On Mon, Sep 09 2019, Song Liu wrote:
> Hi Neil,
>
>> On Sep 9, 2019, at 7:57 AM, NeilBrown <neilb@xxxxxxx> wrote:
>>
>>
>> If the drives in a RAID0 are not all the same size, the array is
>> divided into zones.
>> The first zone covers all drives, to the size of the smallest.
>> The second zone covers all drives larger than the smallest, up to
>> the size of the second smallest - etc.
>>
>> A change in Linux 3.14 unintentionally changed the layout for the
>> second and subsequent zones. All the correct data is still stored, but
>> each chunk may be assigned to a different device than in pre-3.14 kernels.
>> This can lead to data corruption.
>>
>> It is not possible to determine what layout to use - it depends which
>> kernel the data was written by.
>> So we add a module parameter to allow the old (0) or new (1) layout to be
>> specified, and refused to assemble an affected array if that parameter is
>> not set.
>>
>> Fixes: 20d0189b1012 ("block: Introduce new bio_split()")
>> cc: stable@xxxxxxxxxxxxxxx (3.14+)
>> Signed-off-by: NeilBrown <neilb@xxxxxxx>
>
> Thanks for the patches. They look great. However, I am having problem
> apply them (not sure whether it is a problem on my side). Could you
> please push it somewhere so I can use cherry-pick instead?
I rebased them on block/for-next, fixed the problems that Guoqing found,
and pushed them to
https://github.com/neilbrown/linux md/raid0
NeilBrown
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