On 2022-04-21 03:17, Paul Menzel wrote:
> Dear Logan,
>
>
> Thank you for these patches.
>
>
> Am 20.04.22 um 21:54 schrieb Logan Gunthorpe:
>> There are a few uses of an ugly ternary operator in raid5_make_request()
>> to check if a sector is a head of a reshape sector.
>>
>> Factor this out into a simple helper called ahead_of_reshape().
>>
>> This appears to fix the first bio_wouldblock_error() check which appears
>> to have comparison operators that didn't match the check below which
>> causes a schedule. Besides this, no functional changes intended.
>
> If there is an error, could that be fixed in a separate commit, which
> could be applied to the stable series?
Yes, sure. Though, I'm not 100% sure there's an error or noticeable bug.
It's just that the logic didn't match and it made cleaning up the code
overly complicated.
>
>> Suggested-by: Christoph Hellwig <hch@xxxxxx>
>> Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
>> ---
>> drivers/md/raid5.c | 29 +++++++++++++++++------------
>> 1 file changed, 17 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
>> index 7f7d1546b9ba..97b23c18402b 100644
>> --- a/drivers/md/raid5.c
>> +++ b/drivers/md/raid5.c
>> @@ -5787,6 +5787,15 @@ static void make_discard_request(struct mddev
>> *mddev, struct bio *bi)
>> bio_endio(bi);
>> }
>> +static bool ahead_of_reshape(struct mddev *mddev, sector_t sector,
>> + sector_t reshape_sector)
>> +{
>> + if (mddev->reshape_backwards)
>> + return sector < reshape_sector;
>> + else
>> + return sector >= reshape_sector;
>
> I like the ternary operator. ;-)
>
> return mddev->reshape_backwards ? (return sector < reshape_sector) :
> (sector >= reshape_sector)
>
> Sorry, does not matter.
Yeah, I think plenty of people do not, though; it's harder to read with
the long line and awkward to wrap.
> Reviewed-by: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
Thanks,
Logan
