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SUNRPC: add 'struct cred *' to auth_cred and rpc_cred

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The SUNRPC credential framework was put together before
Linux has 'struct cred'.  Now that we have it, it makes sense to
use it.
This first step just includes a suitable 'struct cred *' pointer
in every 'struct auth_cred' and almost every 'struct rpc_cred'.

The rpc_cred used for auth_null has a NULL 'struct cred *' as nothing
else really makes sense.

For rpc_cred, the pointer is reference counted.
For auth_cred it isn't.  struct auth_cred are either allocated on
the stack, in which case the thread owns a reference to the auth,
or are part of 'struct generic_cred' in which case gc_base owns the
reference, and "acred" shares it.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
NeilBrown
2018-12-03 11:30:30 +11:00
committed by Anna Schumaker
parent f06bc03339
commit 97f68c6b02
7 changed files with 48 additions and 3 deletions
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13
fs/nfsd/nfs4callback.c
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@@ -858,10 +858,21 @@ static struct rpc_cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc
} else {
struct rpc_auth *auth = client->cl_auth;
struct auth_cred acred = {};
struct cred *kcred;
struct rpc_cred *ret;
kcred = prepare_kernel_cred(NULL);
if (!kcred)
return NULL;
acred.uid = ses->se_cb_sec.uid;
acred.gid = ses->se_cb_sec.gid;
return auth->au_ops->lookup_cred(client->cl_auth, &acred, 0);
kcred->uid = acred.uid;
kcred->gid = acred.gid;
acred.cred = kcred;
ret = auth->au_ops->lookup_cred(client->cl_auth, &acred, 0);
put_cred(kcred);
return ret;
}
}