v4.19.13 snapshot.
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
new file mode 100644
index 0000000..6dad031
--- /dev/null
+++ b/include/linux/xattr.h
@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ File: linux/xattr.h
+
+ Extended attributes handling.
+
+ Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
+ Copyright (c) 2001-2002 Silicon Graphics, Inc. All Rights Reserved.
+ Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
+*/
+#ifndef _LINUX_XATTR_H
+#define _LINUX_XATTR_H
+
+
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <uapi/linux/xattr.h>
+
+struct inode;
+struct dentry;
+
+/*
+ * struct xattr_handler: When @name is set, match attributes with exactly that
+ * name. When @prefix is set instead, match attributes with that prefix and
+ * with a non-empty suffix.
+ */
+struct xattr_handler {
+ const char *name;
+ const char *prefix;
+ int flags; /* fs private flags */
+ bool (*list)(struct dentry *dentry);
+ int (*get)(const struct xattr_handler *, struct dentry *dentry,
+ struct inode *inode, const char *name, void *buffer,
+ size_t size);
+ int (*set)(const struct xattr_handler *, struct dentry *dentry,
+ struct inode *inode, const char *name, const void *buffer,
+ size_t size, int flags);
+};
+
+const char *xattr_full_name(const struct xattr_handler *, const char *);
+
+struct xattr {
+ const char *name;
+ void *value;
+ size_t value_len;
+};
+
+ssize_t __vfs_getxattr(struct dentry *, struct inode *, const char *, void *, size_t);
+ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
+ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
+int __vfs_setxattr(struct dentry *, struct inode *, const char *, const void *, size_t, int);
+int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
+int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
+int __vfs_removexattr(struct dentry *, const char *);
+int vfs_removexattr(struct dentry *, const char *);
+
+ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
+ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
+ char **xattr_value, size_t size, gfp_t flags);
+
+static inline const char *xattr_prefix(const struct xattr_handler *handler)
+{
+ return handler->prefix ?: handler->name;
+}
+
+struct simple_xattrs {
+ struct list_head head;
+ spinlock_t lock;
+};
+
+struct simple_xattr {
+ struct list_head list;
+ char *name;
+ size_t size;
+ char value[0];
+};
+
+/*
+ * initialize the simple_xattrs structure
+ */
+static inline void simple_xattrs_init(struct simple_xattrs *xattrs)
+{
+ INIT_LIST_HEAD(&xattrs->head);
+ spin_lock_init(&xattrs->lock);
+}
+
+/*
+ * free all the xattrs
+ */
+static inline void simple_xattrs_free(struct simple_xattrs *xattrs)
+{
+ struct simple_xattr *xattr, *node;
+
+ list_for_each_entry_safe(xattr, node, &xattrs->head, list) {
+ kfree(xattr->name);
+ kfree(xattr);
+ }
+}
+
+struct simple_xattr *simple_xattr_alloc(const void *value, size_t size);
+int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
+ void *buffer, size_t size);
+int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
+ const void *value, size_t size, int flags);
+ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs, char *buffer,
+ size_t size);
+void simple_xattr_list_add(struct simple_xattrs *xattrs,
+ struct simple_xattr *new_xattr);
+
+#endif /* _LINUX_XATTR_H */