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45 lines
2.1 KiB
Plaintext
45 lines
2.1 KiB
Plaintext
# Udev rules for device-mapper devices.
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#
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# These rules create a DM control node in /dev/(DM_DIR) directory.
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# The rules also create nodes named dm-x (x is a number) in /dev
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# directory and symlinks to these nodes with names given by
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# the actual DM names. Some udev environment variables are set
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# for use in later rules:
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# DM_NAME - actual DM device's name
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# DM_UUID - UUID set for DM device (blank if not specified)
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# DM_SUSPENDED - suspended state of DM device (0 or 1)
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KERNEL=="device-mapper", NAME="(DM_DIR)/control"
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SUBSYSTEM!="block", GOTO="dm_end"
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KERNEL!="dm-[0-9]*", GOTO="dm_end"
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ACTION!="add|change", GOTO="dm_end"
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# Normally, we operate on "change" events only. But when
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# coldplugging, there's an "add" event present. We have to
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# recognize this and do our actions in this particular
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# situation, too. Also, we don't want the nodes to be
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# created prematurely on "add" events while not coldplugging.
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ACTION=="add", ENV{STARTUP}!="1", NAME="", GOTO="dm_end"
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# "dm" sysfs subdirectory is available in newer versions of DM
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# only (kernels >= 2.6.29). We have to check for its existence
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# and use dmsetup tool instead to get the DM name, uuid and
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# suspended state if the "dm" subdirectory is not present.
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# The "suspended" item was added even later (kernels >= 2.6.31),
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# so we also have to call dmsetup if the kernel version used
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# is in between these releases.
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TEST=="dm", ENV{DM_NAME}="$attr{dm/name}", ENV{DM_UUID}="$attr{dm/uuid}", ENV{DM_SUSPENDED}="$attr{dm/suspended}"
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TEST!="dm", IMPORT{program}="/sbin/dmsetup info -j %M -m %m -c --nameprefixes --noheadings --rows -o name,uuid,suspended"
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ENV{DM_SUSPENDED}!="?*", IMPORT{program}="/sbin/dmsetup info -j %M -m %m -c --nameprefixes --noheadings --rows -o suspended"
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# dmsetup tool provides suspended state information in textual
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# form with values "Suspended"/"Active". We translate it to
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# 0/1 respectively to be consistent with sysfs values.
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ENV{DM_SUSPENDED}=="Active", ENV{DM_SUSPENDED}="0"
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ENV{DM_SUSPENDED}=="Suspended", ENV{DM_SUSPENDED}="1"
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ENV{DM_NAME}=="?*", NAME="$kernel", SYMLINK+="(DM_DIR)/$env{DM_NAME}"
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LABEL="dm_end"
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