提交 756b9b37 编写于 作者: T Trond Myklebust

SUNRPC: Fix callback channel

The NFSv4.1 callback channel is currently broken because the receive
message will keep shrinking because the backchannel receive buffer size
never gets reset.
The easiest solution to this problem is instead of changing the receive
buffer, to rather adjust the copied request.

Fixes: 38b7631f ("nfs4: limit callback decoding to received bytes")
Cc: Benjamin Coddington <bcodding@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
上级 527e9316
......@@ -78,8 +78,7 @@ static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
p = xdr_inline_decode(xdr, nbytes);
if (unlikely(p == NULL))
printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed "
"or truncated request.\n");
printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
return p;
}
......@@ -890,7 +889,6 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r
struct cb_compound_hdr_arg hdr_arg = { 0 };
struct cb_compound_hdr_res hdr_res = { NULL };
struct xdr_stream xdr_in, xdr_out;
struct xdr_buf *rq_arg = &rqstp->rq_arg;
__be32 *p, status;
struct cb_process_state cps = {
.drc_status = 0,
......@@ -902,8 +900,7 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r
dprintk("%s: start\n", __func__);
rq_arg->len = rq_arg->head[0].iov_len + rq_arg->page_len;
xdr_init_decode(&xdr_in, rq_arg, rq_arg->head[0].iov_base);
xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
......
......@@ -353,20 +353,12 @@ void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied)
{
struct rpc_xprt *xprt = req->rq_xprt;
struct svc_serv *bc_serv = xprt->bc_serv;
struct xdr_buf *rq_rcv_buf = &req->rq_rcv_buf;
spin_lock(&xprt->bc_pa_lock);
list_del(&req->rq_bc_pa_list);
xprt_dec_alloc_count(xprt, 1);
spin_unlock(&xprt->bc_pa_lock);
if (copied <= rq_rcv_buf->head[0].iov_len) {
rq_rcv_buf->head[0].iov_len = copied;
rq_rcv_buf->page_len = 0;
} else {
rq_rcv_buf->page_len = copied - rq_rcv_buf->head[0].iov_len;
}
req->rq_private_buf.len = copied;
set_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
......
......@@ -1363,7 +1363,19 @@ bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req,
memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen);
memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg));
memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res));
/* Adjust the argument buffer length */
rqstp->rq_arg.len = req->rq_private_buf.len;
if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
rqstp->rq_arg.page_len = 0;
} else if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len +
rqstp->rq_arg.page_len)
rqstp->rq_arg.page_len = rqstp->rq_arg.len -
rqstp->rq_arg.head[0].iov_len;
else
rqstp->rq_arg.len = rqstp->rq_arg.head[0].iov_len +
rqstp->rq_arg.page_len;
/* reset result send buffer "put" position */
resv->iov_len = 0;
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册