X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fkv%2FMemDB.cc;fp=src%2Fceph%2Fsrc%2Fkv%2FMemDB.cc;h=0000000000000000000000000000000000000000;hb=7da45d65be36d36b880cc55c5036e96c24b53f00;hp=d6af78b182706e1a5ad191d9750b2373c0817f09;hpb=691462d09d0987b47e112d6ee8740375df3c51b2;p=stor4nfv.git

diff --git a/src/ceph/src/kv/MemDB.cc b/src/ceph/src/kv/MemDB.cc
deleted file mode 100644
index d6af78b..0000000
--- a/src/ceph/src/kv/MemDB.cc
+++ /dev/null
@@ -1,595 +0,0 @@
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-/*
- * In-memory crash non-safe keyvalue db
- * Author: Ramesh Chander, Ramesh.Chander@sandisk.com
- */
-
-#include "include/compat.h"
-#include <set>
-#include <map>
-#include <string>
-#include <memory>
-#include <errno.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#include "common/perf_counters.h"
-#include "common/debug.h"
-#include "include/str_list.h"
-#include "include/str_map.h"
-#include "KeyValueDB.h"
-#include "MemDB.h"
-
-#include "include/assert.h"
-#include "common/debug.h"
-#include "common/errno.h"
-#include "include/compat.h"
-
-#define dout_context g_ceph_context
-#define dout_subsys ceph_subsys_memdb
-#undef dout_prefix
-#define dout_prefix *_dout << "memdb: "
-#define dtrace dout(30)
-#define dwarn dout(0)
-#define dinfo dout(0)
-
-static void split_key(const string& raw_key, string *prefix, string *key)
-{
-  size_t pos = raw_key.find(KEY_DELIM, 0);
-  assert(pos != std::string::npos);
-  *prefix = raw_key.substr(0, pos);
-  *key = raw_key.substr(pos + 1, raw_key.length());
-}
-
-static string make_key(const string &prefix, const string &value)
-{
-  string out = prefix;
-  out.push_back(KEY_DELIM);
-  out.append(value);
-  return out;
-}
-
-void MemDB::_encode(mdb_iter_t iter, bufferlist &bl)
-{
-  ::encode(iter->first, bl);
-  ::encode(iter->second, bl);
-}
-
-std::string MemDB::_get_data_fn()
-{
-  string fn = m_db_path + "/" + "MemDB.db";
-  return fn;
-}
-
-void MemDB::_save()
-{
-  std::lock_guard<std::mutex> l(m_lock);
-  dout(10) << __func__ << " Saving MemDB to file: "<< _get_data_fn().c_str() << dendl;
-  int mode = 0644;
-  int fd = TEMP_FAILURE_RETRY(::open(_get_data_fn().c_str(),
-                                     O_WRONLY|O_CREAT|O_TRUNC, mode));
-  if (fd < 0) {
-    int err = errno;
-    cerr << "write_file(" << _get_data_fn().c_str() << "): failed to open file: "
-         << cpp_strerror(err) << std::endl;
-    return;
-  }
-  bufferlist bl;
-  mdb_iter_t iter = m_map.begin();
-  while (iter != m_map.end()) {
-    dout(10) << __func__ << " Key:"<< iter->first << dendl;
-    _encode(iter, bl);
-    ++iter;
-  }
-  bl.write_fd(fd);
-
-  VOID_TEMP_FAILURE_RETRY(::close(fd));
-}
-
-int MemDB::_load()
-{
-  std::lock_guard<std::mutex> l(m_lock);
-  dout(10) << __func__ << " Reading MemDB from file: "<< _get_data_fn().c_str() << dendl;
-  /*
-   * Open file and read it in single shot.
