1 files changed, 61 insertions, 0 deletions
diff --git a/usr/src/uts/common/sys/refhash.h b/usr/src/uts/common/sys/refhash.h
new file mode 100644
index 0000000000..b7427a454d
--- /dev/null
+++ b/usr/src/uts/common/sys/refhash.h
@@ -0,0 +1,61 @@
+/*
+ * This file and its contents are supplied under the terms of the
+ * Common Development and Distribution License ("CDDL"), version 1.0.
+ * You may only use this file in accordance with the terms of version
+ * 1.0 of the CDDL.
+ *
+ * A full copy of the text of the CDDL should have accompanied this
+ * source.  A copy of the CDDL is also available via the Internet at
+ * http://www.illumos.org/license/CDDL.
+ */
+
+/*
+ * Copyright 2015 Joyent, Inc.
+ */
+
+#ifndef	_SYS_REFHASH_H
+#define	_SYS_REFHASH_H
+
+#include <sys/types.h>
+#include <sys/list.h>
+
+#define	RHL_F_DEAD	0x01
+
+typedef struct refhash_link {
+	list_node_t rhl_chain_link;
+	list_node_t rhl_global_link;
+	uint_t rhl_flags;
+	uint_t rhl_refcnt;
+} refhash_link_t;
+
+typedef uint64_t (*refhash_hash_f)(const void *);
+typedef int (*refhash_cmp_f)(const void *, const void *);
+typedef void (*refhash_dtor_f)(void *);
+typedef int (*refhash_eval_f)(const void *, void *);
+
+typedef struct refhash {
+	list_t *rh_buckets;
+	uint_t rh_bucket_count;
+	list_t rh_objs;
+	size_t rh_obj_size;	/* used by mdb */
+	size_t rh_link_off;
+	size_t rh_tag_off;
+	refhash_hash_f rh_hash;
+	refhash_cmp_f rh_cmp;
+	refhash_dtor_f rh_dtor;
+} refhash_t;
+
+extern refhash_t *refhash_create(uint_t, refhash_hash_f, refhash_cmp_f,
+    refhash_dtor_f, size_t, size_t, size_t, int);
+extern void refhash_destroy(refhash_t *);
+extern void refhash_insert(refhash_t *, void *);
+extern void refhash_remove(refhash_t *, void *);
+extern void *refhash_lookup(refhash_t *, const void *);
+extern void *refhash_linear_search(refhash_t *, refhash_eval_f, void *);
+extern void refhash_hold(refhash_t *, void *);
+extern void refhash_rele(refhash_t *, void *);
+extern void *refhash_first(refhash_t *);
+extern void *refhash_next(refhash_t *, void *);
+extern boolean_t refhash_obj_valid(refhash_t *hp, const void *);
+
+#endif	/* _SYS_REFHASH_H */