性能测试用例和结果更新

src/hook/zvfs_hook_fd.c

@@ -207,12 +207,37 @@ zvfs_open_impl(int real_fd, const char *abspath, int flags, mode_t mode)
     struct zvfs_inode *inode = NULL;
     uint64_t blob_id = 0;
     uint64_t handle_id = 0;
+    int create_new = 0;
 
     zvfs_debug_open_log(abspath, NULL,
                         "open_impl enter real_fd=%d path=%s flags=0x%x mode=%#o",
                         real_fd, zvfs_dbg_str(abspath), flags, (unsigned)mode);
 
     if (flags & O_CREAT) {
+        /*
+         * O_CREAT does not imply the file is newly created.
+         * fio, for example, may open an existing file with O_CREAT again
+         * during the worker phase. Only create a new blob when the backing
+         * file does not already carry a ZVFS blob_id xattr.
+         */
+        if (zvfs_xattr_read_blob_id(real_fd, &blob_id) == 0) {
+            create_new = 0;
+        } else if (errno == ENODATA
+#ifdef ENOATTR
+                   || errno == ENOATTR
+#endif
+        ) {
+            create_new = 1;
+            blob_id = 0;
+        } else {
+            zvfs_debug_open_log(abspath, NULL,
+                                "open_impl xattr probe fail errno=%d(%s)",
+                                errno, strerror(errno));
+            goto fail;
+        }
+    }
+
+    if (create_new) {
         /* ---- 创建路径 -------------------------------------------- */
 
         /* 1. 创建 blob */