Receiving an error when using resize2fs on /tmp
I receive the below error when using the resize2fs command on /tmp. The filesystem is ext3.
# resize2fs /dev/mappee/Tmp
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/mapper/Tmp is mounted on /tmp; on-line resizing required
Performing an on-line resize of /dev/mapper/VG00-Tmp to 1048576 (1k) blocks.
resize2fs: Operation not permitted While trying to add group #96
Do any know what this error is and how can I do the resize online.
I tried to umount /tmp but I keep getting busy and I don't fine any process ids when I do the fuser.