Re: [PATCH 1/3] fuse: invalidate page cache pages before direct write

[Alan Huang <mmpgouride@xxxxxxxxx>]

> 2023年8月1日 18:40，Hao Xu <hao.xu@xxxxxxxxx> 写道：
> 
> Hi Alan,
> 
> 
> On 8/1/23 18:14, Alan Huang wrote:
>>> 2023年8月1日 16:06，Hao Xu <hao.xu@xxxxxxxxx> 写道：
>>> 
>>> From: Hao Xu <howeyxu@xxxxxxxxxxx>
>>> 
>>> In FOPEN_DIRECT_IO, page cache may still be there for a file since
>>> private mmap is allowed. Direct write should respect that and invalidate
>>> the corresponding pages so that page cache readers don't get stale data.
>> Do other filesystems also invalidate page cache in this case?
> 
> 
> For now all filesystems that use iomap do this invalidation, see: __iomap_dio_rw()

Thanks!

> 
> e.g. ext4, xfs
> 
> 
> Regards,
> 
> Hao
>