+ cache = yaffs_FindChunkCache(in, chunk);
+
+ /* If the chunk is already in the cache or it is less than a whole chunk
+ * then use the cache (if there is caching)
+ * else bypass the cache.
+ */
+ if (cache || nToCopy != dev->nDataBytesPerChunk) {
+ if (dev->nShortOpCaches > 0) {
+
+ /* If we can't find the data in the cache, then load it up. */
+
+ if (!cache) {
+ cache = yaffs_GrabChunkCache(in->myDev);
+ cache->object = in;
+ cache->chunkId = chunk;
+ cache->dirty = 0;
+ cache->locked = 0;
+ yaffs_ReadChunkDataFromObject(in, chunk,
+ cache->
+ data);
+ cache->nBytes = 0;
+ }
+
+ yaffs_UseChunkCache(dev, cache, 0);
+
+ cache->locked = 1;
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_UnlockYAFFS(TRUE);
+#endif
+ memcpy(buffer, &cache->data[start], nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+#endif
+ cache->locked = 0;
+ } else {
+ /* Read into the local buffer then copy..*/
+
+ __u8 *localBuffer =
+ yaffs_GetTempBuffer(dev, __LINE__);
+ yaffs_ReadChunkDataFromObject(in, chunk,
+ localBuffer);
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_UnlockYAFFS(TRUE);
+#endif
+ memcpy(buffer, &localBuffer[start], nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+#endif
+ yaffs_ReleaseTempBuffer(dev, localBuffer,
+ __LINE__);
+ }
+
+ } else {
+#ifdef CONFIG_YAFFS_WINCE
+ __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+
+ /* Under WinCE can't do direct transfer. Need to use a local buffer.
+ * This is because we otherwise screw up WinCE's memory mapper
+ */
+ yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_UnlockYAFFS(TRUE);
+#endif
+ memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+ yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
+#endif
+
+#else
+ /* A full chunk. Read directly into the supplied buffer. */
+ yaffs_ReadChunkDataFromObject(in, chunk, buffer);
+#endif
+ }
+
+ n -= nToCopy;
+ offset += nToCopy;
+ buffer += nToCopy;
+ nDone += nToCopy;
+
+ }
+
+ return nDone;
+}
+
+int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
+ int nBytes, int writeThrough)
+{
+
+ int chunk;
+ int start;
+ int nToCopy;
+ int n = nBytes;
+ int nDone = 0;
+ int nToWriteBack;
+ int startOfWrite = offset;
+ int chunkWritten = 0;
+ int nBytesRead;
+
+ yaffs_Device *dev;
+
+ dev = in->myDev;
+
+ while (n > 0 && chunkWritten >= 0) {
+ //chunk = offset / dev->nDataBytesPerChunk + 1;
+ //start = offset % dev->nDataBytesPerChunk;
+ yaffs_AddrToChunk(dev,offset,&chunk,&start);
+ chunk++;
+
+ /* OK now check for the curveball where the start and end are in
+ * the same chunk.
+ */
+
+ if ((start + n) < dev->nDataBytesPerChunk) {
+ nToCopy = n;
+
+ /* Now folks, to calculate how many bytes to write back....
+ * If we're overwriting and not writing to then end of file then
+ * we need to write back as much as was there before.
+ */
+
+ nBytesRead =
+ in->variant.fileVariant.fileSize -
+ ((chunk - 1) * dev->nDataBytesPerChunk);
+
+ if (nBytesRead > dev->nDataBytesPerChunk) {
+ nBytesRead = dev->nDataBytesPerChunk;
+ }
+
+ nToWriteBack =
+ (nBytesRead >
+ (start + n)) ? nBytesRead : (start + n);
+
+ } else {
+ nToCopy = dev->nDataBytesPerChunk - start;
+ nToWriteBack = dev->nDataBytesPerChunk;
+ }
+
+ if (nToCopy != dev->nDataBytesPerChunk) {
+ /* An incomplete start or end chunk (or maybe both start and end chunk) */
+ if (dev->nShortOpCaches > 0) {
+ yaffs_ChunkCache *cache;
+ /* If we can't find the data in the cache, then load the cache */
+ cache = yaffs_FindChunkCache(in, chunk);
+
+ if (!cache
+ && yaffs_CheckSpaceForAllocation(in->
+ myDev)) {
+ cache = yaffs_GrabChunkCache(in->myDev);
+ cache->object = in;
+ cache->chunkId = chunk;
+ cache->dirty = 0;
+ cache->locked = 0;
+ yaffs_ReadChunkDataFromObject(in, chunk,
+ cache->
+ data);
+ }
+ else if(cache &&
+ !cache->dirty &&
+ !yaffs_CheckSpaceForAllocation(in->myDev)){
+ /* Drop the cache if it was a read cache item and
+ * no space check has been made for it.
