1 files changed, 67 insertions, 0 deletions
diff --git a/include/linux/posix_acl_xattr.h b/include/linux/posix_acl_xattr.h
new file mode 100644
index 000000000..8163dd48c
--- /dev/null
+++ b/include/linux/posix_acl_xattr.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+  File: linux/posix_acl_xattr.h
+
+  Extended attribute system call representation of Access Control Lists.
+
+  Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org>
+  Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
+ */
+#ifndef _POSIX_ACL_XATTR_H
+#define _POSIX_ACL_XATTR_H
+
+#include <uapi/linux/xattr.h>
+#include <uapi/linux/posix_acl_xattr.h>
+#include <linux/posix_acl.h>
+
+static inline size_t
+posix_acl_xattr_size(int count)
+{
+	return (sizeof(struct posix_acl_xattr_header) +
+		(count * sizeof(struct posix_acl_xattr_entry)));
+}
+
+static inline int
+posix_acl_xattr_count(size_t size)
+{
+	if (size < sizeof(struct posix_acl_xattr_header))
+		return -1;
+	size -= sizeof(struct posix_acl_xattr_header);
+	if (size % sizeof(struct posix_acl_xattr_entry))
+		return -1;
+	return size / sizeof(struct posix_acl_xattr_entry);
+}
+
+#ifdef CONFIG_FS_POSIX_ACL
+void posix_acl_fix_xattr_from_user(void *value, size_t size);
+void posix_acl_fix_xattr_to_user(void *value, size_t size);
+void posix_acl_getxattr_idmapped_mnt(struct user_namespace *mnt_userns,
+				     const struct inode *inode,
+				     void *value, size_t size);
+#else
+static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
+{
+}
+static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
+{
+}
+static inline void
+posix_acl_getxattr_idmapped_mnt(struct user_namespace *mnt_userns,
+				const struct inode *inode, void *value,
+				size_t size)
+{
+}
+#endif
+
+struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, 
+				       const void *value, size_t size);
+int posix_acl_to_xattr(struct user_namespace *user_ns,
+		       const struct posix_acl *acl, void *buffer, size_t size);
+struct posix_acl *vfs_set_acl_prepare(struct user_namespace *mnt_userns,
+				      struct user_namespace *fs_userns,
+				      const void *value, size_t size);
+
+extern const struct xattr_handler posix_acl_access_xattr_handler;
+extern const struct xattr_handler posix_acl_default_xattr_handler;
+
+#endif	/* _POSIX_ACL_XATTR_H */