/*
 * Copyright 2012, Jérôme Duval, korli@users.berlios.de.
 * Copyright 2003 Tyler Dauwalder, tyler@dauwalder.net
 * This file may be used under the terms of the MIT License.
 */


#include "MetadataPartition.h"

#include "Icb.h"


/*! \brief Creates a new MetadataPartition object.
*/
MetadataPartition::MetadataPartition(Volume *volume,
        uint16 parentNumber, Partition &parentPartition, uint32 metadataFileLocation,
        uint32 metadataMirrorFileLocation, uint32 metadataBitmapFileLocation,
        uint32 allocationUnitSize, uint16 alignmentUnitSize,
        bool metadataIsDuplicated)
        : fPartition(parentNumber),
        fParentPartition(parentPartition),
        fAllocationUnitSize(allocationUnitSize),
        fAlignmentUnitSize(alignmentUnitSize),
        fMetadataIsDuplicated(metadataIsDuplicated),
        fInitStatus(B_NO_INIT),
        fMetadataIcb(NULL)
{
        long_address address;
        address.set_to(metadataFileLocation, fPartition);
        
        fMetadataIcb = new(nothrow) Icb(volume, address);
        if (fMetadataIcb == NULL || fMetadataIcb->InitCheck() != B_OK)
                fInitStatus = B_NO_MEMORY;
        else
                fInitStatus = B_OK;

        address.set_to(metadataMirrorFileLocation, fPartition);
        
        fMetadataMirrorIcb = new(nothrow) Icb(volume, address);
        if (fMetadataMirrorIcb == NULL
                || fMetadataMirrorIcb->InitCheck() != B_OK) {
                fInitStatus = B_NO_MEMORY;
        }
}

/*! \brief Destroys the MetadataPartition object.
*/
MetadataPartition::~MetadataPartition()
{
        delete fMetadataIcb;
        delete fMetadataMirrorIcb;
}

/*! \brief Maps the given logical block to a physical block on disc.
*/
status_t
MetadataPartition::MapBlock(uint32 logicalBlock, off_t &physicalBlock)
{
        off_t block = 0;
        bool isRecorded;
        status_t status = fMetadataIcb->FindBlock(logicalBlock, block, isRecorded);
        if (status != B_OK)
                return status;
        if (!isRecorded) {
                status = fMetadataMirrorIcb->FindBlock(logicalBlock, block, isRecorded);
                if (status != B_OK)
                        return status;
                if (!isRecorded)
                        return B_BAD_DATA;
        }
        return fParentPartition.MapBlock(block, physicalBlock);
}

/*! Returns the initialization status of the object.
*/
status_t
MetadataPartition::InitCheck()
{
        return fInitStatus;
}