+/*
+ * Acess2 Logical Volume Manager
+ * - By John Hodge (thePowersGang)
+ *
+ * main.c
+ * - LVM Core Code
+ */
+#define DEBUG 0
+#define VERSION VER2(0,1)
+#include "lvm_int.h"
+#include <fs_devfs.h>
+#include <modules.h>
+#include <api_drv_disk.h>
+
+// === PROTOTYPES ===
+// ---
+ int LVM_Initialise(char **Arguments);
+ int LVM_Cleanup(void);
+// ---
+ int LVM_Root_ReadDir(tVFS_Node *Node, int ID, char Dest[FILENAME_MAX]);
+tVFS_Node *LVM_Root_FindDir(tVFS_Node *Node, const char *Name, Uint Flags);
+ int LVM_Vol_ReadDir(tVFS_Node *Node, int ID, char Dest[FILENAME_MAX]);
+tVFS_Node *LVM_Vol_FindDir(tVFS_Node *Node, const char *Name, Uint Flags);
+size_t LVM_Vol_Read(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer, Uint Flags);
+size_t LVM_Vol_Write(tVFS_Node *Node, off_t Offset, size_t Length, const void *Buffer, Uint Flags);
+size_t LVM_SubVol_Read(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer, Uint Flags);
+size_t LVM_SubVol_Write(tVFS_Node *Node, off_t Offset, size_t Length, const void *Buffer, Uint Flags);
+void LVM_CloseNode(tVFS_Node *Node);
+
+Uint LVM_int_DrvUtil_ReadBlock(Uint64 Address, Uint Count, void *Buffer, void *Argument);
+Uint LVM_int_DrvUtil_WriteBlock(Uint64 Address, Uint Count, const void *Buffer, void *Argument);
+
+// === GLOBALS ===
+MODULE_DEFINE(0, VERSION, LVM, LVM_Initialise, LVM_Cleanup, NULL);
+tVFS_NodeType gLVM_RootNodeType = {
+ .ReadDir = LVM_Root_ReadDir,
+ .FindDir = LVM_Root_FindDir
+};
+tVFS_NodeType gLVM_VolNodeType = {
+ .ReadDir = LVM_Vol_ReadDir,
+ .FindDir = LVM_Vol_FindDir,
+ .Read = LVM_Vol_Read,
+ .Write = LVM_Vol_Write,
+ .Close = LVM_CloseNode
+};
+tVFS_NodeType gLVM_SubVolNodeType = {
+ .Read = LVM_SubVol_Read,
+ .Write = LVM_SubVol_Write,
+ .Close = LVM_CloseNode
+};
+tDevFS_Driver gLVM_DevFS = {
+ NULL, "LVM",
+ {.Flags = VFS_FFLAG_DIRECTORY, .Type = &gLVM_RootNodeType, .Size = -1}
+};
+
+tLVM_Vol *gpLVM_FirstVolume;
+tLVM_Vol *gpLVM_LastVolume = (void*)&gpLVM_FirstVolume;
+
+// === CODE ===
+int LVM_Initialise(char **Arguments)
+{
+ DevFS_AddDevice( &gLVM_DevFS );
+ return 0;
+}
+
+int LVM_Cleanup(void)
+{
+ // Attempt to destroy all volumes
+ tLVM_Vol *vol, *prev = NULL, *next;
+
+ // TODO: Locks?
+ for( vol = gpLVM_FirstVolume; vol; prev = vol, vol = next )
+ {
+ next = vol->Next;
+ int nFree = 0;
+
+ for( int i = 0; i < vol->nSubVolumes; i ++ )
+ {
+ tLVM_SubVolume *sv;
+ sv = vol->SubVolumes[i];
+ if( sv == NULL ) {
+ nFree ++;
+ continue;
+ }
+
+ Mutex_Acquire(&sv->Node.Lock);
+ if(sv->Node.ReferenceCount == 0) {
+ nFree ++;
+ vol->SubVolumes[i] = NULL;
+ Mutex_Release(&sv->Node.Lock);
+ }
+ else {
+ Mutex_Release(&sv->Node.Lock);
+ continue ;
+ }
+
+ Mutex_Acquire(&sv->Node.Lock);
+ LOG("Removed subvolume %s:%s", vol->Name, sv->Name);
+ free(sv);
+ }
+
+ if( nFree != vol->nSubVolumes )
+ continue ;
+
+ if(prev)
+ prev->Next = next;
+ else
+ gpLVM_FirstVolume = next;
+
+ Mutex_Acquire(&vol->DirNode.Lock);
+ Mutex_Acquire(&vol->VolNode.Lock);
+ if( vol->Type->Cleanup )
+ vol->Type->Cleanup( vol->Ptr );
+ if( vol->CacheHandle )
+ IOCache_Destroy(vol->CacheHandle);
+ LOG("Removed volume %s", vol->Name);
+ free(vol);
+ }
+
+ if( gpLVM_FirstVolume )
+ return EBUSY;
+
+ return EOK;
+}
+
+// --------------------------------------------------------------------
+// VFS Inteface
+// --------------------------------------------------------------------
+int LVM_Root_ReadDir(tVFS_Node *Node, int ID, char Dest[FILENAME_MAX])
+{
+ tLVM_Vol *vol;
+
+ if( ID < 0 ) return -EINVAL;
