+static int yaffs_UnlinkObject( yaffs_Object *obj)
+{
+
+ if (obj && obj->unlinkAllowed) {
+ return yaffs_UnlinkWorker(obj);
+ }
+
+ return YAFFS_FAIL;
+
+}
+int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
+{
+ yaffs_Object *obj;
+
+ obj = yaffs_FindObjectByName(dir, name);
+ return yaffs_UnlinkObject(obj);
+}
+
+/*----------------------- Initialisation Scanning ---------------------- */
+
+static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
+ int backwardScanning)
+{
+ yaffs_Object *obj;
+
+ if (!backwardScanning) {
+ /* Handle YAFFS1 forward scanning case
+ * For YAFFS1 we always do the deletion
+ */
+
+ } else {
+ /* Handle YAFFS2 case (backward scanning)
+ * If the shadowed object exists then ignore.
+ */
+ if (yaffs_FindObjectByNumber(dev, objId)) {
+ return;
+ }
+ }
+
+ /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
+ * We put it in unlinked dir to be cleaned up after the scanning
+ */
+ obj =
+ yaffs_FindOrCreateObjectByNumber(dev, objId,
+ YAFFS_OBJECT_TYPE_FILE);
+ yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
+ obj->variant.fileVariant.shrinkSize = 0;
+ obj->valid = 1; /* So that we don't read any other info for this file */
+
+}
+
+typedef struct {
+ int seq;
+ int block;
+} yaffs_BlockIndex;
+
+
+static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
+{
+ yaffs_Object *hl;
+ yaffs_Object *in;
+
+ while (hardList) {
+ hl = hardList;
+ hardList = (yaffs_Object *) (hardList->hardLinks.next);
+
+ in = yaffs_FindObjectByNumber(dev,
+ hl->variant.hardLinkVariant.
+ equivalentObjectId);
+
+ if (in) {
+ /* Add the hardlink pointers */
+ hl->variant.hardLinkVariant.equivalentObject = in;
+ ylist_add(&hl->hardLinks, &in->hardLinks);
+ } else {
+ /* Todo Need to report/handle this better.
+ * Got a problem... hardlink to a non-existant object
+ */
+ hl->variant.hardLinkVariant.equivalentObject = NULL;
+ YINIT_LIST_HEAD(&hl->hardLinks);
+
+ }
+
+ }
+
+}
+
+
+
+
+
+static int ybicmp(const void *a, const void *b){
+ register int aseq = ((yaffs_BlockIndex *)a)->seq;
+ register int bseq = ((yaffs_BlockIndex *)b)->seq;
+ register int ablock = ((yaffs_BlockIndex *)a)->block;
+ register int bblock = ((yaffs_BlockIndex *)b)->block;
+ if( aseq == bseq )
+ return ablock - bblock;
+ else
+ return aseq - bseq;
+
+}
+
+
+struct yaffs_ShadowFixerStruct {
+ int objectId;
+ int shadowedId;
+ struct yaffs_ShadowFixerStruct *next;
+};
+
+static int yaffs_Scan(yaffs_Device * dev)
+{
+ yaffs_ExtendedTags tags;
+ int blk;
+ int blockIterator;
+ int startIterator;
+ int endIterator;
+ int result;
+
+ int chunk;
+ int c;
+ int deleted;
+ yaffs_BlockState state;
+ yaffs_Object *hardList = NULL;
+ yaffs_BlockInfo *bi;
+ __u32 sequenceNumber;
+ yaffs_ObjectHeader *oh;
+ yaffs_Object *in;
+ yaffs_Object *parent;
+
+ int alloc_failed = 0;
+
+ struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
+
+
+ __u8 *chunkData;
+
+
+
+ T(YAFFS_TRACE_SCAN,
+ (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
+ dev->internalStartBlock, dev->internalEndBlock));
+
+ chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+ dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+ /* Scan all the blocks to determine their state */
+ for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
+ bi = yaffs_GetBlockInfo(dev, blk);
+ yaffs_ClearChunkBits(dev, blk);
