Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 755 insertions, 0 deletions

diff --git a/fs/jffs2/nodelist.c b/fs/jffs2/nodelist.c
new file mode 100644
index 000000000..b86c78d17
--- /dev/null
+++ b/fs/jffs2/nodelist.c
@@ -0,0 +1,755 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright © 2001-2007 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/mtd/mtd.h>
+#include <linux/rbtree.h>
+#include <linux/crc32.h>
+#include <linux/pagemap.h>
+#include "nodelist.h"
+
+static void jffs2_obsolete_node_frag(struct jffs2_sb_info *c,
+				     struct jffs2_node_frag *this);
+
+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;
+
+	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) {
+				dbg_dentlist("Eep! Marking new dirent node obsolete, old is \"%s\", ino #%u\n",
+					(*prev)->name, (*prev)->ino);
+				jffs2_mark_node_obsolete(c, new->raw);
+				jffs2_free_full_dirent(new);
+			} else {
+				dbg_dentlist("marking old dirent \"%s\", ino #%u obsolete\n",
+					(*prev)->name, (*prev)->ino);
+				new->next = (*prev)->next;
+				/* It may have been a 'placeholder' deletion dirent, 
+				   if jffs2_can_mark_obsolete() (see jffs2_do_unlink()) */
+				if ((*prev)->raw)
+					jffs2_mark_node_obsolete(c, ((*prev)->raw));
+				jffs2_free_full_dirent(*prev);
+				*prev = new;
+			}
+			return;
+		}
+		prev = &((*prev)->next);
+	}
+	new->next = *prev;
+	*prev = new;
+}
+
+uint32_t 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;
+	}
+
+	if (size == 0)
+		return 0;
+
+	frag = frag_last(list);
+
+	/* Sanity check for truncation to longer than we started with... */
+	if (!frag)
+		return 0;
+	if (frag->ofs + frag->size < size)
+		return frag->ofs + frag->size;
+
+	/* If the last fragment starts at the RAM page boundary, it is
+	 * REF_PRISTINE irrespective of its size. */
+	if (frag->node && (frag->ofs & (PAGE_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;
+	}
+	return size;
+}
+
+static void jffs2_obsolete_node_frag(struct jffs2_sb_info *c,
+				     struct jffs2_node_frag *this)
+{
+	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);
+		}
+
+	}
+	jffs2_free_node_frag(this);
+}
+
+static 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;
+
+	dbg_fragtree2("insert frag (0x%04x-0x%04x)\n", newfrag->ofs, newfrag->ofs + newfrag->size);
+
+	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 {
+			JFFS2_ERROR("duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base);
+			BUG();
+		}
+	}
+
+	rb_link_node(&newfrag->rb, &base->rb, link);
+}
+
+/*
+ * Allocate and initializes a new fragment.
+ */
+static struct jffs2_node_frag * new_fragment(struct jffs2_full_dnode *fn, uint32_t ofs, uint32_t size)
+{
+	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;
+}
+
+/*
+ * 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)
+{
+	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);
+	}
+	rb_insert_color(&newfrag->rb, root);
+
+	return 0;
+}
+
+/* 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_SHIFT == newfrag->ofs >> PAGE_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);
+	}
+
+	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)
+{
+	int ret;
+	struct jffs2_node_frag *newfrag;
+
+	if (unlikely(!fn->size))
+		return 0;
+
+	newfrag = new_fragment(fn, fn->ofs, fn->size);
+	if (unlikely(!newfrag))
+		return -ENOMEM;
+	newfrag->node->frags = 1;
+
+	dbg_fragtree("adding node %#04x-%#04x @0x%08x on flash, newfrag *%p\n",
+		  fn->ofs, fn->ofs+fn->size, ref_offset(fn->raw), newfrag);
+
+	ret = jffs2_add_frag_to_fragtree(c, &f->fragtree, newfrag);
+	if (unlikely(ret))
+		return ret;
+
+	/* If we now share a page with other nodes, mark either previous
+	   or next node REF_NORMAL, as appropriate.  */
+	if (newfrag->ofs & (PAGE_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_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;
+}
+
+void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state)
+{
+	spin_lock(&c->inocache_lock);
