diff options
Diffstat (limited to 'include/sys/zfs_refcount.h')
| -rw-r--r-- | include/sys/zfs_refcount.h | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/include/sys/zfs_refcount.h b/include/sys/zfs_refcount.h deleted file mode 100644 index 5cf1723d8091..000000000000 --- a/include/sys/zfs_refcount.h +++ /dev/null @@ -1,145 +0,0 @@ -// 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) 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/avl.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 { - union { - avl_node_t a; - list_node_t l; - } ref_link; - const void *ref_holder; - uint64_t ref_number; - boolean_t ref_search; -} reference_t; - -typedef struct refcount { - uint64_t rc_count; - kmutex_t rc_mtx; - avl_tree_t rc_tree; - list_t rc_removed; - uint_t rc_removed_count; - boolean_t rc_tracked; -} 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 *); -/* - * Note that (add|remove)_many adds/removes one reference with "number" N, - * _not_ N references with "number" 1, which is what (add|remove)_few does, - * or what vanilla zfs_refcount_(add|remove) called N times would do. - * - * Attempting to remove a reference with number N when none exists is a - * panic on debug kernels with reference_tracking enabled. - */ -void zfs_refcount_add_few(zfs_refcount_t *, uint64_t, const void *); -void zfs_refcount_remove_few(zfs_refcount_t *, uint64_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) (zfs_refcount_count(rc) == 0) -#define zfs_refcount_count(rc) atomic_load_64(&(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_few(rc, number, holder) \ - atomic_add_64(&(rc)->rc_count, number) -#define zfs_refcount_remove_few(rc, number, holder) \ - atomic_add_64(&(rc)->rc_count, -number) -#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 = zfs_refcount_count(src); \ - 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) (zfs_refcount_count(rc) > 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 */ |