src/add-ons/kernel/file_systems/udf/SparablePartition.h

   1 //----------------------------------------------------------------------
   2 //  This software is part of the OpenBeOS distribution and is covered
   3 //  by the MIT License.
   4 //
   5 //  Copyright (c) 2003 Tyler Dauwalder, tyler@dauwalder.net
   6 //---------------------------------------------------------------------
   7 #ifndef _UDF_SPARABLE_PARTITION_H
   8 #define _UDF_SPARABLE_PARTITION_H
   9
  10 /*! \file SparablePartition.h
  11 */
  12
  13 #include <util/kernel_cpp.h>
  14
  15 #include "UdfStructures.h"
  16 #include "Partition.h"
  17 #include "UdfDebug.h"
  18
  19 /*! \brief Type 2 sparable partition
  20
  21         Sparable partitions provide a defect-managed partition
  22         space for media that does not implicitly provide defect management,
  23         such as CD-RW. Arbitrary packets of blocks in the sparable partition
  24         may be transparently remapped to other locations on disc should the
  25         original locations become defective.
  26
  27         Per UDF-2.01 2.2.11, sparable partitions shall be recorded only on
  28         disk/drive systems that do not perform defect management.
  29
  30         See also UDF-2.01 2.2.9, UDF-2.01 2.2.11
  31 */
  32 class SparablePartition : public Partition {
  33 public:
  34         SparablePartition(uint16 number, uint32 start, uint32 length, uint16 packetLength,
  35                           uint8 tableCount, uint32 *tableLocations);
  36         virtual ~SparablePartition();
  37         virtual status_t MapBlock(uint32 logicalBlock, off_t &physicalBlock);
  38
  39         status_t InitCheck();
  40
  41         uint16 Number() const { return fNumber; }
  42         uint32 Start() const { return fStart; }
  43         uint32 Length() const { return fLength; }
  44         uint32 PacketLength() const { return fPacketLength; }
  45         uint8 TableCount() const { return fTableCount; }
  46
  47         //! Maximum number of redundant sparing tables per SparablePartition
  48         static const uint8 kMaxSparingTableCount = UDF_MAX_SPARING_TABLE_COUNT;
  49 private:
  50         uint16 fNumber;
  51         uint32 fStart;
  52         uint32 fLength;
  53         uint32 fPacketLength;
  54         uint8 fTableCount;
  55         uint32 fTableLocations[kMaxSparingTableCount];
  56         status_t fInitStatus;
  57 };
  58
  59 #endif  // _UDF_SPARABLE_PARTITION_H