Messages in this thread |  | | Date | Mon, 2 Sep 2002 20:55:47 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: PATCH - change to blkdev->queue calling triggers BUG in md.c |
| |
On Tue, 3 Sep 2002 Andries.Brouwer@cwi.nl wrote: > > Why? > Because in some cases it is undesirable.
Again, Why?
You can always use the flat device as-is.
> Because in some cases it crashes the kernel.
But moving it to user space would cause the kernel to crash anyway. Bugs are bugs.
> Because it involves guessing and heuristics.
The same guesses and heuristics would have to be in user space.
> Because policy belongs in user space.
It's not policy. It's a fact of life that disks need to be split up into parts, and the partitioning schemes are well-defined and shared across multiple operating systems.
> Yes - that is my main point: doing it on demand. On demand only.
But I actually _agree_ with this.
However, that has nothing to do with whether it is in user space or kernel space. In many ways it is _easier_ to do on demand in kernel space: when somebody opens /dev/sda1 and it isn't partitioned yet, you know it needs to be.
The fact that partitioning right now is to some degree handled by device drivers is a problem, but that's not a user space vs kernel space issue. It's slowly getting moved to higher levels.
Linus
- 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/
|  |