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SUNRPC: Convert socket page send code to use iov_iter() 

Simplify the page send code using iov_iter and bvecs.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2019-02-19 13:00:13 -05:00
parent e791f8e938
commit 0472e47660
2 changed files with 14 additions and 36 deletions
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1
net/sunrpc/xprt.c
View File

@ -1723,6 +1723,7 @@ void xprt_release(struct rpc_task *task)
xprt->ops->buf_free(task);
xprt_inject_disconnect(xprt);
xdr_free_bvec(&req->rq_rcv_buf);
xdr_free_bvec(&req->rq_snd_buf);
if (req->rq_cred != NULL)
put_rpccred(req->rq_cred);
task->tk_rqstp = NULL;

49
net/sunrpc/xprtsock.c
View File

@ -759,42 +759,18 @@ static int xs_send_kvec(struct socket *sock, struct msghdr *msg, struct kvec *ve
return xs_sendmsg(sock, msg, seek);
}
static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
static int xs_send_pagedata(struct socket *sock, struct msghdr *msg, struct xdr_buf *xdr, size_t base)
{
ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
int offset, size_t size, int flags);
struct page **ppage;
unsigned int remainder;
int err;
remainder = xdr->page_len - base;
base += xdr->page_base;
ppage = xdr->pages + (base >> PAGE_SHIFT);
base &= ~PAGE_MASK;
do_sendpage = sock->ops->sendpage;
if (!zerocopy)
do_sendpage = sock_no_sendpage;
for(;;) {
unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
int flags = XS_SENDMSG_FLAGS;
err = xdr_alloc_bvec(xdr, GFP_KERNEL);
if (err < 0)
return err;
remainder -= len;
if (more)
flags |= MSG_MORE;
if (remainder != 0)
flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE;
err = do_sendpage(sock, *ppage, base, len, flags);
if (remainder == 0 || err != len)
break;
*sent_p += err;
ppage++;
base = 0;
}
if (err > 0) {
*sent_p += err;
err = 0;
}
return err;
iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec,
xdr_buf_pagecount(xdr),
xdr->page_len + xdr->page_base);
return xs_sendmsg(sock, msg, base + xdr->page_base);
}
/**
@ -817,7 +793,6 @@ static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen,
};
unsigned int remainder = xdr->len - base;
int err = 0;
int sent = 0;
if (unlikely(!sock))
return -ENOTSOCK;
@ -843,10 +818,12 @@ static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen,
if (base < xdr->page_len) {
unsigned int len = xdr->page_len - base;
remainder -= len;
err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
*sent_p += sent;
if (remainder == 0 || sent != len)
if (remainder == 0)
msg.msg_flags &= ~MSG_MORE;
err = xs_send_pagedata(sock, &msg, xdr, base);
if (remainder == 0 || err != len)
goto out;
*sent_p += err;
base = 0;
} else
base -= xdr->page_len;