Is there a way to derive the subvolume ID from the stat(2)
st_dev, by the way.

# btrfs sub list .
ID 256 top level 5 path a
ID 257 top level 5 path b
# zstat +dev . a b
. 27
a 28
b 29

Are the dev numbers allocated in the same order as the
subvolids? Would there be any /sys, /proc, ioctl interface to
get this kind of information?

-- 
Stephane
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