patch-2.3.14 linux/net/khttpd/datasending.c

• Lines: 195
• Date: Wed Aug 18 09:49:42 1999
• Orig file: v2.3.13/linux/net/khttpd/datasending.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.13/linux/net/khttpd/datasending.c linux/net/khttpd/datasending.c
@@ -0,0 +1,194 @@
+/*
+
+kHTTPd -- the next generation
+
+Send actual file-data to the connections
+
+*/
+/****************************************************************
+ *	This program is free software; you can redistribute it and/or modify
+ *	it under the terms of the GNU General Public License as published by
+ *	the Free Software Foundation; either version 2, or (at your option)
+ *	any later version.
+ *
+ *	This program 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 General Public License for more details.
+ *
+ *	You should have received a copy of the GNU General Public License
+ *	along with this program; if not, write to the Free Software
+ *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ ****************************************************************/
+
+/*
+
+Purpose:
+
+DataSending does the actual sending of file-data to the socket.
+
+Note: Since asynchronous reads do not -yet- exists, this might block!
+
+Return value:
+	The number of requests that changed status (ie: made some progress)
+*/
+
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+
+#include <net/tcp.h>
+
+#include <asm/uaccess.h>
+#include <linux/smp_lock.h>
+
+#include "structure.h"
+#include "prototypes.h"
+
+static	char	*Block[CONFIG_KHTTPD_NUMCPU];
+
+
+int DataSending(const int CPUNR)
+{
+	struct http_request *CurrentRequest,**Prev;
+	int count = 0;
+	
+	EnterFunction("DataSending");
+	
+	Prev = &(threadinfo[CPUNR].DataSendingQueue);
+	CurrentRequest = threadinfo[CPUNR].DataSendingQueue;
+	while (CurrentRequest!=NULL)
+	{
+		int ReadSize,Space;
+		int retval;
+		mm_segment_t oldfs;
+
+
+		/* First, test if the socket has any buffer-space left.
+		   If not, no need to actually try to send something.  */
+		  
+		
+		Space=4096;
+		if (CurrentRequest->sock->sk!=NULL)
+		{
+			lock_sock(CurrentRequest->sock->sk);
+			Space = sock_wspace(CurrentRequest->sock->sk);
+			release_sock(CurrentRequest->sock->sk);
+		}
+		
+		ReadSize = min(4096,CurrentRequest->FileLength - CurrentRequest->BytesSent);
+		ReadSize = min(ReadSize , Space );
+		
+		if (ReadSize>0)
+		{
+			/* This part does a redundant data-copy. To bad for now. 
+			   In the future, we might want to nick the data right out
+			   of the page-cache
+			*/
+		
+			CurrentRequest->filp->f_pos = CurrentRequest->BytesSent;
+		
+			oldfs = get_fs(); set_fs(KERNEL_DS);
+			retval = CurrentRequest->filp->f_op->read(CurrentRequest->filp, Block[CPUNR], ReadSize, &CurrentRequest->filp->f_pos);
+			set_fs(oldfs);
+		
+			if (retval>0)
+			{
+				retval = SendBuffer_async(CurrentRequest->sock,Block[CPUNR],(size_t)retval);
+				if (retval>0)
+				{
+					CurrentRequest->BytesSent += retval;
+					count++;
+				
+				}
+			}
+		
+		}
+		lock_sock(CurrentRequest->sock->sk);
+		
+		/* 
+		   If end-of-file or closed connection: Finish this request 
+		   by moving it to the "logging" queue. 
+		*/
+		if ((CurrentRequest->BytesSent>=CurrentRequest->FileLength)||
+		   (CurrentRequest->sock->sk->state !=TCP_ESTABLISHED))
+		{
+			struct http_request *Next;
+			Next = CurrentRequest->Next;
+						
+			if  (CurrentRequest->sock->sk->state ==TCP_ESTABLISHED)
+			{
+			
+				CurrentRequest->sock->sk->nonagle = 0;
+				CurrentRequest->sock->sk->linger = 0;
+				tcp_push_pending_frames(CurrentRequest->sock->sk,&(CurrentRequest->sock->sk->tp_pinfo.af_tcp));
+			}
+			
+			release_sock(CurrentRequest->sock->sk);
+
+
+
+			(*Prev) = CurrentRequest->Next;
+			
+			CurrentRequest->Next = threadinfo[CPUNR].LoggingQueue;
+			threadinfo[CPUNR].LoggingQueue = CurrentRequest;	
+				
+			CurrentRequest = Next;
+			continue;
+		
+		}
+		release_sock(CurrentRequest->sock->sk);
+		
+
+		Prev = &(CurrentRequest->Next);	
+		CurrentRequest = CurrentRequest->Next;
+	}
+	
+	LeaveFunction("DataSending");
+	return count;
+}
+
+int InitDataSending(int ThreadCount)
+{
+	int I,I2;
+	
+	EnterFunction("InitDataSending");
+	I=0;
+	while (I<ThreadCount)
+	{
+		Block[I] = (char*)get_free_page((int)GFP_KERNEL);
+		if (Block[I] == NULL) 
+		{
+			I2=0;
+			while (I2<I-1)
+			{
+				free_page((unsigned long)Block[I2++]);
+			}
+			LeaveFunction("InitDataSending - abort");
+			return -1;
+		}
+		I++;
+	}
+	LeaveFunction("InitDataSending");
+	return 0;		
+}
+
+void StopDataSending(const int CPUNR)
+{
+	struct http_request *CurrentRequest,*Next;
+	
+	EnterFunction("StopDataSending");
+	CurrentRequest = threadinfo[CPUNR].DataSendingQueue;
+
+	while (CurrentRequest!=NULL)
+	{	
+		Next = CurrentRequest->Next;
+		CleanUpRequest(CurrentRequest);
+		CurrentRequest=Next;		
+	}
+	
+	threadinfo[CPUNR].DataSendingQueue = NULL;
+
+	free_page( (unsigned long)Block[CPUNR]);
+	LeaveFunction("StopDataSending");
+}