I understand what you mean now.
Valid layerout is not always the 'right' layerout.
Thanks for you help.
Regards.
YangLiu
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Thanks,Neil.
I noticed that the whole codes of calculating the underlying device is below
{
sector_t x = (block - zone->zone_offset) >> chunksize_bits;
sector_div(x, zone->nb_dev);
chunk = x;
BUG_ON(x != (sector_t)chunk);
When I read the code of raid0_make_request,I meet some questions.
1\ block = bio->bi_sector >> 1,it's the device offset in kilotytes.
so why do we use block substract zone->zone_offset? The
zone->zone_offset is the zone offset relative the mddev in sectors.
2\ the codes below:
x = block >> chu
Neil,thanks for you help.Your explanation is helpful really.
I went through the code of raid0_make_request again this evening, and
I still had some questions.
1\ block = bio->bi_sector >> 1,it's the device offset in kilotytes.
so why do we use block substract zone->zone_offset? The
zone->zone_off
2006/6/13, Neil Brown <[EMAIL PROTECTED]>:
On Tuesday June 13, [EMAIL PROTECTED] wrote:
> hello,everyone.
> I am studying the code of raid0.But I find that the logic of
> raid0_make_request is a little difficult to understand.
> Who can tell me what the function of raid0_make_request will do even
hello,everyone.
I am studying the code of raid0.But I find that the logic of
raid0_make_request is a little difficult to understand.
Who can tell me what the function of raid0_make_request will do eventually?
Regards.
Thanks!
YangL
