*/
#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc_xprt.h>
#include <linux/slab.h>
#include "nfsd.h"
#include "state.h"
cb_sequence_dec_sz + \
op_dec_sz)
-struct nfs4_rpc_args {
- void *args_op;
- struct nfsd4_cb_sequence args_seq;
-};
-
/*
* Generic encode routines from fs/nfs/nfs4xdr.c
*/
static int max_cb_time(void)
{
- return max(NFSD_LEASE_TIME/10, (time_t)1) * HZ;
+ return max(nfsd4_lease/10, (time_t)1) * HZ;
}
/* Reference counting, callback cleanup, etc., all look racy as heck.
- * And why is cb_set an atomic? */
+ * And why is cl_cb_set an atomic? */
-int setup_callback_client(struct nfs4_client *clp)
+int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *cb)
{
- struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
struct rpc_timeout timeparms = {
.to_initval = max_cb_time(),
.to_retries = 0,
if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5))
return -EINVAL;
if (cb->cb_minorversion) {
- args.bc_xprt = clp->cl_cb_xprt;
+ args.bc_xprt = cb->cb_xprt;
args.protocol = XPRT_TRANSPORT_BC_TCP;
}
/* Create RPC client */
PTR_ERR(client));
return PTR_ERR(client);
}
- cb->cb_client = client;
+ nfsd4_set_callback_client(clp, client);
return 0;
}
if (task->tk_status)
warn_no_callback_path(clp, task->tk_status);
else
- atomic_set(&clp->cl_cb_conn.cb_set, 1);
- put_nfs4_client(clp);
+ atomic_set(&clp->cl_cb_set, 1);
}
static const struct rpc_call_ops nfsd4_cb_probe_ops = {
void do_probe_callback(struct nfs4_client *clp)
{
- struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
struct rpc_message msg = {
.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
.rpc_argp = clp,
};
int status;
- status = rpc_call_async(cb->cb_client, &msg,
+ status = rpc_call_async(clp->cl_cb_client, &msg,
RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
&nfsd4_cb_probe_ops, (void *)clp);
- if (status) {
+ if (status)
warn_no_callback_path(clp, status);
- put_nfs4_client(clp);
- }
}
/*
* Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
*/
-void
-nfsd4_probe_callback(struct nfs4_client *clp)
+void nfsd4_probe_callback(struct nfs4_client *clp, struct nfs4_cb_conn *cb)
{
int status;
- BUG_ON(atomic_read(&clp->cl_cb_conn.cb_set));
+ BUG_ON(atomic_read(&clp->cl_cb_set));
- status = setup_callback_client(clp);
+ status = setup_callback_client(clp, cb);
if (status) {
warn_no_callback_path(clp, status);
return;
}
-
- /* the task holds a reference to the nfs4_client struct */
- atomic_inc(&clp->cl_count);
-
do_probe_callback(clp);
}
}
}
+
static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
{
struct nfs4_delegation *dp = calldata;
struct nfs4_client *clp = dp->dl_client;
+ struct rpc_clnt *current_rpc_client = clp->cl_cb_client;
nfsd4_cb_done(task, calldata);
+ if (current_rpc_client == NULL) {
+ /* We're shutting down; give up. */
+ /* XXX: err, or is it ok just to fall through
+ * and rpc_restart_call? */
+ return;
+ }
+
switch (task->tk_status) {
case -EIO:
/* Network partition? */
- atomic_set(&clp->cl_cb_conn.cb_set, 0);
+ atomic_set(&clp->cl_cb_set, 0);
warn_no_callback_path(clp, task->tk_status);
+ if (current_rpc_client != task->tk_client) {
+ /* queue a callback on the new connection: */
+ nfsd4_cb_recall(dp);
+ return;
+ }
case -EBADHANDLE:
case -NFS4ERR_BAD_STATEID:
/* Race: client probably got cb_recall
break;
default:
/* success, or error we can't handle */
- goto done;
+ return;
}
if (dp->dl_retries--) {
rpc_delay(task, 2*HZ);
rpc_restart_call(task);
return;
} else {
- atomic_set(&clp->cl_cb_conn.cb_set, 0);
+ atomic_set(&clp->cl_cb_set, 0);
warn_no_callback_path(clp, task->tk_status);
}
-done:
- kfree(task->tk_msg.rpc_argp);
}
static void nfsd4_cb_recall_release(void *calldata)
{
struct nfs4_delegation *dp = calldata;
- struct nfs4_client *clp = dp->dl_client;
nfs4_put_delegation(dp);
- put_nfs4_client(clp);
}
static const struct rpc_call_ops nfsd4_cb_recall_ops = {
.rpc_release = nfsd4_cb_recall_release,
};
+static struct workqueue_struct *callback_wq;
+
+int nfsd4_create_callback_queue(void)
+{
+ callback_wq = create_singlethread_workqueue("nfsd4_callbacks");
+ if (!callback_wq)
+ return -ENOMEM;
+ return 0;
+}
+
+void nfsd4_destroy_callback_queue(void)
+{
+ destroy_workqueue(callback_wq);
+}
+
+void nfsd4_set_callback_client(struct nfs4_client *clp, struct rpc_clnt *new)
+{
+ struct rpc_clnt *old = clp->cl_cb_client;
+
+ clp->cl_cb_client = new;
+ /*
+ * After this, any work that saw the old value of cl_cb_client will
+ * be gone:
+ */
+ flush_workqueue(callback_wq);
+ /* So we can safely shut it down: */
+ if (old)
+ rpc_shutdown_client(old);
+}
+
/*
* called with dp->dl_count inc'ed.
*/
-void
-nfsd4_cb_recall(struct nfs4_delegation *dp)
+static void _nfsd4_cb_recall(struct nfs4_delegation *dp)
{
struct nfs4_client *clp = dp->dl_client;
- struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
- struct nfs4_rpc_args *args;
+ struct rpc_clnt *clnt = clp->cl_cb_client;
+ struct nfs4_rpc_args *args = &dp->dl_recall.cb_args;
struct rpc_message msg = {
.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
.rpc_cred = callback_cred
};
- int status = -ENOMEM;
+ int status;
+
+ if (clnt == NULL)
+ return; /* Client is shutting down; give up. */
- args = kzalloc(sizeof(*args), GFP_KERNEL);
- if (!args)
- goto out;
args->args_op = dp;
msg.rpc_argp = args;
dp->dl_retries = 1;
status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT,
&nfsd4_cb_recall_ops, dp);
-out:
- if (status) {
- kfree(args);
- put_nfs4_client(clp);
+ if (status)
nfs4_put_delegation(dp);
- }
+}
+
+void nfsd4_do_callback_rpc(struct work_struct *w)
+{
+ /* XXX: for now, just send off delegation recall. */
+ /* In future, generalize to handle any sort of callback. */
+ struct nfsd4_callback *c = container_of(w, struct nfsd4_callback, cb_work);
+ struct nfs4_delegation *dp = container_of(c, struct nfs4_delegation, dl_recall);
+
+ _nfsd4_cb_recall(dp);
+}
+
+
+void nfsd4_cb_recall(struct nfs4_delegation *dp)
+{
+ queue_work(callback_wq, &dp->dl_recall.cb_work);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff