src/add-ons/kernel/file_systems/btrfs/Volume.h

   1 /*
   2  * Copyright 2017, Chế Vũ Gia Hy, cvghy116@gmail.com.
   3  * Copyright 2011, Jérôme Duval, korli@users.berlios.de.
   4  * Copyright 2008-2010, Axel Dörfler, axeld@pinc-software.de.
   5  * This file may be used under the terms of the MIT License.
   6  */
   7 #ifndef VOLUME_H
   8 #define VOLUME_H
   9
  10
  11 #include "btrfs.h"
  12
  13
  14 enum volume_flags {
  15         VOLUME_READ_ONLY        = 0x0001
  16 };
  17
  18 class BTree;
  19 class Chunk;
  20 class Inode;
  21 class Journal;
  22 class Transaction;
  23 class ExtentAllocator;
  24
  25
  26 class Volume {
  27 public:
  28                                                                 Volume(fs_volume* volume);
  29                                                                 ~Volume();
  30
  31                         status_t                        Mount(const char* device, uint32 flags);
  32                         status_t                        Unmount();
  33
  34                         bool                            IsValidSuperBlock();
  35                         bool                            IsReadOnly() const
  36                                                                         { return (fFlags & VOLUME_READ_ONLY) != 0; }
  37
  38                         Inode*                          RootNode() const { return fRootNode; }
  39                         int                                     Device() const { return fDevice; }
  40
  41                         dev_t                           ID() const
  42                                                                         { return fFSVolume ? fFSVolume->id : -1; }
  43                         fs_volume*                      FSVolume() const { return fFSVolume; }
  44                         const char*                     Name() const;
  45                         BTree*                          FSTree() const { return fFSTree; }
  46                         BTree*                          ExtentTree() const { return fExtentTree; }
  47                         BTree*                          RootTree() const { return fRootTree; }
  48
  49                         uint32                          SectorSize() const { return fSectorSize; }
  50                         uint32                          MaxInlineSize() const
  51                                                                         { return fSectorSize / 2; }
  52                         uint32                          BlockSize() const { return fBlockSize; }
  53                         ino_t                           GetNextInodeID() { return ++fLargestInodeID; }
  54                         Chunk*                          SystemChunk() const { return fChunk; }
  55                         Journal*                        GetJournal() const { return fJournal; }
  56                         ExtentAllocator*        GetAllocator() const { return fExtentAllocator; }
  57
  58                         btrfs_super_block&      SuperBlock() { return fSuperBlock; }
  59
  60                         status_t                        LoadSuperBlock();
  61
  62                         // cache access
  63                         void*                           BlockCache() { return fBlockCache; }
  64
  65         static  status_t                        Identify(int fd, btrfs_super_block* superBlock);
  66
  67                         status_t                        FindBlock(off_t logical, fsblock_t& physical);
  68                         status_t                        FindBlock(off_t logical, off_t& physical);
  69                         status_t                        GetNewBlock(uint64& logical, fsblock_t& physical,
  70                                                                         uint64 start = (uint64)-1,
  71                                                                         uint64 flags = BTRFS_BLOCKGROUP_FLAG_METADATA);
  72
  73 private:
  74                         mutex                           fLock;
  75                         fs_volume*                      fFSVolume;
  76                         int                                     fDevice;
  77                         ino_t                           fLargestInodeID;
  78                         btrfs_super_block       fSuperBlock;
  79                         char                            fName[32];
  80
  81                         uint32                          fFlags;
  82                         uint32                          fSectorSize;
  83                         uint32                          fBlockSize;
  84
  85                         void*                           fBlockCache;
  86                         Inode*                          fRootNode;
  87
  88                         ExtentAllocator*        fExtentAllocator;
  89                         Chunk*                          fChunk;
  90                         Journal*                        fJournal;
  91                         BTree*                          fChunkTree;
  92                         BTree*                          fRootTree;
  93                         BTree*                          fDevTree;
  94                         BTree*                          fExtentTree;
  95                         BTree*                          fFSTree;
  96                         BTree*                          fChecksumTree;
  97 };
  98
  99
 100 #endif  // VOLUME_H