unable to resize snap lv

Hello,

Please assist me how do I resize the lv snapshot it's giving error as below:

[root@cindb1003a ~]# umount /lvsnap
[root@cindb1003a ~]# lvextend -L +20G /dev/VGExaDb/volsnap
Snapshot origin volumes can be resized only while inactive: try lvchange -an
[root@cindb1003a ~]# lvchange -an -f /dev/VGExaDb/volsnap
LV VGExaDb/volsnap has open snapshot snap_lv: not deactivating
LV VGExaDb/volsnap has open snapshot snapclone2: not deactivating
[root@cindb1003a ~]# umount /lvclone
[root@cindb1003a ~]# umount /lvclone2
umount: /lvclone2: device is busy
umount: /lvclone2: device is busy

Best regards,

Vishal