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Disable udev rules on change event with DISK_RO=1.

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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
separately.
This commit is contained in:
Peter Rajnoha 2009-12-07 12:03:47 +00:00
parent 59baeb838c
commit 0d408f0c43
2 changed files with 8 additions and 0 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.41 -
====================================
Disable udev rules for change events with DISK_RO set.
Version 1.02.40 - 19th November 2009
====================================

7
udev/10-dm.rules.in
View File

@ -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.
ENV{DM_SBIN_PATH}="/sbin"
TEST!="$env{DM_SBIN_PATH}/dmsetup", ENV{DM_SBIN_PATH}="/usr/sbin"