NFSD: Update the NFSv2 GETACL argument decoder to use struct xdr_stream

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

fs/nfsd/nfs2acl.c

@@ -188,17 +188,17 @@ static __be32 nfsacld_proc_access(struct svc_rqst *rqstp)
 
 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
 {
+	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_getaclargs *argp = rqstp->rq_argp;
 
-	p = nfs2svc_decode_fh(p, &argp->fh);
-	if (!p)
+	if (!svcxdr_decode_fhandle(xdr, &argp->fh))
+		return 0;
+	if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
 		return 0;
-	argp->mask = ntohl(*p); p++;
 
-	return xdr_argsize_check(rqstp, p);
+	return 1;
 }
 
-
 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)
 {
 	struct nfsd3_setaclargs *argp = rqstp->rq_argp;

fs/nfsd/nfsxdr.c

@@ -38,7 +38,16 @@ decode_fh(__be32 *p, struct svc_fh *fhp)
 	return p + (NFS_FHSIZE >> 2);
 }
 
-static bool
+/**
+ * svcxdr_decode_fhandle - Decode an NFSv2 file handle
+ * @xdr: XDR stream positioned at an encoded NFSv2 FH
+ * @fhp: OUT: filled-in server file handle
+ *
+ * Return values:
+ *  %false: The encoded file handle was not valid
+ *  %true: @fhp has been initialized
+ */
+bool
 svcxdr_decode_fhandle(struct xdr_stream *xdr, struct svc_fh *fhp)
 {
 	__be32 *p;

fs/nfsd/xdr.h

@@ -165,5 +165,6 @@ void nfssvc_release_readres(struct svc_rqst *rqstp);
 /* Helper functions for NFSv2 ACL code */
 __be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat);
 __be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp);
+bool svcxdr_decode_fhandle(struct xdr_stream *xdr, struct svc_fh *fhp);
 
 #endif /* LINUX_NFSD_H */

fs/nfsd/xdr3.h

@@ -102,7 +102,7 @@ struct nfsd3_commitargs {
 
 struct nfsd3_getaclargs {
 	struct svc_fh		fh;
-	int			mask;
+	__u32			mask;
 };
 
 struct posix_acl;