#include "ext2_common.h"
// === MACROS ===
-#define BLOCK_DIR_OFS(_data, _block) ((Uint16*)(_data)[(_block)])
+#define BLOCK_DIR_OFS(_data, _block) (((Uint16*)(_data))[(_block)])
// === PROTOTYPES ===
char *Ext2_ReadDir(tVFS_Node *Node, int Pos);
Uint64 inodeNum = Ext2_int_AllocateInode(Parent->ImplPtr, Parent->Inode);
if( inodeNum == 0 ) {
+ LOG("Inode allocation failed");
+ LEAVE('i', -1);
return -1;
}
tVFS_Node *child = Ext2_int_CreateNode(Parent->ImplPtr, inodeNum);
if( !child ) {
Ext2_int_DereferenceInode(Parent->ImplPtr, inodeNum);
+ Log_Warning("Ext2", "Ext2_MkNod - Node creation failed");
+ LEAVE('i', -1);
return -1;
}
*/
int Ext2_Unlink(tVFS_Node *Node, const char *OldName)
{
+ Log_Warning("Ext2", "TODO: Impliment Ext2_Unlink");
return 1;
}
*/
int Ext2_Link(tVFS_Node *Node, const char *Name, tVFS_Node *Child)
{
- #if 0
+ #if 1
tExt2_Disk *disk = Node->ImplPtr;
tExt2_Inode inode;
- tExt2_DirEnt dirent;
+ tExt2_DirEnt *dirent;
tExt2_DirEnt newEntry;
- Uint64 Base; // Block's Base Address
+ Uint64 base; // Block's Base Address
int block = 0, ofs = 0;
Uint size;
void *blockData;
- int bestMatch = -1, bestSize, bestBlock, bestOfs;
+ int bestMatch = -1, bestSize, bestBlock, bestOfs, bestNeedsSplit;
int nEntries;
+
+ ENTER("pNode sName pChild",
+ Node, Name, Child);
blockData = malloc(disk->BlockSize);
// Create a stub entry
newEntry.inode = Child->Inode;
newEntry.name_len = strlen(Name);
- newEntry.rec_len = (newEntry.name_len+3+8)&~3;
+ newEntry.rec_len = ((newEntry.name_len+3)&~3) + EXT2_DIRENT_SIZE;
newEntry.type = inode.i_mode >> 12;
memcpy(newEntry.name, Name, newEntry.name_len);
size = inode.i_size;
// Get a lock on the inode
- Ext2_int_LockInode(disk, Node->Inode);
-
+ //Ext2_int_LockInode(disk, Node->Inode);
+ Mutex_Acquire(&Node->Lock);
+
+// if( !Node->Data ) {
+// }
+
// Get First Block
// - Do this ourselves as it is a simple operation
base = inode.i_block[0] * disk->BlockSize;
"Directory entry %i of inode 0x%x extends over a block boundary",
nEntries, (Uint)Node->Inode);
}
- else {
-
+ else
+ {
+ LOG("Entry %i: %x %i bytes", nEntries, dirent->type, dirent->rec_len);
// Free entry
- if(dirent->type == 0) {
+ if(dirent->type == 0)
+ {
if( dirent->rec_len >= newEntry.rec_len
&& (bestMatch == -1 || bestSize > dirent->rec_len) )
{
bestSize = dirent->rec_len;
bestBlock = block;
bestOfs = ofs;
+ bestNeedsSplit = 0;
}
}
// Non free - check name to avoid duplicates
- else {
+ else
+ {
+ LOG(" name='%.*s'", dirent->name_len, dirent->name);
if(strncmp(Name, dirent->name, dirent->name_len) == 0) {
- Ext2_int_UnlockInode(disk, Node->Inode);
+ //Ext2_int_UnlockInode(disk, Node->Inode);
+ Mutex_Release(&Node->Lock);
+ LEAVE('i', 1);
return 1; // ERR_???