+ */
+ cache = NULL;
+ }
+
+ if (cache) {
+ yaffs_UseChunkCache(dev, cache, 1);
+ cache->locked = 1;
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_UnlockYAFFS(TRUE);
+#endif
+
+ memcpy(&cache->data[start], buffer,
+ nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+#endif
+ cache->locked = 0;
+ cache->nBytes = nToWriteBack;
+
+ if (writeThrough) {
+ chunkWritten =
+ yaffs_WriteChunkDataToObject
+ (cache->object,
+ cache->chunkId,
+ cache->data, cache->nBytes,
+ 1);
+ cache->dirty = 0;
+ }
+
+ } else {
+ chunkWritten = -1; /* fail the write */
+ }
+ } else {
+ /* An incomplete start or end chunk (or maybe both start and end chunk)
+ * Read into the local buffer then copy, then copy over and write back.
+ */
+
+ __u8 *localBuffer =
+ yaffs_GetTempBuffer(dev, __LINE__);
+
+ yaffs_ReadChunkDataFromObject(in, chunk,
+ localBuffer);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_UnlockYAFFS(TRUE);
+#endif
+
+ memcpy(&localBuffer[start], buffer, nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+#endif
+ chunkWritten =
+ yaffs_WriteChunkDataToObject(in, chunk,
+ localBuffer,
+ nToWriteBack,
+ 0);
+
+ yaffs_ReleaseTempBuffer(dev, localBuffer,
+ __LINE__);
+
+ }
+
+ } else {
+
+#ifdef CONFIG_YAFFS_WINCE
+ /* Under WinCE can't do direct transfer. Need to use a local buffer.
+ * This is because we otherwise screw up WinCE's memory mapper
+ */
+ __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_UnlockYAFFS(TRUE);
+#endif
+ memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+#endif
+ chunkWritten =
+ yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
+ dev->nDataBytesPerChunk,
+ 0);
+ yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
+#else
+ /* A full chunk. Write directly from the supplied buffer. */
+ chunkWritten =
+ yaffs_WriteChunkDataToObject(in, chunk, buffer,
+ dev->nDataBytesPerChunk,
+ 0);
+#endif
+ /* Since we've overwritten the cached data, we better invalidate it. */
+ yaffs_InvalidateChunkCache(in, chunk);
+ }
+
+ if (chunkWritten >= 0) {
+ n -= nToCopy;
+ offset += nToCopy;
+ buffer += nToCopy;
+ nDone += nToCopy;
+ }
+
+ }
+
+ /* Update file object */
+
+ if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
+ in->variant.fileVariant.fileSize = (startOfWrite + nDone);
+ }
+
+ in->dirty = 1;
+
+ return nDone;
+}
+
+
+/* ---------------------- File resizing stuff ------------------ */
+
+static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
+{
+
+ yaffs_Device *dev = in->myDev;
+ int oldFileSize = in->variant.fileVariant.fileSize;
+
+ int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
+
+ int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
+ dev->nDataBytesPerChunk;
+ int i;
+ int chunkId;
+
+ /* Delete backwards so that we don't end up with holes if
+ * power is lost part-way through the operation.
+ */
+ for (i = lastDel; i >= startDel; i--) {
+ /* NB this could be optimised somewhat,
+ * eg. could retrieve the tags and write them without
+ * using yaffs_DeleteChunk
+ */
+
+ chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
+ if (chunkId > 0) {
+ if (chunkId <
+ (dev->internalStartBlock * dev->nChunksPerBlock)
+ || chunkId >=
+ ((dev->internalEndBlock +
+ 1) * dev->nChunksPerBlock)) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR("Found daft chunkId %d for %d" TENDSTR),
+ chunkId, i));
+ } else {
+ in->nDataChunks--;
+ yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
+ }
+ }
+ }
+
+}
+
+int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
+{
+
+ int oldFileSize = in->variant.fileVariant.fileSize;
+ int newSizeOfPartialChunk;
+ int newFullChunks;
+
+ yaffs_Device *dev = in->myDev;
+
+ yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
+
+ yaffs_FlushFilesChunkCache(in);
+ yaffs_InvalidateWholeChunkCache(in);
+
+ yaffs_CheckGarbageCollection(dev);
+
+ if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
+ return yaffs_GetFileSize(in);
+ }
+
+ if (newSize == oldFileSize) {
+ return oldFileSize;
+ }
+
+ if (newSize < oldFileSize) {
+
+ yaffs_PruneResizedChunks(in, newSize);
+
+ if (newSizeOfPartialChunk != 0) {
+ int lastChunk = 1 + newFullChunks;
+
+ __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+
+ /* Got to read and rewrite the last chunk with its new size and zero pad */
+ yaffs_ReadChunkDataFromObject(in, lastChunk,
+ localBuffer);
+
+ memset(localBuffer + newSizeOfPartialChunk, 0,
+ dev->nDataBytesPerChunk - newSizeOfPartialChunk);
+
+ yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
+ newSizeOfPartialChunk, 1);
+
+ yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
+ }
+
+ in->variant.fileVariant.fileSize = newSize;
+
+ yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
+ } else {
+ /* newsSize > oldFileSize */
+ in->variant.fileVariant.fileSize = newSize;
+ }
+
+
+
+ /* Write a new object header.
