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1 | /* | |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. | |
23 | * Copyright (c) 2012, 2015 by Delphix. All rights reserved. | |
24 | */ | |
25 | ||
26 | #ifndef _SYS_REFCOUNT_H | |
27 | #define _SYS_REFCOUNT_H | |
28 | ||
29 | #include <sys/inttypes.h> | |
30 | #include <sys/list.h> | |
31 | #include <sys/zfs_context.h> | |
32 | ||
33 | #ifdef __cplusplus | |
34 | extern "C" { | |
35 | #endif | |
36 | ||
37 | /* | |
38 | * If the reference is held only by the calling function and not any | |
39 | * particular object, use FTAG (which is a string) for the holder_tag. | |
40 | * Otherwise, use the object that holds the reference. | |
41 | */ | |
42 | #define FTAG ((char *)(uintptr_t)__func__) | |
43 | ||
44 | #ifdef ZFS_DEBUG | |
45 | typedef struct reference { | |
46 | list_node_t ref_link; | |
47 | void *ref_holder; | |
48 | uint64_t ref_number; | |
49 | uint8_t *ref_removed; | |
50 | } reference_t; | |
51 | ||
52 | typedef struct refcount { | |
53 | kmutex_t rc_mtx; | |
54 | boolean_t rc_tracked; | |
55 | list_t rc_list; | |
56 | list_t rc_removed; | |
57 | uint64_t rc_count; | |
58 | uint64_t rc_removed_count; | |
59 | } zfs_refcount_t; | |
60 | ||
61 | /* | |
62 | * Note: zfs_refcount_t must be initialized with | |
63 | * refcount_create[_untracked]() | |
64 | */ | |
65 | ||
66 | void zfs_refcount_create(zfs_refcount_t *); | |
67 | void zfs_refcount_create_untracked(zfs_refcount_t *); | |
68 | void zfs_refcount_create_tracked(zfs_refcount_t *); | |
69 | void zfs_refcount_destroy(zfs_refcount_t *); | |
70 | void zfs_refcount_destroy_many(zfs_refcount_t *, uint64_t); | |
71 | int zfs_refcount_is_zero(zfs_refcount_t *); | |
72 | int64_t zfs_refcount_count(zfs_refcount_t *); | |
73 | int64_t zfs_refcount_add(zfs_refcount_t *, void *); | |
74 | int64_t zfs_refcount_remove(zfs_refcount_t *, void *); | |
75 | int64_t zfs_refcount_add_many(zfs_refcount_t *, uint64_t, void *); | |
76 | int64_t zfs_refcount_remove_many(zfs_refcount_t *, uint64_t, void *); | |
77 | void zfs_refcount_transfer(zfs_refcount_t *, zfs_refcount_t *); | |
78 | void zfs_refcount_transfer_ownership(zfs_refcount_t *, void *, void *); | |
79 | void zfs_refcount_transfer_ownership_many(zfs_refcount_t *, uint64_t, | |
80 | void *, void *); | |
81 | boolean_t zfs_refcount_held(zfs_refcount_t *, void *); | |
82 | boolean_t zfs_refcount_not_held(zfs_refcount_t *, void *); | |
83 | ||
84 | void zfs_refcount_init(void); | |
85 | void zfs_refcount_fini(void); | |
86 | ||
87 | #else /* ZFS_DEBUG */ | |
88 | ||
89 | typedef struct refcount { | |
90 | uint64_t rc_count; | |
91 | } zfs_refcount_t; | |
92 | ||
93 | #define zfs_refcount_create(rc) ((rc)->rc_count = 0) | |
94 | #define zfs_refcount_create_untracked(rc) ((rc)->rc_count = 0) | |
95 | #define zfs_refcount_create_tracked(rc) ((rc)->rc_count = 0) | |
96 | #define zfs_refcount_destroy(rc) ((rc)->rc_count = 0) | |
97 | #define zfs_refcount_destroy_many(rc, number) ((rc)->rc_count = 0) | |
98 | #define zfs_refcount_is_zero(rc) ((rc)->rc_count == 0) | |
99 | #define zfs_refcount_count(rc) ((rc)->rc_count) | |
100 | #define zfs_refcount_add(rc, holder) atomic_inc_64_nv(&(rc)->rc_count) | |
101 | #define zfs_refcount_remove(rc, holder) atomic_dec_64_nv(&(rc)->rc_count) | |
102 | #define zfs_refcount_add_many(rc, number, holder) \ | |
103 | atomic_add_64_nv(&(rc)->rc_count, number) | |
104 | #define zfs_refcount_remove_many(rc, number, holder) \ | |
105 | atomic_add_64_nv(&(rc)->rc_count, -number) | |
106 | #define zfs_refcount_transfer(dst, src) { \ | |
107 | uint64_t __tmp = (src)->rc_count; \ | |
108 | atomic_add_64(&(src)->rc_count, -__tmp); \ | |
109 | atomic_add_64(&(dst)->rc_count, __tmp); \ | |
110 | } | |
111 | #define zfs_refcount_transfer_ownership(rc, ch, nh) ((void)0) | |
112 | #define zfs_refcount_transfer_ownership_many(rc, nr, ch, nh) ((void)0) | |
113 | #define zfs_refcount_held(rc, holder) ((rc)->rc_count > 0) | |
114 | #define zfs_refcount_not_held(rc, holder) (B_TRUE) | |
115 | ||
116 | #define zfs_refcount_init() | |
117 | #define zfs_refcount_fini() | |
118 | ||
119 | #endif /* ZFS_DEBUG */ | |
120 | ||
121 | #ifdef __cplusplus | |
122 | } | |
123 | #endif | |
124 | ||
125 | #endif /* _SYS_REFCOUNT_H */ |