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由 Tomohiro Misono 提交于
Add new unprivileged ioctl BTRFS_IOC_GET_SUBVOL_INFO which returns the information of subvolume containing this inode. (i.e. returns the information in ROOT_ITEM and ROOT_BACKREF.) Reviewed-by: NGu Jinxiang <gujx@cn.fujitsu.com> Tested-by: NGu Jinxiang <gujx@cn.fujitsu.com> Signed-off-by: NTomohiro Misono <misono.tomohiro@jp.fujitsu.com> [ minor style fixes, update struct comments ] Signed-off-by: NDavid Sterba <dsterba@suse.com>
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