[Bugs] [Bug 1510342] Not all files synced using geo-replication

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1510342



--- Comment #11 from Kotresh HR <khiremat at redhat.com> ---
    Problem:
    The data is not getting synced if master witnessed
    IO as below.

    1. echo "test_data" > f1
    2. ln f1 f2
    3. mv f2 f3
    4. unlink f1

    On master, 'f3' exists with data "test_data" but on
    slave, only f3 exists with zero byte file without
    backend gfid link.

    Cause:
    On master, since 'f2' no longer exists, the hardlink
    is skipped during processing. Later, on trying to sync
    rename, since source ('f2') doesn't exist, dst ('f3')
    is created with same gfid. But in this use case, it
    succeeds but backend gfid would not have linked as 'f1'
    exists with the same gfid. So, rsync would fail with
    ENOENT as backend gfid is not linked with 'f3' and 'f1'
    is unlinked.

    Fix:
    On processing rename, if src doesn't exist on slave,
    don't blindly create dst with same gfid. The gfid
    needs to be checked, if it exists, hardlink needs
    to be created instead of mknod.

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