store magic marker at beginning of mmap'd regions
store magic marker at beginning of mmap'd regions

trshaffer/cvmfs,DrDaveD/cvmfs,djw8605/cvmfs,cvmfs/cvmfs,reneme/cvmfs,Gangbiao/cvmfs,trshaffer/cvmfs,cvmfs/cvmfs,Gangbiao/cvmfs,Moliholy/cvmfs,cvmfs-testing/cvmfs,reneme/cvmfs,alhowaidi/cvmfsNDN,alhowaidi/cvmfsNDN,MicBrain/cvmfs,djw8605/cvmfs,alhowaidi/cvmfsNDN,DrDaveD/cvmfs,reneme/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,MicBrain/cvmfs,MicBrain/cvmfs,Moliholy/cvmfs,cvmfs-testing/cvmfs,cvmfs/cvmfs,djw8605/cvmfs,reneme/cvmfs,cvmfs/cvmfs,cvmfs-testing/cvmfs,Gangbiao/cvmfs,Moliholy/cvmfs,cvmfs/cvmfs,trshaffer/cvmfs,DrDaveD/cvmfs,alhowaidi/cvmfsNDN,Gangbiao/cvmfs,Gangbiao/cvmfs,reneme/cvmfs,cvmfs/cvmfs,Moliholy/cvmfs,Moliholy/cvmfs,djw8605/cvmfs,MicBrain/cvmfs,DrDaveD/cvmfs,trshaffer/cvmfs,MicBrain/cvmfs,DrDaveD/cvmfs,cvmfs-testing/cvmfs,DrDaveD/cvmfs,alhowaidi/cvmfsNDN,cvmfs-testing/cvmfs,djw8605/cvmfs,trshaffer/cvmfs