+ * show we've shrunk the file, if need be
+ * Do this only if the file is not in the deleted directories.
+ */
+ if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
+ in->parent->objectId != YAFFS_OBJECTID_DELETED) {
+ yaffs_UpdateObjectHeader(in, NULL, 0,
+ (newSize < oldFileSize) ? 1 : 0, 0);
+ }
+
+ return YAFFS_OK;
+}
+
+loff_t yaffs_GetFileSize(yaffs_Object * obj)
+{
+ obj = yaffs_GetEquivalentObject(obj);
+
+ switch (obj->variantType) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ return obj->variant.fileVariant.fileSize;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ return yaffs_strlen(obj->variant.symLinkVariant.alias);
+ default:
+ return 0;
+ }
+}
+
+
+
+int yaffs_FlushFile(yaffs_Object * in, int updateTime)
+{
+ int retVal;
+ if (in->dirty) {
+ yaffs_FlushFilesChunkCache(in);
+ if (updateTime) {
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_WinFileTimeNow(in->win_mtime);
+#else
+
+ in->yst_mtime = Y_CURRENT_TIME;
+
+#endif
+ }
+
+ retVal =
+ (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
+ 0) ? YAFFS_OK : YAFFS_FAIL;
+ } else {
+ retVal = YAFFS_OK;
+ }
+
+ return retVal;
+
+}
+
+static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
+{
+
+ /* First off, invalidate the file's data in the cache, without flushing. */
+ yaffs_InvalidateWholeChunkCache(in);
+
+ if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
+ /* Move to the unlinked directory so we have a record that it was deleted. */
+ yaffs_ChangeObjectName(in, in->myDev->deletedDir,"deleted", 0, 0);
+
+ }
+
+ yaffs_RemoveObjectFromDirectory(in);
+ yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
+ in->chunkId = -1;
+
+ yaffs_FreeObject(in);
+ return YAFFS_OK;
+
+}
+
+/* yaffs_DeleteFile deletes the whole file data
+ * and the inode associated with the file.
+ * It does not delete the links associated with the file.
+ */
+static int yaffs_UnlinkFile(yaffs_Object * in)
+{
+
+ int retVal;
+ int immediateDeletion = 0;
+
+ if (1) {
+#ifdef __KERNEL__
+ if (!in->myInode) {
+ immediateDeletion = 1;
+
+ }
+#else
+ if (in->inUse <= 0) {
+ immediateDeletion = 1;
+
+ }
+#endif
+ if (immediateDeletion) {
+ retVal =
+ yaffs_ChangeObjectName(in, in->myDev->deletedDir,
+ "deleted", 0, 0);
+ T(YAFFS_TRACE_TRACING,
+ (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
+ in->objectId));
+ in->deleted = 1;
+ in->myDev->nDeletedFiles++;
+ if (0 && in->myDev->isYaffs2) {
+ yaffs_ResizeFile(in, 0);
+ }
+ yaffs_SoftDeleteFile(in);
+ } else {
+ retVal =
+ yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
+ "unlinked", 0, 0);
+ }
+
+ }
+ return retVal;
+}
+
+int yaffs_DeleteFile(yaffs_Object * in)
+{
+ int retVal = YAFFS_OK;
+
+ if (in->nDataChunks > 0) {
+ /* Use soft deletion if there is data in the file */
+ if (!in->unlinked) {
+ retVal = yaffs_UnlinkFile(in);
+ }
+ if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
+ in->deleted = 1;
+ in->myDev->nDeletedFiles++;
+ yaffs_SoftDeleteFile(in);
+ }
+ return in->deleted ? YAFFS_OK : YAFFS_FAIL;
+ } else {
+ /* The file has no data chunks so we toss it immediately */
+ yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
+ in->variant.fileVariant.top = NULL;
+ yaffs_DoGenericObjectDeletion(in);
+
+ return YAFFS_OK;
+ }
+}
+
+static int yaffs_DeleteDirectory(yaffs_Object * in)
+{
+ /* First check that the directory is empty. */
+ if (list_empty(&in->variant.directoryVariant.children)) {
+ return yaffs_DoGenericObjectDeletion(in);
+ }
+
+ return YAFFS_FAIL;
+
+}
+
+static int yaffs_DeleteSymLink(yaffs_Object * in)
+{
+ YFREE(in->variant.symLinkVariant.alias);
+
+ return yaffs_DoGenericObjectDeletion(in);
+}
+
+static int yaffs_DeleteHardLink(yaffs_Object * in)
+{
+ /* remove this hardlink from the list assocaited with the equivalent
+ * object
+ */
+ list_del(&in->hardLinks);
+ return yaffs_DoGenericObjectDeletion(in);
+}
+
+static void yaffs_DestroyObject(yaffs_Object * obj)
