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nfsd4: make recall callback an asynchronous rpc 

As with the probe, this removes the need for another kthread.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
J. Bruce Fields 2009-05-01 22:36:55 -04:00
parent 3aea09dc91
commit 63e4863fab
2 changed files with 52 additions and 50 deletions
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72
fs/nfsd/nfs4callback.c
View File

@ -494,6 +494,49 @@ nfsd4_probe_callback(struct nfs4_client *clp)
do_probe_callback(clp);
}
static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
{
struct nfs4_delegation *dp = calldata;
struct nfs4_client *clp = dp->dl_client;
switch (task->tk_status) {
case -EIO:
/* Network partition? */
atomic_set(&clp->cl_cb_conn.cb_set, 0);
warn_no_callback_path(clp, task->tk_status);
case -EBADHANDLE:
case -NFS4ERR_BAD_STATEID:
/* Race: client probably got cb_recall
* before open reply granting delegation */
break;
default:
/* success, or error we can't handle */
return;
}
if (dp->dl_retries--) {
rpc_delay(task, 2*HZ);
task->tk_status = 0;
rpc_restart_call(task);
} else {
atomic_set(&clp->cl_cb_conn.cb_set, 0);
warn_no_callback_path(clp, task->tk_status);
}
}
static void nfsd4_cb_recall_release(void *calldata)
{
struct nfs4_delegation *dp = calldata;
struct nfs4_client *clp = dp->dl_client;
nfs4_put_delegation(dp);
put_nfs4_client(clp);
}
static const struct rpc_call_ops nfsd4_cb_recall_ops = {
.rpc_call_done = nfsd4_cb_recall_done,
.rpc_release = nfsd4_cb_recall_release,
};
/*
* called with dp->dl_count inc'ed.
*/
@ -507,32 +550,13 @@ nfsd4_cb_recall(struct nfs4_delegation *dp)
.rpc_argp = dp,
.rpc_cred = clp->cl_cb_conn.cb_cred
};
int status = 0;
int status;
dp->dl_retries = 1;
status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
while (dp->dl_retries--) {
switch (status) {
case -EIO:
/* Network partition? */
atomic_set(&clp->cl_cb_conn.cb_set, 0);
case -EBADHANDLE:
case -NFS4ERR_BAD_STATEID:
/* Race: client probably got cb_recall
* before open reply granting delegation */
break;
default:
goto out_put_cred;
}
ssleep(2);
status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
}
out_put_cred:
/*
* Success or failure, now we're either waiting for lease expiration
* or deleg_return.
*/
status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT,
&nfsd4_cb_recall_ops, dp);
if (status) {
put_nfs4_client(clp);
nfs4_put_delegation(dp);
return;
}
}

26
fs/nfsd/nfs4state.c
View File

@ -2059,19 +2059,6 @@ nfs4_file_downgrade(struct file *filp, unsigned int share_access)
}
}
/*
* Recall a delegation
*/
static int
do_recall(void *__dp)
{
struct nfs4_delegation *dp = __dp;
dp->dl_file->fi_had_conflict = true;
nfsd4_cb_recall(dp);
return 0;
}
/*
* Spawn a thread to perform a recall on the delegation represented
* by the lease (file_lock)
@ -2084,7 +2071,6 @@ static
void nfsd_break_deleg_cb(struct file_lock *fl)
{
struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
struct task_struct *t;
dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
if (!dp)
@ -2112,16 +2098,8 @@ void nfsd_break_deleg_cb(struct file_lock *fl)
*/
fl->fl_break_time = 0;
t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
if (IS_ERR(t)) {
struct nfs4_client *clp = dp->dl_client;
printk(KERN_INFO "NFSD: Callback thread failed for "
"for client (clientid %08x/%08x)\n",
clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
put_nfs4_client(dp->dl_client);
nfs4_put_delegation(dp);
}
dp->dl_file->fi_had_conflict = true;
nfsd4_cb_recall(dp);
}
/*