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Set DM_UDEV_DISABLE_OTHER_RULES_FLAG for suspended DM devices in udev rules.

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This is to avoid any scanning and processing of DM devices while they are in
suspended state (e.g. a rename while the device is suspended - a CHANGE event
is generated!). Otherwise, any scanning in the rules could end up with locking
the calling process until the device is resumed and so we don't receive a
notification about udev rules completion until then (and that effectively
locks out the process awaiting the notification!).

However, we still keep 'disk' and any 'subsystem' related udev rules running.
We trust these and these should check themselves whether a device is suspended
or not, not trying to run any scanning if it is.
This commit is contained in:
Peter Rajnoha 2011-01-28 11:41:51 +00:00
parent 8440981845
commit 2fef22fa85
2 changed files with 6 additions and 0 deletions
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1
WHATS_NEW_DM
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@ -1,5 +1,6 @@
Version 1.02.62 - Version 1.02.62 -
=================================== ===================================
Set DM_UDEV_DISABLE_OTHER_RULES_FLAG for suspended DM devices in udev rules.
Initialize pool object for each row in _output_as_rows(). Initialize pool object for each row in _output_as_rows().
Version 1.02.61 - 10th January 2011 Version 1.02.61 - 10th January 2011

5
udev/10-dm.rules.in
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@ -119,6 +119,11 @@ ENV{DM_UUID}=="mpath-?*", ENV{DM_ACTION}=="PATH_FAILED", GOTO="dm_disable"
ENV{DM_UUID}=="CRYPT-TEMP-?*", GOTO="dm_disable" ENV{DM_UUID}=="CRYPT-TEMP-?*", GOTO="dm_disable"
ENV{DM_UUID}!="?*", ENV{DM_NAME}=="temporary-cryptsetup-?*", GOTO="dm_disable" ENV{DM_UUID}!="?*", ENV{DM_NAME}=="temporary-cryptsetup-?*", GOTO="dm_disable"
# Avoid processing and scanning a DM device in the other (foreign)
# rules if it is in suspended state. However, we still keep 'disk'
# and 'DM subsystem' related rules enabled in this case.
ENV{DM_SUSPENDED}=="1", ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="1"
GOTO="dm_end" GOTO="dm_end"
LABEL="dm_disable" LABEL="dm_disable"