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Recognize DM_SUBSYSTEM_UDEV_FLAG0 which for LVM is the "LVM_NOSCAN" flag that causes the scanning to be skipped (mainly blkid) and also directs all the foreign rules to be skipped as well. Important thing here is that the "watch" udev rules is still set as well as the /dev/disk/by-id content created (which does not require any scanning to be done). Also, the flag is dropped on any subsequent event and scanning done...
55 lines
2.4 KiB
Plaintext
55 lines
2.4 KiB
Plaintext
# Copyright (C) 2009 Red Hat, Inc. All rights reserved.
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#
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# This file is part of LVM2.
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# Udev rules for LVM.
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#
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# These rules create symlinks for LVM logical volumes in
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# /dev/VG directory (VG is an actual VG name). Some udev
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# environment variables are set (they can be used in later
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# rules as well):
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# DM_LV_NAME - logical volume name
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# DM_VG_NAME - volume group name
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# DM_LV_LAYER - logical volume layer (blank if not set)
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# "add" event is processed on coldplug only!
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ACTION!="add|change", GOTO="lvm_end"
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ENV{DM_UDEV_RULES_VSN}!="?*", GOTO="lvm_end"
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ENV{DM_UUID}!="LVM-?*", GOTO="lvm_end"
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# Use DM name and split it up into its VG/LV/layer constituents.
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IMPORT{program}="(DM_EXEC)/dmsetup splitname --nameprefixes --noheadings --rows $env{DM_NAME}"
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# DM_SUBSYSTEM_UDEV_FLAG0 is the 'NOSCAN' flag for LVM subsystem.
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# This flag is used to temporarily disable selected rules to prevent any
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# processing or scanning done on the LVM volume before LVM has any chance
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# to zero any stale metadata found within the LV data area. Such stale
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# metadata could cause false claim of the LV device, keeping it open etc.
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#
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# If the NOSCAN flag is present, backup selected existing flags used to
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# disable rules, then set them firmly so those selected rules are surely skipped.
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# Restore these flags once the NOSCAN flag is dropped (which is normally any
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# uevent that follows for this LV, even an artificially generated one).
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ENV{DM_SUBSYSTEM_UDEV_FLAG0}=="1", ENV{DM_NOSCAN}="1", ENV{DM_DISABLE_OTHER_RULES_FLAG_OLD}="$env{DM_UDEV_DISABLE_OTHER_RULES_FLAG}", ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="1"
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ENV{DM_SUBSYSTEM_UDEV_FLAG0}!="1", IMPORT{db}="DM_NOSCAN", IMPORT{db}="DM_DISABLE_OTHER_RULES_FLAG_OLD"
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ENV{DM_SUBSYSTEM_UDEV_FLAG0}!="1", ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="$env{DM_DISABLE_OTHER_RULES_FLAG_OLD}", \
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ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG_OLD}="", ENV{DM_NOSCAN}=""
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ENV{DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG}=="1", GOTO="lvm_end"
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OPTIONS+="event_timeout=180"
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# Do not create symlinks for inappropriate subdevices.
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ENV{DM_LV_NAME}=="pvmove?*|?*_vorigin", GOTO="lvm_disable"
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ENV{DM_LV_LAYER}=="?*", GOTO="lvm_disable"
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# Create symlinks for top-level devices only.
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ENV{DM_VG_NAME}=="?*", ENV{DM_LV_NAME}=="?*", SYMLINK+="$env{DM_VG_NAME}/$env{DM_LV_NAME}", GOTO="lvm_end"
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LABEL="lvm_disable"
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ENV{DM_UDEV_DISABLE_DISK_RULES_FLAG}="1"
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ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="1"
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OPTIONS:="nowatch"
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LABEL="lvm_end"
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