On Thu, 2018-04-12 at 13:47 -0500, Benjamin Marzinski wrote: > On Wed, Apr 04, 2018 at 06:16:26PM +0200, Martin Wilck wrote: > > This activates "smart" path detection. This is similar to > > "find_multipaths yes", but doesn't generally ignore single paths > > that are not listed in the WWIDs file. Rather, such paths are > > temporarily treated like multipath members. If no additional paths > > are detected after a certain time, the paths are re-added to the > > system as non-multipath. This needs support by the udev rules, to > > be added in a follow-up patch. > > > > If a multipath map is successfully successfully created, and paths > > are > > in waiting state, trigger path uevents to update their status. > > > > Signed-off-by: Martin Wilck <mwi...@suse.com> > > --- > > libmultipath/configure.c | 15 ++++++++++++--- > > libmultipath/dict.c | 1 + > > multipath/multipath.conf.5 | 13 +++++++++++++ > > 3 files changed, 26 insertions(+), 3 deletions(-) > > > > diff --git a/libmultipath/configure.c b/libmultipath/configure.c > > index 9aa3d21..17c2fa1 100644 > > --- a/libmultipath/configure.c > > +++ b/libmultipath/configure.c > > @@ -12,6 +12,7 @@ > > #include <string.h> > > #include <sys/file.h> > > #include <errno.h> > > +#include <ctype.h> > > #include <libdevmapper.h> > > #include <libudev.h> > > #include "mpath_cmd.h" > > @@ -476,9 +477,17 @@ trigger_paths_udev_change(struct multipath > > *mpp, bool is_mpath) > > env = udev_device_get_property_value( > > pp->udev, > > "DM_MULTIPATH_DEVICE_PATH"); > > > > - if (is_mpath && env != NULL && > > !strcmp(env, "1")) > > - continue; > > - else if (!is_mpath && > > If DM_MULTIPATH_DEVICE_PATH=1 then there has already been a uevent > where > udev recognized that the device should be claimed. Wouldn't udev > have > stopped the timer then? I don't see why this is necessary.
I set DM_MULTIPATH_DEVICE_PATH=1 in the "pretend_mpath" section in multipath.rules in the "maybe" case. The value DM_MULTIPATH_DEVICE_PATH=2 is never passed on to other udev rules, and never seen by multipathd. The reason I did that was that rules may have checks like 'DM_MULTIPATH_DEVICE_PATH!="1", ...' and I wanted to avoid these to be run in the "maybe" case, which, for all actors above multipath, should be temporarily treated like "yes". I hope this explains it. Martin -- Dr. Martin Wilck <mwi...@suse.com>, Tel. +49 (0)911 74053 2107 SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) -- dm-devel mailing list dm-devel@redhat.com https://www.redhat.com/mailman/listinfo/dm-devel
