On 5/21/07, Al Viro <[email protected]> wrote:
On Mon, May 21, 2007 at 03:00:55PM -0700, [email protected] wrote:
> + if (register_blkdev(LOOP_MAJOR, "loop"))
> + return -EIO;
> + blk_register_region(MKDEV(LOOP_MAJOR, 0), range,
> + THIS_MODULE, loop_probe, NULL, NULL);
> +
> + for (i = 0; i < nr; i++) {
> + if (!loop_init_one(i))
> + goto err;
> + }
> +
> + printk(KERN_INFO "loop: module loaded\n");
> + return 0;
> +err:
> + loop_exit();
This isn't good. You *can't* fail once a single disk has been registered.
Anyone could've opened it by now.
IOW, you need to
* register region *after* you are past the point of no return
That option is a lot harder than I thought. This requires an array to
keep intermediate result of preallocated "lo" device, blk_queue, and
disk structure before calling add_disk() or register region. And this
array could be potentially 1 million entries. Maybe I will use
vmalloc for it, but seems rather sick.
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