hooanon05@xxxxxxxxxxx writes:
> Goswin von Brederlow:
>> As I said, keep the FDs open. In case of the split meta/files dirs you
>> would have orig_fd, meta_fd and delta_fd. And make read/write operate
>
> So your approach is that the files under meta/ and delta/ will be
> created and opened in open(2) to deltafs...
> While I am afraid it is not effective, I think I could understand your
> approach.
>
>
> J. R. Okajima
At a minimum I would open the file on the read-only branch unless the
file is already changed. You can create the meta/ and files/ FDs as
needed in any callback that modifies them. If the file is deleted at
that point you can create a dummy file and delete it while keeping the
FD. Just always creating the meta/ and files/ entries when a file is
opened for write seems simpler though and you need them anyway when
the first write call comes. If you track atime then you even need the
meta/ all the time.
But that is really justan implementation detail. It is how i would do it.
MfG
Goswin
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