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nfsd4: use common rpc_cred for all callbacks 

Callbacks are always made using the machine's identity, so we can use a
single auth_generic credential shared among callbacks to all clients and
let the rpc code take care of the rest.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
J. Bruce Fields 2009-09-15 18:07:35 -04:00
parent 29ab23cc5d
commit 80fc015bdf
3 changed files with 12 additions and 29 deletions
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33
fs/nfsd/nfs4callback.c
View File

@ -432,42 +432,29 @@ static const struct rpc_call_ops nfsd4_cb_probe_ops = {
.rpc_call_done = nfsd4_cb_probe_done,
};
static struct rpc_cred *lookup_cb_cred(struct nfs4_cb_conn *cb)
{
struct auth_cred acred = {
.machine_cred = 1
};
struct rpc_auth *auth = cb->cb_client->cl_auth;
static struct rpc_cred *callback_cred;
/*
* Note in the gss case this doesn't actually have to wait for a
* gss upcall (or any calls to the client); this just creates a
* non-uptodate cred which the rpc state machine will fill in with
* a refresh_upcall later.
*/
return auth->au_ops->lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
int set_callback_cred(void)
{
callback_cred = rpc_lookup_machine_cred();
if (!callback_cred)
return -ENOMEM;
return 0;
}
void do_probe_callback(struct nfs4_client *clp)
{
struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
struct rpc_message msg = {
.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
.rpc_argp = clp,
.rpc_cred = callback_cred
};
struct rpc_cred *cred;
int status;
cred = lookup_cb_cred(cb);
if (IS_ERR(cred)) {
status = PTR_ERR(cred);
goto out;
}
cb->cb_cred = cred;
msg.rpc_cred = cb->cb_cred;
status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_SOFT,
&nfsd4_cb_probe_ops, (void *)clp);
out:
if (status) {
warn_no_callback_path(clp, status);
put_nfs4_client(clp);
@ -550,7 +537,7 @@ nfsd4_cb_recall(struct nfs4_delegation *dp)
struct rpc_message msg = {
.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
.rpc_argp = dp,
.rpc_cred = clp->cl_cb_conn.cb_cred
.rpc_cred = callback_cred
};
int status;

6
fs/nfsd/nfs4state.c
View File

@ -696,10 +696,6 @@ shutdown_callback_client(struct nfs4_client *clp)
clp->cl_cb_conn.cb_client = NULL;
rpc_shutdown_client(clnt);
}
if (clp->cl_cb_conn.cb_cred) {
put_rpccred(clp->cl_cb_conn.cb_cred);
clp->cl_cb_conn.cb_cred = NULL;
}
}
static inline void
@ -4020,7 +4016,7 @@ __nfs4_state_start(void)
return -ENOMEM;
queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
set_max_delegations();
return 0;
return set_callback_cred();
}
int

2
include/linux/nfsd/state.h
View File

@ -89,7 +89,6 @@ struct nfs4_cb_conn {
/* RPC client info */
atomic_t cb_set; /* successful CB_NULL call */
struct rpc_clnt * cb_client;
struct rpc_cred * cb_cred;
};
/* Maximum number of slots per session. 160 is useful for long haul TCP */
@ -362,6 +361,7 @@ extern int nfs4_in_grace(void);
extern __be32 nfs4_check_open_reclaim(clientid_t *clid);
extern void put_nfs4_client(struct nfs4_client *clp);
extern void nfs4_free_stateowner(struct kref *kref);
extern int set_callback_cred(void);
extern void nfsd4_probe_callback(struct nfs4_client *clp);
extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
extern void nfs4_put_delegation(struct nfs4_delegation *dp);