-   */
-  int fd = TEMP_FAILURE_RETRY(::open(_get_data_fn().c_str(), O_RDONLY));
-  if (fd < 0) {
-    int err = errno;
-    cerr << "can't open " << _get_data_fn().c_str() << ": "
-         << cpp_strerror(err) << std::endl;
-    return -err;
-  }
-
-  struct stat st;
-  memset(&st, 0, sizeof(st));
-  if (::fstat(fd, &st) < 0) {
-    int err = errno;
-    cerr << "can't stat file " << _get_data_fn().c_str() << ": "
-         << cpp_strerror(err) << std::endl;
-    VOID_TEMP_FAILURE_RETRY(::close(fd));
-    return -err;
-  }
-
-  ssize_t file_size = st.st_size;
-  ssize_t bytes_done = 0;
-  while (bytes_done < file_size) {
-    string key;
-    bufferptr datap;
-
-    bytes_done += ::decode_file(fd, key);
-    bytes_done += ::decode_file(fd, datap);
-
-    dout(10) << __func__ << " Key:"<< key << dendl;
-    m_map[key] = datap;
-    m_total_bytes += datap.length();
-  }
-  VOID_TEMP_FAILURE_RETRY(::close(fd));
-  return 0;
-}
-
-int MemDB::_init(bool create)
-{
-  int r;
-  dout(1) << __func__ << dendl;
-  if (create) {
-    r = ::mkdir(m_db_path.c_str(), 0700);
-    if (r < 0) {
-      r = -errno;
-      if (r != -EEXIST) {
-        derr << __func__ << " mkdir failed: " << cpp_strerror(r) << dendl;
-        return r;
-      }
-      return 0; // ignore EEXIST
-    }
-  } else {
-    r = _load();
-  }
-
-  return r;
-}
-
-int MemDB::set_merge_operator(
-  const string& prefix,
-  std::shared_ptr<KeyValueDB::MergeOperator> mop)
-{
-  merge_ops.push_back(std::make_pair(prefix, mop));
-  return 0;
-}
-
-int MemDB::do_open(ostream &out, bool create)
-{
-  m_total_bytes = 0;
-  m_allocated_bytes = 1;
-
-  return _init(create);
-}
-
-MemDB::~MemDB()
-{
-  close();
-  dout(10) << __func__ << " Destroying MemDB instance: "<< dendl;
-}
-
-void MemDB::close()
-{
-  /*
-   * Save whatever in memory btree.
-   */
-  _save();
-}
-
-int MemDB::submit_transaction(KeyValueDB::Transaction t)
-{
-  MDBTransactionImpl* mt =  static_cast<MDBTransactionImpl*>(t.get());
-
-  dtrace << __func__ << " " << mt->get_ops().size() << dendl;
-  for(auto& op : mt->get_ops()) {
-    if(op.first == MDBTransactionImpl::WRITE) {
-      ms_op_t set_op = op.second;
-      _setkey(set_op);
-    } else if (op.first == MDBTransactionImpl::MERGE) {
-      ms_op_t merge_op = op.second;
-      _merge(merge_op);
-    } else {
-      ms_op_t rm_op = op.second;
-      assert(op.first == MDBTransactionImpl::DELETE);
-      _rmkey(rm_op);
-    }
-  }
-
-  return 0;
-}
-
-int MemDB::submit_transaction_sync(KeyValueDB::Transaction tsync)
-{
-  dtrace << __func__ << " " << dendl;
-  submit_transaction(tsync);
-  return 0;
-}
-
-int MemDB::transaction_rollback(KeyValueDB::Transaction t)
-{
-  MDBTransactionImpl* mt =  static_cast<MDBTransactionImpl*>(t.get());
-  mt->clear();
-  return 0;
-}
-
-void MemDB::MDBTransactionImpl::set(
-  const string &prefix, const string &k, const bufferlist &to_set_bl)
-{
-  dtrace << __func__ << " " << prefix << " " << k << dendl;
-  ops.push_back(make_pair(WRITE, std::make_pair(std::make_pair(prefix, k),
-                  to_set_bl)));
-}
-
-void MemDB::MDBTransactionImpl::rmkey(const string &prefix,
-    const string &k)
-{
-  dtrace << __func__ << " " << prefix << " " << k << dendl;
-  ops.push_back(make_pair(DELETE,
-                          std::make_pair(std::make_pair(prefix, k),
-                          bufferlist())));
-}
-
-void MemDB::MDBTransactionImpl::rmkeys_by_prefix(const string &prefix)
-{
-  KeyValueDB::Iterator it = m_db->get_iterator(prefix);
-  for (it->seek_to_first(); it->valid(); it->next()) {
-    rmkey(prefix, it->key());
-  }
-}
-
-void MemDB::MDBTransactionImpl::rm_range_keys(const string &prefix, const string &start, const string &end)
-{
-  KeyValueDB::Iterator it = m_db->get_iterator(prefix);
-  it->lower_bound(start);
-  while (it->valid()) {
-    if (it->key() >= end) {
-      break;
-    }
-    rmkey(prefix, it->key());
-    it->next();
-  }
-}
-
-void MemDB::MDBTransactionImpl::merge(
-  const std::string &prefix, const std::string &key, const bufferlist  &value)
-{
-
-  dtrace << __func__ << " " << prefix << " " << key << dendl;
-  ops.push_back(make_pair(MERGE, make_pair(std::make_pair(prefix, key), value)));
-  return;
-}
-
-int MemDB::_setkey(ms_op_t &op)
-{
-  std::lock_guard<std::mutex> l(m_lock);
-  std::string key = make_key(op.first.first, op.first.second);
-  bufferlist bl = op.second;
-
-  m_total_bytes += bl.length();
-
-  bufferlist bl_old;
-  if (_get(op.first.first, op.first.second, &bl_old)) {
-    /*
-     * delete and free existing key.
