Example #1
0
static struct p9_fid *p9_fid_create(struct p9_client *clnt)
{
	int err;
	struct p9_fid *fid;

	P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
	fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
	if (!fid)
		return ERR_PTR(-ENOMEM);

	fid->fid = p9_idpool_get(clnt->fidpool);
	if (fid->fid < 0) {
		err = -ENOSPC;
		goto error;
	}

	memset(&fid->qid, 0, sizeof(struct p9_qid));
	fid->mode = -1;
	fid->rdir_fpos = 0;
	fid->uid = current->fsuid;
	fid->clnt = clnt;
	fid->aux = NULL;

	spin_lock(&clnt->lock);
	list_add(&fid->flist, &clnt->fidlist);
	spin_unlock(&clnt->lock);

	return fid;

error:
	kfree(fid);
	return ERR_PTR(err);
}
Example #2
0
static struct p9_fid *p9_fid_create(struct p9_client *clnt)
{
	int ret;
	struct p9_fid *fid;
	unsigned long flags;

	P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
	fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
	if (!fid)
		return ERR_PTR(-ENOMEM);

	ret = p9_idpool_get(clnt->fidpool);
	if (ret < 0) {
		ret = -ENOSPC;
		goto error;
	}
	fid->fid = ret;

	memset(&fid->qid, 0, sizeof(struct p9_qid));
	fid->mode = -1;
	fid->rdir_fpos = 0;
	fid->uid = current_fsuid();
	fid->clnt = clnt;
	fid->aux = NULL;

	spin_lock_irqsave(&clnt->lock, flags);
	list_add(&fid->flist, &clnt->fidlist);
	spin_unlock_irqrestore(&clnt->lock, flags);

	return fid;

error:
	kfree(fid);
	return ERR_PTR(ret);
}
Example #3
0
static int p9_tag_init(struct p9_client *c)
{
	int err = 0;

	c->tagpool = p9_idpool_create();
	if (IS_ERR(c->tagpool)) {
		err = PTR_ERR(c->tagpool);
		c->tagpool = NULL;
		goto error;
	}

	p9_idpool_get(c->tagpool); /* reserve tag 0 */

	c->max_tag = 0;
error:
	return err;
}
Example #4
0
static struct p9_req_t *
p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
{
	va_list ap;
	int tag, err;
	struct p9_req_t *req;
	unsigned long flags;
	int sigpending;
	int flushed = 0;

	P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);

	if (c->status != Connected)
		return ERR_PTR(-EIO);

	if (signal_pending(current)) {
		sigpending = 1;
		clear_thread_flag(TIF_SIGPENDING);
	} else
		sigpending = 0;

	tag = P9_NOTAG;
	if (type != P9_TVERSION) {
		tag = p9_idpool_get(c->tagpool);
		if (tag < 0)
			return ERR_PTR(-ENOMEM);
	}

	req = p9_tag_alloc(c, tag);
	if (IS_ERR(req))
		return req;

	/* marshall the data */
	p9pdu_prepare(req->tc, tag, type);
	va_start(ap, fmt);
	err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
	va_end(ap);
	p9pdu_finalize(req->tc);

	err = c->trans_mod->request(c, req);
	if (err < 0) {
		c->status = Disconnected;
		goto reterr;
	}

	/* if it was a flush we just transmitted, return our tag */
	if (type == P9_TFLUSH)
		return req;
again:
	P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
	err = wait_event_interruptible(*req->wq,
						req->status >= REQ_STATUS_RCVD);
	P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d (flushed=%d)\n",
						req->wq, tag, err, flushed);

	if (req->status == REQ_STATUS_ERROR) {
		P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
		err = req->t_err;
	} else if (err == -ERESTARTSYS && flushed) {
		P9_DPRINTK(P9_DEBUG_MUX, "flushed - going again\n");
		goto again;
	} else if (req->status == REQ_STATUS_FLSHD) {
		P9_DPRINTK(P9_DEBUG_MUX, "flushed - erestartsys\n");
		err = -ERESTARTSYS;
	}

	if ((err == -ERESTARTSYS) && (c->status == Connected) && (!flushed)) {
		P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
		spin_lock_irqsave(&c->lock, flags);
		if (req->status == REQ_STATUS_SENT)
			req->status = REQ_STATUS_FLSH;
		spin_unlock_irqrestore(&c->lock, flags);
		sigpending = 1;
		flushed = 1;
		clear_thread_flag(TIF_SIGPENDING);

		if (c->trans_mod->cancel(c, req)) {
			err = p9_client_flush(c, req);
			if (err == 0)
				goto again;
		}
	}

	if (sigpending) {
		spin_lock_irqsave(&current->sighand->siglock, flags);
		recalc_sigpending();
		spin_unlock_irqrestore(&current->sighand->siglock, flags);
	}

	if (err < 0)
		goto reterr;

	err = p9_check_errors(c, req);
	if (!err) {
		P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
		return req;
	}

reterr:
	P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
									err);
	p9_free_req(c, req);
	return ERR_PTR(err);
}