[Bugs] [Bug 1285152] New: store afr pending xattrs as a volume option

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1285152

            Bug ID: 1285152
           Summary: store afr pending xattrs as a volume option
           Product: GlusterFS
           Version: mainline
         Component: replicate
          Assignee: bugs at gluster.org
          Reporter: ravishankar at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:

    Problem:
    When AFR xlator initialises, it uses the name of the client xlators
    below it for storing the pending changelogs (xattrs). This can be
    problem when some other xlator is loaded in between AFR and the client.
    Though that is a trivial 'traverse-graph-till-the-client-and-use-the-name'
    fix in AFR's init(), there are other issues like when there's no client
    xlator at all when, say, AFR is moved to the server side.

    Fix:
    The client xlator names are currenly unique and stored as
    brickinfo->brick_ids. So persist these ids as comma separated values in
    AFR's volume_options and use them as xattr values during init().

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