diff options
Diffstat (limited to 'include/linux/key.h')
-rw-r--r-- | include/linux/key.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/include/linux/key.h b/include/linux/key.h new file mode 100644 index 00000000..cc6859a9 --- /dev/null +++ b/include/linux/key.h @@ -0,0 +1,42 @@ +#ifndef _LINUX_KEY_H +#define _LINUX_KEY_H + +#include <linux/types.h> +#include <linux/atomic.h> +#include <keyutils.h> + +struct user_key_payload { + size_t datalen; /* length of this data */ + char data[0]; /* actual data */ +}; + +struct key { + atomic_t usage; /* number of references */ + key_serial_t serial; /* key serial number */ + struct rw_semaphore sem; /* change vs change sem */ + struct user_key_payload payload; +}; + +static inline const struct user_key_payload *user_key_payload(const struct key *key) +{ + return &key->payload; +} + +static inline void key_put(struct key *key) +{ + if (atomic_dec_and_test(&key->usage)) + free(key); +} + +static inline struct key *__key_get(struct key *key) +{ + atomic_inc(&key->usage); + return key; +} + +static inline struct key *key_get(struct key *key) +{ + return key ? __key_get(key) : key; +} + +#endif /* _LINUX_KEY_H */ |