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When bringing back a downed brick and performing lookup from the client
side, the permission on said brick aren't updated on the first lookup,
but only on the second.
This patch modifies permission update logic so the first lookup will
trigger a permission update on the downed brick.
LIMITATIONS OF THE PATCH:
As the choice of source depends on whether the directory has layout or not.
Even the directories on the newly added brick will have layout xattr[zeroed], but the same is not true for a root directory.
Hence, in case in the entire cluster only the newly added bricks are up [and others are down], then any change in permission during this time will be overwritten by the older permissions when the cluster is restarted.
fixes: #999
Change-Id: Ieb70246d41e59f9cae9f70bc203627a433dfbd33
Signed-off-by: Barak Sason Rofman <bsasonro@redhat.com>
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