[AF_RXRPC]: Key facility changes for AF_RXRPC

Export the keyring key type definition and document its availability.

Add alternative types into the key's type_data union to make it more useful.
Not all users necessarily want to use it as a list_head (AF_RXRPC doesn't, for
example), so make it clear that it can be used in other ways.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Howells 2007-04-26 15:46:23 -07:00 committed by David S. Miller
parent 071b638689
commit 7318226ea2
3 changed files with 16 additions and 0 deletions

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@ -859,6 +859,18 @@ payload contents" for more information.
void unregister_key_type(struct key_type *type);
Under some circumstances, it may be desirable to desirable to deal with a
bundle of keys. The facility provides access to the keyring type for managing
such a bundle:
struct key_type key_type_keyring;
This can be used with a function such as request_key() to find a specific
keyring in a process's keyrings. A keyring thus found can then be searched
with keyring_search(). Note that it is not possible to use request_key() to
search a specific keyring, so using keyrings in this way is of limited utility.
===================================
NOTES ON ACCESSING PAYLOAD CONTENTS
===================================

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@ -160,6 +160,8 @@ struct key {
*/
union {
struct list_head link;
unsigned long x[2];
void *p[2];
} type_data;
/* key data

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@ -66,6 +66,8 @@ struct key_type key_type_keyring = {
.read = keyring_read,
};
EXPORT_SYMBOL(key_type_keyring);
/*
* semaphore to serialise link/link calls to prevent two link calls in parallel
* introducing a cycle