Mike Fleetwood authored Jul 12, 2016 and Curtis Gedak committed Aug 06, 2016

Creation of every BlockSpecial object used to result in a stat() OS
call.  On one of my test VMs debugging with 4 disks and a few partitions
on each, GParted refresh generated 541 calls to stat() in the
BlockSpecial(name) constructor.  However there were only 45 unique
names.  So on average each name was stat()ed approximately 12 times.

Cache the major, minor number associated with each name after starting
with a cleared cache for each GParted refresh.  This reduces these
direct calls to stat() to just the 45 unique names.

Bug 767842 - File system usage missing when tools report alternate block
             device names