+/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
+ * All soft deleting does is increment the block's softdelete count and pulls the chunk out
+ * of the tnode.
+ * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
+ */
+
+static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
+ __u32 level, int chunkOffset)
+{
+ int i;
+ int theChunk;
+ int allDone = 1;
+ yaffs_Device *dev = in->myDev;
+
+ if (tn) {
+ if (level > 0) {
+
+ for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
+ i--) {
+ if (tn->internal[i]) {
+ allDone =
+ yaffs_SoftDeleteWorker(in,
+ tn->
+ internal[i],
+ level - 1,
+ (chunkOffset
+ <<
+ YAFFS_TNODES_INTERNAL_BITS)
+ + i);
+ if (allDone) {
+ yaffs_FreeTnode(dev,
+ tn->
+ internal[i]);
+ tn->internal[i] = NULL;
+ } else {
+ /* Hoosterman... how could this happen? */
+ }
+ }
+ }
+ return (allDone) ? 1 : 0;
+ } else if (level == 0) {
+
+ for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
+ theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+ if (theChunk) {
+ /* Note this does not find the real chunk, only the chunk group.
+ * We make an assumption that a chunk group is not larger than
+ * a block.
+ */
+ yaffs_SoftDeleteChunk(dev, theChunk);
+ yaffs_PutLevel0Tnode(dev, tn, i, 0);
+ }
+
+ }
+ return 1;
+
+ }
+
+ }
+
+ return 1;
+
+}
+
+static void yaffs_SoftDeleteFile(yaffs_Object *obj)
+{
+ if (obj->deleted &&
+ obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
+ if (obj->nDataChunks <= 0) {
+ /* Empty file with no duplicate object headers, just delete it immediately */
+ yaffs_FreeTnode(obj->myDev,
+ obj->variant.fileVariant.top);
+ obj->variant.fileVariant.top = NULL;
+ T(YAFFS_TRACE_TRACING,
+ (TSTR("yaffs: Deleting empty file %d" TENDSTR),
+ obj->objectId));
+ yaffs_DoGenericObjectDeletion(obj);
+ } else {
+ yaffs_SoftDeleteWorker(obj,
+ obj->variant.fileVariant.top,
+ obj->variant.fileVariant.
+ topLevel, 0);
+ obj->softDeleted = 1;
+ }
+ }
+}
+
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
+ *
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ */
+
+static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
+ __u32 level, int del0)
+{
+ int i;
+ int hasData;
+
+ if (tn) {
+ hasData = 0;
+
+ for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+ if (tn->internal[i] && level > 0) {
+ tn->internal[i] =
+ yaffs_PruneWorker(dev, tn->internal[i],
+ level - 1,
+ (i == 0) ? del0 : 1);
+ }
+
+ if (tn->internal[i])
+ hasData++;
+ }
+
+ if (hasData == 0 && del0) {
+ /* Free and return NULL */
+
+ yaffs_FreeTnode(dev, tn);
+ tn = NULL;
+ }
+
+ }
+
+ return tn;
+
+}
+
+static int yaffs_PruneFileStructure(yaffs_Device *dev,
+ yaffs_FileStructure *fStruct)
+{
+ int i;
+ int hasData;
+ int done = 0;
+ yaffs_Tnode *tn;
+
+ if (fStruct->topLevel > 0) {
+ fStruct->top =
+ yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
+
+ /* Now we have a tree with all the non-zero branches NULL but the height
+ * is the same as it was.
+ * Let's see if we can trim internal tnodes to shorten the tree.
+ * We can do this if only the 0th element in the tnode is in use
+ * (ie all the non-zero are NULL)
+ */
+
+ while (fStruct->topLevel && !done) {
+ tn = fStruct->top;
+
+ hasData = 0;
+ for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+ if (tn->internal[i])
+ hasData++;
+ }
+
+ if (!hasData) {
+ fStruct->top = tn->internal[0];
+ fStruct->topLevel--;
+ yaffs_FreeTnode(dev, tn);
+ } else {
+ done = 1;
+ }
+ }
+ }
+
+ return YAFFS_OK;
+}
+
+/*-------------------- End of File Structure functions.-------------------*/
+
+/* yaffs_CreateFreeObjects creates a bunch more objects and
+ * adds them to the object free list.
