RTEMS Filesystem check

[Wendell Silva]

Hi Joel,

Yes, I've looked at the debugrfs command. Its implementation pointed me
some directions.
Now I'm doing my "home work", studying the RFS implementation, in order to
better understand the valuable advice from Chris.

Thanks

--Wendell.



2013/11/30 Joel Sherrill <joel.sherrill at oarcorp.com>

> On 11/30/2013 5:55 PM, Wendell Silva wrote:
> > Hello,
> >
> > I'm testing RTEMS RFS file system using qemu (pc386) and huge virtual
> > disk file (10G).
> > I've created a rfs partition with 8GB with a block size = 4096, which
> > allows for huge single file (~ 21 GiB).
> >
> > The test program (adapted from fileio example) uses synchronized cache
> > and create large files (~1GiB). After creation, the file is deleted and
> > during the deletion I just close the qemu window in order to simulate a
> > system crash an assess the impact of such event on the file system
> > integrity.
> >
> > After repeating this (destructive) test lots of times, I've found that
> > rfs survives well, but the free disc space is inconsistent because of
> > the non-deleted (marked as free) blocks.
> >
> > The question is: is there any program/example on how to "sanitize" an
> > RFS filesystem, in order the recover these lost/orphans blocks?
> > Something like checkdisk.
> >
> > If such code does not exist, can you provide me directions on how to do
> > that? I think this could be an interesting contribution.
>
> Chris Johns should comment on this as it is his filesystem. :)
>
> Have you looked at the debugrfs shell command? I don't know what
> it can do but may be helpful.  I don't think it can do what you
> need based on the manual page.
>
>
> http://rtems.org/onlinedocs/doc-current/share/rtems/html/shell/File-and-Directory-Commands-debugrfsut-_002d-debug-RFS-file-system.html#File-and-Directory-Commands-debugrfs-_002d-debug-RFS-file-system
>
> Looks like an area needing contributions. Hopefully Chris will
> pipe up soon but I think he was traveling.
>
> > --Wendell.
> >
> >
> >
>
>
>
> --
> Joel Sherrill, Ph.D.             Director of Research & Development
> joel.sherrill at OARcorp.com        On-Line Applications Research
> Ask me about RTEMS: a free RTOS  Huntsville AL 35805
> Support Available                (256) 722-9985
>
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