diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 96ab279..f8fccda 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1590,6 +1590,8 @@
 			struct btrfs_root *root, struct btrfs_path *path,
 			u64 isize);
 /* inode.c */
+int btrfs_writepages(struct address_space *mapping,
+		     struct writeback_control *wbc);
 int btrfs_create_subvol_root(struct btrfs_root *new_root,
 		struct btrfs_trans_handle *trans, u64 new_dirid,
 		struct btrfs_block_group_cache *block_group);
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 7380449..99659937 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -97,7 +97,6 @@
 	spin_lock_init(&tree->lock);
 	spin_lock_init(&tree->buffer_lock);
 	tree->mapping = mapping;
-	tree->last = NULL;
 }
 EXPORT_SYMBOL(extent_io_tree_init);
 
@@ -173,12 +172,6 @@
 	struct tree_entry *entry;
 	struct tree_entry *prev_entry = NULL;
 
-	if (tree->last) {
-		struct extent_state *state;
-		state = tree->last;
-		if (state->start <= offset && offset <= state->end)
-			return &tree->last->rb_node;
-	}
 	while(n) {
 		entry = rb_entry(n, struct tree_entry, rb_node);
 		prev = n;
@@ -189,7 +182,6 @@
 		else if (offset > entry->end)
 			n = n->rb_right;
 		else {
-			tree->last = rb_entry(n, struct extent_state, rb_node);
 			return n;
 		}
 	}
@@ -223,10 +215,6 @@
 
 	ret = __etree_search(tree, offset, &prev, NULL);
 	if (!ret) {
-		if (prev) {
-			tree->last = rb_entry(prev, struct extent_state,
-					      rb_node);
-		}
 		return prev;
 	}
 	return ret;
@@ -301,8 +289,6 @@
 		    other->state == state->state) {
 			state->start = other->start;
 			other->tree = NULL;
-			if (tree->last == other)
-				tree->last = state;
 			rb_erase(&other->rb_node, &tree->state);
 			free_extent_state(other);
 		}
@@ -314,8 +300,6 @@
 		    other->state == state->state) {
 			other->start = state->start;
 			state->tree = NULL;
-			if (tree->last == state)
-				tree->last = other;
 			rb_erase(&state->rb_node, &tree->state);
 			free_extent_state(state);
 		}
@@ -378,7 +362,6 @@
 		return -EEXIST;
 	}
 	state->tree = tree;
-	tree->last = state;
 	merge_state(tree, state);
 	return 0;
 }
@@ -444,9 +427,6 @@
 	if (delete || state->state == 0) {
 		if (state->tree) {
 			clear_state_cb(tree, state, state->state);
-			if (tree->last == state) {
-				tree->last = extent_state_next(state);
-			}
 			rb_erase(&state->rb_node, &tree->state);
 			state->tree = NULL;
 			free_extent_state(state);
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 6c03e6a..315cfce 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -60,7 +60,6 @@
 	spinlock_t lock;
 	spinlock_t buffer_lock;
 	struct extent_io_ops *ops;
-	struct extent_state *last;
 };
 
 struct extent_state {
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 71b1ac1..8a502ee 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -42,7 +42,6 @@
 void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask)
 {
 	tree->map.rb_node = NULL;
-	tree->last = NULL;
 	spin_lock_init(&tree->lock);
 }
 EXPORT_SYMBOL(extent_map_tree_init);
@@ -239,7 +238,6 @@
 		merge->in_tree = 0;
 		free_extent_map(merge);
 	}
-	tree->last = em;
 out:
 	return ret;
 }
@@ -273,10 +271,6 @@
 	u64 end = range_end(start, len);
 
