• Josef Bacik's avatar
    Btrfs: make df be a little bit more understandable · bd4d1088
    Josef Bacik authored
    The way we report df usage is way confusing for everybody, including some other
    utilities (bacula for one).  So this patch makes df a little bit more
    understandable.  First we make used actually count the total amount of used
    space in all space info's.  This will give us a real view of how much disk space
    is in use.  Second, for blocks available, only count data space.  This makes
    things like bacula work because it says 0 when you can no longer write anymore
    data to the disk.  I think this is a nice compromise, since you will end up with
    something like the following
    [root@alpha ~]# df -h
    Filesystem            Size  Used Avail Use% Mounted on
                          148G   30G  111G  21% /
    /dev/sda1             194M  116M   68M  64% /boot
    tmpfs                 985M   12K  985M   1% /dev/shm
                          145G  140G     0 100% /mnt/btrfs-test
    Compare this with btrfsctl -i output
    [root@alpha btrfs-progs-unstable]# ./btrfsctl -i /mnt/btrfs-test/
    Metadata, DUP: total=4.62GB, used=2.46GB
    System, DUP: total=8.00MB, used=24.00KB
    Data: total=134.80GB, used=134.80GB
    Metadata: total=8.00MB, used=0.00
    System: total=4.00MB, used=0.00
    operation complete
    This way we show that there is no more data space to be used, but we have
    another 5GB of space left for metadata.  Thanks,
    Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
    Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>