@@ -4977,12 +5054,12 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 	unsigned long len = fs_info->nodesize;
 	unsigned long num_pages = num_extent_pages(start, len);
 	unsigned long i;
-	unsigned long index = start >> PAGE_SHIFT;
 	struct extent_buffer *eb;
 	struct extent_buffer *exists = NULL;
 	struct page *p;
-	struct address_space *mapping = fs_info->btree_inode->i_mapping;
-	int uptodate = 1;
+	struct btrfs_eb_info *eb_info = fs_info->eb_info;
+//	struct zone *last_zone = NULL;
+//	struct pg_data_t *last_pgdata = NULL;

 	int ret;
 
 	if (!IS_ALIGNED(start, fs_info->sectorsize)) {

@@ -4990,62 +5067,36 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 		return ERR_PTR(-EINVAL);
 	}
 
-	eb = find_extent_buffer(fs_info, start);
+	eb = find_extent_buffer(eb_info, start);
 	if (eb)
 		return eb;
 
-	eb = __alloc_extent_buffer(fs_info, start, len);
+	eb = __alloc_extent_buffer(eb_info, start, len);
 	if (!eb)
 		return ERR_PTR(-ENOMEM);
 
-	for (i = 0; i < num_pages; i++, index++) {
-		p = find_or_create_page(mapping, index, GFP_NOFS|__GFP_NOFAIL);
+	for (i = 0; i < num_pages; i++) {
+		p = alloc_page(GFP_NOFS|__GFP_NOFAIL);
 		if (!p) {
 			exists = ERR_PTR(-ENOMEM);
 			goto free_eb;
 		}
 
-		spin_lock(&mapping->private_lock);
-		if (PagePrivate(p)) {
-			/*
-			 * We could have already allocated an eb for this page
-			 * and attached one so lets see if we can get a ref on
-			 * the existing eb, and if we can we know it's good and
-			 * we can just return that one, else we know we can just
-			 * overwrite page->private.
-			 */
-			exists = (struct extent_buffer *)p->private;
-			if (atomic_inc_not_zero(&exists->refs)) {
-				spin_unlock(&mapping->private_lock);
-				unlock_page(p);
-				put_page(p);
-				mark_extent_buffer_accessed(exists, p);
-				goto free_eb;
-			}
-			exists = NULL;
-
-			/*
-			 * Do this so attach doesn't complain and we need to
-			 * drop the ref the old guy had.
-			 */
-			ClearPagePrivate(p);
-			WARN_ON(PageDirty(p));
-			put_page(p);
-		}
+		/*
+		 * If our pages span zones or numa nodes we have to do
+		 * dirty/writeback accounting per page, otherwise we can do it
+		 * in bulk and save us some looping.
+		 *
+		if (!last_zone)
+			last_zone = page_zone(p);
+		if (!last_pgdata)
+			last_pgdata = page_pgdata(p);
+		if (last_zone != page_zone(p) || last_pgdata != page_pgdata(p))
+			set_bit(EXTENT_BUFFER_MIXED_PAGES, &eb->bflags);
+		*/
 		attach_extent_buffer_page(eb, p);
-		spin_unlock(&mapping->private_lock);
-		WARN_ON(PageDirty(p));
 		eb->pages[i] = p;
-		if (!PageUptodate(p))
-			uptodate = 0;
-
-		/*
-		 * see below about how we avoid a nasty race with release page
-		 * and why we unlock later
-		 */
 	}
-	if (uptodate)
-		set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
 again:
 	ret = radix_tree_preload(GFP_NOFS);
 	if (ret) {

@@ -5053,13 +5104,13 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 		goto free_eb;
 	}
 
-	spin_lock(&fs_info->buffer_lock);
-	ret = radix_tree_insert(&fs_info->buffer_radix,
+	spin_lock_irq(&eb_info->buffer_lock);
+	ret = radix_tree_insert(&eb_info->buffer_radix,
 				start >> PAGE_SHIFT, eb);
-	spin_unlock(&fs_info->buffer_lock);
+	spin_unlock_irq(&eb_info->buffer_lock);
 	radix_tree_preload_end();
 	if (ret == -EEXIST) {
-		exists = find_extent_buffer(fs_info, start);
+		exists = find_extent_buffer(eb_info, start);
 		if (exists)
 			goto free_eb;
 		else

@@ -5069,31 +5120,10 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 	check_buffer_tree_ref(eb);
 	set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags);
 
-	/*
-	 * there is a race where release page may have
-	 * tried to find this extent buffer in the radix
-	 * but failed.  It will tell the VM it is safe to
-	 * reclaim the, and it will clear the page private bit.
-	 * We must make sure to set the page private bit properly
-	 * after the extent buffer is in the radix tree so
-	 * it doesn't get lost
-	 */
-	SetPageChecked(eb->pages[0]);
-	for (i = 1; i < num_pages; i++) {
-		p = eb->pages[i];
-		ClearPageChecked(p);
-		unlock_page(p);
-	}
-	unlock_page(eb->pages[0]);
 	return eb;
 
 free_eb:
 	WARN_ON(!atomic_dec_and_test(&eb->refs));
-	for (i = 0; i < num_pages; i++) {
-		if (eb->pages[i])
-			unlock_page(eb->pages[i]);
-	}
-
 	btrfs_release_extent_buffer(eb);
 	return exists;
 }

@@ -5109,17 +5139,19 @@ static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head)
 /* Expects to have eb->eb_lock already held */
 static int release_extent_buffer(struct extent_buffer *eb)
 {
+	struct btrfs_eb_info *eb_info = eb->eb_info;
+
 	WARN_ON(atomic_read(&eb->refs) == 0);
 	if (atomic_dec_and_test(&eb->refs)) {
+		if (eb_info)
+			list_lru_del(&eb_info->lru_list, &eb->lru);
 		if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) {
-			struct btrfs_fs_info *fs_info = eb->fs_info;
-
 			spin_unlock(&eb->refs_lock);
 
-			spin_lock(&fs_info->buffer_lock);
-			radix_tree_delete(&fs_info->buffer_radix,
-					  eb->start >> PAGE_SHIFT);
-			spin_unlock(&fs_info->buffer_lock);
+			spin_lock_irq(&eb_info->buffer_lock);
+			radix_tree_delete(&eb_info->buffer_radix,
+					  eb_index(eb));
+			spin_unlock_irq(&eb_info->buffer_lock);
 		} else {
 			spin_unlock(&eb->refs_lock);
 		}

