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nfsd4: replace callback thread by asynchronous rpc 

We don't really need a synchronous rpc, and moving to an asynchronous
rpc allows us to do without this extra kthread.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
J. Bruce Fields 2009-03-05 15:01:11 -05:00
parent 3cef9ab266
commit e300a63ce4
1 changed files with 22 additions and 16 deletions
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38
fs/nfsd/nfs4callback.c
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@ -415,6 +415,21 @@ 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_cb_probe_done(struct rpc_task *task, void *calldata)
{
struct nfs4_client *clp = calldata;
if (task->tk_status)
warn_no_callback_path(clp, task->tk_status);
else
atomic_set(&clp->cl_callback.cb_set, 1);
put_nfs4_client(clp);
}
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_callback *cb)
{
struct auth_cred acred = {
@ -431,9 +446,8 @@ static struct rpc_cred *lookup_cb_cred(struct nfs4_callback *cb)
RPCAUTH_LOOKUP_NEW);
}
static int do_probe_callback(void *data)
void do_probe_callback(struct nfs4_client *clp)
{
struct nfs4_client *clp = data;
struct nfs4_callback *cb = &clp->cl_callback;
struct rpc_message msg = {
.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
@ -449,15 +463,13 @@ static int do_probe_callback(void *data)
}
cb->cb_cred = cred;
msg.rpc_cred = cb->cb_cred;
status = rpc_call_sync(cb->cb_client, &msg, RPC_TASK_SOFT);
status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_SOFT,
&nfsd4_cb_probe_ops, (void *)clp);
out:
if (status)
if (status) {
warn_no_callback_path(clp, status);
else
atomic_set(&cb->cb_set, 1);
put_nfs4_client(clp);
return 0;
put_nfs4_client(clp);
}
}
/*
@ -466,7 +478,6 @@ out:
void
nfsd4_probe_callback(struct nfs4_client *clp)
{
struct task_struct *t;
int status;
BUG_ON(atomic_read(&clp->cl_callback.cb_set));
@ -480,12 +491,7 @@ nfsd4_probe_callback(struct nfs4_client *clp)
/* the task holds a reference to the nfs4_client struct */
atomic_inc(&clp->cl_count);
t = kthread_run(do_probe_callback, clp, "nfs4_cb_probe");
if (IS_ERR(t))
atomic_dec(&clp->cl_count);
return;
do_probe_callback(clp);
}
/*