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nfsd4: keep finer-grained callback status

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Distinguish between when the callback channel is known to be down, and
when it is not yet confirmed.  This will be useful in the 4.1 case.

Also, we don't seem to be using the fact that this field is atomic.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
J. Bruce Fields 2010-04-30 18:51:44 -04:00 committed by J. Bruce Fields
parent f0418aa4b1
commit 77a3569d6c
3 changed files with 22 additions and 17 deletions
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26
fs/nfsd/nfs4callback.c
View File

@ -470,8 +470,6 @@ static int max_cb_time(void)
return max(nfsd4_lease/10, (time_t)1) * HZ;
}
/* Reference counting, callback cleanup, etc., all look racy as heck.
* And why is cl_cb_set an atomic? */
static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses)
{
@ -526,14 +524,20 @@ static void warn_no_callback_path(struct nfs4_client *clp, int reason)
(int)clp->cl_name.len, clp->cl_name.data, reason);
}
static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason)
{
clp->cl_cb_state = NFSD4_CB_DOWN;
warn_no_callback_path(clp, reason);
}
static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
{
struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
if (task->tk_status)
warn_no_callback_path(clp, task->tk_status);
nfsd4_mark_cb_down(clp, task->tk_status);
else
atomic_set(&clp->cl_cb_set, 1);
clp->cl_cb_state = NFSD4_CB_UP;
}
static const struct rpc_call_ops nfsd4_cb_probe_ops = {
@ -579,14 +583,15 @@ static void do_probe_callback(struct nfs4_client *clp)
*/
void nfsd4_probe_callback(struct nfs4_client *clp)
{
/* XXX: atomicity? Also, should we be using cl_cb_flags? */
clp->cl_cb_state = NFSD4_CB_UNKNOWN;
set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_cb_flags);
do_probe_callback(clp);
}
void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
{
BUG_ON(atomic_read(&clp->cl_cb_set));
clp->cl_cb_state = NFSD4_CB_UNKNOWN;
spin_lock(&clp->cl_lock);
memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn));
spin_unlock(&clp->cl_lock);
@ -693,8 +698,7 @@ static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
break;
default:
/* Network partition? */
atomic_set(&clp->cl_cb_set, 0);
warn_no_callback_path(clp, task->tk_status);
nfsd4_mark_cb_down(clp, task->tk_status);
if (current_rpc_client != task->tk_client) {
/* queue a callback on the new connection: */
atomic_inc(&dp->dl_count);
@ -707,10 +711,8 @@ static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
task->tk_status = 0;
rpc_restart_call_prepare(task);
return;
} else {
atomic_set(&clp->cl_cb_set, 0);
warn_no_callback_path(clp, task->tk_status);
}
} else
nfsd4_mark_cb_down(clp, task->tk_status);
}
static void nfsd4_cb_recall_release(void *calldata)

8
fs/nfsd/nfs4state.c
View File

@ -1071,7 +1071,7 @@ static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
atomic_set(&clp->cl_refcount, 0);
atomic_set(&clp->cl_cb_set, 0);
clp->cl_cb_state = NFSD4_CB_UNKNOWN;
INIT_LIST_HEAD(&clp->cl_idhash);
INIT_LIST_HEAD(&clp->cl_strhash);
INIT_LIST_HEAD(&clp->cl_openowners);
@ -2003,7 +2003,6 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
status = nfserr_clid_inuse;
else {
atomic_set(&conf->cl_cb_set, 0);
nfsd4_change_callback(conf, &unconf->cl_cb_conn);
nfsd4_probe_callback(conf);
expire_client(unconf);
@ -2633,7 +2632,8 @@ nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_sta
{
struct nfs4_delegation *dp;
struct nfs4_stateowner *sop = stp->st_stateowner;
int cb_up = atomic_read(&sop->so_client->cl_cb_set);
/* XXX: or unknown and nfsv4.1: */
int cb_up = (sop->so_client->cl_cb_state == NFSD4_CB_UP);
struct file_lock *fl;
int status, flag = 0;
@ -2823,7 +2823,7 @@ nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
renew_client(clp);
status = nfserr_cb_path_down;
if (!list_empty(&clp->cl_delegations)
&& !atomic_read(&clp->cl_cb_set))
&& clp->cl_cb_state != NFSD4_CB_UP)
goto out;
status = nfs_ok;
out:

5
fs/nfsd/state.h
View File

@ -242,7 +242,10 @@ struct nfs4_client {
unsigned long cl_cb_flags;
struct rpc_clnt *cl_cb_client;
u32 cl_cb_ident;
atomic_t cl_cb_set;
#define NFSD4_CB_UP 0
#define NFSD4_CB_UNKNOWN 1
#define NFSD4_CB_DOWN 2
int cl_cb_state;
struct nfsd4_callback cl_cb_null;
struct nfsd4_session *cl_cb_session;