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- fixed memory leaks in the 3 packet receive routines. The problem was
that the ctdb_call logic would occasionally complete and free a
incoming packet, which would then be freed again in the packet
receive routine. The solution is to make the packet a child of a
temporary context in the receive routine then free that temporary
context. That allows other routines to keep or free the packet if
they want to, while allowing us to safely free it (via a free of the
temporary context) in the receive function
(This used to be ctdb commit 304aaaa7235febbe97ff9ecb43875b7265ac48cd)
fetch, to avoid the daemon re-reading it
- suffix the database name with the node name so that testing on
loopback doesn't result in a name collision in the database open
(This used to be ctdb commit ad30a4db75450643ff146c40faa306a021de3dd2)
code. It may be added back later once everything is working nicely,
or simulated using a in-process pipe instead of a unix domain socket
- rewrote the ctdb_fetch_lock() code to follow the new design
(This used to be ctdb commit 5024dd1f305fe1ecc262db2240c56f773b4f28f0)
change ctdb_client_fetch_lock to return a status code instead of a record handle and make it unconditionally fill in data.
change ctdb_client_store_unlock to take ctdb_db and key as arguments instead of a record handle
update the ctdb_fetch.c test to use the clientside helpers for fetching and storing data
(This used to be ctdb commit 22d5d40375e0135916c97945646f94119612615d)
this will be the core of the non-blocking lock idea for ctdb, it will be used
in place of ctdb_ltdb_fetch(), but will also get a lock. It re-starts a request
if it needs to block
(This used to be ctdb commit afa479026cf6293e6a878c8a329cdac035284672)
The problem we have is this:
- we want the client smbd processes to be able to 'shortcut' access
to the ltdb, by directly accessing the ltdb, and if the header of
the record shows we are the dmaster then process immediately, with
no overhead of talking across the unix domain socket
- a client doing a shortcut will use tdb_chainlock() to lock the
record while processing
- we want the main ctdb daemon to be able to set locks on the
record, and when those locks collide with a 'shortcut' fcntl lock,
we want the ctdb daemon to keep processing other operations
- we don't want to have to send a message from a smbd client to the
ctdbd each time it releases a lock
The solution is shown in this example. Note that the expensive fork()
and blocking lock is only paid in case of contention, so in the median
case I think this is zero cost.
(This used to be ctdb commit a3248c3e2b740cd2403acffd3c1f6a33dca0ea03)
note that the store_unlock does not actually do anything yet apart from passing the pdu from client to daemon and daemon responds.
next is to make sure the daemon actually stores the data in a database
(This used to be ctdb commit 167d6993e78f6a1d0f6607ef66925a14993ae6a1)
no locking is yet done and the store_unlock call is still missing
the ./tests/fetch.sh --daemon test fails with parent process dying which needs to be investigated.
(This used to be ctdb commit 7d7141c968950a8856f1be79871932b688bfb07f)
- split client specific routines out of ctdb_daemon.c
- use ctdb_queue code in message send from client to daemon
- use clearer names in client/daemon functions
- use talloc autofree context to avoid global for unlink of socket on
exit
- start on API change for message handler, to allow ctdb messaging to
handle daemon mode with multiple clients
(This used to be ctdb commit 53555db45f3583ae4a32cc3aa9e07fb8ef2a77e3)
we can no longer use this function from the application if we are in daemon mode.
add a horrible "sleep()" to ctdb_test.c to prevent the daemon from dissapearing (parent process died) when the application exits which may happen before the other nodes in the test have finished talking to our daemon
(This used to be ctdb commit 74d35dafe06d71e755f3a58cc58d4b9b56fc821b)
send the correct structure back to a client
assorted other cleanups
(tests/test1.sh now works in daemon mode)
(This used to be ctdb commit f4593754cab750dfdb9384884502e2e1b8fde1f0)
added transport level packet allocator, allowing the transport to
enforce alignment or special memory rules
(This used to be ctdb commit 50304a5c4d8d640732678eeed793857334ca5ec1)
ctdb will now move the dmaster role between nodes after
CTDB_MAX_LACOUNT consecutive accesses by the same node.
(This used to be ctdb commit af87f587d8f70192ecac0125054bf9583a4849a7)
- added --self-connect option to ctdb_test, allowing testing when a
node connects to itself. not as efficient as local bypass, but very
useful for testing purposes (easier to work with 1 task in gdb than
2)
- split the ctdb_call() into an async triple, in the style of Samba4
async functions. So we now have ctdb_call_send(), ctdb_call_recv()
and ctdb_call().
- added the main ctdb_call protocol logic. No error checking yet, but
seems to work for simple cases
- ensure we initialise the length argument to getsockopt()
(This used to be ctdb commit 95fad717ef5ab93be3603aa11d2878876fe868d3)
- split up ctdb layer code into 3 modules
- added a simple test suite
- added packet structures for ctdb_call
- switched to an array for ctdb_node to make vnn lookup easy and fast
(This used to be ctdb commit 8a17460a816a5970f2df8244a06aec55d814f186)
- added basic IO handling for the tcp backend
- added a ctdb_node_dead upcall
- added packet queueing
- adding incoming packet handling
(This used to be ctdb commit 415497c952630e746e8cdcf8e1e2a7b2ac3e51fb)
