diff --git a/src/os/bluestore/BlueFS.cc b/src/os/bluestore/BlueFS.cc
index 29e6217a5cc..77b2c5c0768 100644
--- a/src/os/bluestore/BlueFS.cc
+++ b/src/os/bluestore/BlueFS.cc
@@ -570,12 +570,15 @@ int BlueFS::_replay(bool noop, bool to_stdout)
   log_seq = 0;
 
   FileRef log_file;
-  if (noop) {
-    log_file = new File;
+  log_file = _get_file(1);
+  if (!noop) {
+    log_file->fnode = super.log_fnode;
   } else {
-    log_file = _get_file(1);
+    // do not use fnode from superblock in 'noop' mode - log_file's one should
+    // be fine and up-to-date
+    assert(log_file->fnode.ino == 1);
+    assert(log_file->fnode.extents.size() != 0);
   }
-  log_file->fnode = super.log_fnode;
   dout(10) << __func__ << " log_fnode " << super.log_fnode << dendl;
   if (unlikely(to_stdout)) {
     std::cout << " log_fnode " << super.log_fnode << std::endl;
@@ -950,19 +953,10 @@ int BlueFS::_replay(bool noop, bool to_stdout)
   return 0;
 }
 
-int BlueFS::log_dump(
-  CephContext *cct,
-  const string& path,
-  const vector<string>& devs)
+int BlueFS::log_dump()
 {
-  int r = _open_super();
-  if (r < 0) {
-    derr << __func__ << " failed to open super: " << cpp_strerror(r) << dendl;
-    return r;
-  }
-
   // only dump log file's content
-  r = _replay(true, true);
+  int r = _replay(true, true);
   if (r < 0) {
     derr << __func__ << " failed to replay log: " << cpp_strerror(r) << dendl;
     return r;
diff --git a/src/os/bluestore/BlueFS.h b/src/os/bluestore/BlueFS.h
index 5e147a8cc5c..4abacb672b8 100644
--- a/src/os/bluestore/BlueFS.h
+++ b/src/os/bluestore/BlueFS.h
@@ -340,10 +340,7 @@ public:
   int mount();
   void umount();
   
-  int log_dump(
-    CephContext *cct,
-    const string& path,
-    const vector<string>& devs);
+  int log_dump();
 
   void collect_metadata(map<string,string> *pm, unsigned skip_bdev_id);
   void get_devices(set<string> *ls);
diff --git a/src/os/bluestore/bluefs_types.cc b/src/os/bluestore/bluefs_types.cc
index a237eab5589..d1f5edf173c 100644
--- a/src/os/bluestore/bluefs_types.cc
+++ b/src/os/bluestore/bluefs_types.cc
@@ -25,7 +25,7 @@ void bluefs_extent_t::generate_test_instances(list<bluefs_extent_t*>& ls)
 
 ostream& operator<<(ostream& out, const bluefs_extent_t& e)
 {
-  return out << (int)e.bdev << ":0x" << std::hex << e.offset << "+" << e.length
+  return out << (int)e.bdev << ":0x" << std::hex << e.offset << "~" << e.length
 	     << std::dec;
 }
 
diff --git a/src/os/bluestore/bluestore_tool.cc b/src/os/bluestore/bluestore_tool.cc
index b756812ed23..b3209fbaf0d 100644
--- a/src/os/bluestore/bluestore_tool.cc
+++ b/src/os/bluestore/bluestore_tool.cc
@@ -134,26 +134,6 @@ void add_devices(
   }
 }
 
-void log_dump(
-  CephContext *cct,
-  const string& path,
-  const vector<string>& devs)
-{
-  validate_path(cct, path, true);
-  BlueFS *fs = new BlueFS(cct);
-  
-  add_devices(fs, cct, devs);
-
-  int r = fs->log_dump(cct, path, devs);
-  if (r < 0) {
-    cerr << "log_dump failed" << ": "
-         << cpp_strerror(r) << std::endl;
-    exit(EXIT_FAILURE);
-  }
-
-  delete fs;
-}
-
 BlueFS *open_bluefs(
   CephContext *cct,
   const string& path,
@@ -173,6 +153,22 @@ BlueFS *open_bluefs(
   return fs;
 }
 
+void log_dump(
+  CephContext *cct,
+  const string& path,
+  const vector<string>& devs)
+{
+  BlueFS* fs = open_bluefs(cct, path, devs);
+  int r = fs->log_dump();
+  if (r < 0) {
+    cerr << "log_dump failed" << ": "
+         << cpp_strerror(r) << std::endl;
+    exit(EXIT_FAILURE);
+  }
+
+  delete fs;
+}
+
 void inferring_bluefs_devices(vector<string>& devs, std::string& path)
 {
   cout << "inferring bluefs devices from bluestore path" << std::endl;
@@ -333,8 +329,12 @@ int main(int argc, char **argv)
     if (r < 0) {
       cerr << "error from fsck: " << cpp_strerror(r) << std::endl;
       exit(EXIT_FAILURE);
+    } else if (r > 0) {
+      cerr << action << " found " << r << " error(s)" << std::endl;
+      exit(EXIT_FAILURE);
+    } else {
+      cout << action << " success" << std::endl;
     }
-    cout << action << " success" << std::endl;
   }
   else if (action == "prime-osd-dir") {
     bluestore_bdev_label_t label;