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svcrpc: track rpc data length separately from sk_tcplen 

Keep a separate field, sk_datalen, that tracks only the data contained
in a fragment, not including the fragment header.

For now, this is always just max(0, sk_tcplen - 4), but after we allow
multiple fragments sk_datalen will accumulate the total rpc data size
while sk_tcplen only tracks progress receiving the current fragment.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2012-12-03 16:45:35 -05:00
parent 6a72ae2e23
commit 8af345f58a
2 changed files with 21 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/linux/sunrpc/svcsock.h
View File

@ -26,8 +26,15 @@ struct svc_sock {
void (*sk_owspace)(struct sock *);
/* private TCP part */
__be32 sk_reclen; /* length of record */
u32 sk_tcplen; /* current read length */
/* On-the-wire fragment header: */
__be32 sk_reclen;
/* As we receive a record, this includes the length received so
* far (including the fragment header): */
u32 sk_tcplen;
/* Total length of the data (not including fragment headers)
* received so far in the fragments making up this rpc: */
u32 sk_datalen;
struct page * sk_pages[RPCSVC_MAXPAGES]; /* received data */
};

19
net/sunrpc/svcsock.c
View File

@ -874,9 +874,9 @@ static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst
{
unsigned int i, len, npages;
if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
if (svsk->sk_datalen == 0)
return 0;
len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
len = svsk->sk_datalen;
npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
for (i = 0; i < npages; i++) {
if (rqstp->rq_pages[i] != NULL)
@ -893,9 +893,9 @@ static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
{
unsigned int i, len, npages;
if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
if (svsk->sk_datalen == 0)
return;
len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
len = svsk->sk_datalen;
npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
for (i = 0; i < npages; i++) {
svsk->sk_pages[i] = rqstp->rq_pages[i];
@ -907,9 +907,9 @@ static void svc_tcp_clear_pages(struct svc_sock *svsk)
{
unsigned int i, len, npages;
if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
if (svsk->sk_datalen == 0)
goto out;
len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
len = svsk->sk_datalen;
npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
for (i = 0; i < npages; i++) {
BUG_ON(svsk->sk_pages[i] == NULL);
@ -918,6 +918,7 @@ static void svc_tcp_clear_pages(struct svc_sock *svsk)
}
out:
svsk->sk_tcplen = 0;
svsk->sk_datalen = 0;
}
/*
@ -1066,8 +1067,10 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
/* Now receive data */
len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
if (len >= 0)
if (len >= 0) {
svsk->sk_tcplen += len;
svsk->sk_datalen += len;
}
if (len != want) {
svc_tcp_save_pages(svsk, rqstp);
if (len < 0 && len != -EAGAIN)
@ -1100,6 +1103,7 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
/* Reset TCP read info */
svsk->sk_reclen = 0;
svsk->sk_tcplen = 0;
svsk->sk_datalen = 0;
/* If we have more data, signal svc_xprt_enqueue() to try again */
if (svc_recv_available(svsk) > sizeof(rpc_fraghdr))
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
@ -1296,6 +1300,7 @@ static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
svsk->sk_reclen = 0;
svsk->sk_tcplen = 0;
svsk->sk_datalen = 0;
memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;