--- /dev/null
+/*
+ * Acess OS
+ * Ext2 Driver Version 1
+ */
+/**
+ * \file dir.c
+ * \brief Second Extended Filesystem Driver
+ * \todo Implement file full write support
+ */
+#define DEBUG 1
+#define VERBOSE 0
+#include "ext2_common.h"
+
+
+// === PROTOTYPES ===
+char *Ext2_ReadDir(tVFS_Node *Node, int Pos);
+tVFS_Node *Ext2_FindDir(tVFS_Node *Node, char *FileName);
+ int Ext2_MkNod(tVFS_Node *Node, char *Name, Uint Flags);
+tVFS_Node *Ext2_int_CreateNode(tExt2_Disk *Disk, Uint InodeId, char *Name);
+
+// === CODE ===
+/**
+ \fn char *Ext2_ReadDir(tVFS_Node *Node, int Pos)
+ \brief Reads a directory entry
+*/
+char *Ext2_ReadDir(tVFS_Node *Node, int Pos)
+{
+ tExt2_Inode inode;
+ char namebuf[EXT2_NAME_LEN+1];
+ tExt2_DirEnt dirent;
+ Uint64 Base; // Block's Base Address
+ int block = 0, ofs = 0;
+ int entNum = 0;
+ tExt2_Disk *disk = Node->ImplPtr;
+ Uint size;
+
+ ENTER("pNode iPos", Node, Pos);
+
+ // Read directory's inode
+ //Ext2_int_GetInode(Node, &inode);
+ Ext2_int_ReadInode(disk, Node->Inode, &inode);
+ size = inode.i_size;
+
+ LOG("inode.i_block[0] = 0x%x", inode.i_block[0]);
+
+ // Find Entry
+ // Get First Block
+ // - Do this ourselves as it is a simple operation
+ Base = inode.i_block[0] * disk->BlockSize;
+ while(Pos -- && size > 0)
+ {
+ VFS_ReadAt( disk->FD, Base+ofs, sizeof(tExt2_DirEnt), &dirent);
+ ofs += dirent.rec_len;
+ size -= dirent.rec_len;
+ entNum ++;
+
+ if(ofs >= disk->BlockSize) {
+ block ++;
+ if( ofs > disk->BlockSize ) {
+ Warning("[EXT2] Directory Entry %i of inode %i extends over a block boundary, ignoring",
+ entNum-1, Node->Inode);
+ }
+ ofs = 0;
+ Base = Ext2_int_GetBlockAddr( disk, inode.i_block, block );
+ }
+ }
+
+ // Check for the end of the list
+ if(size <= 0) {
+ LEAVE('n');
+ return NULL;
+ }
+
+ // Read Entry
+ VFS_ReadAt( disk->FD, Base+ofs, sizeof(tExt2_DirEnt), &dirent );
+ //LOG("dirent.inode = %i", dirent.inode);
+ //LOG("dirent.rec_len = %i", dirent.rec_len);
+ //LOG("dirent.name_len = %i", dirent.name_len);
+ VFS_ReadAt( disk->FD, Base+ofs+sizeof(tExt2_DirEnt), dirent.name_len, namebuf );
+ namebuf[ dirent.name_len ] = '\0'; // Cap off string
+
+
+ // Ignore . and .. (these are done in the VFS)
+ if( (namebuf[0] == '.' && namebuf[1] == '\0')
+ || (namebuf[0] == '.' && namebuf[1] == '.' && namebuf[2]=='\0')) {
+ LEAVE('p', VFS_SKIP);
+ return VFS_SKIP; // Skip
+ }
+
+ LEAVE('s', namebuf);
+ // Create new node
+ return strdup(namebuf);
+}
+
+/**
+ \fn tVFS_Node *Ext2_FindDir(tVFS_Node *node, char *filename)
+ \brief Gets information about a file
+ \param node vfs node - Parent Node
+ \param filename String - Name of file
+ \return VFS Node of file
+*/
+tVFS_Node *Ext2_FindDir(tVFS_Node *Node, char *Filename)
+{
+ tExt2_Disk *disk = Node->ImplPtr;
+ tExt2_Inode inode;
+ char namebuf[EXT2_NAME_LEN+1];
+ tExt2_DirEnt dirent;
+ Uint64 Base; // Block's Base Address
+ int block = 0, ofs = 0;
+ int entNum = 0;
+ Uint size;
+
+ // Read directory's inode
+ Ext2_int_ReadInode(disk, Node->Inode, &inode);
+ size = inode.i_size;
