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>