Rename refcount.h to zfs_refcount.h

Renamed to avoid conflicting with refcount.h when a different
implementation is already provided by the platform.

Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Closes #10620

include/sys/zfs_refcount.h

@@ -0,0 +1,126 @@
+/*
+ * 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 http://www.opensolaris.org/os/licensing.
+ * 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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2015 by Delphix. All rights reserved.
+ */
+
+#ifndef	_SYS_ZFS_REFCOUNT_H
+#define	_SYS_ZFS_REFCOUNT_H
+
+#include <sys/inttypes.h>
+#include <sys/list.h>
+#include <sys/zfs_context.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+ * If the reference is held only by the calling function and not any
+ * particular object, use FTAG (which is a string) for the holder_tag.
+ * Otherwise, use the object that holds the reference.
+ */
+#define	FTAG ((char *)(uintptr_t)__func__)
+
+#ifdef	ZFS_DEBUG
+typedef struct reference {
+	list_node_t ref_link;
+	const void *ref_holder;
+	uint64_t ref_number;
+	uint8_t *ref_removed;
+} reference_t;
+
+typedef struct refcount {
+	kmutex_t rc_mtx;
+	boolean_t rc_tracked;
+	list_t rc_list;
+	list_t rc_removed;
+	uint64_t rc_count;
+	uint64_t rc_removed_count;
+} zfs_refcount_t;
+
+/*
+ * Note: zfs_refcount_t must be initialized with
+ * refcount_create[_untracked]()
+ */
+
+void zfs_refcount_create(zfs_refcount_t *);
+void zfs_refcount_create_untracked(zfs_refcount_t *);
+void zfs_refcount_create_tracked(zfs_refcount_t *);
+void zfs_refcount_destroy(zfs_refcount_t *);
+void zfs_refcount_destroy_many(zfs_refcount_t *, uint64_t);
+int zfs_refcount_is_zero(zfs_refcount_t *);
+int64_t zfs_refcount_count(zfs_refcount_t *);
+int64_t zfs_refcount_add(zfs_refcount_t *, const void *);
+int64_t zfs_refcount_remove(zfs_refcount_t *, const void *);
+int64_t zfs_refcount_add_many(zfs_refcount_t *, uint64_t, const void *);
+int64_t zfs_refcount_remove_many(zfs_refcount_t *, uint64_t, const void *);
+void zfs_refcount_transfer(zfs_refcount_t *, zfs_refcount_t *);
+void zfs_refcount_transfer_ownership(zfs_refcount_t *, const void *,
+    const void *);
+void zfs_refcount_transfer_ownership_many(zfs_refcount_t *, uint64_t,
+    const void *, const void *);
+boolean_t zfs_refcount_held(zfs_refcount_t *, const void *);
+boolean_t zfs_refcount_not_held(zfs_refcount_t *, const void *);
+
+void zfs_refcount_init(void);
+void zfs_refcount_fini(void);
+
+#else	/* ZFS_DEBUG */
+
+typedef struct refcount {
+	uint64_t rc_count;
+} zfs_refcount_t;
+
+#define	zfs_refcount_create(rc) ((rc)->rc_count = 0)
+#define	zfs_refcount_create_untracked(rc) ((rc)->rc_count = 0)
+#define	zfs_refcount_create_tracked(rc) ((rc)->rc_count = 0)
+#define	zfs_refcount_destroy(rc) ((rc)->rc_count = 0)
+#define	zfs_refcount_destroy_many(rc, number) ((rc)->rc_count = 0)
+#define	zfs_refcount_is_zero(rc) ((rc)->rc_count == 0)
+#define	zfs_refcount_count(rc) ((rc)->rc_count)
+#define	zfs_refcount_add(rc, holder) atomic_inc_64_nv(&(rc)->rc_count)
+#define	zfs_refcount_remove(rc, holder) atomic_dec_64_nv(&(rc)->rc_count)
+#define	zfs_refcount_add_many(rc, number, holder) \
+	atomic_add_64_nv(&(rc)->rc_count, number)
+#define	zfs_refcount_remove_many(rc, number, holder) \
+	atomic_add_64_nv(&(rc)->rc_count, -number)
+#define	zfs_refcount_transfer(dst, src) { \
+	uint64_t __tmp = (src)->rc_count; \
+	atomic_add_64(&(src)->rc_count, -__tmp); \
+	atomic_add_64(&(dst)->rc_count, __tmp); \
+}
+#define	zfs_refcount_transfer_ownership(rc, ch, nh)		((void)0)
+#define	zfs_refcount_transfer_ownership_many(rc, nr, ch, nh)	((void)0)
+#define	zfs_refcount_held(rc, holder)			((rc)->rc_count > 0)
+#define	zfs_refcount_not_held(rc, holder)		(B_TRUE)
+
+#define	zfs_refcount_init()
+#define	zfs_refcount_fini()
+
+#endif	/* ZFS_DEBUG */
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* _SYS_REFCOUNT_H */