1 files changed, 773 insertions, 453 deletions

diff --git a/fs/jffs2/nodelist.c b/fs/jffs2/nodelist.c
index 4991c348f6ec..c79eebb8ab32 100644
--- a/fs/jffs2/nodelist.c
+++ b/fs/jffs2/nodelist.c
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: nodelist.c,v 1.98 2005/07/10 15:15:32 dedekind Exp $
+ * $Id: nodelist.c,v 1.115 2005/11/07 11:14:40 gleixner Exp $
  *
  */
 
@@ -24,469 +24,832 @@
 void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list)
 {
 	struct jffs2_full_dirent **prev = list;
-	D1(printk(KERN_DEBUG "jffs2_add_fd_to_list( %p, %p (->%p))\n", new, list, *list));
+
+	dbg_dentlist("add dirent \"%s\", ino #%u\n", new->name, new->ino);
 
 	while ((*prev) && (*prev)->nhash <= new->nhash) {
 		if ((*prev)->nhash == new->nhash && !strcmp((*prev)->name, new->name)) {
 			/* Duplicate. Free one */
 			if (new->version < (*prev)->version) {
-				D1(printk(KERN_DEBUG "Eep! Marking new dirent node obsolete\n"));
-				D1(printk(KERN_DEBUG "New dirent is \"%s\"->ino #%u. Old is \"%s\"->ino #%u\n", new->name, new->ino, (*prev)->name, (*prev)->ino));
+				dbg_dentlist("Eep! Marking new dirent node is obsolete, old is \"%s\", ino #%u\n",
+					(*prev)->name, (*prev)->ino);
 				jffs2_mark_node_obsolete(c, new->raw);
 				jffs2_free_full_dirent(new);
 			} else {
-				D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) obsolete\n", (*prev)->ino));
+				dbg_dentlist("marking old dirent \"%s\", ino #%u bsolete\n",
+					(*prev)->name, (*prev)->ino);
 				new->next = (*prev)->next;
 				jffs2_mark_node_obsolete(c, ((*prev)->raw));
 				jffs2_free_full_dirent(*prev);
 				*prev = new;
 			}
-			goto out;
+			return;
 		}
 		prev = &((*prev)->next);
 	}
 	new->next = *prev;
 	*prev = new;
+}
+
+void jffs2_truncate_fragtree(struct jffs2_sb_info *c, struct rb_root *list, uint32_t size)
+{
+	struct jffs2_node_frag *frag = jffs2_lookup_node_frag(list, size);
+
+	dbg_fragtree("truncating fragtree to 0x%08x bytes\n", size);
+
+	/* We know frag->ofs <= size. That's what lookup does for us */
+	if (frag && frag->ofs != size) {
+		if (frag->ofs+frag->size > size) {
+			frag->size = size - frag->ofs;
+		}
+		frag = frag_next(frag);
+	}
+	while (frag && frag->ofs >= size) {
+		struct jffs2_node_frag *next = frag_next(frag);
+
+		frag_erase(frag, list);
+		jffs2_obsolete_node_frag(c, frag);
+		frag = next;
+	}
 
- out:
-	D2(while(*list) {
-		printk(KERN_DEBUG "Dirent \"%s\" (hash 0x%08x, ino #%u\n", (*list)->name, (*list)->nhash, (*list)->ino);
-		list = &(*list)->next;
-	});
+	if (size == 0)
+		return;
+
+	/*
+	 * If the last fragment starts at the RAM page boundary, it is
+	 * REF_PRISTINE irrespective of its size.
+	 */
+	frag = frag_last(list);
+	if (frag->node && (frag->ofs & (PAGE_CACHE_SIZE - 1)) == 0) {
+		dbg_fragtree2("marking the last fragment 0x%08x-0x%08x REF_PRISTINE.\n",
+			frag->ofs, frag->ofs + frag->size);
+		frag->node->raw->flash_offset = ref_offset(frag->node->raw) | REF_PRISTINE;
+	}
 }
 
-/* 
- * Put a new tmp_dnode_info into the temporaty RB-tree, keeping the list in 
- * order of increasing version.
- */
-static void jffs2_add_tn_to_tree(struct jffs2_tmp_dnode_info *tn, struct rb_root *list)
+void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, struct jffs2_node_frag *this)
 {
-	struct rb_node **p = &list->rb_node;
-	struct rb_node * parent = NULL;
-	struct jffs2_tmp_dnode_info *this;
-
-	while (*p) {
-		parent = *p;
-		this = rb_entry(parent, struct jffs2_tmp_dnode_info, rb);
-
-		/* There may actually be a collision here, but it doesn't
-		   actually matter. As long as the two nodes with the same
-		   version are together, it's all fine. */
-		if (tn->version < this->version)
-			p = &(*p)->rb_left;
-		else
-			p = &(*p)->rb_right;
-        }
+	if (this->node) {
+		this->node->frags--;
+		if (!this->node->frags) {
+			/* The node has no valid frags left. It's totally obsoleted */
+			dbg_fragtree2("marking old node @0x%08x (0x%04x-0x%04x) obsolete\n",
+				ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size);
+			jffs2_mark_node_obsolete(c, this->node->raw);
+			jffs2_free_full_dnode(this->node);
+		} else {
+			dbg_fragtree2("marking old node @0x%08x (0x%04x-0x%04x) REF_NORMAL. frags is %d\n",
+				ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size, this->node->frags);
+			mark_ref_normal(this->node->raw);
+		}
 
-	rb_link_node(&tn->rb, parent, p);
-	rb_insert_color(&tn->rb, list);
+	}
+	jffs2_free_node_frag(this);
 }
 
-static void jffs2_free_tmp_dnode_info_list(struct rb_root *list)
+static void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_node_frag *base)
 {
-	struct rb_node *this;
-	struct jffs2_tmp_dnode_info *tn;
+	struct rb_node *parent = &base->rb;
+	struct rb_node **link = &parent;
 
-	this = list->rb_node;
+	dbg_fragtree2("insert frag (0x%04x-0x%04x)\n", newfrag->ofs, newfrag->ofs + newfrag->size);
 
-	/* Now at bottom of tree */
-	while (this) {
-		if (this->rb_left)
-			this = this->rb_left;
-		else if (this->rb_right)
-			this = this->rb_right;
+	while (*link) {
+		parent = *link;
+		base = rb_entry(parent, struct jffs2_node_frag, rb);
+
+		if (newfrag->ofs > base->ofs)
+			link = &base->rb.rb_right;
+		else if (newfrag->ofs < base->ofs)
+			link = &base->rb.rb_left;
 		else {
-			tn = rb_entry(this, struct jffs2_tmp_dnode_info, rb);
-			jffs2_free_full_dnode(tn->fn);
-			jffs2_free_tmp_dnode_info(tn);
-
-			this = this->rb_parent;
-			if (!this)
-				break;
-
-			if (this->rb_left == &tn->rb)
-				this->rb_left = NULL;
-			else if (this->rb_right == &tn->rb)
-				this->rb_right = NULL;
-			else BUG();
+			JFFS2_ERROR("duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base);
+			BUG();
 		}
 	}
-	list->rb_node = NULL;
+
+	rb_link_node(&newfrag->rb, &base->rb, link);
 }
 
