diff --git a/include/crucible/btrfs-tree.h b/include/crucible/btrfs-tree.h
index b4d14a1..dddb55d 100644
--- a/include/crucible/btrfs-tree.h
+++ b/include/crucible/btrfs-tree.h
@@ -173,30 +173,27 @@ namespace crucible {
 		void get_sums(uint64_t logical, size_t count, function<void(uint64_t logical, const uint8_t *buf, size_t count)> output);
 	};
 
-	/// Fetch extent items from extent tree
+	/// Fetch extent items from extent tree.
+	/// Does not filter out metadata!  See BtrfsDataExtentTreeFetcher for that.
 	class BtrfsExtentItemFetcher : public BtrfsTreeObjectFetcher {
 	public:
 		BtrfsExtentItemFetcher(const Fd &fd);
 	};
 
-	/// Fetch extent refs from an inode
+	/// Fetch extent refs from an inode.  Caller must set the tree and objectid.
 	class BtrfsExtentDataFetcher : public BtrfsTreeOffsetFetcher {
 	public:
 		BtrfsExtentDataFetcher(const Fd &fd);
 	};
 
-	/// Fetch inodes from a subvol
-	class BtrfsFsTreeFetcher : public BtrfsTreeObjectFetcher {
-	public:
-		BtrfsFsTreeFetcher(const Fd &fd, uint64_t subvol);
-	};
-
+	/// Fetch raw inode items
 	class BtrfsInodeFetcher : public BtrfsTreeObjectFetcher {
 	public:
 		BtrfsInodeFetcher(const Fd &fd);
 		BtrfsTreeItem stat(uint64_t subvol, uint64_t inode);
 	};
 
+	/// Fetch a root (subvol) item
 	class BtrfsRootFetcher : public BtrfsTreeObjectFetcher {
 	public:
 		BtrfsRootFetcher(const Fd &fd);
diff --git a/lib/btrfs-tree.cc b/lib/btrfs-tree.cc
index ed91f0a..a20919e 100644
--- a/lib/btrfs-tree.cc
+++ b/lib/btrfs-tree.cc
@@ -662,14 +662,6 @@ namespace crucible {
 		type(BTRFS_EXTENT_DATA_KEY);
 	}
 
-	BtrfsFsTreeFetcher::BtrfsFsTreeFetcher(const Fd &new_fd, uint64_t subvol) :
-		BtrfsTreeObjectFetcher(new_fd)
-	{
-		tree(subvol);
-		type(BTRFS_EXTENT_DATA_KEY);
-		scale_size(1);
-	}
-
 	BtrfsInodeFetcher::BtrfsInodeFetcher(const Fd &fd) :
 		BtrfsTreeObjectFetcher(fd)
 	{