const unsigned int xid, struct cifs_ses *ses,
		   const int flags, const int num_rqst, struct smb_rqst *rqst,
		   int *resp_buf_type, struct kvec *resp_iov)
{
	int i, j, rc = 0;
	int timeout, optype;
	struct mid_q_entry *midQ[MAX_COMPOUND];
	bool cancelled_mid[MAX_COMPOUND] = {false};
	unsigned int credits[MAX_COMPOUND] = {0};
	char *buf;

	timeout = flags & CIFS_TIMEOUT_MASK;
	optype = flags & CIFS_OP_MASK;

	for (i = 0; i < num_rqst; i++)
		resp_buf_type[i] = CIFS_NO_BUFFER;  /* no response buf yet */

	if ((ses == NULL) || (ses->server == NULL)) {
		cifs_dbg(VFS, "Null session\n");
		return -EIO;
	}

	if (ses->server->tcpStatus == CifsExiting)
		return -ENOENT;

	/*
	 * Ensure we obtain 1 credit per request in the compound chain.
	 * It can be optimized further by waiting for all the credits
	 * at once but this can wait long enough if we don't have enough
	 * credits due to some heavy operations in progress or the server
	 * not granting us much, so a fallback to the current approach is
	 * needed anyway.
	 */
	for (i = 0; i < num_rqst; i++) {
		rc = wait_for_free_request(ses->server, timeout, optype);
		if (rc) {
			/*
			 * We haven't sent an SMB packet to the server yet but
			 * we already obtained credits for i requests in the
			 * compound chain - need to return those credits back
			 * for future use. Note that we need to call add_credits
			 * multiple times to match the way we obtained credits
			 * in the first place and to account for in flight
			 * requests correctly.
			 */
			for (j = 0; j < i; j++)
				add_credits(ses->server, 1, optype);
			return rc;
		}
		credits[i] = 1;
	}

	/*
	 * Make sure that we sign in the same order that we send on this socket
	 * and avoid races inside tcp sendmsg code that could cause corruption
	 * of smb data.
	 */

	mutex_lock(&ses->server->srv_mutex);

	for (i = 0; i < num_rqst; i++) {
		midQ[i] = ses->server->ops->setup_request(ses, &rqst[i]);
		if (IS_ERR(midQ[i])) {
			for (j = 0; j < i; j++)
				cifs_delete_mid(midQ[j]);
			mutex_unlock(&ses->server->srv_mutex);

			/* Update # of requests on wire to server */
			for (j = 0; j < num_rqst; j++)
				add_credits(ses->server, credits[j], optype);
			return PTR_ERR(midQ[i]);
		}

		midQ[i]->mid_state = MID_REQUEST_SUBMITTED;
		midQ[i]->optype = optype;
		/*
		 * Invoke callback for every part of the compound chain
		 * to calculate credits properly. Wake up this thread only when
		 * the last element is received.
		 */
		if (i < num_rqst - 1)
			midQ[i]->callback = cifs_compound_callback;
		else
			midQ[i]->callback = cifs_compound_last_callback;
	}
	cifs_in_send_inc(ses->server);
	rc = smb_send_rqst(ses->server, num_rqst, rqst, flags);
	cifs_in_send_dec(ses->server);

	for (i = 0; i < num_rqst; i++)
		cifs_save_when_sent(midQ[i]);

	if (rc < 0)
		ses->server->sequence_number -= 2;

	mutex_unlock(&ses->server->srv_mutex);

	if (rc < 0) {
		/* Sending failed for some reason - return credits back */
		for (i = 0; i < num_rqst; i++)
			add_credits(ses->server, credits[i], optype);
		goto out;
	}

	/*
	 * At this point the request is passed to the network stack - we assume
	 * that any credits taken from the server structure on the client have
	 * been spent and we can't return them back. Once we receive responses
	 * we will collect credits granted by the server in the mid callbacks
	 * and add those credits to the server structure.
	 */

	/*
	 * Compounding is never used during session establish.
	 */
	if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP))
		smb311_update_preauth_hash(ses, rqst[0].rq_iov,
					   rqst[0].rq_nvec);

	if (timeout == CIFS_ASYNC_OP)
		goto out;

	for (i = 0; i < num_rqst; i++) {
		rc = wait_for_response(ses->server, midQ[i]);
		if (rc != 0)
			break;
	}
	if (rc != 0) {
		for (; i < num_rqst; i++) {
			cifs_dbg(VFS, "Cancelling wait for mid %llu cmd: %d\n",
				 midQ[i]->mid, le16_to_cpu(midQ[i]->command));
			send_cancel(ses->server, &rqst[i], midQ[i]);
			spin_lock(&GlobalMid_Lock);
			if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) {
				midQ[i]->mid_flags |= MID_WAIT_CANCELLED;
				midQ[i]->callback = cifs_cancelled_callback;
				cancelled_mid[i] = true;
				credits[i] = 0;
			}
			spin_unlock(&GlobalMid_Lock);
		}
	}

