From 3c8c882c31e990478c8b6260debccdfb3b0b11a7 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@redhat.com>
Date: Wed, 22 Jun 2016 10:28:28 -0400
Subject: [PATCH] include/small_encoding: fix lba encoding with many low zeros

Signed-off-by: Sage Weil <sage@redhat.com>
---
 src/include/small_encoding.h | 1 +
 src/test/encoding.cc         | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/src/include/small_encoding.h b/src/include/small_encoding.h
index 5efca0cfb2bf..e07afaf381e0 100644
--- a/src/include/small_encoding.h
+++ b/src/include/small_encoding.h
@@ -183,6 +183,7 @@ inline void small_encode_lba(uint64_t v, bufferlist& bl) {
     pos = t + 1;
     word = (1 << t) - 1;
   } else {
+    v >>= 20;
     pos = 3;
     word = 0x3;
   }
diff --git a/src/test/encoding.cc b/src/test/encoding.cc
index 5469c42109ac..b9b13f73d9dc 100644
--- a/src/test/encoding.cc
+++ b/src/test/encoding.cc
@@ -320,6 +320,7 @@ TEST(small_encoding, varint_lowz) {
     {0x7f0000, 2, 2, 2},
     {0xffff0000, 4, 4, 4},
     {0xffffffff, 5, 5, 5},
+    {0x41000000, 3, 4, 4},
     {0, 0, 0, 0}
   };
   for (unsigned i=0; v[i][1]; ++i) {
@@ -382,6 +383,7 @@ TEST(small_encoding, lba) {
     {0x3fffffff0000, 5},
     {0xfffffff00000, 4},
     {0x1fffffff00000, 5},
+    {0x41000000, 4},
     {0, 0}
   };
   for (unsigned i=0; v[i][1]; ++i) {
-- 
2.47.3