2 * Acess2 Logical Volume Manager
3 * - By John Hodge (thePowersGang)
13 int LVM_int_CacheWriteback(void *ID, Uint64 Sector, const void *Buffer);
14 int LVM_int_VFSReadEmul(void *Arg, Uint64 BlockStart, size_t BlockCount, void *Dest);
15 int LVM_int_VFSWriteEmul(void *Arg, Uint64 BlockStart, size_t BlockCount, const void *Source);
18 // --------------------------------------------------------------------
19 // Managment / Initialisation
20 // --------------------------------------------------------------------
21 int LVM_AddVolumeVFS(const char *Name, int FD)
23 // Assuming 512-byte blocks, not a good idea
24 // return LVM_AddVolume(Name, (void*)(Uint)FD, 512, LVM_int_VFSReadEmul, LVM_int_VFSWriteEmul);
28 void *LVM_AddVolume(const tLVM_VolType *Type, const char *Name, void *Ptr, size_t BlockSize, size_t BlockCount)
33 if( BlockCount == 0 || BlockSize == 0 ) {
34 Log_Error("LVM", "BlockSize(0x%x)/BlockCount(0x%x) invalid in LVM_AddVolume",
35 BlockSize, BlockCount);
39 dummy_vol.Type = Type;
41 dummy_vol.BlockCount = BlockCount;
42 dummy_vol.BlockSize = BlockSize;
43 dummy_vol.CacheHandle = NULL;
45 // Read the first block of the volume
46 void *first_block = malloc(BlockSize);
48 Log_Error("LVM", "LVM_AddVolume - malloc error on %i bytes", BlockSize);
51 if( Type->Read(Ptr, 0, 1, first_block) != 1 ) {
52 Log_Error("LVM", "LVM_AddVolume - Failed to read first sector");
58 // TODO: Determine format
61 // Type->CountSubvolumes
62 dummy_vol.nSubVolumes = fmt->CountSubvolumes(&dummy_vol, first_block);
64 // Create real volume descriptor
65 // TODO: If this needs to be rescanned later, having the subvolume list separate might be an idea
66 size_t allocsize = sizeof(tLVM_Vol) + strlen(Name) + 1 + sizeof(tLVM_SubVolume*) * dummy_vol.nSubVolumes;
67 tLVM_Vol *real_vol = malloc( allocsize );
69 Log_Error("LVM", "LVM_AddVolume - malloc error on %i bytes", allocsize);
73 real_vol->Next = NULL;
74 real_vol->Type = Type;
76 real_vol->BlockSize = BlockSize;
77 real_vol->BlockCount = BlockCount;
78 real_vol->nSubVolumes = dummy_vol.nSubVolumes;
79 real_vol->SubVolumes = (void*)( real_vol->Name + strlen(Name) + 1 );
80 real_vol->BlockSize = BlockSize;
81 strcpy(real_vol->Name, Name);
82 memset(real_vol->SubVolumes, 0, sizeof(tLVM_SubVolume*) * real_vol->nSubVolumes);
84 memset(&real_vol->DirNode, 0, sizeof(tVFS_Node));
85 real_vol->DirNode.Type = &gLVM_VolNodeType;
86 real_vol->DirNode.ImplPtr = real_vol;
87 real_vol->DirNode.Flags = VFS_FFLAG_DIRECTORY;
88 real_vol->DirNode.Size = -1;
89 memset(&real_vol->VolNode, 0, sizeof(tVFS_Node));
90 real_vol->VolNode.Type = &gLVM_VolNodeType;
91 real_vol->VolNode.ImplPtr = real_vol;
92 real_vol->VolNode.Size = BlockCount * BlockSize;
94 // TODO: Better selection of cache size
95 // TODO: Allow a volume type to disallow caching
97 real_vol->CacheHandle = IOCache_Create(LVM_int_CacheWriteback, real_vol, BlockSize, 1024);
99 real_vol->CacheHandle = NULL;
102 // Type->PopulateSubvolumes
103 fmt->PopulateSubvolumes(real_vol, first_block);
