1 /* user_defined.c: user defined key type
17 #include <keys/user-type.h>
24  * user defined keys take an arbitrary string as the description and an
28 	.name			= "user",
61  * Preparse a user defined key payload
66 	size_t datalen = prep->datalen;  in user_preparse()
68 	if (datalen <= 0 || datalen > 32767 || !prep->data)  in user_preparse()
69 		return -EINVAL;  in user_preparse()
73 		return -ENOMEM;  in user_preparse()
76 	prep->quotalen = datalen;  in user_preparse()
77 	prep->payload.data[0] = upayload;  in user_preparse()
78 	upayload->datalen = datalen;  in user_preparse()
79 	memcpy(upayload->data, prep->data, datalen);  in user_preparse()
85  * Free a preparse of a user defined key payload
89 	kzfree(prep->payload.data[0]);  in user_free_preparse()
102  * update a user defined key
103  * - the key's semaphore is write-locked
111 	ret = key_payload_reserve(key, prep->datalen);  in user_update()
116 	key->expiry = prep->expiry;  in user_update()
119 	rcu_assign_keypointer(key, prep->payload.data[0]);  in user_update()
120 	prep->payload.data[0] = NULL;  in user_update()
123 		call_rcu(&zap->rcu, user_free_payload_rcu);  in user_update()
130  * - called with the key sem write-locked
141 		call_rcu(&upayload->rcu, user_free_payload_rcu);  in user_revoke()
148  * dispose of the data dangling from the corpse of a user key
152 	struct user_key_payload *upayload = key->payload.data[0];  in user_destroy()
160  * describe the user key
164 	seq_puts(m, key->description);  in user_describe()
166 		seq_printf(m, ": %u", key->datalen);  in user_describe()
173  * - the key's semaphore is read-locked
181 	ret = upayload->datalen;  in user_read()
185 		if (buflen > upayload->datalen)  in user_read()
186 			buflen = upayload->datalen;  in user_read()
188 		memcpy(buffer, upayload->data, buflen);  in user_read()
204 		return -EINVAL;  in logon_vet_description()
208 		return -EINVAL;  in logon_vet_description()