+
+ // TODO: Sub-dirs for 'by-uuid', 'by-label' etc
+
+ for( vol = gpLVM_FirstVolume; vol && ID --; vol = vol->Next );
+
+ if(vol) {
+ strncpy(Dest, vol->Name, FILENAME_MAX);
+ return 0;
+ }
+ else
+ return -ENOENT;
+}
+tVFS_Node *LVM_Root_FindDir(tVFS_Node *Node, const char *Name, Uint Flags)
+{
+ tLVM_Vol *vol;
+ for( vol = gpLVM_FirstVolume; vol; vol = vol->Next )
+ {
+ if( strcmp(vol->Name, Name) == 0 )
+ {
+ vol->DirNode.ReferenceCount ++;
+ return &vol->DirNode;
+ }
+ }
+ return NULL;
+}
+
+int LVM_Vol_ReadDir(tVFS_Node *Node, int ID, char Dest[FILENAME_MAX])
+{
+ tLVM_Vol *vol = Node->ImplPtr;
+ const char *src;
+
+ if( ID < 0 || ID >= vol->nSubVolumes+1 )
+ return -EINVAL;
+
+ if( ID == 0 ) {
+ src = "ROOT";
+ }
+ else {
+ src = vol->SubVolumes[ID-1]->Name;
+ }
+ strncpy(Dest, src, FILENAME_MAX);
+ return 0;
+}
+tVFS_Node *LVM_Vol_FindDir(tVFS_Node *Node, const char *Name, Uint Flags)
+{
+ tLVM_Vol *vol = Node->ImplPtr;
+
+ if( strcmp("ROOT", Name) == 0 )
+ return &vol->VolNode;
+
+ for( int i = 0; i < vol->nSubVolumes; i ++ )
+ {
+ if( strcmp(vol->SubVolumes[i]->Name, Name) == 0 )
+ {
+ vol->SubVolumes[i]->Node.ReferenceCount ++;
+ return &vol->SubVolumes[i]->Node;
+ }
+ }
+
+ return NULL;
+}
+
+size_t LVM_Vol_Read(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer, Uint Flags)
+{
+ tLVM_Vol *vol = Node->ImplPtr;
+ Uint64 byte_size = vol->BlockCount * vol->BlockSize;
+
+ if( Offset > byte_size )
+ return 0;
+ if( Length > byte_size )
+ Length = byte_size;
+ if( Offset + Length > byte_size )
+ Length = byte_size - Offset;
+
+ return DrvUtil_ReadBlock(
+ Offset, Length, Buffer,
+ LVM_int_DrvUtil_ReadBlock, vol->BlockSize, vol
+ );
+}
+
+size_t LVM_Vol_Write(tVFS_Node *Node, off_t Offset, size_t Length, const void *Buffer, Uint Flags)
+{
+ return 0;
+}
+
+size_t LVM_SubVol_Read(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer, Uint Flags)
+{
+ tLVM_SubVolume *sv = Node->ImplPtr;
+ Uint64 byte_size = sv->BlockCount * sv->Vol->BlockSize;
+
+ if( Offset > byte_size )
+ return 0;
+ if( Length > byte_size )
+ Length = byte_size;
+ if( Offset + Length > byte_size )
+ Length = byte_size - Offset;
+
+ LOG("Reading (0x%llx+0x%llx)+0x%x to %p",
+ (Uint64)(sv->FirstBlock * sv->Vol->BlockSize), Offset,
+ Length, Buffer
+ );
+
+ Offset += sv->FirstBlock * sv->Vol->BlockSize;
+
+ return DrvUtil_ReadBlock(
+ Offset, Length, Buffer,
+ LVM_int_DrvUtil_ReadBlock, sv->Vol->BlockSize, sv->Vol
+ );
+}
+size_t LVM_SubVol_Write(tVFS_Node *Node, off_t Offset, size_t Length, const void *Buffer, Uint Flags)
+{
+ tLVM_SubVolume *sv = Node->ImplPtr;
+ Uint64 byte_size = sv->BlockCount * sv->Vol->BlockSize;
+
+ if( Offset > byte_size )
+ return 0;
+ if( Length > byte_size )
+ Length = byte_size;
+ if( Offset + Length > byte_size )
+ Length = byte_size - Offset;
+
+ Offset += sv->FirstBlock * sv->Vol->BlockSize;
+
+ return DrvUtil_WriteBlock(
+ Offset, Length, Buffer,
+ LVM_int_DrvUtil_ReadBlock, LVM_int_DrvUtil_WriteBlock,
+ sv->Vol->BlockSize, sv->Vol
+ );
+}
+
+void LVM_CloseNode(tVFS_Node *Node)
+{
+ Node->ReferenceCount --;
+}
+
+Uint LVM_int_DrvUtil_ReadBlock(Uint64 Address, Uint Count, void *Buffer, void *Argument)
+{
+ return LVM_int_ReadVolume( Argument, Address, Count, Buffer );
+}
+
+Uint LVM_int_DrvUtil_WriteBlock(Uint64 Address, Uint Count, const void *Buffer, void *Argument)
+{
+ return LVM_int_WriteVolume( Argument, Address, Count, Buffer );
+}
+
git.ucc.asn.au / tpg / acess2.git / blobdiff
UCC git Repository :: git.ucc.asn.au