diff --git a/fs/nfsd/auth.c b/fs/nfsd/auth.c
new file mode 100644
index 0000000..cfe9ce8
--- /dev/null
+++ b/fs/nfsd/auth.c
@@ -0,0 +1,63 @@
+/*
+ * linux/fs/nfsd/auth.c
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/svcauth.h>
+#include <linux/nfsd/nfsd.h>
+
+#define	CAP_NFSD_MASK (CAP_FS_MASK|CAP_TO_MASK(CAP_SYS_RESOURCE))
+
+int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
+{
+	struct svc_cred	*cred = &rqstp->rq_cred;
+	int i;
+	int ret;
+
+	if (exp->ex_flags & NFSEXP_ALLSQUASH) {
+		cred->cr_uid = exp->ex_anon_uid;
+		cred->cr_gid = exp->ex_anon_gid;
+		put_group_info(cred->cr_group_info);
+		cred->cr_group_info = groups_alloc(0);
+	} else if (exp->ex_flags & NFSEXP_ROOTSQUASH) {
+		struct group_info *gi;
+		if (!cred->cr_uid)
+			cred->cr_uid = exp->ex_anon_uid;
+		if (!cred->cr_gid)
+			cred->cr_gid = exp->ex_anon_gid;
+		gi = groups_alloc(cred->cr_group_info->ngroups);
+		if (gi)
+			for (i = 0; i < cred->cr_group_info->ngroups; i++) {
+				if (!GROUP_AT(cred->cr_group_info, i))
+					GROUP_AT(gi, i) = exp->ex_anon_gid;
+				else
+					GROUP_AT(gi, i) = GROUP_AT(cred->cr_group_info, i);
+			}
+		put_group_info(cred->cr_group_info);
+		cred->cr_group_info = gi;
+	}
+
+	if (cred->cr_uid != (uid_t) -1)
+		current->fsuid = cred->cr_uid;
+	else
+		current->fsuid = exp->ex_anon_uid;
+	if (cred->cr_gid != (gid_t) -1)
+		current->fsgid = cred->cr_gid;
+	else
+		current->fsgid = exp->ex_anon_gid;
+
+	if (!cred->cr_group_info)
+		return -ENOMEM;
+	ret = set_current_groups(cred->cr_group_info);
+	if ((cred->cr_uid)) {
+		cap_t(current->cap_effective) &= ~CAP_NFSD_MASK;
+	} else {
+		cap_t(current->cap_effective) |= (CAP_NFSD_MASK &
+						  current->cap_permitted);
+	}
+	return ret;
+}