ceph/ceph — pull request #1219 by ukernel (2014-02-12 06:26:52+00:00)
Title: mds: force update backtraces for previously created FS

Update inode format version to 10, treat any previously created
inode as no backtrace. When inode with no backtrace is modified,
force update its backtrace.

Signed-off-by: Yan, Zheng