+ */
+static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
+{
+ int i;
+ yaffs_Object *newObjects;
+ yaffs_ObjectList *list;
+
+ if (nObjects < 1)
+ return YAFFS_OK;
+
+ /* make these things */
+ newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
+ list = YMALLOC(sizeof(yaffs_ObjectList));
+
+ if (!newObjects || !list) {
+ if (newObjects)
+ YFREE(newObjects);
+ if (list)
+ YFREE(list);
+ T(YAFFS_TRACE_ALLOCATE,
+ (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ /* Hook them into the free list */
+ for (i = 0; i < nObjects - 1; i++) {
+ newObjects[i].siblings.next =
+ (struct ylist_head *)(&newObjects[i + 1]);
+ }
+
+ newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
+ dev->freeObjects = newObjects;
+ dev->nFreeObjects += nObjects;
+ dev->nObjectsCreated += nObjects;
+
+ /* Now add this bunch of Objects to a list for freeing up. */
+
+ list->objects = newObjects;
+ list->next = dev->allocatedObjectList;
+ dev->allocatedObjectList = list;
+
+ return YAFFS_OK;
+}
+
+
+/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
+static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
+{
+ yaffs_Object *tn = NULL;
+
+#ifdef VALGRIND_TEST
+ tn = YMALLOC(sizeof(yaffs_Object));
+#else
+ /* If there are none left make more */
+ if (!dev->freeObjects)
+ yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
+
+ if (dev->freeObjects) {
+ tn = dev->freeObjects;
+ dev->freeObjects =
+ (yaffs_Object *) (dev->freeObjects->siblings.next);
+ dev->nFreeObjects--;
+ }
+#endif
+ if (tn) {
+ /* Now sweeten it up... */
+
+ memset(tn, 0, sizeof(yaffs_Object));
+ tn->beingCreated = 1;
+
+ tn->myDev = dev;
+ tn->hdrChunk = 0;
+ tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
+ YINIT_LIST_HEAD(&(tn->hardLinks));
+ YINIT_LIST_HEAD(&(tn->hashLink));
+ YINIT_LIST_HEAD(&tn->siblings);
+
+
+ /* Now make the directory sane */
+ if (dev->rootDir) {
+ tn->parent = dev->rootDir;
+ ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
+ }
+
+ /* Add it to the lost and found directory.
+ * NB Can't put root or lostNFound in lostNFound so
+ * check if lostNFound exists first
+ */
+ if (dev->lostNFoundDir)
+ yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
+
+ tn->beingCreated = 0;
+ }
+
+ dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
+
+ return tn;
+}
+
+static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
+ __u32 mode)
+{
+
+ yaffs_Object *obj =
+ yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
+ if (obj) {
+ obj->fake = 1; /* it is fake so it might have no NAND presence... */
+ obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
+ obj->unlinkAllowed = 0; /* ... or unlink it */
+ obj->deleted = 0;
+ obj->unlinked = 0;
+ obj->yst_mode = mode;
+ obj->myDev = dev;
+ obj->hdrChunk = 0; /* Not a valid chunk. */
+ }
+
+ return obj;
+
+}
+
+static void yaffs_UnhashObject(yaffs_Object *tn)
+{
+ int bucket;
+ yaffs_Device *dev = tn->myDev;
+
+ /* If it is still linked into the bucket list, free from the list */
+ if (!ylist_empty(&tn->hashLink)) {
+ ylist_del_init(&tn->hashLink);
+ bucket = yaffs_HashFunction(tn->objectId);
+ dev->objectBucket[bucket].count--;
+ }
+}
+
+/* FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_FreeObject(yaffs_Object *tn)
+{
+ yaffs_Device *dev = tn->myDev;
+
+#ifdef __KERNEL__
+ T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
+#endif
+
+ if (tn->parent)
+ YBUG();
+ if (!ylist_empty(&tn->siblings))
+ YBUG();
+
+
+#ifdef __KERNEL__
+ if (tn->myInode) {
+ /* We're still hooked up to a cached inode.
