Add a bvec array to struct xdr_buf, and have the client allocate it
when we need to receive data into pages.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
include/linux/sunrpc/xdr.h | 7 +++++++
include/linux/sunrpc/xprt.h | 2 ++
net/sunrpc/clnt.c | 4 +++-
net/sunrpc/xdr.c | 34 ++++++++++++++++++++++++++++++++++
net/sunrpc/xprt.c | 17 +++++++++++++++++
5 files changed, 63 insertions(+), 1 deletion(-)
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index 431829233392..745587132a87 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -18,6 +18,7 @@
#include <asm/unaligned.h>
#include <linux/scatterlist.h>
+struct bio_vec;
struct rpc_rqst;
/*
@@ -52,6 +53,7 @@ struct xdr_buf {
struct kvec head[1], /* RPC header + non-page data */
tail[1]; /* Appended after page data */
+ struct bio_vec *bvec;
struct page ** pages; /* Array of pages */
unsigned int page_base, /* Start of page data */
page_len, /* Length of page data */
@@ -70,6 +72,8 @@ xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
buf->head[0].iov_base = start;
buf->head[0].iov_len = len;
buf->tail[0].iov_len = 0;
+ buf->bvec = NULL;
+ buf->pages = NULL;
buf->page_len = 0;
buf->flags = 0;
buf->len = 0;
@@ -116,6 +120,9 @@ __be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
void xdr_inline_pages(struct xdr_buf *, unsigned int,
struct page **, unsigned int, unsigned int);
void xdr_terminate_string(struct xdr_buf *, const u32);
+size_t xdr_buf_pagecount(struct xdr_buf *buf);
+int xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp);
+void xdr_free_bvec(struct xdr_buf *buf);
static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
{
diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index 9be399020dab..a4ab4f8d9140 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -141,6 +141,7 @@ struct rpc_xprt_ops {
void (*connect)(struct rpc_xprt *xprt, struct rpc_task *task);
int (*buf_alloc)(struct rpc_task *task);
void (*buf_free)(struct rpc_task *task);
+ void (*prepare_request)(struct rpc_rqst *req);
int (*send_request)(struct rpc_rqst *req);
void (*set_retrans_timeout)(struct rpc_task *task);
void (*timer)(struct rpc_xprt *xprt, struct rpc_task *task);
@@ -343,6 +344,7 @@ int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
void xprt_free_slot(struct rpc_xprt *xprt,
struct rpc_rqst *req);
+void xprt_request_prepare(struct rpc_rqst *req);
bool xprt_prepare_transmit(struct rpc_task *task);
void xprt_request_enqueue_transmit(struct rpc_task *task);
void xprt_request_enqueue_receive(struct rpc_task *task);
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 0c4b2e7d791f..ae3b8145da35 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1753,6 +1753,8 @@ rpc_xdr_encode(struct rpc_task *task)
task->tk_status = rpcauth_wrap_req(task, encode, req, p,
task->tk_msg.rpc_argp);
+ if (task->tk_status == 0)
+ xprt_request_prepare(req);
}
/*
@@ -1768,7 +1770,7 @@ call_encode(struct rpc_task *task)
/* Did the encode result in an error condition? */
if (task->tk_status != 0) {
/* Was the error nonfatal? */
- if (task->tk_status == -EAGAIN)
+ if (task->tk_status == -EAGAIN || task->tk_status == -ENOMEM)
rpc_delay(task, HZ >> 4);
else
rpc_exit(task, task->tk_status);
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 30afbd236656..2bbb8d38d2bf 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -15,6 +15,7 @@
#include <linux/errno.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/msg_prot.h>
+#include <linux/bvec.h>
/*
* XDR functions for basic NFS types
@@ -128,6 +129,39 @@ xdr_terminate_string(struct xdr_buf *buf, const u32 len)
}
EXPORT_SYMBOL_GPL(xdr_terminate_string);
+size_t
+xdr_buf_pagecount(struct xdr_buf *buf)
+{
+ if (!buf->page_len)
+ return 0;
+ return (buf->page_base + buf->page_len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+}
+
+int
+xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp)
+{
+ size_t i, n = xdr_buf_pagecount(buf);
+
+ if (n != 0 && buf->bvec == NULL) {
+ buf->bvec = kmalloc_array(n, sizeof(buf->bvec[0]), gfp);
+ if (!buf->bvec)
+ return -ENOMEM;
+ for (i = 0; i < n; i++) {
+ buf->bvec[i].bv_page = buf->pages[i];
+ buf->bvec[i].bv_len = PAGE_SIZE;
+ buf->bvec[i].bv_offset = 0;
+ }
+ }
+ return 0;
+}
+
+void
+xdr_free_bvec(struct xdr_buf *buf)
+{
+ kfree(buf->bvec);
+ buf->bvec = NULL;
+}
+
void
xdr_inline_pages(struct xdr_buf *xdr, unsigned int offset,
struct page **pages, unsigned int base, unsigned int len)
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index d1a67e97e7d3..547519f25878 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -1262,6 +1262,22 @@ xprt_request_dequeue_transmit(struct rpc_task *task)
spin_unlock(&xprt->queue_lock);
}
+/**
+ * xprt_request_prepare - prepare an encoded request for transport
+ * @req: pointer to rpc_rqst
+ *
+ * Calls into the transport layer to do whatever is needed to prepare
+ * the request for transmission or receive.
+ */
+void
+xprt_request_prepare(struct rpc_rqst *req)
+{
+ struct rpc_xprt *xprt = req->rq_xprt;
+
+ if (xprt->ops->prepare_request)
+ xprt->ops->prepare_request(req);
+}
+
/**
* xprt_request_need_retransmit - Test if a task needs retransmission
* @task: pointer to rpc_task
@@ -1726,6 +1742,7 @@ void xprt_release(struct rpc_task *task)
if (req->rq_buffer)
xprt->ops->buf_free(task);
xprt_inject_disconnect(xprt);
+ xdr_free_bvec(&req->rq_rcv_buf);
if (req->rq_cred != NULL)
put_rpccred(req->rq_cred);
task->tk_rqstp = NULL;
--
2.17.1