@@ -5134,6 +5166,8 @@ static int release_extent_buffer(struct extent_buffer *eb)
 #endif
 		call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu);
 		return 1;
+	} else if (eb_info && atomic_read(&eb->refs) == 1) {
+		list_lru_add(&eb_info->lru_list, &eb->lru);
 	}
 	spin_unlock(&eb->refs_lock);
 

@@ -5167,10 +5201,6 @@ void free_extent_buffer(struct extent_buffer *eb)
 	    test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags))
 		atomic_dec(&eb->refs);
 
-	/*
-	 * I know this is terrible, but it's temporary until we stop tracking
-	 * the uptodate bits and such for the extent buffers.
-	 */
 	release_extent_buffer(eb);
 }
 

@@ -5188,82 +5218,156 @@ void free_extent_buffer_stale(struct extent_buffer *eb)
 	release_extent_buffer(eb);
 }
 
-void clear_extent_buffer_dirty(struct extent_buffer *eb)
+long btrfs_nr_ebs(struct super_block *sb, struct shrink_control *sc)
 {
-	unsigned long i;
-	unsigned long num_pages;
-	struct page *page;
+	struct btrfs_fs_info *fs_info = btrfs_sb(sb);
+	struct btrfs_eb_info *eb_info = fs_info->eb_info;
 
-	num_pages = num_extent_pages(eb->start, eb->len);
+	return list_lru_shrink_count(&eb_info->lru_list, sc);
+}
 
-	for (i = 0; i < num_pages; i++) {
-		page = eb->pages[i];
-		if (!PageDirty(page))
-			continue;
+static enum lru_status eb_lru_isolate(struct list_head *item,
+				      struct list_lru_one *lru,
+				      spinlock_t *lru_lock, void *arg)
+{
+	struct list_head *freeable = (struct list_head *)arg;
+	struct extent_buffer *eb = container_of(item, struct extent_buffer,
+						lru);
+	enum lru_status ret;
+	int refs;
 
-		lock_page(page);
-		WARN_ON(!PagePrivate(page));
+	if (!spin_trylock(&eb->refs_lock))
+		return LRU_SKIP;
 
-		clear_page_dirty_for_io(page);
-		spin_lock_irq(&page->mapping->tree_lock);
-		if (!PageDirty(page)) {
-			radix_tree_tag_clear(&page->mapping->page_tree,
-						page_index(page),
-						PAGECACHE_TAG_DIRTY);
-		}
-		spin_unlock_irq(&page->mapping->tree_lock);
-		ClearPageError(page);
-		unlock_page(page);
+	if (extent_buffer_under_io(eb)) {
+		ret = LRU_ROTATE;
+		goto out;
 	}
+
+	refs = atomic_read(&eb->refs);
+	/* We can race with somebody freeing us, just skip if this happens. */
+	if (refs == 0) {
+		ret = LRU_SKIP;
+		goto out;
+	}
+
+	/* Eb is in use, don't kill it. */
+	if (refs > 1) {
+		ret = LRU_ROTATE;
+		goto out;
+	}
+
+	/*
+	 * If we don't clear the TREE_REF flag then this eb is going to
+	 * disappear soon anyway.  Otherwise we become responsible for dropping
+	 * the last ref on this eb and we know it'll survive until we call
+	 * dispose_list.
+	 */
+	if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) {
+		ret = LRU_SKIP;
+		goto out;
+	}
+	list_lru_isolate_move(lru, &eb->lru, freeable);
+	ret = LRU_REMOVED;
+out:
+	spin_unlock(&eb->refs_lock);
+	return ret;
+}
+
+static void dispose_list(struct list_head *list)
+{
+	struct extent_buffer *eb;
+
+	while (!list_empty(list)) {
+		eb = list_first_entry(list, struct extent_buffer, lru);
+
+		spin_lock(&eb->refs_lock);
+		list_del_init(&eb->lru);
+		spin_unlock(&eb->refs_lock);
+		free_extent_buffer(eb);
+		cond_resched();
+	}
+}
+
+long btrfs_free_ebs(struct super_block *sb, struct shrink_control *sc)
+{
+	struct btrfs_fs_info *fs_info = btrfs_sb(sb);
+	struct btrfs_eb_info *eb_info = fs_info->eb_info;
+	LIST_HEAD(freeable);
+	long freed;
+
+	freed = list_lru_shrink_walk(&eb_info->lru_list, sc, eb_lru_isolate,
+				     &freeable);
+	dispose_list(&freeable);
+	return freed;
+}
+
+void btrfs_invalidate_eb_info(struct btrfs_eb_info *eb_info)
+{
+	LIST_HEAD(freeable);
+
+	/*
+	 * We should be able to free all the extent buffers at this point, if we
+	 * can't there's a problem and we should complain loudly about it.
+	 */
+	do {
+		list_lru_walk(&eb_info->lru_list, eb_lru_isolate, &freeable, LONG_MAX);
+	} while (WARN_ON(list_lru_count(&eb_info->lru_list)));
+	dispose_list(&freeable);
+	synchronize_rcu();
+}
+
+int clear_extent_buffer_dirty(struct extent_buffer *eb)
+{
+	struct btrfs_eb_info *eb_info = eb->eb_info;
+	struct super_block *sb = eb_info->fs_info->sb;
+	unsigned long num_pages;
+
+	if (!test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags))
+		return 0;
+
+	spin_lock_irq(&eb_info->buffer_lock);
+	radix_tree_tag_clear(&eb_info->buffer_radix, eb_index(eb),
+			     PAGECACHE_TAG_DIRTY);
+	spin_unlock_irq(&eb_info->buffer_lock);
+
+	num_pages = num_extent_pages(eb->start, eb->len);
+	account_metadata_cleaned(eb->pages[0], sb->s_bdi, eb->len);
 	WARN_ON(atomic_read(&eb->refs) == 0);
+	return 1;
 }
 
 int set_extent_buffer_dirty(struct extent_buffer *eb)
 {
-	unsigned long i;
+	struct btrfs_eb_info *eb_info = eb->eb_info;
+	struct super_block *sb = eb_info->fs_info->sb;
 	unsigned long num_pages;
 	int was_dirty = 0;
 
 	check_buffer_tree_ref(eb);
 
