1 files changed, 75 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/include/zfs_crrd.h b/sys/contrib/openzfs/include/zfs_crrd.h
new file mode 100644
index 000000000000..ba192a2062ea
--- /dev/null
+++ b/sys/contrib/openzfs/include/zfs_crrd.h
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: CDDL-1.0
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or https://opensource.org/licenses/CDDL-1.0.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2024 Klara Inc.
+ *
+ * This software was developed by
+ * Mariusz Zaborski <mariusz.zaborski@klarasystems.com>
+ * Fred Weigel <fred.weigel@klarasystems.com>
+ * under sponsorship from Wasabi Technology, Inc. and Klara Inc.
+ */
+
+#ifndef _CRRD_H_
+#define	_CRRD_H_
+
+#define	RRD_MAX_ENTRIES	256
+
+#define	RRD_ENTRY_SIZE	sizeof (uint64_t)
+#define	RRD_STRUCT_ELEM	(sizeof (rrd_t) / RRD_ENTRY_SIZE)
+
+typedef enum {
+	DBRRD_FLOOR,
+	DBRRD_CEILING
+} dbrrd_rounding_t;
+
+typedef struct {
+	uint64_t	rrdd_time;
+	uint64_t	rrdd_txg;
+} rrd_data_t;
+
+typedef struct {
+	uint64_t	rrd_head;	/* head (beginning) */
+	uint64_t	rrd_tail;	/* tail (end) */
+	uint64_t	rrd_length;
+
+	rrd_data_t	rrd_entries[RRD_MAX_ENTRIES];
+} rrd_t;
+
+typedef struct {
+	rrd_t		dbr_minutes;
+	rrd_t		dbr_days;
+	rrd_t		dbr_months;
+} dbrrd_t;
+
+size_t rrd_len(rrd_t *rrd);
+
+const rrd_data_t *rrd_entry(rrd_t *r, size_t i);
+rrd_data_t *rrd_tail_entry(rrd_t *rrd);
+uint64_t rrd_tail(rrd_t *rrd);
+uint64_t rrd_get(rrd_t *rrd, size_t i);
+
+void rrd_add(rrd_t *rrd, hrtime_t time, uint64_t txg);
+
+void dbrrd_add(dbrrd_t *db, hrtime_t time, uint64_t txg);
+uint64_t dbrrd_query(dbrrd_t *r, hrtime_t tv, dbrrd_rounding_t rouding);
+
+#endif