> +/*
> + * Sleep until I_SYNC is cleared. This function must be called with i_lock
> + * held and drops it. It is aimed for callers not holding any inode reference
> + * so once i_lock is dropped, inode can go away.
> + */
> +static void inode_sleep_on_writeback(struct inode *inode)
> + __releases(inode->i_lock)
> +{
> + DEFINE_WAIT(wait);
> + wait_queue_head_t *wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
> + int sleep;
i_state is "unsigned long", it's better to use the same type.
> +
> + prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE);
> + sleep = inode->i_state & I_SYNC;
> + spin_unlock(&inode->i_lock);
> + if (sleep)
> + schedule();
> + finish_wait(wqh, &wait);
> +}
> +
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