	for (i = 0; i < num_rqst; i++) {
		if (rc < 0)
			goto out;

		rc = cifs_sync_mid_result(midQ[i], ses->server);
		if (rc != 0) {
			/* mark this mid as cancelled to not free it below */
			cancelled_mid[i] = true;
			goto out;
		}

		if (!midQ[i]->resp_buf ||
		    midQ[i]->mid_state != MID_RESPONSE_RECEIVED) {
			rc = -EIO;
			cifs_dbg(FYI, "Bad MID state?\n");
			goto out;
		}

		buf = (char *)midQ[i]->resp_buf;
		resp_iov[i].iov_base = buf;
		resp_iov[i].iov_len = midQ[i]->resp_buf_size +
			ses->server->vals->header_preamble_size;

		if (midQ[i]->large_buf)
			resp_buf_type[i] = CIFS_LARGE_BUFFER;
		else
			resp_buf_type[i] = CIFS_SMALL_BUFFER;

		rc = ses->server->ops->check_receive(midQ[i], ses->server,
						     flags & CIFS_LOG_ERROR);

		/* mark it so buf will not be freed by cifs_delete_mid */
		if ((flags & CIFS_NO_RESP) == 0)
			midQ[i]->resp_buf = NULL;

	}

	/*
	 * Compounding is never used during session establish.
	 */
	if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) {
		struct kvec iov = {
			.iov_base = resp_iov[0].iov_base,
			.iov_len = resp_iov[0].iov_len
		};
		smb311_update_preauth_hash(ses, &iov, 1);
	}

out:
	/*
	 * This will dequeue all mids. After this it is important that the
	 * demultiplex_thread will not process any of these mids any futher.
	 * This is prevented above by using a noop callback that will not
	 * wake this thread except for the very last PDU.
	 */
	for (i = 0; i < num_rqst; i++) {
		if (!cancelled_mid[i])
			cifs_delete_mid(midQ[i]);
	}

	return rc;
}

int
cifs_send_recv(const unsigned int xid, struct cifs_ses *ses,
	       struct smb_rqst *rqst, int *resp_buf_type, const int flags,
	       struct kvec *resp_iov)
{
	return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type,
				  resp_iov);
}

int
SendReceive2(const unsigned int xid, struct cifs_ses *ses,
	     struct kvec *iov, int n_vec, int *resp_buf_type /* ret */,
	     const int flags, struct kvec *resp_iov)
{
	struct smb_rqst rqst;
	struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov;
	int rc;

	if (n_vec + 1 > CIFS_MAX_IOV_SIZE) {
		new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec),
					GFP_KERNEL);
		if (!new_iov) {
			/* otherwise cifs_send_recv below sets resp_buf_type */
			*resp_buf_type = CIFS_NO_BUFFER;
			return -ENOMEM;
		}
	} else
		new_iov = s_iov;

	/* 1st iov is a RFC1001 length followed by the rest of the packet */
	memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec));

	new_iov[0].iov_base = new_iov[1].iov_base;
	new_iov[0].iov_len = 4;
	new_iov[1].iov_base += 4;
	new_iov[1].iov_len -= 4;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = new_iov;
	rqst.rq_nvec = n_vec + 1;

	rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov);
	if (n_vec + 1 > CIFS_MAX_IOV_SIZE)
		kfree(new_iov);
	return rc;
}

int
SendReceive(const unsigned int xid, struct cifs_ses *ses,
	    struct smb_hdr *in_buf, struct smb_hdr *out_buf,
	    int *pbytes_returned, const int timeout)
{
	int rc = 0;
	struct mid_q_entry *midQ;
	unsigned int len = be32_to_cpu(in_buf->smb_buf_length);
	struct kvec iov = { .iov_base = in_buf, .iov_len = len };
	struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 };

	if (ses == NULL) {
		cifs_dbg(VFS, "Null smb session\n");
		return -EIO;
	}
	if (ses->server == NULL) {
		cifs_dbg(VFS, "Null tcp session\n");
		return -EIO;
	}

	if (ses->server->tcpStatus == CifsExiting)
		return -ENOENT;