+ bi->pagesInUse = 0;
+ bi->softDeletions = 0;
+
+ yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
+
+ bi->blockState = state;
+ bi->sequenceNumber = sequenceNumber;
+
+ T(YAFFS_TRACE_SCAN_DEBUG,
+ (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
+ state, sequenceNumber));
+
+ if (state == YAFFS_BLOCK_STATE_DEAD) {
+ T(YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("block %d is bad" TENDSTR), blk));
+ } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+ T(YAFFS_TRACE_SCAN_DEBUG,
+ (TSTR("Block empty " TENDSTR)));
+ dev->nErasedBlocks++;
+ dev->nFreeChunks += dev->nChunksPerBlock;
+ }
+ }
+
+ startIterator = dev->internalStartBlock;
+ endIterator = dev->internalEndBlock;
+
+ /* For each block.... */
+ for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
+ blockIterator++) {
+
+ YYIELD();
+
+ YYIELD();
+
+ blk = blockIterator;
+
+ bi = yaffs_GetBlockInfo(dev, blk);
+ state = bi->blockState;
+
+ deleted = 0;
+
+ /* For each chunk in each block that needs scanning....*/
+ for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
+ state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
+ /* Read the tags and decide what to do */
+ chunk = blk * dev->nChunksPerBlock + c;
+
+ result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
+ &tags);
+
+ /* Let's have a good look at this chunk... */
+
+ if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
+ /* YAFFS1 only...
+ * A deleted chunk
+ */
+ deleted++;
+ dev->nFreeChunks++;
+ /*T((" %d %d deleted\n",blk,c)); */
+ } else if (!tags.chunkUsed) {
+ /* An unassigned chunk in the block
+ * This means that either the block is empty or
+ * this is the one being allocated from
+ */
+
+ if (c == 0) {
+ /* We're looking at the first chunk in the block so the block is unused */
+ state = YAFFS_BLOCK_STATE_EMPTY;
+ dev->nErasedBlocks++;
+ } else {
+ /* this is the block being allocated from */
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ (" Allocating from %d %d" TENDSTR),
+ blk, c));
+ state = YAFFS_BLOCK_STATE_ALLOCATING;
+ dev->allocationBlock = blk;
+ dev->allocationPage = c;
+ dev->allocationBlockFinder = blk;
+ /* Set it to here to encourage the allocator to go forth from here. */
+
+ }
+
+ dev->nFreeChunks += (dev->nChunksPerBlock - c);
+ } else if (tags.chunkId > 0) {
+ /* chunkId > 0 so it is a data chunk... */
+ unsigned int endpos;
+
+ yaffs_SetChunkBit(dev, blk, c);
+ bi->pagesInUse++;
+
+ in = yaffs_FindOrCreateObjectByNumber(dev,
+ tags.
+ objectId,
+ YAFFS_OBJECT_TYPE_FILE);
+ /* PutChunkIntoFile checks for a clash (two data chunks with
+ * the same chunkId).
+ */
+
+ if(!in)
+ alloc_failed = 1;
+
+ if(in){
+ if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
+ alloc_failed = 1;
+ }
+
+ endpos =
+ (tags.chunkId - 1) * dev->nDataBytesPerChunk +
+ tags.byteCount;
+ if (in &&
+ in->variantType == YAFFS_OBJECT_TYPE_FILE
+ && in->variant.fileVariant.scannedFileSize <
+ endpos) {
+ in->variant.fileVariant.
+ scannedFileSize = endpos;
+ if (!dev->useHeaderFileSize) {
+ in->variant.fileVariant.
+ fileSize =
+ in->variant.fileVariant.
+ scannedFileSize;
+ }
+
+ }
+ /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
+ } else {
+ /* chunkId == 0, so it is an ObjectHeader.
+ * Thus, we read in the object header and make the object
+ */
+ yaffs_SetChunkBit(dev, blk, c);
+ bi->pagesInUse++;