Re: [blktests v1] block: add test for io_uring Protection Information (PI) interface using FS_IOC_GETLBMD_CAP

[Anuj Gupta/Anuj Gupta <anuj20.g@samsung.com>]

> The errors were as follows:
> 
> block/041 => nvme1n1 (io_uring read with PI metadata buffer on block device) [failed]
>      runtime    ...  0.354s
>      --- tests/block/041.out     2025-08-13 19:56:15.487074413 +0900
>      +++ /home/shin/Blktests/blktests/results/nvme1n1/block/041.out.bad  2025-08-13 20:06:23.199291948 +0900
>      @@ -1,2 +1,12 @@
>       Running block/041
>      +fio: io_u error on file /dev/nvme1n1: Invalid or incomplete multibyte or wide character: read offset=12288, buflen=4096
>      +fio: io_u error on file /dev/nvme1n1: Invalid or incomplete multibyte or wide character: read offset=688128, buflen=4096
>      +fio: io_u error on file /dev/nvme1n1: Invalid or incomplete multibyte or wide character: read offset=630784, buflen=4096
>      +fio: io_u error on file /dev/nvme1n1: Invalid or incomplete multibyte or wide character: read offset=905216, buflen=4096
>      +fio: io_u error on file /dev/nvme1n1: Invalid or incomplete multibyte or wide character: read offset=233472, buflen=4096
>      +fio: io_u error on file /dev/nvme1n1: Invalid or incomplete multibyte or wide character: read offset=540672, buflen=4096
>      ...
>      (Run 'diff -u tests/block/041.out /home/shin/Blktests/blktests/results/nvme1n1/block/041.out.bad' to see the entire diff)
> 
>>
>> The issue occurs because setting ms and pi in the QEMU command line is
>> not enough, the namespace still needs to be formatted. Could you please
>> run the test again after running the nvme format command on device with
>> the desired LBA format (PI enabled).
> 
> Ah, thanks. I ran "nvme format -i 1 /dev/nvme0n1" for the QEMU NVME device
> prepared with QEMU NVME option "ms=8,pi=1", then the test case passes. The
> test case looks working as expected :)

Hi Shinichiro,

Thanks a lot for your detailed review comments. Sorry for the delay in 
re-spinning - I had a few conflicting deadlines.
I have addressed your feedback and sent out a v2 here:
https://lore.kernel.org/linux-block/20250919101028.14245-1-anuj20.g@samsung.com/

Thanks,
Anuj Gupta