what is superblock in filesystem?
 

what is superblock in fat filesystem?what does the export symbol command actually do?could someone tell me please?

Superblock in FAT is first 512 bytes of the partition. It's also called the boot sector. There number of bytes per sector, sectors per cluster, media type and so on.

What do you mean by 'export symbol command'?

oh thanx....i saw exportsymbol(not sure what...)inside a .c file in the fat dir...what is that?

If it was in a .c file, it's not a command. It was probably a function in the C code.

ok...but there was no definition for it...dunno where to find it...

Look into include/linux/module.h