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vdev_id: Create symlinks even if no /dev/mapper/

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vdev_id uses the /dev/mapper/ symlinks to resolve a UUID to a dm name
(like dm-1).  However on some multipath setups, there is no /dev/mapper/
entry for the UUID at the time vdev_id is called by udev.  However,
this isn't necessarily needed, as we may be able to resolve the dm
name from the $DEVNAME that udev passes us (like DEVNAME="/dev/dm-1").

This patch tries to resolve the dm name from $DEVNAME first, before
falling back to looking in /dev/mapper/.  This fixed an issue where the
by-vdev names weren't reliably showing up on one of our nodes.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #11698
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Tony Hutter 2021-03-08 08:43:30 -08:00 committed by GitHub
parent b2eebe3ae7
commit 4fdbd43450
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1 changed files with 8 additions and 1 deletions
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cmd/vdev_id/vdev_id
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@ -298,8 +298,15 @@ sas_handler() {
# Utilize DM device name to gather subordinate block devices
# using sysfs to avoid userspace utilities
DMDEV=$(ls -l --full-time /dev/mapper | grep $DM_NAME |
# If our DEVNAME is something like /dev/dm-177, then we may be
# able to get our DMDEV from it.
DMDEV=$(echo $DEVNAME | sed 's;/dev/;;g')
if [ ! -e /sys/block/$DMDEV/slaves/* ] ; then
# It's not there, try looking in /dev/mapper
DMDEV=$(ls -l --full-time /dev/mapper | grep $DM_NAME |
awk '{gsub("../", " "); print $NF}')
fi
# Use sysfs pointers in /sys/block/dm-X/slaves because using
# userspace tools creates lots of overhead and should be avoided