ocfs2: Allow selection of cluster plug-ins.

ocfs2 now supports plug-ins for the classic O2CB stack as well as
userspace cluster stacks in conjunction with fs/dlm.  This allows zero,
one, or both of the plug-ins to be selected in Kconfig.  For local mounts
(non-clustered), neither plug-in is needed.  Both plugins can be loaded
at one time, the runtime will select the one needed for the cluster
systme in use.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

2 files changed, 32 insertions, 4 deletions

diff --git a/fs/Kconfig b/fs/Kconfig
index c509123bea49..028ae38ecc52 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -444,6 +444,32 @@ config OCFS2_FS
           For more information on OCFS2, see the file
           <file:Documentation/filesystems/ocfs2.txt>.
 
+config OCFS2_FS_O2CB
+        tristate "O2CB Kernelspace Clustering"
+        depends on OCFS2_FS
+        default y
+        help
+          OCFS2 includes a simple kernelspace clustering package, the OCFS2
+          Cluster Base.  It only requires a very small userspace component
+          to configure it. This comes with the standard ocfs2-tools package.
+          O2CB is limited to maintaining a cluster for OCFS2 file systems.
+          It cannot manage any other cluster applications.
+
+          It is always safe to say Y here, as the clustering method is
+          run-time selectable.
+
+config OCFS2_FS_USERSPACE_CLUSTER
+        tristate "OCFS2 Userspace Clustering"
+        depends on OCFS2_FS && DLM
+        default y
+        help
+          This option will allow OCFS2 to use userspace clustering services
+          in conjunction with the DLM in fs/dlm.  If you are using a
+          userspace cluster manager, say Y here.
+
+          It is safe to say Y, as the clustering method is run-time
+          selectable.
+
 config OCFS2_DEBUG_MASKLOG
         bool "OCFS2 logging support"
         depends on OCFS2_FS
diff --git a/fs/ocfs2/Makefile b/fs/ocfs2/Makefile
index b8d6d0225737..f6956de56fdb 100644
--- a/fs/ocfs2/Makefile
+++ b/fs/ocfs2/Makefile
@@ -4,9 +4,10 @@ EXTRA_CFLAGS += -DCATCH_BH_JBD_RACES
 
 obj-$(CONFIG_OCFS2_FS) +=       \
         ocfs2.o                 \
-        ocfs2_stackglue.o       \
-        ocfs2_stack_o2cb.o      \
-        ocfs2_stack_user.o
+        ocfs2_stackglue.o
+
+obj-$(CONFIG_OCFS2_FS_O2CB) += ocfs2_stack_o2cb.o
+obj-$(CONFIG_OCFS2_FS_USERSPACE_CLUSTER) += ocfs2_stack_user.o
 
 ocfs2-objs := \
         alloc.o                 \
@@ -39,5 +40,6 @@ ocfs2_stackglue-objs := stackglue.o
 ocfs2_stack_o2cb-objs := stack_o2cb.o
 ocfs2_stack_user-objs := stack_user.o
 
+# cluster/ is always needed when OCFS2_FS for masklog support
 obj-$(CONFIG_OCFS2_FS) += cluster/
-obj-$(CONFIG_OCFS2_FS) += dlm/
+obj-$(CONFIG_OCFS2_FS_O2CB) += dlm/