1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
2 // vim: ts=8 sw=2 smarttab
4 * Ceph - scalable distributed file system
6 * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
8 * This is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License version 2.1, as published by the Free Software
11 * Foundation. See file COPYING.
16 #include "common/debug.h"
17 #include "common/errno.h"
18 #include "common/Cond.h"
19 #include "osdc/Objecter.h"
20 #include "mds/mdstypes.h"
22 #include "mds/JournalPointer.h"
25 #define dout_context g_ceph_context
26 #define dout_subsys ceph_subsys_journaler
28 #define dout_prefix *_dout << objecter->messenger->get_myname() << ".journalpointer "
31 std::string JournalPointer::get_object_id() const
33 inodeno_t const pointer_ino = MDS_INO_LOG_POINTER_OFFSET + node_id;
35 snprintf(buf, sizeof(buf), "%llx.%08llx", (long long unsigned)pointer_ino, (long long unsigned)0);
37 return std::string(buf);
42 * Blocking read of JournalPointer for this MDS
44 int JournalPointer::load(Objecter *objecter)
46 assert(objecter != NULL);
48 // Blocking read of data
49 std::string const object_id = get_object_id();
50 dout(4) << "Reading journal pointer '" << object_id << "'" << dendl;
53 objecter->read_full(object_t(object_id), object_locator_t(pool_id),
54 CEPH_NOSNAP, &data, 0, &waiter);
55 int r = waiter.wait();
57 // Construct JournalPointer result, null or decoded data
59 bufferlist::iterator q = data.begin();
62 } catch (const buffer::error &e) {
66 dout(1) << "Journal pointer '" << object_id << "' read failed: " << cpp_strerror(r) << dendl;
73 * Blocking write of JournalPointer for this MDS
75 * @return objecter write op status code
77 int JournalPointer::save(Objecter *objecter) const
79 assert(objecter != NULL);
80 // It is not valid to persist a null pointer
83 // Serialize JournalPointer object
87 // Write to RADOS and wait for durability
88 std::string const object_id = get_object_id();
89 dout(4) << "Writing pointer object '" << object_id << "': 0x"
90 << std::hex << front << ":0x" << back << std::dec << dendl;
93 objecter->write_full(object_t(object_id), object_locator_t(pool_id),
95 ceph::real_clock::now(), 0,
97 int write_result = waiter.wait();
98 if (write_result < 0) {
99 derr << "Error writing pointer object '" << object_id << "': " << cpp_strerror(write_result) << dendl;
106 * Non-blocking variant of save() that assumes objecter lock already held by
109 void JournalPointer::save(Objecter *objecter, Context *completion) const
111 assert(objecter != NULL);
116 objecter->write_full(object_t(get_object_id()), object_locator_t(pool_id),
118 ceph::real_clock::now(), 0,