From 45c29d5cdab9936987a18e652b06e8a6db27f85c Mon Sep 17 00:00:00 2001
From: "John W. De Boskey" <jwd@FreeBSD.org>
Date: Tue, 24 Oct 2000 00:08:30 +0000
Subject: [PATCH] The write combining code in revision 1.30 needs a few
 additional touch ups.  The cache needs to be flushed against block reads, and
 a final flush at process termination to force the backup superblocks to disk.

I believe this will allow 'make release' to complete.

Submitted by:	Tor.Egge@fast.no
---
 sbin/newfs/mkfs.c | 37 +++++++++++++++++++++++++------------
 1 file changed, 25 insertions(+), 12 deletions(-)

diff --git a/sbin/newfs/mkfs.c b/sbin/newfs/mkfs.c
index fea37d6e50d6..8e1931e41c3d 100644
--- a/sbin/newfs/mkfs.c
+++ b/sbin/newfs/mkfs.c
@@ -153,6 +153,7 @@ int makedir __P((struct direct *, int));
 void rdfs __P((daddr_t, int, char *));
 void setblock __P((struct fs *, unsigned char *, int));
 void wtfs __P((daddr_t, int, char *));
+void wtfsflush __P((void));
 
 #ifndef STANDALONE
 void get_memleft __P((void));
@@ -719,6 +720,7 @@ mkfs(pp, fsys, fi, fo)
 	for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 		wtfs(fsbtodb(&sblock, cgsblock(&sblock, cylno)),
 		    sbsize, (char *)&sblock);
+	wtfsflush();
 	/*
 	 * Update information about this partion in pack
 	 * label, to that it may be updated on disk.
@@ -1309,6 +1311,7 @@ rdfs(bno, size, bf)
 {
 	int n;
 
+	wtfsflush();
 	if (mfs) {
 		memmove(bf, membase + bno * sectorsize, size);
 		return;
@@ -1329,6 +1332,27 @@ daddr_t wc_sect;		/* units of sectorsize */
 int wc_end;			/* bytes */
 static char wc[WCSIZE];		/* bytes */
 
+/*
+ * Flush dirty write behind buffer.
+ */
+void
+wtfsflush()
+{
+	int n;
+	if (wc_end) {
+		if (lseek(fso, (off_t)wc_sect * sectorsize, SEEK_SET) < 0) {
+			printf("seek error: %ld\n", (long)wc_sect);
+			err(35, "wtfs - writecombine");
+		}
+		n = write(fso, wc, wc_end);
+		if (n != wc_end) {
+			printf("write error: %ld\n", (long)wc_sect);
+			err(36, "wtfs - writecombine");
+		}
+		wc_end = 0;
+	}
+}
+
 /*
  * write a block to the file system
  */
@@ -1364,18 +1388,7 @@ wtfs(bno, size, bf)
 			return;
 		done = 1;
 	}
-	if (wc_end) {
-		if (lseek(fso, (off_t)wc_sect * sectorsize, SEEK_SET) < 0) {
-			printf("seek error: %ld\n", (long)wc_sect);
-			err(35, "wtfs - writecombine");
-		}
-		n = write(fso, wc, wc_end);
-		if (n != wc_end) {
-			printf("write error: %ld\n", (long)wc_sect);
-			err(36, "wtfs - writecombine");
-		}
-		wc_end = 0;
-	}
+	wtfsflush();
 	if (done)
 		return;
 	if (lseek(fso, (off_t)bno * sectorsize, SEEK_SET) < 0) {