From e8dd0883c1b48f328c78fb5ebfa02318a84b31bf Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@redhat.com>
Date: Tue, 27 Sep 2016 14:02:36 -0400
Subject: [PATCH] os/bluestore: add assert to compress_extent_map

Signed-off-by: Sage Weil <sage@redhat.com>
---
 src/os/bluestore/BlueStore.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index 923bda285c263..f59159d2c73db 100644
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -1888,6 +1888,8 @@ int BlueStore::ExtentMap::compress_extent_map(uint64_t offset, uint64_t length)
   if (p != extent_map.begin()) {
     --p;  // start to the left of offset
   }
+  // the caller should have just written to this region
+  assert(p != extent_map.end());
 
   // identify the *next* shard
   auto pshard = shards.begin();
-- 
2.39.5