src/add-ons/kernel/file_systems/ext2/ExtentStream.h

   1 /*
   2  * Copyright 2001-2011, Haiku Inc. All rights reserved.
   3  * This file may be used under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *              Jérôme Duval
   7  */
   8 #ifndef EXTENTSTREAM_H
   9 #define EXTENTSTREAM_H
  10
  11
  12 #include "ext2.h"
  13 #include "Transaction.h"
  14
  15
  16 class Volume;
  17
  18
  19 class ExtentStream
  20 {
  21 public:
  22                                         ExtentStream(Volume* volume, ext2_extent_stream* stream,
  23                                                 off_t size);
  24                                         ~ExtentStream();
  25
  26         status_t                FindBlock(off_t offset, fsblock_t& block,
  27                                                 uint32 *_count = NULL);
  28         status_t                Enlarge(Transaction& transaction, off_t& numBlocks);
  29         status_t                Shrink(Transaction& transaction, off_t& numBlocks);
  30         void                    Init();
  31
  32         bool                    Check();
  33
  34 private:
  35         status_t                _Check(ext2_extent_stream *stream, fileblock_t &block);
  36         status_t                _CheckBlock(ext2_extent_stream *stream, fsblock_t block);
  37
  38         Volume*                 fVolume;
  39         ext2_extent_stream* fStream;
  40         fsblock_t               fFirstBlock;
  41
  42         fsblock_t               fAllocatedPos;
  43
  44         off_t                   fNumBlocks;
  45         off_t                   fSize;
  46 };
  47
  48 #endif  // EXTENTSTREAM_H
  49