1 files changed, 434 insertions, 0 deletions

diff --git a/release/src/linux/linux/fs/cifs/transport.c b/release/src/linux/linux/fs/cifs/transport.c
new file mode 100644
index 00000000..4092aea7
--- /dev/null
+++ b/release/src/linux/linux/fs/cifs/transport.c
@@ -0,0 +1,434 @@
+/*
+ *   fs/cifs/transport.c
+ *
+ *   Copyright (C) International Business Machines  Corp., 2002,2004
+ *   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/list.h>
+#include <linux/wait.h>
+#include <linux/net.h>
+#include <linux/version.h>
+#include <asm/uaccess.h>
+#include <asm/processor.h>
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+
+extern kmem_cache_t *cifs_mid_cachep;
+extern kmem_cache_t *cifs_oplock_cachep;
+
+struct mid_q_entry *
+AllocMidQEntry(struct smb_hdr *smb_buffer, struct cifsSesInfo *ses)
+{
+	struct mid_q_entry *temp;
+
+	if (ses == NULL) {
+		cERROR(1, ("Null session passed in to AllocMidQEntry "));
+		return NULL;
+	}
+	if (ses->server == NULL) {
+		cERROR(1, ("Null TCP session in AllocMidQEntry"));
+		return NULL;
+	}
+	
+	temp = (struct mid_q_entry *) kmem_cache_alloc(cifs_mid_cachep,
+						       SLAB_KERNEL);
+	if (temp == NULL)
+		return temp;
+	else {
+		memset(temp, 0, sizeof (struct mid_q_entry));
+		temp->mid = smb_buffer->Mid;	/* always LE */
+		temp->pid = current->pid;
+		temp->command = smb_buffer->Command;
+		cFYI(1, ("For smb_command %d", temp->command));
+		do_gettimeofday(&temp->when_sent);
+		temp->ses = ses;
+		temp->tsk = current;
+	}
+
+	spin_lock(&GlobalMid_Lock);
+	list_add_tail(&temp->qhead, &ses->server->pending_mid_q);
+	atomic_inc(&midCount);
+	temp->midState = MID_REQUEST_ALLOCATED;
+	spin_unlock(&GlobalMid_Lock);
+	return temp;
+}
+
+void
+DeleteMidQEntry(struct mid_q_entry *midEntry)
+{
+	spin_lock(&GlobalMid_Lock);
+	midEntry->midState = MID_FREE;
+	list_del(&midEntry->qhead);
+	atomic_dec(&midCount);
+	spin_unlock(&GlobalMid_Lock);
+	cifs_buf_release(midEntry->resp_buf);
+	kmem_cache_free(cifs_mid_cachep, midEntry);
+}
+
+struct oplock_q_entry *
+AllocOplockQEntry(struct inode * pinode, __u16 fid, struct cifsTconInfo * tcon)
+{
+	struct oplock_q_entry *temp;
+	if ((pinode== NULL) || (tcon == NULL)) {
+		cERROR(1, ("Null parms passed to AllocOplockQEntry"));
+		return NULL;
+	}
+	temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep,
+						       SLAB_KERNEL);
+	if (temp == NULL)
+		return temp;
+	else {
+		temp->pinode = pinode;
+		temp->tcon = tcon;
+		temp->netfid = fid;
+		spin_lock(&GlobalMid_Lock);
+		list_add_tail(&temp->qhead, &GlobalOplock_Q);
+		spin_unlock(&GlobalMid_Lock);
+	}
+	return temp;
+
+}
+
+void DeleteOplockQEntry(struct oplock_q_entry * oplockEntry)
+{
+	spin_lock(&GlobalMid_Lock); 
+    /* should we check if list empty first? */
+	list_del(&oplockEntry->qhead);
+	spin_unlock(&GlobalMid_Lock);
+	kmem_cache_free(cifs_oplock_cachep, oplockEntry);
+}
+
+int
+smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer,
+	 unsigned int smb_buf_length, struct sockaddr *sin)
+{
+	int rc = 0;
