[PATCH 2/4] nfsd: introduce a generic nfsd4_cb

Christoph Hellwig
2014-09-24T10:16:59Z

Add a helper to queue up a callback. CB_NULL has a bit of special casing
because it is special in the specification, but all other new callback
operations will be able to share code with this and a few more changes
to refactor the callback code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/nfsd/nfs4callback.c | 47 ++++++++++++-----------------------------------
fs/nfsd/nfs4state.c | 4 +++-
fs/nfsd/state.h | 10 +++++++++-
3 files changed, 24 insertions(+), 37 deletions(-)

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 06e07e1..022edcf 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -49,12 +49,6 @@ static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason);

/* Index of predefined Linux callback client operations */

-enum {
- NFSPROC4_CLNT_CB_NULL = 0,
- NFSPROC4_CLNT_CB_RECALL,
- NFSPROC4_CLNT_CB_SEQUENCE,
-};
-
#define to_delegation(cb) \
container_of(cb, struct nfs4_delegation, dl_recall)

@@ -749,24 +743,9 @@ static const struct rpc_call_ops nfsd4_cb_probe_ops = {

static struct workqueue_struct *callback_wq;

-static void run_nfsd4_cb(struct nfsd4_callback *cb)
-{
- queue_work(callback_wq, &cb->cb_work);
-}
-
static void do_probe_callback(struct nfs4_client *clp)
{
- struct nfsd4_callback *cb = &clp->cl_cb_null;
-
- cb->cb_clp = clp;
-
- cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL];
- cb->cb_msg.rpc_argp = NULL;
- cb->cb_msg.rpc_resp = NULL;
-
- cb->cb_ops = &nfsd4_cb_probe_ops;
-
- run_nfsd4_cb(cb);
+ return nfsd4_cb(&clp->cl_cb_null, clp, NFSPROC4_CLNT_CB_NULL);
}

/*
@@ -1005,7 +984,7 @@ static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
}
/* Yay, the callback channel's back! Restart any callbacks: */
list_for_each_entry(cb, &clp->cl_callbacks, cb_per_client)
- run_nfsd4_cb(cb);
+ queue_work(callback_wq, &cb->cb_work);
}

static void
@@ -1046,21 +1025,19 @@ nfsd4_run_cb_recall(struct work_struct *w)
nfsd4_run_callback_rpc(cb);
}

-void nfsd4_cb_recall(struct nfs4_delegation *dp)
+void nfsd4_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
+ enum nfsd4_cb_op op)
{
- struct nfsd4_callback *cb = &dp->dl_recall;
- struct nfs4_client *clp = dp->dl_stid.sc_client;
-
- dp->dl_retries = 1;
cb->cb_clp = clp;
- cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL];
+ cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op];
cb->cb_msg.rpc_argp = cb;
cb->cb_msg.rpc_resp = cb;
+ if (op == NFSPROC4_CLNT_CB_NULL)
+ cb->cb_ops = &nfsd4_cb_probe_ops;
+ else
+ cb->cb_ops = &nfsd4_cb_recall_ops;
+ INIT_LIST_HEAD(&cb->cb_per_client);
+ cb->cb_done = true;

- cb->cb_ops = &nfsd4_cb_recall_ops;
-
- INIT_LIST_HEAD(&cb->cb_per_client);
- cb->cb_done = true;
-
- run_nfsd4_cb(&dp->dl_recall);
+ queue_work(callback_wq, &cb->cb_work);
}
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 8597fbe..90b909e 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3383,7 +3383,9 @@ static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
* it's safe to take a reference.
*/
atomic_inc(&dp->dl_stid.sc_count);
- nfsd4_cb_recall(dp);
+ dp->dl_retries = 1;
+ nfsd4_cb(&dp->dl_recall, dp->dl_stid.sc_client,
+ NFSPROC4_CLNT_CB_RECALL);
}

/* Called from break_lease() with i_lock held. */
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 74b0700..515408b 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -515,6 +515,13 @@ static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)
#define RD_STATE 0x00000010
#define WR_STATE 0x00000020

+enum nfsd4_cb_op {
+ NFSPROC4_CLNT_CB_NULL = 0,
+ NFSPROC4_CLNT_CB_RECALL,
+ NFSPROC4_CLNT_CB_SEQUENCE,
+};
+
+
struct nfsd4_compound_state;
struct nfsd_net;

@@ -534,7 +541,8 @@ void nfsd4_run_cb_recall(struct work_struct *w);
extern void nfsd4_probe_callback(struct nfs4_client *clp);
extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
-extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
+extern void nfsd4_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
+ enum nfsd4_cb_op op);
extern int nfsd4_create_callback_queue(void);
extern void nfsd4_destroy_callback_queue(void);
extern void nfsd4_shutdown_callback(struct nfs4_client *);
--
1.9.1