From 76181c134f87479fa13bf2548ddf2999055d34d4 Mon Sep 17 00:00:00 2001 From: David Howells Date: Tue, 16 Oct 2007 23:29:46 -0700 Subject: KEYS: Make request_key() and co fundamentally asynchronous Make request_key() and co fundamentally asynchronous to make it easier for NFS to make use of them. There are now accessor functions that do asynchronous constructions, a wait function to wait for construction to complete, and a completion function for the key type to indicate completion of construction. Note that the construction queue is now gone. Instead, keys under construction are linked in to the appropriate keyring in advance, and that anyone encountering one must wait for it to be complete before they can use it. This is done automatically for userspace. The following auxiliary changes are also made: (1) Key type implementation stuff is split from linux/key.h into linux/key-type.h. (2) AF_RXRPC provides a way to allocate null rxrpc-type keys so that AFS does not need to call key_instantiate_and_link() directly. (3) Adjust the debugging macros so that they're -Wformat checked even if they are disabled, and make it so they can be enabled simply by defining __KDEBUG to be consistent with other code of mine. (3) Documentation. [alan@lxorguk.ukuu.org.uk: keys: missing word in documentation] Signed-off-by: David Howells Signed-off-by: Alan Cox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- net/rxrpc/ar-key.c | 32 +++++++++++++++++++++++++++++--- 1 file changed, 29 insertions(+), 3 deletions(-) (limited to 'net/rxrpc/ar-key.c') diff --git a/net/rxrpc/ar-key.c b/net/rxrpc/ar-key.c index 7e049ff6ae60..9a8ff684da79 100644 --- a/net/rxrpc/ar-key.c +++ b/net/rxrpc/ar-key.c @@ -15,7 +15,7 @@ #include #include #include -#include +#include #include #include #include @@ -40,7 +40,6 @@ struct key_type key_type_rxrpc = { .destroy = rxrpc_destroy, .describe = rxrpc_describe, }; - EXPORT_SYMBOL(key_type_rxrpc); /* @@ -330,5 +329,32 @@ error: _leave(" = -ENOMEM [ins %d]", ret); return -ENOMEM; } - EXPORT_SYMBOL(rxrpc_get_server_data_key); + +/** + * rxrpc_get_null_key - Generate a null RxRPC key + * @keyname: The name to give the key. + * + * Generate a null RxRPC key that can be used to indicate anonymous security is + * required for a particular domain. + */ +struct key *rxrpc_get_null_key(const char *keyname) +{ + struct key *key; + int ret; + + key = key_alloc(&key_type_rxrpc, keyname, 0, 0, current, + KEY_POS_SEARCH, KEY_ALLOC_NOT_IN_QUOTA); + if (IS_ERR(key)) + return key; + + ret = key_instantiate_and_link(key, NULL, 0, NULL, NULL); + if (ret < 0) { + key_revoke(key); + key_put(key); + return ERR_PTR(ret); + } + + return key; +} +EXPORT_SYMBOL(rxrpc_get_null_key); -- cgit v1.2.1