+	int i = 0;
+	struct msghdr smb_msg;
+	struct iovec iov;
+	mm_segment_t temp_fs;
+
+	if(ssocket == NULL)
+		return -ENOTSOCK; /* BB eventually add reconnect code here */
+	iov.iov_base = smb_buffer;
+	iov.iov_len = smb_buf_length + 4;
+
+	smb_msg.msg_name = sin;
+	smb_msg.msg_namelen = sizeof (struct sockaddr);
+	smb_msg.msg_iov = &iov;
+	smb_msg.msg_iovlen = 1;
+	smb_msg.msg_control = NULL;
+	smb_msg.msg_controllen = 0;
+	smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/
+
+	/* smb header is converted in header_assemble. bcc and rest of SMB word
+	   area, and byte area if necessary, is converted to littleendian in 
+	   cifssmb.c and RFC1001 len is converted to bigendian in smb_send 
+	   Flags2 is converted in SendReceive */
+
+	smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
+	cFYI(1, ("Sending smb of length %d ", smb_buf_length));
+	dump_smb(smb_buffer, smb_buf_length + 4);
+
+	temp_fs = get_fs();	/* we must turn off socket api parm checking */
+	set_fs(get_ds());
+	while(iov.iov_len > 0) {
+		rc = sock_sendmsg(ssocket, &smb_msg, smb_buf_length + 4);
+		if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
+			i++;
+			if(i > 60) {
+				cERROR(1,
+				   ("sends on sock %p stuck for 30 seconds",
+				    ssocket));
+				rc = -EAGAIN;
+				break;
+			}
+			set_current_state(TASK_INTERRUPTIBLE);
+			schedule_timeout(HZ/2);
+			continue;
+		}
+		if (rc < 0) 
+			break;
+		iov.iov_base += rc;
+		iov.iov_len -= rc;
+	}
+	set_fs(temp_fs);
+
+	if (rc < 0) {
+		cERROR(1,("Error %d sending data on socket to server.", rc));
+	} else {
+		rc = 0;
+	}
+
+	return rc;
+}
+
+int
+SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
+	    struct smb_hdr *in_buf, struct smb_hdr *out_buf,
+	    int *pbytes_returned, const int long_op)
+{
+	int rc = 0;
+	unsigned int receive_len;
+	long timeout;
+	struct mid_q_entry *midQ;
+
+	if (ses == NULL) {
+		cERROR(1,("Null smb session"));
+		return -EIO;
+	}
+	if(ses->server == NULL) {
+		cERROR(1,("Null tcp session"));
+		return -EIO;
+	}
+
+	/* 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(long_op == -1) {
+		/* oplock breaks must not be held up */
+		atomic_inc(&ses->server->inFlight);
+	} else {
+		spin_lock(&GlobalMid_Lock); 
+		while(1) {        
+			if(atomic_read(&ses->server->inFlight) >= CIFS_MAX_REQ){
+				spin_unlock(&GlobalMid_Lock);
+				wait_event(ses->server->request_q,
+					atomic_read(&ses->server->inFlight)
+					 < CIFS_MAX_REQ);
+				spin_lock(&GlobalMid_Lock);
+			} else {
+				if(ses->server->tcpStatus == CifsExiting) {
+					spin_unlock(&GlobalMid_Lock);
+					return -ENOENT;
+				}
+
+			/* can not count locking commands against total since
+			   they are allowed to block on server */
+					
+				if(long_op < 3) {
+				/* update # of requests on the wire to server */
+					atomic_inc(&ses->server->inFlight);
+				}
+				spin_unlock(&GlobalMid_Lock);
+				break;
+			}
+		}
+	}
+	/* 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 */
+
+	down(&ses->server->tcpSem); 
+