 	BUG_ON(spin_trylock(&tree->lock));
-	em = tree->last;
-	if (em && end > em->start && start < extent_map_end(em))
-		goto found;
-
 	rb_node = __tree_search(&tree->map, start, &prev, &next);
 	if (!rb_node && prev) {
 		em = rb_entry(prev, struct extent_map, rb_node);
@@ -305,7 +299,6 @@
 
 found:
 	atomic_inc(&em->refs);
-	tree->last = em;
 out:
 	return em;
 }
@@ -327,8 +320,6 @@
 	BUG_ON(spin_trylock(&tree->lock));
 	rb_erase(&em->rb_node, &tree->map);
 	em->in_tree = 0;
-	if (tree->last == em)
-		tree->last = NULL;
 	return ret;
 }
 EXPORT_SYMBOL(remove_extent_mapping);
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index a3978ec..26ac6fe 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -26,7 +26,6 @@
 
 struct extent_map_tree {
 	struct rb_root map;
-	struct extent_map *last;
 	spinlock_t lock;
 };
 
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 591a302..e5ffb66 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -381,14 +381,13 @@
 			break;
 		}
 		if (test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
-			start = em->start + em->len;
-			free_extent_map(em);
-			spin_unlock(&em_tree->lock);
-			if (start < end) {
-				len = end - start + 1;
-				continue;
-			}
-			break;
+			printk(KERN_CRIT "inode %lu trying to drop pinned "
+			       "extent start %llu end %llu, em [%llu %llu]\n",
+			       inode->i_ino,
+			       (unsigned long long)start,
+			       (unsigned long long)end,
+			       (unsigned long long)em->start,
+			       (unsigned long long)em->len);
 		}
 		remove_extent_mapping(em_tree, em);
 
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 60852ad..3da12a4 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -485,7 +485,7 @@
 	fixup = kzalloc(sizeof(*fixup), GFP_NOFS);
 	if (!fixup)
 		return -EAGAIN;
-printk("queueing worker to fixup page %lu %Lu\n", inode->i_ino, page_offset(page));
+
 	SetPageChecked(page);
 	page_cache_get(page);
 	fixup->work.func = btrfs_writepage_fixup_worker;
@@ -502,11 +502,13 @@
 	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
 	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
 	struct extent_map *em;
+	struct extent_map *em_orig;
 	u64 alloc_hint = 0;
 	u64 clear_start;
 	u64 clear_end;
 	struct list_head list;
 	struct btrfs_key ins;
+	struct rb_node *rb;
 	int ret;
 
 	ret = btrfs_dec_test_ordered_pending(inode, start, end - start + 1);
@@ -535,6 +537,22 @@
 
 	mutex_lock(&BTRFS_I(inode)->extent_mutex);
 
+	spin_lock(&em_tree->lock);
+	clear_start = ordered_extent->file_offset;
+	clear_end = ordered_extent->file_offset + ordered_extent->len;
+	em = lookup_extent_mapping(em_tree, clear_start,
+				   ordered_extent->len);
+	em_orig = em;
+	while(em && clear_start < extent_map_end(em) && clear_end > em->start) {
+		clear_bit(EXTENT_FLAG_PINNED, &em->flags);
+		rb = rb_next(&em->rb_node);
+		if (!rb)
+			break;
+		em = rb_entry(rb, struct extent_map, rb_node);
+	}
+	free_extent_map(em_orig);
+	spin_unlock(&em_tree->lock);
+
 	ret = btrfs_drop_extents(trans, root, inode,
 				 ordered_extent->file_offset,
 				 ordered_extent->file_offset +
@@ -548,22 +566,6 @@
 				       ordered_extent->len, 0);
 	BUG_ON(ret);
 
-	spin_lock(&em_tree->lock);
-	clear_start = ordered_extent->file_offset;
-	clear_end = ordered_extent->file_offset + ordered_extent->len;
-	while(clear_start < clear_end) {
-		em = lookup_extent_mapping(em_tree, clear_start,
-					   clear_end - clear_start);
-		if (em) {
-			clear_bit(EXTENT_FLAG_PINNED, &em->flags);
-			clear_start = em->start + em->len;
-			free_extent_map(em);
-		} else {
-			break;
-		}
-	}
-	spin_unlock(&em_tree->lock);
-
 	btrfs_drop_extent_cache(inode, ordered_extent->file_offset,
 				ordered_extent->file_offset +
 				ordered_extent->len - 1);
@@ -2318,7 +2320,7 @@
 	u64 extent_end = 0;
 	u64 objectid = inode->i_ino;
 	u32 found_type;
-	struct btrfs_path *path;
+	struct btrfs_path *path = NULL;
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 	struct btrfs_file_extent_item *item;
 	struct extent_buffer *leaf;
@@ -2328,9 +2330,6 @@
 	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
 	struct btrfs_trans_handle *trans = NULL;
 