	/* Ensure that we do not send more than 50 overlapping requests
	   to the same server. We may make this configurable later or
	   use ses->maxReq */

	if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
		cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n",
			 len);
		return -EIO;
	}

	rc = wait_for_free_request(ses->server, timeout, 0);
	if (rc)
		return rc;

	/* make sure that we sign in the same order that we send on this socket
	   and avoid races inside tcp sendmsg code that could cause corruption
	   of smb data */

	mutex_lock(&ses->server->srv_mutex);

	rc = allocate_mid(ses, in_buf, &midQ);
	if (rc) {
		mutex_unlock(&ses->server->srv_mutex);
		/* Update # of requests on wire to server */
		add_credits(ses->server, 1, 0);
		return rc;
	}

	rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
	if (rc) {
		mutex_unlock(&ses->server->srv_mutex);
		goto out;
	}

	midQ->mid_state = MID_REQUEST_SUBMITTED;

	cifs_in_send_inc(ses->server);
	rc = smb_send(ses->server, in_buf, len);
	cifs_in_send_dec(ses->server);
	cifs_save_when_sent(midQ);

	if (rc < 0)
		ses->server->sequence_number -= 2;

	mutex_unlock(&ses->server->srv_mutex);

	if (rc < 0)
		goto out;

	if (timeout == CIFS_ASYNC_OP)
		goto out;

	rc = wait_for_response(ses->server, midQ);
	if (rc != 0) {
		send_cancel(ses->server, &rqst, midQ);
		spin_lock(&GlobalMid_Lock);
		if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
			/* no longer considered to be "in-flight" */
			midQ->callback = DeleteMidQEntry;
			spin_unlock(&GlobalMid_Lock);
			add_credits(ses->server, 1, 0);
			return rc;
		}
		spin_unlock(&GlobalMid_Lock);
	}

	rc = cifs_sync_mid_result(midQ, ses->server);
	if (rc != 0) {
		add_credits(ses->server, 1, 0);
		return rc;
	}

	if (!midQ->resp_buf || !out_buf ||
	    midQ->mid_state != MID_RESPONSE_RECEIVED) {
		rc = -EIO;
		cifs_dbg(VFS, "Bad MID state?\n");
		goto out;
	}

	*pbytes_returned = get_rfc1002_length(midQ->resp_buf);
	memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4);
	rc = cifs_check_receive(midQ, ses->server, 0);
out:
	cifs_delete_mid(midQ);
	add_credits(ses->server, 1, 0);

	return rc;
}

/* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
   blocking lock to return. */

static int
send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon,
			struct smb_hdr *in_buf,
			struct smb_hdr *out_buf)
{
	int bytes_returned;
	struct cifs_ses *ses = tcon->ses;
	LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;

	/* We just modify the current in_buf to change
	   the type of lock from LOCKING_ANDX_SHARED_LOCK
	   or LOCKING_ANDX_EXCLUSIVE_LOCK to
	   LOCKING_ANDX_CANCEL_LOCK. */

	pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
	pSMB->Timeout = 0;
	pSMB->hdr.Mid = get_next_mid(ses->server);

	return SendReceive(xid, ses, in_buf, out_buf,
			&bytes_returned, 0);
}
コード例 #2
0
ファイル: transport.c プロジェクト: Lyude/linux
int
compound_send_recv(const unsigned int xid, struct cifs_ses *ses,
		   const int flags, const int num_rqst, struct smb_rqst *rqst,
		   int *resp_buf_type, struct kvec *resp_iov)
{
	int i, j, rc = 0;
	int timeout, optype;
	struct mid_q_entry *midQ[MAX_COMPOUND];
	unsigned int credits = 1;
	char *buf;

	timeout = flags & CIFS_TIMEOUT_MASK;
	optype = flags & CIFS_OP_MASK;

	for (i = 0; i < num_rqst; i++)
		resp_buf_type[i] = CIFS_NO_BUFFER;  /* no response buf yet */

	if ((ses == NULL) || (ses->server == NULL)) {
		cifs_dbg(VFS, "Null session\n");
		return -EIO;
	}

	if (ses->server->tcpStatus == CifsExiting)
		return -ENOENT;

	/*
	 * Ensure that we do not send more than 50 overlapping requests
	 * to the same server. We may make this configurable later or
	 * use ses->maxReq.
	 */
	rc = wait_for_free_request(ses->server, timeout, optype);
	if (rc)
		return rc;

