KernelLand/Modules/Storage/LVM/volumes.c

   1 /*
   2  * Acess2 Logical Volume Manager
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * volumes.c
   6  * - Volume management
   7  */
   8 #include "lvm_int.h"
   9
  10 // === PROTOTYPES ===
  11  int    LVM_int_VFSReadEmul(void *Arg, Uint64 BlockStart, size_t BlockCount, void *Dest);
  12  int    LVM_int_VFSWriteEmul(void *Arg, Uint64 BlockStart, size_t BlockCount, const void *Source);
  13
  14 // === CODE ===
  15 // --------------------------------------------------------------------
  16 // Managment / Initialisation
  17 // --------------------------------------------------------------------
  18 int LVM_AddVolumeVFS(const char *Name, int FD)
  19 {
  20         return LVM_AddVolume(Name, (void*)FD, LVM_int_VFSReadEmul, LVM_int_VFSWriteEmul);
  21 }
  22
  23 int LVM_AddVolume(const char *Name, void *Ptr, tLVM_ReadFcn Read, tLVM_WriteFcn Write)
  24 {
  25         tLVM_Vol        dummy_vol;
  26 //      tLVM_Vol        *real_vol;
  27
  28         dummy_vol.Ptr = Ptr;
  29         dummy_vol.Read = Read;
  30         dummy_vol.Write = Write;
  31
  32         // Determine Type
  33
  34         // Type->CountSubvolumes
  35
  36         // Create real volume descriptor
  37
  38         // Type->PopulateSubvolumes
  39
  40         // Add to volume list
  41
  42         return 0;
  43 }
  44
  45 void LVM_int_SetSubvolume_Anon(tLVM_Vol *Volume, int Index, Uint64 FirstBlock, Uint64 BlockCount)
  46 {
  47         tLVM_SubVolume  *sv;
  48          int    namelen;
  49
  50         if( Index < 0 || Index >= Volume->nSubVolumes ) {
  51                 Log_Warning("LVM", "SV ID is out of range (0 < %i < %i)",
  52                         Index, Volume->nSubVolumes);
  53                 return ;
  54         }
  55
  56         if( Volume->SubVolumes[Index] ) {
  57                 Log_Warning("LVM", "Attempt to set SV %i of %p twice", Index, Volume);
  58                 return ;
  59         }
  60
  61         namelen = snprintf(NULL, 0, "%i", Index);
  62
  63         sv = malloc( sizeof(tLVM_SubVolume) + namelen + 1 );
  64         if(!sv) {
  65                 // Oh, f*ck
  66                 return ;
  67         }
  68         Volume->SubVolumes[Index] = sv;
  69
  70         sv->Vol = Volume;
  71         sprintf(sv->Name, "%i", Index);
  72         sv->FirstBlock = FirstBlock;
  73         sv->BlockCount = BlockCount;
  74         memset(&sv->Node, 0, sizeof(tVFS_Node));
  75
  76         sv->Node.ImplPtr = sv;
  77         sv->Node.Type = &gLVM_SubVolNodeType;
  78 }
  79
  80 // --------------------------------------------------------------------
  81 // IO
  82 // --------------------------------------------------------------------
  83 size_t LVM_int_ReadVolume(tLVM_Vol *Volume, Uint64 BlockNum, size_t BlockCount, void *Dest)
  84 {
  85         return Volume->Read(Volume->Ptr, BlockNum, BlockCount, Dest);
  86 }
  87
  88 size_t LVM_int_WriteVolume(tLVM_Vol *Volume, Uint64 BlockNum, size_t BlockCount, const void *Src)
  89 {
  90         return Volume->Write(Volume->Ptr, BlockNum, BlockCount, Src);
  91 }
  92
  93 int LVM_int_VFSReadEmul(void *Arg, Uint64 BlockStart, size_t BlockCount, void *Dest)
  94 {
  95         size_t  blocksize;
  96         size_t  rv;
  97
  98         blocksize = 512;        // TODO: Don't assume
  99
 100         rv = VFS_ReadAt( (int)Arg, BlockStart * blocksize, BlockCount * blocksize, Dest );
 101         rv /= blocksize;
 102         return rv;
 103 }
 104
 105 int LVM_int_VFSWriteEmul(void *Arg, Uint64 BlockStart, size_t BlockCount, const void *Source)
 106 {
 107         size_t  blocksize;
 108         size_t  rv;
 109
 110         blocksize = 512;        // TODO: Don't assume
 111
 112         rv = VFS_WriteAt( (int)Arg, BlockStart * blocksize, BlockCount * blocksize, Source );
 113         rv /= blocksize;
 114         return rv;
 115 }
 116