headers: utsname.h redux

[safe/jmp/linux-2.6] / fs / ocfs2 / stackglue.c

diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
index fb9b8e0..3f2f1c4 100644 (file)
--- a/fs/ocfs2/stackglue.c
+++ b/fs/ocfs2/stackglue.c
@@ -6,7 +6,7 @@
  * Code which implements an OCFS2 specific interface to underlying
  * cluster stacks.
  *
- * Copyright (C) 2007 Oracle.  All rights reserved.
+ * Copyright (C) 2007, 2009 Oracle.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
@@ -34,11 +34,13 @@
 
 #define OCFS2_STACK_PLUGIN_O2CB                "o2cb"
 #define OCFS2_STACK_PLUGIN_USER                "user"
+#define OCFS2_MAX_HB_CTL_PATH          256
 
 static struct ocfs2_locking_protocol *lproto;
 static DEFINE_SPINLOCK(ocfs2_stack_lock);
 static LIST_HEAD(ocfs2_stack_list);
 static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1];
+static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl";
 
 /*
  * The stack currently in use.  If not null, active_stack->sp_count > 0,
@@ -95,13 +97,14 @@ static int ocfs2_stack_driver_request(const char *stack_name,
                goto out;
        }
 
-       /* Ok, the stack is pinned */
-       p->sp_count++;
        active_stack = p;
-
        rc = 0;
 
 out:
+       /* If we found it, pin it */
+       if (!rc)
+               active_stack->sp_count++;
+
        spin_unlock(&ocfs2_stack_lock);
        return rc;
 }
@@ -268,11 +271,12 @@ int ocfs2_dlm_lock_status(union ocfs2_dlm_lksb *lksb)
 }
 EXPORT_SYMBOL_GPL(ocfs2_dlm_lock_status);
 
-/*
- * Why don't we cast to ocfs2_meta_lvb?  The "clean" answer is that we
- * don't cast at the glue level.  The real answer is that the header
- * ordering is nigh impossible.
- */
+int ocfs2_dlm_lvb_valid(union ocfs2_dlm_lksb *lksb)
+{
+       return active_stack->sp_ops->lvb_valid(lksb);
+}
+EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb_valid);
+
 void *ocfs2_dlm_lvb(union ocfs2_dlm_lksb *lksb)
 {
        return active_stack->sp_ops->lock_lvb(lksb);
@@ -285,6 +289,26 @@ void ocfs2_dlm_dump_lksb(union ocfs2_dlm_lksb *lksb)
 }
 EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb);
 
+int ocfs2_stack_supports_plocks(void)
+{
+       return active_stack && active_stack->sp_ops->plock;
+}
+EXPORT_SYMBOL_GPL(ocfs2_stack_supports_plocks);
+
+/*
+ * ocfs2_plock() can only be safely called if
+ * ocfs2_stack_supports_plocks() returned true
+ */
+int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
+               struct file *file, int cmd, struct file_lock *fl)
+{
+       WARN_ON_ONCE(active_stack->sp_ops->plock == NULL);
+       if (active_stack->sp_ops->plock)
+               return active_stack->sp_ops->plock(conn, ino, file, cmd, fl);
+       return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL_GPL(ocfs2_plock);
+
 int ocfs2_cluster_connect(const char *stack_name,
                          const char *group,
                          int grouplen,
@@ -350,7 +374,7 @@ int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn,
 
        BUG_ON(conn == NULL);
 
-       ret = active_stack->sp_ops->disconnect(conn, hangup_pending);
+       ret = active_stack->sp_ops->disconnect(conn);
 
        /* XXX Should we free it anyway? */
        if (!ret) {
@@ -363,13 +387,48 @@ int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn,
 }
 EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect);
 
+/*
+ * Leave the group for this filesystem.  This is executed by a userspace
+ * program (stored in ocfs2_hb_ctl_path).
+ */
+static void ocfs2_leave_group(const char *group)
+{
+       int ret;
+       char *argv[5], *envp[3];
+
+       argv[0] = ocfs2_hb_ctl_path;
+       argv[1] = "-K";
+       argv[2] = "-u";
+       argv[3] = (char *)group;
+       argv[4] = NULL;
+
+       /* minimal command environment taken from cpu_run_sbin_hotplug */
+       envp[0] = "HOME=/";
+       envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+       envp[2] = NULL;
+
+       ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
+       if (ret < 0) {
+               printk(KERN_ERR
+                      "ocfs2: Error %d running user helper "
+                      "\"%s %s %s %s\"\n",
+                      ret, argv[0], argv[1], argv[2], argv[3]);
+       }
+}
+
+/*
+ * Hangup is a required post-umount.  ocfs2-tools software expects the
+ * filesystem to call "ocfs2_hb_ctl" during unmount.  This happens
+ * regardless of whether the DLM got started, so we can't do it
+ * in ocfs2_cluster_disconnect().  The ocfs2_leave_group() function does
+ * the actual work.
+ */
 void ocfs2_cluster_hangup(const char *group, int grouplen)
 {
        BUG_ON(group == NULL);
        BUG_ON(group[grouplen] != '\0');
 
-       if (active_stack->sp_ops->hangup)
-               active_stack->sp_ops->hangup(group, grouplen);
+       ocfs2_leave_group(group);
 
        /* cluster_disconnect() was called with hangup_pending==1 */
        ocfs2_stack_driver_put();
@@ -559,9 +618,6 @@ error:
 
 #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,
@@ -613,12 +669,6 @@ static ctl_table ocfs2_root_table[] = {
 
 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