osd/ReplicatedPG: For WRITEFULL replica object, only truncate if new

size less than old size(only truncate to new size)

If new size larger or equal old size, no need do truncate.
It can diretcly overwrite.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>

diff --git a/src/osd/ReplicatedPG.cc b/src/osd/ReplicatedPG.cc
index bcaa72e972dcc2781ed1608a5895091aa9d1ac97..da47fe0a7dd3c06d991f98b0c2289f8506e643f2 100644 (file)
--- a/src/osd/ReplicatedPG.cc
+++ b/src/osd/ReplicatedPG.cc
@@ -4267,10 +4267,10 @@ int ReplicatedPG::do_osd_ops(OpContext *ctx, vector<OSDOp>& ops)
          }
        } else {
          ctx->mod_desc.mark_unrollbackable();
-         if (obs.exists) {
-           t->truncate(soid, 0);
-         }
          t->write(soid, op.extent.offset, op.extent.length, osd_op.indata, op.flags);
+         if (obs.exists && op.extent.length < oi.size) {
+           t->truncate(soid, op.extent.length);
+         }
        }
        maybe_create_new_object(ctx);
        obs.oi.set_data_digest(osd_op.indata.crc32c(-1));