[Bug 789229] Re: using a blacklist and a blacklist_exception section results in multipathd filtering out paths it shouldn't

[Clint Byrum]

Thanks Craig, well done! I sponsored the uploads to lucid,maverick,and
natty -proposed. Unsubsribing sponsors, re-subscribing ubuntu-sru.

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https://bugs.launchpad.net/bugs/789229

Title:
  using a blacklist and a blacklist_exception section results in
  multipathd filtering out paths it shouldn't

Status in “multipath-tools” package in Ubuntu:
  Fix Released
Status in “multipath-tools” source package in Lucid:
  In Progress
Status in “multipath-tools” source package in Maverick:
  In Progress
Status in “multipath-tools” source package in Natty:
  In Progress

Bug description:
  Binary package hint: multipath-tools

  The issue is due to a bug in some if/then logic in
  blacklist.c:_filter_path resulting in the routine returning a value
  other then 0 for anything found on the exceptions list.

  SRU Justification:
  1. Impact: a config which (correctly) finds an entry both in blacklist and blacklist exceptions will not honor the exception
  2. How bug was addressed: an upstream fix was pulled in.  The root cause was that return values from functions checking existence in blacklists were being misinterpreted.
  3. Minimal patch: see debdiff in comment #6.
  4. TEST CASE: Create a multipath config with /dev/sda in both blacklist and blacklist exception.  /dev/sda won't be used.
  5. Regression potential: this commit has been upstream since 2007, so should cause no regressions.

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