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since these two controls (UPDATE_RECORD and PERSISTENT_STORE) can respond
asynchronously to the control, we can not allocate the state variable as a child off ctdb_req_control instead we must allocate state as a child off ctdb itself
and steal ctdb_req_control so it becomes a child of state.
othervise both ctdb_req_control and also state will be released immediately after we have finished setting up the async reply and returned.
(This used to be ctdb commit 6f6de0becd179be9eb9a6bf70562b090205ce196)
With these patches, ctdbd will enforce and (by default) always use
tdb_transactions when updating/writing records to a persistent database.
This might come with a small performance degratation since transactions
are slower than no transactions at all.
If a client, such as samba wants to use a persistent database but does NOT
want to pay the performance penalty, it can specify TDB_NOSYNC as the
srvid parameter in the ctdb_control() for CTDB_CONTROL_DB_ATTACH_PERSISTENT.
In this case CTDBD will remember that "this database is not that important"
so I can use unsafe (no transaction) tdb_stores to write the updates.
It will be faster than the default (always use transaction) but less crash safe.
(This used to be ctdb commit 3d85d2cf669686f89cacdc481eaa97aef1ba62c0)
for stores into persistent databases, ALWAYS use a lockwait child take out the lock for the record and never the daemon itself.
(This used to be ctdb commit 7fb6cf549de1b5e9ac5a3e4483c7591850ea2464)
c to prevent it from being immediately freed (and our persistent store
state with it) if we need to wait asynchronously for other nodes before
we can reply back to the client
(This used to be ctdb commit fa5915280933e4d2e7d4d07199829c9c2b87a335)
