ceph: fix debugfs entry, simplify fsid checks

We may first learn our fsid from any of the mon, osd, or mds maps
(whichever the monitor sends first).  Consolidate checks in a single
helper.  Initialize the client debugfs entry then, since we need the
fsid (and global_id) for the directory name.

Also remove dead mount code.

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c
index 9b20206..b90fc3e 100644
--- a/fs/ceph/debugfs.c
+++ b/fs/ceph/debugfs.c
@@ -7,6 +7,8 @@
 
 #include "super.h"
 #include "mds_client.h"
+#include "mon_client.h"
+#include "auth.h"
 
 #ifdef CONFIG_DEBUG_FS
 
@@ -335,7 +337,7 @@
 	char name[80];
 
 	snprintf(name, sizeof(name), FSID_FORMAT ".client%lld",
-		 PR_FSID(&client->monc.monmap->fsid), client->whoami);
+		 PR_FSID(&client->fsid), client->monc.auth->global_id);
 
 	client->debugfs_dir = debugfs_create_dir(name, ceph_debugfs_dir);
 	if (!client->debugfs_dir)