Implements RECLAIM_COMPLETE as an asynchronous RPC.
NFS4ERR_DELAY is retried, NFS4ERR_DEADSESSION invokes the error handling
but does not result in a retry, since we don't want to have a lingering
RECLAIM_COMPLETE call sent in the middle of a possible new state recovery
cycle. If a session reset occurs, a new wave of reclaim operations will
follow, containing their own RECLAIM_COMPLETE call. We don't want a
retry to get on the way of recovery by incorrectly indicating to the
server that we're done reclaiming state.
A subsequent patch invokes the functionality.
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
---
fs/nfs/nfs4_fs.h | 1 +
fs/nfs/nfs4proc.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nfs/nfs4state.c | 8 ++++
3 files changed, 114 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index e8604af..1aac065 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -181,6 +181,7 @@ struct nfs4_state_recovery_ops {
int (*recover_lock)(struct nfs4_state *, struct file_lock *);
int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
struct rpc_cred * (*get_clid_cred)(struct nfs_client *);
+ int (*reclaim_complete)(struct nfs_client *);
};
struct nfs4_state_maintenance_ops {
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 25f4180..990533a 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4948,6 +4948,110 @@ static int nfs41_proc_async_sequence(struct nfs_client *clp,
&nfs41_sequence_ops, (void *)clp);
}
+struct nfs4_reclaim_complete_data {
+ struct nfs_client *clp;
+ struct nfs41_reclaim_complete_args arg;
+ struct nfs41_reclaim_complete_res res;
+};
+
+static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
+{
+ struct nfs4_reclaim_complete_data *calldata = data;
+
+ if (nfs4_setup_sequence(calldata->clp, &calldata->arg.seq_args,
+ &calldata->res.seq_res, 0, task))
+ return;
+
+ rpc_call_start(task);
+}
+
+static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
+{
+ struct nfs4_reclaim_complete_data *calldata = data;
+ struct nfs_client *clp = calldata->clp;
+ struct nfs4_sequence_res *res = &calldata->res.seq_res;
+
+ dprintk("--> %s\n", __func__);
+ nfs41_sequence_done(clp, res, task->tk_status);
+ switch (task->tk_status) {
+ case 0:
+ case -NFS4ERR_COMPLETE_ALREADY:
+ break;
+ case -NFS4ERR_BADSESSION:
+ case -NFS4ERR_DEADSESSION:
+ /*
+ * Handle the session error, but do not retry the operation, as
+ * we have no way of telling whether the clientid had to be
+ * reset before we got our reply. If reset, a new wave of
+ * reclaim operations will follow, containing their own reclaim
+ * complete. We don't want our retry to get on the way of
+ * recovery by incorrectly indicating to the server that we're
+ * done reclaiming state since the process had to be restarted.
+ */
+ _nfs4_async_handle_error(task, NULL, clp, NULL);
+ break;
+ default:
+ if (_nfs4_async_handle_error(
+ task, NULL, clp, NULL) == -EAGAIN) {
+ rpc_restart_call_prepare(task);
+ return;
+ }
+ }
+ nfs41_sequence_free_slot(clp, res);
+
+ dprintk("<-- %s\n", __func__);
+}
+
+static void nfs4_free_reclaim_complete_data(void *data)
+{
+ struct nfs4_reclaim_complete_data *calldata = data;
+
+ kfree(calldata);
+}
+
+static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
+ .rpc_call_prepare = nfs4_reclaim_complete_prepare,
+ .rpc_call_done = nfs4_reclaim_complete_done,
+ .rpc_release = nfs4_free_reclaim_complete_data,
+};
+
+/*
+ * Issue a global reclaim complete.
+ */
+static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
+{
+ struct nfs4_reclaim_complete_data *calldata;
+ struct rpc_task *task;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
+ };
+ struct rpc_task_setup task_setup_data = {
+ .rpc_client = clp->cl_rpcclient,
+ .rpc_message = &msg,
+ .callback_ops = &nfs4_reclaim_complete_call_ops,
+ .flags = RPC_TASK_ASYNC,
+ };
+ int status = -ENOMEM;
+
+ dprintk("--> %s\n", __func__);
+ calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
+ if (calldata == NULL)
+ goto out;
+ calldata->clp = clp;
+ calldata->arg.one_fs = 0;
+ calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
+
+ msg.rpc_argp = &calldata->arg;
+ msg.rpc_resp = &calldata->res;
+ task_setup_data.callback_data = calldata;
+ task = rpc_run_task(&task_setup_data);
+ if (IS_ERR(task))
+ status = PTR_ERR(task);
+ rpc_put_task(task);
+out:
+ dprintk("<-- %s status=%d\n", __func__, status);
+ return status;
+}
#endif /* CONFIG_NFS_V4_1 */
struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
@@ -4967,6 +5071,7 @@ struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
.recover_lock = nfs4_lock_reclaim,
.establish_clid = nfs4_proc_exchange_id,
.get_clid_cred = nfs4_get_exchange_id_cred,
+ .reclaim_complete = nfs41_proc_reclaim_complete,
};
#endif /* CONFIG_NFS_V4_1 */
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index ae90df8..e325b64 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1011,6 +1011,14 @@ static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
}
+static void nfs4_reclaim_complete(struct nfs_client *clp,
+ const struct nfs4_state_recovery_ops *ops)
+{
+ /* Notify the server we're done reclaiming our state */
+ if (ops->reclaim_complete)
+ (void)ops->reclaim_complete(clp);
+}
+
static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
{
struct nfs4_state_owner *sp;
--
1.5.4.3
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