+ * Don't delete now, but mark for later deletion
+ */
+ tn->deferedFree = 1;
+ return;
+ }
+#endif
+
+ yaffs_UnhashObject(tn);
+
+#ifdef VALGRIND_TEST
+ YFREE(tn);
+#else
+ /* Link into the free list. */
+ tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
+ dev->freeObjects = tn;
+ dev->nFreeObjects++;
+#endif
+ dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
+}
+
+#ifdef __KERNEL__
+
+void yaffs_HandleDeferedFree(yaffs_Object *obj)
+{
+ if (obj->deferedFree)
+ yaffs_FreeObject(obj);
+}
+
+#endif
+
+static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
+{
+ /* Free the list of allocated Objects */
+
+ yaffs_ObjectList *tmp;
+
+ while (dev->allocatedObjectList) {
+ tmp = dev->allocatedObjectList->next;
+ YFREE(dev->allocatedObjectList->objects);
+ YFREE(dev->allocatedObjectList);
+
+ dev->allocatedObjectList = tmp;
+ }
+
+ dev->freeObjects = NULL;
+ dev->nFreeObjects = 0;
+}
+
+static void yaffs_InitialiseObjects(yaffs_Device *dev)
+{
+ int i;
+
+ dev->allocatedObjectList = NULL;
+ dev->freeObjects = NULL;
+ dev->nFreeObjects = 0;
+
+ for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+ YINIT_LIST_HEAD(&dev->objectBucket[i].list);
+ dev->objectBucket[i].count = 0;
+ }
+}
+
+static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
+{
+ static int x;
+ int i;
+ int l = 999;
+ int lowest = 999999;
+
+ /* First let's see if we can find one that's empty. */
+
+ for (i = 0; i < 10 && lowest > 0; i++) {
+ x++;
+ x %= YAFFS_NOBJECT_BUCKETS;
+ if (dev->objectBucket[x].count < lowest) {
+ lowest = dev->objectBucket[x].count;
+ l = x;
+ }
+
+ }
+
+ /* If we didn't find an empty list, then try
+ * looking a bit further for a short one
+ */
+
+ for (i = 0; i < 10 && lowest > 3; i++) {
+ x++;
+ x %= YAFFS_NOBJECT_BUCKETS;
+ if (dev->objectBucket[x].count < lowest) {
+ lowest = dev->objectBucket[x].count;
+ l = x;
+ }
+
+ }
+
+ return l;
+}
+
+static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
+{
+ int bucket = yaffs_FindNiceObjectBucket(dev);
+
+ /* Now find an object value that has not already been taken
+ * by scanning the list.
+ */
+
+ int found = 0;
+ struct ylist_head *i;
+
+ __u32 n = (__u32) bucket;
+
+ /* yaffs_CheckObjectHashSanity(); */
+
+ while (!found) {
+ found = 1;
+ n += YAFFS_NOBJECT_BUCKETS;
+ if (1 || dev->objectBucket[bucket].count > 0) {
+ ylist_for_each(i, &dev->objectBucket[bucket].list) {
+ /* If there is already one in the list */
+ if (i && ylist_entry(i, yaffs_Object,
+ hashLink)->objectId == n) {
+ found = 0;
+ }
+ }
+ }
+ }
+
+ return n;
+}
+
+static void yaffs_HashObject(yaffs_Object *in)
+{
+ int bucket = yaffs_HashFunction(in->objectId);
+ yaffs_Device *dev = in->myDev;
+
+ ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
+ dev->objectBucket[bucket].count++;
+}
+
+yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
+{
+ int bucket = yaffs_HashFunction(number);
+ struct ylist_head *i;
+ yaffs_Object *in;
+
+ ylist_for_each(i, &dev->objectBucket[bucket].list) {
+ /* Look if it is in the list */
+ if (i) {
+ in = ylist_entry(i, yaffs_Object, hashLink);
+ if (in->objectId == number) {
+#ifdef __KERNEL__
+ /* Don't tell the VFS about this one if it is defered free */
+ if (in->deferedFree)
+ return NULL;
+#endif
+
+ return in;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
+ yaffs_ObjectType type)
+{
+ yaffs_Object *theObject;
+ yaffs_Tnode *tn = NULL;
+
+ if (number < 0)
+ number = yaffs_CreateNewObjectNumber(dev);
+
+ theObject = yaffs_AllocateEmptyObject(dev);
+ if (!theObject)
+ return NULL;
+
+ if (type == YAFFS_OBJECT_TYPE_FILE) {
