Merge "[DO NOT MERGE] Use FUSE_SHORTCIRCUIT if available" into nyc-mr1-dev

sdcard/sdcard.c

@@ -1221,7 +1221,13 @@ static int handle_open(struct fuse* fuse, struct fuse_handler* handler,
     }
     out.fh = ptr_to_id(h);
     out.open_flags = 0;
+
+#ifdef FUSE_SHORTCIRCUIT
+    out.lower_fd = h->fd;
+#else
     out.padding = 0;
+#endif
+
     fuse_reply(fuse, hdr->unique, &out, sizeof(out));
     return NO_STATUS;
 }
@@ -1385,7 +1391,13 @@ static int handle_opendir(struct fuse* fuse, struct fuse_handler* handler,
     }
     out.fh = ptr_to_id(h);
     out.open_flags = 0;
+
+#ifdef FUSE_SHORTCIRCUIT
+    out.lower_fd = -1;
+#else
     out.padding = 0;
+#endif
+
     fuse_reply(fuse, hdr->unique, &out, sizeof(out));
     return NO_STATUS;
 }
@@ -1467,6 +1479,11 @@ static int handle_init(struct fuse* fuse, struct fuse_handler* handler,
     out.major = FUSE_KERNEL_VERSION;
     out.max_readahead = req->max_readahead;
     out.flags = FUSE_ATOMIC_O_TRUNC | FUSE_BIG_WRITES;
+
+#ifdef FUSE_SHORTCIRCUIT
+    out.flags |= FUSE_SHORTCIRCUIT;
+#endif
+
     out.max_background = 32;
     out.congestion_threshold = 32;
     out.max_write = MAX_WRITE;