[dm-devel] [PATCH v5 00/21] libmultipath: checkers overhaul

[Martin Wilck]

Hi Christophe,

This is v5 of my "checkers overhaul" series. Changed wrt v4
are 03/22, 11/22, and 21/22. I re-post the whole series to
avoid confusion.

This series starts with a few minor fixes and then attempts
an overhaul of the checker code.

First, there's a block of patches to get rid of the "message"
char array in struct checker, replacing it with an integer.
This topic had been touched in recent discussion between Ben
and myself. You may want to collaps the patches in this block
(03/21-11/21) into one when commiting; compilation errors will
arise if only part of them is a applied.

The next larger block fixes problems with checkers that try
to check unsupported devices. It's an interesting experience
to configure wrong checkers for the existing devices and see
what happens. With these patches, paths won't be falsely
teared down any more in such situations.

The last patch cleans up the checker data structure by splitting
it into a "checker class" and the path "checker instance".

There's more work to do in this area, but this is a start.

----
changes v4->v5
 - 03/21: made checker_message() const again, as 22/22 is gone.
   Got rid of the static buffer in checker_message() by simply returning
   the constant message strings, as suggested by Ben in his review of v4.
   This implies printf format changes in callers; changed format in get_state().
 - 11/21: Changed printf format in check_path() (see above).
 - 21/22: rebased, no actual changes (kept Ben's Reviewed-by).
 - 22/22: dropped, obsolete.

Changes v3->v4:
 - 03/22: renamed CHECKER_LAST_GENERIC_MSGID -> CHECKER_GENERIC_MSGTABLE_SIZE
          (Ben).
 - 12/22: rebased on top of changed 03/22.

Changes v2->v3:
 - 03/22: fixed one minor issue mentioned by Ben;
          reverted the const-ification of checker_message(),
	  as it will be reverted in 22/22 anyway.
 - 13/22: fix clariion checker semantics (Ben).
 - 21/22: rebased on top of updated 03/22.
 - 22/22: fix thread-safety issue from 03/22 (Ben).

Changes v1->v2:
 - 11/22: rebased on top of "various multipath-tools patches" series

Martin Wilck (21):
  libmultipath: fix use of uninitialized memory in write()
  libmultipath: fix memory leaks from scandir() use
  libmultipath/checkers: replace message by msgid
  libmultipath/checkers: cciss_tur: use message id
  libmultipath/checkers: directio: use message id
  libmultipath/checkers: emc_clariion: use message id
  libmultipath/checkers: hp_sw: use message id
  libmultipath/checkers: rdac: use message id
  libmultipath/checkers: readsector0: use message id
  libmultipath/checkers: tur: use message id
  multipathd: improve checker message logging
  libmultipath/checkers: support unsupported paths
  libmultipath: clariion checker: leave unsupported paths alone
  libmultipath: hp_sw checker: leave unsupported paths alone
  libmultipath: rdac checker: leave unsupported paths alone
  libmultipath: tur checker: leave unsupported paths alone
  libmultipath: pathinfo: don't blank wwid if checker fails
  multipathd: check_path: improve logging for "unusable path" case
  libmultipath: coalesce_paths: improve logging of orphaned paths
  libmultipath: sync_map_state: log failing paths
  libmultipath/checkers: cleanup class/instance model

 libmultipath/checkers.c              | 187 +++++++++++++++++----------
 libmultipath/checkers.h              |  69 ++++++----
 libmultipath/checkers/cciss_tur.c    |  13 +-
 libmultipath/checkers/directio.c     |  29 +++--
 libmultipath/checkers/emc_clariion.c | 114 +++++++++++++---
 libmultipath/checkers/hp_sw.c        |  39 +++---
 libmultipath/checkers/rdac.c         |  92 +++++++++----
 libmultipath/checkers/readsector0.c  |   7 +-
 libmultipath/checkers/tur.c          |  60 +++++----
 libmultipath/config.c                |  10 +-
 libmultipath/configure.c             |  10 +-
 libmultipath/discovery.c             |  11 +-
 libmultipath/foreign.c               |   5 +-
 libmultipath/foreign/nvme.c          |   6 +-
 libmultipath/print.c                 |   2 +-
 libmultipath/propsel.c               |  19 +--
 libmultipath/structs_vec.c           |   5 +-
 libmultipath/sysfs.c                 |   5 +-
 libmultipath/util.c                  |   9 ++
 libmultipath/util.h                  |   9 ++
 multipathd/main.c                    |  38 ++++--
 21 files changed, 497 insertions(+), 242 deletions(-)

-- 
2.19.1