NFS: Introduce new-style XDR decoding functions for NFSv2

We'd like to prevent local buffer overflows caused by malicious or
broken servers. New xdr_stream style decoders can do that.

For efficiency, we also eventually want to be able to pass xdr_streams
from call_decode() to all XDR decoding functions, rather than building
an xdr_stream in every XDR decoding function in the kernel.

Static helper functions are left without the "inline" directive. This
allows the compiler to choose automatically how to optimize these for
size or speed.

Signed-off-by: Chuck Lever <[e-mail]>
Tested-by: J. Bruce Fields <[e-mail]>
Signed-off-by: Trond Myklebust <[e-mail]>

fs/nfs/nfs3xdr.c

···
 	[NF3FIFO] = S_IFIFO,
 };
 
-static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
-{
-	dprintk("nfs: %s: prematurely hit end of receive buffer. "
-		"Remaining buffer length is %tu words.\n",
-		func, xdr->end - xdr->p);
-}
-
 /*
  * While encoding arguments, set up the reply buffer in advance to
  * receive reply data directly into the page cache.
···
 
 	replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
 	xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
+}
+
+/*
+ * Handle decode buffer overflows out-of-line.
+ */
+static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
+{
+	dprintk("NFS: %s prematurely hit the end of our receive buffer. "
+		"Remaining buffer length is %tu words.\n",
+		func, xdr->end - xdr->p);
 }
 
 
···
 	*p = cpu_to_be32(value);
 }
 
+static int decode_uint32(struct xdr_stream *xdr, u32 *value)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	*value = be32_to_cpup(p);
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+static int decode_uint64(struct xdr_stream *xdr, u64 *value)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 8);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	xdr_decode_hyper(p, value);
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+/*
+ * fileid3
+ *
+ *	typedef uint64 fileid3;
+ */
+static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
+{
+	return decode_uint64(xdr, fileid);
+}
+
 /*
  * filename3
  *
···
 	xdr_encode_opaque(p, name, length);
 }
 
+static int decode_inline_filename3(struct xdr_stream *xdr,
+				   const char **name, u32 *length)
+{
+	__be32 *p;
+	u32 count;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	count = be32_to_cpup(p);
+	if (count > NFS3_MAXNAMLEN)
+		goto out_nametoolong;
+	p = xdr_inline_decode(xdr, count);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	*name = (const char *)p;
+	*length = count;
+	return 0;
+
+out_nametoolong:
+	dprintk("NFS: returned filename too long: %u\n", count);
+	return -ENAMETOOLONG;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
 /*
  * nfspath3
  *
···
 	xdr_write_pages(xdr, pages, 0, length);
 }
 
+static int decode_nfspath3(struct xdr_stream *xdr)
+{
+	u32 recvd, count;
+	size_t hdrlen;
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	count = be32_to_cpup(p);
+	if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
+		goto out_nametoolong;
+	hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
+	recvd = xdr->buf->len - hdrlen;
+	if (unlikely(count > recvd))
+		goto out_cheating;
+
+	xdr_read_pages(xdr, count);
+	xdr_terminate_string(xdr->buf, count);
+	return 0;
+
+out_nametoolong:
+	dprintk("NFS: returned pathname too long: %u\n", count);
+	return -ENAMETOOLONG;
+out_cheating:
+	dprintk("NFS: server cheating in pathname result: "
+		"count %u > recvd %u\n", count, recvd);
+	return -EIO;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
 /*
  * cookie3
  *
···
 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
 {
 	return xdr_encode_hyper(p, cookie);
+}
+
+static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
+{
+	return decode_uint64(xdr, cookie);
 }
 
 /*
···
 	return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
 }
 
+static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
 /*
  * createverf3
  *
···
 
 	p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
 	memcpy(p, verifier, NFS3_CREATEVERFSIZE);
+}
+
+static int decode_writeverf3(struct xdr_stream *xdr, __be32 *verifier)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	memcpy(verifier, p, NFS3_WRITEVERFSIZE);
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+/*
+ * size3
+ *
+ *	typedef uint64 size3;
+ */
+static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
+{
+	return xdr_decode_hyper(p, size);
+}
+
+/*
+ * nfsstat3
+ *
+ *	enum nfsstat3 {
+ *		NFS3_OK = 0,
+ *		...
+ *	}
+ */
+#define NFS3_OK		NFS_OK
+
+static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	*status = be32_to_cpup(p);
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
 }
 
 /*
···
 	BUG_ON(fh->size > NFS3_FHSIZE);
 	p = xdr_reserve_space(xdr, 4 + fh->size);
 	xdr_encode_opaque(p, fh->data, fh->size);
+}
+
+static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
+{
+	u32 length;
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	length = be32_to_cpup(p++);
+	if (unlikely(length > NFS3_FHSIZE))
+		goto out_toobig;
+	p = xdr_inline_decode(xdr, length);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	fh->size = length;
+	memcpy(fh->data, p, length);
+	return 0;
+out_toobig:
+	dprintk("NFS: file handle size (%u) too big\n", length);
+	return -E2BIG;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+static void zero_nfs_fh3(struct nfs_fh *fh)
+{
+	memset(fh, 0, sizeof(*fh));
 }
 
 /*
···
 		*p = xdr_one;
 	} else
 		*p = xdr_zero;
+}
+
+/*
+ * fattr3
+ *
+ *	struct fattr3 {
+ *		ftype3		type;
+ *		mode3		mode;
+ *		uint32		nlink;
+ *		uid3		uid;
+ *		gid3		gid;
+ *		size3		size;
+ *		size3		used;
+ *		specdata3	rdev;
+ *		uint64		fsid;
+ *		fileid3		fileid;
+ *		nfstime3	atime;
+ *		nfstime3	mtime;
+ *		nfstime3	ctime;
+ *	};
+ */
+static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	xdr_decode_fattr(p, fattr);
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+/*
+ * post_op_attr
+ *
+ *	union post_op_attr switch (bool attributes_follow) {
+ *	case TRUE:
+ *		fattr3	attributes;
+ *	case FALSE:
+ *		void;
+ *	};
+ */
+static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	if (*p != xdr_zero)
+		return decode_fattr3(xdr, fattr);
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+/*
+ * wcc_attr
+ *	struct wcc_attr {
+ *		size3		size;
+ *		nfstime3	mtime;
+ *		nfstime3	ctime;
+ *	};
+ */
+static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	xdr_decode_wcc_attr(p, fattr);
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+/*
+ * pre_op_attr
+ *	union pre_op_attr switch (bool attributes_follow) {
+ *	case TRUE:
+ *		wcc_attr	attributes;
+ *	case FALSE:
+ *		void;
+ *	};
+ *
+ * wcc_data
+ *
+ *	struct wcc_data {
+ *		pre_op_attr	before;
+ *		post_op_attr	after;
+ *	};
+ */
+static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	if (*p != xdr_zero)
+		return decode_wcc_attr(xdr, fattr);
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
+{
+	int error;
+
+	error = decode_pre_op_attr(xdr, fattr);
+	if (unlikely(error))
+		goto out;
+	error = decode_post_op_attr(xdr, fattr);
+out:
+	return error;
+}
+
+/*
+ * post_op_fh3
+ *
+ *	union post_op_fh3 switch (bool handle_follows) {
+ *	case TRUE:
+ *		nfs_fh3  handle;
+ *	case FALSE:
+ *		void;
+ *	};
+ */
+static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
+{
+	__be32 *p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	if (*p != xdr_zero)
+		return decode_nfs_fh3(xdr, fh);
+	zero_nfs_fh3(fh);
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
 }
 
 /*
···
 	return pglen;
 }
 
-__be32 *
-nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry, struct nfs_server *server, int plus)
-{
-	__be32 *p;
-	struct nfs_entry old = *entry;
-
-	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(!p))
-		goto out_overflow;
-	if (!ntohl(*p++)) {
-		p = xdr_inline_decode(xdr, 4);
-		if (unlikely(!p))
-			goto out_overflow;
-		if (!ntohl(*p++))
-			return ERR_PTR(-EAGAIN);
-		entry->eof = 1;
-		return ERR_PTR(-EBADCOOKIE);
-	}
-
-	p = xdr_inline_decode(xdr, 12);
-	if (unlikely(!p))
-		goto out_overflow;
-	p = xdr_decode_hyper(p, &entry->ino);
-	entry->len  = ntohl(*p++);
-
-	p = xdr_inline_decode(xdr, entry->len + 8);
-	if (unlikely(!p))
-		goto out_overflow;
-	entry->name = (const char *) p;
-	p += XDR_QUADLEN(entry->len);
-	entry->prev_cookie = entry->cookie;
-	p = xdr_decode_hyper(p, &entry->cookie);
-
-	entry->d_type = DT_UNKNOWN;
-	if (plus) {
-		entry->fattr->valid = 0;
-		p = xdr_decode_post_op_attr_stream(xdr, entry->fattr);
-		if (IS_ERR(p))
-			goto out_overflow_exit;
-		entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
-		/* In fact, a post_op_fh3: */
-		p = xdr_inline_decode(xdr, 4);
-		if (unlikely(!p))
-			goto out_overflow;
-		if (*p++) {
-			p = xdr_decode_fhandle_stream(xdr, entry->fh);
-			if (IS_ERR(p))
-				goto out_overflow_exit;
-			/* Ugh -- server reply was truncated */
-			if (p == NULL) {
-				dprintk("NFS: FH truncated\n");
-				*entry = old;
-				return ERR_PTR(-EAGAIN);
-			}
-		} else
-			memset((u8*)(entry->fh), 0, sizeof(*entry->fh));
-	}
-
-	p = xdr_inline_peek(xdr, 8);
-	if (p != NULL)
-		entry->eof = !p[0] && p[1];
-	else
-		entry->eof = 0;
-
-	return p;
-
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-out_overflow_exit:
-	return ERR_PTR(-EAGAIN);
-}
-
 /*
  * 3.3.21  COMMIT3args
  *
···
 }
 
 /*
+ * 3.3.1  GETATTR3res
+ *
+ *	struct GETATTR3resok {
+ *		fattr3		obj_attributes;
+ *	};
+ *
+ *	union GETATTR3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		GETATTR3resok  resok;
+ *	default:
+ *		void;
+ *	};
+ */
+static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req, __be32 *p,
+				    struct nfs_fattr *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_default;
+	error = decode_fattr3(&xdr, result);
+out:
+	return error;
+out_default:
+	return nfs_stat_to_errno(status);
+}
+
+/*
  * Decode status+wcc_data reply
  * SATTR, REMOVE, RMDIR
  */
···
 		status = nfs_stat_to_errno(status);
 	xdr_decode_wcc_data(p, fattr);
 	return status;
+}
+
+/*
+ * 3.3.2  SETATTR3res
+ *
+ *	struct SETATTR3resok {
+ *		wcc_data  obj_wcc;
+ *	};
+ *
+ *	struct SETATTR3resfail {
+ *		wcc_data  obj_wcc;
+ *	};
+ *
+ *	union SETATTR3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		SETATTR3resok   resok;
+ *	default:
+ *		SETATTR3resfail resfail;
+ *	};
+ */
+static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req, __be32 *p,
+				    struct nfs_fattr *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	error = decode_wcc_data(&xdr, result);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_status;
+out:
+	return error;
+out_status:
+	return nfs_stat_to_errno(status);
 }
 
 static int
···
 }
 
 /*
+ * 3.3.3  LOOKUP3res
+ *
+ *	struct LOOKUP3resok {
+ *		nfs_fh3		object;
+ *		post_op_attr	obj_attributes;
+ *		post_op_attr	dir_attributes;
+ *	};
+ *
+ *	struct LOOKUP3resfail {
+ *		post_op_attr	dir_attributes;
+ *	};
+ *
+ *	union LOOKUP3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		LOOKUP3resok	resok;
+ *	default:
+ *		LOOKUP3resfail	resfail;
+ *	};
+ */
+static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req, __be32 *p,
+				   struct nfs3_diropres *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_default;
+	error = decode_nfs_fh3(&xdr, result->fh);
+	if (unlikely(error))
+		goto out;
+	error = decode_post_op_attr(&xdr, result->fattr);
+	if (unlikely(error))
+		goto out;
+	error = decode_post_op_attr(&xdr, result->dir_attr);
+out:
+	return error;
+out_default:
+	error = decode_post_op_attr(&xdr, result->dir_attr);
+	if (unlikely(error))
+		goto out;
+	return nfs_stat_to_errno(status);
+}
+
+/*
  * Decode ACCESS reply
  */
 static int
···
 		return nfs_stat_to_errno(status);
 	res->access = ntohl(*p++);
 	return 0;
+}
+
+/*
+ * 3.3.4  ACCESS3res
+ *
+ *	struct ACCESS3resok {
+ *		post_op_attr	obj_attributes;
+ *		uint32		access;
+ *	};
+ *
+ *	struct ACCESS3resfail {
+ *		post_op_attr	obj_attributes;
+ *	};
+ *
+ *	union ACCESS3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		ACCESS3resok	resok;
+ *	default:
+ *		ACCESS3resfail	resfail;
+ *	};
+ */
+static int nfs3_xdr_dec_access3res(struct rpc_rqst *req, __be32 *p,
+				   struct nfs3_accessres *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	error = decode_post_op_attr(&xdr, result->fattr);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_default;
+	error = decode_uint32(&xdr, &result->access);
+out:
+	return error;
+out_default:
+	return nfs_stat_to_errno(status);
 }
 
 /*
···
 
 	xdr_terminate_string(rcvbuf, len);
 	return 0;
+}
+
+/*
+ * 3.3.5  READLINK3res
+ *
+ *	struct READLINK3resok {
+ *		post_op_attr	symlink_attributes;
+ *		nfspath3	data;
+ *	};
+ *
+ *	struct READLINK3resfail {
+ *		post_op_attr	symlink_attributes;
+ *	};
+ *
+ *	union READLINK3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		READLINK3resok	resok;
+ *	default:
+ *		READLINK3resfail resfail;
+ *	};
+ */
+static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req, __be32 *p,
+				     struct nfs_fattr *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	error = decode_post_op_attr(&xdr, result);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_default;
+	error = decode_nfspath3(&xdr);
+out:
+	return error;
+out_default:
+	return nfs_stat_to_errno(status);
 }
 
 /*
···
 }
 
 /*
+ * 3.3.6  READ3res
+ *
+ *	struct READ3resok {
+ *		post_op_attr	file_attributes;
+ *		count3		count;
+ *		bool		eof;
+ *		opaque		data<>;
+ *	};
+ *
+ *	struct READ3resfail {
+ *		post_op_attr	file_attributes;
+ *	};
+ *
+ *	union READ3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		READ3resok	resok;
+ *	default:
+ *		READ3resfail	resfail;
+ *	};
+ */
+static int decode_read3resok(struct xdr_stream *xdr,
+			     struct nfs_readres *result)
+{
+	u32 eof, count, ocount, recvd;
+	size_t hdrlen;
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4 + 4 + 4);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	count = be32_to_cpup(p++);
+	eof = be32_to_cpup(p++);
+	ocount = be32_to_cpup(p++);
+	if (unlikely(ocount != count))
+		goto out_mismatch;
+	hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
+	recvd = xdr->buf->len - hdrlen;
+	if (unlikely(count > recvd))
+		goto out_cheating;
+
+out:
+	xdr_read_pages(xdr, count);
+	result->eof = eof;
+	result->count = count;
+	return count;
+out_mismatch:
+	dprintk("NFS: READ count doesn't match length of opaque: "
+		"count %u != ocount %u\n", count, ocount);
+	return -EIO;
+out_cheating:
+	dprintk("NFS: server cheating in read result: "
+		"count %u > recvd %u\n", count, recvd);
+	count = recvd;
+	eof = 0;
+	goto out;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, __be32 *p,
+				 struct nfs_readres *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	error = decode_post_op_attr(&xdr, result->fattr);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_status;
+	error = decode_read3resok(&xdr, result);
+out:
+	return error;
+out_status:
+	return nfs_stat_to_errno(status);
+}
+
+/*
  * Decode WRITE response
  */
 static int
···
 	res->verf->verifier[1] = *p++;
 
 	return res->count;
+}
+
+/*
+ * 3.3.7  WRITE3res
+ *
+ *	enum stable_how {
+ *		UNSTABLE  = 0,
+ *		DATA_SYNC = 1,
+ *		FILE_SYNC = 2
+ *	};
+ *
+ *	struct WRITE3resok {
+ *		wcc_data	file_wcc;
+ *		count3		count;
+ *		stable_how	committed;
+ *		writeverf3	verf;
+ *	};
+ *
+ *	struct WRITE3resfail {
+ *		wcc_data	file_wcc;
+ *	};
+ *
+ *	union WRITE3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		WRITE3resok	resok;
+ *	default:
+ *		WRITE3resfail	resfail;
+ *	};
+ */
+static int decode_write3resok(struct xdr_stream *xdr,
+			      struct nfs_writeres *result)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4 + 4 + NFS3_WRITEVERFSIZE);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	result->count = be32_to_cpup(p++);
+	result->verf->committed = be32_to_cpup(p++);
+	if (unlikely(result->verf->committed > NFS_FILE_SYNC))
+		goto out_badvalue;
+	memcpy(result->verf->verifier, p, NFS3_WRITEVERFSIZE);
+	return result->count;
+out_badvalue:
+	dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
+	return -EIO;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, __be32 *p,
+				  struct nfs_writeres *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	error = decode_wcc_data(&xdr, result->fattr);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_status;
+	error = decode_write3resok(&xdr, result);
+out:
+	return error;
+out_status:
+	return nfs_stat_to_errno(status);
 }
 
 /*
···
 }
 
 /*
+ * 3.3.8  CREATE3res
+ *
+ *	struct CREATE3resok {
+ *		post_op_fh3	obj;
+ *		post_op_attr	obj_attributes;
+ *		wcc_data	dir_wcc;
+ *	};
+ *
+ *	struct CREATE3resfail {
+ *		wcc_data	dir_wcc;
+ *	};
+ *
+ *	union CREATE3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		CREATE3resok	resok;
+ *	default:
+ *		CREATE3resfail	resfail;
+ *	};
+ */
+static int decode_create3resok(struct xdr_stream *xdr,
+			       struct nfs3_diropres *result)
+{
+	int error;
+
+	error = decode_post_op_fh3(xdr, result->fh);
+	if (unlikely(error))
+		goto out;
+	error = decode_post_op_attr(xdr, result->fattr);
+	if (unlikely(error))
+		goto out;
+	/* The server isn't required to return a file handle.
+	 * If it didn't, force the client to perform a LOOKUP
+	 * to determine the correct file handle and attribute
+	 * values for the new object. */
+	if (result->fh->size == 0)
+		result->fattr->valid = 0;
+	error = decode_wcc_data(xdr, result->dir_attr);
+out:
+	return error;
+}
+
+static int nfs3_xdr_dec_create3res(struct rpc_rqst *req, __be32 *p,
+				   struct nfs3_diropres *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_default;
+	error = decode_create3resok(&xdr, result);
+out:
+	return error;
+out_default:
+	error = decode_wcc_data(&xdr, result->dir_attr);
+	if (unlikely(error))
+		goto out;
+	return nfs_stat_to_errno(status);
+}
+
+/*
+ * 3.3.12  REMOVE3res
+ *
+ *	struct REMOVE3resok {
+ *		wcc_data    dir_wcc;
+ *	};
+ *
+ *	struct REMOVE3resfail {
+ *		wcc_data    dir_wcc;
+ *	};
+ *
+ *	union REMOVE3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		REMOVE3resok   resok;
+ *	default:
+ *		REMOVE3resfail resfail;
+ *	};
+ */
+static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req, __be32 *p,
+				   struct nfs_removeres *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	error = decode_wcc_data(&xdr, result->dir_attr);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_status;
+out:
+	return error;
+out_status:
+	return nfs_stat_to_errno(status);
+}
+
+/*
  * Decode RENAME reply
  */
 static int
···
 }
 
 /*
+ * 3.3.14  RENAME3res
+ *
+ *	struct RENAME3resok {
+ *		wcc_data	fromdir_wcc;
+ *		wcc_data	todir_wcc;
+ *	};
+ *
+ *	struct RENAME3resfail {
+ *		wcc_data	fromdir_wcc;
+ *		wcc_data	todir_wcc;
+ *	};
+ *
+ *	union RENAME3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		RENAME3resok   resok;
+ *	default:
+ *		RENAME3resfail resfail;
+ *	};
+ */
+static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req, __be32 *p,
+				   struct nfs_renameres *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	error = decode_wcc_data(&xdr, result->old_fattr);
+	if (unlikely(error))
+		goto out;
+	error = decode_wcc_data(&xdr, result->new_fattr);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_status;
+out:
+	return error;
+out_status:
+	return nfs_stat_to_errno(status);
+}
+
+/*
  * Decode LINK reply
  */
 static int
···
 	p = xdr_decode_post_op_attr(p, res->fattr);
 	p = xdr_decode_wcc_data(p, res->dir_attr);
 	return status;
+}
+
+/*
+ * 3.3.15  LINK3res
+ *
+ *	struct LINK3resok {
+ *		post_op_attr	file_attributes;
+ *		wcc_data	linkdir_wcc;
+ *	};
+ *
+ *	struct LINK3resfail {
+ *		post_op_attr	file_attributes;
+ *		wcc_data	linkdir_wcc;
+ *	};
+ *
+ *	union LINK3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		LINK3resok	resok;
+ *	default:
+ *		LINK3resfail	resfail;
+ *	};
+ */
+static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, __be32 *p,
+				 struct nfs3_linkres *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	error = decode_post_op_attr(&xdr, result->fattr);
+	if (unlikely(error))
+		goto out;
+	error = decode_wcc_data(&xdr, result->dir_attr);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_status;
+out:
+	return error;
+out_status:
+	return nfs_stat_to_errno(status);
+}
+
+/**
+ * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
+ *			the local page cache
+ * @xdr: XDR stream where entry resides
+ * @entry: buffer to fill in with entry data
+ * @server: nfs_server data for this directory
+ * @plus: boolean indicating whether this should be a readdirplus entry
+ *
+ * Returns the position of the next item in the buffer, or an ERR_PTR.
+ *
+ * This function is not invoked during READDIR reply decoding, but
+ * rather whenever an application invokes the getdents(2) system call
+ * on a directory already in our cache.
+ *
+ * 3.3.16  entry3
+ *
+ *	struct entry3 {
+ *		fileid3		fileid;
+ *		filename3	name;
+ *		cookie3		cookie;
+ *		fhandle3	filehandle;
+ *		post_op_attr3	attributes;
+ *		entry3		*nextentry;
+ *	};
+ *
+ * 3.3.17  entryplus3
+ *	struct entryplus3 {
+ *		fileid3		fileid;
+ *		filename3	name;
+ *		cookie3		cookie;
+ *		post_op_attr	name_attributes;
+ *		post_op_fh3	name_handle;
+ *		entryplus3	*nextentry;
+ *	};
+ */
+__be32 *nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
+			   struct nfs_server *server, int plus)
+{
+	struct nfs_entry old = *entry;
+	__be32 *p;
+	int error;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	if (*p == xdr_zero) {
+		p = xdr_inline_decode(xdr, 4);
+		if (unlikely(p == NULL))
+			goto out_overflow;
+		if (*p == xdr_zero)
+			return ERR_PTR(-EAGAIN);
+		entry->eof = 1;
+		return ERR_PTR(-EBADCOOKIE);
+	}
+
+	error = decode_fileid3(xdr, &entry->ino);
+	if (unlikely(error))
+		return ERR_PTR(error);
+
+	error = decode_inline_filename3(xdr, &entry->name, &entry->len);
+	if (unlikely(error))
+		return ERR_PTR(error);
+
+	entry->prev_cookie = entry->cookie;
+	error = decode_cookie3(xdr, &entry->cookie);
+	if (unlikely(error))
+		return ERR_PTR(error);
+
+	entry->d_type = DT_UNKNOWN;
+
+	if (plus) {
+		entry->fattr->valid = 0;
+		error = decode_post_op_attr(xdr, entry->fattr);
+		if (unlikely(error))
+			return ERR_PTR(error);
+		if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
+			entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
+
+		/* In fact, a post_op_fh3: */
+		p = xdr_inline_decode(xdr, 4);
+		if (unlikely(p == NULL))
+			goto out_overflow;
+		if (*p != xdr_zero) {
+			error = decode_nfs_fh3(xdr, entry->fh);
+			if (unlikely(error)) {
+				if (error == -E2BIG)
+					goto out_truncated;
+				return ERR_PTR(error);
+			}
+		} else
+			zero_nfs_fh3(entry->fh);
+	}
+
+	/* Peek at the next entry to see if we're at EOD */
+	p = xdr_inline_peek(xdr, 4 + 4);
+	entry->eof = 0;
+	if (p != NULL)
+		entry->eof = (p[0] == xdr_zero) && (p[1] != xdr_zero);
+	return p;
+
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return ERR_PTR(-EAGAIN);
+out_truncated:
+	dprintk("NFS: directory entry contains invalid file handle\n");
+	*entry = old;
+	return ERR_PTR(-EAGAIN);
+}
+
+/*
+ * 3.3.16  READDIR3res
+ *
+ *	struct dirlist3 {
+ *		entry3		*entries;
+ *		bool		eof;
+ *	};
+ *
+ *	struct READDIR3resok {
+ *		post_op_attr	dir_attributes;
+ *		cookieverf3	cookieverf;
+ *		dirlist3	reply;
+ *	};
+ *
+ *	struct READDIR3resfail {
+ *		post_op_attr	dir_attributes;
+ *	};
+ *
+ *	union READDIR3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		READDIR3resok	resok;
+ *	default:
+ *		READDIR3resfail	resfail;
+ *	};
+ *
+ * Read the directory contents into the page cache, but otherwise
+ * don't touch them.  The actual decoding is done by nfs3_decode_entry()
+ * during subsequent nfs_readdir() calls.
+ */
+static int decode_dirlist3(struct xdr_stream *xdr)
+{
+	u32 recvd, pglen;
+	size_t hdrlen;
+
+	pglen = xdr->buf->page_len;
+	hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
+	recvd = xdr->buf->len - hdrlen;
+	if (unlikely(pglen > recvd))
+		goto out_cheating;
+out:
+	xdr_read_pages(xdr, pglen);
+	return pglen;
+out_cheating:
+	dprintk("NFS: server cheating in readdir result: "
+		"pglen %u > recvd %u\n", pglen, recvd);
+	pglen = recvd;
+	goto out;
+}
+
+static int decode_readdir3resok(struct xdr_stream *xdr,
+				struct nfs3_readdirres *result)
+{
+	int error;
+
+	error = decode_post_op_attr(xdr, result->dir_attr);
+	if (unlikely(error))
+		goto out;
+	/* XXX: do we need to check if result->verf != NULL ? */
+	error = decode_cookieverf3(xdr, result->verf);
+	if (unlikely(error))
+		goto out;
+	error = decode_dirlist3(xdr);
+out:
+	return error;
+}
+
+static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req, __be32 *p,
+				    struct nfs3_readdirres *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_default;
+	error = decode_readdir3resok(&xdr, result);
+out:
+	return error;
+out_default:
+	error = decode_post_op_attr(&xdr, result->dir_attr);
+	if (unlikely(error))
+		goto out;
+	return nfs_stat_to_errno(status);
 }
 
 /*
···
 
 	/* ignore invarsec */
 	return 0;
+}
+
+/*
+ * 3.3.18  FSSTAT3res
+ *
+ *	struct FSSTAT3resok {
+ *		post_op_attr	obj_attributes;
+ *		size3		tbytes;
+ *		size3		fbytes;
+ *		size3		abytes;
+ *		size3		tfiles;
+ *		size3		ffiles;
+ *		size3		afiles;
+ *		uint32		invarsec;
+ *	};
+ *
+ *	struct FSSTAT3resfail {
+ *		post_op_attr	obj_attributes;
+ *	};
+ *
+ *	union FSSTAT3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		FSSTAT3resok	resok;
+ *	default:
+ *		FSSTAT3resfail	resfail;
+ *	};
+ */
+static int decode_fsstat3resok(struct xdr_stream *xdr,
+			       struct nfs_fsstat *result)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 8 * 6 + 4);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	p = xdr_decode_size3(p, &result->tbytes);
+	p = xdr_decode_size3(p, &result->fbytes);
+	p = xdr_decode_size3(p, &result->abytes);
+	p = xdr_decode_size3(p, &result->tfiles);
+	p = xdr_decode_size3(p, &result->ffiles);
+	xdr_decode_size3(p, &result->afiles);
+	/* ignore invarsec */
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req, __be32 *p,
+				   struct nfs_fsstat *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	error = decode_post_op_attr(&xdr, result->fattr);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_status;
+	error = decode_fsstat3resok(&xdr, result);
+out:
+	return error;
+out_status:
+	return nfs_stat_to_errno(status);
 }
 
 /*
···
 }
 
 /*
+ * 3.3.19  FSINFO3res
+ *
+ *	struct FSINFO3resok {
+ *		post_op_attr	obj_attributes;
+ *		uint32		rtmax;
+ *		uint32		rtpref;
+ *		uint32		rtmult;
+ *		uint32		wtmax;
+ *		uint32		wtpref;
+ *		uint32		wtmult;
+ *		uint32		dtpref;
+ *		size3		maxfilesize;
+ *		nfstime3	time_delta;
+ *		uint32		properties;
+ *	};
+ *
+ *	struct FSINFO3resfail {
+ *		post_op_attr	obj_attributes;
+ *	};
+ *
+ *	union FSINFO3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		FSINFO3resok	resok;
+ *	default:
+ *		FSINFO3resfail	resfail;
+ *	};
+ */
+static int decode_fsinfo3resok(struct xdr_stream *xdr,
+			       struct nfs_fsinfo *result)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	result->rtmax  = be32_to_cpup(p++);
+	result->rtpref = be32_to_cpup(p++);
+	result->rtmult = be32_to_cpup(p++);
+	result->wtmax  = be32_to_cpup(p++);
+	result->wtpref = be32_to_cpup(p++);
+	result->wtmult = be32_to_cpup(p++);
+	result->dtpref = be32_to_cpup(p++);
+	p = xdr_decode_size3(p, &result->maxfilesize);
+	xdr_decode_time3(p, &result->time_delta);
+
+	/* ignore properties */
+	result->lease_time = 0;
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req, __be32 *p,
+				   struct nfs_fsinfo *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	error = decode_post_op_attr(&xdr, result->fattr);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_status;
+	error = decode_fsinfo3resok(&xdr, result);
+out:
+	return error;
+out_status:
+	return nfs_stat_to_errno(status);
+}
+
+/*
  * Decode PATHCONF reply
  */
 static int
···
 }
 
