In boot camp, it only see partition size to be 149G while disk utility shows only one partition with size 320G.

Why diskutil and df gives me different sizes? Also how can i fix it?

thanks

df -h
Filesystem      Size   Used  Avail Capacity  Mounted on
/dev/disk0s2   **149Gi   20Gi  129Gi    14%    /**
devfs          110Ki  110Ki    0Bi   100%    /dev
map -hosts       0Bi    0Bi    0Bi   100%    /net
map auto_home    0Bi    0Bi    0Bi   100%    /home

and

diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        ***320.1 GB   disk0**
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS Mac HD                  319.6 GB   disk0s2