From: NeilBrown Date: Mon, 14 Jul 2014 01:28:20 +0000 (+1000) Subject: sunrpc/auth: allow lockless (rcu) lookup of credential cache. X-Git-Tag: cleanup-for-v3.18~41^2~8 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bd95608053b7f7813351b0defc0e3e7ef8cf2803;p=pandora-kernel.git sunrpc/auth: allow lockless (rcu) lookup of credential cache. The new flag RPCAUTH_LOOKUP_RCU to credential lookup avoids locking, does not take a reference on the returned credential, and returns -ECHILD if a simple lookup was not possible. The returned value can only be used within an rcu_read_lock protected region. The main user of this is the new rpc_lookup_cred_nonblock() which returns a pointer to the current credential which is only rcu-safe (no ref-count held), and might return -ECHILD if allocation was required. Signed-off-by: NeilBrown Signed-off-by: Trond Myklebust --- Reading git-diff-tree failed