	/*
	 * Make sure that we sign in the same order that we send on this socket
	 * and avoid races inside tcp sendmsg code that could cause corruption
	 * of smb data.
	 */

	mutex_lock(&ses->server->srv_mutex);

	for (i = 0; i < num_rqst; i++) {
		midQ[i] = ses->server->ops->setup_request(ses, &rqst[i]);
		if (IS_ERR(midQ[i])) {
			for (j = 0; j < i; j++)
				cifs_delete_mid(midQ[j]);
			mutex_unlock(&ses->server->srv_mutex);
			/* Update # of requests on wire to server */
			add_credits(ses->server, 1, optype);
			return PTR_ERR(midQ[i]);
		}

		midQ[i]->mid_state = MID_REQUEST_SUBMITTED;
		/*
		 * We don't invoke the callback compounds unless it is the last
		 * request.
		 */
		if (i < num_rqst - 1)
			midQ[i]->callback = cifs_noop_callback;
	}
	cifs_in_send_inc(ses->server);
	rc = smb_send_rqst(ses->server, num_rqst, rqst, flags);
	cifs_in_send_dec(ses->server);

	for (i = 0; i < num_rqst; i++)
		cifs_save_when_sent(midQ[i]);

	if (rc < 0)
		ses->server->sequence_number -= 2;

	mutex_unlock(&ses->server->srv_mutex);

	for (i = 0; i < num_rqst; i++) {
		if (rc < 0)
			goto out;

		if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP))
			smb311_update_preauth_hash(ses, rqst[i].rq_iov,
						   rqst[i].rq_nvec);

		if (timeout == CIFS_ASYNC_OP)
			goto out;

		rc = wait_for_response(ses->server, midQ[i]);
		if (rc != 0) {
			cifs_dbg(FYI, "Cancelling wait for mid %llu\n",
				 midQ[i]->mid);
			send_cancel(ses->server, &rqst[i], midQ[i]);
			spin_lock(&GlobalMid_Lock);
			if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) {
				midQ[i]->mid_flags |= MID_WAIT_CANCELLED;
				midQ[i]->callback = DeleteMidQEntry;
				spin_unlock(&GlobalMid_Lock);
				add_credits(ses->server, 1, optype);
				return rc;
			}
			spin_unlock(&GlobalMid_Lock);
		}

		rc = cifs_sync_mid_result(midQ[i], ses->server);
		if (rc != 0) {
			add_credits(ses->server, 1, optype);
			return rc;
		}

		if (!midQ[i]->resp_buf ||
		    midQ[i]->mid_state != MID_RESPONSE_RECEIVED) {
			rc = -EIO;
			cifs_dbg(FYI, "Bad MID state?\n");
			goto out;
		}

		buf = (char *)midQ[i]->resp_buf;
		resp_iov[i].iov_base = buf;
		resp_iov[i].iov_len = midQ[i]->resp_buf_size +
			ses->server->vals->header_preamble_size;

		if (midQ[i]->large_buf)
			resp_buf_type[i] = CIFS_LARGE_BUFFER;
		else
			resp_buf_type[i] = CIFS_SMALL_BUFFER;

		if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) {
			struct kvec iov = {
				.iov_base = resp_iov[i].iov_base,
				.iov_len = resp_iov[i].iov_len
			};
			smb311_update_preauth_hash(ses, &iov, 1);
		}

		credits = ses->server->ops->get_credits(midQ[i]);

		rc = ses->server->ops->check_receive(midQ[i], ses->server,
						     flags & CIFS_LOG_ERROR);

		/* mark it so buf will not be freed by cifs_delete_mid */
		if ((flags & CIFS_NO_RESP) == 0)
			midQ[i]->resp_buf = NULL;
	}
out:
	/*
	 * This will dequeue all mids. After this it is important that the
	 * demultiplex_thread will not process any of these mids any futher.
	 * This is prevented above by using a noop callback that will not
	 * wake this thread except for the very last PDU.
	 */
	for (i = 0; i < num_rqst; i++)
		cifs_delete_mid(midQ[i]);
	add_credits(ses->server, credits, optype);

	return rc;
}

int
cifs_send_recv(const unsigned int xid, struct cifs_ses *ses,
	       struct smb_rqst *rqst, int *resp_buf_type, const int flags,
	       struct kvec *resp_iov)
{
	return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type,
				  resp_iov);
}

int
SendReceive2(const unsigned int xid, struct cifs_ses *ses,
	     struct kvec *iov, int n_vec, int *resp_buf_type /* ret */,
	     const int flags, struct kvec *resp_iov)
{
	struct smb_rqst rqst;
	struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov;
	int rc;

	if (n_vec + 1 > CIFS_MAX_IOV_SIZE) {
		new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec),
					GFP_KERNEL);
		if (!new_iov) {
			/* otherwise cifs_send_recv below sets resp_buf_type */
			*resp_buf_type = CIFS_NO_BUFFER;
			return -ENOMEM;
		}
	} else
		new_iov = s_iov;

