On Sun, Aug 01, 2021 at 11:52:16PM +0300, Matwey V. Kornilov wrote: > BTRFS volume consists of a number of subvolumes which can be mounted > separately > from each other. The top-level subvolume always exists even if no subvolumes > were created manually. A subvolume can be denoted as the default subvolume > i.e. > the subvolume which is mounted by default. > > The default "default subvolume" is the top-level one, but this is far from the > common practices used in the wild. For instance, openSUSE provides an OS > snapshot/rollback feature based on BTRFS. To achieve this, the actual OS root > filesystem is located into a separate subvolume which is "default" but not > "top-level". That means that the /boot/dtb/ directory is also located inside > this default subvolume instead of top-level one. > > However, the existing btrfs u-boot driver always uses the top-level subvolume > as the filesystem root. This behaviour 1) is inconsistent with > > mount /dev/sda1 /target > > command, which mount the default subvolume 2) leads to the issues when > /boot/dtb cannot be found properly (see the reference). > > This patch uses the default subvolume as the filesystem root to overcome > mentioned issues. > > Reference: https://bugzilla.suse.com/show_bug.cgi?id=1185656 > Signed-off-by: Matwey V. Kornilov <matwey.korni...@gmail.com> > Reviewed-by: Qu Wenruo <w...@suse.com>
Applied to u-boot/master, thanks! -- Tom
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