block/raw-posix: Only sync after successful preallocation

The loop which filled the file with zeroes may have been left early due
to an error. In that case, the fsync() should be skipped.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/block/raw-posix.c b/block/raw-posix.c
index e0e48c5f51d54f72295080aa1ea8ba51daa5613b..d106fc456b842c9cd04aa9388df25b5654e84633 100644 (file)
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1453,7 +1453,9 @@ static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
             }
             left -= result;
         }
-        fsync(fd);
+        if (result >= 0) {
+            fsync(fd);
+        }
         g_free(buf);
         break;
     }