+ tn = yaffs_GetTnode(dev);
+ if (!tn) {
+ yaffs_FreeObject(theObject);
+ return NULL;
+ }
+ }
+
+ if (theObject) {
+ theObject->fake = 0;
+ theObject->renameAllowed = 1;
+ theObject->unlinkAllowed = 1;
+ theObject->objectId = number;
+ yaffs_HashObject(theObject);
+ theObject->variantType = type;
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_WinFileTimeNow(theObject->win_atime);
+ theObject->win_ctime[0] = theObject->win_mtime[0] =
+ theObject->win_atime[0];
+ theObject->win_ctime[1] = theObject->win_mtime[1] =
+ theObject->win_atime[1];
+
+#else
+
+ theObject->yst_atime = theObject->yst_mtime =
+ theObject->yst_ctime = Y_CURRENT_TIME;
+#endif
+ switch (type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ theObject->variant.fileVariant.fileSize = 0;
+ theObject->variant.fileVariant.scannedFileSize = 0;
+ theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
+ theObject->variant.fileVariant.topLevel = 0;
+ theObject->variant.fileVariant.top = tn;
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
+ children);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ /* No action required */
+ break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ /* todo this should not happen */
+ break;
+ }
+ }
+
+ return theObject;
+}
+
+static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
+ int number,
+ yaffs_ObjectType type)
+{
+ yaffs_Object *theObject = NULL;
+
+ if (number > 0)
+ theObject = yaffs_FindObjectByNumber(dev, number);
+
+ if (!theObject)
+ theObject = yaffs_CreateNewObject(dev, number, type);
+
+ return theObject;
+
+}
+
+
+static YCHAR *yaffs_CloneString(const YCHAR *str)
+{
+ YCHAR *newStr = NULL;
+
+ if (str && *str) {
+ newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
+ if (newStr)
+ yaffs_strcpy(newStr, str);
+ }
+
+ return newStr;
+
+}
+
+/*
+ * Mknod (create) a new object.
+ * equivalentObject only has meaning for a hard link;
+ * aliasString only has meaning for a sumlink.
+ * rdev only has meaning for devices (a subset of special objects)
+ */
+
+static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
+ yaffs_Object *parent,
+ const YCHAR *name,
+ __u32 mode,
+ __u32 uid,
+ __u32 gid,
+ yaffs_Object *equivalentObject,
+ const YCHAR *aliasString, __u32 rdev)
+{
+ yaffs_Object *in;
+ YCHAR *str = NULL;
+
+ yaffs_Device *dev = parent->myDev;
+
+ /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
+ if (yaffs_FindObjectByName(parent, name))
+ return NULL;
+
+ in = yaffs_CreateNewObject(dev, -1, type);
+
+ if (!in)
+ return YAFFS_FAIL;
+
+ if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
+ str = yaffs_CloneString(aliasString);
+ if (!str) {
+ yaffs_FreeObject(in);
+ return NULL;
+ }
+ }
+
+
+
+ if (in) {
+ in->hdrChunk = 0;
+ in->valid = 1;
+ in->variantType = type;
+
+ in->yst_mode = mode;
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_WinFileTimeNow(in->win_atime);
+ in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
+ in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
+
+#else
+ in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
+
+ in->yst_rdev = rdev;
+ in->yst_uid = uid;
+ in->yst_gid = gid;
+#endif
+ in->nDataChunks = 0;
+
+ yaffs_SetObjectName(in, name);
+ in->dirty = 1;
+
+ yaffs_AddObjectToDirectory(parent, in);
+
+ in->myDev = parent->myDev;
+
+ switch (type) {
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ in->variant.symLinkVariant.alias = str;
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ in->variant.hardLinkVariant.equivalentObject =
+ equivalentObject;
