Re: [PATCH v2] fuse: use newer inode info when writeback cache is enabled

[Fengnan Chang <changfengnan@vivo.com>]

Remove cache=always still have this problem, this problem is related 
about FUSE_CAP_WRITEBACK_CACHE.

On 2021/8/6 20:20, Miklos Szeredi wrote:
> On Thu, 24 Jun 2021 at 09:42, Fengnan Chang <changfengnan@vivo.com> wrote:
>>
>> Hi Miklos:
>>
>> Thank you for the information, I have been able to reproduce the problem.
>>
>> The new version of the patch as below. Previous fsx test is pass now.
>> Need do more test, Can you help to test new patch? or send me your test
>> case, I will test this.
>>
>> Here is my test case, and is the problem this patch is trying to solve.
>> Case A:
>> mkdir /tmp/test
>> passthrough_ll -ocache=always,writeback /mnt/test/
>> echo "11111" > /tmp/test/fsx
>> ls -l /mnt/test/tmp/test/
>> echo "2222" >> /tmp/test/fsx
>> ls -l /mnt/test/tmp/test/
>>
>> Case B:
>> mkdir /tmp/test
>> passthrough_ll -ocache=always,writeback /mnt/test/
>> passthrough_ll -ocache=always,writeback /mnt/test2/
>> echo "11111" > /tmp/test/fsx
>> ls -l /mnt/test/tmp/test/
>> ls -l /mnt/test2/tmp/test/
>> echo "222" >> /mnt/test/tmp/test/fsx
>> ls -l /mnt/test/tmp/test/
>> ls -l /mnt/test2/tmp/test/
> 
> Both these testcases have the "cache=always" option, which means:
> cached values (both data and metadata) are always valid; i.e. changes
> will be made only through this client and not through some other
> channel (like the backing filesystem or another instance).
> 
> Why is "cache=always" used?
> 
> Thanks,
> Miklos
>