On Wed, May 6, 2015 at 12:26 AM, Christoph Hellwig <hch@xxxxxx> wrote:
>> -static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
>> +static int __chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio)
>
> Call it raid5_read_one_chunk or something similar descriptive?
>
>> {
>> struct r5conf *conf = mddev->private;
>> int dd_idx;
>> @@ -4718,7 +4718,7 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
>> sector_t end_sector;
>>
>> if (!in_chunk_boundary(mddev, raid_bio)) {
>> - pr_debug("chunk_aligned_read : non aligned\n");
>> + pr_debug("__chunk_aligned_read : non aligned\n");
>
> Switch to __func__?
>
>> +static struct bio *chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio)
>> +{
>> + struct bio *split;
>> +
>> + do {
>> + sector_t sector = raid_bio->bi_iter.bi_sector;
>> + unsigned chunk_sects = mddev->chunk_sectors;
>> +
>> + unsigned sectors = chunk_sects -
>> + (likely(is_power_of_2(chunk_sects))
>> + ? (sector & (chunk_sects-1))
>> + : sector_div(sector, chunk_sects));
>
> This would be a lot more readable with a good old if.
>
>> if (rw == READ && mddev->degraded == 0 &&
>> mddev->reshape_position == MaxSector &&
>> - chunk_aligned_read(mddev,bi))
>> + (!(bi = chunk_aligned_read(mddev, bi))))
>> return;
>
> if (rw == READ && mddev->degraded == 0 &&
> mddev->reshape_position == MaxSector) {
> bi = chunk_aligned_read(mddev, bi);
> if (!bi)
> return;
> }
Will update all. Thanks.
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