GFS2: bz 222302: gfs2 knows of directories which it chooses not to display

This is for bugzilla bug bz #222302:

Moving a virtual IP from node to node between two NFS-over-GFS2 servers was causing one of the GFS2 servers to become confused and reference a deleted inode. The problem was due to vfs dentries that did not reference the gfs2_dops and therefore didn't call the gfs2 revalidate code to revalidate a dentry after a directory had been deleted & recreated. This patch is a crosswrite from a RHEL4 bug found in GFS1 as
bz #190756 and it is against the latest -nmw git tree.

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Hi,

This is now in the -nmw git tree. Thanks,

Steve.