Why rbd map is failing when exclusive-lock, object-map, fast-diff and deep-flatten features are enabled in RBD image ?

Solution In Progress - Updated -

Issue

  • Why rbd map command is failing when exclusive-lock, object-map, fast-diff and deep-flatten features are enabled in RBD image ?
  • KRBD : rbd map command is failing, we should log correct error message either in system logs or in standard error output.
$rbd map rbd/test
rbd: sysfs write failed
rbd: map failed: (6) No such device or address

Environment

  • Red Hat Enterprise Linux 7.2
  • kernel-3.10.0-327.el7.x86_64

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