Missing functionality

[saidsay-so]

pjdfstest covers a ton of control-path functionality, but there's some stuff that it doesn't touch. This is a metabug to track its gaps.

* [ ]  file handle access with fhopen(2) etc.  Used by userspace NFS servers.

* [ ]  POSIX.1e ACLs

* [ ]  NFSv4 ACLs

* [ ]  Advisory locking with flock(2) or fcntl(2)

* [ ]  Extended attributes ([enhancement request: extended attributes #52](https://github.com/pjd/pjdfstest/issues/52))

* [ ]  Any kind of datapath access (lseek, read, write, mmap, copy_file_range, and hole-punching)

* [ ]  Tricky readdir corner cases.  telldir/seekdir, etc.

pjd#60 (comment)

[asomers]

To be clear, this is beyond the scope of GSoC.

[saidsay-so]

Yes, that's why I haven't set a milestone for this issue.