1 What: /sys/fs/ocfs2/ 1 What: /sys/fs/ocfs2/
2 Date: April 2008 2 Date: April 2008
3 Contact: ocfs2-devel@lists.linux.dev 3 Contact: ocfs2-devel@lists.linux.dev
4 Description: 4 Description:
5 The /sys/fs/ocfs2 directory co 5 The /sys/fs/ocfs2 directory contains knobs used by the
6 ocfs2-tools to interact with t 6 ocfs2-tools to interact with the filesystem.
7 7
8 What: /sys/fs/ocfs2/max_locking_prot 8 What: /sys/fs/ocfs2/max_locking_protocol
9 Date: April 2008 9 Date: April 2008
10 Contact: ocfs2-devel@lists.linux.dev 10 Contact: ocfs2-devel@lists.linux.dev
11 Description: 11 Description:
12 The /sys/fs/ocfs2/max_locking_ 12 The /sys/fs/ocfs2/max_locking_protocol file displays version
13 of ocfs2 locking supported by 13 of ocfs2 locking supported by the filesystem. This version
14 covers how ocfs2 uses distribu 14 covers how ocfs2 uses distributed locking between cluster
15 nodes. 15 nodes.
16 16
17 The protocol version has a maj 17 The protocol version has a major and minor number. Two
18 cluster nodes can interoperate 18 cluster nodes can interoperate if they have an identical
19 major number and an overlappin 19 major number and an overlapping minor number - thus,
20 a node with version 1.10 can i 20 a node with version 1.10 can interoperate with a node
21 sporting version 1.8, as long 21 sporting version 1.8, as long as both use the 1.8 protocol.
22 22
23 Reading from this file returns 23 Reading from this file returns a single line, the major
24 number and minor number joined 24 number and minor number joined by a period, eg "1.10".
25 25
26 This file is read-only. The v 26 This file is read-only. The value is compiled into the
27 driver. 27 driver.
28 28
29 What: /sys/fs/ocfs2/loaded_cluster_p 29 What: /sys/fs/ocfs2/loaded_cluster_plugins
30 Date: April 2008 30 Date: April 2008
31 Contact: ocfs2-devel@lists.linux.dev 31 Contact: ocfs2-devel@lists.linux.dev
32 Description: 32 Description:
33 The /sys/fs/ocfs2/loaded_clust 33 The /sys/fs/ocfs2/loaded_cluster_plugins file describes
34 the available plugins to suppo 34 the available plugins to support ocfs2 cluster operation.
35 A cluster plugin is required t 35 A cluster plugin is required to use ocfs2 in a cluster.
36 There are currently two availa 36 There are currently two available plugins:
37 37
38 * 'o2cb' - The classic o2cb cl 38 * 'o2cb' - The classic o2cb cluster stack that ocfs2 has
39 used since its incepti 39 used since its inception.
40 * 'user' - A plugin supporting 40 * 'user' - A plugin supporting userspace cluster software
41 in conjunction with fs 41 in conjunction with fs/dlm.
42 42
43 Reading from this file returns 43 Reading from this file returns the names of all loaded
44 plugins, one per line. 44 plugins, one per line.
45 45
46 This file is read-only. Its c 46 This file is read-only. Its contents may change as
47 plugins are loaded or removed. 47 plugins are loaded or removed.
48 48
49 What: /sys/fs/ocfs2/active_cluster_p 49 What: /sys/fs/ocfs2/active_cluster_plugin
50 Date: April 2008 50 Date: April 2008
51 Contact: ocfs2-devel@lists.linux.dev 51 Contact: ocfs2-devel@lists.linux.dev
52 Description: 52 Description:
53 The /sys/fs/ocfs2/active_clust 53 The /sys/fs/ocfs2/active_cluster_plugin displays which
54 cluster plugin is currently in 54 cluster plugin is currently in use by the filesystem.
55 The active plugin will appear 55 The active plugin will appear in the loaded_cluster_plugins
56 file as well. Only one plugin 56 file as well. Only one plugin can be used at a time.
57 57
58 Reading from this file returns 58 Reading from this file returns the name of the active plugin
59 on a single line. 59 on a single line.
60 60
61 This file is read-only. Which 61 This file is read-only. Which plugin is active depends on
62 the cluster stack in use. The 62 the cluster stack in use. The contents may change
63 when all filesystems are unmou 63 when all filesystems are unmounted and the cluster stack
64 is changed. 64 is changed.
65 65
66 What: /sys/fs/ocfs2/cluster_stack 66 What: /sys/fs/ocfs2/cluster_stack
67 Date: April 2008 67 Date: April 2008
68 Contact: ocfs2-devel@lists.linux.dev 68 Contact: ocfs2-devel@lists.linux.dev
69 Description: 69 Description:
70 The /sys/fs/ocfs2/cluster_stac 70 The /sys/fs/ocfs2/cluster_stack file contains the name
71 of current ocfs2 cluster stack 71 of current ocfs2 cluster stack. This value is set by
72 userspace tools when bringing 72 userspace tools when bringing the cluster stack online.
73 73
74 Cluster stack names are 4 char 74 Cluster stack names are 4 characters in length.
75 75
76 When the 'o2cb' cluster stack 76 When the 'o2cb' cluster stack is used, the 'o2cb' cluster
77 plugin is active. All other c 77 plugin is active. All other cluster stacks use the 'user'
78 cluster plugin. 78 cluster plugin.
79 79
80 Reading from this file returns 80 Reading from this file returns the name of the current
81 cluster stack on a single line 81 cluster stack on a single line.
82 82
83 Writing a new stack name to th 83 Writing a new stack name to this file changes the current
84 cluster stack unless there are 84 cluster stack unless there are mounted ocfs2 filesystems.
85 If there are mounted filesyste 85 If there are mounted filesystems, attempts to change the
86 stack return an error. 86 stack return an error.
87 87
88 Users: 88 Users:
89 ocfs2-tools <ocfs2-tools-devel@lists.li 89 ocfs2-tools <ocfs2-tools-devel@lists.linux.dev>
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