[LU-9405] mount.lustre parses device paths dumbly

Related — Thu, 23 Jul 2020 16:04:37 +0000

mount.lustre parses does some device path parsing to get find the paths of the block device tunables. From my comment on https://review.whamcloud.com/#/c/26399/ from ~~LU-9292~~:

I've never though that mount.lustre should be tuning the block devices. That's the responsibility of admins and/or integrators.
Assuming we do want to do it, this is not a good way to go from partition to the blockdev tunables directory. sysfs is already setup for this and we can avoid easily breakable device path parsing:

 
major=0x$(stat --format=%t /dev/sdc1)
minor=0x$(stat --format=%T /dev/sdc1)
 
~$ readlink -f /sys/dev/block/$((major)):$((minor))/../queue
/sys/devices/pci0000:00/0000:00:1f.2/ata3/host3/target3:0:0/3:0:0:0/block/sdc/queue

if [[ -f /sys/dev/block/$((major)):$((minor))/partition ]]; then
  # Use /sys/dev/block/$((major)):$((minor))/../queue
else
  # Use /sys/dev/block/$((major)):$((minor))/queue
fi

Whamcloud Community JIRA

[LU-9405] mount.lustre parses device paths dumbly