Bug 428291

Description of problem:
GFS2 uses too much memory.  For every buffer, gfs2 has a special
lock structure called a glock, due to the type of page-level locking
it does.  Right now, GFS2 allocates an inode structure to keep track
of the address space associated with metadata.  We need to reduce the
memory requirements.  We can do this by making it only allocate the
address space inode when it's needed, on the fly.  That reduces the
size of each glock considerably.

Version-Release number of selected component (if applicable):
RHEL5.2

How reproducible:
Always

Steps to Reproduce:
1. Run any program that does a lot of writing
  
Actual results:
Lots of memory allocated per page.

Expected results:
Less memory allocated.

Additional info:
There is an upstream patch to do this that needs to be crosswritten
for RHEL5.