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SUNRPC: Don't reuse bvec on retransmission of the request 

If a request is re-encoded and then retransmitted, we need to make sure
that we also re-encode the bvec, in case the page lists have changed.

Fixes: ff053dbbaf ("SUNRPC: Move the call to xprt_send_pagedata() out of xprt_sock_sendmsg()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2022-07-27 13:02:27 -04:00
parent 6622e3a731
commit 72691a269f
4 changed files with 22 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/sunrpc/xprt.h
View File

@ -144,7 +144,8 @@ struct rpc_xprt_ops {
unsigned short (*get_srcport)(struct rpc_xprt *xprt);
int (*buf_alloc)(struct rpc_task *task);
void (*buf_free)(struct rpc_task *task);
int (*prepare_request)(struct rpc_rqst *req);
int (*prepare_request)(struct rpc_rqst *req,
struct xdr_buf *buf);
int (*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);

1
net/sunrpc/clnt.c
View File

@ -1870,7 +1870,6 @@ rpc_xdr_encode(struct rpc_task *task)
req->rq_snd_buf.head[0].iov_len = 0;
xdr_init_encode(&xdr, &req->rq_snd_buf,
req->rq_snd_buf.head[0].iov_base, req);
xdr_free_bvec(&req->rq_snd_buf);
if (rpc_encode_header(task, &xdr))
return;

27
net/sunrpc/xprt.c
View File

@ -73,7 +73,7 @@ static void xprt_init(struct rpc_xprt *xprt, struct net *net);
static __be32 xprt_alloc_xid(struct rpc_xprt *xprt);
static void xprt_destroy(struct rpc_xprt *xprt);
static void xprt_request_init(struct rpc_task *task);
static int xprt_request_prepare(struct rpc_rqst *req);
static int xprt_request_prepare(struct rpc_rqst *req, struct xdr_buf *buf);
static DEFINE_SPINLOCK(xprt_list_lock);
static LIST_HEAD(xprt_list);
@ -1149,7 +1149,7 @@ xprt_request_enqueue_receive(struct rpc_task *task)
if (!xprt_request_need_enqueue_receive(task, req))
return 0;
ret = xprt_request_prepare(task->tk_rqstp);
ret = xprt_request_prepare(task->tk_rqstp, &req->rq_rcv_buf);
if (ret)
return ret;
spin_lock(&xprt->queue_lock);
@ -1179,8 +1179,11 @@ xprt_request_dequeue_receive_locked(struct rpc_task *task)
{
struct rpc_rqst *req = task->tk_rqstp;
if (test_and_clear_bit(RPC_TASK_NEED_RECV, &task->tk_runstate))
if (test_and_clear_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) {
xprt_request_rb_remove(req->rq_xprt, req);
xdr_free_bvec(&req->rq_rcv_buf);
req->rq_private_buf.bvec = NULL;
}
}
/**
@ -1336,8 +1339,14 @@ xprt_request_enqueue_transmit(struct rpc_task *task)
{
struct rpc_rqst *pos, *req = task->tk_rqstp;
struct rpc_xprt *xprt = req->rq_xprt;
int ret;
if (xprt_request_need_enqueue_transmit(task, req)) {
ret = xprt_request_prepare(task->tk_rqstp, &req->rq_snd_buf);
if (ret) {
task->tk_status = ret;
return;
}
req->rq_bytes_sent = 0;
spin_lock(&xprt->queue_lock);
/*
@ -1397,6 +1406,7 @@ xprt_request_dequeue_transmit_locked(struct rpc_task *task)
} else
list_del(&req->rq_xmit2);
atomic_long_dec(&req->rq_xprt->xmit_queuelen);
xdr_free_bvec(&req->rq_snd_buf);
}
/**
@ -1433,8 +1443,6 @@ xprt_request_dequeue_xprt(struct rpc_task *task)
test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate) ||
xprt_is_pinned_rqst(req)) {
spin_lock(&xprt->queue_lock);
xprt_request_dequeue_transmit_locked(task);
xprt_request_dequeue_receive_locked(task);
while (xprt_is_pinned_rqst(req)) {
set_bit(RPC_TASK_MSG_PIN_WAIT, &task->tk_runstate);
spin_unlock(&xprt->queue_lock);
@ -1442,6 +1450,8 @@ xprt_request_dequeue_xprt(struct rpc_task *task)
spin_lock(&xprt->queue_lock);
clear_bit(RPC_TASK_MSG_PIN_WAIT, &task->tk_runstate);
}
xprt_request_dequeue_transmit_locked(task);
xprt_request_dequeue_receive_locked(task);
spin_unlock(&xprt->queue_lock);
}
}
@ -1449,18 +1459,19 @@ xprt_request_dequeue_xprt(struct rpc_task *task)
/**
* xprt_request_prepare - prepare an encoded request for transport
* @req: pointer to rpc_rqst
* @buf: pointer to send/rcv xdr_buf
*
* Calls into the transport layer to do whatever is needed to prepare
* the request for transmission or receive.
* Returns error, or zero.
*/
static int
xprt_request_prepare(struct rpc_rqst *req)
xprt_request_prepare(struct rpc_rqst *req, struct xdr_buf *buf)
{
struct rpc_xprt *xprt = req->rq_xprt;
if (xprt->ops->prepare_request)
return xprt->ops->prepare_request(req);
return xprt->ops->prepare_request(req, buf);
return 0;
}
@ -1961,8 +1972,6 @@ void xprt_release(struct rpc_task *task)
spin_unlock(&xprt->transport_lock);
if (req->rq_buffer)
xprt->ops->buf_free(task);
xdr_free_bvec(&req->rq_rcv_buf);
xdr_free_bvec(&req->rq_snd_buf);
if (req->rq_cred != NULL)
put_rpccred(req->rq_cred);
if (req->rq_release_snd_buf)

12
net/sunrpc/xprtsock.c
View File

@ -822,17 +822,9 @@ static int xs_stream_nospace(struct rpc_rqst *req, bool vm_wait)
return ret;
}
static int
xs_stream_prepare_request(struct rpc_rqst *req)
static int xs_stream_prepare_request(struct rpc_rqst *req, struct xdr_buf *buf)
{
gfp_t gfp = rpc_task_gfp_mask();
int ret;
ret = xdr_alloc_bvec(&req->rq_snd_buf, gfp);
if (ret < 0)
return ret;
xdr_free_bvec(&req->rq_rcv_buf);
return xdr_alloc_bvec(&req->rq_rcv_buf, gfp);
return xdr_alloc_bvec(buf, rpc_task_gfp_mask());
}
/*