How to calculate total file system space

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How to calculate total file system space ,

Need to get total local file system space // I am using below command

df -hTP -l -x tmpfs -x devtmpfs --total, but for BTRFS file system we have multiple duplicate LVs that giving wrong output . Is their any way to exclude duplicate lv for df

Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/system-root btrfs 126G 25G 100G 20% /
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/tmp
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/lib/mailman
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/spool
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/crash
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/lib/pgsql
/dev/mapper/system-root btrfs 126G 25G 100G 20% /.snapshots
/dev/mapper/system-root btrfs 126G 25G 100G 20% /opt
/dev/mapper/sapshared-shared xfs 256G 114G 143G 45% /sapmnt/shared
/dev/mapper/system-root btrfs 126G 25G 100G 20% /home
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/lib/named
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/lib/mariadb
/dev/mapper/saplog-log xfs 256G 4.2G 252G 2% /sapmnt/log
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/opt
/dev/mapper/system-root btrfs 126G 25G 100G 20% /tmp
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/lib/libvirt/images
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/log
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/cache
/dev/mapper/sapdata-data xfs 1.0T 122G 903G 12% /sapmnt/data
/dev/mapper/system-root btrfs 126G 25G 100G 20% /srv
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/lib/machines
/dev/mapper/system-root btrfs 126G 25G 100G 20% /usr/local
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/opt/BESClient
/dev/mapper/system-root btrfs 126G 25G 100G 20% /var/lib/mysql
total - 4.1T 764G 3.4T 19% -

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