<aside> 💡 Make a file system module

</aside>

Making a file system module

• copying existing EXT4 file system module to my file system module. (PXT4 file system)
• EXT4 file system includes two modules.
  • ext4.ko : Body of file system (metadata, I/O operations)
  • jdb2.ko : Transaction processing
• To avoid conflict
  • ext4.ko → pxt4.ko
  • jdb2.ko → jdb3.ko

Cody original file system to out file system

$ cp -r linux-5.x.x/fs/ext4 pxt4
$ cp -r linux-5.x.x/fs/jdb2 jdb3

Modify codes

use ‘cscope’

1. pxt4, jdb3 directory

**$ cscope**

1. change codes & the name of files

   • jdb2 → jdb3, ext4 → pxt4, ext2, pxt2
   • JDB2 → JDB3, EXT4 → PXT4, EXT2 → PXT2
   • ctrl + A : to choose all the codes to change

   <aside> ⚠️ Makefile, config file 도 변경해줘야 한다 !

   </aside>

2. /pxt4/acl.h

   • #ifdef CONFIG_PXT4 → #ifdef CONFIG_EXT4

3. /pxt4/xattr.h

   • #ifdef CONFIG_PXT4 → #ifdef CONFIG_EXT4