3 Contact: ocfs2-devel@oss.oracle.com
5 The /sys/fs/ocfs2 directory contains knobs used by the
6 ocfs2-tools to interact with the filesystem.
8 What: /sys/fs/ocfs2/max_locking_protocol
10 Contact: ocfs2-devel@oss.oracle.com
12 The /sys/fs/ocfs2/max_locking_protocol file displays version
13 of ocfs2 locking supported by the filesystem. This version
14 covers how ocfs2 uses distributed locking between cluster
17 The protocol version has a major and minor number. Two
18 cluster nodes can interoperate if they have an identical
19 major number and an overlapping minor number - thus,
20 a node with version 1.10 can interoperate with a node
21 sporting version 1.8, as long as both use the 1.8 protocol.
23 Reading from this file returns a single line, the major
24 number and minor number joined by a period, eg "1.10".
26 This file is read-only. The value is compiled into the
29 What: /sys/fs/ocfs2/loaded_cluster_plugins
31 Contact: ocfs2-devel@oss.oracle.com
33 The /sys/fs/ocfs2/loaded_cluster_plugins file describes
34 the available plugins to support ocfs2 cluster operation.
35 A cluster plugin is required to use ocfs2 in a cluster.
36 There are currently two available plugins:
38 * 'o2cb' - The classic o2cb cluster stack that ocfs2 has
39 used since its inception.
40 * 'user' - A plugin supporting userspace cluster software
41 in conjunction with fs/dlm.
43 Reading from this file returns the names of all loaded
44 plugins, one per line.
46 This file is read-only. Its contents may change as
47 plugins are loaded or removed.
49 What: /sys/fs/ocfs2/active_cluster_plugin
51 Contact: ocfs2-devel@oss.oracle.com
53 The /sys/fs/ocfs2/active_cluster_plugin displays which
54 cluster plugin is currently in use by the filesystem.
55 The active plugin will appear in the loaded_cluster_plugins
56 file as well. Only one plugin can be used at a time.
58 Reading from this file returns the name of the active plugin
61 This file is read-only. Which plugin is active depends on
62 the cluster stack in use. The contents may change
63 when all filesystems are unmounted and the cluster stack
66 What: /sys/fs/ocfs2/cluster_stack
68 Contact: ocfs2-devel@oss.oracle.com
70 The /sys/fs/ocfs2/cluster_stack file contains the name
71 of current ocfs2 cluster stack. This value is set by
72 userspace tools when bringing the cluster stack online.
74 Cluster stack names are 4 characters in length.
76 When the 'o2cb' cluster stack is used, the 'o2cb' cluster
77 plugin is active. All other cluster stacks use the 'user'
80 Reading from this file returns the name of the current
81 cluster stack on a single line.
83 Writing a new stack name to this file changes the current
84 cluster stack unless there are mounted ocfs2 filesystems.
85 If there are mounted filesystems, attempts to change the
86 stack return an error.
89 ocfs2-tools <ocfs2-tools-devel@oss.oracle.com>