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由 Qu Wenruo 提交于
This is used by later qgroup fix patches for snapshot. As current snapshot accounting is done by btrfs_qgroup_inherit(), but new extent oriented quota mechanism will account extent from btrfs_copy_root() and other snapshot things, causing wrong result. So add this ability to handle snapshot accounting. Signed-off-by: NQu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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