mds: update backtrace when old format inode is touchedwip-backtrace

We updated inode format version to 7 when introducing inode backtrace.
If we found a inode's format version < 7 when fetching the inode, set
the inode's backtrace_version to 0, to indicate the inode's backtrace
is out of data. When touching a inode with backtrace_version == 0, we
also update its backtrace.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index 0c500cdfe63..de0916a644b 100644
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -3206,6 +3206,11 @@ void Server::handle_client_setattr(MDRequest *mdr)
 
   // log + wait
   le->metablob.add_client_req(req->get_reqid(), req->get_oldest_client_tid());
+
+  // update backtrace for old format inode. (see inode_t::decode)
+  if (pi->backtrace_version == 0)
+    pi->update_backtrace();
+
   mdcache->predirty_journal_parents(mdr, &le->metablob, cur, 0, PREDIRTY_PRIMARY, false);
   mdcache->journal_dirty_inode(mdr, &le->metablob, cur);