Since gfs2 writes the rindex file a block at a time, and releases the exclusive
lock after each block, it is possible that another process will grab the lock
in the middle of the write. Since rindex entries are not an even divisor of
blocks, that other process may see partial entries. On grows, this is fine.
The process can simply ignore the the partial entires. Previously, the code
withdrew when it saw partial entries. Now is simply prints an info message
letting the user know that it found a partial entry.