-	was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags);
-
-	num_pages = num_extent_pages(eb->start, eb->len);
 	WARN_ON(atomic_read(&eb->refs) == 0);
 	WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags));
+	if (test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags))
+		return 1;
 
-	for (i = 0; i < num_pages; i++)
-		set_page_dirty(eb->pages[i]);
+	num_pages = num_extent_pages(eb->start, eb->len);
+	account_metadata_dirtied(eb->pages[0], sb->s_bdi, eb->len);
+	spin_lock_irq(&eb_info->buffer_lock);
+	radix_tree_tag_set(&eb_info->buffer_radix, eb_index(eb),
+			   PAGECACHE_TAG_DIRTY);
+	spin_unlock_irq(&eb_info->buffer_lock);
 	return was_dirty;
 }
 
 void clear_extent_buffer_uptodate(struct extent_buffer *eb)
 {
-	unsigned long i;
-	struct page *page;
-	unsigned long num_pages;
-
 	clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
-	num_pages = num_extent_pages(eb->start, eb->len);
-	for (i = 0; i < num_pages; i++) {
-		page = eb->pages[i];
-		if (page)
-			ClearPageUptodate(page);
-	}
 }
 
 void set_extent_buffer_uptodate(struct extent_buffer *eb)
 {
-	unsigned long i;
-	struct page *page;
-	unsigned long num_pages;
-
 	set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
-	num_pages = num_extent_pages(eb->start, eb->len);
-	for (i = 0; i < num_pages; i++) {
-		page = eb->pages[i];
-		SetPageUptodate(page);
-	}
 }
 
 int extent_buffer_uptodate(struct extent_buffer *eb)

@@ -5271,112 +5375,165 @@ int extent_buffer_uptodate(struct extent_buffer *eb)
 	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
 }
 
-int read_extent_buffer_pages(struct extent_io_tree *tree,
-			     struct extent_buffer *eb, int wait,
-			     get_extent_t *get_extent, int mirror_num)
+static void end_bio_extent_buffer_readpage(struct bio *bio)
 {
+	struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
+	struct extent_io_tree *tree = NULL;
+	struct bio_vec *bvec;
+	u64 unlock_start = 0, unlock_len = 0;
+	int mirror_num = io_bio->mirror_num;
+	int uptodate = !bio->bi_status;
+	int i, ret;
+
+	bio_for_each_segment_all(bvec, bio, i) {
+		struct page *page = bvec->bv_page;
+		struct btrfs_eb_info *eb_info;
+		struct extent_buffer *eb;
+
+		eb = (struct extent_buffer *)page->private;
+		if (WARN_ON(!eb))
+			continue;
+
+		eb_info = eb->eb_info;
+		if (!tree)
+			tree = &eb_info->io_tree;
+		if (uptodate) {
+			/*
+			 * btree_readpage_end_io_hook doesn't care about
+			 * start/end so just pass 0.  We'll kill this later.
+			 */
+			ret = tree->ops->readpage_end_io_hook(io_bio, 0,
+							      page, 0, 0,
+							      mirror_num);
+			if (ret) {
+				uptodate = 0;
+			} else {
+				u64 start = eb->start;
+				int c, num_pages;
+
+				num_pages = num_extent_pages(eb->start,
+							     eb->len);
+				for (c = 0; c < num_pages; c++) {
+					if (eb->pages[c] == page)
+						break;
+					start += PAGE_SIZE;
+				}
+				clean_io_failure(eb_info->fs_info,
+						 &eb_info->io_failure_tree,
+						 tree, start, page, 0, 0);
+			}
+		}
+		/*
+		 * We never fix anything in btree_io_failed_hook.
+		 *
+		 * TODO: rework the io failed hook to not assume we can fix
+		 * anything.
+		 */
+		if (!uptodate)
+			tree->ops->readpage_io_failed_hook(page, mirror_num);
+
+		if (unlock_start == 0) {
+			unlock_start = eb->start;
+			unlock_len = PAGE_SIZE;
+		} else {
+			unlock_len += PAGE_SIZE;
+		}
+	}
+
+	if (unlock_start)
+		unlock_extent(tree, unlock_start,
+			      unlock_start + unlock_len - 1);
+	if (io_bio->end_io)
+		io_bio->end_io(io_bio, blk_status_to_errno(bio->bi_status));
+	bio_put(bio);
+}
+
+int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
+			     int mirror_num)
+{
+	struct btrfs_eb_info *eb_info = eb->eb_info;
+	struct extent_io_tree *io_tree = &eb_info->io_tree;
+	struct block_device *bdev = eb_info->fs_info->fs_devices->latest_bdev;
+	struct bio *bio = NULL;
+	u64 offset = eb->start;
+	u64 unlock_start = 0, unlock_len = 0;
 	unsigned long i;
 	struct page *page;
 	int err;
 	int ret = 0;
-	int locked_pages = 0;
-	int all_uptodate = 1;
 	unsigned long num_pages;
-	unsigned long num_reads = 0;
-	struct bio *bio = NULL;
-	unsigned long bio_flags = 0;
 
 	if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags))
 		return 0;
 
-	num_pages = num_extent_pages(eb->start, eb->len);
-	for (i = 0; i < num_pages; i++) {
-		page = eb->pages[i];
-		if (wait == WAIT_NONE) {
-			if (!trylock_page(page))
-				goto unlock_exit;
-		} else {
-			lock_page(page);
-		}
-		locked_pages++;
-	}
-	/*
-	 * We need to firstly lock all pages to make sure that
-	 * the uptodate bit of our pages won't be affected by
-	 * clear_extent_buffer_uptodate().
-	 */
-	for (i = 0; i < num_pages; i++) {
-		page = eb->pages[i];
-		if (!PageUptodate(page)) {
-			num_reads++;
-			all_uptodate = 0;
-		}
-	}
-
-	if (all_uptodate) {
-		set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
-		goto unlock_exit;
+	if (test_and_set_bit(EXTENT_BUFFER_READING, &eb->bflags)) {
+		if (wait != WAIT_COMPLETE)
+			return 0;
+		wait_on_bit_io(&eb->bflags, EXTENT_BUFFER_READING,
+			       TASK_UNINTERRUPTIBLE);
+		if (!test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags))
+			ret = -EIO;
+		return ret;
 	}
 