-static void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd)
+/*
+ * Allocate and initializes a new fragment.
+ */
+static inline struct jffs2_node_frag * new_fragment(struct jffs2_full_dnode *fn, uint32_t ofs, uint32_t size)
 {
-	struct jffs2_full_dirent *next;
-
-	while (fd) {
-		next = fd->next;
-		jffs2_free_full_dirent(fd);
-		fd = next;
+	struct jffs2_node_frag *newfrag;
+
+	newfrag = jffs2_alloc_node_frag();
+	if (likely(newfrag)) {
+		newfrag->ofs = ofs;
+		newfrag->size = size;
+		newfrag->node = fn;
+	} else {
+		JFFS2_ERROR("cannot allocate a jffs2_node_frag object\n");
 	}
+
+	return newfrag;
 }
 
-/* Returns first valid node after 'ref'. May return 'ref' */
-static struct jffs2_raw_node_ref *jffs2_first_valid_node(struct jffs2_raw_node_ref *ref)
+/*
+ * Called when there is no overlapping fragment exist. Inserts a hole before the new
+ * fragment and inserts the new fragment to the fragtree.
+ */
+static int no_overlapping_node(struct jffs2_sb_info *c, struct rb_root *root,
+		 	       struct jffs2_node_frag *newfrag,
+			       struct jffs2_node_frag *this, uint32_t lastend)
 {
-	while (ref && ref->next_in_ino) {
-		if (!ref_obsolete(ref))
-			return ref;
-		D1(printk(KERN_DEBUG "node at 0x%08x is obsoleted. Ignoring.\n", ref_offset(ref)));
-		ref = ref->next_in_ino;
+	if (lastend < newfrag->node->ofs) {
+		/* put a hole in before the new fragment */
+		struct jffs2_node_frag *holefrag;
+
+		holefrag= new_fragment(NULL, lastend, newfrag->node->ofs - lastend);
+		if (unlikely(!holefrag)) {
+			jffs2_free_node_frag(newfrag);
+			return -ENOMEM;
+		}
+
+		if (this) {
+			/* By definition, the 'this' node has no right-hand child,
+			   because there are no frags with offset greater than it.
+			   So that's where we want to put the hole */
+			dbg_fragtree2("add hole frag %#04x-%#04x on the right of the new frag.\n",
+				holefrag->ofs, holefrag->ofs + holefrag->size);
+			rb_link_node(&holefrag->rb, &this->rb, &this->rb.rb_right);
+		} else {
+			dbg_fragtree2("Add hole frag %#04x-%#04x to the root of the tree.\n",
+				holefrag->ofs, holefrag->ofs + holefrag->size);
+			rb_link_node(&holefrag->rb, NULL, &root->rb_node);
+		}
+		rb_insert_color(&holefrag->rb, root);
+		this = holefrag;
+	}
+
+	if (this) {
+		/* By definition, the 'this' node has no right-hand child,
+		   because there are no frags with offset greater than it.
+		   So that's where we want to put new fragment */
+		dbg_fragtree2("add the new node at the right\n");
+		rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right);
+	} else {
+		dbg_fragtree2("insert the new node at the root of the tree\n");
+		rb_link_node(&newfrag->rb, NULL, &root->rb_node);
 	}
-	return NULL;
+	rb_insert_color(&newfrag->rb, root);
+
+	return 0;
 }
 
-/* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated
-   with this ino, returning the former in order of version */
+/* Doesn't set inode->i_size */
+static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *root, struct jffs2_node_frag *newfrag)
+{
+	struct jffs2_node_frag *this;
+	uint32_t lastend;
+
+	/* Skip all the nodes which are completed before this one starts */
+	this = jffs2_lookup_node_frag(root, newfrag->node->ofs);
+
+	if (this) {
+		dbg_fragtree2("lookup gave frag 0x%04x-0x%04x; phys 0x%08x (*%p)\n",
+			  this->ofs, this->ofs+this->size, this->node?(ref_offset(this->node->raw)):0xffffffff, this);
+		lastend = this->ofs + this->size;
+	} else {
+		dbg_fragtree2("lookup gave no frag\n");
+		lastend = 0;
+	}
+
+	/* See if we ran off the end of the fragtree */
+	if (lastend <= newfrag->ofs) {
+		/* We did */
+
+		/* Check if 'this' node was on the same page as the new node.
+		   If so, both 'this' and the new node get marked REF_NORMAL so
+		   the GC can take a look.
+		*/
+		if (lastend && (lastend-1) >> PAGE_CACHE_SHIFT == newfrag->ofs >> PAGE_CACHE_SHIFT) {
+			if (this->node)
+				mark_ref_normal(this->node->raw);
+			mark_ref_normal(newfrag->node->raw);
+		}
+
+		return no_overlapping_node(c, root, newfrag, this, lastend);
+	}
 
