[PATCH 019 of 20] knfsd: nfsd: allow auth_sys nlm on rpcsec_gss exports

[NeilBrown <neilb@suse.de>]

From: J. Bruce Fields <bfields@citi.umich.edu>

Our clients (like other clients, as far as I know) use only auth_sys for
nlm, even when using rpcsec_gss for the main nfs operations.

Administrators that want to deny non-kerberos-authenticated locking
requests will need to turn off NFS protocol versions less than 4....

Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
 ./fs/nfsd/nfsfh.c |   14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff .prev/fs/nfsd/nfsfh.c ./fs/nfsd/nfsfh.c
--- .prev/fs/nfsd/nfsfh.c	2007-07-10 12:18:34.000000000 +1000
+++ ./fs/nfsd/nfsfh.c	2007-07-10 12:19:36.000000000 +1000
@@ -249,10 +249,16 @@ fh_verify(struct svc_rqst *rqstp, struct
 	if (error)
 		goto out;
 
-	/* Check security flavor */
-	error = check_nfsd_access(exp, rqstp);
-	if (error)
-		goto out;
+	if (!(access & MAY_LOCK)) {
+		/*
+		 * pseudoflavor restrictions are not enforced on NLM,
+		 * which clients virtually always use auth_sys for,
+		 * even while using RPCSEC_GSS for NFS.
+		 */
+		error = check_nfsd_access(exp, rqstp);
+		if (error)
+			goto out;
+	}
 
 	/* Finally, check access permissions. */
 	error = nfsd_permission(rqstp, exp, dentry, access);