* - Next, the caller puts together the RPC message, stuffs it into
* the request struct, and calls xprt_transmit().
* - xprt_transmit sends the message and installs the caller on the
- * transport's wait list. At the same time, it installs a timer that
- * is run after the packet's timeout has expired.
+ * transport's wait list. At the same time, if a reply is expected,
+ * it installs a timer that is run after the packet's timeout has
+ * expired.
* - When a packet arrives, the data_ready handler walks the list of
* pending requests for that transport. If a matching XID is found, the
* caller is woken up, and the timer removed.
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/net.h>
+#include <linux/ktime.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/metrics.h>
+#include <linux/sunrpc/bc_xprt.h>
+
+#include "sunrpc.h"
/*
* Local variables
* Local functions
*/
static void xprt_request_init(struct rpc_task *, struct rpc_xprt *);
-static inline void do_xprt_reserve(struct rpc_task *);
static void xprt_connect_status(struct rpc_task *task);
static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *);
*/
int xprt_reserve_xprt(struct rpc_task *task)
{
- struct rpc_xprt *xprt = task->tk_xprt;
struct rpc_rqst *req = task->tk_rqstp;
+ struct rpc_xprt *xprt = req->rq_xprt;
if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) {
if (task == xprt->snd_task)
dprintk("RPC: disconnected transport %p\n", xprt);
spin_lock_bh(&xprt->transport_lock);
xprt_clear_connected(xprt);
- xprt_wake_pending_tasks(xprt, -ENOTCONN);
+ xprt_wake_pending_tasks(xprt, -EAGAIN);
spin_unlock_bh(&xprt->transport_lock);
}
EXPORT_SYMBOL_GPL(xprt_disconnect_done);
/* Try to schedule an autoclose RPC call */
if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
queue_work(rpciod_workqueue, &xprt->task_cleanup);
- xprt_wake_pending_tasks(xprt, -ENOTCONN);
+ xprt_wake_pending_tasks(xprt, -EAGAIN);
spin_unlock_bh(&xprt->transport_lock);
}
/* Try to schedule an autoclose RPC call */
if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
queue_work(rpciod_workqueue, &xprt->task_cleanup);
- xprt_wake_pending_tasks(xprt, -ENOTCONN);
+ xprt_wake_pending_tasks(xprt, -EAGAIN);
out:
spin_unlock_bh(&xprt->transport_lock);
}
if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
goto out_abort;
spin_unlock(&xprt->transport_lock);
- if (xprt_connecting(xprt))
- xprt_release_write(xprt, NULL);
- else
- queue_work(rpciod_workqueue, &xprt->task_cleanup);
+ set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
+ queue_work(rpciod_workqueue, &xprt->task_cleanup);
return;
out_abort:
spin_unlock(&xprt->transport_lock);
}
if (!xprt_lock_write(xprt, task))
return;
+
+ if (test_and_clear_bit(XPRT_CLOSE_WAIT, &xprt->state))
+ xprt->ops->close(xprt);
+
if (xprt_connected(xprt))
xprt_release_write(xprt, task);
else {
if (task->tk_rqstp)
task->tk_rqstp->rq_bytes_sent = 0;
- task->tk_timeout = xprt->connect_timeout;
+ task->tk_timeout = task->tk_rqstp->rq_timeout;
rpc_sleep_on(&xprt->pending, task, xprt_connect_status);
+
+ if (test_bit(XPRT_CLOSING, &xprt->state))
+ return;
+ if (xprt_test_and_set_connecting(xprt))
+ return;
xprt->stat.connect_start = jiffies;
xprt->ops->connect(task);
}
- return;
}
static void xprt_connect_status(struct rpc_task *task)
}
switch (task->tk_status) {
- case -ENOTCONN:
- dprintk("RPC: %5u xprt_connect_status: connection broken\n",
- task->tk_pid);
+ case -EAGAIN:
+ dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid);
break;
case -ETIMEDOUT:
dprintk("RPC: %5u xprt_connect_status: connect attempt timed "
}
EXPORT_SYMBOL_GPL(xprt_lookup_rqst);
-/**
- * xprt_update_rtt - update an RPC client's RTT state after receiving a reply
