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nfsd: introduce a generic nfsd4_cb 

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>
Reviewed-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Christoph Hellwig 2014-09-24 12:19:17 +02:00 committed by J. Bruce Fields
parent 2faf3b4350
commit 326129d02a
3 changed files with 22 additions and 35 deletions
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43
fs/nfsd/nfs4callback.c
View File

@ -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;
cb->cb_ops = &nfsd4_cb_recall_ops;
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;
run_nfsd4_cb(&dp->dl_recall);
queue_work(callback_wq, &cb->cb_work);
}

4
fs/nfsd/nfs4state.c
View File

@ -3388,7 +3388,9 @@ 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. */

10
fs/nfsd/state.h
View File

@ -517,6 +517,13 @@ 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;
@ -536,7 +543,8 @@ 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 *);