Charles Duffy:
> Neither is NFS; both are block devices.
>
> I'll let you know when I'm able to test the new code.
So here is a note for other people.
This patch does,
- hook the inode operations of symlink under /proc.
$ ls -l /proc/<PID>/exe
before: /proc/<PID>/exe --> /branch/ro/usr/bin/emacs
after: /proc/<PID>/exe --> /union/usr/bin/emacs
It will work when the unionfs is mounted as root or not.
- support for nfs branch.
+ stop repeated d_revalidate() which may generate a stale inode.
+ set current->fsuid to superuser temporally in notify_change(). it is
effective when uid is different between nfs server and client.
+ update the inode just after link(2), since nfs doesnt update it and
unionfs misunderstands nfs failed link.
Junjiro Okajima
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