Description of problem:

The fix for this problem:

    https://bugzilla.redhat.com/show_bug.cgi?id=497830

introduced a new problem: it's now not possible for a non-root user to use df on a device mapper object.

Version-Release number of selected component (if applicable):

df (GNU coreutils) 5.97

How reproducible:

Always.

Steps to Reproduce:
1. On a RHEL 5.4 box with this version of coreutils installed and at least one
   fs managed by the device mapper, execute:

   df -k /dev/mapper/your-dm-object-here

  
Actual results:

$df -k /dev/mapper/localvg1-home
df: `/dev/mapper/localvg1-home': Permission denied


Expected results:

Here's what happens on a RHEL 4.8 box with the older coreutils:

$df -k /dev/mapper/localvg1-home
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/localvg1-home
                       1015496    391291    582262  41% /home


Additional info: