Add RPC language definition of NFSv4 POSIX ACL extension

The language definition was extracted from the new
draft-ietf-nfsv4-posix-acls specification. This ensures good
constant and type name alignment between the spec and the Linux
kernel source code, and brings in some basic XDR utilities for
handling NFSv4 POSIX draft ACLs.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

2 files changed, 249 insertions, 2 deletions

diff --git a/fs/nfsd/nfs4xdr_gen.c b/fs/nfsd/nfs4xdr_gen.c
index ce5c36e9070a..824497051b87 100644
--- a/fs/nfsd/nfs4xdr_gen.c
+++ b/fs/nfsd/nfs4xdr_gen.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 // Generated by xdrgen. Manual edits will be lost.
 // XDR specification file: ../../Documentation/sunrpc/xdr/nfs4_1.x
-// XDR specification modification time: Thu Jan  8 23:11:48 2026
+// XDR specification modification time: Thu Jan  8 23:12:07 2026
 
 #include <linux/sunrpc/svc.h>
 
@@ -31,6 +31,30 @@ xdrgen_decode_bitmap4(struct xdr_stream *xdr, bitmap4 *ptr)
 }
 
 static bool __maybe_unused
+xdrgen_decode_utf8string(struct xdr_stream *xdr, utf8string *ptr)
+{
+	return xdrgen_decode_opaque(xdr, ptr, 0);
+}
+
+static bool __maybe_unused
+xdrgen_decode_utf8str_cis(struct xdr_stream *xdr, utf8str_cis *ptr)
+{
+	return xdrgen_decode_utf8string(xdr, ptr);
+}
+
+static bool __maybe_unused
+xdrgen_decode_utf8str_cs(struct xdr_stream *xdr, utf8str_cs *ptr)
+{
+	return xdrgen_decode_utf8string(xdr, ptr);
+}
+
+static bool __maybe_unused
+xdrgen_decode_utf8str_mixed(struct xdr_stream *xdr, utf8str_mixed *ptr)
+{
+	return xdrgen_decode_utf8string(xdr, ptr);
+}
+
+static bool __maybe_unused
 xdrgen_decode_nfstime4(struct xdr_stream *xdr, struct nfstime4 *ptr)
 {
 	if (!xdrgen_decode_int64_t(xdr, &ptr->seconds))
@@ -222,6 +246,125 @@ xdrgen_decode_open_delegation_type4(struct xdr_stream *xdr, open_delegation_type
 	return true;
 }
 
+bool
+xdrgen_decode_aclmodel4(struct xdr_stream *xdr, aclmodel4 *ptr)
+{
+	u32 val;
+
+	if (xdr_stream_decode_u32(xdr, &val) < 0)
+		return false;
+	/* Compiler may optimize to a range check for dense enums */
+	switch (val) {
+	case ACL_MODEL_NFS4:
+	case ACL_MODEL_POSIX_DRAFT:
+	case ACL_MODEL_NONE:
+		break;
+	default:
+		return false;
+	}
+	*ptr = val;
+	return true;
+}
+
+bool
+xdrgen_decode_aclscope4(struct xdr_stream *xdr, aclscope4 *ptr)
+{
+	u32 val;
+
+	if (xdr_stream_decode_u32(xdr, &val) < 0)
+		return false;
+	/* Compiler may optimize to a range check for dense enums */
+	switch (val) {
+	case ACL_SCOPE_FILE_OBJECT:
+	case ACL_SCOPE_FILE_SYSTEM:
+	case ACL_SCOPE_SERVER:
+		break;
+	default:
+		return false;
+	}
+	*ptr = val;
+	return true;
+}
+
+bool
+xdrgen_decode_posixacetag4(struct xdr_stream *xdr, posixacetag4 *ptr)
+{
+	u32 val;
+
+	if (xdr_stream_decode_u32(xdr, &val) < 0)
+		return false;
+	/* Compiler may optimize to a range check for dense enums */
+	switch (val) {
+	case POSIXACE4_TAG_USER_OBJ:
+	case POSIXACE4_TAG_USER:
+	case POSIXACE4_TAG_GROUP_OBJ:
+	case POSIXACE4_TAG_GROUP:
+	case POSIXACE4_TAG_MASK:
+	case POSIXACE4_TAG_OTHER:
+		break;
+	default:
+		return false;
+	}
+	*ptr = val;
+	return true;
+}
+
+bool
+xdrgen_decode_posixaceperm4(struct xdr_stream *xdr, posixaceperm4 *ptr)
+{
+	return xdrgen_decode_uint32_t(xdr, ptr);
+}
+
+static bool __maybe_unused
+xdrgen_decode_posixace4(struct xdr_stream *xdr, struct posixace4 *ptr)
+{
+	if (!xdrgen_decode_posixacetag4(xdr, &ptr->tag))
+		return false;
+	if (!xdrgen_decode_posixaceperm4(xdr, &ptr->perm))
+		return false;
+	if (!xdrgen_decode_utf8str_mixed(xdr, &ptr->who))
+		return false;
+	return true;
+}
+
+static bool __maybe_unused
+xdrgen_decode_fattr4_acl_trueform(struct xdr_stream *xdr, fattr4_acl_trueform *ptr)
+{
+	return xdrgen_decode_aclmodel4(xdr, ptr);
+}
+
+static bool __maybe_unused
+xdrgen_decode_fattr4_acl_trueform_scope(struct xdr_stream *xdr, fattr4_acl_trueform_scope *ptr)
+{
+	return xdrgen_decode_aclscope4(xdr, ptr);
+}
+
+static bool __maybe_unused
+xdrgen_decode_fattr4_posix_default_acl(struct xdr_stream *xdr, fattr4_posix_default_acl *ptr)
+{
+	if (xdr_stream_decode_u32(xdr, &ptr->count) < 0)
+		return false;
+	for (u32 i = 0; i < ptr->count; i++)
+		if (!xdrgen_decode_posixace4(xdr, &ptr->element[i]))
+			return false;
+	return true;
+}
+
+static bool __maybe_unused
+xdrgen_decode_fattr4_posix_access_acl(struct xdr_stream *xdr, fattr4_posix_access_acl *ptr)
+{
+	if (xdr_stream_decode_u32(xdr, &ptr->count) < 0)
+		return false;
+	for (u32 i = 0; i < ptr->count; i++)
+		if (!xdrgen_decode_posixace4(xdr, &ptr->element[i]))
+			return false;
+	return true;
+}
+
+/*
+ * New for POSIX ACL extension
+ */
+
 static bool __maybe_unused
 xdrgen_encode_int64_t(struct xdr_stream *xdr, const int64_t value)
 {
@@ -246,6 +389,30 @@ xdrgen_encode_bitmap4(struct xdr_stream *xdr, const bitmap4 value)
 }
 
 static bool __maybe_unused
+xdrgen_encode_utf8string(struct xdr_stream *xdr, const utf8string value)
+{
+	return xdr_stream_encode_opaque(xdr, value.data, value.len) >= 0;
+}
+
+static bool __maybe_unused
+xdrgen_encode_utf8str_cis(struct xdr_stream *xdr, const utf8str_cis value)
+{
+	return xdrgen_encode_utf8string(xdr, value);
+}
+
+static bool __maybe_unused
+xdrgen_encode_utf8str_cs(struct xdr_stream *xdr, const utf8str_cs value)
+{
+	return xdrgen_encode_utf8string(xdr, value);
+}
+
+static bool __maybe_unused
+xdrgen_encode_utf8str_mixed(struct xdr_stream *xdr, const utf8str_mixed value)
+{
+	return xdrgen_encode_utf8string(xdr, value);
+}
+
+static bool __maybe_unused
 xdrgen_encode_nfstime4(struct xdr_stream *xdr, const struct nfstime4 *value)
 {
 	if (!xdrgen_encode_int64_t(xdr, value->seconds))
@@ -330,3 +497,73 @@ xdrgen_encode_open_delegation_type4(struct xdr_stream *xdr, open_delegation_type
 {
 	return xdr_stream_encode_u32(xdr, value) == XDR_UNIT;
 }
+
+bool
+xdrgen_encode_aclmodel4(struct xdr_stream *xdr, aclmodel4 value)
+{
+	return xdr_stream_encode_u32(xdr, value) == XDR_UNIT;
+}
+
+bool
+xdrgen_encode_aclscope4(struct xdr_stream *xdr, aclscope4 value)
+{
+	return xdr_stream_encode_u32(xdr, value) == XDR_UNIT;
+}
+
+bool
+xdrgen_encode_posixacetag4(struct xdr_stream *xdr, posixacetag4 value)
+{
+	return xdr_stream_encode_u32(xdr, value) == XDR_UNIT;
+}
+
+bool
+xdrgen_encode_posixaceperm4(struct xdr_stream *xdr, const posixaceperm4 value)
+{
+	return xdrgen_encode_uint32_t(xdr, value);
+}
+
+static bool __maybe_unused
+xdrgen_encode_posixace4(struct xdr_stream *xdr, const struct posixace4 *value)
+{
+	if (!xdrgen_encode_posixacetag4(xdr, value->tag))
+		return false;
+	if (!xdrgen_encode_posixaceperm4(xdr, value->perm))
+		return false;
+	if (!xdrgen_encode_utf8str_mixed(xdr, value->who))
+		return false;
+	return true;
+}
+
+static bool __maybe_unused
+xdrgen_encode_fattr4_acl_trueform(struct xdr_stream *xdr, const fattr4_acl_trueform value)
+{
+	return xdrgen_encode_aclmodel4(xdr, value);
+}
+
+static bool __maybe_unused
+xdrgen_encode_fattr4_acl_trueform_scope(struct xdr_stream *xdr, const fattr4_acl_trueform_scope value)
+{
+	return xdrgen_encode_aclscope4(xdr, value);
+}
+
+static bool __maybe_unused
+xdrgen_encode_fattr4_posix_default_acl(struct xdr_stream *xdr, const fattr4_posix_default_acl value)
+{
+	if (xdr_stream_encode_u32(xdr, value.count) != XDR_UNIT)
+		return false;
+	for (u32 i = 0; i < value.count; i++)
+		if (!xdrgen_encode_posixace4(xdr, &value.element[i]))
+			return false;
+	return true;
+}
+
+static bool __maybe_unused
+xdrgen_encode_fattr4_posix_access_acl(struct xdr_stream *xdr, const fattr4_posix_access_acl value)
+{
+	if (xdr_stream_encode_u32(xdr, value.count) != XDR_UNIT)
+		return false;
+	for (u32 i = 0; i < value.count; i++)
+		if (!xdrgen_encode_posixace4(xdr, &value.element[i]))
+			return false;
+	return true;
+}
diff --git a/fs/nfsd/nfs4xdr_gen.h b/fs/nfsd/nfs4xdr_gen.h
index 8dfe10246506..1c487f1a11ab 100644
--- a/fs/nfsd/nfs4xdr_gen.h
+++ b/fs/nfsd/nfs4xdr_gen.h
@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /* Generated by xdrgen. Manual edits will be lost. */
 /* XDR specification file: ../../Documentation/sunrpc/xdr/nfs4_1.x */
-/* XDR specification modification time: Thu Jan  8 23:11:48 2026 */
+/* XDR specification modification time: Thu Jan  8 23:12:07 2026 */
 
 #ifndef _LINUX_XDRGEN_NFS4_1_DECL_H
 #define _LINUX_XDRGEN_NFS4_1_DECL_H
@@ -21,5 +21,15 @@ bool xdrgen_encode_fattr4_time_deleg_access(struct xdr_stream *xdr, const fattr4
 
 bool xdrgen_decode_fattr4_time_deleg_modify(struct xdr_stream *xdr, fattr4_time_deleg_modify *ptr);
 bool xdrgen_encode_fattr4_time_deleg_modify(struct xdr_stream *xdr, const fattr4_time_deleg_modify *value);
+bool xdrgen_decode_aclmodel4(struct xdr_stream *xdr, aclmodel4 *ptr);
+bool xdrgen_encode_aclmodel4(struct xdr_stream *xdr, aclmodel4 value);
+bool xdrgen_decode_aclscope4(struct xdr_stream *xdr, aclscope4 *ptr);
+bool xdrgen_encode_aclscope4(struct xdr_stream *xdr, aclscope4 value);
+bool xdrgen_decode_posixacetag4(struct xdr_stream *xdr, posixacetag4 *ptr);
+bool xdrgen_encode_posixacetag4(struct xdr_stream *xdr, posixacetag4 value);
+
+bool xdrgen_decode_posixaceperm4(struct xdr_stream *xdr, posixaceperm4 *ptr);
+bool xdrgen_encode_posixaceperm4(struct xdr_stream *xdr, const posixaceperm4 value);
+
 
 #endif /* _LINUX_XDRGEN_NFS4_1_DECL_H */