nfsd: rename MAY_ flags

Rename nfsd_permission() specific MAY_* flags to NFSD_MAY_* to make it
clear, that these are not used outside nfsd, and to avoid name and
number space conflicts with the VFS.

[comment from hch: rename MAY_READ, MAY_WRITE and MAY_EXEC as well]

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index 100ae56..c7b0fda 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -279,7 +279,7 @@
 	if (error)
 		goto out;
 
-	if (!(access & MAY_LOCK)) {
+	if (!(access & NFSD_MAY_LOCK)) {
 		/*
 		 * pseudoflavor restrictions are not enforced on NLM,
 		 * which clients virtually always use auth_sys for,