-int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
-			  struct rb_root *tnp, struct jffs2_full_dirent **fdp,
-			  uint32_t *highest_version, uint32_t *latest_mctime,
-			  uint32_t *mctime_ver)
+	if (this->node)
+		dbg_fragtree2("dealing with frag %u-%u, phys %#08x(%d).\n",
+		this->ofs, this->ofs + this->size,
+		ref_offset(this->node->raw), ref_flags(this->node->raw));
+	else
+		dbg_fragtree2("dealing with hole frag %u-%u.\n",
+		this->ofs, this->ofs + this->size);
+
+	/* OK. 'this' is pointing at the first frag that newfrag->ofs at least partially obsoletes,
+	 * - i.e. newfrag->ofs < this->ofs+this->size && newfrag->ofs >= this->ofs
+	 */
+	if (newfrag->ofs > this->ofs) {
+		/* This node isn't completely obsoleted. The start of it remains valid */
+
+		/* Mark the new node and the partially covered node REF_NORMAL -- let
+		   the GC take a look at them */
+		mark_ref_normal(newfrag->node->raw);
+		if (this->node)
+			mark_ref_normal(this->node->raw);
+
+		if (this->ofs + this->size > newfrag->ofs + newfrag->size) {
+			/* The new node splits 'this' frag into two */
+			struct jffs2_node_frag *newfrag2;
+
+			if (this->node)
+				dbg_fragtree2("split old frag 0x%04x-0x%04x, phys 0x%08x\n",
+					this->ofs, this->ofs+this->size, ref_offset(this->node->raw));
+			else
+				dbg_fragtree2("split old hole frag 0x%04x-0x%04x\n",
+					this->ofs, this->ofs+this->size);
+
+			/* New second frag pointing to this's node */
+			newfrag2 = new_fragment(this->node, newfrag->ofs + newfrag->size,
+						this->ofs + this->size - newfrag->ofs - newfrag->size);
+			if (unlikely(!newfrag2))
+				return -ENOMEM;
+			if (this->node)
+				this->node->frags++;
+
+			/* Adjust size of original 'this' */
+			this->size = newfrag->ofs - this->ofs;
+
+			/* Now, we know there's no node with offset
+			   greater than this->ofs but smaller than
+			   newfrag2->ofs or newfrag->ofs, for obvious
+			   reasons. So we can do a tree insert from
+			   'this' to insert newfrag, and a tree insert
+			   from newfrag to insert newfrag2. */
+			jffs2_fragtree_insert(newfrag, this);
+			rb_insert_color(&newfrag->rb, root);
+
+			jffs2_fragtree_insert(newfrag2, newfrag);
+			rb_insert_color(&newfrag2->rb, root);
+
+			return 0;
+		}
+		/* New node just reduces 'this' frag in size, doesn't split it */
+		this->size = newfrag->ofs - this->ofs;
+
+		/* Again, we know it lives down here in the tree */
+		jffs2_fragtree_insert(newfrag, this);
+		rb_insert_color(&newfrag->rb, root);
+	} else {
+		/* New frag starts at the same point as 'this' used to. Replace
+		   it in the tree without doing a delete and insertion */
+		dbg_fragtree2("inserting newfrag (*%p),%d-%d in before 'this' (*%p),%d-%d\n",
+			  newfrag, newfrag->ofs, newfrag->ofs+newfrag->size, this, this->ofs, this->ofs+this->size);
+
+		rb_replace_node(&this->rb, &newfrag->rb, root);
+
+		if (newfrag->ofs + newfrag->size >= this->ofs+this->size) {
+			dbg_fragtree2("obsoleting node frag %p (%x-%x)\n", this, this->ofs, this->ofs+this->size);
+			jffs2_obsolete_node_frag(c, this);
+		} else {
+			this->ofs += newfrag->size;
+			this->size -= newfrag->size;
+
+			jffs2_fragtree_insert(this, newfrag);
+			rb_insert_color(&this->rb, root);
+			return 0;
+		}
+	}
+	/* OK, now we have newfrag added in the correct place in the tree, but
+	   frag_next(newfrag) may be a fragment which is overlapped by it
+	*/
+	while ((this = frag_next(newfrag)) && newfrag->ofs + newfrag->size >= this->ofs + this->size) {
+		/* 'this' frag is obsoleted completely. */
+		dbg_fragtree2("obsoleting node frag %p (%x-%x) and removing from tree\n",
+			this, this->ofs, this->ofs+this->size);
+		rb_erase(&this->rb, root);
+		jffs2_obsolete_node_frag(c, this);
+	}
+	/* Now we're pointing at the first frag which isn't totally obsoleted by
+	   the new frag */
+
+	if (!this || newfrag->ofs + newfrag->size == this->ofs)
+		return 0;
+
+	/* Still some overlap but we don't need to move it in the tree */
+	this->size = (this->ofs + this->size) - (newfrag->ofs + newfrag->size);
+	this->ofs = newfrag->ofs + newfrag->size;
+
+	/* And mark them REF_NORMAL so the GC takes a look at them */
+	if (this->node)
+		mark_ref_normal(this->node->raw);
+	mark_ref_normal(newfrag->node->raw);
+
+	return 0;
+}
+
+/*
+ * Given an inode, probably with existing tree of fragments, add the new node
+ * to the fragment tree.
+ */
+int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn)
 {
-	struct jffs2_raw_node_ref *ref, *valid_ref;
-	struct jffs2_tmp_dnode_info *tn;
-	struct rb_root ret_tn = RB_ROOT;
-	struct jffs2_full_dirent *fd, *ret_fd = NULL;
-	union jffs2_node_union node;
-	size_t retlen;
-	int err;
-
-	*mctime_ver = 0;
-	
-	D1(printk(KERN_DEBUG "jffs2_get_inode_nodes(): ino #%u\n", f->inocache->ino));
+	int ret;
+	struct jffs2_node_frag *newfrag;
 
-	spin_lock(&c->erase_completion_lock);
+	if (unlikely(!fn->size))
+		return 0;
 
-	valid_ref = jffs2_first_valid_node(f->inocache->nodes);
+	newfrag = new_fragment(fn, fn->ofs, fn->size);
+	if (unlikely(!newfrag))
+		return -ENOMEM;
+	newfrag->node->frags = 1;
 
-	if (!valid_ref && (f->inocache->ino != 1))
-		printk(KERN_WARNING "Eep. No valid nodes for ino #%u\n", f->inocache->ino);
+	dbg_fragtree("adding node %#04x-%#04x @0x%08x on flash, newfrag *%p\n",
+		  fn->ofs, fn->ofs+fn->size, ref_offset(fn->raw), newfrag);
 
-	while (valid_ref) {
-		/* We can hold a pointer to a non-obsolete node without the spinlock,
-		   but _obsolete_ nodes may disappear at any time, if the block
-		   they're in gets erased. So if we mark 'ref' obsolete while we're
-		   not holding the lock, it can go away immediately. For that reason,
-		   we find the next valid node first, before processing 'ref'.
-		*/
-		ref = valid_ref;
-		valid_ref = jffs2_first_valid_node(ref->next_in_ino);
-		spin_unlock(&c->erase_completion_lock);
+	ret = jffs2_add_frag_to_fragtree(c, &f->fragtree, newfrag);
+	if (unlikely(ret))
+		return ret;
 
-		cond_resched();
+	/* If we now share a page with other nodes, mark either previous
+	   or next node REF_NORMAL, as appropriate.  */
+	if (newfrag->ofs & (PAGE_CACHE_SIZE-1)) {
+		struct jffs2_node_frag *prev = frag_prev(newfrag);
+
+		mark_ref_normal(fn->raw);
+		/* If we don't start at zero there's _always_ a previous */
+		if (prev->node)
+			mark_ref_normal(prev->node->raw);
+	}
+
+	if ((newfrag->ofs+newfrag->size) & (PAGE_CACHE_SIZE-1)) {
+		struct jffs2_node_frag *next = frag_next(newfrag);
+
+		if (next) {
+			mark_ref_normal(fn->raw);
+			if (next->node)
+				mark_ref_normal(next->node->raw);
+		}
+	}
+	jffs2_dbg_fragtree_paranoia_check_nolock(f);
+
+	return 0;
+}
+
+/*
+ * Check the data CRC of the node.
+ *
+ * Returns: 0 if the data CRC is correct;
+ * 	    1 - if incorrect;
+ *	    error code if an error occured.
+ */
+static int check_node_data(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn)
+{
+	struct jffs2_raw_node_ref *ref = tn->fn->raw;
+	int err = 0, pointed = 0;
+	struct jffs2_eraseblock *jeb;
+	unsigned char *buffer;
+	uint32_t crc, ofs, retlen, len;
+
+	BUG_ON(tn->csize == 0);
+
+	if (!jffs2_is_writebuffered(c))
+		goto adj_acc;
+
+	/* Calculate how many bytes were already checked */
+	ofs = ref_offset(ref) + sizeof(struct jffs2_raw_inode);
+	len = ofs % c->wbuf_pagesize;
+	if (likely(len))
+		len = c->wbuf_pagesize - len;
+
+	if (len >= tn->csize) {
+		dbg_readinode("no need to check node at %#08x, data length %u, data starts at %#08x - it has already been checked.\n",
+			ref_offset(ref), tn->csize, ofs);
+		goto adj_acc;
+	}
+
+	ofs += len;
+	len = tn->csize - len;
+
+	dbg_readinode("check node at %#08x, data length %u, partial CRC %#08x, correct CRC %#08x, data starts at %#08x, start checking from %#08x - %u bytes.\n",
+		ref_offset(ref), tn->csize, tn->partial_crc, tn->data_crc, ofs - len, ofs, len);
+
+#ifndef __ECOS
+	/* TODO: instead, incapsulate point() stuff to jffs2_flash_read(),
+	 * adding and jffs2_flash_read_end() interface. */
+	if (c->mtd->point) {
+		err = c->mtd->point(c->mtd, ofs, len, &retlen, &buffer);
+		if (!err && retlen < tn->csize) {
+			JFFS2_WARNING("MTD point returned len too short: %u instead of %u.\n", retlen, tn->csize);
+			c->mtd->unpoint(c->mtd, buffer, ofs, len);
+		} else if (err)
+			JFFS2_WARNING("MTD point failed: error code %d.\n", err);
+		else
+			pointed = 1; /* succefully pointed to device */
+	}
+#endif
+
+	if (!pointed) {
+		buffer = kmalloc(len, GFP_KERNEL);
+		if (unlikely(!buffer))
+			return -ENOMEM;
 
