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>

1 files changed, 9 insertions, 2 deletions

diff --git a/include/linux/sunrpc/svcsock.h b/include/linux/sunrpc/svcsock.h
index 613cf42227aa..62fd1b756e99 100644
--- a/include/linux/sunrpc/svcsock.h
+++ b/include/linux/sunrpc/svcsock.h
@@ -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 */
 };