On Sat, Feb 01, 2020 at 12:00:39PM +0800, qiwuchen55@xxxxxxxxx wrote:
> From: chenqiwu <chenqiwu@xxxxxxxxxx>
>
> Remove trivial nowait check for ext4_buffered_write_iter(),
> since buffered writes will return -EINVAL if IOCB_NOWAIT
> passed in the follow-up function ext4_write_checks()->
> ext4_generic_write_checks()->generic_write_checks().
>
> Signed-off-by: chenqiwu <chenqiwu@xxxxxxxxxx>
The reason why we do this check here is so that we return immediately
and not potentially block when we call inode_lock(). Otherwise, an
AIO request with IOCB_NOWAIT could block, and that's not allowed.
- Ted
