[Bugs] [Bug 1301332] New: improve sparse file handling by supporting SEEK_HOLE / SEEK_DATA

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1301332

            Bug ID: 1301332
           Summary: improve sparse file handling by supporting SEEK_HOLE /
                    SEEK_DATA
           Product: nfs-ganesha
         Component: GlusterFS FSAL
          Keywords: FutureFeature
          Assignee: bugs at gluster.org
          Reporter: ndevos at redhat.com
                CC: jthottan at redhat.com
        Depends On: 1220173



Description of problem:
NFSv4 supports SEEK_HOLE and SEEK_DATA and this can improve the handling of
sparse files (like virtual machine images) a lot. Gluster is going to support
this soon too, see bug 1220173 for more details.

Steps to Reproduce:
1. create a sparse file on a NFSv4 mountpoint (use 'qemu-img')
2. copy the sparse file from the NFSv4 mount to somewhere (use 'cp')
3. compare the allocated space of the two files

Actual results:
The copy is fully allocated.

Expected results:
The copy should have holes as well.


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1220173
[Bug 1220173] SEEK_HOLE support (optimization)
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