Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7318226ea2931a627f3572e5f4804c91ca19ecbc
Commit:     7318226ea2931a627f3572e5f4804c91ca19ecbc
Parent:     071b638689464c6b39407025eedd810d5b5e6f5d
Author:     David Howells <[EMAIL PROTECTED]>
AuthorDate: Thu Apr 26 15:46:23 2007 -0700
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Thu Apr 26 15:46:23 2007 -0700

    [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 <[EMAIL PROTECTED]>
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
 Documentation/keys.txt  |   12 ++++++++++++
 include/linux/key.h     |    2 ++
 security/keys/keyring.c |    2 ++
 3 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/Documentation/keys.txt b/Documentation/keys.txt
index 60c665d..81d9aa0 100644
--- a/Documentation/keys.txt
+++ b/Documentation/keys.txt
@@ -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
 ===================================
diff --git a/include/linux/key.h b/include/linux/key.h
index 169f05e..a9220e7 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -160,6 +160,8 @@ struct key {
         */
        union {
                struct list_head        link;
+               unsigned long           x[2];
+               void                    *p[2];
        } type_data;
 
        /* key data
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index ad45ce7..88292e3 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -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
-
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