On Fri, Nov 22, 2024 at 10:54:31PM +0100, Martin Wilck wrote:
> On Fri, 2024-11-22 at 16:11 -0500, Benjamin Marzinski wrote:
> > Multipath already notices if there is any empty device with the same
> > alias and wwid as a device it is trying to create, and switches to a
> > reload. However, if the empty device has a different alias but the
> > same
> > wwid, instead of reloading and renaming the device like it would for
> > a device with a table. multipath will attempt to create a new device
> > and fail.
> >
> > Fix this by checking for these devices, and doing a reload and
> > rename.
> >
> > Signed-off-by: Benjamin Marzinski <[email protected]>
> > ---
> > libmultipath/configure.c | 21 ++++++++++++++++++++-
> > 1 file changed, 20 insertions(+), 1 deletion(-)
> >
> > diff --git a/libmultipath/configure.c b/libmultipath/configure.c
> > index a7257981..d0e9c958 100644
> > --- a/libmultipath/configure.c
> > +++ b/libmultipath/configure.c
> > @@ -835,7 +835,6 @@ int domap(struct multipath *mpp, char *params,
> > int is_daemon)
> > {
> > int r = DOMAP_FAIL;
> > struct config *conf;
> > - char wwid[WWID_SIZE];
> >
> > /*
> > * last chance to quit before touching the devmaps
> > @@ -846,6 +845,7 @@ int domap(struct multipath *mpp, char *params,
> > int is_daemon)
> > }
> >
> > if (mpp->action == ACT_CREATE) {
> > + char wwid[WWID_SIZE];
> > int rc = dm_get_wwid(mpp->alias, wwid,
> > sizeof(wwid));
> >
> > if (rc == DMP_OK && !strncmp(mpp->wwid, wwid,
> > sizeof(wwid))) {
> > @@ -863,7 +863,26 @@ int domap(struct multipath *mpp, char *params,
> > int is_daemon)
> > mpp->action = ACT_REJECT;
> > }
> > }
> > + if (mpp->action == ACT_CREATE) {
> > + char alias[WWID_SIZE];
> > + int rc = dm_find_map_by_wwid(mpp->wwid, alias,
> > NULL);
> >
> > + if (rc == DMP_NO_MATCH) {
> > + condlog(1, "%s: wwid \"%s\" already in use
> > by non-multipath map \"%s\"",
> > + mpp->alias, mpp->wwid, alias);
>
> Nitpick: This is almost the same message that dm_find_map_by_wwid() has
> printed immediately before. Similar messages are also printed in all
> other callers of dm_find_map_by_wwid(). I suggest that we either remove
> the log message in the callers or in dm_find_map_by_wwid() itself.
> Probably the latter, then we can decide on a case by case basis in the
> caller whether the situation needs to be logged.
I'm confused here. dm_find_map_by_wwid() doesn't print any message
itself. It calls libmp_mapinfo__(), which could print either:
condlog(lvl, "%s: map %s has multiple targets", fname__, map_id);
or:
condlog(lvl, "%s: target type mismatch: \"%s\" != \"%s\"",
fname__, tgt_type, target_type);
in this case, but at level 4 verbosity, and these are used to
distinguish between the various reasons why DMP_NO_MATCH could be
returned, which seems like a reasonable thing at that verbosity.
-Ben
>
> Martin
