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Commit b20fe56c authored by Qu Wenruo's avatar Qu Wenruo Committed by David Sterba
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btrfs: qgroup: allow quick inherit if snapshot is created and added to the same parent



Currently "btrfs subvolume snapshot -i <qgroupid>" would always mark the
qgroup inconsistent.

This can be annoying if the fs has a lot of snapshots, and needs qgroup
to get the accounting for the amount of bytes it can free for each
snapshot.

Although we have the new simple quote as a solution, there is also a
case where we can skip the full scan, if all the following conditions
are met:

- The source subvolume belongs to a higher level parent qgroup
- The parent qgroup already owns all its bytes exclusively
- The new snapshot is also added to the same parent qgroup

In that case, we only need to add nodesize to the parent qgroup and
avoid a full rescan.

This patch would add the extra quick accounting update for such inherit.

Signed-off-by: default avatarQu Wenruo <wqu@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 86211eea
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