os/bluestore/BlueFS: simplify extent list

Merge contiguous extents.

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/src/os/bluestore/BlueFS.cc b/src/os/bluestore/BlueFS.cc
index bda920b7e1f37eb779f6a23d1cfbf90bff55fac5..0321812d648cfc430873a2d1dc8f2a9f7cbeba3d 100644 (file)
--- a/src/os/bluestore/BlueFS.cc
+++ b/src/os/bluestore/BlueFS.cc
@@ -888,7 +888,10 @@ int BlueFS::_allocate(unsigned id, uint64_t len, vector<bluefs_extent_t> *ev)
                                &e.offset, &e.length);
     if (r < 0)
       return r;
-    ev->push_back(e);
+    if (!ev->empty() && ev->back().end() == e.offset)
+      ev->back().length += e.length;
+    else
+      ev->push_back(e);
     if (e.length >= left)
       break;
     left -= e.length;