initial code repo

[stor4nfv.git] / src / ceph / src / mds / MDSTable.cc

diff --git a/src/ceph/src/mds/MDSTable.cc b/src/ceph/src/mds/MDSTable.cc
new file mode 100644 (file)
index 0000000..13a007d
--- /dev/null
+++ b/src/ceph/src/mds/MDSTable.cc
@@ -0,0 +1,191 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#include "MDSTable.h"
+
+#include "MDSRank.h"
+#include "MDLog.h"
+
+#include "osdc/Filer.h"
+
+#include "include/types.h"
+
+#include "common/config.h"
+#include "common/errno.h"
+#include "common/Finisher.h"
+
+#include "include/assert.h"
+
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_mds
+#undef dout_prefix
+#define dout_prefix *_dout << "mds." << rank << "." << table_name << ": "
+
+
+class MDSTableIOContext : public MDSIOContextBase
+{
+  protected:
+    MDSTable *ida;
+    MDSRank *get_mds() override {return ida->mds;}
+  public:
+    explicit MDSTableIOContext(MDSTable *ida_) : ida(ida_) {
+      assert(ida != NULL);
+    }
+};
+
+
+class C_IO_MT_Save : public MDSTableIOContext {
+  version_t version;
+public:
+  C_IO_MT_Save(MDSTable *i, version_t v) : MDSTableIOContext(i), version(v) {}
+  void finish(int r) override {
+    ida->save_2(r, version);
+  }
+};
+
+void MDSTable::save(MDSInternalContextBase *onfinish, version_t v)
+{
+  if (v > 0 && v <= committing_version) {
+    dout(10) << "save v " << version << " - already saving "
+            << committing_version << " >= needed " << v << dendl;
+    waitfor_save[v].push_back(onfinish);
+    return;
+  }
+  
+  dout(10) << "save v " << version << dendl;
+  assert(is_active());
+  
+  bufferlist bl;
+  ::encode(version, bl);
+  encode_state(bl);
+
+  committing_version = version;
+
+  if (onfinish)
+    waitfor_save[version].push_back(onfinish);
+
+  // write (async)
+  SnapContext snapc;
+  object_t oid = get_object_name();
+  object_locator_t oloc(mds->mdsmap->get_metadata_pool());
+  mds->objecter->write_full(oid, oloc,
+                           snapc,
+                           bl, ceph::real_clock::now(), 0,
+                           new C_OnFinisher(new C_IO_MT_Save(this, version),
+                                            mds->finisher));
+}
+
+void MDSTable::save_2(int r, version_t v)
+{
+  if (r < 0) {
+    dout(1) << "save error " << r << " v " << v << dendl;
+    mds->clog->error() << "failed to store table " << table_name << " object,"
+                      << " errno " << r;
+    mds->handle_write_error(r);
+    return;
+  }
+
+  dout(10) << "save_2 v " << v << dendl;
+  committed_version = v;
+  
+  list<MDSInternalContextBase*> ls;
+  while (!waitfor_save.empty()) {
+    if (waitfor_save.begin()->first > v) break;
+    ls.splice(ls.end(), waitfor_save.begin()->second);
+    waitfor_save.erase(waitfor_save.begin());
+  }
+  finish_contexts(g_ceph_context, ls,0);
+}
+
+
+void MDSTable::reset()
+{
+  reset_state();
+  state = STATE_ACTIVE;
+}
+
+
+
+// -----------------------
+
+class C_IO_MT_Load : public MDSTableIOContext {
+public:
+  Context *onfinish;
+  bufferlist bl;
+  C_IO_MT_Load(MDSTable *i, Context *o) : MDSTableIOContext(i), onfinish(o) {}
+  void finish(int r) override {
+    ida->load_2(r, bl, onfinish);
+  }
+};
+
+object_t MDSTable::get_object_name() const
+{
+  char n[50];
+  if (per_mds)
+    snprintf(n, sizeof(n), "mds%d_%s", int(mds->get_nodeid()), table_name);
+  else
+    snprintf(n, sizeof(n), "mds_%s", table_name);
+  return object_t(n);
+}
+
+void MDSTable::load(MDSInternalContextBase *onfinish)
+{ 
+  dout(10) << "load" << dendl;
+
+  assert(is_undef());
+  state = STATE_OPENING;
+
+  C_IO_MT_Load *c = new C_IO_MT_Load(this, onfinish);
+  object_t oid = get_object_name();
+  object_locator_t oloc(mds->mdsmap->get_metadata_pool());
+  mds->objecter->read_full(oid, oloc, CEPH_NOSNAP, &c->bl, 0,
+                          new C_OnFinisher(c, mds->finisher));
+}
+
+void MDSTable::load_2(int r, bufferlist& bl, Context *onfinish)
+{
+  assert(is_opening());
+  state = STATE_ACTIVE;
+  if (r == -EBLACKLISTED) {
+    mds->respawn();
+    return;
+  }
+  if (r < 0) {
+    derr << "load_2 could not read table: " << r << dendl;
+    mds->clog->error() << "error reading table object '" << get_object_name()
+                       << "' " << r << " (" << cpp_strerror(r) << ")";
+    mds->damaged();
+    assert(r >= 0);  // Should be unreachable because damaged() calls respawn()
+  }
+
+  dout(10) << "load_2 got " << bl.length() << " bytes" << dendl;
+  bufferlist::iterator p = bl.begin();
+
+  try {
+    ::decode(version, p);
+    projected_version = committed_version = version;
+    dout(10) << "load_2 loaded v" << version << dendl;
+    decode_state(p);
+  } catch (buffer::error &e) {
+    mds->clog->error() << "error decoding table object '" << get_object_name()
+                       << "': " << e.what();
+    mds->damaged();
+    assert(r >= 0);  // Should be unreachable because damaged() calls respawn()
+  }
+
+  if (onfinish) {
+    onfinish->complete(0);
+  }
+}