static ssize_t do_read(struct file *file, char __user *buf,
size_t len, loff_t *ppos, int force_block)
{
unsigned int saved_flags;
ssize_t ret, count;
if (!force_block)
return __do_read(file, buf, len, ppos);
saved_flags = file->f_flags;
file->f_flags &= ~O_NONBLOCK;
ret = 0;
while (len > 0) {
count = __do_read(file, buf, len, ppos);
if (count == 0)
break;
if (count < 0) {
ret = count;
break;
}
len -= count;
buf += count;
ret += count;
}
file->f_flags = saved_flags;
return ret;
}
static int do_read(void *data, int size)
{
int r;
r = __do_read(input_fd, data, size);
if (r <= 0) {
pr_debug("reading input file (size expected=%d received=%d)",
size, r);
return -1;
}
trace_data_size += r;
return r;
}
static void __process_read_request(struct stream *s)
{
int np = 0;
struct stream_request *req;
while (!event_list_empty(&s->read_queue[IO_WAIT])) {
int ret;
req = event_list_first_entry(&s->read_queue[IO_WAIT], struct stream_request, node);
if (req->request == REQ_READ)
ret = __do_read(s, req);
else
ret = __do_accept(s, req);
if (ret && ret != -EAGAIN && ret != -EINTR)
goto out;
if (!ret) {
__move_to_queue(req, &s->read_queue[IO_FIN]);
} else
break;
np++;
}
return;
out:
__move_to_queue(req, &s->read_queue[IO_FIN]);
}