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-rw-r--r--Documentation/blockdev/drbd/DRBD-8.3-data-packets.svg588
-rw-r--r--Documentation/blockdev/drbd/DRBD-data-packets.svg459
-rw-r--r--Documentation/blockdev/drbd/README.txt16
-rw-r--r--Documentation/blockdev/drbd/conn-states-8.dot18
-rw-r--r--Documentation/blockdev/drbd/disk-states-8.dot16
-rw-r--r--Documentation/blockdev/drbd/drbd-connection-state-overview.dot85
-rw-r--r--Documentation/blockdev/drbd/node-states-8.dot14
7 files changed, 1196 insertions, 0 deletions
diff --git a/Documentation/blockdev/drbd/DRBD-8.3-data-packets.svg b/Documentation/blockdev/drbd/DRBD-8.3-data-packets.svg
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diff --git a/Documentation/blockdev/drbd/DRBD-data-packets.svg b/Documentation/blockdev/drbd/DRBD-data-packets.svg
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@@ -0,0 +1,459 @@
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439 x="1626 1732 1893 2071 2231 2409 2672 2849 2921 3099 3188 3366 3544 3616 3793 3899"
440 y="22331"
441 id="tspan997">rs_complete_io()</tspan>
442 </text>
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444 id="text1011"
445 style="font-size:318px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
446 <tspan
447 x="16027 16133 16294 16472 16649 16827 17005 17077 17255 17432 17504 17682 17788"
448 y="18402"
449 id="tspan1013">rs_begin_io()</tspan>
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452 id="text1027"
453 style="font-size:318px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
454 <tspan
455 x="16115 16221 16382 16560 16720 16898 17161 17338 17410 17588 17677 17855 18033 18105 18282 18388"
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457 id="tspan1029">rs_complete_io()</tspan>
458 </text>
459</svg>
diff --git a/Documentation/blockdev/drbd/README.txt b/Documentation/blockdev/drbd/README.txt
new file mode 100644
index 000000000000..627b0a1bf35e
--- /dev/null
+++ b/Documentation/blockdev/drbd/README.txt
@@ -0,0 +1,16 @@
1Description
2
3 DRBD is a shared-nothing, synchronously replicated block device. It
4 is designed to serve as a building block for high availability
5 clusters and in this context, is a "drop-in" replacement for shared
6 storage. Simplistically, you could see it as a network RAID 1.
7
8 Please visit http://www.drbd.org to find out more.
9
10The here included files are intended to help understand the implementation
11
12DRBD-8.3-data-packets.svg, DRBD-data-packets.svg
13 relates some functions, and write packets.
14
15conn-states-8.dot, disk-states-8.dot, node-states-8.dot
16 The sub graphs of DRBD's state transitions
diff --git a/Documentation/blockdev/drbd/conn-states-8.dot b/Documentation/blockdev/drbd/conn-states-8.dot
new file mode 100644
index 000000000000..025e8cf5e64a
--- /dev/null
+++ b/Documentation/blockdev/drbd/conn-states-8.dot
@@ -0,0 +1,18 @@
1digraph conn_states {
2 StandAllone -> WFConnection [ label = "ioctl_set_net()" ]
3 WFConnection -> Unconnected [ label = "unable to bind()" ]
4 WFConnection -> WFReportParams [ label = "in connect() after accept" ]
5 WFReportParams -> StandAllone [ label = "checks in receive_param()" ]
6 WFReportParams -> Connected [ label = "in receive_param()" ]
7 WFReportParams -> WFBitMapS [ label = "sync_handshake()" ]
8 WFReportParams -> WFBitMapT [ label = "sync_handshake()" ]
9 WFBitMapS -> SyncSource [ label = "receive_bitmap()" ]
10 WFBitMapT -> SyncTarget [ label = "receive_bitmap()" ]
11 SyncSource -> Connected
12 SyncTarget -> Connected
13 SyncSource -> PausedSyncS
14 SyncTarget -> PausedSyncT
15 PausedSyncS -> SyncSource
16 PausedSyncT -> SyncTarget
17 Connected -> WFConnection [ label = "* on network error" ]
18}
diff --git a/Documentation/blockdev/drbd/disk-states-8.dot b/Documentation/blockdev/drbd/disk-states-8.dot
new file mode 100644
index 000000000000..d06cfb46fb98
--- /dev/null
+++ b/Documentation/blockdev/drbd/disk-states-8.dot
@@ -0,0 +1,16 @@
1digraph disk_states {
2 Diskless -> Inconsistent [ label = "ioctl_set_disk()" ]
3 Diskless -> Consistent [ label = "ioctl_set_disk()" ]
4 Diskless -> Outdated [ label = "ioctl_set_disk()" ]
5 Consistent -> Outdated [ label = "receive_param()" ]
6 Consistent -> UpToDate [ label = "receive_param()" ]
7 Consistent -> Inconsistent [ label = "start resync" ]
8 Outdated -> Inconsistent [ label = "start resync" ]
9 UpToDate -> Inconsistent [ label = "ioctl_replicate" ]
10 Inconsistent -> UpToDate [ label = "resync completed" ]
11 Consistent -> Failed [ label = "io completion error" ]
12 Outdated -> Failed [ label = "io completion error" ]
13 UpToDate -> Failed [ label = "io completion error" ]
14 Inconsistent -> Failed [ label = "io completion error" ]
15 Failed -> Diskless [ label = "sending notify to peer" ]
16}
diff --git a/Documentation/blockdev/drbd/drbd-connection-state-overview.dot b/Documentation/blockdev/drbd/drbd-connection-state-overview.dot
new file mode 100644
index 000000000000..6d9cf0a7b11d
--- /dev/null
+++ b/Documentation/blockdev/drbd/drbd-connection-state-overview.dot
@@ -0,0 +1,85 @@
1// vim: set sw=2 sts=2 :
2digraph {
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}
diff --git a/Documentation/blockdev/drbd/node-states-8.dot b/Documentation/blockdev/drbd/node-states-8.dot
new file mode 100644
index 000000000000..4a2b00c23547
--- /dev/null
+++ b/Documentation/blockdev/drbd/node-states-8.dot
@@ -0,0 +1,14 @@
1digraph node_states {
2 Secondary -> Primary [ label = "ioctl_set_state()" ]
3 Primary -> Secondary [ label = "ioctl_set_state()" ]
4}
5
6digraph peer_states {
7 Secondary -> Primary [ label = "recv state packet" ]
8 Primary -> Secondary [ label = "recv state packet" ]
9 Primary -> Unknown [ label = "connection lost" ]
10 Secondary -> Unknown [ label = "connection lost" ]
11 Unknown -> Primary [ label = "connected" ]
12 Unknown -> Secondary [ label = "connected" ]
13}
14
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-26 11:17:40 -0500