ceph/ceph — pull request #3108 by ukernel (2014-12-08 01:51:07+00:00)
Title: mds: store backtrace for straydir

Backport: giant, firefly, emperor, dumpling
Signed-off-by: Yan, Zheng
(cherry picked from commit 0d89db5d3e5ae5d552d4058a88a4e186748ab1d2)