Links to understand File System

[Stefan Tatschner]

On Wed, 2015-04-22 at 13:35 +0530, victorascroft at gmail.com wrote:
> Hi,
> 
> On 15-04-22 12:47:54, sahil aggarwal wrote:
> > Hi all,
> > 
> > I am reading Understanding the linux kernel CH15(ext2 and ext3 file
> > systems) and have even started implementation of File system from
> > scratch for learning purpose by following this :
> > 
> > https://github.com/psankar/simplefs
> > 
> > Any leads on other links/papers to understand VFS->FS->disk flow 
> > better.?
> 
> Have a look at the kernel books by Robert Love and Bovet,Cesati.
> 
> Also http://www.nongnu.org/ext2-doc/ext2.html
> 
> Also for what its worth, since you are interested in FS and how they 
> are 
> implemented
> 
> http://pages.cs.wisc.edu/~remzi/OSTEP/
> 
> Have a look at the chapters in Persistence. The chapters have pretty 
> good explanations and also note various papers related to file 
> systems 
> which you can go through.
> 
> In addition you might find the following of interest as well
> 
> http://pdos.csail.mit.edu/6.828/2014/xv6.html
> You can understand the FS structure in xv6 and start doing your own 
> improvements on it. For example, xv6 currently uses the 
> direct/indirect 
> pointer strategy which you can improve to increase max file size 
> which 
> xv6 currently uses. OR do an extent based file system improvement. 
> Direct/indirect pointer strategy is used in ext2/3 and ext4 uses 
> extents. So you can play around in xv6 to learn more about FS while 
> also 
> cross referencing other FS. And since you do all testing in qemu no 
> worries of actually breaking stuff.
> 
> You also might want to look at xinu, though I have yet to mess 
> around in 
> what xinu uses in FS.
> 
> Hope that helps a bit.

Nice links! Thank you very much!

Stefan