On Mon, Apr 16, 2012 at 09:07:07PM +0800, Fengguang Wu wrote:
[..]
> Vivek, I noticed these lines in cfq code
>
> sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor);
>
> Why not use bdi->dev->devt? The problem is that dev_name() will
> return "btrfs-X" for btrfs rather than "major:minor".
Isn't bdi->dev->devt 0? I see following code.
add_disk()
bdi_register_dev()
bdi_register()
device_create_vargs(MKDEV(0,0))
dev->devt = devt = MKDEV(0,0);
So for normal block devices, I think bdi->dev->devt will be zero, that's
why probably we don't use it.
Thanks
Vivek
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