linux disk cannot mount to after file system goes read-only

[zuzu97]

i have centos 5.x server operating system.
my sata disk is full and file system (ext3) goes read-only.
i run FSCK than after filesystem is corrupted
i dont see anything (files or folder) ls command
"cd /var/lib/mysql" command worked but i dont see folder, file names

reboot machine so server cannot mount disk

what can i do

Thanks to any help