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