The dirfragtree is lazily updated, it's not always accurate. Infinite
loops happens in following circumstance.
- client send request to read frag A
- frag A has been fragmented into frag B and C. So mds fills the reply
with contents of frag B
- client wants to read next frag C. ceph_choose_frag(frag value of C)
return frag A.
The fix is using previous readdir reply to calculate next readdir frag
when possible.
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
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