static int scullv_defer_op(int write, struct kiocb *iocb, char __user *buf,
size_t count, loff_t pos)
{
struct async_work *stuff;
int result;
/* Copy now while we can access the buffer */
if (write)
result = scullv_write(iocb->ki_filp, buf, count, &pos);
else
result = scullv_read(iocb->ki_filp, buf, count, &pos);
/* If this is a synchronous IOCB, we return our status now. */
if (is_sync_kiocb(iocb))
return result;
/* Otherwise defer the completion for a few milliseconds. */
stuff = kmalloc (sizeof (*stuff), GFP_KERNEL);
if (stuff == NULL)
return result; /* No memory, just complete now */
stuff->iocb = iocb;
stuff->result = result;
INIT_DELAYED_WORK(&stuff->work, scullv_do_deferred_op);
schedule_delayed_work(&stuff->work, HZ/100);
return -EIOCBQUEUED;
}
int scullv_write_20 (struct inode *ino, struct file *f, const char *b, int c)
{
return (int)scullv_write(f, b, c, &f->f_pos);
}