SELinux: skip filename trans rules if ttype does not match parent dir

Right now we walk to filename trans rule list for every inode that is
created.  First passes at policy using this facility creates around 5000
filename trans rules.  Running a list of 5000 entries every time is a bad
idea.  This patch adds a new ebitmap to policy which has a bit set for each
ttype that has at least 1 filename trans rule.  Thus when an inode is
created we can quickly determine if any rules exist for this parent
directory type and can skip the list if we know there is definitely no
relevant entry.

Signed-off-by: Eric Paris <eparis@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>

security/selinux/ss/policydb.h

@@ -227,6 +227,8 @@ struct policydb {
 	/* role transitions */
 	struct role_trans *role_tr;
 
+	/* quickly exclude lookups when parent ttype has no rules */
+	struct ebitmap filename_trans_ttypes;
 	/* file transitions with the last path component */
 	struct filename_trans *filename_trans;