+
+ // Get First Block
+ // - Do this ourselves as it is a simple operation
+ Base = inode.i_block[0] * disk->BlockSize;
+ // Find File
+ while(size > 0)
+ {
+ VFS_ReadAt( disk->FD, Base+ofs, sizeof(tExt2_DirEnt), &dirent);
+ VFS_ReadAt( disk->FD, Base+ofs+sizeof(tExt2_DirEnt), dirent.name_len, namebuf );
+ namebuf[ dirent.name_len ] = '\0'; // Cap off string
+ // If it matches, create a node and return it
+ if(strcmp(namebuf, Filename) == 0)
+ return Ext2_int_CreateNode( disk, dirent.inode, namebuf );
+ // Increment pointers
+ ofs += dirent.rec_len;
+ size -= dirent.rec_len;
+ entNum ++;
+
+ // Check for end of block
+ if(ofs >= disk->BlockSize) {
+ block ++;
+ if( ofs > disk->BlockSize ) {
+ Warning("[EXT2 ] Directory Entry %i of inode %i extends over a block boundary, ignoring",
+ entNum-1, Node->Inode);
+ }
+ ofs = 0;
+ Base = Ext2_int_GetBlockAddr( disk, inode.i_block, block );
+ }
+ }
+
+ return NULL;
+}
+
+/**
+ * \fn int Ext2_MkNod(tVFS_Node *Parent, char *Name, Uint Flags)
+ * \brief Create a new node
+ */
+int Ext2_MkNod(tVFS_Node *Parent, char *Name, Uint Flags)
+{
+ return 0;
+}
+
+// ---- INTERNAL FUNCTIONS ----
+/**
+ * \fn vfs_node *Ext2_int_CreateNode(tExt2_Disk *Disk, Uint InodeID, char *Name)
+ * \brief Create a new VFS Node
+ */
+tVFS_Node *Ext2_int_CreateNode(tExt2_Disk *Disk, Uint InodeID, char *Name)
+{
+ tExt2_Inode inode;
+ tVFS_Node retNode;
+ tVFS_Node *tmpNode;
+
+ if( !Ext2_int_ReadInode(Disk, InodeID, &inode) )
+ return NULL;
+
+ if( (tmpNode = Inode_GetCache(Disk->CacheID, InodeID)) )
+ return tmpNode;
+
+
+ // Set identifiers
+ retNode.Inode = InodeID;
+ retNode.ImplPtr = Disk;
+
+ // Set file length
+ retNode.Size = inode.i_size;
+
+ // Set Access Permissions
+ retNode.UID = inode.i_uid;
+ retNode.GID = inode.i_gid;
+ retNode.NumACLs = 3;
+ retNode.ACLs = VFS_UnixToAcessACL(inode.i_mode & 0777, inode.i_uid, inode.i_gid);
+
+ // Set Function Pointers
+ retNode.Read = Ext2_Read;
+ retNode.Write = Ext2_Write;
+ retNode.Close = Ext2_CloseFile;
+
+ switch(inode.i_mode & EXT2_S_IFMT)
+ {
+ // Symbolic Link
+ case EXT2_S_IFLNK:
+ retNode.Flags = VFS_FFLAG_SYMLINK;
+ break;
+ // Regular File
+ case EXT2_S_IFREG:
+ retNode.Flags = 0;
+ retNode.Size |= (Uint64)inode.i_dir_acl << 32;
+ break;
+ // Directory
+ case EXT2_S_IFDIR:
+ retNode.ReadDir = Ext2_ReadDir;
+ retNode.FindDir = Ext2_FindDir;
+ retNode.MkNod = Ext2_MkNod;
+ //retNode.Relink = Ext2_Relink;
+ retNode.Flags = VFS_FFLAG_DIRECTORY;
+ break;
+ // Unknown, Write protect and hide it to be safe
+ default:
+ retNode.Flags = VFS_FFLAG_READONLY;//|VFS_FFLAG_HIDDEN;
+ break;
+ }
+
+ // Check if the file should be hidden
+ //if(Name[0] == '.') retNode.Flags |= VFS_FFLAG_HIDDEN;
+
+ // Set Timestamps
+ retNode.ATime = now();
+ retNode.MTime = inode.i_mtime * 1000;
+ retNode.CTime = inode.i_ctime * 1000;
+
+ // Save in node cache and return saved node
+ return Inode_CacheNode(Disk->CacheID, &retNode);
+}
git.ucc.asn.au / tpg / acess2.git / blobdiff
UCC git Repository :: git.ucc.asn.au