示例#1
0
/*
 * Transfer an interrupt request to userspace
 *
 * Unlike other requests this is assembled on demand, without a need
 * to allocate a separate fuse_req structure.
 *
 * Called with fc->lock held, releases it
 */
static int fuse_read_interrupt(struct fuse_conn *fc, struct fuse_req *req,
			       const struct iovec *iov, unsigned long nr_segs)
{
	struct fuse_copy_state cs;
	struct fuse_in_header ih;
	struct fuse_interrupt_in arg;
	unsigned reqsize = sizeof(ih) + sizeof(arg);
	int err;

	list_del_init(&req->intr_entry);
	req->intr_unique = fuse_get_unique(fc);
	memset(&ih, 0, sizeof(ih));
	memset(&arg, 0, sizeof(arg));
	ih.len = reqsize;
	ih.opcode = FUSE_INTERRUPT;
	ih.unique = req->intr_unique;
	arg.unique = req->in.h.unique;

	spin_unlock(&fc->lock);
	if (iov_length(iov, nr_segs) < reqsize)
		return -EINVAL;

	fuse_copy_init(&cs, fc, 1, NULL, iov, nr_segs);
	err = fuse_copy_one(&cs, &ih, sizeof(ih));
	if (!err)
		err = fuse_copy_one(&cs, &arg, sizeof(arg));
	fuse_copy_finish(&cs);

	return err ? err : reqsize;
}
示例#2
0
static void flush_bg_queue(struct fuse_conn *fc)
{
	while (fc->active_background < fc->max_background &&
	       !list_empty(&fc->bg_queue)) {
		struct fuse_req *req;

		req = list_entry(fc->bg_queue.next, struct fuse_req, list);
		list_del(&req->list);
		fc->active_background++;
		req->in.h.unique = fuse_get_unique(fc);
		queue_request(fc, req);
	}
}
示例#3
0
static void queue_request(struct fuse_conn *fc, struct fuse_req *req)
{
	req->in.h.unique = fuse_get_unique(fc);
	req->in.h.len = sizeof(struct fuse_in_header) +
		len_args(req->in.numargs, (struct fuse_arg *) req->in.args);
	list_add_tail(&req->list, &fc->pending);
	req->state = FUSE_REQ_PENDING;
	if (!req->waiting) {
		req->waiting = 1;
		atomic_inc(&fc->num_waiting);
	}
	wake_up(&fc->waitq);
	kill_fasync(&fc->fasync, SIGIO, POLL_IN);
}