-		/* FIXME: point() */
-		err = jffs2_flash_read(c, (ref_offset(ref)), 
-				       min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node)),
-				       &retlen, (void *)&node);
+		/* TODO: this is very frequent pattern, make it a separate
+		 * routine */
+		err = jffs2_flash_read(c, ofs, len, &retlen, buffer);
 		if (err) {
-			printk(KERN_WARNING "error %d reading node at 0x%08x in get_inode_nodes()\n", err, ref_offset(ref));
+			JFFS2_ERROR("can not read %d bytes from 0x%08x, error code: %d.\n", len, ofs, err);
 			goto free_out;
 		}
-			
 
-			/* Check we've managed to read at least the common node header */
-		if (retlen < min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node.u))) {
-			printk(KERN_WARNING "short read in get_inode_nodes()\n");
+		if (retlen != len) {
+			JFFS2_ERROR("short read at %#08x: %d instead of %d.\n", ofs, retlen, len);
 			err = -EIO;
 			goto free_out;
 		}
-			
-		switch (je16_to_cpu(node.u.nodetype)) {
-		case JFFS2_NODETYPE_DIRENT:
-			D1(printk(KERN_DEBUG "Node at %08x (%d) is a dirent node\n", ref_offset(ref), ref_flags(ref)));
-			if (ref_flags(ref) == REF_UNCHECKED) {
-				printk(KERN_WARNING "BUG: Dirent node at 0x%08x never got checked? How?\n", ref_offset(ref));
-				BUG();
-			}
-			if (retlen < sizeof(node.d)) {
-				printk(KERN_WARNING "short read in get_inode_nodes()\n");
-				err = -EIO;
-				goto free_out;
-			}
-			/* sanity check */
-			if (PAD((node.d.nsize + sizeof (node.d))) != PAD(je32_to_cpu (node.d.totlen))) {
-				printk(KERN_NOTICE "jffs2_get_inode_nodes(): Illegal nsize in node at 0x%08x: nsize 0x%02x, totlen %04x\n",
-				       ref_offset(ref), node.d.nsize, je32_to_cpu(node.d.totlen));
-				jffs2_mark_node_obsolete(c, ref);
-				spin_lock(&c->erase_completion_lock);
-				continue;
-			}
-			if (je32_to_cpu(node.d.version) > *highest_version)
-				*highest_version = je32_to_cpu(node.d.version);
-			if (ref_obsolete(ref)) {
-				/* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
-				printk(KERN_ERR "Dirent node at 0x%08x became obsolete while we weren't looking\n",
-				       ref_offset(ref));
-				BUG();
-			}
-			
-			fd = jffs2_alloc_full_dirent(node.d.nsize+1);
-			if (!fd) {
-				err = -ENOMEM;
-				goto free_out;
-			}
-			fd->raw = ref;
-			fd->version = je32_to_cpu(node.d.version);
-			fd->ino = je32_to_cpu(node.d.ino);
-			fd->type = node.d.type;
-
-			/* Pick out the mctime of the latest dirent */
-			if(fd->version > *mctime_ver) {
-				*mctime_ver = fd->version;
-				*latest_mctime = je32_to_cpu(node.d.mctime);
-			}
+	}
 
-			/* memcpy as much of the name as possible from the raw
-			   dirent we've already read from the flash
-			*/
-			if (retlen > sizeof(struct jffs2_raw_dirent))
-				memcpy(&fd->name[0], &node.d.name[0], min_t(uint32_t, node.d.nsize, (retlen-sizeof(struct jffs2_raw_dirent))));
-				
-			/* Do we need to copy any more of the name directly
-			   from the flash?
-			*/
-			if (node.d.nsize + sizeof(struct jffs2_raw_dirent) > retlen) {
-				/* FIXME: point() */
-				int already = retlen - sizeof(struct jffs2_raw_dirent);
-					
-				err = jffs2_flash_read(c, (ref_offset(ref)) + retlen, 
-						   node.d.nsize - already, &retlen, &fd->name[already]);
-				if (!err && retlen != node.d.nsize - already)
-					err = -EIO;
-					
-				if (err) {
-					printk(KERN_WARNING "Read remainder of name in jffs2_get_inode_nodes(): error %d\n", err);
-					jffs2_free_full_dirent(fd);
-					goto free_out;
-				}
-			}
-			fd->nhash = full_name_hash(fd->name, node.d.nsize);
-			fd->next = NULL;
-			fd->name[node.d.nsize] = '\0';
-				/* Wheee. We now have a complete jffs2_full_dirent structure, with
-				   the name in it and everything. Link it into the list 
-				*/
-			D1(printk(KERN_DEBUG "Adding fd \"%s\", ino #%u\n", fd->name, fd->ino));
-			jffs2_add_fd_to_list(c, fd, &ret_fd);
-			break;
-
-		case JFFS2_NODETYPE_INODE:
-			D1(printk(KERN_DEBUG "Node at %08x (%d) is a data node\n", ref_offset(ref), ref_flags(ref)));
-			if (retlen < sizeof(node.i)) {
-				printk(KERN_WARNING "read too short for dnode\n");
-				err = -EIO;
-				goto free_out;
-			}
-			if (je32_to_cpu(node.i.version) > *highest_version)
-				*highest_version = je32_to_cpu(node.i.version);
-			D1(printk(KERN_DEBUG "version %d, highest_version now %d\n", je32_to_cpu(node.i.version), *highest_version));
-
-			if (ref_obsolete(ref)) {
-				/* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
-				printk(KERN_ERR "Inode node at 0x%08x became obsolete while we weren't looking\n",
-				       ref_offset(ref));
-				BUG();
-			}
+	/* Continue calculating CRC */
+	crc = crc32(tn->partial_crc, buffer, len);
+	if(!pointed)
+		kfree(buffer);
+#ifndef __ECOS
+	else
+		c->mtd->unpoint(c->mtd, buffer, ofs, len);
+#endif
 
-			/* If we've never checked the CRCs on this node, check them now. */
-			if (ref_flags(ref) == REF_UNCHECKED) {
-				uint32_t crc, len;
-				struct jffs2_eraseblock *jeb;
-
-				crc = crc32(0, &node, sizeof(node.i)-8);
-				if (crc != je32_to_cpu(node.i.node_crc)) {
-					printk(KERN_NOTICE "jffs2_get_inode_nodes(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
-					       ref_offset(ref), je32_to_cpu(node.i.node_crc), crc);
-					jffs2_mark_node_obsolete(c, ref);
-					spin_lock(&c->erase_completion_lock);
-					continue;
-				}
-				
-				/* sanity checks */
-				if ( je32_to_cpu(node.i.offset) > je32_to_cpu(node.i.isize) ||
-				     PAD(je32_to_cpu(node.i.csize) + sizeof (node.i)) != PAD(je32_to_cpu(node.i.totlen))) {
-					printk(KERN_NOTICE "jffs2_get_inode_nodes(): Inode corrupted at 0x%08x, totlen %d, #ino  %d, version %d, isize %d, csize %d, dsize %d \n",
-						ref_offset(ref),  je32_to_cpu(node.i.totlen),  je32_to_cpu(node.i.ino),
-						je32_to_cpu(node.i.version),  je32_to_cpu(node.i.isize), 
-						je32_to_cpu(node.i.csize), je32_to_cpu(node.i.dsize));
-					jffs2_mark_node_obsolete(c, ref);
-					spin_lock(&c->erase_completion_lock);
-					continue;
-				}
+	if (crc != tn->data_crc) {
+		JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n",
+			ofs, tn->data_crc, crc);
+		return 1;
+	}
 
