src/add-ons/kernel/file_systems/udf/MetadataPartition.cpp

   1 /*
   2  * Copyright 2012, Jérôme Duval, korli@users.berlios.de.
   3  * Copyright 2003 Tyler Dauwalder, tyler@dauwalder.net
   4  * This file may be used under the terms of the MIT License.
   5  */
   6
   7
   8 #include "MetadataPartition.h"
   9
  10 #include "Icb.h"
  11
  12
  13 /*! \brief Creates a new MetadataPartition object.
  14 */
  15 MetadataPartition::MetadataPartition(Volume *volume,
  16         uint16 parentNumber, Partition &parentPartition, uint32 metadataFileLocation,
  17         uint32 metadataMirrorFileLocation, uint32 metadataBitmapFileLocation,
  18         uint32 allocationUnitSize, uint16 alignmentUnitSize,
  19         bool metadataIsDuplicated)
  20         : fPartition(parentNumber),
  21         fParentPartition(parentPartition),
  22         fAllocationUnitSize(allocationUnitSize),
  23         fAlignmentUnitSize(alignmentUnitSize),
  24         fMetadataIsDuplicated(metadataIsDuplicated),
  25         fInitStatus(B_NO_INIT),
  26         fMetadataIcb(NULL)
  27 {
  28         long_address address;
  29         address.set_to(metadataFileLocation, fPartition);
  30
  31         fMetadataIcb = new(nothrow) Icb(volume, address);
  32         if (fMetadataIcb == NULL || fMetadataIcb->InitCheck() != B_OK)
  33                 fInitStatus = B_NO_MEMORY;
  34         else
  35                 fInitStatus = B_OK;
  36
  37         address.set_to(metadataMirrorFileLocation, fPartition);
  38
  39         fMetadataMirrorIcb = new(nothrow) Icb(volume, address);
  40         if (fMetadataMirrorIcb == NULL
  41                 || fMetadataMirrorIcb->InitCheck() != B_OK) {
  42                 fInitStatus = B_NO_MEMORY;
  43         }
  44 }
  45
  46 /*! \brief Destroys the MetadataPartition object.
  47 */
  48 MetadataPartition::~MetadataPartition()
  49 {
  50         delete fMetadataIcb;
  51         delete fMetadataMirrorIcb;
  52 }
  53
  54 /*! \brief Maps the given logical block to a physical block on disc.
  55 */
  56 status_t
  57 MetadataPartition::MapBlock(uint32 logicalBlock, off_t &physicalBlock)
  58 {
  59         off_t block = 0;
  60         bool isRecorded;
  61         status_t status = fMetadataIcb->FindBlock(logicalBlock, block, isRecorded);
  62         if (status != B_OK)
  63                 return status;
  64         if (!isRecorded) {
  65                 status = fMetadataMirrorIcb->FindBlock(logicalBlock, block, isRecorded);
  66                 if (status != B_OK)
  67                         return status;
  68                 if (!isRecorded)
  69                         return B_BAD_DATA;
  70         }
  71         return fParentPartition.MapBlock(block, physicalBlock);
  72 }
  73
  74 /*! Returns the initialization status of the object.
  75 */
  76 status_t
  77 MetadataPartition::InitCheck()
  78 {
  79         return fInitStatus;
  80 }