[dm-devel] [PATCH 0/4] multipath-tools: prio handling for offline paths

[Benjamin Marzinski]

On Thu, Apr 11, 2019 at 12:49:19PM +0200, Martin Wilck wrote:
> A recent bug report revealed that the handling of path priorities is
> inconsistent in multipathd when paths fail. In the current code, depending
> on timing, the prio of a faild path may be reset to 0, reset to -1
> (PRIO_UNDEF), or not reset at all. The inconsistency is most obvious
> with "group_by_prio", as it results in strange artefacts how failed
> paths are regrouped, and how path groups are sorted.
> 
> This series tries to address these issues.
> 
> The general mind set that I applied is that, in case of doubt, it's
> best to retain the priority that was retrieved while the path was
> last accessible.

ACK for the set.

-Ben

> 
> Martin Wilck (4):
>   libmultipath: group_by_prio: fix signedness bug
>   Revert "Set priority to '0' for PATH_BLOCKED or PATH_DOWN"
>   libmultipath: ana prioritizer: decrease log level
>   libmultipath: get_prio(): don't reset prio for inaccessible paths
> 
>  libmultipath/discovery.c        | 16 +++++++++++-----
>  libmultipath/pgpolicies.c       |  2 +-
>  libmultipath/prioritizers/ana.c |  2 +-
>  3 files changed, 13 insertions(+), 7 deletions(-)
> 
> -- 
> 2.21.0