tree 35365e371b773d62011c2a0fe0cef154d585e72a
parent 4872ec1edc14d26d1404292b447034ad60c3adcf
author Jan Stancek <jstancek@redhat.com> 1652789619 +0200
committer Jan Stancek <jstancek@redhat.com> 1652954868 +0200

tst_find_backing_dev: match mount point if major/minor can't be found

ioctl_loop05 fails on btrfs, because tst_find_backing_dev doesn't find
major/minor returned by stat()

Per https://lwn.net/Articles/866582
  "btrfs allocates a separate device number (the usual major/minor pair)
  for each subvolume ... and call to on a file within a subvolume will
  return a device number that does not exist in files like mountinfo."

As fallback, if there's no major/minor match, use best match of mount path.

Signed-off-by: Jan Stancek <jstancek@redhat.com>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>