[PATCH] deprecate use of bdflush()

Patch from Robert Love <rml@tech9.net>

We can never get rid of it if we do not deprecate it - so do so and
print a stern warning to those who still run bdflush daemons.

fs/buffer.c

@@ -2757,11 +2757,25 @@ int block_sync_page(struct page *page)
 /*
  * There are no bdflush tunables left.  But distributions are
  * still running obsolete flush daemons, so we terminate them here.
+ *
+ * Use of bdflush() is deprecated and will be removed in a future kernel.
+ * The `pdflush' kernel threads fully replace bdflush daemons and this call.
  */
 asmlinkage long sys_bdflush(int func, long data)
 {
+	static int msg_count;
+
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
+
+	if (msg_count < 5) {
+		msg_count++;
+		printk(KERN_INFO
+			"warning: process `%s' used the obsolete bdflush"
+			" system call\n", current->comm);
+		printk(KERN_INFO "Fix your initscripts?\n");
+	}
+
 	if (func == 1)
 		do_exit(0);
 	return 0;