On Fri, Aug 2, 2013 at 2:25 AM, neha naik <nehanaik27@xxxxxxxxx> wrote: > Hi, > I have some conceptual questions about device driver : > > 1. Write order fidelity should be maintained when submitting requests from > device driver to disk below. > However, acknowledging these requests it is okay if we don't necessarily > maintain that order, right? > Yes it should not matter as long as application can rely on data being written is in order of submission. > 2. Also i want to understand what the device driver does say if in a > multiple paged bio, some of the pages get written > and some don't, we send the error in the bio. But what about the pages > it has already written??? It can't possibly > do anything about it, right? > Applications generally do not make any assumption about data state for a failed IO, They might retry again, and blocks might get overwritten again with same data. So it is perfectly fine. > > Regards, > Neha > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > Rajat _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
