--- postfix-2.7.1/src/util/fsspace.c	2006-06-15 20:07:16.000000000 +0200
+++ postfix-2.7.1.patched/src/util/fsspace.c	2010-06-28 16:31:06.515244528 +0200
@@ -57,6 +57,7 @@
 #error "please specify the include file with `struct statvfs'"
 #endif
 #endif
+#include <errno.h>
 
 /* Utility library. */
 
@@ -65,6 +66,8 @@
 
 /* fsspace - find amount of available file system space */
 
+static void fs64space(const char *, struct fsspace * );
+
 void    fsspace(const char *path, struct fsspace * sp)
 {
     const char *myname = "fsspace";
@@ -90,7 +93,15 @@
     struct statvfs fsbuf;
 
     if (statvfs(path, &fsbuf) < 0)
+     {
+    	if (errno == EOVERFLOW)  
+	{
+	  	fs64space(path, sp);
+		return;
+	}
+    	else
 	msg_fatal("statvfs %s: %m", path);
+	}
     sp->block_size = fsbuf.f_frsize;
     sp->block_free = fsbuf.f_bavail;
 #endif
@@ -99,6 +110,23 @@
 		 myname, path, sp->block_size, sp->block_free);
 }
 
+static void 
+fs64space(const char *path, struct fsspace * sp)
+{
+    const char *myname = "fs64space";
+    struct statvfs64 fs64buf;
+    if (statvfs64(path, &fs64buf) < 0)
+	msg_fatal("statvfs64 %s: %m", path);
+    sp->block_size = 512; /* blocksize is variable on ZFS */
+    if(fs64buf.f_bavail > (ULONG_MAX >> 1))
+    	sp->block_free = (ULONG_MAX >> 1);
+    else 
+  	sp->block_free = (unsigned long) fs64buf.f_bavail;
+    if (msg_verbose) 
+	msg_info("%s: %s: block size %lu, blocks free %lu",
+		 myname, path, sp->block_size, sp->block_free);
+}
+
 #ifdef TEST
 
  /*