diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 3878772..5accced 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -594,6 +594,7 @@
 	tree_root->nodesize = nodesize;
 	tree_root->leafsize = leafsize;
 	tree_root->sectorsize = sectorsize;
+	sb_set_blocksize(sb, sectorsize);
 
 	i_size_write(fs_info->btree_inode,
 		     btrfs_super_total_bytes(disk_super));
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 190b07b..33d2ccf 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -58,4 +58,6 @@
 int btrfs_clear_buffer_defrag(struct extent_buffer *buf);
 int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf);
 int btrfs_read_buffer(struct extent_buffer *buf);
+u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
+void btrfs_csum_final(u32 crc, char *result);
 #endif
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 2a8bc4b..e87e476 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -2031,6 +2031,7 @@
 		i = 1;
 		index++;
 		page_cache_get(page0);
+		mark_page_accessed(page0);
 		set_page_extent_mapped(page0);
 		set_page_private(page0, EXTENT_PAGE_PRIVATE_FIRST_PAGE |
 				 len << 2);
@@ -2049,6 +2050,7 @@
 			goto fail;
 		}
 		set_page_extent_mapped(p);
+		mark_page_accessed(p);
 		if (i == 0) {
 			eb->first_page = p;
 			set_page_private(p, EXTENT_PAGE_PRIVATE_FIRST_PAGE |
@@ -2099,6 +2101,7 @@
 			goto fail;
 		}
 		set_page_extent_mapped(p);
+		mark_page_accessed(p);
 
 		if (i == 0) {
 			eb->first_page = p;
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 9a65e97..10a4c74 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -136,27 +136,27 @@
 			  u64 objectid, u64 offset,
 			  char *data, size_t len)
 {
-	return 0;
-#if 0
 	int ret;
 	struct btrfs_key file_key;
 	struct btrfs_key found_key;
 	struct btrfs_path *path;
 	struct btrfs_csum_item *item;
-	struct extent_buffer *leaf;
+	struct extent_buffer *leaf = NULL;
 	u64 csum_offset;
+	u32 csum_result = ~(u32)0;
 
 	path = btrfs_alloc_path();
 	BUG_ON(!path);
 
 	file_key.objectid = objectid;
 	file_key.offset = offset;
-	file_key.flags = 0;
 	btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
 
 	item = btrfs_lookup_csum(trans, root, path, objectid, offset, 1);
-	if (!IS_ERR(item))
+	if (!IS_ERR(item)) {
+		leaf = path->nodes[0];
 		goto found;
+	}
 	ret = PTR_ERR(item);
 	if (ret == -EFBIG) {
 		u32 item_size;
@@ -226,14 +226,15 @@
 	item = (struct btrfs_csum_item *)((unsigned char *)item +
 					  csum_offset * BTRFS_CRC32_SIZE);
 found:
-	/* FIXME!!!!!!!!!!!! */
-	ret = btrfs_csum_data(root, data, len, &item->csum);
+	csum_result = btrfs_csum_data(root, data, csum_result, len);
+	btrfs_csum_final(csum_result, (char *)&csum_result);
+	write_extent_buffer(leaf, &csum_result, (unsigned long)item,
+			    BTRFS_CRC32_SIZE);
 	btrfs_mark_buffer_dirty(path->nodes[0]);
 fail:
 	btrfs_release_path(root, path);
 	btrfs_free_path(path);
 	return ret;
-#endif
 }
 
 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index fe28404..1af2b65 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -289,6 +289,7 @@
 	 */
 	inline_size = end_pos;
 	if (isize >= BTRFS_MAX_INLINE_DATA_SIZE(root) ||
+	    inline_size > 16384 ||
 	    inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
 		u64 last_end;
 
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 80f84b4..ac69f69 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -135,7 +135,7 @@
 	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
 	struct btrfs_csum_item *item;
 	struct btrfs_path *path = NULL;
-	u64 private;
+	u32 csum;
 
 	mutex_lock(&root->fs_info->fs_mutex);
 	path = btrfs_alloc_path();
@@ -145,11 +145,12 @@
 		/* a csum that isn't present is a preallocated region. */
 		if (ret == -ENOENT || ret == -EFBIG)
 			ret = 0;
-		private = 0;
+		csum = 0;
 		goto out;
 	}
-	memcpy((char *)&private, &item->csum, BTRFS_CRC32_SIZE);
-	set_state_private(em_tree, start, private);
+	read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
+			   BTRFS_CRC32_SIZE);
+	set_state_private(em_tree, start, csum);
 out:
 	if (path)
 		btrfs_free_path(path);
@@ -165,21 +166,19 @@
 	char *kaddr;
 	u64 private;
 	int ret;
+	struct btrfs_root *root = BTRFS_I(inode)->root;
+	u32 csum = ~(u32)0;
 
 	ret = get_state_private(em_tree, start, &private);
 	kaddr = kmap_atomic(page, KM_IRQ0);
 	if (ret) {
 		goto zeroit;
 	}
-	/*
-	struct btrfs_root *root = BTRFS_I(inode)->root;
-	char csum[BTRFS_CRC32_SIZE];
-	ret = btrfs_csum_data(root, kaddr + offset, end - start + 1, csum);
-	BUG_ON(ret);
-	if (memcmp(csum, &private, BTRFS_CRC32_SIZE)) {
+	csum = btrfs_csum_data(root, kaddr + offset, csum,  end - start + 1);
+	btrfs_csum_final(csum, (char *)&csum);
+	if (csum != private) {
 		goto zeroit;
 	}
-	*/
 	kunmap_atomic(kaddr, KM_IRQ0);
 	return 0;