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5eafaad441
When a device id is set for a device, using an idtype other than devname, it means that sysfs has been used with the device to match the device id. So, checking for a sysfs entry for the device in filter-sysfs is redundant. For any other cases not covered by this (e.g. devname ids), have filter-sysfs simply stat /sys/dev/block/major:minor to test if the device exists in sysfs. The extensive processing done by filter-sysfs init is removed. It was taking an immense amount of time with many devices, e.g. . 1024 PVs in 520 VGs . 520 concurrent vgchange -ay <vgname> commands . vgchange avoiding full device scanning by using pvs_online A large number of the vgchange commands were taking over 1 min, and nearly half of that time was used by filter-sysfs init. With this patch, the vgchange commands take about half the time.