1What: /sys/fs/ocfs2/ 2Date: April 2008 3Contact: ocfs2-devel@oss.oracle.com 4Description: 5 The /sys/fs/ocfs2 directory contains knobs used by the 6 ocfs2-tools to interact with the filesystem. 7 8What: /sys/fs/ocfs2/max_locking_protocol 9Date: April 2008 10Contact: ocfs2-devel@oss.oracle.com 11Description: 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 15 nodes. 16 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. 22 23 Reading from this file returns a single line, the major 24 number and minor number joined by a period, eg "1.10". 25 26 This file is read-only. The value is compiled into the 27 driver. 28 29What: /sys/fs/ocfs2/loaded_cluster_plugins 30Date: April 2008 31Contact: ocfs2-devel@oss.oracle.com 32Description: 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: 37 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. 42 43 Reading from this file returns the names of all loaded 44 plugins, one per line. 45 46 This file is read-only. Its contents may change as 47 plugins are loaded or removed. 48 49What: /sys/fs/ocfs2/active_cluster_plugin 50Date: April 2008 51Contact: ocfs2-devel@oss.oracle.com 52Description: 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. 57 58 Reading from this file returns the name of the active plugin 59 on a single line. 60 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 64 is changed. 65 66What: /sys/fs/ocfs2/cluster_stack 67Date: April 2008 68Contact: ocfs2-devel@oss.oracle.com 69Description: 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. 73 74 Cluster stack names are 4 characters in length. 75 76 When the 'o2cb' cluster stack is used, the 'o2cb' cluster 77 plugin is active. All other cluster stacks use the 'user' 78 cluster plugin. 79 80 Reading from this file returns the name of the current 81 cluster stack on a single line. 82 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. 87 88Users: 89 ocfs2-tools <ocfs2-tools-devel@oss.oracle.com> 90