e2fsck -f /dev/

i have to answer first question no , then the others y
so i can't use e2fsck -f -y /dev/

how can i do this?

Boot from a system rescue CD:

Download - SystemRescueCd

then in console mode only - do not use X - you can run fsck.

That answered your question - however, what problem do you have?

Do you know about /dev/MAKEDEV and /dev/MAKEDEV.local? Save those off somewhere first if you can.

Also /dev is a directory maintained by the kernel, so a reboot (assuming the MAKEDEV scripts are still okay) may fix problems. And. If you hose the directory by playing with it you will have to re-install Linux or restore from backup.

still with fsck , first i have to say no , then i have to say yes, millions of time ,
once i reduce filesystem without unmounted it
that cause error on that logical volume