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 <mfasheh@suse.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/fs/ocfs2/cluster/sys.c b/fs/ocfs2/cluster/sys.c
index 0c095ce7723d..98429fd68499 100644
--- a/fs/ocfs2/cluster/sys.c
+++ b/fs/ocfs2/cluster/sys.c
@@ -57,6 +57,7 @@ static struct kset *o2cb_kset;
 void o2cb_sys_shutdown(void)
 {
         mlog_sys_shutdown();
+        sysfs_remove_link(NULL, "o2cb");
         kset_unregister(o2cb_kset);
 }
 
@@ -68,6 +69,14 @@ int o2cb_sys_init(void)
         if (!o2cb_kset)
                 return -ENOMEM;
 
+        /*
+         * Create this symlink for backwards compatibility with old
+         * versions of ocfs2-tools which look for things in /sys/o2cb.
+         */
+        ret = sysfs_create_link(NULL, &o2cb_kset->kobj, "o2cb");
+        if (ret)
+                goto error;
+
         ret = sysfs_create_group(&o2cb_kset->kobj, &o2cb_attr_group);
         if (ret)
                 goto error;