}
+
+ int spare_space = dirent->rec_len - (dirent->name_len + EXT2_DIRENT_SIZE);
+ if( spare_space > newEntry.rec_len
+ && (bestMatch == -1 || bestSize > spare_space) )
+ {
+ bestMatch = nEntries;
+ bestSize = spare_space;
+ bestBlock = block;
+ bestOfs = ofs;
+ bestNeedsSplit = 1;
+ }
}
}
// Increment the pointer
nEntries ++;
ofs += dirent->rec_len;
- if( ofs >= disk->BlockSize ) {
+ size -= dirent->rec_len;
+ if( size > 0 && ofs >= disk->BlockSize ) {
// Read the next block if needed
- BLOCK_DIR_OFS(Node->Data, block) = nEntries;
+ // BLOCK_DIR_OFS(Node->Data, block) = nEntries;
block ++;
ofs = 0;
base = Ext2_int_GetBlockAddr(disk, inode.i_block, block);
}
}
+ LOG("bestMatch = %i", bestMatch);
+ // If EOF was reached with no space, check if we can fit one on the end
+ if( bestMatch < 0 && ofs + newEntry.rec_len < disk->BlockSize ) {
+ Node->Size += newEntry.rec_len;
+ Node->Flags |= VFS_FFLAG_DIRTY;
+ bestBlock = block;
+ bestOfs = ofs;
+ bestSize = newEntry.rec_len;
+ bestNeedsSplit = 0;
+ }
// Check if a free slot was found
- if( bestMatch >= 0 ) {
+ if( bestMatch >= 0 )
+ {
// Read-Modify-Write
- bestBlock = Ext2_int_GetBlockAddr(disk, inode.i_block, bestBlock);
- if( block > 0 )
- bestMatch = BLOCK_DIR_OFS(Node->Data, bestBlock);
+ base = Ext2_int_GetBlockAddr(disk, inode.i_block, bestBlock);
VFS_ReadAt( disk->FD, base, disk->BlockSize, blockData );
dirent = blockData + bestOfs;
- memcpy(dirent, newEntry, newEntry.rec_len);
+ // Shorten a pre-existing entry
+ if(bestNeedsSplit)
+ {
+ dirent->rec_len = EXT2_DIRENT_SIZE + dirent->name_len;
+ bestOfs += dirent->rec_len;
+ //bestSize -= dirent->rec_len; // (not needed, bestSize is the spare space after)
+ dirent = blockData + bestOfs;
+ }
+ // Insert new file entry
+ memcpy(dirent, &newEntry, newEntry.rec_len);
+ // Create a new blank entry
+ if( bestSize != newEntry.rec_len )
+ {
+ bestOfs += newEntry.rec_len;
+ dirent = blockData + bestOfs;
+
+ dirent->rec_len = bestSize - newEntry.rec_len;
+ dirent->type = 0;
+ }
+ // Save changes
VFS_WriteAt( disk->FD, base, disk->BlockSize, blockData );
}
else {
// Allocate block, Write
- block = Ext2_int_AllocateBlock(Disk, block);
- Log_Warning("EXT2", "");
+ Uint32 newblock = Ext2_int_AllocateBlock(disk, base / disk->BlockSize);
+ Ext2_int_AppendBlock(disk, &inode, newblock);
+ base = newblock * disk->BlockSize;
+ Node->Size += newEntry.rec_len;
+ Node->Flags |= VFS_FFLAG_DIRTY;
+ memcpy(blockData, &newEntry, newEntry.rec_len);
+ memset(blockData + newEntry.rec_len, 0, disk->BlockSize - newEntry.rec_len);
+ VFS_WriteAt( disk->FD, base, disk->BlockSize, blockData );
}
- Ext2_int_UnlockInode(disk, Node->Inode);
+ Child->ImplInt ++;
+ Child->Flags |= VFS_FFLAG_DIRTY;
+
+ //Ext2_int_UnlockInode(disk, Node->Inode);
+ Mutex_Release(&Node->Lock);
+ LEAVE('i', 0);
return 0;
#else
+ Log_Warning("Ext2", "TODO: Impliment Ext2_Link");
return 1;
#endif
}
// Save in node cache and return saved node
return Inode_CacheNode(Disk->CacheID, &retNode);
}
+
+int Ext2_int_WritebackNode(tExt2_Disk *Disk, tVFS_Node *Node)
+{
+ Log_Warning("Ext2","TODO: Impliment Ext2_int_WritebackNode");
+ return 0;
+}
+
git.ucc.asn.au / tpg / acess2.git / blobdiff
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