+	lock_extent(io_tree, eb->start, eb->start + eb->len - 1);
+	num_pages = num_extent_pages(eb->start, eb->len);
 	clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags);
 	eb->read_mirror = 0;
-	atomic_set(&eb->io_pages, num_reads);
+	atomic_set(&eb->io_pages, num_pages);
 	for (i = 0; i < num_pages; i++) {
 		page = eb->pages[i];
-
-		if (!PageUptodate(page)) {
-			if (ret) {
-				atomic_dec(&eb->io_pages);
-				unlock_page(page);
-				continue;
+		if (ret) {
+			unlock_len += PAGE_SIZE;
+			if (atomic_dec_and_test(&eb->io_pages)) {
+				clear_bit(EXTENT_BUFFER_READING, &eb->bflags);
+				smp_mb__after_atomic();
+				wake_up_bit(&eb->bflags, EXTENT_BUFFER_READING);
 			}
+			continue;
+		}
 
-			ClearPageError(page);
-			err = __extent_read_full_page(tree, page,
-						      get_extent, &bio,
-						      mirror_num, &bio_flags,
-						      REQ_META);
-			if (err) {
-				ret = err;
-				/*
-				 * We use &bio in above __extent_read_full_page,
-				 * so we ensure that if it returns error, the
-				 * current page fails to add itself to bio and
-				 * it's been unlocked.
-				 *
-				 * We must dec io_pages by ourselves.
-				 */
-				atomic_dec(&eb->io_pages);
+		err = submit_extent_page(REQ_OP_READ | REQ_META, io_tree, NULL,
+					 page, offset >> 9, PAGE_SIZE, 0, bdev,
+					 &bio, end_bio_extent_buffer_readpage,
+					 mirror_num, 0, 0, 0, false);
+		if (err) {
+			ret = err;
+			/*
+			 * We use &bio in above submit_extent_page
+			 * so we ensure that if it returns error, the
+			 * current page fails to add itself to bio and
+			 * it's been unlocked.
+			 *
+			 * We must dec io_pages by ourselves.
+			 */
+			if (atomic_dec_and_test(&eb->io_pages)) {
+				clear_bit(EXTENT_BUFFER_READING, &eb->bflags);
+				smp_mb__after_atomic();
+				wake_up_bit(&eb->bflags, EXTENT_BUFFER_READING);
 			}
-		} else {
-			unlock_page(page);
+			unlock_start = eb->start;
+			unlock_len = PAGE_SIZE;
 		}
+		offset += PAGE_SIZE;
 	}
 
 	if (bio) {
-		err = submit_one_bio(bio, mirror_num, bio_flags);
+		err = submit_one_bio(bio, mirror_num, 0);
 		if (err)
 			return err;
 	}
 
+	if (ret && unlock_start)
+		unlock_extent(io_tree, unlock_start,
+			      unlock_start + unlock_len - 1);
 	if (ret || wait != WAIT_COMPLETE)
 		return ret;
 
-	for (i = 0; i < num_pages; i++) {
-		page = eb->pages[i];
-		wait_on_page_locked(page);
-		if (!PageUptodate(page))
-			ret = -EIO;
-	}
-
-	return ret;
-
-unlock_exit:
-	while (locked_pages > 0) {
-		locked_pages--;
-		page = eb->pages[locked_pages];
-		unlock_page(page);
-	}
+	wait_on_bit_io(&eb->bflags, EXTENT_BUFFER_READING,
+		       TASK_UNINTERRUPTIBLE);
+	if (!test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags))
+		ret = -EIO;
 	return ret;
 }
 

@@ -5533,7 +5690,6 @@ void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
 {
 	char *kaddr;
 
-	WARN_ON(!PageUptodate(eb->pages[0]));
 	kaddr = page_address(eb->pages[0]);
 	memcpy(kaddr + offsetof(struct btrfs_header, chunk_tree_uuid), srcv,
 			BTRFS_FSID_SIZE);

@@ -5543,7 +5699,6 @@ void write_extent_buffer_fsid(struct extent_buffer *eb, const void *srcv)
 {
 	char *kaddr;
 
-	WARN_ON(!PageUptodate(eb->pages[0]));
 	kaddr = page_address(eb->pages[0]);
 	memcpy(kaddr + offsetof(struct btrfs_header, fsid), srcv,
 			BTRFS_FSID_SIZE);

@@ -5567,7 +5722,6 @@ void write_extent_buffer(struct extent_buffer *eb, const void *srcv,
 
 	while (len > 0) {
 		page = eb->pages[i];
-		WARN_ON(!PageUptodate(page));
 
 		cur = min(len, PAGE_SIZE - offset);
 		kaddr = page_address(page);

@@ -5597,7 +5751,6 @@ void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
 
 	while (len > 0) {
 		page = eb->pages[i];
-		WARN_ON(!PageUptodate(page));
 
 		cur = min(len, PAGE_SIZE - offset);
 		kaddr = page_address(page);

@@ -5642,7 +5795,6 @@ void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 
 	while (len > 0) {
 		page = dst->pages[i];
-		WARN_ON(!PageUptodate(page));
 
 		cur = min(len, (unsigned long)(PAGE_SIZE - offset));
 

@@ -5745,7 +5897,6 @@ int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
 
 	eb_bitmap_offset(eb, start, nr, &i, &offset);
 	page = eb->pages[i];
-	WARN_ON(!PageUptodate(page));
 	kaddr = page_address(page);
 	return 1U & (kaddr[offset] >> (nr & (BITS_PER_BYTE - 1)));
 }

@@ -5770,7 +5921,6 @@ void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
 
 	eb_bitmap_offset(eb, start, pos, &i, &offset);
 	page = eb->pages[i];
-	WARN_ON(!PageUptodate(page));
 	kaddr = page_address(page);
 
 	while (len >= bits_to_set) {

@@ -5781,7 +5931,6 @@ void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
 		if (++offset >= PAGE_SIZE && len > 0) {
 			offset = 0;
 			page = eb->pages[++i];
-			WARN_ON(!PageUptodate(page));
 			kaddr = page_address(page);
 		}
 	}

@@ -5812,7 +5961,6 @@ void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
 
 	eb_bitmap_offset(eb, start, pos, &i, &offset);
 	page = eb->pages[i];
-	WARN_ON(!PageUptodate(page));
 	kaddr = page_address(page);
 
 	while (len >= bits_to_clear) {

@@ -5823,7 +5971,6 @@ void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
 		if (++offset >= PAGE_SIZE && len > 0) {
 			offset = 0;
 			page = eb->pages[++i];
-			WARN_ON(!PageUptodate(page));
 			kaddr = page_address(page);
 		}
 	}

