From faecfac2fa90c14f8d4cd1d3a1b478dcc81df318 Mon Sep 17 00:00:00 2001
From: Shubheksha Jalan <jshubheksha@gmail.com>
Date: Thu, 11 Jan 2018 14:06:49 +0530
Subject: [PATCH] update docs, rename docs folder, add error condition

---
 {Documentation => docs}/format/chunks.md     | 0
 {Documentation => docs}/format/index.md      | 2 +-
 {Documentation => docs}/format/tombstones.md | 0
 index/index.go                               | 8 ++++----
 4 files changed, 5 insertions(+), 5 deletions(-)
 rename {Documentation => docs}/format/chunks.md (100%)
 rename {Documentation => docs}/format/index.md (98%)
 rename {Documentation => docs}/format/tombstones.md (100%)

diff --git a/Documentation/format/chunks.md b/docs/format/chunks.md
similarity index 100%
rename from Documentation/format/chunks.md
rename to docs/format/chunks.md
diff --git a/Documentation/format/index.md b/docs/format/index.md
similarity index 98%
rename from Documentation/format/index.md
rename to docs/format/index.md
index ce37999078..48366ef8dd 100644
--- a/Documentation/format/index.md
+++ b/docs/format/index.md
@@ -65,7 +65,7 @@ Strings are referenced by pointing to the beginning of their length field. The s
 ### Series
 
 The section contains a sequence of series that hold the label set of the series as well as its chunks within the block. The series are sorted lexicographically by their label sets.  
-The file offset to the beginning of a series serves as the series' ID in all subsequent references. Thereby, a sorted list of series IDs implies a lexicographically sorted list of series label sets.
+Each series section is aligned to 16 bytes. The ID for a series is the `offset/16`. This serves as the series' ID in all subsequent references. Thereby, a sorted list of series IDs implies a lexicographically sorted list of series label sets. 
 
 ```
 ┌───────────────────────────────────────┐
diff --git a/Documentation/format/tombstones.md b/docs/format/tombstones.md
similarity index 100%
rename from Documentation/format/tombstones.md
rename to docs/format/tombstones.md
diff --git a/index/index.go b/index/index.go
index f49b9236ec..98ddb8da80 100644
--- a/index/index.go
+++ b/index/index.go
@@ -575,12 +575,12 @@ func NewReader(b ByteSlice, version int) (*Reader, error) {
 	return newReader(b, nil, version)
 }
 
-func NewReaderV1(b ByteSlice, c io.Closer, version int) (*Reader, error) {
-	return newReader(b, c, version)
-}
-
 // NewFileReader returns a new index reader against the given index file.
 func NewFileReader(path string, version int) (*Reader, error) {
+	if version != 1 && version != 2 {
+		return nil, errors.Errorf("unexpected file version %d", version)
+
+	}
 	f, err := fileutil.OpenMmapFile(path)
 	if err != nil {
 		return nil, err