Re: [RFC v3 0/2] vfs / btrfs: add support for ustat()

[Al Viro]

On Thu, Aug 14, 2014 at 07:58:56PM -0700, Luis R. Rodriguez wrote:

> Christoph had noted that this seemed associated to the problem
> that the btrfs uses different assignments for st_dev than s_dev,
> but much as I'd like to see that changed based on discussions so
> far its unclear if this is going to be possible unless strong
> commitment is reached.

Explain, please.  Whose commitment and commitment to what, exactly?
Having different ->st_dev values for different files on the same
fs is a bloody bad idea; why does btrfs do that at all?  If nothing else,
it breaks the usual "are those two files on the same fs?" tests...
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