--- xlog.c.old	Mon Feb 19 12:35:53 2001
+++ xlog.c	Mon Feb 19 13:05:23 2001
@@ -24,6 +24,10 @@
 #include <locale.h>
 #endif
 
+#ifdef	_HAVE_LINUX_SENDFILE
+#include <sys/sendfile.h>
+#endif
+
 #include "access/transam.h"
 #include "access/xact.h"
 #include "catalog/catversion.h"
@@ -962,6 +966,24 @@
 		elog(STOP, "InitCreate(logfile %u seg %u) failed: %m",
 			 logId, logSeg);
 
+#ifdef	_HAVE_LINUX_SENDFILE
+	{
+		static int	zfd = -1;
+		ssize_t	len;
+
+		if (zfd < 0) {
+			zfd = BasicOpenFile("/dev/zero", O_RDONLY, 0);
+			if (zfd < 0)
+				elog(STOP, "Can't open /dev/zero: %m");
+		}
+		len = sendfile(fd, zfd, NULL, XLogSegSize);
+		if (len < 0)
+			/* XXX - header support sendfile, but kernel doesn't?  Fall back */
+			elog(STOP, "sendfile failed: %m");
+		if (len < XLogSegSize)
+			elog(STOP, "short read on sendfile: %m");
+	}
+#else
 	if (lseek(fd, XLogSegSize - 1, SEEK_SET) != (off_t) (XLogSegSize - 1))
 		elog(STOP, "lseek(logfile %u seg %u) failed: %m",
 			 logId, logSeg);
@@ -969,6 +991,7 @@
 	if (write(fd, "", 1) != 1)
 		elog(STOP, "write(logfile %u seg %u) failed: %m",
 			 logId, logSeg);
+#endif
 
 	if (pg_fsync(fd) != 0)
 		elog(STOP, "fsync(logfile %u seg %u) failed: %m",