예제 #1
0
struct fuse_req *fuse_get_req(struct fuse_conn *fc)
{
	struct fuse_req *req;
	sigset_t oldset;
	int intr;
	int err;

	atomic_inc(&fc->num_waiting);
	block_sigs(&oldset);
	intr = wait_event_interruptible(fc->blocked_waitq, !fc->blocked);
	restore_sigs(&oldset);
	err = -EINTR;
	if (intr)
		goto out;

	err = -ENOTCONN;
	if (!fc->connected)
		goto out;

	req = fuse_request_alloc();
	err = -ENOMEM;
	if (!req)
		goto out;

	fuse_req_init_context(req);
	req->waiting = 1;
	return req;

 out:
	atomic_dec(&fc->num_waiting);
	return ERR_PTR(err);
}
예제 #2
0
/*
 * Gets a requests for a file operation, always succeeds
 *
 * This is used for sending the FLUSH request, which must get to
 * userspace, due to POSIX locks which may need to be unlocked.
 *
 * If allocation fails due to OOM, use the reserved request in
 * fuse_file.
 *
 * This is very unlikely to deadlock accidentally, since the
 * filesystem should not have it's own file open.  If deadlock is
 * intentional, it can still be broken by "aborting" the filesystem.
 */
struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file)
{
	struct fuse_req *req;

	atomic_inc(&fc->num_waiting);
	wait_event(fc->blocked_waitq, !fc->blocked);
	req = fuse_request_alloc();
	if (!req)
		req = get_reserved_req(fc, file);

	fuse_req_init_context(req);
	req->waiting = 1;
	return req;
}
예제 #3
0
static struct fuse_req *__fuse_get_req(struct fuse_conn *fc, unsigned npages,
				       bool for_background)
{
	struct fuse_req *req;
	int err;
	atomic_inc(&fc->num_waiting);

	if (fuse_block_alloc(fc, for_background)) {
		sigset_t oldset;
		int intr;

		block_sigs(&oldset);
		intr = wait_event_interruptible_exclusive(fc->blocked_waitq,
				!fuse_block_alloc(fc, for_background));
		restore_sigs(&oldset);
		err = -EINTR;
		if (intr)
			goto out;
	}

	err = -ENOTCONN;
	if (!fc->connected)
		goto out;

	req = fuse_request_alloc(npages);
	err = -ENOMEM;
	if (!req) {
		if (for_background)
			wake_up(&fc->blocked_waitq);
		goto out;
	}

	fuse_req_init_context(req);
	req->waiting = 1;
	req->background = for_background;
	return req;

 out:
	atomic_dec(&fc->num_waiting);
	return ERR_PTR(err);
}