From: root <root@vadmin.(none)>
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@xxxxxxxxxx>
---
fs/nfs/nfs4proc.c | 23 +++++++++++++++++++----
1 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index ce44b5a..87fd43a 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -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. */
@@ -5032,6 +5033,8 @@ 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) {
@@ -5041,8 +5044,9 @@ void nfs41_sequence_call_done(struct rpc_task *task, void *data)
}
dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
- nfs4_schedule_state_renewal(clp);
-
+ if (atomic_read(&clp->cl_count) > 1)
+ nfs4_schedule_state_renewal(clp);
+out:
kfree(task->tk_msg.rpc_argp);
kfree(task->tk_msg.rpc_resp);
@@ -5064,9 +5068,15 @@ static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
rpc_call_start(task);
}
+static void nfs41_sequence_release(void *calldata)
+{
+ nfs_put_client((struct nfs_client *) calldata);
+}
+
static const struct rpc_call_ops nfs41_sequence_ops = {
.rpc_call_done = nfs41_sequence_call_done,
.rpc_call_prepare = nfs41_sequence_prepare,
+ .rpc_release = nfs41_sequence_release,
};
static int nfs41_proc_async_sequence(struct nfs_client *clp,
@@ -5079,11 +5089,16 @@ 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)
+ if (!args) {
+ nfs_put_client(clp);
return -ENOMEM;
+ }
res = kzalloc(sizeof(*res), GFP_KERNEL);
if (!res) {
+ nfs_put_client(clp);
kfree(args);
return -ENOMEM;
}
--
1.6.2.5
--
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