Re: Why does stat() return invalid st_dev field for btrfs ??

[Mark Lord]

Kay Sievers wrote:
> On Mon, Aug 17, 2009 at 22:47, Mark Lord<lkml@xxxxxx> wrote:
> > Chris / list,
> >
> > stat(2) seems to return invalid major/minor device info
> > for btrfs filesystems.
> >
> > Why?  Is this a bug?
>
> This is not invalid and not a bug. It's a superblock without a device,
> and expected behavior.
>
> There is no one-to-one relation from a btrfs mountpoint to a device,
> it's a tree, and therefore therefore there can not be a single
> major/minor.
..

Sure there is for the most common case.
When there is only a single device, stat() should return that device.
When there are several, it should do something different.

But really, it should be using DM/LVM when there are multiple devices.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/