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authorNeilBrown <neilb@suse.com>2018-12-03 11:30:30 +1100
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2018-12-19 13:52:45 -0500
commit5e16923b432bfe79fdfb7cd95ed8e63f6438b663 (patch)
tree92c842d96a8cacdead34c4f260bd371077f06793 /fs/nfs/nfs4state.c
parentecd5f97e1c7cd6124e3c3053beb5f2239aeacf8e (diff)
downloadlinux-5e16923b432bfe79fdfb7cd95ed8e63f6438b663.tar.bz2
NFS/SUNRPC: don't lookup machine credential until rpcauth_bindcred().
When NFS creates a machine credential, it is a "generic" credential, not tied to any auth protocol, and is really just a container for the princpal name. This doesn't get linked to a genuine credential until rpcauth_bindcred() is called. The lookup always succeeds, so various places that test if the machine credential is NULL, are pointless. As a step towards getting rid of generic credentials, this patch gets rid of generic machine credentials. The nfs_client and rpc_client just hold a pointer to a constant principal name. When a machine credential is wanted, a special static 'struct rpc_cred' pointer is used. rpcauth_bindcred() recognizes this, finds the principal from the client, and binds the correct credential. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/nfs4state.c')
-rw-r--r--fs/nfs/nfs4state.c21
1 files changed, 4 insertions, 17 deletions
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index f142fca6995b..6304c79dbcd1 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -166,28 +166,15 @@ out:
struct rpc_cred *nfs4_get_machine_cred(struct nfs_client *clp)
{
- struct rpc_cred *cred = clp->cl_root_cred;
-
- if (!cred)
- cred = clp->cl_machine_cred;
- if (cred)
- return get_rpccred(cred);
- return cred;
+ return get_rpccred(rpc_machine_cred());
}
static void nfs4_root_machine_cred(struct nfs_client *clp)
{
- struct rpc_cred *new;
- new = rpc_lookup_machine_cred(NULL);
- spin_lock(&clp->cl_lock);
- if (clp->cl_root_cred == NULL) {
- clp->cl_root_cred = new;
- new = NULL;
- }
- spin_unlock(&clp->cl_lock);
- if (new != NULL)
- put_rpccred(new);
+ /* Force root creds instead of machine */
+ clp->cl_principal = NULL;
+ clp->cl_rpcclient->cl_principal = NULL;
}
static struct rpc_cred *