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authorDavid Howells <dhowells@redhat.com>2007-10-16 23:29:46 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 08:42:57 -0700
commit76181c134f87479fa13bf2548ddf2999055d34d4 (patch)
tree34694341c190e7ecdd3111ee48e4b98602ff012f /net/rxrpc
parent398c95bdf2c24d7866692a40ba04425aef238cdd (diff)
downloadlinux-2.6.38-lt-ux500-76181c134f87479fa13bf2548ddf2999055d34d4.tar.gz
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 <dhowells@redhat.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net/rxrpc')
-rw-r--r--net/rxrpc/af_rxrpc.c1
-rw-r--r--net/rxrpc/ar-key.c32
2 files changed, 30 insertions, 3 deletions
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 0803f305ed0..c680017f5c8 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -14,6 +14,7 @@
#include <linux/skbuff.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
+#include <linux/key-type.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
diff --git a/net/rxrpc/ar-key.c b/net/rxrpc/ar-key.c
index 7e049ff6ae6..9a8ff684da7 100644
--- a/net/rxrpc/ar-key.c
+++ b/net/rxrpc/ar-key.c
@@ -15,7 +15,7 @@
#include <linux/module.h>
#include <linux/net.h>
#include <linux/skbuff.h>
-#include <linux/key.h>
+#include <linux/key-type.h>
#include <linux/crypto.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
@@ -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);