• David Howells's avatar
    KEYS: Make request_key() and co fundamentally asynchronous · 76181c13
    David Howells authored
    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: 's avatarDavid Howells <dhowells@redhat.com>
    Signed-off-by: 's avatarAlan Cox <alan@redhat.com>
    Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
    76181c13
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