ceph: ensure Boolean options support both senses

Many ceph-related Boolean options offer the ability to both enable
and disable a feature.  For all those that don't offer this, add
a new option so that they do.

Note that ceph_show_options()--which reports mount options currently
in effect--only reports the option if it is different from the
default value.

Signed-off-by: Alex Elder <elder@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 4fab1fd..3663cf0 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -130,10 +130,12 @@
 	Opt_nodirstat,
 	Opt_rbytes,
 	Opt_norbytes,
+	Opt_asyncreaddir,
 	Opt_noasyncreaddir,
 	Opt_dcache,
 	Opt_nodcache,
 	Opt_ino32,
+	Opt_noino32,
 };
 
 static match_table_t fsopt_tokens = {
@@ -153,10 +155,12 @@
 	{Opt_nodirstat, "nodirstat"},
 	{Opt_rbytes, "rbytes"},
 	{Opt_norbytes, "norbytes"},
+	{Opt_asyncreaddir, "asyncreaddir"},
 	{Opt_noasyncreaddir, "noasyncreaddir"},
 	{Opt_dcache, "dcache"},
 	{Opt_nodcache, "nodcache"},
 	{Opt_ino32, "ino32"},
+	{Opt_noino32, "noino32"},
 	{-1, NULL}
 };
 
@@ -232,6 +236,9 @@
 	case Opt_norbytes:
 		fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 		break;
+	case Opt_asyncreaddir:
+		fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
+		break;
 	case Opt_noasyncreaddir:
 		fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 		break;
@@ -244,6 +251,9 @@
 	case Opt_ino32:
 		fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 		break;
+	case Opt_noino32:
+		fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
+		break;
 	default:
 		BUG_ON(token);
 	}