Mike Christie wrote: > Jens Axboe wrote: >> On Thu, Dec 21 2006, Mike Christie wrote: >>> Or the block layer code could set up the clone too. elv_next_request >>> could prep a clone based on the orignal request for the driver then dm >>> would not have to worry about that part. >> It really can't, since it doesn't know how to allocate the clone >> request. I'd rather export this functionality as helpers. >> > > What do you think about dm's plan to break up make_request into a > mapping function and in to the part the builds the bio into a request. > This would fit well with them being helpers and being able to allocate > the request from the correct context. > > I see patches for that did not get posted, but I thought Joe and > Alasdair used to talk about that a lot and in the dm code I think there > is sill comments about doing it. Maybe the dm comments mentioned the > merge_fn, but I guess the merge_fn did not fit what they wanted to do or > something. I think Alasdair talked about this at one of his talks at OLS > or it was in a proposal for the kernel summit. I can dig up the mail if > you want. > Ignore that. The problem would be that we may not want to decide which path to use at map time. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
