[dm-devel] [PATCH 00/80] multipath-tools series part VI: incomplete udev initialization

[mwilck at suse.com]

From: Martin Wilck <mwilck at suse.com>

Hi Christophe, hi Ben,

This is part VI of a larger patch series for multipath-tools I've been preparing.
It's based on the previously submitted part V.

The full series will also be available here:
https://github.com/mwilck/multipath-tools/tree/ups/submit-2007

There are tags in that repo for each part of the series.
This part is tagged "submit-200709-6".

The series handles an issue observed in certain partner installations, where
DM devices were incompletely initialized by udev - during initrd procesing,
the "add" event had been processed, but the subsequent "change" event had not,
because udevd had been killed before getting around to handle them.

My first attempt to fix this was based on udev rules ("11-dm-mpath.rules: Fix
udev rule processing during coldplug"), but this patch was wrong. We have to
add logic in multipathd itself. The most important patch in the series that
fixed the actual customer problem is patch 76. Patch 75 was supposed to handle
a slightly different incarnation of the same problem, which so far hasn't been
actually observed. But I think having this patch "just in case" doesn't hurt,
either.

Patch 78 and 79 rename "update_path_groups()", which over time has grown
to be the main entry point for reloading maps.

Patch 80 fixes an issue which I observed while testing the first 3 patches.

Regards,
Martin

Martin Wilck (6):
  multipathd: uev_trigger(): handle incomplete ADD events
  libmultipath: select_action(): force udev reload for uninitialized
    maps
  libmultipath: log dm_task_run() errors
  libmultipath: move reload_map() to multipathd
  multipathd: rename update_path_groups() -> reload_and_sync_map()
  libmultipath: select_action(): don't drop map if alias clashes

 libmultipath/configure.c  | 112 +++++++++++++++-----------------------
 libmultipath/configure.h  |   3 +-
 libmultipath/devmapper.c  |  61 +++++++++++++++++----
 libmultipath/devmapper.h  |   4 ++
 multipathd/cli_handlers.c |   8 +--
 multipathd/dmevents.c     |   4 +-
 multipathd/main.c         |  71 ++++++++++++++++++++++--
 multipathd/main.h         |   4 +-
 multipathd/waiter.c       |   2 +
 9 files changed, 178 insertions(+), 91 deletions(-)

-- 
2.26.2