SUNRPC: Update RPC server's TCP record marker decoder

Clean up: Update the RPC server's TCP record marker decoder to match the
constructs used by the RPC client's TCP socket transport.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

diff --git a/include/linux/sunrpc/svcsock.h b/include/linux/sunrpc/svcsock.h
index 206f092..8cff696 100644 (file)
--- a/include/linux/sunrpc/svcsock.h
+++ b/include/linux/sunrpc/svcsock.h
@@ -26,8 +26,8 @@ struct svc_sock {
        void                    (*sk_owspace)(struct sock *);
 
        /* private TCP part */
-       int                     sk_reclen;      /* length of record */
-       int                     sk_tcplen;      /* current read length */
+       u32                     sk_reclen;      /* length of record */
+       u32                     sk_tcplen;      /* current read length */
 };
 
 /*

diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 8b1bda3..3e65719 100644 (file)
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -46,6 +46,7 @@
 #include <linux/sunrpc/types.h>
 #include <linux/sunrpc/clnt.h>
 #include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/msg_prot.h>
 #include <linux/sunrpc/svcsock.h>
 #include <linux/sunrpc/stats.h>
 
@@ -823,8 +824,8 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
         * the next four bytes. Otherwise try to gobble up as much as
         * possible up to the complete record length.
         */
-       if (svsk->sk_tcplen < 4) {
-               unsigned long   want = 4 - svsk->sk_tcplen;
+       if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
+               int             want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
                struct kvec     iov;
 
                iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
@@ -834,32 +835,31 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
                svsk->sk_tcplen += len;
 
                if (len < want) {
-                       dprintk("svc: short recvfrom while reading record length (%d of %lu)\n",
-                               len, want);
+                       dprintk("svc: short recvfrom while reading record "
+                               "length (%d of %d)\n", len, want);
                        svc_xprt_received(&svsk->sk_xprt);
                        return -EAGAIN; /* record header not complete */
                }
 
                svsk->sk_reclen = ntohl(svsk->sk_reclen);
-               if (!(svsk->sk_reclen & 0x80000000)) {
+               if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {
                        /* FIXME: technically, a record can be fragmented,
                         *  and non-terminal fragments will not have the top
                         *  bit set in the fragment length header.
                         *  But apparently no known nfs clients send fragmented
                         *  records. */
                        if (net_ratelimit())
-                               printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx"
-                                      " (non-terminal)\n",
-                                      (unsigned long) svsk->sk_reclen);
+                               printk(KERN_NOTICE "RPC: multiple fragments "
+                                       "per record not supported\n");
                        goto err_delete;
                }
-               svsk->sk_reclen &= 0x7fffffff;
+               svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;
                dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
                if (svsk->sk_reclen > serv->sv_max_mesg) {
                        if (net_ratelimit())
-                               printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx"
-                                      " (large)\n",
-                                      (unsigned long) svsk->sk_reclen);
+                               printk(KERN_NOTICE "RPC: "
+                                       "fragment too large: 0x%08lx\n",
+                                       (unsigned long)svsk->sk_reclen);
                        goto err_delete;
                }
        }