From 7aef5444b86cb72c2eddfd05b402e73fddec23b5 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Wed, 27 Apr 2011 10:00:30 -0700
Subject: [PATCH] mds: merge accounted_* stats

Signed-off-by: Sage Weil <sage@newdream.net>
---
 src/mds/CDir.cc    | 22 ++++++++++++++++++++--
 src/mds/mdstypes.h |  7 +++++++
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/src/mds/CDir.cc b/src/mds/CDir.cc
index 8493c9e2791..c718145b0f7 100644
--- a/src/mds/CDir.cc
+++ b/src/mds/CDir.cc
@@ -853,6 +853,10 @@ void CDir::merge(list<CDir*>& subs, list<Context*>& waiters, bool replay)
 {
   dout(10) << "merge " << subs << dendl;
 
+  // see if _any_ of the source frags have stale fragstat or rstat
+  int stale_rstat = 0;
+  int stale_fragstat = 0;
+
   for (list<CDir*>::iterator p = subs.begin(); p != subs.end(); p++) {
     CDir *dir = *p;
     dout(10) << " subfrag " << dir->get_frag() << " " << *dir << dendl;
@@ -875,11 +879,21 @@ void CDir::merge(list<CDir*>& subs, list<Context*>& waiters, bool replay)
     if (dir->get_version() > get_version())
       set_version(dir->get_version());
 
-    if (fnode.fragstat.version == 0)
+    // *stat versions
+    if (fnode.fragstat.version < dir->fnode.fragstat.version)
       fnode.fragstat.version = dir->fnode.fragstat.version;
-    if (fnode.rstat.version == 0)
+    if (fnode.rstat.version < dir->fnode.rstat.version)
       fnode.rstat.version = dir->fnode.rstat.version;
 
+    if (dir->fnode.accounted_fragstat.version != dir->fnode.fragstat.version)
+      stale_fragstat = 1;
+    if (dir->fnode.accounted_rstat.version != dir->fnode.rstat.version)
+      stale_rstat = 1;
+
+    // sum accounted_*
+    fnode.accounted_fragstat.add(dir->fnode.accounted_fragstat);
+    fnode.accounted_rstat.add(dir->fnode.accounted_rstat, 1);
+
     // merge state
     state_set(dir->get_state() & MASK_STATE_FRAGMENT_KEPT);
     dir_auth = dir->dir_auth;
@@ -888,6 +902,10 @@ void CDir::merge(list<CDir*>& subs, list<Context*>& waiters, bool replay)
     inode->close_dirfrag(dir->get_frag());
   }
 
+  // offset accounted_* version by -1 if any source frag was stale
+  fnode.accounted_fragstat.version = fnode.fragstat.version - stale_fragstat;
+  fnode.accounted_rstat.version = fnode.rstat.version - stale_rstat;
+
   init_fragment_pins();
 }
 
diff --git a/src/mds/mdstypes.h b/src/mds/mdstypes.h
index ffc738f4b3b..a88ceac4b16 100644
--- a/src/mds/mdstypes.h
+++ b/src/mds/mdstypes.h
@@ -140,6 +140,13 @@ struct frag_info_t : public scatter_info_t {
     nsubdirs += cur.nsubdirs - acc.nsubdirs;
   }
 
+  void add(const frag_info_t& other) {
+    if (other.mtime > mtime)
+      mtime = other.mtime;
+    nfiles += other.nfiles;
+    nsubdirs += other.nsubdirs;
+  }
+
   void encode(bufferlist &bl) const {
     __u8 v = 1;
     ::encode(v, bl);
-- 
2.47.3