[dm-devel] [PATCH] 11-dm-mpath.rules: dont't run "multipath -U" during coldplug

[Martin Wilck]

When udevadm trigger is run after switching root, lots of simultaneous uevents
for both path and multipath devices arrive. In may happen that when "multipath
-U" is called on a dm device, the path's uevents haven't finished yet, thus
the paths aren't found in the udev db, and multipath -U erroneously concludes
that there are no usable paths. Avoid that by skipping "multipath -U" during
coldplug.

Fixes: "ce5ea6a 11-dm-mpath.rules: multipath -U for READY check"
Signed-off-by: Martin Wilck <mwilck at suse.com>
---
 multipath/11-dm-mpath.rules | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/multipath/11-dm-mpath.rules b/multipath/11-dm-mpath.rules
index 03ac5da..07320a1 100644
--- a/multipath/11-dm-mpath.rules
+++ b/multipath/11-dm-mpath.rules
@@ -26,6 +26,10 @@ ENV{DM_NR_VALID_PATHS}=="0", ENV{MPATH_DEVICE_READY}="0", GOTO="mpath_action"
 ENV{MPATH_SBIN_PATH}="/sbin"
 TEST!="$env{MPATH_SBIN_PATH}/multipath", ENV{MPATH_SBIN_PATH}="/usr/sbin"
 
+# Don't run multipath -U during "coldplug" after switching root,
+# because paths are just being added to the udev db.
+ACTION=="add", ENV{.MPATH_DEVICE_READY_OLD}=="1", GOTO="paths_ok"
+
 # Check the map state directly with multipath -U.
 # This doesn't attempt I/O on the device.
 PROGRAM=="$env{MPATH_SBIN_PATH}/multipath -U %k", GOTO="paths_ok"
-- 
2.16.1