Merge tag 'for-linus-4.1-merge-window' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs

Pull 9pfs updates from Eric Van Hensbergen:
"Some accumulated cleanup patches for kerneldoc and unused variables as
well as some lock bug fixes and adding privateport option for RDMA"

* tag 'for-linus-4.1-merge-window' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
net/9p: add a privport option for RDMA transport.
fs/9p: Initialize status in v9fs_file_do_lock.
net/9p: Initialize opts->privport as it should be.
net/9p: use memcpy() instead of snprintf() in p9_mount_tag_show()
9p: use unsigned integers for nwqid/count
9p: do not crash on unknown lock status code
9p: fix error handling in v9fs_file_do_lock
9p: remove unused variable in p9_fd_create()
9p: kerneldoc warning fixes

fs/9p/v9fs.h

···
  * @cache: cache mode of type &p9_cache_modes
  * @cachetag: the tag of the cache associated with this session
  * @fscache: session cookie associated with FS-Cache
- * @options: copy of options string given by user
  * @uname: string user name to mount hierarchy as
  * @aname: mount specifier for remote hierarchy
  * @maxdata: maximum data to be sent/recvd per protocol message

fs/9p/vfs_addr.c

···
 /**
  * v9fs_direct_IO - 9P address space operation for direct I/O
  * @iocb: target I/O control block
- * @iov: array of vectors that define I/O buffer
  * @pos: offset in file to begin the operation
- * @nr_segs: size of iovec array
  *
  * The presence of v9fs_direct_IO() in the address space ops vector
  * allowes open() O_DIRECT flags which would have failed otherwise.

fs/9p/vfs_file.c

···
 {
 	struct p9_flock flock;
 	struct p9_fid *fid;
-	uint8_t status;
+	uint8_t status = P9_LOCK_ERROR;
 	int res = 0;
 	unsigned char fl_type;
 
···
 	for (;;) {
 		res = p9_client_lock_dotl(fid, &flock, &status);
 		if (res < 0)
-			break;
+			goto out_unlock;
 
 		if (status != P9_LOCK_BLOCKED)
 			break;
···
 	case P9_LOCK_BLOCKED:
 		res = -EAGAIN;
 		break;
+	default:
+		WARN_ONCE(1, "unknown lock status code: %d\n", status);
+		/* fallthough */
 	case P9_LOCK_ERROR:
 	case P9_LOCK_GRACE:
 		res = -ENOLCK;
 		break;
-	default:
-		BUG();
 	}
 
+out_unlock:
 	/*
 	 * incase server returned error for lock request, revert
 	 * it locally

net/9p/protocol.c

···
 			}
 			break;
 		case 'R':{
-				int16_t *nwqid = va_arg(ap, int16_t *);
+				uint16_t *nwqid = va_arg(ap, uint16_t *);
 				struct p9_qid **wqids =
 				    va_arg(ap, struct p9_qid **);
 
···
 						 stbuf->n_gid, stbuf->n_muid);
 			} break;
 		case 'V':{
-				int32_t count = va_arg(ap, int32_t);
+				uint32_t count = va_arg(ap, uint32_t);
 				struct iov_iter *from =
 						va_arg(ap, struct iov_iter *);
 				errcode = p9pdu_writef(pdu, proto_version, "d",
···
 			}
 			break;
 		case 'R':{
-				int16_t nwqid = va_arg(ap, int);
+				uint16_t nwqid = va_arg(ap, int);
 				struct p9_qid *wqids =
 				    va_arg(ap, struct p9_qid *);
 

net/9p/trans_fd.c

···
 	opts->port = P9_PORT;
 	opts->rfd = ~0;
 	opts->wfd = ~0;
+	opts->privport = 0;
 
 	if (!params)
 		return 0;
···
 {
 	int err;
 	struct p9_fd_opts opts;
-	struct p9_trans_fd *p;
 
 	parse_opts(args, &opts);
 
···
 	if (err < 0)
 		return err;
 
-	p = (struct p9_trans_fd *) client->trans;
 	p9_conn_create(client);
 
 	return 0;

net/9p/trans_rdma.c

···
 	int sq_depth;
 	int rq_depth;
 	long timeout;
+	int privport;
 };
 
 /*
···
  */
 enum {
 	/* Options that take integer arguments */
-	Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout, Opt_err,
+	Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout,
+	/* Options that take no argument */
+	Opt_privport,
+	Opt_err,
 };
 
 static match_table_t tokens = {
···
 	{Opt_sq_depth, "sq=%u"},
 	{Opt_rq_depth, "rq=%u"},
 	{Opt_timeout, "timeout=%u"},
+	{Opt_privport, "privport"},
 	{Opt_err, NULL},
 };
 
···
 	opts->sq_depth = P9_RDMA_SQ_DEPTH;
 	opts->rq_depth = P9_RDMA_RQ_DEPTH;
 	opts->timeout = P9_RDMA_TIMEOUT;
+	opts->privport = 0;
 
 	if (!params)
 		return 0;
···
 		if (!*p)
 			continue;
 		token = match_token(p, tokens, args);
-		if (token == Opt_err)
-			continue;
-		r = match_int(&args[0], &option);
-		if (r < 0) {
-			p9_debug(P9_DEBUG_ERROR,
-				 "integer field, but no integer?\n");
-			continue;
+		if ((token != Opt_err) && (token != Opt_privport)) {
+			r = match_int(&args[0], &option);
+			if (r < 0) {
+				p9_debug(P9_DEBUG_ERROR,
+					 "integer field, but no integer?\n");
+				continue;
+			}
 		}
 		switch (token) {
 		case Opt_port:
···
 			break;
 		case Opt_timeout:
 			opts->timeout = option;
+			break;
+		case Opt_privport:
+			opts->privport = 1;
 			break;
 		default:
 			continue;
···
 	return 0;
 }
 
+static int p9_rdma_bind_privport(struct p9_trans_rdma *rdma)
+{
+	struct sockaddr_in cl = {
+		.sin_family = AF_INET,
+		.sin_addr.s_addr = htonl(INADDR_ANY),
+	};
+	int port, err = -EINVAL;
+
+	for (port = P9_DEF_MAX_RESVPORT; port >= P9_DEF_MIN_RESVPORT; port--) {
+		cl.sin_port = htons((ushort)port);
+		err = rdma_bind_addr(rdma->cm_id, (struct sockaddr *)&cl);
+		if (err != -EADDRINUSE)
+			break;
+	}
+	return err;
+}
+
 /**
  * trans_create_rdma - Transport method for creating atransport instance
  * @client: client instance
···
 
 	/* Associate the client with the transport */
 	client->trans = rdma;
+
+	/* Bind to a privileged port if we need to */
+	if (opts.privport) {
+		err = p9_rdma_bind_privport(rdma);
+		if (err < 0) {
+			pr_err("%s (%d): problem binding to privport: %d\n",
+			       __func__, task_pid_nr(current), -err);
+			goto error;
+		}
+	}
 
 	/* Resolve the server's address */
 	rdma->addr.sin_family = AF_INET;

net/9p/trans_virtio.c

···
 	vdev = dev_to_virtio(dev);
 	chan = vdev->priv;
 
-	return snprintf(buf, chan->tag_len + 1, "%s", chan->tag);
+	memcpy(buf, chan->tag, chan->tag_len);
+	buf[chan->tag_len] = 0;
+
+	return chan->tag_len + 1;
 }
 
 static DEVICE_ATTR(mount_tag, 0444, p9_mount_tag_show, NULL);