-	path = btrfs_alloc_path();
-	BUG_ON(!path);
-
 again:
 	spin_lock(&em_tree->lock);
 	em = lookup_extent_mapping(em_tree, start, len);
@@ -2354,6 +2353,12 @@
 	em->bdev = root->fs_info->fs_devices->latest_bdev;
 	em->start = EXTENT_MAP_HOLE;
 	em->len = (u64)-1;
+
+	if (!path) {
+		path = btrfs_alloc_path();
+		BUG_ON(!path);
+	}
+
 	ret = btrfs_lookup_file_extent(trans, root, path,
 				       objectid, start, trans != NULL);
 	if (ret < 0) {
@@ -2530,7 +2535,8 @@
 	}
 	spin_unlock(&em_tree->lock);
 out:
-	btrfs_free_path(path);
+	if (path)
+		btrfs_free_path(path);
 	if (trans) {
 		ret = btrfs_end_transaction(trans, root);
 		if (!err) {
@@ -2643,8 +2649,8 @@
 	return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
 }
 
-static int btrfs_writepages(struct address_space *mapping,
-			    struct writeback_control *wbc)
+int btrfs_writepages(struct address_space *mapping,
+		     struct writeback_control *wbc)
 {
 	struct extent_io_tree *tree;
 	tree = &BTRFS_I(mapping->host)->io_tree;
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index 0d87795..830dbae 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -19,6 +19,8 @@
 #include <linux/gfp.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
+#include <linux/writeback.h>
+#include <linux/pagevec.h>
 #include "ctree.h"
 #include "transaction.h"
 #include "btrfs_inode.h"
@@ -307,12 +309,7 @@
 	 * start IO on any dirty ones so the wait doesn't stall waiting
 	 * for pdflush to find them
 	 */
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
-	do_sync_file_range(file, start, end, SYNC_FILE_RANGE_WRITE);
-#else
-	do_sync_mapping_range(inode->i_mapping, start, end,
-			      SYNC_FILE_RANGE_WRITE);
-#endif
+	btrfs_fdatawrite_range(inode->i_mapping, start, end, WB_SYNC_NONE);
 	if (wait)
 		wait_event(entry->wait, test_bit(BTRFS_ORDERED_COMPLETE,
 						 &entry->flags));
@@ -327,28 +324,26 @@
 	u64 orig_end;
 	u64 wait_end;
 	struct btrfs_ordered_extent *ordered;
-	u64 mask = BTRFS_I(inode)->root->sectorsize - 1;
 
 	if (start + len < start) {
-		wait_end = (inode->i_size + mask) & ~mask;
-		orig_end = (u64)-1;
+		orig_end = INT_LIMIT(loff_t);
 	} else {
 		orig_end = start + len - 1;
-		wait_end = orig_end;
+		if (orig_end > INT_LIMIT(loff_t))
+			orig_end = INT_LIMIT(loff_t);
 	}
+	wait_end = orig_end;
 again:
 	/* start IO across the range first to instantiate any delalloc
 	 * extents
 	 */
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
-	do_sync_file_range(file, start, wait_end, SYNC_FILE_RANGE_WRITE);
-#else
-	do_sync_mapping_range(inode->i_mapping, start, wait_end,
-			      SYNC_FILE_RANGE_WRITE);
-#endif
-	end = orig_end;
-	wait_on_extent_writeback(&BTRFS_I(inode)->io_tree, start, orig_end);
+	btrfs_fdatawrite_range(inode->i_mapping, start, orig_end, WB_SYNC_NONE);
 
