+++ /dev/null
-/*
- * AcessMicro VFS
- * - Root Filesystem Driver
- */
-#include <acess.h>
-#include <vfs.h>
-#include <vfs_ramfs.h>
-
-// === CONSTANTS ===
-#define MAX_FILES 64
-
-// === PROTOTYPES ===
-tVFS_Node *Root_InitDevice(char *Device, char **Options);
- int Root_MkNod(tVFS_Node *Node, char *Name, Uint Flags);
-tVFS_Node *Root_FindDir(tVFS_Node *Node, char *Name);
-char *Root_ReadDir(tVFS_Node *Node, int Pos);
-Uint64 Root_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
-Uint64 Root_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
-tRamFS_File *Root_int_AllocFile();
-
-// === GLOBALS ===
-tVFS_Driver gRootFS_Info = {
- "rootfs", 0,
- Root_InitDevice,
- NULL, // Unmount
- NULL
-};
-tRamFS_File RootFS_Files[MAX_FILES];
-tVFS_ACL RootFS_ACLs[3] = {
- {{0,0}, {0,VFS_PERM_ALL}}, // Owner (Root)
- {{1,0}, {0,VFS_PERM_ALL}}, // Group (Root)
- {{0,-1}, {0,VFS_PERM_ALL}} // World (Nobody)
-};
-
-// === CODE ===
-/**
- * \fn tVFS_Node *Root_InitDevice(char *Device, char **Options)
- * \brief Initialise the root filesystem
- */
-tVFS_Node *Root_InitDevice(char *Device, char **Options)
-{
- tRamFS_File *root;
- if(strcmp(Device, "root") != 0) {
- return NULL;
- }
-
- // Create Root Node
- root = &RootFS_Files[0];
-
- root->Node.ImplPtr = root;
-
- root->Node.CTime
- = root->Node.MTime
- = root->Node.ATime = now();
- root->Node.NumACLs = 3;
- root->Node.ACLs = RootFS_ACLs;
-
- //root->Node.Close = Root_CloseFile; // Not Needed (It's a RAM Disk!)
- //root->Node.Relink = Root_RelinkRoot; // Not Needed (Why relink the root of the tree)
- root->Node.FindDir = Root_FindDir;
- root->Node.ReadDir = Root_ReadDir;
- root->Node.MkNod = Root_MkNod;
-
- return &root->Node;
-}
-
-/**
- * \fn int Root_MkNod(tVFS_Node *Node, char *Name, Uint Flags)
- * \brief Create an entry in the root directory
- */
-int Root_MkNod(tVFS_Node *Node, char *Name, Uint Flags)
-{
- tRamFS_File *parent = Node->ImplPtr;
- tRamFS_File *child = parent->Data.FirstChild;
- tRamFS_File *prev = (tRamFS_File *) &parent->Data.FirstChild;
-
- ENTER("pNode sName xFlags", Node, Name, Flags);
-
- // Find last child, while we're at it, check for duplication
- for( ; child; prev = child, child = child->Next )
- {
- if(strcmp(child->Name, Name) == 0) {
- LEAVE('i', 0);
- return 0;
- }
- }
-
- child = Root_int_AllocFile();
- memset(child, 0, sizeof(tRamFS_File));
-
- child->Name = malloc(strlen(Name)+1);
- strcpy(child->Name, Name);
-
- child->Parent = parent;
- child->Next = NULL;
- child->Data.FirstChild = NULL;
-
- child->Node.ImplPtr = child;
- child->Node.Flags = Flags;
- child->Node.NumACLs = 0;
- child->Node.Size = 0;
-
- if(Flags & VFS_FFLAG_DIRECTORY)
- {
- child->Node.ReadDir = Root_ReadDir;
- child->Node.FindDir = Root_FindDir;
- child->Node.MkNod = Root_MkNod;
- } else {
- child->Node.Read = Root_Read;
- child->Node.Write = Root_Write;
- }
-
- prev->Next = child;
-
- parent->Node.Size ++;
-
- LEAVE('i', 1);
- return 1;
-}
-
-/**
- * \fn tVFS_Node *Root_FindDir(tVFS_Node *Node, char *Name)
- * \brief Find an entry in the filesystem
- */
-tVFS_Node *Root_FindDir(tVFS_Node *Node, char *Name)
-{
- tRamFS_File *parent = Node->ImplPtr;
- tRamFS_File *child = parent->Data.FirstChild;
-
- //Log("Root_FindDir: (Node=%p, Name='%s')", Node, Name);
-
- for(;child;child = child->Next)
- {
- //Log(" Root_FindDir: strcmp('%s', '%s')", child->Node.Name, Name);
- if(strcmp(child->Name, Name) == 0) return &child->Node;
- }
-
- return NULL;
-}
-
-/**
- * \fn char *Root_ReadDir(tVFS_Node *Node, int Pos)
- * \brief Get an entry from the filesystem
- */
-char *Root_ReadDir(tVFS_Node *Node, int Pos)
-{
- tRamFS_File *parent = Node->ImplPtr;
- tRamFS_File *child = parent->Data.FirstChild;
-
- for( ; child && Pos--; child = child->Next ) ;
-
- if(Pos) return strdup(child->Name);
-
- return NULL;
-}
-
-/**
- * \fn Uint64 Root_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
- * \brief Read from a file in the root directory
- */
-Uint64 Root_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
-{
- tRamFS_File *file = Node->ImplPtr;
-
- if(Offset > Node->Size) return 0;
- if(Length > Node->Size) return 0;
-
- if(Offset+Length > Node->Size)
- Length = Node->Size - Offset;
-
- memcpy(Buffer, file->Data.Bytes+Offset, Length);
-
- return Length;
-}
-
-/**
- * \fn Uint64 Root_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
- * \brief Write to a file in the root directory
- */
-Uint64 Root_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
-{
- tRamFS_File *file = Node->ImplPtr;
-
- // Check if buffer needs to be expanded
- if(Offset + Length > Node->Size)
- {
- void *tmp = realloc( file->Data.Bytes, Offset + Length );
- if(tmp == NULL) {
- Warning("Root_Write - Increasing buffer size failed");
- return -1;
- }
- file->Data.Bytes = tmp;
- Node->Size = Offset + Length;
- //LOG("Expanded buffer to %i bytes", Node->Size);
- }
-
- memcpy(file->Data.Bytes+Offset, Buffer, Length);
-
- return Length;
-}
-
-/**
- * \fn tRamFS_File *Root_int_AllocFile()
- * \brief Allocates a file from the pool
- */
-tRamFS_File *Root_int_AllocFile()
-{
- int i;
- for( i = 0; i < MAX_FILES; i ++ )
- {
- if( RootFS_Files[i].Name == NULL )
- {
- return &RootFS_Files[i];
- }
- }
- return NULL;
-}
git.ucc.asn.au / tpg / acess2.git / blobdiff
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