+	if (ses->server->tcpStatus == CifsExiting) {
+		rc = -ENOENT;
+		goto out_unlock;
+	} else if (ses->server->tcpStatus == CifsNeedReconnect) {
+		cFYI(1,("tcp session dead - return to caller to retry"));
+		rc = -EAGAIN;
+		goto out_unlock;
+	} else if (ses->status != CifsGood) {
+		/* check if SMB session is bad because we are setting it up */
+		if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && 
+			(in_buf->Command != SMB_COM_NEGOTIATE)) {
+			rc = -EAGAIN;
+			goto out_unlock;
+		} /* else ok - we are setting up session */
+	}
+	midQ = AllocMidQEntry(in_buf, ses);
+	if (midQ == NULL) {
+		up(&ses->server->tcpSem);
+		/* If not lock req, update # of requests on wire to server */
+		if(long_op < 3) {
+			atomic_dec(&ses->server->inFlight); 
+			wake_up(&ses->server->request_q);
+		}
+		return -ENOMEM;
+	}
+
+	if (in_buf->smb_buf_length > CIFS_MAX_MSGSIZE + MAX_CIFS_HDR_SIZE - 4) {
+		up(&ses->server->tcpSem);
+		cERROR(1,
+		       ("Illegal length, greater than maximum frame, %d ",
+			in_buf->smb_buf_length));
+		DeleteMidQEntry(midQ);
+		/* If not lock req, update # of requests on wire to server */
+		if(long_op < 3) {
+			atomic_dec(&ses->server->inFlight); 
+			wake_up(&ses->server->request_q);
+		}
+		return -EIO;
+	}
+
+	if (in_buf->smb_buf_length > 12)
+		in_buf->Flags2 = cpu_to_le16(in_buf->Flags2);
+	
+	rc = cifs_sign_smb(in_buf, ses, &midQ->sequence_number);
+
+	midQ->midState = MID_REQUEST_SUBMITTED;
+	rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
+		      (struct sockaddr *) &(ses->server->addr.sockAddr));
+	if(rc < 0) {
+		DeleteMidQEntry(midQ);
+		up(&ses->server->tcpSem);
+		/* If not lock req, update # of requests on wire to server */
+		if(long_op < 3) {
+			atomic_dec(&ses->server->inFlight); 
+			wake_up(&ses->server->request_q);
+		}
+		return rc;
+	} else
+		up(&ses->server->tcpSem);
+	if (long_op == -1)
+		goto cifs_no_response_exit;
+	else if (long_op == 2) /* writes past end of file can take looooong time */
+		timeout = 300 * HZ;
+	else if (long_op == 1)
+		timeout = 45 * HZ; /* should be greater than 
+			servers oplock break timeout (about 43 seconds) */
+	else if (long_op > 2) {
+		timeout = MAX_SCHEDULE_TIMEOUT;
+	} else
+		timeout = 15 * HZ;
+	/* wait for 15 seconds or until woken up due to response arriving or 
+	   due to last connection to this server being unmounted */
+	if (signal_pending(current)) {
+		/* if signal pending do not hold up user for full smb timeout
+		but we still give response a change to complete */
+		if(midQ->midState & MID_REQUEST_SUBMITTED) {
+			set_current_state(TASK_UNINTERRUPTIBLE);
+			timeout = sleep_on_timeout(&ses->server->response_q,2 * HZ);
+		}
+	} else { /* using normal timeout */
+		/* timeout = wait_event_interruptible_timeout(ses->server->response_q,
+			(midQ->midState & MID_RESPONSE_RECEIVED) || 
+			((ses->server->tcpStatus != CifsGood) &&
+			 (ses->server->tcpStatus != CifsNew)),
+			timeout); */ 
+		/* Can not allow user interrupts- wreaks havoc with performance */
