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SUNRPC: Add a transport callback to handle dequeuing of an RPC request 

Add a transport level callback to allow it to handle the consequences of
dequeuing the request that was in the process of being transmitted.
For something like a TCP connection, we may need to disconnect if the
request was partially transmitted.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2023-12-12 16:13:22 +01:00
parent 0c14584cdb
commit 3f7edeac0b
3 changed files with 20 additions and 0 deletions
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1
include/linux/sunrpc/xprt.h
View File

@ -152,6 +152,7 @@ struct rpc_xprt_ops {
int (*prepare_request)(struct rpc_rqst *req,
struct xdr_buf *buf);
int (*send_request)(struct rpc_rqst *req);
void (*abort_send_request)(struct rpc_rqst *req);
void (*wait_for_reply_request)(struct rpc_task *task);
void (*timer)(struct rpc_xprt *xprt, struct rpc_task *task);
void (*release_request)(struct rpc_task *task);

6
net/sunrpc/xprt.c
View File

@ -1398,6 +1398,12 @@ xprt_request_dequeue_transmit_locked(struct rpc_task *task)
if (!test_and_clear_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate))
return;
if (!list_empty(&req->rq_xmit)) {
struct rpc_xprt *xprt = req->rq_xprt;
if (list_is_first(&req->rq_xmit, &xprt->xmit_queue) &&
xprt->ops->abort_send_request)
xprt->ops->abort_send_request(req);
list_del(&req->rq_xmit);
if (!list_empty(&req->rq_xmit2)) {
struct rpc_rqst *next = list_first_entry(&req->rq_xmit2,

13
net/sunrpc/xprtsock.c
View File

@ -884,6 +884,17 @@ static int xs_stream_prepare_request(struct rpc_rqst *req, struct xdr_buf *buf)
return xdr_alloc_bvec(buf, rpc_task_gfp_mask());
}
static void xs_stream_abort_send_request(struct rpc_rqst *req)
{
struct rpc_xprt *xprt = req->rq_xprt;
struct sock_xprt *transport =
container_of(xprt, struct sock_xprt, xprt);
if (transport->xmit.offset != 0 &&
!test_bit(XPRT_CLOSE_WAIT, &xprt->state))
xprt_force_disconnect(xprt);
}
/*
* Determine if the previous message in the stream was aborted before it
* could complete transmission.
@ -3029,6 +3040,7 @@ static const struct rpc_xprt_ops xs_local_ops = {
.buf_free = rpc_free,
.prepare_request = xs_stream_prepare_request,
.send_request = xs_local_send_request,
.abort_send_request = xs_stream_abort_send_request,
.wait_for_reply_request = xprt_wait_for_reply_request_def,
.close = xs_close,
.destroy = xs_destroy,
@ -3076,6 +3088,7 @@ static const struct rpc_xprt_ops xs_tcp_ops = {
.buf_free = rpc_free,
.prepare_request = xs_stream_prepare_request,
.send_request = xs_tcp_send_request,
.abort_send_request = xs_stream_abort_send_request,
.wait_for_reply_request = xprt_wait_for_reply_request_def,
.close = xs_tcp_shutdown,
.destroy = xs_destroy,