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Description of problem:

With the recent block-level saveconfig fix,


Create:
---------

# targetcli /backstores/user:glfs/block create ...
# targetcli /backstores/user:glfs/block saveconfig

This works.


Modify:
--------

# targetcli /backstores/user:glfs/block set dev_size=NEW
# targetcli /backstores/user:glfs/block saveconfig

This also works.


Delete:
--------

# targetcli /backstores/user:glfs/block delete
[root@localhost ~]# targetcli /backstores/user:glfs/block delete
No such path /backstores/user:glfs/blockX


(Obviously!!) This doesn't work with delete :-( 



Currently, We cannot call 'targetcli / saveconfig'  because it will override the unloaded configuration in saveconfig.json with current set of loaded config objects.

And if we just delete and do not have a way to remove the relevant config objects from saveconfig.json, then restart of the target.service will pick them again.



Patchs fixing the issue:
https://github.com/open-iscsi/targetcli-fb/pull/117
https://github.com/open-iscsi/rtslib-fb/pull/132

Tested with: 
 - kernel-3.10.0-915.el7
 - targetcli-2.1.fb46-6.el7
 - python-configshell-1.1.fb23-4.el7
 - python-rtslib-2.1.fb63-12.el7
The issue is no longer reproducible; No regression found.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3040