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Implements lock healing for gluster-block fencing use case.
If mandatory lock is enabled:
- Add domain lock/unlock to afr_lk fop.
- Maintain a list of locks to be healed in afr_private_t.
- Add lock to the list if afr_lk(F_SETLK or F_SETLKW) was sucessful.
- Remove it from the list during afr_lk(F_UNLCK).
- On child_down, mark lock as needing heal on that child. If lock is
lost on quorum no. of bricks, remove it from the list and mark fd bad.
- For fds marked as bad, fail the subsequent fd based fops.
- On parent up, traverse the list and heal the locks IFF the client is
the lk owner and has quorum. (shd does not heal any locks).
updates: #613
Change-Id: I03c46ceaea30f5e6236d5ec13f71d843d827f1bc
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
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