@@ -5864,7 +6011,7 @@ static void copy_pages(struct page *dst_page, struct page *src_page,
 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 			   unsigned long src_offset, unsigned long len)
 {
-	struct btrfs_fs_info *fs_info = dst->fs_info;
+	struct btrfs_fs_info *fs_info = dst->eb_info->fs_info;
 	size_t cur;
 	size_t dst_off_in_page;
 	size_t src_off_in_page;

@@ -5911,7 +6058,7 @@ void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 			   unsigned long src_offset, unsigned long len)
 {
-	struct btrfs_fs_info *fs_info = dst->fs_info;
+	struct btrfs_fs_info *fs_info = dst->eb_info->fs_info;
 	size_t cur;
 	size_t dst_off_in_page;
 	size_t src_off_in_page;

@@ -5957,45 +6104,3 @@ void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 		len -= cur;
 	}
 }
-
-int try_release_extent_buffer(struct page *page)
-{
-	struct extent_buffer *eb;
-
-	/*
-	 * We need to make sure nobody is attaching this page to an eb right
-	 * now.
-	 */
-	spin_lock(&page->mapping->private_lock);
-	if (!PagePrivate(page)) {
-		spin_unlock(&page->mapping->private_lock);
-		return 1;
-	}
-
-	eb = (struct extent_buffer *)page->private;
-	BUG_ON(!eb);
-
-	/*
-	 * This is a little awful but should be ok, we need to make sure that
-	 * the eb doesn't disappear out from under us while we're looking at
-	 * this page.
-	 */
-	spin_lock(&eb->refs_lock);
-	if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) {
-		spin_unlock(&eb->refs_lock);
-		spin_unlock(&page->mapping->private_lock);
-		return 0;
-	}
-	spin_unlock(&page->mapping->private_lock);
-
-	/*
-	 * If tree ref isn't set then we know the ref on this eb is a real ref,
-	 * so just return, this page will likely be freed soon anyway.
-	 */
-	if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) {
-		spin_unlock(&eb->refs_lock);
-		return 0;
-	}
-
-	return release_extent_buffer(eb);
-}

diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 861dacb371c7..f18cbce1f2f1 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h

@@ -47,6 +47,8 @@
 #define EXTENT_BUFFER_DUMMY 9
 #define EXTENT_BUFFER_IN_TREE 10
 #define EXTENT_BUFFER_WRITE_ERR 11    /* write IO error */
+#define EXTENT_BUFFER_MIXED_PAGES 12	/* the pages span multiple zones or numa nodes. */
+#define EXTENT_BUFFER_READING 13 /* currently reading this eb. */
 
 /* these are flags for __process_pages_contig */
 #define PAGE_UNLOCK		(1 << 0)

@@ -160,13 +162,25 @@ struct extent_state {
 #endif
 };
 
+struct btrfs_eb_info {
+	struct btrfs_fs_info *fs_info;
+	struct extent_io_tree io_tree;
+	struct extent_io_tree io_failure_tree;
+
+	/* Extent buffer radix tree */
+	spinlock_t buffer_lock;
+	struct radix_tree_root buffer_radix;
+	struct list_lru lru_list;
+	pgoff_t writeback_index;
+};
+
 #define INLINE_EXTENT_BUFFER_PAGES 16
 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
 struct extent_buffer {
 	u64 start;
 	unsigned long len;
 	unsigned long bflags;
-	struct btrfs_fs_info *fs_info;
+	struct btrfs_eb_info *eb_info;
 	spinlock_t refs_lock;
 	atomic_t refs;
 	atomic_t io_pages;

@@ -201,6 +215,7 @@ struct extent_buffer {
 #ifdef CONFIG_BTRFS_DEBUG
 	struct list_head leak_list;
 #endif
+	struct list_head lru;
 };
 
 /*

@@ -408,8 +423,6 @@ int extent_writepages(struct extent_io_tree *tree,
 		      struct address_space *mapping,
 		      get_extent_t *get_extent,
 		      struct writeback_control *wbc);
-int btree_write_cache_pages(struct address_space *mapping,
-			    struct writeback_control *wbc);
 int extent_readpages(struct extent_io_tree *tree,
 		     struct address_space *mapping,
 		     struct list_head *pages, unsigned nr_pages,

@@ -420,21 +433,18 @@ void set_page_extent_mapped(struct page *page);
 
 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 					  u64 start);
-struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
-						  u64 start, unsigned long len);
-struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
-						u64 start);
+struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_eb_info *eb_info,
+						u64 start, unsigned long len);
 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
-struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
+struct extent_buffer *find_extent_buffer(struct btrfs_eb_info *eb_info,
 					 u64 start);
 void free_extent_buffer(struct extent_buffer *eb);
 void free_extent_buffer_stale(struct extent_buffer *eb);
 #define WAIT_NONE	0
 #define WAIT_COMPLETE	1
 #define WAIT_PAGE_LOCK	2
-int read_extent_buffer_pages(struct extent_io_tree *tree,
-			     struct extent_buffer *eb, int wait,
-			     get_extent_t *get_extent, int mirror_num);
+int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
+			     int mirror_num);
 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
 
 static inline unsigned long num_extent_pages(u64 start, u64 len)

@@ -448,6 +458,11 @@ static inline void extent_buffer_get(struct extent_buffer *eb)
 	atomic_inc(&eb->refs);
 }
 
+static inline unsigned long eb_index(struct extent_buffer *eb)
+{
+	return eb->start >> PAGE_SHIFT;
+}
+
 int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
 			 unsigned long start, unsigned long len);
 void read_extent_buffer(const struct extent_buffer *eb, void *dst,

@@ -478,7 +493,7 @@ void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
 			      unsigned long pos, unsigned long len);
 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
 				unsigned long pos, unsigned long len);
-void clear_extent_buffer_dirty(struct extent_buffer *eb);
+int clear_extent_buffer_dirty(struct extent_buffer *eb);
 int set_extent_buffer_dirty(struct extent_buffer *eb);
 void set_extent_buffer_uptodate(struct extent_buffer *eb);
 void clear_extent_buffer_uptodate(struct extent_buffer *eb);