+{
+ switch (obj->variantType) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ yaffs_DeleteFile(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ yaffs_DeleteDirectory(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ yaffs_DeleteSymLink(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ yaffs_DeleteHardLink(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ yaffs_DoGenericObjectDeletion(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ break; /* should not happen. */
+ }
+}
+
+static int yaffs_UnlinkWorker(yaffs_Object * obj)
+{
+
+ if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+ return yaffs_DeleteHardLink(obj);
+ } else if (!list_empty(&obj->hardLinks)) {
+ /* Curve ball: We're unlinking an object that has a hardlink.
+ *
+ * This problem arises because we are not strictly following
+ * The Linux link/inode model.
+ *
+ * We can't really delete the object.
+ * Instead, we do the following:
+ * - Select a hardlink.
+ * - Unhook it from the hard links
+ * - Unhook it from its parent directory (so that the rename can work)
+ * - Rename the object to the hardlink's name.
+ * - Delete the hardlink
+ */
+
+ yaffs_Object *hl;
+ int retVal;
+ YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+ hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
+
+ list_del_init(&hl->hardLinks);
+ list_del_init(&hl->siblings);
+
+ yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+
+ retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
+
+ if (retVal == YAFFS_OK) {
+ retVal = yaffs_DoGenericObjectDeletion(hl);
+ }
+ return retVal;
+
+ } else {
+ switch (obj->variantType) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ return yaffs_UnlinkFile(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ return yaffs_DeleteDirectory(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ return yaffs_DeleteSymLink(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ return yaffs_DoGenericObjectDeletion(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ default:
+ return YAFFS_FAIL;
+ }
+ }
+}
+
+
+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;
+ list_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;
+ INIT_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;
+
+}
+
+static int yaffs_Scan(yaffs_Device * dev)
+{
+ yaffs_ExtendedTags tags;
+ int blk;
+ int blockIterator;
+ int startIterator;
+ int endIterator;
+ int nBlocksToScan = 0;
+ int result;
+
+ int chunk;
+ int c;
+ int deleted;
+ yaffs_BlockState state;
+ yaffs_Object *hardList = NULL;
+ yaffs_BlockInfo *bi;
+ int sequenceNumber;
+ yaffs_ObjectHeader *oh;
+ yaffs_Object *in;
+ yaffs_Object *parent;
+ int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+
+ int alloc_failed = 0;
+
+
+ __u8 *chunkData;
+
+ yaffs_BlockIndex *blockIndex = NULL;
+
+ if (dev->isYaffs2) {
+ T(YAFFS_TRACE_SCAN,
+ (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ //TODO Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
+
+ 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;
+
+ if (dev->isYaffs2) {
+ blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
+ if(!blockIndex)
+ return YAFFS_FAIL;
+ }
+
+ /* 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;
+ } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+
+ /* Determine the highest sequence number */
+ if (dev->isYaffs2 &&
+ sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+ sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+
+ blockIndex[nBlocksToScan].seq = sequenceNumber;
+ blockIndex[nBlocksToScan].block = blk;
+
+ nBlocksToScan++;
+
+ if (sequenceNumber >= dev->sequenceNumber) {
+ dev->sequenceNumber = sequenceNumber;
+ }
+ } else if (dev->isYaffs2) {
+ /* TODO: Nasty sequence number! */
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ ("Block scanning block %d has bad sequence number %d"
+ TENDSTR), blk, sequenceNumber));
+
+ }
+ }