linux2.6内核中如何添加新的文件系统

《边干边学 - linux内核指导》中教授了如何在2.4内核中添加myext2文件系统的方法。2.6内核中文件组织稍有变化，通过试验，方法如下：

1. 将fs/ext2拷贝一份为fs/myext2

2. cd fs/myext2

3. sed -i "s/ext2/myext2/g" *      //将fs/myext2目录下出现的所有ext2替换为myext2

4. sed -i "s/EXT2/MYEXT2/g" *      //将fs/myext2目录下出现的所有EXT2替换为MYEXT2

5. 复制include/linux/ext2_fs.h 和 include/linux/ext2_fs_sb.h 为myext2_fs.h 和 myext2_fs_sb.h，并类似于3、4替换所有ext2为myext2 （大写和小写）

6. cp include/asm-generic/bitops/ext2-non-atomic.h asm-generic/bitops/myext2-non-atomic.h，然后替换所有ext2为myext2（大写和小写）

7.在 include/asm/bitops.h中添加如下内容：

#include <asm-generic/bitops/ext2-non-atomic.h>
#define ext2_set_bit_atomic(lock,nr,addr) /
                test_and_set_bit((nr),(unsigned long*)addr)
#define ext2_clear_bit_atomic(lock,nr,addr) /
                test_and_clear_bit((nr),(unsigned long*)addr)
#include <asm-generic/bitops/myext2-non-atomic.h>
#define myext2_set_bit_atomic(lock,nr,addr) /
                test_and_set_bit((nr),(unsigned long*)addr)
#define myext2_clear_bit_atomic(lock,nr,addr) /
                test_and_clear_bit((nr),(unsigned long*)addr)

8. 修改make menuconfig中的编译选项：

vi fs/Kconfig

config FS_XIP
# execute in place
        bool
        depends on EXT2_FS_XIP
        default y

config MYEXT2_FS
        tristate "My Second extended fs support"
        help
          Myext2 is a experimental filesystem
          To compile this file system support as a module, choose M here: the
          module will be called myext2.  Be aware however that the file system
          of your root partition (the one containing the directory /) cannot
          be compiled as a module, and so this could be dangerous.
          If unsure, say Y.
config MYEXT2_FS_XATTR
        bool "Ext2 extended attributes"
        depends on MYEXT2_FS
        help
          Extended attributes are name:value pairs associated with inodes by
          the kernel or by users (see the attr(5) manual page, or visit
          <http://acl.bestbits.at/> for details).

照着EXT2的写就行了。

make menuconfig看一下，是不是发现多了几个编译选项？

9. make menuconfig

10. make -j4

11. make modules

12. make modules_install

13. make install

查看一下grub的配置（vi /etc/grub.conf）

重启即可。