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nfs41: renewd sequence operations should take/put client reference 

renewd sends SEQUENCE requests to the NFS server in order to renew state.
As the request is asynchronous, renewd should take a reference to the
nfs_client to prevent concurrent umounts from freeing the session/client

Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Alexandros Batsakis 2010-02-05 03:45:05 -08:00 committed by Trond Myklebust
parent dc96aef96a
commit 7135840fc7
1 changed files with 12 additions and 6 deletions
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18
fs/nfs/nfs4proc.c
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@ -419,7 +419,8 @@ static void nfs41_sequence_done(struct nfs_client *clp,
clp->cl_last_renewal = timestamp;
spin_unlock(&clp->cl_lock);
/* Check sequence flags */
nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
if (atomic_read(&clp->cl_count) > 1)
nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
}
out:
/* The session may be reset by one of the error handlers. */
@ -5035,7 +5036,9 @@ static void nfs41_sequence_release(void *data)
{
struct nfs_client *clp = (struct nfs_client *)data;
nfs4_schedule_state_renewal(clp);
if (atomic_read(&clp->cl_count) > 1)
nfs4_schedule_state_renewal(clp);
nfs_put_client(clp);
}
static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
@ -5046,6 +5049,8 @@ static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
if (task->tk_status < 0) {
dprintk("%s ERROR %d\n", __func__, task->tk_status);
if (atomic_read(&clp->cl_count) == 1)
goto out;
if (_nfs4_async_handle_error(task, NULL, clp, NULL)
== -EAGAIN) {
@ -5054,7 +5059,7 @@ static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
}
}
dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
out:
kfree(task->tk_msg.rpc_argp);
kfree(task->tk_msg.rpc_resp);
@ -5092,12 +5097,13 @@ static int nfs41_proc_async_sequence(struct nfs_client *clp,
.rpc_cred = cred,
};
if (!atomic_inc_not_zero(&clp->cl_count))
return -EIO;
args = kzalloc(sizeof(*args), GFP_KERNEL);
if (!args)
return -ENOMEM;
res = kzalloc(sizeof(*res), GFP_KERNEL);
if (!res) {
if (!args || !res) {
kfree(args);
nfs_put_client(clp);
return -ENOMEM;
}
res->sr_slotid = NFS4_MAX_SLOT_TABLE;