[Bugs] [Bug 1428081] New: cluster/dht: Bug fixes to cluster.min-free-disk

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1428081

            Bug ID: 1428081
           Summary: cluster/dht: Bug fixes to cluster.min-free-disk
           Product: GlusterFS
           Version: mainline
         Component: core
          Assignee: bugs at gluster.org
          Reporter: vbellur at redhat.com
                CC: bugs at gluster.org



cluster/dht: Bug fixes to cluster.min-free-disk

Summary:
- Enforces FUSE/gNFSd/SHD/rebalance rejection of writes when all subvolumes are
  beyond the value set in "cluster.min-free-disk"
- Fixes existing code paths to be more intuitive & straightforward
- Write path now honors min-free-disk
- Adds test to ensure feature doesn't break in future
- This is a port of D2981282 to 3.8

Signed-off-by: Shreyas Siravara <sshreyas at fb.com>

Change-Id: I76923bf76178fe589aa1a26bd1970cf8d009642a
Reviewed-on: http://review.gluster.org/16153
NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
Smoke: Gluster Build System <jenkins at build.gluster.org>
Reviewed-by: Shreyas Siravara <sshreyas at fb.com>
Tested-by: Shreyas Siravara <sshreyas at fb.com>
CentOS-regression: Gluster Build System <jenkins at build.gluster.org>

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