ceph: handle frag mismatch between readdir request and reply
If client has outdated directory fragments information, it may request readdir an non-existent directory fragment. In this case, the MDS finds an approximate directory fragment and sends its contents back to the client. When receiving a reply with fragment that is different than the requested one, the client need to reset the 'readdir offset'. Signed-off-by: NYan, Zheng <zheng.z.yan@intel.com> Reviewed-by: NSage Weil <sage@inktank.com>
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