nfsd: let "insecure" flag vary by pseudoflavor

This was an oversight; it should be among the export flags that can be
allowed to vary by pseudoflavor.  This allows an administrator to (for
example) allow auth_sys mounts only from low ports, but allow auth_krb5
mounts to use any port.
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>

fs/nfsd/nfsfh.c

@@ -88,8 +88,10 @@ nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type)
 static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
 					  struct svc_export *exp)
 {
+	int flags = nfsexp_flags(rqstp, exp);
+
 	/* Check if the request originated from a secure port. */
-	if (!rqstp->rq_secure && EX_SECURE(exp)) {
+	if (!rqstp->rq_secure && (flags & NFSEXP_INSECURE_PORT)) {
 		RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
 		dprintk(KERN_WARNING
 		       "nfsd: request from insecure port %s!\n",

include/linux/nfsd/export.h

@@ -44,7 +44,8 @@
 
 /* The flags that may vary depending on security flavor: */
 #define NFSEXP_SECINFO_FLAGS	(NFSEXP_READONLY | NFSEXP_ROOTSQUASH \
-					| NFSEXP_ALLSQUASH)
+					| NFSEXP_ALLSQUASH \
+					| NFSEXP_INSECURE_PORT)
 
 #ifdef __KERNEL__
 
@@ -109,7 +110,6 @@ struct svc_expkey {
 	struct path		ek_path;
 };
 
-#define EX_SECURE(exp)		(!((exp)->ex_flags & NFSEXP_INSECURE_PORT))
 #define EX_ISSYNC(exp)		(!((exp)->ex_flags & NFSEXP_ASYNC))
 #define EX_NOHIDE(exp)		((exp)->ex_flags & NFSEXP_NOHIDE)
 #define EX_WGATHER(exp)		((exp)->ex_flags & NFSEXP_GATHERED_WRITES)