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9738a02d3d
If using persistent filter and we're refreshing filters (just like we
do for pvcreate now after commit 54685c20fc),
we can't rely on getting the primary device of the partition from the cache
as such device could be already filtered by persistent filter and we get
a device cache lookup failure for such device.
For example:
$ lvm dumpconfig --type diff
devices {
obtain_device_list_from_udev=0
}
$lsblk /dev/sda
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 128M 0 disk
`-sda1 8:1 0 127M 0 part
$cat /etc/lvm/cache/.cache | grep sda
"/dev/sda1",
$pvcreate /dev/sda1
dev_is_mpath: failed to get device for 8:1
Physical volume "/dev/sda1" successfully created
The problematic part of the code called dev_cache_get_by_devt
to get the device for the device number supplied. Then the code
used dev_name(dev) to get the name which is then used in check
whether there's any mpath on top of this dev...
This patch uses sysfs to get the base name for the partition
instead, hence avoiding the device cache which is a correct
approach here.