+	ic->state = state;
+	wake_up(&c->inocache_wq);
+	spin_unlock(&c->inocache_lock);
+}
+
+/* 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
+   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;
+
+	ret = c->inocache_list[ino % c->inocache_hashsize];
+	while (ret && ret->ino < ino) {
+		ret = ret->next;
+	}
+
+	if (ret && ret->ino != ino)
+		ret = NULL;
+
+	return ret;
+}
+
+void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new)
+{
+	struct jffs2_inode_cache **prev;
+
+	spin_lock(&c->inocache_lock);
+	if (!new->ino)
+		new->ino = ++c->highest_ino;
+
+	dbg_inocache("add %p (ino #%u)\n", new, new->ino);
+
+	prev = &c->inocache_list[new->ino % c->inocache_hashsize];
+
+	while ((*prev) && (*prev)->ino < new->ino) {
+		prev = &(*prev)->next;
+	}
+	new->next = *prev;
+	*prev = new;
+
+	spin_unlock(&c->inocache_lock);
+}
+
+void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old)
+{
+	struct jffs2_inode_cache **prev;
+
+#ifdef CONFIG_JFFS2_FS_XATTR
+	BUG_ON(old->xref);
+#endif
+	dbg_inocache("del %p (ino #%u)\n", old, old->ino);
+	spin_lock(&c->inocache_lock);
+
+	prev = &c->inocache_list[old->ino % c->inocache_hashsize];
+
+	while ((*prev) && (*prev)->ino < old->ino) {
+		prev = &(*prev)->next;
+	}
+	if ((*prev) == old) {
+		*prev = old->next;
+	}
+
+	/* 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
+	   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)
+		jffs2_free_inode_cache(old);
+
+	spin_unlock(&c->inocache_lock);
+}
+
+void jffs2_free_ino_caches(struct jffs2_sb_info *c)
+{
+	int i;
+	struct jffs2_inode_cache *this, *next;
+
+	for (i=0; i < c->inocache_hashsize; i++) {
+		this = c->inocache_list[i];
+		while (this) {
+			next = this->next;
+			jffs2_xattr_free_inode(c, this);
+			jffs2_free_inode_cache(this);
+			this = next;
+		}
+		c->inocache_list[i] = NULL;
+	}
+}
+
+void jffs2_free_raw_node_refs(struct jffs2_sb_info *c)
+{
+	int i;
+	struct jffs2_raw_node_ref *this, *next;
+
+	for (i=0; i<c->nr_blocks; i++) {
+		this = c->blocks[i].first_node;
+		while (this) {
+			if (this[REFS_PER_BLOCK].flash_offset == REF_LINK_NODE)
+				next = this[REFS_PER_BLOCK].next_in_ino;
+			else
+				next = NULL;
+
+			jffs2_free_refblock(this);
+			this = next;
+		}
+		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
+	   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;
+
+	dbg_fragtree2("root %p, offset %d\n", fragtree, offset);
+
+	next = fragtree->rb_node;
+
+	while(next) {
+		frag = rb_entry(next, struct jffs2_node_frag, rb);
+
+		if (frag->ofs + frag->size <= offset) {
+			/* 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) {
+			next = frag->rb.rb_left;
+		} else {
+			return frag;
+		}
+	}
+
+	/* Exact match not found. Go back up looking at each parent,
+	   and return the closest smaller one */
+
+	if (prev)
+		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;
+}
+
+/* Pass 'c' argument to indicate that nodes should be marked obsolete as
+   they're killed. */
+void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c)
+{
+	struct jffs2_node_frag *frag, *next;
+
+	dbg_fragtree("killing\n");
+	rbtree_postorder_for_each_entry_safe(frag, next, root, rb) {
+		if (frag->node && !(--frag->node->frags)) {
+			/* 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);
+		}
+
+		jffs2_free_node_frag(frag);
+		cond_resched();
+	}
+}
+
+struct jffs2_raw_node_ref *jffs2_link_node_ref(struct jffs2_sb_info *c,
+					       struct jffs2_eraseblock *jeb,
+					       uint32_t ofs, uint32_t len,
+					       struct jffs2_inode_cache *ic)
+{
+	struct jffs2_raw_node_ref *ref;
+
+	BUG_ON(!jeb->allocated_refs);
+	jeb->allocated_refs--;
+
+	ref = jeb->last_node;
+
+	dbg_noderef("Last node at %p is (%08x,%p)\n", ref, ref->flash_offset,
+		    ref->next_in_ino);
+
+	while (ref->flash_offset != REF_EMPTY_NODE) {
+		if (ref->flash_offset == REF_LINK_NODE)
+			ref = ref->next_in_ino;
+		else
+			ref++;
+	}
+
+	dbg_noderef("New ref is %p (%08x becomes %08x,%p) len 0x%x\n", ref, 
