[PVFS-developers] libpvfs: rename bug

[Porter Don]

In the pvfs_rename code, there is a check against cross-device links.
However, in certain cases, particularly directories, if the file does not
exist, its fs_ino comes back from pvfs_detect as zero.  This doesn't match
the fs_ino of the original file, so the call fails with an EXDEV.  

The real issue is probably why pvfs_detect is not consitantly filling in the
right values for the fs_ino, but it isn't apparent to me.  Any thoughts?  I
can make renames always work correctly by checking if oldfs_ino and
newfs_ino are zero before comparing them.  See attached patch.

Any thoughts/suggestions on a better way to fix this are quite welcome.
Hope my explanation was clear.

Thanks,
don

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