+static unsigned yaffs_gc_control_callback(yaffs_Device *dev)
+{
+ return yaffs_gc_control;
+}
+
+static void yaffs_GrossLock(yaffs_Device *dev)
+{
+ T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current));
+ down(&(yaffs_DeviceToContext(dev)->grossLock));
+ T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current));
+}
+
+static void yaffs_GrossUnlock(yaffs_Device *dev)
+{
+ T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current));
+ up(&(yaffs_DeviceToContext(dev)->grossLock));
+}
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+
+static struct inode *
+yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, uint32_t generation)
+{
+ return Y_IGET(sb, ino);
+}
+
+static struct dentry *
+yaffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
+{
+ return generic_fh_to_dentry(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode) ;
+}
+
+static struct dentry *
+ yaffs2_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
+{
+ return generic_fh_to_parent(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode);
+}
+
+struct dentry *yaffs2_get_parent(struct dentry *dentry)
+{
+
+ struct super_block *sb = dentry->d_inode->i_sb;
+ struct dentry *parent = ERR_PTR(-ENOENT);
+ struct inode *inode;
+ unsigned long parent_ino;
+ yaffs_Object *d_obj;
+ yaffs_Object *parent_obj;
+
+ d_obj = yaffs_InodeToObject(dentry->d_inode);
+
+ if (d_obj) {
+ parent_obj = d_obj->parent;
+ if (parent_obj) {
+ parent_ino = yaffs_GetObjectInode(parent_obj);
+ inode = Y_IGET(sb, parent_ino);
+
+ if (IS_ERR(inode)) {
+ parent = ERR_CAST(inode);
+ } else {
+ parent = d_obtain_alias(inode);
+ if (!IS_ERR(parent)) {
+ parent = ERR_PTR(-ENOMEM);
+ iput(inode);
+ }
+ }
+ }
+ }
+
+ return parent;
+}
+
+/* Just declare a zero structure as a NULL value implies
+ * using the default functions of exportfs.
+ */
+
+static struct export_operations yaffs_export_ops =
+{
+ .fh_to_dentry = yaffs2_fh_to_dentry,
+ .fh_to_parent = yaffs2_fh_to_parent,
+ .get_parent = yaffs2_get_parent,
+} ;
+
+#endif
+
+/*-----------------------------------------------------------------*/
+/* Directory search context allows us to unlock access to yaffs during
+ * filldir without causing problems with the directory being modified.
+ * This is similar to the tried and tested mechanism used in yaffs direct.
+ *
+ * A search context iterates along a doubly linked list of siblings in the
+ * directory. If the iterating object is deleted then this would corrupt
+ * the list iteration, likely causing a crash. The search context avoids
+ * this by using the removeObjectCallback to move the search context to the
+ * next object before the object is deleted.
+ *
+ * Many readdirs (and thus seach conexts) may be alive simulateously so
+ * each yaffs_Device has a list of these.
+ *
+ * A seach context lives for the duration of a readdir.
+ *
+ * All these functions must be called while yaffs is locked.
+ */
+
+struct yaffs_SearchContext {
+ yaffs_Device *dev;
+ yaffs_Object *dirObj;
+ yaffs_Object *nextReturn;
+ struct ylist_head others;
+};
+
+/*
+ * yaffs_NewSearch() creates a new search context, initialises it and
+ * adds it to the device's search context list.
+ *
+ * Called at start of readdir.
+ */
+static struct yaffs_SearchContext * yaffs_NewSearch(yaffs_Object *dir)
+{
+ yaffs_Device *dev = dir->myDev;
+ struct yaffs_SearchContext *sc = YMALLOC(sizeof(struct yaffs_SearchContext));
+ if(sc){
+ sc->dirObj = dir;
+ sc->dev = dev;
+ if( ylist_empty(&sc->dirObj->variant.directoryVariant.children))
+ sc->nextReturn = NULL;
+ else
+ sc->nextReturn = ylist_entry(
+ dir->variant.directoryVariant.children.next,
+ yaffs_Object,siblings);
+ YINIT_LIST_HEAD(&sc->others);
+ ylist_add(&sc->others,&(yaffs_DeviceToContext(dev)->searchContexts));
+ }
+ return sc;
+}
+
+/*
+ * yaffs_EndSearch() disposes of a search context and cleans up.
+ */
+static void yaffs_EndSearch(struct yaffs_SearchContext * sc)