From 0f3dc1e84a717210c5de43201a0c64ef099cc49d Mon Sep 17 00:00:00 2001
From: Jakub Sztandera <kubuxu@protonmail.ch>
Date: Fri, 24 Jun 2016 22:10:31 +0200
Subject: [PATCH] core: Add config option for datastore read rehashing

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>
---
 core/builder.go          | 16 +++++++++++-----
 repo/config/datastore.go |  5 +++--
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/core/builder.go b/core/builder.go
index c17d6ff6e..0d21f5b20 100644
--- a/core/builder.go
+++ b/core/builder.go
@@ -130,16 +130,22 @@ func setupNode(ctx context.Context, n *IpfsNode, cfg *BuildCfg) error {
 	}
 
 	var err error
-	n.Blockstore, err = bstore.WriteCached(bstore.NewBlockstore(n.Repo.Datastore()), kSizeBlockstoreWriteCache)
+	bs := bstore.NewBlockstore(n.Repo.Datastore())
+	n.Blockstore, err = bstore.WriteCached(bs, kSizeBlockstoreWriteCache)
 	if err != nil {
 		return err
 	}
 
+	rcfg, err := n.Repo.Config()
+	if err != nil {
+		return err
+	}
+
+	if rcfg.Datastore.HashOnRead {
+		bs.RuntimeHashing(true)
+	}
+
 	if cfg.Online {
-		rcfg, err := n.Repo.Config()
-		if err != nil {
-			return err
-		}
 		do := setupDiscoveryOption(rcfg.Discovery)
 		if err := n.startOnlineServices(ctx, cfg.Routing, cfg.Host, do); err != nil {
 			return err
diff --git a/repo/config/datastore.go b/repo/config/datastore.go
index 52582bd5c..2b9bf600d 100644
--- a/repo/config/datastore.go
+++ b/repo/config/datastore.go
@@ -15,8 +15,9 @@ type Datastore struct {
 	StorageGCWatermark int64  // in percentage to multiply on StorageMax
 	GCPeriod           string // in ns, us, ms, s, m, h
 
-	Params *json.RawMessage
-	NoSync bool
+	Params     *json.RawMessage
+	NoSync     bool
+	HashOnRead bool
 }
 
 func (d *Datastore) ParamData() []byte {