I checked this for all three devices and num_devices is 4 for all of them.
The full output is below.
so now if you mount and run 'btrfs fi show <mnt>' that should tell
device missing, which then 'btrfs device missing <mnt>' should be
successful theoretically.
It may fail if you are mounting more than one subvol during boot and if
you don't have this patch.
commit 0f23ae74f589304bf33233f85737f4fd368549eb
Author: Chris Mason <clm@xxxxxx>
Date: Thu Sep 18 07:49:05 2014 -0700
Revert "Btrfs: device_list_add() should not update list when mounted"
This reverts commit b96de000bc8bc9688b3a2abea4332bd57648a49f.
I am running 3.18-rc5+ from linus tree. If I am not mistaken,
that commit is his tree in since 3.17-rc6.
Ah yes. sorry i just missed that point.
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