ocfs2: Move the hb_ctl_path sysctl into the stack glue.

ocfs2 needs to call out to the hb_ctl program at unmount for all cluster
stacks.  The first step is to move the hb_ctl_path sysctl out of the
o2cb code and into the generic stack glue.

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

1 files changed, 85 insertions, 0 deletions

diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
index 119f60cea9cc..fb9b8e0db260 100644
--- a/fs/ocfs2/stackglue.c
+++ b/fs/ocfs2/stackglue.c
@@ -26,6 +26,7 @@
 #include <linux/fs.h>
 #include <linux/kobject.h>
 #include <linux/sysfs.h>
+#include <linux/sysctl.h>
 
 #include "ocfs2_fs.h"
 
@@ -548,10 +549,92 @@ error:
         return ret;
 }
 
+/*
+ * Sysctl bits
+ *
+ * The sysctl lives at /proc/sys/fs/ocfs2/nm/hb_ctl_path.  The 'nm' doesn't
+ * make as much sense in a multiple cluster stack world, but it's safer
+ * and easier to preserve the name.
+ */
+
+#define FS_OCFS2_NM             1
+
+#define OCFS2_MAX_HB_CTL_PATH 256
+static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl";
+
+static ctl_table ocfs2_nm_table[] = {
+        {
+                .ctl_name       = 1,
+                .procname       = "hb_ctl_path",
+                .data           = ocfs2_hb_ctl_path,
+                .maxlen         = OCFS2_MAX_HB_CTL_PATH,
+                .mode           = 0644,
+                .proc_handler   = &proc_dostring,
+                .strategy       = &sysctl_string,
+        },
+        { .ctl_name = 0 }
+};
+
+static ctl_table ocfs2_mod_table[] = {
+        {
+                .ctl_name       = FS_OCFS2_NM,
+                .procname       = "nm",
+                .data           = NULL,
+                .maxlen         = 0,
+                .mode           = 0555,
+                .child          = ocfs2_nm_table
+        },
+        { .ctl_name = 0}
+};
+
+static ctl_table ocfs2_kern_table[] = {
+        {
+                .ctl_name       = FS_OCFS2,
+                .procname       = "ocfs2",
+                .data           = NULL,
+                .maxlen         = 0,
+                .mode           = 0555,
+                .child          = ocfs2_mod_table
+        },
+        { .ctl_name = 0}
+};
+
+static ctl_table ocfs2_root_table[] = {
+        {
+                .ctl_name       = CTL_FS,
+                .procname       = "fs",
+                .data           = NULL,
+                .maxlen         = 0,
+                .mode           = 0555,
+                .child          = ocfs2_kern_table
+        },
+        { .ctl_name = 0 }
+};
+
+static struct ctl_table_header *ocfs2_table_header = NULL;
+
+const char *ocfs2_get_hb_ctl_path(void)
+{
+        return ocfs2_hb_ctl_path;
+}
+EXPORT_SYMBOL_GPL(ocfs2_get_hb_ctl_path);
+
+
+/*
+ * Initialization
+ */
+
 static int __init ocfs2_stack_glue_init(void)
 {
         strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB);
 
+        ocfs2_table_header = register_sysctl_table(ocfs2_root_table);
+        if (!ocfs2_table_header) {
+                printk(KERN_ERR
+                       "ocfs2 stack glue: unable to register sysctl\n");
+                return -ENOMEM; /* or something. */
+        }
+
         return ocfs2_sysfs_init();
 }
 
@@ -559,6 +642,8 @@ static void __exit ocfs2_stack_glue_exit(void)
 {
         lproto = NULL;
         ocfs2_sysfs_exit();
+        if (ocfs2_table_header)
+                unregister_sysctl_table(ocfs2_table_header);
 }
 
 MODULE_AUTHOR("Oracle");