save pid in mfh.  this is not the best idea because fork() can mean the pid is incorrect but it is better than nothing because fuse is not giving us valid pids via ctx in read()/write()
save pid in mfh.  this is not the best idea because fork() can mean the pid is incorrect but it is better than nothing because fuse is not giving us valid pids via ctx in read()/write()

git-svn-id: ae92b08b608af1c8cefa3e10d2325ea527204e07@22462 3eda493b-6a19-0410-b2e0-ec8ea4dd8fda

pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable