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SubjectRe: Odd log message associated with NFS
From
On Wed, Mar 28, 2007 at 07:05:36PM +0000, Thorsten Kranzkowski wrote:
> I'll let a tcpdump run this evening and see if I can correlate the message
> with anything.
> If you have a printk or other patch for me to try, just let me know.

Well, just for fun, you could try something like this--should dump some
data the first time it hits the "bad direction" error.

--b.

diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index 9e340fa..c2349d2 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -35,6 +35,45 @@ struct xdr_netobj {
*/
typedef int (*kxdrproc_t)(void *rqstp, __be32 *data, void *obj);

+/* dump the buffer in `emacs-hexl' style */
+#define isprintable(c) ((c > 0x1f) && (c < 0x7f))
+
+static inline void dump_hex(void *p, u_int length)
+{
+ u_int i, j, jm;
+ u8 c, *cp;
+
+ printk("RPC: print_hexl: length %d\n",length);
+ cp = p;
+
+ for (i = 0; i < length; i += 0x10) {
+ printk(" %04x: ", (u_int)i);
+ jm = length - i;
+ jm = jm > 16 ? 16 : jm;
+
+ for (j = 0; j < jm; j++) {
+ if ((j % 2) == 1)
+ printk("%02x ", (u_int)cp[i+j]);
+ else
+ printk("%02x", (u_int)cp[i+j]);
+ }
+ for (; j < 16; j++) {
+ if ((j % 2) == 1)
+ printk(" ");
+ else
+ printk(" ");
+ }
+ printk(" ");
+
+ for (j = 0; j < jm; j++) {
+ c = cp[i+j];
+ c = isprintable(c) ? c : '.';
+ printk("%c", c);
+ }
+ printk("\n");
+ }
+}
+
/*
* Basic structure for transmission/reception of a client XDR message.
* Features a header (for a linear buffer containing RPC headers
@@ -61,6 +100,18 @@ struct xdr_buf {

};

+static inline void dump_xdr_buf(struct xdr_buf *buf)
+{
+ printk("buf->head[0].iov_base = %p, buf->head[0].iov_len = %d\n",
+ buf->head[0].iov_base, buf->head[0].iov_len);
+ printk("buf->tail[0].iov_base = %p, buf->tail[0].iov_len = %d\n",
+ buf->tail[0].iov_base, buf->tail[0].iov_len);
+ printk("pages = %p, page_base = %d, page_len = %d\n",
+ buf->pages, buf->page_base, buf->page_len);
+ printk("buflen = %d, len = %d\n", buf->buflen, buf->len);
+ return;
+}
+
/*
* pre-xdr'ed macros.
*/
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index b4db53f..977056e 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -776,6 +776,26 @@ svc_register(struct svc_serv *serv, int proto, unsigned short port)
return error;
}

+static void
+dump_once(struct svc_rqst *rqstp, __be32 *orig_start)
+{
+ static int done = 0;
+ struct kvec *argv = &rqstp->rq_arg.head[0];
+ char buf[RPC_MAX_ADDRBUFLEN];
+
+ if (done)
+ return;
+ done++;
+
+ printk("dumping request; rq_addr = %s, rq_deferred = %p, rq_arg:\n",
+ svc_print_addr(rqstp, buf, sizeof(buf)), rqstp->rq_deferred);
+ dump_xdr_buf(&rqstp->rq_arg);
+
+ printk("head data (from %p):\n", orig_start);
+ dump_hex(orig_start, (argv->iov_base + argv->iov_len)
+ - (void *)orig_start);
+}
+
/*
* Process the RPC request.
*/
@@ -794,6 +814,7 @@ svc_process(struct svc_rqst *rqstp)
__be32 auth_stat, rpc_stat;
int auth_res;
__be32 *reply_statp;
+ __be32 *start;

rpc_stat = rpc_success;

@@ -819,6 +840,7 @@ svc_process(struct svc_rqst *rqstp)
if (rqstp->rq_prot == IPPROTO_TCP)
svc_putnl(resv, 0);

+ start = argv->iov_base;
rqstp->rq_xid = svc_getu32(argv);
svc_putu32(resv, rqstp->rq_xid);

@@ -971,6 +993,7 @@ err_short_len:
err_bad_dir:
if (net_ratelimit())
printk("svc: bad direction %d, dropping request\n", dir);
+ dump_once(rqstp, start);

serv->sv_stats->rpcbadfmt++;
goto dropit; /* drop request */
-
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