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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) 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 "common/debug.h"
#include "common/errno.h"
#include "common/Cond.h"
#include "osdc/Objecter.h"
#include "mds/mdstypes.h"
#include "msg/Messenger.h"
#include "mds/JournalPointer.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_journaler
#undef dout_prefix
#define dout_prefix *_dout << objecter->messenger->get_myname() << ".journalpointer "
std::string JournalPointer::get_object_id() const
{
inodeno_t const pointer_ino = MDS_INO_LOG_POINTER_OFFSET + node_id;
char buf[32];
snprintf(buf, sizeof(buf), "%llx.%08llx", (long long unsigned)pointer_ino, (long long unsigned)0);
return std::string(buf);
}
/**
* Blocking read of JournalPointer for this MDS
*/
int JournalPointer::load(Objecter *objecter)
{
ceph_assert(objecter != NULL);
// Blocking read of data
std::string const object_id = get_object_id();
dout(4) << "Reading journal pointer '" << object_id << "'" << dendl;
bufferlist data;
C_SaferCond waiter;
objecter->read_full(object_t(object_id), object_locator_t(pool_id),
CEPH_NOSNAP, &data, 0, &waiter);
int r = waiter.wait();
// Construct JournalPointer result, null or decoded data
if (r == 0) {
auto q = data.cbegin();
try {
decode(q);
} catch (const buffer::error &e) {
return -CEPHFS_EINVAL;
}
} else {
dout(1) << "Journal pointer '" << object_id << "' read failed: " << cpp_strerror(r) << dendl;
}
return r;
}
/**
* Blocking write of JournalPointer for this MDS
*
* @return objecter write op status code
*/
int JournalPointer::save(Objecter *objecter) const
{
ceph_assert(objecter != NULL);
// It is not valid to persist a null pointer
ceph_assert(!is_null());
// Serialize JournalPointer object
bufferlist data;
encode(data);
// Write to RADOS and wait for durability
std::string const object_id = get_object_id();
dout(4) << "Writing pointer object '" << object_id << "': 0x"
<< std::hex << front << ":0x" << back << std::dec << dendl;
C_SaferCond waiter;
objecter->write_full(object_t(object_id), object_locator_t(pool_id),
SnapContext(), data,
ceph::real_clock::now(), 0,
&waiter);
int write_result = waiter.wait();
if (write_result < 0) {
derr << "Error writing pointer object '" << object_id << "': " << cpp_strerror(write_result) << dendl;
}
return write_result;
}
/**
* Non-blocking variant of save() that assumes objecter lock already held by
* caller
*/
void JournalPointer::save(Objecter *objecter, Context *completion) const
{
ceph_assert(objecter != NULL);
bufferlist data;
encode(data);
objecter->write_full(object_t(get_object_id()), object_locator_t(pool_id),
SnapContext(), data,
ceph::real_clock::now(), 0,
completion);
}
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