-				if (node.i.compr != JFFS2_COMPR_ZERO && je32_to_cpu(node.i.csize)) {
-					unsigned char *buf=NULL;
-					uint32_t pointed = 0;
-#ifndef __ECOS
-					if (c->mtd->point) {
-						err = c->mtd->point (c->mtd, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize),
-								     &retlen, &buf);
-						if (!err && retlen < je32_to_cpu(node.i.csize)) {
-							D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen));
-							c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize));
-						} else if (err){
-							D1(printk(KERN_DEBUG "MTD point failed %d\n", err));
-						} else
-							pointed = 1; /* succefully pointed to device */
-					}
-#endif					
-					if(!pointed){
-						buf = kmalloc(je32_to_cpu(node.i.csize), GFP_KERNEL);
-						if (!buf)
-							return -ENOMEM;
-						
-						err = jffs2_flash_read(c, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize),
-								       &retlen, buf);
-						if (!err && retlen != je32_to_cpu(node.i.csize))
-							err = -EIO;
-						if (err) {
-							kfree(buf);
-							return err;
-						}
-					}
-					crc = crc32(0, buf, je32_to_cpu(node.i.csize));
-					if(!pointed)
-						kfree(buf);
+adj_acc:
+	jeb = &c->blocks[ref->flash_offset / c->sector_size];
+	len = ref_totlen(c, jeb, ref);
+
+	/*
+	 * Mark the node as having been checked and fix the
+	 * accounting accordingly.
+	 */
+	spin_lock(&c->erase_completion_lock);
+	jeb->used_size += len;
+	jeb->unchecked_size -= len;
+	c->used_size += len;
+	c->unchecked_size -= len;
+	spin_unlock(&c->erase_completion_lock);
+
+	return 0;
+
+free_out:
+	if(!pointed)
+		kfree(buffer);
 #ifndef __ECOS
-					else
-						c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize));
+	else
+		c->mtd->unpoint(c->mtd, buffer, ofs, len);
 #endif
+	return err;
+}
 
-					if (crc != je32_to_cpu(node.i.data_crc)) {
-						printk(KERN_NOTICE "jffs2_get_inode_nodes(): Data CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
-						       ref_offset(ref), je32_to_cpu(node.i.data_crc), crc);
-						jffs2_mark_node_obsolete(c, ref);
-						spin_lock(&c->erase_completion_lock);
-						continue;
-					}
-					
-				}
+/*
+ * Helper function for jffs2_add_older_frag_to_fragtree().
+ *
+ * Checks the node if we are in the checking stage.
+ */
+static inline int check_node(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_tmp_dnode_info *tn)
+{
+	int ret;
 
-				/* Mark the node as having been checked and fix the accounting accordingly */
-				spin_lock(&c->erase_completion_lock);
-				jeb = &c->blocks[ref->flash_offset / c->sector_size];
-				len = ref_totlen(c, jeb, ref);
-
-				jeb->used_size += len;
-				jeb->unchecked_size -= len;
-				c->used_size += len;
-				c->unchecked_size -= len;
-
-				/* If node covers at least a whole page, or if it starts at the 
-				   beginning of a page and runs to the end of the file, or if 
-				   it's a hole node, mark it REF_PRISTINE, else REF_NORMAL. 
-
-				   If it's actually overlapped, it'll get made NORMAL (or OBSOLETE) 
-				   when the overlapping node(s) get added to the tree anyway. 
-				*/
-				if ((je32_to_cpu(node.i.dsize) >= PAGE_CACHE_SIZE) ||
-				    ( ((je32_to_cpu(node.i.offset)&(PAGE_CACHE_SIZE-1))==0) &&
-				      (je32_to_cpu(node.i.dsize)+je32_to_cpu(node.i.offset) ==  je32_to_cpu(node.i.isize)))) {
-					D1(printk(KERN_DEBUG "Marking node at 0x%08x REF_PRISTINE\n", ref_offset(ref)));
-					ref->flash_offset = ref_offset(ref) | REF_PRISTINE;
-				} else {
-					D1(printk(KERN_DEBUG "Marking node at 0x%08x REF_NORMAL\n", ref_offset(ref)));
-					ref->flash_offset = ref_offset(ref) | REF_NORMAL;
-				}
-				spin_unlock(&c->erase_completion_lock);
+	BUG_ON(ref_obsolete(tn->fn->raw));
+
+	/* We only check the data CRC of unchecked nodes */
+	if (ref_flags(tn->fn->raw) != REF_UNCHECKED)
+		return 0;
+
+	dbg_fragtree2("check node %#04x-%#04x, phys offs %#08x.\n",
+		tn->fn->ofs, tn->fn->ofs + tn->fn->size, ref_offset(tn->fn->raw));
+
+	ret = check_node_data(c, tn);
+	if (unlikely(ret < 0)) {
+		JFFS2_ERROR("check_node_data() returned error: %d.\n",
+			ret);
+	} else if (unlikely(ret > 0)) {
+		dbg_fragtree2("CRC error, mark it obsolete.\n");
+		jffs2_mark_node_obsolete(c, tn->fn->raw);
+	}
+
+	return ret;
+}
+
+/*
+ * Helper function for jffs2_add_older_frag_to_fragtree().
+ *
+ * Called when the new fragment that is being inserted
+ * splits a hole fragment.
+ */
+static int split_hole(struct jffs2_sb_info *c, struct rb_root *root,
+		      struct jffs2_node_frag *newfrag, struct jffs2_node_frag *hole)
+{
+	dbg_fragtree2("fragment %#04x-%#04x splits the hole %#04x-%#04x\n",
+		newfrag->ofs, newfrag->ofs + newfrag->size, hole->ofs, hole->ofs + hole->size);
+
+	if (hole->ofs == newfrag->ofs) {
+		/*
+		 * Well, the new fragment actually starts at the same offset as
+		 * the hole.
+		 */
+		if (hole->ofs + hole->size > newfrag->ofs + newfrag->size) {
+			/*
+			 * We replace the overlapped left part of the hole by
+			 * the new node.
+			 */
+
+			dbg_fragtree2("insert fragment %#04x-%#04x and cut the left part of the hole\n",
+				newfrag->ofs, newfrag->ofs + newfrag->size);
+			rb_replace_node(&hole->rb, &newfrag->rb, root);
+
+			hole->ofs += newfrag->size;
+			hole->size -= newfrag->size;
+
+			/*
+			 * We know that 'hole' should be the right hand
+			 * fragment.
+			 */
+			jffs2_fragtree_insert(hole, newfrag);
+			rb_insert_color(&hole->rb, root);
+		} else {
+			/*
+			 * Ah, the new fragment is of the same size as the hole.
+			 * Relace the hole by it.
+			 */
+			dbg_fragtree2("insert fragment %#04x-%#04x and overwrite hole\n",
+				newfrag->ofs, newfrag->ofs + newfrag->size);
+			rb_replace_node(&hole->rb, &newfrag->rb, root);
+			jffs2_free_node_frag(hole);
+		}
+	} else {
+		/* The new fragment lefts some hole space at the left */
+
+		struct jffs2_node_frag * newfrag2 = NULL;
+
+		if (hole->ofs + hole->size > newfrag->ofs + newfrag->size) {
+			/* The new frag also lefts some space at the right */
+			newfrag2 = new_fragment(NULL, newfrag->ofs +
+				newfrag->size, hole->ofs + hole->size
+				- newfrag->ofs - newfrag->size);
+			if (unlikely(!newfrag2)) {
+				jffs2_free_node_frag(newfrag);
+				return -ENOMEM;
 			}
+		}
+
+		hole->size = newfrag->ofs - hole->ofs;
+		dbg_fragtree2("left the hole %#04x-%#04x at the left and inserd fragment %#04x-%#04x\n",
+			hole->ofs, hole->ofs + hole->size, newfrag->ofs, newfrag->ofs + newfrag->size);
+
+		jffs2_fragtree_insert(newfrag, hole);
+		rb_insert_color(&newfrag->rb, root);
+
+		if (newfrag2) {
+			dbg_fragtree2("left the hole %#04x-%#04x at the right\n",
+				newfrag2->ofs, newfrag2->ofs + newfrag2->size);
+			jffs2_fragtree_insert(newfrag2, newfrag);
+			rb_insert_color(&newfrag2->rb, root);
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * This function is used when we build inode. It expects the nodes are passed
+ * in the decreasing version order. The whole point of this is to improve the
+ * inodes checking on NAND: we check the nodes' data CRC only when they are not
+ * obsoleted. Previously, add_frag_to_fragtree() function was used and
+ * nodes were passed to it in the increasing version ordes and CRCs of all
+ * nodes were checked.
+ *
+ * Note: tn->fn->size shouldn't be zero.
+ *
+ * Returns 0 if the node was inserted
+ *         1 if it wasn't inserted (since it is obsolete)
+ *         < 0 an if error occured
+ */
+int jffs2_add_older_frag_to_fragtree(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
+				     struct jffs2_tmp_dnode_info *tn)
+{
+	struct jffs2_node_frag *this, *newfrag;
+	uint32_t lastend;
+	struct jffs2_full_dnode *fn = tn->fn;
+	struct rb_root *root = &f->fragtree;
+	uint32_t fn_size = fn->size, fn_ofs = fn->ofs;
+	int err, checked = 0;
+	int ref_flag;
+
+	dbg_fragtree("insert fragment %#04x-%#04x, ver %u\n", fn_ofs, fn_ofs + fn_size, tn->version);
+
+	/* Skip all the nodes which are completed before this one starts */
+	this = jffs2_lookup_node_frag(root, fn_ofs);
+	if (this)
+		dbg_fragtree2("'this' found %#04x-%#04x (%s)\n", this->ofs, this->ofs + this->size, this->node ? "data" : "hole");
+
+	if (this)
+		lastend = this->ofs + this->size;
+	else
+		lastend = 0;
+
+	/* Detect the preliminary type of node */
+	if (fn->size >= PAGE_CACHE_SIZE)
+		ref_flag = REF_PRISTINE;
+	else
+		ref_flag = REF_NORMAL;
+
+	/* See if we ran off the end of the root */
+	if (lastend <= fn_ofs) {
+		/* We did */
+
+		/*
+		 * We are going to insert the new node into the
+		 * fragment tree, so check it.
+		 */
+		err = check_node(c, f, tn);
+		if (err != 0)
+			return err;
+
+		fn->frags = 1;
+
+		newfrag = new_fragment(fn, fn_ofs, fn_size);
+		if (unlikely(!newfrag))
+			return -ENOMEM;
+
+		err = no_overlapping_node(c, root, newfrag, this, lastend);
+		if (unlikely(err != 0)) {
+			jffs2_free_node_frag(newfrag);
+			return err;
+		}
+
+		goto out_ok;
+	}
 