@@ -512,6 +527,14 @@ int clean_io_failure(struct btrfs_fs_info *fs_info,
 void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 int repair_eb_io_failure(struct btrfs_fs_info *fs_info,
 			 struct extent_buffer *eb, int mirror_num);
+void btree_flush(struct btrfs_fs_info *fs_info);
+int btree_write_range(struct btrfs_fs_info *fs_info, u64 start, u64 end);
+int btree_wait_range(struct btrfs_fs_info *fs_info, u64 start, u64 end);
+long btrfs_free_ebs(struct super_block *sb, struct shrink_control *sc);
+long btrfs_nr_ebs(struct super_block *sb, struct shrink_control *sc);
+void btrfs_write_ebs(struct super_block *sb, struct writeback_control *wbc);
+void btrfs_invalidate_eb_info(struct btrfs_eb_info *eb_info);
+int btrfs_init_eb_info(struct btrfs_fs_info *fs_info);
 
 /*
  * When IO fails, either with EIO or csum verification fails, we

@@ -552,6 +575,6 @@ noinline u64 find_lock_delalloc_range(struct inode *inode,
 				      struct page *locked_page, u64 *start,
 				      u64 *end, u64 max_bytes);
 #endif
-struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
-					       u64 start);
+struct extent_buffer *alloc_test_extent_buffer(struct btrfs_eb_info *eb_info,
+					       u64 start, u32 nodesize);
 #endif

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 46b5632a7c6d..27bc64fb6d3e 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c

@@ -1877,9 +1877,9 @@ static void btrfs_clear_bit_hook(void *private_data,
  * return 0 if page can be merged to bio
  * return error otherwise
  */
-int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
-			 size_t size, struct bio *bio,
-			 unsigned long bio_flags)
+static int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
+				size_t size, struct bio *bio,
+				unsigned long bio_flags)
 {
 	struct inode *inode = page->mapping->host;
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index 569205e651c7..f912c8166d94 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c

@@ -102,6 +102,7 @@ static void print_extent_item(struct extent_buffer *eb, int slot, int type)
 	ptr = (unsigned long)iref;
 	end = (unsigned long)ei + item_size;
 	while (ptr < end) {
+		struct btrfs_fs_info *fs_info = eb->eb_info->fs_info;
 		iref = (struct btrfs_extent_inline_ref *)ptr;
 		type = btrfs_extent_inline_ref_type(eb, iref);
 		offset = btrfs_extent_inline_ref_offset(eb, iref);

@@ -116,9 +117,9 @@ static void print_extent_item(struct extent_buffer *eb, int slot, int type)
 			 * offset is supposed to be a tree block which
 			 * must be aligned to nodesize.
 			 */
-			if (!IS_ALIGNED(offset, eb->fs_info->nodesize))
+			if (!IS_ALIGNED(offset, fs_info->nodesize))
 				pr_info("\t\t\t(parent %llu is NOT ALIGNED to nodesize %llu)\n",
-					offset, (unsigned long long)eb->fs_info->nodesize);
+					offset, (unsigned long long)fs_info->nodesize);
 			break;
 		case BTRFS_EXTENT_DATA_REF_KEY:
 			dref = (struct btrfs_extent_data_ref *)(&iref->offset);

@@ -132,9 +133,9 @@ static void print_extent_item(struct extent_buffer *eb, int slot, int type)
 			 * offset is supposed to be a tree block which
 			 * must be aligned to nodesize.
 			 */
-			if (!IS_ALIGNED(offset, eb->fs_info->nodesize))
+			if (!IS_ALIGNED(offset, fs_info->nodesize))
 				pr_info("\t\t\t(parent %llu is NOT ALIGNED to nodesize %llu)\n",
-				     offset, (unsigned long long)eb->fs_info->nodesize);
+				     offset, (unsigned long long)fs_info->nodesize);
 			break;
 		default:
 			pr_cont("(extent %llu has INVALID ref type %d)\n",

@@ -199,7 +200,7 @@ void btrfs_print_leaf(struct extent_buffer *l)
 	if (!l)
 		return;
 
-	fs_info = l->fs_info;
+	fs_info = l->eb_info->fs_info;
 	nr = btrfs_header_nritems(l);
 
 	btrfs_info(fs_info, "leaf %llu total ptrs %d free space %d",

@@ -347,7 +348,7 @@ void btrfs_print_tree(struct extent_buffer *c)
 
 	if (!c)
 		return;
-	fs_info = c->fs_info;
+	fs_info = c->eb_info->fs_info;
 	nr = btrfs_header_nritems(c);
 	level = btrfs_header_level(c);
 	if (level == 0) {

diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index ab852b8e3e37..c6244890085f 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c

@@ -210,7 +210,7 @@ static void __readahead_hook(struct btrfs_fs_info *fs_info,
 
 int btree_readahead_hook(struct extent_buffer *eb, int err)
 {
-	struct btrfs_fs_info *fs_info = eb->fs_info;
+	struct btrfs_fs_info *fs_info = eb->eb_info->fs_info;
 	int ret = 0;
 	struct reada_extent *re;
 

diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index 3338407ef0f0..e40bd9a910dd 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c

@@ -45,7 +45,7 @@ static void btrfs_read_root_item(struct extent_buffer *eb, int slot,
 	if (!need_reset && btrfs_root_generation(item)
 		!= btrfs_root_generation_v2(item)) {
 		if (btrfs_root_generation_v2(item) != 0) {
-			btrfs_warn(eb->fs_info,
+			btrfs_warn(eb->eb_info->fs_info,
 					"mismatching generation and generation_v2 found in root item. This root was probably mounted with an older kernel. Resetting all new fields.");
 		}
 		need_reset = 1;

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 8e74f7029e12..3b5fe791639d 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c

@@ -1198,7 +1198,7 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
 	trace_btrfs_sync_fs(fs_info, wait);
 
 	if (!wait) {
-		filemap_flush(fs_info->btree_inode->i_mapping);
+		btree_flush(fs_info);
 		return 0;
 	}
 