- * @task: RPC request that recently completed
- *
- */
-void xprt_update_rtt(struct rpc_task *task)
+static void xprt_update_rtt(struct rpc_task *task)
{
struct rpc_rqst *req = task->tk_rqstp;
struct rpc_rtt *rtt = task->tk_client->cl_rtt;
unsigned timer = task->tk_msg.rpc_proc->p_timer;
+ long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt));
if (timer) {
if (req->rq_ntrans == 1)
- rpc_update_rtt(rtt, timer,
- (long)jiffies - req->rq_xtime);
+ rpc_update_rtt(rtt, timer, m);
rpc_set_timeo(rtt, timer, req->rq_ntrans - 1);
}
}
-EXPORT_SYMBOL_GPL(xprt_update_rtt);
/**
* xprt_complete_rqst - called when reply processing is complete
task->tk_pid, ntohl(req->rq_xid), copied);
xprt->stat.recvs++;
- task->tk_rtt = (long)jiffies - req->rq_xtime;
+ req->rq_rtt = ktime_sub(ktime_get(), req->rq_xtime);
+ if (xprt->ops->timer != NULL)
+ xprt_update_rtt(task);
list_del_init(&req->rq_list);
req->rq_private_buf.len = copied;
- /* Ensure all writes are done before we update req->rq_received */
+ /* Ensure all writes are done before we update */
+ /* req->rq_reply_bytes_recvd */
smp_wmb();
- req->rq_received = copied;
+ req->rq_reply_bytes_recvd = copied;
rpc_wake_up_queued_task(&xprt->pending, task);
}
EXPORT_SYMBOL_GPL(xprt_complete_rqst);
dprintk("RPC: %5u xprt_timer\n", task->tk_pid);
spin_lock_bh(&xprt->transport_lock);
- if (!req->rq_received) {
+ if (!req->rq_reply_bytes_recvd) {
if (xprt->ops->timer)
xprt->ops->timer(task);
} else
spin_unlock_bh(&xprt->transport_lock);
}
+static inline int xprt_has_timer(struct rpc_xprt *xprt)
+{
+ return xprt->idle_timeout != 0;
+}
+
/**
* xprt_prepare_transmit - reserve the transport before sending a request
* @task: RPC task about to send a request
dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid);
spin_lock_bh(&xprt->transport_lock);
- if (req->rq_received && !req->rq_bytes_sent) {
- err = req->rq_received;
+ if (req->rq_reply_bytes_recvd && !req->rq_bytes_sent) {
+ err = req->rq_reply_bytes_recvd;
goto out_unlock;
}
- if (!xprt->ops->reserve_xprt(task)) {
+ if (!xprt->ops->reserve_xprt(task))
err = -EAGAIN;
- goto out_unlock;
- }
-
- if (!xprt_connected(xprt)) {
- err = -ENOTCONN;
- goto out_unlock;
- }
out_unlock:
spin_unlock_bh(&xprt->transport_lock);
return err;
void xprt_end_transmit(struct rpc_task *task)
{
- xprt_release_write(task->tk_xprt, task);
+ xprt_release_write(task->tk_rqstp->rq_xprt, task);
}
/**
dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen);
- if (!req->rq_received) {
- if (list_empty(&req->rq_list)) {
+ if (!req->rq_reply_bytes_recvd) {
+ if (list_empty(&req->rq_list) && rpc_reply_expected(task)) {
+ /*
+ * Add to the list only if we're expecting a reply
+ */
spin_lock_bh(&xprt->transport_lock);
/* Update the softirq receive buffer */
memcpy(&req->rq_private_buf, &req->rq_rcv_buf,
return;
req->rq_connect_cookie = xprt->connect_cookie;
- req->rq_xtime = jiffies;
+ req->rq_xtime = ktime_get();
status = xprt->ops->send_request(task);
- if (status == 0) {
- dprintk("RPC: %5u xmit complete\n", task->tk_pid);
- spin_lock_bh(&xprt->transport_lock);
-
- xprt->ops->set_retrans_timeout(task);
-
- xprt->stat.sends++;
- xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs;
- xprt->stat.bklog_u += xprt->backlog.qlen;
-
- /* Don't race with disconnect */
- if (!xprt_connected(xprt))
- task->tk_status = -ENOTCONN;
- else if (!req->rq_received)
- rpc_sleep_on(&xprt->pending, task, xprt_timer);
- spin_unlock_bh(&xprt->transport_lock);
+ if (status != 0) {
+ task->tk_status = status;
return;
}
- /* Note: at this point, task->tk_sleeping has not yet been set,
- * hence there is no danger of the waking up task being put on
- * schedq, and being picked up by a parallel run of rpciod().
