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// --------------------------------------------------------------------------
//
// File
// Name: BackupClientInodeToIDMap.cpp
// Purpose: Map of inode numbers to file IDs on the store
// Created: 11/11/03
//
// --------------------------------------------------------------------------
#include "Box.h"
#include <stdlib.h>
#include <depot.h>
#define BACKIPCLIENTINODETOIDMAP_IMPLEMENTATION
#include "BackupClientInodeToIDMap.h"
#undef BACKIPCLIENTINODETOIDMAP_IMPLEMENTATION
#include "BackupStoreException.h"
#include "MemLeakFindOn.h"
typedef struct
{
int64_t mObjectID;
int64_t mInDirectory;
} IDBRecord;
#define BOX_DBM_MESSAGE(stuff) stuff << " (qdbm): " << dperrmsg(dpecode)
#define BOX_LOG_DBM_ERROR(stuff) \
BOX_ERROR(BOX_DBM_MESSAGE(stuff))
#define THROW_DBM_ERROR(message, filename, exception, subtype) \
BOX_LOG_DBM_ERROR(message << ": " << filename); \
THROW_EXCEPTION_MESSAGE(exception, subtype, \
BOX_DBM_MESSAGE(message << ": " << filename));
#define ASSERT_DBM_OK(operation, message, filename, exception, subtype) \
if(!(operation)) \
{ \
THROW_DBM_ERROR(message, filename, exception, subtype); \
}
#define ASSERT_DBM_OPEN() \
if(mpDepot == 0) \
{ \
THROW_EXCEPTION_MESSAGE(BackupStoreException, InodeMapNotOpen, \
"Inode database not open"); \
}
#define ASSERT_DBM_CLOSED() \
if(mpDepot != 0) \
{ \
THROW_EXCEPTION_MESSAGE(CommonException, Internal, \
"Inode database already open: " << mFilename); \
}
// --------------------------------------------------------------------------
//
// Function
// Name: BackupClientInodeToIDMap::BackupClientInodeToIDMap()
// Purpose: Constructor
// Created: 11/11/03
//
// --------------------------------------------------------------------------
BackupClientInodeToIDMap::BackupClientInodeToIDMap()
: mReadOnly(true),
mEmpty(false),
mpDepot(0)
{
}
// --------------------------------------------------------------------------
//
// Function
// Name: BackupClientInodeToIDMap::~BackupClientInodeToIDMap()
// Purpose: Destructor
// Created: 11/11/03
//
// --------------------------------------------------------------------------
BackupClientInodeToIDMap::~BackupClientInodeToIDMap()
{
if(mpDepot != 0)
{
Close();
}
}
// --------------------------------------------------------------------------
//
// Function
// Name: BackupClientInodeToIDMap::Open(const char *, bool, bool)
// Purpose: Open the database map, creating a file on disc to store everything
// Created: 20/11/03
//
// --------------------------------------------------------------------------
void BackupClientInodeToIDMap::Open(const char *Filename, bool ReadOnly,
bool CreateNew)
{
mFilename = Filename;
// Correct arguments?
ASSERT(!(CreateNew && ReadOnly));
// Correct usage?
ASSERT_DBM_CLOSED();
ASSERT(!mEmpty);
// Open the database file
int mode = ReadOnly ? DP_OREADER : DP_OWRITER;
if(CreateNew)
{
mode |= DP_OCREAT;
}
mpDepot = dpopen(Filename, mode, 0);
ASSERT_DBM_OK(mpDepot, "Failed to open inode database", mFilename,
BackupStoreException, BerkelyDBFailure);
// Read only flag
mReadOnly = ReadOnly;
}
// --------------------------------------------------------------------------
//
// Function
// Name: BackupClientInodeToIDMap::OpenEmpty()
// Purpose: 'Open' this map. Not associated with a disc file.
// Useful for when a map is required, but is against
// an empty file on disc which shouldn't be created.
// Implies read only.
// Created: 20/11/03
//
// --------------------------------------------------------------------------
void BackupClientInodeToIDMap::OpenEmpty()
{
ASSERT_DBM_CLOSED();
ASSERT(mpDepot == 0);
mEmpty = true;
mReadOnly = true;
}
// --------------------------------------------------------------------------
//
// Function
// Name: BackupClientInodeToIDMap::Close()
// Purpose: Close the database file
// Created: 20/11/03
//
// --------------------------------------------------------------------------
void BackupClientInodeToIDMap::Close()
{
ASSERT_DBM_OPEN();
ASSERT_DBM_OK(dpclose(mpDepot), "Failed to close inode database",
mFilename, BackupStoreException, BerkelyDBFailure);
mpDepot = 0;
}
// --------------------------------------------------------------------------
//
// Function
// Name: BackupClientInodeToIDMap::AddToMap(InodeRefType,
// int64_t, int64_t)
// Purpose: Adds an entry to the map. Overwrites any existing
// entry.
// Created: 11/11/03
//
// --------------------------------------------------------------------------
void BackupClientInodeToIDMap::AddToMap(InodeRefType InodeRef, int64_t ObjectID,
int64_t InDirectory)
{
if(mReadOnly)
{
THROW_EXCEPTION(BackupStoreException, InodeMapIsReadOnly);
}
if(mpDepot == 0)
{
THROW_EXCEPTION(BackupStoreException, InodeMapNotOpen);
}
ASSERT_DBM_OPEN();
// Setup structures
IDBRecord rec;
rec.mObjectID = ObjectID;
rec.mInDirectory = InDirectory;
ASSERT_DBM_OK(dpput(mpDepot, (const char *)&InodeRef, sizeof(InodeRef),
(const char *)&rec, sizeof(rec), DP_DOVER),
"Failed to add record to inode database", mFilename,
BackupStoreException, BerkelyDBFailure);
}
// --------------------------------------------------------------------------
//
// Function
// Name: BackupClientInodeToIDMap::Lookup(InodeRefType,
// int64_t &, int64_t &) const
// Purpose: Looks up an inode in the map, returning true if it
// exists, and the object ids of it and the directory
// it's in the reference arguments.
// Created: 11/11/03
//
// --------------------------------------------------------------------------
bool BackupClientInodeToIDMap::Lookup(InodeRefType InodeRef,
int64_t &rObjectIDOut, int64_t &rInDirectoryOut) const
{
if(mEmpty)
{
// Map is empty
return false;
}
if(mpDepot == 0)
{
THROW_EXCEPTION(BackupStoreException, InodeMapNotOpen);
}
ASSERT_DBM_OPEN();
IDBRecord rec;
if(dpgetwb(mpDepot, (const char *)&InodeRef, sizeof(InodeRef),
0, sizeof(IDBRecord), (char *)&rec) == -1)
{
// key not in file
return false;
}
// Return data
rObjectIDOut = rec.mObjectID;
rInDirectoryOut = rec.mInDirectory;
// Found
return true;
}
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