 /*
+ * 3.3.20  PATHCONF3res
+ *
+ *	struct PATHCONF3resok {
+ *		post_op_attr	obj_attributes;
+ *		uint32		linkmax;
+ *		uint32		name_max;
+ *		bool		no_trunc;
+ *		bool		chown_restricted;
+ *		bool		case_insensitive;
+ *		bool		case_preserving;
+ *	};
+ *
+ *	struct PATHCONF3resfail {
+ *		post_op_attr	obj_attributes;
+ *	};
+ *
+ *	union PATHCONF3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		PATHCONF3resok	resok;
+ *	default:
+ *		PATHCONF3resfail resfail;
+ *	};
+ */
+static int decode_pathconf3resok(struct xdr_stream *xdr,
+				 struct nfs_pathconf *result)
+{
+	__be32 *p;
+
+	p = xdr_inline_decode(xdr, 4 * 6);
+	if (unlikely(p == NULL))
+		goto out_overflow;
+	result->max_link = be32_to_cpup(p++);
+	result->max_namelen = be32_to_cpup(p);
+	/* ignore remaining fields */
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
+
+static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req, __be32 *p,
+				     struct nfs_pathconf *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	error = decode_post_op_attr(&xdr, result->fattr);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_status;
+	error = decode_pathconf3resok(&xdr, result);
+out:
+	return error;
+out_status:
+	return nfs_stat_to_errno(status);
+}
+
+/*
  * Decode COMMIT reply
  */
 static int
···
 	res->verf->verifier[0] = *p++;
 	res->verf->verifier[1] = *p++;
 	return 0;
+}
+
+/*
+ * 3.3.21  COMMIT3res
+ *
+ *	struct COMMIT3resok {
+ *		wcc_data	file_wcc;
+ *		writeverf3	verf;
+ *	};
+ *
+ *	struct COMMIT3resfail {
+ *		wcc_data	file_wcc;
+ *	};
+ *
+ *	union COMMIT3res switch (nfsstat3 status) {
+ *	case NFS3_OK:
+ *		COMMIT3resok	resok;
+ *	default:
+ *		COMMIT3resfail	resfail;
+ *	};
+ */
+static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req, __be32 *p,
+				   struct nfs_writeres *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	error = decode_wcc_data(&xdr, result->fattr);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_status;
+	error = decode_writeverf3(&xdr, result->verf->verifier);
+out:
+	return error;
+out_status:
+	return nfs_stat_to_errno(status);
 }
 
 #ifdef CONFIG_NFS_V3_ACL
···
 	return (err > 0) ? 0 : err;
 }
 
+static inline int decode_getacl3resok(struct xdr_stream *xdr,
+				      struct nfs3_getaclres *result)
+{
+	struct posix_acl **acl;
+	unsigned int *aclcnt;
+	size_t hdrlen;
+	int error;
+
+	error = decode_post_op_attr(xdr, result->fattr);
+	if (unlikely(error))
+		goto out;
+	error = decode_uint32(xdr, &result->mask);
+	if (unlikely(error))
+		goto out;
+	error = -EINVAL;
+	if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
+		goto out;
+
+	hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
+
+	acl = NULL;
+	if (result->mask & NFS_ACL)
+		acl = &result->acl_access;
+	aclcnt = NULL;
+	if (result->mask & NFS_ACLCNT)
+		aclcnt = &result->acl_access_count;
+	error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
+	if (unlikely(error <= 0))
+		goto out;
+
+	acl = NULL;
+	if (result->mask & NFS_DFACL)
+		acl = &result->acl_default;
+	aclcnt = NULL;
+	if (result->mask & NFS_DFACLCNT)
+		aclcnt = &result->acl_default_count;
+	error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
+	if (unlikely(error <= 0))
+		return error;
+	error = 0;
+out:
+	return error;
+}
+
+static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req, __be32 *p,
+				   struct nfs3_getaclres *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_default;
+	error = decode_getacl3resok(&xdr, result);
+out:
+	return error;
+out_default:
+	return nfs_stat_to_errno(status);
+}
+
 /*
  * Decode setacl reply.
  */
···
 	xdr_decode_post_op_attr(p, fattr);
 	return 0;
 }
+
+static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req, __be32 *p,
+				   struct nfs_fattr *result)
+{
+	struct xdr_stream xdr;
+	enum nfs_stat status;
+	int error;
+
+	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+	error = decode_nfsstat3(&xdr, &status);
+	if (unlikely(error))
+		goto out;
+	if (status != NFS3_OK)
+		goto out_default;
+	error = decode_post_op_attr(&xdr, result);
+out:
+	return error;
+out_default:
+	return nfs_stat_to_errno(status);
+}
+
 #endif  /* CONFIG_NFS_V3_ACL */
 
 #define PROC(proc, argtype, restype, timer)				\

include/linux/nfs3.h

···
 #define NFS3_COOKIESIZE		4
 #define NFS3_CREATEVERFSIZE	8
 #define NFS3_COOKIEVERFSIZE	8
+#define NFS3_WRITEVERFSIZE	8
 #define NFS3_FIFO_DEV		(-1)
 #define NFS3MODE_FMT		0170000
 #define NFS3MODE_DIR		0040000