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authorNeilBrown <neilb@suse.de>2014-07-14 05:28:20 +0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-08-04 01:14:12 +0400
commitbd95608053b7f7813351b0defc0e3e7ef8cf2803 (patch)
treefde08b1ecc2c4aedd30a68244ca502ce5f81f0fe /net/sunrpc/auth_null.c
parentd51ac1a8e9b86b2d17d349bb256869cab6522787 (diff)
downloadlinux-bd95608053b7f7813351b0defc0e3e7ef8cf2803.tar.xz
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 <neilb@suse.de> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'net/sunrpc/auth_null.c')
-rw-r--r--net/sunrpc/auth_null.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/sunrpc/auth_null.c b/net/sunrpc/auth_null.c
index f0ebe07978a2..712c123e04e9 100644
--- a/net/sunrpc/auth_null.c
+++ b/net/sunrpc/auth_null.c
@@ -35,6 +35,8 @@ nul_destroy(struct rpc_auth *auth)
static struct rpc_cred *
nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
{
+ if (flags & RPCAUTH_LOOKUP_RCU)
+ return &null_cred;
return get_rpccred(&null_cred);
}