Description of problem:
Hello,
the bash completion doesn't complete for the /dev/mapper device file names for the lv commands. For example when you type
lvdisplay /dev/mapper/[Tab][Tab]
It won't show you the existing lv devices in the path.

It works only when you type:
lvdisplay [Tab][Tab]
it will offer you devices in /dev/[volumegroups/*

Version-Release number of selected component (if applicable):
bash-completion-2.0-1.fc17.noarch

How reproducible:
100%

Steps to Reproduce:
1.type
lvdisplay /dev/mapper/[Tab][Tab]

2.or type
lvchange /d[Tab][Tab]

3. or type
lvresize /dev/[Tab][Tab]
  
4. or type
lvextend /dev/v[Tab][Tab]

and possibly some other lv commands as well.

Actual results:
Device name is not completed as expected.

Expected results:
Expected result is that it would show relevant devices or at least all files in given path.