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nfs4: renewd renew operations should take/put a client reference

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renewd sends RENEW 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 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 03:45:06 -08:00
committed by Trond Myklebust
parent 7135840fc7
commit 0851de0617
1 changed files with 5 additions and 1 deletions
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4
fs/nfs/nfs4proc.c
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@@ -3152,7 +3152,9 @@ static void nfs4_renew_release(void *data)
{ {
struct nfs_client *clp = data; struct nfs_client *clp = data;
if (atomic_read(&clp->cl_count) > 1)
nfs4_schedule_state_renewal(clp); nfs4_schedule_state_renewal(clp);
nfs_put_client(clp);
} }
static void nfs4_renew_done(struct rpc_task *task, void *data) static void nfs4_renew_done(struct rpc_task *task, void *data)
@@ -3185,6 +3187,8 @@ int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
.rpc_cred = cred, .rpc_cred = cred,
}; };
if (!atomic_inc_not_zero(&clp->cl_count))
return -EIO;
return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT, return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
&nfs4_renew_ops, clp); &nfs4_renew_ops, clp);
} }