Hi Osamu, Sorry, I think I misunderstood what you meant by "Since we expect any sane person set-default to the root-filesystem". I thought you meant this: since we expect any sane person will run set-default [@] to / Which really surprised me, because I didn't think anyone had this position, and I struggled to find reasons to value that perspective (hence the research!). Thank you for your patience with that long reply; it would have been *much* shorter had I not misunderstood. Now I think you meant this: since we expect any sane person will set-default to subvol=/ One good thing that came out of this investigation is knowing that SUSE uses set-default=@. Obviously their grub supports this, because their /boot is the OS partition, and this is btrfs, and it successfully boots...but I'm not sure if ours does, and if os-prober will need extra work to support this, or if our grub would benefit from the hypothetical SUSE patch. Just now, to be thorough, I checked to see if anything in Debian might be recommending set-default, or actually executing it, so I did a codesearch: https://sources.debian.org/src/systemd/247.3-1/docs/DISCOVERABLE_PARTITIONS.md/?hl=176#L176 * Recommends using it https://sources.debian.org/src/btrbk/0.27.1-1.1/doc/FAQ.md/?hl=144#L144 * Lists it as an equal option to the subvol=@foo method Luckily we don't have anything unexpected in codesearch that executes set-default. Cheers, Nicholas
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