-			tn = jffs2_alloc_tmp_dnode_info();
-			if (!tn) {
-				D1(printk(KERN_DEBUG "alloc tn failed\n"));
-				err = -ENOMEM;
-				goto free_out;
+	fn->frags = 0;
+
+	while (1) {
+		/*
+		 * Here we have:
+		 * fn_ofs < this->ofs + this->size && fn_ofs >= this->ofs.
+		 *
+		 * Remember, 'this' has higher version, any non-hole node
+		 * which is already in the fragtree is newer then the newly
+		 * inserted.
+		 */
+		if (!this->node) {
+			/*
+			 * 'this' is the hole fragment, so at least the
+			 * beginning of the new fragment is valid.
+			 */
+
+			/*
+			 * We are going to insert the new node into the
+			 * fragment tree, so check it.
+			 */
+			if (!checked) {
+				err = check_node(c, f, tn);
+				if (unlikely(err != 0))
+					return err;
+				checked = 1;
 			}
 
-			tn->fn = jffs2_alloc_full_dnode();
-			if (!tn->fn) {
-				D1(printk(KERN_DEBUG "alloc fn failed\n"));
-				err = -ENOMEM;
-				jffs2_free_tmp_dnode_info(tn);
-				goto free_out;
+			if (this->ofs + this->size >= fn_ofs + fn_size) {
+				/* We split the hole on two parts */
+
+				fn->frags += 1;
+				newfrag = new_fragment(fn, fn_ofs, fn_size);
+				if (unlikely(!newfrag))
+					return -ENOMEM;
+
+				err = split_hole(c, root, newfrag, this);
+				if (unlikely(err))
+					return err;
+				goto out_ok;
 			}
-			tn->version = je32_to_cpu(node.i.version);
-			tn->fn->ofs = je32_to_cpu(node.i.offset);
-			/* There was a bug where we wrote hole nodes out with
-			   csize/dsize swapped. Deal with it */
-			if (node.i.compr == JFFS2_COMPR_ZERO && !je32_to_cpu(node.i.dsize) && je32_to_cpu(node.i.csize))
-				tn->fn->size = je32_to_cpu(node.i.csize);
-			else // normal case...
-				tn->fn->size = je32_to_cpu(node.i.dsize);
-			tn->fn->raw = ref;
-			D1(printk(KERN_DEBUG "dnode @%08x: ver %u, offset %04x, dsize %04x\n",
-				  ref_offset(ref), je32_to_cpu(node.i.version),
-				  je32_to_cpu(node.i.offset), je32_to_cpu(node.i.dsize)));
-			jffs2_add_tn_to_tree(tn, &ret_tn);
-			break;
-
-		default:
-			if (ref_flags(ref) == REF_UNCHECKED) {
-				struct jffs2_eraseblock *jeb;
-				uint32_t len;
-
-				printk(KERN_ERR "Eep. Unknown node type %04x at %08x was marked REF_UNCHECKED\n",
-				       je16_to_cpu(node.u.nodetype), ref_offset(ref));
-
-				/* Mark the node as having been checked and fix the accounting accordingly */
-				spin_lock(&c->erase_completion_lock);
-				jeb = &c->blocks[ref->flash_offset / c->sector_size];
-				len = ref_totlen(c, jeb, ref);
-
-				jeb->used_size += len;
-				jeb->unchecked_size -= len;
-				c->used_size += len;
-				c->unchecked_size -= len;
-
-				mark_ref_normal(ref);
-				spin_unlock(&c->erase_completion_lock);
+
+			/*
+			 * The beginning of the new fragment is valid since it
+			 * overlaps the hole node.
+			 */
+
+			ref_flag = REF_NORMAL;
+
+			fn->frags += 1;
+			newfrag = new_fragment(fn, fn_ofs,
+					this->ofs + this->size - fn_ofs);
+			if (unlikely(!newfrag))
+				return -ENOMEM;
+
+			if (fn_ofs == this->ofs) {
+				/*
+				 * The new node starts at the same offset as
+				 * the hole and supersieds the hole.
+				 */
+				dbg_fragtree2("add the new fragment instead of hole %#04x-%#04x, refcnt %d\n",
+					fn_ofs, fn_ofs + this->ofs + this->size - fn_ofs, fn->frags);
+
+				rb_replace_node(&this->rb, &newfrag->rb, root);
+				jffs2_free_node_frag(this);
+			} else {
+				/*
+				 * The hole becomes shorter as its right part
+				 * is supersieded by the new fragment.
+				 */
+				dbg_fragtree2("reduce size of hole %#04x-%#04x to %#04x-%#04x\n",
+					this->ofs, this->ofs + this->size, this->ofs, this->ofs + this->size - newfrag->size);
+
+				dbg_fragtree2("add new fragment %#04x-%#04x, refcnt %d\n", fn_ofs,
+					fn_ofs + this->ofs + this->size - fn_ofs, fn->frags);
+
+				this->size -= newfrag->size;
+				jffs2_fragtree_insert(newfrag, this);
+				rb_insert_color(&newfrag->rb, root);
 			}
-			node.u.nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(node.u.nodetype));
-			if (crc32(0, &node, sizeof(struct jffs2_unknown_node)-4) != je32_to_cpu(node.u.hdr_crc)) {
-				/* Hmmm. This should have been caught at scan time. */
-				printk(KERN_ERR "Node header CRC failed at %08x. But it must have been OK earlier.\n",
-				       ref_offset(ref));
-				printk(KERN_ERR "Node was: { %04x, %04x, %08x, %08x }\n", 
-				       je16_to_cpu(node.u.magic), je16_to_cpu(node.u.nodetype), je32_to_cpu(node.u.totlen),
-				       je32_to_cpu(node.u.hdr_crc));
