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SUNRPC: Fix up the back channel transmit 

Fix up the back channel code to recognise that it has already been
transmitted, so does not need to be called again.
Also ensure that we set req->rq_task.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2018-09-01 17:21:01 -04:00
parent 762e4e67b3
commit 902c58872e
3 changed files with 32 additions and 15 deletions
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1
include/linux/sunrpc/bc_xprt.h
View File

@ -34,6 +34,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifdef CONFIG_SUNRPC_BACKCHANNEL
struct rpc_rqst *xprt_lookup_bc_request(struct rpc_xprt *xprt, __be32 xid);
void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied);
void xprt_init_bc_request(struct rpc_rqst *req, struct rpc_task *task);
void xprt_free_bc_request(struct rpc_rqst *req);
int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
void xprt_destroy_backchannel(struct rpc_xprt *, unsigned int max_reqs);

19
net/sunrpc/clnt.c
View File

@ -1138,7 +1138,6 @@ EXPORT_SYMBOL_GPL(rpc_call_async);
struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req)
{
struct rpc_task *task;
struct xdr_buf *xbufp = &req->rq_snd_buf;
struct rpc_task_setup task_setup_data = {
.callback_ops = &rpc_default_ops,
.flags = RPC_TASK_SOFTCONN |
@ -1150,14 +1149,7 @@ struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req)
* Create an rpc_task to send the data
*/
task = rpc_new_task(&task_setup_data);
task->tk_rqstp = req;
/*
* Set up the xdr_buf length.
* This also indicates that the buffer is XDR encoded already.
*/
xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
xbufp->tail[0].iov_len;
xprt_init_bc_request(req, task);
task->tk_action = call_bc_transmit;
atomic_inc(&task->tk_count);
@ -2064,6 +2056,8 @@ call_bc_transmit(struct rpc_task *task)
if (rpc_task_need_encode(task))
xprt_request_enqueue_transmit(task);
if (!test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate))
goto out_wakeup;
if (!xprt_prepare_transmit(task))
goto out_retry;
@ -2073,13 +2067,11 @@ call_bc_transmit(struct rpc_task *task)
"error: %d\n", task->tk_status);
goto out_done;
}
if (req->rq_connect_cookie != req->rq_xprt->connect_cookie)
req->rq_bytes_sent = 0;
xprt_transmit(task);
if (task->tk_status == -EAGAIN)
goto out_nospace;
goto out_retry;
xprt_end_transmit(task);
dprint_status(task);
@ -2119,12 +2111,11 @@ call_bc_transmit(struct rpc_task *task)
"error: %d\n", task->tk_status);
break;
}
out_wakeup:
rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
out_done:
task->tk_action = rpc_exit_task;
return;
out_nospace:
req->rq_connect_cookie = req->rq_xprt->connect_cookie;
out_retry:
task->tk_status = 0;
}

27
net/sunrpc/xprt.c
View File

@ -1390,6 +1390,12 @@ void xprt_free(struct rpc_xprt *xprt)
}
EXPORT_SYMBOL_GPL(xprt_free);
static void
xprt_init_connect_cookie(struct rpc_rqst *req, struct rpc_xprt *xprt)
{
req->rq_connect_cookie = xprt_connect_cookie(xprt) - 1;
}
static __be32
xprt_alloc_xid(struct rpc_xprt *xprt)
{
@ -1418,7 +1424,7 @@ xprt_request_init(struct rpc_task *task)
req->rq_xprt = xprt;
req->rq_buffer = NULL;
req->rq_xid = xprt_alloc_xid(xprt);
req->rq_connect_cookie = xprt_connect_cookie(xprt) - 1;
xprt_init_connect_cookie(req, xprt);
req->rq_bytes_sent = 0;
req->rq_snd_buf.len = 0;
req->rq_snd_buf.buflen = 0;
@ -1552,6 +1558,25 @@ void xprt_release(struct rpc_task *task)
xprt_free_bc_request(req);
}
#ifdef CONFIG_SUNRPC_BACKCHANNEL
void
xprt_init_bc_request(struct rpc_rqst *req, struct rpc_task *task)
{
struct xdr_buf *xbufp = &req->rq_snd_buf;
task->tk_rqstp = req;
req->rq_task = task;
xprt_init_connect_cookie(req, req->rq_xprt);
/*
* Set up the xdr_buf length.
* This also indicates that the buffer is XDR encoded already.
*/
xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
xbufp->tail[0].iov_len;
req->rq_bytes_sent = 0;
}
#endif
static void xprt_init(struct rpc_xprt *xprt, struct net *net)
{
kref_init(&xprt->kref);