v4.19.13 snapshot.
diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
new file mode 100644
index 0000000..2584a5b
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_defer.h
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ */
+#ifndef __XFS_DEFER_H__
+#define __XFS_DEFER_H__
+
+struct xfs_defer_op_type;
+
+/*
+ * Save a log intent item and a list of extents, so that we can replay
+ * whatever action had to happen to the extent list and file the log done
+ * item.
+ */
+struct xfs_defer_pending {
+ const struct xfs_defer_op_type *dfp_type; /* function pointers */
+ struct list_head dfp_list; /* pending items */
+ void *dfp_intent; /* log intent item */
+ void *dfp_done; /* log done item */
+ struct list_head dfp_work; /* work items */
+ unsigned int dfp_count; /* # extent items */
+};
+
+/*
+ * Header for deferred operation list.
+ */
+enum xfs_defer_ops_type {
+ XFS_DEFER_OPS_TYPE_BMAP,
+ XFS_DEFER_OPS_TYPE_REFCOUNT,
+ XFS_DEFER_OPS_TYPE_RMAP,
+ XFS_DEFER_OPS_TYPE_FREE,
+ XFS_DEFER_OPS_TYPE_AGFL_FREE,
+ XFS_DEFER_OPS_TYPE_MAX,
+};
+
+void xfs_defer_add(struct xfs_trans *tp, enum xfs_defer_ops_type type,
+ struct list_head *h);
+int xfs_defer_finish_noroll(struct xfs_trans **tp);
+int xfs_defer_finish(struct xfs_trans **tp);
+void xfs_defer_cancel(struct xfs_trans *);
+void xfs_defer_move(struct xfs_trans *dtp, struct xfs_trans *stp);
+
+/* Description of a deferred type. */
+struct xfs_defer_op_type {
+ enum xfs_defer_ops_type type;
+ unsigned int max_items;
+ void (*abort_intent)(void *);
+ void *(*create_done)(struct xfs_trans *, void *, unsigned int);
+ int (*finish_item)(struct xfs_trans *, struct list_head *, void *,
+ void **);
+ void (*finish_cleanup)(struct xfs_trans *, void *, int);
+ void (*cancel_item)(struct list_head *);
+ int (*diff_items)(void *, struct list_head *, struct list_head *);
+ void *(*create_intent)(struct xfs_trans *, uint);
+ void (*log_item)(struct xfs_trans *, void *, struct list_head *);
+};
+
+void xfs_defer_init_op_type(const struct xfs_defer_op_type *type);
+
+#endif /* __XFS_DEFER_H__ */