Description: Give up scanning partitions after ten consecutive open failures
 Scanning all the way up to 10000 is excessive and can cause serious
 performance problems in some configurations.
Author: Colin Watson <cjwatson@ubuntu.com>
Bug-Ubuntu: https://bugs.launchpad.net/bugs/787461
Forwarded: yes
Applied-Upstream: http://bazaar.launchpad.net/~vcs-imports/grub/grub2-bzr/revision/3320
Last-Update: 2011-05-27

Index: b/grub-core/kern/emu/hostdisk.c
===================================================================
--- a/grub-core/kern/emu/hostdisk.c
+++ b/grub-core/kern/emu/hostdisk.c
@@ -564,6 +564,7 @@
   int i;
   char real_dev[PATH_MAX];
   struct linux_partition_cache *cache;
+  int missing = 0;
 
   strcpy(real_dev, dev);
 
@@ -602,7 +603,13 @@
 
       fd = open (real_dev, O_RDONLY);
       if (fd == -1)
-	continue;
+	{
+	  if (missing++ < 10)
+	    continue;
+	  else
+	    return 0;
+	}
+      missing = 0;
       close (fd);
 
       start = find_partition_start (real_dev);