Re: [PATCH v3] btrfs: fiemap: Cache and merge fiemap extent before submit it to user

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

On 2017年06月17日 16:30, Adam Borowski wrote:
> On Sat, Jun 17, 2017 at 03:43:18PM +0800, Qu Wenruo wrote:
>> On 2017年06月16日 20:33, David Sterba wrote:
>>> I see a lot of warnings from btrfs/094
>>>
>>> [13458.628334] BTRFS warning (device sdb6): unhandled fiemap cache detected: offset=581632 phys=13078528 len=4096 flags=0x800
>>
>> Strangely, I can't reproduce it either on my original branch (v4.12 with
>> this patch), or torvalds/master (this patch is already merged with your
>> renaming)
> 
> I for one get this a lot even in regular use.  Somehow, it always has Comm:
> dpkg, despite the vast majority of activity on the system obviously not
> being dpkg.

Is that with 0x800 flag? Or some other flag?
I'm trying fallocated file with my original branch, but still no chance 
to reproduce it though.

> 
>> However I tried all btrfs/09*,  nothing happened.
>>
>> Is some other out-of-tree patch causing the problem?
>> If so, which branch are you testing? I think I could help to fix it.
> 
> For me, linus/master with a handful of not possibly relevant patches
> (in fs/btrfs/ I have dedupe and defrag on files opened ro, raid5/6 warning,
> raid5/6 incompat flag clearing).

linus/master without any extra patch is still the same?
And which commit?
I'm using 1439ccf73d9c07654fdd5b4969fd53c2feb8684d, at least it doesn't 
cause any warning the related test case, and I tried several combination 
with preallocated and written and hole, still no chance.

I also ran btrfs/* with my patch applied on v4.11-rc2 (sorry, that's the 
correct original patch base), and except some known bug, it doesn't 
cause anything special.

Thanks,
Qu

> 
> 
> Meow!
>