1 // vim: set sw=2 sts=2 :
2 digraph {
3 rankdir=BT
4 bgcolor=white
5
6 node [shape=plaintext]
7 node [fontcolor=black]
8
9 StandAlone [ style=filled,fillcolor=gray,label=StandAlone ]
10
11 node [fontcolor=lightgray]
12
13 Unconnected [ label=Unconnected ]
14
15 CommTrouble [ shape=record,
16 label="{communication loss|{Timeout|BrokenPipe|NetworkFailure}}" ]
17
18 node [fontcolor=gray]
19
20 subgraph cluster_try_connect {
21 label="try to connect, handshake"
22 rank=max
23 WFConnection [ label=WFConnection ]
24 WFReportParams [ label=WFReportParams ]
25 }
26
27 TearDown [ label=TearDown ]
28
29 Connected [ label=Connected,style=filled,fillcolor=green,fontcolor=black ]
30
31 node [fontcolor=lightblue]
32
33 StartingSyncS [ label=StartingSyncS ]
34 StartingSyncT [ label=StartingSyncT ]
35
36 subgraph cluster_bitmap_exchange {
37 node [fontcolor=red]
38 fontcolor=red
39 label="new application (WRITE?) requests blocked\lwhile bitmap is exchanged"
40
41 WFBitMapT [ label=WFBitMapT ]
42 WFSyncUUID [ label=WFSyncUUID ]
43 WFBitMapS [ label=WFBitMapS ]
44 }
45
46 node [fontcolor=blue]
47
48 cluster_resync [ shape=record,label="{<any>resynchronisation process running\l'concurrent' application requests allowed|{{<T>PausedSyncT\nSyncTarget}|{<S>PausedSyncS\nSyncSource}}}" ]
49
50 node [shape=box,fontcolor=black]
51
52 // drbdadm [label="drbdadm connect"]
53 // handshake [label="drbd_connect()\ndrbd_do_handshake\ndrbd_sync_handshake() etc."]
54 // comm_error [label="communication trouble"]
55
56 //
57 // edges
58 // --------------------------------------
59
60 StandAlone -> Unconnected [ label="drbdadm connect" ]
61 Unconnected -> StandAlone [ label="drbdadm disconnect\lor serious communication trouble" ]
62 Unconnected -> WFConnection [ label="receiver thread is started" ]
63 WFConnection -> WFReportParams [ headlabel="accept()\land/or \lconnect()\l" ]
64
65 WFReportParams -> StandAlone [ label="during handshake\lpeers do not agree\labout something essential" ]
66 WFReportParams -> Connected [ label="data identical\lno sync needed",color=green,fontcolor=green ]
67
68 WFReportParams -> WFBitMapS
69 WFReportParams -> WFBitMapT
70 WFBitMapT -> WFSyncUUID [minlen=0.1,constraint=false]
71
72 WFBitMapS -> cluster_resync:S
73 WFSyncUUID -> cluster_resync:T
74
75 edge [color=green]
76 cluster_resync:any -> Connected [ label="resnyc done",fontcolor=green ]
77
78 edge [color=red]
79 WFReportParams -> CommTrouble
80 Connected -> CommTrouble
81 cluster_resync:any -> CommTrouble
82 edge [color=black]
83 CommTrouble -> Unconnected [label="receiver thread is stopped" ]
84
85 }
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.