From f94e2ab61a30adec03ea4a2c85553fbbe2a2e5c3 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Tue, 21 Jun 2011 15:54:13 -0700
Subject: [PATCH] osd: do misdirected request checks before pg active test

We can process+discard a misdirected or invalid request without the pg
being active.  Reorder a few other checks too.

Signed-off-by: Sage Weil <sage@newdream.net>
---
 src/osd/OSD.cc | 52 ++++++++++++++++++++++++--------------------------
 1 file changed, 25 insertions(+), 27 deletions(-)

diff --git a/src/osd/OSD.cc b/src/osd/OSD.cc
index face67691fa09..e9991d68b338a 100644
--- a/src/osd/OSD.cc
+++ b/src/osd/OSD.cc
@@ -5035,28 +5035,16 @@ void OSD::handle_op(MOSDOp *op)
 
   // we don't need encoded payload anymore
   op->clear_payload();
-
  
-  // pg must be active.
-  if (pg->is_replay()) {
-    if (op->get_version().version > 0) {
-      dout(7) << *pg << " queueing replay at " << op->get_version()
-	      << " for " << *op << dendl;
-      pg->replay_queue[op->get_version()] = op;
+  if (op->may_write()) {
+    // misdirected?
+    if (!pg->is_primary() ||
+	!pg->same_for_modify_since(op->get_map_epoch())) {
+      handle_misdirected_op(pg, op);
       pg->unlock();
       return;
     }
-  }
-	
-  if (!pg->is_active()) {
-    dout(7) << *pg << " not active (yet)" << dendl;
-    pg->waiting_for_active.push_back(op);
-    pg->unlock();
-    return;
-  }
 
-  // pg must be same-ish...
-  if (op->may_write()) {
     // full?
     if (osdmap->test_flag(CEPH_OSDMAP_FULL) &&
 	!op->get_source().is_mds()) {  // FIXME: we'll exclude mds writes for now.
@@ -5065,20 +5053,14 @@ void OSD::handle_op(MOSDOp *op)
       return;
     }
 
+    // invalid?
     if (op->get_snapid() != CEPH_NOSNAP) {
       reply_op_error(op, -EINVAL);
       pg->unlock();
       return;
     }
 
-    // modify
-    if (!pg->is_primary() ||
-	!pg->same_for_modify_since(op->get_map_epoch())) {
-      handle_misdirected_op(pg, op);
-      pg->unlock();
-      return;
-    }
-    
+    // too big?
     if (g_conf.osd_max_write_size &&
         op->get_data_len() > g_conf.osd_max_write_size << 20) {
       // journal can't hold commit!
@@ -5086,9 +5068,8 @@ void OSD::handle_op(MOSDOp *op)
       pg->unlock();
       return;
     }
-
   } else {
-    // read
+    // misdirected?
     if (!pg->same_for_read_since(op->get_map_epoch())) {
       handle_misdirected_op(pg, op);
       pg->unlock();
@@ -5096,6 +5077,23 @@ void OSD::handle_op(MOSDOp *op)
     }
   }
 
+  // pg must be active.
+  if (!pg->is_active()) {
+    dout(7) << *pg << " not active (yet)" << dendl;
+    pg->waiting_for_active.push_back(op);
+    pg->unlock();
+    return;
+  }
+  if (pg->is_replay()) {
+    if (op->get_version().version > 0) {
+      dout(7) << *pg << " queueing replay at " << op->get_version()
+	      << " for " << *op << dendl;
+      pg->replay_queue[op->get_version()] = op;
+      pg->unlock();
+      return;
+    }
+  }
+
   if ((op->get_flags() & CEPH_OSD_FLAG_PGOP) == 0) {
     // missing object?
     sobject_t head(op->get_oid(), CEPH_NOSNAP);
-- 
2.39.5