+ in->variant.hardLinkVariant.equivalentObjectId =
+ equivalentObject->objectId;
+ ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ /* do nothing */
+ break;
+ }
+
+ if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
+ /* Could not create the object header, fail the creation */
+ yaffs_DeleteObject(in);
+ in = NULL;
+ }
+
+ yaffs_UpdateParent(parent);
+ }
+
+ return in;
+}
+
+yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
+ __u32 mode, __u32 uid, __u32 gid)
+{
+ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+ uid, gid, NULL, NULL, 0);
+}
+
+yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
+ __u32 mode, __u32 uid, __u32 gid)
+{
+ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+ mode, uid, gid, NULL, NULL, 0);
+}
+
+yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
+ __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
+{
+ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+ uid, gid, NULL, NULL, rdev);
+}
+
+yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
+ __u32 mode, __u32 uid, __u32 gid,
+ const YCHAR *alias)
+{
+ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+ uid, gid, NULL, alias, 0);
+}
+
+/* yaffs_Link returns the object id of the equivalent object.*/
+yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
+ yaffs_Object *equivalentObject)
+{
+ /* Get the real object in case we were fed a hard link as an equivalent object */
+ equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
+
+ if (yaffs_MknodObject
+ (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
+ equivalentObject, NULL, 0)) {
+ return equivalentObject;
+ } else {
+ return NULL;
+ }
+
+}
+
+static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
+ const YCHAR *newName, int force, int shadows)
+{
+ int unlinkOp;
+ int deleteOp;
+
+ yaffs_Object *existingTarget;
+
+ if (newDir == NULL)
+ newDir = obj->parent; /* use the old directory */
+
+ if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
+ TENDSTR)));
+ YBUG();
+ }
+
+ /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
+ if (obj->myDev->isYaffs2)
+ unlinkOp = (newDir == obj->myDev->unlinkedDir);
+ else
+ unlinkOp = (newDir == obj->myDev->unlinkedDir
+ && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
+
+ deleteOp = (newDir == obj->myDev->deletedDir);
+
+ existingTarget = yaffs_FindObjectByName(newDir, newName);
+
+ /* If the object is a file going into the unlinked directory,
+ * then it is OK to just stuff it in since duplicate names are allowed.
+ * else only proceed if the new name does not exist and if we're putting
+ * it into a directory.
+ */
+ if ((unlinkOp ||
+ deleteOp ||
+ force ||
+ (shadows > 0) ||
+ !existingTarget) &&
+ newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
+ yaffs_SetObjectName(obj, newName);
+ obj->dirty = 1;
+
+ yaffs_AddObjectToDirectory(newDir, obj);
+
+ if (unlinkOp)
+ obj->unlinked = 1;
+
+ /* If it is a deletion then we mark it as a shrink for gc purposes. */
+ if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
+ return YAFFS_OK;
+ }
+
+ return YAFFS_FAIL;
+}
+
+int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
+ yaffs_Object *newDir, const YCHAR *newName)
+{
+ yaffs_Object *obj = NULL;
+ yaffs_Object *existingTarget = NULL;
+ int force = 0;
+
+
+ if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+ YBUG();
+ if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+ YBUG();
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+ /* Special case for case insemsitive systems (eg. WinCE).
+ * While look-up is case insensitive, the name isn't.
