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由 Misono Tomohiro 提交于
This is a preparation work to refactor btrfs_ioctl_snap_destroy() and to allow rmdir(2) to delete an empty subvolume. Signed-off-by: NTomohiro Misono <misono.tomohiro@jp.fujitsu.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> [ minor update of the function comment ] Signed-off-by: NDavid Sterba <dsterba@suse.com>
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