@@ -2284,19 +2284,22 @@ static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
 }
 
 static const struct super_operations btrfs_super_ops = {
-	.drop_inode	= btrfs_drop_inode,
-	.evict_inode	= btrfs_evict_inode,
-	.put_super	= btrfs_put_super,
-	.sync_fs	= btrfs_sync_fs,
-	.show_options	= btrfs_show_options,
-	.show_devname	= btrfs_show_devname,
-	.write_inode	= btrfs_write_inode,
-	.alloc_inode	= btrfs_alloc_inode,
-	.destroy_inode	= btrfs_destroy_inode,
-	.statfs		= btrfs_statfs,
-	.remount_fs	= btrfs_remount,
-	.freeze_fs	= btrfs_freeze,
-	.unfreeze_fs	= btrfs_unfreeze,
+	.drop_inode		= btrfs_drop_inode,
+	.evict_inode		= btrfs_evict_inode,
+	.put_super		= btrfs_put_super,
+	.sync_fs		= btrfs_sync_fs,
+	.show_options		= btrfs_show_options,
+	.show_devname		= btrfs_show_devname,
+	.write_inode		= btrfs_write_inode,
+	.alloc_inode		= btrfs_alloc_inode,
+	.destroy_inode		= btrfs_destroy_inode,
+	.statfs			= btrfs_statfs,
+	.remount_fs		= btrfs_remount,
+	.freeze_fs		= btrfs_freeze,
+	.unfreeze_fs		= btrfs_unfreeze,
+	.nr_cached_objects	= btrfs_nr_ebs,
+	.free_cached_objects	= btrfs_free_ebs,
+	.write_metadata		= btrfs_write_ebs,
 };
 
 static const struct file_operations btrfs_ctl_fops = {

diff --git a/fs/btrfs/tests/btrfs-tests.c b/fs/btrfs/tests/btrfs-tests.c
index d3f25376a0f8..dbf05b2ab9ee 100644
--- a/fs/btrfs/tests/btrfs-tests.c
+++ b/fs/btrfs/tests/btrfs-tests.c

@@ -102,15 +102,32 @@ struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize)
 
 	fs_info->nodesize = nodesize;
 	fs_info->sectorsize = sectorsize;
+	fs_info->eb_info = kzalloc(sizeof(struct btrfs_eb_info),
+				   GFP_KERNEL);
+	if (!fs_info->eb_info) {
+		kfree(fs_info->fs_devices);
+		kfree(fs_info->super_copy);
+		kfree(fs_info);
+		return NULL;
+	}
+
+	if (btrfs_init_eb_info(fs_info)) {
+		kfree(fs_info->eb_info);
+		kfree(fs_info->fs_devices);
+		kfree(fs_info->super_copy);
+		kfree(fs_info);
+		return NULL;
+	}
 
 	if (init_srcu_struct(&fs_info->subvol_srcu)) {
+		list_lru_destroy(&fs_info->eb_info->lru_list);
+		kfree(fs_info->eb_info);
 		kfree(fs_info->fs_devices);
 		kfree(fs_info->super_copy);
 		kfree(fs_info);
 		return NULL;
 	}
 
-	spin_lock_init(&fs_info->buffer_lock);
 	spin_lock_init(&fs_info->qgroup_lock);
 	spin_lock_init(&fs_info->qgroup_op_lock);
 	spin_lock_init(&fs_info->super_lock);

@@ -126,7 +143,6 @@ struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize)
 	INIT_LIST_HEAD(&fs_info->dirty_qgroups);
 	INIT_LIST_HEAD(&fs_info->dead_roots);
 	INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
-	INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
 	INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
 	extent_io_tree_init(&fs_info->freed_extents[0], NULL);
 	extent_io_tree_init(&fs_info->freed_extents[1], NULL);

@@ -140,6 +156,7 @@ struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize)
 
 void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
 {
+	struct btrfs_eb_info *eb_info;
 	struct radix_tree_iter iter;
 	void **slot;
 

@@ -150,13 +167,14 @@ void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
 			      &fs_info->fs_state)))
 		return;
 
+	eb_info = fs_info->eb_info;
 	test_mnt->mnt_sb->s_fs_info = NULL;
 
-	spin_lock(&fs_info->buffer_lock);
-	radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, 0) {
+	spin_lock_irq(&eb_info->buffer_lock);
+	radix_tree_for_each_slot(slot, &eb_info->buffer_radix, &iter, 0) {
 		struct extent_buffer *eb;
 
-		eb = radix_tree_deref_slot_protected(slot, &fs_info->buffer_lock);
+		eb = radix_tree_deref_slot_protected(slot, &eb_info->buffer_lock);
 		if (!eb)
 			continue;
 		/* Shouldn't happen but that kind of thinking creates CVE's */

@@ -166,15 +184,17 @@ void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
 			continue;
 		}
 		slot = radix_tree_iter_resume(slot, &iter);
-		spin_unlock(&fs_info->buffer_lock);
+		spin_unlock_irq(&eb_info->buffer_lock);
 		free_extent_buffer_stale(eb);
-		spin_lock(&fs_info->buffer_lock);
+		spin_lock_irq(&eb_info->buffer_lock);
 	}
-	spin_unlock(&fs_info->buffer_lock);
+	spin_unlock_irq(&eb_info->buffer_lock);
 
 	btrfs_free_qgroup_config(fs_info);
 	btrfs_free_fs_roots(fs_info);
 	cleanup_srcu_struct(&fs_info->subvol_srcu);
+	list_lru_destroy(&eb_info->lru_list);
+	kfree(fs_info->eb_info);
 	kfree(fs_info->super_copy);
 	kfree(fs_info->fs_devices);
 	kfree(fs_info);

diff --git a/fs/btrfs/tests/extent-buffer-tests.c b/fs/btrfs/tests/extent-buffer-tests.c
index b9142c614114..9a264b81a7b4 100644
--- a/fs/btrfs/tests/extent-buffer-tests.c
+++ b/fs/btrfs/tests/extent-buffer-tests.c

@@ -61,7 +61,8 @@ static int test_btrfs_split_item(u32 sectorsize, u32 nodesize)
 		goto out;
 	}
 
-	path->nodes[0] = eb = alloc_dummy_extent_buffer(fs_info, nodesize);
+	path->nodes[0] = eb = alloc_dummy_extent_buffer(fs_info->eb_info, 0,
+							nodesize);
 	if (!eb) {
 		test_msg("Could not allocate dummy buffer\n");
 		ret = -ENOMEM;

diff --git a/fs/btrfs/tests/extent-io-tests.c b/fs/btrfs/tests/extent-io-tests.c
index d06b1c931d05..600c01ddf0d0 100644
--- a/fs/btrfs/tests/extent-io-tests.c
+++ b/fs/btrfs/tests/extent-io-tests.c

@@ -406,7 +406,7 @@ static int test_eb_bitmaps(u32 sectorsize, u32 nodesize)
 		return -ENOMEM;
 	}
 