-				jffs2_mark_node_obsolete(c, ref);
-			} else switch(je16_to_cpu(node.u.nodetype) & JFFS2_COMPAT_MASK) {
-			case JFFS2_FEATURE_INCOMPAT:
-				printk(KERN_NOTICE "Unknown INCOMPAT nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
-				/* EEP */
-				BUG();
-				break;
-			case JFFS2_FEATURE_ROCOMPAT:
-				printk(KERN_NOTICE "Unknown ROCOMPAT nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
-				if (!(c->flags & JFFS2_SB_FLAG_RO))
-					BUG();
-				break;
-			case JFFS2_FEATURE_RWCOMPAT_COPY:
-				printk(KERN_NOTICE "Unknown RWCOMPAT_COPY nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
-				break;
-			case JFFS2_FEATURE_RWCOMPAT_DELETE:
-				printk(KERN_NOTICE "Unknown RWCOMPAT_DELETE nodetype %04X at %08x\n", je16_to_cpu(node.u.nodetype), ref_offset(ref));
-				jffs2_mark_node_obsolete(c, ref);
-				break;
+
+			fn_ofs += newfrag->size;
+			fn_size -= newfrag->size;
+			this = rb_entry(rb_next(&newfrag->rb),
+					struct jffs2_node_frag, rb);
+
+			dbg_fragtree2("switch to the next 'this' fragment: %#04x-%#04x %s\n",
+				this->ofs, this->ofs + this->size, this->node ? "(data)" : "(hole)");
+		}
+
+		/*
+		 * 'This' node is not the hole so it obsoletes the new fragment
+		 * either fully or partially.
+		 */
+		if (this->ofs + this->size >= fn_ofs + fn_size) {
+			/* The new node is obsolete, drop it */
+			if (fn->frags == 0) {
+				dbg_fragtree2("%#04x-%#04x is obsolete, mark it obsolete\n", fn_ofs, fn_ofs + fn_size);
+				ref_flag = REF_OBSOLETE;
 			}
+			goto out_ok;
+		} else {
+			struct jffs2_node_frag *new_this;
+
+			/* 'This' node obsoletes the beginning of the new node */
+			dbg_fragtree2("the beginning %#04x-%#04x is obsolete\n", fn_ofs, this->ofs + this->size);
+
+			ref_flag = REF_NORMAL;
+
+			fn_size -= this->ofs + this->size - fn_ofs;
+			fn_ofs = this->ofs + this->size;
+			dbg_fragtree2("now considering %#04x-%#04x\n", fn_ofs, fn_ofs + fn_size);
+
+			new_this = rb_entry(rb_next(&this->rb), struct jffs2_node_frag, rb);
+			if (!new_this) {
+				/*
+				 * There is no next fragment. Add the rest of
+				 * the new node as the right-hand child.
+				 */
+				if (!checked) {
+					err = check_node(c, f, tn);
+					if (unlikely(err != 0))
+						return err;
+					checked = 1;
+				}
 
+				fn->frags += 1;
+				newfrag = new_fragment(fn, fn_ofs, fn_size);
+				if (unlikely(!newfrag))
+					return -ENOMEM;
+
+				dbg_fragtree2("there are no more fragments, insert %#04x-%#04x\n",
+					newfrag->ofs, newfrag->ofs + newfrag->size);
+				rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right);
+				rb_insert_color(&newfrag->rb, root);
+				goto out_ok;
+			} else {
+				this = new_this;
+				dbg_fragtree2("switch to the next 'this' fragment: %#04x-%#04x %s\n",
+					this->ofs, this->ofs + this->size, this->node ? "(data)" : "(hole)");
+			}
 		}
-		spin_lock(&c->erase_completion_lock);
+	}
+
+out_ok:
+	BUG_ON(fn->size < PAGE_CACHE_SIZE && ref_flag == REF_PRISTINE);
 
+	if (ref_flag == REF_OBSOLETE) {
+		dbg_fragtree2("the node is obsolete now\n");
+		/* jffs2_mark_node_obsolete() will adjust space accounting */
+		jffs2_mark_node_obsolete(c, fn->raw);
+		return 1;
 	}
+
+	dbg_fragtree2("the node is \"%s\" now\n", ref_flag == REF_NORMAL ? "REF_NORMAL" : "REF_PRISTINE");
+
+	/* Space accounting was adjusted at check_node_data() */
+	spin_lock(&c->erase_completion_lock);
+	fn->raw->flash_offset = ref_offset(fn->raw) | ref_flag;
 	spin_unlock(&c->erase_completion_lock);
-	*tnp = ret_tn;
-	*fdp = ret_fd;
 
 	return 0;
-
- free_out:
-	jffs2_free_tmp_dnode_info_list(&ret_tn);
-	jffs2_free_full_dirent_list(ret_fd);
-	return err;
 }
 
 void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state)
@@ -499,24 +862,21 @@ void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache
 
 /* During mount, this needs no locking. During normal operation, its
    callers want to do other stuff while still holding the inocache_lock.
-   Rather than introducing special case get_ino_cache functions or 
+   Rather than introducing special case get_ino_cache functions or
    callbacks, we just let the caller do the locking itself. */
-   
+
 struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino)
 {
 	struct jffs2_inode_cache *ret;
 
-	D2(printk(KERN_DEBUG "jffs2_get_ino_cache(): ino %u\n", ino));
-
 	ret = c->inocache_list[ino % INOCACHE_HASHSIZE];
 	while (ret && ret->ino < ino) {
 		ret = ret->next;
 	}
-	
+
 	if (ret && ret->ino != ino)
 		ret = NULL;
 
