os/bluestore: fix _do_read return value

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

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index 451ffaf65f40677cdbd330b42cd7490e5fc3361e..661d3906f4a0122834ac9cab3b1a525e6c08a998 100644 (file)
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -1787,6 +1787,7 @@ int BlueStore::_do_read(
        if (r < 0) {
          goto out;
        }
+       r = r_len;
        bufferlist u;
        u.substr_of(t, front_extra, x_len);
        bl.claim_append(u);