I need help analyzing a failed UBIfs

[Atlant Schmidt]

Folks:

  I've been asked to analyze a 2GB NAND flash that contains
  a single volume UBIfs file system that has developed an
  uncorrectable ECC error in one PEB (which is apparently
  in use storing a LEB).

  The one thing I'd really like to determine is:

    o Is the failed LEB part of the UBIfs "Wandering
      Journal" or is it storing actual, fully-committed
      parts of the data volume such as iNodes, directories,
      or file data extents?*

  Looking at a data dump of the volume (from the MTD
  level), is there an easy way to determine this?
  For example, "All the Journal LEBs are listed in
  a table at..."**

                          Atlant


 * I'm assuming that LEBs are either fully-allocated to
   the Wandering Journal or fully-available to the "data
   volume"; if this assumption is incorrect, I'm sure
   someone will correct me!

** I have a Perl script that I wrote that helps me automate
   this and could easily extend my script to do more analysis
   if I knew what I was looking for.



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