Save root file descriptor when starting up

Allow access to underlying file system by saving a file descriptor to
the underlying directory when starting.  Close the FD during FUSE’s
destroy routine, though it won’t matter much.

1 files changed, 9 insertions, 1 deletions

diff --git a/src/operations.cc b/src/operations.cc
index abd2f0c..d22a1e2 100644
--- a/src/operations.cc
+++ b/src/operations.cc
@@ -33,10 +33,14 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include "utility.h"
+
 namespace scoville {
 
 namespace {
 
+int root_fd_;
+
 struct Directory {
   DIR* fd;
   dirent* entry;
@@ -75,6 +79,8 @@ void* Initialize(fuse_conn_info*) {
 
 void Destroy(void*) {
   LOG(INFO) << "destroy";
+  LOG_IF(ERROR, close(root_fd_) == -1) << "could not close root FD: "
+                                       << ErrnoText();
 }
 
 int Getattr(const char* const path, struct stat* output) {
@@ -153,7 +159,9 @@ int Releasedir(const char*, fuse_file_info* const file_info) {
 
 }  // namespace
 
-fuse_operations FuseOperations() {
+fuse_operations FuseOperations(const int root_fd) {
+  root_fd_ = root_fd;
+
   fuse_operations result;
 
   result.flag_nullpath_ok = true;