Re: Kernel 2.6.14.2 - Hard link count is wrong

[Daniel Drake <dsd@gentoo.org>]

Clemens Koller wrote:
> I get
>
> .....
> find: WARNING: Hard link count is wrong for .: this may be a bug in your 
> filesystem driver.  Automatically turning on find's -noleaf option.  
> Earlier results may have failed to include directories that should have 
> been searched.
>
> According to google, this might be a kernel bug due to some problems in 
> /proc, see:
> https://www.redhat.com/archives/fedora-list/2005-September/msg02474.html
> Well, how to debug that problem?

That find check is somewhat incorrect (hard link count can be legally modified 
after the search was started and before it finished), but I did fix up the 
/proc problems that existed a while back.

This patch will give you a more useful error from findutils.

Daniel

findutils-4.2.20 made me aware of the incorrect hardlink counts in /proc and
I've been fixing them up.

Although find made me aware of the issue, the message it prints could be more
useful: it doesn't show an accurate location of where the incorrect count
exists (instead, it seems to use the path that you gave to find on the command
line), and it would be nice if it could also report the hardlink count which
it read (on pseudo-filesystems like /proc this isn't very static). 

--- findutils-4.2.20/find/find.c.orig	2005-03-03 22:30:10.000000000 +0000
+++ findutils-4.2.20/find/find.c	2005-04-03 13:45:06.000000000 +0100
@@ -1811,8 +1811,8 @@ process_dir (char *pathname, char *name,
 		   * doesn't really handle hard links with Unix semantics.
 		   * In the latter case, -noleaf should be used routinely.
 		   */
-		  error(0, 0, _("WARNING: Hard link count is wrong for %s: this may be a bug in your filesystem driver.  Automatically turning on find's -noleaf option.  Earlier results may have failed to include directories that should have been searched."),
-			parent);
+		  error(0, 0, _("WARNING: Hard link count (%d) is wrong for %s: this may be a bug in your filesystem driver.  Automatically turning on find's -noleaf option.  Earlier results may have failed to include directories that should have been searched."),
+			statp->st_nlink, pathname);
 		  state.exit_status = 1; /* We know the result is wrong, now */
 		  options.no_leaf_check = true;	/* Don't make same
 						   mistake again */