- */
- task->tk_status = status;
- if (status == -ECONNREFUSED)
- rpc_sleep_on(&xprt->sending, task, NULL);
+ dprintk("RPC: %5u xmit complete\n", task->tk_pid);
+ spin_lock_bh(&xprt->transport_lock);
+
+ xprt->ops->set_retrans_timeout(task);
+
+ xprt->stat.sends++;
+ xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs;
+ xprt->stat.bklog_u += xprt->backlog.qlen;
+
+ /* Don't race with disconnect */
+ if (!xprt_connected(xprt))
+ task->tk_status = -ENOTCONN;
+ else if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task)) {
+ /*
+ * Sleep on the pending queue since
+ * we're expecting a reply.
+ */
+ rpc_sleep_on(&xprt->pending, task, xprt_timer);
+ }
+ spin_unlock_bh(&xprt->transport_lock);
}
-static inline void do_xprt_reserve(struct rpc_task *task)
+static void xprt_alloc_slot(struct rpc_task *task)
{
struct rpc_xprt *xprt = task->tk_xprt;
rpc_sleep_on(&xprt->backlog, task, NULL);
}
+static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req)
+{
+ memset(req, 0, sizeof(*req)); /* mark unused */
+
+ spin_lock(&xprt->reserve_lock);
+ list_add(&req->rq_list, &xprt->free);
+ rpc_wake_up_next(&xprt->backlog);
+ spin_unlock(&xprt->reserve_lock);
+}
+
/**
* xprt_reserve - allocate an RPC request slot
* @task: RPC task requesting a slot allocation
task->tk_status = -EIO;
spin_lock(&xprt->reserve_lock);
- do_xprt_reserve(task);
+ xprt_alloc_slot(task);
spin_unlock(&xprt->reserve_lock);
}
*/
void xprt_release(struct rpc_task *task)
{
- struct rpc_xprt *xprt = task->tk_xprt;
+ struct rpc_xprt *xprt;
struct rpc_rqst *req;
if (!(req = task->tk_rqstp))
return;
+
+ xprt = req->rq_xprt;
rpc_count_iostats(task);
spin_lock_bh(&xprt->transport_lock);
xprt->ops->release_xprt(xprt, task);
if (!list_empty(&req->rq_list))
list_del(&req->rq_list);
xprt->last_used = jiffies;
- if (list_empty(&xprt->recv))
+ if (list_empty(&xprt->recv) && xprt_has_timer(xprt))
mod_timer(&xprt->timer,
xprt->last_used + xprt->idle_timeout);
spin_unlock_bh(&xprt->transport_lock);
- xprt->ops->buf_free(req->rq_buffer);
+ if (req->rq_buffer)
+ xprt->ops->buf_free(req->rq_buffer);
task->tk_rqstp = NULL;
if (req->rq_release_snd_buf)
req->rq_release_snd_buf(req);
- memset(req, 0, sizeof(*req)); /* mark unused */
dprintk("RPC: %5u release request %p\n", task->tk_pid, req);
-
- spin_lock(&xprt->reserve_lock);
- list_add(&req->rq_list, &xprt->free);
- rpc_wake_up_next(&xprt->backlog);
- spin_unlock(&xprt->reserve_lock);
+ if (likely(!bc_prealloc(req)))
+ xprt_free_slot(xprt, req);
+ else
+ xprt_free_bc_request(req);
}
/**
INIT_LIST_HEAD(&xprt->free);
INIT_LIST_HEAD(&xprt->recv);
+#if defined(CONFIG_NFS_V4_1)
+ spin_lock_init(&xprt->bc_pa_lock);
+ INIT_LIST_HEAD(&xprt->bc_pa_list);
+#endif /* CONFIG_NFS_V4_1 */
+
INIT_WORK(&xprt->task_cleanup, xprt_autoclose);
- setup_timer(&xprt->timer, xprt_init_autodisconnect,
- (unsigned long)xprt);
+ if (xprt_has_timer(xprt))
+ setup_timer(&xprt->timer, xprt_init_autodisconnect,
+ (unsigned long)xprt);
+ else
+ init_timer(&xprt->timer);
xprt->last_used = jiffies;
xprt->cwnd = RPC_INITCWND;
xprt->bind_index = 0;
dprintk("RPC: created transport %p with %u slots\n", xprt,
xprt->max_reqs);
-
return xprt;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff