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udev: add a few comments about variables used to recognize events

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This commit is contained in:
Peter Rajnoha 2013-05-03 11:01:57 +02:00
parent f39f5b86c3
commit baf9ef2047
1 changed files with 18 additions and 0 deletions
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18
udev/10-dm.rules.in
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@ -77,11 +77,29 @@ LABEL="dm_flags_done"
# before (e.g. in initrd). If udev is used in initrd, we require the udev init
# script to not remove the existing udev database so we can reuse the information
# stored at the time of device activation in the initrd.
# The DM_ACTIVATION variable tells when any device stacked above should be
# (re)activated as well.
ACTION!="add", GOTO="dm_no_coldplug"
ENV{DM_UDEV_RULES_VSN}!="1", ENV{DM_UDEV_PRIMARY_SOURCE_FLAG}!="1", GOTO="dm_disable"
ENV{DM_ACTIVATION}="1"
LABEL="dm_no_coldplug"
# Putting it together, following table is used to recognize genuine and spurious events.
# N.B. Spurious events are generated based on use of the WATCH udev
# rule or by triggering an event manually by "udevadm trigger" call
# or by "echo <event_name> > /sys/block/dm-X/uevent".
#
# EVENT DM_UDEV_PRIMARY_SOURCE_FLAG DM_ACTIVATION
# ======================================================================
# add event (genuine) 0 0
# change event (genuine) 1 1
# add event (spurious)
# |_ dev still not active 0 0
# \_ dev already active 1 1
# change event (spurious)
# |_ dev still not active 0 0
# \_ dev already active 1 0
# "dm" sysfs subdirectory is available in newer versions of DM
# only (kernels >= 2.6.29). We have to check for its existence
# and use dmsetup tool instead to get the DM name, uuid and