Re: How to write a file system?
H. Peter Anvin (hpa@transmeta.com)
18 Sep 1997 16:29:25 GMT
Followup to: <Pine.LNX.3.95.970918155733.5431A-100000@pc7537.hil.siemens.at>
By author: Ingo Molnar <mingo@pc7537.hil.siemens.at>
In newsgroup: linux.dev.kernel
>
> > Does anyone have in-depth information on how to write a file
> > system driver? I've read the part about file systems in the
> > Kernel Hackers Guide, but it's not very detailed.
>
> this isnt very detailed information, but anyway: look at patches which add
> a new filesystem. Eg fs/romfs around 2.1.20, or autofs. Cut out the diffs
> that add the new filesystem, and change all occurences to your 'newfs'
> string. That should give you a good skeleton to start. Try to implement a
> filesystem first that has a single inode, and sprintf() some 'Hello World'
> string if someone wants to know the content of the inode :)
>
> then add physical layout, more inodes, directories, etc. It's easy ;)
>
The book "Linux Kernel Internals" by Beck, Böhme, et al is a very good
reference, and really helped me get started with the VFS layer
interface. It is mostly accurate for 2.0.x still; 2.1.x is
*completely* different because of the new dentry mechanism...
-hpa
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