diff options
Diffstat (limited to 'net/tipc/ref.h')
| -rw-r--r-- | net/tipc/ref.h | 89 |
1 files changed, 4 insertions, 85 deletions
diff --git a/net/tipc/ref.h b/net/tipc/ref.h index 38f3a7f4a78d..7e3798ea93b9 100644 --- a/net/tipc/ref.h +++ b/net/tipc/ref.h | |||
| @@ -2,7 +2,7 @@ | |||
| 2 | * net/tipc/ref.h: Include file for TIPC object registry code | 2 | * net/tipc/ref.h: Include file for TIPC object registry code |
| 3 | * | 3 | * |
| 4 | * Copyright (c) 1991-2006, Ericsson AB | 4 | * Copyright (c) 1991-2006, Ericsson AB |
| 5 | * Copyright (c) 2005, Wind River Systems | 5 | * Copyright (c) 2005-2006, Wind River Systems |
| 6 | * All rights reserved. | 6 | * All rights reserved. |
| 7 | * | 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without | 8 | * Redistribution and use in source and binary forms, with or without |
| @@ -37,95 +37,14 @@ | |||
| 37 | #ifndef _TIPC_REF_H | 37 | #ifndef _TIPC_REF_H |
| 38 | #define _TIPC_REF_H | 38 | #define _TIPC_REF_H |
| 39 | 39 | ||
| 40 | /** | ||
| 41 | * struct reference - TIPC object reference entry | ||
| 42 | * @object: pointer to object associated with reference entry | ||
| 43 | * @lock: spinlock controlling access to object | ||
| 44 | * @data: reference value associated with object (or link to next unused entry) | ||
| 45 | */ | ||
| 46 | |||
| 47 | struct reference { | ||
| 48 | void *object; | ||
| 49 | spinlock_t lock; | ||
| 50 | union { | ||
| 51 | u32 next_plus_upper; | ||
| 52 | u32 reference; | ||
| 53 | } data; | ||
| 54 | }; | ||
| 55 | |||
| 56 | /** | ||
| 57 | * struct tipc_ref_table - table of TIPC object reference entries | ||
| 58 | * @entries: pointer to array of reference entries | ||
| 59 | * @index_mask: bitmask for array index portion of reference values | ||
| 60 | * @first_free: array index of first unused object reference entry | ||
| 61 | * @last_free: array index of last unused object reference entry | ||
| 62 | */ | ||
| 63 | |||
| 64 | struct ref_table { | ||
| 65 | struct reference *entries; | ||
| 66 | u32 index_mask; | ||
| 67 | u32 first_free; | ||
| 68 | u32 last_free; | ||
| 69 | }; | ||
| 70 | |||
| 71 | extern struct ref_table tipc_ref_table; | ||
| 72 | |||
| 73 | int tipc_ref_table_init(u32 requested_size, u32 start); | 40 | int tipc_ref_table_init(u32 requested_size, u32 start); |
| 74 | void tipc_ref_table_stop(void); | 41 | void tipc_ref_table_stop(void); |
| 75 | 42 | ||
| 76 | u32 tipc_ref_acquire(void *object, spinlock_t **lock); | 43 | u32 tipc_ref_acquire(void *object, spinlock_t **lock); |
| 77 | void tipc_ref_discard(u32 ref); | 44 | void tipc_ref_discard(u32 ref); |
| 78 | 45 | ||
| 79 | 46 | void *tipc_ref_lock(u32 ref); | |
| 80 | /** | 47 | void tipc_ref_unlock(u32 ref); |
| 81 | * tipc_ref_lock - lock referenced object and return pointer to it | 48 | void *tipc_ref_deref(u32 ref); |
| 82 | */ | ||
| 83 | |||
| 84 | static inline void *tipc_ref_lock(u32 ref) | ||
| 85 | { | ||
| 86 | if (likely(tipc_ref_table.entries)) { | ||
| 87 | struct reference *r = | ||
| 88 | &tipc_ref_table.entries[ref & tipc_ref_table.index_mask]; | ||
| 89 | |||
| 90 | spin_lock_bh(&r->lock); | ||
| 91 | if (likely(r->data.reference == ref)) | ||
| 92 | return r->object; | ||
| 93 | spin_unlock_bh(&r->lock); | ||
| 94 | } | ||
| 95 | return NULL; | ||
| 96 | } | ||
| 97 | |||
| 98 | /** | ||
| 99 | * tipc_ref_unlock - unlock referenced object | ||
| 100 | */ | ||
| 101 | |||
| 102 | static inline void tipc_ref_unlock(u32 ref) | ||
| 103 | { | ||
| 104 | if (likely(tipc_ref_table.entries)) { | ||
| 105 | struct reference *r = | ||
| 106 | &tipc_ref_table.entries[ref & tipc_ref_table.index_mask]; | ||
| 107 | |||
| 108 | if (likely(r->data.reference == ref)) | ||
| 109 | spin_unlock_bh(&r->lock); | ||
| 110 | else | ||
| 111 | err("tipc_ref_unlock() invoked using obsolete reference\n"); | ||
| 112 | } | ||
| 113 | } | ||
| 114 | |||
| 115 | /** | ||
| 116 | * tipc_ref_deref - return pointer referenced object (without locking it) | ||
| 117 | */ | ||
| 118 | |||
| 119 | static inline void *tipc_ref_deref(u32 ref) | ||
| 120 | { | ||
| 121 | if (likely(tipc_ref_table.entries)) { | ||
| 122 | struct reference *r = | ||
| 123 | &tipc_ref_table.entries[ref & tipc_ref_table.index_mask]; | ||
| 124 | |||
| 125 | if (likely(r->data.reference == ref)) | ||
| 126 | return r->object; | ||
| 127 | } | ||
| 128 | return NULL; | ||
| 129 | } | ||
| 130 | 49 | ||
| 131 | #endif | 50 | #endif |
