[PVFS-developers] libpvfs bug

[Porter Don]

In debugging an application that uses pvfs, I noticed that there were a
number of messages in /varlog/messages from the pvfs kernel.  In
investigating further, I found two places where the library assumes that it
should only be used if the file doesn't exist on the underlying filesystem.

This is problematic when there happens to be a file with the given name on
the local disk.  It seems like the semantic should be to always go to pvfs
if you are in a directory mentionen in the pvfstab.

So I ran my application in strace and found two spots where this was
happening.  There may be more in calls I am not using.  Anyway, the first is
that pvfs_detect doesn't check against the pvfstab during canonicalize.  The
second is in pvfs_lstat.  It lstat's first, then checks if you wish to use
pvfs.

Attached is a patch against cvs that should correct this behaviour.

Let me know if I have missed something.

Don

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