-     */
-    assert(m_total_bytes >= bl_old.length());
-    m_total_bytes -= bl_old.length();
-    m_map.erase(key);
-  }
-
-  m_map[key] = bufferptr((char *) bl.c_str(), bl.length());
-  iterator_seq_no++;
-  return 0;
-}
-
-int MemDB::_rmkey(ms_op_t &op)
-{
-  std::lock_guard<std::mutex> l(m_lock);
-  std::string key = make_key(op.first.first, op.first.second);
-
-  bufferlist bl_old;
-  if (_get(op.first.first, op.first.second, &bl_old)) {
-    assert(m_total_bytes >= bl_old.length());
-    m_total_bytes -= bl_old.length();
-  }
-  iterator_seq_no++;
-  /*
-   * Erase will call the destructor for bufferptr.
-   */
-  return m_map.erase(key);
-}
-
-std::shared_ptr<KeyValueDB::MergeOperator> MemDB::_find_merge_op(std::string prefix)
-{
-  for (const auto& i : merge_ops) {
-    if (i.first == prefix) {
-      return i.second;
-    }
-  }
-
-  dtrace << __func__ << " No merge op for " << prefix << dendl;
-  return NULL;
-}
-
-
-int MemDB::_merge(ms_op_t &op)
-{
-  std::lock_guard<std::mutex> l(m_lock);
-  std::string prefix = op.first.first;
-  std::string key = make_key(op.first.first, op.first.second);
-  bufferlist bl = op.second;
-  int64_t bytes_adjusted = bl.length();
-
-  /*
-   *  find the operator for this prefix
-   */
-  std::shared_ptr<MergeOperator> mop = _find_merge_op(prefix);
-  assert(mop);
-
-  /*
-   * call the merge operator with value and non value
-   */
-  bufferlist bl_old;
-  if (_get(op.first.first, op.first.second, &bl_old) == false) {
-    std::string new_val;
-    /*
-     * Merge non existent.
-     */
-    mop->merge_nonexistent(bl.c_str(), bl.length(), &new_val);
-    m_map[key] = bufferptr(new_val.c_str(), new_val.length());
-  } else {
-    /*
-     * Merge existing.
-     */
-    std::string new_val;
-    mop->merge(bl_old.c_str(), bl_old.length(), bl.c_str(), bl.length(), &new_val);
-    m_map[key] = bufferptr(new_val.c_str(), new_val.length());
-    bytes_adjusted -= bl_old.length();
-    bl_old.clear();
-  }
-
-  assert((int64_t)m_total_bytes + bytes_adjusted >= 0);
-  m_total_bytes += bytes_adjusted;
-  iterator_seq_no++;
-  return 0;
-}
-
-/*
- * Caller take btree lock.
- */
-bool MemDB::_get(const string &prefix, const string &k, bufferlist *out)
-{
-  string key = make_key(prefix, k);
-
-  mdb_iter_t iter = m_map.find(key);
-  if (iter == m_map.end()) {
-    return false;
-  }
-
-  out->push_back((m_map[key].clone()));
-  return true;
-}
-
-bool MemDB::_get_locked(const string &prefix, const string &k, bufferlist *out)
-{
-  std::lock_guard<std::mutex> l(m_lock);
-  return _get(prefix, k, out);
-}
-
-
-int MemDB::get(const string &prefix, const std::string& key,
-                 bufferlist *out)
-{
-  if (_get_locked(prefix, key, out)) {
-    return 0;
-  }
-  return -ENOENT;
-}
-
-int MemDB::get(const string &prefix, const std::set<string> &keys,
-    std::map<string, bufferlist> *out)
-{
-  for (const auto& i : keys) {
-    bufferlist bl;
-    if (_get_locked(prefix, i, &bl))
-      out->insert(make_pair(i, bl));
-  }
-
-  return 0;
-}
-
-void MemDB::MDBWholeSpaceIteratorImpl::fill_current()
-{
-  bufferlist bl;
-  bl.append(m_iter->second.clone());
-  m_key_value = std::make_pair(m_iter->first, bl);
-}
-
-bool MemDB::MDBWholeSpaceIteratorImpl::valid()
-{
-  if (m_key_value.first.empty()) {
-    return false;
-  }
-  return true;
-}
-
-bool MemDB::MDBWholeSpaceIteratorImpl::iterator_validate() {
-
-  if (this_seq_no != *global_seq_no) {
-    auto key = m_key_value.first;
-    assert(!key.empty());
-
-    bool restart_iter = false;
-    if (!m_using_btree) {
-      /*
-       * Map is modified and marker key does not exists, 
-       * restart the iterator from next key.
