What: /sys/fs/ocfs2/ Date: April 2008 Contact: ocfs2-devel@oss.oracle.com Description: The /sys/fs/ocfs2 directory contains knobs used by the ocfs2-tools to interact with the filesystem. What: /sys/fs/ocfs2/max_locking_protocol Date: April 2008 Contact: ocfs2-devel@oss.oracle.com Description: The /sys/fs/ocfs2/max_locking_protocol file displays version of ocfs2 locking supported by the filesystem. This version covers how ocfs2 uses distributed locking between cluster nodes. The protocol version has a major and minor number. Two cluster nodes can interoperate if they have an identical major number and an overlapping minor number - thus, a node with version 1.10 can interoperate with a node sporting version 1.8, as long as both use the 1.8 protocol. Reading from this file returns a single line, the major number and minor number joined by a period, eg "1.10". This file is read-only. The value is compiled into the driver. What: /sys/fs/ocfs2/loaded_cluster_plugins Date: April 2008 Contact: ocfs2-devel@oss.oracle.com Description: The /sys/fs/ocfs2/loaded_cluster_plugins file describes the available plugins to support ocfs2 cluster operation. A cluster plugin is required to use ocfs2 in a cluster. There are currently two available plugins: * 'o2cb' - The classic o2cb cluster stack that ocfs2 has used since its inception. * 'user' - A plugin supporting userspace cluster software in conjunction with fs/dlm. Reading from this file returns the names of all loaded plugins, one per line. This file is read-only. Its contents may change as plugins are loaded or removed. What: /sys/fs/ocfs2/active_cluster_plugin Date: April 2008 Contact: ocfs2-devel@oss.oracle.com Description: The /sys/fs/ocfs2/active_cluster_plugin displays which cluster plugin is currently in use by the filesystem. The active plugin will appear in the loaded_cluster_plugins file as well. Only one plugin can be used at a time. Reading from this file returns the name of the active plugin on a single line. This file is read-only. Which plugin is active depends on the cluster stack in use. The contents may change when all filesystems are unmounted and the cluster stack is changed. What: /sys/fs/ocfs2/cluster_stack Date: April 2008 Contact: ocfs2-devel@oss.oracle.com Description: The /sys/fs/ocfs2/cluster_stack file contains the name of current ocfs2 cluster stack. This value is set by userspace tools when bringing the cluster stack online. Cluster stack names are 4 characters in length. When the 'o2cb' cluster stack is used, the 'o2cb' cluster plugin is active. All other cluster stacks use the 'user' cluster plugin. Reading from this file returns the name of the current cluster stack on a single line. Writing a new stack name to this file changes the current cluster stack unless there are mounted ocfs2 filesystems. If there are mounted filesystems, attempts to change the stack return an error. Users: ocfs2-tools <ocfs2-tools-devel@oss.oracle.com>