ceph: hex dump corrupt server data to KERN_DEBUG

Also, print fsid using standard format, NOT hex dump.
Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/caps.c

@@ -2681,6 +2681,7 @@ done:
 
 bad:
 	pr_err("ceph_handle_caps: corrupt message\n");
+	ceph_msg_dump(msg);
 	return;
 }
 

fs/ceph/mds_client.c

@@ -1650,6 +1650,7 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
 		return;
 	if (msg->front.iov_len < sizeof(*head)) {
 		pr_err("mdsc_handle_reply got corrupt (short) reply\n");
+		ceph_msg_dump(msg);
 		return;
 	}
 
@@ -1740,6 +1741,7 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
 	mutex_lock(&session->s_mutex);
 	if (err < 0) {
 		pr_err("mdsc_handle_reply got corrupt reply mds%d\n", mds);
+		ceph_msg_dump(msg);
 		goto out_err;
 	}
 
@@ -1929,6 +1931,7 @@ static void handle_session(struct ceph_mds_session *session,
 bad:
 	pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
 	       (int)msg->front.iov_len);
+	ceph_msg_dump(msg);
 	return;
 }
 
@@ -2394,6 +2397,7 @@ out:
 
 bad:
 	pr_err("corrupt lease message\n");
+	ceph_msg_dump(msg);
 }
 
 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,

fs/ceph/mdsmap.c

@@ -49,6 +49,7 @@ int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m)
 struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 {
 	struct ceph_mdsmap *m;
+	const void *start = *p;
 	int i, j, n;
 	int err = -EINVAL;
 	u16 version;
@@ -154,6 +155,9 @@ badmem:
 	err = -ENOMEM;
 bad:
 	pr_err("corrupt mdsmap\n");
+	print_hex_dump(KERN_DEBUG, "mdsmap: ",
+		       DUMP_PREFIX_OFFSET, 16, 1,
+		       start, end - start, true);
 	ceph_mdsmap_destroy(m);
 	return ERR_PTR(-EINVAL);
 }

fs/ceph/messenger.c

@@ -2115,3 +2115,23 @@ void ceph_msg_last_put(struct kref *kref)
 	else
 		ceph_msg_kfree(m);
 }
+
+void ceph_msg_dump(struct ceph_msg *msg)
+{
+	pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
+		 msg->front_max, msg->nr_pages);
+	print_hex_dump(KERN_DEBUG, "header: ",
+		       DUMP_PREFIX_OFFSET, 16, 1,
+		       &msg->hdr, sizeof(msg->hdr), true);
+	print_hex_dump(KERN_DEBUG, " front: ",
+		       DUMP_PREFIX_OFFSET, 16, 1,
+		       msg->front.iov_base, msg->front.iov_len, true);
+	if (msg->middle)
+		print_hex_dump(KERN_DEBUG, "middle: ",
+			       DUMP_PREFIX_OFFSET, 16, 1,
+			       msg->middle->vec.iov_base,
+			       msg->middle->vec.iov_len, true);
+	print_hex_dump(KERN_DEBUG, "footer: ",
+		       DUMP_PREFIX_OFFSET, 16, 1,
+		       &msg->footer, sizeof(msg->footer), true);
+}

fs/ceph/messenger.h

@@ -254,4 +254,6 @@ static inline void ceph_msg_put(struct ceph_msg *msg)
 	kref_put(&msg->kref, ceph_msg_last_put);
 }
 
+extern void ceph_msg_dump(struct ceph_msg *msg);
+
 #endif

fs/ceph/mon_client.c

@@ -242,6 +242,7 @@ static void handle_subscribe_ack(struct ceph_mon_client *monc,
 	return;
 bad:
 	pr_err("got corrupt subscribe-ack msg\n");
+	ceph_msg_dump(msg);
 }
 
 /*
@@ -364,6 +365,7 @@ static void handle_statfs_reply(struct ceph_mon_client *monc,
 
 bad:
 	pr_err("corrupt statfs reply, no tid\n");
+	ceph_msg_dump(msg);
 }
 
 /*

fs/ceph/osd_client.c

@@ -773,6 +773,7 @@ bad:
 	pr_err("corrupt osd_op_reply got %d %d expected %d\n",
 	       (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
 	       (int)sizeof(*rhead));
+	ceph_msg_dump(msg);
 }
 
 
@@ -964,6 +965,7 @@ done:
 
 bad:
 	pr_err("osdc handle_map corrupt msg\n");
+	ceph_msg_dump(msg);
 	up_write(&osdc->map_sem);
 	return;
 }

fs/ceph/osdmap.c

@@ -726,6 +726,9 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 bad:
 	pr_err("corrupt inc osdmap epoch %d off %d (%p of %p-%p)\n",
 	       epoch, (int)(*p - start), *p, start, end);
+	print_hex_dump(KERN_DEBUG, "osdmap: ",
+		       DUMP_PREFIX_OFFSET, 16, 1,
+		       start, end - start, true);
 	if (newcrush)
 		crush_destroy(newcrush);
 	return ERR_PTR(err);

fs/ceph/snap.c

@@ -877,6 +877,7 @@ split_skip_inode:
 
 bad:
 	pr_err("corrupt snap message from mds%d\n", mds);
+	ceph_msg_dump(msg);
 out:
 	if (locked_rwsem)
 		up_write(&mdsc->snap_rwsem);

fs/ceph/super.c

@@ -602,13 +602,8 @@ int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
 {
 	if (client->have_fsid) {
 		if (ceph_fsid_compare(&client->fsid, fsid)) {
-			print_hex_dump(KERN_ERR, "this fsid: ",
-				       DUMP_PREFIX_NONE, 16, 1,
-				       (void *)fsid, 16, 0);
-			print_hex_dump(KERN_ERR, " old fsid: ",
-				       DUMP_PREFIX_NONE, 16, 1,
-				       (void *)&client->fsid, 16, 0);
-			pr_err("fsid mismatch\n");
+			pr_err("bad fsid, had " FSID_FORMAT " got " FSID_FORMAT,
+			       PR_FSID(&client->fsid), PR_FSID(fsid));
 			return -1;
 		}
 	} else {