Does UBI LEB-level access interlock happily with UBIfs access?

[Atlant Schmidt]

Folks:

  We use the ordinary MTD/UBI/UBIfs stack on our
  Embedded Linux system.

  For the purposes of scrubbing-out single bit errors,
  I'd like to read through all of the LEBs stored in the
  UBI device and whenever the ECC information indicates
  that any correctable errors occurred, I'd like to
  *RE-WRITE* that LEB (thereby forcing it to be scrubbed).
  (Note: I might do this page-by-page rather than LEB-
  by-LEB.)

  But I would expect that because I'd have a hard
  (impossible?) time doing an atomic read/re-write of a
  LEB (or page), the UBIfs and my scrubber would interact
  badly with my scrubber eventually corrupting the UBIfs
  file system. Is there any easy way to interlock these
  accesses (from the UBIfs and from my UBI-level scrubber)?
  A way to temporarily suspend activity from the UBIfs?

  One kludge that might work is that I'm operating in a
  real-time environment. If I made my scrubbing requests
  from a very high priority (higher than the "System"
  tasks that run around Priority 50), could I be sure
  my read + rewrite scrubbing requests would at least
  enter the UBI's work queue immediately adjacent to
  each other (and without UBIfs requests intermingled)?

  Alternatively, I could probably dismount the UBIfs
  before doing scrubbing, but I'd rather not have to
  do that.
                          Atlant


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