problem with vsftpd. filesystem full

[vladone]

# du -h

Filesystem     Size    Used   Avail Capacity  Mounted on
/dev/ad1s1a    248M    228M    200K   100%    /
devfs          1.0K    1.0K      0B   100%    /dev
/dev/ad1s1e    248M     12K    228M     0%    /tmp
/dev/ad1s1f     36G    1.4G     32G     4%    /usr
/dev/ad1s1d    248M     35M    193M    15%    /var
devfs          1.0K    1.0K      0B   100%    /var/named/dev

My ftp directory is in root, but i can see there is no more free space.
I want to resize partitons in same slice. How i can do this?