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Description of problem:

saveconfig: dump control string max_data_area_mb

Problem:
-------
$ targetcli /backstores/user:glfs create blockX1 1073741824 test.124.227/block-store/e59309bb-d591-4121-a891-e98ff3416446,max_data_area_mb=32

$ targetcli / saveconfig

$ cat /etc/target/saveconfig.json
{
  "storage_objects": [
    {
      "alua_tpgs": [],
      "attributes": {
        ...
      },
      "config": "glfs/test.124.227/block-store/e59309bb-d591-4121-a891-e98ff3416446",
      "hw_max_sectors": 128,
      "name": "blockX1",
      "plugin": "user",
      "size": 1073741824,
      "wwn": "3aa072d6-a007-45a3-8eac-e85b53655515"
    }
  ],
  "targets": []
}

Note max_data_area_mb is not dumped into the configfile and hence on restart oftarget service or node reboot this storageObject property is lost.

Fix:
---
make sure to append max_data_area_mb to config param, like:
$ cat /etc/target/saveconfig.json
{
  ...
  "config": "glfs/test.124.227/block-store/e59309bb-d591-4121-a891-e98ff3416446,max_data_area_mb=32",
  ...
}

So that on restore and reboot we don't lose the property.

Patch posted Upstream:
https://github.com/open-iscsi/rtslib-fb/pull/128

(In reply to Prasanna Kumar Kalever from comment #2)
> Patch posted Upstream:
> https://github.com/open-iscsi/rtslib-fb/pull/128

In addition to above PR we also need:
https://github.com/open-iscsi/targetcli-fb/pull/109

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/RHEA-2018:3019