[dm-devel] [PATCH] multipathd: restore paths after reconfigure

[Benjamin Marzinski]

On Thu, Jul 21, 2016 at 09:29:37AM -0700, Bart Van Assche wrote:
> On 07/01/2016 02:46 PM, Benjamin Marzinski wrote:
> >multipathd has code to finish gathering the information of paths that
> >were not active at the time they were discovered. When the checker loop
> >goes to check a path, and notices that it wasn't fully initialized, it
> >is supposed to complete the initialization.  However the code is broken.
> >This means that if you reconfigure multipathd while paths are down, they
> >will no longer be usable. This patch makes sure that check_path will
> >actually rerun pathinfo to finish setting up the path, so that after the
> >path comes back up, it will be usable again.
> >[ ... ]
> >@@ -1779,7 +1785,13 @@ checkerloop (void *ap)
> > 			lock(vecs->lock);
> > 			pthread_testcancel();
> > 			vector_foreach_slot (vecs->pathvec, pp, i) {
> >-				num_paths += check_path(vecs, pp, ticks);
> >+				rc = check_path(vecs, pp, ticks);
> >+				if (rc < 0) {
> >+					vector_del_slot(vecs->pathvec, i);
> >+					free_path(pp);
> >+					i--;
> >+				} else;
> >+					num_paths += rc;
> > 			}
> > 			lock_cleanup_pop(vecs->lock);
> > 		}
> 
> Hi Ben,
> 
> Was the semicolon after the "else" intended or was it a typo?

Oops! That was a typo. I'll send off a quick patch. Thanks for catching
that.

-Ben

> 
> Thanks,
> 
> Bart.