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2f5ddfbade
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...
85 lines
3.6 KiB
Plaintext
85 lines
3.6 KiB
Plaintext
# Copyright (C) 2012 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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# Scan all block devices having a PV label for LVM metadata.
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# Store this information in LVMetaD (the LVM metadata daemon) and maintain LVM
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# metadata state for improved performance by avoiding further scans while
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# running subsequent LVM commands or while using lvm2app library.
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# Also, notify LVMetaD about any relevant block device removal.
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#
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# This rule is essential for having the information in LVMetaD up-to-date.
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# It also requires blkid to be called on block devices before so only devices
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# used as LVM PVs are processed (ID_FS_TYPE="LVM2_member" or "LVM1_member").
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SUBSYSTEM!="block", GOTO="lvm_end"
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(LVM_EXEC_RULE)
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ENV{DM_NOSCAN}=="1", GOTO="lvm_end"
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# If the PV label got lost, inform lvmetad immediately.
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# Detect the lost PV label by comparing previous ID_FS_TYPE value with current one.
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ENV{.ID_FS_TYPE_NEW}="$env{ID_FS_TYPE}"
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IMPORT{db}="ID_FS_TYPE"
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ENV{ID_FS_TYPE}=="LVM2_member|LVM1_member", ENV{.ID_FS_TYPE_NEW}!="LVM2_member|LVM1_member", ENV{LVM_PV_GONE}="1"
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ENV{ID_FS_TYPE}="$env{.ID_FS_TYPE_NEW}"
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ENV{LVM_PV_GONE}=="1", GOTO="lvm_scan"
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# Only process devices already marked as a PV - this requires blkid to be called before.
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ENV{ID_FS_TYPE}!="LVM2_member|LVM1_member", GOTO="lvm_end"
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ENV{DM_MULTIPATH_DEVICE_PATH}=="1", GOTO="lvm_end"
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# Inform lvmetad about any PV that is gone.
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ACTION=="remove", GOTO="lvm_scan"
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# If the PV is a special device listed below, scan only if the device is
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# properly activated. These devices are not usable after an ADD event,
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# but they require an extra setup and they are ready after a CHANGE event.
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# Also support coldplugging with ADD event but only if the device is already
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# properly activated.
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# DM device:
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KERNEL!="dm-[0-9]*", GOTO="next"
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ENV{DM_UDEV_PRIMARY_SOURCE_FLAG}=="1", ENV{DM_ACTIVATION}=="1", GOTO="lvm_scan"
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GOTO="lvm_end"
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# MD device:
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LABEL="next"
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KERNEL!="md[0-9]*", GOTO="next"
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IMPORT{db}="LVM_MD_PV_ACTIVATED"
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ACTION=="add", ENV{LVM_MD_PV_ACTIVATED}=="1", GOTO="lvm_scan"
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ACTION=="change", ENV{LVM_MD_PV_ACTIVATED}!="1", TEST=="md/array_state", ENV{LVM_MD_PV_ACTIVATED}="1", GOTO="lvm_scan"
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GOTO="lvm_end"
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# Loop device:
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LABEL="next"
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KERNEL!="loop[0-9]*", GOTO="next"
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ACTION=="add", ENV{LVM_LOOP_PV_ACTIVATED}=="1", GOTO="lvm_scan"
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ACTION=="change", ENV{LVM_LOOP_PV_ACTIVATED}!="1", TEST=="loop/backing_file", ENV{LVM_LOOP_PV_ACTIVATED}="1", GOTO="lvm_scan"
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GOTO="lvm_end"
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# If the PV is not a special device listed above, scan only after device addition (ADD event)
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LABEL="next"
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ACTION!="add", GOTO="lvm_end"
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LABEL="lvm_scan"
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# The table below summarises the situations in which we reach the LABEL="lvm_scan".
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# Marked by X, X* means only if the special dev is properly set up.
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# The artificial ADD is supported for coldplugging. We avoid running the pvscan
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# on artificial CHANGE so there's no unexpected autoactivation when WATCH rule fires.
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# N.B. MD and loop never actually reaches lvm_scan on REMOVE as the PV label is gone
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# within a CHANGE event (these are caught by the "LVM_PV_GONE" rule at the beginning).
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#
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# | real ADD | real CHANGE | artificial ADD | artificial CHANGE | REMOVE
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# =============================================================================
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# DM | | X | X* | | X
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# MD | | X | X* | |
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# loop | | X | X* | |
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# other | X | | X | | X
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RUN+="(LVM_EXEC)/lvm pvscan --background --cache --activate ay --major $major --minor $minor", ENV{LVM_SCANNED}="1"
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LABEL="lvm_end"
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