On Sat, 14 Apr 2018 00:00:02 +0200 Martin Wilck <mwilck@xxxxxxxx> wrote: > Create a simple API that indicates failure to create a map for a > certain WWID. This will allow multipathd to indicate to other tools > (in particular, "multipath -u" during udev processing) that > an attempt to create a map for a certain wwid failed. > > The indicator is simply the existence of a file under > /dev/shm/multipath/failed_wwids. This has been chosen because it > "survives" during pivot-root between initrd and root file system. > > The exact semantics of /dev/shm/multipath/failed_wwids/$WWID is: > "multipath or multipathd has tried to create this map from its > members with a DM_DEVICE_CREATE call, and failed on the latest, > or only, attempt to do so". > > In particular, the existence of the file proves that here was at > least one unsuccessful attempt to create the map since the last > reboot. On the contrary, the non-existence of this file does not > indicate a successful attempt - perhaps multipathd never tried to > set up the map. > > Signed-off-by: Martin Wilck <mwilck@xxxxxxxx> > Reviewed-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx> > --- > libmultipath/defaults.h | 1 + > libmultipath/wwids.c | 110 > ++++++++++++++++++++++++++++++++++++++++++++++++ > libmultipath/wwids.h | 11 +++++ 3 files changed, 122 insertions(+) > Reviewed-by: Hannes Reinecke <hare@xxxxxxxx> Cheers, Hannes -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
