From 59a5b5ab5daa588c3d17e3e01a0f4662749c4da6 Mon Sep 17 00:00:00 2001
From: Anthony Romano <anthony.romano@coreos.com>
Date: Mon, 7 Aug 2017 19:42:27 -0700
Subject: [PATCH] fix NoSyncFreelist reachability checking

* rescan freelist if valid but given NoSyncFreelist to
  include the freelist as free pageas.

* only treat free list as reachable if set to valid pgid

Fixes #9
---
 db.go | 2 +-
 tx.go | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/db.go b/db.go
index c9d800fc..cefc3233 100644
--- a/db.go
+++ b/db.go
@@ -242,7 +242,7 @@ func Open(path string, mode os.FileMode, options *Options) (*DB, error) {
 	}
 
 	db.freelist = newFreelist()
-	noFreeList := db.meta().freelist == pgidNoFreelist
+	noFreeList := db.meta().freelist == pgidNoFreelist || db.NoFreelistSync
 	if noFreeList {
 		// Reconstruct free list by scanning the DB.
 		db.freelist.readIDs(db.freepages())
diff --git a/tx.go b/tx.go
index fa1fa509..6615dfcb 100644
--- a/tx.go
+++ b/tx.go
@@ -408,7 +408,7 @@ func (tx *Tx) check(ch chan error) {
 	reachable := make(map[pgid]*page)
 	reachable[0] = tx.page(0) // meta0
 	reachable[1] = tx.page(1) // meta1
-	if !tx.DB().NoFreelistSync {
+	if tx.meta.freelist != pgidNoFreelist {
 		for i := uint32(0); i <= tx.page(tx.meta.freelist).overflow; i++ {
 			reachable[tx.meta.freelist+pgid(i)] = tx.page(tx.meta.freelist)
 		}