initial code repo

[stor4nfv.git] / src / ceph / src / tools / cephfs / Resetter.cc

diff --git a/src/ceph/src/tools/cephfs/Resetter.cc b/src/ceph/src/tools/cephfs/Resetter.cc
new file mode 100644 (file)
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--- /dev/null
+++ b/src/ceph/src/tools/cephfs/Resetter.cc
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+// -*- 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) 2010 Greg Farnum <gregf@hq.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 "common/errno.h"
+#include "osdc/Journaler.h"
+#include "mds/JournalPointer.h"
+
+#include "mds/mdstypes.h"
+#include "mds/MDCache.h"
+#include "mon/MonClient.h"
+#include "mds/events/EResetJournal.h"
+
+#include "Resetter.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_mds
+
+int Resetter::reset(mds_role_t role)
+{
+  Mutex mylock("Resetter::reset::lock");
+  Cond cond;
+  bool done;
+  int r;
+
+  auto fs =  fsmap->get_filesystem(role.fscid);
+  assert(fs != nullptr);
+  int64_t const pool_id = fs->mds_map.get_metadata_pool();
+
+  JournalPointer jp(role.rank, pool_id);
+  int jp_load_result = jp.load(objecter);
+  if (jp_load_result != 0) {
+    std::cerr << "Error loading journal: " << cpp_strerror(jp_load_result) <<
+      ", pass --force to forcibly reset this journal" << std::endl;
+    return jp_load_result;
+  }
+
+  Journaler journaler("resetter", jp.front,
+      pool_id,
+      CEPH_FS_ONDISK_MAGIC,
+      objecter, 0, 0, &finisher);
+
+  lock.Lock();
+  journaler.recover(new C_SafeCond(&mylock, &cond, &done, &r));
+  lock.Unlock();
+
+  mylock.Lock();
+  while (!done)
+    cond.Wait(mylock);
+  mylock.Unlock();
+
+  if (r != 0) {
+    if (r == -ENOENT) {
+      cerr << "journal does not exist on-disk. Did you set a bad rank?"
+          << std::endl;
+      std::cerr << "Error loading journal: " << cpp_strerror(r) <<
+        ", pass --force to forcibly reset this journal" << std::endl;
+      return r;
+    } else {
+      cerr << "got error " << r << "from Journaler, failing" << std::endl;
+      return r;
+    }
+  }
+
+  lock.Lock();
+  uint64_t old_start = journaler.get_read_pos();
+  uint64_t old_end = journaler.get_write_pos();
+  uint64_t old_len = old_end - old_start;
+  cout << "old journal was " << old_start << "~" << old_len << std::endl;
+
+  uint64_t new_start = ROUND_UP_TO(old_end+1, journaler.get_layout_period());
+  cout << "new journal start will be " << new_start
+       << " (" << (new_start - old_end) << " bytes past old end)" << std::endl;
+
+  journaler.set_read_pos(new_start);
+  journaler.set_write_pos(new_start);
+  journaler.set_expire_pos(new_start);
+  journaler.set_trimmed_pos(new_start);
+  journaler.set_writeable();
+
+  cout << "writing journal head" << std::endl;
+  journaler.write_head(new C_SafeCond(&mylock, &cond, &done, &r));
+  lock.Unlock();
+
+  mylock.Lock();
+  while (!done)
+    cond.Wait(mylock);
+  mylock.Unlock();
+
+  Mutex::Locker l(lock);
+  if (r != 0) {
+    return r;
+  }
+
+  r = _write_reset_event(&journaler);
+  if (r != 0) {
+    return r;
+  }
+
+  cout << "done" << std::endl;
+
+  return 0;
+}
+
+int Resetter::reset_hard(mds_role_t role)
+{
+  auto fs =  fsmap->get_filesystem(role.fscid);
+  assert(fs != nullptr);
+  int64_t const pool_id = fs->mds_map.get_metadata_pool();
+
+  JournalPointer jp(role.rank, pool_id);
+  jp.front = role.rank + MDS_INO_LOG_OFFSET;
+  jp.back = 0;
+  int r = jp.save(objecter);
+  if (r != 0) {
+    derr << "Error writing journal pointer: " << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  Journaler journaler("resetter", jp.front,
+    pool_id,
+    CEPH_FS_ONDISK_MAGIC,
+    objecter, 0, 0, &finisher);
+  journaler.set_writeable();
+
+  file_layout_t default_log_layout = MDCache::gen_default_log_layout(
+      fsmap->get_filesystem(role.fscid)->mds_map);
+  journaler.create(&default_log_layout, g_conf->mds_journal_format);
+
+  C_SaferCond cond;
+  {
+    Mutex::Locker l(lock);
+    journaler.write_head(&cond);
+  }
+  r = cond.wait();
+  if (r != 0) {
+    derr << "Error writing journal header: " << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  {
+    Mutex::Locker l(lock);
+    r = _write_reset_event(&journaler);
+  }
+  if (r != 0) {
+    derr << "Error writing EResetJournal: " << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  dout(4) << "Successfully wrote new journal pointer and header for rank "
+    << role << dendl;
+  return 0;
+}
+
+int Resetter::_write_reset_event(Journaler *journaler)
+{
+  assert(journaler != NULL);
+
+  LogEvent *le = new EResetJournal;
+
+  bufferlist bl;
+  le->encode_with_header(bl, CEPH_FEATURES_SUPPORTED_DEFAULT);
+  
+  cout << "writing EResetJournal entry" << std::endl;
+  C_SaferCond cond;
+  journaler->append_entry(bl);
+  journaler->flush(&cond);
+
+  return cond.wait();
+}
+