-	eb = __alloc_dummy_extent_buffer(fs_info, 0, len);
+	eb = alloc_dummy_extent_buffer(NULL, 0, len);
 	if (!eb) {
 		test_msg("Couldn't allocate test extent buffer\n");
 		kfree(bitmap);

@@ -419,7 +419,7 @@ static int test_eb_bitmaps(u32 sectorsize, u32 nodesize)
 
 	/* Do it over again with an extent buffer which isn't page-aligned. */
 	free_extent_buffer(eb);
-	eb = __alloc_dummy_extent_buffer(NULL, nodesize / 2, len);
+	eb = alloc_dummy_extent_buffer(NULL, nodesize / 2, len);
 	if (!eb) {
 		test_msg("Couldn't allocate test extent buffer\n");
 		kfree(bitmap);

diff --git a/fs/btrfs/tests/free-space-tree-tests.c b/fs/btrfs/tests/free-space-tree-tests.c
index 8444a018cca2..afba937f4365 100644
--- a/fs/btrfs/tests/free-space-tree-tests.c
+++ b/fs/btrfs/tests/free-space-tree-tests.c

@@ -474,7 +474,8 @@ static int run_test(test_func_t test_func, int bitmaps, u32 sectorsize,
 	root->fs_info->free_space_root = root;
 	root->fs_info->tree_root = root;
 
-	root->node = alloc_test_extent_buffer(root->fs_info, nodesize);
+	root->node = alloc_test_extent_buffer(fs_info->eb_info, nodesize,
+					      nodesize);
 	if (!root->node) {
 		test_msg("Couldn't allocate dummy buffer\n");
 		ret = -ENOMEM;

diff --git a/fs/btrfs/tests/inode-tests.c b/fs/btrfs/tests/inode-tests.c
index 11c77eafde00..486aa7fbfce2 100644
--- a/fs/btrfs/tests/inode-tests.c
+++ b/fs/btrfs/tests/inode-tests.c

@@ -261,7 +261,7 @@ static noinline int test_btrfs_get_extent(u32 sectorsize, u32 nodesize)
 		goto out;
 	}
 
-	root->node = alloc_dummy_extent_buffer(fs_info, nodesize);
+	root->node = alloc_dummy_extent_buffer(fs_info->eb_info, 0, nodesize);
 	if (!root->node) {
 		test_msg("Couldn't allocate dummy buffer\n");
 		goto out;

@@ -867,7 +867,7 @@ static int test_hole_first(u32 sectorsize, u32 nodesize)
 		goto out;
 	}
 
-	root->node = alloc_dummy_extent_buffer(fs_info, nodesize);
+	root->node = alloc_dummy_extent_buffer(fs_info->eb_info, 0, nodesize);
 	if (!root->node) {
 		test_msg("Couldn't allocate dummy buffer\n");
 		goto out;

diff --git a/fs/btrfs/tests/qgroup-tests.c b/fs/btrfs/tests/qgroup-tests.c
index 0f4ce970d195..0ba27cd9ae4c 100644
--- a/fs/btrfs/tests/qgroup-tests.c
+++ b/fs/btrfs/tests/qgroup-tests.c

@@ -486,7 +486,8 @@ int btrfs_test_qgroups(u32 sectorsize, u32 nodesize)
 	 * Can't use bytenr 0, some things freak out
 	 * *cough*backref walking code*cough*
 	 */
-	root->node = alloc_test_extent_buffer(root->fs_info, nodesize);
+	root->node = alloc_test_extent_buffer(fs_info->eb_info, nodesize,
+					      nodesize);
 	if (!root->node) {
 		test_msg("Couldn't allocate dummy buffer\n");
 		ret = -ENOMEM;

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 9fed8c67b6e8..5df3963c413e 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c

@@ -293,8 +293,7 @@ static noinline int join_transaction(struct btrfs_fs_info *fs_info,
 	INIT_LIST_HEAD(&cur_trans->deleted_bgs);
 	spin_lock_init(&cur_trans->dropped_roots_lock);
 	list_add_tail(&cur_trans->list, &fs_info->trans_list);
-	extent_io_tree_init(&cur_trans->dirty_pages,
-			     fs_info->btree_inode);
+	extent_io_tree_init(&cur_trans->dirty_pages, NULL);
 	fs_info->generation++;
 	cur_trans->transid = fs_info->generation;
 	fs_info->running_transaction = cur_trans;

@@ -944,12 +943,10 @@ int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info,
 {
 	int err = 0;
 	int werr = 0;
-	struct address_space *mapping = fs_info->btree_inode->i_mapping;
 	struct extent_state *cached_state = NULL;
 	u64 start = 0;
 	u64 end;
 
-	atomic_inc(&BTRFS_I(fs_info->btree_inode)->sync_writers);
 	while (!find_first_extent_bit(dirty_pages, start, &start, &end,
 				      mark, &cached_state)) {
 		bool wait_writeback = false;

@@ -975,17 +972,16 @@ int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info,
 			wait_writeback = true;
 		}
 		if (!err)
-			err = filemap_fdatawrite_range(mapping, start, end);
+			err = btree_write_range(fs_info, start, end);
 		if (err)
 			werr = err;
 		else if (wait_writeback)
-			werr = filemap_fdatawait_range(mapping, start, end);
+			werr = btree_wait_range(fs_info, start, end);
 		free_extent_state(cached_state);
 		cached_state = NULL;
 		cond_resched();
 		start = end + 1;
 	}
-	atomic_dec(&BTRFS_I(fs_info->btree_inode)->sync_writers);
 	return werr;
 }
 

@@ -1000,7 +996,6 @@ static int __btrfs_wait_marked_extents(struct btrfs_fs_info *fs_info,
 {
 	int err = 0;
 	int werr = 0;
-	struct address_space *mapping = fs_info->btree_inode->i_mapping;
 	struct extent_state *cached_state = NULL;
 	u64 start = 0;
 	u64 end;

@@ -1021,7 +1016,7 @@ static int __btrfs_wait_marked_extents(struct btrfs_fs_info *fs_info,
 		if (err == -ENOMEM)
 			err = 0;
 		if (!err)
-			err = filemap_fdatawait_range(mapping, start, end);
+			err = btree_wait_range(fs_info, start, end);
 		if (err)
 			werr = err;
 		free_extent_state(cached_state);

-- 
2.7.5

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