path: root/Documentation
diff options
authorMark Fasheh <>2008-01-29 17:08:26 -0800
committerMark Fasheh <>2008-04-18 08:56:10 -0700
commit52f7c21b613f80cb425d115c9e5b4ed958a133c0 (patch)
treec153942e3fb645dd5f7435d9d08b0d27a8aed517 /Documentation
parenta839c5afcdc345aecb35b0d3bcd0e09b571329c3 (diff)
ocfs2: Move /sys/o2cb to /sys/fs/o2cb
/sys/fs is where we really want file system specific sysfs objects. Ocfs2-tools has been updated to look in /sys/fs/o2cb. We can maintain backwards compatibility with old ocfs2-tools by using a sysfs symlink. After some time (2 years), the symlink can be safely removed. This patch also adds documentation to make it easier for people to figure out what /sys/fs/o2cb is used for. Signed-off-by: Mark Fasheh <>
Diffstat (limited to 'Documentation')
3 files changed, 31 insertions, 0 deletions
diff --git a/Documentation/ABI/obsolete/o2cb b/Documentation/ABI/obsolete/o2cb
new file mode 100644
index 000000000000..9c49d8e6c0cc
--- /dev/null
+++ b/Documentation/ABI/obsolete/o2cb
@@ -0,0 +1,11 @@
+What: /sys/o2cb symlink
+Date: Dec 2005
+KernelVersion: 2.6.16
+Description: This is a symlink: /sys/o2cb to /sys/fs/o2cb. The symlink will
+ be removed when new versions of ocfs2-tools which know to look
+ in /sys/fs/o2cb are sufficiently prevalent. Don't code new
+ software to look here, it should try /sys/fs/o2cb instead.
+ See Documentation/ABI/stable/o2cb for more information on usage.
+Users: ocfs2-tools. It's sufficient to mail proposed changes to
diff --git a/Documentation/ABI/stable/o2cb b/Documentation/ABI/stable/o2cb
new file mode 100644
index 000000000000..5eb1545e0b8d
--- /dev/null
+++ b/Documentation/ABI/stable/o2cb
@@ -0,0 +1,10 @@
+What: /sys/fs/o2cb/ (was /sys/o2cb)
+Date: Dec 2005
+KernelVersion: 2.6.16
+Description: Ocfs2-tools looks at 'interface-revision' for versioning
+ information. Each logmask/ file controls a set of debug prints
+ and can be written into with the strings "allow", "deny", or
+ "off". Reading the file returns the current state.
+Users: ocfs2-tools. It's sufficient to mail proposed changes to
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index bf0e3df8e7a1..4101f1f2d1eb 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -318,3 +318,13 @@ Why: Not used in-tree. The current out-of-tree users used it to
code / infrastructure should be in the kernel and not in some
out-of-tree driver.
Who: Thomas Gleixner <>
+What: /sys/o2cb symlink
+When: January 2010
+Why: /sys/fs/o2cb is the proper location for this information - /sys/o2cb
+ exists as a symlink for backwards compatibility for old versions of
+ ocfs2-tools. 2 years should be sufficient time to phase in new versions
+ which know to look in /sys/fs/o2cb.