Linux: Use filehandles for all 2.6 kernels
This generalizes the use of the exportfs API and file handles
to open disk cache files for all 2.6 kernels.
Code outside of src/afs/LINUX (ex: afsd) can assume that file
handles are used for all 2.6 kernels and can use AFS_LINUX26_ENV
to check.
Within src/afs/LINUX/osi_file.c, NEW_EXPORT_OPS can be used to
determine if the old exportfs API (pre 2.6.24) or the new one
applies.
All traces of the LINUX_USE_FH define are removed.
FIXES 127530
Change-Id: I6803101c56981f9f674cef581f7299656723fdf3
Reviewed-on: http://gerrit.openafs.org/2260
Tested-by: Marc Dionne <marc.c.dionne@gmail.com>
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Derrick Brashear <shadow@dementia.org>