106 // Add to volume list
107 gpLVM_LastVolume->Next = real_vol;
108 gpLVM_LastVolume = real_vol;
113 void LVM_int_SetSubvolume_Anon(tLVM_Vol *Volume, int Index, Uint64 FirstBlock, Uint64 BlockCount)
118 if( Index < 0 || Index >= Volume->nSubVolumes ) {
119 Log_Warning("LVM", "SV ID is out of range (0 < %i < %i)",
120 Index, Volume->nSubVolumes);
124 if( Volume->SubVolumes[Index] ) {
125 Log_Warning("LVM", "Attempt to set SV %i of %p twice", Index, Volume);
129 namelen = snprintf(NULL, 0, "%i", Index);
131 sv = malloc( sizeof(tLVM_SubVolume) + namelen + 1 );
136 Volume->SubVolumes[Index] = sv;
139 sprintf(sv->Name, "%i", Index);
140 sv->FirstBlock = FirstBlock;
141 sv->BlockCount = BlockCount;
142 memset(&sv->Node, 0, sizeof(tVFS_Node));
144 sv->Node.ImplPtr = sv;
145 sv->Node.Type = &gLVM_SubVolNodeType;
146 sv->Node.Size = BlockCount * Volume->BlockSize;
148 Log_Log("LVM", "Partition %s/%s - 0x%llx+0x%llx blocks",
149 Volume->Name, sv->Name, FirstBlock, BlockCount);
152 // --------------------------------------------------------------------
154 // --------------------------------------------------------------------
155 int LVM_int_CacheWriteback(void *ID, Uint64 Sector, const void *Buffer)
157 tLVM_Vol *Volume = ID;
158 return Volume->Type->Write(Volume->Ptr, Sector, 1, Buffer);
161 size_t LVM_int_ReadVolume(tLVM_Vol *Volume, Uint64 BlockNum, size_t BlockCount, void *Dest)
164 if( Volume->CacheHandle )
167 while( done < BlockCount )
169 while( done < BlockCount && IOCache_Read(Volume->CacheHandle, BlockNum+done, Dest) == 1 )
170 done ++, Dest = (char*)Dest + Volume->BlockSize;
171 size_t first_uncached = done;
172 void *uncache_buf = Dest;
173 LOG("%i/%i: cached", done, BlockCount);
174 while( done < BlockCount && IOCache_Read(Volume->CacheHandle, BlockNum+done, Dest) == 0 )
175 done ++, Dest = (char*)Dest + Volume->BlockSize;
176 LOG("%i/%i: uncached", done, BlockCount);
177 size_t count = done-first_uncached;
179 Volume->Type->Read(Volume->Ptr, BlockNum+first_uncached, count, uncache_buf);
182 IOCache_Add(Volume->CacheHandle, BlockNum+first_uncached, uncache_buf);
184 uncache_buf = (char*)uncache_buf + Volume->BlockSize;
192 return Volume->Type->Read(Volume->Ptr, BlockNum, BlockCount, Dest);
195 size_t LVM_int_WriteVolume(tLVM_Vol *Volume, Uint64 BlockNum, size_t BlockCount, const void *Src)
198 if( Volume->CacheHandle )
203 IOCache_Write(Volume->CacheHandle, BlockNum, Src);
204 Src = (const char*)Src + Volume->BlockSize;
213 return Volume->Type->Write(Volume->Ptr, BlockNum, BlockCount, Src);
216 int LVM_int_VFSReadEmul(void *Arg, Uint64 BlockStart, size_t BlockCount, void *Dest)
221 blocksize = 512; // TODO: Don't assume
223 rv = VFS_ReadAt( (int)(Uint)Arg, BlockStart * blocksize, BlockCount * blocksize, Dest );
228 int LVM_int_VFSWriteEmul(void *Arg, Uint64 BlockStart, size_t BlockCount, const void *Source)
233 blocksize = 512; // TODO: Don't assume
235 rv = VFS_WriteAt( (int)(Uint)Arg, BlockStart * blocksize, BlockCount * blocksize, Source );