Conceptual questions about device driver

[neha naik]

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?

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?


Regards,
Neha
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