	/* 1st iov is a RFC1001 length followed by the rest of the packet */
	memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec));

	new_iov[0].iov_base = new_iov[1].iov_base;
	new_iov[0].iov_len = 4;
	new_iov[1].iov_base += 4;
	new_iov[1].iov_len -= 4;

	memset(&rqst, 0, sizeof(struct smb_rqst));
	rqst.rq_iov = new_iov;
	rqst.rq_nvec = n_vec + 1;

	rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov);
	if (n_vec + 1 > CIFS_MAX_IOV_SIZE)
		kfree(new_iov);
	return rc;
}

int
SendReceive(const unsigned int xid, struct cifs_ses *ses,
	    struct smb_hdr *in_buf, struct smb_hdr *out_buf,
	    int *pbytes_returned, const int timeout)
{
	int rc = 0;
	struct mid_q_entry *midQ;
	unsigned int len = be32_to_cpu(in_buf->smb_buf_length);
	struct kvec iov = { .iov_base = in_buf, .iov_len = len };
	struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 };

	if (ses == NULL) {
		cifs_dbg(VFS, "Null smb session\n");
		return -EIO;
	}
	if (ses->server == NULL) {
		cifs_dbg(VFS, "Null tcp session\n");
		return -EIO;
	}

	if (ses->server->tcpStatus == CifsExiting)
		return -ENOENT;

	/* Ensure that we do not send more than 50 overlapping requests
	   to the same server. We may make this configurable later or
	   use ses->maxReq */

	if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
		cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n",
			 len);
		return -EIO;
	}

	rc = wait_for_free_request(ses->server, timeout, 0);
	if (rc)
		return rc;

	/* make sure that we sign in the same order that we send on this socket
	   and avoid races inside tcp sendmsg code that could cause corruption
	   of smb data */

	mutex_lock(&ses->server->srv_mutex);

	rc = allocate_mid(ses, in_buf, &midQ);
	if (rc) {
		mutex_unlock(&ses->server->srv_mutex);
		/* Update # of requests on wire to server */
		add_credits(ses->server, 1, 0);
		return rc;
	}

	rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
	if (rc) {
		mutex_unlock(&ses->server->srv_mutex);
		goto out;
	}

	midQ->mid_state = MID_REQUEST_SUBMITTED;

	cifs_in_send_inc(ses->server);
	rc = smb_send(ses->server, in_buf, len);
	cifs_in_send_dec(ses->server);
	cifs_save_when_sent(midQ);

	if (rc < 0)
		ses->server->sequence_number -= 2;

	mutex_unlock(&ses->server->srv_mutex);

	if (rc < 0)
		goto out;

	if (timeout == CIFS_ASYNC_OP)
		goto out;

	rc = wait_for_response(ses->server, midQ);
	if (rc != 0) {
		send_cancel(ses->server, &rqst, midQ);
		spin_lock(&GlobalMid_Lock);
		if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
			/* no longer considered to be "in-flight" */
			midQ->callback = DeleteMidQEntry;
			spin_unlock(&GlobalMid_Lock);
			add_credits(ses->server, 1, 0);
			return rc;
		}
		spin_unlock(&GlobalMid_Lock);
	}

	rc = cifs_sync_mid_result(midQ, ses->server);
	if (rc != 0) {
		add_credits(ses->server, 1, 0);
		return rc;
	}

	if (!midQ->resp_buf || !out_buf ||
	    midQ->mid_state != MID_RESPONSE_RECEIVED) {
		rc = -EIO;
		cifs_dbg(VFS, "Bad MID state?\n");
		goto out;
	}

	*pbytes_returned = get_rfc1002_length(midQ->resp_buf);
	memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4);
	rc = cifs_check_receive(midQ, ses->server, 0);
out:
	cifs_delete_mid(midQ);
	add_credits(ses->server, 1, 0);

	return rc;
}

/* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
   blocking lock to return. */

static int
send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon,
			struct smb_hdr *in_buf,
			struct smb_hdr *out_buf)
{
	int bytes_returned;
	struct cifs_ses *ses = tcon->ses;
	LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;

	/* We just modify the current in_buf to change
	   the type of lock from LOCKING_ANDX_SHARED_LOCK
	   or LOCKING_ANDX_EXCLUSIVE_LOCK to
	   LOCKING_ANDX_CANCEL_LOCK. */

	pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
	pSMB->Timeout = 0;
	pSMB->hdr.Mid = get_next_mid(ses->server);

	return SendReceive(xid, ses, in_buf, out_buf,
			&bytes_returned, 0);
}