-	D2(printk(KERN_DEBUG "jffs2_get_ino_cache found %p for ino %u\n", ret, ino));
 	return ret;
 }
 
@@ -528,7 +888,7 @@ void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new
 	if (!new->ino)
 		new->ino = ++c->highest_ino;
 
-	D2(printk(KERN_DEBUG "jffs2_add_ino_cache: Add %p (ino #%u)\n", new, new->ino));
+	dbg_inocache("add %p (ino #%u)\n", new, new->ino);
 
 	prev = &c->inocache_list[new->ino % INOCACHE_HASHSIZE];
 
@@ -544,11 +904,12 @@ void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new
 void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old)
 {
 	struct jffs2_inode_cache **prev;
-	D1(printk(KERN_DEBUG "jffs2_del_ino_cache: Del %p (ino #%u)\n", old, old->ino));
+
+	dbg_inocache("del %p (ino #%u)\n", old, old->ino);
 	spin_lock(&c->inocache_lock);
-	
+
 	prev = &c->inocache_list[old->ino % INOCACHE_HASHSIZE];
-	
+
 	while ((*prev) && (*prev)->ino < old->ino) {
 		prev = &(*prev)->next;
 	}
@@ -558,7 +919,7 @@ void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old)
 
 	/* Free it now unless it's in READING or CLEARING state, which
 	   are the transitions upon read_inode() and clear_inode(). The
-	   rest of the time we know nobody else is looking at it, and 
+	   rest of the time we know nobody else is looking at it, and
 	   if it's held by read_inode() or clear_inode() they'll free it
 	   for themselves. */
 	if (old->state != INO_STATE_READING && old->state != INO_STATE_CLEARING)
@@ -571,7 +932,7 @@ void jffs2_free_ino_caches(struct jffs2_sb_info *c)
 {
 	int i;
 	struct jffs2_inode_cache *this, *next;
-	
+
 	for (i=0; i<INOCACHE_HASHSIZE; i++) {
 		this = c->inocache_list[i];
 		while (this) {
@@ -598,38 +959,30 @@ void jffs2_free_raw_node_refs(struct jffs2_sb_info *c)
 		c->blocks[i].first_node = c->blocks[i].last_node = NULL;
 	}
 }
-	
+
 struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset)
 {
-	/* The common case in lookup is that there will be a node 
+	/* The common case in lookup is that there will be a node
 	   which precisely matches. So we go looking for that first */
 	struct rb_node *next;
 	struct jffs2_node_frag *prev = NULL;
 	struct jffs2_node_frag *frag = NULL;
 
-	D2(printk(KERN_DEBUG "jffs2_lookup_node_frag(%p, %d)\n", fragtree, offset));
+	dbg_fragtree2("root %p, offset %d\n", fragtree, offset);
 
 	next = fragtree->rb_node;
 
 	while(next) {
 		frag = rb_entry(next, struct jffs2_node_frag, rb);
 
-		D2(printk(KERN_DEBUG "Considering frag %d-%d (%p). left %p, right %p\n",
-			  frag->ofs, frag->ofs+frag->size, frag, frag->rb.rb_left, frag->rb.rb_right));
 		if (frag->ofs + frag->size <= offset) {
-			D2(printk(KERN_DEBUG "Going right from frag %d-%d, before the region we care about\n",
-				  frag->ofs, frag->ofs+frag->size));
 			/* Remember the closest smaller match on the way down */
 			if (!prev || frag->ofs > prev->ofs)
 				prev = frag;
 			next = frag->rb.rb_right;
 		} else if (frag->ofs > offset) {
-			D2(printk(KERN_DEBUG "Going left from frag %d-%d, after the region we care about\n",
-				  frag->ofs, frag->ofs+frag->size));
 			next = frag->rb.rb_left;
 		} else {
-			D2(printk(KERN_DEBUG "Returning frag %d,%d, matched\n",
-				  frag->ofs, frag->ofs+frag->size));
 			return frag;
 		}
 	}
@@ -638,11 +991,11 @@ struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_
 	   and return the closest smaller one */
 
 	if (prev)
-		D2(printk(KERN_DEBUG "No match. Returning frag %d,%d, closest previous\n",
-			  prev->ofs, prev->ofs+prev->size));
-	else 
-		D2(printk(KERN_DEBUG "Returning NULL, empty fragtree\n"));
-	
+		dbg_fragtree2("no match. Returning frag %#04x-%#04x, closest previous\n",
+			  prev->ofs, prev->ofs+prev->size);
+	else
+		dbg_fragtree2("returning NULL, empty fragtree\n");
+
 	return prev;
 }
 
@@ -656,39 +1009,32 @@ void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c)
 	if (!root->rb_node)
 		return;
 
-	frag = (rb_entry(root->rb_node, struct jffs2_node_frag, rb));
+	dbg_fragtree("killing\n");
 
+	frag = (rb_entry(root->rb_node, struct jffs2_node_frag, rb));
 	while(frag) {
 		if (frag->rb.rb_left) {
-			D2(printk(KERN_DEBUG "Going left from frag (%p) %d-%d\n", 
-				  frag, frag->ofs, frag->ofs+frag->size));
 			frag = frag_left(frag);
 			continue;
 		}
 		if (frag->rb.rb_right) {
-			D2(printk(KERN_DEBUG "Going right from frag (%p) %d-%d\n", 
-				  frag, frag->ofs, frag->ofs+frag->size));
 			frag = frag_right(frag);
 			continue;
 		}
 
-		D2(printk(KERN_DEBUG "jffs2_kill_fragtree: frag at 0x%x-0x%x: node %p, frags %d--\n",
-			  frag->ofs, frag->ofs+frag->size, frag->node,
-			  frag->node?frag->node->frags:0));
-			
 		if (frag->node && !(--frag->node->frags)) {
-			/* Not a hole, and it's the final remaining frag 
+			/* Not a hole, and it's the final remaining frag
 			   of this node. Free the node */
 			if (c)
 				jffs2_mark_node_obsolete(c, frag->node->raw);
-			
+
 			jffs2_free_full_dnode(frag->node);
 		}
 		parent = frag_parent(frag);
 		if (parent) {
 			if (frag_left(parent) == frag)
 				parent->rb.rb_left = NULL;
-			else 
+			else
 				parent->rb.rb_right = NULL;
 		}
 
@@ -698,29 +1044,3 @@ void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c)
 		cond_resched();
 	}
 }
-
-void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_node_frag *base)
-{
-	struct rb_node *parent = &base->rb;
-	struct rb_node **link = &parent;
-
-	D2(printk(KERN_DEBUG "jffs2_fragtree_insert(%p; %d-%d, %p)\n", newfrag, 
-		  newfrag->ofs, newfrag->ofs+newfrag->size, base));
-
-	while (*link) {
-		parent = *link;
-		base = rb_entry(parent, struct jffs2_node_frag, rb);
-	
-		D2(printk(KERN_DEBUG "fragtree_insert considering frag at 0x%x\n", base->ofs));
-		if (newfrag->ofs > base->ofs)
-			link = &base->rb.rb_right;
-		else if (newfrag->ofs < base->ofs)
-			link = &base->rb.rb_left;
-		else {
-			printk(KERN_CRIT "Duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base);
-			BUG();
-		}
-	}
-
-	rb_link_node(&newfrag->rb, &base->rb, link);
-}