Also catches corner-case found by Zheng where an unjournaled directory will
cause export pinning to fail because it cannot be made a subtree until its
parent is stable.
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
Idea here is that a pinned inode should not be exported when its parent is.
Setting the pinned inode's dirfrags to aux subtrees prevents them from being
merged with a parent subtree.
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
This allows the client/admin to pin a directory tree to a particular rank,
preventing its export by the dynamic balancer.
Fixes: http://tracker.ceph.com/issues/17834
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