+	btrfs_wait_on_page_writeback_range(inode->i_mapping,
+					   start >> PAGE_CACHE_SHIFT,
+					   orig_end >> PAGE_CACHE_SHIFT);
+
+	end = orig_end;
 	while(1) {
 		ordered = btrfs_lookup_first_ordered_extent(inode, end);
 		if (!ordered) {
@@ -565,3 +560,87 @@
 	return ret;
 }
 
+
+/**
+ * taken from mm/filemap.c because it isn't exported
+ *
+ * __filemap_fdatawrite_range - start writeback on mapping dirty pages in range
+ * @mapping:	address space structure to write
+ * @start:	offset in bytes where the range starts
+ * @end:	offset in bytes where the range ends (inclusive)
+ * @sync_mode:	enable synchronous operation
+ *
+ * Start writeback against all of a mapping's dirty pages that lie
+ * within the byte offsets <start, end> inclusive.
+ *
+ * If sync_mode is WB_SYNC_ALL then this is a "data integrity" operation, as
+ * opposed to a regular memory cleansing writeback.  The difference between
+ * these two operations is that if a dirty page/buffer is encountered, it must
+ * be waited upon, and not just skipped over.
+ */
+int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
+			   loff_t end, int sync_mode)
+{
+	struct writeback_control wbc = {
+		.sync_mode = sync_mode,
+		.nr_to_write = mapping->nrpages * 2,
+		.range_start = start,
+		.range_end = end,
+		.for_writepages = 1,
+	};
+	return btrfs_writepages(mapping, &wbc);
+}
+
+/**
+ * taken from mm/filemap.c because it isn't exported
+ *
+ * wait_on_page_writeback_range - wait for writeback to complete
+ * @mapping:	target address_space
+ * @start:	beginning page index
+ * @end:	ending page index
+ *
+ * Wait for writeback to complete against pages indexed by start->end
+ * inclusive
+ */
+int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
+				       pgoff_t start, pgoff_t end)
+{
+	struct pagevec pvec;
+	int nr_pages;
+	int ret = 0;
+	pgoff_t index;
+
+	if (end < start)
+		return 0;
+
+	pagevec_init(&pvec, 0);
+	index = start;
+	while ((index <= end) &&
+			(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
+			PAGECACHE_TAG_WRITEBACK,
+			min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1)) != 0) {
+		unsigned i;
+
+		for (i = 0; i < nr_pages; i++) {
+			struct page *page = pvec.pages[i];
+
+			/* until radix tree lookup accepts end_index */
+			if (page->index > end)
+				continue;
+
+			wait_on_page_writeback(page);
+			if (PageError(page))
+				ret = -EIO;
+		}
+		pagevec_release(&pvec);
+		cond_resched();
+	}
+
+	/* Check for outstanding write errors */
+	if (test_and_clear_bit(AS_ENOSPC, &mapping->flags))
+		ret = -ENOSPC;
+	if (test_and_clear_bit(AS_EIO, &mapping->flags))
+		ret = -EIO;
+
+	return ret;
+}
diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h
index 1794efd..8e8e3c0 100644
--- a/fs/btrfs/ordered-data.h
+++ b/fs/btrfs/ordered-data.h
@@ -132,4 +132,8 @@
 int btrfs_ordered_update_i_size(struct inode *inode,
 				struct btrfs_ordered_extent *ordered);
 int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u32 *sum);
+int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
+				       pgoff_t start, pgoff_t end);
+int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
+			   loff_t end, int sync_mode);
 #endif
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 0582390..38c75a0 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -649,7 +649,6 @@
 	extent_io_tree_init(pinned_copy,
 			     root->fs_info->btree_inode->i_mapping, GFP_NOFS);
 
-printk("commit trans %Lu\n", trans->transid);
 	trans->transaction->in_commit = 1;
 	trans->transaction->blocked = 1;
 	cur_trans = trans->transaction;
@@ -745,7 +744,6 @@
 		list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots);
 
 	mutex_unlock(&root->fs_info->trans_mutex);
-printk("done commit trans %Lu\n", trans->transid);
 	kmem_cache_free(btrfs_trans_handle_cachep, trans);
 
 	if (root->fs_info->closing) {