+		if(midQ->midState & MID_REQUEST_SUBMITTED) {
+			set_current_state(TASK_UNINTERRUPTIBLE);
+			timeout = sleep_on_timeout(&ses->server->response_q,timeout);
+		}
+	}
+    
+	spin_lock(&GlobalMid_Lock);
+	if (midQ->resp_buf) {
+		spin_unlock(&GlobalMid_Lock);
+		receive_len = be32_to_cpu(midQ->resp_buf->smb_buf_length);
+	} else {
+		cERROR(1,("No response buffer"));
+		if(midQ->midState == MID_REQUEST_SUBMITTED) {
+			if(ses->server->tcpStatus == CifsExiting)
+				rc = -EHOSTDOWN;
+			else {
+				ses->server->tcpStatus = CifsNeedReconnect;
+				midQ->midState = MID_RETRY_NEEDED;
+			}
+		}
+
+		if (rc != -EHOSTDOWN) {
+			if(midQ->midState == MID_RETRY_NEEDED) {
+				rc = -EAGAIN;
+				cFYI(1,("marking request for retry"));
+			} else {
+				rc = -EIO;
+			}
+		}
+		spin_unlock(&GlobalMid_Lock);
+		DeleteMidQEntry(midQ);
+		/* If not lock req, update # of requests on wire to server */
+		if(long_op < 3) {
+			atomic_dec(&ses->server->inFlight); 
+			wake_up(&ses->server->request_q);
+		}
+		return rc;
+	}
+  
+	if (receive_len > CIFS_MAX_MSGSIZE + MAX_CIFS_HDR_SIZE) {
+		cERROR(1,
+		       ("Frame too large received.  Length: %d  Xid: %d",
+			receive_len, xid));
+		rc = -EIO;
+	} else {		/* rcvd frame is ok */
+
+		if (midQ->resp_buf && out_buf
+		    && (midQ->midState == MID_RESPONSE_RECEIVED)) {
+			memcpy(out_buf, midQ->resp_buf,
+			       receive_len +
+			       4 /* include 4 byte RFC1001 header */ );
+
+			dump_smb(out_buf, 92);
+			/* convert the length into a more usable form */
+			out_buf->smb_buf_length =
+			    be32_to_cpu(out_buf->smb_buf_length);
+			if((out_buf->smb_buf_length > 24) &&
+			   (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))) {
+				rc = cifs_verify_signature(out_buf, ses->mac_signing_key,midQ->sequence_number); /* BB fix BB */
+				if(rc)
+					cFYI(1,("Unexpected signature received from server"));
+			}
+
+			if (out_buf->smb_buf_length > 12)
+				out_buf->Flags2 = le16_to_cpu(out_buf->Flags2);
+			if (out_buf->smb_buf_length > 28)
+				out_buf->Pid = le16_to_cpu(out_buf->Pid);
+			if (out_buf->smb_buf_length > 28)
+				out_buf->PidHigh =
+				    le16_to_cpu(out_buf->PidHigh);
+
+			*pbytes_returned = out_buf->smb_buf_length;
+
+			/* BB special case reconnect tid and reconnect uid here? */
+			rc = map_smb_to_linux_error(out_buf);
+
+			/* convert ByteCount if necessary */
+			if (receive_len >=
+			    sizeof (struct smb_hdr) -
+			    4 /* do not count RFC1001 header */  +
+			    (2 * out_buf->WordCount) + 2 /* bcc */ )
+				BCC(out_buf) = le16_to_cpu(BCC(out_buf));
+		} else {
+			rc = -EIO;
+			cFYI(1,("Bad MID state? "));
+		}
+	}
+cifs_no_response_exit:
+	DeleteMidQEntry(midQ);
+
+	if(long_op < 3) {
+		atomic_dec(&ses->server->inFlight); 
+		wake_up(&ses->server->request_q);
+	}
+
+	return rc;
+
+out_unlock:
+	up(&ses->server->tcpSem);
+	/* If not lock req, update # of requests on wire to server */
+	if(long_op < 3) {
+		atomic_dec(&ses->server->inFlight); 
+		wake_up(&ses->server->request_q);
+	}
+
+	return rc;
+}