+ * Therefore we might want to change x.txt to X.txt
+ */
+ if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
+ force = 1;
+#endif
+
+ else if (yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
+ /* ENAMETOOLONG */
+ return YAFFS_FAIL;
+
+ obj = yaffs_FindObjectByName(oldDir, oldName);
+
+ if (obj && obj->renameAllowed) {
+
+ /* Now do the handling for an existing target, if there is one */
+
+ existingTarget = yaffs_FindObjectByName(newDir, newName);
+ if (existingTarget &&
+ existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+ !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
+ /* There is a target that is a non-empty directory, so we fail */
+ return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
+ } else if (existingTarget && existingTarget != obj) {
+ /* Nuke the target first, using shadowing,
+ * but only if it isn't the same object
+ */
+ yaffs_ChangeObjectName(obj, newDir, newName, force,
+ existingTarget->objectId);
+ yaffs_UnlinkObject(existingTarget);
+ }
+ yaffs_UpdateParent(oldDir);
+ if(newDir != oldDir)
+ yaffs_UpdateParent(newDir);
+
+ return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
+ }
+ return YAFFS_FAIL;
+}
+
+/*------------------------- Block Management and Page Allocation ----------------*/
+
+static int yaffs_InitialiseBlocks(yaffs_Device *dev)
+{
+ int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+
+ dev->blockInfo = NULL;
+ dev->chunkBits = NULL;
+
+ dev->allocationBlock = -1; /* force it to get a new one */
+
+ /* If the first allocation strategy fails, thry the alternate one */
+ dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
+ if (!dev->blockInfo) {
+ dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
+ dev->blockInfoAlt = 1;
+ } else
+ dev->blockInfoAlt = 0;
+
+ if (dev->blockInfo) {
+ /* Set up dynamic blockinfo stuff. */
+ dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
+ dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
+ if (!dev->chunkBits) {
+ dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
+ dev->chunkBitsAlt = 1;
+ } else
+ dev->chunkBitsAlt = 0;
+ }
+
+ if (dev->blockInfo && dev->chunkBits) {
+ memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
+ memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
+ return YAFFS_OK;
+ }
+
+ return YAFFS_FAIL;
+}
+
+static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
+{
+ if (dev->blockInfoAlt && dev->blockInfo)
+ YFREE_ALT(dev->blockInfo);
+ else if (dev->blockInfo)
+ YFREE(dev->blockInfo);
+
+ dev->blockInfoAlt = 0;
+
+ dev->blockInfo = NULL;
+
+ if (dev->chunkBitsAlt && dev->chunkBits)
+ YFREE_ALT(dev->chunkBits);
+ else if (dev->chunkBits)
+ YFREE(dev->chunkBits);
+ dev->chunkBitsAlt = 0;
+ dev->chunkBits = NULL;
+}
+
+static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
+ yaffs_BlockInfo *bi)
+{
+ int i;
+ __u32 seq;
+ yaffs_BlockInfo *b;
+
+ if (!dev->isYaffs2)
+ return 1; /* disqualification only applies to yaffs2. */
+
+ if (!bi->hasShrinkHeader)
+ return 1; /* can gc */
+
+ /* Find the oldest dirty sequence number if we don't know it and save it
+ * so we don't have to keep recomputing it.
+ */
+ if (!dev->oldestDirtySequence) {
+ seq = dev->sequenceNumber;
+
+ for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
+ i++) {
+ b = yaffs_GetBlockInfo(dev, i);
+ if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
+ (b->pagesInUse - b->softDeletions) <
+ dev->nChunksPerBlock && b->sequenceNumber < seq) {
+ seq = b->sequenceNumber;
+ }
+ }
+ dev->oldestDirtySequence = seq;
+ }
+
+ /* Can't do gc of this block if there are any blocks older than this one that have
+ * discarded pages.
+ */
+ return (bi->sequenceNumber <= dev->oldestDirtySequence);
+}
+
+/* FindDiretiestBlock is used to select the dirtiest block (or close enough)
+ * for garbage collection.