+		    ref->flash_offset, ofs, ref->next_in_ino, len);
+
+	ref->flash_offset = ofs;
+
+	if (!jeb->first_node) {
+		jeb->first_node = ref;
+		BUG_ON(ref_offset(ref) != jeb->offset);
+	} else if (unlikely(ref_offset(ref) != jeb->offset + c->sector_size - jeb->free_size)) {
+		uint32_t last_len = ref_totlen(c, jeb, jeb->last_node);
+
+		JFFS2_ERROR("Adding new ref %p at (0x%08x-0x%08x) not immediately after previous (0x%08x-0x%08x)\n",
+			    ref, ref_offset(ref), ref_offset(ref)+len,
+			    ref_offset(jeb->last_node), 
+			    ref_offset(jeb->last_node)+last_len);
+		BUG();
+	}
+	jeb->last_node = ref;
+
+	if (ic) {
+		ref->next_in_ino = ic->nodes;
+		ic->nodes = ref;
+	} else {
+		ref->next_in_ino = NULL;
+	}
+
+	switch(ref_flags(ref)) {
+	case REF_UNCHECKED:
+		c->unchecked_size += len;
+		jeb->unchecked_size += len;
+		break;
+
+	case REF_NORMAL:
+	case REF_PRISTINE:
+		c->used_size += len;
+		jeb->used_size += len;
+		break;
+
+	case REF_OBSOLETE:
+		c->dirty_size += len;
+		jeb->dirty_size += len;
+		break;
+	}
+	c->free_size -= len;
+	jeb->free_size -= len;
+
+#ifdef TEST_TOTLEN
+	/* Set (and test) __totlen field... for now */
+	ref->__totlen = len;
+	ref_totlen(c, jeb, ref);
+#endif
+	return ref;
+}
+
+/* No locking, no reservation of 'ref'. Do not use on a live file system */
+int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
+			   uint32_t size)
+{
+	if (!size)
+		return 0;
+	if (unlikely(size > jeb->free_size)) {
+		pr_crit("Dirty space 0x%x larger then free_size 0x%x (wasted 0x%x)\n",
+			size, jeb->free_size, jeb->wasted_size);
+		BUG();
+	}
+	/* REF_EMPTY_NODE is !obsolete, so that works OK */
+	if (jeb->last_node && ref_obsolete(jeb->last_node)) {
+#ifdef TEST_TOTLEN
+		jeb->last_node->__totlen += size;
+#endif
+		c->dirty_size += size;
+		c->free_size -= size;
+		jeb->dirty_size += size;
+		jeb->free_size -= size;
+	} else {
+		uint32_t ofs = jeb->offset + c->sector_size - jeb->free_size;
+		ofs |= REF_OBSOLETE;
+
+		jffs2_link_node_ref(c, jeb, ofs, size, NULL);
+	}
+
+	return 0;
+}
+
+/* Calculate totlen from surrounding nodes or eraseblock */
+static inline uint32_t __ref_totlen(struct jffs2_sb_info *c,
+				    struct jffs2_eraseblock *jeb,
+				    struct jffs2_raw_node_ref *ref)
+{
+	uint32_t ref_end;
+	struct jffs2_raw_node_ref *next_ref = ref_next(ref);
+
+	if (next_ref)
+		ref_end = ref_offset(next_ref);
+	else {
+		if (!jeb)
+			jeb = &c->blocks[ref->flash_offset / c->sector_size];
+
+		/* Last node in block. Use free_space */
+		if (unlikely(ref != jeb->last_node)) {
+			pr_crit("ref %p @0x%08x is not jeb->last_node (%p @0x%08x)\n",
+				ref, ref_offset(ref), jeb->last_node,
+				jeb->last_node ?
+				ref_offset(jeb->last_node) : 0);
+			BUG();
+		}
+		ref_end = jeb->offset + c->sector_size - jeb->free_size;
+	}
+	return ref_end - ref_offset(ref);
+}
+
+uint32_t __jffs2_ref_totlen(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
+			    struct jffs2_raw_node_ref *ref)
+{
+	uint32_t ret;
+
+	ret = __ref_totlen(c, jeb, ref);
+
+#ifdef TEST_TOTLEN
+	if (unlikely(ret != ref->__totlen)) {
+		if (!jeb)
+			jeb = &c->blocks[ref->flash_offset / c->sector_size];
+
+		pr_crit("Totlen for ref at %p (0x%08x-0x%08x) miscalculated as 0x%x instead of %x\n",
+			ref, ref_offset(ref), ref_offset(ref) + ref->__totlen,
+			ret, ref->__totlen);
+		if (ref_next(ref)) {
+			pr_crit("next %p (0x%08x-0x%08x)\n",
+				ref_next(ref), ref_offset(ref_next(ref)),
+				ref_offset(ref_next(ref)) + ref->__totlen);
+		} else 
+			pr_crit("No next ref. jeb->last_node is %p\n",
+				jeb->last_node);
+
+		pr_crit("jeb->wasted_size %x, dirty_size %x, used_size %x, free_size %x\n",
+			jeb->wasted_size, jeb->dirty_size, jeb->used_size,
+			jeb->free_size);
+
+#if defined(JFFS2_DBG_DUMPS) || defined(JFFS2_DBG_PARANOIA_CHECKS)
+		__jffs2_dbg_dump_node_refs_nolock(c, jeb);
+#endif
+
+		WARN_ON(1);
+
+		ret = ref->__totlen;
+	}
+#endif /* TEST_TOTLEN */
+	return ret;
+}