If we were going to reserve something, it should be a high number, not
a low one. Having 0 reserved makes some sense, but reserving other
low numbers seems kind of odd when they aren't already reserved.
I did some experiments.
Currently assigning higher-level qgroup to lower-level qgroup is not
possible. Consequently, assigning anything to 0-level qgroup is not
possible.
On the other hand, assigning qgroups while skipping levels (e.g. qgroup
2/P to 10/Q) is possible. So setting default snapshot level high is
technically possible, but you'll not be able to assign these high-level
qgroups anywhere low later.
although I hadn't realized that the snapshot command _does not_ have
this argument, when it absolutely should.
It does here in 4.4, it's just not documented :) I too found it by accident.
Perhaps have an option
Options always suit everyone except developers who need to implement and
support them :)
Here I'd like to wrap up since I seriously doubt any real btrfs
developers are still reading our discussion :)
--
With Best Regards,
Marat Khalili
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