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[lvm-devel][PATCH] Disable udev rules on change event with DISK_RO=1

There's a new change udev event generated since kernel 2.6.32 that
notifies userspace about a change in read-only attribute for block
devices (with DISK_RO=1 environment variable set):


We need to detect this and disable the rule application so the
meaning of this change event is not interchanged with the regular
change event used while resuming/renaming DM devices.

If there's anybody awaiting this notification in foreign rules,
he can still check for this env var and do the appropriate actions


diff --git a/udev/10-dm.rules.in b/udev/10-dm.rules.in
index aba0bf4..7cffc0b 100644
--- a/udev/10-dm.rules.in
+++ b/udev/10-dm.rules.in
@@ -19,6 +19,13 @@ KERNEL=="device-mapper", NAME="(DM_DIR)/control"
 SUBSYSTEM!="block", GOTO="dm_end"
 KERNEL!="dm-[0-9]*", GOTO="dm_end"
+# There is a new change event generated in block layer since kernel
+# version 2.6.32. It adds notification for changes in read-only
+# attribute. We don't want to misinterpret the regular meaning of change
+# events for DM devices and we don't want to apply the rules prematurely,
+# therefore we disable them in this situation.
+ENV{DISK_RO}=="1", GOTO="dm_disable"
 # Set proper sbin path, /sbin has higher priority than /usr/sbin.
 TEST!="$env{DM_SBIN_PATH}/dmsetup", ENV{DM_SBIN_PATH}="/usr/sbin"

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