hammer: osd: smaller object_info_t xattrs

src/osd/PGBackend.cc

@@ -675,7 +675,10 @@ void PGBackend::be_compare_scrubmaps(
 	update = MAYBE;
       }
       if (update != NO) {
-	utime_t age = now - auth_oi.local_mtime;
+	utime_t mtime = auth_oi.local_mtime;
+	if (mtime == utime_t())
+	  mtime = auth_oi.mtime;
+	utime_t age = now - mtime;
 	if (update == FORCE ||
 	    age > g_conf->osd_deep_scrub_update_digest_min_age) {
 	  dout(20) << __func__ << " will update digest on " << *k << dendl;

src/osd/ReplicatedPG.cc

@@ -5760,7 +5760,10 @@ void ReplicatedPG::finish_ctx(OpContext *ctx, int log_op_type, bool maintain_ssc
       ctx->snapset_obc->obs.oi.version = ctx->at_version;
       ctx->snapset_obc->obs.oi.last_reqid = ctx->reqid;
       ctx->snapset_obc->obs.oi.mtime = ctx->mtime;
-      ctx->snapset_obc->obs.oi.local_mtime = now;
+      if (pool.info.is_tier() || pool.info.has_tiers())
+	ctx->snapset_obc->obs.oi.local_mtime = now;
+      else
+	ctx->snapset_obc->obs.oi.local_mtime = utime_t();
 
       bufferlist bv(sizeof(ctx->new_obs.oi));
       ::encode(ctx->snapset_obc->obs.oi, bv);
@@ -5801,7 +5804,10 @@ void ReplicatedPG::finish_ctx(OpContext *ctx, int log_op_type, bool maintain_ssc
     if (ctx->mtime != utime_t()) {
       ctx->new_obs.oi.mtime = ctx->mtime;
       dout(10) << " set mtime to " << ctx->new_obs.oi.mtime << dendl;
-      ctx->new_obs.oi.local_mtime = now;
+      if (pool.info.is_tier() || pool.info.has_tiers())
+	ctx->new_obs.oi.local_mtime = now;
+      else
+	ctx->new_obs.oi.local_mtime = utime_t();
     } else {
       dout(10) << " mtime unchanged at " << ctx->new_obs.oi.mtime << dendl;
     }
@@ -6515,7 +6521,10 @@ void ReplicatedPG::finish_copyfrom(OpContext *ctx)
   obs.oi.user_version = ctx->user_at_version;
 
   obs.oi.set_data_digest(cb->results->data_digest);
-  obs.oi.set_omap_digest(cb->results->omap_digest);
+  if (obs.oi.is_omap())
+    obs.oi.set_omap_digest(cb->results->omap_digest);
+  else
+    obs.oi.clear_omap_digest();
 
   obs.oi.truncate_seq = cb->results->truncate_seq;
   obs.oi.truncate_size = cb->results->truncate_size;
@@ -6700,6 +6709,8 @@ void ReplicatedPG::finish_promote(int r, CopyResults *results,
       tctx->new_obs.oi.set_data_digest(results->data_digest);
     if (results->has_omap)
       tctx->new_obs.oi.set_omap_digest(results->omap_digest);
+    else
+      tctx->new_obs.oi.clear_omap_digest();
     tctx->new_obs.oi.truncate_seq = results->truncate_seq;
     tctx->new_obs.oi.truncate_size = results->truncate_size;
 
@@ -11421,7 +11432,10 @@ void ReplicatedPG::_scrub(
     ctx->at_version = get_next_version();
     ctx->mtime = utime_t();      // do not update mtime
     ctx->new_obs.oi.set_data_digest(p->second.first);
-    ctx->new_obs.oi.set_omap_digest(p->second.second);
+    if (ctx->new_obs.oi.is_omap())
+      ctx->new_obs.oi.set_omap_digest(p->second.second);
+    else
+      ctx->new_obs.oi.clear_omap_digest();
     finish_ctx(ctx, pg_log_entry_t::MODIFY, true, true);
     ctx->on_finish = new C_ScrubDigestUpdated(this);
     simple_repop_submit(repop);

src/osd/osd_types.cc

@@ -4225,7 +4225,16 @@ void object_info_t::encode(bufferlist& bl) const
        ++i) {
     old_watchers.insert(make_pair(i->first.second, i->second));
   }
-  ENCODE_START(15, 8, bl);
+
+  // kludge to reduce xattr size for most rbd objects
+  int ev = 15;
+  if (!(flags & FLAG_OMAP_DIGEST) &&
+      !(flags & FLAG_DATA_DIGEST) &&
+      local_mtime == utime_t()) {
+    ev = 13;
+  }
+
+  ENCODE_START(ev, 8, bl);
   ::encode(soid, bl);
   ::encode(myoloc, bl);	//Retained for compatibility
   ::encode((__u32)0, bl); // was category, no longer used
@@ -4250,9 +4259,13 @@ void object_info_t::encode(bufferlist& bl) const
   ::encode(watchers, bl);
   __u32 _flags = flags;
   ::encode(_flags, bl);
-  ::encode(local_mtime, bl);
-  ::encode(data_digest, bl);
-  ::encode(omap_digest, bl);
+  if (ev >= 14) {
+    ::encode(local_mtime, bl);
+  }
+  if (ev >= 15) {
+    ::encode(data_digest, bl);
+    ::encode(omap_digest, bl);
+  }
   ENCODE_FINISH(bl);
 }
 

src/osd/osd_types.h

@@ -2959,7 +2959,7 @@ struct object_info_t {
   }
   void new_object() {
     set_data_digest(-1);
-    set_omap_digest(-1);
+    clear_omap_digest();
   }
 
   void encode(bufferlist& bl) const;