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c5ec04f24e
Implementing persistent trasnaction code from Samba. Persistent transaction code was reimplemented in Samba using g_lock.tdb to hold transaction locks and using TRANS3_COMMIT control. Implementation details: 1. When starting a transaction, create a record with "transaction-<dbid>" as key and store current server_id in the structure. 2. If a record already exists, some other client has already started a transaction. Verify that the process corresponding to server_id stored in the record really exists or it's a stale record and overwrite it. 3. All modifications to the actual persistent database are stored in a marshal buffer. 4. When transaction is committed, read the sequence number of the persistent database and increment it. Sequence number record is also stored in the marshal buffer. 5. Send the changed records (marshal buffer) in TRANS3_COMMIT control to all the active nodes. 6. If all controls succeed, verify that the sequence number has been incremented. Commit is successful. If any of the controls fail, abort the transaction. 7. In case sequence number has not yet been incremented, then database recovery has been triggered. So repeat from step 5. Signed-off-by: Amitay Isaacs <amitay@gmail.com> (This used to be ctdb commit 4e0f1971792c9431d8d51dc57d54ecc9e4576dd5)