-       */
-      if (m_map_p->find(key) == m_map_p->end()) {
-        restart_iter = true;
-      }
-    } else {
-      restart_iter = true;
-    }
-
-    if (restart_iter) {
-      m_iter = m_map_p->lower_bound(key);
-      if (m_iter == m_map_p->end()) {
-        return false;
-      }
-    }
-
-    /*
-     * This iter is valid now.
-     */
-    this_seq_no = *global_seq_no;
-  }
-
-  return true;
-}
-
-void
-MemDB::MDBWholeSpaceIteratorImpl::free_last()
-{
-  m_key_value.first.clear();
-  m_key_value.second.clear();
-}
-
-string MemDB::MDBWholeSpaceIteratorImpl::key()
-{
-  dtrace << __func__ << " " << m_key_value.first << dendl;
-  string prefix, key;
-  split_key(m_key_value.first, &prefix, &key);
-  return key;
-}
-
-pair<string,string> MemDB::MDBWholeSpaceIteratorImpl::raw_key()
-{
-  string prefix, key;
-  split_key(m_key_value.first, &prefix, &key);
-  return make_pair(prefix, key);
-}
-
-bool MemDB::MDBWholeSpaceIteratorImpl::raw_key_is_prefixed(
-    const string &prefix)
-{
-  string p, k;
-  split_key(m_key_value.first, &p, &k);
-  return (p == prefix);
-}
-
-bufferlist MemDB::MDBWholeSpaceIteratorImpl::value()
-{
-  dtrace << __func__ << " " << m_key_value << dendl;
-  return m_key_value.second;
-}
-
-int MemDB::MDBWholeSpaceIteratorImpl::next()
-{
-  std::lock_guard<std::mutex> l(*m_map_lock_p);
-  if (!iterator_validate()) {
-    free_last();
-    return -1;
-  }
-  free_last();
-  ++m_iter;
-  if (m_iter != m_map_p->end()) {
-    fill_current();
-    return 0;
-  } else {
-    return -1;
-  }
-}
-
-int MemDB::MDBWholeSpaceIteratorImpl:: prev()
-{
-  std::lock_guard<std::mutex> l(*m_map_lock_p);
-  if (!iterator_validate()) {
-    free_last();
-    return -1;
-  }
-  free_last();
-  if (m_iter != m_map_p->begin()) {
-    --m_iter;
-    fill_current();
-    return 0;
-  } else {
-    return -1;
-  }
-}
-
-/*
- * First key >= to given key, if key is null then first key in btree.
- */
-int MemDB::MDBWholeSpaceIteratorImpl::seek_to_first(const std::string &k)
-{
-  std::lock_guard<std::mutex> l(*m_map_lock_p);
-  free_last();
-  if (k.empty()) {
-    m_iter = m_map_p->begin();
-  } else {
-    m_iter = m_map_p->lower_bound(k);
-  }
-  
-  if (m_iter == m_map_p->end()) {
-    return -1;
-  }
-  fill_current();
-  return 0;
-}
-
-int MemDB::MDBWholeSpaceIteratorImpl::seek_to_last(const std::string &k)
-{
-  std::lock_guard<std::mutex> l(*m_map_lock_p);
-  free_last();
-  if (k.empty()) {
-    m_iter = m_map_p->end();
-    --m_iter;
-  } else {
-    m_iter = m_map_p->lower_bound(k);
-  }
-
-  if (m_iter == m_map_p->end()) {
-    return -1;
-  }
-  fill_current();
-  return 0;
-}
-
-MemDB::MDBWholeSpaceIteratorImpl::~MDBWholeSpaceIteratorImpl()
-{
-  free_last();
-}
-
-int MemDB::MDBWholeSpaceIteratorImpl::upper_bound(const std::string &prefix,
-    const std::string &after) {
-
-  std::lock_guard<std::mutex> l(*m_map_lock_p);
-
-  dtrace << "upper_bound " << prefix.c_str() << after.c_str() << dendl;
-  string k = make_key(prefix, after);
-  m_iter = m_map_p->upper_bound(k);
-  if (m_iter != m_map_p->end()) {
-    fill_current();
-    return 0;
-  }
-  return -1;
-}
-
-int MemDB::MDBWholeSpaceIteratorImpl::lower_bound(const std::string &prefix,
-    const std::string &to) {
-  std::lock_guard<std::mutex> l(*m_map_lock_p);
-  dtrace << "lower_bound " << prefix.c_str() << to.c_str() << dendl;
-  string k = make_key(prefix, to);
-  m_iter = m_map_p->lower_bound(k);
-  if (m_iter != m_map_p->end()) {
-    fill_current();
-    return 0;
-  }
-  return -1;
-}