[dm-devel] [PATCH 0/3] mulitpathd: Handle losing all paths in update_map

[Martin Wilck]

On Tue, 2022-08-09 at 16:46 -0500, Benjamin Marzinski wrote:
> When users rapidly add and remove paths, it's possible for multipathd
> to
> delay updating the multipath device, and when if finally calls
> update_map(), find out that no paths remain for the device. When this
> happens, multipathd should act just like all the paths had been
> removed,
> attempting to remove the device, while respecting the
> flush_on_last_del
> and deferred_remove settings. Instead multipathd was simply reloading
> the map with no paths. This patchset fixes this.
> 
> Benjamin Marzinski (3):
>   multipathd: factor out the code to flush a map with no paths
>   libmultipath: return success if we raced to remove a map and lost
>   multipathd: Handle losing all path in update_map
> 
>  libmultipath/devmapper.c |  4 +++
>  multipathd/main.c        | 64 +++++++++++++++++++++-----------------
> --
>  2 files changed, 37 insertions(+), 31 deletions(-)
> 

For the set:
Reviewed-by: Martin Wilck <mwilck at suse.com>