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btrfs: qgroup: Switch to new extent-oriented qgroup mechanism.
Switch from old ref_node based qgroup to extent based qgroup mechanism for normal operations. The new mechanism should hugely reduce the overhead of btrfs quota system, and further more, the codes and logic should be more clean and easier to maintain. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
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Qu Wenruo
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Chris Mason
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Jun 10, 2015
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