[PATCH] Rbd: add listwatchers command

[Li Wang <liwang@ubuntukylin.com>]

Currently, RBD does not provide an easy way to 
consult who opened a specied image, this complicates
the cloud maintenance, sometimes the administrator 
found that a RBD image could not be deleted with 
an error 'image has watchers', but no further 
information available. The RADOS has a command to 
show the watchers of an object, but the commands 
at RADOS level are not supposed to be exposed to a 
cloud administrator, and it is not clear for a 
non-expert administrator to how to associate an 
opened RBD with a corresponding watched object. 
This motivates us to add an RBD command to list the 
information of the clients who opened a RBD image to 
facilitate the cloud maintenance.

The patches are at:
https://github.com/ceph/ceph/pull/3435

Yunchuan Wen (3):
  rbd: add listwatchers command to list the watchers of an image
  test: add rbd listwatchers to src/test/cli/rbd/help.t
  man: add rbd listwatchers to doc/man/8/rbd.rst

 doc/man/8/rbd.rst       |  3 +++
 src/rbd.cc              | 63 +++++++++++++++++++++++++++++++++++++++++++++++--
 src/test/cli/rbd/help.t |  1 +
 3 files changed, 65 insertions(+), 2 deletions(-)

-- 
1.9.1