On 04-Jan-2014 5:18 AM, "neha naik" <nehanaik27@gmail.com> wrote:
Hi All, I am getting a request with bvec->bv_len > 512. Now, the information to be read is scattered across the entire disk in 512 chunks. So that, information on disk can be : sector 8, sector 100, sector 9. Now if i get a request to read with the bvec->bv_len > 512 i need to pull in the information from multiple places on disk since the data is not sequentially located. I tried to look at the linux source code because i think raid must be doing it all the time. (eg : on disk 1 we may be storing sector 6 and on disk 2 we may be storing sector 7 and so on).
You are right. Perhaps you need to clone the bio and set them properly. I guess you ought to check dm driver's make_request function. It does clone bio. I don't know if you can split that request while handling it. Perhaps reinserting that request could work.
However, i have not really got any useful information from it. Also scouring through articles on google has not helped much. I am hoping somebody points me in the right direction.
Thanks in advance, Neha
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