vfs

This is a fs simulator for studying vfs system.

create a disk image

qemu-img

fdisk

This tool is used to fdisk harddisk

losetup(floppy) v.s. kpartx

losetup for floppy kpartx for harddisk kpartx -av ./img // kpartx -d ./img

mkfs

mkfs -t ext2 /dev/loopxxx

mount

dumpe2fs -h

i-node

1. i-node idx start from 0,

block

1. block id start from 0, and block id is from beginning of the disk. not per group.
2. boot section locates in block 0, No. 0 sctor.
3. super block locates in No. 3 sector, either in block 0(2k, 4k size of block) or block1(1k size of block)
4. group description locates in the next block to super block.