ocfs2: Move the hb_ctl_path sysctl into the stack glue.

[linux-2.6-omap-h63xx.git] / fs / ocfs2 / stackglue.c

diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
index 119f60cea9cc27e8b2aca2214e8626e1558c7439..fb9b8e0db2602a73438f843d1628860e75e5ef28 100644 (file)
--- 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");