+ */
+
+static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
+ int aggressive)
+{
+ int b = dev->currentDirtyChecker;
+
+ int i;
+ int iterations;
+ int dirtiest = -1;
+ int pagesInUse = 0;
+ int prioritised = 0;
+ yaffs_BlockInfo *bi;
+ int pendingPrioritisedExist = 0;
+
+ /* First let's see if we need to grab a prioritised block */
+ if (dev->hasPendingPrioritisedGCs) {
+ for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
+
+ bi = yaffs_GetBlockInfo(dev, i);
+ /* yaffs_VerifyBlock(dev,bi,i); */
+
+ if (bi->gcPrioritise) {
+ pendingPrioritisedExist = 1;
+ if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+ yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
+ pagesInUse = (bi->pagesInUse - bi->softDeletions);
+ dirtiest = i;
+ prioritised = 1;
+ aggressive = 1; /* Fool the non-aggressive skip logiv below */
+ }
+ }
+ }
+
+ if (!pendingPrioritisedExist) /* None found, so we can clear this */
+ dev->hasPendingPrioritisedGCs = 0;
+ }
+
+ /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
+ * search harder.
+ * else (we're doing a leasurely gc), then we only bother to do this if the
+ * block has only a few pages in use.
+ */
+
+ dev->nonAggressiveSkip--;
+
+ if (!aggressive && (dev->nonAggressiveSkip > 0))
+ return -1;
+
+ if (!prioritised)
+ pagesInUse =
+ (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
+
+ if (aggressive)
+ iterations =
+ dev->internalEndBlock - dev->internalStartBlock + 1;
+ else {
+ iterations =
+ dev->internalEndBlock - dev->internalStartBlock + 1;
+ iterations = iterations / 16;
+ if (iterations > 200)
+ iterations = 200;
+ }
+
+ for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
+ b++;
+ if (b < dev->internalStartBlock || b > dev->internalEndBlock)
+ b = dev->internalStartBlock;
+
+ if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR("**>> Block %d is not valid" TENDSTR), b));
+ YBUG();
+ }
+
+ bi = yaffs_GetBlockInfo(dev, b);
+
+ if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+ (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
+ yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
+ dirtiest = b;
+ pagesInUse = (bi->pagesInUse - bi->softDeletions);
+ }
+ }
+
+ dev->currentDirtyChecker = b;
+
+ if (dirtiest > 0) {
+ T(YAFFS_TRACE_GC,
+ (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
+ dev->nChunksPerBlock - pagesInUse, prioritised));
+ }
+
+ dev->oldestDirtySequence = 0;
+
+ if (dirtiest > 0)
+ dev->nonAggressiveSkip = 4;
+
+ return dirtiest;
+}
+
+static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
+{
+ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
+
+ int erasedOk = 0;
+
+ /* If the block is still healthy erase it and mark as clean.
+ * If the block has had a data failure, then retire it.
+ */
+
+ T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+ (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
+ blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
+
+ bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
+
+ if (!bi->needsRetiring) {
+ yaffs_InvalidateCheckpoint(dev);
+ erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
+ if (!erasedOk) {
+ dev->nErasureFailures++;
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
+ }
+ }
+
+ if (erasedOk &&
+ ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
+ int i;
+ for (i = 0; i < dev->nChunksPerBlock; i++) {
+ if (!yaffs_CheckChunkErased
+ (dev, blockNo * dev->nChunksPerBlock + i)) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ (">>Block %d erasure supposedly OK, but chunk %d not erased"
+ TENDSTR), blockNo, i));
+ }
+ }
+ }
+
+ if (erasedOk) {
+ /* Clean it up... */
+ bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
+ dev->nErasedBlocks++;
+ bi->pagesInUse = 0;
+ bi->softDeletions = 0;
+ bi->hasShrinkHeader = 0;
+ bi->skipErasedCheck = 1; /* This is clean, so no need to check */
+ bi->gcPrioritise = 0;
+ yaffs_ClearChunkBits(dev, blockNo);
+
+ T(YAFFS_TRACE_ERASE,
+ (TSTR("Erased block %d" TENDSTR), blockNo));
+ } else {
+ dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
+
+ yaffs_RetireBlock(dev, blockNo);
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("**>> Block %d retired" TENDSTR), blockNo));
+ }
+}
+
+static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
+{
+ int i;
+
+ yaffs_BlockInfo *bi;
+
+ if (dev->nErasedBlocks < 1) {
+ /* Hoosterman we've got a problem.
+ * Can't get space to gc
+ */
+ T(YAFFS_TRACE_ERROR,
+ (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
+
+ return -1;
+ }