Messages in this thread | | | From | Andries.Brouwer@cwi ... | Date | Mon, 21 Apr 2003 23:43:06 +0200 (MEST) | Subject | Re: [PATCH] new system call mknod64 |
| |
Nice to see this discussion.
Linus says
> The question is only _where_ (not whether) we do the mapping. Right now we > keep "dev_t" in the same format as we give back to user space, and thus we > always map into that format internally. But we don't have to: we can have > an internal format that is different from the one we show users.
and in fact the patches I have been giving out use kdev_t as internal format, where you can think of kdev_t as u64, or, if you prefer, as struct { u32 major, minor; }.
As I wrote a month or two ago, my favourite version is to have register_region work in the kdev_t space, rather than the dev_t space, since intervals in kdev_t space have a direct interpretation in terms of major, minor.
Andries
(Both versions do not differ very much; as far as I am concerned the choice is not very important, but the kdev_t version is slightly cleaner.)
(As Al already remarked, device numbers do not play much of a role internally. I removed i_dev. We still have i_rdev.)
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |