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nfsd4: fix callback restarting

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Ensure a new callback is added to the client's list of callbacks at most
once.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2011-01-14 14:25:48 -05:00
parent 4795bb37ef
commit a8f2800b4f
1 changed files with 9 additions and 12 deletions
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21
fs/nfsd/nfs4callback.c
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@ -639,9 +639,12 @@ static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
if (!nfsd41_cb_get_slot(clp, task))
return;
}
cb->cb_done = false;
spin_lock(&clp->cl_lock);
list_add(&cb->cb_per_client, &clp->cl_callbacks);
if (list_empty(&cb->cb_per_client)) {
/* This is the first call, not a restart */
cb->cb_done = false;
list_add(&cb->cb_per_client, &clp->cl_callbacks);
}
spin_unlock(&clp->cl_lock);
rpc_call_start(task);
}
@ -678,10 +681,10 @@ static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
nfsd4_cb_done(task, calldata);
if (current_rpc_client == NULL) {
/* We're shutting down; give up. */
/* XXX: err, or is it ok just to fall through
* and rpc_restart_call? */
if (current_rpc_client != task->tk_client) {
/* We're shutting down or changing cl_cb_client; leave
* it to nfsd4_process_cb_update to restart the call if
* necessary. */
return;
}
@ -699,12 +702,6 @@ static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
default:
/* Network partition? */
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);
run_nfsd4_cb(&dp->dl_recall);
return;
}
}
if (dp->dl_retries--) {
rpc_delay(task, 2*HZ);